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" |
d16aafd8 | 35 | #include "doublest.h" |
c906108c | 36 | |
3d261580 MK |
37 | #include "gdb_assert.h" |
38 | ||
917317f4 JM |
39 | /* i386_register_byte[i] is the offset into the register file of the |
40 | start of register number i. We initialize this from | |
41 | i386_register_raw_size. */ | |
42 | int i386_register_byte[MAX_NUM_REGS]; | |
43 | ||
ceb4951f JB |
44 | /* i386_register_raw_size[i] is the number of bytes of storage in |
45 | GDB's register array occupied by register i. */ | |
917317f4 JM |
46 | int i386_register_raw_size[MAX_NUM_REGS] = { |
47 | 4, 4, 4, 4, | |
48 | 4, 4, 4, 4, | |
49 | 4, 4, 4, 4, | |
50 | 4, 4, 4, 4, | |
51 | 10, 10, 10, 10, | |
52 | 10, 10, 10, 10, | |
53 | 4, 4, 4, 4, | |
54 | 4, 4, 4, 4, | |
55 | 16, 16, 16, 16, | |
56 | 16, 16, 16, 16, | |
57 | 4 | |
58 | }; | |
59 | ||
60 | /* i386_register_virtual_size[i] is the size in bytes of the virtual | |
61 | type of register i. */ | |
62 | int i386_register_virtual_size[MAX_NUM_REGS]; | |
85540d8c MK |
63 | |
64 | /* Convert stabs register number REG to the appropriate register | |
65 | number used by GDB. */ | |
66 | ||
67 | int | |
68 | i386_stab_reg_to_regnum (int reg) | |
69 | { | |
70 | /* This implements what GCC calls the "default" register map. */ | |
71 | if (reg >= 0 && reg <= 7) | |
72 | { | |
73 | /* General registers. */ | |
74 | return reg; | |
75 | } | |
76 | else if (reg >= 12 && reg <= 19) | |
77 | { | |
78 | /* Floating-point registers. */ | |
79 | return reg - 12 + FP0_REGNUM; | |
80 | } | |
81 | else if (reg >= 21 && reg <= 28) | |
82 | { | |
83 | /* SSE registers. */ | |
84 | return reg - 21 + XMM0_REGNUM; | |
85 | } | |
86 | else if (reg >= 29 && reg <= 36) | |
87 | { | |
88 | /* MMX registers. */ | |
89 | /* FIXME: kettenis/2001-07-28: Should we have the MMX registers | |
90 | as pseudo-registers? */ | |
91 | return reg - 29 + FP0_REGNUM; | |
92 | } | |
93 | ||
94 | /* This will hopefully provoke a warning. */ | |
95 | return NUM_REGS + NUM_PSEUDO_REGS; | |
96 | } | |
97 | ||
98 | /* Convert Dwarf register number REG to the appropriate register | |
99 | number used by GDB. */ | |
100 | ||
101 | int | |
102 | i386_dwarf_reg_to_regnum (int reg) | |
103 | { | |
104 | /* The DWARF register numbering includes %eip and %eflags, and | |
105 | numbers the floating point registers differently. */ | |
106 | if (reg >= 0 && reg <= 9) | |
107 | { | |
108 | /* General registers. */ | |
109 | return reg; | |
110 | } | |
111 | else if (reg >= 11 && reg <= 18) | |
112 | { | |
113 | /* Floating-point registers. */ | |
114 | return reg - 11 + FP0_REGNUM; | |
115 | } | |
116 | else if (reg >= 21) | |
117 | { | |
118 | /* The SSE and MMX registers have identical numbers as in stabs. */ | |
119 | return i386_stab_reg_to_regnum (reg); | |
120 | } | |
121 | ||
122 | /* This will hopefully provoke a warning. */ | |
123 | return NUM_REGS + NUM_PSEUDO_REGS; | |
124 | } | |
fc338970 | 125 | \f |
917317f4 | 126 | |
fc338970 MK |
127 | /* This is the variable that is set with "set disassembly-flavor", and |
128 | its legitimate values. */ | |
53904c9e AC |
129 | static const char att_flavor[] = "att"; |
130 | static const char intel_flavor[] = "intel"; | |
131 | static const char *valid_flavors[] = | |
c5aa993b | 132 | { |
c906108c SS |
133 | att_flavor, |
134 | intel_flavor, | |
135 | NULL | |
136 | }; | |
53904c9e | 137 | static const char *disassembly_flavor = att_flavor; |
c906108c | 138 | |
fc338970 MK |
139 | /* This is used to keep the bfd arch_info in sync with the disassembly |
140 | flavor. */ | |
a14ed312 KB |
141 | static void set_disassembly_flavor_sfunc (char *, int, |
142 | struct cmd_list_element *); | |
143 | static void set_disassembly_flavor (void); | |
fc338970 MK |
144 | \f |
145 | ||
146 | /* Stdio style buffering was used to minimize calls to ptrace, but | |
147 | this buffering did not take into account that the code section | |
148 | being accessed may not be an even number of buffers long (even if | |
149 | the buffer is only sizeof(int) long). In cases where the code | |
150 | section size happened to be a non-integral number of buffers long, | |
151 | attempting to read the last buffer would fail. Simply using | |
152 | target_read_memory and ignoring errors, rather than read_memory, is | |
153 | not the correct solution, since legitimate access errors would then | |
154 | be totally ignored. To properly handle this situation and continue | |
155 | to use buffering would require that this code be able to determine | |
156 | the minimum code section size granularity (not the alignment of the | |
157 | section itself, since the actual failing case that pointed out this | |
158 | problem had a section alignment of 4 but was not a multiple of 4 | |
159 | bytes long), on a target by target basis, and then adjust it's | |
160 | buffer size accordingly. This is messy, but potentially feasible. | |
161 | It probably needs the bfd library's help and support. For now, the | |
162 | buffer size is set to 1. (FIXME -fnf) */ | |
163 | ||
164 | #define CODESTREAM_BUFSIZ 1 /* Was sizeof(int), see note above. */ | |
c906108c SS |
165 | static CORE_ADDR codestream_next_addr; |
166 | static CORE_ADDR codestream_addr; | |
167 | static unsigned char codestream_buf[CODESTREAM_BUFSIZ]; | |
168 | static int codestream_off; | |
169 | static int codestream_cnt; | |
170 | ||
171 | #define codestream_tell() (codestream_addr + codestream_off) | |
fc338970 MK |
172 | #define codestream_peek() \ |
173 | (codestream_cnt == 0 ? \ | |
174 | codestream_fill(1) : codestream_buf[codestream_off]) | |
175 | #define codestream_get() \ | |
176 | (codestream_cnt-- == 0 ? \ | |
177 | codestream_fill(0) : codestream_buf[codestream_off++]) | |
c906108c | 178 | |
c5aa993b | 179 | static unsigned char |
fba45db2 | 180 | codestream_fill (int peek_flag) |
c906108c SS |
181 | { |
182 | codestream_addr = codestream_next_addr; | |
183 | codestream_next_addr += CODESTREAM_BUFSIZ; | |
184 | codestream_off = 0; | |
185 | codestream_cnt = CODESTREAM_BUFSIZ; | |
186 | read_memory (codestream_addr, (char *) codestream_buf, CODESTREAM_BUFSIZ); | |
c5aa993b | 187 | |
c906108c | 188 | if (peek_flag) |
c5aa993b | 189 | return (codestream_peek ()); |
c906108c | 190 | else |
c5aa993b | 191 | return (codestream_get ()); |
c906108c SS |
192 | } |
193 | ||
194 | static void | |
fba45db2 | 195 | codestream_seek (CORE_ADDR place) |
c906108c SS |
196 | { |
197 | codestream_next_addr = place / CODESTREAM_BUFSIZ; | |
198 | codestream_next_addr *= CODESTREAM_BUFSIZ; | |
199 | codestream_cnt = 0; | |
200 | codestream_fill (1); | |
c5aa993b | 201 | while (codestream_tell () != place) |
c906108c SS |
202 | codestream_get (); |
203 | } | |
204 | ||
205 | static void | |
fba45db2 | 206 | codestream_read (unsigned char *buf, int count) |
c906108c SS |
207 | { |
208 | unsigned char *p; | |
209 | int i; | |
210 | p = buf; | |
211 | for (i = 0; i < count; i++) | |
212 | *p++ = codestream_get (); | |
213 | } | |
fc338970 | 214 | \f |
c906108c | 215 | |
fc338970 | 216 | /* If the next instruction is a jump, move to its target. */ |
c906108c SS |
217 | |
218 | static void | |
fba45db2 | 219 | i386_follow_jump (void) |
c906108c SS |
220 | { |
221 | unsigned char buf[4]; | |
222 | long delta; | |
223 | ||
224 | int data16; | |
225 | CORE_ADDR pos; | |
226 | ||
227 | pos = codestream_tell (); | |
228 | ||
229 | data16 = 0; | |
230 | if (codestream_peek () == 0x66) | |
231 | { | |
232 | codestream_get (); | |
233 | data16 = 1; | |
234 | } | |
235 | ||
236 | switch (codestream_get ()) | |
237 | { | |
238 | case 0xe9: | |
fc338970 | 239 | /* Relative jump: if data16 == 0, disp32, else disp16. */ |
c906108c SS |
240 | if (data16) |
241 | { | |
242 | codestream_read (buf, 2); | |
243 | delta = extract_signed_integer (buf, 2); | |
244 | ||
fc338970 MK |
245 | /* Include the size of the jmp instruction (including the |
246 | 0x66 prefix). */ | |
c5aa993b | 247 | pos += delta + 4; |
c906108c SS |
248 | } |
249 | else | |
250 | { | |
251 | codestream_read (buf, 4); | |
252 | delta = extract_signed_integer (buf, 4); | |
253 | ||
254 | pos += delta + 5; | |
255 | } | |
256 | break; | |
257 | case 0xeb: | |
fc338970 | 258 | /* Relative jump, disp8 (ignore data16). */ |
c906108c SS |
259 | codestream_read (buf, 1); |
260 | /* Sign-extend it. */ | |
261 | delta = extract_signed_integer (buf, 1); | |
262 | ||
263 | pos += delta + 2; | |
264 | break; | |
265 | } | |
266 | codestream_seek (pos); | |
267 | } | |
268 | ||
fc338970 MK |
269 | /* Find & return the amount a local space allocated, and advance the |
270 | codestream to the first register push (if any). | |
271 | ||
272 | If the entry sequence doesn't make sense, return -1, and leave | |
273 | codestream pointer at a random spot. */ | |
c906108c SS |
274 | |
275 | static long | |
fba45db2 | 276 | i386_get_frame_setup (CORE_ADDR pc) |
c906108c SS |
277 | { |
278 | unsigned char op; | |
279 | ||
280 | codestream_seek (pc); | |
281 | ||
282 | i386_follow_jump (); | |
283 | ||
284 | op = codestream_get (); | |
285 | ||
286 | if (op == 0x58) /* popl %eax */ | |
287 | { | |
fc338970 MK |
288 | /* This function must start with |
289 | ||
290 | popl %eax 0x58 | |
291 | xchgl %eax, (%esp) 0x87 0x04 0x24 | |
292 | or xchgl %eax, 0(%esp) 0x87 0x44 0x24 0x00 | |
293 | ||
294 | (the System V compiler puts out the second `xchg' | |
295 | instruction, and the assembler doesn't try to optimize it, so | |
296 | the 'sib' form gets generated). This sequence is used to get | |
297 | the address of the return buffer for a function that returns | |
298 | a structure. */ | |
c906108c SS |
299 | int pos; |
300 | unsigned char buf[4]; | |
fc338970 MK |
301 | static unsigned char proto1[3] = { 0x87, 0x04, 0x24 }; |
302 | static unsigned char proto2[4] = { 0x87, 0x44, 0x24, 0x00 }; | |
303 | ||
c906108c SS |
304 | pos = codestream_tell (); |
305 | codestream_read (buf, 4); | |
306 | if (memcmp (buf, proto1, 3) == 0) | |
307 | pos += 3; | |
308 | else if (memcmp (buf, proto2, 4) == 0) | |
309 | pos += 4; | |
310 | ||
311 | codestream_seek (pos); | |
fc338970 | 312 | op = codestream_get (); /* Update next opcode. */ |
c906108c SS |
313 | } |
314 | ||
315 | if (op == 0x68 || op == 0x6a) | |
316 | { | |
fc338970 MK |
317 | /* This function may start with |
318 | ||
319 | pushl constant | |
320 | call _probe | |
321 | addl $4, %esp | |
322 | ||
323 | followed by | |
324 | ||
325 | pushl %ebp | |
326 | ||
327 | etc. */ | |
c906108c SS |
328 | int pos; |
329 | unsigned char buf[8]; | |
330 | ||
fc338970 | 331 | /* Skip past the `pushl' instruction; it has either a one-byte |
c906108c SS |
332 | or a four-byte operand, depending on the opcode. */ |
333 | pos = codestream_tell (); | |
334 | if (op == 0x68) | |
335 | pos += 4; | |
336 | else | |
337 | pos += 1; | |
338 | codestream_seek (pos); | |
339 | ||
fc338970 MK |
340 | /* Read the following 8 bytes, which should be "call _probe" (6 |
341 | bytes) followed by "addl $4,%esp" (2 bytes). */ | |
c906108c SS |
342 | codestream_read (buf, sizeof (buf)); |
343 | if (buf[0] == 0xe8 && buf[6] == 0xc4 && buf[7] == 0x4) | |
344 | pos += sizeof (buf); | |
345 | codestream_seek (pos); | |
fc338970 | 346 | op = codestream_get (); /* Update next opcode. */ |
c906108c SS |
347 | } |
348 | ||
349 | if (op == 0x55) /* pushl %ebp */ | |
c5aa993b | 350 | { |
fc338970 | 351 | /* Check for "movl %esp, %ebp" -- can be written in two ways. */ |
c906108c SS |
352 | switch (codestream_get ()) |
353 | { | |
354 | case 0x8b: | |
355 | if (codestream_get () != 0xec) | |
fc338970 | 356 | return -1; |
c906108c SS |
357 | break; |
358 | case 0x89: | |
359 | if (codestream_get () != 0xe5) | |
fc338970 | 360 | return -1; |
c906108c SS |
361 | break; |
362 | default: | |
fc338970 | 363 | return -1; |
c906108c | 364 | } |
fc338970 MK |
365 | /* Check for stack adjustment |
366 | ||
367 | subl $XXX, %esp | |
368 | ||
369 | NOTE: You can't subtract a 16 bit immediate from a 32 bit | |
370 | reg, so we don't have to worry about a data16 prefix. */ | |
c906108c SS |
371 | op = codestream_peek (); |
372 | if (op == 0x83) | |
373 | { | |
fc338970 | 374 | /* `subl' with 8 bit immediate. */ |
c906108c SS |
375 | codestream_get (); |
376 | if (codestream_get () != 0xec) | |
fc338970 | 377 | /* Some instruction starting with 0x83 other than `subl'. */ |
c906108c SS |
378 | { |
379 | codestream_seek (codestream_tell () - 2); | |
380 | return 0; | |
381 | } | |
fc338970 MK |
382 | /* `subl' with signed byte immediate (though it wouldn't |
383 | make sense to be negative). */ | |
c5aa993b | 384 | return (codestream_get ()); |
c906108c SS |
385 | } |
386 | else if (op == 0x81) | |
387 | { | |
388 | char buf[4]; | |
fc338970 | 389 | /* Maybe it is `subl' with a 32 bit immedediate. */ |
c5aa993b | 390 | codestream_get (); |
c906108c | 391 | if (codestream_get () != 0xec) |
fc338970 | 392 | /* Some instruction starting with 0x81 other than `subl'. */ |
c906108c SS |
393 | { |
394 | codestream_seek (codestream_tell () - 2); | |
395 | return 0; | |
396 | } | |
fc338970 | 397 | /* It is `subl' with a 32 bit immediate. */ |
c5aa993b | 398 | codestream_read ((unsigned char *) buf, 4); |
c906108c SS |
399 | return extract_signed_integer (buf, 4); |
400 | } | |
401 | else | |
402 | { | |
fc338970 | 403 | return 0; |
c906108c SS |
404 | } |
405 | } | |
406 | else if (op == 0xc8) | |
407 | { | |
408 | char buf[2]; | |
fc338970 | 409 | /* `enter' with 16 bit unsigned immediate. */ |
c5aa993b | 410 | codestream_read ((unsigned char *) buf, 2); |
fc338970 | 411 | codestream_get (); /* Flush final byte of enter instruction. */ |
c906108c SS |
412 | return extract_unsigned_integer (buf, 2); |
413 | } | |
414 | return (-1); | |
415 | } | |
416 | ||
c833a37e MK |
417 | /* Return the chain-pointer for FRAME. In the case of the i386, the |
418 | frame's nominal address is the address of a 4-byte word containing | |
419 | the calling frame's address. */ | |
420 | ||
421 | CORE_ADDR | |
422 | i386_frame_chain (struct frame_info *frame) | |
423 | { | |
424 | if (frame->signal_handler_caller) | |
425 | return frame->frame; | |
426 | ||
427 | if (! inside_entry_file (frame->pc)) | |
428 | return read_memory_unsigned_integer (frame->frame, 4); | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
539ffe0b MK |
433 | /* Determine whether the function invocation represented by FRAME does |
434 | not have a from on the stack associated with it. If it does not, | |
435 | return non-zero, otherwise return zero. */ | |
436 | ||
437 | int | |
438 | i386_frameless_function_invocation (struct frame_info *frame) | |
439 | { | |
440 | if (frame->signal_handler_caller) | |
441 | return 0; | |
442 | ||
443 | return frameless_look_for_prologue (frame); | |
444 | } | |
445 | ||
0d17c81d MK |
446 | /* Return the saved program counter for FRAME. */ |
447 | ||
448 | CORE_ADDR | |
449 | i386_frame_saved_pc (struct frame_info *frame) | |
450 | { | |
451 | /* FIXME: kettenis/2001-05-09: Conditionalizing the next bit of code | |
452 | on SIGCONTEXT_PC_OFFSET and I386V4_SIGTRAMP_SAVED_PC should be | |
453 | considered a temporary hack. I plan to come up with something | |
454 | better when we go multi-arch. */ | |
455 | #if defined (SIGCONTEXT_PC_OFFSET) || defined (I386V4_SIGTRAMP_SAVED_PC) | |
456 | if (frame->signal_handler_caller) | |
457 | return sigtramp_saved_pc (frame); | |
458 | #endif | |
459 | ||
460 | return read_memory_unsigned_integer (frame->frame + 4, 4); | |
461 | } | |
462 | ||
ed84f6c1 MK |
463 | /* Immediately after a function call, return the saved pc. */ |
464 | ||
465 | CORE_ADDR | |
466 | i386_saved_pc_after_call (struct frame_info *frame) | |
467 | { | |
468 | return read_memory_unsigned_integer (read_register (SP_REGNUM), 4); | |
469 | } | |
470 | ||
c906108c SS |
471 | /* Return number of args passed to a frame. |
472 | Can return -1, meaning no way to tell. */ | |
473 | ||
474 | int | |
fba45db2 | 475 | i386_frame_num_args (struct frame_info *fi) |
c906108c SS |
476 | { |
477 | #if 1 | |
478 | return -1; | |
479 | #else | |
480 | /* This loses because not only might the compiler not be popping the | |
fc338970 MK |
481 | args right after the function call, it might be popping args from |
482 | both this call and a previous one, and we would say there are | |
483 | more args than there really are. */ | |
c906108c | 484 | |
c5aa993b JM |
485 | int retpc; |
486 | unsigned char op; | |
c906108c SS |
487 | struct frame_info *pfi; |
488 | ||
fc338970 | 489 | /* On the i386, the instruction following the call could be: |
c906108c SS |
490 | popl %ecx - one arg |
491 | addl $imm, %esp - imm/4 args; imm may be 8 or 32 bits | |
fc338970 | 492 | anything else - zero args. */ |
c906108c SS |
493 | |
494 | int frameless; | |
495 | ||
392a587b | 496 | frameless = FRAMELESS_FUNCTION_INVOCATION (fi); |
c906108c | 497 | if (frameless) |
fc338970 MK |
498 | /* In the absence of a frame pointer, GDB doesn't get correct |
499 | values for nameless arguments. Return -1, so it doesn't print | |
500 | any nameless arguments. */ | |
c906108c SS |
501 | return -1; |
502 | ||
c5aa993b | 503 | pfi = get_prev_frame (fi); |
c906108c SS |
504 | if (pfi == 0) |
505 | { | |
fc338970 MK |
506 | /* NOTE: This can happen if we are looking at the frame for |
507 | main, because FRAME_CHAIN_VALID won't let us go into start. | |
508 | If we have debugging symbols, that's not really a big deal; | |
509 | it just means it will only show as many arguments to main as | |
510 | are declared. */ | |
c906108c SS |
511 | return -1; |
512 | } | |
513 | else | |
514 | { | |
c5aa993b JM |
515 | retpc = pfi->pc; |
516 | op = read_memory_integer (retpc, 1); | |
fc338970 | 517 | if (op == 0x59) /* pop %ecx */ |
c5aa993b | 518 | return 1; |
c906108c SS |
519 | else if (op == 0x83) |
520 | { | |
c5aa993b JM |
521 | op = read_memory_integer (retpc + 1, 1); |
522 | if (op == 0xc4) | |
523 | /* addl $<signed imm 8 bits>, %esp */ | |
524 | return (read_memory_integer (retpc + 2, 1) & 0xff) / 4; | |
c906108c SS |
525 | else |
526 | return 0; | |
527 | } | |
fc338970 MK |
528 | else if (op == 0x81) /* `add' with 32 bit immediate. */ |
529 | { | |
c5aa993b JM |
530 | op = read_memory_integer (retpc + 1, 1); |
531 | if (op == 0xc4) | |
532 | /* addl $<imm 32>, %esp */ | |
533 | return read_memory_integer (retpc + 2, 4) / 4; | |
c906108c SS |
534 | else |
535 | return 0; | |
536 | } | |
537 | else | |
538 | { | |
539 | return 0; | |
540 | } | |
541 | } | |
542 | #endif | |
543 | } | |
544 | ||
fc338970 MK |
545 | /* Parse the first few instructions the function to see what registers |
546 | were stored. | |
547 | ||
548 | We handle these cases: | |
549 | ||
550 | The startup sequence can be at the start of the function, or the | |
551 | function can start with a branch to startup code at the end. | |
552 | ||
553 | %ebp can be set up with either the 'enter' instruction, or "pushl | |
554 | %ebp, movl %esp, %ebp" (`enter' is too slow to be useful, but was | |
555 | once used in the System V compiler). | |
556 | ||
557 | Local space is allocated just below the saved %ebp by either the | |
558 | 'enter' instruction, or by "subl $<size>, %esp". 'enter' has a 16 | |
559 | bit unsigned argument for space to allocate, and the 'addl' | |
560 | instruction could have either a signed byte, or 32 bit immediate. | |
561 | ||
562 | Next, the registers used by this function are pushed. With the | |
563 | System V compiler they will always be in the order: %edi, %esi, | |
564 | %ebx (and sometimes a harmless bug causes it to also save but not | |
565 | restore %eax); however, the code below is willing to see the pushes | |
566 | in any order, and will handle up to 8 of them. | |
567 | ||
568 | If the setup sequence is at the end of the function, then the next | |
569 | instruction will be a branch back to the start. */ | |
c906108c SS |
570 | |
571 | void | |
fba45db2 | 572 | i386_frame_init_saved_regs (struct frame_info *fip) |
c906108c SS |
573 | { |
574 | long locals = -1; | |
575 | unsigned char op; | |
576 | CORE_ADDR dummy_bottom; | |
fc338970 | 577 | CORE_ADDR addr; |
c906108c SS |
578 | CORE_ADDR pc; |
579 | int i; | |
c5aa993b | 580 | |
1211c4e4 AC |
581 | if (fip->saved_regs) |
582 | return; | |
583 | ||
584 | frame_saved_regs_zalloc (fip); | |
c5aa993b | 585 | |
fc338970 MK |
586 | /* If the frame is the end of a dummy, compute where the beginning |
587 | would be. */ | |
c906108c | 588 | dummy_bottom = fip->frame - 4 - REGISTER_BYTES - CALL_DUMMY_LENGTH; |
c5aa993b | 589 | |
fc338970 | 590 | /* Check if the PC points in the stack, in a dummy frame. */ |
c5aa993b | 591 | if (dummy_bottom <= fip->pc && fip->pc <= fip->frame) |
c906108c | 592 | { |
fc338970 MK |
593 | /* All registers were saved by push_call_dummy. */ |
594 | addr = fip->frame; | |
c5aa993b | 595 | for (i = 0; i < NUM_REGS; i++) |
c906108c | 596 | { |
fc338970 MK |
597 | addr -= REGISTER_RAW_SIZE (i); |
598 | fip->saved_regs[i] = addr; | |
c906108c SS |
599 | } |
600 | return; | |
601 | } | |
c5aa993b | 602 | |
c906108c SS |
603 | pc = get_pc_function_start (fip->pc); |
604 | if (pc != 0) | |
605 | locals = i386_get_frame_setup (pc); | |
c5aa993b JM |
606 | |
607 | if (locals >= 0) | |
c906108c | 608 | { |
fc338970 | 609 | addr = fip->frame - 4 - locals; |
c5aa993b | 610 | for (i = 0; i < 8; i++) |
c906108c SS |
611 | { |
612 | op = codestream_get (); | |
613 | if (op < 0x50 || op > 0x57) | |
614 | break; | |
615 | #ifdef I386_REGNO_TO_SYMMETRY | |
616 | /* Dynix uses different internal numbering. Ick. */ | |
fc338970 | 617 | fip->saved_regs[I386_REGNO_TO_SYMMETRY (op - 0x50)] = addr; |
c906108c | 618 | #else |
fc338970 | 619 | fip->saved_regs[op - 0x50] = addr; |
c906108c | 620 | #endif |
fc338970 | 621 | addr -= 4; |
c906108c SS |
622 | } |
623 | } | |
c5aa993b | 624 | |
1211c4e4 AC |
625 | fip->saved_regs[PC_REGNUM] = fip->frame + 4; |
626 | fip->saved_regs[FP_REGNUM] = fip->frame; | |
c906108c SS |
627 | } |
628 | ||
fc338970 | 629 | /* Return PC of first real instruction. */ |
c906108c SS |
630 | |
631 | int | |
fba45db2 | 632 | i386_skip_prologue (int pc) |
c906108c SS |
633 | { |
634 | unsigned char op; | |
635 | int i; | |
c5aa993b | 636 | static unsigned char pic_pat[6] = |
fc338970 MK |
637 | { 0xe8, 0, 0, 0, 0, /* call 0x0 */ |
638 | 0x5b, /* popl %ebx */ | |
c5aa993b | 639 | }; |
c906108c | 640 | CORE_ADDR pos; |
c5aa993b | 641 | |
c906108c SS |
642 | if (i386_get_frame_setup (pc) < 0) |
643 | return (pc); | |
c5aa993b | 644 | |
fc338970 MK |
645 | /* Found valid frame setup -- codestream now points to start of push |
646 | instructions for saving registers. */ | |
c5aa993b | 647 | |
fc338970 | 648 | /* Skip over register saves. */ |
c906108c SS |
649 | for (i = 0; i < 8; i++) |
650 | { | |
651 | op = codestream_peek (); | |
fc338970 | 652 | /* Break if not `pushl' instrunction. */ |
c5aa993b | 653 | if (op < 0x50 || op > 0x57) |
c906108c SS |
654 | break; |
655 | codestream_get (); | |
656 | } | |
657 | ||
fc338970 MK |
658 | /* The native cc on SVR4 in -K PIC mode inserts the following code |
659 | to get the address of the global offset table (GOT) into register | |
660 | %ebx | |
661 | ||
662 | call 0x0 | |
663 | popl %ebx | |
664 | movl %ebx,x(%ebp) (optional) | |
665 | addl y,%ebx | |
666 | ||
c906108c SS |
667 | This code is with the rest of the prologue (at the end of the |
668 | function), so we have to skip it to get to the first real | |
669 | instruction at the start of the function. */ | |
c5aa993b | 670 | |
c906108c SS |
671 | pos = codestream_tell (); |
672 | for (i = 0; i < 6; i++) | |
673 | { | |
674 | op = codestream_get (); | |
c5aa993b | 675 | if (pic_pat[i] != op) |
c906108c SS |
676 | break; |
677 | } | |
678 | if (i == 6) | |
679 | { | |
680 | unsigned char buf[4]; | |
681 | long delta = 6; | |
682 | ||
683 | op = codestream_get (); | |
c5aa993b | 684 | if (op == 0x89) /* movl %ebx, x(%ebp) */ |
c906108c SS |
685 | { |
686 | op = codestream_get (); | |
fc338970 | 687 | if (op == 0x5d) /* One byte offset from %ebp. */ |
c906108c SS |
688 | { |
689 | delta += 3; | |
690 | codestream_read (buf, 1); | |
691 | } | |
fc338970 | 692 | else if (op == 0x9d) /* Four byte offset from %ebp. */ |
c906108c SS |
693 | { |
694 | delta += 6; | |
695 | codestream_read (buf, 4); | |
696 | } | |
fc338970 | 697 | else /* Unexpected instruction. */ |
c5aa993b JM |
698 | delta = -1; |
699 | op = codestream_get (); | |
c906108c | 700 | } |
c5aa993b JM |
701 | /* addl y,%ebx */ |
702 | if (delta > 0 && op == 0x81 && codestream_get () == 0xc3) | |
c906108c | 703 | { |
c5aa993b | 704 | pos += delta + 6; |
c906108c SS |
705 | } |
706 | } | |
707 | codestream_seek (pos); | |
c5aa993b | 708 | |
c906108c | 709 | i386_follow_jump (); |
c5aa993b | 710 | |
c906108c SS |
711 | return (codestream_tell ()); |
712 | } | |
713 | ||
714 | void | |
fba45db2 | 715 | i386_push_dummy_frame (void) |
c906108c SS |
716 | { |
717 | CORE_ADDR sp = read_register (SP_REGNUM); | |
718 | int regnum; | |
719 | char regbuf[MAX_REGISTER_RAW_SIZE]; | |
c5aa993b | 720 | |
c906108c SS |
721 | sp = push_word (sp, read_register (PC_REGNUM)); |
722 | sp = push_word (sp, read_register (FP_REGNUM)); | |
723 | write_register (FP_REGNUM, sp); | |
724 | for (regnum = 0; regnum < NUM_REGS; regnum++) | |
725 | { | |
726 | read_register_gen (regnum, regbuf); | |
727 | sp = push_bytes (sp, regbuf, REGISTER_RAW_SIZE (regnum)); | |
728 | } | |
729 | write_register (SP_REGNUM, sp); | |
730 | } | |
731 | ||
a7769679 MK |
732 | /* Insert the (relative) function address into the call sequence |
733 | stored at DYMMY. */ | |
734 | ||
735 | void | |
736 | i386_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs, | |
ea7c478f | 737 | struct value **args, struct type *type, int gcc_p) |
a7769679 MK |
738 | { |
739 | int from, to, delta, loc; | |
740 | ||
741 | loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); | |
742 | from = loc + 5; | |
743 | to = (int)(fun); | |
744 | delta = to - from; | |
745 | ||
746 | *((char *)(dummy) + 1) = (delta & 0xff); | |
747 | *((char *)(dummy) + 2) = ((delta >> 8) & 0xff); | |
748 | *((char *)(dummy) + 3) = ((delta >> 16) & 0xff); | |
749 | *((char *)(dummy) + 4) = ((delta >> 24) & 0xff); | |
750 | } | |
751 | ||
c906108c | 752 | void |
fba45db2 | 753 | i386_pop_frame (void) |
c906108c SS |
754 | { |
755 | struct frame_info *frame = get_current_frame (); | |
756 | CORE_ADDR fp; | |
757 | int regnum; | |
c906108c | 758 | char regbuf[MAX_REGISTER_RAW_SIZE]; |
c5aa993b | 759 | |
c906108c | 760 | fp = FRAME_FP (frame); |
1211c4e4 AC |
761 | i386_frame_init_saved_regs (frame); |
762 | ||
c5aa993b | 763 | for (regnum = 0; regnum < NUM_REGS; regnum++) |
c906108c | 764 | { |
fc338970 MK |
765 | CORE_ADDR addr; |
766 | addr = frame->saved_regs[regnum]; | |
767 | if (addr) | |
c906108c | 768 | { |
fc338970 | 769 | read_memory (addr, regbuf, REGISTER_RAW_SIZE (regnum)); |
c906108c SS |
770 | write_register_bytes (REGISTER_BYTE (regnum), regbuf, |
771 | REGISTER_RAW_SIZE (regnum)); | |
772 | } | |
773 | } | |
774 | write_register (FP_REGNUM, read_memory_integer (fp, 4)); | |
775 | write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); | |
776 | write_register (SP_REGNUM, fp + 8); | |
777 | flush_cached_frames (); | |
778 | } | |
fc338970 | 779 | \f |
c906108c SS |
780 | |
781 | #ifdef GET_LONGJMP_TARGET | |
782 | ||
fc338970 MK |
783 | /* Figure out where the longjmp will land. Slurp the args out of the |
784 | stack. We expect the first arg to be a pointer to the jmp_buf | |
785 | structure from which we extract the pc (JB_PC) that we will land | |
786 | at. The pc is copied into PC. This routine returns true on | |
787 | success. */ | |
c906108c SS |
788 | |
789 | int | |
fba45db2 | 790 | get_longjmp_target (CORE_ADDR *pc) |
c906108c SS |
791 | { |
792 | char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT]; | |
793 | CORE_ADDR sp, jb_addr; | |
794 | ||
795 | sp = read_register (SP_REGNUM); | |
796 | ||
fc338970 | 797 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack. */ |
c906108c SS |
798 | buf, |
799 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
800 | return 0; | |
801 | ||
802 | jb_addr = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
803 | ||
804 | if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, | |
805 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
806 | return 0; | |
807 | ||
808 | *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
809 | ||
810 | return 1; | |
811 | } | |
812 | ||
813 | #endif /* GET_LONGJMP_TARGET */ | |
fc338970 | 814 | \f |
c906108c | 815 | |
22f8ba57 | 816 | CORE_ADDR |
ea7c478f | 817 | i386_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
22f8ba57 MK |
818 | int struct_return, CORE_ADDR struct_addr) |
819 | { | |
820 | sp = default_push_arguments (nargs, args, sp, struct_return, struct_addr); | |
821 | ||
822 | if (struct_return) | |
823 | { | |
824 | char buf[4]; | |
825 | ||
826 | sp -= 4; | |
827 | store_address (buf, 4, struct_addr); | |
828 | write_memory (sp, buf, 4); | |
829 | } | |
830 | ||
831 | return sp; | |
832 | } | |
833 | ||
834 | void | |
835 | i386_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) | |
836 | { | |
837 | /* Do nothing. Everything was already done by i386_push_arguments. */ | |
838 | } | |
839 | ||
1a309862 MK |
840 | /* These registers are used for returning integers (and on some |
841 | targets also for returning `struct' and `union' values when their | |
ef9dff19 | 842 | size and alignment match an integer type). */ |
1a309862 MK |
843 | #define LOW_RETURN_REGNUM 0 /* %eax */ |
844 | #define HIGH_RETURN_REGNUM 2 /* %edx */ | |
845 | ||
846 | /* Extract from an array REGBUF containing the (raw) register state, a | |
847 | function return value of TYPE, and copy that, in virtual format, | |
848 | into VALBUF. */ | |
849 | ||
c906108c | 850 | void |
1a309862 | 851 | i386_extract_return_value (struct type *type, char *regbuf, char *valbuf) |
c906108c | 852 | { |
1a309862 MK |
853 | int len = TYPE_LENGTH (type); |
854 | ||
1e8d0a7b MK |
855 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
856 | && TYPE_NFIELDS (type) == 1) | |
3df1b9b4 MK |
857 | { |
858 | i386_extract_return_value (TYPE_FIELD_TYPE (type, 0), regbuf, valbuf); | |
859 | return; | |
860 | } | |
1e8d0a7b MK |
861 | |
862 | if (TYPE_CODE (type) == TYPE_CODE_FLT) | |
c906108c | 863 | { |
1a309862 MK |
864 | if (NUM_FREGS == 0) |
865 | { | |
866 | warning ("Cannot find floating-point return value."); | |
867 | memset (valbuf, 0, len); | |
ef9dff19 | 868 | return; |
1a309862 MK |
869 | } |
870 | ||
635b0cc1 | 871 | /* Floating-point return values can be found in %st(0). */ |
1a309862 MK |
872 | if (len == TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT |
873 | && TARGET_LONG_DOUBLE_FORMAT == &floatformat_i387_ext) | |
874 | { | |
875 | /* Copy straight over, but take care of the padding. */ | |
876 | memcpy (valbuf, ®buf[REGISTER_BYTE (FP0_REGNUM)], | |
877 | FPU_REG_RAW_SIZE); | |
878 | memset (valbuf + FPU_REG_RAW_SIZE, 0, len - FPU_REG_RAW_SIZE); | |
879 | } | |
880 | else | |
881 | { | |
882 | /* Convert the extended floating-point number found in | |
883 | %st(0) to the desired type. This is probably not exactly | |
884 | how it would happen on the target itself, but it is the | |
885 | best we can do. */ | |
886 | DOUBLEST val; | |
887 | floatformat_to_doublest (&floatformat_i387_ext, | |
888 | ®buf[REGISTER_BYTE (FP0_REGNUM)], &val); | |
889 | store_floating (valbuf, TYPE_LENGTH (type), val); | |
890 | } | |
c906108c SS |
891 | } |
892 | else | |
c5aa993b | 893 | { |
d4f3574e SS |
894 | int low_size = REGISTER_RAW_SIZE (LOW_RETURN_REGNUM); |
895 | int high_size = REGISTER_RAW_SIZE (HIGH_RETURN_REGNUM); | |
896 | ||
897 | if (len <= low_size) | |
1a309862 | 898 | memcpy (valbuf, ®buf[REGISTER_BYTE (LOW_RETURN_REGNUM)], len); |
d4f3574e SS |
899 | else if (len <= (low_size + high_size)) |
900 | { | |
901 | memcpy (valbuf, | |
1a309862 | 902 | ®buf[REGISTER_BYTE (LOW_RETURN_REGNUM)], low_size); |
d4f3574e | 903 | memcpy (valbuf + low_size, |
1a309862 | 904 | ®buf[REGISTER_BYTE (HIGH_RETURN_REGNUM)], len - low_size); |
d4f3574e SS |
905 | } |
906 | else | |
8e65ff28 AC |
907 | internal_error (__FILE__, __LINE__, |
908 | "Cannot extract return value of %d bytes long.", len); | |
c906108c SS |
909 | } |
910 | } | |
911 | ||
ef9dff19 MK |
912 | /* Write into the appropriate registers a function return value stored |
913 | in VALBUF of type TYPE, given in virtual format. */ | |
914 | ||
915 | void | |
916 | i386_store_return_value (struct type *type, char *valbuf) | |
917 | { | |
918 | int len = TYPE_LENGTH (type); | |
919 | ||
1e8d0a7b MK |
920 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
921 | && TYPE_NFIELDS (type) == 1) | |
3df1b9b4 MK |
922 | { |
923 | i386_store_return_value (TYPE_FIELD_TYPE (type, 0), valbuf); | |
924 | return; | |
925 | } | |
1e8d0a7b MK |
926 | |
927 | if (TYPE_CODE (type) == TYPE_CODE_FLT) | |
ef9dff19 | 928 | { |
ccb945b8 MK |
929 | unsigned int fstat; |
930 | ||
ef9dff19 MK |
931 | if (NUM_FREGS == 0) |
932 | { | |
933 | warning ("Cannot set floating-point return value."); | |
934 | return; | |
935 | } | |
936 | ||
635b0cc1 MK |
937 | /* Returning floating-point values is a bit tricky. Apart from |
938 | storing the return value in %st(0), we have to simulate the | |
939 | state of the FPU at function return point. */ | |
940 | ||
ef9dff19 MK |
941 | if (len == TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT |
942 | && TARGET_LONG_DOUBLE_FORMAT == &floatformat_i387_ext) | |
943 | { | |
944 | /* Copy straight over. */ | |
945 | write_register_bytes (REGISTER_BYTE (FP0_REGNUM), valbuf, | |
946 | FPU_REG_RAW_SIZE); | |
947 | } | |
948 | else | |
949 | { | |
950 | char buf[FPU_REG_RAW_SIZE]; | |
951 | DOUBLEST val; | |
952 | ||
953 | /* Convert the value found in VALBUF to the extended | |
635b0cc1 | 954 | floating-point format used by the FPU. This is probably |
ef9dff19 MK |
955 | not exactly how it would happen on the target itself, but |
956 | it is the best we can do. */ | |
957 | val = extract_floating (valbuf, TYPE_LENGTH (type)); | |
958 | floatformat_from_doublest (&floatformat_i387_ext, &val, buf); | |
959 | write_register_bytes (REGISTER_BYTE (FP0_REGNUM), buf, | |
960 | FPU_REG_RAW_SIZE); | |
961 | } | |
ccb945b8 | 962 | |
635b0cc1 MK |
963 | /* Set the top of the floating-point register stack to 7. The |
964 | actual value doesn't really matter, but 7 is what a normal | |
965 | function return would end up with if the program started out | |
966 | with a freshly initialized FPU. */ | |
ccb945b8 MK |
967 | fstat = read_register (FSTAT_REGNUM); |
968 | fstat |= (7 << 11); | |
969 | write_register (FSTAT_REGNUM, fstat); | |
970 | ||
635b0cc1 MK |
971 | /* Mark %st(1) through %st(7) as empty. Since we set the top of |
972 | the floating-point register stack to 7, the appropriate value | |
973 | for the tag word is 0x3fff. */ | |
ccb945b8 | 974 | write_register (FTAG_REGNUM, 0x3fff); |
ef9dff19 MK |
975 | } |
976 | else | |
977 | { | |
978 | int low_size = REGISTER_RAW_SIZE (LOW_RETURN_REGNUM); | |
979 | int high_size = REGISTER_RAW_SIZE (HIGH_RETURN_REGNUM); | |
980 | ||
981 | if (len <= low_size) | |
982 | write_register_bytes (REGISTER_BYTE (LOW_RETURN_REGNUM), valbuf, len); | |
983 | else if (len <= (low_size + high_size)) | |
984 | { | |
985 | write_register_bytes (REGISTER_BYTE (LOW_RETURN_REGNUM), | |
986 | valbuf, low_size); | |
987 | write_register_bytes (REGISTER_BYTE (HIGH_RETURN_REGNUM), | |
988 | valbuf + low_size, len - low_size); | |
989 | } | |
990 | else | |
8e65ff28 AC |
991 | internal_error (__FILE__, __LINE__, |
992 | "Cannot store return value of %d bytes long.", len); | |
ef9dff19 MK |
993 | } |
994 | } | |
f7af9647 MK |
995 | |
996 | /* Extract from an array REGBUF containing the (raw) register state | |
997 | the address in which a function should return its structure value, | |
998 | as a CORE_ADDR. */ | |
999 | ||
1000 | CORE_ADDR | |
1001 | i386_extract_struct_value_address (char *regbuf) | |
1002 | { | |
1003 | return extract_address (®buf[REGISTER_BYTE (LOW_RETURN_REGNUM)], | |
1004 | REGISTER_RAW_SIZE (LOW_RETURN_REGNUM)); | |
1005 | } | |
fc338970 | 1006 | \f |
ef9dff19 | 1007 | |
d7a0d72c MK |
1008 | /* Return the GDB type object for the "standard" data type of data in |
1009 | register REGNUM. Perhaps %esi and %edi should go here, but | |
1010 | potentially they could be used for things other than address. */ | |
1011 | ||
1012 | struct type * | |
1013 | i386_register_virtual_type (int regnum) | |
1014 | { | |
1015 | if (regnum == PC_REGNUM || regnum == FP_REGNUM || regnum == SP_REGNUM) | |
1016 | return lookup_pointer_type (builtin_type_void); | |
1017 | ||
1018 | if (IS_FP_REGNUM (regnum)) | |
1019 | return builtin_type_long_double; | |
1020 | ||
1021 | if (IS_SSE_REGNUM (regnum)) | |
1022 | return builtin_type_v4sf; | |
1023 | ||
1024 | return builtin_type_int; | |
1025 | } | |
1026 | ||
1027 | /* Return true iff register REGNUM's virtual format is different from | |
1028 | its raw format. Note that this definition assumes that the host | |
1029 | supports IEEE 32-bit floats, since it doesn't say that SSE | |
1030 | registers need conversion. Even if we can't find a counterexample, | |
1031 | this is still sloppy. */ | |
1032 | ||
1033 | int | |
1034 | i386_register_convertible (int regnum) | |
1035 | { | |
1036 | return IS_FP_REGNUM (regnum); | |
1037 | } | |
1038 | ||
ac27f131 | 1039 | /* Convert data from raw format for register REGNUM in buffer FROM to |
3d261580 | 1040 | virtual format with type TYPE in buffer TO. */ |
ac27f131 MK |
1041 | |
1042 | void | |
1043 | i386_register_convert_to_virtual (int regnum, struct type *type, | |
1044 | char *from, char *to) | |
1045 | { | |
3d261580 MK |
1046 | char buf[12]; |
1047 | DOUBLEST d; | |
1048 | ||
1049 | /* We only support floating-point values. */ | |
8d7f6b4a MK |
1050 | if (TYPE_CODE (type) != TYPE_CODE_FLT) |
1051 | { | |
1052 | warning ("Cannot convert floating-point register value " | |
1053 | "to non-floating-point type."); | |
1054 | memset (to, 0, TYPE_LENGTH (type)); | |
1055 | return; | |
1056 | } | |
3d261580 MK |
1057 | |
1058 | /* First add the necessary padding. */ | |
1059 | memcpy (buf, from, FPU_REG_RAW_SIZE); | |
1060 | memset (buf + FPU_REG_RAW_SIZE, 0, sizeof buf - FPU_REG_RAW_SIZE); | |
1061 | ||
1062 | /* Convert to TYPE. This should be a no-op, if TYPE is equivalent | |
1063 | to the extended floating-point format used by the FPU. */ | |
1064 | d = extract_floating (buf, sizeof buf); | |
1065 | store_floating (to, TYPE_LENGTH (type), d); | |
ac27f131 MK |
1066 | } |
1067 | ||
1068 | /* Convert data from virtual format with type TYPE in buffer FROM to | |
3d261580 | 1069 | raw format for register REGNUM in buffer TO. */ |
ac27f131 MK |
1070 | |
1071 | void | |
1072 | i386_register_convert_to_raw (struct type *type, int regnum, | |
1073 | char *from, char *to) | |
1074 | { | |
3d261580 MK |
1075 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_FLT |
1076 | && TYPE_LENGTH (type) == 12); | |
1077 | ||
1078 | /* Simply omit the two unused bytes. */ | |
ac27f131 MK |
1079 | memcpy (to, from, FPU_REG_RAW_SIZE); |
1080 | } | |
ac27f131 | 1081 | \f |
fc338970 | 1082 | |
c906108c | 1083 | #ifdef I386V4_SIGTRAMP_SAVED_PC |
fc338970 MK |
1084 | /* Get saved user PC for sigtramp from the pushed ucontext on the |
1085 | stack for all three variants of SVR4 sigtramps. */ | |
c906108c SS |
1086 | |
1087 | CORE_ADDR | |
fba45db2 | 1088 | i386v4_sigtramp_saved_pc (struct frame_info *frame) |
c906108c SS |
1089 | { |
1090 | CORE_ADDR saved_pc_offset = 4; | |
1091 | char *name = NULL; | |
1092 | ||
1093 | find_pc_partial_function (frame->pc, &name, NULL, NULL); | |
1094 | if (name) | |
1095 | { | |
1096 | if (STREQ (name, "_sigreturn")) | |
1097 | saved_pc_offset = 132 + 14 * 4; | |
1098 | else if (STREQ (name, "_sigacthandler")) | |
1099 | saved_pc_offset = 80 + 14 * 4; | |
1100 | else if (STREQ (name, "sigvechandler")) | |
1101 | saved_pc_offset = 120 + 14 * 4; | |
1102 | } | |
1103 | ||
1104 | if (frame->next) | |
1105 | return read_memory_integer (frame->next->frame + saved_pc_offset, 4); | |
1106 | return read_memory_integer (read_register (SP_REGNUM) + saved_pc_offset, 4); | |
1107 | } | |
1108 | #endif /* I386V4_SIGTRAMP_SAVED_PC */ | |
fc338970 | 1109 | \f |
a0b3c4fd | 1110 | |
c906108c | 1111 | #ifdef STATIC_TRANSFORM_NAME |
fc338970 MK |
1112 | /* SunPRO encodes the static variables. This is not related to C++ |
1113 | mangling, it is done for C too. */ | |
c906108c SS |
1114 | |
1115 | char * | |
fba45db2 | 1116 | sunpro_static_transform_name (char *name) |
c906108c SS |
1117 | { |
1118 | char *p; | |
1119 | if (IS_STATIC_TRANSFORM_NAME (name)) | |
1120 | { | |
fc338970 MK |
1121 | /* For file-local statics there will be a period, a bunch of |
1122 | junk (the contents of which match a string given in the | |
c5aa993b JM |
1123 | N_OPT), a period and the name. For function-local statics |
1124 | there will be a bunch of junk (which seems to change the | |
1125 | second character from 'A' to 'B'), a period, the name of the | |
1126 | function, and the name. So just skip everything before the | |
1127 | last period. */ | |
c906108c SS |
1128 | p = strrchr (name, '.'); |
1129 | if (p != NULL) | |
1130 | name = p + 1; | |
1131 | } | |
1132 | return name; | |
1133 | } | |
1134 | #endif /* STATIC_TRANSFORM_NAME */ | |
fc338970 | 1135 | \f |
c906108c | 1136 | |
fc338970 | 1137 | /* Stuff for WIN32 PE style DLL's but is pretty generic really. */ |
c906108c SS |
1138 | |
1139 | CORE_ADDR | |
fba45db2 | 1140 | skip_trampoline_code (CORE_ADDR pc, char *name) |
c906108c | 1141 | { |
fc338970 | 1142 | if (pc && read_memory_unsigned_integer (pc, 2) == 0x25ff) /* jmp *(dest) */ |
c906108c | 1143 | { |
c5aa993b | 1144 | unsigned long indirect = read_memory_unsigned_integer (pc + 2, 4); |
c906108c | 1145 | struct minimal_symbol *indsym = |
fc338970 | 1146 | indirect ? lookup_minimal_symbol_by_pc (indirect) : 0; |
c5aa993b | 1147 | char *symname = indsym ? SYMBOL_NAME (indsym) : 0; |
c906108c | 1148 | |
c5aa993b | 1149 | if (symname) |
c906108c | 1150 | { |
c5aa993b JM |
1151 | if (strncmp (symname, "__imp_", 6) == 0 |
1152 | || strncmp (symname, "_imp_", 5) == 0) | |
c906108c SS |
1153 | return name ? 1 : read_memory_unsigned_integer (indirect, 4); |
1154 | } | |
1155 | } | |
fc338970 | 1156 | return 0; /* Not a trampoline. */ |
c906108c | 1157 | } |
fc338970 MK |
1158 | \f |
1159 | ||
1160 | /* We have two flavours of disassembly. The machinery on this page | |
1161 | deals with switching between those. */ | |
c906108c SS |
1162 | |
1163 | static int | |
fba45db2 | 1164 | gdb_print_insn_i386 (bfd_vma memaddr, disassemble_info *info) |
c906108c SS |
1165 | { |
1166 | if (disassembly_flavor == att_flavor) | |
1167 | return print_insn_i386_att (memaddr, info); | |
1168 | else if (disassembly_flavor == intel_flavor) | |
1169 | return print_insn_i386_intel (memaddr, info); | |
fc338970 MK |
1170 | /* Never reached -- disassembly_flavour is always either att_flavor |
1171 | or intel_flavor. */ | |
e1e9e218 | 1172 | internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
7a292a7a SS |
1173 | } |
1174 | ||
fc338970 MK |
1175 | /* If the disassembly mode is intel, we have to also switch the bfd |
1176 | mach_type. This function is run in the set disassembly_flavor | |
7a292a7a SS |
1177 | command, and does that. */ |
1178 | ||
1179 | static void | |
fba45db2 KB |
1180 | set_disassembly_flavor_sfunc (char *args, int from_tty, |
1181 | struct cmd_list_element *c) | |
7a292a7a SS |
1182 | { |
1183 | set_disassembly_flavor (); | |
7a292a7a SS |
1184 | } |
1185 | ||
1186 | static void | |
fba45db2 | 1187 | set_disassembly_flavor (void) |
7a292a7a SS |
1188 | { |
1189 | if (disassembly_flavor == att_flavor) | |
1190 | set_architecture_from_arch_mach (bfd_arch_i386, bfd_mach_i386_i386); | |
1191 | else if (disassembly_flavor == intel_flavor) | |
fc338970 MK |
1192 | set_architecture_from_arch_mach (bfd_arch_i386, |
1193 | bfd_mach_i386_i386_intel_syntax); | |
c906108c | 1194 | } |
fc338970 | 1195 | \f |
2acceee2 | 1196 | |
28e9e0f0 MK |
1197 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1198 | void _initialize_i386_tdep (void); | |
1199 | ||
c906108c | 1200 | void |
fba45db2 | 1201 | _initialize_i386_tdep (void) |
c906108c | 1202 | { |
917317f4 JM |
1203 | /* Initialize the table saying where each register starts in the |
1204 | register file. */ | |
1205 | { | |
1206 | int i, offset; | |
1207 | ||
1208 | offset = 0; | |
1209 | for (i = 0; i < MAX_NUM_REGS; i++) | |
1210 | { | |
1211 | i386_register_byte[i] = offset; | |
1212 | offset += i386_register_raw_size[i]; | |
1213 | } | |
1214 | } | |
1215 | ||
1216 | /* Initialize the table of virtual register sizes. */ | |
1217 | { | |
1218 | int i; | |
1219 | ||
1220 | for (i = 0; i < MAX_NUM_REGS; i++) | |
1221 | i386_register_virtual_size[i] = TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (i)); | |
1222 | } | |
c5aa993b | 1223 | |
c906108c SS |
1224 | tm_print_insn = gdb_print_insn_i386; |
1225 | tm_print_insn_info.mach = bfd_lookup_arch (bfd_arch_i386, 0)->mach; | |
1226 | ||
fc338970 | 1227 | /* Add the variable that controls the disassembly flavor. */ |
917317f4 JM |
1228 | { |
1229 | struct cmd_list_element *new_cmd; | |
7a292a7a | 1230 | |
917317f4 JM |
1231 | new_cmd = add_set_enum_cmd ("disassembly-flavor", no_class, |
1232 | valid_flavors, | |
1ed2a135 | 1233 | &disassembly_flavor, |
fc338970 MK |
1234 | "\ |
1235 | Set the disassembly flavor, the valid values are \"att\" and \"intel\", \ | |
c906108c | 1236 | and the default value is \"att\".", |
917317f4 JM |
1237 | &setlist); |
1238 | new_cmd->function.sfunc = set_disassembly_flavor_sfunc; | |
1239 | add_show_from_set (new_cmd, &showlist); | |
1240 | } | |
c5aa993b | 1241 | |
7a292a7a | 1242 | /* Finally, initialize the disassembly flavor to the default given |
fc338970 | 1243 | in the disassembly_flavor variable. */ |
7a292a7a | 1244 | set_disassembly_flavor (); |
c906108c | 1245 | } |