1 /* Target-dependent code for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997
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, Boston, MA 02111-1307, USA. */
30 #include "xcoffsolib.h"
34 /* Breakpoint shadows for the single step instructions will be kept here. */
36 static struct sstep_breaks
{
37 /* Address, or 0 if this is not in use. */
39 /* Shadow contents. */
43 /* Hook for determining the TOC address when calling functions in the
44 inferior under AIX. The initialization code in rs6000-nat.c sets
45 this hook to point to find_toc_address. */
47 CORE_ADDR (*find_toc_address_hook
) PARAMS ((CORE_ADDR
)) = NULL
;
49 /* Static function prototypes */
51 static CORE_ADDR branch_dest
PARAMS ((int opcode
, int instr
, CORE_ADDR pc
,
54 static void frame_get_saved_regs
PARAMS ((struct frame_info
*fi
,
55 struct rs6000_framedata
*fdatap
));
57 static void pop_dummy_frame
PARAMS ((void));
59 static CORE_ADDR frame_initial_stack_address
PARAMS ((struct frame_info
*));
61 /* Fill in fi->saved_regs */
63 struct frame_extra_info
65 /* Functions calling alloca() change the value of the stack
66 pointer. We need to use initial stack pointer (which is saved in
67 r31 by gcc) in such cases. If a compiler emits traceback table,
68 then we should use the alloca register specified in traceback
70 CORE_ADDR initial_sp
; /* initial stack pointer. */
74 rs6000_init_extra_frame_info (fromleaf
, fi
)
76 struct frame_info
*fi
;
78 fi
->extra_info
= (struct frame_extra_info
*)
79 frame_obstack_alloc (sizeof (struct frame_extra_info
));
80 fi
->extra_info
->initial_sp
= 0;
81 if (fi
->next
!= (CORE_ADDR
) 0
82 && fi
->pc
< TEXT_SEGMENT_BASE
)
83 /* We're in get_prev_frame */
84 /* and this is a special signal frame. */
85 /* (fi->pc will be some low address in the kernel, */
86 /* to which the signal handler returns). */
87 fi
->signal_handler_caller
= 1;
92 rs6000_frame_init_saved_regs (fi
)
93 struct frame_info
*fi
;
95 frame_get_saved_regs (fi
, NULL
);
99 rs6000_frame_args_address (fi
)
100 struct frame_info
*fi
;
102 if (fi
->extra_info
->initial_sp
!= 0)
103 return fi
->extra_info
->initial_sp
;
105 return frame_initial_stack_address (fi
);
109 /* Calculate the destination of a branch/jump. Return -1 if not a branch. */
112 branch_dest (opcode
, instr
, pc
, safety
)
123 absolute
= (int) ((instr
>> 1) & 1);
127 immediate
= ((instr
& ~3) << 6) >> 6; /* br unconditional */
131 dest
= pc
+ immediate
;
135 immediate
= ((instr
& ~3) << 16) >> 16; /* br conditional */
139 dest
= pc
+ immediate
;
143 ext_op
= (instr
>>1) & 0x3ff;
145 if (ext_op
== 16) /* br conditional register */
147 dest
= read_register (LR_REGNUM
) & ~3;
149 /* If we are about to return from a signal handler, dest is
150 something like 0x3c90. The current frame is a signal handler
151 caller frame, upon completion of the sigreturn system call
152 execution will return to the saved PC in the frame. */
153 if (dest
< TEXT_SEGMENT_BASE
)
155 struct frame_info
*fi
;
157 fi
= get_current_frame ();
159 dest
= read_memory_integer (fi
->frame
+ SIG_FRAME_PC_OFFSET
,
164 else if (ext_op
== 528) /* br cond to count reg */
166 dest
= read_register (CTR_REGNUM
) & ~3;
168 /* If we are about to execute a system call, dest is something
169 like 0x22fc or 0x3b00. Upon completion the system call
170 will return to the address in the link register. */
171 if (dest
< TEXT_SEGMENT_BASE
)
172 dest
= read_register (LR_REGNUM
) & ~3;
179 return (dest
< TEXT_SEGMENT_BASE
) ? safety
: dest
;
183 /* Sequence of bytes for breakpoint instruction. */
185 #define BIG_BREAKPOINT { 0x7d, 0x82, 0x10, 0x08 }
186 #define LITTLE_BREAKPOINT { 0x08, 0x10, 0x82, 0x7d }
189 rs6000_breakpoint_from_pc (bp_addr
, bp_size
)
193 static unsigned char big_breakpoint
[] = BIG_BREAKPOINT
;
194 static unsigned char little_breakpoint
[] = LITTLE_BREAKPOINT
;
196 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
)
197 return big_breakpoint
;
199 return little_breakpoint
;
203 /* AIX does not support PT_STEP. Simulate it. */
206 rs6000_software_single_step (signal
, insert_breakpoints_p
)
208 int insert_breakpoints_p
;
210 #define INSNLEN(OPCODE) 4
212 static char le_breakp
[] = LITTLE_BREAKPOINT
;
213 static char be_breakp
[] = BIG_BREAKPOINT
;
214 char *breakp
= TARGET_BYTE_ORDER
== BIG_ENDIAN
? be_breakp
: le_breakp
;
220 if (insert_breakpoints_p
) {
224 insn
= read_memory_integer (loc
, 4);
226 breaks
[0] = loc
+ INSNLEN(insn
);
228 breaks
[1] = branch_dest (opcode
, insn
, loc
, breaks
[0]);
230 /* Don't put two breakpoints on the same address. */
231 if (breaks
[1] == breaks
[0])
234 stepBreaks
[1].address
= 0;
236 for (ii
=0; ii
< 2; ++ii
) {
238 /* ignore invalid breakpoint. */
239 if ( breaks
[ii
] == -1)
242 read_memory (breaks
[ii
], stepBreaks
[ii
].data
, 4);
244 write_memory (breaks
[ii
], breakp
, 4);
245 stepBreaks
[ii
].address
= breaks
[ii
];
250 /* remove step breakpoints. */
251 for (ii
=0; ii
< 2; ++ii
)
252 if (stepBreaks
[ii
].address
!= 0)
254 (stepBreaks
[ii
].address
, stepBreaks
[ii
].data
, 4);
257 errno
= 0; /* FIXME, don't ignore errors! */
258 /* What errors? {read,write}_memory call error(). */
262 /* return pc value after skipping a function prologue and also return
263 information about a function frame.
265 in struct rs6000_framedata fdata:
266 - frameless is TRUE, if function does not have a frame.
267 - nosavedpc is TRUE, if function does not save %pc value in its frame.
268 - offset is the initial size of this stack frame --- the amount by
269 which we decrement the sp to allocate the frame.
270 - saved_gpr is the number of the first saved gpr.
271 - saved_fpr is the number of the first saved fpr.
272 - alloca_reg is the number of the register used for alloca() handling.
274 - gpr_offset is the offset of the first saved gpr from the previous frame.
275 - fpr_offset is the offset of the first saved fpr from the previous frame.
276 - lr_offset is the offset of the saved lr
277 - cr_offset is the offset of the saved cr
280 #define SIGNED_SHORT(x) \
281 ((sizeof (short) == 2) \
282 ? ((int)(short)(x)) \
283 : ((int)((((x) & 0xffff) ^ 0x8000) - 0x8000)))
285 #define GET_SRC_REG(x) (((x) >> 21) & 0x1f)
288 skip_prologue (pc
, fdata
)
290 struct rs6000_framedata
*fdata
;
292 CORE_ADDR orig_pc
= pc
;
300 int minimal_toc_loaded
= 0;
301 static struct rs6000_framedata zero_frame
;
304 fdata
->saved_gpr
= -1;
305 fdata
->saved_fpr
= -1;
306 fdata
->alloca_reg
= -1;
307 fdata
->frameless
= 1;
308 fdata
->nosavedpc
= 1;
310 if (target_read_memory (pc
, buf
, 4))
311 return pc
; /* Can't access it -- assume no prologue. */
313 /* Assume that subsequent fetches can fail with low probability. */
318 op
= read_memory_integer (pc
, 4);
320 if ((op
& 0xfc1fffff) == 0x7c0802a6) { /* mflr Rx */
321 lr_reg
= (op
& 0x03e00000) | 0x90010000;
324 } else if ((op
& 0xfc1fffff) == 0x7c000026) { /* mfcr Rx */
325 cr_reg
= (op
& 0x03e00000) | 0x90010000;
328 } else if ((op
& 0xfc1f0000) == 0xd8010000) { /* stfd Rx,NUM(r1) */
329 reg
= GET_SRC_REG (op
);
330 if (fdata
->saved_fpr
== -1 || fdata
->saved_fpr
> reg
) {
331 fdata
->saved_fpr
= reg
;
332 fdata
->fpr_offset
= SIGNED_SHORT (op
) + offset
;
336 } else if (((op
& 0xfc1f0000) == 0xbc010000) || /* stm Rx, NUM(r1) */
337 ((op
& 0xfc1f0000) == 0x90010000 && /* st rx,NUM(r1),
339 (op
& 0x03e00000) >= 0x01a00000)) {
341 reg
= GET_SRC_REG (op
);
342 if (fdata
->saved_gpr
== -1 || fdata
->saved_gpr
> reg
) {
343 fdata
->saved_gpr
= reg
;
344 fdata
->gpr_offset
= SIGNED_SHORT (op
) + offset
;
348 } else if ((op
& 0xffff0000) == 0x3c000000) { /* addis 0,0,NUM, used
350 fdata
->offset
= (op
& 0x0000ffff) << 16;
351 fdata
->frameless
= 0;
354 } else if ((op
& 0xffff0000) == 0x60000000) { /* ori 0,0,NUM, 2nd ha
355 lf of >= 32k frames */
356 fdata
->offset
|= (op
& 0x0000ffff);
357 fdata
->frameless
= 0;
360 } else if ((op
& 0xffff0000) == lr_reg
) { /* st Rx,NUM(r1)
362 fdata
->lr_offset
= SIGNED_SHORT (op
) + offset
;
363 fdata
->nosavedpc
= 0;
367 } else if ((op
& 0xffff0000) == cr_reg
) { /* st Rx,NUM(r1)
369 fdata
->cr_offset
= SIGNED_SHORT (op
) + offset
;
373 } else if (op
== 0x48000005) { /* bl .+4 used in
377 } else if (op
== 0x48000004) { /* b .+4 (xlc) */
380 } else if (((op
& 0xffff0000) == 0x801e0000 || /* lwz 0,NUM(r30), used
381 in V.4 -mrelocatable */
382 op
== 0x7fc0f214) && /* add r30,r0,r30, used
383 in V.4 -mrelocatable */
384 lr_reg
== 0x901e0000) {
387 } else if ((op
& 0xffff0000) == 0x3fc00000 || /* addis 30,0,foo@ha, used
388 in V.4 -mminimal-toc */
389 (op
& 0xffff0000) == 0x3bde0000) { /* addi 30,30,foo@l */
392 } else if ((op
& 0xfc000000) == 0x48000000) { /* bl foo,
395 fdata
->frameless
= 0;
396 /* Don't skip over the subroutine call if it is not within the first
397 three instructions of the prologue. */
398 if ((pc
- orig_pc
) > 8)
401 op
= read_memory_integer (pc
+4, 4);
403 /* At this point, make sure this is not a trampoline function
404 (a function that simply calls another functions, and nothing else).
405 If the next is not a nop, this branch was part of the function
408 if (op
== 0x4def7b82 || op
== 0) /* crorc 15, 15, 15 */
409 break; /* don't skip over
413 /* update stack pointer */
414 } else if ((op
& 0xffff0000) == 0x94210000) { /* stu r1,NUM(r1) */
415 fdata
->frameless
= 0;
416 fdata
->offset
= SIGNED_SHORT (op
);
417 offset
= fdata
->offset
;
420 } else if (op
== 0x7c21016e) { /* stwux 1,1,0 */
421 fdata
->frameless
= 0;
422 offset
= fdata
->offset
;
425 /* Load up minimal toc pointer */
426 } else if ((op
>> 22) == 0x20f
427 && ! minimal_toc_loaded
) { /* l r31,... or l r30,... */
428 minimal_toc_loaded
= 1;
431 /* store parameters in stack */
432 } else if ((op
& 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
433 (op
& 0xfc1f0000) == 0xd8010000 || /* stfd Rx,NUM(r1) */
434 (op
& 0xfc1f0000) == 0xfc010000) { /* frsp, fp?,NUM(r1) */
437 /* store parameters in stack via frame pointer */
439 ((op
& 0xfc1f0000) == 0x901f0000 || /* st rx,NUM(r1) */
440 (op
& 0xfc1f0000) == 0xd81f0000 || /* stfd Rx,NUM(r1) */
441 (op
& 0xfc1f0000) == 0xfc1f0000)) { /* frsp, fp?,NUM(r1) */
444 /* Set up frame pointer */
445 } else if (op
== 0x603f0000 /* oril r31, r1, 0x0 */
446 || op
== 0x7c3f0b78) { /* mr r31, r1 */
447 fdata
->frameless
= 0;
449 fdata
->alloca_reg
= 31;
452 /* Another way to set up the frame pointer. */
453 } else if ((op
& 0xfc1fffff) == 0x38010000) { /* addi rX, r1, 0x0 */
454 fdata
->frameless
= 0;
456 fdata
->alloca_reg
= (op
& ~0x38010000) >> 21;
465 /* I have problems with skipping over __main() that I need to address
466 * sometime. Previously, I used to use misc_function_vector which
467 * didn't work as well as I wanted to be. -MGO */
469 /* If the first thing after skipping a prolog is a branch to a function,
470 this might be a call to an initializer in main(), introduced by gcc2.
471 We'd like to skip over it as well. Fortunately, xlc does some extra
472 work before calling a function right after a prologue, thus we can
473 single out such gcc2 behaviour. */
476 if ((op
& 0xfc000001) == 0x48000001) { /* bl foo, an initializer function? */
477 op
= read_memory_integer (pc
+4, 4);
479 if (op
== 0x4def7b82) { /* cror 0xf, 0xf, 0xf (nop) */
481 /* check and see if we are in main. If so, skip over this initializer
484 tmp
= find_pc_misc_function (pc
);
485 if (tmp
>= 0 && STREQ (misc_function_vector
[tmp
].name
, "main"))
491 fdata
->offset
= - fdata
->offset
;
496 /*************************************************************************
497 Support for creating pushind a dummy frame into the stack, and popping
499 *************************************************************************/
501 /* The total size of dummy frame is 436, which is;
506 and 24 extra bytes for the callee's link area. The last 24 bytes
507 for the link area might not be necessary, since it will be taken
508 care of by push_arguments(). */
510 #define DUMMY_FRAME_SIZE 436
512 #define DUMMY_FRAME_ADDR_SIZE 10
514 /* Make sure you initialize these in somewhere, in case gdb gives up what it
515 was debugging and starts debugging something else. FIXMEibm */
517 static int dummy_frame_count
= 0;
518 static int dummy_frame_size
= 0;
519 static CORE_ADDR
*dummy_frame_addr
= 0;
521 extern int stop_stack_dummy
;
523 /* push a dummy frame into stack, save all register. Currently we are saving
524 only gpr's and fpr's, which is not good enough! FIXMEmgo */
531 /* Same thing, target byte order. */
536 /* Same thing, target byte order. */
539 /* Needed to figure out where to save the dummy link area.
540 FIXME: There should be an easier way to do this, no? tiemann 9/9/95. */
541 struct rs6000_framedata fdata
;
545 target_fetch_registers (-1);
547 if (dummy_frame_count
>= dummy_frame_size
) {
548 dummy_frame_size
+= DUMMY_FRAME_ADDR_SIZE
;
549 if (dummy_frame_addr
)
550 dummy_frame_addr
= (CORE_ADDR
*) xrealloc
551 (dummy_frame_addr
, sizeof(CORE_ADDR
) * (dummy_frame_size
));
553 dummy_frame_addr
= (CORE_ADDR
*)
554 xmalloc (sizeof(CORE_ADDR
) * (dummy_frame_size
));
557 sp
= read_register(SP_REGNUM
);
558 pc
= read_register(PC_REGNUM
);
559 store_address (pc_targ
, 4, pc
);
561 skip_prologue (get_pc_function_start (pc
), &fdata
);
563 dummy_frame_addr
[dummy_frame_count
++] = sp
;
565 /* Be careful! If the stack pointer is not decremented first, then kernel
566 thinks he is free to use the space underneath it. And kernel actually
567 uses that area for IPC purposes when executing ptrace(2) calls. So
568 before writing register values into the new frame, decrement and update
569 %sp first in order to secure your frame. */
571 /* FIXME: We don't check if the stack really has this much space.
572 This is a problem on the ppc simulator (which only grants one page
573 (4096 bytes) by default. */
575 write_register (SP_REGNUM
, sp
-DUMMY_FRAME_SIZE
);
577 /* gdb relies on the state of current_frame. We'd better update it,
578 otherwise things like do_registers_info() wouldn't work properly! */
580 flush_cached_frames ();
582 /* save program counter in link register's space. */
583 write_memory (sp
+ (fdata
.lr_offset
? fdata
.lr_offset
: DEFAULT_LR_SAVE
),
586 /* save all floating point and general purpose registers here. */
589 for (ii
= 0; ii
< 32; ++ii
)
590 write_memory (sp
-8-(ii
*8), ®isters
[REGISTER_BYTE (31-ii
+FP0_REGNUM
)], 8);
593 for (ii
=1; ii
<=32; ++ii
)
594 write_memory (sp
-256-(ii
*4), ®isters
[REGISTER_BYTE (32-ii
)], 4);
596 /* so far, 32*2 + 32 words = 384 bytes have been written.
597 7 extra registers in our register set: pc, ps, cnd, lr, cnt, xer, mq */
599 for (ii
=1; ii
<= (LAST_UISA_SP_REGNUM
-FIRST_UISA_SP_REGNUM
+1); ++ii
) {
600 write_memory (sp
-384-(ii
*4),
601 ®isters
[REGISTER_BYTE (FPLAST_REGNUM
+ ii
)], 4);
604 /* Save sp or so called back chain right here. */
605 store_address (sp_targ
, 4, sp
);
606 write_memory (sp
-DUMMY_FRAME_SIZE
, sp_targ
, 4);
607 sp
-= DUMMY_FRAME_SIZE
;
609 /* And finally, this is the back chain. */
610 write_memory (sp
+8, pc_targ
, 4);
614 /* Pop a dummy frame.
616 In rs6000 when we push a dummy frame, we save all of the registers. This
617 is usually done before user calls a function explicitly.
619 After a dummy frame is pushed, some instructions are copied into stack,
620 and stack pointer is decremented even more. Since we don't have a frame
621 pointer to get back to the parent frame of the dummy, we start having
622 trouble poping it. Therefore, we keep a dummy frame stack, keeping
623 addresses of dummy frames as such. When poping happens and when we
624 detect that was a dummy frame, we pop it back to its parent by using
625 dummy frame stack (`dummy_frame_addr' array).
627 FIXME: This whole concept is broken. You should be able to detect
628 a dummy stack frame *on the user's stack itself*. When you do,
629 then you know the format of that stack frame -- including its
630 saved SP register! There should *not* be a separate stack in the
631 GDB process that keeps track of these dummy frames! -- gnu@cygnus.com Aug92
639 sp
= dummy_frame_addr
[--dummy_frame_count
];
641 /* restore all fpr's. */
642 for (ii
= 1; ii
<= 32; ++ii
)
643 read_memory (sp
-(ii
*8), ®isters
[REGISTER_BYTE (32-ii
+FP0_REGNUM
)], 8);
645 /* restore all gpr's */
646 for (ii
=1; ii
<= 32; ++ii
) {
647 read_memory (sp
-256-(ii
*4), ®isters
[REGISTER_BYTE (32-ii
)], 4);
650 /* restore the rest of the registers. */
651 for (ii
=1; ii
<=(LAST_UISA_SP_REGNUM
-FIRST_UISA_SP_REGNUM
+1); ++ii
)
652 read_memory (sp
-384-(ii
*4),
653 ®isters
[REGISTER_BYTE (FPLAST_REGNUM
+ ii
)], 4);
655 read_memory (sp
-(DUMMY_FRAME_SIZE
-8),
656 ®isters
[REGISTER_BYTE(PC_REGNUM
)], 4);
658 /* when a dummy frame was being pushed, we had to decrement %sp first, in
659 order to secure astack space. Thus, saved %sp (or %r1) value, is not the
660 one we should restore. Change it with the one we need. */
662 memcpy (®isters
[REGISTER_BYTE(FP_REGNUM
)], (char *) &sp
, sizeof (int));
664 /* Now we can restore all registers. */
666 target_store_registers (-1);
668 flush_cached_frames ();
672 /* pop the innermost frame, go back to the caller. */
677 CORE_ADDR pc
, lr
, sp
, prev_sp
; /* %pc, %lr, %sp */
678 struct rs6000_framedata fdata
;
679 struct frame_info
*frame
= get_current_frame ();
683 sp
= FRAME_FP (frame
);
685 if (stop_stack_dummy
)
687 if (USE_GENERIC_DUMMY_FRAMES
)
689 generic_pop_dummy_frame ();
690 flush_cached_frames ();
695 if (dummy_frame_count
)
701 /* Make sure that all registers are valid. */
702 read_register_bytes (0, NULL
, REGISTER_BYTES
);
704 /* figure out previous %pc value. If the function is frameless, it is
705 still in the link register, otherwise walk the frames and retrieve the
706 saved %pc value in the previous frame. */
708 addr
= get_pc_function_start (frame
->pc
);
709 (void) skip_prologue (addr
, &fdata
);
714 prev_sp
= read_memory_integer (sp
, 4);
715 if (fdata
.lr_offset
== 0)
716 lr
= read_register (LR_REGNUM
);
718 lr
= read_memory_integer (prev_sp
+ fdata
.lr_offset
, 4);
720 /* reset %pc value. */
721 write_register (PC_REGNUM
, lr
);
723 /* reset register values if any was saved earlier. */
725 if (fdata
.saved_gpr
!= -1)
727 addr
= prev_sp
+ fdata
.gpr_offset
;
728 for (ii
= fdata
.saved_gpr
; ii
<= 31; ++ii
) {
729 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
)], 4);
734 if (fdata
.saved_fpr
!= -1)
736 addr
= prev_sp
+ fdata
.fpr_offset
;
737 for (ii
= fdata
.saved_fpr
; ii
<= 31; ++ii
) {
738 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
+FP0_REGNUM
)], 8);
743 write_register (SP_REGNUM
, prev_sp
);
744 target_store_registers (-1);
745 flush_cached_frames ();
748 /* fixup the call sequence of a dummy function, with the real function address.
749 its argumets will be passed by gdb. */
752 rs6000_fix_call_dummy (dummyname
, pc
, fun
, nargs
, args
, type
, gcc_p
)
761 #define TOC_ADDR_OFFSET 20
762 #define TARGET_ADDR_OFFSET 28
765 CORE_ADDR target_addr
;
767 if (find_toc_address_hook
!= NULL
)
771 tocvalue
= (*find_toc_address_hook
) (fun
);
772 ii
= *(int*)((char*)dummyname
+ TOC_ADDR_OFFSET
);
773 ii
= (ii
& 0xffff0000) | (tocvalue
>> 16);
774 *(int*)((char*)dummyname
+ TOC_ADDR_OFFSET
) = ii
;
776 ii
= *(int*)((char*)dummyname
+ TOC_ADDR_OFFSET
+4);
777 ii
= (ii
& 0xffff0000) | (tocvalue
& 0x0000ffff);
778 *(int*)((char*)dummyname
+ TOC_ADDR_OFFSET
+4) = ii
;
782 ii
= *(int*)((char*)dummyname
+ TARGET_ADDR_OFFSET
);
783 ii
= (ii
& 0xffff0000) | (target_addr
>> 16);
784 *(int*)((char*)dummyname
+ TARGET_ADDR_OFFSET
) = ii
;
786 ii
= *(int*)((char*)dummyname
+ TARGET_ADDR_OFFSET
+4);
787 ii
= (ii
& 0xffff0000) | (target_addr
& 0x0000ffff);
788 *(int*)((char*)dummyname
+ TARGET_ADDR_OFFSET
+4) = ii
;
791 /* Pass the arguments in either registers, or in the stack. In RS6000,
792 the first eight words of the argument list (that might be less than
793 eight parameters if some parameters occupy more than one word) are
794 passed in r3..r11 registers. float and double parameters are
795 passed in fpr's, in addition to that. Rest of the parameters if any
796 are passed in user stack. There might be cases in which half of the
797 parameter is copied into registers, the other half is pushed into
800 If the function is returning a structure, then the return address is passed
801 in r3, then the first 7 words of the parameters can be passed in registers,
805 push_arguments (nargs
, args
, sp
, struct_return
, struct_addr
)
810 CORE_ADDR struct_addr
;
814 int argno
; /* current argument number */
815 int argbytes
; /* current argument byte */
816 char tmp_buffer
[50];
817 int f_argno
= 0; /* current floating point argno */
824 if (!USE_GENERIC_DUMMY_FRAMES
)
826 if (dummy_frame_count
<= 0)
827 printf_unfiltered ("FATAL ERROR -push_arguments()! frame not found!!\n");
830 /* The first eight words of ther arguments are passed in registers. Copy
833 If the function is returning a `struct', then the first word (which
834 will be passed in r3) is used for struct return address. In that
835 case we should advance one word and start from r4 register to copy
838 ii
= struct_return
? 1 : 0;
841 effectively indirect call... gcc does...
843 return_val example( float, int);
846 float in fp0, int in r3
847 offset of stack on overflow 8/16
848 for varargs, must go by type.
850 float in r3&r4, int in r5
851 offset of stack on overflow different
853 return in r3 or f0. If no float, must study how gcc emulates floats;
854 pay attention to arg promotion.
855 User may have to cast\args to handle promotion correctly
856 since gdb won't know if prototype supplied or not.
859 for (argno
=0, argbytes
=0; argno
< nargs
&& ii
<8; ++ii
) {
862 type
= check_typedef (VALUE_TYPE (arg
));
863 len
= TYPE_LENGTH (type
);
865 if (TYPE_CODE (type
) == TYPE_CODE_FLT
) {
867 /* floating point arguments are passed in fpr's, as well as gpr's.
868 There are 13 fpr's reserved for passing parameters. At this point
869 there is no way we would run out of them. */
873 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
875 memcpy (®isters
[REGISTER_BYTE(FP0_REGNUM
+ 1 + f_argno
)],
876 VALUE_CONTENTS (arg
),
883 /* Argument takes more than one register. */
884 while (argbytes
< len
) {
885 memset (®isters
[REGISTER_BYTE(ii
+3)], 0, sizeof(int));
886 memcpy (®isters
[REGISTER_BYTE(ii
+3)],
887 ((char*)VALUE_CONTENTS (arg
))+argbytes
,
888 (len
- argbytes
) > 4 ? 4 : len
- argbytes
);
892 goto ran_out_of_registers_for_arguments
;
897 else { /* Argument can fit in one register. No problem. */
898 memset (®isters
[REGISTER_BYTE(ii
+3)], 0, sizeof(int));
899 memcpy (®isters
[REGISTER_BYTE(ii
+3)], VALUE_CONTENTS (arg
), len
);
904 ran_out_of_registers_for_arguments
:
906 if (USE_GENERIC_DUMMY_FRAMES
)
908 saved_sp
= read_sp ();
912 /* location for 8 parameters are always reserved. */
915 /* another six words for back chain, TOC register, link register, etc. */
919 /* if there are more arguments, allocate space for them in
920 the stack, then push them starting from the ninth one. */
922 if ((argno
< nargs
) || argbytes
) {
926 space
+= ((len
- argbytes
+ 3) & -4);
932 for (; jj
< nargs
; ++jj
) {
933 value_ptr val
= args
[jj
];
934 space
+= ((TYPE_LENGTH (VALUE_TYPE (val
))) + 3) & -4;
937 /* add location required for the rest of the parameters */
938 space
= (space
+ 7) & -8;
941 /* This is another instance we need to be concerned about securing our
942 stack space. If we write anything underneath %sp (r1), we might conflict
943 with the kernel who thinks he is free to use this area. So, update %sp
944 first before doing anything else. */
946 write_register (SP_REGNUM
, sp
);
948 /* if the last argument copied into the registers didn't fit there
949 completely, push the rest of it into stack. */
952 write_memory (sp
+24+(ii
*4),
953 ((char*)VALUE_CONTENTS (arg
))+argbytes
,
956 ii
+= ((len
- argbytes
+ 3) & -4) / 4;
959 /* push the rest of the arguments into stack. */
960 for (; argno
< nargs
; ++argno
) {
963 type
= check_typedef (VALUE_TYPE (arg
));
964 len
= TYPE_LENGTH (type
);
967 /* float types should be passed in fpr's, as well as in the stack. */
968 if (TYPE_CODE (type
) == TYPE_CODE_FLT
&& f_argno
< 13) {
972 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
974 memcpy (®isters
[REGISTER_BYTE(FP0_REGNUM
+ 1 + f_argno
)],
975 VALUE_CONTENTS (arg
),
980 write_memory (sp
+24+(ii
*4), (char *) VALUE_CONTENTS (arg
), len
);
981 ii
+= ((len
+ 3) & -4) / 4;
985 /* Secure stack areas first, before doing anything else. */
986 write_register (SP_REGNUM
, sp
);
988 if (!USE_GENERIC_DUMMY_FRAMES
)
990 /* we want to copy 24 bytes of target's frame to dummy's frame,
991 then set back chain to point to new frame. */
993 saved_sp
= dummy_frame_addr
[dummy_frame_count
- 1];
994 read_memory (saved_sp
, tmp_buffer
, 24);
995 write_memory (sp
, tmp_buffer
, 24);
998 /* set back chain properly */
999 store_address (tmp_buffer
, 4, saved_sp
);
1000 write_memory (sp
, tmp_buffer
, 4);
1002 target_store_registers (-1);
1005 #ifdef ELF_OBJECT_FORMAT
1007 /* Function: ppc_push_return_address (pc, sp)
1008 Set up the return address for the inferior function call. */
1011 ppc_push_return_address (pc
, sp
)
1015 write_register (LR_REGNUM
, CALL_DUMMY_ADDRESS ());
1021 /* a given return value in `regbuf' with a type `valtype', extract and copy its
1022 value into `valbuf' */
1025 extract_return_value (valtype
, regbuf
, valbuf
)
1026 struct type
*valtype
;
1027 char regbuf
[REGISTER_BYTES
];
1032 if (TYPE_CODE (valtype
) == TYPE_CODE_FLT
) {
1034 double dd
; float ff
;
1035 /* floats and doubles are returned in fpr1. fpr's have a size of 8 bytes.
1036 We need to truncate the return value into float size (4 byte) if
1039 if (TYPE_LENGTH (valtype
) > 4) /* this is a double */
1041 ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)],
1042 TYPE_LENGTH (valtype
));
1044 memcpy (&dd
, ®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)], 8);
1046 memcpy (valbuf
, &ff
, sizeof(float));
1050 /* return value is copied starting from r3. */
1051 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
1052 && TYPE_LENGTH (valtype
) < REGISTER_RAW_SIZE (3))
1053 offset
= REGISTER_RAW_SIZE (3) - TYPE_LENGTH (valtype
);
1056 regbuf
+ REGISTER_BYTE (3) + offset
,
1057 TYPE_LENGTH (valtype
));
1062 /* keep structure return address in this variable.
1063 FIXME: This is a horrid kludge which should not be allowed to continue
1064 living. This only allows a single nested call to a structure-returning
1065 function. Come on, guys! -- gnu@cygnus.com, Aug 92 */
1067 CORE_ADDR rs6000_struct_return_address
;
1070 /* Indirect function calls use a piece of trampoline code to do context
1071 switching, i.e. to set the new TOC table. Skip such code if we are on
1072 its first instruction (as when we have single-stepped to here).
1073 Also skip shared library trampoline code (which is different from
1074 indirect function call trampolines).
1075 Result is desired PC to step until, or NULL if we are not in
1079 skip_trampoline_code (pc
)
1082 register unsigned int ii
, op
;
1083 CORE_ADDR solib_target_pc
;
1085 static unsigned trampoline_code
[] = {
1086 0x800b0000, /* l r0,0x0(r11) */
1087 0x90410014, /* st r2,0x14(r1) */
1088 0x7c0903a6, /* mtctr r0 */
1089 0x804b0004, /* l r2,0x4(r11) */
1090 0x816b0008, /* l r11,0x8(r11) */
1091 0x4e800420, /* bctr */
1092 0x4e800020, /* br */
1096 /* If pc is in a shared library trampoline, return its target. */
1097 solib_target_pc
= find_solib_trampoline_target (pc
);
1098 if (solib_target_pc
)
1099 return solib_target_pc
;
1101 for (ii
=0; trampoline_code
[ii
]; ++ii
) {
1102 op
= read_memory_integer (pc
+ (ii
*4), 4);
1103 if (op
!= trampoline_code
[ii
])
1106 ii
= read_register (11); /* r11 holds destination addr */
1107 pc
= read_memory_integer (ii
, 4); /* (r11) value */
1111 /* Determines whether the function FI has a frame on the stack or not. */
1114 frameless_function_invocation (fi
)
1115 struct frame_info
*fi
;
1117 CORE_ADDR func_start
;
1118 struct rs6000_framedata fdata
;
1120 /* Don't even think about framelessness except on the innermost frame
1121 or if the function was interrupted by a signal. */
1122 if (fi
->next
!= NULL
&& !fi
->next
->signal_handler_caller
)
1125 func_start
= get_pc_function_start (fi
->pc
);
1127 /* If we failed to find the start of the function, it is a mistake
1128 to inspect the instructions. */
1132 /* A frame with a zero PC is usually created by dereferencing a NULL
1133 function pointer, normally causing an immediate core dump of the
1134 inferior. Mark function as frameless, as the inferior has no chance
1135 of setting up a stack frame. */
1142 (void) skip_prologue (func_start
, &fdata
);
1143 return fdata
.frameless
;
1146 /* Return the PC saved in a frame */
1150 struct frame_info
*fi
;
1152 CORE_ADDR func_start
;
1153 struct rs6000_framedata fdata
;
1155 if (fi
->signal_handler_caller
)
1156 return read_memory_integer (fi
->frame
+ SIG_FRAME_PC_OFFSET
, 4);
1158 if (USE_GENERIC_DUMMY_FRAMES
)
1160 if (PC_IN_CALL_DUMMY (fi
->pc
, fi
->frame
, fi
->frame
))
1161 return generic_read_register_dummy(fi
->pc
, fi
->frame
, PC_REGNUM
);
1164 func_start
= get_pc_function_start (fi
->pc
);
1166 /* If we failed to find the start of the function, it is a mistake
1167 to inspect the instructions. */
1171 (void) skip_prologue (func_start
, &fdata
);
1173 if (fdata
.lr_offset
== 0 && fi
->next
!= NULL
)
1175 if (fi
->next
->signal_handler_caller
)
1176 return read_memory_integer (fi
->next
->frame
+ SIG_FRAME_LR_OFFSET
, 4);
1178 return read_memory_integer (rs6000_frame_chain (fi
) + DEFAULT_LR_SAVE
,
1182 if (fdata
.lr_offset
== 0)
1183 return read_register (LR_REGNUM
);
1185 return read_memory_integer (rs6000_frame_chain (fi
) + fdata
.lr_offset
, 4);
1188 /* If saved registers of frame FI are not known yet, read and cache them.
1189 &FDATAP contains rs6000_framedata; TDATAP can be NULL,
1190 in which case the framedata are read. */
1193 frame_get_saved_regs (fi
, fdatap
)
1194 struct frame_info
*fi
;
1195 struct rs6000_framedata
*fdatap
;
1198 CORE_ADDR frame_addr
;
1199 struct rs6000_framedata work_fdata
;
1206 fdatap
= &work_fdata
;
1207 (void) skip_prologue (get_pc_function_start (fi
->pc
), fdatap
);
1210 frame_saved_regs_zalloc (fi
);
1212 /* If there were any saved registers, figure out parent's stack
1214 /* The following is true only if the frame doesn't have a call to
1217 if (fdatap
->saved_fpr
== 0 && fdatap
->saved_gpr
== 0
1218 && fdatap
->lr_offset
== 0 && fdatap
->cr_offset
== 0)
1220 else if (fi
->prev
&& fi
->prev
->frame
)
1221 frame_addr
= fi
->prev
->frame
;
1223 frame_addr
= read_memory_integer (fi
->frame
, 4);
1225 /* if != -1, fdatap->saved_fpr is the smallest number of saved_fpr.
1226 All fpr's from saved_fpr to fp31 are saved. */
1228 if (fdatap
->saved_fpr
>= 0)
1231 int fpr_offset
= frame_addr
+ fdatap
->fpr_offset
;
1232 for (i
= fdatap
->saved_fpr
; i
< 32; i
++)
1234 fi
->saved_regs
[FP0_REGNUM
+ i
] = fpr_offset
;
1239 /* if != -1, fdatap->saved_gpr is the smallest number of saved_gpr.
1240 All gpr's from saved_gpr to gpr31 are saved. */
1242 if (fdatap
->saved_gpr
>= 0)
1245 int gpr_offset
= frame_addr
+ fdatap
->gpr_offset
;
1246 for (i
= fdatap
->saved_gpr
; i
< 32; i
++)
1248 fi
->saved_regs
[i
] = gpr_offset
;
1253 /* If != 0, fdatap->cr_offset is the offset from the frame that holds
1255 if (fdatap
->cr_offset
!= 0)
1256 fi
->saved_regs
[CR_REGNUM
] = frame_addr
+ fdatap
->cr_offset
;
1258 /* If != 0, fdatap->lr_offset is the offset from the frame that holds
1260 if (fdatap
->lr_offset
!= 0)
1261 fi
->saved_regs
[LR_REGNUM
] = frame_addr
+ fdatap
->lr_offset
;
1264 /* Return the address of a frame. This is the inital %sp value when the frame
1265 was first allocated. For functions calling alloca(), it might be saved in
1266 an alloca register. */
1269 frame_initial_stack_address (fi
)
1270 struct frame_info
*fi
;
1273 struct rs6000_framedata fdata
;
1274 struct frame_info
*callee_fi
;
1276 /* if the initial stack pointer (frame address) of this frame is known,
1279 if (fi
->extra_info
->initial_sp
)
1280 return fi
->extra_info
->initial_sp
;
1282 /* find out if this function is using an alloca register.. */
1284 (void) skip_prologue (get_pc_function_start (fi
->pc
), &fdata
);
1286 /* if saved registers of this frame are not known yet, read and cache them. */
1288 if (!fi
->saved_regs
)
1289 frame_get_saved_regs (fi
, &fdata
);
1291 /* If no alloca register used, then fi->frame is the value of the %sp for
1292 this frame, and it is good enough. */
1294 if (fdata
.alloca_reg
< 0)
1296 fi
->extra_info
->initial_sp
= fi
->frame
;
1297 return fi
->extra_info
->initial_sp
;
1300 /* This function has an alloca register. If this is the top-most frame
1301 (with the lowest address), the value in alloca register is good. */
1304 return fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1306 /* Otherwise, this is a caller frame. Callee has usually already saved
1307 registers, but there are exceptions (such as when the callee
1308 has no parameters). Find the address in which caller's alloca
1309 register is saved. */
1311 for (callee_fi
= fi
->next
; callee_fi
; callee_fi
= callee_fi
->next
) {
1313 if (!callee_fi
->saved_regs
)
1314 frame_get_saved_regs (callee_fi
, NULL
);
1316 /* this is the address in which alloca register is saved. */
1318 tmpaddr
= callee_fi
->saved_regs
[fdata
.alloca_reg
];
1320 fi
->extra_info
->initial_sp
= read_memory_integer (tmpaddr
, 4);
1321 return fi
->extra_info
->initial_sp
;
1324 /* Go look into deeper levels of the frame chain to see if any one of
1325 the callees has saved alloca register. */
1328 /* If alloca register was not saved, by the callee (or any of its callees)
1329 then the value in the register is still good. */
1331 fi
->extra_info
->initial_sp
= read_register (fdata
.alloca_reg
);
1332 return fi
->extra_info
->initial_sp
;
1336 rs6000_frame_chain (thisframe
)
1337 struct frame_info
*thisframe
;
1341 if (USE_GENERIC_DUMMY_FRAMES
)
1343 if (PC_IN_CALL_DUMMY (thisframe
->pc
, thisframe
->frame
, thisframe
->frame
))
1344 return thisframe
->frame
; /* dummy frame same as caller's frame */
1347 if (inside_entry_file (thisframe
->pc
) ||
1348 thisframe
->pc
== entry_point_address ())
1351 if (thisframe
->signal_handler_caller
)
1352 fp
= read_memory_integer (thisframe
->frame
+ SIG_FRAME_FP_OFFSET
, 4);
1353 else if (thisframe
->next
!= NULL
1354 && thisframe
->next
->signal_handler_caller
1355 && frameless_function_invocation (thisframe
))
1356 /* A frameless function interrupted by a signal did not change the
1358 fp
= FRAME_FP (thisframe
);
1360 fp
= read_memory_integer ((thisframe
)->frame
, 4);
1362 if (USE_GENERIC_DUMMY_FRAMES
)
1366 lr
= read_register (LR_REGNUM
);
1367 if (lr
== entry_point_address ())
1368 if (fp
!= 0 && (fpp
= read_memory_integer (fp
, 4)) != 0)
1369 if (PC_IN_CALL_DUMMY (lr
, fpp
, fpp
))
1376 /* Return nonzero if ADDR (a function pointer) is in the data space and
1377 is therefore a special function pointer. */
1380 is_magic_function_pointer (addr
)
1383 struct obj_section
*s
;
1385 s
= find_pc_section (addr
);
1386 if (s
&& s
->the_bfd_section
->flags
& SEC_CODE
)
1392 #ifdef GDB_TARGET_POWERPC
1394 gdb_print_insn_powerpc (memaddr
, info
)
1396 disassemble_info
*info
;
1398 if (TARGET_BYTE_ORDER
== BIG_ENDIAN
)
1399 return print_insn_big_powerpc (memaddr
, info
);
1401 return print_insn_little_powerpc (memaddr
, info
);
1406 /* Handling the various PowerPC/RS6000 variants. */
1409 /* The arrays here called register_names_MUMBLE hold names that
1410 the rs6000_register_name function returns.
1412 For each family of PPC variants, I've tried to isolate out the
1413 common registers and put them up front, so that as long as you get
1414 the general family right, GDB will correctly identify the registers
1415 common to that family. The common register sets are:
1417 For the 60x family: hid0 hid1 iabr dabr pir
1419 For the 505 and 860 family: eie eid nri
1421 For the 403 and 403GC: icdbdr esr dear evpr cdbcr tsr tcr pit tbhi
1422 tblo srr2 srr3 dbsr dbcr iac1 iac2 dac1 dac2 dccr iccr pbl1
1425 Most of these register groups aren't anything formal. I arrived at
1426 them by looking at the registers that occurred in more than one
1429 /* UISA register names common across all architectures, including POWER. */
1431 #define COMMON_UISA_REG_NAMES \
1432 /* 0 */ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
1433 /* 8 */ "r8", "r9", "r10","r11","r12","r13","r14","r15", \
1434 /* 16 */ "r16","r17","r18","r19","r20","r21","r22","r23", \
1435 /* 24 */ "r24","r25","r26","r27","r28","r29","r30","r31", \
1436 /* 32 */ "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
1437 /* 40 */ "f8", "f9", "f10","f11","f12","f13","f14","f15", \
1438 /* 48 */ "f16","f17","f18","f19","f20","f21","f22","f23", \
1439 /* 56 */ "f24","f25","f26","f27","f28","f29","f30","f31", \
1442 /* UISA-level SPR names for PowerPC. */
1443 #define PPC_UISA_SPR_NAMES \
1444 /* 66 */ "cr", "lr", "ctr", "xer", ""
1446 /* Segment register names, for PowerPC. */
1447 #define PPC_SEGMENT_REG_NAMES \
1448 /* 71 */ "sr0", "sr1", "sr2", "sr3", "sr4", "sr5", "sr6", "sr7", \
1449 /* 79 */ "sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15"
1451 /* OEA SPR names for 32-bit PowerPC implementations.
1452 The blank space is for "asr", which is only present on 64-bit
1454 #define PPC_32_OEA_SPR_NAMES \
1456 /* 88 */ "ibat0u", "ibat0l", "ibat1u", "ibat1l", \
1457 /* 92 */ "ibat2u", "ibat2l", "ibat3u", "ibat3l", \
1458 /* 96 */ "dbat0u", "dbat0l", "dbat1u", "dbat1l", \
1459 /* 100 */ "dbat2u", "dbat2l", "dbat3u", "dbat3l", \
1460 /* 104 */ "sdr1", "", "dar", "dsisr", "sprg0", "sprg1", "sprg2", "sprg3",\
1461 /* 112 */ "srr0", "srr1", "tbl", "tbu", "dec", "dabr", "ear"
1463 /* For the RS6000, we only cover user-level SPR's. */
1464 char *register_names_rs6000
[] =
1466 COMMON_UISA_REG_NAMES
,
1467 /* 66 */ "cnd", "lr", "cnt", "xer", "mq"
1470 /* a UISA-only view of the PowerPC. */
1471 char *register_names_uisa
[] =
1473 COMMON_UISA_REG_NAMES
,
1477 char *register_names_403
[] =
1479 COMMON_UISA_REG_NAMES
,
1481 PPC_SEGMENT_REG_NAMES
,
1482 PPC_32_OEA_SPR_NAMES
,
1483 /* 119 */ "icdbdr", "esr", "dear", "evpr", "cdbcr", "tsr", "tcr", "pit",
1484 /* 127 */ "tbhi", "tblo", "srr2", "srr3", "dbsr", "dbcr", "iac1", "iac2",
1485 /* 135 */ "dac1", "dac2", "dccr", "iccr", "pbl1", "pbu1", "pbl2", "pbu2"
1488 char *register_names_403GC
[] =
1490 COMMON_UISA_REG_NAMES
,
1492 PPC_SEGMENT_REG_NAMES
,
1493 PPC_32_OEA_SPR_NAMES
,
1494 /* 119 */ "icdbdr", "esr", "dear", "evpr", "cdbcr", "tsr", "tcr", "pit",
1495 /* 127 */ "tbhi", "tblo", "srr2", "srr3", "dbsr", "dbcr", "iac1", "iac2",
1496 /* 135 */ "dac1", "dac2", "dccr", "iccr", "pbl1", "pbu1", "pbl2", "pbu2",
1497 /* 143 */ "zpr", "pid", "sgr", "dcwr", "tbhu", "tblu"
1500 char *register_names_505
[] =
1502 COMMON_UISA_REG_NAMES
,
1504 PPC_SEGMENT_REG_NAMES
,
1505 PPC_32_OEA_SPR_NAMES
,
1506 /* 119 */ "eie", "eid", "nri"
1509 char *register_names_860
[] =
1511 COMMON_UISA_REG_NAMES
,
1513 PPC_SEGMENT_REG_NAMES
,
1514 PPC_32_OEA_SPR_NAMES
,
1515 /* 119 */ "eie", "eid", "nri", "cmpa", "cmpb", "cmpc", "cmpd", "icr",
1516 /* 127 */ "der", "counta", "countb", "cmpe", "cmpf", "cmpg", "cmph",
1517 /* 134 */ "lctrl1", "lctrl2", "ictrl", "bar", "ic_cst", "ic_adr", "ic_dat",
1518 /* 141 */ "dc_cst", "dc_adr", "dc_dat", "dpdr", "dpir", "immr", "mi_ctr",
1519 /* 148 */ "mi_ap", "mi_epn", "mi_twc", "mi_rpn", "md_ctr", "m_casid",
1520 /* 154 */ "md_ap", "md_epn", "md_twb", "md_twc", "md_rpn", "m_tw",
1521 /* 160 */ "mi_dbcam", "mi_dbram0", "mi_dbram1", "md_dbcam", "md_dbram0",
1522 /* 165 */ "md_dbram1"
1525 /* Note that the 601 has different register numbers for reading and
1526 writing RTCU and RTCL. However, how one reads and writes a
1527 register is the stub's problem. */
1528 char *register_names_601
[] =
1530 COMMON_UISA_REG_NAMES
,
1532 PPC_SEGMENT_REG_NAMES
,
1533 PPC_32_OEA_SPR_NAMES
,
1534 /* 119 */ "hid0", "hid1", "iabr", "dabr", "pir", "mq", "rtcu",
1538 char *register_names_602
[] =
1540 COMMON_UISA_REG_NAMES
,
1542 PPC_SEGMENT_REG_NAMES
,
1543 PPC_32_OEA_SPR_NAMES
,
1544 /* 119 */ "hid0", "hid1", "iabr", "", "", "tcr", "ibr", "esassr", "sebr",
1545 /* 128 */ "ser", "sp", "lt"
1548 char *register_names_603
[] =
1550 COMMON_UISA_REG_NAMES
,
1552 PPC_SEGMENT_REG_NAMES
,
1553 PPC_32_OEA_SPR_NAMES
,
1554 /* 119 */ "hid0", "hid1", "iabr", "", "", "dmiss", "dcmp", "hash1",
1555 /* 127 */ "hash2", "imiss", "icmp", "rpa"
1558 char *register_names_604
[] =
1560 COMMON_UISA_REG_NAMES
,
1562 PPC_SEGMENT_REG_NAMES
,
1563 PPC_32_OEA_SPR_NAMES
,
1564 /* 119 */ "hid0", "hid1", "iabr", "dabr", "pir", "mmcr0", "pmc1", "pmc2",
1565 /* 127 */ "sia", "sda"
1568 char *register_names_750
[] =
1570 COMMON_UISA_REG_NAMES
,
1572 PPC_SEGMENT_REG_NAMES
,
1573 PPC_32_OEA_SPR_NAMES
,
1574 /* 119 */ "hid0", "hid1", "iabr", "dabr", "", "ummcr0", "upmc1", "upmc2",
1575 /* 127 */ "usia", "ummcr1", "upmc3", "upmc4", "mmcr0", "pmc1", "pmc2",
1576 /* 134 */ "sia", "mmcr1", "pmc3", "pmc4", "l2cr", "ictc", "thrm1", "thrm2",
1581 /* Information about a particular processor variant. */
1584 /* Name of this variant. */
1587 /* English description of the variant. */
1590 /* Table of register names; registers[R] is the name of the register
1596 #define num_registers(list) (sizeof (list) / sizeof((list)[0]))
1599 /* Information in this table comes from the following web sites:
1600 IBM: http://www.chips.ibm.com:80/products/embedded/
1601 Motorola: http://www.mot.com/SPS/PowerPC/
1603 I'm sure I've got some of the variant descriptions not quite right.
1604 Please report any inaccuracies you find to GDB's maintainer.
1606 If you add entries to this table, please be sure to allow the new
1607 value as an argument to the --with-cpu flag, in configure.in. */
1609 static struct variant
1612 { "ppc-uisa", "PowerPC UISA - a PPC processor as viewed by user-level code",
1613 num_registers (register_names_uisa
), register_names_uisa
},
1614 { "rs6000", "IBM RS6000 (\"POWER\") architecture, user-level view",
1615 num_registers (register_names_rs6000
), register_names_rs6000
},
1616 { "403", "IBM PowerPC 403",
1617 num_registers (register_names_403
), register_names_403
},
1618 { "403GC", "IBM PowerPC 403GC",
1619 num_registers (register_names_403GC
), register_names_403GC
},
1620 { "505", "Motorola PowerPC 505",
1621 num_registers (register_names_505
), register_names_505
},
1622 { "860", "Motorola PowerPC 860 or 850",
1623 num_registers (register_names_860
), register_names_860
},
1624 { "601", "Motorola PowerPC 601",
1625 num_registers (register_names_601
), register_names_601
},
1626 { "602", "Motorola PowerPC 602",
1627 num_registers (register_names_602
), register_names_602
},
1628 { "603", "Motorola/IBM PowerPC 603 or 603e",
1629 num_registers (register_names_603
), register_names_603
},
1630 { "604", "Motorola PowerPC 604 or 604e",
1631 num_registers (register_names_604
), register_names_604
},
1632 { "750", "Motorola/IBM PowerPC 750 or 750",
1633 num_registers (register_names_750
), register_names_750
},
1638 static struct variant
*current_variant
;
1641 rs6000_register_name (int i
)
1643 if (i
< 0 || i
>= NUM_REGS
)
1644 error ("GDB bug: rs6000-tdep.c (rs6000_register_name): strange register number");
1646 return ((i
< current_variant
->num_registers
)
1647 ? current_variant
->registers
[i
]
1653 install_variant (struct variant
*v
)
1655 current_variant
= v
;
1659 /* Look up the variant named NAME in the `variants' table. Return a
1660 pointer to the struct variant, or null if we couldn't find it. */
1661 static struct variant
*
1662 find_variant_by_name (char *name
)
1666 for (i
= 0; variants
[i
].name
; i
++)
1667 if (! strcmp (name
, variants
[i
].name
))
1668 return &variants
[i
];
1674 /* Install the PPC/RS6000 variant named NAME in the `variants' table.
1675 Return zero if we installed it successfully, or a non-zero value if
1678 This might be useful to code outside this file, which doesn't want
1679 to depend on the exact indices of the entries in the `variants'
1680 table. Just make it non-static if you want that. */
1682 install_variant_by_name (char *name
)
1684 struct variant
*v
= find_variant_by_name (name
);
1688 install_variant (v
);
1701 printf_filtered ("GDB knows about the following PowerPC and RS6000 variants:\n");
1703 for (i
= 0; variants
[i
].name
; i
++)
1704 printf_filtered (" %-8s %s\n",
1705 variants
[i
].name
, variants
[i
].description
);
1710 show_current_variant ()
1712 printf_filtered ("PowerPC / RS6000 processor variant is set to `%s'.\n",
1713 current_variant
->name
);
1718 set_processor (char *arg
, int from_tty
)
1722 if (! arg
|| arg
[0] == '\0')
1728 if (install_variant_by_name (arg
))
1731 fprintf_filtered (gdb_stderr
,
1732 "`%s' is not a recognized PowerPC / RS6000 variant name.\n\n", arg
);
1734 return_to_top_level (RETURN_ERROR
);
1737 show_current_variant ();
1741 show_processor (char *arg
, int from_tty
)
1743 show_current_variant ();
1748 /* Initialization code. */
1751 _initialize_rs6000_tdep ()
1753 /* FIXME, this should not be decided via ifdef. */
1754 #ifdef GDB_TARGET_POWERPC
1755 tm_print_insn
= gdb_print_insn_powerpc
;
1757 tm_print_insn
= print_insn_rs6000
;
1760 /* I don't think we should use the set/show command arrangement
1761 here, because the way that's implemented makes it hard to do the
1762 error checking we want in a reasonable way. So we just add them
1763 as two separate commands. */
1764 add_cmd ("processor", class_support
, set_processor
,
1765 "`set processor NAME' sets the PowerPC/RS6000 variant to NAME.\n\
1766 If you set this, GDB will know about the special-purpose registers that are\n\
1767 available on the given variant.\n\
1768 Type `set processor' alone for a list of recognized variant names.",
1770 add_cmd ("processor", class_support
, show_processor
,
1771 "Show the variant of the PowerPC or RS6000 processor in use.\n\
1772 Use `set processor' to change this.",
1775 /* Set the current PPC processor variant. */
1779 #ifdef TARGET_CPU_DEFAULT
1780 status
= install_variant_by_name (TARGET_CPU_DEFAULT
);
1785 #ifdef GDB_TARGET_POWERPC
1786 install_variant_by_name ("ppc-uisa");
1788 install_variant_by_name ("rs6000");