1 /* Target-dependent code for Morpho mt processor, for GDB.
3 Copyright (C) 2005-2016 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/>. */
20 /* Contributed by Michael Snyder, msnyder@redhat.com. */
24 #include "frame-unwind.h"
25 #include "frame-base.h"
28 #include "arch-utils.h"
31 #include "reggroups.h"
33 #include "trad-frame.h"
35 #include "dwarf2-frame.h"
40 enum mt_arch_constants
42 MT_MAX_STRUCT_SIZE
= 16
47 MT_R0_REGNUM
, /* 32 bit regs. */
49 MT_1ST_ARGREG
= MT_R1_REGNUM
,
53 MT_LAST_ARGREG
= MT_R4_REGNUM
,
62 MT_FP_REGNUM
= MT_R12_REGNUM
,
64 MT_SP_REGNUM
= MT_R13_REGNUM
,
66 MT_RA_REGNUM
= MT_R14_REGNUM
,
68 MT_IRA_REGNUM
= MT_R15_REGNUM
,
71 /* Interrupt Enable pseudo-register, exported by SID. */
73 /* End of CPU regs. */
77 /* Co-processor registers. */
78 MT_COPRO_REGNUM
= MT_NUM_CPU_REGS
, /* 16 bit regs. */
95 MT_BYPA_REGNUM
, /* 32 bit regs. */
99 MT_CONTEXT_REGNUM
, /* 38 bits (treat as array of
101 MT_MAC_REGNUM
, /* 32 bits. */
102 MT_Z1_REGNUM
, /* 16 bits. */
103 MT_Z2_REGNUM
, /* 16 bits. */
104 MT_ICHANNEL_REGNUM
, /* 32 bits. */
105 MT_ISCRAMB_REGNUM
, /* 32 bits. */
106 MT_QSCRAMB_REGNUM
, /* 32 bits. */
107 MT_OUT_REGNUM
, /* 16 bits. */
108 MT_EXMAC_REGNUM
, /* 32 bits (8 used). */
109 MT_QCHANNEL_REGNUM
, /* 32 bits. */
110 MT_ZI2_REGNUM
, /* 16 bits. */
111 MT_ZQ2_REGNUM
, /* 16 bits. */
112 MT_CHANNEL2_REGNUM
, /* 32 bits. */
113 MT_ISCRAMB2_REGNUM
, /* 32 bits. */
114 MT_QSCRAMB2_REGNUM
, /* 32 bits. */
115 MT_QCHANNEL2_REGNUM
, /* 32 bits. */
117 /* Number of real registers. */
120 /* Pseudo-registers. */
121 MT_COPRO_PSEUDOREG_REGNUM
= MT_NUM_REGS
,
122 MT_MAC_PSEUDOREG_REGNUM
,
123 MT_COPRO_PSEUDOREG_ARRAY
,
125 MT_COPRO_PSEUDOREG_DIM_1
= 2,
126 MT_COPRO_PSEUDOREG_DIM_2
= 8,
127 /* The number of pseudo-registers for each coprocessor. These
128 include the real coprocessor registers, the pseudo-registe for
129 the coprocessor number, and the pseudo-register for the MAC. */
130 MT_COPRO_PSEUDOREG_REGS
= MT_NUM_REGS
- MT_NUM_CPU_REGS
+ 2,
131 /* The register number of the MAC, relative to a given coprocessor. */
132 MT_COPRO_PSEUDOREG_MAC_REGNUM
= MT_COPRO_PSEUDOREG_REGS
- 1,
134 /* Two pseudo-regs ('coprocessor' and 'mac'). */
135 MT_NUM_PSEUDO_REGS
= 2 + (MT_COPRO_PSEUDOREG_REGS
136 * MT_COPRO_PSEUDOREG_DIM_1
137 * MT_COPRO_PSEUDOREG_DIM_2
)
140 /* The tdep structure. */
143 /* ISA-specific types. */
144 struct type
*copro_type
;
148 /* Return name of register number specified by REGNUM. */
151 mt_register_name (struct gdbarch
*gdbarch
, int regnum
)
153 static const char *const register_names
[] = {
155 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
156 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
158 /* Co-processor regs. */
159 "", /* copro register. */
160 "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7",
161 "cr8", "cr9", "cr10", "cr11", "cr12", "cr13", "cr14", "cr15",
162 "bypa", "bypb", "bypc", "flag", "context", "" /* mac. */ , "z1", "z2",
163 "Ichannel", "Iscramb", "Qscramb", "out", "" /* ex-mac. */ , "Qchannel",
164 "zi2", "zq2", "Ichannel2", "Iscramb2", "Qscramb2", "Qchannel2",
165 /* Pseudo-registers. */
168 static const char *array_names
[MT_COPRO_PSEUDOREG_REGS
169 * MT_COPRO_PSEUDOREG_DIM_1
170 * MT_COPRO_PSEUDOREG_DIM_2
];
174 if (regnum
< ARRAY_SIZE (register_names
))
175 return register_names
[regnum
];
176 if (array_names
[regnum
- MT_COPRO_PSEUDOREG_ARRAY
])
177 return array_names
[regnum
- MT_COPRO_PSEUDOREG_ARRAY
];
186 regnum
-= MT_COPRO_PSEUDOREG_ARRAY
;
187 index
= regnum
% MT_COPRO_PSEUDOREG_REGS
;
188 dim_2
= (regnum
/ MT_COPRO_PSEUDOREG_REGS
) % MT_COPRO_PSEUDOREG_DIM_2
;
189 dim_1
= ((regnum
/ MT_COPRO_PSEUDOREG_REGS
/ MT_COPRO_PSEUDOREG_DIM_2
)
190 % MT_COPRO_PSEUDOREG_DIM_1
);
192 if (index
== MT_COPRO_PSEUDOREG_MAC_REGNUM
)
193 stub
= register_names
[MT_MAC_PSEUDOREG_REGNUM
];
194 else if (index
>= MT_NUM_REGS
- MT_CPR0_REGNUM
)
197 stub
= register_names
[index
+ MT_CPR0_REGNUM
];
200 array_names
[regnum
] = stub
;
203 name
= (char *) xmalloc (30);
204 sprintf (name
, "copro_%d_%d_%s", dim_1
, dim_2
, stub
);
205 array_names
[regnum
] = name
;
210 /* Return the type of a coprocessor register. */
213 mt_copro_register_type (struct gdbarch
*arch
, int regnum
)
217 case MT_INT_ENABLE_REGNUM
:
218 case MT_ICHANNEL_REGNUM
:
219 case MT_QCHANNEL_REGNUM
:
220 case MT_ISCRAMB_REGNUM
:
221 case MT_QSCRAMB_REGNUM
:
222 return builtin_type (arch
)->builtin_int32
;
231 return builtin_type (arch
)->builtin_int16
;
232 case MT_EXMAC_REGNUM
:
234 return builtin_type (arch
)->builtin_uint32
;
235 case MT_CONTEXT_REGNUM
:
236 return builtin_type (arch
)->builtin_long_long
;
238 return builtin_type (arch
)->builtin_unsigned_char
;
240 if (regnum
>= MT_CPR0_REGNUM
&& regnum
<= MT_CPR15_REGNUM
)
241 return builtin_type (arch
)->builtin_int16
;
242 else if (regnum
== MT_CPR0_REGNUM
+ MT_COPRO_PSEUDOREG_MAC_REGNUM
)
244 if (gdbarch_bfd_arch_info (arch
)->mach
== bfd_mach_mrisc2
245 || gdbarch_bfd_arch_info (arch
)->mach
== bfd_mach_ms2
)
246 return builtin_type (arch
)->builtin_uint64
;
248 return builtin_type (arch
)->builtin_uint32
;
251 return builtin_type (arch
)->builtin_uint32
;
255 /* Given ARCH and a register number specified by REGNUM, return the
256 type of that register. */
259 mt_register_type (struct gdbarch
*arch
, int regnum
)
261 struct gdbarch_tdep
*tdep
= gdbarch_tdep (arch
);
263 if (regnum
>= 0 && regnum
< MT_NUM_REGS
+ MT_NUM_PSEUDO_REGS
)
270 return builtin_type (arch
)->builtin_func_ptr
;
273 return builtin_type (arch
)->builtin_data_ptr
;
274 case MT_COPRO_REGNUM
:
275 case MT_COPRO_PSEUDOREG_REGNUM
:
276 if (tdep
->copro_type
== NULL
)
278 struct type
*elt
= builtin_type (arch
)->builtin_int16
;
279 tdep
->copro_type
= lookup_array_range_type (elt
, 0, 1);
281 return tdep
->copro_type
;
282 case MT_MAC_PSEUDOREG_REGNUM
:
283 return mt_copro_register_type (arch
,
285 + MT_COPRO_PSEUDOREG_MAC_REGNUM
);
287 if (regnum
>= MT_R0_REGNUM
&& regnum
<= MT_R15_REGNUM
)
288 return builtin_type (arch
)->builtin_int32
;
289 else if (regnum
< MT_COPRO_PSEUDOREG_ARRAY
)
290 return mt_copro_register_type (arch
, regnum
);
293 regnum
-= MT_COPRO_PSEUDOREG_ARRAY
;
294 regnum
%= MT_COPRO_PSEUDOREG_REGS
;
295 regnum
+= MT_CPR0_REGNUM
;
296 return mt_copro_register_type (arch
, regnum
);
300 internal_error (__FILE__
, __LINE__
,
301 _("mt_register_type: illegal register number %d"), regnum
);
304 /* Return true if register REGNUM is a member of the register group
305 specified by GROUP. */
308 mt_register_reggroup_p (struct gdbarch
*gdbarch
, int regnum
,
309 struct reggroup
*group
)
311 /* Groups of registers that can be displayed via "info reg". */
312 if (group
== all_reggroup
)
314 && regnum
< MT_NUM_REGS
+ MT_NUM_PSEUDO_REGS
315 && mt_register_name (gdbarch
, regnum
)[0] != '\0');
317 if (group
== general_reggroup
)
318 return (regnum
>= MT_R0_REGNUM
&& regnum
<= MT_R15_REGNUM
);
320 if (group
== float_reggroup
)
321 return 0; /* No float regs. */
323 if (group
== vector_reggroup
)
324 return 0; /* No vector regs. */
326 /* For any that are not handled above. */
327 return default_register_reggroup_p (gdbarch
, regnum
, group
);
330 /* Return the return value convention used for a given type TYPE.
331 Optionally, fetch or set the return value via READBUF or
332 WRITEBUF respectively using REGCACHE for the register
335 static enum return_value_convention
336 mt_return_value (struct gdbarch
*gdbarch
, struct value
*function
,
337 struct type
*type
, struct regcache
*regcache
,
338 gdb_byte
*readbuf
, const gdb_byte
*writebuf
)
340 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
342 if (TYPE_LENGTH (type
) > 4)
344 /* Return values > 4 bytes are returned in memory,
345 pointed to by R11. */
350 regcache_cooked_read_unsigned (regcache
, MT_R11_REGNUM
, &addr
);
351 read_memory (addr
, readbuf
, TYPE_LENGTH (type
));
358 regcache_cooked_read_unsigned (regcache
, MT_R11_REGNUM
, &addr
);
359 write_memory (addr
, writebuf
, TYPE_LENGTH (type
));
362 return RETURN_VALUE_ABI_RETURNS_ADDRESS
;
370 /* Return values of <= 4 bytes are returned in R11. */
371 regcache_cooked_read_unsigned (regcache
, MT_R11_REGNUM
, &temp
);
372 store_unsigned_integer (readbuf
, TYPE_LENGTH (type
),
378 if (TYPE_LENGTH (type
) < 4)
381 /* Add leading zeros to the value. */
382 memset (buf
, 0, sizeof (buf
));
383 memcpy (buf
+ sizeof (buf
) - TYPE_LENGTH (type
),
384 writebuf
, TYPE_LENGTH (type
));
385 regcache_cooked_write (regcache
, MT_R11_REGNUM
, buf
);
387 else /* (TYPE_LENGTH (type) == 4 */
388 regcache_cooked_write (regcache
, MT_R11_REGNUM
, writebuf
);
391 return RETURN_VALUE_REGISTER_CONVENTION
;
395 /* If the input address, PC, is in a function prologue, return the
396 address of the end of the prologue, otherwise return the input
399 Note: PC is likely to be the function start, since this function
400 is mainly used for advancing a breakpoint to the first line, or
401 stepping to the first line when we have stepped into a function
405 mt_skip_prologue (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
407 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
408 CORE_ADDR func_addr
= 0, func_end
= 0;
409 const char *func_name
;
412 if (find_pc_partial_function (pc
, &func_name
, &func_addr
, &func_end
))
414 struct symtab_and_line sal
;
417 /* Found a function. */
418 sym
= lookup_symbol (func_name
, NULL
, VAR_DOMAIN
, NULL
).symbol
;
419 if (sym
&& SYMBOL_LANGUAGE (sym
) != language_asm
)
421 /* Don't use this trick for assembly source files. */
422 sal
= find_pc_line (func_addr
, 0);
424 if (sal
.end
&& sal
.end
< func_end
)
426 /* Found a line number, use it as end of prologue. */
432 /* No function symbol, or no line symbol. Use prologue scanning method. */
435 instr
= read_memory_unsigned_integer (pc
, 4, byte_order
);
436 if (instr
== 0x12000000) /* nop */
438 if (instr
== 0x12ddc000) /* copy sp into fp */
441 if (instr
== 0x05dd) /* subi sp, sp, imm */
443 if (instr
>= 0x43c0 && instr
<= 0x43df) /* push */
445 /* Not an obvious prologue instruction. */
453 mt_breakpoint_kind_from_pc (struct gdbarch
*gdbarch
, CORE_ADDR
*pcptr
)
458 static const gdb_byte
*
459 mt_sw_breakpoint_from_kind (struct gdbarch
*gdbarch
, int kind
, int *size
)
461 /* The breakpoint instruction must be the same size as the smallest
462 instruction in the instruction set.
464 The BP for ms1 is defined as 0x68000000 (BREAK).
465 The BP for ms2 is defined as 0x69000000 (illegal). */
466 static gdb_byte ms1_breakpoint
[] = { 0x68, 0, 0, 0 };
467 static gdb_byte ms2_breakpoint
[] = { 0x69, 0, 0, 0 };
471 if (gdbarch_bfd_arch_info (gdbarch
)->mach
== bfd_mach_ms2
)
472 return ms2_breakpoint
;
474 return ms1_breakpoint
;
477 GDBARCH_BREAKPOINT_FROM_PC (mt
)
479 /* Select the correct coprocessor register bank. Return the pseudo
480 regnum we really want to read. */
483 mt_select_coprocessor (struct gdbarch
*gdbarch
,
484 struct regcache
*regcache
, int regno
)
486 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
487 unsigned index
, base
;
490 /* Get the copro pseudo regnum. */
491 regcache_raw_read (regcache
, MT_COPRO_REGNUM
, copro
);
492 base
= ((extract_signed_integer (&copro
[0], 2, byte_order
)
493 * MT_COPRO_PSEUDOREG_DIM_2
)
494 + extract_signed_integer (&copro
[2], 2, byte_order
));
496 regno
-= MT_COPRO_PSEUDOREG_ARRAY
;
497 index
= regno
% MT_COPRO_PSEUDOREG_REGS
;
498 regno
/= MT_COPRO_PSEUDOREG_REGS
;
501 /* Select the correct coprocessor register bank. Invalidate the
502 coprocessor register cache. */
505 store_signed_integer (&copro
[0], 2, byte_order
,
506 regno
/ MT_COPRO_PSEUDOREG_DIM_2
);
507 store_signed_integer (&copro
[2], 2, byte_order
,
508 regno
% MT_COPRO_PSEUDOREG_DIM_2
);
509 regcache_raw_write (regcache
, MT_COPRO_REGNUM
, copro
);
511 /* We must flush the cache, as it is now invalid. */
512 for (ix
= MT_NUM_CPU_REGS
; ix
!= MT_NUM_REGS
; ix
++)
513 regcache_invalidate (regcache
, ix
);
519 /* Fetch the pseudo registers:
521 There are two regular pseudo-registers:
522 1) The 'coprocessor' pseudo-register (which mirrors the
523 "real" coprocessor register sent by the target), and
524 2) The 'MAC' pseudo-register (which represents the union
525 of the original 32 bit target MAC register and the new
526 8-bit extended-MAC register).
528 Additionally there is an array of coprocessor registers which track
529 the coprocessor registers for each coprocessor. */
531 static enum register_status
532 mt_pseudo_register_read (struct gdbarch
*gdbarch
,
533 struct regcache
*regcache
, int regno
, gdb_byte
*buf
)
535 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
539 case MT_COPRO_REGNUM
:
540 case MT_COPRO_PSEUDOREG_REGNUM
:
541 return regcache_raw_read (regcache
, MT_COPRO_REGNUM
, buf
);
543 case MT_MAC_PSEUDOREG_REGNUM
:
544 if (gdbarch_bfd_arch_info (gdbarch
)->mach
== bfd_mach_mrisc2
545 || gdbarch_bfd_arch_info (gdbarch
)->mach
== bfd_mach_ms2
)
547 enum register_status status
;
548 ULONGEST oldmac
= 0, ext_mac
= 0;
551 status
= regcache_cooked_read_unsigned (regcache
, MT_MAC_REGNUM
, &oldmac
);
552 if (status
!= REG_VALID
)
555 regcache_cooked_read_unsigned (regcache
, MT_EXMAC_REGNUM
, &ext_mac
);
556 if (status
!= REG_VALID
)
560 (oldmac
& 0xffffffff) | ((long long) (ext_mac
& 0xff) << 32);
561 store_signed_integer (buf
, 8, byte_order
, newmac
);
566 return regcache_raw_read (regcache
, MT_MAC_REGNUM
, buf
);
570 unsigned index
= mt_select_coprocessor (gdbarch
, regcache
, regno
);
572 if (index
== MT_COPRO_PSEUDOREG_MAC_REGNUM
)
573 return mt_pseudo_register_read (gdbarch
, regcache
,
574 MT_MAC_PSEUDOREG_REGNUM
, buf
);
575 else if (index
< MT_NUM_REGS
- MT_CPR0_REGNUM
)
576 return regcache_raw_read (regcache
, index
+ MT_CPR0_REGNUM
, buf
);
585 /* Write the pseudo registers:
587 Mt pseudo-registers are stored directly to the target. The
588 'coprocessor' register is special, because when it is modified, all
589 the other coprocessor regs must be flushed from the reg cache. */
592 mt_pseudo_register_write (struct gdbarch
*gdbarch
,
593 struct regcache
*regcache
,
594 int regno
, const gdb_byte
*buf
)
596 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
601 case MT_COPRO_REGNUM
:
602 case MT_COPRO_PSEUDOREG_REGNUM
:
603 regcache_raw_write (regcache
, MT_COPRO_REGNUM
, buf
);
604 for (i
= MT_NUM_CPU_REGS
; i
< MT_NUM_REGS
; i
++)
605 regcache_invalidate (regcache
, i
);
608 case MT_MAC_PSEUDOREG_REGNUM
:
609 if (gdbarch_bfd_arch_info (gdbarch
)->mach
== bfd_mach_mrisc2
610 || gdbarch_bfd_arch_info (gdbarch
)->mach
== bfd_mach_ms2
)
612 /* The 8-byte MAC pseudo-register must be broken down into two
613 32-byte registers. */
614 unsigned int oldmac
, ext_mac
;
617 newmac
= extract_unsigned_integer (buf
, 8, byte_order
);
618 oldmac
= newmac
& 0xffffffff;
619 ext_mac
= (newmac
>> 32) & 0xff;
620 regcache_cooked_write_unsigned (regcache
, MT_MAC_REGNUM
, oldmac
);
621 regcache_cooked_write_unsigned (regcache
, MT_EXMAC_REGNUM
, ext_mac
);
624 regcache_raw_write (regcache
, MT_MAC_REGNUM
, buf
);
628 unsigned index
= mt_select_coprocessor (gdbarch
, regcache
, regno
);
630 if (index
== MT_COPRO_PSEUDOREG_MAC_REGNUM
)
631 mt_pseudo_register_write (gdbarch
, regcache
,
632 MT_MAC_PSEUDOREG_REGNUM
, buf
);
633 else if (index
< MT_NUM_REGS
- MT_CPR0_REGNUM
)
634 regcache_raw_write (regcache
, index
+ MT_CPR0_REGNUM
, buf
);
641 mt_frame_align (struct gdbarch
*gdbarch
, CORE_ADDR sp
)
643 /* Register size is 4 bytes. */
644 return align_down (sp
, 4);
647 /* Implements the "info registers" command. When ``all'' is non-zero,
648 the coprocessor registers will be printed in addition to the rest
652 mt_registers_info (struct gdbarch
*gdbarch
,
653 struct ui_file
*file
,
654 struct frame_info
*frame
, int regnum
, int all
)
656 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
662 lim
= all
? MT_NUM_REGS
: MT_NUM_CPU_REGS
;
664 for (regnum
= 0; regnum
< lim
; regnum
++)
666 /* Don't display the Qchannel register since it will be displayed
667 along with Ichannel. (See below.) */
668 if (regnum
== MT_QCHANNEL_REGNUM
)
671 mt_registers_info (gdbarch
, file
, frame
, regnum
, all
);
673 /* Display the Qchannel register immediately after Ichannel. */
674 if (regnum
== MT_ICHANNEL_REGNUM
)
675 mt_registers_info (gdbarch
, file
, frame
, MT_QCHANNEL_REGNUM
, all
);
680 if (regnum
== MT_EXMAC_REGNUM
)
682 else if (regnum
== MT_CONTEXT_REGNUM
)
684 /* Special output handling for 38-bit context register. */
686 unsigned int i
, regsize
;
688 regsize
= register_size (gdbarch
, regnum
);
690 buff
= (unsigned char *) alloca (regsize
);
692 deprecated_frame_register_read (frame
, regnum
, buff
);
694 fputs_filtered (gdbarch_register_name
695 (gdbarch
, regnum
), file
);
696 print_spaces_filtered (15 - strlen (gdbarch_register_name
699 fputs_filtered ("0x", file
);
701 for (i
= 0; i
< regsize
; i
++)
702 fprintf_filtered (file
, "%02x", (unsigned int)
703 extract_unsigned_integer (buff
+ i
, 1, byte_order
));
704 fputs_filtered ("\t", file
);
705 print_longest (file
, 'd', 0,
706 extract_unsigned_integer (buff
, regsize
, byte_order
));
707 fputs_filtered ("\n", file
);
709 else if (regnum
== MT_COPRO_REGNUM
710 || regnum
== MT_COPRO_PSEUDOREG_REGNUM
)
712 /* Special output handling for the 'coprocessor' register. */
714 struct value_print_options opts
;
716 buf
= (gdb_byte
*) alloca (register_size (gdbarch
, MT_COPRO_REGNUM
));
717 deprecated_frame_register_read (frame
, MT_COPRO_REGNUM
, buf
);
719 regnum
= MT_COPRO_PSEUDOREG_REGNUM
;
720 fputs_filtered (gdbarch_register_name (gdbarch
, regnum
),
722 print_spaces_filtered (15 - strlen (gdbarch_register_name
725 get_no_prettyformat_print_options (&opts
);
727 val_print (register_type (gdbarch
, regnum
), buf
,
729 &opts
, current_language
);
730 fputs_filtered ("\n", file
);
732 else if (regnum
== MT_MAC_REGNUM
|| regnum
== MT_MAC_PSEUDOREG_REGNUM
)
734 ULONGEST oldmac
, ext_mac
, newmac
;
735 gdb_byte buf
[3 * sizeof (LONGEST
)];
737 /* Get the two "real" mac registers. */
738 deprecated_frame_register_read (frame
, MT_MAC_REGNUM
, buf
);
739 oldmac
= extract_unsigned_integer
740 (buf
, register_size (gdbarch
, MT_MAC_REGNUM
), byte_order
);
741 if (gdbarch_bfd_arch_info (gdbarch
)->mach
== bfd_mach_mrisc2
742 || gdbarch_bfd_arch_info (gdbarch
)->mach
== bfd_mach_ms2
)
744 deprecated_frame_register_read (frame
, MT_EXMAC_REGNUM
, buf
);
745 ext_mac
= extract_unsigned_integer
746 (buf
, register_size (gdbarch
, MT_EXMAC_REGNUM
), byte_order
);
751 /* Add them together. */
752 newmac
= (oldmac
& 0xffffffff) + ((ext_mac
& 0xff) << 32);
755 regnum
= MT_MAC_PSEUDOREG_REGNUM
;
756 fputs_filtered (gdbarch_register_name (gdbarch
, regnum
),
758 print_spaces_filtered (15 - strlen (gdbarch_register_name
761 fputs_filtered ("0x", file
);
762 print_longest (file
, 'x', 0, newmac
);
763 fputs_filtered ("\t", file
);
764 print_longest (file
, 'u', 0, newmac
);
765 fputs_filtered ("\n", file
);
768 default_print_registers_info (gdbarch
, file
, frame
, regnum
, all
);
772 /* Set up the callee's arguments for an inferior function call. The
773 arguments are pushed on the stack or are placed in registers as
774 appropriate. It also sets up the return address (which points to
775 the call dummy breakpoint).
777 Returns the updated (and aligned) stack pointer. */
780 mt_push_dummy_call (struct gdbarch
*gdbarch
, struct value
*function
,
781 struct regcache
*regcache
, CORE_ADDR bp_addr
,
782 int nargs
, struct value
**args
, CORE_ADDR sp
,
783 int struct_return
, CORE_ADDR struct_addr
)
786 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
787 gdb_byte buf
[MT_MAX_STRUCT_SIZE
];
788 int argreg
= MT_1ST_ARGREG
;
789 int split_param_len
= 0;
795 /* First handle however many args we can fit into MT_1ST_ARGREG thru
797 for (i
= 0; i
< nargs
&& argreg
<= MT_LAST_ARGREG
; i
++)
800 typelen
= TYPE_LENGTH (value_type (args
[i
]));
807 regcache_cooked_write_unsigned (regcache
, argreg
++,
808 extract_unsigned_integer
809 (value_contents (args
[i
]),
810 wordsize
, byte_order
));
815 val
= value_contents (args
[i
]);
818 if (argreg
<= MT_LAST_ARGREG
)
820 /* This word of the argument is passed in a register. */
821 regcache_cooked_write_unsigned (regcache
, argreg
++,
822 extract_unsigned_integer
823 (val
, wordsize
, byte_order
));
829 /* Remainder of this arg must be passed on the stack
830 (deferred to do later). */
831 split_param_len
= typelen
;
832 memcpy (buf
, val
, typelen
);
833 break; /* No more args can be handled in regs. */
838 /* By reverse engineering of gcc output, args bigger than
839 16 bytes go on the stack, and their address is passed
841 stack_dest
-= typelen
;
842 write_memory (stack_dest
, value_contents (args
[i
]), typelen
);
843 regcache_cooked_write_unsigned (regcache
, argreg
++, stack_dest
);
848 /* Next, the rest of the arguments go onto the stack, in reverse order. */
849 for (j
= nargs
- 1; j
>= i
; j
--)
852 struct cleanup
*back_to
;
853 const gdb_byte
*contents
= value_contents (args
[j
]);
855 /* Right-justify the value in an aligned-length buffer. */
856 typelen
= TYPE_LENGTH (value_type (args
[j
]));
857 slacklen
= (wordsize
- (typelen
% wordsize
)) % wordsize
;
858 val
= (gdb_byte
*) xmalloc (typelen
+ slacklen
);
859 back_to
= make_cleanup (xfree
, val
);
860 memcpy (val
, contents
, typelen
);
861 memset (val
+ typelen
, 0, slacklen
);
862 /* Now write this data to the stack. */
863 stack_dest
-= typelen
+ slacklen
;
864 write_memory (stack_dest
, val
, typelen
+ slacklen
);
865 do_cleanups (back_to
);
868 /* Finally, if a param needs to be split between registers and stack,
869 write the second half to the stack now. */
870 if (split_param_len
!= 0)
872 stack_dest
-= split_param_len
;
873 write_memory (stack_dest
, buf
, split_param_len
);
876 /* Set up return address (provided to us as bp_addr). */
877 regcache_cooked_write_unsigned (regcache
, MT_RA_REGNUM
, bp_addr
);
879 /* Store struct return address, if given. */
880 if (struct_return
&& struct_addr
!= 0)
881 regcache_cooked_write_unsigned (regcache
, MT_R11_REGNUM
, struct_addr
);
883 /* Set aside 16 bytes for the callee to save regs 1-4. */
886 /* Update the stack pointer. */
887 regcache_cooked_write_unsigned (regcache
, MT_SP_REGNUM
, stack_dest
);
889 /* And that should do it. Return the new stack pointer. */
894 /* The 'unwind_cache' data structure. */
896 struct mt_unwind_cache
898 /* The previous frame's inner most stack address.
899 Used as this frame ID's stack_addr. */
901 CORE_ADDR frame_base
;
905 /* Table indicating the location of each and every register. */
906 struct trad_frame_saved_reg
*saved_regs
;
909 /* Initialize an unwind_cache. Build up the saved_regs table etc. for
912 static struct mt_unwind_cache
*
913 mt_frame_unwind_cache (struct frame_info
*this_frame
,
914 void **this_prologue_cache
)
916 struct gdbarch
*gdbarch
;
917 struct mt_unwind_cache
*info
;
918 CORE_ADDR next_addr
, start_addr
, end_addr
, prologue_end_addr
;
919 unsigned long instr
, upper_half
, delayed_store
= 0;
923 if ((*this_prologue_cache
))
924 return (struct mt_unwind_cache
*) (*this_prologue_cache
);
926 gdbarch
= get_frame_arch (this_frame
);
927 info
= FRAME_OBSTACK_ZALLOC (struct mt_unwind_cache
);
928 (*this_prologue_cache
) = info
;
932 info
->frame_base
= 0;
933 info
->frameless_p
= 1;
934 info
->saved_regs
= trad_frame_alloc_saved_regs (this_frame
);
936 /* Grab the frame-relative values of SP and FP, needed below.
937 The frame_saved_register function will find them on the
938 stack or in the registers as appropriate. */
939 sp
= get_frame_register_unsigned (this_frame
, MT_SP_REGNUM
);
940 fp
= get_frame_register_unsigned (this_frame
, MT_FP_REGNUM
);
942 start_addr
= get_frame_func (this_frame
);
944 /* Return early if GDB couldn't find the function. */
948 end_addr
= get_frame_pc (this_frame
);
949 prologue_end_addr
= skip_prologue_using_sal (gdbarch
, start_addr
);
951 for (next_addr
= start_addr
; next_addr
< end_addr
; next_addr
+= 4)
953 instr
= get_frame_memory_unsigned (this_frame
, next_addr
, 4);
954 if (delayed_store
) /* Previous instr was a push. */
956 upper_half
= delayed_store
>> 16;
957 regnum
= upper_half
& 0xf;
958 offset
= delayed_store
& 0xffff;
959 switch (upper_half
& 0xfff0)
961 case 0x43c0: /* push using frame pointer. */
962 info
->saved_regs
[regnum
].addr
= offset
;
964 case 0x43d0: /* push using stack pointer. */
965 info
->saved_regs
[regnum
].addr
= offset
;
975 case 0x12000000: /* NO-OP */
977 case 0x12ddc000: /* copy sp into fp */
978 info
->frameless_p
= 0; /* Record that the frame
979 pointer is in use. */
982 upper_half
= instr
>> 16;
983 if (upper_half
== 0x05dd || /* subi sp, sp, imm */
984 upper_half
== 0x07dd) /* subui sp, sp, imm */
986 /* Record the frame size. */
987 info
->framesize
= instr
& 0xffff;
990 if ((upper_half
& 0xfff0) == 0x43c0 || /* frame push */
991 (upper_half
& 0xfff0) == 0x43d0) /* stack push */
993 /* Save this instruction, but don't record the
994 pushed register as 'saved' until we see the
995 next instruction. That's because of deferred stores
996 on this target -- GDB won't be able to read the register
997 from the stack until one instruction later. */
998 delayed_store
= instr
;
1001 /* Not a prologue instruction. Is this the end of the prologue?
1002 This is the most difficult decision; when to stop scanning.
1004 If we have no line symbol, then the best thing we can do
1005 is to stop scanning when we encounter an instruction that
1006 is not likely to be a part of the prologue.
1008 But if we do have a line symbol, then we should
1009 keep scanning until we reach it (or we reach end_addr). */
1011 if (prologue_end_addr
&& (prologue_end_addr
> (next_addr
+ 4)))
1012 continue; /* Keep scanning, recording saved_regs etc. */
1014 break; /* Quit scanning: breakpoint can be set here. */
1018 /* Special handling for the "saved" address of the SP:
1019 The SP is of course never saved on the stack at all, so
1020 by convention what we put here is simply the previous
1021 _value_ of the SP (as opposed to an address where the
1022 previous value would have been pushed). This will also
1023 give us the frame base address. */
1025 if (info
->frameless_p
)
1027 info
->frame_base
= sp
+ info
->framesize
;
1028 info
->prev_sp
= sp
+ info
->framesize
;
1032 info
->frame_base
= fp
+ info
->framesize
;
1033 info
->prev_sp
= fp
+ info
->framesize
;
1035 /* Save prev_sp in saved_regs as a value, not as an address. */
1036 trad_frame_set_value (info
->saved_regs
, MT_SP_REGNUM
, info
->prev_sp
);
1038 /* Now convert frame offsets to actual addresses (not offsets). */
1039 for (regnum
= 0; regnum
< MT_NUM_REGS
; regnum
++)
1040 if (trad_frame_addr_p (info
->saved_regs
, regnum
))
1041 info
->saved_regs
[regnum
].addr
+= info
->frame_base
- info
->framesize
;
1043 /* The call instruction moves the caller's PC in the callee's RA reg.
1044 Since this is an unwind, do the reverse. Copy the location of RA
1045 into PC (the address / regnum) so that a request for PC will be
1046 converted into a request for the RA. */
1047 info
->saved_regs
[MT_PC_REGNUM
] = info
->saved_regs
[MT_RA_REGNUM
];
1053 mt_unwind_pc (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
1057 pc
= frame_unwind_register_unsigned (next_frame
, MT_PC_REGNUM
);
1062 mt_unwind_sp (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
1066 sp
= frame_unwind_register_unsigned (next_frame
, MT_SP_REGNUM
);
1070 /* Assuming THIS_FRAME is a dummy, return the frame ID of that dummy
1071 frame. The frame ID's base needs to match the TOS value saved by
1072 save_dummy_frame_tos(), and the PC match the dummy frame's breakpoint. */
1074 static struct frame_id
1075 mt_dummy_id (struct gdbarch
*gdbarch
, struct frame_info
*this_frame
)
1077 CORE_ADDR sp
= get_frame_register_unsigned (this_frame
, MT_SP_REGNUM
);
1078 return frame_id_build (sp
, get_frame_pc (this_frame
));
1081 /* Given a GDB frame, determine the address of the calling function's
1082 frame. This will be used to create a new GDB frame struct. */
1085 mt_frame_this_id (struct frame_info
*this_frame
,
1086 void **this_prologue_cache
, struct frame_id
*this_id
)
1088 struct mt_unwind_cache
*info
=
1089 mt_frame_unwind_cache (this_frame
, this_prologue_cache
);
1091 if (!(info
== NULL
|| info
->prev_sp
== 0))
1092 (*this_id
) = frame_id_build (info
->prev_sp
, get_frame_func (this_frame
));
1097 static struct value
*
1098 mt_frame_prev_register (struct frame_info
*this_frame
,
1099 void **this_prologue_cache
, int regnum
)
1101 struct mt_unwind_cache
*info
=
1102 mt_frame_unwind_cache (this_frame
, this_prologue_cache
);
1104 return trad_frame_get_prev_register (this_frame
, info
->saved_regs
, regnum
);
1108 mt_frame_base_address (struct frame_info
*this_frame
,
1109 void **this_prologue_cache
)
1111 struct mt_unwind_cache
*info
=
1112 mt_frame_unwind_cache (this_frame
, this_prologue_cache
);
1114 return info
->frame_base
;
1117 /* This is a shared interface: the 'frame_unwind' object is what's
1118 returned by the 'sniffer' function, and in turn specifies how to
1119 get a frame's ID and prev_regs.
1121 This exports the 'prev_register' and 'this_id' methods. */
1123 static const struct frame_unwind mt_frame_unwind
= {
1125 default_frame_unwind_stop_reason
,
1127 mt_frame_prev_register
,
1129 default_frame_sniffer
1132 /* Another shared interface: the 'frame_base' object specifies how to
1133 unwind a frame and secure the base addresses for frame objects
1136 static struct frame_base mt_frame_base
= {
1138 mt_frame_base_address
,
1139 mt_frame_base_address
,
1140 mt_frame_base_address
1143 static struct gdbarch
*
1144 mt_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
1146 struct gdbarch
*gdbarch
;
1147 struct gdbarch_tdep
*tdep
;
1149 /* Find a candidate among the list of pre-declared architectures. */
1150 arches
= gdbarch_list_lookup_by_info (arches
, &info
);
1152 return arches
->gdbarch
;
1154 /* None found, create a new architecture from the information
1156 tdep
= XCNEW (struct gdbarch_tdep
);
1157 gdbarch
= gdbarch_alloc (&info
, tdep
);
1159 set_gdbarch_float_format (gdbarch
, floatformats_ieee_single
);
1160 set_gdbarch_double_format (gdbarch
, floatformats_ieee_double
);
1161 set_gdbarch_long_double_format (gdbarch
, floatformats_ieee_double
);
1163 set_gdbarch_register_name (gdbarch
, mt_register_name
);
1164 set_gdbarch_num_regs (gdbarch
, MT_NUM_REGS
);
1165 set_gdbarch_num_pseudo_regs (gdbarch
, MT_NUM_PSEUDO_REGS
);
1166 set_gdbarch_pc_regnum (gdbarch
, MT_PC_REGNUM
);
1167 set_gdbarch_sp_regnum (gdbarch
, MT_SP_REGNUM
);
1168 set_gdbarch_pseudo_register_read (gdbarch
, mt_pseudo_register_read
);
1169 set_gdbarch_pseudo_register_write (gdbarch
, mt_pseudo_register_write
);
1170 set_gdbarch_skip_prologue (gdbarch
, mt_skip_prologue
);
1171 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
1172 SET_GDBARCH_BREAKPOINT_MANIPULATION (mt
);
1173 set_gdbarch_decr_pc_after_break (gdbarch
, 0);
1174 set_gdbarch_frame_args_skip (gdbarch
, 0);
1175 set_gdbarch_print_insn (gdbarch
, print_insn_mt
);
1176 set_gdbarch_register_type (gdbarch
, mt_register_type
);
1177 set_gdbarch_register_reggroup_p (gdbarch
, mt_register_reggroup_p
);
1179 set_gdbarch_return_value (gdbarch
, mt_return_value
);
1180 set_gdbarch_sp_regnum (gdbarch
, MT_SP_REGNUM
);
1182 set_gdbarch_frame_align (gdbarch
, mt_frame_align
);
1184 set_gdbarch_print_registers_info (gdbarch
, mt_registers_info
);
1186 set_gdbarch_push_dummy_call (gdbarch
, mt_push_dummy_call
);
1188 /* Target builtin data types. */
1189 set_gdbarch_short_bit (gdbarch
, 16);
1190 set_gdbarch_int_bit (gdbarch
, 32);
1191 set_gdbarch_long_bit (gdbarch
, 32);
1192 set_gdbarch_long_long_bit (gdbarch
, 64);
1193 set_gdbarch_float_bit (gdbarch
, 32);
1194 set_gdbarch_double_bit (gdbarch
, 64);
1195 set_gdbarch_long_double_bit (gdbarch
, 64);
1196 set_gdbarch_ptr_bit (gdbarch
, 32);
1198 /* Register the DWARF 2 sniffer first, and then the traditional prologue
1200 dwarf2_append_unwinders (gdbarch
);
1201 frame_unwind_append_unwinder (gdbarch
, &mt_frame_unwind
);
1202 frame_base_set_default (gdbarch
, &mt_frame_base
);
1204 /* Register the 'unwind_pc' method. */
1205 set_gdbarch_unwind_pc (gdbarch
, mt_unwind_pc
);
1206 set_gdbarch_unwind_sp (gdbarch
, mt_unwind_sp
);
1208 /* Methods for saving / extracting a dummy frame's ID.
1209 The ID's stack address must match the SP value returned by
1210 PUSH_DUMMY_CALL, and saved by generic_save_dummy_frame_tos. */
1211 set_gdbarch_dummy_id (gdbarch
, mt_dummy_id
);
1216 /* Provide a prototype to silence -Wmissing-prototypes. */
1217 extern initialize_file_ftype _initialize_mt_tdep
;
1220 _initialize_mt_tdep (void)
1222 register_gdbarch_init (bfd_arch_mt
, mt_gdbarch_init
);