Commit | Line | Data |
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02d27625 MM |
1 | /* Branch trace support for GDB, the GNU debugger. |
2 | ||
42a4f53d | 3 | Copyright (C) 2013-2019 Free Software Foundation, Inc. |
02d27625 MM |
4 | |
5 | Contributed by Intel Corp. <markus.t.metzger@intel.com> | |
6 | ||
7 | This file is part of GDB. | |
8 | ||
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 3 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
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. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
21 | ||
d41f6d8e | 22 | #include "defs.h" |
02d27625 MM |
23 | #include "btrace.h" |
24 | #include "gdbthread.h" | |
02d27625 | 25 | #include "inferior.h" |
4de283e4 | 26 | #include "target.h" |
02d27625 | 27 | #include "record.h" |
d55e5aa6 | 28 | #include "symtab.h" |
4de283e4 TT |
29 | #include "disasm.h" |
30 | #include "source.h" | |
31 | #include "filenames.h" | |
c12a2917 | 32 | #include "xml-support.h" |
4de283e4 TT |
33 | #include "regcache.h" |
34 | #include "common/rsp-low.h" | |
35 | #include "gdbcmd.h" | |
36 | #include "cli/cli-utils.h" | |
b20a6524 | 37 | |
4a4495d6 MM |
38 | /* For maintenance commands. */ |
39 | #include "record-btrace.h" | |
40 | ||
b20a6524 | 41 | #include <inttypes.h> |
b0627500 | 42 | #include <ctype.h> |
325fac50 | 43 | #include <algorithm> |
b0627500 MM |
44 | |
45 | /* Command lists for btrace maintenance commands. */ | |
46 | static struct cmd_list_element *maint_btrace_cmdlist; | |
47 | static struct cmd_list_element *maint_btrace_set_cmdlist; | |
48 | static struct cmd_list_element *maint_btrace_show_cmdlist; | |
49 | static struct cmd_list_element *maint_btrace_pt_set_cmdlist; | |
50 | static struct cmd_list_element *maint_btrace_pt_show_cmdlist; | |
51 | ||
52 | /* Control whether to skip PAD packets when computing the packet history. */ | |
53 | static int maint_btrace_pt_skip_pad = 1; | |
b20a6524 MM |
54 | |
55 | static void btrace_add_pc (struct thread_info *tp); | |
02d27625 MM |
56 | |
57 | /* Print a record debug message. Use do ... while (0) to avoid ambiguities | |
58 | when used in if statements. */ | |
59 | ||
60 | #define DEBUG(msg, args...) \ | |
61 | do \ | |
62 | { \ | |
63 | if (record_debug != 0) \ | |
64 | fprintf_unfiltered (gdb_stdlog, \ | |
65 | "[btrace] " msg "\n", ##args); \ | |
66 | } \ | |
67 | while (0) | |
68 | ||
69 | #define DEBUG_FTRACE(msg, args...) DEBUG ("[ftrace] " msg, ##args) | |
70 | ||
02d27625 MM |
71 | /* Return the function name of a recorded function segment for printing. |
72 | This function never returns NULL. */ | |
73 | ||
74 | static const char * | |
23a7fe75 | 75 | ftrace_print_function_name (const struct btrace_function *bfun) |
02d27625 MM |
76 | { |
77 | struct minimal_symbol *msym; | |
78 | struct symbol *sym; | |
79 | ||
80 | msym = bfun->msym; | |
81 | sym = bfun->sym; | |
82 | ||
83 | if (sym != NULL) | |
84 | return SYMBOL_PRINT_NAME (sym); | |
85 | ||
86 | if (msym != NULL) | |
efd66ac6 | 87 | return MSYMBOL_PRINT_NAME (msym); |
02d27625 MM |
88 | |
89 | return "<unknown>"; | |
90 | } | |
91 | ||
92 | /* Return the file name of a recorded function segment for printing. | |
93 | This function never returns NULL. */ | |
94 | ||
95 | static const char * | |
23a7fe75 | 96 | ftrace_print_filename (const struct btrace_function *bfun) |
02d27625 MM |
97 | { |
98 | struct symbol *sym; | |
99 | const char *filename; | |
100 | ||
101 | sym = bfun->sym; | |
102 | ||
103 | if (sym != NULL) | |
08be3fe3 | 104 | filename = symtab_to_filename_for_display (symbol_symtab (sym)); |
02d27625 MM |
105 | else |
106 | filename = "<unknown>"; | |
107 | ||
108 | return filename; | |
109 | } | |
110 | ||
23a7fe75 MM |
111 | /* Return a string representation of the address of an instruction. |
112 | This function never returns NULL. */ | |
02d27625 | 113 | |
23a7fe75 MM |
114 | static const char * |
115 | ftrace_print_insn_addr (const struct btrace_insn *insn) | |
02d27625 | 116 | { |
23a7fe75 MM |
117 | if (insn == NULL) |
118 | return "<nil>"; | |
119 | ||
120 | return core_addr_to_string_nz (insn->pc); | |
02d27625 MM |
121 | } |
122 | ||
23a7fe75 | 123 | /* Print an ftrace debug status message. */ |
02d27625 MM |
124 | |
125 | static void | |
23a7fe75 | 126 | ftrace_debug (const struct btrace_function *bfun, const char *prefix) |
02d27625 | 127 | { |
23a7fe75 MM |
128 | const char *fun, *file; |
129 | unsigned int ibegin, iend; | |
ce0dfbea | 130 | int level; |
23a7fe75 MM |
131 | |
132 | fun = ftrace_print_function_name (bfun); | |
133 | file = ftrace_print_filename (bfun); | |
134 | level = bfun->level; | |
135 | ||
23a7fe75 | 136 | ibegin = bfun->insn_offset; |
0860c437 | 137 | iend = ibegin + bfun->insn.size (); |
23a7fe75 | 138 | |
ce0dfbea MM |
139 | DEBUG_FTRACE ("%s: fun = %s, file = %s, level = %d, insn = [%u; %u)", |
140 | prefix, fun, file, level, ibegin, iend); | |
02d27625 MM |
141 | } |
142 | ||
69090cee TW |
143 | /* Return the number of instructions in a given function call segment. */ |
144 | ||
145 | static unsigned int | |
146 | ftrace_call_num_insn (const struct btrace_function* bfun) | |
147 | { | |
148 | if (bfun == NULL) | |
149 | return 0; | |
150 | ||
151 | /* A gap is always counted as one instruction. */ | |
152 | if (bfun->errcode != 0) | |
153 | return 1; | |
154 | ||
0860c437 | 155 | return bfun->insn.size (); |
69090cee TW |
156 | } |
157 | ||
42bfe59e TW |
158 | /* Return the function segment with the given NUMBER or NULL if no such segment |
159 | exists. BTINFO is the branch trace information for the current thread. */ | |
160 | ||
161 | static struct btrace_function * | |
08c3f6d2 TW |
162 | ftrace_find_call_by_number (struct btrace_thread_info *btinfo, |
163 | unsigned int number) | |
164 | { | |
165 | if (number == 0 || number > btinfo->functions.size ()) | |
166 | return NULL; | |
167 | ||
168 | return &btinfo->functions[number - 1]; | |
169 | } | |
170 | ||
171 | /* A const version of the function above. */ | |
172 | ||
173 | static const struct btrace_function * | |
42bfe59e TW |
174 | ftrace_find_call_by_number (const struct btrace_thread_info *btinfo, |
175 | unsigned int number) | |
176 | { | |
177 | if (number == 0 || number > btinfo->functions.size ()) | |
178 | return NULL; | |
179 | ||
08c3f6d2 | 180 | return &btinfo->functions[number - 1]; |
42bfe59e TW |
181 | } |
182 | ||
23a7fe75 MM |
183 | /* Return non-zero if BFUN does not match MFUN and FUN, |
184 | return zero otherwise. */ | |
02d27625 MM |
185 | |
186 | static int | |
23a7fe75 MM |
187 | ftrace_function_switched (const struct btrace_function *bfun, |
188 | const struct minimal_symbol *mfun, | |
189 | const struct symbol *fun) | |
02d27625 MM |
190 | { |
191 | struct minimal_symbol *msym; | |
192 | struct symbol *sym; | |
193 | ||
02d27625 MM |
194 | msym = bfun->msym; |
195 | sym = bfun->sym; | |
196 | ||
197 | /* If the minimal symbol changed, we certainly switched functions. */ | |
198 | if (mfun != NULL && msym != NULL | |
efd66ac6 | 199 | && strcmp (MSYMBOL_LINKAGE_NAME (mfun), MSYMBOL_LINKAGE_NAME (msym)) != 0) |
02d27625 MM |
200 | return 1; |
201 | ||
202 | /* If the symbol changed, we certainly switched functions. */ | |
203 | if (fun != NULL && sym != NULL) | |
204 | { | |
205 | const char *bfname, *fname; | |
206 | ||
207 | /* Check the function name. */ | |
208 | if (strcmp (SYMBOL_LINKAGE_NAME (fun), SYMBOL_LINKAGE_NAME (sym)) != 0) | |
209 | return 1; | |
210 | ||
211 | /* Check the location of those functions, as well. */ | |
08be3fe3 DE |
212 | bfname = symtab_to_fullname (symbol_symtab (sym)); |
213 | fname = symtab_to_fullname (symbol_symtab (fun)); | |
02d27625 MM |
214 | if (filename_cmp (fname, bfname) != 0) |
215 | return 1; | |
216 | } | |
217 | ||
23a7fe75 MM |
218 | /* If we lost symbol information, we switched functions. */ |
219 | if (!(msym == NULL && sym == NULL) && mfun == NULL && fun == NULL) | |
220 | return 1; | |
221 | ||
222 | /* If we gained symbol information, we switched functions. */ | |
223 | if (msym == NULL && sym == NULL && !(mfun == NULL && fun == NULL)) | |
224 | return 1; | |
225 | ||
02d27625 MM |
226 | return 0; |
227 | } | |
228 | ||
8286623c TW |
229 | /* Allocate and initialize a new branch trace function segment at the end of |
230 | the trace. | |
17b89b34 | 231 | BTINFO is the branch trace information for the current thread. |
08c3f6d2 TW |
232 | MFUN and FUN are the symbol information we have for this function. |
233 | This invalidates all struct btrace_function pointer currently held. */ | |
23a7fe75 MM |
234 | |
235 | static struct btrace_function * | |
17b89b34 | 236 | ftrace_new_function (struct btrace_thread_info *btinfo, |
23a7fe75 MM |
237 | struct minimal_symbol *mfun, |
238 | struct symbol *fun) | |
239 | { | |
08c3f6d2 TW |
240 | int level; |
241 | unsigned int number, insn_offset; | |
23a7fe75 | 242 | |
b54b03bd | 243 | if (btinfo->functions.empty ()) |
5de9129b | 244 | { |
08c3f6d2 TW |
245 | /* Start counting NUMBER and INSN_OFFSET at one. */ |
246 | level = 0; | |
247 | number = 1; | |
248 | insn_offset = 1; | |
5de9129b MM |
249 | } |
250 | else | |
23a7fe75 | 251 | { |
08c3f6d2 TW |
252 | const struct btrace_function *prev = &btinfo->functions.back (); |
253 | level = prev->level; | |
254 | number = prev->number + 1; | |
255 | insn_offset = prev->insn_offset + ftrace_call_num_insn (prev); | |
23a7fe75 MM |
256 | } |
257 | ||
08c3f6d2 TW |
258 | btinfo->functions.emplace_back (mfun, fun, number, insn_offset, level); |
259 | return &btinfo->functions.back (); | |
02d27625 MM |
260 | } |
261 | ||
23a7fe75 | 262 | /* Update the UP field of a function segment. */ |
02d27625 | 263 | |
23a7fe75 MM |
264 | static void |
265 | ftrace_update_caller (struct btrace_function *bfun, | |
266 | struct btrace_function *caller, | |
267 | enum btrace_function_flag flags) | |
02d27625 | 268 | { |
42bfe59e | 269 | if (bfun->up != 0) |
23a7fe75 | 270 | ftrace_debug (bfun, "updating caller"); |
02d27625 | 271 | |
42bfe59e | 272 | bfun->up = caller->number; |
23a7fe75 MM |
273 | bfun->flags = flags; |
274 | ||
275 | ftrace_debug (bfun, "set caller"); | |
d87fdac3 | 276 | ftrace_debug (caller, "..to"); |
23a7fe75 MM |
277 | } |
278 | ||
279 | /* Fix up the caller for all segments of a function. */ | |
280 | ||
281 | static void | |
4aeb0dfc TW |
282 | ftrace_fixup_caller (struct btrace_thread_info *btinfo, |
283 | struct btrace_function *bfun, | |
23a7fe75 MM |
284 | struct btrace_function *caller, |
285 | enum btrace_function_flag flags) | |
286 | { | |
4aeb0dfc | 287 | unsigned int prev, next; |
23a7fe75 | 288 | |
4aeb0dfc TW |
289 | prev = bfun->prev; |
290 | next = bfun->next; | |
23a7fe75 MM |
291 | ftrace_update_caller (bfun, caller, flags); |
292 | ||
293 | /* Update all function segments belonging to the same function. */ | |
4aeb0dfc TW |
294 | for (; prev != 0; prev = bfun->prev) |
295 | { | |
296 | bfun = ftrace_find_call_by_number (btinfo, prev); | |
297 | ftrace_update_caller (bfun, caller, flags); | |
298 | } | |
23a7fe75 | 299 | |
4aeb0dfc TW |
300 | for (; next != 0; next = bfun->next) |
301 | { | |
302 | bfun = ftrace_find_call_by_number (btinfo, next); | |
303 | ftrace_update_caller (bfun, caller, flags); | |
304 | } | |
23a7fe75 MM |
305 | } |
306 | ||
8286623c | 307 | /* Add a new function segment for a call at the end of the trace. |
17b89b34 | 308 | BTINFO is the branch trace information for the current thread. |
23a7fe75 MM |
309 | MFUN and FUN are the symbol information we have for this function. */ |
310 | ||
311 | static struct btrace_function * | |
17b89b34 | 312 | ftrace_new_call (struct btrace_thread_info *btinfo, |
23a7fe75 MM |
313 | struct minimal_symbol *mfun, |
314 | struct symbol *fun) | |
315 | { | |
b54b03bd | 316 | const unsigned int length = btinfo->functions.size (); |
8286623c | 317 | struct btrace_function *bfun = ftrace_new_function (btinfo, mfun, fun); |
23a7fe75 | 318 | |
42bfe59e | 319 | bfun->up = length; |
31fd9caa | 320 | bfun->level += 1; |
23a7fe75 MM |
321 | |
322 | ftrace_debug (bfun, "new call"); | |
323 | ||
324 | return bfun; | |
325 | } | |
326 | ||
8286623c | 327 | /* Add a new function segment for a tail call at the end of the trace. |
17b89b34 | 328 | BTINFO is the branch trace information for the current thread. |
23a7fe75 MM |
329 | MFUN and FUN are the symbol information we have for this function. */ |
330 | ||
331 | static struct btrace_function * | |
17b89b34 | 332 | ftrace_new_tailcall (struct btrace_thread_info *btinfo, |
23a7fe75 MM |
333 | struct minimal_symbol *mfun, |
334 | struct symbol *fun) | |
335 | { | |
b54b03bd | 336 | const unsigned int length = btinfo->functions.size (); |
8286623c | 337 | struct btrace_function *bfun = ftrace_new_function (btinfo, mfun, fun); |
02d27625 | 338 | |
42bfe59e | 339 | bfun->up = length; |
31fd9caa | 340 | bfun->level += 1; |
23a7fe75 | 341 | bfun->flags |= BFUN_UP_LINKS_TO_TAILCALL; |
02d27625 | 342 | |
23a7fe75 MM |
343 | ftrace_debug (bfun, "new tail call"); |
344 | ||
345 | return bfun; | |
346 | } | |
347 | ||
d87fdac3 | 348 | /* Return the caller of BFUN or NULL if there is none. This function skips |
42bfe59e TW |
349 | tail calls in the call chain. BTINFO is the branch trace information for |
350 | the current thread. */ | |
d87fdac3 | 351 | static struct btrace_function * |
42bfe59e TW |
352 | ftrace_get_caller (struct btrace_thread_info *btinfo, |
353 | struct btrace_function *bfun) | |
d87fdac3 | 354 | { |
42bfe59e | 355 | for (; bfun != NULL; bfun = ftrace_find_call_by_number (btinfo, bfun->up)) |
d87fdac3 | 356 | if ((bfun->flags & BFUN_UP_LINKS_TO_TAILCALL) == 0) |
42bfe59e | 357 | return ftrace_find_call_by_number (btinfo, bfun->up); |
d87fdac3 MM |
358 | |
359 | return NULL; | |
360 | } | |
361 | ||
23a7fe75 | 362 | /* Find the innermost caller in the back trace of BFUN with MFUN/FUN |
42bfe59e TW |
363 | symbol information. BTINFO is the branch trace information for the current |
364 | thread. */ | |
23a7fe75 MM |
365 | |
366 | static struct btrace_function * | |
42bfe59e TW |
367 | ftrace_find_caller (struct btrace_thread_info *btinfo, |
368 | struct btrace_function *bfun, | |
23a7fe75 MM |
369 | struct minimal_symbol *mfun, |
370 | struct symbol *fun) | |
371 | { | |
42bfe59e | 372 | for (; bfun != NULL; bfun = ftrace_find_call_by_number (btinfo, bfun->up)) |
23a7fe75 MM |
373 | { |
374 | /* Skip functions with incompatible symbol information. */ | |
375 | if (ftrace_function_switched (bfun, mfun, fun)) | |
376 | continue; | |
377 | ||
378 | /* This is the function segment we're looking for. */ | |
379 | break; | |
380 | } | |
381 | ||
382 | return bfun; | |
383 | } | |
384 | ||
385 | /* Find the innermost caller in the back trace of BFUN, skipping all | |
386 | function segments that do not end with a call instruction (e.g. | |
42bfe59e TW |
387 | tail calls ending with a jump). BTINFO is the branch trace information for |
388 | the current thread. */ | |
23a7fe75 MM |
389 | |
390 | static struct btrace_function * | |
42bfe59e TW |
391 | ftrace_find_call (struct btrace_thread_info *btinfo, |
392 | struct btrace_function *bfun) | |
23a7fe75 | 393 | { |
42bfe59e | 394 | for (; bfun != NULL; bfun = ftrace_find_call_by_number (btinfo, bfun->up)) |
02d27625 | 395 | { |
31fd9caa MM |
396 | /* Skip gaps. */ |
397 | if (bfun->errcode != 0) | |
398 | continue; | |
23a7fe75 | 399 | |
0860c437 | 400 | btrace_insn &last = bfun->insn.back (); |
02d27625 | 401 | |
0860c437 | 402 | if (last.iclass == BTRACE_INSN_CALL) |
23a7fe75 MM |
403 | break; |
404 | } | |
405 | ||
406 | return bfun; | |
407 | } | |
408 | ||
8286623c TW |
409 | /* Add a continuation segment for a function into which we return at the end of |
410 | the trace. | |
17b89b34 | 411 | BTINFO is the branch trace information for the current thread. |
23a7fe75 MM |
412 | MFUN and FUN are the symbol information we have for this function. */ |
413 | ||
414 | static struct btrace_function * | |
17b89b34 | 415 | ftrace_new_return (struct btrace_thread_info *btinfo, |
23a7fe75 MM |
416 | struct minimal_symbol *mfun, |
417 | struct symbol *fun) | |
418 | { | |
08c3f6d2 | 419 | struct btrace_function *prev, *bfun, *caller; |
23a7fe75 | 420 | |
8286623c | 421 | bfun = ftrace_new_function (btinfo, mfun, fun); |
08c3f6d2 | 422 | prev = ftrace_find_call_by_number (btinfo, bfun->number - 1); |
23a7fe75 MM |
423 | |
424 | /* It is important to start at PREV's caller. Otherwise, we might find | |
425 | PREV itself, if PREV is a recursive function. */ | |
42bfe59e TW |
426 | caller = ftrace_find_call_by_number (btinfo, prev->up); |
427 | caller = ftrace_find_caller (btinfo, caller, mfun, fun); | |
23a7fe75 MM |
428 | if (caller != NULL) |
429 | { | |
430 | /* The caller of PREV is the preceding btrace function segment in this | |
431 | function instance. */ | |
4aeb0dfc | 432 | gdb_assert (caller->next == 0); |
23a7fe75 | 433 | |
4aeb0dfc TW |
434 | caller->next = bfun->number; |
435 | bfun->prev = caller->number; | |
23a7fe75 MM |
436 | |
437 | /* Maintain the function level. */ | |
438 | bfun->level = caller->level; | |
439 | ||
440 | /* Maintain the call stack. */ | |
441 | bfun->up = caller->up; | |
442 | bfun->flags = caller->flags; | |
443 | ||
444 | ftrace_debug (bfun, "new return"); | |
445 | } | |
446 | else | |
447 | { | |
448 | /* We did not find a caller. This could mean that something went | |
449 | wrong or that the call is simply not included in the trace. */ | |
02d27625 | 450 | |
23a7fe75 | 451 | /* Let's search for some actual call. */ |
42bfe59e TW |
452 | caller = ftrace_find_call_by_number (btinfo, prev->up); |
453 | caller = ftrace_find_call (btinfo, caller); | |
23a7fe75 | 454 | if (caller == NULL) |
02d27625 | 455 | { |
23a7fe75 MM |
456 | /* There is no call in PREV's back trace. We assume that the |
457 | branch trace did not include it. */ | |
458 | ||
259ba1e8 MM |
459 | /* Let's find the topmost function and add a new caller for it. |
460 | This should handle a series of initial tail calls. */ | |
42bfe59e TW |
461 | while (prev->up != 0) |
462 | prev = ftrace_find_call_by_number (btinfo, prev->up); | |
02d27625 | 463 | |
259ba1e8 | 464 | bfun->level = prev->level - 1; |
23a7fe75 MM |
465 | |
466 | /* Fix up the call stack for PREV. */ | |
4aeb0dfc | 467 | ftrace_fixup_caller (btinfo, prev, bfun, BFUN_UP_LINKS_TO_RET); |
23a7fe75 MM |
468 | |
469 | ftrace_debug (bfun, "new return - no caller"); | |
470 | } | |
471 | else | |
02d27625 | 472 | { |
23a7fe75 | 473 | /* There is a call in PREV's back trace to which we should have |
259ba1e8 MM |
474 | returned but didn't. Let's start a new, separate back trace |
475 | from PREV's level. */ | |
476 | bfun->level = prev->level - 1; | |
477 | ||
478 | /* We fix up the back trace for PREV but leave other function segments | |
479 | on the same level as they are. | |
480 | This should handle things like schedule () correctly where we're | |
481 | switching contexts. */ | |
42bfe59e | 482 | prev->up = bfun->number; |
259ba1e8 | 483 | prev->flags = BFUN_UP_LINKS_TO_RET; |
02d27625 | 484 | |
23a7fe75 | 485 | ftrace_debug (bfun, "new return - unknown caller"); |
02d27625 | 486 | } |
23a7fe75 MM |
487 | } |
488 | ||
489 | return bfun; | |
490 | } | |
491 | ||
8286623c | 492 | /* Add a new function segment for a function switch at the end of the trace. |
17b89b34 | 493 | BTINFO is the branch trace information for the current thread. |
23a7fe75 MM |
494 | MFUN and FUN are the symbol information we have for this function. */ |
495 | ||
496 | static struct btrace_function * | |
17b89b34 | 497 | ftrace_new_switch (struct btrace_thread_info *btinfo, |
23a7fe75 MM |
498 | struct minimal_symbol *mfun, |
499 | struct symbol *fun) | |
500 | { | |
08c3f6d2 | 501 | struct btrace_function *prev, *bfun; |
23a7fe75 | 502 | |
4c2c7ac6 MM |
503 | /* This is an unexplained function switch. We can't really be sure about the |
504 | call stack, yet the best I can think of right now is to preserve it. */ | |
8286623c | 505 | bfun = ftrace_new_function (btinfo, mfun, fun); |
08c3f6d2 | 506 | prev = ftrace_find_call_by_number (btinfo, bfun->number - 1); |
4c2c7ac6 MM |
507 | bfun->up = prev->up; |
508 | bfun->flags = prev->flags; | |
02d27625 | 509 | |
23a7fe75 MM |
510 | ftrace_debug (bfun, "new switch"); |
511 | ||
512 | return bfun; | |
513 | } | |
514 | ||
8286623c TW |
515 | /* Add a new function segment for a gap in the trace due to a decode error at |
516 | the end of the trace. | |
17b89b34 | 517 | BTINFO is the branch trace information for the current thread. |
31fd9caa MM |
518 | ERRCODE is the format-specific error code. */ |
519 | ||
520 | static struct btrace_function * | |
8ffd39f2 TW |
521 | ftrace_new_gap (struct btrace_thread_info *btinfo, int errcode, |
522 | std::vector<unsigned int> &gaps) | |
31fd9caa MM |
523 | { |
524 | struct btrace_function *bfun; | |
525 | ||
b54b03bd | 526 | if (btinfo->functions.empty ()) |
8286623c | 527 | bfun = ftrace_new_function (btinfo, NULL, NULL); |
b54b03bd TW |
528 | else |
529 | { | |
530 | /* We hijack the previous function segment if it was empty. */ | |
08c3f6d2 | 531 | bfun = &btinfo->functions.back (); |
0860c437 | 532 | if (bfun->errcode != 0 || !bfun->insn.empty ()) |
b54b03bd TW |
533 | bfun = ftrace_new_function (btinfo, NULL, NULL); |
534 | } | |
31fd9caa MM |
535 | |
536 | bfun->errcode = errcode; | |
8ffd39f2 | 537 | gaps.push_back (bfun->number); |
31fd9caa MM |
538 | |
539 | ftrace_debug (bfun, "new gap"); | |
540 | ||
541 | return bfun; | |
542 | } | |
543 | ||
8286623c TW |
544 | /* Update the current function segment at the end of the trace in BTINFO with |
545 | respect to the instruction at PC. This may create new function segments. | |
23a7fe75 MM |
546 | Return the chronologically latest function segment, never NULL. */ |
547 | ||
548 | static struct btrace_function * | |
8286623c | 549 | ftrace_update_function (struct btrace_thread_info *btinfo, CORE_ADDR pc) |
23a7fe75 MM |
550 | { |
551 | struct bound_minimal_symbol bmfun; | |
552 | struct minimal_symbol *mfun; | |
553 | struct symbol *fun; | |
b54b03bd | 554 | struct btrace_function *bfun; |
23a7fe75 MM |
555 | |
556 | /* Try to determine the function we're in. We use both types of symbols | |
557 | to avoid surprises when we sometimes get a full symbol and sometimes | |
558 | only a minimal symbol. */ | |
559 | fun = find_pc_function (pc); | |
560 | bmfun = lookup_minimal_symbol_by_pc (pc); | |
561 | mfun = bmfun.minsym; | |
562 | ||
563 | if (fun == NULL && mfun == NULL) | |
564 | DEBUG_FTRACE ("no symbol at %s", core_addr_to_string_nz (pc)); | |
565 | ||
b54b03bd TW |
566 | /* If we didn't have a function, we create one. */ |
567 | if (btinfo->functions.empty ()) | |
568 | return ftrace_new_function (btinfo, mfun, fun); | |
569 | ||
570 | /* If we had a gap before, we create a function. */ | |
08c3f6d2 | 571 | bfun = &btinfo->functions.back (); |
b54b03bd | 572 | if (bfun->errcode != 0) |
8286623c | 573 | return ftrace_new_function (btinfo, mfun, fun); |
23a7fe75 MM |
574 | |
575 | /* Check the last instruction, if we have one. | |
576 | We do this check first, since it allows us to fill in the call stack | |
577 | links in addition to the normal flow links. */ | |
0860c437 SM |
578 | btrace_insn *last = NULL; |
579 | if (!bfun->insn.empty ()) | |
580 | last = &bfun->insn.back (); | |
23a7fe75 MM |
581 | |
582 | if (last != NULL) | |
583 | { | |
7d5c24b3 MM |
584 | switch (last->iclass) |
585 | { | |
586 | case BTRACE_INSN_RETURN: | |
986b6601 MM |
587 | { |
588 | const char *fname; | |
589 | ||
590 | /* On some systems, _dl_runtime_resolve returns to the resolved | |
591 | function instead of jumping to it. From our perspective, | |
592 | however, this is a tailcall. | |
593 | If we treated it as return, we wouldn't be able to find the | |
594 | resolved function in our stack back trace. Hence, we would | |
595 | lose the current stack back trace and start anew with an empty | |
596 | back trace. When the resolved function returns, we would then | |
597 | create a stack back trace with the same function names but | |
598 | different frame id's. This will confuse stepping. */ | |
599 | fname = ftrace_print_function_name (bfun); | |
600 | if (strcmp (fname, "_dl_runtime_resolve") == 0) | |
8286623c | 601 | return ftrace_new_tailcall (btinfo, mfun, fun); |
986b6601 | 602 | |
8286623c | 603 | return ftrace_new_return (btinfo, mfun, fun); |
986b6601 | 604 | } |
23a7fe75 | 605 | |
7d5c24b3 MM |
606 | case BTRACE_INSN_CALL: |
607 | /* Ignore calls to the next instruction. They are used for PIC. */ | |
608 | if (last->pc + last->size == pc) | |
609 | break; | |
23a7fe75 | 610 | |
8286623c | 611 | return ftrace_new_call (btinfo, mfun, fun); |
23a7fe75 | 612 | |
7d5c24b3 MM |
613 | case BTRACE_INSN_JUMP: |
614 | { | |
615 | CORE_ADDR start; | |
23a7fe75 | 616 | |
7d5c24b3 | 617 | start = get_pc_function_start (pc); |
23a7fe75 | 618 | |
2dfdb47a MM |
619 | /* A jump to the start of a function is (typically) a tail call. */ |
620 | if (start == pc) | |
8286623c | 621 | return ftrace_new_tailcall (btinfo, mfun, fun); |
2dfdb47a | 622 | |
2cb2ba9a MM |
623 | /* Some versions of _Unwind_RaiseException use an indirect |
624 | jump to 'return' to the exception handler of the caller | |
625 | handling the exception instead of a return. Let's restrict | |
626 | this heuristic to that and related functions. */ | |
627 | const char *fname = ftrace_print_function_name (bfun); | |
628 | if (strncmp (fname, "_Unwind_", strlen ("_Unwind_")) == 0) | |
629 | { | |
630 | struct btrace_function *caller | |
631 | = ftrace_find_call_by_number (btinfo, bfun->up); | |
632 | caller = ftrace_find_caller (btinfo, caller, mfun, fun); | |
633 | if (caller != NULL) | |
634 | return ftrace_new_return (btinfo, mfun, fun); | |
635 | } | |
636 | ||
7d5c24b3 | 637 | /* If we can't determine the function for PC, we treat a jump at |
2dfdb47a MM |
638 | the end of the block as tail call if we're switching functions |
639 | and as an intra-function branch if we don't. */ | |
640 | if (start == 0 && ftrace_function_switched (bfun, mfun, fun)) | |
8286623c | 641 | return ftrace_new_tailcall (btinfo, mfun, fun); |
2dfdb47a MM |
642 | |
643 | break; | |
7d5c24b3 | 644 | } |
02d27625 | 645 | } |
23a7fe75 MM |
646 | } |
647 | ||
648 | /* Check if we're switching functions for some other reason. */ | |
649 | if (ftrace_function_switched (bfun, mfun, fun)) | |
650 | { | |
651 | DEBUG_FTRACE ("switching from %s in %s at %s", | |
652 | ftrace_print_insn_addr (last), | |
653 | ftrace_print_function_name (bfun), | |
654 | ftrace_print_filename (bfun)); | |
02d27625 | 655 | |
8286623c | 656 | return ftrace_new_switch (btinfo, mfun, fun); |
23a7fe75 MM |
657 | } |
658 | ||
659 | return bfun; | |
660 | } | |
661 | ||
23a7fe75 MM |
662 | /* Add the instruction at PC to BFUN's instructions. */ |
663 | ||
664 | static void | |
0860c437 | 665 | ftrace_update_insns (struct btrace_function *bfun, const btrace_insn &insn) |
23a7fe75 | 666 | { |
0860c437 | 667 | bfun->insn.push_back (insn); |
23a7fe75 MM |
668 | |
669 | if (record_debug > 1) | |
670 | ftrace_debug (bfun, "update insn"); | |
671 | } | |
672 | ||
7d5c24b3 MM |
673 | /* Classify the instruction at PC. */ |
674 | ||
675 | static enum btrace_insn_class | |
676 | ftrace_classify_insn (struct gdbarch *gdbarch, CORE_ADDR pc) | |
677 | { | |
7d5c24b3 MM |
678 | enum btrace_insn_class iclass; |
679 | ||
680 | iclass = BTRACE_INSN_OTHER; | |
a70b8144 | 681 | try |
7d5c24b3 MM |
682 | { |
683 | if (gdbarch_insn_is_call (gdbarch, pc)) | |
684 | iclass = BTRACE_INSN_CALL; | |
685 | else if (gdbarch_insn_is_ret (gdbarch, pc)) | |
686 | iclass = BTRACE_INSN_RETURN; | |
687 | else if (gdbarch_insn_is_jump (gdbarch, pc)) | |
688 | iclass = BTRACE_INSN_JUMP; | |
689 | } | |
230d2906 | 690 | catch (const gdb_exception_error &error) |
492d29ea PA |
691 | { |
692 | } | |
7d5c24b3 MM |
693 | |
694 | return iclass; | |
695 | } | |
696 | ||
d87fdac3 MM |
697 | /* Try to match the back trace at LHS to the back trace at RHS. Returns the |
698 | number of matching function segments or zero if the back traces do not | |
42bfe59e | 699 | match. BTINFO is the branch trace information for the current thread. */ |
d87fdac3 MM |
700 | |
701 | static int | |
42bfe59e TW |
702 | ftrace_match_backtrace (struct btrace_thread_info *btinfo, |
703 | struct btrace_function *lhs, | |
d87fdac3 MM |
704 | struct btrace_function *rhs) |
705 | { | |
706 | int matches; | |
707 | ||
708 | for (matches = 0; lhs != NULL && rhs != NULL; ++matches) | |
709 | { | |
710 | if (ftrace_function_switched (lhs, rhs->msym, rhs->sym)) | |
711 | return 0; | |
712 | ||
42bfe59e TW |
713 | lhs = ftrace_get_caller (btinfo, lhs); |
714 | rhs = ftrace_get_caller (btinfo, rhs); | |
d87fdac3 MM |
715 | } |
716 | ||
717 | return matches; | |
718 | } | |
719 | ||
eb8f2b9c TW |
720 | /* Add ADJUSTMENT to the level of BFUN and succeeding function segments. |
721 | BTINFO is the branch trace information for the current thread. */ | |
d87fdac3 MM |
722 | |
723 | static void | |
eb8f2b9c TW |
724 | ftrace_fixup_level (struct btrace_thread_info *btinfo, |
725 | struct btrace_function *bfun, int adjustment) | |
d87fdac3 MM |
726 | { |
727 | if (adjustment == 0) | |
728 | return; | |
729 | ||
730 | DEBUG_FTRACE ("fixup level (%+d)", adjustment); | |
731 | ftrace_debug (bfun, "..bfun"); | |
732 | ||
eb8f2b9c TW |
733 | while (bfun != NULL) |
734 | { | |
735 | bfun->level += adjustment; | |
736 | bfun = ftrace_find_call_by_number (btinfo, bfun->number + 1); | |
737 | } | |
d87fdac3 MM |
738 | } |
739 | ||
740 | /* Recompute the global level offset. Traverse the function trace and compute | |
741 | the global level offset as the negative of the minimal function level. */ | |
742 | ||
743 | static void | |
744 | ftrace_compute_global_level_offset (struct btrace_thread_info *btinfo) | |
745 | { | |
b54b03bd | 746 | int level = INT_MAX; |
d87fdac3 MM |
747 | |
748 | if (btinfo == NULL) | |
749 | return; | |
750 | ||
b54b03bd | 751 | if (btinfo->functions.empty ()) |
d87fdac3 MM |
752 | return; |
753 | ||
b54b03bd TW |
754 | unsigned int length = btinfo->functions.size() - 1; |
755 | for (unsigned int i = 0; i < length; ++i) | |
08c3f6d2 | 756 | level = std::min (level, btinfo->functions[i].level); |
b54b03bd | 757 | |
d87fdac3 MM |
758 | /* The last function segment contains the current instruction, which is not |
759 | really part of the trace. If it contains just this one instruction, we | |
b54b03bd | 760 | ignore the segment. */ |
08c3f6d2 | 761 | struct btrace_function *last = &btinfo->functions.back(); |
0860c437 | 762 | if (last->insn.size () != 1) |
b54b03bd | 763 | level = std::min (level, last->level); |
d87fdac3 MM |
764 | |
765 | DEBUG_FTRACE ("setting global level offset: %d", -level); | |
766 | btinfo->level = -level; | |
767 | } | |
768 | ||
769 | /* Connect the function segments PREV and NEXT in a bottom-to-top walk as in | |
42bfe59e TW |
770 | ftrace_connect_backtrace. BTINFO is the branch trace information for the |
771 | current thread. */ | |
d87fdac3 MM |
772 | |
773 | static void | |
42bfe59e TW |
774 | ftrace_connect_bfun (struct btrace_thread_info *btinfo, |
775 | struct btrace_function *prev, | |
d87fdac3 MM |
776 | struct btrace_function *next) |
777 | { | |
778 | DEBUG_FTRACE ("connecting..."); | |
779 | ftrace_debug (prev, "..prev"); | |
780 | ftrace_debug (next, "..next"); | |
781 | ||
782 | /* The function segments are not yet connected. */ | |
4aeb0dfc TW |
783 | gdb_assert (prev->next == 0); |
784 | gdb_assert (next->prev == 0); | |
d87fdac3 | 785 | |
4aeb0dfc TW |
786 | prev->next = next->number; |
787 | next->prev = prev->number; | |
d87fdac3 MM |
788 | |
789 | /* We may have moved NEXT to a different function level. */ | |
eb8f2b9c | 790 | ftrace_fixup_level (btinfo, next, prev->level - next->level); |
d87fdac3 MM |
791 | |
792 | /* If we run out of back trace for one, let's use the other's. */ | |
42bfe59e | 793 | if (prev->up == 0) |
d87fdac3 | 794 | { |
42bfe59e TW |
795 | const btrace_function_flags flags = next->flags; |
796 | ||
797 | next = ftrace_find_call_by_number (btinfo, next->up); | |
798 | if (next != NULL) | |
d87fdac3 MM |
799 | { |
800 | DEBUG_FTRACE ("using next's callers"); | |
4aeb0dfc | 801 | ftrace_fixup_caller (btinfo, prev, next, flags); |
d87fdac3 MM |
802 | } |
803 | } | |
42bfe59e | 804 | else if (next->up == 0) |
d87fdac3 | 805 | { |
42bfe59e TW |
806 | const btrace_function_flags flags = prev->flags; |
807 | ||
808 | prev = ftrace_find_call_by_number (btinfo, prev->up); | |
809 | if (prev != NULL) | |
d87fdac3 MM |
810 | { |
811 | DEBUG_FTRACE ("using prev's callers"); | |
4aeb0dfc | 812 | ftrace_fixup_caller (btinfo, next, prev, flags); |
d87fdac3 MM |
813 | } |
814 | } | |
815 | else | |
816 | { | |
817 | /* PREV may have a tailcall caller, NEXT can't. If it does, fixup the up | |
818 | link to add the tail callers to NEXT's back trace. | |
819 | ||
820 | This removes NEXT->UP from NEXT's back trace. It will be added back | |
821 | when connecting NEXT and PREV's callers - provided they exist. | |
822 | ||
823 | If PREV's back trace consists of a series of tail calls without an | |
824 | actual call, there will be no further connection and NEXT's caller will | |
825 | be removed for good. To catch this case, we handle it here and connect | |
826 | the top of PREV's back trace to NEXT's caller. */ | |
827 | if ((prev->flags & BFUN_UP_LINKS_TO_TAILCALL) != 0) | |
828 | { | |
829 | struct btrace_function *caller; | |
42bfe59e | 830 | btrace_function_flags next_flags, prev_flags; |
d87fdac3 MM |
831 | |
832 | /* We checked NEXT->UP above so CALLER can't be NULL. */ | |
42bfe59e TW |
833 | caller = ftrace_find_call_by_number (btinfo, next->up); |
834 | next_flags = next->flags; | |
835 | prev_flags = prev->flags; | |
d87fdac3 MM |
836 | |
837 | DEBUG_FTRACE ("adding prev's tail calls to next"); | |
838 | ||
42bfe59e | 839 | prev = ftrace_find_call_by_number (btinfo, prev->up); |
4aeb0dfc | 840 | ftrace_fixup_caller (btinfo, next, prev, prev_flags); |
d87fdac3 | 841 | |
42bfe59e TW |
842 | for (; prev != NULL; prev = ftrace_find_call_by_number (btinfo, |
843 | prev->up)) | |
d87fdac3 MM |
844 | { |
845 | /* At the end of PREV's back trace, continue with CALLER. */ | |
42bfe59e | 846 | if (prev->up == 0) |
d87fdac3 MM |
847 | { |
848 | DEBUG_FTRACE ("fixing up link for tailcall chain"); | |
849 | ftrace_debug (prev, "..top"); | |
850 | ftrace_debug (caller, "..up"); | |
851 | ||
4aeb0dfc | 852 | ftrace_fixup_caller (btinfo, prev, caller, next_flags); |
d87fdac3 MM |
853 | |
854 | /* If we skipped any tail calls, this may move CALLER to a | |
855 | different function level. | |
856 | ||
857 | Note that changing CALLER's level is only OK because we | |
858 | know that this is the last iteration of the bottom-to-top | |
859 | walk in ftrace_connect_backtrace. | |
860 | ||
861 | Otherwise we will fix up CALLER's level when we connect it | |
862 | to PREV's caller in the next iteration. */ | |
eb8f2b9c TW |
863 | ftrace_fixup_level (btinfo, caller, |
864 | prev->level - caller->level - 1); | |
d87fdac3 MM |
865 | break; |
866 | } | |
867 | ||
868 | /* There's nothing to do if we find a real call. */ | |
869 | if ((prev->flags & BFUN_UP_LINKS_TO_TAILCALL) == 0) | |
870 | { | |
871 | DEBUG_FTRACE ("will fix up link in next iteration"); | |
872 | break; | |
873 | } | |
874 | } | |
875 | } | |
876 | } | |
877 | } | |
878 | ||
879 | /* Connect function segments on the same level in the back trace at LHS and RHS. | |
880 | The back traces at LHS and RHS are expected to match according to | |
42bfe59e TW |
881 | ftrace_match_backtrace. BTINFO is the branch trace information for the |
882 | current thread. */ | |
d87fdac3 MM |
883 | |
884 | static void | |
42bfe59e TW |
885 | ftrace_connect_backtrace (struct btrace_thread_info *btinfo, |
886 | struct btrace_function *lhs, | |
d87fdac3 MM |
887 | struct btrace_function *rhs) |
888 | { | |
889 | while (lhs != NULL && rhs != NULL) | |
890 | { | |
891 | struct btrace_function *prev, *next; | |
892 | ||
893 | gdb_assert (!ftrace_function_switched (lhs, rhs->msym, rhs->sym)); | |
894 | ||
895 | /* Connecting LHS and RHS may change the up link. */ | |
896 | prev = lhs; | |
897 | next = rhs; | |
898 | ||
42bfe59e TW |
899 | lhs = ftrace_get_caller (btinfo, lhs); |
900 | rhs = ftrace_get_caller (btinfo, rhs); | |
d87fdac3 | 901 | |
42bfe59e | 902 | ftrace_connect_bfun (btinfo, prev, next); |
d87fdac3 MM |
903 | } |
904 | } | |
905 | ||
906 | /* Bridge the gap between two function segments left and right of a gap if their | |
42bfe59e TW |
907 | respective back traces match in at least MIN_MATCHES functions. BTINFO is |
908 | the branch trace information for the current thread. | |
d87fdac3 MM |
909 | |
910 | Returns non-zero if the gap could be bridged, zero otherwise. */ | |
911 | ||
912 | static int | |
42bfe59e TW |
913 | ftrace_bridge_gap (struct btrace_thread_info *btinfo, |
914 | struct btrace_function *lhs, struct btrace_function *rhs, | |
d87fdac3 MM |
915 | int min_matches) |
916 | { | |
917 | struct btrace_function *best_l, *best_r, *cand_l, *cand_r; | |
918 | int best_matches; | |
919 | ||
920 | DEBUG_FTRACE ("checking gap at insn %u (req matches: %d)", | |
921 | rhs->insn_offset - 1, min_matches); | |
922 | ||
923 | best_matches = 0; | |
924 | best_l = NULL; | |
925 | best_r = NULL; | |
926 | ||
927 | /* We search the back traces of LHS and RHS for valid connections and connect | |
928 | the two functon segments that give the longest combined back trace. */ | |
929 | ||
42bfe59e TW |
930 | for (cand_l = lhs; cand_l != NULL; |
931 | cand_l = ftrace_get_caller (btinfo, cand_l)) | |
932 | for (cand_r = rhs; cand_r != NULL; | |
933 | cand_r = ftrace_get_caller (btinfo, cand_r)) | |
d87fdac3 MM |
934 | { |
935 | int matches; | |
936 | ||
42bfe59e | 937 | matches = ftrace_match_backtrace (btinfo, cand_l, cand_r); |
d87fdac3 MM |
938 | if (best_matches < matches) |
939 | { | |
940 | best_matches = matches; | |
941 | best_l = cand_l; | |
942 | best_r = cand_r; | |
943 | } | |
944 | } | |
945 | ||
946 | /* We need at least MIN_MATCHES matches. */ | |
947 | gdb_assert (min_matches > 0); | |
948 | if (best_matches < min_matches) | |
949 | return 0; | |
950 | ||
951 | DEBUG_FTRACE ("..matches: %d", best_matches); | |
952 | ||
953 | /* We will fix up the level of BEST_R and succeeding function segments such | |
954 | that BEST_R's level matches BEST_L's when we connect BEST_L to BEST_R. | |
955 | ||
956 | This will ignore the level of RHS and following if BEST_R != RHS. I.e. if | |
957 | BEST_R is a successor of RHS in the back trace of RHS (phases 1 and 3). | |
958 | ||
959 | To catch this, we already fix up the level here where we can start at RHS | |
960 | instead of at BEST_R. We will ignore the level fixup when connecting | |
961 | BEST_L to BEST_R as they will already be on the same level. */ | |
eb8f2b9c | 962 | ftrace_fixup_level (btinfo, rhs, best_l->level - best_r->level); |
d87fdac3 | 963 | |
42bfe59e | 964 | ftrace_connect_backtrace (btinfo, best_l, best_r); |
d87fdac3 MM |
965 | |
966 | return best_matches; | |
967 | } | |
968 | ||
969 | /* Try to bridge gaps due to overflow or decode errors by connecting the | |
970 | function segments that are separated by the gap. */ | |
971 | ||
972 | static void | |
8ffd39f2 | 973 | btrace_bridge_gaps (struct thread_info *tp, std::vector<unsigned int> &gaps) |
d87fdac3 | 974 | { |
4aeb0dfc | 975 | struct btrace_thread_info *btinfo = &tp->btrace; |
8ffd39f2 | 976 | std::vector<unsigned int> remaining; |
d87fdac3 MM |
977 | int min_matches; |
978 | ||
979 | DEBUG ("bridge gaps"); | |
980 | ||
d87fdac3 MM |
981 | /* We require a minimum amount of matches for bridging a gap. The number of |
982 | required matches will be lowered with each iteration. | |
983 | ||
984 | The more matches the higher our confidence that the bridging is correct. | |
985 | For big gaps or small traces, however, it may not be feasible to require a | |
986 | high number of matches. */ | |
987 | for (min_matches = 5; min_matches > 0; --min_matches) | |
988 | { | |
989 | /* Let's try to bridge as many gaps as we can. In some cases, we need to | |
990 | skip a gap and revisit it again after we closed later gaps. */ | |
8ffd39f2 | 991 | while (!gaps.empty ()) |
d87fdac3 | 992 | { |
8ffd39f2 | 993 | for (const unsigned int number : gaps) |
d87fdac3 | 994 | { |
8ffd39f2 | 995 | struct btrace_function *gap, *lhs, *rhs; |
d87fdac3 MM |
996 | int bridged; |
997 | ||
8ffd39f2 TW |
998 | gap = ftrace_find_call_by_number (btinfo, number); |
999 | ||
d87fdac3 MM |
1000 | /* We may have a sequence of gaps if we run from one error into |
1001 | the next as we try to re-sync onto the trace stream. Ignore | |
1002 | all but the leftmost gap in such a sequence. | |
1003 | ||
1004 | Also ignore gaps at the beginning of the trace. */ | |
eb8f2b9c | 1005 | lhs = ftrace_find_call_by_number (btinfo, gap->number - 1); |
d87fdac3 MM |
1006 | if (lhs == NULL || lhs->errcode != 0) |
1007 | continue; | |
1008 | ||
1009 | /* Skip gaps to the right. */ | |
eb8f2b9c TW |
1010 | rhs = ftrace_find_call_by_number (btinfo, gap->number + 1); |
1011 | while (rhs != NULL && rhs->errcode != 0) | |
1012 | rhs = ftrace_find_call_by_number (btinfo, rhs->number + 1); | |
d87fdac3 MM |
1013 | |
1014 | /* Ignore gaps at the end of the trace. */ | |
1015 | if (rhs == NULL) | |
1016 | continue; | |
1017 | ||
eb8f2b9c | 1018 | bridged = ftrace_bridge_gap (btinfo, lhs, rhs, min_matches); |
d87fdac3 MM |
1019 | |
1020 | /* Keep track of gaps we were not able to bridge and try again. | |
1021 | If we just pushed them to the end of GAPS we would risk an | |
1022 | infinite loop in case we simply cannot bridge a gap. */ | |
1023 | if (bridged == 0) | |
8ffd39f2 | 1024 | remaining.push_back (number); |
d87fdac3 MM |
1025 | } |
1026 | ||
1027 | /* Let's see if we made any progress. */ | |
8ffd39f2 | 1028 | if (remaining.size () == gaps.size ()) |
d87fdac3 MM |
1029 | break; |
1030 | ||
8ffd39f2 TW |
1031 | gaps.clear (); |
1032 | gaps.swap (remaining); | |
d87fdac3 MM |
1033 | } |
1034 | ||
1035 | /* We get here if either GAPS is empty or if GAPS equals REMAINING. */ | |
8ffd39f2 | 1036 | if (gaps.empty ()) |
d87fdac3 MM |
1037 | break; |
1038 | ||
8ffd39f2 | 1039 | remaining.clear (); |
d87fdac3 MM |
1040 | } |
1041 | ||
d87fdac3 MM |
1042 | /* We may omit this in some cases. Not sure it is worth the extra |
1043 | complication, though. */ | |
eb8f2b9c | 1044 | ftrace_compute_global_level_offset (btinfo); |
d87fdac3 MM |
1045 | } |
1046 | ||
734b0e4b | 1047 | /* Compute the function branch trace from BTS trace. */ |
23a7fe75 MM |
1048 | |
1049 | static void | |
76235df1 | 1050 | btrace_compute_ftrace_bts (struct thread_info *tp, |
d87fdac3 | 1051 | const struct btrace_data_bts *btrace, |
8ffd39f2 | 1052 | std::vector<unsigned int> &gaps) |
23a7fe75 | 1053 | { |
76235df1 | 1054 | struct btrace_thread_info *btinfo; |
23a7fe75 | 1055 | struct gdbarch *gdbarch; |
d87fdac3 | 1056 | unsigned int blk; |
23a7fe75 MM |
1057 | int level; |
1058 | ||
23a7fe75 | 1059 | gdbarch = target_gdbarch (); |
76235df1 | 1060 | btinfo = &tp->btrace; |
734b0e4b | 1061 | blk = VEC_length (btrace_block_s, btrace->blocks); |
23a7fe75 | 1062 | |
b54b03bd TW |
1063 | if (btinfo->functions.empty ()) |
1064 | level = INT_MAX; | |
1065 | else | |
1066 | level = -btinfo->level; | |
1067 | ||
23a7fe75 MM |
1068 | while (blk != 0) |
1069 | { | |
1070 | btrace_block_s *block; | |
1071 | CORE_ADDR pc; | |
1072 | ||
1073 | blk -= 1; | |
1074 | ||
734b0e4b | 1075 | block = VEC_index (btrace_block_s, btrace->blocks, blk); |
23a7fe75 MM |
1076 | pc = block->begin; |
1077 | ||
1078 | for (;;) | |
1079 | { | |
b54b03bd | 1080 | struct btrace_function *bfun; |
7d5c24b3 | 1081 | struct btrace_insn insn; |
23a7fe75 MM |
1082 | int size; |
1083 | ||
1084 | /* We should hit the end of the block. Warn if we went too far. */ | |
1085 | if (block->end < pc) | |
1086 | { | |
b61ce85c | 1087 | /* Indicate the gap in the trace. */ |
8ffd39f2 | 1088 | bfun = ftrace_new_gap (btinfo, BDE_BTS_OVERFLOW, gaps); |
b61ce85c MM |
1089 | |
1090 | warning (_("Recorded trace may be corrupted at instruction " | |
b54b03bd | 1091 | "%u (pc = %s)."), bfun->insn_offset - 1, |
b61ce85c | 1092 | core_addr_to_string_nz (pc)); |
63ab433e | 1093 | |
23a7fe75 MM |
1094 | break; |
1095 | } | |
1096 | ||
b54b03bd | 1097 | bfun = ftrace_update_function (btinfo, pc); |
23a7fe75 | 1098 | |
8710b709 MM |
1099 | /* Maintain the function level offset. |
1100 | For all but the last block, we do it here. */ | |
1101 | if (blk != 0) | |
b54b03bd | 1102 | level = std::min (level, bfun->level); |
23a7fe75 | 1103 | |
7d5c24b3 | 1104 | size = 0; |
a70b8144 | 1105 | try |
492d29ea PA |
1106 | { |
1107 | size = gdb_insn_length (gdbarch, pc); | |
1108 | } | |
230d2906 | 1109 | catch (const gdb_exception_error &error) |
492d29ea PA |
1110 | { |
1111 | } | |
7d5c24b3 MM |
1112 | |
1113 | insn.pc = pc; | |
1114 | insn.size = size; | |
1115 | insn.iclass = ftrace_classify_insn (gdbarch, pc); | |
da8c46d2 | 1116 | insn.flags = 0; |
7d5c24b3 | 1117 | |
0860c437 | 1118 | ftrace_update_insns (bfun, insn); |
23a7fe75 MM |
1119 | |
1120 | /* We're done once we pushed the instruction at the end. */ | |
1121 | if (block->end == pc) | |
1122 | break; | |
1123 | ||
7d5c24b3 | 1124 | /* We can't continue if we fail to compute the size. */ |
23a7fe75 MM |
1125 | if (size <= 0) |
1126 | { | |
31fd9caa MM |
1127 | /* Indicate the gap in the trace. We just added INSN so we're |
1128 | not at the beginning. */ | |
8ffd39f2 | 1129 | bfun = ftrace_new_gap (btinfo, BDE_BTS_INSN_SIZE, gaps); |
31fd9caa | 1130 | |
63ab433e | 1131 | warning (_("Recorded trace may be incomplete at instruction %u " |
b54b03bd | 1132 | "(pc = %s)."), bfun->insn_offset - 1, |
63ab433e MM |
1133 | core_addr_to_string_nz (pc)); |
1134 | ||
23a7fe75 MM |
1135 | break; |
1136 | } | |
1137 | ||
1138 | pc += size; | |
8710b709 MM |
1139 | |
1140 | /* Maintain the function level offset. | |
1141 | For the last block, we do it here to not consider the last | |
1142 | instruction. | |
1143 | Since the last instruction corresponds to the current instruction | |
1144 | and is not really part of the execution history, it shouldn't | |
1145 | affect the level. */ | |
1146 | if (blk == 0) | |
b54b03bd | 1147 | level = std::min (level, bfun->level); |
23a7fe75 | 1148 | } |
02d27625 MM |
1149 | } |
1150 | ||
23a7fe75 MM |
1151 | /* LEVEL is the minimal function level of all btrace function segments. |
1152 | Define the global level offset to -LEVEL so all function levels are | |
1153 | normalized to start at zero. */ | |
1154 | btinfo->level = -level; | |
02d27625 MM |
1155 | } |
1156 | ||
b20a6524 MM |
1157 | #if defined (HAVE_LIBIPT) |
1158 | ||
1159 | static enum btrace_insn_class | |
1160 | pt_reclassify_insn (enum pt_insn_class iclass) | |
1161 | { | |
1162 | switch (iclass) | |
1163 | { | |
1164 | case ptic_call: | |
1165 | return BTRACE_INSN_CALL; | |
1166 | ||
1167 | case ptic_return: | |
1168 | return BTRACE_INSN_RETURN; | |
1169 | ||
1170 | case ptic_jump: | |
1171 | return BTRACE_INSN_JUMP; | |
1172 | ||
1173 | default: | |
1174 | return BTRACE_INSN_OTHER; | |
1175 | } | |
1176 | } | |
1177 | ||
da8c46d2 MM |
1178 | /* Return the btrace instruction flags for INSN. */ |
1179 | ||
d7abe101 | 1180 | static btrace_insn_flags |
b5c36682 | 1181 | pt_btrace_insn_flags (const struct pt_insn &insn) |
da8c46d2 | 1182 | { |
d7abe101 | 1183 | btrace_insn_flags flags = 0; |
da8c46d2 | 1184 | |
b5c36682 | 1185 | if (insn.speculative) |
da8c46d2 MM |
1186 | flags |= BTRACE_INSN_FLAG_SPECULATIVE; |
1187 | ||
1188 | return flags; | |
1189 | } | |
1190 | ||
b5c36682 PA |
1191 | /* Return the btrace instruction for INSN. */ |
1192 | ||
1193 | static btrace_insn | |
1194 | pt_btrace_insn (const struct pt_insn &insn) | |
1195 | { | |
1196 | return {(CORE_ADDR) insn.ip, (gdb_byte) insn.size, | |
1197 | pt_reclassify_insn (insn.iclass), | |
1198 | pt_btrace_insn_flags (insn)}; | |
1199 | } | |
1200 | ||
13ace077 MM |
1201 | /* Handle instruction decode events (libipt-v2). */ |
1202 | ||
1203 | static int | |
1204 | handle_pt_insn_events (struct btrace_thread_info *btinfo, | |
1205 | struct pt_insn_decoder *decoder, | |
1206 | std::vector<unsigned int> &gaps, int status) | |
1207 | { | |
1208 | #if defined (HAVE_PT_INSN_EVENT) | |
1209 | while (status & pts_event_pending) | |
1210 | { | |
1211 | struct btrace_function *bfun; | |
1212 | struct pt_event event; | |
1213 | uint64_t offset; | |
1214 | ||
1215 | status = pt_insn_event (decoder, &event, sizeof (event)); | |
1216 | if (status < 0) | |
1217 | break; | |
1218 | ||
1219 | switch (event.type) | |
1220 | { | |
1221 | default: | |
1222 | break; | |
1223 | ||
1224 | case ptev_enabled: | |
1225 | if (event.variant.enabled.resumed == 0 && !btinfo->functions.empty ()) | |
1226 | { | |
1227 | bfun = ftrace_new_gap (btinfo, BDE_PT_DISABLED, gaps); | |
1228 | ||
1229 | pt_insn_get_offset (decoder, &offset); | |
1230 | ||
1231 | warning (_("Non-contiguous trace at instruction %u (offset = 0x%" | |
1232 | PRIx64 ")."), bfun->insn_offset - 1, offset); | |
1233 | } | |
1234 | ||
1235 | break; | |
1236 | ||
1237 | case ptev_overflow: | |
1238 | bfun = ftrace_new_gap (btinfo, BDE_PT_OVERFLOW, gaps); | |
1239 | ||
1240 | pt_insn_get_offset (decoder, &offset); | |
1241 | ||
1242 | warning (_("Overflow at instruction %u (offset = 0x%" PRIx64 ")."), | |
1243 | bfun->insn_offset - 1, offset); | |
1244 | ||
1245 | break; | |
1246 | } | |
1247 | } | |
1248 | #endif /* defined (HAVE_PT_INSN_EVENT) */ | |
1249 | ||
1250 | return status; | |
1251 | } | |
1252 | ||
1253 | /* Handle events indicated by flags in INSN (libipt-v1). */ | |
1254 | ||
1255 | static void | |
1256 | handle_pt_insn_event_flags (struct btrace_thread_info *btinfo, | |
1257 | struct pt_insn_decoder *decoder, | |
1258 | const struct pt_insn &insn, | |
1259 | std::vector<unsigned int> &gaps) | |
1260 | { | |
1261 | #if defined (HAVE_STRUCT_PT_INSN_ENABLED) | |
1262 | /* Tracing is disabled and re-enabled each time we enter the kernel. Most | |
1263 | times, we continue from the same instruction we stopped before. This is | |
1264 | indicated via the RESUMED instruction flag. The ENABLED instruction flag | |
1265 | means that we continued from some other instruction. Indicate this as a | |
1266 | trace gap except when tracing just started. */ | |
1267 | if (insn.enabled && !btinfo->functions.empty ()) | |
1268 | { | |
1269 | struct btrace_function *bfun; | |
1270 | uint64_t offset; | |
1271 | ||
1272 | bfun = ftrace_new_gap (btinfo, BDE_PT_DISABLED, gaps); | |
1273 | ||
1274 | pt_insn_get_offset (decoder, &offset); | |
1275 | ||
1276 | warning (_("Non-contiguous trace at instruction %u (offset = 0x%" PRIx64 | |
1277 | ", pc = 0x%" PRIx64 ")."), bfun->insn_offset - 1, offset, | |
1278 | insn.ip); | |
1279 | } | |
1280 | #endif /* defined (HAVE_STRUCT_PT_INSN_ENABLED) */ | |
1281 | ||
1282 | #if defined (HAVE_STRUCT_PT_INSN_RESYNCED) | |
1283 | /* Indicate trace overflows. */ | |
1284 | if (insn.resynced) | |
1285 | { | |
1286 | struct btrace_function *bfun; | |
1287 | uint64_t offset; | |
1288 | ||
1289 | bfun = ftrace_new_gap (btinfo, BDE_PT_OVERFLOW, gaps); | |
1290 | ||
1291 | pt_insn_get_offset (decoder, &offset); | |
1292 | ||
1293 | warning (_("Overflow at instruction %u (offset = 0x%" PRIx64 ", pc = 0x%" | |
1294 | PRIx64 ")."), bfun->insn_offset - 1, offset, insn.ip); | |
1295 | } | |
1296 | #endif /* defined (HAVE_STRUCT_PT_INSN_RESYNCED) */ | |
1297 | } | |
b5c36682 | 1298 | |
17b89b34 | 1299 | /* Add function branch trace to BTINFO using DECODER. */ |
b20a6524 MM |
1300 | |
1301 | static void | |
17b89b34 TW |
1302 | ftrace_add_pt (struct btrace_thread_info *btinfo, |
1303 | struct pt_insn_decoder *decoder, | |
b54b03bd | 1304 | int *plevel, |
8ffd39f2 | 1305 | std::vector<unsigned int> &gaps) |
b20a6524 | 1306 | { |
b54b03bd | 1307 | struct btrace_function *bfun; |
b20a6524 | 1308 | uint64_t offset; |
13ace077 | 1309 | int status; |
b20a6524 | 1310 | |
b20a6524 MM |
1311 | for (;;) |
1312 | { | |
b20a6524 MM |
1313 | struct pt_insn insn; |
1314 | ||
13ace077 MM |
1315 | status = pt_insn_sync_forward (decoder); |
1316 | if (status < 0) | |
b20a6524 | 1317 | { |
13ace077 | 1318 | if (status != -pte_eos) |
bc504a31 | 1319 | warning (_("Failed to synchronize onto the Intel Processor " |
13ace077 | 1320 | "Trace stream: %s."), pt_errstr (pt_errcode (status))); |
b20a6524 MM |
1321 | break; |
1322 | } | |
1323 | ||
b20a6524 MM |
1324 | for (;;) |
1325 | { | |
13ace077 MM |
1326 | /* Handle events from the previous iteration or synchronization. */ |
1327 | status = handle_pt_insn_events (btinfo, decoder, gaps, status); | |
1328 | if (status < 0) | |
b20a6524 MM |
1329 | break; |
1330 | ||
13ace077 MM |
1331 | status = pt_insn_next (decoder, &insn, sizeof(insn)); |
1332 | if (status < 0) | |
1333 | break; | |
b61ce85c | 1334 | |
13ace077 MM |
1335 | /* Handle events indicated by flags in INSN. */ |
1336 | handle_pt_insn_event_flags (btinfo, decoder, insn, gaps); | |
b20a6524 | 1337 | |
b54b03bd | 1338 | bfun = ftrace_update_function (btinfo, insn.ip); |
b20a6524 MM |
1339 | |
1340 | /* Maintain the function level offset. */ | |
b54b03bd | 1341 | *plevel = std::min (*plevel, bfun->level); |
b20a6524 | 1342 | |
7525b645 | 1343 | ftrace_update_insns (bfun, pt_btrace_insn (insn)); |
b20a6524 MM |
1344 | } |
1345 | ||
13ace077 | 1346 | if (status == -pte_eos) |
b20a6524 MM |
1347 | break; |
1348 | ||
b20a6524 | 1349 | /* Indicate the gap in the trace. */ |
13ace077 | 1350 | bfun = ftrace_new_gap (btinfo, status, gaps); |
b20a6524 | 1351 | |
63ab433e MM |
1352 | pt_insn_get_offset (decoder, &offset); |
1353 | ||
1354 | warning (_("Decode error (%d) at instruction %u (offset = 0x%" PRIx64 | |
13ace077 MM |
1355 | ", pc = 0x%" PRIx64 "): %s."), status, bfun->insn_offset - 1, |
1356 | offset, insn.ip, pt_errstr (pt_errcode (status))); | |
63ab433e | 1357 | } |
b20a6524 MM |
1358 | } |
1359 | ||
1360 | /* A callback function to allow the trace decoder to read the inferior's | |
1361 | memory. */ | |
1362 | ||
1363 | static int | |
1364 | btrace_pt_readmem_callback (gdb_byte *buffer, size_t size, | |
80a2b330 | 1365 | const struct pt_asid *asid, uint64_t pc, |
b20a6524 MM |
1366 | void *context) |
1367 | { | |
43368e1d | 1368 | int result, errcode; |
b20a6524 | 1369 | |
43368e1d | 1370 | result = (int) size; |
a70b8144 | 1371 | try |
b20a6524 | 1372 | { |
80a2b330 | 1373 | errcode = target_read_code ((CORE_ADDR) pc, buffer, size); |
b20a6524 | 1374 | if (errcode != 0) |
43368e1d | 1375 | result = -pte_nomap; |
b20a6524 | 1376 | } |
230d2906 | 1377 | catch (const gdb_exception_error &error) |
b20a6524 | 1378 | { |
43368e1d | 1379 | result = -pte_nomap; |
b20a6524 | 1380 | } |
b20a6524 | 1381 | |
43368e1d | 1382 | return result; |
b20a6524 MM |
1383 | } |
1384 | ||
1385 | /* Translate the vendor from one enum to another. */ | |
1386 | ||
1387 | static enum pt_cpu_vendor | |
1388 | pt_translate_cpu_vendor (enum btrace_cpu_vendor vendor) | |
1389 | { | |
1390 | switch (vendor) | |
1391 | { | |
1392 | default: | |
1393 | return pcv_unknown; | |
1394 | ||
1395 | case CV_INTEL: | |
1396 | return pcv_intel; | |
1397 | } | |
1398 | } | |
1399 | ||
1400 | /* Finalize the function branch trace after decode. */ | |
1401 | ||
1402 | static void btrace_finalize_ftrace_pt (struct pt_insn_decoder *decoder, | |
1403 | struct thread_info *tp, int level) | |
1404 | { | |
1405 | pt_insn_free_decoder (decoder); | |
1406 | ||
1407 | /* LEVEL is the minimal function level of all btrace function segments. | |
1408 | Define the global level offset to -LEVEL so all function levels are | |
1409 | normalized to start at zero. */ | |
1410 | tp->btrace.level = -level; | |
1411 | ||
1412 | /* Add a single last instruction entry for the current PC. | |
1413 | This allows us to compute the backtrace at the current PC using both | |
1414 | standard unwind and btrace unwind. | |
1415 | This extra entry is ignored by all record commands. */ | |
1416 | btrace_add_pc (tp); | |
1417 | } | |
1418 | ||
bc504a31 PA |
1419 | /* Compute the function branch trace from Intel Processor Trace |
1420 | format. */ | |
b20a6524 MM |
1421 | |
1422 | static void | |
1423 | btrace_compute_ftrace_pt (struct thread_info *tp, | |
d87fdac3 | 1424 | const struct btrace_data_pt *btrace, |
8ffd39f2 | 1425 | std::vector<unsigned int> &gaps) |
b20a6524 MM |
1426 | { |
1427 | struct btrace_thread_info *btinfo; | |
1428 | struct pt_insn_decoder *decoder; | |
1429 | struct pt_config config; | |
1430 | int level, errcode; | |
1431 | ||
1432 | if (btrace->size == 0) | |
1433 | return; | |
1434 | ||
1435 | btinfo = &tp->btrace; | |
b54b03bd TW |
1436 | if (btinfo->functions.empty ()) |
1437 | level = INT_MAX; | |
1438 | else | |
1439 | level = -btinfo->level; | |
b20a6524 MM |
1440 | |
1441 | pt_config_init(&config); | |
1442 | config.begin = btrace->data; | |
1443 | config.end = btrace->data + btrace->size; | |
1444 | ||
4a4495d6 MM |
1445 | /* We treat an unknown vendor as 'no errata'. */ |
1446 | if (btrace->config.cpu.vendor != CV_UNKNOWN) | |
1447 | { | |
1448 | config.cpu.vendor | |
1449 | = pt_translate_cpu_vendor (btrace->config.cpu.vendor); | |
1450 | config.cpu.family = btrace->config.cpu.family; | |
1451 | config.cpu.model = btrace->config.cpu.model; | |
1452 | config.cpu.stepping = btrace->config.cpu.stepping; | |
b20a6524 | 1453 | |
4a4495d6 MM |
1454 | errcode = pt_cpu_errata (&config.errata, &config.cpu); |
1455 | if (errcode < 0) | |
1456 | error (_("Failed to configure the Intel Processor Trace " | |
1457 | "decoder: %s."), pt_errstr (pt_errcode (errcode))); | |
1458 | } | |
b20a6524 MM |
1459 | |
1460 | decoder = pt_insn_alloc_decoder (&config); | |
1461 | if (decoder == NULL) | |
bc504a31 | 1462 | error (_("Failed to allocate the Intel Processor Trace decoder.")); |
b20a6524 | 1463 | |
a70b8144 | 1464 | try |
b20a6524 MM |
1465 | { |
1466 | struct pt_image *image; | |
1467 | ||
1468 | image = pt_insn_get_image(decoder); | |
1469 | if (image == NULL) | |
bc504a31 | 1470 | error (_("Failed to configure the Intel Processor Trace decoder.")); |
b20a6524 MM |
1471 | |
1472 | errcode = pt_image_set_callback(image, btrace_pt_readmem_callback, NULL); | |
1473 | if (errcode < 0) | |
bc504a31 | 1474 | error (_("Failed to configure the Intel Processor Trace decoder: " |
b20a6524 MM |
1475 | "%s."), pt_errstr (pt_errcode (errcode))); |
1476 | ||
b54b03bd | 1477 | ftrace_add_pt (btinfo, decoder, &level, gaps); |
b20a6524 | 1478 | } |
230d2906 | 1479 | catch (const gdb_exception &error) |
b20a6524 MM |
1480 | { |
1481 | /* Indicate a gap in the trace if we quit trace processing. */ | |
b54b03bd | 1482 | if (error.reason == RETURN_QUIT && !btinfo->functions.empty ()) |
8ffd39f2 | 1483 | ftrace_new_gap (btinfo, BDE_PT_USER_QUIT, gaps); |
b20a6524 MM |
1484 | |
1485 | btrace_finalize_ftrace_pt (decoder, tp, level); | |
1486 | ||
eedc3f4f | 1487 | throw; |
b20a6524 | 1488 | } |
b20a6524 MM |
1489 | |
1490 | btrace_finalize_ftrace_pt (decoder, tp, level); | |
1491 | } | |
1492 | ||
1493 | #else /* defined (HAVE_LIBIPT) */ | |
1494 | ||
1495 | static void | |
1496 | btrace_compute_ftrace_pt (struct thread_info *tp, | |
d87fdac3 | 1497 | const struct btrace_data_pt *btrace, |
8ffd39f2 | 1498 | std::vector<unsigned int> &gaps) |
b20a6524 MM |
1499 | { |
1500 | internal_error (__FILE__, __LINE__, _("Unexpected branch trace format.")); | |
1501 | } | |
1502 | ||
1503 | #endif /* defined (HAVE_LIBIPT) */ | |
1504 | ||
734b0e4b | 1505 | /* Compute the function branch trace from a block branch trace BTRACE for |
4a4495d6 MM |
1506 | a thread given by BTINFO. If CPU is not NULL, overwrite the cpu in the |
1507 | branch trace configuration. This is currently only used for the PT | |
1508 | format. */ | |
734b0e4b MM |
1509 | |
1510 | static void | |
4a4495d6 MM |
1511 | btrace_compute_ftrace_1 (struct thread_info *tp, |
1512 | struct btrace_data *btrace, | |
1513 | const struct btrace_cpu *cpu, | |
8ffd39f2 | 1514 | std::vector<unsigned int> &gaps) |
734b0e4b MM |
1515 | { |
1516 | DEBUG ("compute ftrace"); | |
1517 | ||
1518 | switch (btrace->format) | |
1519 | { | |
1520 | case BTRACE_FORMAT_NONE: | |
1521 | return; | |
1522 | ||
1523 | case BTRACE_FORMAT_BTS: | |
d87fdac3 | 1524 | btrace_compute_ftrace_bts (tp, &btrace->variant.bts, gaps); |
734b0e4b | 1525 | return; |
b20a6524 MM |
1526 | |
1527 | case BTRACE_FORMAT_PT: | |
4a4495d6 MM |
1528 | /* Overwrite the cpu we use for enabling errata workarounds. */ |
1529 | if (cpu != nullptr) | |
1530 | btrace->variant.pt.config.cpu = *cpu; | |
1531 | ||
d87fdac3 | 1532 | btrace_compute_ftrace_pt (tp, &btrace->variant.pt, gaps); |
b20a6524 | 1533 | return; |
734b0e4b MM |
1534 | } |
1535 | ||
1536 | internal_error (__FILE__, __LINE__, _("Unkown branch trace format.")); | |
1537 | } | |
1538 | ||
d87fdac3 | 1539 | static void |
8ffd39f2 | 1540 | btrace_finalize_ftrace (struct thread_info *tp, std::vector<unsigned int> &gaps) |
d87fdac3 | 1541 | { |
8ffd39f2 | 1542 | if (!gaps.empty ()) |
d87fdac3 | 1543 | { |
8ffd39f2 | 1544 | tp->btrace.ngaps += gaps.size (); |
d87fdac3 MM |
1545 | btrace_bridge_gaps (tp, gaps); |
1546 | } | |
1547 | } | |
1548 | ||
1549 | static void | |
4a4495d6 MM |
1550 | btrace_compute_ftrace (struct thread_info *tp, struct btrace_data *btrace, |
1551 | const struct btrace_cpu *cpu) | |
d87fdac3 | 1552 | { |
8ffd39f2 | 1553 | std::vector<unsigned int> gaps; |
d87fdac3 | 1554 | |
a70b8144 | 1555 | try |
d87fdac3 | 1556 | { |
4a4495d6 | 1557 | btrace_compute_ftrace_1 (tp, btrace, cpu, gaps); |
d87fdac3 | 1558 | } |
230d2906 | 1559 | catch (const gdb_exception &error) |
d87fdac3 | 1560 | { |
8ffd39f2 | 1561 | btrace_finalize_ftrace (tp, gaps); |
d87fdac3 | 1562 | |
eedc3f4f | 1563 | throw; |
d87fdac3 | 1564 | } |
d87fdac3 | 1565 | |
8ffd39f2 | 1566 | btrace_finalize_ftrace (tp, gaps); |
d87fdac3 MM |
1567 | } |
1568 | ||
6e07b1d2 MM |
1569 | /* Add an entry for the current PC. */ |
1570 | ||
1571 | static void | |
1572 | btrace_add_pc (struct thread_info *tp) | |
1573 | { | |
734b0e4b | 1574 | struct btrace_data btrace; |
6e07b1d2 MM |
1575 | struct btrace_block *block; |
1576 | struct regcache *regcache; | |
6e07b1d2 MM |
1577 | CORE_ADDR pc; |
1578 | ||
00431a78 | 1579 | regcache = get_thread_regcache (tp); |
6e07b1d2 MM |
1580 | pc = regcache_read_pc (regcache); |
1581 | ||
734b0e4b MM |
1582 | btrace.format = BTRACE_FORMAT_BTS; |
1583 | btrace.variant.bts.blocks = NULL; | |
6e07b1d2 | 1584 | |
734b0e4b | 1585 | block = VEC_safe_push (btrace_block_s, btrace.variant.bts.blocks, NULL); |
6e07b1d2 MM |
1586 | block->begin = pc; |
1587 | block->end = pc; | |
1588 | ||
4a4495d6 | 1589 | btrace_compute_ftrace (tp, &btrace, NULL); |
6e07b1d2 MM |
1590 | } |
1591 | ||
02d27625 MM |
1592 | /* See btrace.h. */ |
1593 | ||
1594 | void | |
f4abbc16 | 1595 | btrace_enable (struct thread_info *tp, const struct btrace_config *conf) |
02d27625 MM |
1596 | { |
1597 | if (tp->btrace.target != NULL) | |
1598 | return; | |
1599 | ||
46a3515b MM |
1600 | #if !defined (HAVE_LIBIPT) |
1601 | if (conf->format == BTRACE_FORMAT_PT) | |
c4e12631 | 1602 | error (_("Intel Processor Trace support was disabled at compile time.")); |
46a3515b MM |
1603 | #endif /* !defined (HAVE_LIBIPT) */ |
1604 | ||
43792cf0 | 1605 | DEBUG ("enable thread %s (%s)", print_thread_id (tp), |
a068643d | 1606 | target_pid_to_str (tp->ptid).c_str ()); |
02d27625 | 1607 | |
f4abbc16 | 1608 | tp->btrace.target = target_enable_btrace (tp->ptid, conf); |
6e07b1d2 | 1609 | |
cd4007e4 MM |
1610 | /* We're done if we failed to enable tracing. */ |
1611 | if (tp->btrace.target == NULL) | |
1612 | return; | |
1613 | ||
1614 | /* We need to undo the enable in case of errors. */ | |
a70b8144 | 1615 | try |
cd4007e4 MM |
1616 | { |
1617 | /* Add an entry for the current PC so we start tracing from where we | |
1618 | enabled it. | |
1619 | ||
1620 | If we can't access TP's registers, TP is most likely running. In this | |
1621 | case, we can't really say where tracing was enabled so it should be | |
1622 | safe to simply skip this step. | |
1623 | ||
1624 | This is not relevant for BTRACE_FORMAT_PT since the trace will already | |
1625 | start at the PC at which tracing was enabled. */ | |
1626 | if (conf->format != BTRACE_FORMAT_PT | |
00431a78 | 1627 | && can_access_registers_thread (tp)) |
cd4007e4 MM |
1628 | btrace_add_pc (tp); |
1629 | } | |
230d2906 | 1630 | catch (const gdb_exception &exception) |
cd4007e4 MM |
1631 | { |
1632 | btrace_disable (tp); | |
1633 | ||
eedc3f4f | 1634 | throw; |
cd4007e4 | 1635 | } |
02d27625 MM |
1636 | } |
1637 | ||
1638 | /* See btrace.h. */ | |
1639 | ||
f4abbc16 MM |
1640 | const struct btrace_config * |
1641 | btrace_conf (const struct btrace_thread_info *btinfo) | |
1642 | { | |
1643 | if (btinfo->target == NULL) | |
1644 | return NULL; | |
1645 | ||
1646 | return target_btrace_conf (btinfo->target); | |
1647 | } | |
1648 | ||
1649 | /* See btrace.h. */ | |
1650 | ||
02d27625 MM |
1651 | void |
1652 | btrace_disable (struct thread_info *tp) | |
1653 | { | |
1654 | struct btrace_thread_info *btp = &tp->btrace; | |
02d27625 MM |
1655 | |
1656 | if (btp->target == NULL) | |
1657 | return; | |
1658 | ||
43792cf0 | 1659 | DEBUG ("disable thread %s (%s)", print_thread_id (tp), |
a068643d | 1660 | target_pid_to_str (tp->ptid).c_str ()); |
02d27625 MM |
1661 | |
1662 | target_disable_btrace (btp->target); | |
1663 | btp->target = NULL; | |
1664 | ||
1665 | btrace_clear (tp); | |
1666 | } | |
1667 | ||
1668 | /* See btrace.h. */ | |
1669 | ||
1670 | void | |
1671 | btrace_teardown (struct thread_info *tp) | |
1672 | { | |
1673 | struct btrace_thread_info *btp = &tp->btrace; | |
02d27625 MM |
1674 | |
1675 | if (btp->target == NULL) | |
1676 | return; | |
1677 | ||
43792cf0 | 1678 | DEBUG ("teardown thread %s (%s)", print_thread_id (tp), |
a068643d | 1679 | target_pid_to_str (tp->ptid).c_str ()); |
02d27625 MM |
1680 | |
1681 | target_teardown_btrace (btp->target); | |
1682 | btp->target = NULL; | |
1683 | ||
1684 | btrace_clear (tp); | |
1685 | } | |
1686 | ||
734b0e4b | 1687 | /* Stitch branch trace in BTS format. */ |
969c39fb MM |
1688 | |
1689 | static int | |
31fd9caa | 1690 | btrace_stitch_bts (struct btrace_data_bts *btrace, struct thread_info *tp) |
969c39fb | 1691 | { |
31fd9caa | 1692 | struct btrace_thread_info *btinfo; |
969c39fb | 1693 | struct btrace_function *last_bfun; |
969c39fb MM |
1694 | btrace_block_s *first_new_block; |
1695 | ||
31fd9caa | 1696 | btinfo = &tp->btrace; |
b54b03bd | 1697 | gdb_assert (!btinfo->functions.empty ()); |
31fd9caa MM |
1698 | gdb_assert (!VEC_empty (btrace_block_s, btrace->blocks)); |
1699 | ||
08c3f6d2 | 1700 | last_bfun = &btinfo->functions.back (); |
b54b03bd | 1701 | |
31fd9caa MM |
1702 | /* If the existing trace ends with a gap, we just glue the traces |
1703 | together. We need to drop the last (i.e. chronologically first) block | |
1704 | of the new trace, though, since we can't fill in the start address.*/ | |
0860c437 | 1705 | if (last_bfun->insn.empty ()) |
31fd9caa MM |
1706 | { |
1707 | VEC_pop (btrace_block_s, btrace->blocks); | |
1708 | return 0; | |
1709 | } | |
969c39fb MM |
1710 | |
1711 | /* Beware that block trace starts with the most recent block, so the | |
1712 | chronologically first block in the new trace is the last block in | |
1713 | the new trace's block vector. */ | |
734b0e4b | 1714 | first_new_block = VEC_last (btrace_block_s, btrace->blocks); |
0860c437 | 1715 | const btrace_insn &last_insn = last_bfun->insn.back (); |
969c39fb MM |
1716 | |
1717 | /* If the current PC at the end of the block is the same as in our current | |
1718 | trace, there are two explanations: | |
1719 | 1. we executed the instruction and some branch brought us back. | |
1720 | 2. we have not made any progress. | |
1721 | In the first case, the delta trace vector should contain at least two | |
1722 | entries. | |
1723 | In the second case, the delta trace vector should contain exactly one | |
1724 | entry for the partial block containing the current PC. Remove it. */ | |
0860c437 | 1725 | if (first_new_block->end == last_insn.pc |
734b0e4b | 1726 | && VEC_length (btrace_block_s, btrace->blocks) == 1) |
969c39fb | 1727 | { |
734b0e4b | 1728 | VEC_pop (btrace_block_s, btrace->blocks); |
969c39fb MM |
1729 | return 0; |
1730 | } | |
1731 | ||
0860c437 | 1732 | DEBUG ("stitching %s to %s", ftrace_print_insn_addr (&last_insn), |
969c39fb MM |
1733 | core_addr_to_string_nz (first_new_block->end)); |
1734 | ||
1735 | /* Do a simple sanity check to make sure we don't accidentally end up | |
1736 | with a bad block. This should not occur in practice. */ | |
0860c437 | 1737 | if (first_new_block->end < last_insn.pc) |
969c39fb MM |
1738 | { |
1739 | warning (_("Error while trying to read delta trace. Falling back to " | |
1740 | "a full read.")); | |
1741 | return -1; | |
1742 | } | |
1743 | ||
1744 | /* We adjust the last block to start at the end of our current trace. */ | |
1745 | gdb_assert (first_new_block->begin == 0); | |
0860c437 | 1746 | first_new_block->begin = last_insn.pc; |
969c39fb MM |
1747 | |
1748 | /* We simply pop the last insn so we can insert it again as part of | |
1749 | the normal branch trace computation. | |
1750 | Since instruction iterators are based on indices in the instructions | |
1751 | vector, we don't leave any pointers dangling. */ | |
1752 | DEBUG ("pruning insn at %s for stitching", | |
0860c437 | 1753 | ftrace_print_insn_addr (&last_insn)); |
969c39fb | 1754 | |
0860c437 | 1755 | last_bfun->insn.pop_back (); |
969c39fb MM |
1756 | |
1757 | /* The instructions vector may become empty temporarily if this has | |
1758 | been the only instruction in this function segment. | |
1759 | This violates the invariant but will be remedied shortly by | |
1760 | btrace_compute_ftrace when we add the new trace. */ | |
31fd9caa MM |
1761 | |
1762 | /* The only case where this would hurt is if the entire trace consisted | |
1763 | of just that one instruction. If we remove it, we might turn the now | |
1764 | empty btrace function segment into a gap. But we don't want gaps at | |
1765 | the beginning. To avoid this, we remove the entire old trace. */ | |
0860c437 | 1766 | if (last_bfun->number == 1 && last_bfun->insn.empty ()) |
31fd9caa MM |
1767 | btrace_clear (tp); |
1768 | ||
969c39fb MM |
1769 | return 0; |
1770 | } | |
1771 | ||
734b0e4b MM |
1772 | /* Adjust the block trace in order to stitch old and new trace together. |
1773 | BTRACE is the new delta trace between the last and the current stop. | |
31fd9caa MM |
1774 | TP is the traced thread. |
1775 | May modifx BTRACE as well as the existing trace in TP. | |
734b0e4b MM |
1776 | Return 0 on success, -1 otherwise. */ |
1777 | ||
1778 | static int | |
31fd9caa | 1779 | btrace_stitch_trace (struct btrace_data *btrace, struct thread_info *tp) |
734b0e4b MM |
1780 | { |
1781 | /* If we don't have trace, there's nothing to do. */ | |
8dcc53b3 | 1782 | if (btrace->empty ()) |
734b0e4b MM |
1783 | return 0; |
1784 | ||
1785 | switch (btrace->format) | |
1786 | { | |
1787 | case BTRACE_FORMAT_NONE: | |
1788 | return 0; | |
1789 | ||
1790 | case BTRACE_FORMAT_BTS: | |
31fd9caa | 1791 | return btrace_stitch_bts (&btrace->variant.bts, tp); |
b20a6524 MM |
1792 | |
1793 | case BTRACE_FORMAT_PT: | |
1794 | /* Delta reads are not supported. */ | |
1795 | return -1; | |
734b0e4b MM |
1796 | } |
1797 | ||
1798 | internal_error (__FILE__, __LINE__, _("Unkown branch trace format.")); | |
1799 | } | |
1800 | ||
969c39fb MM |
1801 | /* Clear the branch trace histories in BTINFO. */ |
1802 | ||
1803 | static void | |
1804 | btrace_clear_history (struct btrace_thread_info *btinfo) | |
1805 | { | |
1806 | xfree (btinfo->insn_history); | |
1807 | xfree (btinfo->call_history); | |
1808 | xfree (btinfo->replay); | |
1809 | ||
1810 | btinfo->insn_history = NULL; | |
1811 | btinfo->call_history = NULL; | |
1812 | btinfo->replay = NULL; | |
1813 | } | |
1814 | ||
b0627500 MM |
1815 | /* Clear the branch trace maintenance histories in BTINFO. */ |
1816 | ||
1817 | static void | |
1818 | btrace_maint_clear (struct btrace_thread_info *btinfo) | |
1819 | { | |
1820 | switch (btinfo->data.format) | |
1821 | { | |
1822 | default: | |
1823 | break; | |
1824 | ||
1825 | case BTRACE_FORMAT_BTS: | |
1826 | btinfo->maint.variant.bts.packet_history.begin = 0; | |
1827 | btinfo->maint.variant.bts.packet_history.end = 0; | |
1828 | break; | |
1829 | ||
1830 | #if defined (HAVE_LIBIPT) | |
1831 | case BTRACE_FORMAT_PT: | |
1832 | xfree (btinfo->maint.variant.pt.packets); | |
1833 | ||
1834 | btinfo->maint.variant.pt.packets = NULL; | |
1835 | btinfo->maint.variant.pt.packet_history.begin = 0; | |
1836 | btinfo->maint.variant.pt.packet_history.end = 0; | |
1837 | break; | |
1838 | #endif /* defined (HAVE_LIBIPT) */ | |
1839 | } | |
1840 | } | |
1841 | ||
02d27625 MM |
1842 | /* See btrace.h. */ |
1843 | ||
508352a9 TW |
1844 | const char * |
1845 | btrace_decode_error (enum btrace_format format, int errcode) | |
1846 | { | |
1847 | switch (format) | |
1848 | { | |
1849 | case BTRACE_FORMAT_BTS: | |
1850 | switch (errcode) | |
1851 | { | |
1852 | case BDE_BTS_OVERFLOW: | |
1853 | return _("instruction overflow"); | |
1854 | ||
1855 | case BDE_BTS_INSN_SIZE: | |
1856 | return _("unknown instruction"); | |
1857 | ||
1858 | default: | |
1859 | break; | |
1860 | } | |
1861 | break; | |
1862 | ||
1863 | #if defined (HAVE_LIBIPT) | |
1864 | case BTRACE_FORMAT_PT: | |
1865 | switch (errcode) | |
1866 | { | |
1867 | case BDE_PT_USER_QUIT: | |
1868 | return _("trace decode cancelled"); | |
1869 | ||
1870 | case BDE_PT_DISABLED: | |
1871 | return _("disabled"); | |
1872 | ||
1873 | case BDE_PT_OVERFLOW: | |
1874 | return _("overflow"); | |
1875 | ||
1876 | default: | |
1877 | if (errcode < 0) | |
1878 | return pt_errstr (pt_errcode (errcode)); | |
1879 | break; | |
1880 | } | |
1881 | break; | |
1882 | #endif /* defined (HAVE_LIBIPT) */ | |
1883 | ||
1884 | default: | |
1885 | break; | |
1886 | } | |
1887 | ||
1888 | return _("unknown"); | |
1889 | } | |
1890 | ||
1891 | /* See btrace.h. */ | |
1892 | ||
02d27625 | 1893 | void |
4a4495d6 | 1894 | btrace_fetch (struct thread_info *tp, const struct btrace_cpu *cpu) |
02d27625 MM |
1895 | { |
1896 | struct btrace_thread_info *btinfo; | |
969c39fb | 1897 | struct btrace_target_info *tinfo; |
734b0e4b | 1898 | struct btrace_data btrace; |
969c39fb | 1899 | int errcode; |
02d27625 | 1900 | |
43792cf0 | 1901 | DEBUG ("fetch thread %s (%s)", print_thread_id (tp), |
a068643d | 1902 | target_pid_to_str (tp->ptid).c_str ()); |
02d27625 MM |
1903 | |
1904 | btinfo = &tp->btrace; | |
969c39fb MM |
1905 | tinfo = btinfo->target; |
1906 | if (tinfo == NULL) | |
1907 | return; | |
1908 | ||
1909 | /* There's no way we could get new trace while replaying. | |
1910 | On the other hand, delta trace would return a partial record with the | |
1911 | current PC, which is the replay PC, not the last PC, as expected. */ | |
1912 | if (btinfo->replay != NULL) | |
02d27625 MM |
1913 | return; |
1914 | ||
ae20e79a TW |
1915 | /* With CLI usage, TP->PTID always equals INFERIOR_PTID here. Now that we |
1916 | can store a gdb.Record object in Python referring to a different thread | |
1917 | than the current one, temporarily set INFERIOR_PTID. */ | |
2989a365 | 1918 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); |
ae20e79a TW |
1919 | inferior_ptid = tp->ptid; |
1920 | ||
cd4007e4 | 1921 | /* We should not be called on running or exited threads. */ |
00431a78 | 1922 | gdb_assert (can_access_registers_thread (tp)); |
cd4007e4 | 1923 | |
969c39fb | 1924 | /* Let's first try to extend the trace we already have. */ |
b54b03bd | 1925 | if (!btinfo->functions.empty ()) |
969c39fb MM |
1926 | { |
1927 | errcode = target_read_btrace (&btrace, tinfo, BTRACE_READ_DELTA); | |
1928 | if (errcode == 0) | |
1929 | { | |
1930 | /* Success. Let's try to stitch the traces together. */ | |
31fd9caa | 1931 | errcode = btrace_stitch_trace (&btrace, tp); |
969c39fb MM |
1932 | } |
1933 | else | |
1934 | { | |
1935 | /* We failed to read delta trace. Let's try to read new trace. */ | |
1936 | errcode = target_read_btrace (&btrace, tinfo, BTRACE_READ_NEW); | |
1937 | ||
1938 | /* If we got any new trace, discard what we have. */ | |
8dcc53b3 | 1939 | if (errcode == 0 && !btrace.empty ()) |
969c39fb MM |
1940 | btrace_clear (tp); |
1941 | } | |
1942 | ||
1943 | /* If we were not able to read the trace, we start over. */ | |
1944 | if (errcode != 0) | |
1945 | { | |
1946 | btrace_clear (tp); | |
1947 | errcode = target_read_btrace (&btrace, tinfo, BTRACE_READ_ALL); | |
1948 | } | |
1949 | } | |
1950 | else | |
1951 | errcode = target_read_btrace (&btrace, tinfo, BTRACE_READ_ALL); | |
1952 | ||
1953 | /* If we were not able to read the branch trace, signal an error. */ | |
1954 | if (errcode != 0) | |
1955 | error (_("Failed to read branch trace.")); | |
1956 | ||
1957 | /* Compute the trace, provided we have any. */ | |
8dcc53b3 | 1958 | if (!btrace.empty ()) |
23a7fe75 | 1959 | { |
9be54cae MM |
1960 | /* Store the raw trace data. The stored data will be cleared in |
1961 | btrace_clear, so we always append the new trace. */ | |
1962 | btrace_data_append (&btinfo->data, &btrace); | |
b0627500 | 1963 | btrace_maint_clear (btinfo); |
9be54cae | 1964 | |
969c39fb | 1965 | btrace_clear_history (btinfo); |
4a4495d6 | 1966 | btrace_compute_ftrace (tp, &btrace, cpu); |
23a7fe75 | 1967 | } |
02d27625 MM |
1968 | } |
1969 | ||
1970 | /* See btrace.h. */ | |
1971 | ||
1972 | void | |
1973 | btrace_clear (struct thread_info *tp) | |
1974 | { | |
1975 | struct btrace_thread_info *btinfo; | |
1976 | ||
43792cf0 | 1977 | DEBUG ("clear thread %s (%s)", print_thread_id (tp), |
a068643d | 1978 | target_pid_to_str (tp->ptid).c_str ()); |
02d27625 | 1979 | |
0b722aec MM |
1980 | /* Make sure btrace frames that may hold a pointer into the branch |
1981 | trace data are destroyed. */ | |
1982 | reinit_frame_cache (); | |
1983 | ||
02d27625 | 1984 | btinfo = &tp->btrace; |
23a7fe75 | 1985 | |
17b89b34 | 1986 | btinfo->functions.clear (); |
31fd9caa | 1987 | btinfo->ngaps = 0; |
23a7fe75 | 1988 | |
b0627500 MM |
1989 | /* Must clear the maint data before - it depends on BTINFO->DATA. */ |
1990 | btrace_maint_clear (btinfo); | |
8dcc53b3 | 1991 | btinfo->data.clear (); |
969c39fb | 1992 | btrace_clear_history (btinfo); |
02d27625 MM |
1993 | } |
1994 | ||
1995 | /* See btrace.h. */ | |
1996 | ||
1997 | void | |
1998 | btrace_free_objfile (struct objfile *objfile) | |
1999 | { | |
02d27625 MM |
2000 | DEBUG ("free objfile"); |
2001 | ||
08036331 | 2002 | for (thread_info *tp : all_non_exited_threads ()) |
02d27625 MM |
2003 | btrace_clear (tp); |
2004 | } | |
c12a2917 MM |
2005 | |
2006 | #if defined (HAVE_LIBEXPAT) | |
2007 | ||
2008 | /* Check the btrace document version. */ | |
2009 | ||
2010 | static void | |
2011 | check_xml_btrace_version (struct gdb_xml_parser *parser, | |
2012 | const struct gdb_xml_element *element, | |
4d0fdd9b SM |
2013 | void *user_data, |
2014 | std::vector<gdb_xml_value> &attributes) | |
c12a2917 | 2015 | { |
9a3c8263 | 2016 | const char *version |
4d0fdd9b | 2017 | = (const char *) xml_find_attribute (attributes, "version")->value.get (); |
c12a2917 MM |
2018 | |
2019 | if (strcmp (version, "1.0") != 0) | |
2020 | gdb_xml_error (parser, _("Unsupported btrace version: \"%s\""), version); | |
2021 | } | |
2022 | ||
2023 | /* Parse a btrace "block" xml record. */ | |
2024 | ||
2025 | static void | |
2026 | parse_xml_btrace_block (struct gdb_xml_parser *parser, | |
2027 | const struct gdb_xml_element *element, | |
4d0fdd9b SM |
2028 | void *user_data, |
2029 | std::vector<gdb_xml_value> &attributes) | |
c12a2917 | 2030 | { |
734b0e4b | 2031 | struct btrace_data *btrace; |
c12a2917 MM |
2032 | struct btrace_block *block; |
2033 | ULONGEST *begin, *end; | |
2034 | ||
9a3c8263 | 2035 | btrace = (struct btrace_data *) user_data; |
734b0e4b MM |
2036 | |
2037 | switch (btrace->format) | |
2038 | { | |
2039 | case BTRACE_FORMAT_BTS: | |
2040 | break; | |
2041 | ||
2042 | case BTRACE_FORMAT_NONE: | |
2043 | btrace->format = BTRACE_FORMAT_BTS; | |
2044 | btrace->variant.bts.blocks = NULL; | |
2045 | break; | |
2046 | ||
2047 | default: | |
2048 | gdb_xml_error (parser, _("Btrace format error.")); | |
2049 | } | |
c12a2917 | 2050 | |
4d0fdd9b SM |
2051 | begin = (ULONGEST *) xml_find_attribute (attributes, "begin")->value.get (); |
2052 | end = (ULONGEST *) xml_find_attribute (attributes, "end")->value.get (); | |
c12a2917 | 2053 | |
734b0e4b | 2054 | block = VEC_safe_push (btrace_block_s, btrace->variant.bts.blocks, NULL); |
c12a2917 MM |
2055 | block->begin = *begin; |
2056 | block->end = *end; | |
2057 | } | |
2058 | ||
b20a6524 MM |
2059 | /* Parse a "raw" xml record. */ |
2060 | ||
2061 | static void | |
2062 | parse_xml_raw (struct gdb_xml_parser *parser, const char *body_text, | |
e7b01ce0 | 2063 | gdb_byte **pdata, size_t *psize) |
b20a6524 | 2064 | { |
343b0027 | 2065 | gdb_byte *bin; |
e7b01ce0 | 2066 | size_t len, size; |
b20a6524 MM |
2067 | |
2068 | len = strlen (body_text); | |
e7b01ce0 | 2069 | if (len % 2 != 0) |
b20a6524 MM |
2070 | gdb_xml_error (parser, _("Bad raw data size.")); |
2071 | ||
e7b01ce0 MM |
2072 | size = len / 2; |
2073 | ||
343b0027 TT |
2074 | gdb::unique_xmalloc_ptr<gdb_byte> data ((gdb_byte *) xmalloc (size)); |
2075 | bin = data.get (); | |
b20a6524 MM |
2076 | |
2077 | /* We use hex encoding - see common/rsp-low.h. */ | |
2078 | while (len > 0) | |
2079 | { | |
2080 | char hi, lo; | |
2081 | ||
2082 | hi = *body_text++; | |
2083 | lo = *body_text++; | |
2084 | ||
2085 | if (hi == 0 || lo == 0) | |
2086 | gdb_xml_error (parser, _("Bad hex encoding.")); | |
2087 | ||
2088 | *bin++ = fromhex (hi) * 16 + fromhex (lo); | |
2089 | len -= 2; | |
2090 | } | |
2091 | ||
343b0027 | 2092 | *pdata = data.release (); |
b20a6524 MM |
2093 | *psize = size; |
2094 | } | |
2095 | ||
2096 | /* Parse a btrace pt-config "cpu" xml record. */ | |
2097 | ||
2098 | static void | |
2099 | parse_xml_btrace_pt_config_cpu (struct gdb_xml_parser *parser, | |
2100 | const struct gdb_xml_element *element, | |
2101 | void *user_data, | |
4d0fdd9b | 2102 | std::vector<gdb_xml_value> &attributes) |
b20a6524 MM |
2103 | { |
2104 | struct btrace_data *btrace; | |
2105 | const char *vendor; | |
2106 | ULONGEST *family, *model, *stepping; | |
2107 | ||
4d0fdd9b SM |
2108 | vendor = |
2109 | (const char *) xml_find_attribute (attributes, "vendor")->value.get (); | |
2110 | family | |
2111 | = (ULONGEST *) xml_find_attribute (attributes, "family")->value.get (); | |
2112 | model | |
2113 | = (ULONGEST *) xml_find_attribute (attributes, "model")->value.get (); | |
2114 | stepping | |
2115 | = (ULONGEST *) xml_find_attribute (attributes, "stepping")->value.get (); | |
b20a6524 | 2116 | |
9a3c8263 | 2117 | btrace = (struct btrace_data *) user_data; |
b20a6524 MM |
2118 | |
2119 | if (strcmp (vendor, "GenuineIntel") == 0) | |
2120 | btrace->variant.pt.config.cpu.vendor = CV_INTEL; | |
2121 | ||
2122 | btrace->variant.pt.config.cpu.family = *family; | |
2123 | btrace->variant.pt.config.cpu.model = *model; | |
2124 | btrace->variant.pt.config.cpu.stepping = *stepping; | |
2125 | } | |
2126 | ||
2127 | /* Parse a btrace pt "raw" xml record. */ | |
2128 | ||
2129 | static void | |
2130 | parse_xml_btrace_pt_raw (struct gdb_xml_parser *parser, | |
2131 | const struct gdb_xml_element *element, | |
2132 | void *user_data, const char *body_text) | |
2133 | { | |
2134 | struct btrace_data *btrace; | |
2135 | ||
9a3c8263 | 2136 | btrace = (struct btrace_data *) user_data; |
b20a6524 MM |
2137 | parse_xml_raw (parser, body_text, &btrace->variant.pt.data, |
2138 | &btrace->variant.pt.size); | |
2139 | } | |
2140 | ||
2141 | /* Parse a btrace "pt" xml record. */ | |
2142 | ||
2143 | static void | |
2144 | parse_xml_btrace_pt (struct gdb_xml_parser *parser, | |
2145 | const struct gdb_xml_element *element, | |
4d0fdd9b SM |
2146 | void *user_data, |
2147 | std::vector<gdb_xml_value> &attributes) | |
b20a6524 MM |
2148 | { |
2149 | struct btrace_data *btrace; | |
2150 | ||
9a3c8263 | 2151 | btrace = (struct btrace_data *) user_data; |
b20a6524 MM |
2152 | btrace->format = BTRACE_FORMAT_PT; |
2153 | btrace->variant.pt.config.cpu.vendor = CV_UNKNOWN; | |
2154 | btrace->variant.pt.data = NULL; | |
2155 | btrace->variant.pt.size = 0; | |
2156 | } | |
2157 | ||
c12a2917 MM |
2158 | static const struct gdb_xml_attribute block_attributes[] = { |
2159 | { "begin", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
2160 | { "end", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
2161 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
2162 | }; | |
2163 | ||
b20a6524 MM |
2164 | static const struct gdb_xml_attribute btrace_pt_config_cpu_attributes[] = { |
2165 | { "vendor", GDB_XML_AF_NONE, NULL, NULL }, | |
2166 | { "family", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
2167 | { "model", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
2168 | { "stepping", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
2169 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
2170 | }; | |
2171 | ||
2172 | static const struct gdb_xml_element btrace_pt_config_children[] = { | |
2173 | { "cpu", btrace_pt_config_cpu_attributes, NULL, GDB_XML_EF_OPTIONAL, | |
2174 | parse_xml_btrace_pt_config_cpu, NULL }, | |
2175 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
2176 | }; | |
2177 | ||
2178 | static const struct gdb_xml_element btrace_pt_children[] = { | |
2179 | { "pt-config", NULL, btrace_pt_config_children, GDB_XML_EF_OPTIONAL, NULL, | |
2180 | NULL }, | |
2181 | { "raw", NULL, NULL, GDB_XML_EF_OPTIONAL, NULL, parse_xml_btrace_pt_raw }, | |
2182 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
2183 | }; | |
2184 | ||
c12a2917 MM |
2185 | static const struct gdb_xml_attribute btrace_attributes[] = { |
2186 | { "version", GDB_XML_AF_NONE, NULL, NULL }, | |
2187 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
2188 | }; | |
2189 | ||
2190 | static const struct gdb_xml_element btrace_children[] = { | |
2191 | { "block", block_attributes, NULL, | |
2192 | GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, parse_xml_btrace_block, NULL }, | |
b20a6524 MM |
2193 | { "pt", NULL, btrace_pt_children, GDB_XML_EF_OPTIONAL, parse_xml_btrace_pt, |
2194 | NULL }, | |
c12a2917 MM |
2195 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } |
2196 | }; | |
2197 | ||
2198 | static const struct gdb_xml_element btrace_elements[] = { | |
2199 | { "btrace", btrace_attributes, btrace_children, GDB_XML_EF_NONE, | |
2200 | check_xml_btrace_version, NULL }, | |
2201 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
2202 | }; | |
2203 | ||
2204 | #endif /* defined (HAVE_LIBEXPAT) */ | |
2205 | ||
2206 | /* See btrace.h. */ | |
2207 | ||
734b0e4b MM |
2208 | void |
2209 | parse_xml_btrace (struct btrace_data *btrace, const char *buffer) | |
c12a2917 | 2210 | { |
c12a2917 MM |
2211 | #if defined (HAVE_LIBEXPAT) |
2212 | ||
15766370 | 2213 | int errcode; |
8dcc53b3 TT |
2214 | btrace_data result; |
2215 | result.format = BTRACE_FORMAT_NONE; | |
734b0e4b | 2216 | |
c12a2917 | 2217 | errcode = gdb_xml_parse_quick (_("btrace"), "btrace.dtd", btrace_elements, |
8dcc53b3 | 2218 | buffer, &result); |
c12a2917 | 2219 | if (errcode != 0) |
969c39fb | 2220 | error (_("Error parsing branch trace.")); |
c12a2917 MM |
2221 | |
2222 | /* Keep parse results. */ | |
8dcc53b3 | 2223 | *btrace = std::move (result); |
c12a2917 MM |
2224 | |
2225 | #else /* !defined (HAVE_LIBEXPAT) */ | |
2226 | ||
c4e12631 MM |
2227 | error (_("Cannot process branch trace. XML support was disabled at " |
2228 | "compile time.")); | |
c12a2917 MM |
2229 | |
2230 | #endif /* !defined (HAVE_LIBEXPAT) */ | |
c12a2917 | 2231 | } |
23a7fe75 | 2232 | |
f4abbc16 MM |
2233 | #if defined (HAVE_LIBEXPAT) |
2234 | ||
2235 | /* Parse a btrace-conf "bts" xml record. */ | |
2236 | ||
2237 | static void | |
2238 | parse_xml_btrace_conf_bts (struct gdb_xml_parser *parser, | |
2239 | const struct gdb_xml_element *element, | |
4d0fdd9b SM |
2240 | void *user_data, |
2241 | std::vector<gdb_xml_value> &attributes) | |
f4abbc16 MM |
2242 | { |
2243 | struct btrace_config *conf; | |
d33501a5 | 2244 | struct gdb_xml_value *size; |
f4abbc16 | 2245 | |
9a3c8263 | 2246 | conf = (struct btrace_config *) user_data; |
f4abbc16 | 2247 | conf->format = BTRACE_FORMAT_BTS; |
d33501a5 MM |
2248 | conf->bts.size = 0; |
2249 | ||
2250 | size = xml_find_attribute (attributes, "size"); | |
2251 | if (size != NULL) | |
4d0fdd9b | 2252 | conf->bts.size = (unsigned int) *(ULONGEST *) size->value.get (); |
f4abbc16 MM |
2253 | } |
2254 | ||
b20a6524 MM |
2255 | /* Parse a btrace-conf "pt" xml record. */ |
2256 | ||
2257 | static void | |
2258 | parse_xml_btrace_conf_pt (struct gdb_xml_parser *parser, | |
2259 | const struct gdb_xml_element *element, | |
4d0fdd9b SM |
2260 | void *user_data, |
2261 | std::vector<gdb_xml_value> &attributes) | |
b20a6524 MM |
2262 | { |
2263 | struct btrace_config *conf; | |
2264 | struct gdb_xml_value *size; | |
2265 | ||
9a3c8263 | 2266 | conf = (struct btrace_config *) user_data; |
b20a6524 MM |
2267 | conf->format = BTRACE_FORMAT_PT; |
2268 | conf->pt.size = 0; | |
2269 | ||
2270 | size = xml_find_attribute (attributes, "size"); | |
2271 | if (size != NULL) | |
4d0fdd9b | 2272 | conf->pt.size = (unsigned int) *(ULONGEST *) size->value.get (); |
b20a6524 MM |
2273 | } |
2274 | ||
2275 | static const struct gdb_xml_attribute btrace_conf_pt_attributes[] = { | |
2276 | { "size", GDB_XML_AF_OPTIONAL, gdb_xml_parse_attr_ulongest, NULL }, | |
2277 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
2278 | }; | |
2279 | ||
d33501a5 MM |
2280 | static const struct gdb_xml_attribute btrace_conf_bts_attributes[] = { |
2281 | { "size", GDB_XML_AF_OPTIONAL, gdb_xml_parse_attr_ulongest, NULL }, | |
2282 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
2283 | }; | |
2284 | ||
f4abbc16 | 2285 | static const struct gdb_xml_element btrace_conf_children[] = { |
d33501a5 MM |
2286 | { "bts", btrace_conf_bts_attributes, NULL, GDB_XML_EF_OPTIONAL, |
2287 | parse_xml_btrace_conf_bts, NULL }, | |
b20a6524 MM |
2288 | { "pt", btrace_conf_pt_attributes, NULL, GDB_XML_EF_OPTIONAL, |
2289 | parse_xml_btrace_conf_pt, NULL }, | |
f4abbc16 MM |
2290 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } |
2291 | }; | |
2292 | ||
2293 | static const struct gdb_xml_attribute btrace_conf_attributes[] = { | |
2294 | { "version", GDB_XML_AF_NONE, NULL, NULL }, | |
2295 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
2296 | }; | |
2297 | ||
2298 | static const struct gdb_xml_element btrace_conf_elements[] = { | |
2299 | { "btrace-conf", btrace_conf_attributes, btrace_conf_children, | |
2300 | GDB_XML_EF_NONE, NULL, NULL }, | |
2301 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
2302 | }; | |
2303 | ||
2304 | #endif /* defined (HAVE_LIBEXPAT) */ | |
2305 | ||
2306 | /* See btrace.h. */ | |
2307 | ||
2308 | void | |
2309 | parse_xml_btrace_conf (struct btrace_config *conf, const char *xml) | |
2310 | { | |
f4abbc16 MM |
2311 | #if defined (HAVE_LIBEXPAT) |
2312 | ||
15766370 | 2313 | int errcode; |
f4abbc16 MM |
2314 | errcode = gdb_xml_parse_quick (_("btrace-conf"), "btrace-conf.dtd", |
2315 | btrace_conf_elements, xml, conf); | |
2316 | if (errcode != 0) | |
2317 | error (_("Error parsing branch trace configuration.")); | |
2318 | ||
2319 | #else /* !defined (HAVE_LIBEXPAT) */ | |
2320 | ||
c4e12631 MM |
2321 | error (_("Cannot process the branch trace configuration. XML support " |
2322 | "was disabled at compile time.")); | |
f4abbc16 MM |
2323 | |
2324 | #endif /* !defined (HAVE_LIBEXPAT) */ | |
2325 | } | |
2326 | ||
23a7fe75 MM |
2327 | /* See btrace.h. */ |
2328 | ||
2329 | const struct btrace_insn * | |
2330 | btrace_insn_get (const struct btrace_insn_iterator *it) | |
2331 | { | |
2332 | const struct btrace_function *bfun; | |
2333 | unsigned int index, end; | |
2334 | ||
a0f1b963 | 2335 | index = it->insn_index; |
08c3f6d2 | 2336 | bfun = &it->btinfo->functions[it->call_index]; |
23a7fe75 | 2337 | |
31fd9caa MM |
2338 | /* Check if the iterator points to a gap in the trace. */ |
2339 | if (bfun->errcode != 0) | |
2340 | return NULL; | |
2341 | ||
23a7fe75 | 2342 | /* The index is within the bounds of this function's instruction vector. */ |
0860c437 | 2343 | end = bfun->insn.size (); |
23a7fe75 MM |
2344 | gdb_assert (0 < end); |
2345 | gdb_assert (index < end); | |
2346 | ||
0860c437 | 2347 | return &bfun->insn[index]; |
23a7fe75 MM |
2348 | } |
2349 | ||
2350 | /* See btrace.h. */ | |
2351 | ||
69090cee TW |
2352 | int |
2353 | btrace_insn_get_error (const struct btrace_insn_iterator *it) | |
23a7fe75 | 2354 | { |
08c3f6d2 | 2355 | return it->btinfo->functions[it->call_index].errcode; |
69090cee | 2356 | } |
31fd9caa | 2357 | |
69090cee | 2358 | /* See btrace.h. */ |
31fd9caa | 2359 | |
69090cee TW |
2360 | unsigned int |
2361 | btrace_insn_number (const struct btrace_insn_iterator *it) | |
2362 | { | |
08c3f6d2 | 2363 | return it->btinfo->functions[it->call_index].insn_offset + it->insn_index; |
23a7fe75 MM |
2364 | } |
2365 | ||
2366 | /* See btrace.h. */ | |
2367 | ||
2368 | void | |
2369 | btrace_insn_begin (struct btrace_insn_iterator *it, | |
2370 | const struct btrace_thread_info *btinfo) | |
2371 | { | |
b54b03bd | 2372 | if (btinfo->functions.empty ()) |
23a7fe75 MM |
2373 | error (_("No trace.")); |
2374 | ||
521103fd | 2375 | it->btinfo = btinfo; |
a0f1b963 TW |
2376 | it->call_index = 0; |
2377 | it->insn_index = 0; | |
23a7fe75 MM |
2378 | } |
2379 | ||
2380 | /* See btrace.h. */ | |
2381 | ||
2382 | void | |
2383 | btrace_insn_end (struct btrace_insn_iterator *it, | |
2384 | const struct btrace_thread_info *btinfo) | |
2385 | { | |
2386 | const struct btrace_function *bfun; | |
2387 | unsigned int length; | |
2388 | ||
b54b03bd | 2389 | if (btinfo->functions.empty ()) |
23a7fe75 MM |
2390 | error (_("No trace.")); |
2391 | ||
08c3f6d2 | 2392 | bfun = &btinfo->functions.back (); |
0860c437 | 2393 | length = bfun->insn.size (); |
23a7fe75 | 2394 | |
31fd9caa MM |
2395 | /* The last function may either be a gap or it contains the current |
2396 | instruction, which is one past the end of the execution trace; ignore | |
2397 | it. */ | |
2398 | if (length > 0) | |
2399 | length -= 1; | |
2400 | ||
521103fd | 2401 | it->btinfo = btinfo; |
a0f1b963 TW |
2402 | it->call_index = bfun->number - 1; |
2403 | it->insn_index = length; | |
23a7fe75 MM |
2404 | } |
2405 | ||
2406 | /* See btrace.h. */ | |
2407 | ||
2408 | unsigned int | |
2409 | btrace_insn_next (struct btrace_insn_iterator *it, unsigned int stride) | |
2410 | { | |
2411 | const struct btrace_function *bfun; | |
2412 | unsigned int index, steps; | |
2413 | ||
08c3f6d2 | 2414 | bfun = &it->btinfo->functions[it->call_index]; |
23a7fe75 | 2415 | steps = 0; |
a0f1b963 | 2416 | index = it->insn_index; |
23a7fe75 MM |
2417 | |
2418 | while (stride != 0) | |
2419 | { | |
2420 | unsigned int end, space, adv; | |
2421 | ||
0860c437 | 2422 | end = bfun->insn.size (); |
23a7fe75 | 2423 | |
31fd9caa MM |
2424 | /* An empty function segment represents a gap in the trace. We count |
2425 | it as one instruction. */ | |
2426 | if (end == 0) | |
2427 | { | |
2428 | const struct btrace_function *next; | |
2429 | ||
eb8f2b9c | 2430 | next = ftrace_find_call_by_number (it->btinfo, bfun->number + 1); |
31fd9caa MM |
2431 | if (next == NULL) |
2432 | break; | |
2433 | ||
2434 | stride -= 1; | |
2435 | steps += 1; | |
2436 | ||
2437 | bfun = next; | |
2438 | index = 0; | |
2439 | ||
2440 | continue; | |
2441 | } | |
2442 | ||
23a7fe75 MM |
2443 | gdb_assert (0 < end); |
2444 | gdb_assert (index < end); | |
2445 | ||
2446 | /* Compute the number of instructions remaining in this segment. */ | |
2447 | space = end - index; | |
2448 | ||
2449 | /* Advance the iterator as far as possible within this segment. */ | |
325fac50 | 2450 | adv = std::min (space, stride); |
23a7fe75 MM |
2451 | stride -= adv; |
2452 | index += adv; | |
2453 | steps += adv; | |
2454 | ||
2455 | /* Move to the next function if we're at the end of this one. */ | |
2456 | if (index == end) | |
2457 | { | |
2458 | const struct btrace_function *next; | |
2459 | ||
eb8f2b9c | 2460 | next = ftrace_find_call_by_number (it->btinfo, bfun->number + 1); |
23a7fe75 MM |
2461 | if (next == NULL) |
2462 | { | |
2463 | /* We stepped past the last function. | |
2464 | ||
2465 | Let's adjust the index to point to the last instruction in | |
2466 | the previous function. */ | |
2467 | index -= 1; | |
2468 | steps -= 1; | |
2469 | break; | |
2470 | } | |
2471 | ||
2472 | /* We now point to the first instruction in the new function. */ | |
2473 | bfun = next; | |
2474 | index = 0; | |
2475 | } | |
2476 | ||
2477 | /* We did make progress. */ | |
2478 | gdb_assert (adv > 0); | |
2479 | } | |
2480 | ||
2481 | /* Update the iterator. */ | |
a0f1b963 TW |
2482 | it->call_index = bfun->number - 1; |
2483 | it->insn_index = index; | |
23a7fe75 MM |
2484 | |
2485 | return steps; | |
2486 | } | |
2487 | ||
2488 | /* See btrace.h. */ | |
2489 | ||
2490 | unsigned int | |
2491 | btrace_insn_prev (struct btrace_insn_iterator *it, unsigned int stride) | |
2492 | { | |
2493 | const struct btrace_function *bfun; | |
2494 | unsigned int index, steps; | |
2495 | ||
08c3f6d2 | 2496 | bfun = &it->btinfo->functions[it->call_index]; |
23a7fe75 | 2497 | steps = 0; |
a0f1b963 | 2498 | index = it->insn_index; |
23a7fe75 MM |
2499 | |
2500 | while (stride != 0) | |
2501 | { | |
2502 | unsigned int adv; | |
2503 | ||
2504 | /* Move to the previous function if we're at the start of this one. */ | |
2505 | if (index == 0) | |
2506 | { | |
2507 | const struct btrace_function *prev; | |
2508 | ||
eb8f2b9c | 2509 | prev = ftrace_find_call_by_number (it->btinfo, bfun->number - 1); |
23a7fe75 MM |
2510 | if (prev == NULL) |
2511 | break; | |
2512 | ||
2513 | /* We point to one after the last instruction in the new function. */ | |
2514 | bfun = prev; | |
0860c437 | 2515 | index = bfun->insn.size (); |
23a7fe75 | 2516 | |
31fd9caa MM |
2517 | /* An empty function segment represents a gap in the trace. We count |
2518 | it as one instruction. */ | |
2519 | if (index == 0) | |
2520 | { | |
2521 | stride -= 1; | |
2522 | steps += 1; | |
2523 | ||
2524 | continue; | |
2525 | } | |
23a7fe75 MM |
2526 | } |
2527 | ||
2528 | /* Advance the iterator as far as possible within this segment. */ | |
325fac50 | 2529 | adv = std::min (index, stride); |
31fd9caa | 2530 | |
23a7fe75 MM |
2531 | stride -= adv; |
2532 | index -= adv; | |
2533 | steps += adv; | |
2534 | ||
2535 | /* We did make progress. */ | |
2536 | gdb_assert (adv > 0); | |
2537 | } | |
2538 | ||
2539 | /* Update the iterator. */ | |
a0f1b963 TW |
2540 | it->call_index = bfun->number - 1; |
2541 | it->insn_index = index; | |
23a7fe75 MM |
2542 | |
2543 | return steps; | |
2544 | } | |
2545 | ||
2546 | /* See btrace.h. */ | |
2547 | ||
2548 | int | |
2549 | btrace_insn_cmp (const struct btrace_insn_iterator *lhs, | |
2550 | const struct btrace_insn_iterator *rhs) | |
2551 | { | |
a0f1b963 | 2552 | gdb_assert (lhs->btinfo == rhs->btinfo); |
23a7fe75 | 2553 | |
a0f1b963 TW |
2554 | if (lhs->call_index != rhs->call_index) |
2555 | return lhs->call_index - rhs->call_index; | |
23a7fe75 | 2556 | |
a0f1b963 | 2557 | return lhs->insn_index - rhs->insn_index; |
23a7fe75 MM |
2558 | } |
2559 | ||
2560 | /* See btrace.h. */ | |
2561 | ||
2562 | int | |
2563 | btrace_find_insn_by_number (struct btrace_insn_iterator *it, | |
2564 | const struct btrace_thread_info *btinfo, | |
2565 | unsigned int number) | |
2566 | { | |
2567 | const struct btrace_function *bfun; | |
fdd2bd92 | 2568 | unsigned int upper, lower; |
23a7fe75 | 2569 | |
2b51eddc | 2570 | if (btinfo->functions.empty ()) |
fdd2bd92 | 2571 | return 0; |
23a7fe75 | 2572 | |
fdd2bd92 | 2573 | lower = 0; |
08c3f6d2 | 2574 | bfun = &btinfo->functions[lower]; |
fdd2bd92 | 2575 | if (number < bfun->insn_offset) |
23a7fe75 MM |
2576 | return 0; |
2577 | ||
2b51eddc | 2578 | upper = btinfo->functions.size () - 1; |
08c3f6d2 | 2579 | bfun = &btinfo->functions[upper]; |
fdd2bd92 | 2580 | if (number >= bfun->insn_offset + ftrace_call_num_insn (bfun)) |
23a7fe75 MM |
2581 | return 0; |
2582 | ||
fdd2bd92 TW |
2583 | /* We assume that there are no holes in the numbering. */ |
2584 | for (;;) | |
2585 | { | |
2586 | const unsigned int average = lower + (upper - lower) / 2; | |
2587 | ||
08c3f6d2 | 2588 | bfun = &btinfo->functions[average]; |
fdd2bd92 TW |
2589 | |
2590 | if (number < bfun->insn_offset) | |
2591 | { | |
2592 | upper = average - 1; | |
2593 | continue; | |
2594 | } | |
2595 | ||
2596 | if (number >= bfun->insn_offset + ftrace_call_num_insn (bfun)) | |
2597 | { | |
2598 | lower = average + 1; | |
2599 | continue; | |
2600 | } | |
2601 | ||
2602 | break; | |
2603 | } | |
2604 | ||
521103fd | 2605 | it->btinfo = btinfo; |
a0f1b963 TW |
2606 | it->call_index = bfun->number - 1; |
2607 | it->insn_index = number - bfun->insn_offset; | |
23a7fe75 MM |
2608 | return 1; |
2609 | } | |
2610 | ||
f158f208 TW |
2611 | /* Returns true if the recording ends with a function segment that |
2612 | contains only a single (i.e. the current) instruction. */ | |
2613 | ||
2614 | static bool | |
2615 | btrace_ends_with_single_insn (const struct btrace_thread_info *btinfo) | |
2616 | { | |
2617 | const btrace_function *bfun; | |
2618 | ||
2619 | if (btinfo->functions.empty ()) | |
2620 | return false; | |
2621 | ||
08c3f6d2 | 2622 | bfun = &btinfo->functions.back (); |
f158f208 TW |
2623 | if (bfun->errcode != 0) |
2624 | return false; | |
2625 | ||
2626 | return ftrace_call_num_insn (bfun) == 1; | |
2627 | } | |
2628 | ||
23a7fe75 MM |
2629 | /* See btrace.h. */ |
2630 | ||
2631 | const struct btrace_function * | |
2632 | btrace_call_get (const struct btrace_call_iterator *it) | |
2633 | { | |
f158f208 TW |
2634 | if (it->index >= it->btinfo->functions.size ()) |
2635 | return NULL; | |
2636 | ||
08c3f6d2 | 2637 | return &it->btinfo->functions[it->index]; |
23a7fe75 MM |
2638 | } |
2639 | ||
2640 | /* See btrace.h. */ | |
2641 | ||
2642 | unsigned int | |
2643 | btrace_call_number (const struct btrace_call_iterator *it) | |
2644 | { | |
f158f208 | 2645 | const unsigned int length = it->btinfo->functions.size (); |
23a7fe75 | 2646 | |
f158f208 TW |
2647 | /* If the last function segment contains only a single instruction (i.e. the |
2648 | current instruction), skip it. */ | |
2649 | if ((it->index == length) && btrace_ends_with_single_insn (it->btinfo)) | |
2650 | return length; | |
23a7fe75 | 2651 | |
f158f208 | 2652 | return it->index + 1; |
23a7fe75 MM |
2653 | } |
2654 | ||
2655 | /* See btrace.h. */ | |
2656 | ||
2657 | void | |
2658 | btrace_call_begin (struct btrace_call_iterator *it, | |
2659 | const struct btrace_thread_info *btinfo) | |
2660 | { | |
f158f208 | 2661 | if (btinfo->functions.empty ()) |
23a7fe75 MM |
2662 | error (_("No trace.")); |
2663 | ||
2664 | it->btinfo = btinfo; | |
f158f208 | 2665 | it->index = 0; |
23a7fe75 MM |
2666 | } |
2667 | ||
2668 | /* See btrace.h. */ | |
2669 | ||
2670 | void | |
2671 | btrace_call_end (struct btrace_call_iterator *it, | |
2672 | const struct btrace_thread_info *btinfo) | |
2673 | { | |
f158f208 | 2674 | if (btinfo->functions.empty ()) |
23a7fe75 MM |
2675 | error (_("No trace.")); |
2676 | ||
2677 | it->btinfo = btinfo; | |
f158f208 | 2678 | it->index = btinfo->functions.size (); |
23a7fe75 MM |
2679 | } |
2680 | ||
2681 | /* See btrace.h. */ | |
2682 | ||
2683 | unsigned int | |
2684 | btrace_call_next (struct btrace_call_iterator *it, unsigned int stride) | |
2685 | { | |
f158f208 | 2686 | const unsigned int length = it->btinfo->functions.size (); |
23a7fe75 | 2687 | |
f158f208 TW |
2688 | if (it->index + stride < length - 1) |
2689 | /* Default case: Simply advance the iterator. */ | |
2690 | it->index += stride; | |
2691 | else if (it->index + stride == length - 1) | |
23a7fe75 | 2692 | { |
f158f208 TW |
2693 | /* We land exactly at the last function segment. If it contains only one |
2694 | instruction (i.e. the current instruction) it is not actually part of | |
2695 | the trace. */ | |
2696 | if (btrace_ends_with_single_insn (it->btinfo)) | |
2697 | it->index = length; | |
2698 | else | |
2699 | it->index = length - 1; | |
2700 | } | |
2701 | else | |
2702 | { | |
2703 | /* We land past the last function segment and have to adjust the stride. | |
2704 | If the last function segment contains only one instruction (i.e. the | |
2705 | current instruction) it is not actually part of the trace. */ | |
2706 | if (btrace_ends_with_single_insn (it->btinfo)) | |
2707 | stride = length - it->index - 1; | |
2708 | else | |
2709 | stride = length - it->index; | |
23a7fe75 | 2710 | |
f158f208 | 2711 | it->index = length; |
23a7fe75 MM |
2712 | } |
2713 | ||
f158f208 | 2714 | return stride; |
23a7fe75 MM |
2715 | } |
2716 | ||
2717 | /* See btrace.h. */ | |
2718 | ||
2719 | unsigned int | |
2720 | btrace_call_prev (struct btrace_call_iterator *it, unsigned int stride) | |
2721 | { | |
f158f208 TW |
2722 | const unsigned int length = it->btinfo->functions.size (); |
2723 | int steps = 0; | |
23a7fe75 | 2724 | |
f158f208 | 2725 | gdb_assert (it->index <= length); |
23a7fe75 | 2726 | |
f158f208 TW |
2727 | if (stride == 0 || it->index == 0) |
2728 | return 0; | |
23a7fe75 | 2729 | |
f158f208 TW |
2730 | /* If we are at the end, the first step is a special case. If the last |
2731 | function segment contains only one instruction (i.e. the current | |
2732 | instruction) it is not actually part of the trace. To be able to step | |
2733 | over this instruction, we need at least one more function segment. */ | |
2734 | if ((it->index == length) && (length > 1)) | |
23a7fe75 | 2735 | { |
f158f208 TW |
2736 | if (btrace_ends_with_single_insn (it->btinfo)) |
2737 | it->index = length - 2; | |
2738 | else | |
2739 | it->index = length - 1; | |
23a7fe75 | 2740 | |
f158f208 TW |
2741 | steps = 1; |
2742 | stride -= 1; | |
23a7fe75 MM |
2743 | } |
2744 | ||
f158f208 TW |
2745 | stride = std::min (stride, it->index); |
2746 | ||
2747 | it->index -= stride; | |
2748 | return steps + stride; | |
23a7fe75 MM |
2749 | } |
2750 | ||
2751 | /* See btrace.h. */ | |
2752 | ||
2753 | int | |
2754 | btrace_call_cmp (const struct btrace_call_iterator *lhs, | |
2755 | const struct btrace_call_iterator *rhs) | |
2756 | { | |
f158f208 TW |
2757 | gdb_assert (lhs->btinfo == rhs->btinfo); |
2758 | return (int) (lhs->index - rhs->index); | |
23a7fe75 MM |
2759 | } |
2760 | ||
2761 | /* See btrace.h. */ | |
2762 | ||
2763 | int | |
2764 | btrace_find_call_by_number (struct btrace_call_iterator *it, | |
2765 | const struct btrace_thread_info *btinfo, | |
2766 | unsigned int number) | |
2767 | { | |
f158f208 | 2768 | const unsigned int length = btinfo->functions.size (); |
23a7fe75 | 2769 | |
f158f208 TW |
2770 | if ((number == 0) || (number > length)) |
2771 | return 0; | |
23a7fe75 | 2772 | |
f158f208 TW |
2773 | it->btinfo = btinfo; |
2774 | it->index = number - 1; | |
2775 | return 1; | |
23a7fe75 MM |
2776 | } |
2777 | ||
2778 | /* See btrace.h. */ | |
2779 | ||
2780 | void | |
2781 | btrace_set_insn_history (struct btrace_thread_info *btinfo, | |
2782 | const struct btrace_insn_iterator *begin, | |
2783 | const struct btrace_insn_iterator *end) | |
2784 | { | |
2785 | if (btinfo->insn_history == NULL) | |
8d749320 | 2786 | btinfo->insn_history = XCNEW (struct btrace_insn_history); |
23a7fe75 MM |
2787 | |
2788 | btinfo->insn_history->begin = *begin; | |
2789 | btinfo->insn_history->end = *end; | |
2790 | } | |
2791 | ||
2792 | /* See btrace.h. */ | |
2793 | ||
2794 | void | |
2795 | btrace_set_call_history (struct btrace_thread_info *btinfo, | |
2796 | const struct btrace_call_iterator *begin, | |
2797 | const struct btrace_call_iterator *end) | |
2798 | { | |
2799 | gdb_assert (begin->btinfo == end->btinfo); | |
2800 | ||
2801 | if (btinfo->call_history == NULL) | |
8d749320 | 2802 | btinfo->call_history = XCNEW (struct btrace_call_history); |
23a7fe75 MM |
2803 | |
2804 | btinfo->call_history->begin = *begin; | |
2805 | btinfo->call_history->end = *end; | |
2806 | } | |
07bbe694 MM |
2807 | |
2808 | /* See btrace.h. */ | |
2809 | ||
2810 | int | |
2811 | btrace_is_replaying (struct thread_info *tp) | |
2812 | { | |
2813 | return tp->btrace.replay != NULL; | |
2814 | } | |
6e07b1d2 MM |
2815 | |
2816 | /* See btrace.h. */ | |
2817 | ||
2818 | int | |
2819 | btrace_is_empty (struct thread_info *tp) | |
2820 | { | |
2821 | struct btrace_insn_iterator begin, end; | |
2822 | struct btrace_thread_info *btinfo; | |
2823 | ||
2824 | btinfo = &tp->btrace; | |
2825 | ||
b54b03bd | 2826 | if (btinfo->functions.empty ()) |
6e07b1d2 MM |
2827 | return 1; |
2828 | ||
2829 | btrace_insn_begin (&begin, btinfo); | |
2830 | btrace_insn_end (&end, btinfo); | |
2831 | ||
2832 | return btrace_insn_cmp (&begin, &end) == 0; | |
2833 | } | |
734b0e4b | 2834 | |
b0627500 MM |
2835 | #if defined (HAVE_LIBIPT) |
2836 | ||
2837 | /* Print a single packet. */ | |
2838 | ||
2839 | static void | |
2840 | pt_print_packet (const struct pt_packet *packet) | |
2841 | { | |
2842 | switch (packet->type) | |
2843 | { | |
2844 | default: | |
2845 | printf_unfiltered (("[??: %x]"), packet->type); | |
2846 | break; | |
2847 | ||
2848 | case ppt_psb: | |
2849 | printf_unfiltered (("psb")); | |
2850 | break; | |
2851 | ||
2852 | case ppt_psbend: | |
2853 | printf_unfiltered (("psbend")); | |
2854 | break; | |
2855 | ||
2856 | case ppt_pad: | |
2857 | printf_unfiltered (("pad")); | |
2858 | break; | |
2859 | ||
2860 | case ppt_tip: | |
2861 | printf_unfiltered (("tip %u: 0x%" PRIx64 ""), | |
2862 | packet->payload.ip.ipc, | |
2863 | packet->payload.ip.ip); | |
2864 | break; | |
2865 | ||
2866 | case ppt_tip_pge: | |
2867 | printf_unfiltered (("tip.pge %u: 0x%" PRIx64 ""), | |
2868 | packet->payload.ip.ipc, | |
2869 | packet->payload.ip.ip); | |
2870 | break; | |
2871 | ||
2872 | case ppt_tip_pgd: | |
2873 | printf_unfiltered (("tip.pgd %u: 0x%" PRIx64 ""), | |
2874 | packet->payload.ip.ipc, | |
2875 | packet->payload.ip.ip); | |
2876 | break; | |
2877 | ||
2878 | case ppt_fup: | |
2879 | printf_unfiltered (("fup %u: 0x%" PRIx64 ""), | |
2880 | packet->payload.ip.ipc, | |
2881 | packet->payload.ip.ip); | |
2882 | break; | |
2883 | ||
2884 | case ppt_tnt_8: | |
2885 | printf_unfiltered (("tnt-8 %u: 0x%" PRIx64 ""), | |
2886 | packet->payload.tnt.bit_size, | |
2887 | packet->payload.tnt.payload); | |
2888 | break; | |
2889 | ||
2890 | case ppt_tnt_64: | |
2891 | printf_unfiltered (("tnt-64 %u: 0x%" PRIx64 ""), | |
2892 | packet->payload.tnt.bit_size, | |
2893 | packet->payload.tnt.payload); | |
2894 | break; | |
2895 | ||
2896 | case ppt_pip: | |
37fdfe4c MM |
2897 | printf_unfiltered (("pip %" PRIx64 "%s"), packet->payload.pip.cr3, |
2898 | packet->payload.pip.nr ? (" nr") : ("")); | |
b0627500 MM |
2899 | break; |
2900 | ||
2901 | case ppt_tsc: | |
2902 | printf_unfiltered (("tsc %" PRIx64 ""), packet->payload.tsc.tsc); | |
2903 | break; | |
2904 | ||
2905 | case ppt_cbr: | |
2906 | printf_unfiltered (("cbr %u"), packet->payload.cbr.ratio); | |
2907 | break; | |
2908 | ||
2909 | case ppt_mode: | |
2910 | switch (packet->payload.mode.leaf) | |
2911 | { | |
2912 | default: | |
2913 | printf_unfiltered (("mode %u"), packet->payload.mode.leaf); | |
2914 | break; | |
2915 | ||
2916 | case pt_mol_exec: | |
2917 | printf_unfiltered (("mode.exec%s%s"), | |
2918 | packet->payload.mode.bits.exec.csl | |
2919 | ? (" cs.l") : (""), | |
2920 | packet->payload.mode.bits.exec.csd | |
2921 | ? (" cs.d") : ("")); | |
2922 | break; | |
2923 | ||
2924 | case pt_mol_tsx: | |
2925 | printf_unfiltered (("mode.tsx%s%s"), | |
2926 | packet->payload.mode.bits.tsx.intx | |
2927 | ? (" intx") : (""), | |
2928 | packet->payload.mode.bits.tsx.abrt | |
2929 | ? (" abrt") : ("")); | |
2930 | break; | |
2931 | } | |
2932 | break; | |
2933 | ||
2934 | case ppt_ovf: | |
2935 | printf_unfiltered (("ovf")); | |
2936 | break; | |
2937 | ||
37fdfe4c MM |
2938 | case ppt_stop: |
2939 | printf_unfiltered (("stop")); | |
2940 | break; | |
2941 | ||
2942 | case ppt_vmcs: | |
2943 | printf_unfiltered (("vmcs %" PRIx64 ""), packet->payload.vmcs.base); | |
2944 | break; | |
2945 | ||
2946 | case ppt_tma: | |
2947 | printf_unfiltered (("tma %x %x"), packet->payload.tma.ctc, | |
2948 | packet->payload.tma.fc); | |
2949 | break; | |
2950 | ||
2951 | case ppt_mtc: | |
2952 | printf_unfiltered (("mtc %x"), packet->payload.mtc.ctc); | |
2953 | break; | |
2954 | ||
2955 | case ppt_cyc: | |
2956 | printf_unfiltered (("cyc %" PRIx64 ""), packet->payload.cyc.value); | |
2957 | break; | |
2958 | ||
2959 | case ppt_mnt: | |
2960 | printf_unfiltered (("mnt %" PRIx64 ""), packet->payload.mnt.payload); | |
2961 | break; | |
b0627500 MM |
2962 | } |
2963 | } | |
2964 | ||
2965 | /* Decode packets into MAINT using DECODER. */ | |
2966 | ||
2967 | static void | |
2968 | btrace_maint_decode_pt (struct btrace_maint_info *maint, | |
2969 | struct pt_packet_decoder *decoder) | |
2970 | { | |
2971 | int errcode; | |
2972 | ||
2973 | for (;;) | |
2974 | { | |
2975 | struct btrace_pt_packet packet; | |
2976 | ||
2977 | errcode = pt_pkt_sync_forward (decoder); | |
2978 | if (errcode < 0) | |
2979 | break; | |
2980 | ||
2981 | for (;;) | |
2982 | { | |
2983 | pt_pkt_get_offset (decoder, &packet.offset); | |
2984 | ||
2985 | errcode = pt_pkt_next (decoder, &packet.packet, | |
2986 | sizeof(packet.packet)); | |
2987 | if (errcode < 0) | |
2988 | break; | |
2989 | ||
2990 | if (maint_btrace_pt_skip_pad == 0 || packet.packet.type != ppt_pad) | |
2991 | { | |
2992 | packet.errcode = pt_errcode (errcode); | |
2993 | VEC_safe_push (btrace_pt_packet_s, maint->variant.pt.packets, | |
2994 | &packet); | |
2995 | } | |
2996 | } | |
2997 | ||
2998 | if (errcode == -pte_eos) | |
2999 | break; | |
3000 | ||
3001 | packet.errcode = pt_errcode (errcode); | |
3002 | VEC_safe_push (btrace_pt_packet_s, maint->variant.pt.packets, | |
3003 | &packet); | |
3004 | ||
3005 | warning (_("Error at trace offset 0x%" PRIx64 ": %s."), | |
3006 | packet.offset, pt_errstr (packet.errcode)); | |
3007 | } | |
3008 | ||
3009 | if (errcode != -pte_eos) | |
bc504a31 | 3010 | warning (_("Failed to synchronize onto the Intel Processor Trace " |
b0627500 MM |
3011 | "stream: %s."), pt_errstr (pt_errcode (errcode))); |
3012 | } | |
3013 | ||
3014 | /* Update the packet history in BTINFO. */ | |
3015 | ||
3016 | static void | |
3017 | btrace_maint_update_pt_packets (struct btrace_thread_info *btinfo) | |
3018 | { | |
b0627500 | 3019 | struct pt_packet_decoder *decoder; |
4a4495d6 | 3020 | const struct btrace_cpu *cpu; |
b0627500 MM |
3021 | struct btrace_data_pt *pt; |
3022 | struct pt_config config; | |
3023 | int errcode; | |
3024 | ||
3025 | pt = &btinfo->data.variant.pt; | |
3026 | ||
3027 | /* Nothing to do if there is no trace. */ | |
3028 | if (pt->size == 0) | |
3029 | return; | |
3030 | ||
3031 | memset (&config, 0, sizeof(config)); | |
3032 | ||
3033 | config.size = sizeof (config); | |
3034 | config.begin = pt->data; | |
3035 | config.end = pt->data + pt->size; | |
3036 | ||
4a4495d6 MM |
3037 | cpu = record_btrace_get_cpu (); |
3038 | if (cpu == nullptr) | |
3039 | cpu = &pt->config.cpu; | |
3040 | ||
3041 | /* We treat an unknown vendor as 'no errata'. */ | |
3042 | if (cpu->vendor != CV_UNKNOWN) | |
3043 | { | |
3044 | config.cpu.vendor = pt_translate_cpu_vendor (cpu->vendor); | |
3045 | config.cpu.family = cpu->family; | |
3046 | config.cpu.model = cpu->model; | |
3047 | config.cpu.stepping = cpu->stepping; | |
b0627500 | 3048 | |
4a4495d6 MM |
3049 | errcode = pt_cpu_errata (&config.errata, &config.cpu); |
3050 | if (errcode < 0) | |
3051 | error (_("Failed to configure the Intel Processor Trace " | |
3052 | "decoder: %s."), pt_errstr (pt_errcode (errcode))); | |
3053 | } | |
b0627500 MM |
3054 | |
3055 | decoder = pt_pkt_alloc_decoder (&config); | |
3056 | if (decoder == NULL) | |
bc504a31 | 3057 | error (_("Failed to allocate the Intel Processor Trace decoder.")); |
b0627500 | 3058 | |
a70b8144 | 3059 | try |
b0627500 MM |
3060 | { |
3061 | btrace_maint_decode_pt (&btinfo->maint, decoder); | |
3062 | } | |
230d2906 | 3063 | catch (const gdb_exception &except) |
b0627500 MM |
3064 | { |
3065 | pt_pkt_free_decoder (decoder); | |
3066 | ||
3067 | if (except.reason < 0) | |
eedc3f4f | 3068 | throw; |
b0627500 | 3069 | } |
b0627500 MM |
3070 | |
3071 | pt_pkt_free_decoder (decoder); | |
3072 | } | |
3073 | ||
3074 | #endif /* !defined (HAVE_LIBIPT) */ | |
3075 | ||
3076 | /* Update the packet maintenance information for BTINFO and store the | |
3077 | low and high bounds into BEGIN and END, respectively. | |
3078 | Store the current iterator state into FROM and TO. */ | |
3079 | ||
3080 | static void | |
3081 | btrace_maint_update_packets (struct btrace_thread_info *btinfo, | |
3082 | unsigned int *begin, unsigned int *end, | |
3083 | unsigned int *from, unsigned int *to) | |
3084 | { | |
3085 | switch (btinfo->data.format) | |
3086 | { | |
3087 | default: | |
3088 | *begin = 0; | |
3089 | *end = 0; | |
3090 | *from = 0; | |
3091 | *to = 0; | |
3092 | break; | |
3093 | ||
3094 | case BTRACE_FORMAT_BTS: | |
3095 | /* Nothing to do - we operate directly on BTINFO->DATA. */ | |
3096 | *begin = 0; | |
3097 | *end = VEC_length (btrace_block_s, btinfo->data.variant.bts.blocks); | |
3098 | *from = btinfo->maint.variant.bts.packet_history.begin; | |
3099 | *to = btinfo->maint.variant.bts.packet_history.end; | |
3100 | break; | |
3101 | ||
3102 | #if defined (HAVE_LIBIPT) | |
3103 | case BTRACE_FORMAT_PT: | |
3104 | if (VEC_empty (btrace_pt_packet_s, btinfo->maint.variant.pt.packets)) | |
3105 | btrace_maint_update_pt_packets (btinfo); | |
3106 | ||
3107 | *begin = 0; | |
3108 | *end = VEC_length (btrace_pt_packet_s, btinfo->maint.variant.pt.packets); | |
3109 | *from = btinfo->maint.variant.pt.packet_history.begin; | |
3110 | *to = btinfo->maint.variant.pt.packet_history.end; | |
3111 | break; | |
3112 | #endif /* defined (HAVE_LIBIPT) */ | |
3113 | } | |
3114 | } | |
3115 | ||
3116 | /* Print packets in BTINFO from BEGIN (inclusive) until END (exclusive) and | |
3117 | update the current iterator position. */ | |
3118 | ||
3119 | static void | |
3120 | btrace_maint_print_packets (struct btrace_thread_info *btinfo, | |
3121 | unsigned int begin, unsigned int end) | |
3122 | { | |
3123 | switch (btinfo->data.format) | |
3124 | { | |
3125 | default: | |
3126 | break; | |
3127 | ||
3128 | case BTRACE_FORMAT_BTS: | |
3129 | { | |
3130 | VEC (btrace_block_s) *blocks; | |
3131 | unsigned int blk; | |
3132 | ||
3133 | blocks = btinfo->data.variant.bts.blocks; | |
3134 | for (blk = begin; blk < end; ++blk) | |
3135 | { | |
3136 | const btrace_block_s *block; | |
3137 | ||
3138 | block = VEC_index (btrace_block_s, blocks, blk); | |
3139 | ||
3140 | printf_unfiltered ("%u\tbegin: %s, end: %s\n", blk, | |
3141 | core_addr_to_string_nz (block->begin), | |
3142 | core_addr_to_string_nz (block->end)); | |
3143 | } | |
3144 | ||
3145 | btinfo->maint.variant.bts.packet_history.begin = begin; | |
3146 | btinfo->maint.variant.bts.packet_history.end = end; | |
3147 | } | |
3148 | break; | |
3149 | ||
3150 | #if defined (HAVE_LIBIPT) | |
3151 | case BTRACE_FORMAT_PT: | |
3152 | { | |
3153 | VEC (btrace_pt_packet_s) *packets; | |
3154 | unsigned int pkt; | |
3155 | ||
3156 | packets = btinfo->maint.variant.pt.packets; | |
3157 | for (pkt = begin; pkt < end; ++pkt) | |
3158 | { | |
3159 | const struct btrace_pt_packet *packet; | |
3160 | ||
3161 | packet = VEC_index (btrace_pt_packet_s, packets, pkt); | |
3162 | ||
3163 | printf_unfiltered ("%u\t", pkt); | |
3164 | printf_unfiltered ("0x%" PRIx64 "\t", packet->offset); | |
3165 | ||
3166 | if (packet->errcode == pte_ok) | |
3167 | pt_print_packet (&packet->packet); | |
3168 | else | |
3169 | printf_unfiltered ("[error: %s]", pt_errstr (packet->errcode)); | |
3170 | ||
3171 | printf_unfiltered ("\n"); | |
3172 | } | |
3173 | ||
3174 | btinfo->maint.variant.pt.packet_history.begin = begin; | |
3175 | btinfo->maint.variant.pt.packet_history.end = end; | |
3176 | } | |
3177 | break; | |
3178 | #endif /* defined (HAVE_LIBIPT) */ | |
3179 | } | |
3180 | } | |
3181 | ||
3182 | /* Read a number from an argument string. */ | |
3183 | ||
3184 | static unsigned int | |
f938677d | 3185 | get_uint (const char **arg) |
b0627500 | 3186 | { |
f938677d TT |
3187 | const char *begin, *pos; |
3188 | char *end; | |
b0627500 MM |
3189 | unsigned long number; |
3190 | ||
3191 | begin = *arg; | |
3192 | pos = skip_spaces (begin); | |
3193 | ||
3194 | if (!isdigit (*pos)) | |
3195 | error (_("Expected positive number, got: %s."), pos); | |
3196 | ||
3197 | number = strtoul (pos, &end, 10); | |
3198 | if (number > UINT_MAX) | |
3199 | error (_("Number too big.")); | |
3200 | ||
3201 | *arg += (end - begin); | |
3202 | ||
3203 | return (unsigned int) number; | |
3204 | } | |
3205 | ||
3206 | /* Read a context size from an argument string. */ | |
3207 | ||
3208 | static int | |
f938677d | 3209 | get_context_size (const char **arg) |
b0627500 | 3210 | { |
f938677d | 3211 | const char *pos = skip_spaces (*arg); |
b0627500 MM |
3212 | |
3213 | if (!isdigit (*pos)) | |
3214 | error (_("Expected positive number, got: %s."), pos); | |
3215 | ||
f938677d TT |
3216 | char *end; |
3217 | long result = strtol (pos, &end, 10); | |
3218 | *arg = end; | |
3219 | return result; | |
b0627500 MM |
3220 | } |
3221 | ||
3222 | /* Complain about junk at the end of an argument string. */ | |
3223 | ||
3224 | static void | |
f938677d | 3225 | no_chunk (const char *arg) |
b0627500 MM |
3226 | { |
3227 | if (*arg != 0) | |
3228 | error (_("Junk after argument: %s."), arg); | |
3229 | } | |
3230 | ||
3231 | /* The "maintenance btrace packet-history" command. */ | |
3232 | ||
3233 | static void | |
f938677d | 3234 | maint_btrace_packet_history_cmd (const char *arg, int from_tty) |
b0627500 MM |
3235 | { |
3236 | struct btrace_thread_info *btinfo; | |
b0627500 MM |
3237 | unsigned int size, begin, end, from, to; |
3238 | ||
00431a78 | 3239 | thread_info *tp = find_thread_ptid (inferior_ptid); |
b0627500 MM |
3240 | if (tp == NULL) |
3241 | error (_("No thread.")); | |
3242 | ||
3243 | size = 10; | |
3244 | btinfo = &tp->btrace; | |
3245 | ||
3246 | btrace_maint_update_packets (btinfo, &begin, &end, &from, &to); | |
3247 | if (begin == end) | |
3248 | { | |
3249 | printf_unfiltered (_("No trace.\n")); | |
3250 | return; | |
3251 | } | |
3252 | ||
3253 | if (arg == NULL || *arg == 0 || strcmp (arg, "+") == 0) | |
3254 | { | |
3255 | from = to; | |
3256 | ||
3257 | if (end - from < size) | |
3258 | size = end - from; | |
3259 | to = from + size; | |
3260 | } | |
3261 | else if (strcmp (arg, "-") == 0) | |
3262 | { | |
3263 | to = from; | |
3264 | ||
3265 | if (to - begin < size) | |
3266 | size = to - begin; | |
3267 | from = to - size; | |
3268 | } | |
3269 | else | |
3270 | { | |
3271 | from = get_uint (&arg); | |
3272 | if (end <= from) | |
3273 | error (_("'%u' is out of range."), from); | |
3274 | ||
3275 | arg = skip_spaces (arg); | |
3276 | if (*arg == ',') | |
3277 | { | |
3278 | arg = skip_spaces (++arg); | |
3279 | ||
3280 | if (*arg == '+') | |
3281 | { | |
3282 | arg += 1; | |
3283 | size = get_context_size (&arg); | |
3284 | ||
3285 | no_chunk (arg); | |
3286 | ||
3287 | if (end - from < size) | |
3288 | size = end - from; | |
3289 | to = from + size; | |
3290 | } | |
3291 | else if (*arg == '-') | |
3292 | { | |
3293 | arg += 1; | |
3294 | size = get_context_size (&arg); | |
3295 | ||
3296 | no_chunk (arg); | |
3297 | ||
3298 | /* Include the packet given as first argument. */ | |
3299 | from += 1; | |
3300 | to = from; | |
3301 | ||
3302 | if (to - begin < size) | |
3303 | size = to - begin; | |
3304 | from = to - size; | |
3305 | } | |
3306 | else | |
3307 | { | |
3308 | to = get_uint (&arg); | |
3309 | ||
3310 | /* Include the packet at the second argument and silently | |
3311 | truncate the range. */ | |
3312 | if (to < end) | |
3313 | to += 1; | |
3314 | else | |
3315 | to = end; | |
3316 | ||
3317 | no_chunk (arg); | |
3318 | } | |
3319 | } | |
3320 | else | |
3321 | { | |
3322 | no_chunk (arg); | |
3323 | ||
3324 | if (end - from < size) | |
3325 | size = end - from; | |
3326 | to = from + size; | |
3327 | } | |
3328 | ||
3329 | dont_repeat (); | |
3330 | } | |
3331 | ||
3332 | btrace_maint_print_packets (btinfo, from, to); | |
3333 | } | |
3334 | ||
3335 | /* The "maintenance btrace clear-packet-history" command. */ | |
3336 | ||
3337 | static void | |
f938677d | 3338 | maint_btrace_clear_packet_history_cmd (const char *args, int from_tty) |
b0627500 | 3339 | { |
b0627500 MM |
3340 | if (args != NULL && *args != 0) |
3341 | error (_("Invalid argument.")); | |
3342 | ||
00431a78 | 3343 | if (inferior_ptid == null_ptid) |
b0627500 MM |
3344 | error (_("No thread.")); |
3345 | ||
00431a78 PA |
3346 | thread_info *tp = inferior_thread (); |
3347 | btrace_thread_info *btinfo = &tp->btrace; | |
b0627500 MM |
3348 | |
3349 | /* Must clear the maint data before - it depends on BTINFO->DATA. */ | |
3350 | btrace_maint_clear (btinfo); | |
8dcc53b3 | 3351 | btinfo->data.clear (); |
b0627500 MM |
3352 | } |
3353 | ||
3354 | /* The "maintenance btrace clear" command. */ | |
3355 | ||
3356 | static void | |
f938677d | 3357 | maint_btrace_clear_cmd (const char *args, int from_tty) |
b0627500 | 3358 | { |
b0627500 MM |
3359 | if (args != NULL && *args != 0) |
3360 | error (_("Invalid argument.")); | |
3361 | ||
00431a78 | 3362 | if (inferior_ptid == null_ptid) |
b0627500 MM |
3363 | error (_("No thread.")); |
3364 | ||
00431a78 | 3365 | thread_info *tp = inferior_thread (); |
b0627500 MM |
3366 | btrace_clear (tp); |
3367 | } | |
3368 | ||
3369 | /* The "maintenance btrace" command. */ | |
3370 | ||
3371 | static void | |
981a3fb3 | 3372 | maint_btrace_cmd (const char *args, int from_tty) |
b0627500 MM |
3373 | { |
3374 | help_list (maint_btrace_cmdlist, "maintenance btrace ", all_commands, | |
3375 | gdb_stdout); | |
3376 | } | |
3377 | ||
3378 | /* The "maintenance set btrace" command. */ | |
3379 | ||
3380 | static void | |
981a3fb3 | 3381 | maint_btrace_set_cmd (const char *args, int from_tty) |
b0627500 MM |
3382 | { |
3383 | help_list (maint_btrace_set_cmdlist, "maintenance set btrace ", all_commands, | |
3384 | gdb_stdout); | |
3385 | } | |
3386 | ||
3387 | /* The "maintenance show btrace" command. */ | |
3388 | ||
3389 | static void | |
981a3fb3 | 3390 | maint_btrace_show_cmd (const char *args, int from_tty) |
b0627500 MM |
3391 | { |
3392 | help_list (maint_btrace_show_cmdlist, "maintenance show btrace ", | |
3393 | all_commands, gdb_stdout); | |
3394 | } | |
3395 | ||
3396 | /* The "maintenance set btrace pt" command. */ | |
3397 | ||
3398 | static void | |
981a3fb3 | 3399 | maint_btrace_pt_set_cmd (const char *args, int from_tty) |
b0627500 MM |
3400 | { |
3401 | help_list (maint_btrace_pt_set_cmdlist, "maintenance set btrace pt ", | |
3402 | all_commands, gdb_stdout); | |
3403 | } | |
3404 | ||
3405 | /* The "maintenance show btrace pt" command. */ | |
3406 | ||
3407 | static void | |
981a3fb3 | 3408 | maint_btrace_pt_show_cmd (const char *args, int from_tty) |
b0627500 MM |
3409 | { |
3410 | help_list (maint_btrace_pt_show_cmdlist, "maintenance show btrace pt ", | |
3411 | all_commands, gdb_stdout); | |
3412 | } | |
3413 | ||
3414 | /* The "maintenance info btrace" command. */ | |
3415 | ||
3416 | static void | |
f938677d | 3417 | maint_info_btrace_cmd (const char *args, int from_tty) |
b0627500 MM |
3418 | { |
3419 | struct btrace_thread_info *btinfo; | |
b0627500 MM |
3420 | const struct btrace_config *conf; |
3421 | ||
3422 | if (args != NULL && *args != 0) | |
3423 | error (_("Invalid argument.")); | |
3424 | ||
00431a78 | 3425 | if (inferior_ptid == null_ptid) |
b0627500 MM |
3426 | error (_("No thread.")); |
3427 | ||
00431a78 PA |
3428 | thread_info *tp = inferior_thread (); |
3429 | ||
b0627500 MM |
3430 | btinfo = &tp->btrace; |
3431 | ||
3432 | conf = btrace_conf (btinfo); | |
3433 | if (conf == NULL) | |
3434 | error (_("No btrace configuration.")); | |
3435 | ||
3436 | printf_unfiltered (_("Format: %s.\n"), | |
3437 | btrace_format_string (conf->format)); | |
3438 | ||
3439 | switch (conf->format) | |
3440 | { | |
3441 | default: | |
3442 | break; | |
3443 | ||
3444 | case BTRACE_FORMAT_BTS: | |
3445 | printf_unfiltered (_("Number of packets: %u.\n"), | |
3446 | VEC_length (btrace_block_s, | |
3447 | btinfo->data.variant.bts.blocks)); | |
3448 | break; | |
3449 | ||
3450 | #if defined (HAVE_LIBIPT) | |
3451 | case BTRACE_FORMAT_PT: | |
3452 | { | |
3453 | struct pt_version version; | |
3454 | ||
3455 | version = pt_library_version (); | |
3456 | printf_unfiltered (_("Version: %u.%u.%u%s.\n"), version.major, | |
3457 | version.minor, version.build, | |
3458 | version.ext != NULL ? version.ext : ""); | |
3459 | ||
3460 | btrace_maint_update_pt_packets (btinfo); | |
3461 | printf_unfiltered (_("Number of packets: %u.\n"), | |
3462 | VEC_length (btrace_pt_packet_s, | |
3463 | btinfo->maint.variant.pt.packets)); | |
3464 | } | |
3465 | break; | |
3466 | #endif /* defined (HAVE_LIBIPT) */ | |
3467 | } | |
3468 | } | |
3469 | ||
3470 | /* The "maint show btrace pt skip-pad" show value function. */ | |
3471 | ||
3472 | static void | |
3473 | show_maint_btrace_pt_skip_pad (struct ui_file *file, int from_tty, | |
3474 | struct cmd_list_element *c, | |
3475 | const char *value) | |
3476 | { | |
3477 | fprintf_filtered (file, _("Skip PAD packets is %s.\n"), value); | |
3478 | } | |
3479 | ||
3480 | ||
3481 | /* Initialize btrace maintenance commands. */ | |
3482 | ||
b0627500 MM |
3483 | void |
3484 | _initialize_btrace (void) | |
3485 | { | |
3486 | add_cmd ("btrace", class_maintenance, maint_info_btrace_cmd, | |
3487 | _("Info about branch tracing data."), &maintenanceinfolist); | |
3488 | ||
3489 | add_prefix_cmd ("btrace", class_maintenance, maint_btrace_cmd, | |
3490 | _("Branch tracing maintenance commands."), | |
3491 | &maint_btrace_cmdlist, "maintenance btrace ", | |
3492 | 0, &maintenancelist); | |
3493 | ||
3494 | add_prefix_cmd ("btrace", class_maintenance, maint_btrace_set_cmd, _("\ | |
3495 | Set branch tracing specific variables."), | |
3496 | &maint_btrace_set_cmdlist, "maintenance set btrace ", | |
3497 | 0, &maintenance_set_cmdlist); | |
3498 | ||
3499 | add_prefix_cmd ("pt", class_maintenance, maint_btrace_pt_set_cmd, _("\ | |
bc504a31 | 3500 | Set Intel Processor Trace specific variables."), |
b0627500 MM |
3501 | &maint_btrace_pt_set_cmdlist, "maintenance set btrace pt ", |
3502 | 0, &maint_btrace_set_cmdlist); | |
3503 | ||
3504 | add_prefix_cmd ("btrace", class_maintenance, maint_btrace_show_cmd, _("\ | |
3505 | Show branch tracing specific variables."), | |
3506 | &maint_btrace_show_cmdlist, "maintenance show btrace ", | |
3507 | 0, &maintenance_show_cmdlist); | |
3508 | ||
3509 | add_prefix_cmd ("pt", class_maintenance, maint_btrace_pt_show_cmd, _("\ | |
bc504a31 | 3510 | Show Intel Processor Trace specific variables."), |
b0627500 MM |
3511 | &maint_btrace_pt_show_cmdlist, "maintenance show btrace pt ", |
3512 | 0, &maint_btrace_show_cmdlist); | |
3513 | ||
3514 | add_setshow_boolean_cmd ("skip-pad", class_maintenance, | |
3515 | &maint_btrace_pt_skip_pad, _("\ | |
3516 | Set whether PAD packets should be skipped in the btrace packet history."), _("\ | |
3517 | Show whether PAD packets should be skipped in the btrace packet history."),_("\ | |
3518 | When enabled, PAD packets are ignored in the btrace packet history."), | |
3519 | NULL, show_maint_btrace_pt_skip_pad, | |
3520 | &maint_btrace_pt_set_cmdlist, | |
3521 | &maint_btrace_pt_show_cmdlist); | |
3522 | ||
3523 | add_cmd ("packet-history", class_maintenance, maint_btrace_packet_history_cmd, | |
3524 | _("Print the raw branch tracing data.\n\ | |
3525 | With no argument, print ten more packets after the previous ten-line print.\n\ | |
3526 | With '-' as argument print ten packets before a previous ten-line print.\n\ | |
3527 | One argument specifies the starting packet of a ten-line print.\n\ | |
3528 | Two arguments with comma between specify starting and ending packets to \ | |
3529 | print.\n\ | |
3530 | Preceded with '+'/'-' the second argument specifies the distance from the \ | |
3531 | first.\n"), | |
3532 | &maint_btrace_cmdlist); | |
3533 | ||
3534 | add_cmd ("clear-packet-history", class_maintenance, | |
3535 | maint_btrace_clear_packet_history_cmd, | |
3536 | _("Clears the branch tracing packet history.\n\ | |
3537 | Discards the raw branch tracing data but not the execution history data.\n\ | |
3538 | "), | |
3539 | &maint_btrace_cmdlist); | |
3540 | ||
3541 | add_cmd ("clear", class_maintenance, maint_btrace_clear_cmd, | |
3542 | _("Clears the branch tracing data.\n\ | |
3543 | Discards the raw branch tracing data and the execution history data.\n\ | |
3544 | The next 'record' command will fetch the branch tracing data anew.\n\ | |
3545 | "), | |
3546 | &maint_btrace_cmdlist); | |
3547 | ||
3548 | } |