1 /* Target-dependent code for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996,
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"
34 #include "bfd/libbfd.h" /* for bfd_default_set_arch_mach */
35 #include "coff/internal.h" /* for libcoff.h */
36 #include "bfd/libcoff.h" /* for xcoff_data */
42 /* If the kernel has to deliver a signal, it pushes a sigcontext
43 structure on the stack and then calls the signal handler, passing
44 the address of the sigcontext in an argument register. Usually
45 the signal handler doesn't save this register, so we have to
46 access the sigcontext structure via an offset from the signal handler
48 The following constants were determined by experimentation on AIX 3.2. */
49 #define SIG_FRAME_PC_OFFSET 96
50 #define SIG_FRAME_LR_OFFSET 108
51 #define SIG_FRAME_FP_OFFSET 284
53 /* To be used by skip_prologue. */
55 struct rs6000_framedata
57 int offset
; /* total size of frame --- the distance
58 by which we decrement sp to allocate
60 int saved_gpr
; /* smallest # of saved gpr */
61 int saved_fpr
; /* smallest # of saved fpr */
62 int alloca_reg
; /* alloca register number (frame ptr) */
63 char frameless
; /* true if frameless functions. */
64 char nosavedpc
; /* true if pc not saved. */
65 int gpr_offset
; /* offset of saved gprs from prev sp */
66 int fpr_offset
; /* offset of saved fprs from prev sp */
67 int lr_offset
; /* offset of saved lr */
68 int cr_offset
; /* offset of saved cr */
71 /* Description of a single register. */
75 char *name
; /* name of register */
76 unsigned char sz32
; /* size on 32-bit arch, 0 if nonextant */
77 unsigned char sz64
; /* size on 64-bit arch, 0 if nonextant */
78 unsigned char fpr
; /* whether register is floating-point */
81 /* Private data that this module attaches to struct gdbarch. */
85 int wordsize
; /* size in bytes of fixed-point word */
86 int osabi
; /* OS / ABI from ELF header */
87 int *regoff
; /* byte offsets in register arrays */
88 const struct reg
*regs
; /* from current variant */
91 /* Return the current architecture's gdbarch_tdep structure. */
93 #define TDEP gdbarch_tdep (current_gdbarch)
95 /* Breakpoint shadows for the single step instructions will be kept here. */
97 static struct sstep_breaks
99 /* Address, or 0 if this is not in use. */
101 /* Shadow contents. */
106 /* Hook for determining the TOC address when calling functions in the
107 inferior under AIX. The initialization code in rs6000-nat.c sets
108 this hook to point to find_toc_address. */
110 CORE_ADDR (*rs6000_find_toc_address_hook
) (CORE_ADDR
) = NULL
;
112 /* Hook to set the current architecture when starting a child process.
113 rs6000-nat.c sets this. */
115 void (*rs6000_set_host_arch_hook
) (int) = NULL
;
117 /* Static function prototypes */
119 static CORE_ADDR
branch_dest (int opcode
, int instr
, CORE_ADDR pc
,
121 static CORE_ADDR
skip_prologue (CORE_ADDR
, CORE_ADDR
,
122 struct rs6000_framedata
*);
123 static void frame_get_saved_regs (struct frame_info
* fi
,
124 struct rs6000_framedata
* fdatap
);
125 static CORE_ADDR
frame_initial_stack_address (struct frame_info
*);
127 /* Read a LEN-byte address from debugged memory address MEMADDR. */
130 read_memory_addr (CORE_ADDR memaddr
, int len
)
132 return read_memory_unsigned_integer (memaddr
, len
);
136 rs6000_skip_prologue (CORE_ADDR pc
)
138 struct rs6000_framedata frame
;
139 pc
= skip_prologue (pc
, 0, &frame
);
144 /* Fill in fi->saved_regs */
146 struct frame_extra_info
148 /* Functions calling alloca() change the value of the stack
149 pointer. We need to use initial stack pointer (which is saved in
150 r31 by gcc) in such cases. If a compiler emits traceback table,
151 then we should use the alloca register specified in traceback
153 CORE_ADDR initial_sp
; /* initial stack pointer. */
157 rs6000_init_extra_frame_info (int fromleaf
, struct frame_info
*fi
)
159 fi
->extra_info
= (struct frame_extra_info
*)
160 frame_obstack_alloc (sizeof (struct frame_extra_info
));
161 fi
->extra_info
->initial_sp
= 0;
162 if (fi
->next
!= (CORE_ADDR
) 0
163 && fi
->pc
< TEXT_SEGMENT_BASE
)
164 /* We're in get_prev_frame */
165 /* and this is a special signal frame. */
166 /* (fi->pc will be some low address in the kernel, */
167 /* to which the signal handler returns). */
168 fi
->signal_handler_caller
= 1;
171 /* Put here the code to store, into a struct frame_saved_regs,
172 the addresses of the saved registers of frame described by FRAME_INFO.
173 This includes special registers such as pc and fp saved in special
174 ways in the stack frame. sp is even more special:
175 the address we return for it IS the sp for the next frame. */
177 /* In this implementation for RS/6000, we do *not* save sp. I am
178 not sure if it will be needed. The following function takes care of gpr's
182 rs6000_frame_init_saved_regs (struct frame_info
*fi
)
184 frame_get_saved_regs (fi
, NULL
);
188 rs6000_frame_args_address (struct frame_info
*fi
)
190 if (fi
->extra_info
->initial_sp
!= 0)
191 return fi
->extra_info
->initial_sp
;
193 return frame_initial_stack_address (fi
);
196 /* Immediately after a function call, return the saved pc.
197 Can't go through the frames for this because on some machines
198 the new frame is not set up until the new function executes
199 some instructions. */
202 rs6000_saved_pc_after_call (struct frame_info
*fi
)
204 return read_register (PPC_LR_REGNUM
);
207 /* Calculate the destination of a branch/jump. Return -1 if not a branch. */
210 branch_dest (int opcode
, int instr
, CORE_ADDR pc
, CORE_ADDR safety
)
217 absolute
= (int) ((instr
>> 1) & 1);
222 immediate
= ((instr
& ~3) << 6) >> 6; /* br unconditional */
226 dest
= pc
+ immediate
;
230 immediate
= ((instr
& ~3) << 16) >> 16; /* br conditional */
234 dest
= pc
+ immediate
;
238 ext_op
= (instr
>> 1) & 0x3ff;
240 if (ext_op
== 16) /* br conditional register */
242 dest
= read_register (PPC_LR_REGNUM
) & ~3;
244 /* If we are about to return from a signal handler, dest is
245 something like 0x3c90. The current frame is a signal handler
246 caller frame, upon completion of the sigreturn system call
247 execution will return to the saved PC in the frame. */
248 if (dest
< TEXT_SEGMENT_BASE
)
250 struct frame_info
*fi
;
252 fi
= get_current_frame ();
254 dest
= read_memory_addr (fi
->frame
+ SIG_FRAME_PC_OFFSET
,
259 else if (ext_op
== 528) /* br cond to count reg */
261 dest
= read_register (PPC_CTR_REGNUM
) & ~3;
263 /* If we are about to execute a system call, dest is something
264 like 0x22fc or 0x3b00. Upon completion the system call
265 will return to the address in the link register. */
266 if (dest
< TEXT_SEGMENT_BASE
)
267 dest
= read_register (PPC_LR_REGNUM
) & ~3;
276 return (dest
< TEXT_SEGMENT_BASE
) ? safety
: dest
;
280 /* Sequence of bytes for breakpoint instruction. */
282 #define BIG_BREAKPOINT { 0x7d, 0x82, 0x10, 0x08 }
283 #define LITTLE_BREAKPOINT { 0x08, 0x10, 0x82, 0x7d }
285 static unsigned char *
286 rs6000_breakpoint_from_pc (CORE_ADDR
*bp_addr
, int *bp_size
)
288 static unsigned char big_breakpoint
[] = BIG_BREAKPOINT
;
289 static unsigned char little_breakpoint
[] = LITTLE_BREAKPOINT
;
291 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
)
292 return big_breakpoint
;
294 return little_breakpoint
;
298 /* AIX does not support PT_STEP. Simulate it. */
301 rs6000_software_single_step (unsigned int signal
, int insert_breakpoints_p
)
303 #define INSNLEN(OPCODE) 4
305 static char le_breakp
[] = LITTLE_BREAKPOINT
;
306 static char be_breakp
[] = BIG_BREAKPOINT
;
307 char *breakp
= TARGET_BYTE_ORDER
== BIG_ENDIAN
? be_breakp
: le_breakp
;
313 if (insert_breakpoints_p
)
318 insn
= read_memory_integer (loc
, 4);
320 breaks
[0] = loc
+ INSNLEN (insn
);
322 breaks
[1] = branch_dest (opcode
, insn
, loc
, breaks
[0]);
324 /* Don't put two breakpoints on the same address. */
325 if (breaks
[1] == breaks
[0])
328 stepBreaks
[1].address
= 0;
330 for (ii
= 0; ii
< 2; ++ii
)
333 /* ignore invalid breakpoint. */
334 if (breaks
[ii
] == -1)
337 read_memory (breaks
[ii
], stepBreaks
[ii
].data
, 4);
339 write_memory (breaks
[ii
], breakp
, 4);
340 stepBreaks
[ii
].address
= breaks
[ii
];
347 /* remove step breakpoints. */
348 for (ii
= 0; ii
< 2; ++ii
)
349 if (stepBreaks
[ii
].address
!= 0)
351 (stepBreaks
[ii
].address
, stepBreaks
[ii
].data
, 4);
354 errno
= 0; /* FIXME, don't ignore errors! */
355 /* What errors? {read,write}_memory call error(). */
359 /* return pc value after skipping a function prologue and also return
360 information about a function frame.
362 in struct rs6000_framedata fdata:
363 - frameless is TRUE, if function does not have a frame.
364 - nosavedpc is TRUE, if function does not save %pc value in its frame.
365 - offset is the initial size of this stack frame --- the amount by
366 which we decrement the sp to allocate the frame.
367 - saved_gpr is the number of the first saved gpr.
368 - saved_fpr is the number of the first saved fpr.
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 - lr_offset is the offset of the saved lr
374 - cr_offset is the offset of the saved cr
377 #define SIGNED_SHORT(x) \
378 ((sizeof (short) == 2) \
379 ? ((int)(short)(x)) \
380 : ((int)((((x) & 0xffff) ^ 0x8000) - 0x8000)))
382 #define GET_SRC_REG(x) (((x) >> 21) & 0x1f)
384 /* Limit the number of skipped non-prologue instructions, as the examining
385 of the prologue is expensive. */
386 static int max_skip_non_prologue_insns
= 10;
388 /* Given PC representing the starting address of a function, and
389 LIM_PC which is the (sloppy) limit to which to scan when looking
390 for a prologue, attempt to further refine this limit by using
391 the line data in the symbol table. If successful, a better guess
392 on where the prologue ends is returned, otherwise the previous
393 value of lim_pc is returned. */
395 refine_prologue_limit (CORE_ADDR pc
, CORE_ADDR lim_pc
)
397 struct symtab_and_line prologue_sal
;
399 prologue_sal
= find_pc_line (pc
, 0);
400 if (prologue_sal
.line
!= 0)
403 CORE_ADDR addr
= prologue_sal
.end
;
405 /* Handle the case in which compiler's optimizer/scheduler
406 has moved instructions into the prologue. We scan ahead
407 in the function looking for address ranges whose corresponding
408 line number is less than or equal to the first one that we
409 found for the function. (It can be less than when the
410 scheduler puts a body instruction before the first prologue
412 for (i
= 2 * max_skip_non_prologue_insns
;
413 i
> 0 && (lim_pc
== 0 || addr
< lim_pc
);
416 struct symtab_and_line sal
;
418 sal
= find_pc_line (addr
, 0);
421 if (sal
.line
<= prologue_sal
.line
422 && sal
.symtab
== prologue_sal
.symtab
)
429 if (lim_pc
== 0 || prologue_sal
.end
< lim_pc
)
430 lim_pc
= prologue_sal
.end
;
437 skip_prologue (CORE_ADDR pc
, CORE_ADDR lim_pc
, struct rs6000_framedata
*fdata
)
439 CORE_ADDR orig_pc
= pc
;
440 CORE_ADDR last_prologue_pc
= pc
;
448 int minimal_toc_loaded
= 0;
449 int prev_insn_was_prologue_insn
= 1;
450 int num_skip_non_prologue_insns
= 0;
452 /* Attempt to find the end of the prologue when no limit is specified.
453 Note that refine_prologue_limit() has been written so that it may
454 be used to "refine" the limits of non-zero PC values too, but this
455 is only safe if we 1) trust the line information provided by the
456 compiler and 2) iterate enough to actually find the end of the
459 It may become a good idea at some point (for both performance and
460 accuracy) to unconditionally call refine_prologue_limit(). But,
461 until we can make a clear determination that this is beneficial,
462 we'll play it safe and only use it to obtain a limit when none
463 has been specified. */
465 lim_pc
= refine_prologue_limit (pc
, lim_pc
);
467 memset (fdata
, 0, sizeof (struct rs6000_framedata
));
468 fdata
->saved_gpr
= -1;
469 fdata
->saved_fpr
= -1;
470 fdata
->alloca_reg
= -1;
471 fdata
->frameless
= 1;
472 fdata
->nosavedpc
= 1;
476 /* Sometimes it isn't clear if an instruction is a prologue
477 instruction or not. When we encounter one of these ambiguous
478 cases, we'll set prev_insn_was_prologue_insn to 0 (false).
479 Otherwise, we'll assume that it really is a prologue instruction. */
480 if (prev_insn_was_prologue_insn
)
481 last_prologue_pc
= pc
;
483 /* Stop scanning if we've hit the limit. */
484 if (lim_pc
!= 0 && pc
>= lim_pc
)
487 prev_insn_was_prologue_insn
= 1;
489 /* Fetch the instruction and convert it to an integer. */
490 if (target_read_memory (pc
, buf
, 4))
492 op
= extract_signed_integer (buf
, 4);
494 if ((op
& 0xfc1fffff) == 0x7c0802a6)
496 lr_reg
= (op
& 0x03e00000) | 0x90010000;
500 else if ((op
& 0xfc1fffff) == 0x7c000026)
502 cr_reg
= (op
& 0x03e00000) | 0x90010000;
506 else if ((op
& 0xfc1f0000) == 0xd8010000)
507 { /* stfd Rx,NUM(r1) */
508 reg
= GET_SRC_REG (op
);
509 if (fdata
->saved_fpr
== -1 || fdata
->saved_fpr
> reg
)
511 fdata
->saved_fpr
= reg
;
512 fdata
->fpr_offset
= SIGNED_SHORT (op
) + offset
;
517 else if (((op
& 0xfc1f0000) == 0xbc010000) || /* stm Rx, NUM(r1) */
518 (((op
& 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
519 (op
& 0xfc1f0003) == 0xf8010000) && /* std rx,NUM(r1) */
520 (op
& 0x03e00000) >= 0x01a00000)) /* rx >= r13 */
523 reg
= GET_SRC_REG (op
);
524 if (fdata
->saved_gpr
== -1 || fdata
->saved_gpr
> reg
)
526 fdata
->saved_gpr
= reg
;
527 if ((op
& 0xfc1f0003) == 0xf8010000)
529 fdata
->gpr_offset
= SIGNED_SHORT (op
) + offset
;
534 else if ((op
& 0xffff0000) == 0x60000000)
537 /* Allow nops in the prologue, but do not consider them to
538 be part of the prologue unless followed by other prologue
540 prev_insn_was_prologue_insn
= 0;
544 else if ((op
& 0xffff0000) == 0x3c000000)
545 { /* addis 0,0,NUM, used
547 fdata
->offset
= (op
& 0x0000ffff) << 16;
548 fdata
->frameless
= 0;
552 else if ((op
& 0xffff0000) == 0x60000000)
553 { /* ori 0,0,NUM, 2nd ha
554 lf of >= 32k frames */
555 fdata
->offset
|= (op
& 0x0000ffff);
556 fdata
->frameless
= 0;
560 else if (lr_reg
!= -1 && (op
& 0xffff0000) == lr_reg
)
563 fdata
->lr_offset
= SIGNED_SHORT (op
) + offset
;
564 fdata
->nosavedpc
= 0;
569 else if (cr_reg
!= -1 && (op
& 0xffff0000) == cr_reg
)
572 fdata
->cr_offset
= SIGNED_SHORT (op
) + offset
;
577 else if (op
== 0x48000005)
583 else if (op
== 0x48000004)
588 else if (((op
& 0xffff0000) == 0x801e0000 || /* lwz 0,NUM(r30), used
589 in V.4 -mrelocatable */
590 op
== 0x7fc0f214) && /* add r30,r0,r30, used
591 in V.4 -mrelocatable */
592 lr_reg
== 0x901e0000)
597 else if ((op
& 0xffff0000) == 0x3fc00000 || /* addis 30,0,foo@ha, used
598 in V.4 -mminimal-toc */
599 (op
& 0xffff0000) == 0x3bde0000)
600 { /* addi 30,30,foo@l */
604 else if ((op
& 0xfc000001) == 0x48000001)
608 fdata
->frameless
= 0;
609 /* Don't skip over the subroutine call if it is not within the first
610 three instructions of the prologue. */
611 if ((pc
- orig_pc
) > 8)
614 op
= read_memory_integer (pc
+ 4, 4);
616 /* At this point, make sure this is not a trampoline function
617 (a function that simply calls another functions, and nothing else).
618 If the next is not a nop, this branch was part of the function
621 if (op
== 0x4def7b82 || op
== 0) /* crorc 15, 15, 15 */
622 break; /* don't skip over
626 /* update stack pointer */
628 else if ((op
& 0xffff0000) == 0x94210000 || /* stu r1,NUM(r1) */
629 (op
& 0xffff0003) == 0xf8210001) /* stdu r1,NUM(r1) */
631 fdata
->frameless
= 0;
632 if ((op
& 0xffff0003) == 0xf8210001)
634 fdata
->offset
= SIGNED_SHORT (op
);
635 offset
= fdata
->offset
;
639 else if (op
== 0x7c21016e)
641 fdata
->frameless
= 0;
642 offset
= fdata
->offset
;
645 /* Load up minimal toc pointer */
647 else if ((op
>> 22) == 0x20f
648 && !minimal_toc_loaded
)
649 { /* l r31,... or l r30,... */
650 minimal_toc_loaded
= 1;
653 /* move parameters from argument registers to local variable
656 else if ((op
& 0xfc0007fe) == 0x7c000378 && /* mr(.) Rx,Ry */
657 (((op
>> 21) & 31) >= 3) && /* R3 >= Ry >= R10 */
658 (((op
>> 21) & 31) <= 10) &&
659 (((op
>> 16) & 31) >= fdata
->saved_gpr
)) /* Rx: local var reg */
663 /* store parameters in stack */
665 else if ((op
& 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
666 (op
& 0xfc1f0003) == 0xf8010000 || /* std rx,NUM(r1) */
667 (op
& 0xfc1f0000) == 0xd8010000 || /* stfd Rx,NUM(r1) */
668 (op
& 0xfc1f0000) == 0xfc010000) /* frsp, fp?,NUM(r1) */
672 /* store parameters in stack via frame pointer */
675 ((op
& 0xfc1f0000) == 0x901f0000 || /* st rx,NUM(r1) */
676 (op
& 0xfc1f0000) == 0xd81f0000 || /* stfd Rx,NUM(r1) */
677 (op
& 0xfc1f0000) == 0xfc1f0000))
678 { /* frsp, fp?,NUM(r1) */
681 /* Set up frame pointer */
683 else if (op
== 0x603f0000 /* oril r31, r1, 0x0 */
686 fdata
->frameless
= 0;
688 fdata
->alloca_reg
= 31;
691 /* Another way to set up the frame pointer. */
693 else if ((op
& 0xfc1fffff) == 0x38010000)
694 { /* addi rX, r1, 0x0 */
695 fdata
->frameless
= 0;
697 fdata
->alloca_reg
= (op
& ~0x38010000) >> 21;
703 /* Not a recognized prologue instruction.
704 Handle optimizer code motions into the prologue by continuing
705 the search if we have no valid frame yet or if the return
706 address is not yet saved in the frame. */
707 if (fdata
->frameless
== 0
708 && (lr_reg
== -1 || fdata
->nosavedpc
== 0))
711 if (op
== 0x4e800020 /* blr */
712 || op
== 0x4e800420) /* bctr */
713 /* Do not scan past epilogue in frameless functions or
716 if ((op
& 0xf4000000) == 0x40000000) /* bxx */
717 /* Never skip branches. */
720 if (num_skip_non_prologue_insns
++ > max_skip_non_prologue_insns
)
721 /* Do not scan too many insns, scanning insns is expensive with
725 /* Continue scanning. */
726 prev_insn_was_prologue_insn
= 0;
732 /* I have problems with skipping over __main() that I need to address
733 * sometime. Previously, I used to use misc_function_vector which
734 * didn't work as well as I wanted to be. -MGO */
736 /* If the first thing after skipping a prolog is a branch to a function,
737 this might be a call to an initializer in main(), introduced by gcc2.
738 We'd like to skip over it as well. Fortunately, xlc does some extra
739 work before calling a function right after a prologue, thus we can
740 single out such gcc2 behaviour. */
743 if ((op
& 0xfc000001) == 0x48000001)
744 { /* bl foo, an initializer function? */
745 op
= read_memory_integer (pc
+ 4, 4);
747 if (op
== 0x4def7b82)
748 { /* cror 0xf, 0xf, 0xf (nop) */
750 /* check and see if we are in main. If so, skip over this initializer
753 tmp
= find_pc_misc_function (pc
);
754 if (tmp
>= 0 && STREQ (misc_function_vector
[tmp
].name
, "main"))
760 fdata
->offset
= -fdata
->offset
;
761 return last_prologue_pc
;
765 /*************************************************************************
766 Support for creating pushing a dummy frame into the stack, and popping
768 *************************************************************************/
771 /* Pop the innermost frame, go back to the caller. */
774 rs6000_pop_frame (void)
776 CORE_ADDR pc
, lr
, sp
, prev_sp
, addr
; /* %pc, %lr, %sp */
777 struct rs6000_framedata fdata
;
778 struct frame_info
*frame
= get_current_frame ();
782 sp
= FRAME_FP (frame
);
784 if (PC_IN_CALL_DUMMY (frame
->pc
, frame
->frame
, frame
->frame
))
786 generic_pop_dummy_frame ();
787 flush_cached_frames ();
791 /* Make sure that all registers are valid. */
792 read_register_bytes (0, NULL
, REGISTER_BYTES
);
794 /* figure out previous %pc value. If the function is frameless, it is
795 still in the link register, otherwise walk the frames and retrieve the
796 saved %pc value in the previous frame. */
798 addr
= get_pc_function_start (frame
->pc
);
799 (void) skip_prologue (addr
, frame
->pc
, &fdata
);
801 wordsize
= TDEP
->wordsize
;
805 prev_sp
= read_memory_addr (sp
, wordsize
);
806 if (fdata
.lr_offset
== 0)
807 lr
= read_register (PPC_LR_REGNUM
);
809 lr
= read_memory_addr (prev_sp
+ fdata
.lr_offset
, wordsize
);
811 /* reset %pc value. */
812 write_register (PC_REGNUM
, lr
);
814 /* reset register values if any was saved earlier. */
816 if (fdata
.saved_gpr
!= -1)
818 addr
= prev_sp
+ fdata
.gpr_offset
;
819 for (ii
= fdata
.saved_gpr
; ii
<= 31; ++ii
)
821 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
)], wordsize
);
826 if (fdata
.saved_fpr
!= -1)
828 addr
= prev_sp
+ fdata
.fpr_offset
;
829 for (ii
= fdata
.saved_fpr
; ii
<= 31; ++ii
)
831 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
+ FP0_REGNUM
)], 8);
836 write_register (SP_REGNUM
, prev_sp
);
837 target_store_registers (-1);
838 flush_cached_frames ();
841 /* Fixup the call sequence of a dummy function, with the real function
842 address. Its arguments will be passed by gdb. */
845 rs6000_fix_call_dummy (char *dummyname
, CORE_ADDR pc
, CORE_ADDR fun
,
846 int nargs
, value_ptr
*args
, struct type
*type
,
849 #define TOC_ADDR_OFFSET 20
850 #define TARGET_ADDR_OFFSET 28
853 CORE_ADDR target_addr
;
855 if (rs6000_find_toc_address_hook
!= NULL
)
857 CORE_ADDR tocvalue
= (*rs6000_find_toc_address_hook
) (fun
);
858 write_register (PPC_TOC_REGNUM
, tocvalue
);
862 /* Pass the arguments in either registers, or in the stack. In RS/6000,
863 the first eight words of the argument list (that might be less than
864 eight parameters if some parameters occupy more than one word) are
865 passed in r3..r10 registers. float and double parameters are
866 passed in fpr's, in addition to that. Rest of the parameters if any
867 are passed in user stack. There might be cases in which half of the
868 parameter is copied into registers, the other half is pushed into
871 Stack must be aligned on 64-bit boundaries when synthesizing
874 If the function is returning a structure, then the return address is passed
875 in r3, then the first 7 words of the parameters can be passed in registers,
879 rs6000_push_arguments (int nargs
, value_ptr
*args
, CORE_ADDR sp
,
880 int struct_return
, CORE_ADDR struct_addr
)
884 int argno
; /* current argument number */
885 int argbytes
; /* current argument byte */
887 int f_argno
= 0; /* current floating point argno */
888 int wordsize
= TDEP
->wordsize
;
895 /* The first eight words of ther arguments are passed in registers. Copy
898 If the function is returning a `struct', then the first word (which
899 will be passed in r3) is used for struct return address. In that
900 case we should advance one word and start from r4 register to copy
903 ii
= struct_return
? 1 : 0;
906 effectively indirect call... gcc does...
908 return_val example( float, int);
911 float in fp0, int in r3
912 offset of stack on overflow 8/16
913 for varargs, must go by type.
915 float in r3&r4, int in r5
916 offset of stack on overflow different
918 return in r3 or f0. If no float, must study how gcc emulates floats;
919 pay attention to arg promotion.
920 User may have to cast\args to handle promotion correctly
921 since gdb won't know if prototype supplied or not.
924 for (argno
= 0, argbytes
= 0; argno
< nargs
&& ii
< 8; ++ii
)
926 int reg_size
= REGISTER_RAW_SIZE (ii
+ 3);
929 type
= check_typedef (VALUE_TYPE (arg
));
930 len
= TYPE_LENGTH (type
);
932 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
935 /* floating point arguments are passed in fpr's, as well as gpr's.
936 There are 13 fpr's reserved for passing parameters. At this point
937 there is no way we would run out of them. */
941 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
943 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
+ 1 + f_argno
)],
944 VALUE_CONTENTS (arg
),
952 /* Argument takes more than one register. */
953 while (argbytes
< len
)
955 memset (®isters
[REGISTER_BYTE (ii
+ 3)], 0, reg_size
);
956 memcpy (®isters
[REGISTER_BYTE (ii
+ 3)],
957 ((char *) VALUE_CONTENTS (arg
)) + argbytes
,
958 (len
- argbytes
) > reg_size
959 ? reg_size
: len
- argbytes
);
960 ++ii
, argbytes
+= reg_size
;
963 goto ran_out_of_registers_for_arguments
;
969 { /* Argument can fit in one register. No problem. */
970 int adj
= TARGET_BYTE_ORDER
== BIG_ENDIAN
? reg_size
- len
: 0;
971 memset (®isters
[REGISTER_BYTE (ii
+ 3)], 0, reg_size
);
972 memcpy ((char *)®isters
[REGISTER_BYTE (ii
+ 3)] + adj
,
973 VALUE_CONTENTS (arg
), len
);
978 ran_out_of_registers_for_arguments
:
980 saved_sp
= read_sp ();
981 #ifndef ELF_OBJECT_FORMAT
982 /* location for 8 parameters are always reserved. */
985 /* another six words for back chain, TOC register, link register, etc. */
988 /* stack pointer must be quadword aligned */
992 /* if there are more arguments, allocate space for them in
993 the stack, then push them starting from the ninth one. */
995 if ((argno
< nargs
) || argbytes
)
1001 space
+= ((len
- argbytes
+ 3) & -4);
1007 for (; jj
< nargs
; ++jj
)
1009 value_ptr val
= args
[jj
];
1010 space
+= ((TYPE_LENGTH (VALUE_TYPE (val
))) + 3) & -4;
1013 /* add location required for the rest of the parameters */
1014 space
= (space
+ 15) & -16;
1017 /* This is another instance we need to be concerned about securing our
1018 stack space. If we write anything underneath %sp (r1), we might conflict
1019 with the kernel who thinks he is free to use this area. So, update %sp
1020 first before doing anything else. */
1022 write_register (SP_REGNUM
, sp
);
1024 /* if the last argument copied into the registers didn't fit there
1025 completely, push the rest of it into stack. */
1029 write_memory (sp
+ 24 + (ii
* 4),
1030 ((char *) VALUE_CONTENTS (arg
)) + argbytes
,
1033 ii
+= ((len
- argbytes
+ 3) & -4) / 4;
1036 /* push the rest of the arguments into stack. */
1037 for (; argno
< nargs
; ++argno
)
1041 type
= check_typedef (VALUE_TYPE (arg
));
1042 len
= TYPE_LENGTH (type
);
1045 /* float types should be passed in fpr's, as well as in the stack. */
1046 if (TYPE_CODE (type
) == TYPE_CODE_FLT
&& f_argno
< 13)
1051 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
1053 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
+ 1 + f_argno
)],
1054 VALUE_CONTENTS (arg
),
1059 write_memory (sp
+ 24 + (ii
* 4), (char *) VALUE_CONTENTS (arg
), len
);
1060 ii
+= ((len
+ 3) & -4) / 4;
1064 /* Secure stack areas first, before doing anything else. */
1065 write_register (SP_REGNUM
, sp
);
1067 /* set back chain properly */
1068 store_address (tmp_buffer
, 4, saved_sp
);
1069 write_memory (sp
, tmp_buffer
, 4);
1071 target_store_registers (-1);
1075 /* Function: ppc_push_return_address (pc, sp)
1076 Set up the return address for the inferior function call. */
1079 ppc_push_return_address (CORE_ADDR pc
, CORE_ADDR sp
)
1081 write_register (PPC_LR_REGNUM
, CALL_DUMMY_ADDRESS ());
1085 /* Extract a function return value of type TYPE from raw register array
1086 REGBUF, and copy that return value into VALBUF in virtual format. */
1089 rs6000_extract_return_value (struct type
*valtype
, char *regbuf
, char *valbuf
)
1093 if (TYPE_CODE (valtype
) == TYPE_CODE_FLT
)
1098 /* floats and doubles are returned in fpr1. fpr's have a size of 8 bytes.
1099 We need to truncate the return value into float size (4 byte) if
1102 if (TYPE_LENGTH (valtype
) > 4) /* this is a double */
1104 ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)],
1105 TYPE_LENGTH (valtype
));
1108 memcpy (&dd
, ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)], 8);
1110 memcpy (valbuf
, &ff
, sizeof (float));
1115 /* return value is copied starting from r3. */
1116 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
1117 && TYPE_LENGTH (valtype
) < REGISTER_RAW_SIZE (3))
1118 offset
= REGISTER_RAW_SIZE (3) - TYPE_LENGTH (valtype
);
1121 regbuf
+ REGISTER_BYTE (3) + offset
,
1122 TYPE_LENGTH (valtype
));
1126 /* Keep structure return address in this variable.
1127 FIXME: This is a horrid kludge which should not be allowed to continue
1128 living. This only allows a single nested call to a structure-returning
1129 function. Come on, guys! -- gnu@cygnus.com, Aug 92 */
1131 static CORE_ADDR rs6000_struct_return_address
;
1133 /* Indirect function calls use a piece of trampoline code to do context
1134 switching, i.e. to set the new TOC table. Skip such code if we are on
1135 its first instruction (as when we have single-stepped to here).
1136 Also skip shared library trampoline code (which is different from
1137 indirect function call trampolines).
1138 Result is desired PC to step until, or NULL if we are not in
1142 rs6000_skip_trampoline_code (CORE_ADDR pc
)
1144 register unsigned int ii
, op
;
1145 CORE_ADDR solib_target_pc
;
1147 static unsigned trampoline_code
[] =
1149 0x800b0000, /* l r0,0x0(r11) */
1150 0x90410014, /* st r2,0x14(r1) */
1151 0x7c0903a6, /* mtctr r0 */
1152 0x804b0004, /* l r2,0x4(r11) */
1153 0x816b0008, /* l r11,0x8(r11) */
1154 0x4e800420, /* bctr */
1155 0x4e800020, /* br */
1159 /* If pc is in a shared library trampoline, return its target. */
1160 solib_target_pc
= find_solib_trampoline_target (pc
);
1161 if (solib_target_pc
)
1162 return solib_target_pc
;
1164 for (ii
= 0; trampoline_code
[ii
]; ++ii
)
1166 op
= read_memory_integer (pc
+ (ii
* 4), 4);
1167 if (op
!= trampoline_code
[ii
])
1170 ii
= read_register (11); /* r11 holds destination addr */
1171 pc
= read_memory_addr (ii
, TDEP
->wordsize
); /* (r11) value */
1175 /* Determines whether the function FI has a frame on the stack or not. */
1178 rs6000_frameless_function_invocation (struct frame_info
*fi
)
1180 CORE_ADDR func_start
;
1181 struct rs6000_framedata fdata
;
1183 /* Don't even think about framelessness except on the innermost frame
1184 or if the function was interrupted by a signal. */
1185 if (fi
->next
!= NULL
&& !fi
->next
->signal_handler_caller
)
1188 func_start
= get_pc_function_start (fi
->pc
);
1190 /* If we failed to find the start of the function, it is a mistake
1191 to inspect the instructions. */
1195 /* A frame with a zero PC is usually created by dereferencing a NULL
1196 function pointer, normally causing an immediate core dump of the
1197 inferior. Mark function as frameless, as the inferior has no chance
1198 of setting up a stack frame. */
1205 (void) skip_prologue (func_start
, fi
->pc
, &fdata
);
1206 return fdata
.frameless
;
1209 /* Return the PC saved in a frame */
1212 rs6000_frame_saved_pc (struct frame_info
*fi
)
1214 CORE_ADDR func_start
;
1215 struct rs6000_framedata fdata
;
1216 int wordsize
= TDEP
->wordsize
;
1218 if (fi
->signal_handler_caller
)
1219 return read_memory_addr (fi
->frame
+ SIG_FRAME_PC_OFFSET
, wordsize
);
1221 if (PC_IN_CALL_DUMMY (fi
->pc
, fi
->frame
, fi
->frame
))
1222 return generic_read_register_dummy (fi
->pc
, fi
->frame
, PC_REGNUM
);
1224 func_start
= get_pc_function_start (fi
->pc
);
1226 /* If we failed to find the start of the function, it is a mistake
1227 to inspect the instructions. */
1231 (void) skip_prologue (func_start
, fi
->pc
, &fdata
);
1233 if (fdata
.lr_offset
== 0 && fi
->next
!= NULL
)
1235 if (fi
->next
->signal_handler_caller
)
1236 return read_memory_addr (fi
->next
->frame
+ SIG_FRAME_LR_OFFSET
,
1239 return read_memory_addr (FRAME_CHAIN (fi
) + DEFAULT_LR_SAVE
,
1243 if (fdata
.lr_offset
== 0)
1244 return read_register (PPC_LR_REGNUM
);
1246 return read_memory_addr (FRAME_CHAIN (fi
) + fdata
.lr_offset
, wordsize
);
1249 /* If saved registers of frame FI are not known yet, read and cache them.
1250 &FDATAP contains rs6000_framedata; TDATAP can be NULL,
1251 in which case the framedata are read. */
1254 frame_get_saved_regs (struct frame_info
*fi
, struct rs6000_framedata
*fdatap
)
1256 CORE_ADDR frame_addr
;
1257 struct rs6000_framedata work_fdata
;
1258 int wordsize
= TDEP
->wordsize
;
1265 fdatap
= &work_fdata
;
1266 (void) skip_prologue (get_pc_function_start (fi
->pc
), fi
->pc
, fdatap
);
1269 frame_saved_regs_zalloc (fi
);
1271 /* If there were any saved registers, figure out parent's stack
1273 /* The following is true only if the frame doesn't have a call to
1276 if (fdatap
->saved_fpr
== 0 && fdatap
->saved_gpr
== 0
1277 && fdatap
->lr_offset
== 0 && fdatap
->cr_offset
== 0)
1279 else if (fi
->prev
&& fi
->prev
->frame
)
1280 frame_addr
= fi
->prev
->frame
;
1282 frame_addr
= read_memory_addr (fi
->frame
, wordsize
);
1284 /* if != -1, fdatap->saved_fpr is the smallest number of saved_fpr.
1285 All fpr's from saved_fpr to fp31 are saved. */
1287 if (fdatap
->saved_fpr
>= 0)
1290 CORE_ADDR fpr_addr
= frame_addr
+ fdatap
->fpr_offset
;
1291 for (i
= fdatap
->saved_fpr
; i
< 32; i
++)
1293 fi
->saved_regs
[FP0_REGNUM
+ i
] = fpr_addr
;
1298 /* if != -1, fdatap->saved_gpr is the smallest number of saved_gpr.
1299 All gpr's from saved_gpr to gpr31 are saved. */
1301 if (fdatap
->saved_gpr
>= 0)
1304 CORE_ADDR gpr_addr
= frame_addr
+ fdatap
->gpr_offset
;
1305 for (i
= fdatap
->saved_gpr
; i
< 32; i
++)
1307 fi
->saved_regs
[i
] = gpr_addr
;
1308 gpr_addr
+= wordsize
;
1312 /* If != 0, fdatap->cr_offset is the offset from the frame that holds
1314 if (fdatap
->cr_offset
!= 0)
1315 fi
->saved_regs
[PPC_CR_REGNUM
] = frame_addr
+ fdatap
->cr_offset
;
1317 /* If != 0, fdatap->lr_offset is the offset from the frame that holds
1319 if (fdatap
->lr_offset
!= 0)
1320 fi
->saved_regs
[PPC_LR_REGNUM
] = frame_addr
+ fdatap
->lr_offset
;
1323 /* Return the address of a frame. This is the inital %sp value when the frame
1324 was first allocated. For functions calling alloca(), it might be saved in
1325 an alloca register. */
1328 frame_initial_stack_address (struct frame_info
*fi
)
1331 struct rs6000_framedata fdata
;
1332 struct frame_info
*callee_fi
;
1334 /* if the initial stack pointer (frame address) of this frame is known,
1337 if (fi
->extra_info
->initial_sp
)
1338 return fi
->extra_info
->initial_sp
;
1340 /* find out if this function is using an alloca register.. */
1342 (void) skip_prologue (get_pc_function_start (fi
->pc
), fi
->pc
, &fdata
);
1344 /* if saved registers of this frame are not known yet, read and cache them. */
1346 if (!fi
->saved_regs
)
1347 frame_get_saved_regs (fi
, &fdata
);
1349 /* If no alloca register used, then fi->frame is the value of the %sp for
1350 this frame, and it is good enough. */
1352 if (fdata
.alloca_reg
< 0)
1354 fi
->extra_info
->initial_sp
= fi
->frame
;
1355 return fi
->extra_info
->initial_sp
;
1358 /* This function has an alloca register. If this is the top-most frame
1359 (with the lowest address), the value in alloca register is good. */
1362 return fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1364 /* Otherwise, this is a caller frame. Callee has usually already saved
1365 registers, but there are exceptions (such as when the callee
1366 has no parameters). Find the address in which caller's alloca
1367 register is saved. */
1369 for (callee_fi
= fi
->next
; callee_fi
; callee_fi
= callee_fi
->next
)
1372 if (!callee_fi
->saved_regs
)
1373 frame_get_saved_regs (callee_fi
, NULL
);
1375 /* this is the address in which alloca register is saved. */
1377 tmpaddr
= callee_fi
->saved_regs
[fdata
.alloca_reg
];
1380 fi
->extra_info
->initial_sp
=
1381 read_memory_addr (tmpaddr
, TDEP
->wordsize
);
1382 return fi
->extra_info
->initial_sp
;
1385 /* Go look into deeper levels of the frame chain to see if any one of
1386 the callees has saved alloca register. */
1389 /* If alloca register was not saved, by the callee (or any of its callees)
1390 then the value in the register is still good. */
1392 fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1393 return fi
->extra_info
->initial_sp
;
1396 /* Describe the pointer in each stack frame to the previous stack frame
1399 /* FRAME_CHAIN takes a frame's nominal address
1400 and produces the frame's chain-pointer. */
1402 /* In the case of the RS/6000, the frame's nominal address
1403 is the address of a 4-byte word containing the calling frame's address. */
1406 rs6000_frame_chain (struct frame_info
*thisframe
)
1408 CORE_ADDR fp
, fpp
, lr
;
1409 int wordsize
= TDEP
->wordsize
;
1411 if (PC_IN_CALL_DUMMY (thisframe
->pc
, thisframe
->frame
, thisframe
->frame
))
1412 return thisframe
->frame
; /* dummy frame same as caller's frame */
1414 if (inside_entry_file (thisframe
->pc
) ||
1415 thisframe
->pc
== entry_point_address ())
1418 if (thisframe
->signal_handler_caller
)
1419 fp
= read_memory_addr (thisframe
->frame
+ SIG_FRAME_FP_OFFSET
,
1421 else if (thisframe
->next
!= NULL
1422 && thisframe
->next
->signal_handler_caller
1423 && FRAMELESS_FUNCTION_INVOCATION (thisframe
))
1424 /* A frameless function interrupted by a signal did not change the
1426 fp
= FRAME_FP (thisframe
);
1428 fp
= read_memory_addr ((thisframe
)->frame
, wordsize
);
1430 lr
= read_register (PPC_LR_REGNUM
);
1431 if (lr
== entry_point_address ())
1432 if (fp
!= 0 && (fpp
= read_memory_addr (fp
, wordsize
)) != 0)
1433 if (PC_IN_CALL_DUMMY (lr
, fpp
, fpp
))
1439 /* Return the size of register REG when words are WORDSIZE bytes long. If REG
1440 isn't available with that word size, return 0. */
1443 regsize (const struct reg
*reg
, int wordsize
)
1445 return wordsize
== 8 ? reg
->sz64
: reg
->sz32
;
1448 /* Return the name of register number N, or null if no such register exists
1449 in the current architecture. */
1452 rs6000_register_name (int n
)
1454 struct gdbarch_tdep
*tdep
= TDEP
;
1455 const struct reg
*reg
= tdep
->regs
+ n
;
1457 if (!regsize (reg
, tdep
->wordsize
))
1462 /* Index within `registers' of the first byte of the space for
1466 rs6000_register_byte (int n
)
1468 return TDEP
->regoff
[n
];
1471 /* Return the number of bytes of storage in the actual machine representation
1472 for register N if that register is available, else return 0. */
1475 rs6000_register_raw_size (int n
)
1477 struct gdbarch_tdep
*tdep
= TDEP
;
1478 const struct reg
*reg
= tdep
->regs
+ n
;
1479 return regsize (reg
, tdep
->wordsize
);
1482 /* Number of bytes of storage in the program's representation
1486 rs6000_register_virtual_size (int n
)
1488 return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (n
));
1491 /* Return the GDB type object for the "standard" data type
1492 of data in register N. */
1494 static struct type
*
1495 rs6000_register_virtual_type (int n
)
1497 struct gdbarch_tdep
*tdep
= TDEP
;
1498 const struct reg
*reg
= tdep
->regs
+ n
;
1500 return reg
->fpr
? builtin_type_double
:
1501 regsize (reg
, tdep
->wordsize
) == 8 ? builtin_type_int64
:
1505 /* For the PowerPC, it appears that the debug info marks float parameters as
1506 floats regardless of whether the function is prototyped, but the actual
1507 values are always passed in as doubles. Tell gdb to always assume that
1508 floats are passed as doubles and then converted in the callee. */
1511 rs6000_coerce_float_to_double (struct type
*formal
, struct type
*actual
)
1516 /* Return whether register N requires conversion when moving from raw format
1519 The register format for RS/6000 floating point registers is always
1520 double, we need a conversion if the memory format is float. */
1523 rs6000_register_convertible (int n
)
1525 const struct reg
*reg
= TDEP
->regs
+ n
;
1529 /* Convert data from raw format for register N in buffer FROM
1530 to virtual format with type TYPE in buffer TO. */
1533 rs6000_register_convert_to_virtual (int n
, struct type
*type
,
1534 char *from
, char *to
)
1536 if (TYPE_LENGTH (type
) != REGISTER_RAW_SIZE (n
))
1538 double val
= extract_floating (from
, REGISTER_RAW_SIZE (n
));
1539 store_floating (to
, TYPE_LENGTH (type
), val
);
1542 memcpy (to
, from
, REGISTER_RAW_SIZE (n
));
1545 /* Convert data from virtual format with type TYPE in buffer FROM
1546 to raw format for register N in buffer TO. */
1549 rs6000_register_convert_to_raw (struct type
*type
, int n
,
1550 char *from
, char *to
)
1552 if (TYPE_LENGTH (type
) != REGISTER_RAW_SIZE (n
))
1554 double val
= extract_floating (from
, TYPE_LENGTH (type
));
1555 store_floating (to
, REGISTER_RAW_SIZE (n
), val
);
1558 memcpy (to
, from
, REGISTER_RAW_SIZE (n
));
1561 /* Store the address of the place in which to copy the structure the
1562 subroutine will return. This is called from call_function.
1564 In RS/6000, struct return addresses are passed as an extra parameter in r3.
1565 In function return, callee is not responsible of returning this address
1566 back. Since gdb needs to find it, we will store in a designated variable
1567 `rs6000_struct_return_address'. */
1570 rs6000_store_struct_return (CORE_ADDR addr
, CORE_ADDR sp
)
1572 write_register (3, addr
);
1573 rs6000_struct_return_address
= addr
;
1576 /* Write into appropriate registers a function return value
1577 of type TYPE, given in virtual format. */
1580 rs6000_store_return_value (struct type
*type
, char *valbuf
)
1582 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
1584 /* Floating point values are returned starting from FPR1 and up.
1585 Say a double_double_double type could be returned in
1586 FPR1/FPR2/FPR3 triple. */
1588 write_register_bytes (REGISTER_BYTE (FP0_REGNUM
+ 1), valbuf
,
1589 TYPE_LENGTH (type
));
1591 /* Everything else is returned in GPR3 and up. */
1592 write_register_bytes (REGISTER_BYTE (PPC_GP0_REGNUM
+ 3), valbuf
,
1593 TYPE_LENGTH (type
));
1596 /* Extract from an array REGBUF containing the (raw) register state
1597 the address in which a function should return its structure value,
1598 as a CORE_ADDR (or an expression that can be used as one). */
1601 rs6000_extract_struct_value_address (char *regbuf
)
1603 return rs6000_struct_return_address
;
1606 /* Return whether PC is in a dummy function call.
1608 FIXME: This just checks for the end of the stack, which is broken
1609 for things like stepping through gcc nested function stubs. */
1612 rs6000_pc_in_call_dummy (CORE_ADDR pc
, CORE_ADDR sp
, CORE_ADDR fp
)
1614 return sp
< pc
&& pc
< fp
;
1617 /* Hook called when a new child process is started. */
1620 rs6000_create_inferior (int pid
)
1622 if (rs6000_set_host_arch_hook
)
1623 rs6000_set_host_arch_hook (pid
);
1626 /* Support for CONVERT_FROM_FUNC_PTR_ADDR(ADDR).
1628 Usually a function pointer's representation is simply the address
1629 of the function. On the RS/6000 however, a function pointer is
1630 represented by a pointer to a TOC entry. This TOC entry contains
1631 three words, the first word is the address of the function, the
1632 second word is the TOC pointer (r2), and the third word is the
1633 static chain value. Throughout GDB it is currently assumed that a
1634 function pointer contains the address of the function, which is not
1635 easy to fix. In addition, the conversion of a function address to
1636 a function pointer would require allocation of a TOC entry in the
1637 inferior's memory space, with all its drawbacks. To be able to
1638 call C++ virtual methods in the inferior (which are called via
1639 function pointers), find_function_addr uses this function to get the
1640 function address from a function pointer. */
1642 /* Return real function address if ADDR (a function pointer) is in the data
1643 space and is therefore a special function pointer. */
1646 rs6000_convert_from_func_ptr_addr (CORE_ADDR addr
)
1648 struct obj_section
*s
;
1650 s
= find_pc_section (addr
);
1651 if (s
&& s
->the_bfd_section
->flags
& SEC_CODE
)
1654 /* ADDR is in the data space, so it's a special function pointer. */
1655 return read_memory_addr (addr
, TDEP
->wordsize
);
1659 /* Handling the various POWER/PowerPC variants. */
1662 /* The arrays here called registers_MUMBLE hold information about available
1665 For each family of PPC variants, I've tried to isolate out the
1666 common registers and put them up front, so that as long as you get
1667 the general family right, GDB will correctly identify the registers
1668 common to that family. The common register sets are:
1670 For the 60x family: hid0 hid1 iabr dabr pir
1672 For the 505 and 860 family: eie eid nri
1674 For the 403 and 403GC: icdbdr esr dear evpr cdbcr tsr tcr pit tbhi
1675 tblo srr2 srr3 dbsr dbcr iac1 iac2 dac1 dac2 dccr iccr pbl1
1678 Most of these register groups aren't anything formal. I arrived at
1679 them by looking at the registers that occurred in more than one
1682 /* Convenience macros for populating register arrays. */
1684 /* Within another macro, convert S to a string. */
1688 /* Return a struct reg defining register NAME that's 32 bits on 32-bit systems
1689 and 64 bits on 64-bit systems. */
1690 #define R(name) { STR(name), 4, 8, 0 }
1692 /* Return a struct reg defining register NAME that's 32 bits on all
1694 #define R4(name) { STR(name), 4, 4, 0 }
1696 /* Return a struct reg defining register NAME that's 64 bits on all
1698 #define R8(name) { STR(name), 8, 8, 0 }
1700 /* Return a struct reg defining floating-point register NAME. */
1701 #define F(name) { STR(name), 8, 8, 1 }
1703 /* Return a struct reg defining register NAME that's 32 bits on 32-bit
1704 systems and that doesn't exist on 64-bit systems. */
1705 #define R32(name) { STR(name), 4, 0, 0 }
1707 /* Return a struct reg defining register NAME that's 64 bits on 64-bit
1708 systems and that doesn't exist on 32-bit systems. */
1709 #define R64(name) { STR(name), 0, 8, 0 }
1711 /* Return a struct reg placeholder for a register that doesn't exist. */
1712 #define R0 { 0, 0, 0, 0 }
1714 /* UISA registers common across all architectures, including POWER. */
1716 #define COMMON_UISA_REGS \
1717 /* 0 */ R(r0), R(r1), R(r2), R(r3), R(r4), R(r5), R(r6), R(r7), \
1718 /* 8 */ R(r8), R(r9), R(r10),R(r11),R(r12),R(r13),R(r14),R(r15), \
1719 /* 16 */ R(r16),R(r17),R(r18),R(r19),R(r20),R(r21),R(r22),R(r23), \
1720 /* 24 */ R(r24),R(r25),R(r26),R(r27),R(r28),R(r29),R(r30),R(r31), \
1721 /* 32 */ F(f0), F(f1), F(f2), F(f3), F(f4), F(f5), F(f6), F(f7), \
1722 /* 40 */ F(f8), F(f9), F(f10),F(f11),F(f12),F(f13),F(f14),F(f15), \
1723 /* 48 */ F(f16),F(f17),F(f18),F(f19),F(f20),F(f21),F(f22),F(f23), \
1724 /* 56 */ F(f24),F(f25),F(f26),F(f27),F(f28),F(f29),F(f30),F(f31), \
1725 /* 64 */ R(pc), R(ps)
1727 /* UISA-level SPRs for PowerPC. */
1728 #define PPC_UISA_SPRS \
1729 /* 66 */ R4(cr), R(lr), R(ctr), R4(xer), R0
1731 /* Segment registers, for PowerPC. */
1732 #define PPC_SEGMENT_REGS \
1733 /* 71 */ R32(sr0), R32(sr1), R32(sr2), R32(sr3), \
1734 /* 75 */ R32(sr4), R32(sr5), R32(sr6), R32(sr7), \
1735 /* 79 */ R32(sr8), R32(sr9), R32(sr10), R32(sr11), \
1736 /* 83 */ R32(sr12), R32(sr13), R32(sr14), R32(sr15)
1738 /* OEA SPRs for PowerPC. */
1739 #define PPC_OEA_SPRS \
1741 /* 88 */ R(ibat0u), R(ibat0l), R(ibat1u), R(ibat1l), \
1742 /* 92 */ R(ibat2u), R(ibat2l), R(ibat3u), R(ibat3l), \
1743 /* 96 */ R(dbat0u), R(dbat0l), R(dbat1u), R(dbat1l), \
1744 /* 100 */ R(dbat2u), R(dbat2l), R(dbat3u), R(dbat3l), \
1745 /* 104 */ R(sdr1), R64(asr), R(dar), R4(dsisr), \
1746 /* 108 */ R(sprg0), R(sprg1), R(sprg2), R(sprg3), \
1747 /* 112 */ R(srr0), R(srr1), R(tbl), R(tbu), \
1748 /* 116 */ R4(dec), R(dabr), R4(ear)
1750 /* IBM POWER (pre-PowerPC) architecture, user-level view. We only cover
1751 user-level SPR's. */
1752 static const struct reg registers_power
[] =
1755 /* 66 */ R4(cnd
), R(lr
), R(cnt
), R4(xer
), R4(mq
)
1758 /* PowerPC UISA - a PPC processor as viewed by user-level code. A UISA-only
1759 view of the PowerPC. */
1760 static const struct reg registers_powerpc
[] =
1766 /* IBM PowerPC 403. */
1767 static const struct reg registers_403
[] =
1773 /* 119 */ R(icdbdr
), R(esr
), R(dear
), R(evpr
),
1774 /* 123 */ R(cdbcr
), R(tsr
), R(tcr
), R(pit
),
1775 /* 127 */ R(tbhi
), R(tblo
), R(srr2
), R(srr3
),
1776 /* 131 */ R(dbsr
), R(dbcr
), R(iac1
), R(iac2
),
1777 /* 135 */ R(dac1
), R(dac2
), R(dccr
), R(iccr
),
1778 /* 139 */ R(pbl1
), R(pbu1
), R(pbl2
), R(pbu2
)
1781 /* IBM PowerPC 403GC. */
1782 static const struct reg registers_403GC
[] =
1788 /* 119 */ R(icdbdr
), R(esr
), R(dear
), R(evpr
),
1789 /* 123 */ R(cdbcr
), R(tsr
), R(tcr
), R(pit
),
1790 /* 127 */ R(tbhi
), R(tblo
), R(srr2
), R(srr3
),
1791 /* 131 */ R(dbsr
), R(dbcr
), R(iac1
), R(iac2
),
1792 /* 135 */ R(dac1
), R(dac2
), R(dccr
), R(iccr
),
1793 /* 139 */ R(pbl1
), R(pbu1
), R(pbl2
), R(pbu2
),
1794 /* 143 */ R(zpr
), R(pid
), R(sgr
), R(dcwr
),
1795 /* 147 */ R(tbhu
), R(tblu
)
1798 /* Motorola PowerPC 505. */
1799 static const struct reg registers_505
[] =
1805 /* 119 */ R(eie
), R(eid
), R(nri
)
1808 /* Motorola PowerPC 860 or 850. */
1809 static const struct reg registers_860
[] =
1815 /* 119 */ R(eie
), R(eid
), R(nri
), R(cmpa
),
1816 /* 123 */ R(cmpb
), R(cmpc
), R(cmpd
), R(icr
),
1817 /* 127 */ R(der
), R(counta
), R(countb
), R(cmpe
),
1818 /* 131 */ R(cmpf
), R(cmpg
), R(cmph
), R(lctrl1
),
1819 /* 135 */ R(lctrl2
), R(ictrl
), R(bar
), R(ic_cst
),
1820 /* 139 */ R(ic_adr
), R(ic_dat
), R(dc_cst
), R(dc_adr
),
1821 /* 143 */ R(dc_dat
), R(dpdr
), R(dpir
), R(immr
),
1822 /* 147 */ R(mi_ctr
), R(mi_ap
), R(mi_epn
), R(mi_twc
),
1823 /* 151 */ R(mi_rpn
), R(md_ctr
), R(m_casid
), R(md_ap
),
1824 /* 155 */ R(md_epn
), R(md_twb
), R(md_twc
), R(md_rpn
),
1825 /* 159 */ R(m_tw
), R(mi_dbcam
), R(mi_dbram0
), R(mi_dbram1
),
1826 /* 163 */ R(md_dbcam
), R(md_dbram0
), R(md_dbram1
)
1829 /* Motorola PowerPC 601. Note that the 601 has different register numbers
1830 for reading and writing RTCU and RTCL. However, how one reads and writes a
1831 register is the stub's problem. */
1832 static const struct reg registers_601
[] =
1838 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1839 /* 123 */ R(pir
), R(mq
), R(rtcu
), R(rtcl
)
1842 /* Motorola PowerPC 602. */
1843 static const struct reg registers_602
[] =
1849 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R0
,
1850 /* 123 */ R0
, R(tcr
), R(ibr
), R(esassr
),
1851 /* 127 */ R(sebr
), R(ser
), R(sp
), R(lt
)
1854 /* Motorola/IBM PowerPC 603 or 603e. */
1855 static const struct reg registers_603
[] =
1861 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R0
,
1862 /* 123 */ R0
, R(dmiss
), R(dcmp
), R(hash1
),
1863 /* 127 */ R(hash2
), R(imiss
), R(icmp
), R(rpa
)
1866 /* Motorola PowerPC 604 or 604e. */
1867 static const struct reg registers_604
[] =
1873 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1874 /* 123 */ R(pir
), R(mmcr0
), R(pmc1
), R(pmc2
),
1875 /* 127 */ R(sia
), R(sda
)
1878 /* Motorola/IBM PowerPC 750 or 740. */
1879 static const struct reg registers_750
[] =
1885 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1886 /* 123 */ R0
, R(ummcr0
), R(upmc1
), R(upmc2
),
1887 /* 127 */ R(usia
), R(ummcr1
), R(upmc3
), R(upmc4
),
1888 /* 131 */ R(mmcr0
), R(pmc1
), R(pmc2
), R(sia
),
1889 /* 135 */ R(mmcr1
), R(pmc3
), R(pmc4
), R(l2cr
),
1890 /* 139 */ R(ictc
), R(thrm1
), R(thrm2
), R(thrm3
)
1894 /* Information about a particular processor variant. */
1898 /* Name of this variant. */
1901 /* English description of the variant. */
1904 /* bfd_arch_info.arch corresponding to variant. */
1905 enum bfd_architecture arch
;
1907 /* bfd_arch_info.mach corresponding to variant. */
1910 /* Table of register names; registers[R] is the name of the register
1913 const struct reg
*regs
;
1916 #define num_registers(list) (sizeof (list) / sizeof((list)[0]))
1919 /* Information in this table comes from the following web sites:
1920 IBM: http://www.chips.ibm.com:80/products/embedded/
1921 Motorola: http://www.mot.com/SPS/PowerPC/
1923 I'm sure I've got some of the variant descriptions not quite right.
1924 Please report any inaccuracies you find to GDB's maintainer.
1926 If you add entries to this table, please be sure to allow the new
1927 value as an argument to the --with-cpu flag, in configure.in. */
1929 static const struct variant variants
[] =
1931 {"powerpc", "PowerPC user-level", bfd_arch_powerpc
,
1932 bfd_mach_ppc
, num_registers (registers_powerpc
), registers_powerpc
},
1933 {"power", "POWER user-level", bfd_arch_rs6000
,
1934 bfd_mach_rs6k
, num_registers (registers_power
), registers_power
},
1935 {"403", "IBM PowerPC 403", bfd_arch_powerpc
,
1936 bfd_mach_ppc_403
, num_registers (registers_403
), registers_403
},
1937 {"601", "Motorola PowerPC 601", bfd_arch_powerpc
,
1938 bfd_mach_ppc_601
, num_registers (registers_601
), registers_601
},
1939 {"602", "Motorola PowerPC 602", bfd_arch_powerpc
,
1940 bfd_mach_ppc_602
, num_registers (registers_602
), registers_602
},
1941 {"603", "Motorola/IBM PowerPC 603 or 603e", bfd_arch_powerpc
,
1942 bfd_mach_ppc_603
, num_registers (registers_603
), registers_603
},
1943 {"604", "Motorola PowerPC 604 or 604e", bfd_arch_powerpc
,
1944 604, num_registers (registers_604
), registers_604
},
1945 {"403GC", "IBM PowerPC 403GC", bfd_arch_powerpc
,
1946 bfd_mach_ppc_403gc
, num_registers (registers_403GC
), registers_403GC
},
1947 {"505", "Motorola PowerPC 505", bfd_arch_powerpc
,
1948 bfd_mach_ppc_505
, num_registers (registers_505
), registers_505
},
1949 {"860", "Motorola PowerPC 860 or 850", bfd_arch_powerpc
,
1950 bfd_mach_ppc_860
, num_registers (registers_860
), registers_860
},
1951 {"750", "Motorola/IBM PowerPC 750 or 740", bfd_arch_powerpc
,
1952 bfd_mach_ppc_750
, num_registers (registers_750
), registers_750
},
1954 /* FIXME: I haven't checked the register sets of the following. */
1955 {"620", "Motorola PowerPC 620", bfd_arch_powerpc
,
1956 bfd_mach_ppc_620
, num_registers (registers_powerpc
), registers_powerpc
},
1957 {"a35", "PowerPC A35", bfd_arch_powerpc
,
1958 bfd_mach_ppc_a35
, num_registers (registers_powerpc
), registers_powerpc
},
1959 {"rs1", "IBM POWER RS1", bfd_arch_rs6000
,
1960 bfd_mach_rs6k_rs1
, num_registers (registers_power
), registers_power
},
1961 {"rsc", "IBM POWER RSC", bfd_arch_rs6000
,
1962 bfd_mach_rs6k_rsc
, num_registers (registers_power
), registers_power
},
1963 {"rs2", "IBM POWER RS2", bfd_arch_rs6000
,
1964 bfd_mach_rs6k_rs2
, num_registers (registers_power
), registers_power
},
1969 #undef num_registers
1971 /* Look up the variant named NAME in the `variants' table. Return a
1972 pointer to the struct variant, or null if we couldn't find it. */
1974 static const struct variant
*
1975 find_variant_by_name (char *name
)
1977 const struct variant
*v
;
1979 for (v
= variants
; v
->name
; v
++)
1980 if (!strcmp (name
, v
->name
))
1986 /* Return the variant corresponding to architecture ARCH and machine number
1987 MACH. If no such variant exists, return null. */
1989 static const struct variant
*
1990 find_variant_by_arch (enum bfd_architecture arch
, unsigned long mach
)
1992 const struct variant
*v
;
1994 for (v
= variants
; v
->name
; v
++)
1995 if (arch
== v
->arch
&& mach
== v
->mach
)
2005 process_note_abi_tag_sections (bfd
*abfd
, asection
*sect
, void *obj
)
2007 int *os_ident_ptr
= obj
;
2009 unsigned int sectsize
;
2011 name
= bfd_get_section_name (abfd
, sect
);
2012 sectsize
= bfd_section_size (abfd
, sect
);
2013 if (strcmp (name
, ".note.ABI-tag") == 0 && sectsize
> 0)
2015 unsigned int name_length
, data_length
, note_type
;
2016 char *note
= alloca (sectsize
);
2018 bfd_get_section_contents (abfd
, sect
, note
,
2019 (file_ptr
) 0, (bfd_size_type
) sectsize
);
2021 name_length
= bfd_h_get_32 (abfd
, note
);
2022 data_length
= bfd_h_get_32 (abfd
, note
+ 4);
2023 note_type
= bfd_h_get_32 (abfd
, note
+ 8);
2025 if (name_length
== 4 && data_length
== 16 && note_type
== 1
2026 && strcmp (note
+ 12, "GNU") == 0)
2028 int os_number
= bfd_h_get_32 (abfd
, note
+ 16);
2030 /* The case numbers are from abi-tags in glibc */
2034 *os_ident_ptr
= ELFOSABI_LINUX
;
2037 *os_ident_ptr
= ELFOSABI_HURD
;
2040 *os_ident_ptr
= ELFOSABI_SOLARIS
;
2043 internal_error (__FILE__
, __LINE__
,
2044 "process_note_abi_sections: unknown OS number %d",
2052 /* Return one of the ELFOSABI_ constants for BFDs representing ELF
2053 executables. If it's not an ELF executable or if the OS/ABI couldn't
2054 be determined, simply return -1. */
2057 get_elfosabi (bfd
*abfd
)
2061 if (abfd
!= NULL
&& bfd_get_flavour (abfd
) == bfd_target_elf_flavour
)
2063 elfosabi
= elf_elfheader (abfd
)->e_ident
[EI_OSABI
];
2065 /* When elfosabi is 0 (ELFOSABI_NONE), this is supposed to indicate
2066 that we're on a SYSV system. However, GNU/Linux uses a note section
2067 to record OS/ABI info, but leaves e_ident[EI_OSABI] zero. So we
2068 have to check the note sections too. */
2071 bfd_map_over_sections (abfd
,
2072 process_note_abi_tag_sections
,
2082 /* Initialize the current architecture based on INFO. If possible, re-use an
2083 architecture from ARCHES, which is a list of architectures already created
2084 during this debugging session.
2086 Called e.g. at program startup, when reading a core file, and when reading
2089 static struct gdbarch
*
2090 rs6000_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
2092 struct gdbarch
*gdbarch
;
2093 struct gdbarch_tdep
*tdep
;
2094 int wordsize
, from_xcoff_exec
, from_elf_exec
, power
, i
, off
;
2096 const struct variant
*v
;
2097 enum bfd_architecture arch
;
2100 int osabi
, sysv_abi
;
2102 from_xcoff_exec
= info
.abfd
&& info
.abfd
->format
== bfd_object
&&
2103 bfd_get_flavour (info
.abfd
) == bfd_target_xcoff_flavour
;
2105 from_elf_exec
= info
.abfd
&& info
.abfd
->format
== bfd_object
&&
2106 bfd_get_flavour (info
.abfd
) == bfd_target_elf_flavour
;
2108 sysv_abi
= info
.abfd
&& bfd_get_flavour (info
.abfd
) == bfd_target_elf_flavour
;
2110 osabi
= get_elfosabi (info
.abfd
);
2112 /* Check word size. If INFO is from a binary file, infer it from that,
2113 else use the previously-inferred size. */
2114 if (from_xcoff_exec
)
2116 if (xcoff_data (info
.abfd
)->xcoff64
)
2121 else if (from_elf_exec
)
2123 if (elf_elfheader (info
.abfd
)->e_ident
[EI_CLASS
] == ELFCLASS64
)
2132 wordsize
= tdep
->wordsize
;
2137 /* Find a candidate among extant architectures. */
2138 for (arches
= gdbarch_list_lookup_by_info (arches
, &info
);
2140 arches
= gdbarch_list_lookup_by_info (arches
->next
, &info
))
2142 /* Word size in the various PowerPC bfd_arch_info structs isn't
2143 meaningful, because 64-bit CPUs can run in 32-bit mode. So, perform
2144 separate word size check. */
2145 tdep
= gdbarch_tdep (arches
->gdbarch
);
2146 if (tdep
&& tdep
->wordsize
== wordsize
&& tdep
->osabi
== osabi
)
2147 return arches
->gdbarch
;
2150 /* None found, create a new architecture from INFO, whose bfd_arch_info
2151 validity depends on the source:
2152 - executable useless
2153 - rs6000_host_arch() good
2155 - "set arch" trust blindly
2156 - GDB startup useless but harmless */
2158 if (!from_xcoff_exec
)
2160 arch
= info
.bfd_architecture
;
2161 mach
= info
.bfd_arch_info
->mach
;
2165 arch
= bfd_arch_powerpc
;
2167 bfd_default_set_arch_mach (&abfd
, arch
, mach
);
2168 info
.bfd_arch_info
= bfd_get_arch_info (&abfd
);
2170 tdep
= xmalloc (sizeof (struct gdbarch_tdep
));
2171 tdep
->wordsize
= wordsize
;
2172 tdep
->osabi
= osabi
;
2173 gdbarch
= gdbarch_alloc (&info
, tdep
);
2174 power
= arch
== bfd_arch_rs6000
;
2176 /* Select instruction printer. */
2177 tm_print_insn
= arch
== power
? print_insn_rs6000
:
2178 info
.byte_order
== BIG_ENDIAN
? print_insn_big_powerpc
:
2179 print_insn_little_powerpc
;
2181 /* Choose variant. */
2182 v
= find_variant_by_arch (arch
, mach
);
2184 v
= find_variant_by_name (power
? "power" : "powerpc");
2185 tdep
->regs
= v
->regs
;
2187 /* Calculate byte offsets in raw register array. */
2188 tdep
->regoff
= xmalloc (v
->nregs
* sizeof (int));
2189 for (i
= off
= 0; i
< v
->nregs
; i
++)
2191 tdep
->regoff
[i
] = off
;
2192 off
+= regsize (v
->regs
+ i
, wordsize
);
2195 set_gdbarch_read_pc (gdbarch
, generic_target_read_pc
);
2196 set_gdbarch_write_pc (gdbarch
, generic_target_write_pc
);
2197 set_gdbarch_read_fp (gdbarch
, generic_target_read_fp
);
2198 set_gdbarch_write_fp (gdbarch
, generic_target_write_fp
);
2199 set_gdbarch_read_sp (gdbarch
, generic_target_read_sp
);
2200 set_gdbarch_write_sp (gdbarch
, generic_target_write_sp
);
2202 set_gdbarch_num_regs (gdbarch
, v
->nregs
);
2203 set_gdbarch_sp_regnum (gdbarch
, 1);
2204 set_gdbarch_fp_regnum (gdbarch
, 1);
2205 set_gdbarch_pc_regnum (gdbarch
, 64);
2206 set_gdbarch_register_name (gdbarch
, rs6000_register_name
);
2207 set_gdbarch_register_size (gdbarch
, wordsize
);
2208 set_gdbarch_register_bytes (gdbarch
, off
);
2209 set_gdbarch_register_byte (gdbarch
, rs6000_register_byte
);
2210 set_gdbarch_register_raw_size (gdbarch
, rs6000_register_raw_size
);
2211 set_gdbarch_max_register_raw_size (gdbarch
, 8);
2212 set_gdbarch_register_virtual_size (gdbarch
, rs6000_register_virtual_size
);
2213 set_gdbarch_max_register_virtual_size (gdbarch
, 8);
2214 set_gdbarch_register_virtual_type (gdbarch
, rs6000_register_virtual_type
);
2216 set_gdbarch_ptr_bit (gdbarch
, wordsize
* TARGET_CHAR_BIT
);
2217 set_gdbarch_short_bit (gdbarch
, 2 * TARGET_CHAR_BIT
);
2218 set_gdbarch_int_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
2219 set_gdbarch_long_bit (gdbarch
, wordsize
* TARGET_CHAR_BIT
);
2220 set_gdbarch_long_long_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2221 set_gdbarch_float_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
2222 set_gdbarch_double_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2223 set_gdbarch_long_double_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2225 set_gdbarch_use_generic_dummy_frames (gdbarch
, 1);
2226 set_gdbarch_call_dummy_length (gdbarch
, 0);
2227 set_gdbarch_call_dummy_location (gdbarch
, AT_ENTRY_POINT
);
2228 set_gdbarch_call_dummy_address (gdbarch
, entry_point_address
);
2229 set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch
, 1);
2230 set_gdbarch_call_dummy_breakpoint_offset (gdbarch
, 0);
2231 set_gdbarch_call_dummy_start_offset (gdbarch
, 0);
2232 set_gdbarch_pc_in_call_dummy (gdbarch
, generic_pc_in_call_dummy
);
2233 set_gdbarch_call_dummy_p (gdbarch
, 1);
2234 set_gdbarch_call_dummy_stack_adjust_p (gdbarch
, 0);
2235 set_gdbarch_get_saved_register (gdbarch
, generic_get_saved_register
);
2236 set_gdbarch_fix_call_dummy (gdbarch
, rs6000_fix_call_dummy
);
2237 set_gdbarch_push_dummy_frame (gdbarch
, generic_push_dummy_frame
);
2238 set_gdbarch_save_dummy_frame_tos (gdbarch
, generic_save_dummy_frame_tos
);
2239 set_gdbarch_push_return_address (gdbarch
, ppc_push_return_address
);
2240 set_gdbarch_believe_pcc_promotion (gdbarch
, 1);
2241 set_gdbarch_coerce_float_to_double (gdbarch
, rs6000_coerce_float_to_double
);
2243 set_gdbarch_register_convertible (gdbarch
, rs6000_register_convertible
);
2244 set_gdbarch_register_convert_to_virtual (gdbarch
, rs6000_register_convert_to_virtual
);
2245 set_gdbarch_register_convert_to_raw (gdbarch
, rs6000_register_convert_to_raw
);
2247 set_gdbarch_extract_return_value (gdbarch
, rs6000_extract_return_value
);
2250 set_gdbarch_push_arguments (gdbarch
, ppc_sysv_abi_push_arguments
);
2252 set_gdbarch_push_arguments (gdbarch
, rs6000_push_arguments
);
2254 set_gdbarch_store_struct_return (gdbarch
, rs6000_store_struct_return
);
2255 set_gdbarch_store_return_value (gdbarch
, rs6000_store_return_value
);
2256 set_gdbarch_extract_struct_value_address (gdbarch
, rs6000_extract_struct_value_address
);
2257 set_gdbarch_use_struct_convention (gdbarch
, generic_use_struct_convention
);
2259 set_gdbarch_pop_frame (gdbarch
, rs6000_pop_frame
);
2261 set_gdbarch_skip_prologue (gdbarch
, rs6000_skip_prologue
);
2262 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
2263 set_gdbarch_decr_pc_after_break (gdbarch
, 0);
2264 set_gdbarch_function_start_offset (gdbarch
, 0);
2265 set_gdbarch_breakpoint_from_pc (gdbarch
, rs6000_breakpoint_from_pc
);
2267 /* Not sure on this. FIXMEmgo */
2268 set_gdbarch_frame_args_skip (gdbarch
, 8);
2270 set_gdbarch_frame_chain_valid (gdbarch
, file_frame_chain_valid
);
2271 if (osabi
== ELFOSABI_LINUX
)
2273 set_gdbarch_frameless_function_invocation (gdbarch
,
2274 ppc_linux_frameless_function_invocation
);
2275 set_gdbarch_frame_chain (gdbarch
, ppc_linux_frame_chain
);
2276 set_gdbarch_frame_saved_pc (gdbarch
, ppc_linux_frame_saved_pc
);
2278 set_gdbarch_frame_init_saved_regs (gdbarch
,
2279 ppc_linux_frame_init_saved_regs
);
2280 set_gdbarch_init_extra_frame_info (gdbarch
,
2281 ppc_linux_init_extra_frame_info
);
2283 set_gdbarch_memory_remove_breakpoint (gdbarch
,
2284 ppc_linux_memory_remove_breakpoint
);
2288 set_gdbarch_frameless_function_invocation (gdbarch
,
2289 rs6000_frameless_function_invocation
);
2290 set_gdbarch_frame_chain (gdbarch
, rs6000_frame_chain
);
2291 set_gdbarch_frame_saved_pc (gdbarch
, rs6000_frame_saved_pc
);
2293 set_gdbarch_frame_init_saved_regs (gdbarch
, rs6000_frame_init_saved_regs
);
2294 set_gdbarch_init_extra_frame_info (gdbarch
, rs6000_init_extra_frame_info
);
2296 /* Handle RS/6000 function pointers. */
2297 set_gdbarch_convert_from_func_ptr_addr (gdbarch
,
2298 rs6000_convert_from_func_ptr_addr
);
2300 set_gdbarch_frame_args_address (gdbarch
, rs6000_frame_args_address
);
2301 set_gdbarch_frame_locals_address (gdbarch
, rs6000_frame_args_address
);
2302 set_gdbarch_saved_pc_after_call (gdbarch
, rs6000_saved_pc_after_call
);
2304 /* We can't tell how many args there are
2305 now that the C compiler delays popping them. */
2306 set_gdbarch_frame_num_args (gdbarch
, frame_num_args_unknown
);
2311 /* Initialization code. */
2314 _initialize_rs6000_tdep (void)
2316 register_gdbarch_init (bfd_arch_rs6000
, rs6000_gdbarch_init
);
2317 register_gdbarch_init (bfd_arch_powerpc
, rs6000_gdbarch_init
);