1 /* Target-dependent code for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
32 #include "arch-utils.h"
37 #include "bfd/libbfd.h" /* for bfd_default_set_arch_mach */
38 #include "coff/internal.h" /* for libcoff.h */
39 #include "bfd/libcoff.h" /* for xcoff_data */
45 /* If the kernel has to deliver a signal, it pushes a sigcontext
46 structure on the stack and then calls the signal handler, passing
47 the address of the sigcontext in an argument register. Usually
48 the signal handler doesn't save this register, so we have to
49 access the sigcontext structure via an offset from the signal handler
51 The following constants were determined by experimentation on AIX 3.2. */
52 #define SIG_FRAME_PC_OFFSET 96
53 #define SIG_FRAME_LR_OFFSET 108
54 #define SIG_FRAME_FP_OFFSET 284
56 /* To be used by skip_prologue. */
58 struct rs6000_framedata
60 int offset
; /* total size of frame --- the distance
61 by which we decrement sp to allocate
63 int saved_gpr
; /* smallest # of saved gpr */
64 int saved_fpr
; /* smallest # of saved fpr */
65 int alloca_reg
; /* alloca register number (frame ptr) */
66 char frameless
; /* true if frameless functions. */
67 char nosavedpc
; /* true if pc not saved. */
68 int gpr_offset
; /* offset of saved gprs from prev sp */
69 int fpr_offset
; /* offset of saved fprs from prev sp */
70 int lr_offset
; /* offset of saved lr */
71 int cr_offset
; /* offset of saved cr */
74 /* Description of a single register. */
78 char *name
; /* name of register */
79 unsigned char sz32
; /* size on 32-bit arch, 0 if nonextant */
80 unsigned char sz64
; /* size on 64-bit arch, 0 if nonextant */
81 unsigned char fpr
; /* whether register is floating-point */
84 /* Private data that this module attaches to struct gdbarch. */
88 int wordsize
; /* size in bytes of fixed-point word */
89 int osabi
; /* OS / ABI from ELF header */
90 int *regoff
; /* byte offsets in register arrays */
91 const struct reg
*regs
; /* from current variant */
94 /* Return the current architecture's gdbarch_tdep structure. */
96 #define TDEP gdbarch_tdep (current_gdbarch)
98 /* Breakpoint shadows for the single step instructions will be kept here. */
100 static struct sstep_breaks
102 /* Address, or 0 if this is not in use. */
104 /* Shadow contents. */
109 /* Hook for determining the TOC address when calling functions in the
110 inferior under AIX. The initialization code in rs6000-nat.c sets
111 this hook to point to find_toc_address. */
113 CORE_ADDR (*rs6000_find_toc_address_hook
) (CORE_ADDR
) = NULL
;
115 /* Hook to set the current architecture when starting a child process.
116 rs6000-nat.c sets this. */
118 void (*rs6000_set_host_arch_hook
) (int) = NULL
;
120 /* Static function prototypes */
122 static CORE_ADDR
branch_dest (int opcode
, int instr
, CORE_ADDR pc
,
124 static CORE_ADDR
skip_prologue (CORE_ADDR
, CORE_ADDR
,
125 struct rs6000_framedata
*);
126 static void frame_get_saved_regs (struct frame_info
* fi
,
127 struct rs6000_framedata
* fdatap
);
128 static CORE_ADDR
frame_initial_stack_address (struct frame_info
*);
130 /* Read a LEN-byte address from debugged memory address MEMADDR. */
133 read_memory_addr (CORE_ADDR memaddr
, int len
)
135 return read_memory_unsigned_integer (memaddr
, len
);
139 rs6000_skip_prologue (CORE_ADDR pc
)
141 struct rs6000_framedata frame
;
142 pc
= skip_prologue (pc
, 0, &frame
);
147 /* Fill in fi->saved_regs */
149 struct frame_extra_info
151 /* Functions calling alloca() change the value of the stack
152 pointer. We need to use initial stack pointer (which is saved in
153 r31 by gcc) in such cases. If a compiler emits traceback table,
154 then we should use the alloca register specified in traceback
156 CORE_ADDR initial_sp
; /* initial stack pointer. */
160 rs6000_init_extra_frame_info (int fromleaf
, struct frame_info
*fi
)
162 fi
->extra_info
= (struct frame_extra_info
*)
163 frame_obstack_alloc (sizeof (struct frame_extra_info
));
164 fi
->extra_info
->initial_sp
= 0;
165 if (fi
->next
!= (CORE_ADDR
) 0
166 && fi
->pc
< TEXT_SEGMENT_BASE
)
167 /* We're in get_prev_frame */
168 /* and this is a special signal frame. */
169 /* (fi->pc will be some low address in the kernel, */
170 /* to which the signal handler returns). */
171 fi
->signal_handler_caller
= 1;
174 /* Put here the code to store, into a struct frame_saved_regs,
175 the addresses of the saved registers of frame described by FRAME_INFO.
176 This includes special registers such as pc and fp saved in special
177 ways in the stack frame. sp is even more special:
178 the address we return for it IS the sp for the next frame. */
180 /* In this implementation for RS/6000, we do *not* save sp. I am
181 not sure if it will be needed. The following function takes care of gpr's
185 rs6000_frame_init_saved_regs (struct frame_info
*fi
)
187 frame_get_saved_regs (fi
, NULL
);
191 rs6000_frame_args_address (struct frame_info
*fi
)
193 if (fi
->extra_info
->initial_sp
!= 0)
194 return fi
->extra_info
->initial_sp
;
196 return frame_initial_stack_address (fi
);
199 /* Immediately after a function call, return the saved pc.
200 Can't go through the frames for this because on some machines
201 the new frame is not set up until the new function executes
202 some instructions. */
205 rs6000_saved_pc_after_call (struct frame_info
*fi
)
207 return read_register (PPC_LR_REGNUM
);
210 /* Calculate the destination of a branch/jump. Return -1 if not a branch. */
213 branch_dest (int opcode
, int instr
, CORE_ADDR pc
, CORE_ADDR safety
)
220 absolute
= (int) ((instr
>> 1) & 1);
225 immediate
= ((instr
& ~3) << 6) >> 6; /* br unconditional */
229 dest
= pc
+ immediate
;
233 immediate
= ((instr
& ~3) << 16) >> 16; /* br conditional */
237 dest
= pc
+ immediate
;
241 ext_op
= (instr
>> 1) & 0x3ff;
243 if (ext_op
== 16) /* br conditional register */
245 dest
= read_register (PPC_LR_REGNUM
) & ~3;
247 /* If we are about to return from a signal handler, dest is
248 something like 0x3c90. The current frame is a signal handler
249 caller frame, upon completion of the sigreturn system call
250 execution will return to the saved PC in the frame. */
251 if (dest
< TEXT_SEGMENT_BASE
)
253 struct frame_info
*fi
;
255 fi
= get_current_frame ();
257 dest
= read_memory_addr (fi
->frame
+ SIG_FRAME_PC_OFFSET
,
262 else if (ext_op
== 528) /* br cond to count reg */
264 dest
= read_register (PPC_CTR_REGNUM
) & ~3;
266 /* If we are about to execute a system call, dest is something
267 like 0x22fc or 0x3b00. Upon completion the system call
268 will return to the address in the link register. */
269 if (dest
< TEXT_SEGMENT_BASE
)
270 dest
= read_register (PPC_LR_REGNUM
) & ~3;
279 return (dest
< TEXT_SEGMENT_BASE
) ? safety
: dest
;
283 /* Sequence of bytes for breakpoint instruction. */
285 #define BIG_BREAKPOINT { 0x7d, 0x82, 0x10, 0x08 }
286 #define LITTLE_BREAKPOINT { 0x08, 0x10, 0x82, 0x7d }
288 static unsigned char *
289 rs6000_breakpoint_from_pc (CORE_ADDR
*bp_addr
, int *bp_size
)
291 static unsigned char big_breakpoint
[] = BIG_BREAKPOINT
;
292 static unsigned char little_breakpoint
[] = LITTLE_BREAKPOINT
;
294 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
)
295 return big_breakpoint
;
297 return little_breakpoint
;
301 /* AIX does not support PT_STEP. Simulate it. */
304 rs6000_software_single_step (enum target_signal signal
,
305 int insert_breakpoints_p
)
307 #define INSNLEN(OPCODE) 4
309 static char le_breakp
[] = LITTLE_BREAKPOINT
;
310 static char be_breakp
[] = BIG_BREAKPOINT
;
311 char *breakp
= TARGET_BYTE_ORDER
== BIG_ENDIAN
? be_breakp
: le_breakp
;
317 if (insert_breakpoints_p
)
322 insn
= read_memory_integer (loc
, 4);
324 breaks
[0] = loc
+ INSNLEN (insn
);
326 breaks
[1] = branch_dest (opcode
, insn
, loc
, breaks
[0]);
328 /* Don't put two breakpoints on the same address. */
329 if (breaks
[1] == breaks
[0])
332 stepBreaks
[1].address
= 0;
334 for (ii
= 0; ii
< 2; ++ii
)
337 /* ignore invalid breakpoint. */
338 if (breaks
[ii
] == -1)
341 read_memory (breaks
[ii
], stepBreaks
[ii
].data
, 4);
343 write_memory (breaks
[ii
], breakp
, 4);
344 stepBreaks
[ii
].address
= breaks
[ii
];
351 /* remove step breakpoints. */
352 for (ii
= 0; ii
< 2; ++ii
)
353 if (stepBreaks
[ii
].address
!= 0)
355 (stepBreaks
[ii
].address
, stepBreaks
[ii
].data
, 4);
358 errno
= 0; /* FIXME, don't ignore errors! */
359 /* What errors? {read,write}_memory call error(). */
363 /* return pc value after skipping a function prologue and also return
364 information about a function frame.
366 in struct rs6000_framedata fdata:
367 - frameless is TRUE, if function does not have a frame.
368 - nosavedpc is TRUE, if function does not save %pc value in its frame.
369 - offset is the initial size of this stack frame --- the amount by
370 which we decrement the sp to allocate the frame.
371 - saved_gpr is the number of the first saved gpr.
372 - saved_fpr is the number of the first saved fpr.
373 - alloca_reg is the number of the register used for alloca() handling.
375 - gpr_offset is the offset of the first saved gpr from the previous frame.
376 - fpr_offset is the offset of the first saved fpr from the previous frame.
377 - lr_offset is the offset of the saved lr
378 - cr_offset is the offset of the saved cr
381 #define SIGNED_SHORT(x) \
382 ((sizeof (short) == 2) \
383 ? ((int)(short)(x)) \
384 : ((int)((((x) & 0xffff) ^ 0x8000) - 0x8000)))
386 #define GET_SRC_REG(x) (((x) >> 21) & 0x1f)
388 /* Limit the number of skipped non-prologue instructions, as the examining
389 of the prologue is expensive. */
390 static int max_skip_non_prologue_insns
= 10;
392 /* Given PC representing the starting address of a function, and
393 LIM_PC which is the (sloppy) limit to which to scan when looking
394 for a prologue, attempt to further refine this limit by using
395 the line data in the symbol table. If successful, a better guess
396 on where the prologue ends is returned, otherwise the previous
397 value of lim_pc is returned. */
399 refine_prologue_limit (CORE_ADDR pc
, CORE_ADDR lim_pc
)
401 struct symtab_and_line prologue_sal
;
403 prologue_sal
= find_pc_line (pc
, 0);
404 if (prologue_sal
.line
!= 0)
407 CORE_ADDR addr
= prologue_sal
.end
;
409 /* Handle the case in which compiler's optimizer/scheduler
410 has moved instructions into the prologue. We scan ahead
411 in the function looking for address ranges whose corresponding
412 line number is less than or equal to the first one that we
413 found for the function. (It can be less than when the
414 scheduler puts a body instruction before the first prologue
416 for (i
= 2 * max_skip_non_prologue_insns
;
417 i
> 0 && (lim_pc
== 0 || addr
< lim_pc
);
420 struct symtab_and_line sal
;
422 sal
= find_pc_line (addr
, 0);
425 if (sal
.line
<= prologue_sal
.line
426 && sal
.symtab
== prologue_sal
.symtab
)
433 if (lim_pc
== 0 || prologue_sal
.end
< lim_pc
)
434 lim_pc
= prologue_sal
.end
;
441 skip_prologue (CORE_ADDR pc
, CORE_ADDR lim_pc
, struct rs6000_framedata
*fdata
)
443 CORE_ADDR orig_pc
= pc
;
444 CORE_ADDR last_prologue_pc
= pc
;
452 int minimal_toc_loaded
= 0;
453 int prev_insn_was_prologue_insn
= 1;
454 int num_skip_non_prologue_insns
= 0;
456 /* Attempt to find the end of the prologue when no limit is specified.
457 Note that refine_prologue_limit() has been written so that it may
458 be used to "refine" the limits of non-zero PC values too, but this
459 is only safe if we 1) trust the line information provided by the
460 compiler and 2) iterate enough to actually find the end of the
463 It may become a good idea at some point (for both performance and
464 accuracy) to unconditionally call refine_prologue_limit(). But,
465 until we can make a clear determination that this is beneficial,
466 we'll play it safe and only use it to obtain a limit when none
467 has been specified. */
469 lim_pc
= refine_prologue_limit (pc
, lim_pc
);
471 memset (fdata
, 0, sizeof (struct rs6000_framedata
));
472 fdata
->saved_gpr
= -1;
473 fdata
->saved_fpr
= -1;
474 fdata
->alloca_reg
= -1;
475 fdata
->frameless
= 1;
476 fdata
->nosavedpc
= 1;
480 /* Sometimes it isn't clear if an instruction is a prologue
481 instruction or not. When we encounter one of these ambiguous
482 cases, we'll set prev_insn_was_prologue_insn to 0 (false).
483 Otherwise, we'll assume that it really is a prologue instruction. */
484 if (prev_insn_was_prologue_insn
)
485 last_prologue_pc
= pc
;
487 /* Stop scanning if we've hit the limit. */
488 if (lim_pc
!= 0 && pc
>= lim_pc
)
491 prev_insn_was_prologue_insn
= 1;
493 /* Fetch the instruction and convert it to an integer. */
494 if (target_read_memory (pc
, buf
, 4))
496 op
= extract_signed_integer (buf
, 4);
498 if ((op
& 0xfc1fffff) == 0x7c0802a6)
500 lr_reg
= (op
& 0x03e00000) | 0x90010000;
504 else if ((op
& 0xfc1fffff) == 0x7c000026)
506 cr_reg
= (op
& 0x03e00000) | 0x90010000;
510 else if ((op
& 0xfc1f0000) == 0xd8010000)
511 { /* stfd Rx,NUM(r1) */
512 reg
= GET_SRC_REG (op
);
513 if (fdata
->saved_fpr
== -1 || fdata
->saved_fpr
> reg
)
515 fdata
->saved_fpr
= reg
;
516 fdata
->fpr_offset
= SIGNED_SHORT (op
) + offset
;
521 else if (((op
& 0xfc1f0000) == 0xbc010000) || /* stm Rx, NUM(r1) */
522 (((op
& 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
523 (op
& 0xfc1f0003) == 0xf8010000) && /* std rx,NUM(r1) */
524 (op
& 0x03e00000) >= 0x01a00000)) /* rx >= r13 */
527 reg
= GET_SRC_REG (op
);
528 if (fdata
->saved_gpr
== -1 || fdata
->saved_gpr
> reg
)
530 fdata
->saved_gpr
= reg
;
531 if ((op
& 0xfc1f0003) == 0xf8010000)
533 fdata
->gpr_offset
= SIGNED_SHORT (op
) + offset
;
538 else if ((op
& 0xffff0000) == 0x60000000)
541 /* Allow nops in the prologue, but do not consider them to
542 be part of the prologue unless followed by other prologue
544 prev_insn_was_prologue_insn
= 0;
548 else if ((op
& 0xffff0000) == 0x3c000000)
549 { /* addis 0,0,NUM, used
551 fdata
->offset
= (op
& 0x0000ffff) << 16;
552 fdata
->frameless
= 0;
556 else if ((op
& 0xffff0000) == 0x60000000)
557 { /* ori 0,0,NUM, 2nd ha
558 lf of >= 32k frames */
559 fdata
->offset
|= (op
& 0x0000ffff);
560 fdata
->frameless
= 0;
564 else if (lr_reg
!= -1 && (op
& 0xffff0000) == lr_reg
)
567 fdata
->lr_offset
= SIGNED_SHORT (op
) + offset
;
568 fdata
->nosavedpc
= 0;
573 else if (cr_reg
!= -1 && (op
& 0xffff0000) == cr_reg
)
576 fdata
->cr_offset
= SIGNED_SHORT (op
) + offset
;
581 else if (op
== 0x48000005)
587 else if (op
== 0x48000004)
592 else if (((op
& 0xffff0000) == 0x801e0000 || /* lwz 0,NUM(r30), used
593 in V.4 -mrelocatable */
594 op
== 0x7fc0f214) && /* add r30,r0,r30, used
595 in V.4 -mrelocatable */
596 lr_reg
== 0x901e0000)
601 else if ((op
& 0xffff0000) == 0x3fc00000 || /* addis 30,0,foo@ha, used
602 in V.4 -mminimal-toc */
603 (op
& 0xffff0000) == 0x3bde0000)
604 { /* addi 30,30,foo@l */
608 else if ((op
& 0xfc000001) == 0x48000001)
612 fdata
->frameless
= 0;
613 /* Don't skip over the subroutine call if it is not within the first
614 three instructions of the prologue. */
615 if ((pc
- orig_pc
) > 8)
618 op
= read_memory_integer (pc
+ 4, 4);
620 /* At this point, make sure this is not a trampoline function
621 (a function that simply calls another functions, and nothing else).
622 If the next is not a nop, this branch was part of the function
625 if (op
== 0x4def7b82 || op
== 0) /* crorc 15, 15, 15 */
626 break; /* don't skip over
630 /* update stack pointer */
632 else if ((op
& 0xffff0000) == 0x94210000 || /* stu r1,NUM(r1) */
633 (op
& 0xffff0003) == 0xf8210001) /* stdu r1,NUM(r1) */
635 fdata
->frameless
= 0;
636 if ((op
& 0xffff0003) == 0xf8210001)
638 fdata
->offset
= SIGNED_SHORT (op
);
639 offset
= fdata
->offset
;
643 else if (op
== 0x7c21016e)
645 fdata
->frameless
= 0;
646 offset
= fdata
->offset
;
649 /* Load up minimal toc pointer */
651 else if ((op
>> 22) == 0x20f
652 && !minimal_toc_loaded
)
653 { /* l r31,... or l r30,... */
654 minimal_toc_loaded
= 1;
657 /* move parameters from argument registers to local variable
660 else if ((op
& 0xfc0007fe) == 0x7c000378 && /* mr(.) Rx,Ry */
661 (((op
>> 21) & 31) >= 3) && /* R3 >= Ry >= R10 */
662 (((op
>> 21) & 31) <= 10) &&
663 (((op
>> 16) & 31) >= fdata
->saved_gpr
)) /* Rx: local var reg */
667 /* store parameters in stack */
669 else if ((op
& 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
670 (op
& 0xfc1f0003) == 0xf8010000 || /* std rx,NUM(r1) */
671 (op
& 0xfc1f0000) == 0xd8010000 || /* stfd Rx,NUM(r1) */
672 (op
& 0xfc1f0000) == 0xfc010000) /* frsp, fp?,NUM(r1) */
676 /* store parameters in stack via frame pointer */
679 ((op
& 0xfc1f0000) == 0x901f0000 || /* st rx,NUM(r1) */
680 (op
& 0xfc1f0000) == 0xd81f0000 || /* stfd Rx,NUM(r1) */
681 (op
& 0xfc1f0000) == 0xfc1f0000))
682 { /* frsp, fp?,NUM(r1) */
685 /* Set up frame pointer */
687 else if (op
== 0x603f0000 /* oril r31, r1, 0x0 */
690 fdata
->frameless
= 0;
692 fdata
->alloca_reg
= 31;
695 /* Another way to set up the frame pointer. */
697 else if ((op
& 0xfc1fffff) == 0x38010000)
698 { /* addi rX, r1, 0x0 */
699 fdata
->frameless
= 0;
701 fdata
->alloca_reg
= (op
& ~0x38010000) >> 21;
707 /* Not a recognized prologue instruction.
708 Handle optimizer code motions into the prologue by continuing
709 the search if we have no valid frame yet or if the return
710 address is not yet saved in the frame. */
711 if (fdata
->frameless
== 0
712 && (lr_reg
== -1 || fdata
->nosavedpc
== 0))
715 if (op
== 0x4e800020 /* blr */
716 || op
== 0x4e800420) /* bctr */
717 /* Do not scan past epilogue in frameless functions or
720 if ((op
& 0xf4000000) == 0x40000000) /* bxx */
721 /* Never skip branches. */
724 if (num_skip_non_prologue_insns
++ > max_skip_non_prologue_insns
)
725 /* Do not scan too many insns, scanning insns is expensive with
729 /* Continue scanning. */
730 prev_insn_was_prologue_insn
= 0;
736 /* I have problems with skipping over __main() that I need to address
737 * sometime. Previously, I used to use misc_function_vector which
738 * didn't work as well as I wanted to be. -MGO */
740 /* If the first thing after skipping a prolog is a branch to a function,
741 this might be a call to an initializer in main(), introduced by gcc2.
742 We'd like to skip over it as well. Fortunately, xlc does some extra
743 work before calling a function right after a prologue, thus we can
744 single out such gcc2 behaviour. */
747 if ((op
& 0xfc000001) == 0x48000001)
748 { /* bl foo, an initializer function? */
749 op
= read_memory_integer (pc
+ 4, 4);
751 if (op
== 0x4def7b82)
752 { /* cror 0xf, 0xf, 0xf (nop) */
754 /* check and see if we are in main. If so, skip over this initializer
757 tmp
= find_pc_misc_function (pc
);
758 if (tmp
>= 0 && STREQ (misc_function_vector
[tmp
].name
, main_name ()))
764 fdata
->offset
= -fdata
->offset
;
765 return last_prologue_pc
;
769 /*************************************************************************
770 Support for creating pushing a dummy frame into the stack, and popping
772 *************************************************************************/
775 /* Pop the innermost frame, go back to the caller. */
778 rs6000_pop_frame (void)
780 CORE_ADDR pc
, lr
, sp
, prev_sp
, addr
; /* %pc, %lr, %sp */
781 struct rs6000_framedata fdata
;
782 struct frame_info
*frame
= get_current_frame ();
786 sp
= FRAME_FP (frame
);
788 if (PC_IN_CALL_DUMMY (frame
->pc
, frame
->frame
, frame
->frame
))
790 generic_pop_dummy_frame ();
791 flush_cached_frames ();
795 /* Make sure that all registers are valid. */
796 read_register_bytes (0, NULL
, REGISTER_BYTES
);
798 /* figure out previous %pc value. If the function is frameless, it is
799 still in the link register, otherwise walk the frames and retrieve the
800 saved %pc value in the previous frame. */
802 addr
= get_pc_function_start (frame
->pc
);
803 (void) skip_prologue (addr
, frame
->pc
, &fdata
);
805 wordsize
= TDEP
->wordsize
;
809 prev_sp
= read_memory_addr (sp
, wordsize
);
810 if (fdata
.lr_offset
== 0)
811 lr
= read_register (PPC_LR_REGNUM
);
813 lr
= read_memory_addr (prev_sp
+ fdata
.lr_offset
, wordsize
);
815 /* reset %pc value. */
816 write_register (PC_REGNUM
, lr
);
818 /* reset register values if any was saved earlier. */
820 if (fdata
.saved_gpr
!= -1)
822 addr
= prev_sp
+ fdata
.gpr_offset
;
823 for (ii
= fdata
.saved_gpr
; ii
<= 31; ++ii
)
825 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
)], wordsize
);
830 if (fdata
.saved_fpr
!= -1)
832 addr
= prev_sp
+ fdata
.fpr_offset
;
833 for (ii
= fdata
.saved_fpr
; ii
<= 31; ++ii
)
835 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
+ FP0_REGNUM
)], 8);
840 write_register (SP_REGNUM
, prev_sp
);
841 target_store_registers (-1);
842 flush_cached_frames ();
845 /* Fixup the call sequence of a dummy function, with the real function
846 address. Its arguments will be passed by gdb. */
849 rs6000_fix_call_dummy (char *dummyname
, CORE_ADDR pc
, CORE_ADDR fun
,
850 int nargs
, struct value
**args
, struct type
*type
,
853 #define TOC_ADDR_OFFSET 20
854 #define TARGET_ADDR_OFFSET 28
857 CORE_ADDR target_addr
;
859 if (rs6000_find_toc_address_hook
!= NULL
)
861 CORE_ADDR tocvalue
= (*rs6000_find_toc_address_hook
) (fun
);
862 write_register (PPC_TOC_REGNUM
, tocvalue
);
866 /* Pass the arguments in either registers, or in the stack. In RS/6000,
867 the first eight words of the argument list (that might be less than
868 eight parameters if some parameters occupy more than one word) are
869 passed in r3..r10 registers. float and double parameters are
870 passed in fpr's, in addition to that. Rest of the parameters if any
871 are passed in user stack. There might be cases in which half of the
872 parameter is copied into registers, the other half is pushed into
875 Stack must be aligned on 64-bit boundaries when synthesizing
878 If the function is returning a structure, then the return address is passed
879 in r3, then the first 7 words of the parameters can be passed in registers,
883 rs6000_push_arguments (int nargs
, struct value
**args
, CORE_ADDR sp
,
884 int struct_return
, CORE_ADDR struct_addr
)
888 int argno
; /* current argument number */
889 int argbytes
; /* current argument byte */
891 int f_argno
= 0; /* current floating point argno */
892 int wordsize
= TDEP
->wordsize
;
894 struct value
*arg
= 0;
899 /* The first eight words of ther arguments are passed in registers. Copy
902 If the function is returning a `struct', then the first word (which
903 will be passed in r3) is used for struct return address. In that
904 case we should advance one word and start from r4 register to copy
907 ii
= struct_return
? 1 : 0;
910 effectively indirect call... gcc does...
912 return_val example( float, int);
915 float in fp0, int in r3
916 offset of stack on overflow 8/16
917 for varargs, must go by type.
919 float in r3&r4, int in r5
920 offset of stack on overflow different
922 return in r3 or f0. If no float, must study how gcc emulates floats;
923 pay attention to arg promotion.
924 User may have to cast\args to handle promotion correctly
925 since gdb won't know if prototype supplied or not.
928 for (argno
= 0, argbytes
= 0; argno
< nargs
&& ii
< 8; ++ii
)
930 int reg_size
= REGISTER_RAW_SIZE (ii
+ 3);
933 type
= check_typedef (VALUE_TYPE (arg
));
934 len
= TYPE_LENGTH (type
);
936 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
939 /* floating point arguments are passed in fpr's, as well as gpr's.
940 There are 13 fpr's reserved for passing parameters. At this point
941 there is no way we would run out of them. */
945 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
947 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
+ 1 + f_argno
)],
948 VALUE_CONTENTS (arg
),
956 /* Argument takes more than one register. */
957 while (argbytes
< len
)
959 memset (®isters
[REGISTER_BYTE (ii
+ 3)], 0, reg_size
);
960 memcpy (®isters
[REGISTER_BYTE (ii
+ 3)],
961 ((char *) VALUE_CONTENTS (arg
)) + argbytes
,
962 (len
- argbytes
) > reg_size
963 ? reg_size
: len
- argbytes
);
964 ++ii
, argbytes
+= reg_size
;
967 goto ran_out_of_registers_for_arguments
;
973 { /* Argument can fit in one register. No problem. */
974 int adj
= TARGET_BYTE_ORDER
== BIG_ENDIAN
? reg_size
- len
: 0;
975 memset (®isters
[REGISTER_BYTE (ii
+ 3)], 0, reg_size
);
976 memcpy ((char *)®isters
[REGISTER_BYTE (ii
+ 3)] + adj
,
977 VALUE_CONTENTS (arg
), len
);
982 ran_out_of_registers_for_arguments
:
984 saved_sp
= read_sp ();
985 #ifndef ELF_OBJECT_FORMAT
986 /* location for 8 parameters are always reserved. */
989 /* another six words for back chain, TOC register, link register, etc. */
992 /* stack pointer must be quadword aligned */
996 /* if there are more arguments, allocate space for them in
997 the stack, then push them starting from the ninth one. */
999 if ((argno
< nargs
) || argbytes
)
1005 space
+= ((len
- argbytes
+ 3) & -4);
1011 for (; jj
< nargs
; ++jj
)
1013 struct value
*val
= args
[jj
];
1014 space
+= ((TYPE_LENGTH (VALUE_TYPE (val
))) + 3) & -4;
1017 /* add location required for the rest of the parameters */
1018 space
= (space
+ 15) & -16;
1021 /* This is another instance we need to be concerned about securing our
1022 stack space. If we write anything underneath %sp (r1), we might conflict
1023 with the kernel who thinks he is free to use this area. So, update %sp
1024 first before doing anything else. */
1026 write_register (SP_REGNUM
, sp
);
1028 /* if the last argument copied into the registers didn't fit there
1029 completely, push the rest of it into stack. */
1033 write_memory (sp
+ 24 + (ii
* 4),
1034 ((char *) VALUE_CONTENTS (arg
)) + argbytes
,
1037 ii
+= ((len
- argbytes
+ 3) & -4) / 4;
1040 /* push the rest of the arguments into stack. */
1041 for (; argno
< nargs
; ++argno
)
1045 type
= check_typedef (VALUE_TYPE (arg
));
1046 len
= TYPE_LENGTH (type
);
1049 /* float types should be passed in fpr's, as well as in the stack. */
1050 if (TYPE_CODE (type
) == TYPE_CODE_FLT
&& f_argno
< 13)
1055 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
1057 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
+ 1 + f_argno
)],
1058 VALUE_CONTENTS (arg
),
1063 write_memory (sp
+ 24 + (ii
* 4), (char *) VALUE_CONTENTS (arg
), len
);
1064 ii
+= ((len
+ 3) & -4) / 4;
1068 /* Secure stack areas first, before doing anything else. */
1069 write_register (SP_REGNUM
, sp
);
1071 /* set back chain properly */
1072 store_address (tmp_buffer
, 4, saved_sp
);
1073 write_memory (sp
, tmp_buffer
, 4);
1075 target_store_registers (-1);
1079 /* Function: ppc_push_return_address (pc, sp)
1080 Set up the return address for the inferior function call. */
1083 ppc_push_return_address (CORE_ADDR pc
, CORE_ADDR sp
)
1085 write_register (PPC_LR_REGNUM
, CALL_DUMMY_ADDRESS ());
1089 /* Extract a function return value of type TYPE from raw register array
1090 REGBUF, and copy that return value into VALBUF in virtual format. */
1093 rs6000_extract_return_value (struct type
*valtype
, char *regbuf
, char *valbuf
)
1097 if (TYPE_CODE (valtype
) == TYPE_CODE_FLT
)
1102 /* floats and doubles are returned in fpr1. fpr's have a size of 8 bytes.
1103 We need to truncate the return value into float size (4 byte) if
1106 if (TYPE_LENGTH (valtype
) > 4) /* this is a double */
1108 ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)],
1109 TYPE_LENGTH (valtype
));
1112 memcpy (&dd
, ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)], 8);
1114 memcpy (valbuf
, &ff
, sizeof (float));
1119 /* return value is copied starting from r3. */
1120 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
1121 && TYPE_LENGTH (valtype
) < REGISTER_RAW_SIZE (3))
1122 offset
= REGISTER_RAW_SIZE (3) - TYPE_LENGTH (valtype
);
1125 regbuf
+ REGISTER_BYTE (3) + offset
,
1126 TYPE_LENGTH (valtype
));
1130 /* Keep structure return address in this variable.
1131 FIXME: This is a horrid kludge which should not be allowed to continue
1132 living. This only allows a single nested call to a structure-returning
1133 function. Come on, guys! -- gnu@cygnus.com, Aug 92 */
1135 static CORE_ADDR rs6000_struct_return_address
;
1137 /* Return whether handle_inferior_event() should proceed through code
1138 starting at PC in function NAME when stepping.
1140 The AIX -bbigtoc linker option generates functions @FIX0, @FIX1, etc. to
1141 handle memory references that are too distant to fit in instructions
1142 generated by the compiler. For example, if 'foo' in the following
1147 is greater than 32767, the linker might replace the lwz with a branch to
1148 somewhere in @FIX1 that does the load in 2 instructions and then branches
1149 back to where execution should continue.
1151 GDB should silently step over @FIX code, just like AIX dbx does.
1152 Unfortunately, the linker uses the "b" instruction for the branches,
1153 meaning that the link register doesn't get set. Therefore, GDB's usual
1154 step_over_function() mechanism won't work.
1156 Instead, use the IN_SOLIB_RETURN_TRAMPOLINE and SKIP_TRAMPOLINE_CODE hooks
1157 in handle_inferior_event() to skip past @FIX code. */
1160 rs6000_in_solib_return_trampoline (CORE_ADDR pc
, char *name
)
1162 return name
&& !strncmp (name
, "@FIX", 4);
1165 /* Skip code that the user doesn't want to see when stepping:
1167 1. Indirect function calls use a piece of trampoline code to do context
1168 switching, i.e. to set the new TOC table. Skip such code if we are on
1169 its first instruction (as when we have single-stepped to here).
1171 2. Skip shared library trampoline code (which is different from
1172 indirect function call trampolines).
1174 3. Skip bigtoc fixup code.
1176 Result is desired PC to step until, or NULL if we are not in
1177 code that should be skipped. */
1180 rs6000_skip_trampoline_code (CORE_ADDR pc
)
1182 register unsigned int ii
, op
;
1184 CORE_ADDR solib_target_pc
;
1185 struct minimal_symbol
*msymbol
;
1187 static unsigned trampoline_code
[] =
1189 0x800b0000, /* l r0,0x0(r11) */
1190 0x90410014, /* st r2,0x14(r1) */
1191 0x7c0903a6, /* mtctr r0 */
1192 0x804b0004, /* l r2,0x4(r11) */
1193 0x816b0008, /* l r11,0x8(r11) */
1194 0x4e800420, /* bctr */
1195 0x4e800020, /* br */
1199 /* Check for bigtoc fixup code. */
1200 msymbol
= lookup_minimal_symbol_by_pc (pc
);
1201 if (msymbol
&& rs6000_in_solib_return_trampoline (pc
, SYMBOL_NAME (msymbol
)))
1203 /* Double-check that the third instruction from PC is relative "b". */
1204 op
= read_memory_integer (pc
+ 8, 4);
1205 if ((op
& 0xfc000003) == 0x48000000)
1207 /* Extract bits 6-29 as a signed 24-bit relative word address and
1208 add it to the containing PC. */
1209 rel
= ((int)(op
<< 6) >> 6);
1210 return pc
+ 8 + rel
;
1214 /* If pc is in a shared library trampoline, return its target. */
1215 solib_target_pc
= find_solib_trampoline_target (pc
);
1216 if (solib_target_pc
)
1217 return solib_target_pc
;
1219 for (ii
= 0; trampoline_code
[ii
]; ++ii
)
1221 op
= read_memory_integer (pc
+ (ii
* 4), 4);
1222 if (op
!= trampoline_code
[ii
])
1225 ii
= read_register (11); /* r11 holds destination addr */
1226 pc
= read_memory_addr (ii
, TDEP
->wordsize
); /* (r11) value */
1230 /* Determines whether the function FI has a frame on the stack or not. */
1233 rs6000_frameless_function_invocation (struct frame_info
*fi
)
1235 CORE_ADDR func_start
;
1236 struct rs6000_framedata fdata
;
1238 /* Don't even think about framelessness except on the innermost frame
1239 or if the function was interrupted by a signal. */
1240 if (fi
->next
!= NULL
&& !fi
->next
->signal_handler_caller
)
1243 func_start
= get_pc_function_start (fi
->pc
);
1245 /* If we failed to find the start of the function, it is a mistake
1246 to inspect the instructions. */
1250 /* A frame with a zero PC is usually created by dereferencing a NULL
1251 function pointer, normally causing an immediate core dump of the
1252 inferior. Mark function as frameless, as the inferior has no chance
1253 of setting up a stack frame. */
1260 (void) skip_prologue (func_start
, fi
->pc
, &fdata
);
1261 return fdata
.frameless
;
1264 /* Return the PC saved in a frame */
1267 rs6000_frame_saved_pc (struct frame_info
*fi
)
1269 CORE_ADDR func_start
;
1270 struct rs6000_framedata fdata
;
1271 int wordsize
= TDEP
->wordsize
;
1273 if (fi
->signal_handler_caller
)
1274 return read_memory_addr (fi
->frame
+ SIG_FRAME_PC_OFFSET
, wordsize
);
1276 if (PC_IN_CALL_DUMMY (fi
->pc
, fi
->frame
, fi
->frame
))
1277 return generic_read_register_dummy (fi
->pc
, fi
->frame
, PC_REGNUM
);
1279 func_start
= get_pc_function_start (fi
->pc
);
1281 /* If we failed to find the start of the function, it is a mistake
1282 to inspect the instructions. */
1286 (void) skip_prologue (func_start
, fi
->pc
, &fdata
);
1288 if (fdata
.lr_offset
== 0 && fi
->next
!= NULL
)
1290 if (fi
->next
->signal_handler_caller
)
1291 return read_memory_addr (fi
->next
->frame
+ SIG_FRAME_LR_OFFSET
,
1294 return read_memory_addr (FRAME_CHAIN (fi
) + DEFAULT_LR_SAVE
,
1298 if (fdata
.lr_offset
== 0)
1299 return read_register (PPC_LR_REGNUM
);
1301 return read_memory_addr (FRAME_CHAIN (fi
) + fdata
.lr_offset
, wordsize
);
1304 /* If saved registers of frame FI are not known yet, read and cache them.
1305 &FDATAP contains rs6000_framedata; TDATAP can be NULL,
1306 in which case the framedata are read. */
1309 frame_get_saved_regs (struct frame_info
*fi
, struct rs6000_framedata
*fdatap
)
1311 CORE_ADDR frame_addr
;
1312 struct rs6000_framedata work_fdata
;
1313 int wordsize
= TDEP
->wordsize
;
1320 fdatap
= &work_fdata
;
1321 (void) skip_prologue (get_pc_function_start (fi
->pc
), fi
->pc
, fdatap
);
1324 frame_saved_regs_zalloc (fi
);
1326 /* If there were any saved registers, figure out parent's stack
1328 /* The following is true only if the frame doesn't have a call to
1331 if (fdatap
->saved_fpr
== 0 && fdatap
->saved_gpr
== 0
1332 && fdatap
->lr_offset
== 0 && fdatap
->cr_offset
== 0)
1334 else if (fi
->prev
&& fi
->prev
->frame
)
1335 frame_addr
= fi
->prev
->frame
;
1337 frame_addr
= read_memory_addr (fi
->frame
, wordsize
);
1339 /* if != -1, fdatap->saved_fpr is the smallest number of saved_fpr.
1340 All fpr's from saved_fpr to fp31 are saved. */
1342 if (fdatap
->saved_fpr
>= 0)
1345 CORE_ADDR fpr_addr
= frame_addr
+ fdatap
->fpr_offset
;
1346 for (i
= fdatap
->saved_fpr
; i
< 32; i
++)
1348 fi
->saved_regs
[FP0_REGNUM
+ i
] = fpr_addr
;
1353 /* if != -1, fdatap->saved_gpr is the smallest number of saved_gpr.
1354 All gpr's from saved_gpr to gpr31 are saved. */
1356 if (fdatap
->saved_gpr
>= 0)
1359 CORE_ADDR gpr_addr
= frame_addr
+ fdatap
->gpr_offset
;
1360 for (i
= fdatap
->saved_gpr
; i
< 32; i
++)
1362 fi
->saved_regs
[i
] = gpr_addr
;
1363 gpr_addr
+= wordsize
;
1367 /* If != 0, fdatap->cr_offset is the offset from the frame that holds
1369 if (fdatap
->cr_offset
!= 0)
1370 fi
->saved_regs
[PPC_CR_REGNUM
] = frame_addr
+ fdatap
->cr_offset
;
1372 /* If != 0, fdatap->lr_offset is the offset from the frame that holds
1374 if (fdatap
->lr_offset
!= 0)
1375 fi
->saved_regs
[PPC_LR_REGNUM
] = frame_addr
+ fdatap
->lr_offset
;
1378 /* Return the address of a frame. This is the inital %sp value when the frame
1379 was first allocated. For functions calling alloca(), it might be saved in
1380 an alloca register. */
1383 frame_initial_stack_address (struct frame_info
*fi
)
1386 struct rs6000_framedata fdata
;
1387 struct frame_info
*callee_fi
;
1389 /* if the initial stack pointer (frame address) of this frame is known,
1392 if (fi
->extra_info
->initial_sp
)
1393 return fi
->extra_info
->initial_sp
;
1395 /* find out if this function is using an alloca register.. */
1397 (void) skip_prologue (get_pc_function_start (fi
->pc
), fi
->pc
, &fdata
);
1399 /* if saved registers of this frame are not known yet, read and cache them. */
1401 if (!fi
->saved_regs
)
1402 frame_get_saved_regs (fi
, &fdata
);
1404 /* If no alloca register used, then fi->frame is the value of the %sp for
1405 this frame, and it is good enough. */
1407 if (fdata
.alloca_reg
< 0)
1409 fi
->extra_info
->initial_sp
= fi
->frame
;
1410 return fi
->extra_info
->initial_sp
;
1413 /* This function has an alloca register. If this is the top-most frame
1414 (with the lowest address), the value in alloca register is good. */
1417 return fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1419 /* Otherwise, this is a caller frame. Callee has usually already saved
1420 registers, but there are exceptions (such as when the callee
1421 has no parameters). Find the address in which caller's alloca
1422 register is saved. */
1424 for (callee_fi
= fi
->next
; callee_fi
; callee_fi
= callee_fi
->next
)
1427 if (!callee_fi
->saved_regs
)
1428 frame_get_saved_regs (callee_fi
, NULL
);
1430 /* this is the address in which alloca register is saved. */
1432 tmpaddr
= callee_fi
->saved_regs
[fdata
.alloca_reg
];
1435 fi
->extra_info
->initial_sp
=
1436 read_memory_addr (tmpaddr
, TDEP
->wordsize
);
1437 return fi
->extra_info
->initial_sp
;
1440 /* Go look into deeper levels of the frame chain to see if any one of
1441 the callees has saved alloca register. */
1444 /* If alloca register was not saved, by the callee (or any of its callees)
1445 then the value in the register is still good. */
1447 fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1448 return fi
->extra_info
->initial_sp
;
1451 /* Describe the pointer in each stack frame to the previous stack frame
1454 /* FRAME_CHAIN takes a frame's nominal address
1455 and produces the frame's chain-pointer. */
1457 /* In the case of the RS/6000, the frame's nominal address
1458 is the address of a 4-byte word containing the calling frame's address. */
1461 rs6000_frame_chain (struct frame_info
*thisframe
)
1463 CORE_ADDR fp
, fpp
, lr
;
1464 int wordsize
= TDEP
->wordsize
;
1466 if (PC_IN_CALL_DUMMY (thisframe
->pc
, thisframe
->frame
, thisframe
->frame
))
1467 return thisframe
->frame
; /* dummy frame same as caller's frame */
1469 if (inside_entry_file (thisframe
->pc
) ||
1470 thisframe
->pc
== entry_point_address ())
1473 if (thisframe
->signal_handler_caller
)
1474 fp
= read_memory_addr (thisframe
->frame
+ SIG_FRAME_FP_OFFSET
,
1476 else if (thisframe
->next
!= NULL
1477 && thisframe
->next
->signal_handler_caller
1478 && FRAMELESS_FUNCTION_INVOCATION (thisframe
))
1479 /* A frameless function interrupted by a signal did not change the
1481 fp
= FRAME_FP (thisframe
);
1483 fp
= read_memory_addr ((thisframe
)->frame
, wordsize
);
1485 lr
= read_register (PPC_LR_REGNUM
);
1486 if (lr
== entry_point_address ())
1487 if (fp
!= 0 && (fpp
= read_memory_addr (fp
, wordsize
)) != 0)
1488 if (PC_IN_CALL_DUMMY (lr
, fpp
, fpp
))
1494 /* Return the size of register REG when words are WORDSIZE bytes long. If REG
1495 isn't available with that word size, return 0. */
1498 regsize (const struct reg
*reg
, int wordsize
)
1500 return wordsize
== 8 ? reg
->sz64
: reg
->sz32
;
1503 /* Return the name of register number N, or null if no such register exists
1504 in the current architecture. */
1507 rs6000_register_name (int n
)
1509 struct gdbarch_tdep
*tdep
= TDEP
;
1510 const struct reg
*reg
= tdep
->regs
+ n
;
1512 if (!regsize (reg
, tdep
->wordsize
))
1517 /* Index within `registers' of the first byte of the space for
1521 rs6000_register_byte (int n
)
1523 return TDEP
->regoff
[n
];
1526 /* Return the number of bytes of storage in the actual machine representation
1527 for register N if that register is available, else return 0. */
1530 rs6000_register_raw_size (int n
)
1532 struct gdbarch_tdep
*tdep
= TDEP
;
1533 const struct reg
*reg
= tdep
->regs
+ n
;
1534 return regsize (reg
, tdep
->wordsize
);
1537 /* Number of bytes of storage in the program's representation
1541 rs6000_register_virtual_size (int n
)
1543 return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (n
));
1546 /* Return the GDB type object for the "standard" data type
1547 of data in register N. */
1549 static struct type
*
1550 rs6000_register_virtual_type (int n
)
1552 struct gdbarch_tdep
*tdep
= TDEP
;
1553 const struct reg
*reg
= tdep
->regs
+ n
;
1555 return reg
->fpr
? builtin_type_double
:
1556 regsize (reg
, tdep
->wordsize
) == 8 ? builtin_type_int64
:
1560 /* For the PowerPC, it appears that the debug info marks float parameters as
1561 floats regardless of whether the function is prototyped, but the actual
1562 values are always passed in as doubles. Tell gdb to always assume that
1563 floats are passed as doubles and then converted in the callee. */
1566 rs6000_coerce_float_to_double (struct type
*formal
, struct type
*actual
)
1571 /* Return whether register N requires conversion when moving from raw format
1574 The register format for RS/6000 floating point registers is always
1575 double, we need a conversion if the memory format is float. */
1578 rs6000_register_convertible (int n
)
1580 const struct reg
*reg
= TDEP
->regs
+ n
;
1584 /* Convert data from raw format for register N in buffer FROM
1585 to virtual format with type TYPE in buffer TO. */
1588 rs6000_register_convert_to_virtual (int n
, struct type
*type
,
1589 char *from
, char *to
)
1591 if (TYPE_LENGTH (type
) != REGISTER_RAW_SIZE (n
))
1593 double val
= extract_floating (from
, REGISTER_RAW_SIZE (n
));
1594 store_floating (to
, TYPE_LENGTH (type
), val
);
1597 memcpy (to
, from
, REGISTER_RAW_SIZE (n
));
1600 /* Convert data from virtual format with type TYPE in buffer FROM
1601 to raw format for register N in buffer TO. */
1604 rs6000_register_convert_to_raw (struct type
*type
, int n
,
1605 char *from
, char *to
)
1607 if (TYPE_LENGTH (type
) != REGISTER_RAW_SIZE (n
))
1609 double val
= extract_floating (from
, TYPE_LENGTH (type
));
1610 store_floating (to
, REGISTER_RAW_SIZE (n
), val
);
1613 memcpy (to
, from
, REGISTER_RAW_SIZE (n
));
1616 /* Store the address of the place in which to copy the structure the
1617 subroutine will return. This is called from call_function.
1619 In RS/6000, struct return addresses are passed as an extra parameter in r3.
1620 In function return, callee is not responsible of returning this address
1621 back. Since gdb needs to find it, we will store in a designated variable
1622 `rs6000_struct_return_address'. */
1625 rs6000_store_struct_return (CORE_ADDR addr
, CORE_ADDR sp
)
1627 write_register (3, addr
);
1628 rs6000_struct_return_address
= addr
;
1631 /* Write into appropriate registers a function return value
1632 of type TYPE, given in virtual format. */
1635 rs6000_store_return_value (struct type
*type
, char *valbuf
)
1637 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
1639 /* Floating point values are returned starting from FPR1 and up.
1640 Say a double_double_double type could be returned in
1641 FPR1/FPR2/FPR3 triple. */
1643 write_register_bytes (REGISTER_BYTE (FP0_REGNUM
+ 1), valbuf
,
1644 TYPE_LENGTH (type
));
1646 /* Everything else is returned in GPR3 and up. */
1647 write_register_bytes (REGISTER_BYTE (PPC_GP0_REGNUM
+ 3), valbuf
,
1648 TYPE_LENGTH (type
));
1651 /* Extract from an array REGBUF containing the (raw) register state
1652 the address in which a function should return its structure value,
1653 as a CORE_ADDR (or an expression that can be used as one). */
1656 rs6000_extract_struct_value_address (char *regbuf
)
1658 return rs6000_struct_return_address
;
1661 /* Return whether PC is in a dummy function call.
1663 FIXME: This just checks for the end of the stack, which is broken
1664 for things like stepping through gcc nested function stubs. */
1667 rs6000_pc_in_call_dummy (CORE_ADDR pc
, CORE_ADDR sp
, CORE_ADDR fp
)
1669 return sp
< pc
&& pc
< fp
;
1672 /* Hook called when a new child process is started. */
1675 rs6000_create_inferior (int pid
)
1677 if (rs6000_set_host_arch_hook
)
1678 rs6000_set_host_arch_hook (pid
);
1681 /* Support for CONVERT_FROM_FUNC_PTR_ADDR(ADDR).
1683 Usually a function pointer's representation is simply the address
1684 of the function. On the RS/6000 however, a function pointer is
1685 represented by a pointer to a TOC entry. This TOC entry contains
1686 three words, the first word is the address of the function, the
1687 second word is the TOC pointer (r2), and the third word is the
1688 static chain value. Throughout GDB it is currently assumed that a
1689 function pointer contains the address of the function, which is not
1690 easy to fix. In addition, the conversion of a function address to
1691 a function pointer would require allocation of a TOC entry in the
1692 inferior's memory space, with all its drawbacks. To be able to
1693 call C++ virtual methods in the inferior (which are called via
1694 function pointers), find_function_addr uses this function to get the
1695 function address from a function pointer. */
1697 /* Return real function address if ADDR (a function pointer) is in the data
1698 space and is therefore a special function pointer. */
1701 rs6000_convert_from_func_ptr_addr (CORE_ADDR addr
)
1703 struct obj_section
*s
;
1705 s
= find_pc_section (addr
);
1706 if (s
&& s
->the_bfd_section
->flags
& SEC_CODE
)
1709 /* ADDR is in the data space, so it's a special function pointer. */
1710 return read_memory_addr (addr
, TDEP
->wordsize
);
1714 /* Handling the various POWER/PowerPC variants. */
1717 /* The arrays here called registers_MUMBLE hold information about available
1720 For each family of PPC variants, I've tried to isolate out the
1721 common registers and put them up front, so that as long as you get
1722 the general family right, GDB will correctly identify the registers
1723 common to that family. The common register sets are:
1725 For the 60x family: hid0 hid1 iabr dabr pir
1727 For the 505 and 860 family: eie eid nri
1729 For the 403 and 403GC: icdbdr esr dear evpr cdbcr tsr tcr pit tbhi
1730 tblo srr2 srr3 dbsr dbcr iac1 iac2 dac1 dac2 dccr iccr pbl1
1733 Most of these register groups aren't anything formal. I arrived at
1734 them by looking at the registers that occurred in more than one
1737 /* Convenience macros for populating register arrays. */
1739 /* Within another macro, convert S to a string. */
1743 /* Return a struct reg defining register NAME that's 32 bits on 32-bit systems
1744 and 64 bits on 64-bit systems. */
1745 #define R(name) { STR(name), 4, 8, 0 }
1747 /* Return a struct reg defining register NAME that's 32 bits on all
1749 #define R4(name) { STR(name), 4, 4, 0 }
1751 /* Return a struct reg defining register NAME that's 64 bits on all
1753 #define R8(name) { STR(name), 8, 8, 0 }
1755 /* Return a struct reg defining floating-point register NAME. */
1756 #define F(name) { STR(name), 8, 8, 1 }
1758 /* Return a struct reg defining register NAME that's 32 bits on 32-bit
1759 systems and that doesn't exist on 64-bit systems. */
1760 #define R32(name) { STR(name), 4, 0, 0 }
1762 /* Return a struct reg defining register NAME that's 64 bits on 64-bit
1763 systems and that doesn't exist on 32-bit systems. */
1764 #define R64(name) { STR(name), 0, 8, 0 }
1766 /* Return a struct reg placeholder for a register that doesn't exist. */
1767 #define R0 { 0, 0, 0, 0 }
1769 /* UISA registers common across all architectures, including POWER. */
1771 #define COMMON_UISA_REGS \
1772 /* 0 */ R(r0), R(r1), R(r2), R(r3), R(r4), R(r5), R(r6), R(r7), \
1773 /* 8 */ R(r8), R(r9), R(r10),R(r11),R(r12),R(r13),R(r14),R(r15), \
1774 /* 16 */ R(r16),R(r17),R(r18),R(r19),R(r20),R(r21),R(r22),R(r23), \
1775 /* 24 */ R(r24),R(r25),R(r26),R(r27),R(r28),R(r29),R(r30),R(r31), \
1776 /* 32 */ F(f0), F(f1), F(f2), F(f3), F(f4), F(f5), F(f6), F(f7), \
1777 /* 40 */ F(f8), F(f9), F(f10),F(f11),F(f12),F(f13),F(f14),F(f15), \
1778 /* 48 */ F(f16),F(f17),F(f18),F(f19),F(f20),F(f21),F(f22),F(f23), \
1779 /* 56 */ F(f24),F(f25),F(f26),F(f27),F(f28),F(f29),F(f30),F(f31), \
1780 /* 64 */ R(pc), R(ps)
1782 /* UISA-level SPRs for PowerPC. */
1783 #define PPC_UISA_SPRS \
1784 /* 66 */ R4(cr), R(lr), R(ctr), R4(xer), R0
1786 /* Segment registers, for PowerPC. */
1787 #define PPC_SEGMENT_REGS \
1788 /* 71 */ R32(sr0), R32(sr1), R32(sr2), R32(sr3), \
1789 /* 75 */ R32(sr4), R32(sr5), R32(sr6), R32(sr7), \
1790 /* 79 */ R32(sr8), R32(sr9), R32(sr10), R32(sr11), \
1791 /* 83 */ R32(sr12), R32(sr13), R32(sr14), R32(sr15)
1793 /* OEA SPRs for PowerPC. */
1794 #define PPC_OEA_SPRS \
1796 /* 88 */ R(ibat0u), R(ibat0l), R(ibat1u), R(ibat1l), \
1797 /* 92 */ R(ibat2u), R(ibat2l), R(ibat3u), R(ibat3l), \
1798 /* 96 */ R(dbat0u), R(dbat0l), R(dbat1u), R(dbat1l), \
1799 /* 100 */ R(dbat2u), R(dbat2l), R(dbat3u), R(dbat3l), \
1800 /* 104 */ R(sdr1), R64(asr), R(dar), R4(dsisr), \
1801 /* 108 */ R(sprg0), R(sprg1), R(sprg2), R(sprg3), \
1802 /* 112 */ R(srr0), R(srr1), R(tbl), R(tbu), \
1803 /* 116 */ R4(dec), R(dabr), R4(ear)
1805 /* IBM POWER (pre-PowerPC) architecture, user-level view. We only cover
1806 user-level SPR's. */
1807 static const struct reg registers_power
[] =
1810 /* 66 */ R4(cnd
), R(lr
), R(cnt
), R4(xer
), R4(mq
)
1813 /* PowerPC UISA - a PPC processor as viewed by user-level code. A UISA-only
1814 view of the PowerPC. */
1815 static const struct reg registers_powerpc
[] =
1821 /* IBM PowerPC 403. */
1822 static const struct reg registers_403
[] =
1828 /* 119 */ R(icdbdr
), R(esr
), R(dear
), R(evpr
),
1829 /* 123 */ R(cdbcr
), R(tsr
), R(tcr
), R(pit
),
1830 /* 127 */ R(tbhi
), R(tblo
), R(srr2
), R(srr3
),
1831 /* 131 */ R(dbsr
), R(dbcr
), R(iac1
), R(iac2
),
1832 /* 135 */ R(dac1
), R(dac2
), R(dccr
), R(iccr
),
1833 /* 139 */ R(pbl1
), R(pbu1
), R(pbl2
), R(pbu2
)
1836 /* IBM PowerPC 403GC. */
1837 static const struct reg registers_403GC
[] =
1843 /* 119 */ R(icdbdr
), R(esr
), R(dear
), R(evpr
),
1844 /* 123 */ R(cdbcr
), R(tsr
), R(tcr
), R(pit
),
1845 /* 127 */ R(tbhi
), R(tblo
), R(srr2
), R(srr3
),
1846 /* 131 */ R(dbsr
), R(dbcr
), R(iac1
), R(iac2
),
1847 /* 135 */ R(dac1
), R(dac2
), R(dccr
), R(iccr
),
1848 /* 139 */ R(pbl1
), R(pbu1
), R(pbl2
), R(pbu2
),
1849 /* 143 */ R(zpr
), R(pid
), R(sgr
), R(dcwr
),
1850 /* 147 */ R(tbhu
), R(tblu
)
1853 /* Motorola PowerPC 505. */
1854 static const struct reg registers_505
[] =
1860 /* 119 */ R(eie
), R(eid
), R(nri
)
1863 /* Motorola PowerPC 860 or 850. */
1864 static const struct reg registers_860
[] =
1870 /* 119 */ R(eie
), R(eid
), R(nri
), R(cmpa
),
1871 /* 123 */ R(cmpb
), R(cmpc
), R(cmpd
), R(icr
),
1872 /* 127 */ R(der
), R(counta
), R(countb
), R(cmpe
),
1873 /* 131 */ R(cmpf
), R(cmpg
), R(cmph
), R(lctrl1
),
1874 /* 135 */ R(lctrl2
), R(ictrl
), R(bar
), R(ic_cst
),
1875 /* 139 */ R(ic_adr
), R(ic_dat
), R(dc_cst
), R(dc_adr
),
1876 /* 143 */ R(dc_dat
), R(dpdr
), R(dpir
), R(immr
),
1877 /* 147 */ R(mi_ctr
), R(mi_ap
), R(mi_epn
), R(mi_twc
),
1878 /* 151 */ R(mi_rpn
), R(md_ctr
), R(m_casid
), R(md_ap
),
1879 /* 155 */ R(md_epn
), R(md_twb
), R(md_twc
), R(md_rpn
),
1880 /* 159 */ R(m_tw
), R(mi_dbcam
), R(mi_dbram0
), R(mi_dbram1
),
1881 /* 163 */ R(md_dbcam
), R(md_dbram0
), R(md_dbram1
)
1884 /* Motorola PowerPC 601. Note that the 601 has different register numbers
1885 for reading and writing RTCU and RTCL. However, how one reads and writes a
1886 register is the stub's problem. */
1887 static const struct reg registers_601
[] =
1893 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1894 /* 123 */ R(pir
), R(mq
), R(rtcu
), R(rtcl
)
1897 /* Motorola PowerPC 602. */
1898 static const struct reg registers_602
[] =
1904 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R0
,
1905 /* 123 */ R0
, R(tcr
), R(ibr
), R(esassr
),
1906 /* 127 */ R(sebr
), R(ser
), R(sp
), R(lt
)
1909 /* Motorola/IBM PowerPC 603 or 603e. */
1910 static const struct reg registers_603
[] =
1916 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R0
,
1917 /* 123 */ R0
, R(dmiss
), R(dcmp
), R(hash1
),
1918 /* 127 */ R(hash2
), R(imiss
), R(icmp
), R(rpa
)
1921 /* Motorola PowerPC 604 or 604e. */
1922 static const struct reg registers_604
[] =
1928 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1929 /* 123 */ R(pir
), R(mmcr0
), R(pmc1
), R(pmc2
),
1930 /* 127 */ R(sia
), R(sda
)
1933 /* Motorola/IBM PowerPC 750 or 740. */
1934 static const struct reg registers_750
[] =
1940 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1941 /* 123 */ R0
, R(ummcr0
), R(upmc1
), R(upmc2
),
1942 /* 127 */ R(usia
), R(ummcr1
), R(upmc3
), R(upmc4
),
1943 /* 131 */ R(mmcr0
), R(pmc1
), R(pmc2
), R(sia
),
1944 /* 135 */ R(mmcr1
), R(pmc3
), R(pmc4
), R(l2cr
),
1945 /* 139 */ R(ictc
), R(thrm1
), R(thrm2
), R(thrm3
)
1949 /* Information about a particular processor variant. */
1953 /* Name of this variant. */
1956 /* English description of the variant. */
1959 /* bfd_arch_info.arch corresponding to variant. */
1960 enum bfd_architecture arch
;
1962 /* bfd_arch_info.mach corresponding to variant. */
1965 /* Table of register names; registers[R] is the name of the register
1968 const struct reg
*regs
;
1971 #define num_registers(list) (sizeof (list) / sizeof((list)[0]))
1974 /* Information in this table comes from the following web sites:
1975 IBM: http://www.chips.ibm.com:80/products/embedded/
1976 Motorola: http://www.mot.com/SPS/PowerPC/
1978 I'm sure I've got some of the variant descriptions not quite right.
1979 Please report any inaccuracies you find to GDB's maintainer.
1981 If you add entries to this table, please be sure to allow the new
1982 value as an argument to the --with-cpu flag, in configure.in. */
1984 static const struct variant variants
[] =
1986 {"powerpc", "PowerPC user-level", bfd_arch_powerpc
,
1987 bfd_mach_ppc
, num_registers (registers_powerpc
), registers_powerpc
},
1988 {"power", "POWER user-level", bfd_arch_rs6000
,
1989 bfd_mach_rs6k
, num_registers (registers_power
), registers_power
},
1990 {"403", "IBM PowerPC 403", bfd_arch_powerpc
,
1991 bfd_mach_ppc_403
, num_registers (registers_403
), registers_403
},
1992 {"601", "Motorola PowerPC 601", bfd_arch_powerpc
,
1993 bfd_mach_ppc_601
, num_registers (registers_601
), registers_601
},
1994 {"602", "Motorola PowerPC 602", bfd_arch_powerpc
,
1995 bfd_mach_ppc_602
, num_registers (registers_602
), registers_602
},
1996 {"603", "Motorola/IBM PowerPC 603 or 603e", bfd_arch_powerpc
,
1997 bfd_mach_ppc_603
, num_registers (registers_603
), registers_603
},
1998 {"604", "Motorola PowerPC 604 or 604e", bfd_arch_powerpc
,
1999 604, num_registers (registers_604
), registers_604
},
2000 {"403GC", "IBM PowerPC 403GC", bfd_arch_powerpc
,
2001 bfd_mach_ppc_403gc
, num_registers (registers_403GC
), registers_403GC
},
2002 {"505", "Motorola PowerPC 505", bfd_arch_powerpc
,
2003 bfd_mach_ppc_505
, num_registers (registers_505
), registers_505
},
2004 {"860", "Motorola PowerPC 860 or 850", bfd_arch_powerpc
,
2005 bfd_mach_ppc_860
, num_registers (registers_860
), registers_860
},
2006 {"750", "Motorola/IBM PowerPC 750 or 740", bfd_arch_powerpc
,
2007 bfd_mach_ppc_750
, num_registers (registers_750
), registers_750
},
2009 /* FIXME: I haven't checked the register sets of the following. */
2010 {"620", "Motorola PowerPC 620", bfd_arch_powerpc
,
2011 bfd_mach_ppc_620
, num_registers (registers_powerpc
), registers_powerpc
},
2012 {"a35", "PowerPC A35", bfd_arch_powerpc
,
2013 bfd_mach_ppc_a35
, num_registers (registers_powerpc
), registers_powerpc
},
2014 {"rs1", "IBM POWER RS1", bfd_arch_rs6000
,
2015 bfd_mach_rs6k_rs1
, num_registers (registers_power
), registers_power
},
2016 {"rsc", "IBM POWER RSC", bfd_arch_rs6000
,
2017 bfd_mach_rs6k_rsc
, num_registers (registers_power
), registers_power
},
2018 {"rs2", "IBM POWER RS2", bfd_arch_rs6000
,
2019 bfd_mach_rs6k_rs2
, num_registers (registers_power
), registers_power
},
2024 #undef num_registers
2026 /* Look up the variant named NAME in the `variants' table. Return a
2027 pointer to the struct variant, or null if we couldn't find it. */
2029 static const struct variant
*
2030 find_variant_by_name (char *name
)
2032 const struct variant
*v
;
2034 for (v
= variants
; v
->name
; v
++)
2035 if (!strcmp (name
, v
->name
))
2041 /* Return the variant corresponding to architecture ARCH and machine number
2042 MACH. If no such variant exists, return null. */
2044 static const struct variant
*
2045 find_variant_by_arch (enum bfd_architecture arch
, unsigned long mach
)
2047 const struct variant
*v
;
2049 for (v
= variants
; v
->name
; v
++)
2050 if (arch
== v
->arch
&& mach
== v
->mach
)
2060 process_note_abi_tag_sections (bfd
*abfd
, asection
*sect
, void *obj
)
2062 int *os_ident_ptr
= obj
;
2064 unsigned int sectsize
;
2066 name
= bfd_get_section_name (abfd
, sect
);
2067 sectsize
= bfd_section_size (abfd
, sect
);
2068 if (strcmp (name
, ".note.ABI-tag") == 0 && sectsize
> 0)
2070 unsigned int name_length
, data_length
, note_type
;
2071 char *note
= alloca (sectsize
);
2073 bfd_get_section_contents (abfd
, sect
, note
,
2074 (file_ptr
) 0, (bfd_size_type
) sectsize
);
2076 name_length
= bfd_h_get_32 (abfd
, note
);
2077 data_length
= bfd_h_get_32 (abfd
, note
+ 4);
2078 note_type
= bfd_h_get_32 (abfd
, note
+ 8);
2080 if (name_length
== 4 && data_length
== 16 && note_type
== 1
2081 && strcmp (note
+ 12, "GNU") == 0)
2083 int os_number
= bfd_h_get_32 (abfd
, note
+ 16);
2085 /* The case numbers are from abi-tags in glibc */
2089 *os_ident_ptr
= ELFOSABI_LINUX
;
2092 *os_ident_ptr
= ELFOSABI_HURD
;
2095 *os_ident_ptr
= ELFOSABI_SOLARIS
;
2098 internal_error (__FILE__
, __LINE__
,
2099 "process_note_abi_sections: unknown OS number %d",
2107 /* Return one of the ELFOSABI_ constants for BFDs representing ELF
2108 executables. If it's not an ELF executable or if the OS/ABI couldn't
2109 be determined, simply return -1. */
2112 get_elfosabi (bfd
*abfd
)
2116 if (abfd
!= NULL
&& bfd_get_flavour (abfd
) == bfd_target_elf_flavour
)
2118 elfosabi
= elf_elfheader (abfd
)->e_ident
[EI_OSABI
];
2120 /* When elfosabi is 0 (ELFOSABI_NONE), this is supposed to indicate
2121 that we're on a SYSV system. However, GNU/Linux uses a note section
2122 to record OS/ABI info, but leaves e_ident[EI_OSABI] zero. So we
2123 have to check the note sections too. */
2126 bfd_map_over_sections (abfd
,
2127 process_note_abi_tag_sections
,
2137 /* Initialize the current architecture based on INFO. If possible, re-use an
2138 architecture from ARCHES, which is a list of architectures already created
2139 during this debugging session.
2141 Called e.g. at program startup, when reading a core file, and when reading
2144 static struct gdbarch
*
2145 rs6000_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
2147 struct gdbarch
*gdbarch
;
2148 struct gdbarch_tdep
*tdep
;
2149 int wordsize
, from_xcoff_exec
, from_elf_exec
, power
, i
, off
;
2151 const struct variant
*v
;
2152 enum bfd_architecture arch
;
2155 int osabi
, sysv_abi
;
2157 from_xcoff_exec
= info
.abfd
&& info
.abfd
->format
== bfd_object
&&
2158 bfd_get_flavour (info
.abfd
) == bfd_target_xcoff_flavour
;
2160 from_elf_exec
= info
.abfd
&& info
.abfd
->format
== bfd_object
&&
2161 bfd_get_flavour (info
.abfd
) == bfd_target_elf_flavour
;
2163 sysv_abi
= info
.abfd
&& bfd_get_flavour (info
.abfd
) == bfd_target_elf_flavour
;
2165 osabi
= get_elfosabi (info
.abfd
);
2167 /* Check word size. If INFO is from a binary file, infer it from
2168 that, else choose a likely default. */
2169 if (from_xcoff_exec
)
2171 if (xcoff_data (info
.abfd
)->xcoff64
)
2176 else if (from_elf_exec
)
2178 if (elf_elfheader (info
.abfd
)->e_ident
[EI_CLASS
] == ELFCLASS64
)
2188 /* Find a candidate among extant architectures. */
2189 for (arches
= gdbarch_list_lookup_by_info (arches
, &info
);
2191 arches
= gdbarch_list_lookup_by_info (arches
->next
, &info
))
2193 /* Word size in the various PowerPC bfd_arch_info structs isn't
2194 meaningful, because 64-bit CPUs can run in 32-bit mode. So, perform
2195 separate word size check. */
2196 tdep
= gdbarch_tdep (arches
->gdbarch
);
2197 if (tdep
&& tdep
->wordsize
== wordsize
&& tdep
->osabi
== osabi
)
2198 return arches
->gdbarch
;
2201 /* None found, create a new architecture from INFO, whose bfd_arch_info
2202 validity depends on the source:
2203 - executable useless
2204 - rs6000_host_arch() good
2206 - "set arch" trust blindly
2207 - GDB startup useless but harmless */
2209 if (!from_xcoff_exec
)
2211 arch
= info
.bfd_arch_info
->arch
;
2212 mach
= info
.bfd_arch_info
->mach
;
2216 arch
= bfd_arch_powerpc
;
2218 bfd_default_set_arch_mach (&abfd
, arch
, mach
);
2219 info
.bfd_arch_info
= bfd_get_arch_info (&abfd
);
2221 tdep
= xmalloc (sizeof (struct gdbarch_tdep
));
2222 tdep
->wordsize
= wordsize
;
2223 tdep
->osabi
= osabi
;
2224 gdbarch
= gdbarch_alloc (&info
, tdep
);
2225 power
= arch
== bfd_arch_rs6000
;
2227 /* Select instruction printer. */
2228 tm_print_insn
= arch
== power
? print_insn_rs6000
:
2229 info
.byte_order
== BIG_ENDIAN
? print_insn_big_powerpc
:
2230 print_insn_little_powerpc
;
2232 /* Choose variant. */
2233 v
= find_variant_by_arch (arch
, mach
);
2235 v
= find_variant_by_name (power
? "power" : "powerpc");
2236 tdep
->regs
= v
->regs
;
2238 /* Calculate byte offsets in raw register array. */
2239 tdep
->regoff
= xmalloc (v
->nregs
* sizeof (int));
2240 for (i
= off
= 0; i
< v
->nregs
; i
++)
2242 tdep
->regoff
[i
] = off
;
2243 off
+= regsize (v
->regs
+ i
, wordsize
);
2246 set_gdbarch_read_pc (gdbarch
, generic_target_read_pc
);
2247 set_gdbarch_write_pc (gdbarch
, generic_target_write_pc
);
2248 set_gdbarch_read_fp (gdbarch
, generic_target_read_fp
);
2249 set_gdbarch_write_fp (gdbarch
, generic_target_write_fp
);
2250 set_gdbarch_read_sp (gdbarch
, generic_target_read_sp
);
2251 set_gdbarch_write_sp (gdbarch
, generic_target_write_sp
);
2253 set_gdbarch_num_regs (gdbarch
, v
->nregs
);
2254 set_gdbarch_sp_regnum (gdbarch
, 1);
2255 set_gdbarch_fp_regnum (gdbarch
, 1);
2256 set_gdbarch_pc_regnum (gdbarch
, 64);
2257 set_gdbarch_register_name (gdbarch
, rs6000_register_name
);
2258 set_gdbarch_register_size (gdbarch
, wordsize
);
2259 set_gdbarch_register_bytes (gdbarch
, off
);
2260 set_gdbarch_register_byte (gdbarch
, rs6000_register_byte
);
2261 set_gdbarch_register_raw_size (gdbarch
, rs6000_register_raw_size
);
2262 set_gdbarch_max_register_raw_size (gdbarch
, 8);
2263 set_gdbarch_register_virtual_size (gdbarch
, rs6000_register_virtual_size
);
2264 set_gdbarch_max_register_virtual_size (gdbarch
, 8);
2265 set_gdbarch_register_virtual_type (gdbarch
, rs6000_register_virtual_type
);
2267 set_gdbarch_ptr_bit (gdbarch
, wordsize
* TARGET_CHAR_BIT
);
2268 set_gdbarch_short_bit (gdbarch
, 2 * TARGET_CHAR_BIT
);
2269 set_gdbarch_int_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
2270 set_gdbarch_long_bit (gdbarch
, wordsize
* TARGET_CHAR_BIT
);
2271 set_gdbarch_long_long_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2272 set_gdbarch_float_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
2273 set_gdbarch_double_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2274 set_gdbarch_long_double_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2276 set_gdbarch_use_generic_dummy_frames (gdbarch
, 1);
2277 set_gdbarch_call_dummy_length (gdbarch
, 0);
2278 set_gdbarch_call_dummy_location (gdbarch
, AT_ENTRY_POINT
);
2279 set_gdbarch_call_dummy_address (gdbarch
, entry_point_address
);
2280 set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch
, 1);
2281 set_gdbarch_call_dummy_breakpoint_offset (gdbarch
, 0);
2282 set_gdbarch_call_dummy_start_offset (gdbarch
, 0);
2283 set_gdbarch_pc_in_call_dummy (gdbarch
, generic_pc_in_call_dummy
);
2284 set_gdbarch_call_dummy_p (gdbarch
, 1);
2285 set_gdbarch_call_dummy_stack_adjust_p (gdbarch
, 0);
2286 set_gdbarch_get_saved_register (gdbarch
, generic_get_saved_register
);
2287 set_gdbarch_fix_call_dummy (gdbarch
, rs6000_fix_call_dummy
);
2288 set_gdbarch_push_dummy_frame (gdbarch
, generic_push_dummy_frame
);
2289 set_gdbarch_save_dummy_frame_tos (gdbarch
, generic_save_dummy_frame_tos
);
2290 set_gdbarch_push_return_address (gdbarch
, ppc_push_return_address
);
2291 set_gdbarch_believe_pcc_promotion (gdbarch
, 1);
2292 set_gdbarch_coerce_float_to_double (gdbarch
, rs6000_coerce_float_to_double
);
2294 set_gdbarch_register_convertible (gdbarch
, rs6000_register_convertible
);
2295 set_gdbarch_register_convert_to_virtual (gdbarch
, rs6000_register_convert_to_virtual
);
2296 set_gdbarch_register_convert_to_raw (gdbarch
, rs6000_register_convert_to_raw
);
2298 set_gdbarch_extract_return_value (gdbarch
, rs6000_extract_return_value
);
2301 set_gdbarch_push_arguments (gdbarch
, ppc_sysv_abi_push_arguments
);
2303 set_gdbarch_push_arguments (gdbarch
, rs6000_push_arguments
);
2305 set_gdbarch_store_struct_return (gdbarch
, rs6000_store_struct_return
);
2306 set_gdbarch_store_return_value (gdbarch
, rs6000_store_return_value
);
2307 set_gdbarch_extract_struct_value_address (gdbarch
, rs6000_extract_struct_value_address
);
2308 set_gdbarch_use_struct_convention (gdbarch
, generic_use_struct_convention
);
2310 set_gdbarch_pop_frame (gdbarch
, rs6000_pop_frame
);
2312 set_gdbarch_skip_prologue (gdbarch
, rs6000_skip_prologue
);
2313 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
2314 set_gdbarch_decr_pc_after_break (gdbarch
, 0);
2315 set_gdbarch_function_start_offset (gdbarch
, 0);
2316 set_gdbarch_breakpoint_from_pc (gdbarch
, rs6000_breakpoint_from_pc
);
2318 /* Not sure on this. FIXMEmgo */
2319 set_gdbarch_frame_args_skip (gdbarch
, 8);
2321 set_gdbarch_frame_chain_valid (gdbarch
, file_frame_chain_valid
);
2322 if (osabi
== ELFOSABI_LINUX
)
2324 set_gdbarch_frameless_function_invocation (gdbarch
,
2325 ppc_linux_frameless_function_invocation
);
2326 set_gdbarch_frame_chain (gdbarch
, ppc_linux_frame_chain
);
2327 set_gdbarch_frame_saved_pc (gdbarch
, ppc_linux_frame_saved_pc
);
2329 set_gdbarch_frame_init_saved_regs (gdbarch
,
2330 ppc_linux_frame_init_saved_regs
);
2331 set_gdbarch_init_extra_frame_info (gdbarch
,
2332 ppc_linux_init_extra_frame_info
);
2334 set_gdbarch_memory_remove_breakpoint (gdbarch
,
2335 ppc_linux_memory_remove_breakpoint
);
2339 set_gdbarch_frameless_function_invocation (gdbarch
,
2340 rs6000_frameless_function_invocation
);
2341 set_gdbarch_frame_chain (gdbarch
, rs6000_frame_chain
);
2342 set_gdbarch_frame_saved_pc (gdbarch
, rs6000_frame_saved_pc
);
2344 set_gdbarch_frame_init_saved_regs (gdbarch
, rs6000_frame_init_saved_regs
);
2345 set_gdbarch_init_extra_frame_info (gdbarch
, rs6000_init_extra_frame_info
);
2347 /* Handle RS/6000 function pointers. */
2348 set_gdbarch_convert_from_func_ptr_addr (gdbarch
,
2349 rs6000_convert_from_func_ptr_addr
);
2351 set_gdbarch_frame_args_address (gdbarch
, rs6000_frame_args_address
);
2352 set_gdbarch_frame_locals_address (gdbarch
, rs6000_frame_args_address
);
2353 set_gdbarch_saved_pc_after_call (gdbarch
, rs6000_saved_pc_after_call
);
2355 /* We can't tell how many args there are
2356 now that the C compiler delays popping them. */
2357 set_gdbarch_frame_num_args (gdbarch
, frame_num_args_unknown
);
2362 /* Initialization code. */
2365 _initialize_rs6000_tdep (void)
2367 register_gdbarch_init (bfd_arch_rs6000
, rs6000_gdbarch_init
);
2368 register_gdbarch_init (bfd_arch_powerpc
, rs6000_gdbarch_init
);