Commit | Line | Data |
---|---|---|
c906108c | 1 | /* Intel 386 target-dependent stuff. |
349c5d5f | 2 | |
197e01b6 | 3 | Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, |
5ae96ec1 MK |
4 | 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 |
5 | Free Software Foundation, Inc. | |
c906108c | 6 | |
c5aa993b | 7 | This file is part of GDB. |
c906108c | 8 | |
c5aa993b JM |
9 | This program is free software; you can redistribute it and/or modify |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2 of the License, or | |
12 | (at your option) any later version. | |
c906108c | 13 | |
c5aa993b JM |
14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
c906108c | 18 | |
c5aa993b JM |
19 | You should have received a copy of the GNU General Public License |
20 | along with this program; if not, write to the Free Software | |
197e01b6 EZ |
21 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
22 | Boston, MA 02110-1301, USA. */ | |
c906108c SS |
23 | |
24 | #include "defs.h" | |
acd5c798 MK |
25 | #include "arch-utils.h" |
26 | #include "command.h" | |
27 | #include "dummy-frame.h" | |
6405b0a6 | 28 | #include "dwarf2-frame.h" |
acd5c798 MK |
29 | #include "doublest.h" |
30 | #include "floatformat.h" | |
c906108c | 31 | #include "frame.h" |
acd5c798 MK |
32 | #include "frame-base.h" |
33 | #include "frame-unwind.h" | |
c906108c | 34 | #include "inferior.h" |
acd5c798 | 35 | #include "gdbcmd.h" |
c906108c | 36 | #include "gdbcore.h" |
dfe01d39 | 37 | #include "objfiles.h" |
acd5c798 MK |
38 | #include "osabi.h" |
39 | #include "regcache.h" | |
40 | #include "reggroups.h" | |
473f17b0 | 41 | #include "regset.h" |
c0d1d883 | 42 | #include "symfile.h" |
c906108c | 43 | #include "symtab.h" |
acd5c798 | 44 | #include "target.h" |
fd0407d6 | 45 | #include "value.h" |
a89aa300 | 46 | #include "dis-asm.h" |
acd5c798 | 47 | |
3d261580 | 48 | #include "gdb_assert.h" |
acd5c798 | 49 | #include "gdb_string.h" |
3d261580 | 50 | |
d2a7c97a | 51 | #include "i386-tdep.h" |
61113f8b | 52 | #include "i387-tdep.h" |
d2a7c97a | 53 | |
c4fc7f1b | 54 | /* Register names. */ |
c40e1eab | 55 | |
fc633446 MK |
56 | static char *i386_register_names[] = |
57 | { | |
58 | "eax", "ecx", "edx", "ebx", | |
59 | "esp", "ebp", "esi", "edi", | |
60 | "eip", "eflags", "cs", "ss", | |
61 | "ds", "es", "fs", "gs", | |
62 | "st0", "st1", "st2", "st3", | |
63 | "st4", "st5", "st6", "st7", | |
64 | "fctrl", "fstat", "ftag", "fiseg", | |
65 | "fioff", "foseg", "fooff", "fop", | |
66 | "xmm0", "xmm1", "xmm2", "xmm3", | |
67 | "xmm4", "xmm5", "xmm6", "xmm7", | |
68 | "mxcsr" | |
69 | }; | |
70 | ||
1cb97e17 | 71 | static const int i386_num_register_names = ARRAY_SIZE (i386_register_names); |
c40e1eab | 72 | |
c4fc7f1b | 73 | /* Register names for MMX pseudo-registers. */ |
28fc6740 AC |
74 | |
75 | static char *i386_mmx_names[] = | |
76 | { | |
77 | "mm0", "mm1", "mm2", "mm3", | |
78 | "mm4", "mm5", "mm6", "mm7" | |
79 | }; | |
c40e1eab | 80 | |
1cb97e17 | 81 | static const int i386_num_mmx_regs = ARRAY_SIZE (i386_mmx_names); |
c40e1eab | 82 | |
28fc6740 | 83 | static int |
5716833c | 84 | i386_mmx_regnum_p (struct gdbarch *gdbarch, int regnum) |
28fc6740 | 85 | { |
5716833c MK |
86 | int mm0_regnum = gdbarch_tdep (gdbarch)->mm0_regnum; |
87 | ||
88 | if (mm0_regnum < 0) | |
89 | return 0; | |
90 | ||
91 | return (regnum >= mm0_regnum && regnum < mm0_regnum + i386_num_mmx_regs); | |
28fc6740 AC |
92 | } |
93 | ||
5716833c | 94 | /* SSE register? */ |
23a34459 | 95 | |
5716833c MK |
96 | static int |
97 | i386_sse_regnum_p (struct gdbarch *gdbarch, int regnum) | |
23a34459 | 98 | { |
5716833c MK |
99 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
100 | ||
101 | #define I387_ST0_REGNUM tdep->st0_regnum | |
102 | #define I387_NUM_XMM_REGS tdep->num_xmm_regs | |
103 | ||
104 | if (I387_NUM_XMM_REGS == 0) | |
105 | return 0; | |
106 | ||
107 | return (I387_XMM0_REGNUM <= regnum && regnum < I387_MXCSR_REGNUM); | |
108 | ||
109 | #undef I387_ST0_REGNUM | |
110 | #undef I387_NUM_XMM_REGS | |
23a34459 AC |
111 | } |
112 | ||
5716833c MK |
113 | static int |
114 | i386_mxcsr_regnum_p (struct gdbarch *gdbarch, int regnum) | |
23a34459 | 115 | { |
5716833c MK |
116 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
117 | ||
118 | #define I387_ST0_REGNUM tdep->st0_regnum | |
119 | #define I387_NUM_XMM_REGS tdep->num_xmm_regs | |
120 | ||
121 | if (I387_NUM_XMM_REGS == 0) | |
122 | return 0; | |
123 | ||
124 | return (regnum == I387_MXCSR_REGNUM); | |
125 | ||
126 | #undef I387_ST0_REGNUM | |
127 | #undef I387_NUM_XMM_REGS | |
23a34459 AC |
128 | } |
129 | ||
5716833c MK |
130 | #define I387_ST0_REGNUM (gdbarch_tdep (current_gdbarch)->st0_regnum) |
131 | #define I387_MM0_REGNUM (gdbarch_tdep (current_gdbarch)->mm0_regnum) | |
132 | #define I387_NUM_XMM_REGS (gdbarch_tdep (current_gdbarch)->num_xmm_regs) | |
133 | ||
134 | /* FP register? */ | |
23a34459 AC |
135 | |
136 | int | |
5716833c | 137 | i386_fp_regnum_p (int regnum) |
23a34459 | 138 | { |
5716833c MK |
139 | if (I387_ST0_REGNUM < 0) |
140 | return 0; | |
141 | ||
142 | return (I387_ST0_REGNUM <= regnum && regnum < I387_FCTRL_REGNUM); | |
23a34459 AC |
143 | } |
144 | ||
145 | int | |
5716833c | 146 | i386_fpc_regnum_p (int regnum) |
23a34459 | 147 | { |
5716833c MK |
148 | if (I387_ST0_REGNUM < 0) |
149 | return 0; | |
150 | ||
151 | return (I387_FCTRL_REGNUM <= regnum && regnum < I387_XMM0_REGNUM); | |
23a34459 AC |
152 | } |
153 | ||
30b0e2d8 | 154 | /* Return the name of register REGNUM. */ |
fc633446 | 155 | |
fa88f677 | 156 | const char * |
30b0e2d8 | 157 | i386_register_name (int regnum) |
fc633446 | 158 | { |
30b0e2d8 MK |
159 | if (i386_mmx_regnum_p (current_gdbarch, regnum)) |
160 | return i386_mmx_names[regnum - I387_MM0_REGNUM]; | |
fc633446 | 161 | |
30b0e2d8 MK |
162 | if (regnum >= 0 && regnum < i386_num_register_names) |
163 | return i386_register_names[regnum]; | |
70913449 | 164 | |
c40e1eab | 165 | return NULL; |
fc633446 MK |
166 | } |
167 | ||
c4fc7f1b | 168 | /* Convert a dbx register number REG to the appropriate register |
85540d8c MK |
169 | number used by GDB. */ |
170 | ||
8201327c | 171 | static int |
c4fc7f1b | 172 | i386_dbx_reg_to_regnum (int reg) |
85540d8c | 173 | { |
c4fc7f1b MK |
174 | /* This implements what GCC calls the "default" register map |
175 | (dbx_register_map[]). */ | |
176 | ||
85540d8c MK |
177 | if (reg >= 0 && reg <= 7) |
178 | { | |
9872ad24 JB |
179 | /* General-purpose registers. The debug info calls %ebp |
180 | register 4, and %esp register 5. */ | |
181 | if (reg == 4) | |
182 | return 5; | |
183 | else if (reg == 5) | |
184 | return 4; | |
185 | else return reg; | |
85540d8c MK |
186 | } |
187 | else if (reg >= 12 && reg <= 19) | |
188 | { | |
189 | /* Floating-point registers. */ | |
5716833c | 190 | return reg - 12 + I387_ST0_REGNUM; |
85540d8c MK |
191 | } |
192 | else if (reg >= 21 && reg <= 28) | |
193 | { | |
194 | /* SSE registers. */ | |
5716833c | 195 | return reg - 21 + I387_XMM0_REGNUM; |
85540d8c MK |
196 | } |
197 | else if (reg >= 29 && reg <= 36) | |
198 | { | |
199 | /* MMX registers. */ | |
5716833c | 200 | return reg - 29 + I387_MM0_REGNUM; |
85540d8c MK |
201 | } |
202 | ||
203 | /* This will hopefully provoke a warning. */ | |
204 | return NUM_REGS + NUM_PSEUDO_REGS; | |
205 | } | |
206 | ||
c4fc7f1b MK |
207 | /* Convert SVR4 register number REG to the appropriate register number |
208 | used by GDB. */ | |
85540d8c | 209 | |
8201327c | 210 | static int |
c4fc7f1b | 211 | i386_svr4_reg_to_regnum (int reg) |
85540d8c | 212 | { |
c4fc7f1b MK |
213 | /* This implements the GCC register map that tries to be compatible |
214 | with the SVR4 C compiler for DWARF (svr4_dbx_register_map[]). */ | |
215 | ||
216 | /* The SVR4 register numbering includes %eip and %eflags, and | |
85540d8c MK |
217 | numbers the floating point registers differently. */ |
218 | if (reg >= 0 && reg <= 9) | |
219 | { | |
acd5c798 | 220 | /* General-purpose registers. */ |
85540d8c MK |
221 | return reg; |
222 | } | |
223 | else if (reg >= 11 && reg <= 18) | |
224 | { | |
225 | /* Floating-point registers. */ | |
5716833c | 226 | return reg - 11 + I387_ST0_REGNUM; |
85540d8c | 227 | } |
c6f4c129 | 228 | else if (reg >= 21 && reg <= 36) |
85540d8c | 229 | { |
c4fc7f1b MK |
230 | /* The SSE and MMX registers have the same numbers as with dbx. */ |
231 | return i386_dbx_reg_to_regnum (reg); | |
85540d8c MK |
232 | } |
233 | ||
c6f4c129 JB |
234 | switch (reg) |
235 | { | |
236 | case 37: return I387_FCTRL_REGNUM; | |
237 | case 38: return I387_FSTAT_REGNUM; | |
238 | case 39: return I387_MXCSR_REGNUM; | |
239 | case 40: return I386_ES_REGNUM; | |
240 | case 41: return I386_CS_REGNUM; | |
241 | case 42: return I386_SS_REGNUM; | |
242 | case 43: return I386_DS_REGNUM; | |
243 | case 44: return I386_FS_REGNUM; | |
244 | case 45: return I386_GS_REGNUM; | |
245 | } | |
246 | ||
85540d8c MK |
247 | /* This will hopefully provoke a warning. */ |
248 | return NUM_REGS + NUM_PSEUDO_REGS; | |
249 | } | |
5716833c MK |
250 | |
251 | #undef I387_ST0_REGNUM | |
252 | #undef I387_MM0_REGNUM | |
253 | #undef I387_NUM_XMM_REGS | |
fc338970 | 254 | \f |
917317f4 | 255 | |
fc338970 MK |
256 | /* This is the variable that is set with "set disassembly-flavor", and |
257 | its legitimate values. */ | |
53904c9e AC |
258 | static const char att_flavor[] = "att"; |
259 | static const char intel_flavor[] = "intel"; | |
260 | static const char *valid_flavors[] = | |
c5aa993b | 261 | { |
c906108c SS |
262 | att_flavor, |
263 | intel_flavor, | |
264 | NULL | |
265 | }; | |
53904c9e | 266 | static const char *disassembly_flavor = att_flavor; |
acd5c798 | 267 | \f |
c906108c | 268 | |
acd5c798 MK |
269 | /* Use the program counter to determine the contents and size of a |
270 | breakpoint instruction. Return a pointer to a string of bytes that | |
271 | encode a breakpoint instruction, store the length of the string in | |
272 | *LEN and optionally adjust *PC to point to the correct memory | |
273 | location for inserting the breakpoint. | |
c906108c | 274 | |
acd5c798 MK |
275 | On the i386 we have a single breakpoint that fits in a single byte |
276 | and can be inserted anywhere. | |
c906108c | 277 | |
acd5c798 | 278 | This function is 64-bit safe. */ |
63c0089f MK |
279 | |
280 | static const gdb_byte * | |
acd5c798 | 281 | i386_breakpoint_from_pc (CORE_ADDR *pc, int *len) |
c906108c | 282 | { |
63c0089f MK |
283 | static gdb_byte break_insn[] = { 0xcc }; /* int 3 */ |
284 | ||
acd5c798 MK |
285 | *len = sizeof (break_insn); |
286 | return break_insn; | |
c906108c | 287 | } |
fc338970 | 288 | \f |
acd5c798 MK |
289 | #ifdef I386_REGNO_TO_SYMMETRY |
290 | #error "The Sequent Symmetry is no longer supported." | |
291 | #endif | |
c906108c | 292 | |
acd5c798 MK |
293 | /* According to the System V ABI, the registers %ebp, %ebx, %edi, %esi |
294 | and %esp "belong" to the calling function. Therefore these | |
295 | registers should be saved if they're going to be modified. */ | |
c906108c | 296 | |
acd5c798 MK |
297 | /* The maximum number of saved registers. This should include all |
298 | registers mentioned above, and %eip. */ | |
a3386186 | 299 | #define I386_NUM_SAVED_REGS I386_NUM_GREGS |
acd5c798 MK |
300 | |
301 | struct i386_frame_cache | |
c906108c | 302 | { |
acd5c798 MK |
303 | /* Base address. */ |
304 | CORE_ADDR base; | |
772562f8 | 305 | LONGEST sp_offset; |
acd5c798 MK |
306 | CORE_ADDR pc; |
307 | ||
fd13a04a AC |
308 | /* Saved registers. */ |
309 | CORE_ADDR saved_regs[I386_NUM_SAVED_REGS]; | |
acd5c798 | 310 | CORE_ADDR saved_sp; |
92dd43fa | 311 | int stack_align; |
acd5c798 MK |
312 | int pc_in_eax; |
313 | ||
314 | /* Stack space reserved for local variables. */ | |
315 | long locals; | |
316 | }; | |
317 | ||
318 | /* Allocate and initialize a frame cache. */ | |
319 | ||
320 | static struct i386_frame_cache * | |
fd13a04a | 321 | i386_alloc_frame_cache (void) |
acd5c798 MK |
322 | { |
323 | struct i386_frame_cache *cache; | |
324 | int i; | |
325 | ||
326 | cache = FRAME_OBSTACK_ZALLOC (struct i386_frame_cache); | |
327 | ||
328 | /* Base address. */ | |
329 | cache->base = 0; | |
330 | cache->sp_offset = -4; | |
331 | cache->pc = 0; | |
332 | ||
fd13a04a AC |
333 | /* Saved registers. We initialize these to -1 since zero is a valid |
334 | offset (that's where %ebp is supposed to be stored). */ | |
335 | for (i = 0; i < I386_NUM_SAVED_REGS; i++) | |
336 | cache->saved_regs[i] = -1; | |
acd5c798 | 337 | cache->saved_sp = 0; |
92dd43fa | 338 | cache->stack_align = 0; |
acd5c798 MK |
339 | cache->pc_in_eax = 0; |
340 | ||
341 | /* Frameless until proven otherwise. */ | |
342 | cache->locals = -1; | |
343 | ||
344 | return cache; | |
345 | } | |
c906108c | 346 | |
acd5c798 MK |
347 | /* If the instruction at PC is a jump, return the address of its |
348 | target. Otherwise, return PC. */ | |
c906108c | 349 | |
acd5c798 MK |
350 | static CORE_ADDR |
351 | i386_follow_jump (CORE_ADDR pc) | |
352 | { | |
63c0089f | 353 | gdb_byte op; |
acd5c798 MK |
354 | long delta = 0; |
355 | int data16 = 0; | |
c906108c | 356 | |
acd5c798 MK |
357 | op = read_memory_unsigned_integer (pc, 1); |
358 | if (op == 0x66) | |
c906108c | 359 | { |
c906108c | 360 | data16 = 1; |
acd5c798 | 361 | op = read_memory_unsigned_integer (pc + 1, 1); |
c906108c SS |
362 | } |
363 | ||
acd5c798 | 364 | switch (op) |
c906108c SS |
365 | { |
366 | case 0xe9: | |
fc338970 | 367 | /* Relative jump: if data16 == 0, disp32, else disp16. */ |
c906108c SS |
368 | if (data16) |
369 | { | |
acd5c798 | 370 | delta = read_memory_integer (pc + 2, 2); |
c906108c | 371 | |
fc338970 MK |
372 | /* Include the size of the jmp instruction (including the |
373 | 0x66 prefix). */ | |
acd5c798 | 374 | delta += 4; |
c906108c SS |
375 | } |
376 | else | |
377 | { | |
acd5c798 | 378 | delta = read_memory_integer (pc + 1, 4); |
c906108c | 379 | |
acd5c798 MK |
380 | /* Include the size of the jmp instruction. */ |
381 | delta += 5; | |
c906108c SS |
382 | } |
383 | break; | |
384 | case 0xeb: | |
fc338970 | 385 | /* Relative jump, disp8 (ignore data16). */ |
acd5c798 | 386 | delta = read_memory_integer (pc + data16 + 1, 1); |
c906108c | 387 | |
acd5c798 | 388 | delta += data16 + 2; |
c906108c SS |
389 | break; |
390 | } | |
c906108c | 391 | |
acd5c798 MK |
392 | return pc + delta; |
393 | } | |
fc338970 | 394 | |
acd5c798 MK |
395 | /* Check whether PC points at a prologue for a function returning a |
396 | structure or union. If so, it updates CACHE and returns the | |
397 | address of the first instruction after the code sequence that | |
398 | removes the "hidden" argument from the stack or CURRENT_PC, | |
399 | whichever is smaller. Otherwise, return PC. */ | |
c906108c | 400 | |
acd5c798 MK |
401 | static CORE_ADDR |
402 | i386_analyze_struct_return (CORE_ADDR pc, CORE_ADDR current_pc, | |
403 | struct i386_frame_cache *cache) | |
c906108c | 404 | { |
acd5c798 MK |
405 | /* Functions that return a structure or union start with: |
406 | ||
407 | popl %eax 0x58 | |
408 | xchgl %eax, (%esp) 0x87 0x04 0x24 | |
409 | or xchgl %eax, 0(%esp) 0x87 0x44 0x24 0x00 | |
410 | ||
411 | (the System V compiler puts out the second `xchg' instruction, | |
412 | and the assembler doesn't try to optimize it, so the 'sib' form | |
413 | gets generated). This sequence is used to get the address of the | |
414 | return buffer for a function that returns a structure. */ | |
63c0089f MK |
415 | static gdb_byte proto1[3] = { 0x87, 0x04, 0x24 }; |
416 | static gdb_byte proto2[4] = { 0x87, 0x44, 0x24, 0x00 }; | |
417 | gdb_byte buf[4]; | |
418 | gdb_byte op; | |
c906108c | 419 | |
acd5c798 MK |
420 | if (current_pc <= pc) |
421 | return pc; | |
422 | ||
423 | op = read_memory_unsigned_integer (pc, 1); | |
c906108c | 424 | |
acd5c798 MK |
425 | if (op != 0x58) /* popl %eax */ |
426 | return pc; | |
c906108c | 427 | |
acd5c798 MK |
428 | read_memory (pc + 1, buf, 4); |
429 | if (memcmp (buf, proto1, 3) != 0 && memcmp (buf, proto2, 4) != 0) | |
430 | return pc; | |
c906108c | 431 | |
acd5c798 | 432 | if (current_pc == pc) |
c906108c | 433 | { |
acd5c798 MK |
434 | cache->sp_offset += 4; |
435 | return current_pc; | |
c906108c SS |
436 | } |
437 | ||
acd5c798 | 438 | if (current_pc == pc + 1) |
c906108c | 439 | { |
acd5c798 MK |
440 | cache->pc_in_eax = 1; |
441 | return current_pc; | |
442 | } | |
443 | ||
444 | if (buf[1] == proto1[1]) | |
445 | return pc + 4; | |
446 | else | |
447 | return pc + 5; | |
448 | } | |
449 | ||
450 | static CORE_ADDR | |
451 | i386_skip_probe (CORE_ADDR pc) | |
452 | { | |
453 | /* A function may start with | |
fc338970 | 454 | |
acd5c798 MK |
455 | pushl constant |
456 | call _probe | |
457 | addl $4, %esp | |
fc338970 | 458 | |
acd5c798 MK |
459 | followed by |
460 | ||
461 | pushl %ebp | |
fc338970 | 462 | |
acd5c798 | 463 | etc. */ |
63c0089f MK |
464 | gdb_byte buf[8]; |
465 | gdb_byte op; | |
fc338970 | 466 | |
acd5c798 MK |
467 | op = read_memory_unsigned_integer (pc, 1); |
468 | ||
469 | if (op == 0x68 || op == 0x6a) | |
470 | { | |
471 | int delta; | |
c906108c | 472 | |
acd5c798 MK |
473 | /* Skip past the `pushl' instruction; it has either a one-byte or a |
474 | four-byte operand, depending on the opcode. */ | |
c906108c | 475 | if (op == 0x68) |
acd5c798 | 476 | delta = 5; |
c906108c | 477 | else |
acd5c798 | 478 | delta = 2; |
c906108c | 479 | |
acd5c798 MK |
480 | /* Read the following 8 bytes, which should be `call _probe' (6 |
481 | bytes) followed by `addl $4,%esp' (2 bytes). */ | |
482 | read_memory (pc + delta, buf, sizeof (buf)); | |
c906108c | 483 | if (buf[0] == 0xe8 && buf[6] == 0xc4 && buf[7] == 0x4) |
acd5c798 | 484 | pc += delta + sizeof (buf); |
c906108c SS |
485 | } |
486 | ||
acd5c798 MK |
487 | return pc; |
488 | } | |
489 | ||
92dd43fa MK |
490 | /* GCC 4.1 and later, can put code in the prologue to realign the |
491 | stack pointer. Check whether PC points to such code, and update | |
492 | CACHE accordingly. Return the first instruction after the code | |
493 | sequence or CURRENT_PC, whichever is smaller. If we don't | |
494 | recognize the code, return PC. */ | |
495 | ||
496 | static CORE_ADDR | |
497 | i386_analyze_stack_align (CORE_ADDR pc, CORE_ADDR current_pc, | |
498 | struct i386_frame_cache *cache) | |
499 | { | |
500 | static const gdb_byte insns[10] = { | |
501 | 0x8d, 0x4c, 0x24, 0x04, /* leal 4(%esp), %ecx */ | |
502 | 0x83, 0xe4, 0xf0, /* andl $-16, %esp */ | |
503 | 0xff, 0x71, 0xfc /* pushl -4(%ecx) */ | |
504 | }; | |
505 | gdb_byte buf[10]; | |
506 | ||
507 | if (target_read_memory (pc, buf, sizeof buf) | |
508 | || memcmp (buf, insns, sizeof buf) != 0) | |
509 | return pc; | |
510 | ||
511 | if (current_pc > pc + 4) | |
512 | cache->stack_align = 1; | |
513 | ||
514 | return min (pc + 10, current_pc); | |
515 | } | |
516 | ||
37bdc87e MK |
517 | /* Maximum instruction length we need to handle. */ |
518 | #define I386_MAX_INSN_LEN 6 | |
519 | ||
520 | /* Instruction description. */ | |
521 | struct i386_insn | |
522 | { | |
523 | size_t len; | |
63c0089f MK |
524 | gdb_byte insn[I386_MAX_INSN_LEN]; |
525 | gdb_byte mask[I386_MAX_INSN_LEN]; | |
37bdc87e MK |
526 | }; |
527 | ||
528 | /* Search for the instruction at PC in the list SKIP_INSNS. Return | |
529 | the first instruction description that matches. Otherwise, return | |
530 | NULL. */ | |
531 | ||
532 | static struct i386_insn * | |
533 | i386_match_insn (CORE_ADDR pc, struct i386_insn *skip_insns) | |
534 | { | |
535 | struct i386_insn *insn; | |
63c0089f | 536 | gdb_byte op; |
37bdc87e MK |
537 | |
538 | op = read_memory_unsigned_integer (pc, 1); | |
539 | ||
540 | for (insn = skip_insns; insn->len > 0; insn++) | |
541 | { | |
542 | if ((op & insn->mask[0]) == insn->insn[0]) | |
543 | { | |
613e8135 MK |
544 | gdb_byte buf[I386_MAX_INSN_LEN - 1]; |
545 | int insn_matched = 1; | |
37bdc87e MK |
546 | size_t i; |
547 | ||
548 | gdb_assert (insn->len > 1); | |
549 | gdb_assert (insn->len <= I386_MAX_INSN_LEN); | |
550 | ||
551 | read_memory (pc + 1, buf, insn->len - 1); | |
552 | for (i = 1; i < insn->len; i++) | |
553 | { | |
554 | if ((buf[i - 1] & insn->mask[i]) != insn->insn[i]) | |
613e8135 | 555 | insn_matched = 0; |
37bdc87e | 556 | } |
613e8135 MK |
557 | |
558 | if (insn_matched) | |
559 | return insn; | |
37bdc87e MK |
560 | } |
561 | } | |
562 | ||
563 | return NULL; | |
564 | } | |
565 | ||
566 | /* Some special instructions that might be migrated by GCC into the | |
567 | part of the prologue that sets up the new stack frame. Because the | |
568 | stack frame hasn't been setup yet, no registers have been saved | |
569 | yet, and only the scratch registers %eax, %ecx and %edx can be | |
570 | touched. */ | |
571 | ||
572 | struct i386_insn i386_frame_setup_skip_insns[] = | |
573 | { | |
574 | /* Check for `movb imm8, r' and `movl imm32, r'. | |
575 | ||
576 | ??? Should we handle 16-bit operand-sizes here? */ | |
577 | ||
578 | /* `movb imm8, %al' and `movb imm8, %ah' */ | |
579 | /* `movb imm8, %cl' and `movb imm8, %ch' */ | |
580 | { 2, { 0xb0, 0x00 }, { 0xfa, 0x00 } }, | |
581 | /* `movb imm8, %dl' and `movb imm8, %dh' */ | |
582 | { 2, { 0xb2, 0x00 }, { 0xfb, 0x00 } }, | |
583 | /* `movl imm32, %eax' and `movl imm32, %ecx' */ | |
584 | { 5, { 0xb8 }, { 0xfe } }, | |
585 | /* `movl imm32, %edx' */ | |
586 | { 5, { 0xba }, { 0xff } }, | |
587 | ||
588 | /* Check for `mov imm32, r32'. Note that there is an alternative | |
589 | encoding for `mov m32, %eax'. | |
590 | ||
591 | ??? Should we handle SIB adressing here? | |
592 | ??? Should we handle 16-bit operand-sizes here? */ | |
593 | ||
594 | /* `movl m32, %eax' */ | |
595 | { 5, { 0xa1 }, { 0xff } }, | |
596 | /* `movl m32, %eax' and `mov; m32, %ecx' */ | |
597 | { 6, { 0x89, 0x05 }, {0xff, 0xf7 } }, | |
598 | /* `movl m32, %edx' */ | |
599 | { 6, { 0x89, 0x15 }, {0xff, 0xff } }, | |
600 | ||
601 | /* Check for `xorl r32, r32' and the equivalent `subl r32, r32'. | |
602 | Because of the symmetry, there are actually two ways to encode | |
603 | these instructions; opcode bytes 0x29 and 0x2b for `subl' and | |
604 | opcode bytes 0x31 and 0x33 for `xorl'. */ | |
605 | ||
606 | /* `subl %eax, %eax' */ | |
607 | { 2, { 0x29, 0xc0 }, { 0xfd, 0xff } }, | |
608 | /* `subl %ecx, %ecx' */ | |
609 | { 2, { 0x29, 0xc9 }, { 0xfd, 0xff } }, | |
610 | /* `subl %edx, %edx' */ | |
611 | { 2, { 0x29, 0xd2 }, { 0xfd, 0xff } }, | |
612 | /* `xorl %eax, %eax' */ | |
613 | { 2, { 0x31, 0xc0 }, { 0xfd, 0xff } }, | |
614 | /* `xorl %ecx, %ecx' */ | |
615 | { 2, { 0x31, 0xc9 }, { 0xfd, 0xff } }, | |
616 | /* `xorl %edx, %edx' */ | |
617 | { 2, { 0x31, 0xd2 }, { 0xfd, 0xff } }, | |
618 | { 0 } | |
619 | }; | |
620 | ||
acd5c798 MK |
621 | /* Check whether PC points at a code that sets up a new stack frame. |
622 | If so, it updates CACHE and returns the address of the first | |
37bdc87e MK |
623 | instruction after the sequence that sets up the frame or LIMIT, |
624 | whichever is smaller. If we don't recognize the code, return PC. */ | |
acd5c798 MK |
625 | |
626 | static CORE_ADDR | |
37bdc87e | 627 | i386_analyze_frame_setup (CORE_ADDR pc, CORE_ADDR limit, |
acd5c798 MK |
628 | struct i386_frame_cache *cache) |
629 | { | |
37bdc87e | 630 | struct i386_insn *insn; |
63c0089f | 631 | gdb_byte op; |
26604a34 | 632 | int skip = 0; |
acd5c798 | 633 | |
37bdc87e MK |
634 | if (limit <= pc) |
635 | return limit; | |
acd5c798 MK |
636 | |
637 | op = read_memory_unsigned_integer (pc, 1); | |
638 | ||
c906108c | 639 | if (op == 0x55) /* pushl %ebp */ |
c5aa993b | 640 | { |
acd5c798 MK |
641 | /* Take into account that we've executed the `pushl %ebp' that |
642 | starts this instruction sequence. */ | |
fd13a04a | 643 | cache->saved_regs[I386_EBP_REGNUM] = 0; |
acd5c798 | 644 | cache->sp_offset += 4; |
37bdc87e | 645 | pc++; |
acd5c798 MK |
646 | |
647 | /* If that's all, return now. */ | |
37bdc87e MK |
648 | if (limit <= pc) |
649 | return limit; | |
26604a34 | 650 | |
b4632131 | 651 | /* Check for some special instructions that might be migrated by |
37bdc87e MK |
652 | GCC into the prologue and skip them. At this point in the |
653 | prologue, code should only touch the scratch registers %eax, | |
654 | %ecx and %edx, so while the number of posibilities is sheer, | |
655 | it is limited. | |
5daa5b4e | 656 | |
26604a34 MK |
657 | Make sure we only skip these instructions if we later see the |
658 | `movl %esp, %ebp' that actually sets up the frame. */ | |
37bdc87e | 659 | while (pc + skip < limit) |
26604a34 | 660 | { |
37bdc87e MK |
661 | insn = i386_match_insn (pc + skip, i386_frame_setup_skip_insns); |
662 | if (insn == NULL) | |
663 | break; | |
b4632131 | 664 | |
37bdc87e | 665 | skip += insn->len; |
26604a34 MK |
666 | } |
667 | ||
37bdc87e MK |
668 | /* If that's all, return now. */ |
669 | if (limit <= pc + skip) | |
670 | return limit; | |
671 | ||
672 | op = read_memory_unsigned_integer (pc + skip, 1); | |
673 | ||
26604a34 | 674 | /* Check for `movl %esp, %ebp' -- can be written in two ways. */ |
acd5c798 | 675 | switch (op) |
c906108c SS |
676 | { |
677 | case 0x8b: | |
37bdc87e MK |
678 | if (read_memory_unsigned_integer (pc + skip + 1, 1) != 0xec) |
679 | return pc; | |
c906108c SS |
680 | break; |
681 | case 0x89: | |
37bdc87e MK |
682 | if (read_memory_unsigned_integer (pc + skip + 1, 1) != 0xe5) |
683 | return pc; | |
c906108c SS |
684 | break; |
685 | default: | |
37bdc87e | 686 | return pc; |
c906108c | 687 | } |
acd5c798 | 688 | |
26604a34 MK |
689 | /* OK, we actually have a frame. We just don't know how large |
690 | it is yet. Set its size to zero. We'll adjust it if | |
691 | necessary. We also now commit to skipping the special | |
692 | instructions mentioned before. */ | |
acd5c798 | 693 | cache->locals = 0; |
37bdc87e | 694 | pc += (skip + 2); |
acd5c798 MK |
695 | |
696 | /* If that's all, return now. */ | |
37bdc87e MK |
697 | if (limit <= pc) |
698 | return limit; | |
acd5c798 | 699 | |
fc338970 MK |
700 | /* Check for stack adjustment |
701 | ||
acd5c798 | 702 | subl $XXX, %esp |
fc338970 | 703 | |
fd35795f | 704 | NOTE: You can't subtract a 16-bit immediate from a 32-bit |
fc338970 | 705 | reg, so we don't have to worry about a data16 prefix. */ |
37bdc87e | 706 | op = read_memory_unsigned_integer (pc, 1); |
c906108c SS |
707 | if (op == 0x83) |
708 | { | |
fd35795f | 709 | /* `subl' with 8-bit immediate. */ |
37bdc87e | 710 | if (read_memory_unsigned_integer (pc + 1, 1) != 0xec) |
fc338970 | 711 | /* Some instruction starting with 0x83 other than `subl'. */ |
37bdc87e | 712 | return pc; |
acd5c798 | 713 | |
37bdc87e MK |
714 | /* `subl' with signed 8-bit immediate (though it wouldn't |
715 | make sense to be negative). */ | |
716 | cache->locals = read_memory_integer (pc + 2, 1); | |
717 | return pc + 3; | |
c906108c SS |
718 | } |
719 | else if (op == 0x81) | |
720 | { | |
fd35795f | 721 | /* Maybe it is `subl' with a 32-bit immediate. */ |
37bdc87e | 722 | if (read_memory_unsigned_integer (pc + 1, 1) != 0xec) |
fc338970 | 723 | /* Some instruction starting with 0x81 other than `subl'. */ |
37bdc87e | 724 | return pc; |
acd5c798 | 725 | |
fd35795f | 726 | /* It is `subl' with a 32-bit immediate. */ |
37bdc87e MK |
727 | cache->locals = read_memory_integer (pc + 2, 4); |
728 | return pc + 6; | |
c906108c SS |
729 | } |
730 | else | |
731 | { | |
acd5c798 | 732 | /* Some instruction other than `subl'. */ |
37bdc87e | 733 | return pc; |
c906108c SS |
734 | } |
735 | } | |
37bdc87e | 736 | else if (op == 0xc8) /* enter */ |
c906108c | 737 | { |
acd5c798 MK |
738 | cache->locals = read_memory_unsigned_integer (pc + 1, 2); |
739 | return pc + 4; | |
c906108c | 740 | } |
21d0e8a4 | 741 | |
acd5c798 | 742 | return pc; |
21d0e8a4 MK |
743 | } |
744 | ||
acd5c798 MK |
745 | /* Check whether PC points at code that saves registers on the stack. |
746 | If so, it updates CACHE and returns the address of the first | |
747 | instruction after the register saves or CURRENT_PC, whichever is | |
748 | smaller. Otherwise, return PC. */ | |
6bff26de MK |
749 | |
750 | static CORE_ADDR | |
acd5c798 MK |
751 | i386_analyze_register_saves (CORE_ADDR pc, CORE_ADDR current_pc, |
752 | struct i386_frame_cache *cache) | |
6bff26de | 753 | { |
99ab4326 | 754 | CORE_ADDR offset = 0; |
63c0089f | 755 | gdb_byte op; |
99ab4326 | 756 | int i; |
c0d1d883 | 757 | |
99ab4326 MK |
758 | if (cache->locals > 0) |
759 | offset -= cache->locals; | |
760 | for (i = 0; i < 8 && pc < current_pc; i++) | |
761 | { | |
762 | op = read_memory_unsigned_integer (pc, 1); | |
763 | if (op < 0x50 || op > 0x57) | |
764 | break; | |
0d17c81d | 765 | |
99ab4326 MK |
766 | offset -= 4; |
767 | cache->saved_regs[op - 0x50] = offset; | |
768 | cache->sp_offset += 4; | |
769 | pc++; | |
6bff26de MK |
770 | } |
771 | ||
acd5c798 | 772 | return pc; |
22797942 AC |
773 | } |
774 | ||
acd5c798 MK |
775 | /* Do a full analysis of the prologue at PC and update CACHE |
776 | accordingly. Bail out early if CURRENT_PC is reached. Return the | |
777 | address where the analysis stopped. | |
ed84f6c1 | 778 | |
fc338970 MK |
779 | We handle these cases: |
780 | ||
781 | The startup sequence can be at the start of the function, or the | |
782 | function can start with a branch to startup code at the end. | |
783 | ||
784 | %ebp can be set up with either the 'enter' instruction, or "pushl | |
785 | %ebp, movl %esp, %ebp" (`enter' is too slow to be useful, but was | |
786 | once used in the System V compiler). | |
787 | ||
788 | Local space is allocated just below the saved %ebp by either the | |
fd35795f MK |
789 | 'enter' instruction, or by "subl $<size>, %esp". 'enter' has a |
790 | 16-bit unsigned argument for space to allocate, and the 'addl' | |
791 | instruction could have either a signed byte, or 32-bit immediate. | |
fc338970 MK |
792 | |
793 | Next, the registers used by this function are pushed. With the | |
794 | System V compiler they will always be in the order: %edi, %esi, | |
795 | %ebx (and sometimes a harmless bug causes it to also save but not | |
796 | restore %eax); however, the code below is willing to see the pushes | |
797 | in any order, and will handle up to 8 of them. | |
798 | ||
799 | If the setup sequence is at the end of the function, then the next | |
800 | instruction will be a branch back to the start. */ | |
c906108c | 801 | |
acd5c798 MK |
802 | static CORE_ADDR |
803 | i386_analyze_prologue (CORE_ADDR pc, CORE_ADDR current_pc, | |
804 | struct i386_frame_cache *cache) | |
c906108c | 805 | { |
acd5c798 MK |
806 | pc = i386_follow_jump (pc); |
807 | pc = i386_analyze_struct_return (pc, current_pc, cache); | |
808 | pc = i386_skip_probe (pc); | |
92dd43fa | 809 | pc = i386_analyze_stack_align (pc, current_pc, cache); |
acd5c798 MK |
810 | pc = i386_analyze_frame_setup (pc, current_pc, cache); |
811 | return i386_analyze_register_saves (pc, current_pc, cache); | |
c906108c SS |
812 | } |
813 | ||
fc338970 | 814 | /* Return PC of first real instruction. */ |
c906108c | 815 | |
3a1e71e3 | 816 | static CORE_ADDR |
acd5c798 | 817 | i386_skip_prologue (CORE_ADDR start_pc) |
c906108c | 818 | { |
63c0089f | 819 | static gdb_byte pic_pat[6] = |
acd5c798 MK |
820 | { |
821 | 0xe8, 0, 0, 0, 0, /* call 0x0 */ | |
822 | 0x5b, /* popl %ebx */ | |
c5aa993b | 823 | }; |
acd5c798 MK |
824 | struct i386_frame_cache cache; |
825 | CORE_ADDR pc; | |
63c0089f | 826 | gdb_byte op; |
acd5c798 | 827 | int i; |
c5aa993b | 828 | |
acd5c798 MK |
829 | cache.locals = -1; |
830 | pc = i386_analyze_prologue (start_pc, 0xffffffff, &cache); | |
831 | if (cache.locals < 0) | |
832 | return start_pc; | |
c5aa993b | 833 | |
acd5c798 | 834 | /* Found valid frame setup. */ |
c906108c | 835 | |
fc338970 MK |
836 | /* The native cc on SVR4 in -K PIC mode inserts the following code |
837 | to get the address of the global offset table (GOT) into register | |
acd5c798 MK |
838 | %ebx: |
839 | ||
fc338970 MK |
840 | call 0x0 |
841 | popl %ebx | |
842 | movl %ebx,x(%ebp) (optional) | |
843 | addl y,%ebx | |
844 | ||
c906108c SS |
845 | This code is with the rest of the prologue (at the end of the |
846 | function), so we have to skip it to get to the first real | |
847 | instruction at the start of the function. */ | |
c5aa993b | 848 | |
c906108c SS |
849 | for (i = 0; i < 6; i++) |
850 | { | |
acd5c798 | 851 | op = read_memory_unsigned_integer (pc + i, 1); |
c5aa993b | 852 | if (pic_pat[i] != op) |
c906108c SS |
853 | break; |
854 | } | |
855 | if (i == 6) | |
856 | { | |
acd5c798 MK |
857 | int delta = 6; |
858 | ||
859 | op = read_memory_unsigned_integer (pc + delta, 1); | |
c906108c | 860 | |
c5aa993b | 861 | if (op == 0x89) /* movl %ebx, x(%ebp) */ |
c906108c | 862 | { |
acd5c798 MK |
863 | op = read_memory_unsigned_integer (pc + delta + 1, 1); |
864 | ||
fc338970 | 865 | if (op == 0x5d) /* One byte offset from %ebp. */ |
acd5c798 | 866 | delta += 3; |
fc338970 | 867 | else if (op == 0x9d) /* Four byte offset from %ebp. */ |
acd5c798 | 868 | delta += 6; |
fc338970 | 869 | else /* Unexpected instruction. */ |
acd5c798 MK |
870 | delta = 0; |
871 | ||
872 | op = read_memory_unsigned_integer (pc + delta, 1); | |
c906108c | 873 | } |
acd5c798 | 874 | |
c5aa993b | 875 | /* addl y,%ebx */ |
acd5c798 MK |
876 | if (delta > 0 && op == 0x81 |
877 | && read_memory_unsigned_integer (pc + delta + 1, 1) == 0xc3); | |
c906108c | 878 | { |
acd5c798 | 879 | pc += delta + 6; |
c906108c SS |
880 | } |
881 | } | |
c5aa993b | 882 | |
e63bbc88 MK |
883 | /* If the function starts with a branch (to startup code at the end) |
884 | the last instruction should bring us back to the first | |
885 | instruction of the real code. */ | |
886 | if (i386_follow_jump (start_pc) != start_pc) | |
887 | pc = i386_follow_jump (pc); | |
888 | ||
889 | return pc; | |
c906108c SS |
890 | } |
891 | ||
acd5c798 | 892 | /* This function is 64-bit safe. */ |
93924b6b | 893 | |
acd5c798 MK |
894 | static CORE_ADDR |
895 | i386_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
93924b6b | 896 | { |
63c0089f | 897 | gdb_byte buf[8]; |
acd5c798 MK |
898 | |
899 | frame_unwind_register (next_frame, PC_REGNUM, buf); | |
900 | return extract_typed_address (buf, builtin_type_void_func_ptr); | |
93924b6b | 901 | } |
acd5c798 | 902 | \f |
93924b6b | 903 | |
acd5c798 | 904 | /* Normal frames. */ |
c5aa993b | 905 | |
acd5c798 MK |
906 | static struct i386_frame_cache * |
907 | i386_frame_cache (struct frame_info *next_frame, void **this_cache) | |
a7769679 | 908 | { |
acd5c798 | 909 | struct i386_frame_cache *cache; |
63c0089f | 910 | gdb_byte buf[4]; |
acd5c798 MK |
911 | int i; |
912 | ||
913 | if (*this_cache) | |
914 | return *this_cache; | |
915 | ||
fd13a04a | 916 | cache = i386_alloc_frame_cache (); |
acd5c798 MK |
917 | *this_cache = cache; |
918 | ||
919 | /* In principle, for normal frames, %ebp holds the frame pointer, | |
920 | which holds the base address for the current stack frame. | |
921 | However, for functions that don't need it, the frame pointer is | |
922 | optional. For these "frameless" functions the frame pointer is | |
923 | actually the frame pointer of the calling frame. Signal | |
924 | trampolines are just a special case of a "frameless" function. | |
925 | They (usually) share their frame pointer with the frame that was | |
926 | in progress when the signal occurred. */ | |
927 | ||
928 | frame_unwind_register (next_frame, I386_EBP_REGNUM, buf); | |
929 | cache->base = extract_unsigned_integer (buf, 4); | |
930 | if (cache->base == 0) | |
931 | return cache; | |
932 | ||
933 | /* For normal frames, %eip is stored at 4(%ebp). */ | |
fd13a04a | 934 | cache->saved_regs[I386_EIP_REGNUM] = 4; |
acd5c798 MK |
935 | |
936 | cache->pc = frame_func_unwind (next_frame); | |
937 | if (cache->pc != 0) | |
938 | i386_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache); | |
939 | ||
92dd43fa MK |
940 | if (cache->stack_align) |
941 | { | |
942 | /* Saved stack pointer has been saved in %ecx. */ | |
943 | frame_unwind_register (next_frame, I386_ECX_REGNUM, buf); | |
944 | cache->saved_sp = extract_unsigned_integer(buf, 4); | |
945 | } | |
946 | ||
acd5c798 MK |
947 | if (cache->locals < 0) |
948 | { | |
949 | /* We didn't find a valid frame, which means that CACHE->base | |
950 | currently holds the frame pointer for our calling frame. If | |
951 | we're at the start of a function, or somewhere half-way its | |
952 | prologue, the function's frame probably hasn't been fully | |
953 | setup yet. Try to reconstruct the base address for the stack | |
954 | frame by looking at the stack pointer. For truly "frameless" | |
955 | functions this might work too. */ | |
956 | ||
92dd43fa MK |
957 | if (cache->stack_align) |
958 | { | |
959 | /* We're halfway aligning the stack. */ | |
960 | cache->base = ((cache->saved_sp - 4) & 0xfffffff0) - 4; | |
961 | cache->saved_regs[I386_EIP_REGNUM] = cache->saved_sp - 4; | |
962 | ||
963 | /* This will be added back below. */ | |
964 | cache->saved_regs[I386_EIP_REGNUM] -= cache->base; | |
965 | } | |
966 | else | |
967 | { | |
968 | frame_unwind_register (next_frame, I386_ESP_REGNUM, buf); | |
969 | cache->base = extract_unsigned_integer (buf, 4) + cache->sp_offset; | |
970 | } | |
acd5c798 MK |
971 | } |
972 | ||
973 | /* Now that we have the base address for the stack frame we can | |
974 | calculate the value of %esp in the calling frame. */ | |
92dd43fa MK |
975 | if (cache->saved_sp == 0) |
976 | cache->saved_sp = cache->base + 8; | |
a7769679 | 977 | |
acd5c798 MK |
978 | /* Adjust all the saved registers such that they contain addresses |
979 | instead of offsets. */ | |
980 | for (i = 0; i < I386_NUM_SAVED_REGS; i++) | |
fd13a04a AC |
981 | if (cache->saved_regs[i] != -1) |
982 | cache->saved_regs[i] += cache->base; | |
acd5c798 MK |
983 | |
984 | return cache; | |
a7769679 MK |
985 | } |
986 | ||
3a1e71e3 | 987 | static void |
acd5c798 MK |
988 | i386_frame_this_id (struct frame_info *next_frame, void **this_cache, |
989 | struct frame_id *this_id) | |
c906108c | 990 | { |
acd5c798 MK |
991 | struct i386_frame_cache *cache = i386_frame_cache (next_frame, this_cache); |
992 | ||
993 | /* This marks the outermost frame. */ | |
994 | if (cache->base == 0) | |
995 | return; | |
996 | ||
3e210248 | 997 | /* See the end of i386_push_dummy_call. */ |
acd5c798 MK |
998 | (*this_id) = frame_id_build (cache->base + 8, cache->pc); |
999 | } | |
1000 | ||
1001 | static void | |
1002 | i386_frame_prev_register (struct frame_info *next_frame, void **this_cache, | |
1003 | int regnum, int *optimizedp, | |
1004 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
c6826062 | 1005 | int *realnump, gdb_byte *valuep) |
acd5c798 MK |
1006 | { |
1007 | struct i386_frame_cache *cache = i386_frame_cache (next_frame, this_cache); | |
1008 | ||
1009 | gdb_assert (regnum >= 0); | |
1010 | ||
1011 | /* The System V ABI says that: | |
1012 | ||
1013 | "The flags register contains the system flags, such as the | |
1014 | direction flag and the carry flag. The direction flag must be | |
1015 | set to the forward (that is, zero) direction before entry and | |
1016 | upon exit from a function. Other user flags have no specified | |
1017 | role in the standard calling sequence and are not preserved." | |
1018 | ||
1019 | To guarantee the "upon exit" part of that statement we fake a | |
1020 | saved flags register that has its direction flag cleared. | |
1021 | ||
1022 | Note that GCC doesn't seem to rely on the fact that the direction | |
1023 | flag is cleared after a function return; it always explicitly | |
1024 | clears the flag before operations where it matters. | |
1025 | ||
1026 | FIXME: kettenis/20030316: I'm not quite sure whether this is the | |
1027 | right thing to do. The way we fake the flags register here makes | |
1028 | it impossible to change it. */ | |
1029 | ||
1030 | if (regnum == I386_EFLAGS_REGNUM) | |
1031 | { | |
1032 | *optimizedp = 0; | |
1033 | *lvalp = not_lval; | |
1034 | *addrp = 0; | |
1035 | *realnump = -1; | |
1036 | if (valuep) | |
1037 | { | |
1038 | ULONGEST val; | |
c5aa993b | 1039 | |
acd5c798 | 1040 | /* Clear the direction flag. */ |
f837910f MK |
1041 | val = frame_unwind_register_unsigned (next_frame, |
1042 | I386_EFLAGS_REGNUM); | |
acd5c798 MK |
1043 | val &= ~(1 << 10); |
1044 | store_unsigned_integer (valuep, 4, val); | |
1045 | } | |
1046 | ||
1047 | return; | |
1048 | } | |
1211c4e4 | 1049 | |
acd5c798 | 1050 | if (regnum == I386_EIP_REGNUM && cache->pc_in_eax) |
c906108c | 1051 | { |
00b25ff3 AC |
1052 | *optimizedp = 0; |
1053 | *lvalp = lval_register; | |
1054 | *addrp = 0; | |
1055 | *realnump = I386_EAX_REGNUM; | |
1056 | if (valuep) | |
1057 | frame_unwind_register (next_frame, (*realnump), valuep); | |
acd5c798 MK |
1058 | return; |
1059 | } | |
1060 | ||
1061 | if (regnum == I386_ESP_REGNUM && cache->saved_sp) | |
1062 | { | |
1063 | *optimizedp = 0; | |
1064 | *lvalp = not_lval; | |
1065 | *addrp = 0; | |
1066 | *realnump = -1; | |
1067 | if (valuep) | |
c906108c | 1068 | { |
acd5c798 MK |
1069 | /* Store the value. */ |
1070 | store_unsigned_integer (valuep, 4, cache->saved_sp); | |
c906108c | 1071 | } |
acd5c798 | 1072 | return; |
c906108c | 1073 | } |
acd5c798 | 1074 | |
fd13a04a AC |
1075 | if (regnum < I386_NUM_SAVED_REGS && cache->saved_regs[regnum] != -1) |
1076 | { | |
1077 | *optimizedp = 0; | |
1078 | *lvalp = lval_memory; | |
1079 | *addrp = cache->saved_regs[regnum]; | |
1080 | *realnump = -1; | |
1081 | if (valuep) | |
1082 | { | |
1083 | /* Read the value in from memory. */ | |
1084 | read_memory (*addrp, valuep, | |
1085 | register_size (current_gdbarch, regnum)); | |
1086 | } | |
1087 | return; | |
1088 | } | |
1089 | ||
00b25ff3 AC |
1090 | *optimizedp = 0; |
1091 | *lvalp = lval_register; | |
1092 | *addrp = 0; | |
1093 | *realnump = regnum; | |
1094 | if (valuep) | |
1095 | frame_unwind_register (next_frame, (*realnump), valuep); | |
acd5c798 MK |
1096 | } |
1097 | ||
1098 | static const struct frame_unwind i386_frame_unwind = | |
1099 | { | |
1100 | NORMAL_FRAME, | |
1101 | i386_frame_this_id, | |
1102 | i386_frame_prev_register | |
1103 | }; | |
1104 | ||
1105 | static const struct frame_unwind * | |
336d1bba | 1106 | i386_frame_sniffer (struct frame_info *next_frame) |
acd5c798 MK |
1107 | { |
1108 | return &i386_frame_unwind; | |
1109 | } | |
1110 | \f | |
1111 | ||
1112 | /* Signal trampolines. */ | |
1113 | ||
1114 | static struct i386_frame_cache * | |
1115 | i386_sigtramp_frame_cache (struct frame_info *next_frame, void **this_cache) | |
1116 | { | |
1117 | struct i386_frame_cache *cache; | |
1118 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
1119 | CORE_ADDR addr; | |
63c0089f | 1120 | gdb_byte buf[4]; |
acd5c798 MK |
1121 | |
1122 | if (*this_cache) | |
1123 | return *this_cache; | |
1124 | ||
fd13a04a | 1125 | cache = i386_alloc_frame_cache (); |
acd5c798 MK |
1126 | |
1127 | frame_unwind_register (next_frame, I386_ESP_REGNUM, buf); | |
1128 | cache->base = extract_unsigned_integer (buf, 4) - 4; | |
1129 | ||
1130 | addr = tdep->sigcontext_addr (next_frame); | |
a3386186 MK |
1131 | if (tdep->sc_reg_offset) |
1132 | { | |
1133 | int i; | |
1134 | ||
1135 | gdb_assert (tdep->sc_num_regs <= I386_NUM_SAVED_REGS); | |
1136 | ||
1137 | for (i = 0; i < tdep->sc_num_regs; i++) | |
1138 | if (tdep->sc_reg_offset[i] != -1) | |
fd13a04a | 1139 | cache->saved_regs[i] = addr + tdep->sc_reg_offset[i]; |
a3386186 MK |
1140 | } |
1141 | else | |
1142 | { | |
fd13a04a AC |
1143 | cache->saved_regs[I386_EIP_REGNUM] = addr + tdep->sc_pc_offset; |
1144 | cache->saved_regs[I386_ESP_REGNUM] = addr + tdep->sc_sp_offset; | |
a3386186 | 1145 | } |
acd5c798 MK |
1146 | |
1147 | *this_cache = cache; | |
1148 | return cache; | |
1149 | } | |
1150 | ||
1151 | static void | |
1152 | i386_sigtramp_frame_this_id (struct frame_info *next_frame, void **this_cache, | |
1153 | struct frame_id *this_id) | |
1154 | { | |
1155 | struct i386_frame_cache *cache = | |
1156 | i386_sigtramp_frame_cache (next_frame, this_cache); | |
1157 | ||
3e210248 | 1158 | /* See the end of i386_push_dummy_call. */ |
acd5c798 MK |
1159 | (*this_id) = frame_id_build (cache->base + 8, frame_pc_unwind (next_frame)); |
1160 | } | |
1161 | ||
1162 | static void | |
1163 | i386_sigtramp_frame_prev_register (struct frame_info *next_frame, | |
1164 | void **this_cache, | |
1165 | int regnum, int *optimizedp, | |
1166 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
c6826062 | 1167 | int *realnump, gdb_byte *valuep) |
acd5c798 MK |
1168 | { |
1169 | /* Make sure we've initialized the cache. */ | |
1170 | i386_sigtramp_frame_cache (next_frame, this_cache); | |
1171 | ||
1172 | i386_frame_prev_register (next_frame, this_cache, regnum, | |
1173 | optimizedp, lvalp, addrp, realnump, valuep); | |
c906108c | 1174 | } |
c0d1d883 | 1175 | |
acd5c798 MK |
1176 | static const struct frame_unwind i386_sigtramp_frame_unwind = |
1177 | { | |
1178 | SIGTRAMP_FRAME, | |
1179 | i386_sigtramp_frame_this_id, | |
1180 | i386_sigtramp_frame_prev_register | |
1181 | }; | |
1182 | ||
1183 | static const struct frame_unwind * | |
336d1bba | 1184 | i386_sigtramp_frame_sniffer (struct frame_info *next_frame) |
acd5c798 | 1185 | { |
911bc6ee | 1186 | struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (next_frame)); |
acd5c798 | 1187 | |
911bc6ee MK |
1188 | /* We shouldn't even bother if we don't have a sigcontext_addr |
1189 | handler. */ | |
1190 | if (tdep->sigcontext_addr == NULL) | |
1c3545ae MK |
1191 | return NULL; |
1192 | ||
911bc6ee MK |
1193 | if (tdep->sigtramp_p != NULL) |
1194 | { | |
1195 | if (tdep->sigtramp_p (next_frame)) | |
1196 | return &i386_sigtramp_frame_unwind; | |
1197 | } | |
1198 | ||
1199 | if (tdep->sigtramp_start != 0) | |
1200 | { | |
1201 | CORE_ADDR pc = frame_pc_unwind (next_frame); | |
1202 | ||
1203 | gdb_assert (tdep->sigtramp_end != 0); | |
1204 | if (pc >= tdep->sigtramp_start && pc < tdep->sigtramp_end) | |
1205 | return &i386_sigtramp_frame_unwind; | |
1206 | } | |
acd5c798 MK |
1207 | |
1208 | return NULL; | |
1209 | } | |
1210 | \f | |
1211 | ||
1212 | static CORE_ADDR | |
1213 | i386_frame_base_address (struct frame_info *next_frame, void **this_cache) | |
1214 | { | |
1215 | struct i386_frame_cache *cache = i386_frame_cache (next_frame, this_cache); | |
1216 | ||
1217 | return cache->base; | |
1218 | } | |
1219 | ||
1220 | static const struct frame_base i386_frame_base = | |
1221 | { | |
1222 | &i386_frame_unwind, | |
1223 | i386_frame_base_address, | |
1224 | i386_frame_base_address, | |
1225 | i386_frame_base_address | |
1226 | }; | |
1227 | ||
acd5c798 MK |
1228 | static struct frame_id |
1229 | i386_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
1230 | { | |
63c0089f | 1231 | gdb_byte buf[4]; |
acd5c798 MK |
1232 | CORE_ADDR fp; |
1233 | ||
1234 | frame_unwind_register (next_frame, I386_EBP_REGNUM, buf); | |
1235 | fp = extract_unsigned_integer (buf, 4); | |
1236 | ||
3e210248 | 1237 | /* See the end of i386_push_dummy_call. */ |
acd5c798 | 1238 | return frame_id_build (fp + 8, frame_pc_unwind (next_frame)); |
c0d1d883 | 1239 | } |
fc338970 | 1240 | \f |
c906108c | 1241 | |
fc338970 MK |
1242 | /* Figure out where the longjmp will land. Slurp the args out of the |
1243 | stack. We expect the first arg to be a pointer to the jmp_buf | |
8201327c | 1244 | structure from which we extract the address that we will land at. |
28bcfd30 | 1245 | This address is copied into PC. This routine returns non-zero on |
acd5c798 MK |
1246 | success. |
1247 | ||
1248 | This function is 64-bit safe. */ | |
c906108c | 1249 | |
8201327c MK |
1250 | static int |
1251 | i386_get_longjmp_target (CORE_ADDR *pc) | |
c906108c | 1252 | { |
63c0089f | 1253 | gdb_byte buf[8]; |
c906108c | 1254 | CORE_ADDR sp, jb_addr; |
8201327c | 1255 | int jb_pc_offset = gdbarch_tdep (current_gdbarch)->jb_pc_offset; |
f9d3c2a8 | 1256 | int len = TYPE_LENGTH (builtin_type_void_func_ptr); |
c906108c | 1257 | |
8201327c MK |
1258 | /* If JB_PC_OFFSET is -1, we have no way to find out where the |
1259 | longjmp will land. */ | |
1260 | if (jb_pc_offset == -1) | |
c906108c SS |
1261 | return 0; |
1262 | ||
f837910f MK |
1263 | /* Don't use I386_ESP_REGNUM here, since this function is also used |
1264 | for AMD64. */ | |
1265 | regcache_cooked_read (current_regcache, SP_REGNUM, buf); | |
1266 | sp = extract_typed_address (buf, builtin_type_void_data_ptr); | |
28bcfd30 | 1267 | if (target_read_memory (sp + len, buf, len)) |
c906108c SS |
1268 | return 0; |
1269 | ||
f837910f | 1270 | jb_addr = extract_typed_address (buf, builtin_type_void_data_ptr); |
28bcfd30 | 1271 | if (target_read_memory (jb_addr + jb_pc_offset, buf, len)) |
8201327c | 1272 | return 0; |
c906108c | 1273 | |
f9d3c2a8 | 1274 | *pc = extract_typed_address (buf, builtin_type_void_func_ptr); |
c906108c SS |
1275 | return 1; |
1276 | } | |
fc338970 | 1277 | \f |
c906108c | 1278 | |
3a1e71e3 | 1279 | static CORE_ADDR |
7d9b040b | 1280 | i386_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
6a65450a AC |
1281 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, |
1282 | struct value **args, CORE_ADDR sp, int struct_return, | |
1283 | CORE_ADDR struct_addr) | |
22f8ba57 | 1284 | { |
63c0089f | 1285 | gdb_byte buf[4]; |
acd5c798 MK |
1286 | int i; |
1287 | ||
1288 | /* Push arguments in reverse order. */ | |
1289 | for (i = nargs - 1; i >= 0; i--) | |
22f8ba57 | 1290 | { |
4754a64e | 1291 | int len = TYPE_LENGTH (value_enclosing_type (args[i])); |
acd5c798 MK |
1292 | |
1293 | /* The System V ABI says that: | |
1294 | ||
1295 | "An argument's size is increased, if necessary, to make it a | |
1296 | multiple of [32-bit] words. This may require tail padding, | |
1297 | depending on the size of the argument." | |
1298 | ||
1299 | This makes sure the stack says word-aligned. */ | |
1300 | sp -= (len + 3) & ~3; | |
46615f07 | 1301 | write_memory (sp, value_contents_all (args[i]), len); |
acd5c798 | 1302 | } |
22f8ba57 | 1303 | |
acd5c798 MK |
1304 | /* Push value address. */ |
1305 | if (struct_return) | |
1306 | { | |
22f8ba57 | 1307 | sp -= 4; |
fbd9dcd3 | 1308 | store_unsigned_integer (buf, 4, struct_addr); |
22f8ba57 MK |
1309 | write_memory (sp, buf, 4); |
1310 | } | |
1311 | ||
acd5c798 MK |
1312 | /* Store return address. */ |
1313 | sp -= 4; | |
6a65450a | 1314 | store_unsigned_integer (buf, 4, bp_addr); |
acd5c798 MK |
1315 | write_memory (sp, buf, 4); |
1316 | ||
1317 | /* Finally, update the stack pointer... */ | |
1318 | store_unsigned_integer (buf, 4, sp); | |
1319 | regcache_cooked_write (regcache, I386_ESP_REGNUM, buf); | |
1320 | ||
1321 | /* ...and fake a frame pointer. */ | |
1322 | regcache_cooked_write (regcache, I386_EBP_REGNUM, buf); | |
1323 | ||
3e210248 AC |
1324 | /* MarkK wrote: This "+ 8" is all over the place: |
1325 | (i386_frame_this_id, i386_sigtramp_frame_this_id, | |
1326 | i386_unwind_dummy_id). It's there, since all frame unwinders for | |
1327 | a given target have to agree (within a certain margin) on the | |
fd35795f | 1328 | definition of the stack address of a frame. Otherwise |
3e210248 AC |
1329 | frame_id_inner() won't work correctly. Since DWARF2/GCC uses the |
1330 | stack address *before* the function call as a frame's CFA. On | |
1331 | the i386, when %ebp is used as a frame pointer, the offset | |
1332 | between the contents %ebp and the CFA as defined by GCC. */ | |
1333 | return sp + 8; | |
22f8ba57 MK |
1334 | } |
1335 | ||
1a309862 MK |
1336 | /* These registers are used for returning integers (and on some |
1337 | targets also for returning `struct' and `union' values when their | |
ef9dff19 | 1338 | size and alignment match an integer type). */ |
acd5c798 MK |
1339 | #define LOW_RETURN_REGNUM I386_EAX_REGNUM /* %eax */ |
1340 | #define HIGH_RETURN_REGNUM I386_EDX_REGNUM /* %edx */ | |
1a309862 | 1341 | |
c5e656c1 MK |
1342 | /* Read, for architecture GDBARCH, a function return value of TYPE |
1343 | from REGCACHE, and copy that into VALBUF. */ | |
1a309862 | 1344 | |
3a1e71e3 | 1345 | static void |
c5e656c1 | 1346 | i386_extract_return_value (struct gdbarch *gdbarch, struct type *type, |
63c0089f | 1347 | struct regcache *regcache, gdb_byte *valbuf) |
c906108c | 1348 | { |
c5e656c1 | 1349 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
1a309862 | 1350 | int len = TYPE_LENGTH (type); |
63c0089f | 1351 | gdb_byte buf[I386_MAX_REGISTER_SIZE]; |
1a309862 | 1352 | |
1e8d0a7b | 1353 | if (TYPE_CODE (type) == TYPE_CODE_FLT) |
c906108c | 1354 | { |
5716833c | 1355 | if (tdep->st0_regnum < 0) |
1a309862 | 1356 | { |
8a3fe4f8 | 1357 | warning (_("Cannot find floating-point return value.")); |
1a309862 | 1358 | memset (valbuf, 0, len); |
ef9dff19 | 1359 | return; |
1a309862 MK |
1360 | } |
1361 | ||
c6ba6f0d MK |
1362 | /* Floating-point return values can be found in %st(0). Convert |
1363 | its contents to the desired type. This is probably not | |
1364 | exactly how it would happen on the target itself, but it is | |
1365 | the best we can do. */ | |
acd5c798 | 1366 | regcache_raw_read (regcache, I386_ST0_REGNUM, buf); |
00f8375e | 1367 | convert_typed_floating (buf, builtin_type_i387_ext, valbuf, type); |
c906108c SS |
1368 | } |
1369 | else | |
c5aa993b | 1370 | { |
f837910f MK |
1371 | int low_size = register_size (current_gdbarch, LOW_RETURN_REGNUM); |
1372 | int high_size = register_size (current_gdbarch, HIGH_RETURN_REGNUM); | |
d4f3574e SS |
1373 | |
1374 | if (len <= low_size) | |
00f8375e | 1375 | { |
0818c12a | 1376 | regcache_raw_read (regcache, LOW_RETURN_REGNUM, buf); |
00f8375e MK |
1377 | memcpy (valbuf, buf, len); |
1378 | } | |
d4f3574e SS |
1379 | else if (len <= (low_size + high_size)) |
1380 | { | |
0818c12a | 1381 | regcache_raw_read (regcache, LOW_RETURN_REGNUM, buf); |
00f8375e | 1382 | memcpy (valbuf, buf, low_size); |
0818c12a | 1383 | regcache_raw_read (regcache, HIGH_RETURN_REGNUM, buf); |
63c0089f | 1384 | memcpy (valbuf + low_size, buf, len - low_size); |
d4f3574e SS |
1385 | } |
1386 | else | |
8e65ff28 | 1387 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 1388 | _("Cannot extract return value of %d bytes long."), len); |
c906108c SS |
1389 | } |
1390 | } | |
1391 | ||
c5e656c1 MK |
1392 | /* Write, for architecture GDBARCH, a function return value of TYPE |
1393 | from VALBUF into REGCACHE. */ | |
ef9dff19 | 1394 | |
3a1e71e3 | 1395 | static void |
c5e656c1 | 1396 | i386_store_return_value (struct gdbarch *gdbarch, struct type *type, |
63c0089f | 1397 | struct regcache *regcache, const gdb_byte *valbuf) |
ef9dff19 | 1398 | { |
c5e656c1 | 1399 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
ef9dff19 MK |
1400 | int len = TYPE_LENGTH (type); |
1401 | ||
5716833c MK |
1402 | /* Define I387_ST0_REGNUM such that we use the proper definitions |
1403 | for the architecture. */ | |
1404 | #define I387_ST0_REGNUM I386_ST0_REGNUM | |
1405 | ||
1e8d0a7b | 1406 | if (TYPE_CODE (type) == TYPE_CODE_FLT) |
ef9dff19 | 1407 | { |
3d7f4f49 | 1408 | ULONGEST fstat; |
63c0089f | 1409 | gdb_byte buf[I386_MAX_REGISTER_SIZE]; |
ccb945b8 | 1410 | |
5716833c | 1411 | if (tdep->st0_regnum < 0) |
ef9dff19 | 1412 | { |
8a3fe4f8 | 1413 | warning (_("Cannot set floating-point return value.")); |
ef9dff19 MK |
1414 | return; |
1415 | } | |
1416 | ||
635b0cc1 MK |
1417 | /* Returning floating-point values is a bit tricky. Apart from |
1418 | storing the return value in %st(0), we have to simulate the | |
1419 | state of the FPU at function return point. */ | |
1420 | ||
c6ba6f0d MK |
1421 | /* Convert the value found in VALBUF to the extended |
1422 | floating-point format used by the FPU. This is probably | |
1423 | not exactly how it would happen on the target itself, but | |
1424 | it is the best we can do. */ | |
1425 | convert_typed_floating (valbuf, type, buf, builtin_type_i387_ext); | |
acd5c798 | 1426 | regcache_raw_write (regcache, I386_ST0_REGNUM, buf); |
ccb945b8 | 1427 | |
635b0cc1 MK |
1428 | /* Set the top of the floating-point register stack to 7. The |
1429 | actual value doesn't really matter, but 7 is what a normal | |
1430 | function return would end up with if the program started out | |
1431 | with a freshly initialized FPU. */ | |
5716833c | 1432 | regcache_raw_read_unsigned (regcache, I387_FSTAT_REGNUM, &fstat); |
ccb945b8 | 1433 | fstat |= (7 << 11); |
5716833c | 1434 | regcache_raw_write_unsigned (regcache, I387_FSTAT_REGNUM, fstat); |
ccb945b8 | 1435 | |
635b0cc1 MK |
1436 | /* Mark %st(1) through %st(7) as empty. Since we set the top of |
1437 | the floating-point register stack to 7, the appropriate value | |
1438 | for the tag word is 0x3fff. */ | |
5716833c | 1439 | regcache_raw_write_unsigned (regcache, I387_FTAG_REGNUM, 0x3fff); |
ef9dff19 MK |
1440 | } |
1441 | else | |
1442 | { | |
f837910f MK |
1443 | int low_size = register_size (current_gdbarch, LOW_RETURN_REGNUM); |
1444 | int high_size = register_size (current_gdbarch, HIGH_RETURN_REGNUM); | |
ef9dff19 MK |
1445 | |
1446 | if (len <= low_size) | |
3d7f4f49 | 1447 | regcache_raw_write_part (regcache, LOW_RETURN_REGNUM, 0, len, valbuf); |
ef9dff19 MK |
1448 | else if (len <= (low_size + high_size)) |
1449 | { | |
3d7f4f49 MK |
1450 | regcache_raw_write (regcache, LOW_RETURN_REGNUM, valbuf); |
1451 | regcache_raw_write_part (regcache, HIGH_RETURN_REGNUM, 0, | |
63c0089f | 1452 | len - low_size, valbuf + low_size); |
ef9dff19 MK |
1453 | } |
1454 | else | |
8e65ff28 | 1455 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 1456 | _("Cannot store return value of %d bytes long."), len); |
ef9dff19 | 1457 | } |
5716833c MK |
1458 | |
1459 | #undef I387_ST0_REGNUM | |
ef9dff19 | 1460 | } |
fc338970 | 1461 | \f |
ef9dff19 | 1462 | |
8201327c MK |
1463 | /* This is the variable that is set with "set struct-convention", and |
1464 | its legitimate values. */ | |
1465 | static const char default_struct_convention[] = "default"; | |
1466 | static const char pcc_struct_convention[] = "pcc"; | |
1467 | static const char reg_struct_convention[] = "reg"; | |
1468 | static const char *valid_conventions[] = | |
1469 | { | |
1470 | default_struct_convention, | |
1471 | pcc_struct_convention, | |
1472 | reg_struct_convention, | |
1473 | NULL | |
1474 | }; | |
1475 | static const char *struct_convention = default_struct_convention; | |
1476 | ||
0e4377e1 JB |
1477 | /* Return non-zero if TYPE, which is assumed to be a structure, |
1478 | a union type, or an array type, should be returned in registers | |
1479 | for architecture GDBARCH. */ | |
c5e656c1 | 1480 | |
8201327c | 1481 | static int |
c5e656c1 | 1482 | i386_reg_struct_return_p (struct gdbarch *gdbarch, struct type *type) |
8201327c | 1483 | { |
c5e656c1 MK |
1484 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
1485 | enum type_code code = TYPE_CODE (type); | |
1486 | int len = TYPE_LENGTH (type); | |
8201327c | 1487 | |
0e4377e1 JB |
1488 | gdb_assert (code == TYPE_CODE_STRUCT |
1489 | || code == TYPE_CODE_UNION | |
1490 | || code == TYPE_CODE_ARRAY); | |
c5e656c1 MK |
1491 | |
1492 | if (struct_convention == pcc_struct_convention | |
1493 | || (struct_convention == default_struct_convention | |
1494 | && tdep->struct_return == pcc_struct_return)) | |
1495 | return 0; | |
1496 | ||
9edde48e MK |
1497 | /* Structures consisting of a single `float', `double' or 'long |
1498 | double' member are returned in %st(0). */ | |
1499 | if (code == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1) | |
1500 | { | |
1501 | type = check_typedef (TYPE_FIELD_TYPE (type, 0)); | |
1502 | if (TYPE_CODE (type) == TYPE_CODE_FLT) | |
1503 | return (len == 4 || len == 8 || len == 12); | |
1504 | } | |
1505 | ||
c5e656c1 MK |
1506 | return (len == 1 || len == 2 || len == 4 || len == 8); |
1507 | } | |
1508 | ||
1509 | /* Determine, for architecture GDBARCH, how a return value of TYPE | |
1510 | should be returned. If it is supposed to be returned in registers, | |
1511 | and READBUF is non-zero, read the appropriate value from REGCACHE, | |
1512 | and copy it into READBUF. If WRITEBUF is non-zero, write the value | |
1513 | from WRITEBUF into REGCACHE. */ | |
1514 | ||
1515 | static enum return_value_convention | |
1516 | i386_return_value (struct gdbarch *gdbarch, struct type *type, | |
42835c2b MK |
1517 | struct regcache *regcache, gdb_byte *readbuf, |
1518 | const gdb_byte *writebuf) | |
c5e656c1 MK |
1519 | { |
1520 | enum type_code code = TYPE_CODE (type); | |
1521 | ||
0e4377e1 JB |
1522 | if ((code == TYPE_CODE_STRUCT |
1523 | || code == TYPE_CODE_UNION | |
1524 | || code == TYPE_CODE_ARRAY) | |
c5e656c1 | 1525 | && !i386_reg_struct_return_p (gdbarch, type)) |
31db7b6c MK |
1526 | { |
1527 | /* The System V ABI says that: | |
1528 | ||
1529 | "A function that returns a structure or union also sets %eax | |
1530 | to the value of the original address of the caller's area | |
1531 | before it returns. Thus when the caller receives control | |
1532 | again, the address of the returned object resides in register | |
1533 | %eax and can be used to access the object." | |
1534 | ||
1535 | So the ABI guarantees that we can always find the return | |
1536 | value just after the function has returned. */ | |
1537 | ||
0e4377e1 JB |
1538 | /* Note that the ABI doesn't mention functions returning arrays, |
1539 | which is something possible in certain languages such as Ada. | |
1540 | In this case, the value is returned as if it was wrapped in | |
1541 | a record, so the convention applied to records also applies | |
1542 | to arrays. */ | |
1543 | ||
31db7b6c MK |
1544 | if (readbuf) |
1545 | { | |
1546 | ULONGEST addr; | |
1547 | ||
1548 | regcache_raw_read_unsigned (regcache, I386_EAX_REGNUM, &addr); | |
1549 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
1550 | } | |
1551 | ||
1552 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
1553 | } | |
c5e656c1 MK |
1554 | |
1555 | /* This special case is for structures consisting of a single | |
9edde48e MK |
1556 | `float', `double' or 'long double' member. These structures are |
1557 | returned in %st(0). For these structures, we call ourselves | |
1558 | recursively, changing TYPE into the type of the first member of | |
1559 | the structure. Since that should work for all structures that | |
1560 | have only one member, we don't bother to check the member's type | |
1561 | here. */ | |
c5e656c1 MK |
1562 | if (code == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1) |
1563 | { | |
1564 | type = check_typedef (TYPE_FIELD_TYPE (type, 0)); | |
1565 | return i386_return_value (gdbarch, type, regcache, readbuf, writebuf); | |
1566 | } | |
1567 | ||
1568 | if (readbuf) | |
1569 | i386_extract_return_value (gdbarch, type, regcache, readbuf); | |
1570 | if (writebuf) | |
1571 | i386_store_return_value (gdbarch, type, regcache, writebuf); | |
8201327c | 1572 | |
c5e656c1 | 1573 | return RETURN_VALUE_REGISTER_CONVENTION; |
8201327c MK |
1574 | } |
1575 | \f | |
1576 | ||
5ae96ec1 MK |
1577 | /* Type for %eflags. */ |
1578 | struct type *i386_eflags_type; | |
1579 | ||
21b4b2f2 | 1580 | /* Types for the MMX and SSE registers. */ |
5ae96ec1 MK |
1581 | struct type *i386_mmx_type; |
1582 | struct type *i386_sse_type; | |
878d9193 | 1583 | struct type *i386_mxcsr_type; |
5ae96ec1 MK |
1584 | |
1585 | /* Construct types for ISA-specific registers. */ | |
1586 | static void | |
1587 | i386_init_types (void) | |
1588 | { | |
1589 | struct type *type; | |
1590 | ||
1591 | type = init_flags_type ("builtin_type_i386_eflags", 4); | |
1592 | append_flags_type_flag (type, 0, "CF"); | |
1593 | append_flags_type_flag (type, 1, NULL); | |
1594 | append_flags_type_flag (type, 2, "PF"); | |
1595 | append_flags_type_flag (type, 4, "AF"); | |
1596 | append_flags_type_flag (type, 6, "ZF"); | |
1597 | append_flags_type_flag (type, 7, "SF"); | |
1598 | append_flags_type_flag (type, 8, "TF"); | |
1599 | append_flags_type_flag (type, 9, "IF"); | |
1600 | append_flags_type_flag (type, 10, "DF"); | |
1601 | append_flags_type_flag (type, 11, "OF"); | |
1602 | append_flags_type_flag (type, 14, "NT"); | |
1603 | append_flags_type_flag (type, 16, "RF"); | |
1604 | append_flags_type_flag (type, 17, "VM"); | |
1605 | append_flags_type_flag (type, 18, "AC"); | |
1606 | append_flags_type_flag (type, 19, "VIF"); | |
1607 | append_flags_type_flag (type, 20, "VIP"); | |
1608 | append_flags_type_flag (type, 21, "ID"); | |
1609 | i386_eflags_type = type; | |
21b4b2f2 | 1610 | |
21b4b2f2 JB |
1611 | /* The type we're building is this: */ |
1612 | #if 0 | |
5ae96ec1 | 1613 | union __gdb_builtin_type_vec64i |
21b4b2f2 JB |
1614 | { |
1615 | int64_t uint64; | |
1616 | int32_t v2_int32[2]; | |
1617 | int16_t v4_int16[4]; | |
1618 | int8_t v8_int8[8]; | |
1619 | }; | |
1620 | #endif | |
1621 | ||
5ae96ec1 MK |
1622 | type = init_composite_type ("__gdb_builtin_type_vec64i", TYPE_CODE_UNION); |
1623 | append_composite_type_field (type, "uint64", builtin_type_int64); | |
1624 | append_composite_type_field (type, "v2_int32", builtin_type_v2_int32); | |
1625 | append_composite_type_field (type, "v4_int16", builtin_type_v4_int16); | |
1626 | append_composite_type_field (type, "v8_int8", builtin_type_v8_int8); | |
1627 | TYPE_FLAGS (type) |= TYPE_FLAG_VECTOR; | |
1628 | TYPE_NAME (type) = "builtin_type_vec64i"; | |
1629 | i386_mmx_type = type; | |
21b4b2f2 | 1630 | |
5ae96ec1 MK |
1631 | /* The type we're building is this: */ |
1632 | #if 0 | |
1633 | union __gdb_builtin_type_vec128i | |
1634 | { | |
1635 | int128_t uint128; | |
1636 | int64_t v2_int64[2]; | |
1637 | int32_t v4_int32[4]; | |
1638 | int16_t v8_int16[8]; | |
1639 | int8_t v16_int8[16]; | |
1640 | double v2_double[2]; | |
1641 | float v4_float[4]; | |
1642 | }; | |
1643 | #endif | |
21b4b2f2 | 1644 | |
5ae96ec1 MK |
1645 | type = init_composite_type ("__gdb_builtin_type_vec128i", TYPE_CODE_UNION); |
1646 | append_composite_type_field (type, "v4_float", builtin_type_v4_float); | |
1647 | append_composite_type_field (type, "v2_double", builtin_type_v2_double); | |
1648 | append_composite_type_field (type, "v16_int8", builtin_type_v16_int8); | |
1649 | append_composite_type_field (type, "v8_int16", builtin_type_v8_int16); | |
1650 | append_composite_type_field (type, "v4_int32", builtin_type_v4_int32); | |
1651 | append_composite_type_field (type, "v2_int64", builtin_type_v2_int64); | |
1652 | append_composite_type_field (type, "uint128", builtin_type_int128); | |
1653 | TYPE_FLAGS (type) |= TYPE_FLAG_VECTOR; | |
1654 | TYPE_NAME (type) = "builtin_type_vec128i"; | |
1655 | i386_sse_type = type; | |
878d9193 MK |
1656 | |
1657 | type = init_flags_type ("builtin_type_i386_mxcsr", 4); | |
1658 | append_flags_type_flag (type, 0, "IE"); | |
1659 | append_flags_type_flag (type, 1, "DE"); | |
1660 | append_flags_type_flag (type, 2, "ZE"); | |
1661 | append_flags_type_flag (type, 3, "OE"); | |
1662 | append_flags_type_flag (type, 4, "UE"); | |
1663 | append_flags_type_flag (type, 5, "PE"); | |
1664 | append_flags_type_flag (type, 6, "DAZ"); | |
1665 | append_flags_type_flag (type, 7, "IM"); | |
1666 | append_flags_type_flag (type, 8, "DM"); | |
1667 | append_flags_type_flag (type, 9, "ZM"); | |
1668 | append_flags_type_flag (type, 10, "OM"); | |
1669 | append_flags_type_flag (type, 11, "UM"); | |
1670 | append_flags_type_flag (type, 12, "PM"); | |
1671 | append_flags_type_flag (type, 15, "FZ"); | |
1672 | i386_mxcsr_type = type; | |
21b4b2f2 JB |
1673 | } |
1674 | ||
d7a0d72c MK |
1675 | /* Return the GDB type object for the "standard" data type of data in |
1676 | register REGNUM. Perhaps %esi and %edi should go here, but | |
1677 | potentially they could be used for things other than address. */ | |
1678 | ||
3a1e71e3 | 1679 | static struct type * |
4e259f09 | 1680 | i386_register_type (struct gdbarch *gdbarch, int regnum) |
d7a0d72c | 1681 | { |
ab533587 MK |
1682 | if (regnum == I386_EIP_REGNUM) |
1683 | return builtin_type_void_func_ptr; | |
1684 | ||
5ae96ec1 MK |
1685 | if (regnum == I386_EFLAGS_REGNUM) |
1686 | return i386_eflags_type; | |
1687 | ||
ab533587 MK |
1688 | if (regnum == I386_EBP_REGNUM || regnum == I386_ESP_REGNUM) |
1689 | return builtin_type_void_data_ptr; | |
d7a0d72c | 1690 | |
23a34459 | 1691 | if (i386_fp_regnum_p (regnum)) |
c6ba6f0d | 1692 | return builtin_type_i387_ext; |
d7a0d72c | 1693 | |
878d9193 MK |
1694 | if (i386_mmx_regnum_p (gdbarch, regnum)) |
1695 | return i386_mmx_type; | |
1696 | ||
5716833c | 1697 | if (i386_sse_regnum_p (gdbarch, regnum)) |
5ae96ec1 | 1698 | return i386_sse_type; |
d7a0d72c | 1699 | |
878d9193 MK |
1700 | #define I387_ST0_REGNUM I386_ST0_REGNUM |
1701 | #define I387_NUM_XMM_REGS (gdbarch_tdep (current_gdbarch)->num_xmm_regs) | |
1702 | ||
1703 | if (regnum == I387_MXCSR_REGNUM) | |
1704 | return i386_mxcsr_type; | |
1705 | ||
1706 | #undef I387_ST0_REGNUM | |
1707 | #undef I387_NUM_XMM_REGS | |
28fc6740 | 1708 | |
d7a0d72c MK |
1709 | return builtin_type_int; |
1710 | } | |
1711 | ||
28fc6740 | 1712 | /* Map a cooked register onto a raw register or memory. For the i386, |
acd5c798 | 1713 | the MMX registers need to be mapped onto floating point registers. */ |
28fc6740 AC |
1714 | |
1715 | static int | |
c86c27af | 1716 | i386_mmx_regnum_to_fp_regnum (struct regcache *regcache, int regnum) |
28fc6740 | 1717 | { |
5716833c MK |
1718 | struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache)); |
1719 | int mmxreg, fpreg; | |
28fc6740 AC |
1720 | ULONGEST fstat; |
1721 | int tos; | |
c86c27af | 1722 | |
5716833c MK |
1723 | /* Define I387_ST0_REGNUM such that we use the proper definitions |
1724 | for REGCACHE's architecture. */ | |
1725 | #define I387_ST0_REGNUM tdep->st0_regnum | |
1726 | ||
1727 | mmxreg = regnum - tdep->mm0_regnum; | |
1728 | regcache_raw_read_unsigned (regcache, I387_FSTAT_REGNUM, &fstat); | |
28fc6740 | 1729 | tos = (fstat >> 11) & 0x7; |
5716833c MK |
1730 | fpreg = (mmxreg + tos) % 8; |
1731 | ||
1732 | return (I387_ST0_REGNUM + fpreg); | |
c86c27af | 1733 | |
5716833c | 1734 | #undef I387_ST0_REGNUM |
28fc6740 AC |
1735 | } |
1736 | ||
1737 | static void | |
1738 | i386_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache, | |
42835c2b | 1739 | int regnum, gdb_byte *buf) |
28fc6740 | 1740 | { |
5716833c | 1741 | if (i386_mmx_regnum_p (gdbarch, regnum)) |
28fc6740 | 1742 | { |
63c0089f | 1743 | gdb_byte mmx_buf[MAX_REGISTER_SIZE]; |
c86c27af MK |
1744 | int fpnum = i386_mmx_regnum_to_fp_regnum (regcache, regnum); |
1745 | ||
28fc6740 | 1746 | /* Extract (always little endian). */ |
c86c27af | 1747 | regcache_raw_read (regcache, fpnum, mmx_buf); |
f837910f | 1748 | memcpy (buf, mmx_buf, register_size (gdbarch, regnum)); |
28fc6740 AC |
1749 | } |
1750 | else | |
1751 | regcache_raw_read (regcache, regnum, buf); | |
1752 | } | |
1753 | ||
1754 | static void | |
1755 | i386_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache, | |
42835c2b | 1756 | int regnum, const gdb_byte *buf) |
28fc6740 | 1757 | { |
5716833c | 1758 | if (i386_mmx_regnum_p (gdbarch, regnum)) |
28fc6740 | 1759 | { |
63c0089f | 1760 | gdb_byte mmx_buf[MAX_REGISTER_SIZE]; |
c86c27af MK |
1761 | int fpnum = i386_mmx_regnum_to_fp_regnum (regcache, regnum); |
1762 | ||
28fc6740 AC |
1763 | /* Read ... */ |
1764 | regcache_raw_read (regcache, fpnum, mmx_buf); | |
1765 | /* ... Modify ... (always little endian). */ | |
f837910f | 1766 | memcpy (mmx_buf, buf, register_size (gdbarch, regnum)); |
28fc6740 AC |
1767 | /* ... Write. */ |
1768 | regcache_raw_write (regcache, fpnum, mmx_buf); | |
1769 | } | |
1770 | else | |
1771 | regcache_raw_write (regcache, regnum, buf); | |
1772 | } | |
ff2e87ac AC |
1773 | \f |
1774 | ||
ff2e87ac AC |
1775 | /* Return the register number of the register allocated by GCC after |
1776 | REGNUM, or -1 if there is no such register. */ | |
1777 | ||
1778 | static int | |
1779 | i386_next_regnum (int regnum) | |
1780 | { | |
1781 | /* GCC allocates the registers in the order: | |
1782 | ||
1783 | %eax, %edx, %ecx, %ebx, %esi, %edi, %ebp, %esp, ... | |
1784 | ||
1785 | Since storing a variable in %esp doesn't make any sense we return | |
1786 | -1 for %ebp and for %esp itself. */ | |
1787 | static int next_regnum[] = | |
1788 | { | |
1789 | I386_EDX_REGNUM, /* Slot for %eax. */ | |
1790 | I386_EBX_REGNUM, /* Slot for %ecx. */ | |
1791 | I386_ECX_REGNUM, /* Slot for %edx. */ | |
1792 | I386_ESI_REGNUM, /* Slot for %ebx. */ | |
1793 | -1, -1, /* Slots for %esp and %ebp. */ | |
1794 | I386_EDI_REGNUM, /* Slot for %esi. */ | |
1795 | I386_EBP_REGNUM /* Slot for %edi. */ | |
1796 | }; | |
1797 | ||
de5b9bb9 | 1798 | if (regnum >= 0 && regnum < sizeof (next_regnum) / sizeof (next_regnum[0])) |
ff2e87ac | 1799 | return next_regnum[regnum]; |
28fc6740 | 1800 | |
ff2e87ac AC |
1801 | return -1; |
1802 | } | |
1803 | ||
1804 | /* Return nonzero if a value of type TYPE stored in register REGNUM | |
1805 | needs any special handling. */ | |
d7a0d72c | 1806 | |
3a1e71e3 | 1807 | static int |
ff2e87ac | 1808 | i386_convert_register_p (int regnum, struct type *type) |
d7a0d72c | 1809 | { |
de5b9bb9 MK |
1810 | int len = TYPE_LENGTH (type); |
1811 | ||
ff2e87ac AC |
1812 | /* Values may be spread across multiple registers. Most debugging |
1813 | formats aren't expressive enough to specify the locations, so | |
1814 | some heuristics is involved. Right now we only handle types that | |
de5b9bb9 MK |
1815 | have a length that is a multiple of the word size, since GCC |
1816 | doesn't seem to put any other types into registers. */ | |
1817 | if (len > 4 && len % 4 == 0) | |
1818 | { | |
1819 | int last_regnum = regnum; | |
1820 | ||
1821 | while (len > 4) | |
1822 | { | |
1823 | last_regnum = i386_next_regnum (last_regnum); | |
1824 | len -= 4; | |
1825 | } | |
1826 | ||
1827 | if (last_regnum != -1) | |
1828 | return 1; | |
1829 | } | |
ff2e87ac | 1830 | |
23a34459 | 1831 | return i386_fp_regnum_p (regnum); |
d7a0d72c MK |
1832 | } |
1833 | ||
ff2e87ac AC |
1834 | /* Read a value of type TYPE from register REGNUM in frame FRAME, and |
1835 | return its contents in TO. */ | |
ac27f131 | 1836 | |
3a1e71e3 | 1837 | static void |
ff2e87ac | 1838 | i386_register_to_value (struct frame_info *frame, int regnum, |
42835c2b | 1839 | struct type *type, gdb_byte *to) |
ac27f131 | 1840 | { |
de5b9bb9 | 1841 | int len = TYPE_LENGTH (type); |
de5b9bb9 | 1842 | |
ff2e87ac AC |
1843 | /* FIXME: kettenis/20030609: What should we do if REGNUM isn't |
1844 | available in FRAME (i.e. if it wasn't saved)? */ | |
3d261580 | 1845 | |
ff2e87ac | 1846 | if (i386_fp_regnum_p (regnum)) |
8d7f6b4a | 1847 | { |
d532c08f MK |
1848 | i387_register_to_value (frame, regnum, type, to); |
1849 | return; | |
8d7f6b4a | 1850 | } |
ff2e87ac | 1851 | |
fd35795f | 1852 | /* Read a value spread across multiple registers. */ |
de5b9bb9 MK |
1853 | |
1854 | gdb_assert (len > 4 && len % 4 == 0); | |
3d261580 | 1855 | |
de5b9bb9 MK |
1856 | while (len > 0) |
1857 | { | |
1858 | gdb_assert (regnum != -1); | |
1859 | gdb_assert (register_size (current_gdbarch, regnum) == 4); | |
d532c08f | 1860 | |
42835c2b | 1861 | get_frame_register (frame, regnum, to); |
de5b9bb9 MK |
1862 | regnum = i386_next_regnum (regnum); |
1863 | len -= 4; | |
42835c2b | 1864 | to += 4; |
de5b9bb9 | 1865 | } |
ac27f131 MK |
1866 | } |
1867 | ||
ff2e87ac AC |
1868 | /* Write the contents FROM of a value of type TYPE into register |
1869 | REGNUM in frame FRAME. */ | |
ac27f131 | 1870 | |
3a1e71e3 | 1871 | static void |
ff2e87ac | 1872 | i386_value_to_register (struct frame_info *frame, int regnum, |
42835c2b | 1873 | struct type *type, const gdb_byte *from) |
ac27f131 | 1874 | { |
de5b9bb9 | 1875 | int len = TYPE_LENGTH (type); |
de5b9bb9 | 1876 | |
ff2e87ac | 1877 | if (i386_fp_regnum_p (regnum)) |
c6ba6f0d | 1878 | { |
d532c08f MK |
1879 | i387_value_to_register (frame, regnum, type, from); |
1880 | return; | |
1881 | } | |
3d261580 | 1882 | |
fd35795f | 1883 | /* Write a value spread across multiple registers. */ |
de5b9bb9 MK |
1884 | |
1885 | gdb_assert (len > 4 && len % 4 == 0); | |
ff2e87ac | 1886 | |
de5b9bb9 MK |
1887 | while (len > 0) |
1888 | { | |
1889 | gdb_assert (regnum != -1); | |
1890 | gdb_assert (register_size (current_gdbarch, regnum) == 4); | |
d532c08f | 1891 | |
42835c2b | 1892 | put_frame_register (frame, regnum, from); |
de5b9bb9 MK |
1893 | regnum = i386_next_regnum (regnum); |
1894 | len -= 4; | |
42835c2b | 1895 | from += 4; |
de5b9bb9 | 1896 | } |
ac27f131 | 1897 | } |
ff2e87ac | 1898 | \f |
7fdafb5a MK |
1899 | /* Supply register REGNUM from the buffer specified by GREGS and LEN |
1900 | in the general-purpose register set REGSET to register cache | |
1901 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
ff2e87ac | 1902 | |
20187ed5 | 1903 | void |
473f17b0 MK |
1904 | i386_supply_gregset (const struct regset *regset, struct regcache *regcache, |
1905 | int regnum, const void *gregs, size_t len) | |
1906 | { | |
9ea75c57 | 1907 | const struct gdbarch_tdep *tdep = gdbarch_tdep (regset->arch); |
156cdbee | 1908 | const gdb_byte *regs = gregs; |
473f17b0 MK |
1909 | int i; |
1910 | ||
1911 | gdb_assert (len == tdep->sizeof_gregset); | |
1912 | ||
1913 | for (i = 0; i < tdep->gregset_num_regs; i++) | |
1914 | { | |
1915 | if ((regnum == i || regnum == -1) | |
1916 | && tdep->gregset_reg_offset[i] != -1) | |
1917 | regcache_raw_supply (regcache, i, regs + tdep->gregset_reg_offset[i]); | |
1918 | } | |
1919 | } | |
1920 | ||
7fdafb5a MK |
1921 | /* Collect register REGNUM from the register cache REGCACHE and store |
1922 | it in the buffer specified by GREGS and LEN as described by the | |
1923 | general-purpose register set REGSET. If REGNUM is -1, do this for | |
1924 | all registers in REGSET. */ | |
1925 | ||
1926 | void | |
1927 | i386_collect_gregset (const struct regset *regset, | |
1928 | const struct regcache *regcache, | |
1929 | int regnum, void *gregs, size_t len) | |
1930 | { | |
1931 | const struct gdbarch_tdep *tdep = gdbarch_tdep (regset->arch); | |
156cdbee | 1932 | gdb_byte *regs = gregs; |
7fdafb5a MK |
1933 | int i; |
1934 | ||
1935 | gdb_assert (len == tdep->sizeof_gregset); | |
1936 | ||
1937 | for (i = 0; i < tdep->gregset_num_regs; i++) | |
1938 | { | |
1939 | if ((regnum == i || regnum == -1) | |
1940 | && tdep->gregset_reg_offset[i] != -1) | |
1941 | regcache_raw_collect (regcache, i, regs + tdep->gregset_reg_offset[i]); | |
1942 | } | |
1943 | } | |
1944 | ||
1945 | /* Supply register REGNUM from the buffer specified by FPREGS and LEN | |
1946 | in the floating-point register set REGSET to register cache | |
1947 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
473f17b0 MK |
1948 | |
1949 | static void | |
1950 | i386_supply_fpregset (const struct regset *regset, struct regcache *regcache, | |
1951 | int regnum, const void *fpregs, size_t len) | |
1952 | { | |
9ea75c57 | 1953 | const struct gdbarch_tdep *tdep = gdbarch_tdep (regset->arch); |
473f17b0 | 1954 | |
66a72d25 MK |
1955 | if (len == I387_SIZEOF_FXSAVE) |
1956 | { | |
1957 | i387_supply_fxsave (regcache, regnum, fpregs); | |
1958 | return; | |
1959 | } | |
1960 | ||
473f17b0 MK |
1961 | gdb_assert (len == tdep->sizeof_fpregset); |
1962 | i387_supply_fsave (regcache, regnum, fpregs); | |
1963 | } | |
8446b36a | 1964 | |
2f305df1 MK |
1965 | /* Collect register REGNUM from the register cache REGCACHE and store |
1966 | it in the buffer specified by FPREGS and LEN as described by the | |
1967 | floating-point register set REGSET. If REGNUM is -1, do this for | |
1968 | all registers in REGSET. */ | |
7fdafb5a MK |
1969 | |
1970 | static void | |
1971 | i386_collect_fpregset (const struct regset *regset, | |
1972 | const struct regcache *regcache, | |
1973 | int regnum, void *fpregs, size_t len) | |
1974 | { | |
1975 | const struct gdbarch_tdep *tdep = gdbarch_tdep (regset->arch); | |
1976 | ||
1977 | if (len == I387_SIZEOF_FXSAVE) | |
1978 | { | |
1979 | i387_collect_fxsave (regcache, regnum, fpregs); | |
1980 | return; | |
1981 | } | |
1982 | ||
1983 | gdb_assert (len == tdep->sizeof_fpregset); | |
1984 | i387_collect_fsave (regcache, regnum, fpregs); | |
1985 | } | |
1986 | ||
8446b36a MK |
1987 | /* Return the appropriate register set for the core section identified |
1988 | by SECT_NAME and SECT_SIZE. */ | |
1989 | ||
1990 | const struct regset * | |
1991 | i386_regset_from_core_section (struct gdbarch *gdbarch, | |
1992 | const char *sect_name, size_t sect_size) | |
1993 | { | |
1994 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1995 | ||
1996 | if (strcmp (sect_name, ".reg") == 0 && sect_size == tdep->sizeof_gregset) | |
1997 | { | |
1998 | if (tdep->gregset == NULL) | |
7fdafb5a MK |
1999 | tdep->gregset = regset_alloc (gdbarch, i386_supply_gregset, |
2000 | i386_collect_gregset); | |
8446b36a MK |
2001 | return tdep->gregset; |
2002 | } | |
2003 | ||
66a72d25 MK |
2004 | if ((strcmp (sect_name, ".reg2") == 0 && sect_size == tdep->sizeof_fpregset) |
2005 | || (strcmp (sect_name, ".reg-xfp") == 0 | |
2006 | && sect_size == I387_SIZEOF_FXSAVE)) | |
8446b36a MK |
2007 | { |
2008 | if (tdep->fpregset == NULL) | |
7fdafb5a MK |
2009 | tdep->fpregset = regset_alloc (gdbarch, i386_supply_fpregset, |
2010 | i386_collect_fpregset); | |
8446b36a MK |
2011 | return tdep->fpregset; |
2012 | } | |
2013 | ||
2014 | return NULL; | |
2015 | } | |
473f17b0 | 2016 | \f |
fc338970 | 2017 | |
c906108c | 2018 | #ifdef STATIC_TRANSFORM_NAME |
fc338970 MK |
2019 | /* SunPRO encodes the static variables. This is not related to C++ |
2020 | mangling, it is done for C too. */ | |
c906108c SS |
2021 | |
2022 | char * | |
fba45db2 | 2023 | sunpro_static_transform_name (char *name) |
c906108c SS |
2024 | { |
2025 | char *p; | |
2026 | if (IS_STATIC_TRANSFORM_NAME (name)) | |
2027 | { | |
fc338970 MK |
2028 | /* For file-local statics there will be a period, a bunch of |
2029 | junk (the contents of which match a string given in the | |
c5aa993b JM |
2030 | N_OPT), a period and the name. For function-local statics |
2031 | there will be a bunch of junk (which seems to change the | |
2032 | second character from 'A' to 'B'), a period, the name of the | |
2033 | function, and the name. So just skip everything before the | |
2034 | last period. */ | |
c906108c SS |
2035 | p = strrchr (name, '.'); |
2036 | if (p != NULL) | |
2037 | name = p + 1; | |
2038 | } | |
2039 | return name; | |
2040 | } | |
2041 | #endif /* STATIC_TRANSFORM_NAME */ | |
fc338970 | 2042 | \f |
c906108c | 2043 | |
fc338970 | 2044 | /* Stuff for WIN32 PE style DLL's but is pretty generic really. */ |
c906108c SS |
2045 | |
2046 | CORE_ADDR | |
1cce71eb | 2047 | i386_pe_skip_trampoline_code (CORE_ADDR pc, char *name) |
c906108c | 2048 | { |
fc338970 | 2049 | if (pc && read_memory_unsigned_integer (pc, 2) == 0x25ff) /* jmp *(dest) */ |
c906108c | 2050 | { |
c5aa993b | 2051 | unsigned long indirect = read_memory_unsigned_integer (pc + 2, 4); |
c906108c | 2052 | struct minimal_symbol *indsym = |
fc338970 | 2053 | indirect ? lookup_minimal_symbol_by_pc (indirect) : 0; |
645dd519 | 2054 | char *symname = indsym ? SYMBOL_LINKAGE_NAME (indsym) : 0; |
c906108c | 2055 | |
c5aa993b | 2056 | if (symname) |
c906108c | 2057 | { |
c5aa993b JM |
2058 | if (strncmp (symname, "__imp_", 6) == 0 |
2059 | || strncmp (symname, "_imp_", 5) == 0) | |
c906108c SS |
2060 | return name ? 1 : read_memory_unsigned_integer (indirect, 4); |
2061 | } | |
2062 | } | |
fc338970 | 2063 | return 0; /* Not a trampoline. */ |
c906108c | 2064 | } |
fc338970 MK |
2065 | \f |
2066 | ||
377d9ebd | 2067 | /* Return whether the frame preceding NEXT_FRAME corresponds to a |
911bc6ee | 2068 | sigtramp routine. */ |
8201327c MK |
2069 | |
2070 | static int | |
911bc6ee | 2071 | i386_sigtramp_p (struct frame_info *next_frame) |
8201327c | 2072 | { |
911bc6ee MK |
2073 | CORE_ADDR pc = frame_pc_unwind (next_frame); |
2074 | char *name; | |
2075 | ||
2076 | find_pc_partial_function (pc, &name, NULL, NULL); | |
8201327c MK |
2077 | return (name && strcmp ("_sigtramp", name) == 0); |
2078 | } | |
2079 | \f | |
2080 | ||
fc338970 MK |
2081 | /* We have two flavours of disassembly. The machinery on this page |
2082 | deals with switching between those. */ | |
c906108c SS |
2083 | |
2084 | static int | |
a89aa300 | 2085 | i386_print_insn (bfd_vma pc, struct disassemble_info *info) |
c906108c | 2086 | { |
5e3397bb MK |
2087 | gdb_assert (disassembly_flavor == att_flavor |
2088 | || disassembly_flavor == intel_flavor); | |
2089 | ||
2090 | /* FIXME: kettenis/20020915: Until disassembler_options is properly | |
2091 | constified, cast to prevent a compiler warning. */ | |
2092 | info->disassembler_options = (char *) disassembly_flavor; | |
2093 | info->mach = gdbarch_bfd_arch_info (current_gdbarch)->mach; | |
2094 | ||
2095 | return print_insn_i386 (pc, info); | |
7a292a7a | 2096 | } |
fc338970 | 2097 | \f |
3ce1502b | 2098 | |
8201327c MK |
2099 | /* There are a few i386 architecture variants that differ only |
2100 | slightly from the generic i386 target. For now, we don't give them | |
2101 | their own source file, but include them here. As a consequence, | |
2102 | they'll always be included. */ | |
3ce1502b | 2103 | |
8201327c | 2104 | /* System V Release 4 (SVR4). */ |
3ce1502b | 2105 | |
377d9ebd | 2106 | /* Return whether the frame preceding NEXT_FRAME corresponds to a SVR4 |
911bc6ee MK |
2107 | sigtramp routine. */ |
2108 | ||
8201327c | 2109 | static int |
911bc6ee | 2110 | i386_svr4_sigtramp_p (struct frame_info *next_frame) |
d2a7c97a | 2111 | { |
911bc6ee MK |
2112 | CORE_ADDR pc = frame_pc_unwind (next_frame); |
2113 | char *name; | |
2114 | ||
acd5c798 MK |
2115 | /* UnixWare uses _sigacthandler. The origin of the other symbols is |
2116 | currently unknown. */ | |
911bc6ee | 2117 | find_pc_partial_function (pc, &name, NULL, NULL); |
8201327c MK |
2118 | return (name && (strcmp ("_sigreturn", name) == 0 |
2119 | || strcmp ("_sigacthandler", name) == 0 | |
2120 | || strcmp ("sigvechandler", name) == 0)); | |
2121 | } | |
d2a7c97a | 2122 | |
acd5c798 MK |
2123 | /* Assuming NEXT_FRAME is for a frame following a SVR4 sigtramp |
2124 | routine, return the address of the associated sigcontext (ucontext) | |
2125 | structure. */ | |
3ce1502b | 2126 | |
3a1e71e3 | 2127 | static CORE_ADDR |
acd5c798 | 2128 | i386_svr4_sigcontext_addr (struct frame_info *next_frame) |
8201327c | 2129 | { |
63c0089f | 2130 | gdb_byte buf[4]; |
acd5c798 | 2131 | CORE_ADDR sp; |
3ce1502b | 2132 | |
acd5c798 MK |
2133 | frame_unwind_register (next_frame, I386_ESP_REGNUM, buf); |
2134 | sp = extract_unsigned_integer (buf, 4); | |
21d0e8a4 | 2135 | |
acd5c798 | 2136 | return read_memory_unsigned_integer (sp + 8, 4); |
8201327c MK |
2137 | } |
2138 | \f | |
3ce1502b | 2139 | |
8201327c | 2140 | /* Generic ELF. */ |
d2a7c97a | 2141 | |
8201327c MK |
2142 | void |
2143 | i386_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
2144 | { | |
c4fc7f1b MK |
2145 | /* We typically use stabs-in-ELF with the SVR4 register numbering. */ |
2146 | set_gdbarch_stab_reg_to_regnum (gdbarch, i386_svr4_reg_to_regnum); | |
8201327c | 2147 | } |
3ce1502b | 2148 | |
8201327c | 2149 | /* System V Release 4 (SVR4). */ |
3ce1502b | 2150 | |
8201327c MK |
2151 | void |
2152 | i386_svr4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
2153 | { | |
2154 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3ce1502b | 2155 | |
8201327c MK |
2156 | /* System V Release 4 uses ELF. */ |
2157 | i386_elf_init_abi (info, gdbarch); | |
3ce1502b | 2158 | |
dfe01d39 | 2159 | /* System V Release 4 has shared libraries. */ |
dfe01d39 MK |
2160 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
2161 | ||
911bc6ee | 2162 | tdep->sigtramp_p = i386_svr4_sigtramp_p; |
21d0e8a4 | 2163 | tdep->sigcontext_addr = i386_svr4_sigcontext_addr; |
acd5c798 MK |
2164 | tdep->sc_pc_offset = 36 + 14 * 4; |
2165 | tdep->sc_sp_offset = 36 + 17 * 4; | |
3ce1502b | 2166 | |
8201327c | 2167 | tdep->jb_pc_offset = 20; |
3ce1502b MK |
2168 | } |
2169 | ||
8201327c | 2170 | /* DJGPP. */ |
3ce1502b | 2171 | |
3a1e71e3 | 2172 | static void |
8201327c | 2173 | i386_go32_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
3ce1502b | 2174 | { |
8201327c | 2175 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
3ce1502b | 2176 | |
911bc6ee MK |
2177 | /* DJGPP doesn't have any special frames for signal handlers. */ |
2178 | tdep->sigtramp_p = NULL; | |
3ce1502b | 2179 | |
8201327c | 2180 | tdep->jb_pc_offset = 36; |
3ce1502b MK |
2181 | } |
2182 | ||
8201327c | 2183 | /* NetWare. */ |
3ce1502b | 2184 | |
3a1e71e3 | 2185 | static void |
8201327c | 2186 | i386_nw_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
3ce1502b | 2187 | { |
8201327c | 2188 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
3ce1502b | 2189 | |
8201327c | 2190 | tdep->jb_pc_offset = 24; |
d2a7c97a | 2191 | } |
8201327c | 2192 | \f |
2acceee2 | 2193 | |
38c968cf AC |
2194 | /* i386 register groups. In addition to the normal groups, add "mmx" |
2195 | and "sse". */ | |
2196 | ||
2197 | static struct reggroup *i386_sse_reggroup; | |
2198 | static struct reggroup *i386_mmx_reggroup; | |
2199 | ||
2200 | static void | |
2201 | i386_init_reggroups (void) | |
2202 | { | |
2203 | i386_sse_reggroup = reggroup_new ("sse", USER_REGGROUP); | |
2204 | i386_mmx_reggroup = reggroup_new ("mmx", USER_REGGROUP); | |
2205 | } | |
2206 | ||
2207 | static void | |
2208 | i386_add_reggroups (struct gdbarch *gdbarch) | |
2209 | { | |
2210 | reggroup_add (gdbarch, i386_sse_reggroup); | |
2211 | reggroup_add (gdbarch, i386_mmx_reggroup); | |
2212 | reggroup_add (gdbarch, general_reggroup); | |
2213 | reggroup_add (gdbarch, float_reggroup); | |
2214 | reggroup_add (gdbarch, all_reggroup); | |
2215 | reggroup_add (gdbarch, save_reggroup); | |
2216 | reggroup_add (gdbarch, restore_reggroup); | |
2217 | reggroup_add (gdbarch, vector_reggroup); | |
2218 | reggroup_add (gdbarch, system_reggroup); | |
2219 | } | |
2220 | ||
2221 | int | |
2222 | i386_register_reggroup_p (struct gdbarch *gdbarch, int regnum, | |
2223 | struct reggroup *group) | |
2224 | { | |
5716833c MK |
2225 | int sse_regnum_p = (i386_sse_regnum_p (gdbarch, regnum) |
2226 | || i386_mxcsr_regnum_p (gdbarch, regnum)); | |
38c968cf AC |
2227 | int fp_regnum_p = (i386_fp_regnum_p (regnum) |
2228 | || i386_fpc_regnum_p (regnum)); | |
5716833c | 2229 | int mmx_regnum_p = (i386_mmx_regnum_p (gdbarch, regnum)); |
acd5c798 | 2230 | |
38c968cf AC |
2231 | if (group == i386_mmx_reggroup) |
2232 | return mmx_regnum_p; | |
2233 | if (group == i386_sse_reggroup) | |
2234 | return sse_regnum_p; | |
2235 | if (group == vector_reggroup) | |
2236 | return (mmx_regnum_p || sse_regnum_p); | |
2237 | if (group == float_reggroup) | |
2238 | return fp_regnum_p; | |
2239 | if (group == general_reggroup) | |
2240 | return (!fp_regnum_p && !mmx_regnum_p && !sse_regnum_p); | |
acd5c798 | 2241 | |
38c968cf AC |
2242 | return default_register_reggroup_p (gdbarch, regnum, group); |
2243 | } | |
38c968cf | 2244 | \f |
acd5c798 | 2245 | |
f837910f MK |
2246 | /* Get the ARGIth function argument for the current function. */ |
2247 | ||
42c466d7 | 2248 | static CORE_ADDR |
143985b7 AF |
2249 | i386_fetch_pointer_argument (struct frame_info *frame, int argi, |
2250 | struct type *type) | |
2251 | { | |
f837910f MK |
2252 | CORE_ADDR sp = get_frame_register_unsigned (frame, I386_ESP_REGNUM); |
2253 | return read_memory_unsigned_integer (sp + (4 * (argi + 1)), 4); | |
143985b7 AF |
2254 | } |
2255 | ||
2256 | \f | |
3a1e71e3 | 2257 | static struct gdbarch * |
a62cc96e AC |
2258 | i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
2259 | { | |
cd3c07fc | 2260 | struct gdbarch_tdep *tdep; |
a62cc96e AC |
2261 | struct gdbarch *gdbarch; |
2262 | ||
4be87837 DJ |
2263 | /* If there is already a candidate, use it. */ |
2264 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
2265 | if (arches != NULL) | |
2266 | return arches->gdbarch; | |
a62cc96e AC |
2267 | |
2268 | /* Allocate space for the new architecture. */ | |
2269 | tdep = XMALLOC (struct gdbarch_tdep); | |
2270 | gdbarch = gdbarch_alloc (&info, tdep); | |
2271 | ||
473f17b0 MK |
2272 | /* General-purpose registers. */ |
2273 | tdep->gregset = NULL; | |
2274 | tdep->gregset_reg_offset = NULL; | |
2275 | tdep->gregset_num_regs = I386_NUM_GREGS; | |
2276 | tdep->sizeof_gregset = 0; | |
2277 | ||
2278 | /* Floating-point registers. */ | |
2279 | tdep->fpregset = NULL; | |
2280 | tdep->sizeof_fpregset = I387_SIZEOF_FSAVE; | |
2281 | ||
5716833c | 2282 | /* The default settings include the FPU registers, the MMX registers |
fd35795f | 2283 | and the SSE registers. This can be overridden for a specific ABI |
5716833c MK |
2284 | by adjusting the members `st0_regnum', `mm0_regnum' and |
2285 | `num_xmm_regs' of `struct gdbarch_tdep', otherwise the registers | |
2286 | will show up in the output of "info all-registers". Ideally we | |
2287 | should try to autodetect whether they are available, such that we | |
2288 | can prevent "info all-registers" from displaying registers that | |
2289 | aren't available. | |
2290 | ||
2291 | NOTE: kevinb/2003-07-13: ... if it's a choice between printing | |
2292 | [the SSE registers] always (even when they don't exist) or never | |
2293 | showing them to the user (even when they do exist), I prefer the | |
2294 | former over the latter. */ | |
2295 | ||
2296 | tdep->st0_regnum = I386_ST0_REGNUM; | |
2297 | ||
2298 | /* The MMX registers are implemented as pseudo-registers. Put off | |
fd35795f | 2299 | calculating the register number for %mm0 until we know the number |
5716833c MK |
2300 | of raw registers. */ |
2301 | tdep->mm0_regnum = 0; | |
2302 | ||
2303 | /* I386_NUM_XREGS includes %mxcsr, so substract one. */ | |
49ed40de | 2304 | tdep->num_xmm_regs = I386_NUM_XREGS - 1; |
d2a7c97a | 2305 | |
8201327c MK |
2306 | tdep->jb_pc_offset = -1; |
2307 | tdep->struct_return = pcc_struct_return; | |
8201327c MK |
2308 | tdep->sigtramp_start = 0; |
2309 | tdep->sigtramp_end = 0; | |
911bc6ee | 2310 | tdep->sigtramp_p = i386_sigtramp_p; |
21d0e8a4 | 2311 | tdep->sigcontext_addr = NULL; |
a3386186 | 2312 | tdep->sc_reg_offset = NULL; |
8201327c | 2313 | tdep->sc_pc_offset = -1; |
21d0e8a4 | 2314 | tdep->sc_sp_offset = -1; |
8201327c | 2315 | |
896fb97d MK |
2316 | /* The format used for `long double' on almost all i386 targets is |
2317 | the i387 extended floating-point format. In fact, of all targets | |
2318 | in the GCC 2.95 tree, only OSF/1 does it different, and insists | |
2319 | on having a `long double' that's not `long' at all. */ | |
2320 | set_gdbarch_long_double_format (gdbarch, &floatformat_i387_ext); | |
21d0e8a4 | 2321 | |
66da5fd8 | 2322 | /* Although the i387 extended floating-point has only 80 significant |
896fb97d MK |
2323 | bits, a `long double' actually takes up 96, probably to enforce |
2324 | alignment. */ | |
2325 | set_gdbarch_long_double_bit (gdbarch, 96); | |
2326 | ||
49ed40de KB |
2327 | /* The default ABI includes general-purpose registers, |
2328 | floating-point registers, and the SSE registers. */ | |
2329 | set_gdbarch_num_regs (gdbarch, I386_SSE_NUM_REGS); | |
acd5c798 MK |
2330 | set_gdbarch_register_name (gdbarch, i386_register_name); |
2331 | set_gdbarch_register_type (gdbarch, i386_register_type); | |
21d0e8a4 | 2332 | |
acd5c798 MK |
2333 | /* Register numbers of various important registers. */ |
2334 | set_gdbarch_sp_regnum (gdbarch, I386_ESP_REGNUM); /* %esp */ | |
2335 | set_gdbarch_pc_regnum (gdbarch, I386_EIP_REGNUM); /* %eip */ | |
2336 | set_gdbarch_ps_regnum (gdbarch, I386_EFLAGS_REGNUM); /* %eflags */ | |
2337 | set_gdbarch_fp0_regnum (gdbarch, I386_ST0_REGNUM); /* %st(0) */ | |
356a6b3e | 2338 | |
c4fc7f1b MK |
2339 | /* NOTE: kettenis/20040418: GCC does have two possible register |
2340 | numbering schemes on the i386: dbx and SVR4. These schemes | |
2341 | differ in how they number %ebp, %esp, %eflags, and the | |
fd35795f | 2342 | floating-point registers, and are implemented by the arrays |
c4fc7f1b MK |
2343 | dbx_register_map[] and svr4_dbx_register_map in |
2344 | gcc/config/i386.c. GCC also defines a third numbering scheme in | |
2345 | gcc/config/i386.c, which it designates as the "default" register | |
2346 | map used in 64bit mode. This last register numbering scheme is | |
d4dc1a91 | 2347 | implemented in dbx64_register_map, and is used for AMD64; see |
c4fc7f1b MK |
2348 | amd64-tdep.c. |
2349 | ||
2350 | Currently, each GCC i386 target always uses the same register | |
2351 | numbering scheme across all its supported debugging formats | |
2352 | i.e. SDB (COFF), stabs and DWARF 2. This is because | |
2353 | gcc/sdbout.c, gcc/dbxout.c and gcc/dwarf2out.c all use the | |
2354 | DBX_REGISTER_NUMBER macro which is defined by each target's | |
2355 | respective config header in a manner independent of the requested | |
2356 | output debugging format. | |
2357 | ||
2358 | This does not match the arrangement below, which presumes that | |
2359 | the SDB and stabs numbering schemes differ from the DWARF and | |
2360 | DWARF 2 ones. The reason for this arrangement is that it is | |
2361 | likely to get the numbering scheme for the target's | |
2362 | default/native debug format right. For targets where GCC is the | |
2363 | native compiler (FreeBSD, NetBSD, OpenBSD, GNU/Linux) or for | |
2364 | targets where the native toolchain uses a different numbering | |
2365 | scheme for a particular debug format (stabs-in-ELF on Solaris) | |
d4dc1a91 BF |
2366 | the defaults below will have to be overridden, like |
2367 | i386_elf_init_abi() does. */ | |
c4fc7f1b MK |
2368 | |
2369 | /* Use the dbx register numbering scheme for stabs and COFF. */ | |
2370 | set_gdbarch_stab_reg_to_regnum (gdbarch, i386_dbx_reg_to_regnum); | |
2371 | set_gdbarch_sdb_reg_to_regnum (gdbarch, i386_dbx_reg_to_regnum); | |
2372 | ||
2373 | /* Use the SVR4 register numbering scheme for DWARF and DWARF 2. */ | |
2374 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, i386_svr4_reg_to_regnum); | |
2375 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, i386_svr4_reg_to_regnum); | |
356a6b3e MK |
2376 | |
2377 | /* We don't define ECOFF_REG_TO_REGNUM, since ECOFF doesn't seem to | |
2378 | be in use on any of the supported i386 targets. */ | |
2379 | ||
61113f8b MK |
2380 | set_gdbarch_print_float_info (gdbarch, i387_print_float_info); |
2381 | ||
8201327c | 2382 | set_gdbarch_get_longjmp_target (gdbarch, i386_get_longjmp_target); |
96297dab | 2383 | |
a62cc96e | 2384 | /* Call dummy code. */ |
acd5c798 | 2385 | set_gdbarch_push_dummy_call (gdbarch, i386_push_dummy_call); |
a62cc96e | 2386 | |
ff2e87ac AC |
2387 | set_gdbarch_convert_register_p (gdbarch, i386_convert_register_p); |
2388 | set_gdbarch_register_to_value (gdbarch, i386_register_to_value); | |
2389 | set_gdbarch_value_to_register (gdbarch, i386_value_to_register); | |
b6197528 | 2390 | |
c5e656c1 | 2391 | set_gdbarch_return_value (gdbarch, i386_return_value); |
8201327c | 2392 | |
93924b6b MK |
2393 | set_gdbarch_skip_prologue (gdbarch, i386_skip_prologue); |
2394 | ||
2395 | /* Stack grows downward. */ | |
2396 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
2397 | ||
2398 | set_gdbarch_breakpoint_from_pc (gdbarch, i386_breakpoint_from_pc); | |
2399 | set_gdbarch_decr_pc_after_break (gdbarch, 1); | |
42fdc8df | 2400 | |
42fdc8df | 2401 | set_gdbarch_frame_args_skip (gdbarch, 8); |
8201327c | 2402 | |
28fc6740 | 2403 | /* Wire in the MMX registers. */ |
0f751ff2 | 2404 | set_gdbarch_num_pseudo_regs (gdbarch, i386_num_mmx_regs); |
28fc6740 AC |
2405 | set_gdbarch_pseudo_register_read (gdbarch, i386_pseudo_register_read); |
2406 | set_gdbarch_pseudo_register_write (gdbarch, i386_pseudo_register_write); | |
2407 | ||
5e3397bb MK |
2408 | set_gdbarch_print_insn (gdbarch, i386_print_insn); |
2409 | ||
acd5c798 | 2410 | set_gdbarch_unwind_dummy_id (gdbarch, i386_unwind_dummy_id); |
acd5c798 MK |
2411 | |
2412 | set_gdbarch_unwind_pc (gdbarch, i386_unwind_pc); | |
2413 | ||
38c968cf AC |
2414 | /* Add the i386 register groups. */ |
2415 | i386_add_reggroups (gdbarch); | |
2416 | set_gdbarch_register_reggroup_p (gdbarch, i386_register_reggroup_p); | |
2417 | ||
143985b7 AF |
2418 | /* Helper for function argument information. */ |
2419 | set_gdbarch_fetch_pointer_argument (gdbarch, i386_fetch_pointer_argument); | |
2420 | ||
6405b0a6 | 2421 | /* Hook in the DWARF CFI frame unwinder. */ |
336d1bba | 2422 | frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); |
6405b0a6 | 2423 | |
acd5c798 | 2424 | frame_base_set_default (gdbarch, &i386_frame_base); |
6c0e89ed | 2425 | |
3ce1502b | 2426 | /* Hook in ABI-specific overrides, if they have been registered. */ |
4be87837 | 2427 | gdbarch_init_osabi (info, gdbarch); |
3ce1502b | 2428 | |
336d1bba AC |
2429 | frame_unwind_append_sniffer (gdbarch, i386_sigtramp_frame_sniffer); |
2430 | frame_unwind_append_sniffer (gdbarch, i386_frame_sniffer); | |
acd5c798 | 2431 | |
8446b36a MK |
2432 | /* If we have a register mapping, enable the generic core file |
2433 | support, unless it has already been enabled. */ | |
2434 | if (tdep->gregset_reg_offset | |
2435 | && !gdbarch_regset_from_core_section_p (gdbarch)) | |
2436 | set_gdbarch_regset_from_core_section (gdbarch, | |
2437 | i386_regset_from_core_section); | |
2438 | ||
5716833c MK |
2439 | /* Unless support for MMX has been disabled, make %mm0 the first |
2440 | pseudo-register. */ | |
2441 | if (tdep->mm0_regnum == 0) | |
2442 | tdep->mm0_regnum = gdbarch_num_regs (gdbarch); | |
2443 | ||
a62cc96e AC |
2444 | return gdbarch; |
2445 | } | |
2446 | ||
8201327c MK |
2447 | static enum gdb_osabi |
2448 | i386_coff_osabi_sniffer (bfd *abfd) | |
2449 | { | |
762c5349 MK |
2450 | if (strcmp (bfd_get_target (abfd), "coff-go32-exe") == 0 |
2451 | || strcmp (bfd_get_target (abfd), "coff-go32") == 0) | |
8201327c MK |
2452 | return GDB_OSABI_GO32; |
2453 | ||
2454 | return GDB_OSABI_UNKNOWN; | |
2455 | } | |
2456 | ||
2457 | static enum gdb_osabi | |
2458 | i386_nlm_osabi_sniffer (bfd *abfd) | |
2459 | { | |
2460 | return GDB_OSABI_NETWARE; | |
2461 | } | |
2462 | \f | |
2463 | ||
28e9e0f0 MK |
2464 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
2465 | void _initialize_i386_tdep (void); | |
2466 | ||
c906108c | 2467 | void |
fba45db2 | 2468 | _initialize_i386_tdep (void) |
c906108c | 2469 | { |
a62cc96e AC |
2470 | register_gdbarch_init (bfd_arch_i386, i386_gdbarch_init); |
2471 | ||
fc338970 | 2472 | /* Add the variable that controls the disassembly flavor. */ |
7ab04401 AC |
2473 | add_setshow_enum_cmd ("disassembly-flavor", no_class, valid_flavors, |
2474 | &disassembly_flavor, _("\ | |
2475 | Set the disassembly flavor."), _("\ | |
2476 | Show the disassembly flavor."), _("\ | |
2477 | The valid values are \"att\" and \"intel\", and the default value is \"att\"."), | |
2478 | NULL, | |
2479 | NULL, /* FIXME: i18n: */ | |
2480 | &setlist, &showlist); | |
8201327c MK |
2481 | |
2482 | /* Add the variable that controls the convention for returning | |
2483 | structs. */ | |
7ab04401 AC |
2484 | add_setshow_enum_cmd ("struct-convention", no_class, valid_conventions, |
2485 | &struct_convention, _("\ | |
2486 | Set the convention for returning small structs."), _("\ | |
2487 | Show the convention for returning small structs."), _("\ | |
2488 | Valid values are \"default\", \"pcc\" and \"reg\", and the default value\n\ | |
2489 | is \"default\"."), | |
2490 | NULL, | |
2491 | NULL, /* FIXME: i18n: */ | |
2492 | &setlist, &showlist); | |
8201327c MK |
2493 | |
2494 | gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour, | |
2495 | i386_coff_osabi_sniffer); | |
2496 | gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_nlm_flavour, | |
2497 | i386_nlm_osabi_sniffer); | |
2498 | ||
05816f70 | 2499 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_SVR4, |
8201327c | 2500 | i386_svr4_init_abi); |
05816f70 | 2501 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_GO32, |
8201327c | 2502 | i386_go32_init_abi); |
05816f70 | 2503 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETWARE, |
8201327c | 2504 | i386_nw_init_abi); |
38c968cf | 2505 | |
5ae96ec1 | 2506 | /* Initialize the i386-specific register groups & types. */ |
38c968cf | 2507 | i386_init_reggroups (); |
5ae96ec1 | 2508 | i386_init_types(); |
c906108c | 2509 | } |