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61baf725 | 1 | /* Copyright (C) 2009-2017 Free Software Foundation, Inc. |
d0761299 JB |
2 | |
3 | This file is part of GDB. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include "defs.h" | |
19 | #include "osabi.h" | |
20 | #include "amd64-tdep.h" | |
ba581dc1 | 21 | #include "gdbtypes.h" |
cba6fab5 JB |
22 | #include "gdbcore.h" |
23 | #include "regcache.h" | |
a8e1bb34 | 24 | #include "windows-tdep.h" |
84552b16 | 25 | #include "frame.h" |
9058cc3a TG |
26 | #include "objfiles.h" |
27 | #include "frame-unwind.h" | |
28 | #include "coff/internal.h" | |
29 | #include "coff/i386.h" | |
30 | #include "coff/pe.h" | |
31 | #include "libcoff.h" | |
20c2e3e0 | 32 | #include "value.h" |
325fac50 | 33 | #include <algorithm> |
ba581dc1 JB |
34 | |
35 | /* The registers used to pass integer arguments during a function call. */ | |
36 | static int amd64_windows_dummy_call_integer_regs[] = | |
37 | { | |
38 | AMD64_RCX_REGNUM, /* %rcx */ | |
39 | AMD64_RDX_REGNUM, /* %rdx */ | |
5b856f36 PM |
40 | AMD64_R8_REGNUM, /* %r8 */ |
41 | AMD64_R9_REGNUM /* %r9 */ | |
ba581dc1 JB |
42 | }; |
43 | ||
20c2e3e0 JB |
44 | /* Return nonzero if an argument of type TYPE should be passed |
45 | via one of the integer registers. */ | |
ba581dc1 | 46 | |
20c2e3e0 JB |
47 | static int |
48 | amd64_windows_passed_by_integer_register (struct type *type) | |
ba581dc1 JB |
49 | { |
50 | switch (TYPE_CODE (type)) | |
51 | { | |
20c2e3e0 JB |
52 | case TYPE_CODE_INT: |
53 | case TYPE_CODE_ENUM: | |
54 | case TYPE_CODE_BOOL: | |
55 | case TYPE_CODE_RANGE: | |
56 | case TYPE_CODE_CHAR: | |
57 | case TYPE_CODE_PTR: | |
58 | case TYPE_CODE_REF: | |
ba581dc1 JB |
59 | case TYPE_CODE_STRUCT: |
60 | case TYPE_CODE_UNION: | |
20c2e3e0 JB |
61 | return (TYPE_LENGTH (type) == 1 |
62 | || TYPE_LENGTH (type) == 2 | |
63 | || TYPE_LENGTH (type) == 4 | |
64 | || TYPE_LENGTH (type) == 8); | |
ba581dc1 JB |
65 | |
66 | default: | |
20c2e3e0 | 67 | return 0; |
ba581dc1 JB |
68 | } |
69 | } | |
d0761299 | 70 | |
20c2e3e0 JB |
71 | /* Return nonzero if an argument of type TYPE should be passed |
72 | via one of the XMM registers. */ | |
73 | ||
74 | static int | |
75 | amd64_windows_passed_by_xmm_register (struct type *type) | |
76 | { | |
77 | return ((TYPE_CODE (type) == TYPE_CODE_FLT | |
78 | || TYPE_CODE (type) == TYPE_CODE_DECFLOAT) | |
79 | && (TYPE_LENGTH (type) == 4 || TYPE_LENGTH (type) == 8)); | |
80 | } | |
81 | ||
82 | /* Return non-zero iff an argument of the given TYPE should be passed | |
83 | by pointer. */ | |
84 | ||
85 | static int | |
86 | amd64_windows_passed_by_pointer (struct type *type) | |
87 | { | |
88 | if (amd64_windows_passed_by_integer_register (type)) | |
89 | return 0; | |
90 | ||
91 | if (amd64_windows_passed_by_xmm_register (type)) | |
92 | return 0; | |
93 | ||
94 | return 1; | |
95 | } | |
96 | ||
97 | /* For each argument that should be passed by pointer, reserve some | |
98 | stack space, store a copy of the argument on the stack, and replace | |
99 | the argument by its address. Return the new Stack Pointer value. | |
100 | ||
101 | NARGS is the number of arguments. ARGS is the array containing | |
102 | the value of each argument. SP is value of the Stack Pointer. */ | |
103 | ||
104 | static CORE_ADDR | |
105 | amd64_windows_adjust_args_passed_by_pointer (struct value **args, | |
106 | int nargs, CORE_ADDR sp) | |
107 | { | |
108 | int i; | |
109 | ||
110 | for (i = 0; i < nargs; i++) | |
111 | if (amd64_windows_passed_by_pointer (value_type (args[i]))) | |
112 | { | |
113 | struct type *type = value_type (args[i]); | |
114 | const gdb_byte *valbuf = value_contents (args[i]); | |
115 | const int len = TYPE_LENGTH (type); | |
116 | ||
117 | /* Store a copy of that argument on the stack, aligned to | |
118 | a 16 bytes boundary, and then use the copy's address as | |
119 | the argument. */ | |
120 | ||
121 | sp -= len; | |
122 | sp &= ~0xf; | |
123 | write_memory (sp, valbuf, len); | |
124 | ||
125 | args[i] | |
126 | = value_addr (value_from_contents_and_address (type, valbuf, sp)); | |
127 | } | |
128 | ||
129 | return sp; | |
130 | } | |
131 | ||
132 | /* Store the value of ARG in register REGNO (right-justified). | |
133 | REGCACHE is the register cache. */ | |
134 | ||
135 | static void | |
136 | amd64_windows_store_arg_in_reg (struct regcache *regcache, | |
137 | struct value *arg, int regno) | |
138 | { | |
139 | struct type *type = value_type (arg); | |
140 | const gdb_byte *valbuf = value_contents (arg); | |
141 | gdb_byte buf[8]; | |
142 | ||
143 | gdb_assert (TYPE_LENGTH (type) <= 8); | |
144 | memset (buf, 0, sizeof buf); | |
325fac50 | 145 | memcpy (buf, valbuf, std::min (TYPE_LENGTH (type), (unsigned int) 8)); |
20c2e3e0 JB |
146 | regcache_cooked_write (regcache, regno, buf); |
147 | } | |
148 | ||
149 | /* Push the arguments for an inferior function call, and return | |
150 | the updated value of the SP (Stack Pointer). | |
151 | ||
152 | All arguments are identical to the arguments used in | |
153 | amd64_windows_push_dummy_call. */ | |
154 | ||
155 | static CORE_ADDR | |
156 | amd64_windows_push_arguments (struct regcache *regcache, int nargs, | |
157 | struct value **args, CORE_ADDR sp, | |
158 | int struct_return) | |
159 | { | |
160 | int reg_idx = 0; | |
161 | int i; | |
8d749320 | 162 | struct value **stack_args = XALLOCAVEC (struct value *, nargs); |
20c2e3e0 JB |
163 | int num_stack_args = 0; |
164 | int num_elements = 0; | |
165 | int element = 0; | |
166 | ||
167 | /* First, handle the arguments passed by pointer. | |
168 | ||
169 | These arguments are replaced by pointers to a copy we are making | |
170 | in inferior memory. So use a copy of the ARGS table, to avoid | |
171 | modifying the original one. */ | |
172 | { | |
8d749320 | 173 | struct value **args1 = XALLOCAVEC (struct value *, nargs); |
20c2e3e0 JB |
174 | |
175 | memcpy (args1, args, nargs * sizeof (struct value *)); | |
176 | sp = amd64_windows_adjust_args_passed_by_pointer (args1, nargs, sp); | |
177 | args = args1; | |
178 | } | |
179 | ||
180 | /* Reserve a register for the "hidden" argument. */ | |
181 | if (struct_return) | |
182 | reg_idx++; | |
183 | ||
184 | for (i = 0; i < nargs; i++) | |
185 | { | |
186 | struct type *type = value_type (args[i]); | |
187 | int len = TYPE_LENGTH (type); | |
188 | int on_stack_p = 1; | |
189 | ||
190 | if (reg_idx < ARRAY_SIZE (amd64_windows_dummy_call_integer_regs)) | |
191 | { | |
192 | if (amd64_windows_passed_by_integer_register (type)) | |
193 | { | |
194 | amd64_windows_store_arg_in_reg | |
195 | (regcache, args[i], | |
196 | amd64_windows_dummy_call_integer_regs[reg_idx]); | |
197 | on_stack_p = 0; | |
198 | reg_idx++; | |
199 | } | |
200 | else if (amd64_windows_passed_by_xmm_register (type)) | |
201 | { | |
202 | amd64_windows_store_arg_in_reg | |
203 | (regcache, args[i], AMD64_XMM0_REGNUM + reg_idx); | |
204 | /* In case of varargs, these parameters must also be | |
205 | passed via the integer registers. */ | |
206 | amd64_windows_store_arg_in_reg | |
207 | (regcache, args[i], | |
208 | amd64_windows_dummy_call_integer_regs[reg_idx]); | |
209 | on_stack_p = 0; | |
210 | reg_idx++; | |
211 | } | |
212 | } | |
213 | ||
214 | if (on_stack_p) | |
215 | { | |
216 | num_elements += ((len + 7) / 8); | |
217 | stack_args[num_stack_args++] = args[i]; | |
218 | } | |
219 | } | |
220 | ||
221 | /* Allocate space for the arguments on the stack, keeping it | |
222 | aligned on a 16 byte boundary. */ | |
223 | sp -= num_elements * 8; | |
224 | sp &= ~0xf; | |
225 | ||
226 | /* Write out the arguments to the stack. */ | |
227 | for (i = 0; i < num_stack_args; i++) | |
228 | { | |
229 | struct type *type = value_type (stack_args[i]); | |
230 | const gdb_byte *valbuf = value_contents (stack_args[i]); | |
231 | ||
232 | write_memory (sp + element * 8, valbuf, TYPE_LENGTH (type)); | |
233 | element += ((TYPE_LENGTH (type) + 7) / 8); | |
234 | } | |
235 | ||
236 | return sp; | |
237 | } | |
238 | ||
239 | /* Implement the "push_dummy_call" gdbarch method. */ | |
240 | ||
241 | static CORE_ADDR | |
242 | amd64_windows_push_dummy_call | |
243 | (struct gdbarch *gdbarch, struct value *function, | |
244 | struct regcache *regcache, CORE_ADDR bp_addr, | |
245 | int nargs, struct value **args, | |
246 | CORE_ADDR sp, int struct_return, CORE_ADDR struct_addr) | |
247 | { | |
248 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
249 | gdb_byte buf[8]; | |
250 | ||
251 | /* Pass arguments. */ | |
252 | sp = amd64_windows_push_arguments (regcache, nargs, args, sp, | |
253 | struct_return); | |
254 | ||
255 | /* Pass "hidden" argument". */ | |
256 | if (struct_return) | |
257 | { | |
258 | /* The "hidden" argument is passed throught the first argument | |
259 | register. */ | |
260 | const int arg_regnum = amd64_windows_dummy_call_integer_regs[0]; | |
261 | ||
262 | store_unsigned_integer (buf, 8, byte_order, struct_addr); | |
263 | regcache_cooked_write (regcache, arg_regnum, buf); | |
264 | } | |
265 | ||
266 | /* Reserve some memory on the stack for the integer-parameter | |
267 | registers, as required by the ABI. */ | |
268 | sp -= ARRAY_SIZE (amd64_windows_dummy_call_integer_regs) * 8; | |
269 | ||
270 | /* Store return address. */ | |
271 | sp -= 8; | |
272 | store_unsigned_integer (buf, 8, byte_order, bp_addr); | |
273 | write_memory (sp, buf, 8); | |
274 | ||
275 | /* Update the stack pointer... */ | |
276 | store_unsigned_integer (buf, 8, byte_order, sp); | |
277 | regcache_cooked_write (regcache, AMD64_RSP_REGNUM, buf); | |
278 | ||
279 | /* ...and fake a frame pointer. */ | |
280 | regcache_cooked_write (regcache, AMD64_RBP_REGNUM, buf); | |
281 | ||
282 | return sp + 16; | |
283 | } | |
284 | ||
cba6fab5 JB |
285 | /* Implement the "return_value" gdbarch method for amd64-windows. */ |
286 | ||
287 | static enum return_value_convention | |
6a3a010b | 288 | amd64_windows_return_value (struct gdbarch *gdbarch, struct value *function, |
cba6fab5 JB |
289 | struct type *type, struct regcache *regcache, |
290 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
291 | { | |
292 | int len = TYPE_LENGTH (type); | |
293 | int regnum = -1; | |
294 | ||
295 | /* See if our value is returned through a register. If it is, then | |
296 | store the associated register number in REGNUM. */ | |
297 | switch (TYPE_CODE (type)) | |
298 | { | |
299 | case TYPE_CODE_FLT: | |
300 | case TYPE_CODE_DECFLOAT: | |
301 | /* __m128, __m128i, __m128d, floats, and doubles are returned | |
302 | via XMM0. */ | |
303 | if (len == 4 || len == 8 || len == 16) | |
304 | regnum = AMD64_XMM0_REGNUM; | |
305 | break; | |
306 | default: | |
307 | /* All other values that are 1, 2, 4 or 8 bytes long are returned | |
308 | via RAX. */ | |
309 | if (len == 1 || len == 2 || len == 4 || len == 8) | |
310 | regnum = AMD64_RAX_REGNUM; | |
311 | break; | |
312 | } | |
313 | ||
314 | if (regnum < 0) | |
315 | { | |
316 | /* RAX contains the address where the return value has been stored. */ | |
317 | if (readbuf) | |
318 | { | |
319 | ULONGEST addr; | |
320 | ||
321 | regcache_raw_read_unsigned (regcache, AMD64_RAX_REGNUM, &addr); | |
322 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
323 | } | |
324 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
325 | } | |
326 | else | |
327 | { | |
328 | /* Extract the return value from the register where it was stored. */ | |
329 | if (readbuf) | |
330 | regcache_raw_read_part (regcache, regnum, 0, len, readbuf); | |
331 | if (writebuf) | |
332 | regcache_raw_write_part (regcache, regnum, 0, len, writebuf); | |
333 | return RETURN_VALUE_REGISTER_CONVENTION; | |
334 | } | |
335 | } | |
336 | ||
99e24b90 PM |
337 | /* Check that the code pointed to by PC corresponds to a call to |
338 | __main, skip it if so. Return PC otherwise. */ | |
339 | ||
340 | static CORE_ADDR | |
341 | amd64_skip_main_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) | |
342 | { | |
343 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
344 | gdb_byte op; | |
345 | ||
346 | target_read_memory (pc, &op, 1); | |
347 | if (op == 0xe8) | |
348 | { | |
349 | gdb_byte buf[4]; | |
350 | ||
351 | if (target_read_memory (pc + 1, buf, sizeof buf) == 0) | |
352 | { | |
7cbd4a93 | 353 | struct bound_minimal_symbol s; |
99e24b90 PM |
354 | CORE_ADDR call_dest; |
355 | ||
356 | call_dest = pc + 5 + extract_signed_integer (buf, 4, byte_order); | |
357 | s = lookup_minimal_symbol_by_pc (call_dest); | |
7cbd4a93 | 358 | if (s.minsym != NULL |
efd66ac6 TT |
359 | && MSYMBOL_LINKAGE_NAME (s.minsym) != NULL |
360 | && strcmp (MSYMBOL_LINKAGE_NAME (s.minsym), "__main") == 0) | |
99e24b90 PM |
361 | pc += 5; |
362 | } | |
363 | } | |
364 | ||
365 | return pc; | |
366 | } | |
367 | ||
9058cc3a TG |
368 | struct amd64_windows_frame_cache |
369 | { | |
370 | /* ImageBase for the module. */ | |
371 | CORE_ADDR image_base; | |
372 | ||
373 | /* Function start and end rva. */ | |
374 | CORE_ADDR start_rva; | |
375 | CORE_ADDR end_rva; | |
376 | ||
377 | /* Next instruction to be executed. */ | |
378 | CORE_ADDR pc; | |
379 | ||
380 | /* Current sp. */ | |
381 | CORE_ADDR sp; | |
382 | ||
383 | /* Address of saved integer and xmm registers. */ | |
384 | CORE_ADDR prev_reg_addr[16]; | |
385 | CORE_ADDR prev_xmm_addr[16]; | |
386 | ||
387 | /* These two next fields are set only for machine info frames. */ | |
388 | ||
389 | /* Likewise for RIP. */ | |
390 | CORE_ADDR prev_rip_addr; | |
391 | ||
392 | /* Likewise for RSP. */ | |
393 | CORE_ADDR prev_rsp_addr; | |
394 | ||
395 | /* Address of the previous frame. */ | |
396 | CORE_ADDR prev_sp; | |
397 | }; | |
398 | ||
399 | /* Convert a Windows register number to gdb. */ | |
400 | static const enum amd64_regnum amd64_windows_w2gdb_regnum[] = | |
401 | { | |
402 | AMD64_RAX_REGNUM, | |
403 | AMD64_RCX_REGNUM, | |
404 | AMD64_RDX_REGNUM, | |
405 | AMD64_RBX_REGNUM, | |
406 | AMD64_RSP_REGNUM, | |
407 | AMD64_RBP_REGNUM, | |
408 | AMD64_RSI_REGNUM, | |
409 | AMD64_RDI_REGNUM, | |
410 | AMD64_R8_REGNUM, | |
411 | AMD64_R9_REGNUM, | |
412 | AMD64_R10_REGNUM, | |
413 | AMD64_R11_REGNUM, | |
414 | AMD64_R12_REGNUM, | |
415 | AMD64_R13_REGNUM, | |
416 | AMD64_R14_REGNUM, | |
417 | AMD64_R15_REGNUM | |
418 | }; | |
419 | ||
420 | /* Return TRUE iff PC is the the range of the function corresponding to | |
421 | CACHE. */ | |
422 | ||
423 | static int | |
424 | pc_in_range (CORE_ADDR pc, const struct amd64_windows_frame_cache *cache) | |
425 | { | |
426 | return (pc >= cache->image_base + cache->start_rva | |
427 | && pc < cache->image_base + cache->end_rva); | |
428 | } | |
429 | ||
430 | /* Try to recognize and decode an epilogue sequence. | |
431 | ||
432 | Return -1 if we fail to read the instructions for any reason. | |
433 | Return 1 if an epilogue sequence was recognized, 0 otherwise. */ | |
434 | ||
435 | static int | |
436 | amd64_windows_frame_decode_epilogue (struct frame_info *this_frame, | |
437 | struct amd64_windows_frame_cache *cache) | |
438 | { | |
439 | /* According to MSDN an epilogue "must consist of either an add RSP,constant | |
440 | or lea RSP,constant[FPReg], followed by a series of zero or more 8-byte | |
441 | register pops and a return or a jmp". | |
442 | ||
443 | Furthermore, according to RtlVirtualUnwind, the complete list of | |
444 | epilog marker is: | |
445 | - ret [c3] | |
446 | - ret n [c2 imm16] | |
447 | - rep ret [f3 c3] | |
448 | - jmp imm8 | imm32 [eb rel8] or [e9 rel32] | |
449 | - jmp qword ptr imm32 - not handled | |
450 | - rex.w jmp reg [4X ff eY] | |
451 | */ | |
452 | ||
453 | CORE_ADDR pc = cache->pc; | |
454 | CORE_ADDR cur_sp = cache->sp; | |
455 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
456 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
457 | gdb_byte op; | |
458 | gdb_byte rex; | |
459 | ||
460 | /* We don't care about the instruction deallocating the frame: | |
461 | if it hasn't been executed, the pc is still in the body, | |
462 | if it has been executed, the following epilog decoding will work. */ | |
463 | ||
464 | /* First decode: | |
465 | - pop reg [41 58-5f] or [58-5f]. */ | |
466 | ||
467 | while (1) | |
468 | { | |
469 | /* Read opcode. */ | |
470 | if (target_read_memory (pc, &op, 1) != 0) | |
471 | return -1; | |
472 | ||
473 | if (op >= 0x40 && op <= 0x4f) | |
474 | { | |
475 | /* REX prefix. */ | |
476 | rex = op; | |
477 | ||
478 | /* Read opcode. */ | |
479 | if (target_read_memory (pc + 1, &op, 1) != 0) | |
480 | return -1; | |
481 | } | |
482 | else | |
483 | rex = 0; | |
484 | ||
485 | if (op >= 0x58 && op <= 0x5f) | |
486 | { | |
487 | /* pop reg */ | |
488 | gdb_byte reg = (op & 0x0f) | ((rex & 1) << 3); | |
489 | ||
490 | cache->prev_reg_addr[amd64_windows_w2gdb_regnum[reg]] = cur_sp; | |
491 | cur_sp += 8; | |
a6a20ad7 | 492 | pc += rex ? 2 : 1; |
9058cc3a TG |
493 | } |
494 | else | |
495 | break; | |
496 | ||
497 | /* Allow the user to break this loop. This shouldn't happen as the | |
498 | number of consecutive pop should be small. */ | |
499 | QUIT; | |
500 | } | |
501 | ||
502 | /* Then decode the marker. */ | |
503 | ||
504 | /* Read opcode. */ | |
505 | if (target_read_memory (pc, &op, 1) != 0) | |
506 | return -1; | |
507 | ||
508 | switch (op) | |
509 | { | |
510 | case 0xc3: | |
511 | /* Ret. */ | |
512 | cache->prev_rip_addr = cur_sp; | |
513 | cache->prev_sp = cur_sp + 8; | |
514 | return 1; | |
515 | ||
516 | case 0xeb: | |
517 | { | |
518 | /* jmp rel8 */ | |
519 | gdb_byte rel8; | |
520 | CORE_ADDR npc; | |
521 | ||
522 | if (target_read_memory (pc + 1, &rel8, 1) != 0) | |
523 | return -1; | |
524 | npc = pc + 2 + (signed char) rel8; | |
525 | ||
526 | /* If the jump is within the function, then this is not a marker, | |
527 | otherwise this is a tail-call. */ | |
528 | return !pc_in_range (npc, cache); | |
529 | } | |
530 | ||
531 | case 0xec: | |
532 | { | |
533 | /* jmp rel32 */ | |
534 | gdb_byte rel32[4]; | |
535 | CORE_ADDR npc; | |
536 | ||
537 | if (target_read_memory (pc + 1, rel32, 4) != 0) | |
538 | return -1; | |
539 | npc = pc + 5 + extract_signed_integer (rel32, 4, byte_order); | |
540 | ||
541 | /* If the jump is within the function, then this is not a marker, | |
542 | otherwise this is a tail-call. */ | |
543 | return !pc_in_range (npc, cache); | |
544 | } | |
545 | ||
546 | case 0xc2: | |
547 | { | |
548 | /* ret n */ | |
549 | gdb_byte imm16[2]; | |
550 | ||
551 | if (target_read_memory (pc + 1, imm16, 2) != 0) | |
552 | return -1; | |
553 | cache->prev_rip_addr = cur_sp; | |
554 | cache->prev_sp = cur_sp | |
555 | + extract_unsigned_integer (imm16, 4, byte_order); | |
556 | return 1; | |
557 | } | |
558 | ||
559 | case 0xf3: | |
560 | { | |
561 | /* rep; ret */ | |
562 | gdb_byte op1; | |
563 | ||
564 | if (target_read_memory (pc + 2, &op1, 1) != 0) | |
565 | return -1; | |
566 | if (op1 != 0xc3) | |
567 | return 0; | |
568 | ||
569 | cache->prev_rip_addr = cur_sp; | |
570 | cache->prev_sp = cur_sp + 8; | |
571 | return 1; | |
572 | } | |
573 | ||
574 | case 0x40: | |
575 | case 0x41: | |
576 | case 0x42: | |
577 | case 0x43: | |
578 | case 0x44: | |
579 | case 0x45: | |
580 | case 0x46: | |
581 | case 0x47: | |
582 | case 0x48: | |
583 | case 0x49: | |
584 | case 0x4a: | |
585 | case 0x4b: | |
586 | case 0x4c: | |
587 | case 0x4d: | |
588 | case 0x4e: | |
589 | case 0x4f: | |
590 | /* Got a REX prefix, read next byte. */ | |
591 | rex = op; | |
592 | if (target_read_memory (pc + 1, &op, 1) != 0) | |
593 | return -1; | |
594 | ||
595 | if (op == 0xff) | |
596 | { | |
597 | /* rex jmp reg */ | |
598 | gdb_byte op1; | |
9058cc3a TG |
599 | |
600 | if (target_read_memory (pc + 2, &op1, 1) != 0) | |
601 | return -1; | |
602 | return (op1 & 0xf8) == 0xe0; | |
603 | } | |
604 | else | |
605 | return 0; | |
606 | ||
607 | default: | |
608 | /* Not REX, so unknown. */ | |
609 | return 0; | |
610 | } | |
611 | } | |
612 | ||
613 | /* Decode and execute unwind insns at UNWIND_INFO. */ | |
614 | ||
615 | static void | |
616 | amd64_windows_frame_decode_insns (struct frame_info *this_frame, | |
617 | struct amd64_windows_frame_cache *cache, | |
618 | CORE_ADDR unwind_info) | |
619 | { | |
620 | CORE_ADDR save_addr = 0; | |
621 | CORE_ADDR cur_sp = cache->sp; | |
622 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
623 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
670f82d4 TG |
624 | int first = 1; |
625 | ||
626 | /* There are at least 3 possibilities to share an unwind info entry: | |
627 | 1. Two different runtime_function entries (in .pdata) can point to the | |
628 | same unwind info entry. There is no such indication while unwinding, | |
629 | so we don't really care about that case. We suppose this scheme is | |
630 | used to save memory when the unwind entries are exactly the same. | |
631 | 2. Chained unwind_info entries, with no unwind codes (no prologue). | |
632 | There is a major difference with the previous case: the pc range for | |
633 | the function is different (in case 1, the pc range comes from the | |
634 | runtime_function entry; in case 2, the pc range for the chained entry | |
635 | comes from the first unwind entry). Case 1 cannot be used instead as | |
636 | the pc is not in the prologue. This case is officially documented. | |
637 | (There might be unwind code in the first unwind entry to handle | |
638 | additional unwinding). GCC (at least until gcc 5.0) doesn't chain | |
639 | entries. | |
640 | 3. Undocumented unwind info redirection. Hard to know the exact purpose, | |
641 | so it is considered as a memory optimization of case 2. | |
642 | */ | |
9058cc3a | 643 | |
670f82d4 TG |
644 | if (unwind_info & 1) |
645 | { | |
646 | /* Unofficially documented unwind info redirection, when UNWIND_INFO | |
647 | address is odd (http://www.codemachine.com/article_x64deepdive.html). | |
648 | */ | |
649 | struct external_pex64_runtime_function d; | |
670f82d4 TG |
650 | |
651 | if (target_read_memory (cache->image_base + (unwind_info & ~1), | |
652 | (gdb_byte *) &d, sizeof (d)) != 0) | |
653 | return; | |
654 | ||
655 | cache->start_rva | |
656 | = extract_unsigned_integer (d.rva_BeginAddress, 4, byte_order); | |
657 | cache->end_rva | |
658 | = extract_unsigned_integer (d.rva_EndAddress, 4, byte_order); | |
659 | unwind_info | |
660 | = extract_unsigned_integer (d.rva_UnwindData, 4, byte_order); | |
661 | } | |
662 | ||
663 | while (1) | |
9058cc3a TG |
664 | { |
665 | struct external_pex64_unwind_info ex_ui; | |
666 | /* There are at most 256 16-bit unwind insns. */ | |
667 | gdb_byte insns[2 * 256]; | |
668 | gdb_byte *p; | |
669 | gdb_byte *end_insns; | |
670 | unsigned char codes_count; | |
671 | unsigned char frame_reg; | |
670f82d4 | 672 | CORE_ADDR start; |
9058cc3a TG |
673 | |
674 | /* Read and decode header. */ | |
675 | if (target_read_memory (cache->image_base + unwind_info, | |
676 | (gdb_byte *) &ex_ui, sizeof (ex_ui)) != 0) | |
677 | return; | |
678 | ||
679 | if (frame_debug) | |
680 | fprintf_unfiltered | |
681 | (gdb_stdlog, | |
682 | "amd64_windows_frame_decodes_insn: " | |
683 | "%s: ver: %02x, plgsz: %02x, cnt: %02x, frame: %02x\n", | |
684 | paddress (gdbarch, unwind_info), | |
685 | ex_ui.Version_Flags, ex_ui.SizeOfPrologue, | |
686 | ex_ui.CountOfCodes, ex_ui.FrameRegisterOffset); | |
687 | ||
688 | /* Check version. */ | |
170d82c9 JB |
689 | if (PEX64_UWI_VERSION (ex_ui.Version_Flags) != 1 |
690 | && PEX64_UWI_VERSION (ex_ui.Version_Flags) != 2) | |
9058cc3a TG |
691 | return; |
692 | ||
670f82d4 TG |
693 | start = cache->image_base + cache->start_rva; |
694 | if (first | |
695 | && !(cache->pc >= start && cache->pc < start + ex_ui.SizeOfPrologue)) | |
9058cc3a | 696 | { |
670f82d4 TG |
697 | /* We want to detect if the PC points to an epilogue. This needs |
698 | to be checked only once, and an epilogue can be anywhere but in | |
699 | the prologue. If so, the epilogue detection+decoding function is | |
9058cc3a TG |
700 | sufficient. Otherwise, the unwinder will consider that the PC |
701 | is in the body of the function and will need to decode unwind | |
702 | info. */ | |
703 | if (amd64_windows_frame_decode_epilogue (this_frame, cache) == 1) | |
704 | return; | |
705 | ||
706 | /* Not in an epilog. Clear possible side effects. */ | |
707 | memset (cache->prev_reg_addr, 0, sizeof (cache->prev_reg_addr)); | |
708 | } | |
709 | ||
710 | codes_count = ex_ui.CountOfCodes; | |
711 | frame_reg = PEX64_UWI_FRAMEREG (ex_ui.FrameRegisterOffset); | |
712 | ||
713 | if (frame_reg != 0) | |
714 | { | |
715 | /* According to msdn: | |
716 | If an FP reg is used, then any unwind code taking an offset must | |
717 | only be used after the FP reg is established in the prolog. */ | |
718 | gdb_byte buf[8]; | |
719 | int frreg = amd64_windows_w2gdb_regnum[frame_reg]; | |
720 | ||
721 | get_frame_register (this_frame, frreg, buf); | |
722 | save_addr = extract_unsigned_integer (buf, 8, byte_order); | |
723 | ||
724 | if (frame_debug) | |
725 | fprintf_unfiltered (gdb_stdlog, " frame_reg=%s, val=%s\n", | |
726 | gdbarch_register_name (gdbarch, frreg), | |
727 | paddress (gdbarch, save_addr)); | |
728 | } | |
729 | ||
730 | /* Read opcodes. */ | |
731 | if (codes_count != 0 | |
732 | && target_read_memory (cache->image_base + unwind_info | |
733 | + sizeof (ex_ui), | |
734 | insns, codes_count * 2) != 0) | |
735 | return; | |
736 | ||
737 | end_insns = &insns[codes_count * 2]; | |
170d82c9 JB |
738 | p = insns; |
739 | ||
740 | /* Skip opcodes 6 of version 2. This opcode is not documented. */ | |
741 | if (PEX64_UWI_VERSION (ex_ui.Version_Flags) == 2) | |
742 | { | |
743 | for (; p < end_insns; p += 2) | |
744 | if (PEX64_UNWCODE_CODE (p[1]) != 6) | |
745 | break; | |
746 | } | |
747 | ||
748 | for (; p < end_insns; p += 2) | |
9058cc3a TG |
749 | { |
750 | int reg; | |
751 | ||
670f82d4 TG |
752 | /* Virtually execute the operation if the pc is after the |
753 | corresponding instruction (that does matter in case of break | |
754 | within the prologue). Note that for chained info (!first), the | |
755 | prologue has been fully executed. */ | |
756 | if (cache->pc >= start + p[0] || cache->pc < start) | |
9058cc3a | 757 | { |
670f82d4 TG |
758 | if (frame_debug) |
759 | fprintf_unfiltered | |
760 | (gdb_stdlog, " op #%u: off=0x%02x, insn=0x%02x\n", | |
761 | (unsigned) (p - insns), p[0], p[1]); | |
762 | ||
9058cc3a TG |
763 | /* If there is no frame registers defined, the current value of |
764 | rsp is used instead. */ | |
765 | if (frame_reg == 0) | |
766 | save_addr = cur_sp; | |
767 | ||
670f82d4 TG |
768 | reg = -1; |
769 | ||
9058cc3a TG |
770 | switch (PEX64_UNWCODE_CODE (p[1])) |
771 | { | |
772 | case UWOP_PUSH_NONVOL: | |
773 | /* Push pre-decrements RSP. */ | |
774 | reg = amd64_windows_w2gdb_regnum[PEX64_UNWCODE_INFO (p[1])]; | |
775 | cache->prev_reg_addr[reg] = cur_sp; | |
776 | cur_sp += 8; | |
777 | break; | |
778 | case UWOP_ALLOC_LARGE: | |
779 | if (PEX64_UNWCODE_INFO (p[1]) == 0) | |
780 | cur_sp += | |
781 | 8 * extract_unsigned_integer (p + 2, 2, byte_order); | |
782 | else if (PEX64_UNWCODE_INFO (p[1]) == 1) | |
783 | cur_sp += extract_unsigned_integer (p + 2, 4, byte_order); | |
784 | else | |
785 | return; | |
786 | break; | |
787 | case UWOP_ALLOC_SMALL: | |
788 | cur_sp += 8 + 8 * PEX64_UNWCODE_INFO (p[1]); | |
789 | break; | |
790 | case UWOP_SET_FPREG: | |
791 | cur_sp = save_addr | |
792 | - PEX64_UWI_FRAMEOFF (ex_ui.FrameRegisterOffset) * 16; | |
793 | break; | |
794 | case UWOP_SAVE_NONVOL: | |
795 | reg = amd64_windows_w2gdb_regnum[PEX64_UNWCODE_INFO (p[1])]; | |
796 | cache->prev_reg_addr[reg] = save_addr | |
670f82d4 | 797 | + 8 * extract_unsigned_integer (p + 2, 2, byte_order); |
9058cc3a TG |
798 | break; |
799 | case UWOP_SAVE_NONVOL_FAR: | |
800 | reg = amd64_windows_w2gdb_regnum[PEX64_UNWCODE_INFO (p[1])]; | |
801 | cache->prev_reg_addr[reg] = save_addr | |
670f82d4 | 802 | + 8 * extract_unsigned_integer (p + 2, 4, byte_order); |
9058cc3a TG |
803 | break; |
804 | case UWOP_SAVE_XMM128: | |
805 | cache->prev_xmm_addr[PEX64_UNWCODE_INFO (p[1])] = | |
806 | save_addr | |
807 | - 16 * extract_unsigned_integer (p + 2, 2, byte_order); | |
808 | break; | |
809 | case UWOP_SAVE_XMM128_FAR: | |
810 | cache->prev_xmm_addr[PEX64_UNWCODE_INFO (p[1])] = | |
811 | save_addr | |
812 | - 16 * extract_unsigned_integer (p + 2, 4, byte_order); | |
813 | break; | |
814 | case UWOP_PUSH_MACHFRAME: | |
815 | if (PEX64_UNWCODE_INFO (p[1]) == 0) | |
816 | { | |
817 | cache->prev_rip_addr = cur_sp + 0; | |
818 | cache->prev_rsp_addr = cur_sp + 24; | |
819 | cur_sp += 40; | |
820 | } | |
821 | else if (PEX64_UNWCODE_INFO (p[1]) == 1) | |
822 | { | |
823 | cache->prev_rip_addr = cur_sp + 8; | |
824 | cache->prev_rsp_addr = cur_sp + 32; | |
825 | cur_sp += 48; | |
826 | } | |
827 | else | |
828 | return; | |
829 | break; | |
830 | default: | |
831 | return; | |
832 | } | |
670f82d4 TG |
833 | |
834 | /* Display address where the register was saved. */ | |
835 | if (frame_debug && reg >= 0) | |
836 | fprintf_unfiltered | |
837 | (gdb_stdlog, " [reg %s at %s]\n", | |
838 | gdbarch_register_name (gdbarch, reg), | |
839 | paddress (gdbarch, cache->prev_reg_addr[reg])); | |
9058cc3a TG |
840 | } |
841 | ||
842 | /* Adjust with the length of the opcode. */ | |
843 | switch (PEX64_UNWCODE_CODE (p[1])) | |
844 | { | |
845 | case UWOP_PUSH_NONVOL: | |
846 | case UWOP_ALLOC_SMALL: | |
847 | case UWOP_SET_FPREG: | |
848 | case UWOP_PUSH_MACHFRAME: | |
849 | break; | |
850 | case UWOP_ALLOC_LARGE: | |
851 | if (PEX64_UNWCODE_INFO (p[1]) == 0) | |
852 | p += 2; | |
853 | else if (PEX64_UNWCODE_INFO (p[1]) == 1) | |
854 | p += 4; | |
855 | else | |
856 | return; | |
857 | break; | |
858 | case UWOP_SAVE_NONVOL: | |
859 | case UWOP_SAVE_XMM128: | |
860 | p += 2; | |
861 | break; | |
862 | case UWOP_SAVE_NONVOL_FAR: | |
863 | case UWOP_SAVE_XMM128_FAR: | |
864 | p += 4; | |
865 | break; | |
866 | default: | |
867 | return; | |
868 | } | |
869 | } | |
870 | if (PEX64_UWI_FLAGS (ex_ui.Version_Flags) != UNW_FLAG_CHAININFO) | |
670f82d4 TG |
871 | { |
872 | /* End of unwind info. */ | |
873 | break; | |
874 | } | |
9058cc3a TG |
875 | else |
876 | { | |
877 | /* Read the chained unwind info. */ | |
878 | struct external_pex64_runtime_function d; | |
879 | CORE_ADDR chain_vma; | |
880 | ||
670f82d4 TG |
881 | /* Not anymore the first entry. */ |
882 | first = 0; | |
883 | ||
884 | /* Stay aligned on word boundary. */ | |
9058cc3a | 885 | chain_vma = cache->image_base + unwind_info |
e068c55d | 886 | + sizeof (ex_ui) + ((codes_count + 1) & ~1) * 2; |
9058cc3a TG |
887 | |
888 | if (target_read_memory (chain_vma, (gdb_byte *) &d, sizeof (d)) != 0) | |
889 | return; | |
890 | ||
670f82d4 TG |
891 | /* Decode begin/end. This may be different from .pdata index, as |
892 | an unwind info may be shared by several functions (in particular | |
893 | if many functions have the same prolog and handler. */ | |
9058cc3a TG |
894 | cache->start_rva = |
895 | extract_unsigned_integer (d.rva_BeginAddress, 4, byte_order); | |
896 | cache->end_rva = | |
897 | extract_unsigned_integer (d.rva_EndAddress, 4, byte_order); | |
898 | unwind_info = | |
899 | extract_unsigned_integer (d.rva_UnwindData, 4, byte_order); | |
53e8f97d JB |
900 | |
901 | if (frame_debug) | |
902 | fprintf_unfiltered | |
903 | (gdb_stdlog, | |
904 | "amd64_windows_frame_decodes_insn (next in chain):" | |
905 | " unwind_data=%s, start_rva=%s, end_rva=%s\n", | |
906 | paddress (gdbarch, unwind_info), | |
907 | paddress (gdbarch, cache->start_rva), | |
908 | paddress (gdbarch, cache->end_rva)); | |
9058cc3a TG |
909 | } |
910 | ||
911 | /* Allow the user to break this loop. */ | |
912 | QUIT; | |
913 | } | |
914 | /* PC is saved by the call. */ | |
915 | if (cache->prev_rip_addr == 0) | |
916 | cache->prev_rip_addr = cur_sp; | |
917 | cache->prev_sp = cur_sp + 8; | |
918 | ||
919 | if (frame_debug) | |
920 | fprintf_unfiltered (gdb_stdlog, " prev_sp: %s, prev_pc @%s\n", | |
921 | paddress (gdbarch, cache->prev_sp), | |
922 | paddress (gdbarch, cache->prev_rip_addr)); | |
923 | } | |
924 | ||
925 | /* Find SEH unwind info for PC, returning 0 on success. | |
926 | ||
927 | UNWIND_INFO is set to the rva of unwind info address, IMAGE_BASE | |
928 | to the base address of the corresponding image, and START_RVA | |
929 | to the rva of the function containing PC. */ | |
930 | ||
931 | static int | |
932 | amd64_windows_find_unwind_info (struct gdbarch *gdbarch, CORE_ADDR pc, | |
933 | CORE_ADDR *unwind_info, | |
934 | CORE_ADDR *image_base, | |
935 | CORE_ADDR *start_rva, | |
936 | CORE_ADDR *end_rva) | |
937 | { | |
938 | struct obj_section *sec; | |
939 | pe_data_type *pe; | |
940 | IMAGE_DATA_DIRECTORY *dir; | |
941 | struct objfile *objfile; | |
942 | unsigned long lo, hi; | |
943 | CORE_ADDR base; | |
944 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
945 | ||
946 | /* Get the corresponding exception directory. */ | |
947 | sec = find_pc_section (pc); | |
948 | if (sec == NULL) | |
949 | return -1; | |
950 | objfile = sec->objfile; | |
951 | pe = pe_data (sec->objfile->obfd); | |
952 | dir = &pe->pe_opthdr.DataDirectory[PE_EXCEPTION_TABLE]; | |
953 | ||
954 | base = pe->pe_opthdr.ImageBase | |
955 | + ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); | |
956 | *image_base = base; | |
957 | ||
958 | /* Find the entry. | |
959 | ||
960 | Note: This does not handle dynamically added entries (for JIT | |
961 | engines). For this, we would need to ask the kernel directly, | |
962 | which means getting some info from the native layer. For the | |
963 | rest of the code, however, it's probably faster to search | |
964 | the entry ourselves. */ | |
965 | lo = 0; | |
966 | hi = dir->Size / sizeof (struct external_pex64_runtime_function); | |
967 | *unwind_info = 0; | |
968 | while (lo <= hi) | |
969 | { | |
970 | unsigned long mid = lo + (hi - lo) / 2; | |
971 | struct external_pex64_runtime_function d; | |
972 | CORE_ADDR sa, ea; | |
973 | ||
974 | if (target_read_memory (base + dir->VirtualAddress + mid * sizeof (d), | |
975 | (gdb_byte *) &d, sizeof (d)) != 0) | |
976 | return -1; | |
977 | ||
978 | sa = extract_unsigned_integer (d.rva_BeginAddress, 4, byte_order); | |
979 | ea = extract_unsigned_integer (d.rva_EndAddress, 4, byte_order); | |
980 | if (pc < base + sa) | |
981 | hi = mid - 1; | |
982 | else if (pc >= base + ea) | |
983 | lo = mid + 1; | |
984 | else if (pc >= base + sa && pc < base + ea) | |
985 | { | |
986 | /* Got it. */ | |
987 | *start_rva = sa; | |
988 | *end_rva = ea; | |
989 | *unwind_info = | |
990 | extract_unsigned_integer (d.rva_UnwindData, 4, byte_order); | |
991 | break; | |
992 | } | |
993 | else | |
994 | break; | |
995 | } | |
996 | ||
997 | if (frame_debug) | |
998 | fprintf_unfiltered | |
999 | (gdb_stdlog, | |
1000 | "amd64_windows_find_unwind_data: image_base=%s, unwind_data=%s\n", | |
1001 | paddress (gdbarch, base), paddress (gdbarch, *unwind_info)); | |
1002 | ||
9058cc3a TG |
1003 | return 0; |
1004 | } | |
1005 | ||
1006 | /* Fill THIS_CACHE using the native amd64-windows unwinding data | |
1007 | for THIS_FRAME. */ | |
1008 | ||
1009 | static struct amd64_windows_frame_cache * | |
1010 | amd64_windows_frame_cache (struct frame_info *this_frame, void **this_cache) | |
1011 | { | |
1012 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
1013 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1014 | struct amd64_windows_frame_cache *cache; | |
1015 | gdb_byte buf[8]; | |
9058cc3a | 1016 | CORE_ADDR pc; |
9058cc3a TG |
1017 | CORE_ADDR unwind_info = 0; |
1018 | ||
1019 | if (*this_cache) | |
9a3c8263 | 1020 | return (struct amd64_windows_frame_cache *) *this_cache; |
9058cc3a TG |
1021 | |
1022 | cache = FRAME_OBSTACK_ZALLOC (struct amd64_windows_frame_cache); | |
1023 | *this_cache = cache; | |
1024 | ||
1025 | /* Get current PC and SP. */ | |
1026 | pc = get_frame_pc (this_frame); | |
1027 | get_frame_register (this_frame, AMD64_RSP_REGNUM, buf); | |
1028 | cache->sp = extract_unsigned_integer (buf, 8, byte_order); | |
1029 | cache->pc = pc; | |
1030 | ||
1031 | if (amd64_windows_find_unwind_info (gdbarch, pc, &unwind_info, | |
1032 | &cache->image_base, | |
1033 | &cache->start_rva, | |
1034 | &cache->end_rva)) | |
1035 | return cache; | |
1036 | ||
1037 | if (unwind_info == 0) | |
1038 | { | |
1039 | /* Assume a leaf function. */ | |
1040 | cache->prev_sp = cache->sp + 8; | |
1041 | cache->prev_rip_addr = cache->sp; | |
1042 | } | |
1043 | else | |
1044 | { | |
1045 | /* Decode unwind insns to compute saved addresses. */ | |
1046 | amd64_windows_frame_decode_insns (this_frame, cache, unwind_info); | |
1047 | } | |
1048 | return cache; | |
1049 | } | |
1050 | ||
1051 | /* Implement the "prev_register" method of struct frame_unwind | |
1052 | using the standard Windows x64 SEH info. */ | |
1053 | ||
1054 | static struct value * | |
1055 | amd64_windows_frame_prev_register (struct frame_info *this_frame, | |
1056 | void **this_cache, int regnum) | |
1057 | { | |
1058 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
9058cc3a TG |
1059 | struct amd64_windows_frame_cache *cache = |
1060 | amd64_windows_frame_cache (this_frame, this_cache); | |
9058cc3a TG |
1061 | CORE_ADDR prev; |
1062 | ||
1063 | if (frame_debug) | |
1064 | fprintf_unfiltered (gdb_stdlog, | |
1065 | "amd64_windows_frame_prev_register %s for sp=%s\n", | |
1066 | gdbarch_register_name (gdbarch, regnum), | |
1067 | paddress (gdbarch, cache->prev_sp)); | |
1068 | ||
1069 | if (regnum >= AMD64_XMM0_REGNUM && regnum <= AMD64_XMM0_REGNUM + 15) | |
1070 | prev = cache->prev_xmm_addr[regnum - AMD64_XMM0_REGNUM]; | |
1071 | else if (regnum == AMD64_RSP_REGNUM) | |
1072 | { | |
1073 | prev = cache->prev_rsp_addr; | |
1074 | if (prev == 0) | |
1075 | return frame_unwind_got_constant (this_frame, regnum, cache->prev_sp); | |
1076 | } | |
1077 | else if (regnum >= AMD64_RAX_REGNUM && regnum <= AMD64_R15_REGNUM) | |
1078 | prev = cache->prev_reg_addr[regnum - AMD64_RAX_REGNUM]; | |
1079 | else if (regnum == AMD64_RIP_REGNUM) | |
1080 | prev = cache->prev_rip_addr; | |
1081 | else | |
1082 | prev = 0; | |
1083 | ||
1084 | if (prev && frame_debug) | |
1085 | fprintf_unfiltered (gdb_stdlog, " -> at %s\n", paddress (gdbarch, prev)); | |
1086 | ||
1087 | if (prev) | |
1088 | { | |
1089 | /* Register was saved. */ | |
1090 | return frame_unwind_got_memory (this_frame, regnum, prev); | |
1091 | } | |
1092 | else | |
1093 | { | |
1094 | /* Register is either volatile or not modified. */ | |
1095 | return frame_unwind_got_register (this_frame, regnum, regnum); | |
1096 | } | |
1097 | } | |
1098 | ||
1099 | /* Implement the "this_id" method of struct frame_unwind using | |
1100 | the standard Windows x64 SEH info. */ | |
1101 | ||
1102 | static void | |
1103 | amd64_windows_frame_this_id (struct frame_info *this_frame, void **this_cache, | |
1104 | struct frame_id *this_id) | |
1105 | { | |
9058cc3a TG |
1106 | struct amd64_windows_frame_cache *cache = |
1107 | amd64_windows_frame_cache (this_frame, this_cache); | |
1108 | ||
1109 | *this_id = frame_id_build (cache->prev_sp, | |
1110 | cache->image_base + cache->start_rva); | |
1111 | } | |
1112 | ||
1113 | /* Windows x64 SEH unwinder. */ | |
1114 | ||
1115 | static const struct frame_unwind amd64_windows_frame_unwind = | |
1116 | { | |
1117 | NORMAL_FRAME, | |
1118 | default_frame_unwind_stop_reason, | |
1119 | &amd64_windows_frame_this_id, | |
1120 | &amd64_windows_frame_prev_register, | |
1121 | NULL, | |
1122 | default_frame_sniffer | |
1123 | }; | |
1124 | ||
1125 | /* Implement the "skip_prologue" gdbarch method. */ | |
1126 | ||
1127 | static CORE_ADDR | |
1128 | amd64_windows_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) | |
1129 | { | |
1130 | CORE_ADDR func_addr; | |
1131 | CORE_ADDR unwind_info = 0; | |
1132 | CORE_ADDR image_base, start_rva, end_rva; | |
1133 | struct external_pex64_unwind_info ex_ui; | |
1134 | ||
1135 | /* Use prologue size from unwind info. */ | |
1136 | if (amd64_windows_find_unwind_info (gdbarch, pc, &unwind_info, | |
1137 | &image_base, &start_rva, &end_rva) == 0) | |
1138 | { | |
1139 | if (unwind_info == 0) | |
1140 | { | |
1141 | /* Leaf function. */ | |
1142 | return pc; | |
1143 | } | |
1144 | else if (target_read_memory (image_base + unwind_info, | |
1145 | (gdb_byte *) &ex_ui, sizeof (ex_ui)) == 0 | |
1146 | && PEX64_UWI_VERSION (ex_ui.Version_Flags) == 1) | |
325fac50 | 1147 | return std::max (pc, image_base + start_rva + ex_ui.SizeOfPrologue); |
9058cc3a TG |
1148 | } |
1149 | ||
1150 | /* See if we can determine the end of the prologue via the symbol | |
1151 | table. If so, then return either the PC, or the PC after | |
1152 | the prologue, whichever is greater. */ | |
1153 | if (find_pc_partial_function (pc, NULL, &func_addr, NULL)) | |
1154 | { | |
1155 | CORE_ADDR post_prologue_pc | |
1156 | = skip_prologue_using_sal (gdbarch, func_addr); | |
1157 | ||
1158 | if (post_prologue_pc != 0) | |
325fac50 | 1159 | return std::max (pc, post_prologue_pc); |
9058cc3a TG |
1160 | } |
1161 | ||
1162 | return pc; | |
1163 | } | |
1164 | ||
84552b16 PA |
1165 | /* Check Win64 DLL jmp trampolines and find jump destination. */ |
1166 | ||
1167 | static CORE_ADDR | |
1168 | amd64_windows_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) | |
1169 | { | |
1170 | CORE_ADDR destination = 0; | |
1171 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
1172 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1173 | ||
1174 | /* Check for jmp *<offset>(%rip) (jump near, absolute indirect (/4)). */ | |
1175 | if (pc && read_memory_unsigned_integer (pc, 2, byte_order) == 0x25ff) | |
1176 | { | |
1177 | /* Get opcode offset and see if we can find a reference in our data. */ | |
1178 | ULONGEST offset | |
1179 | = read_memory_unsigned_integer (pc + 2, 4, byte_order); | |
1180 | ||
1181 | /* Get address of function pointer at end of pc. */ | |
1182 | CORE_ADDR indirect_addr = pc + offset + 6; | |
1183 | ||
1184 | struct minimal_symbol *indsym | |
7cbd4a93 TT |
1185 | = (indirect_addr |
1186 | ? lookup_minimal_symbol_by_pc (indirect_addr).minsym | |
1187 | : NULL); | |
efd66ac6 | 1188 | const char *symname = indsym ? MSYMBOL_LINKAGE_NAME (indsym) : NULL; |
84552b16 PA |
1189 | |
1190 | if (symname) | |
1191 | { | |
61012eef GB |
1192 | if (startswith (symname, "__imp_") |
1193 | || startswith (symname, "_imp_")) | |
84552b16 PA |
1194 | destination |
1195 | = read_memory_unsigned_integer (indirect_addr, 8, byte_order); | |
1196 | } | |
1197 | } | |
1198 | ||
1199 | return destination; | |
1200 | } | |
99e24b90 | 1201 | |
83ab93c6 JB |
1202 | /* Implement the "auto_wide_charset" gdbarch method. */ |
1203 | ||
1204 | static const char * | |
1205 | amd64_windows_auto_wide_charset (void) | |
1206 | { | |
1207 | return "UTF-16"; | |
1208 | } | |
1209 | ||
d0761299 JB |
1210 | static void |
1211 | amd64_windows_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1212 | { | |
9058cc3a TG |
1213 | /* The dwarf2 unwinder (appended very early by i386_gdbarch_init) is |
1214 | preferred over the SEH one. The reasons are: | |
1215 | - binaries without SEH but with dwarf2 debug info are correcly handled | |
1216 | (although they aren't ABI compliant, gcc before 4.7 didn't emit SEH | |
1217 | info). | |
1218 | - dwarf3 DW_OP_call_frame_cfa is correctly handled (it can only be | |
1219 | handled if the dwarf2 unwinder is used). | |
1220 | ||
1221 | The call to amd64_init_abi appends default unwinders, that aren't | |
1222 | compatible with the SEH one. | |
1223 | */ | |
1224 | frame_unwind_append_unwinder (gdbarch, &amd64_windows_frame_unwind); | |
1225 | ||
d0761299 JB |
1226 | amd64_init_abi (info, gdbarch); |
1227 | ||
64870a42 YQ |
1228 | windows_init_abi (info, gdbarch); |
1229 | ||
d0761299 JB |
1230 | /* On Windows, "long"s are only 32bit. */ |
1231 | set_gdbarch_long_bit (gdbarch, 32); | |
1232 | ||
ba581dc1 | 1233 | /* Function calls. */ |
20c2e3e0 | 1234 | set_gdbarch_push_dummy_call (gdbarch, amd64_windows_push_dummy_call); |
cba6fab5 | 1235 | set_gdbarch_return_value (gdbarch, amd64_windows_return_value); |
99e24b90 | 1236 | set_gdbarch_skip_main_prologue (gdbarch, amd64_skip_main_prologue); |
84552b16 PA |
1237 | set_gdbarch_skip_trampoline_code (gdbarch, |
1238 | amd64_windows_skip_trampoline_code); | |
ba581dc1 | 1239 | |
9058cc3a TG |
1240 | set_gdbarch_skip_prologue (gdbarch, amd64_windows_skip_prologue); |
1241 | ||
83ab93c6 | 1242 | set_gdbarch_auto_wide_charset (gdbarch, amd64_windows_auto_wide_charset); |
d0761299 JB |
1243 | } |
1244 | ||
693be288 JK |
1245 | /* -Wmissing-prototypes */ |
1246 | extern initialize_file_ftype _initialize_amd64_windows_tdep; | |
1247 | ||
d0761299 JB |
1248 | void |
1249 | _initialize_amd64_windows_tdep (void) | |
1250 | { | |
1251 | gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, GDB_OSABI_CYGWIN, | |
1252 | amd64_windows_init_abi); | |
1253 | } |