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 /* Immediately after a function call, return the saved pc. */
371 i386_saved_pc_after_call (struct frame_info
*frame
)
373 return read_memory_unsigned_integer (read_register (SP_REGNUM
), 4);
376 /* Return number of args passed to a frame.
377 Can return -1, meaning no way to tell. */
380 i386_frame_num_args (struct frame_info
*fi
)
385 /* This loses because not only might the compiler not be popping the
386 args right after the function call, it might be popping args from
387 both this call and a previous one, and we would say there are
388 more args than there really are. */
392 struct frame_info
*pfi
;
394 /* On the i386, the instruction following the call could be:
396 addl $imm, %esp - imm/4 args; imm may be 8 or 32 bits
397 anything else - zero args. */
401 frameless
= FRAMELESS_FUNCTION_INVOCATION (fi
);
403 /* In the absence of a frame pointer, GDB doesn't get correct
404 values for nameless arguments. Return -1, so it doesn't print
405 any nameless arguments. */
408 pfi
= get_prev_frame (fi
);
411 /* NOTE: This can happen if we are looking at the frame for
412 main, because FRAME_CHAIN_VALID won't let us go into start.
413 If we have debugging symbols, that's not really a big deal;
414 it just means it will only show as many arguments to main as
421 op
= read_memory_integer (retpc
, 1);
422 if (op
== 0x59) /* pop %ecx */
426 op
= read_memory_integer (retpc
+ 1, 1);
428 /* addl $<signed imm 8 bits>, %esp */
429 return (read_memory_integer (retpc
+ 2, 1) & 0xff) / 4;
433 else if (op
== 0x81) /* `add' with 32 bit immediate. */
435 op
= read_memory_integer (retpc
+ 1, 1);
437 /* addl $<imm 32>, %esp */
438 return read_memory_integer (retpc
+ 2, 4) / 4;
450 /* Parse the first few instructions the function to see what registers
453 We handle these cases:
455 The startup sequence can be at the start of the function, or the
456 function can start with a branch to startup code at the end.
458 %ebp can be set up with either the 'enter' instruction, or "pushl
459 %ebp, movl %esp, %ebp" (`enter' is too slow to be useful, but was
460 once used in the System V compiler).
462 Local space is allocated just below the saved %ebp by either the
463 'enter' instruction, or by "subl $<size>, %esp". 'enter' has a 16
464 bit unsigned argument for space to allocate, and the 'addl'
465 instruction could have either a signed byte, or 32 bit immediate.
467 Next, the registers used by this function are pushed. With the
468 System V compiler they will always be in the order: %edi, %esi,
469 %ebx (and sometimes a harmless bug causes it to also save but not
470 restore %eax); however, the code below is willing to see the pushes
471 in any order, and will handle up to 8 of them.
473 If the setup sequence is at the end of the function, then the next
474 instruction will be a branch back to the start. */
477 i386_frame_init_saved_regs (struct frame_info
*fip
)
481 CORE_ADDR dummy_bottom
;
489 frame_saved_regs_zalloc (fip
);
491 /* If the frame is the end of a dummy, compute where the beginning
493 dummy_bottom
= fip
->frame
- 4 - REGISTER_BYTES
- CALL_DUMMY_LENGTH
;
495 /* Check if the PC points in the stack, in a dummy frame. */
496 if (dummy_bottom
<= fip
->pc
&& fip
->pc
<= fip
->frame
)
498 /* All registers were saved by push_call_dummy. */
500 for (i
= 0; i
< NUM_REGS
; i
++)
502 addr
-= REGISTER_RAW_SIZE (i
);
503 fip
->saved_regs
[i
] = addr
;
508 pc
= get_pc_function_start (fip
->pc
);
510 locals
= i386_get_frame_setup (pc
);
514 addr
= fip
->frame
- 4 - locals
;
515 for (i
= 0; i
< 8; i
++)
517 op
= codestream_get ();
518 if (op
< 0x50 || op
> 0x57)
520 #ifdef I386_REGNO_TO_SYMMETRY
521 /* Dynix uses different internal numbering. Ick. */
522 fip
->saved_regs
[I386_REGNO_TO_SYMMETRY (op
- 0x50)] = addr
;
524 fip
->saved_regs
[op
- 0x50] = addr
;
530 fip
->saved_regs
[PC_REGNUM
] = fip
->frame
+ 4;
531 fip
->saved_regs
[FP_REGNUM
] = fip
->frame
;
534 /* Return PC of first real instruction. */
537 i386_skip_prologue (int pc
)
541 static unsigned char pic_pat
[6] =
542 { 0xe8, 0, 0, 0, 0, /* call 0x0 */
543 0x5b, /* popl %ebx */
547 if (i386_get_frame_setup (pc
) < 0)
550 /* Found valid frame setup -- codestream now points to start of push
551 instructions for saving registers. */
553 /* Skip over register saves. */
554 for (i
= 0; i
< 8; i
++)
556 op
= codestream_peek ();
557 /* Break if not `pushl' instrunction. */
558 if (op
< 0x50 || op
> 0x57)
563 /* The native cc on SVR4 in -K PIC mode inserts the following code
564 to get the address of the global offset table (GOT) into register
569 movl %ebx,x(%ebp) (optional)
572 This code is with the rest of the prologue (at the end of the
573 function), so we have to skip it to get to the first real
574 instruction at the start of the function. */
576 pos
= codestream_tell ();
577 for (i
= 0; i
< 6; i
++)
579 op
= codestream_get ();
580 if (pic_pat
[i
] != op
)
585 unsigned char buf
[4];
588 op
= codestream_get ();
589 if (op
== 0x89) /* movl %ebx, x(%ebp) */
591 op
= codestream_get ();
592 if (op
== 0x5d) /* One byte offset from %ebp. */
595 codestream_read (buf
, 1);
597 else if (op
== 0x9d) /* Four byte offset from %ebp. */
600 codestream_read (buf
, 4);
602 else /* Unexpected instruction. */
604 op
= codestream_get ();
607 if (delta
> 0 && op
== 0x81 && codestream_get () == 0xc3)
612 codestream_seek (pos
);
616 return (codestream_tell ());
620 i386_push_dummy_frame (void)
622 CORE_ADDR sp
= read_register (SP_REGNUM
);
624 char regbuf
[MAX_REGISTER_RAW_SIZE
];
626 sp
= push_word (sp
, read_register (PC_REGNUM
));
627 sp
= push_word (sp
, read_register (FP_REGNUM
));
628 write_register (FP_REGNUM
, sp
);
629 for (regnum
= 0; regnum
< NUM_REGS
; regnum
++)
631 read_register_gen (regnum
, regbuf
);
632 sp
= push_bytes (sp
, regbuf
, REGISTER_RAW_SIZE (regnum
));
634 write_register (SP_REGNUM
, sp
);
637 /* Insert the (relative) function address into the call sequence
641 i386_fix_call_dummy (char *dummy
, CORE_ADDR pc
, CORE_ADDR fun
, int nargs
,
642 value_ptr
*args
, struct type
*type
, int gcc_p
)
644 int from
, to
, delta
, loc
;
646 loc
= (int)(read_register (SP_REGNUM
) - CALL_DUMMY_LENGTH
);
651 *((char *)(dummy
) + 1) = (delta
& 0xff);
652 *((char *)(dummy
) + 2) = ((delta
>> 8) & 0xff);
653 *((char *)(dummy
) + 3) = ((delta
>> 16) & 0xff);
654 *((char *)(dummy
) + 4) = ((delta
>> 24) & 0xff);
658 i386_pop_frame (void)
660 struct frame_info
*frame
= get_current_frame ();
663 char regbuf
[MAX_REGISTER_RAW_SIZE
];
665 fp
= FRAME_FP (frame
);
666 i386_frame_init_saved_regs (frame
);
668 for (regnum
= 0; regnum
< NUM_REGS
; regnum
++)
671 addr
= frame
->saved_regs
[regnum
];
674 read_memory (addr
, regbuf
, REGISTER_RAW_SIZE (regnum
));
675 write_register_bytes (REGISTER_BYTE (regnum
), regbuf
,
676 REGISTER_RAW_SIZE (regnum
));
679 write_register (FP_REGNUM
, read_memory_integer (fp
, 4));
680 write_register (PC_REGNUM
, read_memory_integer (fp
+ 4, 4));
681 write_register (SP_REGNUM
, fp
+ 8);
682 flush_cached_frames ();
686 #ifdef GET_LONGJMP_TARGET
688 /* Figure out where the longjmp will land. Slurp the args out of the
689 stack. We expect the first arg to be a pointer to the jmp_buf
690 structure from which we extract the pc (JB_PC) that we will land
691 at. The pc is copied into PC. This routine returns true on
695 get_longjmp_target (CORE_ADDR
*pc
)
697 char buf
[TARGET_PTR_BIT
/ TARGET_CHAR_BIT
];
698 CORE_ADDR sp
, jb_addr
;
700 sp
= read_register (SP_REGNUM
);
702 if (target_read_memory (sp
+ SP_ARG0
, /* Offset of first arg on stack. */
704 TARGET_PTR_BIT
/ TARGET_CHAR_BIT
))
707 jb_addr
= extract_address (buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
709 if (target_read_memory (jb_addr
+ JB_PC
* JB_ELEMENT_SIZE
, buf
,
710 TARGET_PTR_BIT
/ TARGET_CHAR_BIT
))
713 *pc
= extract_address (buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
718 #endif /* GET_LONGJMP_TARGET */
722 i386_push_arguments (int nargs
, value_ptr
*args
, CORE_ADDR sp
,
723 int struct_return
, CORE_ADDR struct_addr
)
725 sp
= default_push_arguments (nargs
, args
, sp
, struct_return
, struct_addr
);
732 store_address (buf
, 4, struct_addr
);
733 write_memory (sp
, buf
, 4);
740 i386_store_struct_return (CORE_ADDR addr
, CORE_ADDR sp
)
742 /* Do nothing. Everything was already done by i386_push_arguments. */
745 /* These registers are used for returning integers (and on some
746 targets also for returning `struct' and `union' values when their
747 size and alignment match an integer type). */
748 #define LOW_RETURN_REGNUM 0 /* %eax */
749 #define HIGH_RETURN_REGNUM 2 /* %edx */
751 /* Extract from an array REGBUF containing the (raw) register state, a
752 function return value of TYPE, and copy that, in virtual format,
756 i386_extract_return_value (struct type
*type
, char *regbuf
, char *valbuf
)
758 int len
= TYPE_LENGTH (type
);
760 if (TYPE_CODE (type
) == TYPE_CODE_STRUCT
761 && TYPE_NFIELDS (type
) == 1)
763 i386_extract_return_value (TYPE_FIELD_TYPE (type
, 0), regbuf
, valbuf
);
767 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
771 warning ("Cannot find floating-point return value.");
772 memset (valbuf
, 0, len
);
776 /* Floating-point return values can be found in %st(0). */
777 if (len
== TARGET_LONG_DOUBLE_BIT
/ TARGET_CHAR_BIT
778 && TARGET_LONG_DOUBLE_FORMAT
== &floatformat_i387_ext
)
780 /* Copy straight over, but take care of the padding. */
781 memcpy (valbuf
, ®buf
[REGISTER_BYTE (FP0_REGNUM
)],
783 memset (valbuf
+ FPU_REG_RAW_SIZE
, 0, len
- FPU_REG_RAW_SIZE
);
787 /* Convert the extended floating-point number found in
788 %st(0) to the desired type. This is probably not exactly
789 how it would happen on the target itself, but it is the
792 floatformat_to_doublest (&floatformat_i387_ext
,
793 ®buf
[REGISTER_BYTE (FP0_REGNUM
)], &val
);
794 store_floating (valbuf
, TYPE_LENGTH (type
), val
);
799 int low_size
= REGISTER_RAW_SIZE (LOW_RETURN_REGNUM
);
800 int high_size
= REGISTER_RAW_SIZE (HIGH_RETURN_REGNUM
);
803 memcpy (valbuf
, ®buf
[REGISTER_BYTE (LOW_RETURN_REGNUM
)], len
);
804 else if (len
<= (low_size
+ high_size
))
807 ®buf
[REGISTER_BYTE (LOW_RETURN_REGNUM
)], low_size
);
808 memcpy (valbuf
+ low_size
,
809 ®buf
[REGISTER_BYTE (HIGH_RETURN_REGNUM
)], len
- low_size
);
812 internal_error (__FILE__
, __LINE__
,
813 "Cannot extract return value of %d bytes long.", len
);
817 /* Write into the appropriate registers a function return value stored
818 in VALBUF of type TYPE, given in virtual format. */
821 i386_store_return_value (struct type
*type
, char *valbuf
)
823 int len
= TYPE_LENGTH (type
);
825 if (TYPE_CODE (type
) == TYPE_CODE_STRUCT
826 && TYPE_NFIELDS (type
) == 1)
828 i386_store_return_value (TYPE_FIELD_TYPE (type
, 0), valbuf
);
832 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
836 warning ("Cannot set floating-point return value.");
840 /* Floating-point return values can be found in %st(0). */
841 if (len
== TARGET_LONG_DOUBLE_BIT
/ TARGET_CHAR_BIT
842 && TARGET_LONG_DOUBLE_FORMAT
== &floatformat_i387_ext
)
844 /* Copy straight over. */
845 write_register_bytes (REGISTER_BYTE (FP0_REGNUM
), valbuf
,
850 char buf
[FPU_REG_RAW_SIZE
];
853 /* Convert the value found in VALBUF to the extended
854 floating point format used by the FPU. This is probably
855 not exactly how it would happen on the target itself, but
856 it is the best we can do. */
857 val
= extract_floating (valbuf
, TYPE_LENGTH (type
));
858 floatformat_from_doublest (&floatformat_i387_ext
, &val
, buf
);
859 write_register_bytes (REGISTER_BYTE (FP0_REGNUM
), buf
,
865 int low_size
= REGISTER_RAW_SIZE (LOW_RETURN_REGNUM
);
866 int high_size
= REGISTER_RAW_SIZE (HIGH_RETURN_REGNUM
);
869 write_register_bytes (REGISTER_BYTE (LOW_RETURN_REGNUM
), valbuf
, len
);
870 else if (len
<= (low_size
+ high_size
))
872 write_register_bytes (REGISTER_BYTE (LOW_RETURN_REGNUM
),
874 write_register_bytes (REGISTER_BYTE (HIGH_RETURN_REGNUM
),
875 valbuf
+ low_size
, len
- low_size
);
878 internal_error (__FILE__
, __LINE__
,
879 "Cannot store return value of %d bytes long.", len
);
883 /* Extract from an array REGBUF containing the (raw) register state
884 the address in which a function should return its structure value,
888 i386_extract_struct_value_address (char *regbuf
)
890 return extract_address (®buf
[REGISTER_BYTE (LOW_RETURN_REGNUM
)],
891 REGISTER_RAW_SIZE (LOW_RETURN_REGNUM
));
895 /* Convert data from raw format for register REGNUM in buffer FROM to
896 virtual format with type TYPE in buffer TO. In principle both
897 formats are identical except that the virtual format has two extra
898 bytes appended that aren't used. We set these to zero. */
901 i386_register_convert_to_virtual (int regnum
, struct type
*type
,
902 char *from
, char *to
)
904 /* Copy straight over, but take care of the padding. */
905 memcpy (to
, from
, FPU_REG_RAW_SIZE
);
906 memset (to
+ FPU_REG_RAW_SIZE
, 0, TYPE_LENGTH (type
) - FPU_REG_RAW_SIZE
);
909 /* Convert data from virtual format with type TYPE in buffer FROM to
910 raw format for register REGNUM in buffer TO. Simply omit the two
914 i386_register_convert_to_raw (struct type
*type
, int regnum
,
915 char *from
, char *to
)
917 memcpy (to
, from
, FPU_REG_RAW_SIZE
);
921 #ifdef I386V4_SIGTRAMP_SAVED_PC
922 /* Get saved user PC for sigtramp from the pushed ucontext on the
923 stack for all three variants of SVR4 sigtramps. */
926 i386v4_sigtramp_saved_pc (struct frame_info
*frame
)
928 CORE_ADDR saved_pc_offset
= 4;
931 find_pc_partial_function (frame
->pc
, &name
, NULL
, NULL
);
934 if (STREQ (name
, "_sigreturn"))
935 saved_pc_offset
= 132 + 14 * 4;
936 else if (STREQ (name
, "_sigacthandler"))
937 saved_pc_offset
= 80 + 14 * 4;
938 else if (STREQ (name
, "sigvechandler"))
939 saved_pc_offset
= 120 + 14 * 4;
943 return read_memory_integer (frame
->next
->frame
+ saved_pc_offset
, 4);
944 return read_memory_integer (read_register (SP_REGNUM
) + saved_pc_offset
, 4);
946 #endif /* I386V4_SIGTRAMP_SAVED_PC */
949 #ifdef STATIC_TRANSFORM_NAME
950 /* SunPRO encodes the static variables. This is not related to C++
951 mangling, it is done for C too. */
954 sunpro_static_transform_name (char *name
)
957 if (IS_STATIC_TRANSFORM_NAME (name
))
959 /* For file-local statics there will be a period, a bunch of
960 junk (the contents of which match a string given in the
961 N_OPT), a period and the name. For function-local statics
962 there will be a bunch of junk (which seems to change the
963 second character from 'A' to 'B'), a period, the name of the
964 function, and the name. So just skip everything before the
966 p
= strrchr (name
, '.');
972 #endif /* STATIC_TRANSFORM_NAME */
975 /* Stuff for WIN32 PE style DLL's but is pretty generic really. */
978 skip_trampoline_code (CORE_ADDR pc
, char *name
)
980 if (pc
&& read_memory_unsigned_integer (pc
, 2) == 0x25ff) /* jmp *(dest) */
982 unsigned long indirect
= read_memory_unsigned_integer (pc
+ 2, 4);
983 struct minimal_symbol
*indsym
=
984 indirect
? lookup_minimal_symbol_by_pc (indirect
) : 0;
985 char *symname
= indsym
? SYMBOL_NAME (indsym
) : 0;
989 if (strncmp (symname
, "__imp_", 6) == 0
990 || strncmp (symname
, "_imp_", 5) == 0)
991 return name
? 1 : read_memory_unsigned_integer (indirect
, 4);
994 return 0; /* Not a trampoline. */
998 /* We have two flavours of disassembly. The machinery on this page
999 deals with switching between those. */
1002 gdb_print_insn_i386 (bfd_vma memaddr
, disassemble_info
*info
)
1004 if (disassembly_flavor
== att_flavor
)
1005 return print_insn_i386_att (memaddr
, info
);
1006 else if (disassembly_flavor
== intel_flavor
)
1007 return print_insn_i386_intel (memaddr
, info
);
1008 /* Never reached -- disassembly_flavour is always either att_flavor
1010 internal_error (__FILE__
, __LINE__
, "failed internal consistency check");
1013 /* If the disassembly mode is intel, we have to also switch the bfd
1014 mach_type. This function is run in the set disassembly_flavor
1015 command, and does that. */
1018 set_disassembly_flavor_sfunc (char *args
, int from_tty
,
1019 struct cmd_list_element
*c
)
1021 set_disassembly_flavor ();
1025 set_disassembly_flavor (void)
1027 if (disassembly_flavor
== att_flavor
)
1028 set_architecture_from_arch_mach (bfd_arch_i386
, bfd_mach_i386_i386
);
1029 else if (disassembly_flavor
== intel_flavor
)
1030 set_architecture_from_arch_mach (bfd_arch_i386
,
1031 bfd_mach_i386_i386_intel_syntax
);
1035 /* Provide a prototype to silence -Wmissing-prototypes. */
1036 void _initialize_i386_tdep (void);
1039 _initialize_i386_tdep (void)
1041 /* Initialize the table saying where each register starts in the
1047 for (i
= 0; i
< MAX_NUM_REGS
; i
++)
1049 i386_register_byte
[i
] = offset
;
1050 offset
+= i386_register_raw_size
[i
];
1054 /* Initialize the table of virtual register sizes. */
1058 for (i
= 0; i
< MAX_NUM_REGS
; i
++)
1059 i386_register_virtual_size
[i
] = TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (i
));
1062 tm_print_insn
= gdb_print_insn_i386
;
1063 tm_print_insn_info
.mach
= bfd_lookup_arch (bfd_arch_i386
, 0)->mach
;
1065 /* Add the variable that controls the disassembly flavor. */
1067 struct cmd_list_element
*new_cmd
;
1069 new_cmd
= add_set_enum_cmd ("disassembly-flavor", no_class
,
1071 &disassembly_flavor
,
1073 Set the disassembly flavor, the valid values are \"att\" and \"intel\", \
1074 and the default value is \"att\".",
1076 new_cmd
->function
.sfunc
= set_disassembly_flavor_sfunc
;
1077 add_show_from_set (new_cmd
, &showlist
);
1080 /* Finally, initialize the disassembly flavor to the default given
1081 in the disassembly_flavor variable. */
1082 set_disassembly_flavor ();