1 /* Intel 386 target-dependent stuff.
2 Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
4 Free Software Foundation, Inc.
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., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
24 #include "gdb_string.h"
29 #include "floatformat.h"
33 #include "arch-utils.h"
36 /* i386_register_byte[i] is the offset into the register file of the
37 start of register number i. We initialize this from
38 i386_register_raw_size. */
39 int i386_register_byte
[MAX_NUM_REGS
];
41 /* i386_register_raw_size[i] is the number of bytes of storage in
42 GDB's register array occupied by register i. */
43 int i386_register_raw_size
[MAX_NUM_REGS
] = {
57 /* i386_register_virtual_size[i] is the size in bytes of the virtual
58 type of register i. */
59 int i386_register_virtual_size
[MAX_NUM_REGS
];
62 /* This is the variable that is set with "set disassembly-flavor", and
63 its legitimate values. */
64 static const char att_flavor
[] = "att";
65 static const char intel_flavor
[] = "intel";
66 static const char *valid_flavors
[] =
72 static const char *disassembly_flavor
= att_flavor
;
74 /* This is used to keep the bfd arch_info in sync with the disassembly
76 static void set_disassembly_flavor_sfunc (char *, int,
77 struct cmd_list_element
*);
78 static void set_disassembly_flavor (void);
81 /* Stdio style buffering was used to minimize calls to ptrace, but
82 this buffering did not take into account that the code section
83 being accessed may not be an even number of buffers long (even if
84 the buffer is only sizeof(int) long). In cases where the code
85 section size happened to be a non-integral number of buffers long,
86 attempting to read the last buffer would fail. Simply using
87 target_read_memory and ignoring errors, rather than read_memory, is
88 not the correct solution, since legitimate access errors would then
89 be totally ignored. To properly handle this situation and continue
90 to use buffering would require that this code be able to determine
91 the minimum code section size granularity (not the alignment of the
92 section itself, since the actual failing case that pointed out this
93 problem had a section alignment of 4 but was not a multiple of 4
94 bytes long), on a target by target basis, and then adjust it's
95 buffer size accordingly. This is messy, but potentially feasible.
96 It probably needs the bfd library's help and support. For now, the
97 buffer size is set to 1. (FIXME -fnf) */
99 #define CODESTREAM_BUFSIZ 1 /* Was sizeof(int), see note above. */
100 static CORE_ADDR codestream_next_addr
;
101 static CORE_ADDR codestream_addr
;
102 static unsigned char codestream_buf
[CODESTREAM_BUFSIZ
];
103 static int codestream_off
;
104 static int codestream_cnt
;
106 #define codestream_tell() (codestream_addr + codestream_off)
107 #define codestream_peek() \
108 (codestream_cnt == 0 ? \
109 codestream_fill(1) : codestream_buf[codestream_off])
110 #define codestream_get() \
111 (codestream_cnt-- == 0 ? \
112 codestream_fill(0) : codestream_buf[codestream_off++])
115 codestream_fill (int peek_flag
)
117 codestream_addr
= codestream_next_addr
;
118 codestream_next_addr
+= CODESTREAM_BUFSIZ
;
120 codestream_cnt
= CODESTREAM_BUFSIZ
;
121 read_memory (codestream_addr
, (char *) codestream_buf
, CODESTREAM_BUFSIZ
);
124 return (codestream_peek ());
126 return (codestream_get ());
130 codestream_seek (CORE_ADDR place
)
132 codestream_next_addr
= place
/ CODESTREAM_BUFSIZ
;
133 codestream_next_addr
*= CODESTREAM_BUFSIZ
;
136 while (codestream_tell () != place
)
141 codestream_read (unsigned char *buf
, int count
)
146 for (i
= 0; i
< count
; i
++)
147 *p
++ = codestream_get ();
151 /* If the next instruction is a jump, move to its target. */
154 i386_follow_jump (void)
156 unsigned char buf
[4];
162 pos
= codestream_tell ();
165 if (codestream_peek () == 0x66)
171 switch (codestream_get ())
174 /* Relative jump: if data16 == 0, disp32, else disp16. */
177 codestream_read (buf
, 2);
178 delta
= extract_signed_integer (buf
, 2);
180 /* Include the size of the jmp instruction (including the
186 codestream_read (buf
, 4);
187 delta
= extract_signed_integer (buf
, 4);
193 /* Relative jump, disp8 (ignore data16). */
194 codestream_read (buf
, 1);
195 /* Sign-extend it. */
196 delta
= extract_signed_integer (buf
, 1);
201 codestream_seek (pos
);
204 /* Find & return the amount a local space allocated, and advance the
205 codestream to the first register push (if any).
207 If the entry sequence doesn't make sense, return -1, and leave
208 codestream pointer at a random spot. */
211 i386_get_frame_setup (CORE_ADDR pc
)
215 codestream_seek (pc
);
219 op
= codestream_get ();
221 if (op
== 0x58) /* popl %eax */
223 /* This function must start with
226 xchgl %eax, (%esp) 0x87 0x04 0x24
227 or xchgl %eax, 0(%esp) 0x87 0x44 0x24 0x00
229 (the System V compiler puts out the second `xchg'
230 instruction, and the assembler doesn't try to optimize it, so
231 the 'sib' form gets generated). This sequence is used to get
232 the address of the return buffer for a function that returns
235 unsigned char buf
[4];
236 static unsigned char proto1
[3] = { 0x87, 0x04, 0x24 };
237 static unsigned char proto2
[4] = { 0x87, 0x44, 0x24, 0x00 };
239 pos
= codestream_tell ();
240 codestream_read (buf
, 4);
241 if (memcmp (buf
, proto1
, 3) == 0)
243 else if (memcmp (buf
, proto2
, 4) == 0)
246 codestream_seek (pos
);
247 op
= codestream_get (); /* Update next opcode. */
250 if (op
== 0x68 || op
== 0x6a)
252 /* This function may start with
264 unsigned char buf
[8];
266 /* Skip past the `pushl' instruction; it has either a one-byte
267 or a four-byte operand, depending on the opcode. */
268 pos
= codestream_tell ();
273 codestream_seek (pos
);
275 /* Read the following 8 bytes, which should be "call _probe" (6
276 bytes) followed by "addl $4,%esp" (2 bytes). */
277 codestream_read (buf
, sizeof (buf
));
278 if (buf
[0] == 0xe8 && buf
[6] == 0xc4 && buf
[7] == 0x4)
280 codestream_seek (pos
);
281 op
= codestream_get (); /* Update next opcode. */
284 if (op
== 0x55) /* pushl %ebp */
286 /* Check for "movl %esp, %ebp" -- can be written in two ways. */
287 switch (codestream_get ())
290 if (codestream_get () != 0xec)
294 if (codestream_get () != 0xe5)
300 /* Check for stack adjustment
304 NOTE: You can't subtract a 16 bit immediate from a 32 bit
305 reg, so we don't have to worry about a data16 prefix. */
306 op
= codestream_peek ();
309 /* `subl' with 8 bit immediate. */
311 if (codestream_get () != 0xec)
312 /* Some instruction starting with 0x83 other than `subl'. */
314 codestream_seek (codestream_tell () - 2);
317 /* `subl' with signed byte immediate (though it wouldn't
318 make sense to be negative). */
319 return (codestream_get ());
324 /* Maybe it is `subl' with a 32 bit immedediate. */
326 if (codestream_get () != 0xec)
327 /* Some instruction starting with 0x81 other than `subl'. */
329 codestream_seek (codestream_tell () - 2);
332 /* It is `subl' with a 32 bit immediate. */
333 codestream_read ((unsigned char *) buf
, 4);
334 return extract_signed_integer (buf
, 4);
344 /* `enter' with 16 bit unsigned immediate. */
345 codestream_read ((unsigned char *) buf
, 2);
346 codestream_get (); /* Flush final byte of enter instruction. */
347 return extract_unsigned_integer (buf
, 2);
352 /* Return the chain-pointer for FRAME. In the case of the i386, the
353 frame's nominal address is the address of a 4-byte word containing
354 the calling frame's address. */
357 i386_frame_chain (struct frame_info
*frame
)
359 if (frame
->signal_handler_caller
)
362 if (! inside_entry_file (frame
->pc
))
363 return read_memory_unsigned_integer (frame
->frame
, 4);
368 /* Determine whether the function invocation represented by FRAME does
369 not have a from on the stack associated with it. If it does not,
370 return non-zero, otherwise return zero. */
373 i386_frameless_function_invocation (struct frame_info
*frame
)
375 if (frame
->signal_handler_caller
)
378 return frameless_look_for_prologue (frame
);
381 /* Immediately after a function call, return the saved pc. */
384 i386_saved_pc_after_call (struct frame_info
*frame
)
386 return read_memory_unsigned_integer (read_register (SP_REGNUM
), 4);
389 /* Return number of args passed to a frame.
390 Can return -1, meaning no way to tell. */
393 i386_frame_num_args (struct frame_info
*fi
)
398 /* This loses because not only might the compiler not be popping the
399 args right after the function call, it might be popping args from
400 both this call and a previous one, and we would say there are
401 more args than there really are. */
405 struct frame_info
*pfi
;
407 /* On the i386, the instruction following the call could be:
409 addl $imm, %esp - imm/4 args; imm may be 8 or 32 bits
410 anything else - zero args. */
414 frameless
= FRAMELESS_FUNCTION_INVOCATION (fi
);
416 /* In the absence of a frame pointer, GDB doesn't get correct
417 values for nameless arguments. Return -1, so it doesn't print
418 any nameless arguments. */
421 pfi
= get_prev_frame (fi
);
424 /* NOTE: This can happen if we are looking at the frame for
425 main, because FRAME_CHAIN_VALID won't let us go into start.
426 If we have debugging symbols, that's not really a big deal;
427 it just means it will only show as many arguments to main as
434 op
= read_memory_integer (retpc
, 1);
435 if (op
== 0x59) /* pop %ecx */
439 op
= read_memory_integer (retpc
+ 1, 1);
441 /* addl $<signed imm 8 bits>, %esp */
442 return (read_memory_integer (retpc
+ 2, 1) & 0xff) / 4;
446 else if (op
== 0x81) /* `add' with 32 bit immediate. */
448 op
= read_memory_integer (retpc
+ 1, 1);
450 /* addl $<imm 32>, %esp */
451 return read_memory_integer (retpc
+ 2, 4) / 4;
463 /* Parse the first few instructions the function to see what registers
466 We handle these cases:
468 The startup sequence can be at the start of the function, or the
469 function can start with a branch to startup code at the end.
471 %ebp can be set up with either the 'enter' instruction, or "pushl
472 %ebp, movl %esp, %ebp" (`enter' is too slow to be useful, but was
473 once used in the System V compiler).
475 Local space is allocated just below the saved %ebp by either the
476 'enter' instruction, or by "subl $<size>, %esp". 'enter' has a 16
477 bit unsigned argument for space to allocate, and the 'addl'
478 instruction could have either a signed byte, or 32 bit immediate.
480 Next, the registers used by this function are pushed. With the
481 System V compiler they will always be in the order: %edi, %esi,
482 %ebx (and sometimes a harmless bug causes it to also save but not
483 restore %eax); however, the code below is willing to see the pushes
484 in any order, and will handle up to 8 of them.
486 If the setup sequence is at the end of the function, then the next
487 instruction will be a branch back to the start. */
490 i386_frame_init_saved_regs (struct frame_info
*fip
)
494 CORE_ADDR dummy_bottom
;
502 frame_saved_regs_zalloc (fip
);
504 /* If the frame is the end of a dummy, compute where the beginning
506 dummy_bottom
= fip
->frame
- 4 - REGISTER_BYTES
- CALL_DUMMY_LENGTH
;
508 /* Check if the PC points in the stack, in a dummy frame. */
509 if (dummy_bottom
<= fip
->pc
&& fip
->pc
<= fip
->frame
)
511 /* All registers were saved by push_call_dummy. */
513 for (i
= 0; i
< NUM_REGS
; i
++)
515 addr
-= REGISTER_RAW_SIZE (i
);
516 fip
->saved_regs
[i
] = addr
;
521 pc
= get_pc_function_start (fip
->pc
);
523 locals
= i386_get_frame_setup (pc
);
527 addr
= fip
->frame
- 4 - locals
;
528 for (i
= 0; i
< 8; i
++)
530 op
= codestream_get ();
531 if (op
< 0x50 || op
> 0x57)
533 #ifdef I386_REGNO_TO_SYMMETRY
534 /* Dynix uses different internal numbering. Ick. */
535 fip
->saved_regs
[I386_REGNO_TO_SYMMETRY (op
- 0x50)] = addr
;
537 fip
->saved_regs
[op
- 0x50] = addr
;
543 fip
->saved_regs
[PC_REGNUM
] = fip
->frame
+ 4;
544 fip
->saved_regs
[FP_REGNUM
] = fip
->frame
;
547 /* Return PC of first real instruction. */
550 i386_skip_prologue (int pc
)
554 static unsigned char pic_pat
[6] =
555 { 0xe8, 0, 0, 0, 0, /* call 0x0 */
556 0x5b, /* popl %ebx */
560 if (i386_get_frame_setup (pc
) < 0)
563 /* Found valid frame setup -- codestream now points to start of push
564 instructions for saving registers. */
566 /* Skip over register saves. */
567 for (i
= 0; i
< 8; i
++)
569 op
= codestream_peek ();
570 /* Break if not `pushl' instrunction. */
571 if (op
< 0x50 || op
> 0x57)
576 /* The native cc on SVR4 in -K PIC mode inserts the following code
577 to get the address of the global offset table (GOT) into register
582 movl %ebx,x(%ebp) (optional)
585 This code is with the rest of the prologue (at the end of the
586 function), so we have to skip it to get to the first real
587 instruction at the start of the function. */
589 pos
= codestream_tell ();
590 for (i
= 0; i
< 6; i
++)
592 op
= codestream_get ();
593 if (pic_pat
[i
] != op
)
598 unsigned char buf
[4];
601 op
= codestream_get ();
602 if (op
== 0x89) /* movl %ebx, x(%ebp) */
604 op
= codestream_get ();
605 if (op
== 0x5d) /* One byte offset from %ebp. */
608 codestream_read (buf
, 1);
610 else if (op
== 0x9d) /* Four byte offset from %ebp. */
613 codestream_read (buf
, 4);
615 else /* Unexpected instruction. */
617 op
= codestream_get ();
620 if (delta
> 0 && op
== 0x81 && codestream_get () == 0xc3)
625 codestream_seek (pos
);
629 return (codestream_tell ());
633 i386_push_dummy_frame (void)
635 CORE_ADDR sp
= read_register (SP_REGNUM
);
637 char regbuf
[MAX_REGISTER_RAW_SIZE
];
639 sp
= push_word (sp
, read_register (PC_REGNUM
));
640 sp
= push_word (sp
, read_register (FP_REGNUM
));
641 write_register (FP_REGNUM
, sp
);
642 for (regnum
= 0; regnum
< NUM_REGS
; regnum
++)
644 read_register_gen (regnum
, regbuf
);
645 sp
= push_bytes (sp
, regbuf
, REGISTER_RAW_SIZE (regnum
));
647 write_register (SP_REGNUM
, sp
);
650 /* Insert the (relative) function address into the call sequence
654 i386_fix_call_dummy (char *dummy
, CORE_ADDR pc
, CORE_ADDR fun
, int nargs
,
655 value_ptr
*args
, struct type
*type
, int gcc_p
)
657 int from
, to
, delta
, loc
;
659 loc
= (int)(read_register (SP_REGNUM
) - CALL_DUMMY_LENGTH
);
664 *((char *)(dummy
) + 1) = (delta
& 0xff);
665 *((char *)(dummy
) + 2) = ((delta
>> 8) & 0xff);
666 *((char *)(dummy
) + 3) = ((delta
>> 16) & 0xff);
667 *((char *)(dummy
) + 4) = ((delta
>> 24) & 0xff);
671 i386_pop_frame (void)
673 struct frame_info
*frame
= get_current_frame ();
676 char regbuf
[MAX_REGISTER_RAW_SIZE
];
678 fp
= FRAME_FP (frame
);
679 i386_frame_init_saved_regs (frame
);
681 for (regnum
= 0; regnum
< NUM_REGS
; regnum
++)
684 addr
= frame
->saved_regs
[regnum
];
687 read_memory (addr
, regbuf
, REGISTER_RAW_SIZE (regnum
));
688 write_register_bytes (REGISTER_BYTE (regnum
), regbuf
,
689 REGISTER_RAW_SIZE (regnum
));
692 write_register (FP_REGNUM
, read_memory_integer (fp
, 4));
693 write_register (PC_REGNUM
, read_memory_integer (fp
+ 4, 4));
694 write_register (SP_REGNUM
, fp
+ 8);
695 flush_cached_frames ();
699 #ifdef GET_LONGJMP_TARGET
701 /* Figure out where the longjmp will land. Slurp the args out of the
702 stack. We expect the first arg to be a pointer to the jmp_buf
703 structure from which we extract the pc (JB_PC) that we will land
704 at. The pc is copied into PC. This routine returns true on
708 get_longjmp_target (CORE_ADDR
*pc
)
710 char buf
[TARGET_PTR_BIT
/ TARGET_CHAR_BIT
];
711 CORE_ADDR sp
, jb_addr
;
713 sp
= read_register (SP_REGNUM
);
715 if (target_read_memory (sp
+ SP_ARG0
, /* Offset of first arg on stack. */
717 TARGET_PTR_BIT
/ TARGET_CHAR_BIT
))
720 jb_addr
= extract_address (buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
722 if (target_read_memory (jb_addr
+ JB_PC
* JB_ELEMENT_SIZE
, buf
,
723 TARGET_PTR_BIT
/ TARGET_CHAR_BIT
))
726 *pc
= extract_address (buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
731 #endif /* GET_LONGJMP_TARGET */
735 i386_push_arguments (int nargs
, value_ptr
*args
, CORE_ADDR sp
,
736 int struct_return
, CORE_ADDR struct_addr
)
738 sp
= default_push_arguments (nargs
, args
, sp
, struct_return
, struct_addr
);
745 store_address (buf
, 4, struct_addr
);
746 write_memory (sp
, buf
, 4);
753 i386_store_struct_return (CORE_ADDR addr
, CORE_ADDR sp
)
755 /* Do nothing. Everything was already done by i386_push_arguments. */
758 /* These registers are used for returning integers (and on some
759 targets also for returning `struct' and `union' values when their
760 size and alignment match an integer type). */
761 #define LOW_RETURN_REGNUM 0 /* %eax */
762 #define HIGH_RETURN_REGNUM 2 /* %edx */
764 /* Extract from an array REGBUF containing the (raw) register state, a
765 function return value of TYPE, and copy that, in virtual format,
769 i386_extract_return_value (struct type
*type
, char *regbuf
, char *valbuf
)
771 int len
= TYPE_LENGTH (type
);
773 if (TYPE_CODE (type
) == TYPE_CODE_STRUCT
774 && TYPE_NFIELDS (type
) == 1)
776 i386_extract_return_value (TYPE_FIELD_TYPE (type
, 0), regbuf
, valbuf
);
780 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
784 warning ("Cannot find floating-point return value.");
785 memset (valbuf
, 0, len
);
789 /* Floating-point return values can be found in %st(0). */
790 if (len
== TARGET_LONG_DOUBLE_BIT
/ TARGET_CHAR_BIT
791 && TARGET_LONG_DOUBLE_FORMAT
== &floatformat_i387_ext
)
793 /* Copy straight over, but take care of the padding. */
794 memcpy (valbuf
, ®buf
[REGISTER_BYTE (FP0_REGNUM
)],
796 memset (valbuf
+ FPU_REG_RAW_SIZE
, 0, len
- FPU_REG_RAW_SIZE
);
800 /* Convert the extended floating-point number found in
801 %st(0) to the desired type. This is probably not exactly
802 how it would happen on the target itself, but it is the
805 floatformat_to_doublest (&floatformat_i387_ext
,
806 ®buf
[REGISTER_BYTE (FP0_REGNUM
)], &val
);
807 store_floating (valbuf
, TYPE_LENGTH (type
), val
);
812 int low_size
= REGISTER_RAW_SIZE (LOW_RETURN_REGNUM
);
813 int high_size
= REGISTER_RAW_SIZE (HIGH_RETURN_REGNUM
);
816 memcpy (valbuf
, ®buf
[REGISTER_BYTE (LOW_RETURN_REGNUM
)], len
);
817 else if (len
<= (low_size
+ high_size
))
820 ®buf
[REGISTER_BYTE (LOW_RETURN_REGNUM
)], low_size
);
821 memcpy (valbuf
+ low_size
,
822 ®buf
[REGISTER_BYTE (HIGH_RETURN_REGNUM
)], len
- low_size
);
825 internal_error (__FILE__
, __LINE__
,
826 "Cannot extract return value of %d bytes long.", len
);
830 /* Write into the appropriate registers a function return value stored
831 in VALBUF of type TYPE, given in virtual format. */
834 i386_store_return_value (struct type
*type
, char *valbuf
)
836 int len
= TYPE_LENGTH (type
);
838 if (TYPE_CODE (type
) == TYPE_CODE_STRUCT
839 && TYPE_NFIELDS (type
) == 1)
841 i386_store_return_value (TYPE_FIELD_TYPE (type
, 0), valbuf
);
845 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
849 warning ("Cannot set floating-point return value.");
853 /* Floating-point return values can be found in %st(0). */
854 if (len
== TARGET_LONG_DOUBLE_BIT
/ TARGET_CHAR_BIT
855 && TARGET_LONG_DOUBLE_FORMAT
== &floatformat_i387_ext
)
857 /* Copy straight over. */
858 write_register_bytes (REGISTER_BYTE (FP0_REGNUM
), valbuf
,
863 char buf
[FPU_REG_RAW_SIZE
];
866 /* Convert the value found in VALBUF to the extended
867 floating point format used by the FPU. This is probably
868 not exactly how it would happen on the target itself, but
869 it is the best we can do. */
870 val
= extract_floating (valbuf
, TYPE_LENGTH (type
));
871 floatformat_from_doublest (&floatformat_i387_ext
, &val
, buf
);
872 write_register_bytes (REGISTER_BYTE (FP0_REGNUM
), buf
,
878 int low_size
= REGISTER_RAW_SIZE (LOW_RETURN_REGNUM
);
879 int high_size
= REGISTER_RAW_SIZE (HIGH_RETURN_REGNUM
);
882 write_register_bytes (REGISTER_BYTE (LOW_RETURN_REGNUM
), valbuf
, len
);
883 else if (len
<= (low_size
+ high_size
))
885 write_register_bytes (REGISTER_BYTE (LOW_RETURN_REGNUM
),
887 write_register_bytes (REGISTER_BYTE (HIGH_RETURN_REGNUM
),
888 valbuf
+ low_size
, len
- low_size
);
891 internal_error (__FILE__
, __LINE__
,
892 "Cannot store return value of %d bytes long.", len
);
896 /* Extract from an array REGBUF containing the (raw) register state
897 the address in which a function should return its structure value,
901 i386_extract_struct_value_address (char *regbuf
)
903 return extract_address (®buf
[REGISTER_BYTE (LOW_RETURN_REGNUM
)],
904 REGISTER_RAW_SIZE (LOW_RETURN_REGNUM
));
908 /* Return the GDB type object for the "standard" data type of data in
909 register REGNUM. Perhaps %esi and %edi should go here, but
910 potentially they could be used for things other than address. */
913 i386_register_virtual_type (int regnum
)
915 if (regnum
== PC_REGNUM
|| regnum
== FP_REGNUM
|| regnum
== SP_REGNUM
)
916 return lookup_pointer_type (builtin_type_void
);
918 if (IS_FP_REGNUM (regnum
))
919 return builtin_type_long_double
;
921 if (IS_SSE_REGNUM (regnum
))
922 return builtin_type_v4sf
;
924 return builtin_type_int
;
927 /* Return true iff register REGNUM's virtual format is different from
928 its raw format. Note that this definition assumes that the host
929 supports IEEE 32-bit floats, since it doesn't say that SSE
930 registers need conversion. Even if we can't find a counterexample,
931 this is still sloppy. */
934 i386_register_convertible (int regnum
)
936 return IS_FP_REGNUM (regnum
);
939 /* Convert data from raw format for register REGNUM in buffer FROM to
940 virtual format with type TYPE in buffer TO. In principle both
941 formats are identical except that the virtual format has two extra
942 bytes appended that aren't used. We set these to zero. */
945 i386_register_convert_to_virtual (int regnum
, struct type
*type
,
946 char *from
, char *to
)
948 /* Copy straight over, but take care of the padding. */
949 memcpy (to
, from
, FPU_REG_RAW_SIZE
);
950 memset (to
+ FPU_REG_RAW_SIZE
, 0, TYPE_LENGTH (type
) - FPU_REG_RAW_SIZE
);
953 /* Convert data from virtual format with type TYPE in buffer FROM to
954 raw format for register REGNUM in buffer TO. Simply omit the two
958 i386_register_convert_to_raw (struct type
*type
, int regnum
,
959 char *from
, char *to
)
961 memcpy (to
, from
, FPU_REG_RAW_SIZE
);
965 #ifdef I386V4_SIGTRAMP_SAVED_PC
966 /* Get saved user PC for sigtramp from the pushed ucontext on the
967 stack for all three variants of SVR4 sigtramps. */
970 i386v4_sigtramp_saved_pc (struct frame_info
*frame
)
972 CORE_ADDR saved_pc_offset
= 4;
975 find_pc_partial_function (frame
->pc
, &name
, NULL
, NULL
);
978 if (STREQ (name
, "_sigreturn"))
979 saved_pc_offset
= 132 + 14 * 4;
980 else if (STREQ (name
, "_sigacthandler"))
981 saved_pc_offset
= 80 + 14 * 4;
982 else if (STREQ (name
, "sigvechandler"))
983 saved_pc_offset
= 120 + 14 * 4;
987 return read_memory_integer (frame
->next
->frame
+ saved_pc_offset
, 4);
988 return read_memory_integer (read_register (SP_REGNUM
) + saved_pc_offset
, 4);
990 #endif /* I386V4_SIGTRAMP_SAVED_PC */
993 #ifdef STATIC_TRANSFORM_NAME
994 /* SunPRO encodes the static variables. This is not related to C++
995 mangling, it is done for C too. */
998 sunpro_static_transform_name (char *name
)
1001 if (IS_STATIC_TRANSFORM_NAME (name
))
1003 /* For file-local statics there will be a period, a bunch of
1004 junk (the contents of which match a string given in the
1005 N_OPT), a period and the name. For function-local statics
1006 there will be a bunch of junk (which seems to change the
1007 second character from 'A' to 'B'), a period, the name of the
1008 function, and the name. So just skip everything before the
1010 p
= strrchr (name
, '.');
1016 #endif /* STATIC_TRANSFORM_NAME */
1019 /* Stuff for WIN32 PE style DLL's but is pretty generic really. */
1022 skip_trampoline_code (CORE_ADDR pc
, char *name
)
1024 if (pc
&& read_memory_unsigned_integer (pc
, 2) == 0x25ff) /* jmp *(dest) */
1026 unsigned long indirect
= read_memory_unsigned_integer (pc
+ 2, 4);
1027 struct minimal_symbol
*indsym
=
1028 indirect
? lookup_minimal_symbol_by_pc (indirect
) : 0;
1029 char *symname
= indsym
? SYMBOL_NAME (indsym
) : 0;
1033 if (strncmp (symname
, "__imp_", 6) == 0
1034 || strncmp (symname
, "_imp_", 5) == 0)
1035 return name
? 1 : read_memory_unsigned_integer (indirect
, 4);
1038 return 0; /* Not a trampoline. */
1042 /* We have two flavours of disassembly. The machinery on this page
1043 deals with switching between those. */
1046 gdb_print_insn_i386 (bfd_vma memaddr
, disassemble_info
*info
)
1048 if (disassembly_flavor
== att_flavor
)
1049 return print_insn_i386_att (memaddr
, info
);
1050 else if (disassembly_flavor
== intel_flavor
)
1051 return print_insn_i386_intel (memaddr
, info
);
1052 /* Never reached -- disassembly_flavour is always either att_flavor
1054 internal_error (__FILE__
, __LINE__
, "failed internal consistency check");
1057 /* If the disassembly mode is intel, we have to also switch the bfd
1058 mach_type. This function is run in the set disassembly_flavor
1059 command, and does that. */
1062 set_disassembly_flavor_sfunc (char *args
, int from_tty
,
1063 struct cmd_list_element
*c
)
1065 set_disassembly_flavor ();
1069 set_disassembly_flavor (void)
1071 if (disassembly_flavor
== att_flavor
)
1072 set_architecture_from_arch_mach (bfd_arch_i386
, bfd_mach_i386_i386
);
1073 else if (disassembly_flavor
== intel_flavor
)
1074 set_architecture_from_arch_mach (bfd_arch_i386
,
1075 bfd_mach_i386_i386_intel_syntax
);
1079 /* Provide a prototype to silence -Wmissing-prototypes. */
1080 void _initialize_i386_tdep (void);
1083 _initialize_i386_tdep (void)
1085 /* Initialize the table saying where each register starts in the
1091 for (i
= 0; i
< MAX_NUM_REGS
; i
++)
1093 i386_register_byte
[i
] = offset
;
1094 offset
+= i386_register_raw_size
[i
];
1098 /* Initialize the table of virtual register sizes. */
1102 for (i
= 0; i
< MAX_NUM_REGS
; i
++)
1103 i386_register_virtual_size
[i
] = TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (i
));
1106 tm_print_insn
= gdb_print_insn_i386
;
1107 tm_print_insn_info
.mach
= bfd_lookup_arch (bfd_arch_i386
, 0)->mach
;
1109 /* Add the variable that controls the disassembly flavor. */
1111 struct cmd_list_element
*new_cmd
;
1113 new_cmd
= add_set_enum_cmd ("disassembly-flavor", no_class
,
1115 &disassembly_flavor
,
1117 Set the disassembly flavor, the valid values are \"att\" and \"intel\", \
1118 and the default value is \"att\".",
1120 new_cmd
->function
.sfunc
= set_disassembly_flavor_sfunc
;
1121 add_show_from_set (new_cmd
, &showlist
);
1124 /* Finally, initialize the disassembly flavor to the default given
1125 in the disassembly_flavor variable. */
1126 set_disassembly_flavor ();