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 "xcoffsolib.h"
32 #include "arch-utils.h"
34 #include "bfd/libbfd.h" /* for bfd_default_set_arch_mach */
35 #include "coff/internal.h" /* for libcoff.h */
36 #include "bfd/libcoff.h" /* for xcoff_data */
42 /* If the kernel has to deliver a signal, it pushes a sigcontext
43 structure on the stack and then calls the signal handler, passing
44 the address of the sigcontext in an argument register. Usually
45 the signal handler doesn't save this register, so we have to
46 access the sigcontext structure via an offset from the signal handler
48 The following constants were determined by experimentation on AIX 3.2. */
49 #define SIG_FRAME_PC_OFFSET 96
50 #define SIG_FRAME_LR_OFFSET 108
51 #define SIG_FRAME_FP_OFFSET 284
53 /* To be used by skip_prologue. */
55 struct rs6000_framedata
57 int offset
; /* total size of frame --- the distance
58 by which we decrement sp to allocate
60 int saved_gpr
; /* smallest # of saved gpr */
61 int saved_fpr
; /* smallest # of saved fpr */
62 int alloca_reg
; /* alloca register number (frame ptr) */
63 char frameless
; /* true if frameless functions. */
64 char nosavedpc
; /* true if pc not saved. */
65 int gpr_offset
; /* offset of saved gprs from prev sp */
66 int fpr_offset
; /* offset of saved fprs from prev sp */
67 int lr_offset
; /* offset of saved lr */
68 int cr_offset
; /* offset of saved cr */
71 /* Description of a single register. */
75 char *name
; /* name of register */
76 unsigned char sz32
; /* size on 32-bit arch, 0 if nonextant */
77 unsigned char sz64
; /* size on 64-bit arch, 0 if nonextant */
78 unsigned char fpr
; /* whether register is floating-point */
81 /* Private data that this module attaches to struct gdbarch. */
85 int wordsize
; /* size in bytes of fixed-point word */
86 int osabi
; /* OS / ABI from ELF header */
87 int *regoff
; /* byte offsets in register arrays */
88 const struct reg
*regs
; /* from current variant */
91 /* Return the current architecture's gdbarch_tdep structure. */
93 #define TDEP gdbarch_tdep (current_gdbarch)
95 /* Breakpoint shadows for the single step instructions will be kept here. */
97 static struct sstep_breaks
99 /* Address, or 0 if this is not in use. */
101 /* Shadow contents. */
106 /* Hook for determining the TOC address when calling functions in the
107 inferior under AIX. The initialization code in rs6000-nat.c sets
108 this hook to point to find_toc_address. */
110 CORE_ADDR (*rs6000_find_toc_address_hook
) (CORE_ADDR
) = NULL
;
112 /* Hook to set the current architecture when starting a child process.
113 rs6000-nat.c sets this. */
115 void (*rs6000_set_host_arch_hook
) (int) = NULL
;
117 /* Static function prototypes */
119 static CORE_ADDR
branch_dest (int opcode
, int instr
, CORE_ADDR pc
,
121 static CORE_ADDR
skip_prologue (CORE_ADDR
, CORE_ADDR
,
122 struct rs6000_framedata
*);
123 static void frame_get_saved_regs (struct frame_info
* fi
,
124 struct rs6000_framedata
* fdatap
);
125 static CORE_ADDR
frame_initial_stack_address (struct frame_info
*);
127 /* Read a LEN-byte address from debugged memory address MEMADDR. */
130 read_memory_addr (CORE_ADDR memaddr
, int len
)
132 return read_memory_unsigned_integer (memaddr
, len
);
136 rs6000_skip_prologue (CORE_ADDR pc
)
138 struct rs6000_framedata frame
;
139 pc
= skip_prologue (pc
, 0, &frame
);
144 /* Fill in fi->saved_regs */
146 struct frame_extra_info
148 /* Functions calling alloca() change the value of the stack
149 pointer. We need to use initial stack pointer (which is saved in
150 r31 by gcc) in such cases. If a compiler emits traceback table,
151 then we should use the alloca register specified in traceback
153 CORE_ADDR initial_sp
; /* initial stack pointer. */
157 rs6000_init_extra_frame_info (int fromleaf
, struct frame_info
*fi
)
159 fi
->extra_info
= (struct frame_extra_info
*)
160 frame_obstack_alloc (sizeof (struct frame_extra_info
));
161 fi
->extra_info
->initial_sp
= 0;
162 if (fi
->next
!= (CORE_ADDR
) 0
163 && fi
->pc
< TEXT_SEGMENT_BASE
)
164 /* We're in get_prev_frame */
165 /* and this is a special signal frame. */
166 /* (fi->pc will be some low address in the kernel, */
167 /* to which the signal handler returns). */
168 fi
->signal_handler_caller
= 1;
171 /* Put here the code to store, into a struct frame_saved_regs,
172 the addresses of the saved registers of frame described by FRAME_INFO.
173 This includes special registers such as pc and fp saved in special
174 ways in the stack frame. sp is even more special:
175 the address we return for it IS the sp for the next frame. */
177 /* In this implementation for RS/6000, we do *not* save sp. I am
178 not sure if it will be needed. The following function takes care of gpr's
182 rs6000_frame_init_saved_regs (struct frame_info
*fi
)
184 frame_get_saved_regs (fi
, NULL
);
188 rs6000_frame_args_address (struct frame_info
*fi
)
190 if (fi
->extra_info
->initial_sp
!= 0)
191 return fi
->extra_info
->initial_sp
;
193 return frame_initial_stack_address (fi
);
196 /* Immediately after a function call, return the saved pc.
197 Can't go through the frames for this because on some machines
198 the new frame is not set up until the new function executes
199 some instructions. */
202 rs6000_saved_pc_after_call (struct frame_info
*fi
)
204 return read_register (PPC_LR_REGNUM
);
207 /* Calculate the destination of a branch/jump. Return -1 if not a branch. */
210 branch_dest (int opcode
, int instr
, CORE_ADDR pc
, CORE_ADDR safety
)
217 absolute
= (int) ((instr
>> 1) & 1);
222 immediate
= ((instr
& ~3) << 6) >> 6; /* br unconditional */
226 dest
= pc
+ immediate
;
230 immediate
= ((instr
& ~3) << 16) >> 16; /* br conditional */
234 dest
= pc
+ immediate
;
238 ext_op
= (instr
>> 1) & 0x3ff;
240 if (ext_op
== 16) /* br conditional register */
242 dest
= read_register (PPC_LR_REGNUM
) & ~3;
244 /* If we are about to return from a signal handler, dest is
245 something like 0x3c90. The current frame is a signal handler
246 caller frame, upon completion of the sigreturn system call
247 execution will return to the saved PC in the frame. */
248 if (dest
< TEXT_SEGMENT_BASE
)
250 struct frame_info
*fi
;
252 fi
= get_current_frame ();
254 dest
= read_memory_addr (fi
->frame
+ SIG_FRAME_PC_OFFSET
,
259 else if (ext_op
== 528) /* br cond to count reg */
261 dest
= read_register (PPC_CTR_REGNUM
) & ~3;
263 /* If we are about to execute a system call, dest is something
264 like 0x22fc or 0x3b00. Upon completion the system call
265 will return to the address in the link register. */
266 if (dest
< TEXT_SEGMENT_BASE
)
267 dest
= read_register (PPC_LR_REGNUM
) & ~3;
276 return (dest
< TEXT_SEGMENT_BASE
) ? safety
: dest
;
280 /* Sequence of bytes for breakpoint instruction. */
282 #define BIG_BREAKPOINT { 0x7d, 0x82, 0x10, 0x08 }
283 #define LITTLE_BREAKPOINT { 0x08, 0x10, 0x82, 0x7d }
285 static unsigned char *
286 rs6000_breakpoint_from_pc (CORE_ADDR
*bp_addr
, int *bp_size
)
288 static unsigned char big_breakpoint
[] = BIG_BREAKPOINT
;
289 static unsigned char little_breakpoint
[] = LITTLE_BREAKPOINT
;
291 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
)
292 return big_breakpoint
;
294 return little_breakpoint
;
298 /* AIX does not support PT_STEP. Simulate it. */
301 rs6000_software_single_step (unsigned int signal
, int insert_breakpoints_p
)
303 #define INSNLEN(OPCODE) 4
305 static char le_breakp
[] = LITTLE_BREAKPOINT
;
306 static char be_breakp
[] = BIG_BREAKPOINT
;
307 char *breakp
= TARGET_BYTE_ORDER
== BIG_ENDIAN
? be_breakp
: le_breakp
;
313 if (insert_breakpoints_p
)
318 insn
= read_memory_integer (loc
, 4);
320 breaks
[0] = loc
+ INSNLEN (insn
);
322 breaks
[1] = branch_dest (opcode
, insn
, loc
, breaks
[0]);
324 /* Don't put two breakpoints on the same address. */
325 if (breaks
[1] == breaks
[0])
328 stepBreaks
[1].address
= 0;
330 for (ii
= 0; ii
< 2; ++ii
)
333 /* ignore invalid breakpoint. */
334 if (breaks
[ii
] == -1)
337 read_memory (breaks
[ii
], stepBreaks
[ii
].data
, 4);
339 write_memory (breaks
[ii
], breakp
, 4);
340 stepBreaks
[ii
].address
= breaks
[ii
];
347 /* remove step breakpoints. */
348 for (ii
= 0; ii
< 2; ++ii
)
349 if (stepBreaks
[ii
].address
!= 0)
351 (stepBreaks
[ii
].address
, stepBreaks
[ii
].data
, 4);
354 errno
= 0; /* FIXME, don't ignore errors! */
355 /* What errors? {read,write}_memory call error(). */
359 /* return pc value after skipping a function prologue and also return
360 information about a function frame.
362 in struct rs6000_framedata fdata:
363 - frameless is TRUE, if function does not have a frame.
364 - nosavedpc is TRUE, if function does not save %pc value in its frame.
365 - offset is the initial size of this stack frame --- the amount by
366 which we decrement the sp to allocate the frame.
367 - saved_gpr is the number of the first saved gpr.
368 - saved_fpr is the number of the first saved fpr.
369 - alloca_reg is the number of the register used for alloca() handling.
371 - gpr_offset is the offset of the first saved gpr from the previous frame.
372 - fpr_offset is the offset of the first saved fpr from the previous frame.
373 - lr_offset is the offset of the saved lr
374 - cr_offset is the offset of the saved cr
377 #define SIGNED_SHORT(x) \
378 ((sizeof (short) == 2) \
379 ? ((int)(short)(x)) \
380 : ((int)((((x) & 0xffff) ^ 0x8000) - 0x8000)))
382 #define GET_SRC_REG(x) (((x) >> 21) & 0x1f)
385 skip_prologue (CORE_ADDR pc
, CORE_ADDR lim_pc
, struct rs6000_framedata
*fdata
)
387 CORE_ADDR orig_pc
= pc
;
388 CORE_ADDR last_prologue_pc
;
396 int minimal_toc_loaded
= 0;
397 int prev_insn_was_prologue_insn
= 1;
399 memset (fdata
, 0, sizeof (struct rs6000_framedata
));
400 fdata
->saved_gpr
= -1;
401 fdata
->saved_fpr
= -1;
402 fdata
->alloca_reg
= -1;
403 fdata
->frameless
= 1;
404 fdata
->nosavedpc
= 1;
407 while (lim_pc
== 0 || pc
< lim_pc
- 4)
411 /* Sometimes it isn't clear if an instruction is a prologue
412 instruction or not. When we encounter one of these ambiguous
413 cases, we'll set prev_insn_was_prologue_insn to 0 (false).
414 Otherwise, we'll assume that it really is a prologue instruction. */
415 if (prev_insn_was_prologue_insn
)
416 last_prologue_pc
= pc
;
417 prev_insn_was_prologue_insn
= 1;
419 if (target_read_memory (pc
, buf
, 4))
421 op
= extract_signed_integer (buf
, 4);
423 if ((op
& 0xfc1fffff) == 0x7c0802a6)
425 lr_reg
= (op
& 0x03e00000) | 0x90010000;
429 else if ((op
& 0xfc1fffff) == 0x7c000026)
431 cr_reg
= (op
& 0x03e00000) | 0x90010000;
435 else if ((op
& 0xfc1f0000) == 0xd8010000)
436 { /* stfd Rx,NUM(r1) */
437 reg
= GET_SRC_REG (op
);
438 if (fdata
->saved_fpr
== -1 || fdata
->saved_fpr
> reg
)
440 fdata
->saved_fpr
= reg
;
441 fdata
->fpr_offset
= SIGNED_SHORT (op
) + offset
;
446 else if (((op
& 0xfc1f0000) == 0xbc010000) || /* stm Rx, NUM(r1) */
447 (((op
& 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
448 (op
& 0xfc1f0003) == 0xf8010000) && /* std rx,NUM(r1) */
449 (op
& 0x03e00000) >= 0x01a00000)) /* rx >= r13 */
452 reg
= GET_SRC_REG (op
);
453 if (fdata
->saved_gpr
== -1 || fdata
->saved_gpr
> reg
)
455 fdata
->saved_gpr
= reg
;
456 if ((op
& 0xfc1f0003) == 0xf8010000)
458 fdata
->gpr_offset
= SIGNED_SHORT (op
) + offset
;
463 else if ((op
& 0xffff0000) == 0x60000000)
466 /* Allow nops in the prologue, but do not consider them to
467 be part of the prologue unless followed by other prologue
469 prev_insn_was_prologue_insn
= 0;
473 else if ((op
& 0xffff0000) == 0x3c000000)
474 { /* addis 0,0,NUM, used
476 fdata
->offset
= (op
& 0x0000ffff) << 16;
477 fdata
->frameless
= 0;
481 else if ((op
& 0xffff0000) == 0x60000000)
482 { /* ori 0,0,NUM, 2nd ha
483 lf of >= 32k frames */
484 fdata
->offset
|= (op
& 0x0000ffff);
485 fdata
->frameless
= 0;
489 else if (lr_reg
!= -1 && (op
& 0xffff0000) == lr_reg
)
492 fdata
->lr_offset
= SIGNED_SHORT (op
) + offset
;
493 fdata
->nosavedpc
= 0;
498 else if (cr_reg
!= -1 && (op
& 0xffff0000) == cr_reg
)
501 fdata
->cr_offset
= SIGNED_SHORT (op
) + offset
;
506 else if (op
== 0x48000005)
512 else if (op
== 0x48000004)
517 else if (((op
& 0xffff0000) == 0x801e0000 || /* lwz 0,NUM(r30), used
518 in V.4 -mrelocatable */
519 op
== 0x7fc0f214) && /* add r30,r0,r30, used
520 in V.4 -mrelocatable */
521 lr_reg
== 0x901e0000)
526 else if ((op
& 0xffff0000) == 0x3fc00000 || /* addis 30,0,foo@ha, used
527 in V.4 -mminimal-toc */
528 (op
& 0xffff0000) == 0x3bde0000)
529 { /* addi 30,30,foo@l */
533 else if ((op
& 0xfc000001) == 0x48000001)
537 fdata
->frameless
= 0;
538 /* Don't skip over the subroutine call if it is not within the first
539 three instructions of the prologue. */
540 if ((pc
- orig_pc
) > 8)
543 op
= read_memory_integer (pc
+ 4, 4);
545 /* At this point, make sure this is not a trampoline function
546 (a function that simply calls another functions, and nothing else).
547 If the next is not a nop, this branch was part of the function
550 if (op
== 0x4def7b82 || op
== 0) /* crorc 15, 15, 15 */
551 break; /* don't skip over
555 /* update stack pointer */
557 else if ((op
& 0xffff0000) == 0x94210000 || /* stu r1,NUM(r1) */
558 (op
& 0xffff0003) == 0xf8210001) /* stdu r1,NUM(r1) */
560 fdata
->frameless
= 0;
561 if ((op
& 0xffff0003) == 0xf8210001)
563 fdata
->offset
= SIGNED_SHORT (op
);
564 offset
= fdata
->offset
;
568 else if (op
== 0x7c21016e)
570 fdata
->frameless
= 0;
571 offset
= fdata
->offset
;
574 /* Load up minimal toc pointer */
576 else if ((op
>> 22) == 0x20f
577 && !minimal_toc_loaded
)
578 { /* l r31,... or l r30,... */
579 minimal_toc_loaded
= 1;
582 /* move parameters from argument registers to local variable
585 else if ((op
& 0xfc0007fe) == 0x7c000378 && /* mr(.) Rx,Ry */
586 (((op
>> 21) & 31) >= 3) && /* R3 >= Ry >= R10 */
587 (((op
>> 21) & 31) <= 10) &&
588 (((op
>> 16) & 31) >= fdata
->saved_gpr
)) /* Rx: local var reg */
592 /* store parameters in stack */
594 else if ((op
& 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
595 (op
& 0xfc1f0003) == 0xf8010000 || /* std rx,NUM(r1) */
596 (op
& 0xfc1f0000) == 0xd8010000 || /* stfd Rx,NUM(r1) */
597 (op
& 0xfc1f0000) == 0xfc010000) /* frsp, fp?,NUM(r1) */
601 /* store parameters in stack via frame pointer */
604 ((op
& 0xfc1f0000) == 0x901f0000 || /* st rx,NUM(r1) */
605 (op
& 0xfc1f0000) == 0xd81f0000 || /* stfd Rx,NUM(r1) */
606 (op
& 0xfc1f0000) == 0xfc1f0000))
607 { /* frsp, fp?,NUM(r1) */
610 /* Set up frame pointer */
612 else if (op
== 0x603f0000 /* oril r31, r1, 0x0 */
615 fdata
->frameless
= 0;
617 fdata
->alloca_reg
= 31;
620 /* Another way to set up the frame pointer. */
622 else if ((op
& 0xfc1fffff) == 0x38010000)
623 { /* addi rX, r1, 0x0 */
624 fdata
->frameless
= 0;
626 fdata
->alloca_reg
= (op
& ~0x38010000) >> 21;
637 /* I have problems with skipping over __main() that I need to address
638 * sometime. Previously, I used to use misc_function_vector which
639 * didn't work as well as I wanted to be. -MGO */
641 /* If the first thing after skipping a prolog is a branch to a function,
642 this might be a call to an initializer in main(), introduced by gcc2.
643 We'd like to skip over it as well. Fortunately, xlc does some extra
644 work before calling a function right after a prologue, thus we can
645 single out such gcc2 behaviour. */
648 if ((op
& 0xfc000001) == 0x48000001)
649 { /* bl foo, an initializer function? */
650 op
= read_memory_integer (pc
+ 4, 4);
652 if (op
== 0x4def7b82)
653 { /* cror 0xf, 0xf, 0xf (nop) */
655 /* check and see if we are in main. If so, skip over this initializer
658 tmp
= find_pc_misc_function (pc
);
659 if (tmp
>= 0 && STREQ (misc_function_vector
[tmp
].name
, "main"))
665 fdata
->offset
= -fdata
->offset
;
666 return last_prologue_pc
;
670 /*************************************************************************
671 Support for creating pushing a dummy frame into the stack, and popping
673 *************************************************************************/
676 /* Pop the innermost frame, go back to the caller. */
679 rs6000_pop_frame (void)
681 CORE_ADDR pc
, lr
, sp
, prev_sp
, addr
; /* %pc, %lr, %sp */
682 struct rs6000_framedata fdata
;
683 struct frame_info
*frame
= get_current_frame ();
687 sp
= FRAME_FP (frame
);
689 if (PC_IN_CALL_DUMMY (frame
->pc
, frame
->frame
, frame
->frame
))
691 generic_pop_dummy_frame ();
692 flush_cached_frames ();
696 /* Make sure that all registers are valid. */
697 read_register_bytes (0, NULL
, REGISTER_BYTES
);
699 /* figure out previous %pc value. If the function is frameless, it is
700 still in the link register, otherwise walk the frames and retrieve the
701 saved %pc value in the previous frame. */
703 addr
= get_pc_function_start (frame
->pc
);
704 (void) skip_prologue (addr
, frame
->pc
, &fdata
);
706 wordsize
= TDEP
->wordsize
;
710 prev_sp
= read_memory_addr (sp
, wordsize
);
711 if (fdata
.lr_offset
== 0)
712 lr
= read_register (PPC_LR_REGNUM
);
714 lr
= read_memory_addr (prev_sp
+ fdata
.lr_offset
, wordsize
);
716 /* reset %pc value. */
717 write_register (PC_REGNUM
, lr
);
719 /* reset register values if any was saved earlier. */
721 if (fdata
.saved_gpr
!= -1)
723 addr
= prev_sp
+ fdata
.gpr_offset
;
724 for (ii
= fdata
.saved_gpr
; ii
<= 31; ++ii
)
726 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
)], wordsize
);
731 if (fdata
.saved_fpr
!= -1)
733 addr
= prev_sp
+ fdata
.fpr_offset
;
734 for (ii
= fdata
.saved_fpr
; ii
<= 31; ++ii
)
736 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
+ FP0_REGNUM
)], 8);
741 write_register (SP_REGNUM
, prev_sp
);
742 target_store_registers (-1);
743 flush_cached_frames ();
746 /* Fixup the call sequence of a dummy function, with the real function
747 address. Its arguments will be passed by gdb. */
750 rs6000_fix_call_dummy (char *dummyname
, CORE_ADDR pc
, CORE_ADDR fun
,
751 int nargs
, value_ptr
*args
, struct type
*type
,
754 #define TOC_ADDR_OFFSET 20
755 #define TARGET_ADDR_OFFSET 28
758 CORE_ADDR target_addr
;
760 if (rs6000_find_toc_address_hook
!= NULL
)
762 CORE_ADDR tocvalue
= (*rs6000_find_toc_address_hook
) (fun
);
763 write_register (PPC_TOC_REGNUM
, tocvalue
);
767 /* Pass the arguments in either registers, or in the stack. In RS/6000,
768 the first eight words of the argument list (that might be less than
769 eight parameters if some parameters occupy more than one word) are
770 passed in r3..r10 registers. float and double parameters are
771 passed in fpr's, in addition to that. Rest of the parameters if any
772 are passed in user stack. There might be cases in which half of the
773 parameter is copied into registers, the other half is pushed into
776 Stack must be aligned on 64-bit boundaries when synthesizing
779 If the function is returning a structure, then the return address is passed
780 in r3, then the first 7 words of the parameters can be passed in registers,
784 rs6000_push_arguments (int nargs
, value_ptr
*args
, CORE_ADDR sp
,
785 int struct_return
, CORE_ADDR struct_addr
)
789 int argno
; /* current argument number */
790 int argbytes
; /* current argument byte */
792 int f_argno
= 0; /* current floating point argno */
793 int wordsize
= TDEP
->wordsize
;
800 /* The first eight words of ther arguments are passed in registers. Copy
803 If the function is returning a `struct', then the first word (which
804 will be passed in r3) is used for struct return address. In that
805 case we should advance one word and start from r4 register to copy
808 ii
= struct_return
? 1 : 0;
811 effectively indirect call... gcc does...
813 return_val example( float, int);
816 float in fp0, int in r3
817 offset of stack on overflow 8/16
818 for varargs, must go by type.
820 float in r3&r4, int in r5
821 offset of stack on overflow different
823 return in r3 or f0. If no float, must study how gcc emulates floats;
824 pay attention to arg promotion.
825 User may have to cast\args to handle promotion correctly
826 since gdb won't know if prototype supplied or not.
829 for (argno
= 0, argbytes
= 0; argno
< nargs
&& ii
< 8; ++ii
)
831 int reg_size
= REGISTER_RAW_SIZE (ii
+ 3);
834 type
= check_typedef (VALUE_TYPE (arg
));
835 len
= TYPE_LENGTH (type
);
837 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
840 /* floating point arguments are passed in fpr's, as well as gpr's.
841 There are 13 fpr's reserved for passing parameters. At this point
842 there is no way we would run out of them. */
846 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
848 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
+ 1 + f_argno
)],
849 VALUE_CONTENTS (arg
),
857 /* Argument takes more than one register. */
858 while (argbytes
< len
)
860 memset (®isters
[REGISTER_BYTE (ii
+ 3)], 0, reg_size
);
861 memcpy (®isters
[REGISTER_BYTE (ii
+ 3)],
862 ((char *) VALUE_CONTENTS (arg
)) + argbytes
,
863 (len
- argbytes
) > reg_size
864 ? reg_size
: len
- argbytes
);
865 ++ii
, argbytes
+= reg_size
;
868 goto ran_out_of_registers_for_arguments
;
874 { /* Argument can fit in one register. No problem. */
875 int adj
= TARGET_BYTE_ORDER
== BIG_ENDIAN
? reg_size
- len
: 0;
876 memset (®isters
[REGISTER_BYTE (ii
+ 3)], 0, reg_size
);
877 memcpy ((char *)®isters
[REGISTER_BYTE (ii
+ 3)] + adj
,
878 VALUE_CONTENTS (arg
), len
);
883 ran_out_of_registers_for_arguments
:
885 saved_sp
= read_sp ();
886 #ifndef ELF_OBJECT_FORMAT
887 /* location for 8 parameters are always reserved. */
890 /* another six words for back chain, TOC register, link register, etc. */
893 /* stack pointer must be quadword aligned */
897 /* if there are more arguments, allocate space for them in
898 the stack, then push them starting from the ninth one. */
900 if ((argno
< nargs
) || argbytes
)
906 space
+= ((len
- argbytes
+ 3) & -4);
912 for (; jj
< nargs
; ++jj
)
914 value_ptr val
= args
[jj
];
915 space
+= ((TYPE_LENGTH (VALUE_TYPE (val
))) + 3) & -4;
918 /* add location required for the rest of the parameters */
919 space
= (space
+ 15) & -16;
922 /* This is another instance we need to be concerned about securing our
923 stack space. If we write anything underneath %sp (r1), we might conflict
924 with the kernel who thinks he is free to use this area. So, update %sp
925 first before doing anything else. */
927 write_register (SP_REGNUM
, sp
);
929 /* if the last argument copied into the registers didn't fit there
930 completely, push the rest of it into stack. */
934 write_memory (sp
+ 24 + (ii
* 4),
935 ((char *) VALUE_CONTENTS (arg
)) + argbytes
,
938 ii
+= ((len
- argbytes
+ 3) & -4) / 4;
941 /* push the rest of the arguments into stack. */
942 for (; argno
< nargs
; ++argno
)
946 type
= check_typedef (VALUE_TYPE (arg
));
947 len
= TYPE_LENGTH (type
);
950 /* float types should be passed in fpr's, as well as in the stack. */
951 if (TYPE_CODE (type
) == TYPE_CODE_FLT
&& f_argno
< 13)
956 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
958 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
+ 1 + f_argno
)],
959 VALUE_CONTENTS (arg
),
964 write_memory (sp
+ 24 + (ii
* 4), (char *) VALUE_CONTENTS (arg
), len
);
965 ii
+= ((len
+ 3) & -4) / 4;
969 /* Secure stack areas first, before doing anything else. */
970 write_register (SP_REGNUM
, sp
);
972 /* set back chain properly */
973 store_address (tmp_buffer
, 4, saved_sp
);
974 write_memory (sp
, tmp_buffer
, 4);
976 target_store_registers (-1);
980 /* Function: ppc_push_return_address (pc, sp)
981 Set up the return address for the inferior function call. */
984 ppc_push_return_address (CORE_ADDR pc
, CORE_ADDR sp
)
986 write_register (PPC_LR_REGNUM
, CALL_DUMMY_ADDRESS ());
990 /* Extract a function return value of type TYPE from raw register array
991 REGBUF, and copy that return value into VALBUF in virtual format. */
994 rs6000_extract_return_value (struct type
*valtype
, char *regbuf
, char *valbuf
)
998 if (TYPE_CODE (valtype
) == TYPE_CODE_FLT
)
1003 /* floats and doubles are returned in fpr1. fpr's have a size of 8 bytes.
1004 We need to truncate the return value into float size (4 byte) if
1007 if (TYPE_LENGTH (valtype
) > 4) /* this is a double */
1009 ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)],
1010 TYPE_LENGTH (valtype
));
1013 memcpy (&dd
, ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)], 8);
1015 memcpy (valbuf
, &ff
, sizeof (float));
1020 /* return value is copied starting from r3. */
1021 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
1022 && TYPE_LENGTH (valtype
) < REGISTER_RAW_SIZE (3))
1023 offset
= REGISTER_RAW_SIZE (3) - TYPE_LENGTH (valtype
);
1026 regbuf
+ REGISTER_BYTE (3) + offset
,
1027 TYPE_LENGTH (valtype
));
1031 /* Keep structure return address in this variable.
1032 FIXME: This is a horrid kludge which should not be allowed to continue
1033 living. This only allows a single nested call to a structure-returning
1034 function. Come on, guys! -- gnu@cygnus.com, Aug 92 */
1036 static CORE_ADDR rs6000_struct_return_address
;
1038 /* Indirect function calls use a piece of trampoline code to do context
1039 switching, i.e. to set the new TOC table. Skip such code if we are on
1040 its first instruction (as when we have single-stepped to here).
1041 Also skip shared library trampoline code (which is different from
1042 indirect function call trampolines).
1043 Result is desired PC to step until, or NULL if we are not in
1047 rs6000_skip_trampoline_code (CORE_ADDR pc
)
1049 register unsigned int ii
, op
;
1050 CORE_ADDR solib_target_pc
;
1052 static unsigned trampoline_code
[] =
1054 0x800b0000, /* l r0,0x0(r11) */
1055 0x90410014, /* st r2,0x14(r1) */
1056 0x7c0903a6, /* mtctr r0 */
1057 0x804b0004, /* l r2,0x4(r11) */
1058 0x816b0008, /* l r11,0x8(r11) */
1059 0x4e800420, /* bctr */
1060 0x4e800020, /* br */
1064 /* If pc is in a shared library trampoline, return its target. */
1065 solib_target_pc
= find_solib_trampoline_target (pc
);
1066 if (solib_target_pc
)
1067 return solib_target_pc
;
1069 for (ii
= 0; trampoline_code
[ii
]; ++ii
)
1071 op
= read_memory_integer (pc
+ (ii
* 4), 4);
1072 if (op
!= trampoline_code
[ii
])
1075 ii
= read_register (11); /* r11 holds destination addr */
1076 pc
= read_memory_addr (ii
, TDEP
->wordsize
); /* (r11) value */
1080 /* Determines whether the function FI has a frame on the stack or not. */
1083 rs6000_frameless_function_invocation (struct frame_info
*fi
)
1085 CORE_ADDR func_start
;
1086 struct rs6000_framedata fdata
;
1088 /* Don't even think about framelessness except on the innermost frame
1089 or if the function was interrupted by a signal. */
1090 if (fi
->next
!= NULL
&& !fi
->next
->signal_handler_caller
)
1093 func_start
= get_pc_function_start (fi
->pc
);
1095 /* If we failed to find the start of the function, it is a mistake
1096 to inspect the instructions. */
1100 /* A frame with a zero PC is usually created by dereferencing a NULL
1101 function pointer, normally causing an immediate core dump of the
1102 inferior. Mark function as frameless, as the inferior has no chance
1103 of setting up a stack frame. */
1110 (void) skip_prologue (func_start
, fi
->pc
, &fdata
);
1111 return fdata
.frameless
;
1114 /* Return the PC saved in a frame */
1117 rs6000_frame_saved_pc (struct frame_info
*fi
)
1119 CORE_ADDR func_start
;
1120 struct rs6000_framedata fdata
;
1121 int wordsize
= TDEP
->wordsize
;
1123 if (fi
->signal_handler_caller
)
1124 return read_memory_addr (fi
->frame
+ SIG_FRAME_PC_OFFSET
, wordsize
);
1126 if (PC_IN_CALL_DUMMY (fi
->pc
, fi
->frame
, fi
->frame
))
1127 return generic_read_register_dummy (fi
->pc
, fi
->frame
, PC_REGNUM
);
1129 func_start
= get_pc_function_start (fi
->pc
);
1131 /* If we failed to find the start of the function, it is a mistake
1132 to inspect the instructions. */
1136 (void) skip_prologue (func_start
, fi
->pc
, &fdata
);
1138 if (fdata
.lr_offset
== 0 && fi
->next
!= NULL
)
1140 if (fi
->next
->signal_handler_caller
)
1141 return read_memory_addr (fi
->next
->frame
+ SIG_FRAME_LR_OFFSET
,
1144 return read_memory_addr (FRAME_CHAIN (fi
) + DEFAULT_LR_SAVE
,
1148 if (fdata
.lr_offset
== 0)
1149 return read_register (PPC_LR_REGNUM
);
1151 return read_memory_addr (FRAME_CHAIN (fi
) + fdata
.lr_offset
, wordsize
);
1154 /* If saved registers of frame FI are not known yet, read and cache them.
1155 &FDATAP contains rs6000_framedata; TDATAP can be NULL,
1156 in which case the framedata are read. */
1159 frame_get_saved_regs (struct frame_info
*fi
, struct rs6000_framedata
*fdatap
)
1161 CORE_ADDR frame_addr
;
1162 struct rs6000_framedata work_fdata
;
1163 int wordsize
= TDEP
->wordsize
;
1170 fdatap
= &work_fdata
;
1171 (void) skip_prologue (get_pc_function_start (fi
->pc
), fi
->pc
, fdatap
);
1174 frame_saved_regs_zalloc (fi
);
1176 /* If there were any saved registers, figure out parent's stack
1178 /* The following is true only if the frame doesn't have a call to
1181 if (fdatap
->saved_fpr
== 0 && fdatap
->saved_gpr
== 0
1182 && fdatap
->lr_offset
== 0 && fdatap
->cr_offset
== 0)
1184 else if (fi
->prev
&& fi
->prev
->frame
)
1185 frame_addr
= fi
->prev
->frame
;
1187 frame_addr
= read_memory_addr (fi
->frame
, wordsize
);
1189 /* if != -1, fdatap->saved_fpr is the smallest number of saved_fpr.
1190 All fpr's from saved_fpr to fp31 are saved. */
1192 if (fdatap
->saved_fpr
>= 0)
1195 CORE_ADDR fpr_addr
= frame_addr
+ fdatap
->fpr_offset
;
1196 for (i
= fdatap
->saved_fpr
; i
< 32; i
++)
1198 fi
->saved_regs
[FP0_REGNUM
+ i
] = fpr_addr
;
1203 /* if != -1, fdatap->saved_gpr is the smallest number of saved_gpr.
1204 All gpr's from saved_gpr to gpr31 are saved. */
1206 if (fdatap
->saved_gpr
>= 0)
1209 CORE_ADDR gpr_addr
= frame_addr
+ fdatap
->gpr_offset
;
1210 for (i
= fdatap
->saved_gpr
; i
< 32; i
++)
1212 fi
->saved_regs
[i
] = gpr_addr
;
1213 gpr_addr
+= wordsize
;
1217 /* If != 0, fdatap->cr_offset is the offset from the frame that holds
1219 if (fdatap
->cr_offset
!= 0)
1220 fi
->saved_regs
[PPC_CR_REGNUM
] = frame_addr
+ fdatap
->cr_offset
;
1222 /* If != 0, fdatap->lr_offset is the offset from the frame that holds
1224 if (fdatap
->lr_offset
!= 0)
1225 fi
->saved_regs
[PPC_LR_REGNUM
] = frame_addr
+ fdatap
->lr_offset
;
1228 /* Return the address of a frame. This is the inital %sp value when the frame
1229 was first allocated. For functions calling alloca(), it might be saved in
1230 an alloca register. */
1233 frame_initial_stack_address (struct frame_info
*fi
)
1236 struct rs6000_framedata fdata
;
1237 struct frame_info
*callee_fi
;
1239 /* if the initial stack pointer (frame address) of this frame is known,
1242 if (fi
->extra_info
->initial_sp
)
1243 return fi
->extra_info
->initial_sp
;
1245 /* find out if this function is using an alloca register.. */
1247 (void) skip_prologue (get_pc_function_start (fi
->pc
), fi
->pc
, &fdata
);
1249 /* if saved registers of this frame are not known yet, read and cache them. */
1251 if (!fi
->saved_regs
)
1252 frame_get_saved_regs (fi
, &fdata
);
1254 /* If no alloca register used, then fi->frame is the value of the %sp for
1255 this frame, and it is good enough. */
1257 if (fdata
.alloca_reg
< 0)
1259 fi
->extra_info
->initial_sp
= fi
->frame
;
1260 return fi
->extra_info
->initial_sp
;
1263 /* This function has an alloca register. If this is the top-most frame
1264 (with the lowest address), the value in alloca register is good. */
1267 return fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1269 /* Otherwise, this is a caller frame. Callee has usually already saved
1270 registers, but there are exceptions (such as when the callee
1271 has no parameters). Find the address in which caller's alloca
1272 register is saved. */
1274 for (callee_fi
= fi
->next
; callee_fi
; callee_fi
= callee_fi
->next
)
1277 if (!callee_fi
->saved_regs
)
1278 frame_get_saved_regs (callee_fi
, NULL
);
1280 /* this is the address in which alloca register is saved. */
1282 tmpaddr
= callee_fi
->saved_regs
[fdata
.alloca_reg
];
1285 fi
->extra_info
->initial_sp
=
1286 read_memory_addr (tmpaddr
, TDEP
->wordsize
);
1287 return fi
->extra_info
->initial_sp
;
1290 /* Go look into deeper levels of the frame chain to see if any one of
1291 the callees has saved alloca register. */
1294 /* If alloca register was not saved, by the callee (or any of its callees)
1295 then the value in the register is still good. */
1297 fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1298 return fi
->extra_info
->initial_sp
;
1301 /* Describe the pointer in each stack frame to the previous stack frame
1304 /* FRAME_CHAIN takes a frame's nominal address
1305 and produces the frame's chain-pointer. */
1307 /* In the case of the RS/6000, the frame's nominal address
1308 is the address of a 4-byte word containing the calling frame's address. */
1311 rs6000_frame_chain (struct frame_info
*thisframe
)
1313 CORE_ADDR fp
, fpp
, lr
;
1314 int wordsize
= TDEP
->wordsize
;
1316 if (PC_IN_CALL_DUMMY (thisframe
->pc
, thisframe
->frame
, thisframe
->frame
))
1317 return thisframe
->frame
; /* dummy frame same as caller's frame */
1319 if (inside_entry_file (thisframe
->pc
) ||
1320 thisframe
->pc
== entry_point_address ())
1323 if (thisframe
->signal_handler_caller
)
1324 fp
= read_memory_addr (thisframe
->frame
+ SIG_FRAME_FP_OFFSET
,
1326 else if (thisframe
->next
!= NULL
1327 && thisframe
->next
->signal_handler_caller
1328 && FRAMELESS_FUNCTION_INVOCATION (thisframe
))
1329 /* A frameless function interrupted by a signal did not change the
1331 fp
= FRAME_FP (thisframe
);
1333 fp
= read_memory_addr ((thisframe
)->frame
, wordsize
);
1335 lr
= read_register (PPC_LR_REGNUM
);
1336 if (lr
== entry_point_address ())
1337 if (fp
!= 0 && (fpp
= read_memory_addr (fp
, wordsize
)) != 0)
1338 if (PC_IN_CALL_DUMMY (lr
, fpp
, fpp
))
1344 /* Return the size of register REG when words are WORDSIZE bytes long. If REG
1345 isn't available with that word size, return 0. */
1348 regsize (const struct reg
*reg
, int wordsize
)
1350 return wordsize
== 8 ? reg
->sz64
: reg
->sz32
;
1353 /* Return the name of register number N, or null if no such register exists
1354 in the current architecture. */
1357 rs6000_register_name (int n
)
1359 struct gdbarch_tdep
*tdep
= TDEP
;
1360 const struct reg
*reg
= tdep
->regs
+ n
;
1362 if (!regsize (reg
, tdep
->wordsize
))
1367 /* Index within `registers' of the first byte of the space for
1371 rs6000_register_byte (int n
)
1373 return TDEP
->regoff
[n
];
1376 /* Return the number of bytes of storage in the actual machine representation
1377 for register N if that register is available, else return 0. */
1380 rs6000_register_raw_size (int n
)
1382 struct gdbarch_tdep
*tdep
= TDEP
;
1383 const struct reg
*reg
= tdep
->regs
+ n
;
1384 return regsize (reg
, tdep
->wordsize
);
1387 /* Number of bytes of storage in the program's representation
1391 rs6000_register_virtual_size (int n
)
1393 return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (n
));
1396 /* Return the GDB type object for the "standard" data type
1397 of data in register N. */
1399 static struct type
*
1400 rs6000_register_virtual_type (int n
)
1402 struct gdbarch_tdep
*tdep
= TDEP
;
1403 const struct reg
*reg
= tdep
->regs
+ n
;
1405 return reg
->fpr
? builtin_type_double
:
1406 regsize (reg
, tdep
->wordsize
) == 8 ? builtin_type_int64
:
1410 /* For the PowerPC, it appears that the debug info marks float parameters as
1411 floats regardless of whether the function is prototyped, but the actual
1412 values are always passed in as doubles. Tell gdb to always assume that
1413 floats are passed as doubles and then converted in the callee. */
1416 rs6000_coerce_float_to_double (struct type
*formal
, struct type
*actual
)
1421 /* Return whether register N requires conversion when moving from raw format
1424 The register format for RS/6000 floating point registers is always
1425 double, we need a conversion if the memory format is float. */
1428 rs6000_register_convertible (int n
)
1430 const struct reg
*reg
= TDEP
->regs
+ n
;
1434 /* Convert data from raw format for register N in buffer FROM
1435 to virtual format with type TYPE in buffer TO. */
1438 rs6000_register_convert_to_virtual (int n
, struct type
*type
,
1439 char *from
, char *to
)
1441 if (TYPE_LENGTH (type
) != REGISTER_RAW_SIZE (n
))
1443 double val
= extract_floating (from
, REGISTER_RAW_SIZE (n
));
1444 store_floating (to
, TYPE_LENGTH (type
), val
);
1447 memcpy (to
, from
, REGISTER_RAW_SIZE (n
));
1450 /* Convert data from virtual format with type TYPE in buffer FROM
1451 to raw format for register N in buffer TO. */
1454 rs6000_register_convert_to_raw (struct type
*type
, int n
,
1455 char *from
, char *to
)
1457 if (TYPE_LENGTH (type
) != REGISTER_RAW_SIZE (n
))
1459 double val
= extract_floating (from
, TYPE_LENGTH (type
));
1460 store_floating (to
, REGISTER_RAW_SIZE (n
), val
);
1463 memcpy (to
, from
, REGISTER_RAW_SIZE (n
));
1466 /* Store the address of the place in which to copy the structure the
1467 subroutine will return. This is called from call_function.
1469 In RS/6000, struct return addresses are passed as an extra parameter in r3.
1470 In function return, callee is not responsible of returning this address
1471 back. Since gdb needs to find it, we will store in a designated variable
1472 `rs6000_struct_return_address'. */
1475 rs6000_store_struct_return (CORE_ADDR addr
, CORE_ADDR sp
)
1477 write_register (3, addr
);
1478 rs6000_struct_return_address
= addr
;
1481 /* Write into appropriate registers a function return value
1482 of type TYPE, given in virtual format. */
1485 rs6000_store_return_value (struct type
*type
, char *valbuf
)
1487 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
1489 /* Floating point values are returned starting from FPR1 and up.
1490 Say a double_double_double type could be returned in
1491 FPR1/FPR2/FPR3 triple. */
1493 write_register_bytes (REGISTER_BYTE (FP0_REGNUM
+ 1), valbuf
,
1494 TYPE_LENGTH (type
));
1496 /* Everything else is returned in GPR3 and up. */
1497 write_register_bytes (REGISTER_BYTE (PPC_GP0_REGNUM
+ 3), valbuf
,
1498 TYPE_LENGTH (type
));
1501 /* Extract from an array REGBUF containing the (raw) register state
1502 the address in which a function should return its structure value,
1503 as a CORE_ADDR (or an expression that can be used as one). */
1506 rs6000_extract_struct_value_address (char *regbuf
)
1508 return rs6000_struct_return_address
;
1511 /* Return whether PC is in a dummy function call.
1513 FIXME: This just checks for the end of the stack, which is broken
1514 for things like stepping through gcc nested function stubs. */
1517 rs6000_pc_in_call_dummy (CORE_ADDR pc
, CORE_ADDR sp
, CORE_ADDR fp
)
1519 return sp
< pc
&& pc
< fp
;
1522 /* Hook called when a new child process is started. */
1525 rs6000_create_inferior (int pid
)
1527 if (rs6000_set_host_arch_hook
)
1528 rs6000_set_host_arch_hook (pid
);
1531 /* Support for CONVERT_FROM_FUNC_PTR_ADDR(ADDR).
1533 Usually a function pointer's representation is simply the address
1534 of the function. On the RS/6000 however, a function pointer is
1535 represented by a pointer to a TOC entry. This TOC entry contains
1536 three words, the first word is the address of the function, the
1537 second word is the TOC pointer (r2), and the third word is the
1538 static chain value. Throughout GDB it is currently assumed that a
1539 function pointer contains the address of the function, which is not
1540 easy to fix. In addition, the conversion of a function address to
1541 a function pointer would require allocation of a TOC entry in the
1542 inferior's memory space, with all its drawbacks. To be able to
1543 call C++ virtual methods in the inferior (which are called via
1544 function pointers), find_function_addr uses this function to get the
1545 function address from a function pointer. */
1547 /* Return real function address if ADDR (a function pointer) is in the data
1548 space and is therefore a special function pointer. */
1551 rs6000_convert_from_func_ptr_addr (CORE_ADDR addr
)
1553 struct obj_section
*s
;
1555 s
= find_pc_section (addr
);
1556 if (s
&& s
->the_bfd_section
->flags
& SEC_CODE
)
1559 /* ADDR is in the data space, so it's a special function pointer. */
1560 return read_memory_addr (addr
, TDEP
->wordsize
);
1564 /* Handling the various POWER/PowerPC variants. */
1567 /* The arrays here called registers_MUMBLE hold information about available
1570 For each family of PPC variants, I've tried to isolate out the
1571 common registers and put them up front, so that as long as you get
1572 the general family right, GDB will correctly identify the registers
1573 common to that family. The common register sets are:
1575 For the 60x family: hid0 hid1 iabr dabr pir
1577 For the 505 and 860 family: eie eid nri
1579 For the 403 and 403GC: icdbdr esr dear evpr cdbcr tsr tcr pit tbhi
1580 tblo srr2 srr3 dbsr dbcr iac1 iac2 dac1 dac2 dccr iccr pbl1
1583 Most of these register groups aren't anything formal. I arrived at
1584 them by looking at the registers that occurred in more than one
1587 /* Convenience macros for populating register arrays. */
1589 /* Within another macro, convert S to a string. */
1593 /* Return a struct reg defining register NAME that's 32 bits on 32-bit systems
1594 and 64 bits on 64-bit systems. */
1595 #define R(name) { STR(name), 4, 8, 0 }
1597 /* Return a struct reg defining register NAME that's 32 bits on all
1599 #define R4(name) { STR(name), 4, 4, 0 }
1601 /* Return a struct reg defining register NAME that's 64 bits on all
1603 #define R8(name) { STR(name), 8, 8, 0 }
1605 /* Return a struct reg defining floating-point register NAME. */
1606 #define F(name) { STR(name), 8, 8, 1 }
1608 /* Return a struct reg defining register NAME that's 32 bits on 32-bit
1609 systems and that doesn't exist on 64-bit systems. */
1610 #define R32(name) { STR(name), 4, 0, 0 }
1612 /* Return a struct reg defining register NAME that's 64 bits on 64-bit
1613 systems and that doesn't exist on 32-bit systems. */
1614 #define R64(name) { STR(name), 0, 8, 0 }
1616 /* Return a struct reg placeholder for a register that doesn't exist. */
1617 #define R0 { 0, 0, 0, 0 }
1619 /* UISA registers common across all architectures, including POWER. */
1621 #define COMMON_UISA_REGS \
1622 /* 0 */ R(r0), R(r1), R(r2), R(r3), R(r4), R(r5), R(r6), R(r7), \
1623 /* 8 */ R(r8), R(r9), R(r10),R(r11),R(r12),R(r13),R(r14),R(r15), \
1624 /* 16 */ R(r16),R(r17),R(r18),R(r19),R(r20),R(r21),R(r22),R(r23), \
1625 /* 24 */ R(r24),R(r25),R(r26),R(r27),R(r28),R(r29),R(r30),R(r31), \
1626 /* 32 */ F(f0), F(f1), F(f2), F(f3), F(f4), F(f5), F(f6), F(f7), \
1627 /* 40 */ F(f8), F(f9), F(f10),F(f11),F(f12),F(f13),F(f14),F(f15), \
1628 /* 48 */ F(f16),F(f17),F(f18),F(f19),F(f20),F(f21),F(f22),F(f23), \
1629 /* 56 */ F(f24),F(f25),F(f26),F(f27),F(f28),F(f29),F(f30),F(f31), \
1630 /* 64 */ R(pc), R(ps)
1632 /* UISA-level SPRs for PowerPC. */
1633 #define PPC_UISA_SPRS \
1634 /* 66 */ R4(cr), R(lr), R(ctr), R4(xer), R0
1636 /* Segment registers, for PowerPC. */
1637 #define PPC_SEGMENT_REGS \
1638 /* 71 */ R32(sr0), R32(sr1), R32(sr2), R32(sr3), \
1639 /* 75 */ R32(sr4), R32(sr5), R32(sr6), R32(sr7), \
1640 /* 79 */ R32(sr8), R32(sr9), R32(sr10), R32(sr11), \
1641 /* 83 */ R32(sr12), R32(sr13), R32(sr14), R32(sr15)
1643 /* OEA SPRs for PowerPC. */
1644 #define PPC_OEA_SPRS \
1646 /* 88 */ R(ibat0u), R(ibat0l), R(ibat1u), R(ibat1l), \
1647 /* 92 */ R(ibat2u), R(ibat2l), R(ibat3u), R(ibat3l), \
1648 /* 96 */ R(dbat0u), R(dbat0l), R(dbat1u), R(dbat1l), \
1649 /* 100 */ R(dbat2u), R(dbat2l), R(dbat3u), R(dbat3l), \
1650 /* 104 */ R(sdr1), R64(asr), R(dar), R4(dsisr), \
1651 /* 108 */ R(sprg0), R(sprg1), R(sprg2), R(sprg3), \
1652 /* 112 */ R(srr0), R(srr1), R(tbl), R(tbu), \
1653 /* 116 */ R4(dec), R(dabr), R4(ear)
1655 /* IBM POWER (pre-PowerPC) architecture, user-level view. We only cover
1656 user-level SPR's. */
1657 static const struct reg registers_power
[] =
1660 /* 66 */ R4(cnd
), R(lr
), R(cnt
), R4(xer
), R4(mq
)
1663 /* PowerPC UISA - a PPC processor as viewed by user-level code. A UISA-only
1664 view of the PowerPC. */
1665 static const struct reg registers_powerpc
[] =
1671 /* IBM PowerPC 403. */
1672 static const struct reg registers_403
[] =
1678 /* 119 */ R(icdbdr
), R(esr
), R(dear
), R(evpr
),
1679 /* 123 */ R(cdbcr
), R(tsr
), R(tcr
), R(pit
),
1680 /* 127 */ R(tbhi
), R(tblo
), R(srr2
), R(srr3
),
1681 /* 131 */ R(dbsr
), R(dbcr
), R(iac1
), R(iac2
),
1682 /* 135 */ R(dac1
), R(dac2
), R(dccr
), R(iccr
),
1683 /* 139 */ R(pbl1
), R(pbu1
), R(pbl2
), R(pbu2
)
1686 /* IBM PowerPC 403GC. */
1687 static const struct reg registers_403GC
[] =
1693 /* 119 */ R(icdbdr
), R(esr
), R(dear
), R(evpr
),
1694 /* 123 */ R(cdbcr
), R(tsr
), R(tcr
), R(pit
),
1695 /* 127 */ R(tbhi
), R(tblo
), R(srr2
), R(srr3
),
1696 /* 131 */ R(dbsr
), R(dbcr
), R(iac1
), R(iac2
),
1697 /* 135 */ R(dac1
), R(dac2
), R(dccr
), R(iccr
),
1698 /* 139 */ R(pbl1
), R(pbu1
), R(pbl2
), R(pbu2
),
1699 /* 143 */ R(zpr
), R(pid
), R(sgr
), R(dcwr
),
1700 /* 147 */ R(tbhu
), R(tblu
)
1703 /* Motorola PowerPC 505. */
1704 static const struct reg registers_505
[] =
1710 /* 119 */ R(eie
), R(eid
), R(nri
)
1713 /* Motorola PowerPC 860 or 850. */
1714 static const struct reg registers_860
[] =
1720 /* 119 */ R(eie
), R(eid
), R(nri
), R(cmpa
),
1721 /* 123 */ R(cmpb
), R(cmpc
), R(cmpd
), R(icr
),
1722 /* 127 */ R(der
), R(counta
), R(countb
), R(cmpe
),
1723 /* 131 */ R(cmpf
), R(cmpg
), R(cmph
), R(lctrl1
),
1724 /* 135 */ R(lctrl2
), R(ictrl
), R(bar
), R(ic_cst
),
1725 /* 139 */ R(ic_adr
), R(ic_dat
), R(dc_cst
), R(dc_adr
),
1726 /* 143 */ R(dc_dat
), R(dpdr
), R(dpir
), R(immr
),
1727 /* 147 */ R(mi_ctr
), R(mi_ap
), R(mi_epn
), R(mi_twc
),
1728 /* 151 */ R(mi_rpn
), R(md_ctr
), R(m_casid
), R(md_ap
),
1729 /* 155 */ R(md_epn
), R(md_twb
), R(md_twc
), R(md_rpn
),
1730 /* 159 */ R(m_tw
), R(mi_dbcam
), R(mi_dbram0
), R(mi_dbram1
),
1731 /* 163 */ R(md_dbcam
), R(md_dbram0
), R(md_dbram1
)
1734 /* Motorola PowerPC 601. Note that the 601 has different register numbers
1735 for reading and writing RTCU and RTCL. However, how one reads and writes a
1736 register is the stub's problem. */
1737 static const struct reg registers_601
[] =
1743 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1744 /* 123 */ R(pir
), R(mq
), R(rtcu
), R(rtcl
)
1747 /* Motorola PowerPC 602. */
1748 static const struct reg registers_602
[] =
1754 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R0
,
1755 /* 123 */ R0
, R(tcr
), R(ibr
), R(esassr
),
1756 /* 127 */ R(sebr
), R(ser
), R(sp
), R(lt
)
1759 /* Motorola/IBM PowerPC 603 or 603e. */
1760 static const struct reg registers_603
[] =
1766 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R0
,
1767 /* 123 */ R0
, R(dmiss
), R(dcmp
), R(hash1
),
1768 /* 127 */ R(hash2
), R(imiss
), R(icmp
), R(rpa
)
1771 /* Motorola PowerPC 604 or 604e. */
1772 static const struct reg registers_604
[] =
1778 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1779 /* 123 */ R(pir
), R(mmcr0
), R(pmc1
), R(pmc2
),
1780 /* 127 */ R(sia
), R(sda
)
1783 /* Motorola/IBM PowerPC 750 or 740. */
1784 static const struct reg registers_750
[] =
1790 /* 119 */ R(hid0
), R(hid1
), R(iabr
), R(dabr
),
1791 /* 123 */ R0
, R(ummcr0
), R(upmc1
), R(upmc2
),
1792 /* 127 */ R(usia
), R(ummcr1
), R(upmc3
), R(upmc4
),
1793 /* 131 */ R(mmcr0
), R(pmc1
), R(pmc2
), R(sia
),
1794 /* 135 */ R(mmcr1
), R(pmc3
), R(pmc4
), R(l2cr
),
1795 /* 139 */ R(ictc
), R(thrm1
), R(thrm2
), R(thrm3
)
1799 /* Information about a particular processor variant. */
1803 /* Name of this variant. */
1806 /* English description of the variant. */
1809 /* bfd_arch_info.arch corresponding to variant. */
1810 enum bfd_architecture arch
;
1812 /* bfd_arch_info.mach corresponding to variant. */
1815 /* Table of register names; registers[R] is the name of the register
1818 const struct reg
*regs
;
1821 #define num_registers(list) (sizeof (list) / sizeof((list)[0]))
1824 /* Information in this table comes from the following web sites:
1825 IBM: http://www.chips.ibm.com:80/products/embedded/
1826 Motorola: http://www.mot.com/SPS/PowerPC/
1828 I'm sure I've got some of the variant descriptions not quite right.
1829 Please report any inaccuracies you find to GDB's maintainer.
1831 If you add entries to this table, please be sure to allow the new
1832 value as an argument to the --with-cpu flag, in configure.in. */
1834 static const struct variant variants
[] =
1836 {"powerpc", "PowerPC user-level", bfd_arch_powerpc
,
1837 bfd_mach_ppc
, num_registers (registers_powerpc
), registers_powerpc
},
1838 {"power", "POWER user-level", bfd_arch_rs6000
,
1839 bfd_mach_rs6k
, num_registers (registers_power
), registers_power
},
1840 {"403", "IBM PowerPC 403", bfd_arch_powerpc
,
1841 bfd_mach_ppc_403
, num_registers (registers_403
), registers_403
},
1842 {"601", "Motorola PowerPC 601", bfd_arch_powerpc
,
1843 bfd_mach_ppc_601
, num_registers (registers_601
), registers_601
},
1844 {"602", "Motorola PowerPC 602", bfd_arch_powerpc
,
1845 bfd_mach_ppc_602
, num_registers (registers_602
), registers_602
},
1846 {"603", "Motorola/IBM PowerPC 603 or 603e", bfd_arch_powerpc
,
1847 bfd_mach_ppc_603
, num_registers (registers_603
), registers_603
},
1848 {"604", "Motorola PowerPC 604 or 604e", bfd_arch_powerpc
,
1849 604, num_registers (registers_604
), registers_604
},
1850 {"403GC", "IBM PowerPC 403GC", bfd_arch_powerpc
,
1851 bfd_mach_ppc_403gc
, num_registers (registers_403GC
), registers_403GC
},
1852 {"505", "Motorola PowerPC 505", bfd_arch_powerpc
,
1853 bfd_mach_ppc_505
, num_registers (registers_505
), registers_505
},
1854 {"860", "Motorola PowerPC 860 or 850", bfd_arch_powerpc
,
1855 bfd_mach_ppc_860
, num_registers (registers_860
), registers_860
},
1856 {"750", "Motorola/IBM PowerPC 750 or 740", bfd_arch_powerpc
,
1857 bfd_mach_ppc_750
, num_registers (registers_750
), registers_750
},
1859 /* FIXME: I haven't checked the register sets of the following. */
1860 {"620", "Motorola PowerPC 620", bfd_arch_powerpc
,
1861 bfd_mach_ppc_620
, num_registers (registers_powerpc
), registers_powerpc
},
1862 {"a35", "PowerPC A35", bfd_arch_powerpc
,
1863 bfd_mach_ppc_a35
, num_registers (registers_powerpc
), registers_powerpc
},
1864 {"rs1", "IBM POWER RS1", bfd_arch_rs6000
,
1865 bfd_mach_rs6k_rs1
, num_registers (registers_power
), registers_power
},
1866 {"rsc", "IBM POWER RSC", bfd_arch_rs6000
,
1867 bfd_mach_rs6k_rsc
, num_registers (registers_power
), registers_power
},
1868 {"rs2", "IBM POWER RS2", bfd_arch_rs6000
,
1869 bfd_mach_rs6k_rs2
, num_registers (registers_power
), registers_power
},
1874 #undef num_registers
1876 /* Look up the variant named NAME in the `variants' table. Return a
1877 pointer to the struct variant, or null if we couldn't find it. */
1879 static const struct variant
*
1880 find_variant_by_name (char *name
)
1882 const struct variant
*v
;
1884 for (v
= variants
; v
->name
; v
++)
1885 if (!strcmp (name
, v
->name
))
1891 /* Return the variant corresponding to architecture ARCH and machine number
1892 MACH. If no such variant exists, return null. */
1894 static const struct variant
*
1895 find_variant_by_arch (enum bfd_architecture arch
, unsigned long mach
)
1897 const struct variant
*v
;
1899 for (v
= variants
; v
->name
; v
++)
1900 if (arch
== v
->arch
&& mach
== v
->mach
)
1910 process_note_abi_tag_sections (bfd
*abfd
, asection
*sect
, void *obj
)
1912 int *os_ident_ptr
= obj
;
1914 unsigned int sectsize
;
1916 name
= bfd_get_section_name (abfd
, sect
);
1917 sectsize
= bfd_section_size (abfd
, sect
);
1918 if (strcmp (name
, ".note.ABI-tag") == 0 && sectsize
> 0)
1920 unsigned int name_length
, data_length
, note_type
;
1921 char *note
= alloca (sectsize
);
1923 bfd_get_section_contents (abfd
, sect
, note
,
1924 (file_ptr
) 0, (bfd_size_type
) sectsize
);
1926 name_length
= bfd_h_get_32 (abfd
, note
);
1927 data_length
= bfd_h_get_32 (abfd
, note
+ 4);
1928 note_type
= bfd_h_get_32 (abfd
, note
+ 8);
1930 if (name_length
== 4 && data_length
== 16 && note_type
== 1
1931 && strcmp (note
+ 12, "GNU") == 0)
1933 int os_number
= bfd_h_get_32 (abfd
, note
+ 16);
1935 /* The case numbers are from abi-tags in glibc */
1939 *os_ident_ptr
= ELFOSABI_LINUX
;
1942 *os_ident_ptr
= ELFOSABI_HURD
;
1945 *os_ident_ptr
= ELFOSABI_SOLARIS
;
1949 "process_note_abi_sections: unknown OS number %d", os_number
);
1956 /* Return one of the ELFOSABI_ constants for BFDs representing ELF
1957 executables. If it's not an ELF executable or if the OS/ABI couldn't
1958 be determined, simply return -1. */
1961 get_elfosabi (bfd
*abfd
)
1965 if (abfd
!= NULL
&& bfd_get_flavour (abfd
) == bfd_target_elf_flavour
)
1967 elfosabi
= elf_elfheader (abfd
)->e_ident
[EI_OSABI
];
1969 /* When elfosabi is 0 (ELFOSABI_NONE), this is supposed to indicate
1970 that we're on a SYSV system. However, GNU/Linux uses a note section
1971 to record OS/ABI info, but leaves e_ident[EI_OSABI] zero. So we
1972 have to check the note sections too. */
1975 bfd_map_over_sections (abfd
,
1976 process_note_abi_tag_sections
,
1986 /* Initialize the current architecture based on INFO. If possible, re-use an
1987 architecture from ARCHES, which is a list of architectures already created
1988 during this debugging session.
1990 Called e.g. at program startup, when reading a core file, and when reading
1993 static struct gdbarch
*
1994 rs6000_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
1996 struct gdbarch
*gdbarch
;
1997 struct gdbarch_tdep
*tdep
;
1998 int wordsize
, from_xcoff_exec
, from_elf_exec
, power
, i
, off
;
2000 const struct variant
*v
;
2001 enum bfd_architecture arch
;
2004 int osabi
, sysv_abi
;
2006 from_xcoff_exec
= info
.abfd
&& info
.abfd
->format
== bfd_object
&&
2007 bfd_get_flavour (info
.abfd
) == bfd_target_xcoff_flavour
;
2009 from_elf_exec
= info
.abfd
&& info
.abfd
->format
== bfd_object
&&
2010 bfd_get_flavour (info
.abfd
) == bfd_target_elf_flavour
;
2012 sysv_abi
= info
.abfd
&& bfd_get_flavour (info
.abfd
) == bfd_target_elf_flavour
;
2014 osabi
= get_elfosabi (info
.abfd
);
2016 /* Check word size. If INFO is from a binary file, infer it from that,
2017 else use the previously-inferred size. */
2018 if (from_xcoff_exec
)
2020 if (xcoff_data (info
.abfd
)->xcoff64
)
2025 else if (from_elf_exec
)
2027 if (elf_elfheader (info
.abfd
)->e_ident
[EI_CLASS
] == ELFCLASS64
)
2036 wordsize
= tdep
->wordsize
;
2041 /* Find a candidate among extant architectures. */
2042 for (arches
= gdbarch_list_lookup_by_info (arches
, &info
);
2044 arches
= gdbarch_list_lookup_by_info (arches
->next
, &info
))
2046 /* Word size in the various PowerPC bfd_arch_info structs isn't
2047 meaningful, because 64-bit CPUs can run in 32-bit mode. So, perform
2048 separate word size check. */
2049 tdep
= gdbarch_tdep (arches
->gdbarch
);
2050 if (tdep
&& tdep
->wordsize
== wordsize
&& tdep
->osabi
== osabi
)
2051 return arches
->gdbarch
;
2054 /* None found, create a new architecture from INFO, whose bfd_arch_info
2055 validity depends on the source:
2056 - executable useless
2057 - rs6000_host_arch() good
2059 - "set arch" trust blindly
2060 - GDB startup useless but harmless */
2062 if (!from_xcoff_exec
)
2064 arch
= info
.bfd_architecture
;
2065 mach
= info
.bfd_arch_info
->mach
;
2069 arch
= bfd_arch_powerpc
;
2071 bfd_default_set_arch_mach (&abfd
, arch
, mach
);
2072 info
.bfd_arch_info
= bfd_get_arch_info (&abfd
);
2074 tdep
= xmalloc (sizeof (struct gdbarch_tdep
));
2075 tdep
->wordsize
= wordsize
;
2076 tdep
->osabi
= osabi
;
2077 gdbarch
= gdbarch_alloc (&info
, tdep
);
2078 power
= arch
== bfd_arch_rs6000
;
2080 /* Select instruction printer. */
2081 tm_print_insn
= arch
== power
? print_insn_rs6000
:
2082 info
.byte_order
== BIG_ENDIAN
? print_insn_big_powerpc
:
2083 print_insn_little_powerpc
;
2085 /* Choose variant. */
2086 v
= find_variant_by_arch (arch
, mach
);
2088 v
= find_variant_by_name (power
? "power" : "powerpc");
2089 tdep
->regs
= v
->regs
;
2091 /* Calculate byte offsets in raw register array. */
2092 tdep
->regoff
= xmalloc (v
->nregs
* sizeof (int));
2093 for (i
= off
= 0; i
< v
->nregs
; i
++)
2095 tdep
->regoff
[i
] = off
;
2096 off
+= regsize (v
->regs
+ i
, wordsize
);
2099 set_gdbarch_read_pc (gdbarch
, generic_target_read_pc
);
2100 set_gdbarch_write_pc (gdbarch
, generic_target_write_pc
);
2101 set_gdbarch_read_fp (gdbarch
, generic_target_read_fp
);
2102 set_gdbarch_write_fp (gdbarch
, generic_target_write_fp
);
2103 set_gdbarch_read_sp (gdbarch
, generic_target_read_sp
);
2104 set_gdbarch_write_sp (gdbarch
, generic_target_write_sp
);
2106 set_gdbarch_num_regs (gdbarch
, v
->nregs
);
2107 set_gdbarch_sp_regnum (gdbarch
, 1);
2108 set_gdbarch_fp_regnum (gdbarch
, 1);
2109 set_gdbarch_pc_regnum (gdbarch
, 64);
2110 set_gdbarch_register_name (gdbarch
, rs6000_register_name
);
2111 set_gdbarch_register_size (gdbarch
, wordsize
);
2112 set_gdbarch_register_bytes (gdbarch
, off
);
2113 set_gdbarch_register_byte (gdbarch
, rs6000_register_byte
);
2114 set_gdbarch_register_raw_size (gdbarch
, rs6000_register_raw_size
);
2115 set_gdbarch_max_register_raw_size (gdbarch
, 8);
2116 set_gdbarch_register_virtual_size (gdbarch
, rs6000_register_virtual_size
);
2117 set_gdbarch_max_register_virtual_size (gdbarch
, 8);
2118 set_gdbarch_register_virtual_type (gdbarch
, rs6000_register_virtual_type
);
2120 set_gdbarch_ptr_bit (gdbarch
, wordsize
* TARGET_CHAR_BIT
);
2121 set_gdbarch_short_bit (gdbarch
, 2 * TARGET_CHAR_BIT
);
2122 set_gdbarch_int_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
2123 set_gdbarch_long_bit (gdbarch
, wordsize
* TARGET_CHAR_BIT
);
2124 set_gdbarch_long_long_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2125 set_gdbarch_float_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
2126 set_gdbarch_double_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2127 set_gdbarch_long_double_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
2129 set_gdbarch_use_generic_dummy_frames (gdbarch
, 1);
2130 set_gdbarch_call_dummy_length (gdbarch
, 0);
2131 set_gdbarch_call_dummy_location (gdbarch
, AT_ENTRY_POINT
);
2132 set_gdbarch_call_dummy_address (gdbarch
, entry_point_address
);
2133 set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch
, 1);
2134 set_gdbarch_call_dummy_breakpoint_offset (gdbarch
, 0);
2135 set_gdbarch_call_dummy_start_offset (gdbarch
, 0);
2136 set_gdbarch_pc_in_call_dummy (gdbarch
, generic_pc_in_call_dummy
);
2137 set_gdbarch_call_dummy_p (gdbarch
, 1);
2138 set_gdbarch_call_dummy_stack_adjust_p (gdbarch
, 0);
2139 set_gdbarch_get_saved_register (gdbarch
, generic_get_saved_register
);
2140 set_gdbarch_fix_call_dummy (gdbarch
, rs6000_fix_call_dummy
);
2141 set_gdbarch_push_dummy_frame (gdbarch
, generic_push_dummy_frame
);
2142 set_gdbarch_save_dummy_frame_tos (gdbarch
, generic_save_dummy_frame_tos
);
2143 set_gdbarch_push_return_address (gdbarch
, ppc_push_return_address
);
2144 set_gdbarch_believe_pcc_promotion (gdbarch
, 1);
2145 set_gdbarch_coerce_float_to_double (gdbarch
, rs6000_coerce_float_to_double
);
2147 set_gdbarch_register_convertible (gdbarch
, rs6000_register_convertible
);
2148 set_gdbarch_register_convert_to_virtual (gdbarch
, rs6000_register_convert_to_virtual
);
2149 set_gdbarch_register_convert_to_raw (gdbarch
, rs6000_register_convert_to_raw
);
2151 set_gdbarch_extract_return_value (gdbarch
, rs6000_extract_return_value
);
2154 set_gdbarch_push_arguments (gdbarch
, ppc_sysv_abi_push_arguments
);
2156 set_gdbarch_push_arguments (gdbarch
, rs6000_push_arguments
);
2158 set_gdbarch_store_struct_return (gdbarch
, rs6000_store_struct_return
);
2159 set_gdbarch_store_return_value (gdbarch
, rs6000_store_return_value
);
2160 set_gdbarch_extract_struct_value_address (gdbarch
, rs6000_extract_struct_value_address
);
2161 set_gdbarch_use_struct_convention (gdbarch
, generic_use_struct_convention
);
2163 set_gdbarch_pop_frame (gdbarch
, rs6000_pop_frame
);
2165 set_gdbarch_skip_prologue (gdbarch
, rs6000_skip_prologue
);
2166 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
2167 set_gdbarch_decr_pc_after_break (gdbarch
, 0);
2168 set_gdbarch_function_start_offset (gdbarch
, 0);
2169 set_gdbarch_breakpoint_from_pc (gdbarch
, rs6000_breakpoint_from_pc
);
2171 /* Not sure on this. FIXMEmgo */
2172 set_gdbarch_frame_args_skip (gdbarch
, 8);
2174 set_gdbarch_frame_chain_valid (gdbarch
, file_frame_chain_valid
);
2175 if (osabi
== ELFOSABI_LINUX
)
2177 set_gdbarch_frameless_function_invocation (gdbarch
,
2178 ppc_linux_frameless_function_invocation
);
2179 set_gdbarch_frame_chain (gdbarch
, ppc_linux_frame_chain
);
2180 set_gdbarch_frame_saved_pc (gdbarch
, ppc_linux_frame_saved_pc
);
2182 set_gdbarch_frame_init_saved_regs (gdbarch
,
2183 ppc_linux_frame_init_saved_regs
);
2184 set_gdbarch_init_extra_frame_info (gdbarch
,
2185 ppc_linux_init_extra_frame_info
);
2187 set_gdbarch_memory_remove_breakpoint (gdbarch
,
2188 ppc_linux_memory_remove_breakpoint
);
2192 set_gdbarch_frameless_function_invocation (gdbarch
,
2193 rs6000_frameless_function_invocation
);
2194 set_gdbarch_frame_chain (gdbarch
, rs6000_frame_chain
);
2195 set_gdbarch_frame_saved_pc (gdbarch
, rs6000_frame_saved_pc
);
2197 set_gdbarch_frame_init_saved_regs (gdbarch
, rs6000_frame_init_saved_regs
);
2198 set_gdbarch_init_extra_frame_info (gdbarch
, rs6000_init_extra_frame_info
);
2200 /* Handle RS/6000 function pointers. */
2201 set_gdbarch_convert_from_func_ptr_addr (gdbarch
,
2202 rs6000_convert_from_func_ptr_addr
);
2204 set_gdbarch_frame_args_address (gdbarch
, rs6000_frame_args_address
);
2205 set_gdbarch_frame_locals_address (gdbarch
, rs6000_frame_args_address
);
2206 set_gdbarch_saved_pc_after_call (gdbarch
, rs6000_saved_pc_after_call
);
2208 /* We can't tell how many args there are
2209 now that the C compiler delays popping them. */
2210 set_gdbarch_frame_num_args (gdbarch
, frame_num_args_unknown
);
2215 /* Initialization code. */
2218 _initialize_rs6000_tdep (void)
2220 register_gdbarch_init (bfd_arch_rs6000
, rs6000_gdbarch_init
);
2221 register_gdbarch_init (bfd_arch_powerpc
, rs6000_gdbarch_init
);