1 /* Target-dependent code for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
31 #include "arch-utils.h"
33 #include "bfd/libbfd.h" /* for bfd_default_set_arch_mach */
34 #include "coff/internal.h" /* for libcoff.h */
35 #include "bfd/libcoff.h" /* for xcoff_data */
41 /* If the kernel has to deliver a signal, it pushes a sigcontext
42 structure on the stack and then calls the signal handler, passing
43 the address of the sigcontext in an argument register. Usually
44 the signal handler doesn't save this register, so we have to
45 access the sigcontext structure via an offset from the signal handler
47 The following constants were determined by experimentation on AIX 3.2. */
48 #define SIG_FRAME_PC_OFFSET 96
49 #define SIG_FRAME_LR_OFFSET 108
50 #define SIG_FRAME_FP_OFFSET 284
52 /* To be used by skip_prologue. */
54 struct rs6000_framedata
56 int offset
; /* total size of frame --- the distance
57 by which we decrement sp to allocate
59 int saved_gpr
; /* smallest # of saved gpr */
60 int saved_fpr
; /* smallest # of saved fpr */
61 int alloca_reg
; /* alloca register number (frame ptr) */
62 char frameless
; /* true if frameless functions. */
63 char nosavedpc
; /* true if pc not saved. */
64 int gpr_offset
; /* offset of saved gprs from prev sp */
65 int fpr_offset
; /* offset of saved fprs from prev sp */
66 int lr_offset
; /* offset of saved lr */
67 int cr_offset
; /* offset of saved cr */
70 /* Description of a single register. */
74 char *name
; /* name of register */
75 unsigned char sz32
; /* size on 32-bit arch, 0 if nonextant */
76 unsigned char sz64
; /* size on 64-bit arch, 0 if nonextant */
77 unsigned char fpr
; /* whether register is floating-point */
80 /* Private data that this module attaches to struct gdbarch. */
84 int wordsize
; /* size in bytes of fixed-point word */
85 int osabi
; /* OS / ABI from ELF header */
86 int *regoff
; /* byte offsets in register arrays */
87 const struct reg
*regs
; /* from current variant */
90 /* Return the current architecture's gdbarch_tdep structure. */
92 #define TDEP gdbarch_tdep (current_gdbarch)
94 /* Breakpoint shadows for the single step instructions will be kept here. */
96 static struct sstep_breaks
98 /* Address, or 0 if this is not in use. */
100 /* Shadow contents. */
105 /* Hook for determining the TOC address when calling functions in the
106 inferior under AIX. The initialization code in rs6000-nat.c sets
107 this hook to point to find_toc_address. */
109 CORE_ADDR (*rs6000_find_toc_address_hook
) (CORE_ADDR
) = NULL
;
111 /* Hook to set the current architecture when starting a child process.
112 rs6000-nat.c sets this. */
114 void (*rs6000_set_host_arch_hook
) (int) = NULL
;
116 /* Static function prototypes */
118 static CORE_ADDR
branch_dest (int opcode
, int instr
, CORE_ADDR pc
,
120 static CORE_ADDR
skip_prologue (CORE_ADDR
, CORE_ADDR
,
121 struct rs6000_framedata
*);
122 static void frame_get_saved_regs (struct frame_info
* fi
,
123 struct rs6000_framedata
* fdatap
);
124 static CORE_ADDR
frame_initial_stack_address (struct frame_info
*);
126 /* Read a LEN-byte address from debugged memory address MEMADDR. */
129 read_memory_addr (CORE_ADDR memaddr
, int len
)
131 return read_memory_unsigned_integer (memaddr
, len
);
135 rs6000_skip_prologue (CORE_ADDR pc
)
137 struct rs6000_framedata frame
;
138 pc
= skip_prologue (pc
, 0, &frame
);
143 /* Fill in fi->saved_regs */
145 struct frame_extra_info
147 /* Functions calling alloca() change the value of the stack
148 pointer. We need to use initial stack pointer (which is saved in
149 r31 by gcc) in such cases. If a compiler emits traceback table,
150 then we should use the alloca register specified in traceback
152 CORE_ADDR initial_sp
; /* initial stack pointer. */
156 rs6000_init_extra_frame_info (int fromleaf
, struct frame_info
*fi
)
158 fi
->extra_info
= (struct frame_extra_info
*)
159 frame_obstack_alloc (sizeof (struct frame_extra_info
));
160 fi
->extra_info
->initial_sp
= 0;
161 if (fi
->next
!= (CORE_ADDR
) 0
162 && fi
->pc
< TEXT_SEGMENT_BASE
)
163 /* We're in get_prev_frame */
164 /* and this is a special signal frame. */
165 /* (fi->pc will be some low address in the kernel, */
166 /* to which the signal handler returns). */
167 fi
->signal_handler_caller
= 1;
170 /* Put here the code to store, into a struct frame_saved_regs,
171 the addresses of the saved registers of frame described by FRAME_INFO.
172 This includes special registers such as pc and fp saved in special
173 ways in the stack frame. sp is even more special:
174 the address we return for it IS the sp for the next frame. */
176 /* In this implementation for RS/6000, we do *not* save sp. I am
177 not sure if it will be needed. The following function takes care of gpr's
181 rs6000_frame_init_saved_regs (struct frame_info
*fi
)
183 frame_get_saved_regs (fi
, NULL
);
187 rs6000_frame_args_address (struct frame_info
*fi
)
189 if (fi
->extra_info
->initial_sp
!= 0)
190 return fi
->extra_info
->initial_sp
;
192 return frame_initial_stack_address (fi
);
195 /* Immediately after a function call, return the saved pc.
196 Can't go through the frames for this because on some machines
197 the new frame is not set up until the new function executes
198 some instructions. */
201 rs6000_saved_pc_after_call (struct frame_info
*fi
)
203 return read_register (PPC_LR_REGNUM
);
206 /* Calculate the destination of a branch/jump. Return -1 if not a branch. */
209 branch_dest (int opcode
, int instr
, CORE_ADDR pc
, CORE_ADDR safety
)
216 absolute
= (int) ((instr
>> 1) & 1);
221 immediate
= ((instr
& ~3) << 6) >> 6; /* br unconditional */
225 dest
= pc
+ immediate
;
229 immediate
= ((instr
& ~3) << 16) >> 16; /* br conditional */
233 dest
= pc
+ immediate
;
237 ext_op
= (instr
>> 1) & 0x3ff;
239 if (ext_op
== 16) /* br conditional register */
241 dest
= read_register (PPC_LR_REGNUM
) & ~3;
243 /* If we are about to return from a signal handler, dest is
244 something like 0x3c90. The current frame is a signal handler
245 caller frame, upon completion of the sigreturn system call
246 execution will return to the saved PC in the frame. */
247 if (dest
< TEXT_SEGMENT_BASE
)
249 struct frame_info
*fi
;
251 fi
= get_current_frame ();
253 dest
= read_memory_addr (fi
->frame
+ SIG_FRAME_PC_OFFSET
,
258 else if (ext_op
== 528) /* br cond to count reg */
260 dest
= read_register (PPC_CTR_REGNUM
) & ~3;
262 /* If we are about to execute a system call, dest is something
263 like 0x22fc or 0x3b00. Upon completion the system call
264 will return to the address in the link register. */
265 if (dest
< TEXT_SEGMENT_BASE
)
266 dest
= read_register (PPC_LR_REGNUM
) & ~3;
275 return (dest
< TEXT_SEGMENT_BASE
) ? safety
: dest
;
279 /* Sequence of bytes for breakpoint instruction. */
281 #define BIG_BREAKPOINT { 0x7d, 0x82, 0x10, 0x08 }
282 #define LITTLE_BREAKPOINT { 0x08, 0x10, 0x82, 0x7d }
284 static unsigned char *
285 rs6000_breakpoint_from_pc (CORE_ADDR
*bp_addr
, int *bp_size
)
287 static unsigned char big_breakpoint
[] = BIG_BREAKPOINT
;
288 static unsigned char little_breakpoint
[] = LITTLE_BREAKPOINT
;
290 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
)
291 return big_breakpoint
;
293 return little_breakpoint
;
297 /* AIX does not support PT_STEP. Simulate it. */
300 rs6000_software_single_step (unsigned int signal
, 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
== BIG_ENDIAN
? 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 - alloca_reg is the number of the register used for alloca() handling.
370 - gpr_offset is the offset of the first saved gpr from the previous frame.
371 - fpr_offset is the offset of the first saved fpr from the previous frame.
372 - lr_offset is the offset of the saved lr
373 - cr_offset is the offset of the saved cr
376 #define SIGNED_SHORT(x) \
377 ((sizeof (short) == 2) \
378 ? ((int)(short)(x)) \
379 : ((int)((((x) & 0xffff) ^ 0x8000) - 0x8000)))
381 #define GET_SRC_REG(x) (((x) >> 21) & 0x1f)
383 /* Limit the number of skipped non-prologue instructions, as the examining
384 of the prologue is expensive. */
385 static int max_skip_non_prologue_insns
= 10;
387 /* Given PC representing the starting address of a function, and
388 LIM_PC which is the (sloppy) limit to which to scan when looking
389 for a prologue, attempt to further refine this limit by using
390 the line data in the symbol table. If successful, a better guess
391 on where the prologue ends is returned, otherwise the previous
392 value of lim_pc is returned. */
394 refine_prologue_limit (CORE_ADDR pc
, CORE_ADDR lim_pc
)
396 struct symtab_and_line prologue_sal
;
398 prologue_sal
= find_pc_line (pc
, 0);
399 if (prologue_sal
.line
!= 0)
402 CORE_ADDR addr
= prologue_sal
.end
;
404 /* Handle the case in which compiler's optimizer/scheduler
405 has moved instructions into the prologue. We scan ahead
406 in the function looking for address ranges whose corresponding
407 line number is less than or equal to the first one that we
408 found for the function. (It can be less than when the
409 scheduler puts a body instruction before the first prologue
411 for (i
= 2 * max_skip_non_prologue_insns
;
412 i
> 0 && (lim_pc
== 0 || addr
< lim_pc
);
415 struct symtab_and_line sal
;
417 sal
= find_pc_line (addr
, 0);
420 if (sal
.line
<= prologue_sal
.line
421 && sal
.symtab
== prologue_sal
.symtab
)
428 if (lim_pc
== 0 || prologue_sal
.end
< lim_pc
)
429 lim_pc
= prologue_sal
.end
;
436 skip_prologue (CORE_ADDR pc
, CORE_ADDR lim_pc
, struct rs6000_framedata
*fdata
)
438 CORE_ADDR orig_pc
= pc
;
439 CORE_ADDR last_prologue_pc
= pc
;
447 int minimal_toc_loaded
= 0;
448 int prev_insn_was_prologue_insn
= 1;
449 int num_skip_non_prologue_insns
= 0;
451 /* Attempt to find the end of the prologue when no limit is specified.
452 Note that refine_prologue_limit() has been written so that it may
453 be used to "refine" the limits of non-zero PC values too, but this
454 is only safe if we 1) trust the line information provided by the
455 compiler and 2) iterate enough to actually find the end of the
458 It may become a good idea at some point (for both performance and
459 accuracy) to unconditionally call refine_prologue_limit(). But,
460 until we can make a clear determination that this is beneficial,
461 we'll play it safe and only use it to obtain a limit when none
462 has been specified. */
464 lim_pc
= refine_prologue_limit (pc
, lim_pc
);
466 memset (fdata
, 0, sizeof (struct rs6000_framedata
));
467 fdata
->saved_gpr
= -1;
468 fdata
->saved_fpr
= -1;
469 fdata
->alloca_reg
= -1;
470 fdata
->frameless
= 1;
471 fdata
->nosavedpc
= 1;
475 /* Sometimes it isn't clear if an instruction is a prologue
476 instruction or not. When we encounter one of these ambiguous
477 cases, we'll set prev_insn_was_prologue_insn to 0 (false).
478 Otherwise, we'll assume that it really is a prologue instruction. */
479 if (prev_insn_was_prologue_insn
)
480 last_prologue_pc
= pc
;
482 /* Stop scanning if we've hit the limit. */
483 if (lim_pc
!= 0 && pc
>= lim_pc
)
486 prev_insn_was_prologue_insn
= 1;
488 /* Fetch the instruction and convert it to an integer. */
489 if (target_read_memory (pc
, buf
, 4))
491 op
= extract_signed_integer (buf
, 4);
493 if ((op
& 0xfc1fffff) == 0x7c0802a6)
495 lr_reg
= (op
& 0x03e00000) | 0x90010000;
499 else if ((op
& 0xfc1fffff) == 0x7c000026)
501 cr_reg
= (op
& 0x03e00000) | 0x90010000;
505 else if ((op
& 0xfc1f0000) == 0xd8010000)
506 { /* stfd Rx,NUM(r1) */
507 reg
= GET_SRC_REG (op
);
508 if (fdata
->saved_fpr
== -1 || fdata
->saved_fpr
> reg
)
510 fdata
->saved_fpr
= reg
;
511 fdata
->fpr_offset
= SIGNED_SHORT (op
) + offset
;
516 else if (((op
& 0xfc1f0000) == 0xbc010000) || /* stm Rx, NUM(r1) */
517 (((op
& 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
518 (op
& 0xfc1f0003) == 0xf8010000) && /* std rx,NUM(r1) */
519 (op
& 0x03e00000) >= 0x01a00000)) /* rx >= r13 */
522 reg
= GET_SRC_REG (op
);
523 if (fdata
->saved_gpr
== -1 || fdata
->saved_gpr
> reg
)
525 fdata
->saved_gpr
= reg
;
526 if ((op
& 0xfc1f0003) == 0xf8010000)
528 fdata
->gpr_offset
= SIGNED_SHORT (op
) + offset
;
533 else if ((op
& 0xffff0000) == 0x60000000)
536 /* Allow nops in the prologue, but do not consider them to
537 be part of the prologue unless followed by other prologue
539 prev_insn_was_prologue_insn
= 0;
543 else if ((op
& 0xffff0000) == 0x3c000000)
544 { /* addis 0,0,NUM, used
546 fdata
->offset
= (op
& 0x0000ffff) << 16;
547 fdata
->frameless
= 0;
551 else if ((op
& 0xffff0000) == 0x60000000)
552 { /* ori 0,0,NUM, 2nd ha
553 lf of >= 32k frames */
554 fdata
->offset
|= (op
& 0x0000ffff);
555 fdata
->frameless
= 0;
559 else if (lr_reg
!= -1 && (op
& 0xffff0000) == lr_reg
)
562 fdata
->lr_offset
= SIGNED_SHORT (op
) + offset
;
563 fdata
->nosavedpc
= 0;
568 else if (cr_reg
!= -1 && (op
& 0xffff0000) == cr_reg
)
571 fdata
->cr_offset
= SIGNED_SHORT (op
) + offset
;
576 else if (op
== 0x48000005)
582 else if (op
== 0x48000004)
587 else if (((op
& 0xffff0000) == 0x801e0000 || /* lwz 0,NUM(r30), used
588 in V.4 -mrelocatable */
589 op
== 0x7fc0f214) && /* add r30,r0,r30, used
590 in V.4 -mrelocatable */
591 lr_reg
== 0x901e0000)
596 else if ((op
& 0xffff0000) == 0x3fc00000 || /* addis 30,0,foo@ha, used
597 in V.4 -mminimal-toc */
598 (op
& 0xffff0000) == 0x3bde0000)
599 { /* addi 30,30,foo@l */
603 else if ((op
& 0xfc000001) == 0x48000001)
607 fdata
->frameless
= 0;
608 /* Don't skip over the subroutine call if it is not within the first
609 three instructions of the prologue. */
610 if ((pc
- orig_pc
) > 8)
613 op
= read_memory_integer (pc
+ 4, 4);
615 /* At this point, make sure this is not a trampoline function
616 (a function that simply calls another functions, and nothing else).
617 If the next is not a nop, this branch was part of the function
620 if (op
== 0x4def7b82 || op
== 0) /* crorc 15, 15, 15 */
621 break; /* don't skip over
625 /* update stack pointer */
627 else if ((op
& 0xffff0000) == 0x94210000 || /* stu r1,NUM(r1) */
628 (op
& 0xffff0003) == 0xf8210001) /* stdu r1,NUM(r1) */
630 fdata
->frameless
= 0;
631 if ((op
& 0xffff0003) == 0xf8210001)
633 fdata
->offset
= SIGNED_SHORT (op
);
634 offset
= fdata
->offset
;
638 else if (op
== 0x7c21016e)
640 fdata
->frameless
= 0;
641 offset
= fdata
->offset
;
644 /* Load up minimal toc pointer */
646 else if ((op
>> 22) == 0x20f
647 && !minimal_toc_loaded
)
648 { /* l r31,... or l r30,... */
649 minimal_toc_loaded
= 1;
652 /* move parameters from argument registers to local variable
655 else if ((op
& 0xfc0007fe) == 0x7c000378 && /* mr(.) Rx,Ry */
656 (((op
>> 21) & 31) >= 3) && /* R3 >= Ry >= R10 */
657 (((op
>> 21) & 31) <= 10) &&
658 (((op
>> 16) & 31) >= fdata
->saved_gpr
)) /* Rx: local var reg */
662 /* store parameters in stack */
664 else if ((op
& 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
665 (op
& 0xfc1f0003) == 0xf8010000 || /* std rx,NUM(r1) */
666 (op
& 0xfc1f0000) == 0xd8010000 || /* stfd Rx,NUM(r1) */
667 (op
& 0xfc1f0000) == 0xfc010000) /* frsp, fp?,NUM(r1) */
671 /* store parameters in stack via frame pointer */
674 ((op
& 0xfc1f0000) == 0x901f0000 || /* st rx,NUM(r1) */
675 (op
& 0xfc1f0000) == 0xd81f0000 || /* stfd Rx,NUM(r1) */
676 (op
& 0xfc1f0000) == 0xfc1f0000))
677 { /* frsp, fp?,NUM(r1) */
680 /* Set up frame pointer */
682 else if (op
== 0x603f0000 /* oril r31, r1, 0x0 */
685 fdata
->frameless
= 0;
687 fdata
->alloca_reg
= 31;
690 /* Another way to set up the frame pointer. */
692 else if ((op
& 0xfc1fffff) == 0x38010000)
693 { /* addi rX, r1, 0x0 */
694 fdata
->frameless
= 0;
696 fdata
->alloca_reg
= (op
& ~0x38010000) >> 21;
702 /* Not a recognized prologue instruction.
703 Handle optimizer code motions into the prologue by continuing
704 the search if we have no valid frame yet or if the return
705 address is not yet saved in the frame. */
706 if (fdata
->frameless
== 0
707 && (lr_reg
== -1 || fdata
->nosavedpc
== 0))
710 if (op
== 0x4e800020 /* blr */
711 || op
== 0x4e800420) /* bctr */
712 /* Do not scan past epilogue in frameless functions or
715 if ((op
& 0xf4000000) == 0x40000000) /* bxx */
716 /* Never skip branches. */
719 if (num_skip_non_prologue_insns
++ > max_skip_non_prologue_insns
)
720 /* Do not scan too many insns, scanning insns is expensive with
724 /* Continue scanning. */
725 prev_insn_was_prologue_insn
= 0;
731 /* I have problems with skipping over __main() that I need to address
732 * sometime. Previously, I used to use misc_function_vector which
733 * didn't work as well as I wanted to be. -MGO */
735 /* If the first thing after skipping a prolog is a branch to a function,
736 this might be a call to an initializer in main(), introduced by gcc2.
737 We'd like to skip over it as well. Fortunately, xlc does some extra
738 work before calling a function right after a prologue, thus we can
739 single out such gcc2 behaviour. */
742 if ((op
& 0xfc000001) == 0x48000001)
743 { /* bl foo, an initializer function? */
744 op
= read_memory_integer (pc
+ 4, 4);
746 if (op
== 0x4def7b82)
747 { /* cror 0xf, 0xf, 0xf (nop) */
749 /* check and see if we are in main. If so, skip over this initializer
752 tmp
= find_pc_misc_function (pc
);
753 if (tmp
>= 0 && STREQ (misc_function_vector
[tmp
].name
, "main"))
759 fdata
->offset
= -fdata
->offset
;
760 return last_prologue_pc
;
764 /*************************************************************************
765 Support for creating pushing a dummy frame into the stack, and popping
767 *************************************************************************/
770 /* Pop the innermost frame, go back to the caller. */
773 rs6000_pop_frame (void)
775 CORE_ADDR pc
, lr
, sp
, prev_sp
, addr
; /* %pc, %lr, %sp */
776 struct rs6000_framedata fdata
;
777 struct frame_info
*frame
= get_current_frame ();
781 sp
= FRAME_FP (frame
);
783 if (PC_IN_CALL_DUMMY (frame
->pc
, frame
->frame
, frame
->frame
))
785 generic_pop_dummy_frame ();
786 flush_cached_frames ();
790 /* Make sure that all registers are valid. */
791 read_register_bytes (0, NULL
, REGISTER_BYTES
);
793 /* figure out previous %pc value. If the function is frameless, it is
794 still in the link register, otherwise walk the frames and retrieve the
795 saved %pc value in the previous frame. */
797 addr
= get_pc_function_start (frame
->pc
);
798 (void) skip_prologue (addr
, frame
->pc
, &fdata
);
800 wordsize
= TDEP
->wordsize
;
804 prev_sp
= read_memory_addr (sp
, wordsize
);
805 if (fdata
.lr_offset
== 0)
806 lr
= read_register (PPC_LR_REGNUM
);
808 lr
= read_memory_addr (prev_sp
+ fdata
.lr_offset
, wordsize
);
810 /* reset %pc value. */
811 write_register (PC_REGNUM
, lr
);
813 /* reset register values if any was saved earlier. */
815 if (fdata
.saved_gpr
!= -1)
817 addr
= prev_sp
+ fdata
.gpr_offset
;
818 for (ii
= fdata
.saved_gpr
; ii
<= 31; ++ii
)
820 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
)], wordsize
);
825 if (fdata
.saved_fpr
!= -1)
827 addr
= prev_sp
+ fdata
.fpr_offset
;
828 for (ii
= fdata
.saved_fpr
; ii
<= 31; ++ii
)
830 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
+ FP0_REGNUM
)], 8);
835 write_register (SP_REGNUM
, prev_sp
);
836 target_store_registers (-1);
837 flush_cached_frames ();
840 /* Fixup the call sequence of a dummy function, with the real function
841 address. Its arguments will be passed by gdb. */
844 rs6000_fix_call_dummy (char *dummyname
, CORE_ADDR pc
, CORE_ADDR fun
,
845 int nargs
, value_ptr
*args
, struct type
*type
,
848 #define TOC_ADDR_OFFSET 20
849 #define TARGET_ADDR_OFFSET 28
852 CORE_ADDR target_addr
;
854 if (rs6000_find_toc_address_hook
!= NULL
)
856 CORE_ADDR tocvalue
= (*rs6000_find_toc_address_hook
) (fun
);
857 write_register (PPC_TOC_REGNUM
, tocvalue
);
861 /* Pass the arguments in either registers, or in the stack. In RS/6000,
862 the first eight words of the argument list (that might be less than
863 eight parameters if some parameters occupy more than one word) are
864 passed in r3..r10 registers. float and double parameters are
865 passed in fpr's, in addition to that. Rest of the parameters if any
866 are passed in user stack. There might be cases in which half of the
867 parameter is copied into registers, the other half is pushed into
870 Stack must be aligned on 64-bit boundaries when synthesizing
873 If the function is returning a structure, then the return address is passed
874 in r3, then the first 7 words of the parameters can be passed in registers,
878 rs6000_push_arguments (int nargs
, value_ptr
*args
, CORE_ADDR sp
,
879 int struct_return
, CORE_ADDR struct_addr
)
883 int argno
; /* current argument number */
884 int argbytes
; /* current argument byte */
886 int f_argno
= 0; /* current floating point argno */
887 int wordsize
= TDEP
->wordsize
;
894 /* The first eight words of ther arguments are passed in registers. Copy
897 If the function is returning a `struct', then the first word (which
898 will be passed in r3) is used for struct return address. In that
899 case we should advance one word and start from r4 register to copy
902 ii
= struct_return
? 1 : 0;
905 effectively indirect call... gcc does...
907 return_val example( float, int);
910 float in fp0, int in r3
911 offset of stack on overflow 8/16
912 for varargs, must go by type.
914 float in r3&r4, int in r5
915 offset of stack on overflow different
917 return in r3 or f0. If no float, must study how gcc emulates floats;
918 pay attention to arg promotion.
919 User may have to cast\args to handle promotion correctly
920 since gdb won't know if prototype supplied or not.
923 for (argno
= 0, argbytes
= 0; argno
< nargs
&& ii
< 8; ++ii
)
925 int reg_size
= REGISTER_RAW_SIZE (ii
+ 3);
928 type
= check_typedef (VALUE_TYPE (arg
));
929 len
= TYPE_LENGTH (type
);
931 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
934 /* floating point arguments are passed in fpr's, as well as gpr's.
935 There are 13 fpr's reserved for passing parameters. At this point
936 there is no way we would run out of them. */
940 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
942 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
+ 1 + f_argno
)],
943 VALUE_CONTENTS (arg
),
951 /* Argument takes more than one register. */
952 while (argbytes
< len
)
954 memset (®isters
[REGISTER_BYTE (ii
+ 3)], 0, reg_size
);
955 memcpy (®isters
[REGISTER_BYTE (ii
+ 3)],
956 ((char *) VALUE_CONTENTS (arg
)) + argbytes
,
957 (len
- argbytes
) > reg_size
958 ? reg_size
: len
- argbytes
);
959 ++ii
, argbytes
+= reg_size
;
962 goto ran_out_of_registers_for_arguments
;
968 { /* Argument can fit in one register. No problem. */
969 int adj
= TARGET_BYTE_ORDER
== BIG_ENDIAN
? reg_size
- len
: 0;
970 memset (®isters
[REGISTER_BYTE (ii
+ 3)], 0, reg_size
);
971 memcpy ((char *)®isters
[REGISTER_BYTE (ii
+ 3)] + adj
,
972 VALUE_CONTENTS (arg
), len
);
977 ran_out_of_registers_for_arguments
:
979 saved_sp
= read_sp ();
980 #ifndef ELF_OBJECT_FORMAT
981 /* location for 8 parameters are always reserved. */
984 /* another six words for back chain, TOC register, link register, etc. */
987 /* stack pointer must be quadword aligned */
991 /* if there are more arguments, allocate space for them in
992 the stack, then push them starting from the ninth one. */
994 if ((argno
< nargs
) || argbytes
)
1000 space
+= ((len
- argbytes
+ 3) & -4);
1006 for (; jj
< nargs
; ++jj
)
1008 value_ptr val
= args
[jj
];
1009 space
+= ((TYPE_LENGTH (VALUE_TYPE (val
))) + 3) & -4;
1012 /* add location required for the rest of the parameters */
1013 space
= (space
+ 15) & -16;
1016 /* This is another instance we need to be concerned about securing our
1017 stack space. If we write anything underneath %sp (r1), we might conflict
1018 with the kernel who thinks he is free to use this area. So, update %sp
1019 first before doing anything else. */
1021 write_register (SP_REGNUM
, sp
);
1023 /* if the last argument copied into the registers didn't fit there
1024 completely, push the rest of it into stack. */
1028 write_memory (sp
+ 24 + (ii
* 4),
1029 ((char *) VALUE_CONTENTS (arg
)) + argbytes
,
1032 ii
+= ((len
- argbytes
+ 3) & -4) / 4;
1035 /* push the rest of the arguments into stack. */
1036 for (; argno
< nargs
; ++argno
)
1040 type
= check_typedef (VALUE_TYPE (arg
));
1041 len
= TYPE_LENGTH (type
);
1044 /* float types should be passed in fpr's, as well as in the stack. */
1045 if (TYPE_CODE (type
) == TYPE_CODE_FLT
&& f_argno
< 13)
1050 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
1052 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
+ 1 + f_argno
)],
1053 VALUE_CONTENTS (arg
),
1058 write_memory (sp
+ 24 + (ii
* 4), (char *) VALUE_CONTENTS (arg
), len
);
1059 ii
+= ((len
+ 3) & -4) / 4;
1063 /* Secure stack areas first, before doing anything else. */
1064 write_register (SP_REGNUM
, sp
);
1066 /* set back chain properly */
1067 store_address (tmp_buffer
, 4, saved_sp
);
1068 write_memory (sp
, tmp_buffer
, 4);
1070 target_store_registers (-1);
1074 /* Function: ppc_push_return_address (pc, sp)
1075 Set up the return address for the inferior function call. */
1078 ppc_push_return_address (CORE_ADDR pc
, CORE_ADDR sp
)
1080 write_register (PPC_LR_REGNUM
, CALL_DUMMY_ADDRESS ());
1084 /* Extract a function return value of type TYPE from raw register array
1085 REGBUF, and copy that return value into VALBUF in virtual format. */
1088 rs6000_extract_return_value (struct type
*valtype
, char *regbuf
, char *valbuf
)
1092 if (TYPE_CODE (valtype
) == TYPE_CODE_FLT
)
1097 /* floats and doubles are returned in fpr1. fpr's have a size of 8 bytes.
1098 We need to truncate the return value into float size (4 byte) if
1101 if (TYPE_LENGTH (valtype
) > 4) /* this is a double */
1103 ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)],
1104 TYPE_LENGTH (valtype
));
1107 memcpy (&dd
, ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)], 8);
1109 memcpy (valbuf
, &ff
, sizeof (float));
1114 /* return value is copied starting from r3. */
1115 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
1116 && TYPE_LENGTH (valtype
) < REGISTER_RAW_SIZE (3))
1117 offset
= REGISTER_RAW_SIZE (3) - TYPE_LENGTH (valtype
);
1120 regbuf
+ REGISTER_BYTE (3) + offset
,
1121 TYPE_LENGTH (valtype
));
1125 /* Keep structure return address in this variable.
1126 FIXME: This is a horrid kludge which should not be allowed to continue
1127 living. This only allows a single nested call to a structure-returning
1128 function. Come on, guys! -- gnu@cygnus.com, Aug 92 */
1130 static CORE_ADDR rs6000_struct_return_address
;
1132 /* Indirect function calls use a piece of trampoline code to do context
1133 switching, i.e. to set the new TOC table. Skip such code if we are on
1134 its first instruction (as when we have single-stepped to here).
1135 Also skip shared library trampoline code (which is different from
1136 indirect function call trampolines).
1137 Result is desired PC to step until, or NULL if we are not in
1141 rs6000_skip_trampoline_code (CORE_ADDR pc
)
1143 register unsigned int ii
, op
;
1144 CORE_ADDR solib_target_pc
;
1146 static unsigned trampoline_code
[] =
1148 0x800b0000, /* l r0,0x0(r11) */
1149 0x90410014, /* st r2,0x14(r1) */
1150 0x7c0903a6, /* mtctr r0 */
1151 0x804b0004, /* l r2,0x4(r11) */
1152 0x816b0008, /* l r11,0x8(r11) */
1153 0x4e800420, /* bctr */
1154 0x4e800020, /* br */
1158 /* If pc is in a shared library trampoline, return its target. */
1159 solib_target_pc
= find_solib_trampoline_target (pc
);
1160 if (solib_target_pc
)
1161 return solib_target_pc
;
1163 for (ii
= 0; trampoline_code
[ii
]; ++ii
)
1165 op
= read_memory_integer (pc
+ (ii
* 4), 4);
1166 if (op
!= trampoline_code
[ii
])
1169 ii
= read_register (11); /* r11 holds destination addr */
1170 pc
= read_memory_addr (ii
, TDEP
->wordsize
); /* (r11) value */
1174 /* Determines whether the function FI has a frame on the stack or not. */
1177 rs6000_frameless_function_invocation (struct frame_info
*fi
)
1179 CORE_ADDR func_start
;
1180 struct rs6000_framedata fdata
;
1182 /* Don't even think about framelessness except on the innermost frame
1183 or if the function was interrupted by a signal. */
1184 if (fi
->next
!= NULL
&& !fi
->next
->signal_handler_caller
)
1187 func_start
= get_pc_function_start (fi
->pc
);
1189 /* If we failed to find the start of the function, it is a mistake
1190 to inspect the instructions. */
1194 /* A frame with a zero PC is usually created by dereferencing a NULL
1195 function pointer, normally causing an immediate core dump of the
1196 inferior. Mark function as frameless, as the inferior has no chance
1197 of setting up a stack frame. */
1204 (void) skip_prologue (func_start
, fi
->pc
, &fdata
);
1205 return fdata
.frameless
;
1208 /* Return the PC saved in a frame */
1211 rs6000_frame_saved_pc (struct frame_info
*fi
)
1213 CORE_ADDR func_start
;
1214 struct rs6000_framedata fdata
;
1215 int wordsize
= TDEP
->wordsize
;
1217 if (fi
->signal_handler_caller
)
1218 return read_memory_addr (fi
->frame
+ SIG_FRAME_PC_OFFSET
, wordsize
);
1220 if (PC_IN_CALL_DUMMY (fi
->pc
, fi
->frame
, fi
->frame
))
1221 return generic_read_register_dummy (fi
->pc
, fi
->frame
, PC_REGNUM
);
1223 func_start
= get_pc_function_start (fi
->pc
);
1225 /* If we failed to find the start of the function, it is a mistake
1226 to inspect the instructions. */
1230 (void) skip_prologue (func_start
, fi
->pc
, &fdata
);
1232 if (fdata
.lr_offset
== 0 && fi
->next
!= NULL
)
1234 if (fi
->next
->signal_handler_caller
)
1235 return read_memory_addr (fi
->next
->frame
+ SIG_FRAME_LR_OFFSET
,
1238 return read_memory_addr (FRAME_CHAIN (fi
) + DEFAULT_LR_SAVE
,
1242 if (fdata
.lr_offset
== 0)
1243 return read_register (PPC_LR_REGNUM
);
1245 return read_memory_addr (FRAME_CHAIN (fi
) + fdata
.lr_offset
, wordsize
);
1248 /* If saved registers of frame FI are not known yet, read and cache them.
1249 &FDATAP contains rs6000_framedata; TDATAP can be NULL,
1250 in which case the framedata are read. */
1253 frame_get_saved_regs (struct frame_info
*fi
, struct rs6000_framedata
*fdatap
)
1255 CORE_ADDR frame_addr
;
1256 struct rs6000_framedata work_fdata
;
1257 int wordsize
= TDEP
->wordsize
;
1264 fdatap
= &work_fdata
;
1265 (void) skip_prologue (get_pc_function_start (fi
->pc
), fi
->pc
, fdatap
);
1268 frame_saved_regs_zalloc (fi
);
1270 /* If there were any saved registers, figure out parent's stack
1272 /* The following is true only if the frame doesn't have a call to
1275 if (fdatap
->saved_fpr
== 0 && fdatap
->saved_gpr
== 0
1276 && fdatap
->lr_offset
== 0 && fdatap
->cr_offset
== 0)
1278 else if (fi
->prev
&& fi
->prev
->frame
)
1279 frame_addr
= fi
->prev
->frame
;
1281 frame_addr
= read_memory_addr (fi
->frame
, wordsize
);
1283 /* if != -1, fdatap->saved_fpr is the smallest number of saved_fpr.
1284 All fpr's from saved_fpr to fp31 are saved. */
1286 if (fdatap
->saved_fpr
>= 0)
1289 CORE_ADDR fpr_addr
= frame_addr
+ fdatap
->fpr_offset
;
1290 for (i
= fdatap
->saved_fpr
; i
< 32; i
++)
1292 fi
->saved_regs
[FP0_REGNUM
+ i
] = fpr_addr
;
1297 /* if != -1, fdatap->saved_gpr is the smallest number of saved_gpr.
1298 All gpr's from saved_gpr to gpr31 are saved. */
1300 if (fdatap
->saved_gpr
>= 0)
1303 CORE_ADDR gpr_addr
= frame_addr
+ fdatap
->gpr_offset
;
1304 for (i
= fdatap
->saved_gpr
; i
< 32; i
++)
1306 fi
->saved_regs
[i
] = gpr_addr
;
1307 gpr_addr
+= wordsize
;
1311 /* If != 0, fdatap->cr_offset is the offset from the frame that holds
1313 if (fdatap
->cr_offset
!= 0)
1314 fi
->saved_regs
[PPC_CR_REGNUM
] = frame_addr
+ fdatap
->cr_offset
;
1316 /* If != 0, fdatap->lr_offset is the offset from the frame that holds
1318 if (fdatap
->lr_offset
!= 0)
1319 fi
->saved_regs
[PPC_LR_REGNUM
] = frame_addr
+ fdatap
->lr_offset
;
1322 /* Return the address of a frame. This is the inital %sp value when the frame
1323 was first allocated. For functions calling alloca(), it might be saved in
1324 an alloca register. */
1327 frame_initial_stack_address (struct frame_info
*fi
)
1330 struct rs6000_framedata fdata
;
1331 struct frame_info
*callee_fi
;
1333 /* if the initial stack pointer (frame address) of this frame is known,
1336 if (fi
->extra_info
->initial_sp
)
1337 return fi
->extra_info
->initial_sp
;
1339 /* find out if this function is using an alloca register.. */
1341 (void) skip_prologue (get_pc_function_start (fi
->pc
), fi
->pc
, &fdata
);
1343 /* if saved registers of this frame are not known yet, read and cache them. */
1345 if (!fi
->saved_regs
)
1346 frame_get_saved_regs (fi
, &fdata
);
1348 /* If no alloca register used, then fi->frame is the value of the %sp for
1349 this frame, and it is good enough. */
1351 if (fdata
.alloca_reg
< 0)
1353 fi
->extra_info
->initial_sp
= fi
->frame
;
1354 return fi
->extra_info
->initial_sp
;
1357 /* This function has an alloca register. If this is the top-most frame
1358 (with the lowest address), the value in alloca register is good. */
1361 return fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1363 /* Otherwise, this is a caller frame. Callee has usually already saved
1364 registers, but there are exceptions (such as when the callee
1365 has no parameters). Find the address in which caller's alloca
1366 register is saved. */
1368 for (callee_fi
= fi
->next
; callee_fi
; callee_fi
= callee_fi
->next
)
1371 if (!callee_fi
->saved_regs
)
1372 frame_get_saved_regs (callee_fi
, NULL
);
1374 /* this is the address in which alloca register is saved. */
1376 tmpaddr
= callee_fi
->saved_regs
[fdata
.alloca_reg
];
1379 fi
->extra_info
->initial_sp
=
1380 read_memory_addr (tmpaddr
, TDEP
->wordsize
);
1381 return fi
->extra_info
->initial_sp
;
1384 /* Go look into deeper levels of the frame chain to see if any one of
1385 the callees has saved alloca register. */
1388 /* If alloca register was not saved, by the callee (or any of its callees)
1389 then the value in the register is still good. */
1391 fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1392 return fi
->extra_info
->initial_sp
;
1395 /* Describe the pointer in each stack frame to the previous stack frame
1398 /* FRAME_CHAIN takes a frame's nominal address
1399 and produces the frame's chain-pointer. */
1401 /* In the case of the RS/6000, the frame's nominal address
1402 is the address of a 4-byte word containing the calling frame's address. */
1405 rs6000_frame_chain (struct frame_info
*thisframe
)
1407 CORE_ADDR fp
, fpp
, lr
;
1408 int wordsize
= TDEP
->wordsize
;
1410 if (PC_IN_CALL_DUMMY (thisframe
->pc
, thisframe
->frame
, thisframe
->frame
))
1411 return thisframe
->frame
; /* dummy frame same as caller's frame */
1413 if (inside_entry_file (thisframe
->pc
) ||
1414 thisframe
->pc
== entry_point_address ())
1417 if (thisframe
->signal_handler_caller
)
1418 fp
= read_memory_addr (thisframe
->frame
+ SIG_FRAME_FP_OFFSET
,
1420 else if (thisframe
->next
!= NULL
1421 && thisframe
->next
->signal_handler_caller
1422 && FRAMELESS_FUNCTION_INVOCATION (thisframe
))
1423 /* A frameless function interrupted by a signal did not change the
1425 fp
= FRAME_FP (thisframe
);
1427 fp
= read_memory_addr ((thisframe
)->frame
, wordsize
);
1429 lr
= read_register (PPC_LR_REGNUM
);
1430 if (lr
== entry_point_address ())
1431 if (fp
!= 0 && (fpp
= read_memory_addr (fp
, wordsize
)) != 0)
1432 if (PC_IN_CALL_DUMMY (lr
, fpp
, fpp
))
1438 /* Return the size of register REG when words are WORDSIZE bytes long. If REG
1439 isn't available with that word size, return 0. */
1442 regsize (const struct reg
*reg
, int wordsize
)
1444 return wordsize
== 8 ? reg
->sz64
: reg
->sz32
;
1447 /* Return the name of register number N, or null if no such register exists
1448 in the current architecture. */
1451 rs6000_register_name (int n
)
1453 struct gdbarch_tdep
*tdep
= TDEP
;
1454 const struct reg
*reg
= tdep
->regs
+ n
;
1456 if (!regsize (reg
, tdep
->wordsize
))
1461 /* Index within `registers' of the first byte of the space for
1465 rs6000_register_byte (int n
)
1467 return TDEP
->regoff
[n
];
1470 /* Return the number of bytes of storage in the actual machine representation
1471 for register N if that register is available, else return 0. */
1474 rs6000_register_raw_size (int n
)
1476 struct gdbarch_tdep
*tdep
= TDEP
;
1477 const struct reg
*reg
= tdep
->regs
+ n
;
1478 return regsize (reg
, tdep
->wordsize
);
1481 /* Number of bytes of storage in the program's representation
1485 rs6000_register_virtual_size (int n
)
1487 return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (n
));
1490 /* Return the GDB type object for the "standard" data type
1491 of data in register N. */
1493 static struct type
*
1494 rs6000_register_virtual_type (int n
)
1496 struct gdbarch_tdep
*tdep
= TDEP
;
1497 const struct reg
*reg
= tdep
->regs
+ n
;
1499 return reg
->fpr
? builtin_type_double
:
1500 regsize (reg
, tdep
->wordsize
) == 8 ? builtin_type_int64
:
1504 /* For the PowerPC, it appears that the debug info marks float parameters as
1505 floats regardless of whether the function is prototyped, but the actual
1506 values are always passed in as doubles. Tell gdb to always assume that
1507 floats are passed as doubles and then converted in the callee. */
1510 rs6000_coerce_float_to_double (struct type
*formal
, struct type
*actual
)
1515 /* Return whether register N requires conversion when moving from raw format
1518 The register format for RS/6000 floating point registers is always
1519 double, we need a conversion if the memory format is float. */
1522 rs6000_register_convertible (int n
)
1524 const struct reg
*reg
= TDEP
->regs
+ n
;
1528 /* Convert data from raw format for register N in buffer FROM
1529 to virtual format with type TYPE in buffer TO. */
1532 rs6000_register_convert_to_virtual (int n
, struct type
*type
,
1533 char *from
, char *to
)
1535 if (TYPE_LENGTH (type
) != REGISTER_RAW_SIZE (n
))
1537 double val
= extract_floating (from
, REGISTER_RAW_SIZE (n
));
1538 store_floating (to
, TYPE_LENGTH (type
), val
);
1541 memcpy (to
, from
, REGISTER_RAW_SIZE (n
));
1544 /* Convert data from virtual format with type TYPE in buffer FROM
1545 to raw format for register N in buffer TO. */
1548 rs6000_register_convert_to_raw (struct type
*type
, int n
,
1549 char *from
, char *to
)
1551 if (TYPE_LENGTH (type
) != REGISTER_RAW_SIZE (n
))
1553 double val
= extract_floating (from
, TYPE_LENGTH (type
));
1554 store_floating (to
, REGISTER_RAW_SIZE (n
), val
);
1557 memcpy (to
, from
, REGISTER_RAW_SIZE (n
));
1560 /* Store the address of the place in which to copy the structure the
1561 subroutine will return. This is called from call_function.
1563 In RS/6000, struct return addresses are passed as an extra parameter in r3.
1564 In function return, callee is not responsible of returning this address
1565 back. Since gdb needs to find it, we will store in a designated variable
1566 `rs6000_struct_return_address'. */
1569 rs6000_store_struct_return (CORE_ADDR addr
, CORE_ADDR sp
)
1571 write_register (3, addr
);
1572 rs6000_struct_return_address
= addr
;
1575 /* Write into appropriate registers a function return value
1576 of type TYPE, given in virtual format. */
1579 rs6000_store_return_value (struct type
*type
, char *valbuf
)
1581 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
1583 /* Floating point values are returned starting from FPR1 and up.
1584 Say a double_double_double type could be returned in
1585 FPR1/FPR2/FPR3 triple. */
1587 write_register_bytes (REGISTER_BYTE (FP0_REGNUM
+ 1), valbuf
,
1588 TYPE_LENGTH (type
));
1590 /* Everything else is returned in GPR3 and up. */
1591 write_register_bytes (REGISTER_BYTE (PPC_GP0_REGNUM
+ 3), valbuf
,
1592 TYPE_LENGTH (type
));
1595 /* Extract from an array REGBUF containing the (raw) register state
1596 the address in which a function should return its structure value,
1597 as a CORE_ADDR (or an expression that can be used as one). */
1600 rs6000_extract_struct_value_address (char *regbuf
)
1602 return rs6000_struct_return_address
;
1605 /* Return whether PC is in a dummy function call.
1607 FIXME: This just checks for the end of the stack, which is broken
1608 for things like stepping through gcc nested function stubs. */
1611 rs6000_pc_in_call_dummy (CORE_ADDR pc
, CORE_ADDR sp
, CORE_ADDR fp
)
1613 return sp
< pc
&& pc
< fp
;
1616 /* Hook called when a new child process is started. */
1619 rs6000_create_inferior (int pid
)
1621 if (rs6000_set_host_arch_hook
)
1622 rs6000_set_host_arch_hook (pid
);
1625 /* Support for CONVERT_FROM_FUNC_PTR_ADDR(ADDR).
1627 Usually a function pointer's representation is simply the address
1628 of the function. On the RS/6000 however, a function pointer is
1629 represented by a pointer to a TOC entry. This TOC entry contains
1630 three words, the first word is the address of the function, the
1631 second word is the TOC pointer (r2), and the third word is the
1632 static chain value. Throughout GDB it is currently assumed that a
1633 function pointer contains the address of the function, which is not
1634 easy to fix. In addition, the conversion of a function address to
1635 a function pointer would require allocation of a TOC entry in the
1636 inferior's memory space, with all its drawbacks. To be able to
1637 call C++ virtual methods in the inferior (which are called via
1638 function pointers), find_function_addr uses this function to get the
1639 function address from a function pointer. */
1641 /* Return real function address if ADDR (a function pointer) is in the data
1642 space and is therefore a special function pointer. */
1645 rs6000_convert_from_func_ptr_addr (CORE_ADDR addr
)
1647 struct obj_section
*s
;
1649 s
= find_pc_section (addr
);
1650 if (s
&& s
->the_bfd_section
->flags
& SEC_CODE
)
1653 /* ADDR is in the data space, so it's a special function pointer. */
1654 return read_memory_addr (addr
, TDEP
->wordsize
);
1658 /* Handling the various POWER/PowerPC variants. */
1661 /* The arrays here called registers_MUMBLE hold information about available
1664 For each family of PPC variants, I've tried to isolate out the
1665 common registers and put them up front, so that as long as you get
1666 the general family right, GDB will correctly identify the registers
1667 common to that family. The common register sets are:
1669 For the 60x family: hid0 hid1 iabr dabr pir
1671 For the 505 and 860 family: eie eid nri
1673 For the 403 and 403GC: icdbdr esr dear evpr cdbcr tsr tcr pit tbhi
1674 tblo srr2 srr3 dbsr dbcr iac1 iac2 dac1 dac2 dccr iccr pbl1
1677 Most of these register groups aren't anything formal. I arrived at
1678 them by looking at the registers that occurred in more than one
1681 /* Convenience macros for populating register arrays. */
1683 /* Within another macro, convert S to a string. */
1687 /* Return a struct reg defining register NAME that's 32 bits on 32-bit systems
1688 and 64 bits on 64-bit systems. */
1689 #define R(name) { STR(name), 4, 8, 0 }
1691 /* Return a struct reg defining register NAME that's 32 bits on all
1693 #define R4(name) { STR(name), 4, 4, 0 }
1695 /* Return a struct reg defining register NAME that's 64 bits on all
1697 #define R8(name) { STR(name), 8, 8, 0 }
1699 /* Return a struct reg defining floating-point register NAME. */
1700 #define F(name) { STR(name), 8, 8, 1 }
1702 /* Return a struct reg defining register NAME that's 32 bits on 32-bit
1703 systems and that doesn't exist on 64-bit systems. */
1704 #define R32(name) { STR(name), 4, 0, 0 }
1706 /* Return a struct reg defining register NAME that's 64 bits on 64-bit
1707 systems and that doesn't exist on 32-bit systems. */
1708 #define R64(name) { STR(name), 0, 8, 0 }
1710 /* Return a struct reg placeholder for a register that doesn't exist. */
1711 #define R0 { 0, 0, 0, 0 }
1713 /* UISA registers common across all architectures, including POWER. */
1715 #define COMMON_UISA_REGS \
1716 /* 0 */ R(r0), R(r1), R(r2), R(r3), R(r4), R(r5), R(r6), R(r7), \
1717 /* 8 */ R(r8), R(r9), R(r10),R(r11),R(r12),R(r13),R(r14),R(r15), \
1718 /* 16 */ R(r16),R(r17),R(r18),R(r19),R(r20),R(r21),R(r22),R(r23), \
1719 /* 24 */ R(r24),R(r25),R(r26),R(r27),R(r28),R(r29),R(r30),R(r31), \
1720 /* 32 */ F(f0), F(f1), F(f2), F(f3), F(f4), F(f5), F(f6), F(f7), \
1721 /* 40 */ F(f8), F(f9), F(f10),F(f11),F(f12),F(f13),F(f14),F(f15), \
1722 /* 48 */ F(f16),F(f17),F(f18),F(f19),F(f20),F(f21),F(f22),F(f23), \
1723 /* 56 */ F(f24),F(f25),F(f26),F(f27),F(f28),F(f29),F(f30),F(f31), \
1724 /* 64 */ R(pc), R(ps)
1726 /* UISA-level SPRs for PowerPC. */
1727 #define PPC_UISA_SPRS \
1728 /* 66 */ R4(cr), R(lr), R(ctr), R4(xer), R0
1730 /* Segment registers, for PowerPC. */
1731 #define PPC_SEGMENT_REGS \
1732 /* 71 */ R32(sr0), R32(sr1), R32(sr2), R32(sr3), \
1733 /* 75 */ R32(sr4), R32(sr5), R32(sr6), R32(sr7), \
1734 /* 79 */ R32(sr8), R32(sr9), R32(sr10), R32(sr11), \
1735 /* 83 */ R32(sr12), R32(sr13), R32(sr14), R32(sr15)
1737 /* OEA SPRs for PowerPC. */
1738 #define PPC_OEA_SPRS \
1740 /* 88 */ R(ibat0u), R(ibat0l), R(ibat1u), R(ibat1l), \
1741 /* 92 */ R(ibat2u), R(ibat2l), R(ibat3u), R(ibat3l), \
1742 /* 96 */ R(dbat0u), R(dbat0l), R(dbat1u), R(dbat1l), \
1743 /* 100 */ R(dbat2u), R(dbat2l), R(dbat3u), R(dbat3l), \
1744 /* 104 */ R(sdr1), R64(asr), R(dar), R4(dsisr), \
1745 /* 108 */ R(sprg0), R(sprg1), R(sprg2), R(sprg3), \
1746 /* 112 */ R(srr0), R(srr1), R(tbl), R(tbu), \
1747 /* 116 */ R4(dec), R(dabr), R4(ear)
1749 /* IBM POWER (pre-PowerPC) architecture, user-level view. We only cover
1750 user-level SPR's. */
1751 static const struct reg registers_power
[] =
1754 /* 66 */ R4(cnd
), R(lr
), R(cnt
), R4(xer
), R4(mq
)
1757 /* PowerPC UISA - a PPC processor as viewed by user-level code. A UISA-only
1758 view of the PowerPC. */
1759 static const struct reg registers_powerpc
[] =
1765 /* IBM PowerPC 403. */
1766 static const struct reg registers_403
[] =
1772 /* 119 */ R(icdbdr
), R(esr
), R(dear
), R(evpr
),
1773 /* 123 */ R(cdbcr
), R(tsr
), R(tcr
), R(pit
),
1774 /* 127 */ R(tbhi
), R(tblo
), R(srr2
), R(srr3
),
1775 /* 131 */ R(dbsr
), R(dbcr
), R(iac1
), R(iac2
),
1776 /* 135 */ R(dac1
), R(dac2
), R(dccr
), R(iccr
),
1777 /* 139 */ R(pbl1
), R(pbu1
), R(pbl2
), R(pbu2
)
1780 /* IBM PowerPC 403GC. */
1781 static const struct reg registers_403GC
[] =
1787 /* 119 */ R(icdbdr
), R(esr
), R(dear
), R(evpr
),
1788 /* 123 */ R(cdbcr
), R(tsr
), R(tcr
), R(pit
),
1789 /* 127 */ R(tbhi
), R(tblo
), R(srr2
), R(srr3
),
1790 /* 131 */ R(dbsr
), R(dbcr
), R(iac1
), R(iac2
),
1791 /* 135 */ R(dac1
), R(dac2
), R(dccr
), R(iccr
),
1792 /* 139 */ R(pbl1
), R(pbu1
), R(pbl2
), R(pbu2
),
1793 /* 143 */ R(zpr
), R(pid
), R(sgr
), R(dcwr
),
1794 /* 147 */ R(tbhu
), R(tblu
)
1797 /* Motorola PowerPC 505. */
1798 static const struct reg registers_505
[] =
1804 /* 119 */ R(eie
), R(eid
), R(nri
)
1807 /* Motorola PowerPC 860 or 850. */
1808 static const struct reg registers_860
[] =
1814 /* 119 */ R(eie
), R(eid
), R(nri
), R(cmpa
),
1815 /* 123 */ R(cmpb
), R(cmpc
), R(cmpd
), R(icr
),
1816 /* 127 */ R(der
), R(counta
), R(countb
), R(cmpe
),
1817 /* 131 */ R(cmpf
), R(cmpg
), R(cmph
), R(lctrl1
),
1818 /* 135 */ R(lctrl2
), R(ictrl
), R(bar
), R(ic_cst
),
1819 /* 139 */ R(ic_adr
), R(ic_dat
), R(dc_cst
), R(dc_adr
),
1820 /* 143 */ R(dc_dat
), R(dpdr
), R(dpir
), R(immr
),
1821 /* 147 */ R(mi_ctr
), R(mi_ap
), R(mi_epn
), R(mi_twc
),
1822 /* 151 */ R(mi_rpn
), R(md_ctr
), R(m_casid
), R(md_ap
),
1823 /* 155 */ R(md_epn
), R(md_twb
), R(md_twc
), R(md_rpn
),
1824 /* 159 */ R(m_tw
), R(mi_dbcam
), R(mi_dbram0
), R(mi_dbram1
),
1825 /* 163 */ R(md_dbcam
), R(md_dbram0
), R(md_dbram1
)
1828 /* Motorola PowerPC 601. Note that the 601 has different register numbers
1829 for reading and writing RTCU and RTCL. However, how one reads and writes a
1830 register is the stub's problem. */
1831 static const struct reg registers_601
[] =
1837 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1838 /* 123 */ R(pir
), R(mq
), R(rtcu
), R(rtcl
)
1841 /* Motorola PowerPC 602. */
1842 static const struct reg registers_602
[] =
1848 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R0
,
1849 /* 123 */ R0
, R(tcr
), R(ibr
), R(esassr
),
1850 /* 127 */ R(sebr
), R(ser
), R(sp
), R(lt
)
1853 /* Motorola/IBM PowerPC 603 or 603e. */
1854 static const struct reg registers_603
[] =
1860 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R0
,
1861 /* 123 */ R0
, R(dmiss
), R(dcmp
), R(hash1
),
1862 /* 127 */ R(hash2
), R(imiss
), R(icmp
), R(rpa
)
1865 /* Motorola PowerPC 604 or 604e. */
1866 static const struct reg registers_604
[] =
1872 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1873 /* 123 */ R(pir
), R(mmcr0
), R(pmc1
), R(pmc2
),
1874 /* 127 */ R(sia
), R(sda
)
1877 /* Motorola/IBM PowerPC 750 or 740. */
1878 static const struct reg registers_750
[] =
1884 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1885 /* 123 */ R0
, R(ummcr0
), R(upmc1
), R(upmc2
),
1886 /* 127 */ R(usia
), R(ummcr1
), R(upmc3
), R(upmc4
),
1887 /* 131 */ R(mmcr0
), R(pmc1
), R(pmc2
), R(sia
),
1888 /* 135 */ R(mmcr1
), R(pmc3
), R(pmc4
), R(l2cr
),
1889 /* 139 */ R(ictc
), R(thrm1
), R(thrm2
), R(thrm3
)
1893 /* Information about a particular processor variant. */
1897 /* Name of this variant. */
1900 /* English description of the variant. */
1903 /* bfd_arch_info.arch corresponding to variant. */
1904 enum bfd_architecture arch
;
1906 /* bfd_arch_info.mach corresponding to variant. */
1909 /* Table of register names; registers[R] is the name of the register
1912 const struct reg
*regs
;
1915 #define num_registers(list) (sizeof (list) / sizeof((list)[0]))
1918 /* Information in this table comes from the following web sites:
1919 IBM: http://www.chips.ibm.com:80/products/embedded/
1920 Motorola: http://www.mot.com/SPS/PowerPC/
1922 I'm sure I've got some of the variant descriptions not quite right.
1923 Please report any inaccuracies you find to GDB's maintainer.
1925 If you add entries to this table, please be sure to allow the new
1926 value as an argument to the --with-cpu flag, in configure.in. */
1928 static const struct variant variants
[] =
1930 {"powerpc", "PowerPC user-level", bfd_arch_powerpc
,
1931 bfd_mach_ppc
, num_registers (registers_powerpc
), registers_powerpc
},
1932 {"power", "POWER user-level", bfd_arch_rs6000
,
1933 bfd_mach_rs6k
, num_registers (registers_power
), registers_power
},
1934 {"403", "IBM PowerPC 403", bfd_arch_powerpc
,
1935 bfd_mach_ppc_403
, num_registers (registers_403
), registers_403
},
1936 {"601", "Motorola PowerPC 601", bfd_arch_powerpc
,
1937 bfd_mach_ppc_601
, num_registers (registers_601
), registers_601
},
1938 {"602", "Motorola PowerPC 602", bfd_arch_powerpc
,
1939 bfd_mach_ppc_602
, num_registers (registers_602
), registers_602
},
1940 {"603", "Motorola/IBM PowerPC 603 or 603e", bfd_arch_powerpc
,
1941 bfd_mach_ppc_603
, num_registers (registers_603
), registers_603
},
1942 {"604", "Motorola PowerPC 604 or 604e", bfd_arch_powerpc
,
1943 604, num_registers (registers_604
), registers_604
},
1944 {"403GC", "IBM PowerPC 403GC", bfd_arch_powerpc
,
1945 bfd_mach_ppc_403gc
, num_registers (registers_403GC
), registers_403GC
},
1946 {"505", "Motorola PowerPC 505", bfd_arch_powerpc
,
1947 bfd_mach_ppc_505
, num_registers (registers_505
), registers_505
},
1948 {"860", "Motorola PowerPC 860 or 850", bfd_arch_powerpc
,
1949 bfd_mach_ppc_860
, num_registers (registers_860
), registers_860
},
1950 {"750", "Motorola/IBM PowerPC 750 or 740", bfd_arch_powerpc
,
1951 bfd_mach_ppc_750
, num_registers (registers_750
), registers_750
},
1953 /* FIXME: I haven't checked the register sets of the following. */
1954 {"620", "Motorola PowerPC 620", bfd_arch_powerpc
,
1955 bfd_mach_ppc_620
, num_registers (registers_powerpc
), registers_powerpc
},
1956 {"a35", "PowerPC A35", bfd_arch_powerpc
,
1957 bfd_mach_ppc_a35
, num_registers (registers_powerpc
), registers_powerpc
},
1958 {"rs1", "IBM POWER RS1", bfd_arch_rs6000
,
1959 bfd_mach_rs6k_rs1
, num_registers (registers_power
), registers_power
},
1960 {"rsc", "IBM POWER RSC", bfd_arch_rs6000
,
1961 bfd_mach_rs6k_rsc
, num_registers (registers_power
), registers_power
},
1962 {"rs2", "IBM POWER RS2", bfd_arch_rs6000
,
1963 bfd_mach_rs6k_rs2
, num_registers (registers_power
), registers_power
},
1968 #undef num_registers
1970 /* Look up the variant named NAME in the `variants' table. Return a
1971 pointer to the struct variant, or null if we couldn't find it. */
1973 static const struct variant
*
1974 find_variant_by_name (char *name
)
1976 const struct variant
*v
;
1978 for (v
= variants
; v
->name
; v
++)
1979 if (!strcmp (name
, v
->name
))
1985 /* Return the variant corresponding to architecture ARCH and machine number
1986 MACH. If no such variant exists, return null. */
1988 static const struct variant
*
1989 find_variant_by_arch (enum bfd_architecture arch
, unsigned long mach
)
1991 const struct variant
*v
;
1993 for (v
= variants
; v
->name
; v
++)
1994 if (arch
== v
->arch
&& mach
== v
->mach
)
2004 process_note_abi_tag_sections (bfd
*abfd
, asection
*sect
, void *obj
)
2006 int *os_ident_ptr
= obj
;
2008 unsigned int sectsize
;
2010 name
= bfd_get_section_name (abfd
, sect
);
2011 sectsize
= bfd_section_size (abfd
, sect
);
2012 if (strcmp (name
, ".note.ABI-tag") == 0 && sectsize
> 0)
2014 unsigned int name_length
, data_length
, note_type
;
2015 char *note
= alloca (sectsize
);
2017 bfd_get_section_contents (abfd
, sect
, note
,
2018 (file_ptr
) 0, (bfd_size_type
) sectsize
);
2020 name_length
= bfd_h_get_32 (abfd
, note
);
2021 data_length
= bfd_h_get_32 (abfd
, note
+ 4);
2022 note_type
= bfd_h_get_32 (abfd
, note
+ 8);
2024 if (name_length
== 4 && data_length
== 16 && note_type
== 1
2025 && strcmp (note
+ 12, "GNU") == 0)
2027 int os_number
= bfd_h_get_32 (abfd
, note
+ 16);
2029 /* The case numbers are from abi-tags in glibc */
2033 *os_ident_ptr
= ELFOSABI_LINUX
;
2036 *os_ident_ptr
= ELFOSABI_HURD
;
2039 *os_ident_ptr
= ELFOSABI_SOLARIS
;
2043 "process_note_abi_sections: unknown OS number %d", os_number
);
2050 /* Return one of the ELFOSABI_ constants for BFDs representing ELF
2051 executables. If it's not an ELF executable or if the OS/ABI couldn't
2052 be determined, simply return -1. */
2055 get_elfosabi (bfd
*abfd
)
2059 if (abfd
!= NULL
&& bfd_get_flavour (abfd
) == bfd_target_elf_flavour
)
2061 elfosabi
= elf_elfheader (abfd
)->e_ident
[EI_OSABI
];
2063 /* When elfosabi is 0 (ELFOSABI_NONE), this is supposed to indicate
2064 that we're on a SYSV system. However, GNU/Linux uses a note section
2065 to record OS/ABI info, but leaves e_ident[EI_OSABI] zero. So we
2066 have to check the note sections too. */
2069 bfd_map_over_sections (abfd
,
2070 process_note_abi_tag_sections
,
2080 /* Initialize the current architecture based on INFO. If possible, re-use an
2081 architecture from ARCHES, which is a list of architectures already created
2082 during this debugging session.
2084 Called e.g. at program startup, when reading a core file, and when reading
2087 static struct gdbarch
*
2088 rs6000_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
2090 struct gdbarch
*gdbarch
;
2091 struct gdbarch_tdep
*tdep
;
2092 int wordsize
, from_xcoff_exec
, from_elf_exec
, power
, i
, off
;
2094 const struct variant
*v
;
2095 enum bfd_architecture arch
;
2098 int osabi
, sysv_abi
;
2100 from_xcoff_exec
= info
.abfd
&& info
.abfd
->format
== bfd_object
&&
2101 bfd_get_flavour (info
.abfd
) == bfd_target_xcoff_flavour
;
2103 from_elf_exec
= info
.abfd
&& info
.abfd
->format
== bfd_object
&&
2104 bfd_get_flavour (info
.abfd
) == bfd_target_elf_flavour
;
2106 sysv_abi
= info
.abfd
&& bfd_get_flavour (info
.abfd
) == bfd_target_elf_flavour
;
2108 osabi
= get_elfosabi (info
.abfd
);
2110 /* Check word size. If INFO is from a binary file, infer it from that,
2111 else use the previously-inferred size. */
2112 if (from_xcoff_exec
)
2114 if (xcoff_data (info
.abfd
)->xcoff64
)
2119 else if (from_elf_exec
)
2121 if (elf_elfheader (info
.abfd
)->e_ident
[EI_CLASS
] == ELFCLASS64
)
2130 wordsize
= tdep
->wordsize
;
2135 /* Find a candidate among extant architectures. */
2136 for (arches
= gdbarch_list_lookup_by_info (arches
, &info
);
2138 arches
= gdbarch_list_lookup_by_info (arches
->next
, &info
))
2140 /* Word size in the various PowerPC bfd_arch_info structs isn't
2141 meaningful, because 64-bit CPUs can run in 32-bit mode. So, perform
2142 separate word size check. */
2143 tdep
= gdbarch_tdep (arches
->gdbarch
);
2144 if (tdep
&& tdep
->wordsize
== wordsize
&& tdep
->osabi
== osabi
)
2145 return arches
->gdbarch
;
2148 /* None found, create a new architecture from INFO, whose bfd_arch_info
2149 validity depends on the source:
2150 - executable useless
2151 - rs6000_host_arch() good
2153 - "set arch" trust blindly
2154 - GDB startup useless but harmless */
2156 if (!from_xcoff_exec
)
2158 arch
= info
.bfd_architecture
;
2159 mach
= info
.bfd_arch_info
->mach
;
2163 arch
= bfd_arch_powerpc
;
2165 bfd_default_set_arch_mach (&abfd
, arch
, mach
);
2166 info
.bfd_arch_info
= bfd_get_arch_info (&abfd
);
2168 tdep
= xmalloc (sizeof (struct gdbarch_tdep
));
2169 tdep
->wordsize
= wordsize
;
2170 tdep
->osabi
= osabi
;
2171 gdbarch
= gdbarch_alloc (&info
, tdep
);
2172 power
= arch
== bfd_arch_rs6000
;
2174 /* Select instruction printer. */
2175 tm_print_insn
= arch
== power
? print_insn_rs6000
:
2176 info
.byte_order
== BIG_ENDIAN
? print_insn_big_powerpc
:
2177 print_insn_little_powerpc
;
2179 /* Choose variant. */
2180 v
= find_variant_by_arch (arch
, mach
);
2182 v
= find_variant_by_name (power
? "power" : "powerpc");
2183 tdep
->regs
= v
->regs
;
2185 /* Calculate byte offsets in raw register array. */
2186 tdep
->regoff
= xmalloc (v
->nregs
* sizeof (int));
2187 for (i
= off
= 0; i
< v
->nregs
; i
++)
2189 tdep
->regoff
[i
] = off
;
2190 off
+= regsize (v
->regs
+ i
, wordsize
);
2193 set_gdbarch_read_pc (gdbarch
, generic_target_read_pc
);
2194 set_gdbarch_write_pc (gdbarch
, generic_target_write_pc
);
2195 set_gdbarch_read_fp (gdbarch
, generic_target_read_fp
);
2196 set_gdbarch_write_fp (gdbarch
, generic_target_write_fp
);
2197 set_gdbarch_read_sp (gdbarch
, generic_target_read_sp
);
2198 set_gdbarch_write_sp (gdbarch
, generic_target_write_sp
);
2200 set_gdbarch_num_regs (gdbarch
, v
->nregs
);
2201 set_gdbarch_sp_regnum (gdbarch
, 1);
2202 set_gdbarch_fp_regnum (gdbarch
, 1);
2203 set_gdbarch_pc_regnum (gdbarch
, 64);
2204 set_gdbarch_register_name (gdbarch
, rs6000_register_name
);
2205 set_gdbarch_register_size (gdbarch
, wordsize
);
2206 set_gdbarch_register_bytes (gdbarch
, off
);
2207 set_gdbarch_register_byte (gdbarch
, rs6000_register_byte
);
2208 set_gdbarch_register_raw_size (gdbarch
, rs6000_register_raw_size
);
2209 set_gdbarch_max_register_raw_size (gdbarch
, 8);
2210 set_gdbarch_register_virtual_size (gdbarch
, rs6000_register_virtual_size
);
2211 set_gdbarch_max_register_virtual_size (gdbarch
, 8);
2212 set_gdbarch_register_virtual_type (gdbarch
, rs6000_register_virtual_type
);
2214 set_gdbarch_ptr_bit (gdbarch
, wordsize
* TARGET_CHAR_BIT
);
2215 set_gdbarch_short_bit (gdbarch
, 2 * TARGET_CHAR_BIT
);
2216 set_gdbarch_int_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
2217 set_gdbarch_long_bit (gdbarch
, wordsize
* TARGET_CHAR_BIT
);
2218 set_gdbarch_long_long_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2219 set_gdbarch_float_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
2220 set_gdbarch_double_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2221 set_gdbarch_long_double_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2223 set_gdbarch_use_generic_dummy_frames (gdbarch
, 1);
2224 set_gdbarch_call_dummy_length (gdbarch
, 0);
2225 set_gdbarch_call_dummy_location (gdbarch
, AT_ENTRY_POINT
);
2226 set_gdbarch_call_dummy_address (gdbarch
, entry_point_address
);
2227 set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch
, 1);
2228 set_gdbarch_call_dummy_breakpoint_offset (gdbarch
, 0);
2229 set_gdbarch_call_dummy_start_offset (gdbarch
, 0);
2230 set_gdbarch_pc_in_call_dummy (gdbarch
, generic_pc_in_call_dummy
);
2231 set_gdbarch_call_dummy_p (gdbarch
, 1);
2232 set_gdbarch_call_dummy_stack_adjust_p (gdbarch
, 0);
2233 set_gdbarch_get_saved_register (gdbarch
, generic_get_saved_register
);
2234 set_gdbarch_fix_call_dummy (gdbarch
, rs6000_fix_call_dummy
);
2235 set_gdbarch_push_dummy_frame (gdbarch
, generic_push_dummy_frame
);
2236 set_gdbarch_save_dummy_frame_tos (gdbarch
, generic_save_dummy_frame_tos
);
2237 set_gdbarch_push_return_address (gdbarch
, ppc_push_return_address
);
2238 set_gdbarch_believe_pcc_promotion (gdbarch
, 1);
2239 set_gdbarch_coerce_float_to_double (gdbarch
, rs6000_coerce_float_to_double
);
2241 set_gdbarch_register_convertible (gdbarch
, rs6000_register_convertible
);
2242 set_gdbarch_register_convert_to_virtual (gdbarch
, rs6000_register_convert_to_virtual
);
2243 set_gdbarch_register_convert_to_raw (gdbarch
, rs6000_register_convert_to_raw
);
2245 set_gdbarch_extract_return_value (gdbarch
, rs6000_extract_return_value
);
2248 set_gdbarch_push_arguments (gdbarch
, ppc_sysv_abi_push_arguments
);
2250 set_gdbarch_push_arguments (gdbarch
, rs6000_push_arguments
);
2252 set_gdbarch_store_struct_return (gdbarch
, rs6000_store_struct_return
);
2253 set_gdbarch_store_return_value (gdbarch
, rs6000_store_return_value
);
2254 set_gdbarch_extract_struct_value_address (gdbarch
, rs6000_extract_struct_value_address
);
2255 set_gdbarch_use_struct_convention (gdbarch
, generic_use_struct_convention
);
2257 set_gdbarch_pop_frame (gdbarch
, rs6000_pop_frame
);
2259 set_gdbarch_skip_prologue (gdbarch
, rs6000_skip_prologue
);
2260 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
2261 set_gdbarch_decr_pc_after_break (gdbarch
, 0);
2262 set_gdbarch_function_start_offset (gdbarch
, 0);
2263 set_gdbarch_breakpoint_from_pc (gdbarch
, rs6000_breakpoint_from_pc
);
2265 /* Not sure on this. FIXMEmgo */
2266 set_gdbarch_frame_args_skip (gdbarch
, 8);
2268 set_gdbarch_frame_chain_valid (gdbarch
, file_frame_chain_valid
);
2269 if (osabi
== ELFOSABI_LINUX
)
2271 set_gdbarch_frameless_function_invocation (gdbarch
,
2272 ppc_linux_frameless_function_invocation
);
2273 set_gdbarch_frame_chain (gdbarch
, ppc_linux_frame_chain
);
2274 set_gdbarch_frame_saved_pc (gdbarch
, ppc_linux_frame_saved_pc
);
2276 set_gdbarch_frame_init_saved_regs (gdbarch
,
2277 ppc_linux_frame_init_saved_regs
);
2278 set_gdbarch_init_extra_frame_info (gdbarch
,
2279 ppc_linux_init_extra_frame_info
);
2281 set_gdbarch_memory_remove_breakpoint (gdbarch
,
2282 ppc_linux_memory_remove_breakpoint
);
2286 set_gdbarch_frameless_function_invocation (gdbarch
,
2287 rs6000_frameless_function_invocation
);
2288 set_gdbarch_frame_chain (gdbarch
, rs6000_frame_chain
);
2289 set_gdbarch_frame_saved_pc (gdbarch
, rs6000_frame_saved_pc
);
2291 set_gdbarch_frame_init_saved_regs (gdbarch
, rs6000_frame_init_saved_regs
);
2292 set_gdbarch_init_extra_frame_info (gdbarch
, rs6000_init_extra_frame_info
);
2294 /* Handle RS/6000 function pointers. */
2295 set_gdbarch_convert_from_func_ptr_addr (gdbarch
,
2296 rs6000_convert_from_func_ptr_addr
);
2298 set_gdbarch_frame_args_address (gdbarch
, rs6000_frame_args_address
);
2299 set_gdbarch_frame_locals_address (gdbarch
, rs6000_frame_args_address
);
2300 set_gdbarch_saved_pc_after_call (gdbarch
, rs6000_saved_pc_after_call
);
2302 /* We can't tell how many args there are
2303 now that the C compiler delays popping them. */
2304 set_gdbarch_frame_num_args (gdbarch
, frame_num_args_unknown
);
2309 /* Initialization code. */
2312 _initialize_rs6000_tdep (void)
2314 register_gdbarch_init (bfd_arch_rs6000
, rs6000_gdbarch_init
);
2315 register_gdbarch_init (bfd_arch_powerpc
, rs6000_gdbarch_init
);