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Commit | Line | Data |
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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" | |
c0d1d883 | 30 | #include "symfile.h" |
c906108c SS |
31 | #include "symtab.h" |
32 | #include "gdbcmd.h" | |
33 | #include "command.h" | |
b4a20239 | 34 | #include "arch-utils.h" |
4e052eda | 35 | #include "regcache.h" |
d16aafd8 | 36 | #include "doublest.h" |
fd0407d6 | 37 | #include "value.h" |
3d261580 MK |
38 | #include "gdb_assert.h" |
39 | ||
d2a7c97a | 40 | #include "i386-tdep.h" |
61113f8b | 41 | #include "i387-tdep.h" |
d2a7c97a | 42 | |
fc633446 MK |
43 | /* Names of the registers. The first 10 registers match the register |
44 | numbering scheme used by GCC for stabs and DWARF. */ | |
45 | static char *i386_register_names[] = | |
46 | { | |
47 | "eax", "ecx", "edx", "ebx", | |
48 | "esp", "ebp", "esi", "edi", | |
49 | "eip", "eflags", "cs", "ss", | |
50 | "ds", "es", "fs", "gs", | |
51 | "st0", "st1", "st2", "st3", | |
52 | "st4", "st5", "st6", "st7", | |
53 | "fctrl", "fstat", "ftag", "fiseg", | |
54 | "fioff", "foseg", "fooff", "fop", | |
55 | "xmm0", "xmm1", "xmm2", "xmm3", | |
56 | "xmm4", "xmm5", "xmm6", "xmm7", | |
57 | "mxcsr" | |
58 | }; | |
59 | ||
28fc6740 AC |
60 | /* MMX registers. */ |
61 | ||
62 | static char *i386_mmx_names[] = | |
63 | { | |
64 | "mm0", "mm1", "mm2", "mm3", | |
65 | "mm4", "mm5", "mm6", "mm7" | |
66 | }; | |
67 | static const int mmx_num_regs = (sizeof (i386_mmx_names) | |
68 | / sizeof (i386_mmx_names[0])); | |
69 | #define MM0_REGNUM (NUM_REGS) | |
70 | ||
71 | static int | |
72 | mmx_regnum_p (int reg) | |
73 | { | |
74 | return (reg >= MM0_REGNUM && reg < MM0_REGNUM + mmx_num_regs); | |
75 | } | |
76 | ||
fc633446 MK |
77 | /* Return the name of register REG. */ |
78 | ||
fa88f677 | 79 | const char * |
fc633446 MK |
80 | i386_register_name (int reg) |
81 | { | |
82 | if (reg < 0) | |
83 | return NULL; | |
28fc6740 AC |
84 | if (mmx_regnum_p (reg)) |
85 | return i386_mmx_names[reg - MM0_REGNUM]; | |
fc633446 MK |
86 | if (reg >= sizeof (i386_register_names) / sizeof (*i386_register_names)) |
87 | return NULL; | |
88 | ||
89 | return i386_register_names[reg]; | |
90 | } | |
91 | ||
85540d8c MK |
92 | /* Convert stabs register number REG to the appropriate register |
93 | number used by GDB. */ | |
94 | ||
8201327c | 95 | static int |
85540d8c MK |
96 | i386_stab_reg_to_regnum (int reg) |
97 | { | |
98 | /* This implements what GCC calls the "default" register map. */ | |
99 | if (reg >= 0 && reg <= 7) | |
100 | { | |
101 | /* General registers. */ | |
102 | return reg; | |
103 | } | |
104 | else if (reg >= 12 && reg <= 19) | |
105 | { | |
106 | /* Floating-point registers. */ | |
107 | return reg - 12 + FP0_REGNUM; | |
108 | } | |
109 | else if (reg >= 21 && reg <= 28) | |
110 | { | |
111 | /* SSE registers. */ | |
112 | return reg - 21 + XMM0_REGNUM; | |
113 | } | |
114 | else if (reg >= 29 && reg <= 36) | |
115 | { | |
116 | /* MMX registers. */ | |
7d12f766 | 117 | return reg - 29 + MM0_REGNUM; |
85540d8c MK |
118 | } |
119 | ||
120 | /* This will hopefully provoke a warning. */ | |
121 | return NUM_REGS + NUM_PSEUDO_REGS; | |
122 | } | |
123 | ||
8201327c | 124 | /* Convert DWARF register number REG to the appropriate register |
85540d8c MK |
125 | number used by GDB. */ |
126 | ||
8201327c | 127 | static int |
85540d8c MK |
128 | i386_dwarf_reg_to_regnum (int reg) |
129 | { | |
130 | /* The DWARF register numbering includes %eip and %eflags, and | |
131 | numbers the floating point registers differently. */ | |
132 | if (reg >= 0 && reg <= 9) | |
133 | { | |
134 | /* General registers. */ | |
135 | return reg; | |
136 | } | |
137 | else if (reg >= 11 && reg <= 18) | |
138 | { | |
139 | /* Floating-point registers. */ | |
140 | return reg - 11 + FP0_REGNUM; | |
141 | } | |
142 | else if (reg >= 21) | |
143 | { | |
144 | /* The SSE and MMX registers have identical numbers as in stabs. */ | |
145 | return i386_stab_reg_to_regnum (reg); | |
146 | } | |
147 | ||
148 | /* This will hopefully provoke a warning. */ | |
149 | return NUM_REGS + NUM_PSEUDO_REGS; | |
150 | } | |
fc338970 | 151 | \f |
917317f4 | 152 | |
fc338970 MK |
153 | /* This is the variable that is set with "set disassembly-flavor", and |
154 | its legitimate values. */ | |
53904c9e AC |
155 | static const char att_flavor[] = "att"; |
156 | static const char intel_flavor[] = "intel"; | |
157 | static const char *valid_flavors[] = | |
c5aa993b | 158 | { |
c906108c SS |
159 | att_flavor, |
160 | intel_flavor, | |
161 | NULL | |
162 | }; | |
53904c9e | 163 | static const char *disassembly_flavor = att_flavor; |
c906108c | 164 | |
fc338970 MK |
165 | /* Stdio style buffering was used to minimize calls to ptrace, but |
166 | this buffering did not take into account that the code section | |
167 | being accessed may not be an even number of buffers long (even if | |
168 | the buffer is only sizeof(int) long). In cases where the code | |
169 | section size happened to be a non-integral number of buffers long, | |
170 | attempting to read the last buffer would fail. Simply using | |
171 | target_read_memory and ignoring errors, rather than read_memory, is | |
172 | not the correct solution, since legitimate access errors would then | |
173 | be totally ignored. To properly handle this situation and continue | |
174 | to use buffering would require that this code be able to determine | |
175 | the minimum code section size granularity (not the alignment of the | |
176 | section itself, since the actual failing case that pointed out this | |
177 | problem had a section alignment of 4 but was not a multiple of 4 | |
178 | bytes long), on a target by target basis, and then adjust it's | |
179 | buffer size accordingly. This is messy, but potentially feasible. | |
180 | It probably needs the bfd library's help and support. For now, the | |
181 | buffer size is set to 1. (FIXME -fnf) */ | |
182 | ||
183 | #define CODESTREAM_BUFSIZ 1 /* Was sizeof(int), see note above. */ | |
c906108c SS |
184 | static CORE_ADDR codestream_next_addr; |
185 | static CORE_ADDR codestream_addr; | |
186 | static unsigned char codestream_buf[CODESTREAM_BUFSIZ]; | |
187 | static int codestream_off; | |
188 | static int codestream_cnt; | |
189 | ||
190 | #define codestream_tell() (codestream_addr + codestream_off) | |
fc338970 MK |
191 | #define codestream_peek() \ |
192 | (codestream_cnt == 0 ? \ | |
193 | codestream_fill(1) : codestream_buf[codestream_off]) | |
194 | #define codestream_get() \ | |
195 | (codestream_cnt-- == 0 ? \ | |
196 | codestream_fill(0) : codestream_buf[codestream_off++]) | |
c906108c | 197 | |
c5aa993b | 198 | static unsigned char |
fba45db2 | 199 | codestream_fill (int peek_flag) |
c906108c SS |
200 | { |
201 | codestream_addr = codestream_next_addr; | |
202 | codestream_next_addr += CODESTREAM_BUFSIZ; | |
203 | codestream_off = 0; | |
204 | codestream_cnt = CODESTREAM_BUFSIZ; | |
205 | read_memory (codestream_addr, (char *) codestream_buf, CODESTREAM_BUFSIZ); | |
c5aa993b | 206 | |
c906108c | 207 | if (peek_flag) |
c5aa993b | 208 | return (codestream_peek ()); |
c906108c | 209 | else |
c5aa993b | 210 | return (codestream_get ()); |
c906108c SS |
211 | } |
212 | ||
213 | static void | |
fba45db2 | 214 | codestream_seek (CORE_ADDR place) |
c906108c SS |
215 | { |
216 | codestream_next_addr = place / CODESTREAM_BUFSIZ; | |
217 | codestream_next_addr *= CODESTREAM_BUFSIZ; | |
218 | codestream_cnt = 0; | |
219 | codestream_fill (1); | |
c5aa993b | 220 | while (codestream_tell () != place) |
c906108c SS |
221 | codestream_get (); |
222 | } | |
223 | ||
224 | static void | |
fba45db2 | 225 | codestream_read (unsigned char *buf, int count) |
c906108c SS |
226 | { |
227 | unsigned char *p; | |
228 | int i; | |
229 | p = buf; | |
230 | for (i = 0; i < count; i++) | |
231 | *p++ = codestream_get (); | |
232 | } | |
fc338970 | 233 | \f |
c906108c | 234 | |
fc338970 | 235 | /* If the next instruction is a jump, move to its target. */ |
c906108c SS |
236 | |
237 | static void | |
fba45db2 | 238 | i386_follow_jump (void) |
c906108c SS |
239 | { |
240 | unsigned char buf[4]; | |
241 | long delta; | |
242 | ||
243 | int data16; | |
244 | CORE_ADDR pos; | |
245 | ||
246 | pos = codestream_tell (); | |
247 | ||
248 | data16 = 0; | |
249 | if (codestream_peek () == 0x66) | |
250 | { | |
251 | codestream_get (); | |
252 | data16 = 1; | |
253 | } | |
254 | ||
255 | switch (codestream_get ()) | |
256 | { | |
257 | case 0xe9: | |
fc338970 | 258 | /* Relative jump: if data16 == 0, disp32, else disp16. */ |
c906108c SS |
259 | if (data16) |
260 | { | |
261 | codestream_read (buf, 2); | |
262 | delta = extract_signed_integer (buf, 2); | |
263 | ||
fc338970 MK |
264 | /* Include the size of the jmp instruction (including the |
265 | 0x66 prefix). */ | |
c5aa993b | 266 | pos += delta + 4; |
c906108c SS |
267 | } |
268 | else | |
269 | { | |
270 | codestream_read (buf, 4); | |
271 | delta = extract_signed_integer (buf, 4); | |
272 | ||
273 | pos += delta + 5; | |
274 | } | |
275 | break; | |
276 | case 0xeb: | |
fc338970 | 277 | /* Relative jump, disp8 (ignore data16). */ |
c906108c SS |
278 | codestream_read (buf, 1); |
279 | /* Sign-extend it. */ | |
280 | delta = extract_signed_integer (buf, 1); | |
281 | ||
282 | pos += delta + 2; | |
283 | break; | |
284 | } | |
285 | codestream_seek (pos); | |
286 | } | |
287 | ||
fc338970 MK |
288 | /* Find & return the amount a local space allocated, and advance the |
289 | codestream to the first register push (if any). | |
290 | ||
291 | If the entry sequence doesn't make sense, return -1, and leave | |
292 | codestream pointer at a random spot. */ | |
c906108c SS |
293 | |
294 | static long | |
fba45db2 | 295 | i386_get_frame_setup (CORE_ADDR pc) |
c906108c SS |
296 | { |
297 | unsigned char op; | |
298 | ||
299 | codestream_seek (pc); | |
300 | ||
301 | i386_follow_jump (); | |
302 | ||
303 | op = codestream_get (); | |
304 | ||
305 | if (op == 0x58) /* popl %eax */ | |
306 | { | |
fc338970 MK |
307 | /* This function must start with |
308 | ||
309 | popl %eax 0x58 | |
310 | xchgl %eax, (%esp) 0x87 0x04 0x24 | |
311 | or xchgl %eax, 0(%esp) 0x87 0x44 0x24 0x00 | |
312 | ||
313 | (the System V compiler puts out the second `xchg' | |
314 | instruction, and the assembler doesn't try to optimize it, so | |
315 | the 'sib' form gets generated). This sequence is used to get | |
316 | the address of the return buffer for a function that returns | |
317 | a structure. */ | |
c906108c SS |
318 | int pos; |
319 | unsigned char buf[4]; | |
fc338970 MK |
320 | static unsigned char proto1[3] = { 0x87, 0x04, 0x24 }; |
321 | static unsigned char proto2[4] = { 0x87, 0x44, 0x24, 0x00 }; | |
322 | ||
c906108c SS |
323 | pos = codestream_tell (); |
324 | codestream_read (buf, 4); | |
325 | if (memcmp (buf, proto1, 3) == 0) | |
326 | pos += 3; | |
327 | else if (memcmp (buf, proto2, 4) == 0) | |
328 | pos += 4; | |
329 | ||
330 | codestream_seek (pos); | |
fc338970 | 331 | op = codestream_get (); /* Update next opcode. */ |
c906108c SS |
332 | } |
333 | ||
334 | if (op == 0x68 || op == 0x6a) | |
335 | { | |
fc338970 MK |
336 | /* This function may start with |
337 | ||
338 | pushl constant | |
339 | call _probe | |
340 | addl $4, %esp | |
341 | ||
342 | followed by | |
343 | ||
344 | pushl %ebp | |
345 | ||
346 | etc. */ | |
c906108c SS |
347 | int pos; |
348 | unsigned char buf[8]; | |
349 | ||
fc338970 | 350 | /* Skip past the `pushl' instruction; it has either a one-byte |
c906108c SS |
351 | or a four-byte operand, depending on the opcode. */ |
352 | pos = codestream_tell (); | |
353 | if (op == 0x68) | |
354 | pos += 4; | |
355 | else | |
356 | pos += 1; | |
357 | codestream_seek (pos); | |
358 | ||
fc338970 MK |
359 | /* Read the following 8 bytes, which should be "call _probe" (6 |
360 | bytes) followed by "addl $4,%esp" (2 bytes). */ | |
c906108c SS |
361 | codestream_read (buf, sizeof (buf)); |
362 | if (buf[0] == 0xe8 && buf[6] == 0xc4 && buf[7] == 0x4) | |
363 | pos += sizeof (buf); | |
364 | codestream_seek (pos); | |
fc338970 | 365 | op = codestream_get (); /* Update next opcode. */ |
c906108c SS |
366 | } |
367 | ||
368 | if (op == 0x55) /* pushl %ebp */ | |
c5aa993b | 369 | { |
fc338970 | 370 | /* Check for "movl %esp, %ebp" -- can be written in two ways. */ |
c906108c SS |
371 | switch (codestream_get ()) |
372 | { | |
373 | case 0x8b: | |
374 | if (codestream_get () != 0xec) | |
fc338970 | 375 | return -1; |
c906108c SS |
376 | break; |
377 | case 0x89: | |
378 | if (codestream_get () != 0xe5) | |
fc338970 | 379 | return -1; |
c906108c SS |
380 | break; |
381 | default: | |
fc338970 | 382 | return -1; |
c906108c | 383 | } |
fc338970 MK |
384 | /* Check for stack adjustment |
385 | ||
386 | subl $XXX, %esp | |
387 | ||
388 | NOTE: You can't subtract a 16 bit immediate from a 32 bit | |
389 | reg, so we don't have to worry about a data16 prefix. */ | |
c906108c SS |
390 | op = codestream_peek (); |
391 | if (op == 0x83) | |
392 | { | |
fc338970 | 393 | /* `subl' with 8 bit immediate. */ |
c906108c SS |
394 | codestream_get (); |
395 | if (codestream_get () != 0xec) | |
fc338970 | 396 | /* Some instruction starting with 0x83 other than `subl'. */ |
c906108c SS |
397 | { |
398 | codestream_seek (codestream_tell () - 2); | |
399 | return 0; | |
400 | } | |
fc338970 MK |
401 | /* `subl' with signed byte immediate (though it wouldn't |
402 | make sense to be negative). */ | |
c5aa993b | 403 | return (codestream_get ()); |
c906108c SS |
404 | } |
405 | else if (op == 0x81) | |
406 | { | |
407 | char buf[4]; | |
fc338970 | 408 | /* Maybe it is `subl' with a 32 bit immedediate. */ |
c5aa993b | 409 | codestream_get (); |
c906108c | 410 | if (codestream_get () != 0xec) |
fc338970 | 411 | /* Some instruction starting with 0x81 other than `subl'. */ |
c906108c SS |
412 | { |
413 | codestream_seek (codestream_tell () - 2); | |
414 | return 0; | |
415 | } | |
fc338970 | 416 | /* It is `subl' with a 32 bit immediate. */ |
c5aa993b | 417 | codestream_read ((unsigned char *) buf, 4); |
c906108c SS |
418 | return extract_signed_integer (buf, 4); |
419 | } | |
420 | else | |
421 | { | |
fc338970 | 422 | return 0; |
c906108c SS |
423 | } |
424 | } | |
425 | else if (op == 0xc8) | |
426 | { | |
427 | char buf[2]; | |
fc338970 | 428 | /* `enter' with 16 bit unsigned immediate. */ |
c5aa993b | 429 | codestream_read ((unsigned char *) buf, 2); |
fc338970 | 430 | codestream_get (); /* Flush final byte of enter instruction. */ |
c906108c SS |
431 | return extract_unsigned_integer (buf, 2); |
432 | } | |
433 | return (-1); | |
434 | } | |
435 | ||
6bff26de MK |
436 | /* Signal trampolines don't have a meaningful frame. The frame |
437 | pointer value we use is actually the frame pointer of the calling | |
438 | frame -- that is, the frame which was in progress when the signal | |
439 | trampoline was entered. GDB mostly treats this frame pointer value | |
440 | as a magic cookie. We detect the case of a signal trampoline by | |
441 | looking at the SIGNAL_HANDLER_CALLER field, which is set based on | |
442 | PC_IN_SIGTRAMP. | |
443 | ||
444 | When a signal trampoline is invoked from a frameless function, we | |
445 | essentially have two frameless functions in a row. In this case, | |
446 | we use the same magic cookie for three frames in a row. We detect | |
447 | this case by seeing whether the next frame has | |
448 | SIGNAL_HANDLER_CALLER set, and, if it does, checking whether the | |
449 | current frame is actually frameless. In this case, we need to get | |
450 | the PC by looking at the SP register value stored in the signal | |
451 | context. | |
452 | ||
453 | This should work in most cases except in horrible situations where | |
454 | a signal occurs just as we enter a function but before the frame | |
c0d1d883 MK |
455 | has been set up. Incidentally, that's just what happens when we |
456 | call a function from GDB with a signal pending (there's a test in | |
457 | the testsuite that makes this happen). Therefore we pretend that | |
458 | we have a frameless function if we're stopped at the start of a | |
459 | function. */ | |
6bff26de MK |
460 | |
461 | /* Return non-zero if we're dealing with a frameless signal, that is, | |
462 | a signal trampoline invoked from a frameless function. */ | |
463 | ||
464 | static int | |
465 | i386_frameless_signal_p (struct frame_info *frame) | |
466 | { | |
c0d1d883 MK |
467 | return (frame->next && frame->next->signal_handler_caller |
468 | && (frameless_look_for_prologue (frame) | |
469 | || frame->pc == get_pc_function_start (frame->pc))); | |
6bff26de MK |
470 | } |
471 | ||
c833a37e MK |
472 | /* Return the chain-pointer for FRAME. In the case of the i386, the |
473 | frame's nominal address is the address of a 4-byte word containing | |
474 | the calling frame's address. */ | |
475 | ||
8201327c | 476 | static CORE_ADDR |
c833a37e MK |
477 | i386_frame_chain (struct frame_info *frame) |
478 | { | |
c0d1d883 MK |
479 | if (PC_IN_CALL_DUMMY (frame->pc, 0, 0)) |
480 | return frame->frame; | |
481 | ||
6bff26de MK |
482 | if (frame->signal_handler_caller |
483 | || i386_frameless_signal_p (frame)) | |
c833a37e MK |
484 | return frame->frame; |
485 | ||
486 | if (! inside_entry_file (frame->pc)) | |
487 | return read_memory_unsigned_integer (frame->frame, 4); | |
488 | ||
489 | return 0; | |
490 | } | |
491 | ||
539ffe0b MK |
492 | /* Determine whether the function invocation represented by FRAME does |
493 | not have a from on the stack associated with it. If it does not, | |
494 | return non-zero, otherwise return zero. */ | |
495 | ||
3a1e71e3 | 496 | static int |
539ffe0b MK |
497 | i386_frameless_function_invocation (struct frame_info *frame) |
498 | { | |
499 | if (frame->signal_handler_caller) | |
500 | return 0; | |
501 | ||
502 | return frameless_look_for_prologue (frame); | |
503 | } | |
504 | ||
21d0e8a4 MK |
505 | /* Assuming FRAME is for a sigtramp routine, return the saved program |
506 | counter. */ | |
507 | ||
508 | static CORE_ADDR | |
509 | i386_sigtramp_saved_pc (struct frame_info *frame) | |
510 | { | |
511 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
512 | CORE_ADDR addr; | |
513 | ||
514 | addr = tdep->sigcontext_addr (frame); | |
515 | return read_memory_unsigned_integer (addr + tdep->sc_pc_offset, 4); | |
516 | } | |
517 | ||
6bff26de MK |
518 | /* Assuming FRAME is for a sigtramp routine, return the saved stack |
519 | pointer. */ | |
520 | ||
521 | static CORE_ADDR | |
522 | i386_sigtramp_saved_sp (struct frame_info *frame) | |
523 | { | |
524 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
525 | CORE_ADDR addr; | |
526 | ||
527 | addr = tdep->sigcontext_addr (frame); | |
528 | return read_memory_unsigned_integer (addr + tdep->sc_sp_offset, 4); | |
529 | } | |
530 | ||
0d17c81d MK |
531 | /* Return the saved program counter for FRAME. */ |
532 | ||
8201327c | 533 | static CORE_ADDR |
0d17c81d MK |
534 | i386_frame_saved_pc (struct frame_info *frame) |
535 | { | |
c0d1d883 MK |
536 | if (PC_IN_CALL_DUMMY (frame->pc, 0, 0)) |
537 | return generic_read_register_dummy (frame->pc, frame->frame, | |
538 | PC_REGNUM); | |
539 | ||
0d17c81d | 540 | if (frame->signal_handler_caller) |
21d0e8a4 | 541 | return i386_sigtramp_saved_pc (frame); |
0d17c81d | 542 | |
6bff26de MK |
543 | if (i386_frameless_signal_p (frame)) |
544 | { | |
545 | CORE_ADDR sp = i386_sigtramp_saved_sp (frame->next); | |
546 | return read_memory_unsigned_integer (sp, 4); | |
547 | } | |
548 | ||
8201327c | 549 | return read_memory_unsigned_integer (frame->frame + 4, 4); |
22797942 AC |
550 | } |
551 | ||
ed84f6c1 MK |
552 | /* Immediately after a function call, return the saved pc. */ |
553 | ||
8201327c | 554 | static CORE_ADDR |
ed84f6c1 MK |
555 | i386_saved_pc_after_call (struct frame_info *frame) |
556 | { | |
6bff26de MK |
557 | if (frame->signal_handler_caller) |
558 | return i386_sigtramp_saved_pc (frame); | |
559 | ||
ed84f6c1 MK |
560 | return read_memory_unsigned_integer (read_register (SP_REGNUM), 4); |
561 | } | |
562 | ||
c906108c SS |
563 | /* Return number of args passed to a frame. |
564 | Can return -1, meaning no way to tell. */ | |
565 | ||
3a1e71e3 | 566 | static int |
fba45db2 | 567 | i386_frame_num_args (struct frame_info *fi) |
c906108c SS |
568 | { |
569 | #if 1 | |
570 | return -1; | |
571 | #else | |
572 | /* This loses because not only might the compiler not be popping the | |
fc338970 MK |
573 | args right after the function call, it might be popping args from |
574 | both this call and a previous one, and we would say there are | |
575 | more args than there really are. */ | |
c906108c | 576 | |
c5aa993b JM |
577 | int retpc; |
578 | unsigned char op; | |
c906108c SS |
579 | struct frame_info *pfi; |
580 | ||
fc338970 | 581 | /* On the i386, the instruction following the call could be: |
c906108c SS |
582 | popl %ecx - one arg |
583 | addl $imm, %esp - imm/4 args; imm may be 8 or 32 bits | |
fc338970 | 584 | anything else - zero args. */ |
c906108c SS |
585 | |
586 | int frameless; | |
587 | ||
392a587b | 588 | frameless = FRAMELESS_FUNCTION_INVOCATION (fi); |
c906108c | 589 | if (frameless) |
fc338970 MK |
590 | /* In the absence of a frame pointer, GDB doesn't get correct |
591 | values for nameless arguments. Return -1, so it doesn't print | |
592 | any nameless arguments. */ | |
c906108c SS |
593 | return -1; |
594 | ||
c5aa993b | 595 | pfi = get_prev_frame (fi); |
c906108c SS |
596 | if (pfi == 0) |
597 | { | |
fc338970 MK |
598 | /* NOTE: This can happen if we are looking at the frame for |
599 | main, because FRAME_CHAIN_VALID won't let us go into start. | |
600 | If we have debugging symbols, that's not really a big deal; | |
601 | it just means it will only show as many arguments to main as | |
602 | are declared. */ | |
c906108c SS |
603 | return -1; |
604 | } | |
605 | else | |
606 | { | |
c5aa993b JM |
607 | retpc = pfi->pc; |
608 | op = read_memory_integer (retpc, 1); | |
fc338970 | 609 | if (op == 0x59) /* pop %ecx */ |
c5aa993b | 610 | return 1; |
c906108c SS |
611 | else if (op == 0x83) |
612 | { | |
c5aa993b JM |
613 | op = read_memory_integer (retpc + 1, 1); |
614 | if (op == 0xc4) | |
615 | /* addl $<signed imm 8 bits>, %esp */ | |
616 | return (read_memory_integer (retpc + 2, 1) & 0xff) / 4; | |
c906108c SS |
617 | else |
618 | return 0; | |
619 | } | |
fc338970 MK |
620 | else if (op == 0x81) /* `add' with 32 bit immediate. */ |
621 | { | |
c5aa993b JM |
622 | op = read_memory_integer (retpc + 1, 1); |
623 | if (op == 0xc4) | |
624 | /* addl $<imm 32>, %esp */ | |
625 | return read_memory_integer (retpc + 2, 4) / 4; | |
c906108c SS |
626 | else |
627 | return 0; | |
628 | } | |
629 | else | |
630 | { | |
631 | return 0; | |
632 | } | |
633 | } | |
634 | #endif | |
635 | } | |
636 | ||
fc338970 MK |
637 | /* Parse the first few instructions the function to see what registers |
638 | were stored. | |
639 | ||
640 | We handle these cases: | |
641 | ||
642 | The startup sequence can be at the start of the function, or the | |
643 | function can start with a branch to startup code at the end. | |
644 | ||
645 | %ebp can be set up with either the 'enter' instruction, or "pushl | |
646 | %ebp, movl %esp, %ebp" (`enter' is too slow to be useful, but was | |
647 | once used in the System V compiler). | |
648 | ||
649 | Local space is allocated just below the saved %ebp by either the | |
650 | 'enter' instruction, or by "subl $<size>, %esp". 'enter' has a 16 | |
651 | bit unsigned argument for space to allocate, and the 'addl' | |
652 | instruction could have either a signed byte, or 32 bit immediate. | |
653 | ||
654 | Next, the registers used by this function are pushed. With the | |
655 | System V compiler they will always be in the order: %edi, %esi, | |
656 | %ebx (and sometimes a harmless bug causes it to also save but not | |
657 | restore %eax); however, the code below is willing to see the pushes | |
658 | in any order, and will handle up to 8 of them. | |
659 | ||
660 | If the setup sequence is at the end of the function, then the next | |
661 | instruction will be a branch back to the start. */ | |
c906108c | 662 | |
3a1e71e3 | 663 | static void |
fba45db2 | 664 | i386_frame_init_saved_regs (struct frame_info *fip) |
c906108c SS |
665 | { |
666 | long locals = -1; | |
667 | unsigned char op; | |
fc338970 | 668 | CORE_ADDR addr; |
c906108c SS |
669 | CORE_ADDR pc; |
670 | int i; | |
c5aa993b | 671 | |
1211c4e4 AC |
672 | if (fip->saved_regs) |
673 | return; | |
674 | ||
675 | frame_saved_regs_zalloc (fip); | |
c5aa993b | 676 | |
c906108c SS |
677 | pc = get_pc_function_start (fip->pc); |
678 | if (pc != 0) | |
679 | locals = i386_get_frame_setup (pc); | |
c5aa993b JM |
680 | |
681 | if (locals >= 0) | |
c906108c | 682 | { |
fc338970 | 683 | addr = fip->frame - 4 - locals; |
c5aa993b | 684 | for (i = 0; i < 8; i++) |
c906108c SS |
685 | { |
686 | op = codestream_get (); | |
687 | if (op < 0x50 || op > 0x57) | |
688 | break; | |
689 | #ifdef I386_REGNO_TO_SYMMETRY | |
690 | /* Dynix uses different internal numbering. Ick. */ | |
fc338970 | 691 | fip->saved_regs[I386_REGNO_TO_SYMMETRY (op - 0x50)] = addr; |
c906108c | 692 | #else |
fc338970 | 693 | fip->saved_regs[op - 0x50] = addr; |
c906108c | 694 | #endif |
fc338970 | 695 | addr -= 4; |
c906108c SS |
696 | } |
697 | } | |
c5aa993b | 698 | |
1211c4e4 AC |
699 | fip->saved_regs[PC_REGNUM] = fip->frame + 4; |
700 | fip->saved_regs[FP_REGNUM] = fip->frame; | |
c906108c SS |
701 | } |
702 | ||
fc338970 | 703 | /* Return PC of first real instruction. */ |
c906108c | 704 | |
3a1e71e3 | 705 | static CORE_ADDR |
93924b6b | 706 | i386_skip_prologue (CORE_ADDR pc) |
c906108c SS |
707 | { |
708 | unsigned char op; | |
709 | int i; | |
c5aa993b | 710 | static unsigned char pic_pat[6] = |
fc338970 MK |
711 | { 0xe8, 0, 0, 0, 0, /* call 0x0 */ |
712 | 0x5b, /* popl %ebx */ | |
c5aa993b | 713 | }; |
c906108c | 714 | CORE_ADDR pos; |
c5aa993b | 715 | |
c906108c SS |
716 | if (i386_get_frame_setup (pc) < 0) |
717 | return (pc); | |
c5aa993b | 718 | |
fc338970 MK |
719 | /* Found valid frame setup -- codestream now points to start of push |
720 | instructions for saving registers. */ | |
c5aa993b | 721 | |
fc338970 | 722 | /* Skip over register saves. */ |
c906108c SS |
723 | for (i = 0; i < 8; i++) |
724 | { | |
725 | op = codestream_peek (); | |
fc338970 | 726 | /* Break if not `pushl' instrunction. */ |
c5aa993b | 727 | if (op < 0x50 || op > 0x57) |
c906108c SS |
728 | break; |
729 | codestream_get (); | |
730 | } | |
731 | ||
fc338970 MK |
732 | /* The native cc on SVR4 in -K PIC mode inserts the following code |
733 | to get the address of the global offset table (GOT) into register | |
734 | %ebx | |
735 | ||
736 | call 0x0 | |
737 | popl %ebx | |
738 | movl %ebx,x(%ebp) (optional) | |
739 | addl y,%ebx | |
740 | ||
c906108c SS |
741 | This code is with the rest of the prologue (at the end of the |
742 | function), so we have to skip it to get to the first real | |
743 | instruction at the start of the function. */ | |
c5aa993b | 744 | |
c906108c SS |
745 | pos = codestream_tell (); |
746 | for (i = 0; i < 6; i++) | |
747 | { | |
748 | op = codestream_get (); | |
c5aa993b | 749 | if (pic_pat[i] != op) |
c906108c SS |
750 | break; |
751 | } | |
752 | if (i == 6) | |
753 | { | |
754 | unsigned char buf[4]; | |
755 | long delta = 6; | |
756 | ||
757 | op = codestream_get (); | |
c5aa993b | 758 | if (op == 0x89) /* movl %ebx, x(%ebp) */ |
c906108c SS |
759 | { |
760 | op = codestream_get (); | |
fc338970 | 761 | if (op == 0x5d) /* One byte offset from %ebp. */ |
c906108c SS |
762 | { |
763 | delta += 3; | |
764 | codestream_read (buf, 1); | |
765 | } | |
fc338970 | 766 | else if (op == 0x9d) /* Four byte offset from %ebp. */ |
c906108c SS |
767 | { |
768 | delta += 6; | |
769 | codestream_read (buf, 4); | |
770 | } | |
fc338970 | 771 | else /* Unexpected instruction. */ |
c5aa993b JM |
772 | delta = -1; |
773 | op = codestream_get (); | |
c906108c | 774 | } |
c5aa993b JM |
775 | /* addl y,%ebx */ |
776 | if (delta > 0 && op == 0x81 && codestream_get () == 0xc3) | |
c906108c | 777 | { |
c5aa993b | 778 | pos += delta + 6; |
c906108c SS |
779 | } |
780 | } | |
781 | codestream_seek (pos); | |
c5aa993b | 782 | |
c906108c | 783 | i386_follow_jump (); |
c5aa993b | 784 | |
c906108c SS |
785 | return (codestream_tell ()); |
786 | } | |
787 | ||
93924b6b MK |
788 | /* Use the program counter to determine the contents and size of a |
789 | breakpoint instruction. Return a pointer to a string of bytes that | |
790 | encode a breakpoint instruction, store the length of the string in | |
791 | *LEN and optionally adjust *PC to point to the correct memory | |
792 | location for inserting the breakpoint. | |
793 | ||
794 | On the i386 we have a single breakpoint that fits in a single byte | |
795 | and can be inserted anywhere. */ | |
796 | ||
797 | static const unsigned char * | |
798 | i386_breakpoint_from_pc (CORE_ADDR *pc, int *len) | |
799 | { | |
800 | static unsigned char break_insn[] = { 0xcc }; /* int 3 */ | |
801 | ||
802 | *len = sizeof (break_insn); | |
803 | return break_insn; | |
804 | } | |
805 | ||
c0d1d883 MK |
806 | /* Push the return address (pointing to the call dummy) onto the stack |
807 | and return the new value for the stack pointer. */ | |
c5aa993b | 808 | |
c0d1d883 MK |
809 | static CORE_ADDR |
810 | i386_push_return_address (CORE_ADDR pc, CORE_ADDR sp) | |
a7769679 | 811 | { |
c0d1d883 | 812 | char buf[4]; |
a7769679 | 813 | |
c0d1d883 MK |
814 | store_unsigned_integer (buf, 4, CALL_DUMMY_ADDRESS ()); |
815 | write_memory (sp - 4, buf, 4); | |
816 | return sp - 4; | |
a7769679 MK |
817 | } |
818 | ||
3a1e71e3 | 819 | static void |
c0d1d883 | 820 | i386_do_pop_frame (struct frame_info *frame) |
c906108c | 821 | { |
c906108c SS |
822 | CORE_ADDR fp; |
823 | int regnum; | |
00f8375e | 824 | char regbuf[I386_MAX_REGISTER_SIZE]; |
c5aa993b | 825 | |
c906108c | 826 | fp = FRAME_FP (frame); |
1211c4e4 AC |
827 | i386_frame_init_saved_regs (frame); |
828 | ||
c5aa993b | 829 | for (regnum = 0; regnum < NUM_REGS; regnum++) |
c906108c | 830 | { |
fc338970 MK |
831 | CORE_ADDR addr; |
832 | addr = frame->saved_regs[regnum]; | |
833 | if (addr) | |
c906108c | 834 | { |
fc338970 | 835 | read_memory (addr, regbuf, REGISTER_RAW_SIZE (regnum)); |
c2848c82 | 836 | write_register_gen (regnum, regbuf); |
c906108c SS |
837 | } |
838 | } | |
839 | write_register (FP_REGNUM, read_memory_integer (fp, 4)); | |
840 | write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); | |
841 | write_register (SP_REGNUM, fp + 8); | |
842 | flush_cached_frames (); | |
843 | } | |
c0d1d883 MK |
844 | |
845 | static void | |
846 | i386_pop_frame (void) | |
847 | { | |
848 | generic_pop_current_frame (i386_do_pop_frame); | |
849 | } | |
fc338970 | 850 | \f |
c906108c | 851 | |
fc338970 MK |
852 | /* Figure out where the longjmp will land. Slurp the args out of the |
853 | stack. We expect the first arg to be a pointer to the jmp_buf | |
8201327c MK |
854 | structure from which we extract the address that we will land at. |
855 | This address is copied into PC. This routine returns true on | |
fc338970 | 856 | success. */ |
c906108c | 857 | |
8201327c MK |
858 | static int |
859 | i386_get_longjmp_target (CORE_ADDR *pc) | |
c906108c | 860 | { |
8201327c | 861 | char buf[4]; |
c906108c | 862 | CORE_ADDR sp, jb_addr; |
8201327c | 863 | int jb_pc_offset = gdbarch_tdep (current_gdbarch)->jb_pc_offset; |
c906108c | 864 | |
8201327c MK |
865 | /* If JB_PC_OFFSET is -1, we have no way to find out where the |
866 | longjmp will land. */ | |
867 | if (jb_pc_offset == -1) | |
c906108c SS |
868 | return 0; |
869 | ||
8201327c MK |
870 | sp = read_register (SP_REGNUM); |
871 | if (target_read_memory (sp + 4, buf, 4)) | |
c906108c SS |
872 | return 0; |
873 | ||
8201327c MK |
874 | jb_addr = extract_address (buf, 4); |
875 | if (target_read_memory (jb_addr + jb_pc_offset, buf, 4)) | |
876 | return 0; | |
c906108c | 877 | |
8201327c | 878 | *pc = extract_address (buf, 4); |
c906108c SS |
879 | return 1; |
880 | } | |
fc338970 | 881 | \f |
c906108c | 882 | |
3a1e71e3 | 883 | static CORE_ADDR |
ea7c478f | 884 | i386_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
22f8ba57 MK |
885 | int struct_return, CORE_ADDR struct_addr) |
886 | { | |
887 | sp = default_push_arguments (nargs, args, sp, struct_return, struct_addr); | |
888 | ||
889 | if (struct_return) | |
890 | { | |
891 | char buf[4]; | |
892 | ||
893 | sp -= 4; | |
894 | store_address (buf, 4, struct_addr); | |
895 | write_memory (sp, buf, 4); | |
896 | } | |
897 | ||
898 | return sp; | |
899 | } | |
900 | ||
3a1e71e3 | 901 | static void |
22f8ba57 MK |
902 | i386_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
903 | { | |
904 | /* Do nothing. Everything was already done by i386_push_arguments. */ | |
905 | } | |
906 | ||
1a309862 MK |
907 | /* These registers are used for returning integers (and on some |
908 | targets also for returning `struct' and `union' values when their | |
ef9dff19 | 909 | size and alignment match an integer type). */ |
1a309862 MK |
910 | #define LOW_RETURN_REGNUM 0 /* %eax */ |
911 | #define HIGH_RETURN_REGNUM 2 /* %edx */ | |
912 | ||
913 | /* Extract from an array REGBUF containing the (raw) register state, a | |
914 | function return value of TYPE, and copy that, in virtual format, | |
915 | into VALBUF. */ | |
916 | ||
3a1e71e3 | 917 | static void |
00f8375e MK |
918 | i386_extract_return_value (struct type *type, struct regcache *regcache, |
919 | char *valbuf) | |
c906108c | 920 | { |
1a309862 | 921 | int len = TYPE_LENGTH (type); |
00f8375e | 922 | char buf[I386_MAX_REGISTER_SIZE]; |
1a309862 | 923 | |
1e8d0a7b MK |
924 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
925 | && TYPE_NFIELDS (type) == 1) | |
3df1b9b4 | 926 | { |
00f8375e | 927 | i386_extract_return_value (TYPE_FIELD_TYPE (type, 0), regcache, valbuf); |
3df1b9b4 MK |
928 | return; |
929 | } | |
1e8d0a7b MK |
930 | |
931 | if (TYPE_CODE (type) == TYPE_CODE_FLT) | |
c906108c | 932 | { |
356a6b3e | 933 | if (FP0_REGNUM == 0) |
1a309862 MK |
934 | { |
935 | warning ("Cannot find floating-point return value."); | |
936 | memset (valbuf, 0, len); | |
ef9dff19 | 937 | return; |
1a309862 MK |
938 | } |
939 | ||
c6ba6f0d MK |
940 | /* Floating-point return values can be found in %st(0). Convert |
941 | its contents to the desired type. This is probably not | |
942 | exactly how it would happen on the target itself, but it is | |
943 | the best we can do. */ | |
0818c12a | 944 | regcache_raw_read (regcache, FP0_REGNUM, buf); |
00f8375e | 945 | convert_typed_floating (buf, builtin_type_i387_ext, valbuf, type); |
c906108c SS |
946 | } |
947 | else | |
c5aa993b | 948 | { |
d4f3574e SS |
949 | int low_size = REGISTER_RAW_SIZE (LOW_RETURN_REGNUM); |
950 | int high_size = REGISTER_RAW_SIZE (HIGH_RETURN_REGNUM); | |
951 | ||
952 | if (len <= low_size) | |
00f8375e | 953 | { |
0818c12a | 954 | regcache_raw_read (regcache, LOW_RETURN_REGNUM, buf); |
00f8375e MK |
955 | memcpy (valbuf, buf, len); |
956 | } | |
d4f3574e SS |
957 | else if (len <= (low_size + high_size)) |
958 | { | |
0818c12a | 959 | regcache_raw_read (regcache, LOW_RETURN_REGNUM, buf); |
00f8375e | 960 | memcpy (valbuf, buf, low_size); |
0818c12a | 961 | regcache_raw_read (regcache, HIGH_RETURN_REGNUM, buf); |
00f8375e | 962 | memcpy (valbuf + low_size, buf, len - low_size); |
d4f3574e SS |
963 | } |
964 | else | |
8e65ff28 AC |
965 | internal_error (__FILE__, __LINE__, |
966 | "Cannot extract return value of %d bytes long.", len); | |
c906108c SS |
967 | } |
968 | } | |
969 | ||
ef9dff19 MK |
970 | /* Write into the appropriate registers a function return value stored |
971 | in VALBUF of type TYPE, given in virtual format. */ | |
972 | ||
3a1e71e3 | 973 | static void |
ef9dff19 MK |
974 | i386_store_return_value (struct type *type, char *valbuf) |
975 | { | |
976 | int len = TYPE_LENGTH (type); | |
977 | ||
1e8d0a7b MK |
978 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
979 | && TYPE_NFIELDS (type) == 1) | |
3df1b9b4 MK |
980 | { |
981 | i386_store_return_value (TYPE_FIELD_TYPE (type, 0), valbuf); | |
982 | return; | |
983 | } | |
1e8d0a7b MK |
984 | |
985 | if (TYPE_CODE (type) == TYPE_CODE_FLT) | |
ef9dff19 | 986 | { |
ccb945b8 | 987 | unsigned int fstat; |
c6ba6f0d | 988 | char buf[FPU_REG_RAW_SIZE]; |
ccb945b8 | 989 | |
356a6b3e | 990 | if (FP0_REGNUM == 0) |
ef9dff19 MK |
991 | { |
992 | warning ("Cannot set floating-point return value."); | |
993 | return; | |
994 | } | |
995 | ||
635b0cc1 MK |
996 | /* Returning floating-point values is a bit tricky. Apart from |
997 | storing the return value in %st(0), we have to simulate the | |
998 | state of the FPU at function return point. */ | |
999 | ||
c6ba6f0d MK |
1000 | /* Convert the value found in VALBUF to the extended |
1001 | floating-point format used by the FPU. This is probably | |
1002 | not exactly how it would happen on the target itself, but | |
1003 | it is the best we can do. */ | |
1004 | convert_typed_floating (valbuf, type, buf, builtin_type_i387_ext); | |
c2848c82 | 1005 | write_register_gen (FP0_REGNUM, buf); |
ccb945b8 | 1006 | |
635b0cc1 MK |
1007 | /* Set the top of the floating-point register stack to 7. The |
1008 | actual value doesn't really matter, but 7 is what a normal | |
1009 | function return would end up with if the program started out | |
1010 | with a freshly initialized FPU. */ | |
ccb945b8 MK |
1011 | fstat = read_register (FSTAT_REGNUM); |
1012 | fstat |= (7 << 11); | |
1013 | write_register (FSTAT_REGNUM, fstat); | |
1014 | ||
635b0cc1 MK |
1015 | /* Mark %st(1) through %st(7) as empty. Since we set the top of |
1016 | the floating-point register stack to 7, the appropriate value | |
1017 | for the tag word is 0x3fff. */ | |
ccb945b8 | 1018 | write_register (FTAG_REGNUM, 0x3fff); |
ef9dff19 MK |
1019 | } |
1020 | else | |
1021 | { | |
1022 | int low_size = REGISTER_RAW_SIZE (LOW_RETURN_REGNUM); | |
1023 | int high_size = REGISTER_RAW_SIZE (HIGH_RETURN_REGNUM); | |
1024 | ||
1025 | if (len <= low_size) | |
1026 | write_register_bytes (REGISTER_BYTE (LOW_RETURN_REGNUM), valbuf, len); | |
1027 | else if (len <= (low_size + high_size)) | |
1028 | { | |
1029 | write_register_bytes (REGISTER_BYTE (LOW_RETURN_REGNUM), | |
1030 | valbuf, low_size); | |
1031 | write_register_bytes (REGISTER_BYTE (HIGH_RETURN_REGNUM), | |
1032 | valbuf + low_size, len - low_size); | |
1033 | } | |
1034 | else | |
8e65ff28 AC |
1035 | internal_error (__FILE__, __LINE__, |
1036 | "Cannot store return value of %d bytes long.", len); | |
ef9dff19 MK |
1037 | } |
1038 | } | |
f7af9647 MK |
1039 | |
1040 | /* Extract from an array REGBUF containing the (raw) register state | |
1041 | the address in which a function should return its structure value, | |
1042 | as a CORE_ADDR. */ | |
1043 | ||
3a1e71e3 | 1044 | static CORE_ADDR |
00f8375e | 1045 | i386_extract_struct_value_address (struct regcache *regcache) |
f7af9647 | 1046 | { |
a378f419 AC |
1047 | /* NOTE: cagney/2002-08-12: Replaced a call to |
1048 | regcache_raw_read_as_address() with a call to | |
1049 | regcache_cooked_read_unsigned(). The old, ...as_address function | |
1050 | was eventually calling extract_unsigned_integer (via | |
1051 | extract_address) to unpack the registers value. The below is | |
1052 | doing an unsigned extract so that it is functionally equivalent. | |
1053 | The read needs to be cooked as, otherwise, it will never | |
1054 | correctly return the value of a register in the [NUM_REGS | |
1055 | .. NUM_REGS+NUM_PSEUDO_REGS) range. */ | |
1056 | ULONGEST val; | |
1057 | regcache_cooked_read_unsigned (regcache, LOW_RETURN_REGNUM, &val); | |
1058 | return val; | |
f7af9647 | 1059 | } |
fc338970 | 1060 | \f |
ef9dff19 | 1061 | |
8201327c MK |
1062 | /* This is the variable that is set with "set struct-convention", and |
1063 | its legitimate values. */ | |
1064 | static const char default_struct_convention[] = "default"; | |
1065 | static const char pcc_struct_convention[] = "pcc"; | |
1066 | static const char reg_struct_convention[] = "reg"; | |
1067 | static const char *valid_conventions[] = | |
1068 | { | |
1069 | default_struct_convention, | |
1070 | pcc_struct_convention, | |
1071 | reg_struct_convention, | |
1072 | NULL | |
1073 | }; | |
1074 | static const char *struct_convention = default_struct_convention; | |
1075 | ||
1076 | static int | |
1077 | i386_use_struct_convention (int gcc_p, struct type *type) | |
1078 | { | |
1079 | enum struct_return struct_return; | |
1080 | ||
1081 | if (struct_convention == default_struct_convention) | |
1082 | struct_return = gdbarch_tdep (current_gdbarch)->struct_return; | |
1083 | else if (struct_convention == pcc_struct_convention) | |
1084 | struct_return = pcc_struct_return; | |
1085 | else | |
1086 | struct_return = reg_struct_return; | |
1087 | ||
1088 | return generic_use_struct_convention (struct_return == reg_struct_return, | |
1089 | type); | |
1090 | } | |
1091 | \f | |
1092 | ||
d7a0d72c MK |
1093 | /* Return the GDB type object for the "standard" data type of data in |
1094 | register REGNUM. Perhaps %esi and %edi should go here, but | |
1095 | potentially they could be used for things other than address. */ | |
1096 | ||
3a1e71e3 | 1097 | static struct type * |
d7a0d72c MK |
1098 | i386_register_virtual_type (int regnum) |
1099 | { | |
1100 | if (regnum == PC_REGNUM || regnum == FP_REGNUM || regnum == SP_REGNUM) | |
1101 | return lookup_pointer_type (builtin_type_void); | |
1102 | ||
1103 | if (IS_FP_REGNUM (regnum)) | |
c6ba6f0d | 1104 | return builtin_type_i387_ext; |
d7a0d72c MK |
1105 | |
1106 | if (IS_SSE_REGNUM (regnum)) | |
3139facc | 1107 | return builtin_type_vec128i; |
d7a0d72c | 1108 | |
28fc6740 AC |
1109 | if (mmx_regnum_p (regnum)) |
1110 | return builtin_type_vec64i; | |
1111 | ||
d7a0d72c MK |
1112 | return builtin_type_int; |
1113 | } | |
1114 | ||
28fc6740 AC |
1115 | /* Map a cooked register onto a raw register or memory. For the i386, |
1116 | the MMX registers need to be mapped onto floating point registers. */ | |
1117 | ||
1118 | static int | |
1119 | mmx_regnum_to_fp_regnum (struct regcache *regcache, int regnum) | |
1120 | { | |
1121 | int mmxi; | |
1122 | ULONGEST fstat; | |
1123 | int tos; | |
1124 | int fpi; | |
1125 | mmxi = regnum - MM0_REGNUM; | |
1126 | regcache_raw_read_unsigned (regcache, FSTAT_REGNUM, &fstat); | |
1127 | tos = (fstat >> 11) & 0x7; | |
1128 | fpi = (mmxi + tos) % 8; | |
1129 | return (FP0_REGNUM + fpi); | |
1130 | } | |
1131 | ||
1132 | static void | |
1133 | i386_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache, | |
1134 | int regnum, void *buf) | |
1135 | { | |
1136 | if (mmx_regnum_p (regnum)) | |
1137 | { | |
1138 | char *mmx_buf = alloca (MAX_REGISTER_RAW_SIZE); | |
1139 | int fpnum = mmx_regnum_to_fp_regnum (regcache, regnum); | |
1140 | regcache_raw_read (regcache, fpnum, mmx_buf); | |
1141 | /* Extract (always little endian). */ | |
1142 | memcpy (buf, mmx_buf, REGISTER_RAW_SIZE (regnum)); | |
1143 | } | |
1144 | else | |
1145 | regcache_raw_read (regcache, regnum, buf); | |
1146 | } | |
1147 | ||
1148 | static void | |
1149 | i386_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache, | |
1150 | int regnum, const void *buf) | |
1151 | { | |
1152 | if (mmx_regnum_p (regnum)) | |
1153 | { | |
1154 | char *mmx_buf = alloca (MAX_REGISTER_RAW_SIZE); | |
1155 | int fpnum = mmx_regnum_to_fp_regnum (regcache, regnum); | |
1156 | /* Read ... */ | |
1157 | regcache_raw_read (regcache, fpnum, mmx_buf); | |
1158 | /* ... Modify ... (always little endian). */ | |
1159 | memcpy (mmx_buf, buf, REGISTER_RAW_SIZE (regnum)); | |
1160 | /* ... Write. */ | |
1161 | regcache_raw_write (regcache, fpnum, mmx_buf); | |
1162 | } | |
1163 | else | |
1164 | regcache_raw_write (regcache, regnum, buf); | |
1165 | } | |
1166 | ||
d7a0d72c MK |
1167 | /* Return true iff register REGNUM's virtual format is different from |
1168 | its raw format. Note that this definition assumes that the host | |
1169 | supports IEEE 32-bit floats, since it doesn't say that SSE | |
1170 | registers need conversion. Even if we can't find a counterexample, | |
1171 | this is still sloppy. */ | |
1172 | ||
3a1e71e3 | 1173 | static int |
d7a0d72c MK |
1174 | i386_register_convertible (int regnum) |
1175 | { | |
1176 | return IS_FP_REGNUM (regnum); | |
1177 | } | |
1178 | ||
ac27f131 | 1179 | /* Convert data from raw format for register REGNUM in buffer FROM to |
3d261580 | 1180 | virtual format with type TYPE in buffer TO. */ |
ac27f131 | 1181 | |
3a1e71e3 | 1182 | static void |
ac27f131 MK |
1183 | i386_register_convert_to_virtual (int regnum, struct type *type, |
1184 | char *from, char *to) | |
1185 | { | |
c6ba6f0d | 1186 | gdb_assert (IS_FP_REGNUM (regnum)); |
3d261580 MK |
1187 | |
1188 | /* We only support floating-point values. */ | |
8d7f6b4a MK |
1189 | if (TYPE_CODE (type) != TYPE_CODE_FLT) |
1190 | { | |
1191 | warning ("Cannot convert floating-point register value " | |
1192 | "to non-floating-point type."); | |
1193 | memset (to, 0, TYPE_LENGTH (type)); | |
1194 | return; | |
1195 | } | |
3d261580 | 1196 | |
c6ba6f0d MK |
1197 | /* Convert to TYPE. This should be a no-op if TYPE is equivalent to |
1198 | the extended floating-point format used by the FPU. */ | |
1199 | convert_typed_floating (from, builtin_type_i387_ext, to, type); | |
ac27f131 MK |
1200 | } |
1201 | ||
1202 | /* Convert data from virtual format with type TYPE in buffer FROM to | |
3d261580 | 1203 | raw format for register REGNUM in buffer TO. */ |
ac27f131 | 1204 | |
3a1e71e3 | 1205 | static void |
ac27f131 MK |
1206 | i386_register_convert_to_raw (struct type *type, int regnum, |
1207 | char *from, char *to) | |
1208 | { | |
c6ba6f0d MK |
1209 | gdb_assert (IS_FP_REGNUM (regnum)); |
1210 | ||
1211 | /* We only support floating-point values. */ | |
1212 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
1213 | { | |
1214 | warning ("Cannot convert non-floating-point type " | |
1215 | "to floating-point register value."); | |
1216 | memset (to, 0, TYPE_LENGTH (type)); | |
1217 | return; | |
1218 | } | |
3d261580 | 1219 | |
c6ba6f0d MK |
1220 | /* Convert from TYPE. This should be a no-op if TYPE is equivalent |
1221 | to the extended floating-point format used by the FPU. */ | |
1222 | convert_typed_floating (from, type, to, builtin_type_i387_ext); | |
ac27f131 | 1223 | } |
ac27f131 | 1224 | \f |
fc338970 | 1225 | |
c906108c | 1226 | #ifdef STATIC_TRANSFORM_NAME |
fc338970 MK |
1227 | /* SunPRO encodes the static variables. This is not related to C++ |
1228 | mangling, it is done for C too. */ | |
c906108c SS |
1229 | |
1230 | char * | |
fba45db2 | 1231 | sunpro_static_transform_name (char *name) |
c906108c SS |
1232 | { |
1233 | char *p; | |
1234 | if (IS_STATIC_TRANSFORM_NAME (name)) | |
1235 | { | |
fc338970 MK |
1236 | /* For file-local statics there will be a period, a bunch of |
1237 | junk (the contents of which match a string given in the | |
c5aa993b JM |
1238 | N_OPT), a period and the name. For function-local statics |
1239 | there will be a bunch of junk (which seems to change the | |
1240 | second character from 'A' to 'B'), a period, the name of the | |
1241 | function, and the name. So just skip everything before the | |
1242 | last period. */ | |
c906108c SS |
1243 | p = strrchr (name, '.'); |
1244 | if (p != NULL) | |
1245 | name = p + 1; | |
1246 | } | |
1247 | return name; | |
1248 | } | |
1249 | #endif /* STATIC_TRANSFORM_NAME */ | |
fc338970 | 1250 | \f |
c906108c | 1251 | |
fc338970 | 1252 | /* Stuff for WIN32 PE style DLL's but is pretty generic really. */ |
c906108c SS |
1253 | |
1254 | CORE_ADDR | |
1cce71eb | 1255 | i386_pe_skip_trampoline_code (CORE_ADDR pc, char *name) |
c906108c | 1256 | { |
fc338970 | 1257 | if (pc && read_memory_unsigned_integer (pc, 2) == 0x25ff) /* jmp *(dest) */ |
c906108c | 1258 | { |
c5aa993b | 1259 | unsigned long indirect = read_memory_unsigned_integer (pc + 2, 4); |
c906108c | 1260 | struct minimal_symbol *indsym = |
fc338970 | 1261 | indirect ? lookup_minimal_symbol_by_pc (indirect) : 0; |
c5aa993b | 1262 | char *symname = indsym ? SYMBOL_NAME (indsym) : 0; |
c906108c | 1263 | |
c5aa993b | 1264 | if (symname) |
c906108c | 1265 | { |
c5aa993b JM |
1266 | if (strncmp (symname, "__imp_", 6) == 0 |
1267 | || strncmp (symname, "_imp_", 5) == 0) | |
c906108c SS |
1268 | return name ? 1 : read_memory_unsigned_integer (indirect, 4); |
1269 | } | |
1270 | } | |
fc338970 | 1271 | return 0; /* Not a trampoline. */ |
c906108c | 1272 | } |
fc338970 MK |
1273 | \f |
1274 | ||
8201327c MK |
1275 | /* Return non-zero if PC and NAME show that we are in a signal |
1276 | trampoline. */ | |
1277 | ||
1278 | static int | |
1279 | i386_pc_in_sigtramp (CORE_ADDR pc, char *name) | |
1280 | { | |
1281 | return (name && strcmp ("_sigtramp", name) == 0); | |
1282 | } | |
1283 | \f | |
1284 | ||
fc338970 MK |
1285 | /* We have two flavours of disassembly. The machinery on this page |
1286 | deals with switching between those. */ | |
c906108c SS |
1287 | |
1288 | static int | |
fba45db2 | 1289 | gdb_print_insn_i386 (bfd_vma memaddr, disassemble_info *info) |
c906108c SS |
1290 | { |
1291 | if (disassembly_flavor == att_flavor) | |
1292 | return print_insn_i386_att (memaddr, info); | |
1293 | else if (disassembly_flavor == intel_flavor) | |
1294 | return print_insn_i386_intel (memaddr, info); | |
fc338970 MK |
1295 | /* Never reached -- disassembly_flavour is always either att_flavor |
1296 | or intel_flavor. */ | |
e1e9e218 | 1297 | internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
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 | |
8201327c | 1373 | /* FIXME: kettenis/20020511: Why do we override this function here? */ |
b4671f85 | 1374 | set_gdbarch_frame_chain_valid (gdbarch, generic_func_frame_chain_valid); |
3ce1502b | 1375 | |
8201327c | 1376 | set_gdbarch_pc_in_sigtramp (gdbarch, i386_svr4_pc_in_sigtramp); |
21d0e8a4 MK |
1377 | tdep->sigcontext_addr = i386_svr4_sigcontext_addr; |
1378 | tdep->sc_pc_offset = 14 * 4; | |
1379 | tdep->sc_sp_offset = 7 * 4; | |
3ce1502b | 1380 | |
8201327c | 1381 | tdep->jb_pc_offset = 20; |
3ce1502b MK |
1382 | } |
1383 | ||
8201327c | 1384 | /* DJGPP. */ |
3ce1502b | 1385 | |
3a1e71e3 | 1386 | static void |
8201327c | 1387 | i386_go32_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
3ce1502b | 1388 | { |
8201327c | 1389 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
3ce1502b | 1390 | |
8201327c | 1391 | set_gdbarch_pc_in_sigtramp (gdbarch, i386_go32_pc_in_sigtramp); |
3ce1502b | 1392 | |
8201327c | 1393 | tdep->jb_pc_offset = 36; |
3ce1502b MK |
1394 | } |
1395 | ||
8201327c | 1396 | /* NetWare. */ |
3ce1502b | 1397 | |
3a1e71e3 | 1398 | static void |
8201327c | 1399 | i386_nw_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
3ce1502b | 1400 | { |
8201327c | 1401 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
3ce1502b | 1402 | |
8201327c | 1403 | /* FIXME: kettenis/20020511: Why do we override this function here? */ |
b4671f85 | 1404 | set_gdbarch_frame_chain_valid (gdbarch, generic_func_frame_chain_valid); |
8201327c MK |
1405 | |
1406 | tdep->jb_pc_offset = 24; | |
d2a7c97a | 1407 | } |
8201327c | 1408 | \f |
2acceee2 | 1409 | |
3a1e71e3 | 1410 | static struct gdbarch * |
a62cc96e AC |
1411 | i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
1412 | { | |
cd3c07fc | 1413 | struct gdbarch_tdep *tdep; |
a62cc96e | 1414 | struct gdbarch *gdbarch; |
8201327c | 1415 | enum gdb_osabi osabi = GDB_OSABI_UNKNOWN; |
a62cc96e | 1416 | |
8201327c | 1417 | /* Try to determine the OS ABI of the object we're loading. */ |
3ce1502b | 1418 | if (info.abfd != NULL) |
8201327c | 1419 | osabi = gdbarch_lookup_osabi (info.abfd); |
d2a7c97a | 1420 | |
3ce1502b | 1421 | /* Find a candidate among extant architectures. */ |
d2a7c97a MK |
1422 | for (arches = gdbarch_list_lookup_by_info (arches, &info); |
1423 | arches != NULL; | |
1424 | arches = gdbarch_list_lookup_by_info (arches->next, &info)) | |
1425 | { | |
8201327c | 1426 | /* Make sure the OS ABI selection matches. */ |
65d6d66a | 1427 | tdep = gdbarch_tdep (arches->gdbarch); |
8201327c | 1428 | if (tdep && tdep->osabi == osabi) |
65d6d66a | 1429 | return arches->gdbarch; |
d2a7c97a | 1430 | } |
a62cc96e AC |
1431 | |
1432 | /* Allocate space for the new architecture. */ | |
1433 | tdep = XMALLOC (struct gdbarch_tdep); | |
1434 | gdbarch = gdbarch_alloc (&info, tdep); | |
1435 | ||
8201327c MK |
1436 | tdep->osabi = osabi; |
1437 | ||
1438 | /* The i386 default settings don't include the SSE registers. | |
356a6b3e MK |
1439 | FIXME: kettenis/20020614: They do include the FPU registers for |
1440 | now, which probably is not quite right. */ | |
8201327c | 1441 | tdep->num_xmm_regs = 0; |
d2a7c97a | 1442 | |
8201327c MK |
1443 | tdep->jb_pc_offset = -1; |
1444 | tdep->struct_return = pcc_struct_return; | |
8201327c MK |
1445 | tdep->sigtramp_start = 0; |
1446 | tdep->sigtramp_end = 0; | |
21d0e8a4 | 1447 | tdep->sigcontext_addr = NULL; |
8201327c | 1448 | tdep->sc_pc_offset = -1; |
21d0e8a4 | 1449 | tdep->sc_sp_offset = -1; |
8201327c | 1450 | |
896fb97d MK |
1451 | /* The format used for `long double' on almost all i386 targets is |
1452 | the i387 extended floating-point format. In fact, of all targets | |
1453 | in the GCC 2.95 tree, only OSF/1 does it different, and insists | |
1454 | on having a `long double' that's not `long' at all. */ | |
1455 | set_gdbarch_long_double_format (gdbarch, &floatformat_i387_ext); | |
21d0e8a4 | 1456 | |
896fb97d MK |
1457 | /* Although the i386 extended floating-point has only 80 significant |
1458 | bits, a `long double' actually takes up 96, probably to enforce | |
1459 | alignment. */ | |
1460 | set_gdbarch_long_double_bit (gdbarch, 96); | |
1461 | ||
356a6b3e MK |
1462 | /* NOTE: tm-i386aix.h, tm-i386bsd.h, tm-i386os9k.h, tm-ptx.h, |
1463 | tm-symmetry.h currently override this. Sigh. */ | |
1464 | set_gdbarch_num_regs (gdbarch, I386_NUM_GREGS + I386_NUM_FREGS); | |
21d0e8a4 | 1465 | |
356a6b3e MK |
1466 | set_gdbarch_sp_regnum (gdbarch, 4); |
1467 | set_gdbarch_fp_regnum (gdbarch, 5); | |
1468 | set_gdbarch_pc_regnum (gdbarch, 8); | |
1469 | set_gdbarch_ps_regnum (gdbarch, 9); | |
1470 | set_gdbarch_fp0_regnum (gdbarch, 16); | |
1471 | ||
1472 | /* Use the "default" register numbering scheme for stabs and COFF. */ | |
1473 | set_gdbarch_stab_reg_to_regnum (gdbarch, i386_stab_reg_to_regnum); | |
1474 | set_gdbarch_sdb_reg_to_regnum (gdbarch, i386_stab_reg_to_regnum); | |
1475 | ||
1476 | /* Use the DWARF register numbering scheme for DWARF and DWARF 2. */ | |
1477 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, i386_dwarf_reg_to_regnum); | |
1478 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, i386_dwarf_reg_to_regnum); | |
1479 | ||
1480 | /* We don't define ECOFF_REG_TO_REGNUM, since ECOFF doesn't seem to | |
1481 | be in use on any of the supported i386 targets. */ | |
1482 | ||
1483 | set_gdbarch_register_name (gdbarch, i386_register_name); | |
1484 | set_gdbarch_register_size (gdbarch, 4); | |
1485 | set_gdbarch_register_bytes (gdbarch, I386_SIZEOF_GREGS + I386_SIZEOF_FREGS); | |
00f8375e MK |
1486 | set_gdbarch_max_register_raw_size (gdbarch, I386_MAX_REGISTER_SIZE); |
1487 | set_gdbarch_max_register_virtual_size (gdbarch, I386_MAX_REGISTER_SIZE); | |
b6197528 | 1488 | set_gdbarch_register_virtual_type (gdbarch, i386_register_virtual_type); |
356a6b3e | 1489 | |
61113f8b MK |
1490 | set_gdbarch_print_float_info (gdbarch, i387_print_float_info); |
1491 | ||
8201327c | 1492 | set_gdbarch_get_longjmp_target (gdbarch, i386_get_longjmp_target); |
96297dab | 1493 | |
c0d1d883 | 1494 | set_gdbarch_use_generic_dummy_frames (gdbarch, 1); |
a62cc96e AC |
1495 | |
1496 | /* Call dummy code. */ | |
c0d1d883 MK |
1497 | set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT); |
1498 | set_gdbarch_call_dummy_address (gdbarch, entry_point_address); | |
8758dec1 | 1499 | set_gdbarch_call_dummy_start_offset (gdbarch, 0); |
c0d1d883 | 1500 | set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0); |
a62cc96e | 1501 | set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1); |
c0d1d883 | 1502 | set_gdbarch_call_dummy_length (gdbarch, 0); |
a62cc96e | 1503 | set_gdbarch_call_dummy_p (gdbarch, 1); |
c0d1d883 MK |
1504 | set_gdbarch_call_dummy_words (gdbarch, NULL); |
1505 | set_gdbarch_sizeof_call_dummy_words (gdbarch, 0); | |
a62cc96e | 1506 | set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); |
c0d1d883 | 1507 | set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy); |
a62cc96e | 1508 | |
b6197528 MK |
1509 | set_gdbarch_register_convertible (gdbarch, i386_register_convertible); |
1510 | set_gdbarch_register_convert_to_virtual (gdbarch, | |
1511 | i386_register_convert_to_virtual); | |
1512 | set_gdbarch_register_convert_to_raw (gdbarch, i386_register_convert_to_raw); | |
1513 | ||
7b4c2dce | 1514 | set_gdbarch_get_saved_register (gdbarch, generic_unwind_get_saved_register); |
a62cc96e AC |
1515 | set_gdbarch_push_arguments (gdbarch, i386_push_arguments); |
1516 | ||
c0d1d883 | 1517 | set_gdbarch_pc_in_call_dummy (gdbarch, pc_in_call_dummy_at_entry_point); |
a62cc96e | 1518 | |
8758dec1 MK |
1519 | /* "An argument's size is increased, if necessary, to make it a |
1520 | multiple of [32-bit] words. This may require tail padding, | |
1521 | depending on the size of the argument" -- from the x86 ABI. */ | |
1522 | set_gdbarch_parm_boundary (gdbarch, 32); | |
1523 | ||
00f8375e | 1524 | set_gdbarch_extract_return_value (gdbarch, i386_extract_return_value); |
fc08ec52 | 1525 | set_gdbarch_push_arguments (gdbarch, i386_push_arguments); |
c0d1d883 MK |
1526 | set_gdbarch_push_dummy_frame (gdbarch, generic_push_dummy_frame); |
1527 | set_gdbarch_push_return_address (gdbarch, i386_push_return_address); | |
fc08ec52 MK |
1528 | set_gdbarch_pop_frame (gdbarch, i386_pop_frame); |
1529 | set_gdbarch_store_struct_return (gdbarch, i386_store_struct_return); | |
1530 | set_gdbarch_store_return_value (gdbarch, i386_store_return_value); | |
00f8375e | 1531 | set_gdbarch_extract_struct_value_address (gdbarch, |
fc08ec52 | 1532 | i386_extract_struct_value_address); |
8201327c MK |
1533 | set_gdbarch_use_struct_convention (gdbarch, i386_use_struct_convention); |
1534 | ||
42fdc8df | 1535 | set_gdbarch_frame_init_saved_regs (gdbarch, i386_frame_init_saved_regs); |
93924b6b MK |
1536 | set_gdbarch_skip_prologue (gdbarch, i386_skip_prologue); |
1537 | ||
1538 | /* Stack grows downward. */ | |
1539 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
1540 | ||
1541 | set_gdbarch_breakpoint_from_pc (gdbarch, i386_breakpoint_from_pc); | |
1542 | set_gdbarch_decr_pc_after_break (gdbarch, 1); | |
1543 | set_gdbarch_function_start_offset (gdbarch, 0); | |
42fdc8df | 1544 | |
8201327c MK |
1545 | /* The following redefines make backtracing through sigtramp work. |
1546 | They manufacture a fake sigtramp frame and obtain the saved pc in | |
1547 | sigtramp from the sigcontext structure which is pushed by the | |
1548 | kernel on the user stack, along with a pointer to it. */ | |
1549 | ||
42fdc8df MK |
1550 | set_gdbarch_frame_args_skip (gdbarch, 8); |
1551 | set_gdbarch_frameless_function_invocation (gdbarch, | |
1552 | i386_frameless_function_invocation); | |
8201327c | 1553 | set_gdbarch_frame_chain (gdbarch, i386_frame_chain); |
c0d1d883 | 1554 | set_gdbarch_frame_chain_valid (gdbarch, generic_file_frame_chain_valid); |
8201327c | 1555 | set_gdbarch_frame_saved_pc (gdbarch, i386_frame_saved_pc); |
42fdc8df MK |
1556 | set_gdbarch_frame_args_address (gdbarch, default_frame_address); |
1557 | set_gdbarch_frame_locals_address (gdbarch, default_frame_address); | |
8201327c | 1558 | set_gdbarch_saved_pc_after_call (gdbarch, i386_saved_pc_after_call); |
42fdc8df | 1559 | set_gdbarch_frame_num_args (gdbarch, i386_frame_num_args); |
8201327c MK |
1560 | set_gdbarch_pc_in_sigtramp (gdbarch, i386_pc_in_sigtramp); |
1561 | ||
28fc6740 AC |
1562 | /* Wire in the MMX registers. */ |
1563 | set_gdbarch_num_pseudo_regs (gdbarch, mmx_num_regs); | |
1564 | set_gdbarch_pseudo_register_read (gdbarch, i386_pseudo_register_read); | |
1565 | set_gdbarch_pseudo_register_write (gdbarch, i386_pseudo_register_write); | |
1566 | ||
3ce1502b | 1567 | /* Hook in ABI-specific overrides, if they have been registered. */ |
8201327c | 1568 | gdbarch_init_osabi (info, gdbarch, osabi); |
3ce1502b | 1569 | |
a62cc96e AC |
1570 | return gdbarch; |
1571 | } | |
1572 | ||
8201327c MK |
1573 | static enum gdb_osabi |
1574 | i386_coff_osabi_sniffer (bfd *abfd) | |
1575 | { | |
762c5349 MK |
1576 | if (strcmp (bfd_get_target (abfd), "coff-go32-exe") == 0 |
1577 | || strcmp (bfd_get_target (abfd), "coff-go32") == 0) | |
8201327c MK |
1578 | return GDB_OSABI_GO32; |
1579 | ||
1580 | return GDB_OSABI_UNKNOWN; | |
1581 | } | |
1582 | ||
1583 | static enum gdb_osabi | |
1584 | i386_nlm_osabi_sniffer (bfd *abfd) | |
1585 | { | |
1586 | return GDB_OSABI_NETWARE; | |
1587 | } | |
1588 | \f | |
1589 | ||
28e9e0f0 MK |
1590 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1591 | void _initialize_i386_tdep (void); | |
1592 | ||
c906108c | 1593 | void |
fba45db2 | 1594 | _initialize_i386_tdep (void) |
c906108c | 1595 | { |
a62cc96e AC |
1596 | register_gdbarch_init (bfd_arch_i386, i386_gdbarch_init); |
1597 | ||
c906108c SS |
1598 | tm_print_insn = gdb_print_insn_i386; |
1599 | tm_print_insn_info.mach = bfd_lookup_arch (bfd_arch_i386, 0)->mach; | |
1600 | ||
fc338970 | 1601 | /* Add the variable that controls the disassembly flavor. */ |
917317f4 JM |
1602 | { |
1603 | struct cmd_list_element *new_cmd; | |
7a292a7a | 1604 | |
917317f4 JM |
1605 | new_cmd = add_set_enum_cmd ("disassembly-flavor", no_class, |
1606 | valid_flavors, | |
1ed2a135 | 1607 | &disassembly_flavor, |
fc338970 MK |
1608 | "\ |
1609 | Set the disassembly flavor, the valid values are \"att\" and \"intel\", \ | |
c906108c | 1610 | and the default value is \"att\".", |
917317f4 | 1611 | &setlist); |
917317f4 JM |
1612 | add_show_from_set (new_cmd, &showlist); |
1613 | } | |
8201327c MK |
1614 | |
1615 | /* Add the variable that controls the convention for returning | |
1616 | structs. */ | |
1617 | { | |
1618 | struct cmd_list_element *new_cmd; | |
1619 | ||
1620 | new_cmd = add_set_enum_cmd ("struct-convention", no_class, | |
1621 | valid_conventions, | |
1622 | &struct_convention, "\ | |
1623 | Set the convention for returning small structs, valid values \ | |
1624 | are \"default\", \"pcc\" and \"reg\", and the default value is \"default\".", | |
1625 | &setlist); | |
1626 | add_show_from_set (new_cmd, &showlist); | |
1627 | } | |
1628 | ||
1629 | gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour, | |
1630 | i386_coff_osabi_sniffer); | |
1631 | gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_nlm_flavour, | |
1632 | i386_nlm_osabi_sniffer); | |
1633 | ||
1634 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_SVR4, | |
1635 | i386_svr4_init_abi); | |
1636 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_GO32, | |
1637 | i386_go32_init_abi); | |
1638 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETWARE, | |
1639 | i386_nw_init_abi); | |
c906108c | 1640 | } |