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219f2f23 | 1 | /* Tracepoint code for remote server for GDB. |
7b6bb8da | 2 | Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc. |
219f2f23 PA |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include "server.h" | |
20 | #include <ctype.h> | |
21 | #include <fcntl.h> | |
22 | #include <unistd.h> | |
23 | #include <sys/time.h> | |
fa593d66 | 24 | #include <stddef.h> |
fa593d66 PA |
25 | #if HAVE_STDINT_H |
26 | #include <stdint.h> | |
27 | #endif | |
219f2f23 | 28 | |
fa593d66 PA |
29 | /* This file is built for both both GDBserver, and the in-process |
30 | agent (IPA), a shared library that includes a tracing agent that is | |
31 | loaded by the inferior to support fast tracepoints. Fast | |
32 | tracepoints (or more accurately, jump based tracepoints) are | |
33 | implemented by patching the tracepoint location with a jump into a | |
34 | small trampoline function whose job is to save the register state, | |
35 | call the in-process tracing agent, and then execute the original | |
36 | instruction that was under the tracepoint jump (possibly adjusted, | |
37 | if PC-relative, or some such). | |
38 | ||
39 | The current synchronization design is pull based. That means, | |
40 | GDBserver does most of the work, by peeking/poking at the inferior | |
41 | agent's memory directly for downloading tracepoint and associated | |
42 | objects, and for uploading trace frames. Whenever the IPA needs | |
43 | something from GDBserver (trace buffer is full, tracing stopped for | |
44 | some reason, etc.) the IPA calls a corresponding hook function | |
45 | where GDBserver has placed a breakpoint. | |
46 | ||
47 | Each of the agents has its own trace buffer. When browsing the | |
48 | trace frames built from slow and fast tracepoints from GDB (tfind | |
49 | mode), there's no guarantee the user is seeing the trace frames in | |
50 | strict chronological creation order, although, GDBserver tries to | |
51 | keep the order relatively reasonable, by syncing the trace buffers | |
52 | at appropriate times. | |
53 | ||
54 | */ | |
55 | ||
56 | static void trace_vdebug (const char *, ...) ATTR_FORMAT (printf, 1, 2); | |
219f2f23 PA |
57 | |
58 | static void | |
fa593d66 | 59 | trace_vdebug (const char *fmt, ...) |
219f2f23 PA |
60 | { |
61 | char buf[1024]; | |
62 | va_list ap; | |
63 | ||
64 | va_start (ap, fmt); | |
65 | vsprintf (buf, fmt, ap); | |
66 | fprintf (stderr, "gdbserver/tracepoint: %s\n", buf); | |
67 | va_end (ap); | |
68 | } | |
69 | ||
fa593d66 | 70 | #define trace_debug_1(level, fmt, args...) \ |
219f2f23 | 71 | do { \ |
fa593d66 PA |
72 | if (level <= debug_threads) \ |
73 | trace_vdebug ((fmt), ##args); \ | |
219f2f23 PA |
74 | } while (0) |
75 | ||
fa593d66 PA |
76 | #define trace_debug(FMT, args...) \ |
77 | trace_debug_1 (1, FMT, ##args) | |
78 | ||
79 | #if defined(__GNUC__) | |
80 | # define ATTR_USED __attribute__((used)) | |
81 | # define ATTR_NOINLINE __attribute__((noinline)) | |
82 | # define ATTR_CONSTRUCTOR __attribute__ ((constructor)) | |
83 | #else | |
84 | # define ATTR_USED | |
85 | # define ATTR_NOINLINE | |
86 | # define ATTR_CONSTRUCTOR | |
87 | #endif | |
88 | ||
89 | /* Make sure the functions the IPA needs to export (symbols GDBserver | |
90 | needs to query GDB about) are exported. */ | |
91 | ||
92 | #ifdef IN_PROCESS_AGENT | |
93 | # if defined _WIN32 || defined __CYGWIN__ | |
94 | # define IP_AGENT_EXPORT __declspec(dllexport) ATTR_USED | |
95 | # else | |
96 | # if __GNUC__ >= 4 | |
97 | # define IP_AGENT_EXPORT \ | |
98 | __attribute__ ((visibility("default"))) ATTR_USED | |
99 | # else | |
100 | # define IP_AGENT_EXPORT ATTR_USED | |
101 | # endif | |
102 | # endif | |
103 | #else | |
104 | # define IP_AGENT_EXPORT | |
105 | #endif | |
106 | ||
107 | /* Prefix exported symbols, for good citizenship. All the symbols | |
108 | that need exporting are defined in this module. */ | |
109 | #ifdef IN_PROCESS_AGENT | |
110 | # define gdb_tp_heap_buffer gdb_agent_gdb_tp_heap_buffer | |
111 | # define gdb_jump_pad_buffer gdb_agent_gdb_jump_pad_buffer | |
112 | # define gdb_jump_pad_buffer_end gdb_agent_gdb_jump_pad_buffer_end | |
113 | # define collecting gdb_agent_collecting | |
114 | # define gdb_collect gdb_agent_gdb_collect | |
115 | # define stop_tracing gdb_agent_stop_tracing | |
116 | # define flush_trace_buffer gdb_agent_flush_trace_buffer | |
117 | # define about_to_request_buffer_space gdb_agent_about_to_request_buffer_space | |
118 | # define trace_buffer_is_full gdb_agent_trace_buffer_is_full | |
119 | # define stopping_tracepoint gdb_agent_stopping_tracepoint | |
120 | # define expr_eval_result gdb_agent_expr_eval_result | |
121 | # define error_tracepoint gdb_agent_error_tracepoint | |
122 | # define tracepoints gdb_agent_tracepoints | |
123 | # define tracing gdb_agent_tracing | |
124 | # define trace_buffer_ctrl gdb_agent_trace_buffer_ctrl | |
125 | # define trace_buffer_ctrl_curr gdb_agent_trace_buffer_ctrl_curr | |
126 | # define trace_buffer_lo gdb_agent_trace_buffer_lo | |
127 | # define trace_buffer_hi gdb_agent_trace_buffer_hi | |
128 | # define traceframe_read_count gdb_agent_traceframe_read_count | |
129 | # define traceframe_write_count gdb_agent_traceframe_write_count | |
130 | # define traceframes_created gdb_agent_traceframes_created | |
131 | # define trace_state_variables gdb_agent_trace_state_variables | |
6a271cae | 132 | # define get_raw_reg gdb_agent_get_raw_reg |
493e2a69 MS |
133 | # define get_trace_state_variable_value \ |
134 | gdb_agent_get_trace_state_variable_value | |
135 | # define set_trace_state_variable_value \ | |
136 | gdb_agent_set_trace_state_variable_value | |
0fb4aa4b PA |
137 | # define ust_loaded gdb_agent_ust_loaded |
138 | # define helper_thread_id gdb_agent_helper_thread_id | |
139 | # define cmd_buf gdb_agent_cmd_buf | |
fa593d66 PA |
140 | #endif |
141 | ||
142 | #ifndef IN_PROCESS_AGENT | |
143 | ||
144 | /* Addresses of in-process agent's symbols GDBserver cares about. */ | |
145 | ||
146 | struct ipa_sym_addresses | |
147 | { | |
148 | CORE_ADDR addr_gdb_tp_heap_buffer; | |
149 | CORE_ADDR addr_gdb_jump_pad_buffer; | |
150 | CORE_ADDR addr_gdb_jump_pad_buffer_end; | |
151 | CORE_ADDR addr_collecting; | |
152 | CORE_ADDR addr_gdb_collect; | |
153 | CORE_ADDR addr_stop_tracing; | |
154 | CORE_ADDR addr_flush_trace_buffer; | |
155 | CORE_ADDR addr_about_to_request_buffer_space; | |
156 | CORE_ADDR addr_trace_buffer_is_full; | |
157 | CORE_ADDR addr_stopping_tracepoint; | |
158 | CORE_ADDR addr_expr_eval_result; | |
159 | CORE_ADDR addr_error_tracepoint; | |
160 | CORE_ADDR addr_tracepoints; | |
161 | CORE_ADDR addr_tracing; | |
162 | CORE_ADDR addr_trace_buffer_ctrl; | |
163 | CORE_ADDR addr_trace_buffer_ctrl_curr; | |
164 | CORE_ADDR addr_trace_buffer_lo; | |
165 | CORE_ADDR addr_trace_buffer_hi; | |
166 | CORE_ADDR addr_traceframe_read_count; | |
167 | CORE_ADDR addr_traceframe_write_count; | |
168 | CORE_ADDR addr_traceframes_created; | |
169 | CORE_ADDR addr_trace_state_variables; | |
6a271cae PA |
170 | CORE_ADDR addr_get_raw_reg; |
171 | CORE_ADDR addr_get_trace_state_variable_value; | |
172 | CORE_ADDR addr_set_trace_state_variable_value; | |
0fb4aa4b PA |
173 | CORE_ADDR addr_ust_loaded; |
174 | CORE_ADDR addr_helper_thread_id; | |
175 | CORE_ADDR addr_cmd_buf; | |
fa593d66 PA |
176 | }; |
177 | ||
178 | #define STRINGIZE_1(STR) #STR | |
179 | #define STRINGIZE(STR) STRINGIZE_1(STR) | |
493e2a69 | 180 | #define IPA_SYM(SYM) \ |
fa593d66 PA |
181 | { \ |
182 | STRINGIZE (gdb_agent_ ## SYM), \ | |
183 | offsetof (struct ipa_sym_addresses, addr_ ## SYM) \ | |
184 | } | |
185 | ||
186 | static struct | |
187 | { | |
188 | const char *name; | |
189 | int offset; | |
190 | int required; | |
191 | } symbol_list[] = { | |
192 | IPA_SYM(gdb_tp_heap_buffer), | |
193 | IPA_SYM(gdb_jump_pad_buffer), | |
194 | IPA_SYM(gdb_jump_pad_buffer_end), | |
195 | IPA_SYM(collecting), | |
196 | IPA_SYM(gdb_collect), | |
197 | IPA_SYM(stop_tracing), | |
198 | IPA_SYM(flush_trace_buffer), | |
199 | IPA_SYM(about_to_request_buffer_space), | |
200 | IPA_SYM(trace_buffer_is_full), | |
201 | IPA_SYM(stopping_tracepoint), | |
202 | IPA_SYM(expr_eval_result), | |
203 | IPA_SYM(error_tracepoint), | |
204 | IPA_SYM(tracepoints), | |
205 | IPA_SYM(tracing), | |
206 | IPA_SYM(trace_buffer_ctrl), | |
207 | IPA_SYM(trace_buffer_ctrl_curr), | |
208 | IPA_SYM(trace_buffer_lo), | |
209 | IPA_SYM(trace_buffer_hi), | |
210 | IPA_SYM(traceframe_read_count), | |
211 | IPA_SYM(traceframe_write_count), | |
212 | IPA_SYM(traceframes_created), | |
213 | IPA_SYM(trace_state_variables), | |
6a271cae PA |
214 | IPA_SYM(get_raw_reg), |
215 | IPA_SYM(get_trace_state_variable_value), | |
216 | IPA_SYM(set_trace_state_variable_value), | |
0fb4aa4b PA |
217 | IPA_SYM(ust_loaded), |
218 | IPA_SYM(helper_thread_id), | |
219 | IPA_SYM(cmd_buf), | |
fa593d66 PA |
220 | }; |
221 | ||
222 | struct ipa_sym_addresses ipa_sym_addrs; | |
223 | ||
224 | int all_tracepoint_symbols_looked_up; | |
225 | ||
226 | int | |
227 | in_process_agent_loaded (void) | |
228 | { | |
229 | return all_tracepoint_symbols_looked_up; | |
230 | } | |
231 | ||
232 | static int read_inferior_integer (CORE_ADDR symaddr, int *val); | |
233 | ||
0fb4aa4b PA |
234 | /* Returns true if both the in-process agent library and the static |
235 | tracepoints libraries are loaded in the inferior. */ | |
236 | ||
237 | static int | |
238 | in_process_agent_loaded_ust (void) | |
239 | { | |
240 | int loaded = 0; | |
241 | ||
242 | if (!in_process_agent_loaded ()) | |
243 | { | |
244 | warning ("In-process agent not loaded"); | |
245 | return 0; | |
246 | } | |
247 | ||
248 | if (read_inferior_integer (ipa_sym_addrs.addr_ust_loaded, &loaded)) | |
249 | { | |
250 | warning ("Error reading ust_loaded in lib"); | |
251 | return 0; | |
252 | } | |
253 | ||
254 | return loaded; | |
255 | } | |
256 | ||
fa593d66 PA |
257 | static void |
258 | write_e_ipa_not_loaded (char *buffer) | |
259 | { | |
260 | sprintf (buffer, | |
261 | "E.In-process agent library not loaded in process. " | |
0fb4aa4b PA |
262 | "Fast and static tracepoints unavailable."); |
263 | } | |
264 | ||
265 | /* Write an error to BUFFER indicating that UST isn't loaded in the | |
266 | inferior. */ | |
267 | ||
268 | static void | |
269 | write_e_ust_not_loaded (char *buffer) | |
270 | { | |
271 | #ifdef HAVE_UST | |
272 | sprintf (buffer, | |
273 | "E.UST library not loaded in process. " | |
274 | "Static tracepoints unavailable."); | |
275 | #else | |
276 | sprintf (buffer, "E.GDBserver was built without static tracepoints support"); | |
277 | #endif | |
fa593d66 PA |
278 | } |
279 | ||
0fb4aa4b PA |
280 | /* If the in-process agent library isn't loaded in the inferior, write |
281 | an error to BUFFER, and return 1. Otherwise, return 0. */ | |
282 | ||
fa593d66 PA |
283 | static int |
284 | maybe_write_ipa_not_loaded (char *buffer) | |
285 | { | |
286 | if (!in_process_agent_loaded ()) | |
287 | { | |
288 | write_e_ipa_not_loaded (buffer); | |
289 | return 1; | |
290 | } | |
291 | return 0; | |
292 | } | |
293 | ||
0fb4aa4b PA |
294 | /* If the in-process agent library and the ust (static tracepoints) |
295 | library aren't loaded in the inferior, write an error to BUFFER, | |
296 | and return 1. Otherwise, return 0. */ | |
297 | ||
298 | static int | |
299 | maybe_write_ipa_ust_not_loaded (char *buffer) | |
300 | { | |
301 | if (!in_process_agent_loaded ()) | |
302 | { | |
303 | write_e_ipa_not_loaded (buffer); | |
304 | return 1; | |
305 | } | |
306 | else if (!in_process_agent_loaded_ust ()) | |
307 | { | |
308 | write_e_ust_not_loaded (buffer); | |
309 | return 1; | |
310 | } | |
311 | return 0; | |
312 | } | |
313 | ||
fa593d66 PA |
314 | /* Cache all future symbols that the tracepoints module might request. |
315 | We can not request symbols at arbitrary states in the remote | |
316 | protocol, only when the client tells us that new symbols are | |
317 | available. So when we load the in-process library, make sure to | |
318 | check the entire list. */ | |
319 | ||
320 | void | |
321 | tracepoint_look_up_symbols (void) | |
322 | { | |
323 | int all_ok; | |
324 | int i; | |
325 | ||
326 | if (all_tracepoint_symbols_looked_up) | |
327 | return; | |
328 | ||
329 | all_ok = 1; | |
330 | for (i = 0; i < sizeof (symbol_list) / sizeof (symbol_list[0]); i++) | |
331 | { | |
332 | CORE_ADDR *addrp = | |
333 | (CORE_ADDR *) ((char *) &ipa_sym_addrs + symbol_list[i].offset); | |
334 | ||
335 | if (look_up_one_symbol (symbol_list[i].name, addrp, 1) == 0) | |
336 | { | |
337 | if (debug_threads) | |
338 | fprintf (stderr, "symbol `%s' not found\n", symbol_list[i].name); | |
339 | all_ok = 0; | |
340 | } | |
341 | } | |
342 | ||
343 | all_tracepoint_symbols_looked_up = all_ok; | |
344 | } | |
345 | ||
346 | #endif | |
347 | ||
348 | /* GDBserver places a breakpoint on the IPA's version (which is a nop) | |
349 | of the "stop_tracing" function. When this breakpoint is hit, | |
350 | tracing stopped in the IPA for some reason. E.g., due to | |
351 | tracepoint reaching the pass count, hitting conditional expression | |
352 | evaluation error, etc. | |
353 | ||
354 | The IPA's trace buffer is never in circular tracing mode: instead, | |
355 | GDBserver's is, and whenever the in-process buffer fills, it calls | |
356 | "flush_trace_buffer", which triggers an internal breakpoint. | |
357 | GDBserver reacts to this breakpoint by pulling the meanwhile | |
358 | collected data. Old frames discarding is always handled on the | |
359 | GDBserver side. */ | |
360 | ||
361 | #ifdef IN_PROCESS_AGENT | |
362 | int debug_threads = 0; | |
363 | ||
364 | int | |
365 | read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) | |
366 | { | |
367 | memcpy (myaddr, (void *) (uintptr_t) memaddr, len); | |
368 | return 0; | |
369 | } | |
370 | ||
371 | /* Call this in the functions where GDBserver places a breakpoint, so | |
372 | that the compiler doesn't try to be clever and skip calling the | |
373 | function at all. This is necessary, even if we tell the compiler | |
374 | to not inline said functions. */ | |
375 | ||
376 | #if defined(__GNUC__) | |
377 | # define UNKNOWN_SIDE_EFFECTS() asm ("") | |
378 | #else | |
379 | # define UNKNOWN_SIDE_EFFECTS() do {} while (0) | |
380 | #endif | |
381 | ||
382 | IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE | |
383 | stop_tracing (void) | |
384 | { | |
385 | /* GDBserver places breakpoint here. */ | |
386 | UNKNOWN_SIDE_EFFECTS(); | |
387 | } | |
388 | ||
389 | IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE | |
390 | flush_trace_buffer (void) | |
391 | { | |
392 | /* GDBserver places breakpoint here. */ | |
393 | UNKNOWN_SIDE_EFFECTS(); | |
394 | } | |
395 | ||
396 | #endif | |
397 | ||
398 | #ifndef IN_PROCESS_AGENT | |
219f2f23 PA |
399 | static int |
400 | tracepoint_handler (CORE_ADDR address) | |
401 | { | |
402 | trace_debug ("tracepoint_handler: tracepoint at 0x%s hit", | |
403 | paddress (address)); | |
404 | return 0; | |
405 | } | |
406 | ||
fa593d66 PA |
407 | /* Breakpoint at "stop_tracing" in the inferior lib. */ |
408 | struct breakpoint *stop_tracing_bkpt; | |
409 | static int stop_tracing_handler (CORE_ADDR); | |
410 | ||
411 | /* Breakpoint at "flush_trace_buffer" in the inferior lib. */ | |
412 | struct breakpoint *flush_trace_buffer_bkpt; | |
413 | static int flush_trace_buffer_handler (CORE_ADDR); | |
414 | ||
415 | static void download_tracepoints (void); | |
416 | static void download_trace_state_variables (void); | |
417 | static void upload_fast_traceframes (void); | |
418 | ||
0fb4aa4b PA |
419 | static int run_inferior_command (char *cmd); |
420 | ||
fa593d66 PA |
421 | static int |
422 | read_inferior_integer (CORE_ADDR symaddr, int *val) | |
423 | { | |
424 | return read_inferior_memory (symaddr, (unsigned char *) val, | |
425 | sizeof (*val)); | |
426 | } | |
427 | ||
428 | static int | |
429 | read_inferior_uinteger (CORE_ADDR symaddr, unsigned int *val) | |
430 | { | |
431 | return read_inferior_memory (symaddr, (unsigned char *) val, | |
432 | sizeof (*val)); | |
433 | } | |
434 | ||
435 | static int | |
436 | read_inferior_data_pointer (CORE_ADDR symaddr, CORE_ADDR *val) | |
437 | { | |
438 | void *pval = (void *) (uintptr_t) val; | |
439 | int ret; | |
440 | ||
441 | ret = read_inferior_memory (symaddr, (unsigned char *) &pval, sizeof (pval)); | |
442 | *val = (uintptr_t) pval; | |
443 | return ret; | |
444 | } | |
445 | ||
446 | static int | |
447 | write_inferior_data_pointer (CORE_ADDR symaddr, CORE_ADDR val) | |
448 | { | |
449 | void *pval = (void *) (uintptr_t) val; | |
450 | return write_inferior_memory (symaddr, | |
451 | (unsigned char *) &pval, sizeof (pval)); | |
452 | } | |
453 | ||
454 | static int | |
455 | write_inferior_integer (CORE_ADDR symaddr, int val) | |
456 | { | |
457 | return write_inferior_memory (symaddr, (unsigned char *) &val, sizeof (val)); | |
458 | } | |
459 | ||
460 | static int | |
461 | write_inferior_uinteger (CORE_ADDR symaddr, unsigned int val) | |
462 | { | |
463 | return write_inferior_memory (symaddr, (unsigned char *) &val, sizeof (val)); | |
464 | } | |
465 | ||
466 | #endif | |
467 | ||
219f2f23 PA |
468 | /* This enum must exactly match what is documented in |
469 | gdb/doc/agentexpr.texi, including all the numerical values. */ | |
470 | ||
471 | enum gdb_agent_op | |
472 | { | |
94d5e490 TT |
473 | #define DEFOP(NAME, SIZE, DATA_SIZE, CONSUMED, PRODUCED, VALUE) \ |
474 | gdb_agent_op_ ## NAME = VALUE, | |
475 | #include "ax.def" | |
476 | #undef DEFOP | |
219f2f23 PA |
477 | gdb_agent_op_last |
478 | }; | |
479 | ||
480 | static const char *gdb_agent_op_names [gdb_agent_op_last] = | |
481 | { | |
94d5e490 TT |
482 | "?undef?" |
483 | #define DEFOP(NAME, SIZE, DATA_SIZE, CONSUMED, PRODUCED, VALUE) , # NAME | |
484 | #include "ax.def" | |
485 | #undef DEFOP | |
219f2f23 PA |
486 | }; |
487 | ||
488 | struct agent_expr | |
489 | { | |
490 | int length; | |
491 | ||
492 | unsigned char *bytes; | |
493 | }; | |
494 | ||
495 | /* Base action. Concrete actions inherit this. */ | |
496 | ||
497 | struct tracepoint_action | |
498 | { | |
499 | char type; | |
500 | }; | |
501 | ||
502 | /* An 'M' (collect memory) action. */ | |
503 | struct collect_memory_action | |
504 | { | |
505 | struct tracepoint_action base; | |
506 | ||
507 | ULONGEST addr; | |
508 | ULONGEST len; | |
509 | int basereg; | |
510 | }; | |
511 | ||
512 | /* An 'R' (collect registers) action. */ | |
513 | ||
514 | struct collect_registers_action | |
515 | { | |
516 | struct tracepoint_action base; | |
517 | }; | |
518 | ||
519 | /* An 'X' (evaluate expression) action. */ | |
520 | ||
521 | struct eval_expr_action | |
522 | { | |
523 | struct tracepoint_action base; | |
524 | ||
525 | struct agent_expr *expr; | |
526 | }; | |
527 | ||
0fb4aa4b PA |
528 | /* An 'L' (collect static trace data) action. */ |
529 | struct collect_static_trace_data_action | |
530 | { | |
531 | struct tracepoint_action base; | |
532 | }; | |
533 | ||
219f2f23 PA |
534 | /* This structure describes a piece of the source-level definition of |
535 | the tracepoint. The contents are not interpreted by the target, | |
536 | but preserved verbatim for uploading upon reconnection. */ | |
537 | ||
538 | struct source_string | |
539 | { | |
540 | /* The type of string, such as "cond" for a conditional. */ | |
541 | char *type; | |
542 | ||
543 | /* The source-level string itself. For the sake of target | |
544 | debugging, we store it in plaintext, even though it is always | |
545 | transmitted in hex. */ | |
546 | char *str; | |
547 | ||
548 | /* Link to the next one in the list. We link them in the order | |
549 | received, in case some make up an ordered list of commands or | |
550 | some such. */ | |
551 | struct source_string *next; | |
552 | }; | |
553 | ||
fa593d66 PA |
554 | enum tracepoint_type |
555 | { | |
556 | /* Trap based tracepoint. */ | |
557 | trap_tracepoint, | |
558 | ||
559 | /* A fast tracepoint implemented with a jump instead of a trap. */ | |
560 | fast_tracepoint, | |
0fb4aa4b PA |
561 | |
562 | /* A static tracepoint, implemented by a program call into a tracing | |
563 | library. */ | |
564 | static_tracepoint | |
fa593d66 PA |
565 | }; |
566 | ||
219f2f23 PA |
567 | struct tracepoint_hit_ctx; |
568 | ||
6a271cae PA |
569 | typedef enum eval_result_type (*condfn) (struct tracepoint_hit_ctx *, |
570 | ULONGEST *); | |
571 | ||
219f2f23 PA |
572 | /* The definition of a tracepoint. */ |
573 | ||
574 | /* Tracepoints may have multiple locations, each at a different | |
575 | address. This can occur with optimizations, template | |
576 | instantiation, etc. Since the locations may be in different | |
577 | scopes, the conditions and actions may be different for each | |
578 | location. Our target version of tracepoints is more like GDB's | |
579 | notion of "breakpoint locations", but we have almost nothing that | |
580 | is not per-location, so we bother having two kinds of objects. The | |
581 | key consequence is that numbers are not unique, and that it takes | |
582 | both number and address to identify a tracepoint uniquely. */ | |
583 | ||
584 | struct tracepoint | |
585 | { | |
586 | /* The number of the tracepoint, as specified by GDB. Several | |
587 | tracepoint objects here may share a number. */ | |
588 | int number; | |
589 | ||
590 | /* Address at which the tracepoint is supposed to trigger. Several | |
591 | tracepoints may share an address. */ | |
592 | CORE_ADDR address; | |
593 | ||
fa593d66 PA |
594 | /* Tracepoint type. */ |
595 | enum tracepoint_type type; | |
596 | ||
219f2f23 PA |
597 | /* True if the tracepoint is currently enabled. */ |
598 | int enabled; | |
599 | ||
600 | /* The number of single steps that will be performed after each | |
601 | tracepoint hit. */ | |
602 | long step_count; | |
603 | ||
604 | /* The number of times the tracepoint may be hit before it will | |
605 | terminate the entire tracing run. */ | |
606 | long pass_count; | |
607 | ||
608 | /* Pointer to the agent expression that is the tracepoint's | |
609 | conditional, or NULL if the tracepoint is unconditional. */ | |
610 | struct agent_expr *cond; | |
611 | ||
612 | /* The list of actions to take when the tracepoint triggers. */ | |
613 | int numactions; | |
614 | struct tracepoint_action **actions; | |
219f2f23 PA |
615 | |
616 | /* Count of the times we've hit this tracepoint during the run. | |
617 | Note that while-stepping steps are not counted as "hits". */ | |
618 | long hit_count; | |
619 | ||
6a271cae PA |
620 | CORE_ADDR compiled_cond; |
621 | ||
fa593d66 PA |
622 | /* Link to the next tracepoint in the list. */ |
623 | struct tracepoint *next; | |
624 | ||
625 | #ifndef IN_PROCESS_AGENT | |
626 | /* The list of actions to take when the tracepoint triggers, in | |
627 | string/packet form. */ | |
628 | char **actions_str; | |
629 | ||
219f2f23 PA |
630 | /* The collection of strings that describe the tracepoint as it was |
631 | entered into GDB. These are not used by the target, but are | |
632 | reported back to GDB upon reconnection. */ | |
633 | struct source_string *source_strings; | |
634 | ||
fa593d66 PA |
635 | /* The number of bytes displaced by fast tracepoints. It may subsume |
636 | multiple instructions, for multi-byte fast tracepoints. This | |
637 | field is only valid for fast tracepoints. */ | |
638 | int orig_size; | |
639 | ||
640 | /* Only for fast tracepoints. */ | |
641 | CORE_ADDR obj_addr_on_target; | |
642 | ||
643 | /* Address range where the original instruction under a fast | |
644 | tracepoint was relocated to. (_end is actually one byte past | |
645 | the end). */ | |
646 | CORE_ADDR adjusted_insn_addr; | |
647 | CORE_ADDR adjusted_insn_addr_end; | |
648 | ||
649 | /* The address range of the piece of the jump pad buffer that was | |
650 | assigned to this fast tracepoint. (_end is actually one byte | |
651 | past the end).*/ | |
652 | CORE_ADDR jump_pad; | |
653 | CORE_ADDR jump_pad_end; | |
654 | ||
655 | /* The list of actions to take while in a stepping loop. These | |
656 | fields are only valid for patch-based tracepoints. */ | |
657 | int num_step_actions; | |
658 | struct tracepoint_action **step_actions; | |
659 | /* Same, but in string/packet form. */ | |
660 | char **step_actions_str; | |
661 | ||
662 | /* Handle returned by the breakpoint or tracepoint module when we | |
0fb4aa4b PA |
663 | inserted the trap or jump, or hooked into a static tracepoint. |
664 | NULL if we haven't inserted it yet. */ | |
219f2f23 | 665 | void *handle; |
fa593d66 | 666 | #endif |
219f2f23 | 667 | |
219f2f23 PA |
668 | }; |
669 | ||
fa593d66 PA |
670 | #ifndef IN_PROCESS_AGENT |
671 | ||
219f2f23 PA |
672 | /* Given `while-stepping', a thread may be collecting data for more |
673 | than one tracepoint simultaneously. On the other hand, the same | |
674 | tracepoint with a while-stepping action may be hit by more than one | |
675 | thread simultaneously (but not quite, each thread could be handling | |
676 | a different step). Each thread holds a list of these objects, | |
677 | representing the current step of each while-stepping action being | |
678 | collected. */ | |
679 | ||
680 | struct wstep_state | |
681 | { | |
682 | struct wstep_state *next; | |
683 | ||
684 | /* The tracepoint number. */ | |
685 | int tp_number; | |
686 | /* The tracepoint's address. */ | |
687 | CORE_ADDR tp_address; | |
688 | ||
689 | /* The number of the current step in this 'while-stepping' | |
690 | action. */ | |
691 | long current_step; | |
692 | }; | |
693 | ||
fa593d66 PA |
694 | #endif |
695 | ||
696 | /* The linked list of all tracepoints. Marked explicitly as used as | |
697 | the in-process library doesn't use it for the fast tracepoints | |
698 | support. */ | |
699 | IP_AGENT_EXPORT struct tracepoint *tracepoints ATTR_USED; | |
219f2f23 | 700 | |
fa593d66 | 701 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
702 | |
703 | /* Pointer to the last tracepoint in the list, new tracepoints are | |
704 | linked in at the end. */ | |
705 | ||
706 | static struct tracepoint *last_tracepoint; | |
fa593d66 | 707 | #endif |
219f2f23 PA |
708 | |
709 | /* The first tracepoint to exceed its pass count. */ | |
710 | ||
fa593d66 | 711 | IP_AGENT_EXPORT struct tracepoint *stopping_tracepoint; |
219f2f23 PA |
712 | |
713 | /* True if the trace buffer is full or otherwise no longer usable. */ | |
714 | ||
fa593d66 | 715 | IP_AGENT_EXPORT int trace_buffer_is_full; |
219f2f23 PA |
716 | |
717 | /* Enumeration of the different kinds of things that can happen during | |
718 | agent expression evaluation. */ | |
719 | ||
720 | enum eval_result_type | |
721 | { | |
722 | expr_eval_no_error, | |
723 | expr_eval_empty_expression, | |
724 | expr_eval_empty_stack, | |
725 | expr_eval_stack_overflow, | |
726 | expr_eval_stack_underflow, | |
727 | expr_eval_unhandled_opcode, | |
728 | expr_eval_unrecognized_opcode, | |
729 | expr_eval_divide_by_zero, | |
730 | expr_eval_invalid_goto | |
731 | }; | |
732 | ||
733 | static enum eval_result_type expr_eval_result = expr_eval_no_error; | |
734 | ||
fa593d66 PA |
735 | #ifndef IN_PROCESS_AGENT |
736 | ||
219f2f23 PA |
737 | static const char *eval_result_names[] = |
738 | { | |
739 | "terror:in the attic", /* this should never be reported */ | |
740 | "terror:empty expression", | |
741 | "terror:empty stack", | |
742 | "terror:stack overflow", | |
743 | "terror:stack underflow", | |
744 | "terror:unhandled opcode", | |
745 | "terror:unrecognized opcode", | |
746 | "terror:divide by zero" | |
747 | }; | |
748 | ||
fa593d66 PA |
749 | #endif |
750 | ||
219f2f23 PA |
751 | /* The tracepoint in which the error occurred. */ |
752 | ||
753 | static struct tracepoint *error_tracepoint; | |
754 | ||
755 | struct trace_state_variable | |
756 | { | |
757 | /* This is the name of the variable as used in GDB. The target | |
758 | doesn't use the name, but needs to have it for saving and | |
759 | reconnection purposes. */ | |
760 | char *name; | |
761 | ||
762 | /* This number identifies the variable uniquely. Numbers may be | |
763 | assigned either by the target (in the case of builtin variables), | |
764 | or by GDB, and are presumed unique during the course of a trace | |
765 | experiment. */ | |
766 | int number; | |
767 | ||
768 | /* The variable's initial value, a 64-bit signed integer always. */ | |
769 | LONGEST initial_value; | |
770 | ||
771 | /* The variable's value, a 64-bit signed integer always. */ | |
772 | LONGEST value; | |
773 | ||
774 | /* Pointer to a getter function, used to supply computed values. */ | |
775 | LONGEST (*getter) (void); | |
776 | ||
777 | /* Link to the next variable. */ | |
778 | struct trace_state_variable *next; | |
779 | }; | |
780 | ||
781 | /* Linked list of all trace state variables. */ | |
782 | ||
fa593d66 PA |
783 | #ifdef IN_PROCESS_AGENT |
784 | struct trace_state_variable *alloced_trace_state_variables; | |
785 | #endif | |
786 | ||
787 | IP_AGENT_EXPORT struct trace_state_variable *trace_state_variables; | |
219f2f23 PA |
788 | |
789 | /* The results of tracing go into a fixed-size space known as the | |
790 | "trace buffer". Because usage follows a limited number of | |
791 | patterns, we manage it ourselves rather than with malloc. Basic | |
792 | rules are that we create only one trace frame at a time, each is | |
793 | variable in size, they are never moved once created, and we only | |
794 | discard if we are doing a circular buffer, and then only the oldest | |
795 | ones. Each trace frame includes its own size, so we don't need to | |
796 | link them together, and the trace frame number is relative to the | |
797 | first one, so we don't need to record numbers. A trace frame also | |
798 | records the number of the tracepoint that created it. The data | |
799 | itself is a series of blocks, each introduced by a single character | |
800 | and with a defined format. Each type of block has enough | |
801 | type/length info to allow scanners to jump quickly from one block | |
802 | to the next without reading each byte in the block. */ | |
803 | ||
804 | /* Trace buffer management would be simple - advance a free pointer | |
805 | from beginning to end, then stop - were it not for the circular | |
806 | buffer option, which is a useful way to prevent a trace run from | |
807 | stopping prematurely because the buffer filled up. In the circular | |
808 | case, the location of the first trace frame (trace_buffer_start) | |
809 | moves as old trace frames are discarded. Also, since we grow trace | |
810 | frames incrementally as actions are performed, we wrap around to | |
811 | the beginning of the trace buffer. This is per-block, so each | |
812 | block within a trace frame remains contiguous. Things get messy | |
813 | when the wrapped-around trace frame is the one being discarded; the | |
814 | free space ends up in two parts at opposite ends of the buffer. */ | |
815 | ||
816 | #ifndef ATTR_PACKED | |
817 | # if defined(__GNUC__) | |
818 | # define ATTR_PACKED __attribute__ ((packed)) | |
819 | # else | |
820 | # define ATTR_PACKED /* nothing */ | |
821 | # endif | |
822 | #endif | |
823 | ||
824 | /* The data collected at a tracepoint hit. This object should be as | |
825 | small as possible, since there may be a great many of them. We do | |
826 | not need to keep a frame number, because they are all sequential | |
827 | and there are no deletions; so the Nth frame in the buffer is | |
828 | always frame number N. */ | |
829 | ||
830 | struct traceframe | |
831 | { | |
832 | /* Number of the tracepoint that collected this traceframe. A value | |
833 | of 0 indicates the current end of the trace buffer. We make this | |
834 | a 16-bit field because it's never going to happen that GDB's | |
835 | numbering of tracepoints reaches 32,000. */ | |
836 | int tpnum : 16; | |
837 | ||
838 | /* The size of the data in this trace frame. We limit this to 32 | |
839 | bits, even on a 64-bit target, because it's just implausible that | |
840 | one is validly going to collect 4 gigabytes of data at a single | |
841 | tracepoint hit. */ | |
842 | unsigned int data_size : 32; | |
843 | ||
844 | /* The base of the trace data, which is contiguous from this point. */ | |
845 | unsigned char data[0]; | |
846 | ||
fa593d66 | 847 | } ATTR_PACKED; |
219f2f23 PA |
848 | |
849 | /* The traceframe to be used as the source of data to send back to | |
850 | GDB. A value of -1 means to get data from the live program. */ | |
851 | ||
852 | int current_traceframe = -1; | |
853 | ||
854 | /* This flag is true if the trace buffer is circular, meaning that | |
855 | when it fills, the oldest trace frames are discarded in order to | |
856 | make room. */ | |
857 | ||
fa593d66 | 858 | #ifndef IN_PROCESS_AGENT |
219f2f23 | 859 | static int circular_trace_buffer; |
fa593d66 | 860 | #endif |
219f2f23 PA |
861 | |
862 | /* Pointer to the block of memory that traceframes all go into. */ | |
863 | ||
864 | static unsigned char *trace_buffer_lo; | |
865 | ||
866 | /* Pointer to the end of the trace buffer, more precisely to the byte | |
867 | after the end of the buffer. */ | |
868 | ||
869 | static unsigned char *trace_buffer_hi; | |
870 | ||
fa593d66 PA |
871 | /* Control structure holding the read/write/etc. pointers into the |
872 | trace buffer. We need more than one of these to implement a | |
873 | transaction-like mechanism to garantees that both GDBserver and the | |
874 | in-process agent can try to change the trace buffer | |
875 | simultaneously. */ | |
876 | ||
877 | struct trace_buffer_control | |
878 | { | |
879 | /* Pointer to the first trace frame in the buffer. In the | |
880 | non-circular case, this is equal to trace_buffer_lo, otherwise it | |
881 | moves around in the buffer. */ | |
882 | unsigned char *start; | |
883 | ||
884 | /* Pointer to the free part of the trace buffer. Note that we clear | |
885 | several bytes at and after this pointer, so that traceframe | |
886 | scans/searches terminate properly. */ | |
887 | unsigned char *free; | |
888 | ||
889 | /* Pointer to the byte after the end of the free part. Note that | |
890 | this may be smaller than trace_buffer_free in the circular case, | |
891 | and means that the free part is in two pieces. Initially it is | |
892 | equal to trace_buffer_hi, then is generally equivalent to | |
893 | trace_buffer_start. */ | |
894 | unsigned char *end_free; | |
895 | ||
896 | /* Pointer to the wraparound. If not equal to trace_buffer_hi, then | |
897 | this is the point at which the trace data breaks, and resumes at | |
898 | trace_buffer_lo. */ | |
899 | unsigned char *wrap; | |
900 | }; | |
901 | ||
902 | /* Same as above, to be used by GDBserver when updating the in-process | |
903 | agent. */ | |
904 | struct ipa_trace_buffer_control | |
905 | { | |
906 | uintptr_t start; | |
907 | uintptr_t free; | |
908 | uintptr_t end_free; | |
909 | uintptr_t wrap; | |
910 | }; | |
911 | ||
912 | ||
913 | /* We have possibly both GDBserver and an inferior thread accessing | |
914 | the same IPA trace buffer memory. The IPA is the producer (tries | |
915 | to put new frames in the buffer), while GDBserver occasionally | |
916 | consumes them, that is, flushes the IPA's buffer into its own | |
917 | buffer. Both sides need to update the trace buffer control | |
918 | pointers (current head, tail, etc.). We can't use a global lock to | |
919 | synchronize the accesses, as otherwise we could deadlock GDBserver | |
920 | (if the thread holding the lock stops for a signal, say). So | |
921 | instead of that, we use a transaction scheme where GDBserver writes | |
922 | always prevail over the IPAs writes, and, we have the IPA detect | |
923 | the commit failure/overwrite, and retry the whole attempt. This is | |
924 | mainly implemented by having a global token object that represents | |
925 | who wrote last to the buffer control structure. We need to freeze | |
926 | any inferior writing to the buffer while GDBserver touches memory, | |
927 | so that the inferior can correctly detect that GDBserver had been | |
928 | there, otherwise, it could mistakingly think its commit was | |
929 | successful; that's implemented by simply having GDBserver set a | |
930 | breakpoint the inferior hits if it is the critical region. | |
931 | ||
932 | There are three cycling trace buffer control structure copies | |
933 | (buffer head, tail, etc.), with the token object including an index | |
934 | indicating which is current live copy. The IPA tentatively builds | |
935 | an updated copy in a non-current control structure, while GDBserver | |
936 | always clobbers the current version directly. The IPA then tries | |
937 | to atomically "commit" its version; if GDBserver clobbered the | |
938 | structure meanwhile, that will fail, and the IPA restarts the | |
939 | allocation process. | |
940 | ||
941 | Listing the step in further detail, we have: | |
942 | ||
943 | In-process agent (producer): | |
944 | ||
945 | - passes by `about_to_request_buffer_space' breakpoint/lock | |
946 | ||
947 | - reads current token, extracts current trace buffer control index, | |
948 | and starts tentatively updating the rightmost one (0->1, 1->2, | |
949 | 2->0). Note that only one inferior thread is executing this code | |
950 | at any given time, due to an outer lock in the jump pads. | |
219f2f23 | 951 | |
fa593d66 | 952 | - updates counters, and tries to commit the token. |
219f2f23 | 953 | |
fa593d66 PA |
954 | - passes by second `about_to_request_buffer_space' breakpoint/lock, |
955 | leaving the sync region. | |
219f2f23 | 956 | |
fa593d66 | 957 | - checks if the update was effective. |
219f2f23 | 958 | |
fa593d66 PA |
959 | - if trace buffer was found full, hits flush_trace_buffer |
960 | breakpoint, and restarts later afterwards. | |
219f2f23 | 961 | |
fa593d66 | 962 | GDBserver (consumer): |
219f2f23 | 963 | |
fa593d66 PA |
964 | - sets `about_to_request_buffer_space' breakpoint/lock. |
965 | ||
966 | - updates the token unconditionally, using the current buffer | |
967 | control index, since it knows that the IP agent always writes to | |
968 | the rightmost, and due to the breakpoint, at most one IP thread | |
969 | can try to update the trace buffer concurrently to GDBserver, so | |
970 | there will be no danger of trace buffer control index wrap making | |
971 | the IPA write to the same index as GDBserver. | |
972 | ||
973 | - flushes the IP agent's trace buffer completely, and updates the | |
974 | current trace buffer control structure. GDBserver *always* wins. | |
975 | ||
976 | - removes the `about_to_request_buffer_space' breakpoint. | |
977 | ||
978 | The token is stored in the `trace_buffer_ctrl_curr' variable. | |
979 | Internally, it's bits are defined as: | |
980 | ||
981 | |-------------+-----+-------------+--------+-------------+--------------| | |
982 | | Bit offsets | 31 | 30 - 20 | 19 | 18-8 | 7-0 | | |
983 | |-------------+-----+-------------+--------+-------------+--------------| | |
984 | | What | GSB | PC (11-bit) | unused | CC (11-bit) | TBCI (8-bit) | | |
985 | |-------------+-----+-------------+--------+-------------+--------------| | |
986 | ||
987 | GSB - GDBserver Stamp Bit | |
988 | PC - Previous Counter | |
989 | CC - Current Counter | |
990 | TBCI - Trace Buffer Control Index | |
991 | ||
992 | ||
993 | An IPA update of `trace_buffer_ctrl_curr' does: | |
994 | ||
995 | - read CC from the current token, save as PC. | |
996 | - updates pointers | |
997 | - atomically tries to write PC+1,CC | |
998 | ||
999 | A GDBserver update of `trace_buffer_ctrl_curr' does: | |
1000 | ||
1001 | - reads PC and CC from the current token. | |
1002 | - updates pointers | |
1003 | - writes GSB,PC,CC | |
1004 | */ | |
1005 | ||
1006 | /* These are the bits of `trace_buffer_ctrl_curr' that are reserved | |
1007 | for the counters described below. The cleared bits are used to | |
1008 | hold the index of the items of the `trace_buffer_ctrl' array that | |
1009 | is "current". */ | |
1010 | #define GDBSERVER_FLUSH_COUNT_MASK 0xfffffff0 | |
1011 | ||
1012 | /* `trace_buffer_ctrl_curr' contains two counters. The `previous' | |
1013 | counter, and the `current' counter. */ | |
1014 | ||
1015 | #define GDBSERVER_FLUSH_COUNT_MASK_PREV 0x7ff00000 | |
1016 | #define GDBSERVER_FLUSH_COUNT_MASK_CURR 0x0007ff00 | |
1017 | ||
1018 | /* When GDBserver update the IP agent's `trace_buffer_ctrl_curr', it | |
1019 | always stamps this bit as set. */ | |
1020 | #define GDBSERVER_UPDATED_FLUSH_COUNT_BIT 0x80000000 | |
1021 | ||
1022 | #ifdef IN_PROCESS_AGENT | |
1023 | IP_AGENT_EXPORT struct trace_buffer_control trace_buffer_ctrl[3]; | |
1024 | IP_AGENT_EXPORT unsigned int trace_buffer_ctrl_curr; | |
1025 | ||
1026 | # define TRACE_BUFFER_CTRL_CURR \ | |
1027 | (trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK) | |
1028 | ||
1029 | #else | |
1030 | ||
1031 | /* The GDBserver side agent only needs one instance of this object, as | |
1032 | it doesn't need to sync with itself. Define it as array anyway so | |
1033 | that the rest of the code base doesn't need to care for the | |
1034 | difference. */ | |
1035 | struct trace_buffer_control trace_buffer_ctrl[1]; | |
1036 | # define TRACE_BUFFER_CTRL_CURR 0 | |
1037 | #endif | |
1038 | ||
1039 | /* These are convenience macros used to access the current trace | |
1040 | buffer control in effect. */ | |
1041 | #define trace_buffer_start (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].start) | |
1042 | #define trace_buffer_free (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].free) | |
1043 | #define trace_buffer_end_free \ | |
1044 | (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].end_free) | |
1045 | #define trace_buffer_wrap (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].wrap) | |
219f2f23 | 1046 | |
219f2f23 PA |
1047 | |
1048 | /* Macro that returns a pointer to the first traceframe in the buffer. */ | |
1049 | ||
1050 | #define FIRST_TRACEFRAME() ((struct traceframe *) trace_buffer_start) | |
1051 | ||
1052 | /* Macro that returns a pointer to the next traceframe in the buffer. | |
1053 | If the computed location is beyond the wraparound point, subtract | |
1054 | the offset of the wraparound. */ | |
1055 | ||
1056 | #define NEXT_TRACEFRAME_1(TF) \ | |
1057 | (((unsigned char *) (TF)) + sizeof (struct traceframe) + (TF)->data_size) | |
1058 | ||
1059 | #define NEXT_TRACEFRAME(TF) \ | |
1060 | ((struct traceframe *) (NEXT_TRACEFRAME_1 (TF) \ | |
1061 | - ((NEXT_TRACEFRAME_1 (TF) >= trace_buffer_wrap) \ | |
1062 | ? (trace_buffer_wrap - trace_buffer_lo) \ | |
1063 | : 0))) | |
1064 | ||
1065 | /* The difference between these counters represents the total number | |
fa593d66 PA |
1066 | of complete traceframes present in the trace buffer. The IP agent |
1067 | writes to the write count, GDBserver writes to read count. */ | |
219f2f23 | 1068 | |
fa593d66 PA |
1069 | IP_AGENT_EXPORT unsigned int traceframe_write_count; |
1070 | IP_AGENT_EXPORT unsigned int traceframe_read_count; | |
219f2f23 PA |
1071 | |
1072 | /* Convenience macro. */ | |
1073 | ||
1074 | #define traceframe_count \ | |
1075 | ((unsigned int) (traceframe_write_count - traceframe_read_count)) | |
1076 | ||
1077 | /* The count of all traceframes created in the current run, including | |
1078 | ones that were discarded to make room. */ | |
1079 | ||
fa593d66 PA |
1080 | IP_AGENT_EXPORT int traceframes_created; |
1081 | ||
1082 | #ifndef IN_PROCESS_AGENT | |
219f2f23 PA |
1083 | |
1084 | /* Read-only regions are address ranges whose contents don't change, | |
1085 | and so can be read from target memory even while looking at a trace | |
1086 | frame. Without these, disassembly for instance will likely fail, | |
1087 | because the program code is not usually collected into a trace | |
1088 | frame. This data structure does not need to be very complicated or | |
1089 | particularly efficient, it's only going to be used occasionally, | |
1090 | and only by some commands. */ | |
1091 | ||
1092 | struct readonly_region | |
1093 | { | |
1094 | /* The bounds of the region. */ | |
1095 | CORE_ADDR start, end; | |
1096 | ||
1097 | /* Link to the next one. */ | |
1098 | struct readonly_region *next; | |
1099 | }; | |
1100 | ||
1101 | /* Linked list of readonly regions. This list stays in effect from | |
1102 | one tstart to the next. */ | |
1103 | ||
1104 | static struct readonly_region *readonly_regions; | |
1105 | ||
fa593d66 PA |
1106 | #endif |
1107 | ||
219f2f23 PA |
1108 | /* The global that controls tracing overall. */ |
1109 | ||
fa593d66 PA |
1110 | IP_AGENT_EXPORT int tracing; |
1111 | ||
1112 | #ifndef IN_PROCESS_AGENT | |
8336d594 PA |
1113 | |
1114 | /* Controls whether tracing should continue after GDB disconnects. */ | |
1115 | ||
1116 | int disconnected_tracing; | |
219f2f23 PA |
1117 | |
1118 | /* The reason for the last tracing run to have stopped. We initialize | |
1119 | to a distinct string so that GDB can distinguish between "stopped | |
1120 | after running" and "stopped because never run" cases. */ | |
1121 | ||
1122 | static const char *tracing_stop_reason = "tnotrun"; | |
1123 | ||
1124 | static int tracing_stop_tpnum; | |
1125 | ||
fa593d66 PA |
1126 | #endif |
1127 | ||
219f2f23 PA |
1128 | /* Functions local to this file. */ |
1129 | ||
1130 | /* Base "class" for tracepoint type specific data to be passed down to | |
fa593d66 | 1131 | collect_data_at_tracepoint. */ |
219f2f23 PA |
1132 | struct tracepoint_hit_ctx |
1133 | { | |
fa593d66 | 1134 | enum tracepoint_type type; |
219f2f23 PA |
1135 | }; |
1136 | ||
fa593d66 PA |
1137 | #ifdef IN_PROCESS_AGENT |
1138 | ||
1139 | /* Fast/jump tracepoint specific data to be passed down to | |
219f2f23 | 1140 | collect_data_at_tracepoint. */ |
fa593d66 PA |
1141 | struct fast_tracepoint_ctx |
1142 | { | |
1143 | struct tracepoint_hit_ctx base; | |
1144 | ||
1145 | struct regcache regcache; | |
1146 | int regcache_initted; | |
1147 | unsigned char *regspace; | |
1148 | ||
1149 | unsigned char *regs; | |
1150 | struct tracepoint *tpoint; | |
1151 | }; | |
219f2f23 | 1152 | |
0fb4aa4b PA |
1153 | /* Static tracepoint specific data to be passed down to |
1154 | collect_data_at_tracepoint. */ | |
1155 | struct static_tracepoint_ctx | |
1156 | { | |
1157 | struct tracepoint_hit_ctx base; | |
1158 | ||
1159 | /* The regcache corresponding to the registers state at the time of | |
1160 | the tracepoint hit. Initialized lazily, from REGS. */ | |
1161 | struct regcache regcache; | |
1162 | int regcache_initted; | |
1163 | ||
1164 | /* The buffer space REGCACHE above uses. We use a separate buffer | |
1165 | instead of letting the regcache malloc for both signal safety and | |
1166 | performance reasons; this is allocated on the stack instead. */ | |
1167 | unsigned char *regspace; | |
1168 | ||
1169 | /* The register buffer as passed on by lttng/ust. */ | |
1170 | struct registers *regs; | |
1171 | ||
1172 | /* The "printf" formatter and the args the user passed to the marker | |
1173 | call. We use this to be able to collect "static trace data" | |
1174 | ($_sdata). */ | |
1175 | const char *fmt; | |
1176 | va_list *args; | |
1177 | ||
1178 | /* The GDB tracepoint matching the probed marker that was "hit". */ | |
1179 | struct tracepoint *tpoint; | |
1180 | }; | |
1181 | ||
fa593d66 PA |
1182 | #else |
1183 | ||
1184 | /* Static tracepoint specific data to be passed down to | |
1185 | collect_data_at_tracepoint. */ | |
219f2f23 PA |
1186 | struct trap_tracepoint_ctx |
1187 | { | |
1188 | struct tracepoint_hit_ctx base; | |
1189 | ||
1190 | struct regcache *regcache; | |
1191 | }; | |
1192 | ||
fa593d66 PA |
1193 | #endif |
1194 | ||
1195 | #ifndef IN_PROCESS_AGENT | |
219f2f23 PA |
1196 | static struct agent_expr *parse_agent_expr (char **actparm); |
1197 | static char *unparse_agent_expr (struct agent_expr *aexpr); | |
fa593d66 | 1198 | #endif |
219f2f23 PA |
1199 | static enum eval_result_type eval_agent_expr (struct tracepoint_hit_ctx *ctx, |
1200 | struct traceframe *tframe, | |
1201 | struct agent_expr *aexpr, | |
1202 | ULONGEST *rslt); | |
1203 | ||
1204 | static int agent_mem_read (struct traceframe *tframe, | |
1205 | unsigned char *to, CORE_ADDR from, ULONGEST len); | |
1206 | static int agent_tsv_read (struct traceframe *tframe, int n); | |
1207 | ||
fa593d66 | 1208 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1209 | static CORE_ADDR traceframe_get_pc (struct traceframe *tframe); |
1210 | static int traceframe_read_tsv (int num, LONGEST *val); | |
fa593d66 | 1211 | #endif |
219f2f23 PA |
1212 | |
1213 | static int condition_true_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
1214 | struct tracepoint *tpoint); | |
1215 | ||
fa593d66 | 1216 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1217 | static void clear_readonly_regions (void); |
1218 | static void clear_installed_tracepoints (void); | |
fa593d66 | 1219 | #endif |
219f2f23 PA |
1220 | |
1221 | static void collect_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
1222 | CORE_ADDR stop_pc, | |
1223 | struct tracepoint *tpoint); | |
fa593d66 | 1224 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1225 | static void collect_data_at_step (struct tracepoint_hit_ctx *ctx, |
1226 | CORE_ADDR stop_pc, | |
1227 | struct tracepoint *tpoint, int current_step); | |
6a271cae PA |
1228 | static void compile_tracepoint_condition (struct tracepoint *tpoint, |
1229 | CORE_ADDR *jump_entry); | |
fa593d66 | 1230 | #endif |
219f2f23 PA |
1231 | static void do_action_at_tracepoint (struct tracepoint_hit_ctx *ctx, |
1232 | CORE_ADDR stop_pc, | |
1233 | struct tracepoint *tpoint, | |
1234 | struct traceframe *tframe, | |
1235 | struct tracepoint_action *taction); | |
1236 | ||
fa593d66 PA |
1237 | #ifndef IN_PROCESS_AGENT |
1238 | static struct tracepoint *fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR); | |
1239 | #endif | |
1240 | ||
1241 | #if defined(__GNUC__) | |
1242 | # define memory_barrier() asm volatile ("" : : : "memory") | |
1243 | #else | |
1244 | # define memory_barrier() do {} while (0) | |
1245 | #endif | |
1246 | ||
1247 | /* We only build the IPA if this builtin is supported, and there are | |
1248 | no uses of this in GDBserver itself, so we're safe in defining this | |
1249 | unconditionally. */ | |
1250 | #define cmpxchg(mem, oldval, newval) \ | |
1251 | __sync_val_compare_and_swap (mem, oldval, newval) | |
1252 | ||
0fb4aa4b PA |
1253 | /* The size in bytes of the buffer used to talk to the IPA helper |
1254 | thread. */ | |
1255 | #define CMD_BUF_SIZE 1024 | |
1256 | ||
219f2f23 PA |
1257 | /* Record that an error occurred during expression evaluation. */ |
1258 | ||
1259 | static void | |
1260 | record_tracepoint_error (struct tracepoint *tpoint, const char *which, | |
1261 | enum eval_result_type rtype) | |
1262 | { | |
1263 | trace_debug ("Tracepoint %d at %s %s eval reports error %d", | |
1264 | tpoint->number, paddress (tpoint->address), which, rtype); | |
1265 | ||
fa593d66 PA |
1266 | #ifdef IN_PROCESS_AGENT |
1267 | /* Only record the first error we get. */ | |
1268 | if (cmpxchg (&expr_eval_result, | |
1269 | expr_eval_no_error, | |
1270 | rtype) != expr_eval_no_error) | |
1271 | return; | |
1272 | #else | |
1273 | if (expr_eval_result != expr_eval_no_error) | |
1274 | return; | |
1275 | #endif | |
1276 | ||
219f2f23 PA |
1277 | error_tracepoint = tpoint; |
1278 | } | |
1279 | ||
1280 | /* Trace buffer management. */ | |
1281 | ||
1282 | static void | |
1283 | clear_trace_buffer (void) | |
1284 | { | |
1285 | trace_buffer_start = trace_buffer_lo; | |
1286 | trace_buffer_free = trace_buffer_lo; | |
1287 | trace_buffer_end_free = trace_buffer_hi; | |
1288 | trace_buffer_wrap = trace_buffer_hi; | |
1289 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1290 | ((struct traceframe *) trace_buffer_free)->tpnum = 0; | |
1291 | ((struct traceframe *) trace_buffer_free)->data_size = 0; | |
1292 | traceframe_read_count = traceframe_write_count = 0; | |
1293 | traceframes_created = 0; | |
1294 | } | |
1295 | ||
fa593d66 PA |
1296 | #ifndef IN_PROCESS_AGENT |
1297 | ||
1298 | static void | |
1299 | clear_inferior_trace_buffer (void) | |
1300 | { | |
1301 | CORE_ADDR ipa_trace_buffer_lo; | |
1302 | CORE_ADDR ipa_trace_buffer_hi; | |
1303 | struct traceframe ipa_traceframe = { 0 }; | |
1304 | struct ipa_trace_buffer_control ipa_trace_buffer_ctrl; | |
1305 | ||
1306 | read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_lo, | |
1307 | &ipa_trace_buffer_lo); | |
1308 | read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_hi, | |
1309 | &ipa_trace_buffer_hi); | |
1310 | ||
1311 | ipa_trace_buffer_ctrl.start = ipa_trace_buffer_lo; | |
1312 | ipa_trace_buffer_ctrl.free = ipa_trace_buffer_lo; | |
1313 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_hi; | |
1314 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
1315 | ||
1316 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1317 | write_inferior_memory (ipa_sym_addrs.addr_trace_buffer_ctrl, | |
1318 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
1319 | sizeof (ipa_trace_buffer_ctrl)); | |
1320 | ||
1321 | write_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, 0); | |
1322 | ||
1323 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1324 | write_inferior_memory (ipa_trace_buffer_lo, | |
1325 | (unsigned char *) &ipa_traceframe, | |
1326 | sizeof (ipa_traceframe)); | |
1327 | ||
1328 | write_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, 0); | |
1329 | write_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, 0); | |
1330 | write_inferior_integer (ipa_sym_addrs.addr_traceframes_created, 0); | |
1331 | } | |
1332 | ||
1333 | #endif | |
1334 | ||
219f2f23 PA |
1335 | static void |
1336 | init_trace_buffer (unsigned char *buf, int bufsize) | |
1337 | { | |
1338 | trace_buffer_lo = buf; | |
1339 | trace_buffer_hi = trace_buffer_lo + bufsize; | |
1340 | ||
1341 | clear_trace_buffer (); | |
1342 | } | |
1343 | ||
fa593d66 PA |
1344 | #ifdef IN_PROCESS_AGENT |
1345 | ||
1346 | IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE | |
1347 | about_to_request_buffer_space (void) | |
1348 | { | |
1349 | /* GDBserver places breakpoint here while it goes about to flush | |
1350 | data at random times. */ | |
1351 | UNKNOWN_SIDE_EFFECTS(); | |
1352 | } | |
1353 | ||
1354 | #endif | |
1355 | ||
219f2f23 PA |
1356 | /* Carve out a piece of the trace buffer, returning NULL in case of |
1357 | failure. */ | |
1358 | ||
1359 | static void * | |
1360 | trace_buffer_alloc (size_t amt) | |
1361 | { | |
1362 | unsigned char *rslt; | |
fa593d66 PA |
1363 | struct trace_buffer_control *tbctrl; |
1364 | unsigned int curr; | |
1365 | #ifdef IN_PROCESS_AGENT | |
1366 | unsigned int prev, prev_filtered; | |
1367 | unsigned int commit_count; | |
1368 | unsigned int commit; | |
1369 | unsigned int readout; | |
1370 | #else | |
219f2f23 PA |
1371 | struct traceframe *oldest; |
1372 | unsigned char *new_start; | |
fa593d66 | 1373 | #endif |
219f2f23 PA |
1374 | |
1375 | trace_debug ("Want to allocate %ld+%ld bytes in trace buffer", | |
1376 | (long) amt, (long) sizeof (struct traceframe)); | |
1377 | ||
1378 | /* Account for the EOB marker. */ | |
1379 | amt += sizeof (struct traceframe); | |
1380 | ||
fa593d66 PA |
1381 | #ifdef IN_PROCESS_AGENT |
1382 | again: | |
1383 | memory_barrier (); | |
1384 | ||
1385 | /* Read the current token and extract the index to try to write to, | |
1386 | storing it in CURR. */ | |
1387 | prev = trace_buffer_ctrl_curr; | |
1388 | prev_filtered = prev & ~GDBSERVER_FLUSH_COUNT_MASK; | |
1389 | curr = prev_filtered + 1; | |
1390 | if (curr > 2) | |
1391 | curr = 0; | |
1392 | ||
1393 | about_to_request_buffer_space (); | |
1394 | ||
1395 | /* Start out with a copy of the current state. GDBserver may be | |
1396 | midway writing to the PREV_FILTERED TBC, but, that's OK, we won't | |
1397 | be able to commit anyway if that happens. */ | |
1398 | trace_buffer_ctrl[curr] | |
1399 | = trace_buffer_ctrl[prev_filtered]; | |
1400 | trace_debug ("trying curr=%u", curr); | |
1401 | #else | |
1402 | /* The GDBserver's agent doesn't need all that syncing, and always | |
1403 | updates TCB 0 (there's only one, mind you). */ | |
1404 | curr = 0; | |
1405 | #endif | |
1406 | tbctrl = &trace_buffer_ctrl[curr]; | |
1407 | ||
219f2f23 PA |
1408 | /* Offsets are easier to grok for debugging than raw addresses, |
1409 | especially for the small trace buffer sizes that are useful for | |
1410 | testing. */ | |
fa593d66 PA |
1411 | trace_debug ("Trace buffer [%d] start=%d free=%d endfree=%d wrap=%d hi=%d", |
1412 | curr, | |
1413 | (int) (tbctrl->start - trace_buffer_lo), | |
1414 | (int) (tbctrl->free - trace_buffer_lo), | |
1415 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1416 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1417 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1418 | ||
1419 | /* The algorithm here is to keep trying to get a contiguous block of | |
1420 | the requested size, possibly discarding older traceframes to free | |
1421 | up space. Since free space might come in one or two pieces, | |
1422 | depending on whether discarded traceframes wrapped around at the | |
1423 | high end of the buffer, we test both pieces after each | |
1424 | discard. */ | |
1425 | while (1) | |
1426 | { | |
1427 | /* First, if we have two free parts, try the upper one first. */ | |
fa593d66 | 1428 | if (tbctrl->end_free < tbctrl->free) |
219f2f23 | 1429 | { |
fa593d66 | 1430 | if (tbctrl->free + amt <= trace_buffer_hi) |
219f2f23 PA |
1431 | /* We have enough in the upper part. */ |
1432 | break; | |
1433 | else | |
1434 | { | |
1435 | /* Our high part of free space wasn't enough. Give up | |
1436 | on it for now, set wraparound. We will recover the | |
1437 | space later, if/when the wrapped-around traceframe is | |
1438 | discarded. */ | |
1439 | trace_debug ("Upper part too small, setting wraparound"); | |
fa593d66 PA |
1440 | tbctrl->wrap = tbctrl->free; |
1441 | tbctrl->free = trace_buffer_lo; | |
219f2f23 PA |
1442 | } |
1443 | } | |
1444 | ||
1445 | /* The normal case. */ | |
fa593d66 | 1446 | if (tbctrl->free + amt <= tbctrl->end_free) |
219f2f23 PA |
1447 | break; |
1448 | ||
fa593d66 PA |
1449 | #ifdef IN_PROCESS_AGENT |
1450 | /* The IP Agent's buffer is always circular. It isn't used | |
1451 | currently, but `circular_trace_buffer' could represent | |
1452 | GDBserver's mode. If we didn't find space, ask GDBserver to | |
1453 | flush. */ | |
1454 | ||
1455 | flush_trace_buffer (); | |
1456 | memory_barrier (); | |
1457 | if (tracing) | |
1458 | { | |
1459 | trace_debug ("gdbserver flushed buffer, retrying"); | |
1460 | goto again; | |
1461 | } | |
1462 | ||
1463 | /* GDBserver cancelled the tracing. Bail out as well. */ | |
1464 | return NULL; | |
1465 | #else | |
219f2f23 PA |
1466 | /* If we're here, then neither part is big enough, and |
1467 | non-circular trace buffers are now full. */ | |
1468 | if (!circular_trace_buffer) | |
1469 | { | |
1470 | trace_debug ("Not enough space in the trace buffer"); | |
1471 | return NULL; | |
1472 | } | |
1473 | ||
1474 | trace_debug ("Need more space in the trace buffer"); | |
1475 | ||
1476 | /* If we have a circular buffer, we can try discarding the | |
1477 | oldest traceframe and see if that helps. */ | |
1478 | oldest = FIRST_TRACEFRAME (); | |
1479 | if (oldest->tpnum == 0) | |
1480 | { | |
1481 | /* Not good; we have no traceframes to free. Perhaps we're | |
1482 | asking for a block that is larger than the buffer? In | |
1483 | any case, give up. */ | |
1484 | trace_debug ("No traceframes to discard"); | |
1485 | return NULL; | |
1486 | } | |
1487 | ||
fa593d66 PA |
1488 | /* We don't run this code in the in-process agent currently. |
1489 | E.g., we could leave the in-process agent in autonomous | |
1490 | circular mode if we only have fast tracepoints. If we do | |
1491 | that, then this bit becomes racy with GDBserver, which also | |
1492 | writes to this counter. */ | |
219f2f23 PA |
1493 | --traceframe_write_count; |
1494 | ||
1495 | new_start = (unsigned char *) NEXT_TRACEFRAME (oldest); | |
1496 | /* If we freed the traceframe that wrapped around, go back | |
1497 | to the non-wrap case. */ | |
fa593d66 | 1498 | if (new_start < tbctrl->start) |
219f2f23 PA |
1499 | { |
1500 | trace_debug ("Discarding past the wraparound"); | |
fa593d66 | 1501 | tbctrl->wrap = trace_buffer_hi; |
219f2f23 | 1502 | } |
fa593d66 PA |
1503 | tbctrl->start = new_start; |
1504 | tbctrl->end_free = tbctrl->start; | |
219f2f23 PA |
1505 | |
1506 | trace_debug ("Discarded a traceframe\n" | |
fa593d66 PA |
1507 | "Trace buffer [%d], start=%d free=%d " |
1508 | "endfree=%d wrap=%d hi=%d", | |
1509 | curr, | |
1510 | (int) (tbctrl->start - trace_buffer_lo), | |
1511 | (int) (tbctrl->free - trace_buffer_lo), | |
1512 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1513 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1514 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1515 | ||
1516 | /* Now go back around the loop. The discard might have resulted | |
1517 | in either one or two pieces of free space, so we want to try | |
1518 | both before freeing any more traceframes. */ | |
fa593d66 | 1519 | #endif |
219f2f23 PA |
1520 | } |
1521 | ||
1522 | /* If we get here, we know we can provide the asked-for space. */ | |
1523 | ||
fa593d66 | 1524 | rslt = tbctrl->free; |
219f2f23 PA |
1525 | |
1526 | /* Adjust the request back down, now that we know we have space for | |
fa593d66 PA |
1527 | the marker, but don't commit to AMT yet, we may still need to |
1528 | restart the operation if GDBserver touches the trace buffer | |
1529 | (obviously only important in the in-process agent's version). */ | |
1530 | tbctrl->free += (amt - sizeof (struct traceframe)); | |
1531 | ||
1532 | /* Or not. If GDBserver changed the trace buffer behind our back, | |
1533 | we get to restart a new allocation attempt. */ | |
1534 | ||
1535 | #ifdef IN_PROCESS_AGENT | |
1536 | /* Build the tentative token. */ | |
1537 | commit_count = (((prev & 0x0007ff00) + 0x100) & 0x0007ff00); | |
1538 | commit = (((prev & 0x0007ff00) << 12) | |
1539 | | commit_count | |
1540 | | curr); | |
1541 | ||
1542 | /* Try to commit it. */ | |
1543 | readout = cmpxchg (&trace_buffer_ctrl_curr, prev, commit); | |
1544 | if (readout != prev) | |
1545 | { | |
1546 | trace_debug ("GDBserver has touched the trace buffer, restarting." | |
1547 | " (prev=%08x, commit=%08x, readout=%08x)", | |
1548 | prev, commit, readout); | |
1549 | goto again; | |
1550 | } | |
219f2f23 | 1551 | |
fa593d66 PA |
1552 | /* Hold your horses here. Even if that change was committed, |
1553 | GDBserver could come in, and clobber it. We need to hold to be | |
1554 | able to tell if GDBserver clobbers before or after we committed | |
1555 | the change. Whenever GDBserver goes about touching the IPA | |
1556 | buffer, it sets a breakpoint in this routine, so we have a sync | |
1557 | point here. */ | |
1558 | about_to_request_buffer_space (); | |
219f2f23 | 1559 | |
fa593d66 PA |
1560 | /* Check if the change has been effective, even if GDBserver stopped |
1561 | us at the breakpoint. */ | |
219f2f23 | 1562 | |
fa593d66 PA |
1563 | { |
1564 | unsigned int refetch; | |
219f2f23 | 1565 | |
fa593d66 PA |
1566 | memory_barrier (); |
1567 | ||
1568 | refetch = trace_buffer_ctrl_curr; | |
1569 | ||
1570 | if ((refetch == commit | |
1571 | || ((refetch & 0x7ff00000) >> 12) == commit_count)) | |
1572 | { | |
1573 | /* effective */ | |
1574 | trace_debug ("change is effective: (prev=%08x, commit=%08x, " | |
1575 | "readout=%08x, refetch=%08x)", | |
1576 | prev, commit, readout, refetch); | |
1577 | } | |
1578 | else | |
1579 | { | |
1580 | trace_debug ("GDBserver has touched the trace buffer, not effective." | |
1581 | " (prev=%08x, commit=%08x, readout=%08x, refetch=%08x)", | |
1582 | prev, commit, readout, refetch); | |
1583 | goto again; | |
1584 | } | |
1585 | } | |
1586 | #endif | |
1587 | ||
1588 | /* We have a new piece of the trace buffer. Hurray! */ | |
1589 | ||
1590 | /* Add an EOB marker just past this allocation. */ | |
1591 | ((struct traceframe *) tbctrl->free)->tpnum = 0; | |
1592 | ((struct traceframe *) tbctrl->free)->data_size = 0; | |
1593 | ||
1594 | /* Adjust the request back down, now that we know we have space for | |
1595 | the marker. */ | |
1596 | amt -= sizeof (struct traceframe); | |
1597 | ||
1598 | if (debug_threads) | |
1599 | { | |
219f2f23 | 1600 | trace_debug ("Allocated %d bytes", (int) amt); |
fa593d66 PA |
1601 | trace_debug ("Trace buffer [%d] start=%d free=%d " |
1602 | "endfree=%d wrap=%d hi=%d", | |
1603 | curr, | |
1604 | (int) (tbctrl->start - trace_buffer_lo), | |
1605 | (int) (tbctrl->free - trace_buffer_lo), | |
1606 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1607 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1608 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1609 | } | |
1610 | ||
1611 | return rslt; | |
1612 | } | |
1613 | ||
fa593d66 PA |
1614 | #ifndef IN_PROCESS_AGENT |
1615 | ||
219f2f23 PA |
1616 | /* Return the total free space. This is not necessarily the largest |
1617 | block we can allocate, because of the two-part case. */ | |
1618 | ||
1619 | static int | |
1620 | free_space (void) | |
1621 | { | |
1622 | if (trace_buffer_free <= trace_buffer_end_free) | |
1623 | return trace_buffer_end_free - trace_buffer_free; | |
1624 | else | |
1625 | return ((trace_buffer_end_free - trace_buffer_lo) | |
1626 | + (trace_buffer_hi - trace_buffer_free)); | |
1627 | } | |
1628 | ||
1629 | /* An 'S' in continuation packets indicates remainder are for | |
1630 | while-stepping. */ | |
1631 | ||
1632 | static int seen_step_action_flag; | |
1633 | ||
1634 | /* Create a tracepoint (location) with given number and address. */ | |
1635 | ||
1636 | static struct tracepoint * | |
1637 | add_tracepoint (int num, CORE_ADDR addr) | |
1638 | { | |
1639 | struct tracepoint *tpoint; | |
1640 | ||
1641 | tpoint = xmalloc (sizeof (struct tracepoint)); | |
1642 | tpoint->number = num; | |
1643 | tpoint->address = addr; | |
1644 | tpoint->numactions = 0; | |
1645 | tpoint->actions = NULL; | |
1646 | tpoint->actions_str = NULL; | |
1647 | tpoint->cond = NULL; | |
1648 | tpoint->num_step_actions = 0; | |
1649 | tpoint->step_actions = NULL; | |
1650 | tpoint->step_actions_str = NULL; | |
fa593d66 PA |
1651 | /* Start all off as regular (slow) tracepoints. */ |
1652 | tpoint->type = trap_tracepoint; | |
1653 | tpoint->orig_size = -1; | |
219f2f23 | 1654 | tpoint->source_strings = NULL; |
6a271cae | 1655 | tpoint->compiled_cond = 0; |
219f2f23 PA |
1656 | tpoint->handle = NULL; |
1657 | tpoint->next = NULL; | |
1658 | ||
1659 | if (!last_tracepoint) | |
1660 | tracepoints = tpoint; | |
1661 | else | |
1662 | last_tracepoint->next = tpoint; | |
1663 | last_tracepoint = tpoint; | |
1664 | ||
1665 | seen_step_action_flag = 0; | |
1666 | ||
1667 | return tpoint; | |
1668 | } | |
1669 | ||
fa593d66 PA |
1670 | #ifndef IN_PROCESS_AGENT |
1671 | ||
219f2f23 PA |
1672 | /* Return the tracepoint with the given number and address, or NULL. */ |
1673 | ||
1674 | static struct tracepoint * | |
1675 | find_tracepoint (int id, CORE_ADDR addr) | |
1676 | { | |
1677 | struct tracepoint *tpoint; | |
1678 | ||
1679 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
1680 | if (tpoint->number == id && tpoint->address == addr) | |
1681 | return tpoint; | |
1682 | ||
1683 | return NULL; | |
1684 | } | |
1685 | ||
1686 | /* There may be several tracepoints with the same number (because they | |
1687 | are "locations", in GDB parlance); return the next one after the | |
1688 | given tracepoint, or search from the beginning of the list if the | |
1689 | first argument is NULL. */ | |
1690 | ||
1691 | static struct tracepoint * | |
1692 | find_next_tracepoint_by_number (struct tracepoint *prev_tp, int num) | |
1693 | { | |
1694 | struct tracepoint *tpoint; | |
1695 | ||
1696 | if (prev_tp) | |
1697 | tpoint = prev_tp->next; | |
1698 | else | |
1699 | tpoint = tracepoints; | |
1700 | for (; tpoint; tpoint = tpoint->next) | |
1701 | if (tpoint->number == num) | |
1702 | return tpoint; | |
1703 | ||
1704 | return NULL; | |
1705 | } | |
1706 | ||
fa593d66 PA |
1707 | #endif |
1708 | ||
219f2f23 PA |
1709 | static char * |
1710 | save_string (const char *str, size_t len) | |
1711 | { | |
1712 | char *s; | |
1713 | ||
1714 | s = xmalloc (len + 1); | |
1715 | memcpy (s, str, len); | |
1716 | s[len] = '\0'; | |
1717 | ||
1718 | return s; | |
1719 | } | |
1720 | ||
1721 | /* Append another action to perform when the tracepoint triggers. */ | |
1722 | ||
1723 | static void | |
1724 | add_tracepoint_action (struct tracepoint *tpoint, char *packet) | |
1725 | { | |
1726 | char *act; | |
1727 | ||
1728 | if (*packet == 'S') | |
1729 | { | |
1730 | seen_step_action_flag = 1; | |
1731 | ++packet; | |
1732 | } | |
1733 | ||
1734 | act = packet; | |
1735 | ||
1736 | while (*act) | |
1737 | { | |
1738 | char *act_start = act; | |
1739 | struct tracepoint_action *action = NULL; | |
1740 | ||
1741 | switch (*act) | |
1742 | { | |
1743 | case 'M': | |
1744 | { | |
1745 | struct collect_memory_action *maction; | |
1746 | ULONGEST basereg; | |
1747 | int is_neg; | |
1748 | ||
1749 | maction = xmalloc (sizeof *maction); | |
1750 | maction->base.type = *act; | |
1751 | action = &maction->base; | |
1752 | ||
1753 | ++act; | |
1754 | is_neg = (*act == '-'); | |
1755 | if (*act == '-') | |
1756 | ++act; | |
1757 | act = unpack_varlen_hex (act, &basereg); | |
1758 | ++act; | |
1759 | act = unpack_varlen_hex (act, &maction->addr); | |
1760 | ++act; | |
1761 | act = unpack_varlen_hex (act, &maction->len); | |
1762 | maction->basereg = (is_neg | |
1763 | ? - (int) basereg | |
1764 | : (int) basereg); | |
1765 | trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)", | |
1766 | pulongest (maction->len), | |
1767 | paddress (maction->addr), maction->basereg); | |
1768 | break; | |
1769 | } | |
1770 | case 'R': | |
1771 | { | |
1772 | struct collect_registers_action *raction; | |
1773 | ||
1774 | raction = xmalloc (sizeof *raction); | |
1775 | raction->base.type = *act; | |
1776 | action = &raction->base; | |
1777 | ||
1778 | trace_debug ("Want to collect registers"); | |
1779 | ++act; | |
1780 | /* skip past hex digits of mask for now */ | |
1781 | while (isxdigit(*act)) | |
1782 | ++act; | |
1783 | break; | |
1784 | } | |
0fb4aa4b PA |
1785 | case 'L': |
1786 | { | |
1787 | struct collect_static_trace_data_action *raction; | |
1788 | ||
1789 | raction = xmalloc (sizeof *raction); | |
1790 | raction->base.type = *act; | |
1791 | action = &raction->base; | |
1792 | ||
1793 | trace_debug ("Want to collect static trace data"); | |
1794 | ++act; | |
1795 | break; | |
1796 | } | |
219f2f23 PA |
1797 | case 'S': |
1798 | trace_debug ("Unexpected step action, ignoring"); | |
1799 | ++act; | |
1800 | break; | |
1801 | case 'X': | |
1802 | { | |
1803 | struct eval_expr_action *xaction; | |
1804 | ||
1805 | xaction = xmalloc (sizeof (*xaction)); | |
1806 | xaction->base.type = *act; | |
1807 | action = &xaction->base; | |
1808 | ||
1809 | trace_debug ("Want to evaluate expression"); | |
1810 | xaction->expr = parse_agent_expr (&act); | |
1811 | break; | |
1812 | } | |
1813 | default: | |
1814 | trace_debug ("unknown trace action '%c', ignoring...", *act); | |
1815 | break; | |
1816 | case '-': | |
1817 | break; | |
1818 | } | |
1819 | ||
1820 | if (action == NULL) | |
1821 | break; | |
1822 | ||
1823 | if (seen_step_action_flag) | |
1824 | { | |
1825 | tpoint->num_step_actions++; | |
1826 | ||
1827 | tpoint->step_actions | |
1828 | = xrealloc (tpoint->step_actions, | |
1829 | (sizeof (*tpoint->step_actions) | |
1830 | * tpoint->num_step_actions)); | |
1831 | tpoint->step_actions_str | |
1832 | = xrealloc (tpoint->step_actions_str, | |
1833 | (sizeof (*tpoint->step_actions_str) | |
1834 | * tpoint->num_step_actions)); | |
1835 | tpoint->step_actions[tpoint->num_step_actions - 1] = action; | |
1836 | tpoint->step_actions_str[tpoint->num_step_actions - 1] | |
1837 | = save_string (act_start, act - act_start); | |
1838 | } | |
1839 | else | |
1840 | { | |
1841 | tpoint->numactions++; | |
1842 | tpoint->actions | |
1843 | = xrealloc (tpoint->actions, | |
1844 | sizeof (*tpoint->actions) * tpoint->numactions); | |
1845 | tpoint->actions_str | |
1846 | = xrealloc (tpoint->actions_str, | |
1847 | sizeof (*tpoint->actions_str) * tpoint->numactions); | |
1848 | tpoint->actions[tpoint->numactions - 1] = action; | |
1849 | tpoint->actions_str[tpoint->numactions - 1] | |
1850 | = save_string (act_start, act - act_start); | |
1851 | } | |
1852 | } | |
1853 | } | |
1854 | ||
fa593d66 PA |
1855 | #endif |
1856 | ||
219f2f23 PA |
1857 | /* Find or create a trace state variable with the given number. */ |
1858 | ||
1859 | static struct trace_state_variable * | |
1860 | get_trace_state_variable (int num) | |
1861 | { | |
1862 | struct trace_state_variable *tsv; | |
1863 | ||
fa593d66 PA |
1864 | #ifdef IN_PROCESS_AGENT |
1865 | /* Search for an existing variable. */ | |
1866 | for (tsv = alloced_trace_state_variables; tsv; tsv = tsv->next) | |
1867 | if (tsv->number == num) | |
1868 | return tsv; | |
1869 | #endif | |
1870 | ||
219f2f23 PA |
1871 | /* Search for an existing variable. */ |
1872 | for (tsv = trace_state_variables; tsv; tsv = tsv->next) | |
1873 | if (tsv->number == num) | |
1874 | return tsv; | |
1875 | ||
1876 | return NULL; | |
1877 | } | |
1878 | ||
1879 | /* Find or create a trace state variable with the given number. */ | |
1880 | ||
1881 | static struct trace_state_variable * | |
fa593d66 | 1882 | create_trace_state_variable (int num, int gdb) |
219f2f23 PA |
1883 | { |
1884 | struct trace_state_variable *tsv; | |
1885 | ||
1886 | tsv = get_trace_state_variable (num); | |
1887 | if (tsv != NULL) | |
1888 | return tsv; | |
1889 | ||
1890 | /* Create a new variable. */ | |
1891 | tsv = xmalloc (sizeof (struct trace_state_variable)); | |
1892 | tsv->number = num; | |
1893 | tsv->initial_value = 0; | |
1894 | tsv->value = 0; | |
1895 | tsv->getter = NULL; | |
1896 | tsv->name = NULL; | |
fa593d66 PA |
1897 | #ifdef IN_PROCESS_AGENT |
1898 | if (!gdb) | |
1899 | { | |
1900 | tsv->next = alloced_trace_state_variables; | |
1901 | alloced_trace_state_variables = tsv; | |
1902 | } | |
1903 | else | |
1904 | #endif | |
1905 | { | |
1906 | tsv->next = trace_state_variables; | |
1907 | trace_state_variables = tsv; | |
1908 | } | |
219f2f23 PA |
1909 | return tsv; |
1910 | } | |
1911 | ||
6a271cae | 1912 | IP_AGENT_EXPORT LONGEST |
219f2f23 PA |
1913 | get_trace_state_variable_value (int num) |
1914 | { | |
1915 | struct trace_state_variable *tsv; | |
1916 | ||
1917 | tsv = get_trace_state_variable (num); | |
1918 | ||
1919 | if (!tsv) | |
1920 | { | |
1921 | trace_debug ("No trace state variable %d, skipping value get", num); | |
1922 | return 0; | |
1923 | } | |
1924 | ||
1925 | /* Call a getter function if we have one. While it's tempting to | |
1926 | set up something to only call the getter once per tracepoint hit, | |
1927 | it could run afoul of thread races. Better to let the getter | |
1928 | handle it directly, if necessary to worry about it. */ | |
1929 | if (tsv->getter) | |
1930 | tsv->value = (tsv->getter) (); | |
1931 | ||
1932 | trace_debug ("get_trace_state_variable_value(%d) ==> %s", | |
1933 | num, plongest (tsv->value)); | |
1934 | ||
1935 | return tsv->value; | |
1936 | } | |
1937 | ||
6a271cae | 1938 | IP_AGENT_EXPORT void |
219f2f23 PA |
1939 | set_trace_state_variable_value (int num, LONGEST val) |
1940 | { | |
1941 | struct trace_state_variable *tsv; | |
1942 | ||
1943 | tsv = get_trace_state_variable (num); | |
1944 | ||
1945 | if (!tsv) | |
1946 | { | |
1947 | trace_debug ("No trace state variable %d, skipping value set", num); | |
1948 | return; | |
1949 | } | |
1950 | ||
1951 | tsv->value = val; | |
1952 | } | |
1953 | ||
1954 | static void | |
1955 | set_trace_state_variable_name (int num, const char *name) | |
1956 | { | |
1957 | struct trace_state_variable *tsv; | |
1958 | ||
1959 | tsv = get_trace_state_variable (num); | |
1960 | ||
1961 | if (!tsv) | |
1962 | { | |
1963 | trace_debug ("No trace state variable %d, skipping name set", num); | |
1964 | return; | |
1965 | } | |
1966 | ||
1967 | tsv->name = (char *) name; | |
1968 | } | |
1969 | ||
1970 | static void | |
1971 | set_trace_state_variable_getter (int num, LONGEST (*getter) (void)) | |
1972 | { | |
1973 | struct trace_state_variable *tsv; | |
1974 | ||
1975 | tsv = get_trace_state_variable (num); | |
1976 | ||
1977 | if (!tsv) | |
1978 | { | |
1979 | trace_debug ("No trace state variable %d, skipping getter set", num); | |
1980 | return; | |
1981 | } | |
1982 | ||
1983 | tsv->getter = getter; | |
1984 | } | |
1985 | ||
1986 | /* Add a raw traceframe for the given tracepoint. */ | |
1987 | ||
1988 | static struct traceframe * | |
1989 | add_traceframe (struct tracepoint *tpoint) | |
1990 | { | |
1991 | struct traceframe *tframe; | |
1992 | ||
1993 | tframe = trace_buffer_alloc (sizeof (struct traceframe)); | |
1994 | ||
1995 | if (tframe == NULL) | |
1996 | return NULL; | |
1997 | ||
1998 | tframe->tpnum = tpoint->number; | |
1999 | tframe->data_size = 0; | |
2000 | ||
2001 | return tframe; | |
2002 | } | |
2003 | ||
2004 | /* Add a block to the traceframe currently being worked on. */ | |
2005 | ||
2006 | static unsigned char * | |
2007 | add_traceframe_block (struct traceframe *tframe, int amt) | |
2008 | { | |
2009 | unsigned char *block; | |
2010 | ||
2011 | if (!tframe) | |
2012 | return NULL; | |
2013 | ||
2014 | block = trace_buffer_alloc (amt); | |
2015 | ||
2016 | if (!block) | |
2017 | return NULL; | |
2018 | ||
2019 | tframe->data_size += amt; | |
2020 | ||
2021 | return block; | |
2022 | } | |
2023 | ||
2024 | /* Flag that the current traceframe is finished. */ | |
2025 | ||
2026 | static void | |
2027 | finish_traceframe (struct traceframe *tframe) | |
2028 | { | |
2029 | ++traceframe_write_count; | |
2030 | ++traceframes_created; | |
2031 | } | |
2032 | ||
fa593d66 PA |
2033 | #ifndef IN_PROCESS_AGENT |
2034 | ||
219f2f23 PA |
2035 | /* Given a traceframe number NUM, find the NUMth traceframe in the |
2036 | buffer. */ | |
2037 | ||
2038 | static struct traceframe * | |
2039 | find_traceframe (int num) | |
2040 | { | |
2041 | struct traceframe *tframe; | |
2042 | int tfnum = 0; | |
2043 | ||
2044 | for (tframe = FIRST_TRACEFRAME (); | |
2045 | tframe->tpnum != 0; | |
2046 | tframe = NEXT_TRACEFRAME (tframe)) | |
2047 | { | |
2048 | if (tfnum == num) | |
2049 | return tframe; | |
2050 | ++tfnum; | |
2051 | } | |
2052 | ||
2053 | return NULL; | |
2054 | } | |
2055 | ||
2056 | static CORE_ADDR | |
2057 | get_traceframe_address (struct traceframe *tframe) | |
2058 | { | |
2059 | CORE_ADDR addr; | |
2060 | struct tracepoint *tpoint; | |
2061 | ||
2062 | addr = traceframe_get_pc (tframe); | |
2063 | ||
2064 | if (addr) | |
2065 | return addr; | |
2066 | ||
2067 | /* Fallback strategy, will be incorrect for while-stepping frames | |
2068 | and multi-location tracepoints. */ | |
2069 | tpoint = find_next_tracepoint_by_number (NULL, tframe->tpnum); | |
2070 | return tpoint->address; | |
2071 | } | |
2072 | ||
2073 | /* Search for the next traceframe whose address is inside or outside | |
2074 | the given range. */ | |
2075 | ||
2076 | static struct traceframe * | |
2077 | find_next_traceframe_in_range (CORE_ADDR lo, CORE_ADDR hi, int inside_p, | |
2078 | int *tfnump) | |
2079 | { | |
2080 | struct traceframe *tframe; | |
2081 | CORE_ADDR tfaddr; | |
2082 | ||
2083 | *tfnump = current_traceframe + 1; | |
2084 | tframe = find_traceframe (*tfnump); | |
2085 | /* The search is not supposed to wrap around. */ | |
2086 | if (!tframe) | |
2087 | { | |
2088 | *tfnump = -1; | |
2089 | return NULL; | |
2090 | } | |
2091 | ||
2092 | for (; tframe->tpnum != 0; tframe = NEXT_TRACEFRAME (tframe)) | |
2093 | { | |
2094 | tfaddr = get_traceframe_address (tframe); | |
2095 | if (inside_p | |
2096 | ? (lo <= tfaddr && tfaddr <= hi) | |
2097 | : (lo > tfaddr || tfaddr > hi)) | |
2098 | return tframe; | |
2099 | ++*tfnump; | |
2100 | } | |
2101 | ||
2102 | *tfnump = -1; | |
2103 | return NULL; | |
2104 | } | |
2105 | ||
2106 | /* Search for the next traceframe recorded by the given tracepoint. | |
2107 | Note that for multi-location tracepoints, this will find whatever | |
2108 | location appears first. */ | |
2109 | ||
2110 | static struct traceframe * | |
2111 | find_next_traceframe_by_tracepoint (int num, int *tfnump) | |
2112 | { | |
2113 | struct traceframe *tframe; | |
2114 | ||
2115 | *tfnump = current_traceframe + 1; | |
2116 | tframe = find_traceframe (*tfnump); | |
2117 | /* The search is not supposed to wrap around. */ | |
2118 | if (!tframe) | |
2119 | { | |
2120 | *tfnump = -1; | |
2121 | return NULL; | |
2122 | } | |
2123 | ||
2124 | for (; tframe->tpnum != 0; tframe = NEXT_TRACEFRAME (tframe)) | |
2125 | { | |
2126 | if (tframe->tpnum == num) | |
2127 | return tframe; | |
2128 | ++*tfnump; | |
2129 | } | |
2130 | ||
2131 | *tfnump = -1; | |
2132 | return NULL; | |
2133 | } | |
2134 | ||
fa593d66 PA |
2135 | #endif |
2136 | ||
2137 | #ifndef IN_PROCESS_AGENT | |
2138 | ||
219f2f23 PA |
2139 | /* Clear all past trace state. */ |
2140 | ||
2141 | static void | |
2142 | cmd_qtinit (char *packet) | |
2143 | { | |
2144 | struct trace_state_variable *tsv, *prev, *next; | |
2145 | ||
2146 | /* Make sure we don't try to read from a trace frame. */ | |
2147 | current_traceframe = -1; | |
2148 | ||
2149 | trace_debug ("Initializing the trace"); | |
2150 | ||
2151 | clear_installed_tracepoints (); | |
2152 | clear_readonly_regions (); | |
2153 | ||
2154 | tracepoints = NULL; | |
2155 | last_tracepoint = NULL; | |
2156 | ||
2157 | /* Clear out any leftover trace state variables. Ones with target | |
2158 | defined getters should be kept however. */ | |
2159 | prev = NULL; | |
2160 | tsv = trace_state_variables; | |
2161 | while (tsv) | |
2162 | { | |
2163 | trace_debug ("Looking at var %d", tsv->number); | |
2164 | if (tsv->getter == NULL) | |
2165 | { | |
2166 | next = tsv->next; | |
2167 | if (prev) | |
2168 | prev->next = next; | |
2169 | else | |
2170 | trace_state_variables = next; | |
2171 | trace_debug ("Deleting var %d", tsv->number); | |
2172 | free (tsv); | |
2173 | tsv = next; | |
2174 | } | |
2175 | else | |
2176 | { | |
2177 | prev = tsv; | |
2178 | tsv = tsv->next; | |
2179 | } | |
2180 | } | |
2181 | ||
2182 | clear_trace_buffer (); | |
fa593d66 | 2183 | clear_inferior_trace_buffer (); |
219f2f23 PA |
2184 | |
2185 | write_ok (packet); | |
2186 | } | |
2187 | ||
0fb4aa4b PA |
2188 | /* Unprobe the UST marker at ADDRESS. */ |
2189 | ||
2190 | static void | |
2191 | unprobe_marker_at (CORE_ADDR address) | |
2192 | { | |
2193 | char cmd[CMD_BUF_SIZE]; | |
2194 | ||
2195 | sprintf (cmd, "unprobe_marker_at:%s", paddress (address)); | |
2196 | run_inferior_command (cmd); | |
2197 | } | |
2198 | ||
219f2f23 PA |
2199 | /* Restore the program to its pre-tracing state. This routine may be called |
2200 | in error situations, so it needs to be careful about only restoring | |
2201 | from known-valid bits. */ | |
2202 | ||
2203 | static void | |
2204 | clear_installed_tracepoints (void) | |
2205 | { | |
2206 | struct tracepoint *tpoint; | |
2207 | struct tracepoint *prev_stpoint; | |
2208 | ||
7984d532 PA |
2209 | pause_all (1); |
2210 | cancel_breakpoints (); | |
2211 | ||
219f2f23 PA |
2212 | prev_stpoint = NULL; |
2213 | ||
2214 | /* Restore any bytes overwritten by tracepoints. */ | |
2215 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
2216 | { | |
2217 | if (!tpoint->enabled) | |
2218 | continue; | |
2219 | ||
2220 | /* Catch the case where we might try to remove a tracepoint that | |
2221 | was never actually installed. */ | |
2222 | if (tpoint->handle == NULL) | |
2223 | { | |
2224 | trace_debug ("Tracepoint %d at 0x%s was " | |
2225 | "never installed, nothing to clear", | |
2226 | tpoint->number, paddress (tpoint->address)); | |
2227 | continue; | |
2228 | } | |
2229 | ||
fa593d66 PA |
2230 | switch (tpoint->type) |
2231 | { | |
2232 | case trap_tracepoint: | |
2233 | delete_breakpoint (tpoint->handle); | |
2234 | break; | |
2235 | case fast_tracepoint: | |
2236 | delete_fast_tracepoint_jump (tpoint->handle); | |
2237 | break; | |
0fb4aa4b PA |
2238 | case static_tracepoint: |
2239 | if (prev_stpoint != NULL | |
2240 | && prev_stpoint->address == tpoint->address) | |
2241 | /* Nothing to do. We already unprobed a tracepoint set at | |
2242 | this marker address (and there can only be one probe | |
2243 | per marker). */ | |
2244 | ; | |
2245 | else | |
2246 | { | |
2247 | unprobe_marker_at (tpoint->address); | |
2248 | prev_stpoint = tpoint; | |
2249 | } | |
2250 | break; | |
fa593d66 PA |
2251 | } |
2252 | ||
219f2f23 PA |
2253 | tpoint->handle = NULL; |
2254 | } | |
7984d532 PA |
2255 | |
2256 | unpause_all (1); | |
219f2f23 PA |
2257 | } |
2258 | ||
2259 | /* Parse a packet that defines a tracepoint. */ | |
2260 | ||
2261 | static void | |
2262 | cmd_qtdp (char *own_buf) | |
2263 | { | |
2264 | int tppacket; | |
2265 | ULONGEST num; | |
2266 | ULONGEST addr; | |
2267 | ULONGEST count; | |
2268 | struct tracepoint *tpoint; | |
2269 | char *actparm; | |
2270 | char *packet = own_buf; | |
2271 | ||
2272 | packet += strlen ("QTDP:"); | |
2273 | ||
2274 | /* A hyphen at the beginning marks a packet specifying actions for a | |
2275 | tracepoint already supplied. */ | |
2276 | tppacket = 1; | |
2277 | if (*packet == '-') | |
2278 | { | |
2279 | tppacket = 0; | |
2280 | ++packet; | |
2281 | } | |
2282 | packet = unpack_varlen_hex (packet, &num); | |
2283 | ++packet; /* skip a colon */ | |
2284 | packet = unpack_varlen_hex (packet, &addr); | |
2285 | ++packet; /* skip a colon */ | |
2286 | ||
2287 | /* See if we already have this tracepoint. */ | |
2288 | tpoint = find_tracepoint (num, addr); | |
2289 | ||
2290 | if (tppacket) | |
2291 | { | |
2292 | /* Duplicate tracepoints are never allowed. */ | |
2293 | if (tpoint) | |
2294 | { | |
2295 | trace_debug ("Tracepoint error: tracepoint %d" | |
2296 | " at 0x%s already exists", | |
2297 | (int) num, paddress (addr)); | |
2298 | write_enn (own_buf); | |
2299 | return; | |
2300 | } | |
2301 | ||
2302 | tpoint = add_tracepoint (num, addr); | |
2303 | ||
2304 | tpoint->enabled = (*packet == 'E'); | |
2305 | ++packet; /* skip 'E' */ | |
2306 | ++packet; /* skip a colon */ | |
2307 | packet = unpack_varlen_hex (packet, &count); | |
2308 | tpoint->step_count = count; | |
2309 | ++packet; /* skip a colon */ | |
2310 | packet = unpack_varlen_hex (packet, &count); | |
2311 | tpoint->pass_count = count; | |
2312 | /* See if we have any of the additional optional fields. */ | |
2313 | while (*packet == ':') | |
2314 | { | |
2315 | ++packet; | |
fa593d66 PA |
2316 | if (*packet == 'F') |
2317 | { | |
2318 | tpoint->type = fast_tracepoint; | |
2319 | ++packet; | |
2320 | packet = unpack_varlen_hex (packet, &count); | |
2321 | tpoint->orig_size = count; | |
2322 | } | |
0fb4aa4b PA |
2323 | else if (*packet == 'S') |
2324 | { | |
2325 | tpoint->type = static_tracepoint; | |
2326 | ++packet; | |
2327 | } | |
fa593d66 | 2328 | else if (*packet == 'X') |
219f2f23 PA |
2329 | { |
2330 | actparm = (char *) packet; | |
2331 | tpoint->cond = parse_agent_expr (&actparm); | |
2332 | packet = actparm; | |
2333 | } | |
2334 | else if (*packet == '-') | |
2335 | break; | |
2336 | else if (*packet == '\0') | |
2337 | break; | |
2338 | else | |
2339 | trace_debug ("Unknown optional tracepoint field"); | |
2340 | } | |
2341 | if (*packet == '-') | |
2342 | trace_debug ("Also has actions\n"); | |
2343 | ||
fa593d66 | 2344 | trace_debug ("Defined %stracepoint %d at 0x%s, " |
219f2f23 | 2345 | "enabled %d step %ld pass %ld", |
fa593d66 PA |
2346 | tpoint->type == fast_tracepoint ? "fast " |
2347 | : "", | |
2348 | tpoint->number, paddress (tpoint->address), tpoint->enabled, | |
219f2f23 PA |
2349 | tpoint->step_count, tpoint->pass_count); |
2350 | } | |
2351 | else if (tpoint) | |
2352 | add_tracepoint_action (tpoint, packet); | |
2353 | else | |
2354 | { | |
2355 | trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found", | |
2356 | (int) num, paddress (addr)); | |
2357 | write_enn (own_buf); | |
2358 | return; | |
2359 | } | |
2360 | ||
2361 | write_ok (own_buf); | |
2362 | } | |
2363 | ||
2364 | static void | |
2365 | cmd_qtdpsrc (char *own_buf) | |
2366 | { | |
2367 | ULONGEST num, addr, start, slen; | |
2368 | struct tracepoint *tpoint; | |
2369 | char *packet = own_buf; | |
2370 | char *saved, *srctype, *src; | |
2371 | size_t nbytes; | |
2372 | struct source_string *last, *newlast; | |
2373 | ||
2374 | packet += strlen ("QTDPsrc:"); | |
2375 | ||
2376 | packet = unpack_varlen_hex (packet, &num); | |
2377 | ++packet; /* skip a colon */ | |
2378 | packet = unpack_varlen_hex (packet, &addr); | |
2379 | ++packet; /* skip a colon */ | |
2380 | ||
2381 | /* See if we already have this tracepoint. */ | |
2382 | tpoint = find_tracepoint (num, addr); | |
2383 | ||
2384 | if (!tpoint) | |
2385 | { | |
2386 | trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found", | |
2387 | (int) num, paddress (addr)); | |
2388 | write_enn (own_buf); | |
2389 | return; | |
2390 | } | |
2391 | ||
2392 | saved = packet; | |
2393 | packet = strchr (packet, ':'); | |
2394 | srctype = xmalloc (packet - saved + 1); | |
2395 | memcpy (srctype, saved, packet - saved); | |
2396 | srctype[packet - saved] = '\0'; | |
2397 | ++packet; | |
2398 | packet = unpack_varlen_hex (packet, &start); | |
2399 | ++packet; /* skip a colon */ | |
2400 | packet = unpack_varlen_hex (packet, &slen); | |
2401 | ++packet; /* skip a colon */ | |
2402 | src = xmalloc (slen + 1); | |
2403 | nbytes = unhexify (src, packet, strlen (packet) / 2); | |
2404 | src[nbytes] = '\0'; | |
2405 | ||
2406 | newlast = xmalloc (sizeof (struct source_string)); | |
2407 | newlast->type = srctype; | |
2408 | newlast->str = src; | |
2409 | newlast->next = NULL; | |
2410 | /* Always add a source string to the end of the list; | |
2411 | this keeps sequences of actions/commands in the right | |
2412 | order. */ | |
2413 | if (tpoint->source_strings) | |
2414 | { | |
2415 | for (last = tpoint->source_strings; last->next; last = last->next) | |
2416 | ; | |
2417 | last->next = newlast; | |
2418 | } | |
2419 | else | |
2420 | tpoint->source_strings = newlast; | |
2421 | ||
2422 | write_ok (own_buf); | |
2423 | } | |
2424 | ||
2425 | static void | |
2426 | cmd_qtdv (char *own_buf) | |
2427 | { | |
2428 | ULONGEST num, val, builtin; | |
2429 | char *varname; | |
2430 | size_t nbytes; | |
2431 | struct trace_state_variable *tsv; | |
2432 | char *packet = own_buf; | |
2433 | ||
2434 | packet += strlen ("QTDV:"); | |
2435 | ||
2436 | packet = unpack_varlen_hex (packet, &num); | |
2437 | ++packet; /* skip a colon */ | |
2438 | packet = unpack_varlen_hex (packet, &val); | |
2439 | ++packet; /* skip a colon */ | |
2440 | packet = unpack_varlen_hex (packet, &builtin); | |
2441 | ++packet; /* skip a colon */ | |
2442 | ||
2443 | nbytes = strlen (packet) / 2; | |
2444 | varname = xmalloc (nbytes + 1); | |
2445 | nbytes = unhexify (varname, packet, nbytes); | |
2446 | varname[nbytes] = '\0'; | |
2447 | ||
fa593d66 | 2448 | tsv = create_trace_state_variable (num, 1); |
219f2f23 PA |
2449 | tsv->initial_value = (LONGEST) val; |
2450 | tsv->name = varname; | |
2451 | ||
2452 | set_trace_state_variable_value (num, (LONGEST) val); | |
2453 | ||
2454 | write_ok (own_buf); | |
2455 | } | |
2456 | ||
2457 | static void | |
2458 | cmd_qtv (char *own_buf) | |
2459 | { | |
2460 | ULONGEST num; | |
2461 | LONGEST val; | |
2462 | int err; | |
2463 | char *packet = own_buf; | |
2464 | ||
2465 | packet += strlen ("qTV:"); | |
2466 | packet = unpack_varlen_hex (packet, &num); | |
2467 | ||
2468 | if (current_traceframe >= 0) | |
2469 | { | |
2470 | err = traceframe_read_tsv ((int) num, &val); | |
2471 | if (err) | |
2472 | { | |
2473 | strcpy (own_buf, "U"); | |
2474 | return; | |
2475 | } | |
2476 | } | |
2477 | /* Only make tsv's be undefined before the first trace run. After a | |
2478 | trace run is over, the user might want to see the last value of | |
2479 | the tsv, and it might not be available in a traceframe. */ | |
2480 | else if (!tracing && strcmp (tracing_stop_reason, "tnotrun") == 0) | |
2481 | { | |
2482 | strcpy (own_buf, "U"); | |
2483 | return; | |
2484 | } | |
2485 | else | |
2486 | val = get_trace_state_variable_value (num); | |
2487 | ||
2488 | sprintf (own_buf, "V%s", phex_nz (val, 0)); | |
2489 | } | |
2490 | ||
2491 | /* Clear out the list of readonly regions. */ | |
2492 | ||
2493 | static void | |
2494 | clear_readonly_regions (void) | |
2495 | { | |
2496 | struct readonly_region *roreg; | |
2497 | ||
2498 | while (readonly_regions) | |
2499 | { | |
2500 | roreg = readonly_regions; | |
2501 | readonly_regions = readonly_regions->next; | |
2502 | free (roreg); | |
2503 | } | |
2504 | } | |
2505 | ||
2506 | /* Parse the collection of address ranges whose contents GDB believes | |
2507 | to be unchanging and so can be read directly from target memory | |
2508 | even while looking at a traceframe. */ | |
2509 | ||
2510 | static void | |
2511 | cmd_qtro (char *own_buf) | |
2512 | { | |
2513 | ULONGEST start, end; | |
2514 | struct readonly_region *roreg; | |
2515 | char *packet = own_buf; | |
2516 | ||
2517 | trace_debug ("Want to mark readonly regions"); | |
2518 | ||
2519 | clear_readonly_regions (); | |
2520 | ||
2521 | packet += strlen ("QTro"); | |
2522 | ||
2523 | while (*packet == ':') | |
2524 | { | |
2525 | ++packet; /* skip a colon */ | |
2526 | packet = unpack_varlen_hex (packet, &start); | |
2527 | ++packet; /* skip a comma */ | |
2528 | packet = unpack_varlen_hex (packet, &end); | |
2529 | roreg = xmalloc (sizeof (struct readonly_region)); | |
2530 | roreg->start = start; | |
2531 | roreg->end = end; | |
2532 | roreg->next = readonly_regions; | |
2533 | readonly_regions = roreg; | |
2534 | trace_debug ("Added readonly region from 0x%s to 0x%s", | |
2535 | paddress (roreg->start), paddress (roreg->end)); | |
2536 | } | |
2537 | ||
2538 | write_ok (own_buf); | |
2539 | } | |
2540 | ||
2541 | /* Test to see if the given range is in our list of readonly ranges. | |
2542 | We only test for being entirely within a range, GDB is not going to | |
2543 | send a single memory packet that spans multiple regions. */ | |
2544 | ||
2545 | int | |
2546 | in_readonly_region (CORE_ADDR addr, ULONGEST length) | |
2547 | { | |
2548 | struct readonly_region *roreg; | |
2549 | ||
2550 | for (roreg = readonly_regions; roreg; roreg = roreg->next) | |
2551 | if (roreg->start <= addr && (addr + length - 1) <= roreg->end) | |
2552 | return 1; | |
2553 | ||
2554 | return 0; | |
2555 | } | |
2556 | ||
fa593d66 PA |
2557 | /* The maximum size of a jump pad entry. */ |
2558 | static const int max_jump_pad_size = 0x100; | |
2559 | ||
2560 | static CORE_ADDR gdb_jump_pad_head; | |
2561 | ||
2562 | /* Return the address of the next free jump space. */ | |
2563 | ||
2564 | static CORE_ADDR | |
2565 | get_jump_space_head (void) | |
2566 | { | |
2567 | if (gdb_jump_pad_head == 0) | |
2568 | { | |
2569 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer, | |
2570 | &gdb_jump_pad_head)) | |
2571 | fatal ("error extracting jump_pad_buffer"); | |
2572 | } | |
2573 | ||
2574 | return gdb_jump_pad_head; | |
2575 | } | |
2576 | ||
2577 | /* Reserve USED bytes from the jump space. */ | |
2578 | ||
2579 | static void | |
2580 | claim_jump_space (ULONGEST used) | |
2581 | { | |
2582 | trace_debug ("claim_jump_space reserves %s bytes at %s", | |
2583 | pulongest (used), paddress (gdb_jump_pad_head)); | |
2584 | gdb_jump_pad_head += used; | |
2585 | } | |
2586 | ||
2587 | /* Sort tracepoints by PC, using a bubble sort. */ | |
2588 | ||
2589 | static void | |
2590 | sort_tracepoints (void) | |
2591 | { | |
2592 | struct tracepoint *lst, *tmp, *prev = NULL; | |
2593 | int i, j, n = 0; | |
2594 | ||
2595 | if (tracepoints == NULL) | |
2596 | return; | |
2597 | ||
2598 | /* Count nodes. */ | |
2599 | for (tmp = tracepoints; tmp->next; tmp = tmp->next) | |
2600 | n++; | |
2601 | ||
2602 | for (i = 0; i < n - 1; i++) | |
2603 | for (j = 0, lst = tracepoints; | |
2604 | lst && lst->next && (j <= n - 1 - i); | |
2605 | j++) | |
2606 | { | |
2607 | /* If we're at beginning, the start node is the prev | |
2608 | node. */ | |
2609 | if (j == 0) | |
2610 | prev = lst; | |
2611 | ||
2612 | /* Compare neighbors. */ | |
2613 | if (lst->next->address < lst->address) | |
2614 | { | |
2615 | struct tracepoint *p; | |
2616 | ||
2617 | /* Swap'em. */ | |
2618 | tmp = (lst->next ? lst->next->next : NULL); | |
2619 | ||
2620 | if (j == 0 && prev == tracepoints) | |
2621 | tracepoints = lst->next; | |
2622 | ||
2623 | p = lst->next; | |
2624 | prev->next = lst->next; | |
2625 | lst->next->next = lst; | |
2626 | lst->next = tmp; | |
2627 | prev = p; | |
2628 | } | |
2629 | else | |
2630 | { | |
2631 | lst = lst->next; | |
2632 | /* Keep track of the previous node. We need it if we need | |
2633 | to swap nodes. */ | |
2634 | if (j != 0) | |
2635 | prev = prev->next; | |
2636 | } | |
2637 | } | |
2638 | } | |
2639 | ||
0fb4aa4b PA |
2640 | /* Ask the IPA to probe the marker at ADDRESS. Returns -1 if running |
2641 | the command fails, or 0 otherwise. If the command ran | |
2642 | successfully, but probing the marker failed, ERROUT will be filled | |
2643 | with the error to reply to GDB, and -1 is also returned. This | |
2644 | allows directly passing IPA errors to GDB. */ | |
2645 | ||
2646 | static int | |
2647 | probe_marker_at (CORE_ADDR address, char *errout) | |
2648 | { | |
2649 | char cmd[CMD_BUF_SIZE]; | |
2650 | int err; | |
2651 | ||
2652 | sprintf (cmd, "probe_marker_at:%s", paddress (address)); | |
2653 | err = run_inferior_command (cmd); | |
2654 | ||
2655 | if (err == 0) | |
2656 | { | |
2657 | if (*cmd == 'E') | |
2658 | { | |
2659 | strcpy (errout, cmd); | |
2660 | return -1; | |
2661 | } | |
2662 | } | |
2663 | ||
2664 | return err; | |
2665 | } | |
2666 | ||
fa593d66 PA |
2667 | #define MAX_JUMP_SIZE 20 |
2668 | ||
219f2f23 PA |
2669 | static void |
2670 | cmd_qtstart (char *packet) | |
2671 | { | |
0fb4aa4b | 2672 | struct tracepoint *tpoint, *prev_ftpoint, *prev_stpoint; |
fa593d66 PA |
2673 | int slow_tracepoint_count, fast_count; |
2674 | CORE_ADDR jump_entry; | |
2675 | ||
2676 | /* The jump to the jump pad of the last fast tracepoint | |
2677 | installed. */ | |
2678 | unsigned char fjump[MAX_JUMP_SIZE]; | |
2679 | ULONGEST fjump_size; | |
219f2f23 PA |
2680 | |
2681 | trace_debug ("Starting the trace"); | |
2682 | ||
fa593d66 | 2683 | slow_tracepoint_count = fast_count = 0; |
219f2f23 | 2684 | |
fa593d66 PA |
2685 | /* Sort tracepoints by ascending address. This makes installing |
2686 | fast tracepoints at the same address easier to handle. */ | |
2687 | sort_tracepoints (); | |
219f2f23 | 2688 | |
7984d532 | 2689 | /* Pause all threads temporarily while we patch tracepoints. */ |
fa593d66 PA |
2690 | pause_all (0); |
2691 | ||
2692 | /* Get threads out of jump pads. Safe to do here, since this is a | |
2693 | top level command. And, required to do here, since we're | |
2694 | deleting/rewriting jump pads. */ | |
2695 | ||
2696 | stabilize_threads (); | |
2697 | ||
2698 | /* Freeze threads. */ | |
7984d532 PA |
2699 | pause_all (1); |
2700 | ||
fa593d66 PA |
2701 | /* Sync the fast tracepoints list in the inferior ftlib. */ |
2702 | if (in_process_agent_loaded ()) | |
2703 | { | |
2704 | download_tracepoints (); | |
2705 | download_trace_state_variables (); | |
2706 | } | |
2707 | ||
2708 | /* No previous fast tpoint yet. */ | |
2709 | prev_ftpoint = NULL; | |
2710 | ||
0fb4aa4b PA |
2711 | /* No previous static tpoint yet. */ |
2712 | prev_stpoint = NULL; | |
2713 | ||
fa593d66 PA |
2714 | *packet = '\0'; |
2715 | ||
219f2f23 PA |
2716 | /* Install tracepoints. */ |
2717 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
2718 | { | |
2719 | /* Ensure all the hit counts start at zero. */ | |
2720 | tpoint->hit_count = 0; | |
2721 | ||
2722 | if (!tpoint->enabled) | |
2723 | continue; | |
2724 | ||
fa593d66 PA |
2725 | if (tpoint->type == trap_tracepoint) |
2726 | { | |
2727 | ++slow_tracepoint_count; | |
2728 | ||
2729 | /* Tracepoints are installed as memory breakpoints. Just go | |
2730 | ahead and install the trap. The breakpoints module | |
2731 | handles duplicated breakpoints, and the memory read | |
2732 | routine handles un-patching traps from memory reads. */ | |
2733 | tpoint->handle = set_breakpoint_at (tpoint->address, | |
2734 | tracepoint_handler); | |
2735 | } | |
2736 | else if (tpoint->type == fast_tracepoint) | |
2737 | { | |
2738 | ++fast_count; | |
2739 | ||
2740 | if (maybe_write_ipa_not_loaded (packet)) | |
2741 | { | |
2742 | trace_debug ("Requested a fast tracepoint, but fast " | |
2743 | "tracepoints aren't supported."); | |
2744 | break; | |
2745 | } | |
2746 | ||
2747 | if (prev_ftpoint != NULL && prev_ftpoint->address == tpoint->address) | |
2748 | { | |
2749 | tpoint->handle = set_fast_tracepoint_jump (tpoint->address, | |
2750 | fjump, | |
2751 | fjump_size); | |
2752 | tpoint->jump_pad = prev_ftpoint->jump_pad; | |
2753 | tpoint->jump_pad_end = prev_ftpoint->jump_pad_end; | |
2754 | tpoint->adjusted_insn_addr = prev_ftpoint->adjusted_insn_addr; | |
2755 | tpoint->adjusted_insn_addr_end | |
2756 | = prev_ftpoint->adjusted_insn_addr_end; | |
2757 | } | |
2758 | else | |
2759 | { | |
2760 | CORE_ADDR jentry; | |
2761 | int err = 0; | |
2762 | ||
2763 | prev_ftpoint = NULL; | |
2764 | ||
2765 | jentry = jump_entry = get_jump_space_head (); | |
2766 | ||
2767 | /* Install the jump pad. */ | |
2768 | err = install_fast_tracepoint_jump_pad | |
2769 | (tpoint->obj_addr_on_target, | |
2770 | tpoint->address, | |
2771 | ipa_sym_addrs.addr_gdb_collect, | |
2772 | ipa_sym_addrs.addr_collecting, | |
2773 | tpoint->orig_size, | |
2774 | &jentry, | |
2775 | fjump, &fjump_size, | |
2776 | &tpoint->adjusted_insn_addr, | |
2777 | &tpoint->adjusted_insn_addr_end); | |
2778 | ||
2779 | /* Wire it in. */ | |
2780 | if (!err) | |
2781 | tpoint->handle = set_fast_tracepoint_jump (tpoint->address, | |
2782 | fjump, fjump_size); | |
2783 | ||
2784 | if (tpoint->handle != NULL) | |
2785 | { | |
2786 | tpoint->jump_pad = jump_entry; | |
2787 | tpoint->jump_pad_end = jentry; | |
219f2f23 | 2788 | |
fa593d66 PA |
2789 | /* Pad to 8-byte alignment. */ |
2790 | jentry = ((jentry + 7) & ~0x7); | |
2791 | claim_jump_space (jentry - jump_entry); | |
219f2f23 | 2792 | |
fa593d66 PA |
2793 | /* So that we can handle multiple fast tracepoints |
2794 | at the same address easily. */ | |
2795 | prev_ftpoint = tpoint; | |
2796 | } | |
2797 | } | |
2798 | } | |
0fb4aa4b PA |
2799 | else if (tpoint->type == static_tracepoint) |
2800 | { | |
2801 | if (maybe_write_ipa_ust_not_loaded (packet)) | |
2802 | { | |
2803 | trace_debug ("Requested a static tracepoint, but static " | |
2804 | "tracepoints are not supported."); | |
2805 | break; | |
2806 | } | |
2807 | ||
2808 | /* Can only probe a given marker once. */ | |
2809 | if (prev_stpoint != NULL && prev_stpoint->address == tpoint->address) | |
2810 | { | |
2811 | tpoint->handle = (void *) -1; | |
2812 | } | |
2813 | else | |
2814 | { | |
2815 | if (probe_marker_at (tpoint->address, packet) == 0) | |
2816 | { | |
2817 | tpoint->handle = (void *) -1; | |
2818 | ||
2819 | /* So that we can handle multiple static tracepoints | |
2820 | at the same address easily. */ | |
2821 | prev_stpoint = tpoint; | |
2822 | } | |
2823 | } | |
2824 | } | |
fa593d66 PA |
2825 | |
2826 | /* Any failure in the inner loop is sufficient cause to give | |
2827 | up. */ | |
219f2f23 PA |
2828 | if (tpoint->handle == NULL) |
2829 | break; | |
2830 | } | |
2831 | ||
2832 | /* Any error in tracepoint insertion is unacceptable; better to | |
2833 | address the problem now, than end up with a useless or misleading | |
2834 | trace run. */ | |
2835 | if (tpoint != NULL) | |
2836 | { | |
2837 | clear_installed_tracepoints (); | |
2838 | if (*packet == '\0') | |
2839 | write_enn (packet); | |
7984d532 | 2840 | unpause_all (1); |
219f2f23 PA |
2841 | return; |
2842 | } | |
2843 | ||
2844 | stopping_tracepoint = NULL; | |
2845 | trace_buffer_is_full = 0; | |
2846 | expr_eval_result = expr_eval_no_error; | |
2847 | error_tracepoint = NULL; | |
2848 | ||
2849 | /* Tracing is now active, hits will now start being logged. */ | |
2850 | tracing = 1; | |
2851 | ||
fa593d66 PA |
2852 | if (in_process_agent_loaded ()) |
2853 | { | |
2854 | if (write_inferior_integer (ipa_sym_addrs.addr_tracing, 1)) | |
2855 | fatal ("Error setting tracing variable in lib"); | |
2856 | ||
2857 | if (write_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, | |
2858 | 0)) | |
2859 | fatal ("Error clearing stopping_tracepoint variable in lib"); | |
2860 | ||
2861 | if (write_inferior_integer (ipa_sym_addrs.addr_trace_buffer_is_full, 0)) | |
2862 | fatal ("Error clearing trace_buffer_is_full variable in lib"); | |
2863 | ||
2864 | stop_tracing_bkpt = set_breakpoint_at (ipa_sym_addrs.addr_stop_tracing, | |
2865 | stop_tracing_handler); | |
2866 | if (stop_tracing_bkpt == NULL) | |
2867 | error ("Error setting stop_tracing breakpoint"); | |
2868 | ||
2869 | flush_trace_buffer_bkpt | |
2870 | = set_breakpoint_at (ipa_sym_addrs.addr_flush_trace_buffer, | |
2871 | flush_trace_buffer_handler); | |
2872 | if (flush_trace_buffer_bkpt == NULL) | |
2873 | error ("Error setting flush_trace_buffer breakpoint"); | |
2874 | } | |
2875 | ||
7984d532 PA |
2876 | unpause_all (1); |
2877 | ||
219f2f23 PA |
2878 | write_ok (packet); |
2879 | } | |
2880 | ||
2881 | /* End a tracing run, filling in a stop reason to report back to GDB, | |
2882 | and removing the tracepoints from the code. */ | |
2883 | ||
8336d594 | 2884 | void |
219f2f23 PA |
2885 | stop_tracing (void) |
2886 | { | |
2887 | if (!tracing) | |
2888 | { | |
2889 | trace_debug ("Tracing is already off, ignoring"); | |
2890 | return; | |
2891 | } | |
2892 | ||
2893 | trace_debug ("Stopping the trace"); | |
2894 | ||
fa593d66 PA |
2895 | /* Pause all threads before removing fast jumps from memory, |
2896 | breakpoints, and touching IPA state variables (inferior memory). | |
2897 | Some thread may hit the internal tracing breakpoints, or be | |
2898 | collecting this moment, but that's ok, we don't release the | |
2899 | tpoint object's memory or the jump pads here (we only do that | |
2900 | when we're sure we can move all threads out of the jump pads). | |
2901 | We can't now, since we may be getting here due to the inferior | |
2902 | agent calling us. */ | |
7984d532 PA |
2903 | pause_all (1); |
2904 | /* Since we're removing breakpoints, cancel breakpoint hits, | |
2905 | possibly related to the breakpoints we're about to delete. */ | |
2906 | cancel_breakpoints (); | |
2907 | ||
219f2f23 PA |
2908 | /* Stop logging. Tracepoints can still be hit, but they will not be |
2909 | recorded. */ | |
2910 | tracing = 0; | |
fa593d66 PA |
2911 | if (in_process_agent_loaded ()) |
2912 | { | |
2913 | if (write_inferior_integer (ipa_sym_addrs.addr_tracing, 0)) | |
2914 | fatal ("Error clearing tracing variable in lib"); | |
2915 | } | |
219f2f23 PA |
2916 | |
2917 | tracing_stop_reason = "t???"; | |
2918 | tracing_stop_tpnum = 0; | |
2919 | if (stopping_tracepoint) | |
2920 | { | |
2921 | trace_debug ("Stopping the trace because " | |
2922 | "tracepoint %d was hit %ld times", | |
2923 | stopping_tracepoint->number, | |
2924 | stopping_tracepoint->pass_count); | |
2925 | tracing_stop_reason = "tpasscount"; | |
2926 | tracing_stop_tpnum = stopping_tracepoint->number; | |
2927 | } | |
2928 | else if (trace_buffer_is_full) | |
2929 | { | |
2930 | trace_debug ("Stopping the trace because the trace buffer is full"); | |
2931 | tracing_stop_reason = "tfull"; | |
2932 | } | |
2933 | else if (expr_eval_result != expr_eval_no_error) | |
2934 | { | |
2935 | trace_debug ("Stopping the trace because of an expression eval error"); | |
2936 | tracing_stop_reason = eval_result_names[expr_eval_result]; | |
2937 | tracing_stop_tpnum = error_tracepoint->number; | |
2938 | } | |
fa593d66 | 2939 | #ifndef IN_PROCESS_AGENT |
8336d594 PA |
2940 | else if (!gdb_connected ()) |
2941 | { | |
2942 | trace_debug ("Stopping the trace because GDB disconnected"); | |
2943 | tracing_stop_reason = "tdisconnected"; | |
2944 | } | |
fa593d66 | 2945 | #endif |
219f2f23 PA |
2946 | else |
2947 | { | |
2948 | trace_debug ("Stopping the trace because of a tstop command"); | |
2949 | tracing_stop_reason = "tstop"; | |
2950 | } | |
2951 | ||
2952 | stopping_tracepoint = NULL; | |
2953 | error_tracepoint = NULL; | |
2954 | ||
2955 | /* Clear out the tracepoints. */ | |
2956 | clear_installed_tracepoints (); | |
7984d532 | 2957 | |
fa593d66 PA |
2958 | if (in_process_agent_loaded ()) |
2959 | { | |
2960 | /* Pull in fast tracepoint trace frames from the inferior lib | |
2961 | buffer into our buffer, even if our buffer is already full, | |
2962 | because we want to present the full number of created frames | |
2963 | in addition to what fit in the trace buffer. */ | |
2964 | upload_fast_traceframes (); | |
2965 | } | |
2966 | ||
2967 | if (stop_tracing_bkpt != NULL) | |
2968 | { | |
2969 | delete_breakpoint (stop_tracing_bkpt); | |
2970 | stop_tracing_bkpt = NULL; | |
2971 | } | |
2972 | ||
2973 | if (flush_trace_buffer_bkpt != NULL) | |
2974 | { | |
2975 | delete_breakpoint (flush_trace_buffer_bkpt); | |
2976 | flush_trace_buffer_bkpt = NULL; | |
2977 | } | |
2978 | ||
7984d532 | 2979 | unpause_all (1); |
219f2f23 PA |
2980 | } |
2981 | ||
fa593d66 PA |
2982 | static int |
2983 | stop_tracing_handler (CORE_ADDR addr) | |
2984 | { | |
2985 | trace_debug ("lib hit stop_tracing"); | |
2986 | ||
2987 | /* Don't actually handle it here. When we stop tracing we remove | |
2988 | breakpoints from the inferior, and that is not allowed in a | |
2989 | breakpoint handler (as the caller is walking the breakpoint | |
2990 | list). */ | |
2991 | return 0; | |
2992 | } | |
2993 | ||
2994 | static int | |
2995 | flush_trace_buffer_handler (CORE_ADDR addr) | |
2996 | { | |
2997 | trace_debug ("lib hit flush_trace_buffer"); | |
2998 | return 0; | |
2999 | } | |
3000 | ||
219f2f23 PA |
3001 | static void |
3002 | cmd_qtstop (char *packet) | |
3003 | { | |
3004 | stop_tracing (); | |
3005 | write_ok (packet); | |
3006 | } | |
3007 | ||
8336d594 PA |
3008 | static void |
3009 | cmd_qtdisconnected (char *own_buf) | |
3010 | { | |
3011 | ULONGEST setting; | |
3012 | char *packet = own_buf; | |
3013 | ||
3014 | packet += strlen ("QTDisconnected:"); | |
3015 | ||
3016 | unpack_varlen_hex (packet, &setting); | |
3017 | ||
3018 | write_ok (own_buf); | |
3019 | ||
3020 | disconnected_tracing = setting; | |
3021 | } | |
3022 | ||
219f2f23 PA |
3023 | static void |
3024 | cmd_qtframe (char *own_buf) | |
3025 | { | |
3026 | ULONGEST frame, pc, lo, hi, num; | |
3027 | int tfnum, tpnum; | |
3028 | struct traceframe *tframe; | |
3029 | char *packet = own_buf; | |
3030 | ||
3031 | packet += strlen ("QTFrame:"); | |
3032 | ||
3033 | if (strncmp (packet, "pc:", strlen ("pc:")) == 0) | |
3034 | { | |
3035 | packet += strlen ("pc:"); | |
3036 | packet = unpack_varlen_hex (packet, &pc); | |
3037 | trace_debug ("Want to find next traceframe at pc=0x%s", paddress (pc)); | |
3038 | tframe = find_next_traceframe_in_range (pc, pc, 1, &tfnum); | |
3039 | } | |
3040 | else if (strncmp (packet, "range:", strlen ("range:")) == 0) | |
3041 | { | |
3042 | packet += strlen ("range:"); | |
3043 | packet = unpack_varlen_hex (packet, &lo); | |
3044 | ++packet; | |
3045 | packet = unpack_varlen_hex (packet, &hi); | |
3046 | trace_debug ("Want to find next traceframe in the range 0x%s to 0x%s", | |
3047 | paddress (lo), paddress (hi)); | |
3048 | tframe = find_next_traceframe_in_range (lo, hi, 1, &tfnum); | |
3049 | } | |
3050 | else if (strncmp (packet, "outside:", strlen ("outside:")) == 0) | |
3051 | { | |
3052 | packet += strlen ("outside:"); | |
3053 | packet = unpack_varlen_hex (packet, &lo); | |
3054 | ++packet; | |
3055 | packet = unpack_varlen_hex (packet, &hi); | |
3056 | trace_debug ("Want to find next traceframe " | |
3057 | "outside the range 0x%s to 0x%s", | |
3058 | paddress (lo), paddress (hi)); | |
3059 | tframe = find_next_traceframe_in_range (lo, hi, 0, &tfnum); | |
3060 | } | |
3061 | else if (strncmp (packet, "tdp:", strlen ("tdp:")) == 0) | |
3062 | { | |
3063 | packet += strlen ("tdp:"); | |
3064 | packet = unpack_varlen_hex (packet, &num); | |
3065 | tpnum = (int) num; | |
3066 | trace_debug ("Want to find next traceframe for tracepoint %d", tpnum); | |
3067 | tframe = find_next_traceframe_by_tracepoint (tpnum, &tfnum); | |
3068 | } | |
3069 | else | |
3070 | { | |
3071 | unpack_varlen_hex (packet, &frame); | |
3072 | tfnum = (int) frame; | |
3073 | if (tfnum == -1) | |
3074 | { | |
3075 | trace_debug ("Want to stop looking at traceframes"); | |
3076 | current_traceframe = -1; | |
3077 | write_ok (own_buf); | |
3078 | return; | |
3079 | } | |
3080 | trace_debug ("Want to look at traceframe %d", tfnum); | |
3081 | tframe = find_traceframe (tfnum); | |
3082 | } | |
3083 | ||
3084 | if (tframe) | |
3085 | { | |
3086 | current_traceframe = tfnum; | |
3087 | sprintf (own_buf, "F%xT%x", tfnum, tframe->tpnum); | |
3088 | } | |
3089 | else | |
3090 | sprintf (own_buf, "F-1"); | |
3091 | } | |
3092 | ||
3093 | static void | |
3094 | cmd_qtstatus (char *packet) | |
3095 | { | |
3096 | char *stop_reason_rsp = NULL; | |
3097 | ||
3098 | trace_debug ("Returning trace status as %d, stop reason %s", | |
3099 | tracing, tracing_stop_reason); | |
3100 | ||
fa593d66 PA |
3101 | if (in_process_agent_loaded ()) |
3102 | { | |
3103 | pause_all (1); | |
3104 | ||
3105 | upload_fast_traceframes (); | |
3106 | ||
3107 | unpause_all (1); | |
3108 | } | |
3109 | ||
219f2f23 PA |
3110 | stop_reason_rsp = (char *) tracing_stop_reason; |
3111 | ||
3112 | /* The user visible error string in terror needs to be hex encoded. | |
3113 | We leave it as plain string in `tracepoint_stop_reason' to ease | |
3114 | debugging. */ | |
3115 | if (strncmp (stop_reason_rsp, "terror:", strlen ("terror:")) == 0) | |
3116 | { | |
3117 | const char *result_name; | |
3118 | int hexstr_len; | |
3119 | char *p; | |
3120 | ||
3121 | result_name = stop_reason_rsp + strlen ("terror:"); | |
3122 | hexstr_len = strlen (result_name) * 2; | |
3123 | p = stop_reason_rsp = alloca (strlen ("terror:") + hexstr_len + 1); | |
3124 | strcpy (p, "terror:"); | |
3125 | p += strlen (p); | |
3126 | convert_int_to_ascii ((gdb_byte *) result_name, p, strlen (result_name)); | |
3127 | } | |
3128 | ||
8336d594 PA |
3129 | sprintf (packet, |
3130 | "T%d;" | |
3131 | "%s:%x;" | |
3132 | "tframes:%x;tcreated:%x;" | |
3133 | "tfree:%x;tsize:%s;" | |
3134 | "circular:%d;" | |
3135 | "disconn:%d", | |
623ccd72 | 3136 | tracing ? 1 : 0, |
219f2f23 PA |
3137 | stop_reason_rsp, tracing_stop_tpnum, |
3138 | traceframe_count, traceframes_created, | |
8336d594 PA |
3139 | free_space (), phex_nz (trace_buffer_hi - trace_buffer_lo, 0), |
3140 | circular_trace_buffer, | |
3141 | disconnected_tracing); | |
219f2f23 PA |
3142 | } |
3143 | ||
3144 | /* State variables to help return all the tracepoint bits. */ | |
3145 | static struct tracepoint *cur_tpoint; | |
3146 | static int cur_action; | |
3147 | static int cur_step_action; | |
3148 | static struct source_string *cur_source_string; | |
3149 | static struct trace_state_variable *cur_tsv; | |
3150 | ||
3151 | /* Compose a response that is an imitation of the syntax by which the | |
3152 | tracepoint was originally downloaded. */ | |
3153 | ||
3154 | static void | |
3155 | response_tracepoint (char *packet, struct tracepoint *tpoint) | |
3156 | { | |
3157 | char *buf; | |
3158 | ||
3159 | sprintf (packet, "T%x:%s:%c:%lx:%lx", tpoint->number, | |
3160 | paddress (tpoint->address), | |
3161 | (tpoint->enabled ? 'E' : 'D'), tpoint->step_count, | |
3162 | tpoint->pass_count); | |
fa593d66 PA |
3163 | if (tpoint->type == fast_tracepoint) |
3164 | sprintf (packet + strlen (packet), ":F%x", tpoint->orig_size); | |
0fb4aa4b PA |
3165 | else if (tpoint->type == static_tracepoint) |
3166 | sprintf (packet + strlen (packet), ":S"); | |
219f2f23 PA |
3167 | |
3168 | if (tpoint->cond) | |
3169 | { | |
3170 | buf = unparse_agent_expr (tpoint->cond); | |
3171 | sprintf (packet + strlen (packet), ":X%x,%s", | |
3172 | tpoint->cond->length, buf); | |
3173 | free (buf); | |
3174 | } | |
3175 | } | |
3176 | ||
3177 | /* Compose a response that is an imitation of the syntax by which the | |
3178 | tracepoint action was originally downloaded (with the difference | |
3179 | that due to the way we store the actions, this will output a packet | |
3180 | per action, while GDB could have combined more than one action | |
3181 | per-packet. */ | |
3182 | ||
3183 | static void | |
3184 | response_action (char *packet, struct tracepoint *tpoint, | |
3185 | char *taction, int step) | |
3186 | { | |
3187 | sprintf (packet, "%c%x:%s:%s", | |
3188 | (step ? 'S' : 'A'), tpoint->number, paddress (tpoint->address), | |
3189 | taction); | |
3190 | } | |
3191 | ||
3192 | /* Compose a response that is an imitation of the syntax by which the | |
3193 | tracepoint source piece was originally downloaded. */ | |
3194 | ||
3195 | static void | |
3196 | response_source (char *packet, | |
3197 | struct tracepoint *tpoint, struct source_string *src) | |
3198 | { | |
3199 | char *buf; | |
3200 | int len; | |
3201 | ||
3202 | len = strlen (src->str); | |
3203 | buf = alloca (len * 2 + 1); | |
3204 | convert_int_to_ascii ((gdb_byte *) src->str, buf, len); | |
3205 | ||
3206 | sprintf (packet, "Z%x:%s:%s:%x:%x:%s", | |
3207 | tpoint->number, paddress (tpoint->address), | |
3208 | src->type, 0, len, buf); | |
3209 | } | |
3210 | ||
3211 | /* Return the first piece of tracepoint definition, and initialize the | |
3212 | state machine that will iterate through all the tracepoint | |
3213 | bits. */ | |
3214 | ||
3215 | static void | |
3216 | cmd_qtfp (char *packet) | |
3217 | { | |
3218 | trace_debug ("Returning first tracepoint definition piece"); | |
3219 | ||
3220 | cur_tpoint = tracepoints; | |
3221 | cur_action = cur_step_action = -1; | |
3222 | cur_source_string = NULL; | |
3223 | ||
3224 | if (cur_tpoint) | |
3225 | response_tracepoint (packet, cur_tpoint); | |
3226 | else | |
3227 | strcpy (packet, "l"); | |
3228 | } | |
3229 | ||
3230 | /* Return additional pieces of tracepoint definition. Each action and | |
3231 | stepping action must go into its own packet, because of packet size | |
3232 | limits, and so we use state variables to deliver one piece at a | |
3233 | time. */ | |
3234 | ||
3235 | static void | |
3236 | cmd_qtsp (char *packet) | |
3237 | { | |
3238 | trace_debug ("Returning subsequent tracepoint definition piece"); | |
3239 | ||
3240 | if (!cur_tpoint) | |
3241 | { | |
3242 | /* This case would normally never occur, but be prepared for | |
3243 | GDB misbehavior. */ | |
3244 | strcpy (packet, "l"); | |
3245 | } | |
3246 | else if (cur_action < cur_tpoint->numactions - 1) | |
3247 | { | |
3248 | ++cur_action; | |
3249 | response_action (packet, cur_tpoint, | |
3250 | cur_tpoint->actions_str[cur_action], 0); | |
3251 | } | |
3252 | else if (cur_step_action < cur_tpoint->num_step_actions - 1) | |
3253 | { | |
3254 | ++cur_step_action; | |
3255 | response_action (packet, cur_tpoint, | |
3256 | cur_tpoint->step_actions_str[cur_step_action], 1); | |
3257 | } | |
3258 | else if ((cur_source_string | |
3259 | ? cur_source_string->next | |
3260 | : cur_tpoint->source_strings)) | |
3261 | { | |
3262 | if (cur_source_string) | |
3263 | cur_source_string = cur_source_string->next; | |
3264 | else | |
3265 | cur_source_string = cur_tpoint->source_strings; | |
3266 | response_source (packet, cur_tpoint, cur_source_string); | |
3267 | } | |
3268 | else | |
3269 | { | |
3270 | cur_tpoint = cur_tpoint->next; | |
3271 | cur_action = cur_step_action = -1; | |
3272 | cur_source_string = NULL; | |
3273 | if (cur_tpoint) | |
3274 | response_tracepoint (packet, cur_tpoint); | |
3275 | else | |
3276 | strcpy (packet, "l"); | |
3277 | } | |
3278 | } | |
3279 | ||
3280 | /* Compose a response that is an imitation of the syntax by which the | |
3281 | trace state variable was originally downloaded. */ | |
3282 | ||
3283 | static void | |
3284 | response_tsv (char *packet, struct trace_state_variable *tsv) | |
3285 | { | |
3286 | char *buf = (char *) ""; | |
3287 | int namelen; | |
3288 | ||
3289 | if (tsv->name) | |
3290 | { | |
3291 | namelen = strlen (tsv->name); | |
3292 | buf = alloca (namelen * 2 + 1); | |
3293 | convert_int_to_ascii ((gdb_byte *) tsv->name, buf, namelen); | |
3294 | } | |
3295 | ||
3296 | sprintf (packet, "%x:%s:%x:%s", tsv->number, phex_nz (tsv->initial_value, 0), | |
3297 | tsv->getter ? 1 : 0, buf); | |
3298 | } | |
3299 | ||
3300 | /* Return the first trace state variable definition, and initialize | |
3301 | the state machine that will iterate through all the tsv bits. */ | |
3302 | ||
3303 | static void | |
3304 | cmd_qtfv (char *packet) | |
3305 | { | |
3306 | trace_debug ("Returning first trace state variable definition"); | |
3307 | ||
3308 | cur_tsv = trace_state_variables; | |
3309 | ||
3310 | if (cur_tsv) | |
3311 | response_tsv (packet, cur_tsv); | |
3312 | else | |
3313 | strcpy (packet, "l"); | |
3314 | } | |
3315 | ||
3316 | /* Return additional trace state variable definitions. */ | |
3317 | ||
3318 | static void | |
3319 | cmd_qtsv (char *packet) | |
3320 | { | |
3321 | trace_debug ("Returning first trace state variable definition"); | |
3322 | ||
3323 | if (!cur_tpoint) | |
3324 | { | |
3325 | /* This case would normally never occur, but be prepared for | |
3326 | GDB misbehavior. */ | |
3327 | strcpy (packet, "l"); | |
3328 | } | |
3329 | else if (cur_tsv) | |
3330 | { | |
3331 | cur_tsv = cur_tsv->next; | |
3332 | if (cur_tsv) | |
3333 | response_tsv (packet, cur_tsv); | |
3334 | else | |
3335 | strcpy (packet, "l"); | |
3336 | } | |
3337 | else | |
3338 | strcpy (packet, "l"); | |
3339 | } | |
3340 | ||
0fb4aa4b PA |
3341 | /* Return the first static tracepoint marker, and initialize the state |
3342 | machine that will iterate through all the static tracepoints | |
3343 | markers. */ | |
3344 | ||
3345 | static void | |
3346 | cmd_qtfstm (char *packet) | |
3347 | { | |
3348 | if (!maybe_write_ipa_ust_not_loaded (packet)) | |
3349 | run_inferior_command (packet); | |
3350 | } | |
3351 | ||
3352 | /* Return additional static tracepoints markers. */ | |
3353 | ||
3354 | static void | |
3355 | cmd_qtsstm (char *packet) | |
3356 | { | |
3357 | if (!maybe_write_ipa_ust_not_loaded (packet)) | |
3358 | run_inferior_command (packet); | |
3359 | } | |
3360 | ||
3361 | /* Return the definition of the static tracepoint at a given address. | |
3362 | Result packet is the same as qTsST's. */ | |
3363 | ||
3364 | static void | |
3365 | cmd_qtstmat (char *packet) | |
3366 | { | |
3367 | if (!maybe_write_ipa_ust_not_loaded (packet)) | |
3368 | run_inferior_command (packet); | |
3369 | } | |
3370 | ||
219f2f23 PA |
3371 | /* Respond to qTBuffer packet with a block of raw data from the trace |
3372 | buffer. GDB may ask for a lot, but we are allowed to reply with | |
3373 | only as much as will fit within packet limits or whatever. */ | |
3374 | ||
3375 | static void | |
3376 | cmd_qtbuffer (char *own_buf) | |
3377 | { | |
3378 | ULONGEST offset, num, tot; | |
3379 | unsigned char *tbp; | |
3380 | char *packet = own_buf; | |
3381 | ||
3382 | packet += strlen ("qTBuffer:"); | |
3383 | ||
3384 | packet = unpack_varlen_hex (packet, &offset); | |
3385 | ++packet; /* skip a comma */ | |
3386 | packet = unpack_varlen_hex (packet, &num); | |
3387 | ||
3388 | trace_debug ("Want to get trace buffer, %d bytes at offset 0x%s", | |
3389 | (int) num, pulongest (offset)); | |
3390 | ||
3391 | tot = (trace_buffer_hi - trace_buffer_lo) - free_space (); | |
3392 | ||
3393 | /* If we're right at the end, reply specially that we're done. */ | |
3394 | if (offset == tot) | |
3395 | { | |
3396 | strcpy (own_buf, "l"); | |
3397 | return; | |
3398 | } | |
3399 | ||
3400 | /* Object to any other out-of-bounds request. */ | |
3401 | if (offset > tot) | |
3402 | { | |
3403 | write_enn (own_buf); | |
3404 | return; | |
3405 | } | |
3406 | ||
3407 | /* Compute the pointer corresponding to the given offset, accounting | |
3408 | for wraparound. */ | |
3409 | tbp = trace_buffer_start + offset; | |
3410 | if (tbp >= trace_buffer_wrap) | |
3411 | tbp -= (trace_buffer_wrap - trace_buffer_lo); | |
3412 | ||
3413 | /* Trim to the remaining bytes if we're close to the end. */ | |
3414 | if (num > tot - offset) | |
3415 | num = tot - offset; | |
3416 | ||
3417 | /* Trim to available packet size. */ | |
3418 | if (num >= (PBUFSIZ - 16) / 2 ) | |
3419 | num = (PBUFSIZ - 16) / 2; | |
3420 | ||
3421 | convert_int_to_ascii (tbp, own_buf, num); | |
3422 | own_buf[num] = '\0'; | |
3423 | } | |
3424 | ||
3425 | static void | |
3426 | cmd_bigqtbuffer (char *own_buf) | |
3427 | { | |
3428 | ULONGEST val; | |
3429 | char *packet = own_buf; | |
3430 | ||
3431 | packet += strlen ("QTBuffer:"); | |
3432 | ||
3433 | if (strncmp ("circular:", packet, strlen ("circular:")) == 0) | |
3434 | { | |
3435 | packet += strlen ("circular:"); | |
3436 | packet = unpack_varlen_hex (packet, &val); | |
3437 | circular_trace_buffer = val; | |
3438 | trace_debug ("Trace buffer is now %s", | |
3439 | circular_trace_buffer ? "circular" : "linear"); | |
3440 | write_ok (own_buf); | |
3441 | } | |
3442 | else | |
3443 | write_enn (own_buf); | |
3444 | } | |
3445 | ||
3446 | int | |
3447 | handle_tracepoint_general_set (char *packet) | |
3448 | { | |
3449 | if (strcmp ("QTinit", packet) == 0) | |
3450 | { | |
3451 | cmd_qtinit (packet); | |
3452 | return 1; | |
3453 | } | |
3454 | else if (strncmp ("QTDP:", packet, strlen ("QTDP:")) == 0) | |
3455 | { | |
3456 | cmd_qtdp (packet); | |
3457 | return 1; | |
3458 | } | |
3459 | else if (strncmp ("QTDPsrc:", packet, strlen ("QTDPsrc:")) == 0) | |
3460 | { | |
3461 | cmd_qtdpsrc (packet); | |
3462 | return 1; | |
3463 | } | |
3464 | else if (strncmp ("QTDV:", packet, strlen ("QTDV:")) == 0) | |
3465 | { | |
3466 | cmd_qtdv (packet); | |
3467 | return 1; | |
3468 | } | |
3469 | else if (strncmp ("QTro:", packet, strlen ("QTro:")) == 0) | |
3470 | { | |
3471 | cmd_qtro (packet); | |
3472 | return 1; | |
3473 | } | |
3474 | else if (strcmp ("QTStart", packet) == 0) | |
3475 | { | |
3476 | cmd_qtstart (packet); | |
3477 | return 1; | |
3478 | } | |
3479 | else if (strcmp ("QTStop", packet) == 0) | |
3480 | { | |
3481 | cmd_qtstop (packet); | |
3482 | return 1; | |
3483 | } | |
8336d594 PA |
3484 | else if (strncmp ("QTDisconnected:", packet, |
3485 | strlen ("QTDisconnected:")) == 0) | |
3486 | { | |
3487 | cmd_qtdisconnected (packet); | |
3488 | return 1; | |
3489 | } | |
219f2f23 PA |
3490 | else if (strncmp ("QTFrame:", packet, strlen ("QTFrame:")) == 0) |
3491 | { | |
3492 | cmd_qtframe (packet); | |
3493 | return 1; | |
3494 | } | |
3495 | else if (strncmp ("QTBuffer:", packet, strlen ("QTBuffer:")) == 0) | |
3496 | { | |
3497 | cmd_bigqtbuffer (packet); | |
3498 | return 1; | |
3499 | } | |
3500 | ||
3501 | return 0; | |
3502 | } | |
3503 | ||
3504 | int | |
3505 | handle_tracepoint_query (char *packet) | |
3506 | { | |
3507 | if (strcmp ("qTStatus", packet) == 0) | |
3508 | { | |
3509 | cmd_qtstatus (packet); | |
3510 | return 1; | |
3511 | } | |
3512 | else if (strcmp ("qTfP", packet) == 0) | |
3513 | { | |
3514 | cmd_qtfp (packet); | |
3515 | return 1; | |
3516 | } | |
3517 | else if (strcmp ("qTsP", packet) == 0) | |
3518 | { | |
3519 | cmd_qtsp (packet); | |
3520 | return 1; | |
3521 | } | |
3522 | else if (strcmp ("qTfV", packet) == 0) | |
3523 | { | |
3524 | cmd_qtfv (packet); | |
3525 | return 1; | |
3526 | } | |
3527 | else if (strcmp ("qTsV", packet) == 0) | |
3528 | { | |
3529 | cmd_qtsv (packet); | |
3530 | return 1; | |
3531 | } | |
3532 | else if (strncmp ("qTV:", packet, strlen ("qTV:")) == 0) | |
3533 | { | |
3534 | cmd_qtv (packet); | |
3535 | return 1; | |
3536 | } | |
3537 | else if (strncmp ("qTBuffer:", packet, strlen ("qTBuffer:")) == 0) | |
3538 | { | |
3539 | cmd_qtbuffer (packet); | |
3540 | return 1; | |
3541 | } | |
0fb4aa4b PA |
3542 | else if (strcmp ("qTfSTM", packet) == 0) |
3543 | { | |
3544 | cmd_qtfstm (packet); | |
3545 | return 1; | |
3546 | } | |
3547 | else if (strcmp ("qTsSTM", packet) == 0) | |
3548 | { | |
3549 | cmd_qtsstm (packet); | |
3550 | return 1; | |
3551 | } | |
3552 | else if (strncmp ("qTSTMat:", packet, strlen ("qTSTMat:")) == 0) | |
3553 | { | |
3554 | cmd_qtstmat (packet); | |
3555 | return 1; | |
3556 | } | |
219f2f23 PA |
3557 | |
3558 | return 0; | |
3559 | } | |
3560 | ||
fa593d66 PA |
3561 | #endif |
3562 | #ifndef IN_PROCESS_AGENT | |
3563 | ||
219f2f23 PA |
3564 | /* Call this when thread TINFO has hit the tracepoint defined by |
3565 | TP_NUMBER and TP_ADDRESS, and that tracepoint has a while-stepping | |
3566 | action. This adds a while-stepping collecting state item to the | |
3567 | threads' collecting state list, so that we can keep track of | |
3568 | multiple simultaneous while-stepping actions being collected by the | |
3569 | same thread. This can happen in cases like: | |
3570 | ||
3571 | ff0001 INSN1 <-- TP1, while-stepping 10 collect $regs | |
3572 | ff0002 INSN2 | |
3573 | ff0003 INSN3 <-- TP2, collect $regs | |
3574 | ff0004 INSN4 <-- TP3, while-stepping 10 collect $regs | |
3575 | ff0005 INSN5 | |
3576 | ||
3577 | Notice that when instruction INSN5 is reached, the while-stepping | |
3578 | actions of both TP1 and TP3 are still being collected, and that TP2 | |
3579 | had been collected meanwhile. The whole range of ff0001-ff0005 | |
3580 | should be single-stepped, due to at least TP1's while-stepping | |
3581 | action covering the whole range. */ | |
3582 | ||
3583 | static void | |
3584 | add_while_stepping_state (struct thread_info *tinfo, | |
3585 | int tp_number, CORE_ADDR tp_address) | |
3586 | { | |
3587 | struct wstep_state *wstep; | |
3588 | ||
3589 | wstep = xmalloc (sizeof (*wstep)); | |
3590 | wstep->next = tinfo->while_stepping; | |
3591 | ||
3592 | wstep->tp_number = tp_number; | |
3593 | wstep->tp_address = tp_address; | |
3594 | wstep->current_step = 0; | |
3595 | ||
3596 | tinfo->while_stepping = wstep; | |
3597 | } | |
3598 | ||
3599 | /* Release the while-stepping collecting state WSTEP. */ | |
3600 | ||
3601 | static void | |
3602 | release_while_stepping_state (struct wstep_state *wstep) | |
3603 | { | |
3604 | free (wstep); | |
3605 | } | |
3606 | ||
3607 | /* Release all while-stepping collecting states currently associated | |
3608 | with thread TINFO. */ | |
3609 | ||
3610 | void | |
3611 | release_while_stepping_state_list (struct thread_info *tinfo) | |
3612 | { | |
3613 | struct wstep_state *head; | |
3614 | ||
3615 | while (tinfo->while_stepping) | |
3616 | { | |
3617 | head = tinfo->while_stepping; | |
3618 | tinfo->while_stepping = head->next; | |
3619 | release_while_stepping_state (head); | |
3620 | } | |
3621 | } | |
3622 | ||
3623 | /* If TINFO was handling a 'while-stepping' action, the step has | |
3624 | finished, so collect any step data needed, and check if any more | |
3625 | steps are required. Return true if the thread was indeed | |
3626 | collecting tracepoint data, false otherwise. */ | |
3627 | ||
3628 | int | |
3629 | tracepoint_finished_step (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
3630 | { | |
3631 | struct tracepoint *tpoint; | |
3632 | struct wstep_state *wstep; | |
3633 | struct wstep_state **wstep_link; | |
3634 | struct trap_tracepoint_ctx ctx; | |
3635 | ||
fa593d66 PA |
3636 | /* Pull in fast tracepoint trace frames from the inferior lib buffer into |
3637 | our buffer. */ | |
3638 | if (in_process_agent_loaded ()) | |
3639 | upload_fast_traceframes (); | |
3640 | ||
219f2f23 PA |
3641 | /* Check if we were indeed collecting data for one of more |
3642 | tracepoints with a 'while-stepping' count. */ | |
3643 | if (tinfo->while_stepping == NULL) | |
3644 | return 0; | |
3645 | ||
3646 | if (!tracing) | |
3647 | { | |
3648 | /* We're not even tracing anymore. Stop this thread from | |
3649 | collecting. */ | |
3650 | release_while_stepping_state_list (tinfo); | |
3651 | ||
3652 | /* The thread had stopped due to a single-step request indeed | |
3653 | explained by a tracepoint. */ | |
3654 | return 1; | |
3655 | } | |
3656 | ||
3657 | wstep = tinfo->while_stepping; | |
3658 | wstep_link = &tinfo->while_stepping; | |
3659 | ||
3660 | trace_debug ("Thread %s finished a single-step for tracepoint %d at 0x%s", | |
3661 | target_pid_to_str (tinfo->entry.id), | |
3662 | wstep->tp_number, paddress (wstep->tp_address)); | |
3663 | ||
fa593d66 | 3664 | ctx.base.type = trap_tracepoint; |
219f2f23 PA |
3665 | ctx.regcache = get_thread_regcache (tinfo, 1); |
3666 | ||
3667 | while (wstep != NULL) | |
3668 | { | |
3669 | tpoint = find_tracepoint (wstep->tp_number, wstep->tp_address); | |
3670 | if (tpoint == NULL) | |
3671 | { | |
3672 | trace_debug ("NO TRACEPOINT %d at 0x%s FOR THREAD %s!", | |
3673 | wstep->tp_number, paddress (wstep->tp_address), | |
3674 | target_pid_to_str (tinfo->entry.id)); | |
3675 | ||
3676 | /* Unlink. */ | |
3677 | *wstep_link = wstep->next; | |
3678 | release_while_stepping_state (wstep); | |
3679 | continue; | |
3680 | } | |
3681 | ||
3682 | /* We've just finished one step. */ | |
3683 | ++wstep->current_step; | |
3684 | ||
3685 | /* Collect data. */ | |
3686 | collect_data_at_step ((struct tracepoint_hit_ctx *) &ctx, | |
3687 | stop_pc, tpoint, wstep->current_step); | |
3688 | ||
3689 | if (wstep->current_step >= tpoint->step_count) | |
3690 | { | |
3691 | /* The requested numbers of steps have occurred. */ | |
3692 | trace_debug ("Thread %s done stepping for tracepoint %d at 0x%s", | |
3693 | target_pid_to_str (tinfo->entry.id), | |
3694 | wstep->tp_number, paddress (wstep->tp_address)); | |
3695 | ||
3696 | /* Unlink the wstep. */ | |
3697 | *wstep_link = wstep->next; | |
3698 | release_while_stepping_state (wstep); | |
3699 | wstep = *wstep_link; | |
3700 | ||
3701 | /* Only check the hit count now, which ensure that we do all | |
3702 | our stepping before stopping the run. */ | |
3703 | if (tpoint->pass_count > 0 | |
3704 | && tpoint->hit_count >= tpoint->pass_count | |
3705 | && stopping_tracepoint == NULL) | |
3706 | stopping_tracepoint = tpoint; | |
3707 | } | |
3708 | else | |
3709 | { | |
3710 | /* Keep single-stepping until the requested numbers of steps | |
3711 | have occurred. */ | |
3712 | wstep_link = &wstep->next; | |
3713 | wstep = *wstep_link; | |
3714 | } | |
3715 | ||
3716 | if (stopping_tracepoint | |
3717 | || trace_buffer_is_full | |
3718 | || expr_eval_result != expr_eval_no_error) | |
3719 | { | |
3720 | stop_tracing (); | |
3721 | break; | |
3722 | } | |
3723 | } | |
3724 | ||
3725 | return 1; | |
3726 | } | |
3727 | ||
fa593d66 PA |
3728 | /* Handle any internal tracing control breakpoint hits. That means, |
3729 | pull traceframes from the IPA to our buffer, and syncing both | |
3730 | tracing agents when the IPA's tracing stops for some reason. */ | |
3731 | ||
3732 | int | |
3733 | handle_tracepoint_bkpts (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
3734 | { | |
3735 | /* Pull in fast tracepoint trace frames from the inferior in-process | |
3736 | agent's buffer into our buffer. */ | |
3737 | ||
3738 | if (!in_process_agent_loaded ()) | |
3739 | return 0; | |
3740 | ||
3741 | upload_fast_traceframes (); | |
3742 | ||
3743 | /* Check if the in-process agent had decided we should stop | |
3744 | tracing. */ | |
3745 | if (stop_pc == ipa_sym_addrs.addr_stop_tracing) | |
3746 | { | |
3747 | int ipa_trace_buffer_is_full; | |
3748 | CORE_ADDR ipa_stopping_tracepoint; | |
3749 | int ipa_expr_eval_result; | |
3750 | CORE_ADDR ipa_error_tracepoint; | |
3751 | ||
3752 | trace_debug ("lib stopped at stop_tracing"); | |
3753 | ||
3754 | read_inferior_integer (ipa_sym_addrs.addr_trace_buffer_is_full, | |
3755 | &ipa_trace_buffer_is_full); | |
3756 | ||
3757 | read_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, | |
3758 | &ipa_stopping_tracepoint); | |
3759 | write_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, 0); | |
3760 | ||
3761 | read_inferior_data_pointer (ipa_sym_addrs.addr_error_tracepoint, | |
3762 | &ipa_error_tracepoint); | |
3763 | write_inferior_data_pointer (ipa_sym_addrs.addr_error_tracepoint, 0); | |
3764 | ||
3765 | read_inferior_integer (ipa_sym_addrs.addr_expr_eval_result, | |
3766 | &ipa_expr_eval_result); | |
3767 | write_inferior_integer (ipa_sym_addrs.addr_expr_eval_result, 0); | |
3768 | ||
3769 | trace_debug ("lib: trace_buffer_is_full: %d, " | |
3770 | "stopping_tracepoint: %s, " | |
3771 | "ipa_expr_eval_result: %d, " | |
3772 | "error_tracepoint: %s, ", | |
3773 | ipa_trace_buffer_is_full, | |
3774 | paddress (ipa_stopping_tracepoint), | |
3775 | ipa_expr_eval_result, | |
3776 | paddress (ipa_error_tracepoint)); | |
3777 | ||
3778 | if (debug_threads) | |
3779 | { | |
3780 | if (ipa_trace_buffer_is_full) | |
3781 | trace_debug ("lib stopped due to full buffer."); | |
3782 | if (ipa_stopping_tracepoint) | |
3783 | trace_debug ("lib stopped due to tpoint"); | |
3784 | if (ipa_stopping_tracepoint) | |
3785 | trace_debug ("lib stopped due to error"); | |
3786 | } | |
3787 | ||
3788 | if (ipa_stopping_tracepoint != 0) | |
3789 | { | |
3790 | stopping_tracepoint | |
3791 | = fast_tracepoint_from_ipa_tpoint_address (ipa_stopping_tracepoint); | |
3792 | } | |
3793 | else if (ipa_expr_eval_result != expr_eval_no_error) | |
3794 | { | |
3795 | expr_eval_result = ipa_expr_eval_result; | |
3796 | error_tracepoint | |
3797 | = fast_tracepoint_from_ipa_tpoint_address (ipa_error_tracepoint); | |
3798 | } | |
3799 | stop_tracing (); | |
3800 | return 1; | |
3801 | } | |
3802 | else if (stop_pc == ipa_sym_addrs.addr_flush_trace_buffer) | |
3803 | { | |
3804 | trace_debug ("lib stopped at flush_trace_buffer"); | |
3805 | return 1; | |
3806 | } | |
3807 | ||
3808 | return 0; | |
3809 | } | |
3810 | ||
219f2f23 PA |
3811 | /* Return true if TINFO just hit a tracepoint. Collect data if |
3812 | so. */ | |
3813 | ||
3814 | int | |
3815 | tracepoint_was_hit (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
3816 | { | |
3817 | struct tracepoint *tpoint; | |
3818 | int ret = 0; | |
3819 | struct trap_tracepoint_ctx ctx; | |
3820 | ||
3821 | /* Not tracing, don't handle. */ | |
3822 | if (!tracing) | |
3823 | return 0; | |
3824 | ||
fa593d66 | 3825 | ctx.base.type = trap_tracepoint; |
219f2f23 PA |
3826 | ctx.regcache = get_thread_regcache (tinfo, 1); |
3827 | ||
3828 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
3829 | { | |
fa593d66 PA |
3830 | /* Note that we collect fast tracepoints here as well. We'll |
3831 | step over the fast tracepoint jump later, which avoids the | |
3832 | double collect. */ | |
219f2f23 PA |
3833 | if (tpoint->enabled && stop_pc == tpoint->address) |
3834 | { | |
3835 | trace_debug ("Thread %s at address of tracepoint %d at 0x%s", | |
3836 | target_pid_to_str (tinfo->entry.id), | |
3837 | tpoint->number, paddress (tpoint->address)); | |
3838 | ||
3839 | /* Test the condition if present, and collect if true. */ | |
3840 | if (!tpoint->cond | |
3841 | || (condition_true_at_tracepoint | |
3842 | ((struct tracepoint_hit_ctx *) &ctx, tpoint))) | |
3843 | collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
3844 | stop_pc, tpoint); | |
3845 | ||
3846 | if (stopping_tracepoint | |
3847 | || trace_buffer_is_full | |
3848 | || expr_eval_result != expr_eval_no_error) | |
3849 | { | |
3850 | stop_tracing (); | |
3851 | } | |
3852 | /* If the tracepoint had a 'while-stepping' action, then set | |
3853 | the thread to collect this tracepoint on the following | |
3854 | single-steps. */ | |
3855 | else if (tpoint->step_count > 0) | |
3856 | { | |
3857 | add_while_stepping_state (tinfo, | |
3858 | tpoint->number, tpoint->address); | |
3859 | } | |
3860 | ||
3861 | ret = 1; | |
3862 | } | |
3863 | } | |
3864 | ||
3865 | return ret; | |
3866 | } | |
3867 | ||
fa593d66 PA |
3868 | #endif |
3869 | ||
0fb4aa4b PA |
3870 | #if defined IN_PROCESS_AGENT && defined HAVE_UST |
3871 | struct ust_marker_data; | |
3872 | static void collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
3873 | CORE_ADDR stop_pc, | |
3874 | struct tracepoint *tpoint, | |
3875 | struct traceframe *tframe); | |
3876 | #endif | |
3877 | ||
219f2f23 PA |
3878 | /* Create a trace frame for the hit of the given tracepoint in the |
3879 | given thread. */ | |
3880 | ||
3881 | static void | |
3882 | collect_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, CORE_ADDR stop_pc, | |
3883 | struct tracepoint *tpoint) | |
3884 | { | |
3885 | struct traceframe *tframe; | |
3886 | int acti; | |
3887 | ||
3888 | /* Only count it as a hit when we actually collect data. */ | |
3889 | tpoint->hit_count++; | |
3890 | ||
3891 | /* If we've exceeded a defined pass count, record the event for | |
3892 | later, and finish the collection for this hit. This test is only | |
3893 | for nonstepping tracepoints, stepping tracepoints test at the end | |
3894 | of their while-stepping loop. */ | |
3895 | if (tpoint->pass_count > 0 | |
3896 | && tpoint->hit_count >= tpoint->pass_count | |
3897 | && tpoint->step_count == 0 | |
3898 | && stopping_tracepoint == NULL) | |
3899 | stopping_tracepoint = tpoint; | |
3900 | ||
3901 | trace_debug ("Making new traceframe for tracepoint %d at 0x%s, hit %ld", | |
3902 | tpoint->number, paddress (tpoint->address), tpoint->hit_count); | |
3903 | ||
3904 | tframe = add_traceframe (tpoint); | |
3905 | ||
3906 | if (tframe) | |
3907 | { | |
3908 | for (acti = 0; acti < tpoint->numactions; ++acti) | |
3909 | { | |
fa593d66 | 3910 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
3911 | trace_debug ("Tracepoint %d at 0x%s about to do action '%s'", |
3912 | tpoint->number, paddress (tpoint->address), | |
3913 | tpoint->actions_str[acti]); | |
fa593d66 | 3914 | #endif |
219f2f23 PA |
3915 | |
3916 | do_action_at_tracepoint (ctx, stop_pc, tpoint, tframe, | |
3917 | tpoint->actions[acti]); | |
3918 | } | |
3919 | ||
3920 | finish_traceframe (tframe); | |
3921 | } | |
3922 | ||
3923 | if (tframe == NULL && tracing) | |
3924 | trace_buffer_is_full = 1; | |
3925 | } | |
3926 | ||
fa593d66 PA |
3927 | #ifndef IN_PROCESS_AGENT |
3928 | ||
219f2f23 PA |
3929 | static void |
3930 | collect_data_at_step (struct tracepoint_hit_ctx *ctx, | |
3931 | CORE_ADDR stop_pc, | |
3932 | struct tracepoint *tpoint, int current_step) | |
3933 | { | |
3934 | struct traceframe *tframe; | |
3935 | int acti; | |
3936 | ||
3937 | trace_debug ("Making new step traceframe for " | |
3938 | "tracepoint %d at 0x%s, step %d of %ld, hit %ld", | |
3939 | tpoint->number, paddress (tpoint->address), | |
3940 | current_step, tpoint->step_count, | |
3941 | tpoint->hit_count); | |
3942 | ||
3943 | tframe = add_traceframe (tpoint); | |
3944 | ||
3945 | if (tframe) | |
3946 | { | |
3947 | for (acti = 0; acti < tpoint->num_step_actions; ++acti) | |
3948 | { | |
3949 | trace_debug ("Tracepoint %d at 0x%s about to do step action '%s'", | |
3950 | tpoint->number, paddress (tpoint->address), | |
3951 | tpoint->step_actions_str[acti]); | |
3952 | ||
3953 | do_action_at_tracepoint (ctx, stop_pc, tpoint, tframe, | |
3954 | tpoint->step_actions[acti]); | |
3955 | } | |
3956 | ||
3957 | finish_traceframe (tframe); | |
3958 | } | |
3959 | ||
3960 | if (tframe == NULL && tracing) | |
3961 | trace_buffer_is_full = 1; | |
3962 | } | |
3963 | ||
fa593d66 PA |
3964 | #endif |
3965 | ||
219f2f23 PA |
3966 | static struct regcache * |
3967 | get_context_regcache (struct tracepoint_hit_ctx *ctx) | |
3968 | { | |
fa593d66 PA |
3969 | struct regcache *regcache = NULL; |
3970 | ||
3971 | #ifdef IN_PROCESS_AGENT | |
3972 | if (ctx->type == fast_tracepoint) | |
3973 | { | |
3974 | struct fast_tracepoint_ctx *fctx = (struct fast_tracepoint_ctx *) ctx; | |
3975 | if (!fctx->regcache_initted) | |
3976 | { | |
3977 | fctx->regcache_initted = 1; | |
3978 | init_register_cache (&fctx->regcache, fctx->regspace); | |
3979 | supply_regblock (&fctx->regcache, NULL); | |
3980 | supply_fast_tracepoint_registers (&fctx->regcache, fctx->regs); | |
3981 | } | |
3982 | regcache = &fctx->regcache; | |
3983 | } | |
0fb4aa4b PA |
3984 | #ifdef HAVE_UST |
3985 | if (ctx->type == static_tracepoint) | |
3986 | { | |
493e2a69 MS |
3987 | struct static_tracepoint_ctx *sctx |
3988 | = (struct static_tracepoint_ctx *) ctx; | |
3989 | ||
0fb4aa4b PA |
3990 | if (!sctx->regcache_initted) |
3991 | { | |
3992 | sctx->regcache_initted = 1; | |
3993 | init_register_cache (&sctx->regcache, sctx->regspace); | |
3994 | supply_regblock (&sctx->regcache, NULL); | |
3995 | /* Pass down the tracepoint address, because REGS doesn't | |
3996 | include the PC, but we know what it must have been. */ | |
3997 | supply_static_tracepoint_registers (&sctx->regcache, | |
3998 | (const unsigned char *) | |
3999 | sctx->regs, | |
4000 | sctx->tpoint->address); | |
4001 | } | |
4002 | regcache = &sctx->regcache; | |
4003 | } | |
4004 | #endif | |
fa593d66 PA |
4005 | #else |
4006 | if (ctx->type == trap_tracepoint) | |
4007 | { | |
4008 | struct trap_tracepoint_ctx *tctx = (struct trap_tracepoint_ctx *) ctx; | |
4009 | regcache = tctx->regcache; | |
4010 | } | |
4011 | #endif | |
219f2f23 PA |
4012 | |
4013 | gdb_assert (regcache != NULL); | |
4014 | ||
4015 | return regcache; | |
4016 | } | |
4017 | ||
4018 | static void | |
4019 | do_action_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
4020 | CORE_ADDR stop_pc, | |
4021 | struct tracepoint *tpoint, | |
4022 | struct traceframe *tframe, | |
4023 | struct tracepoint_action *taction) | |
4024 | { | |
4025 | enum eval_result_type err; | |
4026 | ||
4027 | switch (taction->type) | |
4028 | { | |
4029 | case 'M': | |
4030 | { | |
4031 | struct collect_memory_action *maction; | |
4032 | ||
4033 | maction = (struct collect_memory_action *) taction; | |
4034 | ||
4035 | trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)", | |
4036 | pulongest (maction->len), | |
4037 | paddress (maction->addr), maction->basereg); | |
4038 | /* (should use basereg) */ | |
4039 | agent_mem_read (tframe, NULL, | |
4040 | (CORE_ADDR) maction->addr, maction->len); | |
4041 | break; | |
4042 | } | |
4043 | case 'R': | |
4044 | { | |
219f2f23 PA |
4045 | unsigned char *regspace; |
4046 | struct regcache tregcache; | |
4047 | struct regcache *context_regcache; | |
4048 | ||
219f2f23 PA |
4049 | |
4050 | trace_debug ("Want to collect registers"); | |
4051 | ||
4052 | /* Collect all registers for now. */ | |
4053 | regspace = add_traceframe_block (tframe, | |
4054 | 1 + register_cache_size ()); | |
4055 | if (regspace == NULL) | |
4056 | { | |
4057 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
4058 | break; | |
4059 | } | |
4060 | /* Identify a register block. */ | |
4061 | *regspace = 'R'; | |
4062 | ||
4063 | context_regcache = get_context_regcache (ctx); | |
4064 | ||
4065 | /* Wrap the regblock in a register cache (in the stack, we | |
4066 | don't want to malloc here). */ | |
4067 | init_register_cache (&tregcache, regspace + 1); | |
4068 | ||
4069 | /* Copy the register data to the regblock. */ | |
4070 | regcache_cpy (&tregcache, context_regcache); | |
4071 | ||
fa593d66 | 4072 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
4073 | /* On some platforms, trap-based tracepoints will have the PC |
4074 | pointing to the next instruction after the trap, but we | |
4075 | don't want the user or GDB trying to guess whether the | |
4076 | saved PC needs adjusting; so always record the adjusted | |
4077 | stop_pc. Note that we can't use tpoint->address instead, | |
fa593d66 PA |
4078 | since it will be wrong for while-stepping actions. This |
4079 | adjustment is a nop for fast tracepoints collected from the | |
4080 | in-process lib (but not if GDBserver is collecting one | |
4081 | preemptively), since the PC had already been adjusted to | |
4082 | contain the tracepoint's address by the jump pad. */ | |
219f2f23 PA |
4083 | trace_debug ("Storing stop pc (0x%s) in regblock", |
4084 | paddress (tpoint->address)); | |
4085 | ||
4086 | /* This changes the regblock, not the thread's | |
4087 | regcache. */ | |
4088 | regcache_write_pc (&tregcache, stop_pc); | |
fa593d66 | 4089 | #endif |
219f2f23 PA |
4090 | } |
4091 | break; | |
4092 | case 'X': | |
4093 | { | |
4094 | struct eval_expr_action *eaction; | |
4095 | ||
4096 | eaction = (struct eval_expr_action *) taction; | |
4097 | ||
4098 | trace_debug ("Want to evaluate expression"); | |
4099 | ||
4100 | err = eval_agent_expr (ctx, tframe, eaction->expr, NULL); | |
4101 | ||
4102 | if (err != expr_eval_no_error) | |
4103 | { | |
4104 | record_tracepoint_error (tpoint, "action expression", err); | |
4105 | return; | |
4106 | } | |
4107 | } | |
4108 | break; | |
0fb4aa4b PA |
4109 | case 'L': |
4110 | { | |
4111 | #if defined IN_PROCESS_AGENT && defined HAVE_UST | |
4112 | trace_debug ("Want to collect static trace data"); | |
4113 | collect_ust_data_at_tracepoint (ctx, stop_pc, | |
4114 | tpoint, tframe); | |
4115 | #else | |
4116 | trace_debug ("warning: collecting static trace data, " | |
4117 | "but static tracepoints are not supported"); | |
4118 | #endif | |
4119 | } | |
4120 | break; | |
219f2f23 PA |
4121 | default: |
4122 | trace_debug ("unknown trace action '%c', ignoring", taction->type); | |
4123 | break; | |
4124 | } | |
4125 | } | |
4126 | ||
4127 | static int | |
4128 | condition_true_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
4129 | struct tracepoint *tpoint) | |
4130 | { | |
4131 | ULONGEST value = 0; | |
4132 | enum eval_result_type err; | |
4133 | ||
c6beb2cb PA |
4134 | /* Presently, gdbserver doesn't run compiled conditions, only the |
4135 | IPA does. If the program stops at a fast tracepoint's address | |
4136 | (e.g., due to a breakpoint, trap tracepoint, or stepping), | |
4137 | gdbserver preemptively collect the fast tracepoint. Later, on | |
4138 | resume, gdbserver steps over the fast tracepoint like it steps | |
4139 | over breakpoints, so that the IPA doesn't see that fast | |
4140 | tracepoint. This avoids double collects of fast tracepoints in | |
4141 | that stopping scenario. Having gdbserver itself handle the fast | |
4142 | tracepoint gives the user a consistent view of when fast or trap | |
4143 | tracepoints are collected, compared to an alternative where only | |
4144 | trap tracepoints are collected on stop, and fast tracepoints on | |
4145 | resume. When a fast tracepoint is being processed by gdbserver, | |
4146 | it is always the non-compiled condition expression that is | |
4147 | used. */ | |
4148 | #ifdef IN_PROCESS_AGENT | |
6a271cae PA |
4149 | if (tpoint->compiled_cond) |
4150 | err = ((condfn) (uintptr_t) (tpoint->compiled_cond)) (ctx, &value); | |
4151 | else | |
c6beb2cb | 4152 | #endif |
6a271cae | 4153 | err = eval_agent_expr (ctx, NULL, tpoint->cond, &value); |
219f2f23 PA |
4154 | |
4155 | if (err != expr_eval_no_error) | |
4156 | { | |
4157 | record_tracepoint_error (tpoint, "condition", err); | |
4158 | /* The error case must return false. */ | |
4159 | return 0; | |
4160 | } | |
4161 | ||
4162 | trace_debug ("Tracepoint %d at 0x%s condition evals to %s", | |
4163 | tpoint->number, paddress (tpoint->address), | |
4164 | pulongest (value)); | |
4165 | return (value ? 1 : 0); | |
4166 | } | |
4167 | ||
fa593d66 PA |
4168 | #ifndef IN_PROCESS_AGENT |
4169 | ||
219f2f23 PA |
4170 | /* The packet form of an agent expression consists of an 'X', number |
4171 | of bytes in expression, a comma, and then the bytes. */ | |
4172 | ||
4173 | static struct agent_expr * | |
4174 | parse_agent_expr (char **actparm) | |
4175 | { | |
4176 | char *act = *actparm; | |
4177 | ULONGEST xlen; | |
4178 | struct agent_expr *aexpr; | |
4179 | ||
4180 | ++act; /* skip the X */ | |
4181 | act = unpack_varlen_hex (act, &xlen); | |
4182 | ++act; /* skip a comma */ | |
4183 | aexpr = xmalloc (sizeof (struct agent_expr)); | |
4184 | aexpr->length = xlen; | |
4185 | aexpr->bytes = xmalloc (xlen); | |
4186 | convert_ascii_to_int (act, aexpr->bytes, xlen); | |
4187 | *actparm = act + (xlen * 2); | |
4188 | return aexpr; | |
4189 | } | |
4190 | ||
4191 | /* Convert the bytes of an agent expression back into hex digits, so | |
4192 | they can be printed or uploaded. This allocates the buffer, | |
4193 | callers should free when they are done with it. */ | |
4194 | ||
4195 | static char * | |
4196 | unparse_agent_expr (struct agent_expr *aexpr) | |
4197 | { | |
4198 | char *rslt; | |
4199 | ||
4200 | rslt = xmalloc (2 * aexpr->length + 1); | |
4201 | convert_int_to_ascii (aexpr->bytes, rslt, aexpr->length); | |
4202 | return rslt; | |
4203 | } | |
4204 | ||
fa593d66 PA |
4205 | #endif |
4206 | ||
94d5e490 TT |
4207 | /* A wrapper for gdb_agent_op_names that does some bounds-checking. */ |
4208 | ||
4209 | static const char * | |
4210 | gdb_agent_op_name (int op) | |
4211 | { | |
4212 | if (op < 0 || op >= gdb_agent_op_last || gdb_agent_op_names[op] == NULL) | |
4213 | return "?undef?"; | |
4214 | return gdb_agent_op_names[op]; | |
4215 | } | |
4216 | ||
219f2f23 PA |
4217 | /* The agent expression evaluator, as specified by the GDB docs. It |
4218 | returns 0 if everything went OK, and a nonzero error code | |
4219 | otherwise. */ | |
4220 | ||
4221 | static enum eval_result_type | |
4222 | eval_agent_expr (struct tracepoint_hit_ctx *ctx, | |
4223 | struct traceframe *tframe, | |
4224 | struct agent_expr *aexpr, | |
4225 | ULONGEST *rslt) | |
4226 | { | |
4227 | int pc = 0; | |
4228 | #define STACK_MAX 100 | |
4229 | ULONGEST stack[STACK_MAX], top; | |
4230 | int sp = 0; | |
4231 | unsigned char op; | |
4232 | int arg; | |
4233 | ||
4234 | /* This union is a convenient way to convert representations. For | |
4235 | now, assume a standard architecture where the hardware integer | |
4236 | types have 8, 16, 32, 64 bit types. A more robust solution would | |
4237 | be to import stdint.h from gnulib. */ | |
4238 | union | |
4239 | { | |
4240 | union | |
4241 | { | |
4242 | unsigned char bytes[1]; | |
4243 | unsigned char val; | |
4244 | } u8; | |
4245 | union | |
4246 | { | |
4247 | unsigned char bytes[2]; | |
4248 | unsigned short val; | |
4249 | } u16; | |
4250 | union | |
4251 | { | |
4252 | unsigned char bytes[4]; | |
4253 | unsigned int val; | |
4254 | } u32; | |
4255 | union | |
4256 | { | |
4257 | unsigned char bytes[8]; | |
4258 | ULONGEST val; | |
4259 | } u64; | |
4260 | } cnv; | |
4261 | ||
4262 | if (aexpr->length == 0) | |
4263 | { | |
4264 | trace_debug ("empty agent expression"); | |
4265 | return expr_eval_empty_expression; | |
4266 | } | |
4267 | ||
4268 | /* Cache the stack top in its own variable. Much of the time we can | |
4269 | operate on this variable, rather than dinking with the stack. It | |
4270 | needs to be copied to the stack when sp changes. */ | |
4271 | top = 0; | |
4272 | ||
4273 | while (1) | |
4274 | { | |
4275 | op = aexpr->bytes[pc++]; | |
4276 | ||
4277 | trace_debug ("About to interpret byte 0x%x", op); | |
4278 | ||
4279 | switch (op) | |
4280 | { | |
4281 | case gdb_agent_op_add: | |
4282 | top += stack[--sp]; | |
4283 | break; | |
4284 | ||
4285 | case gdb_agent_op_sub: | |
4286 | top = stack[--sp] - top; | |
4287 | break; | |
4288 | ||
4289 | case gdb_agent_op_mul: | |
4290 | top *= stack[--sp]; | |
4291 | break; | |
4292 | ||
4293 | case gdb_agent_op_div_signed: | |
4294 | if (top == 0) | |
4295 | { | |
4296 | trace_debug ("Attempted to divide by zero"); | |
4297 | return expr_eval_divide_by_zero; | |
4298 | } | |
4299 | top = ((LONGEST) stack[--sp]) / ((LONGEST) top); | |
4300 | break; | |
4301 | ||
4302 | case gdb_agent_op_div_unsigned: | |
4303 | if (top == 0) | |
4304 | { | |
4305 | trace_debug ("Attempted to divide by zero"); | |
4306 | return expr_eval_divide_by_zero; | |
4307 | } | |
4308 | top = stack[--sp] / top; | |
4309 | break; | |
4310 | ||
4311 | case gdb_agent_op_rem_signed: | |
4312 | if (top == 0) | |
4313 | { | |
4314 | trace_debug ("Attempted to divide by zero"); | |
4315 | return expr_eval_divide_by_zero; | |
4316 | } | |
4317 | top = ((LONGEST) stack[--sp]) % ((LONGEST) top); | |
4318 | break; | |
4319 | ||
4320 | case gdb_agent_op_rem_unsigned: | |
4321 | if (top == 0) | |
4322 | { | |
4323 | trace_debug ("Attempted to divide by zero"); | |
4324 | return expr_eval_divide_by_zero; | |
4325 | } | |
4326 | top = stack[--sp] % top; | |
4327 | break; | |
4328 | ||
4329 | case gdb_agent_op_lsh: | |
4330 | top = stack[--sp] << top; | |
4331 | break; | |
4332 | ||
4333 | case gdb_agent_op_rsh_signed: | |
4334 | top = ((LONGEST) stack[--sp]) >> top; | |
4335 | break; | |
4336 | ||
4337 | case gdb_agent_op_rsh_unsigned: | |
4338 | top = stack[--sp] >> top; | |
4339 | break; | |
4340 | ||
4341 | case gdb_agent_op_trace: | |
4342 | agent_mem_read (tframe, | |
4343 | NULL, (CORE_ADDR) stack[--sp], (ULONGEST) top); | |
4344 | if (--sp >= 0) | |
4345 | top = stack[sp]; | |
4346 | break; | |
4347 | ||
4348 | case gdb_agent_op_trace_quick: | |
4349 | arg = aexpr->bytes[pc++]; | |
4350 | agent_mem_read (tframe, NULL, (CORE_ADDR) top, (ULONGEST) arg); | |
4351 | break; | |
4352 | ||
4353 | case gdb_agent_op_log_not: | |
4354 | top = !top; | |
4355 | break; | |
4356 | ||
4357 | case gdb_agent_op_bit_and: | |
4358 | top &= stack[--sp]; | |
4359 | break; | |
4360 | ||
4361 | case gdb_agent_op_bit_or: | |
4362 | top |= stack[--sp]; | |
4363 | break; | |
4364 | ||
4365 | case gdb_agent_op_bit_xor: | |
4366 | top ^= stack[--sp]; | |
4367 | break; | |
4368 | ||
4369 | case gdb_agent_op_bit_not: | |
4370 | top = ~top; | |
4371 | break; | |
4372 | ||
4373 | case gdb_agent_op_equal: | |
4374 | top = (stack[--sp] == top); | |
4375 | break; | |
4376 | ||
4377 | case gdb_agent_op_less_signed: | |
4378 | top = (((LONGEST) stack[--sp]) < ((LONGEST) top)); | |
4379 | break; | |
4380 | ||
4381 | case gdb_agent_op_less_unsigned: | |
4382 | top = (stack[--sp] < top); | |
4383 | break; | |
4384 | ||
4385 | case gdb_agent_op_ext: | |
4386 | arg = aexpr->bytes[pc++]; | |
4387 | if (arg < (sizeof (LONGEST) * 8)) | |
4388 | { | |
4389 | LONGEST mask = 1 << (arg - 1); | |
4390 | top &= ((LONGEST) 1 << arg) - 1; | |
4391 | top = (top ^ mask) - mask; | |
4392 | } | |
4393 | break; | |
4394 | ||
4395 | case gdb_agent_op_ref8: | |
4396 | agent_mem_read (tframe, cnv.u8.bytes, (CORE_ADDR) top, 1); | |
4397 | top = cnv.u8.val; | |
4398 | break; | |
4399 | ||
4400 | case gdb_agent_op_ref16: | |
4401 | agent_mem_read (tframe, cnv.u16.bytes, (CORE_ADDR) top, 2); | |
4402 | top = cnv.u16.val; | |
4403 | break; | |
4404 | ||
4405 | case gdb_agent_op_ref32: | |
4406 | agent_mem_read (tframe, cnv.u32.bytes, (CORE_ADDR) top, 4); | |
4407 | top = cnv.u32.val; | |
4408 | break; | |
4409 | ||
4410 | case gdb_agent_op_ref64: | |
4411 | agent_mem_read (tframe, cnv.u64.bytes, (CORE_ADDR) top, 8); | |
4412 | top = cnv.u64.val; | |
4413 | break; | |
4414 | ||
4415 | case gdb_agent_op_if_goto: | |
4416 | if (top) | |
4417 | pc = (aexpr->bytes[pc] << 8) + (aexpr->bytes[pc + 1]); | |
4418 | else | |
4419 | pc += 2; | |
4420 | if (--sp >= 0) | |
4421 | top = stack[sp]; | |
4422 | break; | |
4423 | ||
4424 | case gdb_agent_op_goto: | |
4425 | pc = (aexpr->bytes[pc] << 8) + (aexpr->bytes[pc + 1]); | |
4426 | break; | |
4427 | ||
4428 | case gdb_agent_op_const8: | |
4429 | /* Flush the cached stack top. */ | |
4430 | stack[sp++] = top; | |
4431 | top = aexpr->bytes[pc++]; | |
4432 | break; | |
4433 | ||
4434 | case gdb_agent_op_const16: | |
4435 | /* Flush the cached stack top. */ | |
4436 | stack[sp++] = top; | |
4437 | top = aexpr->bytes[pc++]; | |
4438 | top = (top << 8) + aexpr->bytes[pc++]; | |
4439 | break; | |
4440 | ||
4441 | case gdb_agent_op_const32: | |
4442 | /* Flush the cached stack top. */ | |
4443 | stack[sp++] = top; | |
4444 | top = aexpr->bytes[pc++]; | |
4445 | top = (top << 8) + aexpr->bytes[pc++]; | |
4446 | top = (top << 8) + aexpr->bytes[pc++]; | |
4447 | top = (top << 8) + aexpr->bytes[pc++]; | |
4448 | break; | |
4449 | ||
4450 | case gdb_agent_op_const64: | |
4451 | /* Flush the cached stack top. */ | |
4452 | stack[sp++] = top; | |
4453 | top = aexpr->bytes[pc++]; | |
4454 | top = (top << 8) + aexpr->bytes[pc++]; | |
4455 | top = (top << 8) + aexpr->bytes[pc++]; | |
4456 | top = (top << 8) + aexpr->bytes[pc++]; | |
4457 | top = (top << 8) + aexpr->bytes[pc++]; | |
4458 | top = (top << 8) + aexpr->bytes[pc++]; | |
4459 | top = (top << 8) + aexpr->bytes[pc++]; | |
4460 | top = (top << 8) + aexpr->bytes[pc++]; | |
4461 | break; | |
4462 | ||
4463 | case gdb_agent_op_reg: | |
4464 | /* Flush the cached stack top. */ | |
4465 | stack[sp++] = top; | |
4466 | arg = aexpr->bytes[pc++]; | |
4467 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
4468 | { | |
4469 | int regnum = arg; | |
4470 | struct regcache *regcache; | |
4471 | ||
4472 | regcache = get_context_regcache (ctx); | |
4473 | ||
4474 | switch (register_size (regnum)) | |
4475 | { | |
4476 | case 8: | |
4477 | collect_register (regcache, regnum, cnv.u64.bytes); | |
4478 | top = cnv.u64.val; | |
4479 | break; | |
4480 | case 4: | |
4481 | collect_register (regcache, regnum, cnv.u32.bytes); | |
4482 | top = cnv.u32.val; | |
4483 | break; | |
4484 | case 2: | |
4485 | collect_register (regcache, regnum, cnv.u16.bytes); | |
4486 | top = cnv.u16.val; | |
4487 | break; | |
4488 | case 1: | |
4489 | collect_register (regcache, regnum, cnv.u8.bytes); | |
4490 | top = cnv.u8.val; | |
4491 | break; | |
4492 | default: | |
4493 | internal_error (__FILE__, __LINE__, | |
4494 | "unhandled register size"); | |
4495 | } | |
4496 | } | |
4497 | break; | |
4498 | ||
4499 | case gdb_agent_op_end: | |
4500 | trace_debug ("At end of expression, sp=%d, stack top cache=0x%s", | |
4501 | sp, pulongest (top)); | |
4502 | if (rslt) | |
4503 | { | |
4504 | if (sp <= 0) | |
4505 | { | |
4506 | /* This should be an error */ | |
4507 | trace_debug ("Stack is empty, nothing to return"); | |
4508 | return expr_eval_empty_stack; | |
4509 | } | |
4510 | *rslt = top; | |
4511 | } | |
4512 | return expr_eval_no_error; | |
4513 | ||
4514 | case gdb_agent_op_dup: | |
4515 | stack[sp++] = top; | |
4516 | break; | |
4517 | ||
4518 | case gdb_agent_op_pop: | |
4519 | if (--sp >= 0) | |
4520 | top = stack[sp]; | |
4521 | break; | |
4522 | ||
c7f96d2b TT |
4523 | case gdb_agent_op_pick: |
4524 | arg = aexpr->bytes[pc++]; | |
4525 | stack[sp] = top; | |
4526 | top = stack[sp - arg]; | |
4527 | ++sp; | |
4528 | break; | |
4529 | ||
4530 | case gdb_agent_op_rot: | |
4531 | { | |
4532 | ULONGEST tem = stack[sp - 1]; | |
4533 | ||
4534 | stack[sp - 1] = stack[sp - 2]; | |
4535 | stack[sp - 2] = top; | |
4536 | top = tem; | |
4537 | } | |
4538 | break; | |
4539 | ||
219f2f23 PA |
4540 | case gdb_agent_op_zero_ext: |
4541 | arg = aexpr->bytes[pc++]; | |
4542 | if (arg < (sizeof (LONGEST) * 8)) | |
4543 | top &= ((LONGEST) 1 << arg) - 1; | |
4544 | break; | |
4545 | ||
4546 | case gdb_agent_op_swap: | |
4547 | /* Interchange top two stack elements, making sure top gets | |
4548 | copied back onto stack. */ | |
4549 | stack[sp] = top; | |
4550 | top = stack[sp - 1]; | |
4551 | stack[sp - 1] = stack[sp]; | |
4552 | break; | |
4553 | ||
4554 | case gdb_agent_op_getv: | |
4555 | /* Flush the cached stack top. */ | |
4556 | stack[sp++] = top; | |
4557 | arg = aexpr->bytes[pc++]; | |
4558 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
4559 | top = get_trace_state_variable_value (arg); | |
4560 | break; | |
4561 | ||
4562 | case gdb_agent_op_setv: | |
4563 | arg = aexpr->bytes[pc++]; | |
4564 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
4565 | set_trace_state_variable_value (arg, top); | |
4566 | /* Note that we leave the value on the stack, for the | |
4567 | benefit of later/enclosing expressions. */ | |
4568 | break; | |
4569 | ||
4570 | case gdb_agent_op_tracev: | |
4571 | arg = aexpr->bytes[pc++]; | |
4572 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
4573 | agent_tsv_read (tframe, arg); | |
4574 | break; | |
4575 | ||
4576 | /* GDB never (currently) generates any of these ops. */ | |
4577 | case gdb_agent_op_float: | |
4578 | case gdb_agent_op_ref_float: | |
4579 | case gdb_agent_op_ref_double: | |
4580 | case gdb_agent_op_ref_long_double: | |
4581 | case gdb_agent_op_l_to_d: | |
4582 | case gdb_agent_op_d_to_l: | |
4583 | case gdb_agent_op_trace16: | |
4584 | trace_debug ("Agent expression op 0x%x valid, but not handled", | |
4585 | op); | |
4586 | /* If ever GDB generates any of these, we don't have the | |
4587 | option of ignoring. */ | |
4588 | return 1; | |
4589 | ||
4590 | default: | |
4591 | trace_debug ("Agent expression op 0x%x not recognized", op); | |
4592 | /* Don't struggle on, things will just get worse. */ | |
4593 | return expr_eval_unrecognized_opcode; | |
4594 | } | |
4595 | ||
4596 | /* Check for stack badness. */ | |
4597 | if (sp >= (STACK_MAX - 1)) | |
4598 | { | |
4599 | trace_debug ("Expression stack overflow"); | |
4600 | return expr_eval_stack_overflow; | |
4601 | } | |
4602 | ||
4603 | if (sp < 0) | |
4604 | { | |
4605 | trace_debug ("Expression stack underflow"); | |
4606 | return expr_eval_stack_underflow; | |
4607 | } | |
4608 | ||
4609 | trace_debug ("Op %s -> sp=%d, top=0x%s", | |
94d5e490 | 4610 | gdb_agent_op_name (op), sp, pulongest (top)); |
219f2f23 PA |
4611 | } |
4612 | } | |
4613 | ||
4614 | /* Do memory copies for bytecodes. */ | |
4615 | /* Do the recording of memory blocks for actions and bytecodes. */ | |
4616 | ||
4617 | static int | |
4618 | agent_mem_read (struct traceframe *tframe, | |
4619 | unsigned char *to, CORE_ADDR from, ULONGEST len) | |
4620 | { | |
4621 | unsigned char *mspace; | |
4622 | ULONGEST remaining = len; | |
4623 | unsigned short blocklen; | |
4624 | ||
4625 | /* If a 'to' buffer is specified, use it. */ | |
4626 | if (to != NULL) | |
4627 | { | |
4628 | read_inferior_memory (from, to, len); | |
4629 | return 0; | |
4630 | } | |
4631 | ||
4632 | /* Otherwise, create a new memory block in the trace buffer. */ | |
4633 | while (remaining > 0) | |
4634 | { | |
4635 | size_t sp; | |
4636 | ||
4637 | blocklen = (remaining > 65535 ? 65535 : remaining); | |
4638 | sp = 1 + sizeof (from) + sizeof (blocklen) + blocklen; | |
4639 | mspace = add_traceframe_block (tframe, sp); | |
4640 | if (mspace == NULL) | |
4641 | return 1; | |
4642 | /* Identify block as a memory block. */ | |
4643 | *mspace = 'M'; | |
4644 | ++mspace; | |
4645 | /* Record address and size. */ | |
4646 | memcpy (mspace, &from, sizeof (from)); | |
4647 | mspace += sizeof (from); | |
4648 | memcpy (mspace, &blocklen, sizeof (blocklen)); | |
4649 | mspace += sizeof (blocklen); | |
4650 | /* Record the memory block proper. */ | |
4651 | read_inferior_memory (from, mspace, blocklen); | |
4652 | trace_debug ("%d bytes recorded", blocklen); | |
4653 | remaining -= blocklen; | |
4654 | from += blocklen; | |
4655 | } | |
4656 | return 0; | |
4657 | } | |
4658 | ||
4659 | /* Record the value of a trace state variable. */ | |
4660 | ||
4661 | static int | |
4662 | agent_tsv_read (struct traceframe *tframe, int n) | |
4663 | { | |
4664 | unsigned char *vspace; | |
4665 | LONGEST val; | |
4666 | ||
4667 | vspace = add_traceframe_block (tframe, | |
4668 | 1 + sizeof (n) + sizeof (LONGEST)); | |
4669 | if (vspace == NULL) | |
4670 | return 1; | |
4671 | /* Identify block as a variable. */ | |
4672 | *vspace = 'V'; | |
4673 | /* Record variable's number and value. */ | |
4674 | memcpy (vspace + 1, &n, sizeof (n)); | |
4675 | val = get_trace_state_variable_value (n); | |
4676 | memcpy (vspace + 1 + sizeof (n), &val, sizeof (val)); | |
4677 | trace_debug ("Variable %d recorded", n); | |
4678 | return 0; | |
4679 | } | |
4680 | ||
fa593d66 PA |
4681 | #ifndef IN_PROCESS_AGENT |
4682 | ||
b3b9301e PA |
4683 | /* Callback for traceframe_walk_blocks, used to find a given block |
4684 | type in a traceframe. */ | |
4685 | ||
4686 | static int | |
4687 | match_blocktype (char blocktype, unsigned char *dataptr, void *data) | |
4688 | { | |
4689 | char *wantedp = data; | |
4690 | ||
4691 | if (*wantedp == blocktype) | |
4692 | return 1; | |
4693 | ||
4694 | return 0; | |
4695 | } | |
4696 | ||
4697 | /* Walk over all traceframe blocks of the traceframe buffer starting | |
4698 | at DATABASE, of DATASIZE bytes long, and call CALLBACK for each | |
4699 | block found, passing in DATA unmodified. If CALLBACK returns true, | |
4700 | this returns a pointer to where the block is found. Returns NULL | |
4701 | if no callback call returned true, indicating that all blocks have | |
4702 | been walked. */ | |
4703 | ||
219f2f23 | 4704 | static unsigned char * |
b3b9301e PA |
4705 | traceframe_walk_blocks (unsigned char *database, unsigned int datasize, |
4706 | int tfnum, | |
4707 | int (*callback) (char blocktype, | |
4708 | unsigned char *dataptr, | |
4709 | void *data), | |
4710 | void *data) | |
219f2f23 PA |
4711 | { |
4712 | unsigned char *dataptr; | |
4713 | ||
4714 | if (datasize == 0) | |
4715 | { | |
4716 | trace_debug ("traceframe %d has no data", tfnum); | |
4717 | return NULL; | |
4718 | } | |
4719 | ||
4720 | /* Iterate through a traceframe's blocks, looking for a block of the | |
4721 | requested type. */ | |
4722 | for (dataptr = database; | |
4723 | dataptr < database + datasize; | |
4724 | /* nothing */) | |
4725 | { | |
4726 | char blocktype; | |
4727 | unsigned short mlen; | |
4728 | ||
4729 | if (dataptr == trace_buffer_wrap) | |
4730 | { | |
4731 | /* Adjust to reflect wrapping part of the frame around to | |
4732 | the beginning. */ | |
4733 | datasize = dataptr - database; | |
4734 | dataptr = database = trace_buffer_lo; | |
4735 | } | |
b3b9301e | 4736 | |
219f2f23 PA |
4737 | blocktype = *dataptr++; |
4738 | ||
b3b9301e | 4739 | if ((*callback) (blocktype, dataptr, data)) |
219f2f23 PA |
4740 | return dataptr; |
4741 | ||
4742 | switch (blocktype) | |
4743 | { | |
4744 | case 'R': | |
4745 | /* Skip over the registers block. */ | |
4746 | dataptr += register_cache_size (); | |
4747 | break; | |
4748 | case 'M': | |
4749 | /* Skip over the memory block. */ | |
4750 | dataptr += sizeof (CORE_ADDR); | |
4751 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
4752 | dataptr += (sizeof (mlen) + mlen); | |
4753 | break; | |
219f2f23 PA |
4754 | case 'V': |
4755 | /* Skip over the TSV block. */ | |
4756 | dataptr += (sizeof (int) + sizeof (LONGEST)); | |
4757 | break; | |
0fb4aa4b PA |
4758 | case 'S': |
4759 | /* Skip over the static trace data block. */ | |
4760 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
4761 | dataptr += (sizeof (mlen) + mlen); | |
4762 | break; | |
219f2f23 PA |
4763 | default: |
4764 | trace_debug ("traceframe %d has unknown block type 0x%x", | |
4765 | tfnum, blocktype); | |
4766 | return NULL; | |
4767 | } | |
4768 | } | |
4769 | ||
4770 | return NULL; | |
4771 | } | |
4772 | ||
b3b9301e PA |
4773 | /* Look for the block of type TYPE_WANTED in the trameframe starting |
4774 | at DATABASE of DATASIZE bytes long. TFNUM is the traceframe | |
4775 | number. */ | |
4776 | ||
4777 | static unsigned char * | |
4778 | traceframe_find_block_type (unsigned char *database, unsigned int datasize, | |
4779 | int tfnum, char type_wanted) | |
4780 | { | |
4781 | return traceframe_walk_blocks (database, datasize, tfnum, | |
4782 | match_blocktype, &type_wanted); | |
4783 | } | |
4784 | ||
219f2f23 PA |
4785 | static unsigned char * |
4786 | traceframe_find_regblock (struct traceframe *tframe, int tfnum) | |
4787 | { | |
4788 | unsigned char *regblock; | |
4789 | ||
4790 | regblock = traceframe_find_block_type (tframe->data, | |
4791 | tframe->data_size, | |
4792 | tfnum, 'R'); | |
4793 | ||
4794 | if (regblock == NULL) | |
4795 | trace_debug ("traceframe %d has no register data", tfnum); | |
4796 | ||
4797 | return regblock; | |
4798 | } | |
4799 | ||
4800 | /* Get registers from a traceframe. */ | |
4801 | ||
4802 | int | |
4803 | fetch_traceframe_registers (int tfnum, struct regcache *regcache, int regnum) | |
4804 | { | |
4805 | unsigned char *dataptr; | |
4806 | struct tracepoint *tpoint; | |
4807 | struct traceframe *tframe; | |
4808 | ||
4809 | tframe = find_traceframe (tfnum); | |
4810 | ||
4811 | if (tframe == NULL) | |
4812 | { | |
4813 | trace_debug ("traceframe %d not found", tfnum); | |
4814 | return 1; | |
4815 | } | |
4816 | ||
4817 | dataptr = traceframe_find_regblock (tframe, tfnum); | |
4818 | if (dataptr == NULL) | |
4819 | { | |
1c79eb8a | 4820 | /* Mark registers unavailable. */ |
219f2f23 PA |
4821 | supply_regblock (regcache, NULL); |
4822 | ||
4823 | /* We can generally guess at a PC, although this will be | |
4824 | misleading for while-stepping frames and multi-location | |
4825 | tracepoints. */ | |
4826 | tpoint = find_next_tracepoint_by_number (NULL, tframe->tpnum); | |
4827 | if (tpoint != NULL) | |
4828 | regcache_write_pc (regcache, tpoint->address); | |
4829 | } | |
4830 | else | |
4831 | supply_regblock (regcache, dataptr); | |
4832 | ||
4833 | return 0; | |
4834 | } | |
4835 | ||
4836 | static CORE_ADDR | |
4837 | traceframe_get_pc (struct traceframe *tframe) | |
4838 | { | |
4839 | struct regcache regcache; | |
4840 | unsigned char *dataptr; | |
4841 | ||
4842 | dataptr = traceframe_find_regblock (tframe, -1); | |
4843 | if (dataptr == NULL) | |
4844 | return 0; | |
4845 | ||
4846 | init_register_cache (®cache, dataptr); | |
4847 | return regcache_read_pc (®cache); | |
4848 | } | |
4849 | ||
4850 | /* Read a requested block of memory from a trace frame. */ | |
4851 | ||
4852 | int | |
4853 | traceframe_read_mem (int tfnum, CORE_ADDR addr, | |
4854 | unsigned char *buf, ULONGEST length, | |
4855 | ULONGEST *nbytes) | |
4856 | { | |
4857 | struct traceframe *tframe; | |
4858 | unsigned char *database, *dataptr; | |
4859 | unsigned int datasize; | |
4860 | CORE_ADDR maddr; | |
4861 | unsigned short mlen; | |
4862 | ||
4863 | trace_debug ("traceframe_read_mem"); | |
4864 | ||
4865 | tframe = find_traceframe (tfnum); | |
4866 | ||
4867 | if (!tframe) | |
4868 | { | |
4869 | trace_debug ("traceframe %d not found", tfnum); | |
4870 | return 1; | |
4871 | } | |
4872 | ||
4873 | datasize = tframe->data_size; | |
4874 | database = dataptr = &tframe->data[0]; | |
4875 | ||
4876 | /* Iterate through a traceframe's blocks, looking for memory. */ | |
4877 | while ((dataptr = traceframe_find_block_type (dataptr, | |
493e2a69 MS |
4878 | datasize |
4879 | - (dataptr - database), | |
219f2f23 PA |
4880 | tfnum, 'M')) != NULL) |
4881 | { | |
4882 | memcpy (&maddr, dataptr, sizeof (maddr)); | |
4883 | dataptr += sizeof (maddr); | |
4884 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
4885 | dataptr += sizeof (mlen); | |
4886 | trace_debug ("traceframe %d has %d bytes at %s", | |
4887 | tfnum, mlen, paddress (maddr)); | |
4888 | ||
764880b7 PA |
4889 | /* If the block includes the first part of the desired range, |
4890 | return as much it has; GDB will re-request the remainder, | |
4891 | which might be in a different block of this trace frame. */ | |
4892 | if (maddr <= addr && addr < (maddr + mlen)) | |
219f2f23 | 4893 | { |
764880b7 PA |
4894 | ULONGEST amt = (maddr + mlen) - addr; |
4895 | if (amt > length) | |
4896 | amt = length; | |
4897 | ||
4898 | memcpy (buf, dataptr + (addr - maddr), amt); | |
4899 | *nbytes = amt; | |
219f2f23 PA |
4900 | return 0; |
4901 | } | |
4902 | ||
4903 | /* Skip over this block. */ | |
4904 | dataptr += mlen; | |
4905 | } | |
4906 | ||
4907 | trace_debug ("traceframe %d has no memory data for the desired region", | |
4908 | tfnum); | |
4909 | ||
4910 | *nbytes = 0; | |
4911 | return 0; | |
4912 | } | |
4913 | ||
4914 | static int | |
4915 | traceframe_read_tsv (int tsvnum, LONGEST *val) | |
4916 | { | |
4917 | int tfnum; | |
4918 | struct traceframe *tframe; | |
4919 | unsigned char *database, *dataptr; | |
4920 | unsigned int datasize; | |
4921 | int vnum; | |
4922 | ||
4923 | trace_debug ("traceframe_read_tsv"); | |
4924 | ||
4925 | tfnum = current_traceframe; | |
4926 | ||
4927 | if (tfnum < 0) | |
4928 | { | |
4929 | trace_debug ("no current traceframe"); | |
4930 | return 1; | |
4931 | } | |
4932 | ||
4933 | tframe = find_traceframe (tfnum); | |
4934 | ||
4935 | if (tframe == NULL) | |
4936 | { | |
4937 | trace_debug ("traceframe %d not found", tfnum); | |
4938 | return 1; | |
4939 | } | |
4940 | ||
4941 | datasize = tframe->data_size; | |
4942 | database = dataptr = &tframe->data[0]; | |
4943 | ||
4944 | /* Iterate through a traceframe's blocks, looking for the tsv. */ | |
4945 | while ((dataptr = traceframe_find_block_type (dataptr, | |
493e2a69 MS |
4946 | datasize |
4947 | - (dataptr - database), | |
219f2f23 PA |
4948 | tfnum, 'V')) != NULL) |
4949 | { | |
4950 | memcpy (&vnum, dataptr, sizeof (vnum)); | |
4951 | dataptr += sizeof (vnum); | |
4952 | ||
4953 | trace_debug ("traceframe %d has variable %d", tfnum, vnum); | |
4954 | ||
4955 | /* Check that this is the variable we want. */ | |
4956 | if (tsvnum == vnum) | |
4957 | { | |
4958 | memcpy (val, dataptr, sizeof (*val)); | |
4959 | return 0; | |
4960 | } | |
4961 | ||
4962 | /* Skip over this block. */ | |
4963 | dataptr += sizeof (LONGEST); | |
4964 | } | |
4965 | ||
4966 | trace_debug ("traceframe %d has no data for variable %d", | |
4967 | tfnum, tsvnum); | |
4968 | return 1; | |
4969 | } | |
4970 | ||
0fb4aa4b PA |
4971 | /* Read a requested block of static tracepoint data from a trace |
4972 | frame. */ | |
4973 | ||
4974 | int | |
4975 | traceframe_read_sdata (int tfnum, ULONGEST offset, | |
4976 | unsigned char *buf, ULONGEST length, | |
4977 | ULONGEST *nbytes) | |
4978 | { | |
4979 | struct traceframe *tframe; | |
4980 | unsigned char *database, *dataptr; | |
4981 | unsigned int datasize; | |
4982 | unsigned short mlen; | |
4983 | ||
4984 | trace_debug ("traceframe_read_sdata"); | |
4985 | ||
4986 | tframe = find_traceframe (tfnum); | |
4987 | ||
4988 | if (!tframe) | |
4989 | { | |
4990 | trace_debug ("traceframe %d not found", tfnum); | |
4991 | return 1; | |
4992 | } | |
4993 | ||
4994 | datasize = tframe->data_size; | |
4995 | database = &tframe->data[0]; | |
4996 | ||
4997 | /* Iterate through a traceframe's blocks, looking for static | |
4998 | tracepoint data. */ | |
4999 | dataptr = traceframe_find_block_type (database, datasize, | |
5000 | tfnum, 'S'); | |
5001 | if (dataptr != NULL) | |
5002 | { | |
5003 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5004 | dataptr += sizeof (mlen); | |
5005 | if (offset < mlen) | |
5006 | { | |
5007 | if (offset + length > mlen) | |
5008 | length = mlen - offset; | |
5009 | ||
5010 | memcpy (buf, dataptr, length); | |
5011 | *nbytes = length; | |
5012 | } | |
5013 | else | |
5014 | *nbytes = 0; | |
5015 | return 0; | |
5016 | } | |
5017 | ||
5018 | trace_debug ("traceframe %d has no static trace data", tfnum); | |
5019 | ||
5020 | *nbytes = 0; | |
5021 | return 0; | |
5022 | } | |
5023 | ||
b3b9301e PA |
5024 | /* Callback for traceframe_walk_blocks. Builds a traceframe-info |
5025 | object. DATA is pointer to a struct buffer holding the | |
5026 | traceframe-info object being built. */ | |
5027 | ||
5028 | static int | |
5029 | build_traceframe_info_xml (char blocktype, unsigned char *dataptr, void *data) | |
5030 | { | |
5031 | struct buffer *buffer = data; | |
5032 | ||
5033 | switch (blocktype) | |
5034 | { | |
5035 | case 'M': | |
5036 | { | |
5037 | unsigned short mlen; | |
5038 | CORE_ADDR maddr; | |
5039 | ||
5040 | memcpy (&maddr, dataptr, sizeof (maddr)); | |
5041 | dataptr += sizeof (maddr); | |
5042 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5043 | dataptr += sizeof (mlen); | |
5044 | buffer_xml_printf (buffer, | |
5045 | "<memory start=\"0x%s\" length=\"0x%s\"/>\n", | |
5046 | paddress (maddr), phex_nz (mlen, sizeof (mlen))); | |
5047 | break; | |
5048 | } | |
5049 | case 'V': | |
5050 | case 'R': | |
5051 | case 'S': | |
5052 | { | |
5053 | break; | |
5054 | } | |
5055 | default: | |
5056 | warning ("Unhandled trace block type (%d) '%c ' " | |
5057 | "while building trace frame info.", | |
5058 | blocktype, blocktype); | |
5059 | break; | |
5060 | } | |
5061 | ||
5062 | return 0; | |
5063 | } | |
5064 | ||
5065 | /* Build a traceframe-info object for traceframe number TFNUM into | |
5066 | BUFFER. */ | |
5067 | ||
5068 | int | |
5069 | traceframe_read_info (int tfnum, struct buffer *buffer) | |
5070 | { | |
5071 | struct traceframe *tframe; | |
5072 | ||
5073 | trace_debug ("traceframe_read_info"); | |
5074 | ||
5075 | tframe = find_traceframe (tfnum); | |
5076 | ||
5077 | if (!tframe) | |
5078 | { | |
5079 | trace_debug ("traceframe %d not found", tfnum); | |
5080 | return 1; | |
5081 | } | |
5082 | ||
5083 | buffer_grow_str (buffer, "<traceframe-info>\n"); | |
5084 | traceframe_walk_blocks (tframe->data, tframe->data_size, | |
5085 | tfnum, build_traceframe_info_xml, buffer); | |
5086 | buffer_grow_str0 (buffer, "</traceframe-info>\n"); | |
5087 | return 0; | |
5088 | } | |
5089 | ||
fa593d66 PA |
5090 | /* Return the first fast tracepoint whose jump pad contains PC. */ |
5091 | ||
5092 | static struct tracepoint * | |
5093 | fast_tracepoint_from_jump_pad_address (CORE_ADDR pc) | |
5094 | { | |
5095 | struct tracepoint *tpoint; | |
5096 | ||
5097 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
5098 | if (tpoint->type == fast_tracepoint) | |
5099 | if (tpoint->jump_pad <= pc && pc < tpoint->jump_pad_end) | |
5100 | return tpoint; | |
5101 | ||
5102 | return NULL; | |
5103 | } | |
5104 | ||
5105 | /* Return GDBserver's tracepoint that matches the IP Agent's | |
5106 | tracepoint object that lives at IPA_TPOINT_OBJ in the IP Agent's | |
5107 | address space. */ | |
5108 | ||
5109 | static struct tracepoint * | |
5110 | fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR ipa_tpoint_obj) | |
5111 | { | |
5112 | struct tracepoint *tpoint; | |
5113 | ||
5114 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
5115 | if (tpoint->type == fast_tracepoint) | |
5116 | if (tpoint->obj_addr_on_target == ipa_tpoint_obj) | |
5117 | return tpoint; | |
5118 | ||
5119 | return NULL; | |
5120 | } | |
5121 | ||
5122 | #endif | |
5123 | ||
5124 | /* The type of the object that is used to synchronize fast tracepoint | |
5125 | collection. */ | |
5126 | ||
5127 | typedef struct collecting_t | |
5128 | { | |
5129 | /* The fast tracepoint number currently collecting. */ | |
5130 | uintptr_t tpoint; | |
5131 | ||
5132 | /* A number that GDBserver can use to identify the thread that is | |
5133 | presently holding the collect lock. This need not (and usually | |
5134 | is not) the thread id, as getting the current thread ID usually | |
5135 | requires a system call, which we want to avoid like the plague. | |
5136 | Usually this is thread's TCB, found in the TLS (pseudo-) | |
5137 | register, which is readable with a single insn on several | |
5138 | architectures. */ | |
5139 | uintptr_t thread_area; | |
5140 | } collecting_t; | |
5141 | ||
5142 | #ifndef IN_PROCESS_AGENT | |
5143 | ||
5144 | void | |
5145 | force_unlock_trace_buffer (void) | |
5146 | { | |
5147 | write_inferior_data_pointer (ipa_sym_addrs.addr_collecting, 0); | |
5148 | } | |
5149 | ||
5150 | /* Check if the thread identified by THREAD_AREA which is stopped at | |
5151 | STOP_PC, is presently locking the fast tracepoint collection, and | |
5152 | if so, gather some status of said collection. Returns 0 if the | |
5153 | thread isn't collecting or in the jump pad at all. 1, if in the | |
5154 | jump pad (or within gdb_collect) and hasn't executed the adjusted | |
5155 | original insn yet (can set a breakpoint there and run to it). 2, | |
5156 | if presently executing the adjusted original insn --- in which | |
5157 | case, if we want to move the thread out of the jump pad, we need to | |
5158 | single-step it until this function returns 0. */ | |
5159 | ||
5160 | int | |
5161 | fast_tracepoint_collecting (CORE_ADDR thread_area, | |
5162 | CORE_ADDR stop_pc, | |
5163 | struct fast_tpoint_collect_status *status) | |
5164 | { | |
5165 | CORE_ADDR ipa_collecting; | |
5166 | CORE_ADDR ipa_gdb_jump_pad_buffer, ipa_gdb_jump_pad_buffer_end; | |
5167 | struct tracepoint *tpoint; | |
5168 | int needs_breakpoint; | |
5169 | ||
5170 | /* The thread THREAD_AREA is either: | |
5171 | ||
5172 | 0. not collecting at all, not within the jump pad, or within | |
5173 | gdb_collect or one of its callees. | |
5174 | ||
5175 | 1. in the jump pad and haven't reached gdb_collect | |
5176 | ||
5177 | 2. within gdb_collect (out of the jump pad) (collect is set) | |
5178 | ||
5179 | 3. we're in the jump pad, after gdb_collect having returned, | |
5180 | possibly executing the adjusted insns. | |
5181 | ||
5182 | For cases 1 and 3, `collecting' may or not be set. The jump pad | |
5183 | doesn't have any complicated jump logic, so we can tell if the | |
5184 | thread is executing the adjust original insn or not by just | |
5185 | matching STOP_PC with known jump pad addresses. If we it isn't | |
5186 | yet executing the original insn, set a breakpoint there, and let | |
5187 | the thread run to it, so to quickly step over a possible (many | |
5188 | insns) gdb_collect call. Otherwise, or when the breakpoint is | |
5189 | hit, only a few (small number of) insns are left to be executed | |
5190 | in the jump pad. Single-step the thread until it leaves the | |
5191 | jump pad. */ | |
5192 | ||
5193 | again: | |
5194 | tpoint = NULL; | |
5195 | needs_breakpoint = 0; | |
5196 | trace_debug ("fast_tracepoint_collecting"); | |
5197 | ||
5198 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer, | |
5199 | &ipa_gdb_jump_pad_buffer)) | |
5200 | fatal ("error extracting `gdb_jump_pad_buffer'"); | |
5201 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer_end, | |
5202 | &ipa_gdb_jump_pad_buffer_end)) | |
5203 | fatal ("error extracting `gdb_jump_pad_buffer_end'"); | |
5204 | ||
493e2a69 MS |
5205 | if (ipa_gdb_jump_pad_buffer <= stop_pc |
5206 | && stop_pc < ipa_gdb_jump_pad_buffer_end) | |
fa593d66 PA |
5207 | { |
5208 | /* We can tell which tracepoint(s) the thread is collecting by | |
5209 | matching the jump pad address back to the tracepoint. */ | |
5210 | tpoint = fast_tracepoint_from_jump_pad_address (stop_pc); | |
5211 | if (tpoint == NULL) | |
5212 | { | |
5213 | warning ("in jump pad, but no matching tpoint?"); | |
5214 | return 0; | |
5215 | } | |
5216 | else | |
5217 | { | |
5218 | trace_debug ("in jump pad of tpoint (%d, %s); jump_pad(%s, %s); " | |
5219 | "adj_insn(%s, %s)", | |
5220 | tpoint->number, paddress (tpoint->address), | |
5221 | paddress (tpoint->jump_pad), | |
5222 | paddress (tpoint->jump_pad_end), | |
5223 | paddress (tpoint->adjusted_insn_addr), | |
5224 | paddress (tpoint->adjusted_insn_addr_end)); | |
5225 | } | |
5226 | ||
5227 | /* Definitely in the jump pad. May or may not need | |
5228 | fast-exit-jump-pad breakpoint. */ | |
5229 | if (tpoint->jump_pad <= stop_pc | |
5230 | && stop_pc < tpoint->adjusted_insn_addr) | |
5231 | needs_breakpoint = 1; | |
5232 | } | |
5233 | else | |
5234 | { | |
5235 | collecting_t ipa_collecting_obj; | |
5236 | ||
5237 | /* If `collecting' is set/locked, then the THREAD_AREA thread | |
5238 | may or not be the one holding the lock. We have to read the | |
5239 | lock to find out. */ | |
5240 | ||
5241 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_collecting, | |
5242 | &ipa_collecting)) | |
5243 | { | |
5244 | trace_debug ("fast_tracepoint_collecting:" | |
5245 | " failed reading 'collecting' in the inferior"); | |
5246 | return 0; | |
5247 | } | |
5248 | ||
5249 | if (!ipa_collecting) | |
5250 | { | |
5251 | trace_debug ("fast_tracepoint_collecting: not collecting" | |
5252 | " (and nobody is)."); | |
5253 | return 0; | |
5254 | } | |
5255 | ||
5256 | /* Some thread is collecting. Check which. */ | |
5257 | if (read_inferior_memory (ipa_collecting, | |
5258 | (unsigned char *) &ipa_collecting_obj, | |
5259 | sizeof (ipa_collecting_obj)) != 0) | |
5260 | goto again; | |
5261 | ||
5262 | if (ipa_collecting_obj.thread_area != thread_area) | |
5263 | { | |
5264 | trace_debug ("fast_tracepoint_collecting: not collecting " | |
5265 | "(another thread is)"); | |
5266 | return 0; | |
5267 | } | |
5268 | ||
5269 | tpoint | |
5270 | = fast_tracepoint_from_ipa_tpoint_address (ipa_collecting_obj.tpoint); | |
5271 | if (tpoint == NULL) | |
5272 | { | |
5273 | warning ("fast_tracepoint_collecting: collecting, " | |
5274 | "but tpoint %s not found?", | |
5275 | paddress ((CORE_ADDR) ipa_collecting_obj.tpoint)); | |
5276 | return 0; | |
5277 | } | |
5278 | ||
5279 | /* The thread is within `gdb_collect', skip over the rest of | |
5280 | fast tracepoint collection quickly using a breakpoint. */ | |
5281 | needs_breakpoint = 1; | |
5282 | } | |
5283 | ||
5284 | /* The caller wants a bit of status detail. */ | |
5285 | if (status != NULL) | |
5286 | { | |
5287 | status->tpoint_num = tpoint->number; | |
5288 | status->tpoint_addr = tpoint->address; | |
5289 | status->adjusted_insn_addr = tpoint->adjusted_insn_addr; | |
5290 | status->adjusted_insn_addr_end = tpoint->adjusted_insn_addr_end; | |
5291 | } | |
5292 | ||
5293 | if (needs_breakpoint) | |
5294 | { | |
5295 | /* Hasn't executed the original instruction yet. Set breakpoint | |
5296 | there, and wait till it's hit, then single-step until exiting | |
5297 | the jump pad. */ | |
5298 | ||
5299 | trace_debug ("\ | |
5300 | fast_tracepoint_collecting, returning continue-until-break at %s", | |
5301 | paddress (tpoint->adjusted_insn_addr)); | |
5302 | ||
5303 | return 1; /* continue */ | |
5304 | } | |
5305 | else | |
5306 | { | |
5307 | /* Just single-step until exiting the jump pad. */ | |
5308 | ||
5309 | trace_debug ("fast_tracepoint_collecting, returning " | |
5310 | "need-single-step (%s-%s)", | |
5311 | paddress (tpoint->adjusted_insn_addr), | |
5312 | paddress (tpoint->adjusted_insn_addr_end)); | |
5313 | ||
5314 | return 2; /* single-step */ | |
5315 | } | |
5316 | } | |
5317 | ||
5318 | #endif | |
5319 | ||
5320 | #ifdef IN_PROCESS_AGENT | |
5321 | ||
5322 | /* The global fast tracepoint collect lock. Points to a collecting_t | |
5323 | object built on the stack by the jump pad, if presently locked; | |
5324 | NULL if it isn't locked. Note that this lock *must* be set while | |
5325 | executing any *function other than the jump pad. See | |
5326 | fast_tracepoint_collecting. */ | |
5327 | static collecting_t * ATTR_USED collecting; | |
5328 | ||
5329 | /* This routine, called from the jump pad (in asm) is designed to be | |
5330 | called from the jump pads of fast tracepoints, thus it is on the | |
5331 | critical path. */ | |
5332 | ||
5333 | IP_AGENT_EXPORT void ATTR_USED | |
5334 | gdb_collect (struct tracepoint *tpoint, unsigned char *regs) | |
5335 | { | |
5336 | struct fast_tracepoint_ctx ctx; | |
5337 | ||
5338 | /* Don't do anything until the trace run is completely set up. */ | |
5339 | if (!tracing) | |
5340 | return; | |
5341 | ||
5342 | ctx.base.type = fast_tracepoint; | |
5343 | ctx.regs = regs; | |
5344 | ctx.regcache_initted = 0; | |
5345 | ctx.tpoint = tpoint; | |
5346 | ||
5347 | /* Wrap the regblock in a register cache (in the stack, we don't | |
5348 | want to malloc here). */ | |
5349 | ctx.regspace = alloca (register_cache_size ()); | |
5350 | if (ctx.regspace == NULL) | |
5351 | { | |
5352 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
5353 | return; | |
5354 | } | |
5355 | ||
5356 | /* Test the condition if present, and collect if true. */ | |
5357 | if (tpoint->cond == NULL | |
5358 | || condition_true_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
5359 | tpoint)) | |
5360 | { | |
5361 | collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
5362 | tpoint->address, tpoint); | |
5363 | ||
5364 | /* Note that this will cause original insns to be written back | |
5365 | to where we jumped from, but that's OK because we're jumping | |
5366 | back to the next whole instruction. This will go badly if | |
5367 | instruction restoration is not atomic though. */ | |
5368 | if (stopping_tracepoint | |
5369 | || trace_buffer_is_full | |
5370 | || expr_eval_result != expr_eval_no_error) | |
5371 | stop_tracing (); | |
5372 | } | |
5373 | else | |
5374 | { | |
5375 | /* If there was a condition and it evaluated to false, the only | |
5376 | way we would stop tracing is if there was an error during | |
5377 | condition expression evaluation. */ | |
5378 | if (expr_eval_result != expr_eval_no_error) | |
5379 | stop_tracing (); | |
5380 | } | |
5381 | } | |
5382 | ||
5383 | #endif | |
5384 | ||
5385 | #ifndef IN_PROCESS_AGENT | |
5386 | ||
6a271cae PA |
5387 | /* Bytecode compilation. */ |
5388 | ||
5389 | CORE_ADDR current_insn_ptr; | |
5390 | ||
5391 | int emit_error; | |
5392 | ||
5393 | struct bytecode_address | |
5394 | { | |
5395 | int pc; | |
5396 | CORE_ADDR address; | |
5397 | int goto_pc; | |
5398 | /* Offset and size of field to be modified in the goto block. */ | |
5399 | int from_offset, from_size; | |
5400 | struct bytecode_address *next; | |
5401 | } *bytecode_address_table; | |
5402 | ||
5403 | CORE_ADDR | |
5404 | get_raw_reg_func_addr (void) | |
5405 | { | |
5406 | return ipa_sym_addrs.addr_get_raw_reg; | |
5407 | } | |
5408 | ||
5409 | static void | |
5410 | emit_prologue (void) | |
5411 | { | |
5412 | target_emit_ops ()->emit_prologue (); | |
5413 | } | |
5414 | ||
5415 | static void | |
5416 | emit_epilogue (void) | |
5417 | { | |
5418 | target_emit_ops ()->emit_epilogue (); | |
5419 | } | |
5420 | ||
5421 | static void | |
5422 | emit_add (void) | |
5423 | { | |
5424 | target_emit_ops ()->emit_add (); | |
5425 | } | |
5426 | ||
5427 | static void | |
5428 | emit_sub (void) | |
5429 | { | |
5430 | target_emit_ops ()->emit_sub (); | |
5431 | } | |
5432 | ||
5433 | static void | |
5434 | emit_mul (void) | |
5435 | { | |
5436 | target_emit_ops ()->emit_mul (); | |
5437 | } | |
5438 | ||
5439 | static void | |
5440 | emit_lsh (void) | |
5441 | { | |
5442 | target_emit_ops ()->emit_lsh (); | |
5443 | } | |
5444 | ||
5445 | static void | |
5446 | emit_rsh_signed (void) | |
5447 | { | |
5448 | target_emit_ops ()->emit_rsh_signed (); | |
5449 | } | |
5450 | ||
5451 | static void | |
5452 | emit_rsh_unsigned (void) | |
5453 | { | |
5454 | target_emit_ops ()->emit_rsh_unsigned (); | |
5455 | } | |
5456 | ||
5457 | static void | |
5458 | emit_ext (int arg) | |
5459 | { | |
5460 | target_emit_ops ()->emit_ext (arg); | |
5461 | } | |
5462 | ||
5463 | static void | |
5464 | emit_log_not (void) | |
5465 | { | |
5466 | target_emit_ops ()->emit_log_not (); | |
5467 | } | |
5468 | ||
5469 | static void | |
5470 | emit_bit_and (void) | |
5471 | { | |
5472 | target_emit_ops ()->emit_bit_and (); | |
5473 | } | |
5474 | ||
5475 | static void | |
5476 | emit_bit_or (void) | |
5477 | { | |
5478 | target_emit_ops ()->emit_bit_or (); | |
5479 | } | |
5480 | ||
5481 | static void | |
5482 | emit_bit_xor (void) | |
5483 | { | |
5484 | target_emit_ops ()->emit_bit_xor (); | |
5485 | } | |
5486 | ||
5487 | static void | |
5488 | emit_bit_not (void) | |
5489 | { | |
5490 | target_emit_ops ()->emit_bit_not (); | |
5491 | } | |
5492 | ||
5493 | static void | |
5494 | emit_equal (void) | |
5495 | { | |
5496 | target_emit_ops ()->emit_equal (); | |
5497 | } | |
5498 | ||
5499 | static void | |
5500 | emit_less_signed (void) | |
5501 | { | |
5502 | target_emit_ops ()->emit_less_signed (); | |
5503 | } | |
5504 | ||
5505 | static void | |
5506 | emit_less_unsigned (void) | |
5507 | { | |
5508 | target_emit_ops ()->emit_less_unsigned (); | |
5509 | } | |
5510 | ||
5511 | static void | |
5512 | emit_ref (int size) | |
5513 | { | |
5514 | target_emit_ops ()->emit_ref (size); | |
5515 | } | |
5516 | ||
5517 | static void | |
5518 | emit_if_goto (int *offset_p, int *size_p) | |
5519 | { | |
5520 | target_emit_ops ()->emit_if_goto (offset_p, size_p); | |
5521 | } | |
5522 | ||
5523 | static void | |
5524 | emit_goto (int *offset_p, int *size_p) | |
5525 | { | |
5526 | target_emit_ops ()->emit_goto (offset_p, size_p); | |
5527 | } | |
5528 | ||
5529 | static void | |
5530 | write_goto_address (CORE_ADDR from, CORE_ADDR to, int size) | |
5531 | { | |
5532 | target_emit_ops ()->write_goto_address (from, to, size); | |
5533 | } | |
5534 | ||
5535 | static void | |
4e29fb54 | 5536 | emit_const (LONGEST num) |
6a271cae PA |
5537 | { |
5538 | target_emit_ops ()->emit_const (num); | |
5539 | } | |
5540 | ||
5541 | static void | |
5542 | emit_reg (int reg) | |
5543 | { | |
5544 | target_emit_ops ()->emit_reg (reg); | |
5545 | } | |
5546 | ||
5547 | static void | |
5548 | emit_pop (void) | |
5549 | { | |
5550 | target_emit_ops ()->emit_pop (); | |
5551 | } | |
5552 | ||
5553 | static void | |
5554 | emit_stack_flush (void) | |
5555 | { | |
5556 | target_emit_ops ()->emit_stack_flush (); | |
5557 | } | |
5558 | ||
5559 | static void | |
5560 | emit_zero_ext (int arg) | |
5561 | { | |
5562 | target_emit_ops ()->emit_zero_ext (arg); | |
5563 | } | |
5564 | ||
5565 | static void | |
5566 | emit_swap (void) | |
5567 | { | |
5568 | target_emit_ops ()->emit_swap (); | |
5569 | } | |
5570 | ||
5571 | static void | |
5572 | emit_stack_adjust (int n) | |
5573 | { | |
5574 | target_emit_ops ()->emit_stack_adjust (n); | |
5575 | } | |
5576 | ||
5577 | /* FN's prototype is `LONGEST(*fn)(int)'. */ | |
5578 | ||
5579 | static void | |
5580 | emit_int_call_1 (CORE_ADDR fn, int arg1) | |
5581 | { | |
5582 | target_emit_ops ()->emit_int_call_1 (fn, arg1); | |
5583 | } | |
5584 | ||
4e29fb54 | 5585 | /* FN's prototype is `void(*fn)(int,LONGEST)'. */ |
6a271cae PA |
5586 | |
5587 | static void | |
5588 | emit_void_call_2 (CORE_ADDR fn, int arg1) | |
5589 | { | |
5590 | target_emit_ops ()->emit_void_call_2 (fn, arg1); | |
5591 | } | |
5592 | ||
5593 | static enum eval_result_type compile_bytecodes (struct agent_expr *aexpr); | |
5594 | ||
5595 | static void | |
493e2a69 MS |
5596 | compile_tracepoint_condition (struct tracepoint *tpoint, |
5597 | CORE_ADDR *jump_entry) | |
6a271cae PA |
5598 | { |
5599 | CORE_ADDR entry_point = *jump_entry; | |
5600 | enum eval_result_type err; | |
5601 | ||
5602 | trace_debug ("Starting condition compilation for tracepoint %d\n", | |
5603 | tpoint->number); | |
5604 | ||
5605 | /* Initialize the global pointer to the code being built. */ | |
5606 | current_insn_ptr = *jump_entry; | |
5607 | ||
5608 | emit_prologue (); | |
5609 | ||
5610 | err = compile_bytecodes (tpoint->cond); | |
5611 | ||
5612 | if (err == expr_eval_no_error) | |
5613 | { | |
5614 | emit_epilogue (); | |
5615 | ||
5616 | /* Record the beginning of the compiled code. */ | |
5617 | tpoint->compiled_cond = entry_point; | |
5618 | ||
5619 | trace_debug ("Condition compilation for tracepoint %d complete\n", | |
5620 | tpoint->number); | |
5621 | } | |
5622 | else | |
5623 | { | |
5624 | /* Leave the unfinished code in situ, but don't point to it. */ | |
5625 | ||
5626 | tpoint->compiled_cond = 0; | |
5627 | ||
5628 | trace_debug ("Condition compilation for tracepoint %d failed, " | |
5629 | "error code %d", | |
5630 | tpoint->number, err); | |
5631 | } | |
5632 | ||
5633 | /* Update the code pointer passed in. Note that we do this even if | |
5634 | the compile fails, so that we can look at the partial results | |
5635 | instead of letting them be overwritten. */ | |
5636 | *jump_entry = current_insn_ptr; | |
5637 | ||
5638 | /* Leave a gap, to aid dump decipherment. */ | |
5639 | *jump_entry += 16; | |
5640 | } | |
5641 | ||
5642 | /* Given an agent expression, turn it into native code. */ | |
5643 | ||
5644 | static enum eval_result_type | |
5645 | compile_bytecodes (struct agent_expr *aexpr) | |
5646 | { | |
5647 | int pc = 0; | |
5648 | int done = 0; | |
5649 | unsigned char op; | |
5650 | int arg; | |
5651 | /* This is only used to build 64-bit value for constants. */ | |
5652 | ULONGEST top; | |
5653 | struct bytecode_address *aentry, *aentry2; | |
5654 | ||
5655 | #define UNHANDLED \ | |
5656 | do \ | |
5657 | { \ | |
5658 | trace_debug ("Cannot compile op 0x%x\n", op); \ | |
5659 | return expr_eval_unhandled_opcode; \ | |
5660 | } while (0) | |
5661 | ||
5662 | if (aexpr->length == 0) | |
5663 | { | |
5664 | trace_debug ("empty agent expression\n"); | |
5665 | return expr_eval_empty_expression; | |
5666 | } | |
5667 | ||
5668 | bytecode_address_table = NULL; | |
5669 | ||
5670 | while (!done) | |
5671 | { | |
5672 | op = aexpr->bytes[pc]; | |
5673 | ||
5674 | trace_debug ("About to compile op 0x%x, pc=%d\n", op, pc); | |
5675 | ||
5676 | /* Record the compiled-code address of the bytecode, for use by | |
5677 | jump instructions. */ | |
5678 | aentry = xmalloc (sizeof (struct bytecode_address)); | |
5679 | aentry->pc = pc; | |
5680 | aentry->address = current_insn_ptr; | |
5681 | aentry->goto_pc = -1; | |
5682 | aentry->from_offset = aentry->from_size = 0; | |
5683 | aentry->next = bytecode_address_table; | |
5684 | bytecode_address_table = aentry; | |
5685 | ||
5686 | ++pc; | |
5687 | ||
5688 | emit_error = 0; | |
5689 | ||
5690 | switch (op) | |
5691 | { | |
5692 | case gdb_agent_op_add: | |
5693 | emit_add (); | |
5694 | break; | |
5695 | ||
5696 | case gdb_agent_op_sub: | |
5697 | emit_sub (); | |
5698 | break; | |
5699 | ||
5700 | case gdb_agent_op_mul: | |
5701 | emit_mul (); | |
5702 | break; | |
5703 | ||
5704 | case gdb_agent_op_div_signed: | |
5705 | UNHANDLED; | |
5706 | break; | |
5707 | ||
5708 | case gdb_agent_op_div_unsigned: | |
5709 | UNHANDLED; | |
5710 | break; | |
5711 | ||
5712 | case gdb_agent_op_rem_signed: | |
5713 | UNHANDLED; | |
5714 | break; | |
5715 | ||
5716 | case gdb_agent_op_rem_unsigned: | |
5717 | UNHANDLED; | |
5718 | break; | |
5719 | ||
5720 | case gdb_agent_op_lsh: | |
5721 | emit_lsh (); | |
5722 | break; | |
5723 | ||
5724 | case gdb_agent_op_rsh_signed: | |
5725 | emit_rsh_signed (); | |
5726 | break; | |
5727 | ||
5728 | case gdb_agent_op_rsh_unsigned: | |
5729 | emit_rsh_unsigned (); | |
5730 | break; | |
5731 | ||
5732 | case gdb_agent_op_trace: | |
5733 | UNHANDLED; | |
5734 | break; | |
5735 | ||
5736 | case gdb_agent_op_trace_quick: | |
5737 | UNHANDLED; | |
5738 | break; | |
5739 | ||
5740 | case gdb_agent_op_log_not: | |
5741 | emit_log_not (); | |
5742 | break; | |
5743 | ||
5744 | case gdb_agent_op_bit_and: | |
5745 | emit_bit_and (); | |
5746 | break; | |
5747 | ||
5748 | case gdb_agent_op_bit_or: | |
5749 | emit_bit_or (); | |
5750 | break; | |
5751 | ||
5752 | case gdb_agent_op_bit_xor: | |
5753 | emit_bit_xor (); | |
5754 | break; | |
5755 | ||
5756 | case gdb_agent_op_bit_not: | |
5757 | emit_bit_not (); | |
5758 | break; | |
5759 | ||
5760 | case gdb_agent_op_equal: | |
5761 | emit_equal (); | |
5762 | break; | |
5763 | ||
5764 | case gdb_agent_op_less_signed: | |
5765 | emit_less_signed (); | |
5766 | break; | |
5767 | ||
5768 | case gdb_agent_op_less_unsigned: | |
5769 | emit_less_unsigned (); | |
5770 | break; | |
5771 | ||
5772 | case gdb_agent_op_ext: | |
5773 | arg = aexpr->bytes[pc++]; | |
5774 | if (arg < (sizeof (LONGEST) * 8)) | |
5775 | emit_ext (arg); | |
5776 | break; | |
5777 | ||
5778 | case gdb_agent_op_ref8: | |
5779 | emit_ref (1); | |
5780 | break; | |
5781 | ||
5782 | case gdb_agent_op_ref16: | |
5783 | emit_ref (2); | |
5784 | break; | |
5785 | ||
5786 | case gdb_agent_op_ref32: | |
5787 | emit_ref (4); | |
5788 | break; | |
5789 | ||
5790 | case gdb_agent_op_ref64: | |
5791 | emit_ref (8); | |
5792 | break; | |
5793 | ||
5794 | case gdb_agent_op_if_goto: | |
5795 | arg = aexpr->bytes[pc++]; | |
5796 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
5797 | aentry->goto_pc = arg; | |
5798 | emit_if_goto (&(aentry->from_offset), &(aentry->from_size)); | |
5799 | break; | |
5800 | ||
5801 | case gdb_agent_op_goto: | |
5802 | arg = aexpr->bytes[pc++]; | |
5803 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
5804 | aentry->goto_pc = arg; | |
5805 | emit_goto (&(aentry->from_offset), &(aentry->from_size)); | |
5806 | break; | |
5807 | ||
5808 | case gdb_agent_op_const8: | |
5809 | emit_stack_flush (); | |
5810 | top = aexpr->bytes[pc++]; | |
5811 | emit_const (top); | |
5812 | break; | |
5813 | ||
5814 | case gdb_agent_op_const16: | |
5815 | emit_stack_flush (); | |
5816 | top = aexpr->bytes[pc++]; | |
5817 | top = (top << 8) + aexpr->bytes[pc++]; | |
5818 | emit_const (top); | |
5819 | break; | |
5820 | ||
5821 | case gdb_agent_op_const32: | |
5822 | emit_stack_flush (); | |
5823 | top = aexpr->bytes[pc++]; | |
5824 | top = (top << 8) + aexpr->bytes[pc++]; | |
5825 | top = (top << 8) + aexpr->bytes[pc++]; | |
5826 | top = (top << 8) + aexpr->bytes[pc++]; | |
5827 | emit_const (top); | |
5828 | break; | |
5829 | ||
5830 | case gdb_agent_op_const64: | |
5831 | emit_stack_flush (); | |
5832 | top = aexpr->bytes[pc++]; | |
5833 | top = (top << 8) + aexpr->bytes[pc++]; | |
5834 | top = (top << 8) + aexpr->bytes[pc++]; | |
5835 | top = (top << 8) + aexpr->bytes[pc++]; | |
5836 | top = (top << 8) + aexpr->bytes[pc++]; | |
5837 | top = (top << 8) + aexpr->bytes[pc++]; | |
5838 | top = (top << 8) + aexpr->bytes[pc++]; | |
5839 | top = (top << 8) + aexpr->bytes[pc++]; | |
5840 | emit_const (top); | |
5841 | break; | |
5842 | ||
5843 | case gdb_agent_op_reg: | |
5844 | emit_stack_flush (); | |
5845 | arg = aexpr->bytes[pc++]; | |
5846 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
5847 | emit_reg (arg); | |
5848 | break; | |
5849 | ||
5850 | case gdb_agent_op_end: | |
5851 | trace_debug ("At end of expression\n"); | |
5852 | ||
5853 | /* Assume there is one stack element left, and that it is | |
5854 | cached in "top" where emit_epilogue can get to it. */ | |
5855 | emit_stack_adjust (1); | |
5856 | ||
5857 | done = 1; | |
5858 | break; | |
5859 | ||
5860 | case gdb_agent_op_dup: | |
5861 | /* In our design, dup is equivalent to stack flushing. */ | |
5862 | emit_stack_flush (); | |
5863 | break; | |
5864 | ||
5865 | case gdb_agent_op_pop: | |
5866 | emit_pop (); | |
5867 | break; | |
5868 | ||
5869 | case gdb_agent_op_zero_ext: | |
5870 | arg = aexpr->bytes[pc++]; | |
5871 | if (arg < (sizeof (LONGEST) * 8)) | |
5872 | emit_zero_ext (arg); | |
5873 | break; | |
5874 | ||
5875 | case gdb_agent_op_swap: | |
5876 | emit_swap (); | |
5877 | break; | |
5878 | ||
5879 | case gdb_agent_op_getv: | |
5880 | emit_stack_flush (); | |
5881 | arg = aexpr->bytes[pc++]; | |
5882 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
5883 | emit_int_call_1 (ipa_sym_addrs.addr_get_trace_state_variable_value, | |
5884 | arg); | |
5885 | break; | |
5886 | ||
5887 | case gdb_agent_op_setv: | |
5888 | arg = aexpr->bytes[pc++]; | |
5889 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
5890 | emit_void_call_2 (ipa_sym_addrs.addr_set_trace_state_variable_value, | |
5891 | arg); | |
5892 | break; | |
5893 | ||
5894 | case gdb_agent_op_tracev: | |
5895 | UNHANDLED; | |
5896 | break; | |
5897 | ||
5898 | /* GDB never (currently) generates any of these ops. */ | |
5899 | case gdb_agent_op_float: | |
5900 | case gdb_agent_op_ref_float: | |
5901 | case gdb_agent_op_ref_double: | |
5902 | case gdb_agent_op_ref_long_double: | |
5903 | case gdb_agent_op_l_to_d: | |
5904 | case gdb_agent_op_d_to_l: | |
5905 | case gdb_agent_op_trace16: | |
5906 | UNHANDLED; | |
5907 | break; | |
5908 | ||
5909 | default: | |
5910 | trace_debug ("Agent expression op 0x%x not recognized\n", op); | |
5911 | /* Don't struggle on, things will just get worse. */ | |
5912 | return expr_eval_unrecognized_opcode; | |
5913 | } | |
5914 | ||
5915 | /* This catches errors that occur in target-specific code | |
5916 | emission. */ | |
5917 | if (emit_error) | |
5918 | { | |
5919 | trace_debug ("Error %d while emitting code for %s\n", | |
94d5e490 | 5920 | emit_error, gdb_agent_op_name (op)); |
6a271cae PA |
5921 | return expr_eval_unhandled_opcode; |
5922 | } | |
5923 | ||
94d5e490 | 5924 | trace_debug ("Op %s compiled\n", gdb_agent_op_name (op)); |
6a271cae PA |
5925 | } |
5926 | ||
5927 | /* Now fill in real addresses as goto destinations. */ | |
5928 | for (aentry = bytecode_address_table; aentry; aentry = aentry->next) | |
5929 | { | |
5930 | int written = 0; | |
5931 | ||
5932 | if (aentry->goto_pc < 0) | |
5933 | continue; | |
5934 | ||
5935 | /* Find the location that we are going to, and call back into | |
5936 | target-specific code to write the actual address or | |
5937 | displacement. */ | |
5938 | for (aentry2 = bytecode_address_table; aentry2; aentry2 = aentry2->next) | |
5939 | { | |
5940 | if (aentry2->pc == aentry->goto_pc) | |
5941 | { | |
5942 | trace_debug ("Want to jump from %s to %s\n", | |
5943 | paddress (aentry->address), | |
5944 | paddress (aentry2->address)); | |
5945 | write_goto_address (aentry->address + aentry->from_offset, | |
5946 | aentry2->address, aentry->from_size); | |
5947 | written = 1; | |
5948 | break; | |
5949 | } | |
5950 | } | |
5951 | ||
5952 | /* Error out if we didn't find a destination. */ | |
5953 | if (!written) | |
5954 | { | |
5955 | trace_debug ("Destination of goto %d not found\n", | |
5956 | aentry->goto_pc); | |
5957 | return expr_eval_invalid_goto; | |
5958 | } | |
5959 | } | |
5960 | ||
5961 | return expr_eval_no_error; | |
5962 | } | |
5963 | ||
fa593d66 PA |
5964 | /* We'll need to adjust these when we consider bi-arch setups, and big |
5965 | endian machines. */ | |
5966 | ||
5967 | static int | |
5968 | write_inferior_data_ptr (CORE_ADDR where, CORE_ADDR ptr) | |
5969 | { | |
5970 | return write_inferior_memory (where, | |
5971 | (unsigned char *) &ptr, sizeof (void *)); | |
5972 | } | |
5973 | ||
5974 | /* The base pointer of the IPA's heap. This is the only memory the | |
5975 | IPA is allowed to use. The IPA should _not_ call the inferior's | |
5976 | `malloc' during operation. That'd be slow, and, most importantly, | |
5977 | it may not be safe. We may be collecting a tracepoint in a signal | |
5978 | handler, for example. */ | |
5979 | static CORE_ADDR target_tp_heap; | |
5980 | ||
5981 | /* Allocate at least SIZE bytes of memory from the IPA heap, aligned | |
5982 | to 8 bytes. */ | |
5983 | ||
5984 | static CORE_ADDR | |
5985 | target_malloc (ULONGEST size) | |
5986 | { | |
5987 | CORE_ADDR ptr; | |
5988 | ||
5989 | if (target_tp_heap == 0) | |
5990 | { | |
5991 | /* We have the pointer *address*, need what it points to. */ | |
5992 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_tp_heap_buffer, | |
5993 | &target_tp_heap)) | |
5994 | fatal ("could get target heap head pointer"); | |
5995 | } | |
5996 | ||
5997 | ptr = target_tp_heap; | |
5998 | target_tp_heap += size; | |
5999 | ||
6000 | /* Pad to 8-byte alignment. */ | |
6001 | target_tp_heap = ((target_tp_heap + 7) & ~0x7); | |
6002 | ||
6003 | return ptr; | |
6004 | } | |
6005 | ||
6006 | static CORE_ADDR | |
6007 | download_agent_expr (struct agent_expr *expr) | |
6008 | { | |
6009 | CORE_ADDR expr_addr; | |
6010 | CORE_ADDR expr_bytes; | |
6011 | ||
6012 | expr_addr = target_malloc (sizeof (*expr)); | |
6013 | write_inferior_memory (expr_addr, (unsigned char *) expr, sizeof (*expr)); | |
6014 | ||
6015 | expr_bytes = target_malloc (expr->length); | |
6016 | write_inferior_data_ptr (expr_addr + offsetof (struct agent_expr, bytes), | |
6017 | expr_bytes); | |
6018 | write_inferior_memory (expr_bytes, expr->bytes, expr->length); | |
6019 | ||
6020 | return expr_addr; | |
6021 | } | |
6022 | ||
6023 | /* Align V up to N bits. */ | |
6024 | #define UALIGN(V, N) (((V) + ((N) - 1)) & ~((N) - 1)) | |
6025 | ||
6026 | static void | |
6027 | download_tracepoints (void) | |
6028 | { | |
6029 | CORE_ADDR tpptr = 0, prev_tpptr = 0; | |
6030 | struct tracepoint *tpoint; | |
6031 | ||
6032 | /* Start out empty. */ | |
6033 | write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints, 0); | |
6034 | ||
6035 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
6036 | { | |
6037 | struct tracepoint target_tracepoint; | |
6038 | ||
0fb4aa4b PA |
6039 | if (tpoint->type != fast_tracepoint |
6040 | && tpoint->type != static_tracepoint) | |
fa593d66 PA |
6041 | continue; |
6042 | ||
6a271cae PA |
6043 | /* Maybe download a compiled condition. */ |
6044 | if (tpoint->cond != NULL && target_emit_ops () != NULL) | |
6045 | { | |
6046 | CORE_ADDR jentry, jump_entry; | |
6047 | ||
6048 | jentry = jump_entry = get_jump_space_head (); | |
6049 | ||
6050 | if (tpoint->cond != NULL) | |
6051 | { | |
6052 | /* Pad to 8-byte alignment. (needed?) */ | |
6053 | /* Actually this should be left for the target to | |
6054 | decide. */ | |
6055 | jentry = UALIGN (jentry, 8); | |
6056 | ||
6057 | compile_tracepoint_condition (tpoint, &jentry); | |
6058 | } | |
6059 | ||
6060 | /* Pad to 8-byte alignment. */ | |
6061 | jentry = UALIGN (jentry, 8); | |
6062 | claim_jump_space (jentry - jump_entry); | |
6063 | } | |
6064 | ||
fa593d66 PA |
6065 | target_tracepoint = *tpoint; |
6066 | ||
6067 | prev_tpptr = tpptr; | |
6068 | tpptr = target_malloc (sizeof (*tpoint)); | |
6069 | tpoint->obj_addr_on_target = tpptr; | |
6070 | ||
6071 | if (tpoint == tracepoints) | |
6072 | { | |
6073 | /* First object in list, set the head pointer in the | |
6074 | inferior. */ | |
6075 | write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints, tpptr); | |
6076 | } | |
6077 | else | |
6078 | { | |
6079 | write_inferior_data_ptr (prev_tpptr + offsetof (struct tracepoint, | |
6080 | next), | |
6081 | tpptr); | |
6082 | } | |
6083 | ||
6084 | /* Write the whole object. We'll fix up its pointers in a bit. | |
6085 | Assume no next for now. This is fixed up above on the next | |
6086 | iteration, if there's any. */ | |
6087 | target_tracepoint.next = NULL; | |
6088 | /* Need to clear this here too, since we're downloading the | |
6089 | tracepoints before clearing our own copy. */ | |
6090 | target_tracepoint.hit_count = 0; | |
6091 | ||
6092 | write_inferior_memory (tpptr, (unsigned char *) &target_tracepoint, | |
6093 | sizeof (target_tracepoint)); | |
6094 | ||
6095 | if (tpoint->cond) | |
6096 | write_inferior_data_ptr (tpptr + offsetof (struct tracepoint, | |
6097 | cond), | |
6098 | download_agent_expr (tpoint->cond)); | |
6099 | ||
6100 | if (tpoint->numactions) | |
6101 | { | |
6102 | int i; | |
6103 | CORE_ADDR actions_array; | |
6104 | ||
6105 | /* The pointers array. */ | |
6106 | actions_array | |
6107 | = target_malloc (sizeof (*tpoint->actions) * tpoint->numactions); | |
6108 | write_inferior_data_ptr (tpptr + offsetof (struct tracepoint, | |
6109 | actions), | |
6110 | actions_array); | |
6111 | ||
6112 | /* Now for each pointer, download the action. */ | |
6113 | for (i = 0; i < tpoint->numactions; i++) | |
6114 | { | |
6115 | CORE_ADDR ipa_action = 0; | |
6116 | struct tracepoint_action *action = tpoint->actions[i]; | |
6117 | ||
6118 | switch (action->type) | |
6119 | { | |
6120 | case 'M': | |
6121 | ipa_action | |
6122 | = target_malloc (sizeof (struct collect_memory_action)); | |
6123 | write_inferior_memory (ipa_action, | |
6124 | (unsigned char *) action, | |
6125 | sizeof (struct collect_memory_action)); | |
6126 | break; | |
6127 | case 'R': | |
6128 | ipa_action | |
6129 | = target_malloc (sizeof (struct collect_registers_action)); | |
6130 | write_inferior_memory (ipa_action, | |
6131 | (unsigned char *) action, | |
6132 | sizeof (struct collect_registers_action)); | |
6133 | break; | |
6134 | case 'X': | |
6135 | { | |
6136 | CORE_ADDR expr; | |
6137 | struct eval_expr_action *eaction | |
6138 | = (struct eval_expr_action *) action; | |
6139 | ||
6140 | ipa_action = target_malloc (sizeof (*eaction)); | |
6141 | write_inferior_memory (ipa_action, | |
6142 | (unsigned char *) eaction, | |
6143 | sizeof (*eaction)); | |
6144 | ||
6145 | expr = download_agent_expr (eaction->expr); | |
6146 | write_inferior_data_ptr | |
6147 | (ipa_action + offsetof (struct eval_expr_action, expr), | |
6148 | expr); | |
6149 | break; | |
6150 | } | |
0fb4aa4b PA |
6151 | case 'L': |
6152 | ipa_action = target_malloc | |
6153 | (sizeof (struct collect_static_trace_data_action)); | |
6154 | write_inferior_memory | |
6155 | (ipa_action, | |
6156 | (unsigned char *) action, | |
6157 | sizeof (struct collect_static_trace_data_action)); | |
6158 | break; | |
fa593d66 PA |
6159 | default: |
6160 | trace_debug ("unknown trace action '%c', ignoring", | |
6161 | action->type); | |
6162 | break; | |
6163 | } | |
6164 | ||
6165 | if (ipa_action != 0) | |
6166 | write_inferior_data_ptr | |
6167 | (actions_array + i * sizeof (sizeof (*tpoint->actions)), | |
6168 | ipa_action); | |
6169 | } | |
6170 | } | |
6171 | } | |
6172 | } | |
6173 | ||
6174 | static void | |
6175 | download_trace_state_variables (void) | |
6176 | { | |
6177 | CORE_ADDR ptr = 0, prev_ptr = 0; | |
6178 | struct trace_state_variable *tsv; | |
6179 | ||
6180 | /* Start out empty. */ | |
6181 | write_inferior_data_ptr (ipa_sym_addrs.addr_trace_state_variables, 0); | |
6182 | ||
6183 | for (tsv = trace_state_variables; tsv != NULL; tsv = tsv->next) | |
6184 | { | |
6185 | struct trace_state_variable target_tsv; | |
6186 | ||
6187 | /* TSV's with a getter have been initialized equally in both the | |
6188 | inferior and GDBserver. Skip them. */ | |
6189 | if (tsv->getter != NULL) | |
6190 | continue; | |
6191 | ||
6192 | target_tsv = *tsv; | |
6193 | ||
6194 | prev_ptr = ptr; | |
6195 | ptr = target_malloc (sizeof (*tsv)); | |
6196 | ||
6197 | if (tsv == trace_state_variables) | |
6198 | { | |
6199 | /* First object in list, set the head pointer in the | |
6200 | inferior. */ | |
6201 | ||
6202 | write_inferior_data_ptr (ipa_sym_addrs.addr_trace_state_variables, | |
6203 | ptr); | |
6204 | } | |
6205 | else | |
6206 | { | |
6207 | write_inferior_data_ptr (prev_ptr | |
6208 | + offsetof (struct trace_state_variable, | |
6209 | next), | |
6210 | ptr); | |
6211 | } | |
6212 | ||
6213 | /* Write the whole object. We'll fix up its pointers in a bit. | |
6214 | Assume no next, fixup when needed. */ | |
6215 | target_tsv.next = NULL; | |
6216 | ||
6217 | write_inferior_memory (ptr, (unsigned char *) &target_tsv, | |
6218 | sizeof (target_tsv)); | |
6219 | ||
6220 | if (tsv->name != NULL) | |
6221 | { | |
6222 | size_t size = strlen (tsv->name) + 1; | |
6223 | CORE_ADDR name_addr = target_malloc (size); | |
6224 | write_inferior_memory (name_addr, | |
6225 | (unsigned char *) tsv->name, size); | |
6226 | write_inferior_data_ptr (ptr | |
6227 | + offsetof (struct trace_state_variable, | |
6228 | name), | |
6229 | name_addr); | |
6230 | } | |
6231 | ||
6232 | if (tsv->getter != NULL) | |
6233 | { | |
6234 | fatal ("what to do with these?"); | |
6235 | } | |
6236 | } | |
6237 | ||
6238 | if (prev_ptr != 0) | |
6239 | { | |
6240 | /* Fixup the next pointer in the last item in the list. */ | |
493e2a69 MS |
6241 | write_inferior_data_ptr (prev_ptr |
6242 | + offsetof (struct trace_state_variable, | |
6243 | next), 0); | |
fa593d66 PA |
6244 | } |
6245 | } | |
6246 | ||
6247 | /* Upload complete trace frames out of the IP Agent's trace buffer | |
6248 | into GDBserver's trace buffer. This always uploads either all or | |
6249 | no trace frames. This is the counter part of | |
6250 | `trace_alloc_trace_buffer'. See its description of the atomic | |
6251 | synching mechanism. */ | |
6252 | ||
6253 | static void | |
6254 | upload_fast_traceframes (void) | |
6255 | { | |
6256 | unsigned int ipa_traceframe_read_count, ipa_traceframe_write_count; | |
6257 | unsigned int ipa_traceframe_read_count_racy, ipa_traceframe_write_count_racy; | |
6258 | CORE_ADDR tf; | |
6259 | struct ipa_trace_buffer_control ipa_trace_buffer_ctrl; | |
6260 | unsigned int curr_tbctrl_idx; | |
6261 | unsigned int ipa_trace_buffer_ctrl_curr; | |
6262 | unsigned int ipa_trace_buffer_ctrl_curr_old; | |
6263 | CORE_ADDR ipa_trace_buffer_ctrl_addr; | |
6264 | struct breakpoint *about_to_request_buffer_space_bkpt; | |
6265 | CORE_ADDR ipa_trace_buffer_lo; | |
6266 | CORE_ADDR ipa_trace_buffer_hi; | |
6267 | ||
6268 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, | |
6269 | &ipa_traceframe_read_count_racy)) | |
6270 | { | |
6271 | /* This will happen in most targets if the current thread is | |
6272 | running. */ | |
6273 | return; | |
6274 | } | |
6275 | ||
6276 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, | |
6277 | &ipa_traceframe_write_count_racy)) | |
6278 | return; | |
6279 | ||
6280 | trace_debug ("ipa_traceframe_count (racy area): %d (w=%d, r=%d)", | |
493e2a69 MS |
6281 | ipa_traceframe_write_count_racy |
6282 | - ipa_traceframe_read_count_racy, | |
6283 | ipa_traceframe_write_count_racy, | |
6284 | ipa_traceframe_read_count_racy); | |
fa593d66 PA |
6285 | |
6286 | if (ipa_traceframe_write_count_racy == ipa_traceframe_read_count_racy) | |
6287 | return; | |
6288 | ||
6289 | about_to_request_buffer_space_bkpt | |
6290 | = set_breakpoint_at (ipa_sym_addrs.addr_about_to_request_buffer_space, | |
6291 | NULL); | |
6292 | ||
6293 | if (read_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, | |
6294 | &ipa_trace_buffer_ctrl_curr)) | |
6295 | return; | |
6296 | ||
6297 | ipa_trace_buffer_ctrl_curr_old = ipa_trace_buffer_ctrl_curr; | |
6298 | ||
6299 | curr_tbctrl_idx = ipa_trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK; | |
6300 | ||
6301 | { | |
6302 | unsigned int prev, counter; | |
6303 | ||
6304 | /* Update the token, with new counters, and the GDBserver stamp | |
6305 | bit. Alway reuse the current TBC index. */ | |
6306 | prev = ipa_trace_buffer_ctrl_curr & 0x0007ff00; | |
6307 | counter = (prev + 0x100) & 0x0007ff00; | |
6308 | ||
6309 | ipa_trace_buffer_ctrl_curr = (0x80000000 | |
6310 | | (prev << 12) | |
6311 | | counter | |
6312 | | curr_tbctrl_idx); | |
6313 | } | |
6314 | ||
6315 | if (write_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, | |
6316 | ipa_trace_buffer_ctrl_curr)) | |
6317 | return; | |
6318 | ||
6319 | trace_debug ("Lib: Committed %08x -> %08x", | |
6320 | ipa_trace_buffer_ctrl_curr_old, | |
6321 | ipa_trace_buffer_ctrl_curr); | |
6322 | ||
6323 | /* Re-read these, now that we've installed the | |
6324 | `about_to_request_buffer_space' breakpoint/lock. A thread could | |
6325 | have finished a traceframe between the last read of these | |
6326 | counters and setting the breakpoint above. If we start | |
6327 | uploading, we never want to leave this function with | |
6328 | traceframe_read_count != 0, otherwise, GDBserver could end up | |
6329 | incrementing the counter tokens more than once (due to event loop | |
6330 | nesting), which would break the IP agent's "effective" detection | |
6331 | (see trace_alloc_trace_buffer). */ | |
6332 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, | |
6333 | &ipa_traceframe_read_count)) | |
6334 | return; | |
6335 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, | |
6336 | &ipa_traceframe_write_count)) | |
6337 | return; | |
6338 | ||
6339 | if (debug_threads) | |
6340 | { | |
6341 | trace_debug ("ipa_traceframe_count (blocked area): %d (w=%d, r=%d)", | |
6342 | ipa_traceframe_write_count - ipa_traceframe_read_count, | |
6343 | ipa_traceframe_write_count, ipa_traceframe_read_count); | |
6344 | ||
6345 | if (ipa_traceframe_write_count != ipa_traceframe_write_count_racy | |
6346 | || ipa_traceframe_read_count != ipa_traceframe_read_count_racy) | |
6347 | trace_debug ("note that ipa_traceframe_count's parts changed"); | |
6348 | } | |
6349 | ||
6350 | /* Get the address of the current TBC object (the IP agent has an | |
6351 | array of 3 such objects). The index is stored in the TBC | |
6352 | token. */ | |
6353 | ipa_trace_buffer_ctrl_addr = ipa_sym_addrs.addr_trace_buffer_ctrl; | |
6354 | ipa_trace_buffer_ctrl_addr | |
6355 | += sizeof (struct ipa_trace_buffer_control) * curr_tbctrl_idx; | |
6356 | ||
6357 | if (read_inferior_memory (ipa_trace_buffer_ctrl_addr, | |
6358 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
6359 | sizeof (struct ipa_trace_buffer_control))) | |
6360 | return; | |
6361 | ||
6362 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_lo, | |
6363 | &ipa_trace_buffer_lo)) | |
6364 | return; | |
6365 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_hi, | |
6366 | &ipa_trace_buffer_hi)) | |
6367 | return; | |
6368 | ||
6369 | /* Offsets are easier to grok for debugging than raw addresses, | |
6370 | especially for the small trace buffer sizes that are useful for | |
6371 | testing. */ | |
6372 | trace_debug ("Lib: Trace buffer [%d] start=%d free=%d " | |
6373 | "endfree=%d wrap=%d hi=%d", | |
6374 | curr_tbctrl_idx, | |
6375 | (int) (ipa_trace_buffer_ctrl.start - ipa_trace_buffer_lo), | |
6376 | (int) (ipa_trace_buffer_ctrl.free - ipa_trace_buffer_lo), | |
6377 | (int) (ipa_trace_buffer_ctrl.end_free - ipa_trace_buffer_lo), | |
6378 | (int) (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo), | |
6379 | (int) (ipa_trace_buffer_hi - ipa_trace_buffer_lo)); | |
6380 | ||
6381 | /* Note that the IPA's buffer is always circular. */ | |
6382 | ||
6383 | #define IPA_FIRST_TRACEFRAME() (ipa_trace_buffer_ctrl.start) | |
6384 | ||
6385 | #define IPA_NEXT_TRACEFRAME_1(TF, TFOBJ) \ | |
6386 | ((TF) + sizeof (struct traceframe) + (TFOBJ)->data_size) | |
6387 | ||
6388 | #define IPA_NEXT_TRACEFRAME(TF, TFOBJ) \ | |
6389 | (IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) \ | |
6390 | - ((IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) >= ipa_trace_buffer_ctrl.wrap) \ | |
6391 | ? (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo) \ | |
6392 | : 0)) | |
6393 | ||
6394 | tf = IPA_FIRST_TRACEFRAME (); | |
6395 | ||
6396 | while (ipa_traceframe_write_count - ipa_traceframe_read_count) | |
6397 | { | |
6398 | struct tracepoint *tpoint; | |
6399 | struct traceframe *tframe; | |
6400 | unsigned char *block; | |
6401 | struct traceframe ipa_tframe; | |
6402 | ||
6403 | if (read_inferior_memory (tf, (unsigned char *) &ipa_tframe, | |
6404 | offsetof (struct traceframe, data))) | |
6405 | error ("Uploading: couldn't read traceframe at %s\n", paddress (tf)); | |
6406 | ||
6407 | if (ipa_tframe.tpnum == 0) | |
6408 | fatal ("Uploading: No (more) fast traceframes, but " | |
6409 | "ipa_traceframe_count == %u??\n", | |
6410 | ipa_traceframe_write_count - ipa_traceframe_read_count); | |
6411 | ||
6412 | /* Note that this will be incorrect for multi-location | |
6413 | tracepoints... */ | |
6414 | tpoint = find_next_tracepoint_by_number (NULL, ipa_tframe.tpnum); | |
6415 | ||
6416 | tframe = add_traceframe (tpoint); | |
6417 | if (tframe == NULL) | |
6418 | { | |
6419 | trace_buffer_is_full = 1; | |
6420 | trace_debug ("Uploading: trace buffer is full"); | |
6421 | } | |
6422 | else | |
6423 | { | |
6424 | /* Copy the whole set of blocks in one go for now. FIXME: | |
6425 | split this in smaller blocks. */ | |
6426 | block = add_traceframe_block (tframe, ipa_tframe.data_size); | |
6427 | if (block != NULL) | |
6428 | { | |
493e2a69 MS |
6429 | if (read_inferior_memory (tf |
6430 | + offsetof (struct traceframe, data), | |
fa593d66 PA |
6431 | block, ipa_tframe.data_size)) |
6432 | error ("Uploading: Couldn't read traceframe data at %s\n", | |
6433 | paddress (tf + offsetof (struct traceframe, data))); | |
6434 | } | |
6435 | ||
6436 | trace_debug ("Uploading: traceframe didn't fit"); | |
6437 | finish_traceframe (tframe); | |
6438 | } | |
6439 | ||
6440 | tf = IPA_NEXT_TRACEFRAME (tf, &ipa_tframe); | |
6441 | ||
6442 | /* If we freed the traceframe that wrapped around, go back | |
6443 | to the non-wrap case. */ | |
6444 | if (tf < ipa_trace_buffer_ctrl.start) | |
6445 | { | |
6446 | trace_debug ("Lib: Discarding past the wraparound"); | |
6447 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
6448 | } | |
6449 | ipa_trace_buffer_ctrl.start = tf; | |
6450 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_ctrl.start; | |
6451 | ++ipa_traceframe_read_count; | |
6452 | ||
6453 | if (ipa_trace_buffer_ctrl.start == ipa_trace_buffer_ctrl.free | |
6454 | && ipa_trace_buffer_ctrl.start == ipa_trace_buffer_ctrl.end_free) | |
6455 | { | |
6456 | trace_debug ("Lib: buffer is fully empty. " | |
6457 | "Trace buffer [%d] start=%d free=%d endfree=%d", | |
6458 | curr_tbctrl_idx, | |
6459 | (int) (ipa_trace_buffer_ctrl.start | |
6460 | - ipa_trace_buffer_lo), | |
6461 | (int) (ipa_trace_buffer_ctrl.free | |
6462 | - ipa_trace_buffer_lo), | |
6463 | (int) (ipa_trace_buffer_ctrl.end_free | |
6464 | - ipa_trace_buffer_lo)); | |
6465 | ||
6466 | ipa_trace_buffer_ctrl.start = ipa_trace_buffer_lo; | |
6467 | ipa_trace_buffer_ctrl.free = ipa_trace_buffer_lo; | |
6468 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_hi; | |
6469 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
6470 | } | |
6471 | ||
6472 | trace_debug ("Uploaded a traceframe\n" | |
6473 | "Lib: Trace buffer [%d] start=%d free=%d " | |
6474 | "endfree=%d wrap=%d hi=%d", | |
6475 | curr_tbctrl_idx, | |
6476 | (int) (ipa_trace_buffer_ctrl.start - ipa_trace_buffer_lo), | |
6477 | (int) (ipa_trace_buffer_ctrl.free - ipa_trace_buffer_lo), | |
493e2a69 MS |
6478 | (int) (ipa_trace_buffer_ctrl.end_free |
6479 | - ipa_trace_buffer_lo), | |
fa593d66 PA |
6480 | (int) (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo), |
6481 | (int) (ipa_trace_buffer_hi - ipa_trace_buffer_lo)); | |
6482 | } | |
6483 | ||
6484 | if (write_inferior_memory (ipa_trace_buffer_ctrl_addr, | |
6485 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
6486 | sizeof (struct ipa_trace_buffer_control))) | |
6487 | return; | |
6488 | ||
6489 | write_inferior_integer (ipa_sym_addrs.addr_traceframe_read_count, | |
6490 | ipa_traceframe_read_count); | |
6491 | ||
6492 | trace_debug ("Done uploading traceframes [%d]\n", curr_tbctrl_idx); | |
6493 | ||
6494 | pause_all (1); | |
6495 | cancel_breakpoints (); | |
6496 | ||
6497 | delete_breakpoint (about_to_request_buffer_space_bkpt); | |
6498 | about_to_request_buffer_space_bkpt = NULL; | |
6499 | ||
6500 | unpause_all (1); | |
6501 | ||
6502 | if (trace_buffer_is_full) | |
6503 | stop_tracing (); | |
6504 | } | |
6505 | #endif | |
6506 | ||
6507 | #ifdef IN_PROCESS_AGENT | |
6508 | ||
0fb4aa4b PA |
6509 | IP_AGENT_EXPORT int ust_loaded; |
6510 | IP_AGENT_EXPORT char cmd_buf[CMD_BUF_SIZE]; | |
fa593d66 | 6511 | |
0fb4aa4b | 6512 | #ifdef HAVE_UST |
fa593d66 | 6513 | |
0fb4aa4b PA |
6514 | /* Static tracepoints. */ |
6515 | ||
6516 | /* UST puts a "struct tracepoint" in the global namespace, which | |
6517 | conflicts with our tracepoint. Arguably, being a library, it | |
6518 | shouldn't take ownership of such a generic name. We work around it | |
6519 | here. */ | |
6520 | #define tracepoint ust_tracepoint | |
6521 | #include <ust/ust.h> | |
6522 | #undef tracepoint | |
6523 | ||
6524 | extern int serialize_to_text (char *outbuf, int bufsize, | |
6525 | const char *fmt, va_list ap); | |
6526 | ||
6527 | #define GDB_PROBE_NAME "gdb" | |
6528 | ||
6529 | /* We dynamically search for the UST symbols instead of linking them | |
6530 | in. This lets the user decide if the application uses static | |
6531 | tracepoints, instead of always pulling libust.so in. This vector | |
6532 | holds pointers to all functions we care about. */ | |
6533 | ||
6534 | static struct | |
fa593d66 | 6535 | { |
0fb4aa4b PA |
6536 | int (*serialize_to_text) (char *outbuf, int bufsize, |
6537 | const char *fmt, va_list ap); | |
6538 | ||
6539 | int (*ltt_probe_register) (struct ltt_available_probe *pdata); | |
6540 | int (*ltt_probe_unregister) (struct ltt_available_probe *pdata); | |
6541 | ||
6542 | int (*ltt_marker_connect) (const char *channel, const char *mname, | |
6543 | const char *pname); | |
6544 | int (*ltt_marker_disconnect) (const char *channel, const char *mname, | |
6545 | const char *pname); | |
6546 | ||
6547 | void (*marker_iter_start) (struct marker_iter *iter); | |
6548 | void (*marker_iter_next) (struct marker_iter *iter); | |
6549 | void (*marker_iter_stop) (struct marker_iter *iter); | |
6550 | void (*marker_iter_reset) (struct marker_iter *iter); | |
6551 | } ust_ops; | |
6552 | ||
6553 | #include <dlfcn.h> | |
6554 | ||
6555 | /* Cast through typeof to catch incompatible API changes. Since UST | |
6556 | only builds with gcc, we can freely use gcc extensions here | |
6557 | too. */ | |
6558 | #define GET_UST_SYM(SYM) \ | |
6559 | do \ | |
6560 | { \ | |
6561 | if (ust_ops.SYM == NULL) \ | |
6562 | ust_ops.SYM = (typeof (&SYM)) dlsym (RTLD_DEFAULT, #SYM); \ | |
6563 | if (ust_ops.SYM == NULL) \ | |
6564 | return 0; \ | |
6565 | } while (0) | |
6566 | ||
6567 | #define USTF(SYM) ust_ops.SYM | |
6568 | ||
6569 | /* Get pointers to all libust.so functions we care about. */ | |
6570 | ||
6571 | static int | |
6572 | dlsym_ust (void) | |
6573 | { | |
6574 | GET_UST_SYM (serialize_to_text); | |
6575 | ||
6576 | GET_UST_SYM (ltt_probe_register); | |
6577 | GET_UST_SYM (ltt_probe_unregister); | |
6578 | GET_UST_SYM (ltt_marker_connect); | |
6579 | GET_UST_SYM (ltt_marker_disconnect); | |
6580 | ||
6581 | GET_UST_SYM (marker_iter_start); | |
6582 | GET_UST_SYM (marker_iter_next); | |
6583 | GET_UST_SYM (marker_iter_stop); | |
6584 | GET_UST_SYM (marker_iter_reset); | |
6585 | ||
6586 | ust_loaded = 1; | |
6587 | return 1; | |
fa593d66 PA |
6588 | } |
6589 | ||
0fb4aa4b PA |
6590 | /* Given an UST marker, return the matching gdb static tracepoint. |
6591 | The match is done by address. */ | |
6592 | ||
6593 | static struct tracepoint * | |
6594 | ust_marker_to_static_tracepoint (const struct marker *mdata) | |
6595 | { | |
6596 | struct tracepoint *tpoint; | |
6597 | ||
6598 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
6599 | { | |
6600 | if (!tpoint->enabled || tpoint->type != static_tracepoint) | |
6601 | continue; | |
6602 | ||
6603 | if (tpoint->address == (uintptr_t) mdata->location) | |
6604 | return tpoint; | |
6605 | } | |
6606 | ||
6607 | return NULL; | |
6608 | } | |
6609 | ||
6610 | /* The probe function we install on lttng/ust markers. Whenever a | |
6611 | probed ust marker is hit, this function is called. This is similar | |
6612 | to gdb_collect, only for static tracepoints, instead of fast | |
6613 | tracepoints. */ | |
6614 | ||
6615 | static void | |
6616 | gdb_probe (const struct marker *mdata, void *probe_private, | |
6617 | struct registers *regs, void *call_private, | |
6618 | const char *fmt, va_list *args) | |
6619 | { | |
6620 | struct tracepoint *tpoint; | |
6621 | struct static_tracepoint_ctx ctx; | |
6622 | ||
6623 | /* Don't do anything until the trace run is completely set up. */ | |
6624 | if (!tracing) | |
6625 | { | |
6626 | trace_debug ("gdb_probe: not tracing\n"); | |
6627 | return; | |
6628 | } | |
6629 | ||
6630 | ctx.base.type = static_tracepoint; | |
6631 | ctx.regcache_initted = 0; | |
6632 | ctx.regs = regs; | |
6633 | ctx.fmt = fmt; | |
6634 | ctx.args = args; | |
6635 | ||
6636 | /* Wrap the regblock in a register cache (in the stack, we don't | |
6637 | want to malloc here). */ | |
6638 | ctx.regspace = alloca (register_cache_size ()); | |
6639 | if (ctx.regspace == NULL) | |
6640 | { | |
6641 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
6642 | return; | |
6643 | } | |
6644 | ||
6645 | tpoint = ust_marker_to_static_tracepoint (mdata); | |
6646 | if (tpoint == NULL) | |
6647 | { | |
6648 | trace_debug ("gdb_probe: marker not known: " | |
6649 | "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"", | |
6650 | mdata->location, mdata->channel, | |
6651 | mdata->name, mdata->format); | |
6652 | return; | |
6653 | } | |
6654 | ||
6655 | ctx.tpoint = tpoint; | |
6656 | ||
6657 | trace_debug ("gdb_probe: collecting marker: " | |
6658 | "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"", | |
6659 | mdata->location, mdata->channel, | |
6660 | mdata->name, mdata->format); | |
6661 | ||
6662 | /* Test the condition if present, and collect if true. */ | |
6663 | if (tpoint->cond == NULL | |
6664 | || condition_true_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
6665 | tpoint)) | |
6666 | { | |
6667 | collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
6668 | tpoint->address, tpoint); | |
6669 | ||
6670 | if (stopping_tracepoint | |
6671 | || trace_buffer_is_full | |
6672 | || expr_eval_result != expr_eval_no_error) | |
6673 | stop_tracing (); | |
6674 | } | |
6675 | else | |
6676 | { | |
6677 | /* If there was a condition and it evaluated to false, the only | |
6678 | way we would stop tracing is if there was an error during | |
6679 | condition expression evaluation. */ | |
6680 | if (expr_eval_result != expr_eval_no_error) | |
6681 | stop_tracing (); | |
6682 | } | |
6683 | } | |
6684 | ||
6685 | /* Called if the gdb static tracepoint requested collecting "$_sdata", | |
6686 | static tracepoint string data. This is a string passed to the | |
6687 | tracing library by the user, at the time of the tracepoint marker | |
6688 | call. E.g., in the UST marker call: | |
6689 | ||
6690 | trace_mark (ust, bar33, "str %s", "FOOBAZ"); | |
6691 | ||
6692 | the collected data is "str FOOBAZ". | |
6693 | */ | |
6694 | ||
6695 | static void | |
6696 | collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
6697 | CORE_ADDR stop_pc, | |
6698 | struct tracepoint *tpoint, | |
6699 | struct traceframe *tframe) | |
6700 | { | |
6701 | struct static_tracepoint_ctx *umd = (struct static_tracepoint_ctx *) ctx; | |
6702 | unsigned char *bufspace; | |
6703 | int size; | |
6704 | va_list copy; | |
6705 | unsigned short blocklen; | |
6706 | ||
6707 | if (umd == NULL) | |
6708 | { | |
6709 | trace_debug ("Wanted to collect static trace data, " | |
6710 | "but there's no static trace data"); | |
6711 | return; | |
6712 | } | |
6713 | ||
6714 | va_copy (copy, *umd->args); | |
6715 | size = USTF(serialize_to_text) (NULL, 0, umd->fmt, copy); | |
6716 | va_end (copy); | |
6717 | ||
6718 | trace_debug ("Want to collect ust data"); | |
6719 | ||
6720 | /* 'S' + size + string */ | |
6721 | bufspace = add_traceframe_block (tframe, | |
6722 | 1 + sizeof (blocklen) + size + 1); | |
6723 | if (bufspace == NULL) | |
6724 | { | |
6725 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
6726 | return; | |
6727 | } | |
6728 | ||
6729 | /* Identify a static trace data block. */ | |
6730 | *bufspace = 'S'; | |
6731 | ||
6732 | blocklen = size + 1; | |
6733 | memcpy (bufspace + 1, &blocklen, sizeof (blocklen)); | |
6734 | ||
6735 | va_copy (copy, *umd->args); | |
6736 | USTF(serialize_to_text) ((char *) bufspace + 1 + sizeof (blocklen), | |
6737 | size + 1, umd->fmt, copy); | |
6738 | va_end (copy); | |
6739 | ||
6740 | trace_debug ("Storing static tracepoint data in regblock: %s", | |
6741 | bufspace + 1 + sizeof (blocklen)); | |
6742 | } | |
6743 | ||
6744 | /* The probe to register with lttng/ust. */ | |
6745 | static struct ltt_available_probe gdb_ust_probe = | |
6746 | { | |
6747 | GDB_PROBE_NAME, | |
6748 | NULL, | |
6749 | gdb_probe, | |
6750 | }; | |
6751 | ||
6752 | #endif /* HAVE_UST */ | |
6753 | #endif /* IN_PROCESS_AGENT */ | |
6754 | ||
6755 | #ifdef HAVE_UST | |
6756 | ||
6757 | #include <sys/socket.h> | |
6758 | #include <sys/un.h> | |
6759 | ||
6760 | #ifndef UNIX_PATH_MAX | |
6761 | #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path) | |
6762 | #endif | |
6763 | ||
6764 | /* Where we put the socked used for synchronization. */ | |
6765 | #define SOCK_DIR P_tmpdir | |
6766 | ||
6767 | #endif /* HAVE_UST */ | |
6768 | ||
6769 | #ifndef IN_PROCESS_AGENT | |
6770 | ||
6771 | #ifdef HAVE_UST | |
6772 | ||
6773 | static int | |
6774 | gdb_ust_connect_sync_socket (int pid) | |
6775 | { | |
6776 | struct sockaddr_un addr; | |
6777 | int res, fd; | |
6778 | char path[UNIX_PATH_MAX]; | |
6779 | ||
6cebaf6e | 6780 | res = xsnprintf (path, UNIX_PATH_MAX, "%s/gdb_ust%d", SOCK_DIR, pid); |
0fb4aa4b PA |
6781 | if (res >= UNIX_PATH_MAX) |
6782 | { | |
6783 | trace_debug ("string overflow allocating socket name"); | |
6784 | return -1; | |
6785 | } | |
6786 | ||
6787 | res = fd = socket (PF_UNIX, SOCK_STREAM, 0); | |
6788 | if (res == -1) | |
6789 | { | |
6790 | warning ("error opening sync socket: %s\n", strerror (errno)); | |
6791 | return -1; | |
6792 | } | |
6793 | ||
6794 | addr.sun_family = AF_UNIX; | |
6795 | ||
6cebaf6e | 6796 | res = xsnprintf (addr.sun_path, UNIX_PATH_MAX, "%s", path); |
0fb4aa4b PA |
6797 | if (res >= UNIX_PATH_MAX) |
6798 | { | |
6799 | warning ("string overflow allocating socket name\n"); | |
6800 | close (fd); | |
6801 | return -1; | |
6802 | } | |
6803 | ||
6804 | res = connect (fd, (struct sockaddr *) &addr, sizeof (addr)); | |
6805 | if (res == -1) | |
6806 | { | |
6807 | warning ("error connecting sync socket (%s): %s. " | |
6808 | "Make sure the directory exists and that it is writable.", | |
6809 | path, strerror (errno)); | |
6810 | close (fd); | |
6811 | return -1; | |
6812 | } | |
6813 | ||
6814 | return fd; | |
6815 | } | |
6816 | ||
6817 | /* Resume thread PTID. */ | |
6818 | ||
6819 | static void | |
6820 | resume_thread (ptid_t ptid) | |
6821 | { | |
6822 | struct thread_resume resume_info; | |
6823 | ||
6824 | resume_info.thread = ptid; | |
6825 | resume_info.kind = resume_continue; | |
6826 | resume_info.sig = TARGET_SIGNAL_0; | |
6827 | (*the_target->resume) (&resume_info, 1); | |
6828 | } | |
6829 | ||
6830 | /* Stop thread PTID. */ | |
6831 | ||
6832 | static void | |
6833 | stop_thread (ptid_t ptid) | |
6834 | { | |
6835 | struct thread_resume resume_info; | |
6836 | ||
6837 | resume_info.thread = ptid; | |
6838 | resume_info.kind = resume_stop; | |
6839 | resume_info.sig = TARGET_SIGNAL_0; | |
6840 | (*the_target->resume) (&resume_info, 1); | |
6841 | } | |
6842 | ||
6843 | /* Ask the in-process agent to run a command. Since we don't want to | |
6844 | have to handle the IPA hitting breakpoints while running the | |
6845 | command, we pause all threads, remove all breakpoints, and then set | |
6846 | the helper thread re-running. We communicate with the helper | |
6847 | thread by means of direct memory xfering, and a socket for | |
6848 | synchronization. */ | |
6849 | ||
6850 | static int | |
6851 | run_inferior_command (char *cmd) | |
6852 | { | |
6853 | int err = -1; | |
6854 | int fd = -1; | |
6855 | int pid = ptid_get_pid (current_inferior->entry.id); | |
6856 | int tid; | |
6857 | ptid_t ptid = null_ptid; | |
6858 | ||
6859 | trace_debug ("run_inferior_command: running: %s", cmd); | |
6860 | ||
6861 | pause_all (0); | |
6862 | uninsert_all_breakpoints (); | |
6863 | ||
6864 | if (read_inferior_integer (ipa_sym_addrs.addr_helper_thread_id, &tid)) | |
6865 | { | |
6866 | warning ("Error reading helper thread's id in lib"); | |
6867 | goto out; | |
6868 | } | |
6869 | ||
6870 | if (tid == 0) | |
6871 | { | |
6872 | warning ("helper thread not initialized yet"); | |
6873 | goto out; | |
6874 | } | |
6875 | ||
6876 | if (write_inferior_memory (ipa_sym_addrs.addr_cmd_buf, | |
6877 | (unsigned char *) cmd, strlen (cmd) + 1)) | |
6878 | { | |
6879 | warning ("Error writing command"); | |
6880 | goto out; | |
6881 | } | |
6882 | ||
6883 | ptid = ptid_build (pid, tid, 0); | |
6884 | ||
6885 | resume_thread (ptid); | |
6886 | ||
6887 | fd = gdb_ust_connect_sync_socket (pid); | |
6888 | if (fd >= 0) | |
6889 | { | |
6890 | char buf[1] = ""; | |
6891 | int ret; | |
6892 | ||
6893 | trace_debug ("signalling helper thread"); | |
6894 | ||
6895 | do | |
6896 | { | |
6897 | ret = write (fd, buf, 1); | |
6898 | } while (ret == -1 && errno == EINTR); | |
6899 | ||
6900 | trace_debug ("waiting for helper thread's response"); | |
6901 | ||
6902 | do | |
6903 | { | |
6904 | ret = read (fd, buf, 1); | |
6905 | } while (ret == -1 && errno == EINTR); | |
6906 | ||
6907 | close (fd); | |
6908 | ||
6909 | trace_debug ("helper thread's response received"); | |
6910 | } | |
6911 | ||
6912 | out: | |
6913 | ||
6914 | /* Need to read response with the inferior stopped. */ | |
6915 | if (!ptid_equal (ptid, null_ptid)) | |
6916 | { | |
6917 | int was_non_stop = non_stop; | |
6918 | struct target_waitstatus status; | |
6919 | ||
6920 | stop_thread (ptid); | |
6921 | non_stop = 1; | |
6922 | mywait (ptid, &status, 0, 0); | |
6923 | non_stop = was_non_stop; | |
6924 | } | |
6925 | ||
6926 | if (fd >= 0) | |
6927 | { | |
6928 | if (read_inferior_memory (ipa_sym_addrs.addr_cmd_buf, | |
6929 | (unsigned char *) cmd, CMD_BUF_SIZE)) | |
6930 | { | |
6931 | warning ("Error reading command response"); | |
6932 | } | |
6933 | else | |
6934 | { | |
6935 | err = 0; | |
6936 | trace_debug ("run_inferior_command: response: %s", cmd); | |
6937 | } | |
6938 | } | |
6939 | ||
6940 | reinsert_all_breakpoints (); | |
6941 | unpause_all (0); | |
6942 | ||
6943 | return err; | |
6944 | } | |
6945 | ||
6946 | #else /* HAVE_UST */ | |
6947 | ||
6948 | static int | |
6949 | run_inferior_command (char *cmd) | |
6950 | { | |
6951 | return -1; | |
6952 | } | |
6953 | ||
6954 | #endif /* HAVE_UST */ | |
6955 | ||
6956 | #else /* !IN_PROCESS_AGENT */ | |
6957 | ||
6958 | /* Thread ID of the helper thread. GDBserver reads this to know which | |
6959 | is the help thread. This is an LWP id on Linux. */ | |
6960 | int helper_thread_id; | |
6961 | ||
6962 | #ifdef HAVE_UST | |
6963 | ||
6964 | static int | |
6965 | init_named_socket (const char *name) | |
6966 | { | |
6967 | int result, fd; | |
6968 | struct sockaddr_un addr; | |
6969 | ||
6970 | result = fd = socket (PF_UNIX, SOCK_STREAM, 0); | |
6971 | if (result == -1) | |
6972 | { | |
6973 | warning ("socket creation failed: %s", strerror (errno)); | |
6974 | return -1; | |
6975 | } | |
6976 | ||
6977 | addr.sun_family = AF_UNIX; | |
6978 | ||
6979 | strncpy (addr.sun_path, name, UNIX_PATH_MAX); | |
6980 | addr.sun_path[UNIX_PATH_MAX - 1] = '\0'; | |
6981 | ||
6982 | result = access (name, F_OK); | |
6983 | if (result == 0) | |
6984 | { | |
6985 | /* File exists. */ | |
6986 | result = unlink (name); | |
6987 | if (result == -1) | |
6988 | { | |
6989 | warning ("unlink failed: %s", strerror (errno)); | |
6990 | close (fd); | |
6991 | return -1; | |
6992 | } | |
6993 | warning ("socket %s already exists; overwriting", name); | |
6994 | } | |
6995 | ||
6996 | result = bind (fd, (struct sockaddr *) &addr, sizeof (addr)); | |
6997 | if (result == -1) | |
6998 | { | |
6999 | warning ("bind failed: %s", strerror (errno)); | |
7000 | close (fd); | |
7001 | return -1; | |
7002 | } | |
7003 | ||
7004 | result = listen (fd, 1); | |
7005 | if (result == -1) | |
7006 | { | |
7007 | warning ("listen: %s", strerror (errno)); | |
7008 | close (fd); | |
7009 | return -1; | |
7010 | } | |
7011 | ||
7012 | return fd; | |
7013 | } | |
7014 | ||
7015 | static int | |
7016 | gdb_ust_socket_init (void) | |
7017 | { | |
7018 | int result, fd; | |
7019 | char name[UNIX_PATH_MAX]; | |
7020 | ||
6cebaf6e | 7021 | result = xsnprintf (name, UNIX_PATH_MAX, "%s/gdb_ust%d", |
7022 | SOCK_DIR, getpid ()); | |
0fb4aa4b PA |
7023 | if (result >= UNIX_PATH_MAX) |
7024 | { | |
7025 | trace_debug ("string overflow allocating socket name"); | |
7026 | return -1; | |
7027 | } | |
7028 | ||
7029 | fd = init_named_socket (name); | |
7030 | if (fd < 0) | |
7031 | warning ("Error initializing named socket (%s) for communication with the " | |
7032 | "ust helper thread. Check that directory exists and that it " | |
7033 | "is writable.", name); | |
7034 | ||
7035 | return fd; | |
7036 | } | |
7037 | ||
7038 | /* Return an hexstr version of the STR C string, fit for sending to | |
7039 | GDB. */ | |
7040 | ||
7041 | static char * | |
7042 | cstr_to_hexstr (const char *str) | |
7043 | { | |
7044 | int len = strlen (str); | |
7045 | char *hexstr = xmalloc (len * 2 + 1); | |
7046 | convert_int_to_ascii ((gdb_byte *) str, hexstr, len); | |
7047 | return hexstr; | |
7048 | } | |
7049 | ||
7050 | /* The next marker to be returned on a qTsSTM command. */ | |
7051 | static const struct marker *next_st; | |
7052 | ||
7053 | /* Returns the first known marker. */ | |
7054 | ||
7055 | struct marker * | |
7056 | first_marker (void) | |
7057 | { | |
7058 | struct marker_iter iter; | |
7059 | ||
7060 | USTF(marker_iter_reset) (&iter); | |
7061 | USTF(marker_iter_start) (&iter); | |
7062 | ||
7063 | return iter.marker; | |
7064 | } | |
7065 | ||
7066 | /* Returns the marker following M. */ | |
7067 | ||
7068 | const struct marker * | |
7069 | next_marker (const struct marker *m) | |
7070 | { | |
7071 | struct marker_iter iter; | |
7072 | ||
7073 | USTF(marker_iter_reset) (&iter); | |
7074 | USTF(marker_iter_start) (&iter); | |
7075 | ||
7076 | for (; iter.marker != NULL; USTF(marker_iter_next) (&iter)) | |
7077 | { | |
7078 | if (iter.marker == m) | |
7079 | { | |
7080 | USTF(marker_iter_next) (&iter); | |
7081 | return iter.marker; | |
7082 | } | |
7083 | } | |
7084 | ||
7085 | return NULL; | |
7086 | } | |
7087 | ||
7088 | /* Compose packet that is the response to the qTsSTM/qTfSTM/qTSTMat | |
7089 | packets. */ | |
7090 | ||
7091 | static void | |
7092 | response_ust_marker (char *packet, const struct marker *st) | |
7093 | { | |
7094 | char *strid, *format, *tmp; | |
7095 | ||
7096 | next_st = next_marker (st); | |
7097 | ||
7098 | tmp = xmalloc (strlen (st->channel) + 1 + | |
7099 | strlen (st->name) + 1); | |
7100 | sprintf (tmp, "%s/%s", st->channel, st->name); | |
7101 | ||
7102 | strid = cstr_to_hexstr (tmp); | |
7103 | free (tmp); | |
7104 | ||
7105 | format = cstr_to_hexstr (st->format); | |
7106 | ||
7107 | sprintf (packet, "m%s:%s:%s", | |
7108 | paddress ((uintptr_t) st->location), | |
7109 | strid, | |
7110 | format); | |
7111 | ||
7112 | free (strid); | |
7113 | free (format); | |
7114 | } | |
7115 | ||
7116 | /* Return the first static tracepoint, and initialize the state | |
7117 | machine that will iterate through all the static tracepoints. */ | |
7118 | ||
7119 | static void | |
7120 | cmd_qtfstm (char *packet) | |
7121 | { | |
7122 | trace_debug ("Returning first trace state variable definition"); | |
7123 | ||
7124 | if (first_marker ()) | |
7125 | response_ust_marker (packet, first_marker ()); | |
7126 | else | |
7127 | strcpy (packet, "l"); | |
7128 | } | |
7129 | ||
7130 | /* Return additional trace state variable definitions. */ | |
7131 | ||
7132 | static void | |
7133 | cmd_qtsstm (char *packet) | |
7134 | { | |
7135 | trace_debug ("Returning static tracepoint"); | |
7136 | ||
7137 | if (next_st) | |
7138 | response_ust_marker (packet, next_st); | |
7139 | else | |
7140 | strcpy (packet, "l"); | |
7141 | } | |
7142 | ||
7143 | /* Disconnect the GDB probe from a marker at a given address. */ | |
7144 | ||
7145 | static void | |
7146 | unprobe_marker_at (char *packet) | |
7147 | { | |
7148 | char *p = packet; | |
7149 | ULONGEST address; | |
7150 | struct marker_iter iter; | |
7151 | ||
7152 | p += sizeof ("unprobe_marker_at:") - 1; | |
7153 | ||
7154 | p = unpack_varlen_hex (p, &address); | |
7155 | ||
7156 | USTF(marker_iter_reset) (&iter); | |
7157 | USTF(marker_iter_start) (&iter); | |
7158 | for (; iter.marker != NULL; USTF(marker_iter_next) (&iter)) | |
7159 | if ((uintptr_t ) iter.marker->location == address) | |
7160 | { | |
7161 | int result; | |
7162 | ||
7163 | result = USTF(ltt_marker_disconnect) (iter.marker->channel, | |
7164 | iter.marker->name, | |
7165 | GDB_PROBE_NAME); | |
7166 | if (result < 0) | |
7167 | warning ("could not disable marker %s/%s", | |
7168 | iter.marker->channel, iter.marker->name); | |
7169 | break; | |
7170 | } | |
7171 | } | |
7172 | ||
7173 | /* Connect the GDB probe to a marker at a given address. */ | |
7174 | ||
7175 | static int | |
7176 | probe_marker_at (char *packet) | |
7177 | { | |
7178 | char *p = packet; | |
7179 | ULONGEST address; | |
7180 | struct marker_iter iter; | |
7181 | struct marker *m; | |
7182 | ||
7183 | p += sizeof ("probe_marker_at:") - 1; | |
7184 | ||
7185 | p = unpack_varlen_hex (p, &address); | |
7186 | ||
7187 | USTF(marker_iter_reset) (&iter); | |
7188 | ||
7189 | for (USTF(marker_iter_start) (&iter), m = iter.marker; | |
7190 | m != NULL; | |
7191 | USTF(marker_iter_next) (&iter), m = iter.marker) | |
7192 | if ((uintptr_t ) m->location == address) | |
7193 | { | |
7194 | int result; | |
7195 | ||
7196 | trace_debug ("found marker for address. " | |
7197 | "ltt_marker_connect (marker = %s/%s)", | |
7198 | m->channel, m->name); | |
7199 | ||
493e2a69 MS |
7200 | result = USTF(ltt_marker_connect) (m->channel, m->name, |
7201 | GDB_PROBE_NAME); | |
0fb4aa4b PA |
7202 | if (result && result != -EEXIST) |
7203 | trace_debug ("ltt_marker_connect (marker = %s/%s, errno = %d)", | |
7204 | m->channel, m->name, -result); | |
7205 | ||
7206 | if (result < 0) | |
7207 | { | |
7208 | sprintf (packet, "E.could not connect marker: channel=%s, name=%s", | |
7209 | m->channel, m->name); | |
7210 | return -1; | |
7211 | } | |
7212 | ||
7213 | strcpy (packet, "OK"); | |
7214 | return 0; | |
7215 | } | |
7216 | ||
7217 | sprintf (packet, "E.no marker found at 0x%s", paddress (address)); | |
7218 | return -1; | |
7219 | } | |
7220 | ||
7221 | static int | |
7222 | cmd_qtstmat (char *packet) | |
7223 | { | |
7224 | char *p = packet; | |
7225 | ULONGEST address; | |
7226 | struct marker_iter iter; | |
7227 | struct marker *m; | |
7228 | ||
7229 | p += sizeof ("qTSTMat:") - 1; | |
7230 | ||
7231 | p = unpack_varlen_hex (p, &address); | |
7232 | ||
7233 | USTF(marker_iter_reset) (&iter); | |
7234 | ||
7235 | for (USTF(marker_iter_start) (&iter), m = iter.marker; | |
7236 | m != NULL; | |
7237 | USTF(marker_iter_next) (&iter), m = iter.marker) | |
7238 | if ((uintptr_t ) m->location == address) | |
7239 | { | |
7240 | response_ust_marker (packet, m); | |
7241 | return 0; | |
7242 | } | |
7243 | ||
7244 | strcpy (packet, "l"); | |
7245 | return -1; | |
7246 | } | |
7247 | ||
7248 | static void * | |
7249 | gdb_ust_thread (void *arg) | |
7250 | { | |
7251 | int listen_fd; | |
7252 | ||
7253 | while (1) | |
7254 | { | |
7255 | listen_fd = gdb_ust_socket_init (); | |
7256 | ||
7257 | #ifdef SYS_gettid | |
7258 | if (helper_thread_id == 0) | |
7259 | helper_thread_id = syscall (SYS_gettid); | |
7260 | #endif | |
7261 | ||
7262 | if (listen_fd == -1) | |
7263 | { | |
7264 | warning ("could not create sync socket\n"); | |
7265 | break; | |
7266 | } | |
7267 | ||
7268 | while (1) | |
7269 | { | |
7270 | socklen_t tmp; | |
7271 | struct sockaddr_un sockaddr; | |
7272 | int fd; | |
7273 | char buf[1]; | |
7274 | int ret; | |
7275 | ||
7276 | tmp = sizeof (sockaddr); | |
7277 | ||
7278 | do | |
7279 | { | |
7280 | fd = accept (listen_fd, &sockaddr, &tmp); | |
7281 | } | |
7282 | /* It seems an ERESTARTSYS can escape out of accept. */ | |
7283 | while (fd == -512 || (fd == -1 && errno == EINTR)); | |
7284 | ||
7285 | if (fd < 0) | |
7286 | { | |
7287 | warning ("Accept returned %d, error: %s\n", | |
7288 | fd, strerror (errno)); | |
7289 | break; | |
7290 | } | |
7291 | ||
7292 | do | |
7293 | { | |
7294 | ret = read (fd, buf, 1); | |
7295 | } while (ret == -1 && errno == EINTR); | |
7296 | ||
7297 | if (ret == -1) | |
7298 | { | |
7299 | warning ("reading socket (fd=%d) failed with %s", | |
7300 | fd, strerror (errno)); | |
7301 | close (fd); | |
7302 | break; | |
7303 | } | |
7304 | ||
7305 | if (cmd_buf[0]) | |
7306 | { | |
7307 | if (strcmp ("qTfSTM", cmd_buf) == 0) | |
7308 | { | |
7309 | cmd_qtfstm (cmd_buf); | |
7310 | } | |
7311 | else if (strcmp ("qTsSTM", cmd_buf) == 0) | |
7312 | { | |
7313 | cmd_qtsstm (cmd_buf); | |
7314 | } | |
7315 | else if (strncmp ("unprobe_marker_at:", | |
7316 | cmd_buf, | |
7317 | sizeof ("unprobe_marker_at:") - 1) == 0) | |
7318 | { | |
7319 | unprobe_marker_at (cmd_buf); | |
7320 | } | |
7321 | else if (strncmp ("probe_marker_at:", | |
7322 | cmd_buf, | |
7323 | sizeof ("probe_marker_at:") - 1) == 0) | |
7324 | { | |
7325 | probe_marker_at (cmd_buf); | |
7326 | } | |
7327 | else if (strncmp ("qTSTMat:", | |
7328 | cmd_buf, | |
7329 | sizeof ("qTSTMat:") - 1) == 0) | |
7330 | { | |
7331 | cmd_qtstmat (cmd_buf); | |
7332 | } | |
7333 | else if (strcmp (cmd_buf, "help") == 0) | |
7334 | { | |
7335 | strcpy (cmd_buf, "for help, press F1\n"); | |
7336 | } | |
7337 | else | |
7338 | strcpy (cmd_buf, ""); | |
7339 | } | |
7340 | ||
7341 | write (fd, buf, 1); | |
7342 | close (fd); | |
7343 | } | |
7344 | } | |
7345 | ||
7346 | return NULL; | |
7347 | } | |
7348 | ||
7349 | #include <signal.h> | |
7350 | ||
7351 | static void | |
7352 | gdb_ust_init (void) | |
7353 | { | |
7354 | int res; | |
7355 | pthread_t thread; | |
7356 | sigset_t new_mask; | |
7357 | sigset_t orig_mask; | |
7358 | ||
7359 | if (!dlsym_ust ()) | |
7360 | return; | |
7361 | ||
7362 | /* We want the helper thread to be as transparent as possible, so | |
7363 | have it inherit an all-signals-blocked mask. */ | |
7364 | ||
7365 | sigfillset (&new_mask); | |
7366 | res = pthread_sigmask (SIG_SETMASK, &new_mask, &orig_mask); | |
7367 | if (res) | |
7368 | fatal ("pthread_sigmask (1) failed: %s", strerror (res)); | |
7369 | ||
7370 | res = pthread_create (&thread, | |
7371 | NULL, | |
7372 | gdb_ust_thread, | |
7373 | NULL); | |
7374 | ||
7375 | res = pthread_sigmask (SIG_SETMASK, &orig_mask, NULL); | |
7376 | if (res) | |
7377 | fatal ("pthread_sigmask (2) failed: %s", strerror (res)); | |
7378 | ||
7379 | while (helper_thread_id == 0) | |
7380 | usleep (1); | |
7381 | ||
7382 | USTF(ltt_probe_register) (&gdb_ust_probe); | |
7383 | } | |
7384 | ||
7385 | #endif /* HAVE_UST */ | |
7386 | ||
7387 | #include <sys/mman.h> | |
7388 | #include <fcntl.h> | |
7389 | ||
7390 | IP_AGENT_EXPORT char *gdb_tp_heap_buffer; | |
7391 | IP_AGENT_EXPORT char *gdb_jump_pad_buffer; | |
7392 | IP_AGENT_EXPORT char *gdb_jump_pad_buffer_end; | |
7393 | ||
7394 | static void __attribute__ ((constructor)) | |
7395 | initialize_tracepoint_ftlib (void) | |
7396 | { | |
7397 | initialize_tracepoint (); | |
7398 | ||
7399 | #ifdef HAVE_UST | |
7400 | gdb_ust_init (); | |
7401 | #endif | |
7402 | } | |
7403 | ||
7404 | #endif /* IN_PROCESS_AGENT */ | |
fa593d66 | 7405 | |
219f2f23 PA |
7406 | static LONGEST |
7407 | tsv_get_timestamp (void) | |
7408 | { | |
7409 | struct timeval tv; | |
7410 | ||
7411 | if (gettimeofday (&tv, 0) != 0) | |
7412 | return -1; | |
7413 | else | |
7414 | return (LONGEST) tv.tv_sec * 1000000 + tv.tv_usec; | |
7415 | } | |
7416 | ||
7417 | void | |
7418 | initialize_tracepoint (void) | |
7419 | { | |
7420 | /* There currently no way to change the buffer size. */ | |
7421 | const int sizeOfBuffer = 5 * 1024 * 1024; | |
7422 | unsigned char *buf = xmalloc (sizeOfBuffer); | |
7423 | init_trace_buffer (buf, sizeOfBuffer); | |
7424 | ||
7425 | /* Wire trace state variable 1 to be the timestamp. This will be | |
7426 | uploaded to GDB upon connection and become one of its trace state | |
7427 | variables. (In case you're wondering, if GDB already has a trace | |
7428 | variable numbered 1, it will be renumbered.) */ | |
fa593d66 | 7429 | create_trace_state_variable (1, 0); |
219f2f23 PA |
7430 | set_trace_state_variable_name (1, "trace_timestamp"); |
7431 | set_trace_state_variable_getter (1, tsv_get_timestamp); | |
fa593d66 PA |
7432 | |
7433 | #ifdef IN_PROCESS_AGENT | |
7434 | { | |
7435 | int pagesize; | |
7436 | pagesize = sysconf (_SC_PAGE_SIZE); | |
7437 | if (pagesize == -1) | |
7438 | fatal ("sysconf"); | |
7439 | ||
7440 | gdb_tp_heap_buffer = xmalloc (5 * 1024 * 1024); | |
7441 | ||
7442 | /* Allocate scratch buffer aligned on a page boundary. */ | |
7443 | gdb_jump_pad_buffer = memalign (pagesize, pagesize * 20); | |
7444 | gdb_jump_pad_buffer_end = gdb_jump_pad_buffer + pagesize * 20; | |
7445 | ||
7446 | /* Make it writable and executable. */ | |
7447 | if (mprotect (gdb_jump_pad_buffer, pagesize * 20, | |
7448 | PROT_READ | PROT_WRITE | PROT_EXEC) != 0) | |
7449 | fatal ("\ | |
7450 | initialize_tracepoint: mprotect(%p, %d, PROT_READ|PROT_EXEC) failed with %s", | |
7451 | gdb_jump_pad_buffer, pagesize * 20, strerror (errno)); | |
7452 | } | |
7453 | ||
7454 | initialize_low_tracepoint (); | |
7455 | #endif | |
219f2f23 | 7456 | } |