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). */
49 #define MIPSMAGIC MIPSELMAGIC
51 #define MIPSMAGIC MIPSEBMAGIC
55 #define VM_MIN_ADDRESS (unsigned)0x400000
57 #include <sys/user.h> /* After a.out.h */
62 #define PROC_LOW_ADDR(proc) ((proc)->adr) /* least address */
63 #define PROC_HIGH_ADDR(proc) ((proc)->pad2) /* upper address bound */
64 #define PROC_FRAME_OFFSET(proc) ((proc)->framesize)
65 #define PROC_FRAME_REG(proc) ((proc)->framereg)
66 #define PROC_REG_MASK(proc) ((proc)->regmask)
67 #define PROC_FREG_MASK(proc) ((proc)->fregmask)
68 #define PROC_REG_OFFSET(proc) ((proc)->regoffset)
69 #define PROC_FREG_OFFSET(proc) ((proc)->fregoffset)
70 #define PROC_PC_REG(proc) ((proc)->pcreg)
71 #define PROC_SYMBOL(proc) (*(struct symbol**)&(proc)->isym)
72 #define _PROC_MAGIC_ 0x0F0F0F0F
73 #define PROC_DESC_IS_DUMMY(proc) ((proc)->isym == _PROC_MAGIC_)
74 #define SET_PROC_DESC_IS_DUMMY(proc) ((proc)->isym = _PROC_MAGIC_)
76 struct linked_proc_info
78 struct mips_extra_func_info info
;
79 struct linked_proc_info
*next
;
80 } * linked_proc_desc_table
= NULL
;
83 #define READ_FRAME_REG(fi, regno) read_next_frame_reg((fi)->next, regno)
86 read_next_frame_reg(fi
, regno
)
90 #define SIGFRAME_BASE sizeof(struct sigcontext)
91 #define SIGFRAME_PC_OFF (-SIGFRAME_BASE+ 2*sizeof(int))
92 #define SIGFRAME_SP_OFF (-SIGFRAME_BASE+32*sizeof(int))
93 #define SIGFRAME_RA_OFF (-SIGFRAME_BASE+34*sizeof(int))
94 for (; fi
; fi
= fi
->next
)
95 if (in_sigtramp(fi
->pc
, 0)) {
96 /* No idea if this code works. --PB. */
98 if (regno
== PC_REGNUM
) offset
= SIGFRAME_PC_OFF
;
99 else if (regno
== RA_REGNUM
) offset
= SIGFRAME_RA_OFF
;
100 else if (regno
== SP_REGNUM
) offset
= SIGFRAME_SP_OFF
;
102 return read_memory_integer(fi
->frame
+ offset
, 4);
104 else if (regno
== SP_REGNUM
) return fi
->frame
;
105 else if (fi
->saved_regs
->regs
[regno
])
106 return read_memory_integer(fi
->saved_regs
->regs
[regno
], 4);
107 return read_register(regno
);
111 mips_frame_saved_pc(frame
)
114 mips_extra_func_info_t proc_desc
= (mips_extra_func_info_t
)frame
->proc_desc
;
115 int pcreg
= proc_desc
? PROC_PC_REG(proc_desc
) : RA_REGNUM
;
116 if (proc_desc
&& PROC_DESC_IS_DUMMY(proc_desc
))
117 return read_memory_integer(frame
->frame
- 4, 4);
119 /* If in the procedure prologue, RA_REGNUM might not have been saved yet.
120 * Assume non-leaf functions start with:
121 * addiu $sp,$sp,-frame_size
122 * sw $ra,ra_offset($sp)
123 * This if the pc is pointing at either of these instructions,
124 * then $ra hasn't been trashed.
125 * If the pc has advanced beyond these two instructions,
126 * then $ra has been saved.
127 * critical, and much more complex. Handling $ra is enough to get
128 * a stack trace, but some register values with be wrong.
130 if (frame
->proc_desc
&& frame
->pc
< PROC_LOW_ADDR(proc_desc
) + 8)
131 return read_register(pcreg
);
133 return read_next_frame_reg(frame
, pcreg
);
136 static struct mips_extra_func_info temp_proc_desc
;
137 static struct frame_saved_regs temp_saved_regs
;
139 CORE_ADDR
heuristic_proc_start(pc
)
143 CORE_ADDR start_pc
= pc
;
144 CORE_ADDR fence
= start_pc
- 10000;
145 if (fence
< VM_MIN_ADDRESS
) fence
= VM_MIN_ADDRESS
;
146 /* search back for previous return */
147 for (start_pc
-= 4; ; start_pc
-= 4)
148 if (start_pc
< fence
) return 0;
149 else if (ABOUT_TO_RETURN(start_pc
))
152 start_pc
+= 8; /* skip return, and its delay slot */
154 /* skip nops (usually 1) 0 - is this */
155 while (start_pc
< pc
&& read_memory_integer (start_pc
, 4) == 0)
161 mips_extra_func_info_t
162 heuristic_proc_desc(start_pc
, limit_pc
, next_frame
)
163 CORE_ADDR start_pc
, limit_pc
;
166 CORE_ADDR sp
= next_frame
? next_frame
->frame
: read_register (SP_REGNUM
);
169 int has_frame_reg
= 0;
170 int reg30
; /* Value of $r30. Used by gcc for frame-pointer */
171 unsigned long reg_mask
= 0;
173 if (start_pc
== 0) return NULL
;
174 bzero(&temp_proc_desc
, sizeof(temp_proc_desc
));
175 bzero(&temp_saved_regs
, sizeof(struct frame_saved_regs
));
176 if (start_pc
+ 200 < limit_pc
) limit_pc
= start_pc
+ 200;
179 for (cur_pc
= start_pc
; cur_pc
< limit_pc
; cur_pc
+= 4) {
183 status
= read_memory_nobpt (cur_pc
, &word
, 4);
184 if (status
) memory_error (status
, cur_pc
);
185 if ((word
& 0xFFFF0000) == 0x27bd0000) /* addiu $sp,$sp,-i */
186 frame_size
+= (-word
) & 0xFFFF;
187 else if ((word
& 0xFFFF0000) == 0x23bd0000) /* addu $sp,$sp,-i */
188 frame_size
+= (-word
) & 0xFFFF;
189 else if ((word
& 0xFFE00000) == 0xafa00000) { /* sw reg,offset($sp) */
190 int reg
= (word
& 0x001F0000) >> 16;
191 reg_mask
|= 1 << reg
;
192 temp_saved_regs
.regs
[reg
] = sp
+ (short)word
;
194 else if ((word
& 0xFFFF0000) == 0x27be0000) { /* addiu $30,$sp,size */
195 if ((unsigned short)word
!= frame_size
)
196 reg30
= sp
+ (unsigned short)word
;
197 else if (!has_frame_reg
) {
200 reg30
= read_next_frame_reg(next_frame
, 30);
201 alloca_adjust
= reg30
- (sp
+ (unsigned short)word
);
202 if (alloca_adjust
> 0) {
203 /* FP > SP + frame_size. This may be because
204 /* of an alloca or somethings similar.
205 * Fix sp to "pre-alloca" value, and try again.
212 else if ((word
& 0xFFE00000) == 0xafc00000) { /* sw reg,offset($30) */
213 int reg
= (word
& 0x001F0000) >> 16;
214 reg_mask
|= 1 << reg
;
215 temp_saved_regs
.regs
[reg
] = reg30
+ (short)word
;
219 PROC_FRAME_REG(&temp_proc_desc
) = 30;
220 PROC_FRAME_OFFSET(&temp_proc_desc
) = 0;
223 PROC_FRAME_REG(&temp_proc_desc
) = SP_REGNUM
;
224 PROC_FRAME_OFFSET(&temp_proc_desc
) = frame_size
;
226 PROC_REG_MASK(&temp_proc_desc
) = reg_mask
;
227 PROC_PC_REG(&temp_proc_desc
) = RA_REGNUM
;
228 return &temp_proc_desc
;
231 mips_extra_func_info_t
232 find_proc_desc(pc
, next_frame
)
236 mips_extra_func_info_t proc_desc
;
237 extern struct block
*block_for_pc();
238 struct block
*b
= block_for_pc(pc
);
241 b
? lookup_symbol(".gdbinfo.", b
, LABEL_NAMESPACE
, 0, NULL
) : NULL
;
244 /* IF this is the topmost frame AND
245 * (this proc does not have debugging information OR
246 * the PC is in the procedure prologue)
247 * THEN create a "hueristic" proc_desc (by analyzing
248 * the actual code) to replace the "official" proc_desc.
250 proc_desc
= (struct mips_extra_func_info
*)sym
->value
.value
;
251 if (next_frame
== NULL
) {
252 struct symtab_and_line val
;
253 struct symbol
*proc_symbol
=
254 PROC_DESC_IS_DUMMY(proc_desc
) ? 0 : PROC_SYMBOL(proc_desc
);
256 val
= find_pc_line (BLOCK_START
257 (SYMBOL_BLOCK_VALUE(proc_symbol
)),
259 val
.pc
= val
.end
? val
.end
: pc
;
261 if (!proc_symbol
|| pc
< val
.pc
) {
262 mips_extra_func_info_t found_heuristic
=
263 heuristic_proc_desc(PROC_LOW_ADDR(proc_desc
),
265 if (found_heuristic
) proc_desc
= found_heuristic
;
271 register struct linked_proc_info
*link
;
272 for (link
= linked_proc_desc_table
; link
; link
= link
->next
)
273 if (PROC_LOW_ADDR(&link
->info
) <= pc
274 && PROC_HIGH_ADDR(&link
->info
) > pc
)
277 heuristic_proc_desc(heuristic_proc_start(pc
), pc
, next_frame
);
282 mips_extra_func_info_t cached_proc_desc
;
284 FRAME_ADDR
mips_frame_chain(frame
)
287 extern CORE_ADDR startup_file_start
; /* From blockframe.c */
288 mips_extra_func_info_t proc_desc
;
289 CORE_ADDR saved_pc
= FRAME_SAVED_PC(frame
);
290 if (startup_file_start
)
291 { /* has at least the __start symbol */
292 if (saved_pc
== 0 || !outside_startup_file (saved_pc
)) return 0;
295 { /* This hack depends on the internals of __start. */
296 /* We also assume the breakpoints are *not* inserted */
298 || read_memory_integer (saved_pc
+ 8, 4) & 0xFC00003F == 0xD)
299 return 0; /* break */
301 proc_desc
= find_proc_desc(saved_pc
, frame
);
302 if (!proc_desc
) return 0;
303 cached_proc_desc
= proc_desc
;
304 return read_next_frame_reg(frame
, PROC_FRAME_REG(proc_desc
))
305 + PROC_FRAME_OFFSET(proc_desc
);
309 init_extra_frame_info(fci
)
310 struct frame_info
*fci
;
312 extern struct obstack frame_cache_obstack
;
313 /* Use proc_desc calculated in frame_chain */
314 mips_extra_func_info_t proc_desc
= fci
->next
? cached_proc_desc
:
315 find_proc_desc(fci
->pc
, fci
->next
);
316 fci
->saved_regs
= (struct frame_saved_regs
*)
317 obstack_alloc (&frame_cache_obstack
, sizeof(struct frame_saved_regs
));
318 bzero(fci
->saved_regs
, sizeof(struct frame_saved_regs
));
320 proc_desc
== &temp_proc_desc
? (char*)NULL
: (char*)proc_desc
;
324 CORE_ADDR reg_position
;
326 /* r0 bit means kernel trap */
327 int kernel_trap
= PROC_REG_MASK(proc_desc
) & 1;
329 /* Fixup frame-pointer - only needed for top frame */
330 /* This may not be quite right, if procedure has a real frame register */
331 if (fci
->pc
== PROC_LOW_ADDR(proc_desc
))
332 fci
->frame
= read_register (SP_REGNUM
);
334 fci
->frame
= READ_FRAME_REG(fci
, PROC_FRAME_REG(proc_desc
))
335 + PROC_FRAME_OFFSET(proc_desc
);
337 if (proc_desc
== &temp_proc_desc
)
338 *fci
->saved_regs
= temp_saved_regs
;
341 /* find which general-purpose registers were saved */
342 reg_position
= fci
->frame
+ PROC_REG_OFFSET(proc_desc
);
343 mask
= kernel_trap
? 0xFFFFFFFF : PROC_REG_MASK(proc_desc
);
344 for (ireg
= 31; mask
; --ireg
, mask
<<= 1)
345 if (mask
& 0x80000000)
347 fci
->saved_regs
->regs
[ireg
] = reg_position
;
350 /* find which floating-point registers were saved */
351 reg_position
= fci
->frame
+ PROC_FREG_OFFSET(proc_desc
);
352 /* The freg_offset points to where the first *double* register is saved.
353 * So skip to the high-order word. */
355 mask
= kernel_trap
? 0xFFFFFFFF : PROC_FREG_MASK(proc_desc
);
356 for (ireg
= 31; mask
; --ireg
, mask
<<= 1)
357 if (mask
& 0x80000000)
359 fci
->saved_regs
->regs
[FP0_REGNUM
+ireg
] = reg_position
;
364 /* hack: if argument regs are saved, guess these contain args */
365 if ((PROC_REG_MASK(proc_desc
) & 0xF0) == 0) fci
->num_args
= -1;
366 else if ((PROC_REG_MASK(proc_desc
) & 0x80) == 0) fci
->num_args
= 4;
367 else if ((PROC_REG_MASK(proc_desc
) & 0x40) == 0) fci
->num_args
= 3;
368 else if ((PROC_REG_MASK(proc_desc
) & 0x20) == 0) fci
->num_args
= 2;
369 else if ((PROC_REG_MASK(proc_desc
) & 0x10) == 0) fci
->num_args
= 1;
371 fci
->saved_regs
->regs
[PC_REGNUM
] = fci
->saved_regs
->regs
[RA_REGNUM
];
374 supply_register(FP_REGNUM
, &fci
->frame
);
378 CORE_ADDR
mips_push_arguments(nargs
, args
, sp
, struct_return
, struct_addr
)
383 CORE_ADDR struct_addr
;
387 int accumulate_size
= struct_return
? 4 : 0;
388 struct mips_arg
{ char *contents
; int len
; int offset
; };
389 struct mips_arg
*mips_args
=
390 (struct mips_arg
*)alloca(nargs
* sizeof(struct mips_arg
));
391 register struct mips_arg
*m_arg
;
392 for (i
= 0, m_arg
= mips_args
; i
< nargs
; i
++, m_arg
++) {
393 extern value
value_arg_coerce();
394 value arg
= value_arg_coerce (args
[i
]);
395 m_arg
->len
= TYPE_LENGTH (VALUE_TYPE (arg
));
396 /* This entire mips-specific routine is because doubles must be aligned
397 * on 8-byte boundaries. It still isn't quite right, because MIPS decided
398 * to align 'struct {int a, b}' on 4-byte boundaries (even though this
399 * breaks their varargs implementation...). A correct solution
400 * requires an simulation of gcc's 'alignof' (and use of 'alignof'
401 * in stdarg.h/varargs.h).
403 if (m_arg
->len
> 4) accumulate_size
= (accumulate_size
+ 7) & -8;
404 m_arg
->offset
= accumulate_size
;
405 accumulate_size
= (accumulate_size
+ m_arg
->len
+ 3) & -4;
406 m_arg
->contents
= VALUE_CONTENTS(arg
);
408 accumulate_size
= (accumulate_size
+ 7) & (-8);
409 if (accumulate_size
< 16) accumulate_size
= 16;
410 sp
-= accumulate_size
;
411 for (i
= nargs
; m_arg
--, --i
>= 0; )
412 write_memory(sp
+ m_arg
->offset
, m_arg
->contents
, m_arg
->len
);
415 write_memory(sp
, &buf
, sizeof(CORE_ADDR
));
420 /* MASK(i,j) == (1<<i) + (1<<(i+1)) + ... + (1<<j)). Assume i<=j<31. */
421 #define MASK(i,j) ((1 << (j)+1)-1 ^ (1 << (i))-1)
424 mips_push_dummy_frame()
427 struct linked_proc_info
*link
= (struct linked_proc_info
*)
428 xmalloc(sizeof(struct linked_proc_info
));
429 mips_extra_func_info_t proc_desc
= &link
->info
;
430 CORE_ADDR sp
= read_register (SP_REGNUM
);
431 CORE_ADDR save_address
;
432 REGISTER_TYPE buffer
;
433 link
->next
= linked_proc_desc_table
;
434 linked_proc_desc_table
= link
;
435 #define PUSH_FP_REGNUM 16 /* must be a register preserved across calls */
436 #define GEN_REG_SAVE_MASK MASK(1,16)|MASK(24,28)|(1<<31)
437 #define GEN_REG_SAVE_COUNT 22
438 #define FLOAT_REG_SAVE_MASK MASK(0,19)
439 #define FLOAT_REG_SAVE_COUNT 20
440 #define SPECIAL_REG_SAVE_COUNT 4
442 * The registers we must save are all those not preserved across
443 * procedure calls. Dest_Reg (see tm-mips.h) must also be saved.
444 * In addition, we must save the PC, and PUSH_FP_REGNUM.
445 * (Ideally, we should also save MDLO/-HI and FP Control/Status reg.)
447 * Dummy frame layout:
450 * Saved MMHI, MMLO, FPC_CSR
455 * Saved D18 (i.e. F19, F18)
457 * Saved D0 (i.e. F1, F0)
458 * CALL_DUMMY (subroutine stub; see m-mips.h)
459 * Parameter build area (not yet implemented)
462 PROC_REG_MASK(proc_desc
) = GEN_REG_SAVE_MASK
;
463 PROC_FREG_MASK(proc_desc
) = FLOAT_REG_SAVE_MASK
;
464 PROC_REG_OFFSET(proc_desc
) = /* offset of (Saved R31) from FP */
465 -sizeof(long) - 4 * SPECIAL_REG_SAVE_COUNT
;
466 PROC_FREG_OFFSET(proc_desc
) = /* offset of (Saved D18) from FP */
467 -sizeof(double) - 4 * (SPECIAL_REG_SAVE_COUNT
+ GEN_REG_SAVE_COUNT
);
468 /* save general registers */
469 save_address
= sp
+ PROC_REG_OFFSET(proc_desc
);
470 for (ireg
= 32; --ireg
>= 0; )
471 if (PROC_REG_MASK(proc_desc
) & (1 << ireg
))
473 buffer
= read_register (ireg
);
474 write_memory (save_address
, &buffer
, sizeof(REGISTER_TYPE
));
477 /* save floating-points registers */
478 save_address
= sp
+ PROC_FREG_OFFSET(proc_desc
);
479 for (ireg
= 32; --ireg
>= 0; )
480 if (PROC_FREG_MASK(proc_desc
) & (1 << ireg
))
482 buffer
= read_register (ireg
+ FP0_REGNUM
);
483 write_memory (save_address
, &buffer
, 4);
486 write_register (PUSH_FP_REGNUM
, sp
);
487 PROC_FRAME_REG(proc_desc
) = PUSH_FP_REGNUM
;
488 PROC_FRAME_OFFSET(proc_desc
) = 0;
489 buffer
= read_register (PC_REGNUM
);
490 write_memory (sp
- 4, &buffer
, sizeof(REGISTER_TYPE
));
491 buffer
= read_register (HI_REGNUM
);
492 write_memory (sp
- 8, &buffer
, sizeof(REGISTER_TYPE
));
493 buffer
= read_register (LO_REGNUM
);
494 write_memory (sp
- 12, &buffer
, sizeof(REGISTER_TYPE
));
495 buffer
= read_register (FCRCS_REGNUM
);
496 write_memory (sp
- 16, &buffer
, sizeof(REGISTER_TYPE
));
497 sp
-= 4 * (GEN_REG_SAVE_COUNT
+FLOAT_REG_SAVE_COUNT
+SPECIAL_REG_SAVE_COUNT
);
498 write_register (SP_REGNUM
, sp
);
499 PROC_LOW_ADDR(proc_desc
) = sp
- CALL_DUMMY_SIZE
+ CALL_DUMMY_START_OFFSET
;
500 PROC_HIGH_ADDR(proc_desc
) = sp
;
501 SET_PROC_DESC_IS_DUMMY(proc_desc
);
502 PROC_PC_REG(proc_desc
) = RA_REGNUM
;
507 { register int regnum
;
508 FRAME frame
= get_current_frame ();
509 CORE_ADDR new_sp
= frame
->frame
;
510 mips_extra_func_info_t proc_desc
= (mips_extra_func_info_t
)frame
->proc_desc
;
511 if (PROC_DESC_IS_DUMMY(proc_desc
))
513 struct linked_proc_info
**ptr
= &linked_proc_desc_table
;;
514 for (; &ptr
[0]->info
!= proc_desc
; ptr
= &ptr
[0]->next
)
515 if (ptr
[0] == NULL
) abort();
518 write_register (HI_REGNUM
, read_memory_integer(new_sp
- 8, 4));
519 write_register (LO_REGNUM
, read_memory_integer(new_sp
- 12, 4));
520 write_register (FCRCS_REGNUM
, read_memory_integer(new_sp
- 16, 4));
522 write_register (PC_REGNUM
, FRAME_SAVED_PC(frame
));
523 if (frame
->proc_desc
) {
524 for (regnum
= 32; --regnum
>= 0; )
525 if (PROC_REG_MASK(proc_desc
) & (1 << regnum
))
526 write_register (regnum
,
527 read_memory_integer (frame
->saved_regs
->regs
[regnum
], 4));
528 for (regnum
= 32; --regnum
>= 0; )
529 if (PROC_FREG_MASK(proc_desc
) & (1 << regnum
))
530 write_register (regnum
+ FP0_REGNUM
,
531 read_memory_integer (frame
->saved_regs
->regs
[regnum
+ FP0_REGNUM
], 4));
533 write_register (SP_REGNUM
, new_sp
);
534 flush_cached_frames ();
535 set_current_frame (create_new_frame (new_sp
, read_pc ()));
539 mips_print_register(regnum
, all
)
542 unsigned char raw_buffer
[8];
545 read_relative_register_raw_bytes (regnum
, raw_buffer
);
547 /* If an even floating pointer register, also print as double. */
548 if (regnum
>= FP0_REGNUM
&& regnum
< FP0_REGNUM
+32
549 && !((regnum
-FP0_REGNUM
) & 1)) {
550 read_relative_register_raw_bytes (regnum
+1, raw_buffer
+4);
551 printf_filtered ("(d%d: ", regnum
-FP0_REGNUM
);
552 val_print (builtin_type_double
, raw_buffer
, 0,
553 stdout
, 0, 1, 0, Val_pretty_default
);
554 printf_filtered ("); ");
556 fputs_filtered (reg_names
[regnum
], stdout
);
557 #ifndef NUMERIC_REG_NAMES
559 printf_filtered ("(r%d): ", regnum
);
562 printf_filtered (": ");
564 /* If virtual format is floating, print it that way. */
565 if (TYPE_CODE (REGISTER_VIRTUAL_TYPE (regnum
)) == TYPE_CODE_FLT
566 && ! INVALID_FLOAT (raw_buffer
, REGISTER_VIRTUAL_SIZE(regnum
))) {
567 val_print (REGISTER_VIRTUAL_TYPE (regnum
), raw_buffer
, 0,
568 stdout
, 0, 1, 0, Val_pretty_default
);
570 /* Else print as integer in hex. */
575 bcopy (raw_buffer
, &val
, sizeof (long));
577 printf_filtered ("0");
579 printf_filtered (local_hex_format(), val
);
581 printf_filtered ("%s=%d", local_hex_string(val
), val
);
585 /* Replacement for generic do_registers_info. */
586 mips_do_registers_info (regnum
, fpregs
)
591 mips_print_register (regnum
, 0);
592 printf_filtered ("\n");
595 for (regnum
= 0; regnum
< NUM_REGS
; ) {
596 if ((!fpregs
) && regnum
>= FP0_REGNUM
&& regnum
<= FCRIR_REGNUM
) {
600 mips_print_register (regnum
, 1);
602 if ((regnum
& 3) == 0 || regnum
== NUM_REGS
)
603 printf_filtered (";\n");
605 printf_filtered ("; ");
609 /* Return number of args passed to a frame. described by FIP.
610 Can return -1, meaning no way to tell. */
612 mips_frame_num_args(fip
)
616 struct chain_info_t
*p
;
618 p
= mips_find_cached_frame(FRAME_FP(fip
));
620 return p
->the_info
.numargs
;
626 /* Bad floats: Returns 0 if P points to a valid IEEE floating point number,
627 1 if P points to a denormalized number or a NaN. LEN says whether this is
628 a single-precision or double-precision float */
629 #define SINGLE_EXP_BITS 8
630 #define DOUBLE_EXP_BITS 11
639 exponent
= exponent
<< 1 >> (32 - SINGLE_EXP_BITS
- 1);
640 return ((exponent
== -1) || (! exponent
&& *p
));
645 exponent
= exponent
<< 1 >> (32 - DOUBLE_EXP_BITS
- 1);
646 return ((exponent
== -1) || (! exponent
&& *p
* *(p
+1)));
652 * Implemented for Irix 4.x by Garrett A. Wollman
654 #ifdef USE_PROC_FS /* Target-dependent /proc support */
656 #include <sys/time.h>
657 #include <sys/procfs.h>
659 typedef unsigned int greg_t
; /* why isn't this defined? */
662 * See the comment in m68k-tdep.c regarding the utility of these functions.
666 supply_gregset (gregsetp
)
670 register greg_t
*regp
= (greg_t
*)(gregsetp
->gp_regs
);
672 /* FIXME: somewhere, there should be a #define for the meaning
673 of this magic number 32; we should use that. */
674 for(regno
= 0; regno
< 32; regno
++)
675 supply_register (regno
, (char *)(regp
+ regno
));
677 supply_register (PC_REGNUM
, (char *)&(gregsetp
->gp_pc
));
678 supply_register (HI_REGNUM
, (char *)&(gregsetp
->gp_mdhi
));
679 supply_register (LO_REGNUM
, (char *)&(gregsetp
->gp_mdlo
));
680 supply_register (PS_REGNUM
, (char *)&(gregsetp
->gp_cause
));
684 fill_gregset (gregsetp
, regno
)
689 register greg_t
*regp
= (greg_t
*)(gregsetp
->gp_regs
);
690 extern char registers
[];
692 /* same FIXME as above wrt 32*/
693 for (regi
= 0; regi
< 32; regi
++)
694 if ((regno
== -1) || (regno
== regi
))
695 *(regp
+ regno
) = *(greg_t
*) ®isters
[REGISTER_BYTE (regi
)];
697 if ((regno
== -1) || (regno
== PC_REGNUM
))
698 gregsetp
->gp_pc
= *(greg_t
*) ®isters
[REGISTER_BYTE (PC_REGNUM
)];
700 if ((regno
== -1) || (regno
== PS_REGNUM
))
701 gregsetp
->gp_cause
= *(greg_t
*) ®isters
[REGISTER_BYTE (PS_REGNUM
)];
703 if ((regno
== -1) || (regno
== HI_REGNUM
))
704 gregsetp
->gp_mdhi
= *(greg_t
*) ®isters
[REGISTER_BYTE (HI_REGNUM
)];
706 if ((regno
== -1) || (regno
== LO_REGNUM
))
707 gregsetp
->gp_mdlo
= *(greg_t
*) ®isters
[REGISTER_BYTE (LO_REGNUM
)];
711 * Now we do the same thing for floating-point registers.
712 * We don't bother to condition on FP0_REGNUM since any
713 * reasonable MIPS configuration has an R3010 in it.
715 * Again, see the comments in m68k-tdep.c.
719 supply_fpregset (fpregsetp
)
720 fpregset_t
*fpregsetp
;
724 for (regno
= 0; regno
< 32; regno
++)
725 supply_register (FP0_REGNUM
+ regno
,
726 (char *)&fpregsetp
->fp_r
.fp_regs
[regno
]);
728 supply_register (FCRCS_REGNUM
, (char *)&fpregsetp
->fp_csr
);
730 /* FIXME: how can we supply FCRIR_REGNUM? SGI doesn't tell us. */
734 fill_fpregset (fpregsetp
, regno
)
735 fpregset_t
*fpregsetp
;
740 extern char registers
[];
742 for (regi
= FP0_REGNUM
; regi
< FP0_REGNUM
+ 32; regi
++)
744 if ((regno
== -1) || (regno
== regi
))
746 from
= (char *) ®isters
[REGISTER_BYTE (regi
)];
747 to
= (char *) &(fpregsetp
->fp_r
.fp_regs
[regi
]);
748 bcopy(from
, to
, REGISTER_RAW_SIZE (regno
));
752 if ((regno
== -1) || (regno
== FCRCS_REGNUM
))
753 fpregsetp
->fp_csr
= *(unsigned *) ®isters
[REGISTER_BYTE(FCRCS_REGNUM
)];
756 #endif /* USE_PROC_FS */
758 /* To skip prologues, I use this predicate. Returns either PC
759 itself if the code at PC does not look like a function prologue,
760 PC+4 if it does (our caller does not need anything more fancy). */
762 CORE_ADDR
mips_skip_prologue(pc
)
770 /* For -g modules and most functions anyways the
771 first instruction adjusts the stack.
772 But we allow some number of stores before the stack adjustment.
773 (These are emitted by varags functions compiled by gcc-2.0. */
774 for (offset
= 0; offset
< 100; offset
+= 4) {
775 inst
= read_memory_integer(pc
+ offset
, 4);
776 if ((inst
& 0xffff0000) == 0x27bd0000) /* addiu $sp,$sp,offset */
777 return pc
+ offset
+ 4;
778 if ((inst
& 0xFFE00000) != 0xAFA00000) /* sw reg,n($sp) */
782 /* Well, it looks like a frameless. Let's make sure.
783 Note that we are not called on the current PC,
784 but on the function`s start PC, and I have definitely
785 seen optimized code that adjusts the SP quite later */
786 b
= block_for_pc(pc
);
789 f
= lookup_symbol(".gdbinfo.", b
, LABEL_NAMESPACE
, 0, NULL
);
791 /* Ideally, I would like to use the adjusted info
792 from mips_frame_info(), but for all practical
793 purposes it will not matter (and it would require
794 a different definition of SKIP_PROLOGUE())
796 Actually, it would not hurt to skip the storing
797 of arguments on the stack as well. */
798 if (((struct mips_extra_func_info
*)f
->value
.value
)->framesize
)
804 /* Figure out where the longjmp will land.
805 We expect the first arg to be a pointer to the jmp_buf structure from which
806 we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
807 This routine returns true on success. */
810 get_longjmp_target(pc
)
815 jb_addr
= read_register(A0_REGNUM
);
817 if (target_read_memory(jb_addr
+ JB_PC
* JB_ELEMENT_SIZE
, pc
,
821 SWAP_TARGET_AND_HOST(pc
, sizeof(CORE_ADDR
));