1 /* Target-dependent code for the MIPS architecture, for GDB, the GNU Debugger.
2 Copyright 1988, 1989, 1990, 1991, 1992, 1993 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>
45 #define MIPSMAGIC MIPSELMAGIC
47 #define MIPSMAGIC MIPSEBMAGIC
51 #define VM_MIN_ADDRESS (unsigned)0x400000
53 #include <sys/user.h> /* After a.out.h */
58 /* Some MIPS boards don't support floating point, so we permit the
59 user to turn it off. */
62 #define PROC_LOW_ADDR(proc) ((proc)->pdr.adr) /* least address */
63 #define PROC_HIGH_ADDR(proc) ((proc)->pdr.iline) /* upper address bound */
64 #define PROC_FRAME_OFFSET(proc) ((proc)->pdr.frameoffset)
65 #define PROC_FRAME_REG(proc) ((proc)->pdr.framereg)
66 #define PROC_REG_MASK(proc) ((proc)->pdr.regmask)
67 #define PROC_FREG_MASK(proc) ((proc)->pdr.fregmask)
68 #define PROC_REG_OFFSET(proc) ((proc)->pdr.regoffset)
69 #define PROC_FREG_OFFSET(proc) ((proc)->pdr.fregoffset)
70 #define PROC_PC_REG(proc) ((proc)->pdr.pcreg)
71 #define PROC_SYMBOL(proc) (*(struct symbol**)&(proc)->pdr.isym)
72 #define _PROC_MAGIC_ 0x0F0F0F0F
73 #define PROC_DESC_IS_DUMMY(proc) ((proc)->pdr.isym == _PROC_MAGIC_)
74 #define SET_PROC_DESC_IS_DUMMY(proc) ((proc)->pdr.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 /* If it is the frame for sigtramp we have a complete sigcontext
91 immediately below the frame and we get the saved registers from there.
92 If the stack layout for sigtramp changes we might have to change these
93 constants and the companion fixup_sigtramp in mipsread.c */
94 #define SIGFRAME_BASE 0x12c /* sizeof(sigcontext) */
95 #define SIGFRAME_PC_OFF (-SIGFRAME_BASE + 2 * 4)
96 #define SIGFRAME_REGSAVE_OFF (-SIGFRAME_BASE + 3 * 4)
97 for (; fi
; fi
= fi
->next
)
98 if (in_sigtramp(fi
->pc
, 0)) {
100 if (regno
== PC_REGNUM
) offset
= SIGFRAME_PC_OFF
;
101 else if (regno
< 32) offset
= SIGFRAME_REGSAVE_OFF
+ regno
* 4;
103 return read_memory_integer(fi
->frame
+ offset
, 4);
105 else if (regno
== SP_REGNUM
) return fi
->frame
;
106 else if (fi
->saved_regs
->regs
[regno
])
107 return read_memory_integer(fi
->saved_regs
->regs
[regno
], 4);
108 return read_register(regno
);
112 mips_frame_saved_pc(frame
)
115 mips_extra_func_info_t proc_desc
= frame
->proc_desc
;
116 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 return read_next_frame_reg(frame
, pcreg
);
124 static struct mips_extra_func_info temp_proc_desc
;
125 static struct frame_saved_regs temp_saved_regs
;
127 /* This fencepost looks highly suspicious to me. Removing it also
128 seems suspicious as it could affect remote debugging across serial
129 lines. At the very least, this needs a warning message.
130 rich@cygnus.com 12mar93. */
133 heuristic_proc_start(pc
)
136 CORE_ADDR start_pc
= pc
;
137 CORE_ADDR fence
= start_pc
- 200;
139 if (start_pc
== 0) return 0;
140 if (fence
< VM_MIN_ADDRESS
) fence
= VM_MIN_ADDRESS
;
142 /* search back for previous return */
143 for (start_pc
-= 4; ; start_pc
-= 4)
144 if (start_pc
< fence
)
146 warning("Cannot find enclosing function for pc 0x%x", pc
);
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 static 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 PROC_LOW_ADDR(&temp_proc_desc
) = start_pc
;
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
, (char *)&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 static mips_extra_func_info_t
235 find_proc_desc(pc
, next_frame
)
239 mips_extra_func_info_t proc_desc
;
240 struct block
*b
= block_for_pc(pc
);
242 b
? lookup_symbol(MIPS_EFI_SYMBOL_NAME
, b
, LABEL_NAMESPACE
, 0, NULL
) : NULL
;
246 /* IF this is the topmost frame AND
247 * (this proc does not have debugging information OR
248 * the PC is in the procedure prologue)
249 * THEN create a "heuristic" proc_desc (by analyzing
250 * the actual code) to replace the "official" proc_desc.
252 proc_desc
= (mips_extra_func_info_t
)SYMBOL_VALUE(sym
);
253 if (next_frame
== NULL
) {
254 struct symtab_and_line val
;
255 struct symbol
*proc_symbol
=
256 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 /* Is linked_proc_desc_table really necessary? It only seems to be used
275 by procedure call dummys. However, the procedures being called ought
276 to have their own proc_descs, and even if they don't,
277 heuristic_proc_desc knows how to create them! */
279 register struct linked_proc_info
*link
;
280 for (link
= linked_proc_desc_table
; link
; link
= link
->next
)
281 if (PROC_LOW_ADDR(&link
->info
) <= pc
282 && PROC_HIGH_ADDR(&link
->info
) > pc
)
285 heuristic_proc_desc(heuristic_proc_start(pc
), pc
, next_frame
);
290 mips_extra_func_info_t cached_proc_desc
;
293 mips_frame_chain(frame
)
296 mips_extra_func_info_t proc_desc
;
297 CORE_ADDR saved_pc
= FRAME_SAVED_PC(frame
);
299 if (saved_pc
== 0 || inside_entry_file (saved_pc
))
302 proc_desc
= find_proc_desc(saved_pc
, frame
);
306 cached_proc_desc
= proc_desc
;
307 return read_next_frame_reg(frame
, PROC_FRAME_REG(proc_desc
))
308 + PROC_FRAME_OFFSET(proc_desc
);
312 init_extra_frame_info(fci
)
313 struct frame_info
*fci
;
315 extern struct obstack frame_cache_obstack
;
316 /* Use proc_desc calculated in frame_chain */
317 mips_extra_func_info_t proc_desc
= fci
->next
? cached_proc_desc
:
318 find_proc_desc(fci
->pc
, fci
->next
);
320 fci
->saved_regs
= (struct frame_saved_regs
*)
321 obstack_alloc (&frame_cache_obstack
, sizeof(struct frame_saved_regs
));
322 bzero(fci
->saved_regs
, sizeof(struct frame_saved_regs
));
324 proc_desc
== &temp_proc_desc
? 0 : proc_desc
;
328 CORE_ADDR reg_position
;
330 /* r0 bit means kernel trap */
331 int kernel_trap
= PROC_REG_MASK(proc_desc
) & 1;
333 /* Fixup frame-pointer - only needed for top frame */
334 /* This may not be quite right, if proc has a real frame register */
335 if (fci
->pc
== PROC_LOW_ADDR(proc_desc
))
336 fci
->frame
= read_register (SP_REGNUM
);
338 fci
->frame
= READ_FRAME_REG(fci
, PROC_FRAME_REG(proc_desc
))
339 + PROC_FRAME_OFFSET(proc_desc
);
341 if (proc_desc
== &temp_proc_desc
)
342 *fci
->saved_regs
= temp_saved_regs
;
345 /* find which general-purpose registers were saved */
346 reg_position
= fci
->frame
+ PROC_REG_OFFSET(proc_desc
);
347 mask
= kernel_trap
? 0xFFFFFFFF : PROC_REG_MASK(proc_desc
);
348 for (ireg
= 31; mask
; --ireg
, mask
<<= 1)
349 if (mask
& 0x80000000)
351 fci
->saved_regs
->regs
[ireg
] = reg_position
;
354 /* find which floating-point registers were saved */
355 reg_position
= fci
->frame
+ PROC_FREG_OFFSET(proc_desc
);
356 /* The freg_offset points to where the first *double* register is saved.
357 * So skip to the high-order word. */
359 mask
= kernel_trap
? 0xFFFFFFFF : PROC_FREG_MASK(proc_desc
);
360 for (ireg
= 31; mask
; --ireg
, mask
<<= 1)
361 if (mask
& 0x80000000)
363 fci
->saved_regs
->regs
[FP0_REGNUM
+ireg
] = reg_position
;
368 /* hack: if argument regs are saved, guess these contain args */
369 if ((PROC_REG_MASK(proc_desc
) & 0xF0) == 0) fci
->num_args
= -1;
370 else if ((PROC_REG_MASK(proc_desc
) & 0x80) == 0) fci
->num_args
= 4;
371 else if ((PROC_REG_MASK(proc_desc
) & 0x40) == 0) fci
->num_args
= 3;
372 else if ((PROC_REG_MASK(proc_desc
) & 0x20) == 0) fci
->num_args
= 2;
373 else if ((PROC_REG_MASK(proc_desc
) & 0x10) == 0) fci
->num_args
= 1;
375 fci
->saved_regs
->regs
[PC_REGNUM
] = fci
->saved_regs
->regs
[RA_REGNUM
];
379 /* MIPS stack frames are almost impenetrable. When execution stops,
380 we basically have to look at symbol information for the function
381 that we stopped in, which tells us *which* register (if any) is
382 the base of the frame pointer, and what offset from that register
383 the frame itself is at.
385 This presents a problem when trying to examine a stack in memory
386 (that isn't executing at the moment), using the "frame" command. We
387 don't have a PC, nor do we have any registers except SP.
389 This routine takes two arguments, SP and PC, and tries to make the
390 cached frames look as if these two arguments defined a frame on the
391 cache. This allows the rest of info frame to extract the important
392 arguments without difficulty. */
395 setup_arbitrary_frame (argc
, argv
)
400 error ("MIPS frame specifications require two arguments: sp and pc");
402 return create_new_frame (argv
[0], argv
[1]);
407 mips_push_arguments(nargs
, args
, sp
, struct_return
, struct_addr
)
412 CORE_ADDR struct_addr
;
416 int accumulate_size
= struct_return
? 4 : 0;
417 struct mips_arg
{ char *contents
; int len
; int offset
; };
418 struct mips_arg
*mips_args
=
419 (struct mips_arg
*)alloca(nargs
* sizeof(struct mips_arg
));
420 register struct mips_arg
*m_arg
;
421 for (i
= 0, m_arg
= mips_args
; i
< nargs
; i
++, m_arg
++) {
422 extern value
value_arg_coerce();
423 value arg
= value_arg_coerce (args
[i
]);
424 m_arg
->len
= TYPE_LENGTH (VALUE_TYPE (arg
));
425 /* This entire mips-specific routine is because doubles must be aligned
426 * on 8-byte boundaries. It still isn't quite right, because MIPS decided
427 * to align 'struct {int a, b}' on 4-byte boundaries (even though this
428 * breaks their varargs implementation...). A correct solution
429 * requires an simulation of gcc's 'alignof' (and use of 'alignof'
430 * in stdarg.h/varargs.h).
432 if (m_arg
->len
> 4) accumulate_size
= (accumulate_size
+ 7) & -8;
433 m_arg
->offset
= accumulate_size
;
434 accumulate_size
= (accumulate_size
+ m_arg
->len
+ 3) & -4;
435 m_arg
->contents
= VALUE_CONTENTS(arg
);
437 accumulate_size
= (accumulate_size
+ 7) & (-8);
438 if (accumulate_size
< 16) accumulate_size
= 16;
439 sp
-= accumulate_size
;
440 for (i
= nargs
; m_arg
--, --i
>= 0; )
441 write_memory(sp
+ m_arg
->offset
, m_arg
->contents
, m_arg
->len
);
444 write_memory(sp
, (char *)&buf
, sizeof(CORE_ADDR
));
449 /* MASK(i,j) == (1<<i) + (1<<(i+1)) + ... + (1<<j)). Assume i<=j<31. */
450 #define MASK(i,j) ((1 << (j)+1)-1 ^ (1 << (i))-1)
453 mips_push_dummy_frame()
456 struct linked_proc_info
*link
= (struct linked_proc_info
*)
457 xmalloc(sizeof(struct linked_proc_info
));
458 mips_extra_func_info_t proc_desc
= &link
->info
;
459 CORE_ADDR sp
= read_register (SP_REGNUM
);
460 CORE_ADDR save_address
;
461 REGISTER_TYPE buffer
;
462 link
->next
= linked_proc_desc_table
;
463 linked_proc_desc_table
= link
;
464 #define PUSH_FP_REGNUM 16 /* must be a register preserved across calls */
465 #define GEN_REG_SAVE_MASK MASK(1,16)|MASK(24,28)|(1<<31)
466 #define GEN_REG_SAVE_COUNT 22
467 #define FLOAT_REG_SAVE_MASK MASK(0,19)
468 #define FLOAT_REG_SAVE_COUNT 20
469 #define SPECIAL_REG_SAVE_COUNT 4
471 * The registers we must save are all those not preserved across
472 * procedure calls. Dest_Reg (see tm-mips.h) must also be saved.
473 * In addition, we must save the PC, and PUSH_FP_REGNUM.
474 * (Ideally, we should also save MDLO/-HI and FP Control/Status reg.)
476 * Dummy frame layout:
479 * Saved MMHI, MMLO, FPC_CSR
484 * Saved D18 (i.e. F19, F18)
486 * Saved D0 (i.e. F1, F0)
487 * CALL_DUMMY (subroutine stub; see tm-mips.h)
488 * Parameter build area (not yet implemented)
491 PROC_REG_MASK(proc_desc
) = GEN_REG_SAVE_MASK
;
492 PROC_FREG_MASK(proc_desc
) = mips_fpu
? FLOAT_REG_SAVE_MASK
: 0;
493 PROC_REG_OFFSET(proc_desc
) = /* offset of (Saved R31) from FP */
494 -sizeof(long) - 4 * SPECIAL_REG_SAVE_COUNT
;
495 PROC_FREG_OFFSET(proc_desc
) = /* offset of (Saved D18) from FP */
496 -sizeof(double) - 4 * (SPECIAL_REG_SAVE_COUNT
+ GEN_REG_SAVE_COUNT
);
497 /* save general registers */
498 save_address
= sp
+ PROC_REG_OFFSET(proc_desc
);
499 for (ireg
= 32; --ireg
>= 0; )
500 if (PROC_REG_MASK(proc_desc
) & (1 << ireg
))
502 buffer
= read_register (ireg
);
503 write_memory (save_address
, (char *)&buffer
, sizeof(REGISTER_TYPE
));
506 /* save floating-points registers starting with high order word */
507 save_address
= sp
+ PROC_FREG_OFFSET(proc_desc
) + 4;
508 for (ireg
= 32; --ireg
>= 0; )
509 if (PROC_FREG_MASK(proc_desc
) & (1 << ireg
))
511 buffer
= read_register (ireg
+ FP0_REGNUM
);
512 write_memory (save_address
, (char *)&buffer
, 4);
515 write_register (PUSH_FP_REGNUM
, sp
);
516 PROC_FRAME_REG(proc_desc
) = PUSH_FP_REGNUM
;
517 PROC_FRAME_OFFSET(proc_desc
) = 0;
518 buffer
= read_register (PC_REGNUM
);
519 write_memory (sp
- 4, (char *)&buffer
, sizeof(REGISTER_TYPE
));
520 buffer
= read_register (HI_REGNUM
);
521 write_memory (sp
- 8, (char *)&buffer
, sizeof(REGISTER_TYPE
));
522 buffer
= read_register (LO_REGNUM
);
523 write_memory (sp
- 12, (char *)&buffer
, sizeof(REGISTER_TYPE
));
524 buffer
= read_register (mips_fpu
? FCRCS_REGNUM
: ZERO_REGNUM
);
525 write_memory (sp
- 16, (char *)&buffer
, sizeof(REGISTER_TYPE
));
526 sp
-= 4 * (GEN_REG_SAVE_COUNT
527 + (mips_fpu
? FLOAT_REG_SAVE_COUNT
: 0)
528 + SPECIAL_REG_SAVE_COUNT
);
529 write_register (SP_REGNUM
, sp
);
530 PROC_LOW_ADDR(proc_desc
) = sp
- CALL_DUMMY_SIZE
+ CALL_DUMMY_START_OFFSET
;
531 PROC_HIGH_ADDR(proc_desc
) = sp
;
532 SET_PROC_DESC_IS_DUMMY(proc_desc
);
533 PROC_PC_REG(proc_desc
) = RA_REGNUM
;
540 FRAME frame
= get_current_frame ();
541 CORE_ADDR new_sp
= frame
->frame
;
543 mips_extra_func_info_t proc_desc
= frame
->proc_desc
;
545 write_register (PC_REGNUM
, FRAME_SAVED_PC(frame
));
548 for (regnum
= 32; --regnum
>= 0; )
549 if (PROC_REG_MASK(proc_desc
) & (1 << regnum
))
550 write_register (regnum
,
551 read_memory_integer (frame
->saved_regs
->regs
[regnum
],
553 for (regnum
= 32; --regnum
>= 0; )
554 if (PROC_FREG_MASK(proc_desc
) & (1 << regnum
))
555 write_register (regnum
+ FP0_REGNUM
,
556 read_memory_integer (frame
->saved_regs
->regs
[regnum
+ FP0_REGNUM
], 4));
558 write_register (SP_REGNUM
, new_sp
);
559 flush_cached_frames ();
560 /* We let mips_init_extra_frame_info figure out the frame pointer */
561 set_current_frame (create_new_frame (0, read_pc ()));
563 if (PROC_DESC_IS_DUMMY(proc_desc
))
565 struct linked_proc_info
*pi_ptr
, *prev_ptr
;
567 for (pi_ptr
= linked_proc_desc_table
, prev_ptr
= NULL
;
569 prev_ptr
= pi_ptr
, pi_ptr
= pi_ptr
->next
)
571 if (&pi_ptr
->info
== proc_desc
)
576 error ("Can't locate dummy extra frame info\n");
578 if (prev_ptr
!= NULL
)
579 prev_ptr
->next
= pi_ptr
->next
;
581 linked_proc_desc_table
= pi_ptr
->next
;
585 write_register (HI_REGNUM
, read_memory_integer(new_sp
- 8, 4));
586 write_register (LO_REGNUM
, read_memory_integer(new_sp
- 12, 4));
588 write_register (FCRCS_REGNUM
, read_memory_integer(new_sp
- 16, 4));
593 mips_print_register (regnum
, all
)
596 unsigned char raw_buffer
[MAX_REGISTER_RAW_SIZE
* 2]; /* *2 for doubles */
599 /* Get the data in raw format. */
600 if (read_relative_register_raw_bytes (regnum
, raw_buffer
))
602 printf_filtered ("%s: [Invalid]", reg_names
[regnum
]);
606 /* If an even floating pointer register, also print as double. */
607 if (regnum
>= FP0_REGNUM
&& regnum
< FP0_REGNUM
+32
608 && !((regnum
-FP0_REGNUM
) & 1)) {
609 read_relative_register_raw_bytes (regnum
+1, raw_buffer
+4);
610 printf_filtered ("(d%d: ", regnum
-FP0_REGNUM
);
611 val_print (builtin_type_double
, raw_buffer
, 0,
612 stdout
, 0, 1, 0, Val_pretty_default
);
613 printf_filtered ("); ");
615 fputs_filtered (reg_names
[regnum
], stdout
);
616 #ifndef NUMERIC_REG_NAMES
618 printf_filtered ("(r%d): ", regnum
);
621 printf_filtered (": ");
623 /* If virtual format is floating, print it that way. */
624 if (TYPE_CODE (REGISTER_VIRTUAL_TYPE (regnum
)) == TYPE_CODE_FLT
625 && ! INVALID_FLOAT (raw_buffer
, REGISTER_VIRTUAL_SIZE(regnum
))) {
626 val_print (REGISTER_VIRTUAL_TYPE (regnum
), raw_buffer
, 0,
627 stdout
, 0, 1, 0, Val_pretty_default
);
629 /* Else print as integer in hex. */
634 bcopy (raw_buffer
, &val
, sizeof (long));
635 SWAP_TARGET_AND_HOST ((char *)&val
, sizeof (long));
637 printf_filtered ("0");
639 printf_filtered (local_hex_format(), val
);
641 printf_filtered ("%s=%d", local_hex_string(val
), val
);
645 /* Replacement for generic do_registers_info. */
647 mips_do_registers_info (regnum
, fpregs
)
652 mips_print_register (regnum
, 0);
653 printf_filtered ("\n");
656 for (regnum
= 0; regnum
< NUM_REGS
; ) {
657 if ((!fpregs
) && regnum
>= FP0_REGNUM
&& regnum
<= FCRIR_REGNUM
) {
661 mips_print_register (regnum
, 1);
663 if ((regnum
& 3) == 0 || regnum
== NUM_REGS
)
664 printf_filtered (";\n");
666 printf_filtered ("; ");
670 /* Return number of args passed to a frame. described by FIP.
671 Can return -1, meaning no way to tell. */
674 mips_frame_num_args(fip
)
678 struct chain_info_t
*p
;
680 p
= mips_find_cached_frame(FRAME_FP(fip
));
682 return p
->the_info
.numargs
;
688 /* Bad floats: Returns 0 if P points to a valid IEEE floating point number,
689 1 if P points to a denormalized number or a NaN. LEN says whether this is
690 a single-precision or double-precision float */
691 #define SINGLE_EXP_BITS 8
692 #define DOUBLE_EXP_BITS 11
701 exponent
= exponent
<< 1 >> (32 - SINGLE_EXP_BITS
- 1);
702 return ((exponent
== -1) || (! exponent
&& *p
));
706 #if TARGET_BYTE_ORDER == BIG_ENDIAN
711 exponent
= exponent
<< 1 >> (32 - DOUBLE_EXP_BITS
- 1);
712 return ((exponent
== -1) || (! exponent
&& *p
* *(p
+1)));
717 /* To skip prologues, I use this predicate. Returns either PC
718 itself if the code at PC does not look like a function prologue;
719 otherwise returns an address that (if we're lucky) follows
723 mips_skip_prologue(pc
)
730 int seen_sp_adjust
= 0;
732 /* Skip the typical prologue instructions. These are the stack adjustment
733 instruction and the instructions that save registers on the stack
734 or in the gcc frame. */
735 for (offset
= 0; offset
< 100; offset
+= 4) {
736 inst
= read_memory_integer(pc
+ offset
, 4);
737 if ((inst
& 0xffff0000) == 0x27bd0000) /* addiu $sp,$sp,offset */
739 else if ((inst
& 0xFFE00000) == 0xAFA00000 && (inst
& 0x001F0000))
740 continue; /* sw reg,n($sp) */
742 else if ((inst
& 0xFFE00000) == 0xE7A00000) /* swc1 freg,n($sp) */
744 else if ((inst
& 0xF3E00000) == 0xA3C00000 && (inst
& 0x001F0000))
746 continue; /* reg != $zero */
747 else if (inst
== 0x03A0F021) /* move $s8,$sp */
754 /* FIXME schauer. The following code seems no longer necessary if we
755 always skip the typical prologue instructions. */
761 /* Well, it looks like a frameless. Let's make sure.
762 Note that we are not called on the current PC,
763 but on the function`s start PC, and I have definitely
764 seen optimized code that adjusts the SP quite later */
765 b
= block_for_pc(pc
);
768 f
= lookup_symbol(MIPS_EFI_SYMBOL_NAME
, b
, LABEL_NAMESPACE
, 0, NULL
);
770 /* Ideally, I would like to use the adjusted info
771 from mips_frame_info(), but for all practical
772 purposes it will not matter (and it would require
773 a different definition of SKIP_PROLOGUE())
775 Actually, it would not hurt to skip the storing
776 of arguments on the stack as well. */
777 if (((mips_extra_func_info_t
)SYMBOL_VALUE(f
))->pdr
.frameoffset
)
784 /* Let the user turn off floating point. */
787 _initialize_mips_tdep ()
790 (add_set_cmd ("mipsfpu", class_support
, var_boolean
,
792 "Set use of floating point coprocessor.\n\
793 Turn off to avoid using floating point instructions when calling functions\n\
794 or dealing with return values.", &setlist
),