1 /* Common target dependent code for GDB on ARM systems.
3 Copyright (C) 1988-2016 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include <ctype.h> /* XXX for isupper (). */
29 #include "dis-asm.h" /* For register styles. */
31 #include "reggroups.h"
34 #include "arch-utils.h"
36 #include "frame-unwind.h"
37 #include "frame-base.h"
38 #include "trad-frame.h"
40 #include "dwarf2-frame.h"
42 #include "prologue-value.h"
44 #include "target-descriptions.h"
45 #include "user-regs.h"
49 #include "arch/arm-get-next-pcs.h"
51 #include "gdb/sim-arm.h"
54 #include "coff/internal.h"
60 #include "record-full.h"
63 #include "features/arm/arm-with-m.c"
64 #include "features/arm/arm-with-m-fpa-layout.c"
65 #include "features/arm/arm-with-m-vfp-d16.c"
66 #include "features/arm/arm-with-iwmmxt.c"
67 #include "features/arm/arm-with-vfpv2.c"
68 #include "features/arm/arm-with-vfpv3.c"
69 #include "features/arm/arm-with-neon.c"
73 /* Macros for setting and testing a bit in a minimal symbol that marks
74 it as Thumb function. The MSB of the minimal symbol's "info" field
75 is used for this purpose.
77 MSYMBOL_SET_SPECIAL Actually sets the "special" bit.
78 MSYMBOL_IS_SPECIAL Tests the "special" bit in a minimal symbol. */
80 #define MSYMBOL_SET_SPECIAL(msym) \
81 MSYMBOL_TARGET_FLAG_1 (msym) = 1
83 #define MSYMBOL_IS_SPECIAL(msym) \
84 MSYMBOL_TARGET_FLAG_1 (msym)
86 /* Per-objfile data used for mapping symbols. */
87 static const struct objfile_data
*arm_objfile_data_key
;
89 struct arm_mapping_symbol
94 typedef struct arm_mapping_symbol arm_mapping_symbol_s
;
95 DEF_VEC_O(arm_mapping_symbol_s
);
97 struct arm_per_objfile
99 VEC(arm_mapping_symbol_s
) **section_maps
;
102 /* The list of available "set arm ..." and "show arm ..." commands. */
103 static struct cmd_list_element
*setarmcmdlist
= NULL
;
104 static struct cmd_list_element
*showarmcmdlist
= NULL
;
106 /* The type of floating-point to use. Keep this in sync with enum
107 arm_float_model, and the help string in _initialize_arm_tdep. */
108 static const char *const fp_model_strings
[] =
118 /* A variable that can be configured by the user. */
119 static enum arm_float_model arm_fp_model
= ARM_FLOAT_AUTO
;
120 static const char *current_fp_model
= "auto";
122 /* The ABI to use. Keep this in sync with arm_abi_kind. */
123 static const char *const arm_abi_strings
[] =
131 /* A variable that can be configured by the user. */
132 static enum arm_abi_kind arm_abi_global
= ARM_ABI_AUTO
;
133 static const char *arm_abi_string
= "auto";
135 /* The execution mode to assume. */
136 static const char *const arm_mode_strings
[] =
144 static const char *arm_fallback_mode_string
= "auto";
145 static const char *arm_force_mode_string
= "auto";
147 /* Number of different reg name sets (options). */
148 static int num_disassembly_options
;
150 /* The standard register names, and all the valid aliases for them. Note
151 that `fp', `sp' and `pc' are not added in this alias list, because they
152 have been added as builtin user registers in
153 std-regs.c:_initialize_frame_reg. */
158 } arm_register_aliases
[] = {
159 /* Basic register numbers. */
176 /* Synonyms (argument and variable registers). */
189 /* Other platform-specific names for r9. */
195 /* Names used by GCC (not listed in the ARM EABI). */
197 /* A special name from the older ATPCS. */
201 static const char *const arm_register_names
[] =
202 {"r0", "r1", "r2", "r3", /* 0 1 2 3 */
203 "r4", "r5", "r6", "r7", /* 4 5 6 7 */
204 "r8", "r9", "r10", "r11", /* 8 9 10 11 */
205 "r12", "sp", "lr", "pc", /* 12 13 14 15 */
206 "f0", "f1", "f2", "f3", /* 16 17 18 19 */
207 "f4", "f5", "f6", "f7", /* 20 21 22 23 */
208 "fps", "cpsr" }; /* 24 25 */
210 /* Valid register name styles. */
211 static const char **valid_disassembly_styles
;
213 /* Disassembly style to use. Default to "std" register names. */
214 static const char *disassembly_style
;
216 /* This is used to keep the bfd arch_info in sync with the disassembly
218 static void set_disassembly_style_sfunc(char *, int,
219 struct cmd_list_element
*);
220 static void set_disassembly_style (void);
222 static void convert_from_extended (const struct floatformat
*, const void *,
224 static void convert_to_extended (const struct floatformat
*, void *,
227 static enum register_status
arm_neon_quad_read (struct gdbarch
*gdbarch
,
228 struct regcache
*regcache
,
229 int regnum
, gdb_byte
*buf
);
230 static void arm_neon_quad_write (struct gdbarch
*gdbarch
,
231 struct regcache
*regcache
,
232 int regnum
, const gdb_byte
*buf
);
235 arm_get_next_pcs_syscall_next_pc (struct arm_get_next_pcs
*self
);
238 /* get_next_pcs operations. */
239 static struct arm_get_next_pcs_ops arm_get_next_pcs_ops
= {
240 arm_get_next_pcs_read_memory_unsigned_integer
,
241 arm_get_next_pcs_syscall_next_pc
,
242 arm_get_next_pcs_addr_bits_remove
,
243 arm_get_next_pcs_is_thumb
,
247 struct arm_prologue_cache
249 /* The stack pointer at the time this frame was created; i.e. the
250 caller's stack pointer when this function was called. It is used
251 to identify this frame. */
254 /* The frame base for this frame is just prev_sp - frame size.
255 FRAMESIZE is the distance from the frame pointer to the
256 initial stack pointer. */
260 /* The register used to hold the frame pointer for this frame. */
263 /* Saved register offsets. */
264 struct trad_frame_saved_reg
*saved_regs
;
267 static CORE_ADDR
arm_analyze_prologue (struct gdbarch
*gdbarch
,
268 CORE_ADDR prologue_start
,
269 CORE_ADDR prologue_end
,
270 struct arm_prologue_cache
*cache
);
272 /* Architecture version for displaced stepping. This effects the behaviour of
273 certain instructions, and really should not be hard-wired. */
275 #define DISPLACED_STEPPING_ARCH_VERSION 5
277 /* Set to true if the 32-bit mode is in use. */
281 /* Return the bit mask in ARM_PS_REGNUM that indicates Thumb mode. */
284 arm_psr_thumb_bit (struct gdbarch
*gdbarch
)
286 if (gdbarch_tdep (gdbarch
)->is_m
)
292 /* Determine if the processor is currently executing in Thumb mode. */
295 arm_is_thumb (struct regcache
*regcache
)
298 ULONGEST t_bit
= arm_psr_thumb_bit (get_regcache_arch (regcache
));
300 cpsr
= regcache_raw_get_unsigned (regcache
, ARM_PS_REGNUM
);
302 return (cpsr
& t_bit
) != 0;
305 /* Determine if FRAME is executing in Thumb mode. */
308 arm_frame_is_thumb (struct frame_info
*frame
)
311 ULONGEST t_bit
= arm_psr_thumb_bit (get_frame_arch (frame
));
313 /* Every ARM frame unwinder can unwind the T bit of the CPSR, either
314 directly (from a signal frame or dummy frame) or by interpreting
315 the saved LR (from a prologue or DWARF frame). So consult it and
316 trust the unwinders. */
317 cpsr
= get_frame_register_unsigned (frame
, ARM_PS_REGNUM
);
319 return (cpsr
& t_bit
) != 0;
322 /* Callback for VEC_lower_bound. */
325 arm_compare_mapping_symbols (const struct arm_mapping_symbol
*lhs
,
326 const struct arm_mapping_symbol
*rhs
)
328 return lhs
->value
< rhs
->value
;
331 /* Search for the mapping symbol covering MEMADDR. If one is found,
332 return its type. Otherwise, return 0. If START is non-NULL,
333 set *START to the location of the mapping symbol. */
336 arm_find_mapping_symbol (CORE_ADDR memaddr
, CORE_ADDR
*start
)
338 struct obj_section
*sec
;
340 /* If there are mapping symbols, consult them. */
341 sec
= find_pc_section (memaddr
);
344 struct arm_per_objfile
*data
;
345 VEC(arm_mapping_symbol_s
) *map
;
346 struct arm_mapping_symbol map_key
= { memaddr
- obj_section_addr (sec
),
350 data
= (struct arm_per_objfile
*) objfile_data (sec
->objfile
,
351 arm_objfile_data_key
);
354 map
= data
->section_maps
[sec
->the_bfd_section
->index
];
355 if (!VEC_empty (arm_mapping_symbol_s
, map
))
357 struct arm_mapping_symbol
*map_sym
;
359 idx
= VEC_lower_bound (arm_mapping_symbol_s
, map
, &map_key
,
360 arm_compare_mapping_symbols
);
362 /* VEC_lower_bound finds the earliest ordered insertion
363 point. If the following symbol starts at this exact
364 address, we use that; otherwise, the preceding
365 mapping symbol covers this address. */
366 if (idx
< VEC_length (arm_mapping_symbol_s
, map
))
368 map_sym
= VEC_index (arm_mapping_symbol_s
, map
, idx
);
369 if (map_sym
->value
== map_key
.value
)
372 *start
= map_sym
->value
+ obj_section_addr (sec
);
373 return map_sym
->type
;
379 map_sym
= VEC_index (arm_mapping_symbol_s
, map
, idx
- 1);
381 *start
= map_sym
->value
+ obj_section_addr (sec
);
382 return map_sym
->type
;
391 /* Determine if the program counter specified in MEMADDR is in a Thumb
392 function. This function should be called for addresses unrelated to
393 any executing frame; otherwise, prefer arm_frame_is_thumb. */
396 arm_pc_is_thumb (struct gdbarch
*gdbarch
, CORE_ADDR memaddr
)
398 struct bound_minimal_symbol sym
;
400 struct displaced_step_closure
* dsc
401 = get_displaced_step_closure_by_addr(memaddr
);
403 /* If checking the mode of displaced instruction in copy area, the mode
404 should be determined by instruction on the original address. */
408 fprintf_unfiltered (gdb_stdlog
,
409 "displaced: check mode of %.8lx instead of %.8lx\n",
410 (unsigned long) dsc
->insn_addr
,
411 (unsigned long) memaddr
);
412 memaddr
= dsc
->insn_addr
;
415 /* If bit 0 of the address is set, assume this is a Thumb address. */
416 if (IS_THUMB_ADDR (memaddr
))
419 /* If the user wants to override the symbol table, let him. */
420 if (strcmp (arm_force_mode_string
, "arm") == 0)
422 if (strcmp (arm_force_mode_string
, "thumb") == 0)
425 /* ARM v6-M and v7-M are always in Thumb mode. */
426 if (gdbarch_tdep (gdbarch
)->is_m
)
429 /* If there are mapping symbols, consult them. */
430 type
= arm_find_mapping_symbol (memaddr
, NULL
);
434 /* Thumb functions have a "special" bit set in minimal symbols. */
435 sym
= lookup_minimal_symbol_by_pc (memaddr
);
437 return (MSYMBOL_IS_SPECIAL (sym
.minsym
));
439 /* If the user wants to override the fallback mode, let them. */
440 if (strcmp (arm_fallback_mode_string
, "arm") == 0)
442 if (strcmp (arm_fallback_mode_string
, "thumb") == 0)
445 /* If we couldn't find any symbol, but we're talking to a running
446 target, then trust the current value of $cpsr. This lets
447 "display/i $pc" always show the correct mode (though if there is
448 a symbol table we will not reach here, so it still may not be
449 displayed in the mode it will be executed). */
450 if (target_has_registers
)
451 return arm_frame_is_thumb (get_current_frame ());
453 /* Otherwise we're out of luck; we assume ARM. */
457 /* Determine if the address specified equals any of these magic return
458 values, called EXC_RETURN, defined by the ARM v6-M and v7-M
461 From ARMv6-M Reference Manual B1.5.8
462 Table B1-5 Exception return behavior
464 EXC_RETURN Return To Return Stack
465 0xFFFFFFF1 Handler mode Main
466 0xFFFFFFF9 Thread mode Main
467 0xFFFFFFFD Thread mode Process
469 From ARMv7-M Reference Manual B1.5.8
470 Table B1-8 EXC_RETURN definition of exception return behavior, no FP
472 EXC_RETURN Return To Return Stack
473 0xFFFFFFF1 Handler mode Main
474 0xFFFFFFF9 Thread mode Main
475 0xFFFFFFFD Thread mode Process
477 Table B1-9 EXC_RETURN definition of exception return behavior, with
480 EXC_RETURN Return To Return Stack Frame Type
481 0xFFFFFFE1 Handler mode Main Extended
482 0xFFFFFFE9 Thread mode Main Extended
483 0xFFFFFFED Thread mode Process Extended
484 0xFFFFFFF1 Handler mode Main Basic
485 0xFFFFFFF9 Thread mode Main Basic
486 0xFFFFFFFD Thread mode Process Basic
488 For more details see "B1.5.8 Exception return behavior"
489 in both ARMv6-M and ARMv7-M Architecture Reference Manuals. */
492 arm_m_addr_is_magic (CORE_ADDR addr
)
496 /* Values from Tables in B1.5.8 the EXC_RETURN definitions of
497 the exception return behavior. */
504 /* Address is magic. */
508 /* Address is not magic. */
513 /* Remove useless bits from addresses in a running program. */
515 arm_addr_bits_remove (struct gdbarch
*gdbarch
, CORE_ADDR val
)
517 /* On M-profile devices, do not strip the low bit from EXC_RETURN
518 (the magic exception return address). */
519 if (gdbarch_tdep (gdbarch
)->is_m
520 && arm_m_addr_is_magic (val
))
524 return UNMAKE_THUMB_ADDR (val
);
526 return (val
& 0x03fffffc);
529 /* Return 1 if PC is the start of a compiler helper function which
530 can be safely ignored during prologue skipping. IS_THUMB is true
531 if the function is known to be a Thumb function due to the way it
534 skip_prologue_function (struct gdbarch
*gdbarch
, CORE_ADDR pc
, int is_thumb
)
536 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
537 struct bound_minimal_symbol msym
;
539 msym
= lookup_minimal_symbol_by_pc (pc
);
540 if (msym
.minsym
!= NULL
541 && BMSYMBOL_VALUE_ADDRESS (msym
) == pc
542 && MSYMBOL_LINKAGE_NAME (msym
.minsym
) != NULL
)
544 const char *name
= MSYMBOL_LINKAGE_NAME (msym
.minsym
);
546 /* The GNU linker's Thumb call stub to foo is named
548 if (strstr (name
, "_from_thumb") != NULL
)
551 /* On soft-float targets, __truncdfsf2 is called to convert promoted
552 arguments to their argument types in non-prototyped
554 if (startswith (name
, "__truncdfsf2"))
556 if (startswith (name
, "__aeabi_d2f"))
559 /* Internal functions related to thread-local storage. */
560 if (startswith (name
, "__tls_get_addr"))
562 if (startswith (name
, "__aeabi_read_tp"))
567 /* If we run against a stripped glibc, we may be unable to identify
568 special functions by name. Check for one important case,
569 __aeabi_read_tp, by comparing the *code* against the default
570 implementation (this is hand-written ARM assembler in glibc). */
573 && read_memory_unsigned_integer (pc
, 4, byte_order_for_code
)
574 == 0xe3e00a0f /* mov r0, #0xffff0fff */
575 && read_memory_unsigned_integer (pc
+ 4, 4, byte_order_for_code
)
576 == 0xe240f01f) /* sub pc, r0, #31 */
583 /* Extract the immediate from instruction movw/movt of encoding T. INSN1 is
584 the first 16-bit of instruction, and INSN2 is the second 16-bit of
586 #define EXTRACT_MOVW_MOVT_IMM_T(insn1, insn2) \
587 ((bits ((insn1), 0, 3) << 12) \
588 | (bits ((insn1), 10, 10) << 11) \
589 | (bits ((insn2), 12, 14) << 8) \
590 | bits ((insn2), 0, 7))
592 /* Extract the immediate from instruction movw/movt of encoding A. INSN is
593 the 32-bit instruction. */
594 #define EXTRACT_MOVW_MOVT_IMM_A(insn) \
595 ((bits ((insn), 16, 19) << 12) \
596 | bits ((insn), 0, 11))
598 /* Decode immediate value; implements ThumbExpandImmediate pseudo-op. */
601 thumb_expand_immediate (unsigned int imm
)
603 unsigned int count
= imm
>> 7;
611 return (imm
& 0xff) | ((imm
& 0xff) << 16);
613 return ((imm
& 0xff) << 8) | ((imm
& 0xff) << 24);
615 return (imm
& 0xff) | ((imm
& 0xff) << 8)
616 | ((imm
& 0xff) << 16) | ((imm
& 0xff) << 24);
619 return (0x80 | (imm
& 0x7f)) << (32 - count
);
622 /* Return 1 if the 16-bit Thumb instruction INSN restores SP in
623 epilogue, 0 otherwise. */
626 thumb_instruction_restores_sp (unsigned short insn
)
628 return (insn
== 0x46bd /* mov sp, r7 */
629 || (insn
& 0xff80) == 0xb000 /* add sp, imm */
630 || (insn
& 0xfe00) == 0xbc00); /* pop <registers> */
633 /* Analyze a Thumb prologue, looking for a recognizable stack frame
634 and frame pointer. Scan until we encounter a store that could
635 clobber the stack frame unexpectedly, or an unknown instruction.
636 Return the last address which is definitely safe to skip for an
637 initial breakpoint. */
640 thumb_analyze_prologue (struct gdbarch
*gdbarch
,
641 CORE_ADDR start
, CORE_ADDR limit
,
642 struct arm_prologue_cache
*cache
)
644 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
645 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
648 struct pv_area
*stack
;
649 struct cleanup
*back_to
;
651 CORE_ADDR unrecognized_pc
= 0;
653 for (i
= 0; i
< 16; i
++)
654 regs
[i
] = pv_register (i
, 0);
655 stack
= make_pv_area (ARM_SP_REGNUM
, gdbarch_addr_bit (gdbarch
));
656 back_to
= make_cleanup_free_pv_area (stack
);
658 while (start
< limit
)
662 insn
= read_memory_unsigned_integer (start
, 2, byte_order_for_code
);
664 if ((insn
& 0xfe00) == 0xb400) /* push { rlist } */
669 if (pv_area_store_would_trash (stack
, regs
[ARM_SP_REGNUM
]))
672 /* Bits 0-7 contain a mask for registers R0-R7. Bit 8 says
673 whether to save LR (R14). */
674 mask
= (insn
& 0xff) | ((insn
& 0x100) << 6);
676 /* Calculate offsets of saved R0-R7 and LR. */
677 for (regno
= ARM_LR_REGNUM
; regno
>= 0; regno
--)
678 if (mask
& (1 << regno
))
680 regs
[ARM_SP_REGNUM
] = pv_add_constant (regs
[ARM_SP_REGNUM
],
682 pv_area_store (stack
, regs
[ARM_SP_REGNUM
], 4, regs
[regno
]);
685 else if ((insn
& 0xff80) == 0xb080) /* sub sp, #imm */
687 offset
= (insn
& 0x7f) << 2; /* get scaled offset */
688 regs
[ARM_SP_REGNUM
] = pv_add_constant (regs
[ARM_SP_REGNUM
],
691 else if (thumb_instruction_restores_sp (insn
))
693 /* Don't scan past the epilogue. */
696 else if ((insn
& 0xf800) == 0xa800) /* add Rd, sp, #imm */
697 regs
[bits (insn
, 8, 10)] = pv_add_constant (regs
[ARM_SP_REGNUM
],
699 else if ((insn
& 0xfe00) == 0x1c00 /* add Rd, Rn, #imm */
700 && pv_is_register (regs
[bits (insn
, 3, 5)], ARM_SP_REGNUM
))
701 regs
[bits (insn
, 0, 2)] = pv_add_constant (regs
[bits (insn
, 3, 5)],
703 else if ((insn
& 0xf800) == 0x3000 /* add Rd, #imm */
704 && pv_is_register (regs
[bits (insn
, 8, 10)], ARM_SP_REGNUM
))
705 regs
[bits (insn
, 8, 10)] = pv_add_constant (regs
[bits (insn
, 8, 10)],
707 else if ((insn
& 0xfe00) == 0x1800 /* add Rd, Rn, Rm */
708 && pv_is_register (regs
[bits (insn
, 6, 8)], ARM_SP_REGNUM
)
709 && pv_is_constant (regs
[bits (insn
, 3, 5)]))
710 regs
[bits (insn
, 0, 2)] = pv_add (regs
[bits (insn
, 3, 5)],
711 regs
[bits (insn
, 6, 8)]);
712 else if ((insn
& 0xff00) == 0x4400 /* add Rd, Rm */
713 && pv_is_constant (regs
[bits (insn
, 3, 6)]))
715 int rd
= (bit (insn
, 7) << 3) + bits (insn
, 0, 2);
716 int rm
= bits (insn
, 3, 6);
717 regs
[rd
] = pv_add (regs
[rd
], regs
[rm
]);
719 else if ((insn
& 0xff00) == 0x4600) /* mov hi, lo or mov lo, hi */
721 int dst_reg
= (insn
& 0x7) + ((insn
& 0x80) >> 4);
722 int src_reg
= (insn
& 0x78) >> 3;
723 regs
[dst_reg
] = regs
[src_reg
];
725 else if ((insn
& 0xf800) == 0x9000) /* str rd, [sp, #off] */
727 /* Handle stores to the stack. Normally pushes are used,
728 but with GCC -mtpcs-frame, there may be other stores
729 in the prologue to create the frame. */
730 int regno
= (insn
>> 8) & 0x7;
733 offset
= (insn
& 0xff) << 2;
734 addr
= pv_add_constant (regs
[ARM_SP_REGNUM
], offset
);
736 if (pv_area_store_would_trash (stack
, addr
))
739 pv_area_store (stack
, addr
, 4, regs
[regno
]);
741 else if ((insn
& 0xf800) == 0x6000) /* str rd, [rn, #off] */
743 int rd
= bits (insn
, 0, 2);
744 int rn
= bits (insn
, 3, 5);
747 offset
= bits (insn
, 6, 10) << 2;
748 addr
= pv_add_constant (regs
[rn
], offset
);
750 if (pv_area_store_would_trash (stack
, addr
))
753 pv_area_store (stack
, addr
, 4, regs
[rd
]);
755 else if (((insn
& 0xf800) == 0x7000 /* strb Rd, [Rn, #off] */
756 || (insn
& 0xf800) == 0x8000) /* strh Rd, [Rn, #off] */
757 && pv_is_register (regs
[bits (insn
, 3, 5)], ARM_SP_REGNUM
))
758 /* Ignore stores of argument registers to the stack. */
760 else if ((insn
& 0xf800) == 0xc800 /* ldmia Rn!, { registers } */
761 && pv_is_register (regs
[bits (insn
, 8, 10)], ARM_SP_REGNUM
))
762 /* Ignore block loads from the stack, potentially copying
763 parameters from memory. */
765 else if ((insn
& 0xf800) == 0x9800 /* ldr Rd, [Rn, #immed] */
766 || ((insn
& 0xf800) == 0x6800 /* ldr Rd, [sp, #immed] */
767 && pv_is_register (regs
[bits (insn
, 3, 5)], ARM_SP_REGNUM
)))
768 /* Similarly ignore single loads from the stack. */
770 else if ((insn
& 0xffc0) == 0x0000 /* lsls Rd, Rm, #0 */
771 || (insn
& 0xffc0) == 0x1c00) /* add Rd, Rn, #0 */
772 /* Skip register copies, i.e. saves to another register
773 instead of the stack. */
775 else if ((insn
& 0xf800) == 0x2000) /* movs Rd, #imm */
776 /* Recognize constant loads; even with small stacks these are necessary
778 regs
[bits (insn
, 8, 10)] = pv_constant (bits (insn
, 0, 7));
779 else if ((insn
& 0xf800) == 0x4800) /* ldr Rd, [pc, #imm] */
781 /* Constant pool loads, for the same reason. */
782 unsigned int constant
;
785 loc
= start
+ 4 + bits (insn
, 0, 7) * 4;
786 constant
= read_memory_unsigned_integer (loc
, 4, byte_order
);
787 regs
[bits (insn
, 8, 10)] = pv_constant (constant
);
789 else if (thumb_insn_size (insn
) == 4) /* 32-bit Thumb-2 instructions. */
791 unsigned short inst2
;
793 inst2
= read_memory_unsigned_integer (start
+ 2, 2,
794 byte_order_for_code
);
796 if ((insn
& 0xf800) == 0xf000 && (inst2
& 0xe800) == 0xe800)
798 /* BL, BLX. Allow some special function calls when
799 skipping the prologue; GCC generates these before
800 storing arguments to the stack. */
802 int j1
, j2
, imm1
, imm2
;
804 imm1
= sbits (insn
, 0, 10);
805 imm2
= bits (inst2
, 0, 10);
806 j1
= bit (inst2
, 13);
807 j2
= bit (inst2
, 11);
809 offset
= ((imm1
<< 12) + (imm2
<< 1));
810 offset
^= ((!j2
) << 22) | ((!j1
) << 23);
812 nextpc
= start
+ 4 + offset
;
813 /* For BLX make sure to clear the low bits. */
814 if (bit (inst2
, 12) == 0)
815 nextpc
= nextpc
& 0xfffffffc;
817 if (!skip_prologue_function (gdbarch
, nextpc
,
818 bit (inst2
, 12) != 0))
822 else if ((insn
& 0xffd0) == 0xe900 /* stmdb Rn{!},
824 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
826 pv_t addr
= regs
[bits (insn
, 0, 3)];
829 if (pv_area_store_would_trash (stack
, addr
))
832 /* Calculate offsets of saved registers. */
833 for (regno
= ARM_LR_REGNUM
; regno
>= 0; regno
--)
834 if (inst2
& (1 << regno
))
836 addr
= pv_add_constant (addr
, -4);
837 pv_area_store (stack
, addr
, 4, regs
[regno
]);
841 regs
[bits (insn
, 0, 3)] = addr
;
844 else if ((insn
& 0xff50) == 0xe940 /* strd Rt, Rt2,
846 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
848 int regno1
= bits (inst2
, 12, 15);
849 int regno2
= bits (inst2
, 8, 11);
850 pv_t addr
= regs
[bits (insn
, 0, 3)];
852 offset
= inst2
& 0xff;
854 addr
= pv_add_constant (addr
, offset
);
856 addr
= pv_add_constant (addr
, -offset
);
858 if (pv_area_store_would_trash (stack
, addr
))
861 pv_area_store (stack
, addr
, 4, regs
[regno1
]);
862 pv_area_store (stack
, pv_add_constant (addr
, 4),
866 regs
[bits (insn
, 0, 3)] = addr
;
869 else if ((insn
& 0xfff0) == 0xf8c0 /* str Rt,[Rn,+/-#imm]{!} */
870 && (inst2
& 0x0c00) == 0x0c00
871 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
873 int regno
= bits (inst2
, 12, 15);
874 pv_t addr
= regs
[bits (insn
, 0, 3)];
876 offset
= inst2
& 0xff;
878 addr
= pv_add_constant (addr
, offset
);
880 addr
= pv_add_constant (addr
, -offset
);
882 if (pv_area_store_would_trash (stack
, addr
))
885 pv_area_store (stack
, addr
, 4, regs
[regno
]);
888 regs
[bits (insn
, 0, 3)] = addr
;
891 else if ((insn
& 0xfff0) == 0xf8c0 /* str.w Rt,[Rn,#imm] */
892 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
894 int regno
= bits (inst2
, 12, 15);
897 offset
= inst2
& 0xfff;
898 addr
= pv_add_constant (regs
[bits (insn
, 0, 3)], offset
);
900 if (pv_area_store_would_trash (stack
, addr
))
903 pv_area_store (stack
, addr
, 4, regs
[regno
]);
906 else if ((insn
& 0xffd0) == 0xf880 /* str{bh}.w Rt,[Rn,#imm] */
907 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
908 /* Ignore stores of argument registers to the stack. */
911 else if ((insn
& 0xffd0) == 0xf800 /* str{bh} Rt,[Rn,#+/-imm] */
912 && (inst2
& 0x0d00) == 0x0c00
913 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
914 /* Ignore stores of argument registers to the stack. */
917 else if ((insn
& 0xffd0) == 0xe890 /* ldmia Rn[!],
919 && (inst2
& 0x8000) == 0x0000
920 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
921 /* Ignore block loads from the stack, potentially copying
922 parameters from memory. */
925 else if ((insn
& 0xffb0) == 0xe950 /* ldrd Rt, Rt2,
927 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
928 /* Similarly ignore dual loads from the stack. */
931 else if ((insn
& 0xfff0) == 0xf850 /* ldr Rt,[Rn,#+/-imm] */
932 && (inst2
& 0x0d00) == 0x0c00
933 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
934 /* Similarly ignore single loads from the stack. */
937 else if ((insn
& 0xfff0) == 0xf8d0 /* ldr.w Rt,[Rn,#imm] */
938 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
939 /* Similarly ignore single loads from the stack. */
942 else if ((insn
& 0xfbf0) == 0xf100 /* add.w Rd, Rn, #imm */
943 && (inst2
& 0x8000) == 0x0000)
945 unsigned int imm
= ((bits (insn
, 10, 10) << 11)
946 | (bits (inst2
, 12, 14) << 8)
947 | bits (inst2
, 0, 7));
949 regs
[bits (inst2
, 8, 11)]
950 = pv_add_constant (regs
[bits (insn
, 0, 3)],
951 thumb_expand_immediate (imm
));
954 else if ((insn
& 0xfbf0) == 0xf200 /* addw Rd, Rn, #imm */
955 && (inst2
& 0x8000) == 0x0000)
957 unsigned int imm
= ((bits (insn
, 10, 10) << 11)
958 | (bits (inst2
, 12, 14) << 8)
959 | bits (inst2
, 0, 7));
961 regs
[bits (inst2
, 8, 11)]
962 = pv_add_constant (regs
[bits (insn
, 0, 3)], imm
);
965 else if ((insn
& 0xfbf0) == 0xf1a0 /* sub.w Rd, Rn, #imm */
966 && (inst2
& 0x8000) == 0x0000)
968 unsigned int imm
= ((bits (insn
, 10, 10) << 11)
969 | (bits (inst2
, 12, 14) << 8)
970 | bits (inst2
, 0, 7));
972 regs
[bits (inst2
, 8, 11)]
973 = pv_add_constant (regs
[bits (insn
, 0, 3)],
974 - (CORE_ADDR
) thumb_expand_immediate (imm
));
977 else if ((insn
& 0xfbf0) == 0xf2a0 /* subw Rd, Rn, #imm */
978 && (inst2
& 0x8000) == 0x0000)
980 unsigned int imm
= ((bits (insn
, 10, 10) << 11)
981 | (bits (inst2
, 12, 14) << 8)
982 | bits (inst2
, 0, 7));
984 regs
[bits (inst2
, 8, 11)]
985 = pv_add_constant (regs
[bits (insn
, 0, 3)], - (CORE_ADDR
) imm
);
988 else if ((insn
& 0xfbff) == 0xf04f) /* mov.w Rd, #const */
990 unsigned int imm
= ((bits (insn
, 10, 10) << 11)
991 | (bits (inst2
, 12, 14) << 8)
992 | bits (inst2
, 0, 7));
994 regs
[bits (inst2
, 8, 11)]
995 = pv_constant (thumb_expand_immediate (imm
));
998 else if ((insn
& 0xfbf0) == 0xf240) /* movw Rd, #const */
1001 = EXTRACT_MOVW_MOVT_IMM_T (insn
, inst2
);
1003 regs
[bits (inst2
, 8, 11)] = pv_constant (imm
);
1006 else if (insn
== 0xea5f /* mov.w Rd,Rm */
1007 && (inst2
& 0xf0f0) == 0)
1009 int dst_reg
= (inst2
& 0x0f00) >> 8;
1010 int src_reg
= inst2
& 0xf;
1011 regs
[dst_reg
] = regs
[src_reg
];
1014 else if ((insn
& 0xff7f) == 0xf85f) /* ldr.w Rt,<label> */
1016 /* Constant pool loads. */
1017 unsigned int constant
;
1020 offset
= bits (inst2
, 0, 11);
1022 loc
= start
+ 4 + offset
;
1024 loc
= start
+ 4 - offset
;
1026 constant
= read_memory_unsigned_integer (loc
, 4, byte_order
);
1027 regs
[bits (inst2
, 12, 15)] = pv_constant (constant
);
1030 else if ((insn
& 0xff7f) == 0xe95f) /* ldrd Rt,Rt2,<label> */
1032 /* Constant pool loads. */
1033 unsigned int constant
;
1036 offset
= bits (inst2
, 0, 7) << 2;
1038 loc
= start
+ 4 + offset
;
1040 loc
= start
+ 4 - offset
;
1042 constant
= read_memory_unsigned_integer (loc
, 4, byte_order
);
1043 regs
[bits (inst2
, 12, 15)] = pv_constant (constant
);
1045 constant
= read_memory_unsigned_integer (loc
+ 4, 4, byte_order
);
1046 regs
[bits (inst2
, 8, 11)] = pv_constant (constant
);
1049 else if (thumb2_instruction_changes_pc (insn
, inst2
))
1051 /* Don't scan past anything that might change control flow. */
1056 /* The optimizer might shove anything into the prologue,
1057 so we just skip what we don't recognize. */
1058 unrecognized_pc
= start
;
1063 else if (thumb_instruction_changes_pc (insn
))
1065 /* Don't scan past anything that might change control flow. */
1070 /* The optimizer might shove anything into the prologue,
1071 so we just skip what we don't recognize. */
1072 unrecognized_pc
= start
;
1079 fprintf_unfiltered (gdb_stdlog
, "Prologue scan stopped at %s\n",
1080 paddress (gdbarch
, start
));
1082 if (unrecognized_pc
== 0)
1083 unrecognized_pc
= start
;
1087 do_cleanups (back_to
);
1088 return unrecognized_pc
;
1091 if (pv_is_register (regs
[ARM_FP_REGNUM
], ARM_SP_REGNUM
))
1093 /* Frame pointer is fp. Frame size is constant. */
1094 cache
->framereg
= ARM_FP_REGNUM
;
1095 cache
->framesize
= -regs
[ARM_FP_REGNUM
].k
;
1097 else if (pv_is_register (regs
[THUMB_FP_REGNUM
], ARM_SP_REGNUM
))
1099 /* Frame pointer is r7. Frame size is constant. */
1100 cache
->framereg
= THUMB_FP_REGNUM
;
1101 cache
->framesize
= -regs
[THUMB_FP_REGNUM
].k
;
1105 /* Try the stack pointer... this is a bit desperate. */
1106 cache
->framereg
= ARM_SP_REGNUM
;
1107 cache
->framesize
= -regs
[ARM_SP_REGNUM
].k
;
1110 for (i
= 0; i
< 16; i
++)
1111 if (pv_area_find_reg (stack
, gdbarch
, i
, &offset
))
1112 cache
->saved_regs
[i
].addr
= offset
;
1114 do_cleanups (back_to
);
1115 return unrecognized_pc
;
1119 /* Try to analyze the instructions starting from PC, which load symbol
1120 __stack_chk_guard. Return the address of instruction after loading this
1121 symbol, set the dest register number to *BASEREG, and set the size of
1122 instructions for loading symbol in OFFSET. Return 0 if instructions are
1126 arm_analyze_load_stack_chk_guard(CORE_ADDR pc
, struct gdbarch
*gdbarch
,
1127 unsigned int *destreg
, int *offset
)
1129 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
1130 int is_thumb
= arm_pc_is_thumb (gdbarch
, pc
);
1131 unsigned int low
, high
, address
;
1136 unsigned short insn1
1137 = read_memory_unsigned_integer (pc
, 2, byte_order_for_code
);
1139 if ((insn1
& 0xf800) == 0x4800) /* ldr Rd, #immed */
1141 *destreg
= bits (insn1
, 8, 10);
1143 address
= (pc
& 0xfffffffc) + 4 + (bits (insn1
, 0, 7) << 2);
1144 address
= read_memory_unsigned_integer (address
, 4,
1145 byte_order_for_code
);
1147 else if ((insn1
& 0xfbf0) == 0xf240) /* movw Rd, #const */
1149 unsigned short insn2
1150 = read_memory_unsigned_integer (pc
+ 2, 2, byte_order_for_code
);
1152 low
= EXTRACT_MOVW_MOVT_IMM_T (insn1
, insn2
);
1155 = read_memory_unsigned_integer (pc
+ 4, 2, byte_order_for_code
);
1157 = read_memory_unsigned_integer (pc
+ 6, 2, byte_order_for_code
);
1159 /* movt Rd, #const */
1160 if ((insn1
& 0xfbc0) == 0xf2c0)
1162 high
= EXTRACT_MOVW_MOVT_IMM_T (insn1
, insn2
);
1163 *destreg
= bits (insn2
, 8, 11);
1165 address
= (high
<< 16 | low
);
1172 = read_memory_unsigned_integer (pc
, 4, byte_order_for_code
);
1174 if ((insn
& 0x0e5f0000) == 0x041f0000) /* ldr Rd, [PC, #immed] */
1176 address
= bits (insn
, 0, 11) + pc
+ 8;
1177 address
= read_memory_unsigned_integer (address
, 4,
1178 byte_order_for_code
);
1180 *destreg
= bits (insn
, 12, 15);
1183 else if ((insn
& 0x0ff00000) == 0x03000000) /* movw Rd, #const */
1185 low
= EXTRACT_MOVW_MOVT_IMM_A (insn
);
1188 = read_memory_unsigned_integer (pc
+ 4, 4, byte_order_for_code
);
1190 if ((insn
& 0x0ff00000) == 0x03400000) /* movt Rd, #const */
1192 high
= EXTRACT_MOVW_MOVT_IMM_A (insn
);
1193 *destreg
= bits (insn
, 12, 15);
1195 address
= (high
<< 16 | low
);
1203 /* Try to skip a sequence of instructions used for stack protector. If PC
1204 points to the first instruction of this sequence, return the address of
1205 first instruction after this sequence, otherwise, return original PC.
1207 On arm, this sequence of instructions is composed of mainly three steps,
1208 Step 1: load symbol __stack_chk_guard,
1209 Step 2: load from address of __stack_chk_guard,
1210 Step 3: store it to somewhere else.
1212 Usually, instructions on step 2 and step 3 are the same on various ARM
1213 architectures. On step 2, it is one instruction 'ldr Rx, [Rn, #0]', and
1214 on step 3, it is also one instruction 'str Rx, [r7, #immd]'. However,
1215 instructions in step 1 vary from different ARM architectures. On ARMv7,
1218 movw Rn, #:lower16:__stack_chk_guard
1219 movt Rn, #:upper16:__stack_chk_guard
1226 .word __stack_chk_guard
1228 Since ldr/str is a very popular instruction, we can't use them as
1229 'fingerprint' or 'signature' of stack protector sequence. Here we choose
1230 sequence {movw/movt, ldr}/ldr/str plus symbol __stack_chk_guard, if not
1231 stripped, as the 'fingerprint' of a stack protector cdoe sequence. */
1234 arm_skip_stack_protector(CORE_ADDR pc
, struct gdbarch
*gdbarch
)
1236 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
1237 unsigned int basereg
;
1238 struct bound_minimal_symbol stack_chk_guard
;
1240 int is_thumb
= arm_pc_is_thumb (gdbarch
, pc
);
1243 /* Try to parse the instructions in Step 1. */
1244 addr
= arm_analyze_load_stack_chk_guard (pc
, gdbarch
,
1249 stack_chk_guard
= lookup_minimal_symbol_by_pc (addr
);
1250 /* ADDR must correspond to a symbol whose name is __stack_chk_guard.
1251 Otherwise, this sequence cannot be for stack protector. */
1252 if (stack_chk_guard
.minsym
== NULL
1253 || !startswith (MSYMBOL_LINKAGE_NAME (stack_chk_guard
.minsym
), "__stack_chk_guard"))
1258 unsigned int destreg
;
1260 = read_memory_unsigned_integer (pc
+ offset
, 2, byte_order_for_code
);
1262 /* Step 2: ldr Rd, [Rn, #immed], encoding T1. */
1263 if ((insn
& 0xf800) != 0x6800)
1265 if (bits (insn
, 3, 5) != basereg
)
1267 destreg
= bits (insn
, 0, 2);
1269 insn
= read_memory_unsigned_integer (pc
+ offset
+ 2, 2,
1270 byte_order_for_code
);
1271 /* Step 3: str Rd, [Rn, #immed], encoding T1. */
1272 if ((insn
& 0xf800) != 0x6000)
1274 if (destreg
!= bits (insn
, 0, 2))
1279 unsigned int destreg
;
1281 = read_memory_unsigned_integer (pc
+ offset
, 4, byte_order_for_code
);
1283 /* Step 2: ldr Rd, [Rn, #immed], encoding A1. */
1284 if ((insn
& 0x0e500000) != 0x04100000)
1286 if (bits (insn
, 16, 19) != basereg
)
1288 destreg
= bits (insn
, 12, 15);
1289 /* Step 3: str Rd, [Rn, #immed], encoding A1. */
1290 insn
= read_memory_unsigned_integer (pc
+ offset
+ 4,
1291 4, byte_order_for_code
);
1292 if ((insn
& 0x0e500000) != 0x04000000)
1294 if (bits (insn
, 12, 15) != destreg
)
1297 /* The size of total two instructions ldr/str is 4 on Thumb-2, while 8
1300 return pc
+ offset
+ 4;
1302 return pc
+ offset
+ 8;
1305 /* Advance the PC across any function entry prologue instructions to
1306 reach some "real" code.
1308 The APCS (ARM Procedure Call Standard) defines the following
1312 [stmfd sp!, {a1,a2,a3,a4}]
1313 stmfd sp!, {...,fp,ip,lr,pc}
1314 [stfe f7, [sp, #-12]!]
1315 [stfe f6, [sp, #-12]!]
1316 [stfe f5, [sp, #-12]!]
1317 [stfe f4, [sp, #-12]!]
1318 sub fp, ip, #nn @@ nn == 20 or 4 depending on second insn. */
1321 arm_skip_prologue (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
1323 CORE_ADDR func_addr
, limit_pc
;
1325 /* See if we can determine the end of the prologue via the symbol table.
1326 If so, then return either PC, or the PC after the prologue, whichever
1328 if (find_pc_partial_function (pc
, NULL
, &func_addr
, NULL
))
1330 CORE_ADDR post_prologue_pc
1331 = skip_prologue_using_sal (gdbarch
, func_addr
);
1332 struct compunit_symtab
*cust
= find_pc_compunit_symtab (func_addr
);
1334 if (post_prologue_pc
)
1336 = arm_skip_stack_protector (post_prologue_pc
, gdbarch
);
1339 /* GCC always emits a line note before the prologue and another
1340 one after, even if the two are at the same address or on the
1341 same line. Take advantage of this so that we do not need to
1342 know every instruction that might appear in the prologue. We
1343 will have producer information for most binaries; if it is
1344 missing (e.g. for -gstabs), assuming the GNU tools. */
1345 if (post_prologue_pc
1347 || COMPUNIT_PRODUCER (cust
) == NULL
1348 || startswith (COMPUNIT_PRODUCER (cust
), "GNU ")
1349 || startswith (COMPUNIT_PRODUCER (cust
), "clang ")))
1350 return post_prologue_pc
;
1352 if (post_prologue_pc
!= 0)
1354 CORE_ADDR analyzed_limit
;
1356 /* For non-GCC compilers, make sure the entire line is an
1357 acceptable prologue; GDB will round this function's
1358 return value up to the end of the following line so we
1359 can not skip just part of a line (and we do not want to).
1361 RealView does not treat the prologue specially, but does
1362 associate prologue code with the opening brace; so this
1363 lets us skip the first line if we think it is the opening
1365 if (arm_pc_is_thumb (gdbarch
, func_addr
))
1366 analyzed_limit
= thumb_analyze_prologue (gdbarch
, func_addr
,
1367 post_prologue_pc
, NULL
);
1369 analyzed_limit
= arm_analyze_prologue (gdbarch
, func_addr
,
1370 post_prologue_pc
, NULL
);
1372 if (analyzed_limit
!= post_prologue_pc
)
1375 return post_prologue_pc
;
1379 /* Can't determine prologue from the symbol table, need to examine
1382 /* Find an upper limit on the function prologue using the debug
1383 information. If the debug information could not be used to provide
1384 that bound, then use an arbitrary large number as the upper bound. */
1385 /* Like arm_scan_prologue, stop no later than pc + 64. */
1386 limit_pc
= skip_prologue_using_sal (gdbarch
, pc
);
1388 limit_pc
= pc
+ 64; /* Magic. */
1391 /* Check if this is Thumb code. */
1392 if (arm_pc_is_thumb (gdbarch
, pc
))
1393 return thumb_analyze_prologue (gdbarch
, pc
, limit_pc
, NULL
);
1395 return arm_analyze_prologue (gdbarch
, pc
, limit_pc
, NULL
);
1399 /* Function: thumb_scan_prologue (helper function for arm_scan_prologue)
1400 This function decodes a Thumb function prologue to determine:
1401 1) the size of the stack frame
1402 2) which registers are saved on it
1403 3) the offsets of saved regs
1404 4) the offset from the stack pointer to the frame pointer
1406 A typical Thumb function prologue would create this stack frame
1407 (offsets relative to FP)
1408 old SP -> 24 stack parameters
1411 R7 -> 0 local variables (16 bytes)
1412 SP -> -12 additional stack space (12 bytes)
1413 The frame size would thus be 36 bytes, and the frame offset would be
1414 12 bytes. The frame register is R7.
1416 The comments for thumb_skip_prolog() describe the algorithm we use
1417 to detect the end of the prolog. */
1421 thumb_scan_prologue (struct gdbarch
*gdbarch
, CORE_ADDR prev_pc
,
1422 CORE_ADDR block_addr
, struct arm_prologue_cache
*cache
)
1424 CORE_ADDR prologue_start
;
1425 CORE_ADDR prologue_end
;
1427 if (find_pc_partial_function (block_addr
, NULL
, &prologue_start
,
1430 /* See comment in arm_scan_prologue for an explanation of
1432 if (prologue_end
> prologue_start
+ 64)
1434 prologue_end
= prologue_start
+ 64;
1438 /* We're in the boondocks: we have no idea where the start of the
1442 prologue_end
= std::min (prologue_end
, prev_pc
);
1444 thumb_analyze_prologue (gdbarch
, prologue_start
, prologue_end
, cache
);
1447 /* Return 1 if the ARM instruction INSN restores SP in epilogue, 0
1451 arm_instruction_restores_sp (unsigned int insn
)
1453 if (bits (insn
, 28, 31) != INST_NV
)
1455 if ((insn
& 0x0df0f000) == 0x0080d000
1456 /* ADD SP (register or immediate). */
1457 || (insn
& 0x0df0f000) == 0x0040d000
1458 /* SUB SP (register or immediate). */
1459 || (insn
& 0x0ffffff0) == 0x01a0d000
1461 || (insn
& 0x0fff0000) == 0x08bd0000
1463 || (insn
& 0x0fff0000) == 0x049d0000)
1464 /* POP of a single register. */
1471 /* Analyze an ARM mode prologue starting at PROLOGUE_START and
1472 continuing no further than PROLOGUE_END. If CACHE is non-NULL,
1473 fill it in. Return the first address not recognized as a prologue
1476 We recognize all the instructions typically found in ARM prologues,
1477 plus harmless instructions which can be skipped (either for analysis
1478 purposes, or a more restrictive set that can be skipped when finding
1479 the end of the prologue). */
1482 arm_analyze_prologue (struct gdbarch
*gdbarch
,
1483 CORE_ADDR prologue_start
, CORE_ADDR prologue_end
,
1484 struct arm_prologue_cache
*cache
)
1486 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
1488 CORE_ADDR offset
, current_pc
;
1489 pv_t regs
[ARM_FPS_REGNUM
];
1490 struct pv_area
*stack
;
1491 struct cleanup
*back_to
;
1492 CORE_ADDR unrecognized_pc
= 0;
1494 /* Search the prologue looking for instructions that set up the
1495 frame pointer, adjust the stack pointer, and save registers.
1497 Be careful, however, and if it doesn't look like a prologue,
1498 don't try to scan it. If, for instance, a frameless function
1499 begins with stmfd sp!, then we will tell ourselves there is
1500 a frame, which will confuse stack traceback, as well as "finish"
1501 and other operations that rely on a knowledge of the stack
1504 for (regno
= 0; regno
< ARM_FPS_REGNUM
; regno
++)
1505 regs
[regno
] = pv_register (regno
, 0);
1506 stack
= make_pv_area (ARM_SP_REGNUM
, gdbarch_addr_bit (gdbarch
));
1507 back_to
= make_cleanup_free_pv_area (stack
);
1509 for (current_pc
= prologue_start
;
1510 current_pc
< prologue_end
;
1514 = read_memory_unsigned_integer (current_pc
, 4, byte_order_for_code
);
1516 if (insn
== 0xe1a0c00d) /* mov ip, sp */
1518 regs
[ARM_IP_REGNUM
] = regs
[ARM_SP_REGNUM
];
1521 else if ((insn
& 0xfff00000) == 0xe2800000 /* add Rd, Rn, #n */
1522 && pv_is_register (regs
[bits (insn
, 16, 19)], ARM_SP_REGNUM
))
1524 unsigned imm
= insn
& 0xff; /* immediate value */
1525 unsigned rot
= (insn
& 0xf00) >> 7; /* rotate amount */
1526 int rd
= bits (insn
, 12, 15);
1527 imm
= (imm
>> rot
) | (imm
<< (32 - rot
));
1528 regs
[rd
] = pv_add_constant (regs
[bits (insn
, 16, 19)], imm
);
1531 else if ((insn
& 0xfff00000) == 0xe2400000 /* sub Rd, Rn, #n */
1532 && pv_is_register (regs
[bits (insn
, 16, 19)], ARM_SP_REGNUM
))
1534 unsigned imm
= insn
& 0xff; /* immediate value */
1535 unsigned rot
= (insn
& 0xf00) >> 7; /* rotate amount */
1536 int rd
= bits (insn
, 12, 15);
1537 imm
= (imm
>> rot
) | (imm
<< (32 - rot
));
1538 regs
[rd
] = pv_add_constant (regs
[bits (insn
, 16, 19)], -imm
);
1541 else if ((insn
& 0xffff0fff) == 0xe52d0004) /* str Rd,
1544 if (pv_area_store_would_trash (stack
, regs
[ARM_SP_REGNUM
]))
1546 regs
[ARM_SP_REGNUM
] = pv_add_constant (regs
[ARM_SP_REGNUM
], -4);
1547 pv_area_store (stack
, regs
[ARM_SP_REGNUM
], 4,
1548 regs
[bits (insn
, 12, 15)]);
1551 else if ((insn
& 0xffff0000) == 0xe92d0000)
1552 /* stmfd sp!, {..., fp, ip, lr, pc}
1554 stmfd sp!, {a1, a2, a3, a4} */
1556 int mask
= insn
& 0xffff;
1558 if (pv_area_store_would_trash (stack
, regs
[ARM_SP_REGNUM
]))
1561 /* Calculate offsets of saved registers. */
1562 for (regno
= ARM_PC_REGNUM
; regno
>= 0; regno
--)
1563 if (mask
& (1 << regno
))
1566 = pv_add_constant (regs
[ARM_SP_REGNUM
], -4);
1567 pv_area_store (stack
, regs
[ARM_SP_REGNUM
], 4, regs
[regno
]);
1570 else if ((insn
& 0xffff0000) == 0xe54b0000 /* strb rx,[r11,#-n] */
1571 || (insn
& 0xffff00f0) == 0xe14b00b0 /* strh rx,[r11,#-n] */
1572 || (insn
& 0xffffc000) == 0xe50b0000) /* str rx,[r11,#-n] */
1574 /* No need to add this to saved_regs -- it's just an arg reg. */
1577 else if ((insn
& 0xffff0000) == 0xe5cd0000 /* strb rx,[sp,#n] */
1578 || (insn
& 0xffff00f0) == 0xe1cd00b0 /* strh rx,[sp,#n] */
1579 || (insn
& 0xffffc000) == 0xe58d0000) /* str rx,[sp,#n] */
1581 /* No need to add this to saved_regs -- it's just an arg reg. */
1584 else if ((insn
& 0xfff00000) == 0xe8800000 /* stm Rn,
1586 && pv_is_register (regs
[bits (insn
, 16, 19)], ARM_SP_REGNUM
))
1588 /* No need to add this to saved_regs -- it's just arg regs. */
1591 else if ((insn
& 0xfffff000) == 0xe24cb000) /* sub fp, ip #n */
1593 unsigned imm
= insn
& 0xff; /* immediate value */
1594 unsigned rot
= (insn
& 0xf00) >> 7; /* rotate amount */
1595 imm
= (imm
>> rot
) | (imm
<< (32 - rot
));
1596 regs
[ARM_FP_REGNUM
] = pv_add_constant (regs
[ARM_IP_REGNUM
], -imm
);
1598 else if ((insn
& 0xfffff000) == 0xe24dd000) /* sub sp, sp #n */
1600 unsigned imm
= insn
& 0xff; /* immediate value */
1601 unsigned rot
= (insn
& 0xf00) >> 7; /* rotate amount */
1602 imm
= (imm
>> rot
) | (imm
<< (32 - rot
));
1603 regs
[ARM_SP_REGNUM
] = pv_add_constant (regs
[ARM_SP_REGNUM
], -imm
);
1605 else if ((insn
& 0xffff7fff) == 0xed6d0103 /* stfe f?,
1607 && gdbarch_tdep (gdbarch
)->have_fpa_registers
)
1609 if (pv_area_store_would_trash (stack
, regs
[ARM_SP_REGNUM
]))
1612 regs
[ARM_SP_REGNUM
] = pv_add_constant (regs
[ARM_SP_REGNUM
], -12);
1613 regno
= ARM_F0_REGNUM
+ ((insn
>> 12) & 0x07);
1614 pv_area_store (stack
, regs
[ARM_SP_REGNUM
], 12, regs
[regno
]);
1616 else if ((insn
& 0xffbf0fff) == 0xec2d0200 /* sfmfd f0, 4,
1618 && gdbarch_tdep (gdbarch
)->have_fpa_registers
)
1620 int n_saved_fp_regs
;
1621 unsigned int fp_start_reg
, fp_bound_reg
;
1623 if (pv_area_store_would_trash (stack
, regs
[ARM_SP_REGNUM
]))
1626 if ((insn
& 0x800) == 0x800) /* N0 is set */
1628 if ((insn
& 0x40000) == 0x40000) /* N1 is set */
1629 n_saved_fp_regs
= 3;
1631 n_saved_fp_regs
= 1;
1635 if ((insn
& 0x40000) == 0x40000) /* N1 is set */
1636 n_saved_fp_regs
= 2;
1638 n_saved_fp_regs
= 4;
1641 fp_start_reg
= ARM_F0_REGNUM
+ ((insn
>> 12) & 0x7);
1642 fp_bound_reg
= fp_start_reg
+ n_saved_fp_regs
;
1643 for (; fp_start_reg
< fp_bound_reg
; fp_start_reg
++)
1645 regs
[ARM_SP_REGNUM
] = pv_add_constant (regs
[ARM_SP_REGNUM
], -12);
1646 pv_area_store (stack
, regs
[ARM_SP_REGNUM
], 12,
1647 regs
[fp_start_reg
++]);
1650 else if ((insn
& 0xff000000) == 0xeb000000 && cache
== NULL
) /* bl */
1652 /* Allow some special function calls when skipping the
1653 prologue; GCC generates these before storing arguments to
1655 CORE_ADDR dest
= BranchDest (current_pc
, insn
);
1657 if (skip_prologue_function (gdbarch
, dest
, 0))
1662 else if ((insn
& 0xf0000000) != 0xe0000000)
1663 break; /* Condition not true, exit early. */
1664 else if (arm_instruction_changes_pc (insn
))
1665 /* Don't scan past anything that might change control flow. */
1667 else if (arm_instruction_restores_sp (insn
))
1669 /* Don't scan past the epilogue. */
1672 else if ((insn
& 0xfe500000) == 0xe8100000 /* ldm */
1673 && pv_is_register (regs
[bits (insn
, 16, 19)], ARM_SP_REGNUM
))
1674 /* Ignore block loads from the stack, potentially copying
1675 parameters from memory. */
1677 else if ((insn
& 0xfc500000) == 0xe4100000
1678 && pv_is_register (regs
[bits (insn
, 16, 19)], ARM_SP_REGNUM
))
1679 /* Similarly ignore single loads from the stack. */
1681 else if ((insn
& 0xffff0ff0) == 0xe1a00000)
1682 /* MOV Rd, Rm. Skip register copies, i.e. saves to another
1683 register instead of the stack. */
1687 /* The optimizer might shove anything into the prologue, if
1688 we build up cache (cache != NULL) from scanning prologue,
1689 we just skip what we don't recognize and scan further to
1690 make cache as complete as possible. However, if we skip
1691 prologue, we'll stop immediately on unrecognized
1693 unrecognized_pc
= current_pc
;
1701 if (unrecognized_pc
== 0)
1702 unrecognized_pc
= current_pc
;
1706 int framereg
, framesize
;
1708 /* The frame size is just the distance from the frame register
1709 to the original stack pointer. */
1710 if (pv_is_register (regs
[ARM_FP_REGNUM
], ARM_SP_REGNUM
))
1712 /* Frame pointer is fp. */
1713 framereg
= ARM_FP_REGNUM
;
1714 framesize
= -regs
[ARM_FP_REGNUM
].k
;
1718 /* Try the stack pointer... this is a bit desperate. */
1719 framereg
= ARM_SP_REGNUM
;
1720 framesize
= -regs
[ARM_SP_REGNUM
].k
;
1723 cache
->framereg
= framereg
;
1724 cache
->framesize
= framesize
;
1726 for (regno
= 0; regno
< ARM_FPS_REGNUM
; regno
++)
1727 if (pv_area_find_reg (stack
, gdbarch
, regno
, &offset
))
1728 cache
->saved_regs
[regno
].addr
= offset
;
1732 fprintf_unfiltered (gdb_stdlog
, "Prologue scan stopped at %s\n",
1733 paddress (gdbarch
, unrecognized_pc
));
1735 do_cleanups (back_to
);
1736 return unrecognized_pc
;
1740 arm_scan_prologue (struct frame_info
*this_frame
,
1741 struct arm_prologue_cache
*cache
)
1743 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
1744 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
1745 CORE_ADDR prologue_start
, prologue_end
;
1746 CORE_ADDR prev_pc
= get_frame_pc (this_frame
);
1747 CORE_ADDR block_addr
= get_frame_address_in_block (this_frame
);
1749 /* Assume there is no frame until proven otherwise. */
1750 cache
->framereg
= ARM_SP_REGNUM
;
1751 cache
->framesize
= 0;
1753 /* Check for Thumb prologue. */
1754 if (arm_frame_is_thumb (this_frame
))
1756 thumb_scan_prologue (gdbarch
, prev_pc
, block_addr
, cache
);
1760 /* Find the function prologue. If we can't find the function in
1761 the symbol table, peek in the stack frame to find the PC. */
1762 if (find_pc_partial_function (block_addr
, NULL
, &prologue_start
,
1765 /* One way to find the end of the prologue (which works well
1766 for unoptimized code) is to do the following:
1768 struct symtab_and_line sal = find_pc_line (prologue_start, 0);
1771 prologue_end = prev_pc;
1772 else if (sal.end < prologue_end)
1773 prologue_end = sal.end;
1775 This mechanism is very accurate so long as the optimizer
1776 doesn't move any instructions from the function body into the
1777 prologue. If this happens, sal.end will be the last
1778 instruction in the first hunk of prologue code just before
1779 the first instruction that the scheduler has moved from
1780 the body to the prologue.
1782 In order to make sure that we scan all of the prologue
1783 instructions, we use a slightly less accurate mechanism which
1784 may scan more than necessary. To help compensate for this
1785 lack of accuracy, the prologue scanning loop below contains
1786 several clauses which'll cause the loop to terminate early if
1787 an implausible prologue instruction is encountered.
1793 is a suitable endpoint since it accounts for the largest
1794 possible prologue plus up to five instructions inserted by
1797 if (prologue_end
> prologue_start
+ 64)
1799 prologue_end
= prologue_start
+ 64; /* See above. */
1804 /* We have no symbol information. Our only option is to assume this
1805 function has a standard stack frame and the normal frame register.
1806 Then, we can find the value of our frame pointer on entrance to
1807 the callee (or at the present moment if this is the innermost frame).
1808 The value stored there should be the address of the stmfd + 8. */
1809 CORE_ADDR frame_loc
;
1810 LONGEST return_value
;
1812 frame_loc
= get_frame_register_unsigned (this_frame
, ARM_FP_REGNUM
);
1813 if (!safe_read_memory_integer (frame_loc
, 4, byte_order
, &return_value
))
1817 prologue_start
= gdbarch_addr_bits_remove
1818 (gdbarch
, return_value
) - 8;
1819 prologue_end
= prologue_start
+ 64; /* See above. */
1823 if (prev_pc
< prologue_end
)
1824 prologue_end
= prev_pc
;
1826 arm_analyze_prologue (gdbarch
, prologue_start
, prologue_end
, cache
);
1829 static struct arm_prologue_cache
*
1830 arm_make_prologue_cache (struct frame_info
*this_frame
)
1833 struct arm_prologue_cache
*cache
;
1834 CORE_ADDR unwound_fp
;
1836 cache
= FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache
);
1837 cache
->saved_regs
= trad_frame_alloc_saved_regs (this_frame
);
1839 arm_scan_prologue (this_frame
, cache
);
1841 unwound_fp
= get_frame_register_unsigned (this_frame
, cache
->framereg
);
1842 if (unwound_fp
== 0)
1845 cache
->prev_sp
= unwound_fp
+ cache
->framesize
;
1847 /* Calculate actual addresses of saved registers using offsets
1848 determined by arm_scan_prologue. */
1849 for (reg
= 0; reg
< gdbarch_num_regs (get_frame_arch (this_frame
)); reg
++)
1850 if (trad_frame_addr_p (cache
->saved_regs
, reg
))
1851 cache
->saved_regs
[reg
].addr
+= cache
->prev_sp
;
1856 /* Implementation of the stop_reason hook for arm_prologue frames. */
1858 static enum unwind_stop_reason
1859 arm_prologue_unwind_stop_reason (struct frame_info
*this_frame
,
1862 struct arm_prologue_cache
*cache
;
1865 if (*this_cache
== NULL
)
1866 *this_cache
= arm_make_prologue_cache (this_frame
);
1867 cache
= (struct arm_prologue_cache
*) *this_cache
;
1869 /* This is meant to halt the backtrace at "_start". */
1870 pc
= get_frame_pc (this_frame
);
1871 if (pc
<= gdbarch_tdep (get_frame_arch (this_frame
))->lowest_pc
)
1872 return UNWIND_OUTERMOST
;
1874 /* If we've hit a wall, stop. */
1875 if (cache
->prev_sp
== 0)
1876 return UNWIND_OUTERMOST
;
1878 return UNWIND_NO_REASON
;
1881 /* Our frame ID for a normal frame is the current function's starting PC
1882 and the caller's SP when we were called. */
1885 arm_prologue_this_id (struct frame_info
*this_frame
,
1887 struct frame_id
*this_id
)
1889 struct arm_prologue_cache
*cache
;
1893 if (*this_cache
== NULL
)
1894 *this_cache
= arm_make_prologue_cache (this_frame
);
1895 cache
= (struct arm_prologue_cache
*) *this_cache
;
1897 /* Use function start address as part of the frame ID. If we cannot
1898 identify the start address (due to missing symbol information),
1899 fall back to just using the current PC. */
1900 pc
= get_frame_pc (this_frame
);
1901 func
= get_frame_func (this_frame
);
1905 id
= frame_id_build (cache
->prev_sp
, func
);
1909 static struct value
*
1910 arm_prologue_prev_register (struct frame_info
*this_frame
,
1914 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
1915 struct arm_prologue_cache
*cache
;
1917 if (*this_cache
== NULL
)
1918 *this_cache
= arm_make_prologue_cache (this_frame
);
1919 cache
= (struct arm_prologue_cache
*) *this_cache
;
1921 /* If we are asked to unwind the PC, then we need to return the LR
1922 instead. The prologue may save PC, but it will point into this
1923 frame's prologue, not the next frame's resume location. Also
1924 strip the saved T bit. A valid LR may have the low bit set, but
1925 a valid PC never does. */
1926 if (prev_regnum
== ARM_PC_REGNUM
)
1930 lr
= frame_unwind_register_unsigned (this_frame
, ARM_LR_REGNUM
);
1931 return frame_unwind_got_constant (this_frame
, prev_regnum
,
1932 arm_addr_bits_remove (gdbarch
, lr
));
1935 /* SP is generally not saved to the stack, but this frame is
1936 identified by the next frame's stack pointer at the time of the call.
1937 The value was already reconstructed into PREV_SP. */
1938 if (prev_regnum
== ARM_SP_REGNUM
)
1939 return frame_unwind_got_constant (this_frame
, prev_regnum
, cache
->prev_sp
);
1941 /* The CPSR may have been changed by the call instruction and by the
1942 called function. The only bit we can reconstruct is the T bit,
1943 by checking the low bit of LR as of the call. This is a reliable
1944 indicator of Thumb-ness except for some ARM v4T pre-interworking
1945 Thumb code, which could get away with a clear low bit as long as
1946 the called function did not use bx. Guess that all other
1947 bits are unchanged; the condition flags are presumably lost,
1948 but the processor status is likely valid. */
1949 if (prev_regnum
== ARM_PS_REGNUM
)
1952 ULONGEST t_bit
= arm_psr_thumb_bit (gdbarch
);
1954 cpsr
= get_frame_register_unsigned (this_frame
, prev_regnum
);
1955 lr
= frame_unwind_register_unsigned (this_frame
, ARM_LR_REGNUM
);
1956 if (IS_THUMB_ADDR (lr
))
1960 return frame_unwind_got_constant (this_frame
, prev_regnum
, cpsr
);
1963 return trad_frame_get_prev_register (this_frame
, cache
->saved_regs
,
1967 struct frame_unwind arm_prologue_unwind
= {
1969 arm_prologue_unwind_stop_reason
,
1970 arm_prologue_this_id
,
1971 arm_prologue_prev_register
,
1973 default_frame_sniffer
1976 /* Maintain a list of ARM exception table entries per objfile, similar to the
1977 list of mapping symbols. We only cache entries for standard ARM-defined
1978 personality routines; the cache will contain only the frame unwinding
1979 instructions associated with the entry (not the descriptors). */
1981 static const struct objfile_data
*arm_exidx_data_key
;
1983 struct arm_exidx_entry
1988 typedef struct arm_exidx_entry arm_exidx_entry_s
;
1989 DEF_VEC_O(arm_exidx_entry_s
);
1991 struct arm_exidx_data
1993 VEC(arm_exidx_entry_s
) **section_maps
;
1997 arm_exidx_data_free (struct objfile
*objfile
, void *arg
)
1999 struct arm_exidx_data
*data
= (struct arm_exidx_data
*) arg
;
2002 for (i
= 0; i
< objfile
->obfd
->section_count
; i
++)
2003 VEC_free (arm_exidx_entry_s
, data
->section_maps
[i
]);
2007 arm_compare_exidx_entries (const struct arm_exidx_entry
*lhs
,
2008 const struct arm_exidx_entry
*rhs
)
2010 return lhs
->addr
< rhs
->addr
;
2013 static struct obj_section
*
2014 arm_obj_section_from_vma (struct objfile
*objfile
, bfd_vma vma
)
2016 struct obj_section
*osect
;
2018 ALL_OBJFILE_OSECTIONS (objfile
, osect
)
2019 if (bfd_get_section_flags (objfile
->obfd
,
2020 osect
->the_bfd_section
) & SEC_ALLOC
)
2022 bfd_vma start
, size
;
2023 start
= bfd_get_section_vma (objfile
->obfd
, osect
->the_bfd_section
);
2024 size
= bfd_get_section_size (osect
->the_bfd_section
);
2026 if (start
<= vma
&& vma
< start
+ size
)
2033 /* Parse contents of exception table and exception index sections
2034 of OBJFILE, and fill in the exception table entry cache.
2036 For each entry that refers to a standard ARM-defined personality
2037 routine, extract the frame unwinding instructions (from either
2038 the index or the table section). The unwinding instructions
2040 - extracting them from the rest of the table data
2041 - converting to host endianness
2042 - appending the implicit 0xb0 ("Finish") code
2044 The extracted and normalized instructions are stored for later
2045 retrieval by the arm_find_exidx_entry routine. */
2048 arm_exidx_new_objfile (struct objfile
*objfile
)
2050 struct cleanup
*cleanups
;
2051 struct arm_exidx_data
*data
;
2052 asection
*exidx
, *extab
;
2053 bfd_vma exidx_vma
= 0, extab_vma
= 0;
2054 bfd_size_type exidx_size
= 0, extab_size
= 0;
2055 gdb_byte
*exidx_data
= NULL
, *extab_data
= NULL
;
2058 /* If we've already touched this file, do nothing. */
2059 if (!objfile
|| objfile_data (objfile
, arm_exidx_data_key
) != NULL
)
2061 cleanups
= make_cleanup (null_cleanup
, NULL
);
2063 /* Read contents of exception table and index. */
2064 exidx
= bfd_get_section_by_name (objfile
->obfd
, ELF_STRING_ARM_unwind
);
2067 exidx_vma
= bfd_section_vma (objfile
->obfd
, exidx
);
2068 exidx_size
= bfd_get_section_size (exidx
);
2069 exidx_data
= (gdb_byte
*) xmalloc (exidx_size
);
2070 make_cleanup (xfree
, exidx_data
);
2072 if (!bfd_get_section_contents (objfile
->obfd
, exidx
,
2073 exidx_data
, 0, exidx_size
))
2075 do_cleanups (cleanups
);
2080 extab
= bfd_get_section_by_name (objfile
->obfd
, ".ARM.extab");
2083 extab_vma
= bfd_section_vma (objfile
->obfd
, extab
);
2084 extab_size
= bfd_get_section_size (extab
);
2085 extab_data
= (gdb_byte
*) xmalloc (extab_size
);
2086 make_cleanup (xfree
, extab_data
);
2088 if (!bfd_get_section_contents (objfile
->obfd
, extab
,
2089 extab_data
, 0, extab_size
))
2091 do_cleanups (cleanups
);
2096 /* Allocate exception table data structure. */
2097 data
= OBSTACK_ZALLOC (&objfile
->objfile_obstack
, struct arm_exidx_data
);
2098 set_objfile_data (objfile
, arm_exidx_data_key
, data
);
2099 data
->section_maps
= OBSTACK_CALLOC (&objfile
->objfile_obstack
,
2100 objfile
->obfd
->section_count
,
2101 VEC(arm_exidx_entry_s
) *);
2103 /* Fill in exception table. */
2104 for (i
= 0; i
< exidx_size
/ 8; i
++)
2106 struct arm_exidx_entry new_exidx_entry
;
2107 bfd_vma idx
= bfd_h_get_32 (objfile
->obfd
, exidx_data
+ i
* 8);
2108 bfd_vma val
= bfd_h_get_32 (objfile
->obfd
, exidx_data
+ i
* 8 + 4);
2109 bfd_vma addr
= 0, word
= 0;
2110 int n_bytes
= 0, n_words
= 0;
2111 struct obj_section
*sec
;
2112 gdb_byte
*entry
= NULL
;
2114 /* Extract address of start of function. */
2115 idx
= ((idx
& 0x7fffffff) ^ 0x40000000) - 0x40000000;
2116 idx
+= exidx_vma
+ i
* 8;
2118 /* Find section containing function and compute section offset. */
2119 sec
= arm_obj_section_from_vma (objfile
, idx
);
2122 idx
-= bfd_get_section_vma (objfile
->obfd
, sec
->the_bfd_section
);
2124 /* Determine address of exception table entry. */
2127 /* EXIDX_CANTUNWIND -- no exception table entry present. */
2129 else if ((val
& 0xff000000) == 0x80000000)
2131 /* Exception table entry embedded in .ARM.exidx
2132 -- must be short form. */
2136 else if (!(val
& 0x80000000))
2138 /* Exception table entry in .ARM.extab. */
2139 addr
= ((val
& 0x7fffffff) ^ 0x40000000) - 0x40000000;
2140 addr
+= exidx_vma
+ i
* 8 + 4;
2142 if (addr
>= extab_vma
&& addr
+ 4 <= extab_vma
+ extab_size
)
2144 word
= bfd_h_get_32 (objfile
->obfd
,
2145 extab_data
+ addr
- extab_vma
);
2148 if ((word
& 0xff000000) == 0x80000000)
2153 else if ((word
& 0xff000000) == 0x81000000
2154 || (word
& 0xff000000) == 0x82000000)
2158 n_words
= ((word
>> 16) & 0xff);
2160 else if (!(word
& 0x80000000))
2163 struct obj_section
*pers_sec
;
2164 int gnu_personality
= 0;
2166 /* Custom personality routine. */
2167 pers
= ((word
& 0x7fffffff) ^ 0x40000000) - 0x40000000;
2168 pers
= UNMAKE_THUMB_ADDR (pers
+ addr
- 4);
2170 /* Check whether we've got one of the variants of the
2171 GNU personality routines. */
2172 pers_sec
= arm_obj_section_from_vma (objfile
, pers
);
2175 static const char *personality
[] =
2177 "__gcc_personality_v0",
2178 "__gxx_personality_v0",
2179 "__gcj_personality_v0",
2180 "__gnu_objc_personality_v0",
2184 CORE_ADDR pc
= pers
+ obj_section_offset (pers_sec
);
2187 for (k
= 0; personality
[k
]; k
++)
2188 if (lookup_minimal_symbol_by_pc_name
2189 (pc
, personality
[k
], objfile
))
2191 gnu_personality
= 1;
2196 /* If so, the next word contains a word count in the high
2197 byte, followed by the same unwind instructions as the
2198 pre-defined forms. */
2200 && addr
+ 4 <= extab_vma
+ extab_size
)
2202 word
= bfd_h_get_32 (objfile
->obfd
,
2203 extab_data
+ addr
- extab_vma
);
2206 n_words
= ((word
>> 24) & 0xff);
2212 /* Sanity check address. */
2214 if (addr
< extab_vma
|| addr
+ 4 * n_words
> extab_vma
+ extab_size
)
2215 n_words
= n_bytes
= 0;
2217 /* The unwind instructions reside in WORD (only the N_BYTES least
2218 significant bytes are valid), followed by N_WORDS words in the
2219 extab section starting at ADDR. */
2220 if (n_bytes
|| n_words
)
2223 = (gdb_byte
*) obstack_alloc (&objfile
->objfile_obstack
,
2224 n_bytes
+ n_words
* 4 + 1);
2227 *p
++ = (gdb_byte
) ((word
>> (8 * n_bytes
)) & 0xff);
2231 word
= bfd_h_get_32 (objfile
->obfd
,
2232 extab_data
+ addr
- extab_vma
);
2235 *p
++ = (gdb_byte
) ((word
>> 24) & 0xff);
2236 *p
++ = (gdb_byte
) ((word
>> 16) & 0xff);
2237 *p
++ = (gdb_byte
) ((word
>> 8) & 0xff);
2238 *p
++ = (gdb_byte
) (word
& 0xff);
2241 /* Implied "Finish" to terminate the list. */
2245 /* Push entry onto vector. They are guaranteed to always
2246 appear in order of increasing addresses. */
2247 new_exidx_entry
.addr
= idx
;
2248 new_exidx_entry
.entry
= entry
;
2249 VEC_safe_push (arm_exidx_entry_s
,
2250 data
->section_maps
[sec
->the_bfd_section
->index
],
2254 do_cleanups (cleanups
);
2257 /* Search for the exception table entry covering MEMADDR. If one is found,
2258 return a pointer to its data. Otherwise, return 0. If START is non-NULL,
2259 set *START to the start of the region covered by this entry. */
2262 arm_find_exidx_entry (CORE_ADDR memaddr
, CORE_ADDR
*start
)
2264 struct obj_section
*sec
;
2266 sec
= find_pc_section (memaddr
);
2269 struct arm_exidx_data
*data
;
2270 VEC(arm_exidx_entry_s
) *map
;
2271 struct arm_exidx_entry map_key
= { memaddr
- obj_section_addr (sec
), 0 };
2274 data
= ((struct arm_exidx_data
*)
2275 objfile_data (sec
->objfile
, arm_exidx_data_key
));
2278 map
= data
->section_maps
[sec
->the_bfd_section
->index
];
2279 if (!VEC_empty (arm_exidx_entry_s
, map
))
2281 struct arm_exidx_entry
*map_sym
;
2283 idx
= VEC_lower_bound (arm_exidx_entry_s
, map
, &map_key
,
2284 arm_compare_exidx_entries
);
2286 /* VEC_lower_bound finds the earliest ordered insertion
2287 point. If the following symbol starts at this exact
2288 address, we use that; otherwise, the preceding
2289 exception table entry covers this address. */
2290 if (idx
< VEC_length (arm_exidx_entry_s
, map
))
2292 map_sym
= VEC_index (arm_exidx_entry_s
, map
, idx
);
2293 if (map_sym
->addr
== map_key
.addr
)
2296 *start
= map_sym
->addr
+ obj_section_addr (sec
);
2297 return map_sym
->entry
;
2303 map_sym
= VEC_index (arm_exidx_entry_s
, map
, idx
- 1);
2305 *start
= map_sym
->addr
+ obj_section_addr (sec
);
2306 return map_sym
->entry
;
2315 /* Given the current frame THIS_FRAME, and its associated frame unwinding
2316 instruction list from the ARM exception table entry ENTRY, allocate and
2317 return a prologue cache structure describing how to unwind this frame.
2319 Return NULL if the unwinding instruction list contains a "spare",
2320 "reserved" or "refuse to unwind" instruction as defined in section
2321 "9.3 Frame unwinding instructions" of the "Exception Handling ABI
2322 for the ARM Architecture" document. */
2324 static struct arm_prologue_cache
*
2325 arm_exidx_fill_cache (struct frame_info
*this_frame
, gdb_byte
*entry
)
2330 struct arm_prologue_cache
*cache
;
2331 cache
= FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache
);
2332 cache
->saved_regs
= trad_frame_alloc_saved_regs (this_frame
);
2338 /* Whenever we reload SP, we actually have to retrieve its
2339 actual value in the current frame. */
2342 if (trad_frame_realreg_p (cache
->saved_regs
, ARM_SP_REGNUM
))
2344 int reg
= cache
->saved_regs
[ARM_SP_REGNUM
].realreg
;
2345 vsp
= get_frame_register_unsigned (this_frame
, reg
);
2349 CORE_ADDR addr
= cache
->saved_regs
[ARM_SP_REGNUM
].addr
;
2350 vsp
= get_frame_memory_unsigned (this_frame
, addr
, 4);
2356 /* Decode next unwind instruction. */
2359 if ((insn
& 0xc0) == 0)
2361 int offset
= insn
& 0x3f;
2362 vsp
+= (offset
<< 2) + 4;
2364 else if ((insn
& 0xc0) == 0x40)
2366 int offset
= insn
& 0x3f;
2367 vsp
-= (offset
<< 2) + 4;
2369 else if ((insn
& 0xf0) == 0x80)
2371 int mask
= ((insn
& 0xf) << 8) | *entry
++;
2374 /* The special case of an all-zero mask identifies
2375 "Refuse to unwind". We return NULL to fall back
2376 to the prologue analyzer. */
2380 /* Pop registers r4..r15 under mask. */
2381 for (i
= 0; i
< 12; i
++)
2382 if (mask
& (1 << i
))
2384 cache
->saved_regs
[4 + i
].addr
= vsp
;
2388 /* Special-case popping SP -- we need to reload vsp. */
2389 if (mask
& (1 << (ARM_SP_REGNUM
- 4)))
2392 else if ((insn
& 0xf0) == 0x90)
2394 int reg
= insn
& 0xf;
2396 /* Reserved cases. */
2397 if (reg
== ARM_SP_REGNUM
|| reg
== ARM_PC_REGNUM
)
2400 /* Set SP from another register and mark VSP for reload. */
2401 cache
->saved_regs
[ARM_SP_REGNUM
] = cache
->saved_regs
[reg
];
2404 else if ((insn
& 0xf0) == 0xa0)
2406 int count
= insn
& 0x7;
2407 int pop_lr
= (insn
& 0x8) != 0;
2410 /* Pop r4..r[4+count]. */
2411 for (i
= 0; i
<= count
; i
++)
2413 cache
->saved_regs
[4 + i
].addr
= vsp
;
2417 /* If indicated by flag, pop LR as well. */
2420 cache
->saved_regs
[ARM_LR_REGNUM
].addr
= vsp
;
2424 else if (insn
== 0xb0)
2426 /* We could only have updated PC by popping into it; if so, it
2427 will show up as address. Otherwise, copy LR into PC. */
2428 if (!trad_frame_addr_p (cache
->saved_regs
, ARM_PC_REGNUM
))
2429 cache
->saved_regs
[ARM_PC_REGNUM
]
2430 = cache
->saved_regs
[ARM_LR_REGNUM
];
2435 else if (insn
== 0xb1)
2437 int mask
= *entry
++;
2440 /* All-zero mask and mask >= 16 is "spare". */
2441 if (mask
== 0 || mask
>= 16)
2444 /* Pop r0..r3 under mask. */
2445 for (i
= 0; i
< 4; i
++)
2446 if (mask
& (1 << i
))
2448 cache
->saved_regs
[i
].addr
= vsp
;
2452 else if (insn
== 0xb2)
2454 ULONGEST offset
= 0;
2459 offset
|= (*entry
& 0x7f) << shift
;
2462 while (*entry
++ & 0x80);
2464 vsp
+= 0x204 + (offset
<< 2);
2466 else if (insn
== 0xb3)
2468 int start
= *entry
>> 4;
2469 int count
= (*entry
++) & 0xf;
2472 /* Only registers D0..D15 are valid here. */
2473 if (start
+ count
>= 16)
2476 /* Pop VFP double-precision registers D[start]..D[start+count]. */
2477 for (i
= 0; i
<= count
; i
++)
2479 cache
->saved_regs
[ARM_D0_REGNUM
+ start
+ i
].addr
= vsp
;
2483 /* Add an extra 4 bytes for FSTMFDX-style stack. */
2486 else if ((insn
& 0xf8) == 0xb8)
2488 int count
= insn
& 0x7;
2491 /* Pop VFP double-precision registers D[8]..D[8+count]. */
2492 for (i
= 0; i
<= count
; i
++)
2494 cache
->saved_regs
[ARM_D0_REGNUM
+ 8 + i
].addr
= vsp
;
2498 /* Add an extra 4 bytes for FSTMFDX-style stack. */
2501 else if (insn
== 0xc6)
2503 int start
= *entry
>> 4;
2504 int count
= (*entry
++) & 0xf;
2507 /* Only registers WR0..WR15 are valid. */
2508 if (start
+ count
>= 16)
2511 /* Pop iwmmx registers WR[start]..WR[start+count]. */
2512 for (i
= 0; i
<= count
; i
++)
2514 cache
->saved_regs
[ARM_WR0_REGNUM
+ start
+ i
].addr
= vsp
;
2518 else if (insn
== 0xc7)
2520 int mask
= *entry
++;
2523 /* All-zero mask and mask >= 16 is "spare". */
2524 if (mask
== 0 || mask
>= 16)
2527 /* Pop iwmmx general-purpose registers WCGR0..WCGR3 under mask. */
2528 for (i
= 0; i
< 4; i
++)
2529 if (mask
& (1 << i
))
2531 cache
->saved_regs
[ARM_WCGR0_REGNUM
+ i
].addr
= vsp
;
2535 else if ((insn
& 0xf8) == 0xc0)
2537 int count
= insn
& 0x7;
2540 /* Pop iwmmx registers WR[10]..WR[10+count]. */
2541 for (i
= 0; i
<= count
; i
++)
2543 cache
->saved_regs
[ARM_WR0_REGNUM
+ 10 + i
].addr
= vsp
;
2547 else if (insn
== 0xc8)
2549 int start
= *entry
>> 4;
2550 int count
= (*entry
++) & 0xf;
2553 /* Only registers D0..D31 are valid. */
2554 if (start
+ count
>= 16)
2557 /* Pop VFP double-precision registers
2558 D[16+start]..D[16+start+count]. */
2559 for (i
= 0; i
<= count
; i
++)
2561 cache
->saved_regs
[ARM_D0_REGNUM
+ 16 + start
+ i
].addr
= vsp
;
2565 else if (insn
== 0xc9)
2567 int start
= *entry
>> 4;
2568 int count
= (*entry
++) & 0xf;
2571 /* Pop VFP double-precision registers D[start]..D[start+count]. */
2572 for (i
= 0; i
<= count
; i
++)
2574 cache
->saved_regs
[ARM_D0_REGNUM
+ start
+ i
].addr
= vsp
;
2578 else if ((insn
& 0xf8) == 0xd0)
2580 int count
= insn
& 0x7;
2583 /* Pop VFP double-precision registers D[8]..D[8+count]. */
2584 for (i
= 0; i
<= count
; i
++)
2586 cache
->saved_regs
[ARM_D0_REGNUM
+ 8 + i
].addr
= vsp
;
2592 /* Everything else is "spare". */
2597 /* If we restore SP from a register, assume this was the frame register.
2598 Otherwise just fall back to SP as frame register. */
2599 if (trad_frame_realreg_p (cache
->saved_regs
, ARM_SP_REGNUM
))
2600 cache
->framereg
= cache
->saved_regs
[ARM_SP_REGNUM
].realreg
;
2602 cache
->framereg
= ARM_SP_REGNUM
;
2604 /* Determine offset to previous frame. */
2606 = vsp
- get_frame_register_unsigned (this_frame
, cache
->framereg
);
2608 /* We already got the previous SP. */
2609 cache
->prev_sp
= vsp
;
2614 /* Unwinding via ARM exception table entries. Note that the sniffer
2615 already computes a filled-in prologue cache, which is then used
2616 with the same arm_prologue_this_id and arm_prologue_prev_register
2617 routines also used for prologue-parsing based unwinding. */
2620 arm_exidx_unwind_sniffer (const struct frame_unwind
*self
,
2621 struct frame_info
*this_frame
,
2622 void **this_prologue_cache
)
2624 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
2625 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
2626 CORE_ADDR addr_in_block
, exidx_region
, func_start
;
2627 struct arm_prologue_cache
*cache
;
2630 /* See if we have an ARM exception table entry covering this address. */
2631 addr_in_block
= get_frame_address_in_block (this_frame
);
2632 entry
= arm_find_exidx_entry (addr_in_block
, &exidx_region
);
2636 /* The ARM exception table does not describe unwind information
2637 for arbitrary PC values, but is guaranteed to be correct only
2638 at call sites. We have to decide here whether we want to use
2639 ARM exception table information for this frame, or fall back
2640 to using prologue parsing. (Note that if we have DWARF CFI,
2641 this sniffer isn't even called -- CFI is always preferred.)
2643 Before we make this decision, however, we check whether we
2644 actually have *symbol* information for the current frame.
2645 If not, prologue parsing would not work anyway, so we might
2646 as well use the exception table and hope for the best. */
2647 if (find_pc_partial_function (addr_in_block
, NULL
, &func_start
, NULL
))
2651 /* If the next frame is "normal", we are at a call site in this
2652 frame, so exception information is guaranteed to be valid. */
2653 if (get_next_frame (this_frame
)
2654 && get_frame_type (get_next_frame (this_frame
)) == NORMAL_FRAME
)
2657 /* We also assume exception information is valid if we're currently
2658 blocked in a system call. The system library is supposed to
2659 ensure this, so that e.g. pthread cancellation works. */
2660 if (arm_frame_is_thumb (this_frame
))
2664 if (safe_read_memory_integer (get_frame_pc (this_frame
) - 2, 2,
2665 byte_order_for_code
, &insn
)
2666 && (insn
& 0xff00) == 0xdf00 /* svc */)
2673 if (safe_read_memory_integer (get_frame_pc (this_frame
) - 4, 4,
2674 byte_order_for_code
, &insn
)
2675 && (insn
& 0x0f000000) == 0x0f000000 /* svc */)
2679 /* Bail out if we don't know that exception information is valid. */
2683 /* The ARM exception index does not mark the *end* of the region
2684 covered by the entry, and some functions will not have any entry.
2685 To correctly recognize the end of the covered region, the linker
2686 should have inserted dummy records with a CANTUNWIND marker.
2688 Unfortunately, current versions of GNU ld do not reliably do
2689 this, and thus we may have found an incorrect entry above.
2690 As a (temporary) sanity check, we only use the entry if it
2691 lies *within* the bounds of the function. Note that this check
2692 might reject perfectly valid entries that just happen to cover
2693 multiple functions; therefore this check ought to be removed
2694 once the linker is fixed. */
2695 if (func_start
> exidx_region
)
2699 /* Decode the list of unwinding instructions into a prologue cache.
2700 Note that this may fail due to e.g. a "refuse to unwind" code. */
2701 cache
= arm_exidx_fill_cache (this_frame
, entry
);
2705 *this_prologue_cache
= cache
;
2709 struct frame_unwind arm_exidx_unwind
= {
2711 default_frame_unwind_stop_reason
,
2712 arm_prologue_this_id
,
2713 arm_prologue_prev_register
,
2715 arm_exidx_unwind_sniffer
2718 static struct arm_prologue_cache
*
2719 arm_make_epilogue_frame_cache (struct frame_info
*this_frame
)
2721 struct arm_prologue_cache
*cache
;
2724 cache
= FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache
);
2725 cache
->saved_regs
= trad_frame_alloc_saved_regs (this_frame
);
2727 /* Still rely on the offset calculated from prologue. */
2728 arm_scan_prologue (this_frame
, cache
);
2730 /* Since we are in epilogue, the SP has been restored. */
2731 cache
->prev_sp
= get_frame_register_unsigned (this_frame
, ARM_SP_REGNUM
);
2733 /* Calculate actual addresses of saved registers using offsets
2734 determined by arm_scan_prologue. */
2735 for (reg
= 0; reg
< gdbarch_num_regs (get_frame_arch (this_frame
)); reg
++)
2736 if (trad_frame_addr_p (cache
->saved_regs
, reg
))
2737 cache
->saved_regs
[reg
].addr
+= cache
->prev_sp
;
2742 /* Implementation of function hook 'this_id' in
2743 'struct frame_uwnind' for epilogue unwinder. */
2746 arm_epilogue_frame_this_id (struct frame_info
*this_frame
,
2748 struct frame_id
*this_id
)
2750 struct arm_prologue_cache
*cache
;
2753 if (*this_cache
== NULL
)
2754 *this_cache
= arm_make_epilogue_frame_cache (this_frame
);
2755 cache
= (struct arm_prologue_cache
*) *this_cache
;
2757 /* Use function start address as part of the frame ID. If we cannot
2758 identify the start address (due to missing symbol information),
2759 fall back to just using the current PC. */
2760 pc
= get_frame_pc (this_frame
);
2761 func
= get_frame_func (this_frame
);
2765 (*this_id
) = frame_id_build (cache
->prev_sp
, pc
);
2768 /* Implementation of function hook 'prev_register' in
2769 'struct frame_uwnind' for epilogue unwinder. */
2771 static struct value
*
2772 arm_epilogue_frame_prev_register (struct frame_info
*this_frame
,
2773 void **this_cache
, int regnum
)
2775 if (*this_cache
== NULL
)
2776 *this_cache
= arm_make_epilogue_frame_cache (this_frame
);
2778 return arm_prologue_prev_register (this_frame
, this_cache
, regnum
);
2781 static int arm_stack_frame_destroyed_p_1 (struct gdbarch
*gdbarch
,
2783 static int thumb_stack_frame_destroyed_p (struct gdbarch
*gdbarch
,
2786 /* Implementation of function hook 'sniffer' in
2787 'struct frame_uwnind' for epilogue unwinder. */
2790 arm_epilogue_frame_sniffer (const struct frame_unwind
*self
,
2791 struct frame_info
*this_frame
,
2792 void **this_prologue_cache
)
2794 if (frame_relative_level (this_frame
) == 0)
2796 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
2797 CORE_ADDR pc
= get_frame_pc (this_frame
);
2799 if (arm_frame_is_thumb (this_frame
))
2800 return thumb_stack_frame_destroyed_p (gdbarch
, pc
);
2802 return arm_stack_frame_destroyed_p_1 (gdbarch
, pc
);
2808 /* Frame unwinder from epilogue. */
2810 static const struct frame_unwind arm_epilogue_frame_unwind
=
2813 default_frame_unwind_stop_reason
,
2814 arm_epilogue_frame_this_id
,
2815 arm_epilogue_frame_prev_register
,
2817 arm_epilogue_frame_sniffer
,
2820 /* Recognize GCC's trampoline for thumb call-indirect. If we are in a
2821 trampoline, return the target PC. Otherwise return 0.
2823 void call0a (char c, short s, int i, long l) {}
2827 (*pointer_to_call0a) (c, s, i, l);
2830 Instead of calling a stub library function _call_via_xx (xx is
2831 the register name), GCC may inline the trampoline in the object
2832 file as below (register r2 has the address of call0a).
2835 .type main, %function
2844 The trampoline 'bx r2' doesn't belong to main. */
2847 arm_skip_bx_reg (struct frame_info
*frame
, CORE_ADDR pc
)
2849 /* The heuristics of recognizing such trampoline is that FRAME is
2850 executing in Thumb mode and the instruction on PC is 'bx Rm'. */
2851 if (arm_frame_is_thumb (frame
))
2855 if (target_read_memory (pc
, buf
, 2) == 0)
2857 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
2858 enum bfd_endian byte_order_for_code
2859 = gdbarch_byte_order_for_code (gdbarch
);
2861 = extract_unsigned_integer (buf
, 2, byte_order_for_code
);
2863 if ((insn
& 0xff80) == 0x4700) /* bx <Rm> */
2866 = get_frame_register_unsigned (frame
, bits (insn
, 3, 6));
2868 /* Clear the LSB so that gdb core sets step-resume
2869 breakpoint at the right address. */
2870 return UNMAKE_THUMB_ADDR (dest
);
2878 static struct arm_prologue_cache
*
2879 arm_make_stub_cache (struct frame_info
*this_frame
)
2881 struct arm_prologue_cache
*cache
;
2883 cache
= FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache
);
2884 cache
->saved_regs
= trad_frame_alloc_saved_regs (this_frame
);
2886 cache
->prev_sp
= get_frame_register_unsigned (this_frame
, ARM_SP_REGNUM
);
2891 /* Our frame ID for a stub frame is the current SP and LR. */
2894 arm_stub_this_id (struct frame_info
*this_frame
,
2896 struct frame_id
*this_id
)
2898 struct arm_prologue_cache
*cache
;
2900 if (*this_cache
== NULL
)
2901 *this_cache
= arm_make_stub_cache (this_frame
);
2902 cache
= (struct arm_prologue_cache
*) *this_cache
;
2904 *this_id
= frame_id_build (cache
->prev_sp
, get_frame_pc (this_frame
));
2908 arm_stub_unwind_sniffer (const struct frame_unwind
*self
,
2909 struct frame_info
*this_frame
,
2910 void **this_prologue_cache
)
2912 CORE_ADDR addr_in_block
;
2914 CORE_ADDR pc
, start_addr
;
2917 addr_in_block
= get_frame_address_in_block (this_frame
);
2918 pc
= get_frame_pc (this_frame
);
2919 if (in_plt_section (addr_in_block
)
2920 /* We also use the stub winder if the target memory is unreadable
2921 to avoid having the prologue unwinder trying to read it. */
2922 || target_read_memory (pc
, dummy
, 4) != 0)
2925 if (find_pc_partial_function (pc
, &name
, &start_addr
, NULL
) == 0
2926 && arm_skip_bx_reg (this_frame
, pc
) != 0)
2932 struct frame_unwind arm_stub_unwind
= {
2934 default_frame_unwind_stop_reason
,
2936 arm_prologue_prev_register
,
2938 arm_stub_unwind_sniffer
2941 /* Put here the code to store, into CACHE->saved_regs, the addresses
2942 of the saved registers of frame described by THIS_FRAME. CACHE is
2945 static struct arm_prologue_cache
*
2946 arm_m_exception_cache (struct frame_info
*this_frame
)
2948 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
2949 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2950 struct arm_prologue_cache
*cache
;
2951 CORE_ADDR unwound_sp
;
2954 cache
= FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache
);
2955 cache
->saved_regs
= trad_frame_alloc_saved_regs (this_frame
);
2957 unwound_sp
= get_frame_register_unsigned (this_frame
,
2960 /* The hardware saves eight 32-bit words, comprising xPSR,
2961 ReturnAddress, LR (R14), R12, R3, R2, R1, R0. See details in
2962 "B1.5.6 Exception entry behavior" in
2963 "ARMv7-M Architecture Reference Manual". */
2964 cache
->saved_regs
[0].addr
= unwound_sp
;
2965 cache
->saved_regs
[1].addr
= unwound_sp
+ 4;
2966 cache
->saved_regs
[2].addr
= unwound_sp
+ 8;
2967 cache
->saved_regs
[3].addr
= unwound_sp
+ 12;
2968 cache
->saved_regs
[12].addr
= unwound_sp
+ 16;
2969 cache
->saved_regs
[14].addr
= unwound_sp
+ 20;
2970 cache
->saved_regs
[15].addr
= unwound_sp
+ 24;
2971 cache
->saved_regs
[ARM_PS_REGNUM
].addr
= unwound_sp
+ 28;
2973 /* If bit 9 of the saved xPSR is set, then there is a four-byte
2974 aligner between the top of the 32-byte stack frame and the
2975 previous context's stack pointer. */
2976 cache
->prev_sp
= unwound_sp
+ 32;
2977 if (safe_read_memory_integer (unwound_sp
+ 28, 4, byte_order
, &xpsr
)
2978 && (xpsr
& (1 << 9)) != 0)
2979 cache
->prev_sp
+= 4;
2984 /* Implementation of function hook 'this_id' in
2985 'struct frame_uwnind'. */
2988 arm_m_exception_this_id (struct frame_info
*this_frame
,
2990 struct frame_id
*this_id
)
2992 struct arm_prologue_cache
*cache
;
2994 if (*this_cache
== NULL
)
2995 *this_cache
= arm_m_exception_cache (this_frame
);
2996 cache
= (struct arm_prologue_cache
*) *this_cache
;
2998 /* Our frame ID for a stub frame is the current SP and LR. */
2999 *this_id
= frame_id_build (cache
->prev_sp
,
3000 get_frame_pc (this_frame
));
3003 /* Implementation of function hook 'prev_register' in
3004 'struct frame_uwnind'. */
3006 static struct value
*
3007 arm_m_exception_prev_register (struct frame_info
*this_frame
,
3011 struct arm_prologue_cache
*cache
;
3013 if (*this_cache
== NULL
)
3014 *this_cache
= arm_m_exception_cache (this_frame
);
3015 cache
= (struct arm_prologue_cache
*) *this_cache
;
3017 /* The value was already reconstructed into PREV_SP. */
3018 if (prev_regnum
== ARM_SP_REGNUM
)
3019 return frame_unwind_got_constant (this_frame
, prev_regnum
,
3022 return trad_frame_get_prev_register (this_frame
, cache
->saved_regs
,
3026 /* Implementation of function hook 'sniffer' in
3027 'struct frame_uwnind'. */
3030 arm_m_exception_unwind_sniffer (const struct frame_unwind
*self
,
3031 struct frame_info
*this_frame
,
3032 void **this_prologue_cache
)
3034 CORE_ADDR this_pc
= get_frame_pc (this_frame
);
3036 /* No need to check is_m; this sniffer is only registered for
3037 M-profile architectures. */
3039 /* Check if exception frame returns to a magic PC value. */
3040 return arm_m_addr_is_magic (this_pc
);
3043 /* Frame unwinder for M-profile exceptions. */
3045 struct frame_unwind arm_m_exception_unwind
=
3048 default_frame_unwind_stop_reason
,
3049 arm_m_exception_this_id
,
3050 arm_m_exception_prev_register
,
3052 arm_m_exception_unwind_sniffer
3056 arm_normal_frame_base (struct frame_info
*this_frame
, void **this_cache
)
3058 struct arm_prologue_cache
*cache
;
3060 if (*this_cache
== NULL
)
3061 *this_cache
= arm_make_prologue_cache (this_frame
);
3062 cache
= (struct arm_prologue_cache
*) *this_cache
;
3064 return cache
->prev_sp
- cache
->framesize
;
3067 struct frame_base arm_normal_base
= {
3068 &arm_prologue_unwind
,
3069 arm_normal_frame_base
,
3070 arm_normal_frame_base
,
3071 arm_normal_frame_base
3074 /* Assuming THIS_FRAME is a dummy, return the frame ID of that
3075 dummy frame. The frame ID's base needs to match the TOS value
3076 saved by save_dummy_frame_tos() and returned from
3077 arm_push_dummy_call, and the PC needs to match the dummy frame's
3080 static struct frame_id
3081 arm_dummy_id (struct gdbarch
*gdbarch
, struct frame_info
*this_frame
)
3083 return frame_id_build (get_frame_register_unsigned (this_frame
,
3085 get_frame_pc (this_frame
));
3088 /* Given THIS_FRAME, find the previous frame's resume PC (which will
3089 be used to construct the previous frame's ID, after looking up the
3090 containing function). */
3093 arm_unwind_pc (struct gdbarch
*gdbarch
, struct frame_info
*this_frame
)
3096 pc
= frame_unwind_register_unsigned (this_frame
, ARM_PC_REGNUM
);
3097 return arm_addr_bits_remove (gdbarch
, pc
);
3101 arm_unwind_sp (struct gdbarch
*gdbarch
, struct frame_info
*this_frame
)
3103 return frame_unwind_register_unsigned (this_frame
, ARM_SP_REGNUM
);
3106 static struct value
*
3107 arm_dwarf2_prev_register (struct frame_info
*this_frame
, void **this_cache
,
3110 struct gdbarch
* gdbarch
= get_frame_arch (this_frame
);
3112 ULONGEST t_bit
= arm_psr_thumb_bit (gdbarch
);
3117 /* The PC is normally copied from the return column, which
3118 describes saves of LR. However, that version may have an
3119 extra bit set to indicate Thumb state. The bit is not
3121 lr
= frame_unwind_register_unsigned (this_frame
, ARM_LR_REGNUM
);
3122 return frame_unwind_got_constant (this_frame
, regnum
,
3123 arm_addr_bits_remove (gdbarch
, lr
));
3126 /* Reconstruct the T bit; see arm_prologue_prev_register for details. */
3127 cpsr
= get_frame_register_unsigned (this_frame
, regnum
);
3128 lr
= frame_unwind_register_unsigned (this_frame
, ARM_LR_REGNUM
);
3129 if (IS_THUMB_ADDR (lr
))
3133 return frame_unwind_got_constant (this_frame
, regnum
, cpsr
);
3136 internal_error (__FILE__
, __LINE__
,
3137 _("Unexpected register %d"), regnum
);
3142 arm_dwarf2_frame_init_reg (struct gdbarch
*gdbarch
, int regnum
,
3143 struct dwarf2_frame_state_reg
*reg
,
3144 struct frame_info
*this_frame
)
3150 reg
->how
= DWARF2_FRAME_REG_FN
;
3151 reg
->loc
.fn
= arm_dwarf2_prev_register
;
3154 reg
->how
= DWARF2_FRAME_REG_CFA
;
3159 /* Implement the stack_frame_destroyed_p gdbarch method. */
3162 thumb_stack_frame_destroyed_p (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
3164 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
3165 unsigned int insn
, insn2
;
3166 int found_return
= 0, found_stack_adjust
= 0;
3167 CORE_ADDR func_start
, func_end
;
3171 if (!find_pc_partial_function (pc
, NULL
, &func_start
, &func_end
))
3174 /* The epilogue is a sequence of instructions along the following lines:
3176 - add stack frame size to SP or FP
3177 - [if frame pointer used] restore SP from FP
3178 - restore registers from SP [may include PC]
3179 - a return-type instruction [if PC wasn't already restored]
3181 In a first pass, we scan forward from the current PC and verify the
3182 instructions we find as compatible with this sequence, ending in a
3185 However, this is not sufficient to distinguish indirect function calls
3186 within a function from indirect tail calls in the epilogue in some cases.
3187 Therefore, if we didn't already find any SP-changing instruction during
3188 forward scan, we add a backward scanning heuristic to ensure we actually
3189 are in the epilogue. */
3192 while (scan_pc
< func_end
&& !found_return
)
3194 if (target_read_memory (scan_pc
, buf
, 2))
3198 insn
= extract_unsigned_integer (buf
, 2, byte_order_for_code
);
3200 if ((insn
& 0xff80) == 0x4700) /* bx <Rm> */
3202 else if (insn
== 0x46f7) /* mov pc, lr */
3204 else if (thumb_instruction_restores_sp (insn
))
3206 if ((insn
& 0xff00) == 0xbd00) /* pop <registers, PC> */
3209 else if (thumb_insn_size (insn
) == 4) /* 32-bit Thumb-2 instruction */
3211 if (target_read_memory (scan_pc
, buf
, 2))
3215 insn2
= extract_unsigned_integer (buf
, 2, byte_order_for_code
);
3217 if (insn
== 0xe8bd) /* ldm.w sp!, <registers> */
3219 if (insn2
& 0x8000) /* <registers> include PC. */
3222 else if (insn
== 0xf85d /* ldr.w <Rt>, [sp], #4 */
3223 && (insn2
& 0x0fff) == 0x0b04)
3225 if ((insn2
& 0xf000) == 0xf000) /* <Rt> is PC. */
3228 else if ((insn
& 0xffbf) == 0xecbd /* vldm sp!, <list> */
3229 && (insn2
& 0x0e00) == 0x0a00)
3241 /* Since any instruction in the epilogue sequence, with the possible
3242 exception of return itself, updates the stack pointer, we need to
3243 scan backwards for at most one instruction. Try either a 16-bit or
3244 a 32-bit instruction. This is just a heuristic, so we do not worry
3245 too much about false positives. */
3247 if (pc
- 4 < func_start
)
3249 if (target_read_memory (pc
- 4, buf
, 4))
3252 insn
= extract_unsigned_integer (buf
, 2, byte_order_for_code
);
3253 insn2
= extract_unsigned_integer (buf
+ 2, 2, byte_order_for_code
);
3255 if (thumb_instruction_restores_sp (insn2
))
3256 found_stack_adjust
= 1;
3257 else if (insn
== 0xe8bd) /* ldm.w sp!, <registers> */
3258 found_stack_adjust
= 1;
3259 else if (insn
== 0xf85d /* ldr.w <Rt>, [sp], #4 */
3260 && (insn2
& 0x0fff) == 0x0b04)
3261 found_stack_adjust
= 1;
3262 else if ((insn
& 0xffbf) == 0xecbd /* vldm sp!, <list> */
3263 && (insn2
& 0x0e00) == 0x0a00)
3264 found_stack_adjust
= 1;
3266 return found_stack_adjust
;
3270 arm_stack_frame_destroyed_p_1 (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
3272 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
3275 CORE_ADDR func_start
, func_end
;
3277 if (!find_pc_partial_function (pc
, NULL
, &func_start
, &func_end
))
3280 /* We are in the epilogue if the previous instruction was a stack
3281 adjustment and the next instruction is a possible return (bx, mov
3282 pc, or pop). We could have to scan backwards to find the stack
3283 adjustment, or forwards to find the return, but this is a decent
3284 approximation. First scan forwards. */
3287 insn
= read_memory_unsigned_integer (pc
, 4, byte_order_for_code
);
3288 if (bits (insn
, 28, 31) != INST_NV
)
3290 if ((insn
& 0x0ffffff0) == 0x012fff10)
3293 else if ((insn
& 0x0ffffff0) == 0x01a0f000)
3296 else if ((insn
& 0x0fff0000) == 0x08bd0000
3297 && (insn
& 0x0000c000) != 0)
3298 /* POP (LDMIA), including PC or LR. */
3305 /* Scan backwards. This is just a heuristic, so do not worry about
3306 false positives from mode changes. */
3308 if (pc
< func_start
+ 4)
3311 insn
= read_memory_unsigned_integer (pc
- 4, 4, byte_order_for_code
);
3312 if (arm_instruction_restores_sp (insn
))
3318 /* Implement the stack_frame_destroyed_p gdbarch method. */
3321 arm_stack_frame_destroyed_p (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
3323 if (arm_pc_is_thumb (gdbarch
, pc
))
3324 return thumb_stack_frame_destroyed_p (gdbarch
, pc
);
3326 return arm_stack_frame_destroyed_p_1 (gdbarch
, pc
);
3329 /* When arguments must be pushed onto the stack, they go on in reverse
3330 order. The code below implements a FILO (stack) to do this. */
3335 struct stack_item
*prev
;
3339 static struct stack_item
*
3340 push_stack_item (struct stack_item
*prev
, const gdb_byte
*contents
, int len
)
3342 struct stack_item
*si
;
3343 si
= XNEW (struct stack_item
);
3344 si
->data
= (gdb_byte
*) xmalloc (len
);
3347 memcpy (si
->data
, contents
, len
);
3351 static struct stack_item
*
3352 pop_stack_item (struct stack_item
*si
)
3354 struct stack_item
*dead
= si
;
3362 /* Return the alignment (in bytes) of the given type. */
3365 arm_type_align (struct type
*t
)
3371 t
= check_typedef (t
);
3372 switch (TYPE_CODE (t
))
3375 /* Should never happen. */
3376 internal_error (__FILE__
, __LINE__
, _("unknown type alignment"));
3380 case TYPE_CODE_ENUM
:
3384 case TYPE_CODE_RANGE
:
3386 case TYPE_CODE_CHAR
:
3387 case TYPE_CODE_BOOL
:
3388 return TYPE_LENGTH (t
);
3390 case TYPE_CODE_ARRAY
:
3391 if (TYPE_VECTOR (t
))
3393 /* Use the natural alignment for vector types (the same for
3394 scalar type), but the maximum alignment is 64-bit. */
3395 if (TYPE_LENGTH (t
) > 8)
3398 return TYPE_LENGTH (t
);
3401 return arm_type_align (TYPE_TARGET_TYPE (t
));
3402 case TYPE_CODE_COMPLEX
:
3403 return arm_type_align (TYPE_TARGET_TYPE (t
));
3405 case TYPE_CODE_STRUCT
:
3406 case TYPE_CODE_UNION
:
3408 for (n
= 0; n
< TYPE_NFIELDS (t
); n
++)
3410 falign
= arm_type_align (TYPE_FIELD_TYPE (t
, n
));
3418 /* Possible base types for a candidate for passing and returning in
3421 enum arm_vfp_cprc_base_type
3430 /* The length of one element of base type B. */
3433 arm_vfp_cprc_unit_length (enum arm_vfp_cprc_base_type b
)
3437 case VFP_CPRC_SINGLE
:
3439 case VFP_CPRC_DOUBLE
:
3441 case VFP_CPRC_VEC64
:
3443 case VFP_CPRC_VEC128
:
3446 internal_error (__FILE__
, __LINE__
, _("Invalid VFP CPRC type: %d."),
3451 /* The character ('s', 'd' or 'q') for the type of VFP register used
3452 for passing base type B. */
3455 arm_vfp_cprc_reg_char (enum arm_vfp_cprc_base_type b
)
3459 case VFP_CPRC_SINGLE
:
3461 case VFP_CPRC_DOUBLE
:
3463 case VFP_CPRC_VEC64
:
3465 case VFP_CPRC_VEC128
:
3468 internal_error (__FILE__
, __LINE__
, _("Invalid VFP CPRC type: %d."),
3473 /* Determine whether T may be part of a candidate for passing and
3474 returning in VFP registers, ignoring the limit on the total number
3475 of components. If *BASE_TYPE is VFP_CPRC_UNKNOWN, set it to the
3476 classification of the first valid component found; if it is not
3477 VFP_CPRC_UNKNOWN, all components must have the same classification
3478 as *BASE_TYPE. If it is found that T contains a type not permitted
3479 for passing and returning in VFP registers, a type differently
3480 classified from *BASE_TYPE, or two types differently classified
3481 from each other, return -1, otherwise return the total number of
3482 base-type elements found (possibly 0 in an empty structure or
3483 array). Vector types are not currently supported, matching the
3484 generic AAPCS support. */
3487 arm_vfp_cprc_sub_candidate (struct type
*t
,
3488 enum arm_vfp_cprc_base_type
*base_type
)
3490 t
= check_typedef (t
);
3491 switch (TYPE_CODE (t
))
3494 switch (TYPE_LENGTH (t
))
3497 if (*base_type
== VFP_CPRC_UNKNOWN
)
3498 *base_type
= VFP_CPRC_SINGLE
;
3499 else if (*base_type
!= VFP_CPRC_SINGLE
)
3504 if (*base_type
== VFP_CPRC_UNKNOWN
)
3505 *base_type
= VFP_CPRC_DOUBLE
;
3506 else if (*base_type
!= VFP_CPRC_DOUBLE
)
3515 case TYPE_CODE_COMPLEX
:
3516 /* Arguments of complex T where T is one of the types float or
3517 double get treated as if they are implemented as:
3526 switch (TYPE_LENGTH (t
))
3529 if (*base_type
== VFP_CPRC_UNKNOWN
)
3530 *base_type
= VFP_CPRC_SINGLE
;
3531 else if (*base_type
!= VFP_CPRC_SINGLE
)
3536 if (*base_type
== VFP_CPRC_UNKNOWN
)
3537 *base_type
= VFP_CPRC_DOUBLE
;
3538 else if (*base_type
!= VFP_CPRC_DOUBLE
)
3547 case TYPE_CODE_ARRAY
:
3549 if (TYPE_VECTOR (t
))
3551 /* A 64-bit or 128-bit containerized vector type are VFP
3553 switch (TYPE_LENGTH (t
))
3556 if (*base_type
== VFP_CPRC_UNKNOWN
)
3557 *base_type
= VFP_CPRC_VEC64
;
3560 if (*base_type
== VFP_CPRC_UNKNOWN
)
3561 *base_type
= VFP_CPRC_VEC128
;
3572 count
= arm_vfp_cprc_sub_candidate (TYPE_TARGET_TYPE (t
),
3576 if (TYPE_LENGTH (t
) == 0)
3578 gdb_assert (count
== 0);
3581 else if (count
== 0)
3583 unitlen
= arm_vfp_cprc_unit_length (*base_type
);
3584 gdb_assert ((TYPE_LENGTH (t
) % unitlen
) == 0);
3585 return TYPE_LENGTH (t
) / unitlen
;
3590 case TYPE_CODE_STRUCT
:
3595 for (i
= 0; i
< TYPE_NFIELDS (t
); i
++)
3599 if (!field_is_static (&TYPE_FIELD (t
, i
)))
3600 sub_count
= arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t
, i
),
3602 if (sub_count
== -1)
3606 if (TYPE_LENGTH (t
) == 0)
3608 gdb_assert (count
== 0);
3611 else if (count
== 0)
3613 unitlen
= arm_vfp_cprc_unit_length (*base_type
);
3614 if (TYPE_LENGTH (t
) != unitlen
* count
)
3619 case TYPE_CODE_UNION
:
3624 for (i
= 0; i
< TYPE_NFIELDS (t
); i
++)
3626 int sub_count
= arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t
, i
),
3628 if (sub_count
== -1)
3630 count
= (count
> sub_count
? count
: sub_count
);
3632 if (TYPE_LENGTH (t
) == 0)
3634 gdb_assert (count
== 0);
3637 else if (count
== 0)
3639 unitlen
= arm_vfp_cprc_unit_length (*base_type
);
3640 if (TYPE_LENGTH (t
) != unitlen
* count
)
3652 /* Determine whether T is a VFP co-processor register candidate (CPRC)
3653 if passed to or returned from a non-variadic function with the VFP
3654 ABI in effect. Return 1 if it is, 0 otherwise. If it is, set
3655 *BASE_TYPE to the base type for T and *COUNT to the number of
3656 elements of that base type before returning. */
3659 arm_vfp_call_candidate (struct type
*t
, enum arm_vfp_cprc_base_type
*base_type
,
3662 enum arm_vfp_cprc_base_type b
= VFP_CPRC_UNKNOWN
;
3663 int c
= arm_vfp_cprc_sub_candidate (t
, &b
);
3664 if (c
<= 0 || c
> 4)
3671 /* Return 1 if the VFP ABI should be used for passing arguments to and
3672 returning values from a function of type FUNC_TYPE, 0
3676 arm_vfp_abi_for_function (struct gdbarch
*gdbarch
, struct type
*func_type
)
3678 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
3679 /* Variadic functions always use the base ABI. Assume that functions
3680 without debug info are not variadic. */
3681 if (func_type
&& TYPE_VARARGS (check_typedef (func_type
)))
3683 /* The VFP ABI is only supported as a variant of AAPCS. */
3684 if (tdep
->arm_abi
!= ARM_ABI_AAPCS
)
3686 return gdbarch_tdep (gdbarch
)->fp_model
== ARM_FLOAT_VFP
;
3689 /* We currently only support passing parameters in integer registers, which
3690 conforms with GCC's default model, and VFP argument passing following
3691 the VFP variant of AAPCS. Several other variants exist and
3692 we should probably support some of them based on the selected ABI. */
3695 arm_push_dummy_call (struct gdbarch
*gdbarch
, struct value
*function
,
3696 struct regcache
*regcache
, CORE_ADDR bp_addr
, int nargs
,
3697 struct value
**args
, CORE_ADDR sp
, int struct_return
,
3698 CORE_ADDR struct_addr
)
3700 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
3704 struct stack_item
*si
= NULL
;
3707 unsigned vfp_regs_free
= (1 << 16) - 1;
3709 /* Determine the type of this function and whether the VFP ABI
3711 ftype
= check_typedef (value_type (function
));
3712 if (TYPE_CODE (ftype
) == TYPE_CODE_PTR
)
3713 ftype
= check_typedef (TYPE_TARGET_TYPE (ftype
));
3714 use_vfp_abi
= arm_vfp_abi_for_function (gdbarch
, ftype
);
3716 /* Set the return address. For the ARM, the return breakpoint is
3717 always at BP_ADDR. */
3718 if (arm_pc_is_thumb (gdbarch
, bp_addr
))
3720 regcache_cooked_write_unsigned (regcache
, ARM_LR_REGNUM
, bp_addr
);
3722 /* Walk through the list of args and determine how large a temporary
3723 stack is required. Need to take care here as structs may be
3724 passed on the stack, and we have to push them. */
3727 argreg
= ARM_A1_REGNUM
;
3730 /* The struct_return pointer occupies the first parameter
3731 passing register. */
3735 fprintf_unfiltered (gdb_stdlog
, "struct return in %s = %s\n",
3736 gdbarch_register_name (gdbarch
, argreg
),
3737 paddress (gdbarch
, struct_addr
));
3738 regcache_cooked_write_unsigned (regcache
, argreg
, struct_addr
);
3742 for (argnum
= 0; argnum
< nargs
; argnum
++)
3745 struct type
*arg_type
;
3746 struct type
*target_type
;
3747 enum type_code typecode
;
3748 const bfd_byte
*val
;
3750 enum arm_vfp_cprc_base_type vfp_base_type
;
3752 int may_use_core_reg
= 1;
3754 arg_type
= check_typedef (value_type (args
[argnum
]));
3755 len
= TYPE_LENGTH (arg_type
);
3756 target_type
= TYPE_TARGET_TYPE (arg_type
);
3757 typecode
= TYPE_CODE (arg_type
);
3758 val
= value_contents (args
[argnum
]);
3760 align
= arm_type_align (arg_type
);
3761 /* Round alignment up to a whole number of words. */
3762 align
= (align
+ INT_REGISTER_SIZE
- 1) & ~(INT_REGISTER_SIZE
- 1);
3763 /* Different ABIs have different maximum alignments. */
3764 if (gdbarch_tdep (gdbarch
)->arm_abi
== ARM_ABI_APCS
)
3766 /* The APCS ABI only requires word alignment. */
3767 align
= INT_REGISTER_SIZE
;
3771 /* The AAPCS requires at most doubleword alignment. */
3772 if (align
> INT_REGISTER_SIZE
* 2)
3773 align
= INT_REGISTER_SIZE
* 2;
3777 && arm_vfp_call_candidate (arg_type
, &vfp_base_type
,
3785 /* Because this is a CPRC it cannot go in a core register or
3786 cause a core register to be skipped for alignment.
3787 Either it goes in VFP registers and the rest of this loop
3788 iteration is skipped for this argument, or it goes on the
3789 stack (and the stack alignment code is correct for this
3791 may_use_core_reg
= 0;
3793 unit_length
= arm_vfp_cprc_unit_length (vfp_base_type
);
3794 shift
= unit_length
/ 4;
3795 mask
= (1 << (shift
* vfp_base_count
)) - 1;
3796 for (regno
= 0; regno
< 16; regno
+= shift
)
3797 if (((vfp_regs_free
>> regno
) & mask
) == mask
)
3806 vfp_regs_free
&= ~(mask
<< regno
);
3807 reg_scaled
= regno
/ shift
;
3808 reg_char
= arm_vfp_cprc_reg_char (vfp_base_type
);
3809 for (i
= 0; i
< vfp_base_count
; i
++)
3813 if (reg_char
== 'q')
3814 arm_neon_quad_write (gdbarch
, regcache
, reg_scaled
+ i
,
3815 val
+ i
* unit_length
);
3818 xsnprintf (name_buf
, sizeof (name_buf
), "%c%d",
3819 reg_char
, reg_scaled
+ i
);
3820 regnum
= user_reg_map_name_to_regnum (gdbarch
, name_buf
,
3822 regcache_cooked_write (regcache
, regnum
,
3823 val
+ i
* unit_length
);
3830 /* This CPRC could not go in VFP registers, so all VFP
3831 registers are now marked as used. */
3836 /* Push stack padding for dowubleword alignment. */
3837 if (nstack
& (align
- 1))
3839 si
= push_stack_item (si
, val
, INT_REGISTER_SIZE
);
3840 nstack
+= INT_REGISTER_SIZE
;
3843 /* Doubleword aligned quantities must go in even register pairs. */
3844 if (may_use_core_reg
3845 && argreg
<= ARM_LAST_ARG_REGNUM
3846 && align
> INT_REGISTER_SIZE
3850 /* If the argument is a pointer to a function, and it is a
3851 Thumb function, create a LOCAL copy of the value and set
3852 the THUMB bit in it. */
3853 if (TYPE_CODE_PTR
== typecode
3854 && target_type
!= NULL
3855 && TYPE_CODE_FUNC
== TYPE_CODE (check_typedef (target_type
)))
3857 CORE_ADDR regval
= extract_unsigned_integer (val
, len
, byte_order
);
3858 if (arm_pc_is_thumb (gdbarch
, regval
))
3860 bfd_byte
*copy
= (bfd_byte
*) alloca (len
);
3861 store_unsigned_integer (copy
, len
, byte_order
,
3862 MAKE_THUMB_ADDR (regval
));
3867 /* Copy the argument to general registers or the stack in
3868 register-sized pieces. Large arguments are split between
3869 registers and stack. */
3872 int partial_len
= len
< INT_REGISTER_SIZE
? len
: INT_REGISTER_SIZE
;
3874 = extract_unsigned_integer (val
, partial_len
, byte_order
);
3876 if (may_use_core_reg
&& argreg
<= ARM_LAST_ARG_REGNUM
)
3878 /* The argument is being passed in a general purpose
3880 if (byte_order
== BFD_ENDIAN_BIG
)
3881 regval
<<= (INT_REGISTER_SIZE
- partial_len
) * 8;
3883 fprintf_unfiltered (gdb_stdlog
, "arg %d in %s = 0x%s\n",
3885 gdbarch_register_name
3887 phex (regval
, INT_REGISTER_SIZE
));
3888 regcache_cooked_write_unsigned (regcache
, argreg
, regval
);
3893 gdb_byte buf
[INT_REGISTER_SIZE
];
3895 memset (buf
, 0, sizeof (buf
));
3896 store_unsigned_integer (buf
, partial_len
, byte_order
, regval
);
3898 /* Push the arguments onto the stack. */
3900 fprintf_unfiltered (gdb_stdlog
, "arg %d @ sp + %d\n",
3902 si
= push_stack_item (si
, buf
, INT_REGISTER_SIZE
);
3903 nstack
+= INT_REGISTER_SIZE
;
3910 /* If we have an odd number of words to push, then decrement the stack
3911 by one word now, so first stack argument will be dword aligned. */
3918 write_memory (sp
, si
->data
, si
->len
);
3919 si
= pop_stack_item (si
);
3922 /* Finally, update teh SP register. */
3923 regcache_cooked_write_unsigned (regcache
, ARM_SP_REGNUM
, sp
);
3929 /* Always align the frame to an 8-byte boundary. This is required on
3930 some platforms and harmless on the rest. */
3933 arm_frame_align (struct gdbarch
*gdbarch
, CORE_ADDR sp
)
3935 /* Align the stack to eight bytes. */
3936 return sp
& ~ (CORE_ADDR
) 7;
3940 print_fpu_flags (struct ui_file
*file
, int flags
)
3942 if (flags
& (1 << 0))
3943 fputs_filtered ("IVO ", file
);
3944 if (flags
& (1 << 1))
3945 fputs_filtered ("DVZ ", file
);
3946 if (flags
& (1 << 2))
3947 fputs_filtered ("OFL ", file
);
3948 if (flags
& (1 << 3))
3949 fputs_filtered ("UFL ", file
);
3950 if (flags
& (1 << 4))
3951 fputs_filtered ("INX ", file
);
3952 fputc_filtered ('\n', file
);
3955 /* Print interesting information about the floating point processor
3956 (if present) or emulator. */
3958 arm_print_float_info (struct gdbarch
*gdbarch
, struct ui_file
*file
,
3959 struct frame_info
*frame
, const char *args
)
3961 unsigned long status
= get_frame_register_unsigned (frame
, ARM_FPS_REGNUM
);
3964 type
= (status
>> 24) & 127;
3965 if (status
& (1 << 31))
3966 fprintf_filtered (file
, _("Hardware FPU type %d\n"), type
);
3968 fprintf_filtered (file
, _("Software FPU type %d\n"), type
);
3969 /* i18n: [floating point unit] mask */
3970 fputs_filtered (_("mask: "), file
);
3971 print_fpu_flags (file
, status
>> 16);
3972 /* i18n: [floating point unit] flags */
3973 fputs_filtered (_("flags: "), file
);
3974 print_fpu_flags (file
, status
);
3977 /* Construct the ARM extended floating point type. */
3978 static struct type
*
3979 arm_ext_type (struct gdbarch
*gdbarch
)
3981 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
3983 if (!tdep
->arm_ext_type
)
3985 = arch_float_type (gdbarch
, -1, "builtin_type_arm_ext",
3986 floatformats_arm_ext
);
3988 return tdep
->arm_ext_type
;
3991 static struct type
*
3992 arm_neon_double_type (struct gdbarch
*gdbarch
)
3994 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
3996 if (tdep
->neon_double_type
== NULL
)
3998 struct type
*t
, *elem
;
4000 t
= arch_composite_type (gdbarch
, "__gdb_builtin_type_neon_d",
4002 elem
= builtin_type (gdbarch
)->builtin_uint8
;
4003 append_composite_type_field (t
, "u8", init_vector_type (elem
, 8));
4004 elem
= builtin_type (gdbarch
)->builtin_uint16
;
4005 append_composite_type_field (t
, "u16", init_vector_type (elem
, 4));
4006 elem
= builtin_type (gdbarch
)->builtin_uint32
;
4007 append_composite_type_field (t
, "u32", init_vector_type (elem
, 2));
4008 elem
= builtin_type (gdbarch
)->builtin_uint64
;
4009 append_composite_type_field (t
, "u64", elem
);
4010 elem
= builtin_type (gdbarch
)->builtin_float
;
4011 append_composite_type_field (t
, "f32", init_vector_type (elem
, 2));
4012 elem
= builtin_type (gdbarch
)->builtin_double
;
4013 append_composite_type_field (t
, "f64", elem
);
4015 TYPE_VECTOR (t
) = 1;
4016 TYPE_NAME (t
) = "neon_d";
4017 tdep
->neon_double_type
= t
;
4020 return tdep
->neon_double_type
;
4023 /* FIXME: The vector types are not correctly ordered on big-endian
4024 targets. Just as s0 is the low bits of d0, d0[0] is also the low
4025 bits of d0 - regardless of what unit size is being held in d0. So
4026 the offset of the first uint8 in d0 is 7, but the offset of the
4027 first float is 4. This code works as-is for little-endian
4030 static struct type
*
4031 arm_neon_quad_type (struct gdbarch
*gdbarch
)
4033 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
4035 if (tdep
->neon_quad_type
== NULL
)
4037 struct type
*t
, *elem
;
4039 t
= arch_composite_type (gdbarch
, "__gdb_builtin_type_neon_q",
4041 elem
= builtin_type (gdbarch
)->builtin_uint8
;
4042 append_composite_type_field (t
, "u8", init_vector_type (elem
, 16));
4043 elem
= builtin_type (gdbarch
)->builtin_uint16
;
4044 append_composite_type_field (t
, "u16", init_vector_type (elem
, 8));
4045 elem
= builtin_type (gdbarch
)->builtin_uint32
;
4046 append_composite_type_field (t
, "u32", init_vector_type (elem
, 4));
4047 elem
= builtin_type (gdbarch
)->builtin_uint64
;
4048 append_composite_type_field (t
, "u64", init_vector_type (elem
, 2));
4049 elem
= builtin_type (gdbarch
)->builtin_float
;
4050 append_composite_type_field (t
, "f32", init_vector_type (elem
, 4));
4051 elem
= builtin_type (gdbarch
)->builtin_double
;
4052 append_composite_type_field (t
, "f64", init_vector_type (elem
, 2));
4054 TYPE_VECTOR (t
) = 1;
4055 TYPE_NAME (t
) = "neon_q";
4056 tdep
->neon_quad_type
= t
;
4059 return tdep
->neon_quad_type
;
4062 /* Return the GDB type object for the "standard" data type of data in
4065 static struct type
*
4066 arm_register_type (struct gdbarch
*gdbarch
, int regnum
)
4068 int num_regs
= gdbarch_num_regs (gdbarch
);
4070 if (gdbarch_tdep (gdbarch
)->have_vfp_pseudos
4071 && regnum
>= num_regs
&& regnum
< num_regs
+ 32)
4072 return builtin_type (gdbarch
)->builtin_float
;
4074 if (gdbarch_tdep (gdbarch
)->have_neon_pseudos
4075 && regnum
>= num_regs
+ 32 && regnum
< num_regs
+ 32 + 16)
4076 return arm_neon_quad_type (gdbarch
);
4078 /* If the target description has register information, we are only
4079 in this function so that we can override the types of
4080 double-precision registers for NEON. */
4081 if (tdesc_has_registers (gdbarch_target_desc (gdbarch
)))
4083 struct type
*t
= tdesc_register_type (gdbarch
, regnum
);
4085 if (regnum
>= ARM_D0_REGNUM
&& regnum
< ARM_D0_REGNUM
+ 32
4086 && TYPE_CODE (t
) == TYPE_CODE_FLT
4087 && gdbarch_tdep (gdbarch
)->have_neon
)
4088 return arm_neon_double_type (gdbarch
);
4093 if (regnum
>= ARM_F0_REGNUM
&& regnum
< ARM_F0_REGNUM
+ NUM_FREGS
)
4095 if (!gdbarch_tdep (gdbarch
)->have_fpa_registers
)
4096 return builtin_type (gdbarch
)->builtin_void
;
4098 return arm_ext_type (gdbarch
);
4100 else if (regnum
== ARM_SP_REGNUM
)
4101 return builtin_type (gdbarch
)->builtin_data_ptr
;
4102 else if (regnum
== ARM_PC_REGNUM
)
4103 return builtin_type (gdbarch
)->builtin_func_ptr
;
4104 else if (regnum
>= ARRAY_SIZE (arm_register_names
))
4105 /* These registers are only supported on targets which supply
4106 an XML description. */
4107 return builtin_type (gdbarch
)->builtin_int0
;
4109 return builtin_type (gdbarch
)->builtin_uint32
;
4112 /* Map a DWARF register REGNUM onto the appropriate GDB register
4116 arm_dwarf_reg_to_regnum (struct gdbarch
*gdbarch
, int reg
)
4118 /* Core integer regs. */
4119 if (reg
>= 0 && reg
<= 15)
4122 /* Legacy FPA encoding. These were once used in a way which
4123 overlapped with VFP register numbering, so their use is
4124 discouraged, but GDB doesn't support the ARM toolchain
4125 which used them for VFP. */
4126 if (reg
>= 16 && reg
<= 23)
4127 return ARM_F0_REGNUM
+ reg
- 16;
4129 /* New assignments for the FPA registers. */
4130 if (reg
>= 96 && reg
<= 103)
4131 return ARM_F0_REGNUM
+ reg
- 96;
4133 /* WMMX register assignments. */
4134 if (reg
>= 104 && reg
<= 111)
4135 return ARM_WCGR0_REGNUM
+ reg
- 104;
4137 if (reg
>= 112 && reg
<= 127)
4138 return ARM_WR0_REGNUM
+ reg
- 112;
4140 if (reg
>= 192 && reg
<= 199)
4141 return ARM_WC0_REGNUM
+ reg
- 192;
4143 /* VFP v2 registers. A double precision value is actually
4144 in d1 rather than s2, but the ABI only defines numbering
4145 for the single precision registers. This will "just work"
4146 in GDB for little endian targets (we'll read eight bytes,
4147 starting in s0 and then progressing to s1), but will be
4148 reversed on big endian targets with VFP. This won't
4149 be a problem for the new Neon quad registers; you're supposed
4150 to use DW_OP_piece for those. */
4151 if (reg
>= 64 && reg
<= 95)
4155 xsnprintf (name_buf
, sizeof (name_buf
), "s%d", reg
- 64);
4156 return user_reg_map_name_to_regnum (gdbarch
, name_buf
,
4160 /* VFP v3 / Neon registers. This range is also used for VFP v2
4161 registers, except that it now describes d0 instead of s0. */
4162 if (reg
>= 256 && reg
<= 287)
4166 xsnprintf (name_buf
, sizeof (name_buf
), "d%d", reg
- 256);
4167 return user_reg_map_name_to_regnum (gdbarch
, name_buf
,
4174 /* Map GDB internal REGNUM onto the Arm simulator register numbers. */
4176 arm_register_sim_regno (struct gdbarch
*gdbarch
, int regnum
)
4179 gdb_assert (reg
>= 0 && reg
< gdbarch_num_regs (gdbarch
));
4181 if (regnum
>= ARM_WR0_REGNUM
&& regnum
<= ARM_WR15_REGNUM
)
4182 return regnum
- ARM_WR0_REGNUM
+ SIM_ARM_IWMMXT_COP0R0_REGNUM
;
4184 if (regnum
>= ARM_WC0_REGNUM
&& regnum
<= ARM_WC7_REGNUM
)
4185 return regnum
- ARM_WC0_REGNUM
+ SIM_ARM_IWMMXT_COP1R0_REGNUM
;
4187 if (regnum
>= ARM_WCGR0_REGNUM
&& regnum
<= ARM_WCGR7_REGNUM
)
4188 return regnum
- ARM_WCGR0_REGNUM
+ SIM_ARM_IWMMXT_COP1R8_REGNUM
;
4190 if (reg
< NUM_GREGS
)
4191 return SIM_ARM_R0_REGNUM
+ reg
;
4194 if (reg
< NUM_FREGS
)
4195 return SIM_ARM_FP0_REGNUM
+ reg
;
4198 if (reg
< NUM_SREGS
)
4199 return SIM_ARM_FPS_REGNUM
+ reg
;
4202 internal_error (__FILE__
, __LINE__
, _("Bad REGNUM %d"), regnum
);
4205 /* NOTE: cagney/2001-08-20: Both convert_from_extended() and
4206 convert_to_extended() use floatformat_arm_ext_littlebyte_bigword.
4207 It is thought that this is is the floating-point register format on
4208 little-endian systems. */
4211 convert_from_extended (const struct floatformat
*fmt
, const void *ptr
,
4212 void *dbl
, int endianess
)
4216 if (endianess
== BFD_ENDIAN_BIG
)
4217 floatformat_to_doublest (&floatformat_arm_ext_big
, ptr
, &d
);
4219 floatformat_to_doublest (&floatformat_arm_ext_littlebyte_bigword
,
4221 floatformat_from_doublest (fmt
, &d
, dbl
);
4225 convert_to_extended (const struct floatformat
*fmt
, void *dbl
, const void *ptr
,
4230 floatformat_to_doublest (fmt
, ptr
, &d
);
4231 if (endianess
== BFD_ENDIAN_BIG
)
4232 floatformat_from_doublest (&floatformat_arm_ext_big
, &d
, dbl
);
4234 floatformat_from_doublest (&floatformat_arm_ext_littlebyte_bigword
,
4238 /* Given BUF, which is OLD_LEN bytes ending at ENDADDR, expand
4239 the buffer to be NEW_LEN bytes ending at ENDADDR. Return
4240 NULL if an error occurs. BUF is freed. */
4243 extend_buffer_earlier (gdb_byte
*buf
, CORE_ADDR endaddr
,
4244 int old_len
, int new_len
)
4247 int bytes_to_read
= new_len
- old_len
;
4249 new_buf
= (gdb_byte
*) xmalloc (new_len
);
4250 memcpy (new_buf
+ bytes_to_read
, buf
, old_len
);
4252 if (target_read_memory (endaddr
- new_len
, new_buf
, bytes_to_read
) != 0)
4260 /* An IT block is at most the 2-byte IT instruction followed by
4261 four 4-byte instructions. The furthest back we must search to
4262 find an IT block that affects the current instruction is thus
4263 2 + 3 * 4 == 14 bytes. */
4264 #define MAX_IT_BLOCK_PREFIX 14
4266 /* Use a quick scan if there are more than this many bytes of
4268 #define IT_SCAN_THRESHOLD 32
4270 /* Adjust a breakpoint's address to move breakpoints out of IT blocks.
4271 A breakpoint in an IT block may not be hit, depending on the
4274 arm_adjust_breakpoint_address (struct gdbarch
*gdbarch
, CORE_ADDR bpaddr
)
4278 CORE_ADDR boundary
, func_start
;
4280 enum bfd_endian order
= gdbarch_byte_order_for_code (gdbarch
);
4281 int i
, any
, last_it
, last_it_count
;
4283 /* If we are using BKPT breakpoints, none of this is necessary. */
4284 if (gdbarch_tdep (gdbarch
)->thumb2_breakpoint
== NULL
)
4287 /* ARM mode does not have this problem. */
4288 if (!arm_pc_is_thumb (gdbarch
, bpaddr
))
4291 /* We are setting a breakpoint in Thumb code that could potentially
4292 contain an IT block. The first step is to find how much Thumb
4293 code there is; we do not need to read outside of known Thumb
4295 map_type
= arm_find_mapping_symbol (bpaddr
, &boundary
);
4297 /* Thumb-2 code must have mapping symbols to have a chance. */
4300 bpaddr
= gdbarch_addr_bits_remove (gdbarch
, bpaddr
);
4302 if (find_pc_partial_function (bpaddr
, NULL
, &func_start
, NULL
)
4303 && func_start
> boundary
)
4304 boundary
= func_start
;
4306 /* Search for a candidate IT instruction. We have to do some fancy
4307 footwork to distinguish a real IT instruction from the second
4308 half of a 32-bit instruction, but there is no need for that if
4309 there's no candidate. */
4310 buf_len
= std::min (bpaddr
- boundary
, (CORE_ADDR
) MAX_IT_BLOCK_PREFIX
);
4312 /* No room for an IT instruction. */
4315 buf
= (gdb_byte
*) xmalloc (buf_len
);
4316 if (target_read_memory (bpaddr
- buf_len
, buf
, buf_len
) != 0)
4319 for (i
= 0; i
< buf_len
; i
+= 2)
4321 unsigned short inst1
= extract_unsigned_integer (&buf
[i
], 2, order
);
4322 if ((inst1
& 0xff00) == 0xbf00 && (inst1
& 0x000f) != 0)
4335 /* OK, the code bytes before this instruction contain at least one
4336 halfword which resembles an IT instruction. We know that it's
4337 Thumb code, but there are still two possibilities. Either the
4338 halfword really is an IT instruction, or it is the second half of
4339 a 32-bit Thumb instruction. The only way we can tell is to
4340 scan forwards from a known instruction boundary. */
4341 if (bpaddr
- boundary
> IT_SCAN_THRESHOLD
)
4345 /* There's a lot of code before this instruction. Start with an
4346 optimistic search; it's easy to recognize halfwords that can
4347 not be the start of a 32-bit instruction, and use that to
4348 lock on to the instruction boundaries. */
4349 buf
= extend_buffer_earlier (buf
, bpaddr
, buf_len
, IT_SCAN_THRESHOLD
);
4352 buf_len
= IT_SCAN_THRESHOLD
;
4355 for (i
= 0; i
< buf_len
- sizeof (buf
) && ! definite
; i
+= 2)
4357 unsigned short inst1
= extract_unsigned_integer (&buf
[i
], 2, order
);
4358 if (thumb_insn_size (inst1
) == 2)
4365 /* At this point, if DEFINITE, BUF[I] is the first place we
4366 are sure that we know the instruction boundaries, and it is far
4367 enough from BPADDR that we could not miss an IT instruction
4368 affecting BPADDR. If ! DEFINITE, give up - start from a
4372 buf
= extend_buffer_earlier (buf
, bpaddr
, buf_len
,
4376 buf_len
= bpaddr
- boundary
;
4382 buf
= extend_buffer_earlier (buf
, bpaddr
, buf_len
, bpaddr
- boundary
);
4385 buf_len
= bpaddr
- boundary
;
4389 /* Scan forwards. Find the last IT instruction before BPADDR. */
4394 unsigned short inst1
= extract_unsigned_integer (&buf
[i
], 2, order
);
4396 if ((inst1
& 0xff00) == 0xbf00 && (inst1
& 0x000f) != 0)
4401 else if (inst1
& 0x0002)
4403 else if (inst1
& 0x0004)
4408 i
+= thumb_insn_size (inst1
);
4414 /* There wasn't really an IT instruction after all. */
4417 if (last_it_count
< 1)
4418 /* It was too far away. */
4421 /* This really is a trouble spot. Move the breakpoint to the IT
4423 return bpaddr
- buf_len
+ last_it
;
4426 /* ARM displaced stepping support.
4428 Generally ARM displaced stepping works as follows:
4430 1. When an instruction is to be single-stepped, it is first decoded by
4431 arm_process_displaced_insn. Depending on the type of instruction, it is
4432 then copied to a scratch location, possibly in a modified form. The
4433 copy_* set of functions performs such modification, as necessary. A
4434 breakpoint is placed after the modified instruction in the scratch space
4435 to return control to GDB. Note in particular that instructions which
4436 modify the PC will no longer do so after modification.
4438 2. The instruction is single-stepped, by setting the PC to the scratch
4439 location address, and resuming. Control returns to GDB when the
4442 3. A cleanup function (cleanup_*) is called corresponding to the copy_*
4443 function used for the current instruction. This function's job is to
4444 put the CPU/memory state back to what it would have been if the
4445 instruction had been executed unmodified in its original location. */
4447 /* NOP instruction (mov r0, r0). */
4448 #define ARM_NOP 0xe1a00000
4449 #define THUMB_NOP 0x4600
4451 /* Helper for register reads for displaced stepping. In particular, this
4452 returns the PC as it would be seen by the instruction at its original
4456 displaced_read_reg (struct regcache
*regs
, struct displaced_step_closure
*dsc
,
4460 CORE_ADDR from
= dsc
->insn_addr
;
4462 if (regno
== ARM_PC_REGNUM
)
4464 /* Compute pipeline offset:
4465 - When executing an ARM instruction, PC reads as the address of the
4466 current instruction plus 8.
4467 - When executing a Thumb instruction, PC reads as the address of the
4468 current instruction plus 4. */
4475 if (debug_displaced
)
4476 fprintf_unfiltered (gdb_stdlog
, "displaced: read pc value %.8lx\n",
4477 (unsigned long) from
);
4478 return (ULONGEST
) from
;
4482 regcache_cooked_read_unsigned (regs
, regno
, &ret
);
4483 if (debug_displaced
)
4484 fprintf_unfiltered (gdb_stdlog
, "displaced: read r%d value %.8lx\n",
4485 regno
, (unsigned long) ret
);
4491 displaced_in_arm_mode (struct regcache
*regs
)
4494 ULONGEST t_bit
= arm_psr_thumb_bit (get_regcache_arch (regs
));
4496 regcache_cooked_read_unsigned (regs
, ARM_PS_REGNUM
, &ps
);
4498 return (ps
& t_bit
) == 0;
4501 /* Write to the PC as from a branch instruction. */
4504 branch_write_pc (struct regcache
*regs
, struct displaced_step_closure
*dsc
,
4508 /* Note: If bits 0/1 are set, this branch would be unpredictable for
4509 architecture versions < 6. */
4510 regcache_cooked_write_unsigned (regs
, ARM_PC_REGNUM
,
4511 val
& ~(ULONGEST
) 0x3);
4513 regcache_cooked_write_unsigned (regs
, ARM_PC_REGNUM
,
4514 val
& ~(ULONGEST
) 0x1);
4517 /* Write to the PC as from a branch-exchange instruction. */
4520 bx_write_pc (struct regcache
*regs
, ULONGEST val
)
4523 ULONGEST t_bit
= arm_psr_thumb_bit (get_regcache_arch (regs
));
4525 regcache_cooked_read_unsigned (regs
, ARM_PS_REGNUM
, &ps
);
4529 regcache_cooked_write_unsigned (regs
, ARM_PS_REGNUM
, ps
| t_bit
);
4530 regcache_cooked_write_unsigned (regs
, ARM_PC_REGNUM
, val
& 0xfffffffe);
4532 else if ((val
& 2) == 0)
4534 regcache_cooked_write_unsigned (regs
, ARM_PS_REGNUM
, ps
& ~t_bit
);
4535 regcache_cooked_write_unsigned (regs
, ARM_PC_REGNUM
, val
);
4539 /* Unpredictable behaviour. Try to do something sensible (switch to ARM
4540 mode, align dest to 4 bytes). */
4541 warning (_("Single-stepping BX to non-word-aligned ARM instruction."));
4542 regcache_cooked_write_unsigned (regs
, ARM_PS_REGNUM
, ps
& ~t_bit
);
4543 regcache_cooked_write_unsigned (regs
, ARM_PC_REGNUM
, val
& 0xfffffffc);
4547 /* Write to the PC as if from a load instruction. */
4550 load_write_pc (struct regcache
*regs
, struct displaced_step_closure
*dsc
,
4553 if (DISPLACED_STEPPING_ARCH_VERSION
>= 5)
4554 bx_write_pc (regs
, val
);
4556 branch_write_pc (regs
, dsc
, val
);
4559 /* Write to the PC as if from an ALU instruction. */
4562 alu_write_pc (struct regcache
*regs
, struct displaced_step_closure
*dsc
,
4565 if (DISPLACED_STEPPING_ARCH_VERSION
>= 7 && !dsc
->is_thumb
)
4566 bx_write_pc (regs
, val
);
4568 branch_write_pc (regs
, dsc
, val
);
4571 /* Helper for writing to registers for displaced stepping. Writing to the PC
4572 has a varying effects depending on the instruction which does the write:
4573 this is controlled by the WRITE_PC argument. */
4576 displaced_write_reg (struct regcache
*regs
, struct displaced_step_closure
*dsc
,
4577 int regno
, ULONGEST val
, enum pc_write_style write_pc
)
4579 if (regno
== ARM_PC_REGNUM
)
4581 if (debug_displaced
)
4582 fprintf_unfiltered (gdb_stdlog
, "displaced: writing pc %.8lx\n",
4583 (unsigned long) val
);
4586 case BRANCH_WRITE_PC
:
4587 branch_write_pc (regs
, dsc
, val
);
4591 bx_write_pc (regs
, val
);
4595 load_write_pc (regs
, dsc
, val
);
4599 alu_write_pc (regs
, dsc
, val
);
4602 case CANNOT_WRITE_PC
:
4603 warning (_("Instruction wrote to PC in an unexpected way when "
4604 "single-stepping"));
4608 internal_error (__FILE__
, __LINE__
,
4609 _("Invalid argument to displaced_write_reg"));
4612 dsc
->wrote_to_pc
= 1;
4616 if (debug_displaced
)
4617 fprintf_unfiltered (gdb_stdlog
, "displaced: writing r%d value %.8lx\n",
4618 regno
, (unsigned long) val
);
4619 regcache_cooked_write_unsigned (regs
, regno
, val
);
4623 /* This function is used to concisely determine if an instruction INSN
4624 references PC. Register fields of interest in INSN should have the
4625 corresponding fields of BITMASK set to 0b1111. The function
4626 returns return 1 if any of these fields in INSN reference the PC
4627 (also 0b1111, r15), else it returns 0. */
4630 insn_references_pc (uint32_t insn
, uint32_t bitmask
)
4632 uint32_t lowbit
= 1;
4634 while (bitmask
!= 0)
4638 for (; lowbit
&& (bitmask
& lowbit
) == 0; lowbit
<<= 1)
4644 mask
= lowbit
* 0xf;
4646 if ((insn
& mask
) == mask
)
4655 /* The simplest copy function. Many instructions have the same effect no
4656 matter what address they are executed at: in those cases, use this. */
4659 arm_copy_unmodified (struct gdbarch
*gdbarch
, uint32_t insn
,
4660 const char *iname
, struct displaced_step_closure
*dsc
)
4662 if (debug_displaced
)
4663 fprintf_unfiltered (gdb_stdlog
, "displaced: copying insn %.8lx, "
4664 "opcode/class '%s' unmodified\n", (unsigned long) insn
,
4667 dsc
->modinsn
[0] = insn
;
4673 thumb_copy_unmodified_32bit (struct gdbarch
*gdbarch
, uint16_t insn1
,
4674 uint16_t insn2
, const char *iname
,
4675 struct displaced_step_closure
*dsc
)
4677 if (debug_displaced
)
4678 fprintf_unfiltered (gdb_stdlog
, "displaced: copying insn %.4x %.4x, "
4679 "opcode/class '%s' unmodified\n", insn1
, insn2
,
4682 dsc
->modinsn
[0] = insn1
;
4683 dsc
->modinsn
[1] = insn2
;
4689 /* Copy 16-bit Thumb(Thumb and 16-bit Thumb-2) instruction without any
4692 thumb_copy_unmodified_16bit (struct gdbarch
*gdbarch
, uint16_t insn
,
4694 struct displaced_step_closure
*dsc
)
4696 if (debug_displaced
)
4697 fprintf_unfiltered (gdb_stdlog
, "displaced: copying insn %.4x, "
4698 "opcode/class '%s' unmodified\n", insn
,
4701 dsc
->modinsn
[0] = insn
;
4706 /* Preload instructions with immediate offset. */
4709 cleanup_preload (struct gdbarch
*gdbarch
,
4710 struct regcache
*regs
, struct displaced_step_closure
*dsc
)
4712 displaced_write_reg (regs
, dsc
, 0, dsc
->tmp
[0], CANNOT_WRITE_PC
);
4713 if (!dsc
->u
.preload
.immed
)
4714 displaced_write_reg (regs
, dsc
, 1, dsc
->tmp
[1], CANNOT_WRITE_PC
);
4718 install_preload (struct gdbarch
*gdbarch
, struct regcache
*regs
,
4719 struct displaced_step_closure
*dsc
, unsigned int rn
)
4722 /* Preload instructions:
4724 {pli/pld} [rn, #+/-imm]
4726 {pli/pld} [r0, #+/-imm]. */
4728 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
4729 rn_val
= displaced_read_reg (regs
, dsc
, rn
);
4730 displaced_write_reg (regs
, dsc
, 0, rn_val
, CANNOT_WRITE_PC
);
4731 dsc
->u
.preload
.immed
= 1;
4733 dsc
->cleanup
= &cleanup_preload
;
4737 arm_copy_preload (struct gdbarch
*gdbarch
, uint32_t insn
, struct regcache
*regs
,
4738 struct displaced_step_closure
*dsc
)
4740 unsigned int rn
= bits (insn
, 16, 19);
4742 if (!insn_references_pc (insn
, 0x000f0000ul
))
4743 return arm_copy_unmodified (gdbarch
, insn
, "preload", dsc
);
4745 if (debug_displaced
)
4746 fprintf_unfiltered (gdb_stdlog
, "displaced: copying preload insn %.8lx\n",
4747 (unsigned long) insn
);
4749 dsc
->modinsn
[0] = insn
& 0xfff0ffff;
4751 install_preload (gdbarch
, regs
, dsc
, rn
);
4757 thumb2_copy_preload (struct gdbarch
*gdbarch
, uint16_t insn1
, uint16_t insn2
,
4758 struct regcache
*regs
, struct displaced_step_closure
*dsc
)
4760 unsigned int rn
= bits (insn1
, 0, 3);
4761 unsigned int u_bit
= bit (insn1
, 7);
4762 int imm12
= bits (insn2
, 0, 11);
4765 if (rn
!= ARM_PC_REGNUM
)
4766 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
, "preload", dsc
);
4768 /* PC is only allowed to use in PLI (immediate,literal) Encoding T3, and
4769 PLD (literal) Encoding T1. */
4770 if (debug_displaced
)
4771 fprintf_unfiltered (gdb_stdlog
,
4772 "displaced: copying pld/pli pc (0x%x) %c imm12 %.4x\n",
4773 (unsigned int) dsc
->insn_addr
, u_bit
? '+' : '-',
4779 /* Rewrite instruction {pli/pld} PC imm12 into:
4780 Prepare: tmp[0] <- r0, tmp[1] <- r1, r0 <- pc, r1 <- imm12
4784 Cleanup: r0 <- tmp[0], r1 <- tmp[1]. */
4786 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
4787 dsc
->tmp
[1] = displaced_read_reg (regs
, dsc
, 1);
4789 pc_val
= displaced_read_reg (regs
, dsc
, ARM_PC_REGNUM
);
4791 displaced_write_reg (regs
, dsc
, 0, pc_val
, CANNOT_WRITE_PC
);
4792 displaced_write_reg (regs
, dsc
, 1, imm12
, CANNOT_WRITE_PC
);
4793 dsc
->u
.preload
.immed
= 0;
4795 /* {pli/pld} [r0, r1] */
4796 dsc
->modinsn
[0] = insn1
& 0xfff0;
4797 dsc
->modinsn
[1] = 0xf001;
4800 dsc
->cleanup
= &cleanup_preload
;
4804 /* Preload instructions with register offset. */
4807 install_preload_reg(struct gdbarch
*gdbarch
, struct regcache
*regs
,
4808 struct displaced_step_closure
*dsc
, unsigned int rn
,
4811 ULONGEST rn_val
, rm_val
;
4813 /* Preload register-offset instructions:
4815 {pli/pld} [rn, rm {, shift}]
4817 {pli/pld} [r0, r1 {, shift}]. */
4819 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
4820 dsc
->tmp
[1] = displaced_read_reg (regs
, dsc
, 1);
4821 rn_val
= displaced_read_reg (regs
, dsc
, rn
);
4822 rm_val
= displaced_read_reg (regs
, dsc
, rm
);
4823 displaced_write_reg (regs
, dsc
, 0, rn_val
, CANNOT_WRITE_PC
);
4824 displaced_write_reg (regs
, dsc
, 1, rm_val
, CANNOT_WRITE_PC
);
4825 dsc
->u
.preload
.immed
= 0;
4827 dsc
->cleanup
= &cleanup_preload
;
4831 arm_copy_preload_reg (struct gdbarch
*gdbarch
, uint32_t insn
,
4832 struct regcache
*regs
,
4833 struct displaced_step_closure
*dsc
)
4835 unsigned int rn
= bits (insn
, 16, 19);
4836 unsigned int rm
= bits (insn
, 0, 3);
4839 if (!insn_references_pc (insn
, 0x000f000ful
))
4840 return arm_copy_unmodified (gdbarch
, insn
, "preload reg", dsc
);
4842 if (debug_displaced
)
4843 fprintf_unfiltered (gdb_stdlog
, "displaced: copying preload insn %.8lx\n",
4844 (unsigned long) insn
);
4846 dsc
->modinsn
[0] = (insn
& 0xfff0fff0) | 0x1;
4848 install_preload_reg (gdbarch
, regs
, dsc
, rn
, rm
);
4852 /* Copy/cleanup coprocessor load and store instructions. */
4855 cleanup_copro_load_store (struct gdbarch
*gdbarch
,
4856 struct regcache
*regs
,
4857 struct displaced_step_closure
*dsc
)
4859 ULONGEST rn_val
= displaced_read_reg (regs
, dsc
, 0);
4861 displaced_write_reg (regs
, dsc
, 0, dsc
->tmp
[0], CANNOT_WRITE_PC
);
4863 if (dsc
->u
.ldst
.writeback
)
4864 displaced_write_reg (regs
, dsc
, dsc
->u
.ldst
.rn
, rn_val
, LOAD_WRITE_PC
);
4868 install_copro_load_store (struct gdbarch
*gdbarch
, struct regcache
*regs
,
4869 struct displaced_step_closure
*dsc
,
4870 int writeback
, unsigned int rn
)
4874 /* Coprocessor load/store instructions:
4876 {stc/stc2} [<Rn>, #+/-imm] (and other immediate addressing modes)
4878 {stc/stc2} [r0, #+/-imm].
4880 ldc/ldc2 are handled identically. */
4882 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
4883 rn_val
= displaced_read_reg (regs
, dsc
, rn
);
4884 /* PC should be 4-byte aligned. */
4885 rn_val
= rn_val
& 0xfffffffc;
4886 displaced_write_reg (regs
, dsc
, 0, rn_val
, CANNOT_WRITE_PC
);
4888 dsc
->u
.ldst
.writeback
= writeback
;
4889 dsc
->u
.ldst
.rn
= rn
;
4891 dsc
->cleanup
= &cleanup_copro_load_store
;
4895 arm_copy_copro_load_store (struct gdbarch
*gdbarch
, uint32_t insn
,
4896 struct regcache
*regs
,
4897 struct displaced_step_closure
*dsc
)
4899 unsigned int rn
= bits (insn
, 16, 19);
4901 if (!insn_references_pc (insn
, 0x000f0000ul
))
4902 return arm_copy_unmodified (gdbarch
, insn
, "copro load/store", dsc
);
4904 if (debug_displaced
)
4905 fprintf_unfiltered (gdb_stdlog
, "displaced: copying coprocessor "
4906 "load/store insn %.8lx\n", (unsigned long) insn
);
4908 dsc
->modinsn
[0] = insn
& 0xfff0ffff;
4910 install_copro_load_store (gdbarch
, regs
, dsc
, bit (insn
, 25), rn
);
4916 thumb2_copy_copro_load_store (struct gdbarch
*gdbarch
, uint16_t insn1
,
4917 uint16_t insn2
, struct regcache
*regs
,
4918 struct displaced_step_closure
*dsc
)
4920 unsigned int rn
= bits (insn1
, 0, 3);
4922 if (rn
!= ARM_PC_REGNUM
)
4923 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
4924 "copro load/store", dsc
);
4926 if (debug_displaced
)
4927 fprintf_unfiltered (gdb_stdlog
, "displaced: copying coprocessor "
4928 "load/store insn %.4x%.4x\n", insn1
, insn2
);
4930 dsc
->modinsn
[0] = insn1
& 0xfff0;
4931 dsc
->modinsn
[1] = insn2
;
4934 /* This function is called for copying instruction LDC/LDC2/VLDR, which
4935 doesn't support writeback, so pass 0. */
4936 install_copro_load_store (gdbarch
, regs
, dsc
, 0, rn
);
4941 /* Clean up branch instructions (actually perform the branch, by setting
4945 cleanup_branch (struct gdbarch
*gdbarch
, struct regcache
*regs
,
4946 struct displaced_step_closure
*dsc
)
4948 uint32_t status
= displaced_read_reg (regs
, dsc
, ARM_PS_REGNUM
);
4949 int branch_taken
= condition_true (dsc
->u
.branch
.cond
, status
);
4950 enum pc_write_style write_pc
= dsc
->u
.branch
.exchange
4951 ? BX_WRITE_PC
: BRANCH_WRITE_PC
;
4956 if (dsc
->u
.branch
.link
)
4958 /* The value of LR should be the next insn of current one. In order
4959 not to confuse logic hanlding later insn `bx lr', if current insn mode
4960 is Thumb, the bit 0 of LR value should be set to 1. */
4961 ULONGEST next_insn_addr
= dsc
->insn_addr
+ dsc
->insn_size
;
4964 next_insn_addr
|= 0x1;
4966 displaced_write_reg (regs
, dsc
, ARM_LR_REGNUM
, next_insn_addr
,
4970 displaced_write_reg (regs
, dsc
, ARM_PC_REGNUM
, dsc
->u
.branch
.dest
, write_pc
);
4973 /* Copy B/BL/BLX instructions with immediate destinations. */
4976 install_b_bl_blx (struct gdbarch
*gdbarch
, struct regcache
*regs
,
4977 struct displaced_step_closure
*dsc
,
4978 unsigned int cond
, int exchange
, int link
, long offset
)
4980 /* Implement "BL<cond> <label>" as:
4982 Preparation: cond <- instruction condition
4983 Insn: mov r0, r0 (nop)
4984 Cleanup: if (condition true) { r14 <- pc; pc <- label }.
4986 B<cond> similar, but don't set r14 in cleanup. */
4988 dsc
->u
.branch
.cond
= cond
;
4989 dsc
->u
.branch
.link
= link
;
4990 dsc
->u
.branch
.exchange
= exchange
;
4992 dsc
->u
.branch
.dest
= dsc
->insn_addr
;
4993 if (link
&& exchange
)
4994 /* For BLX, offset is computed from the Align (PC, 4). */
4995 dsc
->u
.branch
.dest
= dsc
->u
.branch
.dest
& 0xfffffffc;
4998 dsc
->u
.branch
.dest
+= 4 + offset
;
5000 dsc
->u
.branch
.dest
+= 8 + offset
;
5002 dsc
->cleanup
= &cleanup_branch
;
5005 arm_copy_b_bl_blx (struct gdbarch
*gdbarch
, uint32_t insn
,
5006 struct regcache
*regs
, struct displaced_step_closure
*dsc
)
5008 unsigned int cond
= bits (insn
, 28, 31);
5009 int exchange
= (cond
== 0xf);
5010 int link
= exchange
|| bit (insn
, 24);
5013 if (debug_displaced
)
5014 fprintf_unfiltered (gdb_stdlog
, "displaced: copying %s immediate insn "
5015 "%.8lx\n", (exchange
) ? "blx" : (link
) ? "bl" : "b",
5016 (unsigned long) insn
);
5018 /* For BLX, set bit 0 of the destination. The cleanup_branch function will
5019 then arrange the switch into Thumb mode. */
5020 offset
= (bits (insn
, 0, 23) << 2) | (bit (insn
, 24) << 1) | 1;
5022 offset
= bits (insn
, 0, 23) << 2;
5024 if (bit (offset
, 25))
5025 offset
= offset
| ~0x3ffffff;
5027 dsc
->modinsn
[0] = ARM_NOP
;
5029 install_b_bl_blx (gdbarch
, regs
, dsc
, cond
, exchange
, link
, offset
);
5034 thumb2_copy_b_bl_blx (struct gdbarch
*gdbarch
, uint16_t insn1
,
5035 uint16_t insn2
, struct regcache
*regs
,
5036 struct displaced_step_closure
*dsc
)
5038 int link
= bit (insn2
, 14);
5039 int exchange
= link
&& !bit (insn2
, 12);
5042 int j1
= bit (insn2
, 13);
5043 int j2
= bit (insn2
, 11);
5044 int s
= sbits (insn1
, 10, 10);
5045 int i1
= !(j1
^ bit (insn1
, 10));
5046 int i2
= !(j2
^ bit (insn1
, 10));
5048 if (!link
&& !exchange
) /* B */
5050 offset
= (bits (insn2
, 0, 10) << 1);
5051 if (bit (insn2
, 12)) /* Encoding T4 */
5053 offset
|= (bits (insn1
, 0, 9) << 12)
5059 else /* Encoding T3 */
5061 offset
|= (bits (insn1
, 0, 5) << 12)
5065 cond
= bits (insn1
, 6, 9);
5070 offset
= (bits (insn1
, 0, 9) << 12);
5071 offset
|= ((i2
<< 22) | (i1
<< 23) | (s
<< 24));
5072 offset
|= exchange
?
5073 (bits (insn2
, 1, 10) << 2) : (bits (insn2
, 0, 10) << 1);
5076 if (debug_displaced
)
5077 fprintf_unfiltered (gdb_stdlog
, "displaced: copying %s insn "
5078 "%.4x %.4x with offset %.8lx\n",
5079 link
? (exchange
) ? "blx" : "bl" : "b",
5080 insn1
, insn2
, offset
);
5082 dsc
->modinsn
[0] = THUMB_NOP
;
5084 install_b_bl_blx (gdbarch
, regs
, dsc
, cond
, exchange
, link
, offset
);
5088 /* Copy B Thumb instructions. */
5090 thumb_copy_b (struct gdbarch
*gdbarch
, uint16_t insn
,
5091 struct displaced_step_closure
*dsc
)
5093 unsigned int cond
= 0;
5095 unsigned short bit_12_15
= bits (insn
, 12, 15);
5096 CORE_ADDR from
= dsc
->insn_addr
;
5098 if (bit_12_15
== 0xd)
5100 /* offset = SignExtend (imm8:0, 32) */
5101 offset
= sbits ((insn
<< 1), 0, 8);
5102 cond
= bits (insn
, 8, 11);
5104 else if (bit_12_15
== 0xe) /* Encoding T2 */
5106 offset
= sbits ((insn
<< 1), 0, 11);
5110 if (debug_displaced
)
5111 fprintf_unfiltered (gdb_stdlog
,
5112 "displaced: copying b immediate insn %.4x "
5113 "with offset %d\n", insn
, offset
);
5115 dsc
->u
.branch
.cond
= cond
;
5116 dsc
->u
.branch
.link
= 0;
5117 dsc
->u
.branch
.exchange
= 0;
5118 dsc
->u
.branch
.dest
= from
+ 4 + offset
;
5120 dsc
->modinsn
[0] = THUMB_NOP
;
5122 dsc
->cleanup
= &cleanup_branch
;
5127 /* Copy BX/BLX with register-specified destinations. */
5130 install_bx_blx_reg (struct gdbarch
*gdbarch
, struct regcache
*regs
,
5131 struct displaced_step_closure
*dsc
, int link
,
5132 unsigned int cond
, unsigned int rm
)
5134 /* Implement {BX,BLX}<cond> <reg>" as:
5136 Preparation: cond <- instruction condition
5137 Insn: mov r0, r0 (nop)
5138 Cleanup: if (condition true) { r14 <- pc; pc <- dest; }.
5140 Don't set r14 in cleanup for BX. */
5142 dsc
->u
.branch
.dest
= displaced_read_reg (regs
, dsc
, rm
);
5144 dsc
->u
.branch
.cond
= cond
;
5145 dsc
->u
.branch
.link
= link
;
5147 dsc
->u
.branch
.exchange
= 1;
5149 dsc
->cleanup
= &cleanup_branch
;
5153 arm_copy_bx_blx_reg (struct gdbarch
*gdbarch
, uint32_t insn
,
5154 struct regcache
*regs
, struct displaced_step_closure
*dsc
)
5156 unsigned int cond
= bits (insn
, 28, 31);
5159 int link
= bit (insn
, 5);
5160 unsigned int rm
= bits (insn
, 0, 3);
5162 if (debug_displaced
)
5163 fprintf_unfiltered (gdb_stdlog
, "displaced: copying insn %.8lx",
5164 (unsigned long) insn
);
5166 dsc
->modinsn
[0] = ARM_NOP
;
5168 install_bx_blx_reg (gdbarch
, regs
, dsc
, link
, cond
, rm
);
5173 thumb_copy_bx_blx_reg (struct gdbarch
*gdbarch
, uint16_t insn
,
5174 struct regcache
*regs
,
5175 struct displaced_step_closure
*dsc
)
5177 int link
= bit (insn
, 7);
5178 unsigned int rm
= bits (insn
, 3, 6);
5180 if (debug_displaced
)
5181 fprintf_unfiltered (gdb_stdlog
, "displaced: copying insn %.4x",
5182 (unsigned short) insn
);
5184 dsc
->modinsn
[0] = THUMB_NOP
;
5186 install_bx_blx_reg (gdbarch
, regs
, dsc
, link
, INST_AL
, rm
);
5192 /* Copy/cleanup arithmetic/logic instruction with immediate RHS. */
5195 cleanup_alu_imm (struct gdbarch
*gdbarch
,
5196 struct regcache
*regs
, struct displaced_step_closure
*dsc
)
5198 ULONGEST rd_val
= displaced_read_reg (regs
, dsc
, 0);
5199 displaced_write_reg (regs
, dsc
, 0, dsc
->tmp
[0], CANNOT_WRITE_PC
);
5200 displaced_write_reg (regs
, dsc
, 1, dsc
->tmp
[1], CANNOT_WRITE_PC
);
5201 displaced_write_reg (regs
, dsc
, dsc
->rd
, rd_val
, ALU_WRITE_PC
);
5205 arm_copy_alu_imm (struct gdbarch
*gdbarch
, uint32_t insn
, struct regcache
*regs
,
5206 struct displaced_step_closure
*dsc
)
5208 unsigned int rn
= bits (insn
, 16, 19);
5209 unsigned int rd
= bits (insn
, 12, 15);
5210 unsigned int op
= bits (insn
, 21, 24);
5211 int is_mov
= (op
== 0xd);
5212 ULONGEST rd_val
, rn_val
;
5214 if (!insn_references_pc (insn
, 0x000ff000ul
))
5215 return arm_copy_unmodified (gdbarch
, insn
, "ALU immediate", dsc
);
5217 if (debug_displaced
)
5218 fprintf_unfiltered (gdb_stdlog
, "displaced: copying immediate %s insn "
5219 "%.8lx\n", is_mov
? "move" : "ALU",
5220 (unsigned long) insn
);
5222 /* Instruction is of form:
5224 <op><cond> rd, [rn,] #imm
5228 Preparation: tmp1, tmp2 <- r0, r1;
5230 Insn: <op><cond> r0, r1, #imm
5231 Cleanup: rd <- r0; r0 <- tmp1; r1 <- tmp2
5234 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
5235 dsc
->tmp
[1] = displaced_read_reg (regs
, dsc
, 1);
5236 rn_val
= displaced_read_reg (regs
, dsc
, rn
);
5237 rd_val
= displaced_read_reg (regs
, dsc
, rd
);
5238 displaced_write_reg (regs
, dsc
, 0, rd_val
, CANNOT_WRITE_PC
);
5239 displaced_write_reg (regs
, dsc
, 1, rn_val
, CANNOT_WRITE_PC
);
5243 dsc
->modinsn
[0] = insn
& 0xfff00fff;
5245 dsc
->modinsn
[0] = (insn
& 0xfff00fff) | 0x10000;
5247 dsc
->cleanup
= &cleanup_alu_imm
;
5253 thumb2_copy_alu_imm (struct gdbarch
*gdbarch
, uint16_t insn1
,
5254 uint16_t insn2
, struct regcache
*regs
,
5255 struct displaced_step_closure
*dsc
)
5257 unsigned int op
= bits (insn1
, 5, 8);
5258 unsigned int rn
, rm
, rd
;
5259 ULONGEST rd_val
, rn_val
;
5261 rn
= bits (insn1
, 0, 3); /* Rn */
5262 rm
= bits (insn2
, 0, 3); /* Rm */
5263 rd
= bits (insn2
, 8, 11); /* Rd */
5265 /* This routine is only called for instruction MOV. */
5266 gdb_assert (op
== 0x2 && rn
== 0xf);
5268 if (rm
!= ARM_PC_REGNUM
&& rd
!= ARM_PC_REGNUM
)
5269 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
, "ALU imm", dsc
);
5271 if (debug_displaced
)
5272 fprintf_unfiltered (gdb_stdlog
, "displaced: copying reg %s insn %.4x%.4x\n",
5273 "ALU", insn1
, insn2
);
5275 /* Instruction is of form:
5277 <op><cond> rd, [rn,] #imm
5281 Preparation: tmp1, tmp2 <- r0, r1;
5283 Insn: <op><cond> r0, r1, #imm
5284 Cleanup: rd <- r0; r0 <- tmp1; r1 <- tmp2
5287 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
5288 dsc
->tmp
[1] = displaced_read_reg (regs
, dsc
, 1);
5289 rn_val
= displaced_read_reg (regs
, dsc
, rn
);
5290 rd_val
= displaced_read_reg (regs
, dsc
, rd
);
5291 displaced_write_reg (regs
, dsc
, 0, rd_val
, CANNOT_WRITE_PC
);
5292 displaced_write_reg (regs
, dsc
, 1, rn_val
, CANNOT_WRITE_PC
);
5295 dsc
->modinsn
[0] = insn1
;
5296 dsc
->modinsn
[1] = ((insn2
& 0xf0f0) | 0x1);
5299 dsc
->cleanup
= &cleanup_alu_imm
;
5304 /* Copy/cleanup arithmetic/logic insns with register RHS. */
5307 cleanup_alu_reg (struct gdbarch
*gdbarch
,
5308 struct regcache
*regs
, struct displaced_step_closure
*dsc
)
5313 rd_val
= displaced_read_reg (regs
, dsc
, 0);
5315 for (i
= 0; i
< 3; i
++)
5316 displaced_write_reg (regs
, dsc
, i
, dsc
->tmp
[i
], CANNOT_WRITE_PC
);
5318 displaced_write_reg (regs
, dsc
, dsc
->rd
, rd_val
, ALU_WRITE_PC
);
5322 install_alu_reg (struct gdbarch
*gdbarch
, struct regcache
*regs
,
5323 struct displaced_step_closure
*dsc
,
5324 unsigned int rd
, unsigned int rn
, unsigned int rm
)
5326 ULONGEST rd_val
, rn_val
, rm_val
;
5328 /* Instruction is of form:
5330 <op><cond> rd, [rn,] rm [, <shift>]
5334 Preparation: tmp1, tmp2, tmp3 <- r0, r1, r2;
5335 r0, r1, r2 <- rd, rn, rm
5336 Insn: <op><cond> r0, [r1,] r2 [, <shift>]
5337 Cleanup: rd <- r0; r0, r1, r2 <- tmp1, tmp2, tmp3
5340 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
5341 dsc
->tmp
[1] = displaced_read_reg (regs
, dsc
, 1);
5342 dsc
->tmp
[2] = displaced_read_reg (regs
, dsc
, 2);
5343 rd_val
= displaced_read_reg (regs
, dsc
, rd
);
5344 rn_val
= displaced_read_reg (regs
, dsc
, rn
);
5345 rm_val
= displaced_read_reg (regs
, dsc
, rm
);
5346 displaced_write_reg (regs
, dsc
, 0, rd_val
, CANNOT_WRITE_PC
);
5347 displaced_write_reg (regs
, dsc
, 1, rn_val
, CANNOT_WRITE_PC
);
5348 displaced_write_reg (regs
, dsc
, 2, rm_val
, CANNOT_WRITE_PC
);
5351 dsc
->cleanup
= &cleanup_alu_reg
;
5355 arm_copy_alu_reg (struct gdbarch
*gdbarch
, uint32_t insn
, struct regcache
*regs
,
5356 struct displaced_step_closure
*dsc
)
5358 unsigned int op
= bits (insn
, 21, 24);
5359 int is_mov
= (op
== 0xd);
5361 if (!insn_references_pc (insn
, 0x000ff00ful
))
5362 return arm_copy_unmodified (gdbarch
, insn
, "ALU reg", dsc
);
5364 if (debug_displaced
)
5365 fprintf_unfiltered (gdb_stdlog
, "displaced: copying reg %s insn %.8lx\n",
5366 is_mov
? "move" : "ALU", (unsigned long) insn
);
5369 dsc
->modinsn
[0] = (insn
& 0xfff00ff0) | 0x2;
5371 dsc
->modinsn
[0] = (insn
& 0xfff00ff0) | 0x10002;
5373 install_alu_reg (gdbarch
, regs
, dsc
, bits (insn
, 12, 15), bits (insn
, 16, 19),
5379 thumb_copy_alu_reg (struct gdbarch
*gdbarch
, uint16_t insn
,
5380 struct regcache
*regs
,
5381 struct displaced_step_closure
*dsc
)
5385 rm
= bits (insn
, 3, 6);
5386 rd
= (bit (insn
, 7) << 3) | bits (insn
, 0, 2);
5388 if (rd
!= ARM_PC_REGNUM
&& rm
!= ARM_PC_REGNUM
)
5389 return thumb_copy_unmodified_16bit (gdbarch
, insn
, "ALU reg", dsc
);
5391 if (debug_displaced
)
5392 fprintf_unfiltered (gdb_stdlog
, "displaced: copying ALU reg insn %.4x\n",
5393 (unsigned short) insn
);
5395 dsc
->modinsn
[0] = ((insn
& 0xff00) | 0x10);
5397 install_alu_reg (gdbarch
, regs
, dsc
, rd
, rd
, rm
);
5402 /* Cleanup/copy arithmetic/logic insns with shifted register RHS. */
5405 cleanup_alu_shifted_reg (struct gdbarch
*gdbarch
,
5406 struct regcache
*regs
,
5407 struct displaced_step_closure
*dsc
)
5409 ULONGEST rd_val
= displaced_read_reg (regs
, dsc
, 0);
5412 for (i
= 0; i
< 4; i
++)
5413 displaced_write_reg (regs
, dsc
, i
, dsc
->tmp
[i
], CANNOT_WRITE_PC
);
5415 displaced_write_reg (regs
, dsc
, dsc
->rd
, rd_val
, ALU_WRITE_PC
);
5419 install_alu_shifted_reg (struct gdbarch
*gdbarch
, struct regcache
*regs
,
5420 struct displaced_step_closure
*dsc
,
5421 unsigned int rd
, unsigned int rn
, unsigned int rm
,
5425 ULONGEST rd_val
, rn_val
, rm_val
, rs_val
;
5427 /* Instruction is of form:
5429 <op><cond> rd, [rn,] rm, <shift> rs
5433 Preparation: tmp1, tmp2, tmp3, tmp4 <- r0, r1, r2, r3
5434 r0, r1, r2, r3 <- rd, rn, rm, rs
5435 Insn: <op><cond> r0, r1, r2, <shift> r3
5437 r0, r1, r2, r3 <- tmp1, tmp2, tmp3, tmp4
5441 for (i
= 0; i
< 4; i
++)
5442 dsc
->tmp
[i
] = displaced_read_reg (regs
, dsc
, i
);
5444 rd_val
= displaced_read_reg (regs
, dsc
, rd
);
5445 rn_val
= displaced_read_reg (regs
, dsc
, rn
);
5446 rm_val
= displaced_read_reg (regs
, dsc
, rm
);
5447 rs_val
= displaced_read_reg (regs
, dsc
, rs
);
5448 displaced_write_reg (regs
, dsc
, 0, rd_val
, CANNOT_WRITE_PC
);
5449 displaced_write_reg (regs
, dsc
, 1, rn_val
, CANNOT_WRITE_PC
);
5450 displaced_write_reg (regs
, dsc
, 2, rm_val
, CANNOT_WRITE_PC
);
5451 displaced_write_reg (regs
, dsc
, 3, rs_val
, CANNOT_WRITE_PC
);
5453 dsc
->cleanup
= &cleanup_alu_shifted_reg
;
5457 arm_copy_alu_shifted_reg (struct gdbarch
*gdbarch
, uint32_t insn
,
5458 struct regcache
*regs
,
5459 struct displaced_step_closure
*dsc
)
5461 unsigned int op
= bits (insn
, 21, 24);
5462 int is_mov
= (op
== 0xd);
5463 unsigned int rd
, rn
, rm
, rs
;
5465 if (!insn_references_pc (insn
, 0x000fff0ful
))
5466 return arm_copy_unmodified (gdbarch
, insn
, "ALU shifted reg", dsc
);
5468 if (debug_displaced
)
5469 fprintf_unfiltered (gdb_stdlog
, "displaced: copying shifted reg %s insn "
5470 "%.8lx\n", is_mov
? "move" : "ALU",
5471 (unsigned long) insn
);
5473 rn
= bits (insn
, 16, 19);
5474 rm
= bits (insn
, 0, 3);
5475 rs
= bits (insn
, 8, 11);
5476 rd
= bits (insn
, 12, 15);
5479 dsc
->modinsn
[0] = (insn
& 0xfff000f0) | 0x302;
5481 dsc
->modinsn
[0] = (insn
& 0xfff000f0) | 0x10302;
5483 install_alu_shifted_reg (gdbarch
, regs
, dsc
, rd
, rn
, rm
, rs
);
5488 /* Clean up load instructions. */
5491 cleanup_load (struct gdbarch
*gdbarch
, struct regcache
*regs
,
5492 struct displaced_step_closure
*dsc
)
5494 ULONGEST rt_val
, rt_val2
= 0, rn_val
;
5496 rt_val
= displaced_read_reg (regs
, dsc
, 0);
5497 if (dsc
->u
.ldst
.xfersize
== 8)
5498 rt_val2
= displaced_read_reg (regs
, dsc
, 1);
5499 rn_val
= displaced_read_reg (regs
, dsc
, 2);
5501 displaced_write_reg (regs
, dsc
, 0, dsc
->tmp
[0], CANNOT_WRITE_PC
);
5502 if (dsc
->u
.ldst
.xfersize
> 4)
5503 displaced_write_reg (regs
, dsc
, 1, dsc
->tmp
[1], CANNOT_WRITE_PC
);
5504 displaced_write_reg (regs
, dsc
, 2, dsc
->tmp
[2], CANNOT_WRITE_PC
);
5505 if (!dsc
->u
.ldst
.immed
)
5506 displaced_write_reg (regs
, dsc
, 3, dsc
->tmp
[3], CANNOT_WRITE_PC
);
5508 /* Handle register writeback. */
5509 if (dsc
->u
.ldst
.writeback
)
5510 displaced_write_reg (regs
, dsc
, dsc
->u
.ldst
.rn
, rn_val
, CANNOT_WRITE_PC
);
5511 /* Put result in right place. */
5512 displaced_write_reg (regs
, dsc
, dsc
->rd
, rt_val
, LOAD_WRITE_PC
);
5513 if (dsc
->u
.ldst
.xfersize
== 8)
5514 displaced_write_reg (regs
, dsc
, dsc
->rd
+ 1, rt_val2
, LOAD_WRITE_PC
);
5517 /* Clean up store instructions. */
5520 cleanup_store (struct gdbarch
*gdbarch
, struct regcache
*regs
,
5521 struct displaced_step_closure
*dsc
)
5523 ULONGEST rn_val
= displaced_read_reg (regs
, dsc
, 2);
5525 displaced_write_reg (regs
, dsc
, 0, dsc
->tmp
[0], CANNOT_WRITE_PC
);
5526 if (dsc
->u
.ldst
.xfersize
> 4)
5527 displaced_write_reg (regs
, dsc
, 1, dsc
->tmp
[1], CANNOT_WRITE_PC
);
5528 displaced_write_reg (regs
, dsc
, 2, dsc
->tmp
[2], CANNOT_WRITE_PC
);
5529 if (!dsc
->u
.ldst
.immed
)
5530 displaced_write_reg (regs
, dsc
, 3, dsc
->tmp
[3], CANNOT_WRITE_PC
);
5531 if (!dsc
->u
.ldst
.restore_r4
)
5532 displaced_write_reg (regs
, dsc
, 4, dsc
->tmp
[4], CANNOT_WRITE_PC
);
5535 if (dsc
->u
.ldst
.writeback
)
5536 displaced_write_reg (regs
, dsc
, dsc
->u
.ldst
.rn
, rn_val
, CANNOT_WRITE_PC
);
5539 /* Copy "extra" load/store instructions. These are halfword/doubleword
5540 transfers, which have a different encoding to byte/word transfers. */
5543 arm_copy_extra_ld_st (struct gdbarch
*gdbarch
, uint32_t insn
, int unprivileged
,
5544 struct regcache
*regs
, struct displaced_step_closure
*dsc
)
5546 unsigned int op1
= bits (insn
, 20, 24);
5547 unsigned int op2
= bits (insn
, 5, 6);
5548 unsigned int rt
= bits (insn
, 12, 15);
5549 unsigned int rn
= bits (insn
, 16, 19);
5550 unsigned int rm
= bits (insn
, 0, 3);
5551 char load
[12] = {0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1};
5552 char bytesize
[12] = {2, 2, 2, 2, 8, 1, 8, 1, 8, 2, 8, 2};
5553 int immed
= (op1
& 0x4) != 0;
5555 ULONGEST rt_val
, rt_val2
= 0, rn_val
, rm_val
= 0;
5557 if (!insn_references_pc (insn
, 0x000ff00ful
))
5558 return arm_copy_unmodified (gdbarch
, insn
, "extra load/store", dsc
);
5560 if (debug_displaced
)
5561 fprintf_unfiltered (gdb_stdlog
, "displaced: copying %sextra load/store "
5562 "insn %.8lx\n", unprivileged
? "unprivileged " : "",
5563 (unsigned long) insn
);
5565 opcode
= ((op2
<< 2) | (op1
& 0x1) | ((op1
& 0x4) >> 1)) - 4;
5568 internal_error (__FILE__
, __LINE__
,
5569 _("copy_extra_ld_st: instruction decode error"));
5571 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
5572 dsc
->tmp
[1] = displaced_read_reg (regs
, dsc
, 1);
5573 dsc
->tmp
[2] = displaced_read_reg (regs
, dsc
, 2);
5575 dsc
->tmp
[3] = displaced_read_reg (regs
, dsc
, 3);
5577 rt_val
= displaced_read_reg (regs
, dsc
, rt
);
5578 if (bytesize
[opcode
] == 8)
5579 rt_val2
= displaced_read_reg (regs
, dsc
, rt
+ 1);
5580 rn_val
= displaced_read_reg (regs
, dsc
, rn
);
5582 rm_val
= displaced_read_reg (regs
, dsc
, rm
);
5584 displaced_write_reg (regs
, dsc
, 0, rt_val
, CANNOT_WRITE_PC
);
5585 if (bytesize
[opcode
] == 8)
5586 displaced_write_reg (regs
, dsc
, 1, rt_val2
, CANNOT_WRITE_PC
);
5587 displaced_write_reg (regs
, dsc
, 2, rn_val
, CANNOT_WRITE_PC
);
5589 displaced_write_reg (regs
, dsc
, 3, rm_val
, CANNOT_WRITE_PC
);
5592 dsc
->u
.ldst
.xfersize
= bytesize
[opcode
];
5593 dsc
->u
.ldst
.rn
= rn
;
5594 dsc
->u
.ldst
.immed
= immed
;
5595 dsc
->u
.ldst
.writeback
= bit (insn
, 24) == 0 || bit (insn
, 21) != 0;
5596 dsc
->u
.ldst
.restore_r4
= 0;
5599 /* {ldr,str}<width><cond> rt, [rt2,] [rn, #imm]
5601 {ldr,str}<width><cond> r0, [r1,] [r2, #imm]. */
5602 dsc
->modinsn
[0] = (insn
& 0xfff00fff) | 0x20000;
5604 /* {ldr,str}<width><cond> rt, [rt2,] [rn, +/-rm]
5606 {ldr,str}<width><cond> r0, [r1,] [r2, +/-r3]. */
5607 dsc
->modinsn
[0] = (insn
& 0xfff00ff0) | 0x20003;
5609 dsc
->cleanup
= load
[opcode
] ? &cleanup_load
: &cleanup_store
;
5614 /* Copy byte/half word/word loads and stores. */
5617 install_load_store (struct gdbarch
*gdbarch
, struct regcache
*regs
,
5618 struct displaced_step_closure
*dsc
, int load
,
5619 int immed
, int writeback
, int size
, int usermode
,
5620 int rt
, int rm
, int rn
)
5622 ULONGEST rt_val
, rn_val
, rm_val
= 0;
5624 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
5625 dsc
->tmp
[2] = displaced_read_reg (regs
, dsc
, 2);
5627 dsc
->tmp
[3] = displaced_read_reg (regs
, dsc
, 3);
5629 dsc
->tmp
[4] = displaced_read_reg (regs
, dsc
, 4);
5631 rt_val
= displaced_read_reg (regs
, dsc
, rt
);
5632 rn_val
= displaced_read_reg (regs
, dsc
, rn
);
5634 rm_val
= displaced_read_reg (regs
, dsc
, rm
);
5636 displaced_write_reg (regs
, dsc
, 0, rt_val
, CANNOT_WRITE_PC
);
5637 displaced_write_reg (regs
, dsc
, 2, rn_val
, CANNOT_WRITE_PC
);
5639 displaced_write_reg (regs
, dsc
, 3, rm_val
, CANNOT_WRITE_PC
);
5641 dsc
->u
.ldst
.xfersize
= size
;
5642 dsc
->u
.ldst
.rn
= rn
;
5643 dsc
->u
.ldst
.immed
= immed
;
5644 dsc
->u
.ldst
.writeback
= writeback
;
5646 /* To write PC we can do:
5648 Before this sequence of instructions:
5649 r0 is the PC value got from displaced_read_reg, so r0 = from + 8;
5650 r2 is the Rn value got from dispalced_read_reg.
5652 Insn1: push {pc} Write address of STR instruction + offset on stack
5653 Insn2: pop {r4} Read it back from stack, r4 = addr(Insn1) + offset
5654 Insn3: sub r4, r4, pc r4 = addr(Insn1) + offset - pc
5655 = addr(Insn1) + offset - addr(Insn3) - 8
5657 Insn4: add r4, r4, #8 r4 = offset - 8
5658 Insn5: add r0, r0, r4 r0 = from + 8 + offset - 8
5660 Insn6: str r0, [r2, #imm] (or str r0, [r2, r3])
5662 Otherwise we don't know what value to write for PC, since the offset is
5663 architecture-dependent (sometimes PC+8, sometimes PC+12). More details
5664 of this can be found in Section "Saving from r15" in
5665 http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0204g/Cihbjifh.html */
5667 dsc
->cleanup
= load
? &cleanup_load
: &cleanup_store
;
5672 thumb2_copy_load_literal (struct gdbarch
*gdbarch
, uint16_t insn1
,
5673 uint16_t insn2
, struct regcache
*regs
,
5674 struct displaced_step_closure
*dsc
, int size
)
5676 unsigned int u_bit
= bit (insn1
, 7);
5677 unsigned int rt
= bits (insn2
, 12, 15);
5678 int imm12
= bits (insn2
, 0, 11);
5681 if (debug_displaced
)
5682 fprintf_unfiltered (gdb_stdlog
,
5683 "displaced: copying ldr pc (0x%x) R%d %c imm12 %.4x\n",
5684 (unsigned int) dsc
->insn_addr
, rt
, u_bit
? '+' : '-',
5690 /* Rewrite instruction LDR Rt imm12 into:
5692 Prepare: tmp[0] <- r0, tmp[1] <- r2, tmp[2] <- r3, r2 <- pc, r3 <- imm12
5696 Cleanup: rt <- r0, r0 <- tmp[0], r2 <- tmp[1], r3 <- tmp[2]. */
5699 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
5700 dsc
->tmp
[2] = displaced_read_reg (regs
, dsc
, 2);
5701 dsc
->tmp
[3] = displaced_read_reg (regs
, dsc
, 3);
5703 pc_val
= displaced_read_reg (regs
, dsc
, ARM_PC_REGNUM
);
5705 pc_val
= pc_val
& 0xfffffffc;
5707 displaced_write_reg (regs
, dsc
, 2, pc_val
, CANNOT_WRITE_PC
);
5708 displaced_write_reg (regs
, dsc
, 3, imm12
, CANNOT_WRITE_PC
);
5712 dsc
->u
.ldst
.xfersize
= size
;
5713 dsc
->u
.ldst
.immed
= 0;
5714 dsc
->u
.ldst
.writeback
= 0;
5715 dsc
->u
.ldst
.restore_r4
= 0;
5717 /* LDR R0, R2, R3 */
5718 dsc
->modinsn
[0] = 0xf852;
5719 dsc
->modinsn
[1] = 0x3;
5722 dsc
->cleanup
= &cleanup_load
;
5728 thumb2_copy_load_reg_imm (struct gdbarch
*gdbarch
, uint16_t insn1
,
5729 uint16_t insn2
, struct regcache
*regs
,
5730 struct displaced_step_closure
*dsc
,
5731 int writeback
, int immed
)
5733 unsigned int rt
= bits (insn2
, 12, 15);
5734 unsigned int rn
= bits (insn1
, 0, 3);
5735 unsigned int rm
= bits (insn2
, 0, 3); /* Only valid if !immed. */
5736 /* In LDR (register), there is also a register Rm, which is not allowed to
5737 be PC, so we don't have to check it. */
5739 if (rt
!= ARM_PC_REGNUM
&& rn
!= ARM_PC_REGNUM
)
5740 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
, "load",
5743 if (debug_displaced
)
5744 fprintf_unfiltered (gdb_stdlog
,
5745 "displaced: copying ldr r%d [r%d] insn %.4x%.4x\n",
5746 rt
, rn
, insn1
, insn2
);
5748 install_load_store (gdbarch
, regs
, dsc
, 1, immed
, writeback
, 4,
5751 dsc
->u
.ldst
.restore_r4
= 0;
5754 /* ldr[b]<cond> rt, [rn, #imm], etc.
5756 ldr[b]<cond> r0, [r2, #imm]. */
5758 dsc
->modinsn
[0] = (insn1
& 0xfff0) | 0x2;
5759 dsc
->modinsn
[1] = insn2
& 0x0fff;
5762 /* ldr[b]<cond> rt, [rn, rm], etc.
5764 ldr[b]<cond> r0, [r2, r3]. */
5766 dsc
->modinsn
[0] = (insn1
& 0xfff0) | 0x2;
5767 dsc
->modinsn
[1] = (insn2
& 0x0ff0) | 0x3;
5777 arm_copy_ldr_str_ldrb_strb (struct gdbarch
*gdbarch
, uint32_t insn
,
5778 struct regcache
*regs
,
5779 struct displaced_step_closure
*dsc
,
5780 int load
, int size
, int usermode
)
5782 int immed
= !bit (insn
, 25);
5783 int writeback
= (bit (insn
, 24) == 0 || bit (insn
, 21) != 0);
5784 unsigned int rt
= bits (insn
, 12, 15);
5785 unsigned int rn
= bits (insn
, 16, 19);
5786 unsigned int rm
= bits (insn
, 0, 3); /* Only valid if !immed. */
5788 if (!insn_references_pc (insn
, 0x000ff00ful
))
5789 return arm_copy_unmodified (gdbarch
, insn
, "load/store", dsc
);
5791 if (debug_displaced
)
5792 fprintf_unfiltered (gdb_stdlog
,
5793 "displaced: copying %s%s r%d [r%d] insn %.8lx\n",
5794 load
? (size
== 1 ? "ldrb" : "ldr")
5795 : (size
== 1 ? "strb" : "str"), usermode
? "t" : "",
5797 (unsigned long) insn
);
5799 install_load_store (gdbarch
, regs
, dsc
, load
, immed
, writeback
, size
,
5800 usermode
, rt
, rm
, rn
);
5802 if (load
|| rt
!= ARM_PC_REGNUM
)
5804 dsc
->u
.ldst
.restore_r4
= 0;
5807 /* {ldr,str}[b]<cond> rt, [rn, #imm], etc.
5809 {ldr,str}[b]<cond> r0, [r2, #imm]. */
5810 dsc
->modinsn
[0] = (insn
& 0xfff00fff) | 0x20000;
5812 /* {ldr,str}[b]<cond> rt, [rn, rm], etc.
5814 {ldr,str}[b]<cond> r0, [r2, r3]. */
5815 dsc
->modinsn
[0] = (insn
& 0xfff00ff0) | 0x20003;
5819 /* We need to use r4 as scratch. Make sure it's restored afterwards. */
5820 dsc
->u
.ldst
.restore_r4
= 1;
5821 dsc
->modinsn
[0] = 0xe92d8000; /* push {pc} */
5822 dsc
->modinsn
[1] = 0xe8bd0010; /* pop {r4} */
5823 dsc
->modinsn
[2] = 0xe044400f; /* sub r4, r4, pc. */
5824 dsc
->modinsn
[3] = 0xe2844008; /* add r4, r4, #8. */
5825 dsc
->modinsn
[4] = 0xe0800004; /* add r0, r0, r4. */
5829 dsc
->modinsn
[5] = (insn
& 0xfff00fff) | 0x20000;
5831 dsc
->modinsn
[5] = (insn
& 0xfff00ff0) | 0x20003;
5836 dsc
->cleanup
= load
? &cleanup_load
: &cleanup_store
;
5841 /* Cleanup LDM instructions with fully-populated register list. This is an
5842 unfortunate corner case: it's impossible to implement correctly by modifying
5843 the instruction. The issue is as follows: we have an instruction,
5847 which we must rewrite to avoid loading PC. A possible solution would be to
5848 do the load in two halves, something like (with suitable cleanup
5852 ldm[id][ab] r8!, {r0-r7}
5854 ldm[id][ab] r8, {r7-r14}
5857 but at present there's no suitable place for <temp>, since the scratch space
5858 is overwritten before the cleanup routine is called. For now, we simply
5859 emulate the instruction. */
5862 cleanup_block_load_all (struct gdbarch
*gdbarch
, struct regcache
*regs
,
5863 struct displaced_step_closure
*dsc
)
5865 int inc
= dsc
->u
.block
.increment
;
5866 int bump_before
= dsc
->u
.block
.before
? (inc
? 4 : -4) : 0;
5867 int bump_after
= dsc
->u
.block
.before
? 0 : (inc
? 4 : -4);
5868 uint32_t regmask
= dsc
->u
.block
.regmask
;
5869 int regno
= inc
? 0 : 15;
5870 CORE_ADDR xfer_addr
= dsc
->u
.block
.xfer_addr
;
5871 int exception_return
= dsc
->u
.block
.load
&& dsc
->u
.block
.user
5872 && (regmask
& 0x8000) != 0;
5873 uint32_t status
= displaced_read_reg (regs
, dsc
, ARM_PS_REGNUM
);
5874 int do_transfer
= condition_true (dsc
->u
.block
.cond
, status
);
5875 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
5880 /* If the instruction is ldm rN, {...pc}^, I don't think there's anything
5881 sensible we can do here. Complain loudly. */
5882 if (exception_return
)
5883 error (_("Cannot single-step exception return"));
5885 /* We don't handle any stores here for now. */
5886 gdb_assert (dsc
->u
.block
.load
!= 0);
5888 if (debug_displaced
)
5889 fprintf_unfiltered (gdb_stdlog
, "displaced: emulating block transfer: "
5890 "%s %s %s\n", dsc
->u
.block
.load
? "ldm" : "stm",
5891 dsc
->u
.block
.increment
? "inc" : "dec",
5892 dsc
->u
.block
.before
? "before" : "after");
5899 while (regno
<= ARM_PC_REGNUM
&& (regmask
& (1 << regno
)) == 0)
5902 while (regno
>= 0 && (regmask
& (1 << regno
)) == 0)
5905 xfer_addr
+= bump_before
;
5907 memword
= read_memory_unsigned_integer (xfer_addr
, 4, byte_order
);
5908 displaced_write_reg (regs
, dsc
, regno
, memword
, LOAD_WRITE_PC
);
5910 xfer_addr
+= bump_after
;
5912 regmask
&= ~(1 << regno
);
5915 if (dsc
->u
.block
.writeback
)
5916 displaced_write_reg (regs
, dsc
, dsc
->u
.block
.rn
, xfer_addr
,
5920 /* Clean up an STM which included the PC in the register list. */
5923 cleanup_block_store_pc (struct gdbarch
*gdbarch
, struct regcache
*regs
,
5924 struct displaced_step_closure
*dsc
)
5926 uint32_t status
= displaced_read_reg (regs
, dsc
, ARM_PS_REGNUM
);
5927 int store_executed
= condition_true (dsc
->u
.block
.cond
, status
);
5928 CORE_ADDR pc_stored_at
, transferred_regs
= bitcount (dsc
->u
.block
.regmask
);
5929 CORE_ADDR stm_insn_addr
;
5932 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
5934 /* If condition code fails, there's nothing else to do. */
5935 if (!store_executed
)
5938 if (dsc
->u
.block
.increment
)
5940 pc_stored_at
= dsc
->u
.block
.xfer_addr
+ 4 * transferred_regs
;
5942 if (dsc
->u
.block
.before
)
5947 pc_stored_at
= dsc
->u
.block
.xfer_addr
;
5949 if (dsc
->u
.block
.before
)
5953 pc_val
= read_memory_unsigned_integer (pc_stored_at
, 4, byte_order
);
5954 stm_insn_addr
= dsc
->scratch_base
;
5955 offset
= pc_val
- stm_insn_addr
;
5957 if (debug_displaced
)
5958 fprintf_unfiltered (gdb_stdlog
, "displaced: detected PC offset %.8lx for "
5959 "STM instruction\n", offset
);
5961 /* Rewrite the stored PC to the proper value for the non-displaced original
5963 write_memory_unsigned_integer (pc_stored_at
, 4, byte_order
,
5964 dsc
->insn_addr
+ offset
);
5967 /* Clean up an LDM which includes the PC in the register list. We clumped all
5968 the registers in the transferred list into a contiguous range r0...rX (to
5969 avoid loading PC directly and losing control of the debugged program), so we
5970 must undo that here. */
5973 cleanup_block_load_pc (struct gdbarch
*gdbarch
,
5974 struct regcache
*regs
,
5975 struct displaced_step_closure
*dsc
)
5977 uint32_t status
= displaced_read_reg (regs
, dsc
, ARM_PS_REGNUM
);
5978 int load_executed
= condition_true (dsc
->u
.block
.cond
, status
);
5979 unsigned int mask
= dsc
->u
.block
.regmask
, write_reg
= ARM_PC_REGNUM
;
5980 unsigned int regs_loaded
= bitcount (mask
);
5981 unsigned int num_to_shuffle
= regs_loaded
, clobbered
;
5983 /* The method employed here will fail if the register list is fully populated
5984 (we need to avoid loading PC directly). */
5985 gdb_assert (num_to_shuffle
< 16);
5990 clobbered
= (1 << num_to_shuffle
) - 1;
5992 while (num_to_shuffle
> 0)
5994 if ((mask
& (1 << write_reg
)) != 0)
5996 unsigned int read_reg
= num_to_shuffle
- 1;
5998 if (read_reg
!= write_reg
)
6000 ULONGEST rval
= displaced_read_reg (regs
, dsc
, read_reg
);
6001 displaced_write_reg (regs
, dsc
, write_reg
, rval
, LOAD_WRITE_PC
);
6002 if (debug_displaced
)
6003 fprintf_unfiltered (gdb_stdlog
, _("displaced: LDM: move "
6004 "loaded register r%d to r%d\n"), read_reg
,
6007 else if (debug_displaced
)
6008 fprintf_unfiltered (gdb_stdlog
, _("displaced: LDM: register "
6009 "r%d already in the right place\n"),
6012 clobbered
&= ~(1 << write_reg
);
6020 /* Restore any registers we scribbled over. */
6021 for (write_reg
= 0; clobbered
!= 0; write_reg
++)
6023 if ((clobbered
& (1 << write_reg
)) != 0)
6025 displaced_write_reg (regs
, dsc
, write_reg
, dsc
->tmp
[write_reg
],
6027 if (debug_displaced
)
6028 fprintf_unfiltered (gdb_stdlog
, _("displaced: LDM: restored "
6029 "clobbered register r%d\n"), write_reg
);
6030 clobbered
&= ~(1 << write_reg
);
6034 /* Perform register writeback manually. */
6035 if (dsc
->u
.block
.writeback
)
6037 ULONGEST new_rn_val
= dsc
->u
.block
.xfer_addr
;
6039 if (dsc
->u
.block
.increment
)
6040 new_rn_val
+= regs_loaded
* 4;
6042 new_rn_val
-= regs_loaded
* 4;
6044 displaced_write_reg (regs
, dsc
, dsc
->u
.block
.rn
, new_rn_val
,
6049 /* Handle ldm/stm, apart from some tricky cases which are unlikely to occur
6050 in user-level code (in particular exception return, ldm rn, {...pc}^). */
6053 arm_copy_block_xfer (struct gdbarch
*gdbarch
, uint32_t insn
,
6054 struct regcache
*regs
,
6055 struct displaced_step_closure
*dsc
)
6057 int load
= bit (insn
, 20);
6058 int user
= bit (insn
, 22);
6059 int increment
= bit (insn
, 23);
6060 int before
= bit (insn
, 24);
6061 int writeback
= bit (insn
, 21);
6062 int rn
= bits (insn
, 16, 19);
6064 /* Block transfers which don't mention PC can be run directly
6066 if (rn
!= ARM_PC_REGNUM
&& (insn
& 0x8000) == 0)
6067 return arm_copy_unmodified (gdbarch
, insn
, "ldm/stm", dsc
);
6069 if (rn
== ARM_PC_REGNUM
)
6071 warning (_("displaced: Unpredictable LDM or STM with "
6072 "base register r15"));
6073 return arm_copy_unmodified (gdbarch
, insn
, "unpredictable ldm/stm", dsc
);
6076 if (debug_displaced
)
6077 fprintf_unfiltered (gdb_stdlog
, "displaced: copying block transfer insn "
6078 "%.8lx\n", (unsigned long) insn
);
6080 dsc
->u
.block
.xfer_addr
= displaced_read_reg (regs
, dsc
, rn
);
6081 dsc
->u
.block
.rn
= rn
;
6083 dsc
->u
.block
.load
= load
;
6084 dsc
->u
.block
.user
= user
;
6085 dsc
->u
.block
.increment
= increment
;
6086 dsc
->u
.block
.before
= before
;
6087 dsc
->u
.block
.writeback
= writeback
;
6088 dsc
->u
.block
.cond
= bits (insn
, 28, 31);
6090 dsc
->u
.block
.regmask
= insn
& 0xffff;
6094 if ((insn
& 0xffff) == 0xffff)
6096 /* LDM with a fully-populated register list. This case is
6097 particularly tricky. Implement for now by fully emulating the
6098 instruction (which might not behave perfectly in all cases, but
6099 these instructions should be rare enough for that not to matter
6101 dsc
->modinsn
[0] = ARM_NOP
;
6103 dsc
->cleanup
= &cleanup_block_load_all
;
6107 /* LDM of a list of registers which includes PC. Implement by
6108 rewriting the list of registers to be transferred into a
6109 contiguous chunk r0...rX before doing the transfer, then shuffling
6110 registers into the correct places in the cleanup routine. */
6111 unsigned int regmask
= insn
& 0xffff;
6112 unsigned int num_in_list
= bitcount (regmask
), new_regmask
;
6115 for (i
= 0; i
< num_in_list
; i
++)
6116 dsc
->tmp
[i
] = displaced_read_reg (regs
, dsc
, i
);
6118 /* Writeback makes things complicated. We need to avoid clobbering
6119 the base register with one of the registers in our modified
6120 register list, but just using a different register can't work in
6123 ldm r14!, {r0-r13,pc}
6125 which would need to be rewritten as:
6129 but that can't work, because there's no free register for N.
6131 Solve this by turning off the writeback bit, and emulating
6132 writeback manually in the cleanup routine. */
6137 new_regmask
= (1 << num_in_list
) - 1;
6139 if (debug_displaced
)
6140 fprintf_unfiltered (gdb_stdlog
, _("displaced: LDM r%d%s, "
6141 "{..., pc}: original reg list %.4x, modified "
6142 "list %.4x\n"), rn
, writeback
? "!" : "",
6143 (int) insn
& 0xffff, new_regmask
);
6145 dsc
->modinsn
[0] = (insn
& ~0xffff) | (new_regmask
& 0xffff);
6147 dsc
->cleanup
= &cleanup_block_load_pc
;
6152 /* STM of a list of registers which includes PC. Run the instruction
6153 as-is, but out of line: this will store the wrong value for the PC,
6154 so we must manually fix up the memory in the cleanup routine.
6155 Doing things this way has the advantage that we can auto-detect
6156 the offset of the PC write (which is architecture-dependent) in
6157 the cleanup routine. */
6158 dsc
->modinsn
[0] = insn
;
6160 dsc
->cleanup
= &cleanup_block_store_pc
;
6167 thumb2_copy_block_xfer (struct gdbarch
*gdbarch
, uint16_t insn1
, uint16_t insn2
,
6168 struct regcache
*regs
,
6169 struct displaced_step_closure
*dsc
)
6171 int rn
= bits (insn1
, 0, 3);
6172 int load
= bit (insn1
, 4);
6173 int writeback
= bit (insn1
, 5);
6175 /* Block transfers which don't mention PC can be run directly
6177 if (rn
!= ARM_PC_REGNUM
&& (insn2
& 0x8000) == 0)
6178 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
, "ldm/stm", dsc
);
6180 if (rn
== ARM_PC_REGNUM
)
6182 warning (_("displaced: Unpredictable LDM or STM with "
6183 "base register r15"));
6184 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
6185 "unpredictable ldm/stm", dsc
);
6188 if (debug_displaced
)
6189 fprintf_unfiltered (gdb_stdlog
, "displaced: copying block transfer insn "
6190 "%.4x%.4x\n", insn1
, insn2
);
6192 /* Clear bit 13, since it should be always zero. */
6193 dsc
->u
.block
.regmask
= (insn2
& 0xdfff);
6194 dsc
->u
.block
.rn
= rn
;
6196 dsc
->u
.block
.load
= load
;
6197 dsc
->u
.block
.user
= 0;
6198 dsc
->u
.block
.increment
= bit (insn1
, 7);
6199 dsc
->u
.block
.before
= bit (insn1
, 8);
6200 dsc
->u
.block
.writeback
= writeback
;
6201 dsc
->u
.block
.cond
= INST_AL
;
6202 dsc
->u
.block
.xfer_addr
= displaced_read_reg (regs
, dsc
, rn
);
6206 if (dsc
->u
.block
.regmask
== 0xffff)
6208 /* This branch is impossible to happen. */
6213 unsigned int regmask
= dsc
->u
.block
.regmask
;
6214 unsigned int num_in_list
= bitcount (regmask
), new_regmask
;
6217 for (i
= 0; i
< num_in_list
; i
++)
6218 dsc
->tmp
[i
] = displaced_read_reg (regs
, dsc
, i
);
6223 new_regmask
= (1 << num_in_list
) - 1;
6225 if (debug_displaced
)
6226 fprintf_unfiltered (gdb_stdlog
, _("displaced: LDM r%d%s, "
6227 "{..., pc}: original reg list %.4x, modified "
6228 "list %.4x\n"), rn
, writeback
? "!" : "",
6229 (int) dsc
->u
.block
.regmask
, new_regmask
);
6231 dsc
->modinsn
[0] = insn1
;
6232 dsc
->modinsn
[1] = (new_regmask
& 0xffff);
6235 dsc
->cleanup
= &cleanup_block_load_pc
;
6240 dsc
->modinsn
[0] = insn1
;
6241 dsc
->modinsn
[1] = insn2
;
6243 dsc
->cleanup
= &cleanup_block_store_pc
;
6248 /* Wrapper over read_memory_unsigned_integer for use in arm_get_next_pcs.
6249 This is used to avoid a dependency on BFD's bfd_endian enum. */
6252 arm_get_next_pcs_read_memory_unsigned_integer (CORE_ADDR memaddr
, int len
,
6255 return read_memory_unsigned_integer (memaddr
, len
,
6256 (enum bfd_endian
) byte_order
);
6259 /* Wrapper over gdbarch_addr_bits_remove for use in arm_get_next_pcs. */
6262 arm_get_next_pcs_addr_bits_remove (struct arm_get_next_pcs
*self
,
6265 return gdbarch_addr_bits_remove (get_regcache_arch (self
->regcache
), val
);
6268 /* Wrapper over syscall_next_pc for use in get_next_pcs. */
6271 arm_get_next_pcs_syscall_next_pc (struct arm_get_next_pcs
*self
)
6276 /* Wrapper over arm_is_thumb for use in arm_get_next_pcs. */
6279 arm_get_next_pcs_is_thumb (struct arm_get_next_pcs
*self
)
6281 return arm_is_thumb (self
->regcache
);
6284 /* single_step() is called just before we want to resume the inferior,
6285 if we want to single-step it but there is no hardware or kernel
6286 single-step support. We find the target of the coming instructions
6287 and breakpoint them. */
6290 arm_software_single_step (struct frame_info
*frame
)
6292 struct regcache
*regcache
= get_current_regcache ();
6293 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
6294 struct arm_get_next_pcs next_pcs_ctx
;
6297 VEC (CORE_ADDR
) *next_pcs
= NULL
;
6298 struct cleanup
*old_chain
= make_cleanup (VEC_cleanup (CORE_ADDR
), &next_pcs
);
6300 arm_get_next_pcs_ctor (&next_pcs_ctx
,
6301 &arm_get_next_pcs_ops
,
6302 gdbarch_byte_order (gdbarch
),
6303 gdbarch_byte_order_for_code (gdbarch
),
6307 next_pcs
= arm_get_next_pcs (&next_pcs_ctx
);
6309 for (i
= 0; VEC_iterate (CORE_ADDR
, next_pcs
, i
, pc
); i
++)
6311 pc
= gdbarch_addr_bits_remove (gdbarch
, pc
);
6312 VEC_replace (CORE_ADDR
, next_pcs
, i
, pc
);
6315 discard_cleanups (old_chain
);
6320 /* Cleanup/copy SVC (SWI) instructions. These two functions are overridden
6321 for Linux, where some SVC instructions must be treated specially. */
6324 cleanup_svc (struct gdbarch
*gdbarch
, struct regcache
*regs
,
6325 struct displaced_step_closure
*dsc
)
6327 CORE_ADDR resume_addr
= dsc
->insn_addr
+ dsc
->insn_size
;
6329 if (debug_displaced
)
6330 fprintf_unfiltered (gdb_stdlog
, "displaced: cleanup for svc, resume at "
6331 "%.8lx\n", (unsigned long) resume_addr
);
6333 displaced_write_reg (regs
, dsc
, ARM_PC_REGNUM
, resume_addr
, BRANCH_WRITE_PC
);
6337 /* Common copy routine for svc instruciton. */
6340 install_svc (struct gdbarch
*gdbarch
, struct regcache
*regs
,
6341 struct displaced_step_closure
*dsc
)
6343 /* Preparation: none.
6344 Insn: unmodified svc.
6345 Cleanup: pc <- insn_addr + insn_size. */
6347 /* Pretend we wrote to the PC, so cleanup doesn't set PC to the next
6349 dsc
->wrote_to_pc
= 1;
6351 /* Allow OS-specific code to override SVC handling. */
6352 if (dsc
->u
.svc
.copy_svc_os
)
6353 return dsc
->u
.svc
.copy_svc_os (gdbarch
, regs
, dsc
);
6356 dsc
->cleanup
= &cleanup_svc
;
6362 arm_copy_svc (struct gdbarch
*gdbarch
, uint32_t insn
,
6363 struct regcache
*regs
, struct displaced_step_closure
*dsc
)
6366 if (debug_displaced
)
6367 fprintf_unfiltered (gdb_stdlog
, "displaced: copying svc insn %.8lx\n",
6368 (unsigned long) insn
);
6370 dsc
->modinsn
[0] = insn
;
6372 return install_svc (gdbarch
, regs
, dsc
);
6376 thumb_copy_svc (struct gdbarch
*gdbarch
, uint16_t insn
,
6377 struct regcache
*regs
, struct displaced_step_closure
*dsc
)
6380 if (debug_displaced
)
6381 fprintf_unfiltered (gdb_stdlog
, "displaced: copying svc insn %.4x\n",
6384 dsc
->modinsn
[0] = insn
;
6386 return install_svc (gdbarch
, regs
, dsc
);
6389 /* Copy undefined instructions. */
6392 arm_copy_undef (struct gdbarch
*gdbarch
, uint32_t insn
,
6393 struct displaced_step_closure
*dsc
)
6395 if (debug_displaced
)
6396 fprintf_unfiltered (gdb_stdlog
,
6397 "displaced: copying undefined insn %.8lx\n",
6398 (unsigned long) insn
);
6400 dsc
->modinsn
[0] = insn
;
6406 thumb_32bit_copy_undef (struct gdbarch
*gdbarch
, uint16_t insn1
, uint16_t insn2
,
6407 struct displaced_step_closure
*dsc
)
6410 if (debug_displaced
)
6411 fprintf_unfiltered (gdb_stdlog
, "displaced: copying undefined insn "
6412 "%.4x %.4x\n", (unsigned short) insn1
,
6413 (unsigned short) insn2
);
6415 dsc
->modinsn
[0] = insn1
;
6416 dsc
->modinsn
[1] = insn2
;
6422 /* Copy unpredictable instructions. */
6425 arm_copy_unpred (struct gdbarch
*gdbarch
, uint32_t insn
,
6426 struct displaced_step_closure
*dsc
)
6428 if (debug_displaced
)
6429 fprintf_unfiltered (gdb_stdlog
, "displaced: copying unpredictable insn "
6430 "%.8lx\n", (unsigned long) insn
);
6432 dsc
->modinsn
[0] = insn
;
6437 /* The decode_* functions are instruction decoding helpers. They mostly follow
6438 the presentation in the ARM ARM. */
6441 arm_decode_misc_memhint_neon (struct gdbarch
*gdbarch
, uint32_t insn
,
6442 struct regcache
*regs
,
6443 struct displaced_step_closure
*dsc
)
6445 unsigned int op1
= bits (insn
, 20, 26), op2
= bits (insn
, 4, 7);
6446 unsigned int rn
= bits (insn
, 16, 19);
6448 if (op1
== 0x10 && (op2
& 0x2) == 0x0 && (rn
& 0xe) == 0x0)
6449 return arm_copy_unmodified (gdbarch
, insn
, "cps", dsc
);
6450 else if (op1
== 0x10 && op2
== 0x0 && (rn
& 0xe) == 0x1)
6451 return arm_copy_unmodified (gdbarch
, insn
, "setend", dsc
);
6452 else if ((op1
& 0x60) == 0x20)
6453 return arm_copy_unmodified (gdbarch
, insn
, "neon dataproc", dsc
);
6454 else if ((op1
& 0x71) == 0x40)
6455 return arm_copy_unmodified (gdbarch
, insn
, "neon elt/struct load/store",
6457 else if ((op1
& 0x77) == 0x41)
6458 return arm_copy_unmodified (gdbarch
, insn
, "unallocated mem hint", dsc
);
6459 else if ((op1
& 0x77) == 0x45)
6460 return arm_copy_preload (gdbarch
, insn
, regs
, dsc
); /* pli. */
6461 else if ((op1
& 0x77) == 0x51)
6464 return arm_copy_preload (gdbarch
, insn
, regs
, dsc
); /* pld/pldw. */
6466 return arm_copy_unpred (gdbarch
, insn
, dsc
);
6468 else if ((op1
& 0x77) == 0x55)
6469 return arm_copy_preload (gdbarch
, insn
, regs
, dsc
); /* pld/pldw. */
6470 else if (op1
== 0x57)
6473 case 0x1: return arm_copy_unmodified (gdbarch
, insn
, "clrex", dsc
);
6474 case 0x4: return arm_copy_unmodified (gdbarch
, insn
, "dsb", dsc
);
6475 case 0x5: return arm_copy_unmodified (gdbarch
, insn
, "dmb", dsc
);
6476 case 0x6: return arm_copy_unmodified (gdbarch
, insn
, "isb", dsc
);
6477 default: return arm_copy_unpred (gdbarch
, insn
, dsc
);
6479 else if ((op1
& 0x63) == 0x43)
6480 return arm_copy_unpred (gdbarch
, insn
, dsc
);
6481 else if ((op2
& 0x1) == 0x0)
6482 switch (op1
& ~0x80)
6485 return arm_copy_unmodified (gdbarch
, insn
, "unallocated mem hint", dsc
);
6487 return arm_copy_preload_reg (gdbarch
, insn
, regs
, dsc
); /* pli reg. */
6488 case 0x71: case 0x75:
6490 return arm_copy_preload_reg (gdbarch
, insn
, regs
, dsc
);
6491 case 0x63: case 0x67: case 0x73: case 0x77:
6492 return arm_copy_unpred (gdbarch
, insn
, dsc
);
6494 return arm_copy_undef (gdbarch
, insn
, dsc
);
6497 return arm_copy_undef (gdbarch
, insn
, dsc
); /* Probably unreachable. */
6501 arm_decode_unconditional (struct gdbarch
*gdbarch
, uint32_t insn
,
6502 struct regcache
*regs
,
6503 struct displaced_step_closure
*dsc
)
6505 if (bit (insn
, 27) == 0)
6506 return arm_decode_misc_memhint_neon (gdbarch
, insn
, regs
, dsc
);
6507 /* Switch on bits: 0bxxxxx321xxx0xxxxxxxxxxxxxxxxxxxx. */
6508 else switch (((insn
& 0x7000000) >> 23) | ((insn
& 0x100000) >> 20))
6511 return arm_copy_unmodified (gdbarch
, insn
, "srs", dsc
);
6514 return arm_copy_unmodified (gdbarch
, insn
, "rfe", dsc
);
6516 case 0x4: case 0x5: case 0x6: case 0x7:
6517 return arm_copy_b_bl_blx (gdbarch
, insn
, regs
, dsc
);
6520 switch ((insn
& 0xe00000) >> 21)
6522 case 0x1: case 0x3: case 0x4: case 0x5: case 0x6: case 0x7:
6524 return arm_copy_copro_load_store (gdbarch
, insn
, regs
, dsc
);
6527 return arm_copy_unmodified (gdbarch
, insn
, "mcrr/mcrr2", dsc
);
6530 return arm_copy_undef (gdbarch
, insn
, dsc
);
6535 int rn_f
= (bits (insn
, 16, 19) == 0xf);
6536 switch ((insn
& 0xe00000) >> 21)
6539 /* ldc/ldc2 imm (undefined for rn == pc). */
6540 return rn_f
? arm_copy_undef (gdbarch
, insn
, dsc
)
6541 : arm_copy_copro_load_store (gdbarch
, insn
, regs
, dsc
);
6544 return arm_copy_unmodified (gdbarch
, insn
, "mrrc/mrrc2", dsc
);
6546 case 0x4: case 0x5: case 0x6: case 0x7:
6547 /* ldc/ldc2 lit (undefined for rn != pc). */
6548 return rn_f
? arm_copy_copro_load_store (gdbarch
, insn
, regs
, dsc
)
6549 : arm_copy_undef (gdbarch
, insn
, dsc
);
6552 return arm_copy_undef (gdbarch
, insn
, dsc
);
6557 return arm_copy_unmodified (gdbarch
, insn
, "stc/stc2", dsc
);
6560 if (bits (insn
, 16, 19) == 0xf)
6562 return arm_copy_copro_load_store (gdbarch
, insn
, regs
, dsc
);
6564 return arm_copy_undef (gdbarch
, insn
, dsc
);
6568 return arm_copy_unmodified (gdbarch
, insn
, "mcr/mcr2", dsc
);
6570 return arm_copy_unmodified (gdbarch
, insn
, "cdp/cdp2", dsc
);
6574 return arm_copy_unmodified (gdbarch
, insn
, "mrc/mrc2", dsc
);
6576 return arm_copy_unmodified (gdbarch
, insn
, "cdp/cdp2", dsc
);
6579 return arm_copy_undef (gdbarch
, insn
, dsc
);
6583 /* Decode miscellaneous instructions in dp/misc encoding space. */
6586 arm_decode_miscellaneous (struct gdbarch
*gdbarch
, uint32_t insn
,
6587 struct regcache
*regs
,
6588 struct displaced_step_closure
*dsc
)
6590 unsigned int op2
= bits (insn
, 4, 6);
6591 unsigned int op
= bits (insn
, 21, 22);
6596 return arm_copy_unmodified (gdbarch
, insn
, "mrs/msr", dsc
);
6599 if (op
== 0x1) /* bx. */
6600 return arm_copy_bx_blx_reg (gdbarch
, insn
, regs
, dsc
);
6602 return arm_copy_unmodified (gdbarch
, insn
, "clz", dsc
);
6604 return arm_copy_undef (gdbarch
, insn
, dsc
);
6608 /* Not really supported. */
6609 return arm_copy_unmodified (gdbarch
, insn
, "bxj", dsc
);
6611 return arm_copy_undef (gdbarch
, insn
, dsc
);
6615 return arm_copy_bx_blx_reg (gdbarch
, insn
,
6616 regs
, dsc
); /* blx register. */
6618 return arm_copy_undef (gdbarch
, insn
, dsc
);
6621 return arm_copy_unmodified (gdbarch
, insn
, "saturating add/sub", dsc
);
6625 return arm_copy_unmodified (gdbarch
, insn
, "bkpt", dsc
);
6627 /* Not really supported. */
6628 return arm_copy_unmodified (gdbarch
, insn
, "smc", dsc
);
6631 return arm_copy_undef (gdbarch
, insn
, dsc
);
6636 arm_decode_dp_misc (struct gdbarch
*gdbarch
, uint32_t insn
,
6637 struct regcache
*regs
,
6638 struct displaced_step_closure
*dsc
)
6641 switch (bits (insn
, 20, 24))
6644 return arm_copy_unmodified (gdbarch
, insn
, "movw", dsc
);
6647 return arm_copy_unmodified (gdbarch
, insn
, "movt", dsc
);
6649 case 0x12: case 0x16:
6650 return arm_copy_unmodified (gdbarch
, insn
, "msr imm", dsc
);
6653 return arm_copy_alu_imm (gdbarch
, insn
, regs
, dsc
);
6657 uint32_t op1
= bits (insn
, 20, 24), op2
= bits (insn
, 4, 7);
6659 if ((op1
& 0x19) != 0x10 && (op2
& 0x1) == 0x0)
6660 return arm_copy_alu_reg (gdbarch
, insn
, regs
, dsc
);
6661 else if ((op1
& 0x19) != 0x10 && (op2
& 0x9) == 0x1)
6662 return arm_copy_alu_shifted_reg (gdbarch
, insn
, regs
, dsc
);
6663 else if ((op1
& 0x19) == 0x10 && (op2
& 0x8) == 0x0)
6664 return arm_decode_miscellaneous (gdbarch
, insn
, regs
, dsc
);
6665 else if ((op1
& 0x19) == 0x10 && (op2
& 0x9) == 0x8)
6666 return arm_copy_unmodified (gdbarch
, insn
, "halfword mul/mla", dsc
);
6667 else if ((op1
& 0x10) == 0x00 && op2
== 0x9)
6668 return arm_copy_unmodified (gdbarch
, insn
, "mul/mla", dsc
);
6669 else if ((op1
& 0x10) == 0x10 && op2
== 0x9)
6670 return arm_copy_unmodified (gdbarch
, insn
, "synch", dsc
);
6671 else if (op2
== 0xb || (op2
& 0xd) == 0xd)
6672 /* 2nd arg means "unprivileged". */
6673 return arm_copy_extra_ld_st (gdbarch
, insn
, (op1
& 0x12) == 0x02, regs
,
6677 /* Should be unreachable. */
6682 arm_decode_ld_st_word_ubyte (struct gdbarch
*gdbarch
, uint32_t insn
,
6683 struct regcache
*regs
,
6684 struct displaced_step_closure
*dsc
)
6686 int a
= bit (insn
, 25), b
= bit (insn
, 4);
6687 uint32_t op1
= bits (insn
, 20, 24);
6689 if ((!a
&& (op1
& 0x05) == 0x00 && (op1
& 0x17) != 0x02)
6690 || (a
&& (op1
& 0x05) == 0x00 && (op1
& 0x17) != 0x02 && !b
))
6691 return arm_copy_ldr_str_ldrb_strb (gdbarch
, insn
, regs
, dsc
, 0, 4, 0);
6692 else if ((!a
&& (op1
& 0x17) == 0x02)
6693 || (a
&& (op1
& 0x17) == 0x02 && !b
))
6694 return arm_copy_ldr_str_ldrb_strb (gdbarch
, insn
, regs
, dsc
, 0, 4, 1);
6695 else if ((!a
&& (op1
& 0x05) == 0x01 && (op1
& 0x17) != 0x03)
6696 || (a
&& (op1
& 0x05) == 0x01 && (op1
& 0x17) != 0x03 && !b
))
6697 return arm_copy_ldr_str_ldrb_strb (gdbarch
, insn
, regs
, dsc
, 1, 4, 0);
6698 else if ((!a
&& (op1
& 0x17) == 0x03)
6699 || (a
&& (op1
& 0x17) == 0x03 && !b
))
6700 return arm_copy_ldr_str_ldrb_strb (gdbarch
, insn
, regs
, dsc
, 1, 4, 1);
6701 else if ((!a
&& (op1
& 0x05) == 0x04 && (op1
& 0x17) != 0x06)
6702 || (a
&& (op1
& 0x05) == 0x04 && (op1
& 0x17) != 0x06 && !b
))
6703 return arm_copy_ldr_str_ldrb_strb (gdbarch
, insn
, regs
, dsc
, 0, 1, 0);
6704 else if ((!a
&& (op1
& 0x17) == 0x06)
6705 || (a
&& (op1
& 0x17) == 0x06 && !b
))
6706 return arm_copy_ldr_str_ldrb_strb (gdbarch
, insn
, regs
, dsc
, 0, 1, 1);
6707 else if ((!a
&& (op1
& 0x05) == 0x05 && (op1
& 0x17) != 0x07)
6708 || (a
&& (op1
& 0x05) == 0x05 && (op1
& 0x17) != 0x07 && !b
))
6709 return arm_copy_ldr_str_ldrb_strb (gdbarch
, insn
, regs
, dsc
, 1, 1, 0);
6710 else if ((!a
&& (op1
& 0x17) == 0x07)
6711 || (a
&& (op1
& 0x17) == 0x07 && !b
))
6712 return arm_copy_ldr_str_ldrb_strb (gdbarch
, insn
, regs
, dsc
, 1, 1, 1);
6714 /* Should be unreachable. */
6719 arm_decode_media (struct gdbarch
*gdbarch
, uint32_t insn
,
6720 struct displaced_step_closure
*dsc
)
6722 switch (bits (insn
, 20, 24))
6724 case 0x00: case 0x01: case 0x02: case 0x03:
6725 return arm_copy_unmodified (gdbarch
, insn
, "parallel add/sub signed", dsc
);
6727 case 0x04: case 0x05: case 0x06: case 0x07:
6728 return arm_copy_unmodified (gdbarch
, insn
, "parallel add/sub unsigned", dsc
);
6730 case 0x08: case 0x09: case 0x0a: case 0x0b:
6731 case 0x0c: case 0x0d: case 0x0e: case 0x0f:
6732 return arm_copy_unmodified (gdbarch
, insn
,
6733 "decode/pack/unpack/saturate/reverse", dsc
);
6736 if (bits (insn
, 5, 7) == 0) /* op2. */
6738 if (bits (insn
, 12, 15) == 0xf)
6739 return arm_copy_unmodified (gdbarch
, insn
, "usad8", dsc
);
6741 return arm_copy_unmodified (gdbarch
, insn
, "usada8", dsc
);
6744 return arm_copy_undef (gdbarch
, insn
, dsc
);
6746 case 0x1a: case 0x1b:
6747 if (bits (insn
, 5, 6) == 0x2) /* op2[1:0]. */
6748 return arm_copy_unmodified (gdbarch
, insn
, "sbfx", dsc
);
6750 return arm_copy_undef (gdbarch
, insn
, dsc
);
6752 case 0x1c: case 0x1d:
6753 if (bits (insn
, 5, 6) == 0x0) /* op2[1:0]. */
6755 if (bits (insn
, 0, 3) == 0xf)
6756 return arm_copy_unmodified (gdbarch
, insn
, "bfc", dsc
);
6758 return arm_copy_unmodified (gdbarch
, insn
, "bfi", dsc
);
6761 return arm_copy_undef (gdbarch
, insn
, dsc
);
6763 case 0x1e: case 0x1f:
6764 if (bits (insn
, 5, 6) == 0x2) /* op2[1:0]. */
6765 return arm_copy_unmodified (gdbarch
, insn
, "ubfx", dsc
);
6767 return arm_copy_undef (gdbarch
, insn
, dsc
);
6770 /* Should be unreachable. */
6775 arm_decode_b_bl_ldmstm (struct gdbarch
*gdbarch
, uint32_t insn
,
6776 struct regcache
*regs
,
6777 struct displaced_step_closure
*dsc
)
6780 return arm_copy_b_bl_blx (gdbarch
, insn
, regs
, dsc
);
6782 return arm_copy_block_xfer (gdbarch
, insn
, regs
, dsc
);
6786 arm_decode_ext_reg_ld_st (struct gdbarch
*gdbarch
, uint32_t insn
,
6787 struct regcache
*regs
,
6788 struct displaced_step_closure
*dsc
)
6790 unsigned int opcode
= bits (insn
, 20, 24);
6794 case 0x04: case 0x05: /* VFP/Neon mrrc/mcrr. */
6795 return arm_copy_unmodified (gdbarch
, insn
, "vfp/neon mrrc/mcrr", dsc
);
6797 case 0x08: case 0x0a: case 0x0c: case 0x0e:
6798 case 0x12: case 0x16:
6799 return arm_copy_unmodified (gdbarch
, insn
, "vfp/neon vstm/vpush", dsc
);
6801 case 0x09: case 0x0b: case 0x0d: case 0x0f:
6802 case 0x13: case 0x17:
6803 return arm_copy_unmodified (gdbarch
, insn
, "vfp/neon vldm/vpop", dsc
);
6805 case 0x10: case 0x14: case 0x18: case 0x1c: /* vstr. */
6806 case 0x11: case 0x15: case 0x19: case 0x1d: /* vldr. */
6807 /* Note: no writeback for these instructions. Bit 25 will always be
6808 zero though (via caller), so the following works OK. */
6809 return arm_copy_copro_load_store (gdbarch
, insn
, regs
, dsc
);
6812 /* Should be unreachable. */
6816 /* Decode shifted register instructions. */
6819 thumb2_decode_dp_shift_reg (struct gdbarch
*gdbarch
, uint16_t insn1
,
6820 uint16_t insn2
, struct regcache
*regs
,
6821 struct displaced_step_closure
*dsc
)
6823 /* PC is only allowed to be used in instruction MOV. */
6825 unsigned int op
= bits (insn1
, 5, 8);
6826 unsigned int rn
= bits (insn1
, 0, 3);
6828 if (op
== 0x2 && rn
== 0xf) /* MOV */
6829 return thumb2_copy_alu_imm (gdbarch
, insn1
, insn2
, regs
, dsc
);
6831 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
6832 "dp (shift reg)", dsc
);
6836 /* Decode extension register load/store. Exactly the same as
6837 arm_decode_ext_reg_ld_st. */
6840 thumb2_decode_ext_reg_ld_st (struct gdbarch
*gdbarch
, uint16_t insn1
,
6841 uint16_t insn2
, struct regcache
*regs
,
6842 struct displaced_step_closure
*dsc
)
6844 unsigned int opcode
= bits (insn1
, 4, 8);
6848 case 0x04: case 0x05:
6849 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
6850 "vfp/neon vmov", dsc
);
6852 case 0x08: case 0x0c: /* 01x00 */
6853 case 0x0a: case 0x0e: /* 01x10 */
6854 case 0x12: case 0x16: /* 10x10 */
6855 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
6856 "vfp/neon vstm/vpush", dsc
);
6858 case 0x09: case 0x0d: /* 01x01 */
6859 case 0x0b: case 0x0f: /* 01x11 */
6860 case 0x13: case 0x17: /* 10x11 */
6861 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
6862 "vfp/neon vldm/vpop", dsc
);
6864 case 0x10: case 0x14: case 0x18: case 0x1c: /* vstr. */
6865 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
6867 case 0x11: case 0x15: case 0x19: case 0x1d: /* vldr. */
6868 return thumb2_copy_copro_load_store (gdbarch
, insn1
, insn2
, regs
, dsc
);
6871 /* Should be unreachable. */
6876 arm_decode_svc_copro (struct gdbarch
*gdbarch
, uint32_t insn
,
6877 struct regcache
*regs
, struct displaced_step_closure
*dsc
)
6879 unsigned int op1
= bits (insn
, 20, 25);
6880 int op
= bit (insn
, 4);
6881 unsigned int coproc
= bits (insn
, 8, 11);
6883 if ((op1
& 0x20) == 0x00 && (op1
& 0x3a) != 0x00 && (coproc
& 0xe) == 0xa)
6884 return arm_decode_ext_reg_ld_st (gdbarch
, insn
, regs
, dsc
);
6885 else if ((op1
& 0x21) == 0x00 && (op1
& 0x3a) != 0x00
6886 && (coproc
& 0xe) != 0xa)
6888 return arm_copy_copro_load_store (gdbarch
, insn
, regs
, dsc
);
6889 else if ((op1
& 0x21) == 0x01 && (op1
& 0x3a) != 0x00
6890 && (coproc
& 0xe) != 0xa)
6891 /* ldc/ldc2 imm/lit. */
6892 return arm_copy_copro_load_store (gdbarch
, insn
, regs
, dsc
);
6893 else if ((op1
& 0x3e) == 0x00)
6894 return arm_copy_undef (gdbarch
, insn
, dsc
);
6895 else if ((op1
& 0x3e) == 0x04 && (coproc
& 0xe) == 0xa)
6896 return arm_copy_unmodified (gdbarch
, insn
, "neon 64bit xfer", dsc
);
6897 else if (op1
== 0x04 && (coproc
& 0xe) != 0xa)
6898 return arm_copy_unmodified (gdbarch
, insn
, "mcrr/mcrr2", dsc
);
6899 else if (op1
== 0x05 && (coproc
& 0xe) != 0xa)
6900 return arm_copy_unmodified (gdbarch
, insn
, "mrrc/mrrc2", dsc
);
6901 else if ((op1
& 0x30) == 0x20 && !op
)
6903 if ((coproc
& 0xe) == 0xa)
6904 return arm_copy_unmodified (gdbarch
, insn
, "vfp dataproc", dsc
);
6906 return arm_copy_unmodified (gdbarch
, insn
, "cdp/cdp2", dsc
);
6908 else if ((op1
& 0x30) == 0x20 && op
)
6909 return arm_copy_unmodified (gdbarch
, insn
, "neon 8/16/32 bit xfer", dsc
);
6910 else if ((op1
& 0x31) == 0x20 && op
&& (coproc
& 0xe) != 0xa)
6911 return arm_copy_unmodified (gdbarch
, insn
, "mcr/mcr2", dsc
);
6912 else if ((op1
& 0x31) == 0x21 && op
&& (coproc
& 0xe) != 0xa)
6913 return arm_copy_unmodified (gdbarch
, insn
, "mrc/mrc2", dsc
);
6914 else if ((op1
& 0x30) == 0x30)
6915 return arm_copy_svc (gdbarch
, insn
, regs
, dsc
);
6917 return arm_copy_undef (gdbarch
, insn
, dsc
); /* Possibly unreachable. */
6921 thumb2_decode_svc_copro (struct gdbarch
*gdbarch
, uint16_t insn1
,
6922 uint16_t insn2
, struct regcache
*regs
,
6923 struct displaced_step_closure
*dsc
)
6925 unsigned int coproc
= bits (insn2
, 8, 11);
6926 unsigned int bit_5_8
= bits (insn1
, 5, 8);
6927 unsigned int bit_9
= bit (insn1
, 9);
6928 unsigned int bit_4
= bit (insn1
, 4);
6933 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
6934 "neon 64bit xfer/mrrc/mrrc2/mcrr/mcrr2",
6936 else if (bit_5_8
== 0) /* UNDEFINED. */
6937 return thumb_32bit_copy_undef (gdbarch
, insn1
, insn2
, dsc
);
6940 /*coproc is 101x. SIMD/VFP, ext registers load/store. */
6941 if ((coproc
& 0xe) == 0xa)
6942 return thumb2_decode_ext_reg_ld_st (gdbarch
, insn1
, insn2
, regs
,
6944 else /* coproc is not 101x. */
6946 if (bit_4
== 0) /* STC/STC2. */
6947 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
6949 else /* LDC/LDC2 {literal, immeidate}. */
6950 return thumb2_copy_copro_load_store (gdbarch
, insn1
, insn2
,
6956 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
, "coproc", dsc
);
6962 install_pc_relative (struct gdbarch
*gdbarch
, struct regcache
*regs
,
6963 struct displaced_step_closure
*dsc
, int rd
)
6969 Preparation: Rd <- PC
6975 int val
= displaced_read_reg (regs
, dsc
, ARM_PC_REGNUM
);
6976 displaced_write_reg (regs
, dsc
, rd
, val
, CANNOT_WRITE_PC
);
6980 thumb_copy_pc_relative_16bit (struct gdbarch
*gdbarch
, struct regcache
*regs
,
6981 struct displaced_step_closure
*dsc
,
6982 int rd
, unsigned int imm
)
6985 /* Encoding T2: ADDS Rd, #imm */
6986 dsc
->modinsn
[0] = (0x3000 | (rd
<< 8) | imm
);
6988 install_pc_relative (gdbarch
, regs
, dsc
, rd
);
6994 thumb_decode_pc_relative_16bit (struct gdbarch
*gdbarch
, uint16_t insn
,
6995 struct regcache
*regs
,
6996 struct displaced_step_closure
*dsc
)
6998 unsigned int rd
= bits (insn
, 8, 10);
6999 unsigned int imm8
= bits (insn
, 0, 7);
7001 if (debug_displaced
)
7002 fprintf_unfiltered (gdb_stdlog
,
7003 "displaced: copying thumb adr r%d, #%d insn %.4x\n",
7006 return thumb_copy_pc_relative_16bit (gdbarch
, regs
, dsc
, rd
, imm8
);
7010 thumb_copy_pc_relative_32bit (struct gdbarch
*gdbarch
, uint16_t insn1
,
7011 uint16_t insn2
, struct regcache
*regs
,
7012 struct displaced_step_closure
*dsc
)
7014 unsigned int rd
= bits (insn2
, 8, 11);
7015 /* Since immediate has the same encoding in ADR ADD and SUB, so we simply
7016 extract raw immediate encoding rather than computing immediate. When
7017 generating ADD or SUB instruction, we can simply perform OR operation to
7018 set immediate into ADD. */
7019 unsigned int imm_3_8
= insn2
& 0x70ff;
7020 unsigned int imm_i
= insn1
& 0x0400; /* Clear all bits except bit 10. */
7022 if (debug_displaced
)
7023 fprintf_unfiltered (gdb_stdlog
,
7024 "displaced: copying thumb adr r%d, #%d:%d insn %.4x%.4x\n",
7025 rd
, imm_i
, imm_3_8
, insn1
, insn2
);
7027 if (bit (insn1
, 7)) /* Encoding T2 */
7029 /* Encoding T3: SUB Rd, Rd, #imm */
7030 dsc
->modinsn
[0] = (0xf1a0 | rd
| imm_i
);
7031 dsc
->modinsn
[1] = ((rd
<< 8) | imm_3_8
);
7033 else /* Encoding T3 */
7035 /* Encoding T3: ADD Rd, Rd, #imm */
7036 dsc
->modinsn
[0] = (0xf100 | rd
| imm_i
);
7037 dsc
->modinsn
[1] = ((rd
<< 8) | imm_3_8
);
7041 install_pc_relative (gdbarch
, regs
, dsc
, rd
);
7047 thumb_copy_16bit_ldr_literal (struct gdbarch
*gdbarch
, uint16_t insn1
,
7048 struct regcache
*regs
,
7049 struct displaced_step_closure
*dsc
)
7051 unsigned int rt
= bits (insn1
, 8, 10);
7053 int imm8
= (bits (insn1
, 0, 7) << 2);
7059 Preparation: tmp0 <- R0, tmp2 <- R2, tmp3 <- R3, R2 <- PC, R3 <- #imm8;
7061 Insn: LDR R0, [R2, R3];
7062 Cleanup: R2 <- tmp2, R3 <- tmp3, Rd <- R0, R0 <- tmp0 */
7064 if (debug_displaced
)
7065 fprintf_unfiltered (gdb_stdlog
,
7066 "displaced: copying thumb ldr r%d [pc #%d]\n"
7069 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
7070 dsc
->tmp
[2] = displaced_read_reg (regs
, dsc
, 2);
7071 dsc
->tmp
[3] = displaced_read_reg (regs
, dsc
, 3);
7072 pc
= displaced_read_reg (regs
, dsc
, ARM_PC_REGNUM
);
7073 /* The assembler calculates the required value of the offset from the
7074 Align(PC,4) value of this instruction to the label. */
7075 pc
= pc
& 0xfffffffc;
7077 displaced_write_reg (regs
, dsc
, 2, pc
, CANNOT_WRITE_PC
);
7078 displaced_write_reg (regs
, dsc
, 3, imm8
, CANNOT_WRITE_PC
);
7081 dsc
->u
.ldst
.xfersize
= 4;
7083 dsc
->u
.ldst
.immed
= 0;
7084 dsc
->u
.ldst
.writeback
= 0;
7085 dsc
->u
.ldst
.restore_r4
= 0;
7087 dsc
->modinsn
[0] = 0x58d0; /* ldr r0, [r2, r3]*/
7089 dsc
->cleanup
= &cleanup_load
;
7094 /* Copy Thumb cbnz/cbz insruction. */
7097 thumb_copy_cbnz_cbz (struct gdbarch
*gdbarch
, uint16_t insn1
,
7098 struct regcache
*regs
,
7099 struct displaced_step_closure
*dsc
)
7101 int non_zero
= bit (insn1
, 11);
7102 unsigned int imm5
= (bit (insn1
, 9) << 6) | (bits (insn1
, 3, 7) << 1);
7103 CORE_ADDR from
= dsc
->insn_addr
;
7104 int rn
= bits (insn1
, 0, 2);
7105 int rn_val
= displaced_read_reg (regs
, dsc
, rn
);
7107 dsc
->u
.branch
.cond
= (rn_val
&& non_zero
) || (!rn_val
&& !non_zero
);
7108 /* CBNZ and CBZ do not affect the condition flags. If condition is true,
7109 set it INST_AL, so cleanup_branch will know branch is taken, otherwise,
7110 condition is false, let it be, cleanup_branch will do nothing. */
7111 if (dsc
->u
.branch
.cond
)
7113 dsc
->u
.branch
.cond
= INST_AL
;
7114 dsc
->u
.branch
.dest
= from
+ 4 + imm5
;
7117 dsc
->u
.branch
.dest
= from
+ 2;
7119 dsc
->u
.branch
.link
= 0;
7120 dsc
->u
.branch
.exchange
= 0;
7122 if (debug_displaced
)
7123 fprintf_unfiltered (gdb_stdlog
, "displaced: copying %s [r%d = 0x%x]"
7124 " insn %.4x to %.8lx\n", non_zero
? "cbnz" : "cbz",
7125 rn
, rn_val
, insn1
, dsc
->u
.branch
.dest
);
7127 dsc
->modinsn
[0] = THUMB_NOP
;
7129 dsc
->cleanup
= &cleanup_branch
;
7133 /* Copy Table Branch Byte/Halfword */
7135 thumb2_copy_table_branch (struct gdbarch
*gdbarch
, uint16_t insn1
,
7136 uint16_t insn2
, struct regcache
*regs
,
7137 struct displaced_step_closure
*dsc
)
7139 ULONGEST rn_val
, rm_val
;
7140 int is_tbh
= bit (insn2
, 4);
7141 CORE_ADDR halfwords
= 0;
7142 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
7144 rn_val
= displaced_read_reg (regs
, dsc
, bits (insn1
, 0, 3));
7145 rm_val
= displaced_read_reg (regs
, dsc
, bits (insn2
, 0, 3));
7151 target_read_memory (rn_val
+ 2 * rm_val
, buf
, 2);
7152 halfwords
= extract_unsigned_integer (buf
, 2, byte_order
);
7158 target_read_memory (rn_val
+ rm_val
, buf
, 1);
7159 halfwords
= extract_unsigned_integer (buf
, 1, byte_order
);
7162 if (debug_displaced
)
7163 fprintf_unfiltered (gdb_stdlog
, "displaced: %s base 0x%x offset 0x%x"
7164 " offset 0x%x\n", is_tbh
? "tbh" : "tbb",
7165 (unsigned int) rn_val
, (unsigned int) rm_val
,
7166 (unsigned int) halfwords
);
7168 dsc
->u
.branch
.cond
= INST_AL
;
7169 dsc
->u
.branch
.link
= 0;
7170 dsc
->u
.branch
.exchange
= 0;
7171 dsc
->u
.branch
.dest
= dsc
->insn_addr
+ 4 + 2 * halfwords
;
7173 dsc
->cleanup
= &cleanup_branch
;
7179 cleanup_pop_pc_16bit_all (struct gdbarch
*gdbarch
, struct regcache
*regs
,
7180 struct displaced_step_closure
*dsc
)
7183 int val
= displaced_read_reg (regs
, dsc
, 7);
7184 displaced_write_reg (regs
, dsc
, ARM_PC_REGNUM
, val
, BX_WRITE_PC
);
7187 val
= displaced_read_reg (regs
, dsc
, 8);
7188 displaced_write_reg (regs
, dsc
, 7, val
, CANNOT_WRITE_PC
);
7191 displaced_write_reg (regs
, dsc
, 8, dsc
->tmp
[0], CANNOT_WRITE_PC
);
7196 thumb_copy_pop_pc_16bit (struct gdbarch
*gdbarch
, uint16_t insn1
,
7197 struct regcache
*regs
,
7198 struct displaced_step_closure
*dsc
)
7200 dsc
->u
.block
.regmask
= insn1
& 0x00ff;
7202 /* Rewrite instruction: POP {rX, rY, ...,rZ, PC}
7205 (1) register list is full, that is, r0-r7 are used.
7206 Prepare: tmp[0] <- r8
7208 POP {r0, r1, ...., r6, r7}; remove PC from reglist
7209 MOV r8, r7; Move value of r7 to r8;
7210 POP {r7}; Store PC value into r7.
7212 Cleanup: PC <- r7, r7 <- r8, r8 <-tmp[0]
7214 (2) register list is not full, supposing there are N registers in
7215 register list (except PC, 0 <= N <= 7).
7216 Prepare: for each i, 0 - N, tmp[i] <- ri.
7218 POP {r0, r1, ...., rN};
7220 Cleanup: Set registers in original reglist from r0 - rN. Restore r0 - rN
7221 from tmp[] properly.
7223 if (debug_displaced
)
7224 fprintf_unfiltered (gdb_stdlog
,
7225 "displaced: copying thumb pop {%.8x, pc} insn %.4x\n",
7226 dsc
->u
.block
.regmask
, insn1
);
7228 if (dsc
->u
.block
.regmask
== 0xff)
7230 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 8);
7232 dsc
->modinsn
[0] = (insn1
& 0xfeff); /* POP {r0,r1,...,r6, r7} */
7233 dsc
->modinsn
[1] = 0x46b8; /* MOV r8, r7 */
7234 dsc
->modinsn
[2] = 0xbc80; /* POP {r7} */
7237 dsc
->cleanup
= &cleanup_pop_pc_16bit_all
;
7241 unsigned int num_in_list
= bitcount (dsc
->u
.block
.regmask
);
7243 unsigned int new_regmask
;
7245 for (i
= 0; i
< num_in_list
+ 1; i
++)
7246 dsc
->tmp
[i
] = displaced_read_reg (regs
, dsc
, i
);
7248 new_regmask
= (1 << (num_in_list
+ 1)) - 1;
7250 if (debug_displaced
)
7251 fprintf_unfiltered (gdb_stdlog
, _("displaced: POP "
7252 "{..., pc}: original reg list %.4x,"
7253 " modified list %.4x\n"),
7254 (int) dsc
->u
.block
.regmask
, new_regmask
);
7256 dsc
->u
.block
.regmask
|= 0x8000;
7257 dsc
->u
.block
.writeback
= 0;
7258 dsc
->u
.block
.cond
= INST_AL
;
7260 dsc
->modinsn
[0] = (insn1
& ~0x1ff) | (new_regmask
& 0xff);
7262 dsc
->cleanup
= &cleanup_block_load_pc
;
7269 thumb_process_displaced_16bit_insn (struct gdbarch
*gdbarch
, uint16_t insn1
,
7270 struct regcache
*regs
,
7271 struct displaced_step_closure
*dsc
)
7273 unsigned short op_bit_12_15
= bits (insn1
, 12, 15);
7274 unsigned short op_bit_10_11
= bits (insn1
, 10, 11);
7277 /* 16-bit thumb instructions. */
7278 switch (op_bit_12_15
)
7280 /* Shift (imme), add, subtract, move and compare. */
7281 case 0: case 1: case 2: case 3:
7282 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
,
7283 "shift/add/sub/mov/cmp",
7287 switch (op_bit_10_11
)
7289 case 0: /* Data-processing */
7290 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
,
7294 case 1: /* Special data instructions and branch and exchange. */
7296 unsigned short op
= bits (insn1
, 7, 9);
7297 if (op
== 6 || op
== 7) /* BX or BLX */
7298 err
= thumb_copy_bx_blx_reg (gdbarch
, insn1
, regs
, dsc
);
7299 else if (bits (insn1
, 6, 7) != 0) /* ADD/MOV/CMP high registers. */
7300 err
= thumb_copy_alu_reg (gdbarch
, insn1
, regs
, dsc
);
7302 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
, "special data",
7306 default: /* LDR (literal) */
7307 err
= thumb_copy_16bit_ldr_literal (gdbarch
, insn1
, regs
, dsc
);
7310 case 5: case 6: case 7: case 8: case 9: /* Load/Store single data item */
7311 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
, "ldr/str", dsc
);
7314 if (op_bit_10_11
< 2) /* Generate PC-relative address */
7315 err
= thumb_decode_pc_relative_16bit (gdbarch
, insn1
, regs
, dsc
);
7316 else /* Generate SP-relative address */
7317 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
, "sp-relative", dsc
);
7319 case 11: /* Misc 16-bit instructions */
7321 switch (bits (insn1
, 8, 11))
7323 case 1: case 3: case 9: case 11: /* CBNZ, CBZ */
7324 err
= thumb_copy_cbnz_cbz (gdbarch
, insn1
, regs
, dsc
);
7326 case 12: case 13: /* POP */
7327 if (bit (insn1
, 8)) /* PC is in register list. */
7328 err
= thumb_copy_pop_pc_16bit (gdbarch
, insn1
, regs
, dsc
);
7330 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
, "pop", dsc
);
7332 case 15: /* If-Then, and hints */
7333 if (bits (insn1
, 0, 3))
7334 /* If-Then makes up to four following instructions conditional.
7335 IT instruction itself is not conditional, so handle it as a
7336 common unmodified instruction. */
7337 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
, "If-Then",
7340 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
, "hints", dsc
);
7343 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
, "misc", dsc
);
7348 if (op_bit_10_11
< 2) /* Store multiple registers */
7349 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
, "stm", dsc
);
7350 else /* Load multiple registers */
7351 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
, "ldm", dsc
);
7353 case 13: /* Conditional branch and supervisor call */
7354 if (bits (insn1
, 9, 11) != 7) /* conditional branch */
7355 err
= thumb_copy_b (gdbarch
, insn1
, dsc
);
7357 err
= thumb_copy_svc (gdbarch
, insn1
, regs
, dsc
);
7359 case 14: /* Unconditional branch */
7360 err
= thumb_copy_b (gdbarch
, insn1
, dsc
);
7367 internal_error (__FILE__
, __LINE__
,
7368 _("thumb_process_displaced_16bit_insn: Instruction decode error"));
7372 decode_thumb_32bit_ld_mem_hints (struct gdbarch
*gdbarch
,
7373 uint16_t insn1
, uint16_t insn2
,
7374 struct regcache
*regs
,
7375 struct displaced_step_closure
*dsc
)
7377 int rt
= bits (insn2
, 12, 15);
7378 int rn
= bits (insn1
, 0, 3);
7379 int op1
= bits (insn1
, 7, 8);
7381 switch (bits (insn1
, 5, 6))
7383 case 0: /* Load byte and memory hints */
7384 if (rt
== 0xf) /* PLD/PLI */
7387 /* PLD literal or Encoding T3 of PLI(immediate, literal). */
7388 return thumb2_copy_preload (gdbarch
, insn1
, insn2
, regs
, dsc
);
7390 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7395 if (rn
== 0xf) /* LDRB/LDRSB (literal) */
7396 return thumb2_copy_load_literal (gdbarch
, insn1
, insn2
, regs
, dsc
,
7399 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7400 "ldrb{reg, immediate}/ldrbt",
7405 case 1: /* Load halfword and memory hints. */
7406 if (rt
== 0xf) /* PLD{W} and Unalloc memory hint. */
7407 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7408 "pld/unalloc memhint", dsc
);
7412 return thumb2_copy_load_literal (gdbarch
, insn1
, insn2
, regs
, dsc
,
7415 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7419 case 2: /* Load word */
7421 int insn2_bit_8_11
= bits (insn2
, 8, 11);
7424 return thumb2_copy_load_literal (gdbarch
, insn1
, insn2
, regs
, dsc
, 4);
7425 else if (op1
== 0x1) /* Encoding T3 */
7426 return thumb2_copy_load_reg_imm (gdbarch
, insn1
, insn2
, regs
, dsc
,
7428 else /* op1 == 0x0 */
7430 if (insn2_bit_8_11
== 0xc || (insn2_bit_8_11
& 0x9) == 0x9)
7431 /* LDR (immediate) */
7432 return thumb2_copy_load_reg_imm (gdbarch
, insn1
, insn2
, regs
,
7433 dsc
, bit (insn2
, 8), 1);
7434 else if (insn2_bit_8_11
== 0xe) /* LDRT */
7435 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7438 /* LDR (register) */
7439 return thumb2_copy_load_reg_imm (gdbarch
, insn1
, insn2
, regs
,
7445 return thumb_32bit_copy_undef (gdbarch
, insn1
, insn2
, dsc
);
7452 thumb_process_displaced_32bit_insn (struct gdbarch
*gdbarch
, uint16_t insn1
,
7453 uint16_t insn2
, struct regcache
*regs
,
7454 struct displaced_step_closure
*dsc
)
7457 unsigned short op
= bit (insn2
, 15);
7458 unsigned int op1
= bits (insn1
, 11, 12);
7464 switch (bits (insn1
, 9, 10))
7469 /* Load/store {dual, execlusive}, table branch. */
7470 if (bits (insn1
, 7, 8) == 1 && bits (insn1
, 4, 5) == 1
7471 && bits (insn2
, 5, 7) == 0)
7472 err
= thumb2_copy_table_branch (gdbarch
, insn1
, insn2
, regs
,
7475 /* PC is not allowed to use in load/store {dual, exclusive}
7477 err
= thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7478 "load/store dual/ex", dsc
);
7480 else /* load/store multiple */
7482 switch (bits (insn1
, 7, 8))
7484 case 0: case 3: /* SRS, RFE */
7485 err
= thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7488 case 1: case 2: /* LDM/STM/PUSH/POP */
7489 err
= thumb2_copy_block_xfer (gdbarch
, insn1
, insn2
, regs
, dsc
);
7496 /* Data-processing (shift register). */
7497 err
= thumb2_decode_dp_shift_reg (gdbarch
, insn1
, insn2
, regs
,
7500 default: /* Coprocessor instructions. */
7501 err
= thumb2_decode_svc_copro (gdbarch
, insn1
, insn2
, regs
, dsc
);
7506 case 2: /* op1 = 2 */
7507 if (op
) /* Branch and misc control. */
7509 if (bit (insn2
, 14) /* BLX/BL */
7510 || bit (insn2
, 12) /* Unconditional branch */
7511 || (bits (insn1
, 7, 9) != 0x7)) /* Conditional branch */
7512 err
= thumb2_copy_b_bl_blx (gdbarch
, insn1
, insn2
, regs
, dsc
);
7514 err
= thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7519 if (bit (insn1
, 9)) /* Data processing (plain binary imm). */
7521 int op
= bits (insn1
, 4, 8);
7522 int rn
= bits (insn1
, 0, 3);
7523 if ((op
== 0 || op
== 0xa) && rn
== 0xf)
7524 err
= thumb_copy_pc_relative_32bit (gdbarch
, insn1
, insn2
,
7527 err
= thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7530 else /* Data processing (modified immeidate) */
7531 err
= thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7535 case 3: /* op1 = 3 */
7536 switch (bits (insn1
, 9, 10))
7540 err
= decode_thumb_32bit_ld_mem_hints (gdbarch
, insn1
, insn2
,
7542 else /* NEON Load/Store and Store single data item */
7543 err
= thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7544 "neon elt/struct load/store",
7547 case 1: /* op1 = 3, bits (9, 10) == 1 */
7548 switch (bits (insn1
, 7, 8))
7550 case 0: case 1: /* Data processing (register) */
7551 err
= thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7554 case 2: /* Multiply and absolute difference */
7555 err
= thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7556 "mul/mua/diff", dsc
);
7558 case 3: /* Long multiply and divide */
7559 err
= thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7564 default: /* Coprocessor instructions */
7565 err
= thumb2_decode_svc_copro (gdbarch
, insn1
, insn2
, regs
, dsc
);
7574 internal_error (__FILE__
, __LINE__
,
7575 _("thumb_process_displaced_32bit_insn: Instruction decode error"));
7580 thumb_process_displaced_insn (struct gdbarch
*gdbarch
, CORE_ADDR from
,
7581 struct regcache
*regs
,
7582 struct displaced_step_closure
*dsc
)
7584 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
7586 = read_memory_unsigned_integer (from
, 2, byte_order_for_code
);
7588 if (debug_displaced
)
7589 fprintf_unfiltered (gdb_stdlog
, "displaced: process thumb insn %.4x "
7590 "at %.8lx\n", insn1
, (unsigned long) from
);
7593 dsc
->insn_size
= thumb_insn_size (insn1
);
7594 if (thumb_insn_size (insn1
) == 4)
7597 = read_memory_unsigned_integer (from
+ 2, 2, byte_order_for_code
);
7598 thumb_process_displaced_32bit_insn (gdbarch
, insn1
, insn2
, regs
, dsc
);
7601 thumb_process_displaced_16bit_insn (gdbarch
, insn1
, regs
, dsc
);
7605 arm_process_displaced_insn (struct gdbarch
*gdbarch
, CORE_ADDR from
,
7606 CORE_ADDR to
, struct regcache
*regs
,
7607 struct displaced_step_closure
*dsc
)
7610 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
7613 /* Most displaced instructions use a 1-instruction scratch space, so set this
7614 here and override below if/when necessary. */
7616 dsc
->insn_addr
= from
;
7617 dsc
->scratch_base
= to
;
7618 dsc
->cleanup
= NULL
;
7619 dsc
->wrote_to_pc
= 0;
7621 if (!displaced_in_arm_mode (regs
))
7622 return thumb_process_displaced_insn (gdbarch
, from
, regs
, dsc
);
7626 insn
= read_memory_unsigned_integer (from
, 4, byte_order_for_code
);
7627 if (debug_displaced
)
7628 fprintf_unfiltered (gdb_stdlog
, "displaced: stepping insn %.8lx "
7629 "at %.8lx\n", (unsigned long) insn
,
7630 (unsigned long) from
);
7632 if ((insn
& 0xf0000000) == 0xf0000000)
7633 err
= arm_decode_unconditional (gdbarch
, insn
, regs
, dsc
);
7634 else switch (((insn
& 0x10) >> 4) | ((insn
& 0xe000000) >> 24))
7636 case 0x0: case 0x1: case 0x2: case 0x3:
7637 err
= arm_decode_dp_misc (gdbarch
, insn
, regs
, dsc
);
7640 case 0x4: case 0x5: case 0x6:
7641 err
= arm_decode_ld_st_word_ubyte (gdbarch
, insn
, regs
, dsc
);
7645 err
= arm_decode_media (gdbarch
, insn
, dsc
);
7648 case 0x8: case 0x9: case 0xa: case 0xb:
7649 err
= arm_decode_b_bl_ldmstm (gdbarch
, insn
, regs
, dsc
);
7652 case 0xc: case 0xd: case 0xe: case 0xf:
7653 err
= arm_decode_svc_copro (gdbarch
, insn
, regs
, dsc
);
7658 internal_error (__FILE__
, __LINE__
,
7659 _("arm_process_displaced_insn: Instruction decode error"));
7662 /* Actually set up the scratch space for a displaced instruction. */
7665 arm_displaced_init_closure (struct gdbarch
*gdbarch
, CORE_ADDR from
,
7666 CORE_ADDR to
, struct displaced_step_closure
*dsc
)
7668 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
7669 unsigned int i
, len
, offset
;
7670 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
7671 int size
= dsc
->is_thumb
? 2 : 4;
7672 const gdb_byte
*bkp_insn
;
7675 /* Poke modified instruction(s). */
7676 for (i
= 0; i
< dsc
->numinsns
; i
++)
7678 if (debug_displaced
)
7680 fprintf_unfiltered (gdb_stdlog
, "displaced: writing insn ");
7682 fprintf_unfiltered (gdb_stdlog
, "%.8lx",
7685 fprintf_unfiltered (gdb_stdlog
, "%.4x",
7686 (unsigned short)dsc
->modinsn
[i
]);
7688 fprintf_unfiltered (gdb_stdlog
, " at %.8lx\n",
7689 (unsigned long) to
+ offset
);
7692 write_memory_unsigned_integer (to
+ offset
, size
,
7693 byte_order_for_code
,
7698 /* Choose the correct breakpoint instruction. */
7701 bkp_insn
= tdep
->thumb_breakpoint
;
7702 len
= tdep
->thumb_breakpoint_size
;
7706 bkp_insn
= tdep
->arm_breakpoint
;
7707 len
= tdep
->arm_breakpoint_size
;
7710 /* Put breakpoint afterwards. */
7711 write_memory (to
+ offset
, bkp_insn
, len
);
7713 if (debug_displaced
)
7714 fprintf_unfiltered (gdb_stdlog
, "displaced: copy %s->%s: ",
7715 paddress (gdbarch
, from
), paddress (gdbarch
, to
));
7718 /* Entry point for cleaning things up after a displaced instruction has been
7722 arm_displaced_step_fixup (struct gdbarch
*gdbarch
,
7723 struct displaced_step_closure
*dsc
,
7724 CORE_ADDR from
, CORE_ADDR to
,
7725 struct regcache
*regs
)
7728 dsc
->cleanup (gdbarch
, regs
, dsc
);
7730 if (!dsc
->wrote_to_pc
)
7731 regcache_cooked_write_unsigned (regs
, ARM_PC_REGNUM
,
7732 dsc
->insn_addr
+ dsc
->insn_size
);
7736 #include "bfd-in2.h"
7737 #include "libcoff.h"
7740 gdb_print_insn_arm (bfd_vma memaddr
, disassemble_info
*info
)
7742 struct gdbarch
*gdbarch
= (struct gdbarch
*) info
->application_data
;
7744 if (arm_pc_is_thumb (gdbarch
, memaddr
))
7746 static asymbol
*asym
;
7747 static combined_entry_type ce
;
7748 static struct coff_symbol_struct csym
;
7749 static struct bfd fake_bfd
;
7750 static bfd_target fake_target
;
7752 if (csym
.native
== NULL
)
7754 /* Create a fake symbol vector containing a Thumb symbol.
7755 This is solely so that the code in print_insn_little_arm()
7756 and print_insn_big_arm() in opcodes/arm-dis.c will detect
7757 the presence of a Thumb symbol and switch to decoding
7758 Thumb instructions. */
7760 fake_target
.flavour
= bfd_target_coff_flavour
;
7761 fake_bfd
.xvec
= &fake_target
;
7762 ce
.u
.syment
.n_sclass
= C_THUMBEXTFUNC
;
7764 csym
.symbol
.the_bfd
= &fake_bfd
;
7765 csym
.symbol
.name
= "fake";
7766 asym
= (asymbol
*) & csym
;
7769 memaddr
= UNMAKE_THUMB_ADDR (memaddr
);
7770 info
->symbols
= &asym
;
7773 info
->symbols
= NULL
;
7775 if (info
->endian
== BFD_ENDIAN_BIG
)
7776 return print_insn_big_arm (memaddr
, info
);
7778 return print_insn_little_arm (memaddr
, info
);
7781 /* The following define instruction sequences that will cause ARM
7782 cpu's to take an undefined instruction trap. These are used to
7783 signal a breakpoint to GDB.
7785 The newer ARMv4T cpu's are capable of operating in ARM or Thumb
7786 modes. A different instruction is required for each mode. The ARM
7787 cpu's can also be big or little endian. Thus four different
7788 instructions are needed to support all cases.
7790 Note: ARMv4 defines several new instructions that will take the
7791 undefined instruction trap. ARM7TDMI is nominally ARMv4T, but does
7792 not in fact add the new instructions. The new undefined
7793 instructions in ARMv4 are all instructions that had no defined
7794 behaviour in earlier chips. There is no guarantee that they will
7795 raise an exception, but may be treated as NOP's. In practice, it
7796 may only safe to rely on instructions matching:
7798 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
7799 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
7800 C C C C 0 1 1 x x x x x x x x x x x x x x x x x x x x 1 x x x x
7802 Even this may only true if the condition predicate is true. The
7803 following use a condition predicate of ALWAYS so it is always TRUE.
7805 There are other ways of forcing a breakpoint. GNU/Linux, RISC iX,
7806 and NetBSD all use a software interrupt rather than an undefined
7807 instruction to force a trap. This can be handled by by the
7808 abi-specific code during establishment of the gdbarch vector. */
7810 #define ARM_LE_BREAKPOINT {0xFE,0xDE,0xFF,0xE7}
7811 #define ARM_BE_BREAKPOINT {0xE7,0xFF,0xDE,0xFE}
7812 #define THUMB_LE_BREAKPOINT {0xbe,0xbe}
7813 #define THUMB_BE_BREAKPOINT {0xbe,0xbe}
7815 static const gdb_byte arm_default_arm_le_breakpoint
[] = ARM_LE_BREAKPOINT
;
7816 static const gdb_byte arm_default_arm_be_breakpoint
[] = ARM_BE_BREAKPOINT
;
7817 static const gdb_byte arm_default_thumb_le_breakpoint
[] = THUMB_LE_BREAKPOINT
;
7818 static const gdb_byte arm_default_thumb_be_breakpoint
[] = THUMB_BE_BREAKPOINT
;
7820 /* Implement the breakpoint_kind_from_pc gdbarch method. */
7823 arm_breakpoint_kind_from_pc (struct gdbarch
*gdbarch
, CORE_ADDR
*pcptr
)
7825 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
7826 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
7828 if (arm_pc_is_thumb (gdbarch
, *pcptr
))
7830 *pcptr
= UNMAKE_THUMB_ADDR (*pcptr
);
7832 /* If we have a separate 32-bit breakpoint instruction for Thumb-2,
7833 check whether we are replacing a 32-bit instruction. */
7834 if (tdep
->thumb2_breakpoint
!= NULL
)
7838 if (target_read_memory (*pcptr
, buf
, 2) == 0)
7840 unsigned short inst1
;
7842 inst1
= extract_unsigned_integer (buf
, 2, byte_order_for_code
);
7843 if (thumb_insn_size (inst1
) == 4)
7844 return ARM_BP_KIND_THUMB2
;
7848 return ARM_BP_KIND_THUMB
;
7851 return ARM_BP_KIND_ARM
;
7855 /* Implement the sw_breakpoint_from_kind gdbarch method. */
7857 static const gdb_byte
*
7858 arm_sw_breakpoint_from_kind (struct gdbarch
*gdbarch
, int kind
, int *size
)
7860 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
7864 case ARM_BP_KIND_ARM
:
7865 *size
= tdep
->arm_breakpoint_size
;
7866 return tdep
->arm_breakpoint
;
7867 case ARM_BP_KIND_THUMB
:
7868 *size
= tdep
->thumb_breakpoint_size
;
7869 return tdep
->thumb_breakpoint
;
7870 case ARM_BP_KIND_THUMB2
:
7871 *size
= tdep
->thumb2_breakpoint_size
;
7872 return tdep
->thumb2_breakpoint
;
7874 gdb_assert_not_reached ("unexpected arm breakpoint kind");
7878 /* Implement the breakpoint_kind_from_current_state gdbarch method. */
7881 arm_breakpoint_kind_from_current_state (struct gdbarch
*gdbarch
,
7882 struct regcache
*regcache
,
7887 /* Check the memory pointed by PC is readable. */
7888 if (target_read_memory (regcache_read_pc (regcache
), buf
, 4) == 0)
7890 struct arm_get_next_pcs next_pcs_ctx
;
7893 VEC (CORE_ADDR
) *next_pcs
= NULL
;
7894 struct cleanup
*old_chain
7895 = make_cleanup (VEC_cleanup (CORE_ADDR
), &next_pcs
);
7897 arm_get_next_pcs_ctor (&next_pcs_ctx
,
7898 &arm_get_next_pcs_ops
,
7899 gdbarch_byte_order (gdbarch
),
7900 gdbarch_byte_order_for_code (gdbarch
),
7904 next_pcs
= arm_get_next_pcs (&next_pcs_ctx
);
7906 /* If MEMADDR is the next instruction of current pc, do the
7907 software single step computation, and get the thumb mode by
7908 the destination address. */
7909 for (i
= 0; VEC_iterate (CORE_ADDR
, next_pcs
, i
, pc
); i
++)
7911 if (UNMAKE_THUMB_ADDR (pc
) == *pcptr
)
7913 do_cleanups (old_chain
);
7915 if (IS_THUMB_ADDR (pc
))
7917 *pcptr
= MAKE_THUMB_ADDR (*pcptr
);
7918 return arm_breakpoint_kind_from_pc (gdbarch
, pcptr
);
7921 return ARM_BP_KIND_ARM
;
7925 do_cleanups (old_chain
);
7928 return arm_breakpoint_kind_from_pc (gdbarch
, pcptr
);
7931 /* Extract from an array REGBUF containing the (raw) register state a
7932 function return value of type TYPE, and copy that, in virtual
7933 format, into VALBUF. */
7936 arm_extract_return_value (struct type
*type
, struct regcache
*regs
,
7939 struct gdbarch
*gdbarch
= get_regcache_arch (regs
);
7940 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
7942 if (TYPE_CODE_FLT
== TYPE_CODE (type
))
7944 switch (gdbarch_tdep (gdbarch
)->fp_model
)
7948 /* The value is in register F0 in internal format. We need to
7949 extract the raw value and then convert it to the desired
7951 bfd_byte tmpbuf
[FP_REGISTER_SIZE
];
7953 regcache_cooked_read (regs
, ARM_F0_REGNUM
, tmpbuf
);
7954 convert_from_extended (floatformat_from_type (type
), tmpbuf
,
7955 valbuf
, gdbarch_byte_order (gdbarch
));
7959 case ARM_FLOAT_SOFT_FPA
:
7960 case ARM_FLOAT_SOFT_VFP
:
7961 /* ARM_FLOAT_VFP can arise if this is a variadic function so
7962 not using the VFP ABI code. */
7964 regcache_cooked_read (regs
, ARM_A1_REGNUM
, valbuf
);
7965 if (TYPE_LENGTH (type
) > 4)
7966 regcache_cooked_read (regs
, ARM_A1_REGNUM
+ 1,
7967 valbuf
+ INT_REGISTER_SIZE
);
7971 internal_error (__FILE__
, __LINE__
,
7972 _("arm_extract_return_value: "
7973 "Floating point model not supported"));
7977 else if (TYPE_CODE (type
) == TYPE_CODE_INT
7978 || TYPE_CODE (type
) == TYPE_CODE_CHAR
7979 || TYPE_CODE (type
) == TYPE_CODE_BOOL
7980 || TYPE_CODE (type
) == TYPE_CODE_PTR
7981 || TYPE_CODE (type
) == TYPE_CODE_REF
7982 || TYPE_CODE (type
) == TYPE_CODE_ENUM
)
7984 /* If the type is a plain integer, then the access is
7985 straight-forward. Otherwise we have to play around a bit
7987 int len
= TYPE_LENGTH (type
);
7988 int regno
= ARM_A1_REGNUM
;
7993 /* By using store_unsigned_integer we avoid having to do
7994 anything special for small big-endian values. */
7995 regcache_cooked_read_unsigned (regs
, regno
++, &tmp
);
7996 store_unsigned_integer (valbuf
,
7997 (len
> INT_REGISTER_SIZE
7998 ? INT_REGISTER_SIZE
: len
),
8000 len
-= INT_REGISTER_SIZE
;
8001 valbuf
+= INT_REGISTER_SIZE
;
8006 /* For a structure or union the behaviour is as if the value had
8007 been stored to word-aligned memory and then loaded into
8008 registers with 32-bit load instruction(s). */
8009 int len
= TYPE_LENGTH (type
);
8010 int regno
= ARM_A1_REGNUM
;
8011 bfd_byte tmpbuf
[INT_REGISTER_SIZE
];
8015 regcache_cooked_read (regs
, regno
++, tmpbuf
);
8016 memcpy (valbuf
, tmpbuf
,
8017 len
> INT_REGISTER_SIZE
? INT_REGISTER_SIZE
: len
);
8018 len
-= INT_REGISTER_SIZE
;
8019 valbuf
+= INT_REGISTER_SIZE
;
8025 /* Will a function return an aggregate type in memory or in a
8026 register? Return 0 if an aggregate type can be returned in a
8027 register, 1 if it must be returned in memory. */
8030 arm_return_in_memory (struct gdbarch
*gdbarch
, struct type
*type
)
8032 enum type_code code
;
8034 type
= check_typedef (type
);
8036 /* Simple, non-aggregate types (ie not including vectors and
8037 complex) are always returned in a register (or registers). */
8038 code
= TYPE_CODE (type
);
8039 if (TYPE_CODE_STRUCT
!= code
&& TYPE_CODE_UNION
!= code
8040 && TYPE_CODE_ARRAY
!= code
&& TYPE_CODE_COMPLEX
!= code
)
8043 if (TYPE_CODE_ARRAY
== code
&& TYPE_VECTOR (type
))
8045 /* Vector values should be returned using ARM registers if they
8046 are not over 16 bytes. */
8047 return (TYPE_LENGTH (type
) > 16);
8050 if (gdbarch_tdep (gdbarch
)->arm_abi
!= ARM_ABI_APCS
)
8052 /* The AAPCS says all aggregates not larger than a word are returned
8054 if (TYPE_LENGTH (type
) <= INT_REGISTER_SIZE
)
8063 /* All aggregate types that won't fit in a register must be returned
8065 if (TYPE_LENGTH (type
) > INT_REGISTER_SIZE
)
8068 /* In the ARM ABI, "integer" like aggregate types are returned in
8069 registers. For an aggregate type to be integer like, its size
8070 must be less than or equal to INT_REGISTER_SIZE and the
8071 offset of each addressable subfield must be zero. Note that bit
8072 fields are not addressable, and all addressable subfields of
8073 unions always start at offset zero.
8075 This function is based on the behaviour of GCC 2.95.1.
8076 See: gcc/arm.c: arm_return_in_memory() for details.
8078 Note: All versions of GCC before GCC 2.95.2 do not set up the
8079 parameters correctly for a function returning the following
8080 structure: struct { float f;}; This should be returned in memory,
8081 not a register. Richard Earnshaw sent me a patch, but I do not
8082 know of any way to detect if a function like the above has been
8083 compiled with the correct calling convention. */
8085 /* Assume all other aggregate types can be returned in a register.
8086 Run a check for structures, unions and arrays. */
8089 if ((TYPE_CODE_STRUCT
== code
) || (TYPE_CODE_UNION
== code
))
8092 /* Need to check if this struct/union is "integer" like. For
8093 this to be true, its size must be less than or equal to
8094 INT_REGISTER_SIZE and the offset of each addressable
8095 subfield must be zero. Note that bit fields are not
8096 addressable, and unions always start at offset zero. If any
8097 of the subfields is a floating point type, the struct/union
8098 cannot be an integer type. */
8100 /* For each field in the object, check:
8101 1) Is it FP? --> yes, nRc = 1;
8102 2) Is it addressable (bitpos != 0) and
8103 not packed (bitsize == 0)?
8107 for (i
= 0; i
< TYPE_NFIELDS (type
); i
++)
8109 enum type_code field_type_code
;
8112 = TYPE_CODE (check_typedef (TYPE_FIELD_TYPE (type
,
8115 /* Is it a floating point type field? */
8116 if (field_type_code
== TYPE_CODE_FLT
)
8122 /* If bitpos != 0, then we have to care about it. */
8123 if (TYPE_FIELD_BITPOS (type
, i
) != 0)
8125 /* Bitfields are not addressable. If the field bitsize is
8126 zero, then the field is not packed. Hence it cannot be
8127 a bitfield or any other packed type. */
8128 if (TYPE_FIELD_BITSIZE (type
, i
) == 0)
8141 /* Write into appropriate registers a function return value of type
8142 TYPE, given in virtual format. */
8145 arm_store_return_value (struct type
*type
, struct regcache
*regs
,
8146 const gdb_byte
*valbuf
)
8148 struct gdbarch
*gdbarch
= get_regcache_arch (regs
);
8149 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
8151 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
8153 gdb_byte buf
[MAX_REGISTER_SIZE
];
8155 switch (gdbarch_tdep (gdbarch
)->fp_model
)
8159 convert_to_extended (floatformat_from_type (type
), buf
, valbuf
,
8160 gdbarch_byte_order (gdbarch
));
8161 regcache_cooked_write (regs
, ARM_F0_REGNUM
, buf
);
8164 case ARM_FLOAT_SOFT_FPA
:
8165 case ARM_FLOAT_SOFT_VFP
:
8166 /* ARM_FLOAT_VFP can arise if this is a variadic function so
8167 not using the VFP ABI code. */
8169 regcache_cooked_write (regs
, ARM_A1_REGNUM
, valbuf
);
8170 if (TYPE_LENGTH (type
) > 4)
8171 regcache_cooked_write (regs
, ARM_A1_REGNUM
+ 1,
8172 valbuf
+ INT_REGISTER_SIZE
);
8176 internal_error (__FILE__
, __LINE__
,
8177 _("arm_store_return_value: Floating "
8178 "point model not supported"));
8182 else if (TYPE_CODE (type
) == TYPE_CODE_INT
8183 || TYPE_CODE (type
) == TYPE_CODE_CHAR
8184 || TYPE_CODE (type
) == TYPE_CODE_BOOL
8185 || TYPE_CODE (type
) == TYPE_CODE_PTR
8186 || TYPE_CODE (type
) == TYPE_CODE_REF
8187 || TYPE_CODE (type
) == TYPE_CODE_ENUM
)
8189 if (TYPE_LENGTH (type
) <= 4)
8191 /* Values of one word or less are zero/sign-extended and
8193 bfd_byte tmpbuf
[INT_REGISTER_SIZE
];
8194 LONGEST val
= unpack_long (type
, valbuf
);
8196 store_signed_integer (tmpbuf
, INT_REGISTER_SIZE
, byte_order
, val
);
8197 regcache_cooked_write (regs
, ARM_A1_REGNUM
, tmpbuf
);
8201 /* Integral values greater than one word are stored in consecutive
8202 registers starting with r0. This will always be a multiple of
8203 the regiser size. */
8204 int len
= TYPE_LENGTH (type
);
8205 int regno
= ARM_A1_REGNUM
;
8209 regcache_cooked_write (regs
, regno
++, valbuf
);
8210 len
-= INT_REGISTER_SIZE
;
8211 valbuf
+= INT_REGISTER_SIZE
;
8217 /* For a structure or union the behaviour is as if the value had
8218 been stored to word-aligned memory and then loaded into
8219 registers with 32-bit load instruction(s). */
8220 int len
= TYPE_LENGTH (type
);
8221 int regno
= ARM_A1_REGNUM
;
8222 bfd_byte tmpbuf
[INT_REGISTER_SIZE
];
8226 memcpy (tmpbuf
, valbuf
,
8227 len
> INT_REGISTER_SIZE
? INT_REGISTER_SIZE
: len
);
8228 regcache_cooked_write (regs
, regno
++, tmpbuf
);
8229 len
-= INT_REGISTER_SIZE
;
8230 valbuf
+= INT_REGISTER_SIZE
;
8236 /* Handle function return values. */
8238 static enum return_value_convention
8239 arm_return_value (struct gdbarch
*gdbarch
, struct value
*function
,
8240 struct type
*valtype
, struct regcache
*regcache
,
8241 gdb_byte
*readbuf
, const gdb_byte
*writebuf
)
8243 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
8244 struct type
*func_type
= function
? value_type (function
) : NULL
;
8245 enum arm_vfp_cprc_base_type vfp_base_type
;
8248 if (arm_vfp_abi_for_function (gdbarch
, func_type
)
8249 && arm_vfp_call_candidate (valtype
, &vfp_base_type
, &vfp_base_count
))
8251 int reg_char
= arm_vfp_cprc_reg_char (vfp_base_type
);
8252 int unit_length
= arm_vfp_cprc_unit_length (vfp_base_type
);
8254 for (i
= 0; i
< vfp_base_count
; i
++)
8256 if (reg_char
== 'q')
8259 arm_neon_quad_write (gdbarch
, regcache
, i
,
8260 writebuf
+ i
* unit_length
);
8263 arm_neon_quad_read (gdbarch
, regcache
, i
,
8264 readbuf
+ i
* unit_length
);
8271 xsnprintf (name_buf
, sizeof (name_buf
), "%c%d", reg_char
, i
);
8272 regnum
= user_reg_map_name_to_regnum (gdbarch
, name_buf
,
8275 regcache_cooked_write (regcache
, regnum
,
8276 writebuf
+ i
* unit_length
);
8278 regcache_cooked_read (regcache
, regnum
,
8279 readbuf
+ i
* unit_length
);
8282 return RETURN_VALUE_REGISTER_CONVENTION
;
8285 if (TYPE_CODE (valtype
) == TYPE_CODE_STRUCT
8286 || TYPE_CODE (valtype
) == TYPE_CODE_UNION
8287 || TYPE_CODE (valtype
) == TYPE_CODE_ARRAY
)
8289 if (tdep
->struct_return
== pcc_struct_return
8290 || arm_return_in_memory (gdbarch
, valtype
))
8291 return RETURN_VALUE_STRUCT_CONVENTION
;
8293 else if (TYPE_CODE (valtype
) == TYPE_CODE_COMPLEX
)
8295 if (arm_return_in_memory (gdbarch
, valtype
))
8296 return RETURN_VALUE_STRUCT_CONVENTION
;
8300 arm_store_return_value (valtype
, regcache
, writebuf
);
8303 arm_extract_return_value (valtype
, regcache
, readbuf
);
8305 return RETURN_VALUE_REGISTER_CONVENTION
;
8310 arm_get_longjmp_target (struct frame_info
*frame
, CORE_ADDR
*pc
)
8312 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
8313 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
8314 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
8316 gdb_byte buf
[INT_REGISTER_SIZE
];
8318 jb_addr
= get_frame_register_unsigned (frame
, ARM_A1_REGNUM
);
8320 if (target_read_memory (jb_addr
+ tdep
->jb_pc
* tdep
->jb_elt_size
, buf
,
8324 *pc
= extract_unsigned_integer (buf
, INT_REGISTER_SIZE
, byte_order
);
8328 /* Recognize GCC and GNU ld's trampolines. If we are in a trampoline,
8329 return the target PC. Otherwise return 0. */
8332 arm_skip_stub (struct frame_info
*frame
, CORE_ADDR pc
)
8336 CORE_ADDR start_addr
;
8338 /* Find the starting address and name of the function containing the PC. */
8339 if (find_pc_partial_function (pc
, &name
, &start_addr
, NULL
) == 0)
8341 /* Trampoline 'bx reg' doesn't belong to any functions. Do the
8343 start_addr
= arm_skip_bx_reg (frame
, pc
);
8344 if (start_addr
!= 0)
8350 /* If PC is in a Thumb call or return stub, return the address of the
8351 target PC, which is in a register. The thunk functions are called
8352 _call_via_xx, where x is the register name. The possible names
8353 are r0-r9, sl, fp, ip, sp, and lr. ARM RealView has similar
8354 functions, named __ARM_call_via_r[0-7]. */
8355 if (startswith (name
, "_call_via_")
8356 || startswith (name
, "__ARM_call_via_"))
8358 /* Use the name suffix to determine which register contains the
8360 static char *table
[15] =
8361 {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
8362 "r8", "r9", "sl", "fp", "ip", "sp", "lr"
8365 int offset
= strlen (name
) - 2;
8367 for (regno
= 0; regno
<= 14; regno
++)
8368 if (strcmp (&name
[offset
], table
[regno
]) == 0)
8369 return get_frame_register_unsigned (frame
, regno
);
8372 /* GNU ld generates __foo_from_arm or __foo_from_thumb for
8373 non-interworking calls to foo. We could decode the stubs
8374 to find the target but it's easier to use the symbol table. */
8375 namelen
= strlen (name
);
8376 if (name
[0] == '_' && name
[1] == '_'
8377 && ((namelen
> 2 + strlen ("_from_thumb")
8378 && startswith (name
+ namelen
- strlen ("_from_thumb"), "_from_thumb"))
8379 || (namelen
> 2 + strlen ("_from_arm")
8380 && startswith (name
+ namelen
- strlen ("_from_arm"), "_from_arm"))))
8383 int target_len
= namelen
- 2;
8384 struct bound_minimal_symbol minsym
;
8385 struct objfile
*objfile
;
8386 struct obj_section
*sec
;
8388 if (name
[namelen
- 1] == 'b')
8389 target_len
-= strlen ("_from_thumb");
8391 target_len
-= strlen ("_from_arm");
8393 target_name
= (char *) alloca (target_len
+ 1);
8394 memcpy (target_name
, name
+ 2, target_len
);
8395 target_name
[target_len
] = '\0';
8397 sec
= find_pc_section (pc
);
8398 objfile
= (sec
== NULL
) ? NULL
: sec
->objfile
;
8399 minsym
= lookup_minimal_symbol (target_name
, NULL
, objfile
);
8400 if (minsym
.minsym
!= NULL
)
8401 return BMSYMBOL_VALUE_ADDRESS (minsym
);
8406 return 0; /* not a stub */
8410 set_arm_command (char *args
, int from_tty
)
8412 printf_unfiltered (_("\
8413 \"set arm\" must be followed by an apporpriate subcommand.\n"));
8414 help_list (setarmcmdlist
, "set arm ", all_commands
, gdb_stdout
);
8418 show_arm_command (char *args
, int from_tty
)
8420 cmd_show_list (showarmcmdlist
, from_tty
, "");
8424 arm_update_current_architecture (void)
8426 struct gdbarch_info info
;
8428 /* If the current architecture is not ARM, we have nothing to do. */
8429 if (gdbarch_bfd_arch_info (target_gdbarch ())->arch
!= bfd_arch_arm
)
8432 /* Update the architecture. */
8433 gdbarch_info_init (&info
);
8435 if (!gdbarch_update_p (info
))
8436 internal_error (__FILE__
, __LINE__
, _("could not update architecture"));
8440 set_fp_model_sfunc (char *args
, int from_tty
,
8441 struct cmd_list_element
*c
)
8445 for (fp_model
= ARM_FLOAT_AUTO
; fp_model
!= ARM_FLOAT_LAST
; fp_model
++)
8446 if (strcmp (current_fp_model
, fp_model_strings
[fp_model
]) == 0)
8448 arm_fp_model
= (enum arm_float_model
) fp_model
;
8452 if (fp_model
== ARM_FLOAT_LAST
)
8453 internal_error (__FILE__
, __LINE__
, _("Invalid fp model accepted: %s."),
8456 arm_update_current_architecture ();
8460 show_fp_model (struct ui_file
*file
, int from_tty
,
8461 struct cmd_list_element
*c
, const char *value
)
8463 struct gdbarch_tdep
*tdep
= gdbarch_tdep (target_gdbarch ());
8465 if (arm_fp_model
== ARM_FLOAT_AUTO
8466 && gdbarch_bfd_arch_info (target_gdbarch ())->arch
== bfd_arch_arm
)
8467 fprintf_filtered (file
, _("\
8468 The current ARM floating point model is \"auto\" (currently \"%s\").\n"),
8469 fp_model_strings
[tdep
->fp_model
]);
8471 fprintf_filtered (file
, _("\
8472 The current ARM floating point model is \"%s\".\n"),
8473 fp_model_strings
[arm_fp_model
]);
8477 arm_set_abi (char *args
, int from_tty
,
8478 struct cmd_list_element
*c
)
8482 for (arm_abi
= ARM_ABI_AUTO
; arm_abi
!= ARM_ABI_LAST
; arm_abi
++)
8483 if (strcmp (arm_abi_string
, arm_abi_strings
[arm_abi
]) == 0)
8485 arm_abi_global
= (enum arm_abi_kind
) arm_abi
;
8489 if (arm_abi
== ARM_ABI_LAST
)
8490 internal_error (__FILE__
, __LINE__
, _("Invalid ABI accepted: %s."),
8493 arm_update_current_architecture ();
8497 arm_show_abi (struct ui_file
*file
, int from_tty
,
8498 struct cmd_list_element
*c
, const char *value
)
8500 struct gdbarch_tdep
*tdep
= gdbarch_tdep (target_gdbarch ());
8502 if (arm_abi_global
== ARM_ABI_AUTO
8503 && gdbarch_bfd_arch_info (target_gdbarch ())->arch
== bfd_arch_arm
)
8504 fprintf_filtered (file
, _("\
8505 The current ARM ABI is \"auto\" (currently \"%s\").\n"),
8506 arm_abi_strings
[tdep
->arm_abi
]);
8508 fprintf_filtered (file
, _("The current ARM ABI is \"%s\".\n"),
8513 arm_show_fallback_mode (struct ui_file
*file
, int from_tty
,
8514 struct cmd_list_element
*c
, const char *value
)
8516 fprintf_filtered (file
,
8517 _("The current execution mode assumed "
8518 "(when symbols are unavailable) is \"%s\".\n"),
8519 arm_fallback_mode_string
);
8523 arm_show_force_mode (struct ui_file
*file
, int from_tty
,
8524 struct cmd_list_element
*c
, const char *value
)
8526 fprintf_filtered (file
,
8527 _("The current execution mode assumed "
8528 "(even when symbols are available) is \"%s\".\n"),
8529 arm_force_mode_string
);
8532 /* If the user changes the register disassembly style used for info
8533 register and other commands, we have to also switch the style used
8534 in opcodes for disassembly output. This function is run in the "set
8535 arm disassembly" command, and does that. */
8538 set_disassembly_style_sfunc (char *args
, int from_tty
,
8539 struct cmd_list_element
*c
)
8541 set_disassembly_style ();
8544 /* Return the ARM register name corresponding to register I. */
8546 arm_register_name (struct gdbarch
*gdbarch
, int i
)
8548 const int num_regs
= gdbarch_num_regs (gdbarch
);
8550 if (gdbarch_tdep (gdbarch
)->have_vfp_pseudos
8551 && i
>= num_regs
&& i
< num_regs
+ 32)
8553 static const char *const vfp_pseudo_names
[] = {
8554 "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
8555 "s8", "s9", "s10", "s11", "s12", "s13", "s14", "s15",
8556 "s16", "s17", "s18", "s19", "s20", "s21", "s22", "s23",
8557 "s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31",
8560 return vfp_pseudo_names
[i
- num_regs
];
8563 if (gdbarch_tdep (gdbarch
)->have_neon_pseudos
8564 && i
>= num_regs
+ 32 && i
< num_regs
+ 32 + 16)
8566 static const char *const neon_pseudo_names
[] = {
8567 "q0", "q1", "q2", "q3", "q4", "q5", "q6", "q7",
8568 "q8", "q9", "q10", "q11", "q12", "q13", "q14", "q15",
8571 return neon_pseudo_names
[i
- num_regs
- 32];
8574 if (i
>= ARRAY_SIZE (arm_register_names
))
8575 /* These registers are only supported on targets which supply
8576 an XML description. */
8579 return arm_register_names
[i
];
8583 set_disassembly_style (void)
8587 /* Find the style that the user wants. */
8588 for (current
= 0; current
< num_disassembly_options
; current
++)
8589 if (disassembly_style
== valid_disassembly_styles
[current
])
8591 gdb_assert (current
< num_disassembly_options
);
8593 /* Synchronize the disassembler. */
8594 set_arm_regname_option (current
);
8597 /* Test whether the coff symbol specific value corresponds to a Thumb
8601 coff_sym_is_thumb (int val
)
8603 return (val
== C_THUMBEXT
8604 || val
== C_THUMBSTAT
8605 || val
== C_THUMBEXTFUNC
8606 || val
== C_THUMBSTATFUNC
8607 || val
== C_THUMBLABEL
);
8610 /* arm_coff_make_msymbol_special()
8611 arm_elf_make_msymbol_special()
8613 These functions test whether the COFF or ELF symbol corresponds to
8614 an address in thumb code, and set a "special" bit in a minimal
8615 symbol to indicate that it does. */
8618 arm_elf_make_msymbol_special(asymbol
*sym
, struct minimal_symbol
*msym
)
8620 elf_symbol_type
*elfsym
= (elf_symbol_type
*) sym
;
8622 if (ARM_GET_SYM_BRANCH_TYPE (elfsym
->internal_elf_sym
.st_target_internal
)
8623 == ST_BRANCH_TO_THUMB
)
8624 MSYMBOL_SET_SPECIAL (msym
);
8628 arm_coff_make_msymbol_special(int val
, struct minimal_symbol
*msym
)
8630 if (coff_sym_is_thumb (val
))
8631 MSYMBOL_SET_SPECIAL (msym
);
8635 arm_objfile_data_free (struct objfile
*objfile
, void *arg
)
8637 struct arm_per_objfile
*data
= (struct arm_per_objfile
*) arg
;
8640 for (i
= 0; i
< objfile
->obfd
->section_count
; i
++)
8641 VEC_free (arm_mapping_symbol_s
, data
->section_maps
[i
]);
8645 arm_record_special_symbol (struct gdbarch
*gdbarch
, struct objfile
*objfile
,
8648 const char *name
= bfd_asymbol_name (sym
);
8649 struct arm_per_objfile
*data
;
8650 VEC(arm_mapping_symbol_s
) **map_p
;
8651 struct arm_mapping_symbol new_map_sym
;
8653 gdb_assert (name
[0] == '$');
8654 if (name
[1] != 'a' && name
[1] != 't' && name
[1] != 'd')
8657 data
= (struct arm_per_objfile
*) objfile_data (objfile
,
8658 arm_objfile_data_key
);
8661 data
= OBSTACK_ZALLOC (&objfile
->objfile_obstack
,
8662 struct arm_per_objfile
);
8663 set_objfile_data (objfile
, arm_objfile_data_key
, data
);
8664 data
->section_maps
= OBSTACK_CALLOC (&objfile
->objfile_obstack
,
8665 objfile
->obfd
->section_count
,
8666 VEC(arm_mapping_symbol_s
) *);
8668 map_p
= &data
->section_maps
[bfd_get_section (sym
)->index
];
8670 new_map_sym
.value
= sym
->value
;
8671 new_map_sym
.type
= name
[1];
8673 /* Assume that most mapping symbols appear in order of increasing
8674 value. If they were randomly distributed, it would be faster to
8675 always push here and then sort at first use. */
8676 if (!VEC_empty (arm_mapping_symbol_s
, *map_p
))
8678 struct arm_mapping_symbol
*prev_map_sym
;
8680 prev_map_sym
= VEC_last (arm_mapping_symbol_s
, *map_p
);
8681 if (prev_map_sym
->value
>= sym
->value
)
8684 idx
= VEC_lower_bound (arm_mapping_symbol_s
, *map_p
, &new_map_sym
,
8685 arm_compare_mapping_symbols
);
8686 VEC_safe_insert (arm_mapping_symbol_s
, *map_p
, idx
, &new_map_sym
);
8691 VEC_safe_push (arm_mapping_symbol_s
, *map_p
, &new_map_sym
);
8695 arm_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
8697 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
8698 regcache_cooked_write_unsigned (regcache
, ARM_PC_REGNUM
, pc
);
8700 /* If necessary, set the T bit. */
8703 ULONGEST val
, t_bit
;
8704 regcache_cooked_read_unsigned (regcache
, ARM_PS_REGNUM
, &val
);
8705 t_bit
= arm_psr_thumb_bit (gdbarch
);
8706 if (arm_pc_is_thumb (gdbarch
, pc
))
8707 regcache_cooked_write_unsigned (regcache
, ARM_PS_REGNUM
,
8710 regcache_cooked_write_unsigned (regcache
, ARM_PS_REGNUM
,
8715 /* Read the contents of a NEON quad register, by reading from two
8716 double registers. This is used to implement the quad pseudo
8717 registers, and for argument passing in case the quad registers are
8718 missing; vectors are passed in quad registers when using the VFP
8719 ABI, even if a NEON unit is not present. REGNUM is the index of
8720 the quad register, in [0, 15]. */
8722 static enum register_status
8723 arm_neon_quad_read (struct gdbarch
*gdbarch
, struct regcache
*regcache
,
8724 int regnum
, gdb_byte
*buf
)
8727 gdb_byte reg_buf
[8];
8728 int offset
, double_regnum
;
8729 enum register_status status
;
8731 xsnprintf (name_buf
, sizeof (name_buf
), "d%d", regnum
<< 1);
8732 double_regnum
= user_reg_map_name_to_regnum (gdbarch
, name_buf
,
8735 /* d0 is always the least significant half of q0. */
8736 if (gdbarch_byte_order (gdbarch
) == BFD_ENDIAN_BIG
)
8741 status
= regcache_raw_read (regcache
, double_regnum
, reg_buf
);
8742 if (status
!= REG_VALID
)
8744 memcpy (buf
+ offset
, reg_buf
, 8);
8746 offset
= 8 - offset
;
8747 status
= regcache_raw_read (regcache
, double_regnum
+ 1, reg_buf
);
8748 if (status
!= REG_VALID
)
8750 memcpy (buf
+ offset
, reg_buf
, 8);
8755 static enum register_status
8756 arm_pseudo_read (struct gdbarch
*gdbarch
, struct regcache
*regcache
,
8757 int regnum
, gdb_byte
*buf
)
8759 const int num_regs
= gdbarch_num_regs (gdbarch
);
8761 gdb_byte reg_buf
[8];
8762 int offset
, double_regnum
;
8764 gdb_assert (regnum
>= num_regs
);
8767 if (gdbarch_tdep (gdbarch
)->have_neon_pseudos
&& regnum
>= 32 && regnum
< 48)
8768 /* Quad-precision register. */
8769 return arm_neon_quad_read (gdbarch
, regcache
, regnum
- 32, buf
);
8772 enum register_status status
;
8774 /* Single-precision register. */
8775 gdb_assert (regnum
< 32);
8777 /* s0 is always the least significant half of d0. */
8778 if (gdbarch_byte_order (gdbarch
) == BFD_ENDIAN_BIG
)
8779 offset
= (regnum
& 1) ? 0 : 4;
8781 offset
= (regnum
& 1) ? 4 : 0;
8783 xsnprintf (name_buf
, sizeof (name_buf
), "d%d", regnum
>> 1);
8784 double_regnum
= user_reg_map_name_to_regnum (gdbarch
, name_buf
,
8787 status
= regcache_raw_read (regcache
, double_regnum
, reg_buf
);
8788 if (status
== REG_VALID
)
8789 memcpy (buf
, reg_buf
+ offset
, 4);
8794 /* Store the contents of BUF to a NEON quad register, by writing to
8795 two double registers. This is used to implement the quad pseudo
8796 registers, and for argument passing in case the quad registers are
8797 missing; vectors are passed in quad registers when using the VFP
8798 ABI, even if a NEON unit is not present. REGNUM is the index
8799 of the quad register, in [0, 15]. */
8802 arm_neon_quad_write (struct gdbarch
*gdbarch
, struct regcache
*regcache
,
8803 int regnum
, const gdb_byte
*buf
)
8806 int offset
, double_regnum
;
8808 xsnprintf (name_buf
, sizeof (name_buf
), "d%d", regnum
<< 1);
8809 double_regnum
= user_reg_map_name_to_regnum (gdbarch
, name_buf
,
8812 /* d0 is always the least significant half of q0. */
8813 if (gdbarch_byte_order (gdbarch
) == BFD_ENDIAN_BIG
)
8818 regcache_raw_write (regcache
, double_regnum
, buf
+ offset
);
8819 offset
= 8 - offset
;
8820 regcache_raw_write (regcache
, double_regnum
+ 1, buf
+ offset
);
8824 arm_pseudo_write (struct gdbarch
*gdbarch
, struct regcache
*regcache
,
8825 int regnum
, const gdb_byte
*buf
)
8827 const int num_regs
= gdbarch_num_regs (gdbarch
);
8829 gdb_byte reg_buf
[8];
8830 int offset
, double_regnum
;
8832 gdb_assert (regnum
>= num_regs
);
8835 if (gdbarch_tdep (gdbarch
)->have_neon_pseudos
&& regnum
>= 32 && regnum
< 48)
8836 /* Quad-precision register. */
8837 arm_neon_quad_write (gdbarch
, regcache
, regnum
- 32, buf
);
8840 /* Single-precision register. */
8841 gdb_assert (regnum
< 32);
8843 /* s0 is always the least significant half of d0. */
8844 if (gdbarch_byte_order (gdbarch
) == BFD_ENDIAN_BIG
)
8845 offset
= (regnum
& 1) ? 0 : 4;
8847 offset
= (regnum
& 1) ? 4 : 0;
8849 xsnprintf (name_buf
, sizeof (name_buf
), "d%d", regnum
>> 1);
8850 double_regnum
= user_reg_map_name_to_regnum (gdbarch
, name_buf
,
8853 regcache_raw_read (regcache
, double_regnum
, reg_buf
);
8854 memcpy (reg_buf
+ offset
, buf
, 4);
8855 regcache_raw_write (regcache
, double_regnum
, reg_buf
);
8859 static struct value
*
8860 value_of_arm_user_reg (struct frame_info
*frame
, const void *baton
)
8862 const int *reg_p
= (const int *) baton
;
8863 return value_of_register (*reg_p
, frame
);
8866 static enum gdb_osabi
8867 arm_elf_osabi_sniffer (bfd
*abfd
)
8869 unsigned int elfosabi
;
8870 enum gdb_osabi osabi
= GDB_OSABI_UNKNOWN
;
8872 elfosabi
= elf_elfheader (abfd
)->e_ident
[EI_OSABI
];
8874 if (elfosabi
== ELFOSABI_ARM
)
8875 /* GNU tools use this value. Check note sections in this case,
8877 bfd_map_over_sections (abfd
,
8878 generic_elf_osabi_sniff_abi_tag_sections
,
8881 /* Anything else will be handled by the generic ELF sniffer. */
8886 arm_register_reggroup_p (struct gdbarch
*gdbarch
, int regnum
,
8887 struct reggroup
*group
)
8889 /* FPS register's type is INT, but belongs to float_reggroup. Beside
8890 this, FPS register belongs to save_regroup, restore_reggroup, and
8891 all_reggroup, of course. */
8892 if (regnum
== ARM_FPS_REGNUM
)
8893 return (group
== float_reggroup
8894 || group
== save_reggroup
8895 || group
== restore_reggroup
8896 || group
== all_reggroup
);
8898 return default_register_reggroup_p (gdbarch
, regnum
, group
);
8902 /* For backward-compatibility we allow two 'g' packet lengths with
8903 the remote protocol depending on whether FPA registers are
8904 supplied. M-profile targets do not have FPA registers, but some
8905 stubs already exist in the wild which use a 'g' packet which
8906 supplies them albeit with dummy values. The packet format which
8907 includes FPA registers should be considered deprecated for
8908 M-profile targets. */
8911 arm_register_g_packet_guesses (struct gdbarch
*gdbarch
)
8913 if (gdbarch_tdep (gdbarch
)->is_m
)
8915 /* If we know from the executable this is an M-profile target,
8916 cater for remote targets whose register set layout is the
8917 same as the FPA layout. */
8918 register_remote_g_packet_guess (gdbarch
,
8919 /* r0-r12,sp,lr,pc; f0-f7; fps,xpsr */
8920 (16 * INT_REGISTER_SIZE
)
8921 + (8 * FP_REGISTER_SIZE
)
8922 + (2 * INT_REGISTER_SIZE
),
8923 tdesc_arm_with_m_fpa_layout
);
8925 /* The regular M-profile layout. */
8926 register_remote_g_packet_guess (gdbarch
,
8927 /* r0-r12,sp,lr,pc; xpsr */
8928 (16 * INT_REGISTER_SIZE
)
8929 + INT_REGISTER_SIZE
,
8932 /* M-profile plus M4F VFP. */
8933 register_remote_g_packet_guess (gdbarch
,
8934 /* r0-r12,sp,lr,pc; d0-d15; fpscr,xpsr */
8935 (16 * INT_REGISTER_SIZE
)
8936 + (16 * VFP_REGISTER_SIZE
)
8937 + (2 * INT_REGISTER_SIZE
),
8938 tdesc_arm_with_m_vfp_d16
);
8941 /* Otherwise we don't have a useful guess. */
8944 /* Implement the code_of_frame_writable gdbarch method. */
8947 arm_code_of_frame_writable (struct gdbarch
*gdbarch
, struct frame_info
*frame
)
8949 if (gdbarch_tdep (gdbarch
)->is_m
8950 && get_frame_type (frame
) == SIGTRAMP_FRAME
)
8952 /* M-profile exception frames return to some magic PCs, where
8953 isn't writable at all. */
8961 /* Initialize the current architecture based on INFO. If possible,
8962 re-use an architecture from ARCHES, which is a list of
8963 architectures already created during this debugging session.
8965 Called e.g. at program startup, when reading a core file, and when
8966 reading a binary file. */
8968 static struct gdbarch
*
8969 arm_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
8971 struct gdbarch_tdep
*tdep
;
8972 struct gdbarch
*gdbarch
;
8973 struct gdbarch_list
*best_arch
;
8974 enum arm_abi_kind arm_abi
= arm_abi_global
;
8975 enum arm_float_model fp_model
= arm_fp_model
;
8976 struct tdesc_arch_data
*tdesc_data
= NULL
;
8978 int vfp_register_count
= 0, have_vfp_pseudos
= 0, have_neon_pseudos
= 0;
8979 int have_wmmx_registers
= 0;
8981 int have_fpa_registers
= 1;
8982 const struct target_desc
*tdesc
= info
.target_desc
;
8984 /* If we have an object to base this architecture on, try to determine
8987 if (arm_abi
== ARM_ABI_AUTO
&& info
.abfd
!= NULL
)
8989 int ei_osabi
, e_flags
;
8991 switch (bfd_get_flavour (info
.abfd
))
8993 case bfd_target_aout_flavour
:
8994 /* Assume it's an old APCS-style ABI. */
8995 arm_abi
= ARM_ABI_APCS
;
8998 case bfd_target_coff_flavour
:
8999 /* Assume it's an old APCS-style ABI. */
9001 arm_abi
= ARM_ABI_APCS
;
9004 case bfd_target_elf_flavour
:
9005 ei_osabi
= elf_elfheader (info
.abfd
)->e_ident
[EI_OSABI
];
9006 e_flags
= elf_elfheader (info
.abfd
)->e_flags
;
9008 if (ei_osabi
== ELFOSABI_ARM
)
9010 /* GNU tools used to use this value, but do not for EABI
9011 objects. There's nowhere to tag an EABI version
9012 anyway, so assume APCS. */
9013 arm_abi
= ARM_ABI_APCS
;
9015 else if (ei_osabi
== ELFOSABI_NONE
|| ei_osabi
== ELFOSABI_GNU
)
9017 int eabi_ver
= EF_ARM_EABI_VERSION (e_flags
);
9018 int attr_arch
, attr_profile
;
9022 case EF_ARM_EABI_UNKNOWN
:
9023 /* Assume GNU tools. */
9024 arm_abi
= ARM_ABI_APCS
;
9027 case EF_ARM_EABI_VER4
:
9028 case EF_ARM_EABI_VER5
:
9029 arm_abi
= ARM_ABI_AAPCS
;
9030 /* EABI binaries default to VFP float ordering.
9031 They may also contain build attributes that can
9032 be used to identify if the VFP argument-passing
9034 if (fp_model
== ARM_FLOAT_AUTO
)
9037 switch (bfd_elf_get_obj_attr_int (info
.abfd
,
9041 case AEABI_VFP_args_base
:
9042 /* "The user intended FP parameter/result
9043 passing to conform to AAPCS, base
9045 fp_model
= ARM_FLOAT_SOFT_VFP
;
9047 case AEABI_VFP_args_vfp
:
9048 /* "The user intended FP parameter/result
9049 passing to conform to AAPCS, VFP
9051 fp_model
= ARM_FLOAT_VFP
;
9053 case AEABI_VFP_args_toolchain
:
9054 /* "The user intended FP parameter/result
9055 passing to conform to tool chain-specific
9056 conventions" - we don't know any such
9057 conventions, so leave it as "auto". */
9059 case AEABI_VFP_args_compatible
:
9060 /* "Code is compatible with both the base
9061 and VFP variants; the user did not permit
9062 non-variadic functions to pass FP
9063 parameters/results" - leave it as
9067 /* Attribute value not mentioned in the
9068 November 2012 ABI, so leave it as
9073 fp_model
= ARM_FLOAT_SOFT_VFP
;
9079 /* Leave it as "auto". */
9080 warning (_("unknown ARM EABI version 0x%x"), eabi_ver
);
9085 /* Detect M-profile programs. This only works if the
9086 executable file includes build attributes; GCC does
9087 copy them to the executable, but e.g. RealView does
9089 attr_arch
= bfd_elf_get_obj_attr_int (info
.abfd
, OBJ_ATTR_PROC
,
9091 attr_profile
= bfd_elf_get_obj_attr_int (info
.abfd
,
9093 Tag_CPU_arch_profile
);
9094 /* GCC specifies the profile for v6-M; RealView only
9095 specifies the profile for architectures starting with
9096 V7 (as opposed to architectures with a tag
9097 numerically greater than TAG_CPU_ARCH_V7). */
9098 if (!tdesc_has_registers (tdesc
)
9099 && (attr_arch
== TAG_CPU_ARCH_V6_M
9100 || attr_arch
== TAG_CPU_ARCH_V6S_M
9101 || attr_profile
== 'M'))
9106 if (fp_model
== ARM_FLOAT_AUTO
)
9108 int e_flags
= elf_elfheader (info
.abfd
)->e_flags
;
9110 switch (e_flags
& (EF_ARM_SOFT_FLOAT
| EF_ARM_VFP_FLOAT
))
9113 /* Leave it as "auto". Strictly speaking this case
9114 means FPA, but almost nobody uses that now, and
9115 many toolchains fail to set the appropriate bits
9116 for the floating-point model they use. */
9118 case EF_ARM_SOFT_FLOAT
:
9119 fp_model
= ARM_FLOAT_SOFT_FPA
;
9121 case EF_ARM_VFP_FLOAT
:
9122 fp_model
= ARM_FLOAT_VFP
;
9124 case EF_ARM_SOFT_FLOAT
| EF_ARM_VFP_FLOAT
:
9125 fp_model
= ARM_FLOAT_SOFT_VFP
;
9130 if (e_flags
& EF_ARM_BE8
)
9131 info
.byte_order_for_code
= BFD_ENDIAN_LITTLE
;
9136 /* Leave it as "auto". */
9141 /* Check any target description for validity. */
9142 if (tdesc_has_registers (tdesc
))
9144 /* For most registers we require GDB's default names; but also allow
9145 the numeric names for sp / lr / pc, as a convenience. */
9146 static const char *const arm_sp_names
[] = { "r13", "sp", NULL
};
9147 static const char *const arm_lr_names
[] = { "r14", "lr", NULL
};
9148 static const char *const arm_pc_names
[] = { "r15", "pc", NULL
};
9150 const struct tdesc_feature
*feature
;
9153 feature
= tdesc_find_feature (tdesc
,
9154 "org.gnu.gdb.arm.core");
9155 if (feature
== NULL
)
9157 feature
= tdesc_find_feature (tdesc
,
9158 "org.gnu.gdb.arm.m-profile");
9159 if (feature
== NULL
)
9165 tdesc_data
= tdesc_data_alloc ();
9168 for (i
= 0; i
< ARM_SP_REGNUM
; i
++)
9169 valid_p
&= tdesc_numbered_register (feature
, tdesc_data
, i
,
9170 arm_register_names
[i
]);
9171 valid_p
&= tdesc_numbered_register_choices (feature
, tdesc_data
,
9174 valid_p
&= tdesc_numbered_register_choices (feature
, tdesc_data
,
9177 valid_p
&= tdesc_numbered_register_choices (feature
, tdesc_data
,
9181 valid_p
&= tdesc_numbered_register (feature
, tdesc_data
,
9182 ARM_PS_REGNUM
, "xpsr");
9184 valid_p
&= tdesc_numbered_register (feature
, tdesc_data
,
9185 ARM_PS_REGNUM
, "cpsr");
9189 tdesc_data_cleanup (tdesc_data
);
9193 feature
= tdesc_find_feature (tdesc
,
9194 "org.gnu.gdb.arm.fpa");
9195 if (feature
!= NULL
)
9198 for (i
= ARM_F0_REGNUM
; i
<= ARM_FPS_REGNUM
; i
++)
9199 valid_p
&= tdesc_numbered_register (feature
, tdesc_data
, i
,
9200 arm_register_names
[i
]);
9203 tdesc_data_cleanup (tdesc_data
);
9208 have_fpa_registers
= 0;
9210 feature
= tdesc_find_feature (tdesc
,
9211 "org.gnu.gdb.xscale.iwmmxt");
9212 if (feature
!= NULL
)
9214 static const char *const iwmmxt_names
[] = {
9215 "wR0", "wR1", "wR2", "wR3", "wR4", "wR5", "wR6", "wR7",
9216 "wR8", "wR9", "wR10", "wR11", "wR12", "wR13", "wR14", "wR15",
9217 "wCID", "wCon", "wCSSF", "wCASF", "", "", "", "",
9218 "wCGR0", "wCGR1", "wCGR2", "wCGR3", "", "", "", "",
9222 for (i
= ARM_WR0_REGNUM
; i
<= ARM_WR15_REGNUM
; i
++)
9224 &= tdesc_numbered_register (feature
, tdesc_data
, i
,
9225 iwmmxt_names
[i
- ARM_WR0_REGNUM
]);
9227 /* Check for the control registers, but do not fail if they
9229 for (i
= ARM_WC0_REGNUM
; i
<= ARM_WCASF_REGNUM
; i
++)
9230 tdesc_numbered_register (feature
, tdesc_data
, i
,
9231 iwmmxt_names
[i
- ARM_WR0_REGNUM
]);
9233 for (i
= ARM_WCGR0_REGNUM
; i
<= ARM_WCGR3_REGNUM
; i
++)
9235 &= tdesc_numbered_register (feature
, tdesc_data
, i
,
9236 iwmmxt_names
[i
- ARM_WR0_REGNUM
]);
9240 tdesc_data_cleanup (tdesc_data
);
9244 have_wmmx_registers
= 1;
9247 /* If we have a VFP unit, check whether the single precision registers
9248 are present. If not, then we will synthesize them as pseudo
9250 feature
= tdesc_find_feature (tdesc
,
9251 "org.gnu.gdb.arm.vfp");
9252 if (feature
!= NULL
)
9254 static const char *const vfp_double_names
[] = {
9255 "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7",
9256 "d8", "d9", "d10", "d11", "d12", "d13", "d14", "d15",
9257 "d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23",
9258 "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31",
9261 /* Require the double precision registers. There must be either
9264 for (i
= 0; i
< 32; i
++)
9266 valid_p
&= tdesc_numbered_register (feature
, tdesc_data
,
9268 vfp_double_names
[i
]);
9272 if (!valid_p
&& i
== 16)
9275 /* Also require FPSCR. */
9276 valid_p
&= tdesc_numbered_register (feature
, tdesc_data
,
9277 ARM_FPSCR_REGNUM
, "fpscr");
9280 tdesc_data_cleanup (tdesc_data
);
9284 if (tdesc_unnumbered_register (feature
, "s0") == 0)
9285 have_vfp_pseudos
= 1;
9287 vfp_register_count
= i
;
9289 /* If we have VFP, also check for NEON. The architecture allows
9290 NEON without VFP (integer vector operations only), but GDB
9291 does not support that. */
9292 feature
= tdesc_find_feature (tdesc
,
9293 "org.gnu.gdb.arm.neon");
9294 if (feature
!= NULL
)
9296 /* NEON requires 32 double-precision registers. */
9299 tdesc_data_cleanup (tdesc_data
);
9303 /* If there are quad registers defined by the stub, use
9304 their type; otherwise (normally) provide them with
9305 the default type. */
9306 if (tdesc_unnumbered_register (feature
, "q0") == 0)
9307 have_neon_pseudos
= 1;
9314 /* If there is already a candidate, use it. */
9315 for (best_arch
= gdbarch_list_lookup_by_info (arches
, &info
);
9317 best_arch
= gdbarch_list_lookup_by_info (best_arch
->next
, &info
))
9319 if (arm_abi
!= ARM_ABI_AUTO
9320 && arm_abi
!= gdbarch_tdep (best_arch
->gdbarch
)->arm_abi
)
9323 if (fp_model
!= ARM_FLOAT_AUTO
9324 && fp_model
!= gdbarch_tdep (best_arch
->gdbarch
)->fp_model
)
9327 /* There are various other properties in tdep that we do not
9328 need to check here: those derived from a target description,
9329 since gdbarches with a different target description are
9330 automatically disqualified. */
9332 /* Do check is_m, though, since it might come from the binary. */
9333 if (is_m
!= gdbarch_tdep (best_arch
->gdbarch
)->is_m
)
9336 /* Found a match. */
9340 if (best_arch
!= NULL
)
9342 if (tdesc_data
!= NULL
)
9343 tdesc_data_cleanup (tdesc_data
);
9344 return best_arch
->gdbarch
;
9347 tdep
= XCNEW (struct gdbarch_tdep
);
9348 gdbarch
= gdbarch_alloc (&info
, tdep
);
9350 /* Record additional information about the architecture we are defining.
9351 These are gdbarch discriminators, like the OSABI. */
9352 tdep
->arm_abi
= arm_abi
;
9353 tdep
->fp_model
= fp_model
;
9355 tdep
->have_fpa_registers
= have_fpa_registers
;
9356 tdep
->have_wmmx_registers
= have_wmmx_registers
;
9357 gdb_assert (vfp_register_count
== 0
9358 || vfp_register_count
== 16
9359 || vfp_register_count
== 32);
9360 tdep
->vfp_register_count
= vfp_register_count
;
9361 tdep
->have_vfp_pseudos
= have_vfp_pseudos
;
9362 tdep
->have_neon_pseudos
= have_neon_pseudos
;
9363 tdep
->have_neon
= have_neon
;
9365 arm_register_g_packet_guesses (gdbarch
);
9368 switch (info
.byte_order_for_code
)
9370 case BFD_ENDIAN_BIG
:
9371 tdep
->arm_breakpoint
= arm_default_arm_be_breakpoint
;
9372 tdep
->arm_breakpoint_size
= sizeof (arm_default_arm_be_breakpoint
);
9373 tdep
->thumb_breakpoint
= arm_default_thumb_be_breakpoint
;
9374 tdep
->thumb_breakpoint_size
= sizeof (arm_default_thumb_be_breakpoint
);
9378 case BFD_ENDIAN_LITTLE
:
9379 tdep
->arm_breakpoint
= arm_default_arm_le_breakpoint
;
9380 tdep
->arm_breakpoint_size
= sizeof (arm_default_arm_le_breakpoint
);
9381 tdep
->thumb_breakpoint
= arm_default_thumb_le_breakpoint
;
9382 tdep
->thumb_breakpoint_size
= sizeof (arm_default_thumb_le_breakpoint
);
9387 internal_error (__FILE__
, __LINE__
,
9388 _("arm_gdbarch_init: bad byte order for float format"));
9391 /* On ARM targets char defaults to unsigned. */
9392 set_gdbarch_char_signed (gdbarch
, 0);
9394 /* Note: for displaced stepping, this includes the breakpoint, and one word
9395 of additional scratch space. This setting isn't used for anything beside
9396 displaced stepping at present. */
9397 set_gdbarch_max_insn_length (gdbarch
, 4 * DISPLACED_MODIFIED_INSNS
);
9399 /* This should be low enough for everything. */
9400 tdep
->lowest_pc
= 0x20;
9401 tdep
->jb_pc
= -1; /* Longjump support not enabled by default. */
9403 /* The default, for both APCS and AAPCS, is to return small
9404 structures in registers. */
9405 tdep
->struct_return
= reg_struct_return
;
9407 set_gdbarch_push_dummy_call (gdbarch
, arm_push_dummy_call
);
9408 set_gdbarch_frame_align (gdbarch
, arm_frame_align
);
9411 set_gdbarch_code_of_frame_writable (gdbarch
, arm_code_of_frame_writable
);
9413 set_gdbarch_write_pc (gdbarch
, arm_write_pc
);
9415 /* Frame handling. */
9416 set_gdbarch_dummy_id (gdbarch
, arm_dummy_id
);
9417 set_gdbarch_unwind_pc (gdbarch
, arm_unwind_pc
);
9418 set_gdbarch_unwind_sp (gdbarch
, arm_unwind_sp
);
9420 frame_base_set_default (gdbarch
, &arm_normal_base
);
9422 /* Address manipulation. */
9423 set_gdbarch_addr_bits_remove (gdbarch
, arm_addr_bits_remove
);
9425 /* Advance PC across function entry code. */
9426 set_gdbarch_skip_prologue (gdbarch
, arm_skip_prologue
);
9428 /* Detect whether PC is at a point where the stack has been destroyed. */
9429 set_gdbarch_stack_frame_destroyed_p (gdbarch
, arm_stack_frame_destroyed_p
);
9431 /* Skip trampolines. */
9432 set_gdbarch_skip_trampoline_code (gdbarch
, arm_skip_stub
);
9434 /* The stack grows downward. */
9435 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
9437 /* Breakpoint manipulation. */
9438 set_gdbarch_breakpoint_kind_from_pc (gdbarch
, arm_breakpoint_kind_from_pc
);
9439 set_gdbarch_sw_breakpoint_from_kind (gdbarch
, arm_sw_breakpoint_from_kind
);
9440 set_gdbarch_breakpoint_kind_from_current_state (gdbarch
,
9441 arm_breakpoint_kind_from_current_state
);
9443 /* Information about registers, etc. */
9444 set_gdbarch_sp_regnum (gdbarch
, ARM_SP_REGNUM
);
9445 set_gdbarch_pc_regnum (gdbarch
, ARM_PC_REGNUM
);
9446 set_gdbarch_num_regs (gdbarch
, ARM_NUM_REGS
);
9447 set_gdbarch_register_type (gdbarch
, arm_register_type
);
9448 set_gdbarch_register_reggroup_p (gdbarch
, arm_register_reggroup_p
);
9450 /* This "info float" is FPA-specific. Use the generic version if we
9452 if (gdbarch_tdep (gdbarch
)->have_fpa_registers
)
9453 set_gdbarch_print_float_info (gdbarch
, arm_print_float_info
);
9455 /* Internal <-> external register number maps. */
9456 set_gdbarch_dwarf2_reg_to_regnum (gdbarch
, arm_dwarf_reg_to_regnum
);
9457 set_gdbarch_register_sim_regno (gdbarch
, arm_register_sim_regno
);
9459 set_gdbarch_register_name (gdbarch
, arm_register_name
);
9461 /* Returning results. */
9462 set_gdbarch_return_value (gdbarch
, arm_return_value
);
9465 set_gdbarch_print_insn (gdbarch
, gdb_print_insn_arm
);
9467 /* Minsymbol frobbing. */
9468 set_gdbarch_elf_make_msymbol_special (gdbarch
, arm_elf_make_msymbol_special
);
9469 set_gdbarch_coff_make_msymbol_special (gdbarch
,
9470 arm_coff_make_msymbol_special
);
9471 set_gdbarch_record_special_symbol (gdbarch
, arm_record_special_symbol
);
9473 /* Thumb-2 IT block support. */
9474 set_gdbarch_adjust_breakpoint_address (gdbarch
,
9475 arm_adjust_breakpoint_address
);
9477 /* Virtual tables. */
9478 set_gdbarch_vbit_in_delta (gdbarch
, 1);
9480 /* Hook in the ABI-specific overrides, if they have been registered. */
9481 gdbarch_init_osabi (info
, gdbarch
);
9483 dwarf2_frame_set_init_reg (gdbarch
, arm_dwarf2_frame_init_reg
);
9485 /* Add some default predicates. */
9487 frame_unwind_append_unwinder (gdbarch
, &arm_m_exception_unwind
);
9488 frame_unwind_append_unwinder (gdbarch
, &arm_stub_unwind
);
9489 dwarf2_append_unwinders (gdbarch
);
9490 frame_unwind_append_unwinder (gdbarch
, &arm_exidx_unwind
);
9491 frame_unwind_append_unwinder (gdbarch
, &arm_epilogue_frame_unwind
);
9492 frame_unwind_append_unwinder (gdbarch
, &arm_prologue_unwind
);
9494 /* Now we have tuned the configuration, set a few final things,
9495 based on what the OS ABI has told us. */
9497 /* If the ABI is not otherwise marked, assume the old GNU APCS. EABI
9498 binaries are always marked. */
9499 if (tdep
->arm_abi
== ARM_ABI_AUTO
)
9500 tdep
->arm_abi
= ARM_ABI_APCS
;
9502 /* Watchpoints are not steppable. */
9503 set_gdbarch_have_nonsteppable_watchpoint (gdbarch
, 1);
9505 /* We used to default to FPA for generic ARM, but almost nobody
9506 uses that now, and we now provide a way for the user to force
9507 the model. So default to the most useful variant. */
9508 if (tdep
->fp_model
== ARM_FLOAT_AUTO
)
9509 tdep
->fp_model
= ARM_FLOAT_SOFT_FPA
;
9511 if (tdep
->jb_pc
>= 0)
9512 set_gdbarch_get_longjmp_target (gdbarch
, arm_get_longjmp_target
);
9514 /* Floating point sizes and format. */
9515 set_gdbarch_float_format (gdbarch
, floatformats_ieee_single
);
9516 if (tdep
->fp_model
== ARM_FLOAT_SOFT_FPA
|| tdep
->fp_model
== ARM_FLOAT_FPA
)
9518 set_gdbarch_double_format
9519 (gdbarch
, floatformats_ieee_double_littlebyte_bigword
);
9520 set_gdbarch_long_double_format
9521 (gdbarch
, floatformats_ieee_double_littlebyte_bigword
);
9525 set_gdbarch_double_format (gdbarch
, floatformats_ieee_double
);
9526 set_gdbarch_long_double_format (gdbarch
, floatformats_ieee_double
);
9529 if (have_vfp_pseudos
)
9531 /* NOTE: These are the only pseudo registers used by
9532 the ARM target at the moment. If more are added, a
9533 little more care in numbering will be needed. */
9535 int num_pseudos
= 32;
9536 if (have_neon_pseudos
)
9538 set_gdbarch_num_pseudo_regs (gdbarch
, num_pseudos
);
9539 set_gdbarch_pseudo_register_read (gdbarch
, arm_pseudo_read
);
9540 set_gdbarch_pseudo_register_write (gdbarch
, arm_pseudo_write
);
9545 set_tdesc_pseudo_register_name (gdbarch
, arm_register_name
);
9547 tdesc_use_registers (gdbarch
, tdesc
, tdesc_data
);
9549 /* Override tdesc_register_type to adjust the types of VFP
9550 registers for NEON. */
9551 set_gdbarch_register_type (gdbarch
, arm_register_type
);
9554 /* Add standard register aliases. We add aliases even for those
9555 nanes which are used by the current architecture - it's simpler,
9556 and does no harm, since nothing ever lists user registers. */
9557 for (i
= 0; i
< ARRAY_SIZE (arm_register_aliases
); i
++)
9558 user_reg_add (gdbarch
, arm_register_aliases
[i
].name
,
9559 value_of_arm_user_reg
, &arm_register_aliases
[i
].regnum
);
9565 arm_dump_tdep (struct gdbarch
*gdbarch
, struct ui_file
*file
)
9567 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
9572 fprintf_unfiltered (file
, _("arm_dump_tdep: Lowest pc = 0x%lx"),
9573 (unsigned long) tdep
->lowest_pc
);
9576 extern initialize_file_ftype _initialize_arm_tdep
; /* -Wmissing-prototypes */
9579 _initialize_arm_tdep (void)
9581 struct ui_file
*stb
;
9583 const char *setname
;
9584 const char *setdesc
;
9585 const char *const *regnames
;
9587 static std::string helptext
;
9588 char regdesc
[1024], *rdptr
= regdesc
;
9589 size_t rest
= sizeof (regdesc
);
9591 gdbarch_register (bfd_arch_arm
, arm_gdbarch_init
, arm_dump_tdep
);
9593 arm_objfile_data_key
9594 = register_objfile_data_with_cleanup (NULL
, arm_objfile_data_free
);
9596 /* Add ourselves to objfile event chain. */
9597 observer_attach_new_objfile (arm_exidx_new_objfile
);
9599 = register_objfile_data_with_cleanup (NULL
, arm_exidx_data_free
);
9601 /* Register an ELF OS ABI sniffer for ARM binaries. */
9602 gdbarch_register_osabi_sniffer (bfd_arch_arm
,
9603 bfd_target_elf_flavour
,
9604 arm_elf_osabi_sniffer
);
9606 /* Initialize the standard target descriptions. */
9607 initialize_tdesc_arm_with_m ();
9608 initialize_tdesc_arm_with_m_fpa_layout ();
9609 initialize_tdesc_arm_with_m_vfp_d16 ();
9610 initialize_tdesc_arm_with_iwmmxt ();
9611 initialize_tdesc_arm_with_vfpv2 ();
9612 initialize_tdesc_arm_with_vfpv3 ();
9613 initialize_tdesc_arm_with_neon ();
9615 /* Get the number of possible sets of register names defined in opcodes. */
9616 num_disassembly_options
= get_arm_regname_num_options ();
9618 /* Add root prefix command for all "set arm"/"show arm" commands. */
9619 add_prefix_cmd ("arm", no_class
, set_arm_command
,
9620 _("Various ARM-specific commands."),
9621 &setarmcmdlist
, "set arm ", 0, &setlist
);
9623 add_prefix_cmd ("arm", no_class
, show_arm_command
,
9624 _("Various ARM-specific commands."),
9625 &showarmcmdlist
, "show arm ", 0, &showlist
);
9627 /* Sync the opcode insn printer with our register viewer. */
9628 parse_arm_disassembler_option ("reg-names-std");
9630 /* Initialize the array that will be passed to
9631 add_setshow_enum_cmd(). */
9632 valid_disassembly_styles
= XNEWVEC (const char *,
9633 num_disassembly_options
+ 1);
9634 for (i
= 0; i
< num_disassembly_options
; i
++)
9636 get_arm_regnames (i
, &setname
, &setdesc
, ®names
);
9637 valid_disassembly_styles
[i
] = setname
;
9638 length
= snprintf (rdptr
, rest
, "%s - %s\n", setname
, setdesc
);
9641 /* When we find the default names, tell the disassembler to use
9643 if (!strcmp (setname
, "std"))
9645 disassembly_style
= setname
;
9646 set_arm_regname_option (i
);
9649 /* Mark the end of valid options. */
9650 valid_disassembly_styles
[num_disassembly_options
] = NULL
;
9652 /* Create the help text. */
9653 stb
= mem_fileopen ();
9654 fprintf_unfiltered (stb
, "%s%s%s",
9655 _("The valid values are:\n"),
9657 _("The default is \"std\"."));
9658 helptext
= ui_file_as_string (stb
);
9659 ui_file_delete (stb
);
9661 add_setshow_enum_cmd("disassembler", no_class
,
9662 valid_disassembly_styles
, &disassembly_style
,
9663 _("Set the disassembly style."),
9664 _("Show the disassembly style."),
9666 set_disassembly_style_sfunc
,
9667 NULL
, /* FIXME: i18n: The disassembly style is
9669 &setarmcmdlist
, &showarmcmdlist
);
9671 add_setshow_boolean_cmd ("apcs32", no_class
, &arm_apcs_32
,
9672 _("Set usage of ARM 32-bit mode."),
9673 _("Show usage of ARM 32-bit mode."),
9674 _("When off, a 26-bit PC will be used."),
9676 NULL
, /* FIXME: i18n: Usage of ARM 32-bit
9678 &setarmcmdlist
, &showarmcmdlist
);
9680 /* Add a command to allow the user to force the FPU model. */
9681 add_setshow_enum_cmd ("fpu", no_class
, fp_model_strings
, ¤t_fp_model
,
9682 _("Set the floating point type."),
9683 _("Show the floating point type."),
9684 _("auto - Determine the FP typefrom the OS-ABI.\n\
9685 softfpa - Software FP, mixed-endian doubles on little-endian ARMs.\n\
9686 fpa - FPA co-processor (GCC compiled).\n\
9687 softvfp - Software FP with pure-endian doubles.\n\
9688 vfp - VFP co-processor."),
9689 set_fp_model_sfunc
, show_fp_model
,
9690 &setarmcmdlist
, &showarmcmdlist
);
9692 /* Add a command to allow the user to force the ABI. */
9693 add_setshow_enum_cmd ("abi", class_support
, arm_abi_strings
, &arm_abi_string
,
9696 NULL
, arm_set_abi
, arm_show_abi
,
9697 &setarmcmdlist
, &showarmcmdlist
);
9699 /* Add two commands to allow the user to force the assumed
9701 add_setshow_enum_cmd ("fallback-mode", class_support
,
9702 arm_mode_strings
, &arm_fallback_mode_string
,
9703 _("Set the mode assumed when symbols are unavailable."),
9704 _("Show the mode assumed when symbols are unavailable."),
9705 NULL
, NULL
, arm_show_fallback_mode
,
9706 &setarmcmdlist
, &showarmcmdlist
);
9707 add_setshow_enum_cmd ("force-mode", class_support
,
9708 arm_mode_strings
, &arm_force_mode_string
,
9709 _("Set the mode assumed even when symbols are available."),
9710 _("Show the mode assumed even when symbols are available."),
9711 NULL
, NULL
, arm_show_force_mode
,
9712 &setarmcmdlist
, &showarmcmdlist
);
9714 /* Debugging flag. */
9715 add_setshow_boolean_cmd ("arm", class_maintenance
, &arm_debug
,
9716 _("Set ARM debugging."),
9717 _("Show ARM debugging."),
9718 _("When on, arm-specific debugging is enabled."),
9720 NULL
, /* FIXME: i18n: "ARM debugging is %s. */
9721 &setdebuglist
, &showdebuglist
);
9724 /* ARM-reversible process record data structures. */
9726 #define ARM_INSN_SIZE_BYTES 4
9727 #define THUMB_INSN_SIZE_BYTES 2
9728 #define THUMB2_INSN_SIZE_BYTES 4
9731 /* Position of the bit within a 32-bit ARM instruction
9732 that defines whether the instruction is a load or store. */
9733 #define INSN_S_L_BIT_NUM 20
9735 #define REG_ALLOC(REGS, LENGTH, RECORD_BUF) \
9738 unsigned int reg_len = LENGTH; \
9741 REGS = XNEWVEC (uint32_t, reg_len); \
9742 memcpy(®S[0], &RECORD_BUF[0], sizeof(uint32_t)*LENGTH); \
9747 #define MEM_ALLOC(MEMS, LENGTH, RECORD_BUF) \
9750 unsigned int mem_len = LENGTH; \
9753 MEMS = XNEWVEC (struct arm_mem_r, mem_len); \
9754 memcpy(&MEMS->len, &RECORD_BUF[0], \
9755 sizeof(struct arm_mem_r) * LENGTH); \
9760 /* Checks whether insn is already recorded or yet to be decoded. (boolean expression). */
9761 #define INSN_RECORDED(ARM_RECORD) \
9762 (0 != (ARM_RECORD)->reg_rec_count || 0 != (ARM_RECORD)->mem_rec_count)
9764 /* ARM memory record structure. */
9767 uint32_t len
; /* Record length. */
9768 uint32_t addr
; /* Memory address. */
9771 /* ARM instruction record contains opcode of current insn
9772 and execution state (before entry to decode_insn()),
9773 contains list of to-be-modified registers and
9774 memory blocks (on return from decode_insn()). */
9776 typedef struct insn_decode_record_t
9778 struct gdbarch
*gdbarch
;
9779 struct regcache
*regcache
;
9780 CORE_ADDR this_addr
; /* Address of the insn being decoded. */
9781 uint32_t arm_insn
; /* Should accommodate thumb. */
9782 uint32_t cond
; /* Condition code. */
9783 uint32_t opcode
; /* Insn opcode. */
9784 uint32_t decode
; /* Insn decode bits. */
9785 uint32_t mem_rec_count
; /* No of mem records. */
9786 uint32_t reg_rec_count
; /* No of reg records. */
9787 uint32_t *arm_regs
; /* Registers to be saved for this record. */
9788 struct arm_mem_r
*arm_mems
; /* Memory to be saved for this record. */
9789 } insn_decode_record
;
9792 /* Checks ARM SBZ and SBO mandatory fields. */
9795 sbo_sbz (uint32_t insn
, uint32_t bit_num
, uint32_t len
, uint32_t sbo
)
9797 uint32_t ones
= bits (insn
, bit_num
- 1, (bit_num
-1) + (len
- 1));
9816 enum arm_record_result
9818 ARM_RECORD_SUCCESS
= 0,
9819 ARM_RECORD_FAILURE
= 1
9826 } arm_record_strx_t
;
9837 arm_record_strx (insn_decode_record
*arm_insn_r
, uint32_t *record_buf
,
9838 uint32_t *record_buf_mem
, arm_record_strx_t str_type
)
9841 struct regcache
*reg_cache
= arm_insn_r
->regcache
;
9842 ULONGEST u_regval
[2]= {0};
9844 uint32_t reg_src1
= 0, reg_src2
= 0;
9845 uint32_t immed_high
= 0, immed_low
= 0,offset_8
= 0, tgt_mem_addr
= 0;
9847 arm_insn_r
->opcode
= bits (arm_insn_r
->arm_insn
, 21, 24);
9848 arm_insn_r
->decode
= bits (arm_insn_r
->arm_insn
, 4, 7);
9850 if (14 == arm_insn_r
->opcode
|| 10 == arm_insn_r
->opcode
)
9852 /* 1) Handle misc store, immediate offset. */
9853 immed_low
= bits (arm_insn_r
->arm_insn
, 0, 3);
9854 immed_high
= bits (arm_insn_r
->arm_insn
, 8, 11);
9855 reg_src1
= bits (arm_insn_r
->arm_insn
, 16, 19);
9856 regcache_raw_read_unsigned (reg_cache
, reg_src1
,
9858 if (ARM_PC_REGNUM
== reg_src1
)
9860 /* If R15 was used as Rn, hence current PC+8. */
9861 u_regval
[0] = u_regval
[0] + 8;
9863 offset_8
= (immed_high
<< 4) | immed_low
;
9864 /* Calculate target store address. */
9865 if (14 == arm_insn_r
->opcode
)
9867 tgt_mem_addr
= u_regval
[0] + offset_8
;
9871 tgt_mem_addr
= u_regval
[0] - offset_8
;
9873 if (ARM_RECORD_STRH
== str_type
)
9875 record_buf_mem
[0] = 2;
9876 record_buf_mem
[1] = tgt_mem_addr
;
9877 arm_insn_r
->mem_rec_count
= 1;
9879 else if (ARM_RECORD_STRD
== str_type
)
9881 record_buf_mem
[0] = 4;
9882 record_buf_mem
[1] = tgt_mem_addr
;
9883 record_buf_mem
[2] = 4;
9884 record_buf_mem
[3] = tgt_mem_addr
+ 4;
9885 arm_insn_r
->mem_rec_count
= 2;
9888 else if (12 == arm_insn_r
->opcode
|| 8 == arm_insn_r
->opcode
)
9890 /* 2) Store, register offset. */
9892 reg_src1
= bits (arm_insn_r
->arm_insn
, 0, 3);
9894 reg_src2
= bits (arm_insn_r
->arm_insn
, 16, 19);
9895 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
[0]);
9896 regcache_raw_read_unsigned (reg_cache
, reg_src2
, &u_regval
[1]);
9899 /* If R15 was used as Rn, hence current PC+8. */
9900 u_regval
[0] = u_regval
[0] + 8;
9902 /* Calculate target store address, Rn +/- Rm, register offset. */
9903 if (12 == arm_insn_r
->opcode
)
9905 tgt_mem_addr
= u_regval
[0] + u_regval
[1];
9909 tgt_mem_addr
= u_regval
[1] - u_regval
[0];
9911 if (ARM_RECORD_STRH
== str_type
)
9913 record_buf_mem
[0] = 2;
9914 record_buf_mem
[1] = tgt_mem_addr
;
9915 arm_insn_r
->mem_rec_count
= 1;
9917 else if (ARM_RECORD_STRD
== str_type
)
9919 record_buf_mem
[0] = 4;
9920 record_buf_mem
[1] = tgt_mem_addr
;
9921 record_buf_mem
[2] = 4;
9922 record_buf_mem
[3] = tgt_mem_addr
+ 4;
9923 arm_insn_r
->mem_rec_count
= 2;
9926 else if (11 == arm_insn_r
->opcode
|| 15 == arm_insn_r
->opcode
9927 || 2 == arm_insn_r
->opcode
|| 6 == arm_insn_r
->opcode
)
9929 /* 3) Store, immediate pre-indexed. */
9930 /* 5) Store, immediate post-indexed. */
9931 immed_low
= bits (arm_insn_r
->arm_insn
, 0, 3);
9932 immed_high
= bits (arm_insn_r
->arm_insn
, 8, 11);
9933 offset_8
= (immed_high
<< 4) | immed_low
;
9934 reg_src1
= bits (arm_insn_r
->arm_insn
, 16, 19);
9935 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
[0]);
9936 /* Calculate target store address, Rn +/- Rm, register offset. */
9937 if (15 == arm_insn_r
->opcode
|| 6 == arm_insn_r
->opcode
)
9939 tgt_mem_addr
= u_regval
[0] + offset_8
;
9943 tgt_mem_addr
= u_regval
[0] - offset_8
;
9945 if (ARM_RECORD_STRH
== str_type
)
9947 record_buf_mem
[0] = 2;
9948 record_buf_mem
[1] = tgt_mem_addr
;
9949 arm_insn_r
->mem_rec_count
= 1;
9951 else if (ARM_RECORD_STRD
== str_type
)
9953 record_buf_mem
[0] = 4;
9954 record_buf_mem
[1] = tgt_mem_addr
;
9955 record_buf_mem
[2] = 4;
9956 record_buf_mem
[3] = tgt_mem_addr
+ 4;
9957 arm_insn_r
->mem_rec_count
= 2;
9959 /* Record Rn also as it changes. */
9960 *(record_buf
) = bits (arm_insn_r
->arm_insn
, 16, 19);
9961 arm_insn_r
->reg_rec_count
= 1;
9963 else if (9 == arm_insn_r
->opcode
|| 13 == arm_insn_r
->opcode
9964 || 0 == arm_insn_r
->opcode
|| 4 == arm_insn_r
->opcode
)
9966 /* 4) Store, register pre-indexed. */
9967 /* 6) Store, register post -indexed. */
9968 reg_src1
= bits (arm_insn_r
->arm_insn
, 0, 3);
9969 reg_src2
= bits (arm_insn_r
->arm_insn
, 16, 19);
9970 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
[0]);
9971 regcache_raw_read_unsigned (reg_cache
, reg_src2
, &u_regval
[1]);
9972 /* Calculate target store address, Rn +/- Rm, register offset. */
9973 if (13 == arm_insn_r
->opcode
|| 4 == arm_insn_r
->opcode
)
9975 tgt_mem_addr
= u_regval
[0] + u_regval
[1];
9979 tgt_mem_addr
= u_regval
[1] - u_regval
[0];
9981 if (ARM_RECORD_STRH
== str_type
)
9983 record_buf_mem
[0] = 2;
9984 record_buf_mem
[1] = tgt_mem_addr
;
9985 arm_insn_r
->mem_rec_count
= 1;
9987 else if (ARM_RECORD_STRD
== str_type
)
9989 record_buf_mem
[0] = 4;
9990 record_buf_mem
[1] = tgt_mem_addr
;
9991 record_buf_mem
[2] = 4;
9992 record_buf_mem
[3] = tgt_mem_addr
+ 4;
9993 arm_insn_r
->mem_rec_count
= 2;
9995 /* Record Rn also as it changes. */
9996 *(record_buf
) = bits (arm_insn_r
->arm_insn
, 16, 19);
9997 arm_insn_r
->reg_rec_count
= 1;
10002 /* Handling ARM extension space insns. */
10005 arm_record_extension_space (insn_decode_record
*arm_insn_r
)
10007 uint32_t ret
= 0; /* Return value: -1:record failure ; 0:success */
10008 uint32_t opcode1
= 0, opcode2
= 0, insn_op1
= 0;
10009 uint32_t record_buf
[8], record_buf_mem
[8];
10010 uint32_t reg_src1
= 0;
10011 struct regcache
*reg_cache
= arm_insn_r
->regcache
;
10012 ULONGEST u_regval
= 0;
10014 gdb_assert (!INSN_RECORDED(arm_insn_r
));
10015 /* Handle unconditional insn extension space. */
10017 opcode1
= bits (arm_insn_r
->arm_insn
, 20, 27);
10018 opcode2
= bits (arm_insn_r
->arm_insn
, 4, 7);
10019 if (arm_insn_r
->cond
)
10021 /* PLD has no affect on architectural state, it just affects
10023 if (5 == ((opcode1
& 0xE0) >> 5))
10026 record_buf
[0] = ARM_PS_REGNUM
;
10027 record_buf
[1] = ARM_LR_REGNUM
;
10028 arm_insn_r
->reg_rec_count
= 2;
10030 /* STC2, LDC2, MCR2, MRC2, CDP2: <TBD>, co-processor insn. */
10034 opcode1
= bits (arm_insn_r
->arm_insn
, 25, 27);
10035 if (3 == opcode1
&& bit (arm_insn_r
->arm_insn
, 4))
10038 /* Undefined instruction on ARM V5; need to handle if later
10039 versions define it. */
10042 opcode1
= bits (arm_insn_r
->arm_insn
, 24, 27);
10043 opcode2
= bits (arm_insn_r
->arm_insn
, 4, 7);
10044 insn_op1
= bits (arm_insn_r
->arm_insn
, 20, 23);
10046 /* Handle arithmetic insn extension space. */
10047 if (!opcode1
&& 9 == opcode2
&& 1 != arm_insn_r
->cond
10048 && !INSN_RECORDED(arm_insn_r
))
10050 /* Handle MLA(S) and MUL(S). */
10051 if (0 <= insn_op1
&& 3 >= insn_op1
)
10053 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10054 record_buf
[1] = ARM_PS_REGNUM
;
10055 arm_insn_r
->reg_rec_count
= 2;
10057 else if (4 <= insn_op1
&& 15 >= insn_op1
)
10059 /* Handle SMLAL(S), SMULL(S), UMLAL(S), UMULL(S). */
10060 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 16, 19);
10061 record_buf
[1] = bits (arm_insn_r
->arm_insn
, 12, 15);
10062 record_buf
[2] = ARM_PS_REGNUM
;
10063 arm_insn_r
->reg_rec_count
= 3;
10067 opcode1
= bits (arm_insn_r
->arm_insn
, 26, 27);
10068 opcode2
= bits (arm_insn_r
->arm_insn
, 23, 24);
10069 insn_op1
= bits (arm_insn_r
->arm_insn
, 21, 22);
10071 /* Handle control insn extension space. */
10073 if (!opcode1
&& 2 == opcode2
&& !bit (arm_insn_r
->arm_insn
, 20)
10074 && 1 != arm_insn_r
->cond
&& !INSN_RECORDED(arm_insn_r
))
10076 if (!bit (arm_insn_r
->arm_insn
,25))
10078 if (!bits (arm_insn_r
->arm_insn
, 4, 7))
10080 if ((0 == insn_op1
) || (2 == insn_op1
))
10083 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10084 arm_insn_r
->reg_rec_count
= 1;
10086 else if (1 == insn_op1
)
10088 /* CSPR is going to be changed. */
10089 record_buf
[0] = ARM_PS_REGNUM
;
10090 arm_insn_r
->reg_rec_count
= 1;
10092 else if (3 == insn_op1
)
10094 /* SPSR is going to be changed. */
10095 /* We need to get SPSR value, which is yet to be done. */
10099 else if (1 == bits (arm_insn_r
->arm_insn
, 4, 7))
10104 record_buf
[0] = ARM_PS_REGNUM
;
10105 arm_insn_r
->reg_rec_count
= 1;
10107 else if (3 == insn_op1
)
10110 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10111 arm_insn_r
->reg_rec_count
= 1;
10114 else if (3 == bits (arm_insn_r
->arm_insn
, 4, 7))
10117 record_buf
[0] = ARM_PS_REGNUM
;
10118 record_buf
[1] = ARM_LR_REGNUM
;
10119 arm_insn_r
->reg_rec_count
= 2;
10121 else if (5 == bits (arm_insn_r
->arm_insn
, 4, 7))
10123 /* QADD, QSUB, QDADD, QDSUB */
10124 record_buf
[0] = ARM_PS_REGNUM
;
10125 record_buf
[1] = bits (arm_insn_r
->arm_insn
, 12, 15);
10126 arm_insn_r
->reg_rec_count
= 2;
10128 else if (7 == bits (arm_insn_r
->arm_insn
, 4, 7))
10131 record_buf
[0] = ARM_PS_REGNUM
;
10132 record_buf
[1] = ARM_LR_REGNUM
;
10133 arm_insn_r
->reg_rec_count
= 2;
10135 /* Save SPSR also;how? */
10138 else if(8 == bits (arm_insn_r
->arm_insn
, 4, 7)
10139 || 10 == bits (arm_insn_r
->arm_insn
, 4, 7)
10140 || 12 == bits (arm_insn_r
->arm_insn
, 4, 7)
10141 || 14 == bits (arm_insn_r
->arm_insn
, 4, 7)
10144 if (0 == insn_op1
|| 1 == insn_op1
)
10146 /* SMLA<x><y>, SMLAW<y>, SMULW<y>. */
10147 /* We dont do optimization for SMULW<y> where we
10149 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10150 record_buf
[1] = ARM_PS_REGNUM
;
10151 arm_insn_r
->reg_rec_count
= 2;
10153 else if (2 == insn_op1
)
10156 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10157 record_buf
[1] = bits (arm_insn_r
->arm_insn
, 16, 19);
10158 arm_insn_r
->reg_rec_count
= 2;
10160 else if (3 == insn_op1
)
10163 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10164 arm_insn_r
->reg_rec_count
= 1;
10170 /* MSR : immediate form. */
10173 /* CSPR is going to be changed. */
10174 record_buf
[0] = ARM_PS_REGNUM
;
10175 arm_insn_r
->reg_rec_count
= 1;
10177 else if (3 == insn_op1
)
10179 /* SPSR is going to be changed. */
10180 /* we need to get SPSR value, which is yet to be done */
10186 opcode1
= bits (arm_insn_r
->arm_insn
, 25, 27);
10187 opcode2
= bits (arm_insn_r
->arm_insn
, 20, 24);
10188 insn_op1
= bits (arm_insn_r
->arm_insn
, 5, 6);
10190 /* Handle load/store insn extension space. */
10192 if (!opcode1
&& bit (arm_insn_r
->arm_insn
, 7)
10193 && bit (arm_insn_r
->arm_insn
, 4) && 1 != arm_insn_r
->cond
10194 && !INSN_RECORDED(arm_insn_r
))
10199 /* These insn, changes register and memory as well. */
10200 /* SWP or SWPB insn. */
10201 /* Get memory address given by Rn. */
10202 reg_src1
= bits (arm_insn_r
->arm_insn
, 16, 19);
10203 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
);
10204 /* SWP insn ?, swaps word. */
10205 if (8 == arm_insn_r
->opcode
)
10207 record_buf_mem
[0] = 4;
10211 /* SWPB insn, swaps only byte. */
10212 record_buf_mem
[0] = 1;
10214 record_buf_mem
[1] = u_regval
;
10215 arm_insn_r
->mem_rec_count
= 1;
10216 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10217 arm_insn_r
->reg_rec_count
= 1;
10219 else if (1 == insn_op1
&& !bit (arm_insn_r
->arm_insn
, 20))
10222 arm_record_strx(arm_insn_r
, &record_buf
[0], &record_buf_mem
[0],
10225 else if (2 == insn_op1
&& !bit (arm_insn_r
->arm_insn
, 20))
10228 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10229 record_buf
[1] = record_buf
[0] + 1;
10230 arm_insn_r
->reg_rec_count
= 2;
10232 else if (3 == insn_op1
&& !bit (arm_insn_r
->arm_insn
, 20))
10235 arm_record_strx(arm_insn_r
, &record_buf
[0], &record_buf_mem
[0],
10238 else if (bit (arm_insn_r
->arm_insn
, 20) && insn_op1
<= 3)
10240 /* LDRH, LDRSB, LDRSH. */
10241 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10242 arm_insn_r
->reg_rec_count
= 1;
10247 opcode1
= bits (arm_insn_r
->arm_insn
, 23, 27);
10248 if (24 == opcode1
&& bit (arm_insn_r
->arm_insn
, 21)
10249 && !INSN_RECORDED(arm_insn_r
))
10252 /* Handle coprocessor insn extension space. */
10255 /* To be done for ARMv5 and later; as of now we return -1. */
10259 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
10260 MEM_ALLOC (arm_insn_r
->arm_mems
, arm_insn_r
->mem_rec_count
, record_buf_mem
);
10265 /* Handling opcode 000 insns. */
10268 arm_record_data_proc_misc_ld_str (insn_decode_record
*arm_insn_r
)
10270 struct regcache
*reg_cache
= arm_insn_r
->regcache
;
10271 uint32_t record_buf
[8], record_buf_mem
[8];
10272 ULONGEST u_regval
[2] = {0};
10274 uint32_t reg_src1
= 0, reg_dest
= 0;
10275 uint32_t opcode1
= 0;
10277 arm_insn_r
->opcode
= bits (arm_insn_r
->arm_insn
, 21, 24);
10278 arm_insn_r
->decode
= bits (arm_insn_r
->arm_insn
, 4, 7);
10279 opcode1
= bits (arm_insn_r
->arm_insn
, 20, 24);
10281 /* Data processing insn /multiply insn. */
10282 if (9 == arm_insn_r
->decode
10283 && ((4 <= arm_insn_r
->opcode
&& 7 >= arm_insn_r
->opcode
)
10284 || (0 == arm_insn_r
->opcode
|| 1 == arm_insn_r
->opcode
)))
10286 /* Handle multiply instructions. */
10287 /* MLA, MUL, SMLAL, SMULL, UMLAL, UMULL. */
10288 if (0 == arm_insn_r
->opcode
|| 1 == arm_insn_r
->opcode
)
10290 /* Handle MLA and MUL. */
10291 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 16, 19);
10292 record_buf
[1] = ARM_PS_REGNUM
;
10293 arm_insn_r
->reg_rec_count
= 2;
10295 else if (4 <= arm_insn_r
->opcode
&& 7 >= arm_insn_r
->opcode
)
10297 /* Handle SMLAL, SMULL, UMLAL, UMULL. */
10298 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 16, 19);
10299 record_buf
[1] = bits (arm_insn_r
->arm_insn
, 12, 15);
10300 record_buf
[2] = ARM_PS_REGNUM
;
10301 arm_insn_r
->reg_rec_count
= 3;
10304 else if (bit (arm_insn_r
->arm_insn
, INSN_S_L_BIT_NUM
)
10305 && (11 == arm_insn_r
->decode
|| 13 == arm_insn_r
->decode
))
10307 /* Handle misc load insns, as 20th bit (L = 1). */
10308 /* LDR insn has a capability to do branching, if
10309 MOV LR, PC is precceded by LDR insn having Rn as R15
10310 in that case, it emulates branch and link insn, and hence we
10311 need to save CSPR and PC as well. I am not sure this is right
10312 place; as opcode = 010 LDR insn make this happen, if R15 was
10314 reg_dest
= bits (arm_insn_r
->arm_insn
, 12, 15);
10315 if (15 != reg_dest
)
10317 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10318 arm_insn_r
->reg_rec_count
= 1;
10322 record_buf
[0] = reg_dest
;
10323 record_buf
[1] = ARM_PS_REGNUM
;
10324 arm_insn_r
->reg_rec_count
= 2;
10327 else if ((9 == arm_insn_r
->opcode
|| 11 == arm_insn_r
->opcode
)
10328 && sbo_sbz (arm_insn_r
->arm_insn
, 5, 12, 0)
10329 && sbo_sbz (arm_insn_r
->arm_insn
, 13, 4, 1)
10330 && 2 == bits (arm_insn_r
->arm_insn
, 20, 21))
10332 /* Handle MSR insn. */
10333 if (9 == arm_insn_r
->opcode
)
10335 /* CSPR is going to be changed. */
10336 record_buf
[0] = ARM_PS_REGNUM
;
10337 arm_insn_r
->reg_rec_count
= 1;
10341 /* SPSR is going to be changed. */
10342 /* How to read SPSR value? */
10346 else if (9 == arm_insn_r
->decode
10347 && (8 == arm_insn_r
->opcode
|| 10 == arm_insn_r
->opcode
)
10348 && !bit (arm_insn_r
->arm_insn
, INSN_S_L_BIT_NUM
))
10350 /* Handling SWP, SWPB. */
10351 /* These insn, changes register and memory as well. */
10352 /* SWP or SWPB insn. */
10354 reg_src1
= bits (arm_insn_r
->arm_insn
, 16, 19);
10355 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
[0]);
10356 /* SWP insn ?, swaps word. */
10357 if (8 == arm_insn_r
->opcode
)
10359 record_buf_mem
[0] = 4;
10363 /* SWPB insn, swaps only byte. */
10364 record_buf_mem
[0] = 1;
10366 record_buf_mem
[1] = u_regval
[0];
10367 arm_insn_r
->mem_rec_count
= 1;
10368 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10369 arm_insn_r
->reg_rec_count
= 1;
10371 else if (3 == arm_insn_r
->decode
&& 0x12 == opcode1
10372 && sbo_sbz (arm_insn_r
->arm_insn
, 9, 12, 1))
10374 /* Handle BLX, branch and link/exchange. */
10375 if (9 == arm_insn_r
->opcode
)
10377 /* Branch is chosen by setting T bit of CSPR, bitp[0] of Rm,
10378 and R14 stores the return address. */
10379 record_buf
[0] = ARM_PS_REGNUM
;
10380 record_buf
[1] = ARM_LR_REGNUM
;
10381 arm_insn_r
->reg_rec_count
= 2;
10384 else if (7 == arm_insn_r
->decode
&& 0x12 == opcode1
)
10386 /* Handle enhanced software breakpoint insn, BKPT. */
10387 /* CPSR is changed to be executed in ARM state, disabling normal
10388 interrupts, entering abort mode. */
10389 /* According to high vector configuration PC is set. */
10390 /* user hit breakpoint and type reverse, in
10391 that case, we need to go back with previous CPSR and
10392 Program Counter. */
10393 record_buf
[0] = ARM_PS_REGNUM
;
10394 record_buf
[1] = ARM_LR_REGNUM
;
10395 arm_insn_r
->reg_rec_count
= 2;
10397 /* Save SPSR also; how? */
10400 else if (11 == arm_insn_r
->decode
10401 && !bit (arm_insn_r
->arm_insn
, INSN_S_L_BIT_NUM
))
10403 /* Handle enhanced store insns and DSP insns (e.g. LDRD). */
10405 /* Handle str(x) insn */
10406 arm_record_strx(arm_insn_r
, &record_buf
[0], &record_buf_mem
[0],
10409 else if (1 == arm_insn_r
->decode
&& 0x12 == opcode1
10410 && sbo_sbz (arm_insn_r
->arm_insn
, 9, 12, 1))
10412 /* Handle BX, branch and link/exchange. */
10413 /* Branch is chosen by setting T bit of CSPR, bitp[0] of Rm. */
10414 record_buf
[0] = ARM_PS_REGNUM
;
10415 arm_insn_r
->reg_rec_count
= 1;
10417 else if (1 == arm_insn_r
->decode
&& 0x16 == opcode1
10418 && sbo_sbz (arm_insn_r
->arm_insn
, 9, 4, 1)
10419 && sbo_sbz (arm_insn_r
->arm_insn
, 17, 4, 1))
10421 /* Count leading zeros: CLZ. */
10422 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10423 arm_insn_r
->reg_rec_count
= 1;
10425 else if (!bit (arm_insn_r
->arm_insn
, INSN_S_L_BIT_NUM
)
10426 && (8 == arm_insn_r
->opcode
|| 10 == arm_insn_r
->opcode
)
10427 && sbo_sbz (arm_insn_r
->arm_insn
, 17, 4, 1)
10428 && sbo_sbz (arm_insn_r
->arm_insn
, 1, 12, 0)
10431 /* Handle MRS insn. */
10432 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10433 arm_insn_r
->reg_rec_count
= 1;
10435 else if (arm_insn_r
->opcode
<= 15)
10437 /* Normal data processing insns. */
10438 /* Out of 11 shifter operands mode, all the insn modifies destination
10439 register, which is specified by 13-16 decode. */
10440 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10441 record_buf
[1] = ARM_PS_REGNUM
;
10442 arm_insn_r
->reg_rec_count
= 2;
10449 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
10450 MEM_ALLOC (arm_insn_r
->arm_mems
, arm_insn_r
->mem_rec_count
, record_buf_mem
);
10454 /* Handling opcode 001 insns. */
10457 arm_record_data_proc_imm (insn_decode_record
*arm_insn_r
)
10459 uint32_t record_buf
[8], record_buf_mem
[8];
10461 arm_insn_r
->opcode
= bits (arm_insn_r
->arm_insn
, 21, 24);
10462 arm_insn_r
->decode
= bits (arm_insn_r
->arm_insn
, 4, 7);
10464 if ((9 == arm_insn_r
->opcode
|| 11 == arm_insn_r
->opcode
)
10465 && 2 == bits (arm_insn_r
->arm_insn
, 20, 21)
10466 && sbo_sbz (arm_insn_r
->arm_insn
, 13, 4, 1)
10469 /* Handle MSR insn. */
10470 if (9 == arm_insn_r
->opcode
)
10472 /* CSPR is going to be changed. */
10473 record_buf
[0] = ARM_PS_REGNUM
;
10474 arm_insn_r
->reg_rec_count
= 1;
10478 /* SPSR is going to be changed. */
10481 else if (arm_insn_r
->opcode
<= 15)
10483 /* Normal data processing insns. */
10484 /* Out of 11 shifter operands mode, all the insn modifies destination
10485 register, which is specified by 13-16 decode. */
10486 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10487 record_buf
[1] = ARM_PS_REGNUM
;
10488 arm_insn_r
->reg_rec_count
= 2;
10495 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
10496 MEM_ALLOC (arm_insn_r
->arm_mems
, arm_insn_r
->mem_rec_count
, record_buf_mem
);
10501 arm_record_media (insn_decode_record
*arm_insn_r
)
10503 uint32_t record_buf
[8];
10505 switch (bits (arm_insn_r
->arm_insn
, 22, 24))
10508 /* Parallel addition and subtraction, signed */
10510 /* Parallel addition and subtraction, unsigned */
10513 /* Packing, unpacking, saturation and reversal */
10515 int rd
= bits (arm_insn_r
->arm_insn
, 12, 15);
10517 record_buf
[arm_insn_r
->reg_rec_count
++] = rd
;
10523 /* Signed multiplies */
10525 int rd
= bits (arm_insn_r
->arm_insn
, 16, 19);
10526 unsigned int op1
= bits (arm_insn_r
->arm_insn
, 20, 22);
10528 record_buf
[arm_insn_r
->reg_rec_count
++] = rd
;
10530 record_buf
[arm_insn_r
->reg_rec_count
++] = ARM_PS_REGNUM
;
10531 else if (op1
== 0x4)
10532 record_buf
[arm_insn_r
->reg_rec_count
++]
10533 = bits (arm_insn_r
->arm_insn
, 12, 15);
10539 if (bit (arm_insn_r
->arm_insn
, 21)
10540 && bits (arm_insn_r
->arm_insn
, 5, 6) == 0x2)
10543 record_buf
[arm_insn_r
->reg_rec_count
++]
10544 = bits (arm_insn_r
->arm_insn
, 12, 15);
10546 else if (bits (arm_insn_r
->arm_insn
, 20, 21) == 0x0
10547 && bits (arm_insn_r
->arm_insn
, 5, 7) == 0x0)
10549 /* USAD8 and USADA8 */
10550 record_buf
[arm_insn_r
->reg_rec_count
++]
10551 = bits (arm_insn_r
->arm_insn
, 16, 19);
10558 if (bits (arm_insn_r
->arm_insn
, 20, 21) == 0x3
10559 && bits (arm_insn_r
->arm_insn
, 5, 7) == 0x7)
10561 /* Permanently UNDEFINED */
10566 /* BFC, BFI and UBFX */
10567 record_buf
[arm_insn_r
->reg_rec_count
++]
10568 = bits (arm_insn_r
->arm_insn
, 12, 15);
10577 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
10582 /* Handle ARM mode instructions with opcode 010. */
10585 arm_record_ld_st_imm_offset (insn_decode_record
*arm_insn_r
)
10587 struct regcache
*reg_cache
= arm_insn_r
->regcache
;
10589 uint32_t reg_base
, reg_dest
;
10590 uint32_t offset_12
, tgt_mem_addr
;
10591 uint32_t record_buf
[8], record_buf_mem
[8];
10592 unsigned char wback
;
10595 /* Calculate wback. */
10596 wback
= (bit (arm_insn_r
->arm_insn
, 24) == 0)
10597 || (bit (arm_insn_r
->arm_insn
, 21) == 1);
10599 arm_insn_r
->reg_rec_count
= 0;
10600 reg_base
= bits (arm_insn_r
->arm_insn
, 16, 19);
10602 if (bit (arm_insn_r
->arm_insn
, INSN_S_L_BIT_NUM
))
10604 /* LDR (immediate), LDR (literal), LDRB (immediate), LDRB (literal), LDRBT
10607 reg_dest
= bits (arm_insn_r
->arm_insn
, 12, 15);
10608 record_buf
[arm_insn_r
->reg_rec_count
++] = reg_dest
;
10610 /* The LDR instruction is capable of doing branching. If MOV LR, PC
10611 preceeds a LDR instruction having R15 as reg_base, it
10612 emulates a branch and link instruction, and hence we need to save
10613 CPSR and PC as well. */
10614 if (ARM_PC_REGNUM
== reg_dest
)
10615 record_buf
[arm_insn_r
->reg_rec_count
++] = ARM_PS_REGNUM
;
10617 /* If wback is true, also save the base register, which is going to be
10620 record_buf
[arm_insn_r
->reg_rec_count
++] = reg_base
;
10624 /* STR (immediate), STRB (immediate), STRBT and STRT. */
10626 offset_12
= bits (arm_insn_r
->arm_insn
, 0, 11);
10627 regcache_raw_read_unsigned (reg_cache
, reg_base
, &u_regval
);
10629 /* Handle bit U. */
10630 if (bit (arm_insn_r
->arm_insn
, 23))
10632 /* U == 1: Add the offset. */
10633 tgt_mem_addr
= (uint32_t) u_regval
+ offset_12
;
10637 /* U == 0: subtract the offset. */
10638 tgt_mem_addr
= (uint32_t) u_regval
- offset_12
;
10641 /* Bit 22 tells us whether the store instruction writes 1 byte or 4
10643 if (bit (arm_insn_r
->arm_insn
, 22))
10645 /* STRB and STRBT: 1 byte. */
10646 record_buf_mem
[0] = 1;
10650 /* STR and STRT: 4 bytes. */
10651 record_buf_mem
[0] = 4;
10654 /* Handle bit P. */
10655 if (bit (arm_insn_r
->arm_insn
, 24))
10656 record_buf_mem
[1] = tgt_mem_addr
;
10658 record_buf_mem
[1] = (uint32_t) u_regval
;
10660 arm_insn_r
->mem_rec_count
= 1;
10662 /* If wback is true, also save the base register, which is going to be
10665 record_buf
[arm_insn_r
->reg_rec_count
++] = reg_base
;
10668 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
10669 MEM_ALLOC (arm_insn_r
->arm_mems
, arm_insn_r
->mem_rec_count
, record_buf_mem
);
10673 /* Handling opcode 011 insns. */
10676 arm_record_ld_st_reg_offset (insn_decode_record
*arm_insn_r
)
10678 struct regcache
*reg_cache
= arm_insn_r
->regcache
;
10680 uint32_t shift_imm
= 0;
10681 uint32_t reg_src1
= 0, reg_src2
= 0, reg_dest
= 0;
10682 uint32_t offset_12
= 0, tgt_mem_addr
= 0;
10683 uint32_t record_buf
[8], record_buf_mem
[8];
10686 ULONGEST u_regval
[2];
10688 if (bit (arm_insn_r
->arm_insn
, 4))
10689 return arm_record_media (arm_insn_r
);
10691 arm_insn_r
->opcode
= bits (arm_insn_r
->arm_insn
, 21, 24);
10692 arm_insn_r
->decode
= bits (arm_insn_r
->arm_insn
, 4, 7);
10694 /* Handle enhanced store insns and LDRD DSP insn,
10695 order begins according to addressing modes for store insns
10699 if (bit (arm_insn_r
->arm_insn
, INSN_S_L_BIT_NUM
))
10701 reg_dest
= bits (arm_insn_r
->arm_insn
, 12, 15);
10702 /* LDR insn has a capability to do branching, if
10703 MOV LR, PC is precedded by LDR insn having Rn as R15
10704 in that case, it emulates branch and link insn, and hence we
10705 need to save CSPR and PC as well. */
10706 if (15 != reg_dest
)
10708 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10709 arm_insn_r
->reg_rec_count
= 1;
10713 record_buf
[0] = reg_dest
;
10714 record_buf
[1] = ARM_PS_REGNUM
;
10715 arm_insn_r
->reg_rec_count
= 2;
10720 if (! bits (arm_insn_r
->arm_insn
, 4, 11))
10722 /* Store insn, register offset and register pre-indexed,
10723 register post-indexed. */
10725 reg_src1
= bits (arm_insn_r
->arm_insn
, 0, 3);
10727 reg_src2
= bits (arm_insn_r
->arm_insn
, 16, 19);
10728 regcache_raw_read_unsigned (reg_cache
, reg_src1
10730 regcache_raw_read_unsigned (reg_cache
, reg_src2
10732 if (15 == reg_src2
)
10734 /* If R15 was used as Rn, hence current PC+8. */
10735 /* Pre-indexed mode doesnt reach here ; illegal insn. */
10736 u_regval
[0] = u_regval
[0] + 8;
10738 /* Calculate target store address, Rn +/- Rm, register offset. */
10740 if (bit (arm_insn_r
->arm_insn
, 23))
10742 tgt_mem_addr
= u_regval
[0] + u_regval
[1];
10746 tgt_mem_addr
= u_regval
[1] - u_regval
[0];
10749 switch (arm_insn_r
->opcode
)
10763 record_buf_mem
[0] = 4;
10778 record_buf_mem
[0] = 1;
10782 gdb_assert_not_reached ("no decoding pattern found");
10785 record_buf_mem
[1] = tgt_mem_addr
;
10786 arm_insn_r
->mem_rec_count
= 1;
10788 if (9 == arm_insn_r
->opcode
|| 11 == arm_insn_r
->opcode
10789 || 13 == arm_insn_r
->opcode
|| 15 == arm_insn_r
->opcode
10790 || 0 == arm_insn_r
->opcode
|| 2 == arm_insn_r
->opcode
10791 || 4 == arm_insn_r
->opcode
|| 6 == arm_insn_r
->opcode
10792 || 1 == arm_insn_r
->opcode
|| 3 == arm_insn_r
->opcode
10793 || 5 == arm_insn_r
->opcode
|| 7 == arm_insn_r
->opcode
10796 /* Rn is going to be changed in pre-indexed mode and
10797 post-indexed mode as well. */
10798 record_buf
[0] = reg_src2
;
10799 arm_insn_r
->reg_rec_count
= 1;
10804 /* Store insn, scaled register offset; scaled pre-indexed. */
10805 offset_12
= bits (arm_insn_r
->arm_insn
, 5, 6);
10807 reg_src1
= bits (arm_insn_r
->arm_insn
, 0, 3);
10809 reg_src2
= bits (arm_insn_r
->arm_insn
, 16, 19);
10810 /* Get shift_imm. */
10811 shift_imm
= bits (arm_insn_r
->arm_insn
, 7, 11);
10812 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
[0]);
10813 regcache_raw_read_signed (reg_cache
, reg_src1
, &s_word
);
10814 regcache_raw_read_unsigned (reg_cache
, reg_src2
, &u_regval
[1]);
10815 /* Offset_12 used as shift. */
10819 /* Offset_12 used as index. */
10820 offset_12
= u_regval
[0] << shift_imm
;
10824 offset_12
= (!shift_imm
)?0:u_regval
[0] >> shift_imm
;
10830 if (bit (u_regval
[0], 31))
10832 offset_12
= 0xFFFFFFFF;
10841 /* This is arithmetic shift. */
10842 offset_12
= s_word
>> shift_imm
;
10849 regcache_raw_read_unsigned (reg_cache
, ARM_PS_REGNUM
,
10851 /* Get C flag value and shift it by 31. */
10852 offset_12
= (((bit (u_regval
[1], 29)) << 31) \
10853 | (u_regval
[0]) >> 1);
10857 offset_12
= (u_regval
[0] >> shift_imm
) \
10859 (sizeof(uint32_t) - shift_imm
));
10864 gdb_assert_not_reached ("no decoding pattern found");
10868 regcache_raw_read_unsigned (reg_cache
, reg_src2
, &u_regval
[1]);
10870 if (bit (arm_insn_r
->arm_insn
, 23))
10872 tgt_mem_addr
= u_regval
[1] + offset_12
;
10876 tgt_mem_addr
= u_regval
[1] - offset_12
;
10879 switch (arm_insn_r
->opcode
)
10893 record_buf_mem
[0] = 4;
10908 record_buf_mem
[0] = 1;
10912 gdb_assert_not_reached ("no decoding pattern found");
10915 record_buf_mem
[1] = tgt_mem_addr
;
10916 arm_insn_r
->mem_rec_count
= 1;
10918 if (9 == arm_insn_r
->opcode
|| 11 == arm_insn_r
->opcode
10919 || 13 == arm_insn_r
->opcode
|| 15 == arm_insn_r
->opcode
10920 || 0 == arm_insn_r
->opcode
|| 2 == arm_insn_r
->opcode
10921 || 4 == arm_insn_r
->opcode
|| 6 == arm_insn_r
->opcode
10922 || 1 == arm_insn_r
->opcode
|| 3 == arm_insn_r
->opcode
10923 || 5 == arm_insn_r
->opcode
|| 7 == arm_insn_r
->opcode
10926 /* Rn is going to be changed in register scaled pre-indexed
10927 mode,and scaled post indexed mode. */
10928 record_buf
[0] = reg_src2
;
10929 arm_insn_r
->reg_rec_count
= 1;
10934 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
10935 MEM_ALLOC (arm_insn_r
->arm_mems
, arm_insn_r
->mem_rec_count
, record_buf_mem
);
10939 /* Handle ARM mode instructions with opcode 100. */
10942 arm_record_ld_st_multiple (insn_decode_record
*arm_insn_r
)
10944 struct regcache
*reg_cache
= arm_insn_r
->regcache
;
10945 uint32_t register_count
= 0, register_bits
;
10946 uint32_t reg_base
, addr_mode
;
10947 uint32_t record_buf
[24], record_buf_mem
[48];
10951 /* Fetch the list of registers. */
10952 register_bits
= bits (arm_insn_r
->arm_insn
, 0, 15);
10953 arm_insn_r
->reg_rec_count
= 0;
10955 /* Fetch the base register that contains the address we are loading data
10957 reg_base
= bits (arm_insn_r
->arm_insn
, 16, 19);
10959 /* Calculate wback. */
10960 wback
= (bit (arm_insn_r
->arm_insn
, 21) == 1);
10962 if (bit (arm_insn_r
->arm_insn
, INSN_S_L_BIT_NUM
))
10964 /* LDM/LDMIA/LDMFD, LDMDA/LDMFA, LDMDB and LDMIB. */
10966 /* Find out which registers are going to be loaded from memory. */
10967 while (register_bits
)
10969 if (register_bits
& 0x00000001)
10970 record_buf
[arm_insn_r
->reg_rec_count
++] = register_count
;
10971 register_bits
= register_bits
>> 1;
10976 /* If wback is true, also save the base register, which is going to be
10979 record_buf
[arm_insn_r
->reg_rec_count
++] = reg_base
;
10981 /* Save the CPSR register. */
10982 record_buf
[arm_insn_r
->reg_rec_count
++] = ARM_PS_REGNUM
;
10986 /* STM (STMIA, STMEA), STMDA (STMED), STMDB (STMFD) and STMIB (STMFA). */
10988 addr_mode
= bits (arm_insn_r
->arm_insn
, 23, 24);
10990 regcache_raw_read_unsigned (reg_cache
, reg_base
, &u_regval
);
10992 /* Find out how many registers are going to be stored to memory. */
10993 while (register_bits
)
10995 if (register_bits
& 0x00000001)
10997 register_bits
= register_bits
>> 1;
11002 /* STMDA (STMED): Decrement after. */
11004 record_buf_mem
[1] = (uint32_t) u_regval
11005 - register_count
* INT_REGISTER_SIZE
+ 4;
11007 /* STM (STMIA, STMEA): Increment after. */
11009 record_buf_mem
[1] = (uint32_t) u_regval
;
11011 /* STMDB (STMFD): Decrement before. */
11013 record_buf_mem
[1] = (uint32_t) u_regval
11014 - register_count
* INT_REGISTER_SIZE
;
11016 /* STMIB (STMFA): Increment before. */
11018 record_buf_mem
[1] = (uint32_t) u_regval
+ INT_REGISTER_SIZE
;
11021 gdb_assert_not_reached ("no decoding pattern found");
11025 record_buf_mem
[0] = register_count
* INT_REGISTER_SIZE
;
11026 arm_insn_r
->mem_rec_count
= 1;
11028 /* If wback is true, also save the base register, which is going to be
11031 record_buf
[arm_insn_r
->reg_rec_count
++] = reg_base
;
11034 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
11035 MEM_ALLOC (arm_insn_r
->arm_mems
, arm_insn_r
->mem_rec_count
, record_buf_mem
);
11039 /* Handling opcode 101 insns. */
11042 arm_record_b_bl (insn_decode_record
*arm_insn_r
)
11044 uint32_t record_buf
[8];
11046 /* Handle B, BL, BLX(1) insns. */
11047 /* B simply branches so we do nothing here. */
11048 /* Note: BLX(1) doesnt fall here but instead it falls into
11049 extension space. */
11050 if (bit (arm_insn_r
->arm_insn
, 24))
11052 record_buf
[0] = ARM_LR_REGNUM
;
11053 arm_insn_r
->reg_rec_count
= 1;
11056 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
11062 arm_record_unsupported_insn (insn_decode_record
*arm_insn_r
)
11064 printf_unfiltered (_("Process record does not support instruction "
11065 "0x%0x at address %s.\n"),arm_insn_r
->arm_insn
,
11066 paddress (arm_insn_r
->gdbarch
, arm_insn_r
->this_addr
));
11071 /* Record handler for vector data transfer instructions. */
11074 arm_record_vdata_transfer_insn (insn_decode_record
*arm_insn_r
)
11076 uint32_t bits_a
, bit_c
, bit_l
, reg_t
, reg_v
;
11077 uint32_t record_buf
[4];
11079 reg_t
= bits (arm_insn_r
->arm_insn
, 12, 15);
11080 reg_v
= bits (arm_insn_r
->arm_insn
, 21, 23);
11081 bits_a
= bits (arm_insn_r
->arm_insn
, 21, 23);
11082 bit_l
= bit (arm_insn_r
->arm_insn
, 20);
11083 bit_c
= bit (arm_insn_r
->arm_insn
, 8);
11085 /* Handle VMOV instruction. */
11086 if (bit_l
&& bit_c
)
11088 record_buf
[0] = reg_t
;
11089 arm_insn_r
->reg_rec_count
= 1;
11091 else if (bit_l
&& !bit_c
)
11093 /* Handle VMOV instruction. */
11094 if (bits_a
== 0x00)
11096 record_buf
[0] = reg_t
;
11097 arm_insn_r
->reg_rec_count
= 1;
11099 /* Handle VMRS instruction. */
11100 else if (bits_a
== 0x07)
11103 reg_t
= ARM_PS_REGNUM
;
11105 record_buf
[0] = reg_t
;
11106 arm_insn_r
->reg_rec_count
= 1;
11109 else if (!bit_l
&& !bit_c
)
11111 /* Handle VMOV instruction. */
11112 if (bits_a
== 0x00)
11114 record_buf
[0] = ARM_D0_REGNUM
+ reg_v
;
11116 arm_insn_r
->reg_rec_count
= 1;
11118 /* Handle VMSR instruction. */
11119 else if (bits_a
== 0x07)
11121 record_buf
[0] = ARM_FPSCR_REGNUM
;
11122 arm_insn_r
->reg_rec_count
= 1;
11125 else if (!bit_l
&& bit_c
)
11127 /* Handle VMOV instruction. */
11128 if (!(bits_a
& 0x04))
11130 record_buf
[0] = (reg_v
| (bit (arm_insn_r
->arm_insn
, 7) << 4))
11132 arm_insn_r
->reg_rec_count
= 1;
11134 /* Handle VDUP instruction. */
11137 if (bit (arm_insn_r
->arm_insn
, 21))
11139 reg_v
= reg_v
| (bit (arm_insn_r
->arm_insn
, 7) << 4);
11140 record_buf
[0] = reg_v
+ ARM_D0_REGNUM
;
11141 record_buf
[1] = reg_v
+ ARM_D0_REGNUM
+ 1;
11142 arm_insn_r
->reg_rec_count
= 2;
11146 reg_v
= reg_v
| (bit (arm_insn_r
->arm_insn
, 7) << 4);
11147 record_buf
[0] = reg_v
+ ARM_D0_REGNUM
;
11148 arm_insn_r
->reg_rec_count
= 1;
11153 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
11157 /* Record handler for extension register load/store instructions. */
11160 arm_record_exreg_ld_st_insn (insn_decode_record
*arm_insn_r
)
11162 uint32_t opcode
, single_reg
;
11163 uint8_t op_vldm_vstm
;
11164 uint32_t record_buf
[8], record_buf_mem
[128];
11165 ULONGEST u_regval
= 0;
11167 struct regcache
*reg_cache
= arm_insn_r
->regcache
;
11169 opcode
= bits (arm_insn_r
->arm_insn
, 20, 24);
11170 single_reg
= !bit (arm_insn_r
->arm_insn
, 8);
11171 op_vldm_vstm
= opcode
& 0x1b;
11173 /* Handle VMOV instructions. */
11174 if ((opcode
& 0x1e) == 0x04)
11176 if (bit (arm_insn_r
->arm_insn
, 20)) /* to_arm_registers bit 20? */
11178 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
11179 record_buf
[1] = bits (arm_insn_r
->arm_insn
, 16, 19);
11180 arm_insn_r
->reg_rec_count
= 2;
11184 uint8_t reg_m
= bits (arm_insn_r
->arm_insn
, 0, 3);
11185 uint8_t bit_m
= bit (arm_insn_r
->arm_insn
, 5);
11189 /* The first S register number m is REG_M:M (M is bit 5),
11190 the corresponding D register number is REG_M:M / 2, which
11192 record_buf
[arm_insn_r
->reg_rec_count
++] = ARM_D0_REGNUM
+ reg_m
;
11193 /* The second S register number is REG_M:M + 1, the
11194 corresponding D register number is (REG_M:M + 1) / 2.
11195 IOW, if bit M is 1, the first and second S registers
11196 are mapped to different D registers, otherwise, they are
11197 in the same D register. */
11200 record_buf
[arm_insn_r
->reg_rec_count
++]
11201 = ARM_D0_REGNUM
+ reg_m
+ 1;
11206 record_buf
[0] = ((bit_m
<< 4) + reg_m
+ ARM_D0_REGNUM
);
11207 arm_insn_r
->reg_rec_count
= 1;
11211 /* Handle VSTM and VPUSH instructions. */
11212 else if (op_vldm_vstm
== 0x08 || op_vldm_vstm
== 0x0a
11213 || op_vldm_vstm
== 0x12)
11215 uint32_t start_address
, reg_rn
, imm_off32
, imm_off8
, memory_count
;
11216 uint32_t memory_index
= 0;
11218 reg_rn
= bits (arm_insn_r
->arm_insn
, 16, 19);
11219 regcache_raw_read_unsigned (reg_cache
, reg_rn
, &u_regval
);
11220 imm_off8
= bits (arm_insn_r
->arm_insn
, 0, 7);
11221 imm_off32
= imm_off8
<< 2;
11222 memory_count
= imm_off8
;
11224 if (bit (arm_insn_r
->arm_insn
, 23))
11225 start_address
= u_regval
;
11227 start_address
= u_regval
- imm_off32
;
11229 if (bit (arm_insn_r
->arm_insn
, 21))
11231 record_buf
[0] = reg_rn
;
11232 arm_insn_r
->reg_rec_count
= 1;
11235 while (memory_count
> 0)
11239 record_buf_mem
[memory_index
] = 4;
11240 record_buf_mem
[memory_index
+ 1] = start_address
;
11241 start_address
= start_address
+ 4;
11242 memory_index
= memory_index
+ 2;
11246 record_buf_mem
[memory_index
] = 4;
11247 record_buf_mem
[memory_index
+ 1] = start_address
;
11248 record_buf_mem
[memory_index
+ 2] = 4;
11249 record_buf_mem
[memory_index
+ 3] = start_address
+ 4;
11250 start_address
= start_address
+ 8;
11251 memory_index
= memory_index
+ 4;
11255 arm_insn_r
->mem_rec_count
= (memory_index
>> 1);
11257 /* Handle VLDM instructions. */
11258 else if (op_vldm_vstm
== 0x09 || op_vldm_vstm
== 0x0b
11259 || op_vldm_vstm
== 0x13)
11261 uint32_t reg_count
, reg_vd
;
11262 uint32_t reg_index
= 0;
11263 uint32_t bit_d
= bit (arm_insn_r
->arm_insn
, 22);
11265 reg_vd
= bits (arm_insn_r
->arm_insn
, 12, 15);
11266 reg_count
= bits (arm_insn_r
->arm_insn
, 0, 7);
11268 /* REG_VD is the first D register number. If the instruction
11269 loads memory to S registers (SINGLE_REG is TRUE), the register
11270 number is (REG_VD << 1 | bit D), so the corresponding D
11271 register number is (REG_VD << 1 | bit D) / 2 = REG_VD. */
11273 reg_vd
= reg_vd
| (bit_d
<< 4);
11275 if (bit (arm_insn_r
->arm_insn
, 21) /* write back */)
11276 record_buf
[reg_index
++] = bits (arm_insn_r
->arm_insn
, 16, 19);
11278 /* If the instruction loads memory to D register, REG_COUNT should
11279 be divided by 2, according to the ARM Architecture Reference
11280 Manual. If the instruction loads memory to S register, divide by
11281 2 as well because two S registers are mapped to D register. */
11282 reg_count
= reg_count
/ 2;
11283 if (single_reg
&& bit_d
)
11285 /* Increase the register count if S register list starts from
11286 an odd number (bit d is one). */
11290 while (reg_count
> 0)
11292 record_buf
[reg_index
++] = ARM_D0_REGNUM
+ reg_vd
+ reg_count
- 1;
11295 arm_insn_r
->reg_rec_count
= reg_index
;
11297 /* VSTR Vector store register. */
11298 else if ((opcode
& 0x13) == 0x10)
11300 uint32_t start_address
, reg_rn
, imm_off32
, imm_off8
;
11301 uint32_t memory_index
= 0;
11303 reg_rn
= bits (arm_insn_r
->arm_insn
, 16, 19);
11304 regcache_raw_read_unsigned (reg_cache
, reg_rn
, &u_regval
);
11305 imm_off8
= bits (arm_insn_r
->arm_insn
, 0, 7);
11306 imm_off32
= imm_off8
<< 2;
11308 if (bit (arm_insn_r
->arm_insn
, 23))
11309 start_address
= u_regval
+ imm_off32
;
11311 start_address
= u_regval
- imm_off32
;
11315 record_buf_mem
[memory_index
] = 4;
11316 record_buf_mem
[memory_index
+ 1] = start_address
;
11317 arm_insn_r
->mem_rec_count
= 1;
11321 record_buf_mem
[memory_index
] = 4;
11322 record_buf_mem
[memory_index
+ 1] = start_address
;
11323 record_buf_mem
[memory_index
+ 2] = 4;
11324 record_buf_mem
[memory_index
+ 3] = start_address
+ 4;
11325 arm_insn_r
->mem_rec_count
= 2;
11328 /* VLDR Vector load register. */
11329 else if ((opcode
& 0x13) == 0x11)
11331 uint32_t reg_vd
= bits (arm_insn_r
->arm_insn
, 12, 15);
11335 reg_vd
= reg_vd
| (bit (arm_insn_r
->arm_insn
, 22) << 4);
11336 record_buf
[0] = ARM_D0_REGNUM
+ reg_vd
;
11340 reg_vd
= (reg_vd
<< 1) | bit (arm_insn_r
->arm_insn
, 22);
11341 /* Record register D rather than pseudo register S. */
11342 record_buf
[0] = ARM_D0_REGNUM
+ reg_vd
/ 2;
11344 arm_insn_r
->reg_rec_count
= 1;
11347 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
11348 MEM_ALLOC (arm_insn_r
->arm_mems
, arm_insn_r
->mem_rec_count
, record_buf_mem
);
11352 /* Record handler for arm/thumb mode VFP data processing instructions. */
11355 arm_record_vfp_data_proc_insn (insn_decode_record
*arm_insn_r
)
11357 uint32_t opc1
, opc2
, opc3
, dp_op_sz
, bit_d
, reg_vd
;
11358 uint32_t record_buf
[4];
11359 enum insn_types
{INSN_T0
, INSN_T1
, INSN_T2
, INSN_T3
, INSN_INV
};
11360 enum insn_types curr_insn_type
= INSN_INV
;
11362 reg_vd
= bits (arm_insn_r
->arm_insn
, 12, 15);
11363 opc1
= bits (arm_insn_r
->arm_insn
, 20, 23);
11364 opc2
= bits (arm_insn_r
->arm_insn
, 16, 19);
11365 opc3
= bits (arm_insn_r
->arm_insn
, 6, 7);
11366 dp_op_sz
= bit (arm_insn_r
->arm_insn
, 8);
11367 bit_d
= bit (arm_insn_r
->arm_insn
, 22);
11368 opc1
= opc1
& 0x04;
11370 /* Handle VMLA, VMLS. */
11373 if (bit (arm_insn_r
->arm_insn
, 10))
11375 if (bit (arm_insn_r
->arm_insn
, 6))
11376 curr_insn_type
= INSN_T0
;
11378 curr_insn_type
= INSN_T1
;
11383 curr_insn_type
= INSN_T1
;
11385 curr_insn_type
= INSN_T2
;
11388 /* Handle VNMLA, VNMLS, VNMUL. */
11389 else if (opc1
== 0x01)
11392 curr_insn_type
= INSN_T1
;
11394 curr_insn_type
= INSN_T2
;
11397 else if (opc1
== 0x02 && !(opc3
& 0x01))
11399 if (bit (arm_insn_r
->arm_insn
, 10))
11401 if (bit (arm_insn_r
->arm_insn
, 6))
11402 curr_insn_type
= INSN_T0
;
11404 curr_insn_type
= INSN_T1
;
11409 curr_insn_type
= INSN_T1
;
11411 curr_insn_type
= INSN_T2
;
11414 /* Handle VADD, VSUB. */
11415 else if (opc1
== 0x03)
11417 if (!bit (arm_insn_r
->arm_insn
, 9))
11419 if (bit (arm_insn_r
->arm_insn
, 6))
11420 curr_insn_type
= INSN_T0
;
11422 curr_insn_type
= INSN_T1
;
11427 curr_insn_type
= INSN_T1
;
11429 curr_insn_type
= INSN_T2
;
11433 else if (opc1
== 0x0b)
11436 curr_insn_type
= INSN_T1
;
11438 curr_insn_type
= INSN_T2
;
11440 /* Handle all other vfp data processing instructions. */
11441 else if (opc1
== 0x0b)
11444 if (!(opc3
& 0x01) || (opc2
== 0x00 && opc3
== 0x01))
11446 if (bit (arm_insn_r
->arm_insn
, 4))
11448 if (bit (arm_insn_r
->arm_insn
, 6))
11449 curr_insn_type
= INSN_T0
;
11451 curr_insn_type
= INSN_T1
;
11456 curr_insn_type
= INSN_T1
;
11458 curr_insn_type
= INSN_T2
;
11461 /* Handle VNEG and VABS. */
11462 else if ((opc2
== 0x01 && opc3
== 0x01)
11463 || (opc2
== 0x00 && opc3
== 0x03))
11465 if (!bit (arm_insn_r
->arm_insn
, 11))
11467 if (bit (arm_insn_r
->arm_insn
, 6))
11468 curr_insn_type
= INSN_T0
;
11470 curr_insn_type
= INSN_T1
;
11475 curr_insn_type
= INSN_T1
;
11477 curr_insn_type
= INSN_T2
;
11480 /* Handle VSQRT. */
11481 else if (opc2
== 0x01 && opc3
== 0x03)
11484 curr_insn_type
= INSN_T1
;
11486 curr_insn_type
= INSN_T2
;
11489 else if (opc2
== 0x07 && opc3
== 0x03)
11492 curr_insn_type
= INSN_T1
;
11494 curr_insn_type
= INSN_T2
;
11496 else if (opc3
& 0x01)
11499 if ((opc2
== 0x08) || (opc2
& 0x0e) == 0x0c)
11501 if (!bit (arm_insn_r
->arm_insn
, 18))
11502 curr_insn_type
= INSN_T2
;
11506 curr_insn_type
= INSN_T1
;
11508 curr_insn_type
= INSN_T2
;
11512 else if ((opc2
& 0x0e) == 0x0a || (opc2
& 0x0e) == 0x0e)
11515 curr_insn_type
= INSN_T1
;
11517 curr_insn_type
= INSN_T2
;
11519 /* Handle VCVTB, VCVTT. */
11520 else if ((opc2
& 0x0e) == 0x02)
11521 curr_insn_type
= INSN_T2
;
11522 /* Handle VCMP, VCMPE. */
11523 else if ((opc2
& 0x0e) == 0x04)
11524 curr_insn_type
= INSN_T3
;
11528 switch (curr_insn_type
)
11531 reg_vd
= reg_vd
| (bit_d
<< 4);
11532 record_buf
[0] = reg_vd
+ ARM_D0_REGNUM
;
11533 record_buf
[1] = reg_vd
+ ARM_D0_REGNUM
+ 1;
11534 arm_insn_r
->reg_rec_count
= 2;
11538 reg_vd
= reg_vd
| (bit_d
<< 4);
11539 record_buf
[0] = reg_vd
+ ARM_D0_REGNUM
;
11540 arm_insn_r
->reg_rec_count
= 1;
11544 reg_vd
= (reg_vd
<< 1) | bit_d
;
11545 record_buf
[0] = reg_vd
+ ARM_D0_REGNUM
;
11546 arm_insn_r
->reg_rec_count
= 1;
11550 record_buf
[0] = ARM_FPSCR_REGNUM
;
11551 arm_insn_r
->reg_rec_count
= 1;
11555 gdb_assert_not_reached ("no decoding pattern found");
11559 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
11563 /* Handling opcode 110 insns. */
11566 arm_record_asimd_vfp_coproc (insn_decode_record
*arm_insn_r
)
11568 uint32_t op1
, op1_ebit
, coproc
;
11570 coproc
= bits (arm_insn_r
->arm_insn
, 8, 11);
11571 op1
= bits (arm_insn_r
->arm_insn
, 20, 25);
11572 op1_ebit
= bit (arm_insn_r
->arm_insn
, 20);
11574 if ((coproc
& 0x0e) == 0x0a)
11576 /* Handle extension register ld/st instructions. */
11578 return arm_record_exreg_ld_st_insn (arm_insn_r
);
11580 /* 64-bit transfers between arm core and extension registers. */
11581 if ((op1
& 0x3e) == 0x04)
11582 return arm_record_exreg_ld_st_insn (arm_insn_r
);
11586 /* Handle coprocessor ld/st instructions. */
11591 return arm_record_unsupported_insn (arm_insn_r
);
11594 return arm_record_unsupported_insn (arm_insn_r
);
11597 /* Move to coprocessor from two arm core registers. */
11599 return arm_record_unsupported_insn (arm_insn_r
);
11601 /* Move to two arm core registers from coprocessor. */
11606 reg_t
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
11607 reg_t
[1] = bits (arm_insn_r
->arm_insn
, 16, 19);
11608 arm_insn_r
->reg_rec_count
= 2;
11610 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, reg_t
);
11614 return arm_record_unsupported_insn (arm_insn_r
);
11617 /* Handling opcode 111 insns. */
11620 arm_record_coproc_data_proc (insn_decode_record
*arm_insn_r
)
11622 uint32_t op
, op1_sbit
, op1_ebit
, coproc
;
11623 struct gdbarch_tdep
*tdep
= gdbarch_tdep (arm_insn_r
->gdbarch
);
11624 struct regcache
*reg_cache
= arm_insn_r
->regcache
;
11626 arm_insn_r
->opcode
= bits (arm_insn_r
->arm_insn
, 24, 27);
11627 coproc
= bits (arm_insn_r
->arm_insn
, 8, 11);
11628 op1_sbit
= bit (arm_insn_r
->arm_insn
, 24);
11629 op1_ebit
= bit (arm_insn_r
->arm_insn
, 20);
11630 op
= bit (arm_insn_r
->arm_insn
, 4);
11632 /* Handle arm SWI/SVC system call instructions. */
11635 if (tdep
->arm_syscall_record
!= NULL
)
11637 ULONGEST svc_operand
, svc_number
;
11639 svc_operand
= (0x00ffffff & arm_insn_r
->arm_insn
);
11641 if (svc_operand
) /* OABI. */
11642 svc_number
= svc_operand
- 0x900000;
11644 regcache_raw_read_unsigned (reg_cache
, 7, &svc_number
);
11646 return tdep
->arm_syscall_record (reg_cache
, svc_number
);
11650 printf_unfiltered (_("no syscall record support\n"));
11655 if ((coproc
& 0x0e) == 0x0a)
11657 /* VFP data-processing instructions. */
11658 if (!op1_sbit
&& !op
)
11659 return arm_record_vfp_data_proc_insn (arm_insn_r
);
11661 /* Advanced SIMD, VFP instructions. */
11662 if (!op1_sbit
&& op
)
11663 return arm_record_vdata_transfer_insn (arm_insn_r
);
11667 /* Coprocessor data operations. */
11668 if (!op1_sbit
&& !op
)
11669 return arm_record_unsupported_insn (arm_insn_r
);
11671 /* Move to Coprocessor from ARM core register. */
11672 if (!op1_sbit
&& !op1_ebit
&& op
)
11673 return arm_record_unsupported_insn (arm_insn_r
);
11675 /* Move to arm core register from coprocessor. */
11676 if (!op1_sbit
&& op1_ebit
&& op
)
11678 uint32_t record_buf
[1];
11680 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
11681 if (record_buf
[0] == 15)
11682 record_buf
[0] = ARM_PS_REGNUM
;
11684 arm_insn_r
->reg_rec_count
= 1;
11685 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
,
11691 return arm_record_unsupported_insn (arm_insn_r
);
11694 /* Handling opcode 000 insns. */
11697 thumb_record_shift_add_sub (insn_decode_record
*thumb_insn_r
)
11699 uint32_t record_buf
[8];
11700 uint32_t reg_src1
= 0;
11702 reg_src1
= bits (thumb_insn_r
->arm_insn
, 0, 2);
11704 record_buf
[0] = ARM_PS_REGNUM
;
11705 record_buf
[1] = reg_src1
;
11706 thumb_insn_r
->reg_rec_count
= 2;
11708 REG_ALLOC (thumb_insn_r
->arm_regs
, thumb_insn_r
->reg_rec_count
, record_buf
);
11714 /* Handling opcode 001 insns. */
11717 thumb_record_add_sub_cmp_mov (insn_decode_record
*thumb_insn_r
)
11719 uint32_t record_buf
[8];
11720 uint32_t reg_src1
= 0;
11722 reg_src1
= bits (thumb_insn_r
->arm_insn
, 8, 10);
11724 record_buf
[0] = ARM_PS_REGNUM
;
11725 record_buf
[1] = reg_src1
;
11726 thumb_insn_r
->reg_rec_count
= 2;
11728 REG_ALLOC (thumb_insn_r
->arm_regs
, thumb_insn_r
->reg_rec_count
, record_buf
);
11733 /* Handling opcode 010 insns. */
11736 thumb_record_ld_st_reg_offset (insn_decode_record
*thumb_insn_r
)
11738 struct regcache
*reg_cache
= thumb_insn_r
->regcache
;
11739 uint32_t record_buf
[8], record_buf_mem
[8];
11741 uint32_t reg_src1
= 0, reg_src2
= 0;
11742 uint32_t opcode1
= 0, opcode2
= 0, opcode3
= 0;
11744 ULONGEST u_regval
[2] = {0};
11746 opcode1
= bits (thumb_insn_r
->arm_insn
, 10, 12);
11748 if (bit (thumb_insn_r
->arm_insn
, 12))
11750 /* Handle load/store register offset. */
11751 opcode2
= bits (thumb_insn_r
->arm_insn
, 9, 10);
11752 if (opcode2
>= 12 && opcode2
<= 15)
11754 /* LDR(2), LDRB(2) , LDRH(2), LDRSB, LDRSH. */
11755 reg_src1
= bits (thumb_insn_r
->arm_insn
,0, 2);
11756 record_buf
[0] = reg_src1
;
11757 thumb_insn_r
->reg_rec_count
= 1;
11759 else if (opcode2
>= 8 && opcode2
<= 10)
11761 /* STR(2), STRB(2), STRH(2) . */
11762 reg_src1
= bits (thumb_insn_r
->arm_insn
, 3, 5);
11763 reg_src2
= bits (thumb_insn_r
->arm_insn
, 6, 8);
11764 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
[0]);
11765 regcache_raw_read_unsigned (reg_cache
, reg_src2
, &u_regval
[1]);
11767 record_buf_mem
[0] = 4; /* STR (2). */
11768 else if (10 == opcode2
)
11769 record_buf_mem
[0] = 1; /* STRB (2). */
11770 else if (9 == opcode2
)
11771 record_buf_mem
[0] = 2; /* STRH (2). */
11772 record_buf_mem
[1] = u_regval
[0] + u_regval
[1];
11773 thumb_insn_r
->mem_rec_count
= 1;
11776 else if (bit (thumb_insn_r
->arm_insn
, 11))
11778 /* Handle load from literal pool. */
11780 reg_src1
= bits (thumb_insn_r
->arm_insn
, 8, 10);
11781 record_buf
[0] = reg_src1
;
11782 thumb_insn_r
->reg_rec_count
= 1;
11786 opcode2
= bits (thumb_insn_r
->arm_insn
, 8, 9);
11787 opcode3
= bits (thumb_insn_r
->arm_insn
, 0, 2);
11788 if ((3 == opcode2
) && (!opcode3
))
11790 /* Branch with exchange. */
11791 record_buf
[0] = ARM_PS_REGNUM
;
11792 thumb_insn_r
->reg_rec_count
= 1;
11796 /* Format 8; special data processing insns. */
11797 record_buf
[0] = ARM_PS_REGNUM
;
11798 record_buf
[1] = (bit (thumb_insn_r
->arm_insn
, 7) << 3
11799 | bits (thumb_insn_r
->arm_insn
, 0, 2));
11800 thumb_insn_r
->reg_rec_count
= 2;
11805 /* Format 5; data processing insns. */
11806 reg_src1
= bits (thumb_insn_r
->arm_insn
, 0, 2);
11807 if (bit (thumb_insn_r
->arm_insn
, 7))
11809 reg_src1
= reg_src1
+ 8;
11811 record_buf
[0] = ARM_PS_REGNUM
;
11812 record_buf
[1] = reg_src1
;
11813 thumb_insn_r
->reg_rec_count
= 2;
11816 REG_ALLOC (thumb_insn_r
->arm_regs
, thumb_insn_r
->reg_rec_count
, record_buf
);
11817 MEM_ALLOC (thumb_insn_r
->arm_mems
, thumb_insn_r
->mem_rec_count
,
11823 /* Handling opcode 001 insns. */
11826 thumb_record_ld_st_imm_offset (insn_decode_record
*thumb_insn_r
)
11828 struct regcache
*reg_cache
= thumb_insn_r
->regcache
;
11829 uint32_t record_buf
[8], record_buf_mem
[8];
11831 uint32_t reg_src1
= 0;
11832 uint32_t opcode
= 0, immed_5
= 0;
11834 ULONGEST u_regval
= 0;
11836 opcode
= bits (thumb_insn_r
->arm_insn
, 11, 12);
11841 reg_src1
= bits (thumb_insn_r
->arm_insn
, 0, 2);
11842 record_buf
[0] = reg_src1
;
11843 thumb_insn_r
->reg_rec_count
= 1;
11848 reg_src1
= bits (thumb_insn_r
->arm_insn
, 3, 5);
11849 immed_5
= bits (thumb_insn_r
->arm_insn
, 6, 10);
11850 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
);
11851 record_buf_mem
[0] = 4;
11852 record_buf_mem
[1] = u_regval
+ (immed_5
* 4);
11853 thumb_insn_r
->mem_rec_count
= 1;
11856 REG_ALLOC (thumb_insn_r
->arm_regs
, thumb_insn_r
->reg_rec_count
, record_buf
);
11857 MEM_ALLOC (thumb_insn_r
->arm_mems
, thumb_insn_r
->mem_rec_count
,
11863 /* Handling opcode 100 insns. */
11866 thumb_record_ld_st_stack (insn_decode_record
*thumb_insn_r
)
11868 struct regcache
*reg_cache
= thumb_insn_r
->regcache
;
11869 uint32_t record_buf
[8], record_buf_mem
[8];
11871 uint32_t reg_src1
= 0;
11872 uint32_t opcode
= 0, immed_8
= 0, immed_5
= 0;
11874 ULONGEST u_regval
= 0;
11876 opcode
= bits (thumb_insn_r
->arm_insn
, 11, 12);
11881 reg_src1
= bits (thumb_insn_r
->arm_insn
, 8, 10);
11882 record_buf
[0] = reg_src1
;
11883 thumb_insn_r
->reg_rec_count
= 1;
11885 else if (1 == opcode
)
11888 reg_src1
= bits (thumb_insn_r
->arm_insn
, 0, 2);
11889 record_buf
[0] = reg_src1
;
11890 thumb_insn_r
->reg_rec_count
= 1;
11892 else if (2 == opcode
)
11895 immed_8
= bits (thumb_insn_r
->arm_insn
, 0, 7);
11896 regcache_raw_read_unsigned (reg_cache
, ARM_SP_REGNUM
, &u_regval
);
11897 record_buf_mem
[0] = 4;
11898 record_buf_mem
[1] = u_regval
+ (immed_8
* 4);
11899 thumb_insn_r
->mem_rec_count
= 1;
11901 else if (0 == opcode
)
11904 immed_5
= bits (thumb_insn_r
->arm_insn
, 6, 10);
11905 reg_src1
= bits (thumb_insn_r
->arm_insn
, 3, 5);
11906 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
);
11907 record_buf_mem
[0] = 2;
11908 record_buf_mem
[1] = u_regval
+ (immed_5
* 2);
11909 thumb_insn_r
->mem_rec_count
= 1;
11912 REG_ALLOC (thumb_insn_r
->arm_regs
, thumb_insn_r
->reg_rec_count
, record_buf
);
11913 MEM_ALLOC (thumb_insn_r
->arm_mems
, thumb_insn_r
->mem_rec_count
,
11919 /* Handling opcode 101 insns. */
11922 thumb_record_misc (insn_decode_record
*thumb_insn_r
)
11924 struct regcache
*reg_cache
= thumb_insn_r
->regcache
;
11926 uint32_t opcode
= 0, opcode1
= 0, opcode2
= 0;
11927 uint32_t register_bits
= 0, register_count
= 0;
11928 uint32_t index
= 0, start_address
= 0;
11929 uint32_t record_buf
[24], record_buf_mem
[48];
11932 ULONGEST u_regval
= 0;
11934 opcode
= bits (thumb_insn_r
->arm_insn
, 11, 12);
11935 opcode1
= bits (thumb_insn_r
->arm_insn
, 8, 12);
11936 opcode2
= bits (thumb_insn_r
->arm_insn
, 9, 12);
11941 register_bits
= bits (thumb_insn_r
->arm_insn
, 0, 7);
11942 while (register_bits
)
11944 if (register_bits
& 0x00000001)
11945 record_buf
[index
++] = register_count
;
11946 register_bits
= register_bits
>> 1;
11949 record_buf
[index
++] = ARM_PS_REGNUM
;
11950 record_buf
[index
++] = ARM_SP_REGNUM
;
11951 thumb_insn_r
->reg_rec_count
= index
;
11953 else if (10 == opcode2
)
11956 register_bits
= bits (thumb_insn_r
->arm_insn
, 0, 7);
11957 regcache_raw_read_unsigned (reg_cache
, ARM_SP_REGNUM
, &u_regval
);
11958 while (register_bits
)
11960 if (register_bits
& 0x00000001)
11962 register_bits
= register_bits
>> 1;
11964 start_address
= u_regval
- \
11965 (4 * (bit (thumb_insn_r
->arm_insn
, 8) + register_count
));
11966 thumb_insn_r
->mem_rec_count
= register_count
;
11967 while (register_count
)
11969 record_buf_mem
[(register_count
* 2) - 1] = start_address
;
11970 record_buf_mem
[(register_count
* 2) - 2] = 4;
11971 start_address
= start_address
+ 4;
11974 record_buf
[0] = ARM_SP_REGNUM
;
11975 thumb_insn_r
->reg_rec_count
= 1;
11977 else if (0x1E == opcode1
)
11980 /* Handle enhanced software breakpoint insn, BKPT. */
11981 /* CPSR is changed to be executed in ARM state, disabling normal
11982 interrupts, entering abort mode. */
11983 /* According to high vector configuration PC is set. */
11984 /* User hits breakpoint and type reverse, in that case, we need to go back with
11985 previous CPSR and Program Counter. */
11986 record_buf
[0] = ARM_PS_REGNUM
;
11987 record_buf
[1] = ARM_LR_REGNUM
;
11988 thumb_insn_r
->reg_rec_count
= 2;
11989 /* We need to save SPSR value, which is not yet done. */
11990 printf_unfiltered (_("Process record does not support instruction "
11991 "0x%0x at address %s.\n"),
11992 thumb_insn_r
->arm_insn
,
11993 paddress (thumb_insn_r
->gdbarch
,
11994 thumb_insn_r
->this_addr
));
11997 else if ((0 == opcode
) || (1 == opcode
))
11999 /* ADD(5), ADD(6). */
12000 reg_src1
= bits (thumb_insn_r
->arm_insn
, 8, 10);
12001 record_buf
[0] = reg_src1
;
12002 thumb_insn_r
->reg_rec_count
= 1;
12004 else if (2 == opcode
)
12006 /* ADD(7), SUB(4). */
12007 reg_src1
= bits (thumb_insn_r
->arm_insn
, 8, 10);
12008 record_buf
[0] = ARM_SP_REGNUM
;
12009 thumb_insn_r
->reg_rec_count
= 1;
12012 REG_ALLOC (thumb_insn_r
->arm_regs
, thumb_insn_r
->reg_rec_count
, record_buf
);
12013 MEM_ALLOC (thumb_insn_r
->arm_mems
, thumb_insn_r
->mem_rec_count
,
12019 /* Handling opcode 110 insns. */
12022 thumb_record_ldm_stm_swi (insn_decode_record
*thumb_insn_r
)
12024 struct gdbarch_tdep
*tdep
= gdbarch_tdep (thumb_insn_r
->gdbarch
);
12025 struct regcache
*reg_cache
= thumb_insn_r
->regcache
;
12027 uint32_t ret
= 0; /* function return value: -1:record failure ; 0:success */
12028 uint32_t reg_src1
= 0;
12029 uint32_t opcode1
= 0, opcode2
= 0, register_bits
= 0, register_count
= 0;
12030 uint32_t index
= 0, start_address
= 0;
12031 uint32_t record_buf
[24], record_buf_mem
[48];
12033 ULONGEST u_regval
= 0;
12035 opcode1
= bits (thumb_insn_r
->arm_insn
, 8, 12);
12036 opcode2
= bits (thumb_insn_r
->arm_insn
, 11, 12);
12042 register_bits
= bits (thumb_insn_r
->arm_insn
, 0, 7);
12044 reg_src1
= bits (thumb_insn_r
->arm_insn
, 8, 10);
12045 while (register_bits
)
12047 if (register_bits
& 0x00000001)
12048 record_buf
[index
++] = register_count
;
12049 register_bits
= register_bits
>> 1;
12052 record_buf
[index
++] = reg_src1
;
12053 thumb_insn_r
->reg_rec_count
= index
;
12055 else if (0 == opcode2
)
12057 /* It handles both STMIA. */
12058 register_bits
= bits (thumb_insn_r
->arm_insn
, 0, 7);
12060 reg_src1
= bits (thumb_insn_r
->arm_insn
, 8, 10);
12061 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
);
12062 while (register_bits
)
12064 if (register_bits
& 0x00000001)
12066 register_bits
= register_bits
>> 1;
12068 start_address
= u_regval
;
12069 thumb_insn_r
->mem_rec_count
= register_count
;
12070 while (register_count
)
12072 record_buf_mem
[(register_count
* 2) - 1] = start_address
;
12073 record_buf_mem
[(register_count
* 2) - 2] = 4;
12074 start_address
= start_address
+ 4;
12078 else if (0x1F == opcode1
)
12080 /* Handle arm syscall insn. */
12081 if (tdep
->arm_syscall_record
!= NULL
)
12083 regcache_raw_read_unsigned (reg_cache
, 7, &u_regval
);
12084 ret
= tdep
->arm_syscall_record (reg_cache
, u_regval
);
12088 printf_unfiltered (_("no syscall record support\n"));
12093 /* B (1), conditional branch is automatically taken care in process_record,
12094 as PC is saved there. */
12096 REG_ALLOC (thumb_insn_r
->arm_regs
, thumb_insn_r
->reg_rec_count
, record_buf
);
12097 MEM_ALLOC (thumb_insn_r
->arm_mems
, thumb_insn_r
->mem_rec_count
,
12103 /* Handling opcode 111 insns. */
12106 thumb_record_branch (insn_decode_record
*thumb_insn_r
)
12108 uint32_t record_buf
[8];
12109 uint32_t bits_h
= 0;
12111 bits_h
= bits (thumb_insn_r
->arm_insn
, 11, 12);
12113 if (2 == bits_h
|| 3 == bits_h
)
12116 record_buf
[0] = ARM_LR_REGNUM
;
12117 thumb_insn_r
->reg_rec_count
= 1;
12119 else if (1 == bits_h
)
12122 record_buf
[0] = ARM_PS_REGNUM
;
12123 record_buf
[1] = ARM_LR_REGNUM
;
12124 thumb_insn_r
->reg_rec_count
= 2;
12127 /* B(2) is automatically taken care in process_record, as PC is
12130 REG_ALLOC (thumb_insn_r
->arm_regs
, thumb_insn_r
->reg_rec_count
, record_buf
);
12135 /* Handler for thumb2 load/store multiple instructions. */
12138 thumb2_record_ld_st_multiple (insn_decode_record
*thumb2_insn_r
)
12140 struct regcache
*reg_cache
= thumb2_insn_r
->regcache
;
12142 uint32_t reg_rn
, op
;
12143 uint32_t register_bits
= 0, register_count
= 0;
12144 uint32_t index
= 0, start_address
= 0;
12145 uint32_t record_buf
[24], record_buf_mem
[48];
12147 ULONGEST u_regval
= 0;
12149 reg_rn
= bits (thumb2_insn_r
->arm_insn
, 16, 19);
12150 op
= bits (thumb2_insn_r
->arm_insn
, 23, 24);
12152 if (0 == op
|| 3 == op
)
12154 if (bit (thumb2_insn_r
->arm_insn
, INSN_S_L_BIT_NUM
))
12156 /* Handle RFE instruction. */
12157 record_buf
[0] = ARM_PS_REGNUM
;
12158 thumb2_insn_r
->reg_rec_count
= 1;
12162 /* Handle SRS instruction after reading banked SP. */
12163 return arm_record_unsupported_insn (thumb2_insn_r
);
12166 else if (1 == op
|| 2 == op
)
12168 if (bit (thumb2_insn_r
->arm_insn
, INSN_S_L_BIT_NUM
))
12170 /* Handle LDM/LDMIA/LDMFD and LDMDB/LDMEA instructions. */
12171 register_bits
= bits (thumb2_insn_r
->arm_insn
, 0, 15);
12172 while (register_bits
)
12174 if (register_bits
& 0x00000001)
12175 record_buf
[index
++] = register_count
;
12178 register_bits
= register_bits
>> 1;
12180 record_buf
[index
++] = reg_rn
;
12181 record_buf
[index
++] = ARM_PS_REGNUM
;
12182 thumb2_insn_r
->reg_rec_count
= index
;
12186 /* Handle STM/STMIA/STMEA and STMDB/STMFD. */
12187 register_bits
= bits (thumb2_insn_r
->arm_insn
, 0, 15);
12188 regcache_raw_read_unsigned (reg_cache
, reg_rn
, &u_regval
);
12189 while (register_bits
)
12191 if (register_bits
& 0x00000001)
12194 register_bits
= register_bits
>> 1;
12199 /* Start address calculation for LDMDB/LDMEA. */
12200 start_address
= u_regval
;
12204 /* Start address calculation for LDMDB/LDMEA. */
12205 start_address
= u_regval
- register_count
* 4;
12208 thumb2_insn_r
->mem_rec_count
= register_count
;
12209 while (register_count
)
12211 record_buf_mem
[register_count
* 2 - 1] = start_address
;
12212 record_buf_mem
[register_count
* 2 - 2] = 4;
12213 start_address
= start_address
+ 4;
12216 record_buf
[0] = reg_rn
;
12217 record_buf
[1] = ARM_PS_REGNUM
;
12218 thumb2_insn_r
->reg_rec_count
= 2;
12222 MEM_ALLOC (thumb2_insn_r
->arm_mems
, thumb2_insn_r
->mem_rec_count
,
12224 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12226 return ARM_RECORD_SUCCESS
;
12229 /* Handler for thumb2 load/store (dual/exclusive) and table branch
12233 thumb2_record_ld_st_dual_ex_tbb (insn_decode_record
*thumb2_insn_r
)
12235 struct regcache
*reg_cache
= thumb2_insn_r
->regcache
;
12237 uint32_t reg_rd
, reg_rn
, offset_imm
;
12238 uint32_t reg_dest1
, reg_dest2
;
12239 uint32_t address
, offset_addr
;
12240 uint32_t record_buf
[8], record_buf_mem
[8];
12241 uint32_t op1
, op2
, op3
;
12243 ULONGEST u_regval
[2];
12245 op1
= bits (thumb2_insn_r
->arm_insn
, 23, 24);
12246 op2
= bits (thumb2_insn_r
->arm_insn
, 20, 21);
12247 op3
= bits (thumb2_insn_r
->arm_insn
, 4, 7);
12249 if (bit (thumb2_insn_r
->arm_insn
, INSN_S_L_BIT_NUM
))
12251 if(!(1 == op1
&& 1 == op2
&& (0 == op3
|| 1 == op3
)))
12253 reg_dest1
= bits (thumb2_insn_r
->arm_insn
, 12, 15);
12254 record_buf
[0] = reg_dest1
;
12255 record_buf
[1] = ARM_PS_REGNUM
;
12256 thumb2_insn_r
->reg_rec_count
= 2;
12259 if (3 == op2
|| (op1
& 2) || (1 == op1
&& 1 == op2
&& 7 == op3
))
12261 reg_dest2
= bits (thumb2_insn_r
->arm_insn
, 8, 11);
12262 record_buf
[2] = reg_dest2
;
12263 thumb2_insn_r
->reg_rec_count
= 3;
12268 reg_rn
= bits (thumb2_insn_r
->arm_insn
, 16, 19);
12269 regcache_raw_read_unsigned (reg_cache
, reg_rn
, &u_regval
[0]);
12271 if (0 == op1
&& 0 == op2
)
12273 /* Handle STREX. */
12274 offset_imm
= bits (thumb2_insn_r
->arm_insn
, 0, 7);
12275 address
= u_regval
[0] + (offset_imm
* 4);
12276 record_buf_mem
[0] = 4;
12277 record_buf_mem
[1] = address
;
12278 thumb2_insn_r
->mem_rec_count
= 1;
12279 reg_rd
= bits (thumb2_insn_r
->arm_insn
, 0, 3);
12280 record_buf
[0] = reg_rd
;
12281 thumb2_insn_r
->reg_rec_count
= 1;
12283 else if (1 == op1
&& 0 == op2
)
12285 reg_rd
= bits (thumb2_insn_r
->arm_insn
, 0, 3);
12286 record_buf
[0] = reg_rd
;
12287 thumb2_insn_r
->reg_rec_count
= 1;
12288 address
= u_regval
[0];
12289 record_buf_mem
[1] = address
;
12293 /* Handle STREXB. */
12294 record_buf_mem
[0] = 1;
12295 thumb2_insn_r
->mem_rec_count
= 1;
12299 /* Handle STREXH. */
12300 record_buf_mem
[0] = 2 ;
12301 thumb2_insn_r
->mem_rec_count
= 1;
12305 /* Handle STREXD. */
12306 address
= u_regval
[0];
12307 record_buf_mem
[0] = 4;
12308 record_buf_mem
[2] = 4;
12309 record_buf_mem
[3] = address
+ 4;
12310 thumb2_insn_r
->mem_rec_count
= 2;
12315 offset_imm
= bits (thumb2_insn_r
->arm_insn
, 0, 7);
12317 if (bit (thumb2_insn_r
->arm_insn
, 24))
12319 if (bit (thumb2_insn_r
->arm_insn
, 23))
12320 offset_addr
= u_regval
[0] + (offset_imm
* 4);
12322 offset_addr
= u_regval
[0] - (offset_imm
* 4);
12324 address
= offset_addr
;
12327 address
= u_regval
[0];
12329 record_buf_mem
[0] = 4;
12330 record_buf_mem
[1] = address
;
12331 record_buf_mem
[2] = 4;
12332 record_buf_mem
[3] = address
+ 4;
12333 thumb2_insn_r
->mem_rec_count
= 2;
12334 record_buf
[0] = reg_rn
;
12335 thumb2_insn_r
->reg_rec_count
= 1;
12339 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12341 MEM_ALLOC (thumb2_insn_r
->arm_mems
, thumb2_insn_r
->mem_rec_count
,
12343 return ARM_RECORD_SUCCESS
;
12346 /* Handler for thumb2 data processing (shift register and modified immediate)
12350 thumb2_record_data_proc_sreg_mimm (insn_decode_record
*thumb2_insn_r
)
12352 uint32_t reg_rd
, op
;
12353 uint32_t record_buf
[8];
12355 op
= bits (thumb2_insn_r
->arm_insn
, 21, 24);
12356 reg_rd
= bits (thumb2_insn_r
->arm_insn
, 8, 11);
12358 if ((0 == op
|| 4 == op
|| 8 == op
|| 13 == op
) && 15 == reg_rd
)
12360 record_buf
[0] = ARM_PS_REGNUM
;
12361 thumb2_insn_r
->reg_rec_count
= 1;
12365 record_buf
[0] = reg_rd
;
12366 record_buf
[1] = ARM_PS_REGNUM
;
12367 thumb2_insn_r
->reg_rec_count
= 2;
12370 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12372 return ARM_RECORD_SUCCESS
;
12375 /* Generic handler for thumb2 instructions which effect destination and PS
12379 thumb2_record_ps_dest_generic (insn_decode_record
*thumb2_insn_r
)
12382 uint32_t record_buf
[8];
12384 reg_rd
= bits (thumb2_insn_r
->arm_insn
, 8, 11);
12386 record_buf
[0] = reg_rd
;
12387 record_buf
[1] = ARM_PS_REGNUM
;
12388 thumb2_insn_r
->reg_rec_count
= 2;
12390 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12392 return ARM_RECORD_SUCCESS
;
12395 /* Handler for thumb2 branch and miscellaneous control instructions. */
12398 thumb2_record_branch_misc_cntrl (insn_decode_record
*thumb2_insn_r
)
12400 uint32_t op
, op1
, op2
;
12401 uint32_t record_buf
[8];
12403 op
= bits (thumb2_insn_r
->arm_insn
, 20, 26);
12404 op1
= bits (thumb2_insn_r
->arm_insn
, 12, 14);
12405 op2
= bits (thumb2_insn_r
->arm_insn
, 8, 11);
12407 /* Handle MSR insn. */
12408 if (!(op1
& 0x2) && 0x38 == op
)
12412 /* CPSR is going to be changed. */
12413 record_buf
[0] = ARM_PS_REGNUM
;
12414 thumb2_insn_r
->reg_rec_count
= 1;
12418 arm_record_unsupported_insn(thumb2_insn_r
);
12422 else if (4 == (op1
& 0x5) || 5 == (op1
& 0x5))
12425 record_buf
[0] = ARM_PS_REGNUM
;
12426 record_buf
[1] = ARM_LR_REGNUM
;
12427 thumb2_insn_r
->reg_rec_count
= 2;
12430 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12432 return ARM_RECORD_SUCCESS
;
12435 /* Handler for thumb2 store single data item instructions. */
12438 thumb2_record_str_single_data (insn_decode_record
*thumb2_insn_r
)
12440 struct regcache
*reg_cache
= thumb2_insn_r
->regcache
;
12442 uint32_t reg_rn
, reg_rm
, offset_imm
, shift_imm
;
12443 uint32_t address
, offset_addr
;
12444 uint32_t record_buf
[8], record_buf_mem
[8];
12447 ULONGEST u_regval
[2];
12449 op1
= bits (thumb2_insn_r
->arm_insn
, 21, 23);
12450 op2
= bits (thumb2_insn_r
->arm_insn
, 6, 11);
12451 reg_rn
= bits (thumb2_insn_r
->arm_insn
, 16, 19);
12452 regcache_raw_read_unsigned (reg_cache
, reg_rn
, &u_regval
[0]);
12454 if (bit (thumb2_insn_r
->arm_insn
, 23))
12457 offset_imm
= bits (thumb2_insn_r
->arm_insn
, 0, 11);
12458 offset_addr
= u_regval
[0] + offset_imm
;
12459 address
= offset_addr
;
12464 if ((0 == op1
|| 1 == op1
|| 2 == op1
) && !(op2
& 0x20))
12466 /* Handle STRB (register). */
12467 reg_rm
= bits (thumb2_insn_r
->arm_insn
, 0, 3);
12468 regcache_raw_read_unsigned (reg_cache
, reg_rm
, &u_regval
[1]);
12469 shift_imm
= bits (thumb2_insn_r
->arm_insn
, 4, 5);
12470 offset_addr
= u_regval
[1] << shift_imm
;
12471 address
= u_regval
[0] + offset_addr
;
12475 offset_imm
= bits (thumb2_insn_r
->arm_insn
, 0, 7);
12476 if (bit (thumb2_insn_r
->arm_insn
, 10))
12478 if (bit (thumb2_insn_r
->arm_insn
, 9))
12479 offset_addr
= u_regval
[0] + offset_imm
;
12481 offset_addr
= u_regval
[0] - offset_imm
;
12483 address
= offset_addr
;
12486 address
= u_regval
[0];
12492 /* Store byte instructions. */
12495 record_buf_mem
[0] = 1;
12497 /* Store half word instructions. */
12500 record_buf_mem
[0] = 2;
12502 /* Store word instructions. */
12505 record_buf_mem
[0] = 4;
12509 gdb_assert_not_reached ("no decoding pattern found");
12513 record_buf_mem
[1] = address
;
12514 thumb2_insn_r
->mem_rec_count
= 1;
12515 record_buf
[0] = reg_rn
;
12516 thumb2_insn_r
->reg_rec_count
= 1;
12518 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12520 MEM_ALLOC (thumb2_insn_r
->arm_mems
, thumb2_insn_r
->mem_rec_count
,
12522 return ARM_RECORD_SUCCESS
;
12525 /* Handler for thumb2 load memory hints instructions. */
12528 thumb2_record_ld_mem_hints (insn_decode_record
*thumb2_insn_r
)
12530 uint32_t record_buf
[8];
12531 uint32_t reg_rt
, reg_rn
;
12533 reg_rt
= bits (thumb2_insn_r
->arm_insn
, 12, 15);
12534 reg_rn
= bits (thumb2_insn_r
->arm_insn
, 16, 19);
12536 if (ARM_PC_REGNUM
!= reg_rt
)
12538 record_buf
[0] = reg_rt
;
12539 record_buf
[1] = reg_rn
;
12540 record_buf
[2] = ARM_PS_REGNUM
;
12541 thumb2_insn_r
->reg_rec_count
= 3;
12543 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12545 return ARM_RECORD_SUCCESS
;
12548 return ARM_RECORD_FAILURE
;
12551 /* Handler for thumb2 load word instructions. */
12554 thumb2_record_ld_word (insn_decode_record
*thumb2_insn_r
)
12556 uint32_t record_buf
[8];
12558 record_buf
[0] = bits (thumb2_insn_r
->arm_insn
, 12, 15);
12559 record_buf
[1] = ARM_PS_REGNUM
;
12560 thumb2_insn_r
->reg_rec_count
= 2;
12562 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12564 return ARM_RECORD_SUCCESS
;
12567 /* Handler for thumb2 long multiply, long multiply accumulate, and
12568 divide instructions. */
12571 thumb2_record_lmul_lmla_div (insn_decode_record
*thumb2_insn_r
)
12573 uint32_t opcode1
= 0, opcode2
= 0;
12574 uint32_t record_buf
[8];
12576 opcode1
= bits (thumb2_insn_r
->arm_insn
, 20, 22);
12577 opcode2
= bits (thumb2_insn_r
->arm_insn
, 4, 7);
12579 if (0 == opcode1
|| 2 == opcode1
|| (opcode1
>= 4 && opcode1
<= 6))
12581 /* Handle SMULL, UMULL, SMULAL. */
12582 /* Handle SMLAL(S), SMULL(S), UMLAL(S), UMULL(S). */
12583 record_buf
[0] = bits (thumb2_insn_r
->arm_insn
, 16, 19);
12584 record_buf
[1] = bits (thumb2_insn_r
->arm_insn
, 12, 15);
12585 record_buf
[2] = ARM_PS_REGNUM
;
12586 thumb2_insn_r
->reg_rec_count
= 3;
12588 else if (1 == opcode1
|| 3 == opcode2
)
12590 /* Handle SDIV and UDIV. */
12591 record_buf
[0] = bits (thumb2_insn_r
->arm_insn
, 16, 19);
12592 record_buf
[1] = bits (thumb2_insn_r
->arm_insn
, 12, 15);
12593 record_buf
[2] = ARM_PS_REGNUM
;
12594 thumb2_insn_r
->reg_rec_count
= 3;
12597 return ARM_RECORD_FAILURE
;
12599 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12601 return ARM_RECORD_SUCCESS
;
12604 /* Record handler for thumb32 coprocessor instructions. */
12607 thumb2_record_coproc_insn (insn_decode_record
*thumb2_insn_r
)
12609 if (bit (thumb2_insn_r
->arm_insn
, 25))
12610 return arm_record_coproc_data_proc (thumb2_insn_r
);
12612 return arm_record_asimd_vfp_coproc (thumb2_insn_r
);
12615 /* Record handler for advance SIMD structure load/store instructions. */
12618 thumb2_record_asimd_struct_ld_st (insn_decode_record
*thumb2_insn_r
)
12620 struct regcache
*reg_cache
= thumb2_insn_r
->regcache
;
12621 uint32_t l_bit
, a_bit
, b_bits
;
12622 uint32_t record_buf
[128], record_buf_mem
[128];
12623 uint32_t reg_rn
, reg_vd
, address
, f_elem
;
12624 uint32_t index_r
= 0, index_e
= 0, bf_regs
= 0, index_m
= 0, loop_t
= 0;
12627 l_bit
= bit (thumb2_insn_r
->arm_insn
, 21);
12628 a_bit
= bit (thumb2_insn_r
->arm_insn
, 23);
12629 b_bits
= bits (thumb2_insn_r
->arm_insn
, 8, 11);
12630 reg_rn
= bits (thumb2_insn_r
->arm_insn
, 16, 19);
12631 reg_vd
= bits (thumb2_insn_r
->arm_insn
, 12, 15);
12632 reg_vd
= (bit (thumb2_insn_r
->arm_insn
, 22) << 4) | reg_vd
;
12633 f_ebytes
= (1 << bits (thumb2_insn_r
->arm_insn
, 6, 7));
12634 f_elem
= 8 / f_ebytes
;
12638 ULONGEST u_regval
= 0;
12639 regcache_raw_read_unsigned (reg_cache
, reg_rn
, &u_regval
);
12640 address
= u_regval
;
12645 if (b_bits
== 0x02 || b_bits
== 0x0a || (b_bits
& 0x0e) == 0x06)
12647 if (b_bits
== 0x07)
12649 else if (b_bits
== 0x0a)
12651 else if (b_bits
== 0x06)
12653 else if (b_bits
== 0x02)
12658 for (index_r
= 0; index_r
< bf_regs
; index_r
++)
12660 for (index_e
= 0; index_e
< f_elem
; index_e
++)
12662 record_buf_mem
[index_m
++] = f_ebytes
;
12663 record_buf_mem
[index_m
++] = address
;
12664 address
= address
+ f_ebytes
;
12665 thumb2_insn_r
->mem_rec_count
+= 1;
12670 else if (b_bits
== 0x03 || (b_bits
& 0x0e) == 0x08)
12672 if (b_bits
== 0x09 || b_bits
== 0x08)
12674 else if (b_bits
== 0x03)
12679 for (index_r
= 0; index_r
< bf_regs
; index_r
++)
12680 for (index_e
= 0; index_e
< f_elem
; index_e
++)
12682 for (loop_t
= 0; loop_t
< 2; loop_t
++)
12684 record_buf_mem
[index_m
++] = f_ebytes
;
12685 record_buf_mem
[index_m
++] = address
+ (loop_t
* f_ebytes
);
12686 thumb2_insn_r
->mem_rec_count
+= 1;
12688 address
= address
+ (2 * f_ebytes
);
12692 else if ((b_bits
& 0x0e) == 0x04)
12694 for (index_e
= 0; index_e
< f_elem
; index_e
++)
12696 for (loop_t
= 0; loop_t
< 3; loop_t
++)
12698 record_buf_mem
[index_m
++] = f_ebytes
;
12699 record_buf_mem
[index_m
++] = address
+ (loop_t
* f_ebytes
);
12700 thumb2_insn_r
->mem_rec_count
+= 1;
12702 address
= address
+ (3 * f_ebytes
);
12706 else if (!(b_bits
& 0x0e))
12708 for (index_e
= 0; index_e
< f_elem
; index_e
++)
12710 for (loop_t
= 0; loop_t
< 4; loop_t
++)
12712 record_buf_mem
[index_m
++] = f_ebytes
;
12713 record_buf_mem
[index_m
++] = address
+ (loop_t
* f_ebytes
);
12714 thumb2_insn_r
->mem_rec_count
+= 1;
12716 address
= address
+ (4 * f_ebytes
);
12722 uint8_t bft_size
= bits (thumb2_insn_r
->arm_insn
, 10, 11);
12724 if (bft_size
== 0x00)
12726 else if (bft_size
== 0x01)
12728 else if (bft_size
== 0x02)
12734 if (!(b_bits
& 0x0b) || b_bits
== 0x08)
12735 thumb2_insn_r
->mem_rec_count
= 1;
12737 else if ((b_bits
& 0x0b) == 0x01 || b_bits
== 0x09)
12738 thumb2_insn_r
->mem_rec_count
= 2;
12740 else if ((b_bits
& 0x0b) == 0x02 || b_bits
== 0x0a)
12741 thumb2_insn_r
->mem_rec_count
= 3;
12743 else if ((b_bits
& 0x0b) == 0x03 || b_bits
== 0x0b)
12744 thumb2_insn_r
->mem_rec_count
= 4;
12746 for (index_m
= 0; index_m
< thumb2_insn_r
->mem_rec_count
; index_m
++)
12748 record_buf_mem
[index_m
] = f_ebytes
;
12749 record_buf_mem
[index_m
] = address
+ (index_m
* f_ebytes
);
12758 if (b_bits
== 0x02 || b_bits
== 0x0a || (b_bits
& 0x0e) == 0x06)
12759 thumb2_insn_r
->reg_rec_count
= 1;
12761 else if (b_bits
== 0x03 || (b_bits
& 0x0e) == 0x08)
12762 thumb2_insn_r
->reg_rec_count
= 2;
12764 else if ((b_bits
& 0x0e) == 0x04)
12765 thumb2_insn_r
->reg_rec_count
= 3;
12767 else if (!(b_bits
& 0x0e))
12768 thumb2_insn_r
->reg_rec_count
= 4;
12773 if (!(b_bits
& 0x0b) || b_bits
== 0x08 || b_bits
== 0x0c)
12774 thumb2_insn_r
->reg_rec_count
= 1;
12776 else if ((b_bits
& 0x0b) == 0x01 || b_bits
== 0x09 || b_bits
== 0x0d)
12777 thumb2_insn_r
->reg_rec_count
= 2;
12779 else if ((b_bits
& 0x0b) == 0x02 || b_bits
== 0x0a || b_bits
== 0x0e)
12780 thumb2_insn_r
->reg_rec_count
= 3;
12782 else if ((b_bits
& 0x0b) == 0x03 || b_bits
== 0x0b || b_bits
== 0x0f)
12783 thumb2_insn_r
->reg_rec_count
= 4;
12785 for (index_r
= 0; index_r
< thumb2_insn_r
->reg_rec_count
; index_r
++)
12786 record_buf
[index_r
] = reg_vd
+ ARM_D0_REGNUM
+ index_r
;
12790 if (bits (thumb2_insn_r
->arm_insn
, 0, 3) != 15)
12792 record_buf
[index_r
] = reg_rn
;
12793 thumb2_insn_r
->reg_rec_count
+= 1;
12796 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12798 MEM_ALLOC (thumb2_insn_r
->arm_mems
, thumb2_insn_r
->mem_rec_count
,
12803 /* Decodes thumb2 instruction type and invokes its record handler. */
12805 static unsigned int
12806 thumb2_record_decode_insn_handler (insn_decode_record
*thumb2_insn_r
)
12808 uint32_t op
, op1
, op2
;
12810 op
= bit (thumb2_insn_r
->arm_insn
, 15);
12811 op1
= bits (thumb2_insn_r
->arm_insn
, 27, 28);
12812 op2
= bits (thumb2_insn_r
->arm_insn
, 20, 26);
12816 if (!(op2
& 0x64 ))
12818 /* Load/store multiple instruction. */
12819 return thumb2_record_ld_st_multiple (thumb2_insn_r
);
12821 else if (!((op2
& 0x64) ^ 0x04))
12823 /* Load/store (dual/exclusive) and table branch instruction. */
12824 return thumb2_record_ld_st_dual_ex_tbb (thumb2_insn_r
);
12826 else if (!((op2
& 0x20) ^ 0x20))
12828 /* Data-processing (shifted register). */
12829 return thumb2_record_data_proc_sreg_mimm (thumb2_insn_r
);
12831 else if (op2
& 0x40)
12833 /* Co-processor instructions. */
12834 return thumb2_record_coproc_insn (thumb2_insn_r
);
12837 else if (op1
== 0x02)
12841 /* Branches and miscellaneous control instructions. */
12842 return thumb2_record_branch_misc_cntrl (thumb2_insn_r
);
12844 else if (op2
& 0x20)
12846 /* Data-processing (plain binary immediate) instruction. */
12847 return thumb2_record_ps_dest_generic (thumb2_insn_r
);
12851 /* Data-processing (modified immediate). */
12852 return thumb2_record_data_proc_sreg_mimm (thumb2_insn_r
);
12855 else if (op1
== 0x03)
12857 if (!(op2
& 0x71 ))
12859 /* Store single data item. */
12860 return thumb2_record_str_single_data (thumb2_insn_r
);
12862 else if (!((op2
& 0x71) ^ 0x10))
12864 /* Advanced SIMD or structure load/store instructions. */
12865 return thumb2_record_asimd_struct_ld_st (thumb2_insn_r
);
12867 else if (!((op2
& 0x67) ^ 0x01))
12869 /* Load byte, memory hints instruction. */
12870 return thumb2_record_ld_mem_hints (thumb2_insn_r
);
12872 else if (!((op2
& 0x67) ^ 0x03))
12874 /* Load halfword, memory hints instruction. */
12875 return thumb2_record_ld_mem_hints (thumb2_insn_r
);
12877 else if (!((op2
& 0x67) ^ 0x05))
12879 /* Load word instruction. */
12880 return thumb2_record_ld_word (thumb2_insn_r
);
12882 else if (!((op2
& 0x70) ^ 0x20))
12884 /* Data-processing (register) instruction. */
12885 return thumb2_record_ps_dest_generic (thumb2_insn_r
);
12887 else if (!((op2
& 0x78) ^ 0x30))
12889 /* Multiply, multiply accumulate, abs diff instruction. */
12890 return thumb2_record_ps_dest_generic (thumb2_insn_r
);
12892 else if (!((op2
& 0x78) ^ 0x38))
12894 /* Long multiply, long multiply accumulate, and divide. */
12895 return thumb2_record_lmul_lmla_div (thumb2_insn_r
);
12897 else if (op2
& 0x40)
12899 /* Co-processor instructions. */
12900 return thumb2_record_coproc_insn (thumb2_insn_r
);
12907 /* Extracts arm/thumb/thumb2 insn depending on the size, and returns 0 on success
12908 and positive val on fauilure. */
12911 extract_arm_insn (insn_decode_record
*insn_record
, uint32_t insn_size
)
12913 gdb_byte buf
[insn_size
];
12915 memset (&buf
[0], 0, insn_size
);
12917 if (target_read_memory (insn_record
->this_addr
, &buf
[0], insn_size
))
12919 insn_record
->arm_insn
= (uint32_t) extract_unsigned_integer (&buf
[0],
12921 gdbarch_byte_order_for_code (insn_record
->gdbarch
));
12925 typedef int (*sti_arm_hdl_fp_t
) (insn_decode_record
*);
12927 /* Decode arm/thumb insn depending on condition cods and opcodes; and
12931 decode_insn (insn_decode_record
*arm_record
, record_type_t record_type
,
12932 uint32_t insn_size
)
12935 /* (Starting from numerical 0); bits 25, 26, 27 decodes type of arm
12937 static const sti_arm_hdl_fp_t arm_handle_insn
[8] =
12939 arm_record_data_proc_misc_ld_str
, /* 000. */
12940 arm_record_data_proc_imm
, /* 001. */
12941 arm_record_ld_st_imm_offset
, /* 010. */
12942 arm_record_ld_st_reg_offset
, /* 011. */
12943 arm_record_ld_st_multiple
, /* 100. */
12944 arm_record_b_bl
, /* 101. */
12945 arm_record_asimd_vfp_coproc
, /* 110. */
12946 arm_record_coproc_data_proc
/* 111. */
12949 /* (Starting from numerical 0); bits 13,14,15 decodes type of thumb
12951 static const sti_arm_hdl_fp_t thumb_handle_insn
[8] =
12953 thumb_record_shift_add_sub
, /* 000. */
12954 thumb_record_add_sub_cmp_mov
, /* 001. */
12955 thumb_record_ld_st_reg_offset
, /* 010. */
12956 thumb_record_ld_st_imm_offset
, /* 011. */
12957 thumb_record_ld_st_stack
, /* 100. */
12958 thumb_record_misc
, /* 101. */
12959 thumb_record_ldm_stm_swi
, /* 110. */
12960 thumb_record_branch
/* 111. */
12963 uint32_t ret
= 0; /* return value: negative:failure 0:success. */
12964 uint32_t insn_id
= 0;
12966 if (extract_arm_insn (arm_record
, insn_size
))
12970 printf_unfiltered (_("Process record: error reading memory at "
12971 "addr %s len = %d.\n"),
12972 paddress (arm_record
->gdbarch
,
12973 arm_record
->this_addr
), insn_size
);
12977 else if (ARM_RECORD
== record_type
)
12979 arm_record
->cond
= bits (arm_record
->arm_insn
, 28, 31);
12980 insn_id
= bits (arm_record
->arm_insn
, 25, 27);
12982 if (arm_record
->cond
== 0xf)
12983 ret
= arm_record_extension_space (arm_record
);
12986 /* If this insn has fallen into extension space
12987 then we need not decode it anymore. */
12988 ret
= arm_handle_insn
[insn_id
] (arm_record
);
12990 if (ret
!= ARM_RECORD_SUCCESS
)
12992 arm_record_unsupported_insn (arm_record
);
12996 else if (THUMB_RECORD
== record_type
)
12998 /* As thumb does not have condition codes, we set negative. */
12999 arm_record
->cond
= -1;
13000 insn_id
= bits (arm_record
->arm_insn
, 13, 15);
13001 ret
= thumb_handle_insn
[insn_id
] (arm_record
);
13002 if (ret
!= ARM_RECORD_SUCCESS
)
13004 arm_record_unsupported_insn (arm_record
);
13008 else if (THUMB2_RECORD
== record_type
)
13010 /* As thumb does not have condition codes, we set negative. */
13011 arm_record
->cond
= -1;
13013 /* Swap first half of 32bit thumb instruction with second half. */
13014 arm_record
->arm_insn
13015 = (arm_record
->arm_insn
>> 16) | (arm_record
->arm_insn
<< 16);
13017 ret
= thumb2_record_decode_insn_handler (arm_record
);
13019 if (ret
!= ARM_RECORD_SUCCESS
)
13021 arm_record_unsupported_insn (arm_record
);
13027 /* Throw assertion. */
13028 gdb_assert_not_reached ("not a valid instruction, could not decode");
13035 /* Cleans up local record registers and memory allocations. */
13038 deallocate_reg_mem (insn_decode_record
*record
)
13040 xfree (record
->arm_regs
);
13041 xfree (record
->arm_mems
);
13045 /* Parse the current instruction and record the values of the registers and
13046 memory that will be changed in current instruction to record_arch_list".
13047 Return -1 if something is wrong. */
13050 arm_process_record (struct gdbarch
*gdbarch
, struct regcache
*regcache
,
13051 CORE_ADDR insn_addr
)
13054 uint32_t no_of_rec
= 0;
13055 uint32_t ret
= 0; /* return value: -1:record failure ; 0:success */
13056 ULONGEST t_bit
= 0, insn_id
= 0;
13058 ULONGEST u_regval
= 0;
13060 insn_decode_record arm_record
;
13062 memset (&arm_record
, 0, sizeof (insn_decode_record
));
13063 arm_record
.regcache
= regcache
;
13064 arm_record
.this_addr
= insn_addr
;
13065 arm_record
.gdbarch
= gdbarch
;
13068 if (record_debug
> 1)
13070 fprintf_unfiltered (gdb_stdlog
, "Process record: arm_process_record "
13072 paddress (gdbarch
, arm_record
.this_addr
));
13075 if (extract_arm_insn (&arm_record
, 2))
13079 printf_unfiltered (_("Process record: error reading memory at "
13080 "addr %s len = %d.\n"),
13081 paddress (arm_record
.gdbarch
,
13082 arm_record
.this_addr
), 2);
13087 /* Check the insn, whether it is thumb or arm one. */
13089 t_bit
= arm_psr_thumb_bit (arm_record
.gdbarch
);
13090 regcache_raw_read_unsigned (arm_record
.regcache
, ARM_PS_REGNUM
, &u_regval
);
13093 if (!(u_regval
& t_bit
))
13095 /* We are decoding arm insn. */
13096 ret
= decode_insn (&arm_record
, ARM_RECORD
, ARM_INSN_SIZE_BYTES
);
13100 insn_id
= bits (arm_record
.arm_insn
, 11, 15);
13101 /* is it thumb2 insn? */
13102 if ((0x1D == insn_id
) || (0x1E == insn_id
) || (0x1F == insn_id
))
13104 ret
= decode_insn (&arm_record
, THUMB2_RECORD
,
13105 THUMB2_INSN_SIZE_BYTES
);
13109 /* We are decoding thumb insn. */
13110 ret
= decode_insn (&arm_record
, THUMB_RECORD
, THUMB_INSN_SIZE_BYTES
);
13116 /* Record registers. */
13117 record_full_arch_list_add_reg (arm_record
.regcache
, ARM_PC_REGNUM
);
13118 if (arm_record
.arm_regs
)
13120 for (no_of_rec
= 0; no_of_rec
< arm_record
.reg_rec_count
; no_of_rec
++)
13122 if (record_full_arch_list_add_reg
13123 (arm_record
.regcache
, arm_record
.arm_regs
[no_of_rec
]))
13127 /* Record memories. */
13128 if (arm_record
.arm_mems
)
13130 for (no_of_rec
= 0; no_of_rec
< arm_record
.mem_rec_count
; no_of_rec
++)
13132 if (record_full_arch_list_add_mem
13133 ((CORE_ADDR
)arm_record
.arm_mems
[no_of_rec
].addr
,
13134 arm_record
.arm_mems
[no_of_rec
].len
))
13139 if (record_full_arch_list_add_end ())
13144 deallocate_reg_mem (&arm_record
);