Commit | Line | Data |
---|---|---|
c906108c | 1 | /* Intel 386 target-dependent stuff. |
b6ba6518 KB |
2 | Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, |
3 | 1998, 1999, 2000, 2001 | |
c906108c SS |
4 | Free Software Foundation, Inc. |
5 | ||
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b JM |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
22 | |
23 | #include "defs.h" | |
24 | #include "gdb_string.h" | |
25 | #include "frame.h" | |
26 | #include "inferior.h" | |
27 | #include "gdbcore.h" | |
28 | #include "target.h" | |
29 | #include "floatformat.h" | |
30 | #include "symtab.h" | |
31 | #include "gdbcmd.h" | |
32 | #include "command.h" | |
b4a20239 | 33 | #include "arch-utils.h" |
4e052eda | 34 | #include "regcache.h" |
c906108c | 35 | |
3d261580 MK |
36 | #include "gdb_assert.h" |
37 | ||
917317f4 JM |
38 | /* i386_register_byte[i] is the offset into the register file of the |
39 | start of register number i. We initialize this from | |
40 | i386_register_raw_size. */ | |
41 | int i386_register_byte[MAX_NUM_REGS]; | |
42 | ||
ceb4951f JB |
43 | /* i386_register_raw_size[i] is the number of bytes of storage in |
44 | GDB's register array occupied by register i. */ | |
917317f4 JM |
45 | int i386_register_raw_size[MAX_NUM_REGS] = { |
46 | 4, 4, 4, 4, | |
47 | 4, 4, 4, 4, | |
48 | 4, 4, 4, 4, | |
49 | 4, 4, 4, 4, | |
50 | 10, 10, 10, 10, | |
51 | 10, 10, 10, 10, | |
52 | 4, 4, 4, 4, | |
53 | 4, 4, 4, 4, | |
54 | 16, 16, 16, 16, | |
55 | 16, 16, 16, 16, | |
56 | 4 | |
57 | }; | |
58 | ||
59 | /* i386_register_virtual_size[i] is the size in bytes of the virtual | |
60 | type of register i. */ | |
61 | int i386_register_virtual_size[MAX_NUM_REGS]; | |
85540d8c MK |
62 | |
63 | /* Convert stabs register number REG to the appropriate register | |
64 | number used by GDB. */ | |
65 | ||
66 | int | |
67 | i386_stab_reg_to_regnum (int reg) | |
68 | { | |
69 | /* This implements what GCC calls the "default" register map. */ | |
70 | if (reg >= 0 && reg <= 7) | |
71 | { | |
72 | /* General registers. */ | |
73 | return reg; | |
74 | } | |
75 | else if (reg >= 12 && reg <= 19) | |
76 | { | |
77 | /* Floating-point registers. */ | |
78 | return reg - 12 + FP0_REGNUM; | |
79 | } | |
80 | else if (reg >= 21 && reg <= 28) | |
81 | { | |
82 | /* SSE registers. */ | |
83 | return reg - 21 + XMM0_REGNUM; | |
84 | } | |
85 | else if (reg >= 29 && reg <= 36) | |
86 | { | |
87 | /* MMX registers. */ | |
88 | /* FIXME: kettenis/2001-07-28: Should we have the MMX registers | |
89 | as pseudo-registers? */ | |
90 | return reg - 29 + FP0_REGNUM; | |
91 | } | |
92 | ||
93 | /* This will hopefully provoke a warning. */ | |
94 | return NUM_REGS + NUM_PSEUDO_REGS; | |
95 | } | |
96 | ||
97 | /* Convert Dwarf register number REG to the appropriate register | |
98 | number used by GDB. */ | |
99 | ||
100 | int | |
101 | i386_dwarf_reg_to_regnum (int reg) | |
102 | { | |
103 | /* The DWARF register numbering includes %eip and %eflags, and | |
104 | numbers the floating point registers differently. */ | |
105 | if (reg >= 0 && reg <= 9) | |
106 | { | |
107 | /* General registers. */ | |
108 | return reg; | |
109 | } | |
110 | else if (reg >= 11 && reg <= 18) | |
111 | { | |
112 | /* Floating-point registers. */ | |
113 | return reg - 11 + FP0_REGNUM; | |
114 | } | |
115 | else if (reg >= 21) | |
116 | { | |
117 | /* The SSE and MMX registers have identical numbers as in stabs. */ | |
118 | return i386_stab_reg_to_regnum (reg); | |
119 | } | |
120 | ||
121 | /* This will hopefully provoke a warning. */ | |
122 | return NUM_REGS + NUM_PSEUDO_REGS; | |
123 | } | |
fc338970 | 124 | \f |
917317f4 | 125 | |
fc338970 MK |
126 | /* This is the variable that is set with "set disassembly-flavor", and |
127 | its legitimate values. */ | |
53904c9e AC |
128 | static const char att_flavor[] = "att"; |
129 | static const char intel_flavor[] = "intel"; | |
130 | static const char *valid_flavors[] = | |
c5aa993b | 131 | { |
c906108c SS |
132 | att_flavor, |
133 | intel_flavor, | |
134 | NULL | |
135 | }; | |
53904c9e | 136 | static const char *disassembly_flavor = att_flavor; |
c906108c | 137 | |
fc338970 MK |
138 | /* This is used to keep the bfd arch_info in sync with the disassembly |
139 | flavor. */ | |
a14ed312 KB |
140 | static void set_disassembly_flavor_sfunc (char *, int, |
141 | struct cmd_list_element *); | |
142 | static void set_disassembly_flavor (void); | |
fc338970 MK |
143 | \f |
144 | ||
145 | /* Stdio style buffering was used to minimize calls to ptrace, but | |
146 | this buffering did not take into account that the code section | |
147 | being accessed may not be an even number of buffers long (even if | |
148 | the buffer is only sizeof(int) long). In cases where the code | |
149 | section size happened to be a non-integral number of buffers long, | |
150 | attempting to read the last buffer would fail. Simply using | |
151 | target_read_memory and ignoring errors, rather than read_memory, is | |
152 | not the correct solution, since legitimate access errors would then | |
153 | be totally ignored. To properly handle this situation and continue | |
154 | to use buffering would require that this code be able to determine | |
155 | the minimum code section size granularity (not the alignment of the | |
156 | section itself, since the actual failing case that pointed out this | |
157 | problem had a section alignment of 4 but was not a multiple of 4 | |
158 | bytes long), on a target by target basis, and then adjust it's | |
159 | buffer size accordingly. This is messy, but potentially feasible. | |
160 | It probably needs the bfd library's help and support. For now, the | |
161 | buffer size is set to 1. (FIXME -fnf) */ | |
162 | ||
163 | #define CODESTREAM_BUFSIZ 1 /* Was sizeof(int), see note above. */ | |
c906108c SS |
164 | static CORE_ADDR codestream_next_addr; |
165 | static CORE_ADDR codestream_addr; | |
166 | static unsigned char codestream_buf[CODESTREAM_BUFSIZ]; | |
167 | static int codestream_off; | |
168 | static int codestream_cnt; | |
169 | ||
170 | #define codestream_tell() (codestream_addr + codestream_off) | |
fc338970 MK |
171 | #define codestream_peek() \ |
172 | (codestream_cnt == 0 ? \ | |
173 | codestream_fill(1) : codestream_buf[codestream_off]) | |
174 | #define codestream_get() \ | |
175 | (codestream_cnt-- == 0 ? \ | |
176 | codestream_fill(0) : codestream_buf[codestream_off++]) | |
c906108c | 177 | |
c5aa993b | 178 | static unsigned char |
fba45db2 | 179 | codestream_fill (int peek_flag) |
c906108c SS |
180 | { |
181 | codestream_addr = codestream_next_addr; | |
182 | codestream_next_addr += CODESTREAM_BUFSIZ; | |
183 | codestream_off = 0; | |
184 | codestream_cnt = CODESTREAM_BUFSIZ; | |
185 | read_memory (codestream_addr, (char *) codestream_buf, CODESTREAM_BUFSIZ); | |
c5aa993b | 186 | |
c906108c | 187 | if (peek_flag) |
c5aa993b | 188 | return (codestream_peek ()); |
c906108c | 189 | else |
c5aa993b | 190 | return (codestream_get ()); |
c906108c SS |
191 | } |
192 | ||
193 | static void | |
fba45db2 | 194 | codestream_seek (CORE_ADDR place) |
c906108c SS |
195 | { |
196 | codestream_next_addr = place / CODESTREAM_BUFSIZ; | |
197 | codestream_next_addr *= CODESTREAM_BUFSIZ; | |
198 | codestream_cnt = 0; | |
199 | codestream_fill (1); | |
c5aa993b | 200 | while (codestream_tell () != place) |
c906108c SS |
201 | codestream_get (); |
202 | } | |
203 | ||
204 | static void | |
fba45db2 | 205 | codestream_read (unsigned char *buf, int count) |
c906108c SS |
206 | { |
207 | unsigned char *p; | |
208 | int i; | |
209 | p = buf; | |
210 | for (i = 0; i < count; i++) | |
211 | *p++ = codestream_get (); | |
212 | } | |
fc338970 | 213 | \f |
c906108c | 214 | |
fc338970 | 215 | /* If the next instruction is a jump, move to its target. */ |
c906108c SS |
216 | |
217 | static void | |
fba45db2 | 218 | i386_follow_jump (void) |
c906108c SS |
219 | { |
220 | unsigned char buf[4]; | |
221 | long delta; | |
222 | ||
223 | int data16; | |
224 | CORE_ADDR pos; | |
225 | ||
226 | pos = codestream_tell (); | |
227 | ||
228 | data16 = 0; | |
229 | if (codestream_peek () == 0x66) | |
230 | { | |
231 | codestream_get (); | |
232 | data16 = 1; | |
233 | } | |
234 | ||
235 | switch (codestream_get ()) | |
236 | { | |
237 | case 0xe9: | |
fc338970 | 238 | /* Relative jump: if data16 == 0, disp32, else disp16. */ |
c906108c SS |
239 | if (data16) |
240 | { | |
241 | codestream_read (buf, 2); | |
242 | delta = extract_signed_integer (buf, 2); | |
243 | ||
fc338970 MK |
244 | /* Include the size of the jmp instruction (including the |
245 | 0x66 prefix). */ | |
c5aa993b | 246 | pos += delta + 4; |
c906108c SS |
247 | } |
248 | else | |
249 | { | |
250 | codestream_read (buf, 4); | |
251 | delta = extract_signed_integer (buf, 4); | |
252 | ||
253 | pos += delta + 5; | |
254 | } | |
255 | break; | |
256 | case 0xeb: | |
fc338970 | 257 | /* Relative jump, disp8 (ignore data16). */ |
c906108c SS |
258 | codestream_read (buf, 1); |
259 | /* Sign-extend it. */ | |
260 | delta = extract_signed_integer (buf, 1); | |
261 | ||
262 | pos += delta + 2; | |
263 | break; | |
264 | } | |
265 | codestream_seek (pos); | |
266 | } | |
267 | ||
fc338970 MK |
268 | /* Find & return the amount a local space allocated, and advance the |
269 | codestream to the first register push (if any). | |
270 | ||
271 | If the entry sequence doesn't make sense, return -1, and leave | |
272 | codestream pointer at a random spot. */ | |
c906108c SS |
273 | |
274 | static long | |
fba45db2 | 275 | i386_get_frame_setup (CORE_ADDR pc) |
c906108c SS |
276 | { |
277 | unsigned char op; | |
278 | ||
279 | codestream_seek (pc); | |
280 | ||
281 | i386_follow_jump (); | |
282 | ||
283 | op = codestream_get (); | |
284 | ||
285 | if (op == 0x58) /* popl %eax */ | |
286 | { | |
fc338970 MK |
287 | /* This function must start with |
288 | ||
289 | popl %eax 0x58 | |
290 | xchgl %eax, (%esp) 0x87 0x04 0x24 | |
291 | or xchgl %eax, 0(%esp) 0x87 0x44 0x24 0x00 | |
292 | ||
293 | (the System V compiler puts out the second `xchg' | |
294 | instruction, and the assembler doesn't try to optimize it, so | |
295 | the 'sib' form gets generated). This sequence is used to get | |
296 | the address of the return buffer for a function that returns | |
297 | a structure. */ | |
c906108c SS |
298 | int pos; |
299 | unsigned char buf[4]; | |
fc338970 MK |
300 | static unsigned char proto1[3] = { 0x87, 0x04, 0x24 }; |
301 | static unsigned char proto2[4] = { 0x87, 0x44, 0x24, 0x00 }; | |
302 | ||
c906108c SS |
303 | pos = codestream_tell (); |
304 | codestream_read (buf, 4); | |
305 | if (memcmp (buf, proto1, 3) == 0) | |
306 | pos += 3; | |
307 | else if (memcmp (buf, proto2, 4) == 0) | |
308 | pos += 4; | |
309 | ||
310 | codestream_seek (pos); | |
fc338970 | 311 | op = codestream_get (); /* Update next opcode. */ |
c906108c SS |
312 | } |
313 | ||
314 | if (op == 0x68 || op == 0x6a) | |
315 | { | |
fc338970 MK |
316 | /* This function may start with |
317 | ||
318 | pushl constant | |
319 | call _probe | |
320 | addl $4, %esp | |
321 | ||
322 | followed by | |
323 | ||
324 | pushl %ebp | |
325 | ||
326 | etc. */ | |
c906108c SS |
327 | int pos; |
328 | unsigned char buf[8]; | |
329 | ||
fc338970 | 330 | /* Skip past the `pushl' instruction; it has either a one-byte |
c906108c SS |
331 | or a four-byte operand, depending on the opcode. */ |
332 | pos = codestream_tell (); | |
333 | if (op == 0x68) | |
334 | pos += 4; | |
335 | else | |
336 | pos += 1; | |
337 | codestream_seek (pos); | |
338 | ||
fc338970 MK |
339 | /* Read the following 8 bytes, which should be "call _probe" (6 |
340 | bytes) followed by "addl $4,%esp" (2 bytes). */ | |
c906108c SS |
341 | codestream_read (buf, sizeof (buf)); |
342 | if (buf[0] == 0xe8 && buf[6] == 0xc4 && buf[7] == 0x4) | |
343 | pos += sizeof (buf); | |
344 | codestream_seek (pos); | |
fc338970 | 345 | op = codestream_get (); /* Update next opcode. */ |
c906108c SS |
346 | } |
347 | ||
348 | if (op == 0x55) /* pushl %ebp */ | |
c5aa993b | 349 | { |
fc338970 | 350 | /* Check for "movl %esp, %ebp" -- can be written in two ways. */ |
c906108c SS |
351 | switch (codestream_get ()) |
352 | { | |
353 | case 0x8b: | |
354 | if (codestream_get () != 0xec) | |
fc338970 | 355 | return -1; |
c906108c SS |
356 | break; |
357 | case 0x89: | |
358 | if (codestream_get () != 0xe5) | |
fc338970 | 359 | return -1; |
c906108c SS |
360 | break; |
361 | default: | |
fc338970 | 362 | return -1; |
c906108c | 363 | } |
fc338970 MK |
364 | /* Check for stack adjustment |
365 | ||
366 | subl $XXX, %esp | |
367 | ||
368 | NOTE: You can't subtract a 16 bit immediate from a 32 bit | |
369 | reg, so we don't have to worry about a data16 prefix. */ | |
c906108c SS |
370 | op = codestream_peek (); |
371 | if (op == 0x83) | |
372 | { | |
fc338970 | 373 | /* `subl' with 8 bit immediate. */ |
c906108c SS |
374 | codestream_get (); |
375 | if (codestream_get () != 0xec) | |
fc338970 | 376 | /* Some instruction starting with 0x83 other than `subl'. */ |
c906108c SS |
377 | { |
378 | codestream_seek (codestream_tell () - 2); | |
379 | return 0; | |
380 | } | |
fc338970 MK |
381 | /* `subl' with signed byte immediate (though it wouldn't |
382 | make sense to be negative). */ | |
c5aa993b | 383 | return (codestream_get ()); |
c906108c SS |
384 | } |
385 | else if (op == 0x81) | |
386 | { | |
387 | char buf[4]; | |
fc338970 | 388 | /* Maybe it is `subl' with a 32 bit immedediate. */ |
c5aa993b | 389 | codestream_get (); |
c906108c | 390 | if (codestream_get () != 0xec) |
fc338970 | 391 | /* Some instruction starting with 0x81 other than `subl'. */ |
c906108c SS |
392 | { |
393 | codestream_seek (codestream_tell () - 2); | |
394 | return 0; | |
395 | } | |
fc338970 | 396 | /* It is `subl' with a 32 bit immediate. */ |
c5aa993b | 397 | codestream_read ((unsigned char *) buf, 4); |
c906108c SS |
398 | return extract_signed_integer (buf, 4); |
399 | } | |
400 | else | |
401 | { | |
fc338970 | 402 | return 0; |
c906108c SS |
403 | } |
404 | } | |
405 | else if (op == 0xc8) | |
406 | { | |
407 | char buf[2]; | |
fc338970 | 408 | /* `enter' with 16 bit unsigned immediate. */ |
c5aa993b | 409 | codestream_read ((unsigned char *) buf, 2); |
fc338970 | 410 | codestream_get (); /* Flush final byte of enter instruction. */ |
c906108c SS |
411 | return extract_unsigned_integer (buf, 2); |
412 | } | |
413 | return (-1); | |
414 | } | |
415 | ||
c833a37e MK |
416 | /* Return the chain-pointer for FRAME. In the case of the i386, the |
417 | frame's nominal address is the address of a 4-byte word containing | |
418 | the calling frame's address. */ | |
419 | ||
420 | CORE_ADDR | |
421 | i386_frame_chain (struct frame_info *frame) | |
422 | { | |
423 | if (frame->signal_handler_caller) | |
424 | return frame->frame; | |
425 | ||
426 | if (! inside_entry_file (frame->pc)) | |
427 | return read_memory_unsigned_integer (frame->frame, 4); | |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
539ffe0b MK |
432 | /* Determine whether the function invocation represented by FRAME does |
433 | not have a from on the stack associated with it. If it does not, | |
434 | return non-zero, otherwise return zero. */ | |
435 | ||
436 | int | |
437 | i386_frameless_function_invocation (struct frame_info *frame) | |
438 | { | |
439 | if (frame->signal_handler_caller) | |
440 | return 0; | |
441 | ||
442 | return frameless_look_for_prologue (frame); | |
443 | } | |
444 | ||
0d17c81d MK |
445 | /* Return the saved program counter for FRAME. */ |
446 | ||
447 | CORE_ADDR | |
448 | i386_frame_saved_pc (struct frame_info *frame) | |
449 | { | |
450 | /* FIXME: kettenis/2001-05-09: Conditionalizing the next bit of code | |
451 | on SIGCONTEXT_PC_OFFSET and I386V4_SIGTRAMP_SAVED_PC should be | |
452 | considered a temporary hack. I plan to come up with something | |
453 | better when we go multi-arch. */ | |
454 | #if defined (SIGCONTEXT_PC_OFFSET) || defined (I386V4_SIGTRAMP_SAVED_PC) | |
455 | if (frame->signal_handler_caller) | |
456 | return sigtramp_saved_pc (frame); | |
457 | #endif | |
458 | ||
459 | return read_memory_unsigned_integer (frame->frame + 4, 4); | |
460 | } | |
461 | ||
ed84f6c1 MK |
462 | /* Immediately after a function call, return the saved pc. */ |
463 | ||
464 | CORE_ADDR | |
465 | i386_saved_pc_after_call (struct frame_info *frame) | |
466 | { | |
467 | return read_memory_unsigned_integer (read_register (SP_REGNUM), 4); | |
468 | } | |
469 | ||
c906108c SS |
470 | /* Return number of args passed to a frame. |
471 | Can return -1, meaning no way to tell. */ | |
472 | ||
473 | int | |
fba45db2 | 474 | i386_frame_num_args (struct frame_info *fi) |
c906108c SS |
475 | { |
476 | #if 1 | |
477 | return -1; | |
478 | #else | |
479 | /* This loses because not only might the compiler not be popping the | |
fc338970 MK |
480 | args right after the function call, it might be popping args from |
481 | both this call and a previous one, and we would say there are | |
482 | more args than there really are. */ | |
c906108c | 483 | |
c5aa993b JM |
484 | int retpc; |
485 | unsigned char op; | |
c906108c SS |
486 | struct frame_info *pfi; |
487 | ||
fc338970 | 488 | /* On the i386, the instruction following the call could be: |
c906108c SS |
489 | popl %ecx - one arg |
490 | addl $imm, %esp - imm/4 args; imm may be 8 or 32 bits | |
fc338970 | 491 | anything else - zero args. */ |
c906108c SS |
492 | |
493 | int frameless; | |
494 | ||
392a587b | 495 | frameless = FRAMELESS_FUNCTION_INVOCATION (fi); |
c906108c | 496 | if (frameless) |
fc338970 MK |
497 | /* In the absence of a frame pointer, GDB doesn't get correct |
498 | values for nameless arguments. Return -1, so it doesn't print | |
499 | any nameless arguments. */ | |
c906108c SS |
500 | return -1; |
501 | ||
c5aa993b | 502 | pfi = get_prev_frame (fi); |
c906108c SS |
503 | if (pfi == 0) |
504 | { | |
fc338970 MK |
505 | /* NOTE: This can happen if we are looking at the frame for |
506 | main, because FRAME_CHAIN_VALID won't let us go into start. | |
507 | If we have debugging symbols, that's not really a big deal; | |
508 | it just means it will only show as many arguments to main as | |
509 | are declared. */ | |
c906108c SS |
510 | return -1; |
511 | } | |
512 | else | |
513 | { | |
c5aa993b JM |
514 | retpc = pfi->pc; |
515 | op = read_memory_integer (retpc, 1); | |
fc338970 | 516 | if (op == 0x59) /* pop %ecx */ |
c5aa993b | 517 | return 1; |
c906108c SS |
518 | else if (op == 0x83) |
519 | { | |
c5aa993b JM |
520 | op = read_memory_integer (retpc + 1, 1); |
521 | if (op == 0xc4) | |
522 | /* addl $<signed imm 8 bits>, %esp */ | |
523 | return (read_memory_integer (retpc + 2, 1) & 0xff) / 4; | |
c906108c SS |
524 | else |
525 | return 0; | |
526 | } | |
fc338970 MK |
527 | else if (op == 0x81) /* `add' with 32 bit immediate. */ |
528 | { | |
c5aa993b JM |
529 | op = read_memory_integer (retpc + 1, 1); |
530 | if (op == 0xc4) | |
531 | /* addl $<imm 32>, %esp */ | |
532 | return read_memory_integer (retpc + 2, 4) / 4; | |
c906108c SS |
533 | else |
534 | return 0; | |
535 | } | |
536 | else | |
537 | { | |
538 | return 0; | |
539 | } | |
540 | } | |
541 | #endif | |
542 | } | |
543 | ||
fc338970 MK |
544 | /* Parse the first few instructions the function to see what registers |
545 | were stored. | |
546 | ||
547 | We handle these cases: | |
548 | ||
549 | The startup sequence can be at the start of the function, or the | |
550 | function can start with a branch to startup code at the end. | |
551 | ||
552 | %ebp can be set up with either the 'enter' instruction, or "pushl | |
553 | %ebp, movl %esp, %ebp" (`enter' is too slow to be useful, but was | |
554 | once used in the System V compiler). | |
555 | ||
556 | Local space is allocated just below the saved %ebp by either the | |
557 | 'enter' instruction, or by "subl $<size>, %esp". 'enter' has a 16 | |
558 | bit unsigned argument for space to allocate, and the 'addl' | |
559 | instruction could have either a signed byte, or 32 bit immediate. | |
560 | ||
561 | Next, the registers used by this function are pushed. With the | |
562 | System V compiler they will always be in the order: %edi, %esi, | |
563 | %ebx (and sometimes a harmless bug causes it to also save but not | |
564 | restore %eax); however, the code below is willing to see the pushes | |
565 | in any order, and will handle up to 8 of them. | |
566 | ||
567 | If the setup sequence is at the end of the function, then the next | |
568 | instruction will be a branch back to the start. */ | |
c906108c SS |
569 | |
570 | void | |
fba45db2 | 571 | i386_frame_init_saved_regs (struct frame_info *fip) |
c906108c SS |
572 | { |
573 | long locals = -1; | |
574 | unsigned char op; | |
575 | CORE_ADDR dummy_bottom; | |
fc338970 | 576 | CORE_ADDR addr; |
c906108c SS |
577 | CORE_ADDR pc; |
578 | int i; | |
c5aa993b | 579 | |
1211c4e4 AC |
580 | if (fip->saved_regs) |
581 | return; | |
582 | ||
583 | frame_saved_regs_zalloc (fip); | |
c5aa993b | 584 | |
fc338970 MK |
585 | /* If the frame is the end of a dummy, compute where the beginning |
586 | would be. */ | |
c906108c | 587 | dummy_bottom = fip->frame - 4 - REGISTER_BYTES - CALL_DUMMY_LENGTH; |
c5aa993b | 588 | |
fc338970 | 589 | /* Check if the PC points in the stack, in a dummy frame. */ |
c5aa993b | 590 | if (dummy_bottom <= fip->pc && fip->pc <= fip->frame) |
c906108c | 591 | { |
fc338970 MK |
592 | /* All registers were saved by push_call_dummy. */ |
593 | addr = fip->frame; | |
c5aa993b | 594 | for (i = 0; i < NUM_REGS; i++) |
c906108c | 595 | { |
fc338970 MK |
596 | addr -= REGISTER_RAW_SIZE (i); |
597 | fip->saved_regs[i] = addr; | |
c906108c SS |
598 | } |
599 | return; | |
600 | } | |
c5aa993b | 601 | |
c906108c SS |
602 | pc = get_pc_function_start (fip->pc); |
603 | if (pc != 0) | |
604 | locals = i386_get_frame_setup (pc); | |
c5aa993b JM |
605 | |
606 | if (locals >= 0) | |
c906108c | 607 | { |
fc338970 | 608 | addr = fip->frame - 4 - locals; |
c5aa993b | 609 | for (i = 0; i < 8; i++) |
c906108c SS |
610 | { |
611 | op = codestream_get (); | |
612 | if (op < 0x50 || op > 0x57) | |
613 | break; | |
614 | #ifdef I386_REGNO_TO_SYMMETRY | |
615 | /* Dynix uses different internal numbering. Ick. */ | |
fc338970 | 616 | fip->saved_regs[I386_REGNO_TO_SYMMETRY (op - 0x50)] = addr; |
c906108c | 617 | #else |
fc338970 | 618 | fip->saved_regs[op - 0x50] = addr; |
c906108c | 619 | #endif |
fc338970 | 620 | addr -= 4; |
c906108c SS |
621 | } |
622 | } | |
c5aa993b | 623 | |
1211c4e4 AC |
624 | fip->saved_regs[PC_REGNUM] = fip->frame + 4; |
625 | fip->saved_regs[FP_REGNUM] = fip->frame; | |
c906108c SS |
626 | } |
627 | ||
fc338970 | 628 | /* Return PC of first real instruction. */ |
c906108c SS |
629 | |
630 | int | |
fba45db2 | 631 | i386_skip_prologue (int pc) |
c906108c SS |
632 | { |
633 | unsigned char op; | |
634 | int i; | |
c5aa993b | 635 | static unsigned char pic_pat[6] = |
fc338970 MK |
636 | { 0xe8, 0, 0, 0, 0, /* call 0x0 */ |
637 | 0x5b, /* popl %ebx */ | |
c5aa993b | 638 | }; |
c906108c | 639 | CORE_ADDR pos; |
c5aa993b | 640 | |
c906108c SS |
641 | if (i386_get_frame_setup (pc) < 0) |
642 | return (pc); | |
c5aa993b | 643 | |
fc338970 MK |
644 | /* Found valid frame setup -- codestream now points to start of push |
645 | instructions for saving registers. */ | |
c5aa993b | 646 | |
fc338970 | 647 | /* Skip over register saves. */ |
c906108c SS |
648 | for (i = 0; i < 8; i++) |
649 | { | |
650 | op = codestream_peek (); | |
fc338970 | 651 | /* Break if not `pushl' instrunction. */ |
c5aa993b | 652 | if (op < 0x50 || op > 0x57) |
c906108c SS |
653 | break; |
654 | codestream_get (); | |
655 | } | |
656 | ||
fc338970 MK |
657 | /* The native cc on SVR4 in -K PIC mode inserts the following code |
658 | to get the address of the global offset table (GOT) into register | |
659 | %ebx | |
660 | ||
661 | call 0x0 | |
662 | popl %ebx | |
663 | movl %ebx,x(%ebp) (optional) | |
664 | addl y,%ebx | |
665 | ||
c906108c SS |
666 | This code is with the rest of the prologue (at the end of the |
667 | function), so we have to skip it to get to the first real | |
668 | instruction at the start of the function. */ | |
c5aa993b | 669 | |
c906108c SS |
670 | pos = codestream_tell (); |
671 | for (i = 0; i < 6; i++) | |
672 | { | |
673 | op = codestream_get (); | |
c5aa993b | 674 | if (pic_pat[i] != op) |
c906108c SS |
675 | break; |
676 | } | |
677 | if (i == 6) | |
678 | { | |
679 | unsigned char buf[4]; | |
680 | long delta = 6; | |
681 | ||
682 | op = codestream_get (); | |
c5aa993b | 683 | if (op == 0x89) /* movl %ebx, x(%ebp) */ |
c906108c SS |
684 | { |
685 | op = codestream_get (); | |
fc338970 | 686 | if (op == 0x5d) /* One byte offset from %ebp. */ |
c906108c SS |
687 | { |
688 | delta += 3; | |
689 | codestream_read (buf, 1); | |
690 | } | |
fc338970 | 691 | else if (op == 0x9d) /* Four byte offset from %ebp. */ |
c906108c SS |
692 | { |
693 | delta += 6; | |
694 | codestream_read (buf, 4); | |
695 | } | |
fc338970 | 696 | else /* Unexpected instruction. */ |
c5aa993b JM |
697 | delta = -1; |
698 | op = codestream_get (); | |
c906108c | 699 | } |
c5aa993b JM |
700 | /* addl y,%ebx */ |
701 | if (delta > 0 && op == 0x81 && codestream_get () == 0xc3) | |
c906108c | 702 | { |
c5aa993b | 703 | pos += delta + 6; |
c906108c SS |
704 | } |
705 | } | |
706 | codestream_seek (pos); | |
c5aa993b | 707 | |
c906108c | 708 | i386_follow_jump (); |
c5aa993b | 709 | |
c906108c SS |
710 | return (codestream_tell ()); |
711 | } | |
712 | ||
713 | void | |
fba45db2 | 714 | i386_push_dummy_frame (void) |
c906108c SS |
715 | { |
716 | CORE_ADDR sp = read_register (SP_REGNUM); | |
717 | int regnum; | |
718 | char regbuf[MAX_REGISTER_RAW_SIZE]; | |
c5aa993b | 719 | |
c906108c SS |
720 | sp = push_word (sp, read_register (PC_REGNUM)); |
721 | sp = push_word (sp, read_register (FP_REGNUM)); | |
722 | write_register (FP_REGNUM, sp); | |
723 | for (regnum = 0; regnum < NUM_REGS; regnum++) | |
724 | { | |
725 | read_register_gen (regnum, regbuf); | |
726 | sp = push_bytes (sp, regbuf, REGISTER_RAW_SIZE (regnum)); | |
727 | } | |
728 | write_register (SP_REGNUM, sp); | |
729 | } | |
730 | ||
a7769679 MK |
731 | /* Insert the (relative) function address into the call sequence |
732 | stored at DYMMY. */ | |
733 | ||
734 | void | |
735 | i386_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs, | |
ea7c478f | 736 | struct value **args, struct type *type, int gcc_p) |
a7769679 MK |
737 | { |
738 | int from, to, delta, loc; | |
739 | ||
740 | loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); | |
741 | from = loc + 5; | |
742 | to = (int)(fun); | |
743 | delta = to - from; | |
744 | ||
745 | *((char *)(dummy) + 1) = (delta & 0xff); | |
746 | *((char *)(dummy) + 2) = ((delta >> 8) & 0xff); | |
747 | *((char *)(dummy) + 3) = ((delta >> 16) & 0xff); | |
748 | *((char *)(dummy) + 4) = ((delta >> 24) & 0xff); | |
749 | } | |
750 | ||
c906108c | 751 | void |
fba45db2 | 752 | i386_pop_frame (void) |
c906108c SS |
753 | { |
754 | struct frame_info *frame = get_current_frame (); | |
755 | CORE_ADDR fp; | |
756 | int regnum; | |
c906108c | 757 | char regbuf[MAX_REGISTER_RAW_SIZE]; |
c5aa993b | 758 | |
c906108c | 759 | fp = FRAME_FP (frame); |
1211c4e4 AC |
760 | i386_frame_init_saved_regs (frame); |
761 | ||
c5aa993b | 762 | for (regnum = 0; regnum < NUM_REGS; regnum++) |
c906108c | 763 | { |
fc338970 MK |
764 | CORE_ADDR addr; |
765 | addr = frame->saved_regs[regnum]; | |
766 | if (addr) | |
c906108c | 767 | { |
fc338970 | 768 | read_memory (addr, regbuf, REGISTER_RAW_SIZE (regnum)); |
c906108c SS |
769 | write_register_bytes (REGISTER_BYTE (regnum), regbuf, |
770 | REGISTER_RAW_SIZE (regnum)); | |
771 | } | |
772 | } | |
773 | write_register (FP_REGNUM, read_memory_integer (fp, 4)); | |
774 | write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); | |
775 | write_register (SP_REGNUM, fp + 8); | |
776 | flush_cached_frames (); | |
777 | } | |
fc338970 | 778 | \f |
c906108c SS |
779 | |
780 | #ifdef GET_LONGJMP_TARGET | |
781 | ||
fc338970 MK |
782 | /* Figure out where the longjmp will land. Slurp the args out of the |
783 | stack. We expect the first arg to be a pointer to the jmp_buf | |
784 | structure from which we extract the pc (JB_PC) that we will land | |
785 | at. The pc is copied into PC. This routine returns true on | |
786 | success. */ | |
c906108c SS |
787 | |
788 | int | |
fba45db2 | 789 | get_longjmp_target (CORE_ADDR *pc) |
c906108c SS |
790 | { |
791 | char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT]; | |
792 | CORE_ADDR sp, jb_addr; | |
793 | ||
794 | sp = read_register (SP_REGNUM); | |
795 | ||
fc338970 | 796 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack. */ |
c906108c SS |
797 | buf, |
798 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
799 | return 0; | |
800 | ||
801 | jb_addr = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
802 | ||
803 | if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, | |
804 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
805 | return 0; | |
806 | ||
807 | *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
808 | ||
809 | return 1; | |
810 | } | |
811 | ||
812 | #endif /* GET_LONGJMP_TARGET */ | |
fc338970 | 813 | \f |
c906108c | 814 | |
22f8ba57 | 815 | CORE_ADDR |
ea7c478f | 816 | i386_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
22f8ba57 MK |
817 | int struct_return, CORE_ADDR struct_addr) |
818 | { | |
819 | sp = default_push_arguments (nargs, args, sp, struct_return, struct_addr); | |
820 | ||
821 | if (struct_return) | |
822 | { | |
823 | char buf[4]; | |
824 | ||
825 | sp -= 4; | |
826 | store_address (buf, 4, struct_addr); | |
827 | write_memory (sp, buf, 4); | |
828 | } | |
829 | ||
830 | return sp; | |
831 | } | |
832 | ||
833 | void | |
834 | i386_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) | |
835 | { | |
836 | /* Do nothing. Everything was already done by i386_push_arguments. */ | |
837 | } | |
838 | ||
1a309862 MK |
839 | /* These registers are used for returning integers (and on some |
840 | targets also for returning `struct' and `union' values when their | |
ef9dff19 | 841 | size and alignment match an integer type). */ |
1a309862 MK |
842 | #define LOW_RETURN_REGNUM 0 /* %eax */ |
843 | #define HIGH_RETURN_REGNUM 2 /* %edx */ | |
844 | ||
845 | /* Extract from an array REGBUF containing the (raw) register state, a | |
846 | function return value of TYPE, and copy that, in virtual format, | |
847 | into VALBUF. */ | |
848 | ||
c906108c | 849 | void |
1a309862 | 850 | i386_extract_return_value (struct type *type, char *regbuf, char *valbuf) |
c906108c | 851 | { |
1a309862 MK |
852 | int len = TYPE_LENGTH (type); |
853 | ||
1e8d0a7b MK |
854 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
855 | && TYPE_NFIELDS (type) == 1) | |
3df1b9b4 MK |
856 | { |
857 | i386_extract_return_value (TYPE_FIELD_TYPE (type, 0), regbuf, valbuf); | |
858 | return; | |
859 | } | |
1e8d0a7b MK |
860 | |
861 | if (TYPE_CODE (type) == TYPE_CODE_FLT) | |
c906108c | 862 | { |
1a309862 MK |
863 | if (NUM_FREGS == 0) |
864 | { | |
865 | warning ("Cannot find floating-point return value."); | |
866 | memset (valbuf, 0, len); | |
ef9dff19 | 867 | return; |
1a309862 MK |
868 | } |
869 | ||
635b0cc1 | 870 | /* Floating-point return values can be found in %st(0). */ |
1a309862 MK |
871 | if (len == TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT |
872 | && TARGET_LONG_DOUBLE_FORMAT == &floatformat_i387_ext) | |
873 | { | |
874 | /* Copy straight over, but take care of the padding. */ | |
875 | memcpy (valbuf, ®buf[REGISTER_BYTE (FP0_REGNUM)], | |
876 | FPU_REG_RAW_SIZE); | |
877 | memset (valbuf + FPU_REG_RAW_SIZE, 0, len - FPU_REG_RAW_SIZE); | |
878 | } | |
879 | else | |
880 | { | |
881 | /* Convert the extended floating-point number found in | |
882 | %st(0) to the desired type. This is probably not exactly | |
883 | how it would happen on the target itself, but it is the | |
884 | best we can do. */ | |
885 | DOUBLEST val; | |
886 | floatformat_to_doublest (&floatformat_i387_ext, | |
887 | ®buf[REGISTER_BYTE (FP0_REGNUM)], &val); | |
888 | store_floating (valbuf, TYPE_LENGTH (type), val); | |
889 | } | |
c906108c SS |
890 | } |
891 | else | |
c5aa993b | 892 | { |
d4f3574e SS |
893 | int low_size = REGISTER_RAW_SIZE (LOW_RETURN_REGNUM); |
894 | int high_size = REGISTER_RAW_SIZE (HIGH_RETURN_REGNUM); | |
895 | ||
896 | if (len <= low_size) | |
1a309862 | 897 | memcpy (valbuf, ®buf[REGISTER_BYTE (LOW_RETURN_REGNUM)], len); |
d4f3574e SS |
898 | else if (len <= (low_size + high_size)) |
899 | { | |
900 | memcpy (valbuf, | |
1a309862 | 901 | ®buf[REGISTER_BYTE (LOW_RETURN_REGNUM)], low_size); |
d4f3574e | 902 | memcpy (valbuf + low_size, |
1a309862 | 903 | ®buf[REGISTER_BYTE (HIGH_RETURN_REGNUM)], len - low_size); |
d4f3574e SS |
904 | } |
905 | else | |
8e65ff28 AC |
906 | internal_error (__FILE__, __LINE__, |
907 | "Cannot extract return value of %d bytes long.", len); | |
c906108c SS |
908 | } |
909 | } | |
910 | ||
ef9dff19 MK |
911 | /* Write into the appropriate registers a function return value stored |
912 | in VALBUF of type TYPE, given in virtual format. */ | |
913 | ||
914 | void | |
915 | i386_store_return_value (struct type *type, char *valbuf) | |
916 | { | |
917 | int len = TYPE_LENGTH (type); | |
918 | ||
1e8d0a7b MK |
919 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
920 | && TYPE_NFIELDS (type) == 1) | |
3df1b9b4 MK |
921 | { |
922 | i386_store_return_value (TYPE_FIELD_TYPE (type, 0), valbuf); | |
923 | return; | |
924 | } | |
1e8d0a7b MK |
925 | |
926 | if (TYPE_CODE (type) == TYPE_CODE_FLT) | |
ef9dff19 | 927 | { |
ccb945b8 MK |
928 | unsigned int fstat; |
929 | ||
ef9dff19 MK |
930 | if (NUM_FREGS == 0) |
931 | { | |
932 | warning ("Cannot set floating-point return value."); | |
933 | return; | |
934 | } | |
935 | ||
635b0cc1 MK |
936 | /* Returning floating-point values is a bit tricky. Apart from |
937 | storing the return value in %st(0), we have to simulate the | |
938 | state of the FPU at function return point. */ | |
939 | ||
ef9dff19 MK |
940 | if (len == TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT |
941 | && TARGET_LONG_DOUBLE_FORMAT == &floatformat_i387_ext) | |
942 | { | |
943 | /* Copy straight over. */ | |
944 | write_register_bytes (REGISTER_BYTE (FP0_REGNUM), valbuf, | |
945 | FPU_REG_RAW_SIZE); | |
946 | } | |
947 | else | |
948 | { | |
949 | char buf[FPU_REG_RAW_SIZE]; | |
950 | DOUBLEST val; | |
951 | ||
952 | /* Convert the value found in VALBUF to the extended | |
635b0cc1 | 953 | floating-point format used by the FPU. This is probably |
ef9dff19 MK |
954 | not exactly how it would happen on the target itself, but |
955 | it is the best we can do. */ | |
956 | val = extract_floating (valbuf, TYPE_LENGTH (type)); | |
957 | floatformat_from_doublest (&floatformat_i387_ext, &val, buf); | |
958 | write_register_bytes (REGISTER_BYTE (FP0_REGNUM), buf, | |
959 | FPU_REG_RAW_SIZE); | |
960 | } | |
ccb945b8 | 961 | |
635b0cc1 MK |
962 | /* Set the top of the floating-point register stack to 7. The |
963 | actual value doesn't really matter, but 7 is what a normal | |
964 | function return would end up with if the program started out | |
965 | with a freshly initialized FPU. */ | |
ccb945b8 MK |
966 | fstat = read_register (FSTAT_REGNUM); |
967 | fstat |= (7 << 11); | |
968 | write_register (FSTAT_REGNUM, fstat); | |
969 | ||
635b0cc1 MK |
970 | /* Mark %st(1) through %st(7) as empty. Since we set the top of |
971 | the floating-point register stack to 7, the appropriate value | |
972 | for the tag word is 0x3fff. */ | |
ccb945b8 | 973 | write_register (FTAG_REGNUM, 0x3fff); |
ef9dff19 MK |
974 | } |
975 | else | |
976 | { | |
977 | int low_size = REGISTER_RAW_SIZE (LOW_RETURN_REGNUM); | |
978 | int high_size = REGISTER_RAW_SIZE (HIGH_RETURN_REGNUM); | |
979 | ||
980 | if (len <= low_size) | |
981 | write_register_bytes (REGISTER_BYTE (LOW_RETURN_REGNUM), valbuf, len); | |
982 | else if (len <= (low_size + high_size)) | |
983 | { | |
984 | write_register_bytes (REGISTER_BYTE (LOW_RETURN_REGNUM), | |
985 | valbuf, low_size); | |
986 | write_register_bytes (REGISTER_BYTE (HIGH_RETURN_REGNUM), | |
987 | valbuf + low_size, len - low_size); | |
988 | } | |
989 | else | |
8e65ff28 AC |
990 | internal_error (__FILE__, __LINE__, |
991 | "Cannot store return value of %d bytes long.", len); | |
ef9dff19 MK |
992 | } |
993 | } | |
f7af9647 MK |
994 | |
995 | /* Extract from an array REGBUF containing the (raw) register state | |
996 | the address in which a function should return its structure value, | |
997 | as a CORE_ADDR. */ | |
998 | ||
999 | CORE_ADDR | |
1000 | i386_extract_struct_value_address (char *regbuf) | |
1001 | { | |
1002 | return extract_address (®buf[REGISTER_BYTE (LOW_RETURN_REGNUM)], | |
1003 | REGISTER_RAW_SIZE (LOW_RETURN_REGNUM)); | |
1004 | } | |
fc338970 | 1005 | \f |
ef9dff19 | 1006 | |
d7a0d72c MK |
1007 | /* Return the GDB type object for the "standard" data type of data in |
1008 | register REGNUM. Perhaps %esi and %edi should go here, but | |
1009 | potentially they could be used for things other than address. */ | |
1010 | ||
1011 | struct type * | |
1012 | i386_register_virtual_type (int regnum) | |
1013 | { | |
1014 | if (regnum == PC_REGNUM || regnum == FP_REGNUM || regnum == SP_REGNUM) | |
1015 | return lookup_pointer_type (builtin_type_void); | |
1016 | ||
1017 | if (IS_FP_REGNUM (regnum)) | |
1018 | return builtin_type_long_double; | |
1019 | ||
1020 | if (IS_SSE_REGNUM (regnum)) | |
1021 | return builtin_type_v4sf; | |
1022 | ||
1023 | return builtin_type_int; | |
1024 | } | |
1025 | ||
1026 | /* Return true iff register REGNUM's virtual format is different from | |
1027 | its raw format. Note that this definition assumes that the host | |
1028 | supports IEEE 32-bit floats, since it doesn't say that SSE | |
1029 | registers need conversion. Even if we can't find a counterexample, | |
1030 | this is still sloppy. */ | |
1031 | ||
1032 | int | |
1033 | i386_register_convertible (int regnum) | |
1034 | { | |
1035 | return IS_FP_REGNUM (regnum); | |
1036 | } | |
1037 | ||
ac27f131 | 1038 | /* Convert data from raw format for register REGNUM in buffer FROM to |
3d261580 | 1039 | virtual format with type TYPE in buffer TO. */ |
ac27f131 MK |
1040 | |
1041 | void | |
1042 | i386_register_convert_to_virtual (int regnum, struct type *type, | |
1043 | char *from, char *to) | |
1044 | { | |
3d261580 MK |
1045 | char buf[12]; |
1046 | DOUBLEST d; | |
1047 | ||
1048 | /* We only support floating-point values. */ | |
1049 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_FLT); | |
1050 | ||
1051 | /* First add the necessary padding. */ | |
1052 | memcpy (buf, from, FPU_REG_RAW_SIZE); | |
1053 | memset (buf + FPU_REG_RAW_SIZE, 0, sizeof buf - FPU_REG_RAW_SIZE); | |
1054 | ||
1055 | /* Convert to TYPE. This should be a no-op, if TYPE is equivalent | |
1056 | to the extended floating-point format used by the FPU. */ | |
1057 | d = extract_floating (buf, sizeof buf); | |
1058 | store_floating (to, TYPE_LENGTH (type), d); | |
ac27f131 MK |
1059 | } |
1060 | ||
1061 | /* Convert data from virtual format with type TYPE in buffer FROM to | |
3d261580 | 1062 | raw format for register REGNUM in buffer TO. */ |
ac27f131 MK |
1063 | |
1064 | void | |
1065 | i386_register_convert_to_raw (struct type *type, int regnum, | |
1066 | char *from, char *to) | |
1067 | { | |
3d261580 MK |
1068 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_FLT |
1069 | && TYPE_LENGTH (type) == 12); | |
1070 | ||
1071 | /* Simply omit the two unused bytes. */ | |
ac27f131 MK |
1072 | memcpy (to, from, FPU_REG_RAW_SIZE); |
1073 | } | |
ac27f131 | 1074 | \f |
fc338970 | 1075 | |
c906108c | 1076 | #ifdef I386V4_SIGTRAMP_SAVED_PC |
fc338970 MK |
1077 | /* Get saved user PC for sigtramp from the pushed ucontext on the |
1078 | stack for all three variants of SVR4 sigtramps. */ | |
c906108c SS |
1079 | |
1080 | CORE_ADDR | |
fba45db2 | 1081 | i386v4_sigtramp_saved_pc (struct frame_info *frame) |
c906108c SS |
1082 | { |
1083 | CORE_ADDR saved_pc_offset = 4; | |
1084 | char *name = NULL; | |
1085 | ||
1086 | find_pc_partial_function (frame->pc, &name, NULL, NULL); | |
1087 | if (name) | |
1088 | { | |
1089 | if (STREQ (name, "_sigreturn")) | |
1090 | saved_pc_offset = 132 + 14 * 4; | |
1091 | else if (STREQ (name, "_sigacthandler")) | |
1092 | saved_pc_offset = 80 + 14 * 4; | |
1093 | else if (STREQ (name, "sigvechandler")) | |
1094 | saved_pc_offset = 120 + 14 * 4; | |
1095 | } | |
1096 | ||
1097 | if (frame->next) | |
1098 | return read_memory_integer (frame->next->frame + saved_pc_offset, 4); | |
1099 | return read_memory_integer (read_register (SP_REGNUM) + saved_pc_offset, 4); | |
1100 | } | |
1101 | #endif /* I386V4_SIGTRAMP_SAVED_PC */ | |
fc338970 | 1102 | \f |
a0b3c4fd | 1103 | |
c906108c | 1104 | #ifdef STATIC_TRANSFORM_NAME |
fc338970 MK |
1105 | /* SunPRO encodes the static variables. This is not related to C++ |
1106 | mangling, it is done for C too. */ | |
c906108c SS |
1107 | |
1108 | char * | |
fba45db2 | 1109 | sunpro_static_transform_name (char *name) |
c906108c SS |
1110 | { |
1111 | char *p; | |
1112 | if (IS_STATIC_TRANSFORM_NAME (name)) | |
1113 | { | |
fc338970 MK |
1114 | /* For file-local statics there will be a period, a bunch of |
1115 | junk (the contents of which match a string given in the | |
c5aa993b JM |
1116 | N_OPT), a period and the name. For function-local statics |
1117 | there will be a bunch of junk (which seems to change the | |
1118 | second character from 'A' to 'B'), a period, the name of the | |
1119 | function, and the name. So just skip everything before the | |
1120 | last period. */ | |
c906108c SS |
1121 | p = strrchr (name, '.'); |
1122 | if (p != NULL) | |
1123 | name = p + 1; | |
1124 | } | |
1125 | return name; | |
1126 | } | |
1127 | #endif /* STATIC_TRANSFORM_NAME */ | |
fc338970 | 1128 | \f |
c906108c | 1129 | |
fc338970 | 1130 | /* Stuff for WIN32 PE style DLL's but is pretty generic really. */ |
c906108c SS |
1131 | |
1132 | CORE_ADDR | |
fba45db2 | 1133 | skip_trampoline_code (CORE_ADDR pc, char *name) |
c906108c | 1134 | { |
fc338970 | 1135 | if (pc && read_memory_unsigned_integer (pc, 2) == 0x25ff) /* jmp *(dest) */ |
c906108c | 1136 | { |
c5aa993b | 1137 | unsigned long indirect = read_memory_unsigned_integer (pc + 2, 4); |
c906108c | 1138 | struct minimal_symbol *indsym = |
fc338970 | 1139 | indirect ? lookup_minimal_symbol_by_pc (indirect) : 0; |
c5aa993b | 1140 | char *symname = indsym ? SYMBOL_NAME (indsym) : 0; |
c906108c | 1141 | |
c5aa993b | 1142 | if (symname) |
c906108c | 1143 | { |
c5aa993b JM |
1144 | if (strncmp (symname, "__imp_", 6) == 0 |
1145 | || strncmp (symname, "_imp_", 5) == 0) | |
c906108c SS |
1146 | return name ? 1 : read_memory_unsigned_integer (indirect, 4); |
1147 | } | |
1148 | } | |
fc338970 | 1149 | return 0; /* Not a trampoline. */ |
c906108c | 1150 | } |
fc338970 MK |
1151 | \f |
1152 | ||
1153 | /* We have two flavours of disassembly. The machinery on this page | |
1154 | deals with switching between those. */ | |
c906108c SS |
1155 | |
1156 | static int | |
fba45db2 | 1157 | gdb_print_insn_i386 (bfd_vma memaddr, disassemble_info *info) |
c906108c SS |
1158 | { |
1159 | if (disassembly_flavor == att_flavor) | |
1160 | return print_insn_i386_att (memaddr, info); | |
1161 | else if (disassembly_flavor == intel_flavor) | |
1162 | return print_insn_i386_intel (memaddr, info); | |
fc338970 MK |
1163 | /* Never reached -- disassembly_flavour is always either att_flavor |
1164 | or intel_flavor. */ | |
e1e9e218 | 1165 | internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
7a292a7a SS |
1166 | } |
1167 | ||
fc338970 MK |
1168 | /* If the disassembly mode is intel, we have to also switch the bfd |
1169 | mach_type. This function is run in the set disassembly_flavor | |
7a292a7a SS |
1170 | command, and does that. */ |
1171 | ||
1172 | static void | |
fba45db2 KB |
1173 | set_disassembly_flavor_sfunc (char *args, int from_tty, |
1174 | struct cmd_list_element *c) | |
7a292a7a SS |
1175 | { |
1176 | set_disassembly_flavor (); | |
7a292a7a SS |
1177 | } |
1178 | ||
1179 | static void | |
fba45db2 | 1180 | set_disassembly_flavor (void) |
7a292a7a SS |
1181 | { |
1182 | if (disassembly_flavor == att_flavor) | |
1183 | set_architecture_from_arch_mach (bfd_arch_i386, bfd_mach_i386_i386); | |
1184 | else if (disassembly_flavor == intel_flavor) | |
fc338970 MK |
1185 | set_architecture_from_arch_mach (bfd_arch_i386, |
1186 | bfd_mach_i386_i386_intel_syntax); | |
c906108c | 1187 | } |
fc338970 | 1188 | \f |
2acceee2 | 1189 | |
28e9e0f0 MK |
1190 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1191 | void _initialize_i386_tdep (void); | |
1192 | ||
c906108c | 1193 | void |
fba45db2 | 1194 | _initialize_i386_tdep (void) |
c906108c | 1195 | { |
917317f4 JM |
1196 | /* Initialize the table saying where each register starts in the |
1197 | register file. */ | |
1198 | { | |
1199 | int i, offset; | |
1200 | ||
1201 | offset = 0; | |
1202 | for (i = 0; i < MAX_NUM_REGS; i++) | |
1203 | { | |
1204 | i386_register_byte[i] = offset; | |
1205 | offset += i386_register_raw_size[i]; | |
1206 | } | |
1207 | } | |
1208 | ||
1209 | /* Initialize the table of virtual register sizes. */ | |
1210 | { | |
1211 | int i; | |
1212 | ||
1213 | for (i = 0; i < MAX_NUM_REGS; i++) | |
1214 | i386_register_virtual_size[i] = TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (i)); | |
1215 | } | |
c5aa993b | 1216 | |
c906108c SS |
1217 | tm_print_insn = gdb_print_insn_i386; |
1218 | tm_print_insn_info.mach = bfd_lookup_arch (bfd_arch_i386, 0)->mach; | |
1219 | ||
fc338970 | 1220 | /* Add the variable that controls the disassembly flavor. */ |
917317f4 JM |
1221 | { |
1222 | struct cmd_list_element *new_cmd; | |
7a292a7a | 1223 | |
917317f4 JM |
1224 | new_cmd = add_set_enum_cmd ("disassembly-flavor", no_class, |
1225 | valid_flavors, | |
1ed2a135 | 1226 | &disassembly_flavor, |
fc338970 MK |
1227 | "\ |
1228 | Set the disassembly flavor, the valid values are \"att\" and \"intel\", \ | |
c906108c | 1229 | and the default value is \"att\".", |
917317f4 JM |
1230 | &setlist); |
1231 | new_cmd->function.sfunc = set_disassembly_flavor_sfunc; | |
1232 | add_show_from_set (new_cmd, &showlist); | |
1233 | } | |
c5aa993b | 1234 | |
7a292a7a | 1235 | /* Finally, initialize the disassembly flavor to the default given |
fc338970 | 1236 | in the disassembly_flavor variable. */ |
7a292a7a | 1237 | set_disassembly_flavor (); |
c906108c | 1238 | } |