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 "hueristic" 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
);
292 if (current_objfile
->ei
.entry_file_lowpc
)
293 { /* has at least the __start symbol */
294 if (saved_pc
== 0 || inside_entry_file (saved_pc
)) return 0;
297 { /* This hack depends on the internals of __start. */
298 /* We also assume the breakpoints are *not* inserted */
300 || read_memory_integer (saved_pc
+ 8, 4) & 0xFC00003F == 0xD)
301 return 0; /* break */
303 proc_desc
= find_proc_desc(saved_pc
, frame
);
304 if (!proc_desc
) return 0;
305 cached_proc_desc
= proc_desc
;
306 return read_next_frame_reg(frame
, PROC_FRAME_REG(proc_desc
))
307 + PROC_FRAME_OFFSET(proc_desc
);
311 init_extra_frame_info(fci
)
312 struct frame_info
*fci
;
314 extern struct obstack frame_cache_obstack
;
315 /* Use proc_desc calculated in frame_chain */
316 mips_extra_func_info_t proc_desc
= fci
->next
? cached_proc_desc
:
317 find_proc_desc(fci
->pc
, fci
->next
);
318 fci
->saved_regs
= (struct frame_saved_regs
*)
319 obstack_alloc (&frame_cache_obstack
, sizeof(struct frame_saved_regs
));
320 bzero(fci
->saved_regs
, sizeof(struct frame_saved_regs
));
322 proc_desc
== &temp_proc_desc
? (char*)NULL
: (char*)proc_desc
;
326 CORE_ADDR reg_position
;
328 /* r0 bit means kernel trap */
329 int kernel_trap
= PROC_REG_MASK(proc_desc
) & 1;
331 /* Fixup frame-pointer - only needed for top frame */
332 /* This may not be quite right, if procedure has a real frame register */
333 if (fci
->pc
== PROC_LOW_ADDR(proc_desc
))
334 fci
->frame
= read_register (SP_REGNUM
);
336 fci
->frame
= READ_FRAME_REG(fci
, PROC_FRAME_REG(proc_desc
))
337 + PROC_FRAME_OFFSET(proc_desc
);
339 if (proc_desc
== &temp_proc_desc
)
340 *fci
->saved_regs
= temp_saved_regs
;
343 /* find which general-purpose registers were saved */
344 reg_position
= fci
->frame
+ PROC_REG_OFFSET(proc_desc
);
345 mask
= kernel_trap
? 0xFFFFFFFF : PROC_REG_MASK(proc_desc
);
346 for (ireg
= 31; mask
; --ireg
, mask
<<= 1)
347 if (mask
& 0x80000000)
349 fci
->saved_regs
->regs
[ireg
] = reg_position
;
352 /* find which floating-point registers were saved */
353 reg_position
= fci
->frame
+ PROC_FREG_OFFSET(proc_desc
);
354 /* The freg_offset points to where the first *double* register is saved.
355 * So skip to the high-order word. */
357 mask
= kernel_trap
? 0xFFFFFFFF : PROC_FREG_MASK(proc_desc
);
358 for (ireg
= 31; mask
; --ireg
, mask
<<= 1)
359 if (mask
& 0x80000000)
361 fci
->saved_regs
->regs
[FP0_REGNUM
+ireg
] = reg_position
;
366 /* hack: if argument regs are saved, guess these contain args */
367 if ((PROC_REG_MASK(proc_desc
) & 0xF0) == 0) fci
->num_args
= -1;
368 else if ((PROC_REG_MASK(proc_desc
) & 0x80) == 0) fci
->num_args
= 4;
369 else if ((PROC_REG_MASK(proc_desc
) & 0x40) == 0) fci
->num_args
= 3;
370 else if ((PROC_REG_MASK(proc_desc
) & 0x20) == 0) fci
->num_args
= 2;
371 else if ((PROC_REG_MASK(proc_desc
) & 0x10) == 0) fci
->num_args
= 1;
373 fci
->saved_regs
->regs
[PC_REGNUM
] = fci
->saved_regs
->regs
[RA_REGNUM
];
376 supply_register(FP_REGNUM
, &fci
->frame
);
380 CORE_ADDR
mips_push_arguments(nargs
, args
, sp
, struct_return
, struct_addr
)
385 CORE_ADDR struct_addr
;
389 int accumulate_size
= struct_return
? 4 : 0;
390 struct mips_arg
{ char *contents
; int len
; int offset
; };
391 struct mips_arg
*mips_args
=
392 (struct mips_arg
*)alloca(nargs
* sizeof(struct mips_arg
));
393 register struct mips_arg
*m_arg
;
394 for (i
= 0, m_arg
= mips_args
; i
< nargs
; i
++, m_arg
++) {
395 extern value
value_arg_coerce();
396 value arg
= value_arg_coerce (args
[i
]);
397 m_arg
->len
= TYPE_LENGTH (VALUE_TYPE (arg
));
398 /* This entire mips-specific routine is because doubles must be aligned
399 * on 8-byte boundaries. It still isn't quite right, because MIPS decided
400 * to align 'struct {int a, b}' on 4-byte boundaries (even though this
401 * breaks their varargs implementation...). A correct solution
402 * requires an simulation of gcc's 'alignof' (and use of 'alignof'
403 * in stdarg.h/varargs.h).
405 if (m_arg
->len
> 4) accumulate_size
= (accumulate_size
+ 7) & -8;
406 m_arg
->offset
= accumulate_size
;
407 accumulate_size
= (accumulate_size
+ m_arg
->len
+ 3) & -4;
408 m_arg
->contents
= VALUE_CONTENTS(arg
);
410 accumulate_size
= (accumulate_size
+ 7) & (-8);
411 if (accumulate_size
< 16) accumulate_size
= 16;
412 sp
-= accumulate_size
;
413 for (i
= nargs
; m_arg
--, --i
>= 0; )
414 write_memory(sp
+ m_arg
->offset
, m_arg
->contents
, m_arg
->len
);
417 write_memory(sp
, &buf
, sizeof(CORE_ADDR
));
422 /* MASK(i,j) == (1<<i) + (1<<(i+1)) + ... + (1<<j)). Assume i<=j<31. */
423 #define MASK(i,j) ((1 << (j)+1)-1 ^ (1 << (i))-1)
426 mips_push_dummy_frame()
429 struct linked_proc_info
*link
= (struct linked_proc_info
*)
430 xmalloc(sizeof(struct linked_proc_info
));
431 mips_extra_func_info_t proc_desc
= &link
->info
;
432 CORE_ADDR sp
= read_register (SP_REGNUM
);
433 CORE_ADDR save_address
;
434 REGISTER_TYPE buffer
;
435 link
->next
= linked_proc_desc_table
;
436 linked_proc_desc_table
= link
;
437 #define PUSH_FP_REGNUM 16 /* must be a register preserved across calls */
438 #define GEN_REG_SAVE_MASK MASK(1,16)|MASK(24,28)|(1<<31)
439 #define GEN_REG_SAVE_COUNT 22
440 #define FLOAT_REG_SAVE_MASK MASK(0,19)
441 #define FLOAT_REG_SAVE_COUNT 20
442 #define SPECIAL_REG_SAVE_COUNT 4
444 * The registers we must save are all those not preserved across
445 * procedure calls. Dest_Reg (see tm-mips.h) must also be saved.
446 * In addition, we must save the PC, and PUSH_FP_REGNUM.
447 * (Ideally, we should also save MDLO/-HI and FP Control/Status reg.)
449 * Dummy frame layout:
452 * Saved MMHI, MMLO, FPC_CSR
457 * Saved D18 (i.e. F19, F18)
459 * Saved D0 (i.e. F1, F0)
460 * CALL_DUMMY (subroutine stub; see m-mips.h)
461 * Parameter build area (not yet implemented)
464 PROC_REG_MASK(proc_desc
) = GEN_REG_SAVE_MASK
;
465 PROC_FREG_MASK(proc_desc
) = FLOAT_REG_SAVE_MASK
;
466 PROC_REG_OFFSET(proc_desc
) = /* offset of (Saved R31) from FP */
467 -sizeof(long) - 4 * SPECIAL_REG_SAVE_COUNT
;
468 PROC_FREG_OFFSET(proc_desc
) = /* offset of (Saved D18) from FP */
469 -sizeof(double) - 4 * (SPECIAL_REG_SAVE_COUNT
+ GEN_REG_SAVE_COUNT
);
470 /* save general registers */
471 save_address
= sp
+ PROC_REG_OFFSET(proc_desc
);
472 for (ireg
= 32; --ireg
>= 0; )
473 if (PROC_REG_MASK(proc_desc
) & (1 << ireg
))
475 buffer
= read_register (ireg
);
476 write_memory (save_address
, &buffer
, sizeof(REGISTER_TYPE
));
479 /* save floating-points registers */
480 save_address
= sp
+ PROC_FREG_OFFSET(proc_desc
);
481 for (ireg
= 32; --ireg
>= 0; )
482 if (PROC_FREG_MASK(proc_desc
) & (1 << ireg
))
484 buffer
= read_register (ireg
+ FP0_REGNUM
);
485 write_memory (save_address
, &buffer
, 4);
488 write_register (PUSH_FP_REGNUM
, sp
);
489 PROC_FRAME_REG(proc_desc
) = PUSH_FP_REGNUM
;
490 PROC_FRAME_OFFSET(proc_desc
) = 0;
491 buffer
= read_register (PC_REGNUM
);
492 write_memory (sp
- 4, &buffer
, sizeof(REGISTER_TYPE
));
493 buffer
= read_register (HI_REGNUM
);
494 write_memory (sp
- 8, &buffer
, sizeof(REGISTER_TYPE
));
495 buffer
= read_register (LO_REGNUM
);
496 write_memory (sp
- 12, &buffer
, sizeof(REGISTER_TYPE
));
497 buffer
= read_register (FCRCS_REGNUM
);
498 write_memory (sp
- 16, &buffer
, sizeof(REGISTER_TYPE
));
499 sp
-= 4 * (GEN_REG_SAVE_COUNT
+FLOAT_REG_SAVE_COUNT
+SPECIAL_REG_SAVE_COUNT
);
500 write_register (SP_REGNUM
, sp
);
501 PROC_LOW_ADDR(proc_desc
) = sp
- CALL_DUMMY_SIZE
+ CALL_DUMMY_START_OFFSET
;
502 PROC_HIGH_ADDR(proc_desc
) = sp
;
503 SET_PROC_DESC_IS_DUMMY(proc_desc
);
504 PROC_PC_REG(proc_desc
) = RA_REGNUM
;
509 { register int regnum
;
510 FRAME frame
= get_current_frame ();
511 CORE_ADDR new_sp
= frame
->frame
;
512 mips_extra_func_info_t proc_desc
= (mips_extra_func_info_t
)frame
->proc_desc
;
513 if (PROC_DESC_IS_DUMMY(proc_desc
))
515 struct linked_proc_info
**ptr
= &linked_proc_desc_table
;;
516 for (; &ptr
[0]->info
!= proc_desc
; ptr
= &ptr
[0]->next
)
517 if (ptr
[0] == NULL
) abort();
520 write_register (HI_REGNUM
, read_memory_integer(new_sp
- 8, 4));
521 write_register (LO_REGNUM
, read_memory_integer(new_sp
- 12, 4));
522 write_register (FCRCS_REGNUM
, read_memory_integer(new_sp
- 16, 4));
524 write_register (PC_REGNUM
, FRAME_SAVED_PC(frame
));
525 if (frame
->proc_desc
) {
526 for (regnum
= 32; --regnum
>= 0; )
527 if (PROC_REG_MASK(proc_desc
) & (1 << regnum
))
528 write_register (regnum
,
529 read_memory_integer (frame
->saved_regs
->regs
[regnum
], 4));
530 for (regnum
= 32; --regnum
>= 0; )
531 if (PROC_FREG_MASK(proc_desc
) & (1 << regnum
))
532 write_register (regnum
+ FP0_REGNUM
,
533 read_memory_integer (frame
->saved_regs
->regs
[regnum
+ FP0_REGNUM
], 4));
535 write_register (SP_REGNUM
, new_sp
);
536 flush_cached_frames ();
537 set_current_frame (create_new_frame (new_sp
, read_pc ()));
541 mips_print_register(regnum
, all
)
544 unsigned char raw_buffer
[MAX_REGISTER_RAW_SIZE
];
547 /* Get the data in raw format. */
548 if (read_relative_register_raw_bytes (regnum
, raw_buffer
))
550 printf_filtered ("%s: [Invalid]", reg_names
[regnum
]);
554 /* If an even floating pointer register, also print as double. */
555 if (regnum
>= FP0_REGNUM
&& regnum
< FP0_REGNUM
+32
556 && !((regnum
-FP0_REGNUM
) & 1)) {
557 read_relative_register_raw_bytes (regnum
+1, raw_buffer
+4);
558 printf_filtered ("(d%d: ", regnum
-FP0_REGNUM
);
559 val_print (builtin_type_double
, raw_buffer
, 0,
560 stdout
, 0, 1, 0, Val_pretty_default
);
561 printf_filtered ("); ");
563 fputs_filtered (reg_names
[regnum
], stdout
);
564 #ifndef NUMERIC_REG_NAMES
566 printf_filtered ("(r%d): ", regnum
);
569 printf_filtered (": ");
571 /* If virtual format is floating, print it that way. */
572 if (TYPE_CODE (REGISTER_VIRTUAL_TYPE (regnum
)) == TYPE_CODE_FLT
573 && ! INVALID_FLOAT (raw_buffer
, REGISTER_VIRTUAL_SIZE(regnum
))) {
574 val_print (REGISTER_VIRTUAL_TYPE (regnum
), raw_buffer
, 0,
575 stdout
, 0, 1, 0, Val_pretty_default
);
577 /* Else print as integer in hex. */
582 bcopy (raw_buffer
, &val
, sizeof (long));
583 SWAP_TARGET_AND_HOST ((char *)&val
, sizeof (long));
585 printf_filtered ("0");
587 printf_filtered (local_hex_format(), val
);
589 printf_filtered ("%s=%d", local_hex_string(val
), val
);
593 /* Replacement for generic do_registers_info. */
594 mips_do_registers_info (regnum
, fpregs
)
599 mips_print_register (regnum
, 0);
600 printf_filtered ("\n");
603 for (regnum
= 0; regnum
< NUM_REGS
; ) {
604 if ((!fpregs
) && regnum
>= FP0_REGNUM
&& regnum
<= FCRIR_REGNUM
) {
608 mips_print_register (regnum
, 1);
610 if ((regnum
& 3) == 0 || regnum
== NUM_REGS
)
611 printf_filtered (";\n");
613 printf_filtered ("; ");
617 /* Return number of args passed to a frame. described by FIP.
618 Can return -1, meaning no way to tell. */
620 mips_frame_num_args(fip
)
624 struct chain_info_t
*p
;
626 p
= mips_find_cached_frame(FRAME_FP(fip
));
628 return p
->the_info
.numargs
;
634 /* Bad floats: Returns 0 if P points to a valid IEEE floating point number,
635 1 if P points to a denormalized number or a NaN. LEN says whether this is
636 a single-precision or double-precision float */
637 #define SINGLE_EXP_BITS 8
638 #define DOUBLE_EXP_BITS 11
647 exponent
= exponent
<< 1 >> (32 - SINGLE_EXP_BITS
- 1);
648 return ((exponent
== -1) || (! exponent
&& *p
));
653 exponent
= exponent
<< 1 >> (32 - DOUBLE_EXP_BITS
- 1);
654 return ((exponent
== -1) || (! exponent
&& *p
* *(p
+1)));
660 * Implemented for Irix 4.x by Garrett A. Wollman
662 #ifdef USE_PROC_FS /* Target-dependent /proc support */
664 #include <sys/time.h>
665 #include <sys/procfs.h>
667 typedef unsigned int greg_t
; /* why isn't this defined? */
670 * See the comment in m68k-tdep.c regarding the utility of these functions.
674 supply_gregset (gregsetp
)
678 register greg_t
*regp
= (greg_t
*)(gregsetp
->gp_regs
);
680 /* FIXME: somewhere, there should be a #define for the meaning
681 of this magic number 32; we should use that. */
682 for(regno
= 0; regno
< 32; regno
++)
683 supply_register (regno
, (char *)(regp
+ regno
));
685 supply_register (PC_REGNUM
, (char *)&(gregsetp
->gp_pc
));
686 supply_register (HI_REGNUM
, (char *)&(gregsetp
->gp_mdhi
));
687 supply_register (LO_REGNUM
, (char *)&(gregsetp
->gp_mdlo
));
688 supply_register (PS_REGNUM
, (char *)&(gregsetp
->gp_cause
));
692 fill_gregset (gregsetp
, regno
)
697 register greg_t
*regp
= (greg_t
*)(gregsetp
->gp_regs
);
698 extern char registers
[];
700 /* same FIXME as above wrt 32*/
701 for (regi
= 0; regi
< 32; regi
++)
702 if ((regno
== -1) || (regno
== regi
))
703 *(regp
+ regno
) = *(greg_t
*) ®isters
[REGISTER_BYTE (regi
)];
705 if ((regno
== -1) || (regno
== PC_REGNUM
))
706 gregsetp
->gp_pc
= *(greg_t
*) ®isters
[REGISTER_BYTE (PC_REGNUM
)];
708 if ((regno
== -1) || (regno
== PS_REGNUM
))
709 gregsetp
->gp_cause
= *(greg_t
*) ®isters
[REGISTER_BYTE (PS_REGNUM
)];
711 if ((regno
== -1) || (regno
== HI_REGNUM
))
712 gregsetp
->gp_mdhi
= *(greg_t
*) ®isters
[REGISTER_BYTE (HI_REGNUM
)];
714 if ((regno
== -1) || (regno
== LO_REGNUM
))
715 gregsetp
->gp_mdlo
= *(greg_t
*) ®isters
[REGISTER_BYTE (LO_REGNUM
)];
719 * Now we do the same thing for floating-point registers.
720 * We don't bother to condition on FP0_REGNUM since any
721 * reasonable MIPS configuration has an R3010 in it.
723 * Again, see the comments in m68k-tdep.c.
727 supply_fpregset (fpregsetp
)
728 fpregset_t
*fpregsetp
;
732 for (regno
= 0; regno
< 32; regno
++)
733 supply_register (FP0_REGNUM
+ regno
,
734 (char *)&fpregsetp
->fp_r
.fp_regs
[regno
]);
736 supply_register (FCRCS_REGNUM
, (char *)&fpregsetp
->fp_csr
);
738 /* FIXME: how can we supply FCRIR_REGNUM? SGI doesn't tell us. */
742 fill_fpregset (fpregsetp
, regno
)
743 fpregset_t
*fpregsetp
;
748 extern char registers
[];
750 for (regi
= FP0_REGNUM
; regi
< FP0_REGNUM
+ 32; regi
++)
752 if ((regno
== -1) || (regno
== regi
))
754 from
= (char *) ®isters
[REGISTER_BYTE (regi
)];
755 to
= (char *) &(fpregsetp
->fp_r
.fp_regs
[regi
]);
756 bcopy(from
, to
, REGISTER_RAW_SIZE (regno
));
760 if ((regno
== -1) || (regno
== FCRCS_REGNUM
))
761 fpregsetp
->fp_csr
= *(unsigned *) ®isters
[REGISTER_BYTE(FCRCS_REGNUM
)];
764 #endif /* USE_PROC_FS */
766 /* To skip prologues, I use this predicate. Returns either PC
767 itself if the code at PC does not look like a function prologue,
768 PC+4 if it does (our caller does not need anything more fancy). */
770 CORE_ADDR
mips_skip_prologue(pc
)
778 /* For -g modules and most functions anyways the
779 first instruction adjusts the stack.
780 But we allow some number of stores before the stack adjustment.
781 (These are emitted by varags functions compiled by gcc-2.0. */
782 for (offset
= 0; offset
< 100; offset
+= 4) {
783 inst
= read_memory_integer(pc
+ offset
, 4);
784 if ((inst
& 0xffff0000) == 0x27bd0000) /* addiu $sp,$sp,offset */
785 return pc
+ offset
+ 4;
786 if ((inst
& 0xFFE00000) != 0xAFA00000) /* sw reg,n($sp) */
790 /* Well, it looks like a frameless. Let's make sure.
791 Note that we are not called on the current PC,
792 but on the function`s start PC, and I have definitely
793 seen optimized code that adjusts the SP quite later */
794 b
= block_for_pc(pc
);
797 f
= lookup_symbol(".gdbinfo.", b
, LABEL_NAMESPACE
, 0, NULL
);
799 /* Ideally, I would like to use the adjusted info
800 from mips_frame_info(), but for all practical
801 purposes it will not matter (and it would require
802 a different definition of SKIP_PROLOGUE())
804 Actually, it would not hurt to skip the storing
805 of arguments on the stack as well. */
806 if (((struct mips_extra_func_info
*)f
->value
.value
)->framesize
)
812 /* Figure out where the longjmp will land.
813 We expect the first arg to be a pointer to the jmp_buf structure from which
814 we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
815 This routine returns true on success. */
818 get_longjmp_target(pc
)
823 jb_addr
= read_register(A0_REGNUM
);
825 if (target_read_memory(jb_addr
+ JB_PC
* JB_ELEMENT_SIZE
, pc
,
829 SWAP_TARGET_AND_HOST(pc
, sizeof(CORE_ADDR
));