1 /* Target-dependent code for the MIPS architecture, for GDB, the GNU Debugger.
2 Copyright 1988, 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
3 Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
4 and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
31 #include <sys/types.h>
34 #include <sys/param.h>
37 #include <sys/ioctl.h>
40 /* Must do it this way only for SGIs, as other mips platforms get their
41 JB_ symbols from machine/pcb.h (included via sys/user.h). */
51 #define MIPSMAGIC MIPSELMAGIC
53 #define MIPSMAGIC MIPSEBMAGIC
57 #define VM_MIN_ADDRESS (unsigned)0x400000
59 #include <sys/user.h> /* After a.out.h */
64 #define PROC_LOW_ADDR(proc) ((proc)->adr) /* least address */
65 #define PROC_HIGH_ADDR(proc) ((proc)->pad2) /* upper address bound */
66 #define PROC_FRAME_OFFSET(proc) ((proc)->framesize)
67 #define PROC_FRAME_REG(proc) ((proc)->framereg)
68 #define PROC_REG_MASK(proc) ((proc)->regmask)
69 #define PROC_FREG_MASK(proc) ((proc)->fregmask)
70 #define PROC_REG_OFFSET(proc) ((proc)->regoffset)
71 #define PROC_FREG_OFFSET(proc) ((proc)->fregoffset)
72 #define PROC_PC_REG(proc) ((proc)->pcreg)
73 #define PROC_SYMBOL(proc) (*(struct symbol**)&(proc)->isym)
74 #define _PROC_MAGIC_ 0x0F0F0F0F
75 #define PROC_DESC_IS_DUMMY(proc) ((proc)->isym == _PROC_MAGIC_)
76 #define SET_PROC_DESC_IS_DUMMY(proc) ((proc)->isym = _PROC_MAGIC_)
78 struct linked_proc_info
80 struct mips_extra_func_info info
;
81 struct linked_proc_info
*next
;
82 } * linked_proc_desc_table
= NULL
;
85 #define READ_FRAME_REG(fi, regno) read_next_frame_reg((fi)->next, regno)
88 read_next_frame_reg(fi
, regno
)
92 #define SIGFRAME_BASE sizeof(struct sigcontext)
93 #define SIGFRAME_PC_OFF (-SIGFRAME_BASE+ 2*sizeof(int))
94 #define SIGFRAME_SP_OFF (-SIGFRAME_BASE+32*sizeof(int))
95 #define SIGFRAME_RA_OFF (-SIGFRAME_BASE+34*sizeof(int))
96 for (; fi
; fi
= fi
->next
)
97 if (in_sigtramp(fi
->pc
, 0)) {
98 /* No idea if this code works. --PB. */
100 if (regno
== PC_REGNUM
) offset
= SIGFRAME_PC_OFF
;
101 else if (regno
== RA_REGNUM
) offset
= SIGFRAME_RA_OFF
;
102 else if (regno
== SP_REGNUM
) offset
= SIGFRAME_SP_OFF
;
104 return read_memory_integer(fi
->frame
+ offset
, 4);
106 else if (regno
== SP_REGNUM
) return fi
->frame
;
107 else if (fi
->saved_regs
->regs
[regno
])
108 return read_memory_integer(fi
->saved_regs
->regs
[regno
], 4);
109 return read_register(regno
);
113 mips_frame_saved_pc(frame
)
116 mips_extra_func_info_t proc_desc
= (mips_extra_func_info_t
)frame
->proc_desc
;
117 int pcreg
= proc_desc
? PROC_PC_REG(proc_desc
) : RA_REGNUM
;
118 if (proc_desc
&& PROC_DESC_IS_DUMMY(proc_desc
))
119 return read_memory_integer(frame
->frame
- 4, 4);
121 /* If in the procedure prologue, RA_REGNUM might not have been saved yet.
122 * Assume non-leaf functions start with:
123 * addiu $sp,$sp,-frame_size
124 * sw $ra,ra_offset($sp)
125 * This if the pc is pointing at either of these instructions,
126 * then $ra hasn't been trashed.
127 * If the pc has advanced beyond these two instructions,
128 * then $ra has been saved.
129 * critical, and much more complex. Handling $ra is enough to get
130 * a stack trace, but some register values with be wrong.
132 if (frame
->proc_desc
&& frame
->pc
< PROC_LOW_ADDR(proc_desc
) + 8)
133 return read_register(pcreg
);
135 return read_next_frame_reg(frame
, pcreg
);
138 static struct mips_extra_func_info temp_proc_desc
;
139 static struct frame_saved_regs temp_saved_regs
;
141 CORE_ADDR
heuristic_proc_start(pc
)
145 CORE_ADDR start_pc
= pc
;
146 CORE_ADDR fence
= start_pc
- 200;
147 if (fence
< VM_MIN_ADDRESS
) fence
= VM_MIN_ADDRESS
;
148 /* search back for previous return */
149 for (start_pc
-= 4; ; start_pc
-= 4)
150 if (start_pc
< fence
) return 0;
151 else if (ABOUT_TO_RETURN(start_pc
))
154 start_pc
+= 8; /* skip return, and its delay slot */
156 /* skip nops (usually 1) 0 - is this */
157 while (start_pc
< pc
&& read_memory_integer (start_pc
, 4) == 0)
163 mips_extra_func_info_t
164 heuristic_proc_desc(start_pc
, limit_pc
, next_frame
)
165 CORE_ADDR start_pc
, limit_pc
;
168 CORE_ADDR sp
= next_frame
? next_frame
->frame
: read_register (SP_REGNUM
);
171 int has_frame_reg
= 0;
172 int reg30
; /* Value of $r30. Used by gcc for frame-pointer */
173 unsigned long reg_mask
= 0;
175 if (start_pc
== 0) return NULL
;
176 bzero(&temp_proc_desc
, sizeof(temp_proc_desc
));
177 bzero(&temp_saved_regs
, sizeof(struct frame_saved_regs
));
178 if (start_pc
+ 200 < limit_pc
) limit_pc
= start_pc
+ 200;
181 for (cur_pc
= start_pc
; cur_pc
< limit_pc
; cur_pc
+= 4) {
185 status
= read_memory_nobpt (cur_pc
, &word
, 4);
186 if (status
) memory_error (status
, cur_pc
);
187 SWAP_TARGET_AND_HOST (&word
, sizeof (word
));
188 if ((word
& 0xFFFF0000) == 0x27bd0000) /* addiu $sp,$sp,-i */
189 frame_size
+= (-word
) & 0xFFFF;
190 else if ((word
& 0xFFFF0000) == 0x23bd0000) /* addu $sp,$sp,-i */
191 frame_size
+= (-word
) & 0xFFFF;
192 else if ((word
& 0xFFE00000) == 0xafa00000) { /* sw reg,offset($sp) */
193 int reg
= (word
& 0x001F0000) >> 16;
194 reg_mask
|= 1 << reg
;
195 temp_saved_regs
.regs
[reg
] = sp
+ (short)word
;
197 else if ((word
& 0xFFFF0000) == 0x27be0000) { /* addiu $30,$sp,size */
198 if ((unsigned short)word
!= frame_size
)
199 reg30
= sp
+ (unsigned short)word
;
200 else if (!has_frame_reg
) {
203 reg30
= read_next_frame_reg(next_frame
, 30);
204 alloca_adjust
= reg30
- (sp
+ (unsigned short)word
);
205 if (alloca_adjust
> 0) {
206 /* FP > SP + frame_size. This may be because
207 /* of an alloca or somethings similar.
208 * Fix sp to "pre-alloca" value, and try again.
215 else if ((word
& 0xFFE00000) == 0xafc00000) { /* sw reg,offset($30) */
216 int reg
= (word
& 0x001F0000) >> 16;
217 reg_mask
|= 1 << reg
;
218 temp_saved_regs
.regs
[reg
] = reg30
+ (short)word
;
222 PROC_FRAME_REG(&temp_proc_desc
) = 30;
223 PROC_FRAME_OFFSET(&temp_proc_desc
) = 0;
226 PROC_FRAME_REG(&temp_proc_desc
) = SP_REGNUM
;
227 PROC_FRAME_OFFSET(&temp_proc_desc
) = frame_size
;
229 PROC_REG_MASK(&temp_proc_desc
) = reg_mask
;
230 PROC_PC_REG(&temp_proc_desc
) = RA_REGNUM
;
231 return &temp_proc_desc
;
234 mips_extra_func_info_t
235 find_proc_desc(pc
, next_frame
)
239 mips_extra_func_info_t proc_desc
;
240 extern struct block
*block_for_pc();
241 struct block
*b
= block_for_pc(pc
);
244 b
? lookup_symbol(".gdbinfo.", b
, LABEL_NAMESPACE
, 0, NULL
) : NULL
;
247 /* IF this is the topmost frame AND
248 * (this proc does not have debugging information OR
249 * the PC is in the procedure prologue)
250 * THEN create a "heuristic" proc_desc (by analyzing
251 * the actual code) to replace the "official" proc_desc.
253 proc_desc
= (struct mips_extra_func_info
*)sym
->value
.value
;
254 if (next_frame
== NULL
) {
255 struct symtab_and_line val
;
256 struct symbol
*proc_symbol
=
257 PROC_DESC_IS_DUMMY(proc_desc
) ? 0 : PROC_SYMBOL(proc_desc
);
259 val
= find_pc_line (BLOCK_START
260 (SYMBOL_BLOCK_VALUE(proc_symbol
)),
262 val
.pc
= val
.end
? val
.end
: pc
;
264 if (!proc_symbol
|| pc
< val
.pc
) {
265 mips_extra_func_info_t found_heuristic
=
266 heuristic_proc_desc(PROC_LOW_ADDR(proc_desc
),
268 if (found_heuristic
) proc_desc
= found_heuristic
;
274 register struct linked_proc_info
*link
;
275 for (link
= linked_proc_desc_table
; link
; link
= link
->next
)
276 if (PROC_LOW_ADDR(&link
->info
) <= pc
277 && PROC_HIGH_ADDR(&link
->info
) > pc
)
280 heuristic_proc_desc(heuristic_proc_start(pc
), pc
, next_frame
);
285 mips_extra_func_info_t cached_proc_desc
;
287 FRAME_ADDR
mips_frame_chain(frame
)
290 mips_extra_func_info_t proc_desc
;
291 CORE_ADDR saved_pc
= FRAME_SAVED_PC(frame
);
293 if (symfile_objfile
->ei
.entry_file_lowpc
)
294 { /* has at least the __start symbol */
295 if (saved_pc
== 0 || inside_entry_file (saved_pc
)) return 0;
298 { /* This hack depends on the internals of __start. */
299 /* We also assume the breakpoints are *not* inserted */
301 || read_memory_integer (saved_pc
+ 8, 4) & 0xFC00003F == 0xD)
302 return 0; /* break */
304 proc_desc
= find_proc_desc(saved_pc
, frame
);
305 if (!proc_desc
) return 0;
306 cached_proc_desc
= proc_desc
;
307 return read_next_frame_reg(frame
, PROC_FRAME_REG(proc_desc
))
308 + PROC_FRAME_OFFSET(proc_desc
);
312 init_extra_frame_info(fci
)
313 struct frame_info
*fci
;
315 extern struct obstack frame_cache_obstack
;
316 /* Use proc_desc calculated in frame_chain */
317 mips_extra_func_info_t proc_desc
= fci
->next
? cached_proc_desc
:
318 find_proc_desc(fci
->pc
, fci
->next
);
319 fci
->saved_regs
= (struct frame_saved_regs
*)
320 obstack_alloc (&frame_cache_obstack
, sizeof(struct frame_saved_regs
));
321 bzero(fci
->saved_regs
, sizeof(struct frame_saved_regs
));
323 proc_desc
== &temp_proc_desc
? (char*)NULL
: (char*)proc_desc
;
327 CORE_ADDR reg_position
;
329 /* r0 bit means kernel trap */
330 int kernel_trap
= PROC_REG_MASK(proc_desc
) & 1;
332 /* Fixup frame-pointer - only needed for top frame */
333 /* This may not be quite right, if procedure has a real frame register */
334 if (fci
->pc
== PROC_LOW_ADDR(proc_desc
))
335 fci
->frame
= read_register (SP_REGNUM
);
337 fci
->frame
= READ_FRAME_REG(fci
, PROC_FRAME_REG(proc_desc
))
338 + PROC_FRAME_OFFSET(proc_desc
);
340 if (proc_desc
== &temp_proc_desc
)
341 *fci
->saved_regs
= temp_saved_regs
;
344 /* find which general-purpose registers were saved */
345 reg_position
= fci
->frame
+ PROC_REG_OFFSET(proc_desc
);
346 mask
= kernel_trap
? 0xFFFFFFFF : PROC_REG_MASK(proc_desc
);
347 for (ireg
= 31; mask
; --ireg
, mask
<<= 1)
348 if (mask
& 0x80000000)
350 fci
->saved_regs
->regs
[ireg
] = reg_position
;
353 /* find which floating-point registers were saved */
354 reg_position
= fci
->frame
+ PROC_FREG_OFFSET(proc_desc
);
355 /* The freg_offset points to where the first *double* register is saved.
356 * So skip to the high-order word. */
358 mask
= kernel_trap
? 0xFFFFFFFF : PROC_FREG_MASK(proc_desc
);
359 for (ireg
= 31; mask
; --ireg
, mask
<<= 1)
360 if (mask
& 0x80000000)
362 fci
->saved_regs
->regs
[FP0_REGNUM
+ireg
] = reg_position
;
367 /* hack: if argument regs are saved, guess these contain args */
368 if ((PROC_REG_MASK(proc_desc
) & 0xF0) == 0) fci
->num_args
= -1;
369 else if ((PROC_REG_MASK(proc_desc
) & 0x80) == 0) fci
->num_args
= 4;
370 else if ((PROC_REG_MASK(proc_desc
) & 0x40) == 0) fci
->num_args
= 3;
371 else if ((PROC_REG_MASK(proc_desc
) & 0x20) == 0) fci
->num_args
= 2;
372 else if ((PROC_REG_MASK(proc_desc
) & 0x10) == 0) fci
->num_args
= 1;
374 fci
->saved_regs
->regs
[PC_REGNUM
] = fci
->saved_regs
->regs
[RA_REGNUM
];
377 supply_register(FP_REGNUM
, &fci
->frame
);
381 CORE_ADDR
mips_push_arguments(nargs
, args
, sp
, struct_return
, struct_addr
)
386 CORE_ADDR struct_addr
;
390 int accumulate_size
= struct_return
? 4 : 0;
391 struct mips_arg
{ char *contents
; int len
; int offset
; };
392 struct mips_arg
*mips_args
=
393 (struct mips_arg
*)alloca(nargs
* sizeof(struct mips_arg
));
394 register struct mips_arg
*m_arg
;
395 for (i
= 0, m_arg
= mips_args
; i
< nargs
; i
++, m_arg
++) {
396 extern value
value_arg_coerce();
397 value arg
= value_arg_coerce (args
[i
]);
398 m_arg
->len
= TYPE_LENGTH (VALUE_TYPE (arg
));
399 /* This entire mips-specific routine is because doubles must be aligned
400 * on 8-byte boundaries. It still isn't quite right, because MIPS decided
401 * to align 'struct {int a, b}' on 4-byte boundaries (even though this
402 * breaks their varargs implementation...). A correct solution
403 * requires an simulation of gcc's 'alignof' (and use of 'alignof'
404 * in stdarg.h/varargs.h).
406 if (m_arg
->len
> 4) accumulate_size
= (accumulate_size
+ 7) & -8;
407 m_arg
->offset
= accumulate_size
;
408 accumulate_size
= (accumulate_size
+ m_arg
->len
+ 3) & -4;
409 m_arg
->contents
= VALUE_CONTENTS(arg
);
411 accumulate_size
= (accumulate_size
+ 7) & (-8);
412 if (accumulate_size
< 16) accumulate_size
= 16;
413 sp
-= accumulate_size
;
414 for (i
= nargs
; m_arg
--, --i
>= 0; )
415 write_memory(sp
+ m_arg
->offset
, m_arg
->contents
, m_arg
->len
);
418 write_memory(sp
, &buf
, sizeof(CORE_ADDR
));
423 /* MASK(i,j) == (1<<i) + (1<<(i+1)) + ... + (1<<j)). Assume i<=j<31. */
424 #define MASK(i,j) ((1 << (j)+1)-1 ^ (1 << (i))-1)
427 mips_push_dummy_frame()
430 struct linked_proc_info
*link
= (struct linked_proc_info
*)
431 xmalloc(sizeof(struct linked_proc_info
));
432 mips_extra_func_info_t proc_desc
= &link
->info
;
433 CORE_ADDR sp
= read_register (SP_REGNUM
);
434 CORE_ADDR save_address
;
435 REGISTER_TYPE buffer
;
436 link
->next
= linked_proc_desc_table
;
437 linked_proc_desc_table
= link
;
438 #define PUSH_FP_REGNUM 16 /* must be a register preserved across calls */
439 #define GEN_REG_SAVE_MASK MASK(1,16)|MASK(24,28)|(1<<31)
440 #define GEN_REG_SAVE_COUNT 22
441 #define FLOAT_REG_SAVE_MASK MASK(0,19)
442 #define FLOAT_REG_SAVE_COUNT 20
443 #define SPECIAL_REG_SAVE_COUNT 4
445 * The registers we must save are all those not preserved across
446 * procedure calls. Dest_Reg (see tm-mips.h) must also be saved.
447 * In addition, we must save the PC, and PUSH_FP_REGNUM.
448 * (Ideally, we should also save MDLO/-HI and FP Control/Status reg.)
450 * Dummy frame layout:
453 * Saved MMHI, MMLO, FPC_CSR
458 * Saved D18 (i.e. F19, F18)
460 * Saved D0 (i.e. F1, F0)
461 * CALL_DUMMY (subroutine stub; see m-mips.h)
462 * Parameter build area (not yet implemented)
465 PROC_REG_MASK(proc_desc
) = GEN_REG_SAVE_MASK
;
466 PROC_FREG_MASK(proc_desc
) = FLOAT_REG_SAVE_MASK
;
467 PROC_REG_OFFSET(proc_desc
) = /* offset of (Saved R31) from FP */
468 -sizeof(long) - 4 * SPECIAL_REG_SAVE_COUNT
;
469 PROC_FREG_OFFSET(proc_desc
) = /* offset of (Saved D18) from FP */
470 -sizeof(double) - 4 * (SPECIAL_REG_SAVE_COUNT
+ GEN_REG_SAVE_COUNT
);
471 /* save general registers */
472 save_address
= sp
+ PROC_REG_OFFSET(proc_desc
);
473 for (ireg
= 32; --ireg
>= 0; )
474 if (PROC_REG_MASK(proc_desc
) & (1 << ireg
))
476 buffer
= read_register (ireg
);
477 write_memory (save_address
, &buffer
, sizeof(REGISTER_TYPE
));
480 /* save floating-points registers */
481 save_address
= sp
+ PROC_FREG_OFFSET(proc_desc
);
482 for (ireg
= 32; --ireg
>= 0; )
483 if (PROC_FREG_MASK(proc_desc
) & (1 << ireg
))
485 buffer
= read_register (ireg
+ FP0_REGNUM
);
486 write_memory (save_address
, &buffer
, 4);
489 write_register (PUSH_FP_REGNUM
, sp
);
490 PROC_FRAME_REG(proc_desc
) = PUSH_FP_REGNUM
;
491 PROC_FRAME_OFFSET(proc_desc
) = 0;
492 buffer
= read_register (PC_REGNUM
);
493 write_memory (sp
- 4, &buffer
, sizeof(REGISTER_TYPE
));
494 buffer
= read_register (HI_REGNUM
);
495 write_memory (sp
- 8, &buffer
, sizeof(REGISTER_TYPE
));
496 buffer
= read_register (LO_REGNUM
);
497 write_memory (sp
- 12, &buffer
, sizeof(REGISTER_TYPE
));
498 buffer
= read_register (FCRCS_REGNUM
);
499 write_memory (sp
- 16, &buffer
, sizeof(REGISTER_TYPE
));
500 sp
-= 4 * (GEN_REG_SAVE_COUNT
+FLOAT_REG_SAVE_COUNT
+SPECIAL_REG_SAVE_COUNT
);
501 write_register (SP_REGNUM
, sp
);
502 PROC_LOW_ADDR(proc_desc
) = sp
- CALL_DUMMY_SIZE
+ CALL_DUMMY_START_OFFSET
;
503 PROC_HIGH_ADDR(proc_desc
) = sp
;
504 SET_PROC_DESC_IS_DUMMY(proc_desc
);
505 PROC_PC_REG(proc_desc
) = RA_REGNUM
;
510 { register int regnum
;
511 FRAME frame
= get_current_frame ();
512 CORE_ADDR new_sp
= frame
->frame
;
513 mips_extra_func_info_t proc_desc
= (mips_extra_func_info_t
)frame
->proc_desc
;
514 if (PROC_DESC_IS_DUMMY(proc_desc
))
516 struct linked_proc_info
**ptr
= &linked_proc_desc_table
;;
517 for (; &ptr
[0]->info
!= proc_desc
; ptr
= &ptr
[0]->next
)
518 if (ptr
[0] == NULL
) abort();
521 write_register (HI_REGNUM
, read_memory_integer(new_sp
- 8, 4));
522 write_register (LO_REGNUM
, read_memory_integer(new_sp
- 12, 4));
523 write_register (FCRCS_REGNUM
, read_memory_integer(new_sp
- 16, 4));
525 write_register (PC_REGNUM
, FRAME_SAVED_PC(frame
));
526 if (frame
->proc_desc
) {
527 for (regnum
= 32; --regnum
>= 0; )
528 if (PROC_REG_MASK(proc_desc
) & (1 << regnum
))
529 write_register (regnum
,
530 read_memory_integer (frame
->saved_regs
->regs
[regnum
], 4));
531 for (regnum
= 32; --regnum
>= 0; )
532 if (PROC_FREG_MASK(proc_desc
) & (1 << regnum
))
533 write_register (regnum
+ FP0_REGNUM
,
534 read_memory_integer (frame
->saved_regs
->regs
[regnum
+ FP0_REGNUM
], 4));
536 write_register (SP_REGNUM
, new_sp
);
537 flush_cached_frames ();
538 set_current_frame (create_new_frame (new_sp
, read_pc ()));
542 mips_print_register(regnum
, all
)
545 unsigned char raw_buffer
[MAX_REGISTER_RAW_SIZE
];
548 /* Get the data in raw format. */
549 if (read_relative_register_raw_bytes (regnum
, raw_buffer
))
551 printf_filtered ("%s: [Invalid]", reg_names
[regnum
]);
555 /* If an even floating pointer register, also print as double. */
556 if (regnum
>= FP0_REGNUM
&& regnum
< FP0_REGNUM
+32
557 && !((regnum
-FP0_REGNUM
) & 1)) {
558 read_relative_register_raw_bytes (regnum
+1, raw_buffer
+4);
559 printf_filtered ("(d%d: ", regnum
-FP0_REGNUM
);
560 val_print (builtin_type_double
, raw_buffer
, 0,
561 stdout
, 0, 1, 0, Val_pretty_default
);
562 printf_filtered ("); ");
564 fputs_filtered (reg_names
[regnum
], stdout
);
565 #ifndef NUMERIC_REG_NAMES
567 printf_filtered ("(r%d): ", regnum
);
570 printf_filtered (": ");
572 /* If virtual format is floating, print it that way. */
573 if (TYPE_CODE (REGISTER_VIRTUAL_TYPE (regnum
)) == TYPE_CODE_FLT
574 && ! INVALID_FLOAT (raw_buffer
, REGISTER_VIRTUAL_SIZE(regnum
))) {
575 val_print (REGISTER_VIRTUAL_TYPE (regnum
), raw_buffer
, 0,
576 stdout
, 0, 1, 0, Val_pretty_default
);
578 /* Else print as integer in hex. */
583 bcopy (raw_buffer
, &val
, sizeof (long));
584 SWAP_TARGET_AND_HOST ((char *)&val
, sizeof (long));
586 printf_filtered ("0");
588 printf_filtered (local_hex_format(), val
);
590 printf_filtered ("%s=%d", local_hex_string(val
), val
);
594 /* Replacement for generic do_registers_info. */
595 mips_do_registers_info (regnum
, fpregs
)
600 mips_print_register (regnum
, 0);
601 printf_filtered ("\n");
604 for (regnum
= 0; regnum
< NUM_REGS
; ) {
605 if ((!fpregs
) && regnum
>= FP0_REGNUM
&& regnum
<= FCRIR_REGNUM
) {
609 mips_print_register (regnum
, 1);
611 if ((regnum
& 3) == 0 || regnum
== NUM_REGS
)
612 printf_filtered (";\n");
614 printf_filtered ("; ");
618 /* Return number of args passed to a frame. described by FIP.
619 Can return -1, meaning no way to tell. */
621 mips_frame_num_args(fip
)
625 struct chain_info_t
*p
;
627 p
= mips_find_cached_frame(FRAME_FP(fip
));
629 return p
->the_info
.numargs
;
635 /* Bad floats: Returns 0 if P points to a valid IEEE floating point number,
636 1 if P points to a denormalized number or a NaN. LEN says whether this is
637 a single-precision or double-precision float */
638 #define SINGLE_EXP_BITS 8
639 #define DOUBLE_EXP_BITS 11
648 exponent
= exponent
<< 1 >> (32 - SINGLE_EXP_BITS
- 1);
649 return ((exponent
== -1) || (! exponent
&& *p
));
654 exponent
= exponent
<< 1 >> (32 - DOUBLE_EXP_BITS
- 1);
655 return ((exponent
== -1) || (! exponent
&& *p
* *(p
+1)));
661 * Implemented for Irix 4.x by Garrett A. Wollman
663 #ifdef USE_PROC_FS /* Target-dependent /proc support */
665 #include <sys/time.h>
666 #include <sys/procfs.h>
668 typedef unsigned int greg_t
; /* why isn't this defined? */
671 * See the comment in m68k-tdep.c regarding the utility of these functions.
675 supply_gregset (gregsetp
)
679 register greg_t
*regp
= (greg_t
*)(gregsetp
->gp_regs
);
681 /* FIXME: somewhere, there should be a #define for the meaning
682 of this magic number 32; we should use that. */
683 for(regno
= 0; regno
< 32; regno
++)
684 supply_register (regno
, (char *)(regp
+ regno
));
686 supply_register (PC_REGNUM
, (char *)&(gregsetp
->gp_pc
));
687 supply_register (HI_REGNUM
, (char *)&(gregsetp
->gp_mdhi
));
688 supply_register (LO_REGNUM
, (char *)&(gregsetp
->gp_mdlo
));
689 supply_register (PS_REGNUM
, (char *)&(gregsetp
->gp_cause
));
693 fill_gregset (gregsetp
, regno
)
698 register greg_t
*regp
= (greg_t
*)(gregsetp
->gp_regs
);
699 extern char registers
[];
701 /* same FIXME as above wrt 32*/
702 for (regi
= 0; regi
< 32; regi
++)
703 if ((regno
== -1) || (regno
== regi
))
704 *(regp
+ regno
) = *(greg_t
*) ®isters
[REGISTER_BYTE (regi
)];
706 if ((regno
== -1) || (regno
== PC_REGNUM
))
707 gregsetp
->gp_pc
= *(greg_t
*) ®isters
[REGISTER_BYTE (PC_REGNUM
)];
709 if ((regno
== -1) || (regno
== PS_REGNUM
))
710 gregsetp
->gp_cause
= *(greg_t
*) ®isters
[REGISTER_BYTE (PS_REGNUM
)];
712 if ((regno
== -1) || (regno
== HI_REGNUM
))
713 gregsetp
->gp_mdhi
= *(greg_t
*) ®isters
[REGISTER_BYTE (HI_REGNUM
)];
715 if ((regno
== -1) || (regno
== LO_REGNUM
))
716 gregsetp
->gp_mdlo
= *(greg_t
*) ®isters
[REGISTER_BYTE (LO_REGNUM
)];
720 * Now we do the same thing for floating-point registers.
721 * We don't bother to condition on FP0_REGNUM since any
722 * reasonable MIPS configuration has an R3010 in it.
724 * Again, see the comments in m68k-tdep.c.
728 supply_fpregset (fpregsetp
)
729 fpregset_t
*fpregsetp
;
733 for (regno
= 0; regno
< 32; regno
++)
734 supply_register (FP0_REGNUM
+ regno
,
735 (char *)&fpregsetp
->fp_r
.fp_regs
[regno
]);
737 supply_register (FCRCS_REGNUM
, (char *)&fpregsetp
->fp_csr
);
739 /* FIXME: how can we supply FCRIR_REGNUM? SGI doesn't tell us. */
743 fill_fpregset (fpregsetp
, regno
)
744 fpregset_t
*fpregsetp
;
749 extern char registers
[];
751 for (regi
= FP0_REGNUM
; regi
< FP0_REGNUM
+ 32; regi
++)
753 if ((regno
== -1) || (regno
== regi
))
755 from
= (char *) ®isters
[REGISTER_BYTE (regi
)];
756 to
= (char *) &(fpregsetp
->fp_r
.fp_regs
[regi
]);
757 bcopy(from
, to
, REGISTER_RAW_SIZE (regno
));
761 if ((regno
== -1) || (regno
== FCRCS_REGNUM
))
762 fpregsetp
->fp_csr
= *(unsigned *) ®isters
[REGISTER_BYTE(FCRCS_REGNUM
)];
765 #endif /* USE_PROC_FS */
767 /* To skip prologues, I use this predicate. Returns either PC
768 itself if the code at PC does not look like a function prologue,
769 PC+4 if it does (our caller does not need anything more fancy). */
772 mips_skip_prologue(pc
)
780 /* For -g modules and most functions anyways the
781 first instruction adjusts the stack.
782 But we allow some number of stores before the stack adjustment.
783 (These are emitted by varags functions compiled by gcc-2.0. */
784 for (offset
= 0; offset
< 100; offset
+= 4) {
785 inst
= read_memory_integer(pc
+ offset
, 4);
786 if ((inst
& 0xffff0000) == 0x27bd0000) /* addiu $sp,$sp,offset */
787 return pc
+ offset
+ 4;
788 if ((inst
& 0xFFE00000) != 0xAFA00000) /* sw reg,n($sp) */
792 /* Well, it looks like a frameless. Let's make sure.
793 Note that we are not called on the current PC,
794 but on the function`s start PC, and I have definitely
795 seen optimized code that adjusts the SP quite later */
796 b
= block_for_pc(pc
);
799 f
= lookup_symbol(".gdbinfo.", b
, LABEL_NAMESPACE
, 0, NULL
);
801 /* Ideally, I would like to use the adjusted info
802 from mips_frame_info(), but for all practical
803 purposes it will not matter (and it would require
804 a different definition of SKIP_PROLOGUE())
806 Actually, it would not hurt to skip the storing
807 of arguments on the stack as well. */
808 if (((struct mips_extra_func_info
*)f
->value
.value
)->framesize
)
814 /* Figure out where the longjmp will land.
815 We expect the first arg to be a pointer to the jmp_buf structure from which
816 we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
817 This routine returns true on success. */
820 get_longjmp_target(pc
)
825 jb_addr
= read_register(A0_REGNUM
);
827 if (target_read_memory(jb_addr
+ JB_PC
* JB_ELEMENT_SIZE
, pc
,
831 SWAP_TARGET_AND_HOST(pc
, sizeof(CORE_ADDR
));