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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 | |
61adf464 | 29 | /* This file is built for both GDBserver, and the in-process |
fa593d66 PA |
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 | { | |
fa593d66 PA |
323 | int i; |
324 | ||
325 | if (all_tracepoint_symbols_looked_up) | |
326 | return; | |
327 | ||
fa593d66 PA |
328 | for (i = 0; i < sizeof (symbol_list) / sizeof (symbol_list[0]); i++) |
329 | { | |
330 | CORE_ADDR *addrp = | |
331 | (CORE_ADDR *) ((char *) &ipa_sym_addrs + symbol_list[i].offset); | |
332 | ||
333 | if (look_up_one_symbol (symbol_list[i].name, addrp, 1) == 0) | |
334 | { | |
335 | if (debug_threads) | |
336 | fprintf (stderr, "symbol `%s' not found\n", symbol_list[i].name); | |
2275a1a7 | 337 | return; |
fa593d66 PA |
338 | } |
339 | } | |
340 | ||
2275a1a7 | 341 | all_tracepoint_symbols_looked_up = 1; |
fa593d66 PA |
342 | } |
343 | ||
344 | #endif | |
345 | ||
346 | /* GDBserver places a breakpoint on the IPA's version (which is a nop) | |
347 | of the "stop_tracing" function. When this breakpoint is hit, | |
348 | tracing stopped in the IPA for some reason. E.g., due to | |
349 | tracepoint reaching the pass count, hitting conditional expression | |
350 | evaluation error, etc. | |
351 | ||
352 | The IPA's trace buffer is never in circular tracing mode: instead, | |
353 | GDBserver's is, and whenever the in-process buffer fills, it calls | |
354 | "flush_trace_buffer", which triggers an internal breakpoint. | |
355 | GDBserver reacts to this breakpoint by pulling the meanwhile | |
356 | collected data. Old frames discarding is always handled on the | |
357 | GDBserver side. */ | |
358 | ||
359 | #ifdef IN_PROCESS_AGENT | |
360 | int debug_threads = 0; | |
361 | ||
362 | int | |
363 | read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) | |
364 | { | |
365 | memcpy (myaddr, (void *) (uintptr_t) memaddr, len); | |
366 | return 0; | |
367 | } | |
368 | ||
369 | /* Call this in the functions where GDBserver places a breakpoint, so | |
370 | that the compiler doesn't try to be clever and skip calling the | |
371 | function at all. This is necessary, even if we tell the compiler | |
372 | to not inline said functions. */ | |
373 | ||
374 | #if defined(__GNUC__) | |
375 | # define UNKNOWN_SIDE_EFFECTS() asm ("") | |
376 | #else | |
377 | # define UNKNOWN_SIDE_EFFECTS() do {} while (0) | |
378 | #endif | |
379 | ||
380 | IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE | |
381 | stop_tracing (void) | |
382 | { | |
383 | /* GDBserver places breakpoint here. */ | |
384 | UNKNOWN_SIDE_EFFECTS(); | |
385 | } | |
386 | ||
387 | IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE | |
388 | flush_trace_buffer (void) | |
389 | { | |
390 | /* GDBserver places breakpoint here. */ | |
391 | UNKNOWN_SIDE_EFFECTS(); | |
392 | } | |
393 | ||
394 | #endif | |
395 | ||
396 | #ifndef IN_PROCESS_AGENT | |
219f2f23 PA |
397 | static int |
398 | tracepoint_handler (CORE_ADDR address) | |
399 | { | |
400 | trace_debug ("tracepoint_handler: tracepoint at 0x%s hit", | |
401 | paddress (address)); | |
402 | return 0; | |
403 | } | |
404 | ||
fa593d66 PA |
405 | /* Breakpoint at "stop_tracing" in the inferior lib. */ |
406 | struct breakpoint *stop_tracing_bkpt; | |
407 | static int stop_tracing_handler (CORE_ADDR); | |
408 | ||
409 | /* Breakpoint at "flush_trace_buffer" in the inferior lib. */ | |
410 | struct breakpoint *flush_trace_buffer_bkpt; | |
411 | static int flush_trace_buffer_handler (CORE_ADDR); | |
412 | ||
413 | static void download_tracepoints (void); | |
414 | static void download_trace_state_variables (void); | |
415 | static void upload_fast_traceframes (void); | |
416 | ||
0fb4aa4b PA |
417 | static int run_inferior_command (char *cmd); |
418 | ||
fa593d66 PA |
419 | static int |
420 | read_inferior_integer (CORE_ADDR symaddr, int *val) | |
421 | { | |
422 | return read_inferior_memory (symaddr, (unsigned char *) val, | |
423 | sizeof (*val)); | |
424 | } | |
425 | ||
426 | static int | |
427 | read_inferior_uinteger (CORE_ADDR symaddr, unsigned int *val) | |
428 | { | |
429 | return read_inferior_memory (symaddr, (unsigned char *) val, | |
430 | sizeof (*val)); | |
431 | } | |
432 | ||
433 | static int | |
434 | read_inferior_data_pointer (CORE_ADDR symaddr, CORE_ADDR *val) | |
435 | { | |
436 | void *pval = (void *) (uintptr_t) val; | |
437 | int ret; | |
438 | ||
439 | ret = read_inferior_memory (symaddr, (unsigned char *) &pval, sizeof (pval)); | |
440 | *val = (uintptr_t) pval; | |
441 | return ret; | |
442 | } | |
443 | ||
444 | static int | |
445 | write_inferior_data_pointer (CORE_ADDR symaddr, CORE_ADDR val) | |
446 | { | |
447 | void *pval = (void *) (uintptr_t) val; | |
448 | return write_inferior_memory (symaddr, | |
449 | (unsigned char *) &pval, sizeof (pval)); | |
450 | } | |
451 | ||
452 | static int | |
453 | write_inferior_integer (CORE_ADDR symaddr, int val) | |
454 | { | |
455 | return write_inferior_memory (symaddr, (unsigned char *) &val, sizeof (val)); | |
456 | } | |
457 | ||
458 | static int | |
459 | write_inferior_uinteger (CORE_ADDR symaddr, unsigned int val) | |
460 | { | |
461 | return write_inferior_memory (symaddr, (unsigned char *) &val, sizeof (val)); | |
462 | } | |
463 | ||
464 | #endif | |
465 | ||
219f2f23 PA |
466 | /* This enum must exactly match what is documented in |
467 | gdb/doc/agentexpr.texi, including all the numerical values. */ | |
468 | ||
469 | enum gdb_agent_op | |
470 | { | |
94d5e490 TT |
471 | #define DEFOP(NAME, SIZE, DATA_SIZE, CONSUMED, PRODUCED, VALUE) \ |
472 | gdb_agent_op_ ## NAME = VALUE, | |
473 | #include "ax.def" | |
474 | #undef DEFOP | |
219f2f23 PA |
475 | gdb_agent_op_last |
476 | }; | |
477 | ||
478 | static const char *gdb_agent_op_names [gdb_agent_op_last] = | |
479 | { | |
94d5e490 TT |
480 | "?undef?" |
481 | #define DEFOP(NAME, SIZE, DATA_SIZE, CONSUMED, PRODUCED, VALUE) , # NAME | |
482 | #include "ax.def" | |
483 | #undef DEFOP | |
219f2f23 PA |
484 | }; |
485 | ||
486 | struct agent_expr | |
487 | { | |
488 | int length; | |
489 | ||
490 | unsigned char *bytes; | |
491 | }; | |
492 | ||
493 | /* Base action. Concrete actions inherit this. */ | |
494 | ||
495 | struct tracepoint_action | |
496 | { | |
497 | char type; | |
498 | }; | |
499 | ||
500 | /* An 'M' (collect memory) action. */ | |
501 | struct collect_memory_action | |
502 | { | |
503 | struct tracepoint_action base; | |
504 | ||
505 | ULONGEST addr; | |
506 | ULONGEST len; | |
507 | int basereg; | |
508 | }; | |
509 | ||
510 | /* An 'R' (collect registers) action. */ | |
511 | ||
512 | struct collect_registers_action | |
513 | { | |
514 | struct tracepoint_action base; | |
515 | }; | |
516 | ||
517 | /* An 'X' (evaluate expression) action. */ | |
518 | ||
519 | struct eval_expr_action | |
520 | { | |
521 | struct tracepoint_action base; | |
522 | ||
523 | struct agent_expr *expr; | |
524 | }; | |
525 | ||
0fb4aa4b PA |
526 | /* An 'L' (collect static trace data) action. */ |
527 | struct collect_static_trace_data_action | |
528 | { | |
529 | struct tracepoint_action base; | |
530 | }; | |
531 | ||
219f2f23 PA |
532 | /* This structure describes a piece of the source-level definition of |
533 | the tracepoint. The contents are not interpreted by the target, | |
534 | but preserved verbatim for uploading upon reconnection. */ | |
535 | ||
536 | struct source_string | |
537 | { | |
538 | /* The type of string, such as "cond" for a conditional. */ | |
539 | char *type; | |
540 | ||
541 | /* The source-level string itself. For the sake of target | |
542 | debugging, we store it in plaintext, even though it is always | |
543 | transmitted in hex. */ | |
544 | char *str; | |
545 | ||
546 | /* Link to the next one in the list. We link them in the order | |
547 | received, in case some make up an ordered list of commands or | |
548 | some such. */ | |
549 | struct source_string *next; | |
550 | }; | |
551 | ||
fa593d66 PA |
552 | enum tracepoint_type |
553 | { | |
554 | /* Trap based tracepoint. */ | |
555 | trap_tracepoint, | |
556 | ||
557 | /* A fast tracepoint implemented with a jump instead of a trap. */ | |
558 | fast_tracepoint, | |
0fb4aa4b PA |
559 | |
560 | /* A static tracepoint, implemented by a program call into a tracing | |
561 | library. */ | |
562 | static_tracepoint | |
fa593d66 PA |
563 | }; |
564 | ||
219f2f23 PA |
565 | struct tracepoint_hit_ctx; |
566 | ||
6a271cae PA |
567 | typedef enum eval_result_type (*condfn) (struct tracepoint_hit_ctx *, |
568 | ULONGEST *); | |
569 | ||
219f2f23 PA |
570 | /* The definition of a tracepoint. */ |
571 | ||
572 | /* Tracepoints may have multiple locations, each at a different | |
573 | address. This can occur with optimizations, template | |
574 | instantiation, etc. Since the locations may be in different | |
575 | scopes, the conditions and actions may be different for each | |
576 | location. Our target version of tracepoints is more like GDB's | |
577 | notion of "breakpoint locations", but we have almost nothing that | |
578 | is not per-location, so we bother having two kinds of objects. The | |
579 | key consequence is that numbers are not unique, and that it takes | |
580 | both number and address to identify a tracepoint uniquely. */ | |
581 | ||
582 | struct tracepoint | |
583 | { | |
584 | /* The number of the tracepoint, as specified by GDB. Several | |
585 | tracepoint objects here may share a number. */ | |
586 | int number; | |
587 | ||
588 | /* Address at which the tracepoint is supposed to trigger. Several | |
589 | tracepoints may share an address. */ | |
590 | CORE_ADDR address; | |
591 | ||
fa593d66 PA |
592 | /* Tracepoint type. */ |
593 | enum tracepoint_type type; | |
594 | ||
219f2f23 PA |
595 | /* True if the tracepoint is currently enabled. */ |
596 | int enabled; | |
597 | ||
598 | /* The number of single steps that will be performed after each | |
599 | tracepoint hit. */ | |
600 | long step_count; | |
601 | ||
602 | /* The number of times the tracepoint may be hit before it will | |
603 | terminate the entire tracing run. */ | |
604 | long pass_count; | |
605 | ||
606 | /* Pointer to the agent expression that is the tracepoint's | |
607 | conditional, or NULL if the tracepoint is unconditional. */ | |
608 | struct agent_expr *cond; | |
609 | ||
610 | /* The list of actions to take when the tracepoint triggers. */ | |
611 | int numactions; | |
612 | struct tracepoint_action **actions; | |
219f2f23 PA |
613 | |
614 | /* Count of the times we've hit this tracepoint during the run. | |
615 | Note that while-stepping steps are not counted as "hits". */ | |
616 | long hit_count; | |
617 | ||
6a271cae PA |
618 | CORE_ADDR compiled_cond; |
619 | ||
fa593d66 PA |
620 | /* Link to the next tracepoint in the list. */ |
621 | struct tracepoint *next; | |
622 | ||
623 | #ifndef IN_PROCESS_AGENT | |
624 | /* The list of actions to take when the tracepoint triggers, in | |
625 | string/packet form. */ | |
626 | char **actions_str; | |
627 | ||
219f2f23 PA |
628 | /* The collection of strings that describe the tracepoint as it was |
629 | entered into GDB. These are not used by the target, but are | |
630 | reported back to GDB upon reconnection. */ | |
631 | struct source_string *source_strings; | |
632 | ||
fa593d66 PA |
633 | /* The number of bytes displaced by fast tracepoints. It may subsume |
634 | multiple instructions, for multi-byte fast tracepoints. This | |
635 | field is only valid for fast tracepoints. */ | |
636 | int orig_size; | |
637 | ||
638 | /* Only for fast tracepoints. */ | |
639 | CORE_ADDR obj_addr_on_target; | |
640 | ||
641 | /* Address range where the original instruction under a fast | |
642 | tracepoint was relocated to. (_end is actually one byte past | |
643 | the end). */ | |
644 | CORE_ADDR adjusted_insn_addr; | |
645 | CORE_ADDR adjusted_insn_addr_end; | |
646 | ||
647 | /* The address range of the piece of the jump pad buffer that was | |
648 | assigned to this fast tracepoint. (_end is actually one byte | |
649 | past the end).*/ | |
650 | CORE_ADDR jump_pad; | |
651 | CORE_ADDR jump_pad_end; | |
652 | ||
653 | /* The list of actions to take while in a stepping loop. These | |
654 | fields are only valid for patch-based tracepoints. */ | |
655 | int num_step_actions; | |
656 | struct tracepoint_action **step_actions; | |
657 | /* Same, but in string/packet form. */ | |
658 | char **step_actions_str; | |
659 | ||
660 | /* Handle returned by the breakpoint or tracepoint module when we | |
0fb4aa4b PA |
661 | inserted the trap or jump, or hooked into a static tracepoint. |
662 | NULL if we haven't inserted it yet. */ | |
219f2f23 | 663 | void *handle; |
fa593d66 | 664 | #endif |
219f2f23 | 665 | |
219f2f23 PA |
666 | }; |
667 | ||
fa593d66 PA |
668 | #ifndef IN_PROCESS_AGENT |
669 | ||
219f2f23 PA |
670 | /* Given `while-stepping', a thread may be collecting data for more |
671 | than one tracepoint simultaneously. On the other hand, the same | |
672 | tracepoint with a while-stepping action may be hit by more than one | |
673 | thread simultaneously (but not quite, each thread could be handling | |
674 | a different step). Each thread holds a list of these objects, | |
675 | representing the current step of each while-stepping action being | |
676 | collected. */ | |
677 | ||
678 | struct wstep_state | |
679 | { | |
680 | struct wstep_state *next; | |
681 | ||
682 | /* The tracepoint number. */ | |
683 | int tp_number; | |
684 | /* The tracepoint's address. */ | |
685 | CORE_ADDR tp_address; | |
686 | ||
687 | /* The number of the current step in this 'while-stepping' | |
688 | action. */ | |
689 | long current_step; | |
690 | }; | |
691 | ||
fa593d66 PA |
692 | #endif |
693 | ||
694 | /* The linked list of all tracepoints. Marked explicitly as used as | |
695 | the in-process library doesn't use it for the fast tracepoints | |
696 | support. */ | |
697 | IP_AGENT_EXPORT struct tracepoint *tracepoints ATTR_USED; | |
219f2f23 | 698 | |
fa593d66 | 699 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
700 | |
701 | /* Pointer to the last tracepoint in the list, new tracepoints are | |
702 | linked in at the end. */ | |
703 | ||
704 | static struct tracepoint *last_tracepoint; | |
fa593d66 | 705 | #endif |
219f2f23 PA |
706 | |
707 | /* The first tracepoint to exceed its pass count. */ | |
708 | ||
fa593d66 | 709 | IP_AGENT_EXPORT struct tracepoint *stopping_tracepoint; |
219f2f23 PA |
710 | |
711 | /* True if the trace buffer is full or otherwise no longer usable. */ | |
712 | ||
fa593d66 | 713 | IP_AGENT_EXPORT int trace_buffer_is_full; |
219f2f23 PA |
714 | |
715 | /* Enumeration of the different kinds of things that can happen during | |
716 | agent expression evaluation. */ | |
717 | ||
718 | enum eval_result_type | |
719 | { | |
720 | expr_eval_no_error, | |
721 | expr_eval_empty_expression, | |
722 | expr_eval_empty_stack, | |
723 | expr_eval_stack_overflow, | |
724 | expr_eval_stack_underflow, | |
725 | expr_eval_unhandled_opcode, | |
726 | expr_eval_unrecognized_opcode, | |
727 | expr_eval_divide_by_zero, | |
728 | expr_eval_invalid_goto | |
729 | }; | |
730 | ||
731 | static enum eval_result_type expr_eval_result = expr_eval_no_error; | |
732 | ||
fa593d66 PA |
733 | #ifndef IN_PROCESS_AGENT |
734 | ||
219f2f23 PA |
735 | static const char *eval_result_names[] = |
736 | { | |
737 | "terror:in the attic", /* this should never be reported */ | |
738 | "terror:empty expression", | |
739 | "terror:empty stack", | |
740 | "terror:stack overflow", | |
741 | "terror:stack underflow", | |
742 | "terror:unhandled opcode", | |
743 | "terror:unrecognized opcode", | |
744 | "terror:divide by zero" | |
745 | }; | |
746 | ||
fa593d66 PA |
747 | #endif |
748 | ||
219f2f23 PA |
749 | /* The tracepoint in which the error occurred. */ |
750 | ||
751 | static struct tracepoint *error_tracepoint; | |
752 | ||
753 | struct trace_state_variable | |
754 | { | |
755 | /* This is the name of the variable as used in GDB. The target | |
756 | doesn't use the name, but needs to have it for saving and | |
757 | reconnection purposes. */ | |
758 | char *name; | |
759 | ||
760 | /* This number identifies the variable uniquely. Numbers may be | |
761 | assigned either by the target (in the case of builtin variables), | |
762 | or by GDB, and are presumed unique during the course of a trace | |
763 | experiment. */ | |
764 | int number; | |
765 | ||
766 | /* The variable's initial value, a 64-bit signed integer always. */ | |
767 | LONGEST initial_value; | |
768 | ||
769 | /* The variable's value, a 64-bit signed integer always. */ | |
770 | LONGEST value; | |
771 | ||
772 | /* Pointer to a getter function, used to supply computed values. */ | |
773 | LONGEST (*getter) (void); | |
774 | ||
775 | /* Link to the next variable. */ | |
776 | struct trace_state_variable *next; | |
777 | }; | |
778 | ||
779 | /* Linked list of all trace state variables. */ | |
780 | ||
fa593d66 PA |
781 | #ifdef IN_PROCESS_AGENT |
782 | struct trace_state_variable *alloced_trace_state_variables; | |
783 | #endif | |
784 | ||
785 | IP_AGENT_EXPORT struct trace_state_variable *trace_state_variables; | |
219f2f23 PA |
786 | |
787 | /* The results of tracing go into a fixed-size space known as the | |
788 | "trace buffer". Because usage follows a limited number of | |
789 | patterns, we manage it ourselves rather than with malloc. Basic | |
790 | rules are that we create only one trace frame at a time, each is | |
791 | variable in size, they are never moved once created, and we only | |
792 | discard if we are doing a circular buffer, and then only the oldest | |
793 | ones. Each trace frame includes its own size, so we don't need to | |
794 | link them together, and the trace frame number is relative to the | |
795 | first one, so we don't need to record numbers. A trace frame also | |
796 | records the number of the tracepoint that created it. The data | |
797 | itself is a series of blocks, each introduced by a single character | |
798 | and with a defined format. Each type of block has enough | |
799 | type/length info to allow scanners to jump quickly from one block | |
800 | to the next without reading each byte in the block. */ | |
801 | ||
802 | /* Trace buffer management would be simple - advance a free pointer | |
803 | from beginning to end, then stop - were it not for the circular | |
804 | buffer option, which is a useful way to prevent a trace run from | |
805 | stopping prematurely because the buffer filled up. In the circular | |
806 | case, the location of the first trace frame (trace_buffer_start) | |
807 | moves as old trace frames are discarded. Also, since we grow trace | |
808 | frames incrementally as actions are performed, we wrap around to | |
809 | the beginning of the trace buffer. This is per-block, so each | |
810 | block within a trace frame remains contiguous. Things get messy | |
811 | when the wrapped-around trace frame is the one being discarded; the | |
812 | free space ends up in two parts at opposite ends of the buffer. */ | |
813 | ||
814 | #ifndef ATTR_PACKED | |
815 | # if defined(__GNUC__) | |
816 | # define ATTR_PACKED __attribute__ ((packed)) | |
817 | # else | |
818 | # define ATTR_PACKED /* nothing */ | |
819 | # endif | |
820 | #endif | |
821 | ||
822 | /* The data collected at a tracepoint hit. This object should be as | |
823 | small as possible, since there may be a great many of them. We do | |
824 | not need to keep a frame number, because they are all sequential | |
825 | and there are no deletions; so the Nth frame in the buffer is | |
826 | always frame number N. */ | |
827 | ||
828 | struct traceframe | |
829 | { | |
830 | /* Number of the tracepoint that collected this traceframe. A value | |
831 | of 0 indicates the current end of the trace buffer. We make this | |
832 | a 16-bit field because it's never going to happen that GDB's | |
833 | numbering of tracepoints reaches 32,000. */ | |
834 | int tpnum : 16; | |
835 | ||
836 | /* The size of the data in this trace frame. We limit this to 32 | |
837 | bits, even on a 64-bit target, because it's just implausible that | |
838 | one is validly going to collect 4 gigabytes of data at a single | |
839 | tracepoint hit. */ | |
840 | unsigned int data_size : 32; | |
841 | ||
842 | /* The base of the trace data, which is contiguous from this point. */ | |
843 | unsigned char data[0]; | |
844 | ||
fa593d66 | 845 | } ATTR_PACKED; |
219f2f23 PA |
846 | |
847 | /* The traceframe to be used as the source of data to send back to | |
848 | GDB. A value of -1 means to get data from the live program. */ | |
849 | ||
850 | int current_traceframe = -1; | |
851 | ||
852 | /* This flag is true if the trace buffer is circular, meaning that | |
853 | when it fills, the oldest trace frames are discarded in order to | |
854 | make room. */ | |
855 | ||
fa593d66 | 856 | #ifndef IN_PROCESS_AGENT |
219f2f23 | 857 | static int circular_trace_buffer; |
fa593d66 | 858 | #endif |
219f2f23 PA |
859 | |
860 | /* Pointer to the block of memory that traceframes all go into. */ | |
861 | ||
862 | static unsigned char *trace_buffer_lo; | |
863 | ||
864 | /* Pointer to the end of the trace buffer, more precisely to the byte | |
865 | after the end of the buffer. */ | |
866 | ||
867 | static unsigned char *trace_buffer_hi; | |
868 | ||
fa593d66 PA |
869 | /* Control structure holding the read/write/etc. pointers into the |
870 | trace buffer. We need more than one of these to implement a | |
871 | transaction-like mechanism to garantees that both GDBserver and the | |
872 | in-process agent can try to change the trace buffer | |
873 | simultaneously. */ | |
874 | ||
875 | struct trace_buffer_control | |
876 | { | |
877 | /* Pointer to the first trace frame in the buffer. In the | |
878 | non-circular case, this is equal to trace_buffer_lo, otherwise it | |
879 | moves around in the buffer. */ | |
880 | unsigned char *start; | |
881 | ||
882 | /* Pointer to the free part of the trace buffer. Note that we clear | |
883 | several bytes at and after this pointer, so that traceframe | |
884 | scans/searches terminate properly. */ | |
885 | unsigned char *free; | |
886 | ||
887 | /* Pointer to the byte after the end of the free part. Note that | |
888 | this may be smaller than trace_buffer_free in the circular case, | |
889 | and means that the free part is in two pieces. Initially it is | |
890 | equal to trace_buffer_hi, then is generally equivalent to | |
891 | trace_buffer_start. */ | |
892 | unsigned char *end_free; | |
893 | ||
894 | /* Pointer to the wraparound. If not equal to trace_buffer_hi, then | |
895 | this is the point at which the trace data breaks, and resumes at | |
896 | trace_buffer_lo. */ | |
897 | unsigned char *wrap; | |
898 | }; | |
899 | ||
900 | /* Same as above, to be used by GDBserver when updating the in-process | |
901 | agent. */ | |
902 | struct ipa_trace_buffer_control | |
903 | { | |
904 | uintptr_t start; | |
905 | uintptr_t free; | |
906 | uintptr_t end_free; | |
907 | uintptr_t wrap; | |
908 | }; | |
909 | ||
910 | ||
911 | /* We have possibly both GDBserver and an inferior thread accessing | |
912 | the same IPA trace buffer memory. The IPA is the producer (tries | |
913 | to put new frames in the buffer), while GDBserver occasionally | |
914 | consumes them, that is, flushes the IPA's buffer into its own | |
915 | buffer. Both sides need to update the trace buffer control | |
916 | pointers (current head, tail, etc.). We can't use a global lock to | |
917 | synchronize the accesses, as otherwise we could deadlock GDBserver | |
918 | (if the thread holding the lock stops for a signal, say). So | |
919 | instead of that, we use a transaction scheme where GDBserver writes | |
920 | always prevail over the IPAs writes, and, we have the IPA detect | |
921 | the commit failure/overwrite, and retry the whole attempt. This is | |
922 | mainly implemented by having a global token object that represents | |
923 | who wrote last to the buffer control structure. We need to freeze | |
924 | any inferior writing to the buffer while GDBserver touches memory, | |
925 | so that the inferior can correctly detect that GDBserver had been | |
926 | there, otherwise, it could mistakingly think its commit was | |
927 | successful; that's implemented by simply having GDBserver set a | |
928 | breakpoint the inferior hits if it is the critical region. | |
929 | ||
930 | There are three cycling trace buffer control structure copies | |
931 | (buffer head, tail, etc.), with the token object including an index | |
932 | indicating which is current live copy. The IPA tentatively builds | |
933 | an updated copy in a non-current control structure, while GDBserver | |
934 | always clobbers the current version directly. The IPA then tries | |
935 | to atomically "commit" its version; if GDBserver clobbered the | |
936 | structure meanwhile, that will fail, and the IPA restarts the | |
937 | allocation process. | |
938 | ||
939 | Listing the step in further detail, we have: | |
940 | ||
941 | In-process agent (producer): | |
942 | ||
943 | - passes by `about_to_request_buffer_space' breakpoint/lock | |
944 | ||
945 | - reads current token, extracts current trace buffer control index, | |
946 | and starts tentatively updating the rightmost one (0->1, 1->2, | |
947 | 2->0). Note that only one inferior thread is executing this code | |
948 | at any given time, due to an outer lock in the jump pads. | |
219f2f23 | 949 | |
fa593d66 | 950 | - updates counters, and tries to commit the token. |
219f2f23 | 951 | |
fa593d66 PA |
952 | - passes by second `about_to_request_buffer_space' breakpoint/lock, |
953 | leaving the sync region. | |
219f2f23 | 954 | |
fa593d66 | 955 | - checks if the update was effective. |
219f2f23 | 956 | |
fa593d66 PA |
957 | - if trace buffer was found full, hits flush_trace_buffer |
958 | breakpoint, and restarts later afterwards. | |
219f2f23 | 959 | |
fa593d66 | 960 | GDBserver (consumer): |
219f2f23 | 961 | |
fa593d66 PA |
962 | - sets `about_to_request_buffer_space' breakpoint/lock. |
963 | ||
964 | - updates the token unconditionally, using the current buffer | |
965 | control index, since it knows that the IP agent always writes to | |
966 | the rightmost, and due to the breakpoint, at most one IP thread | |
967 | can try to update the trace buffer concurrently to GDBserver, so | |
968 | there will be no danger of trace buffer control index wrap making | |
969 | the IPA write to the same index as GDBserver. | |
970 | ||
971 | - flushes the IP agent's trace buffer completely, and updates the | |
972 | current trace buffer control structure. GDBserver *always* wins. | |
973 | ||
974 | - removes the `about_to_request_buffer_space' breakpoint. | |
975 | ||
976 | The token is stored in the `trace_buffer_ctrl_curr' variable. | |
977 | Internally, it's bits are defined as: | |
978 | ||
979 | |-------------+-----+-------------+--------+-------------+--------------| | |
980 | | Bit offsets | 31 | 30 - 20 | 19 | 18-8 | 7-0 | | |
981 | |-------------+-----+-------------+--------+-------------+--------------| | |
982 | | What | GSB | PC (11-bit) | unused | CC (11-bit) | TBCI (8-bit) | | |
983 | |-------------+-----+-------------+--------+-------------+--------------| | |
984 | ||
985 | GSB - GDBserver Stamp Bit | |
986 | PC - Previous Counter | |
987 | CC - Current Counter | |
988 | TBCI - Trace Buffer Control Index | |
989 | ||
990 | ||
991 | An IPA update of `trace_buffer_ctrl_curr' does: | |
992 | ||
993 | - read CC from the current token, save as PC. | |
994 | - updates pointers | |
995 | - atomically tries to write PC+1,CC | |
996 | ||
997 | A GDBserver update of `trace_buffer_ctrl_curr' does: | |
998 | ||
999 | - reads PC and CC from the current token. | |
1000 | - updates pointers | |
1001 | - writes GSB,PC,CC | |
1002 | */ | |
1003 | ||
1004 | /* These are the bits of `trace_buffer_ctrl_curr' that are reserved | |
1005 | for the counters described below. The cleared bits are used to | |
1006 | hold the index of the items of the `trace_buffer_ctrl' array that | |
1007 | is "current". */ | |
1008 | #define GDBSERVER_FLUSH_COUNT_MASK 0xfffffff0 | |
1009 | ||
1010 | /* `trace_buffer_ctrl_curr' contains two counters. The `previous' | |
1011 | counter, and the `current' counter. */ | |
1012 | ||
1013 | #define GDBSERVER_FLUSH_COUNT_MASK_PREV 0x7ff00000 | |
1014 | #define GDBSERVER_FLUSH_COUNT_MASK_CURR 0x0007ff00 | |
1015 | ||
1016 | /* When GDBserver update the IP agent's `trace_buffer_ctrl_curr', it | |
1017 | always stamps this bit as set. */ | |
1018 | #define GDBSERVER_UPDATED_FLUSH_COUNT_BIT 0x80000000 | |
1019 | ||
1020 | #ifdef IN_PROCESS_AGENT | |
1021 | IP_AGENT_EXPORT struct trace_buffer_control trace_buffer_ctrl[3]; | |
1022 | IP_AGENT_EXPORT unsigned int trace_buffer_ctrl_curr; | |
1023 | ||
1024 | # define TRACE_BUFFER_CTRL_CURR \ | |
1025 | (trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK) | |
1026 | ||
1027 | #else | |
1028 | ||
1029 | /* The GDBserver side agent only needs one instance of this object, as | |
1030 | it doesn't need to sync with itself. Define it as array anyway so | |
1031 | that the rest of the code base doesn't need to care for the | |
1032 | difference. */ | |
1033 | struct trace_buffer_control trace_buffer_ctrl[1]; | |
1034 | # define TRACE_BUFFER_CTRL_CURR 0 | |
1035 | #endif | |
1036 | ||
1037 | /* These are convenience macros used to access the current trace | |
1038 | buffer control in effect. */ | |
1039 | #define trace_buffer_start (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].start) | |
1040 | #define trace_buffer_free (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].free) | |
1041 | #define trace_buffer_end_free \ | |
1042 | (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].end_free) | |
1043 | #define trace_buffer_wrap (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].wrap) | |
219f2f23 | 1044 | |
219f2f23 PA |
1045 | |
1046 | /* Macro that returns a pointer to the first traceframe in the buffer. */ | |
1047 | ||
1048 | #define FIRST_TRACEFRAME() ((struct traceframe *) trace_buffer_start) | |
1049 | ||
1050 | /* Macro that returns a pointer to the next traceframe in the buffer. | |
1051 | If the computed location is beyond the wraparound point, subtract | |
1052 | the offset of the wraparound. */ | |
1053 | ||
1054 | #define NEXT_TRACEFRAME_1(TF) \ | |
1055 | (((unsigned char *) (TF)) + sizeof (struct traceframe) + (TF)->data_size) | |
1056 | ||
1057 | #define NEXT_TRACEFRAME(TF) \ | |
1058 | ((struct traceframe *) (NEXT_TRACEFRAME_1 (TF) \ | |
1059 | - ((NEXT_TRACEFRAME_1 (TF) >= trace_buffer_wrap) \ | |
1060 | ? (trace_buffer_wrap - trace_buffer_lo) \ | |
1061 | : 0))) | |
1062 | ||
1063 | /* The difference between these counters represents the total number | |
fa593d66 PA |
1064 | of complete traceframes present in the trace buffer. The IP agent |
1065 | writes to the write count, GDBserver writes to read count. */ | |
219f2f23 | 1066 | |
fa593d66 PA |
1067 | IP_AGENT_EXPORT unsigned int traceframe_write_count; |
1068 | IP_AGENT_EXPORT unsigned int traceframe_read_count; | |
219f2f23 PA |
1069 | |
1070 | /* Convenience macro. */ | |
1071 | ||
1072 | #define traceframe_count \ | |
1073 | ((unsigned int) (traceframe_write_count - traceframe_read_count)) | |
1074 | ||
1075 | /* The count of all traceframes created in the current run, including | |
1076 | ones that were discarded to make room. */ | |
1077 | ||
fa593d66 PA |
1078 | IP_AGENT_EXPORT int traceframes_created; |
1079 | ||
1080 | #ifndef IN_PROCESS_AGENT | |
219f2f23 PA |
1081 | |
1082 | /* Read-only regions are address ranges whose contents don't change, | |
1083 | and so can be read from target memory even while looking at a trace | |
1084 | frame. Without these, disassembly for instance will likely fail, | |
1085 | because the program code is not usually collected into a trace | |
1086 | frame. This data structure does not need to be very complicated or | |
1087 | particularly efficient, it's only going to be used occasionally, | |
1088 | and only by some commands. */ | |
1089 | ||
1090 | struct readonly_region | |
1091 | { | |
1092 | /* The bounds of the region. */ | |
1093 | CORE_ADDR start, end; | |
1094 | ||
1095 | /* Link to the next one. */ | |
1096 | struct readonly_region *next; | |
1097 | }; | |
1098 | ||
1099 | /* Linked list of readonly regions. This list stays in effect from | |
1100 | one tstart to the next. */ | |
1101 | ||
1102 | static struct readonly_region *readonly_regions; | |
1103 | ||
fa593d66 PA |
1104 | #endif |
1105 | ||
219f2f23 PA |
1106 | /* The global that controls tracing overall. */ |
1107 | ||
fa593d66 PA |
1108 | IP_AGENT_EXPORT int tracing; |
1109 | ||
1110 | #ifndef IN_PROCESS_AGENT | |
8336d594 PA |
1111 | |
1112 | /* Controls whether tracing should continue after GDB disconnects. */ | |
1113 | ||
1114 | int disconnected_tracing; | |
219f2f23 PA |
1115 | |
1116 | /* The reason for the last tracing run to have stopped. We initialize | |
1117 | to a distinct string so that GDB can distinguish between "stopped | |
1118 | after running" and "stopped because never run" cases. */ | |
1119 | ||
1120 | static const char *tracing_stop_reason = "tnotrun"; | |
1121 | ||
1122 | static int tracing_stop_tpnum; | |
1123 | ||
fa593d66 PA |
1124 | #endif |
1125 | ||
219f2f23 PA |
1126 | /* Functions local to this file. */ |
1127 | ||
1128 | /* Base "class" for tracepoint type specific data to be passed down to | |
fa593d66 | 1129 | collect_data_at_tracepoint. */ |
219f2f23 PA |
1130 | struct tracepoint_hit_ctx |
1131 | { | |
fa593d66 | 1132 | enum tracepoint_type type; |
219f2f23 PA |
1133 | }; |
1134 | ||
fa593d66 PA |
1135 | #ifdef IN_PROCESS_AGENT |
1136 | ||
1137 | /* Fast/jump tracepoint specific data to be passed down to | |
219f2f23 | 1138 | collect_data_at_tracepoint. */ |
fa593d66 PA |
1139 | struct fast_tracepoint_ctx |
1140 | { | |
1141 | struct tracepoint_hit_ctx base; | |
1142 | ||
1143 | struct regcache regcache; | |
1144 | int regcache_initted; | |
1145 | unsigned char *regspace; | |
1146 | ||
1147 | unsigned char *regs; | |
1148 | struct tracepoint *tpoint; | |
1149 | }; | |
219f2f23 | 1150 | |
0fb4aa4b PA |
1151 | /* Static tracepoint specific data to be passed down to |
1152 | collect_data_at_tracepoint. */ | |
1153 | struct static_tracepoint_ctx | |
1154 | { | |
1155 | struct tracepoint_hit_ctx base; | |
1156 | ||
1157 | /* The regcache corresponding to the registers state at the time of | |
1158 | the tracepoint hit. Initialized lazily, from REGS. */ | |
1159 | struct regcache regcache; | |
1160 | int regcache_initted; | |
1161 | ||
1162 | /* The buffer space REGCACHE above uses. We use a separate buffer | |
1163 | instead of letting the regcache malloc for both signal safety and | |
1164 | performance reasons; this is allocated on the stack instead. */ | |
1165 | unsigned char *regspace; | |
1166 | ||
1167 | /* The register buffer as passed on by lttng/ust. */ | |
1168 | struct registers *regs; | |
1169 | ||
1170 | /* The "printf" formatter and the args the user passed to the marker | |
1171 | call. We use this to be able to collect "static trace data" | |
1172 | ($_sdata). */ | |
1173 | const char *fmt; | |
1174 | va_list *args; | |
1175 | ||
1176 | /* The GDB tracepoint matching the probed marker that was "hit". */ | |
1177 | struct tracepoint *tpoint; | |
1178 | }; | |
1179 | ||
fa593d66 PA |
1180 | #else |
1181 | ||
1182 | /* Static tracepoint specific data to be passed down to | |
1183 | collect_data_at_tracepoint. */ | |
219f2f23 PA |
1184 | struct trap_tracepoint_ctx |
1185 | { | |
1186 | struct tracepoint_hit_ctx base; | |
1187 | ||
1188 | struct regcache *regcache; | |
1189 | }; | |
1190 | ||
fa593d66 PA |
1191 | #endif |
1192 | ||
1193 | #ifndef IN_PROCESS_AGENT | |
219f2f23 PA |
1194 | static struct agent_expr *parse_agent_expr (char **actparm); |
1195 | static char *unparse_agent_expr (struct agent_expr *aexpr); | |
fa593d66 | 1196 | #endif |
219f2f23 PA |
1197 | static enum eval_result_type eval_agent_expr (struct tracepoint_hit_ctx *ctx, |
1198 | struct traceframe *tframe, | |
1199 | struct agent_expr *aexpr, | |
1200 | ULONGEST *rslt); | |
1201 | ||
1202 | static int agent_mem_read (struct traceframe *tframe, | |
1203 | unsigned char *to, CORE_ADDR from, ULONGEST len); | |
1204 | static int agent_tsv_read (struct traceframe *tframe, int n); | |
1205 | ||
fa593d66 | 1206 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1207 | static CORE_ADDR traceframe_get_pc (struct traceframe *tframe); |
1208 | static int traceframe_read_tsv (int num, LONGEST *val); | |
fa593d66 | 1209 | #endif |
219f2f23 PA |
1210 | |
1211 | static int condition_true_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
1212 | struct tracepoint *tpoint); | |
1213 | ||
fa593d66 | 1214 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1215 | static void clear_readonly_regions (void); |
1216 | static void clear_installed_tracepoints (void); | |
fa593d66 | 1217 | #endif |
219f2f23 PA |
1218 | |
1219 | static void collect_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
1220 | CORE_ADDR stop_pc, | |
1221 | struct tracepoint *tpoint); | |
fa593d66 | 1222 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1223 | static void collect_data_at_step (struct tracepoint_hit_ctx *ctx, |
1224 | CORE_ADDR stop_pc, | |
1225 | struct tracepoint *tpoint, int current_step); | |
6a271cae PA |
1226 | static void compile_tracepoint_condition (struct tracepoint *tpoint, |
1227 | CORE_ADDR *jump_entry); | |
fa593d66 | 1228 | #endif |
219f2f23 PA |
1229 | static void do_action_at_tracepoint (struct tracepoint_hit_ctx *ctx, |
1230 | CORE_ADDR stop_pc, | |
1231 | struct tracepoint *tpoint, | |
1232 | struct traceframe *tframe, | |
1233 | struct tracepoint_action *taction); | |
1234 | ||
fa593d66 PA |
1235 | #ifndef IN_PROCESS_AGENT |
1236 | static struct tracepoint *fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR); | |
1237 | #endif | |
1238 | ||
1239 | #if defined(__GNUC__) | |
1240 | # define memory_barrier() asm volatile ("" : : : "memory") | |
1241 | #else | |
1242 | # define memory_barrier() do {} while (0) | |
1243 | #endif | |
1244 | ||
1245 | /* We only build the IPA if this builtin is supported, and there are | |
1246 | no uses of this in GDBserver itself, so we're safe in defining this | |
1247 | unconditionally. */ | |
1248 | #define cmpxchg(mem, oldval, newval) \ | |
1249 | __sync_val_compare_and_swap (mem, oldval, newval) | |
1250 | ||
0fb4aa4b PA |
1251 | /* The size in bytes of the buffer used to talk to the IPA helper |
1252 | thread. */ | |
1253 | #define CMD_BUF_SIZE 1024 | |
1254 | ||
219f2f23 PA |
1255 | /* Record that an error occurred during expression evaluation. */ |
1256 | ||
1257 | static void | |
1258 | record_tracepoint_error (struct tracepoint *tpoint, const char *which, | |
1259 | enum eval_result_type rtype) | |
1260 | { | |
1261 | trace_debug ("Tracepoint %d at %s %s eval reports error %d", | |
1262 | tpoint->number, paddress (tpoint->address), which, rtype); | |
1263 | ||
fa593d66 PA |
1264 | #ifdef IN_PROCESS_AGENT |
1265 | /* Only record the first error we get. */ | |
1266 | if (cmpxchg (&expr_eval_result, | |
1267 | expr_eval_no_error, | |
1268 | rtype) != expr_eval_no_error) | |
1269 | return; | |
1270 | #else | |
1271 | if (expr_eval_result != expr_eval_no_error) | |
1272 | return; | |
1273 | #endif | |
1274 | ||
219f2f23 PA |
1275 | error_tracepoint = tpoint; |
1276 | } | |
1277 | ||
1278 | /* Trace buffer management. */ | |
1279 | ||
1280 | static void | |
1281 | clear_trace_buffer (void) | |
1282 | { | |
1283 | trace_buffer_start = trace_buffer_lo; | |
1284 | trace_buffer_free = trace_buffer_lo; | |
1285 | trace_buffer_end_free = trace_buffer_hi; | |
1286 | trace_buffer_wrap = trace_buffer_hi; | |
1287 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1288 | ((struct traceframe *) trace_buffer_free)->tpnum = 0; | |
1289 | ((struct traceframe *) trace_buffer_free)->data_size = 0; | |
1290 | traceframe_read_count = traceframe_write_count = 0; | |
1291 | traceframes_created = 0; | |
1292 | } | |
1293 | ||
fa593d66 PA |
1294 | #ifndef IN_PROCESS_AGENT |
1295 | ||
1296 | static void | |
1297 | clear_inferior_trace_buffer (void) | |
1298 | { | |
1299 | CORE_ADDR ipa_trace_buffer_lo; | |
1300 | CORE_ADDR ipa_trace_buffer_hi; | |
1301 | struct traceframe ipa_traceframe = { 0 }; | |
1302 | struct ipa_trace_buffer_control ipa_trace_buffer_ctrl; | |
1303 | ||
1304 | read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_lo, | |
1305 | &ipa_trace_buffer_lo); | |
1306 | read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_hi, | |
1307 | &ipa_trace_buffer_hi); | |
1308 | ||
1309 | ipa_trace_buffer_ctrl.start = ipa_trace_buffer_lo; | |
1310 | ipa_trace_buffer_ctrl.free = ipa_trace_buffer_lo; | |
1311 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_hi; | |
1312 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
1313 | ||
1314 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1315 | write_inferior_memory (ipa_sym_addrs.addr_trace_buffer_ctrl, | |
1316 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
1317 | sizeof (ipa_trace_buffer_ctrl)); | |
1318 | ||
1319 | write_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, 0); | |
1320 | ||
1321 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1322 | write_inferior_memory (ipa_trace_buffer_lo, | |
1323 | (unsigned char *) &ipa_traceframe, | |
1324 | sizeof (ipa_traceframe)); | |
1325 | ||
1326 | write_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, 0); | |
1327 | write_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, 0); | |
1328 | write_inferior_integer (ipa_sym_addrs.addr_traceframes_created, 0); | |
1329 | } | |
1330 | ||
1331 | #endif | |
1332 | ||
219f2f23 PA |
1333 | static void |
1334 | init_trace_buffer (unsigned char *buf, int bufsize) | |
1335 | { | |
1336 | trace_buffer_lo = buf; | |
1337 | trace_buffer_hi = trace_buffer_lo + bufsize; | |
1338 | ||
1339 | clear_trace_buffer (); | |
1340 | } | |
1341 | ||
fa593d66 PA |
1342 | #ifdef IN_PROCESS_AGENT |
1343 | ||
1344 | IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE | |
1345 | about_to_request_buffer_space (void) | |
1346 | { | |
1347 | /* GDBserver places breakpoint here while it goes about to flush | |
1348 | data at random times. */ | |
1349 | UNKNOWN_SIDE_EFFECTS(); | |
1350 | } | |
1351 | ||
1352 | #endif | |
1353 | ||
219f2f23 PA |
1354 | /* Carve out a piece of the trace buffer, returning NULL in case of |
1355 | failure. */ | |
1356 | ||
1357 | static void * | |
1358 | trace_buffer_alloc (size_t amt) | |
1359 | { | |
1360 | unsigned char *rslt; | |
fa593d66 PA |
1361 | struct trace_buffer_control *tbctrl; |
1362 | unsigned int curr; | |
1363 | #ifdef IN_PROCESS_AGENT | |
1364 | unsigned int prev, prev_filtered; | |
1365 | unsigned int commit_count; | |
1366 | unsigned int commit; | |
1367 | unsigned int readout; | |
1368 | #else | |
219f2f23 PA |
1369 | struct traceframe *oldest; |
1370 | unsigned char *new_start; | |
fa593d66 | 1371 | #endif |
219f2f23 PA |
1372 | |
1373 | trace_debug ("Want to allocate %ld+%ld bytes in trace buffer", | |
1374 | (long) amt, (long) sizeof (struct traceframe)); | |
1375 | ||
1376 | /* Account for the EOB marker. */ | |
1377 | amt += sizeof (struct traceframe); | |
1378 | ||
fa593d66 PA |
1379 | #ifdef IN_PROCESS_AGENT |
1380 | again: | |
1381 | memory_barrier (); | |
1382 | ||
1383 | /* Read the current token and extract the index to try to write to, | |
1384 | storing it in CURR. */ | |
1385 | prev = trace_buffer_ctrl_curr; | |
1386 | prev_filtered = prev & ~GDBSERVER_FLUSH_COUNT_MASK; | |
1387 | curr = prev_filtered + 1; | |
1388 | if (curr > 2) | |
1389 | curr = 0; | |
1390 | ||
1391 | about_to_request_buffer_space (); | |
1392 | ||
1393 | /* Start out with a copy of the current state. GDBserver may be | |
1394 | midway writing to the PREV_FILTERED TBC, but, that's OK, we won't | |
1395 | be able to commit anyway if that happens. */ | |
1396 | trace_buffer_ctrl[curr] | |
1397 | = trace_buffer_ctrl[prev_filtered]; | |
1398 | trace_debug ("trying curr=%u", curr); | |
1399 | #else | |
1400 | /* The GDBserver's agent doesn't need all that syncing, and always | |
1401 | updates TCB 0 (there's only one, mind you). */ | |
1402 | curr = 0; | |
1403 | #endif | |
1404 | tbctrl = &trace_buffer_ctrl[curr]; | |
1405 | ||
219f2f23 PA |
1406 | /* Offsets are easier to grok for debugging than raw addresses, |
1407 | especially for the small trace buffer sizes that are useful for | |
1408 | testing. */ | |
fa593d66 PA |
1409 | trace_debug ("Trace buffer [%d] start=%d free=%d endfree=%d wrap=%d hi=%d", |
1410 | curr, | |
1411 | (int) (tbctrl->start - trace_buffer_lo), | |
1412 | (int) (tbctrl->free - trace_buffer_lo), | |
1413 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1414 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1415 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1416 | ||
1417 | /* The algorithm here is to keep trying to get a contiguous block of | |
1418 | the requested size, possibly discarding older traceframes to free | |
1419 | up space. Since free space might come in one or two pieces, | |
1420 | depending on whether discarded traceframes wrapped around at the | |
1421 | high end of the buffer, we test both pieces after each | |
1422 | discard. */ | |
1423 | while (1) | |
1424 | { | |
1425 | /* First, if we have two free parts, try the upper one first. */ | |
fa593d66 | 1426 | if (tbctrl->end_free < tbctrl->free) |
219f2f23 | 1427 | { |
fa593d66 | 1428 | if (tbctrl->free + amt <= trace_buffer_hi) |
219f2f23 PA |
1429 | /* We have enough in the upper part. */ |
1430 | break; | |
1431 | else | |
1432 | { | |
1433 | /* Our high part of free space wasn't enough. Give up | |
1434 | on it for now, set wraparound. We will recover the | |
1435 | space later, if/when the wrapped-around traceframe is | |
1436 | discarded. */ | |
1437 | trace_debug ("Upper part too small, setting wraparound"); | |
fa593d66 PA |
1438 | tbctrl->wrap = tbctrl->free; |
1439 | tbctrl->free = trace_buffer_lo; | |
219f2f23 PA |
1440 | } |
1441 | } | |
1442 | ||
1443 | /* The normal case. */ | |
fa593d66 | 1444 | if (tbctrl->free + amt <= tbctrl->end_free) |
219f2f23 PA |
1445 | break; |
1446 | ||
fa593d66 PA |
1447 | #ifdef IN_PROCESS_AGENT |
1448 | /* The IP Agent's buffer is always circular. It isn't used | |
1449 | currently, but `circular_trace_buffer' could represent | |
1450 | GDBserver's mode. If we didn't find space, ask GDBserver to | |
1451 | flush. */ | |
1452 | ||
1453 | flush_trace_buffer (); | |
1454 | memory_barrier (); | |
1455 | if (tracing) | |
1456 | { | |
1457 | trace_debug ("gdbserver flushed buffer, retrying"); | |
1458 | goto again; | |
1459 | } | |
1460 | ||
1461 | /* GDBserver cancelled the tracing. Bail out as well. */ | |
1462 | return NULL; | |
1463 | #else | |
219f2f23 PA |
1464 | /* If we're here, then neither part is big enough, and |
1465 | non-circular trace buffers are now full. */ | |
1466 | if (!circular_trace_buffer) | |
1467 | { | |
1468 | trace_debug ("Not enough space in the trace buffer"); | |
1469 | return NULL; | |
1470 | } | |
1471 | ||
1472 | trace_debug ("Need more space in the trace buffer"); | |
1473 | ||
1474 | /* If we have a circular buffer, we can try discarding the | |
1475 | oldest traceframe and see if that helps. */ | |
1476 | oldest = FIRST_TRACEFRAME (); | |
1477 | if (oldest->tpnum == 0) | |
1478 | { | |
1479 | /* Not good; we have no traceframes to free. Perhaps we're | |
1480 | asking for a block that is larger than the buffer? In | |
1481 | any case, give up. */ | |
1482 | trace_debug ("No traceframes to discard"); | |
1483 | return NULL; | |
1484 | } | |
1485 | ||
fa593d66 PA |
1486 | /* We don't run this code in the in-process agent currently. |
1487 | E.g., we could leave the in-process agent in autonomous | |
1488 | circular mode if we only have fast tracepoints. If we do | |
1489 | that, then this bit becomes racy with GDBserver, which also | |
1490 | writes to this counter. */ | |
219f2f23 PA |
1491 | --traceframe_write_count; |
1492 | ||
1493 | new_start = (unsigned char *) NEXT_TRACEFRAME (oldest); | |
1494 | /* If we freed the traceframe that wrapped around, go back | |
1495 | to the non-wrap case. */ | |
fa593d66 | 1496 | if (new_start < tbctrl->start) |
219f2f23 PA |
1497 | { |
1498 | trace_debug ("Discarding past the wraparound"); | |
fa593d66 | 1499 | tbctrl->wrap = trace_buffer_hi; |
219f2f23 | 1500 | } |
fa593d66 PA |
1501 | tbctrl->start = new_start; |
1502 | tbctrl->end_free = tbctrl->start; | |
219f2f23 PA |
1503 | |
1504 | trace_debug ("Discarded a traceframe\n" | |
fa593d66 PA |
1505 | "Trace buffer [%d], start=%d free=%d " |
1506 | "endfree=%d wrap=%d hi=%d", | |
1507 | curr, | |
1508 | (int) (tbctrl->start - trace_buffer_lo), | |
1509 | (int) (tbctrl->free - trace_buffer_lo), | |
1510 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1511 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1512 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1513 | ||
1514 | /* Now go back around the loop. The discard might have resulted | |
1515 | in either one or two pieces of free space, so we want to try | |
1516 | both before freeing any more traceframes. */ | |
fa593d66 | 1517 | #endif |
219f2f23 PA |
1518 | } |
1519 | ||
1520 | /* If we get here, we know we can provide the asked-for space. */ | |
1521 | ||
fa593d66 | 1522 | rslt = tbctrl->free; |
219f2f23 PA |
1523 | |
1524 | /* Adjust the request back down, now that we know we have space for | |
fa593d66 PA |
1525 | the marker, but don't commit to AMT yet, we may still need to |
1526 | restart the operation if GDBserver touches the trace buffer | |
1527 | (obviously only important in the in-process agent's version). */ | |
1528 | tbctrl->free += (amt - sizeof (struct traceframe)); | |
1529 | ||
1530 | /* Or not. If GDBserver changed the trace buffer behind our back, | |
1531 | we get to restart a new allocation attempt. */ | |
1532 | ||
1533 | #ifdef IN_PROCESS_AGENT | |
1534 | /* Build the tentative token. */ | |
1535 | commit_count = (((prev & 0x0007ff00) + 0x100) & 0x0007ff00); | |
1536 | commit = (((prev & 0x0007ff00) << 12) | |
1537 | | commit_count | |
1538 | | curr); | |
1539 | ||
1540 | /* Try to commit it. */ | |
1541 | readout = cmpxchg (&trace_buffer_ctrl_curr, prev, commit); | |
1542 | if (readout != prev) | |
1543 | { | |
1544 | trace_debug ("GDBserver has touched the trace buffer, restarting." | |
1545 | " (prev=%08x, commit=%08x, readout=%08x)", | |
1546 | prev, commit, readout); | |
1547 | goto again; | |
1548 | } | |
219f2f23 | 1549 | |
fa593d66 PA |
1550 | /* Hold your horses here. Even if that change was committed, |
1551 | GDBserver could come in, and clobber it. We need to hold to be | |
1552 | able to tell if GDBserver clobbers before or after we committed | |
1553 | the change. Whenever GDBserver goes about touching the IPA | |
1554 | buffer, it sets a breakpoint in this routine, so we have a sync | |
1555 | point here. */ | |
1556 | about_to_request_buffer_space (); | |
219f2f23 | 1557 | |
fa593d66 PA |
1558 | /* Check if the change has been effective, even if GDBserver stopped |
1559 | us at the breakpoint. */ | |
219f2f23 | 1560 | |
fa593d66 PA |
1561 | { |
1562 | unsigned int refetch; | |
219f2f23 | 1563 | |
fa593d66 PA |
1564 | memory_barrier (); |
1565 | ||
1566 | refetch = trace_buffer_ctrl_curr; | |
1567 | ||
1568 | if ((refetch == commit | |
1569 | || ((refetch & 0x7ff00000) >> 12) == commit_count)) | |
1570 | { | |
1571 | /* effective */ | |
1572 | trace_debug ("change is effective: (prev=%08x, commit=%08x, " | |
1573 | "readout=%08x, refetch=%08x)", | |
1574 | prev, commit, readout, refetch); | |
1575 | } | |
1576 | else | |
1577 | { | |
1578 | trace_debug ("GDBserver has touched the trace buffer, not effective." | |
1579 | " (prev=%08x, commit=%08x, readout=%08x, refetch=%08x)", | |
1580 | prev, commit, readout, refetch); | |
1581 | goto again; | |
1582 | } | |
1583 | } | |
1584 | #endif | |
1585 | ||
1586 | /* We have a new piece of the trace buffer. Hurray! */ | |
1587 | ||
1588 | /* Add an EOB marker just past this allocation. */ | |
1589 | ((struct traceframe *) tbctrl->free)->tpnum = 0; | |
1590 | ((struct traceframe *) tbctrl->free)->data_size = 0; | |
1591 | ||
1592 | /* Adjust the request back down, now that we know we have space for | |
1593 | the marker. */ | |
1594 | amt -= sizeof (struct traceframe); | |
1595 | ||
1596 | if (debug_threads) | |
1597 | { | |
219f2f23 | 1598 | trace_debug ("Allocated %d bytes", (int) amt); |
fa593d66 PA |
1599 | trace_debug ("Trace buffer [%d] start=%d free=%d " |
1600 | "endfree=%d wrap=%d hi=%d", | |
1601 | curr, | |
1602 | (int) (tbctrl->start - trace_buffer_lo), | |
1603 | (int) (tbctrl->free - trace_buffer_lo), | |
1604 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1605 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1606 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1607 | } | |
1608 | ||
1609 | return rslt; | |
1610 | } | |
1611 | ||
fa593d66 PA |
1612 | #ifndef IN_PROCESS_AGENT |
1613 | ||
219f2f23 PA |
1614 | /* Return the total free space. This is not necessarily the largest |
1615 | block we can allocate, because of the two-part case. */ | |
1616 | ||
1617 | static int | |
1618 | free_space (void) | |
1619 | { | |
1620 | if (trace_buffer_free <= trace_buffer_end_free) | |
1621 | return trace_buffer_end_free - trace_buffer_free; | |
1622 | else | |
1623 | return ((trace_buffer_end_free - trace_buffer_lo) | |
1624 | + (trace_buffer_hi - trace_buffer_free)); | |
1625 | } | |
1626 | ||
1627 | /* An 'S' in continuation packets indicates remainder are for | |
1628 | while-stepping. */ | |
1629 | ||
1630 | static int seen_step_action_flag; | |
1631 | ||
1632 | /* Create a tracepoint (location) with given number and address. */ | |
1633 | ||
1634 | static struct tracepoint * | |
1635 | add_tracepoint (int num, CORE_ADDR addr) | |
1636 | { | |
1637 | struct tracepoint *tpoint; | |
1638 | ||
1639 | tpoint = xmalloc (sizeof (struct tracepoint)); | |
1640 | tpoint->number = num; | |
1641 | tpoint->address = addr; | |
1642 | tpoint->numactions = 0; | |
1643 | tpoint->actions = NULL; | |
1644 | tpoint->actions_str = NULL; | |
1645 | tpoint->cond = NULL; | |
1646 | tpoint->num_step_actions = 0; | |
1647 | tpoint->step_actions = NULL; | |
1648 | tpoint->step_actions_str = NULL; | |
fa593d66 PA |
1649 | /* Start all off as regular (slow) tracepoints. */ |
1650 | tpoint->type = trap_tracepoint; | |
1651 | tpoint->orig_size = -1; | |
219f2f23 | 1652 | tpoint->source_strings = NULL; |
6a271cae | 1653 | tpoint->compiled_cond = 0; |
219f2f23 PA |
1654 | tpoint->handle = NULL; |
1655 | tpoint->next = NULL; | |
1656 | ||
1657 | if (!last_tracepoint) | |
1658 | tracepoints = tpoint; | |
1659 | else | |
1660 | last_tracepoint->next = tpoint; | |
1661 | last_tracepoint = tpoint; | |
1662 | ||
1663 | seen_step_action_flag = 0; | |
1664 | ||
1665 | return tpoint; | |
1666 | } | |
1667 | ||
fa593d66 PA |
1668 | #ifndef IN_PROCESS_AGENT |
1669 | ||
219f2f23 PA |
1670 | /* Return the tracepoint with the given number and address, or NULL. */ |
1671 | ||
1672 | static struct tracepoint * | |
1673 | find_tracepoint (int id, CORE_ADDR addr) | |
1674 | { | |
1675 | struct tracepoint *tpoint; | |
1676 | ||
1677 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
1678 | if (tpoint->number == id && tpoint->address == addr) | |
1679 | return tpoint; | |
1680 | ||
1681 | return NULL; | |
1682 | } | |
1683 | ||
1684 | /* There may be several tracepoints with the same number (because they | |
1685 | are "locations", in GDB parlance); return the next one after the | |
1686 | given tracepoint, or search from the beginning of the list if the | |
1687 | first argument is NULL. */ | |
1688 | ||
1689 | static struct tracepoint * | |
1690 | find_next_tracepoint_by_number (struct tracepoint *prev_tp, int num) | |
1691 | { | |
1692 | struct tracepoint *tpoint; | |
1693 | ||
1694 | if (prev_tp) | |
1695 | tpoint = prev_tp->next; | |
1696 | else | |
1697 | tpoint = tracepoints; | |
1698 | for (; tpoint; tpoint = tpoint->next) | |
1699 | if (tpoint->number == num) | |
1700 | return tpoint; | |
1701 | ||
1702 | return NULL; | |
1703 | } | |
1704 | ||
fa593d66 PA |
1705 | #endif |
1706 | ||
219f2f23 PA |
1707 | static char * |
1708 | save_string (const char *str, size_t len) | |
1709 | { | |
1710 | char *s; | |
1711 | ||
1712 | s = xmalloc (len + 1); | |
1713 | memcpy (s, str, len); | |
1714 | s[len] = '\0'; | |
1715 | ||
1716 | return s; | |
1717 | } | |
1718 | ||
1719 | /* Append another action to perform when the tracepoint triggers. */ | |
1720 | ||
1721 | static void | |
1722 | add_tracepoint_action (struct tracepoint *tpoint, char *packet) | |
1723 | { | |
1724 | char *act; | |
1725 | ||
1726 | if (*packet == 'S') | |
1727 | { | |
1728 | seen_step_action_flag = 1; | |
1729 | ++packet; | |
1730 | } | |
1731 | ||
1732 | act = packet; | |
1733 | ||
1734 | while (*act) | |
1735 | { | |
1736 | char *act_start = act; | |
1737 | struct tracepoint_action *action = NULL; | |
1738 | ||
1739 | switch (*act) | |
1740 | { | |
1741 | case 'M': | |
1742 | { | |
1743 | struct collect_memory_action *maction; | |
1744 | ULONGEST basereg; | |
1745 | int is_neg; | |
1746 | ||
1747 | maction = xmalloc (sizeof *maction); | |
1748 | maction->base.type = *act; | |
1749 | action = &maction->base; | |
1750 | ||
1751 | ++act; | |
1752 | is_neg = (*act == '-'); | |
1753 | if (*act == '-') | |
1754 | ++act; | |
1755 | act = unpack_varlen_hex (act, &basereg); | |
1756 | ++act; | |
1757 | act = unpack_varlen_hex (act, &maction->addr); | |
1758 | ++act; | |
1759 | act = unpack_varlen_hex (act, &maction->len); | |
1760 | maction->basereg = (is_neg | |
1761 | ? - (int) basereg | |
1762 | : (int) basereg); | |
1763 | trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)", | |
1764 | pulongest (maction->len), | |
1765 | paddress (maction->addr), maction->basereg); | |
1766 | break; | |
1767 | } | |
1768 | case 'R': | |
1769 | { | |
1770 | struct collect_registers_action *raction; | |
1771 | ||
1772 | raction = xmalloc (sizeof *raction); | |
1773 | raction->base.type = *act; | |
1774 | action = &raction->base; | |
1775 | ||
1776 | trace_debug ("Want to collect registers"); | |
1777 | ++act; | |
1778 | /* skip past hex digits of mask for now */ | |
1779 | while (isxdigit(*act)) | |
1780 | ++act; | |
1781 | break; | |
1782 | } | |
0fb4aa4b PA |
1783 | case 'L': |
1784 | { | |
1785 | struct collect_static_trace_data_action *raction; | |
1786 | ||
1787 | raction = xmalloc (sizeof *raction); | |
1788 | raction->base.type = *act; | |
1789 | action = &raction->base; | |
1790 | ||
1791 | trace_debug ("Want to collect static trace data"); | |
1792 | ++act; | |
1793 | break; | |
1794 | } | |
219f2f23 PA |
1795 | case 'S': |
1796 | trace_debug ("Unexpected step action, ignoring"); | |
1797 | ++act; | |
1798 | break; | |
1799 | case 'X': | |
1800 | { | |
1801 | struct eval_expr_action *xaction; | |
1802 | ||
1803 | xaction = xmalloc (sizeof (*xaction)); | |
1804 | xaction->base.type = *act; | |
1805 | action = &xaction->base; | |
1806 | ||
1807 | trace_debug ("Want to evaluate expression"); | |
1808 | xaction->expr = parse_agent_expr (&act); | |
1809 | break; | |
1810 | } | |
1811 | default: | |
1812 | trace_debug ("unknown trace action '%c', ignoring...", *act); | |
1813 | break; | |
1814 | case '-': | |
1815 | break; | |
1816 | } | |
1817 | ||
1818 | if (action == NULL) | |
1819 | break; | |
1820 | ||
1821 | if (seen_step_action_flag) | |
1822 | { | |
1823 | tpoint->num_step_actions++; | |
1824 | ||
1825 | tpoint->step_actions | |
1826 | = xrealloc (tpoint->step_actions, | |
1827 | (sizeof (*tpoint->step_actions) | |
1828 | * tpoint->num_step_actions)); | |
1829 | tpoint->step_actions_str | |
1830 | = xrealloc (tpoint->step_actions_str, | |
1831 | (sizeof (*tpoint->step_actions_str) | |
1832 | * tpoint->num_step_actions)); | |
1833 | tpoint->step_actions[tpoint->num_step_actions - 1] = action; | |
1834 | tpoint->step_actions_str[tpoint->num_step_actions - 1] | |
1835 | = save_string (act_start, act - act_start); | |
1836 | } | |
1837 | else | |
1838 | { | |
1839 | tpoint->numactions++; | |
1840 | tpoint->actions | |
1841 | = xrealloc (tpoint->actions, | |
1842 | sizeof (*tpoint->actions) * tpoint->numactions); | |
1843 | tpoint->actions_str | |
1844 | = xrealloc (tpoint->actions_str, | |
1845 | sizeof (*tpoint->actions_str) * tpoint->numactions); | |
1846 | tpoint->actions[tpoint->numactions - 1] = action; | |
1847 | tpoint->actions_str[tpoint->numactions - 1] | |
1848 | = save_string (act_start, act - act_start); | |
1849 | } | |
1850 | } | |
1851 | } | |
1852 | ||
fa593d66 PA |
1853 | #endif |
1854 | ||
219f2f23 PA |
1855 | /* Find or create a trace state variable with the given number. */ |
1856 | ||
1857 | static struct trace_state_variable * | |
1858 | get_trace_state_variable (int num) | |
1859 | { | |
1860 | struct trace_state_variable *tsv; | |
1861 | ||
fa593d66 PA |
1862 | #ifdef IN_PROCESS_AGENT |
1863 | /* Search for an existing variable. */ | |
1864 | for (tsv = alloced_trace_state_variables; tsv; tsv = tsv->next) | |
1865 | if (tsv->number == num) | |
1866 | return tsv; | |
1867 | #endif | |
1868 | ||
219f2f23 PA |
1869 | /* Search for an existing variable. */ |
1870 | for (tsv = trace_state_variables; tsv; tsv = tsv->next) | |
1871 | if (tsv->number == num) | |
1872 | return tsv; | |
1873 | ||
1874 | return NULL; | |
1875 | } | |
1876 | ||
1877 | /* Find or create a trace state variable with the given number. */ | |
1878 | ||
1879 | static struct trace_state_variable * | |
fa593d66 | 1880 | create_trace_state_variable (int num, int gdb) |
219f2f23 PA |
1881 | { |
1882 | struct trace_state_variable *tsv; | |
1883 | ||
1884 | tsv = get_trace_state_variable (num); | |
1885 | if (tsv != NULL) | |
1886 | return tsv; | |
1887 | ||
1888 | /* Create a new variable. */ | |
1889 | tsv = xmalloc (sizeof (struct trace_state_variable)); | |
1890 | tsv->number = num; | |
1891 | tsv->initial_value = 0; | |
1892 | tsv->value = 0; | |
1893 | tsv->getter = NULL; | |
1894 | tsv->name = NULL; | |
fa593d66 PA |
1895 | #ifdef IN_PROCESS_AGENT |
1896 | if (!gdb) | |
1897 | { | |
1898 | tsv->next = alloced_trace_state_variables; | |
1899 | alloced_trace_state_variables = tsv; | |
1900 | } | |
1901 | else | |
1902 | #endif | |
1903 | { | |
1904 | tsv->next = trace_state_variables; | |
1905 | trace_state_variables = tsv; | |
1906 | } | |
219f2f23 PA |
1907 | return tsv; |
1908 | } | |
1909 | ||
6a271cae | 1910 | IP_AGENT_EXPORT LONGEST |
219f2f23 PA |
1911 | get_trace_state_variable_value (int num) |
1912 | { | |
1913 | struct trace_state_variable *tsv; | |
1914 | ||
1915 | tsv = get_trace_state_variable (num); | |
1916 | ||
1917 | if (!tsv) | |
1918 | { | |
1919 | trace_debug ("No trace state variable %d, skipping value get", num); | |
1920 | return 0; | |
1921 | } | |
1922 | ||
1923 | /* Call a getter function if we have one. While it's tempting to | |
1924 | set up something to only call the getter once per tracepoint hit, | |
1925 | it could run afoul of thread races. Better to let the getter | |
1926 | handle it directly, if necessary to worry about it. */ | |
1927 | if (tsv->getter) | |
1928 | tsv->value = (tsv->getter) (); | |
1929 | ||
1930 | trace_debug ("get_trace_state_variable_value(%d) ==> %s", | |
1931 | num, plongest (tsv->value)); | |
1932 | ||
1933 | return tsv->value; | |
1934 | } | |
1935 | ||
6a271cae | 1936 | IP_AGENT_EXPORT void |
219f2f23 PA |
1937 | set_trace_state_variable_value (int num, LONGEST val) |
1938 | { | |
1939 | struct trace_state_variable *tsv; | |
1940 | ||
1941 | tsv = get_trace_state_variable (num); | |
1942 | ||
1943 | if (!tsv) | |
1944 | { | |
1945 | trace_debug ("No trace state variable %d, skipping value set", num); | |
1946 | return; | |
1947 | } | |
1948 | ||
1949 | tsv->value = val; | |
1950 | } | |
1951 | ||
1952 | static void | |
1953 | set_trace_state_variable_name (int num, const char *name) | |
1954 | { | |
1955 | struct trace_state_variable *tsv; | |
1956 | ||
1957 | tsv = get_trace_state_variable (num); | |
1958 | ||
1959 | if (!tsv) | |
1960 | { | |
1961 | trace_debug ("No trace state variable %d, skipping name set", num); | |
1962 | return; | |
1963 | } | |
1964 | ||
1965 | tsv->name = (char *) name; | |
1966 | } | |
1967 | ||
1968 | static void | |
1969 | set_trace_state_variable_getter (int num, LONGEST (*getter) (void)) | |
1970 | { | |
1971 | struct trace_state_variable *tsv; | |
1972 | ||
1973 | tsv = get_trace_state_variable (num); | |
1974 | ||
1975 | if (!tsv) | |
1976 | { | |
1977 | trace_debug ("No trace state variable %d, skipping getter set", num); | |
1978 | return; | |
1979 | } | |
1980 | ||
1981 | tsv->getter = getter; | |
1982 | } | |
1983 | ||
1984 | /* Add a raw traceframe for the given tracepoint. */ | |
1985 | ||
1986 | static struct traceframe * | |
1987 | add_traceframe (struct tracepoint *tpoint) | |
1988 | { | |
1989 | struct traceframe *tframe; | |
1990 | ||
1991 | tframe = trace_buffer_alloc (sizeof (struct traceframe)); | |
1992 | ||
1993 | if (tframe == NULL) | |
1994 | return NULL; | |
1995 | ||
1996 | tframe->tpnum = tpoint->number; | |
1997 | tframe->data_size = 0; | |
1998 | ||
1999 | return tframe; | |
2000 | } | |
2001 | ||
2002 | /* Add a block to the traceframe currently being worked on. */ | |
2003 | ||
2004 | static unsigned char * | |
2005 | add_traceframe_block (struct traceframe *tframe, int amt) | |
2006 | { | |
2007 | unsigned char *block; | |
2008 | ||
2009 | if (!tframe) | |
2010 | return NULL; | |
2011 | ||
2012 | block = trace_buffer_alloc (amt); | |
2013 | ||
2014 | if (!block) | |
2015 | return NULL; | |
2016 | ||
2017 | tframe->data_size += amt; | |
2018 | ||
2019 | return block; | |
2020 | } | |
2021 | ||
2022 | /* Flag that the current traceframe is finished. */ | |
2023 | ||
2024 | static void | |
2025 | finish_traceframe (struct traceframe *tframe) | |
2026 | { | |
2027 | ++traceframe_write_count; | |
2028 | ++traceframes_created; | |
2029 | } | |
2030 | ||
fa593d66 PA |
2031 | #ifndef IN_PROCESS_AGENT |
2032 | ||
219f2f23 PA |
2033 | /* Given a traceframe number NUM, find the NUMth traceframe in the |
2034 | buffer. */ | |
2035 | ||
2036 | static struct traceframe * | |
2037 | find_traceframe (int num) | |
2038 | { | |
2039 | struct traceframe *tframe; | |
2040 | int tfnum = 0; | |
2041 | ||
2042 | for (tframe = FIRST_TRACEFRAME (); | |
2043 | tframe->tpnum != 0; | |
2044 | tframe = NEXT_TRACEFRAME (tframe)) | |
2045 | { | |
2046 | if (tfnum == num) | |
2047 | return tframe; | |
2048 | ++tfnum; | |
2049 | } | |
2050 | ||
2051 | return NULL; | |
2052 | } | |
2053 | ||
2054 | static CORE_ADDR | |
2055 | get_traceframe_address (struct traceframe *tframe) | |
2056 | { | |
2057 | CORE_ADDR addr; | |
2058 | struct tracepoint *tpoint; | |
2059 | ||
2060 | addr = traceframe_get_pc (tframe); | |
2061 | ||
2062 | if (addr) | |
2063 | return addr; | |
2064 | ||
2065 | /* Fallback strategy, will be incorrect for while-stepping frames | |
2066 | and multi-location tracepoints. */ | |
2067 | tpoint = find_next_tracepoint_by_number (NULL, tframe->tpnum); | |
2068 | return tpoint->address; | |
2069 | } | |
2070 | ||
2071 | /* Search for the next traceframe whose address is inside or outside | |
2072 | the given range. */ | |
2073 | ||
2074 | static struct traceframe * | |
2075 | find_next_traceframe_in_range (CORE_ADDR lo, CORE_ADDR hi, int inside_p, | |
2076 | int *tfnump) | |
2077 | { | |
2078 | struct traceframe *tframe; | |
2079 | CORE_ADDR tfaddr; | |
2080 | ||
2081 | *tfnump = current_traceframe + 1; | |
2082 | tframe = find_traceframe (*tfnump); | |
2083 | /* The search is not supposed to wrap around. */ | |
2084 | if (!tframe) | |
2085 | { | |
2086 | *tfnump = -1; | |
2087 | return NULL; | |
2088 | } | |
2089 | ||
2090 | for (; tframe->tpnum != 0; tframe = NEXT_TRACEFRAME (tframe)) | |
2091 | { | |
2092 | tfaddr = get_traceframe_address (tframe); | |
2093 | if (inside_p | |
2094 | ? (lo <= tfaddr && tfaddr <= hi) | |
2095 | : (lo > tfaddr || tfaddr > hi)) | |
2096 | return tframe; | |
2097 | ++*tfnump; | |
2098 | } | |
2099 | ||
2100 | *tfnump = -1; | |
2101 | return NULL; | |
2102 | } | |
2103 | ||
2104 | /* Search for the next traceframe recorded by the given tracepoint. | |
2105 | Note that for multi-location tracepoints, this will find whatever | |
2106 | location appears first. */ | |
2107 | ||
2108 | static struct traceframe * | |
2109 | find_next_traceframe_by_tracepoint (int num, int *tfnump) | |
2110 | { | |
2111 | struct traceframe *tframe; | |
2112 | ||
2113 | *tfnump = current_traceframe + 1; | |
2114 | tframe = find_traceframe (*tfnump); | |
2115 | /* The search is not supposed to wrap around. */ | |
2116 | if (!tframe) | |
2117 | { | |
2118 | *tfnump = -1; | |
2119 | return NULL; | |
2120 | } | |
2121 | ||
2122 | for (; tframe->tpnum != 0; tframe = NEXT_TRACEFRAME (tframe)) | |
2123 | { | |
2124 | if (tframe->tpnum == num) | |
2125 | return tframe; | |
2126 | ++*tfnump; | |
2127 | } | |
2128 | ||
2129 | *tfnump = -1; | |
2130 | return NULL; | |
2131 | } | |
2132 | ||
fa593d66 PA |
2133 | #endif |
2134 | ||
2135 | #ifndef IN_PROCESS_AGENT | |
2136 | ||
219f2f23 PA |
2137 | /* Clear all past trace state. */ |
2138 | ||
2139 | static void | |
2140 | cmd_qtinit (char *packet) | |
2141 | { | |
2142 | struct trace_state_variable *tsv, *prev, *next; | |
2143 | ||
2144 | /* Make sure we don't try to read from a trace frame. */ | |
2145 | current_traceframe = -1; | |
2146 | ||
2147 | trace_debug ("Initializing the trace"); | |
2148 | ||
2149 | clear_installed_tracepoints (); | |
2150 | clear_readonly_regions (); | |
2151 | ||
2152 | tracepoints = NULL; | |
2153 | last_tracepoint = NULL; | |
2154 | ||
2155 | /* Clear out any leftover trace state variables. Ones with target | |
2156 | defined getters should be kept however. */ | |
2157 | prev = NULL; | |
2158 | tsv = trace_state_variables; | |
2159 | while (tsv) | |
2160 | { | |
2161 | trace_debug ("Looking at var %d", tsv->number); | |
2162 | if (tsv->getter == NULL) | |
2163 | { | |
2164 | next = tsv->next; | |
2165 | if (prev) | |
2166 | prev->next = next; | |
2167 | else | |
2168 | trace_state_variables = next; | |
2169 | trace_debug ("Deleting var %d", tsv->number); | |
2170 | free (tsv); | |
2171 | tsv = next; | |
2172 | } | |
2173 | else | |
2174 | { | |
2175 | prev = tsv; | |
2176 | tsv = tsv->next; | |
2177 | } | |
2178 | } | |
2179 | ||
2180 | clear_trace_buffer (); | |
fa593d66 | 2181 | clear_inferior_trace_buffer (); |
219f2f23 PA |
2182 | |
2183 | write_ok (packet); | |
2184 | } | |
2185 | ||
0fb4aa4b PA |
2186 | /* Unprobe the UST marker at ADDRESS. */ |
2187 | ||
2188 | static void | |
2189 | unprobe_marker_at (CORE_ADDR address) | |
2190 | { | |
2191 | char cmd[CMD_BUF_SIZE]; | |
2192 | ||
2193 | sprintf (cmd, "unprobe_marker_at:%s", paddress (address)); | |
2194 | run_inferior_command (cmd); | |
2195 | } | |
2196 | ||
219f2f23 PA |
2197 | /* Restore the program to its pre-tracing state. This routine may be called |
2198 | in error situations, so it needs to be careful about only restoring | |
2199 | from known-valid bits. */ | |
2200 | ||
2201 | static void | |
2202 | clear_installed_tracepoints (void) | |
2203 | { | |
2204 | struct tracepoint *tpoint; | |
2205 | struct tracepoint *prev_stpoint; | |
2206 | ||
7984d532 PA |
2207 | pause_all (1); |
2208 | cancel_breakpoints (); | |
2209 | ||
219f2f23 PA |
2210 | prev_stpoint = NULL; |
2211 | ||
2212 | /* Restore any bytes overwritten by tracepoints. */ | |
2213 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
2214 | { | |
219f2f23 PA |
2215 | /* Catch the case where we might try to remove a tracepoint that |
2216 | was never actually installed. */ | |
2217 | if (tpoint->handle == NULL) | |
2218 | { | |
2219 | trace_debug ("Tracepoint %d at 0x%s was " | |
2220 | "never installed, nothing to clear", | |
2221 | tpoint->number, paddress (tpoint->address)); | |
2222 | continue; | |
2223 | } | |
2224 | ||
fa593d66 PA |
2225 | switch (tpoint->type) |
2226 | { | |
2227 | case trap_tracepoint: | |
2228 | delete_breakpoint (tpoint->handle); | |
2229 | break; | |
2230 | case fast_tracepoint: | |
2231 | delete_fast_tracepoint_jump (tpoint->handle); | |
2232 | break; | |
0fb4aa4b PA |
2233 | case static_tracepoint: |
2234 | if (prev_stpoint != NULL | |
2235 | && prev_stpoint->address == tpoint->address) | |
2236 | /* Nothing to do. We already unprobed a tracepoint set at | |
2237 | this marker address (and there can only be one probe | |
2238 | per marker). */ | |
2239 | ; | |
2240 | else | |
2241 | { | |
2242 | unprobe_marker_at (tpoint->address); | |
2243 | prev_stpoint = tpoint; | |
2244 | } | |
2245 | break; | |
fa593d66 PA |
2246 | } |
2247 | ||
219f2f23 PA |
2248 | tpoint->handle = NULL; |
2249 | } | |
7984d532 PA |
2250 | |
2251 | unpause_all (1); | |
219f2f23 PA |
2252 | } |
2253 | ||
2254 | /* Parse a packet that defines a tracepoint. */ | |
2255 | ||
2256 | static void | |
2257 | cmd_qtdp (char *own_buf) | |
2258 | { | |
2259 | int tppacket; | |
2260 | ULONGEST num; | |
2261 | ULONGEST addr; | |
2262 | ULONGEST count; | |
2263 | struct tracepoint *tpoint; | |
2264 | char *actparm; | |
2265 | char *packet = own_buf; | |
2266 | ||
2267 | packet += strlen ("QTDP:"); | |
2268 | ||
2269 | /* A hyphen at the beginning marks a packet specifying actions for a | |
2270 | tracepoint already supplied. */ | |
2271 | tppacket = 1; | |
2272 | if (*packet == '-') | |
2273 | { | |
2274 | tppacket = 0; | |
2275 | ++packet; | |
2276 | } | |
2277 | packet = unpack_varlen_hex (packet, &num); | |
2278 | ++packet; /* skip a colon */ | |
2279 | packet = unpack_varlen_hex (packet, &addr); | |
2280 | ++packet; /* skip a colon */ | |
2281 | ||
2282 | /* See if we already have this tracepoint. */ | |
2283 | tpoint = find_tracepoint (num, addr); | |
2284 | ||
2285 | if (tppacket) | |
2286 | { | |
2287 | /* Duplicate tracepoints are never allowed. */ | |
2288 | if (tpoint) | |
2289 | { | |
2290 | trace_debug ("Tracepoint error: tracepoint %d" | |
2291 | " at 0x%s already exists", | |
2292 | (int) num, paddress (addr)); | |
2293 | write_enn (own_buf); | |
2294 | return; | |
2295 | } | |
2296 | ||
2297 | tpoint = add_tracepoint (num, addr); | |
2298 | ||
2299 | tpoint->enabled = (*packet == 'E'); | |
2300 | ++packet; /* skip 'E' */ | |
2301 | ++packet; /* skip a colon */ | |
2302 | packet = unpack_varlen_hex (packet, &count); | |
2303 | tpoint->step_count = count; | |
2304 | ++packet; /* skip a colon */ | |
2305 | packet = unpack_varlen_hex (packet, &count); | |
2306 | tpoint->pass_count = count; | |
2307 | /* See if we have any of the additional optional fields. */ | |
2308 | while (*packet == ':') | |
2309 | { | |
2310 | ++packet; | |
fa593d66 PA |
2311 | if (*packet == 'F') |
2312 | { | |
2313 | tpoint->type = fast_tracepoint; | |
2314 | ++packet; | |
2315 | packet = unpack_varlen_hex (packet, &count); | |
2316 | tpoint->orig_size = count; | |
2317 | } | |
0fb4aa4b PA |
2318 | else if (*packet == 'S') |
2319 | { | |
2320 | tpoint->type = static_tracepoint; | |
2321 | ++packet; | |
2322 | } | |
fa593d66 | 2323 | else if (*packet == 'X') |
219f2f23 PA |
2324 | { |
2325 | actparm = (char *) packet; | |
2326 | tpoint->cond = parse_agent_expr (&actparm); | |
2327 | packet = actparm; | |
2328 | } | |
2329 | else if (*packet == '-') | |
2330 | break; | |
2331 | else if (*packet == '\0') | |
2332 | break; | |
2333 | else | |
2334 | trace_debug ("Unknown optional tracepoint field"); | |
2335 | } | |
2336 | if (*packet == '-') | |
2337 | trace_debug ("Also has actions\n"); | |
2338 | ||
fa593d66 | 2339 | trace_debug ("Defined %stracepoint %d at 0x%s, " |
219f2f23 | 2340 | "enabled %d step %ld pass %ld", |
fa593d66 PA |
2341 | tpoint->type == fast_tracepoint ? "fast " |
2342 | : "", | |
2343 | tpoint->number, paddress (tpoint->address), tpoint->enabled, | |
219f2f23 PA |
2344 | tpoint->step_count, tpoint->pass_count); |
2345 | } | |
2346 | else if (tpoint) | |
2347 | add_tracepoint_action (tpoint, packet); | |
2348 | else | |
2349 | { | |
2350 | trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found", | |
2351 | (int) num, paddress (addr)); | |
2352 | write_enn (own_buf); | |
2353 | return; | |
2354 | } | |
2355 | ||
2356 | write_ok (own_buf); | |
2357 | } | |
2358 | ||
2359 | static void | |
2360 | cmd_qtdpsrc (char *own_buf) | |
2361 | { | |
2362 | ULONGEST num, addr, start, slen; | |
2363 | struct tracepoint *tpoint; | |
2364 | char *packet = own_buf; | |
2365 | char *saved, *srctype, *src; | |
2366 | size_t nbytes; | |
2367 | struct source_string *last, *newlast; | |
2368 | ||
2369 | packet += strlen ("QTDPsrc:"); | |
2370 | ||
2371 | packet = unpack_varlen_hex (packet, &num); | |
2372 | ++packet; /* skip a colon */ | |
2373 | packet = unpack_varlen_hex (packet, &addr); | |
2374 | ++packet; /* skip a colon */ | |
2375 | ||
2376 | /* See if we already have this tracepoint. */ | |
2377 | tpoint = find_tracepoint (num, addr); | |
2378 | ||
2379 | if (!tpoint) | |
2380 | { | |
2381 | trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found", | |
2382 | (int) num, paddress (addr)); | |
2383 | write_enn (own_buf); | |
2384 | return; | |
2385 | } | |
2386 | ||
2387 | saved = packet; | |
2388 | packet = strchr (packet, ':'); | |
2389 | srctype = xmalloc (packet - saved + 1); | |
2390 | memcpy (srctype, saved, packet - saved); | |
2391 | srctype[packet - saved] = '\0'; | |
2392 | ++packet; | |
2393 | packet = unpack_varlen_hex (packet, &start); | |
2394 | ++packet; /* skip a colon */ | |
2395 | packet = unpack_varlen_hex (packet, &slen); | |
2396 | ++packet; /* skip a colon */ | |
2397 | src = xmalloc (slen + 1); | |
2398 | nbytes = unhexify (src, packet, strlen (packet) / 2); | |
2399 | src[nbytes] = '\0'; | |
2400 | ||
2401 | newlast = xmalloc (sizeof (struct source_string)); | |
2402 | newlast->type = srctype; | |
2403 | newlast->str = src; | |
2404 | newlast->next = NULL; | |
2405 | /* Always add a source string to the end of the list; | |
2406 | this keeps sequences of actions/commands in the right | |
2407 | order. */ | |
2408 | if (tpoint->source_strings) | |
2409 | { | |
2410 | for (last = tpoint->source_strings; last->next; last = last->next) | |
2411 | ; | |
2412 | last->next = newlast; | |
2413 | } | |
2414 | else | |
2415 | tpoint->source_strings = newlast; | |
2416 | ||
2417 | write_ok (own_buf); | |
2418 | } | |
2419 | ||
2420 | static void | |
2421 | cmd_qtdv (char *own_buf) | |
2422 | { | |
2423 | ULONGEST num, val, builtin; | |
2424 | char *varname; | |
2425 | size_t nbytes; | |
2426 | struct trace_state_variable *tsv; | |
2427 | char *packet = own_buf; | |
2428 | ||
2429 | packet += strlen ("QTDV:"); | |
2430 | ||
2431 | packet = unpack_varlen_hex (packet, &num); | |
2432 | ++packet; /* skip a colon */ | |
2433 | packet = unpack_varlen_hex (packet, &val); | |
2434 | ++packet; /* skip a colon */ | |
2435 | packet = unpack_varlen_hex (packet, &builtin); | |
2436 | ++packet; /* skip a colon */ | |
2437 | ||
2438 | nbytes = strlen (packet) / 2; | |
2439 | varname = xmalloc (nbytes + 1); | |
2440 | nbytes = unhexify (varname, packet, nbytes); | |
2441 | varname[nbytes] = '\0'; | |
2442 | ||
fa593d66 | 2443 | tsv = create_trace_state_variable (num, 1); |
219f2f23 PA |
2444 | tsv->initial_value = (LONGEST) val; |
2445 | tsv->name = varname; | |
2446 | ||
2447 | set_trace_state_variable_value (num, (LONGEST) val); | |
2448 | ||
2449 | write_ok (own_buf); | |
2450 | } | |
2451 | ||
d248b706 KY |
2452 | static void |
2453 | cmd_qtenable_disable (char *own_buf, int enable) | |
2454 | { | |
2455 | char *packet = own_buf; | |
2456 | ULONGEST num, addr; | |
2457 | struct tracepoint *tp; | |
2458 | ||
2459 | packet += strlen (enable ? "QTEnable:" : "QTDisable:"); | |
2460 | packet = unpack_varlen_hex (packet, &num); | |
2461 | ++packet; /* skip a colon */ | |
2462 | packet = unpack_varlen_hex (packet, &addr); | |
2463 | ||
2464 | tp = find_tracepoint (num, addr); | |
2465 | ||
2466 | if (tp) | |
2467 | { | |
2468 | if ((enable && tp->enabled) || (!enable && !tp->enabled)) | |
2469 | { | |
2470 | trace_debug ("Tracepoint %d at 0x%s is already %s", | |
2471 | (int) num, paddress (addr), | |
2472 | enable ? "enabled" : "disabled"); | |
2473 | write_ok (own_buf); | |
2474 | return; | |
2475 | } | |
2476 | ||
2477 | trace_debug ("%s tracepoint %d at 0x%s", | |
2478 | enable ? "Enabling" : "Disabling", | |
2479 | (int) num, paddress (addr)); | |
2480 | ||
2481 | tp->enabled = enable; | |
2482 | ||
2483 | if (tp->type == fast_tracepoint || tp->type == static_tracepoint) | |
2484 | { | |
2485 | int ret; | |
2486 | int offset = offsetof (struct tracepoint, enabled); | |
2487 | CORE_ADDR obj_addr = tp->obj_addr_on_target + offset; | |
2488 | ||
2489 | ret = prepare_to_access_memory (); | |
2490 | if (ret) | |
2491 | { | |
2492 | trace_debug ("Failed to temporarily stop inferior threads"); | |
2493 | write_enn (own_buf); | |
2494 | return; | |
2495 | } | |
2496 | ||
2497 | ret = write_inferior_integer (obj_addr, enable); | |
2498 | done_accessing_memory (); | |
2499 | ||
2500 | if (ret) | |
2501 | { | |
2502 | trace_debug ("Cannot write enabled flag into " | |
2503 | "inferior process memory"); | |
2504 | write_enn (own_buf); | |
2505 | return; | |
2506 | } | |
2507 | } | |
2508 | ||
2509 | write_ok (own_buf); | |
2510 | } | |
2511 | else | |
2512 | { | |
2513 | trace_debug ("Tracepoint %d at 0x%s not found", | |
2514 | (int) num, paddress (addr)); | |
2515 | write_enn (own_buf); | |
2516 | } | |
2517 | } | |
2518 | ||
219f2f23 PA |
2519 | static void |
2520 | cmd_qtv (char *own_buf) | |
2521 | { | |
2522 | ULONGEST num; | |
2523 | LONGEST val; | |
2524 | int err; | |
2525 | char *packet = own_buf; | |
2526 | ||
2527 | packet += strlen ("qTV:"); | |
f8f67713 | 2528 | unpack_varlen_hex (packet, &num); |
219f2f23 PA |
2529 | |
2530 | if (current_traceframe >= 0) | |
2531 | { | |
2532 | err = traceframe_read_tsv ((int) num, &val); | |
2533 | if (err) | |
2534 | { | |
2535 | strcpy (own_buf, "U"); | |
2536 | return; | |
2537 | } | |
2538 | } | |
2539 | /* Only make tsv's be undefined before the first trace run. After a | |
2540 | trace run is over, the user might want to see the last value of | |
2541 | the tsv, and it might not be available in a traceframe. */ | |
2542 | else if (!tracing && strcmp (tracing_stop_reason, "tnotrun") == 0) | |
2543 | { | |
2544 | strcpy (own_buf, "U"); | |
2545 | return; | |
2546 | } | |
2547 | else | |
2548 | val = get_trace_state_variable_value (num); | |
2549 | ||
2550 | sprintf (own_buf, "V%s", phex_nz (val, 0)); | |
2551 | } | |
2552 | ||
2553 | /* Clear out the list of readonly regions. */ | |
2554 | ||
2555 | static void | |
2556 | clear_readonly_regions (void) | |
2557 | { | |
2558 | struct readonly_region *roreg; | |
2559 | ||
2560 | while (readonly_regions) | |
2561 | { | |
2562 | roreg = readonly_regions; | |
2563 | readonly_regions = readonly_regions->next; | |
2564 | free (roreg); | |
2565 | } | |
2566 | } | |
2567 | ||
2568 | /* Parse the collection of address ranges whose contents GDB believes | |
2569 | to be unchanging and so can be read directly from target memory | |
2570 | even while looking at a traceframe. */ | |
2571 | ||
2572 | static void | |
2573 | cmd_qtro (char *own_buf) | |
2574 | { | |
2575 | ULONGEST start, end; | |
2576 | struct readonly_region *roreg; | |
2577 | char *packet = own_buf; | |
2578 | ||
2579 | trace_debug ("Want to mark readonly regions"); | |
2580 | ||
2581 | clear_readonly_regions (); | |
2582 | ||
2583 | packet += strlen ("QTro"); | |
2584 | ||
2585 | while (*packet == ':') | |
2586 | { | |
2587 | ++packet; /* skip a colon */ | |
2588 | packet = unpack_varlen_hex (packet, &start); | |
2589 | ++packet; /* skip a comma */ | |
2590 | packet = unpack_varlen_hex (packet, &end); | |
2591 | roreg = xmalloc (sizeof (struct readonly_region)); | |
2592 | roreg->start = start; | |
2593 | roreg->end = end; | |
2594 | roreg->next = readonly_regions; | |
2595 | readonly_regions = roreg; | |
2596 | trace_debug ("Added readonly region from 0x%s to 0x%s", | |
2597 | paddress (roreg->start), paddress (roreg->end)); | |
2598 | } | |
2599 | ||
2600 | write_ok (own_buf); | |
2601 | } | |
2602 | ||
2603 | /* Test to see if the given range is in our list of readonly ranges. | |
2604 | We only test for being entirely within a range, GDB is not going to | |
2605 | send a single memory packet that spans multiple regions. */ | |
2606 | ||
2607 | int | |
2608 | in_readonly_region (CORE_ADDR addr, ULONGEST length) | |
2609 | { | |
2610 | struct readonly_region *roreg; | |
2611 | ||
2612 | for (roreg = readonly_regions; roreg; roreg = roreg->next) | |
2613 | if (roreg->start <= addr && (addr + length - 1) <= roreg->end) | |
2614 | return 1; | |
2615 | ||
2616 | return 0; | |
2617 | } | |
2618 | ||
fa593d66 PA |
2619 | /* The maximum size of a jump pad entry. */ |
2620 | static const int max_jump_pad_size = 0x100; | |
2621 | ||
2622 | static CORE_ADDR gdb_jump_pad_head; | |
2623 | ||
2624 | /* Return the address of the next free jump space. */ | |
2625 | ||
2626 | static CORE_ADDR | |
2627 | get_jump_space_head (void) | |
2628 | { | |
2629 | if (gdb_jump_pad_head == 0) | |
2630 | { | |
2631 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer, | |
2632 | &gdb_jump_pad_head)) | |
2633 | fatal ("error extracting jump_pad_buffer"); | |
2634 | } | |
2635 | ||
2636 | return gdb_jump_pad_head; | |
2637 | } | |
2638 | ||
2639 | /* Reserve USED bytes from the jump space. */ | |
2640 | ||
2641 | static void | |
2642 | claim_jump_space (ULONGEST used) | |
2643 | { | |
2644 | trace_debug ("claim_jump_space reserves %s bytes at %s", | |
2645 | pulongest (used), paddress (gdb_jump_pad_head)); | |
2646 | gdb_jump_pad_head += used; | |
2647 | } | |
2648 | ||
2649 | /* Sort tracepoints by PC, using a bubble sort. */ | |
2650 | ||
2651 | static void | |
2652 | sort_tracepoints (void) | |
2653 | { | |
2654 | struct tracepoint *lst, *tmp, *prev = NULL; | |
2655 | int i, j, n = 0; | |
2656 | ||
2657 | if (tracepoints == NULL) | |
2658 | return; | |
2659 | ||
2660 | /* Count nodes. */ | |
2661 | for (tmp = tracepoints; tmp->next; tmp = tmp->next) | |
2662 | n++; | |
2663 | ||
2664 | for (i = 0; i < n - 1; i++) | |
2665 | for (j = 0, lst = tracepoints; | |
2666 | lst && lst->next && (j <= n - 1 - i); | |
2667 | j++) | |
2668 | { | |
2669 | /* If we're at beginning, the start node is the prev | |
2670 | node. */ | |
2671 | if (j == 0) | |
2672 | prev = lst; | |
2673 | ||
2674 | /* Compare neighbors. */ | |
2675 | if (lst->next->address < lst->address) | |
2676 | { | |
2677 | struct tracepoint *p; | |
2678 | ||
2679 | /* Swap'em. */ | |
2680 | tmp = (lst->next ? lst->next->next : NULL); | |
2681 | ||
2682 | if (j == 0 && prev == tracepoints) | |
2683 | tracepoints = lst->next; | |
2684 | ||
2685 | p = lst->next; | |
2686 | prev->next = lst->next; | |
2687 | lst->next->next = lst; | |
2688 | lst->next = tmp; | |
2689 | prev = p; | |
2690 | } | |
2691 | else | |
2692 | { | |
2693 | lst = lst->next; | |
2694 | /* Keep track of the previous node. We need it if we need | |
2695 | to swap nodes. */ | |
2696 | if (j != 0) | |
2697 | prev = prev->next; | |
2698 | } | |
2699 | } | |
2700 | } | |
2701 | ||
0fb4aa4b PA |
2702 | /* Ask the IPA to probe the marker at ADDRESS. Returns -1 if running |
2703 | the command fails, or 0 otherwise. If the command ran | |
2704 | successfully, but probing the marker failed, ERROUT will be filled | |
2705 | with the error to reply to GDB, and -1 is also returned. This | |
2706 | allows directly passing IPA errors to GDB. */ | |
2707 | ||
2708 | static int | |
2709 | probe_marker_at (CORE_ADDR address, char *errout) | |
2710 | { | |
2711 | char cmd[CMD_BUF_SIZE]; | |
2712 | int err; | |
2713 | ||
2714 | sprintf (cmd, "probe_marker_at:%s", paddress (address)); | |
2715 | err = run_inferior_command (cmd); | |
2716 | ||
2717 | if (err == 0) | |
2718 | { | |
2719 | if (*cmd == 'E') | |
2720 | { | |
2721 | strcpy (errout, cmd); | |
2722 | return -1; | |
2723 | } | |
2724 | } | |
2725 | ||
2726 | return err; | |
2727 | } | |
2728 | ||
fa593d66 PA |
2729 | #define MAX_JUMP_SIZE 20 |
2730 | ||
219f2f23 PA |
2731 | static void |
2732 | cmd_qtstart (char *packet) | |
2733 | { | |
0fb4aa4b | 2734 | struct tracepoint *tpoint, *prev_ftpoint, *prev_stpoint; |
fa593d66 PA |
2735 | int slow_tracepoint_count, fast_count; |
2736 | CORE_ADDR jump_entry; | |
2737 | ||
2738 | /* The jump to the jump pad of the last fast tracepoint | |
2739 | installed. */ | |
2740 | unsigned char fjump[MAX_JUMP_SIZE]; | |
2741 | ULONGEST fjump_size; | |
219f2f23 PA |
2742 | |
2743 | trace_debug ("Starting the trace"); | |
2744 | ||
fa593d66 | 2745 | slow_tracepoint_count = fast_count = 0; |
219f2f23 | 2746 | |
fa593d66 PA |
2747 | /* Sort tracepoints by ascending address. This makes installing |
2748 | fast tracepoints at the same address easier to handle. */ | |
2749 | sort_tracepoints (); | |
219f2f23 | 2750 | |
7984d532 | 2751 | /* Pause all threads temporarily while we patch tracepoints. */ |
fa593d66 PA |
2752 | pause_all (0); |
2753 | ||
2754 | /* Get threads out of jump pads. Safe to do here, since this is a | |
2755 | top level command. And, required to do here, since we're | |
2756 | deleting/rewriting jump pads. */ | |
2757 | ||
2758 | stabilize_threads (); | |
2759 | ||
2760 | /* Freeze threads. */ | |
7984d532 PA |
2761 | pause_all (1); |
2762 | ||
fa593d66 PA |
2763 | /* Sync the fast tracepoints list in the inferior ftlib. */ |
2764 | if (in_process_agent_loaded ()) | |
2765 | { | |
2766 | download_tracepoints (); | |
2767 | download_trace_state_variables (); | |
2768 | } | |
2769 | ||
2770 | /* No previous fast tpoint yet. */ | |
2771 | prev_ftpoint = NULL; | |
2772 | ||
0fb4aa4b PA |
2773 | /* No previous static tpoint yet. */ |
2774 | prev_stpoint = NULL; | |
2775 | ||
fa593d66 PA |
2776 | *packet = '\0'; |
2777 | ||
219f2f23 PA |
2778 | /* Install tracepoints. */ |
2779 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
2780 | { | |
2781 | /* Ensure all the hit counts start at zero. */ | |
2782 | tpoint->hit_count = 0; | |
2783 | ||
fa593d66 PA |
2784 | if (tpoint->type == trap_tracepoint) |
2785 | { | |
2786 | ++slow_tracepoint_count; | |
2787 | ||
2788 | /* Tracepoints are installed as memory breakpoints. Just go | |
2789 | ahead and install the trap. The breakpoints module | |
2790 | handles duplicated breakpoints, and the memory read | |
2791 | routine handles un-patching traps from memory reads. */ | |
2792 | tpoint->handle = set_breakpoint_at (tpoint->address, | |
2793 | tracepoint_handler); | |
2794 | } | |
2795 | else if (tpoint->type == fast_tracepoint) | |
2796 | { | |
2797 | ++fast_count; | |
2798 | ||
2799 | if (maybe_write_ipa_not_loaded (packet)) | |
2800 | { | |
2801 | trace_debug ("Requested a fast tracepoint, but fast " | |
2802 | "tracepoints aren't supported."); | |
2803 | break; | |
2804 | } | |
2805 | ||
2806 | if (prev_ftpoint != NULL && prev_ftpoint->address == tpoint->address) | |
2807 | { | |
2808 | tpoint->handle = set_fast_tracepoint_jump (tpoint->address, | |
2809 | fjump, | |
2810 | fjump_size); | |
2811 | tpoint->jump_pad = prev_ftpoint->jump_pad; | |
2812 | tpoint->jump_pad_end = prev_ftpoint->jump_pad_end; | |
2813 | tpoint->adjusted_insn_addr = prev_ftpoint->adjusted_insn_addr; | |
2814 | tpoint->adjusted_insn_addr_end | |
2815 | = prev_ftpoint->adjusted_insn_addr_end; | |
2816 | } | |
2817 | else | |
2818 | { | |
2819 | CORE_ADDR jentry; | |
2820 | int err = 0; | |
2821 | ||
2822 | prev_ftpoint = NULL; | |
2823 | ||
2824 | jentry = jump_entry = get_jump_space_head (); | |
2825 | ||
2826 | /* Install the jump pad. */ | |
2827 | err = install_fast_tracepoint_jump_pad | |
2828 | (tpoint->obj_addr_on_target, | |
2829 | tpoint->address, | |
2830 | ipa_sym_addrs.addr_gdb_collect, | |
2831 | ipa_sym_addrs.addr_collecting, | |
2832 | tpoint->orig_size, | |
2833 | &jentry, | |
2834 | fjump, &fjump_size, | |
2835 | &tpoint->adjusted_insn_addr, | |
2836 | &tpoint->adjusted_insn_addr_end); | |
2837 | ||
2838 | /* Wire it in. */ | |
2839 | if (!err) | |
2840 | tpoint->handle = set_fast_tracepoint_jump (tpoint->address, | |
2841 | fjump, fjump_size); | |
2842 | ||
2843 | if (tpoint->handle != NULL) | |
2844 | { | |
2845 | tpoint->jump_pad = jump_entry; | |
2846 | tpoint->jump_pad_end = jentry; | |
219f2f23 | 2847 | |
fa593d66 PA |
2848 | /* Pad to 8-byte alignment. */ |
2849 | jentry = ((jentry + 7) & ~0x7); | |
2850 | claim_jump_space (jentry - jump_entry); | |
219f2f23 | 2851 | |
fa593d66 PA |
2852 | /* So that we can handle multiple fast tracepoints |
2853 | at the same address easily. */ | |
2854 | prev_ftpoint = tpoint; | |
2855 | } | |
2856 | } | |
2857 | } | |
0fb4aa4b PA |
2858 | else if (tpoint->type == static_tracepoint) |
2859 | { | |
2860 | if (maybe_write_ipa_ust_not_loaded (packet)) | |
2861 | { | |
2862 | trace_debug ("Requested a static tracepoint, but static " | |
2863 | "tracepoints are not supported."); | |
2864 | break; | |
2865 | } | |
2866 | ||
2867 | /* Can only probe a given marker once. */ | |
2868 | if (prev_stpoint != NULL && prev_stpoint->address == tpoint->address) | |
2869 | { | |
2870 | tpoint->handle = (void *) -1; | |
2871 | } | |
2872 | else | |
2873 | { | |
2874 | if (probe_marker_at (tpoint->address, packet) == 0) | |
2875 | { | |
2876 | tpoint->handle = (void *) -1; | |
2877 | ||
2878 | /* So that we can handle multiple static tracepoints | |
2879 | at the same address easily. */ | |
2880 | prev_stpoint = tpoint; | |
2881 | } | |
2882 | } | |
2883 | } | |
fa593d66 PA |
2884 | |
2885 | /* Any failure in the inner loop is sufficient cause to give | |
2886 | up. */ | |
219f2f23 PA |
2887 | if (tpoint->handle == NULL) |
2888 | break; | |
2889 | } | |
2890 | ||
2891 | /* Any error in tracepoint insertion is unacceptable; better to | |
2892 | address the problem now, than end up with a useless or misleading | |
2893 | trace run. */ | |
2894 | if (tpoint != NULL) | |
2895 | { | |
2896 | clear_installed_tracepoints (); | |
2897 | if (*packet == '\0') | |
2898 | write_enn (packet); | |
7984d532 | 2899 | unpause_all (1); |
219f2f23 PA |
2900 | return; |
2901 | } | |
2902 | ||
2903 | stopping_tracepoint = NULL; | |
2904 | trace_buffer_is_full = 0; | |
2905 | expr_eval_result = expr_eval_no_error; | |
2906 | error_tracepoint = NULL; | |
2907 | ||
2908 | /* Tracing is now active, hits will now start being logged. */ | |
2909 | tracing = 1; | |
2910 | ||
fa593d66 PA |
2911 | if (in_process_agent_loaded ()) |
2912 | { | |
2913 | if (write_inferior_integer (ipa_sym_addrs.addr_tracing, 1)) | |
2914 | fatal ("Error setting tracing variable in lib"); | |
2915 | ||
2916 | if (write_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, | |
2917 | 0)) | |
2918 | fatal ("Error clearing stopping_tracepoint variable in lib"); | |
2919 | ||
2920 | if (write_inferior_integer (ipa_sym_addrs.addr_trace_buffer_is_full, 0)) | |
2921 | fatal ("Error clearing trace_buffer_is_full variable in lib"); | |
2922 | ||
2923 | stop_tracing_bkpt = set_breakpoint_at (ipa_sym_addrs.addr_stop_tracing, | |
2924 | stop_tracing_handler); | |
2925 | if (stop_tracing_bkpt == NULL) | |
2926 | error ("Error setting stop_tracing breakpoint"); | |
2927 | ||
2928 | flush_trace_buffer_bkpt | |
2929 | = set_breakpoint_at (ipa_sym_addrs.addr_flush_trace_buffer, | |
2930 | flush_trace_buffer_handler); | |
2931 | if (flush_trace_buffer_bkpt == NULL) | |
2932 | error ("Error setting flush_trace_buffer breakpoint"); | |
2933 | } | |
2934 | ||
7984d532 PA |
2935 | unpause_all (1); |
2936 | ||
219f2f23 PA |
2937 | write_ok (packet); |
2938 | } | |
2939 | ||
2940 | /* End a tracing run, filling in a stop reason to report back to GDB, | |
2941 | and removing the tracepoints from the code. */ | |
2942 | ||
8336d594 | 2943 | void |
219f2f23 PA |
2944 | stop_tracing (void) |
2945 | { | |
2946 | if (!tracing) | |
2947 | { | |
2948 | trace_debug ("Tracing is already off, ignoring"); | |
2949 | return; | |
2950 | } | |
2951 | ||
2952 | trace_debug ("Stopping the trace"); | |
2953 | ||
fa593d66 PA |
2954 | /* Pause all threads before removing fast jumps from memory, |
2955 | breakpoints, and touching IPA state variables (inferior memory). | |
2956 | Some thread may hit the internal tracing breakpoints, or be | |
2957 | collecting this moment, but that's ok, we don't release the | |
2958 | tpoint object's memory or the jump pads here (we only do that | |
2959 | when we're sure we can move all threads out of the jump pads). | |
2960 | We can't now, since we may be getting here due to the inferior | |
2961 | agent calling us. */ | |
7984d532 PA |
2962 | pause_all (1); |
2963 | /* Since we're removing breakpoints, cancel breakpoint hits, | |
2964 | possibly related to the breakpoints we're about to delete. */ | |
2965 | cancel_breakpoints (); | |
2966 | ||
219f2f23 PA |
2967 | /* Stop logging. Tracepoints can still be hit, but they will not be |
2968 | recorded. */ | |
2969 | tracing = 0; | |
fa593d66 PA |
2970 | if (in_process_agent_loaded ()) |
2971 | { | |
2972 | if (write_inferior_integer (ipa_sym_addrs.addr_tracing, 0)) | |
2973 | fatal ("Error clearing tracing variable in lib"); | |
2974 | } | |
219f2f23 PA |
2975 | |
2976 | tracing_stop_reason = "t???"; | |
2977 | tracing_stop_tpnum = 0; | |
2978 | if (stopping_tracepoint) | |
2979 | { | |
2980 | trace_debug ("Stopping the trace because " | |
2981 | "tracepoint %d was hit %ld times", | |
2982 | stopping_tracepoint->number, | |
2983 | stopping_tracepoint->pass_count); | |
2984 | tracing_stop_reason = "tpasscount"; | |
2985 | tracing_stop_tpnum = stopping_tracepoint->number; | |
2986 | } | |
2987 | else if (trace_buffer_is_full) | |
2988 | { | |
2989 | trace_debug ("Stopping the trace because the trace buffer is full"); | |
2990 | tracing_stop_reason = "tfull"; | |
2991 | } | |
2992 | else if (expr_eval_result != expr_eval_no_error) | |
2993 | { | |
2994 | trace_debug ("Stopping the trace because of an expression eval error"); | |
2995 | tracing_stop_reason = eval_result_names[expr_eval_result]; | |
2996 | tracing_stop_tpnum = error_tracepoint->number; | |
2997 | } | |
fa593d66 | 2998 | #ifndef IN_PROCESS_AGENT |
8336d594 PA |
2999 | else if (!gdb_connected ()) |
3000 | { | |
3001 | trace_debug ("Stopping the trace because GDB disconnected"); | |
3002 | tracing_stop_reason = "tdisconnected"; | |
3003 | } | |
fa593d66 | 3004 | #endif |
219f2f23 PA |
3005 | else |
3006 | { | |
3007 | trace_debug ("Stopping the trace because of a tstop command"); | |
3008 | tracing_stop_reason = "tstop"; | |
3009 | } | |
3010 | ||
3011 | stopping_tracepoint = NULL; | |
3012 | error_tracepoint = NULL; | |
3013 | ||
3014 | /* Clear out the tracepoints. */ | |
3015 | clear_installed_tracepoints (); | |
7984d532 | 3016 | |
fa593d66 PA |
3017 | if (in_process_agent_loaded ()) |
3018 | { | |
3019 | /* Pull in fast tracepoint trace frames from the inferior lib | |
3020 | buffer into our buffer, even if our buffer is already full, | |
3021 | because we want to present the full number of created frames | |
3022 | in addition to what fit in the trace buffer. */ | |
3023 | upload_fast_traceframes (); | |
3024 | } | |
3025 | ||
3026 | if (stop_tracing_bkpt != NULL) | |
3027 | { | |
3028 | delete_breakpoint (stop_tracing_bkpt); | |
3029 | stop_tracing_bkpt = NULL; | |
3030 | } | |
3031 | ||
3032 | if (flush_trace_buffer_bkpt != NULL) | |
3033 | { | |
3034 | delete_breakpoint (flush_trace_buffer_bkpt); | |
3035 | flush_trace_buffer_bkpt = NULL; | |
3036 | } | |
3037 | ||
7984d532 | 3038 | unpause_all (1); |
219f2f23 PA |
3039 | } |
3040 | ||
fa593d66 PA |
3041 | static int |
3042 | stop_tracing_handler (CORE_ADDR addr) | |
3043 | { | |
3044 | trace_debug ("lib hit stop_tracing"); | |
3045 | ||
3046 | /* Don't actually handle it here. When we stop tracing we remove | |
3047 | breakpoints from the inferior, and that is not allowed in a | |
3048 | breakpoint handler (as the caller is walking the breakpoint | |
3049 | list). */ | |
3050 | return 0; | |
3051 | } | |
3052 | ||
3053 | static int | |
3054 | flush_trace_buffer_handler (CORE_ADDR addr) | |
3055 | { | |
3056 | trace_debug ("lib hit flush_trace_buffer"); | |
3057 | return 0; | |
3058 | } | |
3059 | ||
219f2f23 PA |
3060 | static void |
3061 | cmd_qtstop (char *packet) | |
3062 | { | |
3063 | stop_tracing (); | |
3064 | write_ok (packet); | |
3065 | } | |
3066 | ||
8336d594 PA |
3067 | static void |
3068 | cmd_qtdisconnected (char *own_buf) | |
3069 | { | |
3070 | ULONGEST setting; | |
3071 | char *packet = own_buf; | |
3072 | ||
3073 | packet += strlen ("QTDisconnected:"); | |
3074 | ||
3075 | unpack_varlen_hex (packet, &setting); | |
3076 | ||
3077 | write_ok (own_buf); | |
3078 | ||
3079 | disconnected_tracing = setting; | |
3080 | } | |
3081 | ||
219f2f23 PA |
3082 | static void |
3083 | cmd_qtframe (char *own_buf) | |
3084 | { | |
3085 | ULONGEST frame, pc, lo, hi, num; | |
3086 | int tfnum, tpnum; | |
3087 | struct traceframe *tframe; | |
3088 | char *packet = own_buf; | |
3089 | ||
3090 | packet += strlen ("QTFrame:"); | |
3091 | ||
3092 | if (strncmp (packet, "pc:", strlen ("pc:")) == 0) | |
3093 | { | |
3094 | packet += strlen ("pc:"); | |
f8f67713 | 3095 | unpack_varlen_hex (packet, &pc); |
219f2f23 PA |
3096 | trace_debug ("Want to find next traceframe at pc=0x%s", paddress (pc)); |
3097 | tframe = find_next_traceframe_in_range (pc, pc, 1, &tfnum); | |
3098 | } | |
3099 | else if (strncmp (packet, "range:", strlen ("range:")) == 0) | |
3100 | { | |
3101 | packet += strlen ("range:"); | |
3102 | packet = unpack_varlen_hex (packet, &lo); | |
3103 | ++packet; | |
f8f67713 | 3104 | unpack_varlen_hex (packet, &hi); |
219f2f23 PA |
3105 | trace_debug ("Want to find next traceframe in the range 0x%s to 0x%s", |
3106 | paddress (lo), paddress (hi)); | |
3107 | tframe = find_next_traceframe_in_range (lo, hi, 1, &tfnum); | |
3108 | } | |
3109 | else if (strncmp (packet, "outside:", strlen ("outside:")) == 0) | |
3110 | { | |
3111 | packet += strlen ("outside:"); | |
3112 | packet = unpack_varlen_hex (packet, &lo); | |
3113 | ++packet; | |
f8f67713 | 3114 | unpack_varlen_hex (packet, &hi); |
219f2f23 PA |
3115 | trace_debug ("Want to find next traceframe " |
3116 | "outside the range 0x%s to 0x%s", | |
3117 | paddress (lo), paddress (hi)); | |
3118 | tframe = find_next_traceframe_in_range (lo, hi, 0, &tfnum); | |
3119 | } | |
3120 | else if (strncmp (packet, "tdp:", strlen ("tdp:")) == 0) | |
3121 | { | |
3122 | packet += strlen ("tdp:"); | |
f8f67713 | 3123 | unpack_varlen_hex (packet, &num); |
219f2f23 PA |
3124 | tpnum = (int) num; |
3125 | trace_debug ("Want to find next traceframe for tracepoint %d", tpnum); | |
3126 | tframe = find_next_traceframe_by_tracepoint (tpnum, &tfnum); | |
3127 | } | |
3128 | else | |
3129 | { | |
3130 | unpack_varlen_hex (packet, &frame); | |
3131 | tfnum = (int) frame; | |
3132 | if (tfnum == -1) | |
3133 | { | |
3134 | trace_debug ("Want to stop looking at traceframes"); | |
3135 | current_traceframe = -1; | |
3136 | write_ok (own_buf); | |
3137 | return; | |
3138 | } | |
3139 | trace_debug ("Want to look at traceframe %d", tfnum); | |
3140 | tframe = find_traceframe (tfnum); | |
3141 | } | |
3142 | ||
3143 | if (tframe) | |
3144 | { | |
3145 | current_traceframe = tfnum; | |
3146 | sprintf (own_buf, "F%xT%x", tfnum, tframe->tpnum); | |
3147 | } | |
3148 | else | |
3149 | sprintf (own_buf, "F-1"); | |
3150 | } | |
3151 | ||
3152 | static void | |
3153 | cmd_qtstatus (char *packet) | |
3154 | { | |
3155 | char *stop_reason_rsp = NULL; | |
3156 | ||
3157 | trace_debug ("Returning trace status as %d, stop reason %s", | |
3158 | tracing, tracing_stop_reason); | |
3159 | ||
fa593d66 PA |
3160 | if (in_process_agent_loaded ()) |
3161 | { | |
3162 | pause_all (1); | |
3163 | ||
3164 | upload_fast_traceframes (); | |
3165 | ||
3166 | unpause_all (1); | |
3167 | } | |
3168 | ||
219f2f23 PA |
3169 | stop_reason_rsp = (char *) tracing_stop_reason; |
3170 | ||
3171 | /* The user visible error string in terror needs to be hex encoded. | |
3172 | We leave it as plain string in `tracepoint_stop_reason' to ease | |
3173 | debugging. */ | |
3174 | if (strncmp (stop_reason_rsp, "terror:", strlen ("terror:")) == 0) | |
3175 | { | |
3176 | const char *result_name; | |
3177 | int hexstr_len; | |
3178 | char *p; | |
3179 | ||
3180 | result_name = stop_reason_rsp + strlen ("terror:"); | |
3181 | hexstr_len = strlen (result_name) * 2; | |
3182 | p = stop_reason_rsp = alloca (strlen ("terror:") + hexstr_len + 1); | |
3183 | strcpy (p, "terror:"); | |
3184 | p += strlen (p); | |
3185 | convert_int_to_ascii ((gdb_byte *) result_name, p, strlen (result_name)); | |
3186 | } | |
3187 | ||
8336d594 PA |
3188 | sprintf (packet, |
3189 | "T%d;" | |
3190 | "%s:%x;" | |
3191 | "tframes:%x;tcreated:%x;" | |
3192 | "tfree:%x;tsize:%s;" | |
3193 | "circular:%d;" | |
3194 | "disconn:%d", | |
623ccd72 | 3195 | tracing ? 1 : 0, |
219f2f23 PA |
3196 | stop_reason_rsp, tracing_stop_tpnum, |
3197 | traceframe_count, traceframes_created, | |
8336d594 PA |
3198 | free_space (), phex_nz (trace_buffer_hi - trace_buffer_lo, 0), |
3199 | circular_trace_buffer, | |
3200 | disconnected_tracing); | |
219f2f23 PA |
3201 | } |
3202 | ||
3203 | /* State variables to help return all the tracepoint bits. */ | |
3204 | static struct tracepoint *cur_tpoint; | |
3205 | static int cur_action; | |
3206 | static int cur_step_action; | |
3207 | static struct source_string *cur_source_string; | |
3208 | static struct trace_state_variable *cur_tsv; | |
3209 | ||
3210 | /* Compose a response that is an imitation of the syntax by which the | |
3211 | tracepoint was originally downloaded. */ | |
3212 | ||
3213 | static void | |
3214 | response_tracepoint (char *packet, struct tracepoint *tpoint) | |
3215 | { | |
3216 | char *buf; | |
3217 | ||
3218 | sprintf (packet, "T%x:%s:%c:%lx:%lx", tpoint->number, | |
3219 | paddress (tpoint->address), | |
3220 | (tpoint->enabled ? 'E' : 'D'), tpoint->step_count, | |
3221 | tpoint->pass_count); | |
fa593d66 PA |
3222 | if (tpoint->type == fast_tracepoint) |
3223 | sprintf (packet + strlen (packet), ":F%x", tpoint->orig_size); | |
0fb4aa4b PA |
3224 | else if (tpoint->type == static_tracepoint) |
3225 | sprintf (packet + strlen (packet), ":S"); | |
219f2f23 PA |
3226 | |
3227 | if (tpoint->cond) | |
3228 | { | |
3229 | buf = unparse_agent_expr (tpoint->cond); | |
3230 | sprintf (packet + strlen (packet), ":X%x,%s", | |
3231 | tpoint->cond->length, buf); | |
3232 | free (buf); | |
3233 | } | |
3234 | } | |
3235 | ||
3236 | /* Compose a response that is an imitation of the syntax by which the | |
3237 | tracepoint action was originally downloaded (with the difference | |
3238 | that due to the way we store the actions, this will output a packet | |
3239 | per action, while GDB could have combined more than one action | |
3240 | per-packet. */ | |
3241 | ||
3242 | static void | |
3243 | response_action (char *packet, struct tracepoint *tpoint, | |
3244 | char *taction, int step) | |
3245 | { | |
3246 | sprintf (packet, "%c%x:%s:%s", | |
3247 | (step ? 'S' : 'A'), tpoint->number, paddress (tpoint->address), | |
3248 | taction); | |
3249 | } | |
3250 | ||
3251 | /* Compose a response that is an imitation of the syntax by which the | |
3252 | tracepoint source piece was originally downloaded. */ | |
3253 | ||
3254 | static void | |
3255 | response_source (char *packet, | |
3256 | struct tracepoint *tpoint, struct source_string *src) | |
3257 | { | |
3258 | char *buf; | |
3259 | int len; | |
3260 | ||
3261 | len = strlen (src->str); | |
3262 | buf = alloca (len * 2 + 1); | |
3263 | convert_int_to_ascii ((gdb_byte *) src->str, buf, len); | |
3264 | ||
3265 | sprintf (packet, "Z%x:%s:%s:%x:%x:%s", | |
3266 | tpoint->number, paddress (tpoint->address), | |
3267 | src->type, 0, len, buf); | |
3268 | } | |
3269 | ||
3270 | /* Return the first piece of tracepoint definition, and initialize the | |
3271 | state machine that will iterate through all the tracepoint | |
3272 | bits. */ | |
3273 | ||
3274 | static void | |
3275 | cmd_qtfp (char *packet) | |
3276 | { | |
3277 | trace_debug ("Returning first tracepoint definition piece"); | |
3278 | ||
3279 | cur_tpoint = tracepoints; | |
3280 | cur_action = cur_step_action = -1; | |
3281 | cur_source_string = NULL; | |
3282 | ||
3283 | if (cur_tpoint) | |
3284 | response_tracepoint (packet, cur_tpoint); | |
3285 | else | |
3286 | strcpy (packet, "l"); | |
3287 | } | |
3288 | ||
3289 | /* Return additional pieces of tracepoint definition. Each action and | |
3290 | stepping action must go into its own packet, because of packet size | |
3291 | limits, and so we use state variables to deliver one piece at a | |
3292 | time. */ | |
3293 | ||
3294 | static void | |
3295 | cmd_qtsp (char *packet) | |
3296 | { | |
3297 | trace_debug ("Returning subsequent tracepoint definition piece"); | |
3298 | ||
3299 | if (!cur_tpoint) | |
3300 | { | |
3301 | /* This case would normally never occur, but be prepared for | |
3302 | GDB misbehavior. */ | |
3303 | strcpy (packet, "l"); | |
3304 | } | |
3305 | else if (cur_action < cur_tpoint->numactions - 1) | |
3306 | { | |
3307 | ++cur_action; | |
3308 | response_action (packet, cur_tpoint, | |
3309 | cur_tpoint->actions_str[cur_action], 0); | |
3310 | } | |
3311 | else if (cur_step_action < cur_tpoint->num_step_actions - 1) | |
3312 | { | |
3313 | ++cur_step_action; | |
3314 | response_action (packet, cur_tpoint, | |
3315 | cur_tpoint->step_actions_str[cur_step_action], 1); | |
3316 | } | |
3317 | else if ((cur_source_string | |
3318 | ? cur_source_string->next | |
3319 | : cur_tpoint->source_strings)) | |
3320 | { | |
3321 | if (cur_source_string) | |
3322 | cur_source_string = cur_source_string->next; | |
3323 | else | |
3324 | cur_source_string = cur_tpoint->source_strings; | |
3325 | response_source (packet, cur_tpoint, cur_source_string); | |
3326 | } | |
3327 | else | |
3328 | { | |
3329 | cur_tpoint = cur_tpoint->next; | |
3330 | cur_action = cur_step_action = -1; | |
3331 | cur_source_string = NULL; | |
3332 | if (cur_tpoint) | |
3333 | response_tracepoint (packet, cur_tpoint); | |
3334 | else | |
3335 | strcpy (packet, "l"); | |
3336 | } | |
3337 | } | |
3338 | ||
3339 | /* Compose a response that is an imitation of the syntax by which the | |
3340 | trace state variable was originally downloaded. */ | |
3341 | ||
3342 | static void | |
3343 | response_tsv (char *packet, struct trace_state_variable *tsv) | |
3344 | { | |
3345 | char *buf = (char *) ""; | |
3346 | int namelen; | |
3347 | ||
3348 | if (tsv->name) | |
3349 | { | |
3350 | namelen = strlen (tsv->name); | |
3351 | buf = alloca (namelen * 2 + 1); | |
3352 | convert_int_to_ascii ((gdb_byte *) tsv->name, buf, namelen); | |
3353 | } | |
3354 | ||
3355 | sprintf (packet, "%x:%s:%x:%s", tsv->number, phex_nz (tsv->initial_value, 0), | |
3356 | tsv->getter ? 1 : 0, buf); | |
3357 | } | |
3358 | ||
3359 | /* Return the first trace state variable definition, and initialize | |
3360 | the state machine that will iterate through all the tsv bits. */ | |
3361 | ||
3362 | static void | |
3363 | cmd_qtfv (char *packet) | |
3364 | { | |
3365 | trace_debug ("Returning first trace state variable definition"); | |
3366 | ||
3367 | cur_tsv = trace_state_variables; | |
3368 | ||
3369 | if (cur_tsv) | |
3370 | response_tsv (packet, cur_tsv); | |
3371 | else | |
3372 | strcpy (packet, "l"); | |
3373 | } | |
3374 | ||
3375 | /* Return additional trace state variable definitions. */ | |
3376 | ||
3377 | static void | |
3378 | cmd_qtsv (char *packet) | |
3379 | { | |
3380 | trace_debug ("Returning first trace state variable definition"); | |
3381 | ||
3382 | if (!cur_tpoint) | |
3383 | { | |
3384 | /* This case would normally never occur, but be prepared for | |
3385 | GDB misbehavior. */ | |
3386 | strcpy (packet, "l"); | |
3387 | } | |
3388 | else if (cur_tsv) | |
3389 | { | |
3390 | cur_tsv = cur_tsv->next; | |
3391 | if (cur_tsv) | |
3392 | response_tsv (packet, cur_tsv); | |
3393 | else | |
3394 | strcpy (packet, "l"); | |
3395 | } | |
3396 | else | |
3397 | strcpy (packet, "l"); | |
3398 | } | |
3399 | ||
0fb4aa4b PA |
3400 | /* Return the first static tracepoint marker, and initialize the state |
3401 | machine that will iterate through all the static tracepoints | |
3402 | markers. */ | |
3403 | ||
3404 | static void | |
3405 | cmd_qtfstm (char *packet) | |
3406 | { | |
3407 | if (!maybe_write_ipa_ust_not_loaded (packet)) | |
3408 | run_inferior_command (packet); | |
3409 | } | |
3410 | ||
3411 | /* Return additional static tracepoints markers. */ | |
3412 | ||
3413 | static void | |
3414 | cmd_qtsstm (char *packet) | |
3415 | { | |
3416 | if (!maybe_write_ipa_ust_not_loaded (packet)) | |
3417 | run_inferior_command (packet); | |
3418 | } | |
3419 | ||
3420 | /* Return the definition of the static tracepoint at a given address. | |
3421 | Result packet is the same as qTsST's. */ | |
3422 | ||
3423 | static void | |
3424 | cmd_qtstmat (char *packet) | |
3425 | { | |
3426 | if (!maybe_write_ipa_ust_not_loaded (packet)) | |
3427 | run_inferior_command (packet); | |
3428 | } | |
3429 | ||
219f2f23 PA |
3430 | /* Respond to qTBuffer packet with a block of raw data from the trace |
3431 | buffer. GDB may ask for a lot, but we are allowed to reply with | |
3432 | only as much as will fit within packet limits or whatever. */ | |
3433 | ||
3434 | static void | |
3435 | cmd_qtbuffer (char *own_buf) | |
3436 | { | |
3437 | ULONGEST offset, num, tot; | |
3438 | unsigned char *tbp; | |
3439 | char *packet = own_buf; | |
3440 | ||
3441 | packet += strlen ("qTBuffer:"); | |
3442 | ||
3443 | packet = unpack_varlen_hex (packet, &offset); | |
3444 | ++packet; /* skip a comma */ | |
f8f67713 | 3445 | unpack_varlen_hex (packet, &num); |
219f2f23 PA |
3446 | |
3447 | trace_debug ("Want to get trace buffer, %d bytes at offset 0x%s", | |
3448 | (int) num, pulongest (offset)); | |
3449 | ||
3450 | tot = (trace_buffer_hi - trace_buffer_lo) - free_space (); | |
3451 | ||
3452 | /* If we're right at the end, reply specially that we're done. */ | |
3453 | if (offset == tot) | |
3454 | { | |
3455 | strcpy (own_buf, "l"); | |
3456 | return; | |
3457 | } | |
3458 | ||
3459 | /* Object to any other out-of-bounds request. */ | |
3460 | if (offset > tot) | |
3461 | { | |
3462 | write_enn (own_buf); | |
3463 | return; | |
3464 | } | |
3465 | ||
3466 | /* Compute the pointer corresponding to the given offset, accounting | |
3467 | for wraparound. */ | |
3468 | tbp = trace_buffer_start + offset; | |
3469 | if (tbp >= trace_buffer_wrap) | |
3470 | tbp -= (trace_buffer_wrap - trace_buffer_lo); | |
3471 | ||
3472 | /* Trim to the remaining bytes if we're close to the end. */ | |
3473 | if (num > tot - offset) | |
3474 | num = tot - offset; | |
3475 | ||
3476 | /* Trim to available packet size. */ | |
3477 | if (num >= (PBUFSIZ - 16) / 2 ) | |
3478 | num = (PBUFSIZ - 16) / 2; | |
3479 | ||
3480 | convert_int_to_ascii (tbp, own_buf, num); | |
3481 | own_buf[num] = '\0'; | |
3482 | } | |
3483 | ||
3484 | static void | |
3485 | cmd_bigqtbuffer (char *own_buf) | |
3486 | { | |
3487 | ULONGEST val; | |
3488 | char *packet = own_buf; | |
3489 | ||
3490 | packet += strlen ("QTBuffer:"); | |
3491 | ||
3492 | if (strncmp ("circular:", packet, strlen ("circular:")) == 0) | |
3493 | { | |
3494 | packet += strlen ("circular:"); | |
f8f67713 | 3495 | unpack_varlen_hex (packet, &val); |
219f2f23 PA |
3496 | circular_trace_buffer = val; |
3497 | trace_debug ("Trace buffer is now %s", | |
3498 | circular_trace_buffer ? "circular" : "linear"); | |
3499 | write_ok (own_buf); | |
3500 | } | |
3501 | else | |
3502 | write_enn (own_buf); | |
3503 | } | |
3504 | ||
3505 | int | |
3506 | handle_tracepoint_general_set (char *packet) | |
3507 | { | |
3508 | if (strcmp ("QTinit", packet) == 0) | |
3509 | { | |
3510 | cmd_qtinit (packet); | |
3511 | return 1; | |
3512 | } | |
3513 | else if (strncmp ("QTDP:", packet, strlen ("QTDP:")) == 0) | |
3514 | { | |
3515 | cmd_qtdp (packet); | |
3516 | return 1; | |
3517 | } | |
3518 | else if (strncmp ("QTDPsrc:", packet, strlen ("QTDPsrc:")) == 0) | |
3519 | { | |
3520 | cmd_qtdpsrc (packet); | |
3521 | return 1; | |
3522 | } | |
d248b706 KY |
3523 | else if (strncmp ("QTEnable:", packet, strlen ("QTEnable:")) == 0) |
3524 | { | |
3525 | cmd_qtenable_disable (packet, 1); | |
3526 | return 1; | |
3527 | } | |
3528 | else if (strncmp ("QTDisable:", packet, strlen ("QTDisable:")) == 0) | |
3529 | { | |
3530 | cmd_qtenable_disable (packet, 0); | |
3531 | return 1; | |
3532 | } | |
219f2f23 PA |
3533 | else if (strncmp ("QTDV:", packet, strlen ("QTDV:")) == 0) |
3534 | { | |
3535 | cmd_qtdv (packet); | |
3536 | return 1; | |
3537 | } | |
3538 | else if (strncmp ("QTro:", packet, strlen ("QTro:")) == 0) | |
3539 | { | |
3540 | cmd_qtro (packet); | |
3541 | return 1; | |
3542 | } | |
3543 | else if (strcmp ("QTStart", packet) == 0) | |
3544 | { | |
3545 | cmd_qtstart (packet); | |
3546 | return 1; | |
3547 | } | |
3548 | else if (strcmp ("QTStop", packet) == 0) | |
3549 | { | |
3550 | cmd_qtstop (packet); | |
3551 | return 1; | |
3552 | } | |
8336d594 PA |
3553 | else if (strncmp ("QTDisconnected:", packet, |
3554 | strlen ("QTDisconnected:")) == 0) | |
3555 | { | |
3556 | cmd_qtdisconnected (packet); | |
3557 | return 1; | |
3558 | } | |
219f2f23 PA |
3559 | else if (strncmp ("QTFrame:", packet, strlen ("QTFrame:")) == 0) |
3560 | { | |
3561 | cmd_qtframe (packet); | |
3562 | return 1; | |
3563 | } | |
3564 | else if (strncmp ("QTBuffer:", packet, strlen ("QTBuffer:")) == 0) | |
3565 | { | |
3566 | cmd_bigqtbuffer (packet); | |
3567 | return 1; | |
3568 | } | |
3569 | ||
3570 | return 0; | |
3571 | } | |
3572 | ||
3573 | int | |
3574 | handle_tracepoint_query (char *packet) | |
3575 | { | |
3576 | if (strcmp ("qTStatus", packet) == 0) | |
3577 | { | |
3578 | cmd_qtstatus (packet); | |
3579 | return 1; | |
3580 | } | |
3581 | else if (strcmp ("qTfP", packet) == 0) | |
3582 | { | |
3583 | cmd_qtfp (packet); | |
3584 | return 1; | |
3585 | } | |
3586 | else if (strcmp ("qTsP", packet) == 0) | |
3587 | { | |
3588 | cmd_qtsp (packet); | |
3589 | return 1; | |
3590 | } | |
3591 | else if (strcmp ("qTfV", packet) == 0) | |
3592 | { | |
3593 | cmd_qtfv (packet); | |
3594 | return 1; | |
3595 | } | |
3596 | else if (strcmp ("qTsV", packet) == 0) | |
3597 | { | |
3598 | cmd_qtsv (packet); | |
3599 | return 1; | |
3600 | } | |
3601 | else if (strncmp ("qTV:", packet, strlen ("qTV:")) == 0) | |
3602 | { | |
3603 | cmd_qtv (packet); | |
3604 | return 1; | |
3605 | } | |
3606 | else if (strncmp ("qTBuffer:", packet, strlen ("qTBuffer:")) == 0) | |
3607 | { | |
3608 | cmd_qtbuffer (packet); | |
3609 | return 1; | |
3610 | } | |
0fb4aa4b PA |
3611 | else if (strcmp ("qTfSTM", packet) == 0) |
3612 | { | |
3613 | cmd_qtfstm (packet); | |
3614 | return 1; | |
3615 | } | |
3616 | else if (strcmp ("qTsSTM", packet) == 0) | |
3617 | { | |
3618 | cmd_qtsstm (packet); | |
3619 | return 1; | |
3620 | } | |
3621 | else if (strncmp ("qTSTMat:", packet, strlen ("qTSTMat:")) == 0) | |
3622 | { | |
3623 | cmd_qtstmat (packet); | |
3624 | return 1; | |
3625 | } | |
219f2f23 PA |
3626 | |
3627 | return 0; | |
3628 | } | |
3629 | ||
fa593d66 PA |
3630 | #endif |
3631 | #ifndef IN_PROCESS_AGENT | |
3632 | ||
219f2f23 PA |
3633 | /* Call this when thread TINFO has hit the tracepoint defined by |
3634 | TP_NUMBER and TP_ADDRESS, and that tracepoint has a while-stepping | |
3635 | action. This adds a while-stepping collecting state item to the | |
3636 | threads' collecting state list, so that we can keep track of | |
3637 | multiple simultaneous while-stepping actions being collected by the | |
3638 | same thread. This can happen in cases like: | |
3639 | ||
3640 | ff0001 INSN1 <-- TP1, while-stepping 10 collect $regs | |
3641 | ff0002 INSN2 | |
3642 | ff0003 INSN3 <-- TP2, collect $regs | |
3643 | ff0004 INSN4 <-- TP3, while-stepping 10 collect $regs | |
3644 | ff0005 INSN5 | |
3645 | ||
3646 | Notice that when instruction INSN5 is reached, the while-stepping | |
3647 | actions of both TP1 and TP3 are still being collected, and that TP2 | |
3648 | had been collected meanwhile. The whole range of ff0001-ff0005 | |
3649 | should be single-stepped, due to at least TP1's while-stepping | |
3650 | action covering the whole range. */ | |
3651 | ||
3652 | static void | |
3653 | add_while_stepping_state (struct thread_info *tinfo, | |
3654 | int tp_number, CORE_ADDR tp_address) | |
3655 | { | |
3656 | struct wstep_state *wstep; | |
3657 | ||
3658 | wstep = xmalloc (sizeof (*wstep)); | |
3659 | wstep->next = tinfo->while_stepping; | |
3660 | ||
3661 | wstep->tp_number = tp_number; | |
3662 | wstep->tp_address = tp_address; | |
3663 | wstep->current_step = 0; | |
3664 | ||
3665 | tinfo->while_stepping = wstep; | |
3666 | } | |
3667 | ||
3668 | /* Release the while-stepping collecting state WSTEP. */ | |
3669 | ||
3670 | static void | |
3671 | release_while_stepping_state (struct wstep_state *wstep) | |
3672 | { | |
3673 | free (wstep); | |
3674 | } | |
3675 | ||
3676 | /* Release all while-stepping collecting states currently associated | |
3677 | with thread TINFO. */ | |
3678 | ||
3679 | void | |
3680 | release_while_stepping_state_list (struct thread_info *tinfo) | |
3681 | { | |
3682 | struct wstep_state *head; | |
3683 | ||
3684 | while (tinfo->while_stepping) | |
3685 | { | |
3686 | head = tinfo->while_stepping; | |
3687 | tinfo->while_stepping = head->next; | |
3688 | release_while_stepping_state (head); | |
3689 | } | |
3690 | } | |
3691 | ||
3692 | /* If TINFO was handling a 'while-stepping' action, the step has | |
3693 | finished, so collect any step data needed, and check if any more | |
3694 | steps are required. Return true if the thread was indeed | |
3695 | collecting tracepoint data, false otherwise. */ | |
3696 | ||
3697 | int | |
3698 | tracepoint_finished_step (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
3699 | { | |
3700 | struct tracepoint *tpoint; | |
3701 | struct wstep_state *wstep; | |
3702 | struct wstep_state **wstep_link; | |
3703 | struct trap_tracepoint_ctx ctx; | |
3704 | ||
fa593d66 PA |
3705 | /* Pull in fast tracepoint trace frames from the inferior lib buffer into |
3706 | our buffer. */ | |
3707 | if (in_process_agent_loaded ()) | |
3708 | upload_fast_traceframes (); | |
3709 | ||
219f2f23 PA |
3710 | /* Check if we were indeed collecting data for one of more |
3711 | tracepoints with a 'while-stepping' count. */ | |
3712 | if (tinfo->while_stepping == NULL) | |
3713 | return 0; | |
3714 | ||
3715 | if (!tracing) | |
3716 | { | |
3717 | /* We're not even tracing anymore. Stop this thread from | |
3718 | collecting. */ | |
3719 | release_while_stepping_state_list (tinfo); | |
3720 | ||
3721 | /* The thread had stopped due to a single-step request indeed | |
3722 | explained by a tracepoint. */ | |
3723 | return 1; | |
3724 | } | |
3725 | ||
3726 | wstep = tinfo->while_stepping; | |
3727 | wstep_link = &tinfo->while_stepping; | |
3728 | ||
3729 | trace_debug ("Thread %s finished a single-step for tracepoint %d at 0x%s", | |
3730 | target_pid_to_str (tinfo->entry.id), | |
3731 | wstep->tp_number, paddress (wstep->tp_address)); | |
3732 | ||
fa593d66 | 3733 | ctx.base.type = trap_tracepoint; |
219f2f23 PA |
3734 | ctx.regcache = get_thread_regcache (tinfo, 1); |
3735 | ||
3736 | while (wstep != NULL) | |
3737 | { | |
3738 | tpoint = find_tracepoint (wstep->tp_number, wstep->tp_address); | |
3739 | if (tpoint == NULL) | |
3740 | { | |
3741 | trace_debug ("NO TRACEPOINT %d at 0x%s FOR THREAD %s!", | |
3742 | wstep->tp_number, paddress (wstep->tp_address), | |
3743 | target_pid_to_str (tinfo->entry.id)); | |
3744 | ||
3745 | /* Unlink. */ | |
3746 | *wstep_link = wstep->next; | |
3747 | release_while_stepping_state (wstep); | |
4f269b12 | 3748 | wstep = *wstep_link; |
219f2f23 PA |
3749 | continue; |
3750 | } | |
3751 | ||
3752 | /* We've just finished one step. */ | |
3753 | ++wstep->current_step; | |
3754 | ||
3755 | /* Collect data. */ | |
3756 | collect_data_at_step ((struct tracepoint_hit_ctx *) &ctx, | |
3757 | stop_pc, tpoint, wstep->current_step); | |
3758 | ||
3759 | if (wstep->current_step >= tpoint->step_count) | |
3760 | { | |
3761 | /* The requested numbers of steps have occurred. */ | |
3762 | trace_debug ("Thread %s done stepping for tracepoint %d at 0x%s", | |
3763 | target_pid_to_str (tinfo->entry.id), | |
3764 | wstep->tp_number, paddress (wstep->tp_address)); | |
3765 | ||
3766 | /* Unlink the wstep. */ | |
3767 | *wstep_link = wstep->next; | |
3768 | release_while_stepping_state (wstep); | |
3769 | wstep = *wstep_link; | |
3770 | ||
3771 | /* Only check the hit count now, which ensure that we do all | |
3772 | our stepping before stopping the run. */ | |
3773 | if (tpoint->pass_count > 0 | |
3774 | && tpoint->hit_count >= tpoint->pass_count | |
3775 | && stopping_tracepoint == NULL) | |
3776 | stopping_tracepoint = tpoint; | |
3777 | } | |
3778 | else | |
3779 | { | |
3780 | /* Keep single-stepping until the requested numbers of steps | |
3781 | have occurred. */ | |
3782 | wstep_link = &wstep->next; | |
3783 | wstep = *wstep_link; | |
3784 | } | |
3785 | ||
3786 | if (stopping_tracepoint | |
3787 | || trace_buffer_is_full | |
3788 | || expr_eval_result != expr_eval_no_error) | |
3789 | { | |
3790 | stop_tracing (); | |
3791 | break; | |
3792 | } | |
3793 | } | |
3794 | ||
3795 | return 1; | |
3796 | } | |
3797 | ||
fa593d66 PA |
3798 | /* Handle any internal tracing control breakpoint hits. That means, |
3799 | pull traceframes from the IPA to our buffer, and syncing both | |
3800 | tracing agents when the IPA's tracing stops for some reason. */ | |
3801 | ||
3802 | int | |
3803 | handle_tracepoint_bkpts (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
3804 | { | |
3805 | /* Pull in fast tracepoint trace frames from the inferior in-process | |
3806 | agent's buffer into our buffer. */ | |
3807 | ||
3808 | if (!in_process_agent_loaded ()) | |
3809 | return 0; | |
3810 | ||
3811 | upload_fast_traceframes (); | |
3812 | ||
3813 | /* Check if the in-process agent had decided we should stop | |
3814 | tracing. */ | |
3815 | if (stop_pc == ipa_sym_addrs.addr_stop_tracing) | |
3816 | { | |
3817 | int ipa_trace_buffer_is_full; | |
3818 | CORE_ADDR ipa_stopping_tracepoint; | |
3819 | int ipa_expr_eval_result; | |
3820 | CORE_ADDR ipa_error_tracepoint; | |
3821 | ||
3822 | trace_debug ("lib stopped at stop_tracing"); | |
3823 | ||
3824 | read_inferior_integer (ipa_sym_addrs.addr_trace_buffer_is_full, | |
3825 | &ipa_trace_buffer_is_full); | |
3826 | ||
3827 | read_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, | |
3828 | &ipa_stopping_tracepoint); | |
3829 | write_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, 0); | |
3830 | ||
3831 | read_inferior_data_pointer (ipa_sym_addrs.addr_error_tracepoint, | |
3832 | &ipa_error_tracepoint); | |
3833 | write_inferior_data_pointer (ipa_sym_addrs.addr_error_tracepoint, 0); | |
3834 | ||
3835 | read_inferior_integer (ipa_sym_addrs.addr_expr_eval_result, | |
3836 | &ipa_expr_eval_result); | |
3837 | write_inferior_integer (ipa_sym_addrs.addr_expr_eval_result, 0); | |
3838 | ||
3839 | trace_debug ("lib: trace_buffer_is_full: %d, " | |
3840 | "stopping_tracepoint: %s, " | |
3841 | "ipa_expr_eval_result: %d, " | |
3842 | "error_tracepoint: %s, ", | |
3843 | ipa_trace_buffer_is_full, | |
3844 | paddress (ipa_stopping_tracepoint), | |
3845 | ipa_expr_eval_result, | |
3846 | paddress (ipa_error_tracepoint)); | |
3847 | ||
3848 | if (debug_threads) | |
3849 | { | |
3850 | if (ipa_trace_buffer_is_full) | |
3851 | trace_debug ("lib stopped due to full buffer."); | |
3852 | if (ipa_stopping_tracepoint) | |
3853 | trace_debug ("lib stopped due to tpoint"); | |
3854 | if (ipa_stopping_tracepoint) | |
3855 | trace_debug ("lib stopped due to error"); | |
3856 | } | |
3857 | ||
3858 | if (ipa_stopping_tracepoint != 0) | |
3859 | { | |
3860 | stopping_tracepoint | |
3861 | = fast_tracepoint_from_ipa_tpoint_address (ipa_stopping_tracepoint); | |
3862 | } | |
3863 | else if (ipa_expr_eval_result != expr_eval_no_error) | |
3864 | { | |
3865 | expr_eval_result = ipa_expr_eval_result; | |
3866 | error_tracepoint | |
3867 | = fast_tracepoint_from_ipa_tpoint_address (ipa_error_tracepoint); | |
3868 | } | |
3869 | stop_tracing (); | |
3870 | return 1; | |
3871 | } | |
3872 | else if (stop_pc == ipa_sym_addrs.addr_flush_trace_buffer) | |
3873 | { | |
3874 | trace_debug ("lib stopped at flush_trace_buffer"); | |
3875 | return 1; | |
3876 | } | |
3877 | ||
3878 | return 0; | |
3879 | } | |
3880 | ||
219f2f23 PA |
3881 | /* Return true if TINFO just hit a tracepoint. Collect data if |
3882 | so. */ | |
3883 | ||
3884 | int | |
3885 | tracepoint_was_hit (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
3886 | { | |
3887 | struct tracepoint *tpoint; | |
3888 | int ret = 0; | |
3889 | struct trap_tracepoint_ctx ctx; | |
3890 | ||
3891 | /* Not tracing, don't handle. */ | |
3892 | if (!tracing) | |
3893 | return 0; | |
3894 | ||
fa593d66 | 3895 | ctx.base.type = trap_tracepoint; |
219f2f23 PA |
3896 | ctx.regcache = get_thread_regcache (tinfo, 1); |
3897 | ||
3898 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
3899 | { | |
fa593d66 PA |
3900 | /* Note that we collect fast tracepoints here as well. We'll |
3901 | step over the fast tracepoint jump later, which avoids the | |
3902 | double collect. */ | |
219f2f23 PA |
3903 | if (tpoint->enabled && stop_pc == tpoint->address) |
3904 | { | |
3905 | trace_debug ("Thread %s at address of tracepoint %d at 0x%s", | |
3906 | target_pid_to_str (tinfo->entry.id), | |
3907 | tpoint->number, paddress (tpoint->address)); | |
3908 | ||
3909 | /* Test the condition if present, and collect if true. */ | |
3910 | if (!tpoint->cond | |
3911 | || (condition_true_at_tracepoint | |
3912 | ((struct tracepoint_hit_ctx *) &ctx, tpoint))) | |
3913 | collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
3914 | stop_pc, tpoint); | |
3915 | ||
3916 | if (stopping_tracepoint | |
3917 | || trace_buffer_is_full | |
3918 | || expr_eval_result != expr_eval_no_error) | |
3919 | { | |
3920 | stop_tracing (); | |
3921 | } | |
3922 | /* If the tracepoint had a 'while-stepping' action, then set | |
3923 | the thread to collect this tracepoint on the following | |
3924 | single-steps. */ | |
3925 | else if (tpoint->step_count > 0) | |
3926 | { | |
3927 | add_while_stepping_state (tinfo, | |
3928 | tpoint->number, tpoint->address); | |
3929 | } | |
3930 | ||
3931 | ret = 1; | |
3932 | } | |
3933 | } | |
3934 | ||
3935 | return ret; | |
3936 | } | |
3937 | ||
fa593d66 PA |
3938 | #endif |
3939 | ||
0fb4aa4b PA |
3940 | #if defined IN_PROCESS_AGENT && defined HAVE_UST |
3941 | struct ust_marker_data; | |
3942 | static void collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
3943 | CORE_ADDR stop_pc, | |
3944 | struct tracepoint *tpoint, | |
3945 | struct traceframe *tframe); | |
3946 | #endif | |
3947 | ||
219f2f23 PA |
3948 | /* Create a trace frame for the hit of the given tracepoint in the |
3949 | given thread. */ | |
3950 | ||
3951 | static void | |
3952 | collect_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, CORE_ADDR stop_pc, | |
3953 | struct tracepoint *tpoint) | |
3954 | { | |
3955 | struct traceframe *tframe; | |
3956 | int acti; | |
3957 | ||
3958 | /* Only count it as a hit when we actually collect data. */ | |
3959 | tpoint->hit_count++; | |
3960 | ||
3961 | /* If we've exceeded a defined pass count, record the event for | |
3962 | later, and finish the collection for this hit. This test is only | |
3963 | for nonstepping tracepoints, stepping tracepoints test at the end | |
3964 | of their while-stepping loop. */ | |
3965 | if (tpoint->pass_count > 0 | |
3966 | && tpoint->hit_count >= tpoint->pass_count | |
3967 | && tpoint->step_count == 0 | |
3968 | && stopping_tracepoint == NULL) | |
3969 | stopping_tracepoint = tpoint; | |
3970 | ||
3971 | trace_debug ("Making new traceframe for tracepoint %d at 0x%s, hit %ld", | |
3972 | tpoint->number, paddress (tpoint->address), tpoint->hit_count); | |
3973 | ||
3974 | tframe = add_traceframe (tpoint); | |
3975 | ||
3976 | if (tframe) | |
3977 | { | |
3978 | for (acti = 0; acti < tpoint->numactions; ++acti) | |
3979 | { | |
fa593d66 | 3980 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
3981 | trace_debug ("Tracepoint %d at 0x%s about to do action '%s'", |
3982 | tpoint->number, paddress (tpoint->address), | |
3983 | tpoint->actions_str[acti]); | |
fa593d66 | 3984 | #endif |
219f2f23 PA |
3985 | |
3986 | do_action_at_tracepoint (ctx, stop_pc, tpoint, tframe, | |
3987 | tpoint->actions[acti]); | |
3988 | } | |
3989 | ||
3990 | finish_traceframe (tframe); | |
3991 | } | |
3992 | ||
3993 | if (tframe == NULL && tracing) | |
3994 | trace_buffer_is_full = 1; | |
3995 | } | |
3996 | ||
fa593d66 PA |
3997 | #ifndef IN_PROCESS_AGENT |
3998 | ||
219f2f23 PA |
3999 | static void |
4000 | collect_data_at_step (struct tracepoint_hit_ctx *ctx, | |
4001 | CORE_ADDR stop_pc, | |
4002 | struct tracepoint *tpoint, int current_step) | |
4003 | { | |
4004 | struct traceframe *tframe; | |
4005 | int acti; | |
4006 | ||
4007 | trace_debug ("Making new step traceframe for " | |
4008 | "tracepoint %d at 0x%s, step %d of %ld, hit %ld", | |
4009 | tpoint->number, paddress (tpoint->address), | |
4010 | current_step, tpoint->step_count, | |
4011 | tpoint->hit_count); | |
4012 | ||
4013 | tframe = add_traceframe (tpoint); | |
4014 | ||
4015 | if (tframe) | |
4016 | { | |
4017 | for (acti = 0; acti < tpoint->num_step_actions; ++acti) | |
4018 | { | |
4019 | trace_debug ("Tracepoint %d at 0x%s about to do step action '%s'", | |
4020 | tpoint->number, paddress (tpoint->address), | |
4021 | tpoint->step_actions_str[acti]); | |
4022 | ||
4023 | do_action_at_tracepoint (ctx, stop_pc, tpoint, tframe, | |
4024 | tpoint->step_actions[acti]); | |
4025 | } | |
4026 | ||
4027 | finish_traceframe (tframe); | |
4028 | } | |
4029 | ||
4030 | if (tframe == NULL && tracing) | |
4031 | trace_buffer_is_full = 1; | |
4032 | } | |
4033 | ||
fa593d66 PA |
4034 | #endif |
4035 | ||
219f2f23 PA |
4036 | static struct regcache * |
4037 | get_context_regcache (struct tracepoint_hit_ctx *ctx) | |
4038 | { | |
fa593d66 PA |
4039 | struct regcache *regcache = NULL; |
4040 | ||
4041 | #ifdef IN_PROCESS_AGENT | |
4042 | if (ctx->type == fast_tracepoint) | |
4043 | { | |
4044 | struct fast_tracepoint_ctx *fctx = (struct fast_tracepoint_ctx *) ctx; | |
4045 | if (!fctx->regcache_initted) | |
4046 | { | |
4047 | fctx->regcache_initted = 1; | |
4048 | init_register_cache (&fctx->regcache, fctx->regspace); | |
4049 | supply_regblock (&fctx->regcache, NULL); | |
4050 | supply_fast_tracepoint_registers (&fctx->regcache, fctx->regs); | |
4051 | } | |
4052 | regcache = &fctx->regcache; | |
4053 | } | |
0fb4aa4b PA |
4054 | #ifdef HAVE_UST |
4055 | if (ctx->type == static_tracepoint) | |
4056 | { | |
493e2a69 MS |
4057 | struct static_tracepoint_ctx *sctx |
4058 | = (struct static_tracepoint_ctx *) ctx; | |
4059 | ||
0fb4aa4b PA |
4060 | if (!sctx->regcache_initted) |
4061 | { | |
4062 | sctx->regcache_initted = 1; | |
4063 | init_register_cache (&sctx->regcache, sctx->regspace); | |
4064 | supply_regblock (&sctx->regcache, NULL); | |
4065 | /* Pass down the tracepoint address, because REGS doesn't | |
4066 | include the PC, but we know what it must have been. */ | |
4067 | supply_static_tracepoint_registers (&sctx->regcache, | |
4068 | (const unsigned char *) | |
4069 | sctx->regs, | |
4070 | sctx->tpoint->address); | |
4071 | } | |
4072 | regcache = &sctx->regcache; | |
4073 | } | |
4074 | #endif | |
fa593d66 PA |
4075 | #else |
4076 | if (ctx->type == trap_tracepoint) | |
4077 | { | |
4078 | struct trap_tracepoint_ctx *tctx = (struct trap_tracepoint_ctx *) ctx; | |
4079 | regcache = tctx->regcache; | |
4080 | } | |
4081 | #endif | |
219f2f23 PA |
4082 | |
4083 | gdb_assert (regcache != NULL); | |
4084 | ||
4085 | return regcache; | |
4086 | } | |
4087 | ||
4088 | static void | |
4089 | do_action_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
4090 | CORE_ADDR stop_pc, | |
4091 | struct tracepoint *tpoint, | |
4092 | struct traceframe *tframe, | |
4093 | struct tracepoint_action *taction) | |
4094 | { | |
4095 | enum eval_result_type err; | |
4096 | ||
4097 | switch (taction->type) | |
4098 | { | |
4099 | case 'M': | |
4100 | { | |
4101 | struct collect_memory_action *maction; | |
4102 | ||
4103 | maction = (struct collect_memory_action *) taction; | |
4104 | ||
4105 | trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)", | |
4106 | pulongest (maction->len), | |
4107 | paddress (maction->addr), maction->basereg); | |
4108 | /* (should use basereg) */ | |
4109 | agent_mem_read (tframe, NULL, | |
4110 | (CORE_ADDR) maction->addr, maction->len); | |
4111 | break; | |
4112 | } | |
4113 | case 'R': | |
4114 | { | |
219f2f23 PA |
4115 | unsigned char *regspace; |
4116 | struct regcache tregcache; | |
4117 | struct regcache *context_regcache; | |
4118 | ||
219f2f23 PA |
4119 | |
4120 | trace_debug ("Want to collect registers"); | |
4121 | ||
4122 | /* Collect all registers for now. */ | |
4123 | regspace = add_traceframe_block (tframe, | |
4124 | 1 + register_cache_size ()); | |
4125 | if (regspace == NULL) | |
4126 | { | |
4127 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
4128 | break; | |
4129 | } | |
4130 | /* Identify a register block. */ | |
4131 | *regspace = 'R'; | |
4132 | ||
4133 | context_regcache = get_context_regcache (ctx); | |
4134 | ||
4135 | /* Wrap the regblock in a register cache (in the stack, we | |
4136 | don't want to malloc here). */ | |
4137 | init_register_cache (&tregcache, regspace + 1); | |
4138 | ||
4139 | /* Copy the register data to the regblock. */ | |
4140 | regcache_cpy (&tregcache, context_regcache); | |
4141 | ||
fa593d66 | 4142 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
4143 | /* On some platforms, trap-based tracepoints will have the PC |
4144 | pointing to the next instruction after the trap, but we | |
4145 | don't want the user or GDB trying to guess whether the | |
4146 | saved PC needs adjusting; so always record the adjusted | |
4147 | stop_pc. Note that we can't use tpoint->address instead, | |
fa593d66 PA |
4148 | since it will be wrong for while-stepping actions. This |
4149 | adjustment is a nop for fast tracepoints collected from the | |
4150 | in-process lib (but not if GDBserver is collecting one | |
4151 | preemptively), since the PC had already been adjusted to | |
4152 | contain the tracepoint's address by the jump pad. */ | |
219f2f23 PA |
4153 | trace_debug ("Storing stop pc (0x%s) in regblock", |
4154 | paddress (tpoint->address)); | |
4155 | ||
4156 | /* This changes the regblock, not the thread's | |
4157 | regcache. */ | |
4158 | regcache_write_pc (&tregcache, stop_pc); | |
fa593d66 | 4159 | #endif |
219f2f23 PA |
4160 | } |
4161 | break; | |
4162 | case 'X': | |
4163 | { | |
4164 | struct eval_expr_action *eaction; | |
4165 | ||
4166 | eaction = (struct eval_expr_action *) taction; | |
4167 | ||
4168 | trace_debug ("Want to evaluate expression"); | |
4169 | ||
4170 | err = eval_agent_expr (ctx, tframe, eaction->expr, NULL); | |
4171 | ||
4172 | if (err != expr_eval_no_error) | |
4173 | { | |
4174 | record_tracepoint_error (tpoint, "action expression", err); | |
4175 | return; | |
4176 | } | |
4177 | } | |
4178 | break; | |
0fb4aa4b PA |
4179 | case 'L': |
4180 | { | |
4181 | #if defined IN_PROCESS_AGENT && defined HAVE_UST | |
4182 | trace_debug ("Want to collect static trace data"); | |
4183 | collect_ust_data_at_tracepoint (ctx, stop_pc, | |
4184 | tpoint, tframe); | |
4185 | #else | |
4186 | trace_debug ("warning: collecting static trace data, " | |
4187 | "but static tracepoints are not supported"); | |
4188 | #endif | |
4189 | } | |
4190 | break; | |
219f2f23 PA |
4191 | default: |
4192 | trace_debug ("unknown trace action '%c', ignoring", taction->type); | |
4193 | break; | |
4194 | } | |
4195 | } | |
4196 | ||
4197 | static int | |
4198 | condition_true_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
4199 | struct tracepoint *tpoint) | |
4200 | { | |
4201 | ULONGEST value = 0; | |
4202 | enum eval_result_type err; | |
4203 | ||
c6beb2cb PA |
4204 | /* Presently, gdbserver doesn't run compiled conditions, only the |
4205 | IPA does. If the program stops at a fast tracepoint's address | |
4206 | (e.g., due to a breakpoint, trap tracepoint, or stepping), | |
4207 | gdbserver preemptively collect the fast tracepoint. Later, on | |
4208 | resume, gdbserver steps over the fast tracepoint like it steps | |
4209 | over breakpoints, so that the IPA doesn't see that fast | |
4210 | tracepoint. This avoids double collects of fast tracepoints in | |
4211 | that stopping scenario. Having gdbserver itself handle the fast | |
4212 | tracepoint gives the user a consistent view of when fast or trap | |
4213 | tracepoints are collected, compared to an alternative where only | |
4214 | trap tracepoints are collected on stop, and fast tracepoints on | |
4215 | resume. When a fast tracepoint is being processed by gdbserver, | |
4216 | it is always the non-compiled condition expression that is | |
4217 | used. */ | |
4218 | #ifdef IN_PROCESS_AGENT | |
6a271cae PA |
4219 | if (tpoint->compiled_cond) |
4220 | err = ((condfn) (uintptr_t) (tpoint->compiled_cond)) (ctx, &value); | |
4221 | else | |
c6beb2cb | 4222 | #endif |
6a271cae | 4223 | err = eval_agent_expr (ctx, NULL, tpoint->cond, &value); |
219f2f23 PA |
4224 | |
4225 | if (err != expr_eval_no_error) | |
4226 | { | |
4227 | record_tracepoint_error (tpoint, "condition", err); | |
4228 | /* The error case must return false. */ | |
4229 | return 0; | |
4230 | } | |
4231 | ||
4232 | trace_debug ("Tracepoint %d at 0x%s condition evals to %s", | |
4233 | tpoint->number, paddress (tpoint->address), | |
4234 | pulongest (value)); | |
4235 | return (value ? 1 : 0); | |
4236 | } | |
4237 | ||
fa593d66 PA |
4238 | #ifndef IN_PROCESS_AGENT |
4239 | ||
219f2f23 PA |
4240 | /* The packet form of an agent expression consists of an 'X', number |
4241 | of bytes in expression, a comma, and then the bytes. */ | |
4242 | ||
4243 | static struct agent_expr * | |
4244 | parse_agent_expr (char **actparm) | |
4245 | { | |
4246 | char *act = *actparm; | |
4247 | ULONGEST xlen; | |
4248 | struct agent_expr *aexpr; | |
4249 | ||
4250 | ++act; /* skip the X */ | |
4251 | act = unpack_varlen_hex (act, &xlen); | |
4252 | ++act; /* skip a comma */ | |
4253 | aexpr = xmalloc (sizeof (struct agent_expr)); | |
4254 | aexpr->length = xlen; | |
4255 | aexpr->bytes = xmalloc (xlen); | |
4256 | convert_ascii_to_int (act, aexpr->bytes, xlen); | |
4257 | *actparm = act + (xlen * 2); | |
4258 | return aexpr; | |
4259 | } | |
4260 | ||
4261 | /* Convert the bytes of an agent expression back into hex digits, so | |
4262 | they can be printed or uploaded. This allocates the buffer, | |
4263 | callers should free when they are done with it. */ | |
4264 | ||
4265 | static char * | |
4266 | unparse_agent_expr (struct agent_expr *aexpr) | |
4267 | { | |
4268 | char *rslt; | |
4269 | ||
4270 | rslt = xmalloc (2 * aexpr->length + 1); | |
4271 | convert_int_to_ascii (aexpr->bytes, rslt, aexpr->length); | |
4272 | return rslt; | |
4273 | } | |
4274 | ||
fa593d66 PA |
4275 | #endif |
4276 | ||
94d5e490 TT |
4277 | /* A wrapper for gdb_agent_op_names that does some bounds-checking. */ |
4278 | ||
4279 | static const char * | |
4280 | gdb_agent_op_name (int op) | |
4281 | { | |
4282 | if (op < 0 || op >= gdb_agent_op_last || gdb_agent_op_names[op] == NULL) | |
4283 | return "?undef?"; | |
4284 | return gdb_agent_op_names[op]; | |
4285 | } | |
4286 | ||
219f2f23 PA |
4287 | /* The agent expression evaluator, as specified by the GDB docs. It |
4288 | returns 0 if everything went OK, and a nonzero error code | |
4289 | otherwise. */ | |
4290 | ||
4291 | static enum eval_result_type | |
4292 | eval_agent_expr (struct tracepoint_hit_ctx *ctx, | |
4293 | struct traceframe *tframe, | |
4294 | struct agent_expr *aexpr, | |
4295 | ULONGEST *rslt) | |
4296 | { | |
4297 | int pc = 0; | |
4298 | #define STACK_MAX 100 | |
4299 | ULONGEST stack[STACK_MAX], top; | |
4300 | int sp = 0; | |
4301 | unsigned char op; | |
4302 | int arg; | |
4303 | ||
4304 | /* This union is a convenient way to convert representations. For | |
4305 | now, assume a standard architecture where the hardware integer | |
4306 | types have 8, 16, 32, 64 bit types. A more robust solution would | |
4307 | be to import stdint.h from gnulib. */ | |
4308 | union | |
4309 | { | |
4310 | union | |
4311 | { | |
4312 | unsigned char bytes[1]; | |
4313 | unsigned char val; | |
4314 | } u8; | |
4315 | union | |
4316 | { | |
4317 | unsigned char bytes[2]; | |
4318 | unsigned short val; | |
4319 | } u16; | |
4320 | union | |
4321 | { | |
4322 | unsigned char bytes[4]; | |
4323 | unsigned int val; | |
4324 | } u32; | |
4325 | union | |
4326 | { | |
4327 | unsigned char bytes[8]; | |
4328 | ULONGEST val; | |
4329 | } u64; | |
4330 | } cnv; | |
4331 | ||
4332 | if (aexpr->length == 0) | |
4333 | { | |
4334 | trace_debug ("empty agent expression"); | |
4335 | return expr_eval_empty_expression; | |
4336 | } | |
4337 | ||
4338 | /* Cache the stack top in its own variable. Much of the time we can | |
4339 | operate on this variable, rather than dinking with the stack. It | |
4340 | needs to be copied to the stack when sp changes. */ | |
4341 | top = 0; | |
4342 | ||
4343 | while (1) | |
4344 | { | |
4345 | op = aexpr->bytes[pc++]; | |
4346 | ||
4347 | trace_debug ("About to interpret byte 0x%x", op); | |
4348 | ||
4349 | switch (op) | |
4350 | { | |
4351 | case gdb_agent_op_add: | |
4352 | top += stack[--sp]; | |
4353 | break; | |
4354 | ||
4355 | case gdb_agent_op_sub: | |
4356 | top = stack[--sp] - top; | |
4357 | break; | |
4358 | ||
4359 | case gdb_agent_op_mul: | |
4360 | top *= stack[--sp]; | |
4361 | break; | |
4362 | ||
4363 | case gdb_agent_op_div_signed: | |
4364 | if (top == 0) | |
4365 | { | |
4366 | trace_debug ("Attempted to divide by zero"); | |
4367 | return expr_eval_divide_by_zero; | |
4368 | } | |
4369 | top = ((LONGEST) stack[--sp]) / ((LONGEST) top); | |
4370 | break; | |
4371 | ||
4372 | case gdb_agent_op_div_unsigned: | |
4373 | if (top == 0) | |
4374 | { | |
4375 | trace_debug ("Attempted to divide by zero"); | |
4376 | return expr_eval_divide_by_zero; | |
4377 | } | |
4378 | top = stack[--sp] / top; | |
4379 | break; | |
4380 | ||
4381 | case gdb_agent_op_rem_signed: | |
4382 | if (top == 0) | |
4383 | { | |
4384 | trace_debug ("Attempted to divide by zero"); | |
4385 | return expr_eval_divide_by_zero; | |
4386 | } | |
4387 | top = ((LONGEST) stack[--sp]) % ((LONGEST) top); | |
4388 | break; | |
4389 | ||
4390 | case gdb_agent_op_rem_unsigned: | |
4391 | if (top == 0) | |
4392 | { | |
4393 | trace_debug ("Attempted to divide by zero"); | |
4394 | return expr_eval_divide_by_zero; | |
4395 | } | |
4396 | top = stack[--sp] % top; | |
4397 | break; | |
4398 | ||
4399 | case gdb_agent_op_lsh: | |
4400 | top = stack[--sp] << top; | |
4401 | break; | |
4402 | ||
4403 | case gdb_agent_op_rsh_signed: | |
4404 | top = ((LONGEST) stack[--sp]) >> top; | |
4405 | break; | |
4406 | ||
4407 | case gdb_agent_op_rsh_unsigned: | |
4408 | top = stack[--sp] >> top; | |
4409 | break; | |
4410 | ||
4411 | case gdb_agent_op_trace: | |
4412 | agent_mem_read (tframe, | |
4413 | NULL, (CORE_ADDR) stack[--sp], (ULONGEST) top); | |
4414 | if (--sp >= 0) | |
4415 | top = stack[sp]; | |
4416 | break; | |
4417 | ||
4418 | case gdb_agent_op_trace_quick: | |
4419 | arg = aexpr->bytes[pc++]; | |
4420 | agent_mem_read (tframe, NULL, (CORE_ADDR) top, (ULONGEST) arg); | |
4421 | break; | |
4422 | ||
4423 | case gdb_agent_op_log_not: | |
4424 | top = !top; | |
4425 | break; | |
4426 | ||
4427 | case gdb_agent_op_bit_and: | |
4428 | top &= stack[--sp]; | |
4429 | break; | |
4430 | ||
4431 | case gdb_agent_op_bit_or: | |
4432 | top |= stack[--sp]; | |
4433 | break; | |
4434 | ||
4435 | case gdb_agent_op_bit_xor: | |
4436 | top ^= stack[--sp]; | |
4437 | break; | |
4438 | ||
4439 | case gdb_agent_op_bit_not: | |
4440 | top = ~top; | |
4441 | break; | |
4442 | ||
4443 | case gdb_agent_op_equal: | |
4444 | top = (stack[--sp] == top); | |
4445 | break; | |
4446 | ||
4447 | case gdb_agent_op_less_signed: | |
4448 | top = (((LONGEST) stack[--sp]) < ((LONGEST) top)); | |
4449 | break; | |
4450 | ||
4451 | case gdb_agent_op_less_unsigned: | |
4452 | top = (stack[--sp] < top); | |
4453 | break; | |
4454 | ||
4455 | case gdb_agent_op_ext: | |
4456 | arg = aexpr->bytes[pc++]; | |
4457 | if (arg < (sizeof (LONGEST) * 8)) | |
4458 | { | |
4459 | LONGEST mask = 1 << (arg - 1); | |
4460 | top &= ((LONGEST) 1 << arg) - 1; | |
4461 | top = (top ^ mask) - mask; | |
4462 | } | |
4463 | break; | |
4464 | ||
4465 | case gdb_agent_op_ref8: | |
4466 | agent_mem_read (tframe, cnv.u8.bytes, (CORE_ADDR) top, 1); | |
4467 | top = cnv.u8.val; | |
4468 | break; | |
4469 | ||
4470 | case gdb_agent_op_ref16: | |
4471 | agent_mem_read (tframe, cnv.u16.bytes, (CORE_ADDR) top, 2); | |
4472 | top = cnv.u16.val; | |
4473 | break; | |
4474 | ||
4475 | case gdb_agent_op_ref32: | |
4476 | agent_mem_read (tframe, cnv.u32.bytes, (CORE_ADDR) top, 4); | |
4477 | top = cnv.u32.val; | |
4478 | break; | |
4479 | ||
4480 | case gdb_agent_op_ref64: | |
4481 | agent_mem_read (tframe, cnv.u64.bytes, (CORE_ADDR) top, 8); | |
4482 | top = cnv.u64.val; | |
4483 | break; | |
4484 | ||
4485 | case gdb_agent_op_if_goto: | |
4486 | if (top) | |
4487 | pc = (aexpr->bytes[pc] << 8) + (aexpr->bytes[pc + 1]); | |
4488 | else | |
4489 | pc += 2; | |
4490 | if (--sp >= 0) | |
4491 | top = stack[sp]; | |
4492 | break; | |
4493 | ||
4494 | case gdb_agent_op_goto: | |
4495 | pc = (aexpr->bytes[pc] << 8) + (aexpr->bytes[pc + 1]); | |
4496 | break; | |
4497 | ||
4498 | case gdb_agent_op_const8: | |
4499 | /* Flush the cached stack top. */ | |
4500 | stack[sp++] = top; | |
4501 | top = aexpr->bytes[pc++]; | |
4502 | break; | |
4503 | ||
4504 | case gdb_agent_op_const16: | |
4505 | /* Flush the cached stack top. */ | |
4506 | stack[sp++] = top; | |
4507 | top = aexpr->bytes[pc++]; | |
4508 | top = (top << 8) + aexpr->bytes[pc++]; | |
4509 | break; | |
4510 | ||
4511 | case gdb_agent_op_const32: | |
4512 | /* Flush the cached stack top. */ | |
4513 | stack[sp++] = top; | |
4514 | top = aexpr->bytes[pc++]; | |
4515 | top = (top << 8) + aexpr->bytes[pc++]; | |
4516 | top = (top << 8) + aexpr->bytes[pc++]; | |
4517 | top = (top << 8) + aexpr->bytes[pc++]; | |
4518 | break; | |
4519 | ||
4520 | case gdb_agent_op_const64: | |
4521 | /* Flush the cached stack top. */ | |
4522 | stack[sp++] = top; | |
4523 | top = aexpr->bytes[pc++]; | |
4524 | top = (top << 8) + aexpr->bytes[pc++]; | |
4525 | top = (top << 8) + aexpr->bytes[pc++]; | |
4526 | top = (top << 8) + aexpr->bytes[pc++]; | |
4527 | top = (top << 8) + aexpr->bytes[pc++]; | |
4528 | top = (top << 8) + aexpr->bytes[pc++]; | |
4529 | top = (top << 8) + aexpr->bytes[pc++]; | |
4530 | top = (top << 8) + aexpr->bytes[pc++]; | |
4531 | break; | |
4532 | ||
4533 | case gdb_agent_op_reg: | |
4534 | /* Flush the cached stack top. */ | |
4535 | stack[sp++] = top; | |
4536 | arg = aexpr->bytes[pc++]; | |
4537 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
4538 | { | |
4539 | int regnum = arg; | |
4540 | struct regcache *regcache; | |
4541 | ||
4542 | regcache = get_context_regcache (ctx); | |
4543 | ||
4544 | switch (register_size (regnum)) | |
4545 | { | |
4546 | case 8: | |
4547 | collect_register (regcache, regnum, cnv.u64.bytes); | |
4548 | top = cnv.u64.val; | |
4549 | break; | |
4550 | case 4: | |
4551 | collect_register (regcache, regnum, cnv.u32.bytes); | |
4552 | top = cnv.u32.val; | |
4553 | break; | |
4554 | case 2: | |
4555 | collect_register (regcache, regnum, cnv.u16.bytes); | |
4556 | top = cnv.u16.val; | |
4557 | break; | |
4558 | case 1: | |
4559 | collect_register (regcache, regnum, cnv.u8.bytes); | |
4560 | top = cnv.u8.val; | |
4561 | break; | |
4562 | default: | |
4563 | internal_error (__FILE__, __LINE__, | |
4564 | "unhandled register size"); | |
4565 | } | |
4566 | } | |
4567 | break; | |
4568 | ||
4569 | case gdb_agent_op_end: | |
4570 | trace_debug ("At end of expression, sp=%d, stack top cache=0x%s", | |
4571 | sp, pulongest (top)); | |
4572 | if (rslt) | |
4573 | { | |
4574 | if (sp <= 0) | |
4575 | { | |
4576 | /* This should be an error */ | |
4577 | trace_debug ("Stack is empty, nothing to return"); | |
4578 | return expr_eval_empty_stack; | |
4579 | } | |
4580 | *rslt = top; | |
4581 | } | |
4582 | return expr_eval_no_error; | |
4583 | ||
4584 | case gdb_agent_op_dup: | |
4585 | stack[sp++] = top; | |
4586 | break; | |
4587 | ||
4588 | case gdb_agent_op_pop: | |
4589 | if (--sp >= 0) | |
4590 | top = stack[sp]; | |
4591 | break; | |
4592 | ||
c7f96d2b TT |
4593 | case gdb_agent_op_pick: |
4594 | arg = aexpr->bytes[pc++]; | |
4595 | stack[sp] = top; | |
4596 | top = stack[sp - arg]; | |
4597 | ++sp; | |
4598 | break; | |
4599 | ||
4600 | case gdb_agent_op_rot: | |
4601 | { | |
4602 | ULONGEST tem = stack[sp - 1]; | |
4603 | ||
4604 | stack[sp - 1] = stack[sp - 2]; | |
4605 | stack[sp - 2] = top; | |
4606 | top = tem; | |
4607 | } | |
4608 | break; | |
4609 | ||
219f2f23 PA |
4610 | case gdb_agent_op_zero_ext: |
4611 | arg = aexpr->bytes[pc++]; | |
4612 | if (arg < (sizeof (LONGEST) * 8)) | |
4613 | top &= ((LONGEST) 1 << arg) - 1; | |
4614 | break; | |
4615 | ||
4616 | case gdb_agent_op_swap: | |
4617 | /* Interchange top two stack elements, making sure top gets | |
4618 | copied back onto stack. */ | |
4619 | stack[sp] = top; | |
4620 | top = stack[sp - 1]; | |
4621 | stack[sp - 1] = stack[sp]; | |
4622 | break; | |
4623 | ||
4624 | case gdb_agent_op_getv: | |
4625 | /* Flush the cached stack top. */ | |
4626 | stack[sp++] = top; | |
4627 | arg = aexpr->bytes[pc++]; | |
4628 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
4629 | top = get_trace_state_variable_value (arg); | |
4630 | break; | |
4631 | ||
4632 | case gdb_agent_op_setv: | |
4633 | arg = aexpr->bytes[pc++]; | |
4634 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
4635 | set_trace_state_variable_value (arg, top); | |
4636 | /* Note that we leave the value on the stack, for the | |
4637 | benefit of later/enclosing expressions. */ | |
4638 | break; | |
4639 | ||
4640 | case gdb_agent_op_tracev: | |
4641 | arg = aexpr->bytes[pc++]; | |
4642 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
4643 | agent_tsv_read (tframe, arg); | |
4644 | break; | |
4645 | ||
4646 | /* GDB never (currently) generates any of these ops. */ | |
4647 | case gdb_agent_op_float: | |
4648 | case gdb_agent_op_ref_float: | |
4649 | case gdb_agent_op_ref_double: | |
4650 | case gdb_agent_op_ref_long_double: | |
4651 | case gdb_agent_op_l_to_d: | |
4652 | case gdb_agent_op_d_to_l: | |
4653 | case gdb_agent_op_trace16: | |
4654 | trace_debug ("Agent expression op 0x%x valid, but not handled", | |
4655 | op); | |
4656 | /* If ever GDB generates any of these, we don't have the | |
4657 | option of ignoring. */ | |
4658 | return 1; | |
4659 | ||
4660 | default: | |
4661 | trace_debug ("Agent expression op 0x%x not recognized", op); | |
4662 | /* Don't struggle on, things will just get worse. */ | |
4663 | return expr_eval_unrecognized_opcode; | |
4664 | } | |
4665 | ||
4666 | /* Check for stack badness. */ | |
4667 | if (sp >= (STACK_MAX - 1)) | |
4668 | { | |
4669 | trace_debug ("Expression stack overflow"); | |
4670 | return expr_eval_stack_overflow; | |
4671 | } | |
4672 | ||
4673 | if (sp < 0) | |
4674 | { | |
4675 | trace_debug ("Expression stack underflow"); | |
4676 | return expr_eval_stack_underflow; | |
4677 | } | |
4678 | ||
4679 | trace_debug ("Op %s -> sp=%d, top=0x%s", | |
94d5e490 | 4680 | gdb_agent_op_name (op), sp, pulongest (top)); |
219f2f23 PA |
4681 | } |
4682 | } | |
4683 | ||
4684 | /* Do memory copies for bytecodes. */ | |
4685 | /* Do the recording of memory blocks for actions and bytecodes. */ | |
4686 | ||
4687 | static int | |
4688 | agent_mem_read (struct traceframe *tframe, | |
4689 | unsigned char *to, CORE_ADDR from, ULONGEST len) | |
4690 | { | |
4691 | unsigned char *mspace; | |
4692 | ULONGEST remaining = len; | |
4693 | unsigned short blocklen; | |
4694 | ||
4695 | /* If a 'to' buffer is specified, use it. */ | |
4696 | if (to != NULL) | |
4697 | { | |
4698 | read_inferior_memory (from, to, len); | |
4699 | return 0; | |
4700 | } | |
4701 | ||
4702 | /* Otherwise, create a new memory block in the trace buffer. */ | |
4703 | while (remaining > 0) | |
4704 | { | |
4705 | size_t sp; | |
4706 | ||
4707 | blocklen = (remaining > 65535 ? 65535 : remaining); | |
4708 | sp = 1 + sizeof (from) + sizeof (blocklen) + blocklen; | |
4709 | mspace = add_traceframe_block (tframe, sp); | |
4710 | if (mspace == NULL) | |
4711 | return 1; | |
4712 | /* Identify block as a memory block. */ | |
4713 | *mspace = 'M'; | |
4714 | ++mspace; | |
4715 | /* Record address and size. */ | |
4716 | memcpy (mspace, &from, sizeof (from)); | |
4717 | mspace += sizeof (from); | |
4718 | memcpy (mspace, &blocklen, sizeof (blocklen)); | |
4719 | mspace += sizeof (blocklen); | |
4720 | /* Record the memory block proper. */ | |
4721 | read_inferior_memory (from, mspace, blocklen); | |
4722 | trace_debug ("%d bytes recorded", blocklen); | |
4723 | remaining -= blocklen; | |
4724 | from += blocklen; | |
4725 | } | |
4726 | return 0; | |
4727 | } | |
4728 | ||
4729 | /* Record the value of a trace state variable. */ | |
4730 | ||
4731 | static int | |
4732 | agent_tsv_read (struct traceframe *tframe, int n) | |
4733 | { | |
4734 | unsigned char *vspace; | |
4735 | LONGEST val; | |
4736 | ||
4737 | vspace = add_traceframe_block (tframe, | |
4738 | 1 + sizeof (n) + sizeof (LONGEST)); | |
4739 | if (vspace == NULL) | |
4740 | return 1; | |
4741 | /* Identify block as a variable. */ | |
4742 | *vspace = 'V'; | |
4743 | /* Record variable's number and value. */ | |
4744 | memcpy (vspace + 1, &n, sizeof (n)); | |
4745 | val = get_trace_state_variable_value (n); | |
4746 | memcpy (vspace + 1 + sizeof (n), &val, sizeof (val)); | |
4747 | trace_debug ("Variable %d recorded", n); | |
4748 | return 0; | |
4749 | } | |
4750 | ||
fa593d66 PA |
4751 | #ifndef IN_PROCESS_AGENT |
4752 | ||
b3b9301e PA |
4753 | /* Callback for traceframe_walk_blocks, used to find a given block |
4754 | type in a traceframe. */ | |
4755 | ||
4756 | static int | |
4757 | match_blocktype (char blocktype, unsigned char *dataptr, void *data) | |
4758 | { | |
4759 | char *wantedp = data; | |
4760 | ||
4761 | if (*wantedp == blocktype) | |
4762 | return 1; | |
4763 | ||
4764 | return 0; | |
4765 | } | |
4766 | ||
4767 | /* Walk over all traceframe blocks of the traceframe buffer starting | |
4768 | at DATABASE, of DATASIZE bytes long, and call CALLBACK for each | |
4769 | block found, passing in DATA unmodified. If CALLBACK returns true, | |
4770 | this returns a pointer to where the block is found. Returns NULL | |
4771 | if no callback call returned true, indicating that all blocks have | |
4772 | been walked. */ | |
4773 | ||
219f2f23 | 4774 | static unsigned char * |
b3b9301e PA |
4775 | traceframe_walk_blocks (unsigned char *database, unsigned int datasize, |
4776 | int tfnum, | |
4777 | int (*callback) (char blocktype, | |
4778 | unsigned char *dataptr, | |
4779 | void *data), | |
4780 | void *data) | |
219f2f23 PA |
4781 | { |
4782 | unsigned char *dataptr; | |
4783 | ||
4784 | if (datasize == 0) | |
4785 | { | |
4786 | trace_debug ("traceframe %d has no data", tfnum); | |
4787 | return NULL; | |
4788 | } | |
4789 | ||
4790 | /* Iterate through a traceframe's blocks, looking for a block of the | |
4791 | requested type. */ | |
4792 | for (dataptr = database; | |
4793 | dataptr < database + datasize; | |
4794 | /* nothing */) | |
4795 | { | |
4796 | char blocktype; | |
4797 | unsigned short mlen; | |
4798 | ||
4799 | if (dataptr == trace_buffer_wrap) | |
4800 | { | |
4801 | /* Adjust to reflect wrapping part of the frame around to | |
4802 | the beginning. */ | |
4803 | datasize = dataptr - database; | |
4804 | dataptr = database = trace_buffer_lo; | |
4805 | } | |
b3b9301e | 4806 | |
219f2f23 PA |
4807 | blocktype = *dataptr++; |
4808 | ||
b3b9301e | 4809 | if ((*callback) (blocktype, dataptr, data)) |
219f2f23 PA |
4810 | return dataptr; |
4811 | ||
4812 | switch (blocktype) | |
4813 | { | |
4814 | case 'R': | |
4815 | /* Skip over the registers block. */ | |
4816 | dataptr += register_cache_size (); | |
4817 | break; | |
4818 | case 'M': | |
4819 | /* Skip over the memory block. */ | |
4820 | dataptr += sizeof (CORE_ADDR); | |
4821 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
4822 | dataptr += (sizeof (mlen) + mlen); | |
4823 | break; | |
219f2f23 PA |
4824 | case 'V': |
4825 | /* Skip over the TSV block. */ | |
4826 | dataptr += (sizeof (int) + sizeof (LONGEST)); | |
4827 | break; | |
0fb4aa4b PA |
4828 | case 'S': |
4829 | /* Skip over the static trace data block. */ | |
4830 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
4831 | dataptr += (sizeof (mlen) + mlen); | |
4832 | break; | |
219f2f23 PA |
4833 | default: |
4834 | trace_debug ("traceframe %d has unknown block type 0x%x", | |
4835 | tfnum, blocktype); | |
4836 | return NULL; | |
4837 | } | |
4838 | } | |
4839 | ||
4840 | return NULL; | |
4841 | } | |
4842 | ||
b3b9301e PA |
4843 | /* Look for the block of type TYPE_WANTED in the trameframe starting |
4844 | at DATABASE of DATASIZE bytes long. TFNUM is the traceframe | |
4845 | number. */ | |
4846 | ||
4847 | static unsigned char * | |
4848 | traceframe_find_block_type (unsigned char *database, unsigned int datasize, | |
4849 | int tfnum, char type_wanted) | |
4850 | { | |
4851 | return traceframe_walk_blocks (database, datasize, tfnum, | |
4852 | match_blocktype, &type_wanted); | |
4853 | } | |
4854 | ||
219f2f23 PA |
4855 | static unsigned char * |
4856 | traceframe_find_regblock (struct traceframe *tframe, int tfnum) | |
4857 | { | |
4858 | unsigned char *regblock; | |
4859 | ||
4860 | regblock = traceframe_find_block_type (tframe->data, | |
4861 | tframe->data_size, | |
4862 | tfnum, 'R'); | |
4863 | ||
4864 | if (regblock == NULL) | |
4865 | trace_debug ("traceframe %d has no register data", tfnum); | |
4866 | ||
4867 | return regblock; | |
4868 | } | |
4869 | ||
4870 | /* Get registers from a traceframe. */ | |
4871 | ||
4872 | int | |
4873 | fetch_traceframe_registers (int tfnum, struct regcache *regcache, int regnum) | |
4874 | { | |
4875 | unsigned char *dataptr; | |
4876 | struct tracepoint *tpoint; | |
4877 | struct traceframe *tframe; | |
4878 | ||
4879 | tframe = find_traceframe (tfnum); | |
4880 | ||
4881 | if (tframe == NULL) | |
4882 | { | |
4883 | trace_debug ("traceframe %d not found", tfnum); | |
4884 | return 1; | |
4885 | } | |
4886 | ||
4887 | dataptr = traceframe_find_regblock (tframe, tfnum); | |
4888 | if (dataptr == NULL) | |
4889 | { | |
1c79eb8a | 4890 | /* Mark registers unavailable. */ |
219f2f23 PA |
4891 | supply_regblock (regcache, NULL); |
4892 | ||
4893 | /* We can generally guess at a PC, although this will be | |
4894 | misleading for while-stepping frames and multi-location | |
4895 | tracepoints. */ | |
4896 | tpoint = find_next_tracepoint_by_number (NULL, tframe->tpnum); | |
4897 | if (tpoint != NULL) | |
4898 | regcache_write_pc (regcache, tpoint->address); | |
4899 | } | |
4900 | else | |
4901 | supply_regblock (regcache, dataptr); | |
4902 | ||
4903 | return 0; | |
4904 | } | |
4905 | ||
4906 | static CORE_ADDR | |
4907 | traceframe_get_pc (struct traceframe *tframe) | |
4908 | { | |
4909 | struct regcache regcache; | |
4910 | unsigned char *dataptr; | |
4911 | ||
4912 | dataptr = traceframe_find_regblock (tframe, -1); | |
4913 | if (dataptr == NULL) | |
4914 | return 0; | |
4915 | ||
4916 | init_register_cache (®cache, dataptr); | |
4917 | return regcache_read_pc (®cache); | |
4918 | } | |
4919 | ||
4920 | /* Read a requested block of memory from a trace frame. */ | |
4921 | ||
4922 | int | |
4923 | traceframe_read_mem (int tfnum, CORE_ADDR addr, | |
4924 | unsigned char *buf, ULONGEST length, | |
4925 | ULONGEST *nbytes) | |
4926 | { | |
4927 | struct traceframe *tframe; | |
4928 | unsigned char *database, *dataptr; | |
4929 | unsigned int datasize; | |
4930 | CORE_ADDR maddr; | |
4931 | unsigned short mlen; | |
4932 | ||
4933 | trace_debug ("traceframe_read_mem"); | |
4934 | ||
4935 | tframe = find_traceframe (tfnum); | |
4936 | ||
4937 | if (!tframe) | |
4938 | { | |
4939 | trace_debug ("traceframe %d not found", tfnum); | |
4940 | return 1; | |
4941 | } | |
4942 | ||
4943 | datasize = tframe->data_size; | |
4944 | database = dataptr = &tframe->data[0]; | |
4945 | ||
4946 | /* Iterate through a traceframe's blocks, looking for memory. */ | |
4947 | while ((dataptr = traceframe_find_block_type (dataptr, | |
493e2a69 MS |
4948 | datasize |
4949 | - (dataptr - database), | |
219f2f23 PA |
4950 | tfnum, 'M')) != NULL) |
4951 | { | |
4952 | memcpy (&maddr, dataptr, sizeof (maddr)); | |
4953 | dataptr += sizeof (maddr); | |
4954 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
4955 | dataptr += sizeof (mlen); | |
4956 | trace_debug ("traceframe %d has %d bytes at %s", | |
4957 | tfnum, mlen, paddress (maddr)); | |
4958 | ||
764880b7 PA |
4959 | /* If the block includes the first part of the desired range, |
4960 | return as much it has; GDB will re-request the remainder, | |
4961 | which might be in a different block of this trace frame. */ | |
4962 | if (maddr <= addr && addr < (maddr + mlen)) | |
219f2f23 | 4963 | { |
764880b7 PA |
4964 | ULONGEST amt = (maddr + mlen) - addr; |
4965 | if (amt > length) | |
4966 | amt = length; | |
4967 | ||
4968 | memcpy (buf, dataptr + (addr - maddr), amt); | |
4969 | *nbytes = amt; | |
219f2f23 PA |
4970 | return 0; |
4971 | } | |
4972 | ||
4973 | /* Skip over this block. */ | |
4974 | dataptr += mlen; | |
4975 | } | |
4976 | ||
4977 | trace_debug ("traceframe %d has no memory data for the desired region", | |
4978 | tfnum); | |
4979 | ||
4980 | *nbytes = 0; | |
4981 | return 0; | |
4982 | } | |
4983 | ||
4984 | static int | |
4985 | traceframe_read_tsv (int tsvnum, LONGEST *val) | |
4986 | { | |
4987 | int tfnum; | |
4988 | struct traceframe *tframe; | |
4989 | unsigned char *database, *dataptr; | |
4990 | unsigned int datasize; | |
4991 | int vnum; | |
4992 | ||
4993 | trace_debug ("traceframe_read_tsv"); | |
4994 | ||
4995 | tfnum = current_traceframe; | |
4996 | ||
4997 | if (tfnum < 0) | |
4998 | { | |
4999 | trace_debug ("no current traceframe"); | |
5000 | return 1; | |
5001 | } | |
5002 | ||
5003 | tframe = find_traceframe (tfnum); | |
5004 | ||
5005 | if (tframe == NULL) | |
5006 | { | |
5007 | trace_debug ("traceframe %d not found", tfnum); | |
5008 | return 1; | |
5009 | } | |
5010 | ||
5011 | datasize = tframe->data_size; | |
5012 | database = dataptr = &tframe->data[0]; | |
5013 | ||
5014 | /* Iterate through a traceframe's blocks, looking for the tsv. */ | |
5015 | while ((dataptr = traceframe_find_block_type (dataptr, | |
493e2a69 MS |
5016 | datasize |
5017 | - (dataptr - database), | |
219f2f23 PA |
5018 | tfnum, 'V')) != NULL) |
5019 | { | |
5020 | memcpy (&vnum, dataptr, sizeof (vnum)); | |
5021 | dataptr += sizeof (vnum); | |
5022 | ||
5023 | trace_debug ("traceframe %d has variable %d", tfnum, vnum); | |
5024 | ||
5025 | /* Check that this is the variable we want. */ | |
5026 | if (tsvnum == vnum) | |
5027 | { | |
5028 | memcpy (val, dataptr, sizeof (*val)); | |
5029 | return 0; | |
5030 | } | |
5031 | ||
5032 | /* Skip over this block. */ | |
5033 | dataptr += sizeof (LONGEST); | |
5034 | } | |
5035 | ||
5036 | trace_debug ("traceframe %d has no data for variable %d", | |
5037 | tfnum, tsvnum); | |
5038 | return 1; | |
5039 | } | |
5040 | ||
0fb4aa4b PA |
5041 | /* Read a requested block of static tracepoint data from a trace |
5042 | frame. */ | |
5043 | ||
5044 | int | |
5045 | traceframe_read_sdata (int tfnum, ULONGEST offset, | |
5046 | unsigned char *buf, ULONGEST length, | |
5047 | ULONGEST *nbytes) | |
5048 | { | |
5049 | struct traceframe *tframe; | |
5050 | unsigned char *database, *dataptr; | |
5051 | unsigned int datasize; | |
5052 | unsigned short mlen; | |
5053 | ||
5054 | trace_debug ("traceframe_read_sdata"); | |
5055 | ||
5056 | tframe = find_traceframe (tfnum); | |
5057 | ||
5058 | if (!tframe) | |
5059 | { | |
5060 | trace_debug ("traceframe %d not found", tfnum); | |
5061 | return 1; | |
5062 | } | |
5063 | ||
5064 | datasize = tframe->data_size; | |
5065 | database = &tframe->data[0]; | |
5066 | ||
5067 | /* Iterate through a traceframe's blocks, looking for static | |
5068 | tracepoint data. */ | |
5069 | dataptr = traceframe_find_block_type (database, datasize, | |
5070 | tfnum, 'S'); | |
5071 | if (dataptr != NULL) | |
5072 | { | |
5073 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5074 | dataptr += sizeof (mlen); | |
5075 | if (offset < mlen) | |
5076 | { | |
5077 | if (offset + length > mlen) | |
5078 | length = mlen - offset; | |
5079 | ||
5080 | memcpy (buf, dataptr, length); | |
5081 | *nbytes = length; | |
5082 | } | |
5083 | else | |
5084 | *nbytes = 0; | |
5085 | return 0; | |
5086 | } | |
5087 | ||
5088 | trace_debug ("traceframe %d has no static trace data", tfnum); | |
5089 | ||
5090 | *nbytes = 0; | |
5091 | return 0; | |
5092 | } | |
5093 | ||
b3b9301e PA |
5094 | /* Callback for traceframe_walk_blocks. Builds a traceframe-info |
5095 | object. DATA is pointer to a struct buffer holding the | |
5096 | traceframe-info object being built. */ | |
5097 | ||
5098 | static int | |
5099 | build_traceframe_info_xml (char blocktype, unsigned char *dataptr, void *data) | |
5100 | { | |
5101 | struct buffer *buffer = data; | |
5102 | ||
5103 | switch (blocktype) | |
5104 | { | |
5105 | case 'M': | |
5106 | { | |
5107 | unsigned short mlen; | |
5108 | CORE_ADDR maddr; | |
5109 | ||
5110 | memcpy (&maddr, dataptr, sizeof (maddr)); | |
5111 | dataptr += sizeof (maddr); | |
5112 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5113 | dataptr += sizeof (mlen); | |
5114 | buffer_xml_printf (buffer, | |
5115 | "<memory start=\"0x%s\" length=\"0x%s\"/>\n", | |
5116 | paddress (maddr), phex_nz (mlen, sizeof (mlen))); | |
5117 | break; | |
5118 | } | |
5119 | case 'V': | |
5120 | case 'R': | |
5121 | case 'S': | |
5122 | { | |
5123 | break; | |
5124 | } | |
5125 | default: | |
5126 | warning ("Unhandled trace block type (%d) '%c ' " | |
5127 | "while building trace frame info.", | |
5128 | blocktype, blocktype); | |
5129 | break; | |
5130 | } | |
5131 | ||
5132 | return 0; | |
5133 | } | |
5134 | ||
5135 | /* Build a traceframe-info object for traceframe number TFNUM into | |
5136 | BUFFER. */ | |
5137 | ||
5138 | int | |
5139 | traceframe_read_info (int tfnum, struct buffer *buffer) | |
5140 | { | |
5141 | struct traceframe *tframe; | |
5142 | ||
5143 | trace_debug ("traceframe_read_info"); | |
5144 | ||
5145 | tframe = find_traceframe (tfnum); | |
5146 | ||
5147 | if (!tframe) | |
5148 | { | |
5149 | trace_debug ("traceframe %d not found", tfnum); | |
5150 | return 1; | |
5151 | } | |
5152 | ||
5153 | buffer_grow_str (buffer, "<traceframe-info>\n"); | |
5154 | traceframe_walk_blocks (tframe->data, tframe->data_size, | |
5155 | tfnum, build_traceframe_info_xml, buffer); | |
5156 | buffer_grow_str0 (buffer, "</traceframe-info>\n"); | |
5157 | return 0; | |
5158 | } | |
5159 | ||
fa593d66 PA |
5160 | /* Return the first fast tracepoint whose jump pad contains PC. */ |
5161 | ||
5162 | static struct tracepoint * | |
5163 | fast_tracepoint_from_jump_pad_address (CORE_ADDR pc) | |
5164 | { | |
5165 | struct tracepoint *tpoint; | |
5166 | ||
5167 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
5168 | if (tpoint->type == fast_tracepoint) | |
5169 | if (tpoint->jump_pad <= pc && pc < tpoint->jump_pad_end) | |
5170 | return tpoint; | |
5171 | ||
5172 | return NULL; | |
5173 | } | |
5174 | ||
5175 | /* Return GDBserver's tracepoint that matches the IP Agent's | |
5176 | tracepoint object that lives at IPA_TPOINT_OBJ in the IP Agent's | |
5177 | address space. */ | |
5178 | ||
5179 | static struct tracepoint * | |
5180 | fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR ipa_tpoint_obj) | |
5181 | { | |
5182 | struct tracepoint *tpoint; | |
5183 | ||
5184 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
5185 | if (tpoint->type == fast_tracepoint) | |
5186 | if (tpoint->obj_addr_on_target == ipa_tpoint_obj) | |
5187 | return tpoint; | |
5188 | ||
5189 | return NULL; | |
5190 | } | |
5191 | ||
5192 | #endif | |
5193 | ||
5194 | /* The type of the object that is used to synchronize fast tracepoint | |
5195 | collection. */ | |
5196 | ||
5197 | typedef struct collecting_t | |
5198 | { | |
5199 | /* The fast tracepoint number currently collecting. */ | |
5200 | uintptr_t tpoint; | |
5201 | ||
5202 | /* A number that GDBserver can use to identify the thread that is | |
5203 | presently holding the collect lock. This need not (and usually | |
5204 | is not) the thread id, as getting the current thread ID usually | |
5205 | requires a system call, which we want to avoid like the plague. | |
5206 | Usually this is thread's TCB, found in the TLS (pseudo-) | |
5207 | register, which is readable with a single insn on several | |
5208 | architectures. */ | |
5209 | uintptr_t thread_area; | |
5210 | } collecting_t; | |
5211 | ||
5212 | #ifndef IN_PROCESS_AGENT | |
5213 | ||
5214 | void | |
5215 | force_unlock_trace_buffer (void) | |
5216 | { | |
5217 | write_inferior_data_pointer (ipa_sym_addrs.addr_collecting, 0); | |
5218 | } | |
5219 | ||
5220 | /* Check if the thread identified by THREAD_AREA which is stopped at | |
5221 | STOP_PC, is presently locking the fast tracepoint collection, and | |
5222 | if so, gather some status of said collection. Returns 0 if the | |
5223 | thread isn't collecting or in the jump pad at all. 1, if in the | |
5224 | jump pad (or within gdb_collect) and hasn't executed the adjusted | |
5225 | original insn yet (can set a breakpoint there and run to it). 2, | |
5226 | if presently executing the adjusted original insn --- in which | |
5227 | case, if we want to move the thread out of the jump pad, we need to | |
5228 | single-step it until this function returns 0. */ | |
5229 | ||
5230 | int | |
5231 | fast_tracepoint_collecting (CORE_ADDR thread_area, | |
5232 | CORE_ADDR stop_pc, | |
5233 | struct fast_tpoint_collect_status *status) | |
5234 | { | |
5235 | CORE_ADDR ipa_collecting; | |
5236 | CORE_ADDR ipa_gdb_jump_pad_buffer, ipa_gdb_jump_pad_buffer_end; | |
5237 | struct tracepoint *tpoint; | |
5238 | int needs_breakpoint; | |
5239 | ||
5240 | /* The thread THREAD_AREA is either: | |
5241 | ||
5242 | 0. not collecting at all, not within the jump pad, or within | |
5243 | gdb_collect or one of its callees. | |
5244 | ||
5245 | 1. in the jump pad and haven't reached gdb_collect | |
5246 | ||
5247 | 2. within gdb_collect (out of the jump pad) (collect is set) | |
5248 | ||
5249 | 3. we're in the jump pad, after gdb_collect having returned, | |
5250 | possibly executing the adjusted insns. | |
5251 | ||
5252 | For cases 1 and 3, `collecting' may or not be set. The jump pad | |
5253 | doesn't have any complicated jump logic, so we can tell if the | |
5254 | thread is executing the adjust original insn or not by just | |
5255 | matching STOP_PC with known jump pad addresses. If we it isn't | |
5256 | yet executing the original insn, set a breakpoint there, and let | |
5257 | the thread run to it, so to quickly step over a possible (many | |
5258 | insns) gdb_collect call. Otherwise, or when the breakpoint is | |
5259 | hit, only a few (small number of) insns are left to be executed | |
5260 | in the jump pad. Single-step the thread until it leaves the | |
5261 | jump pad. */ | |
5262 | ||
5263 | again: | |
5264 | tpoint = NULL; | |
5265 | needs_breakpoint = 0; | |
5266 | trace_debug ("fast_tracepoint_collecting"); | |
5267 | ||
5268 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer, | |
5269 | &ipa_gdb_jump_pad_buffer)) | |
5270 | fatal ("error extracting `gdb_jump_pad_buffer'"); | |
5271 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer_end, | |
5272 | &ipa_gdb_jump_pad_buffer_end)) | |
5273 | fatal ("error extracting `gdb_jump_pad_buffer_end'"); | |
5274 | ||
493e2a69 MS |
5275 | if (ipa_gdb_jump_pad_buffer <= stop_pc |
5276 | && stop_pc < ipa_gdb_jump_pad_buffer_end) | |
fa593d66 PA |
5277 | { |
5278 | /* We can tell which tracepoint(s) the thread is collecting by | |
5279 | matching the jump pad address back to the tracepoint. */ | |
5280 | tpoint = fast_tracepoint_from_jump_pad_address (stop_pc); | |
5281 | if (tpoint == NULL) | |
5282 | { | |
5283 | warning ("in jump pad, but no matching tpoint?"); | |
5284 | return 0; | |
5285 | } | |
5286 | else | |
5287 | { | |
5288 | trace_debug ("in jump pad of tpoint (%d, %s); jump_pad(%s, %s); " | |
5289 | "adj_insn(%s, %s)", | |
5290 | tpoint->number, paddress (tpoint->address), | |
5291 | paddress (tpoint->jump_pad), | |
5292 | paddress (tpoint->jump_pad_end), | |
5293 | paddress (tpoint->adjusted_insn_addr), | |
5294 | paddress (tpoint->adjusted_insn_addr_end)); | |
5295 | } | |
5296 | ||
5297 | /* Definitely in the jump pad. May or may not need | |
5298 | fast-exit-jump-pad breakpoint. */ | |
5299 | if (tpoint->jump_pad <= stop_pc | |
5300 | && stop_pc < tpoint->adjusted_insn_addr) | |
5301 | needs_breakpoint = 1; | |
5302 | } | |
5303 | else | |
5304 | { | |
5305 | collecting_t ipa_collecting_obj; | |
5306 | ||
5307 | /* If `collecting' is set/locked, then the THREAD_AREA thread | |
5308 | may or not be the one holding the lock. We have to read the | |
5309 | lock to find out. */ | |
5310 | ||
5311 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_collecting, | |
5312 | &ipa_collecting)) | |
5313 | { | |
5314 | trace_debug ("fast_tracepoint_collecting:" | |
5315 | " failed reading 'collecting' in the inferior"); | |
5316 | return 0; | |
5317 | } | |
5318 | ||
5319 | if (!ipa_collecting) | |
5320 | { | |
5321 | trace_debug ("fast_tracepoint_collecting: not collecting" | |
5322 | " (and nobody is)."); | |
5323 | return 0; | |
5324 | } | |
5325 | ||
5326 | /* Some thread is collecting. Check which. */ | |
5327 | if (read_inferior_memory (ipa_collecting, | |
5328 | (unsigned char *) &ipa_collecting_obj, | |
5329 | sizeof (ipa_collecting_obj)) != 0) | |
5330 | goto again; | |
5331 | ||
5332 | if (ipa_collecting_obj.thread_area != thread_area) | |
5333 | { | |
5334 | trace_debug ("fast_tracepoint_collecting: not collecting " | |
5335 | "(another thread is)"); | |
5336 | return 0; | |
5337 | } | |
5338 | ||
5339 | tpoint | |
5340 | = fast_tracepoint_from_ipa_tpoint_address (ipa_collecting_obj.tpoint); | |
5341 | if (tpoint == NULL) | |
5342 | { | |
5343 | warning ("fast_tracepoint_collecting: collecting, " | |
5344 | "but tpoint %s not found?", | |
5345 | paddress ((CORE_ADDR) ipa_collecting_obj.tpoint)); | |
5346 | return 0; | |
5347 | } | |
5348 | ||
5349 | /* The thread is within `gdb_collect', skip over the rest of | |
5350 | fast tracepoint collection quickly using a breakpoint. */ | |
5351 | needs_breakpoint = 1; | |
5352 | } | |
5353 | ||
5354 | /* The caller wants a bit of status detail. */ | |
5355 | if (status != NULL) | |
5356 | { | |
5357 | status->tpoint_num = tpoint->number; | |
5358 | status->tpoint_addr = tpoint->address; | |
5359 | status->adjusted_insn_addr = tpoint->adjusted_insn_addr; | |
5360 | status->adjusted_insn_addr_end = tpoint->adjusted_insn_addr_end; | |
5361 | } | |
5362 | ||
5363 | if (needs_breakpoint) | |
5364 | { | |
5365 | /* Hasn't executed the original instruction yet. Set breakpoint | |
5366 | there, and wait till it's hit, then single-step until exiting | |
5367 | the jump pad. */ | |
5368 | ||
5369 | trace_debug ("\ | |
5370 | fast_tracepoint_collecting, returning continue-until-break at %s", | |
5371 | paddress (tpoint->adjusted_insn_addr)); | |
5372 | ||
5373 | return 1; /* continue */ | |
5374 | } | |
5375 | else | |
5376 | { | |
5377 | /* Just single-step until exiting the jump pad. */ | |
5378 | ||
5379 | trace_debug ("fast_tracepoint_collecting, returning " | |
5380 | "need-single-step (%s-%s)", | |
5381 | paddress (tpoint->adjusted_insn_addr), | |
5382 | paddress (tpoint->adjusted_insn_addr_end)); | |
5383 | ||
5384 | return 2; /* single-step */ | |
5385 | } | |
5386 | } | |
5387 | ||
5388 | #endif | |
5389 | ||
5390 | #ifdef IN_PROCESS_AGENT | |
5391 | ||
5392 | /* The global fast tracepoint collect lock. Points to a collecting_t | |
5393 | object built on the stack by the jump pad, if presently locked; | |
5394 | NULL if it isn't locked. Note that this lock *must* be set while | |
5395 | executing any *function other than the jump pad. See | |
5396 | fast_tracepoint_collecting. */ | |
5397 | static collecting_t * ATTR_USED collecting; | |
5398 | ||
5399 | /* This routine, called from the jump pad (in asm) is designed to be | |
5400 | called from the jump pads of fast tracepoints, thus it is on the | |
5401 | critical path. */ | |
5402 | ||
5403 | IP_AGENT_EXPORT void ATTR_USED | |
5404 | gdb_collect (struct tracepoint *tpoint, unsigned char *regs) | |
5405 | { | |
5406 | struct fast_tracepoint_ctx ctx; | |
5407 | ||
5408 | /* Don't do anything until the trace run is completely set up. */ | |
5409 | if (!tracing) | |
5410 | return; | |
5411 | ||
d248b706 KY |
5412 | if (!tpoint->enabled) |
5413 | return; | |
5414 | ||
fa593d66 PA |
5415 | ctx.base.type = fast_tracepoint; |
5416 | ctx.regs = regs; | |
5417 | ctx.regcache_initted = 0; | |
5418 | ctx.tpoint = tpoint; | |
5419 | ||
5420 | /* Wrap the regblock in a register cache (in the stack, we don't | |
5421 | want to malloc here). */ | |
5422 | ctx.regspace = alloca (register_cache_size ()); | |
5423 | if (ctx.regspace == NULL) | |
5424 | { | |
5425 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
5426 | return; | |
5427 | } | |
5428 | ||
5429 | /* Test the condition if present, and collect if true. */ | |
5430 | if (tpoint->cond == NULL | |
5431 | || condition_true_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
5432 | tpoint)) | |
5433 | { | |
5434 | collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
5435 | tpoint->address, tpoint); | |
5436 | ||
5437 | /* Note that this will cause original insns to be written back | |
5438 | to where we jumped from, but that's OK because we're jumping | |
5439 | back to the next whole instruction. This will go badly if | |
5440 | instruction restoration is not atomic though. */ | |
5441 | if (stopping_tracepoint | |
5442 | || trace_buffer_is_full | |
5443 | || expr_eval_result != expr_eval_no_error) | |
5444 | stop_tracing (); | |
5445 | } | |
5446 | else | |
5447 | { | |
5448 | /* If there was a condition and it evaluated to false, the only | |
5449 | way we would stop tracing is if there was an error during | |
5450 | condition expression evaluation. */ | |
5451 | if (expr_eval_result != expr_eval_no_error) | |
5452 | stop_tracing (); | |
5453 | } | |
5454 | } | |
5455 | ||
5456 | #endif | |
5457 | ||
5458 | #ifndef IN_PROCESS_AGENT | |
5459 | ||
6a271cae PA |
5460 | /* Bytecode compilation. */ |
5461 | ||
5462 | CORE_ADDR current_insn_ptr; | |
5463 | ||
5464 | int emit_error; | |
5465 | ||
5466 | struct bytecode_address | |
5467 | { | |
5468 | int pc; | |
5469 | CORE_ADDR address; | |
5470 | int goto_pc; | |
5471 | /* Offset and size of field to be modified in the goto block. */ | |
5472 | int from_offset, from_size; | |
5473 | struct bytecode_address *next; | |
5474 | } *bytecode_address_table; | |
5475 | ||
5476 | CORE_ADDR | |
5477 | get_raw_reg_func_addr (void) | |
5478 | { | |
5479 | return ipa_sym_addrs.addr_get_raw_reg; | |
5480 | } | |
5481 | ||
5482 | static void | |
5483 | emit_prologue (void) | |
5484 | { | |
5485 | target_emit_ops ()->emit_prologue (); | |
5486 | } | |
5487 | ||
5488 | static void | |
5489 | emit_epilogue (void) | |
5490 | { | |
5491 | target_emit_ops ()->emit_epilogue (); | |
5492 | } | |
5493 | ||
5494 | static void | |
5495 | emit_add (void) | |
5496 | { | |
5497 | target_emit_ops ()->emit_add (); | |
5498 | } | |
5499 | ||
5500 | static void | |
5501 | emit_sub (void) | |
5502 | { | |
5503 | target_emit_ops ()->emit_sub (); | |
5504 | } | |
5505 | ||
5506 | static void | |
5507 | emit_mul (void) | |
5508 | { | |
5509 | target_emit_ops ()->emit_mul (); | |
5510 | } | |
5511 | ||
5512 | static void | |
5513 | emit_lsh (void) | |
5514 | { | |
5515 | target_emit_ops ()->emit_lsh (); | |
5516 | } | |
5517 | ||
5518 | static void | |
5519 | emit_rsh_signed (void) | |
5520 | { | |
5521 | target_emit_ops ()->emit_rsh_signed (); | |
5522 | } | |
5523 | ||
5524 | static void | |
5525 | emit_rsh_unsigned (void) | |
5526 | { | |
5527 | target_emit_ops ()->emit_rsh_unsigned (); | |
5528 | } | |
5529 | ||
5530 | static void | |
5531 | emit_ext (int arg) | |
5532 | { | |
5533 | target_emit_ops ()->emit_ext (arg); | |
5534 | } | |
5535 | ||
5536 | static void | |
5537 | emit_log_not (void) | |
5538 | { | |
5539 | target_emit_ops ()->emit_log_not (); | |
5540 | } | |
5541 | ||
5542 | static void | |
5543 | emit_bit_and (void) | |
5544 | { | |
5545 | target_emit_ops ()->emit_bit_and (); | |
5546 | } | |
5547 | ||
5548 | static void | |
5549 | emit_bit_or (void) | |
5550 | { | |
5551 | target_emit_ops ()->emit_bit_or (); | |
5552 | } | |
5553 | ||
5554 | static void | |
5555 | emit_bit_xor (void) | |
5556 | { | |
5557 | target_emit_ops ()->emit_bit_xor (); | |
5558 | } | |
5559 | ||
5560 | static void | |
5561 | emit_bit_not (void) | |
5562 | { | |
5563 | target_emit_ops ()->emit_bit_not (); | |
5564 | } | |
5565 | ||
5566 | static void | |
5567 | emit_equal (void) | |
5568 | { | |
5569 | target_emit_ops ()->emit_equal (); | |
5570 | } | |
5571 | ||
5572 | static void | |
5573 | emit_less_signed (void) | |
5574 | { | |
5575 | target_emit_ops ()->emit_less_signed (); | |
5576 | } | |
5577 | ||
5578 | static void | |
5579 | emit_less_unsigned (void) | |
5580 | { | |
5581 | target_emit_ops ()->emit_less_unsigned (); | |
5582 | } | |
5583 | ||
5584 | static void | |
5585 | emit_ref (int size) | |
5586 | { | |
5587 | target_emit_ops ()->emit_ref (size); | |
5588 | } | |
5589 | ||
5590 | static void | |
5591 | emit_if_goto (int *offset_p, int *size_p) | |
5592 | { | |
5593 | target_emit_ops ()->emit_if_goto (offset_p, size_p); | |
5594 | } | |
5595 | ||
5596 | static void | |
5597 | emit_goto (int *offset_p, int *size_p) | |
5598 | { | |
5599 | target_emit_ops ()->emit_goto (offset_p, size_p); | |
5600 | } | |
5601 | ||
5602 | static void | |
5603 | write_goto_address (CORE_ADDR from, CORE_ADDR to, int size) | |
5604 | { | |
5605 | target_emit_ops ()->write_goto_address (from, to, size); | |
5606 | } | |
5607 | ||
5608 | static void | |
4e29fb54 | 5609 | emit_const (LONGEST num) |
6a271cae PA |
5610 | { |
5611 | target_emit_ops ()->emit_const (num); | |
5612 | } | |
5613 | ||
5614 | static void | |
5615 | emit_reg (int reg) | |
5616 | { | |
5617 | target_emit_ops ()->emit_reg (reg); | |
5618 | } | |
5619 | ||
5620 | static void | |
5621 | emit_pop (void) | |
5622 | { | |
5623 | target_emit_ops ()->emit_pop (); | |
5624 | } | |
5625 | ||
5626 | static void | |
5627 | emit_stack_flush (void) | |
5628 | { | |
5629 | target_emit_ops ()->emit_stack_flush (); | |
5630 | } | |
5631 | ||
5632 | static void | |
5633 | emit_zero_ext (int arg) | |
5634 | { | |
5635 | target_emit_ops ()->emit_zero_ext (arg); | |
5636 | } | |
5637 | ||
5638 | static void | |
5639 | emit_swap (void) | |
5640 | { | |
5641 | target_emit_ops ()->emit_swap (); | |
5642 | } | |
5643 | ||
5644 | static void | |
5645 | emit_stack_adjust (int n) | |
5646 | { | |
5647 | target_emit_ops ()->emit_stack_adjust (n); | |
5648 | } | |
5649 | ||
5650 | /* FN's prototype is `LONGEST(*fn)(int)'. */ | |
5651 | ||
5652 | static void | |
5653 | emit_int_call_1 (CORE_ADDR fn, int arg1) | |
5654 | { | |
5655 | target_emit_ops ()->emit_int_call_1 (fn, arg1); | |
5656 | } | |
5657 | ||
4e29fb54 | 5658 | /* FN's prototype is `void(*fn)(int,LONGEST)'. */ |
6a271cae PA |
5659 | |
5660 | static void | |
5661 | emit_void_call_2 (CORE_ADDR fn, int arg1) | |
5662 | { | |
5663 | target_emit_ops ()->emit_void_call_2 (fn, arg1); | |
5664 | } | |
5665 | ||
5666 | static enum eval_result_type compile_bytecodes (struct agent_expr *aexpr); | |
5667 | ||
5668 | static void | |
493e2a69 MS |
5669 | compile_tracepoint_condition (struct tracepoint *tpoint, |
5670 | CORE_ADDR *jump_entry) | |
6a271cae PA |
5671 | { |
5672 | CORE_ADDR entry_point = *jump_entry; | |
5673 | enum eval_result_type err; | |
5674 | ||
5675 | trace_debug ("Starting condition compilation for tracepoint %d\n", | |
5676 | tpoint->number); | |
5677 | ||
5678 | /* Initialize the global pointer to the code being built. */ | |
5679 | current_insn_ptr = *jump_entry; | |
5680 | ||
5681 | emit_prologue (); | |
5682 | ||
5683 | err = compile_bytecodes (tpoint->cond); | |
5684 | ||
5685 | if (err == expr_eval_no_error) | |
5686 | { | |
5687 | emit_epilogue (); | |
5688 | ||
5689 | /* Record the beginning of the compiled code. */ | |
5690 | tpoint->compiled_cond = entry_point; | |
5691 | ||
5692 | trace_debug ("Condition compilation for tracepoint %d complete\n", | |
5693 | tpoint->number); | |
5694 | } | |
5695 | else | |
5696 | { | |
5697 | /* Leave the unfinished code in situ, but don't point to it. */ | |
5698 | ||
5699 | tpoint->compiled_cond = 0; | |
5700 | ||
5701 | trace_debug ("Condition compilation for tracepoint %d failed, " | |
5702 | "error code %d", | |
5703 | tpoint->number, err); | |
5704 | } | |
5705 | ||
5706 | /* Update the code pointer passed in. Note that we do this even if | |
5707 | the compile fails, so that we can look at the partial results | |
5708 | instead of letting them be overwritten. */ | |
5709 | *jump_entry = current_insn_ptr; | |
5710 | ||
5711 | /* Leave a gap, to aid dump decipherment. */ | |
5712 | *jump_entry += 16; | |
5713 | } | |
5714 | ||
5715 | /* Given an agent expression, turn it into native code. */ | |
5716 | ||
5717 | static enum eval_result_type | |
5718 | compile_bytecodes (struct agent_expr *aexpr) | |
5719 | { | |
5720 | int pc = 0; | |
5721 | int done = 0; | |
5722 | unsigned char op; | |
5723 | int arg; | |
5724 | /* This is only used to build 64-bit value for constants. */ | |
5725 | ULONGEST top; | |
5726 | struct bytecode_address *aentry, *aentry2; | |
5727 | ||
5728 | #define UNHANDLED \ | |
5729 | do \ | |
5730 | { \ | |
5731 | trace_debug ("Cannot compile op 0x%x\n", op); \ | |
5732 | return expr_eval_unhandled_opcode; \ | |
5733 | } while (0) | |
5734 | ||
5735 | if (aexpr->length == 0) | |
5736 | { | |
5737 | trace_debug ("empty agent expression\n"); | |
5738 | return expr_eval_empty_expression; | |
5739 | } | |
5740 | ||
5741 | bytecode_address_table = NULL; | |
5742 | ||
5743 | while (!done) | |
5744 | { | |
5745 | op = aexpr->bytes[pc]; | |
5746 | ||
5747 | trace_debug ("About to compile op 0x%x, pc=%d\n", op, pc); | |
5748 | ||
5749 | /* Record the compiled-code address of the bytecode, for use by | |
5750 | jump instructions. */ | |
5751 | aentry = xmalloc (sizeof (struct bytecode_address)); | |
5752 | aentry->pc = pc; | |
5753 | aentry->address = current_insn_ptr; | |
5754 | aentry->goto_pc = -1; | |
5755 | aentry->from_offset = aentry->from_size = 0; | |
5756 | aentry->next = bytecode_address_table; | |
5757 | bytecode_address_table = aentry; | |
5758 | ||
5759 | ++pc; | |
5760 | ||
5761 | emit_error = 0; | |
5762 | ||
5763 | switch (op) | |
5764 | { | |
5765 | case gdb_agent_op_add: | |
5766 | emit_add (); | |
5767 | break; | |
5768 | ||
5769 | case gdb_agent_op_sub: | |
5770 | emit_sub (); | |
5771 | break; | |
5772 | ||
5773 | case gdb_agent_op_mul: | |
5774 | emit_mul (); | |
5775 | break; | |
5776 | ||
5777 | case gdb_agent_op_div_signed: | |
5778 | UNHANDLED; | |
5779 | break; | |
5780 | ||
5781 | case gdb_agent_op_div_unsigned: | |
5782 | UNHANDLED; | |
5783 | break; | |
5784 | ||
5785 | case gdb_agent_op_rem_signed: | |
5786 | UNHANDLED; | |
5787 | break; | |
5788 | ||
5789 | case gdb_agent_op_rem_unsigned: | |
5790 | UNHANDLED; | |
5791 | break; | |
5792 | ||
5793 | case gdb_agent_op_lsh: | |
5794 | emit_lsh (); | |
5795 | break; | |
5796 | ||
5797 | case gdb_agent_op_rsh_signed: | |
5798 | emit_rsh_signed (); | |
5799 | break; | |
5800 | ||
5801 | case gdb_agent_op_rsh_unsigned: | |
5802 | emit_rsh_unsigned (); | |
5803 | break; | |
5804 | ||
5805 | case gdb_agent_op_trace: | |
5806 | UNHANDLED; | |
5807 | break; | |
5808 | ||
5809 | case gdb_agent_op_trace_quick: | |
5810 | UNHANDLED; | |
5811 | break; | |
5812 | ||
5813 | case gdb_agent_op_log_not: | |
5814 | emit_log_not (); | |
5815 | break; | |
5816 | ||
5817 | case gdb_agent_op_bit_and: | |
5818 | emit_bit_and (); | |
5819 | break; | |
5820 | ||
5821 | case gdb_agent_op_bit_or: | |
5822 | emit_bit_or (); | |
5823 | break; | |
5824 | ||
5825 | case gdb_agent_op_bit_xor: | |
5826 | emit_bit_xor (); | |
5827 | break; | |
5828 | ||
5829 | case gdb_agent_op_bit_not: | |
5830 | emit_bit_not (); | |
5831 | break; | |
5832 | ||
5833 | case gdb_agent_op_equal: | |
5834 | emit_equal (); | |
5835 | break; | |
5836 | ||
5837 | case gdb_agent_op_less_signed: | |
5838 | emit_less_signed (); | |
5839 | break; | |
5840 | ||
5841 | case gdb_agent_op_less_unsigned: | |
5842 | emit_less_unsigned (); | |
5843 | break; | |
5844 | ||
5845 | case gdb_agent_op_ext: | |
5846 | arg = aexpr->bytes[pc++]; | |
5847 | if (arg < (sizeof (LONGEST) * 8)) | |
5848 | emit_ext (arg); | |
5849 | break; | |
5850 | ||
5851 | case gdb_agent_op_ref8: | |
5852 | emit_ref (1); | |
5853 | break; | |
5854 | ||
5855 | case gdb_agent_op_ref16: | |
5856 | emit_ref (2); | |
5857 | break; | |
5858 | ||
5859 | case gdb_agent_op_ref32: | |
5860 | emit_ref (4); | |
5861 | break; | |
5862 | ||
5863 | case gdb_agent_op_ref64: | |
5864 | emit_ref (8); | |
5865 | break; | |
5866 | ||
5867 | case gdb_agent_op_if_goto: | |
5868 | arg = aexpr->bytes[pc++]; | |
5869 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
5870 | aentry->goto_pc = arg; | |
5871 | emit_if_goto (&(aentry->from_offset), &(aentry->from_size)); | |
5872 | break; | |
5873 | ||
5874 | case gdb_agent_op_goto: | |
5875 | arg = aexpr->bytes[pc++]; | |
5876 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
5877 | aentry->goto_pc = arg; | |
5878 | emit_goto (&(aentry->from_offset), &(aentry->from_size)); | |
5879 | break; | |
5880 | ||
5881 | case gdb_agent_op_const8: | |
5882 | emit_stack_flush (); | |
5883 | top = aexpr->bytes[pc++]; | |
5884 | emit_const (top); | |
5885 | break; | |
5886 | ||
5887 | case gdb_agent_op_const16: | |
5888 | emit_stack_flush (); | |
5889 | top = aexpr->bytes[pc++]; | |
5890 | top = (top << 8) + aexpr->bytes[pc++]; | |
5891 | emit_const (top); | |
5892 | break; | |
5893 | ||
5894 | case gdb_agent_op_const32: | |
5895 | emit_stack_flush (); | |
5896 | top = aexpr->bytes[pc++]; | |
5897 | top = (top << 8) + aexpr->bytes[pc++]; | |
5898 | top = (top << 8) + aexpr->bytes[pc++]; | |
5899 | top = (top << 8) + aexpr->bytes[pc++]; | |
5900 | emit_const (top); | |
5901 | break; | |
5902 | ||
5903 | case gdb_agent_op_const64: | |
5904 | emit_stack_flush (); | |
5905 | top = aexpr->bytes[pc++]; | |
5906 | top = (top << 8) + aexpr->bytes[pc++]; | |
5907 | top = (top << 8) + aexpr->bytes[pc++]; | |
5908 | top = (top << 8) + aexpr->bytes[pc++]; | |
5909 | top = (top << 8) + aexpr->bytes[pc++]; | |
5910 | top = (top << 8) + aexpr->bytes[pc++]; | |
5911 | top = (top << 8) + aexpr->bytes[pc++]; | |
5912 | top = (top << 8) + aexpr->bytes[pc++]; | |
5913 | emit_const (top); | |
5914 | break; | |
5915 | ||
5916 | case gdb_agent_op_reg: | |
5917 | emit_stack_flush (); | |
5918 | arg = aexpr->bytes[pc++]; | |
5919 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
5920 | emit_reg (arg); | |
5921 | break; | |
5922 | ||
5923 | case gdb_agent_op_end: | |
5924 | trace_debug ("At end of expression\n"); | |
5925 | ||
5926 | /* Assume there is one stack element left, and that it is | |
5927 | cached in "top" where emit_epilogue can get to it. */ | |
5928 | emit_stack_adjust (1); | |
5929 | ||
5930 | done = 1; | |
5931 | break; | |
5932 | ||
5933 | case gdb_agent_op_dup: | |
5934 | /* In our design, dup is equivalent to stack flushing. */ | |
5935 | emit_stack_flush (); | |
5936 | break; | |
5937 | ||
5938 | case gdb_agent_op_pop: | |
5939 | emit_pop (); | |
5940 | break; | |
5941 | ||
5942 | case gdb_agent_op_zero_ext: | |
5943 | arg = aexpr->bytes[pc++]; | |
5944 | if (arg < (sizeof (LONGEST) * 8)) | |
5945 | emit_zero_ext (arg); | |
5946 | break; | |
5947 | ||
5948 | case gdb_agent_op_swap: | |
5949 | emit_swap (); | |
5950 | break; | |
5951 | ||
5952 | case gdb_agent_op_getv: | |
5953 | emit_stack_flush (); | |
5954 | arg = aexpr->bytes[pc++]; | |
5955 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
5956 | emit_int_call_1 (ipa_sym_addrs.addr_get_trace_state_variable_value, | |
5957 | arg); | |
5958 | break; | |
5959 | ||
5960 | case gdb_agent_op_setv: | |
5961 | arg = aexpr->bytes[pc++]; | |
5962 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
5963 | emit_void_call_2 (ipa_sym_addrs.addr_set_trace_state_variable_value, | |
5964 | arg); | |
5965 | break; | |
5966 | ||
5967 | case gdb_agent_op_tracev: | |
5968 | UNHANDLED; | |
5969 | break; | |
5970 | ||
5971 | /* GDB never (currently) generates any of these ops. */ | |
5972 | case gdb_agent_op_float: | |
5973 | case gdb_agent_op_ref_float: | |
5974 | case gdb_agent_op_ref_double: | |
5975 | case gdb_agent_op_ref_long_double: | |
5976 | case gdb_agent_op_l_to_d: | |
5977 | case gdb_agent_op_d_to_l: | |
5978 | case gdb_agent_op_trace16: | |
5979 | UNHANDLED; | |
5980 | break; | |
5981 | ||
5982 | default: | |
5983 | trace_debug ("Agent expression op 0x%x not recognized\n", op); | |
5984 | /* Don't struggle on, things will just get worse. */ | |
5985 | return expr_eval_unrecognized_opcode; | |
5986 | } | |
5987 | ||
5988 | /* This catches errors that occur in target-specific code | |
5989 | emission. */ | |
5990 | if (emit_error) | |
5991 | { | |
5992 | trace_debug ("Error %d while emitting code for %s\n", | |
94d5e490 | 5993 | emit_error, gdb_agent_op_name (op)); |
6a271cae PA |
5994 | return expr_eval_unhandled_opcode; |
5995 | } | |
5996 | ||
94d5e490 | 5997 | trace_debug ("Op %s compiled\n", gdb_agent_op_name (op)); |
6a271cae PA |
5998 | } |
5999 | ||
6000 | /* Now fill in real addresses as goto destinations. */ | |
6001 | for (aentry = bytecode_address_table; aentry; aentry = aentry->next) | |
6002 | { | |
6003 | int written = 0; | |
6004 | ||
6005 | if (aentry->goto_pc < 0) | |
6006 | continue; | |
6007 | ||
6008 | /* Find the location that we are going to, and call back into | |
6009 | target-specific code to write the actual address or | |
6010 | displacement. */ | |
6011 | for (aentry2 = bytecode_address_table; aentry2; aentry2 = aentry2->next) | |
6012 | { | |
6013 | if (aentry2->pc == aentry->goto_pc) | |
6014 | { | |
6015 | trace_debug ("Want to jump from %s to %s\n", | |
6016 | paddress (aentry->address), | |
6017 | paddress (aentry2->address)); | |
6018 | write_goto_address (aentry->address + aentry->from_offset, | |
6019 | aentry2->address, aentry->from_size); | |
6020 | written = 1; | |
6021 | break; | |
6022 | } | |
6023 | } | |
6024 | ||
6025 | /* Error out if we didn't find a destination. */ | |
6026 | if (!written) | |
6027 | { | |
6028 | trace_debug ("Destination of goto %d not found\n", | |
6029 | aentry->goto_pc); | |
6030 | return expr_eval_invalid_goto; | |
6031 | } | |
6032 | } | |
6033 | ||
6034 | return expr_eval_no_error; | |
6035 | } | |
6036 | ||
fa593d66 PA |
6037 | /* We'll need to adjust these when we consider bi-arch setups, and big |
6038 | endian machines. */ | |
6039 | ||
6040 | static int | |
6041 | write_inferior_data_ptr (CORE_ADDR where, CORE_ADDR ptr) | |
6042 | { | |
6043 | return write_inferior_memory (where, | |
6044 | (unsigned char *) &ptr, sizeof (void *)); | |
6045 | } | |
6046 | ||
6047 | /* The base pointer of the IPA's heap. This is the only memory the | |
6048 | IPA is allowed to use. The IPA should _not_ call the inferior's | |
6049 | `malloc' during operation. That'd be slow, and, most importantly, | |
6050 | it may not be safe. We may be collecting a tracepoint in a signal | |
6051 | handler, for example. */ | |
6052 | static CORE_ADDR target_tp_heap; | |
6053 | ||
6054 | /* Allocate at least SIZE bytes of memory from the IPA heap, aligned | |
6055 | to 8 bytes. */ | |
6056 | ||
6057 | static CORE_ADDR | |
6058 | target_malloc (ULONGEST size) | |
6059 | { | |
6060 | CORE_ADDR ptr; | |
6061 | ||
6062 | if (target_tp_heap == 0) | |
6063 | { | |
6064 | /* We have the pointer *address*, need what it points to. */ | |
6065 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_tp_heap_buffer, | |
6066 | &target_tp_heap)) | |
6067 | fatal ("could get target heap head pointer"); | |
6068 | } | |
6069 | ||
6070 | ptr = target_tp_heap; | |
6071 | target_tp_heap += size; | |
6072 | ||
6073 | /* Pad to 8-byte alignment. */ | |
6074 | target_tp_heap = ((target_tp_heap + 7) & ~0x7); | |
6075 | ||
6076 | return ptr; | |
6077 | } | |
6078 | ||
6079 | static CORE_ADDR | |
6080 | download_agent_expr (struct agent_expr *expr) | |
6081 | { | |
6082 | CORE_ADDR expr_addr; | |
6083 | CORE_ADDR expr_bytes; | |
6084 | ||
6085 | expr_addr = target_malloc (sizeof (*expr)); | |
6086 | write_inferior_memory (expr_addr, (unsigned char *) expr, sizeof (*expr)); | |
6087 | ||
6088 | expr_bytes = target_malloc (expr->length); | |
6089 | write_inferior_data_ptr (expr_addr + offsetof (struct agent_expr, bytes), | |
6090 | expr_bytes); | |
6091 | write_inferior_memory (expr_bytes, expr->bytes, expr->length); | |
6092 | ||
6093 | return expr_addr; | |
6094 | } | |
6095 | ||
6096 | /* Align V up to N bits. */ | |
6097 | #define UALIGN(V, N) (((V) + ((N) - 1)) & ~((N) - 1)) | |
6098 | ||
6099 | static void | |
6100 | download_tracepoints (void) | |
6101 | { | |
6102 | CORE_ADDR tpptr = 0, prev_tpptr = 0; | |
6103 | struct tracepoint *tpoint; | |
6104 | ||
6105 | /* Start out empty. */ | |
6106 | write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints, 0); | |
6107 | ||
6108 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
6109 | { | |
6110 | struct tracepoint target_tracepoint; | |
6111 | ||
0fb4aa4b PA |
6112 | if (tpoint->type != fast_tracepoint |
6113 | && tpoint->type != static_tracepoint) | |
fa593d66 PA |
6114 | continue; |
6115 | ||
6a271cae PA |
6116 | /* Maybe download a compiled condition. */ |
6117 | if (tpoint->cond != NULL && target_emit_ops () != NULL) | |
6118 | { | |
6119 | CORE_ADDR jentry, jump_entry; | |
6120 | ||
6121 | jentry = jump_entry = get_jump_space_head (); | |
6122 | ||
6123 | if (tpoint->cond != NULL) | |
6124 | { | |
6125 | /* Pad to 8-byte alignment. (needed?) */ | |
6126 | /* Actually this should be left for the target to | |
6127 | decide. */ | |
6128 | jentry = UALIGN (jentry, 8); | |
6129 | ||
6130 | compile_tracepoint_condition (tpoint, &jentry); | |
6131 | } | |
6132 | ||
6133 | /* Pad to 8-byte alignment. */ | |
6134 | jentry = UALIGN (jentry, 8); | |
6135 | claim_jump_space (jentry - jump_entry); | |
6136 | } | |
6137 | ||
fa593d66 PA |
6138 | target_tracepoint = *tpoint; |
6139 | ||
6140 | prev_tpptr = tpptr; | |
6141 | tpptr = target_malloc (sizeof (*tpoint)); | |
6142 | tpoint->obj_addr_on_target = tpptr; | |
6143 | ||
6144 | if (tpoint == tracepoints) | |
6145 | { | |
6146 | /* First object in list, set the head pointer in the | |
6147 | inferior. */ | |
6148 | write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints, tpptr); | |
6149 | } | |
6150 | else | |
6151 | { | |
6152 | write_inferior_data_ptr (prev_tpptr + offsetof (struct tracepoint, | |
6153 | next), | |
6154 | tpptr); | |
6155 | } | |
6156 | ||
6157 | /* Write the whole object. We'll fix up its pointers in a bit. | |
6158 | Assume no next for now. This is fixed up above on the next | |
6159 | iteration, if there's any. */ | |
6160 | target_tracepoint.next = NULL; | |
6161 | /* Need to clear this here too, since we're downloading the | |
6162 | tracepoints before clearing our own copy. */ | |
6163 | target_tracepoint.hit_count = 0; | |
6164 | ||
6165 | write_inferior_memory (tpptr, (unsigned char *) &target_tracepoint, | |
6166 | sizeof (target_tracepoint)); | |
6167 | ||
6168 | if (tpoint->cond) | |
6169 | write_inferior_data_ptr (tpptr + offsetof (struct tracepoint, | |
6170 | cond), | |
6171 | download_agent_expr (tpoint->cond)); | |
6172 | ||
6173 | if (tpoint->numactions) | |
6174 | { | |
6175 | int i; | |
6176 | CORE_ADDR actions_array; | |
6177 | ||
6178 | /* The pointers array. */ | |
6179 | actions_array | |
6180 | = target_malloc (sizeof (*tpoint->actions) * tpoint->numactions); | |
6181 | write_inferior_data_ptr (tpptr + offsetof (struct tracepoint, | |
6182 | actions), | |
6183 | actions_array); | |
6184 | ||
6185 | /* Now for each pointer, download the action. */ | |
6186 | for (i = 0; i < tpoint->numactions; i++) | |
6187 | { | |
6188 | CORE_ADDR ipa_action = 0; | |
6189 | struct tracepoint_action *action = tpoint->actions[i]; | |
6190 | ||
6191 | switch (action->type) | |
6192 | { | |
6193 | case 'M': | |
6194 | ipa_action | |
6195 | = target_malloc (sizeof (struct collect_memory_action)); | |
6196 | write_inferior_memory (ipa_action, | |
6197 | (unsigned char *) action, | |
6198 | sizeof (struct collect_memory_action)); | |
6199 | break; | |
6200 | case 'R': | |
6201 | ipa_action | |
6202 | = target_malloc (sizeof (struct collect_registers_action)); | |
6203 | write_inferior_memory (ipa_action, | |
6204 | (unsigned char *) action, | |
6205 | sizeof (struct collect_registers_action)); | |
6206 | break; | |
6207 | case 'X': | |
6208 | { | |
6209 | CORE_ADDR expr; | |
6210 | struct eval_expr_action *eaction | |
6211 | = (struct eval_expr_action *) action; | |
6212 | ||
6213 | ipa_action = target_malloc (sizeof (*eaction)); | |
6214 | write_inferior_memory (ipa_action, | |
6215 | (unsigned char *) eaction, | |
6216 | sizeof (*eaction)); | |
6217 | ||
6218 | expr = download_agent_expr (eaction->expr); | |
6219 | write_inferior_data_ptr | |
6220 | (ipa_action + offsetof (struct eval_expr_action, expr), | |
6221 | expr); | |
6222 | break; | |
6223 | } | |
0fb4aa4b PA |
6224 | case 'L': |
6225 | ipa_action = target_malloc | |
6226 | (sizeof (struct collect_static_trace_data_action)); | |
6227 | write_inferior_memory | |
6228 | (ipa_action, | |
6229 | (unsigned char *) action, | |
6230 | sizeof (struct collect_static_trace_data_action)); | |
6231 | break; | |
fa593d66 PA |
6232 | default: |
6233 | trace_debug ("unknown trace action '%c', ignoring", | |
6234 | action->type); | |
6235 | break; | |
6236 | } | |
6237 | ||
6238 | if (ipa_action != 0) | |
6239 | write_inferior_data_ptr | |
6240 | (actions_array + i * sizeof (sizeof (*tpoint->actions)), | |
6241 | ipa_action); | |
6242 | } | |
6243 | } | |
6244 | } | |
6245 | } | |
6246 | ||
6247 | static void | |
6248 | download_trace_state_variables (void) | |
6249 | { | |
6250 | CORE_ADDR ptr = 0, prev_ptr = 0; | |
6251 | struct trace_state_variable *tsv; | |
6252 | ||
6253 | /* Start out empty. */ | |
6254 | write_inferior_data_ptr (ipa_sym_addrs.addr_trace_state_variables, 0); | |
6255 | ||
6256 | for (tsv = trace_state_variables; tsv != NULL; tsv = tsv->next) | |
6257 | { | |
6258 | struct trace_state_variable target_tsv; | |
6259 | ||
6260 | /* TSV's with a getter have been initialized equally in both the | |
6261 | inferior and GDBserver. Skip them. */ | |
6262 | if (tsv->getter != NULL) | |
6263 | continue; | |
6264 | ||
6265 | target_tsv = *tsv; | |
6266 | ||
6267 | prev_ptr = ptr; | |
6268 | ptr = target_malloc (sizeof (*tsv)); | |
6269 | ||
6270 | if (tsv == trace_state_variables) | |
6271 | { | |
6272 | /* First object in list, set the head pointer in the | |
6273 | inferior. */ | |
6274 | ||
6275 | write_inferior_data_ptr (ipa_sym_addrs.addr_trace_state_variables, | |
6276 | ptr); | |
6277 | } | |
6278 | else | |
6279 | { | |
6280 | write_inferior_data_ptr (prev_ptr | |
6281 | + offsetof (struct trace_state_variable, | |
6282 | next), | |
6283 | ptr); | |
6284 | } | |
6285 | ||
6286 | /* Write the whole object. We'll fix up its pointers in a bit. | |
6287 | Assume no next, fixup when needed. */ | |
6288 | target_tsv.next = NULL; | |
6289 | ||
6290 | write_inferior_memory (ptr, (unsigned char *) &target_tsv, | |
6291 | sizeof (target_tsv)); | |
6292 | ||
6293 | if (tsv->name != NULL) | |
6294 | { | |
6295 | size_t size = strlen (tsv->name) + 1; | |
6296 | CORE_ADDR name_addr = target_malloc (size); | |
6297 | write_inferior_memory (name_addr, | |
6298 | (unsigned char *) tsv->name, size); | |
6299 | write_inferior_data_ptr (ptr | |
6300 | + offsetof (struct trace_state_variable, | |
6301 | name), | |
6302 | name_addr); | |
6303 | } | |
6304 | ||
6305 | if (tsv->getter != NULL) | |
6306 | { | |
6307 | fatal ("what to do with these?"); | |
6308 | } | |
6309 | } | |
6310 | ||
6311 | if (prev_ptr != 0) | |
6312 | { | |
6313 | /* Fixup the next pointer in the last item in the list. */ | |
493e2a69 MS |
6314 | write_inferior_data_ptr (prev_ptr |
6315 | + offsetof (struct trace_state_variable, | |
6316 | next), 0); | |
fa593d66 PA |
6317 | } |
6318 | } | |
6319 | ||
6320 | /* Upload complete trace frames out of the IP Agent's trace buffer | |
6321 | into GDBserver's trace buffer. This always uploads either all or | |
6322 | no trace frames. This is the counter part of | |
6323 | `trace_alloc_trace_buffer'. See its description of the atomic | |
6324 | synching mechanism. */ | |
6325 | ||
6326 | static void | |
6327 | upload_fast_traceframes (void) | |
6328 | { | |
6329 | unsigned int ipa_traceframe_read_count, ipa_traceframe_write_count; | |
6330 | unsigned int ipa_traceframe_read_count_racy, ipa_traceframe_write_count_racy; | |
6331 | CORE_ADDR tf; | |
6332 | struct ipa_trace_buffer_control ipa_trace_buffer_ctrl; | |
6333 | unsigned int curr_tbctrl_idx; | |
6334 | unsigned int ipa_trace_buffer_ctrl_curr; | |
6335 | unsigned int ipa_trace_buffer_ctrl_curr_old; | |
6336 | CORE_ADDR ipa_trace_buffer_ctrl_addr; | |
6337 | struct breakpoint *about_to_request_buffer_space_bkpt; | |
6338 | CORE_ADDR ipa_trace_buffer_lo; | |
6339 | CORE_ADDR ipa_trace_buffer_hi; | |
6340 | ||
6341 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, | |
6342 | &ipa_traceframe_read_count_racy)) | |
6343 | { | |
6344 | /* This will happen in most targets if the current thread is | |
6345 | running. */ | |
6346 | return; | |
6347 | } | |
6348 | ||
6349 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, | |
6350 | &ipa_traceframe_write_count_racy)) | |
6351 | return; | |
6352 | ||
6353 | trace_debug ("ipa_traceframe_count (racy area): %d (w=%d, r=%d)", | |
493e2a69 MS |
6354 | ipa_traceframe_write_count_racy |
6355 | - ipa_traceframe_read_count_racy, | |
6356 | ipa_traceframe_write_count_racy, | |
6357 | ipa_traceframe_read_count_racy); | |
fa593d66 PA |
6358 | |
6359 | if (ipa_traceframe_write_count_racy == ipa_traceframe_read_count_racy) | |
6360 | return; | |
6361 | ||
6362 | about_to_request_buffer_space_bkpt | |
6363 | = set_breakpoint_at (ipa_sym_addrs.addr_about_to_request_buffer_space, | |
6364 | NULL); | |
6365 | ||
6366 | if (read_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, | |
6367 | &ipa_trace_buffer_ctrl_curr)) | |
6368 | return; | |
6369 | ||
6370 | ipa_trace_buffer_ctrl_curr_old = ipa_trace_buffer_ctrl_curr; | |
6371 | ||
6372 | curr_tbctrl_idx = ipa_trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK; | |
6373 | ||
6374 | { | |
6375 | unsigned int prev, counter; | |
6376 | ||
6377 | /* Update the token, with new counters, and the GDBserver stamp | |
6378 | bit. Alway reuse the current TBC index. */ | |
6379 | prev = ipa_trace_buffer_ctrl_curr & 0x0007ff00; | |
6380 | counter = (prev + 0x100) & 0x0007ff00; | |
6381 | ||
6382 | ipa_trace_buffer_ctrl_curr = (0x80000000 | |
6383 | | (prev << 12) | |
6384 | | counter | |
6385 | | curr_tbctrl_idx); | |
6386 | } | |
6387 | ||
6388 | if (write_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, | |
6389 | ipa_trace_buffer_ctrl_curr)) | |
6390 | return; | |
6391 | ||
6392 | trace_debug ("Lib: Committed %08x -> %08x", | |
6393 | ipa_trace_buffer_ctrl_curr_old, | |
6394 | ipa_trace_buffer_ctrl_curr); | |
6395 | ||
6396 | /* Re-read these, now that we've installed the | |
6397 | `about_to_request_buffer_space' breakpoint/lock. A thread could | |
6398 | have finished a traceframe between the last read of these | |
6399 | counters and setting the breakpoint above. If we start | |
6400 | uploading, we never want to leave this function with | |
6401 | traceframe_read_count != 0, otherwise, GDBserver could end up | |
6402 | incrementing the counter tokens more than once (due to event loop | |
6403 | nesting), which would break the IP agent's "effective" detection | |
6404 | (see trace_alloc_trace_buffer). */ | |
6405 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, | |
6406 | &ipa_traceframe_read_count)) | |
6407 | return; | |
6408 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, | |
6409 | &ipa_traceframe_write_count)) | |
6410 | return; | |
6411 | ||
6412 | if (debug_threads) | |
6413 | { | |
6414 | trace_debug ("ipa_traceframe_count (blocked area): %d (w=%d, r=%d)", | |
6415 | ipa_traceframe_write_count - ipa_traceframe_read_count, | |
6416 | ipa_traceframe_write_count, ipa_traceframe_read_count); | |
6417 | ||
6418 | if (ipa_traceframe_write_count != ipa_traceframe_write_count_racy | |
6419 | || ipa_traceframe_read_count != ipa_traceframe_read_count_racy) | |
6420 | trace_debug ("note that ipa_traceframe_count's parts changed"); | |
6421 | } | |
6422 | ||
6423 | /* Get the address of the current TBC object (the IP agent has an | |
6424 | array of 3 such objects). The index is stored in the TBC | |
6425 | token. */ | |
6426 | ipa_trace_buffer_ctrl_addr = ipa_sym_addrs.addr_trace_buffer_ctrl; | |
6427 | ipa_trace_buffer_ctrl_addr | |
6428 | += sizeof (struct ipa_trace_buffer_control) * curr_tbctrl_idx; | |
6429 | ||
6430 | if (read_inferior_memory (ipa_trace_buffer_ctrl_addr, | |
6431 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
6432 | sizeof (struct ipa_trace_buffer_control))) | |
6433 | return; | |
6434 | ||
6435 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_lo, | |
6436 | &ipa_trace_buffer_lo)) | |
6437 | return; | |
6438 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_hi, | |
6439 | &ipa_trace_buffer_hi)) | |
6440 | return; | |
6441 | ||
6442 | /* Offsets are easier to grok for debugging than raw addresses, | |
6443 | especially for the small trace buffer sizes that are useful for | |
6444 | testing. */ | |
6445 | trace_debug ("Lib: Trace buffer [%d] start=%d free=%d " | |
6446 | "endfree=%d wrap=%d hi=%d", | |
6447 | curr_tbctrl_idx, | |
6448 | (int) (ipa_trace_buffer_ctrl.start - ipa_trace_buffer_lo), | |
6449 | (int) (ipa_trace_buffer_ctrl.free - ipa_trace_buffer_lo), | |
6450 | (int) (ipa_trace_buffer_ctrl.end_free - ipa_trace_buffer_lo), | |
6451 | (int) (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo), | |
6452 | (int) (ipa_trace_buffer_hi - ipa_trace_buffer_lo)); | |
6453 | ||
6454 | /* Note that the IPA's buffer is always circular. */ | |
6455 | ||
6456 | #define IPA_FIRST_TRACEFRAME() (ipa_trace_buffer_ctrl.start) | |
6457 | ||
6458 | #define IPA_NEXT_TRACEFRAME_1(TF, TFOBJ) \ | |
6459 | ((TF) + sizeof (struct traceframe) + (TFOBJ)->data_size) | |
6460 | ||
6461 | #define IPA_NEXT_TRACEFRAME(TF, TFOBJ) \ | |
6462 | (IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) \ | |
6463 | - ((IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) >= ipa_trace_buffer_ctrl.wrap) \ | |
6464 | ? (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo) \ | |
6465 | : 0)) | |
6466 | ||
6467 | tf = IPA_FIRST_TRACEFRAME (); | |
6468 | ||
6469 | while (ipa_traceframe_write_count - ipa_traceframe_read_count) | |
6470 | { | |
6471 | struct tracepoint *tpoint; | |
6472 | struct traceframe *tframe; | |
6473 | unsigned char *block; | |
6474 | struct traceframe ipa_tframe; | |
6475 | ||
6476 | if (read_inferior_memory (tf, (unsigned char *) &ipa_tframe, | |
6477 | offsetof (struct traceframe, data))) | |
6478 | error ("Uploading: couldn't read traceframe at %s\n", paddress (tf)); | |
6479 | ||
6480 | if (ipa_tframe.tpnum == 0) | |
6481 | fatal ("Uploading: No (more) fast traceframes, but " | |
6482 | "ipa_traceframe_count == %u??\n", | |
6483 | ipa_traceframe_write_count - ipa_traceframe_read_count); | |
6484 | ||
6485 | /* Note that this will be incorrect for multi-location | |
6486 | tracepoints... */ | |
6487 | tpoint = find_next_tracepoint_by_number (NULL, ipa_tframe.tpnum); | |
6488 | ||
6489 | tframe = add_traceframe (tpoint); | |
6490 | if (tframe == NULL) | |
6491 | { | |
6492 | trace_buffer_is_full = 1; | |
6493 | trace_debug ("Uploading: trace buffer is full"); | |
6494 | } | |
6495 | else | |
6496 | { | |
6497 | /* Copy the whole set of blocks in one go for now. FIXME: | |
6498 | split this in smaller blocks. */ | |
6499 | block = add_traceframe_block (tframe, ipa_tframe.data_size); | |
6500 | if (block != NULL) | |
6501 | { | |
493e2a69 MS |
6502 | if (read_inferior_memory (tf |
6503 | + offsetof (struct traceframe, data), | |
fa593d66 PA |
6504 | block, ipa_tframe.data_size)) |
6505 | error ("Uploading: Couldn't read traceframe data at %s\n", | |
6506 | paddress (tf + offsetof (struct traceframe, data))); | |
6507 | } | |
6508 | ||
6509 | trace_debug ("Uploading: traceframe didn't fit"); | |
6510 | finish_traceframe (tframe); | |
6511 | } | |
6512 | ||
6513 | tf = IPA_NEXT_TRACEFRAME (tf, &ipa_tframe); | |
6514 | ||
6515 | /* If we freed the traceframe that wrapped around, go back | |
6516 | to the non-wrap case. */ | |
6517 | if (tf < ipa_trace_buffer_ctrl.start) | |
6518 | { | |
6519 | trace_debug ("Lib: Discarding past the wraparound"); | |
6520 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
6521 | } | |
6522 | ipa_trace_buffer_ctrl.start = tf; | |
6523 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_ctrl.start; | |
6524 | ++ipa_traceframe_read_count; | |
6525 | ||
6526 | if (ipa_trace_buffer_ctrl.start == ipa_trace_buffer_ctrl.free | |
6527 | && ipa_trace_buffer_ctrl.start == ipa_trace_buffer_ctrl.end_free) | |
6528 | { | |
6529 | trace_debug ("Lib: buffer is fully empty. " | |
6530 | "Trace buffer [%d] start=%d free=%d endfree=%d", | |
6531 | curr_tbctrl_idx, | |
6532 | (int) (ipa_trace_buffer_ctrl.start | |
6533 | - ipa_trace_buffer_lo), | |
6534 | (int) (ipa_trace_buffer_ctrl.free | |
6535 | - ipa_trace_buffer_lo), | |
6536 | (int) (ipa_trace_buffer_ctrl.end_free | |
6537 | - ipa_trace_buffer_lo)); | |
6538 | ||
6539 | ipa_trace_buffer_ctrl.start = ipa_trace_buffer_lo; | |
6540 | ipa_trace_buffer_ctrl.free = ipa_trace_buffer_lo; | |
6541 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_hi; | |
6542 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
6543 | } | |
6544 | ||
6545 | trace_debug ("Uploaded a traceframe\n" | |
6546 | "Lib: Trace buffer [%d] start=%d free=%d " | |
6547 | "endfree=%d wrap=%d hi=%d", | |
6548 | curr_tbctrl_idx, | |
6549 | (int) (ipa_trace_buffer_ctrl.start - ipa_trace_buffer_lo), | |
6550 | (int) (ipa_trace_buffer_ctrl.free - ipa_trace_buffer_lo), | |
493e2a69 MS |
6551 | (int) (ipa_trace_buffer_ctrl.end_free |
6552 | - ipa_trace_buffer_lo), | |
fa593d66 PA |
6553 | (int) (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo), |
6554 | (int) (ipa_trace_buffer_hi - ipa_trace_buffer_lo)); | |
6555 | } | |
6556 | ||
6557 | if (write_inferior_memory (ipa_trace_buffer_ctrl_addr, | |
6558 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
6559 | sizeof (struct ipa_trace_buffer_control))) | |
6560 | return; | |
6561 | ||
6562 | write_inferior_integer (ipa_sym_addrs.addr_traceframe_read_count, | |
6563 | ipa_traceframe_read_count); | |
6564 | ||
6565 | trace_debug ("Done uploading traceframes [%d]\n", curr_tbctrl_idx); | |
6566 | ||
6567 | pause_all (1); | |
6568 | cancel_breakpoints (); | |
6569 | ||
6570 | delete_breakpoint (about_to_request_buffer_space_bkpt); | |
6571 | about_to_request_buffer_space_bkpt = NULL; | |
6572 | ||
6573 | unpause_all (1); | |
6574 | ||
6575 | if (trace_buffer_is_full) | |
6576 | stop_tracing (); | |
6577 | } | |
6578 | #endif | |
6579 | ||
6580 | #ifdef IN_PROCESS_AGENT | |
6581 | ||
0fb4aa4b PA |
6582 | IP_AGENT_EXPORT int ust_loaded; |
6583 | IP_AGENT_EXPORT char cmd_buf[CMD_BUF_SIZE]; | |
fa593d66 | 6584 | |
0fb4aa4b | 6585 | #ifdef HAVE_UST |
fa593d66 | 6586 | |
0fb4aa4b PA |
6587 | /* Static tracepoints. */ |
6588 | ||
6589 | /* UST puts a "struct tracepoint" in the global namespace, which | |
6590 | conflicts with our tracepoint. Arguably, being a library, it | |
6591 | shouldn't take ownership of such a generic name. We work around it | |
6592 | here. */ | |
6593 | #define tracepoint ust_tracepoint | |
6594 | #include <ust/ust.h> | |
6595 | #undef tracepoint | |
6596 | ||
6597 | extern int serialize_to_text (char *outbuf, int bufsize, | |
6598 | const char *fmt, va_list ap); | |
6599 | ||
6600 | #define GDB_PROBE_NAME "gdb" | |
6601 | ||
6602 | /* We dynamically search for the UST symbols instead of linking them | |
6603 | in. This lets the user decide if the application uses static | |
6604 | tracepoints, instead of always pulling libust.so in. This vector | |
6605 | holds pointers to all functions we care about. */ | |
6606 | ||
6607 | static struct | |
fa593d66 | 6608 | { |
0fb4aa4b PA |
6609 | int (*serialize_to_text) (char *outbuf, int bufsize, |
6610 | const char *fmt, va_list ap); | |
6611 | ||
6612 | int (*ltt_probe_register) (struct ltt_available_probe *pdata); | |
6613 | int (*ltt_probe_unregister) (struct ltt_available_probe *pdata); | |
6614 | ||
6615 | int (*ltt_marker_connect) (const char *channel, const char *mname, | |
6616 | const char *pname); | |
6617 | int (*ltt_marker_disconnect) (const char *channel, const char *mname, | |
6618 | const char *pname); | |
6619 | ||
6620 | void (*marker_iter_start) (struct marker_iter *iter); | |
6621 | void (*marker_iter_next) (struct marker_iter *iter); | |
6622 | void (*marker_iter_stop) (struct marker_iter *iter); | |
6623 | void (*marker_iter_reset) (struct marker_iter *iter); | |
6624 | } ust_ops; | |
6625 | ||
6626 | #include <dlfcn.h> | |
6627 | ||
6628 | /* Cast through typeof to catch incompatible API changes. Since UST | |
6629 | only builds with gcc, we can freely use gcc extensions here | |
6630 | too. */ | |
6631 | #define GET_UST_SYM(SYM) \ | |
6632 | do \ | |
6633 | { \ | |
6634 | if (ust_ops.SYM == NULL) \ | |
6635 | ust_ops.SYM = (typeof (&SYM)) dlsym (RTLD_DEFAULT, #SYM); \ | |
6636 | if (ust_ops.SYM == NULL) \ | |
6637 | return 0; \ | |
6638 | } while (0) | |
6639 | ||
6640 | #define USTF(SYM) ust_ops.SYM | |
6641 | ||
6642 | /* Get pointers to all libust.so functions we care about. */ | |
6643 | ||
6644 | static int | |
6645 | dlsym_ust (void) | |
6646 | { | |
6647 | GET_UST_SYM (serialize_to_text); | |
6648 | ||
6649 | GET_UST_SYM (ltt_probe_register); | |
6650 | GET_UST_SYM (ltt_probe_unregister); | |
6651 | GET_UST_SYM (ltt_marker_connect); | |
6652 | GET_UST_SYM (ltt_marker_disconnect); | |
6653 | ||
6654 | GET_UST_SYM (marker_iter_start); | |
6655 | GET_UST_SYM (marker_iter_next); | |
6656 | GET_UST_SYM (marker_iter_stop); | |
6657 | GET_UST_SYM (marker_iter_reset); | |
6658 | ||
6659 | ust_loaded = 1; | |
6660 | return 1; | |
fa593d66 PA |
6661 | } |
6662 | ||
0fb4aa4b PA |
6663 | /* Given an UST marker, return the matching gdb static tracepoint. |
6664 | The match is done by address. */ | |
6665 | ||
6666 | static struct tracepoint * | |
6667 | ust_marker_to_static_tracepoint (const struct marker *mdata) | |
6668 | { | |
6669 | struct tracepoint *tpoint; | |
6670 | ||
6671 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
6672 | { | |
d248b706 | 6673 | if (tpoint->type != static_tracepoint) |
0fb4aa4b PA |
6674 | continue; |
6675 | ||
6676 | if (tpoint->address == (uintptr_t) mdata->location) | |
6677 | return tpoint; | |
6678 | } | |
6679 | ||
6680 | return NULL; | |
6681 | } | |
6682 | ||
6683 | /* The probe function we install on lttng/ust markers. Whenever a | |
6684 | probed ust marker is hit, this function is called. This is similar | |
6685 | to gdb_collect, only for static tracepoints, instead of fast | |
6686 | tracepoints. */ | |
6687 | ||
6688 | static void | |
6689 | gdb_probe (const struct marker *mdata, void *probe_private, | |
6690 | struct registers *regs, void *call_private, | |
6691 | const char *fmt, va_list *args) | |
6692 | { | |
6693 | struct tracepoint *tpoint; | |
6694 | struct static_tracepoint_ctx ctx; | |
6695 | ||
6696 | /* Don't do anything until the trace run is completely set up. */ | |
6697 | if (!tracing) | |
6698 | { | |
6699 | trace_debug ("gdb_probe: not tracing\n"); | |
6700 | return; | |
6701 | } | |
6702 | ||
6703 | ctx.base.type = static_tracepoint; | |
6704 | ctx.regcache_initted = 0; | |
6705 | ctx.regs = regs; | |
6706 | ctx.fmt = fmt; | |
6707 | ctx.args = args; | |
6708 | ||
6709 | /* Wrap the regblock in a register cache (in the stack, we don't | |
6710 | want to malloc here). */ | |
6711 | ctx.regspace = alloca (register_cache_size ()); | |
6712 | if (ctx.regspace == NULL) | |
6713 | { | |
6714 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
6715 | return; | |
6716 | } | |
6717 | ||
6718 | tpoint = ust_marker_to_static_tracepoint (mdata); | |
6719 | if (tpoint == NULL) | |
6720 | { | |
6721 | trace_debug ("gdb_probe: marker not known: " | |
6722 | "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"", | |
6723 | mdata->location, mdata->channel, | |
6724 | mdata->name, mdata->format); | |
6725 | return; | |
6726 | } | |
6727 | ||
d248b706 KY |
6728 | if (!tpoint->enabled) |
6729 | { | |
6730 | trace_debug ("gdb_probe: tracepoint disabled"); | |
6731 | return; | |
6732 | } | |
6733 | ||
0fb4aa4b PA |
6734 | ctx.tpoint = tpoint; |
6735 | ||
6736 | trace_debug ("gdb_probe: collecting marker: " | |
6737 | "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"", | |
6738 | mdata->location, mdata->channel, | |
6739 | mdata->name, mdata->format); | |
6740 | ||
6741 | /* Test the condition if present, and collect if true. */ | |
6742 | if (tpoint->cond == NULL | |
6743 | || condition_true_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
6744 | tpoint)) | |
6745 | { | |
6746 | collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
6747 | tpoint->address, tpoint); | |
6748 | ||
6749 | if (stopping_tracepoint | |
6750 | || trace_buffer_is_full | |
6751 | || expr_eval_result != expr_eval_no_error) | |
6752 | stop_tracing (); | |
6753 | } | |
6754 | else | |
6755 | { | |
6756 | /* If there was a condition and it evaluated to false, the only | |
6757 | way we would stop tracing is if there was an error during | |
6758 | condition expression evaluation. */ | |
6759 | if (expr_eval_result != expr_eval_no_error) | |
6760 | stop_tracing (); | |
6761 | } | |
6762 | } | |
6763 | ||
6764 | /* Called if the gdb static tracepoint requested collecting "$_sdata", | |
6765 | static tracepoint string data. This is a string passed to the | |
6766 | tracing library by the user, at the time of the tracepoint marker | |
6767 | call. E.g., in the UST marker call: | |
6768 | ||
6769 | trace_mark (ust, bar33, "str %s", "FOOBAZ"); | |
6770 | ||
6771 | the collected data is "str FOOBAZ". | |
6772 | */ | |
6773 | ||
6774 | static void | |
6775 | collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
6776 | CORE_ADDR stop_pc, | |
6777 | struct tracepoint *tpoint, | |
6778 | struct traceframe *tframe) | |
6779 | { | |
6780 | struct static_tracepoint_ctx *umd = (struct static_tracepoint_ctx *) ctx; | |
6781 | unsigned char *bufspace; | |
6782 | int size; | |
6783 | va_list copy; | |
6784 | unsigned short blocklen; | |
6785 | ||
6786 | if (umd == NULL) | |
6787 | { | |
6788 | trace_debug ("Wanted to collect static trace data, " | |
6789 | "but there's no static trace data"); | |
6790 | return; | |
6791 | } | |
6792 | ||
6793 | va_copy (copy, *umd->args); | |
6794 | size = USTF(serialize_to_text) (NULL, 0, umd->fmt, copy); | |
6795 | va_end (copy); | |
6796 | ||
6797 | trace_debug ("Want to collect ust data"); | |
6798 | ||
6799 | /* 'S' + size + string */ | |
6800 | bufspace = add_traceframe_block (tframe, | |
6801 | 1 + sizeof (blocklen) + size + 1); | |
6802 | if (bufspace == NULL) | |
6803 | { | |
6804 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
6805 | return; | |
6806 | } | |
6807 | ||
6808 | /* Identify a static trace data block. */ | |
6809 | *bufspace = 'S'; | |
6810 | ||
6811 | blocklen = size + 1; | |
6812 | memcpy (bufspace + 1, &blocklen, sizeof (blocklen)); | |
6813 | ||
6814 | va_copy (copy, *umd->args); | |
6815 | USTF(serialize_to_text) ((char *) bufspace + 1 + sizeof (blocklen), | |
6816 | size + 1, umd->fmt, copy); | |
6817 | va_end (copy); | |
6818 | ||
6819 | trace_debug ("Storing static tracepoint data in regblock: %s", | |
6820 | bufspace + 1 + sizeof (blocklen)); | |
6821 | } | |
6822 | ||
6823 | /* The probe to register with lttng/ust. */ | |
6824 | static struct ltt_available_probe gdb_ust_probe = | |
6825 | { | |
6826 | GDB_PROBE_NAME, | |
6827 | NULL, | |
6828 | gdb_probe, | |
6829 | }; | |
6830 | ||
6831 | #endif /* HAVE_UST */ | |
6832 | #endif /* IN_PROCESS_AGENT */ | |
6833 | ||
6834 | #ifdef HAVE_UST | |
6835 | ||
6836 | #include <sys/socket.h> | |
6837 | #include <sys/un.h> | |
6838 | ||
6839 | #ifndef UNIX_PATH_MAX | |
6840 | #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path) | |
6841 | #endif | |
6842 | ||
6843 | /* Where we put the socked used for synchronization. */ | |
6844 | #define SOCK_DIR P_tmpdir | |
6845 | ||
6846 | #endif /* HAVE_UST */ | |
6847 | ||
6848 | #ifndef IN_PROCESS_AGENT | |
6849 | ||
6850 | #ifdef HAVE_UST | |
6851 | ||
6852 | static int | |
6853 | gdb_ust_connect_sync_socket (int pid) | |
6854 | { | |
6855 | struct sockaddr_un addr; | |
6856 | int res, fd; | |
6857 | char path[UNIX_PATH_MAX]; | |
6858 | ||
6cebaf6e | 6859 | res = xsnprintf (path, UNIX_PATH_MAX, "%s/gdb_ust%d", SOCK_DIR, pid); |
0fb4aa4b PA |
6860 | if (res >= UNIX_PATH_MAX) |
6861 | { | |
6862 | trace_debug ("string overflow allocating socket name"); | |
6863 | return -1; | |
6864 | } | |
6865 | ||
6866 | res = fd = socket (PF_UNIX, SOCK_STREAM, 0); | |
6867 | if (res == -1) | |
6868 | { | |
6869 | warning ("error opening sync socket: %s\n", strerror (errno)); | |
6870 | return -1; | |
6871 | } | |
6872 | ||
6873 | addr.sun_family = AF_UNIX; | |
6874 | ||
6cebaf6e | 6875 | res = xsnprintf (addr.sun_path, UNIX_PATH_MAX, "%s", path); |
0fb4aa4b PA |
6876 | if (res >= UNIX_PATH_MAX) |
6877 | { | |
6878 | warning ("string overflow allocating socket name\n"); | |
6879 | close (fd); | |
6880 | return -1; | |
6881 | } | |
6882 | ||
6883 | res = connect (fd, (struct sockaddr *) &addr, sizeof (addr)); | |
6884 | if (res == -1) | |
6885 | { | |
6886 | warning ("error connecting sync socket (%s): %s. " | |
6887 | "Make sure the directory exists and that it is writable.", | |
6888 | path, strerror (errno)); | |
6889 | close (fd); | |
6890 | return -1; | |
6891 | } | |
6892 | ||
6893 | return fd; | |
6894 | } | |
6895 | ||
6896 | /* Resume thread PTID. */ | |
6897 | ||
6898 | static void | |
6899 | resume_thread (ptid_t ptid) | |
6900 | { | |
6901 | struct thread_resume resume_info; | |
6902 | ||
6903 | resume_info.thread = ptid; | |
6904 | resume_info.kind = resume_continue; | |
6905 | resume_info.sig = TARGET_SIGNAL_0; | |
6906 | (*the_target->resume) (&resume_info, 1); | |
6907 | } | |
6908 | ||
6909 | /* Stop thread PTID. */ | |
6910 | ||
6911 | static void | |
6912 | stop_thread (ptid_t ptid) | |
6913 | { | |
6914 | struct thread_resume resume_info; | |
6915 | ||
6916 | resume_info.thread = ptid; | |
6917 | resume_info.kind = resume_stop; | |
6918 | resume_info.sig = TARGET_SIGNAL_0; | |
6919 | (*the_target->resume) (&resume_info, 1); | |
6920 | } | |
6921 | ||
6922 | /* Ask the in-process agent to run a command. Since we don't want to | |
6923 | have to handle the IPA hitting breakpoints while running the | |
6924 | command, we pause all threads, remove all breakpoints, and then set | |
6925 | the helper thread re-running. We communicate with the helper | |
6926 | thread by means of direct memory xfering, and a socket for | |
6927 | synchronization. */ | |
6928 | ||
6929 | static int | |
6930 | run_inferior_command (char *cmd) | |
6931 | { | |
6932 | int err = -1; | |
6933 | int fd = -1; | |
6934 | int pid = ptid_get_pid (current_inferior->entry.id); | |
6935 | int tid; | |
6936 | ptid_t ptid = null_ptid; | |
6937 | ||
6938 | trace_debug ("run_inferior_command: running: %s", cmd); | |
6939 | ||
6940 | pause_all (0); | |
6941 | uninsert_all_breakpoints (); | |
6942 | ||
6943 | if (read_inferior_integer (ipa_sym_addrs.addr_helper_thread_id, &tid)) | |
6944 | { | |
6945 | warning ("Error reading helper thread's id in lib"); | |
6946 | goto out; | |
6947 | } | |
6948 | ||
6949 | if (tid == 0) | |
6950 | { | |
6951 | warning ("helper thread not initialized yet"); | |
6952 | goto out; | |
6953 | } | |
6954 | ||
6955 | if (write_inferior_memory (ipa_sym_addrs.addr_cmd_buf, | |
6956 | (unsigned char *) cmd, strlen (cmd) + 1)) | |
6957 | { | |
6958 | warning ("Error writing command"); | |
6959 | goto out; | |
6960 | } | |
6961 | ||
6962 | ptid = ptid_build (pid, tid, 0); | |
6963 | ||
6964 | resume_thread (ptid); | |
6965 | ||
6966 | fd = gdb_ust_connect_sync_socket (pid); | |
6967 | if (fd >= 0) | |
6968 | { | |
6969 | char buf[1] = ""; | |
6970 | int ret; | |
6971 | ||
6972 | trace_debug ("signalling helper thread"); | |
6973 | ||
6974 | do | |
6975 | { | |
6976 | ret = write (fd, buf, 1); | |
6977 | } while (ret == -1 && errno == EINTR); | |
6978 | ||
6979 | trace_debug ("waiting for helper thread's response"); | |
6980 | ||
6981 | do | |
6982 | { | |
6983 | ret = read (fd, buf, 1); | |
6984 | } while (ret == -1 && errno == EINTR); | |
6985 | ||
6986 | close (fd); | |
6987 | ||
6988 | trace_debug ("helper thread's response received"); | |
6989 | } | |
6990 | ||
6991 | out: | |
6992 | ||
6993 | /* Need to read response with the inferior stopped. */ | |
6994 | if (!ptid_equal (ptid, null_ptid)) | |
6995 | { | |
6996 | int was_non_stop = non_stop; | |
6997 | struct target_waitstatus status; | |
6998 | ||
6999 | stop_thread (ptid); | |
7000 | non_stop = 1; | |
7001 | mywait (ptid, &status, 0, 0); | |
7002 | non_stop = was_non_stop; | |
7003 | } | |
7004 | ||
7005 | if (fd >= 0) | |
7006 | { | |
7007 | if (read_inferior_memory (ipa_sym_addrs.addr_cmd_buf, | |
7008 | (unsigned char *) cmd, CMD_BUF_SIZE)) | |
7009 | { | |
7010 | warning ("Error reading command response"); | |
7011 | } | |
7012 | else | |
7013 | { | |
7014 | err = 0; | |
7015 | trace_debug ("run_inferior_command: response: %s", cmd); | |
7016 | } | |
7017 | } | |
7018 | ||
7019 | reinsert_all_breakpoints (); | |
7020 | unpause_all (0); | |
7021 | ||
7022 | return err; | |
7023 | } | |
7024 | ||
7025 | #else /* HAVE_UST */ | |
7026 | ||
7027 | static int | |
7028 | run_inferior_command (char *cmd) | |
7029 | { | |
7030 | return -1; | |
7031 | } | |
7032 | ||
7033 | #endif /* HAVE_UST */ | |
7034 | ||
7035 | #else /* !IN_PROCESS_AGENT */ | |
7036 | ||
7037 | /* Thread ID of the helper thread. GDBserver reads this to know which | |
7038 | is the help thread. This is an LWP id on Linux. */ | |
7039 | int helper_thread_id; | |
7040 | ||
7041 | #ifdef HAVE_UST | |
7042 | ||
7043 | static int | |
7044 | init_named_socket (const char *name) | |
7045 | { | |
7046 | int result, fd; | |
7047 | struct sockaddr_un addr; | |
7048 | ||
7049 | result = fd = socket (PF_UNIX, SOCK_STREAM, 0); | |
7050 | if (result == -1) | |
7051 | { | |
7052 | warning ("socket creation failed: %s", strerror (errno)); | |
7053 | return -1; | |
7054 | } | |
7055 | ||
7056 | addr.sun_family = AF_UNIX; | |
7057 | ||
7058 | strncpy (addr.sun_path, name, UNIX_PATH_MAX); | |
7059 | addr.sun_path[UNIX_PATH_MAX - 1] = '\0'; | |
7060 | ||
7061 | result = access (name, F_OK); | |
7062 | if (result == 0) | |
7063 | { | |
7064 | /* File exists. */ | |
7065 | result = unlink (name); | |
7066 | if (result == -1) | |
7067 | { | |
7068 | warning ("unlink failed: %s", strerror (errno)); | |
7069 | close (fd); | |
7070 | return -1; | |
7071 | } | |
7072 | warning ("socket %s already exists; overwriting", name); | |
7073 | } | |
7074 | ||
7075 | result = bind (fd, (struct sockaddr *) &addr, sizeof (addr)); | |
7076 | if (result == -1) | |
7077 | { | |
7078 | warning ("bind failed: %s", strerror (errno)); | |
7079 | close (fd); | |
7080 | return -1; | |
7081 | } | |
7082 | ||
7083 | result = listen (fd, 1); | |
7084 | if (result == -1) | |
7085 | { | |
7086 | warning ("listen: %s", strerror (errno)); | |
7087 | close (fd); | |
7088 | return -1; | |
7089 | } | |
7090 | ||
7091 | return fd; | |
7092 | } | |
7093 | ||
7094 | static int | |
7095 | gdb_ust_socket_init (void) | |
7096 | { | |
7097 | int result, fd; | |
7098 | char name[UNIX_PATH_MAX]; | |
7099 | ||
6cebaf6e | 7100 | result = xsnprintf (name, UNIX_PATH_MAX, "%s/gdb_ust%d", |
7101 | SOCK_DIR, getpid ()); | |
0fb4aa4b PA |
7102 | if (result >= UNIX_PATH_MAX) |
7103 | { | |
7104 | trace_debug ("string overflow allocating socket name"); | |
7105 | return -1; | |
7106 | } | |
7107 | ||
7108 | fd = init_named_socket (name); | |
7109 | if (fd < 0) | |
7110 | warning ("Error initializing named socket (%s) for communication with the " | |
7111 | "ust helper thread. Check that directory exists and that it " | |
7112 | "is writable.", name); | |
7113 | ||
7114 | return fd; | |
7115 | } | |
7116 | ||
7117 | /* Return an hexstr version of the STR C string, fit for sending to | |
7118 | GDB. */ | |
7119 | ||
7120 | static char * | |
7121 | cstr_to_hexstr (const char *str) | |
7122 | { | |
7123 | int len = strlen (str); | |
7124 | char *hexstr = xmalloc (len * 2 + 1); | |
7125 | convert_int_to_ascii ((gdb_byte *) str, hexstr, len); | |
7126 | return hexstr; | |
7127 | } | |
7128 | ||
7129 | /* The next marker to be returned on a qTsSTM command. */ | |
7130 | static const struct marker *next_st; | |
7131 | ||
7132 | /* Returns the first known marker. */ | |
7133 | ||
7134 | struct marker * | |
7135 | first_marker (void) | |
7136 | { | |
7137 | struct marker_iter iter; | |
7138 | ||
7139 | USTF(marker_iter_reset) (&iter); | |
7140 | USTF(marker_iter_start) (&iter); | |
7141 | ||
7142 | return iter.marker; | |
7143 | } | |
7144 | ||
7145 | /* Returns the marker following M. */ | |
7146 | ||
7147 | const struct marker * | |
7148 | next_marker (const struct marker *m) | |
7149 | { | |
7150 | struct marker_iter iter; | |
7151 | ||
7152 | USTF(marker_iter_reset) (&iter); | |
7153 | USTF(marker_iter_start) (&iter); | |
7154 | ||
7155 | for (; iter.marker != NULL; USTF(marker_iter_next) (&iter)) | |
7156 | { | |
7157 | if (iter.marker == m) | |
7158 | { | |
7159 | USTF(marker_iter_next) (&iter); | |
7160 | return iter.marker; | |
7161 | } | |
7162 | } | |
7163 | ||
7164 | return NULL; | |
7165 | } | |
7166 | ||
7167 | /* Compose packet that is the response to the qTsSTM/qTfSTM/qTSTMat | |
7168 | packets. */ | |
7169 | ||
7170 | static void | |
7171 | response_ust_marker (char *packet, const struct marker *st) | |
7172 | { | |
7173 | char *strid, *format, *tmp; | |
7174 | ||
7175 | next_st = next_marker (st); | |
7176 | ||
7177 | tmp = xmalloc (strlen (st->channel) + 1 + | |
7178 | strlen (st->name) + 1); | |
7179 | sprintf (tmp, "%s/%s", st->channel, st->name); | |
7180 | ||
7181 | strid = cstr_to_hexstr (tmp); | |
7182 | free (tmp); | |
7183 | ||
7184 | format = cstr_to_hexstr (st->format); | |
7185 | ||
7186 | sprintf (packet, "m%s:%s:%s", | |
7187 | paddress ((uintptr_t) st->location), | |
7188 | strid, | |
7189 | format); | |
7190 | ||
7191 | free (strid); | |
7192 | free (format); | |
7193 | } | |
7194 | ||
7195 | /* Return the first static tracepoint, and initialize the state | |
7196 | machine that will iterate through all the static tracepoints. */ | |
7197 | ||
7198 | static void | |
7199 | cmd_qtfstm (char *packet) | |
7200 | { | |
7201 | trace_debug ("Returning first trace state variable definition"); | |
7202 | ||
7203 | if (first_marker ()) | |
7204 | response_ust_marker (packet, first_marker ()); | |
7205 | else | |
7206 | strcpy (packet, "l"); | |
7207 | } | |
7208 | ||
7209 | /* Return additional trace state variable definitions. */ | |
7210 | ||
7211 | static void | |
7212 | cmd_qtsstm (char *packet) | |
7213 | { | |
7214 | trace_debug ("Returning static tracepoint"); | |
7215 | ||
7216 | if (next_st) | |
7217 | response_ust_marker (packet, next_st); | |
7218 | else | |
7219 | strcpy (packet, "l"); | |
7220 | } | |
7221 | ||
7222 | /* Disconnect the GDB probe from a marker at a given address. */ | |
7223 | ||
7224 | static void | |
7225 | unprobe_marker_at (char *packet) | |
7226 | { | |
7227 | char *p = packet; | |
7228 | ULONGEST address; | |
7229 | struct marker_iter iter; | |
7230 | ||
7231 | p += sizeof ("unprobe_marker_at:") - 1; | |
7232 | ||
7233 | p = unpack_varlen_hex (p, &address); | |
7234 | ||
7235 | USTF(marker_iter_reset) (&iter); | |
7236 | USTF(marker_iter_start) (&iter); | |
7237 | for (; iter.marker != NULL; USTF(marker_iter_next) (&iter)) | |
7238 | if ((uintptr_t ) iter.marker->location == address) | |
7239 | { | |
7240 | int result; | |
7241 | ||
7242 | result = USTF(ltt_marker_disconnect) (iter.marker->channel, | |
7243 | iter.marker->name, | |
7244 | GDB_PROBE_NAME); | |
7245 | if (result < 0) | |
7246 | warning ("could not disable marker %s/%s", | |
7247 | iter.marker->channel, iter.marker->name); | |
7248 | break; | |
7249 | } | |
7250 | } | |
7251 | ||
7252 | /* Connect the GDB probe to a marker at a given address. */ | |
7253 | ||
7254 | static int | |
7255 | probe_marker_at (char *packet) | |
7256 | { | |
7257 | char *p = packet; | |
7258 | ULONGEST address; | |
7259 | struct marker_iter iter; | |
7260 | struct marker *m; | |
7261 | ||
7262 | p += sizeof ("probe_marker_at:") - 1; | |
7263 | ||
7264 | p = unpack_varlen_hex (p, &address); | |
7265 | ||
7266 | USTF(marker_iter_reset) (&iter); | |
7267 | ||
7268 | for (USTF(marker_iter_start) (&iter), m = iter.marker; | |
7269 | m != NULL; | |
7270 | USTF(marker_iter_next) (&iter), m = iter.marker) | |
7271 | if ((uintptr_t ) m->location == address) | |
7272 | { | |
7273 | int result; | |
7274 | ||
7275 | trace_debug ("found marker for address. " | |
7276 | "ltt_marker_connect (marker = %s/%s)", | |
7277 | m->channel, m->name); | |
7278 | ||
493e2a69 MS |
7279 | result = USTF(ltt_marker_connect) (m->channel, m->name, |
7280 | GDB_PROBE_NAME); | |
0fb4aa4b PA |
7281 | if (result && result != -EEXIST) |
7282 | trace_debug ("ltt_marker_connect (marker = %s/%s, errno = %d)", | |
7283 | m->channel, m->name, -result); | |
7284 | ||
7285 | if (result < 0) | |
7286 | { | |
7287 | sprintf (packet, "E.could not connect marker: channel=%s, name=%s", | |
7288 | m->channel, m->name); | |
7289 | return -1; | |
7290 | } | |
7291 | ||
7292 | strcpy (packet, "OK"); | |
7293 | return 0; | |
7294 | } | |
7295 | ||
7296 | sprintf (packet, "E.no marker found at 0x%s", paddress (address)); | |
7297 | return -1; | |
7298 | } | |
7299 | ||
7300 | static int | |
7301 | cmd_qtstmat (char *packet) | |
7302 | { | |
7303 | char *p = packet; | |
7304 | ULONGEST address; | |
7305 | struct marker_iter iter; | |
7306 | struct marker *m; | |
7307 | ||
7308 | p += sizeof ("qTSTMat:") - 1; | |
7309 | ||
7310 | p = unpack_varlen_hex (p, &address); | |
7311 | ||
7312 | USTF(marker_iter_reset) (&iter); | |
7313 | ||
7314 | for (USTF(marker_iter_start) (&iter), m = iter.marker; | |
7315 | m != NULL; | |
7316 | USTF(marker_iter_next) (&iter), m = iter.marker) | |
7317 | if ((uintptr_t ) m->location == address) | |
7318 | { | |
7319 | response_ust_marker (packet, m); | |
7320 | return 0; | |
7321 | } | |
7322 | ||
7323 | strcpy (packet, "l"); | |
7324 | return -1; | |
7325 | } | |
7326 | ||
7327 | static void * | |
7328 | gdb_ust_thread (void *arg) | |
7329 | { | |
7330 | int listen_fd; | |
7331 | ||
7332 | while (1) | |
7333 | { | |
7334 | listen_fd = gdb_ust_socket_init (); | |
7335 | ||
7336 | #ifdef SYS_gettid | |
7337 | if (helper_thread_id == 0) | |
7338 | helper_thread_id = syscall (SYS_gettid); | |
7339 | #endif | |
7340 | ||
7341 | if (listen_fd == -1) | |
7342 | { | |
7343 | warning ("could not create sync socket\n"); | |
7344 | break; | |
7345 | } | |
7346 | ||
7347 | while (1) | |
7348 | { | |
7349 | socklen_t tmp; | |
7350 | struct sockaddr_un sockaddr; | |
7351 | int fd; | |
7352 | char buf[1]; | |
7353 | int ret; | |
7354 | ||
7355 | tmp = sizeof (sockaddr); | |
7356 | ||
7357 | do | |
7358 | { | |
7359 | fd = accept (listen_fd, &sockaddr, &tmp); | |
7360 | } | |
7361 | /* It seems an ERESTARTSYS can escape out of accept. */ | |
7362 | while (fd == -512 || (fd == -1 && errno == EINTR)); | |
7363 | ||
7364 | if (fd < 0) | |
7365 | { | |
7366 | warning ("Accept returned %d, error: %s\n", | |
7367 | fd, strerror (errno)); | |
7368 | break; | |
7369 | } | |
7370 | ||
7371 | do | |
7372 | { | |
7373 | ret = read (fd, buf, 1); | |
7374 | } while (ret == -1 && errno == EINTR); | |
7375 | ||
7376 | if (ret == -1) | |
7377 | { | |
7378 | warning ("reading socket (fd=%d) failed with %s", | |
7379 | fd, strerror (errno)); | |
7380 | close (fd); | |
7381 | break; | |
7382 | } | |
7383 | ||
7384 | if (cmd_buf[0]) | |
7385 | { | |
7386 | if (strcmp ("qTfSTM", cmd_buf) == 0) | |
7387 | { | |
7388 | cmd_qtfstm (cmd_buf); | |
7389 | } | |
7390 | else if (strcmp ("qTsSTM", cmd_buf) == 0) | |
7391 | { | |
7392 | cmd_qtsstm (cmd_buf); | |
7393 | } | |
7394 | else if (strncmp ("unprobe_marker_at:", | |
7395 | cmd_buf, | |
7396 | sizeof ("unprobe_marker_at:") - 1) == 0) | |
7397 | { | |
7398 | unprobe_marker_at (cmd_buf); | |
7399 | } | |
7400 | else if (strncmp ("probe_marker_at:", | |
7401 | cmd_buf, | |
7402 | sizeof ("probe_marker_at:") - 1) == 0) | |
7403 | { | |
7404 | probe_marker_at (cmd_buf); | |
7405 | } | |
7406 | else if (strncmp ("qTSTMat:", | |
7407 | cmd_buf, | |
7408 | sizeof ("qTSTMat:") - 1) == 0) | |
7409 | { | |
7410 | cmd_qtstmat (cmd_buf); | |
7411 | } | |
7412 | else if (strcmp (cmd_buf, "help") == 0) | |
7413 | { | |
7414 | strcpy (cmd_buf, "for help, press F1\n"); | |
7415 | } | |
7416 | else | |
7417 | strcpy (cmd_buf, ""); | |
7418 | } | |
7419 | ||
7420 | write (fd, buf, 1); | |
7421 | close (fd); | |
7422 | } | |
7423 | } | |
7424 | ||
7425 | return NULL; | |
7426 | } | |
7427 | ||
7428 | #include <signal.h> | |
7429 | ||
7430 | static void | |
7431 | gdb_ust_init (void) | |
7432 | { | |
7433 | int res; | |
7434 | pthread_t thread; | |
7435 | sigset_t new_mask; | |
7436 | sigset_t orig_mask; | |
7437 | ||
7438 | if (!dlsym_ust ()) | |
7439 | return; | |
7440 | ||
7441 | /* We want the helper thread to be as transparent as possible, so | |
7442 | have it inherit an all-signals-blocked mask. */ | |
7443 | ||
7444 | sigfillset (&new_mask); | |
7445 | res = pthread_sigmask (SIG_SETMASK, &new_mask, &orig_mask); | |
7446 | if (res) | |
7447 | fatal ("pthread_sigmask (1) failed: %s", strerror (res)); | |
7448 | ||
7449 | res = pthread_create (&thread, | |
7450 | NULL, | |
7451 | gdb_ust_thread, | |
7452 | NULL); | |
7453 | ||
7454 | res = pthread_sigmask (SIG_SETMASK, &orig_mask, NULL); | |
7455 | if (res) | |
7456 | fatal ("pthread_sigmask (2) failed: %s", strerror (res)); | |
7457 | ||
7458 | while (helper_thread_id == 0) | |
7459 | usleep (1); | |
7460 | ||
7461 | USTF(ltt_probe_register) (&gdb_ust_probe); | |
7462 | } | |
7463 | ||
7464 | #endif /* HAVE_UST */ | |
7465 | ||
7466 | #include <sys/mman.h> | |
7467 | #include <fcntl.h> | |
7468 | ||
7469 | IP_AGENT_EXPORT char *gdb_tp_heap_buffer; | |
7470 | IP_AGENT_EXPORT char *gdb_jump_pad_buffer; | |
7471 | IP_AGENT_EXPORT char *gdb_jump_pad_buffer_end; | |
7472 | ||
7473 | static void __attribute__ ((constructor)) | |
7474 | initialize_tracepoint_ftlib (void) | |
7475 | { | |
7476 | initialize_tracepoint (); | |
7477 | ||
7478 | #ifdef HAVE_UST | |
7479 | gdb_ust_init (); | |
7480 | #endif | |
7481 | } | |
7482 | ||
7483 | #endif /* IN_PROCESS_AGENT */ | |
fa593d66 | 7484 | |
219f2f23 PA |
7485 | static LONGEST |
7486 | tsv_get_timestamp (void) | |
7487 | { | |
7488 | struct timeval tv; | |
7489 | ||
7490 | if (gettimeofday (&tv, 0) != 0) | |
7491 | return -1; | |
7492 | else | |
7493 | return (LONGEST) tv.tv_sec * 1000000 + tv.tv_usec; | |
7494 | } | |
7495 | ||
7496 | void | |
7497 | initialize_tracepoint (void) | |
7498 | { | |
7499 | /* There currently no way to change the buffer size. */ | |
7500 | const int sizeOfBuffer = 5 * 1024 * 1024; | |
7501 | unsigned char *buf = xmalloc (sizeOfBuffer); | |
7502 | init_trace_buffer (buf, sizeOfBuffer); | |
7503 | ||
7504 | /* Wire trace state variable 1 to be the timestamp. This will be | |
7505 | uploaded to GDB upon connection and become one of its trace state | |
7506 | variables. (In case you're wondering, if GDB already has a trace | |
7507 | variable numbered 1, it will be renumbered.) */ | |
fa593d66 | 7508 | create_trace_state_variable (1, 0); |
219f2f23 PA |
7509 | set_trace_state_variable_name (1, "trace_timestamp"); |
7510 | set_trace_state_variable_getter (1, tsv_get_timestamp); | |
fa593d66 PA |
7511 | |
7512 | #ifdef IN_PROCESS_AGENT | |
7513 | { | |
7514 | int pagesize; | |
7515 | pagesize = sysconf (_SC_PAGE_SIZE); | |
7516 | if (pagesize == -1) | |
7517 | fatal ("sysconf"); | |
7518 | ||
7519 | gdb_tp_heap_buffer = xmalloc (5 * 1024 * 1024); | |
7520 | ||
7521 | /* Allocate scratch buffer aligned on a page boundary. */ | |
7522 | gdb_jump_pad_buffer = memalign (pagesize, pagesize * 20); | |
7523 | gdb_jump_pad_buffer_end = gdb_jump_pad_buffer + pagesize * 20; | |
7524 | ||
7525 | /* Make it writable and executable. */ | |
7526 | if (mprotect (gdb_jump_pad_buffer, pagesize * 20, | |
7527 | PROT_READ | PROT_WRITE | PROT_EXEC) != 0) | |
7528 | fatal ("\ | |
7529 | initialize_tracepoint: mprotect(%p, %d, PROT_READ|PROT_EXEC) failed with %s", | |
7530 | gdb_jump_pad_buffer, pagesize * 20, strerror (errno)); | |
7531 | } | |
7532 | ||
7533 | initialize_low_tracepoint (); | |
7534 | #endif | |
219f2f23 | 7535 | } |