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"
36 #include "bfd/libbfd.h" /* for bfd_default_set_arch_mach */
37 #include "coff/internal.h" /* for libcoff.h */
38 #include "bfd/libcoff.h" /* for xcoff_data */
44 /* If the kernel has to deliver a signal, it pushes a sigcontext
45 structure on the stack and then calls the signal handler, passing
46 the address of the sigcontext in an argument register. Usually
47 the signal handler doesn't save this register, so we have to
48 access the sigcontext structure via an offset from the signal handler
50 The following constants were determined by experimentation on AIX 3.2. */
51 #define SIG_FRAME_PC_OFFSET 96
52 #define SIG_FRAME_LR_OFFSET 108
53 #define SIG_FRAME_FP_OFFSET 284
55 /* To be used by skip_prologue. */
57 struct rs6000_framedata
59 int offset
; /* total size of frame --- the distance
60 by which we decrement sp to allocate
62 int saved_gpr
; /* smallest # of saved gpr */
63 int saved_fpr
; /* smallest # of saved fpr */
64 int alloca_reg
; /* alloca register number (frame ptr) */
65 char frameless
; /* true if frameless functions. */
66 char nosavedpc
; /* true if pc not saved. */
67 int gpr_offset
; /* offset of saved gprs from prev sp */
68 int fpr_offset
; /* offset of saved fprs from prev sp */
69 int lr_offset
; /* offset of saved lr */
70 int cr_offset
; /* offset of saved cr */
73 /* Description of a single register. */
77 char *name
; /* name of register */
78 unsigned char sz32
; /* size on 32-bit arch, 0 if nonextant */
79 unsigned char sz64
; /* size on 64-bit arch, 0 if nonextant */
80 unsigned char fpr
; /* whether register is floating-point */
83 /* Private data that this module attaches to struct gdbarch. */
87 int wordsize
; /* size in bytes of fixed-point word */
88 int osabi
; /* OS / ABI from ELF header */
89 int *regoff
; /* byte offsets in register arrays */
90 const struct reg
*regs
; /* from current variant */
93 /* Return the current architecture's gdbarch_tdep structure. */
95 #define TDEP gdbarch_tdep (current_gdbarch)
97 /* Breakpoint shadows for the single step instructions will be kept here. */
99 static struct sstep_breaks
101 /* Address, or 0 if this is not in use. */
103 /* Shadow contents. */
108 /* Hook for determining the TOC address when calling functions in the
109 inferior under AIX. The initialization code in rs6000-nat.c sets
110 this hook to point to find_toc_address. */
112 CORE_ADDR (*rs6000_find_toc_address_hook
) (CORE_ADDR
) = NULL
;
114 /* Hook to set the current architecture when starting a child process.
115 rs6000-nat.c sets this. */
117 void (*rs6000_set_host_arch_hook
) (int) = NULL
;
119 /* Static function prototypes */
121 static CORE_ADDR
branch_dest (int opcode
, int instr
, CORE_ADDR pc
,
123 static CORE_ADDR
skip_prologue (CORE_ADDR
, CORE_ADDR
,
124 struct rs6000_framedata
*);
125 static void frame_get_saved_regs (struct frame_info
* fi
,
126 struct rs6000_framedata
* fdatap
);
127 static CORE_ADDR
frame_initial_stack_address (struct frame_info
*);
129 /* Read a LEN-byte address from debugged memory address MEMADDR. */
132 read_memory_addr (CORE_ADDR memaddr
, int len
)
134 return read_memory_unsigned_integer (memaddr
, len
);
138 rs6000_skip_prologue (CORE_ADDR pc
)
140 struct rs6000_framedata frame
;
141 pc
= skip_prologue (pc
, 0, &frame
);
146 /* Fill in fi->saved_regs */
148 struct frame_extra_info
150 /* Functions calling alloca() change the value of the stack
151 pointer. We need to use initial stack pointer (which is saved in
152 r31 by gcc) in such cases. If a compiler emits traceback table,
153 then we should use the alloca register specified in traceback
155 CORE_ADDR initial_sp
; /* initial stack pointer. */
159 rs6000_init_extra_frame_info (int fromleaf
, struct frame_info
*fi
)
161 fi
->extra_info
= (struct frame_extra_info
*)
162 frame_obstack_alloc (sizeof (struct frame_extra_info
));
163 fi
->extra_info
->initial_sp
= 0;
164 if (fi
->next
!= (CORE_ADDR
) 0
165 && fi
->pc
< TEXT_SEGMENT_BASE
)
166 /* We're in get_prev_frame */
167 /* and this is a special signal frame. */
168 /* (fi->pc will be some low address in the kernel, */
169 /* to which the signal handler returns). */
170 fi
->signal_handler_caller
= 1;
173 /* Put here the code to store, into a struct frame_saved_regs,
174 the addresses of the saved registers of frame described by FRAME_INFO.
175 This includes special registers such as pc and fp saved in special
176 ways in the stack frame. sp is even more special:
177 the address we return for it IS the sp for the next frame. */
179 /* In this implementation for RS/6000, we do *not* save sp. I am
180 not sure if it will be needed. The following function takes care of gpr's
184 rs6000_frame_init_saved_regs (struct frame_info
*fi
)
186 frame_get_saved_regs (fi
, NULL
);
190 rs6000_frame_args_address (struct frame_info
*fi
)
192 if (fi
->extra_info
->initial_sp
!= 0)
193 return fi
->extra_info
->initial_sp
;
195 return frame_initial_stack_address (fi
);
198 /* Immediately after a function call, return the saved pc.
199 Can't go through the frames for this because on some machines
200 the new frame is not set up until the new function executes
201 some instructions. */
204 rs6000_saved_pc_after_call (struct frame_info
*fi
)
206 return read_register (PPC_LR_REGNUM
);
209 /* Calculate the destination of a branch/jump. Return -1 if not a branch. */
212 branch_dest (int opcode
, int instr
, CORE_ADDR pc
, CORE_ADDR safety
)
219 absolute
= (int) ((instr
>> 1) & 1);
224 immediate
= ((instr
& ~3) << 6) >> 6; /* br unconditional */
228 dest
= pc
+ immediate
;
232 immediate
= ((instr
& ~3) << 16) >> 16; /* br conditional */
236 dest
= pc
+ immediate
;
240 ext_op
= (instr
>> 1) & 0x3ff;
242 if (ext_op
== 16) /* br conditional register */
244 dest
= read_register (PPC_LR_REGNUM
) & ~3;
246 /* If we are about to return from a signal handler, dest is
247 something like 0x3c90. The current frame is a signal handler
248 caller frame, upon completion of the sigreturn system call
249 execution will return to the saved PC in the frame. */
250 if (dest
< TEXT_SEGMENT_BASE
)
252 struct frame_info
*fi
;
254 fi
= get_current_frame ();
256 dest
= read_memory_addr (fi
->frame
+ SIG_FRAME_PC_OFFSET
,
261 else if (ext_op
== 528) /* br cond to count reg */
263 dest
= read_register (PPC_CTR_REGNUM
) & ~3;
265 /* If we are about to execute a system call, dest is something
266 like 0x22fc or 0x3b00. Upon completion the system call
267 will return to the address in the link register. */
268 if (dest
< TEXT_SEGMENT_BASE
)
269 dest
= read_register (PPC_LR_REGNUM
) & ~3;
278 return (dest
< TEXT_SEGMENT_BASE
) ? safety
: dest
;
282 /* Sequence of bytes for breakpoint instruction. */
284 #define BIG_BREAKPOINT { 0x7d, 0x82, 0x10, 0x08 }
285 #define LITTLE_BREAKPOINT { 0x08, 0x10, 0x82, 0x7d }
287 static unsigned char *
288 rs6000_breakpoint_from_pc (CORE_ADDR
*bp_addr
, int *bp_size
)
290 static unsigned char big_breakpoint
[] = BIG_BREAKPOINT
;
291 static unsigned char little_breakpoint
[] = LITTLE_BREAKPOINT
;
293 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
)
294 return big_breakpoint
;
296 return little_breakpoint
;
300 /* AIX does not support PT_STEP. Simulate it. */
303 rs6000_software_single_step (enum target_signal signal
,
304 int insert_breakpoints_p
)
306 #define INSNLEN(OPCODE) 4
308 static char le_breakp
[] = LITTLE_BREAKPOINT
;
309 static char be_breakp
[] = BIG_BREAKPOINT
;
310 char *breakp
= TARGET_BYTE_ORDER
== BIG_ENDIAN
? be_breakp
: le_breakp
;
316 if (insert_breakpoints_p
)
321 insn
= read_memory_integer (loc
, 4);
323 breaks
[0] = loc
+ INSNLEN (insn
);
325 breaks
[1] = branch_dest (opcode
, insn
, loc
, breaks
[0]);
327 /* Don't put two breakpoints on the same address. */
328 if (breaks
[1] == breaks
[0])
331 stepBreaks
[1].address
= 0;
333 for (ii
= 0; ii
< 2; ++ii
)
336 /* ignore invalid breakpoint. */
337 if (breaks
[ii
] == -1)
340 read_memory (breaks
[ii
], stepBreaks
[ii
].data
, 4);
342 write_memory (breaks
[ii
], breakp
, 4);
343 stepBreaks
[ii
].address
= breaks
[ii
];
350 /* remove step breakpoints. */
351 for (ii
= 0; ii
< 2; ++ii
)
352 if (stepBreaks
[ii
].address
!= 0)
354 (stepBreaks
[ii
].address
, stepBreaks
[ii
].data
, 4);
357 errno
= 0; /* FIXME, don't ignore errors! */
358 /* What errors? {read,write}_memory call error(). */
362 /* return pc value after skipping a function prologue and also return
363 information about a function frame.
365 in struct rs6000_framedata fdata:
366 - frameless is TRUE, if function does not have a frame.
367 - nosavedpc is TRUE, if function does not save %pc value in its frame.
368 - offset is the initial size of this stack frame --- the amount by
369 which we decrement the sp to allocate the frame.
370 - saved_gpr is the number of the first saved gpr.
371 - saved_fpr is the number of the first saved fpr.
372 - alloca_reg is the number of the register used for alloca() handling.
374 - gpr_offset is the offset of the first saved gpr from the previous frame.
375 - fpr_offset is the offset of the first saved fpr from the previous frame.
376 - lr_offset is the offset of the saved lr
377 - cr_offset is the offset of the saved cr
380 #define SIGNED_SHORT(x) \
381 ((sizeof (short) == 2) \
382 ? ((int)(short)(x)) \
383 : ((int)((((x) & 0xffff) ^ 0x8000) - 0x8000)))
385 #define GET_SRC_REG(x) (((x) >> 21) & 0x1f)
387 /* Limit the number of skipped non-prologue instructions, as the examining
388 of the prologue is expensive. */
389 static int max_skip_non_prologue_insns
= 10;
391 /* Given PC representing the starting address of a function, and
392 LIM_PC which is the (sloppy) limit to which to scan when looking
393 for a prologue, attempt to further refine this limit by using
394 the line data in the symbol table. If successful, a better guess
395 on where the prologue ends is returned, otherwise the previous
396 value of lim_pc is returned. */
398 refine_prologue_limit (CORE_ADDR pc
, CORE_ADDR lim_pc
)
400 struct symtab_and_line prologue_sal
;
402 prologue_sal
= find_pc_line (pc
, 0);
403 if (prologue_sal
.line
!= 0)
406 CORE_ADDR addr
= prologue_sal
.end
;
408 /* Handle the case in which compiler's optimizer/scheduler
409 has moved instructions into the prologue. We scan ahead
410 in the function looking for address ranges whose corresponding
411 line number is less than or equal to the first one that we
412 found for the function. (It can be less than when the
413 scheduler puts a body instruction before the first prologue
415 for (i
= 2 * max_skip_non_prologue_insns
;
416 i
> 0 && (lim_pc
== 0 || addr
< lim_pc
);
419 struct symtab_and_line sal
;
421 sal
= find_pc_line (addr
, 0);
424 if (sal
.line
<= prologue_sal
.line
425 && sal
.symtab
== prologue_sal
.symtab
)
432 if (lim_pc
== 0 || prologue_sal
.end
< lim_pc
)
433 lim_pc
= prologue_sal
.end
;
440 skip_prologue (CORE_ADDR pc
, CORE_ADDR lim_pc
, struct rs6000_framedata
*fdata
)
442 CORE_ADDR orig_pc
= pc
;
443 CORE_ADDR last_prologue_pc
= pc
;
451 int minimal_toc_loaded
= 0;
452 int prev_insn_was_prologue_insn
= 1;
453 int num_skip_non_prologue_insns
= 0;
455 /* Attempt to find the end of the prologue when no limit is specified.
456 Note that refine_prologue_limit() has been written so that it may
457 be used to "refine" the limits of non-zero PC values too, but this
458 is only safe if we 1) trust the line information provided by the
459 compiler and 2) iterate enough to actually find the end of the
462 It may become a good idea at some point (for both performance and
463 accuracy) to unconditionally call refine_prologue_limit(). But,
464 until we can make a clear determination that this is beneficial,
465 we'll play it safe and only use it to obtain a limit when none
466 has been specified. */
468 lim_pc
= refine_prologue_limit (pc
, lim_pc
);
470 memset (fdata
, 0, sizeof (struct rs6000_framedata
));
471 fdata
->saved_gpr
= -1;
472 fdata
->saved_fpr
= -1;
473 fdata
->alloca_reg
= -1;
474 fdata
->frameless
= 1;
475 fdata
->nosavedpc
= 1;
479 /* Sometimes it isn't clear if an instruction is a prologue
480 instruction or not. When we encounter one of these ambiguous
481 cases, we'll set prev_insn_was_prologue_insn to 0 (false).
482 Otherwise, we'll assume that it really is a prologue instruction. */
483 if (prev_insn_was_prologue_insn
)
484 last_prologue_pc
= pc
;
486 /* Stop scanning if we've hit the limit. */
487 if (lim_pc
!= 0 && pc
>= lim_pc
)
490 prev_insn_was_prologue_insn
= 1;
492 /* Fetch the instruction and convert it to an integer. */
493 if (target_read_memory (pc
, buf
, 4))
495 op
= extract_signed_integer (buf
, 4);
497 if ((op
& 0xfc1fffff) == 0x7c0802a6)
499 lr_reg
= (op
& 0x03e00000) | 0x90010000;
503 else if ((op
& 0xfc1fffff) == 0x7c000026)
505 cr_reg
= (op
& 0x03e00000) | 0x90010000;
509 else if ((op
& 0xfc1f0000) == 0xd8010000)
510 { /* stfd Rx,NUM(r1) */
511 reg
= GET_SRC_REG (op
);
512 if (fdata
->saved_fpr
== -1 || fdata
->saved_fpr
> reg
)
514 fdata
->saved_fpr
= reg
;
515 fdata
->fpr_offset
= SIGNED_SHORT (op
) + offset
;
520 else if (((op
& 0xfc1f0000) == 0xbc010000) || /* stm Rx, NUM(r1) */
521 (((op
& 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
522 (op
& 0xfc1f0003) == 0xf8010000) && /* std rx,NUM(r1) */
523 (op
& 0x03e00000) >= 0x01a00000)) /* rx >= r13 */
526 reg
= GET_SRC_REG (op
);
527 if (fdata
->saved_gpr
== -1 || fdata
->saved_gpr
> reg
)
529 fdata
->saved_gpr
= reg
;
530 if ((op
& 0xfc1f0003) == 0xf8010000)
532 fdata
->gpr_offset
= SIGNED_SHORT (op
) + offset
;
537 else if ((op
& 0xffff0000) == 0x60000000)
540 /* Allow nops in the prologue, but do not consider them to
541 be part of the prologue unless followed by other prologue
543 prev_insn_was_prologue_insn
= 0;
547 else if ((op
& 0xffff0000) == 0x3c000000)
548 { /* addis 0,0,NUM, used
550 fdata
->offset
= (op
& 0x0000ffff) << 16;
551 fdata
->frameless
= 0;
555 else if ((op
& 0xffff0000) == 0x60000000)
556 { /* ori 0,0,NUM, 2nd ha
557 lf of >= 32k frames */
558 fdata
->offset
|= (op
& 0x0000ffff);
559 fdata
->frameless
= 0;
563 else if (lr_reg
!= -1 && (op
& 0xffff0000) == lr_reg
)
566 fdata
->lr_offset
= SIGNED_SHORT (op
) + offset
;
567 fdata
->nosavedpc
= 0;
572 else if (cr_reg
!= -1 && (op
& 0xffff0000) == cr_reg
)
575 fdata
->cr_offset
= SIGNED_SHORT (op
) + offset
;
580 else if (op
== 0x48000005)
586 else if (op
== 0x48000004)
591 else if (((op
& 0xffff0000) == 0x801e0000 || /* lwz 0,NUM(r30), used
592 in V.4 -mrelocatable */
593 op
== 0x7fc0f214) && /* add r30,r0,r30, used
594 in V.4 -mrelocatable */
595 lr_reg
== 0x901e0000)
600 else if ((op
& 0xffff0000) == 0x3fc00000 || /* addis 30,0,foo@ha, used
601 in V.4 -mminimal-toc */
602 (op
& 0xffff0000) == 0x3bde0000)
603 { /* addi 30,30,foo@l */
607 else if ((op
& 0xfc000001) == 0x48000001)
611 fdata
->frameless
= 0;
612 /* Don't skip over the subroutine call if it is not within the first
613 three instructions of the prologue. */
614 if ((pc
- orig_pc
) > 8)
617 op
= read_memory_integer (pc
+ 4, 4);
619 /* At this point, make sure this is not a trampoline function
620 (a function that simply calls another functions, and nothing else).
621 If the next is not a nop, this branch was part of the function
624 if (op
== 0x4def7b82 || op
== 0) /* crorc 15, 15, 15 */
625 break; /* don't skip over
629 /* update stack pointer */
631 else if ((op
& 0xffff0000) == 0x94210000 || /* stu r1,NUM(r1) */
632 (op
& 0xffff0003) == 0xf8210001) /* stdu r1,NUM(r1) */
634 fdata
->frameless
= 0;
635 if ((op
& 0xffff0003) == 0xf8210001)
637 fdata
->offset
= SIGNED_SHORT (op
);
638 offset
= fdata
->offset
;
642 else if (op
== 0x7c21016e)
644 fdata
->frameless
= 0;
645 offset
= fdata
->offset
;
648 /* Load up minimal toc pointer */
650 else if ((op
>> 22) == 0x20f
651 && !minimal_toc_loaded
)
652 { /* l r31,... or l r30,... */
653 minimal_toc_loaded
= 1;
656 /* move parameters from argument registers to local variable
659 else if ((op
& 0xfc0007fe) == 0x7c000378 && /* mr(.) Rx,Ry */
660 (((op
>> 21) & 31) >= 3) && /* R3 >= Ry >= R10 */
661 (((op
>> 21) & 31) <= 10) &&
662 (((op
>> 16) & 31) >= fdata
->saved_gpr
)) /* Rx: local var reg */
666 /* store parameters in stack */
668 else if ((op
& 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
669 (op
& 0xfc1f0003) == 0xf8010000 || /* std rx,NUM(r1) */
670 (op
& 0xfc1f0000) == 0xd8010000 || /* stfd Rx,NUM(r1) */
671 (op
& 0xfc1f0000) == 0xfc010000) /* frsp, fp?,NUM(r1) */
675 /* store parameters in stack via frame pointer */
678 ((op
& 0xfc1f0000) == 0x901f0000 || /* st rx,NUM(r1) */
679 (op
& 0xfc1f0000) == 0xd81f0000 || /* stfd Rx,NUM(r1) */
680 (op
& 0xfc1f0000) == 0xfc1f0000))
681 { /* frsp, fp?,NUM(r1) */
684 /* Set up frame pointer */
686 else if (op
== 0x603f0000 /* oril r31, r1, 0x0 */
689 fdata
->frameless
= 0;
691 fdata
->alloca_reg
= 31;
694 /* Another way to set up the frame pointer. */
696 else if ((op
& 0xfc1fffff) == 0x38010000)
697 { /* addi rX, r1, 0x0 */
698 fdata
->frameless
= 0;
700 fdata
->alloca_reg
= (op
& ~0x38010000) >> 21;
706 /* Not a recognized prologue instruction.
707 Handle optimizer code motions into the prologue by continuing
708 the search if we have no valid frame yet or if the return
709 address is not yet saved in the frame. */
710 if (fdata
->frameless
== 0
711 && (lr_reg
== -1 || fdata
->nosavedpc
== 0))
714 if (op
== 0x4e800020 /* blr */
715 || op
== 0x4e800420) /* bctr */
716 /* Do not scan past epilogue in frameless functions or
719 if ((op
& 0xf4000000) == 0x40000000) /* bxx */
720 /* Never skip branches. */
723 if (num_skip_non_prologue_insns
++ > max_skip_non_prologue_insns
)
724 /* Do not scan too many insns, scanning insns is expensive with
728 /* Continue scanning. */
729 prev_insn_was_prologue_insn
= 0;
735 /* I have problems with skipping over __main() that I need to address
736 * sometime. Previously, I used to use misc_function_vector which
737 * didn't work as well as I wanted to be. -MGO */
739 /* If the first thing after skipping a prolog is a branch to a function,
740 this might be a call to an initializer in main(), introduced by gcc2.
741 We'd like to skip over it as well. Fortunately, xlc does some extra
742 work before calling a function right after a prologue, thus we can
743 single out such gcc2 behaviour. */
746 if ((op
& 0xfc000001) == 0x48000001)
747 { /* bl foo, an initializer function? */
748 op
= read_memory_integer (pc
+ 4, 4);
750 if (op
== 0x4def7b82)
751 { /* cror 0xf, 0xf, 0xf (nop) */
753 /* check and see if we are in main. If so, skip over this initializer
756 tmp
= find_pc_misc_function (pc
);
757 if (tmp
>= 0 && STREQ (misc_function_vector
[tmp
].name
, main_name ()))
763 fdata
->offset
= -fdata
->offset
;
764 return last_prologue_pc
;
768 /*************************************************************************
769 Support for creating pushing a dummy frame into the stack, and popping
771 *************************************************************************/
774 /* Pop the innermost frame, go back to the caller. */
777 rs6000_pop_frame (void)
779 CORE_ADDR pc
, lr
, sp
, prev_sp
, addr
; /* %pc, %lr, %sp */
780 struct rs6000_framedata fdata
;
781 struct frame_info
*frame
= get_current_frame ();
785 sp
= FRAME_FP (frame
);
787 if (PC_IN_CALL_DUMMY (frame
->pc
, frame
->frame
, frame
->frame
))
789 generic_pop_dummy_frame ();
790 flush_cached_frames ();
794 /* Make sure that all registers are valid. */
795 read_register_bytes (0, NULL
, REGISTER_BYTES
);
797 /* figure out previous %pc value. If the function is frameless, it is
798 still in the link register, otherwise walk the frames and retrieve the
799 saved %pc value in the previous frame. */
801 addr
= get_pc_function_start (frame
->pc
);
802 (void) skip_prologue (addr
, frame
->pc
, &fdata
);
804 wordsize
= TDEP
->wordsize
;
808 prev_sp
= read_memory_addr (sp
, wordsize
);
809 if (fdata
.lr_offset
== 0)
810 lr
= read_register (PPC_LR_REGNUM
);
812 lr
= read_memory_addr (prev_sp
+ fdata
.lr_offset
, wordsize
);
814 /* reset %pc value. */
815 write_register (PC_REGNUM
, lr
);
817 /* reset register values if any was saved earlier. */
819 if (fdata
.saved_gpr
!= -1)
821 addr
= prev_sp
+ fdata
.gpr_offset
;
822 for (ii
= fdata
.saved_gpr
; ii
<= 31; ++ii
)
824 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
)], wordsize
);
829 if (fdata
.saved_fpr
!= -1)
831 addr
= prev_sp
+ fdata
.fpr_offset
;
832 for (ii
= fdata
.saved_fpr
; ii
<= 31; ++ii
)
834 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
+ FP0_REGNUM
)], 8);
839 write_register (SP_REGNUM
, prev_sp
);
840 target_store_registers (-1);
841 flush_cached_frames ();
844 /* Fixup the call sequence of a dummy function, with the real function
845 address. Its arguments will be passed by gdb. */
848 rs6000_fix_call_dummy (char *dummyname
, CORE_ADDR pc
, CORE_ADDR fun
,
849 int nargs
, struct value
**args
, struct type
*type
,
852 #define TOC_ADDR_OFFSET 20
853 #define TARGET_ADDR_OFFSET 28
856 CORE_ADDR target_addr
;
858 if (rs6000_find_toc_address_hook
!= NULL
)
860 CORE_ADDR tocvalue
= (*rs6000_find_toc_address_hook
) (fun
);
861 write_register (PPC_TOC_REGNUM
, tocvalue
);
865 /* Pass the arguments in either registers, or in the stack. In RS/6000,
866 the first eight words of the argument list (that might be less than
867 eight parameters if some parameters occupy more than one word) are
868 passed in r3..r10 registers. float and double parameters are
869 passed in fpr's, in addition to that. Rest of the parameters if any
870 are passed in user stack. There might be cases in which half of the
871 parameter is copied into registers, the other half is pushed into
874 Stack must be aligned on 64-bit boundaries when synthesizing
877 If the function is returning a structure, then the return address is passed
878 in r3, then the first 7 words of the parameters can be passed in registers,
882 rs6000_push_arguments (int nargs
, struct value
**args
, CORE_ADDR sp
,
883 int struct_return
, CORE_ADDR struct_addr
)
887 int argno
; /* current argument number */
888 int argbytes
; /* current argument byte */
890 int f_argno
= 0; /* current floating point argno */
891 int wordsize
= TDEP
->wordsize
;
893 struct value
*arg
= 0;
898 /* The first eight words of ther arguments are passed in registers. Copy
901 If the function is returning a `struct', then the first word (which
902 will be passed in r3) is used for struct return address. In that
903 case we should advance one word and start from r4 register to copy
906 ii
= struct_return
? 1 : 0;
909 effectively indirect call... gcc does...
911 return_val example( float, int);
914 float in fp0, int in r3
915 offset of stack on overflow 8/16
916 for varargs, must go by type.
918 float in r3&r4, int in r5
919 offset of stack on overflow different
921 return in r3 or f0. If no float, must study how gcc emulates floats;
922 pay attention to arg promotion.
923 User may have to cast\args to handle promotion correctly
924 since gdb won't know if prototype supplied or not.
927 for (argno
= 0, argbytes
= 0; argno
< nargs
&& ii
< 8; ++ii
)
929 int reg_size
= REGISTER_RAW_SIZE (ii
+ 3);
932 type
= check_typedef (VALUE_TYPE (arg
));
933 len
= TYPE_LENGTH (type
);
935 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
938 /* floating point arguments are passed in fpr's, as well as gpr's.
939 There are 13 fpr's reserved for passing parameters. At this point
940 there is no way we would run out of them. */
944 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
946 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
+ 1 + f_argno
)],
947 VALUE_CONTENTS (arg
),
955 /* Argument takes more than one register. */
956 while (argbytes
< len
)
958 memset (®isters
[REGISTER_BYTE (ii
+ 3)], 0, reg_size
);
959 memcpy (®isters
[REGISTER_BYTE (ii
+ 3)],
960 ((char *) VALUE_CONTENTS (arg
)) + argbytes
,
961 (len
- argbytes
) > reg_size
962 ? reg_size
: len
- argbytes
);
963 ++ii
, argbytes
+= reg_size
;
966 goto ran_out_of_registers_for_arguments
;
972 { /* Argument can fit in one register. No problem. */
973 int adj
= TARGET_BYTE_ORDER
== BIG_ENDIAN
? reg_size
- len
: 0;
974 memset (®isters
[REGISTER_BYTE (ii
+ 3)], 0, reg_size
);
975 memcpy ((char *)®isters
[REGISTER_BYTE (ii
+ 3)] + adj
,
976 VALUE_CONTENTS (arg
), len
);
981 ran_out_of_registers_for_arguments
:
983 saved_sp
= read_sp ();
984 #ifndef ELF_OBJECT_FORMAT
985 /* location for 8 parameters are always reserved. */
988 /* another six words for back chain, TOC register, link register, etc. */
991 /* stack pointer must be quadword aligned */
995 /* if there are more arguments, allocate space for them in
996 the stack, then push them starting from the ninth one. */
998 if ((argno
< nargs
) || argbytes
)
1004 space
+= ((len
- argbytes
+ 3) & -4);
1010 for (; jj
< nargs
; ++jj
)
1012 struct value
*val
= args
[jj
];
1013 space
+= ((TYPE_LENGTH (VALUE_TYPE (val
))) + 3) & -4;
1016 /* add location required for the rest of the parameters */
1017 space
= (space
+ 15) & -16;
1020 /* This is another instance we need to be concerned about securing our
1021 stack space. If we write anything underneath %sp (r1), we might conflict
1022 with the kernel who thinks he is free to use this area. So, update %sp
1023 first before doing anything else. */
1025 write_register (SP_REGNUM
, sp
);
1027 /* if the last argument copied into the registers didn't fit there
1028 completely, push the rest of it into stack. */
1032 write_memory (sp
+ 24 + (ii
* 4),
1033 ((char *) VALUE_CONTENTS (arg
)) + argbytes
,
1036 ii
+= ((len
- argbytes
+ 3) & -4) / 4;
1039 /* push the rest of the arguments into stack. */
1040 for (; argno
< nargs
; ++argno
)
1044 type
= check_typedef (VALUE_TYPE (arg
));
1045 len
= TYPE_LENGTH (type
);
1048 /* float types should be passed in fpr's, as well as in the stack. */
1049 if (TYPE_CODE (type
) == TYPE_CODE_FLT
&& f_argno
< 13)
1054 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
1056 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
+ 1 + f_argno
)],
1057 VALUE_CONTENTS (arg
),
1062 write_memory (sp
+ 24 + (ii
* 4), (char *) VALUE_CONTENTS (arg
), len
);
1063 ii
+= ((len
+ 3) & -4) / 4;
1067 /* Secure stack areas first, before doing anything else. */
1068 write_register (SP_REGNUM
, sp
);
1070 /* set back chain properly */
1071 store_address (tmp_buffer
, 4, saved_sp
);
1072 write_memory (sp
, tmp_buffer
, 4);
1074 target_store_registers (-1);
1078 /* Function: ppc_push_return_address (pc, sp)
1079 Set up the return address for the inferior function call. */
1082 ppc_push_return_address (CORE_ADDR pc
, CORE_ADDR sp
)
1084 write_register (PPC_LR_REGNUM
, CALL_DUMMY_ADDRESS ());
1088 /* Extract a function return value of type TYPE from raw register array
1089 REGBUF, and copy that return value into VALBUF in virtual format. */
1092 rs6000_extract_return_value (struct type
*valtype
, char *regbuf
, char *valbuf
)
1096 if (TYPE_CODE (valtype
) == TYPE_CODE_FLT
)
1101 /* floats and doubles are returned in fpr1. fpr's have a size of 8 bytes.
1102 We need to truncate the return value into float size (4 byte) if
1105 if (TYPE_LENGTH (valtype
) > 4) /* this is a double */
1107 ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)],
1108 TYPE_LENGTH (valtype
));
1111 memcpy (&dd
, ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)], 8);
1113 memcpy (valbuf
, &ff
, sizeof (float));
1118 /* return value is copied starting from r3. */
1119 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
1120 && TYPE_LENGTH (valtype
) < REGISTER_RAW_SIZE (3))
1121 offset
= REGISTER_RAW_SIZE (3) - TYPE_LENGTH (valtype
);
1124 regbuf
+ REGISTER_BYTE (3) + offset
,
1125 TYPE_LENGTH (valtype
));
1129 /* Keep structure return address in this variable.
1130 FIXME: This is a horrid kludge which should not be allowed to continue
1131 living. This only allows a single nested call to a structure-returning
1132 function. Come on, guys! -- gnu@cygnus.com, Aug 92 */
1134 static CORE_ADDR rs6000_struct_return_address
;
1136 /* Return whether handle_inferior_event() should proceed through code
1137 starting at PC in function NAME when stepping.
1139 The AIX -bbigtoc linker option generates functions @FIX0, @FIX1, etc. to
1140 handle memory references that are too distant to fit in instructions
1141 generated by the compiler. For example, if 'foo' in the following
1146 is greater than 32767, the linker might replace the lwz with a branch to
1147 somewhere in @FIX1 that does the load in 2 instructions and then branches
1148 back to where execution should continue.
1150 GDB should silently step over @FIX code, just like AIX dbx does.
1151 Unfortunately, the linker uses the "b" instruction for the branches,
1152 meaning that the link register doesn't get set. Therefore, GDB's usual
1153 step_over_function() mechanism won't work.
1155 Instead, use the IN_SOLIB_RETURN_TRAMPOLINE and SKIP_TRAMPOLINE_CODE hooks
1156 in handle_inferior_event() to skip past @FIX code. */
1159 rs6000_in_solib_return_trampoline (CORE_ADDR pc
, char *name
)
1161 return name
&& !strncmp (name
, "@FIX", 4);
1164 /* Skip code that the user doesn't want to see when stepping:
1166 1. Indirect function calls use a piece of trampoline code to do context
1167 switching, i.e. to set the new TOC table. Skip such code if we are on
1168 its first instruction (as when we have single-stepped to here).
1170 2. Skip shared library trampoline code (which is different from
1171 indirect function call trampolines).
1173 3. Skip bigtoc fixup code.
1175 Result is desired PC to step until, or NULL if we are not in
1176 code that should be skipped. */
1179 rs6000_skip_trampoline_code (CORE_ADDR pc
)
1181 register unsigned int ii
, op
;
1183 CORE_ADDR solib_target_pc
;
1184 struct minimal_symbol
*msymbol
;
1186 static unsigned trampoline_code
[] =
1188 0x800b0000, /* l r0,0x0(r11) */
1189 0x90410014, /* st r2,0x14(r1) */
1190 0x7c0903a6, /* mtctr r0 */
1191 0x804b0004, /* l r2,0x4(r11) */
1192 0x816b0008, /* l r11,0x8(r11) */
1193 0x4e800420, /* bctr */
1194 0x4e800020, /* br */
1198 /* Check for bigtoc fixup code. */
1199 msymbol
= lookup_minimal_symbol_by_pc (pc
);
1200 if (msymbol
&& rs6000_in_solib_return_trampoline (pc
, SYMBOL_NAME (msymbol
)))
1202 /* Double-check that the third instruction from PC is relative "b". */
1203 op
= read_memory_integer (pc
+ 8, 4);
1204 if ((op
& 0xfc000003) == 0x48000000)
1206 /* Extract bits 6-29 as a signed 24-bit relative word address and
1207 add it to the containing PC. */
1208 rel
= ((int)(op
<< 6) >> 6);
1209 return pc
+ 8 + rel
;
1213 /* If pc is in a shared library trampoline, return its target. */
1214 solib_target_pc
= find_solib_trampoline_target (pc
);
1215 if (solib_target_pc
)
1216 return solib_target_pc
;
1218 for (ii
= 0; trampoline_code
[ii
]; ++ii
)
1220 op
= read_memory_integer (pc
+ (ii
* 4), 4);
1221 if (op
!= trampoline_code
[ii
])
1224 ii
= read_register (11); /* r11 holds destination addr */
1225 pc
= read_memory_addr (ii
, TDEP
->wordsize
); /* (r11) value */
1229 /* Determines whether the function FI has a frame on the stack or not. */
1232 rs6000_frameless_function_invocation (struct frame_info
*fi
)
1234 CORE_ADDR func_start
;
1235 struct rs6000_framedata fdata
;
1237 /* Don't even think about framelessness except on the innermost frame
1238 or if the function was interrupted by a signal. */
1239 if (fi
->next
!= NULL
&& !fi
->next
->signal_handler_caller
)
1242 func_start
= get_pc_function_start (fi
->pc
);
1244 /* If we failed to find the start of the function, it is a mistake
1245 to inspect the instructions. */
1249 /* A frame with a zero PC is usually created by dereferencing a NULL
1250 function pointer, normally causing an immediate core dump of the
1251 inferior. Mark function as frameless, as the inferior has no chance
1252 of setting up a stack frame. */
1259 (void) skip_prologue (func_start
, fi
->pc
, &fdata
);
1260 return fdata
.frameless
;
1263 /* Return the PC saved in a frame */
1266 rs6000_frame_saved_pc (struct frame_info
*fi
)
1268 CORE_ADDR func_start
;
1269 struct rs6000_framedata fdata
;
1270 int wordsize
= TDEP
->wordsize
;
1272 if (fi
->signal_handler_caller
)
1273 return read_memory_addr (fi
->frame
+ SIG_FRAME_PC_OFFSET
, wordsize
);
1275 if (PC_IN_CALL_DUMMY (fi
->pc
, fi
->frame
, fi
->frame
))
1276 return generic_read_register_dummy (fi
->pc
, fi
->frame
, PC_REGNUM
);
1278 func_start
= get_pc_function_start (fi
->pc
);
1280 /* If we failed to find the start of the function, it is a mistake
1281 to inspect the instructions. */
1285 (void) skip_prologue (func_start
, fi
->pc
, &fdata
);
1287 if (fdata
.lr_offset
== 0 && fi
->next
!= NULL
)
1289 if (fi
->next
->signal_handler_caller
)
1290 return read_memory_addr (fi
->next
->frame
+ SIG_FRAME_LR_OFFSET
,
1293 return read_memory_addr (FRAME_CHAIN (fi
) + DEFAULT_LR_SAVE
,
1297 if (fdata
.lr_offset
== 0)
1298 return read_register (PPC_LR_REGNUM
);
1300 return read_memory_addr (FRAME_CHAIN (fi
) + fdata
.lr_offset
, wordsize
);
1303 /* If saved registers of frame FI are not known yet, read and cache them.
1304 &FDATAP contains rs6000_framedata; TDATAP can be NULL,
1305 in which case the framedata are read. */
1308 frame_get_saved_regs (struct frame_info
*fi
, struct rs6000_framedata
*fdatap
)
1310 CORE_ADDR frame_addr
;
1311 struct rs6000_framedata work_fdata
;
1312 int wordsize
= TDEP
->wordsize
;
1319 fdatap
= &work_fdata
;
1320 (void) skip_prologue (get_pc_function_start (fi
->pc
), fi
->pc
, fdatap
);
1323 frame_saved_regs_zalloc (fi
);
1325 /* If there were any saved registers, figure out parent's stack
1327 /* The following is true only if the frame doesn't have a call to
1330 if (fdatap
->saved_fpr
== 0 && fdatap
->saved_gpr
== 0
1331 && fdatap
->lr_offset
== 0 && fdatap
->cr_offset
== 0)
1333 else if (fi
->prev
&& fi
->prev
->frame
)
1334 frame_addr
= fi
->prev
->frame
;
1336 frame_addr
= read_memory_addr (fi
->frame
, wordsize
);
1338 /* if != -1, fdatap->saved_fpr is the smallest number of saved_fpr.
1339 All fpr's from saved_fpr to fp31 are saved. */
1341 if (fdatap
->saved_fpr
>= 0)
1344 CORE_ADDR fpr_addr
= frame_addr
+ fdatap
->fpr_offset
;
1345 for (i
= fdatap
->saved_fpr
; i
< 32; i
++)
1347 fi
->saved_regs
[FP0_REGNUM
+ i
] = fpr_addr
;
1352 /* if != -1, fdatap->saved_gpr is the smallest number of saved_gpr.
1353 All gpr's from saved_gpr to gpr31 are saved. */
1355 if (fdatap
->saved_gpr
>= 0)
1358 CORE_ADDR gpr_addr
= frame_addr
+ fdatap
->gpr_offset
;
1359 for (i
= fdatap
->saved_gpr
; i
< 32; i
++)
1361 fi
->saved_regs
[i
] = gpr_addr
;
1362 gpr_addr
+= wordsize
;
1366 /* If != 0, fdatap->cr_offset is the offset from the frame that holds
1368 if (fdatap
->cr_offset
!= 0)
1369 fi
->saved_regs
[PPC_CR_REGNUM
] = frame_addr
+ fdatap
->cr_offset
;
1371 /* If != 0, fdatap->lr_offset is the offset from the frame that holds
1373 if (fdatap
->lr_offset
!= 0)
1374 fi
->saved_regs
[PPC_LR_REGNUM
] = frame_addr
+ fdatap
->lr_offset
;
1377 /* Return the address of a frame. This is the inital %sp value when the frame
1378 was first allocated. For functions calling alloca(), it might be saved in
1379 an alloca register. */
1382 frame_initial_stack_address (struct frame_info
*fi
)
1385 struct rs6000_framedata fdata
;
1386 struct frame_info
*callee_fi
;
1388 /* if the initial stack pointer (frame address) of this frame is known,
1391 if (fi
->extra_info
->initial_sp
)
1392 return fi
->extra_info
->initial_sp
;
1394 /* find out if this function is using an alloca register.. */
1396 (void) skip_prologue (get_pc_function_start (fi
->pc
), fi
->pc
, &fdata
);
1398 /* if saved registers of this frame are not known yet, read and cache them. */
1400 if (!fi
->saved_regs
)
1401 frame_get_saved_regs (fi
, &fdata
);
1403 /* If no alloca register used, then fi->frame is the value of the %sp for
1404 this frame, and it is good enough. */
1406 if (fdata
.alloca_reg
< 0)
1408 fi
->extra_info
->initial_sp
= fi
->frame
;
1409 return fi
->extra_info
->initial_sp
;
1412 /* This function has an alloca register. If this is the top-most frame
1413 (with the lowest address), the value in alloca register is good. */
1416 return fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1418 /* Otherwise, this is a caller frame. Callee has usually already saved
1419 registers, but there are exceptions (such as when the callee
1420 has no parameters). Find the address in which caller's alloca
1421 register is saved. */
1423 for (callee_fi
= fi
->next
; callee_fi
; callee_fi
= callee_fi
->next
)
1426 if (!callee_fi
->saved_regs
)
1427 frame_get_saved_regs (callee_fi
, NULL
);
1429 /* this is the address in which alloca register is saved. */
1431 tmpaddr
= callee_fi
->saved_regs
[fdata
.alloca_reg
];
1434 fi
->extra_info
->initial_sp
=
1435 read_memory_addr (tmpaddr
, TDEP
->wordsize
);
1436 return fi
->extra_info
->initial_sp
;
1439 /* Go look into deeper levels of the frame chain to see if any one of
1440 the callees has saved alloca register. */
1443 /* If alloca register was not saved, by the callee (or any of its callees)
1444 then the value in the register is still good. */
1446 fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1447 return fi
->extra_info
->initial_sp
;
1450 /* Describe the pointer in each stack frame to the previous stack frame
1453 /* FRAME_CHAIN takes a frame's nominal address
1454 and produces the frame's chain-pointer. */
1456 /* In the case of the RS/6000, the frame's nominal address
1457 is the address of a 4-byte word containing the calling frame's address. */
1460 rs6000_frame_chain (struct frame_info
*thisframe
)
1462 CORE_ADDR fp
, fpp
, lr
;
1463 int wordsize
= TDEP
->wordsize
;
1465 if (PC_IN_CALL_DUMMY (thisframe
->pc
, thisframe
->frame
, thisframe
->frame
))
1466 return thisframe
->frame
; /* dummy frame same as caller's frame */
1468 if (inside_entry_file (thisframe
->pc
) ||
1469 thisframe
->pc
== entry_point_address ())
1472 if (thisframe
->signal_handler_caller
)
1473 fp
= read_memory_addr (thisframe
->frame
+ SIG_FRAME_FP_OFFSET
,
1475 else if (thisframe
->next
!= NULL
1476 && thisframe
->next
->signal_handler_caller
1477 && FRAMELESS_FUNCTION_INVOCATION (thisframe
))
1478 /* A frameless function interrupted by a signal did not change the
1480 fp
= FRAME_FP (thisframe
);
1482 fp
= read_memory_addr ((thisframe
)->frame
, wordsize
);
1484 lr
= read_register (PPC_LR_REGNUM
);
1485 if (lr
== entry_point_address ())
1486 if (fp
!= 0 && (fpp
= read_memory_addr (fp
, wordsize
)) != 0)
1487 if (PC_IN_CALL_DUMMY (lr
, fpp
, fpp
))
1493 /* Return the size of register REG when words are WORDSIZE bytes long. If REG
1494 isn't available with that word size, return 0. */
1497 regsize (const struct reg
*reg
, int wordsize
)
1499 return wordsize
== 8 ? reg
->sz64
: reg
->sz32
;
1502 /* Return the name of register number N, or null if no such register exists
1503 in the current architecture. */
1506 rs6000_register_name (int n
)
1508 struct gdbarch_tdep
*tdep
= TDEP
;
1509 const struct reg
*reg
= tdep
->regs
+ n
;
1511 if (!regsize (reg
, tdep
->wordsize
))
1516 /* Index within `registers' of the first byte of the space for
1520 rs6000_register_byte (int n
)
1522 return TDEP
->regoff
[n
];
1525 /* Return the number of bytes of storage in the actual machine representation
1526 for register N if that register is available, else return 0. */
1529 rs6000_register_raw_size (int n
)
1531 struct gdbarch_tdep
*tdep
= TDEP
;
1532 const struct reg
*reg
= tdep
->regs
+ n
;
1533 return regsize (reg
, tdep
->wordsize
);
1536 /* Number of bytes of storage in the program's representation
1540 rs6000_register_virtual_size (int n
)
1542 return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (n
));
1545 /* Return the GDB type object for the "standard" data type
1546 of data in register N. */
1548 static struct type
*
1549 rs6000_register_virtual_type (int n
)
1551 struct gdbarch_tdep
*tdep
= TDEP
;
1552 const struct reg
*reg
= tdep
->regs
+ n
;
1554 return reg
->fpr
? builtin_type_double
:
1555 regsize (reg
, tdep
->wordsize
) == 8 ? builtin_type_int64
:
1559 /* For the PowerPC, it appears that the debug info marks float parameters as
1560 floats regardless of whether the function is prototyped, but the actual
1561 values are always passed in as doubles. Tell gdb to always assume that
1562 floats are passed as doubles and then converted in the callee. */
1565 rs6000_coerce_float_to_double (struct type
*formal
, struct type
*actual
)
1570 /* Return whether register N requires conversion when moving from raw format
1573 The register format for RS/6000 floating point registers is always
1574 double, we need a conversion if the memory format is float. */
1577 rs6000_register_convertible (int n
)
1579 const struct reg
*reg
= TDEP
->regs
+ n
;
1583 /* Convert data from raw format for register N in buffer FROM
1584 to virtual format with type TYPE in buffer TO. */
1587 rs6000_register_convert_to_virtual (int n
, struct type
*type
,
1588 char *from
, char *to
)
1590 if (TYPE_LENGTH (type
) != REGISTER_RAW_SIZE (n
))
1592 double val
= extract_floating (from
, REGISTER_RAW_SIZE (n
));
1593 store_floating (to
, TYPE_LENGTH (type
), val
);
1596 memcpy (to
, from
, REGISTER_RAW_SIZE (n
));
1599 /* Convert data from virtual format with type TYPE in buffer FROM
1600 to raw format for register N in buffer TO. */
1603 rs6000_register_convert_to_raw (struct type
*type
, int n
,
1604 char *from
, char *to
)
1606 if (TYPE_LENGTH (type
) != REGISTER_RAW_SIZE (n
))
1608 double val
= extract_floating (from
, TYPE_LENGTH (type
));
1609 store_floating (to
, REGISTER_RAW_SIZE (n
), val
);
1612 memcpy (to
, from
, REGISTER_RAW_SIZE (n
));
1615 /* Store the address of the place in which to copy the structure the
1616 subroutine will return. This is called from call_function.
1618 In RS/6000, struct return addresses are passed as an extra parameter in r3.
1619 In function return, callee is not responsible of returning this address
1620 back. Since gdb needs to find it, we will store in a designated variable
1621 `rs6000_struct_return_address'. */
1624 rs6000_store_struct_return (CORE_ADDR addr
, CORE_ADDR sp
)
1626 write_register (3, addr
);
1627 rs6000_struct_return_address
= addr
;
1630 /* Write into appropriate registers a function return value
1631 of type TYPE, given in virtual format. */
1634 rs6000_store_return_value (struct type
*type
, char *valbuf
)
1636 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
1638 /* Floating point values are returned starting from FPR1 and up.
1639 Say a double_double_double type could be returned in
1640 FPR1/FPR2/FPR3 triple. */
1642 write_register_bytes (REGISTER_BYTE (FP0_REGNUM
+ 1), valbuf
,
1643 TYPE_LENGTH (type
));
1645 /* Everything else is returned in GPR3 and up. */
1646 write_register_bytes (REGISTER_BYTE (PPC_GP0_REGNUM
+ 3), valbuf
,
1647 TYPE_LENGTH (type
));
1650 /* Extract from an array REGBUF containing the (raw) register state
1651 the address in which a function should return its structure value,
1652 as a CORE_ADDR (or an expression that can be used as one). */
1655 rs6000_extract_struct_value_address (char *regbuf
)
1657 return rs6000_struct_return_address
;
1660 /* Return whether PC is in a dummy function call.
1662 FIXME: This just checks for the end of the stack, which is broken
1663 for things like stepping through gcc nested function stubs. */
1666 rs6000_pc_in_call_dummy (CORE_ADDR pc
, CORE_ADDR sp
, CORE_ADDR fp
)
1668 return sp
< pc
&& pc
< fp
;
1671 /* Hook called when a new child process is started. */
1674 rs6000_create_inferior (int pid
)
1676 if (rs6000_set_host_arch_hook
)
1677 rs6000_set_host_arch_hook (pid
);
1680 /* Support for CONVERT_FROM_FUNC_PTR_ADDR(ADDR).
1682 Usually a function pointer's representation is simply the address
1683 of the function. On the RS/6000 however, a function pointer is
1684 represented by a pointer to a TOC entry. This TOC entry contains
1685 three words, the first word is the address of the function, the
1686 second word is the TOC pointer (r2), and the third word is the
1687 static chain value. Throughout GDB it is currently assumed that a
1688 function pointer contains the address of the function, which is not
1689 easy to fix. In addition, the conversion of a function address to
1690 a function pointer would require allocation of a TOC entry in the
1691 inferior's memory space, with all its drawbacks. To be able to
1692 call C++ virtual methods in the inferior (which are called via
1693 function pointers), find_function_addr uses this function to get the
1694 function address from a function pointer. */
1696 /* Return real function address if ADDR (a function pointer) is in the data
1697 space and is therefore a special function pointer. */
1700 rs6000_convert_from_func_ptr_addr (CORE_ADDR addr
)
1702 struct obj_section
*s
;
1704 s
= find_pc_section (addr
);
1705 if (s
&& s
->the_bfd_section
->flags
& SEC_CODE
)
1708 /* ADDR is in the data space, so it's a special function pointer. */
1709 return read_memory_addr (addr
, TDEP
->wordsize
);
1713 /* Handling the various POWER/PowerPC variants. */
1716 /* The arrays here called registers_MUMBLE hold information about available
1719 For each family of PPC variants, I've tried to isolate out the
1720 common registers and put them up front, so that as long as you get
1721 the general family right, GDB will correctly identify the registers
1722 common to that family. The common register sets are:
1724 For the 60x family: hid0 hid1 iabr dabr pir
1726 For the 505 and 860 family: eie eid nri
1728 For the 403 and 403GC: icdbdr esr dear evpr cdbcr tsr tcr pit tbhi
1729 tblo srr2 srr3 dbsr dbcr iac1 iac2 dac1 dac2 dccr iccr pbl1
1732 Most of these register groups aren't anything formal. I arrived at
1733 them by looking at the registers that occurred in more than one
1736 /* Convenience macros for populating register arrays. */
1738 /* Within another macro, convert S to a string. */
1742 /* Return a struct reg defining register NAME that's 32 bits on 32-bit systems
1743 and 64 bits on 64-bit systems. */
1744 #define R(name) { STR(name), 4, 8, 0 }
1746 /* Return a struct reg defining register NAME that's 32 bits on all
1748 #define R4(name) { STR(name), 4, 4, 0 }
1750 /* Return a struct reg defining register NAME that's 64 bits on all
1752 #define R8(name) { STR(name), 8, 8, 0 }
1754 /* Return a struct reg defining floating-point register NAME. */
1755 #define F(name) { STR(name), 8, 8, 1 }
1757 /* Return a struct reg defining register NAME that's 32 bits on 32-bit
1758 systems and that doesn't exist on 64-bit systems. */
1759 #define R32(name) { STR(name), 4, 0, 0 }
1761 /* Return a struct reg defining register NAME that's 64 bits on 64-bit
1762 systems and that doesn't exist on 32-bit systems. */
1763 #define R64(name) { STR(name), 0, 8, 0 }
1765 /* Return a struct reg placeholder for a register that doesn't exist. */
1766 #define R0 { 0, 0, 0, 0 }
1768 /* UISA registers common across all architectures, including POWER. */
1770 #define COMMON_UISA_REGS \
1771 /* 0 */ R(r0), R(r1), R(r2), R(r3), R(r4), R(r5), R(r6), R(r7), \
1772 /* 8 */ R(r8), R(r9), R(r10),R(r11),R(r12),R(r13),R(r14),R(r15), \
1773 /* 16 */ R(r16),R(r17),R(r18),R(r19),R(r20),R(r21),R(r22),R(r23), \
1774 /* 24 */ R(r24),R(r25),R(r26),R(r27),R(r28),R(r29),R(r30),R(r31), \
1775 /* 32 */ F(f0), F(f1), F(f2), F(f3), F(f4), F(f5), F(f6), F(f7), \
1776 /* 40 */ F(f8), F(f9), F(f10),F(f11),F(f12),F(f13),F(f14),F(f15), \
1777 /* 48 */ F(f16),F(f17),F(f18),F(f19),F(f20),F(f21),F(f22),F(f23), \
1778 /* 56 */ F(f24),F(f25),F(f26),F(f27),F(f28),F(f29),F(f30),F(f31), \
1779 /* 64 */ R(pc), R(ps)
1781 /* UISA-level SPRs for PowerPC. */
1782 #define PPC_UISA_SPRS \
1783 /* 66 */ R4(cr), R(lr), R(ctr), R4(xer), R0
1785 /* Segment registers, for PowerPC. */
1786 #define PPC_SEGMENT_REGS \
1787 /* 71 */ R32(sr0), R32(sr1), R32(sr2), R32(sr3), \
1788 /* 75 */ R32(sr4), R32(sr5), R32(sr6), R32(sr7), \
1789 /* 79 */ R32(sr8), R32(sr9), R32(sr10), R32(sr11), \
1790 /* 83 */ R32(sr12), R32(sr13), R32(sr14), R32(sr15)
1792 /* OEA SPRs for PowerPC. */
1793 #define PPC_OEA_SPRS \
1795 /* 88 */ R(ibat0u), R(ibat0l), R(ibat1u), R(ibat1l), \
1796 /* 92 */ R(ibat2u), R(ibat2l), R(ibat3u), R(ibat3l), \
1797 /* 96 */ R(dbat0u), R(dbat0l), R(dbat1u), R(dbat1l), \
1798 /* 100 */ R(dbat2u), R(dbat2l), R(dbat3u), R(dbat3l), \
1799 /* 104 */ R(sdr1), R64(asr), R(dar), R4(dsisr), \
1800 /* 108 */ R(sprg0), R(sprg1), R(sprg2), R(sprg3), \
1801 /* 112 */ R(srr0), R(srr1), R(tbl), R(tbu), \
1802 /* 116 */ R4(dec), R(dabr), R4(ear)
1804 /* IBM POWER (pre-PowerPC) architecture, user-level view. We only cover
1805 user-level SPR's. */
1806 static const struct reg registers_power
[] =
1809 /* 66 */ R4(cnd
), R(lr
), R(cnt
), R4(xer
), R4(mq
)
1812 /* PowerPC UISA - a PPC processor as viewed by user-level code. A UISA-only
1813 view of the PowerPC. */
1814 static const struct reg registers_powerpc
[] =
1820 /* IBM PowerPC 403. */
1821 static const struct reg registers_403
[] =
1827 /* 119 */ R(icdbdr
), R(esr
), R(dear
), R(evpr
),
1828 /* 123 */ R(cdbcr
), R(tsr
), R(tcr
), R(pit
),
1829 /* 127 */ R(tbhi
), R(tblo
), R(srr2
), R(srr3
),
1830 /* 131 */ R(dbsr
), R(dbcr
), R(iac1
), R(iac2
),
1831 /* 135 */ R(dac1
), R(dac2
), R(dccr
), R(iccr
),
1832 /* 139 */ R(pbl1
), R(pbu1
), R(pbl2
), R(pbu2
)
1835 /* IBM PowerPC 403GC. */
1836 static const struct reg registers_403GC
[] =
1842 /* 119 */ R(icdbdr
), R(esr
), R(dear
), R(evpr
),
1843 /* 123 */ R(cdbcr
), R(tsr
), R(tcr
), R(pit
),
1844 /* 127 */ R(tbhi
), R(tblo
), R(srr2
), R(srr3
),
1845 /* 131 */ R(dbsr
), R(dbcr
), R(iac1
), R(iac2
),
1846 /* 135 */ R(dac1
), R(dac2
), R(dccr
), R(iccr
),
1847 /* 139 */ R(pbl1
), R(pbu1
), R(pbl2
), R(pbu2
),
1848 /* 143 */ R(zpr
), R(pid
), R(sgr
), R(dcwr
),
1849 /* 147 */ R(tbhu
), R(tblu
)
1852 /* Motorola PowerPC 505. */
1853 static const struct reg registers_505
[] =
1859 /* 119 */ R(eie
), R(eid
), R(nri
)
1862 /* Motorola PowerPC 860 or 850. */
1863 static const struct reg registers_860
[] =
1869 /* 119 */ R(eie
), R(eid
), R(nri
), R(cmpa
),
1870 /* 123 */ R(cmpb
), R(cmpc
), R(cmpd
), R(icr
),
1871 /* 127 */ R(der
), R(counta
), R(countb
), R(cmpe
),
1872 /* 131 */ R(cmpf
), R(cmpg
), R(cmph
), R(lctrl1
),
1873 /* 135 */ R(lctrl2
), R(ictrl
), R(bar
), R(ic_cst
),
1874 /* 139 */ R(ic_adr
), R(ic_dat
), R(dc_cst
), R(dc_adr
),
1875 /* 143 */ R(dc_dat
), R(dpdr
), R(dpir
), R(immr
),
1876 /* 147 */ R(mi_ctr
), R(mi_ap
), R(mi_epn
), R(mi_twc
),
1877 /* 151 */ R(mi_rpn
), R(md_ctr
), R(m_casid
), R(md_ap
),
1878 /* 155 */ R(md_epn
), R(md_twb
), R(md_twc
), R(md_rpn
),
1879 /* 159 */ R(m_tw
), R(mi_dbcam
), R(mi_dbram0
), R(mi_dbram1
),
1880 /* 163 */ R(md_dbcam
), R(md_dbram0
), R(md_dbram1
)
1883 /* Motorola PowerPC 601. Note that the 601 has different register numbers
1884 for reading and writing RTCU and RTCL. However, how one reads and writes a
1885 register is the stub's problem. */
1886 static const struct reg registers_601
[] =
1892 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1893 /* 123 */ R(pir
), R(mq
), R(rtcu
), R(rtcl
)
1896 /* Motorola PowerPC 602. */
1897 static const struct reg registers_602
[] =
1903 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R0
,
1904 /* 123 */ R0
, R(tcr
), R(ibr
), R(esassr
),
1905 /* 127 */ R(sebr
), R(ser
), R(sp
), R(lt
)
1908 /* Motorola/IBM PowerPC 603 or 603e. */
1909 static const struct reg registers_603
[] =
1915 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R0
,
1916 /* 123 */ R0
, R(dmiss
), R(dcmp
), R(hash1
),
1917 /* 127 */ R(hash2
), R(imiss
), R(icmp
), R(rpa
)
1920 /* Motorola PowerPC 604 or 604e. */
1921 static const struct reg registers_604
[] =
1927 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1928 /* 123 */ R(pir
), R(mmcr0
), R(pmc1
), R(pmc2
),
1929 /* 127 */ R(sia
), R(sda
)
1932 /* Motorola/IBM PowerPC 750 or 740. */
1933 static const struct reg registers_750
[] =
1939 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1940 /* 123 */ R0
, R(ummcr0
), R(upmc1
), R(upmc2
),
1941 /* 127 */ R(usia
), R(ummcr1
), R(upmc3
), R(upmc4
),
1942 /* 131 */ R(mmcr0
), R(pmc1
), R(pmc2
), R(sia
),
1943 /* 135 */ R(mmcr1
), R(pmc3
), R(pmc4
), R(l2cr
),
1944 /* 139 */ R(ictc
), R(thrm1
), R(thrm2
), R(thrm3
)
1948 /* Information about a particular processor variant. */
1952 /* Name of this variant. */
1955 /* English description of the variant. */
1958 /* bfd_arch_info.arch corresponding to variant. */
1959 enum bfd_architecture arch
;
1961 /* bfd_arch_info.mach corresponding to variant. */
1964 /* Table of register names; registers[R] is the name of the register
1967 const struct reg
*regs
;
1970 #define num_registers(list) (sizeof (list) / sizeof((list)[0]))
1973 /* Information in this table comes from the following web sites:
1974 IBM: http://www.chips.ibm.com:80/products/embedded/
1975 Motorola: http://www.mot.com/SPS/PowerPC/
1977 I'm sure I've got some of the variant descriptions not quite right.
1978 Please report any inaccuracies you find to GDB's maintainer.
1980 If you add entries to this table, please be sure to allow the new
1981 value as an argument to the --with-cpu flag, in configure.in. */
1983 static const struct variant variants
[] =
1985 {"powerpc", "PowerPC user-level", bfd_arch_powerpc
,
1986 bfd_mach_ppc
, num_registers (registers_powerpc
), registers_powerpc
},
1987 {"power", "POWER user-level", bfd_arch_rs6000
,
1988 bfd_mach_rs6k
, num_registers (registers_power
), registers_power
},
1989 {"403", "IBM PowerPC 403", bfd_arch_powerpc
,
1990 bfd_mach_ppc_403
, num_registers (registers_403
), registers_403
},
1991 {"601", "Motorola PowerPC 601", bfd_arch_powerpc
,
1992 bfd_mach_ppc_601
, num_registers (registers_601
), registers_601
},
1993 {"602", "Motorola PowerPC 602", bfd_arch_powerpc
,
1994 bfd_mach_ppc_602
, num_registers (registers_602
), registers_602
},
1995 {"603", "Motorola/IBM PowerPC 603 or 603e", bfd_arch_powerpc
,
1996 bfd_mach_ppc_603
, num_registers (registers_603
), registers_603
},
1997 {"604", "Motorola PowerPC 604 or 604e", bfd_arch_powerpc
,
1998 604, num_registers (registers_604
), registers_604
},
1999 {"403GC", "IBM PowerPC 403GC", bfd_arch_powerpc
,
2000 bfd_mach_ppc_403gc
, num_registers (registers_403GC
), registers_403GC
},
2001 {"505", "Motorola PowerPC 505", bfd_arch_powerpc
,
2002 bfd_mach_ppc_505
, num_registers (registers_505
), registers_505
},
2003 {"860", "Motorola PowerPC 860 or 850", bfd_arch_powerpc
,
2004 bfd_mach_ppc_860
, num_registers (registers_860
), registers_860
},
2005 {"750", "Motorola/IBM PowerPC 750 or 740", bfd_arch_powerpc
,
2006 bfd_mach_ppc_750
, num_registers (registers_750
), registers_750
},
2008 /* FIXME: I haven't checked the register sets of the following. */
2009 {"620", "Motorola PowerPC 620", bfd_arch_powerpc
,
2010 bfd_mach_ppc_620
, num_registers (registers_powerpc
), registers_powerpc
},
2011 {"a35", "PowerPC A35", bfd_arch_powerpc
,
2012 bfd_mach_ppc_a35
, num_registers (registers_powerpc
), registers_powerpc
},
2013 {"rs1", "IBM POWER RS1", bfd_arch_rs6000
,
2014 bfd_mach_rs6k_rs1
, num_registers (registers_power
), registers_power
},
2015 {"rsc", "IBM POWER RSC", bfd_arch_rs6000
,
2016 bfd_mach_rs6k_rsc
, num_registers (registers_power
), registers_power
},
2017 {"rs2", "IBM POWER RS2", bfd_arch_rs6000
,
2018 bfd_mach_rs6k_rs2
, num_registers (registers_power
), registers_power
},
2023 #undef num_registers
2025 /* Look up the variant named NAME in the `variants' table. Return a
2026 pointer to the struct variant, or null if we couldn't find it. */
2028 static const struct variant
*
2029 find_variant_by_name (char *name
)
2031 const struct variant
*v
;
2033 for (v
= variants
; v
->name
; v
++)
2034 if (!strcmp (name
, v
->name
))
2040 /* Return the variant corresponding to architecture ARCH and machine number
2041 MACH. If no such variant exists, return null. */
2043 static const struct variant
*
2044 find_variant_by_arch (enum bfd_architecture arch
, unsigned long mach
)
2046 const struct variant
*v
;
2048 for (v
= variants
; v
->name
; v
++)
2049 if (arch
== v
->arch
&& mach
== v
->mach
)
2059 process_note_abi_tag_sections (bfd
*abfd
, asection
*sect
, void *obj
)
2061 int *os_ident_ptr
= obj
;
2063 unsigned int sectsize
;
2065 name
= bfd_get_section_name (abfd
, sect
);
2066 sectsize
= bfd_section_size (abfd
, sect
);
2067 if (strcmp (name
, ".note.ABI-tag") == 0 && sectsize
> 0)
2069 unsigned int name_length
, data_length
, note_type
;
2070 char *note
= alloca (sectsize
);
2072 bfd_get_section_contents (abfd
, sect
, note
,
2073 (file_ptr
) 0, (bfd_size_type
) sectsize
);
2075 name_length
= bfd_h_get_32 (abfd
, note
);
2076 data_length
= bfd_h_get_32 (abfd
, note
+ 4);
2077 note_type
= bfd_h_get_32 (abfd
, note
+ 8);
2079 if (name_length
== 4 && data_length
== 16 && note_type
== 1
2080 && strcmp (note
+ 12, "GNU") == 0)
2082 int os_number
= bfd_h_get_32 (abfd
, note
+ 16);
2084 /* The case numbers are from abi-tags in glibc */
2088 *os_ident_ptr
= ELFOSABI_LINUX
;
2091 *os_ident_ptr
= ELFOSABI_HURD
;
2094 *os_ident_ptr
= ELFOSABI_SOLARIS
;
2097 internal_error (__FILE__
, __LINE__
,
2098 "process_note_abi_sections: unknown OS number %d",
2106 /* Return one of the ELFOSABI_ constants for BFDs representing ELF
2107 executables. If it's not an ELF executable or if the OS/ABI couldn't
2108 be determined, simply return -1. */
2111 get_elfosabi (bfd
*abfd
)
2115 if (abfd
!= NULL
&& bfd_get_flavour (abfd
) == bfd_target_elf_flavour
)
2117 elfosabi
= elf_elfheader (abfd
)->e_ident
[EI_OSABI
];
2119 /* When elfosabi is 0 (ELFOSABI_NONE), this is supposed to indicate
2120 that we're on a SYSV system. However, GNU/Linux uses a note section
2121 to record OS/ABI info, but leaves e_ident[EI_OSABI] zero. So we
2122 have to check the note sections too. */
2125 bfd_map_over_sections (abfd
,
2126 process_note_abi_tag_sections
,
2136 /* Initialize the current architecture based on INFO. If possible, re-use an
2137 architecture from ARCHES, which is a list of architectures already created
2138 during this debugging session.
2140 Called e.g. at program startup, when reading a core file, and when reading
2143 static struct gdbarch
*
2144 rs6000_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
2146 struct gdbarch
*gdbarch
;
2147 struct gdbarch_tdep
*tdep
;
2148 int wordsize
, from_xcoff_exec
, from_elf_exec
, power
, i
, off
;
2150 const struct variant
*v
;
2151 enum bfd_architecture arch
;
2154 int osabi
, sysv_abi
;
2156 from_xcoff_exec
= info
.abfd
&& info
.abfd
->format
== bfd_object
&&
2157 bfd_get_flavour (info
.abfd
) == bfd_target_xcoff_flavour
;
2159 from_elf_exec
= info
.abfd
&& info
.abfd
->format
== bfd_object
&&
2160 bfd_get_flavour (info
.abfd
) == bfd_target_elf_flavour
;
2162 sysv_abi
= info
.abfd
&& bfd_get_flavour (info
.abfd
) == bfd_target_elf_flavour
;
2164 osabi
= get_elfosabi (info
.abfd
);
2166 /* Check word size. If INFO is from a binary file, infer it from
2167 that, else choose a likely default. */
2168 if (from_xcoff_exec
)
2170 if (xcoff_data (info
.abfd
)->xcoff64
)
2175 else if (from_elf_exec
)
2177 if (elf_elfheader (info
.abfd
)->e_ident
[EI_CLASS
] == ELFCLASS64
)
2187 /* Find a candidate among extant architectures. */
2188 for (arches
= gdbarch_list_lookup_by_info (arches
, &info
);
2190 arches
= gdbarch_list_lookup_by_info (arches
->next
, &info
))
2192 /* Word size in the various PowerPC bfd_arch_info structs isn't
2193 meaningful, because 64-bit CPUs can run in 32-bit mode. So, perform
2194 separate word size check. */
2195 tdep
= gdbarch_tdep (arches
->gdbarch
);
2196 if (tdep
&& tdep
->wordsize
== wordsize
&& tdep
->osabi
== osabi
)
2197 return arches
->gdbarch
;
2200 /* None found, create a new architecture from INFO, whose bfd_arch_info
2201 validity depends on the source:
2202 - executable useless
2203 - rs6000_host_arch() good
2205 - "set arch" trust blindly
2206 - GDB startup useless but harmless */
2208 if (!from_xcoff_exec
)
2210 arch
= info
.bfd_arch_info
->arch
;
2211 mach
= info
.bfd_arch_info
->mach
;
2215 arch
= bfd_arch_powerpc
;
2217 bfd_default_set_arch_mach (&abfd
, arch
, mach
);
2218 info
.bfd_arch_info
= bfd_get_arch_info (&abfd
);
2220 tdep
= xmalloc (sizeof (struct gdbarch_tdep
));
2221 tdep
->wordsize
= wordsize
;
2222 tdep
->osabi
= osabi
;
2223 gdbarch
= gdbarch_alloc (&info
, tdep
);
2224 power
= arch
== bfd_arch_rs6000
;
2226 /* Select instruction printer. */
2227 tm_print_insn
= arch
== power
? print_insn_rs6000
:
2228 info
.byte_order
== BIG_ENDIAN
? print_insn_big_powerpc
:
2229 print_insn_little_powerpc
;
2231 /* Choose variant. */
2232 v
= find_variant_by_arch (arch
, mach
);
2234 v
= find_variant_by_name (power
? "power" : "powerpc");
2235 tdep
->regs
= v
->regs
;
2237 /* Calculate byte offsets in raw register array. */
2238 tdep
->regoff
= xmalloc (v
->nregs
* sizeof (int));
2239 for (i
= off
= 0; i
< v
->nregs
; i
++)
2241 tdep
->regoff
[i
] = off
;
2242 off
+= regsize (v
->regs
+ i
, wordsize
);
2245 set_gdbarch_read_pc (gdbarch
, generic_target_read_pc
);
2246 set_gdbarch_write_pc (gdbarch
, generic_target_write_pc
);
2247 set_gdbarch_read_fp (gdbarch
, generic_target_read_fp
);
2248 set_gdbarch_write_fp (gdbarch
, generic_target_write_fp
);
2249 set_gdbarch_read_sp (gdbarch
, generic_target_read_sp
);
2250 set_gdbarch_write_sp (gdbarch
, generic_target_write_sp
);
2252 set_gdbarch_num_regs (gdbarch
, v
->nregs
);
2253 set_gdbarch_sp_regnum (gdbarch
, 1);
2254 set_gdbarch_fp_regnum (gdbarch
, 1);
2255 set_gdbarch_pc_regnum (gdbarch
, 64);
2256 set_gdbarch_register_name (gdbarch
, rs6000_register_name
);
2257 set_gdbarch_register_size (gdbarch
, wordsize
);
2258 set_gdbarch_register_bytes (gdbarch
, off
);
2259 set_gdbarch_register_byte (gdbarch
, rs6000_register_byte
);
2260 set_gdbarch_register_raw_size (gdbarch
, rs6000_register_raw_size
);
2261 set_gdbarch_max_register_raw_size (gdbarch
, 8);
2262 set_gdbarch_register_virtual_size (gdbarch
, rs6000_register_virtual_size
);
2263 set_gdbarch_max_register_virtual_size (gdbarch
, 8);
2264 set_gdbarch_register_virtual_type (gdbarch
, rs6000_register_virtual_type
);
2266 set_gdbarch_ptr_bit (gdbarch
, wordsize
* TARGET_CHAR_BIT
);
2267 set_gdbarch_short_bit (gdbarch
, 2 * TARGET_CHAR_BIT
);
2268 set_gdbarch_int_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
2269 set_gdbarch_long_bit (gdbarch
, wordsize
* TARGET_CHAR_BIT
);
2270 set_gdbarch_long_long_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2271 set_gdbarch_float_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
2272 set_gdbarch_double_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2273 set_gdbarch_long_double_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2275 set_gdbarch_use_generic_dummy_frames (gdbarch
, 1);
2276 set_gdbarch_call_dummy_length (gdbarch
, 0);
2277 set_gdbarch_call_dummy_location (gdbarch
, AT_ENTRY_POINT
);
2278 set_gdbarch_call_dummy_address (gdbarch
, entry_point_address
);
2279 set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch
, 1);
2280 set_gdbarch_call_dummy_breakpoint_offset (gdbarch
, 0);
2281 set_gdbarch_call_dummy_start_offset (gdbarch
, 0);
2282 set_gdbarch_pc_in_call_dummy (gdbarch
, generic_pc_in_call_dummy
);
2283 set_gdbarch_call_dummy_p (gdbarch
, 1);
2284 set_gdbarch_call_dummy_stack_adjust_p (gdbarch
, 0);
2285 set_gdbarch_get_saved_register (gdbarch
, generic_get_saved_register
);
2286 set_gdbarch_fix_call_dummy (gdbarch
, rs6000_fix_call_dummy
);
2287 set_gdbarch_push_dummy_frame (gdbarch
, generic_push_dummy_frame
);
2288 set_gdbarch_save_dummy_frame_tos (gdbarch
, generic_save_dummy_frame_tos
);
2289 set_gdbarch_push_return_address (gdbarch
, ppc_push_return_address
);
2290 set_gdbarch_believe_pcc_promotion (gdbarch
, 1);
2291 set_gdbarch_coerce_float_to_double (gdbarch
, rs6000_coerce_float_to_double
);
2293 set_gdbarch_register_convertible (gdbarch
, rs6000_register_convertible
);
2294 set_gdbarch_register_convert_to_virtual (gdbarch
, rs6000_register_convert_to_virtual
);
2295 set_gdbarch_register_convert_to_raw (gdbarch
, rs6000_register_convert_to_raw
);
2297 set_gdbarch_extract_return_value (gdbarch
, rs6000_extract_return_value
);
2300 set_gdbarch_push_arguments (gdbarch
, ppc_sysv_abi_push_arguments
);
2302 set_gdbarch_push_arguments (gdbarch
, rs6000_push_arguments
);
2304 set_gdbarch_store_struct_return (gdbarch
, rs6000_store_struct_return
);
2305 set_gdbarch_store_return_value (gdbarch
, rs6000_store_return_value
);
2306 set_gdbarch_extract_struct_value_address (gdbarch
, rs6000_extract_struct_value_address
);
2307 set_gdbarch_use_struct_convention (gdbarch
, generic_use_struct_convention
);
2309 set_gdbarch_pop_frame (gdbarch
, rs6000_pop_frame
);
2311 set_gdbarch_skip_prologue (gdbarch
, rs6000_skip_prologue
);
2312 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
2313 set_gdbarch_decr_pc_after_break (gdbarch
, 0);
2314 set_gdbarch_function_start_offset (gdbarch
, 0);
2315 set_gdbarch_breakpoint_from_pc (gdbarch
, rs6000_breakpoint_from_pc
);
2317 /* Not sure on this. FIXMEmgo */
2318 set_gdbarch_frame_args_skip (gdbarch
, 8);
2320 set_gdbarch_frame_chain_valid (gdbarch
, file_frame_chain_valid
);
2321 if (osabi
== ELFOSABI_LINUX
)
2323 set_gdbarch_frameless_function_invocation (gdbarch
,
2324 ppc_linux_frameless_function_invocation
);
2325 set_gdbarch_frame_chain (gdbarch
, ppc_linux_frame_chain
);
2326 set_gdbarch_frame_saved_pc (gdbarch
, ppc_linux_frame_saved_pc
);
2328 set_gdbarch_frame_init_saved_regs (gdbarch
,
2329 ppc_linux_frame_init_saved_regs
);
2330 set_gdbarch_init_extra_frame_info (gdbarch
,
2331 ppc_linux_init_extra_frame_info
);
2333 set_gdbarch_memory_remove_breakpoint (gdbarch
,
2334 ppc_linux_memory_remove_breakpoint
);
2338 set_gdbarch_frameless_function_invocation (gdbarch
,
2339 rs6000_frameless_function_invocation
);
2340 set_gdbarch_frame_chain (gdbarch
, rs6000_frame_chain
);
2341 set_gdbarch_frame_saved_pc (gdbarch
, rs6000_frame_saved_pc
);
2343 set_gdbarch_frame_init_saved_regs (gdbarch
, rs6000_frame_init_saved_regs
);
2344 set_gdbarch_init_extra_frame_info (gdbarch
, rs6000_init_extra_frame_info
);
2346 /* Handle RS/6000 function pointers. */
2347 set_gdbarch_convert_from_func_ptr_addr (gdbarch
,
2348 rs6000_convert_from_func_ptr_addr
);
2350 set_gdbarch_frame_args_address (gdbarch
, rs6000_frame_args_address
);
2351 set_gdbarch_frame_locals_address (gdbarch
, rs6000_frame_args_address
);
2352 set_gdbarch_saved_pc_after_call (gdbarch
, rs6000_saved_pc_after_call
);
2354 /* We can't tell how many args there are
2355 now that the C compiler delays popping them. */
2356 set_gdbarch_frame_num_args (gdbarch
, frame_num_args_unknown
);
2361 /* Initialization code. */
2364 _initialize_rs6000_tdep (void)
2366 register_gdbarch_init (bfd_arch_rs6000
, rs6000_gdbarch_init
);
2367 register_gdbarch_init (bfd_arch_powerpc
, rs6000_gdbarch_init
);