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)->pdr.adr) /* least address */
65 #define PROC_HIGH_ADDR(proc) ((proc)->pdr.iline) /* upper address bound */
66 #define PROC_FRAME_OFFSET(proc) ((proc)->pdr.frameoffset)
67 #define PROC_FRAME_REG(proc) ((proc)->pdr.framereg)
68 #define PROC_REG_MASK(proc) ((proc)->pdr.regmask)
69 #define PROC_FREG_MASK(proc) ((proc)->pdr.fregmask)
70 #define PROC_REG_OFFSET(proc) ((proc)->pdr.regoffset)
71 #define PROC_FREG_OFFSET(proc) ((proc)->pdr.fregoffset)
72 #define PROC_PC_REG(proc) ((proc)->pdr.pcreg)
73 #define PROC_SYMBOL(proc) (*(struct symbol**)&(proc)->pdr.isym)
74 #define _PROC_MAGIC_ 0x0F0F0F0F
75 #define PROC_DESC_IS_DUMMY(proc) ((proc)->pdr.isym == _PROC_MAGIC_)
76 #define SET_PROC_DESC_IS_DUMMY(proc) ((proc)->pdr.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
= frame
->proc_desc
;
117 int pcreg
= proc_desc
? PROC_PC_REG(proc_desc
) : RA_REGNUM
;
119 if (proc_desc
&& PROC_DESC_IS_DUMMY(proc_desc
))
120 return read_memory_integer(frame
->frame
- 4, 4);
122 return read_next_frame_reg(frame
, pcreg
);
125 static struct mips_extra_func_info temp_proc_desc
;
126 static struct frame_saved_regs temp_saved_regs
;
129 heuristic_proc_start(pc
)
132 CORE_ADDR start_pc
= pc
;
133 CORE_ADDR fence
= start_pc
- 200;
135 if (start_pc
== 0) return 0;
136 if (fence
< VM_MIN_ADDRESS
) fence
= VM_MIN_ADDRESS
;
138 /* search back for previous return */
139 for (start_pc
-= 4; ; start_pc
-= 4)
140 if (start_pc
< fence
) return 0;
141 else if (ABOUT_TO_RETURN(start_pc
))
144 start_pc
+= 8; /* skip return, and its delay slot */
146 /* skip nops (usually 1) 0 - is this */
147 while (start_pc
< pc
&& read_memory_integer (start_pc
, 4) == 0)
153 static mips_extra_func_info_t
154 heuristic_proc_desc(start_pc
, limit_pc
, next_frame
)
155 CORE_ADDR start_pc
, limit_pc
;
158 CORE_ADDR sp
= next_frame
? next_frame
->frame
: read_register (SP_REGNUM
);
161 int has_frame_reg
= 0;
162 int reg30
; /* Value of $r30. Used by gcc for frame-pointer */
163 unsigned long reg_mask
= 0;
165 if (start_pc
== 0) return NULL
;
166 bzero(&temp_proc_desc
, sizeof(temp_proc_desc
));
167 bzero(&temp_saved_regs
, sizeof(struct frame_saved_regs
));
168 if (start_pc
+ 200 < limit_pc
) limit_pc
= start_pc
+ 200;
171 for (cur_pc
= start_pc
; cur_pc
< limit_pc
; cur_pc
+= 4) {
175 status
= read_memory_nobpt (cur_pc
, &word
, 4);
176 if (status
) memory_error (status
, cur_pc
);
177 SWAP_TARGET_AND_HOST (&word
, sizeof (word
));
178 if ((word
& 0xFFFF0000) == 0x27bd0000) /* addiu $sp,$sp,-i */
179 frame_size
+= (-word
) & 0xFFFF;
180 else if ((word
& 0xFFFF0000) == 0x23bd0000) /* addu $sp,$sp,-i */
181 frame_size
+= (-word
) & 0xFFFF;
182 else if ((word
& 0xFFE00000) == 0xafa00000) { /* sw reg,offset($sp) */
183 int reg
= (word
& 0x001F0000) >> 16;
184 reg_mask
|= 1 << reg
;
185 temp_saved_regs
.regs
[reg
] = sp
+ (short)word
;
187 else if ((word
& 0xFFFF0000) == 0x27be0000) { /* addiu $30,$sp,size */
188 if ((unsigned short)word
!= frame_size
)
189 reg30
= sp
+ (unsigned short)word
;
190 else if (!has_frame_reg
) {
193 reg30
= read_next_frame_reg(next_frame
, 30);
194 alloca_adjust
= reg30
- (sp
+ (unsigned short)word
);
195 if (alloca_adjust
> 0) {
196 /* FP > SP + frame_size. This may be because
197 /* of an alloca or somethings similar.
198 * Fix sp to "pre-alloca" value, and try again.
205 else if ((word
& 0xFFE00000) == 0xafc00000) { /* sw reg,offset($30) */
206 int reg
= (word
& 0x001F0000) >> 16;
207 reg_mask
|= 1 << reg
;
208 temp_saved_regs
.regs
[reg
] = reg30
+ (short)word
;
212 PROC_FRAME_REG(&temp_proc_desc
) = 30;
213 PROC_FRAME_OFFSET(&temp_proc_desc
) = 0;
216 PROC_FRAME_REG(&temp_proc_desc
) = SP_REGNUM
;
217 PROC_FRAME_OFFSET(&temp_proc_desc
) = frame_size
;
219 PROC_REG_MASK(&temp_proc_desc
) = reg_mask
;
220 PROC_PC_REG(&temp_proc_desc
) = RA_REGNUM
;
221 return &temp_proc_desc
;
224 static mips_extra_func_info_t
225 find_proc_desc(pc
, next_frame
)
229 mips_extra_func_info_t proc_desc
;
230 struct block
*b
= block_for_pc(pc
);
232 b
? lookup_symbol(".gdbinfo.", b
, LABEL_NAMESPACE
, 0, NULL
) : NULL
;
236 /* IF this is the topmost frame AND
237 * (this proc does not have debugging information OR
238 * the PC is in the procedure prologue)
239 * THEN create a "heuristic" proc_desc (by analyzing
240 * the actual code) to replace the "official" proc_desc.
242 proc_desc
= (mips_extra_func_info_t
)SYMBOL_VALUE(sym
);
243 if (next_frame
== NULL
) {
244 struct symtab_and_line val
;
245 struct symbol
*proc_symbol
=
246 PROC_DESC_IS_DUMMY(proc_desc
) ? 0 : PROC_SYMBOL(proc_desc
);
249 val
= find_pc_line (BLOCK_START
250 (SYMBOL_BLOCK_VALUE(proc_symbol
)),
252 val
.pc
= val
.end
? val
.end
: pc
;
254 if (!proc_symbol
|| pc
< val
.pc
) {
255 mips_extra_func_info_t found_heuristic
=
256 heuristic_proc_desc(PROC_LOW_ADDR(proc_desc
),
258 if (found_heuristic
) proc_desc
= found_heuristic
;
264 /* Is linked_proc_desc_table really necessary? It only seems to be used
265 by procedure call dummys. However, the procedures being called ought
266 to have their own proc_descs, and even if they don't,
267 heuristic_proc_desc knows how to create them! */
269 register struct linked_proc_info
*link
;
270 for (link
= linked_proc_desc_table
; link
; link
= link
->next
)
271 if (PROC_LOW_ADDR(&link
->info
) <= pc
272 && PROC_HIGH_ADDR(&link
->info
) > pc
)
275 heuristic_proc_desc(heuristic_proc_start(pc
), pc
, next_frame
);
280 mips_extra_func_info_t cached_proc_desc
;
283 mips_frame_chain(frame
)
286 mips_extra_func_info_t proc_desc
;
287 CORE_ADDR saved_pc
= FRAME_SAVED_PC(frame
);
289 if (saved_pc
== 0 || inside_entry_file (saved_pc
))
292 proc_desc
= find_proc_desc(saved_pc
, frame
);
296 cached_proc_desc
= proc_desc
;
297 return read_next_frame_reg(frame
, PROC_FRAME_REG(proc_desc
))
298 + PROC_FRAME_OFFSET(proc_desc
);
302 init_extra_frame_info(fci
)
303 struct frame_info
*fci
;
305 extern struct obstack frame_cache_obstack
;
306 /* Use proc_desc calculated in frame_chain */
307 mips_extra_func_info_t proc_desc
= fci
->next
? cached_proc_desc
:
308 find_proc_desc(fci
->pc
, fci
->next
);
310 fci
->saved_regs
= (struct frame_saved_regs
*)
311 obstack_alloc (&frame_cache_obstack
, sizeof(struct frame_saved_regs
));
312 bzero(fci
->saved_regs
, sizeof(struct frame_saved_regs
));
314 proc_desc
== &temp_proc_desc
? 0 : proc_desc
;
318 CORE_ADDR reg_position
;
320 /* r0 bit means kernel trap */
321 int kernel_trap
= PROC_REG_MASK(proc_desc
) & 1;
323 /* Fixup frame-pointer - only needed for top frame */
324 /* This may not be quite right, if procedure has a real frame register */
325 if (fci
->pc
== PROC_LOW_ADDR(proc_desc
))
326 fci
->frame
= read_register (SP_REGNUM
);
328 fci
->frame
= READ_FRAME_REG(fci
, PROC_FRAME_REG(proc_desc
))
329 + PROC_FRAME_OFFSET(proc_desc
);
331 if (proc_desc
== &temp_proc_desc
)
332 *fci
->saved_regs
= temp_saved_regs
;
335 /* find which general-purpose registers were saved */
336 reg_position
= fci
->frame
+ PROC_REG_OFFSET(proc_desc
);
337 mask
= kernel_trap
? 0xFFFFFFFF : PROC_REG_MASK(proc_desc
);
338 for (ireg
= 31; mask
; --ireg
, mask
<<= 1)
339 if (mask
& 0x80000000)
341 fci
->saved_regs
->regs
[ireg
] = reg_position
;
344 /* find which floating-point registers were saved */
345 reg_position
= fci
->frame
+ PROC_FREG_OFFSET(proc_desc
);
346 /* The freg_offset points to where the first *double* register is saved.
347 * So skip to the high-order word. */
349 mask
= kernel_trap
? 0xFFFFFFFF : PROC_FREG_MASK(proc_desc
);
350 for (ireg
= 31; mask
; --ireg
, mask
<<= 1)
351 if (mask
& 0x80000000)
353 fci
->saved_regs
->regs
[FP0_REGNUM
+ireg
] = reg_position
;
358 /* hack: if argument regs are saved, guess these contain args */
359 if ((PROC_REG_MASK(proc_desc
) & 0xF0) == 0) fci
->num_args
= -1;
360 else if ((PROC_REG_MASK(proc_desc
) & 0x80) == 0) fci
->num_args
= 4;
361 else if ((PROC_REG_MASK(proc_desc
) & 0x40) == 0) fci
->num_args
= 3;
362 else if ((PROC_REG_MASK(proc_desc
) & 0x20) == 0) fci
->num_args
= 2;
363 else if ((PROC_REG_MASK(proc_desc
) & 0x10) == 0) fci
->num_args
= 1;
365 fci
->saved_regs
->regs
[PC_REGNUM
] = fci
->saved_regs
->regs
[RA_REGNUM
];
371 mips_push_arguments(nargs
, args
, sp
, struct_return
, struct_addr
)
376 CORE_ADDR struct_addr
;
380 int accumulate_size
= struct_return
? 4 : 0;
381 struct mips_arg
{ char *contents
; int len
; int offset
; };
382 struct mips_arg
*mips_args
=
383 (struct mips_arg
*)alloca(nargs
* sizeof(struct mips_arg
));
384 register struct mips_arg
*m_arg
;
385 for (i
= 0, m_arg
= mips_args
; i
< nargs
; i
++, m_arg
++) {
386 extern value
value_arg_coerce();
387 value arg
= value_arg_coerce (args
[i
]);
388 m_arg
->len
= TYPE_LENGTH (VALUE_TYPE (arg
));
389 /* This entire mips-specific routine is because doubles must be aligned
390 * on 8-byte boundaries. It still isn't quite right, because MIPS decided
391 * to align 'struct {int a, b}' on 4-byte boundaries (even though this
392 * breaks their varargs implementation...). A correct solution
393 * requires an simulation of gcc's 'alignof' (and use of 'alignof'
394 * in stdarg.h/varargs.h).
396 if (m_arg
->len
> 4) accumulate_size
= (accumulate_size
+ 7) & -8;
397 m_arg
->offset
= accumulate_size
;
398 accumulate_size
= (accumulate_size
+ m_arg
->len
+ 3) & -4;
399 m_arg
->contents
= VALUE_CONTENTS(arg
);
401 accumulate_size
= (accumulate_size
+ 7) & (-8);
402 if (accumulate_size
< 16) accumulate_size
= 16;
403 sp
-= accumulate_size
;
404 for (i
= nargs
; m_arg
--, --i
>= 0; )
405 write_memory(sp
+ m_arg
->offset
, m_arg
->contents
, m_arg
->len
);
408 write_memory(sp
, &buf
, sizeof(CORE_ADDR
));
413 /* MASK(i,j) == (1<<i) + (1<<(i+1)) + ... + (1<<j)). Assume i<=j<31. */
414 #define MASK(i,j) ((1 << (j)+1)-1 ^ (1 << (i))-1)
417 mips_push_dummy_frame()
420 struct linked_proc_info
*link
= (struct linked_proc_info
*)
421 xmalloc(sizeof(struct linked_proc_info
));
422 mips_extra_func_info_t proc_desc
= &link
->info
;
423 CORE_ADDR sp
= read_register (SP_REGNUM
);
424 CORE_ADDR save_address
;
425 REGISTER_TYPE buffer
;
426 link
->next
= linked_proc_desc_table
;
427 linked_proc_desc_table
= link
;
428 #define PUSH_FP_REGNUM 16 /* must be a register preserved across calls */
429 #define GEN_REG_SAVE_MASK MASK(1,16)|MASK(24,28)|(1<<31)
430 #define GEN_REG_SAVE_COUNT 22
431 #define FLOAT_REG_SAVE_MASK MASK(0,19)
432 #define FLOAT_REG_SAVE_COUNT 20
433 #define SPECIAL_REG_SAVE_COUNT 4
435 * The registers we must save are all those not preserved across
436 * procedure calls. Dest_Reg (see tm-mips.h) must also be saved.
437 * In addition, we must save the PC, and PUSH_FP_REGNUM.
438 * (Ideally, we should also save MDLO/-HI and FP Control/Status reg.)
440 * Dummy frame layout:
443 * Saved MMHI, MMLO, FPC_CSR
448 * Saved D18 (i.e. F19, F18)
450 * Saved D0 (i.e. F1, F0)
451 * CALL_DUMMY (subroutine stub; see m-mips.h)
452 * Parameter build area (not yet implemented)
455 PROC_REG_MASK(proc_desc
) = GEN_REG_SAVE_MASK
;
456 PROC_FREG_MASK(proc_desc
) = FLOAT_REG_SAVE_MASK
;
457 PROC_REG_OFFSET(proc_desc
) = /* offset of (Saved R31) from FP */
458 -sizeof(long) - 4 * SPECIAL_REG_SAVE_COUNT
;
459 PROC_FREG_OFFSET(proc_desc
) = /* offset of (Saved D18) from FP */
460 -sizeof(double) - 4 * (SPECIAL_REG_SAVE_COUNT
+ GEN_REG_SAVE_COUNT
);
461 /* save general registers */
462 save_address
= sp
+ PROC_REG_OFFSET(proc_desc
);
463 for (ireg
= 32; --ireg
>= 0; )
464 if (PROC_REG_MASK(proc_desc
) & (1 << ireg
))
466 buffer
= read_register (ireg
);
467 write_memory (save_address
, &buffer
, sizeof(REGISTER_TYPE
));
470 /* save floating-points registers */
471 save_address
= sp
+ PROC_FREG_OFFSET(proc_desc
);
472 for (ireg
= 32; --ireg
>= 0; )
473 if (PROC_FREG_MASK(proc_desc
) & (1 << ireg
))
475 buffer
= read_register (ireg
+ FP0_REGNUM
);
476 write_memory (save_address
, &buffer
, 4);
479 write_register (PUSH_FP_REGNUM
, sp
);
480 PROC_FRAME_REG(proc_desc
) = PUSH_FP_REGNUM
;
481 PROC_FRAME_OFFSET(proc_desc
) = 0;
482 buffer
= read_register (PC_REGNUM
);
483 write_memory (sp
- 4, &buffer
, sizeof(REGISTER_TYPE
));
484 buffer
= read_register (HI_REGNUM
);
485 write_memory (sp
- 8, &buffer
, sizeof(REGISTER_TYPE
));
486 buffer
= read_register (LO_REGNUM
);
487 write_memory (sp
- 12, &buffer
, sizeof(REGISTER_TYPE
));
488 buffer
= read_register (FCRCS_REGNUM
);
489 write_memory (sp
- 16, &buffer
, sizeof(REGISTER_TYPE
));
490 sp
-= 4 * (GEN_REG_SAVE_COUNT
+FLOAT_REG_SAVE_COUNT
+SPECIAL_REG_SAVE_COUNT
);
491 write_register (SP_REGNUM
, sp
);
492 PROC_LOW_ADDR(proc_desc
) = sp
- CALL_DUMMY_SIZE
+ CALL_DUMMY_START_OFFSET
;
493 PROC_HIGH_ADDR(proc_desc
) = sp
;
494 SET_PROC_DESC_IS_DUMMY(proc_desc
);
495 PROC_PC_REG(proc_desc
) = RA_REGNUM
;
500 { register int regnum
;
501 FRAME frame
= get_current_frame ();
502 CORE_ADDR new_sp
= frame
->frame
;
503 mips_extra_func_info_t proc_desc
= (mips_extra_func_info_t
)frame
->proc_desc
;
504 if (PROC_DESC_IS_DUMMY(proc_desc
))
506 struct linked_proc_info
**ptr
= &linked_proc_desc_table
;;
507 for (; &ptr
[0]->info
!= proc_desc
; ptr
= &ptr
[0]->next
)
508 if (ptr
[0] == NULL
) abort();
511 write_register (HI_REGNUM
, read_memory_integer(new_sp
- 8, 4));
512 write_register (LO_REGNUM
, read_memory_integer(new_sp
- 12, 4));
513 write_register (FCRCS_REGNUM
, read_memory_integer(new_sp
- 16, 4));
515 write_register (PC_REGNUM
, FRAME_SAVED_PC(frame
));
516 if (frame
->proc_desc
) {
517 for (regnum
= 32; --regnum
>= 0; )
518 if (PROC_REG_MASK(proc_desc
) & (1 << regnum
))
519 write_register (regnum
,
520 read_memory_integer (frame
->saved_regs
->regs
[regnum
], 4));
521 for (regnum
= 32; --regnum
>= 0; )
522 if (PROC_FREG_MASK(proc_desc
) & (1 << regnum
))
523 write_register (regnum
+ FP0_REGNUM
,
524 read_memory_integer (frame
->saved_regs
->regs
[regnum
+ FP0_REGNUM
], 4));
526 write_register (SP_REGNUM
, new_sp
);
527 flush_cached_frames ();
528 set_current_frame (create_new_frame (new_sp
, read_pc ()));
532 mips_print_register(regnum
, all
)
535 unsigned char raw_buffer
[MAX_REGISTER_RAW_SIZE
];
538 /* Get the data in raw format. */
539 if (read_relative_register_raw_bytes (regnum
, raw_buffer
))
541 printf_filtered ("%s: [Invalid]", reg_names
[regnum
]);
545 /* If an even floating pointer register, also print as double. */
546 if (regnum
>= FP0_REGNUM
&& regnum
< FP0_REGNUM
+32
547 && !((regnum
-FP0_REGNUM
) & 1)) {
548 read_relative_register_raw_bytes (regnum
+1, raw_buffer
+4);
549 printf_filtered ("(d%d: ", regnum
-FP0_REGNUM
);
550 val_print (builtin_type_double
, raw_buffer
, 0,
551 stdout
, 0, 1, 0, Val_pretty_default
);
552 printf_filtered ("); ");
554 fputs_filtered (reg_names
[regnum
], stdout
);
555 #ifndef NUMERIC_REG_NAMES
557 printf_filtered ("(r%d): ", regnum
);
560 printf_filtered (": ");
562 /* If virtual format is floating, print it that way. */
563 if (TYPE_CODE (REGISTER_VIRTUAL_TYPE (regnum
)) == TYPE_CODE_FLT
564 && ! INVALID_FLOAT (raw_buffer
, REGISTER_VIRTUAL_SIZE(regnum
))) {
565 val_print (REGISTER_VIRTUAL_TYPE (regnum
), raw_buffer
, 0,
566 stdout
, 0, 1, 0, Val_pretty_default
);
568 /* Else print as integer in hex. */
573 bcopy (raw_buffer
, &val
, sizeof (long));
574 SWAP_TARGET_AND_HOST ((char *)&val
, sizeof (long));
576 printf_filtered ("0");
578 printf_filtered (local_hex_format(), val
);
580 printf_filtered ("%s=%d", local_hex_string(val
), val
);
584 /* 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. */
613 mips_frame_num_args(fip
)
617 struct chain_info_t
*p
;
619 p
= mips_find_cached_frame(FRAME_FP(fip
));
621 return p
->the_info
.numargs
;
627 /* Bad floats: Returns 0 if P points to a valid IEEE floating point number,
628 1 if P points to a denormalized number or a NaN. LEN says whether this is
629 a single-precision or double-precision float */
630 #define SINGLE_EXP_BITS 8
631 #define DOUBLE_EXP_BITS 11
640 exponent
= exponent
<< 1 >> (32 - SINGLE_EXP_BITS
- 1);
641 return ((exponent
== -1) || (! exponent
&& *p
));
646 exponent
= exponent
<< 1 >> (32 - DOUBLE_EXP_BITS
- 1);
647 return ((exponent
== -1) || (! exponent
&& *p
* *(p
+1)));
653 * Implemented for Irix 4.x by Garrett A. Wollman
655 #ifdef USE_PROC_FS /* Target-dependent /proc support */
657 #include <sys/time.h>
658 #include <sys/procfs.h>
660 typedef unsigned int greg_t
; /* why isn't this defined? */
663 * See the comment in m68k-tdep.c regarding the utility of these functions.
667 supply_gregset (gregsetp
)
671 register greg_t
*regp
= (greg_t
*)(gregsetp
->gp_regs
);
673 /* FIXME: somewhere, there should be a #define for the meaning
674 of this magic number 32; we should use that. */
675 for(regno
= 0; regno
< 32; regno
++)
676 supply_register (regno
, (char *)(regp
+ regno
));
678 supply_register (PC_REGNUM
, (char *)&(gregsetp
->gp_pc
));
679 supply_register (HI_REGNUM
, (char *)&(gregsetp
->gp_mdhi
));
680 supply_register (LO_REGNUM
, (char *)&(gregsetp
->gp_mdlo
));
681 supply_register (PS_REGNUM
, (char *)&(gregsetp
->gp_cause
));
685 fill_gregset (gregsetp
, regno
)
690 register greg_t
*regp
= (greg_t
*)(gregsetp
->gp_regs
);
691 extern char registers
[];
693 /* same FIXME as above wrt 32*/
694 for (regi
= 0; regi
< 32; regi
++)
695 if ((regno
== -1) || (regno
== regi
))
696 *(regp
+ regno
) = *(greg_t
*) ®isters
[REGISTER_BYTE (regi
)];
698 if ((regno
== -1) || (regno
== PC_REGNUM
))
699 gregsetp
->gp_pc
= *(greg_t
*) ®isters
[REGISTER_BYTE (PC_REGNUM
)];
701 if ((regno
== -1) || (regno
== PS_REGNUM
))
702 gregsetp
->gp_cause
= *(greg_t
*) ®isters
[REGISTER_BYTE (PS_REGNUM
)];
704 if ((regno
== -1) || (regno
== HI_REGNUM
))
705 gregsetp
->gp_mdhi
= *(greg_t
*) ®isters
[REGISTER_BYTE (HI_REGNUM
)];
707 if ((regno
== -1) || (regno
== LO_REGNUM
))
708 gregsetp
->gp_mdlo
= *(greg_t
*) ®isters
[REGISTER_BYTE (LO_REGNUM
)];
712 * Now we do the same thing for floating-point registers.
713 * We don't bother to condition on FP0_REGNUM since any
714 * reasonable MIPS configuration has an R3010 in it.
716 * Again, see the comments in m68k-tdep.c.
720 supply_fpregset (fpregsetp
)
721 fpregset_t
*fpregsetp
;
725 for (regno
= 0; regno
< 32; regno
++)
726 supply_register (FP0_REGNUM
+ regno
,
727 (char *)&fpregsetp
->fp_r
.fp_regs
[regno
]);
729 supply_register (FCRCS_REGNUM
, (char *)&fpregsetp
->fp_csr
);
731 /* FIXME: how can we supply FCRIR_REGNUM? SGI doesn't tell us. */
735 fill_fpregset (fpregsetp
, regno
)
736 fpregset_t
*fpregsetp
;
741 extern char registers
[];
743 for (regi
= FP0_REGNUM
; regi
< FP0_REGNUM
+ 32; regi
++)
745 if ((regno
== -1) || (regno
== regi
))
747 from
= (char *) ®isters
[REGISTER_BYTE (regi
)];
748 to
= (char *) &(fpregsetp
->fp_r
.fp_regs
[regi
]);
749 bcopy(from
, to
, REGISTER_RAW_SIZE (regno
));
753 if ((regno
== -1) || (regno
== FCRCS_REGNUM
))
754 fpregsetp
->fp_csr
= *(unsigned *) ®isters
[REGISTER_BYTE(FCRCS_REGNUM
)];
757 #endif /* USE_PROC_FS */
759 /* To skip prologues, I use this predicate. Returns either PC
760 itself if the code at PC does not look like a function prologue,
761 PC+4 if it does (our caller does not need anything more fancy). */
764 mips_skip_prologue(pc
)
772 /* For -g modules and most functions anyways the
773 first instruction adjusts the stack.
774 But we allow some number of stores before the stack adjustment.
775 (These are emitted by varags functions compiled by gcc-2.0. */
776 for (offset
= 0; offset
< 100; offset
+= 4) {
777 inst
= read_memory_integer(pc
+ offset
, 4);
778 if ((inst
& 0xffff0000) == 0x27bd0000) /* addiu $sp,$sp,offset */
779 return pc
+ offset
+ 4;
780 if ((inst
& 0xFFE00000) != 0xAFA00000) /* sw reg,n($sp) */
784 /* Well, it looks like a frameless. Let's make sure.
785 Note that we are not called on the current PC,
786 but on the function`s start PC, and I have definitely
787 seen optimized code that adjusts the SP quite later */
788 b
= block_for_pc(pc
);
791 f
= lookup_symbol(".gdbinfo.", b
, LABEL_NAMESPACE
, 0, NULL
);
793 /* Ideally, I would like to use the adjusted info
794 from mips_frame_info(), but for all practical
795 purposes it will not matter (and it would require
796 a different definition of SKIP_PROLOGUE())
798 Actually, it would not hurt to skip the storing
799 of arguments on the stack as well. */
800 if (((mips_extra_func_info_t
)SYMBOL_VALUE(f
))->pdr
.frameoffset
)
806 /* Figure out where the longjmp will land.
807 We expect the first arg to be a pointer to the jmp_buf structure from which
808 we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
809 This routine returns true on success. */
812 get_longjmp_target(pc
)
817 jb_addr
= read_register(A0_REGNUM
);
819 if (target_read_memory(jb_addr
+ JB_PC
* JB_ELEMENT_SIZE
, pc
,
823 SWAP_TARGET_AND_HOST(pc
, sizeof(CORE_ADDR
));