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"
35 #include "bfd/libbfd.h" /* for bfd_default_set_arch_mach */
36 #include "coff/internal.h" /* for libcoff.h */
37 #include "bfd/libcoff.h" /* for xcoff_data */
43 /* If the kernel has to deliver a signal, it pushes a sigcontext
44 structure on the stack and then calls the signal handler, passing
45 the address of the sigcontext in an argument register. Usually
46 the signal handler doesn't save this register, so we have to
47 access the sigcontext structure via an offset from the signal handler
49 The following constants were determined by experimentation on AIX 3.2. */
50 #define SIG_FRAME_PC_OFFSET 96
51 #define SIG_FRAME_LR_OFFSET 108
52 #define SIG_FRAME_FP_OFFSET 284
54 /* To be used by skip_prologue. */
56 struct rs6000_framedata
58 int offset
; /* total size of frame --- the distance
59 by which we decrement sp to allocate
61 int saved_gpr
; /* smallest # of saved gpr */
62 int saved_fpr
; /* smallest # of saved fpr */
63 int alloca_reg
; /* alloca register number (frame ptr) */
64 char frameless
; /* true if frameless functions. */
65 char nosavedpc
; /* true if pc not saved. */
66 int gpr_offset
; /* offset of saved gprs from prev sp */
67 int fpr_offset
; /* offset of saved fprs from prev sp */
68 int lr_offset
; /* offset of saved lr */
69 int cr_offset
; /* offset of saved cr */
72 /* Description of a single register. */
76 char *name
; /* name of register */
77 unsigned char sz32
; /* size on 32-bit arch, 0 if nonextant */
78 unsigned char sz64
; /* size on 64-bit arch, 0 if nonextant */
79 unsigned char fpr
; /* whether register is floating-point */
82 /* Private data that this module attaches to struct gdbarch. */
86 int wordsize
; /* size in bytes of fixed-point word */
87 int osabi
; /* OS / ABI from ELF header */
88 int *regoff
; /* byte offsets in register arrays */
89 const struct reg
*regs
; /* from current variant */
92 /* Return the current architecture's gdbarch_tdep structure. */
94 #define TDEP gdbarch_tdep (current_gdbarch)
96 /* Breakpoint shadows for the single step instructions will be kept here. */
98 static struct sstep_breaks
100 /* Address, or 0 if this is not in use. */
102 /* Shadow contents. */
107 /* Hook for determining the TOC address when calling functions in the
108 inferior under AIX. The initialization code in rs6000-nat.c sets
109 this hook to point to find_toc_address. */
111 CORE_ADDR (*rs6000_find_toc_address_hook
) (CORE_ADDR
) = NULL
;
113 /* Hook to set the current architecture when starting a child process.
114 rs6000-nat.c sets this. */
116 void (*rs6000_set_host_arch_hook
) (int) = NULL
;
118 /* Static function prototypes */
120 static CORE_ADDR
branch_dest (int opcode
, int instr
, CORE_ADDR pc
,
122 static CORE_ADDR
skip_prologue (CORE_ADDR
, CORE_ADDR
,
123 struct rs6000_framedata
*);
124 static void frame_get_saved_regs (struct frame_info
* fi
,
125 struct rs6000_framedata
* fdatap
);
126 static CORE_ADDR
frame_initial_stack_address (struct frame_info
*);
128 /* Read a LEN-byte address from debugged memory address MEMADDR. */
131 read_memory_addr (CORE_ADDR memaddr
, int len
)
133 return read_memory_unsigned_integer (memaddr
, len
);
137 rs6000_skip_prologue (CORE_ADDR pc
)
139 struct rs6000_framedata frame
;
140 pc
= skip_prologue (pc
, 0, &frame
);
145 /* Fill in fi->saved_regs */
147 struct frame_extra_info
149 /* Functions calling alloca() change the value of the stack
150 pointer. We need to use initial stack pointer (which is saved in
151 r31 by gcc) in such cases. If a compiler emits traceback table,
152 then we should use the alloca register specified in traceback
154 CORE_ADDR initial_sp
; /* initial stack pointer. */
158 rs6000_init_extra_frame_info (int fromleaf
, struct frame_info
*fi
)
160 fi
->extra_info
= (struct frame_extra_info
*)
161 frame_obstack_alloc (sizeof (struct frame_extra_info
));
162 fi
->extra_info
->initial_sp
= 0;
163 if (fi
->next
!= (CORE_ADDR
) 0
164 && fi
->pc
< TEXT_SEGMENT_BASE
)
165 /* We're in get_prev_frame */
166 /* and this is a special signal frame. */
167 /* (fi->pc will be some low address in the kernel, */
168 /* to which the signal handler returns). */
169 fi
->signal_handler_caller
= 1;
172 /* Put here the code to store, into a struct frame_saved_regs,
173 the addresses of the saved registers of frame described by FRAME_INFO.
174 This includes special registers such as pc and fp saved in special
175 ways in the stack frame. sp is even more special:
176 the address we return for it IS the sp for the next frame. */
178 /* In this implementation for RS/6000, we do *not* save sp. I am
179 not sure if it will be needed. The following function takes care of gpr's
183 rs6000_frame_init_saved_regs (struct frame_info
*fi
)
185 frame_get_saved_regs (fi
, NULL
);
189 rs6000_frame_args_address (struct frame_info
*fi
)
191 if (fi
->extra_info
->initial_sp
!= 0)
192 return fi
->extra_info
->initial_sp
;
194 return frame_initial_stack_address (fi
);
197 /* Immediately after a function call, return the saved pc.
198 Can't go through the frames for this because on some machines
199 the new frame is not set up until the new function executes
200 some instructions. */
203 rs6000_saved_pc_after_call (struct frame_info
*fi
)
205 return read_register (PPC_LR_REGNUM
);
208 /* Calculate the destination of a branch/jump. Return -1 if not a branch. */
211 branch_dest (int opcode
, int instr
, CORE_ADDR pc
, CORE_ADDR safety
)
218 absolute
= (int) ((instr
>> 1) & 1);
223 immediate
= ((instr
& ~3) << 6) >> 6; /* br unconditional */
227 dest
= pc
+ immediate
;
231 immediate
= ((instr
& ~3) << 16) >> 16; /* br conditional */
235 dest
= pc
+ immediate
;
239 ext_op
= (instr
>> 1) & 0x3ff;
241 if (ext_op
== 16) /* br conditional register */
243 dest
= read_register (PPC_LR_REGNUM
) & ~3;
245 /* If we are about to return from a signal handler, dest is
246 something like 0x3c90. The current frame is a signal handler
247 caller frame, upon completion of the sigreturn system call
248 execution will return to the saved PC in the frame. */
249 if (dest
< TEXT_SEGMENT_BASE
)
251 struct frame_info
*fi
;
253 fi
= get_current_frame ();
255 dest
= read_memory_addr (fi
->frame
+ SIG_FRAME_PC_OFFSET
,
260 else if (ext_op
== 528) /* br cond to count reg */
262 dest
= read_register (PPC_CTR_REGNUM
) & ~3;
264 /* If we are about to execute a system call, dest is something
265 like 0x22fc or 0x3b00. Upon completion the system call
266 will return to the address in the link register. */
267 if (dest
< TEXT_SEGMENT_BASE
)
268 dest
= read_register (PPC_LR_REGNUM
) & ~3;
277 return (dest
< TEXT_SEGMENT_BASE
) ? safety
: dest
;
281 /* Sequence of bytes for breakpoint instruction. */
283 #define BIG_BREAKPOINT { 0x7d, 0x82, 0x10, 0x08 }
284 #define LITTLE_BREAKPOINT { 0x08, 0x10, 0x82, 0x7d }
286 static unsigned char *
287 rs6000_breakpoint_from_pc (CORE_ADDR
*bp_addr
, int *bp_size
)
289 static unsigned char big_breakpoint
[] = BIG_BREAKPOINT
;
290 static unsigned char little_breakpoint
[] = LITTLE_BREAKPOINT
;
292 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
)
293 return big_breakpoint
;
295 return little_breakpoint
;
299 /* AIX does not support PT_STEP. Simulate it. */
302 rs6000_software_single_step (enum target_signal signal
,
303 int insert_breakpoints_p
)
305 #define INSNLEN(OPCODE) 4
307 static char le_breakp
[] = LITTLE_BREAKPOINT
;
308 static char be_breakp
[] = BIG_BREAKPOINT
;
309 char *breakp
= TARGET_BYTE_ORDER
== BIG_ENDIAN
? be_breakp
: le_breakp
;
315 if (insert_breakpoints_p
)
320 insn
= read_memory_integer (loc
, 4);
322 breaks
[0] = loc
+ INSNLEN (insn
);
324 breaks
[1] = branch_dest (opcode
, insn
, loc
, breaks
[0]);
326 /* Don't put two breakpoints on the same address. */
327 if (breaks
[1] == breaks
[0])
330 stepBreaks
[1].address
= 0;
332 for (ii
= 0; ii
< 2; ++ii
)
335 /* ignore invalid breakpoint. */
336 if (breaks
[ii
] == -1)
339 read_memory (breaks
[ii
], stepBreaks
[ii
].data
, 4);
341 write_memory (breaks
[ii
], breakp
, 4);
342 stepBreaks
[ii
].address
= breaks
[ii
];
349 /* remove step breakpoints. */
350 for (ii
= 0; ii
< 2; ++ii
)
351 if (stepBreaks
[ii
].address
!= 0)
353 (stepBreaks
[ii
].address
, stepBreaks
[ii
].data
, 4);
356 errno
= 0; /* FIXME, don't ignore errors! */
357 /* What errors? {read,write}_memory call error(). */
361 /* return pc value after skipping a function prologue and also return
362 information about a function frame.
364 in struct rs6000_framedata fdata:
365 - frameless is TRUE, if function does not have a frame.
366 - nosavedpc is TRUE, if function does not save %pc value in its frame.
367 - offset is the initial size of this stack frame --- the amount by
368 which we decrement the sp to allocate the frame.
369 - saved_gpr is the number of the first saved gpr.
370 - saved_fpr is the number of the first saved fpr.
371 - alloca_reg is the number of the register used for alloca() handling.
373 - gpr_offset is the offset of the first saved gpr from the previous frame.
374 - fpr_offset is the offset of the first saved fpr from the previous frame.
375 - lr_offset is the offset of the saved lr
376 - cr_offset is the offset of the saved cr
379 #define SIGNED_SHORT(x) \
380 ((sizeof (short) == 2) \
381 ? ((int)(short)(x)) \
382 : ((int)((((x) & 0xffff) ^ 0x8000) - 0x8000)))
384 #define GET_SRC_REG(x) (((x) >> 21) & 0x1f)
386 /* Limit the number of skipped non-prologue instructions, as the examining
387 of the prologue is expensive. */
388 static int max_skip_non_prologue_insns
= 10;
390 /* Given PC representing the starting address of a function, and
391 LIM_PC which is the (sloppy) limit to which to scan when looking
392 for a prologue, attempt to further refine this limit by using
393 the line data in the symbol table. If successful, a better guess
394 on where the prologue ends is returned, otherwise the previous
395 value of lim_pc is returned. */
397 refine_prologue_limit (CORE_ADDR pc
, CORE_ADDR lim_pc
)
399 struct symtab_and_line prologue_sal
;
401 prologue_sal
= find_pc_line (pc
, 0);
402 if (prologue_sal
.line
!= 0)
405 CORE_ADDR addr
= prologue_sal
.end
;
407 /* Handle the case in which compiler's optimizer/scheduler
408 has moved instructions into the prologue. We scan ahead
409 in the function looking for address ranges whose corresponding
410 line number is less than or equal to the first one that we
411 found for the function. (It can be less than when the
412 scheduler puts a body instruction before the first prologue
414 for (i
= 2 * max_skip_non_prologue_insns
;
415 i
> 0 && (lim_pc
== 0 || addr
< lim_pc
);
418 struct symtab_and_line sal
;
420 sal
= find_pc_line (addr
, 0);
423 if (sal
.line
<= prologue_sal
.line
424 && sal
.symtab
== prologue_sal
.symtab
)
431 if (lim_pc
== 0 || prologue_sal
.end
< lim_pc
)
432 lim_pc
= prologue_sal
.end
;
439 skip_prologue (CORE_ADDR pc
, CORE_ADDR lim_pc
, struct rs6000_framedata
*fdata
)
441 CORE_ADDR orig_pc
= pc
;
442 CORE_ADDR last_prologue_pc
= pc
;
450 int minimal_toc_loaded
= 0;
451 int prev_insn_was_prologue_insn
= 1;
452 int num_skip_non_prologue_insns
= 0;
454 /* Attempt to find the end of the prologue when no limit is specified.
455 Note that refine_prologue_limit() has been written so that it may
456 be used to "refine" the limits of non-zero PC values too, but this
457 is only safe if we 1) trust the line information provided by the
458 compiler and 2) iterate enough to actually find the end of the
461 It may become a good idea at some point (for both performance and
462 accuracy) to unconditionally call refine_prologue_limit(). But,
463 until we can make a clear determination that this is beneficial,
464 we'll play it safe and only use it to obtain a limit when none
465 has been specified. */
467 lim_pc
= refine_prologue_limit (pc
, lim_pc
);
469 memset (fdata
, 0, sizeof (struct rs6000_framedata
));
470 fdata
->saved_gpr
= -1;
471 fdata
->saved_fpr
= -1;
472 fdata
->alloca_reg
= -1;
473 fdata
->frameless
= 1;
474 fdata
->nosavedpc
= 1;
478 /* Sometimes it isn't clear if an instruction is a prologue
479 instruction or not. When we encounter one of these ambiguous
480 cases, we'll set prev_insn_was_prologue_insn to 0 (false).
481 Otherwise, we'll assume that it really is a prologue instruction. */
482 if (prev_insn_was_prologue_insn
)
483 last_prologue_pc
= pc
;
485 /* Stop scanning if we've hit the limit. */
486 if (lim_pc
!= 0 && pc
>= lim_pc
)
489 prev_insn_was_prologue_insn
= 1;
491 /* Fetch the instruction and convert it to an integer. */
492 if (target_read_memory (pc
, buf
, 4))
494 op
= extract_signed_integer (buf
, 4);
496 if ((op
& 0xfc1fffff) == 0x7c0802a6)
498 lr_reg
= (op
& 0x03e00000) | 0x90010000;
502 else if ((op
& 0xfc1fffff) == 0x7c000026)
504 cr_reg
= (op
& 0x03e00000) | 0x90010000;
508 else if ((op
& 0xfc1f0000) == 0xd8010000)
509 { /* stfd Rx,NUM(r1) */
510 reg
= GET_SRC_REG (op
);
511 if (fdata
->saved_fpr
== -1 || fdata
->saved_fpr
> reg
)
513 fdata
->saved_fpr
= reg
;
514 fdata
->fpr_offset
= SIGNED_SHORT (op
) + offset
;
519 else if (((op
& 0xfc1f0000) == 0xbc010000) || /* stm Rx, NUM(r1) */
520 (((op
& 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
521 (op
& 0xfc1f0003) == 0xf8010000) && /* std rx,NUM(r1) */
522 (op
& 0x03e00000) >= 0x01a00000)) /* rx >= r13 */
525 reg
= GET_SRC_REG (op
);
526 if (fdata
->saved_gpr
== -1 || fdata
->saved_gpr
> reg
)
528 fdata
->saved_gpr
= reg
;
529 if ((op
& 0xfc1f0003) == 0xf8010000)
531 fdata
->gpr_offset
= SIGNED_SHORT (op
) + offset
;
536 else if ((op
& 0xffff0000) == 0x60000000)
539 /* Allow nops in the prologue, but do not consider them to
540 be part of the prologue unless followed by other prologue
542 prev_insn_was_prologue_insn
= 0;
546 else if ((op
& 0xffff0000) == 0x3c000000)
547 { /* addis 0,0,NUM, used
549 fdata
->offset
= (op
& 0x0000ffff) << 16;
550 fdata
->frameless
= 0;
554 else if ((op
& 0xffff0000) == 0x60000000)
555 { /* ori 0,0,NUM, 2nd ha
556 lf of >= 32k frames */
557 fdata
->offset
|= (op
& 0x0000ffff);
558 fdata
->frameless
= 0;
562 else if (lr_reg
!= -1 && (op
& 0xffff0000) == lr_reg
)
565 fdata
->lr_offset
= SIGNED_SHORT (op
) + offset
;
566 fdata
->nosavedpc
= 0;
571 else if (cr_reg
!= -1 && (op
& 0xffff0000) == cr_reg
)
574 fdata
->cr_offset
= SIGNED_SHORT (op
) + offset
;
579 else if (op
== 0x48000005)
585 else if (op
== 0x48000004)
590 else if (((op
& 0xffff0000) == 0x801e0000 || /* lwz 0,NUM(r30), used
591 in V.4 -mrelocatable */
592 op
== 0x7fc0f214) && /* add r30,r0,r30, used
593 in V.4 -mrelocatable */
594 lr_reg
== 0x901e0000)
599 else if ((op
& 0xffff0000) == 0x3fc00000 || /* addis 30,0,foo@ha, used
600 in V.4 -mminimal-toc */
601 (op
& 0xffff0000) == 0x3bde0000)
602 { /* addi 30,30,foo@l */
606 else if ((op
& 0xfc000001) == 0x48000001)
610 fdata
->frameless
= 0;
611 /* Don't skip over the subroutine call if it is not within the first
612 three instructions of the prologue. */
613 if ((pc
- orig_pc
) > 8)
616 op
= read_memory_integer (pc
+ 4, 4);
618 /* At this point, make sure this is not a trampoline function
619 (a function that simply calls another functions, and nothing else).
620 If the next is not a nop, this branch was part of the function
623 if (op
== 0x4def7b82 || op
== 0) /* crorc 15, 15, 15 */
624 break; /* don't skip over
628 /* update stack pointer */
630 else if ((op
& 0xffff0000) == 0x94210000 || /* stu r1,NUM(r1) */
631 (op
& 0xffff0003) == 0xf8210001) /* stdu r1,NUM(r1) */
633 fdata
->frameless
= 0;
634 if ((op
& 0xffff0003) == 0xf8210001)
636 fdata
->offset
= SIGNED_SHORT (op
);
637 offset
= fdata
->offset
;
641 else if (op
== 0x7c21016e)
643 fdata
->frameless
= 0;
644 offset
= fdata
->offset
;
647 /* Load up minimal toc pointer */
649 else if ((op
>> 22) == 0x20f
650 && !minimal_toc_loaded
)
651 { /* l r31,... or l r30,... */
652 minimal_toc_loaded
= 1;
655 /* move parameters from argument registers to local variable
658 else if ((op
& 0xfc0007fe) == 0x7c000378 && /* mr(.) Rx,Ry */
659 (((op
>> 21) & 31) >= 3) && /* R3 >= Ry >= R10 */
660 (((op
>> 21) & 31) <= 10) &&
661 (((op
>> 16) & 31) >= fdata
->saved_gpr
)) /* Rx: local var reg */
665 /* store parameters in stack */
667 else if ((op
& 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
668 (op
& 0xfc1f0003) == 0xf8010000 || /* std rx,NUM(r1) */
669 (op
& 0xfc1f0000) == 0xd8010000 || /* stfd Rx,NUM(r1) */
670 (op
& 0xfc1f0000) == 0xfc010000) /* frsp, fp?,NUM(r1) */
674 /* store parameters in stack via frame pointer */
677 ((op
& 0xfc1f0000) == 0x901f0000 || /* st rx,NUM(r1) */
678 (op
& 0xfc1f0000) == 0xd81f0000 || /* stfd Rx,NUM(r1) */
679 (op
& 0xfc1f0000) == 0xfc1f0000))
680 { /* frsp, fp?,NUM(r1) */
683 /* Set up frame pointer */
685 else if (op
== 0x603f0000 /* oril r31, r1, 0x0 */
688 fdata
->frameless
= 0;
690 fdata
->alloca_reg
= 31;
693 /* Another way to set up the frame pointer. */
695 else if ((op
& 0xfc1fffff) == 0x38010000)
696 { /* addi rX, r1, 0x0 */
697 fdata
->frameless
= 0;
699 fdata
->alloca_reg
= (op
& ~0x38010000) >> 21;
705 /* Not a recognized prologue instruction.
706 Handle optimizer code motions into the prologue by continuing
707 the search if we have no valid frame yet or if the return
708 address is not yet saved in the frame. */
709 if (fdata
->frameless
== 0
710 && (lr_reg
== -1 || fdata
->nosavedpc
== 0))
713 if (op
== 0x4e800020 /* blr */
714 || op
== 0x4e800420) /* bctr */
715 /* Do not scan past epilogue in frameless functions or
718 if ((op
& 0xf4000000) == 0x40000000) /* bxx */
719 /* Never skip branches. */
722 if (num_skip_non_prologue_insns
++ > max_skip_non_prologue_insns
)
723 /* Do not scan too many insns, scanning insns is expensive with
727 /* Continue scanning. */
728 prev_insn_was_prologue_insn
= 0;
734 /* I have problems with skipping over __main() that I need to address
735 * sometime. Previously, I used to use misc_function_vector which
736 * didn't work as well as I wanted to be. -MGO */
738 /* If the first thing after skipping a prolog is a branch to a function,
739 this might be a call to an initializer in main(), introduced by gcc2.
740 We'd like to skip over it as well. Fortunately, xlc does some extra
741 work before calling a function right after a prologue, thus we can
742 single out such gcc2 behaviour. */
745 if ((op
& 0xfc000001) == 0x48000001)
746 { /* bl foo, an initializer function? */
747 op
= read_memory_integer (pc
+ 4, 4);
749 if (op
== 0x4def7b82)
750 { /* cror 0xf, 0xf, 0xf (nop) */
752 /* check and see if we are in main. If so, skip over this initializer
755 tmp
= find_pc_misc_function (pc
);
756 if (tmp
>= 0 && STREQ (misc_function_vector
[tmp
].name
, main_name ()))
762 fdata
->offset
= -fdata
->offset
;
763 return last_prologue_pc
;
767 /*************************************************************************
768 Support for creating pushing a dummy frame into the stack, and popping
770 *************************************************************************/
773 /* Pop the innermost frame, go back to the caller. */
776 rs6000_pop_frame (void)
778 CORE_ADDR pc
, lr
, sp
, prev_sp
, addr
; /* %pc, %lr, %sp */
779 struct rs6000_framedata fdata
;
780 struct frame_info
*frame
= get_current_frame ();
784 sp
= FRAME_FP (frame
);
786 if (PC_IN_CALL_DUMMY (frame
->pc
, frame
->frame
, frame
->frame
))
788 generic_pop_dummy_frame ();
789 flush_cached_frames ();
793 /* Make sure that all registers are valid. */
794 read_register_bytes (0, NULL
, REGISTER_BYTES
);
796 /* figure out previous %pc value. If the function is frameless, it is
797 still in the link register, otherwise walk the frames and retrieve the
798 saved %pc value in the previous frame. */
800 addr
= get_pc_function_start (frame
->pc
);
801 (void) skip_prologue (addr
, frame
->pc
, &fdata
);
803 wordsize
= TDEP
->wordsize
;
807 prev_sp
= read_memory_addr (sp
, wordsize
);
808 if (fdata
.lr_offset
== 0)
809 lr
= read_register (PPC_LR_REGNUM
);
811 lr
= read_memory_addr (prev_sp
+ fdata
.lr_offset
, wordsize
);
813 /* reset %pc value. */
814 write_register (PC_REGNUM
, lr
);
816 /* reset register values if any was saved earlier. */
818 if (fdata
.saved_gpr
!= -1)
820 addr
= prev_sp
+ fdata
.gpr_offset
;
821 for (ii
= fdata
.saved_gpr
; ii
<= 31; ++ii
)
823 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
)], wordsize
);
828 if (fdata
.saved_fpr
!= -1)
830 addr
= prev_sp
+ fdata
.fpr_offset
;
831 for (ii
= fdata
.saved_fpr
; ii
<= 31; ++ii
)
833 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
+ FP0_REGNUM
)], 8);
838 write_register (SP_REGNUM
, prev_sp
);
839 target_store_registers (-1);
840 flush_cached_frames ();
843 /* Fixup the call sequence of a dummy function, with the real function
844 address. Its arguments will be passed by gdb. */
847 rs6000_fix_call_dummy (char *dummyname
, CORE_ADDR pc
, CORE_ADDR fun
,
848 int nargs
, value_ptr
*args
, struct type
*type
,
851 #define TOC_ADDR_OFFSET 20
852 #define TARGET_ADDR_OFFSET 28
855 CORE_ADDR target_addr
;
857 if (rs6000_find_toc_address_hook
!= NULL
)
859 CORE_ADDR tocvalue
= (*rs6000_find_toc_address_hook
) (fun
);
860 write_register (PPC_TOC_REGNUM
, tocvalue
);
864 /* Pass the arguments in either registers, or in the stack. In RS/6000,
865 the first eight words of the argument list (that might be less than
866 eight parameters if some parameters occupy more than one word) are
867 passed in r3..r10 registers. float and double parameters are
868 passed in fpr's, in addition to that. Rest of the parameters if any
869 are passed in user stack. There might be cases in which half of the
870 parameter is copied into registers, the other half is pushed into
873 Stack must be aligned on 64-bit boundaries when synthesizing
876 If the function is returning a structure, then the return address is passed
877 in r3, then the first 7 words of the parameters can be passed in registers,
881 rs6000_push_arguments (int nargs
, value_ptr
*args
, CORE_ADDR sp
,
882 int struct_return
, CORE_ADDR struct_addr
)
886 int argno
; /* current argument number */
887 int argbytes
; /* current argument byte */
889 int f_argno
= 0; /* current floating point argno */
890 int wordsize
= TDEP
->wordsize
;
897 /* The first eight words of ther arguments are passed in registers. Copy
900 If the function is returning a `struct', then the first word (which
901 will be passed in r3) is used for struct return address. In that
902 case we should advance one word and start from r4 register to copy
905 ii
= struct_return
? 1 : 0;
908 effectively indirect call... gcc does...
910 return_val example( float, int);
913 float in fp0, int in r3
914 offset of stack on overflow 8/16
915 for varargs, must go by type.
917 float in r3&r4, int in r5
918 offset of stack on overflow different
920 return in r3 or f0. If no float, must study how gcc emulates floats;
921 pay attention to arg promotion.
922 User may have to cast\args to handle promotion correctly
923 since gdb won't know if prototype supplied or not.
926 for (argno
= 0, argbytes
= 0; argno
< nargs
&& ii
< 8; ++ii
)
928 int reg_size
= REGISTER_RAW_SIZE (ii
+ 3);
931 type
= check_typedef (VALUE_TYPE (arg
));
932 len
= TYPE_LENGTH (type
);
934 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
937 /* floating point arguments are passed in fpr's, as well as gpr's.
938 There are 13 fpr's reserved for passing parameters. At this point
939 there is no way we would run out of them. */
943 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
945 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
+ 1 + f_argno
)],
946 VALUE_CONTENTS (arg
),
954 /* Argument takes more than one register. */
955 while (argbytes
< len
)
957 memset (®isters
[REGISTER_BYTE (ii
+ 3)], 0, reg_size
);
958 memcpy (®isters
[REGISTER_BYTE (ii
+ 3)],
959 ((char *) VALUE_CONTENTS (arg
)) + argbytes
,
960 (len
- argbytes
) > reg_size
961 ? reg_size
: len
- argbytes
);
962 ++ii
, argbytes
+= reg_size
;
965 goto ran_out_of_registers_for_arguments
;
971 { /* Argument can fit in one register. No problem. */
972 int adj
= TARGET_BYTE_ORDER
== BIG_ENDIAN
? reg_size
- len
: 0;
973 memset (®isters
[REGISTER_BYTE (ii
+ 3)], 0, reg_size
);
974 memcpy ((char *)®isters
[REGISTER_BYTE (ii
+ 3)] + adj
,
975 VALUE_CONTENTS (arg
), len
);
980 ran_out_of_registers_for_arguments
:
982 saved_sp
= read_sp ();
983 #ifndef ELF_OBJECT_FORMAT
984 /* location for 8 parameters are always reserved. */
987 /* another six words for back chain, TOC register, link register, etc. */
990 /* stack pointer must be quadword aligned */
994 /* if there are more arguments, allocate space for them in
995 the stack, then push them starting from the ninth one. */
997 if ((argno
< nargs
) || argbytes
)
1003 space
+= ((len
- argbytes
+ 3) & -4);
1009 for (; jj
< nargs
; ++jj
)
1011 value_ptr val
= args
[jj
];
1012 space
+= ((TYPE_LENGTH (VALUE_TYPE (val
))) + 3) & -4;
1015 /* add location required for the rest of the parameters */
1016 space
= (space
+ 15) & -16;
1019 /* This is another instance we need to be concerned about securing our
1020 stack space. If we write anything underneath %sp (r1), we might conflict
1021 with the kernel who thinks he is free to use this area. So, update %sp
1022 first before doing anything else. */
1024 write_register (SP_REGNUM
, sp
);
1026 /* if the last argument copied into the registers didn't fit there
1027 completely, push the rest of it into stack. */
1031 write_memory (sp
+ 24 + (ii
* 4),
1032 ((char *) VALUE_CONTENTS (arg
)) + argbytes
,
1035 ii
+= ((len
- argbytes
+ 3) & -4) / 4;
1038 /* push the rest of the arguments into stack. */
1039 for (; argno
< nargs
; ++argno
)
1043 type
= check_typedef (VALUE_TYPE (arg
));
1044 len
= TYPE_LENGTH (type
);
1047 /* float types should be passed in fpr's, as well as in the stack. */
1048 if (TYPE_CODE (type
) == TYPE_CODE_FLT
&& f_argno
< 13)
1053 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
1055 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
+ 1 + f_argno
)],
1056 VALUE_CONTENTS (arg
),
1061 write_memory (sp
+ 24 + (ii
* 4), (char *) VALUE_CONTENTS (arg
), len
);
1062 ii
+= ((len
+ 3) & -4) / 4;
1066 /* Secure stack areas first, before doing anything else. */
1067 write_register (SP_REGNUM
, sp
);
1069 /* set back chain properly */
1070 store_address (tmp_buffer
, 4, saved_sp
);
1071 write_memory (sp
, tmp_buffer
, 4);
1073 target_store_registers (-1);
1077 /* Function: ppc_push_return_address (pc, sp)
1078 Set up the return address for the inferior function call. */
1081 ppc_push_return_address (CORE_ADDR pc
, CORE_ADDR sp
)
1083 write_register (PPC_LR_REGNUM
, CALL_DUMMY_ADDRESS ());
1087 /* Extract a function return value of type TYPE from raw register array
1088 REGBUF, and copy that return value into VALBUF in virtual format. */
1091 rs6000_extract_return_value (struct type
*valtype
, char *regbuf
, char *valbuf
)
1095 if (TYPE_CODE (valtype
) == TYPE_CODE_FLT
)
1100 /* floats and doubles are returned in fpr1. fpr's have a size of 8 bytes.
1101 We need to truncate the return value into float size (4 byte) if
1104 if (TYPE_LENGTH (valtype
) > 4) /* this is a double */
1106 ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)],
1107 TYPE_LENGTH (valtype
));
1110 memcpy (&dd
, ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)], 8);
1112 memcpy (valbuf
, &ff
, sizeof (float));
1117 /* return value is copied starting from r3. */
1118 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
1119 && TYPE_LENGTH (valtype
) < REGISTER_RAW_SIZE (3))
1120 offset
= REGISTER_RAW_SIZE (3) - TYPE_LENGTH (valtype
);
1123 regbuf
+ REGISTER_BYTE (3) + offset
,
1124 TYPE_LENGTH (valtype
));
1128 /* Keep structure return address in this variable.
1129 FIXME: This is a horrid kludge which should not be allowed to continue
1130 living. This only allows a single nested call to a structure-returning
1131 function. Come on, guys! -- gnu@cygnus.com, Aug 92 */
1133 static CORE_ADDR rs6000_struct_return_address
;
1135 /* Return whether handle_inferior_event() should proceed through code
1136 starting at PC in function NAME when stepping.
1138 The AIX -bbigtoc linker option generates functions @FIX0, @FIX1, etc. to
1139 handle memory references that are too distant to fit in instructions
1140 generated by the compiler. For example, if 'foo' in the following
1145 is greater than 32767, the linker might replace the lwz with a branch to
1146 somewhere in @FIX1 that does the load in 2 instructions and then branches
1147 back to where execution should continue.
1149 GDB should silently step over @FIX code, just like AIX dbx does.
1150 Unfortunately, the linker uses the "b" instruction for the branches,
1151 meaning that the link register doesn't get set. Therefore, GDB's usual
1152 step_over_function() mechanism won't work.
1154 Instead, use the IN_SOLIB_RETURN_TRAMPOLINE and SKIP_TRAMPOLINE_CODE hooks
1155 in handle_inferior_event() to skip past @FIX code. */
1158 rs6000_in_solib_return_trampoline (CORE_ADDR pc
, char *name
)
1160 return name
&& !strncmp (name
, "@FIX", 4);
1163 /* Skip code that the user doesn't want to see when stepping:
1165 1. Indirect function calls use a piece of trampoline code to do context
1166 switching, i.e. to set the new TOC table. Skip such code if we are on
1167 its first instruction (as when we have single-stepped to here).
1169 2. Skip shared library trampoline code (which is different from
1170 indirect function call trampolines).
1172 3. Skip bigtoc fixup code.
1174 Result is desired PC to step until, or NULL if we are not in
1175 code that should be skipped. */
1178 rs6000_skip_trampoline_code (CORE_ADDR pc
)
1180 register unsigned int ii
, op
;
1182 CORE_ADDR solib_target_pc
;
1183 struct minimal_symbol
*msymbol
;
1185 static unsigned trampoline_code
[] =
1187 0x800b0000, /* l r0,0x0(r11) */
1188 0x90410014, /* st r2,0x14(r1) */
1189 0x7c0903a6, /* mtctr r0 */
1190 0x804b0004, /* l r2,0x4(r11) */
1191 0x816b0008, /* l r11,0x8(r11) */
1192 0x4e800420, /* bctr */
1193 0x4e800020, /* br */
1197 /* Check for bigtoc fixup code. */
1198 msymbol
= lookup_minimal_symbol_by_pc (pc
);
1199 if (msymbol
&& rs6000_in_solib_return_trampoline (pc
, SYMBOL_NAME (msymbol
)))
1201 /* Double-check that the third instruction from PC is relative "b". */
1202 op
= read_memory_integer (pc
+ 8, 4);
1203 if ((op
& 0xfc000003) == 0x48000000)
1205 /* Extract bits 6-29 as a signed 24-bit relative word address and
1206 add it to the containing PC. */
1207 rel
= ((int)(op
<< 6) >> 6);
1208 return pc
+ 8 + rel
;
1212 /* If pc is in a shared library trampoline, return its target. */
1213 solib_target_pc
= find_solib_trampoline_target (pc
);
1214 if (solib_target_pc
)
1215 return solib_target_pc
;
1217 for (ii
= 0; trampoline_code
[ii
]; ++ii
)
1219 op
= read_memory_integer (pc
+ (ii
* 4), 4);
1220 if (op
!= trampoline_code
[ii
])
1223 ii
= read_register (11); /* r11 holds destination addr */
1224 pc
= read_memory_addr (ii
, TDEP
->wordsize
); /* (r11) value */
1228 /* Determines whether the function FI has a frame on the stack or not. */
1231 rs6000_frameless_function_invocation (struct frame_info
*fi
)
1233 CORE_ADDR func_start
;
1234 struct rs6000_framedata fdata
;
1236 /* Don't even think about framelessness except on the innermost frame
1237 or if the function was interrupted by a signal. */
1238 if (fi
->next
!= NULL
&& !fi
->next
->signal_handler_caller
)
1241 func_start
= get_pc_function_start (fi
->pc
);
1243 /* If we failed to find the start of the function, it is a mistake
1244 to inspect the instructions. */
1248 /* A frame with a zero PC is usually created by dereferencing a NULL
1249 function pointer, normally causing an immediate core dump of the
1250 inferior. Mark function as frameless, as the inferior has no chance
1251 of setting up a stack frame. */
1258 (void) skip_prologue (func_start
, fi
->pc
, &fdata
);
1259 return fdata
.frameless
;
1262 /* Return the PC saved in a frame */
1265 rs6000_frame_saved_pc (struct frame_info
*fi
)
1267 CORE_ADDR func_start
;
1268 struct rs6000_framedata fdata
;
1269 int wordsize
= TDEP
->wordsize
;
1271 if (fi
->signal_handler_caller
)
1272 return read_memory_addr (fi
->frame
+ SIG_FRAME_PC_OFFSET
, wordsize
);
1274 if (PC_IN_CALL_DUMMY (fi
->pc
, fi
->frame
, fi
->frame
))
1275 return generic_read_register_dummy (fi
->pc
, fi
->frame
, PC_REGNUM
);
1277 func_start
= get_pc_function_start (fi
->pc
);
1279 /* If we failed to find the start of the function, it is a mistake
1280 to inspect the instructions. */
1284 (void) skip_prologue (func_start
, fi
->pc
, &fdata
);
1286 if (fdata
.lr_offset
== 0 && fi
->next
!= NULL
)
1288 if (fi
->next
->signal_handler_caller
)
1289 return read_memory_addr (fi
->next
->frame
+ SIG_FRAME_LR_OFFSET
,
1292 return read_memory_addr (FRAME_CHAIN (fi
) + DEFAULT_LR_SAVE
,
1296 if (fdata
.lr_offset
== 0)
1297 return read_register (PPC_LR_REGNUM
);
1299 return read_memory_addr (FRAME_CHAIN (fi
) + fdata
.lr_offset
, wordsize
);
1302 /* If saved registers of frame FI are not known yet, read and cache them.
1303 &FDATAP contains rs6000_framedata; TDATAP can be NULL,
1304 in which case the framedata are read. */
1307 frame_get_saved_regs (struct frame_info
*fi
, struct rs6000_framedata
*fdatap
)
1309 CORE_ADDR frame_addr
;
1310 struct rs6000_framedata work_fdata
;
1311 int wordsize
= TDEP
->wordsize
;
1318 fdatap
= &work_fdata
;
1319 (void) skip_prologue (get_pc_function_start (fi
->pc
), fi
->pc
, fdatap
);
1322 frame_saved_regs_zalloc (fi
);
1324 /* If there were any saved registers, figure out parent's stack
1326 /* The following is true only if the frame doesn't have a call to
1329 if (fdatap
->saved_fpr
== 0 && fdatap
->saved_gpr
== 0
1330 && fdatap
->lr_offset
== 0 && fdatap
->cr_offset
== 0)
1332 else if (fi
->prev
&& fi
->prev
->frame
)
1333 frame_addr
= fi
->prev
->frame
;
1335 frame_addr
= read_memory_addr (fi
->frame
, wordsize
);
1337 /* if != -1, fdatap->saved_fpr is the smallest number of saved_fpr.
1338 All fpr's from saved_fpr to fp31 are saved. */
1340 if (fdatap
->saved_fpr
>= 0)
1343 CORE_ADDR fpr_addr
= frame_addr
+ fdatap
->fpr_offset
;
1344 for (i
= fdatap
->saved_fpr
; i
< 32; i
++)
1346 fi
->saved_regs
[FP0_REGNUM
+ i
] = fpr_addr
;
1351 /* if != -1, fdatap->saved_gpr is the smallest number of saved_gpr.
1352 All gpr's from saved_gpr to gpr31 are saved. */
1354 if (fdatap
->saved_gpr
>= 0)
1357 CORE_ADDR gpr_addr
= frame_addr
+ fdatap
->gpr_offset
;
1358 for (i
= fdatap
->saved_gpr
; i
< 32; i
++)
1360 fi
->saved_regs
[i
] = gpr_addr
;
1361 gpr_addr
+= wordsize
;
1365 /* If != 0, fdatap->cr_offset is the offset from the frame that holds
1367 if (fdatap
->cr_offset
!= 0)
1368 fi
->saved_regs
[PPC_CR_REGNUM
] = frame_addr
+ fdatap
->cr_offset
;
1370 /* If != 0, fdatap->lr_offset is the offset from the frame that holds
1372 if (fdatap
->lr_offset
!= 0)
1373 fi
->saved_regs
[PPC_LR_REGNUM
] = frame_addr
+ fdatap
->lr_offset
;
1376 /* Return the address of a frame. This is the inital %sp value when the frame
1377 was first allocated. For functions calling alloca(), it might be saved in
1378 an alloca register. */
1381 frame_initial_stack_address (struct frame_info
*fi
)
1384 struct rs6000_framedata fdata
;
1385 struct frame_info
*callee_fi
;
1387 /* if the initial stack pointer (frame address) of this frame is known,
1390 if (fi
->extra_info
->initial_sp
)
1391 return fi
->extra_info
->initial_sp
;
1393 /* find out if this function is using an alloca register.. */
1395 (void) skip_prologue (get_pc_function_start (fi
->pc
), fi
->pc
, &fdata
);
1397 /* if saved registers of this frame are not known yet, read and cache them. */
1399 if (!fi
->saved_regs
)
1400 frame_get_saved_regs (fi
, &fdata
);
1402 /* If no alloca register used, then fi->frame is the value of the %sp for
1403 this frame, and it is good enough. */
1405 if (fdata
.alloca_reg
< 0)
1407 fi
->extra_info
->initial_sp
= fi
->frame
;
1408 return fi
->extra_info
->initial_sp
;
1411 /* This function has an alloca register. If this is the top-most frame
1412 (with the lowest address), the value in alloca register is good. */
1415 return fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1417 /* Otherwise, this is a caller frame. Callee has usually already saved
1418 registers, but there are exceptions (such as when the callee
1419 has no parameters). Find the address in which caller's alloca
1420 register is saved. */
1422 for (callee_fi
= fi
->next
; callee_fi
; callee_fi
= callee_fi
->next
)
1425 if (!callee_fi
->saved_regs
)
1426 frame_get_saved_regs (callee_fi
, NULL
);
1428 /* this is the address in which alloca register is saved. */
1430 tmpaddr
= callee_fi
->saved_regs
[fdata
.alloca_reg
];
1433 fi
->extra_info
->initial_sp
=
1434 read_memory_addr (tmpaddr
, TDEP
->wordsize
);
1435 return fi
->extra_info
->initial_sp
;
1438 /* Go look into deeper levels of the frame chain to see if any one of
1439 the callees has saved alloca register. */
1442 /* If alloca register was not saved, by the callee (or any of its callees)
1443 then the value in the register is still good. */
1445 fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1446 return fi
->extra_info
->initial_sp
;
1449 /* Describe the pointer in each stack frame to the previous stack frame
1452 /* FRAME_CHAIN takes a frame's nominal address
1453 and produces the frame's chain-pointer. */
1455 /* In the case of the RS/6000, the frame's nominal address
1456 is the address of a 4-byte word containing the calling frame's address. */
1459 rs6000_frame_chain (struct frame_info
*thisframe
)
1461 CORE_ADDR fp
, fpp
, lr
;
1462 int wordsize
= TDEP
->wordsize
;
1464 if (PC_IN_CALL_DUMMY (thisframe
->pc
, thisframe
->frame
, thisframe
->frame
))
1465 return thisframe
->frame
; /* dummy frame same as caller's frame */
1467 if (inside_entry_file (thisframe
->pc
) ||
1468 thisframe
->pc
== entry_point_address ())
1471 if (thisframe
->signal_handler_caller
)
1472 fp
= read_memory_addr (thisframe
->frame
+ SIG_FRAME_FP_OFFSET
,
1474 else if (thisframe
->next
!= NULL
1475 && thisframe
->next
->signal_handler_caller
1476 && FRAMELESS_FUNCTION_INVOCATION (thisframe
))
1477 /* A frameless function interrupted by a signal did not change the
1479 fp
= FRAME_FP (thisframe
);
1481 fp
= read_memory_addr ((thisframe
)->frame
, wordsize
);
1483 lr
= read_register (PPC_LR_REGNUM
);
1484 if (lr
== entry_point_address ())
1485 if (fp
!= 0 && (fpp
= read_memory_addr (fp
, wordsize
)) != 0)
1486 if (PC_IN_CALL_DUMMY (lr
, fpp
, fpp
))
1492 /* Return the size of register REG when words are WORDSIZE bytes long. If REG
1493 isn't available with that word size, return 0. */
1496 regsize (const struct reg
*reg
, int wordsize
)
1498 return wordsize
== 8 ? reg
->sz64
: reg
->sz32
;
1501 /* Return the name of register number N, or null if no such register exists
1502 in the current architecture. */
1505 rs6000_register_name (int n
)
1507 struct gdbarch_tdep
*tdep
= TDEP
;
1508 const struct reg
*reg
= tdep
->regs
+ n
;
1510 if (!regsize (reg
, tdep
->wordsize
))
1515 /* Index within `registers' of the first byte of the space for
1519 rs6000_register_byte (int n
)
1521 return TDEP
->regoff
[n
];
1524 /* Return the number of bytes of storage in the actual machine representation
1525 for register N if that register is available, else return 0. */
1528 rs6000_register_raw_size (int n
)
1530 struct gdbarch_tdep
*tdep
= TDEP
;
1531 const struct reg
*reg
= tdep
->regs
+ n
;
1532 return regsize (reg
, tdep
->wordsize
);
1535 /* Number of bytes of storage in the program's representation
1539 rs6000_register_virtual_size (int n
)
1541 return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (n
));
1544 /* Return the GDB type object for the "standard" data type
1545 of data in register N. */
1547 static struct type
*
1548 rs6000_register_virtual_type (int n
)
1550 struct gdbarch_tdep
*tdep
= TDEP
;
1551 const struct reg
*reg
= tdep
->regs
+ n
;
1553 return reg
->fpr
? builtin_type_double
:
1554 regsize (reg
, tdep
->wordsize
) == 8 ? builtin_type_int64
:
1558 /* For the PowerPC, it appears that the debug info marks float parameters as
1559 floats regardless of whether the function is prototyped, but the actual
1560 values are always passed in as doubles. Tell gdb to always assume that
1561 floats are passed as doubles and then converted in the callee. */
1564 rs6000_coerce_float_to_double (struct type
*formal
, struct type
*actual
)
1569 /* Return whether register N requires conversion when moving from raw format
1572 The register format for RS/6000 floating point registers is always
1573 double, we need a conversion if the memory format is float. */
1576 rs6000_register_convertible (int n
)
1578 const struct reg
*reg
= TDEP
->regs
+ n
;
1582 /* Convert data from raw format for register N in buffer FROM
1583 to virtual format with type TYPE in buffer TO. */
1586 rs6000_register_convert_to_virtual (int n
, struct type
*type
,
1587 char *from
, char *to
)
1589 if (TYPE_LENGTH (type
) != REGISTER_RAW_SIZE (n
))
1591 double val
= extract_floating (from
, REGISTER_RAW_SIZE (n
));
1592 store_floating (to
, TYPE_LENGTH (type
), val
);
1595 memcpy (to
, from
, REGISTER_RAW_SIZE (n
));
1598 /* Convert data from virtual format with type TYPE in buffer FROM
1599 to raw format for register N in buffer TO. */
1602 rs6000_register_convert_to_raw (struct type
*type
, int n
,
1603 char *from
, char *to
)
1605 if (TYPE_LENGTH (type
) != REGISTER_RAW_SIZE (n
))
1607 double val
= extract_floating (from
, TYPE_LENGTH (type
));
1608 store_floating (to
, REGISTER_RAW_SIZE (n
), val
);
1611 memcpy (to
, from
, REGISTER_RAW_SIZE (n
));
1614 /* Store the address of the place in which to copy the structure the
1615 subroutine will return. This is called from call_function.
1617 In RS/6000, struct return addresses are passed as an extra parameter in r3.
1618 In function return, callee is not responsible of returning this address
1619 back. Since gdb needs to find it, we will store in a designated variable
1620 `rs6000_struct_return_address'. */
1623 rs6000_store_struct_return (CORE_ADDR addr
, CORE_ADDR sp
)
1625 write_register (3, addr
);
1626 rs6000_struct_return_address
= addr
;
1629 /* Write into appropriate registers a function return value
1630 of type TYPE, given in virtual format. */
1633 rs6000_store_return_value (struct type
*type
, char *valbuf
)
1635 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
1637 /* Floating point values are returned starting from FPR1 and up.
1638 Say a double_double_double type could be returned in
1639 FPR1/FPR2/FPR3 triple. */
1641 write_register_bytes (REGISTER_BYTE (FP0_REGNUM
+ 1), valbuf
,
1642 TYPE_LENGTH (type
));
1644 /* Everything else is returned in GPR3 and up. */
1645 write_register_bytes (REGISTER_BYTE (PPC_GP0_REGNUM
+ 3), valbuf
,
1646 TYPE_LENGTH (type
));
1649 /* Extract from an array REGBUF containing the (raw) register state
1650 the address in which a function should return its structure value,
1651 as a CORE_ADDR (or an expression that can be used as one). */
1654 rs6000_extract_struct_value_address (char *regbuf
)
1656 return rs6000_struct_return_address
;
1659 /* Return whether PC is in a dummy function call.
1661 FIXME: This just checks for the end of the stack, which is broken
1662 for things like stepping through gcc nested function stubs. */
1665 rs6000_pc_in_call_dummy (CORE_ADDR pc
, CORE_ADDR sp
, CORE_ADDR fp
)
1667 return sp
< pc
&& pc
< fp
;
1670 /* Hook called when a new child process is started. */
1673 rs6000_create_inferior (int pid
)
1675 if (rs6000_set_host_arch_hook
)
1676 rs6000_set_host_arch_hook (pid
);
1679 /* Support for CONVERT_FROM_FUNC_PTR_ADDR(ADDR).
1681 Usually a function pointer's representation is simply the address
1682 of the function. On the RS/6000 however, a function pointer is
1683 represented by a pointer to a TOC entry. This TOC entry contains
1684 three words, the first word is the address of the function, the
1685 second word is the TOC pointer (r2), and the third word is the
1686 static chain value. Throughout GDB it is currently assumed that a
1687 function pointer contains the address of the function, which is not
1688 easy to fix. In addition, the conversion of a function address to
1689 a function pointer would require allocation of a TOC entry in the
1690 inferior's memory space, with all its drawbacks. To be able to
1691 call C++ virtual methods in the inferior (which are called via
1692 function pointers), find_function_addr uses this function to get the
1693 function address from a function pointer. */
1695 /* Return real function address if ADDR (a function pointer) is in the data
1696 space and is therefore a special function pointer. */
1699 rs6000_convert_from_func_ptr_addr (CORE_ADDR addr
)
1701 struct obj_section
*s
;
1703 s
= find_pc_section (addr
);
1704 if (s
&& s
->the_bfd_section
->flags
& SEC_CODE
)
1707 /* ADDR is in the data space, so it's a special function pointer. */
1708 return read_memory_addr (addr
, TDEP
->wordsize
);
1712 /* Handling the various POWER/PowerPC variants. */
1715 /* The arrays here called registers_MUMBLE hold information about available
1718 For each family of PPC variants, I've tried to isolate out the
1719 common registers and put them up front, so that as long as you get
1720 the general family right, GDB will correctly identify the registers
1721 common to that family. The common register sets are:
1723 For the 60x family: hid0 hid1 iabr dabr pir
1725 For the 505 and 860 family: eie eid nri
1727 For the 403 and 403GC: icdbdr esr dear evpr cdbcr tsr tcr pit tbhi
1728 tblo srr2 srr3 dbsr dbcr iac1 iac2 dac1 dac2 dccr iccr pbl1
1731 Most of these register groups aren't anything formal. I arrived at
1732 them by looking at the registers that occurred in more than one
1735 /* Convenience macros for populating register arrays. */
1737 /* Within another macro, convert S to a string. */
1741 /* Return a struct reg defining register NAME that's 32 bits on 32-bit systems
1742 and 64 bits on 64-bit systems. */
1743 #define R(name) { STR(name), 4, 8, 0 }
1745 /* Return a struct reg defining register NAME that's 32 bits on all
1747 #define R4(name) { STR(name), 4, 4, 0 }
1749 /* Return a struct reg defining register NAME that's 64 bits on all
1751 #define R8(name) { STR(name), 8, 8, 0 }
1753 /* Return a struct reg defining floating-point register NAME. */
1754 #define F(name) { STR(name), 8, 8, 1 }
1756 /* Return a struct reg defining register NAME that's 32 bits on 32-bit
1757 systems and that doesn't exist on 64-bit systems. */
1758 #define R32(name) { STR(name), 4, 0, 0 }
1760 /* Return a struct reg defining register NAME that's 64 bits on 64-bit
1761 systems and that doesn't exist on 32-bit systems. */
1762 #define R64(name) { STR(name), 0, 8, 0 }
1764 /* Return a struct reg placeholder for a register that doesn't exist. */
1765 #define R0 { 0, 0, 0, 0 }
1767 /* UISA registers common across all architectures, including POWER. */
1769 #define COMMON_UISA_REGS \
1770 /* 0 */ R(r0), R(r1), R(r2), R(r3), R(r4), R(r5), R(r6), R(r7), \
1771 /* 8 */ R(r8), R(r9), R(r10),R(r11),R(r12),R(r13),R(r14),R(r15), \
1772 /* 16 */ R(r16),R(r17),R(r18),R(r19),R(r20),R(r21),R(r22),R(r23), \
1773 /* 24 */ R(r24),R(r25),R(r26),R(r27),R(r28),R(r29),R(r30),R(r31), \
1774 /* 32 */ F(f0), F(f1), F(f2), F(f3), F(f4), F(f5), F(f6), F(f7), \
1775 /* 40 */ F(f8), F(f9), F(f10),F(f11),F(f12),F(f13),F(f14),F(f15), \
1776 /* 48 */ F(f16),F(f17),F(f18),F(f19),F(f20),F(f21),F(f22),F(f23), \
1777 /* 56 */ F(f24),F(f25),F(f26),F(f27),F(f28),F(f29),F(f30),F(f31), \
1778 /* 64 */ R(pc), R(ps)
1780 /* UISA-level SPRs for PowerPC. */
1781 #define PPC_UISA_SPRS \
1782 /* 66 */ R4(cr), R(lr), R(ctr), R4(xer), R0
1784 /* Segment registers, for PowerPC. */
1785 #define PPC_SEGMENT_REGS \
1786 /* 71 */ R32(sr0), R32(sr1), R32(sr2), R32(sr3), \
1787 /* 75 */ R32(sr4), R32(sr5), R32(sr6), R32(sr7), \
1788 /* 79 */ R32(sr8), R32(sr9), R32(sr10), R32(sr11), \
1789 /* 83 */ R32(sr12), R32(sr13), R32(sr14), R32(sr15)
1791 /* OEA SPRs for PowerPC. */
1792 #define PPC_OEA_SPRS \
1794 /* 88 */ R(ibat0u), R(ibat0l), R(ibat1u), R(ibat1l), \
1795 /* 92 */ R(ibat2u), R(ibat2l), R(ibat3u), R(ibat3l), \
1796 /* 96 */ R(dbat0u), R(dbat0l), R(dbat1u), R(dbat1l), \
1797 /* 100 */ R(dbat2u), R(dbat2l), R(dbat3u), R(dbat3l), \
1798 /* 104 */ R(sdr1), R64(asr), R(dar), R4(dsisr), \
1799 /* 108 */ R(sprg0), R(sprg1), R(sprg2), R(sprg3), \
1800 /* 112 */ R(srr0), R(srr1), R(tbl), R(tbu), \
1801 /* 116 */ R4(dec), R(dabr), R4(ear)
1803 /* IBM POWER (pre-PowerPC) architecture, user-level view. We only cover
1804 user-level SPR's. */
1805 static const struct reg registers_power
[] =
1808 /* 66 */ R4(cnd
), R(lr
), R(cnt
), R4(xer
), R4(mq
)
1811 /* PowerPC UISA - a PPC processor as viewed by user-level code. A UISA-only
1812 view of the PowerPC. */
1813 static const struct reg registers_powerpc
[] =
1819 /* IBM PowerPC 403. */
1820 static const struct reg registers_403
[] =
1826 /* 119 */ R(icdbdr
), R(esr
), R(dear
), R(evpr
),
1827 /* 123 */ R(cdbcr
), R(tsr
), R(tcr
), R(pit
),
1828 /* 127 */ R(tbhi
), R(tblo
), R(srr2
), R(srr3
),
1829 /* 131 */ R(dbsr
), R(dbcr
), R(iac1
), R(iac2
),
1830 /* 135 */ R(dac1
), R(dac2
), R(dccr
), R(iccr
),
1831 /* 139 */ R(pbl1
), R(pbu1
), R(pbl2
), R(pbu2
)
1834 /* IBM PowerPC 403GC. */
1835 static const struct reg registers_403GC
[] =
1841 /* 119 */ R(icdbdr
), R(esr
), R(dear
), R(evpr
),
1842 /* 123 */ R(cdbcr
), R(tsr
), R(tcr
), R(pit
),
1843 /* 127 */ R(tbhi
), R(tblo
), R(srr2
), R(srr3
),
1844 /* 131 */ R(dbsr
), R(dbcr
), R(iac1
), R(iac2
),
1845 /* 135 */ R(dac1
), R(dac2
), R(dccr
), R(iccr
),
1846 /* 139 */ R(pbl1
), R(pbu1
), R(pbl2
), R(pbu2
),
1847 /* 143 */ R(zpr
), R(pid
), R(sgr
), R(dcwr
),
1848 /* 147 */ R(tbhu
), R(tblu
)
1851 /* Motorola PowerPC 505. */
1852 static const struct reg registers_505
[] =
1858 /* 119 */ R(eie
), R(eid
), R(nri
)
1861 /* Motorola PowerPC 860 or 850. */
1862 static const struct reg registers_860
[] =
1868 /* 119 */ R(eie
), R(eid
), R(nri
), R(cmpa
),
1869 /* 123 */ R(cmpb
), R(cmpc
), R(cmpd
), R(icr
),
1870 /* 127 */ R(der
), R(counta
), R(countb
), R(cmpe
),
1871 /* 131 */ R(cmpf
), R(cmpg
), R(cmph
), R(lctrl1
),
1872 /* 135 */ R(lctrl2
), R(ictrl
), R(bar
), R(ic_cst
),
1873 /* 139 */ R(ic_adr
), R(ic_dat
), R(dc_cst
), R(dc_adr
),
1874 /* 143 */ R(dc_dat
), R(dpdr
), R(dpir
), R(immr
),
1875 /* 147 */ R(mi_ctr
), R(mi_ap
), R(mi_epn
), R(mi_twc
),
1876 /* 151 */ R(mi_rpn
), R(md_ctr
), R(m_casid
), R(md_ap
),
1877 /* 155 */ R(md_epn
), R(md_twb
), R(md_twc
), R(md_rpn
),
1878 /* 159 */ R(m_tw
), R(mi_dbcam
), R(mi_dbram0
), R(mi_dbram1
),
1879 /* 163 */ R(md_dbcam
), R(md_dbram0
), R(md_dbram1
)
1882 /* Motorola PowerPC 601. Note that the 601 has different register numbers
1883 for reading and writing RTCU and RTCL. However, how one reads and writes a
1884 register is the stub's problem. */
1885 static const struct reg registers_601
[] =
1891 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1892 /* 123 */ R(pir
), R(mq
), R(rtcu
), R(rtcl
)
1895 /* Motorola PowerPC 602. */
1896 static const struct reg registers_602
[] =
1902 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R0
,
1903 /* 123 */ R0
, R(tcr
), R(ibr
), R(esassr
),
1904 /* 127 */ R(sebr
), R(ser
), R(sp
), R(lt
)
1907 /* Motorola/IBM PowerPC 603 or 603e. */
1908 static const struct reg registers_603
[] =
1914 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R0
,
1915 /* 123 */ R0
, R(dmiss
), R(dcmp
), R(hash1
),
1916 /* 127 */ R(hash2
), R(imiss
), R(icmp
), R(rpa
)
1919 /* Motorola PowerPC 604 or 604e. */
1920 static const struct reg registers_604
[] =
1926 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1927 /* 123 */ R(pir
), R(mmcr0
), R(pmc1
), R(pmc2
),
1928 /* 127 */ R(sia
), R(sda
)
1931 /* Motorola/IBM PowerPC 750 or 740. */
1932 static const struct reg registers_750
[] =
1938 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1939 /* 123 */ R0
, R(ummcr0
), R(upmc1
), R(upmc2
),
1940 /* 127 */ R(usia
), R(ummcr1
), R(upmc3
), R(upmc4
),
1941 /* 131 */ R(mmcr0
), R(pmc1
), R(pmc2
), R(sia
),
1942 /* 135 */ R(mmcr1
), R(pmc3
), R(pmc4
), R(l2cr
),
1943 /* 139 */ R(ictc
), R(thrm1
), R(thrm2
), R(thrm3
)
1947 /* Information about a particular processor variant. */
1951 /* Name of this variant. */
1954 /* English description of the variant. */
1957 /* bfd_arch_info.arch corresponding to variant. */
1958 enum bfd_architecture arch
;
1960 /* bfd_arch_info.mach corresponding to variant. */
1963 /* Table of register names; registers[R] is the name of the register
1966 const struct reg
*regs
;
1969 #define num_registers(list) (sizeof (list) / sizeof((list)[0]))
1972 /* Information in this table comes from the following web sites:
1973 IBM: http://www.chips.ibm.com:80/products/embedded/
1974 Motorola: http://www.mot.com/SPS/PowerPC/
1976 I'm sure I've got some of the variant descriptions not quite right.
1977 Please report any inaccuracies you find to GDB's maintainer.
1979 If you add entries to this table, please be sure to allow the new
1980 value as an argument to the --with-cpu flag, in configure.in. */
1982 static const struct variant variants
[] =
1984 {"powerpc", "PowerPC user-level", bfd_arch_powerpc
,
1985 bfd_mach_ppc
, num_registers (registers_powerpc
), registers_powerpc
},
1986 {"power", "POWER user-level", bfd_arch_rs6000
,
1987 bfd_mach_rs6k
, num_registers (registers_power
), registers_power
},
1988 {"403", "IBM PowerPC 403", bfd_arch_powerpc
,
1989 bfd_mach_ppc_403
, num_registers (registers_403
), registers_403
},
1990 {"601", "Motorola PowerPC 601", bfd_arch_powerpc
,
1991 bfd_mach_ppc_601
, num_registers (registers_601
), registers_601
},
1992 {"602", "Motorola PowerPC 602", bfd_arch_powerpc
,
1993 bfd_mach_ppc_602
, num_registers (registers_602
), registers_602
},
1994 {"603", "Motorola/IBM PowerPC 603 or 603e", bfd_arch_powerpc
,
1995 bfd_mach_ppc_603
, num_registers (registers_603
), registers_603
},
1996 {"604", "Motorola PowerPC 604 or 604e", bfd_arch_powerpc
,
1997 604, num_registers (registers_604
), registers_604
},
1998 {"403GC", "IBM PowerPC 403GC", bfd_arch_powerpc
,
1999 bfd_mach_ppc_403gc
, num_registers (registers_403GC
), registers_403GC
},
2000 {"505", "Motorola PowerPC 505", bfd_arch_powerpc
,
2001 bfd_mach_ppc_505
, num_registers (registers_505
), registers_505
},
2002 {"860", "Motorola PowerPC 860 or 850", bfd_arch_powerpc
,
2003 bfd_mach_ppc_860
, num_registers (registers_860
), registers_860
},
2004 {"750", "Motorola/IBM PowerPC 750 or 740", bfd_arch_powerpc
,
2005 bfd_mach_ppc_750
, num_registers (registers_750
), registers_750
},
2007 /* FIXME: I haven't checked the register sets of the following. */
2008 {"620", "Motorola PowerPC 620", bfd_arch_powerpc
,
2009 bfd_mach_ppc_620
, num_registers (registers_powerpc
), registers_powerpc
},
2010 {"a35", "PowerPC A35", bfd_arch_powerpc
,
2011 bfd_mach_ppc_a35
, num_registers (registers_powerpc
), registers_powerpc
},
2012 {"rs1", "IBM POWER RS1", bfd_arch_rs6000
,
2013 bfd_mach_rs6k_rs1
, num_registers (registers_power
), registers_power
},
2014 {"rsc", "IBM POWER RSC", bfd_arch_rs6000
,
2015 bfd_mach_rs6k_rsc
, num_registers (registers_power
), registers_power
},
2016 {"rs2", "IBM POWER RS2", bfd_arch_rs6000
,
2017 bfd_mach_rs6k_rs2
, num_registers (registers_power
), registers_power
},
2022 #undef num_registers
2024 /* Look up the variant named NAME in the `variants' table. Return a
2025 pointer to the struct variant, or null if we couldn't find it. */
2027 static const struct variant
*
2028 find_variant_by_name (char *name
)
2030 const struct variant
*v
;
2032 for (v
= variants
; v
->name
; v
++)
2033 if (!strcmp (name
, v
->name
))
2039 /* Return the variant corresponding to architecture ARCH and machine number
2040 MACH. If no such variant exists, return null. */
2042 static const struct variant
*
2043 find_variant_by_arch (enum bfd_architecture arch
, unsigned long mach
)
2045 const struct variant
*v
;
2047 for (v
= variants
; v
->name
; v
++)
2048 if (arch
== v
->arch
&& mach
== v
->mach
)
2058 process_note_abi_tag_sections (bfd
*abfd
, asection
*sect
, void *obj
)
2060 int *os_ident_ptr
= obj
;
2062 unsigned int sectsize
;
2064 name
= bfd_get_section_name (abfd
, sect
);
2065 sectsize
= bfd_section_size (abfd
, sect
);
2066 if (strcmp (name
, ".note.ABI-tag") == 0 && sectsize
> 0)
2068 unsigned int name_length
, data_length
, note_type
;
2069 char *note
= alloca (sectsize
);
2071 bfd_get_section_contents (abfd
, sect
, note
,
2072 (file_ptr
) 0, (bfd_size_type
) sectsize
);
2074 name_length
= bfd_h_get_32 (abfd
, note
);
2075 data_length
= bfd_h_get_32 (abfd
, note
+ 4);
2076 note_type
= bfd_h_get_32 (abfd
, note
+ 8);
2078 if (name_length
== 4 && data_length
== 16 && note_type
== 1
2079 && strcmp (note
+ 12, "GNU") == 0)
2081 int os_number
= bfd_h_get_32 (abfd
, note
+ 16);
2083 /* The case numbers are from abi-tags in glibc */
2087 *os_ident_ptr
= ELFOSABI_LINUX
;
2090 *os_ident_ptr
= ELFOSABI_HURD
;
2093 *os_ident_ptr
= ELFOSABI_SOLARIS
;
2096 internal_error (__FILE__
, __LINE__
,
2097 "process_note_abi_sections: unknown OS number %d",
2105 /* Return one of the ELFOSABI_ constants for BFDs representing ELF
2106 executables. If it's not an ELF executable or if the OS/ABI couldn't
2107 be determined, simply return -1. */
2110 get_elfosabi (bfd
*abfd
)
2114 if (abfd
!= NULL
&& bfd_get_flavour (abfd
) == bfd_target_elf_flavour
)
2116 elfosabi
= elf_elfheader (abfd
)->e_ident
[EI_OSABI
];
2118 /* When elfosabi is 0 (ELFOSABI_NONE), this is supposed to indicate
2119 that we're on a SYSV system. However, GNU/Linux uses a note section
2120 to record OS/ABI info, but leaves e_ident[EI_OSABI] zero. So we
2121 have to check the note sections too. */
2124 bfd_map_over_sections (abfd
,
2125 process_note_abi_tag_sections
,
2135 /* Initialize the current architecture based on INFO. If possible, re-use an
2136 architecture from ARCHES, which is a list of architectures already created
2137 during this debugging session.
2139 Called e.g. at program startup, when reading a core file, and when reading
2142 static struct gdbarch
*
2143 rs6000_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
2145 struct gdbarch
*gdbarch
;
2146 struct gdbarch_tdep
*tdep
;
2147 int wordsize
, from_xcoff_exec
, from_elf_exec
, power
, i
, off
;
2149 const struct variant
*v
;
2150 enum bfd_architecture arch
;
2153 int osabi
, sysv_abi
;
2155 from_xcoff_exec
= info
.abfd
&& info
.abfd
->format
== bfd_object
&&
2156 bfd_get_flavour (info
.abfd
) == bfd_target_xcoff_flavour
;
2158 from_elf_exec
= info
.abfd
&& info
.abfd
->format
== bfd_object
&&
2159 bfd_get_flavour (info
.abfd
) == bfd_target_elf_flavour
;
2161 sysv_abi
= info
.abfd
&& bfd_get_flavour (info
.abfd
) == bfd_target_elf_flavour
;
2163 osabi
= get_elfosabi (info
.abfd
);
2165 /* Check word size. If INFO is from a binary file, infer it from that,
2166 else use the previously-inferred size. */
2167 if (from_xcoff_exec
)
2169 if (xcoff_data (info
.abfd
)->xcoff64
)
2174 else if (from_elf_exec
)
2176 if (elf_elfheader (info
.abfd
)->e_ident
[EI_CLASS
] == ELFCLASS64
)
2185 wordsize
= tdep
->wordsize
;
2190 /* Find a candidate among extant architectures. */
2191 for (arches
= gdbarch_list_lookup_by_info (arches
, &info
);
2193 arches
= gdbarch_list_lookup_by_info (arches
->next
, &info
))
2195 /* Word size in the various PowerPC bfd_arch_info structs isn't
2196 meaningful, because 64-bit CPUs can run in 32-bit mode. So, perform
2197 separate word size check. */
2198 tdep
= gdbarch_tdep (arches
->gdbarch
);
2199 if (tdep
&& tdep
->wordsize
== wordsize
&& tdep
->osabi
== osabi
)
2200 return arches
->gdbarch
;
2203 /* None found, create a new architecture from INFO, whose bfd_arch_info
2204 validity depends on the source:
2205 - executable useless
2206 - rs6000_host_arch() good
2208 - "set arch" trust blindly
2209 - GDB startup useless but harmless */
2211 if (!from_xcoff_exec
)
2213 arch
= info
.bfd_arch_info
->arch
;
2214 mach
= info
.bfd_arch_info
->mach
;
2218 arch
= bfd_arch_powerpc
;
2220 bfd_default_set_arch_mach (&abfd
, arch
, mach
);
2221 info
.bfd_arch_info
= bfd_get_arch_info (&abfd
);
2223 tdep
= xmalloc (sizeof (struct gdbarch_tdep
));
2224 tdep
->wordsize
= wordsize
;
2225 tdep
->osabi
= osabi
;
2226 gdbarch
= gdbarch_alloc (&info
, tdep
);
2227 power
= arch
== bfd_arch_rs6000
;
2229 /* Select instruction printer. */
2230 tm_print_insn
= arch
== power
? print_insn_rs6000
:
2231 info
.byte_order
== BIG_ENDIAN
? print_insn_big_powerpc
:
2232 print_insn_little_powerpc
;
2234 /* Choose variant. */
2235 v
= find_variant_by_arch (arch
, mach
);
2237 v
= find_variant_by_name (power
? "power" : "powerpc");
2238 tdep
->regs
= v
->regs
;
2240 /* Calculate byte offsets in raw register array. */
2241 tdep
->regoff
= xmalloc (v
->nregs
* sizeof (int));
2242 for (i
= off
= 0; i
< v
->nregs
; i
++)
2244 tdep
->regoff
[i
] = off
;
2245 off
+= regsize (v
->regs
+ i
, wordsize
);
2248 set_gdbarch_read_pc (gdbarch
, generic_target_read_pc
);
2249 set_gdbarch_write_pc (gdbarch
, generic_target_write_pc
);
2250 set_gdbarch_read_fp (gdbarch
, generic_target_read_fp
);
2251 set_gdbarch_write_fp (gdbarch
, generic_target_write_fp
);
2252 set_gdbarch_read_sp (gdbarch
, generic_target_read_sp
);
2253 set_gdbarch_write_sp (gdbarch
, generic_target_write_sp
);
2255 set_gdbarch_num_regs (gdbarch
, v
->nregs
);
2256 set_gdbarch_sp_regnum (gdbarch
, 1);
2257 set_gdbarch_fp_regnum (gdbarch
, 1);
2258 set_gdbarch_pc_regnum (gdbarch
, 64);
2259 set_gdbarch_register_name (gdbarch
, rs6000_register_name
);
2260 set_gdbarch_register_size (gdbarch
, wordsize
);
2261 set_gdbarch_register_bytes (gdbarch
, off
);
2262 set_gdbarch_register_byte (gdbarch
, rs6000_register_byte
);
2263 set_gdbarch_register_raw_size (gdbarch
, rs6000_register_raw_size
);
2264 set_gdbarch_max_register_raw_size (gdbarch
, 8);
2265 set_gdbarch_register_virtual_size (gdbarch
, rs6000_register_virtual_size
);
2266 set_gdbarch_max_register_virtual_size (gdbarch
, 8);
2267 set_gdbarch_register_virtual_type (gdbarch
, rs6000_register_virtual_type
);
2269 set_gdbarch_ptr_bit (gdbarch
, wordsize
* TARGET_CHAR_BIT
);
2270 set_gdbarch_short_bit (gdbarch
, 2 * TARGET_CHAR_BIT
);
2271 set_gdbarch_int_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
2272 set_gdbarch_long_bit (gdbarch
, wordsize
* TARGET_CHAR_BIT
);
2273 set_gdbarch_long_long_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2274 set_gdbarch_float_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
2275 set_gdbarch_double_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2276 set_gdbarch_long_double_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2278 set_gdbarch_use_generic_dummy_frames (gdbarch
, 1);
2279 set_gdbarch_call_dummy_length (gdbarch
, 0);
2280 set_gdbarch_call_dummy_location (gdbarch
, AT_ENTRY_POINT
);
2281 set_gdbarch_call_dummy_address (gdbarch
, entry_point_address
);
2282 set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch
, 1);
2283 set_gdbarch_call_dummy_breakpoint_offset (gdbarch
, 0);
2284 set_gdbarch_call_dummy_start_offset (gdbarch
, 0);
2285 set_gdbarch_pc_in_call_dummy (gdbarch
, generic_pc_in_call_dummy
);
2286 set_gdbarch_call_dummy_p (gdbarch
, 1);
2287 set_gdbarch_call_dummy_stack_adjust_p (gdbarch
, 0);
2288 set_gdbarch_get_saved_register (gdbarch
, generic_get_saved_register
);
2289 set_gdbarch_fix_call_dummy (gdbarch
, rs6000_fix_call_dummy
);
2290 set_gdbarch_push_dummy_frame (gdbarch
, generic_push_dummy_frame
);
2291 set_gdbarch_save_dummy_frame_tos (gdbarch
, generic_save_dummy_frame_tos
);
2292 set_gdbarch_push_return_address (gdbarch
, ppc_push_return_address
);
2293 set_gdbarch_believe_pcc_promotion (gdbarch
, 1);
2294 set_gdbarch_coerce_float_to_double (gdbarch
, rs6000_coerce_float_to_double
);
2296 set_gdbarch_register_convertible (gdbarch
, rs6000_register_convertible
);
2297 set_gdbarch_register_convert_to_virtual (gdbarch
, rs6000_register_convert_to_virtual
);
2298 set_gdbarch_register_convert_to_raw (gdbarch
, rs6000_register_convert_to_raw
);
2300 set_gdbarch_extract_return_value (gdbarch
, rs6000_extract_return_value
);
2303 set_gdbarch_push_arguments (gdbarch
, ppc_sysv_abi_push_arguments
);
2305 set_gdbarch_push_arguments (gdbarch
, rs6000_push_arguments
);
2307 set_gdbarch_store_struct_return (gdbarch
, rs6000_store_struct_return
);
2308 set_gdbarch_store_return_value (gdbarch
, rs6000_store_return_value
);
2309 set_gdbarch_extract_struct_value_address (gdbarch
, rs6000_extract_struct_value_address
);
2310 set_gdbarch_use_struct_convention (gdbarch
, generic_use_struct_convention
);
2312 set_gdbarch_pop_frame (gdbarch
, rs6000_pop_frame
);
2314 set_gdbarch_skip_prologue (gdbarch
, rs6000_skip_prologue
);
2315 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
2316 set_gdbarch_decr_pc_after_break (gdbarch
, 0);
2317 set_gdbarch_function_start_offset (gdbarch
, 0);
2318 set_gdbarch_breakpoint_from_pc (gdbarch
, rs6000_breakpoint_from_pc
);
2320 /* Not sure on this. FIXMEmgo */
2321 set_gdbarch_frame_args_skip (gdbarch
, 8);
2323 set_gdbarch_frame_chain_valid (gdbarch
, file_frame_chain_valid
);
2324 if (osabi
== ELFOSABI_LINUX
)
2326 set_gdbarch_frameless_function_invocation (gdbarch
,
2327 ppc_linux_frameless_function_invocation
);
2328 set_gdbarch_frame_chain (gdbarch
, ppc_linux_frame_chain
);
2329 set_gdbarch_frame_saved_pc (gdbarch
, ppc_linux_frame_saved_pc
);
2331 set_gdbarch_frame_init_saved_regs (gdbarch
,
2332 ppc_linux_frame_init_saved_regs
);
2333 set_gdbarch_init_extra_frame_info (gdbarch
,
2334 ppc_linux_init_extra_frame_info
);
2336 set_gdbarch_memory_remove_breakpoint (gdbarch
,
2337 ppc_linux_memory_remove_breakpoint
);
2341 set_gdbarch_frameless_function_invocation (gdbarch
,
2342 rs6000_frameless_function_invocation
);
2343 set_gdbarch_frame_chain (gdbarch
, rs6000_frame_chain
);
2344 set_gdbarch_frame_saved_pc (gdbarch
, rs6000_frame_saved_pc
);
2346 set_gdbarch_frame_init_saved_regs (gdbarch
, rs6000_frame_init_saved_regs
);
2347 set_gdbarch_init_extra_frame_info (gdbarch
, rs6000_init_extra_frame_info
);
2349 /* Handle RS/6000 function pointers. */
2350 set_gdbarch_convert_from_func_ptr_addr (gdbarch
,
2351 rs6000_convert_from_func_ptr_addr
);
2353 set_gdbarch_frame_args_address (gdbarch
, rs6000_frame_args_address
);
2354 set_gdbarch_frame_locals_address (gdbarch
, rs6000_frame_args_address
);
2355 set_gdbarch_saved_pc_after_call (gdbarch
, rs6000_saved_pc_after_call
);
2357 /* We can't tell how many args there are
2358 now that the C compiler delays popping them. */
2359 set_gdbarch_frame_num_args (gdbarch
, frame_num_args_unknown
);
2364 /* Initialization code. */
2367 _initialize_rs6000_tdep (void)
2369 register_gdbarch_init (bfd_arch_rs6000
, rs6000_gdbarch_init
);
2370 register_gdbarch_init (bfd_arch_powerpc
, rs6000_gdbarch_init
);