1 /* Target-dependent code for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
27 #include "xcoffsolib.h"
29 #include <sys/param.h>
33 #include <sys/ioctl.h>
43 extern struct obstack frame_cache_obstack
;
47 /* Nonzero if we just simulated a single step break. */
50 /* Breakpoint shadows for the single step instructions will be kept here. */
52 static struct sstep_breaks
{
53 /* Address, or 0 if this is not in use. */
55 /* Shadow contents. */
59 /* Static function prototypes */
62 find_toc_address
PARAMS ((CORE_ADDR pc
));
65 branch_dest
PARAMS ((int opcode
, int instr
, CORE_ADDR pc
, CORE_ADDR safety
));
68 frame_get_cache_fsr
PARAMS ((struct frame_info
*fi
,
69 struct aix_framedata
*fdatap
));
72 * Calculate the destination of a branch/jump. Return -1 if not a branch.
75 branch_dest (opcode
, instr
, pc
, safety
)
87 absolute
= (int) ((instr
>> 1) & 1);
91 immediate
= ((instr
& ~3) << 6) >> 6; /* br unconditional */
94 if (opcode
!= 18) /* br conditional */
95 immediate
= ((instr
& ~3) << 16) >> 16;
99 dest
= pc
+ immediate
;
103 ext_op
= (instr
>>1) & 0x3ff;
105 if (ext_op
== 16) /* br conditional register */
106 dest
= read_register (LR_REGNUM
) & ~3;
108 else if (ext_op
== 528) /* br cond to count reg */
109 dest
= read_register (CTR_REGNUM
) & ~3;
116 return (dest
< TEXT_SEGMENT_BASE
) ? safety
: dest
;
121 /* AIX does not support PT_STEP. Simulate it. */
127 #define INSNLEN(OPCODE) 4
129 static char breakp
[] = BREAKPOINT
;
138 read_memory (loc
, (char *) &insn
, 4);
140 breaks
[0] = loc
+ INSNLEN(insn
);
142 breaks
[1] = branch_dest (opcode
, insn
, loc
, breaks
[0]);
144 /* Don't put two breakpoints on the same address. */
145 if (breaks
[1] == breaks
[0])
148 stepBreaks
[1].address
= 0;
150 for (ii
=0; ii
< 2; ++ii
) {
152 /* ignore invalid breakpoint. */
153 if ( breaks
[ii
] == -1)
156 read_memory (breaks
[ii
], stepBreaks
[ii
].data
, 4);
158 write_memory (breaks
[ii
], breakp
, 4);
159 stepBreaks
[ii
].address
= breaks
[ii
];
165 /* remove step breakpoints. */
166 for (ii
=0; ii
< 2; ++ii
)
167 if (stepBreaks
[ii
].address
!= 0)
169 (stepBreaks
[ii
].address
, stepBreaks
[ii
].data
, 4);
173 errno
= 0; /* FIXME, don't ignore errors! */
174 /* What errors? {read,write}_memory call error(). */
178 /* return pc value after skipping a function prologue. */
184 unsigned int op
; /* FIXME, assumes instruction size matches host int!!! */
186 if (target_read_memory (pc
, (char *)&op
, sizeof (op
)))
187 return pc
; /* Can't access it -- assume no prologue. */
188 SWAP_TARGET_AND_HOST (&op
, sizeof (op
));
190 /* Assume that subsequent fetches can fail with low probability. */
192 if (op
== 0x7c0802a6) { /* mflr r0 */
194 op
= read_memory_integer (pc
, 4);
197 if ((op
& 0xfc00003e) == 0x7c000026) { /* mfcr Rx */
199 op
= read_memory_integer (pc
, 4);
202 if ((op
& 0xfc000000) == 0x48000000) { /* bl foo, to save fprs??? */
204 op
= read_memory_integer (pc
, 4);
206 /* At this point, make sure this is not a trampoline function
207 (a function that simply calls another functions, and nothing else).
208 If the next is not a nop, this branch was part of the function
211 if (op
== 0x4def7b82 || /* crorc 15, 15, 15 */
213 return pc
- 4; /* don't skip over this branch */
216 if ((op
& 0xfc1f0000) == 0xd8010000) { /* stfd Rx,NUM(r1) */
217 pc
+= 4; /* store floating register double */
218 op
= read_memory_integer (pc
, 4);
221 if ((op
& 0xfc1f0000) == 0xbc010000) { /* stm Rx, NUM(r1) */
223 op
= read_memory_integer (pc
, 4);
226 while (((tmp
= op
>> 16) == 0x9001) || /* st r0, NUM(r1) */
227 (tmp
== 0x9421) || /* stu r1, NUM(r1) */
228 (tmp
== 0x93e1)) /* st r31,NUM(r1) */
231 op
= read_memory_integer (pc
, 4);
234 while ((tmp
= (op
>> 22)) == 0x20f) { /* l r31, ... or */
235 pc
+= 4; /* l r30, ... */
236 op
= read_memory_integer (pc
, 4);
239 /* store parameters into stack */
241 (op
& 0xfc1f0000) == 0xd8010000 || /* stfd Rx,NUM(r1) */
242 (op
& 0xfc1f0000) == 0x90010000 || /* st r?, NUM(r1) */
243 (op
& 0xfc000000) == 0xfc000000 || /* frsp, fp?, .. */
244 (op
& 0xd0000000) == 0xd0000000) /* stfs, fp?, .. */
246 pc
+= 4; /* store fpr double */
247 op
= read_memory_integer (pc
, 4);
250 if (op
== 0x603f0000) { /* oril r31, r1, 0x0 */
251 pc
+= 4; /* this happens if r31 is used as */
252 op
= read_memory_integer (pc
, 4); /* frame ptr. (gcc does that) */
255 while ((op
>> 16) == (0x907f + tmp
)) { /* st r3, NUM(r31) */
256 pc
+= 4; /* st r4, NUM(r31), ... */
257 op
= read_memory_integer (pc
, 4);
262 /* I have problems with skipping over __main() that I need to address
263 * sometime. Previously, I used to use misc_function_vector which
264 * didn't work as well as I wanted to be. -MGO */
266 /* If the first thing after skipping a prolog is a branch to a function,
267 this might be a call to an initializer in main(), introduced by gcc2.
268 We'd like to skip over it as well. Fortunately, xlc does some extra
269 work before calling a function right after a prologue, thus we can
270 single out such gcc2 behaviour. */
273 if ((op
& 0xfc000001) == 0x48000001) { /* bl foo, an initializer function? */
274 op
= read_memory_integer (pc
+4, 4);
276 if (op
== 0x4def7b82) { /* cror 0xf, 0xf, 0xf (nop) */
278 /* check and see if we are in main. If so, skip over this initializer
281 tmp
= find_pc_misc_function (pc
);
282 if (tmp
>= 0 && STREQ (misc_function_vector
[tmp
].name
, "main"))
292 /*************************************************************************
293 Support for creating pushind a dummy frame into the stack, and popping
295 *************************************************************************/
297 /* The total size of dummy frame is 436, which is;
302 and 24 extra bytes for the callee's link area. The last 24 bytes
303 for the link area might not be necessary, since it will be taken
304 care of by push_arguments(). */
306 #define DUMMY_FRAME_SIZE 436
308 #define DUMMY_FRAME_ADDR_SIZE 10
310 /* Make sure you initialize these in somewhere, in case gdb gives up what it
311 was debugging and starts debugging something else. FIXMEibm */
313 static int dummy_frame_count
= 0;
314 static int dummy_frame_size
= 0;
315 static CORE_ADDR
*dummy_frame_addr
= 0;
317 extern int stop_stack_dummy
;
319 /* push a dummy frame into stack, save all register. Currently we are saving
320 only gpr's and fpr's, which is not good enough! FIXMEmgo */
330 /* Same thing, target byte order. */
335 target_fetch_registers (-1);
337 if (dummy_frame_count
>= dummy_frame_size
) {
338 dummy_frame_size
+= DUMMY_FRAME_ADDR_SIZE
;
339 if (dummy_frame_addr
)
340 dummy_frame_addr
= (CORE_ADDR
*) xrealloc
341 (dummy_frame_addr
, sizeof(CORE_ADDR
) * (dummy_frame_size
));
343 dummy_frame_addr
= (CORE_ADDR
*)
344 xmalloc (sizeof(CORE_ADDR
) * (dummy_frame_size
));
347 sp
= read_register(SP_REGNUM
);
348 pc
= read_register(PC_REGNUM
);
349 memcpy (pc_targ
, (char *) &pc
, 4);
351 dummy_frame_addr
[dummy_frame_count
++] = sp
;
353 /* Be careful! If the stack pointer is not decremented first, then kernel
354 thinks he is free to use the space underneath it. And kernel actually
355 uses that area for IPC purposes when executing ptrace(2) calls. So
356 before writing register values into the new frame, decrement and update
357 %sp first in order to secure your frame. */
359 write_register (SP_REGNUM
, sp
-DUMMY_FRAME_SIZE
);
361 /* gdb relies on the state of current_frame. We'd better update it,
362 otherwise things like do_registers_info() wouldn't work properly! */
364 flush_cached_frames ();
365 set_current_frame (create_new_frame (sp
-DUMMY_FRAME_SIZE
, pc
));
367 /* save program counter in link register's space. */
368 write_memory (sp
+8, pc_targ
, 4);
370 /* save all floating point and general purpose registers here. */
373 for (ii
= 0; ii
< 32; ++ii
)
374 write_memory (sp
-8-(ii
*8), ®isters
[REGISTER_BYTE (31-ii
+FP0_REGNUM
)], 8);
377 for (ii
=1; ii
<=32; ++ii
)
378 write_memory (sp
-256-(ii
*4), ®isters
[REGISTER_BYTE (32-ii
)], 4);
380 /* so far, 32*2 + 32 words = 384 bytes have been written.
381 7 extra registers in our register set: pc, ps, cnd, lr, cnt, xer, mq */
383 for (ii
=1; ii
<= (LAST_SP_REGNUM
-FIRST_SP_REGNUM
+1); ++ii
) {
384 write_memory (sp
-384-(ii
*4),
385 ®isters
[REGISTER_BYTE (FPLAST_REGNUM
+ ii
)], 4);
388 /* Save sp or so called back chain right here. */
389 write_memory (sp
-DUMMY_FRAME_SIZE
, &sp
, 4);
390 sp
-= DUMMY_FRAME_SIZE
;
392 /* And finally, this is the back chain. */
393 write_memory (sp
+8, pc_targ
, 4);
397 /* Pop a dummy frame.
399 In rs6000 when we push a dummy frame, we save all of the registers. This
400 is usually done before user calls a function explicitly.
402 After a dummy frame is pushed, some instructions are copied into stack,
403 and stack pointer is decremented even more. Since we don't have a frame
404 pointer to get back to the parent frame of the dummy, we start having
405 trouble poping it. Therefore, we keep a dummy frame stack, keeping
406 addresses of dummy frames as such. When poping happens and when we
407 detect that was a dummy frame, we pop it back to its parent by using
408 dummy frame stack (`dummy_frame_addr' array).
410 FIXME: This whole concept is broken. You should be able to detect
411 a dummy stack frame *on the user's stack itself*. When you do,
412 then you know the format of that stack frame -- including its
413 saved SP register! There should *not* be a separate stack in the
414 GDB process that keeps track of these dummy frames! -- gnu@cygnus.com Aug92
421 sp
= dummy_frame_addr
[--dummy_frame_count
];
423 /* restore all fpr's. */
424 for (ii
= 1; ii
<= 32; ++ii
)
425 read_memory (sp
-(ii
*8), ®isters
[REGISTER_BYTE (32-ii
+FP0_REGNUM
)], 8);
427 /* restore all gpr's */
428 for (ii
=1; ii
<= 32; ++ii
) {
429 read_memory (sp
-256-(ii
*4), ®isters
[REGISTER_BYTE (32-ii
)], 4);
432 /* restore the rest of the registers. */
433 for (ii
=1; ii
<=(LAST_SP_REGNUM
-FIRST_SP_REGNUM
+1); ++ii
)
434 read_memory (sp
-384-(ii
*4),
435 ®isters
[REGISTER_BYTE (FPLAST_REGNUM
+ ii
)], 4);
437 read_memory (sp
-(DUMMY_FRAME_SIZE
-8),
438 ®isters
[REGISTER_BYTE(PC_REGNUM
)], 4);
440 /* when a dummy frame was being pushed, we had to decrement %sp first, in
441 order to secure astack space. Thus, saved %sp (or %r1) value, is not the
442 one we should restore. Change it with the one we need. */
444 *(int*)®isters
[REGISTER_BYTE(FP_REGNUM
)] = sp
;
446 /* Now we can restore all registers. */
448 target_store_registers (-1);
450 flush_cached_frames ();
451 set_current_frame (create_new_frame (sp
, pc
));
455 /* pop the innermost frame, go back to the caller. */
460 CORE_ADDR pc
, lr
, sp
, prev_sp
; /* %pc, %lr, %sp */
461 struct aix_framedata fdata
;
462 FRAME fr
= get_current_frame ();
468 if (stop_stack_dummy
&& dummy_frame_count
) {
473 /* figure out previous %pc value. If the function is frameless, it is
474 still in the link register, otherwise walk the frames and retrieve the
475 saved %pc value in the previous frame. */
477 addr
= get_pc_function_start (fr
->pc
) + FUNCTION_START_OFFSET
;
478 function_frame_info (addr
, &fdata
);
480 prev_sp
= read_memory_integer (sp
, 4);
482 lr
= read_register (LR_REGNUM
);
484 lr
= read_memory_integer (prev_sp
+8, 4);
486 /* reset %pc value. */
487 write_register (PC_REGNUM
, lr
);
489 /* reset register values if any was saved earlier. */
490 addr
= prev_sp
- fdata
.offset
;
492 if (fdata
.saved_gpr
!= -1)
493 for (ii
=fdata
.saved_gpr
; ii
<= 31; ++ii
) {
494 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
)], 4);
498 if (fdata
.saved_fpr
!= -1)
499 for (ii
=fdata
.saved_fpr
; ii
<= 31; ++ii
) {
500 read_memory (addr
, ®isters
[REGISTER_BYTE (ii
+FP0_REGNUM
)], 8);
504 write_register (SP_REGNUM
, prev_sp
);
505 target_store_registers (-1);
506 flush_cached_frames ();
507 set_current_frame (create_new_frame (prev_sp
, lr
));
511 /* fixup the call sequence of a dummy function, with the real function address.
512 its argumets will be passed by gdb. */
515 fix_call_dummy(dummyname
, pc
, fun
, nargs
, type
)
519 int nargs
; /* not used */
520 int type
; /* not used */
522 #define TOC_ADDR_OFFSET 20
523 #define TARGET_ADDR_OFFSET 28
526 CORE_ADDR target_addr
;
530 tocvalue
= find_toc_address (target_addr
);
532 ii
= *(int*)((char*)dummyname
+ TOC_ADDR_OFFSET
);
533 ii
= (ii
& 0xffff0000) | (tocvalue
>> 16);
534 *(int*)((char*)dummyname
+ TOC_ADDR_OFFSET
) = ii
;
536 ii
= *(int*)((char*)dummyname
+ TOC_ADDR_OFFSET
+4);
537 ii
= (ii
& 0xffff0000) | (tocvalue
& 0x0000ffff);
538 *(int*)((char*)dummyname
+ TOC_ADDR_OFFSET
+4) = ii
;
540 ii
= *(int*)((char*)dummyname
+ TARGET_ADDR_OFFSET
);
541 ii
= (ii
& 0xffff0000) | (target_addr
>> 16);
542 *(int*)((char*)dummyname
+ TARGET_ADDR_OFFSET
) = ii
;
544 ii
= *(int*)((char*)dummyname
+ TARGET_ADDR_OFFSET
+4);
545 ii
= (ii
& 0xffff0000) | (target_addr
& 0x0000ffff);
546 *(int*)((char*)dummyname
+ TARGET_ADDR_OFFSET
+4) = ii
;
550 /* return information about a function frame.
551 in struct aix_frameinfo fdata:
552 - frameless is TRUE, if function does not have a frame.
553 - nosavedpc is TRUE, if function does not save %pc value in its frame.
554 - offset is the number of bytes used in the frame to save registers.
555 - saved_gpr is the number of the first saved gpr.
556 - saved_fpr is the number of the first saved fpr.
557 - alloca_reg is the number of the register used for alloca() handling.
561 function_frame_info (pc
, fdata
)
563 struct aix_framedata
*fdata
;
566 register unsigned int op
;
569 fdata
->saved_gpr
= fdata
->saved_fpr
= fdata
->alloca_reg
= -1;
570 fdata
->frameless
= 1;
572 op
= read_memory_integer (pc
, 4);
573 if (op
== 0x7c0802a6) { /* mflr r0 */
575 op
= read_memory_integer (pc
, 4);
576 fdata
->nosavedpc
= 0;
577 fdata
->frameless
= 0;
579 else /* else, pc is not saved */
580 fdata
->nosavedpc
= 1;
582 if ((op
& 0xfc00003e) == 0x7c000026) { /* mfcr Rx */
584 op
= read_memory_integer (pc
, 4);
585 fdata
->frameless
= 0;
588 if ((op
& 0xfc000000) == 0x48000000) { /* bl foo, to save fprs??? */
590 op
= read_memory_integer (pc
, 4);
591 /* At this point, make sure this is not a trampoline function
592 (a function that simply calls another functions, and nothing else).
593 If the next is not a nop, this branch was part of the function
596 if (op
== 0x4def7b82 || /* crorc 15, 15, 15 */
598 return; /* prologue is over */
599 fdata
->frameless
= 0;
602 if ((op
& 0xfc1f0000) == 0xd8010000) { /* stfd Rx,NUM(r1) */
603 pc
+= 4; /* store floating register double */
604 op
= read_memory_integer (pc
, 4);
605 fdata
->frameless
= 0;
608 if ((op
& 0xfc1f0000) == 0xbc010000) { /* stm Rx, NUM(r1) */
610 fdata
->saved_gpr
= (op
>> 21) & 0x1f;
613 tmp2
= (~0 &~ 0xffff) | tmp2
;
617 fdata
->saved_fpr
= (tmp2
- ((32 - fdata
->saved_gpr
) * 4)) / 8;
618 if ( fdata
->saved_fpr
> 0)
619 fdata
->saved_fpr
= 32 - fdata
->saved_fpr
;
621 fdata
->saved_fpr
= -1;
623 fdata
->offset
= tmp2
;
625 op
= read_memory_integer (pc
, 4);
626 fdata
->frameless
= 0;
629 while (((tmp
= op
>> 16) == 0x9001) || /* st r0, NUM(r1) */
630 (tmp
== 0x9421) || /* stu r1, NUM(r1) */
631 (tmp
== 0x93e1)) /* st r31, NUM(r1) */
635 /* gcc takes a short cut and uses this instruction to save r31 only. */
639 /* fatal ("Unrecognized prolog."); */
640 printf ("Unrecognized prolog!\n");
642 fdata
->saved_gpr
= 31;
645 tmp2
= - ((~0 &~ 0xffff) | tmp2
);
646 fdata
->saved_fpr
= (tmp2
- ((32 - 31) * 4)) / 8;
647 if ( fdata
->saved_fpr
> 0)
648 fdata
->saved_fpr
= 32 - fdata
->saved_fpr
;
650 fdata
->saved_fpr
= -1;
652 fdata
->offset
= tmp2
;
655 op
= read_memory_integer (pc
, 4);
656 fdata
->frameless
= 0;
659 while ((tmp
= (op
>> 22)) == 0x20f) { /* l r31, ... or */
660 pc
+= 4; /* l r30, ... */
661 op
= read_memory_integer (pc
, 4);
662 fdata
->frameless
= 0;
665 /* store parameters into stack */
667 (op
& 0xfc1f0000) == 0xd8010000 || /* stfd Rx,NUM(r1) */
668 (op
& 0xfc1f0000) == 0x90010000 || /* st r?, NUM(r1) */
669 (op
& 0xfc000000) == 0xfc000000 || /* frsp, fp?, .. */
670 (op
& 0xd0000000) == 0xd0000000) /* stfs, fp?, .. */
672 pc
+= 4; /* store fpr double */
673 op
= read_memory_integer (pc
, 4);
674 fdata
->frameless
= 0;
677 if (op
== 0x603f0000) { /* oril r31, r1, 0x0 */
678 fdata
->alloca_reg
= 31;
679 fdata
->frameless
= 0;
684 /* Pass the arguments in either registers, or in the stack. In RS6000, the first
685 eight words of the argument list (that might be less than eight parameters if
686 some parameters occupy more than one word) are passed in r3..r11 registers.
687 float and double parameters are passed in fpr's, in addition to that. Rest of
688 the parameters if any are passed in user stack. There might be cases in which
689 half of the parameter is copied into registers, the other half is pushed into
692 If the function is returning a structure, then the return address is passed
693 in r3, then the first 7 words of the parametes can be passed in registers,
697 push_arguments (nargs
, args
, sp
, struct_return
, struct_addr
)
702 CORE_ADDR struct_addr
;
705 int argno
; /* current argument number */
706 int argbytes
; /* current argument byte */
707 char tmp_buffer
[50];
709 int f_argno
= 0; /* current floating point argno */
711 CORE_ADDR saved_sp
, pc
;
713 if ( dummy_frame_count
<= 0)
714 printf ("FATAL ERROR -push_arguments()! frame not found!!\n");
716 /* The first eight words of ther arguments are passed in registers. Copy
719 If the function is returning a `struct', then the first word (which
720 will be passed in r3) is used for struct return address. In that
721 case we should advance one word and start from r4 register to copy
724 ii
= struct_return
? 1 : 0;
726 for (argno
=0, argbytes
=0; argno
< nargs
&& ii
<8; ++ii
) {
728 arg
= value_arg_coerce (args
[argno
]);
729 len
= TYPE_LENGTH (VALUE_TYPE (arg
));
731 if (TYPE_CODE (VALUE_TYPE (arg
)) == TYPE_CODE_FLT
) {
733 /* floating point arguments are passed in fpr's, as well as gpr's.
734 There are 13 fpr's reserved for passing parameters. At this point
735 there is no way we would run out of them. */
739 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
741 bcopy (VALUE_CONTENTS (arg
),
742 ®isters
[REGISTER_BYTE(FP0_REGNUM
+ 1 + f_argno
)], len
);
748 /* Argument takes more than one register. */
749 while (argbytes
< len
) {
751 *(int*)®isters
[REGISTER_BYTE(ii
+3)] = 0;
752 bcopy ( ((char*)VALUE_CONTENTS (arg
))+argbytes
,
753 ®isters
[REGISTER_BYTE(ii
+3)],
754 (len
- argbytes
) > 4 ? 4 : len
- argbytes
);
758 goto ran_out_of_registers_for_arguments
;
763 else { /* Argument can fit in one register. No problem. */
764 *(int*)®isters
[REGISTER_BYTE(ii
+3)] = 0;
765 bcopy (VALUE_CONTENTS (arg
), ®isters
[REGISTER_BYTE(ii
+3)], len
);
770 ran_out_of_registers_for_arguments
:
772 /* location for 8 parameters are always reserved. */
775 /* another six words for back chain, TOC register, link register, etc. */
778 /* if there are more arguments, allocate space for them in
779 the stack, then push them starting from the ninth one. */
781 if ((argno
< nargs
) || argbytes
) {
786 space
+= ((len
- argbytes
+ 3) & -4);
792 for (; jj
< nargs
; ++jj
) {
793 val
= value_arg_coerce (args
[jj
]);
794 space
+= ((TYPE_LENGTH (VALUE_TYPE (val
))) + 3) & -4;
797 /* add location required for the rest of the parameters */
798 space
= (space
+ 7) & -8;
801 /* This is another instance we need to be concerned about securing our
802 stack space. If we write anything underneath %sp (r1), we might conflict
803 with the kernel who thinks he is free to use this area. So, update %sp
804 first before doing anything else. */
806 write_register (SP_REGNUM
, sp
);
808 /* if the last argument copied into the registers didn't fit there
809 completely, push the rest of it into stack. */
813 sp
+24+(ii
*4), ((char*)VALUE_CONTENTS (arg
))+argbytes
, len
- argbytes
);
815 ii
+= ((len
- argbytes
+ 3) & -4) / 4;
818 /* push the rest of the arguments into stack. */
819 for (; argno
< nargs
; ++argno
) {
821 arg
= value_arg_coerce (args
[argno
]);
822 len
= TYPE_LENGTH (VALUE_TYPE (arg
));
825 /* float types should be passed in fpr's, as well as in the stack. */
826 if (TYPE_CODE (VALUE_TYPE (arg
)) == TYPE_CODE_FLT
&& f_argno
< 13) {
830 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno
);
832 bcopy (VALUE_CONTENTS (arg
),
833 ®isters
[REGISTER_BYTE(FP0_REGNUM
+ 1 + f_argno
)], len
);
837 write_memory (sp
+24+(ii
*4), (char *) VALUE_CONTENTS (arg
), len
);
838 ii
+= ((len
+ 3) & -4) / 4;
842 /* Secure stack areas first, before doing anything else. */
843 write_register (SP_REGNUM
, sp
);
845 saved_sp
= dummy_frame_addr
[dummy_frame_count
- 1];
846 read_memory (saved_sp
, tmp_buffer
, 24);
847 write_memory (sp
, tmp_buffer
, 24);
849 write_memory (sp
, &saved_sp
, 4); /* set back chain properly */
851 target_store_registers (-1);
855 /* a given return value in `regbuf' with a type `valtype', extract and copy its
856 value into `valbuf' */
859 extract_return_value (valtype
, regbuf
, valbuf
)
860 struct type
*valtype
;
861 char regbuf
[REGISTER_BYTES
];
865 if (TYPE_CODE (valtype
) == TYPE_CODE_FLT
) {
868 /* floats and doubles are returned in fpr1. fpr's have a size of 8 bytes.
869 We need to truncate the return value into float size (4 byte) if
872 if (TYPE_LENGTH (valtype
) > 4) /* this is a double */
873 bcopy (®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)], valbuf
,
874 TYPE_LENGTH (valtype
));
876 bcopy (®buf
[REGISTER_BYTE (FP0_REGNUM
+ 1)], &dd
, 8);
878 bcopy (&ff
, valbuf
, sizeof(float));
882 /* return value is copied starting from r3. */
883 bcopy (®buf
[REGISTER_BYTE (3)], valbuf
, TYPE_LENGTH (valtype
));
887 /* keep structure return address in this variable.
888 FIXME: This is a horrid kludge which should not be allowed to continue
889 living. This only allows a single nested call to a structure-returning
890 function. Come on, guys! -- gnu@cygnus.com, Aug 92 */
892 CORE_ADDR rs6000_struct_return_address
;
895 /* Indirect function calls use a piece of trampoline code to do context
896 switching, i.e. to set the new TOC table. Skip such code if we are on
897 its first instruction (as when we have single-stepped to here).
898 Result is desired PC to step until, or NULL if we are not in
902 skip_trampoline_code (pc
)
905 register unsigned int ii
, op
;
907 static unsigned trampoline_code
[] = {
908 0x800b0000, /* l r0,0x0(r11) */
909 0x90410014, /* st r2,0x14(r1) */
910 0x7c0903a6, /* mtctr r0 */
911 0x804b0004, /* l r2,0x4(r11) */
912 0x816b0008, /* l r11,0x8(r11) */
913 0x4e800420, /* bctr */
918 for (ii
=0; trampoline_code
[ii
]; ++ii
) {
919 op
= read_memory_integer (pc
+ (ii
*4), 4);
920 if (op
!= trampoline_code
[ii
])
923 ii
= read_register (11); /* r11 holds destination addr */
924 pc
= read_memory_integer (ii
, 4); /* (r11) value */
929 /* Determines whether the function FI has a frame on the stack or not.
930 Called from the FRAMELESS_FUNCTION_INVOCATION macro in tm.h with a
931 second argument of 0, and from the FRAME_SAVED_PC macro with a
932 second argument of 1. */
935 frameless_function_invocation (fi
, pcsaved
)
936 struct frame_info
*fi
;
939 CORE_ADDR func_start
;
940 struct aix_framedata fdata
;
942 if (fi
->next
!= NULL
)
943 /* Don't even think about framelessness except on the innermost frame. */
946 func_start
= get_pc_function_start (fi
->pc
) + FUNCTION_START_OFFSET
;
948 /* If we failed to find the start of the function, it is a mistake
949 to inspect the instructions. */
954 function_frame_info (func_start
, &fdata
);
955 return pcsaved
? fdata
.nosavedpc
: fdata
.frameless
;
959 /* If saved registers of frame FI are not known yet, read and cache them.
960 &FDATAP contains aix_framedata; TDATAP can be NULL,
961 in which case the framedata are read. */
964 frame_get_cache_fsr (fi
, fdatap
)
965 struct frame_info
*fi
;
966 struct aix_framedata
*fdatap
;
969 CORE_ADDR frame_addr
;
970 struct aix_framedata work_fdata
;
975 if (fdatap
== NULL
) {
976 fdatap
= &work_fdata
;
977 function_frame_info (get_pc_function_start (fi
->pc
), fdatap
);
980 fi
->cache_fsr
= (struct frame_saved_regs
*)
981 obstack_alloc (&frame_cache_obstack
, sizeof (struct frame_saved_regs
));
982 bzero (fi
->cache_fsr
, sizeof (struct frame_saved_regs
));
984 if (fi
->prev
&& fi
->prev
->frame
)
985 frame_addr
= fi
->prev
->frame
;
987 frame_addr
= read_memory_integer (fi
->frame
, 4);
989 /* if != -1, fdatap->saved_fpr is the smallest number of saved_fpr.
990 All fpr's from saved_fpr to fp31 are saved right underneath caller
991 stack pointer, starting from fp31 first. */
993 if (fdatap
->saved_fpr
>= 0) {
994 for (ii
=31; ii
>= fdatap
->saved_fpr
; --ii
)
995 fi
->cache_fsr
->regs
[FP0_REGNUM
+ ii
] = frame_addr
- ((32 - ii
) * 8);
996 frame_addr
-= (32 - fdatap
->saved_fpr
) * 8;
999 /* if != -1, fdatap->saved_gpr is the smallest number of saved_gpr.
1000 All gpr's from saved_gpr to gpr31 are saved right under saved fprs,
1001 starting from r31 first. */
1003 if (fdatap
->saved_gpr
>= 0)
1004 for (ii
=31; ii
>= fdatap
->saved_gpr
; --ii
)
1005 fi
->cache_fsr
->regs
[ii
] = frame_addr
- ((32 - ii
) * 4);
1008 /* Return the address of a frame. This is the inital %sp value when the frame
1009 was first allocated. For functions calling alloca(), it might be saved in
1010 an alloca register. */
1013 frame_initial_stack_address (fi
)
1014 struct frame_info
*fi
;
1017 struct aix_framedata fdata
;
1018 struct frame_info
*callee_fi
;
1020 /* if the initial stack pointer (frame address) of this frame is known,
1024 return fi
->initial_sp
;
1026 /* find out if this function is using an alloca register.. */
1028 function_frame_info (get_pc_function_start (fi
->pc
), &fdata
);
1030 /* if saved registers of this frame are not known yet, read and cache them. */
1033 frame_get_cache_fsr (fi
, &fdata
);
1035 /* If no alloca register used, then fi->frame is the value of the %sp for
1036 this frame, and it is good enough. */
1038 if (fdata
.alloca_reg
< 0) {
1039 fi
->initial_sp
= fi
->frame
;
1040 return fi
->initial_sp
;
1043 /* This function has an alloca register. If this is the top-most frame
1044 (with the lowest address), the value in alloca register is good. */
1047 return fi
->initial_sp
= read_register (fdata
.alloca_reg
);
1049 /* Otherwise, this is a caller frame. Callee has usually already saved
1050 registers, but there are exceptions (such as when the callee
1051 has no parameters). Find the address in which caller's alloca
1052 register is saved. */
1054 for (callee_fi
= fi
->next
; callee_fi
; callee_fi
= callee_fi
->next
) {
1056 if (!callee_fi
->cache_fsr
)
1057 frame_get_cache_fsr (callee_fi
, NULL
);
1059 /* this is the address in which alloca register is saved. */
1061 tmpaddr
= callee_fi
->cache_fsr
->regs
[fdata
.alloca_reg
];
1063 fi
->initial_sp
= read_memory_integer (tmpaddr
, 4);
1064 return fi
->initial_sp
;
1067 /* Go look into deeper levels of the frame chain to see if any one of
1068 the callees has saved alloca register. */
1071 /* If alloca register was not saved, by the callee (or any of its callees)
1072 then the value in the register is still good. */
1074 return fi
->initial_sp
= read_register (fdata
.alloca_reg
);
1078 rs6000_frame_chain (thisframe
)
1079 struct frame_info
*thisframe
;
1082 if (inside_entry_file ((thisframe
)->pc
))
1084 if (thisframe
->signal_handler_caller
)
1086 /* This was determined by experimentation on AIX 3.2. Perhaps
1087 it corresponds to some offset in /usr/include/sys/user.h or
1088 something like that. Using some system include file would
1089 have the advantage of probably being more robust in the face
1090 of OS upgrades, but the disadvantage of being wrong for
1093 #define SIG_FRAME_FP_OFFSET 284
1094 fp
= read_memory_integer (thisframe
->frame
+ SIG_FRAME_FP_OFFSET
, 4);
1097 fp
= read_memory_integer ((thisframe
)->frame
, 4);
1103 /* xcoff_relocate_symtab - hook for symbol table relocation.
1104 also reads shared libraries.. */
1106 xcoff_relocate_symtab (pid
)
1109 #define MAX_LOAD_SEGS 64 /* maximum number of load segments */
1111 struct ld_info
*ldi
;
1114 ldi
= (void *) alloca(MAX_LOAD_SEGS
* sizeof (*ldi
));
1116 /* According to my humble theory, AIX has some timing problems and
1117 when the user stack grows, kernel doesn't update stack info in time
1118 and ptrace calls step on user stack. That is why we sleep here a little,
1119 and give kernel to update its internals. */
1124 ptrace(PT_LDINFO
, pid
, (PTRACE_ARG3_TYPE
) ldi
,
1125 MAX_LOAD_SEGS
* sizeof(*ldi
), ldi
);
1127 perror_with_name ("ptrace ldinfo");
1134 /* We are allowed to assume CORE_ADDR == pointer. This code is
1136 add_text_to_loadinfo ((CORE_ADDR
) ldi
->ldinfo_textorg
,
1137 (CORE_ADDR
) ldi
->ldinfo_dataorg
);
1138 } while (ldi
->ldinfo_next
1139 && (ldi
= (void *) (ldi
->ldinfo_next
+ (char *) ldi
)));
1142 /* Now that we've jumbled things around, re-sort them. */
1143 sort_minimal_symbols ();
1146 /* relocate the exec and core sections as well. */
1150 /* Keep an array of load segment information and their TOC table addresses.
1151 This info will be useful when calling a shared library function by hand. */
1154 CORE_ADDR textorg
, dataorg
;
1155 unsigned long toc_offset
;
1158 #define LOADINFOLEN 10
1160 static struct loadinfo
*loadinfo
= NULL
;
1161 static int loadinfolen
= 0;
1162 static int loadinfotocindex
= 0;
1163 static int loadinfotextindex
= 0;
1167 xcoff_init_loadinfo ()
1169 loadinfotocindex
= 0;
1170 loadinfotextindex
= 0;
1172 if (loadinfolen
== 0) {
1173 loadinfo
= (struct loadinfo
*)
1174 xmalloc (sizeof (struct loadinfo
) * LOADINFOLEN
);
1175 loadinfolen
= LOADINFOLEN
;
1180 /* FIXME -- this is never called! */
1188 loadinfotocindex
= 0;
1189 loadinfotextindex
= 0;
1192 /* this is called from xcoffread.c */
1195 xcoff_add_toc_to_loadinfo (unsigned long tocoff
)
1197 while (loadinfotocindex
>= loadinfolen
) {
1198 loadinfolen
+= LOADINFOLEN
;
1199 loadinfo
= (struct loadinfo
*)
1200 xrealloc (loadinfo
, sizeof(struct loadinfo
) * loadinfolen
);
1202 loadinfo
[loadinfotocindex
++].toc_offset
= tocoff
;
1207 add_text_to_loadinfo (textaddr
, dataaddr
)
1211 while (loadinfotextindex
>= loadinfolen
) {
1212 loadinfolen
+= LOADINFOLEN
;
1213 loadinfo
= (struct loadinfo
*)
1214 xrealloc (loadinfo
, sizeof(struct loadinfo
) * loadinfolen
);
1216 loadinfo
[loadinfotextindex
].textorg
= textaddr
;
1217 loadinfo
[loadinfotextindex
].dataorg
= dataaddr
;
1218 ++loadinfotextindex
;
1222 /* FIXME: This assumes that the "textorg" and "dataorg" elements
1223 of a member of this array are correlated with the "toc_offset"
1224 element of the same member. But they are sequentially assigned in wildly
1225 different places, and probably there is no correlation. FIXME! */
1228 find_toc_address (pc
)
1231 int ii
, toc_entry
, tocbase
= 0;
1233 for (ii
=0; ii
< loadinfotextindex
; ++ii
)
1234 if (pc
> loadinfo
[ii
].textorg
&& loadinfo
[ii
].textorg
> tocbase
) {
1236 tocbase
= loadinfo
[ii
].textorg
;
1239 return loadinfo
[toc_entry
].dataorg
+ loadinfo
[toc_entry
].toc_offset
;