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
- 200;
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 SWAP_TARGET_AND_HOST (&word
, sizeof (word
));
186 if ((word
& 0xFFFF0000) == 0x27bd0000) /* addiu $sp,$sp,-i */
187 frame_size
+= (-word
) & 0xFFFF;
188 else if ((word
& 0xFFFF0000) == 0x23bd0000) /* addu $sp,$sp,-i */
189 frame_size
+= (-word
) & 0xFFFF;
190 else if ((word
& 0xFFE00000) == 0xafa00000) { /* sw reg,offset($sp) */
191 int reg
= (word
& 0x001F0000) >> 16;
192 reg_mask
|= 1 << reg
;
193 temp_saved_regs
.regs
[reg
] = sp
+ (short)word
;
195 else if ((word
& 0xFFFF0000) == 0x27be0000) { /* addiu $30,$sp,size */
196 if ((unsigned short)word
!= frame_size
)
197 reg30
= sp
+ (unsigned short)word
;
198 else if (!has_frame_reg
) {
201 reg30
= read_next_frame_reg(next_frame
, 30);
202 alloca_adjust
= reg30
- (sp
+ (unsigned short)word
);
203 if (alloca_adjust
> 0) {
204 /* FP > SP + frame_size. This may be because
205 /* of an alloca or somethings similar.
206 * Fix sp to "pre-alloca" value, and try again.
213 else if ((word
& 0xFFE00000) == 0xafc00000) { /* sw reg,offset($30) */
214 int reg
= (word
& 0x001F0000) >> 16;
215 reg_mask
|= 1 << reg
;
216 temp_saved_regs
.regs
[reg
] = reg30
+ (short)word
;
220 PROC_FRAME_REG(&temp_proc_desc
) = 30;
221 PROC_FRAME_OFFSET(&temp_proc_desc
) = 0;
224 PROC_FRAME_REG(&temp_proc_desc
) = SP_REGNUM
;
225 PROC_FRAME_OFFSET(&temp_proc_desc
) = frame_size
;
227 PROC_REG_MASK(&temp_proc_desc
) = reg_mask
;
228 PROC_PC_REG(&temp_proc_desc
) = RA_REGNUM
;
229 return &temp_proc_desc
;
232 mips_extra_func_info_t
233 find_proc_desc(pc
, next_frame
)
237 mips_extra_func_info_t proc_desc
;
238 extern struct block
*block_for_pc();
239 struct block
*b
= block_for_pc(pc
);
242 b
? lookup_symbol(".gdbinfo.", b
, LABEL_NAMESPACE
, 0, NULL
) : NULL
;
245 /* IF this is the topmost frame AND
246 * (this proc does not have debugging information OR
247 * the PC is in the procedure prologue)
248 * THEN create a "hueristic" proc_desc (by analyzing
249 * the actual code) to replace the "official" proc_desc.
251 proc_desc
= (struct mips_extra_func_info
*)sym
->value
.value
;
252 if (next_frame
== NULL
) {
253 struct symtab_and_line val
;
254 struct symbol
*proc_symbol
=
255 PROC_DESC_IS_DUMMY(proc_desc
) ? 0 : PROC_SYMBOL(proc_desc
);
257 val
= find_pc_line (BLOCK_START
258 (SYMBOL_BLOCK_VALUE(proc_symbol
)),
260 val
.pc
= val
.end
? val
.end
: pc
;
262 if (!proc_symbol
|| pc
< val
.pc
) {
263 mips_extra_func_info_t found_heuristic
=
264 heuristic_proc_desc(PROC_LOW_ADDR(proc_desc
),
266 if (found_heuristic
) proc_desc
= found_heuristic
;
272 register struct linked_proc_info
*link
;
273 for (link
= linked_proc_desc_table
; link
; link
= link
->next
)
274 if (PROC_LOW_ADDR(&link
->info
) <= pc
275 && PROC_HIGH_ADDR(&link
->info
) > pc
)
278 heuristic_proc_desc(heuristic_proc_start(pc
), pc
, next_frame
);
283 mips_extra_func_info_t cached_proc_desc
;
285 FRAME_ADDR
mips_frame_chain(frame
)
288 mips_extra_func_info_t proc_desc
;
289 CORE_ADDR saved_pc
= FRAME_SAVED_PC(frame
);
290 if (current_objfile
-> ei
.entry_file_lowpc
)
291 { /* has at least the __start symbol */
292 if (saved_pc
== 0 || inside_entry_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
[MAX_REGISTER_RAW_SIZE
];
545 /* Get the data in raw format. */
546 if (read_relative_register_raw_bytes (regnum
, raw_buffer
))
548 printf_filtered ("%s: [Invalid]", reg_names
[regnum
]);
552 /* If an even floating pointer register, also print as double. */
553 if (regnum
>= FP0_REGNUM
&& regnum
< FP0_REGNUM
+32
554 && !((regnum
-FP0_REGNUM
) & 1)) {
555 read_relative_register_raw_bytes (regnum
+1, raw_buffer
+4);
556 printf_filtered ("(d%d: ", regnum
-FP0_REGNUM
);
557 val_print (builtin_type_double
, raw_buffer
, 0,
558 stdout
, 0, 1, 0, Val_pretty_default
);
559 printf_filtered ("); ");
561 fputs_filtered (reg_names
[regnum
], stdout
);
562 #ifndef NUMERIC_REG_NAMES
564 printf_filtered ("(r%d): ", regnum
);
567 printf_filtered (": ");
569 /* If virtual format is floating, print it that way. */
570 if (TYPE_CODE (REGISTER_VIRTUAL_TYPE (regnum
)) == TYPE_CODE_FLT
571 && ! INVALID_FLOAT (raw_buffer
, REGISTER_VIRTUAL_SIZE(regnum
))) {
572 val_print (REGISTER_VIRTUAL_TYPE (regnum
), raw_buffer
, 0,
573 stdout
, 0, 1, 0, Val_pretty_default
);
575 /* Else print as integer in hex. */
580 bcopy (raw_buffer
, &val
, sizeof (long));
581 SWAP_TARGET_AND_HOST ((char *)&val
, sizeof (long));
583 printf_filtered ("0");
585 printf_filtered (local_hex_format(), val
);
587 printf_filtered ("%s=%d", local_hex_string(val
), val
);
591 /* Replacement for generic do_registers_info. */
592 mips_do_registers_info (regnum
, fpregs
)
597 mips_print_register (regnum
, 0);
598 printf_filtered ("\n");
601 for (regnum
= 0; regnum
< NUM_REGS
; ) {
602 if ((!fpregs
) && regnum
>= FP0_REGNUM
&& regnum
<= FCRIR_REGNUM
) {
606 mips_print_register (regnum
, 1);
608 if ((regnum
& 3) == 0 || regnum
== NUM_REGS
)
609 printf_filtered (";\n");
611 printf_filtered ("; ");
615 /* Return number of args passed to a frame. described by FIP.
616 Can return -1, meaning no way to tell. */
618 mips_frame_num_args(fip
)
622 struct chain_info_t
*p
;
624 p
= mips_find_cached_frame(FRAME_FP(fip
));
626 return p
->the_info
.numargs
;
632 /* Bad floats: Returns 0 if P points to a valid IEEE floating point number,
633 1 if P points to a denormalized number or a NaN. LEN says whether this is
634 a single-precision or double-precision float */
635 #define SINGLE_EXP_BITS 8
636 #define DOUBLE_EXP_BITS 11
645 exponent
= exponent
<< 1 >> (32 - SINGLE_EXP_BITS
- 1);
646 return ((exponent
== -1) || (! exponent
&& *p
));
651 exponent
= exponent
<< 1 >> (32 - DOUBLE_EXP_BITS
- 1);
652 return ((exponent
== -1) || (! exponent
&& *p
* *(p
+1)));
658 * Implemented for Irix 4.x by Garrett A. Wollman
660 #ifdef USE_PROC_FS /* Target-dependent /proc support */
662 #include <sys/time.h>
663 #include <sys/procfs.h>
665 typedef unsigned int greg_t
; /* why isn't this defined? */
668 * See the comment in m68k-tdep.c regarding the utility of these functions.
672 supply_gregset (gregsetp
)
676 register greg_t
*regp
= (greg_t
*)(gregsetp
->gp_regs
);
678 /* FIXME: somewhere, there should be a #define for the meaning
679 of this magic number 32; we should use that. */
680 for(regno
= 0; regno
< 32; regno
++)
681 supply_register (regno
, (char *)(regp
+ regno
));
683 supply_register (PC_REGNUM
, (char *)&(gregsetp
->gp_pc
));
684 supply_register (HI_REGNUM
, (char *)&(gregsetp
->gp_mdhi
));
685 supply_register (LO_REGNUM
, (char *)&(gregsetp
->gp_mdlo
));
686 supply_register (PS_REGNUM
, (char *)&(gregsetp
->gp_cause
));
690 fill_gregset (gregsetp
, regno
)
695 register greg_t
*regp
= (greg_t
*)(gregsetp
->gp_regs
);
696 extern char registers
[];
698 /* same FIXME as above wrt 32*/
699 for (regi
= 0; regi
< 32; regi
++)
700 if ((regno
== -1) || (regno
== regi
))
701 *(regp
+ regno
) = *(greg_t
*) ®isters
[REGISTER_BYTE (regi
)];
703 if ((regno
== -1) || (regno
== PC_REGNUM
))
704 gregsetp
->gp_pc
= *(greg_t
*) ®isters
[REGISTER_BYTE (PC_REGNUM
)];
706 if ((regno
== -1) || (regno
== PS_REGNUM
))
707 gregsetp
->gp_cause
= *(greg_t
*) ®isters
[REGISTER_BYTE (PS_REGNUM
)];
709 if ((regno
== -1) || (regno
== HI_REGNUM
))
710 gregsetp
->gp_mdhi
= *(greg_t
*) ®isters
[REGISTER_BYTE (HI_REGNUM
)];
712 if ((regno
== -1) || (regno
== LO_REGNUM
))
713 gregsetp
->gp_mdlo
= *(greg_t
*) ®isters
[REGISTER_BYTE (LO_REGNUM
)];
717 * Now we do the same thing for floating-point registers.
718 * We don't bother to condition on FP0_REGNUM since any
719 * reasonable MIPS configuration has an R3010 in it.
721 * Again, see the comments in m68k-tdep.c.
725 supply_fpregset (fpregsetp
)
726 fpregset_t
*fpregsetp
;
730 for (regno
= 0; regno
< 32; regno
++)
731 supply_register (FP0_REGNUM
+ regno
,
732 (char *)&fpregsetp
->fp_r
.fp_regs
[regno
]);
734 supply_register (FCRCS_REGNUM
, (char *)&fpregsetp
->fp_csr
);
736 /* FIXME: how can we supply FCRIR_REGNUM? SGI doesn't tell us. */
740 fill_fpregset (fpregsetp
, regno
)
741 fpregset_t
*fpregsetp
;
746 extern char registers
[];
748 for (regi
= FP0_REGNUM
; regi
< FP0_REGNUM
+ 32; regi
++)
750 if ((regno
== -1) || (regno
== regi
))
752 from
= (char *) ®isters
[REGISTER_BYTE (regi
)];
753 to
= (char *) &(fpregsetp
->fp_r
.fp_regs
[regi
]);
754 bcopy(from
, to
, REGISTER_RAW_SIZE (regno
));
758 if ((regno
== -1) || (regno
== FCRCS_REGNUM
))
759 fpregsetp
->fp_csr
= *(unsigned *) ®isters
[REGISTER_BYTE(FCRCS_REGNUM
)];
762 #endif /* USE_PROC_FS */
764 /* To skip prologues, I use this predicate. Returns either PC
765 itself if the code at PC does not look like a function prologue,
766 PC+4 if it does (our caller does not need anything more fancy). */
768 CORE_ADDR
mips_skip_prologue(pc
)
776 /* For -g modules and most functions anyways the
777 first instruction adjusts the stack.
778 But we allow some number of stores before the stack adjustment.
779 (These are emitted by varags functions compiled by gcc-2.0. */
780 for (offset
= 0; offset
< 100; offset
+= 4) {
781 inst
= read_memory_integer(pc
+ offset
, 4);
782 if ((inst
& 0xffff0000) == 0x27bd0000) /* addiu $sp,$sp,offset */
783 return pc
+ offset
+ 4;
784 if ((inst
& 0xFFE00000) != 0xAFA00000) /* sw reg,n($sp) */
788 /* Well, it looks like a frameless. Let's make sure.
789 Note that we are not called on the current PC,
790 but on the function`s start PC, and I have definitely
791 seen optimized code that adjusts the SP quite later */
792 b
= block_for_pc(pc
);
795 f
= lookup_symbol(".gdbinfo.", b
, LABEL_NAMESPACE
, 0, NULL
);
797 /* Ideally, I would like to use the adjusted info
798 from mips_frame_info(), but for all practical
799 purposes it will not matter (and it would require
800 a different definition of SKIP_PROLOGUE())
802 Actually, it would not hurt to skip the storing
803 of arguments on the stack as well. */
804 if (((struct mips_extra_func_info
*)f
->value
.value
)->framesize
)
810 /* Figure out where the longjmp will land.
811 We expect the first arg to be a pointer to the jmp_buf structure from which
812 we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
813 This routine returns true on success. */
816 get_longjmp_target(pc
)
821 jb_addr
= read_register(A0_REGNUM
);
823 if (target_read_memory(jb_addr
+ JB_PC
* JB_ELEMENT_SIZE
, pc
,
827 SWAP_TARGET_AND_HOST(pc
, sizeof(CORE_ADDR
));