1 /* Target-dependent code for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002
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"
36 #include "parser-defs.h"
38 #include "bfd/libbfd.h" /* for bfd_default_set_arch_mach */
39 #include "coff/internal.h" /* for libcoff.h */
40 #include "bfd/libcoff.h" /* for xcoff_data */
44 #include "solib-svr4.h"
47 /* If the kernel has to deliver a signal, it pushes a sigcontext
48 structure on the stack and then calls the signal handler, passing
49 the address of the sigcontext in an argument register. Usually
50 the signal handler doesn't save this register, so we have to
51 access the sigcontext structure via an offset from the signal handler
53 The following constants were determined by experimentation on AIX 3.2. */
54 #define SIG_FRAME_PC_OFFSET 96
55 #define SIG_FRAME_LR_OFFSET 108
56 #define SIG_FRAME_FP_OFFSET 284
58 /* To be used by skip_prologue. */
60 struct rs6000_framedata
62 int offset
; /* total size of frame --- the distance
63 by which we decrement sp to allocate
65 int saved_gpr
; /* smallest # of saved gpr */
66 int saved_fpr
; /* smallest # of saved fpr */
67 int saved_vr
; /* smallest # of saved vr */
68 int alloca_reg
; /* alloca register number (frame ptr) */
69 char frameless
; /* true if frameless functions. */
70 char nosavedpc
; /* true if pc not saved. */
71 int gpr_offset
; /* offset of saved gprs from prev sp */
72 int fpr_offset
; /* offset of saved fprs from prev sp */
73 int vr_offset
; /* offset of saved vrs from prev sp */
74 int lr_offset
; /* offset of saved lr */
75 int cr_offset
; /* offset of saved cr */
76 int vrsave_offset
; /* offset of saved vrsave register */
79 /* Description of a single register. */
83 char *name
; /* name of register */
84 unsigned char sz32
; /* size on 32-bit arch, 0 if nonextant */
85 unsigned char sz64
; /* size on 64-bit arch, 0 if nonextant */
86 unsigned char fpr
; /* whether register is floating-point */
89 /* Return the current architecture's gdbarch_tdep structure. */
91 #define TDEP gdbarch_tdep (current_gdbarch)
93 /* Breakpoint shadows for the single step instructions will be kept here. */
95 static struct sstep_breaks
97 /* Address, or 0 if this is not in use. */
99 /* Shadow contents. */
104 /* Hook for determining the TOC address when calling functions in the
105 inferior under AIX. The initialization code in rs6000-nat.c sets
106 this hook to point to find_toc_address. */
108 CORE_ADDR (*rs6000_find_toc_address_hook
) (CORE_ADDR
) = NULL
;
110 /* Hook to set the current architecture when starting a child process.
111 rs6000-nat.c sets this. */
113 void (*rs6000_set_host_arch_hook
) (int) = NULL
;
115 /* Static function prototypes */
117 static CORE_ADDR
branch_dest (int opcode
, int instr
, CORE_ADDR pc
,
119 static CORE_ADDR
skip_prologue (CORE_ADDR
, CORE_ADDR
,
120 struct rs6000_framedata
*);
121 static void frame_get_saved_regs (struct frame_info
* fi
,
122 struct rs6000_framedata
* fdatap
);
123 static CORE_ADDR
frame_initial_stack_address (struct frame_info
*);
125 /* Read a LEN-byte address from debugged memory address MEMADDR. */
128 read_memory_addr (CORE_ADDR memaddr
, int len
)
130 return read_memory_unsigned_integer (memaddr
, len
);
134 rs6000_skip_prologue (CORE_ADDR pc
)
136 struct rs6000_framedata frame
;
137 pc
= skip_prologue (pc
, 0, &frame
);
142 /* Fill in fi->saved_regs */
144 struct frame_extra_info
146 /* Functions calling alloca() change the value of the stack
147 pointer. We need to use initial stack pointer (which is saved in
148 r31 by gcc) in such cases. If a compiler emits traceback table,
149 then we should use the alloca register specified in traceback
151 CORE_ADDR initial_sp
; /* initial stack pointer. */
155 rs6000_init_extra_frame_info (int fromleaf
, struct frame_info
*fi
)
157 fi
->extra_info
= (struct frame_extra_info
*)
158 frame_obstack_alloc (sizeof (struct frame_extra_info
));
159 fi
->extra_info
->initial_sp
= 0;
160 if (fi
->next
!= (CORE_ADDR
) 0
161 && fi
->pc
< TEXT_SEGMENT_BASE
)
162 /* We're in get_prev_frame */
163 /* and this is a special signal frame. */
164 /* (fi->pc will be some low address in the kernel, */
165 /* to which the signal handler returns). */
166 fi
->signal_handler_caller
= 1;
169 /* Put here the code to store, into a struct frame_saved_regs,
170 the addresses of the saved registers of frame described by FRAME_INFO.
171 This includes special registers such as pc and fp saved in special
172 ways in the stack frame. sp is even more special:
173 the address we return for it IS the sp for the next frame. */
175 /* In this implementation for RS/6000, we do *not* save sp. I am
176 not sure if it will be needed. The following function takes care of gpr's
180 rs6000_frame_init_saved_regs (struct frame_info
*fi
)
182 frame_get_saved_regs (fi
, NULL
);
186 rs6000_frame_args_address (struct frame_info
*fi
)
188 if (fi
->extra_info
->initial_sp
!= 0)
189 return fi
->extra_info
->initial_sp
;
191 return frame_initial_stack_address (fi
);
194 /* Immediately after a function call, return the saved pc.
195 Can't go through the frames for this because on some machines
196 the new frame is not set up until the new function executes
197 some instructions. */
200 rs6000_saved_pc_after_call (struct frame_info
*fi
)
202 return read_register (gdbarch_tdep (current_gdbarch
)->ppc_lr_regnum
);
205 /* Calculate the destination of a branch/jump. Return -1 if not a branch. */
208 branch_dest (int opcode
, int instr
, CORE_ADDR pc
, CORE_ADDR safety
)
215 absolute
= (int) ((instr
>> 1) & 1);
220 immediate
= ((instr
& ~3) << 6) >> 6; /* br unconditional */
224 dest
= pc
+ immediate
;
228 immediate
= ((instr
& ~3) << 16) >> 16; /* br conditional */
232 dest
= pc
+ immediate
;
236 ext_op
= (instr
>> 1) & 0x3ff;
238 if (ext_op
== 16) /* br conditional register */
240 dest
= read_register (gdbarch_tdep (current_gdbarch
)->ppc_lr_regnum
) & ~3;
242 /* If we are about to return from a signal handler, dest is
243 something like 0x3c90. The current frame is a signal handler
244 caller frame, upon completion of the sigreturn system call
245 execution will return to the saved PC in the frame. */
246 if (dest
< TEXT_SEGMENT_BASE
)
248 struct frame_info
*fi
;
250 fi
= get_current_frame ();
252 dest
= read_memory_addr (fi
->frame
+ SIG_FRAME_PC_OFFSET
,
257 else if (ext_op
== 528) /* br cond to count reg */
259 dest
= read_register (gdbarch_tdep (current_gdbarch
)->ppc_ctr_regnum
) & ~3;
261 /* If we are about to execute a system call, dest is something
262 like 0x22fc or 0x3b00. Upon completion the system call
263 will return to the address in the link register. */
264 if (dest
< TEXT_SEGMENT_BASE
)
265 dest
= read_register (gdbarch_tdep (current_gdbarch
)->ppc_lr_regnum
) & ~3;
274 return (dest
< TEXT_SEGMENT_BASE
) ? safety
: dest
;
278 /* Sequence of bytes for breakpoint instruction. */
280 #define BIG_BREAKPOINT { 0x7d, 0x82, 0x10, 0x08 }
281 #define LITTLE_BREAKPOINT { 0x08, 0x10, 0x82, 0x7d }
283 static unsigned char *
284 rs6000_breakpoint_from_pc (CORE_ADDR
*bp_addr
, int *bp_size
)
286 static unsigned char big_breakpoint
[] = BIG_BREAKPOINT
;
287 static unsigned char little_breakpoint
[] = LITTLE_BREAKPOINT
;
289 if (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
)
290 return big_breakpoint
;
292 return little_breakpoint
;
296 /* AIX does not support PT_STEP. Simulate it. */
299 rs6000_software_single_step (enum target_signal signal
,
300 int insert_breakpoints_p
)
302 #define INSNLEN(OPCODE) 4
304 static char le_breakp
[] = LITTLE_BREAKPOINT
;
305 static char be_breakp
[] = BIG_BREAKPOINT
;
306 char *breakp
= TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? be_breakp
: le_breakp
;
312 if (insert_breakpoints_p
)
317 insn
= read_memory_integer (loc
, 4);
319 breaks
[0] = loc
+ INSNLEN (insn
);
321 breaks
[1] = branch_dest (opcode
, insn
, loc
, breaks
[0]);
323 /* Don't put two breakpoints on the same address. */
324 if (breaks
[1] == breaks
[0])
327 stepBreaks
[1].address
= 0;
329 for (ii
= 0; ii
< 2; ++ii
)
332 /* ignore invalid breakpoint. */
333 if (breaks
[ii
] == -1)
336 read_memory (breaks
[ii
], stepBreaks
[ii
].data
, 4);
338 write_memory (breaks
[ii
], breakp
, 4);
339 stepBreaks
[ii
].address
= breaks
[ii
];
346 /* remove step breakpoints. */
347 for (ii
= 0; ii
< 2; ++ii
)
348 if (stepBreaks
[ii
].address
!= 0)
350 (stepBreaks
[ii
].address
, stepBreaks
[ii
].data
, 4);
353 errno
= 0; /* FIXME, don't ignore errors! */
354 /* What errors? {read,write}_memory call error(). */
358 /* return pc value after skipping a function prologue and also return
359 information about a function frame.
361 in struct rs6000_framedata fdata:
362 - frameless is TRUE, if function does not have a frame.
363 - nosavedpc is TRUE, if function does not save %pc value in its frame.
364 - offset is the initial size of this stack frame --- the amount by
365 which we decrement the sp to allocate the frame.
366 - saved_gpr is the number of the first saved gpr.
367 - saved_fpr is the number of the first saved fpr.
368 - saved_vr is the number of the first saved vr.
369 - alloca_reg is the number of the register used for alloca() handling.
371 - gpr_offset is the offset of the first saved gpr from the previous frame.
372 - fpr_offset is the offset of the first saved fpr from the previous frame.
373 - vr_offset is the offset of the first saved vr from the previous frame.
374 - lr_offset is the offset of the saved lr
375 - cr_offset is the offset of the saved cr
376 - vrsave_offset is the offset of the saved vrsave register
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
;
443 CORE_ADDR li_found_pc
= 0;
447 long vr_saved_offset
= 0;
454 int minimal_toc_loaded
= 0;
455 int prev_insn_was_prologue_insn
= 1;
456 int num_skip_non_prologue_insns
= 0;
458 /* Attempt to find the end of the prologue when no limit is specified.
459 Note that refine_prologue_limit() has been written so that it may
460 be used to "refine" the limits of non-zero PC values too, but this
461 is only safe if we 1) trust the line information provided by the
462 compiler and 2) iterate enough to actually find the end of the
465 It may become a good idea at some point (for both performance and
466 accuracy) to unconditionally call refine_prologue_limit(). But,
467 until we can make a clear determination that this is beneficial,
468 we'll play it safe and only use it to obtain a limit when none
469 has been specified. */
471 lim_pc
= refine_prologue_limit (pc
, lim_pc
);
473 memset (fdata
, 0, sizeof (struct rs6000_framedata
));
474 fdata
->saved_gpr
= -1;
475 fdata
->saved_fpr
= -1;
476 fdata
->saved_vr
= -1;
477 fdata
->alloca_reg
= -1;
478 fdata
->frameless
= 1;
479 fdata
->nosavedpc
= 1;
483 /* Sometimes it isn't clear if an instruction is a prologue
484 instruction or not. When we encounter one of these ambiguous
485 cases, we'll set prev_insn_was_prologue_insn to 0 (false).
486 Otherwise, we'll assume that it really is a prologue instruction. */
487 if (prev_insn_was_prologue_insn
)
488 last_prologue_pc
= pc
;
490 /* Stop scanning if we've hit the limit. */
491 if (lim_pc
!= 0 && pc
>= lim_pc
)
494 prev_insn_was_prologue_insn
= 1;
496 /* Fetch the instruction and convert it to an integer. */
497 if (target_read_memory (pc
, buf
, 4))
499 op
= extract_signed_integer (buf
, 4);
501 if ((op
& 0xfc1fffff) == 0x7c0802a6)
503 lr_reg
= (op
& 0x03e00000) | 0x90010000;
507 else if ((op
& 0xfc1fffff) == 0x7c000026)
509 cr_reg
= (op
& 0x03e00000) | 0x90010000;
513 else if ((op
& 0xfc1f0000) == 0xd8010000)
514 { /* stfd Rx,NUM(r1) */
515 reg
= GET_SRC_REG (op
);
516 if (fdata
->saved_fpr
== -1 || fdata
->saved_fpr
> reg
)
518 fdata
->saved_fpr
= reg
;
519 fdata
->fpr_offset
= SIGNED_SHORT (op
) + offset
;
524 else if (((op
& 0xfc1f0000) == 0xbc010000) || /* stm Rx, NUM(r1) */
525 (((op
& 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
526 (op
& 0xfc1f0003) == 0xf8010000) && /* std rx,NUM(r1) */
527 (op
& 0x03e00000) >= 0x01a00000)) /* rx >= r13 */
530 reg
= GET_SRC_REG (op
);
531 if (fdata
->saved_gpr
== -1 || fdata
->saved_gpr
> reg
)
533 fdata
->saved_gpr
= reg
;
534 if ((op
& 0xfc1f0003) == 0xf8010000)
536 fdata
->gpr_offset
= SIGNED_SHORT (op
) + offset
;
541 else if ((op
& 0xffff0000) == 0x60000000)
544 /* Allow nops in the prologue, but do not consider them to
545 be part of the prologue unless followed by other prologue
547 prev_insn_was_prologue_insn
= 0;
551 else if ((op
& 0xffff0000) == 0x3c000000)
552 { /* addis 0,0,NUM, used
554 fdata
->offset
= (op
& 0x0000ffff) << 16;
555 fdata
->frameless
= 0;
559 else if ((op
& 0xffff0000) == 0x60000000)
560 { /* ori 0,0,NUM, 2nd ha
561 lf of >= 32k frames */
562 fdata
->offset
|= (op
& 0x0000ffff);
563 fdata
->frameless
= 0;
567 else if (lr_reg
!= -1 && (op
& 0xffff0000) == lr_reg
)
570 fdata
->lr_offset
= SIGNED_SHORT (op
) + offset
;
571 fdata
->nosavedpc
= 0;
576 else if (cr_reg
!= -1 && (op
& 0xffff0000) == cr_reg
)
579 fdata
->cr_offset
= SIGNED_SHORT (op
) + offset
;
584 else if (op
== 0x48000005)
590 else if (op
== 0x48000004)
595 else if (((op
& 0xffff0000) == 0x801e0000 || /* lwz 0,NUM(r30), used
596 in V.4 -mrelocatable */
597 op
== 0x7fc0f214) && /* add r30,r0,r30, used
598 in V.4 -mrelocatable */
599 lr_reg
== 0x901e0000)
604 else if ((op
& 0xffff0000) == 0x3fc00000 || /* addis 30,0,foo@ha, used
605 in V.4 -mminimal-toc */
606 (op
& 0xffff0000) == 0x3bde0000)
607 { /* addi 30,30,foo@l */
611 else if ((op
& 0xfc000001) == 0x48000001)
615 fdata
->frameless
= 0;
616 /* Don't skip over the subroutine call if it is not within
617 the first three instructions of the prologue. */
618 if ((pc
- orig_pc
) > 8)
621 op
= read_memory_integer (pc
+ 4, 4);
623 /* At this point, make sure this is not a trampoline
624 function (a function that simply calls another functions,
625 and nothing else). If the next is not a nop, this branch
626 was part of the function prologue. */
628 if (op
== 0x4def7b82 || op
== 0) /* crorc 15, 15, 15 */
629 break; /* don't skip over
633 /* update stack pointer */
635 else if ((op
& 0xffff0000) == 0x94210000 || /* stu r1,NUM(r1) */
636 (op
& 0xffff0003) == 0xf8210001) /* stdu r1,NUM(r1) */
638 fdata
->frameless
= 0;
639 if ((op
& 0xffff0003) == 0xf8210001)
641 fdata
->offset
= SIGNED_SHORT (op
);
642 offset
= fdata
->offset
;
646 else if (op
== 0x7c21016e)
648 fdata
->frameless
= 0;
649 offset
= fdata
->offset
;
652 /* Load up minimal toc pointer */
654 else if ((op
>> 22) == 0x20f
655 && !minimal_toc_loaded
)
656 { /* l r31,... or l r30,... */
657 minimal_toc_loaded
= 1;
660 /* move parameters from argument registers to local variable
663 else if ((op
& 0xfc0007fe) == 0x7c000378 && /* mr(.) Rx,Ry */
664 (((op
>> 21) & 31) >= 3) && /* R3 >= Ry >= R10 */
665 (((op
>> 21) & 31) <= 10) &&
666 (((op
>> 16) & 31) >= fdata
->saved_gpr
)) /* Rx: local var reg */
670 /* store parameters in stack */
672 else if ((op
& 0xfc1f0003) == 0xf8010000 || /* std rx,NUM(r1) */
673 (op
& 0xfc1f0000) == 0xd8010000 || /* stfd Rx,NUM(r1) */
674 (op
& 0xfc1f0000) == 0xfc010000) /* frsp, fp?,NUM(r1) */
678 /* store parameters in stack via frame pointer */
681 ((op
& 0xfc1f0000) == 0x901f0000 || /* st rx,NUM(r1) */
682 (op
& 0xfc1f0000) == 0xd81f0000 || /* stfd Rx,NUM(r1) */
683 (op
& 0xfc1f0000) == 0xfc1f0000))
684 { /* frsp, fp?,NUM(r1) */
687 /* Set up frame pointer */
689 else if (op
== 0x603f0000 /* oril r31, r1, 0x0 */
692 fdata
->frameless
= 0;
694 fdata
->alloca_reg
= 31;
697 /* Another way to set up the frame pointer. */
699 else if ((op
& 0xfc1fffff) == 0x38010000)
700 { /* addi rX, r1, 0x0 */
701 fdata
->frameless
= 0;
703 fdata
->alloca_reg
= (op
& ~0x38010000) >> 21;
706 /* AltiVec related instructions. */
707 /* Store the vrsave register (spr 256) in another register for
708 later manipulation, or load a register into the vrsave
709 register. 2 instructions are used: mfvrsave and
710 mtvrsave. They are shorthand notation for mfspr Rn, SPR256
711 and mtspr SPR256, Rn. */
712 /* mfspr Rn SPR256 == 011111 nnnnn 0000001000 01010100110
713 mtspr SPR256 Rn == 011111 nnnnn 0000001000 01110100110 */
714 else if ((op
& 0xfc1fffff) == 0x7c0042a6) /* mfvrsave Rn */
716 vrsave_reg
= GET_SRC_REG (op
);
719 else if ((op
& 0xfc1fffff) == 0x7c0043a6) /* mtvrsave Rn */
723 /* Store the register where vrsave was saved to onto the stack:
724 rS is the register where vrsave was stored in a previous
726 /* 100100 sssss 00001 dddddddd dddddddd */
727 else if ((op
& 0xfc1f0000) == 0x90010000) /* stw rS, d(r1) */
729 if (vrsave_reg
== GET_SRC_REG (op
))
731 fdata
->vrsave_offset
= SIGNED_SHORT (op
) + offset
;
736 /* Compute the new value of vrsave, by modifying the register
737 where vrsave was saved to. */
738 else if (((op
& 0xfc000000) == 0x64000000) /* oris Ra, Rs, UIMM */
739 || ((op
& 0xfc000000) == 0x60000000))/* ori Ra, Rs, UIMM */
743 /* li r0, SIMM (short for addi r0, 0, SIMM). This is the first
744 in a pair of insns to save the vector registers on the
746 /* 001110 00000 00000 iiii iiii iiii iiii */
747 else if ((op
& 0xffff0000) == 0x38000000) /* li r0, SIMM */
750 vr_saved_offset
= SIGNED_SHORT (op
);
752 /* Store vector register S at (r31+r0) aligned to 16 bytes. */
753 /* 011111 sssss 11111 00000 00111001110 */
754 else if ((op
& 0xfc1fffff) == 0x7c1f01ce) /* stvx Vs, R31, R0 */
756 if (pc
== (li_found_pc
+ 4))
758 vr_reg
= GET_SRC_REG (op
);
759 /* If this is the first vector reg to be saved, or if
760 it has a lower number than others previously seen,
761 reupdate the frame info. */
762 if (fdata
->saved_vr
== -1 || fdata
->saved_vr
> vr_reg
)
764 fdata
->saved_vr
= vr_reg
;
765 fdata
->vr_offset
= vr_saved_offset
+ offset
;
767 vr_saved_offset
= -1;
772 /* End AltiVec related instructions. */
775 /* Not a recognized prologue instruction.
776 Handle optimizer code motions into the prologue by continuing
777 the search if we have no valid frame yet or if the return
778 address is not yet saved in the frame. */
779 if (fdata
->frameless
== 0
780 && (lr_reg
== -1 || fdata
->nosavedpc
== 0))
783 if (op
== 0x4e800020 /* blr */
784 || op
== 0x4e800420) /* bctr */
785 /* Do not scan past epilogue in frameless functions or
788 if ((op
& 0xf4000000) == 0x40000000) /* bxx */
789 /* Never skip branches. */
792 if (num_skip_non_prologue_insns
++ > max_skip_non_prologue_insns
)
793 /* Do not scan too many insns, scanning insns is expensive with
797 /* Continue scanning. */
798 prev_insn_was_prologue_insn
= 0;
804 /* I have problems with skipping over __main() that I need to address
805 * sometime. Previously, I used to use misc_function_vector which
806 * didn't work as well as I wanted to be. -MGO */
808 /* If the first thing after skipping a prolog is a branch to a function,
809 this might be a call to an initializer in main(), introduced by gcc2.
810 We'd like to skip over it as well. Fortunately, xlc does some extra
811 work before calling a function right after a prologue, thus we can
812 single out such gcc2 behaviour. */
815 if ((op
& 0xfc000001) == 0x48000001)
816 { /* bl foo, an initializer function? */
817 op
= read_memory_integer (pc
+ 4, 4);
819 if (op
== 0x4def7b82)
820 { /* cror 0xf, 0xf, 0xf (nop) */
822 /* check and see if we are in main. If so, skip over this initializer
825 tmp
= find_pc_misc_function (pc
);
826 if (tmp
>= 0 && STREQ (misc_function_vector
[tmp
].name
, main_name ()))
832 fdata
->offset
= -fdata
->offset
;
833 return last_prologue_pc
;
837 /*************************************************************************
838 Support for creating pushing a dummy frame into the stack, and popping
840 *************************************************************************/
843 /* Pop the innermost frame, go back to the caller. */
846 rs6000_pop_frame (void)
848 CORE_ADDR pc
, lr
, sp
, prev_sp
, addr
; /* %pc, %lr, %sp */
849 struct rs6000_framedata fdata
;
850 struct frame_info
*frame
= get_current_frame ();
854 sp
= FRAME_FP (frame
);
856 if (PC_IN_CALL_DUMMY (frame
->pc
, frame
->frame
, frame
->frame
))
858 generic_pop_dummy_frame ();
859 flush_cached_frames ();
863 /* Make sure that all registers are valid. */
864 read_register_bytes (0, NULL
, REGISTER_BYTES
);
866 /* figure out previous %pc value. If the function is frameless, it is
867 still in the link register, otherwise walk the frames and retrieve the
868 saved %pc value in the previous frame. */
870 addr
= get_pc_function_start (frame
->pc
);
871 (void) skip_prologue (addr
, frame
->pc
, &fdata
);
873 wordsize
= TDEP
->wordsize
;
877 prev_sp
= read_memory_addr (sp
, wordsize
);
878 if (fdata
.lr_offset
== 0)
879 lr
= read_register (gdbarch_tdep (current_gdbarch
)->ppc_lr_regnum
);
881 lr
= read_memory_addr (prev_sp
+ fdata
.lr_offset
, wordsize
);
883 /* reset %pc value. */
884 write_register (PC_REGNUM
, lr
);
886 /* reset register values if any was saved earlier. */
888 if (fdata
.saved_gpr
!= -1)
890 addr
= prev_sp
+ fdata
.gpr_offset
;
891 for (ii
= fdata
.saved_gpr
; ii
<= 31; ++ii
)
893 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
)], wordsize
);
898 if (fdata
.saved_fpr
!= -1)
900 addr
= prev_sp
+ fdata
.fpr_offset
;
901 for (ii
= fdata
.saved_fpr
; ii
<= 31; ++ii
)
903 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
+ FP0_REGNUM
)], 8);
908 write_register (SP_REGNUM
, prev_sp
);
909 target_store_registers (-1);
910 flush_cached_frames ();
913 /* Fixup the call sequence of a dummy function, with the real function
914 address. Its arguments will be passed by gdb. */
917 rs6000_fix_call_dummy (char *dummyname
, CORE_ADDR pc
, CORE_ADDR fun
,
918 int nargs
, struct value
**args
, struct type
*type
,
921 #define TOC_ADDR_OFFSET 20
922 #define TARGET_ADDR_OFFSET 28
925 CORE_ADDR target_addr
;
927 if (rs6000_find_toc_address_hook
!= NULL
)
929 CORE_ADDR tocvalue
= (*rs6000_find_toc_address_hook
) (fun
);
930 write_register (gdbarch_tdep (current_gdbarch
)->ppc_toc_regnum
,
935 /* Pass the arguments in either registers, or in the stack. In RS/6000,
936 the first eight words of the argument list (that might be less than
937 eight parameters if some parameters occupy more than one word) are
938 passed in r3..r10 registers. float and double parameters are
939 passed in fpr's, in addition to that. Rest of the parameters if any
940 are passed in user stack. There might be cases in which half of the
941 parameter is copied into registers, the other half is pushed into
944 Stack must be aligned on 64-bit boundaries when synthesizing
947 If the function is returning a structure, then the return address is passed
948 in r3, then the first 7 words of the parameters can be passed in registers,
952 rs6000_push_arguments (int nargs
, struct value
**args
, CORE_ADDR sp
,
953 int struct_return
, CORE_ADDR struct_addr
)
957 int argno
; /* current argument number */
958 int argbytes
; /* current argument byte */
960 int f_argno
= 0; /* current floating point argno */
961 int wordsize
= TDEP
->wordsize
;
963 struct value
*arg
= 0;
968 /* The first eight words of ther arguments are passed in registers. Copy
971 If the function is returning a `struct', then the first word (which
972 will be passed in r3) is used for struct return address. In that
973 case we should advance one word and start from r4 register to copy
976 ii
= struct_return
? 1 : 0;
979 effectively indirect call... gcc does...
981 return_val example( float, int);
984 float in fp0, int in r3
985 offset of stack on overflow 8/16
986 for varargs, must go by type.
988 float in r3&r4, int in r5
989 offset of stack on overflow different
991 return in r3 or f0. If no float, must study how gcc emulates floats;
992 pay attention to arg promotion.
993 User may have to cast\args to handle promotion correctly
994 since gdb won't know if prototype supplied or not.
997 for (argno
= 0, argbytes
= 0; argno
< nargs
&& ii
< 8; ++ii
)
999 int reg_size
= REGISTER_RAW_SIZE (ii
+ 3);
1002 type
= check_typedef (VALUE_TYPE (arg
));
1003 len
= TYPE_LENGTH (type
);
1005 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
1008 /* floating point arguments are passed in fpr's, as well as gpr's.
1009 There are 13 fpr's reserved for passing parameters. At this point
1010 there is no way we would run out of them. */
1014 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
1016 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
+ 1 + f_argno
)],
1017 VALUE_CONTENTS (arg
),
1025 /* Argument takes more than one register. */
1026 while (argbytes
< len
)
1028 memset (®isters
[REGISTER_BYTE (ii
+ 3)], 0, reg_size
);
1029 memcpy (®isters
[REGISTER_BYTE (ii
+ 3)],
1030 ((char *) VALUE_CONTENTS (arg
)) + argbytes
,
1031 (len
- argbytes
) > reg_size
1032 ? reg_size
: len
- argbytes
);
1033 ++ii
, argbytes
+= reg_size
;
1036 goto ran_out_of_registers_for_arguments
;
1042 { /* Argument can fit in one register. No problem. */
1043 int adj
= TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? reg_size
- len
: 0;
1044 memset (®isters
[REGISTER_BYTE (ii
+ 3)], 0, reg_size
);
1045 memcpy ((char *)®isters
[REGISTER_BYTE (ii
+ 3)] + adj
,
1046 VALUE_CONTENTS (arg
), len
);
1051 ran_out_of_registers_for_arguments
:
1053 saved_sp
= read_sp ();
1054 #ifndef ELF_OBJECT_FORMAT
1055 /* location for 8 parameters are always reserved. */
1058 /* another six words for back chain, TOC register, link register, etc. */
1061 /* stack pointer must be quadword aligned */
1065 /* if there are more arguments, allocate space for them in
1066 the stack, then push them starting from the ninth one. */
1068 if ((argno
< nargs
) || argbytes
)
1074 space
+= ((len
- argbytes
+ 3) & -4);
1080 for (; jj
< nargs
; ++jj
)
1082 struct value
*val
= args
[jj
];
1083 space
+= ((TYPE_LENGTH (VALUE_TYPE (val
))) + 3) & -4;
1086 /* add location required for the rest of the parameters */
1087 space
= (space
+ 15) & -16;
1090 /* This is another instance we need to be concerned about securing our
1091 stack space. If we write anything underneath %sp (r1), we might conflict
1092 with the kernel who thinks he is free to use this area. So, update %sp
1093 first before doing anything else. */
1095 write_register (SP_REGNUM
, sp
);
1097 /* if the last argument copied into the registers didn't fit there
1098 completely, push the rest of it into stack. */
1102 write_memory (sp
+ 24 + (ii
* 4),
1103 ((char *) VALUE_CONTENTS (arg
)) + argbytes
,
1106 ii
+= ((len
- argbytes
+ 3) & -4) / 4;
1109 /* push the rest of the arguments into stack. */
1110 for (; argno
< nargs
; ++argno
)
1114 type
= check_typedef (VALUE_TYPE (arg
));
1115 len
= TYPE_LENGTH (type
);
1118 /* float types should be passed in fpr's, as well as in the stack. */
1119 if (TYPE_CODE (type
) == TYPE_CODE_FLT
&& f_argno
< 13)
1124 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
1126 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
+ 1 + f_argno
)],
1127 VALUE_CONTENTS (arg
),
1132 write_memory (sp
+ 24 + (ii
* 4), (char *) VALUE_CONTENTS (arg
), len
);
1133 ii
+= ((len
+ 3) & -4) / 4;
1137 /* Secure stack areas first, before doing anything else. */
1138 write_register (SP_REGNUM
, sp
);
1140 /* set back chain properly */
1141 store_address (tmp_buffer
, 4, saved_sp
);
1142 write_memory (sp
, tmp_buffer
, 4);
1144 target_store_registers (-1);
1148 /* Function: ppc_push_return_address (pc, sp)
1149 Set up the return address for the inferior function call. */
1152 ppc_push_return_address (CORE_ADDR pc
, CORE_ADDR sp
)
1154 write_register (gdbarch_tdep (current_gdbarch
)->ppc_lr_regnum
,
1155 CALL_DUMMY_ADDRESS ());
1159 /* Extract a function return value of type TYPE from raw register array
1160 REGBUF, and copy that return value into VALBUF in virtual format. */
1163 rs6000_extract_return_value (struct type
*valtype
, char *regbuf
, char *valbuf
)
1167 if (TYPE_CODE (valtype
) == TYPE_CODE_FLT
)
1172 /* floats and doubles are returned in fpr1. fpr's have a size of 8 bytes.
1173 We need to truncate the return value into float size (4 byte) if
1176 if (TYPE_LENGTH (valtype
) > 4) /* this is a double */
1178 ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)],
1179 TYPE_LENGTH (valtype
));
1182 memcpy (&dd
, ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)], 8);
1184 memcpy (valbuf
, &ff
, sizeof (float));
1189 /* return value is copied starting from r3. */
1190 if (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
1191 && TYPE_LENGTH (valtype
) < REGISTER_RAW_SIZE (3))
1192 offset
= REGISTER_RAW_SIZE (3) - TYPE_LENGTH (valtype
);
1195 regbuf
+ REGISTER_BYTE (3) + offset
,
1196 TYPE_LENGTH (valtype
));
1200 /* Keep structure return address in this variable.
1201 FIXME: This is a horrid kludge which should not be allowed to continue
1202 living. This only allows a single nested call to a structure-returning
1203 function. Come on, guys! -- gnu@cygnus.com, Aug 92 */
1205 static CORE_ADDR rs6000_struct_return_address
;
1207 /* Return whether handle_inferior_event() should proceed through code
1208 starting at PC in function NAME when stepping.
1210 The AIX -bbigtoc linker option generates functions @FIX0, @FIX1, etc. to
1211 handle memory references that are too distant to fit in instructions
1212 generated by the compiler. For example, if 'foo' in the following
1217 is greater than 32767, the linker might replace the lwz with a branch to
1218 somewhere in @FIX1 that does the load in 2 instructions and then branches
1219 back to where execution should continue.
1221 GDB should silently step over @FIX code, just like AIX dbx does.
1222 Unfortunately, the linker uses the "b" instruction for the branches,
1223 meaning that the link register doesn't get set. Therefore, GDB's usual
1224 step_over_function() mechanism won't work.
1226 Instead, use the IN_SOLIB_RETURN_TRAMPOLINE and SKIP_TRAMPOLINE_CODE hooks
1227 in handle_inferior_event() to skip past @FIX code. */
1230 rs6000_in_solib_return_trampoline (CORE_ADDR pc
, char *name
)
1232 return name
&& !strncmp (name
, "@FIX", 4);
1235 /* Skip code that the user doesn't want to see when stepping:
1237 1. Indirect function calls use a piece of trampoline code to do context
1238 switching, i.e. to set the new TOC table. Skip such code if we are on
1239 its first instruction (as when we have single-stepped to here).
1241 2. Skip shared library trampoline code (which is different from
1242 indirect function call trampolines).
1244 3. Skip bigtoc fixup code.
1246 Result is desired PC to step until, or NULL if we are not in
1247 code that should be skipped. */
1250 rs6000_skip_trampoline_code (CORE_ADDR pc
)
1252 register unsigned int ii
, op
;
1254 CORE_ADDR solib_target_pc
;
1255 struct minimal_symbol
*msymbol
;
1257 static unsigned trampoline_code
[] =
1259 0x800b0000, /* l r0,0x0(r11) */
1260 0x90410014, /* st r2,0x14(r1) */
1261 0x7c0903a6, /* mtctr r0 */
1262 0x804b0004, /* l r2,0x4(r11) */
1263 0x816b0008, /* l r11,0x8(r11) */
1264 0x4e800420, /* bctr */
1265 0x4e800020, /* br */
1269 /* Check for bigtoc fixup code. */
1270 msymbol
= lookup_minimal_symbol_by_pc (pc
);
1271 if (msymbol
&& rs6000_in_solib_return_trampoline (pc
, SYMBOL_NAME (msymbol
)))
1273 /* Double-check that the third instruction from PC is relative "b". */
1274 op
= read_memory_integer (pc
+ 8, 4);
1275 if ((op
& 0xfc000003) == 0x48000000)
1277 /* Extract bits 6-29 as a signed 24-bit relative word address and
1278 add it to the containing PC. */
1279 rel
= ((int)(op
<< 6) >> 6);
1280 return pc
+ 8 + rel
;
1284 /* If pc is in a shared library trampoline, return its target. */
1285 solib_target_pc
= find_solib_trampoline_target (pc
);
1286 if (solib_target_pc
)
1287 return solib_target_pc
;
1289 for (ii
= 0; trampoline_code
[ii
]; ++ii
)
1291 op
= read_memory_integer (pc
+ (ii
* 4), 4);
1292 if (op
!= trampoline_code
[ii
])
1295 ii
= read_register (11); /* r11 holds destination addr */
1296 pc
= read_memory_addr (ii
, TDEP
->wordsize
); /* (r11) value */
1300 /* Determines whether the function FI has a frame on the stack or not. */
1303 rs6000_frameless_function_invocation (struct frame_info
*fi
)
1305 CORE_ADDR func_start
;
1306 struct rs6000_framedata fdata
;
1308 /* Don't even think about framelessness except on the innermost frame
1309 or if the function was interrupted by a signal. */
1310 if (fi
->next
!= NULL
&& !fi
->next
->signal_handler_caller
)
1313 func_start
= get_pc_function_start (fi
->pc
);
1315 /* If we failed to find the start of the function, it is a mistake
1316 to inspect the instructions. */
1320 /* A frame with a zero PC is usually created by dereferencing a NULL
1321 function pointer, normally causing an immediate core dump of the
1322 inferior. Mark function as frameless, as the inferior has no chance
1323 of setting up a stack frame. */
1330 (void) skip_prologue (func_start
, fi
->pc
, &fdata
);
1331 return fdata
.frameless
;
1334 /* Return the PC saved in a frame */
1337 rs6000_frame_saved_pc (struct frame_info
*fi
)
1339 CORE_ADDR func_start
;
1340 struct rs6000_framedata fdata
;
1341 int wordsize
= TDEP
->wordsize
;
1343 if (fi
->signal_handler_caller
)
1344 return read_memory_addr (fi
->frame
+ SIG_FRAME_PC_OFFSET
, wordsize
);
1346 if (PC_IN_CALL_DUMMY (fi
->pc
, fi
->frame
, fi
->frame
))
1347 return generic_read_register_dummy (fi
->pc
, fi
->frame
, PC_REGNUM
);
1349 func_start
= get_pc_function_start (fi
->pc
);
1351 /* If we failed to find the start of the function, it is a mistake
1352 to inspect the instructions. */
1356 (void) skip_prologue (func_start
, fi
->pc
, &fdata
);
1358 if (fdata
.lr_offset
== 0 && fi
->next
!= NULL
)
1360 if (fi
->next
->signal_handler_caller
)
1361 return read_memory_addr (fi
->next
->frame
+ SIG_FRAME_LR_OFFSET
,
1364 return read_memory_addr (FRAME_CHAIN (fi
) + DEFAULT_LR_SAVE
,
1368 if (fdata
.lr_offset
== 0)
1369 return read_register (gdbarch_tdep (current_gdbarch
)->ppc_lr_regnum
);
1371 return read_memory_addr (FRAME_CHAIN (fi
) + fdata
.lr_offset
, wordsize
);
1374 /* If saved registers of frame FI are not known yet, read and cache them.
1375 &FDATAP contains rs6000_framedata; TDATAP can be NULL,
1376 in which case the framedata are read. */
1379 frame_get_saved_regs (struct frame_info
*fi
, struct rs6000_framedata
*fdatap
)
1381 CORE_ADDR frame_addr
;
1382 struct rs6000_framedata work_fdata
;
1383 struct gdbarch_tdep
* tdep
= gdbarch_tdep (current_gdbarch
);
1384 int wordsize
= tdep
->wordsize
;
1391 fdatap
= &work_fdata
;
1392 (void) skip_prologue (get_pc_function_start (fi
->pc
), fi
->pc
, fdatap
);
1395 frame_saved_regs_zalloc (fi
);
1397 /* If there were any saved registers, figure out parent's stack
1399 /* The following is true only if the frame doesn't have a call to
1402 if (fdatap
->saved_fpr
== 0
1403 && fdatap
->saved_gpr
== 0
1404 && fdatap
->saved_vr
== 0
1405 && fdatap
->lr_offset
== 0
1406 && fdatap
->cr_offset
== 0
1407 && fdatap
->vr_offset
== 0)
1409 else if (fi
->prev
&& fi
->prev
->frame
)
1410 frame_addr
= fi
->prev
->frame
;
1412 frame_addr
= read_memory_addr (fi
->frame
, wordsize
);
1414 /* if != -1, fdatap->saved_fpr is the smallest number of saved_fpr.
1415 All fpr's from saved_fpr to fp31 are saved. */
1417 if (fdatap
->saved_fpr
>= 0)
1420 CORE_ADDR fpr_addr
= frame_addr
+ fdatap
->fpr_offset
;
1421 for (i
= fdatap
->saved_fpr
; i
< 32; i
++)
1423 fi
->saved_regs
[FP0_REGNUM
+ i
] = fpr_addr
;
1428 /* if != -1, fdatap->saved_gpr is the smallest number of saved_gpr.
1429 All gpr's from saved_gpr to gpr31 are saved. */
1431 if (fdatap
->saved_gpr
>= 0)
1434 CORE_ADDR gpr_addr
= frame_addr
+ fdatap
->gpr_offset
;
1435 for (i
= fdatap
->saved_gpr
; i
< 32; i
++)
1437 fi
->saved_regs
[i
] = gpr_addr
;
1438 gpr_addr
+= wordsize
;
1442 /* if != -1, fdatap->saved_vr is the smallest number of saved_vr.
1443 All vr's from saved_vr to vr31 are saved. */
1444 if (tdep
->ppc_vr0_regnum
!= -1 && tdep
->ppc_vrsave_regnum
!= -1)
1446 if (fdatap
->saved_vr
>= 0)
1449 CORE_ADDR vr_addr
= frame_addr
+ fdatap
->vr_offset
;
1450 for (i
= fdatap
->saved_vr
; i
< 32; i
++)
1452 fi
->saved_regs
[tdep
->ppc_vr0_regnum
+ i
] = vr_addr
;
1453 vr_addr
+= REGISTER_RAW_SIZE (tdep
->ppc_vr0_regnum
);
1458 /* If != 0, fdatap->cr_offset is the offset from the frame that holds
1460 if (fdatap
->cr_offset
!= 0)
1461 fi
->saved_regs
[tdep
->ppc_cr_regnum
] = frame_addr
+ fdatap
->cr_offset
;
1463 /* If != 0, fdatap->lr_offset is the offset from the frame that holds
1465 if (fdatap
->lr_offset
!= 0)
1466 fi
->saved_regs
[tdep
->ppc_lr_regnum
] = frame_addr
+ fdatap
->lr_offset
;
1468 /* If != 0, fdatap->vrsave_offset is the offset from the frame that holds
1470 if (fdatap
->vrsave_offset
!= 0)
1471 fi
->saved_regs
[tdep
->ppc_vrsave_regnum
] = frame_addr
+ fdatap
->vrsave_offset
;
1474 /* Return the address of a frame. This is the inital %sp value when the frame
1475 was first allocated. For functions calling alloca(), it might be saved in
1476 an alloca register. */
1479 frame_initial_stack_address (struct frame_info
*fi
)
1482 struct rs6000_framedata fdata
;
1483 struct frame_info
*callee_fi
;
1485 /* if the initial stack pointer (frame address) of this frame is known,
1488 if (fi
->extra_info
->initial_sp
)
1489 return fi
->extra_info
->initial_sp
;
1491 /* find out if this function is using an alloca register.. */
1493 (void) skip_prologue (get_pc_function_start (fi
->pc
), fi
->pc
, &fdata
);
1495 /* if saved registers of this frame are not known yet, read and cache them. */
1497 if (!fi
->saved_regs
)
1498 frame_get_saved_regs (fi
, &fdata
);
1500 /* If no alloca register used, then fi->frame is the value of the %sp for
1501 this frame, and it is good enough. */
1503 if (fdata
.alloca_reg
< 0)
1505 fi
->extra_info
->initial_sp
= fi
->frame
;
1506 return fi
->extra_info
->initial_sp
;
1509 /* This function has an alloca register. If this is the top-most frame
1510 (with the lowest address), the value in alloca register is good. */
1513 return fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1515 /* Otherwise, this is a caller frame. Callee has usually already saved
1516 registers, but there are exceptions (such as when the callee
1517 has no parameters). Find the address in which caller's alloca
1518 register is saved. */
1520 for (callee_fi
= fi
->next
; callee_fi
; callee_fi
= callee_fi
->next
)
1523 if (!callee_fi
->saved_regs
)
1524 frame_get_saved_regs (callee_fi
, NULL
);
1526 /* this is the address in which alloca register is saved. */
1528 tmpaddr
= callee_fi
->saved_regs
[fdata
.alloca_reg
];
1531 fi
->extra_info
->initial_sp
=
1532 read_memory_addr (tmpaddr
, TDEP
->wordsize
);
1533 return fi
->extra_info
->initial_sp
;
1536 /* Go look into deeper levels of the frame chain to see if any one of
1537 the callees has saved alloca register. */
1540 /* If alloca register was not saved, by the callee (or any of its callees)
1541 then the value in the register is still good. */
1543 fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1544 return fi
->extra_info
->initial_sp
;
1547 /* Describe the pointer in each stack frame to the previous stack frame
1550 /* FRAME_CHAIN takes a frame's nominal address
1551 and produces the frame's chain-pointer. */
1553 /* In the case of the RS/6000, the frame's nominal address
1554 is the address of a 4-byte word containing the calling frame's address. */
1557 rs6000_frame_chain (struct frame_info
*thisframe
)
1559 CORE_ADDR fp
, fpp
, lr
;
1560 int wordsize
= TDEP
->wordsize
;
1562 if (PC_IN_CALL_DUMMY (thisframe
->pc
, thisframe
->frame
, thisframe
->frame
))
1563 return thisframe
->frame
; /* dummy frame same as caller's frame */
1565 if (inside_entry_file (thisframe
->pc
) ||
1566 thisframe
->pc
== entry_point_address ())
1569 if (thisframe
->signal_handler_caller
)
1570 fp
= read_memory_addr (thisframe
->frame
+ SIG_FRAME_FP_OFFSET
,
1572 else if (thisframe
->next
!= NULL
1573 && thisframe
->next
->signal_handler_caller
1574 && FRAMELESS_FUNCTION_INVOCATION (thisframe
))
1575 /* A frameless function interrupted by a signal did not change the
1577 fp
= FRAME_FP (thisframe
);
1579 fp
= read_memory_addr ((thisframe
)->frame
, wordsize
);
1581 lr
= read_register (gdbarch_tdep (current_gdbarch
)->ppc_lr_regnum
);
1582 if (lr
== entry_point_address ())
1583 if (fp
!= 0 && (fpp
= read_memory_addr (fp
, wordsize
)) != 0)
1584 if (PC_IN_CALL_DUMMY (lr
, fpp
, fpp
))
1590 /* Return the size of register REG when words are WORDSIZE bytes long. If REG
1591 isn't available with that word size, return 0. */
1594 regsize (const struct reg
*reg
, int wordsize
)
1596 return wordsize
== 8 ? reg
->sz64
: reg
->sz32
;
1599 /* Return the name of register number N, or null if no such register exists
1600 in the current architecture. */
1603 rs6000_register_name (int n
)
1605 struct gdbarch_tdep
*tdep
= TDEP
;
1606 const struct reg
*reg
= tdep
->regs
+ n
;
1608 if (!regsize (reg
, tdep
->wordsize
))
1613 /* Index within `registers' of the first byte of the space for
1617 rs6000_register_byte (int n
)
1619 return TDEP
->regoff
[n
];
1622 /* Return the number of bytes of storage in the actual machine representation
1623 for register N if that register is available, else return 0. */
1626 rs6000_register_raw_size (int n
)
1628 struct gdbarch_tdep
*tdep
= TDEP
;
1629 const struct reg
*reg
= tdep
->regs
+ n
;
1630 return regsize (reg
, tdep
->wordsize
);
1633 /* Return the GDB type object for the "standard" data type
1634 of data in register N. */
1636 static struct type
*
1637 rs6000_register_virtual_type (int n
)
1639 struct gdbarch_tdep
*tdep
= TDEP
;
1640 const struct reg
*reg
= tdep
->regs
+ n
;
1643 return builtin_type_double
;
1646 int size
= regsize (reg
, tdep
->wordsize
);
1650 return builtin_type_int64
;
1653 return builtin_type_vec128
;
1656 return builtin_type_int32
;
1662 /* For the PowerPC, it appears that the debug info marks float parameters as
1663 floats regardless of whether the function is prototyped, but the actual
1664 values are always passed in as doubles. Tell gdb to always assume that
1665 floats are passed as doubles and then converted in the callee. */
1668 rs6000_coerce_float_to_double (struct type
*formal
, struct type
*actual
)
1673 /* Return whether register N requires conversion when moving from raw format
1676 The register format for RS/6000 floating point registers is always
1677 double, we need a conversion if the memory format is float. */
1680 rs6000_register_convertible (int n
)
1682 const struct reg
*reg
= TDEP
->regs
+ n
;
1686 /* Convert data from raw format for register N in buffer FROM
1687 to virtual format with type TYPE in buffer TO. */
1690 rs6000_register_convert_to_virtual (int n
, struct type
*type
,
1691 char *from
, char *to
)
1693 if (TYPE_LENGTH (type
) != REGISTER_RAW_SIZE (n
))
1695 double val
= extract_floating (from
, REGISTER_RAW_SIZE (n
));
1696 store_floating (to
, TYPE_LENGTH (type
), val
);
1699 memcpy (to
, from
, REGISTER_RAW_SIZE (n
));
1702 /* Convert data from virtual format with type TYPE in buffer FROM
1703 to raw format for register N in buffer TO. */
1706 rs6000_register_convert_to_raw (struct type
*type
, int n
,
1707 char *from
, char *to
)
1709 if (TYPE_LENGTH (type
) != REGISTER_RAW_SIZE (n
))
1711 double val
= extract_floating (from
, TYPE_LENGTH (type
));
1712 store_floating (to
, REGISTER_RAW_SIZE (n
), val
);
1715 memcpy (to
, from
, REGISTER_RAW_SIZE (n
));
1719 altivec_register_p (int regno
)
1721 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
1722 if (tdep
->ppc_vr0_regnum
< 0 || tdep
->ppc_vrsave_regnum
< 0)
1725 return (regno
>= tdep
->ppc_vr0_regnum
&& regno
<= tdep
->ppc_vrsave_regnum
);
1729 rs6000_do_altivec_registers (int regnum
)
1732 char *raw_buffer
= (char*) alloca (MAX_REGISTER_RAW_SIZE
);
1733 char *virtual_buffer
= (char*) alloca (MAX_REGISTER_VIRTUAL_SIZE
);
1734 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
1736 for (i
= tdep
->ppc_vr0_regnum
; i
<= tdep
->ppc_vrsave_regnum
; i
++)
1738 /* If we want just one reg, check that this is the one we want. */
1739 if (regnum
!= -1 && i
!= regnum
)
1742 /* If the register name is empty, it is undefined for this
1743 processor, so don't display anything. */
1744 if (REGISTER_NAME (i
) == NULL
|| *(REGISTER_NAME (i
)) == '\0')
1747 fputs_filtered (REGISTER_NAME (i
), gdb_stdout
);
1748 print_spaces_filtered (15 - strlen (REGISTER_NAME (i
)), gdb_stdout
);
1750 /* Get the data in raw format. */
1751 if (read_relative_register_raw_bytes (i
, raw_buffer
))
1753 printf_filtered ("*value not available*\n");
1757 /* Convert raw data to virtual format if necessary. */
1758 if (REGISTER_CONVERTIBLE (i
))
1759 REGISTER_CONVERT_TO_VIRTUAL (i
, REGISTER_VIRTUAL_TYPE (i
),
1760 raw_buffer
, virtual_buffer
);
1762 memcpy (virtual_buffer
, raw_buffer
, REGISTER_VIRTUAL_SIZE (i
));
1764 /* Print as integer in hex only. */
1765 val_print (REGISTER_VIRTUAL_TYPE (i
), virtual_buffer
, 0, 0,
1766 gdb_stdout
, 'x', 1, 0, Val_pretty_default
);
1767 printf_filtered ("\n");
1772 rs6000_altivec_registers_info (char *addr_exp
, int from_tty
)
1774 int regnum
, numregs
;
1777 if (!target_has_registers
)
1778 error ("The program has no registers now.");
1779 if (selected_frame
== NULL
)
1780 error ("No selected frame.");
1784 rs6000_do_altivec_registers (-1);
1788 numregs
= NUM_REGS
+ NUM_PSEUDO_REGS
;
1791 if (addr_exp
[0] == '$')
1794 while (*end
!= '\0' && *end
!= ' ' && *end
!= '\t')
1797 regnum
= target_map_name_to_register (addr_exp
, end
- addr_exp
);
1801 if (*addr_exp
>= '0' && *addr_exp
<= '9')
1802 regnum
= atoi (addr_exp
); /* Take a number */
1803 if (regnum
>= numregs
) /* Bad name, or bad number */
1804 error ("%.*s: invalid register", end
- addr_exp
, addr_exp
);
1807 rs6000_do_altivec_registers (regnum
);
1810 while (*addr_exp
== ' ' || *addr_exp
== '\t')
1813 while (*addr_exp
!= '\0');
1817 rs6000_do_registers_info (int regnum
, int fpregs
)
1820 int numregs
= NUM_REGS
+ NUM_PSEUDO_REGS
;
1821 char *raw_buffer
= (char*) alloca (MAX_REGISTER_RAW_SIZE
);
1822 char *virtual_buffer
= (char*) alloca (MAX_REGISTER_VIRTUAL_SIZE
);
1824 for (i
= 0; i
< numregs
; i
++)
1826 /* Decide between printing all regs, nonfloat regs, or specific reg. */
1829 if ((TYPE_CODE (REGISTER_VIRTUAL_TYPE (i
)) == TYPE_CODE_FLT
&& !fpregs
)
1830 || (altivec_register_p (i
) && !fpregs
))
1839 /* If the register name is empty, it is undefined for this
1840 processor, so don't display anything. */
1841 if (REGISTER_NAME (i
) == NULL
|| *(REGISTER_NAME (i
)) == '\0')
1844 fputs_filtered (REGISTER_NAME (i
), gdb_stdout
);
1845 print_spaces_filtered (15 - strlen (REGISTER_NAME (i
)), gdb_stdout
);
1847 /* Get the data in raw format. */
1848 if (read_relative_register_raw_bytes (i
, raw_buffer
))
1850 printf_filtered ("*value not available*\n");
1854 /* Convert raw data to virtual format if necessary. */
1855 if (REGISTER_CONVERTIBLE (i
))
1856 REGISTER_CONVERT_TO_VIRTUAL (i
, REGISTER_VIRTUAL_TYPE (i
),
1857 raw_buffer
, virtual_buffer
);
1859 memcpy (virtual_buffer
, raw_buffer
, REGISTER_VIRTUAL_SIZE (i
));
1861 /* If virtual format is floating, print it that way, and in raw hex. */
1862 if (TYPE_CODE (REGISTER_VIRTUAL_TYPE (i
)) == TYPE_CODE_FLT
)
1866 val_print (REGISTER_VIRTUAL_TYPE (i
), virtual_buffer
, 0, 0,
1867 gdb_stdout
, 0, 1, 0, Val_pretty_default
);
1869 printf_filtered ("\t(raw 0x");
1870 for (j
= 0; j
< REGISTER_RAW_SIZE (i
); j
++)
1872 register int idx
= TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
? j
1873 : REGISTER_RAW_SIZE (i
) - 1 - j
;
1874 printf_filtered ("%02x", (unsigned char) raw_buffer
[idx
]);
1876 printf_filtered (")");
1880 /* Print as integer in hex and in decimal. */
1881 if (!altivec_register_p (i
))
1883 val_print (REGISTER_VIRTUAL_TYPE (i
), virtual_buffer
, 0, 0,
1884 gdb_stdout
, 'x', 1, 0, Val_pretty_default
);
1885 printf_filtered ("\t");
1886 val_print (REGISTER_VIRTUAL_TYPE (i
), virtual_buffer
, 0, 0,
1887 gdb_stdout
, 0, 1, 0, Val_pretty_default
);
1890 /* Print as integer in hex only. */
1891 val_print (REGISTER_VIRTUAL_TYPE (i
), virtual_buffer
, 0, 0,
1892 gdb_stdout
, 'x', 1, 0, Val_pretty_default
);
1894 printf_filtered ("\n");
1898 /* Convert a dbx stab register number (from `r' declaration) to a gdb
1901 rs6000_stab_reg_to_regnum (int num
)
1907 regnum
= gdbarch_tdep (current_gdbarch
)->ppc_mq_regnum
;
1910 regnum
= gdbarch_tdep (current_gdbarch
)->ppc_lr_regnum
;
1913 regnum
= gdbarch_tdep (current_gdbarch
)->ppc_ctr_regnum
;
1916 regnum
= gdbarch_tdep (current_gdbarch
)->ppc_xer_regnum
;
1925 /* Store the address of the place in which to copy the structure the
1926 subroutine will return. This is called from call_function.
1928 In RS/6000, struct return addresses are passed as an extra parameter in r3.
1929 In function return, callee is not responsible of returning this address
1930 back. Since gdb needs to find it, we will store in a designated variable
1931 `rs6000_struct_return_address'. */
1934 rs6000_store_struct_return (CORE_ADDR addr
, CORE_ADDR sp
)
1936 write_register (3, addr
);
1937 rs6000_struct_return_address
= addr
;
1940 /* Write into appropriate registers a function return value
1941 of type TYPE, given in virtual format. */
1944 rs6000_store_return_value (struct type
*type
, char *valbuf
)
1946 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
1948 /* Floating point values are returned starting from FPR1 and up.
1949 Say a double_double_double type could be returned in
1950 FPR1/FPR2/FPR3 triple. */
1952 write_register_bytes (REGISTER_BYTE (FP0_REGNUM
+ 1), valbuf
,
1953 TYPE_LENGTH (type
));
1955 /* Everything else is returned in GPR3 and up. */
1956 write_register_bytes (REGISTER_BYTE (gdbarch_tdep (current_gdbarch
)->ppc_gp0_regnum
+ 3),
1957 valbuf
, TYPE_LENGTH (type
));
1960 /* Extract from an array REGBUF containing the (raw) register state
1961 the address in which a function should return its structure value,
1962 as a CORE_ADDR (or an expression that can be used as one). */
1965 rs6000_extract_struct_value_address (char *regbuf
)
1967 return rs6000_struct_return_address
;
1970 /* Return whether PC is in a dummy function call.
1972 FIXME: This just checks for the end of the stack, which is broken
1973 for things like stepping through gcc nested function stubs. */
1976 rs6000_pc_in_call_dummy (CORE_ADDR pc
, CORE_ADDR sp
, CORE_ADDR fp
)
1978 return sp
< pc
&& pc
< fp
;
1981 /* Hook called when a new child process is started. */
1984 rs6000_create_inferior (int pid
)
1986 if (rs6000_set_host_arch_hook
)
1987 rs6000_set_host_arch_hook (pid
);
1990 /* Support for CONVERT_FROM_FUNC_PTR_ADDR(ADDR).
1992 Usually a function pointer's representation is simply the address
1993 of the function. On the RS/6000 however, a function pointer is
1994 represented by a pointer to a TOC entry. This TOC entry contains
1995 three words, the first word is the address of the function, the
1996 second word is the TOC pointer (r2), and the third word is the
1997 static chain value. Throughout GDB it is currently assumed that a
1998 function pointer contains the address of the function, which is not
1999 easy to fix. In addition, the conversion of a function address to
2000 a function pointer would require allocation of a TOC entry in the
2001 inferior's memory space, with all its drawbacks. To be able to
2002 call C++ virtual methods in the inferior (which are called via
2003 function pointers), find_function_addr uses this function to get the
2004 function address from a function pointer. */
2006 /* Return real function address if ADDR (a function pointer) is in the data
2007 space and is therefore a special function pointer. */
2010 rs6000_convert_from_func_ptr_addr (CORE_ADDR addr
)
2012 struct obj_section
*s
;
2014 s
= find_pc_section (addr
);
2015 if (s
&& s
->the_bfd_section
->flags
& SEC_CODE
)
2018 /* ADDR is in the data space, so it's a special function pointer. */
2019 return read_memory_addr (addr
, TDEP
->wordsize
);
2023 /* Handling the various POWER/PowerPC variants. */
2026 /* The arrays here called registers_MUMBLE hold information about available
2029 For each family of PPC variants, I've tried to isolate out the
2030 common registers and put them up front, so that as long as you get
2031 the general family right, GDB will correctly identify the registers
2032 common to that family. The common register sets are:
2034 For the 60x family: hid0 hid1 iabr dabr pir
2036 For the 505 and 860 family: eie eid nri
2038 For the 403 and 403GC: icdbdr esr dear evpr cdbcr tsr tcr pit tbhi
2039 tblo srr2 srr3 dbsr dbcr iac1 iac2 dac1 dac2 dccr iccr pbl1
2042 Most of these register groups aren't anything formal. I arrived at
2043 them by looking at the registers that occurred in more than one
2046 /* Convenience macros for populating register arrays. */
2048 /* Within another macro, convert S to a string. */
2052 /* Return a struct reg defining register NAME that's 32 bits on 32-bit systems
2053 and 64 bits on 64-bit systems. */
2054 #define R(name) { STR(name), 4, 8, 0 }
2056 /* Return a struct reg defining register NAME that's 32 bits on all
2058 #define R4(name) { STR(name), 4, 4, 0 }
2060 /* Return a struct reg defining register NAME that's 64 bits on all
2062 #define R8(name) { STR(name), 8, 8, 0 }
2064 /* Return a struct reg defining register NAME that's 128 bits on all
2066 #define R16(name) { STR(name), 16, 16, 0 }
2068 /* Return a struct reg defining floating-point register NAME. */
2069 #define F(name) { STR(name), 8, 8, 1 }
2071 /* Return a struct reg defining register NAME that's 32 bits on 32-bit
2072 systems and that doesn't exist on 64-bit systems. */
2073 #define R32(name) { STR(name), 4, 0, 0 }
2075 /* Return a struct reg defining register NAME that's 64 bits on 64-bit
2076 systems and that doesn't exist on 32-bit systems. */
2077 #define R64(name) { STR(name), 0, 8, 0 }
2079 /* Return a struct reg placeholder for a register that doesn't exist. */
2080 #define R0 { 0, 0, 0, 0 }
2082 /* UISA registers common across all architectures, including POWER. */
2084 #define COMMON_UISA_REGS \
2085 /* 0 */ R(r0), R(r1), R(r2), R(r3), R(r4), R(r5), R(r6), R(r7), \
2086 /* 8 */ R(r8), R(r9), R(r10),R(r11),R(r12),R(r13),R(r14),R(r15), \
2087 /* 16 */ R(r16),R(r17),R(r18),R(r19),R(r20),R(r21),R(r22),R(r23), \
2088 /* 24 */ R(r24),R(r25),R(r26),R(r27),R(r28),R(r29),R(r30),R(r31), \
2089 /* 32 */ F(f0), F(f1), F(f2), F(f3), F(f4), F(f5), F(f6), F(f7), \
2090 /* 40 */ F(f8), F(f9), F(f10),F(f11),F(f12),F(f13),F(f14),F(f15), \
2091 /* 48 */ F(f16),F(f17),F(f18),F(f19),F(f20),F(f21),F(f22),F(f23), \
2092 /* 56 */ F(f24),F(f25),F(f26),F(f27),F(f28),F(f29),F(f30),F(f31), \
2093 /* 64 */ R(pc), R(ps)
2095 /* UISA-level SPRs for PowerPC. */
2096 #define PPC_UISA_SPRS \
2097 /* 66 */ R4(cr), R(lr), R(ctr), R4(xer), R0
2099 /* Segment registers, for PowerPC. */
2100 #define PPC_SEGMENT_REGS \
2101 /* 71 */ R32(sr0), R32(sr1), R32(sr2), R32(sr3), \
2102 /* 75 */ R32(sr4), R32(sr5), R32(sr6), R32(sr7), \
2103 /* 79 */ R32(sr8), R32(sr9), R32(sr10), R32(sr11), \
2104 /* 83 */ R32(sr12), R32(sr13), R32(sr14), R32(sr15)
2106 /* OEA SPRs for PowerPC. */
2107 #define PPC_OEA_SPRS \
2109 /* 88 */ R(ibat0u), R(ibat0l), R(ibat1u), R(ibat1l), \
2110 /* 92 */ R(ibat2u), R(ibat2l), R(ibat3u), R(ibat3l), \
2111 /* 96 */ R(dbat0u), R(dbat0l), R(dbat1u), R(dbat1l), \
2112 /* 100 */ R(dbat2u), R(dbat2l), R(dbat3u), R(dbat3l), \
2113 /* 104 */ R(sdr1), R64(asr), R(dar), R4(dsisr), \
2114 /* 108 */ R(sprg0), R(sprg1), R(sprg2), R(sprg3), \
2115 /* 112 */ R(srr0), R(srr1), R(tbl), R(tbu), \
2116 /* 116 */ R4(dec), R(dabr), R4(ear)
2118 /* AltiVec registers */
2119 #define PPC_ALTIVEC_REGS \
2120 /*119*/R16(vr0), R16(vr1), R16(vr2), R16(vr3), R16(vr4), R16(vr5), R16(vr6), R16(vr7), \
2121 /*127*/R16(vr8), R16(vr9), R16(vr10),R16(vr11),R16(vr12),R16(vr13),R16(vr14),R16(vr15), \
2122 /*135*/R16(vr16),R16(vr17),R16(vr18),R16(vr19),R16(vr20),R16(vr21),R16(vr22),R16(vr23), \
2123 /*143*/R16(vr24),R16(vr25),R16(vr26),R16(vr27),R16(vr28),R16(vr29),R16(vr30),R16(vr31), \
2124 /*151*/R4(vscr), R4(vrsave)
2126 /* IBM POWER (pre-PowerPC) architecture, user-level view. We only cover
2127 user-level SPR's. */
2128 static const struct reg registers_power
[] =
2131 /* 66 */ R4(cnd
), R(lr
), R(cnt
), R4(xer
), R4(mq
)
2134 /* PowerPC UISA - a PPC processor as viewed by user-level code. A UISA-only
2135 view of the PowerPC. */
2136 static const struct reg registers_powerpc
[] =
2143 /* IBM PowerPC 403. */
2144 static const struct reg registers_403
[] =
2150 /* 119 */ R(icdbdr
), R(esr
), R(dear
), R(evpr
),
2151 /* 123 */ R(cdbcr
), R(tsr
), R(tcr
), R(pit
),
2152 /* 127 */ R(tbhi
), R(tblo
), R(srr2
), R(srr3
),
2153 /* 131 */ R(dbsr
), R(dbcr
), R(iac1
), R(iac2
),
2154 /* 135 */ R(dac1
), R(dac2
), R(dccr
), R(iccr
),
2155 /* 139 */ R(pbl1
), R(pbu1
), R(pbl2
), R(pbu2
)
2158 /* IBM PowerPC 403GC. */
2159 static const struct reg registers_403GC
[] =
2165 /* 119 */ R(icdbdr
), R(esr
), R(dear
), R(evpr
),
2166 /* 123 */ R(cdbcr
), R(tsr
), R(tcr
), R(pit
),
2167 /* 127 */ R(tbhi
), R(tblo
), R(srr2
), R(srr3
),
2168 /* 131 */ R(dbsr
), R(dbcr
), R(iac1
), R(iac2
),
2169 /* 135 */ R(dac1
), R(dac2
), R(dccr
), R(iccr
),
2170 /* 139 */ R(pbl1
), R(pbu1
), R(pbl2
), R(pbu2
),
2171 /* 143 */ R(zpr
), R(pid
), R(sgr
), R(dcwr
),
2172 /* 147 */ R(tbhu
), R(tblu
)
2175 /* Motorola PowerPC 505. */
2176 static const struct reg registers_505
[] =
2182 /* 119 */ R(eie
), R(eid
), R(nri
)
2185 /* Motorola PowerPC 860 or 850. */
2186 static const struct reg registers_860
[] =
2192 /* 119 */ R(eie
), R(eid
), R(nri
), R(cmpa
),
2193 /* 123 */ R(cmpb
), R(cmpc
), R(cmpd
), R(icr
),
2194 /* 127 */ R(der
), R(counta
), R(countb
), R(cmpe
),
2195 /* 131 */ R(cmpf
), R(cmpg
), R(cmph
), R(lctrl1
),
2196 /* 135 */ R(lctrl2
), R(ictrl
), R(bar
), R(ic_cst
),
2197 /* 139 */ R(ic_adr
), R(ic_dat
), R(dc_cst
), R(dc_adr
),
2198 /* 143 */ R(dc_dat
), R(dpdr
), R(dpir
), R(immr
),
2199 /* 147 */ R(mi_ctr
), R(mi_ap
), R(mi_epn
), R(mi_twc
),
2200 /* 151 */ R(mi_rpn
), R(md_ctr
), R(m_casid
), R(md_ap
),
2201 /* 155 */ R(md_epn
), R(md_twb
), R(md_twc
), R(md_rpn
),
2202 /* 159 */ R(m_tw
), R(mi_dbcam
), R(mi_dbram0
), R(mi_dbram1
),
2203 /* 163 */ R(md_dbcam
), R(md_dbram0
), R(md_dbram1
)
2206 /* Motorola PowerPC 601. Note that the 601 has different register numbers
2207 for reading and writing RTCU and RTCL. However, how one reads and writes a
2208 register is the stub's problem. */
2209 static const struct reg registers_601
[] =
2215 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
2216 /* 123 */ R(pir
), R(mq
), R(rtcu
), R(rtcl
)
2219 /* Motorola PowerPC 602. */
2220 static const struct reg registers_602
[] =
2226 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R0
,
2227 /* 123 */ R0
, R(tcr
), R(ibr
), R(esassr
),
2228 /* 127 */ R(sebr
), R(ser
), R(sp
), R(lt
)
2231 /* Motorola/IBM PowerPC 603 or 603e. */
2232 static const struct reg registers_603
[] =
2238 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R0
,
2239 /* 123 */ R0
, R(dmiss
), R(dcmp
), R(hash1
),
2240 /* 127 */ R(hash2
), R(imiss
), R(icmp
), R(rpa
)
2243 /* Motorola PowerPC 604 or 604e. */
2244 static const struct reg registers_604
[] =
2250 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
2251 /* 123 */ R(pir
), R(mmcr0
), R(pmc1
), R(pmc2
),
2252 /* 127 */ R(sia
), R(sda
)
2255 /* Motorola/IBM PowerPC 750 or 740. */
2256 static const struct reg registers_750
[] =
2262 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
2263 /* 123 */ R0
, R(ummcr0
), R(upmc1
), R(upmc2
),
2264 /* 127 */ R(usia
), R(ummcr1
), R(upmc3
), R(upmc4
),
2265 /* 131 */ R(mmcr0
), R(pmc1
), R(pmc2
), R(sia
),
2266 /* 135 */ R(mmcr1
), R(pmc3
), R(pmc4
), R(l2cr
),
2267 /* 139 */ R(ictc
), R(thrm1
), R(thrm2
), R(thrm3
)
2271 /* Motorola PowerPC 7400. */
2272 static const struct reg registers_7400
[] =
2274 /* gpr0-gpr31, fpr0-fpr31 */
2276 /* ctr, xre, lr, cr */
2281 /* vr0-vr31, vrsave, vscr */
2283 /* FIXME? Add more registers? */
2286 /* Information about a particular processor variant. */
2290 /* Name of this variant. */
2293 /* English description of the variant. */
2296 /* bfd_arch_info.arch corresponding to variant. */
2297 enum bfd_architecture arch
;
2299 /* bfd_arch_info.mach corresponding to variant. */
2302 /* Table of register names; registers[R] is the name of the register
2305 const struct reg
*regs
;
2308 #define num_registers(list) (sizeof (list) / sizeof((list)[0]))
2311 /* Information in this table comes from the following web sites:
2312 IBM: http://www.chips.ibm.com:80/products/embedded/
2313 Motorola: http://www.mot.com/SPS/PowerPC/
2315 I'm sure I've got some of the variant descriptions not quite right.
2316 Please report any inaccuracies you find to GDB's maintainer.
2318 If you add entries to this table, please be sure to allow the new
2319 value as an argument to the --with-cpu flag, in configure.in. */
2321 static const struct variant variants
[] =
2323 {"powerpc", "PowerPC user-level", bfd_arch_powerpc
,
2324 bfd_mach_ppc
, num_registers (registers_powerpc
), registers_powerpc
},
2325 {"power", "POWER user-level", bfd_arch_rs6000
,
2326 bfd_mach_rs6k
, num_registers (registers_power
), registers_power
},
2327 {"403", "IBM PowerPC 403", bfd_arch_powerpc
,
2328 bfd_mach_ppc_403
, num_registers (registers_403
), registers_403
},
2329 {"601", "Motorola PowerPC 601", bfd_arch_powerpc
,
2330 bfd_mach_ppc_601
, num_registers (registers_601
), registers_601
},
2331 {"602", "Motorola PowerPC 602", bfd_arch_powerpc
,
2332 bfd_mach_ppc_602
, num_registers (registers_602
), registers_602
},
2333 {"603", "Motorola/IBM PowerPC 603 or 603e", bfd_arch_powerpc
,
2334 bfd_mach_ppc_603
, num_registers (registers_603
), registers_603
},
2335 {"604", "Motorola PowerPC 604 or 604e", bfd_arch_powerpc
,
2336 604, num_registers (registers_604
), registers_604
},
2337 {"403GC", "IBM PowerPC 403GC", bfd_arch_powerpc
,
2338 bfd_mach_ppc_403gc
, num_registers (registers_403GC
), registers_403GC
},
2339 {"505", "Motorola PowerPC 505", bfd_arch_powerpc
,
2340 bfd_mach_ppc_505
, num_registers (registers_505
), registers_505
},
2341 {"860", "Motorola PowerPC 860 or 850", bfd_arch_powerpc
,
2342 bfd_mach_ppc_860
, num_registers (registers_860
), registers_860
},
2343 {"750", "Motorola/IBM PowerPC 750 or 740", bfd_arch_powerpc
,
2344 bfd_mach_ppc_750
, num_registers (registers_750
), registers_750
},
2345 {"7400", "Motorola/IBM PowerPC 7400 (G4)", bfd_arch_powerpc
,
2346 bfd_mach_ppc_7400
, num_registers (registers_7400
), registers_7400
},
2348 /* FIXME: I haven't checked the register sets of the following. */
2349 {"620", "Motorola PowerPC 620", bfd_arch_powerpc
,
2350 bfd_mach_ppc_620
, num_registers (registers_powerpc
), registers_powerpc
},
2351 {"a35", "PowerPC A35", bfd_arch_powerpc
,
2352 bfd_mach_ppc_a35
, num_registers (registers_powerpc
), registers_powerpc
},
2353 {"rs1", "IBM POWER RS1", bfd_arch_rs6000
,
2354 bfd_mach_rs6k_rs1
, num_registers (registers_power
), registers_power
},
2355 {"rsc", "IBM POWER RSC", bfd_arch_rs6000
,
2356 bfd_mach_rs6k_rsc
, num_registers (registers_power
), registers_power
},
2357 {"rs2", "IBM POWER RS2", bfd_arch_rs6000
,
2358 bfd_mach_rs6k_rs2
, num_registers (registers_power
), registers_power
},
2363 #undef num_registers
2365 /* Return the variant corresponding to architecture ARCH and machine number
2366 MACH. If no such variant exists, return null. */
2368 static const struct variant
*
2369 find_variant_by_arch (enum bfd_architecture arch
, unsigned long mach
)
2371 const struct variant
*v
;
2373 for (v
= variants
; v
->name
; v
++)
2374 if (arch
== v
->arch
&& mach
== v
->mach
)
2384 process_note_abi_tag_sections (bfd
*abfd
, asection
*sect
, void *obj
)
2386 int *os_ident_ptr
= obj
;
2388 unsigned int sectsize
;
2390 name
= bfd_get_section_name (abfd
, sect
);
2391 sectsize
= bfd_section_size (abfd
, sect
);
2392 if (strcmp (name
, ".note.ABI-tag") == 0 && sectsize
> 0)
2394 unsigned int name_length
, data_length
, note_type
;
2395 char *note
= alloca (sectsize
);
2397 bfd_get_section_contents (abfd
, sect
, note
,
2398 (file_ptr
) 0, (bfd_size_type
) sectsize
);
2400 name_length
= bfd_h_get_32 (abfd
, note
);
2401 data_length
= bfd_h_get_32 (abfd
, note
+ 4);
2402 note_type
= bfd_h_get_32 (abfd
, note
+ 8);
2404 if (name_length
== 4 && data_length
== 16 && note_type
== 1
2405 && strcmp (note
+ 12, "GNU") == 0)
2407 int os_number
= bfd_h_get_32 (abfd
, note
+ 16);
2409 /* The case numbers are from abi-tags in glibc */
2413 *os_ident_ptr
= ELFOSABI_LINUX
;
2416 *os_ident_ptr
= ELFOSABI_HURD
;
2419 *os_ident_ptr
= ELFOSABI_SOLARIS
;
2422 internal_error (__FILE__
, __LINE__
,
2423 "process_note_abi_sections: unknown OS number %d",
2431 /* Return one of the ELFOSABI_ constants for BFDs representing ELF
2432 executables. If it's not an ELF executable or if the OS/ABI couldn't
2433 be determined, simply return -1. */
2436 get_elfosabi (bfd
*abfd
)
2440 if (abfd
!= NULL
&& bfd_get_flavour (abfd
) == bfd_target_elf_flavour
)
2442 elfosabi
= elf_elfheader (abfd
)->e_ident
[EI_OSABI
];
2444 /* When elfosabi is 0 (ELFOSABI_NONE), this is supposed to indicate
2445 that we're on a SYSV system. However, GNU/Linux uses a note section
2446 to record OS/ABI info, but leaves e_ident[EI_OSABI] zero. So we
2447 have to check the note sections too. */
2450 bfd_map_over_sections (abfd
,
2451 process_note_abi_tag_sections
,
2461 /* Initialize the current architecture based on INFO. If possible, re-use an
2462 architecture from ARCHES, which is a list of architectures already created
2463 during this debugging session.
2465 Called e.g. at program startup, when reading a core file, and when reading
2468 static struct gdbarch
*
2469 rs6000_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
2471 struct gdbarch
*gdbarch
;
2472 struct gdbarch_tdep
*tdep
;
2473 int wordsize
, from_xcoff_exec
, from_elf_exec
, power
, i
, off
;
2475 const struct variant
*v
;
2476 enum bfd_architecture arch
;
2479 int osabi
, sysv_abi
;
2481 from_xcoff_exec
= info
.abfd
&& info
.abfd
->format
== bfd_object
&&
2482 bfd_get_flavour (info
.abfd
) == bfd_target_xcoff_flavour
;
2484 from_elf_exec
= info
.abfd
&& info
.abfd
->format
== bfd_object
&&
2485 bfd_get_flavour (info
.abfd
) == bfd_target_elf_flavour
;
2487 sysv_abi
= info
.abfd
&& bfd_get_flavour (info
.abfd
) == bfd_target_elf_flavour
;
2489 osabi
= get_elfosabi (info
.abfd
);
2491 /* Check word size. If INFO is from a binary file, infer it from
2492 that, else choose a likely default. */
2493 if (from_xcoff_exec
)
2495 if (xcoff_data (info
.abfd
)->xcoff64
)
2500 else if (from_elf_exec
)
2502 if (elf_elfheader (info
.abfd
)->e_ident
[EI_CLASS
] == ELFCLASS64
)
2512 /* Find a candidate among extant architectures. */
2513 for (arches
= gdbarch_list_lookup_by_info (arches
, &info
);
2515 arches
= gdbarch_list_lookup_by_info (arches
->next
, &info
))
2517 /* Word size in the various PowerPC bfd_arch_info structs isn't
2518 meaningful, because 64-bit CPUs can run in 32-bit mode. So, perform
2519 separate word size check. */
2520 tdep
= gdbarch_tdep (arches
->gdbarch
);
2521 if (tdep
&& tdep
->wordsize
== wordsize
&& tdep
->osabi
== osabi
)
2522 return arches
->gdbarch
;
2525 /* None found, create a new architecture from INFO, whose bfd_arch_info
2526 validity depends on the source:
2527 - executable useless
2528 - rs6000_host_arch() good
2530 - "set arch" trust blindly
2531 - GDB startup useless but harmless */
2533 if (!from_xcoff_exec
)
2535 arch
= info
.bfd_arch_info
->arch
;
2536 mach
= info
.bfd_arch_info
->mach
;
2540 arch
= bfd_arch_powerpc
;
2542 bfd_default_set_arch_mach (&abfd
, arch
, mach
);
2543 info
.bfd_arch_info
= bfd_get_arch_info (&abfd
);
2545 tdep
= xmalloc (sizeof (struct gdbarch_tdep
));
2546 tdep
->wordsize
= wordsize
;
2547 tdep
->osabi
= osabi
;
2548 gdbarch
= gdbarch_alloc (&info
, tdep
);
2549 power
= arch
== bfd_arch_rs6000
;
2551 /* Select instruction printer. */
2552 tm_print_insn
= arch
== power
? print_insn_rs6000
:
2553 info
.byte_order
== BFD_ENDIAN_BIG
? print_insn_big_powerpc
:
2554 print_insn_little_powerpc
;
2556 /* Choose variant. */
2557 v
= find_variant_by_arch (arch
, mach
);
2561 tdep
->regs
= v
->regs
;
2563 tdep
->ppc_gp0_regnum
= 0;
2564 tdep
->ppc_gplast_regnum
= 31;
2565 tdep
->ppc_toc_regnum
= 2;
2566 tdep
->ppc_ps_regnum
= 65;
2567 tdep
->ppc_cr_regnum
= 66;
2568 tdep
->ppc_lr_regnum
= 67;
2569 tdep
->ppc_ctr_regnum
= 68;
2570 tdep
->ppc_xer_regnum
= 69;
2571 if (v
->mach
== bfd_mach_ppc_601
)
2572 tdep
->ppc_mq_regnum
= 124;
2574 tdep
->ppc_mq_regnum
= 70;
2576 if (v
->arch
== bfd_arch_powerpc
)
2580 tdep
->ppc_vr0_regnum
= 71;
2581 tdep
->ppc_vrsave_regnum
= 104;
2583 case bfd_mach_ppc_7400
:
2584 tdep
->ppc_vr0_regnum
= 119;
2585 tdep
->ppc_vrsave_regnum
= 153;
2588 tdep
->ppc_vr0_regnum
= -1;
2589 tdep
->ppc_vrsave_regnum
= -1;
2593 /* Calculate byte offsets in raw register array. */
2594 tdep
->regoff
= xmalloc (v
->nregs
* sizeof (int));
2595 for (i
= off
= 0; i
< v
->nregs
; i
++)
2597 tdep
->regoff
[i
] = off
;
2598 off
+= regsize (v
->regs
+ i
, wordsize
);
2601 set_gdbarch_read_pc (gdbarch
, generic_target_read_pc
);
2602 set_gdbarch_write_pc (gdbarch
, generic_target_write_pc
);
2603 set_gdbarch_read_fp (gdbarch
, generic_target_read_fp
);
2604 set_gdbarch_write_fp (gdbarch
, generic_target_write_fp
);
2605 set_gdbarch_read_sp (gdbarch
, generic_target_read_sp
);
2606 set_gdbarch_write_sp (gdbarch
, generic_target_write_sp
);
2608 set_gdbarch_num_regs (gdbarch
, v
->nregs
);
2609 set_gdbarch_sp_regnum (gdbarch
, 1);
2610 set_gdbarch_fp_regnum (gdbarch
, 1);
2611 set_gdbarch_pc_regnum (gdbarch
, 64);
2612 set_gdbarch_register_name (gdbarch
, rs6000_register_name
);
2613 set_gdbarch_register_size (gdbarch
, wordsize
);
2614 set_gdbarch_register_bytes (gdbarch
, off
);
2615 set_gdbarch_register_byte (gdbarch
, rs6000_register_byte
);
2616 set_gdbarch_register_raw_size (gdbarch
, rs6000_register_raw_size
);
2617 set_gdbarch_max_register_raw_size (gdbarch
, 16);
2618 set_gdbarch_register_virtual_size (gdbarch
, generic_register_virtual_size
);
2619 set_gdbarch_max_register_virtual_size (gdbarch
, 16);
2620 set_gdbarch_register_virtual_type (gdbarch
, rs6000_register_virtual_type
);
2621 set_gdbarch_do_registers_info (gdbarch
, rs6000_do_registers_info
);
2623 set_gdbarch_ptr_bit (gdbarch
, wordsize
* TARGET_CHAR_BIT
);
2624 set_gdbarch_short_bit (gdbarch
, 2 * TARGET_CHAR_BIT
);
2625 set_gdbarch_int_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
2626 set_gdbarch_long_bit (gdbarch
, wordsize
* TARGET_CHAR_BIT
);
2627 set_gdbarch_long_long_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2628 set_gdbarch_float_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
2629 set_gdbarch_double_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2630 set_gdbarch_long_double_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2631 set_gdbarch_char_signed (gdbarch
, 0);
2633 set_gdbarch_use_generic_dummy_frames (gdbarch
, 1);
2634 set_gdbarch_call_dummy_length (gdbarch
, 0);
2635 set_gdbarch_call_dummy_location (gdbarch
, AT_ENTRY_POINT
);
2636 set_gdbarch_call_dummy_address (gdbarch
, entry_point_address
);
2637 set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch
, 1);
2638 set_gdbarch_call_dummy_breakpoint_offset (gdbarch
, 0);
2639 set_gdbarch_call_dummy_start_offset (gdbarch
, 0);
2640 set_gdbarch_pc_in_call_dummy (gdbarch
, generic_pc_in_call_dummy
);
2641 set_gdbarch_call_dummy_p (gdbarch
, 1);
2642 set_gdbarch_call_dummy_stack_adjust_p (gdbarch
, 0);
2643 set_gdbarch_get_saved_register (gdbarch
, generic_get_saved_register
);
2644 set_gdbarch_fix_call_dummy (gdbarch
, rs6000_fix_call_dummy
);
2645 set_gdbarch_push_dummy_frame (gdbarch
, generic_push_dummy_frame
);
2646 set_gdbarch_save_dummy_frame_tos (gdbarch
, generic_save_dummy_frame_tos
);
2647 set_gdbarch_push_return_address (gdbarch
, ppc_push_return_address
);
2648 set_gdbarch_believe_pcc_promotion (gdbarch
, 1);
2649 set_gdbarch_coerce_float_to_double (gdbarch
, rs6000_coerce_float_to_double
);
2651 set_gdbarch_register_convertible (gdbarch
, rs6000_register_convertible
);
2652 set_gdbarch_register_convert_to_virtual (gdbarch
, rs6000_register_convert_to_virtual
);
2653 set_gdbarch_register_convert_to_raw (gdbarch
, rs6000_register_convert_to_raw
);
2654 set_gdbarch_stab_reg_to_regnum (gdbarch
, rs6000_stab_reg_to_regnum
);
2656 set_gdbarch_extract_return_value (gdbarch
, rs6000_extract_return_value
);
2659 set_gdbarch_push_arguments (gdbarch
, ppc_sysv_abi_push_arguments
);
2661 set_gdbarch_push_arguments (gdbarch
, rs6000_push_arguments
);
2663 set_gdbarch_store_struct_return (gdbarch
, rs6000_store_struct_return
);
2664 set_gdbarch_store_return_value (gdbarch
, rs6000_store_return_value
);
2665 set_gdbarch_extract_struct_value_address (gdbarch
, rs6000_extract_struct_value_address
);
2666 set_gdbarch_pop_frame (gdbarch
, rs6000_pop_frame
);
2668 set_gdbarch_skip_prologue (gdbarch
, rs6000_skip_prologue
);
2669 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
2670 set_gdbarch_decr_pc_after_break (gdbarch
, 0);
2671 set_gdbarch_function_start_offset (gdbarch
, 0);
2672 set_gdbarch_breakpoint_from_pc (gdbarch
, rs6000_breakpoint_from_pc
);
2674 /* Not sure on this. FIXMEmgo */
2675 set_gdbarch_frame_args_skip (gdbarch
, 8);
2677 /* Until November 2001, gcc was not complying to the SYSV ABI for
2678 returning structures less than or equal to 8 bytes in size. It was
2679 returning everything in memory. When this was corrected, it wasn't
2680 fixed for native platforms. */
2683 if (osabi
== ELFOSABI_LINUX
2684 || osabi
== ELFOSABI_NETBSD
2685 || osabi
== ELFOSABI_FREEBSD
)
2686 set_gdbarch_use_struct_convention (gdbarch
,
2687 generic_use_struct_convention
);
2689 set_gdbarch_use_struct_convention (gdbarch
,
2690 ppc_sysv_abi_use_struct_convention
);
2694 set_gdbarch_use_struct_convention (gdbarch
,
2695 generic_use_struct_convention
);
2698 set_gdbarch_frame_chain_valid (gdbarch
, file_frame_chain_valid
);
2699 if (osabi
== ELFOSABI_LINUX
)
2701 set_gdbarch_frameless_function_invocation (gdbarch
,
2702 ppc_linux_frameless_function_invocation
);
2703 set_gdbarch_frame_chain (gdbarch
, ppc_linux_frame_chain
);
2704 set_gdbarch_frame_saved_pc (gdbarch
, ppc_linux_frame_saved_pc
);
2706 set_gdbarch_frame_init_saved_regs (gdbarch
,
2707 ppc_linux_frame_init_saved_regs
);
2708 set_gdbarch_init_extra_frame_info (gdbarch
,
2709 ppc_linux_init_extra_frame_info
);
2711 set_gdbarch_memory_remove_breakpoint (gdbarch
,
2712 ppc_linux_memory_remove_breakpoint
);
2713 set_solib_svr4_fetch_link_map_offsets
2714 (gdbarch
, ppc_linux_svr4_fetch_link_map_offsets
);
2718 set_gdbarch_frameless_function_invocation (gdbarch
,
2719 rs6000_frameless_function_invocation
);
2720 set_gdbarch_frame_chain (gdbarch
, rs6000_frame_chain
);
2721 set_gdbarch_frame_saved_pc (gdbarch
, rs6000_frame_saved_pc
);
2723 set_gdbarch_frame_init_saved_regs (gdbarch
, rs6000_frame_init_saved_regs
);
2724 set_gdbarch_init_extra_frame_info (gdbarch
, rs6000_init_extra_frame_info
);
2726 /* Handle RS/6000 function pointers. */
2727 set_gdbarch_convert_from_func_ptr_addr (gdbarch
,
2728 rs6000_convert_from_func_ptr_addr
);
2730 set_gdbarch_frame_args_address (gdbarch
, rs6000_frame_args_address
);
2731 set_gdbarch_frame_locals_address (gdbarch
, rs6000_frame_args_address
);
2732 set_gdbarch_saved_pc_after_call (gdbarch
, rs6000_saved_pc_after_call
);
2734 /* We can't tell how many args there are
2735 now that the C compiler delays popping them. */
2736 set_gdbarch_frame_num_args (gdbarch
, frame_num_args_unknown
);
2741 static struct cmd_list_element
*info_powerpc_cmdlist
= NULL
;
2744 rs6000_info_powerpc_command (char *args
, int from_tty
)
2746 help_list (info_powerpc_cmdlist
, "info powerpc ", class_info
, gdb_stdout
);
2749 /* Initialization code. */
2752 _initialize_rs6000_tdep (void)
2754 register_gdbarch_init (bfd_arch_rs6000
, rs6000_gdbarch_init
);
2755 register_gdbarch_init (bfd_arch_powerpc
, rs6000_gdbarch_init
);
2757 /* Add root prefix command for "info powerpc" commands */
2758 add_prefix_cmd ("powerpc", class_info
, rs6000_info_powerpc_command
,
2759 "Various POWERPC info specific commands.",
2760 &info_powerpc_cmdlist
, "info powerpc ", 0, &infolist
);
2762 add_cmd ("altivec", class_info
, rs6000_altivec_registers_info
,
2763 "Display the contents of the AltiVec registers.",
2764 &info_powerpc_cmdlist
);