Commit | Line | Data |
---|---|---|
c906108c | 1 | /* Intel 386 target-dependent stuff. |
349c5d5f AC |
2 | |
3 | Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, | |
4 | 1997, 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc. | |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
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. | |
c906108c | 12 | |
c5aa993b JM |
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. | |
c906108c | 17 | |
c5aa993b JM |
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. */ | |
c906108c SS |
22 | |
23 | #include "defs.h" | |
24 | #include "gdb_string.h" | |
25 | #include "frame.h" | |
26 | #include "inferior.h" | |
27 | #include "gdbcore.h" | |
28 | #include "target.h" | |
29 | #include "floatformat.h" | |
30 | #include "symtab.h" | |
31 | #include "gdbcmd.h" | |
32 | #include "command.h" | |
b4a20239 | 33 | #include "arch-utils.h" |
4e052eda | 34 | #include "regcache.h" |
d16aafd8 | 35 | #include "doublest.h" |
fd0407d6 | 36 | #include "value.h" |
3d261580 MK |
37 | #include "gdb_assert.h" |
38 | ||
d2a7c97a MK |
39 | #include "i386-tdep.h" |
40 | ||
fc633446 MK |
41 | /* Names of the registers. The first 10 registers match the register |
42 | numbering scheme used by GCC for stabs and DWARF. */ | |
43 | static char *i386_register_names[] = | |
44 | { | |
45 | "eax", "ecx", "edx", "ebx", | |
46 | "esp", "ebp", "esi", "edi", | |
47 | "eip", "eflags", "cs", "ss", | |
48 | "ds", "es", "fs", "gs", | |
49 | "st0", "st1", "st2", "st3", | |
50 | "st4", "st5", "st6", "st7", | |
51 | "fctrl", "fstat", "ftag", "fiseg", | |
52 | "fioff", "foseg", "fooff", "fop", | |
53 | "xmm0", "xmm1", "xmm2", "xmm3", | |
54 | "xmm4", "xmm5", "xmm6", "xmm7", | |
55 | "mxcsr" | |
56 | }; | |
57 | ||
1a11ba71 | 58 | /* i386_register_offset[i] is the offset into the register file of the |
917317f4 | 59 | start of register number i. We initialize this from |
1a11ba71 MK |
60 | i386_register_size. */ |
61 | static int i386_register_offset[MAX_NUM_REGS]; | |
917317f4 | 62 | |
1a11ba71 MK |
63 | /* i386_register_size[i] is the number of bytes of storage in GDB's |
64 | register array occupied by register i. */ | |
65 | static int i386_register_size[MAX_NUM_REGS] = { | |
917317f4 JM |
66 | 4, 4, 4, 4, |
67 | 4, 4, 4, 4, | |
68 | 4, 4, 4, 4, | |
69 | 4, 4, 4, 4, | |
70 | 10, 10, 10, 10, | |
71 | 10, 10, 10, 10, | |
72 | 4, 4, 4, 4, | |
73 | 4, 4, 4, 4, | |
74 | 16, 16, 16, 16, | |
75 | 16, 16, 16, 16, | |
76 | 4 | |
77 | }; | |
78 | ||
fc633446 MK |
79 | /* Return the name of register REG. */ |
80 | ||
81 | char * | |
82 | i386_register_name (int reg) | |
83 | { | |
84 | if (reg < 0) | |
85 | return NULL; | |
86 | if (reg >= sizeof (i386_register_names) / sizeof (*i386_register_names)) | |
87 | return NULL; | |
88 | ||
89 | return i386_register_names[reg]; | |
90 | } | |
91 | ||
1a11ba71 MK |
92 | /* Return the offset into the register array of the start of register |
93 | number REG. */ | |
94 | int | |
95 | i386_register_byte (int reg) | |
96 | { | |
97 | return i386_register_offset[reg]; | |
98 | } | |
99 | ||
100 | /* Return the number of bytes of storage in GDB's register array | |
101 | occupied by register REG. */ | |
102 | ||
103 | int | |
104 | i386_register_raw_size (int reg) | |
105 | { | |
106 | return i386_register_size[reg]; | |
107 | } | |
108 | ||
109 | /* Return the size in bytes of the virtual type of register REG. */ | |
110 | ||
111 | int | |
112 | i386_register_virtual_size (int reg) | |
113 | { | |
114 | return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (reg)); | |
115 | } | |
116 | ||
85540d8c MK |
117 | /* Convert stabs register number REG to the appropriate register |
118 | number used by GDB. */ | |
119 | ||
8201327c | 120 | static int |
85540d8c MK |
121 | i386_stab_reg_to_regnum (int reg) |
122 | { | |
123 | /* This implements what GCC calls the "default" register map. */ | |
124 | if (reg >= 0 && reg <= 7) | |
125 | { | |
126 | /* General registers. */ | |
127 | return reg; | |
128 | } | |
129 | else if (reg >= 12 && reg <= 19) | |
130 | { | |
131 | /* Floating-point registers. */ | |
132 | return reg - 12 + FP0_REGNUM; | |
133 | } | |
134 | else if (reg >= 21 && reg <= 28) | |
135 | { | |
136 | /* SSE registers. */ | |
137 | return reg - 21 + XMM0_REGNUM; | |
138 | } | |
139 | else if (reg >= 29 && reg <= 36) | |
140 | { | |
141 | /* MMX registers. */ | |
142 | /* FIXME: kettenis/2001-07-28: Should we have the MMX registers | |
143 | as pseudo-registers? */ | |
144 | return reg - 29 + FP0_REGNUM; | |
145 | } | |
146 | ||
147 | /* This will hopefully provoke a warning. */ | |
148 | return NUM_REGS + NUM_PSEUDO_REGS; | |
149 | } | |
150 | ||
8201327c | 151 | /* Convert DWARF register number REG to the appropriate register |
85540d8c MK |
152 | number used by GDB. */ |
153 | ||
8201327c | 154 | static int |
85540d8c MK |
155 | i386_dwarf_reg_to_regnum (int reg) |
156 | { | |
157 | /* The DWARF register numbering includes %eip and %eflags, and | |
158 | numbers the floating point registers differently. */ | |
159 | if (reg >= 0 && reg <= 9) | |
160 | { | |
161 | /* General registers. */ | |
162 | return reg; | |
163 | } | |
164 | else if (reg >= 11 && reg <= 18) | |
165 | { | |
166 | /* Floating-point registers. */ | |
167 | return reg - 11 + FP0_REGNUM; | |
168 | } | |
169 | else if (reg >= 21) | |
170 | { | |
171 | /* The SSE and MMX registers have identical numbers as in stabs. */ | |
172 | return i386_stab_reg_to_regnum (reg); | |
173 | } | |
174 | ||
175 | /* This will hopefully provoke a warning. */ | |
176 | return NUM_REGS + NUM_PSEUDO_REGS; | |
177 | } | |
fc338970 | 178 | \f |
917317f4 | 179 | |
fc338970 MK |
180 | /* This is the variable that is set with "set disassembly-flavor", and |
181 | its legitimate values. */ | |
53904c9e AC |
182 | static const char att_flavor[] = "att"; |
183 | static const char intel_flavor[] = "intel"; | |
184 | static const char *valid_flavors[] = | |
c5aa993b | 185 | { |
c906108c SS |
186 | att_flavor, |
187 | intel_flavor, | |
188 | NULL | |
189 | }; | |
53904c9e | 190 | static const char *disassembly_flavor = att_flavor; |
c906108c | 191 | |
fc338970 MK |
192 | /* Stdio style buffering was used to minimize calls to ptrace, but |
193 | this buffering did not take into account that the code section | |
194 | being accessed may not be an even number of buffers long (even if | |
195 | the buffer is only sizeof(int) long). In cases where the code | |
196 | section size happened to be a non-integral number of buffers long, | |
197 | attempting to read the last buffer would fail. Simply using | |
198 | target_read_memory and ignoring errors, rather than read_memory, is | |
199 | not the correct solution, since legitimate access errors would then | |
200 | be totally ignored. To properly handle this situation and continue | |
201 | to use buffering would require that this code be able to determine | |
202 | the minimum code section size granularity (not the alignment of the | |
203 | section itself, since the actual failing case that pointed out this | |
204 | problem had a section alignment of 4 but was not a multiple of 4 | |
205 | bytes long), on a target by target basis, and then adjust it's | |
206 | buffer size accordingly. This is messy, but potentially feasible. | |
207 | It probably needs the bfd library's help and support. For now, the | |
208 | buffer size is set to 1. (FIXME -fnf) */ | |
209 | ||
210 | #define CODESTREAM_BUFSIZ 1 /* Was sizeof(int), see note above. */ | |
c906108c SS |
211 | static CORE_ADDR codestream_next_addr; |
212 | static CORE_ADDR codestream_addr; | |
213 | static unsigned char codestream_buf[CODESTREAM_BUFSIZ]; | |
214 | static int codestream_off; | |
215 | static int codestream_cnt; | |
216 | ||
217 | #define codestream_tell() (codestream_addr + codestream_off) | |
fc338970 MK |
218 | #define codestream_peek() \ |
219 | (codestream_cnt == 0 ? \ | |
220 | codestream_fill(1) : codestream_buf[codestream_off]) | |
221 | #define codestream_get() \ | |
222 | (codestream_cnt-- == 0 ? \ | |
223 | codestream_fill(0) : codestream_buf[codestream_off++]) | |
c906108c | 224 | |
c5aa993b | 225 | static unsigned char |
fba45db2 | 226 | codestream_fill (int peek_flag) |
c906108c SS |
227 | { |
228 | codestream_addr = codestream_next_addr; | |
229 | codestream_next_addr += CODESTREAM_BUFSIZ; | |
230 | codestream_off = 0; | |
231 | codestream_cnt = CODESTREAM_BUFSIZ; | |
232 | read_memory (codestream_addr, (char *) codestream_buf, CODESTREAM_BUFSIZ); | |
c5aa993b | 233 | |
c906108c | 234 | if (peek_flag) |
c5aa993b | 235 | return (codestream_peek ()); |
c906108c | 236 | else |
c5aa993b | 237 | return (codestream_get ()); |
c906108c SS |
238 | } |
239 | ||
240 | static void | |
fba45db2 | 241 | codestream_seek (CORE_ADDR place) |
c906108c SS |
242 | { |
243 | codestream_next_addr = place / CODESTREAM_BUFSIZ; | |
244 | codestream_next_addr *= CODESTREAM_BUFSIZ; | |
245 | codestream_cnt = 0; | |
246 | codestream_fill (1); | |
c5aa993b | 247 | while (codestream_tell () != place) |
c906108c SS |
248 | codestream_get (); |
249 | } | |
250 | ||
251 | static void | |
fba45db2 | 252 | codestream_read (unsigned char *buf, int count) |
c906108c SS |
253 | { |
254 | unsigned char *p; | |
255 | int i; | |
256 | p = buf; | |
257 | for (i = 0; i < count; i++) | |
258 | *p++ = codestream_get (); | |
259 | } | |
fc338970 | 260 | \f |
c906108c | 261 | |
fc338970 | 262 | /* If the next instruction is a jump, move to its target. */ |
c906108c SS |
263 | |
264 | static void | |
fba45db2 | 265 | i386_follow_jump (void) |
c906108c SS |
266 | { |
267 | unsigned char buf[4]; | |
268 | long delta; | |
269 | ||
270 | int data16; | |
271 | CORE_ADDR pos; | |
272 | ||
273 | pos = codestream_tell (); | |
274 | ||
275 | data16 = 0; | |
276 | if (codestream_peek () == 0x66) | |
277 | { | |
278 | codestream_get (); | |
279 | data16 = 1; | |
280 | } | |
281 | ||
282 | switch (codestream_get ()) | |
283 | { | |
284 | case 0xe9: | |
fc338970 | 285 | /* Relative jump: if data16 == 0, disp32, else disp16. */ |
c906108c SS |
286 | if (data16) |
287 | { | |
288 | codestream_read (buf, 2); | |
289 | delta = extract_signed_integer (buf, 2); | |
290 | ||
fc338970 MK |
291 | /* Include the size of the jmp instruction (including the |
292 | 0x66 prefix). */ | |
c5aa993b | 293 | pos += delta + 4; |
c906108c SS |
294 | } |
295 | else | |
296 | { | |
297 | codestream_read (buf, 4); | |
298 | delta = extract_signed_integer (buf, 4); | |
299 | ||
300 | pos += delta + 5; | |
301 | } | |
302 | break; | |
303 | case 0xeb: | |
fc338970 | 304 | /* Relative jump, disp8 (ignore data16). */ |
c906108c SS |
305 | codestream_read (buf, 1); |
306 | /* Sign-extend it. */ | |
307 | delta = extract_signed_integer (buf, 1); | |
308 | ||
309 | pos += delta + 2; | |
310 | break; | |
311 | } | |
312 | codestream_seek (pos); | |
313 | } | |
314 | ||
fc338970 MK |
315 | /* Find & return the amount a local space allocated, and advance the |
316 | codestream to the first register push (if any). | |
317 | ||
318 | If the entry sequence doesn't make sense, return -1, and leave | |
319 | codestream pointer at a random spot. */ | |
c906108c SS |
320 | |
321 | static long | |
fba45db2 | 322 | i386_get_frame_setup (CORE_ADDR pc) |
c906108c SS |
323 | { |
324 | unsigned char op; | |
325 | ||
326 | codestream_seek (pc); | |
327 | ||
328 | i386_follow_jump (); | |
329 | ||
330 | op = codestream_get (); | |
331 | ||
332 | if (op == 0x58) /* popl %eax */ | |
333 | { | |
fc338970 MK |
334 | /* This function must start with |
335 | ||
336 | popl %eax 0x58 | |
337 | xchgl %eax, (%esp) 0x87 0x04 0x24 | |
338 | or xchgl %eax, 0(%esp) 0x87 0x44 0x24 0x00 | |
339 | ||
340 | (the System V compiler puts out the second `xchg' | |
341 | instruction, and the assembler doesn't try to optimize it, so | |
342 | the 'sib' form gets generated). This sequence is used to get | |
343 | the address of the return buffer for a function that returns | |
344 | a structure. */ | |
c906108c SS |
345 | int pos; |
346 | unsigned char buf[4]; | |
fc338970 MK |
347 | static unsigned char proto1[3] = { 0x87, 0x04, 0x24 }; |
348 | static unsigned char proto2[4] = { 0x87, 0x44, 0x24, 0x00 }; | |
349 | ||
c906108c SS |
350 | pos = codestream_tell (); |
351 | codestream_read (buf, 4); | |
352 | if (memcmp (buf, proto1, 3) == 0) | |
353 | pos += 3; | |
354 | else if (memcmp (buf, proto2, 4) == 0) | |
355 | pos += 4; | |
356 | ||
357 | codestream_seek (pos); | |
fc338970 | 358 | op = codestream_get (); /* Update next opcode. */ |
c906108c SS |
359 | } |
360 | ||
361 | if (op == 0x68 || op == 0x6a) | |
362 | { | |
fc338970 MK |
363 | /* This function may start with |
364 | ||
365 | pushl constant | |
366 | call _probe | |
367 | addl $4, %esp | |
368 | ||
369 | followed by | |
370 | ||
371 | pushl %ebp | |
372 | ||
373 | etc. */ | |
c906108c SS |
374 | int pos; |
375 | unsigned char buf[8]; | |
376 | ||
fc338970 | 377 | /* Skip past the `pushl' instruction; it has either a one-byte |
c906108c SS |
378 | or a four-byte operand, depending on the opcode. */ |
379 | pos = codestream_tell (); | |
380 | if (op == 0x68) | |
381 | pos += 4; | |
382 | else | |
383 | pos += 1; | |
384 | codestream_seek (pos); | |
385 | ||
fc338970 MK |
386 | /* Read the following 8 bytes, which should be "call _probe" (6 |
387 | bytes) followed by "addl $4,%esp" (2 bytes). */ | |
c906108c SS |
388 | codestream_read (buf, sizeof (buf)); |
389 | if (buf[0] == 0xe8 && buf[6] == 0xc4 && buf[7] == 0x4) | |
390 | pos += sizeof (buf); | |
391 | codestream_seek (pos); | |
fc338970 | 392 | op = codestream_get (); /* Update next opcode. */ |
c906108c SS |
393 | } |
394 | ||
395 | if (op == 0x55) /* pushl %ebp */ | |
c5aa993b | 396 | { |
fc338970 | 397 | /* Check for "movl %esp, %ebp" -- can be written in two ways. */ |
c906108c SS |
398 | switch (codestream_get ()) |
399 | { | |
400 | case 0x8b: | |
401 | if (codestream_get () != 0xec) | |
fc338970 | 402 | return -1; |
c906108c SS |
403 | break; |
404 | case 0x89: | |
405 | if (codestream_get () != 0xe5) | |
fc338970 | 406 | return -1; |
c906108c SS |
407 | break; |
408 | default: | |
fc338970 | 409 | return -1; |
c906108c | 410 | } |
fc338970 MK |
411 | /* Check for stack adjustment |
412 | ||
413 | subl $XXX, %esp | |
414 | ||
415 | NOTE: You can't subtract a 16 bit immediate from a 32 bit | |
416 | reg, so we don't have to worry about a data16 prefix. */ | |
c906108c SS |
417 | op = codestream_peek (); |
418 | if (op == 0x83) | |
419 | { | |
fc338970 | 420 | /* `subl' with 8 bit immediate. */ |
c906108c SS |
421 | codestream_get (); |
422 | if (codestream_get () != 0xec) | |
fc338970 | 423 | /* Some instruction starting with 0x83 other than `subl'. */ |
c906108c SS |
424 | { |
425 | codestream_seek (codestream_tell () - 2); | |
426 | return 0; | |
427 | } | |
fc338970 MK |
428 | /* `subl' with signed byte immediate (though it wouldn't |
429 | make sense to be negative). */ | |
c5aa993b | 430 | return (codestream_get ()); |
c906108c SS |
431 | } |
432 | else if (op == 0x81) | |
433 | { | |
434 | char buf[4]; | |
fc338970 | 435 | /* Maybe it is `subl' with a 32 bit immedediate. */ |
c5aa993b | 436 | codestream_get (); |
c906108c | 437 | if (codestream_get () != 0xec) |
fc338970 | 438 | /* Some instruction starting with 0x81 other than `subl'. */ |
c906108c SS |
439 | { |
440 | codestream_seek (codestream_tell () - 2); | |
441 | return 0; | |
442 | } | |
fc338970 | 443 | /* It is `subl' with a 32 bit immediate. */ |
c5aa993b | 444 | codestream_read ((unsigned char *) buf, 4); |
c906108c SS |
445 | return extract_signed_integer (buf, 4); |
446 | } | |
447 | else | |
448 | { | |
fc338970 | 449 | return 0; |
c906108c SS |
450 | } |
451 | } | |
452 | else if (op == 0xc8) | |
453 | { | |
454 | char buf[2]; | |
fc338970 | 455 | /* `enter' with 16 bit unsigned immediate. */ |
c5aa993b | 456 | codestream_read ((unsigned char *) buf, 2); |
fc338970 | 457 | codestream_get (); /* Flush final byte of enter instruction. */ |
c906108c SS |
458 | return extract_unsigned_integer (buf, 2); |
459 | } | |
460 | return (-1); | |
461 | } | |
462 | ||
c833a37e MK |
463 | /* Return the chain-pointer for FRAME. In the case of the i386, the |
464 | frame's nominal address is the address of a 4-byte word containing | |
465 | the calling frame's address. */ | |
466 | ||
8201327c | 467 | static CORE_ADDR |
c833a37e MK |
468 | i386_frame_chain (struct frame_info *frame) |
469 | { | |
470 | if (frame->signal_handler_caller) | |
471 | return frame->frame; | |
472 | ||
473 | if (! inside_entry_file (frame->pc)) | |
474 | return read_memory_unsigned_integer (frame->frame, 4); | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
539ffe0b MK |
479 | /* Determine whether the function invocation represented by FRAME does |
480 | not have a from on the stack associated with it. If it does not, | |
481 | return non-zero, otherwise return zero. */ | |
482 | ||
483 | int | |
484 | i386_frameless_function_invocation (struct frame_info *frame) | |
485 | { | |
486 | if (frame->signal_handler_caller) | |
487 | return 0; | |
488 | ||
489 | return frameless_look_for_prologue (frame); | |
490 | } | |
491 | ||
0d17c81d MK |
492 | /* Return the saved program counter for FRAME. */ |
493 | ||
8201327c | 494 | static CORE_ADDR |
0d17c81d MK |
495 | i386_frame_saved_pc (struct frame_info *frame) |
496 | { | |
0d17c81d | 497 | if (frame->signal_handler_caller) |
8201327c MK |
498 | { |
499 | CORE_ADDR (*sigtramp_saved_pc) (struct frame_info *); | |
500 | sigtramp_saved_pc = gdbarch_tdep (current_gdbarch)->sigtramp_saved_pc; | |
0d17c81d | 501 | |
8201327c MK |
502 | gdb_assert (sigtramp_saved_pc != NULL); |
503 | return sigtramp_saved_pc (frame); | |
504 | } | |
0d17c81d | 505 | |
8201327c | 506 | return read_memory_unsigned_integer (frame->frame + 4, 4); |
22797942 AC |
507 | } |
508 | ||
ed84f6c1 MK |
509 | /* Immediately after a function call, return the saved pc. */ |
510 | ||
8201327c | 511 | static CORE_ADDR |
ed84f6c1 MK |
512 | i386_saved_pc_after_call (struct frame_info *frame) |
513 | { | |
514 | return read_memory_unsigned_integer (read_register (SP_REGNUM), 4); | |
515 | } | |
516 | ||
c906108c SS |
517 | /* Return number of args passed to a frame. |
518 | Can return -1, meaning no way to tell. */ | |
519 | ||
520 | int | |
fba45db2 | 521 | i386_frame_num_args (struct frame_info *fi) |
c906108c SS |
522 | { |
523 | #if 1 | |
524 | return -1; | |
525 | #else | |
526 | /* This loses because not only might the compiler not be popping the | |
fc338970 MK |
527 | args right after the function call, it might be popping args from |
528 | both this call and a previous one, and we would say there are | |
529 | more args than there really are. */ | |
c906108c | 530 | |
c5aa993b JM |
531 | int retpc; |
532 | unsigned char op; | |
c906108c SS |
533 | struct frame_info *pfi; |
534 | ||
fc338970 | 535 | /* On the i386, the instruction following the call could be: |
c906108c SS |
536 | popl %ecx - one arg |
537 | addl $imm, %esp - imm/4 args; imm may be 8 or 32 bits | |
fc338970 | 538 | anything else - zero args. */ |
c906108c SS |
539 | |
540 | int frameless; | |
541 | ||
392a587b | 542 | frameless = FRAMELESS_FUNCTION_INVOCATION (fi); |
c906108c | 543 | if (frameless) |
fc338970 MK |
544 | /* In the absence of a frame pointer, GDB doesn't get correct |
545 | values for nameless arguments. Return -1, so it doesn't print | |
546 | any nameless arguments. */ | |
c906108c SS |
547 | return -1; |
548 | ||
c5aa993b | 549 | pfi = get_prev_frame (fi); |
c906108c SS |
550 | if (pfi == 0) |
551 | { | |
fc338970 MK |
552 | /* NOTE: This can happen if we are looking at the frame for |
553 | main, because FRAME_CHAIN_VALID won't let us go into start. | |
554 | If we have debugging symbols, that's not really a big deal; | |
555 | it just means it will only show as many arguments to main as | |
556 | are declared. */ | |
c906108c SS |
557 | return -1; |
558 | } | |
559 | else | |
560 | { | |
c5aa993b JM |
561 | retpc = pfi->pc; |
562 | op = read_memory_integer (retpc, 1); | |
fc338970 | 563 | if (op == 0x59) /* pop %ecx */ |
c5aa993b | 564 | return 1; |
c906108c SS |
565 | else if (op == 0x83) |
566 | { | |
c5aa993b JM |
567 | op = read_memory_integer (retpc + 1, 1); |
568 | if (op == 0xc4) | |
569 | /* addl $<signed imm 8 bits>, %esp */ | |
570 | return (read_memory_integer (retpc + 2, 1) & 0xff) / 4; | |
c906108c SS |
571 | else |
572 | return 0; | |
573 | } | |
fc338970 MK |
574 | else if (op == 0x81) /* `add' with 32 bit immediate. */ |
575 | { | |
c5aa993b JM |
576 | op = read_memory_integer (retpc + 1, 1); |
577 | if (op == 0xc4) | |
578 | /* addl $<imm 32>, %esp */ | |
579 | return read_memory_integer (retpc + 2, 4) / 4; | |
c906108c SS |
580 | else |
581 | return 0; | |
582 | } | |
583 | else | |
584 | { | |
585 | return 0; | |
586 | } | |
587 | } | |
588 | #endif | |
589 | } | |
590 | ||
fc338970 MK |
591 | /* Parse the first few instructions the function to see what registers |
592 | were stored. | |
593 | ||
594 | We handle these cases: | |
595 | ||
596 | The startup sequence can be at the start of the function, or the | |
597 | function can start with a branch to startup code at the end. | |
598 | ||
599 | %ebp can be set up with either the 'enter' instruction, or "pushl | |
600 | %ebp, movl %esp, %ebp" (`enter' is too slow to be useful, but was | |
601 | once used in the System V compiler). | |
602 | ||
603 | Local space is allocated just below the saved %ebp by either the | |
604 | 'enter' instruction, or by "subl $<size>, %esp". 'enter' has a 16 | |
605 | bit unsigned argument for space to allocate, and the 'addl' | |
606 | instruction could have either a signed byte, or 32 bit immediate. | |
607 | ||
608 | Next, the registers used by this function are pushed. With the | |
609 | System V compiler they will always be in the order: %edi, %esi, | |
610 | %ebx (and sometimes a harmless bug causes it to also save but not | |
611 | restore %eax); however, the code below is willing to see the pushes | |
612 | in any order, and will handle up to 8 of them. | |
613 | ||
614 | If the setup sequence is at the end of the function, then the next | |
615 | instruction will be a branch back to the start. */ | |
c906108c SS |
616 | |
617 | void | |
fba45db2 | 618 | i386_frame_init_saved_regs (struct frame_info *fip) |
c906108c SS |
619 | { |
620 | long locals = -1; | |
621 | unsigned char op; | |
622 | CORE_ADDR dummy_bottom; | |
fc338970 | 623 | CORE_ADDR addr; |
c906108c SS |
624 | CORE_ADDR pc; |
625 | int i; | |
c5aa993b | 626 | |
1211c4e4 AC |
627 | if (fip->saved_regs) |
628 | return; | |
629 | ||
630 | frame_saved_regs_zalloc (fip); | |
c5aa993b | 631 | |
fc338970 MK |
632 | /* If the frame is the end of a dummy, compute where the beginning |
633 | would be. */ | |
c906108c | 634 | dummy_bottom = fip->frame - 4 - REGISTER_BYTES - CALL_DUMMY_LENGTH; |
c5aa993b | 635 | |
fc338970 | 636 | /* Check if the PC points in the stack, in a dummy frame. */ |
c5aa993b | 637 | if (dummy_bottom <= fip->pc && fip->pc <= fip->frame) |
c906108c | 638 | { |
fc338970 MK |
639 | /* All registers were saved by push_call_dummy. */ |
640 | addr = fip->frame; | |
c5aa993b | 641 | for (i = 0; i < NUM_REGS; i++) |
c906108c | 642 | { |
fc338970 MK |
643 | addr -= REGISTER_RAW_SIZE (i); |
644 | fip->saved_regs[i] = addr; | |
c906108c SS |
645 | } |
646 | return; | |
647 | } | |
c5aa993b | 648 | |
c906108c SS |
649 | pc = get_pc_function_start (fip->pc); |
650 | if (pc != 0) | |
651 | locals = i386_get_frame_setup (pc); | |
c5aa993b JM |
652 | |
653 | if (locals >= 0) | |
c906108c | 654 | { |
fc338970 | 655 | addr = fip->frame - 4 - locals; |
c5aa993b | 656 | for (i = 0; i < 8; i++) |
c906108c SS |
657 | { |
658 | op = codestream_get (); | |
659 | if (op < 0x50 || op > 0x57) | |
660 | break; | |
661 | #ifdef I386_REGNO_TO_SYMMETRY | |
662 | /* Dynix uses different internal numbering. Ick. */ | |
fc338970 | 663 | fip->saved_regs[I386_REGNO_TO_SYMMETRY (op - 0x50)] = addr; |
c906108c | 664 | #else |
fc338970 | 665 | fip->saved_regs[op - 0x50] = addr; |
c906108c | 666 | #endif |
fc338970 | 667 | addr -= 4; |
c906108c SS |
668 | } |
669 | } | |
c5aa993b | 670 | |
1211c4e4 AC |
671 | fip->saved_regs[PC_REGNUM] = fip->frame + 4; |
672 | fip->saved_regs[FP_REGNUM] = fip->frame; | |
c906108c SS |
673 | } |
674 | ||
fc338970 | 675 | /* Return PC of first real instruction. */ |
c906108c SS |
676 | |
677 | int | |
fba45db2 | 678 | i386_skip_prologue (int pc) |
c906108c SS |
679 | { |
680 | unsigned char op; | |
681 | int i; | |
c5aa993b | 682 | static unsigned char pic_pat[6] = |
fc338970 MK |
683 | { 0xe8, 0, 0, 0, 0, /* call 0x0 */ |
684 | 0x5b, /* popl %ebx */ | |
c5aa993b | 685 | }; |
c906108c | 686 | CORE_ADDR pos; |
c5aa993b | 687 | |
c906108c SS |
688 | if (i386_get_frame_setup (pc) < 0) |
689 | return (pc); | |
c5aa993b | 690 | |
fc338970 MK |
691 | /* Found valid frame setup -- codestream now points to start of push |
692 | instructions for saving registers. */ | |
c5aa993b | 693 | |
fc338970 | 694 | /* Skip over register saves. */ |
c906108c SS |
695 | for (i = 0; i < 8; i++) |
696 | { | |
697 | op = codestream_peek (); | |
fc338970 | 698 | /* Break if not `pushl' instrunction. */ |
c5aa993b | 699 | if (op < 0x50 || op > 0x57) |
c906108c SS |
700 | break; |
701 | codestream_get (); | |
702 | } | |
703 | ||
fc338970 MK |
704 | /* The native cc on SVR4 in -K PIC mode inserts the following code |
705 | to get the address of the global offset table (GOT) into register | |
706 | %ebx | |
707 | ||
708 | call 0x0 | |
709 | popl %ebx | |
710 | movl %ebx,x(%ebp) (optional) | |
711 | addl y,%ebx | |
712 | ||
c906108c SS |
713 | This code is with the rest of the prologue (at the end of the |
714 | function), so we have to skip it to get to the first real | |
715 | instruction at the start of the function. */ | |
c5aa993b | 716 | |
c906108c SS |
717 | pos = codestream_tell (); |
718 | for (i = 0; i < 6; i++) | |
719 | { | |
720 | op = codestream_get (); | |
c5aa993b | 721 | if (pic_pat[i] != op) |
c906108c SS |
722 | break; |
723 | } | |
724 | if (i == 6) | |
725 | { | |
726 | unsigned char buf[4]; | |
727 | long delta = 6; | |
728 | ||
729 | op = codestream_get (); | |
c5aa993b | 730 | if (op == 0x89) /* movl %ebx, x(%ebp) */ |
c906108c SS |
731 | { |
732 | op = codestream_get (); | |
fc338970 | 733 | if (op == 0x5d) /* One byte offset from %ebp. */ |
c906108c SS |
734 | { |
735 | delta += 3; | |
736 | codestream_read (buf, 1); | |
737 | } | |
fc338970 | 738 | else if (op == 0x9d) /* Four byte offset from %ebp. */ |
c906108c SS |
739 | { |
740 | delta += 6; | |
741 | codestream_read (buf, 4); | |
742 | } | |
fc338970 | 743 | else /* Unexpected instruction. */ |
c5aa993b JM |
744 | delta = -1; |
745 | op = codestream_get (); | |
c906108c | 746 | } |
c5aa993b JM |
747 | /* addl y,%ebx */ |
748 | if (delta > 0 && op == 0x81 && codestream_get () == 0xc3) | |
c906108c | 749 | { |
c5aa993b | 750 | pos += delta + 6; |
c906108c SS |
751 | } |
752 | } | |
753 | codestream_seek (pos); | |
c5aa993b | 754 | |
c906108c | 755 | i386_follow_jump (); |
c5aa993b | 756 | |
c906108c SS |
757 | return (codestream_tell ()); |
758 | } | |
759 | ||
760 | void | |
fba45db2 | 761 | i386_push_dummy_frame (void) |
c906108c SS |
762 | { |
763 | CORE_ADDR sp = read_register (SP_REGNUM); | |
ec80a8ea | 764 | CORE_ADDR fp; |
c906108c SS |
765 | int regnum; |
766 | char regbuf[MAX_REGISTER_RAW_SIZE]; | |
c5aa993b | 767 | |
c906108c SS |
768 | sp = push_word (sp, read_register (PC_REGNUM)); |
769 | sp = push_word (sp, read_register (FP_REGNUM)); | |
ec80a8ea | 770 | fp = sp; |
c906108c SS |
771 | for (regnum = 0; regnum < NUM_REGS; regnum++) |
772 | { | |
773 | read_register_gen (regnum, regbuf); | |
774 | sp = push_bytes (sp, regbuf, REGISTER_RAW_SIZE (regnum)); | |
775 | } | |
776 | write_register (SP_REGNUM, sp); | |
ec80a8ea | 777 | write_register (FP_REGNUM, fp); |
c906108c SS |
778 | } |
779 | ||
a7769679 MK |
780 | /* Insert the (relative) function address into the call sequence |
781 | stored at DYMMY. */ | |
782 | ||
783 | void | |
784 | i386_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs, | |
ea7c478f | 785 | struct value **args, struct type *type, int gcc_p) |
a7769679 MK |
786 | { |
787 | int from, to, delta, loc; | |
788 | ||
789 | loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); | |
790 | from = loc + 5; | |
791 | to = (int)(fun); | |
792 | delta = to - from; | |
793 | ||
794 | *((char *)(dummy) + 1) = (delta & 0xff); | |
795 | *((char *)(dummy) + 2) = ((delta >> 8) & 0xff); | |
796 | *((char *)(dummy) + 3) = ((delta >> 16) & 0xff); | |
797 | *((char *)(dummy) + 4) = ((delta >> 24) & 0xff); | |
798 | } | |
799 | ||
c906108c | 800 | void |
fba45db2 | 801 | i386_pop_frame (void) |
c906108c SS |
802 | { |
803 | struct frame_info *frame = get_current_frame (); | |
804 | CORE_ADDR fp; | |
805 | int regnum; | |
c906108c | 806 | char regbuf[MAX_REGISTER_RAW_SIZE]; |
c5aa993b | 807 | |
c906108c | 808 | fp = FRAME_FP (frame); |
1211c4e4 AC |
809 | i386_frame_init_saved_regs (frame); |
810 | ||
c5aa993b | 811 | for (regnum = 0; regnum < NUM_REGS; regnum++) |
c906108c | 812 | { |
fc338970 MK |
813 | CORE_ADDR addr; |
814 | addr = frame->saved_regs[regnum]; | |
815 | if (addr) | |
c906108c | 816 | { |
fc338970 | 817 | read_memory (addr, regbuf, REGISTER_RAW_SIZE (regnum)); |
c906108c SS |
818 | write_register_bytes (REGISTER_BYTE (regnum), regbuf, |
819 | REGISTER_RAW_SIZE (regnum)); | |
820 | } | |
821 | } | |
822 | write_register (FP_REGNUM, read_memory_integer (fp, 4)); | |
823 | write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); | |
824 | write_register (SP_REGNUM, fp + 8); | |
825 | flush_cached_frames (); | |
826 | } | |
fc338970 | 827 | \f |
c906108c | 828 | |
fc338970 MK |
829 | /* Figure out where the longjmp will land. Slurp the args out of the |
830 | stack. We expect the first arg to be a pointer to the jmp_buf | |
8201327c MK |
831 | structure from which we extract the address that we will land at. |
832 | This address is copied into PC. This routine returns true on | |
fc338970 | 833 | success. */ |
c906108c | 834 | |
8201327c MK |
835 | static int |
836 | i386_get_longjmp_target (CORE_ADDR *pc) | |
c906108c | 837 | { |
8201327c | 838 | char buf[4]; |
c906108c | 839 | CORE_ADDR sp, jb_addr; |
8201327c | 840 | int jb_pc_offset = gdbarch_tdep (current_gdbarch)->jb_pc_offset; |
c906108c | 841 | |
8201327c MK |
842 | /* If JB_PC_OFFSET is -1, we have no way to find out where the |
843 | longjmp will land. */ | |
844 | if (jb_pc_offset == -1) | |
c906108c SS |
845 | return 0; |
846 | ||
8201327c MK |
847 | sp = read_register (SP_REGNUM); |
848 | if (target_read_memory (sp + 4, buf, 4)) | |
c906108c SS |
849 | return 0; |
850 | ||
8201327c MK |
851 | jb_addr = extract_address (buf, 4); |
852 | if (target_read_memory (jb_addr + jb_pc_offset, buf, 4)) | |
853 | return 0; | |
c906108c | 854 | |
8201327c | 855 | *pc = extract_address (buf, 4); |
c906108c SS |
856 | return 1; |
857 | } | |
fc338970 | 858 | \f |
c906108c | 859 | |
22f8ba57 | 860 | CORE_ADDR |
ea7c478f | 861 | i386_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
22f8ba57 MK |
862 | int struct_return, CORE_ADDR struct_addr) |
863 | { | |
864 | sp = default_push_arguments (nargs, args, sp, struct_return, struct_addr); | |
865 | ||
866 | if (struct_return) | |
867 | { | |
868 | char buf[4]; | |
869 | ||
870 | sp -= 4; | |
871 | store_address (buf, 4, struct_addr); | |
872 | write_memory (sp, buf, 4); | |
873 | } | |
874 | ||
875 | return sp; | |
876 | } | |
877 | ||
878 | void | |
879 | i386_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) | |
880 | { | |
881 | /* Do nothing. Everything was already done by i386_push_arguments. */ | |
882 | } | |
883 | ||
1a309862 MK |
884 | /* These registers are used for returning integers (and on some |
885 | targets also for returning `struct' and `union' values when their | |
ef9dff19 | 886 | size and alignment match an integer type). */ |
1a309862 MK |
887 | #define LOW_RETURN_REGNUM 0 /* %eax */ |
888 | #define HIGH_RETURN_REGNUM 2 /* %edx */ | |
889 | ||
890 | /* Extract from an array REGBUF containing the (raw) register state, a | |
891 | function return value of TYPE, and copy that, in virtual format, | |
892 | into VALBUF. */ | |
893 | ||
c906108c | 894 | void |
1a309862 | 895 | i386_extract_return_value (struct type *type, char *regbuf, char *valbuf) |
c906108c | 896 | { |
1a309862 MK |
897 | int len = TYPE_LENGTH (type); |
898 | ||
1e8d0a7b MK |
899 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
900 | && TYPE_NFIELDS (type) == 1) | |
3df1b9b4 MK |
901 | { |
902 | i386_extract_return_value (TYPE_FIELD_TYPE (type, 0), regbuf, valbuf); | |
903 | return; | |
904 | } | |
1e8d0a7b MK |
905 | |
906 | if (TYPE_CODE (type) == TYPE_CODE_FLT) | |
c906108c | 907 | { |
1a309862 MK |
908 | if (NUM_FREGS == 0) |
909 | { | |
910 | warning ("Cannot find floating-point return value."); | |
911 | memset (valbuf, 0, len); | |
ef9dff19 | 912 | return; |
1a309862 MK |
913 | } |
914 | ||
c6ba6f0d MK |
915 | /* Floating-point return values can be found in %st(0). Convert |
916 | its contents to the desired type. This is probably not | |
917 | exactly how it would happen on the target itself, but it is | |
918 | the best we can do. */ | |
919 | convert_typed_floating (®buf[REGISTER_BYTE (FP0_REGNUM)], | |
920 | builtin_type_i387_ext, valbuf, type); | |
c906108c SS |
921 | } |
922 | else | |
c5aa993b | 923 | { |
d4f3574e SS |
924 | int low_size = REGISTER_RAW_SIZE (LOW_RETURN_REGNUM); |
925 | int high_size = REGISTER_RAW_SIZE (HIGH_RETURN_REGNUM); | |
926 | ||
927 | if (len <= low_size) | |
1a309862 | 928 | memcpy (valbuf, ®buf[REGISTER_BYTE (LOW_RETURN_REGNUM)], len); |
d4f3574e SS |
929 | else if (len <= (low_size + high_size)) |
930 | { | |
931 | memcpy (valbuf, | |
1a309862 | 932 | ®buf[REGISTER_BYTE (LOW_RETURN_REGNUM)], low_size); |
d4f3574e | 933 | memcpy (valbuf + low_size, |
1a309862 | 934 | ®buf[REGISTER_BYTE (HIGH_RETURN_REGNUM)], len - low_size); |
d4f3574e SS |
935 | } |
936 | else | |
8e65ff28 AC |
937 | internal_error (__FILE__, __LINE__, |
938 | "Cannot extract return value of %d bytes long.", len); | |
c906108c SS |
939 | } |
940 | } | |
941 | ||
ef9dff19 MK |
942 | /* Write into the appropriate registers a function return value stored |
943 | in VALBUF of type TYPE, given in virtual format. */ | |
944 | ||
945 | void | |
946 | i386_store_return_value (struct type *type, char *valbuf) | |
947 | { | |
948 | int len = TYPE_LENGTH (type); | |
949 | ||
1e8d0a7b MK |
950 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
951 | && TYPE_NFIELDS (type) == 1) | |
3df1b9b4 MK |
952 | { |
953 | i386_store_return_value (TYPE_FIELD_TYPE (type, 0), valbuf); | |
954 | return; | |
955 | } | |
1e8d0a7b MK |
956 | |
957 | if (TYPE_CODE (type) == TYPE_CODE_FLT) | |
ef9dff19 | 958 | { |
ccb945b8 | 959 | unsigned int fstat; |
c6ba6f0d | 960 | char buf[FPU_REG_RAW_SIZE]; |
ccb945b8 | 961 | |
ef9dff19 MK |
962 | if (NUM_FREGS == 0) |
963 | { | |
964 | warning ("Cannot set floating-point return value."); | |
965 | return; | |
966 | } | |
967 | ||
635b0cc1 MK |
968 | /* Returning floating-point values is a bit tricky. Apart from |
969 | storing the return value in %st(0), we have to simulate the | |
970 | state of the FPU at function return point. */ | |
971 | ||
c6ba6f0d MK |
972 | /* Convert the value found in VALBUF to the extended |
973 | floating-point format used by the FPU. This is probably | |
974 | not exactly how it would happen on the target itself, but | |
975 | it is the best we can do. */ | |
976 | convert_typed_floating (valbuf, type, buf, builtin_type_i387_ext); | |
977 | write_register_bytes (REGISTER_BYTE (FP0_REGNUM), buf, | |
978 | FPU_REG_RAW_SIZE); | |
ccb945b8 | 979 | |
635b0cc1 MK |
980 | /* Set the top of the floating-point register stack to 7. The |
981 | actual value doesn't really matter, but 7 is what a normal | |
982 | function return would end up with if the program started out | |
983 | with a freshly initialized FPU. */ | |
ccb945b8 MK |
984 | fstat = read_register (FSTAT_REGNUM); |
985 | fstat |= (7 << 11); | |
986 | write_register (FSTAT_REGNUM, fstat); | |
987 | ||
635b0cc1 MK |
988 | /* Mark %st(1) through %st(7) as empty. Since we set the top of |
989 | the floating-point register stack to 7, the appropriate value | |
990 | for the tag word is 0x3fff. */ | |
ccb945b8 | 991 | write_register (FTAG_REGNUM, 0x3fff); |
ef9dff19 MK |
992 | } |
993 | else | |
994 | { | |
995 | int low_size = REGISTER_RAW_SIZE (LOW_RETURN_REGNUM); | |
996 | int high_size = REGISTER_RAW_SIZE (HIGH_RETURN_REGNUM); | |
997 | ||
998 | if (len <= low_size) | |
999 | write_register_bytes (REGISTER_BYTE (LOW_RETURN_REGNUM), valbuf, len); | |
1000 | else if (len <= (low_size + high_size)) | |
1001 | { | |
1002 | write_register_bytes (REGISTER_BYTE (LOW_RETURN_REGNUM), | |
1003 | valbuf, low_size); | |
1004 | write_register_bytes (REGISTER_BYTE (HIGH_RETURN_REGNUM), | |
1005 | valbuf + low_size, len - low_size); | |
1006 | } | |
1007 | else | |
8e65ff28 AC |
1008 | internal_error (__FILE__, __LINE__, |
1009 | "Cannot store return value of %d bytes long.", len); | |
ef9dff19 MK |
1010 | } |
1011 | } | |
f7af9647 MK |
1012 | |
1013 | /* Extract from an array REGBUF containing the (raw) register state | |
1014 | the address in which a function should return its structure value, | |
1015 | as a CORE_ADDR. */ | |
1016 | ||
1017 | CORE_ADDR | |
1018 | i386_extract_struct_value_address (char *regbuf) | |
1019 | { | |
1020 | return extract_address (®buf[REGISTER_BYTE (LOW_RETURN_REGNUM)], | |
1021 | REGISTER_RAW_SIZE (LOW_RETURN_REGNUM)); | |
1022 | } | |
fc338970 | 1023 | \f |
ef9dff19 | 1024 | |
8201327c MK |
1025 | /* This is the variable that is set with "set struct-convention", and |
1026 | its legitimate values. */ | |
1027 | static const char default_struct_convention[] = "default"; | |
1028 | static const char pcc_struct_convention[] = "pcc"; | |
1029 | static const char reg_struct_convention[] = "reg"; | |
1030 | static const char *valid_conventions[] = | |
1031 | { | |
1032 | default_struct_convention, | |
1033 | pcc_struct_convention, | |
1034 | reg_struct_convention, | |
1035 | NULL | |
1036 | }; | |
1037 | static const char *struct_convention = default_struct_convention; | |
1038 | ||
1039 | static int | |
1040 | i386_use_struct_convention (int gcc_p, struct type *type) | |
1041 | { | |
1042 | enum struct_return struct_return; | |
1043 | ||
1044 | if (struct_convention == default_struct_convention) | |
1045 | struct_return = gdbarch_tdep (current_gdbarch)->struct_return; | |
1046 | else if (struct_convention == pcc_struct_convention) | |
1047 | struct_return = pcc_struct_return; | |
1048 | else | |
1049 | struct_return = reg_struct_return; | |
1050 | ||
1051 | return generic_use_struct_convention (struct_return == reg_struct_return, | |
1052 | type); | |
1053 | } | |
1054 | \f | |
1055 | ||
d7a0d72c MK |
1056 | /* Return the GDB type object for the "standard" data type of data in |
1057 | register REGNUM. Perhaps %esi and %edi should go here, but | |
1058 | potentially they could be used for things other than address. */ | |
1059 | ||
1060 | struct type * | |
1061 | i386_register_virtual_type (int regnum) | |
1062 | { | |
1063 | if (regnum == PC_REGNUM || regnum == FP_REGNUM || regnum == SP_REGNUM) | |
1064 | return lookup_pointer_type (builtin_type_void); | |
1065 | ||
1066 | if (IS_FP_REGNUM (regnum)) | |
c6ba6f0d | 1067 | return builtin_type_i387_ext; |
d7a0d72c MK |
1068 | |
1069 | if (IS_SSE_REGNUM (regnum)) | |
3139facc | 1070 | return builtin_type_vec128i; |
d7a0d72c MK |
1071 | |
1072 | return builtin_type_int; | |
1073 | } | |
1074 | ||
1075 | /* Return true iff register REGNUM's virtual format is different from | |
1076 | its raw format. Note that this definition assumes that the host | |
1077 | supports IEEE 32-bit floats, since it doesn't say that SSE | |
1078 | registers need conversion. Even if we can't find a counterexample, | |
1079 | this is still sloppy. */ | |
1080 | ||
1081 | int | |
1082 | i386_register_convertible (int regnum) | |
1083 | { | |
1084 | return IS_FP_REGNUM (regnum); | |
1085 | } | |
1086 | ||
ac27f131 | 1087 | /* Convert data from raw format for register REGNUM in buffer FROM to |
3d261580 | 1088 | virtual format with type TYPE in buffer TO. */ |
ac27f131 MK |
1089 | |
1090 | void | |
1091 | i386_register_convert_to_virtual (int regnum, struct type *type, | |
1092 | char *from, char *to) | |
1093 | { | |
c6ba6f0d | 1094 | gdb_assert (IS_FP_REGNUM (regnum)); |
3d261580 MK |
1095 | |
1096 | /* We only support floating-point values. */ | |
8d7f6b4a MK |
1097 | if (TYPE_CODE (type) != TYPE_CODE_FLT) |
1098 | { | |
1099 | warning ("Cannot convert floating-point register value " | |
1100 | "to non-floating-point type."); | |
1101 | memset (to, 0, TYPE_LENGTH (type)); | |
1102 | return; | |
1103 | } | |
3d261580 | 1104 | |
c6ba6f0d MK |
1105 | /* Convert to TYPE. This should be a no-op if TYPE is equivalent to |
1106 | the extended floating-point format used by the FPU. */ | |
1107 | convert_typed_floating (from, builtin_type_i387_ext, to, type); | |
ac27f131 MK |
1108 | } |
1109 | ||
1110 | /* Convert data from virtual format with type TYPE in buffer FROM to | |
3d261580 | 1111 | raw format for register REGNUM in buffer TO. */ |
ac27f131 MK |
1112 | |
1113 | void | |
1114 | i386_register_convert_to_raw (struct type *type, int regnum, | |
1115 | char *from, char *to) | |
1116 | { | |
c6ba6f0d MK |
1117 | gdb_assert (IS_FP_REGNUM (regnum)); |
1118 | ||
1119 | /* We only support floating-point values. */ | |
1120 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
1121 | { | |
1122 | warning ("Cannot convert non-floating-point type " | |
1123 | "to floating-point register value."); | |
1124 | memset (to, 0, TYPE_LENGTH (type)); | |
1125 | return; | |
1126 | } | |
3d261580 | 1127 | |
c6ba6f0d MK |
1128 | /* Convert from TYPE. This should be a no-op if TYPE is equivalent |
1129 | to the extended floating-point format used by the FPU. */ | |
1130 | convert_typed_floating (from, type, to, builtin_type_i387_ext); | |
ac27f131 | 1131 | } |
ac27f131 | 1132 | \f |
fc338970 | 1133 | |
c906108c | 1134 | #ifdef STATIC_TRANSFORM_NAME |
fc338970 MK |
1135 | /* SunPRO encodes the static variables. This is not related to C++ |
1136 | mangling, it is done for C too. */ | |
c906108c SS |
1137 | |
1138 | char * | |
fba45db2 | 1139 | sunpro_static_transform_name (char *name) |
c906108c SS |
1140 | { |
1141 | char *p; | |
1142 | if (IS_STATIC_TRANSFORM_NAME (name)) | |
1143 | { | |
fc338970 MK |
1144 | /* For file-local statics there will be a period, a bunch of |
1145 | junk (the contents of which match a string given in the | |
c5aa993b JM |
1146 | N_OPT), a period and the name. For function-local statics |
1147 | there will be a bunch of junk (which seems to change the | |
1148 | second character from 'A' to 'B'), a period, the name of the | |
1149 | function, and the name. So just skip everything before the | |
1150 | last period. */ | |
c906108c SS |
1151 | p = strrchr (name, '.'); |
1152 | if (p != NULL) | |
1153 | name = p + 1; | |
1154 | } | |
1155 | return name; | |
1156 | } | |
1157 | #endif /* STATIC_TRANSFORM_NAME */ | |
fc338970 | 1158 | \f |
c906108c | 1159 | |
fc338970 | 1160 | /* Stuff for WIN32 PE style DLL's but is pretty generic really. */ |
c906108c SS |
1161 | |
1162 | CORE_ADDR | |
fba45db2 | 1163 | skip_trampoline_code (CORE_ADDR pc, char *name) |
c906108c | 1164 | { |
fc338970 | 1165 | if (pc && read_memory_unsigned_integer (pc, 2) == 0x25ff) /* jmp *(dest) */ |
c906108c | 1166 | { |
c5aa993b | 1167 | unsigned long indirect = read_memory_unsigned_integer (pc + 2, 4); |
c906108c | 1168 | struct minimal_symbol *indsym = |
fc338970 | 1169 | indirect ? lookup_minimal_symbol_by_pc (indirect) : 0; |
c5aa993b | 1170 | char *symname = indsym ? SYMBOL_NAME (indsym) : 0; |
c906108c | 1171 | |
c5aa993b | 1172 | if (symname) |
c906108c | 1173 | { |
c5aa993b JM |
1174 | if (strncmp (symname, "__imp_", 6) == 0 |
1175 | || strncmp (symname, "_imp_", 5) == 0) | |
c906108c SS |
1176 | return name ? 1 : read_memory_unsigned_integer (indirect, 4); |
1177 | } | |
1178 | } | |
fc338970 | 1179 | return 0; /* Not a trampoline. */ |
c906108c | 1180 | } |
fc338970 MK |
1181 | \f |
1182 | ||
8201327c MK |
1183 | /* Return non-zero if PC and NAME show that we are in a signal |
1184 | trampoline. */ | |
1185 | ||
1186 | static int | |
1187 | i386_pc_in_sigtramp (CORE_ADDR pc, char *name) | |
1188 | { | |
1189 | return (name && strcmp ("_sigtramp", name) == 0); | |
1190 | } | |
1191 | \f | |
1192 | ||
fc338970 MK |
1193 | /* We have two flavours of disassembly. The machinery on this page |
1194 | deals with switching between those. */ | |
c906108c SS |
1195 | |
1196 | static int | |
fba45db2 | 1197 | gdb_print_insn_i386 (bfd_vma memaddr, disassemble_info *info) |
c906108c SS |
1198 | { |
1199 | if (disassembly_flavor == att_flavor) | |
1200 | return print_insn_i386_att (memaddr, info); | |
1201 | else if (disassembly_flavor == intel_flavor) | |
1202 | return print_insn_i386_intel (memaddr, info); | |
fc338970 MK |
1203 | /* Never reached -- disassembly_flavour is always either att_flavor |
1204 | or intel_flavor. */ | |
e1e9e218 | 1205 | internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
7a292a7a | 1206 | } |
fc338970 | 1207 | \f |
3ce1502b | 1208 | |
8201327c MK |
1209 | /* There are a few i386 architecture variants that differ only |
1210 | slightly from the generic i386 target. For now, we don't give them | |
1211 | their own source file, but include them here. As a consequence, | |
1212 | they'll always be included. */ | |
3ce1502b | 1213 | |
8201327c | 1214 | /* System V Release 4 (SVR4). */ |
3ce1502b | 1215 | |
8201327c MK |
1216 | static int |
1217 | i386_svr4_pc_in_sigtramp (CORE_ADDR pc, char *name) | |
d2a7c97a | 1218 | { |
8201327c MK |
1219 | return (name && (strcmp ("_sigreturn", name) == 0 |
1220 | || strcmp ("_sigacthandler", name) == 0 | |
1221 | || strcmp ("sigvechandler", name) == 0)); | |
1222 | } | |
d2a7c97a | 1223 | |
8201327c MK |
1224 | /* Get saved user PC for sigtramp from the pushed ucontext on the |
1225 | stack for all three variants of SVR4 sigtramps. */ | |
3ce1502b | 1226 | |
8201327c MK |
1227 | CORE_ADDR |
1228 | i386_svr4_sigtramp_saved_pc (struct frame_info *frame) | |
1229 | { | |
1230 | CORE_ADDR saved_pc_offset = 4; | |
1231 | char *name = NULL; | |
1232 | ||
1233 | find_pc_partial_function (frame->pc, &name, NULL, NULL); | |
1234 | if (name) | |
d2a7c97a | 1235 | { |
8201327c MK |
1236 | if (strcmp (name, "_sigreturn") == 0) |
1237 | saved_pc_offset = 132 + 14 * 4; | |
1238 | else if (strcmp (name, "_sigacthandler") == 0) | |
1239 | saved_pc_offset = 80 + 14 * 4; | |
1240 | else if (strcmp (name, "sigvechandler") == 0) | |
1241 | saved_pc_offset = 120 + 14 * 4; | |
1242 | } | |
3ce1502b | 1243 | |
8201327c MK |
1244 | if (frame->next) |
1245 | return read_memory_integer (frame->next->frame + saved_pc_offset, 4); | |
1246 | return read_memory_integer (read_register (SP_REGNUM) + saved_pc_offset, 4); | |
1247 | } | |
1248 | \f | |
3ce1502b | 1249 | |
8201327c | 1250 | /* DJGPP. */ |
d2a7c97a | 1251 | |
8201327c MK |
1252 | static int |
1253 | i386_go32_pc_in_sigtramp (CORE_ADDR pc, char *name) | |
1254 | { | |
1255 | /* DJGPP doesn't have any special frames for signal handlers. */ | |
1256 | return 0; | |
1257 | } | |
1258 | \f | |
d2a7c97a | 1259 | |
8201327c | 1260 | /* Generic ELF. */ |
d2a7c97a | 1261 | |
8201327c MK |
1262 | void |
1263 | i386_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1264 | { | |
1265 | /* We typically use stabs-in-ELF with the DWARF register numbering. */ | |
1266 | set_gdbarch_stab_reg_to_regnum (gdbarch, i386_dwarf_reg_to_regnum); | |
1267 | } | |
3ce1502b | 1268 | |
8201327c | 1269 | /* System V Release 4 (SVR4). */ |
3ce1502b | 1270 | |
8201327c MK |
1271 | void |
1272 | i386_svr4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1273 | { | |
1274 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3ce1502b | 1275 | |
8201327c MK |
1276 | /* System V Release 4 uses ELF. */ |
1277 | i386_elf_init_abi (info, gdbarch); | |
3ce1502b | 1278 | |
8201327c MK |
1279 | /* FIXME: kettenis/20020511: Why do we override this function here? */ |
1280 | set_gdbarch_frame_chain_valid (gdbarch, func_frame_chain_valid); | |
3ce1502b | 1281 | |
8201327c MK |
1282 | set_gdbarch_pc_in_sigtramp (gdbarch, i386_svr4_pc_in_sigtramp); |
1283 | tdep->sigtramp_saved_pc = i386_svr4_sigtramp_saved_pc; | |
3ce1502b | 1284 | |
8201327c | 1285 | tdep->jb_pc_offset = 20; |
3ce1502b MK |
1286 | } |
1287 | ||
8201327c | 1288 | /* DJGPP. */ |
3ce1502b | 1289 | |
8201327c MK |
1290 | void |
1291 | i386_go32_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
3ce1502b | 1292 | { |
8201327c | 1293 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
3ce1502b | 1294 | |
8201327c | 1295 | set_gdbarch_pc_in_sigtramp (gdbarch, i386_go32_pc_in_sigtramp); |
3ce1502b | 1296 | |
8201327c | 1297 | tdep->jb_pc_offset = 36; |
3ce1502b MK |
1298 | } |
1299 | ||
8201327c | 1300 | /* NetWare. */ |
3ce1502b MK |
1301 | |
1302 | void | |
8201327c | 1303 | i386_nw_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
3ce1502b | 1304 | { |
8201327c | 1305 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
3ce1502b | 1306 | |
8201327c MK |
1307 | /* FIXME: kettenis/20020511: Why do we override this function here? */ |
1308 | set_gdbarch_frame_chain_valid (gdbarch, func_frame_chain_valid); | |
1309 | ||
1310 | tdep->jb_pc_offset = 24; | |
d2a7c97a | 1311 | } |
8201327c | 1312 | \f |
2acceee2 | 1313 | |
a62cc96e AC |
1314 | struct gdbarch * |
1315 | i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
1316 | { | |
cd3c07fc | 1317 | struct gdbarch_tdep *tdep; |
a62cc96e | 1318 | struct gdbarch *gdbarch; |
8201327c | 1319 | enum gdb_osabi osabi = GDB_OSABI_UNKNOWN; |
a62cc96e | 1320 | |
8201327c | 1321 | /* Try to determine the OS ABI of the object we're loading. */ |
3ce1502b | 1322 | if (info.abfd != NULL) |
8201327c | 1323 | osabi = gdbarch_lookup_osabi (info.abfd); |
d2a7c97a | 1324 | |
3ce1502b | 1325 | /* Find a candidate among extant architectures. */ |
d2a7c97a MK |
1326 | for (arches = gdbarch_list_lookup_by_info (arches, &info); |
1327 | arches != NULL; | |
1328 | arches = gdbarch_list_lookup_by_info (arches->next, &info)) | |
1329 | { | |
8201327c | 1330 | /* Make sure the OS ABI selection matches. */ |
65d6d66a | 1331 | tdep = gdbarch_tdep (arches->gdbarch); |
8201327c | 1332 | if (tdep && tdep->osabi == osabi) |
65d6d66a | 1333 | return arches->gdbarch; |
d2a7c97a | 1334 | } |
a62cc96e AC |
1335 | |
1336 | /* Allocate space for the new architecture. */ | |
1337 | tdep = XMALLOC (struct gdbarch_tdep); | |
1338 | gdbarch = gdbarch_alloc (&info, tdep); | |
1339 | ||
8201327c MK |
1340 | tdep->osabi = osabi; |
1341 | ||
1342 | /* The i386 default settings don't include the SSE registers. | |
1343 | FIXME: kettenis/20020509: They do include the FPU registers for | |
1344 | now, which is not quite right. */ | |
1345 | tdep->num_xmm_regs = 0; | |
d2a7c97a | 1346 | |
8201327c MK |
1347 | tdep->jb_pc_offset = -1; |
1348 | tdep->struct_return = pcc_struct_return; | |
1349 | tdep->sigtramp_saved_pc = NULL; | |
1350 | tdep->sigtramp_start = 0; | |
1351 | tdep->sigtramp_end = 0; | |
1352 | tdep->sc_pc_offset = -1; | |
1353 | ||
896fb97d MK |
1354 | /* The format used for `long double' on almost all i386 targets is |
1355 | the i387 extended floating-point format. In fact, of all targets | |
1356 | in the GCC 2.95 tree, only OSF/1 does it different, and insists | |
1357 | on having a `long double' that's not `long' at all. */ | |
1358 | set_gdbarch_long_double_format (gdbarch, &floatformat_i387_ext); | |
1359 | ||
1360 | /* Although the i386 extended floating-point has only 80 significant | |
1361 | bits, a `long double' actually takes up 96, probably to enforce | |
1362 | alignment. */ | |
1363 | set_gdbarch_long_double_bit (gdbarch, 96); | |
1364 | ||
8201327c | 1365 | set_gdbarch_get_longjmp_target (gdbarch, i386_get_longjmp_target); |
96297dab | 1366 | |
a62cc96e AC |
1367 | set_gdbarch_use_generic_dummy_frames (gdbarch, 0); |
1368 | ||
1369 | /* Call dummy code. */ | |
1370 | set_gdbarch_call_dummy_location (gdbarch, ON_STACK); | |
1371 | set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 5); | |
1372 | set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1); | |
1373 | set_gdbarch_call_dummy_p (gdbarch, 1); | |
1374 | set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); | |
1375 | ||
1376 | set_gdbarch_get_saved_register (gdbarch, generic_get_saved_register); | |
1377 | set_gdbarch_push_arguments (gdbarch, i386_push_arguments); | |
1378 | ||
1379 | set_gdbarch_pc_in_call_dummy (gdbarch, pc_in_call_dummy_on_stack); | |
1380 | ||
8201327c MK |
1381 | set_gdbarch_use_struct_convention (gdbarch, i386_use_struct_convention); |
1382 | ||
1383 | /* The following redefines make backtracing through sigtramp work. | |
1384 | They manufacture a fake sigtramp frame and obtain the saved pc in | |
1385 | sigtramp from the sigcontext structure which is pushed by the | |
1386 | kernel on the user stack, along with a pointer to it. */ | |
1387 | ||
1388 | set_gdbarch_frame_chain (gdbarch, i386_frame_chain); | |
a62cc96e | 1389 | set_gdbarch_frame_chain_valid (gdbarch, file_frame_chain_valid); |
8201327c MK |
1390 | set_gdbarch_frame_saved_pc (gdbarch, i386_frame_saved_pc); |
1391 | set_gdbarch_saved_pc_after_call (gdbarch, i386_saved_pc_after_call); | |
1392 | set_gdbarch_pc_in_sigtramp (gdbarch, i386_pc_in_sigtramp); | |
1393 | ||
1394 | /* NOTE: tm-i386aix.h, tm-i386bsd.h, tm-i386os9k.h, tm-ptx.h, | |
1395 | tm-symmetry.h currently override this. Sigh. */ | |
1396 | set_gdbarch_num_regs (gdbarch, I386_NUM_GREGS + I386_NUM_FREGS); | |
1397 | ||
1398 | /* Use the "default" register numbering scheme for stabs and COFF. */ | |
1399 | set_gdbarch_stab_reg_to_regnum (gdbarch, i386_stab_reg_to_regnum); | |
1400 | set_gdbarch_sdb_reg_to_regnum (gdbarch, i386_stab_reg_to_regnum); | |
1401 | ||
1402 | /* Use the DWARF register numbering scheme for DWARF and DWARF 2. */ | |
1403 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, i386_dwarf_reg_to_regnum); | |
1404 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, i386_dwarf_reg_to_regnum); | |
a62cc96e | 1405 | |
8201327c MK |
1406 | /* We don't define ECOFF_REG_TO_REGNUM, since ECOFF doesn't seem to |
1407 | be in use on any of the supported i386 targets. */ | |
1408 | ||
1409 | set_gdbarch_register_bytes (gdbarch, I386_SIZEOF_GREGS + I386_SIZEOF_FREGS); | |
1410 | set_gdbarch_register_name (gdbarch, i386_register_name); | |
1411 | set_gdbarch_register_byte (gdbarch, i386_register_byte); | |
1412 | set_gdbarch_register_raw_size (gdbarch, i386_register_raw_size); | |
bd1ef5d2 | 1413 | |
3ce1502b | 1414 | /* Hook in ABI-specific overrides, if they have been registered. */ |
8201327c | 1415 | gdbarch_init_osabi (info, gdbarch, osabi); |
3ce1502b | 1416 | |
a62cc96e AC |
1417 | return gdbarch; |
1418 | } | |
1419 | ||
8201327c MK |
1420 | static enum gdb_osabi |
1421 | i386_coff_osabi_sniffer (bfd *abfd) | |
1422 | { | |
1423 | if (strcmp (bfd_get_target (abfd), "coff-go32-exe") == 0) | |
1424 | return GDB_OSABI_GO32; | |
1425 | ||
1426 | return GDB_OSABI_UNKNOWN; | |
1427 | } | |
1428 | ||
1429 | static enum gdb_osabi | |
1430 | i386_nlm_osabi_sniffer (bfd *abfd) | |
1431 | { | |
1432 | return GDB_OSABI_NETWARE; | |
1433 | } | |
1434 | \f | |
1435 | ||
28e9e0f0 MK |
1436 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1437 | void _initialize_i386_tdep (void); | |
1438 | ||
c906108c | 1439 | void |
fba45db2 | 1440 | _initialize_i386_tdep (void) |
c906108c | 1441 | { |
a62cc96e AC |
1442 | register_gdbarch_init (bfd_arch_i386, i386_gdbarch_init); |
1443 | ||
917317f4 JM |
1444 | /* Initialize the table saying where each register starts in the |
1445 | register file. */ | |
1446 | { | |
1447 | int i, offset; | |
1448 | ||
1449 | offset = 0; | |
1450 | for (i = 0; i < MAX_NUM_REGS; i++) | |
1451 | { | |
1a11ba71 MK |
1452 | i386_register_offset[i] = offset; |
1453 | offset += i386_register_size[i]; | |
917317f4 JM |
1454 | } |
1455 | } | |
1456 | ||
c906108c SS |
1457 | tm_print_insn = gdb_print_insn_i386; |
1458 | tm_print_insn_info.mach = bfd_lookup_arch (bfd_arch_i386, 0)->mach; | |
1459 | ||
fc338970 | 1460 | /* Add the variable that controls the disassembly flavor. */ |
917317f4 JM |
1461 | { |
1462 | struct cmd_list_element *new_cmd; | |
7a292a7a | 1463 | |
917317f4 JM |
1464 | new_cmd = add_set_enum_cmd ("disassembly-flavor", no_class, |
1465 | valid_flavors, | |
1ed2a135 | 1466 | &disassembly_flavor, |
fc338970 MK |
1467 | "\ |
1468 | Set the disassembly flavor, the valid values are \"att\" and \"intel\", \ | |
c906108c | 1469 | and the default value is \"att\".", |
917317f4 | 1470 | &setlist); |
917317f4 JM |
1471 | add_show_from_set (new_cmd, &showlist); |
1472 | } | |
8201327c MK |
1473 | |
1474 | /* Add the variable that controls the convention for returning | |
1475 | structs. */ | |
1476 | { | |
1477 | struct cmd_list_element *new_cmd; | |
1478 | ||
1479 | new_cmd = add_set_enum_cmd ("struct-convention", no_class, | |
1480 | valid_conventions, | |
1481 | &struct_convention, "\ | |
1482 | Set the convention for returning small structs, valid values \ | |
1483 | are \"default\", \"pcc\" and \"reg\", and the default value is \"default\".", | |
1484 | &setlist); | |
1485 | add_show_from_set (new_cmd, &showlist); | |
1486 | } | |
1487 | ||
1488 | gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour, | |
1489 | i386_coff_osabi_sniffer); | |
1490 | gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_nlm_flavour, | |
1491 | i386_nlm_osabi_sniffer); | |
1492 | ||
1493 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_SVR4, | |
1494 | i386_svr4_init_abi); | |
1495 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_GO32, | |
1496 | i386_go32_init_abi); | |
1497 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETWARE, | |
1498 | i386_nw_init_abi); | |
c906108c | 1499 | } |