1 /* Target-dependent code for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
31 #include "arch-utils.h"
33 #include "bfd/libbfd.h" /* for bfd_default_set_arch_mach */
34 #include "coff/internal.h" /* for libcoff.h */
35 #include "bfd/libcoff.h" /* for xcoff_data */
41 /* If the kernel has to deliver a signal, it pushes a sigcontext
42 structure on the stack and then calls the signal handler, passing
43 the address of the sigcontext in an argument register. Usually
44 the signal handler doesn't save this register, so we have to
45 access the sigcontext structure via an offset from the signal handler
47 The following constants were determined by experimentation on AIX 3.2. */
48 #define SIG_FRAME_PC_OFFSET 96
49 #define SIG_FRAME_LR_OFFSET 108
50 #define SIG_FRAME_FP_OFFSET 284
52 /* To be used by skip_prologue. */
54 struct rs6000_framedata
56 int offset
; /* total size of frame --- the distance
57 by which we decrement sp to allocate
59 int saved_gpr
; /* smallest # of saved gpr */
60 int saved_fpr
; /* smallest # of saved fpr */
61 int alloca_reg
; /* alloca register number (frame ptr) */
62 char frameless
; /* true if frameless functions. */
63 char nosavedpc
; /* true if pc not saved. */
64 int gpr_offset
; /* offset of saved gprs from prev sp */
65 int fpr_offset
; /* offset of saved fprs from prev sp */
66 int lr_offset
; /* offset of saved lr */
67 int cr_offset
; /* offset of saved cr */
70 /* Description of a single register. */
74 char *name
; /* name of register */
75 unsigned char sz32
; /* size on 32-bit arch, 0 if nonextant */
76 unsigned char sz64
; /* size on 64-bit arch, 0 if nonextant */
77 unsigned char fpr
; /* whether register is floating-point */
80 /* Private data that this module attaches to struct gdbarch. */
84 int wordsize
; /* size in bytes of fixed-point word */
85 int osabi
; /* OS / ABI from ELF header */
86 int *regoff
; /* byte offsets in register arrays */
87 const struct reg
*regs
; /* from current variant */
90 /* Return the current architecture's gdbarch_tdep structure. */
92 #define TDEP gdbarch_tdep (current_gdbarch)
94 /* Breakpoint shadows for the single step instructions will be kept here. */
96 static struct sstep_breaks
98 /* Address, or 0 if this is not in use. */
100 /* Shadow contents. */
105 /* Hook for determining the TOC address when calling functions in the
106 inferior under AIX. The initialization code in rs6000-nat.c sets
107 this hook to point to find_toc_address. */
109 CORE_ADDR (*rs6000_find_toc_address_hook
) (CORE_ADDR
) = NULL
;
111 /* Hook to set the current architecture when starting a child process.
112 rs6000-nat.c sets this. */
114 void (*rs6000_set_host_arch_hook
) (int) = NULL
;
116 /* Static function prototypes */
118 static CORE_ADDR
branch_dest (int opcode
, int instr
, CORE_ADDR pc
,
120 static CORE_ADDR
skip_prologue (CORE_ADDR
, CORE_ADDR
,
121 struct rs6000_framedata
*);
122 static void frame_get_saved_regs (struct frame_info
* fi
,
123 struct rs6000_framedata
* fdatap
);
124 static CORE_ADDR
frame_initial_stack_address (struct frame_info
*);
126 /* Read a LEN-byte address from debugged memory address MEMADDR. */
129 read_memory_addr (CORE_ADDR memaddr
, int len
)
131 return read_memory_unsigned_integer (memaddr
, len
);
135 rs6000_skip_prologue (CORE_ADDR pc
)
137 struct rs6000_framedata frame
;
138 pc
= skip_prologue (pc
, 0, &frame
);
143 /* Fill in fi->saved_regs */
145 struct frame_extra_info
147 /* Functions calling alloca() change the value of the stack
148 pointer. We need to use initial stack pointer (which is saved in
149 r31 by gcc) in such cases. If a compiler emits traceback table,
150 then we should use the alloca register specified in traceback
152 CORE_ADDR initial_sp
; /* initial stack pointer. */
156 rs6000_init_extra_frame_info (int fromleaf
, struct frame_info
*fi
)
158 fi
->extra_info
= (struct frame_extra_info
*)
159 frame_obstack_alloc (sizeof (struct frame_extra_info
));
160 fi
->extra_info
->initial_sp
= 0;
161 if (fi
->next
!= (CORE_ADDR
) 0
162 && fi
->pc
< TEXT_SEGMENT_BASE
)
163 /* We're in get_prev_frame */
164 /* and this is a special signal frame. */
165 /* (fi->pc will be some low address in the kernel, */
166 /* to which the signal handler returns). */
167 fi
->signal_handler_caller
= 1;
170 /* Put here the code to store, into a struct frame_saved_regs,
171 the addresses of the saved registers of frame described by FRAME_INFO.
172 This includes special registers such as pc and fp saved in special
173 ways in the stack frame. sp is even more special:
174 the address we return for it IS the sp for the next frame. */
176 /* In this implementation for RS/6000, we do *not* save sp. I am
177 not sure if it will be needed. The following function takes care of gpr's
181 rs6000_frame_init_saved_regs (struct frame_info
*fi
)
183 frame_get_saved_regs (fi
, NULL
);
187 rs6000_frame_args_address (struct frame_info
*fi
)
189 if (fi
->extra_info
->initial_sp
!= 0)
190 return fi
->extra_info
->initial_sp
;
192 return frame_initial_stack_address (fi
);
195 /* Immediately after a function call, return the saved pc.
196 Can't go through the frames for this because on some machines
197 the new frame is not set up until the new function executes
198 some instructions. */
201 rs6000_saved_pc_after_call (struct frame_info
*fi
)
203 return read_register (PPC_LR_REGNUM
);
206 /* Calculate the destination of a branch/jump. Return -1 if not a branch. */
209 branch_dest (int opcode
, int instr
, CORE_ADDR pc
, CORE_ADDR safety
)
216 absolute
= (int) ((instr
>> 1) & 1);
221 immediate
= ((instr
& ~3) << 6) >> 6; /* br unconditional */
225 dest
= pc
+ immediate
;
229 immediate
= ((instr
& ~3) << 16) >> 16; /* br conditional */
233 dest
= pc
+ immediate
;
237 ext_op
= (instr
>> 1) & 0x3ff;
239 if (ext_op
== 16) /* br conditional register */
241 dest
= read_register (PPC_LR_REGNUM
) & ~3;
243 /* If we are about to return from a signal handler, dest is
244 something like 0x3c90. The current frame is a signal handler
245 caller frame, upon completion of the sigreturn system call
246 execution will return to the saved PC in the frame. */
247 if (dest
< TEXT_SEGMENT_BASE
)
249 struct frame_info
*fi
;
251 fi
= get_current_frame ();
253 dest
= read_memory_addr (fi
->frame
+ SIG_FRAME_PC_OFFSET
,
258 else if (ext_op
== 528) /* br cond to count reg */
260 dest
= read_register (PPC_CTR_REGNUM
) & ~3;
262 /* If we are about to execute a system call, dest is something
263 like 0x22fc or 0x3b00. Upon completion the system call
264 will return to the address in the link register. */
265 if (dest
< TEXT_SEGMENT_BASE
)
266 dest
= read_register (PPC_LR_REGNUM
) & ~3;
275 return (dest
< TEXT_SEGMENT_BASE
) ? safety
: dest
;
279 /* Sequence of bytes for breakpoint instruction. */
281 #define BIG_BREAKPOINT { 0x7d, 0x82, 0x10, 0x08 }
282 #define LITTLE_BREAKPOINT { 0x08, 0x10, 0x82, 0x7d }
284 static unsigned char *
285 rs6000_breakpoint_from_pc (CORE_ADDR
*bp_addr
, int *bp_size
)
287 static unsigned char big_breakpoint
[] = BIG_BREAKPOINT
;
288 static unsigned char little_breakpoint
[] = LITTLE_BREAKPOINT
;
290 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
)
291 return big_breakpoint
;
293 return little_breakpoint
;
297 /* AIX does not support PT_STEP. Simulate it. */
300 rs6000_software_single_step (unsigned int signal
, int insert_breakpoints_p
)
302 #define INSNLEN(OPCODE) 4
304 static char le_breakp
[] = LITTLE_BREAKPOINT
;
305 static char be_breakp
[] = BIG_BREAKPOINT
;
306 char *breakp
= TARGET_BYTE_ORDER
== BIG_ENDIAN
? be_breakp
: le_breakp
;
312 if (insert_breakpoints_p
)
317 insn
= read_memory_integer (loc
, 4);
319 breaks
[0] = loc
+ INSNLEN (insn
);
321 breaks
[1] = branch_dest (opcode
, insn
, loc
, breaks
[0]);
323 /* Don't put two breakpoints on the same address. */
324 if (breaks
[1] == breaks
[0])
327 stepBreaks
[1].address
= 0;
329 for (ii
= 0; ii
< 2; ++ii
)
332 /* ignore invalid breakpoint. */
333 if (breaks
[ii
] == -1)
336 read_memory (breaks
[ii
], stepBreaks
[ii
].data
, 4);
338 write_memory (breaks
[ii
], breakp
, 4);
339 stepBreaks
[ii
].address
= breaks
[ii
];
346 /* remove step breakpoints. */
347 for (ii
= 0; ii
< 2; ++ii
)
348 if (stepBreaks
[ii
].address
!= 0)
350 (stepBreaks
[ii
].address
, stepBreaks
[ii
].data
, 4);
353 errno
= 0; /* FIXME, don't ignore errors! */
354 /* What errors? {read,write}_memory call error(). */
358 /* return pc value after skipping a function prologue and also return
359 information about a function frame.
361 in struct rs6000_framedata fdata:
362 - frameless is TRUE, if function does not have a frame.
363 - nosavedpc is TRUE, if function does not save %pc value in its frame.
364 - offset is the initial size of this stack frame --- the amount by
365 which we decrement the sp to allocate the frame.
366 - saved_gpr is the number of the first saved gpr.
367 - saved_fpr is the number of the first saved fpr.
368 - alloca_reg is the number of the register used for alloca() handling.
370 - gpr_offset is the offset of the first saved gpr from the previous frame.
371 - fpr_offset is the offset of the first saved fpr from the previous frame.
372 - lr_offset is the offset of the saved lr
373 - cr_offset is the offset of the saved cr
376 #define SIGNED_SHORT(x) \
377 ((sizeof (short) == 2) \
378 ? ((int)(short)(x)) \
379 : ((int)((((x) & 0xffff) ^ 0x8000) - 0x8000)))
381 #define GET_SRC_REG(x) (((x) >> 21) & 0x1f)
384 skip_prologue (CORE_ADDR pc
, CORE_ADDR lim_pc
, struct rs6000_framedata
*fdata
)
386 CORE_ADDR orig_pc
= pc
;
387 CORE_ADDR last_prologue_pc
;
395 int minimal_toc_loaded
= 0;
396 int prev_insn_was_prologue_insn
= 1;
398 memset (fdata
, 0, sizeof (struct rs6000_framedata
));
399 fdata
->saved_gpr
= -1;
400 fdata
->saved_fpr
= -1;
401 fdata
->alloca_reg
= -1;
402 fdata
->frameless
= 1;
403 fdata
->nosavedpc
= 1;
406 while (lim_pc
== 0 || pc
< lim_pc
- 4)
410 /* Sometimes it isn't clear if an instruction is a prologue
411 instruction or not. When we encounter one of these ambiguous
412 cases, we'll set prev_insn_was_prologue_insn to 0 (false).
413 Otherwise, we'll assume that it really is a prologue instruction. */
414 if (prev_insn_was_prologue_insn
)
415 last_prologue_pc
= pc
;
416 prev_insn_was_prologue_insn
= 1;
418 if (target_read_memory (pc
, buf
, 4))
420 op
= extract_signed_integer (buf
, 4);
422 if ((op
& 0xfc1fffff) == 0x7c0802a6)
424 lr_reg
= (op
& 0x03e00000) | 0x90010000;
428 else if ((op
& 0xfc1fffff) == 0x7c000026)
430 cr_reg
= (op
& 0x03e00000) | 0x90010000;
434 else if ((op
& 0xfc1f0000) == 0xd8010000)
435 { /* stfd Rx,NUM(r1) */
436 reg
= GET_SRC_REG (op
);
437 if (fdata
->saved_fpr
== -1 || fdata
->saved_fpr
> reg
)
439 fdata
->saved_fpr
= reg
;
440 fdata
->fpr_offset
= SIGNED_SHORT (op
) + offset
;
445 else if (((op
& 0xfc1f0000) == 0xbc010000) || /* stm Rx, NUM(r1) */
446 (((op
& 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
447 (op
& 0xfc1f0003) == 0xf8010000) && /* std rx,NUM(r1) */
448 (op
& 0x03e00000) >= 0x01a00000)) /* rx >= r13 */
451 reg
= GET_SRC_REG (op
);
452 if (fdata
->saved_gpr
== -1 || fdata
->saved_gpr
> reg
)
454 fdata
->saved_gpr
= reg
;
455 if ((op
& 0xfc1f0003) == 0xf8010000)
457 fdata
->gpr_offset
= SIGNED_SHORT (op
) + offset
;
462 else if ((op
& 0xffff0000) == 0x60000000)
465 /* Allow nops in the prologue, but do not consider them to
466 be part of the prologue unless followed by other prologue
468 prev_insn_was_prologue_insn
= 0;
472 else if ((op
& 0xffff0000) == 0x3c000000)
473 { /* addis 0,0,NUM, used
475 fdata
->offset
= (op
& 0x0000ffff) << 16;
476 fdata
->frameless
= 0;
480 else if ((op
& 0xffff0000) == 0x60000000)
481 { /* ori 0,0,NUM, 2nd ha
482 lf of >= 32k frames */
483 fdata
->offset
|= (op
& 0x0000ffff);
484 fdata
->frameless
= 0;
488 else if (lr_reg
!= -1 && (op
& 0xffff0000) == lr_reg
)
491 fdata
->lr_offset
= SIGNED_SHORT (op
) + offset
;
492 fdata
->nosavedpc
= 0;
497 else if (cr_reg
!= -1 && (op
& 0xffff0000) == cr_reg
)
500 fdata
->cr_offset
= SIGNED_SHORT (op
) + offset
;
505 else if (op
== 0x48000005)
511 else if (op
== 0x48000004)
516 else if (((op
& 0xffff0000) == 0x801e0000 || /* lwz 0,NUM(r30), used
517 in V.4 -mrelocatable */
518 op
== 0x7fc0f214) && /* add r30,r0,r30, used
519 in V.4 -mrelocatable */
520 lr_reg
== 0x901e0000)
525 else if ((op
& 0xffff0000) == 0x3fc00000 || /* addis 30,0,foo@ha, used
526 in V.4 -mminimal-toc */
527 (op
& 0xffff0000) == 0x3bde0000)
528 { /* addi 30,30,foo@l */
532 else if ((op
& 0xfc000001) == 0x48000001)
536 fdata
->frameless
= 0;
537 /* Don't skip over the subroutine call if it is not within the first
538 three instructions of the prologue. */
539 if ((pc
- orig_pc
) > 8)
542 op
= read_memory_integer (pc
+ 4, 4);
544 /* At this point, make sure this is not a trampoline function
545 (a function that simply calls another functions, and nothing else).
546 If the next is not a nop, this branch was part of the function
549 if (op
== 0x4def7b82 || op
== 0) /* crorc 15, 15, 15 */
550 break; /* don't skip over
554 /* update stack pointer */
556 else if ((op
& 0xffff0000) == 0x94210000 || /* stu r1,NUM(r1) */
557 (op
& 0xffff0003) == 0xf8210001) /* stdu r1,NUM(r1) */
559 fdata
->frameless
= 0;
560 if ((op
& 0xffff0003) == 0xf8210001)
562 fdata
->offset
= SIGNED_SHORT (op
);
563 offset
= fdata
->offset
;
567 else if (op
== 0x7c21016e)
569 fdata
->frameless
= 0;
570 offset
= fdata
->offset
;
573 /* Load up minimal toc pointer */
575 else if ((op
>> 22) == 0x20f
576 && !minimal_toc_loaded
)
577 { /* l r31,... or l r30,... */
578 minimal_toc_loaded
= 1;
581 /* move parameters from argument registers to local variable
584 else if ((op
& 0xfc0007fe) == 0x7c000378 && /* mr(.) Rx,Ry */
585 (((op
>> 21) & 31) >= 3) && /* R3 >= Ry >= R10 */
586 (((op
>> 21) & 31) <= 10) &&
587 (((op
>> 16) & 31) >= fdata
->saved_gpr
)) /* Rx: local var reg */
591 /* store parameters in stack */
593 else if ((op
& 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
594 (op
& 0xfc1f0003) == 0xf8010000 || /* std rx,NUM(r1) */
595 (op
& 0xfc1f0000) == 0xd8010000 || /* stfd Rx,NUM(r1) */
596 (op
& 0xfc1f0000) == 0xfc010000) /* frsp, fp?,NUM(r1) */
600 /* store parameters in stack via frame pointer */
603 ((op
& 0xfc1f0000) == 0x901f0000 || /* st rx,NUM(r1) */
604 (op
& 0xfc1f0000) == 0xd81f0000 || /* stfd Rx,NUM(r1) */
605 (op
& 0xfc1f0000) == 0xfc1f0000))
606 { /* frsp, fp?,NUM(r1) */
609 /* Set up frame pointer */
611 else if (op
== 0x603f0000 /* oril r31, r1, 0x0 */
614 fdata
->frameless
= 0;
616 fdata
->alloca_reg
= 31;
619 /* Another way to set up the frame pointer. */
621 else if ((op
& 0xfc1fffff) == 0x38010000)
622 { /* addi rX, r1, 0x0 */
623 fdata
->frameless
= 0;
625 fdata
->alloca_reg
= (op
& ~0x38010000) >> 21;
636 /* I have problems with skipping over __main() that I need to address
637 * sometime. Previously, I used to use misc_function_vector which
638 * didn't work as well as I wanted to be. -MGO */
640 /* If the first thing after skipping a prolog is a branch to a function,
641 this might be a call to an initializer in main(), introduced by gcc2.
642 We'd like to skip over it as well. Fortunately, xlc does some extra
643 work before calling a function right after a prologue, thus we can
644 single out such gcc2 behaviour. */
647 if ((op
& 0xfc000001) == 0x48000001)
648 { /* bl foo, an initializer function? */
649 op
= read_memory_integer (pc
+ 4, 4);
651 if (op
== 0x4def7b82)
652 { /* cror 0xf, 0xf, 0xf (nop) */
654 /* check and see if we are in main. If so, skip over this initializer
657 tmp
= find_pc_misc_function (pc
);
658 if (tmp
>= 0 && STREQ (misc_function_vector
[tmp
].name
, "main"))
664 fdata
->offset
= -fdata
->offset
;
665 return last_prologue_pc
;
669 /*************************************************************************
670 Support for creating pushing a dummy frame into the stack, and popping
672 *************************************************************************/
675 /* Pop the innermost frame, go back to the caller. */
678 rs6000_pop_frame (void)
680 CORE_ADDR pc
, lr
, sp
, prev_sp
, addr
; /* %pc, %lr, %sp */
681 struct rs6000_framedata fdata
;
682 struct frame_info
*frame
= get_current_frame ();
686 sp
= FRAME_FP (frame
);
688 if (PC_IN_CALL_DUMMY (frame
->pc
, frame
->frame
, frame
->frame
))
690 generic_pop_dummy_frame ();
691 flush_cached_frames ();
695 /* Make sure that all registers are valid. */
696 read_register_bytes (0, NULL
, REGISTER_BYTES
);
698 /* figure out previous %pc value. If the function is frameless, it is
699 still in the link register, otherwise walk the frames and retrieve the
700 saved %pc value in the previous frame. */
702 addr
= get_pc_function_start (frame
->pc
);
703 (void) skip_prologue (addr
, frame
->pc
, &fdata
);
705 wordsize
= TDEP
->wordsize
;
709 prev_sp
= read_memory_addr (sp
, wordsize
);
710 if (fdata
.lr_offset
== 0)
711 lr
= read_register (PPC_LR_REGNUM
);
713 lr
= read_memory_addr (prev_sp
+ fdata
.lr_offset
, wordsize
);
715 /* reset %pc value. */
716 write_register (PC_REGNUM
, lr
);
718 /* reset register values if any was saved earlier. */
720 if (fdata
.saved_gpr
!= -1)
722 addr
= prev_sp
+ fdata
.gpr_offset
;
723 for (ii
= fdata
.saved_gpr
; ii
<= 31; ++ii
)
725 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
)], wordsize
);
730 if (fdata
.saved_fpr
!= -1)
732 addr
= prev_sp
+ fdata
.fpr_offset
;
733 for (ii
= fdata
.saved_fpr
; ii
<= 31; ++ii
)
735 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
+ FP0_REGNUM
)], 8);
740 write_register (SP_REGNUM
, prev_sp
);
741 target_store_registers (-1);
742 flush_cached_frames ();
745 /* Fixup the call sequence of a dummy function, with the real function
746 address. Its arguments will be passed by gdb. */
749 rs6000_fix_call_dummy (char *dummyname
, CORE_ADDR pc
, CORE_ADDR fun
,
750 int nargs
, value_ptr
*args
, struct type
*type
,
753 #define TOC_ADDR_OFFSET 20
754 #define TARGET_ADDR_OFFSET 28
757 CORE_ADDR target_addr
;
759 if (rs6000_find_toc_address_hook
!= NULL
)
761 CORE_ADDR tocvalue
= (*rs6000_find_toc_address_hook
) (fun
);
762 write_register (PPC_TOC_REGNUM
, tocvalue
);
766 /* Pass the arguments in either registers, or in the stack. In RS/6000,
767 the first eight words of the argument list (that might be less than
768 eight parameters if some parameters occupy more than one word) are
769 passed in r3..r10 registers. float and double parameters are
770 passed in fpr's, in addition to that. Rest of the parameters if any
771 are passed in user stack. There might be cases in which half of the
772 parameter is copied into registers, the other half is pushed into
775 Stack must be aligned on 64-bit boundaries when synthesizing
778 If the function is returning a structure, then the return address is passed
779 in r3, then the first 7 words of the parameters can be passed in registers,
783 rs6000_push_arguments (int nargs
, value_ptr
*args
, CORE_ADDR sp
,
784 int struct_return
, CORE_ADDR struct_addr
)
788 int argno
; /* current argument number */
789 int argbytes
; /* current argument byte */
791 int f_argno
= 0; /* current floating point argno */
792 int wordsize
= TDEP
->wordsize
;
799 /* The first eight words of ther arguments are passed in registers. Copy
802 If the function is returning a `struct', then the first word (which
803 will be passed in r3) is used for struct return address. In that
804 case we should advance one word and start from r4 register to copy
807 ii
= struct_return
? 1 : 0;
810 effectively indirect call... gcc does...
812 return_val example( float, int);
815 float in fp0, int in r3
816 offset of stack on overflow 8/16
817 for varargs, must go by type.
819 float in r3&r4, int in r5
820 offset of stack on overflow different
822 return in r3 or f0. If no float, must study how gcc emulates floats;
823 pay attention to arg promotion.
824 User may have to cast\args to handle promotion correctly
825 since gdb won't know if prototype supplied or not.
828 for (argno
= 0, argbytes
= 0; argno
< nargs
&& ii
< 8; ++ii
)
830 int reg_size
= REGISTER_RAW_SIZE (ii
+ 3);
833 type
= check_typedef (VALUE_TYPE (arg
));
834 len
= TYPE_LENGTH (type
);
836 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
839 /* floating point arguments are passed in fpr's, as well as gpr's.
840 There are 13 fpr's reserved for passing parameters. At this point
841 there is no way we would run out of them. */
845 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
847 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
+ 1 + f_argno
)],
848 VALUE_CONTENTS (arg
),
856 /* Argument takes more than one register. */
857 while (argbytes
< len
)
859 memset (®isters
[REGISTER_BYTE (ii
+ 3)], 0, reg_size
);
860 memcpy (®isters
[REGISTER_BYTE (ii
+ 3)],
861 ((char *) VALUE_CONTENTS (arg
)) + argbytes
,
862 (len
- argbytes
) > reg_size
863 ? reg_size
: len
- argbytes
);
864 ++ii
, argbytes
+= reg_size
;
867 goto ran_out_of_registers_for_arguments
;
873 { /* Argument can fit in one register. No problem. */
874 int adj
= TARGET_BYTE_ORDER
== BIG_ENDIAN
? reg_size
- len
: 0;
875 memset (®isters
[REGISTER_BYTE (ii
+ 3)], 0, reg_size
);
876 memcpy ((char *)®isters
[REGISTER_BYTE (ii
+ 3)] + adj
,
877 VALUE_CONTENTS (arg
), len
);
882 ran_out_of_registers_for_arguments
:
884 saved_sp
= read_sp ();
885 #ifndef ELF_OBJECT_FORMAT
886 /* location for 8 parameters are always reserved. */
889 /* another six words for back chain, TOC register, link register, etc. */
892 /* stack pointer must be quadword aligned */
896 /* if there are more arguments, allocate space for them in
897 the stack, then push them starting from the ninth one. */
899 if ((argno
< nargs
) || argbytes
)
905 space
+= ((len
- argbytes
+ 3) & -4);
911 for (; jj
< nargs
; ++jj
)
913 value_ptr val
= args
[jj
];
914 space
+= ((TYPE_LENGTH (VALUE_TYPE (val
))) + 3) & -4;
917 /* add location required for the rest of the parameters */
918 space
= (space
+ 15) & -16;
921 /* This is another instance we need to be concerned about securing our
922 stack space. If we write anything underneath %sp (r1), we might conflict
923 with the kernel who thinks he is free to use this area. So, update %sp
924 first before doing anything else. */
926 write_register (SP_REGNUM
, sp
);
928 /* if the last argument copied into the registers didn't fit there
929 completely, push the rest of it into stack. */
933 write_memory (sp
+ 24 + (ii
* 4),
934 ((char *) VALUE_CONTENTS (arg
)) + argbytes
,
937 ii
+= ((len
- argbytes
+ 3) & -4) / 4;
940 /* push the rest of the arguments into stack. */
941 for (; argno
< nargs
; ++argno
)
945 type
= check_typedef (VALUE_TYPE (arg
));
946 len
= TYPE_LENGTH (type
);
949 /* float types should be passed in fpr's, as well as in the stack. */
950 if (TYPE_CODE (type
) == TYPE_CODE_FLT
&& f_argno
< 13)
955 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
957 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
+ 1 + f_argno
)],
958 VALUE_CONTENTS (arg
),
963 write_memory (sp
+ 24 + (ii
* 4), (char *) VALUE_CONTENTS (arg
), len
);
964 ii
+= ((len
+ 3) & -4) / 4;
968 /* Secure stack areas first, before doing anything else. */
969 write_register (SP_REGNUM
, sp
);
971 /* set back chain properly */
972 store_address (tmp_buffer
, 4, saved_sp
);
973 write_memory (sp
, tmp_buffer
, 4);
975 target_store_registers (-1);
979 /* Function: ppc_push_return_address (pc, sp)
980 Set up the return address for the inferior function call. */
983 ppc_push_return_address (CORE_ADDR pc
, CORE_ADDR sp
)
985 write_register (PPC_LR_REGNUM
, CALL_DUMMY_ADDRESS ());
989 /* Extract a function return value of type TYPE from raw register array
990 REGBUF, and copy that return value into VALBUF in virtual format. */
993 rs6000_extract_return_value (struct type
*valtype
, char *regbuf
, char *valbuf
)
997 if (TYPE_CODE (valtype
) == TYPE_CODE_FLT
)
1002 /* floats and doubles are returned in fpr1. fpr's have a size of 8 bytes.
1003 We need to truncate the return value into float size (4 byte) if
1006 if (TYPE_LENGTH (valtype
) > 4) /* this is a double */
1008 ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)],
1009 TYPE_LENGTH (valtype
));
1012 memcpy (&dd
, ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)], 8);
1014 memcpy (valbuf
, &ff
, sizeof (float));
1019 /* return value is copied starting from r3. */
1020 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
1021 && TYPE_LENGTH (valtype
) < REGISTER_RAW_SIZE (3))
1022 offset
= REGISTER_RAW_SIZE (3) - TYPE_LENGTH (valtype
);
1025 regbuf
+ REGISTER_BYTE (3) + offset
,
1026 TYPE_LENGTH (valtype
));
1030 /* Keep structure return address in this variable.
1031 FIXME: This is a horrid kludge which should not be allowed to continue
1032 living. This only allows a single nested call to a structure-returning
1033 function. Come on, guys! -- gnu@cygnus.com, Aug 92 */
1035 static CORE_ADDR rs6000_struct_return_address
;
1037 /* Indirect function calls use a piece of trampoline code to do context
1038 switching, i.e. to set the new TOC table. Skip such code if we are on
1039 its first instruction (as when we have single-stepped to here).
1040 Also skip shared library trampoline code (which is different from
1041 indirect function call trampolines).
1042 Result is desired PC to step until, or NULL if we are not in
1046 rs6000_skip_trampoline_code (CORE_ADDR pc
)
1048 register unsigned int ii
, op
;
1049 CORE_ADDR solib_target_pc
;
1051 static unsigned trampoline_code
[] =
1053 0x800b0000, /* l r0,0x0(r11) */
1054 0x90410014, /* st r2,0x14(r1) */
1055 0x7c0903a6, /* mtctr r0 */
1056 0x804b0004, /* l r2,0x4(r11) */
1057 0x816b0008, /* l r11,0x8(r11) */
1058 0x4e800420, /* bctr */
1059 0x4e800020, /* br */
1063 /* If pc is in a shared library trampoline, return its target. */
1064 solib_target_pc
= find_solib_trampoline_target (pc
);
1065 if (solib_target_pc
)
1066 return solib_target_pc
;
1068 for (ii
= 0; trampoline_code
[ii
]; ++ii
)
1070 op
= read_memory_integer (pc
+ (ii
* 4), 4);
1071 if (op
!= trampoline_code
[ii
])
1074 ii
= read_register (11); /* r11 holds destination addr */
1075 pc
= read_memory_addr (ii
, TDEP
->wordsize
); /* (r11) value */
1079 /* Determines whether the function FI has a frame on the stack or not. */
1082 rs6000_frameless_function_invocation (struct frame_info
*fi
)
1084 CORE_ADDR func_start
;
1085 struct rs6000_framedata fdata
;
1087 /* Don't even think about framelessness except on the innermost frame
1088 or if the function was interrupted by a signal. */
1089 if (fi
->next
!= NULL
&& !fi
->next
->signal_handler_caller
)
1092 func_start
= get_pc_function_start (fi
->pc
);
1094 /* If we failed to find the start of the function, it is a mistake
1095 to inspect the instructions. */
1099 /* A frame with a zero PC is usually created by dereferencing a NULL
1100 function pointer, normally causing an immediate core dump of the
1101 inferior. Mark function as frameless, as the inferior has no chance
1102 of setting up a stack frame. */
1109 (void) skip_prologue (func_start
, fi
->pc
, &fdata
);
1110 return fdata
.frameless
;
1113 /* Return the PC saved in a frame */
1116 rs6000_frame_saved_pc (struct frame_info
*fi
)
1118 CORE_ADDR func_start
;
1119 struct rs6000_framedata fdata
;
1120 int wordsize
= TDEP
->wordsize
;
1122 if (fi
->signal_handler_caller
)
1123 return read_memory_addr (fi
->frame
+ SIG_FRAME_PC_OFFSET
, wordsize
);
1125 if (PC_IN_CALL_DUMMY (fi
->pc
, fi
->frame
, fi
->frame
))
1126 return generic_read_register_dummy (fi
->pc
, fi
->frame
, PC_REGNUM
);
1128 func_start
= get_pc_function_start (fi
->pc
);
1130 /* If we failed to find the start of the function, it is a mistake
1131 to inspect the instructions. */
1135 (void) skip_prologue (func_start
, fi
->pc
, &fdata
);
1137 if (fdata
.lr_offset
== 0 && fi
->next
!= NULL
)
1139 if (fi
->next
->signal_handler_caller
)
1140 return read_memory_addr (fi
->next
->frame
+ SIG_FRAME_LR_OFFSET
,
1143 return read_memory_addr (FRAME_CHAIN (fi
) + DEFAULT_LR_SAVE
,
1147 if (fdata
.lr_offset
== 0)
1148 return read_register (PPC_LR_REGNUM
);
1150 return read_memory_addr (FRAME_CHAIN (fi
) + fdata
.lr_offset
, wordsize
);
1153 /* If saved registers of frame FI are not known yet, read and cache them.
1154 &FDATAP contains rs6000_framedata; TDATAP can be NULL,
1155 in which case the framedata are read. */
1158 frame_get_saved_regs (struct frame_info
*fi
, struct rs6000_framedata
*fdatap
)
1160 CORE_ADDR frame_addr
;
1161 struct rs6000_framedata work_fdata
;
1162 int wordsize
= TDEP
->wordsize
;
1169 fdatap
= &work_fdata
;
1170 (void) skip_prologue (get_pc_function_start (fi
->pc
), fi
->pc
, fdatap
);
1173 frame_saved_regs_zalloc (fi
);
1175 /* If there were any saved registers, figure out parent's stack
1177 /* The following is true only if the frame doesn't have a call to
1180 if (fdatap
->saved_fpr
== 0 && fdatap
->saved_gpr
== 0
1181 && fdatap
->lr_offset
== 0 && fdatap
->cr_offset
== 0)
1183 else if (fi
->prev
&& fi
->prev
->frame
)
1184 frame_addr
= fi
->prev
->frame
;
1186 frame_addr
= read_memory_addr (fi
->frame
, wordsize
);
1188 /* if != -1, fdatap->saved_fpr is the smallest number of saved_fpr.
1189 All fpr's from saved_fpr to fp31 are saved. */
1191 if (fdatap
->saved_fpr
>= 0)
1194 CORE_ADDR fpr_addr
= frame_addr
+ fdatap
->fpr_offset
;
1195 for (i
= fdatap
->saved_fpr
; i
< 32; i
++)
1197 fi
->saved_regs
[FP0_REGNUM
+ i
] = fpr_addr
;
1202 /* if != -1, fdatap->saved_gpr is the smallest number of saved_gpr.
1203 All gpr's from saved_gpr to gpr31 are saved. */
1205 if (fdatap
->saved_gpr
>= 0)
1208 CORE_ADDR gpr_addr
= frame_addr
+ fdatap
->gpr_offset
;
1209 for (i
= fdatap
->saved_gpr
; i
< 32; i
++)
1211 fi
->saved_regs
[i
] = gpr_addr
;
1212 gpr_addr
+= wordsize
;
1216 /* If != 0, fdatap->cr_offset is the offset from the frame that holds
1218 if (fdatap
->cr_offset
!= 0)
1219 fi
->saved_regs
[PPC_CR_REGNUM
] = frame_addr
+ fdatap
->cr_offset
;
1221 /* If != 0, fdatap->lr_offset is the offset from the frame that holds
1223 if (fdatap
->lr_offset
!= 0)
1224 fi
->saved_regs
[PPC_LR_REGNUM
] = frame_addr
+ fdatap
->lr_offset
;
1227 /* Return the address of a frame. This is the inital %sp value when the frame
1228 was first allocated. For functions calling alloca(), it might be saved in
1229 an alloca register. */
1232 frame_initial_stack_address (struct frame_info
*fi
)
1235 struct rs6000_framedata fdata
;
1236 struct frame_info
*callee_fi
;
1238 /* if the initial stack pointer (frame address) of this frame is known,
1241 if (fi
->extra_info
->initial_sp
)
1242 return fi
->extra_info
->initial_sp
;
1244 /* find out if this function is using an alloca register.. */
1246 (void) skip_prologue (get_pc_function_start (fi
->pc
), fi
->pc
, &fdata
);
1248 /* if saved registers of this frame are not known yet, read and cache them. */
1250 if (!fi
->saved_regs
)
1251 frame_get_saved_regs (fi
, &fdata
);
1253 /* If no alloca register used, then fi->frame is the value of the %sp for
1254 this frame, and it is good enough. */
1256 if (fdata
.alloca_reg
< 0)
1258 fi
->extra_info
->initial_sp
= fi
->frame
;
1259 return fi
->extra_info
->initial_sp
;
1262 /* This function has an alloca register. If this is the top-most frame
1263 (with the lowest address), the value in alloca register is good. */
1266 return fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1268 /* Otherwise, this is a caller frame. Callee has usually already saved
1269 registers, but there are exceptions (such as when the callee
1270 has no parameters). Find the address in which caller's alloca
1271 register is saved. */
1273 for (callee_fi
= fi
->next
; callee_fi
; callee_fi
= callee_fi
->next
)
1276 if (!callee_fi
->saved_regs
)
1277 frame_get_saved_regs (callee_fi
, NULL
);
1279 /* this is the address in which alloca register is saved. */
1281 tmpaddr
= callee_fi
->saved_regs
[fdata
.alloca_reg
];
1284 fi
->extra_info
->initial_sp
=
1285 read_memory_addr (tmpaddr
, TDEP
->wordsize
);
1286 return fi
->extra_info
->initial_sp
;
1289 /* Go look into deeper levels of the frame chain to see if any one of
1290 the callees has saved alloca register. */
1293 /* If alloca register was not saved, by the callee (or any of its callees)
1294 then the value in the register is still good. */
1296 fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1297 return fi
->extra_info
->initial_sp
;
1300 /* Describe the pointer in each stack frame to the previous stack frame
1303 /* FRAME_CHAIN takes a frame's nominal address
1304 and produces the frame's chain-pointer. */
1306 /* In the case of the RS/6000, the frame's nominal address
1307 is the address of a 4-byte word containing the calling frame's address. */
1310 rs6000_frame_chain (struct frame_info
*thisframe
)
1312 CORE_ADDR fp
, fpp
, lr
;
1313 int wordsize
= TDEP
->wordsize
;
1315 if (PC_IN_CALL_DUMMY (thisframe
->pc
, thisframe
->frame
, thisframe
->frame
))
1316 return thisframe
->frame
; /* dummy frame same as caller's frame */
1318 if (inside_entry_file (thisframe
->pc
) ||
1319 thisframe
->pc
== entry_point_address ())
1322 if (thisframe
->signal_handler_caller
)
1323 fp
= read_memory_addr (thisframe
->frame
+ SIG_FRAME_FP_OFFSET
,
1325 else if (thisframe
->next
!= NULL
1326 && thisframe
->next
->signal_handler_caller
1327 && FRAMELESS_FUNCTION_INVOCATION (thisframe
))
1328 /* A frameless function interrupted by a signal did not change the
1330 fp
= FRAME_FP (thisframe
);
1332 fp
= read_memory_addr ((thisframe
)->frame
, wordsize
);
1334 lr
= read_register (PPC_LR_REGNUM
);
1335 if (lr
== entry_point_address ())
1336 if (fp
!= 0 && (fpp
= read_memory_addr (fp
, wordsize
)) != 0)
1337 if (PC_IN_CALL_DUMMY (lr
, fpp
, fpp
))
1343 /* Return the size of register REG when words are WORDSIZE bytes long. If REG
1344 isn't available with that word size, return 0. */
1347 regsize (const struct reg
*reg
, int wordsize
)
1349 return wordsize
== 8 ? reg
->sz64
: reg
->sz32
;
1352 /* Return the name of register number N, or null if no such register exists
1353 in the current architecture. */
1356 rs6000_register_name (int n
)
1358 struct gdbarch_tdep
*tdep
= TDEP
;
1359 const struct reg
*reg
= tdep
->regs
+ n
;
1361 if (!regsize (reg
, tdep
->wordsize
))
1366 /* Index within `registers' of the first byte of the space for
1370 rs6000_register_byte (int n
)
1372 return TDEP
->regoff
[n
];
1375 /* Return the number of bytes of storage in the actual machine representation
1376 for register N if that register is available, else return 0. */
1379 rs6000_register_raw_size (int n
)
1381 struct gdbarch_tdep
*tdep
= TDEP
;
1382 const struct reg
*reg
= tdep
->regs
+ n
;
1383 return regsize (reg
, tdep
->wordsize
);
1386 /* Number of bytes of storage in the program's representation
1390 rs6000_register_virtual_size (int n
)
1392 return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (n
));
1395 /* Return the GDB type object for the "standard" data type
1396 of data in register N. */
1398 static struct type
*
1399 rs6000_register_virtual_type (int n
)
1401 struct gdbarch_tdep
*tdep
= TDEP
;
1402 const struct reg
*reg
= tdep
->regs
+ n
;
1404 return reg
->fpr
? builtin_type_double
:
1405 regsize (reg
, tdep
->wordsize
) == 8 ? builtin_type_int64
:
1409 /* For the PowerPC, it appears that the debug info marks float parameters as
1410 floats regardless of whether the function is prototyped, but the actual
1411 values are always passed in as doubles. Tell gdb to always assume that
1412 floats are passed as doubles and then converted in the callee. */
1415 rs6000_coerce_float_to_double (struct type
*formal
, struct type
*actual
)
1420 /* Return whether register N requires conversion when moving from raw format
1423 The register format for RS/6000 floating point registers is always
1424 double, we need a conversion if the memory format is float. */
1427 rs6000_register_convertible (int n
)
1429 const struct reg
*reg
= TDEP
->regs
+ n
;
1433 /* Convert data from raw format for register N in buffer FROM
1434 to virtual format with type TYPE in buffer TO. */
1437 rs6000_register_convert_to_virtual (int n
, struct type
*type
,
1438 char *from
, char *to
)
1440 if (TYPE_LENGTH (type
) != REGISTER_RAW_SIZE (n
))
1442 double val
= extract_floating (from
, REGISTER_RAW_SIZE (n
));
1443 store_floating (to
, TYPE_LENGTH (type
), val
);
1446 memcpy (to
, from
, REGISTER_RAW_SIZE (n
));
1449 /* Convert data from virtual format with type TYPE in buffer FROM
1450 to raw format for register N in buffer TO. */
1453 rs6000_register_convert_to_raw (struct type
*type
, int n
,
1454 char *from
, char *to
)
1456 if (TYPE_LENGTH (type
) != REGISTER_RAW_SIZE (n
))
1458 double val
= extract_floating (from
, TYPE_LENGTH (type
));
1459 store_floating (to
, REGISTER_RAW_SIZE (n
), val
);
1462 memcpy (to
, from
, REGISTER_RAW_SIZE (n
));
1465 /* Store the address of the place in which to copy the structure the
1466 subroutine will return. This is called from call_function.
1468 In RS/6000, struct return addresses are passed as an extra parameter in r3.
1469 In function return, callee is not responsible of returning this address
1470 back. Since gdb needs to find it, we will store in a designated variable
1471 `rs6000_struct_return_address'. */
1474 rs6000_store_struct_return (CORE_ADDR addr
, CORE_ADDR sp
)
1476 write_register (3, addr
);
1477 rs6000_struct_return_address
= addr
;
1480 /* Write into appropriate registers a function return value
1481 of type TYPE, given in virtual format. */
1484 rs6000_store_return_value (struct type
*type
, char *valbuf
)
1486 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
1488 /* Floating point values are returned starting from FPR1 and up.
1489 Say a double_double_double type could be returned in
1490 FPR1/FPR2/FPR3 triple. */
1492 write_register_bytes (REGISTER_BYTE (FP0_REGNUM
+ 1), valbuf
,
1493 TYPE_LENGTH (type
));
1495 /* Everything else is returned in GPR3 and up. */
1496 write_register_bytes (REGISTER_BYTE (PPC_GP0_REGNUM
+ 3), valbuf
,
1497 TYPE_LENGTH (type
));
1500 /* Extract from an array REGBUF containing the (raw) register state
1501 the address in which a function should return its structure value,
1502 as a CORE_ADDR (or an expression that can be used as one). */
1505 rs6000_extract_struct_value_address (char *regbuf
)
1507 return rs6000_struct_return_address
;
1510 /* Return whether PC is in a dummy function call.
1512 FIXME: This just checks for the end of the stack, which is broken
1513 for things like stepping through gcc nested function stubs. */
1516 rs6000_pc_in_call_dummy (CORE_ADDR pc
, CORE_ADDR sp
, CORE_ADDR fp
)
1518 return sp
< pc
&& pc
< fp
;
1521 /* Hook called when a new child process is started. */
1524 rs6000_create_inferior (int pid
)
1526 if (rs6000_set_host_arch_hook
)
1527 rs6000_set_host_arch_hook (pid
);
1530 /* Support for CONVERT_FROM_FUNC_PTR_ADDR(ADDR).
1532 Usually a function pointer's representation is simply the address
1533 of the function. On the RS/6000 however, a function pointer is
1534 represented by a pointer to a TOC entry. This TOC entry contains
1535 three words, the first word is the address of the function, the
1536 second word is the TOC pointer (r2), and the third word is the
1537 static chain value. Throughout GDB it is currently assumed that a
1538 function pointer contains the address of the function, which is not
1539 easy to fix. In addition, the conversion of a function address to
1540 a function pointer would require allocation of a TOC entry in the
1541 inferior's memory space, with all its drawbacks. To be able to
1542 call C++ virtual methods in the inferior (which are called via
1543 function pointers), find_function_addr uses this function to get the
1544 function address from a function pointer. */
1546 /* Return real function address if ADDR (a function pointer) is in the data
1547 space and is therefore a special function pointer. */
1550 rs6000_convert_from_func_ptr_addr (CORE_ADDR addr
)
1552 struct obj_section
*s
;
1554 s
= find_pc_section (addr
);
1555 if (s
&& s
->the_bfd_section
->flags
& SEC_CODE
)
1558 /* ADDR is in the data space, so it's a special function pointer. */
1559 return read_memory_addr (addr
, TDEP
->wordsize
);
1563 /* Handling the various POWER/PowerPC variants. */
1566 /* The arrays here called registers_MUMBLE hold information about available
1569 For each family of PPC variants, I've tried to isolate out the
1570 common registers and put them up front, so that as long as you get
1571 the general family right, GDB will correctly identify the registers
1572 common to that family. The common register sets are:
1574 For the 60x family: hid0 hid1 iabr dabr pir
1576 For the 505 and 860 family: eie eid nri
1578 For the 403 and 403GC: icdbdr esr dear evpr cdbcr tsr tcr pit tbhi
1579 tblo srr2 srr3 dbsr dbcr iac1 iac2 dac1 dac2 dccr iccr pbl1
1582 Most of these register groups aren't anything formal. I arrived at
1583 them by looking at the registers that occurred in more than one
1586 /* Convenience macros for populating register arrays. */
1588 /* Within another macro, convert S to a string. */
1592 /* Return a struct reg defining register NAME that's 32 bits on 32-bit systems
1593 and 64 bits on 64-bit systems. */
1594 #define R(name) { STR(name), 4, 8, 0 }
1596 /* Return a struct reg defining register NAME that's 32 bits on all
1598 #define R4(name) { STR(name), 4, 4, 0 }
1600 /* Return a struct reg defining register NAME that's 64 bits on all
1602 #define R8(name) { STR(name), 8, 8, 0 }
1604 /* Return a struct reg defining floating-point register NAME. */
1605 #define F(name) { STR(name), 8, 8, 1 }
1607 /* Return a struct reg defining register NAME that's 32 bits on 32-bit
1608 systems and that doesn't exist on 64-bit systems. */
1609 #define R32(name) { STR(name), 4, 0, 0 }
1611 /* Return a struct reg defining register NAME that's 64 bits on 64-bit
1612 systems and that doesn't exist on 32-bit systems. */
1613 #define R64(name) { STR(name), 0, 8, 0 }
1615 /* Return a struct reg placeholder for a register that doesn't exist. */
1616 #define R0 { 0, 0, 0, 0 }
1618 /* UISA registers common across all architectures, including POWER. */
1620 #define COMMON_UISA_REGS \
1621 /* 0 */ R(r0), R(r1), R(r2), R(r3), R(r4), R(r5), R(r6), R(r7), \
1622 /* 8 */ R(r8), R(r9), R(r10),R(r11),R(r12),R(r13),R(r14),R(r15), \
1623 /* 16 */ R(r16),R(r17),R(r18),R(r19),R(r20),R(r21),R(r22),R(r23), \
1624 /* 24 */ R(r24),R(r25),R(r26),R(r27),R(r28),R(r29),R(r30),R(r31), \
1625 /* 32 */ F(f0), F(f1), F(f2), F(f3), F(f4), F(f5), F(f6), F(f7), \
1626 /* 40 */ F(f8), F(f9), F(f10),F(f11),F(f12),F(f13),F(f14),F(f15), \
1627 /* 48 */ F(f16),F(f17),F(f18),F(f19),F(f20),F(f21),F(f22),F(f23), \
1628 /* 56 */ F(f24),F(f25),F(f26),F(f27),F(f28),F(f29),F(f30),F(f31), \
1629 /* 64 */ R(pc), R(ps)
1631 /* UISA-level SPRs for PowerPC. */
1632 #define PPC_UISA_SPRS \
1633 /* 66 */ R4(cr), R(lr), R(ctr), R4(xer), R0
1635 /* Segment registers, for PowerPC. */
1636 #define PPC_SEGMENT_REGS \
1637 /* 71 */ R32(sr0), R32(sr1), R32(sr2), R32(sr3), \
1638 /* 75 */ R32(sr4), R32(sr5), R32(sr6), R32(sr7), \
1639 /* 79 */ R32(sr8), R32(sr9), R32(sr10), R32(sr11), \
1640 /* 83 */ R32(sr12), R32(sr13), R32(sr14), R32(sr15)
1642 /* OEA SPRs for PowerPC. */
1643 #define PPC_OEA_SPRS \
1645 /* 88 */ R(ibat0u), R(ibat0l), R(ibat1u), R(ibat1l), \
1646 /* 92 */ R(ibat2u), R(ibat2l), R(ibat3u), R(ibat3l), \
1647 /* 96 */ R(dbat0u), R(dbat0l), R(dbat1u), R(dbat1l), \
1648 /* 100 */ R(dbat2u), R(dbat2l), R(dbat3u), R(dbat3l), \
1649 /* 104 */ R(sdr1), R64(asr), R(dar), R4(dsisr), \
1650 /* 108 */ R(sprg0), R(sprg1), R(sprg2), R(sprg3), \
1651 /* 112 */ R(srr0), R(srr1), R(tbl), R(tbu), \
1652 /* 116 */ R4(dec), R(dabr), R4(ear)
1654 /* IBM POWER (pre-PowerPC) architecture, user-level view. We only cover
1655 user-level SPR's. */
1656 static const struct reg registers_power
[] =
1659 /* 66 */ R4(cnd
), R(lr
), R(cnt
), R4(xer
), R4(mq
)
1662 /* PowerPC UISA - a PPC processor as viewed by user-level code. A UISA-only
1663 view of the PowerPC. */
1664 static const struct reg registers_powerpc
[] =
1670 /* IBM PowerPC 403. */
1671 static const struct reg registers_403
[] =
1677 /* 119 */ R(icdbdr
), R(esr
), R(dear
), R(evpr
),
1678 /* 123 */ R(cdbcr
), R(tsr
), R(tcr
), R(pit
),
1679 /* 127 */ R(tbhi
), R(tblo
), R(srr2
), R(srr3
),
1680 /* 131 */ R(dbsr
), R(dbcr
), R(iac1
), R(iac2
),
1681 /* 135 */ R(dac1
), R(dac2
), R(dccr
), R(iccr
),
1682 /* 139 */ R(pbl1
), R(pbu1
), R(pbl2
), R(pbu2
)
1685 /* IBM PowerPC 403GC. */
1686 static const struct reg registers_403GC
[] =
1692 /* 119 */ R(icdbdr
), R(esr
), R(dear
), R(evpr
),
1693 /* 123 */ R(cdbcr
), R(tsr
), R(tcr
), R(pit
),
1694 /* 127 */ R(tbhi
), R(tblo
), R(srr2
), R(srr3
),
1695 /* 131 */ R(dbsr
), R(dbcr
), R(iac1
), R(iac2
),
1696 /* 135 */ R(dac1
), R(dac2
), R(dccr
), R(iccr
),
1697 /* 139 */ R(pbl1
), R(pbu1
), R(pbl2
), R(pbu2
),
1698 /* 143 */ R(zpr
), R(pid
), R(sgr
), R(dcwr
),
1699 /* 147 */ R(tbhu
), R(tblu
)
1702 /* Motorola PowerPC 505. */
1703 static const struct reg registers_505
[] =
1709 /* 119 */ R(eie
), R(eid
), R(nri
)
1712 /* Motorola PowerPC 860 or 850. */
1713 static const struct reg registers_860
[] =
1719 /* 119 */ R(eie
), R(eid
), R(nri
), R(cmpa
),
1720 /* 123 */ R(cmpb
), R(cmpc
), R(cmpd
), R(icr
),
1721 /* 127 */ R(der
), R(counta
), R(countb
), R(cmpe
),
1722 /* 131 */ R(cmpf
), R(cmpg
), R(cmph
), R(lctrl1
),
1723 /* 135 */ R(lctrl2
), R(ictrl
), R(bar
), R(ic_cst
),
1724 /* 139 */ R(ic_adr
), R(ic_dat
), R(dc_cst
), R(dc_adr
),
1725 /* 143 */ R(dc_dat
), R(dpdr
), R(dpir
), R(immr
),
1726 /* 147 */ R(mi_ctr
), R(mi_ap
), R(mi_epn
), R(mi_twc
),
1727 /* 151 */ R(mi_rpn
), R(md_ctr
), R(m_casid
), R(md_ap
),
1728 /* 155 */ R(md_epn
), R(md_twb
), R(md_twc
), R(md_rpn
),
1729 /* 159 */ R(m_tw
), R(mi_dbcam
), R(mi_dbram0
), R(mi_dbram1
),
1730 /* 163 */ R(md_dbcam
), R(md_dbram0
), R(md_dbram1
)
1733 /* Motorola PowerPC 601. Note that the 601 has different register numbers
1734 for reading and writing RTCU and RTCL. However, how one reads and writes a
1735 register is the stub's problem. */
1736 static const struct reg registers_601
[] =
1742 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1743 /* 123 */ R(pir
), R(mq
), R(rtcu
), R(rtcl
)
1746 /* Motorola PowerPC 602. */
1747 static const struct reg registers_602
[] =
1753 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R0
,
1754 /* 123 */ R0
, R(tcr
), R(ibr
), R(esassr
),
1755 /* 127 */ R(sebr
), R(ser
), R(sp
), R(lt
)
1758 /* Motorola/IBM PowerPC 603 or 603e. */
1759 static const struct reg registers_603
[] =
1765 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R0
,
1766 /* 123 */ R0
, R(dmiss
), R(dcmp
), R(hash1
),
1767 /* 127 */ R(hash2
), R(imiss
), R(icmp
), R(rpa
)
1770 /* Motorola PowerPC 604 or 604e. */
1771 static const struct reg registers_604
[] =
1777 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1778 /* 123 */ R(pir
), R(mmcr0
), R(pmc1
), R(pmc2
),
1779 /* 127 */ R(sia
), R(sda
)
1782 /* Motorola/IBM PowerPC 750 or 740. */
1783 static const struct reg registers_750
[] =
1789 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1790 /* 123 */ R0
, R(ummcr0
), R(upmc1
), R(upmc2
),
1791 /* 127 */ R(usia
), R(ummcr1
), R(upmc3
), R(upmc4
),
1792 /* 131 */ R(mmcr0
), R(pmc1
), R(pmc2
), R(sia
),
1793 /* 135 */ R(mmcr1
), R(pmc3
), R(pmc4
), R(l2cr
),
1794 /* 139 */ R(ictc
), R(thrm1
), R(thrm2
), R(thrm3
)
1798 /* Information about a particular processor variant. */
1802 /* Name of this variant. */
1805 /* English description of the variant. */
1808 /* bfd_arch_info.arch corresponding to variant. */
1809 enum bfd_architecture arch
;
1811 /* bfd_arch_info.mach corresponding to variant. */
1814 /* Table of register names; registers[R] is the name of the register
1817 const struct reg
*regs
;
1820 #define num_registers(list) (sizeof (list) / sizeof((list)[0]))
1823 /* Information in this table comes from the following web sites:
1824 IBM: http://www.chips.ibm.com:80/products/embedded/
1825 Motorola: http://www.mot.com/SPS/PowerPC/
1827 I'm sure I've got some of the variant descriptions not quite right.
1828 Please report any inaccuracies you find to GDB's maintainer.
1830 If you add entries to this table, please be sure to allow the new
1831 value as an argument to the --with-cpu flag, in configure.in. */
1833 static const struct variant variants
[] =
1835 {"powerpc", "PowerPC user-level", bfd_arch_powerpc
,
1836 bfd_mach_ppc
, num_registers (registers_powerpc
), registers_powerpc
},
1837 {"power", "POWER user-level", bfd_arch_rs6000
,
1838 bfd_mach_rs6k
, num_registers (registers_power
), registers_power
},
1839 {"403", "IBM PowerPC 403", bfd_arch_powerpc
,
1840 bfd_mach_ppc_403
, num_registers (registers_403
), registers_403
},
1841 {"601", "Motorola PowerPC 601", bfd_arch_powerpc
,
1842 bfd_mach_ppc_601
, num_registers (registers_601
), registers_601
},
1843 {"602", "Motorola PowerPC 602", bfd_arch_powerpc
,
1844 bfd_mach_ppc_602
, num_registers (registers_602
), registers_602
},
1845 {"603", "Motorola/IBM PowerPC 603 or 603e", bfd_arch_powerpc
,
1846 bfd_mach_ppc_603
, num_registers (registers_603
), registers_603
},
1847 {"604", "Motorola PowerPC 604 or 604e", bfd_arch_powerpc
,
1848 604, num_registers (registers_604
), registers_604
},
1849 {"403GC", "IBM PowerPC 403GC", bfd_arch_powerpc
,
1850 bfd_mach_ppc_403gc
, num_registers (registers_403GC
), registers_403GC
},
1851 {"505", "Motorola PowerPC 505", bfd_arch_powerpc
,
1852 bfd_mach_ppc_505
, num_registers (registers_505
), registers_505
},
1853 {"860", "Motorola PowerPC 860 or 850", bfd_arch_powerpc
,
1854 bfd_mach_ppc_860
, num_registers (registers_860
), registers_860
},
1855 {"750", "Motorola/IBM PowerPC 750 or 740", bfd_arch_powerpc
,
1856 bfd_mach_ppc_750
, num_registers (registers_750
), registers_750
},
1858 /* FIXME: I haven't checked the register sets of the following. */
1859 {"620", "Motorola PowerPC 620", bfd_arch_powerpc
,
1860 bfd_mach_ppc_620
, num_registers (registers_powerpc
), registers_powerpc
},
1861 {"a35", "PowerPC A35", bfd_arch_powerpc
,
1862 bfd_mach_ppc_a35
, num_registers (registers_powerpc
), registers_powerpc
},
1863 {"rs1", "IBM POWER RS1", bfd_arch_rs6000
,
1864 bfd_mach_rs6k_rs1
, num_registers (registers_power
), registers_power
},
1865 {"rsc", "IBM POWER RSC", bfd_arch_rs6000
,
1866 bfd_mach_rs6k_rsc
, num_registers (registers_power
), registers_power
},
1867 {"rs2", "IBM POWER RS2", bfd_arch_rs6000
,
1868 bfd_mach_rs6k_rs2
, num_registers (registers_power
), registers_power
},
1873 #undef num_registers
1875 /* Look up the variant named NAME in the `variants' table. Return a
1876 pointer to the struct variant, or null if we couldn't find it. */
1878 static const struct variant
*
1879 find_variant_by_name (char *name
)
1881 const struct variant
*v
;
1883 for (v
= variants
; v
->name
; v
++)
1884 if (!strcmp (name
, v
->name
))
1890 /* Return the variant corresponding to architecture ARCH and machine number
1891 MACH. If no such variant exists, return null. */
1893 static const struct variant
*
1894 find_variant_by_arch (enum bfd_architecture arch
, unsigned long mach
)
1896 const struct variant
*v
;
1898 for (v
= variants
; v
->name
; v
++)
1899 if (arch
== v
->arch
&& mach
== v
->mach
)
1909 process_note_abi_tag_sections (bfd
*abfd
, asection
*sect
, void *obj
)
1911 int *os_ident_ptr
= obj
;
1913 unsigned int sectsize
;
1915 name
= bfd_get_section_name (abfd
, sect
);
1916 sectsize
= bfd_section_size (abfd
, sect
);
1917 if (strcmp (name
, ".note.ABI-tag") == 0 && sectsize
> 0)
1919 unsigned int name_length
, data_length
, note_type
;
1920 char *note
= alloca (sectsize
);
1922 bfd_get_section_contents (abfd
, sect
, note
,
1923 (file_ptr
) 0, (bfd_size_type
) sectsize
);
1925 name_length
= bfd_h_get_32 (abfd
, note
);
1926 data_length
= bfd_h_get_32 (abfd
, note
+ 4);
1927 note_type
= bfd_h_get_32 (abfd
, note
+ 8);
1929 if (name_length
== 4 && data_length
== 16 && note_type
== 1
1930 && strcmp (note
+ 12, "GNU") == 0)
1932 int os_number
= bfd_h_get_32 (abfd
, note
+ 16);
1934 /* The case numbers are from abi-tags in glibc */
1938 *os_ident_ptr
= ELFOSABI_LINUX
;
1941 *os_ident_ptr
= ELFOSABI_HURD
;
1944 *os_ident_ptr
= ELFOSABI_SOLARIS
;
1948 "process_note_abi_sections: unknown OS number %d", os_number
);
1955 /* Return one of the ELFOSABI_ constants for BFDs representing ELF
1956 executables. If it's not an ELF executable or if the OS/ABI couldn't
1957 be determined, simply return -1. */
1960 get_elfosabi (bfd
*abfd
)
1964 if (abfd
!= NULL
&& bfd_get_flavour (abfd
) == bfd_target_elf_flavour
)
1966 elfosabi
= elf_elfheader (abfd
)->e_ident
[EI_OSABI
];
1968 /* When elfosabi is 0 (ELFOSABI_NONE), this is supposed to indicate
1969 that we're on a SYSV system. However, GNU/Linux uses a note section
1970 to record OS/ABI info, but leaves e_ident[EI_OSABI] zero. So we
1971 have to check the note sections too. */
1974 bfd_map_over_sections (abfd
,
1975 process_note_abi_tag_sections
,
1985 /* Initialize the current architecture based on INFO. If possible, re-use an
1986 architecture from ARCHES, which is a list of architectures already created
1987 during this debugging session.
1989 Called e.g. at program startup, when reading a core file, and when reading
1992 static struct gdbarch
*
1993 rs6000_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
1995 struct gdbarch
*gdbarch
;
1996 struct gdbarch_tdep
*tdep
;
1997 int wordsize
, from_xcoff_exec
, from_elf_exec
, power
, i
, off
;
1999 const struct variant
*v
;
2000 enum bfd_architecture arch
;
2003 int osabi
, sysv_abi
;
2005 from_xcoff_exec
= info
.abfd
&& info
.abfd
->format
== bfd_object
&&
2006 bfd_get_flavour (info
.abfd
) == bfd_target_xcoff_flavour
;
2008 from_elf_exec
= info
.abfd
&& info
.abfd
->format
== bfd_object
&&
2009 bfd_get_flavour (info
.abfd
) == bfd_target_elf_flavour
;
2011 sysv_abi
= info
.abfd
&& bfd_get_flavour (info
.abfd
) == bfd_target_elf_flavour
;
2013 osabi
= get_elfosabi (info
.abfd
);
2015 /* Check word size. If INFO is from a binary file, infer it from that,
2016 else use the previously-inferred size. */
2017 if (from_xcoff_exec
)
2019 if (xcoff_data (info
.abfd
)->xcoff64
)
2024 else if (from_elf_exec
)
2026 if (elf_elfheader (info
.abfd
)->e_ident
[EI_CLASS
] == ELFCLASS64
)
2035 wordsize
= tdep
->wordsize
;
2040 /* Find a candidate among extant architectures. */
2041 for (arches
= gdbarch_list_lookup_by_info (arches
, &info
);
2043 arches
= gdbarch_list_lookup_by_info (arches
->next
, &info
))
2045 /* Word size in the various PowerPC bfd_arch_info structs isn't
2046 meaningful, because 64-bit CPUs can run in 32-bit mode. So, perform
2047 separate word size check. */
2048 tdep
= gdbarch_tdep (arches
->gdbarch
);
2049 if (tdep
&& tdep
->wordsize
== wordsize
&& tdep
->osabi
== osabi
)
2050 return arches
->gdbarch
;
2053 /* None found, create a new architecture from INFO, whose bfd_arch_info
2054 validity depends on the source:
2055 - executable useless
2056 - rs6000_host_arch() good
2058 - "set arch" trust blindly
2059 - GDB startup useless but harmless */
2061 if (!from_xcoff_exec
)
2063 arch
= info
.bfd_architecture
;
2064 mach
= info
.bfd_arch_info
->mach
;
2068 arch
= bfd_arch_powerpc
;
2070 bfd_default_set_arch_mach (&abfd
, arch
, mach
);
2071 info
.bfd_arch_info
= bfd_get_arch_info (&abfd
);
2073 tdep
= xmalloc (sizeof (struct gdbarch_tdep
));
2074 tdep
->wordsize
= wordsize
;
2075 tdep
->osabi
= osabi
;
2076 gdbarch
= gdbarch_alloc (&info
, tdep
);
2077 power
= arch
== bfd_arch_rs6000
;
2079 /* Select instruction printer. */
2080 tm_print_insn
= arch
== power
? print_insn_rs6000
:
2081 info
.byte_order
== BIG_ENDIAN
? print_insn_big_powerpc
:
2082 print_insn_little_powerpc
;
2084 /* Choose variant. */
2085 v
= find_variant_by_arch (arch
, mach
);
2087 v
= find_variant_by_name (power
? "power" : "powerpc");
2088 tdep
->regs
= v
->regs
;
2090 /* Calculate byte offsets in raw register array. */
2091 tdep
->regoff
= xmalloc (v
->nregs
* sizeof (int));
2092 for (i
= off
= 0; i
< v
->nregs
; i
++)
2094 tdep
->regoff
[i
] = off
;
2095 off
+= regsize (v
->regs
+ i
, wordsize
);
2098 set_gdbarch_read_pc (gdbarch
, generic_target_read_pc
);
2099 set_gdbarch_write_pc (gdbarch
, generic_target_write_pc
);
2100 set_gdbarch_read_fp (gdbarch
, generic_target_read_fp
);
2101 set_gdbarch_write_fp (gdbarch
, generic_target_write_fp
);
2102 set_gdbarch_read_sp (gdbarch
, generic_target_read_sp
);
2103 set_gdbarch_write_sp (gdbarch
, generic_target_write_sp
);
2105 set_gdbarch_num_regs (gdbarch
, v
->nregs
);
2106 set_gdbarch_sp_regnum (gdbarch
, 1);
2107 set_gdbarch_fp_regnum (gdbarch
, 1);
2108 set_gdbarch_pc_regnum (gdbarch
, 64);
2109 set_gdbarch_register_name (gdbarch
, rs6000_register_name
);
2110 set_gdbarch_register_size (gdbarch
, wordsize
);
2111 set_gdbarch_register_bytes (gdbarch
, off
);
2112 set_gdbarch_register_byte (gdbarch
, rs6000_register_byte
);
2113 set_gdbarch_register_raw_size (gdbarch
, rs6000_register_raw_size
);
2114 set_gdbarch_max_register_raw_size (gdbarch
, 8);
2115 set_gdbarch_register_virtual_size (gdbarch
, rs6000_register_virtual_size
);
2116 set_gdbarch_max_register_virtual_size (gdbarch
, 8);
2117 set_gdbarch_register_virtual_type (gdbarch
, rs6000_register_virtual_type
);
2119 set_gdbarch_ptr_bit (gdbarch
, wordsize
* TARGET_CHAR_BIT
);
2120 set_gdbarch_short_bit (gdbarch
, 2 * TARGET_CHAR_BIT
);
2121 set_gdbarch_int_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
2122 set_gdbarch_long_bit (gdbarch
, wordsize
* TARGET_CHAR_BIT
);
2123 set_gdbarch_long_long_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2124 set_gdbarch_float_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
2125 set_gdbarch_double_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2126 set_gdbarch_long_double_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2128 set_gdbarch_use_generic_dummy_frames (gdbarch
, 1);
2129 set_gdbarch_call_dummy_length (gdbarch
, 0);
2130 set_gdbarch_call_dummy_location (gdbarch
, AT_ENTRY_POINT
);
2131 set_gdbarch_call_dummy_address (gdbarch
, entry_point_address
);
2132 set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch
, 1);
2133 set_gdbarch_call_dummy_breakpoint_offset (gdbarch
, 0);
2134 set_gdbarch_call_dummy_start_offset (gdbarch
, 0);
2135 set_gdbarch_pc_in_call_dummy (gdbarch
, generic_pc_in_call_dummy
);
2136 set_gdbarch_call_dummy_p (gdbarch
, 1);
2137 set_gdbarch_call_dummy_stack_adjust_p (gdbarch
, 0);
2138 set_gdbarch_get_saved_register (gdbarch
, generic_get_saved_register
);
2139 set_gdbarch_fix_call_dummy (gdbarch
, rs6000_fix_call_dummy
);
2140 set_gdbarch_push_dummy_frame (gdbarch
, generic_push_dummy_frame
);
2141 set_gdbarch_save_dummy_frame_tos (gdbarch
, generic_save_dummy_frame_tos
);
2142 set_gdbarch_push_return_address (gdbarch
, ppc_push_return_address
);
2143 set_gdbarch_believe_pcc_promotion (gdbarch
, 1);
2144 set_gdbarch_coerce_float_to_double (gdbarch
, rs6000_coerce_float_to_double
);
2146 set_gdbarch_register_convertible (gdbarch
, rs6000_register_convertible
);
2147 set_gdbarch_register_convert_to_virtual (gdbarch
, rs6000_register_convert_to_virtual
);
2148 set_gdbarch_register_convert_to_raw (gdbarch
, rs6000_register_convert_to_raw
);
2150 set_gdbarch_extract_return_value (gdbarch
, rs6000_extract_return_value
);
2153 set_gdbarch_push_arguments (gdbarch
, ppc_sysv_abi_push_arguments
);
2155 set_gdbarch_push_arguments (gdbarch
, rs6000_push_arguments
);
2157 set_gdbarch_store_struct_return (gdbarch
, rs6000_store_struct_return
);
2158 set_gdbarch_store_return_value (gdbarch
, rs6000_store_return_value
);
2159 set_gdbarch_extract_struct_value_address (gdbarch
, rs6000_extract_struct_value_address
);
2160 set_gdbarch_use_struct_convention (gdbarch
, generic_use_struct_convention
);
2162 set_gdbarch_pop_frame (gdbarch
, rs6000_pop_frame
);
2164 set_gdbarch_skip_prologue (gdbarch
, rs6000_skip_prologue
);
2165 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
2166 set_gdbarch_decr_pc_after_break (gdbarch
, 0);
2167 set_gdbarch_function_start_offset (gdbarch
, 0);
2168 set_gdbarch_breakpoint_from_pc (gdbarch
, rs6000_breakpoint_from_pc
);
2170 /* Not sure on this. FIXMEmgo */
2171 set_gdbarch_frame_args_skip (gdbarch
, 8);
2173 set_gdbarch_frame_chain_valid (gdbarch
, file_frame_chain_valid
);
2174 if (osabi
== ELFOSABI_LINUX
)
2176 set_gdbarch_frameless_function_invocation (gdbarch
,
2177 ppc_linux_frameless_function_invocation
);
2178 set_gdbarch_frame_chain (gdbarch
, ppc_linux_frame_chain
);
2179 set_gdbarch_frame_saved_pc (gdbarch
, ppc_linux_frame_saved_pc
);
2181 set_gdbarch_frame_init_saved_regs (gdbarch
,
2182 ppc_linux_frame_init_saved_regs
);
2183 set_gdbarch_init_extra_frame_info (gdbarch
,
2184 ppc_linux_init_extra_frame_info
);
2186 set_gdbarch_memory_remove_breakpoint (gdbarch
,
2187 ppc_linux_memory_remove_breakpoint
);
2191 set_gdbarch_frameless_function_invocation (gdbarch
,
2192 rs6000_frameless_function_invocation
);
2193 set_gdbarch_frame_chain (gdbarch
, rs6000_frame_chain
);
2194 set_gdbarch_frame_saved_pc (gdbarch
, rs6000_frame_saved_pc
);
2196 set_gdbarch_frame_init_saved_regs (gdbarch
, rs6000_frame_init_saved_regs
);
2197 set_gdbarch_init_extra_frame_info (gdbarch
, rs6000_init_extra_frame_info
);
2199 /* Handle RS/6000 function pointers. */
2200 set_gdbarch_convert_from_func_ptr_addr (gdbarch
,
2201 rs6000_convert_from_func_ptr_addr
);
2203 set_gdbarch_frame_args_address (gdbarch
, rs6000_frame_args_address
);
2204 set_gdbarch_frame_locals_address (gdbarch
, rs6000_frame_args_address
);
2205 set_gdbarch_saved_pc_after_call (gdbarch
, rs6000_saved_pc_after_call
);
2207 /* We can't tell how many args there are
2208 now that the C compiler delays popping them. */
2209 set_gdbarch_frame_num_args (gdbarch
, frame_num_args_unknown
);
2214 /* Initialization code. */
2217 _initialize_rs6000_tdep (void)
2219 register_gdbarch_init (bfd_arch_rs6000
, rs6000_gdbarch_init
);
2220 register_gdbarch_init (bfd_arch_powerpc
, rs6000_gdbarch_init
);