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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 | |
405f8e94 SS |
113 | # define gdb_trampoline_buffer gdb_agent_gdb_trampoline_buffer |
114 | # define gdb_trampoline_buffer_end gdb_agent_gdb_trampoline_buffer_end | |
115 | # define gdb_trampoline_buffer_error gdb_agent_gdb_trampoline_buffer_error | |
fa593d66 PA |
116 | # define collecting gdb_agent_collecting |
117 | # define gdb_collect gdb_agent_gdb_collect | |
118 | # define stop_tracing gdb_agent_stop_tracing | |
119 | # define flush_trace_buffer gdb_agent_flush_trace_buffer | |
120 | # define about_to_request_buffer_space gdb_agent_about_to_request_buffer_space | |
121 | # define trace_buffer_is_full gdb_agent_trace_buffer_is_full | |
122 | # define stopping_tracepoint gdb_agent_stopping_tracepoint | |
123 | # define expr_eval_result gdb_agent_expr_eval_result | |
124 | # define error_tracepoint gdb_agent_error_tracepoint | |
125 | # define tracepoints gdb_agent_tracepoints | |
126 | # define tracing gdb_agent_tracing | |
127 | # define trace_buffer_ctrl gdb_agent_trace_buffer_ctrl | |
128 | # define trace_buffer_ctrl_curr gdb_agent_trace_buffer_ctrl_curr | |
129 | # define trace_buffer_lo gdb_agent_trace_buffer_lo | |
130 | # define trace_buffer_hi gdb_agent_trace_buffer_hi | |
131 | # define traceframe_read_count gdb_agent_traceframe_read_count | |
132 | # define traceframe_write_count gdb_agent_traceframe_write_count | |
133 | # define traceframes_created gdb_agent_traceframes_created | |
134 | # define trace_state_variables gdb_agent_trace_state_variables | |
6a271cae | 135 | # define get_raw_reg gdb_agent_get_raw_reg |
493e2a69 MS |
136 | # define get_trace_state_variable_value \ |
137 | gdb_agent_get_trace_state_variable_value | |
138 | # define set_trace_state_variable_value \ | |
139 | gdb_agent_set_trace_state_variable_value | |
0fb4aa4b PA |
140 | # define ust_loaded gdb_agent_ust_loaded |
141 | # define helper_thread_id gdb_agent_helper_thread_id | |
142 | # define cmd_buf gdb_agent_cmd_buf | |
fa593d66 PA |
143 | #endif |
144 | ||
145 | #ifndef IN_PROCESS_AGENT | |
146 | ||
147 | /* Addresses of in-process agent's symbols GDBserver cares about. */ | |
148 | ||
149 | struct ipa_sym_addresses | |
150 | { | |
151 | CORE_ADDR addr_gdb_tp_heap_buffer; | |
152 | CORE_ADDR addr_gdb_jump_pad_buffer; | |
153 | CORE_ADDR addr_gdb_jump_pad_buffer_end; | |
405f8e94 SS |
154 | CORE_ADDR addr_gdb_trampoline_buffer; |
155 | CORE_ADDR addr_gdb_trampoline_buffer_end; | |
156 | CORE_ADDR addr_gdb_trampoline_buffer_error; | |
fa593d66 PA |
157 | CORE_ADDR addr_collecting; |
158 | CORE_ADDR addr_gdb_collect; | |
159 | CORE_ADDR addr_stop_tracing; | |
160 | CORE_ADDR addr_flush_trace_buffer; | |
161 | CORE_ADDR addr_about_to_request_buffer_space; | |
162 | CORE_ADDR addr_trace_buffer_is_full; | |
163 | CORE_ADDR addr_stopping_tracepoint; | |
164 | CORE_ADDR addr_expr_eval_result; | |
165 | CORE_ADDR addr_error_tracepoint; | |
166 | CORE_ADDR addr_tracepoints; | |
167 | CORE_ADDR addr_tracing; | |
168 | CORE_ADDR addr_trace_buffer_ctrl; | |
169 | CORE_ADDR addr_trace_buffer_ctrl_curr; | |
170 | CORE_ADDR addr_trace_buffer_lo; | |
171 | CORE_ADDR addr_trace_buffer_hi; | |
172 | CORE_ADDR addr_traceframe_read_count; | |
173 | CORE_ADDR addr_traceframe_write_count; | |
174 | CORE_ADDR addr_traceframes_created; | |
175 | CORE_ADDR addr_trace_state_variables; | |
6a271cae PA |
176 | CORE_ADDR addr_get_raw_reg; |
177 | CORE_ADDR addr_get_trace_state_variable_value; | |
178 | CORE_ADDR addr_set_trace_state_variable_value; | |
0fb4aa4b PA |
179 | CORE_ADDR addr_ust_loaded; |
180 | CORE_ADDR addr_helper_thread_id; | |
181 | CORE_ADDR addr_cmd_buf; | |
fa593d66 PA |
182 | }; |
183 | ||
184 | #define STRINGIZE_1(STR) #STR | |
185 | #define STRINGIZE(STR) STRINGIZE_1(STR) | |
493e2a69 | 186 | #define IPA_SYM(SYM) \ |
fa593d66 PA |
187 | { \ |
188 | STRINGIZE (gdb_agent_ ## SYM), \ | |
189 | offsetof (struct ipa_sym_addresses, addr_ ## SYM) \ | |
190 | } | |
191 | ||
192 | static struct | |
193 | { | |
194 | const char *name; | |
195 | int offset; | |
196 | int required; | |
197 | } symbol_list[] = { | |
198 | IPA_SYM(gdb_tp_heap_buffer), | |
199 | IPA_SYM(gdb_jump_pad_buffer), | |
200 | IPA_SYM(gdb_jump_pad_buffer_end), | |
405f8e94 SS |
201 | IPA_SYM(gdb_trampoline_buffer), |
202 | IPA_SYM(gdb_trampoline_buffer_end), | |
203 | IPA_SYM(gdb_trampoline_buffer_error), | |
fa593d66 PA |
204 | IPA_SYM(collecting), |
205 | IPA_SYM(gdb_collect), | |
206 | IPA_SYM(stop_tracing), | |
207 | IPA_SYM(flush_trace_buffer), | |
208 | IPA_SYM(about_to_request_buffer_space), | |
209 | IPA_SYM(trace_buffer_is_full), | |
210 | IPA_SYM(stopping_tracepoint), | |
211 | IPA_SYM(expr_eval_result), | |
212 | IPA_SYM(error_tracepoint), | |
213 | IPA_SYM(tracepoints), | |
214 | IPA_SYM(tracing), | |
215 | IPA_SYM(trace_buffer_ctrl), | |
216 | IPA_SYM(trace_buffer_ctrl_curr), | |
217 | IPA_SYM(trace_buffer_lo), | |
218 | IPA_SYM(trace_buffer_hi), | |
219 | IPA_SYM(traceframe_read_count), | |
220 | IPA_SYM(traceframe_write_count), | |
221 | IPA_SYM(traceframes_created), | |
222 | IPA_SYM(trace_state_variables), | |
6a271cae PA |
223 | IPA_SYM(get_raw_reg), |
224 | IPA_SYM(get_trace_state_variable_value), | |
225 | IPA_SYM(set_trace_state_variable_value), | |
0fb4aa4b PA |
226 | IPA_SYM(ust_loaded), |
227 | IPA_SYM(helper_thread_id), | |
228 | IPA_SYM(cmd_buf), | |
fa593d66 PA |
229 | }; |
230 | ||
231 | struct ipa_sym_addresses ipa_sym_addrs; | |
232 | ||
233 | int all_tracepoint_symbols_looked_up; | |
234 | ||
235 | int | |
236 | in_process_agent_loaded (void) | |
237 | { | |
238 | return all_tracepoint_symbols_looked_up; | |
239 | } | |
240 | ||
241 | static int read_inferior_integer (CORE_ADDR symaddr, int *val); | |
242 | ||
0fb4aa4b PA |
243 | /* Returns true if both the in-process agent library and the static |
244 | tracepoints libraries are loaded in the inferior. */ | |
245 | ||
246 | static int | |
247 | in_process_agent_loaded_ust (void) | |
248 | { | |
249 | int loaded = 0; | |
250 | ||
251 | if (!in_process_agent_loaded ()) | |
252 | { | |
253 | warning ("In-process agent not loaded"); | |
254 | return 0; | |
255 | } | |
256 | ||
257 | if (read_inferior_integer (ipa_sym_addrs.addr_ust_loaded, &loaded)) | |
258 | { | |
259 | warning ("Error reading ust_loaded in lib"); | |
260 | return 0; | |
261 | } | |
262 | ||
263 | return loaded; | |
264 | } | |
265 | ||
fa593d66 PA |
266 | static void |
267 | write_e_ipa_not_loaded (char *buffer) | |
268 | { | |
269 | sprintf (buffer, | |
270 | "E.In-process agent library not loaded in process. " | |
0fb4aa4b PA |
271 | "Fast and static tracepoints unavailable."); |
272 | } | |
273 | ||
274 | /* Write an error to BUFFER indicating that UST isn't loaded in the | |
275 | inferior. */ | |
276 | ||
277 | static void | |
278 | write_e_ust_not_loaded (char *buffer) | |
279 | { | |
280 | #ifdef HAVE_UST | |
281 | sprintf (buffer, | |
282 | "E.UST library not loaded in process. " | |
283 | "Static tracepoints unavailable."); | |
284 | #else | |
285 | sprintf (buffer, "E.GDBserver was built without static tracepoints support"); | |
286 | #endif | |
fa593d66 PA |
287 | } |
288 | ||
0fb4aa4b PA |
289 | /* If the in-process agent library isn't loaded in the inferior, write |
290 | an error to BUFFER, and return 1. Otherwise, return 0. */ | |
291 | ||
fa593d66 PA |
292 | static int |
293 | maybe_write_ipa_not_loaded (char *buffer) | |
294 | { | |
295 | if (!in_process_agent_loaded ()) | |
296 | { | |
297 | write_e_ipa_not_loaded (buffer); | |
298 | return 1; | |
299 | } | |
300 | return 0; | |
301 | } | |
302 | ||
0fb4aa4b PA |
303 | /* If the in-process agent library and the ust (static tracepoints) |
304 | library aren't loaded in the inferior, write an error to BUFFER, | |
305 | and return 1. Otherwise, return 0. */ | |
306 | ||
307 | static int | |
308 | maybe_write_ipa_ust_not_loaded (char *buffer) | |
309 | { | |
310 | if (!in_process_agent_loaded ()) | |
311 | { | |
312 | write_e_ipa_not_loaded (buffer); | |
313 | return 1; | |
314 | } | |
315 | else if (!in_process_agent_loaded_ust ()) | |
316 | { | |
317 | write_e_ust_not_loaded (buffer); | |
318 | return 1; | |
319 | } | |
320 | return 0; | |
321 | } | |
322 | ||
fa593d66 PA |
323 | /* Cache all future symbols that the tracepoints module might request. |
324 | We can not request symbols at arbitrary states in the remote | |
325 | protocol, only when the client tells us that new symbols are | |
326 | available. So when we load the in-process library, make sure to | |
327 | check the entire list. */ | |
328 | ||
329 | void | |
330 | tracepoint_look_up_symbols (void) | |
331 | { | |
fa593d66 PA |
332 | int i; |
333 | ||
334 | if (all_tracepoint_symbols_looked_up) | |
335 | return; | |
336 | ||
fa593d66 PA |
337 | for (i = 0; i < sizeof (symbol_list) / sizeof (symbol_list[0]); i++) |
338 | { | |
339 | CORE_ADDR *addrp = | |
340 | (CORE_ADDR *) ((char *) &ipa_sym_addrs + symbol_list[i].offset); | |
341 | ||
342 | if (look_up_one_symbol (symbol_list[i].name, addrp, 1) == 0) | |
343 | { | |
344 | if (debug_threads) | |
345 | fprintf (stderr, "symbol `%s' not found\n", symbol_list[i].name); | |
2275a1a7 | 346 | return; |
fa593d66 PA |
347 | } |
348 | } | |
349 | ||
2275a1a7 | 350 | all_tracepoint_symbols_looked_up = 1; |
fa593d66 PA |
351 | } |
352 | ||
353 | #endif | |
354 | ||
355 | /* GDBserver places a breakpoint on the IPA's version (which is a nop) | |
356 | of the "stop_tracing" function. When this breakpoint is hit, | |
357 | tracing stopped in the IPA for some reason. E.g., due to | |
358 | tracepoint reaching the pass count, hitting conditional expression | |
359 | evaluation error, etc. | |
360 | ||
361 | The IPA's trace buffer is never in circular tracing mode: instead, | |
362 | GDBserver's is, and whenever the in-process buffer fills, it calls | |
363 | "flush_trace_buffer", which triggers an internal breakpoint. | |
364 | GDBserver reacts to this breakpoint by pulling the meanwhile | |
365 | collected data. Old frames discarding is always handled on the | |
366 | GDBserver side. */ | |
367 | ||
368 | #ifdef IN_PROCESS_AGENT | |
369 | int debug_threads = 0; | |
370 | ||
371 | int | |
372 | read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) | |
373 | { | |
374 | memcpy (myaddr, (void *) (uintptr_t) memaddr, len); | |
375 | return 0; | |
376 | } | |
377 | ||
378 | /* Call this in the functions where GDBserver places a breakpoint, so | |
379 | that the compiler doesn't try to be clever and skip calling the | |
380 | function at all. This is necessary, even if we tell the compiler | |
381 | to not inline said functions. */ | |
382 | ||
383 | #if defined(__GNUC__) | |
384 | # define UNKNOWN_SIDE_EFFECTS() asm ("") | |
385 | #else | |
386 | # define UNKNOWN_SIDE_EFFECTS() do {} while (0) | |
387 | #endif | |
388 | ||
389 | IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE | |
390 | stop_tracing (void) | |
391 | { | |
392 | /* GDBserver places breakpoint here. */ | |
393 | UNKNOWN_SIDE_EFFECTS(); | |
394 | } | |
395 | ||
396 | IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE | |
397 | flush_trace_buffer (void) | |
398 | { | |
399 | /* GDBserver places breakpoint here. */ | |
400 | UNKNOWN_SIDE_EFFECTS(); | |
401 | } | |
402 | ||
403 | #endif | |
404 | ||
405 | #ifndef IN_PROCESS_AGENT | |
219f2f23 PA |
406 | static int |
407 | tracepoint_handler (CORE_ADDR address) | |
408 | { | |
409 | trace_debug ("tracepoint_handler: tracepoint at 0x%s hit", | |
410 | paddress (address)); | |
411 | return 0; | |
412 | } | |
413 | ||
fa593d66 PA |
414 | /* Breakpoint at "stop_tracing" in the inferior lib. */ |
415 | struct breakpoint *stop_tracing_bkpt; | |
416 | static int stop_tracing_handler (CORE_ADDR); | |
417 | ||
418 | /* Breakpoint at "flush_trace_buffer" in the inferior lib. */ | |
419 | struct breakpoint *flush_trace_buffer_bkpt; | |
420 | static int flush_trace_buffer_handler (CORE_ADDR); | |
421 | ||
422 | static void download_tracepoints (void); | |
423 | static void download_trace_state_variables (void); | |
424 | static void upload_fast_traceframes (void); | |
425 | ||
0fb4aa4b PA |
426 | static int run_inferior_command (char *cmd); |
427 | ||
fa593d66 PA |
428 | static int |
429 | read_inferior_integer (CORE_ADDR symaddr, int *val) | |
430 | { | |
431 | return read_inferior_memory (symaddr, (unsigned char *) val, | |
432 | sizeof (*val)); | |
433 | } | |
434 | ||
435 | static int | |
436 | read_inferior_uinteger (CORE_ADDR symaddr, unsigned int *val) | |
437 | { | |
438 | return read_inferior_memory (symaddr, (unsigned char *) val, | |
439 | sizeof (*val)); | |
440 | } | |
441 | ||
442 | static int | |
443 | read_inferior_data_pointer (CORE_ADDR symaddr, CORE_ADDR *val) | |
444 | { | |
445 | void *pval = (void *) (uintptr_t) val; | |
446 | int ret; | |
447 | ||
448 | ret = read_inferior_memory (symaddr, (unsigned char *) &pval, sizeof (pval)); | |
449 | *val = (uintptr_t) pval; | |
450 | return ret; | |
451 | } | |
452 | ||
453 | static int | |
454 | write_inferior_data_pointer (CORE_ADDR symaddr, CORE_ADDR val) | |
455 | { | |
456 | void *pval = (void *) (uintptr_t) val; | |
457 | return write_inferior_memory (symaddr, | |
458 | (unsigned char *) &pval, sizeof (pval)); | |
459 | } | |
460 | ||
461 | static int | |
462 | write_inferior_integer (CORE_ADDR symaddr, int val) | |
463 | { | |
464 | return write_inferior_memory (symaddr, (unsigned char *) &val, sizeof (val)); | |
465 | } | |
466 | ||
467 | static int | |
468 | write_inferior_uinteger (CORE_ADDR symaddr, unsigned int val) | |
469 | { | |
470 | return write_inferior_memory (symaddr, (unsigned char *) &val, sizeof (val)); | |
471 | } | |
472 | ||
473 | #endif | |
474 | ||
219f2f23 PA |
475 | /* This enum must exactly match what is documented in |
476 | gdb/doc/agentexpr.texi, including all the numerical values. */ | |
477 | ||
478 | enum gdb_agent_op | |
479 | { | |
94d5e490 TT |
480 | #define DEFOP(NAME, SIZE, DATA_SIZE, CONSUMED, PRODUCED, VALUE) \ |
481 | gdb_agent_op_ ## NAME = VALUE, | |
482 | #include "ax.def" | |
483 | #undef DEFOP | |
219f2f23 PA |
484 | gdb_agent_op_last |
485 | }; | |
486 | ||
487 | static const char *gdb_agent_op_names [gdb_agent_op_last] = | |
488 | { | |
94d5e490 TT |
489 | "?undef?" |
490 | #define DEFOP(NAME, SIZE, DATA_SIZE, CONSUMED, PRODUCED, VALUE) , # NAME | |
491 | #include "ax.def" | |
492 | #undef DEFOP | |
219f2f23 PA |
493 | }; |
494 | ||
6b9801d4 SS |
495 | static const unsigned char gdb_agent_op_sizes [gdb_agent_op_last] = |
496 | { | |
497 | 0 | |
498 | #define DEFOP(NAME, SIZE, DATA_SIZE, CONSUMED, PRODUCED, VALUE) , SIZE | |
499 | #include "ax.def" | |
500 | #undef DEFOP | |
501 | }; | |
502 | ||
219f2f23 PA |
503 | struct agent_expr |
504 | { | |
505 | int length; | |
506 | ||
507 | unsigned char *bytes; | |
508 | }; | |
509 | ||
510 | /* Base action. Concrete actions inherit this. */ | |
511 | ||
512 | struct tracepoint_action | |
513 | { | |
514 | char type; | |
515 | }; | |
516 | ||
517 | /* An 'M' (collect memory) action. */ | |
518 | struct collect_memory_action | |
519 | { | |
520 | struct tracepoint_action base; | |
521 | ||
522 | ULONGEST addr; | |
523 | ULONGEST len; | |
524 | int basereg; | |
525 | }; | |
526 | ||
527 | /* An 'R' (collect registers) action. */ | |
528 | ||
529 | struct collect_registers_action | |
530 | { | |
531 | struct tracepoint_action base; | |
532 | }; | |
533 | ||
534 | /* An 'X' (evaluate expression) action. */ | |
535 | ||
536 | struct eval_expr_action | |
537 | { | |
538 | struct tracepoint_action base; | |
539 | ||
540 | struct agent_expr *expr; | |
541 | }; | |
542 | ||
0fb4aa4b PA |
543 | /* An 'L' (collect static trace data) action. */ |
544 | struct collect_static_trace_data_action | |
545 | { | |
546 | struct tracepoint_action base; | |
547 | }; | |
548 | ||
219f2f23 PA |
549 | /* This structure describes a piece of the source-level definition of |
550 | the tracepoint. The contents are not interpreted by the target, | |
551 | but preserved verbatim for uploading upon reconnection. */ | |
552 | ||
553 | struct source_string | |
554 | { | |
555 | /* The type of string, such as "cond" for a conditional. */ | |
556 | char *type; | |
557 | ||
558 | /* The source-level string itself. For the sake of target | |
559 | debugging, we store it in plaintext, even though it is always | |
560 | transmitted in hex. */ | |
561 | char *str; | |
562 | ||
563 | /* Link to the next one in the list. We link them in the order | |
564 | received, in case some make up an ordered list of commands or | |
565 | some such. */ | |
566 | struct source_string *next; | |
567 | }; | |
568 | ||
fa593d66 PA |
569 | enum tracepoint_type |
570 | { | |
571 | /* Trap based tracepoint. */ | |
572 | trap_tracepoint, | |
573 | ||
574 | /* A fast tracepoint implemented with a jump instead of a trap. */ | |
575 | fast_tracepoint, | |
0fb4aa4b PA |
576 | |
577 | /* A static tracepoint, implemented by a program call into a tracing | |
578 | library. */ | |
579 | static_tracepoint | |
fa593d66 PA |
580 | }; |
581 | ||
219f2f23 PA |
582 | struct tracepoint_hit_ctx; |
583 | ||
6a271cae PA |
584 | typedef enum eval_result_type (*condfn) (struct tracepoint_hit_ctx *, |
585 | ULONGEST *); | |
586 | ||
219f2f23 PA |
587 | /* The definition of a tracepoint. */ |
588 | ||
589 | /* Tracepoints may have multiple locations, each at a different | |
590 | address. This can occur with optimizations, template | |
591 | instantiation, etc. Since the locations may be in different | |
592 | scopes, the conditions and actions may be different for each | |
593 | location. Our target version of tracepoints is more like GDB's | |
594 | notion of "breakpoint locations", but we have almost nothing that | |
595 | is not per-location, so we bother having two kinds of objects. The | |
596 | key consequence is that numbers are not unique, and that it takes | |
597 | both number and address to identify a tracepoint uniquely. */ | |
598 | ||
599 | struct tracepoint | |
600 | { | |
601 | /* The number of the tracepoint, as specified by GDB. Several | |
602 | tracepoint objects here may share a number. */ | |
603 | int number; | |
604 | ||
605 | /* Address at which the tracepoint is supposed to trigger. Several | |
606 | tracepoints may share an address. */ | |
607 | CORE_ADDR address; | |
608 | ||
fa593d66 PA |
609 | /* Tracepoint type. */ |
610 | enum tracepoint_type type; | |
611 | ||
219f2f23 PA |
612 | /* True if the tracepoint is currently enabled. */ |
613 | int enabled; | |
614 | ||
615 | /* The number of single steps that will be performed after each | |
616 | tracepoint hit. */ | |
617 | long step_count; | |
618 | ||
619 | /* The number of times the tracepoint may be hit before it will | |
620 | terminate the entire tracing run. */ | |
621 | long pass_count; | |
622 | ||
623 | /* Pointer to the agent expression that is the tracepoint's | |
624 | conditional, or NULL if the tracepoint is unconditional. */ | |
625 | struct agent_expr *cond; | |
626 | ||
627 | /* The list of actions to take when the tracepoint triggers. */ | |
628 | int numactions; | |
629 | struct tracepoint_action **actions; | |
219f2f23 PA |
630 | |
631 | /* Count of the times we've hit this tracepoint during the run. | |
632 | Note that while-stepping steps are not counted as "hits". */ | |
633 | long hit_count; | |
634 | ||
f196051f SS |
635 | /* Cached sum of the sizes of traceframes created by this point. */ |
636 | long traceframe_usage; | |
637 | ||
6a271cae PA |
638 | CORE_ADDR compiled_cond; |
639 | ||
fa593d66 PA |
640 | /* Link to the next tracepoint in the list. */ |
641 | struct tracepoint *next; | |
642 | ||
643 | #ifndef IN_PROCESS_AGENT | |
644 | /* The list of actions to take when the tracepoint triggers, in | |
645 | string/packet form. */ | |
646 | char **actions_str; | |
647 | ||
219f2f23 PA |
648 | /* The collection of strings that describe the tracepoint as it was |
649 | entered into GDB. These are not used by the target, but are | |
650 | reported back to GDB upon reconnection. */ | |
651 | struct source_string *source_strings; | |
652 | ||
fa593d66 PA |
653 | /* The number of bytes displaced by fast tracepoints. It may subsume |
654 | multiple instructions, for multi-byte fast tracepoints. This | |
655 | field is only valid for fast tracepoints. */ | |
656 | int orig_size; | |
657 | ||
658 | /* Only for fast tracepoints. */ | |
659 | CORE_ADDR obj_addr_on_target; | |
660 | ||
661 | /* Address range where the original instruction under a fast | |
662 | tracepoint was relocated to. (_end is actually one byte past | |
663 | the end). */ | |
664 | CORE_ADDR adjusted_insn_addr; | |
665 | CORE_ADDR adjusted_insn_addr_end; | |
666 | ||
667 | /* The address range of the piece of the jump pad buffer that was | |
668 | assigned to this fast tracepoint. (_end is actually one byte | |
669 | past the end).*/ | |
670 | CORE_ADDR jump_pad; | |
671 | CORE_ADDR jump_pad_end; | |
672 | ||
405f8e94 SS |
673 | /* The address range of the piece of the trampoline buffer that was |
674 | assigned to this fast tracepoint. (_end is actually one byte | |
675 | past the end). */ | |
676 | CORE_ADDR trampoline; | |
677 | CORE_ADDR trampoline_end; | |
678 | ||
fa593d66 PA |
679 | /* The list of actions to take while in a stepping loop. These |
680 | fields are only valid for patch-based tracepoints. */ | |
681 | int num_step_actions; | |
682 | struct tracepoint_action **step_actions; | |
683 | /* Same, but in string/packet form. */ | |
684 | char **step_actions_str; | |
685 | ||
686 | /* Handle returned by the breakpoint or tracepoint module when we | |
0fb4aa4b PA |
687 | inserted the trap or jump, or hooked into a static tracepoint. |
688 | NULL if we haven't inserted it yet. */ | |
219f2f23 | 689 | void *handle; |
fa593d66 | 690 | #endif |
219f2f23 | 691 | |
219f2f23 PA |
692 | }; |
693 | ||
fa593d66 PA |
694 | #ifndef IN_PROCESS_AGENT |
695 | ||
219f2f23 PA |
696 | /* Given `while-stepping', a thread may be collecting data for more |
697 | than one tracepoint simultaneously. On the other hand, the same | |
698 | tracepoint with a while-stepping action may be hit by more than one | |
699 | thread simultaneously (but not quite, each thread could be handling | |
700 | a different step). Each thread holds a list of these objects, | |
701 | representing the current step of each while-stepping action being | |
702 | collected. */ | |
703 | ||
704 | struct wstep_state | |
705 | { | |
706 | struct wstep_state *next; | |
707 | ||
708 | /* The tracepoint number. */ | |
709 | int tp_number; | |
710 | /* The tracepoint's address. */ | |
711 | CORE_ADDR tp_address; | |
712 | ||
713 | /* The number of the current step in this 'while-stepping' | |
714 | action. */ | |
715 | long current_step; | |
716 | }; | |
717 | ||
fa593d66 PA |
718 | #endif |
719 | ||
720 | /* The linked list of all tracepoints. Marked explicitly as used as | |
721 | the in-process library doesn't use it for the fast tracepoints | |
722 | support. */ | |
723 | IP_AGENT_EXPORT struct tracepoint *tracepoints ATTR_USED; | |
219f2f23 | 724 | |
fa593d66 | 725 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
726 | |
727 | /* Pointer to the last tracepoint in the list, new tracepoints are | |
728 | linked in at the end. */ | |
729 | ||
730 | static struct tracepoint *last_tracepoint; | |
fa593d66 | 731 | #endif |
219f2f23 PA |
732 | |
733 | /* The first tracepoint to exceed its pass count. */ | |
734 | ||
fa593d66 | 735 | IP_AGENT_EXPORT struct tracepoint *stopping_tracepoint; |
219f2f23 PA |
736 | |
737 | /* True if the trace buffer is full or otherwise no longer usable. */ | |
738 | ||
fa593d66 | 739 | IP_AGENT_EXPORT int trace_buffer_is_full; |
219f2f23 PA |
740 | |
741 | /* Enumeration of the different kinds of things that can happen during | |
742 | agent expression evaluation. */ | |
743 | ||
744 | enum eval_result_type | |
745 | { | |
746 | expr_eval_no_error, | |
747 | expr_eval_empty_expression, | |
748 | expr_eval_empty_stack, | |
749 | expr_eval_stack_overflow, | |
750 | expr_eval_stack_underflow, | |
751 | expr_eval_unhandled_opcode, | |
752 | expr_eval_unrecognized_opcode, | |
753 | expr_eval_divide_by_zero, | |
754 | expr_eval_invalid_goto | |
755 | }; | |
756 | ||
757 | static enum eval_result_type expr_eval_result = expr_eval_no_error; | |
758 | ||
fa593d66 PA |
759 | #ifndef IN_PROCESS_AGENT |
760 | ||
219f2f23 PA |
761 | static const char *eval_result_names[] = |
762 | { | |
763 | "terror:in the attic", /* this should never be reported */ | |
764 | "terror:empty expression", | |
765 | "terror:empty stack", | |
766 | "terror:stack overflow", | |
767 | "terror:stack underflow", | |
768 | "terror:unhandled opcode", | |
769 | "terror:unrecognized opcode", | |
770 | "terror:divide by zero" | |
771 | }; | |
772 | ||
fa593d66 PA |
773 | #endif |
774 | ||
219f2f23 PA |
775 | /* The tracepoint in which the error occurred. */ |
776 | ||
777 | static struct tracepoint *error_tracepoint; | |
778 | ||
779 | struct trace_state_variable | |
780 | { | |
781 | /* This is the name of the variable as used in GDB. The target | |
782 | doesn't use the name, but needs to have it for saving and | |
783 | reconnection purposes. */ | |
784 | char *name; | |
785 | ||
786 | /* This number identifies the variable uniquely. Numbers may be | |
787 | assigned either by the target (in the case of builtin variables), | |
788 | or by GDB, and are presumed unique during the course of a trace | |
789 | experiment. */ | |
790 | int number; | |
791 | ||
792 | /* The variable's initial value, a 64-bit signed integer always. */ | |
793 | LONGEST initial_value; | |
794 | ||
795 | /* The variable's value, a 64-bit signed integer always. */ | |
796 | LONGEST value; | |
797 | ||
798 | /* Pointer to a getter function, used to supply computed values. */ | |
799 | LONGEST (*getter) (void); | |
800 | ||
801 | /* Link to the next variable. */ | |
802 | struct trace_state_variable *next; | |
803 | }; | |
804 | ||
805 | /* Linked list of all trace state variables. */ | |
806 | ||
fa593d66 PA |
807 | #ifdef IN_PROCESS_AGENT |
808 | struct trace_state_variable *alloced_trace_state_variables; | |
809 | #endif | |
810 | ||
811 | IP_AGENT_EXPORT struct trace_state_variable *trace_state_variables; | |
219f2f23 PA |
812 | |
813 | /* The results of tracing go into a fixed-size space known as the | |
814 | "trace buffer". Because usage follows a limited number of | |
815 | patterns, we manage it ourselves rather than with malloc. Basic | |
816 | rules are that we create only one trace frame at a time, each is | |
817 | variable in size, they are never moved once created, and we only | |
818 | discard if we are doing a circular buffer, and then only the oldest | |
819 | ones. Each trace frame includes its own size, so we don't need to | |
820 | link them together, and the trace frame number is relative to the | |
821 | first one, so we don't need to record numbers. A trace frame also | |
822 | records the number of the tracepoint that created it. The data | |
823 | itself is a series of blocks, each introduced by a single character | |
824 | and with a defined format. Each type of block has enough | |
825 | type/length info to allow scanners to jump quickly from one block | |
826 | to the next without reading each byte in the block. */ | |
827 | ||
828 | /* Trace buffer management would be simple - advance a free pointer | |
829 | from beginning to end, then stop - were it not for the circular | |
830 | buffer option, which is a useful way to prevent a trace run from | |
831 | stopping prematurely because the buffer filled up. In the circular | |
832 | case, the location of the first trace frame (trace_buffer_start) | |
833 | moves as old trace frames are discarded. Also, since we grow trace | |
834 | frames incrementally as actions are performed, we wrap around to | |
835 | the beginning of the trace buffer. This is per-block, so each | |
836 | block within a trace frame remains contiguous. Things get messy | |
837 | when the wrapped-around trace frame is the one being discarded; the | |
838 | free space ends up in two parts at opposite ends of the buffer. */ | |
839 | ||
840 | #ifndef ATTR_PACKED | |
841 | # if defined(__GNUC__) | |
842 | # define ATTR_PACKED __attribute__ ((packed)) | |
843 | # else | |
844 | # define ATTR_PACKED /* nothing */ | |
845 | # endif | |
846 | #endif | |
847 | ||
848 | /* The data collected at a tracepoint hit. This object should be as | |
849 | small as possible, since there may be a great many of them. We do | |
850 | not need to keep a frame number, because they are all sequential | |
851 | and there are no deletions; so the Nth frame in the buffer is | |
852 | always frame number N. */ | |
853 | ||
854 | struct traceframe | |
855 | { | |
856 | /* Number of the tracepoint that collected this traceframe. A value | |
857 | of 0 indicates the current end of the trace buffer. We make this | |
858 | a 16-bit field because it's never going to happen that GDB's | |
859 | numbering of tracepoints reaches 32,000. */ | |
860 | int tpnum : 16; | |
861 | ||
862 | /* The size of the data in this trace frame. We limit this to 32 | |
863 | bits, even on a 64-bit target, because it's just implausible that | |
864 | one is validly going to collect 4 gigabytes of data at a single | |
865 | tracepoint hit. */ | |
866 | unsigned int data_size : 32; | |
867 | ||
868 | /* The base of the trace data, which is contiguous from this point. */ | |
869 | unsigned char data[0]; | |
870 | ||
fa593d66 | 871 | } ATTR_PACKED; |
219f2f23 PA |
872 | |
873 | /* The traceframe to be used as the source of data to send back to | |
874 | GDB. A value of -1 means to get data from the live program. */ | |
875 | ||
876 | int current_traceframe = -1; | |
877 | ||
878 | /* This flag is true if the trace buffer is circular, meaning that | |
879 | when it fills, the oldest trace frames are discarded in order to | |
880 | make room. */ | |
881 | ||
fa593d66 | 882 | #ifndef IN_PROCESS_AGENT |
219f2f23 | 883 | static int circular_trace_buffer; |
fa593d66 | 884 | #endif |
219f2f23 PA |
885 | |
886 | /* Pointer to the block of memory that traceframes all go into. */ | |
887 | ||
888 | static unsigned char *trace_buffer_lo; | |
889 | ||
890 | /* Pointer to the end of the trace buffer, more precisely to the byte | |
891 | after the end of the buffer. */ | |
892 | ||
893 | static unsigned char *trace_buffer_hi; | |
894 | ||
fa593d66 PA |
895 | /* Control structure holding the read/write/etc. pointers into the |
896 | trace buffer. We need more than one of these to implement a | |
897 | transaction-like mechanism to garantees that both GDBserver and the | |
898 | in-process agent can try to change the trace buffer | |
899 | simultaneously. */ | |
900 | ||
901 | struct trace_buffer_control | |
902 | { | |
903 | /* Pointer to the first trace frame in the buffer. In the | |
904 | non-circular case, this is equal to trace_buffer_lo, otherwise it | |
905 | moves around in the buffer. */ | |
906 | unsigned char *start; | |
907 | ||
908 | /* Pointer to the free part of the trace buffer. Note that we clear | |
909 | several bytes at and after this pointer, so that traceframe | |
910 | scans/searches terminate properly. */ | |
911 | unsigned char *free; | |
912 | ||
913 | /* Pointer to the byte after the end of the free part. Note that | |
914 | this may be smaller than trace_buffer_free in the circular case, | |
915 | and means that the free part is in two pieces. Initially it is | |
916 | equal to trace_buffer_hi, then is generally equivalent to | |
917 | trace_buffer_start. */ | |
918 | unsigned char *end_free; | |
919 | ||
920 | /* Pointer to the wraparound. If not equal to trace_buffer_hi, then | |
921 | this is the point at which the trace data breaks, and resumes at | |
922 | trace_buffer_lo. */ | |
923 | unsigned char *wrap; | |
924 | }; | |
925 | ||
926 | /* Same as above, to be used by GDBserver when updating the in-process | |
927 | agent. */ | |
928 | struct ipa_trace_buffer_control | |
929 | { | |
930 | uintptr_t start; | |
931 | uintptr_t free; | |
932 | uintptr_t end_free; | |
933 | uintptr_t wrap; | |
934 | }; | |
935 | ||
936 | ||
937 | /* We have possibly both GDBserver and an inferior thread accessing | |
938 | the same IPA trace buffer memory. The IPA is the producer (tries | |
939 | to put new frames in the buffer), while GDBserver occasionally | |
940 | consumes them, that is, flushes the IPA's buffer into its own | |
941 | buffer. Both sides need to update the trace buffer control | |
942 | pointers (current head, tail, etc.). We can't use a global lock to | |
943 | synchronize the accesses, as otherwise we could deadlock GDBserver | |
944 | (if the thread holding the lock stops for a signal, say). So | |
945 | instead of that, we use a transaction scheme where GDBserver writes | |
946 | always prevail over the IPAs writes, and, we have the IPA detect | |
947 | the commit failure/overwrite, and retry the whole attempt. This is | |
948 | mainly implemented by having a global token object that represents | |
949 | who wrote last to the buffer control structure. We need to freeze | |
950 | any inferior writing to the buffer while GDBserver touches memory, | |
951 | so that the inferior can correctly detect that GDBserver had been | |
952 | there, otherwise, it could mistakingly think its commit was | |
953 | successful; that's implemented by simply having GDBserver set a | |
954 | breakpoint the inferior hits if it is the critical region. | |
955 | ||
956 | There are three cycling trace buffer control structure copies | |
957 | (buffer head, tail, etc.), with the token object including an index | |
958 | indicating which is current live copy. The IPA tentatively builds | |
959 | an updated copy in a non-current control structure, while GDBserver | |
960 | always clobbers the current version directly. The IPA then tries | |
961 | to atomically "commit" its version; if GDBserver clobbered the | |
962 | structure meanwhile, that will fail, and the IPA restarts the | |
963 | allocation process. | |
964 | ||
965 | Listing the step in further detail, we have: | |
966 | ||
967 | In-process agent (producer): | |
968 | ||
969 | - passes by `about_to_request_buffer_space' breakpoint/lock | |
970 | ||
971 | - reads current token, extracts current trace buffer control index, | |
972 | and starts tentatively updating the rightmost one (0->1, 1->2, | |
973 | 2->0). Note that only one inferior thread is executing this code | |
974 | at any given time, due to an outer lock in the jump pads. | |
219f2f23 | 975 | |
fa593d66 | 976 | - updates counters, and tries to commit the token. |
219f2f23 | 977 | |
fa593d66 PA |
978 | - passes by second `about_to_request_buffer_space' breakpoint/lock, |
979 | leaving the sync region. | |
219f2f23 | 980 | |
fa593d66 | 981 | - checks if the update was effective. |
219f2f23 | 982 | |
fa593d66 PA |
983 | - if trace buffer was found full, hits flush_trace_buffer |
984 | breakpoint, and restarts later afterwards. | |
219f2f23 | 985 | |
fa593d66 | 986 | GDBserver (consumer): |
219f2f23 | 987 | |
fa593d66 PA |
988 | - sets `about_to_request_buffer_space' breakpoint/lock. |
989 | ||
990 | - updates the token unconditionally, using the current buffer | |
991 | control index, since it knows that the IP agent always writes to | |
992 | the rightmost, and due to the breakpoint, at most one IP thread | |
993 | can try to update the trace buffer concurrently to GDBserver, so | |
994 | there will be no danger of trace buffer control index wrap making | |
995 | the IPA write to the same index as GDBserver. | |
996 | ||
997 | - flushes the IP agent's trace buffer completely, and updates the | |
998 | current trace buffer control structure. GDBserver *always* wins. | |
999 | ||
1000 | - removes the `about_to_request_buffer_space' breakpoint. | |
1001 | ||
1002 | The token is stored in the `trace_buffer_ctrl_curr' variable. | |
1003 | Internally, it's bits are defined as: | |
1004 | ||
1005 | |-------------+-----+-------------+--------+-------------+--------------| | |
1006 | | Bit offsets | 31 | 30 - 20 | 19 | 18-8 | 7-0 | | |
1007 | |-------------+-----+-------------+--------+-------------+--------------| | |
1008 | | What | GSB | PC (11-bit) | unused | CC (11-bit) | TBCI (8-bit) | | |
1009 | |-------------+-----+-------------+--------+-------------+--------------| | |
1010 | ||
1011 | GSB - GDBserver Stamp Bit | |
1012 | PC - Previous Counter | |
1013 | CC - Current Counter | |
1014 | TBCI - Trace Buffer Control Index | |
1015 | ||
1016 | ||
1017 | An IPA update of `trace_buffer_ctrl_curr' does: | |
1018 | ||
1019 | - read CC from the current token, save as PC. | |
1020 | - updates pointers | |
1021 | - atomically tries to write PC+1,CC | |
1022 | ||
1023 | A GDBserver update of `trace_buffer_ctrl_curr' does: | |
1024 | ||
1025 | - reads PC and CC from the current token. | |
1026 | - updates pointers | |
1027 | - writes GSB,PC,CC | |
1028 | */ | |
1029 | ||
1030 | /* These are the bits of `trace_buffer_ctrl_curr' that are reserved | |
1031 | for the counters described below. The cleared bits are used to | |
1032 | hold the index of the items of the `trace_buffer_ctrl' array that | |
1033 | is "current". */ | |
1034 | #define GDBSERVER_FLUSH_COUNT_MASK 0xfffffff0 | |
1035 | ||
1036 | /* `trace_buffer_ctrl_curr' contains two counters. The `previous' | |
1037 | counter, and the `current' counter. */ | |
1038 | ||
1039 | #define GDBSERVER_FLUSH_COUNT_MASK_PREV 0x7ff00000 | |
1040 | #define GDBSERVER_FLUSH_COUNT_MASK_CURR 0x0007ff00 | |
1041 | ||
1042 | /* When GDBserver update the IP agent's `trace_buffer_ctrl_curr', it | |
1043 | always stamps this bit as set. */ | |
1044 | #define GDBSERVER_UPDATED_FLUSH_COUNT_BIT 0x80000000 | |
1045 | ||
1046 | #ifdef IN_PROCESS_AGENT | |
1047 | IP_AGENT_EXPORT struct trace_buffer_control trace_buffer_ctrl[3]; | |
1048 | IP_AGENT_EXPORT unsigned int trace_buffer_ctrl_curr; | |
1049 | ||
1050 | # define TRACE_BUFFER_CTRL_CURR \ | |
1051 | (trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK) | |
1052 | ||
1053 | #else | |
1054 | ||
1055 | /* The GDBserver side agent only needs one instance of this object, as | |
1056 | it doesn't need to sync with itself. Define it as array anyway so | |
1057 | that the rest of the code base doesn't need to care for the | |
1058 | difference. */ | |
1059 | struct trace_buffer_control trace_buffer_ctrl[1]; | |
1060 | # define TRACE_BUFFER_CTRL_CURR 0 | |
1061 | #endif | |
1062 | ||
1063 | /* These are convenience macros used to access the current trace | |
1064 | buffer control in effect. */ | |
1065 | #define trace_buffer_start (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].start) | |
1066 | #define trace_buffer_free (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].free) | |
1067 | #define trace_buffer_end_free \ | |
1068 | (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].end_free) | |
1069 | #define trace_buffer_wrap (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].wrap) | |
219f2f23 | 1070 | |
219f2f23 PA |
1071 | |
1072 | /* Macro that returns a pointer to the first traceframe in the buffer. */ | |
1073 | ||
1074 | #define FIRST_TRACEFRAME() ((struct traceframe *) trace_buffer_start) | |
1075 | ||
1076 | /* Macro that returns a pointer to the next traceframe in the buffer. | |
1077 | If the computed location is beyond the wraparound point, subtract | |
1078 | the offset of the wraparound. */ | |
1079 | ||
1080 | #define NEXT_TRACEFRAME_1(TF) \ | |
1081 | (((unsigned char *) (TF)) + sizeof (struct traceframe) + (TF)->data_size) | |
1082 | ||
1083 | #define NEXT_TRACEFRAME(TF) \ | |
1084 | ((struct traceframe *) (NEXT_TRACEFRAME_1 (TF) \ | |
1085 | - ((NEXT_TRACEFRAME_1 (TF) >= trace_buffer_wrap) \ | |
1086 | ? (trace_buffer_wrap - trace_buffer_lo) \ | |
1087 | : 0))) | |
1088 | ||
1089 | /* The difference between these counters represents the total number | |
fa593d66 PA |
1090 | of complete traceframes present in the trace buffer. The IP agent |
1091 | writes to the write count, GDBserver writes to read count. */ | |
219f2f23 | 1092 | |
fa593d66 PA |
1093 | IP_AGENT_EXPORT unsigned int traceframe_write_count; |
1094 | IP_AGENT_EXPORT unsigned int traceframe_read_count; | |
219f2f23 PA |
1095 | |
1096 | /* Convenience macro. */ | |
1097 | ||
1098 | #define traceframe_count \ | |
1099 | ((unsigned int) (traceframe_write_count - traceframe_read_count)) | |
1100 | ||
1101 | /* The count of all traceframes created in the current run, including | |
1102 | ones that were discarded to make room. */ | |
1103 | ||
fa593d66 PA |
1104 | IP_AGENT_EXPORT int traceframes_created; |
1105 | ||
1106 | #ifndef IN_PROCESS_AGENT | |
219f2f23 PA |
1107 | |
1108 | /* Read-only regions are address ranges whose contents don't change, | |
1109 | and so can be read from target memory even while looking at a trace | |
1110 | frame. Without these, disassembly for instance will likely fail, | |
1111 | because the program code is not usually collected into a trace | |
1112 | frame. This data structure does not need to be very complicated or | |
1113 | particularly efficient, it's only going to be used occasionally, | |
1114 | and only by some commands. */ | |
1115 | ||
1116 | struct readonly_region | |
1117 | { | |
1118 | /* The bounds of the region. */ | |
1119 | CORE_ADDR start, end; | |
1120 | ||
1121 | /* Link to the next one. */ | |
1122 | struct readonly_region *next; | |
1123 | }; | |
1124 | ||
1125 | /* Linked list of readonly regions. This list stays in effect from | |
1126 | one tstart to the next. */ | |
1127 | ||
1128 | static struct readonly_region *readonly_regions; | |
1129 | ||
fa593d66 PA |
1130 | #endif |
1131 | ||
219f2f23 PA |
1132 | /* The global that controls tracing overall. */ |
1133 | ||
fa593d66 PA |
1134 | IP_AGENT_EXPORT int tracing; |
1135 | ||
1136 | #ifndef IN_PROCESS_AGENT | |
8336d594 PA |
1137 | |
1138 | /* Controls whether tracing should continue after GDB disconnects. */ | |
1139 | ||
1140 | int disconnected_tracing; | |
219f2f23 PA |
1141 | |
1142 | /* The reason for the last tracing run to have stopped. We initialize | |
1143 | to a distinct string so that GDB can distinguish between "stopped | |
1144 | after running" and "stopped because never run" cases. */ | |
1145 | ||
1146 | static const char *tracing_stop_reason = "tnotrun"; | |
1147 | ||
1148 | static int tracing_stop_tpnum; | |
1149 | ||
f196051f SS |
1150 | /* 64-bit timestamps for the trace run's start and finish, expressed |
1151 | in microseconds from the Unix epoch. */ | |
1152 | ||
1153 | LONGEST tracing_start_time; | |
1154 | LONGEST tracing_stop_time; | |
1155 | ||
1156 | /* The (optional) user-supplied name of the user that started the run. | |
1157 | This is an arbitrary string, and may be NULL. */ | |
1158 | ||
1159 | char *tracing_user_name; | |
1160 | ||
1161 | /* Optional user-supplied text describing the run. This is | |
1162 | an arbitrary string, and may be NULL. */ | |
1163 | ||
1164 | char *tracing_notes; | |
1165 | ||
1166 | /* Optional user-supplied text explaining a tstop command. This is an | |
1167 | arbitrary string, and may be NULL. */ | |
1168 | ||
1169 | char *tracing_stop_note; | |
1170 | ||
fa593d66 PA |
1171 | #endif |
1172 | ||
219f2f23 PA |
1173 | /* Functions local to this file. */ |
1174 | ||
1175 | /* Base "class" for tracepoint type specific data to be passed down to | |
fa593d66 | 1176 | collect_data_at_tracepoint. */ |
219f2f23 PA |
1177 | struct tracepoint_hit_ctx |
1178 | { | |
fa593d66 | 1179 | enum tracepoint_type type; |
219f2f23 PA |
1180 | }; |
1181 | ||
fa593d66 PA |
1182 | #ifdef IN_PROCESS_AGENT |
1183 | ||
1184 | /* Fast/jump tracepoint specific data to be passed down to | |
219f2f23 | 1185 | collect_data_at_tracepoint. */ |
fa593d66 PA |
1186 | struct fast_tracepoint_ctx |
1187 | { | |
1188 | struct tracepoint_hit_ctx base; | |
1189 | ||
1190 | struct regcache regcache; | |
1191 | int regcache_initted; | |
1192 | unsigned char *regspace; | |
1193 | ||
1194 | unsigned char *regs; | |
1195 | struct tracepoint *tpoint; | |
1196 | }; | |
219f2f23 | 1197 | |
0fb4aa4b PA |
1198 | /* Static tracepoint specific data to be passed down to |
1199 | collect_data_at_tracepoint. */ | |
1200 | struct static_tracepoint_ctx | |
1201 | { | |
1202 | struct tracepoint_hit_ctx base; | |
1203 | ||
1204 | /* The regcache corresponding to the registers state at the time of | |
1205 | the tracepoint hit. Initialized lazily, from REGS. */ | |
1206 | struct regcache regcache; | |
1207 | int regcache_initted; | |
1208 | ||
1209 | /* The buffer space REGCACHE above uses. We use a separate buffer | |
1210 | instead of letting the regcache malloc for both signal safety and | |
1211 | performance reasons; this is allocated on the stack instead. */ | |
1212 | unsigned char *regspace; | |
1213 | ||
1214 | /* The register buffer as passed on by lttng/ust. */ | |
1215 | struct registers *regs; | |
1216 | ||
1217 | /* The "printf" formatter and the args the user passed to the marker | |
1218 | call. We use this to be able to collect "static trace data" | |
1219 | ($_sdata). */ | |
1220 | const char *fmt; | |
1221 | va_list *args; | |
1222 | ||
1223 | /* The GDB tracepoint matching the probed marker that was "hit". */ | |
1224 | struct tracepoint *tpoint; | |
1225 | }; | |
1226 | ||
fa593d66 PA |
1227 | #else |
1228 | ||
1229 | /* Static tracepoint specific data to be passed down to | |
1230 | collect_data_at_tracepoint. */ | |
219f2f23 PA |
1231 | struct trap_tracepoint_ctx |
1232 | { | |
1233 | struct tracepoint_hit_ctx base; | |
1234 | ||
1235 | struct regcache *regcache; | |
1236 | }; | |
1237 | ||
fa593d66 PA |
1238 | #endif |
1239 | ||
1240 | #ifndef IN_PROCESS_AGENT | |
219f2f23 PA |
1241 | static struct agent_expr *parse_agent_expr (char **actparm); |
1242 | static char *unparse_agent_expr (struct agent_expr *aexpr); | |
fa593d66 | 1243 | #endif |
219f2f23 PA |
1244 | static enum eval_result_type eval_agent_expr (struct tracepoint_hit_ctx *ctx, |
1245 | struct traceframe *tframe, | |
1246 | struct agent_expr *aexpr, | |
1247 | ULONGEST *rslt); | |
1248 | ||
1249 | static int agent_mem_read (struct traceframe *tframe, | |
1250 | unsigned char *to, CORE_ADDR from, ULONGEST len); | |
3065dfb6 SS |
1251 | static int agent_mem_read_string (struct traceframe *tframe, |
1252 | unsigned char *to, CORE_ADDR from, | |
1253 | ULONGEST len); | |
219f2f23 PA |
1254 | static int agent_tsv_read (struct traceframe *tframe, int n); |
1255 | ||
fa593d66 | 1256 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1257 | static CORE_ADDR traceframe_get_pc (struct traceframe *tframe); |
1258 | static int traceframe_read_tsv (int num, LONGEST *val); | |
fa593d66 | 1259 | #endif |
219f2f23 PA |
1260 | |
1261 | static int condition_true_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
1262 | struct tracepoint *tpoint); | |
1263 | ||
fa593d66 | 1264 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1265 | static void clear_readonly_regions (void); |
1266 | static void clear_installed_tracepoints (void); | |
fa593d66 | 1267 | #endif |
219f2f23 PA |
1268 | |
1269 | static void collect_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
1270 | CORE_ADDR stop_pc, | |
1271 | struct tracepoint *tpoint); | |
fa593d66 | 1272 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1273 | static void collect_data_at_step (struct tracepoint_hit_ctx *ctx, |
1274 | CORE_ADDR stop_pc, | |
1275 | struct tracepoint *tpoint, int current_step); | |
6a271cae PA |
1276 | static void compile_tracepoint_condition (struct tracepoint *tpoint, |
1277 | CORE_ADDR *jump_entry); | |
fa593d66 | 1278 | #endif |
219f2f23 PA |
1279 | static void do_action_at_tracepoint (struct tracepoint_hit_ctx *ctx, |
1280 | CORE_ADDR stop_pc, | |
1281 | struct tracepoint *tpoint, | |
1282 | struct traceframe *tframe, | |
1283 | struct tracepoint_action *taction); | |
1284 | ||
fa593d66 PA |
1285 | #ifndef IN_PROCESS_AGENT |
1286 | static struct tracepoint *fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR); | |
1e4d1764 YQ |
1287 | |
1288 | static void install_tracepoint (struct tracepoint *, char *own_buf); | |
1289 | static void download_tracepoint (struct tracepoint *); | |
405f8e94 | 1290 | static int install_fast_tracepoint (struct tracepoint *, char *errbuf); |
fa593d66 PA |
1291 | #endif |
1292 | ||
f196051f SS |
1293 | static LONGEST get_timestamp (void); |
1294 | ||
fa593d66 PA |
1295 | #if defined(__GNUC__) |
1296 | # define memory_barrier() asm volatile ("" : : : "memory") | |
1297 | #else | |
1298 | # define memory_barrier() do {} while (0) | |
1299 | #endif | |
1300 | ||
1301 | /* We only build the IPA if this builtin is supported, and there are | |
1302 | no uses of this in GDBserver itself, so we're safe in defining this | |
1303 | unconditionally. */ | |
1304 | #define cmpxchg(mem, oldval, newval) \ | |
1305 | __sync_val_compare_and_swap (mem, oldval, newval) | |
1306 | ||
0fb4aa4b PA |
1307 | /* The size in bytes of the buffer used to talk to the IPA helper |
1308 | thread. */ | |
1309 | #define CMD_BUF_SIZE 1024 | |
1310 | ||
219f2f23 PA |
1311 | /* Record that an error occurred during expression evaluation. */ |
1312 | ||
1313 | static void | |
1314 | record_tracepoint_error (struct tracepoint *tpoint, const char *which, | |
1315 | enum eval_result_type rtype) | |
1316 | { | |
1317 | trace_debug ("Tracepoint %d at %s %s eval reports error %d", | |
1318 | tpoint->number, paddress (tpoint->address), which, rtype); | |
1319 | ||
fa593d66 PA |
1320 | #ifdef IN_PROCESS_AGENT |
1321 | /* Only record the first error we get. */ | |
1322 | if (cmpxchg (&expr_eval_result, | |
1323 | expr_eval_no_error, | |
1324 | rtype) != expr_eval_no_error) | |
1325 | return; | |
1326 | #else | |
1327 | if (expr_eval_result != expr_eval_no_error) | |
1328 | return; | |
1329 | #endif | |
1330 | ||
219f2f23 PA |
1331 | error_tracepoint = tpoint; |
1332 | } | |
1333 | ||
1334 | /* Trace buffer management. */ | |
1335 | ||
1336 | static void | |
1337 | clear_trace_buffer (void) | |
1338 | { | |
1339 | trace_buffer_start = trace_buffer_lo; | |
1340 | trace_buffer_free = trace_buffer_lo; | |
1341 | trace_buffer_end_free = trace_buffer_hi; | |
1342 | trace_buffer_wrap = trace_buffer_hi; | |
1343 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1344 | ((struct traceframe *) trace_buffer_free)->tpnum = 0; | |
1345 | ((struct traceframe *) trace_buffer_free)->data_size = 0; | |
1346 | traceframe_read_count = traceframe_write_count = 0; | |
1347 | traceframes_created = 0; | |
1348 | } | |
1349 | ||
fa593d66 PA |
1350 | #ifndef IN_PROCESS_AGENT |
1351 | ||
1352 | static void | |
1353 | clear_inferior_trace_buffer (void) | |
1354 | { | |
1355 | CORE_ADDR ipa_trace_buffer_lo; | |
1356 | CORE_ADDR ipa_trace_buffer_hi; | |
1357 | struct traceframe ipa_traceframe = { 0 }; | |
1358 | struct ipa_trace_buffer_control ipa_trace_buffer_ctrl; | |
1359 | ||
1360 | read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_lo, | |
1361 | &ipa_trace_buffer_lo); | |
1362 | read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_hi, | |
1363 | &ipa_trace_buffer_hi); | |
1364 | ||
1365 | ipa_trace_buffer_ctrl.start = ipa_trace_buffer_lo; | |
1366 | ipa_trace_buffer_ctrl.free = ipa_trace_buffer_lo; | |
1367 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_hi; | |
1368 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
1369 | ||
1370 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1371 | write_inferior_memory (ipa_sym_addrs.addr_trace_buffer_ctrl, | |
1372 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
1373 | sizeof (ipa_trace_buffer_ctrl)); | |
1374 | ||
1375 | write_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, 0); | |
1376 | ||
1377 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1378 | write_inferior_memory (ipa_trace_buffer_lo, | |
1379 | (unsigned char *) &ipa_traceframe, | |
1380 | sizeof (ipa_traceframe)); | |
1381 | ||
1382 | write_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, 0); | |
1383 | write_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, 0); | |
1384 | write_inferior_integer (ipa_sym_addrs.addr_traceframes_created, 0); | |
1385 | } | |
1386 | ||
1387 | #endif | |
1388 | ||
219f2f23 PA |
1389 | static void |
1390 | init_trace_buffer (unsigned char *buf, int bufsize) | |
1391 | { | |
1392 | trace_buffer_lo = buf; | |
1393 | trace_buffer_hi = trace_buffer_lo + bufsize; | |
1394 | ||
1395 | clear_trace_buffer (); | |
1396 | } | |
1397 | ||
fa593d66 PA |
1398 | #ifdef IN_PROCESS_AGENT |
1399 | ||
1400 | IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE | |
1401 | about_to_request_buffer_space (void) | |
1402 | { | |
1403 | /* GDBserver places breakpoint here while it goes about to flush | |
1404 | data at random times. */ | |
1405 | UNKNOWN_SIDE_EFFECTS(); | |
1406 | } | |
1407 | ||
1408 | #endif | |
1409 | ||
219f2f23 PA |
1410 | /* Carve out a piece of the trace buffer, returning NULL in case of |
1411 | failure. */ | |
1412 | ||
1413 | static void * | |
1414 | trace_buffer_alloc (size_t amt) | |
1415 | { | |
1416 | unsigned char *rslt; | |
fa593d66 PA |
1417 | struct trace_buffer_control *tbctrl; |
1418 | unsigned int curr; | |
1419 | #ifdef IN_PROCESS_AGENT | |
1420 | unsigned int prev, prev_filtered; | |
1421 | unsigned int commit_count; | |
1422 | unsigned int commit; | |
1423 | unsigned int readout; | |
1424 | #else | |
219f2f23 PA |
1425 | struct traceframe *oldest; |
1426 | unsigned char *new_start; | |
fa593d66 | 1427 | #endif |
219f2f23 PA |
1428 | |
1429 | trace_debug ("Want to allocate %ld+%ld bytes in trace buffer", | |
1430 | (long) amt, (long) sizeof (struct traceframe)); | |
1431 | ||
1432 | /* Account for the EOB marker. */ | |
1433 | amt += sizeof (struct traceframe); | |
1434 | ||
fa593d66 PA |
1435 | #ifdef IN_PROCESS_AGENT |
1436 | again: | |
1437 | memory_barrier (); | |
1438 | ||
1439 | /* Read the current token and extract the index to try to write to, | |
1440 | storing it in CURR. */ | |
1441 | prev = trace_buffer_ctrl_curr; | |
1442 | prev_filtered = prev & ~GDBSERVER_FLUSH_COUNT_MASK; | |
1443 | curr = prev_filtered + 1; | |
1444 | if (curr > 2) | |
1445 | curr = 0; | |
1446 | ||
1447 | about_to_request_buffer_space (); | |
1448 | ||
1449 | /* Start out with a copy of the current state. GDBserver may be | |
1450 | midway writing to the PREV_FILTERED TBC, but, that's OK, we won't | |
1451 | be able to commit anyway if that happens. */ | |
1452 | trace_buffer_ctrl[curr] | |
1453 | = trace_buffer_ctrl[prev_filtered]; | |
1454 | trace_debug ("trying curr=%u", curr); | |
1455 | #else | |
1456 | /* The GDBserver's agent doesn't need all that syncing, and always | |
1457 | updates TCB 0 (there's only one, mind you). */ | |
1458 | curr = 0; | |
1459 | #endif | |
1460 | tbctrl = &trace_buffer_ctrl[curr]; | |
1461 | ||
219f2f23 PA |
1462 | /* Offsets are easier to grok for debugging than raw addresses, |
1463 | especially for the small trace buffer sizes that are useful for | |
1464 | testing. */ | |
fa593d66 PA |
1465 | trace_debug ("Trace buffer [%d] start=%d free=%d endfree=%d wrap=%d hi=%d", |
1466 | curr, | |
1467 | (int) (tbctrl->start - trace_buffer_lo), | |
1468 | (int) (tbctrl->free - trace_buffer_lo), | |
1469 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1470 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1471 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1472 | ||
1473 | /* The algorithm here is to keep trying to get a contiguous block of | |
1474 | the requested size, possibly discarding older traceframes to free | |
1475 | up space. Since free space might come in one or two pieces, | |
1476 | depending on whether discarded traceframes wrapped around at the | |
1477 | high end of the buffer, we test both pieces after each | |
1478 | discard. */ | |
1479 | while (1) | |
1480 | { | |
1481 | /* First, if we have two free parts, try the upper one first. */ | |
fa593d66 | 1482 | if (tbctrl->end_free < tbctrl->free) |
219f2f23 | 1483 | { |
fa593d66 | 1484 | if (tbctrl->free + amt <= trace_buffer_hi) |
219f2f23 PA |
1485 | /* We have enough in the upper part. */ |
1486 | break; | |
1487 | else | |
1488 | { | |
1489 | /* Our high part of free space wasn't enough. Give up | |
1490 | on it for now, set wraparound. We will recover the | |
1491 | space later, if/when the wrapped-around traceframe is | |
1492 | discarded. */ | |
1493 | trace_debug ("Upper part too small, setting wraparound"); | |
fa593d66 PA |
1494 | tbctrl->wrap = tbctrl->free; |
1495 | tbctrl->free = trace_buffer_lo; | |
219f2f23 PA |
1496 | } |
1497 | } | |
1498 | ||
1499 | /* The normal case. */ | |
fa593d66 | 1500 | if (tbctrl->free + amt <= tbctrl->end_free) |
219f2f23 PA |
1501 | break; |
1502 | ||
fa593d66 PA |
1503 | #ifdef IN_PROCESS_AGENT |
1504 | /* The IP Agent's buffer is always circular. It isn't used | |
1505 | currently, but `circular_trace_buffer' could represent | |
1506 | GDBserver's mode. If we didn't find space, ask GDBserver to | |
1507 | flush. */ | |
1508 | ||
1509 | flush_trace_buffer (); | |
1510 | memory_barrier (); | |
1511 | if (tracing) | |
1512 | { | |
1513 | trace_debug ("gdbserver flushed buffer, retrying"); | |
1514 | goto again; | |
1515 | } | |
1516 | ||
1517 | /* GDBserver cancelled the tracing. Bail out as well. */ | |
1518 | return NULL; | |
1519 | #else | |
219f2f23 PA |
1520 | /* If we're here, then neither part is big enough, and |
1521 | non-circular trace buffers are now full. */ | |
1522 | if (!circular_trace_buffer) | |
1523 | { | |
1524 | trace_debug ("Not enough space in the trace buffer"); | |
1525 | return NULL; | |
1526 | } | |
1527 | ||
1528 | trace_debug ("Need more space in the trace buffer"); | |
1529 | ||
1530 | /* If we have a circular buffer, we can try discarding the | |
1531 | oldest traceframe and see if that helps. */ | |
1532 | oldest = FIRST_TRACEFRAME (); | |
1533 | if (oldest->tpnum == 0) | |
1534 | { | |
1535 | /* Not good; we have no traceframes to free. Perhaps we're | |
1536 | asking for a block that is larger than the buffer? In | |
1537 | any case, give up. */ | |
1538 | trace_debug ("No traceframes to discard"); | |
1539 | return NULL; | |
1540 | } | |
1541 | ||
fa593d66 PA |
1542 | /* We don't run this code in the in-process agent currently. |
1543 | E.g., we could leave the in-process agent in autonomous | |
1544 | circular mode if we only have fast tracepoints. If we do | |
1545 | that, then this bit becomes racy with GDBserver, which also | |
1546 | writes to this counter. */ | |
219f2f23 PA |
1547 | --traceframe_write_count; |
1548 | ||
1549 | new_start = (unsigned char *) NEXT_TRACEFRAME (oldest); | |
1550 | /* If we freed the traceframe that wrapped around, go back | |
1551 | to the non-wrap case. */ | |
fa593d66 | 1552 | if (new_start < tbctrl->start) |
219f2f23 PA |
1553 | { |
1554 | trace_debug ("Discarding past the wraparound"); | |
fa593d66 | 1555 | tbctrl->wrap = trace_buffer_hi; |
219f2f23 | 1556 | } |
fa593d66 PA |
1557 | tbctrl->start = new_start; |
1558 | tbctrl->end_free = tbctrl->start; | |
219f2f23 PA |
1559 | |
1560 | trace_debug ("Discarded a traceframe\n" | |
fa593d66 PA |
1561 | "Trace buffer [%d], start=%d free=%d " |
1562 | "endfree=%d wrap=%d hi=%d", | |
1563 | curr, | |
1564 | (int) (tbctrl->start - trace_buffer_lo), | |
1565 | (int) (tbctrl->free - trace_buffer_lo), | |
1566 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1567 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1568 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1569 | ||
1570 | /* Now go back around the loop. The discard might have resulted | |
1571 | in either one or two pieces of free space, so we want to try | |
1572 | both before freeing any more traceframes. */ | |
fa593d66 | 1573 | #endif |
219f2f23 PA |
1574 | } |
1575 | ||
1576 | /* If we get here, we know we can provide the asked-for space. */ | |
1577 | ||
fa593d66 | 1578 | rslt = tbctrl->free; |
219f2f23 PA |
1579 | |
1580 | /* Adjust the request back down, now that we know we have space for | |
fa593d66 PA |
1581 | the marker, but don't commit to AMT yet, we may still need to |
1582 | restart the operation if GDBserver touches the trace buffer | |
1583 | (obviously only important in the in-process agent's version). */ | |
1584 | tbctrl->free += (amt - sizeof (struct traceframe)); | |
1585 | ||
1586 | /* Or not. If GDBserver changed the trace buffer behind our back, | |
1587 | we get to restart a new allocation attempt. */ | |
1588 | ||
1589 | #ifdef IN_PROCESS_AGENT | |
1590 | /* Build the tentative token. */ | |
2ece8244 YQ |
1591 | commit_count = (((prev & GDBSERVER_FLUSH_COUNT_MASK_CURR) + 0x100) |
1592 | & GDBSERVER_FLUSH_COUNT_MASK_CURR); | |
1593 | commit = (((prev & GDBSERVER_FLUSH_COUNT_MASK_CURR) << 12) | |
fa593d66 PA |
1594 | | commit_count |
1595 | | curr); | |
1596 | ||
1597 | /* Try to commit it. */ | |
1598 | readout = cmpxchg (&trace_buffer_ctrl_curr, prev, commit); | |
1599 | if (readout != prev) | |
1600 | { | |
1601 | trace_debug ("GDBserver has touched the trace buffer, restarting." | |
1602 | " (prev=%08x, commit=%08x, readout=%08x)", | |
1603 | prev, commit, readout); | |
1604 | goto again; | |
1605 | } | |
219f2f23 | 1606 | |
fa593d66 PA |
1607 | /* Hold your horses here. Even if that change was committed, |
1608 | GDBserver could come in, and clobber it. We need to hold to be | |
1609 | able to tell if GDBserver clobbers before or after we committed | |
1610 | the change. Whenever GDBserver goes about touching the IPA | |
1611 | buffer, it sets a breakpoint in this routine, so we have a sync | |
1612 | point here. */ | |
1613 | about_to_request_buffer_space (); | |
219f2f23 | 1614 | |
fa593d66 PA |
1615 | /* Check if the change has been effective, even if GDBserver stopped |
1616 | us at the breakpoint. */ | |
219f2f23 | 1617 | |
fa593d66 PA |
1618 | { |
1619 | unsigned int refetch; | |
219f2f23 | 1620 | |
fa593d66 PA |
1621 | memory_barrier (); |
1622 | ||
1623 | refetch = trace_buffer_ctrl_curr; | |
1624 | ||
2ece8244 YQ |
1625 | if (refetch == commit |
1626 | || ((refetch & GDBSERVER_FLUSH_COUNT_MASK_PREV) >> 12) == commit_count) | |
fa593d66 PA |
1627 | { |
1628 | /* effective */ | |
1629 | trace_debug ("change is effective: (prev=%08x, commit=%08x, " | |
1630 | "readout=%08x, refetch=%08x)", | |
1631 | prev, commit, readout, refetch); | |
1632 | } | |
1633 | else | |
1634 | { | |
1635 | trace_debug ("GDBserver has touched the trace buffer, not effective." | |
1636 | " (prev=%08x, commit=%08x, readout=%08x, refetch=%08x)", | |
1637 | prev, commit, readout, refetch); | |
1638 | goto again; | |
1639 | } | |
1640 | } | |
1641 | #endif | |
1642 | ||
1643 | /* We have a new piece of the trace buffer. Hurray! */ | |
1644 | ||
1645 | /* Add an EOB marker just past this allocation. */ | |
1646 | ((struct traceframe *) tbctrl->free)->tpnum = 0; | |
1647 | ((struct traceframe *) tbctrl->free)->data_size = 0; | |
1648 | ||
1649 | /* Adjust the request back down, now that we know we have space for | |
1650 | the marker. */ | |
1651 | amt -= sizeof (struct traceframe); | |
1652 | ||
1653 | if (debug_threads) | |
1654 | { | |
219f2f23 | 1655 | trace_debug ("Allocated %d bytes", (int) amt); |
fa593d66 PA |
1656 | trace_debug ("Trace buffer [%d] start=%d free=%d " |
1657 | "endfree=%d wrap=%d hi=%d", | |
1658 | curr, | |
1659 | (int) (tbctrl->start - trace_buffer_lo), | |
1660 | (int) (tbctrl->free - trace_buffer_lo), | |
1661 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1662 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1663 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1664 | } | |
1665 | ||
1666 | return rslt; | |
1667 | } | |
1668 | ||
fa593d66 PA |
1669 | #ifndef IN_PROCESS_AGENT |
1670 | ||
219f2f23 PA |
1671 | /* Return the total free space. This is not necessarily the largest |
1672 | block we can allocate, because of the two-part case. */ | |
1673 | ||
1674 | static int | |
1675 | free_space (void) | |
1676 | { | |
1677 | if (trace_buffer_free <= trace_buffer_end_free) | |
1678 | return trace_buffer_end_free - trace_buffer_free; | |
1679 | else | |
1680 | return ((trace_buffer_end_free - trace_buffer_lo) | |
1681 | + (trace_buffer_hi - trace_buffer_free)); | |
1682 | } | |
1683 | ||
1684 | /* An 'S' in continuation packets indicates remainder are for | |
1685 | while-stepping. */ | |
1686 | ||
1687 | static int seen_step_action_flag; | |
1688 | ||
1e4d1764 YQ |
1689 | /* Create a tracepoint (location) with given number and address. Add this |
1690 | new tracepoint to list and sort this list. */ | |
219f2f23 PA |
1691 | |
1692 | static struct tracepoint * | |
1693 | add_tracepoint (int num, CORE_ADDR addr) | |
1694 | { | |
1e4d1764 | 1695 | struct tracepoint *tpoint, **tp_next; |
219f2f23 PA |
1696 | |
1697 | tpoint = xmalloc (sizeof (struct tracepoint)); | |
1698 | tpoint->number = num; | |
1699 | tpoint->address = addr; | |
1700 | tpoint->numactions = 0; | |
1701 | tpoint->actions = NULL; | |
1702 | tpoint->actions_str = NULL; | |
1703 | tpoint->cond = NULL; | |
1704 | tpoint->num_step_actions = 0; | |
1705 | tpoint->step_actions = NULL; | |
1706 | tpoint->step_actions_str = NULL; | |
fa593d66 PA |
1707 | /* Start all off as regular (slow) tracepoints. */ |
1708 | tpoint->type = trap_tracepoint; | |
1709 | tpoint->orig_size = -1; | |
219f2f23 | 1710 | tpoint->source_strings = NULL; |
6a271cae | 1711 | tpoint->compiled_cond = 0; |
219f2f23 PA |
1712 | tpoint->handle = NULL; |
1713 | tpoint->next = NULL; | |
1714 | ||
1e4d1764 YQ |
1715 | /* Find a place to insert this tracepoint into list in order to keep |
1716 | the tracepoint list still in the ascending order. There may be | |
1717 | multiple tracepoints at the same address as TPOINT's, and this | |
1718 | guarantees TPOINT is inserted after all the tracepoints which are | |
1719 | set at the same address. For example, fast tracepoints A, B, C are | |
1720 | set at the same address, and D is to be insert at the same place as | |
1721 | well, | |
1722 | ||
1723 | -->| A |--> | B |-->| C |->... | |
1724 | ||
1725 | One jump pad was created for tracepoint A, B, and C, and the target | |
1726 | address of A is referenced/used in jump pad. So jump pad will let | |
1727 | inferior jump to A. If D is inserted in front of A, like this, | |
1728 | ||
1729 | -->| D |-->| A |--> | B |-->| C |->... | |
1730 | ||
1731 | without updating jump pad, D is not reachable during collect, which | |
1732 | is wrong. As we can see, the order of B, C and D doesn't matter, but | |
1733 | A should always be the `first' one. */ | |
1734 | for (tp_next = &tracepoints; | |
1735 | (*tp_next) != NULL && (*tp_next)->address <= tpoint->address; | |
1736 | tp_next = &(*tp_next)->next) | |
1737 | ; | |
1738 | tpoint->next = *tp_next; | |
1739 | *tp_next = tpoint; | |
219f2f23 PA |
1740 | last_tracepoint = tpoint; |
1741 | ||
1742 | seen_step_action_flag = 0; | |
1743 | ||
1744 | return tpoint; | |
1745 | } | |
1746 | ||
fa593d66 PA |
1747 | #ifndef IN_PROCESS_AGENT |
1748 | ||
219f2f23 PA |
1749 | /* Return the tracepoint with the given number and address, or NULL. */ |
1750 | ||
1751 | static struct tracepoint * | |
1752 | find_tracepoint (int id, CORE_ADDR addr) | |
1753 | { | |
1754 | struct tracepoint *tpoint; | |
1755 | ||
1756 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
1757 | if (tpoint->number == id && tpoint->address == addr) | |
1758 | return tpoint; | |
1759 | ||
1760 | return NULL; | |
1761 | } | |
1762 | ||
1763 | /* There may be several tracepoints with the same number (because they | |
1764 | are "locations", in GDB parlance); return the next one after the | |
1765 | given tracepoint, or search from the beginning of the list if the | |
1766 | first argument is NULL. */ | |
1767 | ||
1768 | static struct tracepoint * | |
1769 | find_next_tracepoint_by_number (struct tracepoint *prev_tp, int num) | |
1770 | { | |
1771 | struct tracepoint *tpoint; | |
1772 | ||
1773 | if (prev_tp) | |
1774 | tpoint = prev_tp->next; | |
1775 | else | |
1776 | tpoint = tracepoints; | |
1777 | for (; tpoint; tpoint = tpoint->next) | |
1778 | if (tpoint->number == num) | |
1779 | return tpoint; | |
1780 | ||
1781 | return NULL; | |
1782 | } | |
1783 | ||
fa593d66 PA |
1784 | #endif |
1785 | ||
219f2f23 PA |
1786 | static char * |
1787 | save_string (const char *str, size_t len) | |
1788 | { | |
1789 | char *s; | |
1790 | ||
1791 | s = xmalloc (len + 1); | |
1792 | memcpy (s, str, len); | |
1793 | s[len] = '\0'; | |
1794 | ||
1795 | return s; | |
1796 | } | |
1797 | ||
1798 | /* Append another action to perform when the tracepoint triggers. */ | |
1799 | ||
1800 | static void | |
1801 | add_tracepoint_action (struct tracepoint *tpoint, char *packet) | |
1802 | { | |
1803 | char *act; | |
1804 | ||
1805 | if (*packet == 'S') | |
1806 | { | |
1807 | seen_step_action_flag = 1; | |
1808 | ++packet; | |
1809 | } | |
1810 | ||
1811 | act = packet; | |
1812 | ||
1813 | while (*act) | |
1814 | { | |
1815 | char *act_start = act; | |
1816 | struct tracepoint_action *action = NULL; | |
1817 | ||
1818 | switch (*act) | |
1819 | { | |
1820 | case 'M': | |
1821 | { | |
1822 | struct collect_memory_action *maction; | |
1823 | ULONGEST basereg; | |
1824 | int is_neg; | |
1825 | ||
1826 | maction = xmalloc (sizeof *maction); | |
1827 | maction->base.type = *act; | |
1828 | action = &maction->base; | |
1829 | ||
1830 | ++act; | |
1831 | is_neg = (*act == '-'); | |
1832 | if (*act == '-') | |
1833 | ++act; | |
1834 | act = unpack_varlen_hex (act, &basereg); | |
1835 | ++act; | |
1836 | act = unpack_varlen_hex (act, &maction->addr); | |
1837 | ++act; | |
1838 | act = unpack_varlen_hex (act, &maction->len); | |
1839 | maction->basereg = (is_neg | |
1840 | ? - (int) basereg | |
1841 | : (int) basereg); | |
1842 | trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)", | |
1843 | pulongest (maction->len), | |
1844 | paddress (maction->addr), maction->basereg); | |
1845 | break; | |
1846 | } | |
1847 | case 'R': | |
1848 | { | |
1849 | struct collect_registers_action *raction; | |
1850 | ||
1851 | raction = xmalloc (sizeof *raction); | |
1852 | raction->base.type = *act; | |
1853 | action = &raction->base; | |
1854 | ||
1855 | trace_debug ("Want to collect registers"); | |
1856 | ++act; | |
1857 | /* skip past hex digits of mask for now */ | |
1858 | while (isxdigit(*act)) | |
1859 | ++act; | |
1860 | break; | |
1861 | } | |
0fb4aa4b PA |
1862 | case 'L': |
1863 | { | |
1864 | struct collect_static_trace_data_action *raction; | |
1865 | ||
1866 | raction = xmalloc (sizeof *raction); | |
1867 | raction->base.type = *act; | |
1868 | action = &raction->base; | |
1869 | ||
1870 | trace_debug ("Want to collect static trace data"); | |
1871 | ++act; | |
1872 | break; | |
1873 | } | |
219f2f23 PA |
1874 | case 'S': |
1875 | trace_debug ("Unexpected step action, ignoring"); | |
1876 | ++act; | |
1877 | break; | |
1878 | case 'X': | |
1879 | { | |
1880 | struct eval_expr_action *xaction; | |
1881 | ||
1882 | xaction = xmalloc (sizeof (*xaction)); | |
1883 | xaction->base.type = *act; | |
1884 | action = &xaction->base; | |
1885 | ||
1886 | trace_debug ("Want to evaluate expression"); | |
1887 | xaction->expr = parse_agent_expr (&act); | |
1888 | break; | |
1889 | } | |
1890 | default: | |
1891 | trace_debug ("unknown trace action '%c', ignoring...", *act); | |
1892 | break; | |
1893 | case '-': | |
1894 | break; | |
1895 | } | |
1896 | ||
1897 | if (action == NULL) | |
1898 | break; | |
1899 | ||
1900 | if (seen_step_action_flag) | |
1901 | { | |
1902 | tpoint->num_step_actions++; | |
1903 | ||
1904 | tpoint->step_actions | |
1905 | = xrealloc (tpoint->step_actions, | |
1906 | (sizeof (*tpoint->step_actions) | |
1907 | * tpoint->num_step_actions)); | |
1908 | tpoint->step_actions_str | |
1909 | = xrealloc (tpoint->step_actions_str, | |
1910 | (sizeof (*tpoint->step_actions_str) | |
1911 | * tpoint->num_step_actions)); | |
1912 | tpoint->step_actions[tpoint->num_step_actions - 1] = action; | |
1913 | tpoint->step_actions_str[tpoint->num_step_actions - 1] | |
1914 | = save_string (act_start, act - act_start); | |
1915 | } | |
1916 | else | |
1917 | { | |
1918 | tpoint->numactions++; | |
1919 | tpoint->actions | |
1920 | = xrealloc (tpoint->actions, | |
1921 | sizeof (*tpoint->actions) * tpoint->numactions); | |
1922 | tpoint->actions_str | |
1923 | = xrealloc (tpoint->actions_str, | |
1924 | sizeof (*tpoint->actions_str) * tpoint->numactions); | |
1925 | tpoint->actions[tpoint->numactions - 1] = action; | |
1926 | tpoint->actions_str[tpoint->numactions - 1] | |
1927 | = save_string (act_start, act - act_start); | |
1928 | } | |
1929 | } | |
1930 | } | |
1931 | ||
fa593d66 PA |
1932 | #endif |
1933 | ||
219f2f23 PA |
1934 | /* Find or create a trace state variable with the given number. */ |
1935 | ||
1936 | static struct trace_state_variable * | |
1937 | get_trace_state_variable (int num) | |
1938 | { | |
1939 | struct trace_state_variable *tsv; | |
1940 | ||
fa593d66 PA |
1941 | #ifdef IN_PROCESS_AGENT |
1942 | /* Search for an existing variable. */ | |
1943 | for (tsv = alloced_trace_state_variables; tsv; tsv = tsv->next) | |
1944 | if (tsv->number == num) | |
1945 | return tsv; | |
1946 | #endif | |
1947 | ||
219f2f23 PA |
1948 | /* Search for an existing variable. */ |
1949 | for (tsv = trace_state_variables; tsv; tsv = tsv->next) | |
1950 | if (tsv->number == num) | |
1951 | return tsv; | |
1952 | ||
1953 | return NULL; | |
1954 | } | |
1955 | ||
1956 | /* Find or create a trace state variable with the given number. */ | |
1957 | ||
1958 | static struct trace_state_variable * | |
fa593d66 | 1959 | create_trace_state_variable (int num, int gdb) |
219f2f23 PA |
1960 | { |
1961 | struct trace_state_variable *tsv; | |
1962 | ||
1963 | tsv = get_trace_state_variable (num); | |
1964 | if (tsv != NULL) | |
1965 | return tsv; | |
1966 | ||
1967 | /* Create a new variable. */ | |
1968 | tsv = xmalloc (sizeof (struct trace_state_variable)); | |
1969 | tsv->number = num; | |
1970 | tsv->initial_value = 0; | |
1971 | tsv->value = 0; | |
1972 | tsv->getter = NULL; | |
1973 | tsv->name = NULL; | |
fa593d66 PA |
1974 | #ifdef IN_PROCESS_AGENT |
1975 | if (!gdb) | |
1976 | { | |
1977 | tsv->next = alloced_trace_state_variables; | |
1978 | alloced_trace_state_variables = tsv; | |
1979 | } | |
1980 | else | |
1981 | #endif | |
1982 | { | |
1983 | tsv->next = trace_state_variables; | |
1984 | trace_state_variables = tsv; | |
1985 | } | |
219f2f23 PA |
1986 | return tsv; |
1987 | } | |
1988 | ||
6a271cae | 1989 | IP_AGENT_EXPORT LONGEST |
219f2f23 PA |
1990 | get_trace_state_variable_value (int num) |
1991 | { | |
1992 | struct trace_state_variable *tsv; | |
1993 | ||
1994 | tsv = get_trace_state_variable (num); | |
1995 | ||
1996 | if (!tsv) | |
1997 | { | |
1998 | trace_debug ("No trace state variable %d, skipping value get", num); | |
1999 | return 0; | |
2000 | } | |
2001 | ||
2002 | /* Call a getter function if we have one. While it's tempting to | |
2003 | set up something to only call the getter once per tracepoint hit, | |
2004 | it could run afoul of thread races. Better to let the getter | |
2005 | handle it directly, if necessary to worry about it. */ | |
2006 | if (tsv->getter) | |
2007 | tsv->value = (tsv->getter) (); | |
2008 | ||
2009 | trace_debug ("get_trace_state_variable_value(%d) ==> %s", | |
2010 | num, plongest (tsv->value)); | |
2011 | ||
2012 | return tsv->value; | |
2013 | } | |
2014 | ||
6a271cae | 2015 | IP_AGENT_EXPORT void |
219f2f23 PA |
2016 | set_trace_state_variable_value (int num, LONGEST val) |
2017 | { | |
2018 | struct trace_state_variable *tsv; | |
2019 | ||
2020 | tsv = get_trace_state_variable (num); | |
2021 | ||
2022 | if (!tsv) | |
2023 | { | |
2024 | trace_debug ("No trace state variable %d, skipping value set", num); | |
2025 | return; | |
2026 | } | |
2027 | ||
2028 | tsv->value = val; | |
2029 | } | |
2030 | ||
2031 | static void | |
2032 | set_trace_state_variable_name (int num, const char *name) | |
2033 | { | |
2034 | struct trace_state_variable *tsv; | |
2035 | ||
2036 | tsv = get_trace_state_variable (num); | |
2037 | ||
2038 | if (!tsv) | |
2039 | { | |
2040 | trace_debug ("No trace state variable %d, skipping name set", num); | |
2041 | return; | |
2042 | } | |
2043 | ||
2044 | tsv->name = (char *) name; | |
2045 | } | |
2046 | ||
2047 | static void | |
2048 | set_trace_state_variable_getter (int num, LONGEST (*getter) (void)) | |
2049 | { | |
2050 | struct trace_state_variable *tsv; | |
2051 | ||
2052 | tsv = get_trace_state_variable (num); | |
2053 | ||
2054 | if (!tsv) | |
2055 | { | |
2056 | trace_debug ("No trace state variable %d, skipping getter set", num); | |
2057 | return; | |
2058 | } | |
2059 | ||
2060 | tsv->getter = getter; | |
2061 | } | |
2062 | ||
2063 | /* Add a raw traceframe for the given tracepoint. */ | |
2064 | ||
2065 | static struct traceframe * | |
2066 | add_traceframe (struct tracepoint *tpoint) | |
2067 | { | |
2068 | struct traceframe *tframe; | |
2069 | ||
2070 | tframe = trace_buffer_alloc (sizeof (struct traceframe)); | |
2071 | ||
2072 | if (tframe == NULL) | |
2073 | return NULL; | |
2074 | ||
2075 | tframe->tpnum = tpoint->number; | |
2076 | tframe->data_size = 0; | |
2077 | ||
2078 | return tframe; | |
2079 | } | |
2080 | ||
2081 | /* Add a block to the traceframe currently being worked on. */ | |
2082 | ||
2083 | static unsigned char * | |
2084 | add_traceframe_block (struct traceframe *tframe, int amt) | |
2085 | { | |
2086 | unsigned char *block; | |
2087 | ||
2088 | if (!tframe) | |
2089 | return NULL; | |
2090 | ||
2091 | block = trace_buffer_alloc (amt); | |
2092 | ||
2093 | if (!block) | |
2094 | return NULL; | |
2095 | ||
2096 | tframe->data_size += amt; | |
2097 | ||
2098 | return block; | |
2099 | } | |
2100 | ||
2101 | /* Flag that the current traceframe is finished. */ | |
2102 | ||
2103 | static void | |
2104 | finish_traceframe (struct traceframe *tframe) | |
2105 | { | |
2106 | ++traceframe_write_count; | |
2107 | ++traceframes_created; | |
2108 | } | |
2109 | ||
fa593d66 PA |
2110 | #ifndef IN_PROCESS_AGENT |
2111 | ||
219f2f23 PA |
2112 | /* Given a traceframe number NUM, find the NUMth traceframe in the |
2113 | buffer. */ | |
2114 | ||
2115 | static struct traceframe * | |
2116 | find_traceframe (int num) | |
2117 | { | |
2118 | struct traceframe *tframe; | |
2119 | int tfnum = 0; | |
2120 | ||
2121 | for (tframe = FIRST_TRACEFRAME (); | |
2122 | tframe->tpnum != 0; | |
2123 | tframe = NEXT_TRACEFRAME (tframe)) | |
2124 | { | |
2125 | if (tfnum == num) | |
2126 | return tframe; | |
2127 | ++tfnum; | |
2128 | } | |
2129 | ||
2130 | return NULL; | |
2131 | } | |
2132 | ||
2133 | static CORE_ADDR | |
2134 | get_traceframe_address (struct traceframe *tframe) | |
2135 | { | |
2136 | CORE_ADDR addr; | |
2137 | struct tracepoint *tpoint; | |
2138 | ||
2139 | addr = traceframe_get_pc (tframe); | |
2140 | ||
2141 | if (addr) | |
2142 | return addr; | |
2143 | ||
2144 | /* Fallback strategy, will be incorrect for while-stepping frames | |
2145 | and multi-location tracepoints. */ | |
2146 | tpoint = find_next_tracepoint_by_number (NULL, tframe->tpnum); | |
2147 | return tpoint->address; | |
2148 | } | |
2149 | ||
2150 | /* Search for the next traceframe whose address is inside or outside | |
2151 | the given range. */ | |
2152 | ||
2153 | static struct traceframe * | |
2154 | find_next_traceframe_in_range (CORE_ADDR lo, CORE_ADDR hi, int inside_p, | |
2155 | int *tfnump) | |
2156 | { | |
2157 | struct traceframe *tframe; | |
2158 | CORE_ADDR tfaddr; | |
2159 | ||
2160 | *tfnump = current_traceframe + 1; | |
2161 | tframe = find_traceframe (*tfnump); | |
2162 | /* The search is not supposed to wrap around. */ | |
2163 | if (!tframe) | |
2164 | { | |
2165 | *tfnump = -1; | |
2166 | return NULL; | |
2167 | } | |
2168 | ||
2169 | for (; tframe->tpnum != 0; tframe = NEXT_TRACEFRAME (tframe)) | |
2170 | { | |
2171 | tfaddr = get_traceframe_address (tframe); | |
2172 | if (inside_p | |
2173 | ? (lo <= tfaddr && tfaddr <= hi) | |
2174 | : (lo > tfaddr || tfaddr > hi)) | |
2175 | return tframe; | |
2176 | ++*tfnump; | |
2177 | } | |
2178 | ||
2179 | *tfnump = -1; | |
2180 | return NULL; | |
2181 | } | |
2182 | ||
2183 | /* Search for the next traceframe recorded by the given tracepoint. | |
2184 | Note that for multi-location tracepoints, this will find whatever | |
2185 | location appears first. */ | |
2186 | ||
2187 | static struct traceframe * | |
2188 | find_next_traceframe_by_tracepoint (int num, int *tfnump) | |
2189 | { | |
2190 | struct traceframe *tframe; | |
2191 | ||
2192 | *tfnump = current_traceframe + 1; | |
2193 | tframe = find_traceframe (*tfnump); | |
2194 | /* The search is not supposed to wrap around. */ | |
2195 | if (!tframe) | |
2196 | { | |
2197 | *tfnump = -1; | |
2198 | return NULL; | |
2199 | } | |
2200 | ||
2201 | for (; tframe->tpnum != 0; tframe = NEXT_TRACEFRAME (tframe)) | |
2202 | { | |
2203 | if (tframe->tpnum == num) | |
2204 | return tframe; | |
2205 | ++*tfnump; | |
2206 | } | |
2207 | ||
2208 | *tfnump = -1; | |
2209 | return NULL; | |
2210 | } | |
2211 | ||
fa593d66 PA |
2212 | #endif |
2213 | ||
2214 | #ifndef IN_PROCESS_AGENT | |
2215 | ||
219f2f23 PA |
2216 | /* Clear all past trace state. */ |
2217 | ||
2218 | static void | |
2219 | cmd_qtinit (char *packet) | |
2220 | { | |
2221 | struct trace_state_variable *tsv, *prev, *next; | |
2222 | ||
2223 | /* Make sure we don't try to read from a trace frame. */ | |
2224 | current_traceframe = -1; | |
2225 | ||
2226 | trace_debug ("Initializing the trace"); | |
2227 | ||
2228 | clear_installed_tracepoints (); | |
2229 | clear_readonly_regions (); | |
2230 | ||
2231 | tracepoints = NULL; | |
2232 | last_tracepoint = NULL; | |
2233 | ||
2234 | /* Clear out any leftover trace state variables. Ones with target | |
2235 | defined getters should be kept however. */ | |
2236 | prev = NULL; | |
2237 | tsv = trace_state_variables; | |
2238 | while (tsv) | |
2239 | { | |
2240 | trace_debug ("Looking at var %d", tsv->number); | |
2241 | if (tsv->getter == NULL) | |
2242 | { | |
2243 | next = tsv->next; | |
2244 | if (prev) | |
2245 | prev->next = next; | |
2246 | else | |
2247 | trace_state_variables = next; | |
2248 | trace_debug ("Deleting var %d", tsv->number); | |
2249 | free (tsv); | |
2250 | tsv = next; | |
2251 | } | |
2252 | else | |
2253 | { | |
2254 | prev = tsv; | |
2255 | tsv = tsv->next; | |
2256 | } | |
2257 | } | |
2258 | ||
2259 | clear_trace_buffer (); | |
fa593d66 | 2260 | clear_inferior_trace_buffer (); |
219f2f23 PA |
2261 | |
2262 | write_ok (packet); | |
2263 | } | |
2264 | ||
0fb4aa4b PA |
2265 | /* Unprobe the UST marker at ADDRESS. */ |
2266 | ||
2267 | static void | |
2268 | unprobe_marker_at (CORE_ADDR address) | |
2269 | { | |
2270 | char cmd[CMD_BUF_SIZE]; | |
2271 | ||
2272 | sprintf (cmd, "unprobe_marker_at:%s", paddress (address)); | |
2273 | run_inferior_command (cmd); | |
2274 | } | |
2275 | ||
219f2f23 PA |
2276 | /* Restore the program to its pre-tracing state. This routine may be called |
2277 | in error situations, so it needs to be careful about only restoring | |
2278 | from known-valid bits. */ | |
2279 | ||
2280 | static void | |
2281 | clear_installed_tracepoints (void) | |
2282 | { | |
2283 | struct tracepoint *tpoint; | |
2284 | struct tracepoint *prev_stpoint; | |
2285 | ||
7984d532 PA |
2286 | pause_all (1); |
2287 | cancel_breakpoints (); | |
2288 | ||
219f2f23 PA |
2289 | prev_stpoint = NULL; |
2290 | ||
2291 | /* Restore any bytes overwritten by tracepoints. */ | |
2292 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
2293 | { | |
219f2f23 PA |
2294 | /* Catch the case where we might try to remove a tracepoint that |
2295 | was never actually installed. */ | |
2296 | if (tpoint->handle == NULL) | |
2297 | { | |
2298 | trace_debug ("Tracepoint %d at 0x%s was " | |
2299 | "never installed, nothing to clear", | |
2300 | tpoint->number, paddress (tpoint->address)); | |
2301 | continue; | |
2302 | } | |
2303 | ||
fa593d66 PA |
2304 | switch (tpoint->type) |
2305 | { | |
2306 | case trap_tracepoint: | |
2307 | delete_breakpoint (tpoint->handle); | |
2308 | break; | |
2309 | case fast_tracepoint: | |
2310 | delete_fast_tracepoint_jump (tpoint->handle); | |
2311 | break; | |
0fb4aa4b PA |
2312 | case static_tracepoint: |
2313 | if (prev_stpoint != NULL | |
2314 | && prev_stpoint->address == tpoint->address) | |
2315 | /* Nothing to do. We already unprobed a tracepoint set at | |
2316 | this marker address (and there can only be one probe | |
2317 | per marker). */ | |
2318 | ; | |
2319 | else | |
2320 | { | |
2321 | unprobe_marker_at (tpoint->address); | |
2322 | prev_stpoint = tpoint; | |
2323 | } | |
2324 | break; | |
fa593d66 PA |
2325 | } |
2326 | ||
219f2f23 PA |
2327 | tpoint->handle = NULL; |
2328 | } | |
7984d532 PA |
2329 | |
2330 | unpause_all (1); | |
219f2f23 PA |
2331 | } |
2332 | ||
2333 | /* Parse a packet that defines a tracepoint. */ | |
2334 | ||
2335 | static void | |
2336 | cmd_qtdp (char *own_buf) | |
2337 | { | |
2338 | int tppacket; | |
1e4d1764 YQ |
2339 | /* Whether there is a trailing hyphen at the end of the QTDP packet. */ |
2340 | int trail_hyphen = 0; | |
219f2f23 PA |
2341 | ULONGEST num; |
2342 | ULONGEST addr; | |
2343 | ULONGEST count; | |
2344 | struct tracepoint *tpoint; | |
2345 | char *actparm; | |
2346 | char *packet = own_buf; | |
2347 | ||
2348 | packet += strlen ("QTDP:"); | |
2349 | ||
2350 | /* A hyphen at the beginning marks a packet specifying actions for a | |
2351 | tracepoint already supplied. */ | |
2352 | tppacket = 1; | |
2353 | if (*packet == '-') | |
2354 | { | |
2355 | tppacket = 0; | |
2356 | ++packet; | |
2357 | } | |
2358 | packet = unpack_varlen_hex (packet, &num); | |
2359 | ++packet; /* skip a colon */ | |
2360 | packet = unpack_varlen_hex (packet, &addr); | |
2361 | ++packet; /* skip a colon */ | |
2362 | ||
2363 | /* See if we already have this tracepoint. */ | |
2364 | tpoint = find_tracepoint (num, addr); | |
2365 | ||
2366 | if (tppacket) | |
2367 | { | |
2368 | /* Duplicate tracepoints are never allowed. */ | |
2369 | if (tpoint) | |
2370 | { | |
2371 | trace_debug ("Tracepoint error: tracepoint %d" | |
2372 | " at 0x%s already exists", | |
2373 | (int) num, paddress (addr)); | |
2374 | write_enn (own_buf); | |
2375 | return; | |
2376 | } | |
2377 | ||
2378 | tpoint = add_tracepoint (num, addr); | |
2379 | ||
2380 | tpoint->enabled = (*packet == 'E'); | |
2381 | ++packet; /* skip 'E' */ | |
2382 | ++packet; /* skip a colon */ | |
2383 | packet = unpack_varlen_hex (packet, &count); | |
2384 | tpoint->step_count = count; | |
2385 | ++packet; /* skip a colon */ | |
2386 | packet = unpack_varlen_hex (packet, &count); | |
2387 | tpoint->pass_count = count; | |
2388 | /* See if we have any of the additional optional fields. */ | |
2389 | while (*packet == ':') | |
2390 | { | |
2391 | ++packet; | |
fa593d66 PA |
2392 | if (*packet == 'F') |
2393 | { | |
2394 | tpoint->type = fast_tracepoint; | |
2395 | ++packet; | |
2396 | packet = unpack_varlen_hex (packet, &count); | |
2397 | tpoint->orig_size = count; | |
2398 | } | |
0fb4aa4b PA |
2399 | else if (*packet == 'S') |
2400 | { | |
2401 | tpoint->type = static_tracepoint; | |
2402 | ++packet; | |
2403 | } | |
fa593d66 | 2404 | else if (*packet == 'X') |
219f2f23 PA |
2405 | { |
2406 | actparm = (char *) packet; | |
2407 | tpoint->cond = parse_agent_expr (&actparm); | |
2408 | packet = actparm; | |
2409 | } | |
2410 | else if (*packet == '-') | |
2411 | break; | |
2412 | else if (*packet == '\0') | |
2413 | break; | |
2414 | else | |
2415 | trace_debug ("Unknown optional tracepoint field"); | |
2416 | } | |
2417 | if (*packet == '-') | |
1e4d1764 YQ |
2418 | { |
2419 | trail_hyphen = 1; | |
2420 | trace_debug ("Also has actions\n"); | |
2421 | } | |
219f2f23 | 2422 | |
fa593d66 | 2423 | trace_debug ("Defined %stracepoint %d at 0x%s, " |
219f2f23 | 2424 | "enabled %d step %ld pass %ld", |
fa593d66 PA |
2425 | tpoint->type == fast_tracepoint ? "fast " |
2426 | : "", | |
2427 | tpoint->number, paddress (tpoint->address), tpoint->enabled, | |
219f2f23 PA |
2428 | tpoint->step_count, tpoint->pass_count); |
2429 | } | |
2430 | else if (tpoint) | |
2431 | add_tracepoint_action (tpoint, packet); | |
2432 | else | |
2433 | { | |
2434 | trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found", | |
2435 | (int) num, paddress (addr)); | |
2436 | write_enn (own_buf); | |
2437 | return; | |
2438 | } | |
2439 | ||
1e4d1764 YQ |
2440 | /* Install tracepoint during tracing only once for each tracepoint location. |
2441 | For each tracepoint loc, GDB may send multiple QTDP packets, and we can | |
2442 | determine the last QTDP packet for one tracepoint location by checking | |
2443 | trailing hyphen in QTDP packet. */ | |
2444 | if (tracing && !trail_hyphen) | |
2445 | { | |
2446 | /* Pause all threads temporarily while we patch tracepoints. */ | |
2447 | pause_all (0); | |
2448 | ||
2449 | /* download_tracepoint will update global `tracepoints' | |
2450 | list, so it is unsafe to leave threads in jump pad. */ | |
2451 | stabilize_threads (); | |
2452 | ||
2453 | /* Freeze threads. */ | |
2454 | pause_all (1); | |
2455 | ||
2456 | download_tracepoint (tpoint); | |
2457 | install_tracepoint (tpoint, own_buf); | |
2458 | ||
2459 | unpause_all (1); | |
2460 | return; | |
2461 | } | |
2462 | ||
219f2f23 PA |
2463 | write_ok (own_buf); |
2464 | } | |
2465 | ||
2466 | static void | |
2467 | cmd_qtdpsrc (char *own_buf) | |
2468 | { | |
2469 | ULONGEST num, addr, start, slen; | |
2470 | struct tracepoint *tpoint; | |
2471 | char *packet = own_buf; | |
2472 | char *saved, *srctype, *src; | |
2473 | size_t nbytes; | |
2474 | struct source_string *last, *newlast; | |
2475 | ||
2476 | packet += strlen ("QTDPsrc:"); | |
2477 | ||
2478 | packet = unpack_varlen_hex (packet, &num); | |
2479 | ++packet; /* skip a colon */ | |
2480 | packet = unpack_varlen_hex (packet, &addr); | |
2481 | ++packet; /* skip a colon */ | |
2482 | ||
2483 | /* See if we already have this tracepoint. */ | |
2484 | tpoint = find_tracepoint (num, addr); | |
2485 | ||
2486 | if (!tpoint) | |
2487 | { | |
2488 | trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found", | |
2489 | (int) num, paddress (addr)); | |
2490 | write_enn (own_buf); | |
2491 | return; | |
2492 | } | |
2493 | ||
2494 | saved = packet; | |
2495 | packet = strchr (packet, ':'); | |
2496 | srctype = xmalloc (packet - saved + 1); | |
2497 | memcpy (srctype, saved, packet - saved); | |
2498 | srctype[packet - saved] = '\0'; | |
2499 | ++packet; | |
2500 | packet = unpack_varlen_hex (packet, &start); | |
2501 | ++packet; /* skip a colon */ | |
2502 | packet = unpack_varlen_hex (packet, &slen); | |
2503 | ++packet; /* skip a colon */ | |
2504 | src = xmalloc (slen + 1); | |
2505 | nbytes = unhexify (src, packet, strlen (packet) / 2); | |
2506 | src[nbytes] = '\0'; | |
2507 | ||
2508 | newlast = xmalloc (sizeof (struct source_string)); | |
2509 | newlast->type = srctype; | |
2510 | newlast->str = src; | |
2511 | newlast->next = NULL; | |
2512 | /* Always add a source string to the end of the list; | |
2513 | this keeps sequences of actions/commands in the right | |
2514 | order. */ | |
2515 | if (tpoint->source_strings) | |
2516 | { | |
2517 | for (last = tpoint->source_strings; last->next; last = last->next) | |
2518 | ; | |
2519 | last->next = newlast; | |
2520 | } | |
2521 | else | |
2522 | tpoint->source_strings = newlast; | |
2523 | ||
2524 | write_ok (own_buf); | |
2525 | } | |
2526 | ||
2527 | static void | |
2528 | cmd_qtdv (char *own_buf) | |
2529 | { | |
2530 | ULONGEST num, val, builtin; | |
2531 | char *varname; | |
2532 | size_t nbytes; | |
2533 | struct trace_state_variable *tsv; | |
2534 | char *packet = own_buf; | |
2535 | ||
2536 | packet += strlen ("QTDV:"); | |
2537 | ||
2538 | packet = unpack_varlen_hex (packet, &num); | |
2539 | ++packet; /* skip a colon */ | |
2540 | packet = unpack_varlen_hex (packet, &val); | |
2541 | ++packet; /* skip a colon */ | |
2542 | packet = unpack_varlen_hex (packet, &builtin); | |
2543 | ++packet; /* skip a colon */ | |
2544 | ||
2545 | nbytes = strlen (packet) / 2; | |
2546 | varname = xmalloc (nbytes + 1); | |
2547 | nbytes = unhexify (varname, packet, nbytes); | |
2548 | varname[nbytes] = '\0'; | |
2549 | ||
fa593d66 | 2550 | tsv = create_trace_state_variable (num, 1); |
219f2f23 PA |
2551 | tsv->initial_value = (LONGEST) val; |
2552 | tsv->name = varname; | |
2553 | ||
2554 | set_trace_state_variable_value (num, (LONGEST) val); | |
2555 | ||
2556 | write_ok (own_buf); | |
2557 | } | |
2558 | ||
d248b706 KY |
2559 | static void |
2560 | cmd_qtenable_disable (char *own_buf, int enable) | |
2561 | { | |
2562 | char *packet = own_buf; | |
2563 | ULONGEST num, addr; | |
2564 | struct tracepoint *tp; | |
2565 | ||
2566 | packet += strlen (enable ? "QTEnable:" : "QTDisable:"); | |
2567 | packet = unpack_varlen_hex (packet, &num); | |
2568 | ++packet; /* skip a colon */ | |
2569 | packet = unpack_varlen_hex (packet, &addr); | |
2570 | ||
2571 | tp = find_tracepoint (num, addr); | |
2572 | ||
2573 | if (tp) | |
2574 | { | |
2575 | if ((enable && tp->enabled) || (!enable && !tp->enabled)) | |
2576 | { | |
2577 | trace_debug ("Tracepoint %d at 0x%s is already %s", | |
2578 | (int) num, paddress (addr), | |
2579 | enable ? "enabled" : "disabled"); | |
2580 | write_ok (own_buf); | |
2581 | return; | |
2582 | } | |
2583 | ||
2584 | trace_debug ("%s tracepoint %d at 0x%s", | |
2585 | enable ? "Enabling" : "Disabling", | |
2586 | (int) num, paddress (addr)); | |
2587 | ||
2588 | tp->enabled = enable; | |
2589 | ||
2590 | if (tp->type == fast_tracepoint || tp->type == static_tracepoint) | |
2591 | { | |
2592 | int ret; | |
2593 | int offset = offsetof (struct tracepoint, enabled); | |
2594 | CORE_ADDR obj_addr = tp->obj_addr_on_target + offset; | |
2595 | ||
2596 | ret = prepare_to_access_memory (); | |
2597 | if (ret) | |
2598 | { | |
2599 | trace_debug ("Failed to temporarily stop inferior threads"); | |
2600 | write_enn (own_buf); | |
2601 | return; | |
2602 | } | |
2603 | ||
2604 | ret = write_inferior_integer (obj_addr, enable); | |
2605 | done_accessing_memory (); | |
2606 | ||
2607 | if (ret) | |
2608 | { | |
2609 | trace_debug ("Cannot write enabled flag into " | |
2610 | "inferior process memory"); | |
2611 | write_enn (own_buf); | |
2612 | return; | |
2613 | } | |
2614 | } | |
2615 | ||
2616 | write_ok (own_buf); | |
2617 | } | |
2618 | else | |
2619 | { | |
2620 | trace_debug ("Tracepoint %d at 0x%s not found", | |
2621 | (int) num, paddress (addr)); | |
2622 | write_enn (own_buf); | |
2623 | } | |
2624 | } | |
2625 | ||
219f2f23 PA |
2626 | static void |
2627 | cmd_qtv (char *own_buf) | |
2628 | { | |
2629 | ULONGEST num; | |
2630 | LONGEST val; | |
2631 | int err; | |
2632 | char *packet = own_buf; | |
2633 | ||
2634 | packet += strlen ("qTV:"); | |
f8f67713 | 2635 | unpack_varlen_hex (packet, &num); |
219f2f23 PA |
2636 | |
2637 | if (current_traceframe >= 0) | |
2638 | { | |
2639 | err = traceframe_read_tsv ((int) num, &val); | |
2640 | if (err) | |
2641 | { | |
2642 | strcpy (own_buf, "U"); | |
2643 | return; | |
2644 | } | |
2645 | } | |
2646 | /* Only make tsv's be undefined before the first trace run. After a | |
2647 | trace run is over, the user might want to see the last value of | |
2648 | the tsv, and it might not be available in a traceframe. */ | |
2649 | else if (!tracing && strcmp (tracing_stop_reason, "tnotrun") == 0) | |
2650 | { | |
2651 | strcpy (own_buf, "U"); | |
2652 | return; | |
2653 | } | |
2654 | else | |
2655 | val = get_trace_state_variable_value (num); | |
2656 | ||
2657 | sprintf (own_buf, "V%s", phex_nz (val, 0)); | |
2658 | } | |
2659 | ||
2660 | /* Clear out the list of readonly regions. */ | |
2661 | ||
2662 | static void | |
2663 | clear_readonly_regions (void) | |
2664 | { | |
2665 | struct readonly_region *roreg; | |
2666 | ||
2667 | while (readonly_regions) | |
2668 | { | |
2669 | roreg = readonly_regions; | |
2670 | readonly_regions = readonly_regions->next; | |
2671 | free (roreg); | |
2672 | } | |
2673 | } | |
2674 | ||
2675 | /* Parse the collection of address ranges whose contents GDB believes | |
2676 | to be unchanging and so can be read directly from target memory | |
2677 | even while looking at a traceframe. */ | |
2678 | ||
2679 | static void | |
2680 | cmd_qtro (char *own_buf) | |
2681 | { | |
2682 | ULONGEST start, end; | |
2683 | struct readonly_region *roreg; | |
2684 | char *packet = own_buf; | |
2685 | ||
2686 | trace_debug ("Want to mark readonly regions"); | |
2687 | ||
2688 | clear_readonly_regions (); | |
2689 | ||
2690 | packet += strlen ("QTro"); | |
2691 | ||
2692 | while (*packet == ':') | |
2693 | { | |
2694 | ++packet; /* skip a colon */ | |
2695 | packet = unpack_varlen_hex (packet, &start); | |
2696 | ++packet; /* skip a comma */ | |
2697 | packet = unpack_varlen_hex (packet, &end); | |
2698 | roreg = xmalloc (sizeof (struct readonly_region)); | |
2699 | roreg->start = start; | |
2700 | roreg->end = end; | |
2701 | roreg->next = readonly_regions; | |
2702 | readonly_regions = roreg; | |
2703 | trace_debug ("Added readonly region from 0x%s to 0x%s", | |
2704 | paddress (roreg->start), paddress (roreg->end)); | |
2705 | } | |
2706 | ||
2707 | write_ok (own_buf); | |
2708 | } | |
2709 | ||
2710 | /* Test to see if the given range is in our list of readonly ranges. | |
2711 | We only test for being entirely within a range, GDB is not going to | |
2712 | send a single memory packet that spans multiple regions. */ | |
2713 | ||
2714 | int | |
2715 | in_readonly_region (CORE_ADDR addr, ULONGEST length) | |
2716 | { | |
2717 | struct readonly_region *roreg; | |
2718 | ||
2719 | for (roreg = readonly_regions; roreg; roreg = roreg->next) | |
2720 | if (roreg->start <= addr && (addr + length - 1) <= roreg->end) | |
2721 | return 1; | |
2722 | ||
2723 | return 0; | |
2724 | } | |
2725 | ||
fa593d66 PA |
2726 | /* The maximum size of a jump pad entry. */ |
2727 | static const int max_jump_pad_size = 0x100; | |
2728 | ||
2729 | static CORE_ADDR gdb_jump_pad_head; | |
2730 | ||
2731 | /* Return the address of the next free jump space. */ | |
2732 | ||
2733 | static CORE_ADDR | |
2734 | get_jump_space_head (void) | |
2735 | { | |
2736 | if (gdb_jump_pad_head == 0) | |
2737 | { | |
2738 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer, | |
2739 | &gdb_jump_pad_head)) | |
2740 | fatal ("error extracting jump_pad_buffer"); | |
2741 | } | |
2742 | ||
2743 | return gdb_jump_pad_head; | |
2744 | } | |
2745 | ||
2746 | /* Reserve USED bytes from the jump space. */ | |
2747 | ||
2748 | static void | |
2749 | claim_jump_space (ULONGEST used) | |
2750 | { | |
2751 | trace_debug ("claim_jump_space reserves %s bytes at %s", | |
2752 | pulongest (used), paddress (gdb_jump_pad_head)); | |
2753 | gdb_jump_pad_head += used; | |
2754 | } | |
2755 | ||
405f8e94 SS |
2756 | static CORE_ADDR trampoline_buffer_head = 0; |
2757 | static CORE_ADDR trampoline_buffer_tail; | |
2758 | ||
2759 | /* Reserve USED bytes from the trampoline buffer and return the | |
2760 | address of the start of the reserved space in TRAMPOLINE. Returns | |
2761 | non-zero if the space is successfully claimed. */ | |
2762 | ||
2763 | int | |
2764 | claim_trampoline_space (ULONGEST used, CORE_ADDR *trampoline) | |
2765 | { | |
2766 | if (!trampoline_buffer_head) | |
2767 | { | |
2768 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer, | |
2769 | &trampoline_buffer_tail)) | |
2770 | { | |
2771 | fatal ("error extracting trampoline_buffer"); | |
2772 | return 0; | |
2773 | } | |
2774 | ||
2775 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_end, | |
2776 | &trampoline_buffer_head)) | |
2777 | { | |
2778 | fatal ("error extracting trampoline_buffer_end"); | |
2779 | return 0; | |
2780 | } | |
2781 | } | |
2782 | ||
2783 | /* Start claiming space from the top of the trampoline space. If | |
2784 | the space is located at the bottom of the virtual address space, | |
2785 | this reduces the possibility that corruption will occur if a null | |
2786 | pointer is used to write to memory. */ | |
2787 | if (trampoline_buffer_head - trampoline_buffer_tail < used) | |
2788 | { | |
2789 | trace_debug ("claim_trampoline_space failed to reserve %s bytes", | |
2790 | pulongest (used)); | |
2791 | return 0; | |
2792 | } | |
2793 | ||
2794 | trampoline_buffer_head -= used; | |
2795 | ||
2796 | trace_debug ("claim_trampoline_space reserves %s bytes at %s", | |
2797 | pulongest (used), paddress (trampoline_buffer_head)); | |
2798 | ||
2799 | *trampoline = trampoline_buffer_head; | |
2800 | return 1; | |
2801 | } | |
2802 | ||
2803 | /* Returns non-zero if there is space allocated for use in trampolines | |
2804 | for fast tracepoints. */ | |
2805 | ||
2806 | int | |
2807 | have_fast_tracepoint_trampoline_buffer (char *buf) | |
2808 | { | |
2809 | CORE_ADDR trampoline_end, errbuf; | |
2810 | ||
2811 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_end, | |
2812 | &trampoline_end)) | |
2813 | { | |
2814 | fatal ("error extracting trampoline_buffer_end"); | |
2815 | return 0; | |
2816 | } | |
2817 | ||
2818 | if (buf) | |
2819 | { | |
2820 | buf[0] = '\0'; | |
2821 | strcpy (buf, "was claiming"); | |
2822 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_error, | |
2823 | &errbuf)) | |
2824 | { | |
2825 | fatal ("error extracting errbuf"); | |
2826 | return 0; | |
2827 | } | |
2828 | ||
2829 | read_inferior_memory (errbuf, (unsigned char *) buf, 100); | |
2830 | } | |
2831 | ||
2832 | return trampoline_end != 0; | |
2833 | } | |
2834 | ||
0fb4aa4b PA |
2835 | /* Ask the IPA to probe the marker at ADDRESS. Returns -1 if running |
2836 | the command fails, or 0 otherwise. If the command ran | |
2837 | successfully, but probing the marker failed, ERROUT will be filled | |
2838 | with the error to reply to GDB, and -1 is also returned. This | |
2839 | allows directly passing IPA errors to GDB. */ | |
2840 | ||
2841 | static int | |
2842 | probe_marker_at (CORE_ADDR address, char *errout) | |
2843 | { | |
2844 | char cmd[CMD_BUF_SIZE]; | |
2845 | int err; | |
2846 | ||
2847 | sprintf (cmd, "probe_marker_at:%s", paddress (address)); | |
2848 | err = run_inferior_command (cmd); | |
2849 | ||
2850 | if (err == 0) | |
2851 | { | |
2852 | if (*cmd == 'E') | |
2853 | { | |
2854 | strcpy (errout, cmd); | |
2855 | return -1; | |
2856 | } | |
2857 | } | |
2858 | ||
2859 | return err; | |
2860 | } | |
2861 | ||
219f2f23 | 2862 | static void |
5c73ff4e | 2863 | clone_fast_tracepoint (struct tracepoint *to, const struct tracepoint *from) |
219f2f23 | 2864 | { |
5c73ff4e YQ |
2865 | to->jump_pad = from->jump_pad; |
2866 | to->jump_pad_end = from->jump_pad_end; | |
405f8e94 SS |
2867 | to->trampoline = from->trampoline; |
2868 | to->trampoline_end = from->trampoline_end; | |
5c73ff4e YQ |
2869 | to->adjusted_insn_addr = from->adjusted_insn_addr; |
2870 | to->adjusted_insn_addr_end = from->adjusted_insn_addr_end; | |
2871 | to->handle = from->handle; | |
fa593d66 | 2872 | |
5c73ff4e YQ |
2873 | gdb_assert (from->handle); |
2874 | inc_ref_fast_tracepoint_jump ((struct fast_tracepoint_jump *) from->handle); | |
2875 | } | |
2876 | ||
2877 | #define MAX_JUMP_SIZE 20 | |
2878 | ||
2879 | /* Install fast tracepoint. Return 0 if successful, otherwise return | |
2880 | non-zero. */ | |
2881 | ||
2882 | static int | |
405f8e94 | 2883 | install_fast_tracepoint (struct tracepoint *tpoint, char *errbuf) |
5c73ff4e YQ |
2884 | { |
2885 | CORE_ADDR jentry, jump_entry; | |
405f8e94 SS |
2886 | CORE_ADDR trampoline; |
2887 | ULONGEST trampoline_size; | |
5c73ff4e | 2888 | int err = 0; |
fa593d66 PA |
2889 | /* The jump to the jump pad of the last fast tracepoint |
2890 | installed. */ | |
2891 | unsigned char fjump[MAX_JUMP_SIZE]; | |
2892 | ULONGEST fjump_size; | |
219f2f23 | 2893 | |
405f8e94 SS |
2894 | if (tpoint->orig_size < target_get_min_fast_tracepoint_insn_len ()) |
2895 | { | |
2896 | trace_debug ("Requested a fast tracepoint on an instruction " | |
2897 | "that is of less than the minimum length."); | |
2898 | return 0; | |
2899 | } | |
2900 | ||
5c73ff4e YQ |
2901 | jentry = jump_entry = get_jump_space_head (); |
2902 | ||
405f8e94 SS |
2903 | trampoline = 0; |
2904 | trampoline_size = 0; | |
2905 | ||
5c73ff4e YQ |
2906 | /* Install the jump pad. */ |
2907 | err = install_fast_tracepoint_jump_pad (tpoint->obj_addr_on_target, | |
2908 | tpoint->address, | |
2909 | ipa_sym_addrs.addr_gdb_collect, | |
2910 | ipa_sym_addrs.addr_collecting, | |
2911 | tpoint->orig_size, | |
405f8e94 SS |
2912 | &jentry, |
2913 | &trampoline, &trampoline_size, | |
2914 | fjump, &fjump_size, | |
5c73ff4e | 2915 | &tpoint->adjusted_insn_addr, |
405f8e94 SS |
2916 | &tpoint->adjusted_insn_addr_end, |
2917 | errbuf); | |
5c73ff4e YQ |
2918 | |
2919 | if (err) | |
2920 | return 1; | |
2921 | ||
2922 | /* Wire it in. */ | |
2923 | tpoint->handle = set_fast_tracepoint_jump (tpoint->address, fjump, | |
2924 | fjump_size); | |
2925 | ||
2926 | if (tpoint->handle != NULL) | |
2927 | { | |
2928 | tpoint->jump_pad = jump_entry; | |
2929 | tpoint->jump_pad_end = jentry; | |
405f8e94 SS |
2930 | tpoint->trampoline = trampoline; |
2931 | tpoint->trampoline_end = trampoline + trampoline_size; | |
5c73ff4e YQ |
2932 | |
2933 | /* Pad to 8-byte alignment. */ | |
2934 | jentry = ((jentry + 7) & ~0x7); | |
2935 | claim_jump_space (jentry - jump_entry); | |
2936 | } | |
2937 | ||
2938 | return 0; | |
2939 | } | |
2940 | ||
1e4d1764 YQ |
2941 | |
2942 | /* Install tracepoint TPOINT, and write reply message in OWN_BUF. */ | |
2943 | ||
2944 | static void | |
2945 | install_tracepoint (struct tracepoint *tpoint, char *own_buf) | |
2946 | { | |
2947 | tpoint->handle = NULL; | |
2948 | *own_buf = '\0'; | |
2949 | ||
2950 | if (tpoint->type == trap_tracepoint) | |
2951 | { | |
2952 | /* Tracepoints are installed as memory breakpoints. Just go | |
2953 | ahead and install the trap. The breakpoints module | |
2954 | handles duplicated breakpoints, and the memory read | |
2955 | routine handles un-patching traps from memory reads. */ | |
2956 | tpoint->handle = set_breakpoint_at (tpoint->address, | |
2957 | tracepoint_handler); | |
2958 | } | |
2959 | else if (tpoint->type == fast_tracepoint || tpoint->type == static_tracepoint) | |
2960 | { | |
2961 | struct tracepoint *tp; | |
2962 | ||
2963 | if (!in_process_agent_loaded ()) | |
2964 | { | |
2965 | trace_debug ("Requested a %s tracepoint, but fast " | |
2966 | "tracepoints aren't supported.", | |
2967 | tpoint->type == static_tracepoint ? "static" : "fast"); | |
2968 | write_e_ipa_not_loaded (own_buf); | |
2969 | return; | |
2970 | } | |
2971 | if (tpoint->type == static_tracepoint && !in_process_agent_loaded_ust ()) | |
2972 | { | |
2973 | trace_debug ("Requested a static tracepoint, but static " | |
2974 | "tracepoints are not supported."); | |
2975 | write_e_ust_not_loaded (own_buf); | |
2976 | return; | |
2977 | } | |
2978 | ||
2979 | /* Find another fast or static tracepoint at the same address. */ | |
2980 | for (tp = tracepoints; tp; tp = tp->next) | |
2981 | { | |
2982 | if (tp->address == tpoint->address && tp->type == tpoint->type | |
2983 | && tp->number != tpoint->number) | |
2984 | break; | |
2985 | } | |
2986 | ||
2987 | if (tpoint->type == fast_tracepoint) | |
2988 | { | |
2989 | if (tp) /* TPOINT is installed at the same address as TP. */ | |
2990 | clone_fast_tracepoint (tpoint, tp); | |
2991 | else | |
405f8e94 | 2992 | install_fast_tracepoint (tpoint, own_buf); |
1e4d1764 YQ |
2993 | } |
2994 | else | |
2995 | { | |
2996 | if (tp) | |
2997 | tpoint->handle = (void *) -1; | |
2998 | else | |
2999 | { | |
3000 | if (probe_marker_at (tpoint->address, own_buf) == 0) | |
3001 | tpoint->handle = (void *) -1; | |
3002 | } | |
3003 | } | |
3004 | ||
3005 | } | |
3006 | else | |
3007 | internal_error (__FILE__, __LINE__, "Unknown tracepoint type"); | |
3008 | ||
3009 | if (tpoint->handle == NULL) | |
3010 | { | |
3011 | if (*own_buf == '\0') | |
3012 | write_enn (own_buf); | |
3013 | } | |
3014 | else | |
3015 | write_ok (own_buf); | |
3016 | } | |
3017 | ||
5c73ff4e YQ |
3018 | static void |
3019 | cmd_qtstart (char *packet) | |
3020 | { | |
3021 | struct tracepoint *tpoint, *prev_ftpoint, *prev_stpoint; | |
3022 | ||
219f2f23 PA |
3023 | trace_debug ("Starting the trace"); |
3024 | ||
7984d532 | 3025 | /* Pause all threads temporarily while we patch tracepoints. */ |
fa593d66 PA |
3026 | pause_all (0); |
3027 | ||
3028 | /* Get threads out of jump pads. Safe to do here, since this is a | |
3029 | top level command. And, required to do here, since we're | |
3030 | deleting/rewriting jump pads. */ | |
3031 | ||
3032 | stabilize_threads (); | |
3033 | ||
3034 | /* Freeze threads. */ | |
7984d532 PA |
3035 | pause_all (1); |
3036 | ||
fa593d66 PA |
3037 | /* Sync the fast tracepoints list in the inferior ftlib. */ |
3038 | if (in_process_agent_loaded ()) | |
3039 | { | |
3040 | download_tracepoints (); | |
3041 | download_trace_state_variables (); | |
3042 | } | |
3043 | ||
3044 | /* No previous fast tpoint yet. */ | |
3045 | prev_ftpoint = NULL; | |
3046 | ||
0fb4aa4b PA |
3047 | /* No previous static tpoint yet. */ |
3048 | prev_stpoint = NULL; | |
3049 | ||
fa593d66 PA |
3050 | *packet = '\0'; |
3051 | ||
219f2f23 PA |
3052 | /* Install tracepoints. */ |
3053 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
3054 | { | |
3055 | /* Ensure all the hit counts start at zero. */ | |
3056 | tpoint->hit_count = 0; | |
f196051f | 3057 | tpoint->traceframe_usage = 0; |
219f2f23 | 3058 | |
fa593d66 PA |
3059 | if (tpoint->type == trap_tracepoint) |
3060 | { | |
fa593d66 PA |
3061 | /* Tracepoints are installed as memory breakpoints. Just go |
3062 | ahead and install the trap. The breakpoints module | |
3063 | handles duplicated breakpoints, and the memory read | |
3064 | routine handles un-patching traps from memory reads. */ | |
3065 | tpoint->handle = set_breakpoint_at (tpoint->address, | |
3066 | tracepoint_handler); | |
3067 | } | |
3068 | else if (tpoint->type == fast_tracepoint) | |
3069 | { | |
fa593d66 PA |
3070 | if (maybe_write_ipa_not_loaded (packet)) |
3071 | { | |
3072 | trace_debug ("Requested a fast tracepoint, but fast " | |
3073 | "tracepoints aren't supported."); | |
3074 | break; | |
3075 | } | |
3076 | ||
3077 | if (prev_ftpoint != NULL && prev_ftpoint->address == tpoint->address) | |
5c73ff4e | 3078 | clone_fast_tracepoint (tpoint, prev_ftpoint); |
fa593d66 PA |
3079 | else |
3080 | { | |
405f8e94 | 3081 | if (install_fast_tracepoint (tpoint, packet) == 0) |
5c73ff4e | 3082 | prev_ftpoint = tpoint; |
fa593d66 PA |
3083 | } |
3084 | } | |
0fb4aa4b PA |
3085 | else if (tpoint->type == static_tracepoint) |
3086 | { | |
3087 | if (maybe_write_ipa_ust_not_loaded (packet)) | |
3088 | { | |
3089 | trace_debug ("Requested a static tracepoint, but static " | |
3090 | "tracepoints are not supported."); | |
3091 | break; | |
3092 | } | |
3093 | ||
3094 | /* Can only probe a given marker once. */ | |
3095 | if (prev_stpoint != NULL && prev_stpoint->address == tpoint->address) | |
3096 | { | |
3097 | tpoint->handle = (void *) -1; | |
3098 | } | |
3099 | else | |
3100 | { | |
3101 | if (probe_marker_at (tpoint->address, packet) == 0) | |
3102 | { | |
3103 | tpoint->handle = (void *) -1; | |
3104 | ||
3105 | /* So that we can handle multiple static tracepoints | |
3106 | at the same address easily. */ | |
3107 | prev_stpoint = tpoint; | |
3108 | } | |
3109 | } | |
3110 | } | |
fa593d66 PA |
3111 | |
3112 | /* Any failure in the inner loop is sufficient cause to give | |
3113 | up. */ | |
219f2f23 PA |
3114 | if (tpoint->handle == NULL) |
3115 | break; | |
3116 | } | |
3117 | ||
3118 | /* Any error in tracepoint insertion is unacceptable; better to | |
3119 | address the problem now, than end up with a useless or misleading | |
3120 | trace run. */ | |
3121 | if (tpoint != NULL) | |
3122 | { | |
3123 | clear_installed_tracepoints (); | |
3124 | if (*packet == '\0') | |
3125 | write_enn (packet); | |
7984d532 | 3126 | unpause_all (1); |
219f2f23 PA |
3127 | return; |
3128 | } | |
3129 | ||
3130 | stopping_tracepoint = NULL; | |
3131 | trace_buffer_is_full = 0; | |
3132 | expr_eval_result = expr_eval_no_error; | |
3133 | error_tracepoint = NULL; | |
f196051f | 3134 | tracing_start_time = get_timestamp (); |
219f2f23 PA |
3135 | |
3136 | /* Tracing is now active, hits will now start being logged. */ | |
3137 | tracing = 1; | |
3138 | ||
fa593d66 PA |
3139 | if (in_process_agent_loaded ()) |
3140 | { | |
3141 | if (write_inferior_integer (ipa_sym_addrs.addr_tracing, 1)) | |
3142 | fatal ("Error setting tracing variable in lib"); | |
3143 | ||
3144 | if (write_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, | |
3145 | 0)) | |
3146 | fatal ("Error clearing stopping_tracepoint variable in lib"); | |
3147 | ||
3148 | if (write_inferior_integer (ipa_sym_addrs.addr_trace_buffer_is_full, 0)) | |
3149 | fatal ("Error clearing trace_buffer_is_full variable in lib"); | |
3150 | ||
3151 | stop_tracing_bkpt = set_breakpoint_at (ipa_sym_addrs.addr_stop_tracing, | |
3152 | stop_tracing_handler); | |
3153 | if (stop_tracing_bkpt == NULL) | |
3154 | error ("Error setting stop_tracing breakpoint"); | |
3155 | ||
3156 | flush_trace_buffer_bkpt | |
3157 | = set_breakpoint_at (ipa_sym_addrs.addr_flush_trace_buffer, | |
3158 | flush_trace_buffer_handler); | |
3159 | if (flush_trace_buffer_bkpt == NULL) | |
3160 | error ("Error setting flush_trace_buffer breakpoint"); | |
3161 | } | |
3162 | ||
7984d532 PA |
3163 | unpause_all (1); |
3164 | ||
219f2f23 PA |
3165 | write_ok (packet); |
3166 | } | |
3167 | ||
3168 | /* End a tracing run, filling in a stop reason to report back to GDB, | |
3169 | and removing the tracepoints from the code. */ | |
3170 | ||
8336d594 | 3171 | void |
219f2f23 PA |
3172 | stop_tracing (void) |
3173 | { | |
3174 | if (!tracing) | |
3175 | { | |
3176 | trace_debug ("Tracing is already off, ignoring"); | |
3177 | return; | |
3178 | } | |
3179 | ||
3180 | trace_debug ("Stopping the trace"); | |
3181 | ||
fa593d66 PA |
3182 | /* Pause all threads before removing fast jumps from memory, |
3183 | breakpoints, and touching IPA state variables (inferior memory). | |
3184 | Some thread may hit the internal tracing breakpoints, or be | |
3185 | collecting this moment, but that's ok, we don't release the | |
3186 | tpoint object's memory or the jump pads here (we only do that | |
3187 | when we're sure we can move all threads out of the jump pads). | |
3188 | We can't now, since we may be getting here due to the inferior | |
3189 | agent calling us. */ | |
7984d532 PA |
3190 | pause_all (1); |
3191 | /* Since we're removing breakpoints, cancel breakpoint hits, | |
3192 | possibly related to the breakpoints we're about to delete. */ | |
3193 | cancel_breakpoints (); | |
3194 | ||
219f2f23 PA |
3195 | /* Stop logging. Tracepoints can still be hit, but they will not be |
3196 | recorded. */ | |
3197 | tracing = 0; | |
fa593d66 PA |
3198 | if (in_process_agent_loaded ()) |
3199 | { | |
3200 | if (write_inferior_integer (ipa_sym_addrs.addr_tracing, 0)) | |
3201 | fatal ("Error clearing tracing variable in lib"); | |
3202 | } | |
219f2f23 | 3203 | |
f196051f | 3204 | tracing_stop_time = get_timestamp (); |
219f2f23 PA |
3205 | tracing_stop_reason = "t???"; |
3206 | tracing_stop_tpnum = 0; | |
3207 | if (stopping_tracepoint) | |
3208 | { | |
3209 | trace_debug ("Stopping the trace because " | |
3210 | "tracepoint %d was hit %ld times", | |
3211 | stopping_tracepoint->number, | |
3212 | stopping_tracepoint->pass_count); | |
3213 | tracing_stop_reason = "tpasscount"; | |
3214 | tracing_stop_tpnum = stopping_tracepoint->number; | |
3215 | } | |
3216 | else if (trace_buffer_is_full) | |
3217 | { | |
3218 | trace_debug ("Stopping the trace because the trace buffer is full"); | |
3219 | tracing_stop_reason = "tfull"; | |
3220 | } | |
3221 | else if (expr_eval_result != expr_eval_no_error) | |
3222 | { | |
3223 | trace_debug ("Stopping the trace because of an expression eval error"); | |
3224 | tracing_stop_reason = eval_result_names[expr_eval_result]; | |
3225 | tracing_stop_tpnum = error_tracepoint->number; | |
3226 | } | |
fa593d66 | 3227 | #ifndef IN_PROCESS_AGENT |
8336d594 PA |
3228 | else if (!gdb_connected ()) |
3229 | { | |
3230 | trace_debug ("Stopping the trace because GDB disconnected"); | |
3231 | tracing_stop_reason = "tdisconnected"; | |
3232 | } | |
fa593d66 | 3233 | #endif |
219f2f23 PA |
3234 | else |
3235 | { | |
3236 | trace_debug ("Stopping the trace because of a tstop command"); | |
3237 | tracing_stop_reason = "tstop"; | |
3238 | } | |
3239 | ||
3240 | stopping_tracepoint = NULL; | |
3241 | error_tracepoint = NULL; | |
3242 | ||
3243 | /* Clear out the tracepoints. */ | |
3244 | clear_installed_tracepoints (); | |
7984d532 | 3245 | |
fa593d66 PA |
3246 | if (in_process_agent_loaded ()) |
3247 | { | |
3248 | /* Pull in fast tracepoint trace frames from the inferior lib | |
3249 | buffer into our buffer, even if our buffer is already full, | |
3250 | because we want to present the full number of created frames | |
3251 | in addition to what fit in the trace buffer. */ | |
3252 | upload_fast_traceframes (); | |
3253 | } | |
3254 | ||
3255 | if (stop_tracing_bkpt != NULL) | |
3256 | { | |
3257 | delete_breakpoint (stop_tracing_bkpt); | |
3258 | stop_tracing_bkpt = NULL; | |
3259 | } | |
3260 | ||
3261 | if (flush_trace_buffer_bkpt != NULL) | |
3262 | { | |
3263 | delete_breakpoint (flush_trace_buffer_bkpt); | |
3264 | flush_trace_buffer_bkpt = NULL; | |
3265 | } | |
3266 | ||
7984d532 | 3267 | unpause_all (1); |
219f2f23 PA |
3268 | } |
3269 | ||
fa593d66 PA |
3270 | static int |
3271 | stop_tracing_handler (CORE_ADDR addr) | |
3272 | { | |
3273 | trace_debug ("lib hit stop_tracing"); | |
3274 | ||
3275 | /* Don't actually handle it here. When we stop tracing we remove | |
3276 | breakpoints from the inferior, and that is not allowed in a | |
3277 | breakpoint handler (as the caller is walking the breakpoint | |
3278 | list). */ | |
3279 | return 0; | |
3280 | } | |
3281 | ||
3282 | static int | |
3283 | flush_trace_buffer_handler (CORE_ADDR addr) | |
3284 | { | |
3285 | trace_debug ("lib hit flush_trace_buffer"); | |
3286 | return 0; | |
3287 | } | |
3288 | ||
219f2f23 PA |
3289 | static void |
3290 | cmd_qtstop (char *packet) | |
3291 | { | |
3292 | stop_tracing (); | |
3293 | write_ok (packet); | |
3294 | } | |
3295 | ||
8336d594 PA |
3296 | static void |
3297 | cmd_qtdisconnected (char *own_buf) | |
3298 | { | |
3299 | ULONGEST setting; | |
3300 | char *packet = own_buf; | |
3301 | ||
3302 | packet += strlen ("QTDisconnected:"); | |
3303 | ||
3304 | unpack_varlen_hex (packet, &setting); | |
3305 | ||
3306 | write_ok (own_buf); | |
3307 | ||
3308 | disconnected_tracing = setting; | |
3309 | } | |
3310 | ||
219f2f23 PA |
3311 | static void |
3312 | cmd_qtframe (char *own_buf) | |
3313 | { | |
3314 | ULONGEST frame, pc, lo, hi, num; | |
3315 | int tfnum, tpnum; | |
3316 | struct traceframe *tframe; | |
3317 | char *packet = own_buf; | |
3318 | ||
3319 | packet += strlen ("QTFrame:"); | |
3320 | ||
3321 | if (strncmp (packet, "pc:", strlen ("pc:")) == 0) | |
3322 | { | |
3323 | packet += strlen ("pc:"); | |
f8f67713 | 3324 | unpack_varlen_hex (packet, &pc); |
219f2f23 PA |
3325 | trace_debug ("Want to find next traceframe at pc=0x%s", paddress (pc)); |
3326 | tframe = find_next_traceframe_in_range (pc, pc, 1, &tfnum); | |
3327 | } | |
3328 | else if (strncmp (packet, "range:", strlen ("range:")) == 0) | |
3329 | { | |
3330 | packet += strlen ("range:"); | |
3331 | packet = unpack_varlen_hex (packet, &lo); | |
3332 | ++packet; | |
f8f67713 | 3333 | unpack_varlen_hex (packet, &hi); |
219f2f23 PA |
3334 | trace_debug ("Want to find next traceframe in the range 0x%s to 0x%s", |
3335 | paddress (lo), paddress (hi)); | |
3336 | tframe = find_next_traceframe_in_range (lo, hi, 1, &tfnum); | |
3337 | } | |
3338 | else if (strncmp (packet, "outside:", strlen ("outside:")) == 0) | |
3339 | { | |
3340 | packet += strlen ("outside:"); | |
3341 | packet = unpack_varlen_hex (packet, &lo); | |
3342 | ++packet; | |
f8f67713 | 3343 | unpack_varlen_hex (packet, &hi); |
219f2f23 PA |
3344 | trace_debug ("Want to find next traceframe " |
3345 | "outside the range 0x%s to 0x%s", | |
3346 | paddress (lo), paddress (hi)); | |
3347 | tframe = find_next_traceframe_in_range (lo, hi, 0, &tfnum); | |
3348 | } | |
3349 | else if (strncmp (packet, "tdp:", strlen ("tdp:")) == 0) | |
3350 | { | |
3351 | packet += strlen ("tdp:"); | |
f8f67713 | 3352 | unpack_varlen_hex (packet, &num); |
219f2f23 PA |
3353 | tpnum = (int) num; |
3354 | trace_debug ("Want to find next traceframe for tracepoint %d", tpnum); | |
3355 | tframe = find_next_traceframe_by_tracepoint (tpnum, &tfnum); | |
3356 | } | |
3357 | else | |
3358 | { | |
3359 | unpack_varlen_hex (packet, &frame); | |
3360 | tfnum = (int) frame; | |
3361 | if (tfnum == -1) | |
3362 | { | |
3363 | trace_debug ("Want to stop looking at traceframes"); | |
3364 | current_traceframe = -1; | |
3365 | write_ok (own_buf); | |
3366 | return; | |
3367 | } | |
3368 | trace_debug ("Want to look at traceframe %d", tfnum); | |
3369 | tframe = find_traceframe (tfnum); | |
3370 | } | |
3371 | ||
3372 | if (tframe) | |
3373 | { | |
3374 | current_traceframe = tfnum; | |
3375 | sprintf (own_buf, "F%xT%x", tfnum, tframe->tpnum); | |
3376 | } | |
3377 | else | |
3378 | sprintf (own_buf, "F-1"); | |
3379 | } | |
3380 | ||
3381 | static void | |
3382 | cmd_qtstatus (char *packet) | |
3383 | { | |
3384 | char *stop_reason_rsp = NULL; | |
f196051f SS |
3385 | char *buf1, *buf2, *buf3, *str; |
3386 | int slen; | |
3387 | ||
3388 | /* Translate the plain text of the notes back into hex for | |
3389 | transmission. */ | |
3390 | ||
3391 | str = (tracing_user_name ? tracing_user_name : ""); | |
3392 | slen = strlen (str); | |
3393 | buf1 = (char *) alloca (slen * 2 + 1); | |
3394 | hexify (buf1, str, slen); | |
3395 | ||
3396 | str = (tracing_notes ? tracing_notes : ""); | |
3397 | slen = strlen (str); | |
3398 | buf2 = (char *) alloca (slen * 2 + 1); | |
3399 | hexify (buf2, str, slen); | |
3400 | ||
3401 | str = (tracing_stop_note ? tracing_stop_note : ""); | |
3402 | slen = strlen (str); | |
3403 | buf3 = (char *) alloca (slen * 2 + 1); | |
3404 | hexify (buf3, str, slen); | |
219f2f23 PA |
3405 | |
3406 | trace_debug ("Returning trace status as %d, stop reason %s", | |
3407 | tracing, tracing_stop_reason); | |
3408 | ||
fa593d66 PA |
3409 | if (in_process_agent_loaded ()) |
3410 | { | |
3411 | pause_all (1); | |
3412 | ||
3413 | upload_fast_traceframes (); | |
3414 | ||
3415 | unpause_all (1); | |
3416 | } | |
3417 | ||
219f2f23 PA |
3418 | stop_reason_rsp = (char *) tracing_stop_reason; |
3419 | ||
3420 | /* The user visible error string in terror needs to be hex encoded. | |
f196051f | 3421 | We leave it as plain string in `tracing_stop_reason' to ease |
219f2f23 PA |
3422 | debugging. */ |
3423 | if (strncmp (stop_reason_rsp, "terror:", strlen ("terror:")) == 0) | |
3424 | { | |
3425 | const char *result_name; | |
3426 | int hexstr_len; | |
3427 | char *p; | |
3428 | ||
3429 | result_name = stop_reason_rsp + strlen ("terror:"); | |
3430 | hexstr_len = strlen (result_name) * 2; | |
3431 | p = stop_reason_rsp = alloca (strlen ("terror:") + hexstr_len + 1); | |
3432 | strcpy (p, "terror:"); | |
3433 | p += strlen (p); | |
3434 | convert_int_to_ascii ((gdb_byte *) result_name, p, strlen (result_name)); | |
3435 | } | |
3436 | ||
f196051f SS |
3437 | /* If this was a forced stop, include any stop note that was supplied. */ |
3438 | if (strcmp (stop_reason_rsp, "tstop") == 0) | |
3439 | { | |
3440 | stop_reason_rsp = alloca (strlen ("tstop:") + strlen (buf3) + 1); | |
3441 | strcpy (stop_reason_rsp, "tstop:"); | |
3442 | strcat (stop_reason_rsp, buf3); | |
3443 | } | |
3444 | ||
8336d594 PA |
3445 | sprintf (packet, |
3446 | "T%d;" | |
3447 | "%s:%x;" | |
3448 | "tframes:%x;tcreated:%x;" | |
3449 | "tfree:%x;tsize:%s;" | |
3450 | "circular:%d;" | |
f196051f | 3451 | "disconn:%d;" |
242f5f1c | 3452 | "starttime:%s;stoptime:%s;" |
f196051f | 3453 | "username:%s:;notes:%s:", |
623ccd72 | 3454 | tracing ? 1 : 0, |
219f2f23 PA |
3455 | stop_reason_rsp, tracing_stop_tpnum, |
3456 | traceframe_count, traceframes_created, | |
8336d594 PA |
3457 | free_space (), phex_nz (trace_buffer_hi - trace_buffer_lo, 0), |
3458 | circular_trace_buffer, | |
f196051f | 3459 | disconnected_tracing, |
242f5f1c | 3460 | plongest (tracing_start_time), plongest (tracing_stop_time), |
f196051f SS |
3461 | buf1, buf2); |
3462 | } | |
3463 | ||
3464 | static void | |
3465 | cmd_qtp (char *own_buf) | |
3466 | { | |
3467 | ULONGEST num, addr; | |
3468 | struct tracepoint *tpoint; | |
3469 | char *packet = own_buf; | |
3470 | ||
3471 | packet += strlen ("qTP:"); | |
3472 | ||
3473 | packet = unpack_varlen_hex (packet, &num); | |
3474 | ++packet; /* skip a colon */ | |
3475 | packet = unpack_varlen_hex (packet, &addr); | |
3476 | ||
3477 | /* See if we already have this tracepoint. */ | |
3478 | tpoint = find_tracepoint (num, addr); | |
3479 | ||
3480 | if (!tpoint) | |
3481 | { | |
3482 | trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found", | |
3483 | (int) num, paddress (addr)); | |
3484 | write_enn (own_buf); | |
3485 | return; | |
3486 | } | |
3487 | ||
3488 | sprintf (own_buf, "V%lx:%lx", tpoint->hit_count, tpoint->traceframe_usage); | |
219f2f23 PA |
3489 | } |
3490 | ||
3491 | /* State variables to help return all the tracepoint bits. */ | |
3492 | static struct tracepoint *cur_tpoint; | |
3493 | static int cur_action; | |
3494 | static int cur_step_action; | |
3495 | static struct source_string *cur_source_string; | |
3496 | static struct trace_state_variable *cur_tsv; | |
3497 | ||
3498 | /* Compose a response that is an imitation of the syntax by which the | |
3499 | tracepoint was originally downloaded. */ | |
3500 | ||
3501 | static void | |
3502 | response_tracepoint (char *packet, struct tracepoint *tpoint) | |
3503 | { | |
3504 | char *buf; | |
3505 | ||
3506 | sprintf (packet, "T%x:%s:%c:%lx:%lx", tpoint->number, | |
3507 | paddress (tpoint->address), | |
3508 | (tpoint->enabled ? 'E' : 'D'), tpoint->step_count, | |
3509 | tpoint->pass_count); | |
fa593d66 PA |
3510 | if (tpoint->type == fast_tracepoint) |
3511 | sprintf (packet + strlen (packet), ":F%x", tpoint->orig_size); | |
0fb4aa4b PA |
3512 | else if (tpoint->type == static_tracepoint) |
3513 | sprintf (packet + strlen (packet), ":S"); | |
219f2f23 PA |
3514 | |
3515 | if (tpoint->cond) | |
3516 | { | |
3517 | buf = unparse_agent_expr (tpoint->cond); | |
3518 | sprintf (packet + strlen (packet), ":X%x,%s", | |
3519 | tpoint->cond->length, buf); | |
3520 | free (buf); | |
3521 | } | |
3522 | } | |
3523 | ||
3524 | /* Compose a response that is an imitation of the syntax by which the | |
3525 | tracepoint action was originally downloaded (with the difference | |
3526 | that due to the way we store the actions, this will output a packet | |
3527 | per action, while GDB could have combined more than one action | |
3528 | per-packet. */ | |
3529 | ||
3530 | static void | |
3531 | response_action (char *packet, struct tracepoint *tpoint, | |
3532 | char *taction, int step) | |
3533 | { | |
3534 | sprintf (packet, "%c%x:%s:%s", | |
3535 | (step ? 'S' : 'A'), tpoint->number, paddress (tpoint->address), | |
3536 | taction); | |
3537 | } | |
3538 | ||
3539 | /* Compose a response that is an imitation of the syntax by which the | |
3540 | tracepoint source piece was originally downloaded. */ | |
3541 | ||
3542 | static void | |
3543 | response_source (char *packet, | |
3544 | struct tracepoint *tpoint, struct source_string *src) | |
3545 | { | |
3546 | char *buf; | |
3547 | int len; | |
3548 | ||
3549 | len = strlen (src->str); | |
3550 | buf = alloca (len * 2 + 1); | |
3551 | convert_int_to_ascii ((gdb_byte *) src->str, buf, len); | |
3552 | ||
3553 | sprintf (packet, "Z%x:%s:%s:%x:%x:%s", | |
3554 | tpoint->number, paddress (tpoint->address), | |
3555 | src->type, 0, len, buf); | |
3556 | } | |
3557 | ||
3558 | /* Return the first piece of tracepoint definition, and initialize the | |
3559 | state machine that will iterate through all the tracepoint | |
3560 | bits. */ | |
3561 | ||
3562 | static void | |
3563 | cmd_qtfp (char *packet) | |
3564 | { | |
3565 | trace_debug ("Returning first tracepoint definition piece"); | |
3566 | ||
3567 | cur_tpoint = tracepoints; | |
3568 | cur_action = cur_step_action = -1; | |
3569 | cur_source_string = NULL; | |
3570 | ||
3571 | if (cur_tpoint) | |
3572 | response_tracepoint (packet, cur_tpoint); | |
3573 | else | |
3574 | strcpy (packet, "l"); | |
3575 | } | |
3576 | ||
3577 | /* Return additional pieces of tracepoint definition. Each action and | |
3578 | stepping action must go into its own packet, because of packet size | |
3579 | limits, and so we use state variables to deliver one piece at a | |
3580 | time. */ | |
3581 | ||
3582 | static void | |
3583 | cmd_qtsp (char *packet) | |
3584 | { | |
3585 | trace_debug ("Returning subsequent tracepoint definition piece"); | |
3586 | ||
3587 | if (!cur_tpoint) | |
3588 | { | |
3589 | /* This case would normally never occur, but be prepared for | |
3590 | GDB misbehavior. */ | |
3591 | strcpy (packet, "l"); | |
3592 | } | |
3593 | else if (cur_action < cur_tpoint->numactions - 1) | |
3594 | { | |
3595 | ++cur_action; | |
3596 | response_action (packet, cur_tpoint, | |
3597 | cur_tpoint->actions_str[cur_action], 0); | |
3598 | } | |
3599 | else if (cur_step_action < cur_tpoint->num_step_actions - 1) | |
3600 | { | |
3601 | ++cur_step_action; | |
3602 | response_action (packet, cur_tpoint, | |
3603 | cur_tpoint->step_actions_str[cur_step_action], 1); | |
3604 | } | |
3605 | else if ((cur_source_string | |
3606 | ? cur_source_string->next | |
3607 | : cur_tpoint->source_strings)) | |
3608 | { | |
3609 | if (cur_source_string) | |
3610 | cur_source_string = cur_source_string->next; | |
3611 | else | |
3612 | cur_source_string = cur_tpoint->source_strings; | |
3613 | response_source (packet, cur_tpoint, cur_source_string); | |
3614 | } | |
3615 | else | |
3616 | { | |
3617 | cur_tpoint = cur_tpoint->next; | |
3618 | cur_action = cur_step_action = -1; | |
3619 | cur_source_string = NULL; | |
3620 | if (cur_tpoint) | |
3621 | response_tracepoint (packet, cur_tpoint); | |
3622 | else | |
3623 | strcpy (packet, "l"); | |
3624 | } | |
3625 | } | |
3626 | ||
3627 | /* Compose a response that is an imitation of the syntax by which the | |
3628 | trace state variable was originally downloaded. */ | |
3629 | ||
3630 | static void | |
3631 | response_tsv (char *packet, struct trace_state_variable *tsv) | |
3632 | { | |
3633 | char *buf = (char *) ""; | |
3634 | int namelen; | |
3635 | ||
3636 | if (tsv->name) | |
3637 | { | |
3638 | namelen = strlen (tsv->name); | |
3639 | buf = alloca (namelen * 2 + 1); | |
3640 | convert_int_to_ascii ((gdb_byte *) tsv->name, buf, namelen); | |
3641 | } | |
3642 | ||
3643 | sprintf (packet, "%x:%s:%x:%s", tsv->number, phex_nz (tsv->initial_value, 0), | |
3644 | tsv->getter ? 1 : 0, buf); | |
3645 | } | |
3646 | ||
3647 | /* Return the first trace state variable definition, and initialize | |
3648 | the state machine that will iterate through all the tsv bits. */ | |
3649 | ||
3650 | static void | |
3651 | cmd_qtfv (char *packet) | |
3652 | { | |
3653 | trace_debug ("Returning first trace state variable definition"); | |
3654 | ||
3655 | cur_tsv = trace_state_variables; | |
3656 | ||
3657 | if (cur_tsv) | |
3658 | response_tsv (packet, cur_tsv); | |
3659 | else | |
3660 | strcpy (packet, "l"); | |
3661 | } | |
3662 | ||
3663 | /* Return additional trace state variable definitions. */ | |
3664 | ||
3665 | static void | |
3666 | cmd_qtsv (char *packet) | |
3667 | { | |
3668 | trace_debug ("Returning first trace state variable definition"); | |
3669 | ||
3670 | if (!cur_tpoint) | |
3671 | { | |
3672 | /* This case would normally never occur, but be prepared for | |
3673 | GDB misbehavior. */ | |
3674 | strcpy (packet, "l"); | |
3675 | } | |
3676 | else if (cur_tsv) | |
3677 | { | |
3678 | cur_tsv = cur_tsv->next; | |
3679 | if (cur_tsv) | |
3680 | response_tsv (packet, cur_tsv); | |
3681 | else | |
3682 | strcpy (packet, "l"); | |
3683 | } | |
3684 | else | |
3685 | strcpy (packet, "l"); | |
3686 | } | |
3687 | ||
0fb4aa4b PA |
3688 | /* Return the first static tracepoint marker, and initialize the state |
3689 | machine that will iterate through all the static tracepoints | |
3690 | markers. */ | |
3691 | ||
3692 | static void | |
3693 | cmd_qtfstm (char *packet) | |
3694 | { | |
3695 | if (!maybe_write_ipa_ust_not_loaded (packet)) | |
3696 | run_inferior_command (packet); | |
3697 | } | |
3698 | ||
3699 | /* Return additional static tracepoints markers. */ | |
3700 | ||
3701 | static void | |
3702 | cmd_qtsstm (char *packet) | |
3703 | { | |
3704 | if (!maybe_write_ipa_ust_not_loaded (packet)) | |
3705 | run_inferior_command (packet); | |
3706 | } | |
3707 | ||
3708 | /* Return the definition of the static tracepoint at a given address. | |
3709 | Result packet is the same as qTsST's. */ | |
3710 | ||
3711 | static void | |
3712 | cmd_qtstmat (char *packet) | |
3713 | { | |
3714 | if (!maybe_write_ipa_ust_not_loaded (packet)) | |
3715 | run_inferior_command (packet); | |
3716 | } | |
3717 | ||
405f8e94 SS |
3718 | /* Return the minimum instruction size needed for fast tracepoints as a |
3719 | hexadecimal number. */ | |
3720 | ||
3721 | static void | |
3722 | cmd_qtminftpilen (char *packet) | |
3723 | { | |
3724 | sprintf (packet, "%x", target_get_min_fast_tracepoint_insn_len ()); | |
3725 | } | |
3726 | ||
219f2f23 PA |
3727 | /* Respond to qTBuffer packet with a block of raw data from the trace |
3728 | buffer. GDB may ask for a lot, but we are allowed to reply with | |
3729 | only as much as will fit within packet limits or whatever. */ | |
3730 | ||
3731 | static void | |
3732 | cmd_qtbuffer (char *own_buf) | |
3733 | { | |
3734 | ULONGEST offset, num, tot; | |
3735 | unsigned char *tbp; | |
3736 | char *packet = own_buf; | |
3737 | ||
3738 | packet += strlen ("qTBuffer:"); | |
3739 | ||
3740 | packet = unpack_varlen_hex (packet, &offset); | |
3741 | ++packet; /* skip a comma */ | |
f8f67713 | 3742 | unpack_varlen_hex (packet, &num); |
219f2f23 PA |
3743 | |
3744 | trace_debug ("Want to get trace buffer, %d bytes at offset 0x%s", | |
3745 | (int) num, pulongest (offset)); | |
3746 | ||
3747 | tot = (trace_buffer_hi - trace_buffer_lo) - free_space (); | |
3748 | ||
3749 | /* If we're right at the end, reply specially that we're done. */ | |
3750 | if (offset == tot) | |
3751 | { | |
3752 | strcpy (own_buf, "l"); | |
3753 | return; | |
3754 | } | |
3755 | ||
3756 | /* Object to any other out-of-bounds request. */ | |
3757 | if (offset > tot) | |
3758 | { | |
3759 | write_enn (own_buf); | |
3760 | return; | |
3761 | } | |
3762 | ||
3763 | /* Compute the pointer corresponding to the given offset, accounting | |
3764 | for wraparound. */ | |
3765 | tbp = trace_buffer_start + offset; | |
3766 | if (tbp >= trace_buffer_wrap) | |
3767 | tbp -= (trace_buffer_wrap - trace_buffer_lo); | |
3768 | ||
3769 | /* Trim to the remaining bytes if we're close to the end. */ | |
3770 | if (num > tot - offset) | |
3771 | num = tot - offset; | |
3772 | ||
3773 | /* Trim to available packet size. */ | |
3774 | if (num >= (PBUFSIZ - 16) / 2 ) | |
3775 | num = (PBUFSIZ - 16) / 2; | |
3776 | ||
3777 | convert_int_to_ascii (tbp, own_buf, num); | |
3778 | own_buf[num] = '\0'; | |
3779 | } | |
3780 | ||
3781 | static void | |
3782 | cmd_bigqtbuffer (char *own_buf) | |
3783 | { | |
3784 | ULONGEST val; | |
3785 | char *packet = own_buf; | |
3786 | ||
3787 | packet += strlen ("QTBuffer:"); | |
3788 | ||
3789 | if (strncmp ("circular:", packet, strlen ("circular:")) == 0) | |
3790 | { | |
3791 | packet += strlen ("circular:"); | |
f8f67713 | 3792 | unpack_varlen_hex (packet, &val); |
219f2f23 PA |
3793 | circular_trace_buffer = val; |
3794 | trace_debug ("Trace buffer is now %s", | |
3795 | circular_trace_buffer ? "circular" : "linear"); | |
3796 | write_ok (own_buf); | |
3797 | } | |
3798 | else | |
3799 | write_enn (own_buf); | |
3800 | } | |
3801 | ||
f196051f SS |
3802 | static void |
3803 | cmd_qtnotes (char *own_buf) | |
3804 | { | |
3805 | size_t nbytes; | |
3806 | char *saved, *user, *notes, *stopnote; | |
3807 | char *packet = own_buf; | |
3808 | ||
3809 | packet += strlen ("QTNotes:"); | |
3810 | ||
3811 | while (*packet) | |
3812 | { | |
3813 | if (strncmp ("user:", packet, strlen ("user:")) == 0) | |
3814 | { | |
3815 | packet += strlen ("user:"); | |
3816 | saved = packet; | |
3817 | packet = strchr (packet, ';'); | |
3818 | nbytes = (packet - saved) / 2; | |
3819 | user = xmalloc (nbytes + 1); | |
3820 | nbytes = unhexify (user, saved, nbytes); | |
3821 | user[nbytes] = '\0'; | |
3822 | ++packet; /* skip the semicolon */ | |
3823 | trace_debug ("User is '%s'", user); | |
3824 | tracing_user_name = user; | |
3825 | } | |
3826 | else if (strncmp ("notes:", packet, strlen ("notes:")) == 0) | |
3827 | { | |
3828 | packet += strlen ("notes:"); | |
3829 | saved = packet; | |
3830 | packet = strchr (packet, ';'); | |
3831 | nbytes = (packet - saved) / 2; | |
3832 | notes = xmalloc (nbytes + 1); | |
3833 | nbytes = unhexify (notes, saved, nbytes); | |
3834 | notes[nbytes] = '\0'; | |
3835 | ++packet; /* skip the semicolon */ | |
3836 | trace_debug ("Notes is '%s'", notes); | |
3837 | tracing_notes = notes; | |
3838 | } | |
3839 | else if (strncmp ("tstop:", packet, strlen ("tstop:")) == 0) | |
3840 | { | |
3841 | packet += strlen ("tstop:"); | |
3842 | saved = packet; | |
3843 | packet = strchr (packet, ';'); | |
3844 | nbytes = (packet - saved) / 2; | |
3845 | stopnote = xmalloc (nbytes + 1); | |
3846 | nbytes = unhexify (stopnote, saved, nbytes); | |
3847 | stopnote[nbytes] = '\0'; | |
3848 | ++packet; /* skip the semicolon */ | |
3849 | trace_debug ("tstop note is '%s'", stopnote); | |
3850 | tracing_stop_note = stopnote; | |
3851 | } | |
3852 | else | |
3853 | break; | |
3854 | } | |
3855 | ||
3856 | write_ok (own_buf); | |
3857 | } | |
3858 | ||
219f2f23 PA |
3859 | int |
3860 | handle_tracepoint_general_set (char *packet) | |
3861 | { | |
3862 | if (strcmp ("QTinit", packet) == 0) | |
3863 | { | |
3864 | cmd_qtinit (packet); | |
3865 | return 1; | |
3866 | } | |
3867 | else if (strncmp ("QTDP:", packet, strlen ("QTDP:")) == 0) | |
3868 | { | |
3869 | cmd_qtdp (packet); | |
3870 | return 1; | |
3871 | } | |
3872 | else if (strncmp ("QTDPsrc:", packet, strlen ("QTDPsrc:")) == 0) | |
3873 | { | |
3874 | cmd_qtdpsrc (packet); | |
3875 | return 1; | |
3876 | } | |
d248b706 KY |
3877 | else if (strncmp ("QTEnable:", packet, strlen ("QTEnable:")) == 0) |
3878 | { | |
3879 | cmd_qtenable_disable (packet, 1); | |
3880 | return 1; | |
3881 | } | |
3882 | else if (strncmp ("QTDisable:", packet, strlen ("QTDisable:")) == 0) | |
3883 | { | |
3884 | cmd_qtenable_disable (packet, 0); | |
3885 | return 1; | |
3886 | } | |
219f2f23 PA |
3887 | else if (strncmp ("QTDV:", packet, strlen ("QTDV:")) == 0) |
3888 | { | |
3889 | cmd_qtdv (packet); | |
3890 | return 1; | |
3891 | } | |
3892 | else if (strncmp ("QTro:", packet, strlen ("QTro:")) == 0) | |
3893 | { | |
3894 | cmd_qtro (packet); | |
3895 | return 1; | |
3896 | } | |
3897 | else if (strcmp ("QTStart", packet) == 0) | |
3898 | { | |
3899 | cmd_qtstart (packet); | |
3900 | return 1; | |
3901 | } | |
3902 | else if (strcmp ("QTStop", packet) == 0) | |
3903 | { | |
3904 | cmd_qtstop (packet); | |
3905 | return 1; | |
3906 | } | |
8336d594 PA |
3907 | else if (strncmp ("QTDisconnected:", packet, |
3908 | strlen ("QTDisconnected:")) == 0) | |
3909 | { | |
3910 | cmd_qtdisconnected (packet); | |
3911 | return 1; | |
3912 | } | |
219f2f23 PA |
3913 | else if (strncmp ("QTFrame:", packet, strlen ("QTFrame:")) == 0) |
3914 | { | |
3915 | cmd_qtframe (packet); | |
3916 | return 1; | |
3917 | } | |
3918 | else if (strncmp ("QTBuffer:", packet, strlen ("QTBuffer:")) == 0) | |
3919 | { | |
3920 | cmd_bigqtbuffer (packet); | |
3921 | return 1; | |
3922 | } | |
f196051f SS |
3923 | else if (strncmp ("QTNotes:", packet, strlen ("QTNotes:")) == 0) |
3924 | { | |
3925 | cmd_qtnotes (packet); | |
3926 | return 1; | |
3927 | } | |
219f2f23 PA |
3928 | |
3929 | return 0; | |
3930 | } | |
3931 | ||
3932 | int | |
3933 | handle_tracepoint_query (char *packet) | |
3934 | { | |
3935 | if (strcmp ("qTStatus", packet) == 0) | |
3936 | { | |
3937 | cmd_qtstatus (packet); | |
3938 | return 1; | |
3939 | } | |
f196051f SS |
3940 | else if (strncmp ("qTP:", packet, strlen ("qTP:")) == 0) |
3941 | { | |
3942 | cmd_qtp (packet); | |
3943 | return 1; | |
3944 | } | |
219f2f23 PA |
3945 | else if (strcmp ("qTfP", packet) == 0) |
3946 | { | |
3947 | cmd_qtfp (packet); | |
3948 | return 1; | |
3949 | } | |
3950 | else if (strcmp ("qTsP", packet) == 0) | |
3951 | { | |
3952 | cmd_qtsp (packet); | |
3953 | return 1; | |
3954 | } | |
3955 | else if (strcmp ("qTfV", packet) == 0) | |
3956 | { | |
3957 | cmd_qtfv (packet); | |
3958 | return 1; | |
3959 | } | |
3960 | else if (strcmp ("qTsV", packet) == 0) | |
3961 | { | |
3962 | cmd_qtsv (packet); | |
3963 | return 1; | |
3964 | } | |
3965 | else if (strncmp ("qTV:", packet, strlen ("qTV:")) == 0) | |
3966 | { | |
3967 | cmd_qtv (packet); | |
3968 | return 1; | |
3969 | } | |
3970 | else if (strncmp ("qTBuffer:", packet, strlen ("qTBuffer:")) == 0) | |
3971 | { | |
3972 | cmd_qtbuffer (packet); | |
3973 | return 1; | |
3974 | } | |
0fb4aa4b PA |
3975 | else if (strcmp ("qTfSTM", packet) == 0) |
3976 | { | |
3977 | cmd_qtfstm (packet); | |
3978 | return 1; | |
3979 | } | |
3980 | else if (strcmp ("qTsSTM", packet) == 0) | |
3981 | { | |
3982 | cmd_qtsstm (packet); | |
3983 | return 1; | |
3984 | } | |
3985 | else if (strncmp ("qTSTMat:", packet, strlen ("qTSTMat:")) == 0) | |
3986 | { | |
3987 | cmd_qtstmat (packet); | |
3988 | return 1; | |
3989 | } | |
405f8e94 SS |
3990 | else if (strcmp ("qTMinFTPILen", packet) == 0) |
3991 | { | |
3992 | cmd_qtminftpilen (packet); | |
3993 | return 1; | |
3994 | } | |
219f2f23 PA |
3995 | |
3996 | return 0; | |
3997 | } | |
3998 | ||
fa593d66 PA |
3999 | #endif |
4000 | #ifndef IN_PROCESS_AGENT | |
4001 | ||
219f2f23 PA |
4002 | /* Call this when thread TINFO has hit the tracepoint defined by |
4003 | TP_NUMBER and TP_ADDRESS, and that tracepoint has a while-stepping | |
4004 | action. This adds a while-stepping collecting state item to the | |
4005 | threads' collecting state list, so that we can keep track of | |
4006 | multiple simultaneous while-stepping actions being collected by the | |
4007 | same thread. This can happen in cases like: | |
4008 | ||
4009 | ff0001 INSN1 <-- TP1, while-stepping 10 collect $regs | |
4010 | ff0002 INSN2 | |
4011 | ff0003 INSN3 <-- TP2, collect $regs | |
4012 | ff0004 INSN4 <-- TP3, while-stepping 10 collect $regs | |
4013 | ff0005 INSN5 | |
4014 | ||
4015 | Notice that when instruction INSN5 is reached, the while-stepping | |
4016 | actions of both TP1 and TP3 are still being collected, and that TP2 | |
4017 | had been collected meanwhile. The whole range of ff0001-ff0005 | |
4018 | should be single-stepped, due to at least TP1's while-stepping | |
4019 | action covering the whole range. */ | |
4020 | ||
4021 | static void | |
4022 | add_while_stepping_state (struct thread_info *tinfo, | |
4023 | int tp_number, CORE_ADDR tp_address) | |
4024 | { | |
4025 | struct wstep_state *wstep; | |
4026 | ||
4027 | wstep = xmalloc (sizeof (*wstep)); | |
4028 | wstep->next = tinfo->while_stepping; | |
4029 | ||
4030 | wstep->tp_number = tp_number; | |
4031 | wstep->tp_address = tp_address; | |
4032 | wstep->current_step = 0; | |
4033 | ||
4034 | tinfo->while_stepping = wstep; | |
4035 | } | |
4036 | ||
4037 | /* Release the while-stepping collecting state WSTEP. */ | |
4038 | ||
4039 | static void | |
4040 | release_while_stepping_state (struct wstep_state *wstep) | |
4041 | { | |
4042 | free (wstep); | |
4043 | } | |
4044 | ||
4045 | /* Release all while-stepping collecting states currently associated | |
4046 | with thread TINFO. */ | |
4047 | ||
4048 | void | |
4049 | release_while_stepping_state_list (struct thread_info *tinfo) | |
4050 | { | |
4051 | struct wstep_state *head; | |
4052 | ||
4053 | while (tinfo->while_stepping) | |
4054 | { | |
4055 | head = tinfo->while_stepping; | |
4056 | tinfo->while_stepping = head->next; | |
4057 | release_while_stepping_state (head); | |
4058 | } | |
4059 | } | |
4060 | ||
4061 | /* If TINFO was handling a 'while-stepping' action, the step has | |
4062 | finished, so collect any step data needed, and check if any more | |
4063 | steps are required. Return true if the thread was indeed | |
4064 | collecting tracepoint data, false otherwise. */ | |
4065 | ||
4066 | int | |
4067 | tracepoint_finished_step (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
4068 | { | |
4069 | struct tracepoint *tpoint; | |
4070 | struct wstep_state *wstep; | |
4071 | struct wstep_state **wstep_link; | |
4072 | struct trap_tracepoint_ctx ctx; | |
4073 | ||
fa593d66 PA |
4074 | /* Pull in fast tracepoint trace frames from the inferior lib buffer into |
4075 | our buffer. */ | |
4076 | if (in_process_agent_loaded ()) | |
4077 | upload_fast_traceframes (); | |
4078 | ||
219f2f23 PA |
4079 | /* Check if we were indeed collecting data for one of more |
4080 | tracepoints with a 'while-stepping' count. */ | |
4081 | if (tinfo->while_stepping == NULL) | |
4082 | return 0; | |
4083 | ||
4084 | if (!tracing) | |
4085 | { | |
4086 | /* We're not even tracing anymore. Stop this thread from | |
4087 | collecting. */ | |
4088 | release_while_stepping_state_list (tinfo); | |
4089 | ||
4090 | /* The thread had stopped due to a single-step request indeed | |
4091 | explained by a tracepoint. */ | |
4092 | return 1; | |
4093 | } | |
4094 | ||
4095 | wstep = tinfo->while_stepping; | |
4096 | wstep_link = &tinfo->while_stepping; | |
4097 | ||
4098 | trace_debug ("Thread %s finished a single-step for tracepoint %d at 0x%s", | |
4099 | target_pid_to_str (tinfo->entry.id), | |
4100 | wstep->tp_number, paddress (wstep->tp_address)); | |
4101 | ||
fa593d66 | 4102 | ctx.base.type = trap_tracepoint; |
219f2f23 PA |
4103 | ctx.regcache = get_thread_regcache (tinfo, 1); |
4104 | ||
4105 | while (wstep != NULL) | |
4106 | { | |
4107 | tpoint = find_tracepoint (wstep->tp_number, wstep->tp_address); | |
4108 | if (tpoint == NULL) | |
4109 | { | |
4110 | trace_debug ("NO TRACEPOINT %d at 0x%s FOR THREAD %s!", | |
4111 | wstep->tp_number, paddress (wstep->tp_address), | |
4112 | target_pid_to_str (tinfo->entry.id)); | |
4113 | ||
4114 | /* Unlink. */ | |
4115 | *wstep_link = wstep->next; | |
4116 | release_while_stepping_state (wstep); | |
4f269b12 | 4117 | wstep = *wstep_link; |
219f2f23 PA |
4118 | continue; |
4119 | } | |
4120 | ||
4121 | /* We've just finished one step. */ | |
4122 | ++wstep->current_step; | |
4123 | ||
4124 | /* Collect data. */ | |
4125 | collect_data_at_step ((struct tracepoint_hit_ctx *) &ctx, | |
4126 | stop_pc, tpoint, wstep->current_step); | |
4127 | ||
4128 | if (wstep->current_step >= tpoint->step_count) | |
4129 | { | |
4130 | /* The requested numbers of steps have occurred. */ | |
4131 | trace_debug ("Thread %s done stepping for tracepoint %d at 0x%s", | |
4132 | target_pid_to_str (tinfo->entry.id), | |
4133 | wstep->tp_number, paddress (wstep->tp_address)); | |
4134 | ||
4135 | /* Unlink the wstep. */ | |
4136 | *wstep_link = wstep->next; | |
4137 | release_while_stepping_state (wstep); | |
4138 | wstep = *wstep_link; | |
4139 | ||
4140 | /* Only check the hit count now, which ensure that we do all | |
4141 | our stepping before stopping the run. */ | |
4142 | if (tpoint->pass_count > 0 | |
4143 | && tpoint->hit_count >= tpoint->pass_count | |
4144 | && stopping_tracepoint == NULL) | |
4145 | stopping_tracepoint = tpoint; | |
4146 | } | |
4147 | else | |
4148 | { | |
4149 | /* Keep single-stepping until the requested numbers of steps | |
4150 | have occurred. */ | |
4151 | wstep_link = &wstep->next; | |
4152 | wstep = *wstep_link; | |
4153 | } | |
4154 | ||
4155 | if (stopping_tracepoint | |
4156 | || trace_buffer_is_full | |
4157 | || expr_eval_result != expr_eval_no_error) | |
4158 | { | |
4159 | stop_tracing (); | |
4160 | break; | |
4161 | } | |
4162 | } | |
4163 | ||
4164 | return 1; | |
4165 | } | |
4166 | ||
fa593d66 PA |
4167 | /* Handle any internal tracing control breakpoint hits. That means, |
4168 | pull traceframes from the IPA to our buffer, and syncing both | |
4169 | tracing agents when the IPA's tracing stops for some reason. */ | |
4170 | ||
4171 | int | |
4172 | handle_tracepoint_bkpts (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
4173 | { | |
4174 | /* Pull in fast tracepoint trace frames from the inferior in-process | |
4175 | agent's buffer into our buffer. */ | |
4176 | ||
4177 | if (!in_process_agent_loaded ()) | |
4178 | return 0; | |
4179 | ||
4180 | upload_fast_traceframes (); | |
4181 | ||
4182 | /* Check if the in-process agent had decided we should stop | |
4183 | tracing. */ | |
4184 | if (stop_pc == ipa_sym_addrs.addr_stop_tracing) | |
4185 | { | |
4186 | int ipa_trace_buffer_is_full; | |
4187 | CORE_ADDR ipa_stopping_tracepoint; | |
4188 | int ipa_expr_eval_result; | |
4189 | CORE_ADDR ipa_error_tracepoint; | |
4190 | ||
4191 | trace_debug ("lib stopped at stop_tracing"); | |
4192 | ||
4193 | read_inferior_integer (ipa_sym_addrs.addr_trace_buffer_is_full, | |
4194 | &ipa_trace_buffer_is_full); | |
4195 | ||
4196 | read_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, | |
4197 | &ipa_stopping_tracepoint); | |
4198 | write_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, 0); | |
4199 | ||
4200 | read_inferior_data_pointer (ipa_sym_addrs.addr_error_tracepoint, | |
4201 | &ipa_error_tracepoint); | |
4202 | write_inferior_data_pointer (ipa_sym_addrs.addr_error_tracepoint, 0); | |
4203 | ||
4204 | read_inferior_integer (ipa_sym_addrs.addr_expr_eval_result, | |
4205 | &ipa_expr_eval_result); | |
4206 | write_inferior_integer (ipa_sym_addrs.addr_expr_eval_result, 0); | |
4207 | ||
4208 | trace_debug ("lib: trace_buffer_is_full: %d, " | |
4209 | "stopping_tracepoint: %s, " | |
4210 | "ipa_expr_eval_result: %d, " | |
4211 | "error_tracepoint: %s, ", | |
4212 | ipa_trace_buffer_is_full, | |
4213 | paddress (ipa_stopping_tracepoint), | |
4214 | ipa_expr_eval_result, | |
4215 | paddress (ipa_error_tracepoint)); | |
4216 | ||
4217 | if (debug_threads) | |
4218 | { | |
4219 | if (ipa_trace_buffer_is_full) | |
4220 | trace_debug ("lib stopped due to full buffer."); | |
4221 | if (ipa_stopping_tracepoint) | |
4222 | trace_debug ("lib stopped due to tpoint"); | |
4223 | if (ipa_stopping_tracepoint) | |
4224 | trace_debug ("lib stopped due to error"); | |
4225 | } | |
4226 | ||
4227 | if (ipa_stopping_tracepoint != 0) | |
4228 | { | |
4229 | stopping_tracepoint | |
4230 | = fast_tracepoint_from_ipa_tpoint_address (ipa_stopping_tracepoint); | |
4231 | } | |
4232 | else if (ipa_expr_eval_result != expr_eval_no_error) | |
4233 | { | |
4234 | expr_eval_result = ipa_expr_eval_result; | |
4235 | error_tracepoint | |
4236 | = fast_tracepoint_from_ipa_tpoint_address (ipa_error_tracepoint); | |
4237 | } | |
4238 | stop_tracing (); | |
4239 | return 1; | |
4240 | } | |
4241 | else if (stop_pc == ipa_sym_addrs.addr_flush_trace_buffer) | |
4242 | { | |
4243 | trace_debug ("lib stopped at flush_trace_buffer"); | |
4244 | return 1; | |
4245 | } | |
4246 | ||
4247 | return 0; | |
4248 | } | |
4249 | ||
219f2f23 PA |
4250 | /* Return true if TINFO just hit a tracepoint. Collect data if |
4251 | so. */ | |
4252 | ||
4253 | int | |
4254 | tracepoint_was_hit (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
4255 | { | |
4256 | struct tracepoint *tpoint; | |
4257 | int ret = 0; | |
4258 | struct trap_tracepoint_ctx ctx; | |
4259 | ||
4260 | /* Not tracing, don't handle. */ | |
4261 | if (!tracing) | |
4262 | return 0; | |
4263 | ||
fa593d66 | 4264 | ctx.base.type = trap_tracepoint; |
219f2f23 PA |
4265 | ctx.regcache = get_thread_regcache (tinfo, 1); |
4266 | ||
4267 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
4268 | { | |
fa593d66 PA |
4269 | /* Note that we collect fast tracepoints here as well. We'll |
4270 | step over the fast tracepoint jump later, which avoids the | |
4271 | double collect. */ | |
219f2f23 PA |
4272 | if (tpoint->enabled && stop_pc == tpoint->address) |
4273 | { | |
4274 | trace_debug ("Thread %s at address of tracepoint %d at 0x%s", | |
4275 | target_pid_to_str (tinfo->entry.id), | |
4276 | tpoint->number, paddress (tpoint->address)); | |
4277 | ||
4278 | /* Test the condition if present, and collect if true. */ | |
4279 | if (!tpoint->cond | |
4280 | || (condition_true_at_tracepoint | |
4281 | ((struct tracepoint_hit_ctx *) &ctx, tpoint))) | |
4282 | collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
4283 | stop_pc, tpoint); | |
4284 | ||
4285 | if (stopping_tracepoint | |
4286 | || trace_buffer_is_full | |
4287 | || expr_eval_result != expr_eval_no_error) | |
4288 | { | |
4289 | stop_tracing (); | |
4290 | } | |
4291 | /* If the tracepoint had a 'while-stepping' action, then set | |
4292 | the thread to collect this tracepoint on the following | |
4293 | single-steps. */ | |
4294 | else if (tpoint->step_count > 0) | |
4295 | { | |
4296 | add_while_stepping_state (tinfo, | |
4297 | tpoint->number, tpoint->address); | |
4298 | } | |
4299 | ||
4300 | ret = 1; | |
4301 | } | |
4302 | } | |
4303 | ||
4304 | return ret; | |
4305 | } | |
4306 | ||
fa593d66 PA |
4307 | #endif |
4308 | ||
0fb4aa4b PA |
4309 | #if defined IN_PROCESS_AGENT && defined HAVE_UST |
4310 | struct ust_marker_data; | |
4311 | static void collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
4312 | CORE_ADDR stop_pc, | |
4313 | struct tracepoint *tpoint, | |
4314 | struct traceframe *tframe); | |
4315 | #endif | |
4316 | ||
219f2f23 PA |
4317 | /* Create a trace frame for the hit of the given tracepoint in the |
4318 | given thread. */ | |
4319 | ||
4320 | static void | |
4321 | collect_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, CORE_ADDR stop_pc, | |
4322 | struct tracepoint *tpoint) | |
4323 | { | |
4324 | struct traceframe *tframe; | |
4325 | int acti; | |
4326 | ||
4327 | /* Only count it as a hit when we actually collect data. */ | |
4328 | tpoint->hit_count++; | |
4329 | ||
4330 | /* If we've exceeded a defined pass count, record the event for | |
4331 | later, and finish the collection for this hit. This test is only | |
4332 | for nonstepping tracepoints, stepping tracepoints test at the end | |
4333 | of their while-stepping loop. */ | |
4334 | if (tpoint->pass_count > 0 | |
4335 | && tpoint->hit_count >= tpoint->pass_count | |
4336 | && tpoint->step_count == 0 | |
4337 | && stopping_tracepoint == NULL) | |
4338 | stopping_tracepoint = tpoint; | |
4339 | ||
4340 | trace_debug ("Making new traceframe for tracepoint %d at 0x%s, hit %ld", | |
4341 | tpoint->number, paddress (tpoint->address), tpoint->hit_count); | |
4342 | ||
4343 | tframe = add_traceframe (tpoint); | |
4344 | ||
4345 | if (tframe) | |
4346 | { | |
4347 | for (acti = 0; acti < tpoint->numactions; ++acti) | |
4348 | { | |
fa593d66 | 4349 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
4350 | trace_debug ("Tracepoint %d at 0x%s about to do action '%s'", |
4351 | tpoint->number, paddress (tpoint->address), | |
4352 | tpoint->actions_str[acti]); | |
fa593d66 | 4353 | #endif |
219f2f23 PA |
4354 | |
4355 | do_action_at_tracepoint (ctx, stop_pc, tpoint, tframe, | |
4356 | tpoint->actions[acti]); | |
4357 | } | |
4358 | ||
4359 | finish_traceframe (tframe); | |
4360 | } | |
4361 | ||
4362 | if (tframe == NULL && tracing) | |
4363 | trace_buffer_is_full = 1; | |
4364 | } | |
4365 | ||
fa593d66 PA |
4366 | #ifndef IN_PROCESS_AGENT |
4367 | ||
219f2f23 PA |
4368 | static void |
4369 | collect_data_at_step (struct tracepoint_hit_ctx *ctx, | |
4370 | CORE_ADDR stop_pc, | |
4371 | struct tracepoint *tpoint, int current_step) | |
4372 | { | |
4373 | struct traceframe *tframe; | |
4374 | int acti; | |
4375 | ||
4376 | trace_debug ("Making new step traceframe for " | |
4377 | "tracepoint %d at 0x%s, step %d of %ld, hit %ld", | |
4378 | tpoint->number, paddress (tpoint->address), | |
4379 | current_step, tpoint->step_count, | |
4380 | tpoint->hit_count); | |
4381 | ||
4382 | tframe = add_traceframe (tpoint); | |
4383 | ||
4384 | if (tframe) | |
4385 | { | |
4386 | for (acti = 0; acti < tpoint->num_step_actions; ++acti) | |
4387 | { | |
4388 | trace_debug ("Tracepoint %d at 0x%s about to do step action '%s'", | |
4389 | tpoint->number, paddress (tpoint->address), | |
4390 | tpoint->step_actions_str[acti]); | |
4391 | ||
4392 | do_action_at_tracepoint (ctx, stop_pc, tpoint, tframe, | |
4393 | tpoint->step_actions[acti]); | |
4394 | } | |
4395 | ||
4396 | finish_traceframe (tframe); | |
4397 | } | |
4398 | ||
4399 | if (tframe == NULL && tracing) | |
4400 | trace_buffer_is_full = 1; | |
4401 | } | |
4402 | ||
fa593d66 PA |
4403 | #endif |
4404 | ||
219f2f23 PA |
4405 | static struct regcache * |
4406 | get_context_regcache (struct tracepoint_hit_ctx *ctx) | |
4407 | { | |
fa593d66 PA |
4408 | struct regcache *regcache = NULL; |
4409 | ||
4410 | #ifdef IN_PROCESS_AGENT | |
4411 | if (ctx->type == fast_tracepoint) | |
4412 | { | |
4413 | struct fast_tracepoint_ctx *fctx = (struct fast_tracepoint_ctx *) ctx; | |
4414 | if (!fctx->regcache_initted) | |
4415 | { | |
4416 | fctx->regcache_initted = 1; | |
4417 | init_register_cache (&fctx->regcache, fctx->regspace); | |
4418 | supply_regblock (&fctx->regcache, NULL); | |
4419 | supply_fast_tracepoint_registers (&fctx->regcache, fctx->regs); | |
4420 | } | |
4421 | regcache = &fctx->regcache; | |
4422 | } | |
0fb4aa4b PA |
4423 | #ifdef HAVE_UST |
4424 | if (ctx->type == static_tracepoint) | |
4425 | { | |
493e2a69 MS |
4426 | struct static_tracepoint_ctx *sctx |
4427 | = (struct static_tracepoint_ctx *) ctx; | |
4428 | ||
0fb4aa4b PA |
4429 | if (!sctx->regcache_initted) |
4430 | { | |
4431 | sctx->regcache_initted = 1; | |
4432 | init_register_cache (&sctx->regcache, sctx->regspace); | |
4433 | supply_regblock (&sctx->regcache, NULL); | |
4434 | /* Pass down the tracepoint address, because REGS doesn't | |
4435 | include the PC, but we know what it must have been. */ | |
4436 | supply_static_tracepoint_registers (&sctx->regcache, | |
4437 | (const unsigned char *) | |
4438 | sctx->regs, | |
4439 | sctx->tpoint->address); | |
4440 | } | |
4441 | regcache = &sctx->regcache; | |
4442 | } | |
4443 | #endif | |
fa593d66 PA |
4444 | #else |
4445 | if (ctx->type == trap_tracepoint) | |
4446 | { | |
4447 | struct trap_tracepoint_ctx *tctx = (struct trap_tracepoint_ctx *) ctx; | |
4448 | regcache = tctx->regcache; | |
4449 | } | |
4450 | #endif | |
219f2f23 PA |
4451 | |
4452 | gdb_assert (regcache != NULL); | |
4453 | ||
4454 | return regcache; | |
4455 | } | |
4456 | ||
4457 | static void | |
4458 | do_action_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
4459 | CORE_ADDR stop_pc, | |
4460 | struct tracepoint *tpoint, | |
4461 | struct traceframe *tframe, | |
4462 | struct tracepoint_action *taction) | |
4463 | { | |
4464 | enum eval_result_type err; | |
4465 | ||
4466 | switch (taction->type) | |
4467 | { | |
4468 | case 'M': | |
4469 | { | |
4470 | struct collect_memory_action *maction; | |
4471 | ||
4472 | maction = (struct collect_memory_action *) taction; | |
4473 | ||
4474 | trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)", | |
4475 | pulongest (maction->len), | |
4476 | paddress (maction->addr), maction->basereg); | |
4477 | /* (should use basereg) */ | |
4478 | agent_mem_read (tframe, NULL, | |
4479 | (CORE_ADDR) maction->addr, maction->len); | |
4480 | break; | |
4481 | } | |
4482 | case 'R': | |
4483 | { | |
219f2f23 PA |
4484 | unsigned char *regspace; |
4485 | struct regcache tregcache; | |
4486 | struct regcache *context_regcache; | |
4487 | ||
219f2f23 PA |
4488 | |
4489 | trace_debug ("Want to collect registers"); | |
4490 | ||
4491 | /* Collect all registers for now. */ | |
4492 | regspace = add_traceframe_block (tframe, | |
4493 | 1 + register_cache_size ()); | |
4494 | if (regspace == NULL) | |
4495 | { | |
4496 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
4497 | break; | |
4498 | } | |
4499 | /* Identify a register block. */ | |
4500 | *regspace = 'R'; | |
4501 | ||
4502 | context_regcache = get_context_regcache (ctx); | |
4503 | ||
4504 | /* Wrap the regblock in a register cache (in the stack, we | |
4505 | don't want to malloc here). */ | |
4506 | init_register_cache (&tregcache, regspace + 1); | |
4507 | ||
4508 | /* Copy the register data to the regblock. */ | |
4509 | regcache_cpy (&tregcache, context_regcache); | |
4510 | ||
fa593d66 | 4511 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
4512 | /* On some platforms, trap-based tracepoints will have the PC |
4513 | pointing to the next instruction after the trap, but we | |
4514 | don't want the user or GDB trying to guess whether the | |
4515 | saved PC needs adjusting; so always record the adjusted | |
4516 | stop_pc. Note that we can't use tpoint->address instead, | |
fa593d66 PA |
4517 | since it will be wrong for while-stepping actions. This |
4518 | adjustment is a nop for fast tracepoints collected from the | |
4519 | in-process lib (but not if GDBserver is collecting one | |
4520 | preemptively), since the PC had already been adjusted to | |
4521 | contain the tracepoint's address by the jump pad. */ | |
219f2f23 PA |
4522 | trace_debug ("Storing stop pc (0x%s) in regblock", |
4523 | paddress (tpoint->address)); | |
4524 | ||
4525 | /* This changes the regblock, not the thread's | |
4526 | regcache. */ | |
4527 | regcache_write_pc (&tregcache, stop_pc); | |
fa593d66 | 4528 | #endif |
219f2f23 PA |
4529 | } |
4530 | break; | |
4531 | case 'X': | |
4532 | { | |
4533 | struct eval_expr_action *eaction; | |
4534 | ||
4535 | eaction = (struct eval_expr_action *) taction; | |
4536 | ||
4537 | trace_debug ("Want to evaluate expression"); | |
4538 | ||
4539 | err = eval_agent_expr (ctx, tframe, eaction->expr, NULL); | |
4540 | ||
4541 | if (err != expr_eval_no_error) | |
4542 | { | |
4543 | record_tracepoint_error (tpoint, "action expression", err); | |
4544 | return; | |
4545 | } | |
4546 | } | |
4547 | break; | |
0fb4aa4b PA |
4548 | case 'L': |
4549 | { | |
4550 | #if defined IN_PROCESS_AGENT && defined HAVE_UST | |
4551 | trace_debug ("Want to collect static trace data"); | |
4552 | collect_ust_data_at_tracepoint (ctx, stop_pc, | |
4553 | tpoint, tframe); | |
4554 | #else | |
4555 | trace_debug ("warning: collecting static trace data, " | |
4556 | "but static tracepoints are not supported"); | |
4557 | #endif | |
4558 | } | |
4559 | break; | |
219f2f23 PA |
4560 | default: |
4561 | trace_debug ("unknown trace action '%c', ignoring", taction->type); | |
4562 | break; | |
4563 | } | |
4564 | } | |
4565 | ||
4566 | static int | |
4567 | condition_true_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
4568 | struct tracepoint *tpoint) | |
4569 | { | |
4570 | ULONGEST value = 0; | |
4571 | enum eval_result_type err; | |
4572 | ||
c6beb2cb PA |
4573 | /* Presently, gdbserver doesn't run compiled conditions, only the |
4574 | IPA does. If the program stops at a fast tracepoint's address | |
4575 | (e.g., due to a breakpoint, trap tracepoint, or stepping), | |
4576 | gdbserver preemptively collect the fast tracepoint. Later, on | |
4577 | resume, gdbserver steps over the fast tracepoint like it steps | |
4578 | over breakpoints, so that the IPA doesn't see that fast | |
4579 | tracepoint. This avoids double collects of fast tracepoints in | |
4580 | that stopping scenario. Having gdbserver itself handle the fast | |
4581 | tracepoint gives the user a consistent view of when fast or trap | |
4582 | tracepoints are collected, compared to an alternative where only | |
4583 | trap tracepoints are collected on stop, and fast tracepoints on | |
4584 | resume. When a fast tracepoint is being processed by gdbserver, | |
4585 | it is always the non-compiled condition expression that is | |
4586 | used. */ | |
4587 | #ifdef IN_PROCESS_AGENT | |
6a271cae PA |
4588 | if (tpoint->compiled_cond) |
4589 | err = ((condfn) (uintptr_t) (tpoint->compiled_cond)) (ctx, &value); | |
4590 | else | |
c6beb2cb | 4591 | #endif |
6a271cae | 4592 | err = eval_agent_expr (ctx, NULL, tpoint->cond, &value); |
219f2f23 PA |
4593 | |
4594 | if (err != expr_eval_no_error) | |
4595 | { | |
4596 | record_tracepoint_error (tpoint, "condition", err); | |
4597 | /* The error case must return false. */ | |
4598 | return 0; | |
4599 | } | |
4600 | ||
4601 | trace_debug ("Tracepoint %d at 0x%s condition evals to %s", | |
4602 | tpoint->number, paddress (tpoint->address), | |
4603 | pulongest (value)); | |
4604 | return (value ? 1 : 0); | |
4605 | } | |
4606 | ||
fa593d66 PA |
4607 | #ifndef IN_PROCESS_AGENT |
4608 | ||
219f2f23 PA |
4609 | /* The packet form of an agent expression consists of an 'X', number |
4610 | of bytes in expression, a comma, and then the bytes. */ | |
4611 | ||
4612 | static struct agent_expr * | |
4613 | parse_agent_expr (char **actparm) | |
4614 | { | |
4615 | char *act = *actparm; | |
4616 | ULONGEST xlen; | |
4617 | struct agent_expr *aexpr; | |
4618 | ||
4619 | ++act; /* skip the X */ | |
4620 | act = unpack_varlen_hex (act, &xlen); | |
4621 | ++act; /* skip a comma */ | |
4622 | aexpr = xmalloc (sizeof (struct agent_expr)); | |
4623 | aexpr->length = xlen; | |
4624 | aexpr->bytes = xmalloc (xlen); | |
4625 | convert_ascii_to_int (act, aexpr->bytes, xlen); | |
4626 | *actparm = act + (xlen * 2); | |
4627 | return aexpr; | |
4628 | } | |
4629 | ||
4630 | /* Convert the bytes of an agent expression back into hex digits, so | |
4631 | they can be printed or uploaded. This allocates the buffer, | |
4632 | callers should free when they are done with it. */ | |
4633 | ||
4634 | static char * | |
4635 | unparse_agent_expr (struct agent_expr *aexpr) | |
4636 | { | |
4637 | char *rslt; | |
4638 | ||
4639 | rslt = xmalloc (2 * aexpr->length + 1); | |
4640 | convert_int_to_ascii (aexpr->bytes, rslt, aexpr->length); | |
4641 | return rslt; | |
4642 | } | |
4643 | ||
fa593d66 PA |
4644 | #endif |
4645 | ||
94d5e490 TT |
4646 | /* A wrapper for gdb_agent_op_names that does some bounds-checking. */ |
4647 | ||
4648 | static const char * | |
4649 | gdb_agent_op_name (int op) | |
4650 | { | |
4651 | if (op < 0 || op >= gdb_agent_op_last || gdb_agent_op_names[op] == NULL) | |
4652 | return "?undef?"; | |
4653 | return gdb_agent_op_names[op]; | |
4654 | } | |
4655 | ||
219f2f23 PA |
4656 | /* The agent expression evaluator, as specified by the GDB docs. It |
4657 | returns 0 if everything went OK, and a nonzero error code | |
4658 | otherwise. */ | |
4659 | ||
4660 | static enum eval_result_type | |
4661 | eval_agent_expr (struct tracepoint_hit_ctx *ctx, | |
4662 | struct traceframe *tframe, | |
4663 | struct agent_expr *aexpr, | |
4664 | ULONGEST *rslt) | |
4665 | { | |
4666 | int pc = 0; | |
4667 | #define STACK_MAX 100 | |
4668 | ULONGEST stack[STACK_MAX], top; | |
4669 | int sp = 0; | |
4670 | unsigned char op; | |
4671 | int arg; | |
4672 | ||
4673 | /* This union is a convenient way to convert representations. For | |
4674 | now, assume a standard architecture where the hardware integer | |
4675 | types have 8, 16, 32, 64 bit types. A more robust solution would | |
4676 | be to import stdint.h from gnulib. */ | |
4677 | union | |
4678 | { | |
4679 | union | |
4680 | { | |
4681 | unsigned char bytes[1]; | |
4682 | unsigned char val; | |
4683 | } u8; | |
4684 | union | |
4685 | { | |
4686 | unsigned char bytes[2]; | |
4687 | unsigned short val; | |
4688 | } u16; | |
4689 | union | |
4690 | { | |
4691 | unsigned char bytes[4]; | |
4692 | unsigned int val; | |
4693 | } u32; | |
4694 | union | |
4695 | { | |
4696 | unsigned char bytes[8]; | |
4697 | ULONGEST val; | |
4698 | } u64; | |
4699 | } cnv; | |
4700 | ||
4701 | if (aexpr->length == 0) | |
4702 | { | |
4703 | trace_debug ("empty agent expression"); | |
4704 | return expr_eval_empty_expression; | |
4705 | } | |
4706 | ||
4707 | /* Cache the stack top in its own variable. Much of the time we can | |
4708 | operate on this variable, rather than dinking with the stack. It | |
4709 | needs to be copied to the stack when sp changes. */ | |
4710 | top = 0; | |
4711 | ||
4712 | while (1) | |
4713 | { | |
4714 | op = aexpr->bytes[pc++]; | |
4715 | ||
4716 | trace_debug ("About to interpret byte 0x%x", op); | |
4717 | ||
4718 | switch (op) | |
4719 | { | |
4720 | case gdb_agent_op_add: | |
4721 | top += stack[--sp]; | |
4722 | break; | |
4723 | ||
4724 | case gdb_agent_op_sub: | |
4725 | top = stack[--sp] - top; | |
4726 | break; | |
4727 | ||
4728 | case gdb_agent_op_mul: | |
4729 | top *= stack[--sp]; | |
4730 | break; | |
4731 | ||
4732 | case gdb_agent_op_div_signed: | |
4733 | if (top == 0) | |
4734 | { | |
4735 | trace_debug ("Attempted to divide by zero"); | |
4736 | return expr_eval_divide_by_zero; | |
4737 | } | |
4738 | top = ((LONGEST) stack[--sp]) / ((LONGEST) top); | |
4739 | break; | |
4740 | ||
4741 | case gdb_agent_op_div_unsigned: | |
4742 | if (top == 0) | |
4743 | { | |
4744 | trace_debug ("Attempted to divide by zero"); | |
4745 | return expr_eval_divide_by_zero; | |
4746 | } | |
4747 | top = stack[--sp] / top; | |
4748 | break; | |
4749 | ||
4750 | case gdb_agent_op_rem_signed: | |
4751 | if (top == 0) | |
4752 | { | |
4753 | trace_debug ("Attempted to divide by zero"); | |
4754 | return expr_eval_divide_by_zero; | |
4755 | } | |
4756 | top = ((LONGEST) stack[--sp]) % ((LONGEST) top); | |
4757 | break; | |
4758 | ||
4759 | case gdb_agent_op_rem_unsigned: | |
4760 | if (top == 0) | |
4761 | { | |
4762 | trace_debug ("Attempted to divide by zero"); | |
4763 | return expr_eval_divide_by_zero; | |
4764 | } | |
4765 | top = stack[--sp] % top; | |
4766 | break; | |
4767 | ||
4768 | case gdb_agent_op_lsh: | |
4769 | top = stack[--sp] << top; | |
4770 | break; | |
4771 | ||
4772 | case gdb_agent_op_rsh_signed: | |
4773 | top = ((LONGEST) stack[--sp]) >> top; | |
4774 | break; | |
4775 | ||
4776 | case gdb_agent_op_rsh_unsigned: | |
4777 | top = stack[--sp] >> top; | |
4778 | break; | |
4779 | ||
4780 | case gdb_agent_op_trace: | |
4781 | agent_mem_read (tframe, | |
4782 | NULL, (CORE_ADDR) stack[--sp], (ULONGEST) top); | |
4783 | if (--sp >= 0) | |
4784 | top = stack[sp]; | |
4785 | break; | |
4786 | ||
4787 | case gdb_agent_op_trace_quick: | |
4788 | arg = aexpr->bytes[pc++]; | |
4789 | agent_mem_read (tframe, NULL, (CORE_ADDR) top, (ULONGEST) arg); | |
4790 | break; | |
4791 | ||
4792 | case gdb_agent_op_log_not: | |
4793 | top = !top; | |
4794 | break; | |
4795 | ||
4796 | case gdb_agent_op_bit_and: | |
4797 | top &= stack[--sp]; | |
4798 | break; | |
4799 | ||
4800 | case gdb_agent_op_bit_or: | |
4801 | top |= stack[--sp]; | |
4802 | break; | |
4803 | ||
4804 | case gdb_agent_op_bit_xor: | |
4805 | top ^= stack[--sp]; | |
4806 | break; | |
4807 | ||
4808 | case gdb_agent_op_bit_not: | |
4809 | top = ~top; | |
4810 | break; | |
4811 | ||
4812 | case gdb_agent_op_equal: | |
4813 | top = (stack[--sp] == top); | |
4814 | break; | |
4815 | ||
4816 | case gdb_agent_op_less_signed: | |
4817 | top = (((LONGEST) stack[--sp]) < ((LONGEST) top)); | |
4818 | break; | |
4819 | ||
4820 | case gdb_agent_op_less_unsigned: | |
4821 | top = (stack[--sp] < top); | |
4822 | break; | |
4823 | ||
4824 | case gdb_agent_op_ext: | |
4825 | arg = aexpr->bytes[pc++]; | |
4826 | if (arg < (sizeof (LONGEST) * 8)) | |
4827 | { | |
4828 | LONGEST mask = 1 << (arg - 1); | |
4829 | top &= ((LONGEST) 1 << arg) - 1; | |
4830 | top = (top ^ mask) - mask; | |
4831 | } | |
4832 | break; | |
4833 | ||
4834 | case gdb_agent_op_ref8: | |
4835 | agent_mem_read (tframe, cnv.u8.bytes, (CORE_ADDR) top, 1); | |
4836 | top = cnv.u8.val; | |
4837 | break; | |
4838 | ||
4839 | case gdb_agent_op_ref16: | |
4840 | agent_mem_read (tframe, cnv.u16.bytes, (CORE_ADDR) top, 2); | |
4841 | top = cnv.u16.val; | |
4842 | break; | |
4843 | ||
4844 | case gdb_agent_op_ref32: | |
4845 | agent_mem_read (tframe, cnv.u32.bytes, (CORE_ADDR) top, 4); | |
4846 | top = cnv.u32.val; | |
4847 | break; | |
4848 | ||
4849 | case gdb_agent_op_ref64: | |
4850 | agent_mem_read (tframe, cnv.u64.bytes, (CORE_ADDR) top, 8); | |
4851 | top = cnv.u64.val; | |
4852 | break; | |
4853 | ||
4854 | case gdb_agent_op_if_goto: | |
4855 | if (top) | |
4856 | pc = (aexpr->bytes[pc] << 8) + (aexpr->bytes[pc + 1]); | |
4857 | else | |
4858 | pc += 2; | |
4859 | if (--sp >= 0) | |
4860 | top = stack[sp]; | |
4861 | break; | |
4862 | ||
4863 | case gdb_agent_op_goto: | |
4864 | pc = (aexpr->bytes[pc] << 8) + (aexpr->bytes[pc + 1]); | |
4865 | break; | |
4866 | ||
4867 | case gdb_agent_op_const8: | |
4868 | /* Flush the cached stack top. */ | |
4869 | stack[sp++] = top; | |
4870 | top = aexpr->bytes[pc++]; | |
4871 | break; | |
4872 | ||
4873 | case gdb_agent_op_const16: | |
4874 | /* Flush the cached stack top. */ | |
4875 | stack[sp++] = top; | |
4876 | top = aexpr->bytes[pc++]; | |
4877 | top = (top << 8) + aexpr->bytes[pc++]; | |
4878 | break; | |
4879 | ||
4880 | case gdb_agent_op_const32: | |
4881 | /* Flush the cached stack top. */ | |
4882 | stack[sp++] = top; | |
4883 | top = aexpr->bytes[pc++]; | |
4884 | top = (top << 8) + aexpr->bytes[pc++]; | |
4885 | top = (top << 8) + aexpr->bytes[pc++]; | |
4886 | top = (top << 8) + aexpr->bytes[pc++]; | |
4887 | break; | |
4888 | ||
4889 | case gdb_agent_op_const64: | |
4890 | /* Flush the cached stack top. */ | |
4891 | stack[sp++] = top; | |
4892 | top = aexpr->bytes[pc++]; | |
4893 | top = (top << 8) + aexpr->bytes[pc++]; | |
4894 | top = (top << 8) + aexpr->bytes[pc++]; | |
4895 | top = (top << 8) + aexpr->bytes[pc++]; | |
4896 | top = (top << 8) + aexpr->bytes[pc++]; | |
4897 | top = (top << 8) + aexpr->bytes[pc++]; | |
4898 | top = (top << 8) + aexpr->bytes[pc++]; | |
4899 | top = (top << 8) + aexpr->bytes[pc++]; | |
4900 | break; | |
4901 | ||
4902 | case gdb_agent_op_reg: | |
4903 | /* Flush the cached stack top. */ | |
4904 | stack[sp++] = top; | |
4905 | arg = aexpr->bytes[pc++]; | |
4906 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
4907 | { | |
4908 | int regnum = arg; | |
4909 | struct regcache *regcache; | |
4910 | ||
4911 | regcache = get_context_regcache (ctx); | |
4912 | ||
4913 | switch (register_size (regnum)) | |
4914 | { | |
4915 | case 8: | |
4916 | collect_register (regcache, regnum, cnv.u64.bytes); | |
4917 | top = cnv.u64.val; | |
4918 | break; | |
4919 | case 4: | |
4920 | collect_register (regcache, regnum, cnv.u32.bytes); | |
4921 | top = cnv.u32.val; | |
4922 | break; | |
4923 | case 2: | |
4924 | collect_register (regcache, regnum, cnv.u16.bytes); | |
4925 | top = cnv.u16.val; | |
4926 | break; | |
4927 | case 1: | |
4928 | collect_register (regcache, regnum, cnv.u8.bytes); | |
4929 | top = cnv.u8.val; | |
4930 | break; | |
4931 | default: | |
4932 | internal_error (__FILE__, __LINE__, | |
4933 | "unhandled register size"); | |
4934 | } | |
4935 | } | |
4936 | break; | |
4937 | ||
4938 | case gdb_agent_op_end: | |
4939 | trace_debug ("At end of expression, sp=%d, stack top cache=0x%s", | |
4940 | sp, pulongest (top)); | |
4941 | if (rslt) | |
4942 | { | |
4943 | if (sp <= 0) | |
4944 | { | |
4945 | /* This should be an error */ | |
4946 | trace_debug ("Stack is empty, nothing to return"); | |
4947 | return expr_eval_empty_stack; | |
4948 | } | |
4949 | *rslt = top; | |
4950 | } | |
4951 | return expr_eval_no_error; | |
4952 | ||
4953 | case gdb_agent_op_dup: | |
4954 | stack[sp++] = top; | |
4955 | break; | |
4956 | ||
4957 | case gdb_agent_op_pop: | |
4958 | if (--sp >= 0) | |
4959 | top = stack[sp]; | |
4960 | break; | |
4961 | ||
c7f96d2b TT |
4962 | case gdb_agent_op_pick: |
4963 | arg = aexpr->bytes[pc++]; | |
4964 | stack[sp] = top; | |
4965 | top = stack[sp - arg]; | |
4966 | ++sp; | |
4967 | break; | |
4968 | ||
4969 | case gdb_agent_op_rot: | |
4970 | { | |
4971 | ULONGEST tem = stack[sp - 1]; | |
4972 | ||
4973 | stack[sp - 1] = stack[sp - 2]; | |
4974 | stack[sp - 2] = top; | |
4975 | top = tem; | |
4976 | } | |
4977 | break; | |
4978 | ||
219f2f23 PA |
4979 | case gdb_agent_op_zero_ext: |
4980 | arg = aexpr->bytes[pc++]; | |
4981 | if (arg < (sizeof (LONGEST) * 8)) | |
4982 | top &= ((LONGEST) 1 << arg) - 1; | |
4983 | break; | |
4984 | ||
4985 | case gdb_agent_op_swap: | |
4986 | /* Interchange top two stack elements, making sure top gets | |
4987 | copied back onto stack. */ | |
4988 | stack[sp] = top; | |
4989 | top = stack[sp - 1]; | |
4990 | stack[sp - 1] = stack[sp]; | |
4991 | break; | |
4992 | ||
4993 | case gdb_agent_op_getv: | |
4994 | /* Flush the cached stack top. */ | |
4995 | stack[sp++] = top; | |
4996 | arg = aexpr->bytes[pc++]; | |
4997 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
4998 | top = get_trace_state_variable_value (arg); | |
4999 | break; | |
5000 | ||
5001 | case gdb_agent_op_setv: | |
5002 | arg = aexpr->bytes[pc++]; | |
5003 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
5004 | set_trace_state_variable_value (arg, top); | |
5005 | /* Note that we leave the value on the stack, for the | |
5006 | benefit of later/enclosing expressions. */ | |
5007 | break; | |
5008 | ||
5009 | case gdb_agent_op_tracev: | |
5010 | arg = aexpr->bytes[pc++]; | |
5011 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
5012 | agent_tsv_read (tframe, arg); | |
5013 | break; | |
5014 | ||
3065dfb6 SS |
5015 | case gdb_agent_op_tracenz: |
5016 | agent_mem_read_string (tframe, NULL, (CORE_ADDR) stack[--sp], | |
5017 | (ULONGEST) top); | |
5018 | if (--sp >= 0) | |
5019 | top = stack[sp]; | |
5020 | break; | |
5021 | ||
219f2f23 PA |
5022 | /* GDB never (currently) generates any of these ops. */ |
5023 | case gdb_agent_op_float: | |
5024 | case gdb_agent_op_ref_float: | |
5025 | case gdb_agent_op_ref_double: | |
5026 | case gdb_agent_op_ref_long_double: | |
5027 | case gdb_agent_op_l_to_d: | |
5028 | case gdb_agent_op_d_to_l: | |
5029 | case gdb_agent_op_trace16: | |
5030 | trace_debug ("Agent expression op 0x%x valid, but not handled", | |
5031 | op); | |
5032 | /* If ever GDB generates any of these, we don't have the | |
5033 | option of ignoring. */ | |
5034 | return 1; | |
5035 | ||
5036 | default: | |
5037 | trace_debug ("Agent expression op 0x%x not recognized", op); | |
5038 | /* Don't struggle on, things will just get worse. */ | |
5039 | return expr_eval_unrecognized_opcode; | |
5040 | } | |
5041 | ||
5042 | /* Check for stack badness. */ | |
5043 | if (sp >= (STACK_MAX - 1)) | |
5044 | { | |
5045 | trace_debug ("Expression stack overflow"); | |
5046 | return expr_eval_stack_overflow; | |
5047 | } | |
5048 | ||
5049 | if (sp < 0) | |
5050 | { | |
5051 | trace_debug ("Expression stack underflow"); | |
5052 | return expr_eval_stack_underflow; | |
5053 | } | |
5054 | ||
5055 | trace_debug ("Op %s -> sp=%d, top=0x%s", | |
94d5e490 | 5056 | gdb_agent_op_name (op), sp, pulongest (top)); |
219f2f23 PA |
5057 | } |
5058 | } | |
5059 | ||
5060 | /* Do memory copies for bytecodes. */ | |
5061 | /* Do the recording of memory blocks for actions and bytecodes. */ | |
5062 | ||
5063 | static int | |
5064 | agent_mem_read (struct traceframe *tframe, | |
5065 | unsigned char *to, CORE_ADDR from, ULONGEST len) | |
5066 | { | |
5067 | unsigned char *mspace; | |
5068 | ULONGEST remaining = len; | |
5069 | unsigned short blocklen; | |
5070 | ||
5071 | /* If a 'to' buffer is specified, use it. */ | |
5072 | if (to != NULL) | |
5073 | { | |
5074 | read_inferior_memory (from, to, len); | |
5075 | return 0; | |
5076 | } | |
5077 | ||
5078 | /* Otherwise, create a new memory block in the trace buffer. */ | |
5079 | while (remaining > 0) | |
5080 | { | |
5081 | size_t sp; | |
5082 | ||
5083 | blocklen = (remaining > 65535 ? 65535 : remaining); | |
5084 | sp = 1 + sizeof (from) + sizeof (blocklen) + blocklen; | |
5085 | mspace = add_traceframe_block (tframe, sp); | |
5086 | if (mspace == NULL) | |
5087 | return 1; | |
5088 | /* Identify block as a memory block. */ | |
5089 | *mspace = 'M'; | |
5090 | ++mspace; | |
5091 | /* Record address and size. */ | |
5092 | memcpy (mspace, &from, sizeof (from)); | |
5093 | mspace += sizeof (from); | |
5094 | memcpy (mspace, &blocklen, sizeof (blocklen)); | |
5095 | mspace += sizeof (blocklen); | |
5096 | /* Record the memory block proper. */ | |
5097 | read_inferior_memory (from, mspace, blocklen); | |
5098 | trace_debug ("%d bytes recorded", blocklen); | |
5099 | remaining -= blocklen; | |
5100 | from += blocklen; | |
5101 | } | |
5102 | return 0; | |
5103 | } | |
5104 | ||
3065dfb6 SS |
5105 | static int |
5106 | agent_mem_read_string (struct traceframe *tframe, | |
5107 | unsigned char *to, CORE_ADDR from, ULONGEST len) | |
5108 | { | |
5109 | unsigned char *buf, *mspace; | |
5110 | ULONGEST remaining = len; | |
5111 | unsigned short blocklen, i; | |
5112 | ||
5113 | /* To save a bit of space, block lengths are 16-bit, so break large | |
5114 | requests into multiple blocks. Bordering on overkill for strings, | |
5115 | but it could happen that someone specifies a large max length. */ | |
5116 | while (remaining > 0) | |
5117 | { | |
5118 | size_t sp; | |
5119 | ||
5120 | blocklen = (remaining > 65535 ? 65535 : remaining); | |
5121 | /* We want working space to accumulate nonzero bytes, since | |
5122 | traceframes must have a predecided size (otherwise it gets | |
5123 | harder to wrap correctly for the circular case, etc). */ | |
5124 | buf = (unsigned char *) xmalloc (blocklen + 1); | |
5125 | for (i = 0; i < blocklen; ++i) | |
5126 | { | |
5127 | /* Read the string one byte at a time, in case the string is | |
5128 | at the end of a valid memory area - we don't want a | |
5129 | correctly-terminated string to engender segvio | |
5130 | complaints. */ | |
5131 | read_inferior_memory (from + i, buf + i, 1); | |
5132 | ||
5133 | if (buf[i] == '\0') | |
5134 | { | |
5135 | blocklen = i + 1; | |
5136 | /* Make sure outer loop stops now too. */ | |
5137 | remaining = blocklen; | |
5138 | break; | |
5139 | } | |
5140 | } | |
5141 | sp = 1 + sizeof (from) + sizeof (blocklen) + blocklen; | |
5142 | mspace = add_traceframe_block (tframe, sp); | |
5143 | if (mspace == NULL) | |
5144 | { | |
5145 | xfree (buf); | |
5146 | return 1; | |
5147 | } | |
5148 | /* Identify block as a memory block. */ | |
5149 | *mspace = 'M'; | |
5150 | ++mspace; | |
5151 | /* Record address and size. */ | |
5152 | memcpy ((void *) mspace, (void *) &from, sizeof (from)); | |
5153 | mspace += sizeof (from); | |
5154 | memcpy ((void *) mspace, (void *) &blocklen, sizeof (blocklen)); | |
5155 | mspace += sizeof (blocklen); | |
5156 | /* Copy the string contents. */ | |
5157 | memcpy ((void *) mspace, (void *) buf, blocklen); | |
5158 | remaining -= blocklen; | |
5159 | from += blocklen; | |
5160 | xfree (buf); | |
5161 | } | |
5162 | return 0; | |
5163 | } | |
5164 | ||
219f2f23 PA |
5165 | /* Record the value of a trace state variable. */ |
5166 | ||
5167 | static int | |
5168 | agent_tsv_read (struct traceframe *tframe, int n) | |
5169 | { | |
5170 | unsigned char *vspace; | |
5171 | LONGEST val; | |
5172 | ||
5173 | vspace = add_traceframe_block (tframe, | |
5174 | 1 + sizeof (n) + sizeof (LONGEST)); | |
5175 | if (vspace == NULL) | |
5176 | return 1; | |
5177 | /* Identify block as a variable. */ | |
5178 | *vspace = 'V'; | |
5179 | /* Record variable's number and value. */ | |
5180 | memcpy (vspace + 1, &n, sizeof (n)); | |
5181 | val = get_trace_state_variable_value (n); | |
5182 | memcpy (vspace + 1 + sizeof (n), &val, sizeof (val)); | |
5183 | trace_debug ("Variable %d recorded", n); | |
5184 | return 0; | |
5185 | } | |
5186 | ||
fa593d66 PA |
5187 | #ifndef IN_PROCESS_AGENT |
5188 | ||
b3b9301e PA |
5189 | /* Callback for traceframe_walk_blocks, used to find a given block |
5190 | type in a traceframe. */ | |
5191 | ||
5192 | static int | |
5193 | match_blocktype (char blocktype, unsigned char *dataptr, void *data) | |
5194 | { | |
5195 | char *wantedp = data; | |
5196 | ||
5197 | if (*wantedp == blocktype) | |
5198 | return 1; | |
5199 | ||
5200 | return 0; | |
5201 | } | |
5202 | ||
5203 | /* Walk over all traceframe blocks of the traceframe buffer starting | |
5204 | at DATABASE, of DATASIZE bytes long, and call CALLBACK for each | |
5205 | block found, passing in DATA unmodified. If CALLBACK returns true, | |
5206 | this returns a pointer to where the block is found. Returns NULL | |
5207 | if no callback call returned true, indicating that all blocks have | |
5208 | been walked. */ | |
5209 | ||
219f2f23 | 5210 | static unsigned char * |
b3b9301e PA |
5211 | traceframe_walk_blocks (unsigned char *database, unsigned int datasize, |
5212 | int tfnum, | |
5213 | int (*callback) (char blocktype, | |
5214 | unsigned char *dataptr, | |
5215 | void *data), | |
5216 | void *data) | |
219f2f23 PA |
5217 | { |
5218 | unsigned char *dataptr; | |
5219 | ||
5220 | if (datasize == 0) | |
5221 | { | |
5222 | trace_debug ("traceframe %d has no data", tfnum); | |
5223 | return NULL; | |
5224 | } | |
5225 | ||
5226 | /* Iterate through a traceframe's blocks, looking for a block of the | |
5227 | requested type. */ | |
5228 | for (dataptr = database; | |
5229 | dataptr < database + datasize; | |
5230 | /* nothing */) | |
5231 | { | |
5232 | char blocktype; | |
5233 | unsigned short mlen; | |
5234 | ||
5235 | if (dataptr == trace_buffer_wrap) | |
5236 | { | |
5237 | /* Adjust to reflect wrapping part of the frame around to | |
5238 | the beginning. */ | |
5239 | datasize = dataptr - database; | |
5240 | dataptr = database = trace_buffer_lo; | |
5241 | } | |
b3b9301e | 5242 | |
219f2f23 PA |
5243 | blocktype = *dataptr++; |
5244 | ||
b3b9301e | 5245 | if ((*callback) (blocktype, dataptr, data)) |
219f2f23 PA |
5246 | return dataptr; |
5247 | ||
5248 | switch (blocktype) | |
5249 | { | |
5250 | case 'R': | |
5251 | /* Skip over the registers block. */ | |
5252 | dataptr += register_cache_size (); | |
5253 | break; | |
5254 | case 'M': | |
5255 | /* Skip over the memory block. */ | |
5256 | dataptr += sizeof (CORE_ADDR); | |
5257 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5258 | dataptr += (sizeof (mlen) + mlen); | |
5259 | break; | |
219f2f23 PA |
5260 | case 'V': |
5261 | /* Skip over the TSV block. */ | |
5262 | dataptr += (sizeof (int) + sizeof (LONGEST)); | |
5263 | break; | |
0fb4aa4b PA |
5264 | case 'S': |
5265 | /* Skip over the static trace data block. */ | |
5266 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5267 | dataptr += (sizeof (mlen) + mlen); | |
5268 | break; | |
219f2f23 PA |
5269 | default: |
5270 | trace_debug ("traceframe %d has unknown block type 0x%x", | |
5271 | tfnum, blocktype); | |
5272 | return NULL; | |
5273 | } | |
5274 | } | |
5275 | ||
5276 | return NULL; | |
5277 | } | |
5278 | ||
b3b9301e PA |
5279 | /* Look for the block of type TYPE_WANTED in the trameframe starting |
5280 | at DATABASE of DATASIZE bytes long. TFNUM is the traceframe | |
5281 | number. */ | |
5282 | ||
5283 | static unsigned char * | |
5284 | traceframe_find_block_type (unsigned char *database, unsigned int datasize, | |
5285 | int tfnum, char type_wanted) | |
5286 | { | |
5287 | return traceframe_walk_blocks (database, datasize, tfnum, | |
5288 | match_blocktype, &type_wanted); | |
5289 | } | |
5290 | ||
219f2f23 PA |
5291 | static unsigned char * |
5292 | traceframe_find_regblock (struct traceframe *tframe, int tfnum) | |
5293 | { | |
5294 | unsigned char *regblock; | |
5295 | ||
5296 | regblock = traceframe_find_block_type (tframe->data, | |
5297 | tframe->data_size, | |
5298 | tfnum, 'R'); | |
5299 | ||
5300 | if (regblock == NULL) | |
5301 | trace_debug ("traceframe %d has no register data", tfnum); | |
5302 | ||
5303 | return regblock; | |
5304 | } | |
5305 | ||
5306 | /* Get registers from a traceframe. */ | |
5307 | ||
5308 | int | |
5309 | fetch_traceframe_registers (int tfnum, struct regcache *regcache, int regnum) | |
5310 | { | |
5311 | unsigned char *dataptr; | |
5312 | struct tracepoint *tpoint; | |
5313 | struct traceframe *tframe; | |
5314 | ||
5315 | tframe = find_traceframe (tfnum); | |
5316 | ||
5317 | if (tframe == NULL) | |
5318 | { | |
5319 | trace_debug ("traceframe %d not found", tfnum); | |
5320 | return 1; | |
5321 | } | |
5322 | ||
5323 | dataptr = traceframe_find_regblock (tframe, tfnum); | |
5324 | if (dataptr == NULL) | |
5325 | { | |
1c79eb8a | 5326 | /* Mark registers unavailable. */ |
219f2f23 PA |
5327 | supply_regblock (regcache, NULL); |
5328 | ||
5329 | /* We can generally guess at a PC, although this will be | |
5330 | misleading for while-stepping frames and multi-location | |
5331 | tracepoints. */ | |
5332 | tpoint = find_next_tracepoint_by_number (NULL, tframe->tpnum); | |
5333 | if (tpoint != NULL) | |
5334 | regcache_write_pc (regcache, tpoint->address); | |
5335 | } | |
5336 | else | |
5337 | supply_regblock (regcache, dataptr); | |
5338 | ||
5339 | return 0; | |
5340 | } | |
5341 | ||
5342 | static CORE_ADDR | |
5343 | traceframe_get_pc (struct traceframe *tframe) | |
5344 | { | |
5345 | struct regcache regcache; | |
5346 | unsigned char *dataptr; | |
5347 | ||
5348 | dataptr = traceframe_find_regblock (tframe, -1); | |
5349 | if (dataptr == NULL) | |
5350 | return 0; | |
5351 | ||
5352 | init_register_cache (®cache, dataptr); | |
5353 | return regcache_read_pc (®cache); | |
5354 | } | |
5355 | ||
5356 | /* Read a requested block of memory from a trace frame. */ | |
5357 | ||
5358 | int | |
5359 | traceframe_read_mem (int tfnum, CORE_ADDR addr, | |
5360 | unsigned char *buf, ULONGEST length, | |
5361 | ULONGEST *nbytes) | |
5362 | { | |
5363 | struct traceframe *tframe; | |
5364 | unsigned char *database, *dataptr; | |
5365 | unsigned int datasize; | |
5366 | CORE_ADDR maddr; | |
5367 | unsigned short mlen; | |
5368 | ||
5369 | trace_debug ("traceframe_read_mem"); | |
5370 | ||
5371 | tframe = find_traceframe (tfnum); | |
5372 | ||
5373 | if (!tframe) | |
5374 | { | |
5375 | trace_debug ("traceframe %d not found", tfnum); | |
5376 | return 1; | |
5377 | } | |
5378 | ||
5379 | datasize = tframe->data_size; | |
5380 | database = dataptr = &tframe->data[0]; | |
5381 | ||
5382 | /* Iterate through a traceframe's blocks, looking for memory. */ | |
5383 | while ((dataptr = traceframe_find_block_type (dataptr, | |
493e2a69 MS |
5384 | datasize |
5385 | - (dataptr - database), | |
219f2f23 PA |
5386 | tfnum, 'M')) != NULL) |
5387 | { | |
5388 | memcpy (&maddr, dataptr, sizeof (maddr)); | |
5389 | dataptr += sizeof (maddr); | |
5390 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5391 | dataptr += sizeof (mlen); | |
5392 | trace_debug ("traceframe %d has %d bytes at %s", | |
5393 | tfnum, mlen, paddress (maddr)); | |
5394 | ||
764880b7 PA |
5395 | /* If the block includes the first part of the desired range, |
5396 | return as much it has; GDB will re-request the remainder, | |
5397 | which might be in a different block of this trace frame. */ | |
5398 | if (maddr <= addr && addr < (maddr + mlen)) | |
219f2f23 | 5399 | { |
764880b7 PA |
5400 | ULONGEST amt = (maddr + mlen) - addr; |
5401 | if (amt > length) | |
5402 | amt = length; | |
5403 | ||
5404 | memcpy (buf, dataptr + (addr - maddr), amt); | |
5405 | *nbytes = amt; | |
219f2f23 PA |
5406 | return 0; |
5407 | } | |
5408 | ||
5409 | /* Skip over this block. */ | |
5410 | dataptr += mlen; | |
5411 | } | |
5412 | ||
5413 | trace_debug ("traceframe %d has no memory data for the desired region", | |
5414 | tfnum); | |
5415 | ||
5416 | *nbytes = 0; | |
5417 | return 0; | |
5418 | } | |
5419 | ||
5420 | static int | |
5421 | traceframe_read_tsv (int tsvnum, LONGEST *val) | |
5422 | { | |
5423 | int tfnum; | |
5424 | struct traceframe *tframe; | |
5425 | unsigned char *database, *dataptr; | |
5426 | unsigned int datasize; | |
5427 | int vnum; | |
5428 | ||
5429 | trace_debug ("traceframe_read_tsv"); | |
5430 | ||
5431 | tfnum = current_traceframe; | |
5432 | ||
5433 | if (tfnum < 0) | |
5434 | { | |
5435 | trace_debug ("no current traceframe"); | |
5436 | return 1; | |
5437 | } | |
5438 | ||
5439 | tframe = find_traceframe (tfnum); | |
5440 | ||
5441 | if (tframe == NULL) | |
5442 | { | |
5443 | trace_debug ("traceframe %d not found", tfnum); | |
5444 | return 1; | |
5445 | } | |
5446 | ||
5447 | datasize = tframe->data_size; | |
5448 | database = dataptr = &tframe->data[0]; | |
5449 | ||
5450 | /* Iterate through a traceframe's blocks, looking for the tsv. */ | |
5451 | while ((dataptr = traceframe_find_block_type (dataptr, | |
493e2a69 MS |
5452 | datasize |
5453 | - (dataptr - database), | |
219f2f23 PA |
5454 | tfnum, 'V')) != NULL) |
5455 | { | |
5456 | memcpy (&vnum, dataptr, sizeof (vnum)); | |
5457 | dataptr += sizeof (vnum); | |
5458 | ||
5459 | trace_debug ("traceframe %d has variable %d", tfnum, vnum); | |
5460 | ||
5461 | /* Check that this is the variable we want. */ | |
5462 | if (tsvnum == vnum) | |
5463 | { | |
5464 | memcpy (val, dataptr, sizeof (*val)); | |
5465 | return 0; | |
5466 | } | |
5467 | ||
5468 | /* Skip over this block. */ | |
5469 | dataptr += sizeof (LONGEST); | |
5470 | } | |
5471 | ||
5472 | trace_debug ("traceframe %d has no data for variable %d", | |
5473 | tfnum, tsvnum); | |
5474 | return 1; | |
5475 | } | |
5476 | ||
0fb4aa4b PA |
5477 | /* Read a requested block of static tracepoint data from a trace |
5478 | frame. */ | |
5479 | ||
5480 | int | |
5481 | traceframe_read_sdata (int tfnum, ULONGEST offset, | |
5482 | unsigned char *buf, ULONGEST length, | |
5483 | ULONGEST *nbytes) | |
5484 | { | |
5485 | struct traceframe *tframe; | |
5486 | unsigned char *database, *dataptr; | |
5487 | unsigned int datasize; | |
5488 | unsigned short mlen; | |
5489 | ||
5490 | trace_debug ("traceframe_read_sdata"); | |
5491 | ||
5492 | tframe = find_traceframe (tfnum); | |
5493 | ||
5494 | if (!tframe) | |
5495 | { | |
5496 | trace_debug ("traceframe %d not found", tfnum); | |
5497 | return 1; | |
5498 | } | |
5499 | ||
5500 | datasize = tframe->data_size; | |
5501 | database = &tframe->data[0]; | |
5502 | ||
5503 | /* Iterate through a traceframe's blocks, looking for static | |
5504 | tracepoint data. */ | |
5505 | dataptr = traceframe_find_block_type (database, datasize, | |
5506 | tfnum, 'S'); | |
5507 | if (dataptr != NULL) | |
5508 | { | |
5509 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5510 | dataptr += sizeof (mlen); | |
5511 | if (offset < mlen) | |
5512 | { | |
5513 | if (offset + length > mlen) | |
5514 | length = mlen - offset; | |
5515 | ||
5516 | memcpy (buf, dataptr, length); | |
5517 | *nbytes = length; | |
5518 | } | |
5519 | else | |
5520 | *nbytes = 0; | |
5521 | return 0; | |
5522 | } | |
5523 | ||
5524 | trace_debug ("traceframe %d has no static trace data", tfnum); | |
5525 | ||
5526 | *nbytes = 0; | |
5527 | return 0; | |
5528 | } | |
5529 | ||
b3b9301e PA |
5530 | /* Callback for traceframe_walk_blocks. Builds a traceframe-info |
5531 | object. DATA is pointer to a struct buffer holding the | |
5532 | traceframe-info object being built. */ | |
5533 | ||
5534 | static int | |
5535 | build_traceframe_info_xml (char blocktype, unsigned char *dataptr, void *data) | |
5536 | { | |
5537 | struct buffer *buffer = data; | |
5538 | ||
5539 | switch (blocktype) | |
5540 | { | |
5541 | case 'M': | |
5542 | { | |
5543 | unsigned short mlen; | |
5544 | CORE_ADDR maddr; | |
5545 | ||
5546 | memcpy (&maddr, dataptr, sizeof (maddr)); | |
5547 | dataptr += sizeof (maddr); | |
5548 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5549 | dataptr += sizeof (mlen); | |
5550 | buffer_xml_printf (buffer, | |
5551 | "<memory start=\"0x%s\" length=\"0x%s\"/>\n", | |
5552 | paddress (maddr), phex_nz (mlen, sizeof (mlen))); | |
5553 | break; | |
5554 | } | |
5555 | case 'V': | |
5556 | case 'R': | |
5557 | case 'S': | |
5558 | { | |
5559 | break; | |
5560 | } | |
5561 | default: | |
5562 | warning ("Unhandled trace block type (%d) '%c ' " | |
5563 | "while building trace frame info.", | |
5564 | blocktype, blocktype); | |
5565 | break; | |
5566 | } | |
5567 | ||
5568 | return 0; | |
5569 | } | |
5570 | ||
5571 | /* Build a traceframe-info object for traceframe number TFNUM into | |
5572 | BUFFER. */ | |
5573 | ||
5574 | int | |
5575 | traceframe_read_info (int tfnum, struct buffer *buffer) | |
5576 | { | |
5577 | struct traceframe *tframe; | |
5578 | ||
5579 | trace_debug ("traceframe_read_info"); | |
5580 | ||
5581 | tframe = find_traceframe (tfnum); | |
5582 | ||
5583 | if (!tframe) | |
5584 | { | |
5585 | trace_debug ("traceframe %d not found", tfnum); | |
5586 | return 1; | |
5587 | } | |
5588 | ||
5589 | buffer_grow_str (buffer, "<traceframe-info>\n"); | |
5590 | traceframe_walk_blocks (tframe->data, tframe->data_size, | |
5591 | tfnum, build_traceframe_info_xml, buffer); | |
5592 | buffer_grow_str0 (buffer, "</traceframe-info>\n"); | |
5593 | return 0; | |
5594 | } | |
5595 | ||
fa593d66 PA |
5596 | /* Return the first fast tracepoint whose jump pad contains PC. */ |
5597 | ||
5598 | static struct tracepoint * | |
5599 | fast_tracepoint_from_jump_pad_address (CORE_ADDR pc) | |
5600 | { | |
5601 | struct tracepoint *tpoint; | |
5602 | ||
5603 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
5604 | if (tpoint->type == fast_tracepoint) | |
5605 | if (tpoint->jump_pad <= pc && pc < tpoint->jump_pad_end) | |
5606 | return tpoint; | |
5607 | ||
5608 | return NULL; | |
5609 | } | |
5610 | ||
405f8e94 SS |
5611 | /* Return the first fast tracepoint whose trampoline contains PC. */ |
5612 | ||
5613 | static struct tracepoint * | |
5614 | fast_tracepoint_from_trampoline_address (CORE_ADDR pc) | |
5615 | { | |
5616 | struct tracepoint *tpoint; | |
5617 | ||
5618 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
5619 | { | |
5620 | if (tpoint->type == fast_tracepoint | |
5621 | && tpoint->trampoline <= pc && pc < tpoint->trampoline_end) | |
5622 | return tpoint; | |
5623 | } | |
5624 | ||
5625 | return NULL; | |
5626 | } | |
5627 | ||
fa593d66 PA |
5628 | /* Return GDBserver's tracepoint that matches the IP Agent's |
5629 | tracepoint object that lives at IPA_TPOINT_OBJ in the IP Agent's | |
5630 | address space. */ | |
5631 | ||
5632 | static struct tracepoint * | |
5633 | fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR ipa_tpoint_obj) | |
5634 | { | |
5635 | struct tracepoint *tpoint; | |
5636 | ||
5637 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
5638 | if (tpoint->type == fast_tracepoint) | |
5639 | if (tpoint->obj_addr_on_target == ipa_tpoint_obj) | |
5640 | return tpoint; | |
5641 | ||
5642 | return NULL; | |
5643 | } | |
5644 | ||
5645 | #endif | |
5646 | ||
5647 | /* The type of the object that is used to synchronize fast tracepoint | |
5648 | collection. */ | |
5649 | ||
5650 | typedef struct collecting_t | |
5651 | { | |
5652 | /* The fast tracepoint number currently collecting. */ | |
5653 | uintptr_t tpoint; | |
5654 | ||
5655 | /* A number that GDBserver can use to identify the thread that is | |
5656 | presently holding the collect lock. This need not (and usually | |
5657 | is not) the thread id, as getting the current thread ID usually | |
5658 | requires a system call, which we want to avoid like the plague. | |
5659 | Usually this is thread's TCB, found in the TLS (pseudo-) | |
5660 | register, which is readable with a single insn on several | |
5661 | architectures. */ | |
5662 | uintptr_t thread_area; | |
5663 | } collecting_t; | |
5664 | ||
5665 | #ifndef IN_PROCESS_AGENT | |
5666 | ||
5667 | void | |
5668 | force_unlock_trace_buffer (void) | |
5669 | { | |
5670 | write_inferior_data_pointer (ipa_sym_addrs.addr_collecting, 0); | |
5671 | } | |
5672 | ||
5673 | /* Check if the thread identified by THREAD_AREA which is stopped at | |
5674 | STOP_PC, is presently locking the fast tracepoint collection, and | |
5675 | if so, gather some status of said collection. Returns 0 if the | |
5676 | thread isn't collecting or in the jump pad at all. 1, if in the | |
5677 | jump pad (or within gdb_collect) and hasn't executed the adjusted | |
5678 | original insn yet (can set a breakpoint there and run to it). 2, | |
5679 | if presently executing the adjusted original insn --- in which | |
5680 | case, if we want to move the thread out of the jump pad, we need to | |
5681 | single-step it until this function returns 0. */ | |
5682 | ||
5683 | int | |
5684 | fast_tracepoint_collecting (CORE_ADDR thread_area, | |
5685 | CORE_ADDR stop_pc, | |
5686 | struct fast_tpoint_collect_status *status) | |
5687 | { | |
5688 | CORE_ADDR ipa_collecting; | |
5689 | CORE_ADDR ipa_gdb_jump_pad_buffer, ipa_gdb_jump_pad_buffer_end; | |
405f8e94 SS |
5690 | CORE_ADDR ipa_gdb_trampoline_buffer; |
5691 | CORE_ADDR ipa_gdb_trampoline_buffer_end; | |
fa593d66 PA |
5692 | struct tracepoint *tpoint; |
5693 | int needs_breakpoint; | |
5694 | ||
5695 | /* The thread THREAD_AREA is either: | |
5696 | ||
5697 | 0. not collecting at all, not within the jump pad, or within | |
5698 | gdb_collect or one of its callees. | |
5699 | ||
5700 | 1. in the jump pad and haven't reached gdb_collect | |
5701 | ||
5702 | 2. within gdb_collect (out of the jump pad) (collect is set) | |
5703 | ||
5704 | 3. we're in the jump pad, after gdb_collect having returned, | |
5705 | possibly executing the adjusted insns. | |
5706 | ||
5707 | For cases 1 and 3, `collecting' may or not be set. The jump pad | |
5708 | doesn't have any complicated jump logic, so we can tell if the | |
5709 | thread is executing the adjust original insn or not by just | |
5710 | matching STOP_PC with known jump pad addresses. If we it isn't | |
5711 | yet executing the original insn, set a breakpoint there, and let | |
5712 | the thread run to it, so to quickly step over a possible (many | |
5713 | insns) gdb_collect call. Otherwise, or when the breakpoint is | |
5714 | hit, only a few (small number of) insns are left to be executed | |
5715 | in the jump pad. Single-step the thread until it leaves the | |
5716 | jump pad. */ | |
5717 | ||
5718 | again: | |
5719 | tpoint = NULL; | |
5720 | needs_breakpoint = 0; | |
5721 | trace_debug ("fast_tracepoint_collecting"); | |
5722 | ||
5723 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer, | |
5724 | &ipa_gdb_jump_pad_buffer)) | |
5725 | fatal ("error extracting `gdb_jump_pad_buffer'"); | |
5726 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer_end, | |
5727 | &ipa_gdb_jump_pad_buffer_end)) | |
5728 | fatal ("error extracting `gdb_jump_pad_buffer_end'"); | |
5729 | ||
405f8e94 SS |
5730 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer, |
5731 | &ipa_gdb_trampoline_buffer)) | |
5732 | fatal ("error extracting `gdb_trampoline_buffer'"); | |
5733 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_end, | |
5734 | &ipa_gdb_trampoline_buffer_end)) | |
5735 | fatal ("error extracting `gdb_trampoline_buffer_end'"); | |
5736 | ||
493e2a69 MS |
5737 | if (ipa_gdb_jump_pad_buffer <= stop_pc |
5738 | && stop_pc < ipa_gdb_jump_pad_buffer_end) | |
fa593d66 PA |
5739 | { |
5740 | /* We can tell which tracepoint(s) the thread is collecting by | |
5741 | matching the jump pad address back to the tracepoint. */ | |
5742 | tpoint = fast_tracepoint_from_jump_pad_address (stop_pc); | |
5743 | if (tpoint == NULL) | |
5744 | { | |
5745 | warning ("in jump pad, but no matching tpoint?"); | |
5746 | return 0; | |
5747 | } | |
5748 | else | |
5749 | { | |
5750 | trace_debug ("in jump pad of tpoint (%d, %s); jump_pad(%s, %s); " | |
5751 | "adj_insn(%s, %s)", | |
5752 | tpoint->number, paddress (tpoint->address), | |
5753 | paddress (tpoint->jump_pad), | |
5754 | paddress (tpoint->jump_pad_end), | |
5755 | paddress (tpoint->adjusted_insn_addr), | |
5756 | paddress (tpoint->adjusted_insn_addr_end)); | |
5757 | } | |
5758 | ||
5759 | /* Definitely in the jump pad. May or may not need | |
5760 | fast-exit-jump-pad breakpoint. */ | |
5761 | if (tpoint->jump_pad <= stop_pc | |
5762 | && stop_pc < tpoint->adjusted_insn_addr) | |
5763 | needs_breakpoint = 1; | |
5764 | } | |
405f8e94 SS |
5765 | else if (ipa_gdb_trampoline_buffer <= stop_pc |
5766 | && stop_pc < ipa_gdb_trampoline_buffer_end) | |
5767 | { | |
5768 | /* We can tell which tracepoint(s) the thread is collecting by | |
5769 | matching the trampoline address back to the tracepoint. */ | |
5770 | tpoint = fast_tracepoint_from_trampoline_address (stop_pc); | |
5771 | if (tpoint == NULL) | |
5772 | { | |
5773 | warning ("in trampoline, but no matching tpoint?"); | |
5774 | return 0; | |
5775 | } | |
5776 | else | |
5777 | { | |
5778 | trace_debug ("in trampoline of tpoint (%d, %s); trampoline(%s, %s)", | |
5779 | tpoint->number, paddress (tpoint->address), | |
5780 | paddress (tpoint->trampoline), | |
5781 | paddress (tpoint->trampoline_end)); | |
5782 | } | |
5783 | ||
5784 | /* Have not reached jump pad yet, but treat the trampoline as a | |
5785 | part of the jump pad that is before the adjusted original | |
5786 | instruction. */ | |
5787 | needs_breakpoint = 1; | |
5788 | } | |
fa593d66 PA |
5789 | else |
5790 | { | |
5791 | collecting_t ipa_collecting_obj; | |
5792 | ||
5793 | /* If `collecting' is set/locked, then the THREAD_AREA thread | |
5794 | may or not be the one holding the lock. We have to read the | |
5795 | lock to find out. */ | |
5796 | ||
5797 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_collecting, | |
5798 | &ipa_collecting)) | |
5799 | { | |
5800 | trace_debug ("fast_tracepoint_collecting:" | |
5801 | " failed reading 'collecting' in the inferior"); | |
5802 | return 0; | |
5803 | } | |
5804 | ||
5805 | if (!ipa_collecting) | |
5806 | { | |
5807 | trace_debug ("fast_tracepoint_collecting: not collecting" | |
5808 | " (and nobody is)."); | |
5809 | return 0; | |
5810 | } | |
5811 | ||
5812 | /* Some thread is collecting. Check which. */ | |
5813 | if (read_inferior_memory (ipa_collecting, | |
5814 | (unsigned char *) &ipa_collecting_obj, | |
5815 | sizeof (ipa_collecting_obj)) != 0) | |
5816 | goto again; | |
5817 | ||
5818 | if (ipa_collecting_obj.thread_area != thread_area) | |
5819 | { | |
5820 | trace_debug ("fast_tracepoint_collecting: not collecting " | |
5821 | "(another thread is)"); | |
5822 | return 0; | |
5823 | } | |
5824 | ||
5825 | tpoint | |
5826 | = fast_tracepoint_from_ipa_tpoint_address (ipa_collecting_obj.tpoint); | |
5827 | if (tpoint == NULL) | |
5828 | { | |
5829 | warning ("fast_tracepoint_collecting: collecting, " | |
5830 | "but tpoint %s not found?", | |
5831 | paddress ((CORE_ADDR) ipa_collecting_obj.tpoint)); | |
5832 | return 0; | |
5833 | } | |
5834 | ||
5835 | /* The thread is within `gdb_collect', skip over the rest of | |
5836 | fast tracepoint collection quickly using a breakpoint. */ | |
5837 | needs_breakpoint = 1; | |
5838 | } | |
5839 | ||
5840 | /* The caller wants a bit of status detail. */ | |
5841 | if (status != NULL) | |
5842 | { | |
5843 | status->tpoint_num = tpoint->number; | |
5844 | status->tpoint_addr = tpoint->address; | |
5845 | status->adjusted_insn_addr = tpoint->adjusted_insn_addr; | |
5846 | status->adjusted_insn_addr_end = tpoint->adjusted_insn_addr_end; | |
5847 | } | |
5848 | ||
5849 | if (needs_breakpoint) | |
5850 | { | |
5851 | /* Hasn't executed the original instruction yet. Set breakpoint | |
5852 | there, and wait till it's hit, then single-step until exiting | |
5853 | the jump pad. */ | |
5854 | ||
5855 | trace_debug ("\ | |
5856 | fast_tracepoint_collecting, returning continue-until-break at %s", | |
5857 | paddress (tpoint->adjusted_insn_addr)); | |
5858 | ||
5859 | return 1; /* continue */ | |
5860 | } | |
5861 | else | |
5862 | { | |
5863 | /* Just single-step until exiting the jump pad. */ | |
5864 | ||
5865 | trace_debug ("fast_tracepoint_collecting, returning " | |
5866 | "need-single-step (%s-%s)", | |
5867 | paddress (tpoint->adjusted_insn_addr), | |
5868 | paddress (tpoint->adjusted_insn_addr_end)); | |
5869 | ||
5870 | return 2; /* single-step */ | |
5871 | } | |
5872 | } | |
5873 | ||
5874 | #endif | |
5875 | ||
5876 | #ifdef IN_PROCESS_AGENT | |
5877 | ||
5878 | /* The global fast tracepoint collect lock. Points to a collecting_t | |
5879 | object built on the stack by the jump pad, if presently locked; | |
5880 | NULL if it isn't locked. Note that this lock *must* be set while | |
5881 | executing any *function other than the jump pad. See | |
5882 | fast_tracepoint_collecting. */ | |
5883 | static collecting_t * ATTR_USED collecting; | |
5884 | ||
5885 | /* This routine, called from the jump pad (in asm) is designed to be | |
5886 | called from the jump pads of fast tracepoints, thus it is on the | |
5887 | critical path. */ | |
5888 | ||
5889 | IP_AGENT_EXPORT void ATTR_USED | |
5890 | gdb_collect (struct tracepoint *tpoint, unsigned char *regs) | |
5891 | { | |
5892 | struct fast_tracepoint_ctx ctx; | |
5893 | ||
5894 | /* Don't do anything until the trace run is completely set up. */ | |
5895 | if (!tracing) | |
5896 | return; | |
5897 | ||
5898 | ctx.base.type = fast_tracepoint; | |
5899 | ctx.regs = regs; | |
5900 | ctx.regcache_initted = 0; | |
fa593d66 PA |
5901 | /* Wrap the regblock in a register cache (in the stack, we don't |
5902 | want to malloc here). */ | |
5903 | ctx.regspace = alloca (register_cache_size ()); | |
5904 | if (ctx.regspace == NULL) | |
5905 | { | |
5906 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
5907 | return; | |
5908 | } | |
5909 | ||
a59306a3 YQ |
5910 | for (ctx.tpoint = tpoint; |
5911 | ctx.tpoint != NULL && ctx.tpoint->address == tpoint->address; | |
5912 | ctx.tpoint = ctx.tpoint->next) | |
fa593d66 | 5913 | { |
a59306a3 YQ |
5914 | if (!ctx.tpoint->enabled) |
5915 | continue; | |
fa593d66 | 5916 | |
a59306a3 YQ |
5917 | /* Multiple tracepoints of different types, such as fast tracepoint and |
5918 | static tracepoint, can be set at the same address. */ | |
5919 | if (ctx.tpoint->type != tpoint->type) | |
5920 | continue; | |
5921 | ||
5922 | /* Test the condition if present, and collect if true. */ | |
5923 | if (ctx.tpoint->cond == NULL | |
5924 | || condition_true_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
5925 | ctx.tpoint)) | |
5926 | { | |
5927 | collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
5928 | ctx.tpoint->address, ctx.tpoint); | |
5929 | ||
5930 | /* Note that this will cause original insns to be written back | |
5931 | to where we jumped from, but that's OK because we're jumping | |
5932 | back to the next whole instruction. This will go badly if | |
5933 | instruction restoration is not atomic though. */ | |
5934 | if (stopping_tracepoint | |
5935 | || trace_buffer_is_full | |
5936 | || expr_eval_result != expr_eval_no_error) | |
5937 | { | |
5938 | stop_tracing (); | |
5939 | break; | |
5940 | } | |
5941 | } | |
5942 | else | |
5943 | { | |
5944 | /* If there was a condition and it evaluated to false, the only | |
5945 | way we would stop tracing is if there was an error during | |
5946 | condition expression evaluation. */ | |
5947 | if (expr_eval_result != expr_eval_no_error) | |
5948 | { | |
5949 | stop_tracing (); | |
5950 | break; | |
5951 | } | |
5952 | } | |
fa593d66 PA |
5953 | } |
5954 | } | |
5955 | ||
5956 | #endif | |
5957 | ||
5958 | #ifndef IN_PROCESS_AGENT | |
5959 | ||
6a271cae PA |
5960 | /* Bytecode compilation. */ |
5961 | ||
5962 | CORE_ADDR current_insn_ptr; | |
5963 | ||
5964 | int emit_error; | |
5965 | ||
5966 | struct bytecode_address | |
5967 | { | |
5968 | int pc; | |
5969 | CORE_ADDR address; | |
5970 | int goto_pc; | |
5971 | /* Offset and size of field to be modified in the goto block. */ | |
5972 | int from_offset, from_size; | |
5973 | struct bytecode_address *next; | |
5974 | } *bytecode_address_table; | |
5975 | ||
5976 | CORE_ADDR | |
5977 | get_raw_reg_func_addr (void) | |
5978 | { | |
5979 | return ipa_sym_addrs.addr_get_raw_reg; | |
5980 | } | |
5981 | ||
5982 | static void | |
5983 | emit_prologue (void) | |
5984 | { | |
5985 | target_emit_ops ()->emit_prologue (); | |
5986 | } | |
5987 | ||
5988 | static void | |
5989 | emit_epilogue (void) | |
5990 | { | |
5991 | target_emit_ops ()->emit_epilogue (); | |
5992 | } | |
5993 | ||
5994 | static void | |
5995 | emit_add (void) | |
5996 | { | |
5997 | target_emit_ops ()->emit_add (); | |
5998 | } | |
5999 | ||
6000 | static void | |
6001 | emit_sub (void) | |
6002 | { | |
6003 | target_emit_ops ()->emit_sub (); | |
6004 | } | |
6005 | ||
6006 | static void | |
6007 | emit_mul (void) | |
6008 | { | |
6009 | target_emit_ops ()->emit_mul (); | |
6010 | } | |
6011 | ||
6012 | static void | |
6013 | emit_lsh (void) | |
6014 | { | |
6015 | target_emit_ops ()->emit_lsh (); | |
6016 | } | |
6017 | ||
6018 | static void | |
6019 | emit_rsh_signed (void) | |
6020 | { | |
6021 | target_emit_ops ()->emit_rsh_signed (); | |
6022 | } | |
6023 | ||
6024 | static void | |
6025 | emit_rsh_unsigned (void) | |
6026 | { | |
6027 | target_emit_ops ()->emit_rsh_unsigned (); | |
6028 | } | |
6029 | ||
6030 | static void | |
6031 | emit_ext (int arg) | |
6032 | { | |
6033 | target_emit_ops ()->emit_ext (arg); | |
6034 | } | |
6035 | ||
6036 | static void | |
6037 | emit_log_not (void) | |
6038 | { | |
6039 | target_emit_ops ()->emit_log_not (); | |
6040 | } | |
6041 | ||
6042 | static void | |
6043 | emit_bit_and (void) | |
6044 | { | |
6045 | target_emit_ops ()->emit_bit_and (); | |
6046 | } | |
6047 | ||
6048 | static void | |
6049 | emit_bit_or (void) | |
6050 | { | |
6051 | target_emit_ops ()->emit_bit_or (); | |
6052 | } | |
6053 | ||
6054 | static void | |
6055 | emit_bit_xor (void) | |
6056 | { | |
6057 | target_emit_ops ()->emit_bit_xor (); | |
6058 | } | |
6059 | ||
6060 | static void | |
6061 | emit_bit_not (void) | |
6062 | { | |
6063 | target_emit_ops ()->emit_bit_not (); | |
6064 | } | |
6065 | ||
6066 | static void | |
6067 | emit_equal (void) | |
6068 | { | |
6069 | target_emit_ops ()->emit_equal (); | |
6070 | } | |
6071 | ||
6072 | static void | |
6073 | emit_less_signed (void) | |
6074 | { | |
6075 | target_emit_ops ()->emit_less_signed (); | |
6076 | } | |
6077 | ||
6078 | static void | |
6079 | emit_less_unsigned (void) | |
6080 | { | |
6081 | target_emit_ops ()->emit_less_unsigned (); | |
6082 | } | |
6083 | ||
6084 | static void | |
6085 | emit_ref (int size) | |
6086 | { | |
6087 | target_emit_ops ()->emit_ref (size); | |
6088 | } | |
6089 | ||
6090 | static void | |
6091 | emit_if_goto (int *offset_p, int *size_p) | |
6092 | { | |
6093 | target_emit_ops ()->emit_if_goto (offset_p, size_p); | |
6094 | } | |
6095 | ||
6096 | static void | |
6097 | emit_goto (int *offset_p, int *size_p) | |
6098 | { | |
6099 | target_emit_ops ()->emit_goto (offset_p, size_p); | |
6100 | } | |
6101 | ||
6102 | static void | |
6103 | write_goto_address (CORE_ADDR from, CORE_ADDR to, int size) | |
6104 | { | |
6105 | target_emit_ops ()->write_goto_address (from, to, size); | |
6106 | } | |
6107 | ||
6108 | static void | |
4e29fb54 | 6109 | emit_const (LONGEST num) |
6a271cae PA |
6110 | { |
6111 | target_emit_ops ()->emit_const (num); | |
6112 | } | |
6113 | ||
6114 | static void | |
6115 | emit_reg (int reg) | |
6116 | { | |
6117 | target_emit_ops ()->emit_reg (reg); | |
6118 | } | |
6119 | ||
6120 | static void | |
6121 | emit_pop (void) | |
6122 | { | |
6123 | target_emit_ops ()->emit_pop (); | |
6124 | } | |
6125 | ||
6126 | static void | |
6127 | emit_stack_flush (void) | |
6128 | { | |
6129 | target_emit_ops ()->emit_stack_flush (); | |
6130 | } | |
6131 | ||
6132 | static void | |
6133 | emit_zero_ext (int arg) | |
6134 | { | |
6135 | target_emit_ops ()->emit_zero_ext (arg); | |
6136 | } | |
6137 | ||
6138 | static void | |
6139 | emit_swap (void) | |
6140 | { | |
6141 | target_emit_ops ()->emit_swap (); | |
6142 | } | |
6143 | ||
6144 | static void | |
6145 | emit_stack_adjust (int n) | |
6146 | { | |
6147 | target_emit_ops ()->emit_stack_adjust (n); | |
6148 | } | |
6149 | ||
6150 | /* FN's prototype is `LONGEST(*fn)(int)'. */ | |
6151 | ||
6152 | static void | |
6153 | emit_int_call_1 (CORE_ADDR fn, int arg1) | |
6154 | { | |
6155 | target_emit_ops ()->emit_int_call_1 (fn, arg1); | |
6156 | } | |
6157 | ||
4e29fb54 | 6158 | /* FN's prototype is `void(*fn)(int,LONGEST)'. */ |
6a271cae PA |
6159 | |
6160 | static void | |
6161 | emit_void_call_2 (CORE_ADDR fn, int arg1) | |
6162 | { | |
6163 | target_emit_ops ()->emit_void_call_2 (fn, arg1); | |
6164 | } | |
6165 | ||
6b9801d4 SS |
6166 | static void |
6167 | emit_eq_goto (int *offset_p, int *size_p) | |
6168 | { | |
6169 | target_emit_ops ()->emit_eq_goto (offset_p, size_p); | |
6170 | } | |
6171 | ||
6172 | static void | |
6173 | emit_ne_goto (int *offset_p, int *size_p) | |
6174 | { | |
6175 | target_emit_ops ()->emit_ne_goto (offset_p, size_p); | |
6176 | } | |
6177 | ||
6178 | static void | |
6179 | emit_lt_goto (int *offset_p, int *size_p) | |
6180 | { | |
6181 | target_emit_ops ()->emit_lt_goto (offset_p, size_p); | |
6182 | } | |
6183 | ||
6184 | static void | |
6185 | emit_ge_goto (int *offset_p, int *size_p) | |
6186 | { | |
6187 | target_emit_ops ()->emit_ge_goto (offset_p, size_p); | |
6188 | } | |
6189 | ||
6190 | static void | |
6191 | emit_gt_goto (int *offset_p, int *size_p) | |
6192 | { | |
6193 | target_emit_ops ()->emit_gt_goto (offset_p, size_p); | |
6194 | } | |
6195 | ||
6196 | static void | |
6197 | emit_le_goto (int *offset_p, int *size_p) | |
6198 | { | |
6199 | target_emit_ops ()->emit_le_goto (offset_p, size_p); | |
6200 | } | |
6201 | ||
6a271cae PA |
6202 | static enum eval_result_type compile_bytecodes (struct agent_expr *aexpr); |
6203 | ||
6204 | static void | |
493e2a69 MS |
6205 | compile_tracepoint_condition (struct tracepoint *tpoint, |
6206 | CORE_ADDR *jump_entry) | |
6a271cae PA |
6207 | { |
6208 | CORE_ADDR entry_point = *jump_entry; | |
6209 | enum eval_result_type err; | |
6210 | ||
6211 | trace_debug ("Starting condition compilation for tracepoint %d\n", | |
6212 | tpoint->number); | |
6213 | ||
6214 | /* Initialize the global pointer to the code being built. */ | |
6215 | current_insn_ptr = *jump_entry; | |
6216 | ||
6217 | emit_prologue (); | |
6218 | ||
6219 | err = compile_bytecodes (tpoint->cond); | |
6220 | ||
6221 | if (err == expr_eval_no_error) | |
6222 | { | |
6223 | emit_epilogue (); | |
6224 | ||
6225 | /* Record the beginning of the compiled code. */ | |
6226 | tpoint->compiled_cond = entry_point; | |
6227 | ||
6228 | trace_debug ("Condition compilation for tracepoint %d complete\n", | |
6229 | tpoint->number); | |
6230 | } | |
6231 | else | |
6232 | { | |
6233 | /* Leave the unfinished code in situ, but don't point to it. */ | |
6234 | ||
6235 | tpoint->compiled_cond = 0; | |
6236 | ||
6237 | trace_debug ("Condition compilation for tracepoint %d failed, " | |
6238 | "error code %d", | |
6239 | tpoint->number, err); | |
6240 | } | |
6241 | ||
6242 | /* Update the code pointer passed in. Note that we do this even if | |
6243 | the compile fails, so that we can look at the partial results | |
6244 | instead of letting them be overwritten. */ | |
6245 | *jump_entry = current_insn_ptr; | |
6246 | ||
6247 | /* Leave a gap, to aid dump decipherment. */ | |
6248 | *jump_entry += 16; | |
6249 | } | |
6250 | ||
6b9801d4 SS |
6251 | /* Scan an agent expression for any evidence that the given PC is the |
6252 | target of a jump bytecode in the expression. */ | |
6253 | ||
6254 | int | |
6255 | is_goto_target (struct agent_expr *aexpr, int pc) | |
6256 | { | |
6257 | int i; | |
6258 | unsigned char op; | |
6259 | ||
6260 | for (i = 0; i < aexpr->length; i += 1 + gdb_agent_op_sizes[op]) | |
6261 | { | |
6262 | op = aexpr->bytes[i]; | |
6263 | ||
6264 | if (op == gdb_agent_op_goto || op == gdb_agent_op_if_goto) | |
6265 | { | |
6266 | int target = (aexpr->bytes[i + 1] << 8) + aexpr->bytes[i + 2]; | |
6267 | if (target == pc) | |
6268 | return 1; | |
6269 | } | |
6270 | } | |
6271 | ||
6272 | return 0; | |
6273 | } | |
6274 | ||
6a271cae PA |
6275 | /* Given an agent expression, turn it into native code. */ |
6276 | ||
6277 | static enum eval_result_type | |
6278 | compile_bytecodes (struct agent_expr *aexpr) | |
6279 | { | |
6280 | int pc = 0; | |
6281 | int done = 0; | |
6b9801d4 | 6282 | unsigned char op, next_op; |
6a271cae PA |
6283 | int arg; |
6284 | /* This is only used to build 64-bit value for constants. */ | |
6285 | ULONGEST top; | |
6286 | struct bytecode_address *aentry, *aentry2; | |
6287 | ||
6288 | #define UNHANDLED \ | |
6289 | do \ | |
6290 | { \ | |
6291 | trace_debug ("Cannot compile op 0x%x\n", op); \ | |
6292 | return expr_eval_unhandled_opcode; \ | |
6293 | } while (0) | |
6294 | ||
6295 | if (aexpr->length == 0) | |
6296 | { | |
6297 | trace_debug ("empty agent expression\n"); | |
6298 | return expr_eval_empty_expression; | |
6299 | } | |
6300 | ||
6301 | bytecode_address_table = NULL; | |
6302 | ||
6303 | while (!done) | |
6304 | { | |
6305 | op = aexpr->bytes[pc]; | |
6306 | ||
6307 | trace_debug ("About to compile op 0x%x, pc=%d\n", op, pc); | |
6308 | ||
6309 | /* Record the compiled-code address of the bytecode, for use by | |
6310 | jump instructions. */ | |
6311 | aentry = xmalloc (sizeof (struct bytecode_address)); | |
6312 | aentry->pc = pc; | |
6313 | aentry->address = current_insn_ptr; | |
6314 | aentry->goto_pc = -1; | |
6315 | aentry->from_offset = aentry->from_size = 0; | |
6316 | aentry->next = bytecode_address_table; | |
6317 | bytecode_address_table = aentry; | |
6318 | ||
6319 | ++pc; | |
6320 | ||
6321 | emit_error = 0; | |
6322 | ||
6323 | switch (op) | |
6324 | { | |
6325 | case gdb_agent_op_add: | |
6326 | emit_add (); | |
6327 | break; | |
6328 | ||
6329 | case gdb_agent_op_sub: | |
6330 | emit_sub (); | |
6331 | break; | |
6332 | ||
6333 | case gdb_agent_op_mul: | |
6334 | emit_mul (); | |
6335 | break; | |
6336 | ||
6337 | case gdb_agent_op_div_signed: | |
6338 | UNHANDLED; | |
6339 | break; | |
6340 | ||
6341 | case gdb_agent_op_div_unsigned: | |
6342 | UNHANDLED; | |
6343 | break; | |
6344 | ||
6345 | case gdb_agent_op_rem_signed: | |
6346 | UNHANDLED; | |
6347 | break; | |
6348 | ||
6349 | case gdb_agent_op_rem_unsigned: | |
6350 | UNHANDLED; | |
6351 | break; | |
6352 | ||
6353 | case gdb_agent_op_lsh: | |
6354 | emit_lsh (); | |
6355 | break; | |
6356 | ||
6357 | case gdb_agent_op_rsh_signed: | |
6358 | emit_rsh_signed (); | |
6359 | break; | |
6360 | ||
6361 | case gdb_agent_op_rsh_unsigned: | |
6362 | emit_rsh_unsigned (); | |
6363 | break; | |
6364 | ||
6365 | case gdb_agent_op_trace: | |
6366 | UNHANDLED; | |
6367 | break; | |
6368 | ||
6369 | case gdb_agent_op_trace_quick: | |
6370 | UNHANDLED; | |
6371 | break; | |
6372 | ||
6373 | case gdb_agent_op_log_not: | |
6374 | emit_log_not (); | |
6375 | break; | |
6376 | ||
6377 | case gdb_agent_op_bit_and: | |
6378 | emit_bit_and (); | |
6379 | break; | |
6380 | ||
6381 | case gdb_agent_op_bit_or: | |
6382 | emit_bit_or (); | |
6383 | break; | |
6384 | ||
6385 | case gdb_agent_op_bit_xor: | |
6386 | emit_bit_xor (); | |
6387 | break; | |
6388 | ||
6389 | case gdb_agent_op_bit_not: | |
6390 | emit_bit_not (); | |
6391 | break; | |
6392 | ||
6393 | case gdb_agent_op_equal: | |
6b9801d4 SS |
6394 | next_op = aexpr->bytes[pc]; |
6395 | if (next_op == gdb_agent_op_if_goto | |
6396 | && !is_goto_target (aexpr, pc) | |
6397 | && target_emit_ops ()->emit_eq_goto) | |
6398 | { | |
6399 | trace_debug ("Combining equal & if_goto"); | |
6400 | pc += 1; | |
6401 | aentry->pc = pc; | |
6402 | arg = aexpr->bytes[pc++]; | |
6403 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
6404 | aentry->goto_pc = arg; | |
6405 | emit_eq_goto (&(aentry->from_offset), &(aentry->from_size)); | |
6406 | } | |
6407 | else if (next_op == gdb_agent_op_log_not | |
6408 | && (aexpr->bytes[pc + 1] == gdb_agent_op_if_goto) | |
6409 | && !is_goto_target (aexpr, pc + 1) | |
6410 | && target_emit_ops ()->emit_ne_goto) | |
6411 | { | |
6412 | trace_debug ("Combining equal & log_not & if_goto"); | |
6413 | pc += 2; | |
6414 | aentry->pc = pc; | |
6415 | arg = aexpr->bytes[pc++]; | |
6416 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
6417 | aentry->goto_pc = arg; | |
6418 | emit_ne_goto (&(aentry->from_offset), &(aentry->from_size)); | |
6419 | } | |
6420 | else | |
6421 | emit_equal (); | |
6a271cae PA |
6422 | break; |
6423 | ||
6424 | case gdb_agent_op_less_signed: | |
6b9801d4 SS |
6425 | next_op = aexpr->bytes[pc]; |
6426 | if (next_op == gdb_agent_op_if_goto | |
6427 | && !is_goto_target (aexpr, pc)) | |
6428 | { | |
6429 | trace_debug ("Combining less_signed & if_goto"); | |
6430 | pc += 1; | |
6431 | aentry->pc = pc; | |
6432 | arg = aexpr->bytes[pc++]; | |
6433 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
6434 | aentry->goto_pc = arg; | |
6435 | emit_lt_goto (&(aentry->from_offset), &(aentry->from_size)); | |
6436 | } | |
6437 | else if (next_op == gdb_agent_op_log_not | |
6438 | && !is_goto_target (aexpr, pc) | |
6439 | && (aexpr->bytes[pc + 1] == gdb_agent_op_if_goto) | |
6440 | && !is_goto_target (aexpr, pc + 1)) | |
6441 | { | |
6442 | trace_debug ("Combining less_signed & log_not & if_goto"); | |
6443 | pc += 2; | |
6444 | aentry->pc = pc; | |
6445 | arg = aexpr->bytes[pc++]; | |
6446 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
6447 | aentry->goto_pc = arg; | |
6448 | emit_ge_goto (&(aentry->from_offset), &(aentry->from_size)); | |
6449 | } | |
6450 | else | |
6451 | emit_less_signed (); | |
6a271cae PA |
6452 | break; |
6453 | ||
6454 | case gdb_agent_op_less_unsigned: | |
6455 | emit_less_unsigned (); | |
6456 | break; | |
6457 | ||
6458 | case gdb_agent_op_ext: | |
6459 | arg = aexpr->bytes[pc++]; | |
6460 | if (arg < (sizeof (LONGEST) * 8)) | |
6461 | emit_ext (arg); | |
6462 | break; | |
6463 | ||
6464 | case gdb_agent_op_ref8: | |
6465 | emit_ref (1); | |
6466 | break; | |
6467 | ||
6468 | case gdb_agent_op_ref16: | |
6469 | emit_ref (2); | |
6470 | break; | |
6471 | ||
6472 | case gdb_agent_op_ref32: | |
6473 | emit_ref (4); | |
6474 | break; | |
6475 | ||
6476 | case gdb_agent_op_ref64: | |
6477 | emit_ref (8); | |
6478 | break; | |
6479 | ||
6480 | case gdb_agent_op_if_goto: | |
6481 | arg = aexpr->bytes[pc++]; | |
6482 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
6483 | aentry->goto_pc = arg; | |
6484 | emit_if_goto (&(aentry->from_offset), &(aentry->from_size)); | |
6485 | break; | |
6486 | ||
6487 | case gdb_agent_op_goto: | |
6488 | arg = aexpr->bytes[pc++]; | |
6489 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
6490 | aentry->goto_pc = arg; | |
6491 | emit_goto (&(aentry->from_offset), &(aentry->from_size)); | |
6492 | break; | |
6493 | ||
6494 | case gdb_agent_op_const8: | |
6495 | emit_stack_flush (); | |
6496 | top = aexpr->bytes[pc++]; | |
6497 | emit_const (top); | |
6498 | break; | |
6499 | ||
6500 | case gdb_agent_op_const16: | |
6501 | emit_stack_flush (); | |
6502 | top = aexpr->bytes[pc++]; | |
6503 | top = (top << 8) + aexpr->bytes[pc++]; | |
6504 | emit_const (top); | |
6505 | break; | |
6506 | ||
6507 | case gdb_agent_op_const32: | |
6508 | emit_stack_flush (); | |
6509 | top = aexpr->bytes[pc++]; | |
6510 | top = (top << 8) + aexpr->bytes[pc++]; | |
6511 | top = (top << 8) + aexpr->bytes[pc++]; | |
6512 | top = (top << 8) + aexpr->bytes[pc++]; | |
6513 | emit_const (top); | |
6514 | break; | |
6515 | ||
6516 | case gdb_agent_op_const64: | |
6517 | emit_stack_flush (); | |
6518 | top = aexpr->bytes[pc++]; | |
6519 | top = (top << 8) + aexpr->bytes[pc++]; | |
6520 | top = (top << 8) + aexpr->bytes[pc++]; | |
6521 | top = (top << 8) + aexpr->bytes[pc++]; | |
6522 | top = (top << 8) + aexpr->bytes[pc++]; | |
6523 | top = (top << 8) + aexpr->bytes[pc++]; | |
6524 | top = (top << 8) + aexpr->bytes[pc++]; | |
6525 | top = (top << 8) + aexpr->bytes[pc++]; | |
6526 | emit_const (top); | |
6527 | break; | |
6528 | ||
6529 | case gdb_agent_op_reg: | |
6530 | emit_stack_flush (); | |
6531 | arg = aexpr->bytes[pc++]; | |
6532 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
6533 | emit_reg (arg); | |
6534 | break; | |
6535 | ||
6536 | case gdb_agent_op_end: | |
6537 | trace_debug ("At end of expression\n"); | |
6538 | ||
6539 | /* Assume there is one stack element left, and that it is | |
6540 | cached in "top" where emit_epilogue can get to it. */ | |
6541 | emit_stack_adjust (1); | |
6542 | ||
6543 | done = 1; | |
6544 | break; | |
6545 | ||
6546 | case gdb_agent_op_dup: | |
6547 | /* In our design, dup is equivalent to stack flushing. */ | |
6548 | emit_stack_flush (); | |
6549 | break; | |
6550 | ||
6551 | case gdb_agent_op_pop: | |
6552 | emit_pop (); | |
6553 | break; | |
6554 | ||
6555 | case gdb_agent_op_zero_ext: | |
6556 | arg = aexpr->bytes[pc++]; | |
6557 | if (arg < (sizeof (LONGEST) * 8)) | |
6558 | emit_zero_ext (arg); | |
6559 | break; | |
6560 | ||
6561 | case gdb_agent_op_swap: | |
6b9801d4 SS |
6562 | next_op = aexpr->bytes[pc]; |
6563 | /* Detect greater-than comparison sequences. */ | |
6564 | if (next_op == gdb_agent_op_less_signed | |
6565 | && !is_goto_target (aexpr, pc) | |
6566 | && (aexpr->bytes[pc + 1] == gdb_agent_op_if_goto) | |
6567 | && !is_goto_target (aexpr, pc + 1)) | |
6568 | { | |
6569 | trace_debug ("Combining swap & less_signed & if_goto"); | |
6570 | pc += 2; | |
6571 | aentry->pc = pc; | |
6572 | arg = aexpr->bytes[pc++]; | |
6573 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
6574 | aentry->goto_pc = arg; | |
6575 | emit_gt_goto (&(aentry->from_offset), &(aentry->from_size)); | |
6576 | } | |
6577 | else if (next_op == gdb_agent_op_less_signed | |
6578 | && !is_goto_target (aexpr, pc) | |
6579 | && (aexpr->bytes[pc + 1] == gdb_agent_op_log_not) | |
6580 | && !is_goto_target (aexpr, pc + 1) | |
6581 | && (aexpr->bytes[pc + 2] == gdb_agent_op_if_goto) | |
6582 | && !is_goto_target (aexpr, pc + 2)) | |
6583 | { | |
6584 | trace_debug ("Combining swap & less_signed & log_not & if_goto"); | |
6585 | pc += 3; | |
6586 | aentry->pc = pc; | |
6587 | arg = aexpr->bytes[pc++]; | |
6588 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
6589 | aentry->goto_pc = arg; | |
6590 | emit_le_goto (&(aentry->from_offset), &(aentry->from_size)); | |
6591 | } | |
6592 | else | |
6593 | emit_swap (); | |
6a271cae PA |
6594 | break; |
6595 | ||
6596 | case gdb_agent_op_getv: | |
6597 | emit_stack_flush (); | |
6598 | arg = aexpr->bytes[pc++]; | |
6599 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
6600 | emit_int_call_1 (ipa_sym_addrs.addr_get_trace_state_variable_value, | |
6601 | arg); | |
6602 | break; | |
6603 | ||
6604 | case gdb_agent_op_setv: | |
6605 | arg = aexpr->bytes[pc++]; | |
6606 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
6607 | emit_void_call_2 (ipa_sym_addrs.addr_set_trace_state_variable_value, | |
6608 | arg); | |
6609 | break; | |
6610 | ||
6611 | case gdb_agent_op_tracev: | |
6612 | UNHANDLED; | |
6613 | break; | |
6614 | ||
6615 | /* GDB never (currently) generates any of these ops. */ | |
6616 | case gdb_agent_op_float: | |
6617 | case gdb_agent_op_ref_float: | |
6618 | case gdb_agent_op_ref_double: | |
6619 | case gdb_agent_op_ref_long_double: | |
6620 | case gdb_agent_op_l_to_d: | |
6621 | case gdb_agent_op_d_to_l: | |
6622 | case gdb_agent_op_trace16: | |
6623 | UNHANDLED; | |
6624 | break; | |
6625 | ||
6626 | default: | |
6627 | trace_debug ("Agent expression op 0x%x not recognized\n", op); | |
6628 | /* Don't struggle on, things will just get worse. */ | |
6629 | return expr_eval_unrecognized_opcode; | |
6630 | } | |
6631 | ||
6632 | /* This catches errors that occur in target-specific code | |
6633 | emission. */ | |
6634 | if (emit_error) | |
6635 | { | |
6636 | trace_debug ("Error %d while emitting code for %s\n", | |
94d5e490 | 6637 | emit_error, gdb_agent_op_name (op)); |
6a271cae PA |
6638 | return expr_eval_unhandled_opcode; |
6639 | } | |
6640 | ||
94d5e490 | 6641 | trace_debug ("Op %s compiled\n", gdb_agent_op_name (op)); |
6a271cae PA |
6642 | } |
6643 | ||
6644 | /* Now fill in real addresses as goto destinations. */ | |
6645 | for (aentry = bytecode_address_table; aentry; aentry = aentry->next) | |
6646 | { | |
6647 | int written = 0; | |
6648 | ||
6649 | if (aentry->goto_pc < 0) | |
6650 | continue; | |
6651 | ||
6652 | /* Find the location that we are going to, and call back into | |
6653 | target-specific code to write the actual address or | |
6654 | displacement. */ | |
6655 | for (aentry2 = bytecode_address_table; aentry2; aentry2 = aentry2->next) | |
6656 | { | |
6657 | if (aentry2->pc == aentry->goto_pc) | |
6658 | { | |
6659 | trace_debug ("Want to jump from %s to %s\n", | |
6660 | paddress (aentry->address), | |
6661 | paddress (aentry2->address)); | |
6662 | write_goto_address (aentry->address + aentry->from_offset, | |
6663 | aentry2->address, aentry->from_size); | |
6664 | written = 1; | |
6665 | break; | |
6666 | } | |
6667 | } | |
6668 | ||
6669 | /* Error out if we didn't find a destination. */ | |
6670 | if (!written) | |
6671 | { | |
6672 | trace_debug ("Destination of goto %d not found\n", | |
6673 | aentry->goto_pc); | |
6674 | return expr_eval_invalid_goto; | |
6675 | } | |
6676 | } | |
6677 | ||
6678 | return expr_eval_no_error; | |
6679 | } | |
6680 | ||
fa593d66 PA |
6681 | /* We'll need to adjust these when we consider bi-arch setups, and big |
6682 | endian machines. */ | |
6683 | ||
6684 | static int | |
6685 | write_inferior_data_ptr (CORE_ADDR where, CORE_ADDR ptr) | |
6686 | { | |
6687 | return write_inferior_memory (where, | |
6688 | (unsigned char *) &ptr, sizeof (void *)); | |
6689 | } | |
6690 | ||
6691 | /* The base pointer of the IPA's heap. This is the only memory the | |
6692 | IPA is allowed to use. The IPA should _not_ call the inferior's | |
6693 | `malloc' during operation. That'd be slow, and, most importantly, | |
6694 | it may not be safe. We may be collecting a tracepoint in a signal | |
6695 | handler, for example. */ | |
6696 | static CORE_ADDR target_tp_heap; | |
6697 | ||
6698 | /* Allocate at least SIZE bytes of memory from the IPA heap, aligned | |
6699 | to 8 bytes. */ | |
6700 | ||
6701 | static CORE_ADDR | |
6702 | target_malloc (ULONGEST size) | |
6703 | { | |
6704 | CORE_ADDR ptr; | |
6705 | ||
6706 | if (target_tp_heap == 0) | |
6707 | { | |
6708 | /* We have the pointer *address*, need what it points to. */ | |
6709 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_tp_heap_buffer, | |
6710 | &target_tp_heap)) | |
6711 | fatal ("could get target heap head pointer"); | |
6712 | } | |
6713 | ||
6714 | ptr = target_tp_heap; | |
6715 | target_tp_heap += size; | |
6716 | ||
6717 | /* Pad to 8-byte alignment. */ | |
6718 | target_tp_heap = ((target_tp_heap + 7) & ~0x7); | |
6719 | ||
6720 | return ptr; | |
6721 | } | |
6722 | ||
6723 | static CORE_ADDR | |
6724 | download_agent_expr (struct agent_expr *expr) | |
6725 | { | |
6726 | CORE_ADDR expr_addr; | |
6727 | CORE_ADDR expr_bytes; | |
6728 | ||
6729 | expr_addr = target_malloc (sizeof (*expr)); | |
6730 | write_inferior_memory (expr_addr, (unsigned char *) expr, sizeof (*expr)); | |
6731 | ||
6732 | expr_bytes = target_malloc (expr->length); | |
6733 | write_inferior_data_ptr (expr_addr + offsetof (struct agent_expr, bytes), | |
6734 | expr_bytes); | |
6735 | write_inferior_memory (expr_bytes, expr->bytes, expr->length); | |
6736 | ||
6737 | return expr_addr; | |
6738 | } | |
6739 | ||
6740 | /* Align V up to N bits. */ | |
6741 | #define UALIGN(V, N) (((V) + ((N) - 1)) & ~((N) - 1)) | |
6742 | ||
5c73ff4e YQ |
6743 | /* Sync tracepoint with IPA, but leave maintenance of linked list to caller. */ |
6744 | ||
fa593d66 | 6745 | static void |
5c73ff4e | 6746 | download_tracepoint_1 (struct tracepoint *tpoint) |
fa593d66 | 6747 | { |
5c73ff4e YQ |
6748 | struct tracepoint target_tracepoint; |
6749 | CORE_ADDR tpptr = 0; | |
fa593d66 | 6750 | |
5c73ff4e YQ |
6751 | gdb_assert (tpoint->type == fast_tracepoint |
6752 | || tpoint->type == static_tracepoint); | |
fa593d66 | 6753 | |
5c73ff4e | 6754 | if (tpoint->cond != NULL && target_emit_ops () != NULL) |
fa593d66 | 6755 | { |
5c73ff4e | 6756 | CORE_ADDR jentry, jump_entry; |
fa593d66 | 6757 | |
5c73ff4e | 6758 | jentry = jump_entry = get_jump_space_head (); |
fa593d66 | 6759 | |
5c73ff4e | 6760 | if (tpoint->cond != NULL) |
6a271cae | 6761 | { |
5c73ff4e YQ |
6762 | /* Pad to 8-byte alignment. (needed?) */ |
6763 | /* Actually this should be left for the target to | |
6764 | decide. */ | |
6765 | jentry = UALIGN (jentry, 8); | |
6766 | ||
6767 | compile_tracepoint_condition (tpoint, &jentry); | |
6768 | } | |
6769 | ||
6770 | /* Pad to 8-byte alignment. */ | |
6771 | jentry = UALIGN (jentry, 8); | |
6772 | claim_jump_space (jentry - jump_entry); | |
6773 | } | |
6a271cae | 6774 | |
5c73ff4e | 6775 | target_tracepoint = *tpoint; |
6a271cae | 6776 | |
5c73ff4e YQ |
6777 | tpptr = target_malloc (sizeof (*tpoint)); |
6778 | tpoint->obj_addr_on_target = tpptr; | |
6779 | ||
6780 | /* Write the whole object. We'll fix up its pointers in a bit. | |
6781 | Assume no next for now. This is fixed up above on the next | |
6782 | iteration, if there's any. */ | |
6783 | target_tracepoint.next = NULL; | |
6784 | /* Need to clear this here too, since we're downloading the | |
6785 | tracepoints before clearing our own copy. */ | |
6786 | target_tracepoint.hit_count = 0; | |
6787 | ||
6788 | write_inferior_memory (tpptr, (unsigned char *) &target_tracepoint, | |
6789 | sizeof (target_tracepoint)); | |
6790 | ||
6791 | if (tpoint->cond) | |
6792 | write_inferior_data_ptr (tpptr + offsetof (struct tracepoint, | |
6793 | cond), | |
6794 | download_agent_expr (tpoint->cond)); | |
6795 | ||
6796 | if (tpoint->numactions) | |
6797 | { | |
6798 | int i; | |
6799 | CORE_ADDR actions_array; | |
6800 | ||
6801 | /* The pointers array. */ | |
6802 | actions_array | |
6803 | = target_malloc (sizeof (*tpoint->actions) * tpoint->numactions); | |
6804 | write_inferior_data_ptr (tpptr + offsetof (struct tracepoint, | |
6805 | actions), | |
6806 | actions_array); | |
6807 | ||
6808 | /* Now for each pointer, download the action. */ | |
6809 | for (i = 0; i < tpoint->numactions; i++) | |
6810 | { | |
6811 | CORE_ADDR ipa_action = 0; | |
6812 | struct tracepoint_action *action = tpoint->actions[i]; | |
6813 | ||
6814 | switch (action->type) | |
6a271cae | 6815 | { |
5c73ff4e YQ |
6816 | case 'M': |
6817 | ipa_action | |
6818 | = target_malloc (sizeof (struct collect_memory_action)); | |
6819 | write_inferior_memory (ipa_action, | |
6820 | (unsigned char *) action, | |
6821 | sizeof (struct collect_memory_action)); | |
6822 | break; | |
6823 | case 'R': | |
6824 | ipa_action | |
6825 | = target_malloc (sizeof (struct collect_registers_action)); | |
6826 | write_inferior_memory (ipa_action, | |
6827 | (unsigned char *) action, | |
6828 | sizeof (struct collect_registers_action)); | |
6829 | break; | |
6830 | case 'X': | |
6831 | { | |
6832 | CORE_ADDR expr; | |
6833 | struct eval_expr_action *eaction | |
6834 | = (struct eval_expr_action *) action; | |
6a271cae | 6835 | |
5c73ff4e YQ |
6836 | ipa_action = target_malloc (sizeof (*eaction)); |
6837 | write_inferior_memory (ipa_action, | |
6838 | (unsigned char *) eaction, | |
6839 | sizeof (*eaction)); | |
6840 | ||
6841 | expr = download_agent_expr (eaction->expr); | |
6842 | write_inferior_data_ptr | |
6843 | (ipa_action + offsetof (struct eval_expr_action, expr), | |
6844 | expr); | |
6845 | break; | |
6846 | } | |
6847 | case 'L': | |
6848 | ipa_action = target_malloc | |
6849 | (sizeof (struct collect_static_trace_data_action)); | |
6850 | write_inferior_memory | |
6851 | (ipa_action, | |
6852 | (unsigned char *) action, | |
6853 | sizeof (struct collect_static_trace_data_action)); | |
6854 | break; | |
6855 | default: | |
6856 | trace_debug ("unknown trace action '%c', ignoring", | |
6857 | action->type); | |
6858 | break; | |
6a271cae PA |
6859 | } |
6860 | ||
5c73ff4e YQ |
6861 | if (ipa_action != 0) |
6862 | write_inferior_data_ptr | |
6863 | (actions_array + i * sizeof (sizeof (*tpoint->actions)), | |
6864 | ipa_action); | |
6a271cae | 6865 | } |
5c73ff4e YQ |
6866 | } |
6867 | } | |
6a271cae | 6868 | |
1e4d1764 YQ |
6869 | static void |
6870 | download_tracepoint (struct tracepoint *tpoint) | |
6871 | { | |
6872 | struct tracepoint *tp, *tp_prev; | |
6873 | ||
6874 | if (tpoint->type != fast_tracepoint | |
6875 | && tpoint->type != static_tracepoint) | |
6876 | return; | |
6877 | ||
6878 | download_tracepoint_1 (tpoint); | |
6879 | ||
6880 | /* Find the previous entry of TPOINT, which is fast tracepoint or | |
6881 | static tracepoint. */ | |
6882 | tp_prev = NULL; | |
6883 | for (tp = tracepoints; tp != tpoint; tp = tp->next) | |
6884 | { | |
6885 | if (tp->type == fast_tracepoint || tp->type == static_tracepoint) | |
6886 | tp_prev = tp; | |
6887 | } | |
6888 | ||
6889 | if (tp_prev) | |
6890 | { | |
6891 | CORE_ADDR tp_prev_target_next_addr; | |
6892 | ||
6893 | /* Insert TPOINT after TP_PREV in IPA. */ | |
6894 | if (read_inferior_data_pointer (tp_prev->obj_addr_on_target | |
6895 | + offsetof (struct tracepoint, next), | |
6896 | &tp_prev_target_next_addr)) | |
6897 | fatal ("error reading `tp_prev->next'"); | |
6898 | ||
6899 | /* tpoint->next = tp_prev->next */ | |
6900 | write_inferior_data_ptr (tpoint->obj_addr_on_target | |
6901 | + offsetof (struct tracepoint, next), | |
6902 | tp_prev_target_next_addr); | |
6903 | /* tp_prev->next = tpoint */ | |
6904 | write_inferior_data_ptr (tp_prev->obj_addr_on_target | |
6905 | + offsetof (struct tracepoint, next), | |
6906 | tpoint->obj_addr_on_target); | |
6907 | } | |
6908 | else | |
6909 | /* First object in list, set the head pointer in the | |
6910 | inferior. */ | |
6911 | write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints, | |
6912 | tpoint->obj_addr_on_target); | |
6913 | ||
6914 | } | |
6915 | ||
5c73ff4e YQ |
6916 | static void |
6917 | download_tracepoints (void) | |
6918 | { | |
6919 | CORE_ADDR tpptr = 0, prev_tpptr = 0; | |
6920 | struct tracepoint *tpoint; | |
6921 | ||
6922 | /* Start out empty. */ | |
6923 | write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints, 0); | |
6924 | ||
6925 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
6926 | { | |
6927 | if (tpoint->type != fast_tracepoint | |
6928 | && tpoint->type != static_tracepoint) | |
6929 | continue; | |
fa593d66 PA |
6930 | |
6931 | prev_tpptr = tpptr; | |
5c73ff4e YQ |
6932 | |
6933 | download_tracepoint_1 (tpoint); | |
6934 | ||
6935 | tpptr = tpoint->obj_addr_on_target; | |
fa593d66 PA |
6936 | |
6937 | if (tpoint == tracepoints) | |
6938 | { | |
6939 | /* First object in list, set the head pointer in the | |
6940 | inferior. */ | |
6941 | write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints, tpptr); | |
6942 | } | |
6943 | else | |
6944 | { | |
6945 | write_inferior_data_ptr (prev_tpptr + offsetof (struct tracepoint, | |
6946 | next), | |
6947 | tpptr); | |
6948 | } | |
fa593d66 PA |
6949 | } |
6950 | } | |
6951 | ||
6952 | static void | |
6953 | download_trace_state_variables (void) | |
6954 | { | |
6955 | CORE_ADDR ptr = 0, prev_ptr = 0; | |
6956 | struct trace_state_variable *tsv; | |
6957 | ||
6958 | /* Start out empty. */ | |
6959 | write_inferior_data_ptr (ipa_sym_addrs.addr_trace_state_variables, 0); | |
6960 | ||
6961 | for (tsv = trace_state_variables; tsv != NULL; tsv = tsv->next) | |
6962 | { | |
6963 | struct trace_state_variable target_tsv; | |
6964 | ||
6965 | /* TSV's with a getter have been initialized equally in both the | |
6966 | inferior and GDBserver. Skip them. */ | |
6967 | if (tsv->getter != NULL) | |
6968 | continue; | |
6969 | ||
6970 | target_tsv = *tsv; | |
6971 | ||
6972 | prev_ptr = ptr; | |
6973 | ptr = target_malloc (sizeof (*tsv)); | |
6974 | ||
6975 | if (tsv == trace_state_variables) | |
6976 | { | |
6977 | /* First object in list, set the head pointer in the | |
6978 | inferior. */ | |
6979 | ||
6980 | write_inferior_data_ptr (ipa_sym_addrs.addr_trace_state_variables, | |
6981 | ptr); | |
6982 | } | |
6983 | else | |
6984 | { | |
6985 | write_inferior_data_ptr (prev_ptr | |
6986 | + offsetof (struct trace_state_variable, | |
6987 | next), | |
6988 | ptr); | |
6989 | } | |
6990 | ||
6991 | /* Write the whole object. We'll fix up its pointers in a bit. | |
6992 | Assume no next, fixup when needed. */ | |
6993 | target_tsv.next = NULL; | |
6994 | ||
6995 | write_inferior_memory (ptr, (unsigned char *) &target_tsv, | |
6996 | sizeof (target_tsv)); | |
6997 | ||
6998 | if (tsv->name != NULL) | |
6999 | { | |
7000 | size_t size = strlen (tsv->name) + 1; | |
7001 | CORE_ADDR name_addr = target_malloc (size); | |
7002 | write_inferior_memory (name_addr, | |
7003 | (unsigned char *) tsv->name, size); | |
7004 | write_inferior_data_ptr (ptr | |
7005 | + offsetof (struct trace_state_variable, | |
7006 | name), | |
7007 | name_addr); | |
7008 | } | |
7009 | ||
7010 | if (tsv->getter != NULL) | |
7011 | { | |
7012 | fatal ("what to do with these?"); | |
7013 | } | |
7014 | } | |
7015 | ||
7016 | if (prev_ptr != 0) | |
7017 | { | |
7018 | /* Fixup the next pointer in the last item in the list. */ | |
493e2a69 MS |
7019 | write_inferior_data_ptr (prev_ptr |
7020 | + offsetof (struct trace_state_variable, | |
7021 | next), 0); | |
fa593d66 PA |
7022 | } |
7023 | } | |
7024 | ||
7025 | /* Upload complete trace frames out of the IP Agent's trace buffer | |
7026 | into GDBserver's trace buffer. This always uploads either all or | |
7027 | no trace frames. This is the counter part of | |
7028 | `trace_alloc_trace_buffer'. See its description of the atomic | |
7029 | synching mechanism. */ | |
7030 | ||
7031 | static void | |
7032 | upload_fast_traceframes (void) | |
7033 | { | |
7034 | unsigned int ipa_traceframe_read_count, ipa_traceframe_write_count; | |
7035 | unsigned int ipa_traceframe_read_count_racy, ipa_traceframe_write_count_racy; | |
7036 | CORE_ADDR tf; | |
7037 | struct ipa_trace_buffer_control ipa_trace_buffer_ctrl; | |
7038 | unsigned int curr_tbctrl_idx; | |
7039 | unsigned int ipa_trace_buffer_ctrl_curr; | |
7040 | unsigned int ipa_trace_buffer_ctrl_curr_old; | |
7041 | CORE_ADDR ipa_trace_buffer_ctrl_addr; | |
7042 | struct breakpoint *about_to_request_buffer_space_bkpt; | |
7043 | CORE_ADDR ipa_trace_buffer_lo; | |
7044 | CORE_ADDR ipa_trace_buffer_hi; | |
7045 | ||
7046 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, | |
7047 | &ipa_traceframe_read_count_racy)) | |
7048 | { | |
7049 | /* This will happen in most targets if the current thread is | |
7050 | running. */ | |
7051 | return; | |
7052 | } | |
7053 | ||
7054 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, | |
7055 | &ipa_traceframe_write_count_racy)) | |
7056 | return; | |
7057 | ||
7058 | trace_debug ("ipa_traceframe_count (racy area): %d (w=%d, r=%d)", | |
493e2a69 MS |
7059 | ipa_traceframe_write_count_racy |
7060 | - ipa_traceframe_read_count_racy, | |
7061 | ipa_traceframe_write_count_racy, | |
7062 | ipa_traceframe_read_count_racy); | |
fa593d66 PA |
7063 | |
7064 | if (ipa_traceframe_write_count_racy == ipa_traceframe_read_count_racy) | |
7065 | return; | |
7066 | ||
7067 | about_to_request_buffer_space_bkpt | |
7068 | = set_breakpoint_at (ipa_sym_addrs.addr_about_to_request_buffer_space, | |
7069 | NULL); | |
7070 | ||
7071 | if (read_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, | |
7072 | &ipa_trace_buffer_ctrl_curr)) | |
7073 | return; | |
7074 | ||
7075 | ipa_trace_buffer_ctrl_curr_old = ipa_trace_buffer_ctrl_curr; | |
7076 | ||
7077 | curr_tbctrl_idx = ipa_trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK; | |
7078 | ||
7079 | { | |
7080 | unsigned int prev, counter; | |
7081 | ||
7082 | /* Update the token, with new counters, and the GDBserver stamp | |
7083 | bit. Alway reuse the current TBC index. */ | |
2ece8244 YQ |
7084 | prev = ipa_trace_buffer_ctrl_curr & GDBSERVER_FLUSH_COUNT_MASK_CURR; |
7085 | counter = (prev + 0x100) & GDBSERVER_FLUSH_COUNT_MASK_CURR; | |
fa593d66 | 7086 | |
2ece8244 | 7087 | ipa_trace_buffer_ctrl_curr = (GDBSERVER_UPDATED_FLUSH_COUNT_BIT |
fa593d66 PA |
7088 | | (prev << 12) |
7089 | | counter | |
7090 | | curr_tbctrl_idx); | |
7091 | } | |
7092 | ||
7093 | if (write_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, | |
7094 | ipa_trace_buffer_ctrl_curr)) | |
7095 | return; | |
7096 | ||
7097 | trace_debug ("Lib: Committed %08x -> %08x", | |
7098 | ipa_trace_buffer_ctrl_curr_old, | |
7099 | ipa_trace_buffer_ctrl_curr); | |
7100 | ||
7101 | /* Re-read these, now that we've installed the | |
7102 | `about_to_request_buffer_space' breakpoint/lock. A thread could | |
7103 | have finished a traceframe between the last read of these | |
7104 | counters and setting the breakpoint above. If we start | |
7105 | uploading, we never want to leave this function with | |
7106 | traceframe_read_count != 0, otherwise, GDBserver could end up | |
7107 | incrementing the counter tokens more than once (due to event loop | |
7108 | nesting), which would break the IP agent's "effective" detection | |
7109 | (see trace_alloc_trace_buffer). */ | |
7110 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, | |
7111 | &ipa_traceframe_read_count)) | |
7112 | return; | |
7113 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, | |
7114 | &ipa_traceframe_write_count)) | |
7115 | return; | |
7116 | ||
7117 | if (debug_threads) | |
7118 | { | |
7119 | trace_debug ("ipa_traceframe_count (blocked area): %d (w=%d, r=%d)", | |
7120 | ipa_traceframe_write_count - ipa_traceframe_read_count, | |
7121 | ipa_traceframe_write_count, ipa_traceframe_read_count); | |
7122 | ||
7123 | if (ipa_traceframe_write_count != ipa_traceframe_write_count_racy | |
7124 | || ipa_traceframe_read_count != ipa_traceframe_read_count_racy) | |
7125 | trace_debug ("note that ipa_traceframe_count's parts changed"); | |
7126 | } | |
7127 | ||
7128 | /* Get the address of the current TBC object (the IP agent has an | |
7129 | array of 3 such objects). The index is stored in the TBC | |
7130 | token. */ | |
7131 | ipa_trace_buffer_ctrl_addr = ipa_sym_addrs.addr_trace_buffer_ctrl; | |
7132 | ipa_trace_buffer_ctrl_addr | |
7133 | += sizeof (struct ipa_trace_buffer_control) * curr_tbctrl_idx; | |
7134 | ||
7135 | if (read_inferior_memory (ipa_trace_buffer_ctrl_addr, | |
7136 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
7137 | sizeof (struct ipa_trace_buffer_control))) | |
7138 | return; | |
7139 | ||
7140 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_lo, | |
7141 | &ipa_trace_buffer_lo)) | |
7142 | return; | |
7143 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_hi, | |
7144 | &ipa_trace_buffer_hi)) | |
7145 | return; | |
7146 | ||
7147 | /* Offsets are easier to grok for debugging than raw addresses, | |
7148 | especially for the small trace buffer sizes that are useful for | |
7149 | testing. */ | |
7150 | trace_debug ("Lib: Trace buffer [%d] start=%d free=%d " | |
7151 | "endfree=%d wrap=%d hi=%d", | |
7152 | curr_tbctrl_idx, | |
7153 | (int) (ipa_trace_buffer_ctrl.start - ipa_trace_buffer_lo), | |
7154 | (int) (ipa_trace_buffer_ctrl.free - ipa_trace_buffer_lo), | |
7155 | (int) (ipa_trace_buffer_ctrl.end_free - ipa_trace_buffer_lo), | |
7156 | (int) (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo), | |
7157 | (int) (ipa_trace_buffer_hi - ipa_trace_buffer_lo)); | |
7158 | ||
7159 | /* Note that the IPA's buffer is always circular. */ | |
7160 | ||
7161 | #define IPA_FIRST_TRACEFRAME() (ipa_trace_buffer_ctrl.start) | |
7162 | ||
7163 | #define IPA_NEXT_TRACEFRAME_1(TF, TFOBJ) \ | |
7164 | ((TF) + sizeof (struct traceframe) + (TFOBJ)->data_size) | |
7165 | ||
7166 | #define IPA_NEXT_TRACEFRAME(TF, TFOBJ) \ | |
7167 | (IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) \ | |
7168 | - ((IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) >= ipa_trace_buffer_ctrl.wrap) \ | |
7169 | ? (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo) \ | |
7170 | : 0)) | |
7171 | ||
7172 | tf = IPA_FIRST_TRACEFRAME (); | |
7173 | ||
7174 | while (ipa_traceframe_write_count - ipa_traceframe_read_count) | |
7175 | { | |
7176 | struct tracepoint *tpoint; | |
7177 | struct traceframe *tframe; | |
7178 | unsigned char *block; | |
7179 | struct traceframe ipa_tframe; | |
7180 | ||
7181 | if (read_inferior_memory (tf, (unsigned char *) &ipa_tframe, | |
7182 | offsetof (struct traceframe, data))) | |
7183 | error ("Uploading: couldn't read traceframe at %s\n", paddress (tf)); | |
7184 | ||
7185 | if (ipa_tframe.tpnum == 0) | |
7186 | fatal ("Uploading: No (more) fast traceframes, but " | |
7187 | "ipa_traceframe_count == %u??\n", | |
7188 | ipa_traceframe_write_count - ipa_traceframe_read_count); | |
7189 | ||
7190 | /* Note that this will be incorrect for multi-location | |
7191 | tracepoints... */ | |
7192 | tpoint = find_next_tracepoint_by_number (NULL, ipa_tframe.tpnum); | |
7193 | ||
7194 | tframe = add_traceframe (tpoint); | |
7195 | if (tframe == NULL) | |
7196 | { | |
7197 | trace_buffer_is_full = 1; | |
7198 | trace_debug ("Uploading: trace buffer is full"); | |
7199 | } | |
7200 | else | |
7201 | { | |
7202 | /* Copy the whole set of blocks in one go for now. FIXME: | |
7203 | split this in smaller blocks. */ | |
7204 | block = add_traceframe_block (tframe, ipa_tframe.data_size); | |
7205 | if (block != NULL) | |
7206 | { | |
493e2a69 MS |
7207 | if (read_inferior_memory (tf |
7208 | + offsetof (struct traceframe, data), | |
fa593d66 PA |
7209 | block, ipa_tframe.data_size)) |
7210 | error ("Uploading: Couldn't read traceframe data at %s\n", | |
7211 | paddress (tf + offsetof (struct traceframe, data))); | |
7212 | } | |
7213 | ||
7214 | trace_debug ("Uploading: traceframe didn't fit"); | |
7215 | finish_traceframe (tframe); | |
7216 | } | |
7217 | ||
7218 | tf = IPA_NEXT_TRACEFRAME (tf, &ipa_tframe); | |
7219 | ||
7220 | /* If we freed the traceframe that wrapped around, go back | |
7221 | to the non-wrap case. */ | |
7222 | if (tf < ipa_trace_buffer_ctrl.start) | |
7223 | { | |
7224 | trace_debug ("Lib: Discarding past the wraparound"); | |
7225 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
7226 | } | |
7227 | ipa_trace_buffer_ctrl.start = tf; | |
7228 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_ctrl.start; | |
7229 | ++ipa_traceframe_read_count; | |
7230 | ||
7231 | if (ipa_trace_buffer_ctrl.start == ipa_trace_buffer_ctrl.free | |
7232 | && ipa_trace_buffer_ctrl.start == ipa_trace_buffer_ctrl.end_free) | |
7233 | { | |
7234 | trace_debug ("Lib: buffer is fully empty. " | |
7235 | "Trace buffer [%d] start=%d free=%d endfree=%d", | |
7236 | curr_tbctrl_idx, | |
7237 | (int) (ipa_trace_buffer_ctrl.start | |
7238 | - ipa_trace_buffer_lo), | |
7239 | (int) (ipa_trace_buffer_ctrl.free | |
7240 | - ipa_trace_buffer_lo), | |
7241 | (int) (ipa_trace_buffer_ctrl.end_free | |
7242 | - ipa_trace_buffer_lo)); | |
7243 | ||
7244 | ipa_trace_buffer_ctrl.start = ipa_trace_buffer_lo; | |
7245 | ipa_trace_buffer_ctrl.free = ipa_trace_buffer_lo; | |
7246 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_hi; | |
7247 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
7248 | } | |
7249 | ||
7250 | trace_debug ("Uploaded a traceframe\n" | |
7251 | "Lib: Trace buffer [%d] start=%d free=%d " | |
7252 | "endfree=%d wrap=%d hi=%d", | |
7253 | curr_tbctrl_idx, | |
7254 | (int) (ipa_trace_buffer_ctrl.start - ipa_trace_buffer_lo), | |
7255 | (int) (ipa_trace_buffer_ctrl.free - ipa_trace_buffer_lo), | |
493e2a69 MS |
7256 | (int) (ipa_trace_buffer_ctrl.end_free |
7257 | - ipa_trace_buffer_lo), | |
fa593d66 PA |
7258 | (int) (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo), |
7259 | (int) (ipa_trace_buffer_hi - ipa_trace_buffer_lo)); | |
7260 | } | |
7261 | ||
7262 | if (write_inferior_memory (ipa_trace_buffer_ctrl_addr, | |
7263 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
7264 | sizeof (struct ipa_trace_buffer_control))) | |
7265 | return; | |
7266 | ||
7267 | write_inferior_integer (ipa_sym_addrs.addr_traceframe_read_count, | |
7268 | ipa_traceframe_read_count); | |
7269 | ||
7270 | trace_debug ("Done uploading traceframes [%d]\n", curr_tbctrl_idx); | |
7271 | ||
7272 | pause_all (1); | |
7273 | cancel_breakpoints (); | |
7274 | ||
7275 | delete_breakpoint (about_to_request_buffer_space_bkpt); | |
7276 | about_to_request_buffer_space_bkpt = NULL; | |
7277 | ||
7278 | unpause_all (1); | |
7279 | ||
7280 | if (trace_buffer_is_full) | |
7281 | stop_tracing (); | |
7282 | } | |
7283 | #endif | |
7284 | ||
7285 | #ifdef IN_PROCESS_AGENT | |
7286 | ||
0fb4aa4b PA |
7287 | IP_AGENT_EXPORT int ust_loaded; |
7288 | IP_AGENT_EXPORT char cmd_buf[CMD_BUF_SIZE]; | |
fa593d66 | 7289 | |
0fb4aa4b | 7290 | #ifdef HAVE_UST |
fa593d66 | 7291 | |
0fb4aa4b PA |
7292 | /* Static tracepoints. */ |
7293 | ||
7294 | /* UST puts a "struct tracepoint" in the global namespace, which | |
7295 | conflicts with our tracepoint. Arguably, being a library, it | |
7296 | shouldn't take ownership of such a generic name. We work around it | |
7297 | here. */ | |
7298 | #define tracepoint ust_tracepoint | |
7299 | #include <ust/ust.h> | |
7300 | #undef tracepoint | |
7301 | ||
7302 | extern int serialize_to_text (char *outbuf, int bufsize, | |
7303 | const char *fmt, va_list ap); | |
7304 | ||
7305 | #define GDB_PROBE_NAME "gdb" | |
7306 | ||
7307 | /* We dynamically search for the UST symbols instead of linking them | |
7308 | in. This lets the user decide if the application uses static | |
7309 | tracepoints, instead of always pulling libust.so in. This vector | |
7310 | holds pointers to all functions we care about. */ | |
7311 | ||
7312 | static struct | |
fa593d66 | 7313 | { |
0fb4aa4b PA |
7314 | int (*serialize_to_text) (char *outbuf, int bufsize, |
7315 | const char *fmt, va_list ap); | |
7316 | ||
7317 | int (*ltt_probe_register) (struct ltt_available_probe *pdata); | |
7318 | int (*ltt_probe_unregister) (struct ltt_available_probe *pdata); | |
7319 | ||
7320 | int (*ltt_marker_connect) (const char *channel, const char *mname, | |
7321 | const char *pname); | |
7322 | int (*ltt_marker_disconnect) (const char *channel, const char *mname, | |
7323 | const char *pname); | |
7324 | ||
7325 | void (*marker_iter_start) (struct marker_iter *iter); | |
7326 | void (*marker_iter_next) (struct marker_iter *iter); | |
7327 | void (*marker_iter_stop) (struct marker_iter *iter); | |
7328 | void (*marker_iter_reset) (struct marker_iter *iter); | |
7329 | } ust_ops; | |
7330 | ||
7331 | #include <dlfcn.h> | |
7332 | ||
7333 | /* Cast through typeof to catch incompatible API changes. Since UST | |
7334 | only builds with gcc, we can freely use gcc extensions here | |
7335 | too. */ | |
7336 | #define GET_UST_SYM(SYM) \ | |
7337 | do \ | |
7338 | { \ | |
7339 | if (ust_ops.SYM == NULL) \ | |
7340 | ust_ops.SYM = (typeof (&SYM)) dlsym (RTLD_DEFAULT, #SYM); \ | |
7341 | if (ust_ops.SYM == NULL) \ | |
7342 | return 0; \ | |
7343 | } while (0) | |
7344 | ||
7345 | #define USTF(SYM) ust_ops.SYM | |
7346 | ||
7347 | /* Get pointers to all libust.so functions we care about. */ | |
7348 | ||
7349 | static int | |
7350 | dlsym_ust (void) | |
7351 | { | |
7352 | GET_UST_SYM (serialize_to_text); | |
7353 | ||
7354 | GET_UST_SYM (ltt_probe_register); | |
7355 | GET_UST_SYM (ltt_probe_unregister); | |
7356 | GET_UST_SYM (ltt_marker_connect); | |
7357 | GET_UST_SYM (ltt_marker_disconnect); | |
7358 | ||
7359 | GET_UST_SYM (marker_iter_start); | |
7360 | GET_UST_SYM (marker_iter_next); | |
7361 | GET_UST_SYM (marker_iter_stop); | |
7362 | GET_UST_SYM (marker_iter_reset); | |
7363 | ||
7364 | ust_loaded = 1; | |
7365 | return 1; | |
fa593d66 PA |
7366 | } |
7367 | ||
0fb4aa4b PA |
7368 | /* Given an UST marker, return the matching gdb static tracepoint. |
7369 | The match is done by address. */ | |
7370 | ||
7371 | static struct tracepoint * | |
7372 | ust_marker_to_static_tracepoint (const struct marker *mdata) | |
7373 | { | |
7374 | struct tracepoint *tpoint; | |
7375 | ||
7376 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
7377 | { | |
d248b706 | 7378 | if (tpoint->type != static_tracepoint) |
0fb4aa4b PA |
7379 | continue; |
7380 | ||
7381 | if (tpoint->address == (uintptr_t) mdata->location) | |
7382 | return tpoint; | |
7383 | } | |
7384 | ||
7385 | return NULL; | |
7386 | } | |
7387 | ||
7388 | /* The probe function we install on lttng/ust markers. Whenever a | |
7389 | probed ust marker is hit, this function is called. This is similar | |
7390 | to gdb_collect, only for static tracepoints, instead of fast | |
7391 | tracepoints. */ | |
7392 | ||
7393 | static void | |
7394 | gdb_probe (const struct marker *mdata, void *probe_private, | |
7395 | struct registers *regs, void *call_private, | |
7396 | const char *fmt, va_list *args) | |
7397 | { | |
7398 | struct tracepoint *tpoint; | |
7399 | struct static_tracepoint_ctx ctx; | |
7400 | ||
7401 | /* Don't do anything until the trace run is completely set up. */ | |
7402 | if (!tracing) | |
7403 | { | |
7404 | trace_debug ("gdb_probe: not tracing\n"); | |
7405 | return; | |
7406 | } | |
7407 | ||
7408 | ctx.base.type = static_tracepoint; | |
7409 | ctx.regcache_initted = 0; | |
7410 | ctx.regs = regs; | |
7411 | ctx.fmt = fmt; | |
7412 | ctx.args = args; | |
7413 | ||
7414 | /* Wrap the regblock in a register cache (in the stack, we don't | |
7415 | want to malloc here). */ | |
7416 | ctx.regspace = alloca (register_cache_size ()); | |
7417 | if (ctx.regspace == NULL) | |
7418 | { | |
7419 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
7420 | return; | |
7421 | } | |
7422 | ||
7423 | tpoint = ust_marker_to_static_tracepoint (mdata); | |
7424 | if (tpoint == NULL) | |
7425 | { | |
7426 | trace_debug ("gdb_probe: marker not known: " | |
7427 | "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"", | |
7428 | mdata->location, mdata->channel, | |
7429 | mdata->name, mdata->format); | |
7430 | return; | |
7431 | } | |
7432 | ||
d248b706 KY |
7433 | if (!tpoint->enabled) |
7434 | { | |
7435 | trace_debug ("gdb_probe: tracepoint disabled"); | |
7436 | return; | |
7437 | } | |
7438 | ||
0fb4aa4b PA |
7439 | ctx.tpoint = tpoint; |
7440 | ||
7441 | trace_debug ("gdb_probe: collecting marker: " | |
7442 | "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"", | |
7443 | mdata->location, mdata->channel, | |
7444 | mdata->name, mdata->format); | |
7445 | ||
7446 | /* Test the condition if present, and collect if true. */ | |
7447 | if (tpoint->cond == NULL | |
7448 | || condition_true_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
7449 | tpoint)) | |
7450 | { | |
7451 | collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
7452 | tpoint->address, tpoint); | |
7453 | ||
7454 | if (stopping_tracepoint | |
7455 | || trace_buffer_is_full | |
7456 | || expr_eval_result != expr_eval_no_error) | |
7457 | stop_tracing (); | |
7458 | } | |
7459 | else | |
7460 | { | |
7461 | /* If there was a condition and it evaluated to false, the only | |
7462 | way we would stop tracing is if there was an error during | |
7463 | condition expression evaluation. */ | |
7464 | if (expr_eval_result != expr_eval_no_error) | |
7465 | stop_tracing (); | |
7466 | } | |
7467 | } | |
7468 | ||
7469 | /* Called if the gdb static tracepoint requested collecting "$_sdata", | |
7470 | static tracepoint string data. This is a string passed to the | |
7471 | tracing library by the user, at the time of the tracepoint marker | |
7472 | call. E.g., in the UST marker call: | |
7473 | ||
7474 | trace_mark (ust, bar33, "str %s", "FOOBAZ"); | |
7475 | ||
7476 | the collected data is "str FOOBAZ". | |
7477 | */ | |
7478 | ||
7479 | static void | |
7480 | collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
7481 | CORE_ADDR stop_pc, | |
7482 | struct tracepoint *tpoint, | |
7483 | struct traceframe *tframe) | |
7484 | { | |
7485 | struct static_tracepoint_ctx *umd = (struct static_tracepoint_ctx *) ctx; | |
7486 | unsigned char *bufspace; | |
7487 | int size; | |
7488 | va_list copy; | |
7489 | unsigned short blocklen; | |
7490 | ||
7491 | if (umd == NULL) | |
7492 | { | |
7493 | trace_debug ("Wanted to collect static trace data, " | |
7494 | "but there's no static trace data"); | |
7495 | return; | |
7496 | } | |
7497 | ||
7498 | va_copy (copy, *umd->args); | |
7499 | size = USTF(serialize_to_text) (NULL, 0, umd->fmt, copy); | |
7500 | va_end (copy); | |
7501 | ||
7502 | trace_debug ("Want to collect ust data"); | |
7503 | ||
7504 | /* 'S' + size + string */ | |
7505 | bufspace = add_traceframe_block (tframe, | |
7506 | 1 + sizeof (blocklen) + size + 1); | |
7507 | if (bufspace == NULL) | |
7508 | { | |
7509 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
7510 | return; | |
7511 | } | |
7512 | ||
7513 | /* Identify a static trace data block. */ | |
7514 | *bufspace = 'S'; | |
7515 | ||
7516 | blocklen = size + 1; | |
7517 | memcpy (bufspace + 1, &blocklen, sizeof (blocklen)); | |
7518 | ||
7519 | va_copy (copy, *umd->args); | |
7520 | USTF(serialize_to_text) ((char *) bufspace + 1 + sizeof (blocklen), | |
7521 | size + 1, umd->fmt, copy); | |
7522 | va_end (copy); | |
7523 | ||
7524 | trace_debug ("Storing static tracepoint data in regblock: %s", | |
7525 | bufspace + 1 + sizeof (blocklen)); | |
7526 | } | |
7527 | ||
7528 | /* The probe to register with lttng/ust. */ | |
7529 | static struct ltt_available_probe gdb_ust_probe = | |
7530 | { | |
7531 | GDB_PROBE_NAME, | |
7532 | NULL, | |
7533 | gdb_probe, | |
7534 | }; | |
7535 | ||
7536 | #endif /* HAVE_UST */ | |
7537 | #endif /* IN_PROCESS_AGENT */ | |
7538 | ||
7539 | #ifdef HAVE_UST | |
7540 | ||
7541 | #include <sys/socket.h> | |
7542 | #include <sys/un.h> | |
7543 | ||
7544 | #ifndef UNIX_PATH_MAX | |
7545 | #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path) | |
7546 | #endif | |
7547 | ||
7548 | /* Where we put the socked used for synchronization. */ | |
7549 | #define SOCK_DIR P_tmpdir | |
7550 | ||
7551 | #endif /* HAVE_UST */ | |
7552 | ||
7553 | #ifndef IN_PROCESS_AGENT | |
7554 | ||
7555 | #ifdef HAVE_UST | |
7556 | ||
7557 | static int | |
7558 | gdb_ust_connect_sync_socket (int pid) | |
7559 | { | |
7560 | struct sockaddr_un addr; | |
7561 | int res, fd; | |
7562 | char path[UNIX_PATH_MAX]; | |
7563 | ||
6cebaf6e | 7564 | res = xsnprintf (path, UNIX_PATH_MAX, "%s/gdb_ust%d", SOCK_DIR, pid); |
0fb4aa4b PA |
7565 | if (res >= UNIX_PATH_MAX) |
7566 | { | |
7567 | trace_debug ("string overflow allocating socket name"); | |
7568 | return -1; | |
7569 | } | |
7570 | ||
7571 | res = fd = socket (PF_UNIX, SOCK_STREAM, 0); | |
7572 | if (res == -1) | |
7573 | { | |
7574 | warning ("error opening sync socket: %s\n", strerror (errno)); | |
7575 | return -1; | |
7576 | } | |
7577 | ||
7578 | addr.sun_family = AF_UNIX; | |
7579 | ||
6cebaf6e | 7580 | res = xsnprintf (addr.sun_path, UNIX_PATH_MAX, "%s", path); |
0fb4aa4b PA |
7581 | if (res >= UNIX_PATH_MAX) |
7582 | { | |
7583 | warning ("string overflow allocating socket name\n"); | |
7584 | close (fd); | |
7585 | return -1; | |
7586 | } | |
7587 | ||
7588 | res = connect (fd, (struct sockaddr *) &addr, sizeof (addr)); | |
7589 | if (res == -1) | |
7590 | { | |
7591 | warning ("error connecting sync socket (%s): %s. " | |
7592 | "Make sure the directory exists and that it is writable.", | |
7593 | path, strerror (errno)); | |
7594 | close (fd); | |
7595 | return -1; | |
7596 | } | |
7597 | ||
7598 | return fd; | |
7599 | } | |
7600 | ||
7601 | /* Resume thread PTID. */ | |
7602 | ||
7603 | static void | |
7604 | resume_thread (ptid_t ptid) | |
7605 | { | |
7606 | struct thread_resume resume_info; | |
7607 | ||
7608 | resume_info.thread = ptid; | |
7609 | resume_info.kind = resume_continue; | |
7610 | resume_info.sig = TARGET_SIGNAL_0; | |
7611 | (*the_target->resume) (&resume_info, 1); | |
7612 | } | |
7613 | ||
7614 | /* Stop thread PTID. */ | |
7615 | ||
7616 | static void | |
7617 | stop_thread (ptid_t ptid) | |
7618 | { | |
7619 | struct thread_resume resume_info; | |
7620 | ||
7621 | resume_info.thread = ptid; | |
7622 | resume_info.kind = resume_stop; | |
7623 | resume_info.sig = TARGET_SIGNAL_0; | |
7624 | (*the_target->resume) (&resume_info, 1); | |
7625 | } | |
7626 | ||
7627 | /* Ask the in-process agent to run a command. Since we don't want to | |
7628 | have to handle the IPA hitting breakpoints while running the | |
7629 | command, we pause all threads, remove all breakpoints, and then set | |
7630 | the helper thread re-running. We communicate with the helper | |
7631 | thread by means of direct memory xfering, and a socket for | |
7632 | synchronization. */ | |
7633 | ||
7634 | static int | |
7635 | run_inferior_command (char *cmd) | |
7636 | { | |
7637 | int err = -1; | |
7638 | int fd = -1; | |
7639 | int pid = ptid_get_pid (current_inferior->entry.id); | |
7640 | int tid; | |
7641 | ptid_t ptid = null_ptid; | |
7642 | ||
7643 | trace_debug ("run_inferior_command: running: %s", cmd); | |
7644 | ||
7645 | pause_all (0); | |
7646 | uninsert_all_breakpoints (); | |
7647 | ||
7648 | if (read_inferior_integer (ipa_sym_addrs.addr_helper_thread_id, &tid)) | |
7649 | { | |
7650 | warning ("Error reading helper thread's id in lib"); | |
7651 | goto out; | |
7652 | } | |
7653 | ||
7654 | if (tid == 0) | |
7655 | { | |
7656 | warning ("helper thread not initialized yet"); | |
7657 | goto out; | |
7658 | } | |
7659 | ||
7660 | if (write_inferior_memory (ipa_sym_addrs.addr_cmd_buf, | |
7661 | (unsigned char *) cmd, strlen (cmd) + 1)) | |
7662 | { | |
7663 | warning ("Error writing command"); | |
7664 | goto out; | |
7665 | } | |
7666 | ||
7667 | ptid = ptid_build (pid, tid, 0); | |
7668 | ||
7669 | resume_thread (ptid); | |
7670 | ||
7671 | fd = gdb_ust_connect_sync_socket (pid); | |
7672 | if (fd >= 0) | |
7673 | { | |
7674 | char buf[1] = ""; | |
7675 | int ret; | |
7676 | ||
7677 | trace_debug ("signalling helper thread"); | |
7678 | ||
7679 | do | |
7680 | { | |
7681 | ret = write (fd, buf, 1); | |
7682 | } while (ret == -1 && errno == EINTR); | |
7683 | ||
7684 | trace_debug ("waiting for helper thread's response"); | |
7685 | ||
7686 | do | |
7687 | { | |
7688 | ret = read (fd, buf, 1); | |
7689 | } while (ret == -1 && errno == EINTR); | |
7690 | ||
7691 | close (fd); | |
7692 | ||
7693 | trace_debug ("helper thread's response received"); | |
7694 | } | |
7695 | ||
7696 | out: | |
7697 | ||
7698 | /* Need to read response with the inferior stopped. */ | |
7699 | if (!ptid_equal (ptid, null_ptid)) | |
7700 | { | |
7701 | int was_non_stop = non_stop; | |
7702 | struct target_waitstatus status; | |
7703 | ||
7704 | stop_thread (ptid); | |
7705 | non_stop = 1; | |
7706 | mywait (ptid, &status, 0, 0); | |
7707 | non_stop = was_non_stop; | |
7708 | } | |
7709 | ||
7710 | if (fd >= 0) | |
7711 | { | |
7712 | if (read_inferior_memory (ipa_sym_addrs.addr_cmd_buf, | |
7713 | (unsigned char *) cmd, CMD_BUF_SIZE)) | |
7714 | { | |
7715 | warning ("Error reading command response"); | |
7716 | } | |
7717 | else | |
7718 | { | |
7719 | err = 0; | |
7720 | trace_debug ("run_inferior_command: response: %s", cmd); | |
7721 | } | |
7722 | } | |
7723 | ||
7724 | reinsert_all_breakpoints (); | |
7725 | unpause_all (0); | |
7726 | ||
7727 | return err; | |
7728 | } | |
7729 | ||
7730 | #else /* HAVE_UST */ | |
7731 | ||
7732 | static int | |
7733 | run_inferior_command (char *cmd) | |
7734 | { | |
7735 | return -1; | |
7736 | } | |
7737 | ||
7738 | #endif /* HAVE_UST */ | |
7739 | ||
7740 | #else /* !IN_PROCESS_AGENT */ | |
7741 | ||
7742 | /* Thread ID of the helper thread. GDBserver reads this to know which | |
7743 | is the help thread. This is an LWP id on Linux. */ | |
7744 | int helper_thread_id; | |
7745 | ||
7746 | #ifdef HAVE_UST | |
7747 | ||
7748 | static int | |
7749 | init_named_socket (const char *name) | |
7750 | { | |
7751 | int result, fd; | |
7752 | struct sockaddr_un addr; | |
7753 | ||
7754 | result = fd = socket (PF_UNIX, SOCK_STREAM, 0); | |
7755 | if (result == -1) | |
7756 | { | |
7757 | warning ("socket creation failed: %s", strerror (errno)); | |
7758 | return -1; | |
7759 | } | |
7760 | ||
7761 | addr.sun_family = AF_UNIX; | |
7762 | ||
7763 | strncpy (addr.sun_path, name, UNIX_PATH_MAX); | |
7764 | addr.sun_path[UNIX_PATH_MAX - 1] = '\0'; | |
7765 | ||
7766 | result = access (name, F_OK); | |
7767 | if (result == 0) | |
7768 | { | |
7769 | /* File exists. */ | |
7770 | result = unlink (name); | |
7771 | if (result == -1) | |
7772 | { | |
7773 | warning ("unlink failed: %s", strerror (errno)); | |
7774 | close (fd); | |
7775 | return -1; | |
7776 | } | |
7777 | warning ("socket %s already exists; overwriting", name); | |
7778 | } | |
7779 | ||
7780 | result = bind (fd, (struct sockaddr *) &addr, sizeof (addr)); | |
7781 | if (result == -1) | |
7782 | { | |
7783 | warning ("bind failed: %s", strerror (errno)); | |
7784 | close (fd); | |
7785 | return -1; | |
7786 | } | |
7787 | ||
7788 | result = listen (fd, 1); | |
7789 | if (result == -1) | |
7790 | { | |
7791 | warning ("listen: %s", strerror (errno)); | |
7792 | close (fd); | |
7793 | return -1; | |
7794 | } | |
7795 | ||
7796 | return fd; | |
7797 | } | |
7798 | ||
7799 | static int | |
7800 | gdb_ust_socket_init (void) | |
7801 | { | |
7802 | int result, fd; | |
7803 | char name[UNIX_PATH_MAX]; | |
7804 | ||
6cebaf6e | 7805 | result = xsnprintf (name, UNIX_PATH_MAX, "%s/gdb_ust%d", |
7806 | SOCK_DIR, getpid ()); | |
0fb4aa4b PA |
7807 | if (result >= UNIX_PATH_MAX) |
7808 | { | |
7809 | trace_debug ("string overflow allocating socket name"); | |
7810 | return -1; | |
7811 | } | |
7812 | ||
7813 | fd = init_named_socket (name); | |
7814 | if (fd < 0) | |
7815 | warning ("Error initializing named socket (%s) for communication with the " | |
7816 | "ust helper thread. Check that directory exists and that it " | |
7817 | "is writable.", name); | |
7818 | ||
7819 | return fd; | |
7820 | } | |
7821 | ||
7822 | /* Return an hexstr version of the STR C string, fit for sending to | |
7823 | GDB. */ | |
7824 | ||
7825 | static char * | |
7826 | cstr_to_hexstr (const char *str) | |
7827 | { | |
7828 | int len = strlen (str); | |
7829 | char *hexstr = xmalloc (len * 2 + 1); | |
7830 | convert_int_to_ascii ((gdb_byte *) str, hexstr, len); | |
7831 | return hexstr; | |
7832 | } | |
7833 | ||
7834 | /* The next marker to be returned on a qTsSTM command. */ | |
7835 | static const struct marker *next_st; | |
7836 | ||
7837 | /* Returns the first known marker. */ | |
7838 | ||
7839 | struct marker * | |
7840 | first_marker (void) | |
7841 | { | |
7842 | struct marker_iter iter; | |
7843 | ||
7844 | USTF(marker_iter_reset) (&iter); | |
7845 | USTF(marker_iter_start) (&iter); | |
7846 | ||
7847 | return iter.marker; | |
7848 | } | |
7849 | ||
7850 | /* Returns the marker following M. */ | |
7851 | ||
7852 | const struct marker * | |
7853 | next_marker (const struct marker *m) | |
7854 | { | |
7855 | struct marker_iter iter; | |
7856 | ||
7857 | USTF(marker_iter_reset) (&iter); | |
7858 | USTF(marker_iter_start) (&iter); | |
7859 | ||
7860 | for (; iter.marker != NULL; USTF(marker_iter_next) (&iter)) | |
7861 | { | |
7862 | if (iter.marker == m) | |
7863 | { | |
7864 | USTF(marker_iter_next) (&iter); | |
7865 | return iter.marker; | |
7866 | } | |
7867 | } | |
7868 | ||
7869 | return NULL; | |
7870 | } | |
7871 | ||
7872 | /* Compose packet that is the response to the qTsSTM/qTfSTM/qTSTMat | |
7873 | packets. */ | |
7874 | ||
7875 | static void | |
7876 | response_ust_marker (char *packet, const struct marker *st) | |
7877 | { | |
7878 | char *strid, *format, *tmp; | |
7879 | ||
7880 | next_st = next_marker (st); | |
7881 | ||
7882 | tmp = xmalloc (strlen (st->channel) + 1 + | |
7883 | strlen (st->name) + 1); | |
7884 | sprintf (tmp, "%s/%s", st->channel, st->name); | |
7885 | ||
7886 | strid = cstr_to_hexstr (tmp); | |
7887 | free (tmp); | |
7888 | ||
7889 | format = cstr_to_hexstr (st->format); | |
7890 | ||
7891 | sprintf (packet, "m%s:%s:%s", | |
7892 | paddress ((uintptr_t) st->location), | |
7893 | strid, | |
7894 | format); | |
7895 | ||
7896 | free (strid); | |
7897 | free (format); | |
7898 | } | |
7899 | ||
7900 | /* Return the first static tracepoint, and initialize the state | |
7901 | machine that will iterate through all the static tracepoints. */ | |
7902 | ||
7903 | static void | |
7904 | cmd_qtfstm (char *packet) | |
7905 | { | |
7906 | trace_debug ("Returning first trace state variable definition"); | |
7907 | ||
7908 | if (first_marker ()) | |
7909 | response_ust_marker (packet, first_marker ()); | |
7910 | else | |
7911 | strcpy (packet, "l"); | |
7912 | } | |
7913 | ||
7914 | /* Return additional trace state variable definitions. */ | |
7915 | ||
7916 | static void | |
7917 | cmd_qtsstm (char *packet) | |
7918 | { | |
7919 | trace_debug ("Returning static tracepoint"); | |
7920 | ||
7921 | if (next_st) | |
7922 | response_ust_marker (packet, next_st); | |
7923 | else | |
7924 | strcpy (packet, "l"); | |
7925 | } | |
7926 | ||
7927 | /* Disconnect the GDB probe from a marker at a given address. */ | |
7928 | ||
7929 | static void | |
7930 | unprobe_marker_at (char *packet) | |
7931 | { | |
7932 | char *p = packet; | |
7933 | ULONGEST address; | |
7934 | struct marker_iter iter; | |
7935 | ||
7936 | p += sizeof ("unprobe_marker_at:") - 1; | |
7937 | ||
7938 | p = unpack_varlen_hex (p, &address); | |
7939 | ||
7940 | USTF(marker_iter_reset) (&iter); | |
7941 | USTF(marker_iter_start) (&iter); | |
7942 | for (; iter.marker != NULL; USTF(marker_iter_next) (&iter)) | |
7943 | if ((uintptr_t ) iter.marker->location == address) | |
7944 | { | |
7945 | int result; | |
7946 | ||
7947 | result = USTF(ltt_marker_disconnect) (iter.marker->channel, | |
7948 | iter.marker->name, | |
7949 | GDB_PROBE_NAME); | |
7950 | if (result < 0) | |
7951 | warning ("could not disable marker %s/%s", | |
7952 | iter.marker->channel, iter.marker->name); | |
7953 | break; | |
7954 | } | |
7955 | } | |
7956 | ||
7957 | /* Connect the GDB probe to a marker at a given address. */ | |
7958 | ||
7959 | static int | |
7960 | probe_marker_at (char *packet) | |
7961 | { | |
7962 | char *p = packet; | |
7963 | ULONGEST address; | |
7964 | struct marker_iter iter; | |
7965 | struct marker *m; | |
7966 | ||
7967 | p += sizeof ("probe_marker_at:") - 1; | |
7968 | ||
7969 | p = unpack_varlen_hex (p, &address); | |
7970 | ||
7971 | USTF(marker_iter_reset) (&iter); | |
7972 | ||
7973 | for (USTF(marker_iter_start) (&iter), m = iter.marker; | |
7974 | m != NULL; | |
7975 | USTF(marker_iter_next) (&iter), m = iter.marker) | |
7976 | if ((uintptr_t ) m->location == address) | |
7977 | { | |
7978 | int result; | |
7979 | ||
7980 | trace_debug ("found marker for address. " | |
7981 | "ltt_marker_connect (marker = %s/%s)", | |
7982 | m->channel, m->name); | |
7983 | ||
493e2a69 MS |
7984 | result = USTF(ltt_marker_connect) (m->channel, m->name, |
7985 | GDB_PROBE_NAME); | |
0fb4aa4b PA |
7986 | if (result && result != -EEXIST) |
7987 | trace_debug ("ltt_marker_connect (marker = %s/%s, errno = %d)", | |
7988 | m->channel, m->name, -result); | |
7989 | ||
7990 | if (result < 0) | |
7991 | { | |
7992 | sprintf (packet, "E.could not connect marker: channel=%s, name=%s", | |
7993 | m->channel, m->name); | |
7994 | return -1; | |
7995 | } | |
7996 | ||
7997 | strcpy (packet, "OK"); | |
7998 | return 0; | |
7999 | } | |
8000 | ||
8001 | sprintf (packet, "E.no marker found at 0x%s", paddress (address)); | |
8002 | return -1; | |
8003 | } | |
8004 | ||
8005 | static int | |
8006 | cmd_qtstmat (char *packet) | |
8007 | { | |
8008 | char *p = packet; | |
8009 | ULONGEST address; | |
8010 | struct marker_iter iter; | |
8011 | struct marker *m; | |
8012 | ||
8013 | p += sizeof ("qTSTMat:") - 1; | |
8014 | ||
8015 | p = unpack_varlen_hex (p, &address); | |
8016 | ||
8017 | USTF(marker_iter_reset) (&iter); | |
8018 | ||
8019 | for (USTF(marker_iter_start) (&iter), m = iter.marker; | |
8020 | m != NULL; | |
8021 | USTF(marker_iter_next) (&iter), m = iter.marker) | |
8022 | if ((uintptr_t ) m->location == address) | |
8023 | { | |
8024 | response_ust_marker (packet, m); | |
8025 | return 0; | |
8026 | } | |
8027 | ||
8028 | strcpy (packet, "l"); | |
8029 | return -1; | |
8030 | } | |
8031 | ||
82067193 YQ |
8032 | #include <sys/syscall.h> |
8033 | ||
0fb4aa4b PA |
8034 | static void * |
8035 | gdb_ust_thread (void *arg) | |
8036 | { | |
8037 | int listen_fd; | |
8038 | ||
8039 | while (1) | |
8040 | { | |
8041 | listen_fd = gdb_ust_socket_init (); | |
8042 | ||
0fb4aa4b PA |
8043 | if (helper_thread_id == 0) |
8044 | helper_thread_id = syscall (SYS_gettid); | |
0fb4aa4b PA |
8045 | |
8046 | if (listen_fd == -1) | |
8047 | { | |
8048 | warning ("could not create sync socket\n"); | |
8049 | break; | |
8050 | } | |
8051 | ||
8052 | while (1) | |
8053 | { | |
8054 | socklen_t tmp; | |
8055 | struct sockaddr_un sockaddr; | |
8056 | int fd; | |
8057 | char buf[1]; | |
8058 | int ret; | |
8059 | ||
8060 | tmp = sizeof (sockaddr); | |
8061 | ||
8062 | do | |
8063 | { | |
8064 | fd = accept (listen_fd, &sockaddr, &tmp); | |
8065 | } | |
8066 | /* It seems an ERESTARTSYS can escape out of accept. */ | |
8067 | while (fd == -512 || (fd == -1 && errno == EINTR)); | |
8068 | ||
8069 | if (fd < 0) | |
8070 | { | |
8071 | warning ("Accept returned %d, error: %s\n", | |
8072 | fd, strerror (errno)); | |
8073 | break; | |
8074 | } | |
8075 | ||
8076 | do | |
8077 | { | |
8078 | ret = read (fd, buf, 1); | |
8079 | } while (ret == -1 && errno == EINTR); | |
8080 | ||
8081 | if (ret == -1) | |
8082 | { | |
8083 | warning ("reading socket (fd=%d) failed with %s", | |
8084 | fd, strerror (errno)); | |
8085 | close (fd); | |
8086 | break; | |
8087 | } | |
8088 | ||
8089 | if (cmd_buf[0]) | |
8090 | { | |
8091 | if (strcmp ("qTfSTM", cmd_buf) == 0) | |
8092 | { | |
8093 | cmd_qtfstm (cmd_buf); | |
8094 | } | |
8095 | else if (strcmp ("qTsSTM", cmd_buf) == 0) | |
8096 | { | |
8097 | cmd_qtsstm (cmd_buf); | |
8098 | } | |
8099 | else if (strncmp ("unprobe_marker_at:", | |
8100 | cmd_buf, | |
8101 | sizeof ("unprobe_marker_at:") - 1) == 0) | |
8102 | { | |
8103 | unprobe_marker_at (cmd_buf); | |
8104 | } | |
8105 | else if (strncmp ("probe_marker_at:", | |
8106 | cmd_buf, | |
8107 | sizeof ("probe_marker_at:") - 1) == 0) | |
8108 | { | |
8109 | probe_marker_at (cmd_buf); | |
8110 | } | |
8111 | else if (strncmp ("qTSTMat:", | |
8112 | cmd_buf, | |
8113 | sizeof ("qTSTMat:") - 1) == 0) | |
8114 | { | |
8115 | cmd_qtstmat (cmd_buf); | |
8116 | } | |
8117 | else if (strcmp (cmd_buf, "help") == 0) | |
8118 | { | |
8119 | strcpy (cmd_buf, "for help, press F1\n"); | |
8120 | } | |
8121 | else | |
8122 | strcpy (cmd_buf, ""); | |
8123 | } | |
8124 | ||
712c6575 YQ |
8125 | /* Fix compiler's warning: ignoring return value of 'write'. */ |
8126 | ret = write (fd, buf, 1); | |
0fb4aa4b PA |
8127 | close (fd); |
8128 | } | |
8129 | } | |
8130 | ||
8131 | return NULL; | |
8132 | } | |
8133 | ||
8134 | #include <signal.h> | |
8135 | ||
8136 | static void | |
8137 | gdb_ust_init (void) | |
8138 | { | |
8139 | int res; | |
8140 | pthread_t thread; | |
8141 | sigset_t new_mask; | |
8142 | sigset_t orig_mask; | |
8143 | ||
8144 | if (!dlsym_ust ()) | |
8145 | return; | |
8146 | ||
8147 | /* We want the helper thread to be as transparent as possible, so | |
8148 | have it inherit an all-signals-blocked mask. */ | |
8149 | ||
8150 | sigfillset (&new_mask); | |
8151 | res = pthread_sigmask (SIG_SETMASK, &new_mask, &orig_mask); | |
8152 | if (res) | |
8153 | fatal ("pthread_sigmask (1) failed: %s", strerror (res)); | |
8154 | ||
8155 | res = pthread_create (&thread, | |
8156 | NULL, | |
8157 | gdb_ust_thread, | |
8158 | NULL); | |
8159 | ||
8160 | res = pthread_sigmask (SIG_SETMASK, &orig_mask, NULL); | |
8161 | if (res) | |
8162 | fatal ("pthread_sigmask (2) failed: %s", strerror (res)); | |
8163 | ||
8164 | while (helper_thread_id == 0) | |
8165 | usleep (1); | |
8166 | ||
8167 | USTF(ltt_probe_register) (&gdb_ust_probe); | |
8168 | } | |
8169 | ||
8170 | #endif /* HAVE_UST */ | |
8171 | ||
8172 | #include <sys/mman.h> | |
8173 | #include <fcntl.h> | |
8174 | ||
8175 | IP_AGENT_EXPORT char *gdb_tp_heap_buffer; | |
8176 | IP_AGENT_EXPORT char *gdb_jump_pad_buffer; | |
8177 | IP_AGENT_EXPORT char *gdb_jump_pad_buffer_end; | |
405f8e94 SS |
8178 | IP_AGENT_EXPORT char *gdb_trampoline_buffer; |
8179 | IP_AGENT_EXPORT char *gdb_trampoline_buffer_end; | |
8180 | IP_AGENT_EXPORT char *gdb_trampoline_buffer_error; | |
8181 | ||
8182 | /* Record the result of getting buffer space for fast tracepoint | |
8183 | trampolines. Any error message is copied, since caller may not be | |
8184 | using persistent storage. */ | |
8185 | ||
8186 | void | |
8187 | set_trampoline_buffer_space (CORE_ADDR begin, CORE_ADDR end, char *errmsg) | |
8188 | { | |
8189 | gdb_trampoline_buffer = (char *) (uintptr_t) begin; | |
8190 | gdb_trampoline_buffer_end = (char *) (uintptr_t) end; | |
8191 | if (errmsg) | |
8192 | strncpy (gdb_trampoline_buffer_error, errmsg, 99); | |
8193 | else | |
8194 | strcpy (gdb_trampoline_buffer_error, "no buffer passed"); | |
8195 | } | |
0fb4aa4b PA |
8196 | |
8197 | static void __attribute__ ((constructor)) | |
8198 | initialize_tracepoint_ftlib (void) | |
8199 | { | |
8200 | initialize_tracepoint (); | |
8201 | ||
8202 | #ifdef HAVE_UST | |
8203 | gdb_ust_init (); | |
8204 | #endif | |
8205 | } | |
8206 | ||
8207 | #endif /* IN_PROCESS_AGENT */ | |
fa593d66 | 8208 | |
f196051f SS |
8209 | /* Return a timestamp, expressed as microseconds of the usual Unix |
8210 | time. (As the result is a 64-bit number, it will not overflow any | |
8211 | time soon.) */ | |
8212 | ||
219f2f23 | 8213 | static LONGEST |
f196051f | 8214 | get_timestamp (void) |
219f2f23 PA |
8215 | { |
8216 | struct timeval tv; | |
8217 | ||
8218 | if (gettimeofday (&tv, 0) != 0) | |
8219 | return -1; | |
8220 | else | |
8221 | return (LONGEST) tv.tv_sec * 1000000 + tv.tv_usec; | |
8222 | } | |
8223 | ||
8224 | void | |
8225 | initialize_tracepoint (void) | |
8226 | { | |
8227 | /* There currently no way to change the buffer size. */ | |
8228 | const int sizeOfBuffer = 5 * 1024 * 1024; | |
8229 | unsigned char *buf = xmalloc (sizeOfBuffer); | |
8230 | init_trace_buffer (buf, sizeOfBuffer); | |
8231 | ||
8232 | /* Wire trace state variable 1 to be the timestamp. This will be | |
8233 | uploaded to GDB upon connection and become one of its trace state | |
8234 | variables. (In case you're wondering, if GDB already has a trace | |
8235 | variable numbered 1, it will be renumbered.) */ | |
fa593d66 | 8236 | create_trace_state_variable (1, 0); |
219f2f23 | 8237 | set_trace_state_variable_name (1, "trace_timestamp"); |
f196051f | 8238 | set_trace_state_variable_getter (1, get_timestamp); |
fa593d66 PA |
8239 | |
8240 | #ifdef IN_PROCESS_AGENT | |
8241 | { | |
8242 | int pagesize; | |
8243 | pagesize = sysconf (_SC_PAGE_SIZE); | |
8244 | if (pagesize == -1) | |
8245 | fatal ("sysconf"); | |
8246 | ||
8247 | gdb_tp_heap_buffer = xmalloc (5 * 1024 * 1024); | |
8248 | ||
8249 | /* Allocate scratch buffer aligned on a page boundary. */ | |
8250 | gdb_jump_pad_buffer = memalign (pagesize, pagesize * 20); | |
8251 | gdb_jump_pad_buffer_end = gdb_jump_pad_buffer + pagesize * 20; | |
8252 | ||
8253 | /* Make it writable and executable. */ | |
8254 | if (mprotect (gdb_jump_pad_buffer, pagesize * 20, | |
8255 | PROT_READ | PROT_WRITE | PROT_EXEC) != 0) | |
8256 | fatal ("\ | |
8257 | initialize_tracepoint: mprotect(%p, %d, PROT_READ|PROT_EXEC) failed with %s", | |
8258 | gdb_jump_pad_buffer, pagesize * 20, strerror (errno)); | |
8259 | } | |
8260 | ||
405f8e94 SS |
8261 | gdb_trampoline_buffer = gdb_trampoline_buffer_end = 0; |
8262 | ||
8263 | /* It's not a fatal error for something to go wrong with trampoline | |
8264 | buffer setup, but it can be mysterious, so create a channel to | |
8265 | report back on what went wrong, using a fixed size since we may | |
8266 | not be able to allocate space later when the problem occurs. */ | |
8267 | gdb_trampoline_buffer_error = xmalloc (IPA_BUFSIZ); | |
8268 | ||
8269 | strcpy (gdb_trampoline_buffer_error, "No errors reported"); | |
8270 | ||
fa593d66 PA |
8271 | initialize_low_tracepoint (); |
8272 | #endif | |
219f2f23 | 8273 | } |