1 /* Target-dependent code for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
32 #include "arch-utils.h"
37 #include "bfd/libbfd.h" /* for bfd_default_set_arch_mach */
38 #include "coff/internal.h" /* for libcoff.h */
39 #include "bfd/libcoff.h" /* for xcoff_data */
43 #include "solib-svr4.h"
46 /* If the kernel has to deliver a signal, it pushes a sigcontext
47 structure on the stack and then calls the signal handler, passing
48 the address of the sigcontext in an argument register. Usually
49 the signal handler doesn't save this register, so we have to
50 access the sigcontext structure via an offset from the signal handler
52 The following constants were determined by experimentation on AIX 3.2. */
53 #define SIG_FRAME_PC_OFFSET 96
54 #define SIG_FRAME_LR_OFFSET 108
55 #define SIG_FRAME_FP_OFFSET 284
57 /* To be used by skip_prologue. */
59 struct rs6000_framedata
61 int offset
; /* total size of frame --- the distance
62 by which we decrement sp to allocate
64 int saved_gpr
; /* smallest # of saved gpr */
65 int saved_fpr
; /* smallest # of saved fpr */
66 int alloca_reg
; /* alloca register number (frame ptr) */
67 char frameless
; /* true if frameless functions. */
68 char nosavedpc
; /* true if pc not saved. */
69 int gpr_offset
; /* offset of saved gprs from prev sp */
70 int fpr_offset
; /* offset of saved fprs from prev sp */
71 int lr_offset
; /* offset of saved lr */
72 int cr_offset
; /* offset of saved cr */
75 /* Description of a single register. */
79 char *name
; /* name of register */
80 unsigned char sz32
; /* size on 32-bit arch, 0 if nonextant */
81 unsigned char sz64
; /* size on 64-bit arch, 0 if nonextant */
82 unsigned char fpr
; /* whether register is floating-point */
85 /* Private data that this module attaches to struct gdbarch. */
89 int wordsize
; /* size in bytes of fixed-point word */
90 int osabi
; /* OS / ABI from ELF header */
91 int *regoff
; /* byte offsets in register arrays */
92 const struct reg
*regs
; /* from current variant */
95 /* Return the current architecture's gdbarch_tdep structure. */
97 #define TDEP gdbarch_tdep (current_gdbarch)
99 /* Breakpoint shadows for the single step instructions will be kept here. */
101 static struct sstep_breaks
103 /* Address, or 0 if this is not in use. */
105 /* Shadow contents. */
110 /* Hook for determining the TOC address when calling functions in the
111 inferior under AIX. The initialization code in rs6000-nat.c sets
112 this hook to point to find_toc_address. */
114 CORE_ADDR (*rs6000_find_toc_address_hook
) (CORE_ADDR
) = NULL
;
116 /* Hook to set the current architecture when starting a child process.
117 rs6000-nat.c sets this. */
119 void (*rs6000_set_host_arch_hook
) (int) = NULL
;
121 /* Static function prototypes */
123 static CORE_ADDR
branch_dest (int opcode
, int instr
, CORE_ADDR pc
,
125 static CORE_ADDR
skip_prologue (CORE_ADDR
, CORE_ADDR
,
126 struct rs6000_framedata
*);
127 static void frame_get_saved_regs (struct frame_info
* fi
,
128 struct rs6000_framedata
* fdatap
);
129 static CORE_ADDR
frame_initial_stack_address (struct frame_info
*);
131 /* Read a LEN-byte address from debugged memory address MEMADDR. */
134 read_memory_addr (CORE_ADDR memaddr
, int len
)
136 return read_memory_unsigned_integer (memaddr
, len
);
140 rs6000_skip_prologue (CORE_ADDR pc
)
142 struct rs6000_framedata frame
;
143 pc
= skip_prologue (pc
, 0, &frame
);
148 /* Fill in fi->saved_regs */
150 struct frame_extra_info
152 /* Functions calling alloca() change the value of the stack
153 pointer. We need to use initial stack pointer (which is saved in
154 r31 by gcc) in such cases. If a compiler emits traceback table,
155 then we should use the alloca register specified in traceback
157 CORE_ADDR initial_sp
; /* initial stack pointer. */
161 rs6000_init_extra_frame_info (int fromleaf
, struct frame_info
*fi
)
163 fi
->extra_info
= (struct frame_extra_info
*)
164 frame_obstack_alloc (sizeof (struct frame_extra_info
));
165 fi
->extra_info
->initial_sp
= 0;
166 if (fi
->next
!= (CORE_ADDR
) 0
167 && fi
->pc
< TEXT_SEGMENT_BASE
)
168 /* We're in get_prev_frame */
169 /* and this is a special signal frame. */
170 /* (fi->pc will be some low address in the kernel, */
171 /* to which the signal handler returns). */
172 fi
->signal_handler_caller
= 1;
175 /* Put here the code to store, into a struct frame_saved_regs,
176 the addresses of the saved registers of frame described by FRAME_INFO.
177 This includes special registers such as pc and fp saved in special
178 ways in the stack frame. sp is even more special:
179 the address we return for it IS the sp for the next frame. */
181 /* In this implementation for RS/6000, we do *not* save sp. I am
182 not sure if it will be needed. The following function takes care of gpr's
186 rs6000_frame_init_saved_regs (struct frame_info
*fi
)
188 frame_get_saved_regs (fi
, NULL
);
192 rs6000_frame_args_address (struct frame_info
*fi
)
194 if (fi
->extra_info
->initial_sp
!= 0)
195 return fi
->extra_info
->initial_sp
;
197 return frame_initial_stack_address (fi
);
200 /* Immediately after a function call, return the saved pc.
201 Can't go through the frames for this because on some machines
202 the new frame is not set up until the new function executes
203 some instructions. */
206 rs6000_saved_pc_after_call (struct frame_info
*fi
)
208 return read_register (PPC_LR_REGNUM
);
211 /* Calculate the destination of a branch/jump. Return -1 if not a branch. */
214 branch_dest (int opcode
, int instr
, CORE_ADDR pc
, CORE_ADDR safety
)
221 absolute
= (int) ((instr
>> 1) & 1);
226 immediate
= ((instr
& ~3) << 6) >> 6; /* br unconditional */
230 dest
= pc
+ immediate
;
234 immediate
= ((instr
& ~3) << 16) >> 16; /* br conditional */
238 dest
= pc
+ immediate
;
242 ext_op
= (instr
>> 1) & 0x3ff;
244 if (ext_op
== 16) /* br conditional register */
246 dest
= read_register (PPC_LR_REGNUM
) & ~3;
248 /* If we are about to return from a signal handler, dest is
249 something like 0x3c90. The current frame is a signal handler
250 caller frame, upon completion of the sigreturn system call
251 execution will return to the saved PC in the frame. */
252 if (dest
< TEXT_SEGMENT_BASE
)
254 struct frame_info
*fi
;
256 fi
= get_current_frame ();
258 dest
= read_memory_addr (fi
->frame
+ SIG_FRAME_PC_OFFSET
,
263 else if (ext_op
== 528) /* br cond to count reg */
265 dest
= read_register (PPC_CTR_REGNUM
) & ~3;
267 /* If we are about to execute a system call, dest is something
268 like 0x22fc or 0x3b00. Upon completion the system call
269 will return to the address in the link register. */
270 if (dest
< TEXT_SEGMENT_BASE
)
271 dest
= read_register (PPC_LR_REGNUM
) & ~3;
280 return (dest
< TEXT_SEGMENT_BASE
) ? safety
: dest
;
284 /* Sequence of bytes for breakpoint instruction. */
286 #define BIG_BREAKPOINT { 0x7d, 0x82, 0x10, 0x08 }
287 #define LITTLE_BREAKPOINT { 0x08, 0x10, 0x82, 0x7d }
289 static unsigned char *
290 rs6000_breakpoint_from_pc (CORE_ADDR
*bp_addr
, int *bp_size
)
292 static unsigned char big_breakpoint
[] = BIG_BREAKPOINT
;
293 static unsigned char little_breakpoint
[] = LITTLE_BREAKPOINT
;
295 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
)
296 return big_breakpoint
;
298 return little_breakpoint
;
302 /* AIX does not support PT_STEP. Simulate it. */
305 rs6000_software_single_step (enum target_signal signal
,
306 int insert_breakpoints_p
)
308 #define INSNLEN(OPCODE) 4
310 static char le_breakp
[] = LITTLE_BREAKPOINT
;
311 static char be_breakp
[] = BIG_BREAKPOINT
;
312 char *breakp
= TARGET_BYTE_ORDER
== BIG_ENDIAN
? be_breakp
: le_breakp
;
318 if (insert_breakpoints_p
)
323 insn
= read_memory_integer (loc
, 4);
325 breaks
[0] = loc
+ INSNLEN (insn
);
327 breaks
[1] = branch_dest (opcode
, insn
, loc
, breaks
[0]);
329 /* Don't put two breakpoints on the same address. */
330 if (breaks
[1] == breaks
[0])
333 stepBreaks
[1].address
= 0;
335 for (ii
= 0; ii
< 2; ++ii
)
338 /* ignore invalid breakpoint. */
339 if (breaks
[ii
] == -1)
342 read_memory (breaks
[ii
], stepBreaks
[ii
].data
, 4);
344 write_memory (breaks
[ii
], breakp
, 4);
345 stepBreaks
[ii
].address
= breaks
[ii
];
352 /* remove step breakpoints. */
353 for (ii
= 0; ii
< 2; ++ii
)
354 if (stepBreaks
[ii
].address
!= 0)
356 (stepBreaks
[ii
].address
, stepBreaks
[ii
].data
, 4);
359 errno
= 0; /* FIXME, don't ignore errors! */
360 /* What errors? {read,write}_memory call error(). */
364 /* return pc value after skipping a function prologue and also return
365 information about a function frame.
367 in struct rs6000_framedata fdata:
368 - frameless is TRUE, if function does not have a frame.
369 - nosavedpc is TRUE, if function does not save %pc value in its frame.
370 - offset is the initial size of this stack frame --- the amount by
371 which we decrement the sp to allocate the frame.
372 - saved_gpr is the number of the first saved gpr.
373 - saved_fpr is the number of the first saved fpr.
374 - alloca_reg is the number of the register used for alloca() handling.
376 - gpr_offset is the offset of the first saved gpr from the previous frame.
377 - fpr_offset is the offset of the first saved fpr from the previous frame.
378 - lr_offset is the offset of the saved lr
379 - cr_offset is the offset of the saved cr
382 #define SIGNED_SHORT(x) \
383 ((sizeof (short) == 2) \
384 ? ((int)(short)(x)) \
385 : ((int)((((x) & 0xffff) ^ 0x8000) - 0x8000)))
387 #define GET_SRC_REG(x) (((x) >> 21) & 0x1f)
389 /* Limit the number of skipped non-prologue instructions, as the examining
390 of the prologue is expensive. */
391 static int max_skip_non_prologue_insns
= 10;
393 /* Given PC representing the starting address of a function, and
394 LIM_PC which is the (sloppy) limit to which to scan when looking
395 for a prologue, attempt to further refine this limit by using
396 the line data in the symbol table. If successful, a better guess
397 on where the prologue ends is returned, otherwise the previous
398 value of lim_pc is returned. */
400 refine_prologue_limit (CORE_ADDR pc
, CORE_ADDR lim_pc
)
402 struct symtab_and_line prologue_sal
;
404 prologue_sal
= find_pc_line (pc
, 0);
405 if (prologue_sal
.line
!= 0)
408 CORE_ADDR addr
= prologue_sal
.end
;
410 /* Handle the case in which compiler's optimizer/scheduler
411 has moved instructions into the prologue. We scan ahead
412 in the function looking for address ranges whose corresponding
413 line number is less than or equal to the first one that we
414 found for the function. (It can be less than when the
415 scheduler puts a body instruction before the first prologue
417 for (i
= 2 * max_skip_non_prologue_insns
;
418 i
> 0 && (lim_pc
== 0 || addr
< lim_pc
);
421 struct symtab_and_line sal
;
423 sal
= find_pc_line (addr
, 0);
426 if (sal
.line
<= prologue_sal
.line
427 && sal
.symtab
== prologue_sal
.symtab
)
434 if (lim_pc
== 0 || prologue_sal
.end
< lim_pc
)
435 lim_pc
= prologue_sal
.end
;
442 skip_prologue (CORE_ADDR pc
, CORE_ADDR lim_pc
, struct rs6000_framedata
*fdata
)
444 CORE_ADDR orig_pc
= pc
;
445 CORE_ADDR last_prologue_pc
= pc
;
453 int minimal_toc_loaded
= 0;
454 int prev_insn_was_prologue_insn
= 1;
455 int num_skip_non_prologue_insns
= 0;
457 /* Attempt to find the end of the prologue when no limit is specified.
458 Note that refine_prologue_limit() has been written so that it may
459 be used to "refine" the limits of non-zero PC values too, but this
460 is only safe if we 1) trust the line information provided by the
461 compiler and 2) iterate enough to actually find the end of the
464 It may become a good idea at some point (for both performance and
465 accuracy) to unconditionally call refine_prologue_limit(). But,
466 until we can make a clear determination that this is beneficial,
467 we'll play it safe and only use it to obtain a limit when none
468 has been specified. */
470 lim_pc
= refine_prologue_limit (pc
, lim_pc
);
472 memset (fdata
, 0, sizeof (struct rs6000_framedata
));
473 fdata
->saved_gpr
= -1;
474 fdata
->saved_fpr
= -1;
475 fdata
->alloca_reg
= -1;
476 fdata
->frameless
= 1;
477 fdata
->nosavedpc
= 1;
481 /* Sometimes it isn't clear if an instruction is a prologue
482 instruction or not. When we encounter one of these ambiguous
483 cases, we'll set prev_insn_was_prologue_insn to 0 (false).
484 Otherwise, we'll assume that it really is a prologue instruction. */
485 if (prev_insn_was_prologue_insn
)
486 last_prologue_pc
= pc
;
488 /* Stop scanning if we've hit the limit. */
489 if (lim_pc
!= 0 && pc
>= lim_pc
)
492 prev_insn_was_prologue_insn
= 1;
494 /* Fetch the instruction and convert it to an integer. */
495 if (target_read_memory (pc
, buf
, 4))
497 op
= extract_signed_integer (buf
, 4);
499 if ((op
& 0xfc1fffff) == 0x7c0802a6)
501 lr_reg
= (op
& 0x03e00000) | 0x90010000;
505 else if ((op
& 0xfc1fffff) == 0x7c000026)
507 cr_reg
= (op
& 0x03e00000) | 0x90010000;
511 else if ((op
& 0xfc1f0000) == 0xd8010000)
512 { /* stfd Rx,NUM(r1) */
513 reg
= GET_SRC_REG (op
);
514 if (fdata
->saved_fpr
== -1 || fdata
->saved_fpr
> reg
)
516 fdata
->saved_fpr
= reg
;
517 fdata
->fpr_offset
= SIGNED_SHORT (op
) + offset
;
522 else if (((op
& 0xfc1f0000) == 0xbc010000) || /* stm Rx, NUM(r1) */
523 (((op
& 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
524 (op
& 0xfc1f0003) == 0xf8010000) && /* std rx,NUM(r1) */
525 (op
& 0x03e00000) >= 0x01a00000)) /* rx >= r13 */
528 reg
= GET_SRC_REG (op
);
529 if (fdata
->saved_gpr
== -1 || fdata
->saved_gpr
> reg
)
531 fdata
->saved_gpr
= reg
;
532 if ((op
& 0xfc1f0003) == 0xf8010000)
534 fdata
->gpr_offset
= SIGNED_SHORT (op
) + offset
;
539 else if ((op
& 0xffff0000) == 0x60000000)
542 /* Allow nops in the prologue, but do not consider them to
543 be part of the prologue unless followed by other prologue
545 prev_insn_was_prologue_insn
= 0;
549 else if ((op
& 0xffff0000) == 0x3c000000)
550 { /* addis 0,0,NUM, used
552 fdata
->offset
= (op
& 0x0000ffff) << 16;
553 fdata
->frameless
= 0;
557 else if ((op
& 0xffff0000) == 0x60000000)
558 { /* ori 0,0,NUM, 2nd ha
559 lf of >= 32k frames */
560 fdata
->offset
|= (op
& 0x0000ffff);
561 fdata
->frameless
= 0;
565 else if (lr_reg
!= -1 && (op
& 0xffff0000) == lr_reg
)
568 fdata
->lr_offset
= SIGNED_SHORT (op
) + offset
;
569 fdata
->nosavedpc
= 0;
574 else if (cr_reg
!= -1 && (op
& 0xffff0000) == cr_reg
)
577 fdata
->cr_offset
= SIGNED_SHORT (op
) + offset
;
582 else if (op
== 0x48000005)
588 else if (op
== 0x48000004)
593 else if (((op
& 0xffff0000) == 0x801e0000 || /* lwz 0,NUM(r30), used
594 in V.4 -mrelocatable */
595 op
== 0x7fc0f214) && /* add r30,r0,r30, used
596 in V.4 -mrelocatable */
597 lr_reg
== 0x901e0000)
602 else if ((op
& 0xffff0000) == 0x3fc00000 || /* addis 30,0,foo@ha, used
603 in V.4 -mminimal-toc */
604 (op
& 0xffff0000) == 0x3bde0000)
605 { /* addi 30,30,foo@l */
609 else if ((op
& 0xfc000001) == 0x48000001)
613 fdata
->frameless
= 0;
614 /* Don't skip over the subroutine call if it is not within the first
615 three instructions of the prologue. */
616 if ((pc
- orig_pc
) > 8)
619 op
= read_memory_integer (pc
+ 4, 4);
621 /* At this point, make sure this is not a trampoline function
622 (a function that simply calls another functions, and nothing else).
623 If the next is not a nop, this branch was part of the function
626 if (op
== 0x4def7b82 || op
== 0) /* crorc 15, 15, 15 */
627 break; /* don't skip over
631 /* update stack pointer */
633 else if ((op
& 0xffff0000) == 0x94210000 || /* stu r1,NUM(r1) */
634 (op
& 0xffff0003) == 0xf8210001) /* stdu r1,NUM(r1) */
636 fdata
->frameless
= 0;
637 if ((op
& 0xffff0003) == 0xf8210001)
639 fdata
->offset
= SIGNED_SHORT (op
);
640 offset
= fdata
->offset
;
644 else if (op
== 0x7c21016e)
646 fdata
->frameless
= 0;
647 offset
= fdata
->offset
;
650 /* Load up minimal toc pointer */
652 else if ((op
>> 22) == 0x20f
653 && !minimal_toc_loaded
)
654 { /* l r31,... or l r30,... */
655 minimal_toc_loaded
= 1;
658 /* move parameters from argument registers to local variable
661 else if ((op
& 0xfc0007fe) == 0x7c000378 && /* mr(.) Rx,Ry */
662 (((op
>> 21) & 31) >= 3) && /* R3 >= Ry >= R10 */
663 (((op
>> 21) & 31) <= 10) &&
664 (((op
>> 16) & 31) >= fdata
->saved_gpr
)) /* Rx: local var reg */
668 /* store parameters in stack */
670 else if ((op
& 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
671 (op
& 0xfc1f0003) == 0xf8010000 || /* std rx,NUM(r1) */
672 (op
& 0xfc1f0000) == 0xd8010000 || /* stfd Rx,NUM(r1) */
673 (op
& 0xfc1f0000) == 0xfc010000) /* frsp, fp?,NUM(r1) */
677 /* store parameters in stack via frame pointer */
680 ((op
& 0xfc1f0000) == 0x901f0000 || /* st rx,NUM(r1) */
681 (op
& 0xfc1f0000) == 0xd81f0000 || /* stfd Rx,NUM(r1) */
682 (op
& 0xfc1f0000) == 0xfc1f0000))
683 { /* frsp, fp?,NUM(r1) */
686 /* Set up frame pointer */
688 else if (op
== 0x603f0000 /* oril r31, r1, 0x0 */
691 fdata
->frameless
= 0;
693 fdata
->alloca_reg
= 31;
696 /* Another way to set up the frame pointer. */
698 else if ((op
& 0xfc1fffff) == 0x38010000)
699 { /* addi rX, r1, 0x0 */
700 fdata
->frameless
= 0;
702 fdata
->alloca_reg
= (op
& ~0x38010000) >> 21;
708 /* Not a recognized prologue instruction.
709 Handle optimizer code motions into the prologue by continuing
710 the search if we have no valid frame yet or if the return
711 address is not yet saved in the frame. */
712 if (fdata
->frameless
== 0
713 && (lr_reg
== -1 || fdata
->nosavedpc
== 0))
716 if (op
== 0x4e800020 /* blr */
717 || op
== 0x4e800420) /* bctr */
718 /* Do not scan past epilogue in frameless functions or
721 if ((op
& 0xf4000000) == 0x40000000) /* bxx */
722 /* Never skip branches. */
725 if (num_skip_non_prologue_insns
++ > max_skip_non_prologue_insns
)
726 /* Do not scan too many insns, scanning insns is expensive with
730 /* Continue scanning. */
731 prev_insn_was_prologue_insn
= 0;
737 /* I have problems with skipping over __main() that I need to address
738 * sometime. Previously, I used to use misc_function_vector which
739 * didn't work as well as I wanted to be. -MGO */
741 /* If the first thing after skipping a prolog is a branch to a function,
742 this might be a call to an initializer in main(), introduced by gcc2.
743 We'd like to skip over it as well. Fortunately, xlc does some extra
744 work before calling a function right after a prologue, thus we can
745 single out such gcc2 behaviour. */
748 if ((op
& 0xfc000001) == 0x48000001)
749 { /* bl foo, an initializer function? */
750 op
= read_memory_integer (pc
+ 4, 4);
752 if (op
== 0x4def7b82)
753 { /* cror 0xf, 0xf, 0xf (nop) */
755 /* check and see if we are in main. If so, skip over this initializer
758 tmp
= find_pc_misc_function (pc
);
759 if (tmp
>= 0 && STREQ (misc_function_vector
[tmp
].name
, main_name ()))
765 fdata
->offset
= -fdata
->offset
;
766 return last_prologue_pc
;
770 /*************************************************************************
771 Support for creating pushing a dummy frame into the stack, and popping
773 *************************************************************************/
776 /* Pop the innermost frame, go back to the caller. */
779 rs6000_pop_frame (void)
781 CORE_ADDR pc
, lr
, sp
, prev_sp
, addr
; /* %pc, %lr, %sp */
782 struct rs6000_framedata fdata
;
783 struct frame_info
*frame
= get_current_frame ();
787 sp
= FRAME_FP (frame
);
789 if (PC_IN_CALL_DUMMY (frame
->pc
, frame
->frame
, frame
->frame
))
791 generic_pop_dummy_frame ();
792 flush_cached_frames ();
796 /* Make sure that all registers are valid. */
797 read_register_bytes (0, NULL
, REGISTER_BYTES
);
799 /* figure out previous %pc value. If the function is frameless, it is
800 still in the link register, otherwise walk the frames and retrieve the
801 saved %pc value in the previous frame. */
803 addr
= get_pc_function_start (frame
->pc
);
804 (void) skip_prologue (addr
, frame
->pc
, &fdata
);
806 wordsize
= TDEP
->wordsize
;
810 prev_sp
= read_memory_addr (sp
, wordsize
);
811 if (fdata
.lr_offset
== 0)
812 lr
= read_register (PPC_LR_REGNUM
);
814 lr
= read_memory_addr (prev_sp
+ fdata
.lr_offset
, wordsize
);
816 /* reset %pc value. */
817 write_register (PC_REGNUM
, lr
);
819 /* reset register values if any was saved earlier. */
821 if (fdata
.saved_gpr
!= -1)
823 addr
= prev_sp
+ fdata
.gpr_offset
;
824 for (ii
= fdata
.saved_gpr
; ii
<= 31; ++ii
)
826 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
)], wordsize
);
831 if (fdata
.saved_fpr
!= -1)
833 addr
= prev_sp
+ fdata
.fpr_offset
;
834 for (ii
= fdata
.saved_fpr
; ii
<= 31; ++ii
)
836 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
+ FP0_REGNUM
)], 8);
841 write_register (SP_REGNUM
, prev_sp
);
842 target_store_registers (-1);
843 flush_cached_frames ();
846 /* Fixup the call sequence of a dummy function, with the real function
847 address. Its arguments will be passed by gdb. */
850 rs6000_fix_call_dummy (char *dummyname
, CORE_ADDR pc
, CORE_ADDR fun
,
851 int nargs
, struct value
**args
, struct type
*type
,
854 #define TOC_ADDR_OFFSET 20
855 #define TARGET_ADDR_OFFSET 28
858 CORE_ADDR target_addr
;
860 if (rs6000_find_toc_address_hook
!= NULL
)
862 CORE_ADDR tocvalue
= (*rs6000_find_toc_address_hook
) (fun
);
863 write_register (PPC_TOC_REGNUM
, tocvalue
);
867 /* Pass the arguments in either registers, or in the stack. In RS/6000,
868 the first eight words of the argument list (that might be less than
869 eight parameters if some parameters occupy more than one word) are
870 passed in r3..r10 registers. float and double parameters are
871 passed in fpr's, in addition to that. Rest of the parameters if any
872 are passed in user stack. There might be cases in which half of the
873 parameter is copied into registers, the other half is pushed into
876 Stack must be aligned on 64-bit boundaries when synthesizing
879 If the function is returning a structure, then the return address is passed
880 in r3, then the first 7 words of the parameters can be passed in registers,
884 rs6000_push_arguments (int nargs
, struct value
**args
, CORE_ADDR sp
,
885 int struct_return
, CORE_ADDR struct_addr
)
889 int argno
; /* current argument number */
890 int argbytes
; /* current argument byte */
892 int f_argno
= 0; /* current floating point argno */
893 int wordsize
= TDEP
->wordsize
;
895 struct value
*arg
= 0;
900 /* The first eight words of ther arguments are passed in registers. Copy
903 If the function is returning a `struct', then the first word (which
904 will be passed in r3) is used for struct return address. In that
905 case we should advance one word and start from r4 register to copy
908 ii
= struct_return
? 1 : 0;
911 effectively indirect call... gcc does...
913 return_val example( float, int);
916 float in fp0, int in r3
917 offset of stack on overflow 8/16
918 for varargs, must go by type.
920 float in r3&r4, int in r5
921 offset of stack on overflow different
923 return in r3 or f0. If no float, must study how gcc emulates floats;
924 pay attention to arg promotion.
925 User may have to cast\args to handle promotion correctly
926 since gdb won't know if prototype supplied or not.
929 for (argno
= 0, argbytes
= 0; argno
< nargs
&& ii
< 8; ++ii
)
931 int reg_size
= REGISTER_RAW_SIZE (ii
+ 3);
934 type
= check_typedef (VALUE_TYPE (arg
));
935 len
= TYPE_LENGTH (type
);
937 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
940 /* floating point arguments are passed in fpr's, as well as gpr's.
941 There are 13 fpr's reserved for passing parameters. At this point
942 there is no way we would run out of them. */
946 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
948 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
+ 1 + f_argno
)],
949 VALUE_CONTENTS (arg
),
957 /* Argument takes more than one register. */
958 while (argbytes
< len
)
960 memset (®isters
[REGISTER_BYTE (ii
+ 3)], 0, reg_size
);
961 memcpy (®isters
[REGISTER_BYTE (ii
+ 3)],
962 ((char *) VALUE_CONTENTS (arg
)) + argbytes
,
963 (len
- argbytes
) > reg_size
964 ? reg_size
: len
- argbytes
);
965 ++ii
, argbytes
+= reg_size
;
968 goto ran_out_of_registers_for_arguments
;
974 { /* Argument can fit in one register. No problem. */
975 int adj
= TARGET_BYTE_ORDER
== BIG_ENDIAN
? reg_size
- len
: 0;
976 memset (®isters
[REGISTER_BYTE (ii
+ 3)], 0, reg_size
);
977 memcpy ((char *)®isters
[REGISTER_BYTE (ii
+ 3)] + adj
,
978 VALUE_CONTENTS (arg
), len
);
983 ran_out_of_registers_for_arguments
:
985 saved_sp
= read_sp ();
986 #ifndef ELF_OBJECT_FORMAT
987 /* location for 8 parameters are always reserved. */
990 /* another six words for back chain, TOC register, link register, etc. */
993 /* stack pointer must be quadword aligned */
997 /* if there are more arguments, allocate space for them in
998 the stack, then push them starting from the ninth one. */
1000 if ((argno
< nargs
) || argbytes
)
1006 space
+= ((len
- argbytes
+ 3) & -4);
1012 for (; jj
< nargs
; ++jj
)
1014 struct value
*val
= args
[jj
];
1015 space
+= ((TYPE_LENGTH (VALUE_TYPE (val
))) + 3) & -4;
1018 /* add location required for the rest of the parameters */
1019 space
= (space
+ 15) & -16;
1022 /* This is another instance we need to be concerned about securing our
1023 stack space. If we write anything underneath %sp (r1), we might conflict
1024 with the kernel who thinks he is free to use this area. So, update %sp
1025 first before doing anything else. */
1027 write_register (SP_REGNUM
, sp
);
1029 /* if the last argument copied into the registers didn't fit there
1030 completely, push the rest of it into stack. */
1034 write_memory (sp
+ 24 + (ii
* 4),
1035 ((char *) VALUE_CONTENTS (arg
)) + argbytes
,
1038 ii
+= ((len
- argbytes
+ 3) & -4) / 4;
1041 /* push the rest of the arguments into stack. */
1042 for (; argno
< nargs
; ++argno
)
1046 type
= check_typedef (VALUE_TYPE (arg
));
1047 len
= TYPE_LENGTH (type
);
1050 /* float types should be passed in fpr's, as well as in the stack. */
1051 if (TYPE_CODE (type
) == TYPE_CODE_FLT
&& f_argno
< 13)
1056 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
1058 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
+ 1 + f_argno
)],
1059 VALUE_CONTENTS (arg
),
1064 write_memory (sp
+ 24 + (ii
* 4), (char *) VALUE_CONTENTS (arg
), len
);
1065 ii
+= ((len
+ 3) & -4) / 4;
1069 /* Secure stack areas first, before doing anything else. */
1070 write_register (SP_REGNUM
, sp
);
1072 /* set back chain properly */
1073 store_address (tmp_buffer
, 4, saved_sp
);
1074 write_memory (sp
, tmp_buffer
, 4);
1076 target_store_registers (-1);
1080 /* Function: ppc_push_return_address (pc, sp)
1081 Set up the return address for the inferior function call. */
1084 ppc_push_return_address (CORE_ADDR pc
, CORE_ADDR sp
)
1086 write_register (PPC_LR_REGNUM
, CALL_DUMMY_ADDRESS ());
1090 /* Extract a function return value of type TYPE from raw register array
1091 REGBUF, and copy that return value into VALBUF in virtual format. */
1094 rs6000_extract_return_value (struct type
*valtype
, char *regbuf
, char *valbuf
)
1098 if (TYPE_CODE (valtype
) == TYPE_CODE_FLT
)
1103 /* floats and doubles are returned in fpr1. fpr's have a size of 8 bytes.
1104 We need to truncate the return value into float size (4 byte) if
1107 if (TYPE_LENGTH (valtype
) > 4) /* this is a double */
1109 ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)],
1110 TYPE_LENGTH (valtype
));
1113 memcpy (&dd
, ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)], 8);
1115 memcpy (valbuf
, &ff
, sizeof (float));
1120 /* return value is copied starting from r3. */
1121 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
1122 && TYPE_LENGTH (valtype
) < REGISTER_RAW_SIZE (3))
1123 offset
= REGISTER_RAW_SIZE (3) - TYPE_LENGTH (valtype
);
1126 regbuf
+ REGISTER_BYTE (3) + offset
,
1127 TYPE_LENGTH (valtype
));
1131 /* Keep structure return address in this variable.
1132 FIXME: This is a horrid kludge which should not be allowed to continue
1133 living. This only allows a single nested call to a structure-returning
1134 function. Come on, guys! -- gnu@cygnus.com, Aug 92 */
1136 static CORE_ADDR rs6000_struct_return_address
;
1138 /* Return whether handle_inferior_event() should proceed through code
1139 starting at PC in function NAME when stepping.
1141 The AIX -bbigtoc linker option generates functions @FIX0, @FIX1, etc. to
1142 handle memory references that are too distant to fit in instructions
1143 generated by the compiler. For example, if 'foo' in the following
1148 is greater than 32767, the linker might replace the lwz with a branch to
1149 somewhere in @FIX1 that does the load in 2 instructions and then branches
1150 back to where execution should continue.
1152 GDB should silently step over @FIX code, just like AIX dbx does.
1153 Unfortunately, the linker uses the "b" instruction for the branches,
1154 meaning that the link register doesn't get set. Therefore, GDB's usual
1155 step_over_function() mechanism won't work.
1157 Instead, use the IN_SOLIB_RETURN_TRAMPOLINE and SKIP_TRAMPOLINE_CODE hooks
1158 in handle_inferior_event() to skip past @FIX code. */
1161 rs6000_in_solib_return_trampoline (CORE_ADDR pc
, char *name
)
1163 return name
&& !strncmp (name
, "@FIX", 4);
1166 /* Skip code that the user doesn't want to see when stepping:
1168 1. Indirect function calls use a piece of trampoline code to do context
1169 switching, i.e. to set the new TOC table. Skip such code if we are on
1170 its first instruction (as when we have single-stepped to here).
1172 2. Skip shared library trampoline code (which is different from
1173 indirect function call trampolines).
1175 3. Skip bigtoc fixup code.
1177 Result is desired PC to step until, or NULL if we are not in
1178 code that should be skipped. */
1181 rs6000_skip_trampoline_code (CORE_ADDR pc
)
1183 register unsigned int ii
, op
;
1185 CORE_ADDR solib_target_pc
;
1186 struct minimal_symbol
*msymbol
;
1188 static unsigned trampoline_code
[] =
1190 0x800b0000, /* l r0,0x0(r11) */
1191 0x90410014, /* st r2,0x14(r1) */
1192 0x7c0903a6, /* mtctr r0 */
1193 0x804b0004, /* l r2,0x4(r11) */
1194 0x816b0008, /* l r11,0x8(r11) */
1195 0x4e800420, /* bctr */
1196 0x4e800020, /* br */
1200 /* Check for bigtoc fixup code. */
1201 msymbol
= lookup_minimal_symbol_by_pc (pc
);
1202 if (msymbol
&& rs6000_in_solib_return_trampoline (pc
, SYMBOL_NAME (msymbol
)))
1204 /* Double-check that the third instruction from PC is relative "b". */
1205 op
= read_memory_integer (pc
+ 8, 4);
1206 if ((op
& 0xfc000003) == 0x48000000)
1208 /* Extract bits 6-29 as a signed 24-bit relative word address and
1209 add it to the containing PC. */
1210 rel
= ((int)(op
<< 6) >> 6);
1211 return pc
+ 8 + rel
;
1215 /* If pc is in a shared library trampoline, return its target. */
1216 solib_target_pc
= find_solib_trampoline_target (pc
);
1217 if (solib_target_pc
)
1218 return solib_target_pc
;
1220 for (ii
= 0; trampoline_code
[ii
]; ++ii
)
1222 op
= read_memory_integer (pc
+ (ii
* 4), 4);
1223 if (op
!= trampoline_code
[ii
])
1226 ii
= read_register (11); /* r11 holds destination addr */
1227 pc
= read_memory_addr (ii
, TDEP
->wordsize
); /* (r11) value */
1231 /* Determines whether the function FI has a frame on the stack or not. */
1234 rs6000_frameless_function_invocation (struct frame_info
*fi
)
1236 CORE_ADDR func_start
;
1237 struct rs6000_framedata fdata
;
1239 /* Don't even think about framelessness except on the innermost frame
1240 or if the function was interrupted by a signal. */
1241 if (fi
->next
!= NULL
&& !fi
->next
->signal_handler_caller
)
1244 func_start
= get_pc_function_start (fi
->pc
);
1246 /* If we failed to find the start of the function, it is a mistake
1247 to inspect the instructions. */
1251 /* A frame with a zero PC is usually created by dereferencing a NULL
1252 function pointer, normally causing an immediate core dump of the
1253 inferior. Mark function as frameless, as the inferior has no chance
1254 of setting up a stack frame. */
1261 (void) skip_prologue (func_start
, fi
->pc
, &fdata
);
1262 return fdata
.frameless
;
1265 /* Return the PC saved in a frame */
1268 rs6000_frame_saved_pc (struct frame_info
*fi
)
1270 CORE_ADDR func_start
;
1271 struct rs6000_framedata fdata
;
1272 int wordsize
= TDEP
->wordsize
;
1274 if (fi
->signal_handler_caller
)
1275 return read_memory_addr (fi
->frame
+ SIG_FRAME_PC_OFFSET
, wordsize
);
1277 if (PC_IN_CALL_DUMMY (fi
->pc
, fi
->frame
, fi
->frame
))
1278 return generic_read_register_dummy (fi
->pc
, fi
->frame
, PC_REGNUM
);
1280 func_start
= get_pc_function_start (fi
->pc
);
1282 /* If we failed to find the start of the function, it is a mistake
1283 to inspect the instructions. */
1287 (void) skip_prologue (func_start
, fi
->pc
, &fdata
);
1289 if (fdata
.lr_offset
== 0 && fi
->next
!= NULL
)
1291 if (fi
->next
->signal_handler_caller
)
1292 return read_memory_addr (fi
->next
->frame
+ SIG_FRAME_LR_OFFSET
,
1295 return read_memory_addr (FRAME_CHAIN (fi
) + DEFAULT_LR_SAVE
,
1299 if (fdata
.lr_offset
== 0)
1300 return read_register (PPC_LR_REGNUM
);
1302 return read_memory_addr (FRAME_CHAIN (fi
) + fdata
.lr_offset
, wordsize
);
1305 /* If saved registers of frame FI are not known yet, read and cache them.
1306 &FDATAP contains rs6000_framedata; TDATAP can be NULL,
1307 in which case the framedata are read. */
1310 frame_get_saved_regs (struct frame_info
*fi
, struct rs6000_framedata
*fdatap
)
1312 CORE_ADDR frame_addr
;
1313 struct rs6000_framedata work_fdata
;
1314 int wordsize
= TDEP
->wordsize
;
1321 fdatap
= &work_fdata
;
1322 (void) skip_prologue (get_pc_function_start (fi
->pc
), fi
->pc
, fdatap
);
1325 frame_saved_regs_zalloc (fi
);
1327 /* If there were any saved registers, figure out parent's stack
1329 /* The following is true only if the frame doesn't have a call to
1332 if (fdatap
->saved_fpr
== 0 && fdatap
->saved_gpr
== 0
1333 && fdatap
->lr_offset
== 0 && fdatap
->cr_offset
== 0)
1335 else if (fi
->prev
&& fi
->prev
->frame
)
1336 frame_addr
= fi
->prev
->frame
;
1338 frame_addr
= read_memory_addr (fi
->frame
, wordsize
);
1340 /* if != -1, fdatap->saved_fpr is the smallest number of saved_fpr.
1341 All fpr's from saved_fpr to fp31 are saved. */
1343 if (fdatap
->saved_fpr
>= 0)
1346 CORE_ADDR fpr_addr
= frame_addr
+ fdatap
->fpr_offset
;
1347 for (i
= fdatap
->saved_fpr
; i
< 32; i
++)
1349 fi
->saved_regs
[FP0_REGNUM
+ i
] = fpr_addr
;
1354 /* if != -1, fdatap->saved_gpr is the smallest number of saved_gpr.
1355 All gpr's from saved_gpr to gpr31 are saved. */
1357 if (fdatap
->saved_gpr
>= 0)
1360 CORE_ADDR gpr_addr
= frame_addr
+ fdatap
->gpr_offset
;
1361 for (i
= fdatap
->saved_gpr
; i
< 32; i
++)
1363 fi
->saved_regs
[i
] = gpr_addr
;
1364 gpr_addr
+= wordsize
;
1368 /* If != 0, fdatap->cr_offset is the offset from the frame that holds
1370 if (fdatap
->cr_offset
!= 0)
1371 fi
->saved_regs
[PPC_CR_REGNUM
] = frame_addr
+ fdatap
->cr_offset
;
1373 /* If != 0, fdatap->lr_offset is the offset from the frame that holds
1375 if (fdatap
->lr_offset
!= 0)
1376 fi
->saved_regs
[PPC_LR_REGNUM
] = frame_addr
+ fdatap
->lr_offset
;
1379 /* Return the address of a frame. This is the inital %sp value when the frame
1380 was first allocated. For functions calling alloca(), it might be saved in
1381 an alloca register. */
1384 frame_initial_stack_address (struct frame_info
*fi
)
1387 struct rs6000_framedata fdata
;
1388 struct frame_info
*callee_fi
;
1390 /* if the initial stack pointer (frame address) of this frame is known,
1393 if (fi
->extra_info
->initial_sp
)
1394 return fi
->extra_info
->initial_sp
;
1396 /* find out if this function is using an alloca register.. */
1398 (void) skip_prologue (get_pc_function_start (fi
->pc
), fi
->pc
, &fdata
);
1400 /* if saved registers of this frame are not known yet, read and cache them. */
1402 if (!fi
->saved_regs
)
1403 frame_get_saved_regs (fi
, &fdata
);
1405 /* If no alloca register used, then fi->frame is the value of the %sp for
1406 this frame, and it is good enough. */
1408 if (fdata
.alloca_reg
< 0)
1410 fi
->extra_info
->initial_sp
= fi
->frame
;
1411 return fi
->extra_info
->initial_sp
;
1414 /* This function has an alloca register. If this is the top-most frame
1415 (with the lowest address), the value in alloca register is good. */
1418 return fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1420 /* Otherwise, this is a caller frame. Callee has usually already saved
1421 registers, but there are exceptions (such as when the callee
1422 has no parameters). Find the address in which caller's alloca
1423 register is saved. */
1425 for (callee_fi
= fi
->next
; callee_fi
; callee_fi
= callee_fi
->next
)
1428 if (!callee_fi
->saved_regs
)
1429 frame_get_saved_regs (callee_fi
, NULL
);
1431 /* this is the address in which alloca register is saved. */
1433 tmpaddr
= callee_fi
->saved_regs
[fdata
.alloca_reg
];
1436 fi
->extra_info
->initial_sp
=
1437 read_memory_addr (tmpaddr
, TDEP
->wordsize
);
1438 return fi
->extra_info
->initial_sp
;
1441 /* Go look into deeper levels of the frame chain to see if any one of
1442 the callees has saved alloca register. */
1445 /* If alloca register was not saved, by the callee (or any of its callees)
1446 then the value in the register is still good. */
1448 fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1449 return fi
->extra_info
->initial_sp
;
1452 /* Describe the pointer in each stack frame to the previous stack frame
1455 /* FRAME_CHAIN takes a frame's nominal address
1456 and produces the frame's chain-pointer. */
1458 /* In the case of the RS/6000, the frame's nominal address
1459 is the address of a 4-byte word containing the calling frame's address. */
1462 rs6000_frame_chain (struct frame_info
*thisframe
)
1464 CORE_ADDR fp
, fpp
, lr
;
1465 int wordsize
= TDEP
->wordsize
;
1467 if (PC_IN_CALL_DUMMY (thisframe
->pc
, thisframe
->frame
, thisframe
->frame
))
1468 return thisframe
->frame
; /* dummy frame same as caller's frame */
1470 if (inside_entry_file (thisframe
->pc
) ||
1471 thisframe
->pc
== entry_point_address ())
1474 if (thisframe
->signal_handler_caller
)
1475 fp
= read_memory_addr (thisframe
->frame
+ SIG_FRAME_FP_OFFSET
,
1477 else if (thisframe
->next
!= NULL
1478 && thisframe
->next
->signal_handler_caller
1479 && FRAMELESS_FUNCTION_INVOCATION (thisframe
))
1480 /* A frameless function interrupted by a signal did not change the
1482 fp
= FRAME_FP (thisframe
);
1484 fp
= read_memory_addr ((thisframe
)->frame
, wordsize
);
1486 lr
= read_register (PPC_LR_REGNUM
);
1487 if (lr
== entry_point_address ())
1488 if (fp
!= 0 && (fpp
= read_memory_addr (fp
, wordsize
)) != 0)
1489 if (PC_IN_CALL_DUMMY (lr
, fpp
, fpp
))
1495 /* Return the size of register REG when words are WORDSIZE bytes long. If REG
1496 isn't available with that word size, return 0. */
1499 regsize (const struct reg
*reg
, int wordsize
)
1501 return wordsize
== 8 ? reg
->sz64
: reg
->sz32
;
1504 /* Return the name of register number N, or null if no such register exists
1505 in the current architecture. */
1508 rs6000_register_name (int n
)
1510 struct gdbarch_tdep
*tdep
= TDEP
;
1511 const struct reg
*reg
= tdep
->regs
+ n
;
1513 if (!regsize (reg
, tdep
->wordsize
))
1518 /* Index within `registers' of the first byte of the space for
1522 rs6000_register_byte (int n
)
1524 return TDEP
->regoff
[n
];
1527 /* Return the number of bytes of storage in the actual machine representation
1528 for register N if that register is available, else return 0. */
1531 rs6000_register_raw_size (int n
)
1533 struct gdbarch_tdep
*tdep
= TDEP
;
1534 const struct reg
*reg
= tdep
->regs
+ n
;
1535 return regsize (reg
, tdep
->wordsize
);
1538 /* Number of bytes of storage in the program's representation
1542 rs6000_register_virtual_size (int n
)
1544 return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (n
));
1547 /* Return the GDB type object for the "standard" data type
1548 of data in register N. */
1550 static struct type
*
1551 rs6000_register_virtual_type (int n
)
1553 struct gdbarch_tdep
*tdep
= TDEP
;
1554 const struct reg
*reg
= tdep
->regs
+ n
;
1556 return reg
->fpr
? builtin_type_double
:
1557 regsize (reg
, tdep
->wordsize
) == 8 ? builtin_type_int64
:
1561 /* For the PowerPC, it appears that the debug info marks float parameters as
1562 floats regardless of whether the function is prototyped, but the actual
1563 values are always passed in as doubles. Tell gdb to always assume that
1564 floats are passed as doubles and then converted in the callee. */
1567 rs6000_coerce_float_to_double (struct type
*formal
, struct type
*actual
)
1572 /* Return whether register N requires conversion when moving from raw format
1575 The register format for RS/6000 floating point registers is always
1576 double, we need a conversion if the memory format is float. */
1579 rs6000_register_convertible (int n
)
1581 const struct reg
*reg
= TDEP
->regs
+ n
;
1585 /* Convert data from raw format for register N in buffer FROM
1586 to virtual format with type TYPE in buffer TO. */
1589 rs6000_register_convert_to_virtual (int n
, struct type
*type
,
1590 char *from
, char *to
)
1592 if (TYPE_LENGTH (type
) != REGISTER_RAW_SIZE (n
))
1594 double val
= extract_floating (from
, REGISTER_RAW_SIZE (n
));
1595 store_floating (to
, TYPE_LENGTH (type
), val
);
1598 memcpy (to
, from
, REGISTER_RAW_SIZE (n
));
1601 /* Convert data from virtual format with type TYPE in buffer FROM
1602 to raw format for register N in buffer TO. */
1605 rs6000_register_convert_to_raw (struct type
*type
, int n
,
1606 char *from
, char *to
)
1608 if (TYPE_LENGTH (type
) != REGISTER_RAW_SIZE (n
))
1610 double val
= extract_floating (from
, TYPE_LENGTH (type
));
1611 store_floating (to
, REGISTER_RAW_SIZE (n
), val
);
1614 memcpy (to
, from
, REGISTER_RAW_SIZE (n
));
1617 /* Store the address of the place in which to copy the structure the
1618 subroutine will return. This is called from call_function.
1620 In RS/6000, struct return addresses are passed as an extra parameter in r3.
1621 In function return, callee is not responsible of returning this address
1622 back. Since gdb needs to find it, we will store in a designated variable
1623 `rs6000_struct_return_address'. */
1626 rs6000_store_struct_return (CORE_ADDR addr
, CORE_ADDR sp
)
1628 write_register (3, addr
);
1629 rs6000_struct_return_address
= addr
;
1632 /* Write into appropriate registers a function return value
1633 of type TYPE, given in virtual format. */
1636 rs6000_store_return_value (struct type
*type
, char *valbuf
)
1638 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
1640 /* Floating point values are returned starting from FPR1 and up.
1641 Say a double_double_double type could be returned in
1642 FPR1/FPR2/FPR3 triple. */
1644 write_register_bytes (REGISTER_BYTE (FP0_REGNUM
+ 1), valbuf
,
1645 TYPE_LENGTH (type
));
1647 /* Everything else is returned in GPR3 and up. */
1648 write_register_bytes (REGISTER_BYTE (PPC_GP0_REGNUM
+ 3), valbuf
,
1649 TYPE_LENGTH (type
));
1652 /* Extract from an array REGBUF containing the (raw) register state
1653 the address in which a function should return its structure value,
1654 as a CORE_ADDR (or an expression that can be used as one). */
1657 rs6000_extract_struct_value_address (char *regbuf
)
1659 return rs6000_struct_return_address
;
1662 /* Return whether PC is in a dummy function call.
1664 FIXME: This just checks for the end of the stack, which is broken
1665 for things like stepping through gcc nested function stubs. */
1668 rs6000_pc_in_call_dummy (CORE_ADDR pc
, CORE_ADDR sp
, CORE_ADDR fp
)
1670 return sp
< pc
&& pc
< fp
;
1673 /* Hook called when a new child process is started. */
1676 rs6000_create_inferior (int pid
)
1678 if (rs6000_set_host_arch_hook
)
1679 rs6000_set_host_arch_hook (pid
);
1682 /* Support for CONVERT_FROM_FUNC_PTR_ADDR(ADDR).
1684 Usually a function pointer's representation is simply the address
1685 of the function. On the RS/6000 however, a function pointer is
1686 represented by a pointer to a TOC entry. This TOC entry contains
1687 three words, the first word is the address of the function, the
1688 second word is the TOC pointer (r2), and the third word is the
1689 static chain value. Throughout GDB it is currently assumed that a
1690 function pointer contains the address of the function, which is not
1691 easy to fix. In addition, the conversion of a function address to
1692 a function pointer would require allocation of a TOC entry in the
1693 inferior's memory space, with all its drawbacks. To be able to
1694 call C++ virtual methods in the inferior (which are called via
1695 function pointers), find_function_addr uses this function to get the
1696 function address from a function pointer. */
1698 /* Return real function address if ADDR (a function pointer) is in the data
1699 space and is therefore a special function pointer. */
1702 rs6000_convert_from_func_ptr_addr (CORE_ADDR addr
)
1704 struct obj_section
*s
;
1706 s
= find_pc_section (addr
);
1707 if (s
&& s
->the_bfd_section
->flags
& SEC_CODE
)
1710 /* ADDR is in the data space, so it's a special function pointer. */
1711 return read_memory_addr (addr
, TDEP
->wordsize
);
1715 /* Handling the various POWER/PowerPC variants. */
1718 /* The arrays here called registers_MUMBLE hold information about available
1721 For each family of PPC variants, I've tried to isolate out the
1722 common registers and put them up front, so that as long as you get
1723 the general family right, GDB will correctly identify the registers
1724 common to that family. The common register sets are:
1726 For the 60x family: hid0 hid1 iabr dabr pir
1728 For the 505 and 860 family: eie eid nri
1730 For the 403 and 403GC: icdbdr esr dear evpr cdbcr tsr tcr pit tbhi
1731 tblo srr2 srr3 dbsr dbcr iac1 iac2 dac1 dac2 dccr iccr pbl1
1734 Most of these register groups aren't anything formal. I arrived at
1735 them by looking at the registers that occurred in more than one
1738 /* Convenience macros for populating register arrays. */
1740 /* Within another macro, convert S to a string. */
1744 /* Return a struct reg defining register NAME that's 32 bits on 32-bit systems
1745 and 64 bits on 64-bit systems. */
1746 #define R(name) { STR(name), 4, 8, 0 }
1748 /* Return a struct reg defining register NAME that's 32 bits on all
1750 #define R4(name) { STR(name), 4, 4, 0 }
1752 /* Return a struct reg defining register NAME that's 64 bits on all
1754 #define R8(name) { STR(name), 8, 8, 0 }
1756 /* Return a struct reg defining floating-point register NAME. */
1757 #define F(name) { STR(name), 8, 8, 1 }
1759 /* Return a struct reg defining register NAME that's 32 bits on 32-bit
1760 systems and that doesn't exist on 64-bit systems. */
1761 #define R32(name) { STR(name), 4, 0, 0 }
1763 /* Return a struct reg defining register NAME that's 64 bits on 64-bit
1764 systems and that doesn't exist on 32-bit systems. */
1765 #define R64(name) { STR(name), 0, 8, 0 }
1767 /* Return a struct reg placeholder for a register that doesn't exist. */
1768 #define R0 { 0, 0, 0, 0 }
1770 /* UISA registers common across all architectures, including POWER. */
1772 #define COMMON_UISA_REGS \
1773 /* 0 */ R(r0), R(r1), R(r2), R(r3), R(r4), R(r5), R(r6), R(r7), \
1774 /* 8 */ R(r8), R(r9), R(r10),R(r11),R(r12),R(r13),R(r14),R(r15), \
1775 /* 16 */ R(r16),R(r17),R(r18),R(r19),R(r20),R(r21),R(r22),R(r23), \
1776 /* 24 */ R(r24),R(r25),R(r26),R(r27),R(r28),R(r29),R(r30),R(r31), \
1777 /* 32 */ F(f0), F(f1), F(f2), F(f3), F(f4), F(f5), F(f6), F(f7), \
1778 /* 40 */ F(f8), F(f9), F(f10),F(f11),F(f12),F(f13),F(f14),F(f15), \
1779 /* 48 */ F(f16),F(f17),F(f18),F(f19),F(f20),F(f21),F(f22),F(f23), \
1780 /* 56 */ F(f24),F(f25),F(f26),F(f27),F(f28),F(f29),F(f30),F(f31), \
1781 /* 64 */ R(pc), R(ps)
1783 /* UISA-level SPRs for PowerPC. */
1784 #define PPC_UISA_SPRS \
1785 /* 66 */ R4(cr), R(lr), R(ctr), R4(xer), R0
1787 /* Segment registers, for PowerPC. */
1788 #define PPC_SEGMENT_REGS \
1789 /* 71 */ R32(sr0), R32(sr1), R32(sr2), R32(sr3), \
1790 /* 75 */ R32(sr4), R32(sr5), R32(sr6), R32(sr7), \
1791 /* 79 */ R32(sr8), R32(sr9), R32(sr10), R32(sr11), \
1792 /* 83 */ R32(sr12), R32(sr13), R32(sr14), R32(sr15)
1794 /* OEA SPRs for PowerPC. */
1795 #define PPC_OEA_SPRS \
1797 /* 88 */ R(ibat0u), R(ibat0l), R(ibat1u), R(ibat1l), \
1798 /* 92 */ R(ibat2u), R(ibat2l), R(ibat3u), R(ibat3l), \
1799 /* 96 */ R(dbat0u), R(dbat0l), R(dbat1u), R(dbat1l), \
1800 /* 100 */ R(dbat2u), R(dbat2l), R(dbat3u), R(dbat3l), \
1801 /* 104 */ R(sdr1), R64(asr), R(dar), R4(dsisr), \
1802 /* 108 */ R(sprg0), R(sprg1), R(sprg2), R(sprg3), \
1803 /* 112 */ R(srr0), R(srr1), R(tbl), R(tbu), \
1804 /* 116 */ R4(dec), R(dabr), R4(ear)
1806 /* IBM POWER (pre-PowerPC) architecture, user-level view. We only cover
1807 user-level SPR's. */
1808 static const struct reg registers_power
[] =
1811 /* 66 */ R4(cnd
), R(lr
), R(cnt
), R4(xer
), R4(mq
)
1814 /* PowerPC UISA - a PPC processor as viewed by user-level code. A UISA-only
1815 view of the PowerPC. */
1816 static const struct reg registers_powerpc
[] =
1822 /* IBM PowerPC 403. */
1823 static const struct reg registers_403
[] =
1829 /* 119 */ R(icdbdr
), R(esr
), R(dear
), R(evpr
),
1830 /* 123 */ R(cdbcr
), R(tsr
), R(tcr
), R(pit
),
1831 /* 127 */ R(tbhi
), R(tblo
), R(srr2
), R(srr3
),
1832 /* 131 */ R(dbsr
), R(dbcr
), R(iac1
), R(iac2
),
1833 /* 135 */ R(dac1
), R(dac2
), R(dccr
), R(iccr
),
1834 /* 139 */ R(pbl1
), R(pbu1
), R(pbl2
), R(pbu2
)
1837 /* IBM PowerPC 403GC. */
1838 static const struct reg registers_403GC
[] =
1844 /* 119 */ R(icdbdr
), R(esr
), R(dear
), R(evpr
),
1845 /* 123 */ R(cdbcr
), R(tsr
), R(tcr
), R(pit
),
1846 /* 127 */ R(tbhi
), R(tblo
), R(srr2
), R(srr3
),
1847 /* 131 */ R(dbsr
), R(dbcr
), R(iac1
), R(iac2
),
1848 /* 135 */ R(dac1
), R(dac2
), R(dccr
), R(iccr
),
1849 /* 139 */ R(pbl1
), R(pbu1
), R(pbl2
), R(pbu2
),
1850 /* 143 */ R(zpr
), R(pid
), R(sgr
), R(dcwr
),
1851 /* 147 */ R(tbhu
), R(tblu
)
1854 /* Motorola PowerPC 505. */
1855 static const struct reg registers_505
[] =
1861 /* 119 */ R(eie
), R(eid
), R(nri
)
1864 /* Motorola PowerPC 860 or 850. */
1865 static const struct reg registers_860
[] =
1871 /* 119 */ R(eie
), R(eid
), R(nri
), R(cmpa
),
1872 /* 123 */ R(cmpb
), R(cmpc
), R(cmpd
), R(icr
),
1873 /* 127 */ R(der
), R(counta
), R(countb
), R(cmpe
),
1874 /* 131 */ R(cmpf
), R(cmpg
), R(cmph
), R(lctrl1
),
1875 /* 135 */ R(lctrl2
), R(ictrl
), R(bar
), R(ic_cst
),
1876 /* 139 */ R(ic_adr
), R(ic_dat
), R(dc_cst
), R(dc_adr
),
1877 /* 143 */ R(dc_dat
), R(dpdr
), R(dpir
), R(immr
),
1878 /* 147 */ R(mi_ctr
), R(mi_ap
), R(mi_epn
), R(mi_twc
),
1879 /* 151 */ R(mi_rpn
), R(md_ctr
), R(m_casid
), R(md_ap
),
1880 /* 155 */ R(md_epn
), R(md_twb
), R(md_twc
), R(md_rpn
),
1881 /* 159 */ R(m_tw
), R(mi_dbcam
), R(mi_dbram0
), R(mi_dbram1
),
1882 /* 163 */ R(md_dbcam
), R(md_dbram0
), R(md_dbram1
)
1885 /* Motorola PowerPC 601. Note that the 601 has different register numbers
1886 for reading and writing RTCU and RTCL. However, how one reads and writes a
1887 register is the stub's problem. */
1888 static const struct reg registers_601
[] =
1894 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1895 /* 123 */ R(pir
), R(mq
), R(rtcu
), R(rtcl
)
1898 /* Motorola PowerPC 602. */
1899 static const struct reg registers_602
[] =
1905 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R0
,
1906 /* 123 */ R0
, R(tcr
), R(ibr
), R(esassr
),
1907 /* 127 */ R(sebr
), R(ser
), R(sp
), R(lt
)
1910 /* Motorola/IBM PowerPC 603 or 603e. */
1911 static const struct reg registers_603
[] =
1917 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R0
,
1918 /* 123 */ R0
, R(dmiss
), R(dcmp
), R(hash1
),
1919 /* 127 */ R(hash2
), R(imiss
), R(icmp
), R(rpa
)
1922 /* Motorola PowerPC 604 or 604e. */
1923 static const struct reg registers_604
[] =
1929 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1930 /* 123 */ R(pir
), R(mmcr0
), R(pmc1
), R(pmc2
),
1931 /* 127 */ R(sia
), R(sda
)
1934 /* Motorola/IBM PowerPC 750 or 740. */
1935 static const struct reg registers_750
[] =
1941 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1942 /* 123 */ R0
, R(ummcr0
), R(upmc1
), R(upmc2
),
1943 /* 127 */ R(usia
), R(ummcr1
), R(upmc3
), R(upmc4
),
1944 /* 131 */ R(mmcr0
), R(pmc1
), R(pmc2
), R(sia
),
1945 /* 135 */ R(mmcr1
), R(pmc3
), R(pmc4
), R(l2cr
),
1946 /* 139 */ R(ictc
), R(thrm1
), R(thrm2
), R(thrm3
)
1950 /* Information about a particular processor variant. */
1954 /* Name of this variant. */
1957 /* English description of the variant. */
1960 /* bfd_arch_info.arch corresponding to variant. */
1961 enum bfd_architecture arch
;
1963 /* bfd_arch_info.mach corresponding to variant. */
1966 /* Table of register names; registers[R] is the name of the register
1969 const struct reg
*regs
;
1972 #define num_registers(list) (sizeof (list) / sizeof((list)[0]))
1975 /* Information in this table comes from the following web sites:
1976 IBM: http://www.chips.ibm.com:80/products/embedded/
1977 Motorola: http://www.mot.com/SPS/PowerPC/
1979 I'm sure I've got some of the variant descriptions not quite right.
1980 Please report any inaccuracies you find to GDB's maintainer.
1982 If you add entries to this table, please be sure to allow the new
1983 value as an argument to the --with-cpu flag, in configure.in. */
1985 static const struct variant variants
[] =
1987 {"powerpc", "PowerPC user-level", bfd_arch_powerpc
,
1988 bfd_mach_ppc
, num_registers (registers_powerpc
), registers_powerpc
},
1989 {"power", "POWER user-level", bfd_arch_rs6000
,
1990 bfd_mach_rs6k
, num_registers (registers_power
), registers_power
},
1991 {"403", "IBM PowerPC 403", bfd_arch_powerpc
,
1992 bfd_mach_ppc_403
, num_registers (registers_403
), registers_403
},
1993 {"601", "Motorola PowerPC 601", bfd_arch_powerpc
,
1994 bfd_mach_ppc_601
, num_registers (registers_601
), registers_601
},
1995 {"602", "Motorola PowerPC 602", bfd_arch_powerpc
,
1996 bfd_mach_ppc_602
, num_registers (registers_602
), registers_602
},
1997 {"603", "Motorola/IBM PowerPC 603 or 603e", bfd_arch_powerpc
,
1998 bfd_mach_ppc_603
, num_registers (registers_603
), registers_603
},
1999 {"604", "Motorola PowerPC 604 or 604e", bfd_arch_powerpc
,
2000 604, num_registers (registers_604
), registers_604
},
2001 {"403GC", "IBM PowerPC 403GC", bfd_arch_powerpc
,
2002 bfd_mach_ppc_403gc
, num_registers (registers_403GC
), registers_403GC
},
2003 {"505", "Motorola PowerPC 505", bfd_arch_powerpc
,
2004 bfd_mach_ppc_505
, num_registers (registers_505
), registers_505
},
2005 {"860", "Motorola PowerPC 860 or 850", bfd_arch_powerpc
,
2006 bfd_mach_ppc_860
, num_registers (registers_860
), registers_860
},
2007 {"750", "Motorola/IBM PowerPC 750 or 740", bfd_arch_powerpc
,
2008 bfd_mach_ppc_750
, num_registers (registers_750
), registers_750
},
2010 /* FIXME: I haven't checked the register sets of the following. */
2011 {"620", "Motorola PowerPC 620", bfd_arch_powerpc
,
2012 bfd_mach_ppc_620
, num_registers (registers_powerpc
), registers_powerpc
},
2013 {"a35", "PowerPC A35", bfd_arch_powerpc
,
2014 bfd_mach_ppc_a35
, num_registers (registers_powerpc
), registers_powerpc
},
2015 {"rs1", "IBM POWER RS1", bfd_arch_rs6000
,
2016 bfd_mach_rs6k_rs1
, num_registers (registers_power
), registers_power
},
2017 {"rsc", "IBM POWER RSC", bfd_arch_rs6000
,
2018 bfd_mach_rs6k_rsc
, num_registers (registers_power
), registers_power
},
2019 {"rs2", "IBM POWER RS2", bfd_arch_rs6000
,
2020 bfd_mach_rs6k_rs2
, num_registers (registers_power
), registers_power
},
2025 #undef num_registers
2027 /* Look up the variant named NAME in the `variants' table. Return a
2028 pointer to the struct variant, or null if we couldn't find it. */
2030 static const struct variant
*
2031 find_variant_by_name (char *name
)
2033 const struct variant
*v
;
2035 for (v
= variants
; v
->name
; v
++)
2036 if (!strcmp (name
, v
->name
))
2042 /* Return the variant corresponding to architecture ARCH and machine number
2043 MACH. If no such variant exists, return null. */
2045 static const struct variant
*
2046 find_variant_by_arch (enum bfd_architecture arch
, unsigned long mach
)
2048 const struct variant
*v
;
2050 for (v
= variants
; v
->name
; v
++)
2051 if (arch
== v
->arch
&& mach
== v
->mach
)
2061 process_note_abi_tag_sections (bfd
*abfd
, asection
*sect
, void *obj
)
2063 int *os_ident_ptr
= obj
;
2065 unsigned int sectsize
;
2067 name
= bfd_get_section_name (abfd
, sect
);
2068 sectsize
= bfd_section_size (abfd
, sect
);
2069 if (strcmp (name
, ".note.ABI-tag") == 0 && sectsize
> 0)
2071 unsigned int name_length
, data_length
, note_type
;
2072 char *note
= alloca (sectsize
);
2074 bfd_get_section_contents (abfd
, sect
, note
,
2075 (file_ptr
) 0, (bfd_size_type
) sectsize
);
2077 name_length
= bfd_h_get_32 (abfd
, note
);
2078 data_length
= bfd_h_get_32 (abfd
, note
+ 4);
2079 note_type
= bfd_h_get_32 (abfd
, note
+ 8);
2081 if (name_length
== 4 && data_length
== 16 && note_type
== 1
2082 && strcmp (note
+ 12, "GNU") == 0)
2084 int os_number
= bfd_h_get_32 (abfd
, note
+ 16);
2086 /* The case numbers are from abi-tags in glibc */
2090 *os_ident_ptr
= ELFOSABI_LINUX
;
2093 *os_ident_ptr
= ELFOSABI_HURD
;
2096 *os_ident_ptr
= ELFOSABI_SOLARIS
;
2099 internal_error (__FILE__
, __LINE__
,
2100 "process_note_abi_sections: unknown OS number %d",
2108 /* Return one of the ELFOSABI_ constants for BFDs representing ELF
2109 executables. If it's not an ELF executable or if the OS/ABI couldn't
2110 be determined, simply return -1. */
2113 get_elfosabi (bfd
*abfd
)
2117 if (abfd
!= NULL
&& bfd_get_flavour (abfd
) == bfd_target_elf_flavour
)
2119 elfosabi
= elf_elfheader (abfd
)->e_ident
[EI_OSABI
];
2121 /* When elfosabi is 0 (ELFOSABI_NONE), this is supposed to indicate
2122 that we're on a SYSV system. However, GNU/Linux uses a note section
2123 to record OS/ABI info, but leaves e_ident[EI_OSABI] zero. So we
2124 have to check the note sections too. */
2127 bfd_map_over_sections (abfd
,
2128 process_note_abi_tag_sections
,
2138 /* Initialize the current architecture based on INFO. If possible, re-use an
2139 architecture from ARCHES, which is a list of architectures already created
2140 during this debugging session.
2142 Called e.g. at program startup, when reading a core file, and when reading
2145 static struct gdbarch
*
2146 rs6000_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
2148 struct gdbarch
*gdbarch
;
2149 struct gdbarch_tdep
*tdep
;
2150 int wordsize
, from_xcoff_exec
, from_elf_exec
, power
, i
, off
;
2152 const struct variant
*v
;
2153 enum bfd_architecture arch
;
2156 int osabi
, sysv_abi
;
2158 from_xcoff_exec
= info
.abfd
&& info
.abfd
->format
== bfd_object
&&
2159 bfd_get_flavour (info
.abfd
) == bfd_target_xcoff_flavour
;
2161 from_elf_exec
= info
.abfd
&& info
.abfd
->format
== bfd_object
&&
2162 bfd_get_flavour (info
.abfd
) == bfd_target_elf_flavour
;
2164 sysv_abi
= info
.abfd
&& bfd_get_flavour (info
.abfd
) == bfd_target_elf_flavour
;
2166 osabi
= get_elfosabi (info
.abfd
);
2168 /* Check word size. If INFO is from a binary file, infer it from
2169 that, else choose a likely default. */
2170 if (from_xcoff_exec
)
2172 if (xcoff_data (info
.abfd
)->xcoff64
)
2177 else if (from_elf_exec
)
2179 if (elf_elfheader (info
.abfd
)->e_ident
[EI_CLASS
] == ELFCLASS64
)
2189 /* Find a candidate among extant architectures. */
2190 for (arches
= gdbarch_list_lookup_by_info (arches
, &info
);
2192 arches
= gdbarch_list_lookup_by_info (arches
->next
, &info
))
2194 /* Word size in the various PowerPC bfd_arch_info structs isn't
2195 meaningful, because 64-bit CPUs can run in 32-bit mode. So, perform
2196 separate word size check. */
2197 tdep
= gdbarch_tdep (arches
->gdbarch
);
2198 if (tdep
&& tdep
->wordsize
== wordsize
&& tdep
->osabi
== osabi
)
2199 return arches
->gdbarch
;
2202 /* None found, create a new architecture from INFO, whose bfd_arch_info
2203 validity depends on the source:
2204 - executable useless
2205 - rs6000_host_arch() good
2207 - "set arch" trust blindly
2208 - GDB startup useless but harmless */
2210 if (!from_xcoff_exec
)
2212 arch
= info
.bfd_arch_info
->arch
;
2213 mach
= info
.bfd_arch_info
->mach
;
2217 arch
= bfd_arch_powerpc
;
2219 bfd_default_set_arch_mach (&abfd
, arch
, mach
);
2220 info
.bfd_arch_info
= bfd_get_arch_info (&abfd
);
2222 tdep
= xmalloc (sizeof (struct gdbarch_tdep
));
2223 tdep
->wordsize
= wordsize
;
2224 tdep
->osabi
= osabi
;
2225 gdbarch
= gdbarch_alloc (&info
, tdep
);
2226 power
= arch
== bfd_arch_rs6000
;
2228 /* Select instruction printer. */
2229 tm_print_insn
= arch
== power
? print_insn_rs6000
:
2230 info
.byte_order
== BIG_ENDIAN
? print_insn_big_powerpc
:
2231 print_insn_little_powerpc
;
2233 /* Choose variant. */
2234 v
= find_variant_by_arch (arch
, mach
);
2236 v
= find_variant_by_name (power
? "power" : "powerpc");
2237 tdep
->regs
= v
->regs
;
2239 /* Calculate byte offsets in raw register array. */
2240 tdep
->regoff
= xmalloc (v
->nregs
* sizeof (int));
2241 for (i
= off
= 0; i
< v
->nregs
; i
++)
2243 tdep
->regoff
[i
] = off
;
2244 off
+= regsize (v
->regs
+ i
, wordsize
);
2247 set_gdbarch_read_pc (gdbarch
, generic_target_read_pc
);
2248 set_gdbarch_write_pc (gdbarch
, generic_target_write_pc
);
2249 set_gdbarch_read_fp (gdbarch
, generic_target_read_fp
);
2250 set_gdbarch_write_fp (gdbarch
, generic_target_write_fp
);
2251 set_gdbarch_read_sp (gdbarch
, generic_target_read_sp
);
2252 set_gdbarch_write_sp (gdbarch
, generic_target_write_sp
);
2254 set_gdbarch_num_regs (gdbarch
, v
->nregs
);
2255 set_gdbarch_sp_regnum (gdbarch
, 1);
2256 set_gdbarch_fp_regnum (gdbarch
, 1);
2257 set_gdbarch_pc_regnum (gdbarch
, 64);
2258 set_gdbarch_register_name (gdbarch
, rs6000_register_name
);
2259 set_gdbarch_register_size (gdbarch
, wordsize
);
2260 set_gdbarch_register_bytes (gdbarch
, off
);
2261 set_gdbarch_register_byte (gdbarch
, rs6000_register_byte
);
2262 set_gdbarch_register_raw_size (gdbarch
, rs6000_register_raw_size
);
2263 set_gdbarch_max_register_raw_size (gdbarch
, 8);
2264 set_gdbarch_register_virtual_size (gdbarch
, rs6000_register_virtual_size
);
2265 set_gdbarch_max_register_virtual_size (gdbarch
, 8);
2266 set_gdbarch_register_virtual_type (gdbarch
, rs6000_register_virtual_type
);
2268 set_gdbarch_ptr_bit (gdbarch
, wordsize
* TARGET_CHAR_BIT
);
2269 set_gdbarch_short_bit (gdbarch
, 2 * TARGET_CHAR_BIT
);
2270 set_gdbarch_int_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
2271 set_gdbarch_long_bit (gdbarch
, wordsize
* TARGET_CHAR_BIT
);
2272 set_gdbarch_long_long_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2273 set_gdbarch_float_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
2274 set_gdbarch_double_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2275 set_gdbarch_long_double_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2277 set_gdbarch_use_generic_dummy_frames (gdbarch
, 1);
2278 set_gdbarch_call_dummy_length (gdbarch
, 0);
2279 set_gdbarch_call_dummy_location (gdbarch
, AT_ENTRY_POINT
);
2280 set_gdbarch_call_dummy_address (gdbarch
, entry_point_address
);
2281 set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch
, 1);
2282 set_gdbarch_call_dummy_breakpoint_offset (gdbarch
, 0);
2283 set_gdbarch_call_dummy_start_offset (gdbarch
, 0);
2284 set_gdbarch_pc_in_call_dummy (gdbarch
, generic_pc_in_call_dummy
);
2285 set_gdbarch_call_dummy_p (gdbarch
, 1);
2286 set_gdbarch_call_dummy_stack_adjust_p (gdbarch
, 0);
2287 set_gdbarch_get_saved_register (gdbarch
, generic_get_saved_register
);
2288 set_gdbarch_fix_call_dummy (gdbarch
, rs6000_fix_call_dummy
);
2289 set_gdbarch_push_dummy_frame (gdbarch
, generic_push_dummy_frame
);
2290 set_gdbarch_save_dummy_frame_tos (gdbarch
, generic_save_dummy_frame_tos
);
2291 set_gdbarch_push_return_address (gdbarch
, ppc_push_return_address
);
2292 set_gdbarch_believe_pcc_promotion (gdbarch
, 1);
2293 set_gdbarch_coerce_float_to_double (gdbarch
, rs6000_coerce_float_to_double
);
2295 set_gdbarch_register_convertible (gdbarch
, rs6000_register_convertible
);
2296 set_gdbarch_register_convert_to_virtual (gdbarch
, rs6000_register_convert_to_virtual
);
2297 set_gdbarch_register_convert_to_raw (gdbarch
, rs6000_register_convert_to_raw
);
2299 set_gdbarch_extract_return_value (gdbarch
, rs6000_extract_return_value
);
2302 set_gdbarch_push_arguments (gdbarch
, ppc_sysv_abi_push_arguments
);
2304 set_gdbarch_push_arguments (gdbarch
, rs6000_push_arguments
);
2306 set_gdbarch_store_struct_return (gdbarch
, rs6000_store_struct_return
);
2307 set_gdbarch_store_return_value (gdbarch
, rs6000_store_return_value
);
2308 set_gdbarch_extract_struct_value_address (gdbarch
, rs6000_extract_struct_value_address
);
2309 set_gdbarch_use_struct_convention (gdbarch
, generic_use_struct_convention
);
2311 set_gdbarch_pop_frame (gdbarch
, rs6000_pop_frame
);
2313 set_gdbarch_skip_prologue (gdbarch
, rs6000_skip_prologue
);
2314 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
2315 set_gdbarch_decr_pc_after_break (gdbarch
, 0);
2316 set_gdbarch_function_start_offset (gdbarch
, 0);
2317 set_gdbarch_breakpoint_from_pc (gdbarch
, rs6000_breakpoint_from_pc
);
2319 /* Not sure on this. FIXMEmgo */
2320 set_gdbarch_frame_args_skip (gdbarch
, 8);
2322 set_gdbarch_frame_chain_valid (gdbarch
, file_frame_chain_valid
);
2323 if (osabi
== ELFOSABI_LINUX
)
2325 set_gdbarch_frameless_function_invocation (gdbarch
,
2326 ppc_linux_frameless_function_invocation
);
2327 set_gdbarch_frame_chain (gdbarch
, ppc_linux_frame_chain
);
2328 set_gdbarch_frame_saved_pc (gdbarch
, ppc_linux_frame_saved_pc
);
2330 set_gdbarch_frame_init_saved_regs (gdbarch
,
2331 ppc_linux_frame_init_saved_regs
);
2332 set_gdbarch_init_extra_frame_info (gdbarch
,
2333 ppc_linux_init_extra_frame_info
);
2335 set_gdbarch_memory_remove_breakpoint (gdbarch
,
2336 ppc_linux_memory_remove_breakpoint
);
2337 set_solib_svr4_fetch_link_map_offsets
2338 (gdbarch
, ppc_linux_svr4_fetch_link_map_offsets
);
2342 set_gdbarch_frameless_function_invocation (gdbarch
,
2343 rs6000_frameless_function_invocation
);
2344 set_gdbarch_frame_chain (gdbarch
, rs6000_frame_chain
);
2345 set_gdbarch_frame_saved_pc (gdbarch
, rs6000_frame_saved_pc
);
2347 set_gdbarch_frame_init_saved_regs (gdbarch
, rs6000_frame_init_saved_regs
);
2348 set_gdbarch_init_extra_frame_info (gdbarch
, rs6000_init_extra_frame_info
);
2350 /* Handle RS/6000 function pointers. */
2351 set_gdbarch_convert_from_func_ptr_addr (gdbarch
,
2352 rs6000_convert_from_func_ptr_addr
);
2354 set_gdbarch_frame_args_address (gdbarch
, rs6000_frame_args_address
);
2355 set_gdbarch_frame_locals_address (gdbarch
, rs6000_frame_args_address
);
2356 set_gdbarch_saved_pc_after_call (gdbarch
, rs6000_saved_pc_after_call
);
2358 /* We can't tell how many args there are
2359 now that the C compiler delays popping them. */
2360 set_gdbarch_frame_num_args (gdbarch
, frame_num_args_unknown
);
2365 /* Initialization code. */
2368 _initialize_rs6000_tdep (void)
2370 register_gdbarch_init (bfd_arch_rs6000
, rs6000_gdbarch_init
);
2371 register_gdbarch_init (bfd_arch_powerpc
, rs6000_gdbarch_init
);