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53e95fcf JS |
1 | /* Target-dependent code for the x86-64 for GDB, the GNU debugger. |
2 | Copyright 2001 | |
3 | Free Software Foundation, Inc. | |
4 | Contributed by Jiri Smid, SuSE Labs. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
22 | ||
23 | #include "defs.h" | |
24 | #include "inferior.h" | |
25 | #include "gdbcore.h" | |
26 | #include "gdbcmd.h" | |
27 | #include "arch-utils.h" | |
28 | #include "regcache.h" | |
29 | #include "symfile.h" | |
30 | #include "x86-64-tdep.h" | |
31 | #include "dwarf2cfi.h" | |
32 | ||
33 | ||
34 | /* Register numbers of various important registers. */ | |
35 | #define RAX_REGNUM 0 | |
36 | #define RDX_REGNUM 1 | |
37 | #define RDI_REGNUM 5 | |
38 | #define EFLAGS_REGNUM 17 | |
39 | #define XMM1_REGNUM 35 | |
40 | ||
41 | /* x86_64_register_raw_size_table[i] is the number of bytes of storage in | |
42 | GDB's register array occupied by register i. */ | |
43 | int x86_64_register_raw_size_table[X86_64_NUM_REGS] = { | |
44 | 8, 8, 8, 8, | |
45 | 8, 8, 8, 8, | |
46 | 8, 8, 8, 8, | |
47 | 8, 8, 8, 8, | |
48 | 8, 4, | |
49 | 10, 10, 10, 10, | |
50 | 10, 10, 10, 10, | |
51 | 4, 4, 4, 4, | |
52 | 4, 4, 4, 4, | |
53 | 16, 16, 16, 16, | |
54 | 16, 16, 16, 16, | |
55 | 16, 16, 16, 16, | |
56 | 16, 16, 16, 16, | |
57 | 4 | |
58 | }; | |
59 | ||
60 | /* Number of bytes of storage in the actual machine representation for | |
61 | register REGNO. */ | |
62 | int | |
63 | x86_64_register_raw_size (int regno) | |
64 | { | |
65 | return x86_64_register_raw_size_table[regno]; | |
66 | } | |
67 | ||
68 | /* x86_64_register_byte_table[i] is the offset into the register file of the | |
69 | start of register number i. We initialize this from | |
70 | x86_64_register_raw_size_table. */ | |
71 | int x86_64_register_byte_table[X86_64_NUM_REGS]; | |
72 | ||
73 | /* Index within `registers' of the first byte of the space for register REGNO. */ | |
74 | int | |
75 | x86_64_register_byte (int regno) | |
76 | { | |
77 | return x86_64_register_byte_table[regno]; | |
78 | } | |
79 | ||
80 | /* Return the GDB type object for the "standard" data type of data in | |
81 | register N. */ | |
82 | static struct type * | |
83 | x86_64_register_virtual_type (int regno) | |
84 | { | |
85 | if (regno == PC_REGNUM || regno == SP_REGNUM) | |
86 | return lookup_pointer_type (builtin_type_void); | |
87 | if (IS_FP_REGNUM (regno)) | |
88 | return builtin_type_long_double; | |
89 | if (IS_SSE_REGNUM (regno)) | |
90 | return builtin_type_v4sf; | |
91 | if (IS_FPU_CTRL_REGNUM (regno) || regno == MXCSR_REGNUM | |
92 | || regno == EFLAGS_REGNUM) | |
93 | return builtin_type_int; | |
94 | return builtin_type_long; | |
95 | } | |
96 | ||
97 | /* Number of bytes of storage in the program's representation | |
98 | for register REGNO. */ | |
99 | int | |
100 | x86_64_register_virtual_size (int regno) | |
101 | { | |
102 | return (TYPE_LENGTH (x86_64_register_virtual_type (regno))); | |
103 | } | |
104 | ||
105 | /* x86_64_register_convertible is true if register N's virtual format is | |
106 | different from its raw format. Note that this definition assumes | |
107 | that the host supports IEEE 32-bit floats, since it doesn't say | |
108 | that SSE registers need conversion. Even if we can't find a | |
109 | counterexample, this is still sloppy. */ | |
110 | int | |
111 | x86_64_register_convertible (int regno) | |
112 | { | |
113 | return IS_FP_REGNUM (regno); | |
114 | } | |
115 | ||
116 | /* Convert data from raw format for register REGNUM in buffer FROM to | |
117 | virtual format with type TYPE in buffer TO. In principle both | |
118 | formats are identical except that the virtual format has two extra | |
119 | bytes appended that aren't used. We set these to zero. */ | |
120 | void | |
121 | x86_64_register_convert_to_virtual (int regnum, struct type *type, | |
122 | char *from, char *to) | |
123 | { | |
124 | /* Copy straight over, but take care of the padding. */ | |
125 | memcpy (to, from, FPU_REG_RAW_SIZE); | |
126 | memset (to + FPU_REG_RAW_SIZE, 0, TYPE_LENGTH (type) - FPU_REG_RAW_SIZE); | |
127 | } | |
128 | ||
129 | /* Convert data from virtual format with type TYPE in buffer FROM to | |
130 | raw format for register REGNUM in buffer TO. Simply omit the two | |
131 | unused bytes. */ | |
132 | ||
133 | void | |
134 | x86_64_register_convert_to_raw (struct type *type, int regnum, | |
135 | char *from, char *to) | |
136 | { | |
137 | memcpy (to, from, FPU_REG_RAW_SIZE); | |
138 | } | |
139 | \f | |
140 | ||
141 | /* This is the variable that is set with "set disassembly-flavour", and | |
142 | its legitimate values. */ | |
143 | static const char att_flavour[] = "att"; | |
144 | static const char intel_flavour[] = "intel"; | |
145 | static const char *valid_flavours[] = { | |
146 | att_flavour, | |
147 | intel_flavour, | |
148 | NULL | |
149 | }; | |
150 | static const char *disassembly_flavour = att_flavour; | |
151 | ||
152 | static CORE_ADDR | |
153 | x86_64_push_return_address (CORE_ADDR pc, CORE_ADDR sp) | |
154 | { | |
155 | char buf[8]; | |
156 | ||
157 | store_unsigned_integer (buf, 8, CALL_DUMMY_ADDRESS ()); | |
158 | ||
159 | write_memory (sp - 8, buf, 8); | |
160 | return sp - 8; | |
161 | } | |
162 | ||
163 | void | |
164 | x86_64_pop_frame (void) | |
165 | { | |
166 | generic_pop_current_frame (cfi_pop_frame); | |
167 | } | |
168 | \f | |
169 | ||
170 | /* The returning of values is done according to the special algorithm. | |
171 | Some types are returned in registers an some (big structures) in memory. | |
172 | See ABI for details. | |
173 | */ | |
174 | ||
175 | #define MAX_CLASSES 4 | |
176 | ||
177 | enum x86_64_reg_class | |
178 | { | |
179 | X86_64_NO_CLASS, | |
180 | X86_64_INTEGER_CLASS, | |
181 | X86_64_INTEGERSI_CLASS, | |
182 | X86_64_SSE_CLASS, | |
183 | X86_64_SSESF_CLASS, | |
184 | X86_64_SSEDF_CLASS, | |
185 | X86_64_SSEUP_CLASS, | |
186 | X86_64_X87_CLASS, | |
187 | X86_64_X87UP_CLASS, | |
188 | X86_64_MEMORY_CLASS | |
189 | }; | |
190 | ||
191 | /* Return the union class of CLASS1 and CLASS2. | |
192 | See the x86-64 ABI for details. */ | |
193 | ||
194 | static enum x86_64_reg_class | |
195 | merge_classes (enum x86_64_reg_class class1, enum x86_64_reg_class class2) | |
196 | { | |
197 | /* Rule #1: If both classes are equal, this is the resulting class. */ | |
198 | if (class1 == class2) | |
199 | return class1; | |
200 | ||
201 | /* Rule #2: If one of the classes is NO_CLASS, the resulting class is | |
202 | the other class. */ | |
203 | if (class1 == X86_64_NO_CLASS) | |
204 | return class2; | |
205 | if (class2 == X86_64_NO_CLASS) | |
206 | return class1; | |
207 | ||
208 | /* Rule #3: If one of the classes is MEMORY, the result is MEMORY. */ | |
209 | if (class1 == X86_64_MEMORY_CLASS || class2 == X86_64_MEMORY_CLASS) | |
210 | return X86_64_MEMORY_CLASS; | |
211 | ||
212 | /* Rule #4: If one of the classes is INTEGER, the result is INTEGER. */ | |
213 | if ((class1 == X86_64_INTEGERSI_CLASS && class2 == X86_64_SSESF_CLASS) | |
214 | || (class2 == X86_64_INTEGERSI_CLASS && class1 == X86_64_SSESF_CLASS)) | |
215 | return X86_64_INTEGERSI_CLASS; | |
216 | if (class1 == X86_64_INTEGER_CLASS || class1 == X86_64_INTEGERSI_CLASS | |
217 | || class2 == X86_64_INTEGER_CLASS || class2 == X86_64_INTEGERSI_CLASS) | |
218 | return X86_64_INTEGER_CLASS; | |
219 | ||
220 | /* Rule #5: If one of the classes is X87 or X87UP class, MEMORY is used. */ | |
221 | if (class1 == X86_64_X87_CLASS || class1 == X86_64_X87UP_CLASS | |
222 | || class2 == X86_64_X87_CLASS || class2 == X86_64_X87UP_CLASS) | |
223 | return X86_64_MEMORY_CLASS; | |
224 | ||
225 | /* Rule #6: Otherwise class SSE is used. */ | |
226 | return X86_64_SSE_CLASS; | |
227 | } | |
228 | ||
229 | ||
230 | /* Classify the argument type. | |
231 | CLASSES will be filled by the register class used to pass each word | |
232 | of the operand. The number of words is returned. In case the parameter | |
233 | should be passed in memory, 0 is returned. As a special case for zero | |
234 | sized containers, classes[0] will be NO_CLASS and 1 is returned. | |
235 | ||
236 | See the x86-64 PS ABI for details. | |
237 | */ | |
238 | ||
239 | static int | |
240 | classify_argument (struct type *type, | |
241 | enum x86_64_reg_class classes[MAX_CLASSES], int bit_offset) | |
242 | { | |
243 | int bytes = TYPE_LENGTH (type); | |
244 | int words = (bytes + 8 - 1) / 8; | |
245 | ||
246 | switch (TYPE_CODE (type)) | |
247 | { | |
248 | case TYPE_CODE_ARRAY: | |
249 | case TYPE_CODE_STRUCT: | |
250 | case TYPE_CODE_UNION: | |
251 | { | |
252 | int i; | |
253 | enum x86_64_reg_class subclasses[MAX_CLASSES]; | |
254 | ||
255 | /* On x86-64 we pass structures larger than 16 bytes on the stack. */ | |
256 | if (bytes > 16) | |
257 | return 0; | |
258 | ||
259 | for (i = 0; i < words; i++) | |
260 | classes[i] = X86_64_NO_CLASS; | |
261 | ||
262 | /* Zero sized arrays or structures are NO_CLASS. We return 0 to | |
263 | signalize memory class, so handle it as special case. */ | |
264 | if (!words) | |
265 | { | |
266 | classes[0] = X86_64_NO_CLASS; | |
267 | return 1; | |
268 | } | |
269 | switch (TYPE_CODE (type)) | |
270 | { | |
271 | case TYPE_CODE_STRUCT: | |
272 | { | |
273 | int j; | |
274 | for (j = 0; j < type->nfields; ++j) | |
275 | { | |
276 | int num = classify_argument (type->fields[j].type, | |
277 | subclasses, | |
278 | (type->fields[j].loc.bitpos | |
279 | + bit_offset) % 256); | |
280 | if (!num) | |
281 | return 0; | |
282 | for (i = 0; i < num; i++) | |
283 | { | |
284 | int pos = | |
285 | (type->fields[j].loc.bitpos + bit_offset) / 8 / 8; | |
286 | classes[i + pos] = | |
287 | merge_classes (subclasses[i], classes[i + pos]); | |
288 | } | |
289 | } | |
290 | } | |
291 | break; | |
292 | case TYPE_CODE_ARRAY: | |
293 | { | |
294 | int num; | |
295 | ||
296 | num = classify_argument (type->target_type, | |
297 | subclasses, bit_offset); | |
298 | if (!num) | |
299 | return 0; | |
300 | ||
301 | /* The partial classes are now full classes. */ | |
302 | if (subclasses[0] == X86_64_SSESF_CLASS && bytes != 4) | |
303 | subclasses[0] = X86_64_SSE_CLASS; | |
304 | if (subclasses[0] == X86_64_INTEGERSI_CLASS && bytes != 4) | |
305 | subclasses[0] = X86_64_INTEGER_CLASS; | |
306 | ||
307 | for (i = 0; i < words; i++) | |
308 | classes[i] = subclasses[i % num]; | |
309 | } | |
310 | break; | |
311 | case TYPE_CODE_UNION: | |
312 | { | |
313 | int j; | |
314 | { | |
315 | for (j = 0; j < type->nfields; ++j) | |
316 | { | |
317 | int num; | |
318 | num = classify_argument (type->fields[j].type, | |
319 | subclasses, bit_offset); | |
320 | if (!num) | |
321 | return 0; | |
322 | for (i = 0; i < num; i++) | |
323 | classes[i] = merge_classes (subclasses[i], classes[i]); | |
324 | } | |
325 | } | |
326 | } | |
327 | break; | |
328 | } | |
329 | /* Final merger cleanup. */ | |
330 | for (i = 0; i < words; i++) | |
331 | { | |
332 | /* If one class is MEMORY, everything should be passed in | |
333 | memory. */ | |
334 | if (classes[i] == X86_64_MEMORY_CLASS) | |
335 | return 0; | |
336 | ||
337 | /* The X86_64_SSEUP_CLASS should be always preceeded by | |
338 | X86_64_SSE_CLASS. */ | |
339 | if (classes[i] == X86_64_SSEUP_CLASS | |
340 | && (i == 0 || classes[i - 1] != X86_64_SSE_CLASS)) | |
341 | classes[i] = X86_64_SSE_CLASS; | |
342 | ||
343 | /* X86_64_X87UP_CLASS should be preceeded by X86_64_X87_CLASS. */ | |
344 | if (classes[i] == X86_64_X87UP_CLASS | |
345 | && (i == 0 || classes[i - 1] != X86_64_X87_CLASS)) | |
346 | classes[i] = X86_64_SSE_CLASS; | |
347 | } | |
348 | return words; | |
349 | } | |
350 | break; | |
351 | case TYPE_CODE_FLT: | |
352 | switch (bytes) | |
353 | { | |
354 | case 4: | |
355 | if (!(bit_offset % 64)) | |
356 | classes[0] = X86_64_SSESF_CLASS; | |
357 | else | |
358 | classes[0] = X86_64_SSE_CLASS; | |
359 | return 1; | |
360 | case 8: | |
361 | classes[0] = X86_64_SSEDF_CLASS; | |
362 | return 1; | |
363 | case 16: | |
364 | classes[0] = X86_64_X87_CLASS; | |
365 | classes[1] = X86_64_X87UP_CLASS; | |
366 | return 2; | |
367 | } | |
368 | break; | |
369 | case TYPE_CODE_INT: | |
370 | case TYPE_CODE_PTR: | |
371 | switch (bytes) | |
372 | { | |
373 | case 1: | |
374 | case 2: | |
375 | case 4: | |
376 | case 8: | |
377 | if (bytes * 8 + bit_offset <= 32) | |
378 | classes[0] = X86_64_INTEGERSI_CLASS; | |
379 | else | |
380 | classes[0] = X86_64_INTEGER_CLASS; | |
381 | return 1; | |
382 | case 16: | |
383 | classes[0] = classes[1] = X86_64_INTEGER_CLASS; | |
384 | return 2; | |
385 | default: | |
386 | break; | |
387 | } | |
388 | case TYPE_CODE_VOID: | |
389 | return 0; | |
390 | } | |
391 | internal_error (__FILE__, __LINE__, "classify_argument: unknown argument type"); | |
392 | } | |
393 | ||
394 | /* Examine the argument and return set number of register required in each | |
395 | class. Return 0 ifif parameter should be passed in memory. */ | |
396 | ||
397 | static int | |
398 | examine_argument (enum x86_64_reg_class classes[MAX_CLASSES], | |
399 | int n, int *int_nregs, int *sse_nregs) | |
400 | { | |
401 | *int_nregs = 0; | |
402 | *sse_nregs = 0; | |
403 | if (!n) | |
404 | return 0; | |
405 | for (n--; n >= 0; n--) | |
406 | switch (classes[n]) | |
407 | { | |
408 | case X86_64_INTEGER_CLASS: | |
409 | case X86_64_INTEGERSI_CLASS: | |
410 | (*int_nregs)++; | |
411 | break; | |
412 | case X86_64_SSE_CLASS: | |
413 | case X86_64_SSESF_CLASS: | |
414 | case X86_64_SSEDF_CLASS: | |
415 | (*sse_nregs)++; | |
416 | break; | |
417 | case X86_64_NO_CLASS: | |
418 | case X86_64_SSEUP_CLASS: | |
419 | case X86_64_X87_CLASS: | |
420 | case X86_64_X87UP_CLASS: | |
421 | break; | |
422 | case X86_64_MEMORY_CLASS: | |
423 | internal_error (__FILE__, __LINE__, "examine_argument: unexpected memory class"); | |
424 | } | |
425 | return 1; | |
426 | } | |
427 | ||
428 | #define RET_INT_REGS 2 | |
429 | #define RET_SSE_REGS 2 | |
430 | ||
431 | /* Check if the structure in value_type is returned in registers or in | |
432 | memory. If this function returns 1, gdb will call STORE_STRUCT_RETURN and | |
433 | EXTRACT_STRUCT_VALUE_ADDRESS else STORE_RETURN_VALUE and EXTRACT_RETURN_VALUE | |
434 | will be used. */ | |
435 | int | |
436 | x86_64_use_struct_convention (int gcc_p, struct type *value_type) | |
437 | { | |
438 | enum x86_64_reg_class class[MAX_CLASSES]; | |
439 | int n = classify_argument (value_type, class, 0); | |
440 | int needed_intregs; | |
441 | int needed_sseregs; | |
442 | ||
443 | return (!n || | |
444 | !examine_argument (class, n, &needed_intregs, &needed_sseregs) || | |
445 | needed_intregs > RET_INT_REGS || needed_sseregs > RET_SSE_REGS); | |
446 | } | |
447 | ||
448 | ||
449 | /* Extract from an array REGBUF containing the (raw) register state, a | |
450 | function return value of TYPE, and copy that, in virtual format, | |
451 | into VALBUF. */ | |
452 | ||
453 | void | |
454 | x86_64_extract_return_value (struct type *type, char *regbuf, char *valbuf) | |
455 | { | |
456 | enum x86_64_reg_class class[MAX_CLASSES]; | |
457 | int n = classify_argument (type, class, 0); | |
458 | int needed_intregs; | |
459 | int needed_sseregs; | |
460 | int intreg = 0; | |
461 | int ssereg = 0; | |
462 | int offset = 0; | |
463 | int ret_int_r[RET_INT_REGS] = { RAX_REGNUM, RDX_REGNUM }; | |
464 | int ret_sse_r[RET_SSE_REGS] = { XMM0_REGNUM, XMM1_REGNUM }; | |
465 | ||
466 | if (!n || | |
467 | !examine_argument (class, n, &needed_intregs, &needed_sseregs) || | |
468 | needed_intregs > RET_INT_REGS || needed_sseregs > RET_SSE_REGS) | |
469 | { /* memory class */ | |
470 | CORE_ADDR addr; | |
471 | memcpy (&addr, regbuf, REGISTER_RAW_SIZE (RAX_REGNUM)); | |
472 | read_memory (addr, valbuf, TYPE_LENGTH (type)); | |
473 | return; | |
474 | } | |
475 | else | |
476 | { | |
477 | int i; | |
478 | for (i = 0; i < n; i++) | |
479 | { | |
480 | switch (class[i]) | |
481 | { | |
482 | case X86_64_NO_CLASS: | |
483 | break; | |
484 | case X86_64_INTEGER_CLASS: | |
485 | memcpy (valbuf + offset, | |
486 | regbuf + REGISTER_BYTE (ret_int_r[(intreg + 1) / 2]), | |
487 | 8); | |
488 | offset += 8; | |
489 | intreg += 2; | |
490 | break; | |
491 | case X86_64_INTEGERSI_CLASS: | |
492 | memcpy (valbuf + offset, | |
493 | regbuf + REGISTER_BYTE (ret_int_r[intreg / 2]), 4); | |
494 | offset += 8; | |
495 | intreg++; | |
496 | break; | |
497 | case X86_64_SSEDF_CLASS: | |
498 | case X86_64_SSESF_CLASS: | |
499 | case X86_64_SSE_CLASS: | |
500 | memcpy (valbuf + offset, | |
501 | regbuf + REGISTER_BYTE (ret_sse_r[(ssereg + 1) / 2]), | |
502 | 8); | |
503 | offset += 8; | |
504 | ssereg += 2; | |
505 | break; | |
506 | case X86_64_SSEUP_CLASS: | |
507 | memcpy (valbuf + offset + 8, | |
508 | regbuf + REGISTER_BYTE (ret_sse_r[ssereg / 2]), 8); | |
509 | offset += 8; | |
510 | ssereg++; | |
511 | break; | |
512 | case X86_64_X87_CLASS: | |
513 | memcpy (valbuf + offset, regbuf + REGISTER_BYTE (FP0_REGNUM), | |
514 | 8); | |
515 | offset += 8; | |
516 | break; | |
517 | case X86_64_X87UP_CLASS: | |
518 | memcpy (valbuf + offset, | |
519 | regbuf + REGISTER_BYTE (FP0_REGNUM) + 8, 8); | |
520 | offset += 8; | |
521 | break; | |
522 | case X86_64_MEMORY_CLASS: | |
523 | default: | |
524 | internal_error (__FILE__, __LINE__, | |
525 | "Unexpected argument class"); | |
526 | } | |
527 | } | |
528 | } | |
529 | } | |
530 | ||
531 | /* Handled by unwind informations. */ | |
532 | static void | |
533 | x86_64_frame_init_saved_regs (struct frame_info *fi) | |
534 | { | |
535 | } | |
536 | ||
537 | #define INT_REGS 6 | |
538 | #define SSE_REGS 16 | |
539 | ||
540 | /* Push onto the stack the specified value VALUE. Pad it correctly for | |
541 | it to be an argument to a function. */ | |
542 | ||
543 | static CORE_ADDR | |
544 | value_push (register CORE_ADDR sp, value_ptr arg) | |
545 | { | |
546 | register int len = TYPE_LENGTH (VALUE_ENCLOSING_TYPE (arg)); | |
547 | register int container_len = len; | |
548 | ||
549 | /* How big is the container we're going to put this value in? */ | |
550 | if (PARM_BOUNDARY) | |
551 | container_len = ((len + PARM_BOUNDARY / TARGET_CHAR_BIT - 1) | |
552 | & ~(PARM_BOUNDARY / TARGET_CHAR_BIT - 1)); | |
553 | ||
554 | sp -= container_len; | |
555 | write_memory (sp, VALUE_CONTENTS_ALL (arg), len); | |
556 | ||
557 | return sp; | |
558 | } | |
559 | ||
560 | CORE_ADDR | |
561 | x86_64_push_arguments (int nargs, value_ptr *args, CORE_ADDR sp, | |
562 | int struct_return, CORE_ADDR struct_addr) | |
563 | { | |
564 | int intreg = 0; | |
565 | int ssereg = 0; | |
566 | int i; | |
567 | static int int_parameter_registers[INT_REGS] = {5 /*RDI*/, 4 /*RSI*/, | |
568 | 1 /*RDX*/, 2 /*RCX*/, | |
569 | 8 /*R8 */, 9 /*R9 */}; | |
570 | /* XMM0 - XMM15 */ | |
571 | static int sse_parameter_registers[SSE_REGS] = {34, 35, 36, 37, | |
572 | 38, 39, 40, 41, | |
573 | 42, 43, 44, 45, | |
574 | 46, 47, 48, 49}; | |
575 | for (i = 0; i < nargs; i++) | |
576 | { | |
577 | enum x86_64_reg_class class[MAX_CLASSES]; | |
578 | int n = classify_argument (args[i]->type, class, 0); | |
579 | int needed_intregs; | |
580 | int needed_sseregs; | |
581 | ||
582 | if (!n || | |
583 | !examine_argument (class, n, &needed_intregs, &needed_sseregs) | |
584 | || intreg + needed_intregs > INT_REGS | |
585 | || ssereg + needed_sseregs > SSE_REGS) | |
586 | { /* memory class */ | |
587 | sp = value_push (sp, args[i]); | |
588 | } | |
589 | else | |
590 | { | |
591 | int j; | |
592 | for (j = 0; j < n; j++) | |
593 | { | |
594 | int offset = 0; | |
595 | switch (class[j]) | |
596 | { | |
597 | case X86_64_NO_CLASS: | |
598 | break; | |
599 | case X86_64_INTEGER_CLASS: | |
600 | write_register_gen (int_parameter_registers[(intreg + 1) / 2], | |
601 | VALUE_CONTENTS_ALL (args[i]) + offset); | |
602 | offset += 8; | |
603 | intreg += 2; | |
604 | break; | |
605 | case X86_64_INTEGERSI_CLASS: | |
606 | write_register_gen (int_parameter_registers[intreg / 2], | |
607 | VALUE_CONTENTS_ALL (args[i]) + offset); | |
608 | offset += 8; | |
609 | intreg++; | |
610 | break; | |
611 | case X86_64_SSEDF_CLASS: | |
612 | case X86_64_SSESF_CLASS: | |
613 | case X86_64_SSE_CLASS: | |
614 | write_register_gen (sse_parameter_registers[(ssereg + 1) / 2], | |
615 | VALUE_CONTENTS_ALL (args[i]) + offset); | |
616 | offset += 8; | |
617 | ssereg += 2; | |
618 | break; | |
619 | case X86_64_SSEUP_CLASS: | |
620 | write_register_gen (sse_parameter_registers[ssereg / 2], | |
621 | VALUE_CONTENTS_ALL (args[i]) + offset); | |
622 | offset += 8; | |
623 | ssereg++; | |
624 | break; | |
625 | case X86_64_X87_CLASS: | |
626 | case X86_64_X87UP_CLASS: | |
627 | case X86_64_MEMORY_CLASS: | |
628 | sp = value_push (sp, args[i]); | |
629 | break; | |
630 | default: | |
631 | internal_error (__FILE__, __LINE__, | |
632 | "Unexpected argument class"); | |
633 | } | |
634 | intreg += intreg % 2; | |
635 | ssereg += ssereg % 2; | |
636 | } | |
637 | } | |
638 | } | |
639 | return sp; | |
640 | } | |
641 | ||
642 | /* Write into the appropriate registers a function return value stored | |
643 | in VALBUF of type TYPE, given in virtual format. */ | |
644 | void | |
645 | x86_64_store_return_value (struct type *type, char *valbuf) | |
646 | { | |
647 | int len = TYPE_LENGTH (type); | |
648 | ||
649 | if (TYPE_CODE_FLT == TYPE_CODE (type)) | |
650 | { | |
651 | /* Floating-point return values can be found in %st(0). */ | |
652 | if (len == TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT | |
653 | && TARGET_LONG_DOUBLE_FORMAT == &floatformat_i387_ext) | |
654 | { | |
655 | /* Copy straight over. */ | |
656 | write_register_bytes (REGISTER_BYTE (FP0_REGNUM), valbuf, | |
657 | FPU_REG_RAW_SIZE); | |
658 | } | |
659 | else | |
660 | { | |
661 | char buf[FPU_REG_RAW_SIZE]; | |
662 | DOUBLEST val; | |
663 | ||
664 | /* Convert the value found in VALBUF to the extended | |
665 | floating point format used by the FPU. This is probably | |
666 | not exactly how it would happen on the target itself, but | |
667 | it is the best we can do. */ | |
668 | val = extract_floating (valbuf, TYPE_LENGTH (type)); | |
669 | floatformat_from_doublest (&floatformat_i387_ext, &val, buf); | |
670 | write_register_bytes (REGISTER_BYTE (FP0_REGNUM), buf, | |
671 | FPU_REG_RAW_SIZE); | |
672 | } | |
673 | } | |
674 | else | |
675 | { | |
676 | int low_size = REGISTER_RAW_SIZE (0); | |
677 | int high_size = REGISTER_RAW_SIZE (1); | |
678 | ||
679 | if (len <= low_size) | |
680 | write_register_bytes (REGISTER_BYTE (0), valbuf, len); | |
681 | else if (len <= (low_size + high_size)) | |
682 | { | |
683 | write_register_bytes (REGISTER_BYTE (0), valbuf, low_size); | |
684 | write_register_bytes (REGISTER_BYTE (1), | |
685 | valbuf + low_size, len - low_size); | |
686 | } | |
687 | else | |
688 | internal_error (__FILE__, __LINE__, | |
689 | "Cannot store return value of %d bytes long.", len); | |
690 | } | |
691 | } | |
692 | \f | |
693 | ||
694 | static char * | |
695 | x86_64_register_name (int reg_nr) | |
696 | { | |
697 | static char *register_names[] = { | |
698 | "rax", "rdx", "rcx", "rbx", | |
699 | "rsi", "rdi", "rbp", "rsp", | |
700 | "r8", "r9", "r10", "r11", | |
701 | "r12", "r13", "r14", "r15", | |
702 | "rip", "eflags", | |
703 | "st0", "st1", "st2", "st3", | |
704 | "st4", "st5", "st6", "st7", | |
705 | "fctrl", "fstat", "ftag", "fiseg", | |
706 | "fioff", "foseg", "fooff", "fop", | |
707 | "xmm0", "xmm1", "xmm2", "xmm3", | |
708 | "xmm4", "xmm5", "xmm6", "xmm7", | |
709 | "xmm8", "xmm9", "xmm10", "xmm11", | |
710 | "xmm12", "xmm13", "xmm14", "xmm15", | |
711 | "mxcsr" | |
712 | }; | |
713 | if (reg_nr < 0) | |
714 | return NULL; | |
715 | if (reg_nr >= (sizeof (register_names) / sizeof (*register_names))) | |
716 | return NULL; | |
717 | return register_names[reg_nr]; | |
718 | } | |
719 | \f | |
720 | ||
721 | ||
722 | /* We have two flavours of disassembly. The machinery on this page | |
723 | deals with switching between those. */ | |
724 | ||
725 | static int | |
726 | gdb_print_insn_x86_64 (bfd_vma memaddr, disassemble_info * info) | |
727 | { | |
728 | if (disassembly_flavour == att_flavour) | |
729 | return print_insn_i386_att (memaddr, info); | |
730 | else if (disassembly_flavour == intel_flavour) | |
731 | return print_insn_i386_intel (memaddr, info); | |
732 | /* Never reached -- disassembly_flavour is always either att_flavour | |
733 | or intel_flavour. */ | |
734 | internal_error (__FILE__, __LINE__, "failed internal consistency check"); | |
735 | } | |
736 | \f | |
737 | ||
738 | /* Store the address of the place in which to copy the structure the | |
739 | subroutine will return. This is called from call_function. */ | |
740 | void | |
741 | x86_64_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) | |
742 | { | |
743 | write_register (RDI_REGNUM, addr); | |
744 | } | |
745 | ||
746 | int | |
747 | x86_64_frameless_function_invocation (struct frame_info *frame) | |
748 | { | |
749 | return 0; | |
750 | } | |
751 | ||
752 | /* On x86_64 there are no reasonable prologs. */ | |
753 | CORE_ADDR | |
754 | x86_64_skip_prologue (CORE_ADDR pc) | |
755 | { | |
756 | return pc; | |
757 | } | |
758 | ||
759 | /* Sequence of bytes for breakpoint instruction. */ | |
760 | static unsigned char * | |
761 | x86_64_breakpoint_from_pc (CORE_ADDR *pc, int *lenptr) | |
762 | { | |
763 | static unsigned char breakpoint[] = { 0xcc }; | |
764 | *lenptr = 1; | |
765 | return breakpoint; | |
766 | } | |
767 | ||
768 | static struct gdbarch * | |
769 | i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
770 | { | |
771 | struct gdbarch *gdbarch; | |
772 | struct gdbarch_tdep *tdep; | |
773 | ||
774 | /* Find a candidate among the list of pre-declared architectures. */ | |
775 | for (arches = gdbarch_list_lookup_by_info (arches, &info); | |
776 | arches != NULL; | |
777 | arches = gdbarch_list_lookup_by_info (arches->next, &info)) | |
778 | { | |
779 | switch (info.bfd_arch_info->mach) | |
780 | { | |
781 | case bfd_mach_x86_64: | |
782 | case bfd_mach_x86_64_intel_syntax: | |
783 | switch (gdbarch_bfd_arch_info (arches->gdbarch)->mach) | |
784 | { | |
785 | case bfd_mach_x86_64: | |
786 | case bfd_mach_x86_64_intel_syntax: | |
787 | return arches->gdbarch; | |
788 | case bfd_mach_i386_i386: | |
789 | case bfd_mach_i386_i8086: | |
790 | case bfd_mach_i386_i386_intel_syntax: | |
791 | break; | |
792 | default: | |
793 | internal_error (__FILE__, __LINE__, | |
794 | "i386_gdbarch_init: unknown machine type"); | |
795 | } | |
796 | break; | |
797 | case bfd_mach_i386_i386: | |
798 | case bfd_mach_i386_i8086: | |
799 | case bfd_mach_i386_i386_intel_syntax: | |
800 | switch (gdbarch_bfd_arch_info (arches->gdbarch)->mach) | |
801 | { | |
802 | case bfd_mach_x86_64: | |
803 | case bfd_mach_x86_64_intel_syntax: | |
804 | break; | |
805 | case bfd_mach_i386_i386: | |
806 | case bfd_mach_i386_i8086: | |
807 | case bfd_mach_i386_i386_intel_syntax: | |
808 | return arches->gdbarch; | |
809 | default: | |
810 | internal_error (__FILE__, __LINE__, | |
811 | "i386_gdbarch_init: unknown machine type"); | |
812 | } | |
813 | break; | |
814 | default: | |
815 | internal_error (__FILE__, __LINE__, | |
816 | "i386_gdbarch_init: unknown machine type"); | |
817 | } | |
818 | } | |
819 | ||
820 | tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep)); | |
821 | gdbarch = gdbarch_alloc (&info, tdep); | |
822 | ||
823 | switch (info.bfd_arch_info->mach) | |
824 | { | |
825 | case bfd_mach_x86_64: | |
826 | case bfd_mach_x86_64_intel_syntax: | |
827 | tdep->last_fpu_regnum = 25; | |
828 | tdep->first_xmm_regnum = 34; | |
829 | tdep->last_xmm_regnum = 49; | |
830 | tdep->mxcsr_regnum = 50; | |
831 | tdep->first_fpu_ctrl_regnum = 26; | |
832 | break; | |
833 | case bfd_mach_i386_i386: | |
834 | case bfd_mach_i386_i8086: | |
835 | case bfd_mach_i386_i386_intel_syntax: | |
836 | /* This is place for definition of i386 target vector. */ | |
837 | break; | |
838 | default: | |
839 | internal_error (__FILE__, __LINE__, | |
840 | "i386_gdbarch_init: unknown machine type"); | |
841 | } | |
842 | ||
843 | set_gdbarch_long_bit (gdbarch, 64); | |
844 | set_gdbarch_long_long_bit (gdbarch, 64); | |
845 | set_gdbarch_ptr_bit (gdbarch, 64); | |
846 | ||
847 | set_gdbarch_long_double_format (gdbarch, &floatformat_i387_ext); | |
848 | set_gdbarch_ieee_float (gdbarch, 1); | |
849 | ||
850 | ||
851 | set_gdbarch_num_regs (gdbarch, X86_64_NUM_REGS); | |
852 | set_gdbarch_register_name (gdbarch, x86_64_register_name); | |
853 | set_gdbarch_register_size (gdbarch, 8); | |
854 | set_gdbarch_register_raw_size (gdbarch, x86_64_register_raw_size); | |
855 | set_gdbarch_max_register_raw_size (gdbarch, 16); | |
856 | set_gdbarch_register_byte (gdbarch, x86_64_register_byte); | |
857 | /* Total amount of space needed to store our copies of the machine's register | |
858 | (SIZEOF_GREGS + SIZEOF_FPU_REGS + SIZEOF_FPU_CTRL_REGS + SIZEOF_SSE_REGS) */ | |
859 | set_gdbarch_register_bytes (gdbarch, | |
860 | (18 * 8) + (8 * 10) + (8 * 4) + (8 * 16 + 4)); | |
861 | set_gdbarch_register_virtual_size (gdbarch, x86_64_register_virtual_size); | |
862 | set_gdbarch_max_register_virtual_size (gdbarch, 16); | |
863 | ||
864 | set_gdbarch_register_virtual_type (gdbarch, x86_64_register_virtual_type); | |
865 | ||
866 | set_gdbarch_register_convertible (gdbarch, x86_64_register_convertible); | |
867 | set_gdbarch_register_convert_to_virtual (gdbarch, | |
868 | x86_64_register_convert_to_virtual); | |
869 | set_gdbarch_register_convert_to_raw (gdbarch, | |
870 | x86_64_register_convert_to_raw); | |
871 | ||
872 | /* Register numbers of various important registers. */ | |
873 | set_gdbarch_sp_regnum (gdbarch, 7); /* (rsp) Contains address of top of stack. */ | |
874 | set_gdbarch_fp_regnum (gdbarch, 6); /* (rbp) */ | |
875 | set_gdbarch_pc_regnum (gdbarch, 16); /* (rip) Contains program counter. */ | |
876 | ||
877 | set_gdbarch_fp0_regnum (gdbarch, 18); /* First FPU floating-point register. */ | |
878 | ||
879 | set_gdbarch_read_fp (gdbarch, cfi_read_fp); | |
880 | set_gdbarch_write_fp (gdbarch, cfi_write_fp); | |
881 | ||
882 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
883 | set_gdbarch_pop_frame (gdbarch, x86_64_pop_frame); | |
884 | ||
885 | /* FRAME_CHAIN takes a frame's nominal address and produces the frame's | |
886 | chain-pointer. */ | |
887 | set_gdbarch_frame_chain (gdbarch, cfi_frame_chain); | |
888 | ||
889 | set_gdbarch_frameless_function_invocation (gdbarch, | |
890 | x86_64_frameless_function_invocation); | |
891 | set_gdbarch_frame_saved_pc (gdbarch, x86_64_linux_frame_saved_pc); | |
892 | ||
893 | set_gdbarch_frame_args_address (gdbarch, default_frame_address); | |
894 | set_gdbarch_frame_locals_address (gdbarch, default_frame_address); | |
895 | ||
896 | /* Return number of bytes at start of arglist that are not really args. */ | |
897 | set_gdbarch_frame_args_skip (gdbarch, 8); | |
898 | ||
899 | set_gdbarch_frame_init_saved_regs (gdbarch, x86_64_frame_init_saved_regs); | |
900 | ||
901 | /* Frame pc initialization is handled by unwind informations. */ | |
902 | set_gdbarch_init_frame_pc (gdbarch, cfi_init_frame_pc); | |
903 | ||
904 | /* Initialization of unwind informations. */ | |
905 | set_gdbarch_init_extra_frame_info (gdbarch, cfi_init_extra_frame_info); | |
906 | ||
907 | /* Getting saved registers is handled by unwind informations. */ | |
908 | set_gdbarch_get_saved_register (gdbarch, cfi_get_saved_register); | |
909 | ||
910 | set_gdbarch_frame_init_saved_regs (gdbarch, x86_64_frame_init_saved_regs); | |
911 | ||
912 | /* Cons up virtual frame pointer for trace */ | |
913 | set_gdbarch_virtual_frame_pointer (gdbarch, cfi_virtual_frame_pointer); | |
914 | ||
915 | ||
916 | set_gdbarch_frame_chain_valid (gdbarch, generic_file_frame_chain_valid); | |
917 | ||
918 | set_gdbarch_use_generic_dummy_frames (gdbarch, 1); | |
919 | set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT); | |
920 | set_gdbarch_call_dummy_address (gdbarch, entry_point_address); | |
921 | set_gdbarch_call_dummy_length (gdbarch, 0); | |
922 | set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0); | |
923 | set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1); | |
924 | set_gdbarch_pc_in_call_dummy (gdbarch, pc_in_call_dummy_at_entry_point); | |
925 | set_gdbarch_call_dummy_words (gdbarch, 0); | |
926 | set_gdbarch_sizeof_call_dummy_words (gdbarch, 0); | |
927 | set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); | |
928 | set_gdbarch_call_dummy_p (gdbarch, 1); | |
929 | set_gdbarch_call_dummy_start_offset (gdbarch, 0); | |
930 | set_gdbarch_push_dummy_frame (gdbarch, generic_push_dummy_frame); | |
931 | set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy); | |
932 | set_gdbarch_push_return_address (gdbarch, x86_64_push_return_address); | |
933 | set_gdbarch_push_arguments (gdbarch, x86_64_push_arguments); | |
934 | ||
935 | /* Return number of args passed to a frame, no way to tell. */ | |
936 | set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown); | |
937 | /* Don't use default structure extract routine */ | |
938 | set_gdbarch_extract_struct_value_address (gdbarch, 0); | |
939 | ||
940 | /* If USE_STRUCT_CONVENTION retruns 0, then gdb uses STORE_RETURN_VALUE | |
941 | and EXTRACT_RETURN_VALUE to store/fetch the functions return value. It is | |
942 | the case when structure is returned in registers. */ | |
943 | set_gdbarch_use_struct_convention (gdbarch, x86_64_use_struct_convention); | |
944 | ||
945 | /* Store the address of the place in which to copy the structure the | |
946 | subroutine will return. This is called from call_function. */ | |
947 | set_gdbarch_store_struct_return (gdbarch, x86_64_store_struct_return); | |
948 | ||
949 | /* Extract from an array REGBUF containing the (raw) register state | |
950 | a function return value of type TYPE, and copy that, in virtual format, | |
951 | into VALBUF. */ | |
952 | set_gdbarch_extract_return_value (gdbarch, x86_64_extract_return_value); | |
953 | ||
954 | ||
955 | /* Write into the appropriate registers a function return value stored | |
956 | in VALBUF of type TYPE, given in virtual format. */ | |
957 | set_gdbarch_store_return_value (gdbarch, x86_64_store_return_value); | |
958 | \f | |
959 | ||
960 | /* Offset from address of function to start of its code. */ | |
961 | set_gdbarch_function_start_offset (gdbarch, 0); | |
962 | ||
963 | set_gdbarch_skip_prologue (gdbarch, x86_64_skip_prologue); | |
964 | ||
965 | set_gdbarch_saved_pc_after_call (gdbarch, x86_64_linux_saved_pc_after_call); | |
966 | ||
967 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
968 | ||
969 | set_gdbarch_breakpoint_from_pc (gdbarch, x86_64_breakpoint_from_pc); | |
970 | ||
971 | ||
972 | /* Amount PC must be decremented by after a breakpoint. This is often the | |
973 | number of bytes in BREAKPOINT but not always. */ | |
974 | set_gdbarch_decr_pc_after_break (gdbarch, 1); | |
975 | ||
976 | return gdbarch; | |
977 | } | |
978 | ||
979 | void | |
980 | _initialize_x86_64_tdep (void) | |
981 | { | |
982 | register_gdbarch_init (bfd_arch_i386, i386_gdbarch_init); | |
983 | ||
984 | /* Initialize the table saying where each register starts in the | |
985 | register file. */ | |
986 | { | |
987 | int i, offset; | |
988 | ||
989 | offset = 0; | |
990 | for (i = 0; i < X86_64_NUM_REGS; i++) | |
991 | { | |
992 | x86_64_register_byte_table[i] = offset; | |
993 | offset += x86_64_register_raw_size_table[i]; | |
994 | } | |
995 | } | |
996 | ||
997 | tm_print_insn = gdb_print_insn_x86_64; | |
998 | tm_print_insn_info.mach = bfd_lookup_arch (bfd_arch_i386, 3)->mach; | |
999 | ||
1000 | /* Add the variable that controls the disassembly flavour. */ | |
1001 | { | |
1002 | struct cmd_list_element *new_cmd; | |
1003 | ||
1004 | new_cmd = add_set_enum_cmd ("disassembly-flavour", no_class, | |
1005 | valid_flavours, &disassembly_flavour, "\ | |
1006 | Set the disassembly flavour, the valid values are \"att\" and \"intel\", \ | |
1007 | and the default value is \"att\".", &setlist); | |
1008 | add_show_from_set (new_cmd, &showlist); | |
1009 | } | |
1010 | } |