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" | |
dfe01d39 | 28 | #include "objfiles.h" |
c906108c SS |
29 | #include "target.h" |
30 | #include "floatformat.h" | |
c0d1d883 | 31 | #include "symfile.h" |
c906108c SS |
32 | #include "symtab.h" |
33 | #include "gdbcmd.h" | |
34 | #include "command.h" | |
b4a20239 | 35 | #include "arch-utils.h" |
4e052eda | 36 | #include "regcache.h" |
d16aafd8 | 37 | #include "doublest.h" |
fd0407d6 | 38 | #include "value.h" |
3d261580 MK |
39 | #include "gdb_assert.h" |
40 | ||
d2a7c97a | 41 | #include "i386-tdep.h" |
61113f8b | 42 | #include "i387-tdep.h" |
d2a7c97a | 43 | |
fc633446 MK |
44 | /* Names of the registers. The first 10 registers match the register |
45 | numbering scheme used by GCC for stabs and DWARF. */ | |
46 | static char *i386_register_names[] = | |
47 | { | |
48 | "eax", "ecx", "edx", "ebx", | |
49 | "esp", "ebp", "esi", "edi", | |
50 | "eip", "eflags", "cs", "ss", | |
51 | "ds", "es", "fs", "gs", | |
52 | "st0", "st1", "st2", "st3", | |
53 | "st4", "st5", "st6", "st7", | |
54 | "fctrl", "fstat", "ftag", "fiseg", | |
55 | "fioff", "foseg", "fooff", "fop", | |
56 | "xmm0", "xmm1", "xmm2", "xmm3", | |
57 | "xmm4", "xmm5", "xmm6", "xmm7", | |
58 | "mxcsr" | |
59 | }; | |
60 | ||
28fc6740 AC |
61 | /* MMX registers. */ |
62 | ||
63 | static char *i386_mmx_names[] = | |
64 | { | |
65 | "mm0", "mm1", "mm2", "mm3", | |
66 | "mm4", "mm5", "mm6", "mm7" | |
67 | }; | |
68 | static const int mmx_num_regs = (sizeof (i386_mmx_names) | |
69 | / sizeof (i386_mmx_names[0])); | |
70 | #define MM0_REGNUM (NUM_REGS) | |
71 | ||
72 | static int | |
73 | mmx_regnum_p (int reg) | |
74 | { | |
75 | return (reg >= MM0_REGNUM && reg < MM0_REGNUM + mmx_num_regs); | |
76 | } | |
77 | ||
fc633446 MK |
78 | /* Return the name of register REG. */ |
79 | ||
fa88f677 | 80 | const char * |
fc633446 MK |
81 | i386_register_name (int reg) |
82 | { | |
83 | if (reg < 0) | |
84 | return NULL; | |
28fc6740 AC |
85 | if (mmx_regnum_p (reg)) |
86 | return i386_mmx_names[reg - MM0_REGNUM]; | |
fc633446 MK |
87 | if (reg >= sizeof (i386_register_names) / sizeof (*i386_register_names)) |
88 | return NULL; | |
89 | ||
90 | return i386_register_names[reg]; | |
91 | } | |
92 | ||
85540d8c MK |
93 | /* Convert stabs register number REG to the appropriate register |
94 | number used by GDB. */ | |
95 | ||
8201327c | 96 | static int |
85540d8c MK |
97 | i386_stab_reg_to_regnum (int reg) |
98 | { | |
99 | /* This implements what GCC calls the "default" register map. */ | |
100 | if (reg >= 0 && reg <= 7) | |
101 | { | |
102 | /* General registers. */ | |
103 | return reg; | |
104 | } | |
105 | else if (reg >= 12 && reg <= 19) | |
106 | { | |
107 | /* Floating-point registers. */ | |
108 | return reg - 12 + FP0_REGNUM; | |
109 | } | |
110 | else if (reg >= 21 && reg <= 28) | |
111 | { | |
112 | /* SSE registers. */ | |
113 | return reg - 21 + XMM0_REGNUM; | |
114 | } | |
115 | else if (reg >= 29 && reg <= 36) | |
116 | { | |
117 | /* MMX registers. */ | |
7d12f766 | 118 | return reg - 29 + MM0_REGNUM; |
85540d8c MK |
119 | } |
120 | ||
121 | /* This will hopefully provoke a warning. */ | |
122 | return NUM_REGS + NUM_PSEUDO_REGS; | |
123 | } | |
124 | ||
8201327c | 125 | /* Convert DWARF register number REG to the appropriate register |
85540d8c MK |
126 | number used by GDB. */ |
127 | ||
8201327c | 128 | static int |
85540d8c MK |
129 | i386_dwarf_reg_to_regnum (int reg) |
130 | { | |
131 | /* The DWARF register numbering includes %eip and %eflags, and | |
132 | numbers the floating point registers differently. */ | |
133 | if (reg >= 0 && reg <= 9) | |
134 | { | |
135 | /* General registers. */ | |
136 | return reg; | |
137 | } | |
138 | else if (reg >= 11 && reg <= 18) | |
139 | { | |
140 | /* Floating-point registers. */ | |
141 | return reg - 11 + FP0_REGNUM; | |
142 | } | |
143 | else if (reg >= 21) | |
144 | { | |
145 | /* The SSE and MMX registers have identical numbers as in stabs. */ | |
146 | return i386_stab_reg_to_regnum (reg); | |
147 | } | |
148 | ||
149 | /* This will hopefully provoke a warning. */ | |
150 | return NUM_REGS + NUM_PSEUDO_REGS; | |
151 | } | |
fc338970 | 152 | \f |
917317f4 | 153 | |
fc338970 MK |
154 | /* This is the variable that is set with "set disassembly-flavor", and |
155 | its legitimate values. */ | |
53904c9e AC |
156 | static const char att_flavor[] = "att"; |
157 | static const char intel_flavor[] = "intel"; | |
158 | static const char *valid_flavors[] = | |
c5aa993b | 159 | { |
c906108c SS |
160 | att_flavor, |
161 | intel_flavor, | |
162 | NULL | |
163 | }; | |
53904c9e | 164 | static const char *disassembly_flavor = att_flavor; |
c906108c | 165 | |
fc338970 MK |
166 | /* Stdio style buffering was used to minimize calls to ptrace, but |
167 | this buffering did not take into account that the code section | |
168 | being accessed may not be an even number of buffers long (even if | |
169 | the buffer is only sizeof(int) long). In cases where the code | |
170 | section size happened to be a non-integral number of buffers long, | |
171 | attempting to read the last buffer would fail. Simply using | |
172 | target_read_memory and ignoring errors, rather than read_memory, is | |
173 | not the correct solution, since legitimate access errors would then | |
174 | be totally ignored. To properly handle this situation and continue | |
175 | to use buffering would require that this code be able to determine | |
176 | the minimum code section size granularity (not the alignment of the | |
177 | section itself, since the actual failing case that pointed out this | |
178 | problem had a section alignment of 4 but was not a multiple of 4 | |
179 | bytes long), on a target by target basis, and then adjust it's | |
180 | buffer size accordingly. This is messy, but potentially feasible. | |
181 | It probably needs the bfd library's help and support. For now, the | |
182 | buffer size is set to 1. (FIXME -fnf) */ | |
183 | ||
184 | #define CODESTREAM_BUFSIZ 1 /* Was sizeof(int), see note above. */ | |
c906108c SS |
185 | static CORE_ADDR codestream_next_addr; |
186 | static CORE_ADDR codestream_addr; | |
187 | static unsigned char codestream_buf[CODESTREAM_BUFSIZ]; | |
188 | static int codestream_off; | |
189 | static int codestream_cnt; | |
190 | ||
191 | #define codestream_tell() (codestream_addr + codestream_off) | |
fc338970 MK |
192 | #define codestream_peek() \ |
193 | (codestream_cnt == 0 ? \ | |
194 | codestream_fill(1) : codestream_buf[codestream_off]) | |
195 | #define codestream_get() \ | |
196 | (codestream_cnt-- == 0 ? \ | |
197 | codestream_fill(0) : codestream_buf[codestream_off++]) | |
c906108c | 198 | |
c5aa993b | 199 | static unsigned char |
fba45db2 | 200 | codestream_fill (int peek_flag) |
c906108c SS |
201 | { |
202 | codestream_addr = codestream_next_addr; | |
203 | codestream_next_addr += CODESTREAM_BUFSIZ; | |
204 | codestream_off = 0; | |
205 | codestream_cnt = CODESTREAM_BUFSIZ; | |
206 | read_memory (codestream_addr, (char *) codestream_buf, CODESTREAM_BUFSIZ); | |
c5aa993b | 207 | |
c906108c | 208 | if (peek_flag) |
c5aa993b | 209 | return (codestream_peek ()); |
c906108c | 210 | else |
c5aa993b | 211 | return (codestream_get ()); |
c906108c SS |
212 | } |
213 | ||
214 | static void | |
fba45db2 | 215 | codestream_seek (CORE_ADDR place) |
c906108c SS |
216 | { |
217 | codestream_next_addr = place / CODESTREAM_BUFSIZ; | |
218 | codestream_next_addr *= CODESTREAM_BUFSIZ; | |
219 | codestream_cnt = 0; | |
220 | codestream_fill (1); | |
c5aa993b | 221 | while (codestream_tell () != place) |
c906108c SS |
222 | codestream_get (); |
223 | } | |
224 | ||
225 | static void | |
fba45db2 | 226 | codestream_read (unsigned char *buf, int count) |
c906108c SS |
227 | { |
228 | unsigned char *p; | |
229 | int i; | |
230 | p = buf; | |
231 | for (i = 0; i < count; i++) | |
232 | *p++ = codestream_get (); | |
233 | } | |
fc338970 | 234 | \f |
c906108c | 235 | |
fc338970 | 236 | /* If the next instruction is a jump, move to its target. */ |
c906108c SS |
237 | |
238 | static void | |
fba45db2 | 239 | i386_follow_jump (void) |
c906108c SS |
240 | { |
241 | unsigned char buf[4]; | |
242 | long delta; | |
243 | ||
244 | int data16; | |
245 | CORE_ADDR pos; | |
246 | ||
247 | pos = codestream_tell (); | |
248 | ||
249 | data16 = 0; | |
250 | if (codestream_peek () == 0x66) | |
251 | { | |
252 | codestream_get (); | |
253 | data16 = 1; | |
254 | } | |
255 | ||
256 | switch (codestream_get ()) | |
257 | { | |
258 | case 0xe9: | |
fc338970 | 259 | /* Relative jump: if data16 == 0, disp32, else disp16. */ |
c906108c SS |
260 | if (data16) |
261 | { | |
262 | codestream_read (buf, 2); | |
263 | delta = extract_signed_integer (buf, 2); | |
264 | ||
fc338970 MK |
265 | /* Include the size of the jmp instruction (including the |
266 | 0x66 prefix). */ | |
c5aa993b | 267 | pos += delta + 4; |
c906108c SS |
268 | } |
269 | else | |
270 | { | |
271 | codestream_read (buf, 4); | |
272 | delta = extract_signed_integer (buf, 4); | |
273 | ||
274 | pos += delta + 5; | |
275 | } | |
276 | break; | |
277 | case 0xeb: | |
fc338970 | 278 | /* Relative jump, disp8 (ignore data16). */ |
c906108c SS |
279 | codestream_read (buf, 1); |
280 | /* Sign-extend it. */ | |
281 | delta = extract_signed_integer (buf, 1); | |
282 | ||
283 | pos += delta + 2; | |
284 | break; | |
285 | } | |
286 | codestream_seek (pos); | |
287 | } | |
288 | ||
fc338970 MK |
289 | /* Find & return the amount a local space allocated, and advance the |
290 | codestream to the first register push (if any). | |
291 | ||
292 | If the entry sequence doesn't make sense, return -1, and leave | |
293 | codestream pointer at a random spot. */ | |
c906108c SS |
294 | |
295 | static long | |
fba45db2 | 296 | i386_get_frame_setup (CORE_ADDR pc) |
c906108c SS |
297 | { |
298 | unsigned char op; | |
299 | ||
300 | codestream_seek (pc); | |
301 | ||
302 | i386_follow_jump (); | |
303 | ||
304 | op = codestream_get (); | |
305 | ||
306 | if (op == 0x58) /* popl %eax */ | |
307 | { | |
fc338970 MK |
308 | /* This function must start with |
309 | ||
310 | popl %eax 0x58 | |
311 | xchgl %eax, (%esp) 0x87 0x04 0x24 | |
312 | or xchgl %eax, 0(%esp) 0x87 0x44 0x24 0x00 | |
313 | ||
314 | (the System V compiler puts out the second `xchg' | |
315 | instruction, and the assembler doesn't try to optimize it, so | |
316 | the 'sib' form gets generated). This sequence is used to get | |
317 | the address of the return buffer for a function that returns | |
318 | a structure. */ | |
c906108c SS |
319 | int pos; |
320 | unsigned char buf[4]; | |
fc338970 MK |
321 | static unsigned char proto1[3] = { 0x87, 0x04, 0x24 }; |
322 | static unsigned char proto2[4] = { 0x87, 0x44, 0x24, 0x00 }; | |
323 | ||
c906108c SS |
324 | pos = codestream_tell (); |
325 | codestream_read (buf, 4); | |
326 | if (memcmp (buf, proto1, 3) == 0) | |
327 | pos += 3; | |
328 | else if (memcmp (buf, proto2, 4) == 0) | |
329 | pos += 4; | |
330 | ||
331 | codestream_seek (pos); | |
fc338970 | 332 | op = codestream_get (); /* Update next opcode. */ |
c906108c SS |
333 | } |
334 | ||
335 | if (op == 0x68 || op == 0x6a) | |
336 | { | |
fc338970 MK |
337 | /* This function may start with |
338 | ||
339 | pushl constant | |
340 | call _probe | |
341 | addl $4, %esp | |
342 | ||
343 | followed by | |
344 | ||
345 | pushl %ebp | |
346 | ||
347 | etc. */ | |
c906108c SS |
348 | int pos; |
349 | unsigned char buf[8]; | |
350 | ||
fc338970 | 351 | /* Skip past the `pushl' instruction; it has either a one-byte |
c906108c SS |
352 | or a four-byte operand, depending on the opcode. */ |
353 | pos = codestream_tell (); | |
354 | if (op == 0x68) | |
355 | pos += 4; | |
356 | else | |
357 | pos += 1; | |
358 | codestream_seek (pos); | |
359 | ||
fc338970 MK |
360 | /* Read the following 8 bytes, which should be "call _probe" (6 |
361 | bytes) followed by "addl $4,%esp" (2 bytes). */ | |
c906108c SS |
362 | codestream_read (buf, sizeof (buf)); |
363 | if (buf[0] == 0xe8 && buf[6] == 0xc4 && buf[7] == 0x4) | |
364 | pos += sizeof (buf); | |
365 | codestream_seek (pos); | |
fc338970 | 366 | op = codestream_get (); /* Update next opcode. */ |
c906108c SS |
367 | } |
368 | ||
369 | if (op == 0x55) /* pushl %ebp */ | |
c5aa993b | 370 | { |
fc338970 | 371 | /* Check for "movl %esp, %ebp" -- can be written in two ways. */ |
c906108c SS |
372 | switch (codestream_get ()) |
373 | { | |
374 | case 0x8b: | |
375 | if (codestream_get () != 0xec) | |
fc338970 | 376 | return -1; |
c906108c SS |
377 | break; |
378 | case 0x89: | |
379 | if (codestream_get () != 0xe5) | |
fc338970 | 380 | return -1; |
c906108c SS |
381 | break; |
382 | default: | |
fc338970 | 383 | return -1; |
c906108c | 384 | } |
fc338970 MK |
385 | /* Check for stack adjustment |
386 | ||
387 | subl $XXX, %esp | |
388 | ||
389 | NOTE: You can't subtract a 16 bit immediate from a 32 bit | |
390 | reg, so we don't have to worry about a data16 prefix. */ | |
c906108c SS |
391 | op = codestream_peek (); |
392 | if (op == 0x83) | |
393 | { | |
fc338970 | 394 | /* `subl' with 8 bit immediate. */ |
c906108c SS |
395 | codestream_get (); |
396 | if (codestream_get () != 0xec) | |
fc338970 | 397 | /* Some instruction starting with 0x83 other than `subl'. */ |
c906108c SS |
398 | { |
399 | codestream_seek (codestream_tell () - 2); | |
400 | return 0; | |
401 | } | |
fc338970 MK |
402 | /* `subl' with signed byte immediate (though it wouldn't |
403 | make sense to be negative). */ | |
c5aa993b | 404 | return (codestream_get ()); |
c906108c SS |
405 | } |
406 | else if (op == 0x81) | |
407 | { | |
408 | char buf[4]; | |
fc338970 | 409 | /* Maybe it is `subl' with a 32 bit immedediate. */ |
c5aa993b | 410 | codestream_get (); |
c906108c | 411 | if (codestream_get () != 0xec) |
fc338970 | 412 | /* Some instruction starting with 0x81 other than `subl'. */ |
c906108c SS |
413 | { |
414 | codestream_seek (codestream_tell () - 2); | |
415 | return 0; | |
416 | } | |
fc338970 | 417 | /* It is `subl' with a 32 bit immediate. */ |
c5aa993b | 418 | codestream_read ((unsigned char *) buf, 4); |
c906108c SS |
419 | return extract_signed_integer (buf, 4); |
420 | } | |
421 | else | |
422 | { | |
fc338970 | 423 | return 0; |
c906108c SS |
424 | } |
425 | } | |
426 | else if (op == 0xc8) | |
427 | { | |
428 | char buf[2]; | |
fc338970 | 429 | /* `enter' with 16 bit unsigned immediate. */ |
c5aa993b | 430 | codestream_read ((unsigned char *) buf, 2); |
fc338970 | 431 | codestream_get (); /* Flush final byte of enter instruction. */ |
c906108c SS |
432 | return extract_unsigned_integer (buf, 2); |
433 | } | |
434 | return (-1); | |
435 | } | |
436 | ||
6bff26de MK |
437 | /* Signal trampolines don't have a meaningful frame. The frame |
438 | pointer value we use is actually the frame pointer of the calling | |
439 | frame -- that is, the frame which was in progress when the signal | |
440 | trampoline was entered. GDB mostly treats this frame pointer value | |
441 | as a magic cookie. We detect the case of a signal trampoline by | |
442 | looking at the SIGNAL_HANDLER_CALLER field, which is set based on | |
443 | PC_IN_SIGTRAMP. | |
444 | ||
445 | When a signal trampoline is invoked from a frameless function, we | |
446 | essentially have two frameless functions in a row. In this case, | |
447 | we use the same magic cookie for three frames in a row. We detect | |
448 | this case by seeing whether the next frame has | |
449 | SIGNAL_HANDLER_CALLER set, and, if it does, checking whether the | |
450 | current frame is actually frameless. In this case, we need to get | |
451 | the PC by looking at the SP register value stored in the signal | |
452 | context. | |
453 | ||
454 | This should work in most cases except in horrible situations where | |
455 | a signal occurs just as we enter a function but before the frame | |
c0d1d883 MK |
456 | has been set up. Incidentally, that's just what happens when we |
457 | call a function from GDB with a signal pending (there's a test in | |
458 | the testsuite that makes this happen). Therefore we pretend that | |
459 | we have a frameless function if we're stopped at the start of a | |
460 | function. */ | |
6bff26de MK |
461 | |
462 | /* Return non-zero if we're dealing with a frameless signal, that is, | |
463 | a signal trampoline invoked from a frameless function. */ | |
464 | ||
465 | static int | |
466 | i386_frameless_signal_p (struct frame_info *frame) | |
467 | { | |
c0d1d883 MK |
468 | return (frame->next && frame->next->signal_handler_caller |
469 | && (frameless_look_for_prologue (frame) | |
470 | || frame->pc == get_pc_function_start (frame->pc))); | |
6bff26de MK |
471 | } |
472 | ||
c833a37e MK |
473 | /* Return the chain-pointer for FRAME. In the case of the i386, the |
474 | frame's nominal address is the address of a 4-byte word containing | |
475 | the calling frame's address. */ | |
476 | ||
8201327c | 477 | static CORE_ADDR |
c833a37e MK |
478 | i386_frame_chain (struct frame_info *frame) |
479 | { | |
c0d1d883 MK |
480 | if (PC_IN_CALL_DUMMY (frame->pc, 0, 0)) |
481 | return frame->frame; | |
482 | ||
6bff26de MK |
483 | if (frame->signal_handler_caller |
484 | || i386_frameless_signal_p (frame)) | |
c833a37e MK |
485 | return frame->frame; |
486 | ||
487 | if (! inside_entry_file (frame->pc)) | |
488 | return read_memory_unsigned_integer (frame->frame, 4); | |
489 | ||
490 | return 0; | |
491 | } | |
492 | ||
539ffe0b MK |
493 | /* Determine whether the function invocation represented by FRAME does |
494 | not have a from on the stack associated with it. If it does not, | |
495 | return non-zero, otherwise return zero. */ | |
496 | ||
3a1e71e3 | 497 | static int |
539ffe0b MK |
498 | i386_frameless_function_invocation (struct frame_info *frame) |
499 | { | |
500 | if (frame->signal_handler_caller) | |
501 | return 0; | |
502 | ||
503 | return frameless_look_for_prologue (frame); | |
504 | } | |
505 | ||
21d0e8a4 MK |
506 | /* Assuming FRAME is for a sigtramp routine, return the saved program |
507 | counter. */ | |
508 | ||
509 | static CORE_ADDR | |
510 | i386_sigtramp_saved_pc (struct frame_info *frame) | |
511 | { | |
512 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
513 | CORE_ADDR addr; | |
514 | ||
515 | addr = tdep->sigcontext_addr (frame); | |
516 | return read_memory_unsigned_integer (addr + tdep->sc_pc_offset, 4); | |
517 | } | |
518 | ||
6bff26de MK |
519 | /* Assuming FRAME is for a sigtramp routine, return the saved stack |
520 | pointer. */ | |
521 | ||
522 | static CORE_ADDR | |
523 | i386_sigtramp_saved_sp (struct frame_info *frame) | |
524 | { | |
525 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
526 | CORE_ADDR addr; | |
527 | ||
528 | addr = tdep->sigcontext_addr (frame); | |
529 | return read_memory_unsigned_integer (addr + tdep->sc_sp_offset, 4); | |
530 | } | |
531 | ||
0d17c81d MK |
532 | /* Return the saved program counter for FRAME. */ |
533 | ||
8201327c | 534 | static CORE_ADDR |
0d17c81d MK |
535 | i386_frame_saved_pc (struct frame_info *frame) |
536 | { | |
c0d1d883 | 537 | if (PC_IN_CALL_DUMMY (frame->pc, 0, 0)) |
267bf4bb MK |
538 | { |
539 | ULONGEST pc; | |
540 | ||
541 | frame_unwind_unsigned_register (frame, PC_REGNUM, &pc); | |
542 | return pc; | |
543 | } | |
c0d1d883 | 544 | |
0d17c81d | 545 | if (frame->signal_handler_caller) |
21d0e8a4 | 546 | return i386_sigtramp_saved_pc (frame); |
0d17c81d | 547 | |
6bff26de MK |
548 | if (i386_frameless_signal_p (frame)) |
549 | { | |
550 | CORE_ADDR sp = i386_sigtramp_saved_sp (frame->next); | |
551 | return read_memory_unsigned_integer (sp, 4); | |
552 | } | |
553 | ||
8201327c | 554 | return read_memory_unsigned_integer (frame->frame + 4, 4); |
22797942 AC |
555 | } |
556 | ||
ed84f6c1 MK |
557 | /* Immediately after a function call, return the saved pc. */ |
558 | ||
8201327c | 559 | static CORE_ADDR |
ed84f6c1 MK |
560 | i386_saved_pc_after_call (struct frame_info *frame) |
561 | { | |
6bff26de MK |
562 | if (frame->signal_handler_caller) |
563 | return i386_sigtramp_saved_pc (frame); | |
564 | ||
ed84f6c1 MK |
565 | return read_memory_unsigned_integer (read_register (SP_REGNUM), 4); |
566 | } | |
567 | ||
c906108c SS |
568 | /* Return number of args passed to a frame. |
569 | Can return -1, meaning no way to tell. */ | |
570 | ||
3a1e71e3 | 571 | static int |
fba45db2 | 572 | i386_frame_num_args (struct frame_info *fi) |
c906108c SS |
573 | { |
574 | #if 1 | |
575 | return -1; | |
576 | #else | |
577 | /* This loses because not only might the compiler not be popping the | |
fc338970 MK |
578 | args right after the function call, it might be popping args from |
579 | both this call and a previous one, and we would say there are | |
580 | more args than there really are. */ | |
c906108c | 581 | |
c5aa993b JM |
582 | int retpc; |
583 | unsigned char op; | |
c906108c SS |
584 | struct frame_info *pfi; |
585 | ||
fc338970 | 586 | /* On the i386, the instruction following the call could be: |
c906108c SS |
587 | popl %ecx - one arg |
588 | addl $imm, %esp - imm/4 args; imm may be 8 or 32 bits | |
fc338970 | 589 | anything else - zero args. */ |
c906108c SS |
590 | |
591 | int frameless; | |
592 | ||
392a587b | 593 | frameless = FRAMELESS_FUNCTION_INVOCATION (fi); |
c906108c | 594 | if (frameless) |
fc338970 MK |
595 | /* In the absence of a frame pointer, GDB doesn't get correct |
596 | values for nameless arguments. Return -1, so it doesn't print | |
597 | any nameless arguments. */ | |
c906108c SS |
598 | return -1; |
599 | ||
c5aa993b | 600 | pfi = get_prev_frame (fi); |
c906108c SS |
601 | if (pfi == 0) |
602 | { | |
fc338970 MK |
603 | /* NOTE: This can happen if we are looking at the frame for |
604 | main, because FRAME_CHAIN_VALID won't let us go into start. | |
605 | If we have debugging symbols, that's not really a big deal; | |
606 | it just means it will only show as many arguments to main as | |
607 | are declared. */ | |
c906108c SS |
608 | return -1; |
609 | } | |
610 | else | |
611 | { | |
c5aa993b JM |
612 | retpc = pfi->pc; |
613 | op = read_memory_integer (retpc, 1); | |
fc338970 | 614 | if (op == 0x59) /* pop %ecx */ |
c5aa993b | 615 | return 1; |
c906108c SS |
616 | else if (op == 0x83) |
617 | { | |
c5aa993b JM |
618 | op = read_memory_integer (retpc + 1, 1); |
619 | if (op == 0xc4) | |
620 | /* addl $<signed imm 8 bits>, %esp */ | |
621 | return (read_memory_integer (retpc + 2, 1) & 0xff) / 4; | |
c906108c SS |
622 | else |
623 | return 0; | |
624 | } | |
fc338970 MK |
625 | else if (op == 0x81) /* `add' with 32 bit immediate. */ |
626 | { | |
c5aa993b JM |
627 | op = read_memory_integer (retpc + 1, 1); |
628 | if (op == 0xc4) | |
629 | /* addl $<imm 32>, %esp */ | |
630 | return read_memory_integer (retpc + 2, 4) / 4; | |
c906108c SS |
631 | else |
632 | return 0; | |
633 | } | |
634 | else | |
635 | { | |
636 | return 0; | |
637 | } | |
638 | } | |
639 | #endif | |
640 | } | |
641 | ||
fc338970 MK |
642 | /* Parse the first few instructions the function to see what registers |
643 | were stored. | |
644 | ||
645 | We handle these cases: | |
646 | ||
647 | The startup sequence can be at the start of the function, or the | |
648 | function can start with a branch to startup code at the end. | |
649 | ||
650 | %ebp can be set up with either the 'enter' instruction, or "pushl | |
651 | %ebp, movl %esp, %ebp" (`enter' is too slow to be useful, but was | |
652 | once used in the System V compiler). | |
653 | ||
654 | Local space is allocated just below the saved %ebp by either the | |
655 | 'enter' instruction, or by "subl $<size>, %esp". 'enter' has a 16 | |
656 | bit unsigned argument for space to allocate, and the 'addl' | |
657 | instruction could have either a signed byte, or 32 bit immediate. | |
658 | ||
659 | Next, the registers used by this function are pushed. With the | |
660 | System V compiler they will always be in the order: %edi, %esi, | |
661 | %ebx (and sometimes a harmless bug causes it to also save but not | |
662 | restore %eax); however, the code below is willing to see the pushes | |
663 | in any order, and will handle up to 8 of them. | |
664 | ||
665 | If the setup sequence is at the end of the function, then the next | |
666 | instruction will be a branch back to the start. */ | |
c906108c | 667 | |
3a1e71e3 | 668 | static void |
fba45db2 | 669 | i386_frame_init_saved_regs (struct frame_info *fip) |
c906108c SS |
670 | { |
671 | long locals = -1; | |
672 | unsigned char op; | |
fc338970 | 673 | CORE_ADDR addr; |
c906108c SS |
674 | CORE_ADDR pc; |
675 | int i; | |
c5aa993b | 676 | |
1211c4e4 AC |
677 | if (fip->saved_regs) |
678 | return; | |
679 | ||
680 | frame_saved_regs_zalloc (fip); | |
c5aa993b | 681 | |
c906108c SS |
682 | pc = get_pc_function_start (fip->pc); |
683 | if (pc != 0) | |
684 | locals = i386_get_frame_setup (pc); | |
c5aa993b JM |
685 | |
686 | if (locals >= 0) | |
c906108c | 687 | { |
fc338970 | 688 | addr = fip->frame - 4 - locals; |
c5aa993b | 689 | for (i = 0; i < 8; i++) |
c906108c SS |
690 | { |
691 | op = codestream_get (); | |
692 | if (op < 0x50 || op > 0x57) | |
693 | break; | |
694 | #ifdef I386_REGNO_TO_SYMMETRY | |
695 | /* Dynix uses different internal numbering. Ick. */ | |
fc338970 | 696 | fip->saved_regs[I386_REGNO_TO_SYMMETRY (op - 0x50)] = addr; |
c906108c | 697 | #else |
fc338970 | 698 | fip->saved_regs[op - 0x50] = addr; |
c906108c | 699 | #endif |
fc338970 | 700 | addr -= 4; |
c906108c SS |
701 | } |
702 | } | |
c5aa993b | 703 | |
1211c4e4 AC |
704 | fip->saved_regs[PC_REGNUM] = fip->frame + 4; |
705 | fip->saved_regs[FP_REGNUM] = fip->frame; | |
c906108c SS |
706 | } |
707 | ||
fc338970 | 708 | /* Return PC of first real instruction. */ |
c906108c | 709 | |
3a1e71e3 | 710 | static CORE_ADDR |
93924b6b | 711 | i386_skip_prologue (CORE_ADDR pc) |
c906108c SS |
712 | { |
713 | unsigned char op; | |
714 | int i; | |
c5aa993b | 715 | static unsigned char pic_pat[6] = |
fc338970 MK |
716 | { 0xe8, 0, 0, 0, 0, /* call 0x0 */ |
717 | 0x5b, /* popl %ebx */ | |
c5aa993b | 718 | }; |
c906108c | 719 | CORE_ADDR pos; |
c5aa993b | 720 | |
c906108c SS |
721 | if (i386_get_frame_setup (pc) < 0) |
722 | return (pc); | |
c5aa993b | 723 | |
fc338970 MK |
724 | /* Found valid frame setup -- codestream now points to start of push |
725 | instructions for saving registers. */ | |
c5aa993b | 726 | |
fc338970 | 727 | /* Skip over register saves. */ |
c906108c SS |
728 | for (i = 0; i < 8; i++) |
729 | { | |
730 | op = codestream_peek (); | |
fc338970 | 731 | /* Break if not `pushl' instrunction. */ |
c5aa993b | 732 | if (op < 0x50 || op > 0x57) |
c906108c SS |
733 | break; |
734 | codestream_get (); | |
735 | } | |
736 | ||
fc338970 MK |
737 | /* The native cc on SVR4 in -K PIC mode inserts the following code |
738 | to get the address of the global offset table (GOT) into register | |
739 | %ebx | |
740 | ||
741 | call 0x0 | |
742 | popl %ebx | |
743 | movl %ebx,x(%ebp) (optional) | |
744 | addl y,%ebx | |
745 | ||
c906108c SS |
746 | This code is with the rest of the prologue (at the end of the |
747 | function), so we have to skip it to get to the first real | |
748 | instruction at the start of the function. */ | |
c5aa993b | 749 | |
c906108c SS |
750 | pos = codestream_tell (); |
751 | for (i = 0; i < 6; i++) | |
752 | { | |
753 | op = codestream_get (); | |
c5aa993b | 754 | if (pic_pat[i] != op) |
c906108c SS |
755 | break; |
756 | } | |
757 | if (i == 6) | |
758 | { | |
759 | unsigned char buf[4]; | |
760 | long delta = 6; | |
761 | ||
762 | op = codestream_get (); | |
c5aa993b | 763 | if (op == 0x89) /* movl %ebx, x(%ebp) */ |
c906108c SS |
764 | { |
765 | op = codestream_get (); | |
fc338970 | 766 | if (op == 0x5d) /* One byte offset from %ebp. */ |
c906108c SS |
767 | { |
768 | delta += 3; | |
769 | codestream_read (buf, 1); | |
770 | } | |
fc338970 | 771 | else if (op == 0x9d) /* Four byte offset from %ebp. */ |
c906108c SS |
772 | { |
773 | delta += 6; | |
774 | codestream_read (buf, 4); | |
775 | } | |
fc338970 | 776 | else /* Unexpected instruction. */ |
c5aa993b JM |
777 | delta = -1; |
778 | op = codestream_get (); | |
c906108c | 779 | } |
c5aa993b JM |
780 | /* addl y,%ebx */ |
781 | if (delta > 0 && op == 0x81 && codestream_get () == 0xc3) | |
c906108c | 782 | { |
c5aa993b | 783 | pos += delta + 6; |
c906108c SS |
784 | } |
785 | } | |
786 | codestream_seek (pos); | |
c5aa993b | 787 | |
c906108c | 788 | i386_follow_jump (); |
c5aa993b | 789 | |
c906108c SS |
790 | return (codestream_tell ()); |
791 | } | |
792 | ||
93924b6b MK |
793 | /* Use the program counter to determine the contents and size of a |
794 | breakpoint instruction. Return a pointer to a string of bytes that | |
795 | encode a breakpoint instruction, store the length of the string in | |
796 | *LEN and optionally adjust *PC to point to the correct memory | |
797 | location for inserting the breakpoint. | |
798 | ||
799 | On the i386 we have a single breakpoint that fits in a single byte | |
800 | and can be inserted anywhere. */ | |
801 | ||
802 | static const unsigned char * | |
803 | i386_breakpoint_from_pc (CORE_ADDR *pc, int *len) | |
804 | { | |
805 | static unsigned char break_insn[] = { 0xcc }; /* int 3 */ | |
806 | ||
807 | *len = sizeof (break_insn); | |
808 | return break_insn; | |
809 | } | |
810 | ||
c0d1d883 MK |
811 | /* Push the return address (pointing to the call dummy) onto the stack |
812 | and return the new value for the stack pointer. */ | |
c5aa993b | 813 | |
c0d1d883 MK |
814 | static CORE_ADDR |
815 | i386_push_return_address (CORE_ADDR pc, CORE_ADDR sp) | |
a7769679 | 816 | { |
c0d1d883 | 817 | char buf[4]; |
a7769679 | 818 | |
c0d1d883 MK |
819 | store_unsigned_integer (buf, 4, CALL_DUMMY_ADDRESS ()); |
820 | write_memory (sp - 4, buf, 4); | |
821 | return sp - 4; | |
a7769679 MK |
822 | } |
823 | ||
3a1e71e3 | 824 | static void |
c0d1d883 | 825 | i386_do_pop_frame (struct frame_info *frame) |
c906108c | 826 | { |
c906108c SS |
827 | CORE_ADDR fp; |
828 | int regnum; | |
00f8375e | 829 | char regbuf[I386_MAX_REGISTER_SIZE]; |
c5aa993b | 830 | |
c906108c | 831 | fp = FRAME_FP (frame); |
1211c4e4 AC |
832 | i386_frame_init_saved_regs (frame); |
833 | ||
c5aa993b | 834 | for (regnum = 0; regnum < NUM_REGS; regnum++) |
c906108c | 835 | { |
fc338970 MK |
836 | CORE_ADDR addr; |
837 | addr = frame->saved_regs[regnum]; | |
838 | if (addr) | |
c906108c | 839 | { |
fc338970 | 840 | read_memory (addr, regbuf, REGISTER_RAW_SIZE (regnum)); |
4caf0990 | 841 | deprecated_write_register_gen (regnum, regbuf); |
c906108c SS |
842 | } |
843 | } | |
844 | write_register (FP_REGNUM, read_memory_integer (fp, 4)); | |
845 | write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); | |
846 | write_register (SP_REGNUM, fp + 8); | |
847 | flush_cached_frames (); | |
848 | } | |
c0d1d883 MK |
849 | |
850 | static void | |
851 | i386_pop_frame (void) | |
852 | { | |
853 | generic_pop_current_frame (i386_do_pop_frame); | |
854 | } | |
fc338970 | 855 | \f |
c906108c | 856 | |
fc338970 MK |
857 | /* Figure out where the longjmp will land. Slurp the args out of the |
858 | stack. We expect the first arg to be a pointer to the jmp_buf | |
8201327c MK |
859 | structure from which we extract the address that we will land at. |
860 | This address is copied into PC. This routine returns true on | |
fc338970 | 861 | success. */ |
c906108c | 862 | |
8201327c MK |
863 | static int |
864 | i386_get_longjmp_target (CORE_ADDR *pc) | |
c906108c | 865 | { |
8201327c | 866 | char buf[4]; |
c906108c | 867 | CORE_ADDR sp, jb_addr; |
8201327c | 868 | int jb_pc_offset = gdbarch_tdep (current_gdbarch)->jb_pc_offset; |
c906108c | 869 | |
8201327c MK |
870 | /* If JB_PC_OFFSET is -1, we have no way to find out where the |
871 | longjmp will land. */ | |
872 | if (jb_pc_offset == -1) | |
c906108c SS |
873 | return 0; |
874 | ||
8201327c MK |
875 | sp = read_register (SP_REGNUM); |
876 | if (target_read_memory (sp + 4, buf, 4)) | |
c906108c SS |
877 | return 0; |
878 | ||
8201327c MK |
879 | jb_addr = extract_address (buf, 4); |
880 | if (target_read_memory (jb_addr + jb_pc_offset, buf, 4)) | |
881 | return 0; | |
c906108c | 882 | |
8201327c | 883 | *pc = extract_address (buf, 4); |
c906108c SS |
884 | return 1; |
885 | } | |
fc338970 | 886 | \f |
c906108c | 887 | |
3a1e71e3 | 888 | static CORE_ADDR |
ea7c478f | 889 | i386_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
22f8ba57 MK |
890 | int struct_return, CORE_ADDR struct_addr) |
891 | { | |
892 | sp = default_push_arguments (nargs, args, sp, struct_return, struct_addr); | |
893 | ||
894 | if (struct_return) | |
895 | { | |
896 | char buf[4]; | |
897 | ||
898 | sp -= 4; | |
899 | store_address (buf, 4, struct_addr); | |
900 | write_memory (sp, buf, 4); | |
901 | } | |
902 | ||
903 | return sp; | |
904 | } | |
905 | ||
3a1e71e3 | 906 | static void |
22f8ba57 MK |
907 | i386_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
908 | { | |
909 | /* Do nothing. Everything was already done by i386_push_arguments. */ | |
910 | } | |
911 | ||
1a309862 MK |
912 | /* These registers are used for returning integers (and on some |
913 | targets also for returning `struct' and `union' values when their | |
ef9dff19 | 914 | size and alignment match an integer type). */ |
1a309862 MK |
915 | #define LOW_RETURN_REGNUM 0 /* %eax */ |
916 | #define HIGH_RETURN_REGNUM 2 /* %edx */ | |
917 | ||
918 | /* Extract from an array REGBUF containing the (raw) register state, a | |
919 | function return value of TYPE, and copy that, in virtual format, | |
920 | into VALBUF. */ | |
921 | ||
3a1e71e3 | 922 | static void |
00f8375e | 923 | i386_extract_return_value (struct type *type, struct regcache *regcache, |
ebba8386 | 924 | void *dst) |
c906108c | 925 | { |
ebba8386 | 926 | bfd_byte *valbuf = dst; |
1a309862 | 927 | int len = TYPE_LENGTH (type); |
00f8375e | 928 | char buf[I386_MAX_REGISTER_SIZE]; |
1a309862 | 929 | |
1e8d0a7b MK |
930 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
931 | && TYPE_NFIELDS (type) == 1) | |
3df1b9b4 | 932 | { |
00f8375e | 933 | i386_extract_return_value (TYPE_FIELD_TYPE (type, 0), regcache, valbuf); |
3df1b9b4 MK |
934 | return; |
935 | } | |
1e8d0a7b MK |
936 | |
937 | if (TYPE_CODE (type) == TYPE_CODE_FLT) | |
c906108c | 938 | { |
356a6b3e | 939 | if (FP0_REGNUM == 0) |
1a309862 MK |
940 | { |
941 | warning ("Cannot find floating-point return value."); | |
942 | memset (valbuf, 0, len); | |
ef9dff19 | 943 | return; |
1a309862 MK |
944 | } |
945 | ||
c6ba6f0d MK |
946 | /* Floating-point return values can be found in %st(0). Convert |
947 | its contents to the desired type. This is probably not | |
948 | exactly how it would happen on the target itself, but it is | |
949 | the best we can do. */ | |
0818c12a | 950 | regcache_raw_read (regcache, FP0_REGNUM, buf); |
00f8375e | 951 | convert_typed_floating (buf, builtin_type_i387_ext, valbuf, type); |
c906108c SS |
952 | } |
953 | else | |
c5aa993b | 954 | { |
d4f3574e SS |
955 | int low_size = REGISTER_RAW_SIZE (LOW_RETURN_REGNUM); |
956 | int high_size = REGISTER_RAW_SIZE (HIGH_RETURN_REGNUM); | |
957 | ||
958 | if (len <= low_size) | |
00f8375e | 959 | { |
0818c12a | 960 | regcache_raw_read (regcache, LOW_RETURN_REGNUM, buf); |
00f8375e MK |
961 | memcpy (valbuf, buf, len); |
962 | } | |
d4f3574e SS |
963 | else if (len <= (low_size + high_size)) |
964 | { | |
0818c12a | 965 | regcache_raw_read (regcache, LOW_RETURN_REGNUM, buf); |
00f8375e | 966 | memcpy (valbuf, buf, low_size); |
0818c12a | 967 | regcache_raw_read (regcache, HIGH_RETURN_REGNUM, buf); |
00f8375e | 968 | memcpy (valbuf + low_size, buf, len - low_size); |
d4f3574e SS |
969 | } |
970 | else | |
8e65ff28 AC |
971 | internal_error (__FILE__, __LINE__, |
972 | "Cannot extract return value of %d bytes long.", len); | |
c906108c SS |
973 | } |
974 | } | |
975 | ||
ef9dff19 MK |
976 | /* Write into the appropriate registers a function return value stored |
977 | in VALBUF of type TYPE, given in virtual format. */ | |
978 | ||
3a1e71e3 | 979 | static void |
3d7f4f49 MK |
980 | i386_store_return_value (struct type *type, struct regcache *regcache, |
981 | const void *valbuf) | |
ef9dff19 MK |
982 | { |
983 | int len = TYPE_LENGTH (type); | |
984 | ||
1e8d0a7b MK |
985 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
986 | && TYPE_NFIELDS (type) == 1) | |
3df1b9b4 | 987 | { |
3d7f4f49 | 988 | i386_store_return_value (TYPE_FIELD_TYPE (type, 0), regcache, valbuf); |
3df1b9b4 MK |
989 | return; |
990 | } | |
1e8d0a7b MK |
991 | |
992 | if (TYPE_CODE (type) == TYPE_CODE_FLT) | |
ef9dff19 | 993 | { |
3d7f4f49 | 994 | ULONGEST fstat; |
c6ba6f0d | 995 | char buf[FPU_REG_RAW_SIZE]; |
ccb945b8 | 996 | |
356a6b3e | 997 | if (FP0_REGNUM == 0) |
ef9dff19 MK |
998 | { |
999 | warning ("Cannot set floating-point return value."); | |
1000 | return; | |
1001 | } | |
1002 | ||
635b0cc1 MK |
1003 | /* Returning floating-point values is a bit tricky. Apart from |
1004 | storing the return value in %st(0), we have to simulate the | |
1005 | state of the FPU at function return point. */ | |
1006 | ||
c6ba6f0d MK |
1007 | /* Convert the value found in VALBUF to the extended |
1008 | floating-point format used by the FPU. This is probably | |
1009 | not exactly how it would happen on the target itself, but | |
1010 | it is the best we can do. */ | |
1011 | convert_typed_floating (valbuf, type, buf, builtin_type_i387_ext); | |
3d7f4f49 | 1012 | regcache_raw_write (regcache, FP0_REGNUM, buf); |
ccb945b8 | 1013 | |
635b0cc1 MK |
1014 | /* Set the top of the floating-point register stack to 7. The |
1015 | actual value doesn't really matter, but 7 is what a normal | |
1016 | function return would end up with if the program started out | |
1017 | with a freshly initialized FPU. */ | |
3d7f4f49 | 1018 | regcache_raw_read_unsigned (regcache, FSTAT_REGNUM, &fstat); |
ccb945b8 | 1019 | fstat |= (7 << 11); |
3d7f4f49 | 1020 | regcache_raw_write_unsigned (regcache, FSTAT_REGNUM, fstat); |
ccb945b8 | 1021 | |
635b0cc1 MK |
1022 | /* Mark %st(1) through %st(7) as empty. Since we set the top of |
1023 | the floating-point register stack to 7, the appropriate value | |
1024 | for the tag word is 0x3fff. */ | |
3d7f4f49 | 1025 | regcache_raw_write_unsigned (regcache, FTAG_REGNUM, 0x3fff); |
ef9dff19 MK |
1026 | } |
1027 | else | |
1028 | { | |
1029 | int low_size = REGISTER_RAW_SIZE (LOW_RETURN_REGNUM); | |
1030 | int high_size = REGISTER_RAW_SIZE (HIGH_RETURN_REGNUM); | |
1031 | ||
1032 | if (len <= low_size) | |
3d7f4f49 | 1033 | regcache_raw_write_part (regcache, LOW_RETURN_REGNUM, 0, len, valbuf); |
ef9dff19 MK |
1034 | else if (len <= (low_size + high_size)) |
1035 | { | |
3d7f4f49 MK |
1036 | regcache_raw_write (regcache, LOW_RETURN_REGNUM, valbuf); |
1037 | regcache_raw_write_part (regcache, HIGH_RETURN_REGNUM, 0, | |
1038 | len - low_size, (char *) valbuf + low_size); | |
ef9dff19 MK |
1039 | } |
1040 | else | |
8e65ff28 AC |
1041 | internal_error (__FILE__, __LINE__, |
1042 | "Cannot store return value of %d bytes long.", len); | |
ef9dff19 MK |
1043 | } |
1044 | } | |
f7af9647 | 1045 | |
751f1375 MK |
1046 | /* Extract from REGCACHE, which contains the (raw) register state, the |
1047 | address in which a function should return its structure value, as a | |
1048 | CORE_ADDR. */ | |
f7af9647 | 1049 | |
3a1e71e3 | 1050 | static CORE_ADDR |
00f8375e | 1051 | i386_extract_struct_value_address (struct regcache *regcache) |
f7af9647 | 1052 | { |
751f1375 MK |
1053 | ULONGEST addr; |
1054 | ||
1055 | regcache_raw_read_unsigned (regcache, LOW_RETURN_REGNUM, &addr); | |
1056 | return addr; | |
f7af9647 | 1057 | } |
fc338970 | 1058 | \f |
ef9dff19 | 1059 | |
8201327c MK |
1060 | /* This is the variable that is set with "set struct-convention", and |
1061 | its legitimate values. */ | |
1062 | static const char default_struct_convention[] = "default"; | |
1063 | static const char pcc_struct_convention[] = "pcc"; | |
1064 | static const char reg_struct_convention[] = "reg"; | |
1065 | static const char *valid_conventions[] = | |
1066 | { | |
1067 | default_struct_convention, | |
1068 | pcc_struct_convention, | |
1069 | reg_struct_convention, | |
1070 | NULL | |
1071 | }; | |
1072 | static const char *struct_convention = default_struct_convention; | |
1073 | ||
1074 | static int | |
1075 | i386_use_struct_convention (int gcc_p, struct type *type) | |
1076 | { | |
1077 | enum struct_return struct_return; | |
1078 | ||
1079 | if (struct_convention == default_struct_convention) | |
1080 | struct_return = gdbarch_tdep (current_gdbarch)->struct_return; | |
1081 | else if (struct_convention == pcc_struct_convention) | |
1082 | struct_return = pcc_struct_return; | |
1083 | else | |
1084 | struct_return = reg_struct_return; | |
1085 | ||
1086 | return generic_use_struct_convention (struct_return == reg_struct_return, | |
1087 | type); | |
1088 | } | |
1089 | \f | |
1090 | ||
d7a0d72c MK |
1091 | /* Return the GDB type object for the "standard" data type of data in |
1092 | register REGNUM. Perhaps %esi and %edi should go here, but | |
1093 | potentially they could be used for things other than address. */ | |
1094 | ||
3a1e71e3 | 1095 | static struct type * |
d7a0d72c MK |
1096 | i386_register_virtual_type (int regnum) |
1097 | { | |
1098 | if (regnum == PC_REGNUM || regnum == FP_REGNUM || regnum == SP_REGNUM) | |
1099 | return lookup_pointer_type (builtin_type_void); | |
1100 | ||
66da5fd8 | 1101 | if (FP_REGNUM_P (regnum)) |
c6ba6f0d | 1102 | return builtin_type_i387_ext; |
d7a0d72c | 1103 | |
66da5fd8 | 1104 | if (SSE_REGNUM_P (regnum)) |
3139facc | 1105 | return builtin_type_vec128i; |
d7a0d72c | 1106 | |
28fc6740 AC |
1107 | if (mmx_regnum_p (regnum)) |
1108 | return builtin_type_vec64i; | |
1109 | ||
d7a0d72c MK |
1110 | return builtin_type_int; |
1111 | } | |
1112 | ||
28fc6740 AC |
1113 | /* Map a cooked register onto a raw register or memory. For the i386, |
1114 | the MMX registers need to be mapped onto floating point registers. */ | |
1115 | ||
1116 | static int | |
1117 | mmx_regnum_to_fp_regnum (struct regcache *regcache, int regnum) | |
1118 | { | |
1119 | int mmxi; | |
1120 | ULONGEST fstat; | |
1121 | int tos; | |
1122 | int fpi; | |
1123 | mmxi = regnum - MM0_REGNUM; | |
1124 | regcache_raw_read_unsigned (regcache, FSTAT_REGNUM, &fstat); | |
1125 | tos = (fstat >> 11) & 0x7; | |
1126 | fpi = (mmxi + tos) % 8; | |
1127 | return (FP0_REGNUM + fpi); | |
1128 | } | |
1129 | ||
1130 | static void | |
1131 | i386_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache, | |
1132 | int regnum, void *buf) | |
1133 | { | |
1134 | if (mmx_regnum_p (regnum)) | |
1135 | { | |
1136 | char *mmx_buf = alloca (MAX_REGISTER_RAW_SIZE); | |
1137 | int fpnum = mmx_regnum_to_fp_regnum (regcache, regnum); | |
1138 | regcache_raw_read (regcache, fpnum, mmx_buf); | |
1139 | /* Extract (always little endian). */ | |
1140 | memcpy (buf, mmx_buf, REGISTER_RAW_SIZE (regnum)); | |
1141 | } | |
1142 | else | |
1143 | regcache_raw_read (regcache, regnum, buf); | |
1144 | } | |
1145 | ||
1146 | static void | |
1147 | i386_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache, | |
1148 | int regnum, const void *buf) | |
1149 | { | |
1150 | if (mmx_regnum_p (regnum)) | |
1151 | { | |
1152 | char *mmx_buf = alloca (MAX_REGISTER_RAW_SIZE); | |
1153 | int fpnum = mmx_regnum_to_fp_regnum (regcache, regnum); | |
1154 | /* Read ... */ | |
1155 | regcache_raw_read (regcache, fpnum, mmx_buf); | |
1156 | /* ... Modify ... (always little endian). */ | |
1157 | memcpy (mmx_buf, buf, REGISTER_RAW_SIZE (regnum)); | |
1158 | /* ... Write. */ | |
1159 | regcache_raw_write (regcache, fpnum, mmx_buf); | |
1160 | } | |
1161 | else | |
1162 | regcache_raw_write (regcache, regnum, buf); | |
1163 | } | |
1164 | ||
d7a0d72c MK |
1165 | /* Return true iff register REGNUM's virtual format is different from |
1166 | its raw format. Note that this definition assumes that the host | |
1167 | supports IEEE 32-bit floats, since it doesn't say that SSE | |
1168 | registers need conversion. Even if we can't find a counterexample, | |
1169 | this is still sloppy. */ | |
1170 | ||
3a1e71e3 | 1171 | static int |
d7a0d72c MK |
1172 | i386_register_convertible (int regnum) |
1173 | { | |
66da5fd8 | 1174 | return FP_REGNUM_P (regnum); |
d7a0d72c MK |
1175 | } |
1176 | ||
ac27f131 | 1177 | /* Convert data from raw format for register REGNUM in buffer FROM to |
3d261580 | 1178 | virtual format with type TYPE in buffer TO. */ |
ac27f131 | 1179 | |
3a1e71e3 | 1180 | static void |
ac27f131 MK |
1181 | i386_register_convert_to_virtual (int regnum, struct type *type, |
1182 | char *from, char *to) | |
1183 | { | |
66da5fd8 | 1184 | gdb_assert (FP_REGNUM_P (regnum)); |
3d261580 MK |
1185 | |
1186 | /* We only support floating-point values. */ | |
8d7f6b4a MK |
1187 | if (TYPE_CODE (type) != TYPE_CODE_FLT) |
1188 | { | |
1189 | warning ("Cannot convert floating-point register value " | |
1190 | "to non-floating-point type."); | |
1191 | memset (to, 0, TYPE_LENGTH (type)); | |
1192 | return; | |
1193 | } | |
3d261580 | 1194 | |
c6ba6f0d MK |
1195 | /* Convert to TYPE. This should be a no-op if TYPE is equivalent to |
1196 | the extended floating-point format used by the FPU. */ | |
1197 | convert_typed_floating (from, builtin_type_i387_ext, to, type); | |
ac27f131 MK |
1198 | } |
1199 | ||
1200 | /* Convert data from virtual format with type TYPE in buffer FROM to | |
3d261580 | 1201 | raw format for register REGNUM in buffer TO. */ |
ac27f131 | 1202 | |
3a1e71e3 | 1203 | static void |
ac27f131 MK |
1204 | i386_register_convert_to_raw (struct type *type, int regnum, |
1205 | char *from, char *to) | |
1206 | { | |
66da5fd8 | 1207 | gdb_assert (FP_REGNUM_P (regnum)); |
c6ba6f0d MK |
1208 | |
1209 | /* We only support floating-point values. */ | |
1210 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
1211 | { | |
1212 | warning ("Cannot convert non-floating-point type " | |
1213 | "to floating-point register value."); | |
1214 | memset (to, 0, TYPE_LENGTH (type)); | |
1215 | return; | |
1216 | } | |
3d261580 | 1217 | |
c6ba6f0d MK |
1218 | /* Convert from TYPE. This should be a no-op if TYPE is equivalent |
1219 | to the extended floating-point format used by the FPU. */ | |
1220 | convert_typed_floating (from, type, to, builtin_type_i387_ext); | |
ac27f131 | 1221 | } |
ac27f131 | 1222 | \f |
fc338970 | 1223 | |
c906108c | 1224 | #ifdef STATIC_TRANSFORM_NAME |
fc338970 MK |
1225 | /* SunPRO encodes the static variables. This is not related to C++ |
1226 | mangling, it is done for C too. */ | |
c906108c SS |
1227 | |
1228 | char * | |
fba45db2 | 1229 | sunpro_static_transform_name (char *name) |
c906108c SS |
1230 | { |
1231 | char *p; | |
1232 | if (IS_STATIC_TRANSFORM_NAME (name)) | |
1233 | { | |
fc338970 MK |
1234 | /* For file-local statics there will be a period, a bunch of |
1235 | junk (the contents of which match a string given in the | |
c5aa993b JM |
1236 | N_OPT), a period and the name. For function-local statics |
1237 | there will be a bunch of junk (which seems to change the | |
1238 | second character from 'A' to 'B'), a period, the name of the | |
1239 | function, and the name. So just skip everything before the | |
1240 | last period. */ | |
c906108c SS |
1241 | p = strrchr (name, '.'); |
1242 | if (p != NULL) | |
1243 | name = p + 1; | |
1244 | } | |
1245 | return name; | |
1246 | } | |
1247 | #endif /* STATIC_TRANSFORM_NAME */ | |
fc338970 | 1248 | \f |
c906108c | 1249 | |
fc338970 | 1250 | /* Stuff for WIN32 PE style DLL's but is pretty generic really. */ |
c906108c SS |
1251 | |
1252 | CORE_ADDR | |
1cce71eb | 1253 | i386_pe_skip_trampoline_code (CORE_ADDR pc, char *name) |
c906108c | 1254 | { |
fc338970 | 1255 | if (pc && read_memory_unsigned_integer (pc, 2) == 0x25ff) /* jmp *(dest) */ |
c906108c | 1256 | { |
c5aa993b | 1257 | unsigned long indirect = read_memory_unsigned_integer (pc + 2, 4); |
c906108c | 1258 | struct minimal_symbol *indsym = |
fc338970 | 1259 | indirect ? lookup_minimal_symbol_by_pc (indirect) : 0; |
c5aa993b | 1260 | char *symname = indsym ? SYMBOL_NAME (indsym) : 0; |
c906108c | 1261 | |
c5aa993b | 1262 | if (symname) |
c906108c | 1263 | { |
c5aa993b JM |
1264 | if (strncmp (symname, "__imp_", 6) == 0 |
1265 | || strncmp (symname, "_imp_", 5) == 0) | |
c906108c SS |
1266 | return name ? 1 : read_memory_unsigned_integer (indirect, 4); |
1267 | } | |
1268 | } | |
fc338970 | 1269 | return 0; /* Not a trampoline. */ |
c906108c | 1270 | } |
fc338970 MK |
1271 | \f |
1272 | ||
8201327c MK |
1273 | /* Return non-zero if PC and NAME show that we are in a signal |
1274 | trampoline. */ | |
1275 | ||
1276 | static int | |
1277 | i386_pc_in_sigtramp (CORE_ADDR pc, char *name) | |
1278 | { | |
1279 | return (name && strcmp ("_sigtramp", name) == 0); | |
1280 | } | |
1281 | \f | |
1282 | ||
fc338970 MK |
1283 | /* We have two flavours of disassembly. The machinery on this page |
1284 | deals with switching between those. */ | |
c906108c SS |
1285 | |
1286 | static int | |
5e3397bb | 1287 | i386_print_insn (bfd_vma pc, disassemble_info *info) |
c906108c | 1288 | { |
5e3397bb MK |
1289 | gdb_assert (disassembly_flavor == att_flavor |
1290 | || disassembly_flavor == intel_flavor); | |
1291 | ||
1292 | /* FIXME: kettenis/20020915: Until disassembler_options is properly | |
1293 | constified, cast to prevent a compiler warning. */ | |
1294 | info->disassembler_options = (char *) disassembly_flavor; | |
1295 | info->mach = gdbarch_bfd_arch_info (current_gdbarch)->mach; | |
1296 | ||
1297 | return print_insn_i386 (pc, info); | |
7a292a7a | 1298 | } |
fc338970 | 1299 | \f |
3ce1502b | 1300 | |
8201327c MK |
1301 | /* There are a few i386 architecture variants that differ only |
1302 | slightly from the generic i386 target. For now, we don't give them | |
1303 | their own source file, but include them here. As a consequence, | |
1304 | they'll always be included. */ | |
3ce1502b | 1305 | |
8201327c | 1306 | /* System V Release 4 (SVR4). */ |
3ce1502b | 1307 | |
8201327c MK |
1308 | static int |
1309 | i386_svr4_pc_in_sigtramp (CORE_ADDR pc, char *name) | |
d2a7c97a | 1310 | { |
8201327c MK |
1311 | return (name && (strcmp ("_sigreturn", name) == 0 |
1312 | || strcmp ("_sigacthandler", name) == 0 | |
1313 | || strcmp ("sigvechandler", name) == 0)); | |
1314 | } | |
d2a7c97a | 1315 | |
21d0e8a4 MK |
1316 | /* Get address of the pushed ucontext (sigcontext) on the stack for |
1317 | all three variants of SVR4 sigtramps. */ | |
3ce1502b | 1318 | |
3a1e71e3 | 1319 | static CORE_ADDR |
21d0e8a4 | 1320 | i386_svr4_sigcontext_addr (struct frame_info *frame) |
8201327c | 1321 | { |
21d0e8a4 | 1322 | int sigcontext_offset = -1; |
8201327c MK |
1323 | char *name = NULL; |
1324 | ||
1325 | find_pc_partial_function (frame->pc, &name, NULL, NULL); | |
1326 | if (name) | |
d2a7c97a | 1327 | { |
8201327c | 1328 | if (strcmp (name, "_sigreturn") == 0) |
21d0e8a4 | 1329 | sigcontext_offset = 132; |
8201327c | 1330 | else if (strcmp (name, "_sigacthandler") == 0) |
21d0e8a4 | 1331 | sigcontext_offset = 80; |
8201327c | 1332 | else if (strcmp (name, "sigvechandler") == 0) |
21d0e8a4 | 1333 | sigcontext_offset = 120; |
8201327c | 1334 | } |
3ce1502b | 1335 | |
21d0e8a4 MK |
1336 | gdb_assert (sigcontext_offset != -1); |
1337 | ||
8201327c | 1338 | if (frame->next) |
21d0e8a4 MK |
1339 | return frame->next->frame + sigcontext_offset; |
1340 | return read_register (SP_REGNUM) + sigcontext_offset; | |
8201327c MK |
1341 | } |
1342 | \f | |
3ce1502b | 1343 | |
8201327c | 1344 | /* DJGPP. */ |
d2a7c97a | 1345 | |
8201327c MK |
1346 | static int |
1347 | i386_go32_pc_in_sigtramp (CORE_ADDR pc, char *name) | |
1348 | { | |
1349 | /* DJGPP doesn't have any special frames for signal handlers. */ | |
1350 | return 0; | |
1351 | } | |
1352 | \f | |
d2a7c97a | 1353 | |
8201327c | 1354 | /* Generic ELF. */ |
d2a7c97a | 1355 | |
8201327c MK |
1356 | void |
1357 | i386_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1358 | { | |
1359 | /* We typically use stabs-in-ELF with the DWARF register numbering. */ | |
1360 | set_gdbarch_stab_reg_to_regnum (gdbarch, i386_dwarf_reg_to_regnum); | |
1361 | } | |
3ce1502b | 1362 | |
8201327c | 1363 | /* System V Release 4 (SVR4). */ |
3ce1502b | 1364 | |
8201327c MK |
1365 | void |
1366 | i386_svr4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1367 | { | |
1368 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3ce1502b | 1369 | |
8201327c MK |
1370 | /* System V Release 4 uses ELF. */ |
1371 | i386_elf_init_abi (info, gdbarch); | |
3ce1502b | 1372 | |
dfe01d39 MK |
1373 | /* System V Release 4 has shared libraries. */ |
1374 | set_gdbarch_in_solib_call_trampoline (gdbarch, in_plt_section); | |
1375 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); | |
1376 | ||
8201327c | 1377 | /* FIXME: kettenis/20020511: Why do we override this function here? */ |
b4671f85 | 1378 | set_gdbarch_frame_chain_valid (gdbarch, generic_func_frame_chain_valid); |
3ce1502b | 1379 | |
8201327c | 1380 | set_gdbarch_pc_in_sigtramp (gdbarch, i386_svr4_pc_in_sigtramp); |
21d0e8a4 MK |
1381 | tdep->sigcontext_addr = i386_svr4_sigcontext_addr; |
1382 | tdep->sc_pc_offset = 14 * 4; | |
1383 | tdep->sc_sp_offset = 7 * 4; | |
3ce1502b | 1384 | |
8201327c | 1385 | tdep->jb_pc_offset = 20; |
3ce1502b MK |
1386 | } |
1387 | ||
8201327c | 1388 | /* DJGPP. */ |
3ce1502b | 1389 | |
3a1e71e3 | 1390 | static void |
8201327c | 1391 | i386_go32_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
3ce1502b | 1392 | { |
8201327c | 1393 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
3ce1502b | 1394 | |
8201327c | 1395 | set_gdbarch_pc_in_sigtramp (gdbarch, i386_go32_pc_in_sigtramp); |
3ce1502b | 1396 | |
8201327c | 1397 | tdep->jb_pc_offset = 36; |
3ce1502b MK |
1398 | } |
1399 | ||
8201327c | 1400 | /* NetWare. */ |
3ce1502b | 1401 | |
3a1e71e3 | 1402 | static void |
8201327c | 1403 | i386_nw_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
3ce1502b | 1404 | { |
8201327c | 1405 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
3ce1502b | 1406 | |
8201327c | 1407 | /* FIXME: kettenis/20020511: Why do we override this function here? */ |
b4671f85 | 1408 | set_gdbarch_frame_chain_valid (gdbarch, generic_func_frame_chain_valid); |
8201327c MK |
1409 | |
1410 | tdep->jb_pc_offset = 24; | |
d2a7c97a | 1411 | } |
8201327c | 1412 | \f |
2acceee2 | 1413 | |
3a1e71e3 | 1414 | static struct gdbarch * |
a62cc96e AC |
1415 | i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
1416 | { | |
cd3c07fc | 1417 | struct gdbarch_tdep *tdep; |
a62cc96e | 1418 | struct gdbarch *gdbarch; |
8201327c | 1419 | enum gdb_osabi osabi = GDB_OSABI_UNKNOWN; |
a62cc96e | 1420 | |
8201327c | 1421 | /* Try to determine the OS ABI of the object we're loading. */ |
3ce1502b | 1422 | if (info.abfd != NULL) |
8201327c | 1423 | osabi = gdbarch_lookup_osabi (info.abfd); |
d2a7c97a | 1424 | |
3ce1502b | 1425 | /* Find a candidate among extant architectures. */ |
d2a7c97a MK |
1426 | for (arches = gdbarch_list_lookup_by_info (arches, &info); |
1427 | arches != NULL; | |
1428 | arches = gdbarch_list_lookup_by_info (arches->next, &info)) | |
1429 | { | |
8201327c | 1430 | /* Make sure the OS ABI selection matches. */ |
65d6d66a | 1431 | tdep = gdbarch_tdep (arches->gdbarch); |
8201327c | 1432 | if (tdep && tdep->osabi == osabi) |
65d6d66a | 1433 | return arches->gdbarch; |
d2a7c97a | 1434 | } |
a62cc96e AC |
1435 | |
1436 | /* Allocate space for the new architecture. */ | |
1437 | tdep = XMALLOC (struct gdbarch_tdep); | |
1438 | gdbarch = gdbarch_alloc (&info, tdep); | |
1439 | ||
8201327c MK |
1440 | tdep->osabi = osabi; |
1441 | ||
1442 | /* The i386 default settings don't include the SSE registers. | |
356a6b3e MK |
1443 | FIXME: kettenis/20020614: They do include the FPU registers for |
1444 | now, which probably is not quite right. */ | |
8201327c | 1445 | tdep->num_xmm_regs = 0; |
d2a7c97a | 1446 | |
8201327c MK |
1447 | tdep->jb_pc_offset = -1; |
1448 | tdep->struct_return = pcc_struct_return; | |
8201327c MK |
1449 | tdep->sigtramp_start = 0; |
1450 | tdep->sigtramp_end = 0; | |
21d0e8a4 | 1451 | tdep->sigcontext_addr = NULL; |
8201327c | 1452 | tdep->sc_pc_offset = -1; |
21d0e8a4 | 1453 | tdep->sc_sp_offset = -1; |
8201327c | 1454 | |
896fb97d MK |
1455 | /* The format used for `long double' on almost all i386 targets is |
1456 | the i387 extended floating-point format. In fact, of all targets | |
1457 | in the GCC 2.95 tree, only OSF/1 does it different, and insists | |
1458 | on having a `long double' that's not `long' at all. */ | |
1459 | set_gdbarch_long_double_format (gdbarch, &floatformat_i387_ext); | |
21d0e8a4 | 1460 | |
66da5fd8 | 1461 | /* Although the i387 extended floating-point has only 80 significant |
896fb97d MK |
1462 | bits, a `long double' actually takes up 96, probably to enforce |
1463 | alignment. */ | |
1464 | set_gdbarch_long_double_bit (gdbarch, 96); | |
1465 | ||
356a6b3e MK |
1466 | /* NOTE: tm-i386aix.h, tm-i386bsd.h, tm-i386os9k.h, tm-ptx.h, |
1467 | tm-symmetry.h currently override this. Sigh. */ | |
1468 | set_gdbarch_num_regs (gdbarch, I386_NUM_GREGS + I386_NUM_FREGS); | |
21d0e8a4 | 1469 | |
66da5fd8 MK |
1470 | set_gdbarch_sp_regnum (gdbarch, 4); /* %esp */ |
1471 | set_gdbarch_fp_regnum (gdbarch, 5); /* %ebp */ | |
1472 | set_gdbarch_pc_regnum (gdbarch, 8); /* %eip */ | |
1473 | set_gdbarch_ps_regnum (gdbarch, 9); /* %eflags */ | |
1474 | set_gdbarch_fp0_regnum (gdbarch, 16); /* %st(0) */ | |
356a6b3e MK |
1475 | |
1476 | /* Use the "default" register numbering scheme for stabs and COFF. */ | |
1477 | set_gdbarch_stab_reg_to_regnum (gdbarch, i386_stab_reg_to_regnum); | |
1478 | set_gdbarch_sdb_reg_to_regnum (gdbarch, i386_stab_reg_to_regnum); | |
1479 | ||
1480 | /* Use the DWARF register numbering scheme for DWARF and DWARF 2. */ | |
1481 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, i386_dwarf_reg_to_regnum); | |
1482 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, i386_dwarf_reg_to_regnum); | |
1483 | ||
1484 | /* We don't define ECOFF_REG_TO_REGNUM, since ECOFF doesn't seem to | |
1485 | be in use on any of the supported i386 targets. */ | |
1486 | ||
1487 | set_gdbarch_register_name (gdbarch, i386_register_name); | |
1488 | set_gdbarch_register_size (gdbarch, 4); | |
1489 | set_gdbarch_register_bytes (gdbarch, I386_SIZEOF_GREGS + I386_SIZEOF_FREGS); | |
00f8375e MK |
1490 | set_gdbarch_max_register_raw_size (gdbarch, I386_MAX_REGISTER_SIZE); |
1491 | set_gdbarch_max_register_virtual_size (gdbarch, I386_MAX_REGISTER_SIZE); | |
b6197528 | 1492 | set_gdbarch_register_virtual_type (gdbarch, i386_register_virtual_type); |
356a6b3e | 1493 | |
61113f8b MK |
1494 | set_gdbarch_print_float_info (gdbarch, i387_print_float_info); |
1495 | ||
8201327c | 1496 | set_gdbarch_get_longjmp_target (gdbarch, i386_get_longjmp_target); |
96297dab | 1497 | |
c0d1d883 | 1498 | set_gdbarch_use_generic_dummy_frames (gdbarch, 1); |
a62cc96e AC |
1499 | |
1500 | /* Call dummy code. */ | |
c0d1d883 MK |
1501 | set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT); |
1502 | set_gdbarch_call_dummy_address (gdbarch, entry_point_address); | |
8758dec1 | 1503 | set_gdbarch_call_dummy_start_offset (gdbarch, 0); |
c0d1d883 | 1504 | set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0); |
a62cc96e | 1505 | set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1); |
c0d1d883 | 1506 | set_gdbarch_call_dummy_length (gdbarch, 0); |
a62cc96e | 1507 | set_gdbarch_call_dummy_p (gdbarch, 1); |
c0d1d883 MK |
1508 | set_gdbarch_call_dummy_words (gdbarch, NULL); |
1509 | set_gdbarch_sizeof_call_dummy_words (gdbarch, 0); | |
a62cc96e | 1510 | set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); |
c0d1d883 | 1511 | set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy); |
a62cc96e | 1512 | |
b6197528 MK |
1513 | set_gdbarch_register_convertible (gdbarch, i386_register_convertible); |
1514 | set_gdbarch_register_convert_to_virtual (gdbarch, | |
1515 | i386_register_convert_to_virtual); | |
1516 | set_gdbarch_register_convert_to_raw (gdbarch, i386_register_convert_to_raw); | |
1517 | ||
7b4c2dce | 1518 | set_gdbarch_get_saved_register (gdbarch, generic_unwind_get_saved_register); |
a62cc96e | 1519 | |
c0d1d883 | 1520 | set_gdbarch_pc_in_call_dummy (gdbarch, pc_in_call_dummy_at_entry_point); |
a62cc96e | 1521 | |
8758dec1 MK |
1522 | /* "An argument's size is increased, if necessary, to make it a |
1523 | multiple of [32-bit] words. This may require tail padding, | |
1524 | depending on the size of the argument" -- from the x86 ABI. */ | |
1525 | set_gdbarch_parm_boundary (gdbarch, 32); | |
1526 | ||
00f8375e | 1527 | set_gdbarch_extract_return_value (gdbarch, i386_extract_return_value); |
fc08ec52 | 1528 | set_gdbarch_push_arguments (gdbarch, i386_push_arguments); |
c0d1d883 MK |
1529 | set_gdbarch_push_dummy_frame (gdbarch, generic_push_dummy_frame); |
1530 | set_gdbarch_push_return_address (gdbarch, i386_push_return_address); | |
fc08ec52 MK |
1531 | set_gdbarch_pop_frame (gdbarch, i386_pop_frame); |
1532 | set_gdbarch_store_struct_return (gdbarch, i386_store_struct_return); | |
3d7f4f49 | 1533 | set_gdbarch_store_return_value (gdbarch, i386_store_return_value); |
00f8375e | 1534 | set_gdbarch_extract_struct_value_address (gdbarch, |
fc08ec52 | 1535 | i386_extract_struct_value_address); |
8201327c MK |
1536 | set_gdbarch_use_struct_convention (gdbarch, i386_use_struct_convention); |
1537 | ||
42fdc8df | 1538 | set_gdbarch_frame_init_saved_regs (gdbarch, i386_frame_init_saved_regs); |
93924b6b MK |
1539 | set_gdbarch_skip_prologue (gdbarch, i386_skip_prologue); |
1540 | ||
1541 | /* Stack grows downward. */ | |
1542 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
1543 | ||
1544 | set_gdbarch_breakpoint_from_pc (gdbarch, i386_breakpoint_from_pc); | |
1545 | set_gdbarch_decr_pc_after_break (gdbarch, 1); | |
1546 | set_gdbarch_function_start_offset (gdbarch, 0); | |
42fdc8df | 1547 | |
8201327c MK |
1548 | /* The following redefines make backtracing through sigtramp work. |
1549 | They manufacture a fake sigtramp frame and obtain the saved pc in | |
1550 | sigtramp from the sigcontext structure which is pushed by the | |
1551 | kernel on the user stack, along with a pointer to it. */ | |
1552 | ||
42fdc8df MK |
1553 | set_gdbarch_frame_args_skip (gdbarch, 8); |
1554 | set_gdbarch_frameless_function_invocation (gdbarch, | |
1555 | i386_frameless_function_invocation); | |
8201327c | 1556 | set_gdbarch_frame_chain (gdbarch, i386_frame_chain); |
c0d1d883 | 1557 | set_gdbarch_frame_chain_valid (gdbarch, generic_file_frame_chain_valid); |
8201327c | 1558 | set_gdbarch_frame_saved_pc (gdbarch, i386_frame_saved_pc); |
42fdc8df MK |
1559 | set_gdbarch_frame_args_address (gdbarch, default_frame_address); |
1560 | set_gdbarch_frame_locals_address (gdbarch, default_frame_address); | |
8201327c | 1561 | set_gdbarch_saved_pc_after_call (gdbarch, i386_saved_pc_after_call); |
42fdc8df | 1562 | set_gdbarch_frame_num_args (gdbarch, i386_frame_num_args); |
8201327c MK |
1563 | set_gdbarch_pc_in_sigtramp (gdbarch, i386_pc_in_sigtramp); |
1564 | ||
28fc6740 AC |
1565 | /* Wire in the MMX registers. */ |
1566 | set_gdbarch_num_pseudo_regs (gdbarch, mmx_num_regs); | |
1567 | set_gdbarch_pseudo_register_read (gdbarch, i386_pseudo_register_read); | |
1568 | set_gdbarch_pseudo_register_write (gdbarch, i386_pseudo_register_write); | |
1569 | ||
5e3397bb MK |
1570 | set_gdbarch_print_insn (gdbarch, i386_print_insn); |
1571 | ||
3ce1502b | 1572 | /* Hook in ABI-specific overrides, if they have been registered. */ |
8201327c | 1573 | gdbarch_init_osabi (info, gdbarch, osabi); |
3ce1502b | 1574 | |
a62cc96e AC |
1575 | return gdbarch; |
1576 | } | |
1577 | ||
8201327c MK |
1578 | static enum gdb_osabi |
1579 | i386_coff_osabi_sniffer (bfd *abfd) | |
1580 | { | |
762c5349 MK |
1581 | if (strcmp (bfd_get_target (abfd), "coff-go32-exe") == 0 |
1582 | || strcmp (bfd_get_target (abfd), "coff-go32") == 0) | |
8201327c MK |
1583 | return GDB_OSABI_GO32; |
1584 | ||
1585 | return GDB_OSABI_UNKNOWN; | |
1586 | } | |
1587 | ||
1588 | static enum gdb_osabi | |
1589 | i386_nlm_osabi_sniffer (bfd *abfd) | |
1590 | { | |
1591 | return GDB_OSABI_NETWARE; | |
1592 | } | |
1593 | \f | |
1594 | ||
28e9e0f0 MK |
1595 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1596 | void _initialize_i386_tdep (void); | |
1597 | ||
c906108c | 1598 | void |
fba45db2 | 1599 | _initialize_i386_tdep (void) |
c906108c | 1600 | { |
a62cc96e AC |
1601 | register_gdbarch_init (bfd_arch_i386, i386_gdbarch_init); |
1602 | ||
fc338970 | 1603 | /* Add the variable that controls the disassembly flavor. */ |
917317f4 JM |
1604 | { |
1605 | struct cmd_list_element *new_cmd; | |
7a292a7a | 1606 | |
917317f4 JM |
1607 | new_cmd = add_set_enum_cmd ("disassembly-flavor", no_class, |
1608 | valid_flavors, | |
1ed2a135 | 1609 | &disassembly_flavor, |
fc338970 MK |
1610 | "\ |
1611 | Set the disassembly flavor, the valid values are \"att\" and \"intel\", \ | |
c906108c | 1612 | and the default value is \"att\".", |
917317f4 | 1613 | &setlist); |
917317f4 JM |
1614 | add_show_from_set (new_cmd, &showlist); |
1615 | } | |
8201327c MK |
1616 | |
1617 | /* Add the variable that controls the convention for returning | |
1618 | structs. */ | |
1619 | { | |
1620 | struct cmd_list_element *new_cmd; | |
1621 | ||
1622 | new_cmd = add_set_enum_cmd ("struct-convention", no_class, | |
5e3397bb | 1623 | valid_conventions, |
8201327c MK |
1624 | &struct_convention, "\ |
1625 | Set the convention for returning small structs, valid values \ | |
1626 | are \"default\", \"pcc\" and \"reg\", and the default value is \"default\".", | |
1627 | &setlist); | |
1628 | add_show_from_set (new_cmd, &showlist); | |
1629 | } | |
1630 | ||
1631 | gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour, | |
1632 | i386_coff_osabi_sniffer); | |
1633 | gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_nlm_flavour, | |
1634 | i386_nlm_osabi_sniffer); | |
1635 | ||
1636 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_SVR4, | |
1637 | i386_svr4_init_abi); | |
1638 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_GO32, | |
1639 | i386_go32_init_abi); | |
1640 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETWARE, | |
1641 | i386_nw_init_abi); | |
c906108c | 1642 | } |