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219f2f23 | 1 | /* Tracepoint code for remote server for GDB. |
0b302171 | 2 | Copyright (C) 2009-2012 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" | |
2fa291ac YQ |
20 | #include "agent.h" |
21 | ||
219f2f23 PA |
22 | #include <ctype.h> |
23 | #include <fcntl.h> | |
24 | #include <unistd.h> | |
25 | #include <sys/time.h> | |
fa593d66 | 26 | #include <stddef.h> |
5f18041e | 27 | #include <inttypes.h> |
fa593d66 | 28 | #include <stdint.h> |
0ab5faf9 | 29 | |
5e1dc496 | 30 | #include "ax.h" |
219f2f23 | 31 | |
61adf464 | 32 | /* This file is built for both GDBserver, and the in-process |
fa593d66 PA |
33 | agent (IPA), a shared library that includes a tracing agent that is |
34 | loaded by the inferior to support fast tracepoints. Fast | |
35 | tracepoints (or more accurately, jump based tracepoints) are | |
36 | implemented by patching the tracepoint location with a jump into a | |
37 | small trampoline function whose job is to save the register state, | |
38 | call the in-process tracing agent, and then execute the original | |
39 | instruction that was under the tracepoint jump (possibly adjusted, | |
40 | if PC-relative, or some such). | |
41 | ||
42 | The current synchronization design is pull based. That means, | |
43 | GDBserver does most of the work, by peeking/poking at the inferior | |
44 | agent's memory directly for downloading tracepoint and associated | |
45 | objects, and for uploading trace frames. Whenever the IPA needs | |
46 | something from GDBserver (trace buffer is full, tracing stopped for | |
47 | some reason, etc.) the IPA calls a corresponding hook function | |
48 | where GDBserver has placed a breakpoint. | |
49 | ||
50 | Each of the agents has its own trace buffer. When browsing the | |
51 | trace frames built from slow and fast tracepoints from GDB (tfind | |
52 | mode), there's no guarantee the user is seeing the trace frames in | |
53 | strict chronological creation order, although, GDBserver tries to | |
54 | keep the order relatively reasonable, by syncing the trace buffers | |
55 | at appropriate times. | |
56 | ||
57 | */ | |
58 | ||
59 | static void trace_vdebug (const char *, ...) ATTR_FORMAT (printf, 1, 2); | |
219f2f23 PA |
60 | |
61 | static void | |
fa593d66 | 62 | trace_vdebug (const char *fmt, ...) |
219f2f23 PA |
63 | { |
64 | char buf[1024]; | |
65 | va_list ap; | |
66 | ||
67 | va_start (ap, fmt); | |
68 | vsprintf (buf, fmt, ap); | |
5e1dc496 | 69 | fprintf (stderr, PROG "/tracepoint: %s\n", buf); |
219f2f23 PA |
70 | va_end (ap); |
71 | } | |
72 | ||
fa593d66 | 73 | #define trace_debug_1(level, fmt, args...) \ |
219f2f23 | 74 | do { \ |
32d92999 | 75 | if (level <= debug_threads) \ |
fa593d66 | 76 | trace_vdebug ((fmt), ##args); \ |
219f2f23 PA |
77 | } while (0) |
78 | ||
fa593d66 PA |
79 | #define trace_debug(FMT, args...) \ |
80 | trace_debug_1 (1, FMT, ##args) | |
81 | ||
82 | #if defined(__GNUC__) | |
83 | # define ATTR_USED __attribute__((used)) | |
84 | # define ATTR_NOINLINE __attribute__((noinline)) | |
85 | # define ATTR_CONSTRUCTOR __attribute__ ((constructor)) | |
86 | #else | |
87 | # define ATTR_USED | |
88 | # define ATTR_NOINLINE | |
89 | # define ATTR_CONSTRUCTOR | |
90 | #endif | |
91 | ||
92 | /* Make sure the functions the IPA needs to export (symbols GDBserver | |
93 | needs to query GDB about) are exported. */ | |
94 | ||
95 | #ifdef IN_PROCESS_AGENT | |
96 | # if defined _WIN32 || defined __CYGWIN__ | |
97 | # define IP_AGENT_EXPORT __declspec(dllexport) ATTR_USED | |
98 | # else | |
99 | # if __GNUC__ >= 4 | |
100 | # define IP_AGENT_EXPORT \ | |
101 | __attribute__ ((visibility("default"))) ATTR_USED | |
102 | # else | |
103 | # define IP_AGENT_EXPORT ATTR_USED | |
104 | # endif | |
105 | # endif | |
106 | #else | |
107 | # define IP_AGENT_EXPORT | |
108 | #endif | |
109 | ||
110 | /* Prefix exported symbols, for good citizenship. All the symbols | |
111 | that need exporting are defined in this module. */ | |
112 | #ifdef IN_PROCESS_AGENT | |
113 | # define gdb_tp_heap_buffer gdb_agent_gdb_tp_heap_buffer | |
114 | # define gdb_jump_pad_buffer gdb_agent_gdb_jump_pad_buffer | |
115 | # define gdb_jump_pad_buffer_end gdb_agent_gdb_jump_pad_buffer_end | |
405f8e94 SS |
116 | # define gdb_trampoline_buffer gdb_agent_gdb_trampoline_buffer |
117 | # define gdb_trampoline_buffer_end gdb_agent_gdb_trampoline_buffer_end | |
118 | # define gdb_trampoline_buffer_error gdb_agent_gdb_trampoline_buffer_error | |
fa593d66 PA |
119 | # define collecting gdb_agent_collecting |
120 | # define gdb_collect gdb_agent_gdb_collect | |
121 | # define stop_tracing gdb_agent_stop_tracing | |
122 | # define flush_trace_buffer gdb_agent_flush_trace_buffer | |
123 | # define about_to_request_buffer_space gdb_agent_about_to_request_buffer_space | |
124 | # define trace_buffer_is_full gdb_agent_trace_buffer_is_full | |
125 | # define stopping_tracepoint gdb_agent_stopping_tracepoint | |
126 | # define expr_eval_result gdb_agent_expr_eval_result | |
127 | # define error_tracepoint gdb_agent_error_tracepoint | |
128 | # define tracepoints gdb_agent_tracepoints | |
129 | # define tracing gdb_agent_tracing | |
130 | # define trace_buffer_ctrl gdb_agent_trace_buffer_ctrl | |
131 | # define trace_buffer_ctrl_curr gdb_agent_trace_buffer_ctrl_curr | |
132 | # define trace_buffer_lo gdb_agent_trace_buffer_lo | |
133 | # define trace_buffer_hi gdb_agent_trace_buffer_hi | |
134 | # define traceframe_read_count gdb_agent_traceframe_read_count | |
135 | # define traceframe_write_count gdb_agent_traceframe_write_count | |
136 | # define traceframes_created gdb_agent_traceframes_created | |
137 | # define trace_state_variables gdb_agent_trace_state_variables | |
6a271cae | 138 | # define get_raw_reg gdb_agent_get_raw_reg |
493e2a69 MS |
139 | # define get_trace_state_variable_value \ |
140 | gdb_agent_get_trace_state_variable_value | |
141 | # define set_trace_state_variable_value \ | |
142 | gdb_agent_set_trace_state_variable_value | |
0fb4aa4b PA |
143 | # define ust_loaded gdb_agent_ust_loaded |
144 | # define helper_thread_id gdb_agent_helper_thread_id | |
145 | # define cmd_buf gdb_agent_cmd_buf | |
fa593d66 PA |
146 | #endif |
147 | ||
148 | #ifndef IN_PROCESS_AGENT | |
149 | ||
150 | /* Addresses of in-process agent's symbols GDBserver cares about. */ | |
151 | ||
152 | struct ipa_sym_addresses | |
153 | { | |
154 | CORE_ADDR addr_gdb_tp_heap_buffer; | |
155 | CORE_ADDR addr_gdb_jump_pad_buffer; | |
156 | CORE_ADDR addr_gdb_jump_pad_buffer_end; | |
405f8e94 SS |
157 | CORE_ADDR addr_gdb_trampoline_buffer; |
158 | CORE_ADDR addr_gdb_trampoline_buffer_end; | |
159 | CORE_ADDR addr_gdb_trampoline_buffer_error; | |
fa593d66 PA |
160 | CORE_ADDR addr_collecting; |
161 | CORE_ADDR addr_gdb_collect; | |
162 | CORE_ADDR addr_stop_tracing; | |
163 | CORE_ADDR addr_flush_trace_buffer; | |
164 | CORE_ADDR addr_about_to_request_buffer_space; | |
165 | CORE_ADDR addr_trace_buffer_is_full; | |
166 | CORE_ADDR addr_stopping_tracepoint; | |
167 | CORE_ADDR addr_expr_eval_result; | |
168 | CORE_ADDR addr_error_tracepoint; | |
169 | CORE_ADDR addr_tracepoints; | |
170 | CORE_ADDR addr_tracing; | |
171 | CORE_ADDR addr_trace_buffer_ctrl; | |
172 | CORE_ADDR addr_trace_buffer_ctrl_curr; | |
173 | CORE_ADDR addr_trace_buffer_lo; | |
174 | CORE_ADDR addr_trace_buffer_hi; | |
175 | CORE_ADDR addr_traceframe_read_count; | |
176 | CORE_ADDR addr_traceframe_write_count; | |
177 | CORE_ADDR addr_traceframes_created; | |
178 | CORE_ADDR addr_trace_state_variables; | |
6a271cae PA |
179 | CORE_ADDR addr_get_raw_reg; |
180 | CORE_ADDR addr_get_trace_state_variable_value; | |
181 | CORE_ADDR addr_set_trace_state_variable_value; | |
0fb4aa4b | 182 | CORE_ADDR addr_ust_loaded; |
fa593d66 PA |
183 | }; |
184 | ||
fa593d66 PA |
185 | static struct |
186 | { | |
187 | const char *name; | |
188 | int offset; | |
189 | int required; | |
190 | } symbol_list[] = { | |
191 | IPA_SYM(gdb_tp_heap_buffer), | |
192 | IPA_SYM(gdb_jump_pad_buffer), | |
193 | IPA_SYM(gdb_jump_pad_buffer_end), | |
405f8e94 SS |
194 | IPA_SYM(gdb_trampoline_buffer), |
195 | IPA_SYM(gdb_trampoline_buffer_end), | |
196 | IPA_SYM(gdb_trampoline_buffer_error), | |
fa593d66 PA |
197 | IPA_SYM(collecting), |
198 | IPA_SYM(gdb_collect), | |
199 | IPA_SYM(stop_tracing), | |
200 | IPA_SYM(flush_trace_buffer), | |
201 | IPA_SYM(about_to_request_buffer_space), | |
202 | IPA_SYM(trace_buffer_is_full), | |
203 | IPA_SYM(stopping_tracepoint), | |
204 | IPA_SYM(expr_eval_result), | |
205 | IPA_SYM(error_tracepoint), | |
206 | IPA_SYM(tracepoints), | |
207 | IPA_SYM(tracing), | |
208 | IPA_SYM(trace_buffer_ctrl), | |
209 | IPA_SYM(trace_buffer_ctrl_curr), | |
210 | IPA_SYM(trace_buffer_lo), | |
211 | IPA_SYM(trace_buffer_hi), | |
212 | IPA_SYM(traceframe_read_count), | |
213 | IPA_SYM(traceframe_write_count), | |
214 | IPA_SYM(traceframes_created), | |
215 | IPA_SYM(trace_state_variables), | |
6a271cae PA |
216 | IPA_SYM(get_raw_reg), |
217 | IPA_SYM(get_trace_state_variable_value), | |
218 | IPA_SYM(set_trace_state_variable_value), | |
0fb4aa4b | 219 | IPA_SYM(ust_loaded), |
fa593d66 PA |
220 | }; |
221 | ||
2fa291ac | 222 | static struct ipa_sym_addresses ipa_sym_addrs; |
fa593d66 | 223 | |
fa593d66 PA |
224 | static int read_inferior_integer (CORE_ADDR symaddr, int *val); |
225 | ||
0fb4aa4b | 226 | /* Returns true if both the in-process agent library and the static |
8ffcbaaf YQ |
227 | tracepoints libraries are loaded in the inferior, and agent has |
228 | capability on static tracepoints. */ | |
0fb4aa4b PA |
229 | |
230 | static int | |
8ffcbaaf | 231 | in_process_agent_supports_ust (void) |
0fb4aa4b PA |
232 | { |
233 | int loaded = 0; | |
234 | ||
58b4daa5 | 235 | if (!agent_loaded_p ()) |
0fb4aa4b PA |
236 | { |
237 | warning ("In-process agent not loaded"); | |
238 | return 0; | |
239 | } | |
240 | ||
8ffcbaaf | 241 | if (agent_capability_check (AGENT_CAPA_STATIC_TRACE)) |
0fb4aa4b | 242 | { |
8ffcbaaf YQ |
243 | /* Agent understands static tracepoint, then check whether UST is in |
244 | fact loaded in the inferior. */ | |
245 | if (read_inferior_integer (ipa_sym_addrs.addr_ust_loaded, &loaded)) | |
246 | { | |
247 | warning ("Error reading ust_loaded in lib"); | |
248 | return 0; | |
249 | } | |
0fb4aa4b | 250 | |
8ffcbaaf YQ |
251 | return loaded; |
252 | } | |
253 | else | |
254 | return 0; | |
0fb4aa4b PA |
255 | } |
256 | ||
fa593d66 PA |
257 | static void |
258 | write_e_ipa_not_loaded (char *buffer) | |
259 | { | |
260 | sprintf (buffer, | |
261 | "E.In-process agent library not loaded in process. " | |
0fb4aa4b PA |
262 | "Fast and static tracepoints unavailable."); |
263 | } | |
264 | ||
265 | /* Write an error to BUFFER indicating that UST isn't loaded in the | |
266 | inferior. */ | |
267 | ||
268 | static void | |
269 | write_e_ust_not_loaded (char *buffer) | |
270 | { | |
271 | #ifdef HAVE_UST | |
272 | sprintf (buffer, | |
273 | "E.UST library not loaded in process. " | |
274 | "Static tracepoints unavailable."); | |
275 | #else | |
276 | sprintf (buffer, "E.GDBserver was built without static tracepoints support"); | |
277 | #endif | |
fa593d66 PA |
278 | } |
279 | ||
0fb4aa4b PA |
280 | /* If the in-process agent library isn't loaded in the inferior, write |
281 | an error to BUFFER, and return 1. Otherwise, return 0. */ | |
282 | ||
fa593d66 PA |
283 | static int |
284 | maybe_write_ipa_not_loaded (char *buffer) | |
285 | { | |
58b4daa5 | 286 | if (!agent_loaded_p ()) |
fa593d66 PA |
287 | { |
288 | write_e_ipa_not_loaded (buffer); | |
289 | return 1; | |
290 | } | |
291 | return 0; | |
292 | } | |
293 | ||
0fb4aa4b PA |
294 | /* If the in-process agent library and the ust (static tracepoints) |
295 | library aren't loaded in the inferior, write an error to BUFFER, | |
296 | and return 1. Otherwise, return 0. */ | |
297 | ||
298 | static int | |
299 | maybe_write_ipa_ust_not_loaded (char *buffer) | |
300 | { | |
58b4daa5 | 301 | if (!agent_loaded_p ()) |
0fb4aa4b PA |
302 | { |
303 | write_e_ipa_not_loaded (buffer); | |
304 | return 1; | |
305 | } | |
8ffcbaaf | 306 | else if (!in_process_agent_supports_ust ()) |
0fb4aa4b PA |
307 | { |
308 | write_e_ust_not_loaded (buffer); | |
309 | return 1; | |
310 | } | |
311 | return 0; | |
312 | } | |
313 | ||
fa593d66 PA |
314 | /* Cache all future symbols that the tracepoints module might request. |
315 | We can not request symbols at arbitrary states in the remote | |
316 | protocol, only when the client tells us that new symbols are | |
317 | available. So when we load the in-process library, make sure to | |
318 | check the entire list. */ | |
319 | ||
320 | void | |
321 | tracepoint_look_up_symbols (void) | |
322 | { | |
fa593d66 PA |
323 | int i; |
324 | ||
58b4daa5 | 325 | if (agent_loaded_p ()) |
fa593d66 PA |
326 | return; |
327 | ||
fa593d66 PA |
328 | for (i = 0; i < sizeof (symbol_list) / sizeof (symbol_list[0]); i++) |
329 | { | |
330 | CORE_ADDR *addrp = | |
331 | (CORE_ADDR *) ((char *) &ipa_sym_addrs + symbol_list[i].offset); | |
332 | ||
333 | if (look_up_one_symbol (symbol_list[i].name, addrp, 1) == 0) | |
334 | { | |
335 | if (debug_threads) | |
336 | fprintf (stderr, "symbol `%s' not found\n", symbol_list[i].name); | |
2275a1a7 | 337 | return; |
fa593d66 PA |
338 | } |
339 | } | |
340 | ||
5808517f | 341 | agent_look_up_symbols (NULL); |
fa593d66 PA |
342 | } |
343 | ||
344 | #endif | |
345 | ||
346 | /* GDBserver places a breakpoint on the IPA's version (which is a nop) | |
347 | of the "stop_tracing" function. When this breakpoint is hit, | |
348 | tracing stopped in the IPA for some reason. E.g., due to | |
349 | tracepoint reaching the pass count, hitting conditional expression | |
350 | evaluation error, etc. | |
351 | ||
352 | The IPA's trace buffer is never in circular tracing mode: instead, | |
353 | GDBserver's is, and whenever the in-process buffer fills, it calls | |
354 | "flush_trace_buffer", which triggers an internal breakpoint. | |
355 | GDBserver reacts to this breakpoint by pulling the meanwhile | |
356 | collected data. Old frames discarding is always handled on the | |
357 | GDBserver side. */ | |
358 | ||
359 | #ifdef IN_PROCESS_AGENT | |
fa593d66 PA |
360 | int |
361 | read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) | |
362 | { | |
363 | memcpy (myaddr, (void *) (uintptr_t) memaddr, len); | |
364 | return 0; | |
365 | } | |
366 | ||
367 | /* Call this in the functions where GDBserver places a breakpoint, so | |
368 | that the compiler doesn't try to be clever and skip calling the | |
369 | function at all. This is necessary, even if we tell the compiler | |
370 | to not inline said functions. */ | |
371 | ||
372 | #if defined(__GNUC__) | |
373 | # define UNKNOWN_SIDE_EFFECTS() asm ("") | |
374 | #else | |
375 | # define UNKNOWN_SIDE_EFFECTS() do {} while (0) | |
376 | #endif | |
377 | ||
378 | IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE | |
379 | stop_tracing (void) | |
380 | { | |
381 | /* GDBserver places breakpoint here. */ | |
382 | UNKNOWN_SIDE_EFFECTS(); | |
383 | } | |
384 | ||
385 | IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE | |
386 | flush_trace_buffer (void) | |
387 | { | |
388 | /* GDBserver places breakpoint here. */ | |
389 | UNKNOWN_SIDE_EFFECTS(); | |
390 | } | |
391 | ||
392 | #endif | |
393 | ||
394 | #ifndef IN_PROCESS_AGENT | |
219f2f23 PA |
395 | static int |
396 | tracepoint_handler (CORE_ADDR address) | |
397 | { | |
398 | trace_debug ("tracepoint_handler: tracepoint at 0x%s hit", | |
399 | paddress (address)); | |
400 | return 0; | |
401 | } | |
402 | ||
fa593d66 PA |
403 | /* Breakpoint at "stop_tracing" in the inferior lib. */ |
404 | struct breakpoint *stop_tracing_bkpt; | |
405 | static int stop_tracing_handler (CORE_ADDR); | |
406 | ||
407 | /* Breakpoint at "flush_trace_buffer" in the inferior lib. */ | |
408 | struct breakpoint *flush_trace_buffer_bkpt; | |
409 | static int flush_trace_buffer_handler (CORE_ADDR); | |
410 | ||
fa593d66 PA |
411 | static void download_trace_state_variables (void); |
412 | static void upload_fast_traceframes (void); | |
413 | ||
42476b70 | 414 | static int run_inferior_command (char *cmd, int len); |
0fb4aa4b | 415 | |
fa593d66 PA |
416 | static int |
417 | read_inferior_integer (CORE_ADDR symaddr, int *val) | |
418 | { | |
419 | return read_inferior_memory (symaddr, (unsigned char *) val, | |
420 | sizeof (*val)); | |
421 | } | |
422 | ||
42476b70 YQ |
423 | struct tracepoint; |
424 | static int tracepoint_send_agent (struct tracepoint *tpoint); | |
425 | ||
fa593d66 PA |
426 | static int |
427 | read_inferior_uinteger (CORE_ADDR symaddr, unsigned int *val) | |
428 | { | |
429 | return read_inferior_memory (symaddr, (unsigned char *) val, | |
430 | sizeof (*val)); | |
431 | } | |
432 | ||
433 | static int | |
434 | read_inferior_data_pointer (CORE_ADDR symaddr, CORE_ADDR *val) | |
435 | { | |
436 | void *pval = (void *) (uintptr_t) val; | |
437 | int ret; | |
438 | ||
439 | ret = read_inferior_memory (symaddr, (unsigned char *) &pval, sizeof (pval)); | |
440 | *val = (uintptr_t) pval; | |
441 | return ret; | |
442 | } | |
443 | ||
444 | static int | |
445 | write_inferior_data_pointer (CORE_ADDR symaddr, CORE_ADDR val) | |
446 | { | |
447 | void *pval = (void *) (uintptr_t) val; | |
448 | return write_inferior_memory (symaddr, | |
449 | (unsigned char *) &pval, sizeof (pval)); | |
450 | } | |
451 | ||
452 | static int | |
453 | write_inferior_integer (CORE_ADDR symaddr, int val) | |
454 | { | |
455 | return write_inferior_memory (symaddr, (unsigned char *) &val, sizeof (val)); | |
456 | } | |
457 | ||
458 | static int | |
459 | write_inferior_uinteger (CORE_ADDR symaddr, unsigned int val) | |
460 | { | |
461 | return write_inferior_memory (symaddr, (unsigned char *) &val, sizeof (val)); | |
462 | } | |
463 | ||
8d0d92cd YQ |
464 | static CORE_ADDR target_malloc (ULONGEST size); |
465 | static int write_inferior_data_ptr (CORE_ADDR where, CORE_ADDR ptr); | |
42476b70 YQ |
466 | |
467 | #define COPY_FIELD_TO_BUF(BUF, OBJ, FIELD) \ | |
468 | do { \ | |
469 | memcpy (BUF, &(OBJ)->FIELD, sizeof ((OBJ)->FIELD)); \ | |
470 | BUF += sizeof ((OBJ)->FIELD); \ | |
471 | } while (0) | |
472 | ||
fa593d66 PA |
473 | #endif |
474 | ||
8d0d92cd YQ |
475 | /* Operations on various types of tracepoint actions. */ |
476 | ||
477 | struct tracepoint_action; | |
478 | ||
479 | struct tracepoint_action_ops | |
480 | { | |
481 | /* Download tracepoint action ACTION to IPA. Return the address of action | |
482 | in IPA/inferior. */ | |
483 | CORE_ADDR (*download) (const struct tracepoint_action *action); | |
42476b70 YQ |
484 | |
485 | /* Send ACTION to agent via command buffer started from BUFFER. Return | |
486 | updated head of command buffer. */ | |
487 | char* (*send) (char *buffer, const struct tracepoint_action *action); | |
8d0d92cd YQ |
488 | }; |
489 | ||
219f2f23 PA |
490 | /* Base action. Concrete actions inherit this. */ |
491 | ||
492 | struct tracepoint_action | |
493 | { | |
8d0d92cd YQ |
494 | #ifndef IN_PROCESS_AGENT |
495 | const struct tracepoint_action_ops *ops; | |
496 | #endif | |
219f2f23 PA |
497 | char type; |
498 | }; | |
499 | ||
500 | /* An 'M' (collect memory) action. */ | |
501 | struct collect_memory_action | |
502 | { | |
503 | struct tracepoint_action base; | |
504 | ||
505 | ULONGEST addr; | |
506 | ULONGEST len; | |
5f18041e | 507 | int32_t basereg; |
219f2f23 PA |
508 | }; |
509 | ||
510 | /* An 'R' (collect registers) action. */ | |
511 | ||
512 | struct collect_registers_action | |
513 | { | |
514 | struct tracepoint_action base; | |
515 | }; | |
516 | ||
517 | /* An 'X' (evaluate expression) action. */ | |
518 | ||
519 | struct eval_expr_action | |
520 | { | |
521 | struct tracepoint_action base; | |
522 | ||
523 | struct agent_expr *expr; | |
524 | }; | |
525 | ||
0fb4aa4b PA |
526 | /* An 'L' (collect static trace data) action. */ |
527 | struct collect_static_trace_data_action | |
528 | { | |
529 | struct tracepoint_action base; | |
530 | }; | |
531 | ||
8d0d92cd YQ |
532 | #ifndef IN_PROCESS_AGENT |
533 | static CORE_ADDR | |
534 | m_tracepoint_action_download (const struct tracepoint_action *action) | |
535 | { | |
536 | int size_in_ipa = (sizeof (struct collect_memory_action) | |
537 | - offsetof (struct tracepoint_action, type)); | |
538 | CORE_ADDR ipa_action = target_malloc (size_in_ipa); | |
539 | ||
540 | write_inferior_memory (ipa_action, (unsigned char *) &action->type, | |
541 | size_in_ipa); | |
542 | ||
543 | return ipa_action; | |
544 | } | |
42476b70 YQ |
545 | static char * |
546 | m_tracepoint_action_send (char *buffer, const struct tracepoint_action *action) | |
547 | { | |
548 | struct collect_memory_action *maction | |
549 | = (struct collect_memory_action *) action; | |
550 | ||
551 | COPY_FIELD_TO_BUF (buffer, maction, addr); | |
552 | COPY_FIELD_TO_BUF (buffer, maction, len); | |
553 | COPY_FIELD_TO_BUF (buffer, maction, basereg); | |
554 | ||
555 | return buffer; | |
556 | } | |
8d0d92cd YQ |
557 | |
558 | static const struct tracepoint_action_ops m_tracepoint_action_ops = | |
559 | { | |
560 | m_tracepoint_action_download, | |
42476b70 | 561 | m_tracepoint_action_send, |
8d0d92cd YQ |
562 | }; |
563 | ||
564 | static CORE_ADDR | |
565 | r_tracepoint_action_download (const struct tracepoint_action *action) | |
566 | { | |
567 | int size_in_ipa = (sizeof (struct collect_registers_action) | |
568 | - offsetof (struct tracepoint_action, type)); | |
569 | CORE_ADDR ipa_action = target_malloc (size_in_ipa); | |
570 | ||
571 | write_inferior_memory (ipa_action, (unsigned char *) &action->type, | |
572 | size_in_ipa); | |
573 | ||
574 | return ipa_action; | |
575 | } | |
576 | ||
42476b70 YQ |
577 | static char * |
578 | r_tracepoint_action_send (char *buffer, const struct tracepoint_action *action) | |
579 | { | |
580 | return buffer; | |
581 | } | |
582 | ||
8d0d92cd YQ |
583 | static const struct tracepoint_action_ops r_tracepoint_action_ops = |
584 | { | |
585 | r_tracepoint_action_download, | |
42476b70 | 586 | r_tracepoint_action_send, |
8d0d92cd YQ |
587 | }; |
588 | ||
589 | static CORE_ADDR download_agent_expr (struct agent_expr *expr); | |
590 | ||
591 | static CORE_ADDR | |
592 | x_tracepoint_action_download (const struct tracepoint_action *action) | |
593 | { | |
594 | int size_in_ipa = (sizeof (struct eval_expr_action) | |
595 | - offsetof (struct tracepoint_action, type)); | |
596 | CORE_ADDR ipa_action = target_malloc (size_in_ipa); | |
597 | CORE_ADDR expr; | |
598 | ||
599 | write_inferior_memory (ipa_action, (unsigned char *) &action->type, | |
600 | size_in_ipa); | |
601 | expr = download_agent_expr (((struct eval_expr_action *)action)->expr); | |
602 | write_inferior_data_ptr (ipa_action + offsetof (struct eval_expr_action, expr) | |
603 | - offsetof (struct tracepoint_action, type), | |
604 | expr); | |
605 | ||
606 | return ipa_action; | |
607 | } | |
608 | ||
42476b70 YQ |
609 | /* Copy agent expression AEXPR to buffer pointed by P. If AEXPR is NULL, |
610 | copy 0 to P. Return updated header of buffer. */ | |
611 | ||
612 | static char * | |
613 | agent_expr_send (char *p, const struct agent_expr *aexpr) | |
614 | { | |
615 | /* Copy the length of condition first, and then copy its | |
616 | content. */ | |
617 | if (aexpr == NULL) | |
618 | { | |
619 | memset (p, 0, 4); | |
620 | p += 4; | |
621 | } | |
622 | else | |
623 | { | |
624 | memcpy (p, &aexpr->length, 4); | |
625 | p +=4; | |
626 | ||
627 | memcpy (p, aexpr->bytes, aexpr->length); | |
628 | p += aexpr->length; | |
629 | } | |
630 | return p; | |
631 | } | |
632 | ||
633 | static char * | |
634 | x_tracepoint_action_send ( char *buffer, const struct tracepoint_action *action) | |
635 | { | |
636 | struct eval_expr_action *eaction = (struct eval_expr_action *) action; | |
637 | ||
638 | return agent_expr_send (buffer, eaction->expr); | |
639 | } | |
640 | ||
8d0d92cd YQ |
641 | static const struct tracepoint_action_ops x_tracepoint_action_ops = |
642 | { | |
643 | x_tracepoint_action_download, | |
42476b70 | 644 | x_tracepoint_action_send, |
8d0d92cd YQ |
645 | }; |
646 | ||
647 | static CORE_ADDR | |
648 | l_tracepoint_action_download (const struct tracepoint_action *action) | |
649 | { | |
650 | int size_in_ipa = (sizeof (struct collect_static_trace_data_action) | |
651 | - offsetof (struct tracepoint_action, type)); | |
652 | CORE_ADDR ipa_action = target_malloc (size_in_ipa); | |
653 | ||
654 | write_inferior_memory (ipa_action, (unsigned char *) &action->type, | |
655 | size_in_ipa); | |
656 | ||
657 | return ipa_action; | |
658 | } | |
659 | ||
42476b70 YQ |
660 | static char * |
661 | l_tracepoint_action_send (char *buffer, const struct tracepoint_action *action) | |
662 | { | |
663 | return buffer; | |
664 | } | |
665 | ||
8d0d92cd YQ |
666 | static const struct tracepoint_action_ops l_tracepoint_action_ops = |
667 | { | |
668 | l_tracepoint_action_download, | |
42476b70 | 669 | l_tracepoint_action_send, |
8d0d92cd YQ |
670 | }; |
671 | #endif | |
672 | ||
219f2f23 PA |
673 | /* This structure describes a piece of the source-level definition of |
674 | the tracepoint. The contents are not interpreted by the target, | |
675 | but preserved verbatim for uploading upon reconnection. */ | |
676 | ||
677 | struct source_string | |
678 | { | |
679 | /* The type of string, such as "cond" for a conditional. */ | |
680 | char *type; | |
681 | ||
682 | /* The source-level string itself. For the sake of target | |
683 | debugging, we store it in plaintext, even though it is always | |
684 | transmitted in hex. */ | |
685 | char *str; | |
686 | ||
687 | /* Link to the next one in the list. We link them in the order | |
688 | received, in case some make up an ordered list of commands or | |
689 | some such. */ | |
690 | struct source_string *next; | |
691 | }; | |
692 | ||
fa593d66 PA |
693 | enum tracepoint_type |
694 | { | |
695 | /* Trap based tracepoint. */ | |
696 | trap_tracepoint, | |
697 | ||
698 | /* A fast tracepoint implemented with a jump instead of a trap. */ | |
699 | fast_tracepoint, | |
0fb4aa4b PA |
700 | |
701 | /* A static tracepoint, implemented by a program call into a tracing | |
702 | library. */ | |
703 | static_tracepoint | |
fa593d66 PA |
704 | }; |
705 | ||
219f2f23 PA |
706 | struct tracepoint_hit_ctx; |
707 | ||
6a271cae PA |
708 | typedef enum eval_result_type (*condfn) (struct tracepoint_hit_ctx *, |
709 | ULONGEST *); | |
710 | ||
219f2f23 PA |
711 | /* The definition of a tracepoint. */ |
712 | ||
713 | /* Tracepoints may have multiple locations, each at a different | |
714 | address. This can occur with optimizations, template | |
715 | instantiation, etc. Since the locations may be in different | |
716 | scopes, the conditions and actions may be different for each | |
717 | location. Our target version of tracepoints is more like GDB's | |
718 | notion of "breakpoint locations", but we have almost nothing that | |
719 | is not per-location, so we bother having two kinds of objects. The | |
720 | key consequence is that numbers are not unique, and that it takes | |
721 | both number and address to identify a tracepoint uniquely. */ | |
722 | ||
723 | struct tracepoint | |
724 | { | |
725 | /* The number of the tracepoint, as specified by GDB. Several | |
726 | tracepoint objects here may share a number. */ | |
5f18041e | 727 | uint32_t number; |
219f2f23 PA |
728 | |
729 | /* Address at which the tracepoint is supposed to trigger. Several | |
730 | tracepoints may share an address. */ | |
731 | CORE_ADDR address; | |
732 | ||
fa593d66 PA |
733 | /* Tracepoint type. */ |
734 | enum tracepoint_type type; | |
735 | ||
219f2f23 | 736 | /* True if the tracepoint is currently enabled. */ |
5f18041e | 737 | int8_t enabled; |
219f2f23 PA |
738 | |
739 | /* The number of single steps that will be performed after each | |
740 | tracepoint hit. */ | |
5f18041e | 741 | uint64_t step_count; |
219f2f23 PA |
742 | |
743 | /* The number of times the tracepoint may be hit before it will | |
744 | terminate the entire tracing run. */ | |
5f18041e | 745 | uint64_t pass_count; |
219f2f23 PA |
746 | |
747 | /* Pointer to the agent expression that is the tracepoint's | |
748 | conditional, or NULL if the tracepoint is unconditional. */ | |
749 | struct agent_expr *cond; | |
750 | ||
751 | /* The list of actions to take when the tracepoint triggers. */ | |
5f18041e | 752 | uint32_t numactions; |
219f2f23 | 753 | struct tracepoint_action **actions; |
219f2f23 PA |
754 | |
755 | /* Count of the times we've hit this tracepoint during the run. | |
756 | Note that while-stepping steps are not counted as "hits". */ | |
5f18041e | 757 | uint64_t hit_count; |
219f2f23 | 758 | |
f196051f | 759 | /* Cached sum of the sizes of traceframes created by this point. */ |
5f18041e | 760 | uint64_t traceframe_usage; |
f196051f | 761 | |
6a271cae PA |
762 | CORE_ADDR compiled_cond; |
763 | ||
fa593d66 PA |
764 | /* Link to the next tracepoint in the list. */ |
765 | struct tracepoint *next; | |
766 | ||
767 | #ifndef IN_PROCESS_AGENT | |
768 | /* The list of actions to take when the tracepoint triggers, in | |
769 | string/packet form. */ | |
770 | char **actions_str; | |
771 | ||
219f2f23 PA |
772 | /* The collection of strings that describe the tracepoint as it was |
773 | entered into GDB. These are not used by the target, but are | |
774 | reported back to GDB upon reconnection. */ | |
775 | struct source_string *source_strings; | |
776 | ||
fa593d66 PA |
777 | /* The number of bytes displaced by fast tracepoints. It may subsume |
778 | multiple instructions, for multi-byte fast tracepoints. This | |
779 | field is only valid for fast tracepoints. */ | |
5f18041e | 780 | uint32_t orig_size; |
fa593d66 PA |
781 | |
782 | /* Only for fast tracepoints. */ | |
783 | CORE_ADDR obj_addr_on_target; | |
784 | ||
785 | /* Address range where the original instruction under a fast | |
786 | tracepoint was relocated to. (_end is actually one byte past | |
787 | the end). */ | |
788 | CORE_ADDR adjusted_insn_addr; | |
789 | CORE_ADDR adjusted_insn_addr_end; | |
790 | ||
791 | /* The address range of the piece of the jump pad buffer that was | |
792 | assigned to this fast tracepoint. (_end is actually one byte | |
793 | past the end).*/ | |
794 | CORE_ADDR jump_pad; | |
795 | CORE_ADDR jump_pad_end; | |
796 | ||
405f8e94 SS |
797 | /* The address range of the piece of the trampoline buffer that was |
798 | assigned to this fast tracepoint. (_end is actually one byte | |
799 | past the end). */ | |
800 | CORE_ADDR trampoline; | |
801 | CORE_ADDR trampoline_end; | |
802 | ||
fa593d66 PA |
803 | /* The list of actions to take while in a stepping loop. These |
804 | fields are only valid for patch-based tracepoints. */ | |
805 | int num_step_actions; | |
806 | struct tracepoint_action **step_actions; | |
807 | /* Same, but in string/packet form. */ | |
808 | char **step_actions_str; | |
809 | ||
810 | /* Handle returned by the breakpoint or tracepoint module when we | |
0fb4aa4b PA |
811 | inserted the trap or jump, or hooked into a static tracepoint. |
812 | NULL if we haven't inserted it yet. */ | |
219f2f23 | 813 | void *handle; |
fa593d66 | 814 | #endif |
219f2f23 | 815 | |
219f2f23 PA |
816 | }; |
817 | ||
fa593d66 PA |
818 | #ifndef IN_PROCESS_AGENT |
819 | ||
219f2f23 PA |
820 | /* Given `while-stepping', a thread may be collecting data for more |
821 | than one tracepoint simultaneously. On the other hand, the same | |
822 | tracepoint with a while-stepping action may be hit by more than one | |
823 | thread simultaneously (but not quite, each thread could be handling | |
824 | a different step). Each thread holds a list of these objects, | |
825 | representing the current step of each while-stepping action being | |
826 | collected. */ | |
827 | ||
828 | struct wstep_state | |
829 | { | |
830 | struct wstep_state *next; | |
831 | ||
832 | /* The tracepoint number. */ | |
833 | int tp_number; | |
834 | /* The tracepoint's address. */ | |
835 | CORE_ADDR tp_address; | |
836 | ||
837 | /* The number of the current step in this 'while-stepping' | |
838 | action. */ | |
839 | long current_step; | |
840 | }; | |
841 | ||
fa593d66 PA |
842 | #endif |
843 | ||
844 | /* The linked list of all tracepoints. Marked explicitly as used as | |
845 | the in-process library doesn't use it for the fast tracepoints | |
846 | support. */ | |
847 | IP_AGENT_EXPORT struct tracepoint *tracepoints ATTR_USED; | |
219f2f23 | 848 | |
fa593d66 | 849 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
850 | |
851 | /* Pointer to the last tracepoint in the list, new tracepoints are | |
852 | linked in at the end. */ | |
853 | ||
854 | static struct tracepoint *last_tracepoint; | |
fa593d66 | 855 | #endif |
219f2f23 PA |
856 | |
857 | /* The first tracepoint to exceed its pass count. */ | |
858 | ||
fa593d66 | 859 | IP_AGENT_EXPORT struct tracepoint *stopping_tracepoint; |
219f2f23 PA |
860 | |
861 | /* True if the trace buffer is full or otherwise no longer usable. */ | |
862 | ||
fa593d66 | 863 | IP_AGENT_EXPORT int trace_buffer_is_full; |
219f2f23 | 864 | |
219f2f23 PA |
865 | static enum eval_result_type expr_eval_result = expr_eval_no_error; |
866 | ||
fa593d66 PA |
867 | #ifndef IN_PROCESS_AGENT |
868 | ||
219f2f23 PA |
869 | static const char *eval_result_names[] = |
870 | { | |
871 | "terror:in the attic", /* this should never be reported */ | |
872 | "terror:empty expression", | |
873 | "terror:empty stack", | |
874 | "terror:stack overflow", | |
875 | "terror:stack underflow", | |
876 | "terror:unhandled opcode", | |
877 | "terror:unrecognized opcode", | |
878 | "terror:divide by zero" | |
879 | }; | |
880 | ||
fa593d66 PA |
881 | #endif |
882 | ||
219f2f23 PA |
883 | /* The tracepoint in which the error occurred. */ |
884 | ||
885 | static struct tracepoint *error_tracepoint; | |
886 | ||
887 | struct trace_state_variable | |
888 | { | |
889 | /* This is the name of the variable as used in GDB. The target | |
890 | doesn't use the name, but needs to have it for saving and | |
891 | reconnection purposes. */ | |
892 | char *name; | |
893 | ||
894 | /* This number identifies the variable uniquely. Numbers may be | |
895 | assigned either by the target (in the case of builtin variables), | |
896 | or by GDB, and are presumed unique during the course of a trace | |
897 | experiment. */ | |
898 | int number; | |
899 | ||
900 | /* The variable's initial value, a 64-bit signed integer always. */ | |
901 | LONGEST initial_value; | |
902 | ||
903 | /* The variable's value, a 64-bit signed integer always. */ | |
904 | LONGEST value; | |
905 | ||
906 | /* Pointer to a getter function, used to supply computed values. */ | |
907 | LONGEST (*getter) (void); | |
908 | ||
909 | /* Link to the next variable. */ | |
910 | struct trace_state_variable *next; | |
911 | }; | |
912 | ||
913 | /* Linked list of all trace state variables. */ | |
914 | ||
fa593d66 PA |
915 | #ifdef IN_PROCESS_AGENT |
916 | struct trace_state_variable *alloced_trace_state_variables; | |
917 | #endif | |
918 | ||
919 | IP_AGENT_EXPORT struct trace_state_variable *trace_state_variables; | |
219f2f23 PA |
920 | |
921 | /* The results of tracing go into a fixed-size space known as the | |
922 | "trace buffer". Because usage follows a limited number of | |
923 | patterns, we manage it ourselves rather than with malloc. Basic | |
924 | rules are that we create only one trace frame at a time, each is | |
925 | variable in size, they are never moved once created, and we only | |
926 | discard if we are doing a circular buffer, and then only the oldest | |
927 | ones. Each trace frame includes its own size, so we don't need to | |
928 | link them together, and the trace frame number is relative to the | |
929 | first one, so we don't need to record numbers. A trace frame also | |
930 | records the number of the tracepoint that created it. The data | |
931 | itself is a series of blocks, each introduced by a single character | |
932 | and with a defined format. Each type of block has enough | |
933 | type/length info to allow scanners to jump quickly from one block | |
934 | to the next without reading each byte in the block. */ | |
935 | ||
936 | /* Trace buffer management would be simple - advance a free pointer | |
937 | from beginning to end, then stop - were it not for the circular | |
938 | buffer option, which is a useful way to prevent a trace run from | |
939 | stopping prematurely because the buffer filled up. In the circular | |
940 | case, the location of the first trace frame (trace_buffer_start) | |
941 | moves as old trace frames are discarded. Also, since we grow trace | |
942 | frames incrementally as actions are performed, we wrap around to | |
943 | the beginning of the trace buffer. This is per-block, so each | |
944 | block within a trace frame remains contiguous. Things get messy | |
945 | when the wrapped-around trace frame is the one being discarded; the | |
946 | free space ends up in two parts at opposite ends of the buffer. */ | |
947 | ||
948 | #ifndef ATTR_PACKED | |
949 | # if defined(__GNUC__) | |
950 | # define ATTR_PACKED __attribute__ ((packed)) | |
951 | # else | |
952 | # define ATTR_PACKED /* nothing */ | |
953 | # endif | |
954 | #endif | |
955 | ||
956 | /* The data collected at a tracepoint hit. This object should be as | |
957 | small as possible, since there may be a great many of them. We do | |
958 | not need to keep a frame number, because they are all sequential | |
959 | and there are no deletions; so the Nth frame in the buffer is | |
960 | always frame number N. */ | |
961 | ||
962 | struct traceframe | |
963 | { | |
964 | /* Number of the tracepoint that collected this traceframe. A value | |
965 | of 0 indicates the current end of the trace buffer. We make this | |
966 | a 16-bit field because it's never going to happen that GDB's | |
967 | numbering of tracepoints reaches 32,000. */ | |
968 | int tpnum : 16; | |
969 | ||
970 | /* The size of the data in this trace frame. We limit this to 32 | |
971 | bits, even on a 64-bit target, because it's just implausible that | |
972 | one is validly going to collect 4 gigabytes of data at a single | |
973 | tracepoint hit. */ | |
974 | unsigned int data_size : 32; | |
975 | ||
976 | /* The base of the trace data, which is contiguous from this point. */ | |
977 | unsigned char data[0]; | |
978 | ||
fa593d66 | 979 | } ATTR_PACKED; |
219f2f23 PA |
980 | |
981 | /* The traceframe to be used as the source of data to send back to | |
982 | GDB. A value of -1 means to get data from the live program. */ | |
983 | ||
984 | int current_traceframe = -1; | |
985 | ||
986 | /* This flag is true if the trace buffer is circular, meaning that | |
987 | when it fills, the oldest trace frames are discarded in order to | |
988 | make room. */ | |
989 | ||
fa593d66 | 990 | #ifndef IN_PROCESS_AGENT |
219f2f23 | 991 | static int circular_trace_buffer; |
fa593d66 | 992 | #endif |
219f2f23 PA |
993 | |
994 | /* Pointer to the block of memory that traceframes all go into. */ | |
995 | ||
996 | static unsigned char *trace_buffer_lo; | |
997 | ||
998 | /* Pointer to the end of the trace buffer, more precisely to the byte | |
999 | after the end of the buffer. */ | |
1000 | ||
1001 | static unsigned char *trace_buffer_hi; | |
1002 | ||
fa593d66 PA |
1003 | /* Control structure holding the read/write/etc. pointers into the |
1004 | trace buffer. We need more than one of these to implement a | |
1005 | transaction-like mechanism to garantees that both GDBserver and the | |
1006 | in-process agent can try to change the trace buffer | |
1007 | simultaneously. */ | |
1008 | ||
1009 | struct trace_buffer_control | |
1010 | { | |
1011 | /* Pointer to the first trace frame in the buffer. In the | |
1012 | non-circular case, this is equal to trace_buffer_lo, otherwise it | |
1013 | moves around in the buffer. */ | |
1014 | unsigned char *start; | |
1015 | ||
1016 | /* Pointer to the free part of the trace buffer. Note that we clear | |
1017 | several bytes at and after this pointer, so that traceframe | |
1018 | scans/searches terminate properly. */ | |
1019 | unsigned char *free; | |
1020 | ||
1021 | /* Pointer to the byte after the end of the free part. Note that | |
1022 | this may be smaller than trace_buffer_free in the circular case, | |
1023 | and means that the free part is in two pieces. Initially it is | |
1024 | equal to trace_buffer_hi, then is generally equivalent to | |
1025 | trace_buffer_start. */ | |
1026 | unsigned char *end_free; | |
1027 | ||
1028 | /* Pointer to the wraparound. If not equal to trace_buffer_hi, then | |
1029 | this is the point at which the trace data breaks, and resumes at | |
1030 | trace_buffer_lo. */ | |
1031 | unsigned char *wrap; | |
1032 | }; | |
1033 | ||
1034 | /* Same as above, to be used by GDBserver when updating the in-process | |
1035 | agent. */ | |
1036 | struct ipa_trace_buffer_control | |
1037 | { | |
1038 | uintptr_t start; | |
1039 | uintptr_t free; | |
1040 | uintptr_t end_free; | |
1041 | uintptr_t wrap; | |
1042 | }; | |
1043 | ||
1044 | ||
1045 | /* We have possibly both GDBserver and an inferior thread accessing | |
1046 | the same IPA trace buffer memory. The IPA is the producer (tries | |
1047 | to put new frames in the buffer), while GDBserver occasionally | |
1048 | consumes them, that is, flushes the IPA's buffer into its own | |
1049 | buffer. Both sides need to update the trace buffer control | |
1050 | pointers (current head, tail, etc.). We can't use a global lock to | |
1051 | synchronize the accesses, as otherwise we could deadlock GDBserver | |
1052 | (if the thread holding the lock stops for a signal, say). So | |
1053 | instead of that, we use a transaction scheme where GDBserver writes | |
1054 | always prevail over the IPAs writes, and, we have the IPA detect | |
1055 | the commit failure/overwrite, and retry the whole attempt. This is | |
1056 | mainly implemented by having a global token object that represents | |
1057 | who wrote last to the buffer control structure. We need to freeze | |
1058 | any inferior writing to the buffer while GDBserver touches memory, | |
1059 | so that the inferior can correctly detect that GDBserver had been | |
1060 | there, otherwise, it could mistakingly think its commit was | |
1061 | successful; that's implemented by simply having GDBserver set a | |
1062 | breakpoint the inferior hits if it is the critical region. | |
1063 | ||
1064 | There are three cycling trace buffer control structure copies | |
1065 | (buffer head, tail, etc.), with the token object including an index | |
1066 | indicating which is current live copy. The IPA tentatively builds | |
1067 | an updated copy in a non-current control structure, while GDBserver | |
1068 | always clobbers the current version directly. The IPA then tries | |
1069 | to atomically "commit" its version; if GDBserver clobbered the | |
1070 | structure meanwhile, that will fail, and the IPA restarts the | |
1071 | allocation process. | |
1072 | ||
1073 | Listing the step in further detail, we have: | |
1074 | ||
1075 | In-process agent (producer): | |
1076 | ||
1077 | - passes by `about_to_request_buffer_space' breakpoint/lock | |
1078 | ||
1079 | - reads current token, extracts current trace buffer control index, | |
1080 | and starts tentatively updating the rightmost one (0->1, 1->2, | |
1081 | 2->0). Note that only one inferior thread is executing this code | |
1082 | at any given time, due to an outer lock in the jump pads. | |
219f2f23 | 1083 | |
fa593d66 | 1084 | - updates counters, and tries to commit the token. |
219f2f23 | 1085 | |
fa593d66 PA |
1086 | - passes by second `about_to_request_buffer_space' breakpoint/lock, |
1087 | leaving the sync region. | |
219f2f23 | 1088 | |
fa593d66 | 1089 | - checks if the update was effective. |
219f2f23 | 1090 | |
fa593d66 PA |
1091 | - if trace buffer was found full, hits flush_trace_buffer |
1092 | breakpoint, and restarts later afterwards. | |
219f2f23 | 1093 | |
fa593d66 | 1094 | GDBserver (consumer): |
219f2f23 | 1095 | |
fa593d66 PA |
1096 | - sets `about_to_request_buffer_space' breakpoint/lock. |
1097 | ||
1098 | - updates the token unconditionally, using the current buffer | |
1099 | control index, since it knows that the IP agent always writes to | |
1100 | the rightmost, and due to the breakpoint, at most one IP thread | |
1101 | can try to update the trace buffer concurrently to GDBserver, so | |
1102 | there will be no danger of trace buffer control index wrap making | |
1103 | the IPA write to the same index as GDBserver. | |
1104 | ||
1105 | - flushes the IP agent's trace buffer completely, and updates the | |
1106 | current trace buffer control structure. GDBserver *always* wins. | |
1107 | ||
1108 | - removes the `about_to_request_buffer_space' breakpoint. | |
1109 | ||
1110 | The token is stored in the `trace_buffer_ctrl_curr' variable. | |
1111 | Internally, it's bits are defined as: | |
1112 | ||
1113 | |-------------+-----+-------------+--------+-------------+--------------| | |
1114 | | Bit offsets | 31 | 30 - 20 | 19 | 18-8 | 7-0 | | |
1115 | |-------------+-----+-------------+--------+-------------+--------------| | |
1116 | | What | GSB | PC (11-bit) | unused | CC (11-bit) | TBCI (8-bit) | | |
1117 | |-------------+-----+-------------+--------+-------------+--------------| | |
1118 | ||
1119 | GSB - GDBserver Stamp Bit | |
1120 | PC - Previous Counter | |
1121 | CC - Current Counter | |
1122 | TBCI - Trace Buffer Control Index | |
1123 | ||
1124 | ||
1125 | An IPA update of `trace_buffer_ctrl_curr' does: | |
1126 | ||
1127 | - read CC from the current token, save as PC. | |
1128 | - updates pointers | |
1129 | - atomically tries to write PC+1,CC | |
1130 | ||
1131 | A GDBserver update of `trace_buffer_ctrl_curr' does: | |
1132 | ||
1133 | - reads PC and CC from the current token. | |
1134 | - updates pointers | |
1135 | - writes GSB,PC,CC | |
1136 | */ | |
1137 | ||
1138 | /* These are the bits of `trace_buffer_ctrl_curr' that are reserved | |
1139 | for the counters described below. The cleared bits are used to | |
1140 | hold the index of the items of the `trace_buffer_ctrl' array that | |
1141 | is "current". */ | |
1142 | #define GDBSERVER_FLUSH_COUNT_MASK 0xfffffff0 | |
1143 | ||
1144 | /* `trace_buffer_ctrl_curr' contains two counters. The `previous' | |
1145 | counter, and the `current' counter. */ | |
1146 | ||
1147 | #define GDBSERVER_FLUSH_COUNT_MASK_PREV 0x7ff00000 | |
1148 | #define GDBSERVER_FLUSH_COUNT_MASK_CURR 0x0007ff00 | |
1149 | ||
1150 | /* When GDBserver update the IP agent's `trace_buffer_ctrl_curr', it | |
1151 | always stamps this bit as set. */ | |
1152 | #define GDBSERVER_UPDATED_FLUSH_COUNT_BIT 0x80000000 | |
1153 | ||
1154 | #ifdef IN_PROCESS_AGENT | |
1155 | IP_AGENT_EXPORT struct trace_buffer_control trace_buffer_ctrl[3]; | |
1156 | IP_AGENT_EXPORT unsigned int trace_buffer_ctrl_curr; | |
1157 | ||
1158 | # define TRACE_BUFFER_CTRL_CURR \ | |
1159 | (trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK) | |
1160 | ||
1161 | #else | |
1162 | ||
1163 | /* The GDBserver side agent only needs one instance of this object, as | |
1164 | it doesn't need to sync with itself. Define it as array anyway so | |
1165 | that the rest of the code base doesn't need to care for the | |
1166 | difference. */ | |
1167 | struct trace_buffer_control trace_buffer_ctrl[1]; | |
1168 | # define TRACE_BUFFER_CTRL_CURR 0 | |
1169 | #endif | |
1170 | ||
1171 | /* These are convenience macros used to access the current trace | |
1172 | buffer control in effect. */ | |
1173 | #define trace_buffer_start (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].start) | |
1174 | #define trace_buffer_free (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].free) | |
1175 | #define trace_buffer_end_free \ | |
1176 | (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].end_free) | |
1177 | #define trace_buffer_wrap (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].wrap) | |
219f2f23 | 1178 | |
219f2f23 PA |
1179 | |
1180 | /* Macro that returns a pointer to the first traceframe in the buffer. */ | |
1181 | ||
1182 | #define FIRST_TRACEFRAME() ((struct traceframe *) trace_buffer_start) | |
1183 | ||
1184 | /* Macro that returns a pointer to the next traceframe in the buffer. | |
1185 | If the computed location is beyond the wraparound point, subtract | |
1186 | the offset of the wraparound. */ | |
1187 | ||
1188 | #define NEXT_TRACEFRAME_1(TF) \ | |
1189 | (((unsigned char *) (TF)) + sizeof (struct traceframe) + (TF)->data_size) | |
1190 | ||
1191 | #define NEXT_TRACEFRAME(TF) \ | |
1192 | ((struct traceframe *) (NEXT_TRACEFRAME_1 (TF) \ | |
1193 | - ((NEXT_TRACEFRAME_1 (TF) >= trace_buffer_wrap) \ | |
1194 | ? (trace_buffer_wrap - trace_buffer_lo) \ | |
1195 | : 0))) | |
1196 | ||
1197 | /* The difference between these counters represents the total number | |
fa593d66 PA |
1198 | of complete traceframes present in the trace buffer. The IP agent |
1199 | writes to the write count, GDBserver writes to read count. */ | |
219f2f23 | 1200 | |
fa593d66 PA |
1201 | IP_AGENT_EXPORT unsigned int traceframe_write_count; |
1202 | IP_AGENT_EXPORT unsigned int traceframe_read_count; | |
219f2f23 PA |
1203 | |
1204 | /* Convenience macro. */ | |
1205 | ||
1206 | #define traceframe_count \ | |
1207 | ((unsigned int) (traceframe_write_count - traceframe_read_count)) | |
1208 | ||
1209 | /* The count of all traceframes created in the current run, including | |
1210 | ones that were discarded to make room. */ | |
1211 | ||
fa593d66 PA |
1212 | IP_AGENT_EXPORT int traceframes_created; |
1213 | ||
1214 | #ifndef IN_PROCESS_AGENT | |
219f2f23 PA |
1215 | |
1216 | /* Read-only regions are address ranges whose contents don't change, | |
1217 | and so can be read from target memory even while looking at a trace | |
1218 | frame. Without these, disassembly for instance will likely fail, | |
1219 | because the program code is not usually collected into a trace | |
1220 | frame. This data structure does not need to be very complicated or | |
1221 | particularly efficient, it's only going to be used occasionally, | |
1222 | and only by some commands. */ | |
1223 | ||
1224 | struct readonly_region | |
1225 | { | |
1226 | /* The bounds of the region. */ | |
1227 | CORE_ADDR start, end; | |
1228 | ||
1229 | /* Link to the next one. */ | |
1230 | struct readonly_region *next; | |
1231 | }; | |
1232 | ||
1233 | /* Linked list of readonly regions. This list stays in effect from | |
1234 | one tstart to the next. */ | |
1235 | ||
1236 | static struct readonly_region *readonly_regions; | |
1237 | ||
fa593d66 PA |
1238 | #endif |
1239 | ||
219f2f23 PA |
1240 | /* The global that controls tracing overall. */ |
1241 | ||
fa593d66 PA |
1242 | IP_AGENT_EXPORT int tracing; |
1243 | ||
1244 | #ifndef IN_PROCESS_AGENT | |
8336d594 PA |
1245 | |
1246 | /* Controls whether tracing should continue after GDB disconnects. */ | |
1247 | ||
1248 | int disconnected_tracing; | |
219f2f23 PA |
1249 | |
1250 | /* The reason for the last tracing run to have stopped. We initialize | |
1251 | to a distinct string so that GDB can distinguish between "stopped | |
1252 | after running" and "stopped because never run" cases. */ | |
1253 | ||
1254 | static const char *tracing_stop_reason = "tnotrun"; | |
1255 | ||
1256 | static int tracing_stop_tpnum; | |
1257 | ||
f196051f SS |
1258 | /* 64-bit timestamps for the trace run's start and finish, expressed |
1259 | in microseconds from the Unix epoch. */ | |
1260 | ||
1261 | LONGEST tracing_start_time; | |
1262 | LONGEST tracing_stop_time; | |
1263 | ||
1264 | /* The (optional) user-supplied name of the user that started the run. | |
1265 | This is an arbitrary string, and may be NULL. */ | |
1266 | ||
1267 | char *tracing_user_name; | |
1268 | ||
1269 | /* Optional user-supplied text describing the run. This is | |
1270 | an arbitrary string, and may be NULL. */ | |
1271 | ||
1272 | char *tracing_notes; | |
1273 | ||
1274 | /* Optional user-supplied text explaining a tstop command. This is an | |
1275 | arbitrary string, and may be NULL. */ | |
1276 | ||
1277 | char *tracing_stop_note; | |
1278 | ||
fa593d66 PA |
1279 | #endif |
1280 | ||
219f2f23 PA |
1281 | /* Functions local to this file. */ |
1282 | ||
1283 | /* Base "class" for tracepoint type specific data to be passed down to | |
fa593d66 | 1284 | collect_data_at_tracepoint. */ |
219f2f23 PA |
1285 | struct tracepoint_hit_ctx |
1286 | { | |
fa593d66 | 1287 | enum tracepoint_type type; |
219f2f23 PA |
1288 | }; |
1289 | ||
fa593d66 PA |
1290 | #ifdef IN_PROCESS_AGENT |
1291 | ||
1292 | /* Fast/jump tracepoint specific data to be passed down to | |
219f2f23 | 1293 | collect_data_at_tracepoint. */ |
fa593d66 PA |
1294 | struct fast_tracepoint_ctx |
1295 | { | |
1296 | struct tracepoint_hit_ctx base; | |
1297 | ||
1298 | struct regcache regcache; | |
1299 | int regcache_initted; | |
1300 | unsigned char *regspace; | |
1301 | ||
1302 | unsigned char *regs; | |
1303 | struct tracepoint *tpoint; | |
1304 | }; | |
219f2f23 | 1305 | |
0fb4aa4b PA |
1306 | /* Static tracepoint specific data to be passed down to |
1307 | collect_data_at_tracepoint. */ | |
1308 | struct static_tracepoint_ctx | |
1309 | { | |
1310 | struct tracepoint_hit_ctx base; | |
1311 | ||
1312 | /* The regcache corresponding to the registers state at the time of | |
1313 | the tracepoint hit. Initialized lazily, from REGS. */ | |
1314 | struct regcache regcache; | |
1315 | int regcache_initted; | |
1316 | ||
1317 | /* The buffer space REGCACHE above uses. We use a separate buffer | |
1318 | instead of letting the regcache malloc for both signal safety and | |
1319 | performance reasons; this is allocated on the stack instead. */ | |
1320 | unsigned char *regspace; | |
1321 | ||
1322 | /* The register buffer as passed on by lttng/ust. */ | |
1323 | struct registers *regs; | |
1324 | ||
1325 | /* The "printf" formatter and the args the user passed to the marker | |
1326 | call. We use this to be able to collect "static trace data" | |
1327 | ($_sdata). */ | |
1328 | const char *fmt; | |
1329 | va_list *args; | |
1330 | ||
1331 | /* The GDB tracepoint matching the probed marker that was "hit". */ | |
1332 | struct tracepoint *tpoint; | |
1333 | }; | |
1334 | ||
fa593d66 PA |
1335 | #else |
1336 | ||
1337 | /* Static tracepoint specific data to be passed down to | |
1338 | collect_data_at_tracepoint. */ | |
219f2f23 PA |
1339 | struct trap_tracepoint_ctx |
1340 | { | |
1341 | struct tracepoint_hit_ctx base; | |
1342 | ||
1343 | struct regcache *regcache; | |
1344 | }; | |
1345 | ||
fa593d66 PA |
1346 | #endif |
1347 | ||
5e1dc496 LM |
1348 | static enum eval_result_type |
1349 | eval_tracepoint_agent_expr (struct tracepoint_hit_ctx *ctx, | |
1350 | struct traceframe *tframe, | |
1351 | struct agent_expr *aexpr, | |
1352 | ULONGEST *rslt); | |
219f2f23 | 1353 | |
fa593d66 | 1354 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1355 | static CORE_ADDR traceframe_get_pc (struct traceframe *tframe); |
1356 | static int traceframe_read_tsv (int num, LONGEST *val); | |
fa593d66 | 1357 | #endif |
219f2f23 PA |
1358 | |
1359 | static int condition_true_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
1360 | struct tracepoint *tpoint); | |
1361 | ||
fa593d66 | 1362 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1363 | static void clear_readonly_regions (void); |
1364 | static void clear_installed_tracepoints (void); | |
fa593d66 | 1365 | #endif |
219f2f23 PA |
1366 | |
1367 | static void collect_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
1368 | CORE_ADDR stop_pc, | |
1369 | struct tracepoint *tpoint); | |
fa593d66 | 1370 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1371 | static void collect_data_at_step (struct tracepoint_hit_ctx *ctx, |
1372 | CORE_ADDR stop_pc, | |
1373 | struct tracepoint *tpoint, int current_step); | |
6a271cae PA |
1374 | static void compile_tracepoint_condition (struct tracepoint *tpoint, |
1375 | CORE_ADDR *jump_entry); | |
fa593d66 | 1376 | #endif |
219f2f23 PA |
1377 | static void do_action_at_tracepoint (struct tracepoint_hit_ctx *ctx, |
1378 | CORE_ADDR stop_pc, | |
1379 | struct tracepoint *tpoint, | |
1380 | struct traceframe *tframe, | |
1381 | struct tracepoint_action *taction); | |
1382 | ||
fa593d66 PA |
1383 | #ifndef IN_PROCESS_AGENT |
1384 | static struct tracepoint *fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR); | |
1e4d1764 YQ |
1385 | |
1386 | static void install_tracepoint (struct tracepoint *, char *own_buf); | |
1387 | static void download_tracepoint (struct tracepoint *); | |
405f8e94 | 1388 | static int install_fast_tracepoint (struct tracepoint *, char *errbuf); |
fc3e5175 YQ |
1389 | static void clone_fast_tracepoint (struct tracepoint *to, |
1390 | const struct tracepoint *from); | |
fa593d66 PA |
1391 | #endif |
1392 | ||
f196051f SS |
1393 | static LONGEST get_timestamp (void); |
1394 | ||
fa593d66 PA |
1395 | #if defined(__GNUC__) |
1396 | # define memory_barrier() asm volatile ("" : : : "memory") | |
1397 | #else | |
1398 | # define memory_barrier() do {} while (0) | |
1399 | #endif | |
1400 | ||
1401 | /* We only build the IPA if this builtin is supported, and there are | |
1402 | no uses of this in GDBserver itself, so we're safe in defining this | |
1403 | unconditionally. */ | |
1404 | #define cmpxchg(mem, oldval, newval) \ | |
1405 | __sync_val_compare_and_swap (mem, oldval, newval) | |
1406 | ||
219f2f23 PA |
1407 | /* Record that an error occurred during expression evaluation. */ |
1408 | ||
1409 | static void | |
1410 | record_tracepoint_error (struct tracepoint *tpoint, const char *which, | |
1411 | enum eval_result_type rtype) | |
1412 | { | |
1413 | trace_debug ("Tracepoint %d at %s %s eval reports error %d", | |
1414 | tpoint->number, paddress (tpoint->address), which, rtype); | |
1415 | ||
fa593d66 PA |
1416 | #ifdef IN_PROCESS_AGENT |
1417 | /* Only record the first error we get. */ | |
1418 | if (cmpxchg (&expr_eval_result, | |
1419 | expr_eval_no_error, | |
1420 | rtype) != expr_eval_no_error) | |
1421 | return; | |
1422 | #else | |
1423 | if (expr_eval_result != expr_eval_no_error) | |
1424 | return; | |
1425 | #endif | |
1426 | ||
219f2f23 PA |
1427 | error_tracepoint = tpoint; |
1428 | } | |
1429 | ||
1430 | /* Trace buffer management. */ | |
1431 | ||
1432 | static void | |
1433 | clear_trace_buffer (void) | |
1434 | { | |
1435 | trace_buffer_start = trace_buffer_lo; | |
1436 | trace_buffer_free = trace_buffer_lo; | |
1437 | trace_buffer_end_free = trace_buffer_hi; | |
1438 | trace_buffer_wrap = trace_buffer_hi; | |
1439 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1440 | ((struct traceframe *) trace_buffer_free)->tpnum = 0; | |
1441 | ((struct traceframe *) trace_buffer_free)->data_size = 0; | |
1442 | traceframe_read_count = traceframe_write_count = 0; | |
1443 | traceframes_created = 0; | |
1444 | } | |
1445 | ||
fa593d66 PA |
1446 | #ifndef IN_PROCESS_AGENT |
1447 | ||
1448 | static void | |
1449 | clear_inferior_trace_buffer (void) | |
1450 | { | |
1451 | CORE_ADDR ipa_trace_buffer_lo; | |
1452 | CORE_ADDR ipa_trace_buffer_hi; | |
1453 | struct traceframe ipa_traceframe = { 0 }; | |
1454 | struct ipa_trace_buffer_control ipa_trace_buffer_ctrl; | |
1455 | ||
1456 | read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_lo, | |
1457 | &ipa_trace_buffer_lo); | |
1458 | read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_hi, | |
1459 | &ipa_trace_buffer_hi); | |
1460 | ||
1461 | ipa_trace_buffer_ctrl.start = ipa_trace_buffer_lo; | |
1462 | ipa_trace_buffer_ctrl.free = ipa_trace_buffer_lo; | |
1463 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_hi; | |
1464 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
1465 | ||
1466 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1467 | write_inferior_memory (ipa_sym_addrs.addr_trace_buffer_ctrl, | |
1468 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
1469 | sizeof (ipa_trace_buffer_ctrl)); | |
1470 | ||
1471 | write_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, 0); | |
1472 | ||
1473 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1474 | write_inferior_memory (ipa_trace_buffer_lo, | |
1475 | (unsigned char *) &ipa_traceframe, | |
1476 | sizeof (ipa_traceframe)); | |
1477 | ||
1478 | write_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, 0); | |
1479 | write_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, 0); | |
1480 | write_inferior_integer (ipa_sym_addrs.addr_traceframes_created, 0); | |
1481 | } | |
1482 | ||
1483 | #endif | |
1484 | ||
219f2f23 PA |
1485 | static void |
1486 | init_trace_buffer (unsigned char *buf, int bufsize) | |
1487 | { | |
1488 | trace_buffer_lo = buf; | |
1489 | trace_buffer_hi = trace_buffer_lo + bufsize; | |
1490 | ||
1491 | clear_trace_buffer (); | |
1492 | } | |
1493 | ||
fa593d66 PA |
1494 | #ifdef IN_PROCESS_AGENT |
1495 | ||
1496 | IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE | |
1497 | about_to_request_buffer_space (void) | |
1498 | { | |
1499 | /* GDBserver places breakpoint here while it goes about to flush | |
1500 | data at random times. */ | |
1501 | UNKNOWN_SIDE_EFFECTS(); | |
1502 | } | |
1503 | ||
1504 | #endif | |
1505 | ||
219f2f23 PA |
1506 | /* Carve out a piece of the trace buffer, returning NULL in case of |
1507 | failure. */ | |
1508 | ||
1509 | static void * | |
1510 | trace_buffer_alloc (size_t amt) | |
1511 | { | |
1512 | unsigned char *rslt; | |
fa593d66 PA |
1513 | struct trace_buffer_control *tbctrl; |
1514 | unsigned int curr; | |
1515 | #ifdef IN_PROCESS_AGENT | |
1516 | unsigned int prev, prev_filtered; | |
1517 | unsigned int commit_count; | |
1518 | unsigned int commit; | |
1519 | unsigned int readout; | |
1520 | #else | |
219f2f23 PA |
1521 | struct traceframe *oldest; |
1522 | unsigned char *new_start; | |
fa593d66 | 1523 | #endif |
219f2f23 PA |
1524 | |
1525 | trace_debug ("Want to allocate %ld+%ld bytes in trace buffer", | |
1526 | (long) amt, (long) sizeof (struct traceframe)); | |
1527 | ||
1528 | /* Account for the EOB marker. */ | |
1529 | amt += sizeof (struct traceframe); | |
1530 | ||
fa593d66 PA |
1531 | #ifdef IN_PROCESS_AGENT |
1532 | again: | |
1533 | memory_barrier (); | |
1534 | ||
1535 | /* Read the current token and extract the index to try to write to, | |
1536 | storing it in CURR. */ | |
1537 | prev = trace_buffer_ctrl_curr; | |
1538 | prev_filtered = prev & ~GDBSERVER_FLUSH_COUNT_MASK; | |
1539 | curr = prev_filtered + 1; | |
1540 | if (curr > 2) | |
1541 | curr = 0; | |
1542 | ||
1543 | about_to_request_buffer_space (); | |
1544 | ||
1545 | /* Start out with a copy of the current state. GDBserver may be | |
1546 | midway writing to the PREV_FILTERED TBC, but, that's OK, we won't | |
1547 | be able to commit anyway if that happens. */ | |
1548 | trace_buffer_ctrl[curr] | |
1549 | = trace_buffer_ctrl[prev_filtered]; | |
1550 | trace_debug ("trying curr=%u", curr); | |
1551 | #else | |
1552 | /* The GDBserver's agent doesn't need all that syncing, and always | |
1553 | updates TCB 0 (there's only one, mind you). */ | |
1554 | curr = 0; | |
1555 | #endif | |
1556 | tbctrl = &trace_buffer_ctrl[curr]; | |
1557 | ||
219f2f23 PA |
1558 | /* Offsets are easier to grok for debugging than raw addresses, |
1559 | especially for the small trace buffer sizes that are useful for | |
1560 | testing. */ | |
fa593d66 PA |
1561 | trace_debug ("Trace buffer [%d] start=%d free=%d endfree=%d wrap=%d hi=%d", |
1562 | curr, | |
1563 | (int) (tbctrl->start - trace_buffer_lo), | |
1564 | (int) (tbctrl->free - trace_buffer_lo), | |
1565 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1566 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1567 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1568 | ||
1569 | /* The algorithm here is to keep trying to get a contiguous block of | |
1570 | the requested size, possibly discarding older traceframes to free | |
1571 | up space. Since free space might come in one or two pieces, | |
1572 | depending on whether discarded traceframes wrapped around at the | |
1573 | high end of the buffer, we test both pieces after each | |
1574 | discard. */ | |
1575 | while (1) | |
1576 | { | |
1577 | /* First, if we have two free parts, try the upper one first. */ | |
fa593d66 | 1578 | if (tbctrl->end_free < tbctrl->free) |
219f2f23 | 1579 | { |
fa593d66 | 1580 | if (tbctrl->free + amt <= trace_buffer_hi) |
219f2f23 PA |
1581 | /* We have enough in the upper part. */ |
1582 | break; | |
1583 | else | |
1584 | { | |
1585 | /* Our high part of free space wasn't enough. Give up | |
1586 | on it for now, set wraparound. We will recover the | |
1587 | space later, if/when the wrapped-around traceframe is | |
1588 | discarded. */ | |
1589 | trace_debug ("Upper part too small, setting wraparound"); | |
fa593d66 PA |
1590 | tbctrl->wrap = tbctrl->free; |
1591 | tbctrl->free = trace_buffer_lo; | |
219f2f23 PA |
1592 | } |
1593 | } | |
1594 | ||
1595 | /* The normal case. */ | |
fa593d66 | 1596 | if (tbctrl->free + amt <= tbctrl->end_free) |
219f2f23 PA |
1597 | break; |
1598 | ||
fa593d66 PA |
1599 | #ifdef IN_PROCESS_AGENT |
1600 | /* The IP Agent's buffer is always circular. It isn't used | |
1601 | currently, but `circular_trace_buffer' could represent | |
1602 | GDBserver's mode. If we didn't find space, ask GDBserver to | |
1603 | flush. */ | |
1604 | ||
1605 | flush_trace_buffer (); | |
1606 | memory_barrier (); | |
1607 | if (tracing) | |
1608 | { | |
1609 | trace_debug ("gdbserver flushed buffer, retrying"); | |
1610 | goto again; | |
1611 | } | |
1612 | ||
1613 | /* GDBserver cancelled the tracing. Bail out as well. */ | |
1614 | return NULL; | |
1615 | #else | |
219f2f23 PA |
1616 | /* If we're here, then neither part is big enough, and |
1617 | non-circular trace buffers are now full. */ | |
1618 | if (!circular_trace_buffer) | |
1619 | { | |
1620 | trace_debug ("Not enough space in the trace buffer"); | |
1621 | return NULL; | |
1622 | } | |
1623 | ||
1624 | trace_debug ("Need more space in the trace buffer"); | |
1625 | ||
1626 | /* If we have a circular buffer, we can try discarding the | |
1627 | oldest traceframe and see if that helps. */ | |
1628 | oldest = FIRST_TRACEFRAME (); | |
1629 | if (oldest->tpnum == 0) | |
1630 | { | |
1631 | /* Not good; we have no traceframes to free. Perhaps we're | |
1632 | asking for a block that is larger than the buffer? In | |
1633 | any case, give up. */ | |
1634 | trace_debug ("No traceframes to discard"); | |
1635 | return NULL; | |
1636 | } | |
1637 | ||
fa593d66 PA |
1638 | /* We don't run this code in the in-process agent currently. |
1639 | E.g., we could leave the in-process agent in autonomous | |
1640 | circular mode if we only have fast tracepoints. If we do | |
1641 | that, then this bit becomes racy with GDBserver, which also | |
1642 | writes to this counter. */ | |
219f2f23 PA |
1643 | --traceframe_write_count; |
1644 | ||
1645 | new_start = (unsigned char *) NEXT_TRACEFRAME (oldest); | |
1646 | /* If we freed the traceframe that wrapped around, go back | |
1647 | to the non-wrap case. */ | |
fa593d66 | 1648 | if (new_start < tbctrl->start) |
219f2f23 PA |
1649 | { |
1650 | trace_debug ("Discarding past the wraparound"); | |
fa593d66 | 1651 | tbctrl->wrap = trace_buffer_hi; |
219f2f23 | 1652 | } |
fa593d66 PA |
1653 | tbctrl->start = new_start; |
1654 | tbctrl->end_free = tbctrl->start; | |
219f2f23 PA |
1655 | |
1656 | trace_debug ("Discarded a traceframe\n" | |
fa593d66 PA |
1657 | "Trace buffer [%d], start=%d free=%d " |
1658 | "endfree=%d wrap=%d hi=%d", | |
1659 | curr, | |
1660 | (int) (tbctrl->start - trace_buffer_lo), | |
1661 | (int) (tbctrl->free - trace_buffer_lo), | |
1662 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1663 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1664 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1665 | ||
1666 | /* Now go back around the loop. The discard might have resulted | |
1667 | in either one or two pieces of free space, so we want to try | |
1668 | both before freeing any more traceframes. */ | |
fa593d66 | 1669 | #endif |
219f2f23 PA |
1670 | } |
1671 | ||
1672 | /* If we get here, we know we can provide the asked-for space. */ | |
1673 | ||
fa593d66 | 1674 | rslt = tbctrl->free; |
219f2f23 PA |
1675 | |
1676 | /* Adjust the request back down, now that we know we have space for | |
fa593d66 PA |
1677 | the marker, but don't commit to AMT yet, we may still need to |
1678 | restart the operation if GDBserver touches the trace buffer | |
1679 | (obviously only important in the in-process agent's version). */ | |
1680 | tbctrl->free += (amt - sizeof (struct traceframe)); | |
1681 | ||
1682 | /* Or not. If GDBserver changed the trace buffer behind our back, | |
1683 | we get to restart a new allocation attempt. */ | |
1684 | ||
1685 | #ifdef IN_PROCESS_AGENT | |
1686 | /* Build the tentative token. */ | |
2ece8244 YQ |
1687 | commit_count = (((prev & GDBSERVER_FLUSH_COUNT_MASK_CURR) + 0x100) |
1688 | & GDBSERVER_FLUSH_COUNT_MASK_CURR); | |
1689 | commit = (((prev & GDBSERVER_FLUSH_COUNT_MASK_CURR) << 12) | |
fa593d66 PA |
1690 | | commit_count |
1691 | | curr); | |
1692 | ||
1693 | /* Try to commit it. */ | |
1694 | readout = cmpxchg (&trace_buffer_ctrl_curr, prev, commit); | |
1695 | if (readout != prev) | |
1696 | { | |
1697 | trace_debug ("GDBserver has touched the trace buffer, restarting." | |
1698 | " (prev=%08x, commit=%08x, readout=%08x)", | |
1699 | prev, commit, readout); | |
1700 | goto again; | |
1701 | } | |
219f2f23 | 1702 | |
fa593d66 PA |
1703 | /* Hold your horses here. Even if that change was committed, |
1704 | GDBserver could come in, and clobber it. We need to hold to be | |
1705 | able to tell if GDBserver clobbers before or after we committed | |
1706 | the change. Whenever GDBserver goes about touching the IPA | |
1707 | buffer, it sets a breakpoint in this routine, so we have a sync | |
1708 | point here. */ | |
1709 | about_to_request_buffer_space (); | |
219f2f23 | 1710 | |
fa593d66 PA |
1711 | /* Check if the change has been effective, even if GDBserver stopped |
1712 | us at the breakpoint. */ | |
219f2f23 | 1713 | |
fa593d66 PA |
1714 | { |
1715 | unsigned int refetch; | |
219f2f23 | 1716 | |
fa593d66 PA |
1717 | memory_barrier (); |
1718 | ||
1719 | refetch = trace_buffer_ctrl_curr; | |
1720 | ||
2ece8244 YQ |
1721 | if (refetch == commit |
1722 | || ((refetch & GDBSERVER_FLUSH_COUNT_MASK_PREV) >> 12) == commit_count) | |
fa593d66 PA |
1723 | { |
1724 | /* effective */ | |
1725 | trace_debug ("change is effective: (prev=%08x, commit=%08x, " | |
1726 | "readout=%08x, refetch=%08x)", | |
1727 | prev, commit, readout, refetch); | |
1728 | } | |
1729 | else | |
1730 | { | |
1731 | trace_debug ("GDBserver has touched the trace buffer, not effective." | |
1732 | " (prev=%08x, commit=%08x, readout=%08x, refetch=%08x)", | |
1733 | prev, commit, readout, refetch); | |
1734 | goto again; | |
1735 | } | |
1736 | } | |
1737 | #endif | |
1738 | ||
1739 | /* We have a new piece of the trace buffer. Hurray! */ | |
1740 | ||
1741 | /* Add an EOB marker just past this allocation. */ | |
1742 | ((struct traceframe *) tbctrl->free)->tpnum = 0; | |
1743 | ((struct traceframe *) tbctrl->free)->data_size = 0; | |
1744 | ||
1745 | /* Adjust the request back down, now that we know we have space for | |
1746 | the marker. */ | |
1747 | amt -= sizeof (struct traceframe); | |
1748 | ||
1749 | if (debug_threads) | |
1750 | { | |
219f2f23 | 1751 | trace_debug ("Allocated %d bytes", (int) amt); |
fa593d66 PA |
1752 | trace_debug ("Trace buffer [%d] start=%d free=%d " |
1753 | "endfree=%d wrap=%d hi=%d", | |
1754 | curr, | |
1755 | (int) (tbctrl->start - trace_buffer_lo), | |
1756 | (int) (tbctrl->free - trace_buffer_lo), | |
1757 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1758 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1759 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1760 | } | |
1761 | ||
1762 | return rslt; | |
1763 | } | |
1764 | ||
fa593d66 PA |
1765 | #ifndef IN_PROCESS_AGENT |
1766 | ||
219f2f23 PA |
1767 | /* Return the total free space. This is not necessarily the largest |
1768 | block we can allocate, because of the two-part case. */ | |
1769 | ||
1770 | static int | |
1771 | free_space (void) | |
1772 | { | |
1773 | if (trace_buffer_free <= trace_buffer_end_free) | |
1774 | return trace_buffer_end_free - trace_buffer_free; | |
1775 | else | |
1776 | return ((trace_buffer_end_free - trace_buffer_lo) | |
1777 | + (trace_buffer_hi - trace_buffer_free)); | |
1778 | } | |
1779 | ||
1780 | /* An 'S' in continuation packets indicates remainder are for | |
1781 | while-stepping. */ | |
1782 | ||
1783 | static int seen_step_action_flag; | |
1784 | ||
1e4d1764 YQ |
1785 | /* Create a tracepoint (location) with given number and address. Add this |
1786 | new tracepoint to list and sort this list. */ | |
219f2f23 PA |
1787 | |
1788 | static struct tracepoint * | |
1789 | add_tracepoint (int num, CORE_ADDR addr) | |
1790 | { | |
1e4d1764 | 1791 | struct tracepoint *tpoint, **tp_next; |
219f2f23 PA |
1792 | |
1793 | tpoint = xmalloc (sizeof (struct tracepoint)); | |
1794 | tpoint->number = num; | |
1795 | tpoint->address = addr; | |
1796 | tpoint->numactions = 0; | |
1797 | tpoint->actions = NULL; | |
1798 | tpoint->actions_str = NULL; | |
1799 | tpoint->cond = NULL; | |
1800 | tpoint->num_step_actions = 0; | |
1801 | tpoint->step_actions = NULL; | |
1802 | tpoint->step_actions_str = NULL; | |
fa593d66 PA |
1803 | /* Start all off as regular (slow) tracepoints. */ |
1804 | tpoint->type = trap_tracepoint; | |
1805 | tpoint->orig_size = -1; | |
219f2f23 | 1806 | tpoint->source_strings = NULL; |
6a271cae | 1807 | tpoint->compiled_cond = 0; |
219f2f23 PA |
1808 | tpoint->handle = NULL; |
1809 | tpoint->next = NULL; | |
1810 | ||
1e4d1764 YQ |
1811 | /* Find a place to insert this tracepoint into list in order to keep |
1812 | the tracepoint list still in the ascending order. There may be | |
1813 | multiple tracepoints at the same address as TPOINT's, and this | |
1814 | guarantees TPOINT is inserted after all the tracepoints which are | |
1815 | set at the same address. For example, fast tracepoints A, B, C are | |
1816 | set at the same address, and D is to be insert at the same place as | |
1817 | well, | |
1818 | ||
1819 | -->| A |--> | B |-->| C |->... | |
1820 | ||
1821 | One jump pad was created for tracepoint A, B, and C, and the target | |
1822 | address of A is referenced/used in jump pad. So jump pad will let | |
1823 | inferior jump to A. If D is inserted in front of A, like this, | |
1824 | ||
1825 | -->| D |-->| A |--> | B |-->| C |->... | |
1826 | ||
1827 | without updating jump pad, D is not reachable during collect, which | |
1828 | is wrong. As we can see, the order of B, C and D doesn't matter, but | |
1829 | A should always be the `first' one. */ | |
1830 | for (tp_next = &tracepoints; | |
1831 | (*tp_next) != NULL && (*tp_next)->address <= tpoint->address; | |
1832 | tp_next = &(*tp_next)->next) | |
1833 | ; | |
1834 | tpoint->next = *tp_next; | |
1835 | *tp_next = tpoint; | |
219f2f23 PA |
1836 | last_tracepoint = tpoint; |
1837 | ||
1838 | seen_step_action_flag = 0; | |
1839 | ||
1840 | return tpoint; | |
1841 | } | |
1842 | ||
fa593d66 PA |
1843 | #ifndef IN_PROCESS_AGENT |
1844 | ||
219f2f23 PA |
1845 | /* Return the tracepoint with the given number and address, or NULL. */ |
1846 | ||
1847 | static struct tracepoint * | |
1848 | find_tracepoint (int id, CORE_ADDR addr) | |
1849 | { | |
1850 | struct tracepoint *tpoint; | |
1851 | ||
1852 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
1853 | if (tpoint->number == id && tpoint->address == addr) | |
1854 | return tpoint; | |
1855 | ||
1856 | return NULL; | |
1857 | } | |
1858 | ||
f4647387 YQ |
1859 | /* Remove TPOINT from global list. */ |
1860 | ||
1861 | static void | |
1862 | remove_tracepoint (struct tracepoint *tpoint) | |
1863 | { | |
1864 | struct tracepoint *tp, *tp_prev; | |
1865 | ||
1866 | for (tp = tracepoints, tp_prev = NULL; tp && tp != tpoint; | |
1867 | tp_prev = tp, tp = tp->next) | |
1868 | ; | |
1869 | ||
1870 | if (tp) | |
1871 | { | |
1872 | if (tp_prev) | |
1873 | tp_prev->next = tp->next; | |
1874 | else | |
1875 | tracepoints = tp->next; | |
1876 | ||
1877 | xfree (tp); | |
1878 | } | |
1879 | } | |
1880 | ||
219f2f23 PA |
1881 | /* There may be several tracepoints with the same number (because they |
1882 | are "locations", in GDB parlance); return the next one after the | |
1883 | given tracepoint, or search from the beginning of the list if the | |
1884 | first argument is NULL. */ | |
1885 | ||
1886 | static struct tracepoint * | |
1887 | find_next_tracepoint_by_number (struct tracepoint *prev_tp, int num) | |
1888 | { | |
1889 | struct tracepoint *tpoint; | |
1890 | ||
1891 | if (prev_tp) | |
1892 | tpoint = prev_tp->next; | |
1893 | else | |
1894 | tpoint = tracepoints; | |
1895 | for (; tpoint; tpoint = tpoint->next) | |
1896 | if (tpoint->number == num) | |
1897 | return tpoint; | |
1898 | ||
1899 | return NULL; | |
1900 | } | |
1901 | ||
fa593d66 PA |
1902 | #endif |
1903 | ||
219f2f23 PA |
1904 | static char * |
1905 | save_string (const char *str, size_t len) | |
1906 | { | |
1907 | char *s; | |
1908 | ||
1909 | s = xmalloc (len + 1); | |
1910 | memcpy (s, str, len); | |
1911 | s[len] = '\0'; | |
1912 | ||
1913 | return s; | |
1914 | } | |
1915 | ||
1916 | /* Append another action to perform when the tracepoint triggers. */ | |
1917 | ||
1918 | static void | |
1919 | add_tracepoint_action (struct tracepoint *tpoint, char *packet) | |
1920 | { | |
1921 | char *act; | |
1922 | ||
1923 | if (*packet == 'S') | |
1924 | { | |
1925 | seen_step_action_flag = 1; | |
1926 | ++packet; | |
1927 | } | |
1928 | ||
1929 | act = packet; | |
1930 | ||
1931 | while (*act) | |
1932 | { | |
1933 | char *act_start = act; | |
1934 | struct tracepoint_action *action = NULL; | |
1935 | ||
1936 | switch (*act) | |
1937 | { | |
1938 | case 'M': | |
1939 | { | |
1940 | struct collect_memory_action *maction; | |
1941 | ULONGEST basereg; | |
1942 | int is_neg; | |
1943 | ||
1944 | maction = xmalloc (sizeof *maction); | |
1945 | maction->base.type = *act; | |
8d0d92cd | 1946 | maction->base.ops = &m_tracepoint_action_ops; |
219f2f23 PA |
1947 | action = &maction->base; |
1948 | ||
1949 | ++act; | |
1950 | is_neg = (*act == '-'); | |
1951 | if (*act == '-') | |
1952 | ++act; | |
1953 | act = unpack_varlen_hex (act, &basereg); | |
1954 | ++act; | |
1955 | act = unpack_varlen_hex (act, &maction->addr); | |
1956 | ++act; | |
1957 | act = unpack_varlen_hex (act, &maction->len); | |
1958 | maction->basereg = (is_neg | |
1959 | ? - (int) basereg | |
1960 | : (int) basereg); | |
1961 | trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)", | |
1962 | pulongest (maction->len), | |
1963 | paddress (maction->addr), maction->basereg); | |
1964 | break; | |
1965 | } | |
1966 | case 'R': | |
1967 | { | |
1968 | struct collect_registers_action *raction; | |
1969 | ||
1970 | raction = xmalloc (sizeof *raction); | |
1971 | raction->base.type = *act; | |
8d0d92cd | 1972 | raction->base.ops = &r_tracepoint_action_ops; |
219f2f23 PA |
1973 | action = &raction->base; |
1974 | ||
1975 | trace_debug ("Want to collect registers"); | |
1976 | ++act; | |
1977 | /* skip past hex digits of mask for now */ | |
1978 | while (isxdigit(*act)) | |
1979 | ++act; | |
1980 | break; | |
1981 | } | |
0fb4aa4b PA |
1982 | case 'L': |
1983 | { | |
1984 | struct collect_static_trace_data_action *raction; | |
1985 | ||
1986 | raction = xmalloc (sizeof *raction); | |
1987 | raction->base.type = *act; | |
8d0d92cd | 1988 | raction->base.ops = &l_tracepoint_action_ops; |
0fb4aa4b PA |
1989 | action = &raction->base; |
1990 | ||
1991 | trace_debug ("Want to collect static trace data"); | |
1992 | ++act; | |
1993 | break; | |
1994 | } | |
219f2f23 PA |
1995 | case 'S': |
1996 | trace_debug ("Unexpected step action, ignoring"); | |
1997 | ++act; | |
1998 | break; | |
1999 | case 'X': | |
2000 | { | |
2001 | struct eval_expr_action *xaction; | |
2002 | ||
2003 | xaction = xmalloc (sizeof (*xaction)); | |
2004 | xaction->base.type = *act; | |
8d0d92cd | 2005 | xaction->base.ops = &x_tracepoint_action_ops; |
219f2f23 PA |
2006 | action = &xaction->base; |
2007 | ||
2008 | trace_debug ("Want to evaluate expression"); | |
5e1dc496 | 2009 | xaction->expr = gdb_parse_agent_expr (&act); |
219f2f23 PA |
2010 | break; |
2011 | } | |
2012 | default: | |
2013 | trace_debug ("unknown trace action '%c', ignoring...", *act); | |
2014 | break; | |
2015 | case '-': | |
2016 | break; | |
2017 | } | |
2018 | ||
2019 | if (action == NULL) | |
2020 | break; | |
2021 | ||
2022 | if (seen_step_action_flag) | |
2023 | { | |
2024 | tpoint->num_step_actions++; | |
2025 | ||
2026 | tpoint->step_actions | |
2027 | = xrealloc (tpoint->step_actions, | |
2028 | (sizeof (*tpoint->step_actions) | |
2029 | * tpoint->num_step_actions)); | |
2030 | tpoint->step_actions_str | |
2031 | = xrealloc (tpoint->step_actions_str, | |
2032 | (sizeof (*tpoint->step_actions_str) | |
2033 | * tpoint->num_step_actions)); | |
2034 | tpoint->step_actions[tpoint->num_step_actions - 1] = action; | |
2035 | tpoint->step_actions_str[tpoint->num_step_actions - 1] | |
2036 | = save_string (act_start, act - act_start); | |
2037 | } | |
2038 | else | |
2039 | { | |
2040 | tpoint->numactions++; | |
2041 | tpoint->actions | |
2042 | = xrealloc (tpoint->actions, | |
2043 | sizeof (*tpoint->actions) * tpoint->numactions); | |
2044 | tpoint->actions_str | |
2045 | = xrealloc (tpoint->actions_str, | |
2046 | sizeof (*tpoint->actions_str) * tpoint->numactions); | |
2047 | tpoint->actions[tpoint->numactions - 1] = action; | |
2048 | tpoint->actions_str[tpoint->numactions - 1] | |
2049 | = save_string (act_start, act - act_start); | |
2050 | } | |
2051 | } | |
2052 | } | |
2053 | ||
fa593d66 PA |
2054 | #endif |
2055 | ||
219f2f23 PA |
2056 | /* Find or create a trace state variable with the given number. */ |
2057 | ||
2058 | static struct trace_state_variable * | |
2059 | get_trace_state_variable (int num) | |
2060 | { | |
2061 | struct trace_state_variable *tsv; | |
2062 | ||
fa593d66 PA |
2063 | #ifdef IN_PROCESS_AGENT |
2064 | /* Search for an existing variable. */ | |
2065 | for (tsv = alloced_trace_state_variables; tsv; tsv = tsv->next) | |
2066 | if (tsv->number == num) | |
2067 | return tsv; | |
2068 | #endif | |
2069 | ||
219f2f23 PA |
2070 | /* Search for an existing variable. */ |
2071 | for (tsv = trace_state_variables; tsv; tsv = tsv->next) | |
2072 | if (tsv->number == num) | |
2073 | return tsv; | |
2074 | ||
2075 | return NULL; | |
2076 | } | |
2077 | ||
2078 | /* Find or create a trace state variable with the given number. */ | |
2079 | ||
2080 | static struct trace_state_variable * | |
fa593d66 | 2081 | create_trace_state_variable (int num, int gdb) |
219f2f23 PA |
2082 | { |
2083 | struct trace_state_variable *tsv; | |
2084 | ||
2085 | tsv = get_trace_state_variable (num); | |
2086 | if (tsv != NULL) | |
2087 | return tsv; | |
2088 | ||
2089 | /* Create a new variable. */ | |
2090 | tsv = xmalloc (sizeof (struct trace_state_variable)); | |
2091 | tsv->number = num; | |
2092 | tsv->initial_value = 0; | |
2093 | tsv->value = 0; | |
2094 | tsv->getter = NULL; | |
2095 | tsv->name = NULL; | |
fa593d66 PA |
2096 | #ifdef IN_PROCESS_AGENT |
2097 | if (!gdb) | |
2098 | { | |
2099 | tsv->next = alloced_trace_state_variables; | |
2100 | alloced_trace_state_variables = tsv; | |
2101 | } | |
2102 | else | |
2103 | #endif | |
2104 | { | |
2105 | tsv->next = trace_state_variables; | |
2106 | trace_state_variables = tsv; | |
2107 | } | |
219f2f23 PA |
2108 | return tsv; |
2109 | } | |
2110 | ||
6a271cae | 2111 | IP_AGENT_EXPORT LONGEST |
219f2f23 PA |
2112 | get_trace_state_variable_value (int num) |
2113 | { | |
2114 | struct trace_state_variable *tsv; | |
2115 | ||
2116 | tsv = get_trace_state_variable (num); | |
2117 | ||
2118 | if (!tsv) | |
2119 | { | |
2120 | trace_debug ("No trace state variable %d, skipping value get", num); | |
2121 | return 0; | |
2122 | } | |
2123 | ||
2124 | /* Call a getter function if we have one. While it's tempting to | |
2125 | set up something to only call the getter once per tracepoint hit, | |
2126 | it could run afoul of thread races. Better to let the getter | |
2127 | handle it directly, if necessary to worry about it. */ | |
2128 | if (tsv->getter) | |
2129 | tsv->value = (tsv->getter) (); | |
2130 | ||
2131 | trace_debug ("get_trace_state_variable_value(%d) ==> %s", | |
2132 | num, plongest (tsv->value)); | |
2133 | ||
2134 | return tsv->value; | |
2135 | } | |
2136 | ||
6a271cae | 2137 | IP_AGENT_EXPORT void |
219f2f23 PA |
2138 | set_trace_state_variable_value (int num, LONGEST val) |
2139 | { | |
2140 | struct trace_state_variable *tsv; | |
2141 | ||
2142 | tsv = get_trace_state_variable (num); | |
2143 | ||
2144 | if (!tsv) | |
2145 | { | |
2146 | trace_debug ("No trace state variable %d, skipping value set", num); | |
2147 | return; | |
2148 | } | |
2149 | ||
2150 | tsv->value = val; | |
2151 | } | |
2152 | ||
5e1dc496 LM |
2153 | LONGEST |
2154 | agent_get_trace_state_variable_value (int num) | |
2155 | { | |
2156 | return get_trace_state_variable_value (num); | |
2157 | } | |
2158 | ||
2159 | void | |
2160 | agent_set_trace_state_variable_value (int num, LONGEST val) | |
2161 | { | |
2162 | set_trace_state_variable_value (num, val); | |
2163 | } | |
2164 | ||
219f2f23 PA |
2165 | static void |
2166 | set_trace_state_variable_name (int num, const char *name) | |
2167 | { | |
2168 | struct trace_state_variable *tsv; | |
2169 | ||
2170 | tsv = get_trace_state_variable (num); | |
2171 | ||
2172 | if (!tsv) | |
2173 | { | |
2174 | trace_debug ("No trace state variable %d, skipping name set", num); | |
2175 | return; | |
2176 | } | |
2177 | ||
2178 | tsv->name = (char *) name; | |
2179 | } | |
2180 | ||
2181 | static void | |
2182 | set_trace_state_variable_getter (int num, LONGEST (*getter) (void)) | |
2183 | { | |
2184 | struct trace_state_variable *tsv; | |
2185 | ||
2186 | tsv = get_trace_state_variable (num); | |
2187 | ||
2188 | if (!tsv) | |
2189 | { | |
2190 | trace_debug ("No trace state variable %d, skipping getter set", num); | |
2191 | return; | |
2192 | } | |
2193 | ||
2194 | tsv->getter = getter; | |
2195 | } | |
2196 | ||
2197 | /* Add a raw traceframe for the given tracepoint. */ | |
2198 | ||
2199 | static struct traceframe * | |
2200 | add_traceframe (struct tracepoint *tpoint) | |
2201 | { | |
2202 | struct traceframe *tframe; | |
2203 | ||
2204 | tframe = trace_buffer_alloc (sizeof (struct traceframe)); | |
2205 | ||
2206 | if (tframe == NULL) | |
2207 | return NULL; | |
2208 | ||
2209 | tframe->tpnum = tpoint->number; | |
2210 | tframe->data_size = 0; | |
2211 | ||
2212 | return tframe; | |
2213 | } | |
2214 | ||
2215 | /* Add a block to the traceframe currently being worked on. */ | |
2216 | ||
2217 | static unsigned char * | |
2218 | add_traceframe_block (struct traceframe *tframe, int amt) | |
2219 | { | |
2220 | unsigned char *block; | |
2221 | ||
2222 | if (!tframe) | |
2223 | return NULL; | |
2224 | ||
2225 | block = trace_buffer_alloc (amt); | |
2226 | ||
2227 | if (!block) | |
2228 | return NULL; | |
2229 | ||
2230 | tframe->data_size += amt; | |
2231 | ||
2232 | return block; | |
2233 | } | |
2234 | ||
2235 | /* Flag that the current traceframe is finished. */ | |
2236 | ||
2237 | static void | |
2238 | finish_traceframe (struct traceframe *tframe) | |
2239 | { | |
2240 | ++traceframe_write_count; | |
2241 | ++traceframes_created; | |
2242 | } | |
2243 | ||
fa593d66 PA |
2244 | #ifndef IN_PROCESS_AGENT |
2245 | ||
219f2f23 PA |
2246 | /* Given a traceframe number NUM, find the NUMth traceframe in the |
2247 | buffer. */ | |
2248 | ||
2249 | static struct traceframe * | |
2250 | find_traceframe (int num) | |
2251 | { | |
2252 | struct traceframe *tframe; | |
2253 | int tfnum = 0; | |
2254 | ||
2255 | for (tframe = FIRST_TRACEFRAME (); | |
2256 | tframe->tpnum != 0; | |
2257 | tframe = NEXT_TRACEFRAME (tframe)) | |
2258 | { | |
2259 | if (tfnum == num) | |
2260 | return tframe; | |
2261 | ++tfnum; | |
2262 | } | |
2263 | ||
2264 | return NULL; | |
2265 | } | |
2266 | ||
2267 | static CORE_ADDR | |
2268 | get_traceframe_address (struct traceframe *tframe) | |
2269 | { | |
2270 | CORE_ADDR addr; | |
2271 | struct tracepoint *tpoint; | |
2272 | ||
2273 | addr = traceframe_get_pc (tframe); | |
2274 | ||
2275 | if (addr) | |
2276 | return addr; | |
2277 | ||
2278 | /* Fallback strategy, will be incorrect for while-stepping frames | |
2279 | and multi-location tracepoints. */ | |
2280 | tpoint = find_next_tracepoint_by_number (NULL, tframe->tpnum); | |
2281 | return tpoint->address; | |
2282 | } | |
2283 | ||
2284 | /* Search for the next traceframe whose address is inside or outside | |
2285 | the given range. */ | |
2286 | ||
2287 | static struct traceframe * | |
2288 | find_next_traceframe_in_range (CORE_ADDR lo, CORE_ADDR hi, int inside_p, | |
2289 | int *tfnump) | |
2290 | { | |
2291 | struct traceframe *tframe; | |
2292 | CORE_ADDR tfaddr; | |
2293 | ||
2294 | *tfnump = current_traceframe + 1; | |
2295 | tframe = find_traceframe (*tfnump); | |
2296 | /* The search is not supposed to wrap around. */ | |
2297 | if (!tframe) | |
2298 | { | |
2299 | *tfnump = -1; | |
2300 | return NULL; | |
2301 | } | |
2302 | ||
2303 | for (; tframe->tpnum != 0; tframe = NEXT_TRACEFRAME (tframe)) | |
2304 | { | |
2305 | tfaddr = get_traceframe_address (tframe); | |
2306 | if (inside_p | |
2307 | ? (lo <= tfaddr && tfaddr <= hi) | |
2308 | : (lo > tfaddr || tfaddr > hi)) | |
2309 | return tframe; | |
2310 | ++*tfnump; | |
2311 | } | |
2312 | ||
2313 | *tfnump = -1; | |
2314 | return NULL; | |
2315 | } | |
2316 | ||
2317 | /* Search for the next traceframe recorded by the given tracepoint. | |
2318 | Note that for multi-location tracepoints, this will find whatever | |
2319 | location appears first. */ | |
2320 | ||
2321 | static struct traceframe * | |
2322 | find_next_traceframe_by_tracepoint (int num, int *tfnump) | |
2323 | { | |
2324 | struct traceframe *tframe; | |
2325 | ||
2326 | *tfnump = current_traceframe + 1; | |
2327 | tframe = find_traceframe (*tfnump); | |
2328 | /* The search is not supposed to wrap around. */ | |
2329 | if (!tframe) | |
2330 | { | |
2331 | *tfnump = -1; | |
2332 | return NULL; | |
2333 | } | |
2334 | ||
2335 | for (; tframe->tpnum != 0; tframe = NEXT_TRACEFRAME (tframe)) | |
2336 | { | |
2337 | if (tframe->tpnum == num) | |
2338 | return tframe; | |
2339 | ++*tfnump; | |
2340 | } | |
2341 | ||
2342 | *tfnump = -1; | |
2343 | return NULL; | |
2344 | } | |
2345 | ||
fa593d66 PA |
2346 | #endif |
2347 | ||
2348 | #ifndef IN_PROCESS_AGENT | |
2349 | ||
219f2f23 PA |
2350 | /* Clear all past trace state. */ |
2351 | ||
2352 | static void | |
2353 | cmd_qtinit (char *packet) | |
2354 | { | |
2355 | struct trace_state_variable *tsv, *prev, *next; | |
2356 | ||
2357 | /* Make sure we don't try to read from a trace frame. */ | |
2358 | current_traceframe = -1; | |
2359 | ||
2360 | trace_debug ("Initializing the trace"); | |
2361 | ||
2362 | clear_installed_tracepoints (); | |
2363 | clear_readonly_regions (); | |
2364 | ||
2365 | tracepoints = NULL; | |
2366 | last_tracepoint = NULL; | |
2367 | ||
2368 | /* Clear out any leftover trace state variables. Ones with target | |
2369 | defined getters should be kept however. */ | |
2370 | prev = NULL; | |
2371 | tsv = trace_state_variables; | |
2372 | while (tsv) | |
2373 | { | |
2374 | trace_debug ("Looking at var %d", tsv->number); | |
2375 | if (tsv->getter == NULL) | |
2376 | { | |
2377 | next = tsv->next; | |
2378 | if (prev) | |
2379 | prev->next = next; | |
2380 | else | |
2381 | trace_state_variables = next; | |
2382 | trace_debug ("Deleting var %d", tsv->number); | |
2383 | free (tsv); | |
2384 | tsv = next; | |
2385 | } | |
2386 | else | |
2387 | { | |
2388 | prev = tsv; | |
2389 | tsv = tsv->next; | |
2390 | } | |
2391 | } | |
2392 | ||
2393 | clear_trace_buffer (); | |
fa593d66 | 2394 | clear_inferior_trace_buffer (); |
219f2f23 PA |
2395 | |
2396 | write_ok (packet); | |
2397 | } | |
2398 | ||
0fb4aa4b PA |
2399 | /* Unprobe the UST marker at ADDRESS. */ |
2400 | ||
2401 | static void | |
2402 | unprobe_marker_at (CORE_ADDR address) | |
2403 | { | |
2fa291ac | 2404 | char cmd[IPA_CMD_BUF_SIZE]; |
0fb4aa4b PA |
2405 | |
2406 | sprintf (cmd, "unprobe_marker_at:%s", paddress (address)); | |
42476b70 | 2407 | run_inferior_command (cmd, strlen (cmd) + 1); |
0fb4aa4b PA |
2408 | } |
2409 | ||
219f2f23 PA |
2410 | /* Restore the program to its pre-tracing state. This routine may be called |
2411 | in error situations, so it needs to be careful about only restoring | |
2412 | from known-valid bits. */ | |
2413 | ||
2414 | static void | |
2415 | clear_installed_tracepoints (void) | |
2416 | { | |
2417 | struct tracepoint *tpoint; | |
2418 | struct tracepoint *prev_stpoint; | |
2419 | ||
7984d532 PA |
2420 | pause_all (1); |
2421 | cancel_breakpoints (); | |
2422 | ||
219f2f23 PA |
2423 | prev_stpoint = NULL; |
2424 | ||
2425 | /* Restore any bytes overwritten by tracepoints. */ | |
2426 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
2427 | { | |
219f2f23 PA |
2428 | /* Catch the case where we might try to remove a tracepoint that |
2429 | was never actually installed. */ | |
2430 | if (tpoint->handle == NULL) | |
2431 | { | |
2432 | trace_debug ("Tracepoint %d at 0x%s was " | |
2433 | "never installed, nothing to clear", | |
2434 | tpoint->number, paddress (tpoint->address)); | |
2435 | continue; | |
2436 | } | |
2437 | ||
fa593d66 PA |
2438 | switch (tpoint->type) |
2439 | { | |
2440 | case trap_tracepoint: | |
2441 | delete_breakpoint (tpoint->handle); | |
2442 | break; | |
2443 | case fast_tracepoint: | |
2444 | delete_fast_tracepoint_jump (tpoint->handle); | |
2445 | break; | |
0fb4aa4b PA |
2446 | case static_tracepoint: |
2447 | if (prev_stpoint != NULL | |
2448 | && prev_stpoint->address == tpoint->address) | |
2449 | /* Nothing to do. We already unprobed a tracepoint set at | |
2450 | this marker address (and there can only be one probe | |
2451 | per marker). */ | |
2452 | ; | |
2453 | else | |
2454 | { | |
2455 | unprobe_marker_at (tpoint->address); | |
2456 | prev_stpoint = tpoint; | |
2457 | } | |
2458 | break; | |
fa593d66 PA |
2459 | } |
2460 | ||
219f2f23 PA |
2461 | tpoint->handle = NULL; |
2462 | } | |
7984d532 PA |
2463 | |
2464 | unpause_all (1); | |
219f2f23 PA |
2465 | } |
2466 | ||
2467 | /* Parse a packet that defines a tracepoint. */ | |
2468 | ||
2469 | static void | |
2470 | cmd_qtdp (char *own_buf) | |
2471 | { | |
2472 | int tppacket; | |
1e4d1764 YQ |
2473 | /* Whether there is a trailing hyphen at the end of the QTDP packet. */ |
2474 | int trail_hyphen = 0; | |
219f2f23 PA |
2475 | ULONGEST num; |
2476 | ULONGEST addr; | |
2477 | ULONGEST count; | |
2478 | struct tracepoint *tpoint; | |
2479 | char *actparm; | |
2480 | char *packet = own_buf; | |
2481 | ||
2482 | packet += strlen ("QTDP:"); | |
2483 | ||
2484 | /* A hyphen at the beginning marks a packet specifying actions for a | |
2485 | tracepoint already supplied. */ | |
2486 | tppacket = 1; | |
2487 | if (*packet == '-') | |
2488 | { | |
2489 | tppacket = 0; | |
2490 | ++packet; | |
2491 | } | |
2492 | packet = unpack_varlen_hex (packet, &num); | |
2493 | ++packet; /* skip a colon */ | |
2494 | packet = unpack_varlen_hex (packet, &addr); | |
2495 | ++packet; /* skip a colon */ | |
2496 | ||
2497 | /* See if we already have this tracepoint. */ | |
2498 | tpoint = find_tracepoint (num, addr); | |
2499 | ||
2500 | if (tppacket) | |
2501 | { | |
2502 | /* Duplicate tracepoints are never allowed. */ | |
2503 | if (tpoint) | |
2504 | { | |
2505 | trace_debug ("Tracepoint error: tracepoint %d" | |
2506 | " at 0x%s already exists", | |
2507 | (int) num, paddress (addr)); | |
2508 | write_enn (own_buf); | |
2509 | return; | |
2510 | } | |
2511 | ||
2512 | tpoint = add_tracepoint (num, addr); | |
2513 | ||
2514 | tpoint->enabled = (*packet == 'E'); | |
2515 | ++packet; /* skip 'E' */ | |
2516 | ++packet; /* skip a colon */ | |
2517 | packet = unpack_varlen_hex (packet, &count); | |
2518 | tpoint->step_count = count; | |
2519 | ++packet; /* skip a colon */ | |
2520 | packet = unpack_varlen_hex (packet, &count); | |
2521 | tpoint->pass_count = count; | |
2522 | /* See if we have any of the additional optional fields. */ | |
2523 | while (*packet == ':') | |
2524 | { | |
2525 | ++packet; | |
fa593d66 PA |
2526 | if (*packet == 'F') |
2527 | { | |
2528 | tpoint->type = fast_tracepoint; | |
2529 | ++packet; | |
2530 | packet = unpack_varlen_hex (packet, &count); | |
2531 | tpoint->orig_size = count; | |
2532 | } | |
0fb4aa4b PA |
2533 | else if (*packet == 'S') |
2534 | { | |
2535 | tpoint->type = static_tracepoint; | |
2536 | ++packet; | |
2537 | } | |
fa593d66 | 2538 | else if (*packet == 'X') |
219f2f23 PA |
2539 | { |
2540 | actparm = (char *) packet; | |
5e1dc496 | 2541 | tpoint->cond = gdb_parse_agent_expr (&actparm); |
219f2f23 PA |
2542 | packet = actparm; |
2543 | } | |
2544 | else if (*packet == '-') | |
2545 | break; | |
2546 | else if (*packet == '\0') | |
2547 | break; | |
2548 | else | |
2549 | trace_debug ("Unknown optional tracepoint field"); | |
2550 | } | |
2551 | if (*packet == '-') | |
1e4d1764 YQ |
2552 | { |
2553 | trail_hyphen = 1; | |
2554 | trace_debug ("Also has actions\n"); | |
2555 | } | |
219f2f23 | 2556 | |
fa593d66 | 2557 | trace_debug ("Defined %stracepoint %d at 0x%s, " |
5f18041e | 2558 | "enabled %d step %" PRIu64 " pass %" PRIu64, |
fa593d66 | 2559 | tpoint->type == fast_tracepoint ? "fast " |
5e0a92a9 | 2560 | : tpoint->type == static_tracepoint ? "static " : "", |
fa593d66 | 2561 | tpoint->number, paddress (tpoint->address), tpoint->enabled, |
219f2f23 PA |
2562 | tpoint->step_count, tpoint->pass_count); |
2563 | } | |
2564 | else if (tpoint) | |
2565 | add_tracepoint_action (tpoint, packet); | |
2566 | else | |
2567 | { | |
2568 | trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found", | |
2569 | (int) num, paddress (addr)); | |
2570 | write_enn (own_buf); | |
2571 | return; | |
2572 | } | |
2573 | ||
1e4d1764 YQ |
2574 | /* Install tracepoint during tracing only once for each tracepoint location. |
2575 | For each tracepoint loc, GDB may send multiple QTDP packets, and we can | |
2576 | determine the last QTDP packet for one tracepoint location by checking | |
2577 | trailing hyphen in QTDP packet. */ | |
2578 | if (tracing && !trail_hyphen) | |
2579 | { | |
fc3e5175 YQ |
2580 | struct tracepoint *tp = NULL; |
2581 | ||
1e4d1764 YQ |
2582 | /* Pause all threads temporarily while we patch tracepoints. */ |
2583 | pause_all (0); | |
2584 | ||
2585 | /* download_tracepoint will update global `tracepoints' | |
2586 | list, so it is unsafe to leave threads in jump pad. */ | |
2587 | stabilize_threads (); | |
2588 | ||
2589 | /* Freeze threads. */ | |
2590 | pause_all (1); | |
2591 | ||
fc3e5175 YQ |
2592 | |
2593 | if (tpoint->type != trap_tracepoint) | |
2594 | { | |
2595 | /* Find another fast or static tracepoint at the same address. */ | |
2596 | for (tp = tracepoints; tp; tp = tp->next) | |
2597 | { | |
2598 | if (tp->address == tpoint->address && tp->type == tpoint->type | |
2599 | && tp->number != tpoint->number) | |
2600 | break; | |
2601 | } | |
2602 | ||
2603 | /* TPOINT is installed at the same address as TP. */ | |
2604 | if (tp) | |
2605 | { | |
2606 | if (tpoint->type == fast_tracepoint) | |
2607 | clone_fast_tracepoint (tpoint, tp); | |
2608 | else if (tpoint->type == static_tracepoint) | |
2609 | tpoint->handle = (void *) -1; | |
2610 | } | |
2611 | } | |
2612 | ||
42476b70 YQ |
2613 | if (use_agent && tpoint->type == fast_tracepoint |
2614 | && agent_capability_check (AGENT_CAPA_FAST_TRACE)) | |
fc3e5175 | 2615 | { |
42476b70 YQ |
2616 | /* Download and install fast tracepoint by agent. */ |
2617 | if (tracepoint_send_agent (tpoint) == 0) | |
2618 | write_ok (own_buf); | |
2619 | else | |
2620 | { | |
2621 | write_enn (own_buf); | |
2622 | remove_tracepoint (tpoint); | |
2623 | } | |
fc3e5175 YQ |
2624 | } |
2625 | else | |
42476b70 YQ |
2626 | { |
2627 | download_tracepoint (tpoint); | |
2628 | ||
2629 | if (tpoint->type == trap_tracepoint || tp == NULL) | |
2630 | { | |
2631 | install_tracepoint (tpoint, own_buf); | |
2632 | if (strcmp (own_buf, "OK") != 0) | |
2633 | remove_tracepoint (tpoint); | |
2634 | } | |
2635 | else | |
2636 | write_ok (own_buf); | |
2637 | } | |
1e4d1764 YQ |
2638 | |
2639 | unpause_all (1); | |
2640 | return; | |
2641 | } | |
2642 | ||
219f2f23 PA |
2643 | write_ok (own_buf); |
2644 | } | |
2645 | ||
2646 | static void | |
2647 | cmd_qtdpsrc (char *own_buf) | |
2648 | { | |
2649 | ULONGEST num, addr, start, slen; | |
2650 | struct tracepoint *tpoint; | |
2651 | char *packet = own_buf; | |
2652 | char *saved, *srctype, *src; | |
2653 | size_t nbytes; | |
2654 | struct source_string *last, *newlast; | |
2655 | ||
2656 | packet += strlen ("QTDPsrc:"); | |
2657 | ||
2658 | packet = unpack_varlen_hex (packet, &num); | |
2659 | ++packet; /* skip a colon */ | |
2660 | packet = unpack_varlen_hex (packet, &addr); | |
2661 | ++packet; /* skip a colon */ | |
2662 | ||
2663 | /* See if we already have this tracepoint. */ | |
2664 | tpoint = find_tracepoint (num, addr); | |
2665 | ||
2666 | if (!tpoint) | |
2667 | { | |
2668 | trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found", | |
2669 | (int) num, paddress (addr)); | |
2670 | write_enn (own_buf); | |
2671 | return; | |
2672 | } | |
2673 | ||
2674 | saved = packet; | |
2675 | packet = strchr (packet, ':'); | |
2676 | srctype = xmalloc (packet - saved + 1); | |
2677 | memcpy (srctype, saved, packet - saved); | |
2678 | srctype[packet - saved] = '\0'; | |
2679 | ++packet; | |
2680 | packet = unpack_varlen_hex (packet, &start); | |
2681 | ++packet; /* skip a colon */ | |
2682 | packet = unpack_varlen_hex (packet, &slen); | |
2683 | ++packet; /* skip a colon */ | |
2684 | src = xmalloc (slen + 1); | |
2685 | nbytes = unhexify (src, packet, strlen (packet) / 2); | |
2686 | src[nbytes] = '\0'; | |
2687 | ||
2688 | newlast = xmalloc (sizeof (struct source_string)); | |
2689 | newlast->type = srctype; | |
2690 | newlast->str = src; | |
2691 | newlast->next = NULL; | |
2692 | /* Always add a source string to the end of the list; | |
2693 | this keeps sequences of actions/commands in the right | |
2694 | order. */ | |
2695 | if (tpoint->source_strings) | |
2696 | { | |
2697 | for (last = tpoint->source_strings; last->next; last = last->next) | |
2698 | ; | |
2699 | last->next = newlast; | |
2700 | } | |
2701 | else | |
2702 | tpoint->source_strings = newlast; | |
2703 | ||
2704 | write_ok (own_buf); | |
2705 | } | |
2706 | ||
2707 | static void | |
2708 | cmd_qtdv (char *own_buf) | |
2709 | { | |
2710 | ULONGEST num, val, builtin; | |
2711 | char *varname; | |
2712 | size_t nbytes; | |
2713 | struct trace_state_variable *tsv; | |
2714 | char *packet = own_buf; | |
2715 | ||
2716 | packet += strlen ("QTDV:"); | |
2717 | ||
2718 | packet = unpack_varlen_hex (packet, &num); | |
2719 | ++packet; /* skip a colon */ | |
2720 | packet = unpack_varlen_hex (packet, &val); | |
2721 | ++packet; /* skip a colon */ | |
2722 | packet = unpack_varlen_hex (packet, &builtin); | |
2723 | ++packet; /* skip a colon */ | |
2724 | ||
2725 | nbytes = strlen (packet) / 2; | |
2726 | varname = xmalloc (nbytes + 1); | |
2727 | nbytes = unhexify (varname, packet, nbytes); | |
2728 | varname[nbytes] = '\0'; | |
2729 | ||
fa593d66 | 2730 | tsv = create_trace_state_variable (num, 1); |
219f2f23 PA |
2731 | tsv->initial_value = (LONGEST) val; |
2732 | tsv->name = varname; | |
2733 | ||
2734 | set_trace_state_variable_value (num, (LONGEST) val); | |
2735 | ||
2736 | write_ok (own_buf); | |
2737 | } | |
2738 | ||
d248b706 KY |
2739 | static void |
2740 | cmd_qtenable_disable (char *own_buf, int enable) | |
2741 | { | |
2742 | char *packet = own_buf; | |
2743 | ULONGEST num, addr; | |
2744 | struct tracepoint *tp; | |
2745 | ||
2746 | packet += strlen (enable ? "QTEnable:" : "QTDisable:"); | |
2747 | packet = unpack_varlen_hex (packet, &num); | |
2748 | ++packet; /* skip a colon */ | |
2749 | packet = unpack_varlen_hex (packet, &addr); | |
2750 | ||
2751 | tp = find_tracepoint (num, addr); | |
2752 | ||
2753 | if (tp) | |
2754 | { | |
2755 | if ((enable && tp->enabled) || (!enable && !tp->enabled)) | |
2756 | { | |
2757 | trace_debug ("Tracepoint %d at 0x%s is already %s", | |
2758 | (int) num, paddress (addr), | |
2759 | enable ? "enabled" : "disabled"); | |
2760 | write_ok (own_buf); | |
2761 | return; | |
2762 | } | |
2763 | ||
2764 | trace_debug ("%s tracepoint %d at 0x%s", | |
2765 | enable ? "Enabling" : "Disabling", | |
2766 | (int) num, paddress (addr)); | |
2767 | ||
2768 | tp->enabled = enable; | |
2769 | ||
2770 | if (tp->type == fast_tracepoint || tp->type == static_tracepoint) | |
2771 | { | |
2772 | int ret; | |
2773 | int offset = offsetof (struct tracepoint, enabled); | |
2774 | CORE_ADDR obj_addr = tp->obj_addr_on_target + offset; | |
2775 | ||
2776 | ret = prepare_to_access_memory (); | |
2777 | if (ret) | |
2778 | { | |
2779 | trace_debug ("Failed to temporarily stop inferior threads"); | |
2780 | write_enn (own_buf); | |
2781 | return; | |
2782 | } | |
2783 | ||
2784 | ret = write_inferior_integer (obj_addr, enable); | |
2785 | done_accessing_memory (); | |
2786 | ||
2787 | if (ret) | |
2788 | { | |
2789 | trace_debug ("Cannot write enabled flag into " | |
2790 | "inferior process memory"); | |
2791 | write_enn (own_buf); | |
2792 | return; | |
2793 | } | |
2794 | } | |
2795 | ||
2796 | write_ok (own_buf); | |
2797 | } | |
2798 | else | |
2799 | { | |
2800 | trace_debug ("Tracepoint %d at 0x%s not found", | |
2801 | (int) num, paddress (addr)); | |
2802 | write_enn (own_buf); | |
2803 | } | |
2804 | } | |
2805 | ||
219f2f23 PA |
2806 | static void |
2807 | cmd_qtv (char *own_buf) | |
2808 | { | |
2809 | ULONGEST num; | |
2810 | LONGEST val; | |
2811 | int err; | |
2812 | char *packet = own_buf; | |
2813 | ||
2814 | packet += strlen ("qTV:"); | |
f8f67713 | 2815 | unpack_varlen_hex (packet, &num); |
219f2f23 PA |
2816 | |
2817 | if (current_traceframe >= 0) | |
2818 | { | |
2819 | err = traceframe_read_tsv ((int) num, &val); | |
2820 | if (err) | |
2821 | { | |
2822 | strcpy (own_buf, "U"); | |
2823 | return; | |
2824 | } | |
2825 | } | |
2826 | /* Only make tsv's be undefined before the first trace run. After a | |
2827 | trace run is over, the user might want to see the last value of | |
2828 | the tsv, and it might not be available in a traceframe. */ | |
2829 | else if (!tracing && strcmp (tracing_stop_reason, "tnotrun") == 0) | |
2830 | { | |
2831 | strcpy (own_buf, "U"); | |
2832 | return; | |
2833 | } | |
2834 | else | |
2835 | val = get_trace_state_variable_value (num); | |
2836 | ||
2837 | sprintf (own_buf, "V%s", phex_nz (val, 0)); | |
2838 | } | |
2839 | ||
2840 | /* Clear out the list of readonly regions. */ | |
2841 | ||
2842 | static void | |
2843 | clear_readonly_regions (void) | |
2844 | { | |
2845 | struct readonly_region *roreg; | |
2846 | ||
2847 | while (readonly_regions) | |
2848 | { | |
2849 | roreg = readonly_regions; | |
2850 | readonly_regions = readonly_regions->next; | |
2851 | free (roreg); | |
2852 | } | |
2853 | } | |
2854 | ||
2855 | /* Parse the collection of address ranges whose contents GDB believes | |
2856 | to be unchanging and so can be read directly from target memory | |
2857 | even while looking at a traceframe. */ | |
2858 | ||
2859 | static void | |
2860 | cmd_qtro (char *own_buf) | |
2861 | { | |
2862 | ULONGEST start, end; | |
2863 | struct readonly_region *roreg; | |
2864 | char *packet = own_buf; | |
2865 | ||
2866 | trace_debug ("Want to mark readonly regions"); | |
2867 | ||
2868 | clear_readonly_regions (); | |
2869 | ||
2870 | packet += strlen ("QTro"); | |
2871 | ||
2872 | while (*packet == ':') | |
2873 | { | |
2874 | ++packet; /* skip a colon */ | |
2875 | packet = unpack_varlen_hex (packet, &start); | |
2876 | ++packet; /* skip a comma */ | |
2877 | packet = unpack_varlen_hex (packet, &end); | |
2878 | roreg = xmalloc (sizeof (struct readonly_region)); | |
2879 | roreg->start = start; | |
2880 | roreg->end = end; | |
2881 | roreg->next = readonly_regions; | |
2882 | readonly_regions = roreg; | |
2883 | trace_debug ("Added readonly region from 0x%s to 0x%s", | |
2884 | paddress (roreg->start), paddress (roreg->end)); | |
2885 | } | |
2886 | ||
2887 | write_ok (own_buf); | |
2888 | } | |
2889 | ||
2890 | /* Test to see if the given range is in our list of readonly ranges. | |
2891 | We only test for being entirely within a range, GDB is not going to | |
2892 | send a single memory packet that spans multiple regions. */ | |
2893 | ||
2894 | int | |
2895 | in_readonly_region (CORE_ADDR addr, ULONGEST length) | |
2896 | { | |
2897 | struct readonly_region *roreg; | |
2898 | ||
2899 | for (roreg = readonly_regions; roreg; roreg = roreg->next) | |
2900 | if (roreg->start <= addr && (addr + length - 1) <= roreg->end) | |
2901 | return 1; | |
2902 | ||
2903 | return 0; | |
2904 | } | |
2905 | ||
fa593d66 PA |
2906 | /* The maximum size of a jump pad entry. */ |
2907 | static const int max_jump_pad_size = 0x100; | |
2908 | ||
2909 | static CORE_ADDR gdb_jump_pad_head; | |
2910 | ||
2911 | /* Return the address of the next free jump space. */ | |
2912 | ||
2913 | static CORE_ADDR | |
2914 | get_jump_space_head (void) | |
2915 | { | |
2916 | if (gdb_jump_pad_head == 0) | |
2917 | { | |
2918 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer, | |
2919 | &gdb_jump_pad_head)) | |
2920 | fatal ("error extracting jump_pad_buffer"); | |
2921 | } | |
2922 | ||
2923 | return gdb_jump_pad_head; | |
2924 | } | |
2925 | ||
2926 | /* Reserve USED bytes from the jump space. */ | |
2927 | ||
2928 | static void | |
2929 | claim_jump_space (ULONGEST used) | |
2930 | { | |
2931 | trace_debug ("claim_jump_space reserves %s bytes at %s", | |
2932 | pulongest (used), paddress (gdb_jump_pad_head)); | |
2933 | gdb_jump_pad_head += used; | |
2934 | } | |
2935 | ||
405f8e94 SS |
2936 | static CORE_ADDR trampoline_buffer_head = 0; |
2937 | static CORE_ADDR trampoline_buffer_tail; | |
2938 | ||
2939 | /* Reserve USED bytes from the trampoline buffer and return the | |
2940 | address of the start of the reserved space in TRAMPOLINE. Returns | |
2941 | non-zero if the space is successfully claimed. */ | |
2942 | ||
2943 | int | |
2944 | claim_trampoline_space (ULONGEST used, CORE_ADDR *trampoline) | |
2945 | { | |
2946 | if (!trampoline_buffer_head) | |
2947 | { | |
2948 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer, | |
2949 | &trampoline_buffer_tail)) | |
2950 | { | |
2951 | fatal ("error extracting trampoline_buffer"); | |
2952 | return 0; | |
2953 | } | |
2954 | ||
2955 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_end, | |
2956 | &trampoline_buffer_head)) | |
2957 | { | |
2958 | fatal ("error extracting trampoline_buffer_end"); | |
2959 | return 0; | |
2960 | } | |
2961 | } | |
2962 | ||
2963 | /* Start claiming space from the top of the trampoline space. If | |
2964 | the space is located at the bottom of the virtual address space, | |
2965 | this reduces the possibility that corruption will occur if a null | |
2966 | pointer is used to write to memory. */ | |
2967 | if (trampoline_buffer_head - trampoline_buffer_tail < used) | |
2968 | { | |
2969 | trace_debug ("claim_trampoline_space failed to reserve %s bytes", | |
2970 | pulongest (used)); | |
2971 | return 0; | |
2972 | } | |
2973 | ||
2974 | trampoline_buffer_head -= used; | |
2975 | ||
2976 | trace_debug ("claim_trampoline_space reserves %s bytes at %s", | |
2977 | pulongest (used), paddress (trampoline_buffer_head)); | |
2978 | ||
2979 | *trampoline = trampoline_buffer_head; | |
2980 | return 1; | |
2981 | } | |
2982 | ||
2983 | /* Returns non-zero if there is space allocated for use in trampolines | |
2984 | for fast tracepoints. */ | |
2985 | ||
2986 | int | |
2987 | have_fast_tracepoint_trampoline_buffer (char *buf) | |
2988 | { | |
2989 | CORE_ADDR trampoline_end, errbuf; | |
2990 | ||
2991 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_end, | |
2992 | &trampoline_end)) | |
2993 | { | |
2994 | fatal ("error extracting trampoline_buffer_end"); | |
2995 | return 0; | |
2996 | } | |
2997 | ||
2998 | if (buf) | |
2999 | { | |
3000 | buf[0] = '\0'; | |
3001 | strcpy (buf, "was claiming"); | |
3002 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_error, | |
3003 | &errbuf)) | |
3004 | { | |
3005 | fatal ("error extracting errbuf"); | |
3006 | return 0; | |
3007 | } | |
3008 | ||
3009 | read_inferior_memory (errbuf, (unsigned char *) buf, 100); | |
3010 | } | |
3011 | ||
3012 | return trampoline_end != 0; | |
3013 | } | |
3014 | ||
0fb4aa4b PA |
3015 | /* Ask the IPA to probe the marker at ADDRESS. Returns -1 if running |
3016 | the command fails, or 0 otherwise. If the command ran | |
3017 | successfully, but probing the marker failed, ERROUT will be filled | |
3018 | with the error to reply to GDB, and -1 is also returned. This | |
3019 | allows directly passing IPA errors to GDB. */ | |
3020 | ||
3021 | static int | |
3022 | probe_marker_at (CORE_ADDR address, char *errout) | |
3023 | { | |
2fa291ac | 3024 | char cmd[IPA_CMD_BUF_SIZE]; |
0fb4aa4b PA |
3025 | int err; |
3026 | ||
3027 | sprintf (cmd, "probe_marker_at:%s", paddress (address)); | |
42476b70 | 3028 | err = run_inferior_command (cmd, strlen (cmd) + 1); |
0fb4aa4b PA |
3029 | |
3030 | if (err == 0) | |
3031 | { | |
3032 | if (*cmd == 'E') | |
3033 | { | |
3034 | strcpy (errout, cmd); | |
3035 | return -1; | |
3036 | } | |
3037 | } | |
3038 | ||
3039 | return err; | |
3040 | } | |
3041 | ||
219f2f23 | 3042 | static void |
5c73ff4e | 3043 | clone_fast_tracepoint (struct tracepoint *to, const struct tracepoint *from) |
219f2f23 | 3044 | { |
5c73ff4e YQ |
3045 | to->jump_pad = from->jump_pad; |
3046 | to->jump_pad_end = from->jump_pad_end; | |
405f8e94 SS |
3047 | to->trampoline = from->trampoline; |
3048 | to->trampoline_end = from->trampoline_end; | |
5c73ff4e YQ |
3049 | to->adjusted_insn_addr = from->adjusted_insn_addr; |
3050 | to->adjusted_insn_addr_end = from->adjusted_insn_addr_end; | |
3051 | to->handle = from->handle; | |
fa593d66 | 3052 | |
5c73ff4e YQ |
3053 | gdb_assert (from->handle); |
3054 | inc_ref_fast_tracepoint_jump ((struct fast_tracepoint_jump *) from->handle); | |
3055 | } | |
3056 | ||
3057 | #define MAX_JUMP_SIZE 20 | |
3058 | ||
3059 | /* Install fast tracepoint. Return 0 if successful, otherwise return | |
3060 | non-zero. */ | |
3061 | ||
3062 | static int | |
405f8e94 | 3063 | install_fast_tracepoint (struct tracepoint *tpoint, char *errbuf) |
5c73ff4e YQ |
3064 | { |
3065 | CORE_ADDR jentry, jump_entry; | |
405f8e94 SS |
3066 | CORE_ADDR trampoline; |
3067 | ULONGEST trampoline_size; | |
5c73ff4e | 3068 | int err = 0; |
fa593d66 PA |
3069 | /* The jump to the jump pad of the last fast tracepoint |
3070 | installed. */ | |
3071 | unsigned char fjump[MAX_JUMP_SIZE]; | |
3072 | ULONGEST fjump_size; | |
219f2f23 | 3073 | |
405f8e94 SS |
3074 | if (tpoint->orig_size < target_get_min_fast_tracepoint_insn_len ()) |
3075 | { | |
3076 | trace_debug ("Requested a fast tracepoint on an instruction " | |
3077 | "that is of less than the minimum length."); | |
3078 | return 0; | |
3079 | } | |
3080 | ||
5c73ff4e YQ |
3081 | jentry = jump_entry = get_jump_space_head (); |
3082 | ||
405f8e94 SS |
3083 | trampoline = 0; |
3084 | trampoline_size = 0; | |
3085 | ||
5c73ff4e YQ |
3086 | /* Install the jump pad. */ |
3087 | err = install_fast_tracepoint_jump_pad (tpoint->obj_addr_on_target, | |
3088 | tpoint->address, | |
3089 | ipa_sym_addrs.addr_gdb_collect, | |
3090 | ipa_sym_addrs.addr_collecting, | |
3091 | tpoint->orig_size, | |
405f8e94 SS |
3092 | &jentry, |
3093 | &trampoline, &trampoline_size, | |
3094 | fjump, &fjump_size, | |
5c73ff4e | 3095 | &tpoint->adjusted_insn_addr, |
405f8e94 SS |
3096 | &tpoint->adjusted_insn_addr_end, |
3097 | errbuf); | |
5c73ff4e YQ |
3098 | |
3099 | if (err) | |
3100 | return 1; | |
3101 | ||
3102 | /* Wire it in. */ | |
3103 | tpoint->handle = set_fast_tracepoint_jump (tpoint->address, fjump, | |
3104 | fjump_size); | |
3105 | ||
3106 | if (tpoint->handle != NULL) | |
3107 | { | |
3108 | tpoint->jump_pad = jump_entry; | |
3109 | tpoint->jump_pad_end = jentry; | |
405f8e94 SS |
3110 | tpoint->trampoline = trampoline; |
3111 | tpoint->trampoline_end = trampoline + trampoline_size; | |
5c73ff4e YQ |
3112 | |
3113 | /* Pad to 8-byte alignment. */ | |
3114 | jentry = ((jentry + 7) & ~0x7); | |
3115 | claim_jump_space (jentry - jump_entry); | |
3116 | } | |
3117 | ||
3118 | return 0; | |
3119 | } | |
3120 | ||
1e4d1764 YQ |
3121 | |
3122 | /* Install tracepoint TPOINT, and write reply message in OWN_BUF. */ | |
3123 | ||
3124 | static void | |
3125 | install_tracepoint (struct tracepoint *tpoint, char *own_buf) | |
3126 | { | |
3127 | tpoint->handle = NULL; | |
3128 | *own_buf = '\0'; | |
3129 | ||
3130 | if (tpoint->type == trap_tracepoint) | |
3131 | { | |
3132 | /* Tracepoints are installed as memory breakpoints. Just go | |
3133 | ahead and install the trap. The breakpoints module | |
3134 | handles duplicated breakpoints, and the memory read | |
3135 | routine handles un-patching traps from memory reads. */ | |
3136 | tpoint->handle = set_breakpoint_at (tpoint->address, | |
3137 | tracepoint_handler); | |
3138 | } | |
3139 | else if (tpoint->type == fast_tracepoint || tpoint->type == static_tracepoint) | |
3140 | { | |
58b4daa5 | 3141 | if (!agent_loaded_p ()) |
1e4d1764 YQ |
3142 | { |
3143 | trace_debug ("Requested a %s tracepoint, but fast " | |
3144 | "tracepoints aren't supported.", | |
3145 | tpoint->type == static_tracepoint ? "static" : "fast"); | |
3146 | write_e_ipa_not_loaded (own_buf); | |
3147 | return; | |
3148 | } | |
8ffcbaaf YQ |
3149 | if (tpoint->type == static_tracepoint |
3150 | && !in_process_agent_supports_ust ()) | |
1e4d1764 YQ |
3151 | { |
3152 | trace_debug ("Requested a static tracepoint, but static " | |
3153 | "tracepoints are not supported."); | |
3154 | write_e_ust_not_loaded (own_buf); | |
3155 | return; | |
3156 | } | |
3157 | ||
1e4d1764 | 3158 | if (tpoint->type == fast_tracepoint) |
fc3e5175 | 3159 | install_fast_tracepoint (tpoint, own_buf); |
1e4d1764 YQ |
3160 | else |
3161 | { | |
fc3e5175 | 3162 | if (probe_marker_at (tpoint->address, own_buf) == 0) |
1e4d1764 | 3163 | tpoint->handle = (void *) -1; |
1e4d1764 YQ |
3164 | } |
3165 | ||
3166 | } | |
3167 | else | |
3168 | internal_error (__FILE__, __LINE__, "Unknown tracepoint type"); | |
3169 | ||
3170 | if (tpoint->handle == NULL) | |
3171 | { | |
3172 | if (*own_buf == '\0') | |
3173 | write_enn (own_buf); | |
3174 | } | |
3175 | else | |
3176 | write_ok (own_buf); | |
3177 | } | |
3178 | ||
7bc83639 YQ |
3179 | static void download_tracepoint_1 (struct tracepoint *tpoint); |
3180 | ||
5c73ff4e YQ |
3181 | static void |
3182 | cmd_qtstart (char *packet) | |
3183 | { | |
3184 | struct tracepoint *tpoint, *prev_ftpoint, *prev_stpoint; | |
7bc83639 | 3185 | CORE_ADDR tpptr = 0, prev_tpptr = 0; |
5c73ff4e | 3186 | |
219f2f23 PA |
3187 | trace_debug ("Starting the trace"); |
3188 | ||
7984d532 | 3189 | /* Pause all threads temporarily while we patch tracepoints. */ |
fa593d66 PA |
3190 | pause_all (0); |
3191 | ||
3192 | /* Get threads out of jump pads. Safe to do here, since this is a | |
3193 | top level command. And, required to do here, since we're | |
3194 | deleting/rewriting jump pads. */ | |
3195 | ||
3196 | stabilize_threads (); | |
3197 | ||
3198 | /* Freeze threads. */ | |
7984d532 PA |
3199 | pause_all (1); |
3200 | ||
fa593d66 | 3201 | /* Sync the fast tracepoints list in the inferior ftlib. */ |
58b4daa5 | 3202 | if (agent_loaded_p ()) |
7bc83639 | 3203 | download_trace_state_variables (); |
fa593d66 PA |
3204 | |
3205 | /* No previous fast tpoint yet. */ | |
3206 | prev_ftpoint = NULL; | |
3207 | ||
0fb4aa4b PA |
3208 | /* No previous static tpoint yet. */ |
3209 | prev_stpoint = NULL; | |
3210 | ||
fa593d66 PA |
3211 | *packet = '\0'; |
3212 | ||
7bc83639 YQ |
3213 | /* Start out empty. */ |
3214 | if (agent_loaded_p ()) | |
3215 | write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints, 0); | |
3216 | ||
3217 | /* Download and install tracepoints. */ | |
219f2f23 PA |
3218 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) |
3219 | { | |
3220 | /* Ensure all the hit counts start at zero. */ | |
3221 | tpoint->hit_count = 0; | |
f196051f | 3222 | tpoint->traceframe_usage = 0; |
219f2f23 | 3223 | |
fa593d66 PA |
3224 | if (tpoint->type == trap_tracepoint) |
3225 | { | |
fa593d66 PA |
3226 | /* Tracepoints are installed as memory breakpoints. Just go |
3227 | ahead and install the trap. The breakpoints module | |
3228 | handles duplicated breakpoints, and the memory read | |
3229 | routine handles un-patching traps from memory reads. */ | |
3230 | tpoint->handle = set_breakpoint_at (tpoint->address, | |
3231 | tracepoint_handler); | |
3232 | } | |
7bc83639 YQ |
3233 | else if (tpoint->type == fast_tracepoint |
3234 | || tpoint->type == static_tracepoint) | |
fa593d66 | 3235 | { |
fa593d66 PA |
3236 | if (maybe_write_ipa_not_loaded (packet)) |
3237 | { | |
7bc83639 YQ |
3238 | trace_debug ("Requested a %s tracepoint, but fast " |
3239 | "tracepoints aren't supported.", | |
3240 | tpoint->type == static_tracepoint | |
3241 | ? "static" : "fast"); | |
fa593d66 PA |
3242 | break; |
3243 | } | |
3244 | ||
7bc83639 | 3245 | if (tpoint->type == fast_tracepoint) |
0fb4aa4b | 3246 | { |
7bc83639 YQ |
3247 | if (prev_ftpoint != NULL |
3248 | && prev_ftpoint->address == tpoint->address) | |
3249 | clone_fast_tracepoint (tpoint, prev_ftpoint); | |
3250 | else | |
3251 | { | |
42476b70 YQ |
3252 | /* Tracepoint is installed successfully? */ |
3253 | int installed = 0; | |
3254 | ||
3255 | /* Download and install fast tracepoint by agent. */ | |
3256 | if (use_agent | |
3257 | && agent_capability_check (AGENT_CAPA_FAST_TRACE)) | |
3258 | installed = !tracepoint_send_agent (tpoint); | |
3259 | else | |
3260 | { | |
3261 | download_tracepoint_1 (tpoint); | |
3262 | installed = !install_fast_tracepoint (tpoint, packet); | |
3263 | } | |
3264 | ||
3265 | if (installed) | |
7bc83639 YQ |
3266 | prev_ftpoint = tpoint; |
3267 | } | |
0fb4aa4b PA |
3268 | } |
3269 | else | |
3270 | { | |
7bc83639 | 3271 | if (!in_process_agent_supports_ust ()) |
0fb4aa4b | 3272 | { |
7bc83639 YQ |
3273 | trace_debug ("Requested a static tracepoint, but static " |
3274 | "tracepoints are not supported."); | |
3275 | break; | |
3276 | } | |
0fb4aa4b | 3277 | |
7bc83639 YQ |
3278 | download_tracepoint_1 (tpoint); |
3279 | /* Can only probe a given marker once. */ | |
3280 | if (prev_stpoint != NULL | |
3281 | && prev_stpoint->address == tpoint->address) | |
3282 | tpoint->handle = (void *) -1; | |
3283 | else | |
3284 | { | |
3285 | if (probe_marker_at (tpoint->address, packet) == 0) | |
3286 | { | |
3287 | tpoint->handle = (void *) -1; | |
3288 | ||
3289 | /* So that we can handle multiple static tracepoints | |
3290 | at the same address easily. */ | |
3291 | prev_stpoint = tpoint; | |
3292 | } | |
0fb4aa4b PA |
3293 | } |
3294 | } | |
7bc83639 YQ |
3295 | |
3296 | prev_tpptr = tpptr; | |
3297 | tpptr = tpoint->obj_addr_on_target; | |
3298 | ||
3299 | if (tpoint == tracepoints) | |
3300 | /* First object in list, set the head pointer in the | |
3301 | inferior. */ | |
3302 | write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints, tpptr); | |
3303 | else | |
3304 | write_inferior_data_ptr (prev_tpptr + offsetof (struct tracepoint, | |
3305 | next), | |
3306 | tpptr); | |
0fb4aa4b | 3307 | } |
fa593d66 PA |
3308 | |
3309 | /* Any failure in the inner loop is sufficient cause to give | |
3310 | up. */ | |
219f2f23 PA |
3311 | if (tpoint->handle == NULL) |
3312 | break; | |
3313 | } | |
3314 | ||
3315 | /* Any error in tracepoint insertion is unacceptable; better to | |
3316 | address the problem now, than end up with a useless or misleading | |
3317 | trace run. */ | |
3318 | if (tpoint != NULL) | |
3319 | { | |
3320 | clear_installed_tracepoints (); | |
3321 | if (*packet == '\0') | |
3322 | write_enn (packet); | |
7984d532 | 3323 | unpause_all (1); |
219f2f23 PA |
3324 | return; |
3325 | } | |
3326 | ||
3327 | stopping_tracepoint = NULL; | |
3328 | trace_buffer_is_full = 0; | |
3329 | expr_eval_result = expr_eval_no_error; | |
3330 | error_tracepoint = NULL; | |
f196051f | 3331 | tracing_start_time = get_timestamp (); |
219f2f23 PA |
3332 | |
3333 | /* Tracing is now active, hits will now start being logged. */ | |
3334 | tracing = 1; | |
3335 | ||
58b4daa5 | 3336 | if (agent_loaded_p ()) |
fa593d66 PA |
3337 | { |
3338 | if (write_inferior_integer (ipa_sym_addrs.addr_tracing, 1)) | |
3339 | fatal ("Error setting tracing variable in lib"); | |
3340 | ||
3341 | if (write_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, | |
3342 | 0)) | |
3343 | fatal ("Error clearing stopping_tracepoint variable in lib"); | |
3344 | ||
3345 | if (write_inferior_integer (ipa_sym_addrs.addr_trace_buffer_is_full, 0)) | |
3346 | fatal ("Error clearing trace_buffer_is_full variable in lib"); | |
3347 | ||
3348 | stop_tracing_bkpt = set_breakpoint_at (ipa_sym_addrs.addr_stop_tracing, | |
3349 | stop_tracing_handler); | |
3350 | if (stop_tracing_bkpt == NULL) | |
3351 | error ("Error setting stop_tracing breakpoint"); | |
3352 | ||
3353 | flush_trace_buffer_bkpt | |
3354 | = set_breakpoint_at (ipa_sym_addrs.addr_flush_trace_buffer, | |
3355 | flush_trace_buffer_handler); | |
3356 | if (flush_trace_buffer_bkpt == NULL) | |
3357 | error ("Error setting flush_trace_buffer breakpoint"); | |
3358 | } | |
3359 | ||
7984d532 PA |
3360 | unpause_all (1); |
3361 | ||
219f2f23 PA |
3362 | write_ok (packet); |
3363 | } | |
3364 | ||
3365 | /* End a tracing run, filling in a stop reason to report back to GDB, | |
3366 | and removing the tracepoints from the code. */ | |
3367 | ||
8336d594 | 3368 | void |
219f2f23 PA |
3369 | stop_tracing (void) |
3370 | { | |
3371 | if (!tracing) | |
3372 | { | |
3373 | trace_debug ("Tracing is already off, ignoring"); | |
3374 | return; | |
3375 | } | |
3376 | ||
3377 | trace_debug ("Stopping the trace"); | |
3378 | ||
fa593d66 PA |
3379 | /* Pause all threads before removing fast jumps from memory, |
3380 | breakpoints, and touching IPA state variables (inferior memory). | |
3381 | Some thread may hit the internal tracing breakpoints, or be | |
3382 | collecting this moment, but that's ok, we don't release the | |
3383 | tpoint object's memory or the jump pads here (we only do that | |
3384 | when we're sure we can move all threads out of the jump pads). | |
3385 | We can't now, since we may be getting here due to the inferior | |
3386 | agent calling us. */ | |
7984d532 PA |
3387 | pause_all (1); |
3388 | /* Since we're removing breakpoints, cancel breakpoint hits, | |
3389 | possibly related to the breakpoints we're about to delete. */ | |
3390 | cancel_breakpoints (); | |
3391 | ||
219f2f23 PA |
3392 | /* Stop logging. Tracepoints can still be hit, but they will not be |
3393 | recorded. */ | |
3394 | tracing = 0; | |
58b4daa5 | 3395 | if (agent_loaded_p ()) |
fa593d66 PA |
3396 | { |
3397 | if (write_inferior_integer (ipa_sym_addrs.addr_tracing, 0)) | |
3398 | fatal ("Error clearing tracing variable in lib"); | |
3399 | } | |
219f2f23 | 3400 | |
f196051f | 3401 | tracing_stop_time = get_timestamp (); |
219f2f23 PA |
3402 | tracing_stop_reason = "t???"; |
3403 | tracing_stop_tpnum = 0; | |
3404 | if (stopping_tracepoint) | |
3405 | { | |
3406 | trace_debug ("Stopping the trace because " | |
5f18041e | 3407 | "tracepoint %d was hit %" PRIu64 " times", |
219f2f23 PA |
3408 | stopping_tracepoint->number, |
3409 | stopping_tracepoint->pass_count); | |
3410 | tracing_stop_reason = "tpasscount"; | |
3411 | tracing_stop_tpnum = stopping_tracepoint->number; | |
3412 | } | |
3413 | else if (trace_buffer_is_full) | |
3414 | { | |
3415 | trace_debug ("Stopping the trace because the trace buffer is full"); | |
3416 | tracing_stop_reason = "tfull"; | |
3417 | } | |
3418 | else if (expr_eval_result != expr_eval_no_error) | |
3419 | { | |
3420 | trace_debug ("Stopping the trace because of an expression eval error"); | |
3421 | tracing_stop_reason = eval_result_names[expr_eval_result]; | |
3422 | tracing_stop_tpnum = error_tracepoint->number; | |
3423 | } | |
fa593d66 | 3424 | #ifndef IN_PROCESS_AGENT |
8336d594 PA |
3425 | else if (!gdb_connected ()) |
3426 | { | |
3427 | trace_debug ("Stopping the trace because GDB disconnected"); | |
3428 | tracing_stop_reason = "tdisconnected"; | |
3429 | } | |
fa593d66 | 3430 | #endif |
219f2f23 PA |
3431 | else |
3432 | { | |
3433 | trace_debug ("Stopping the trace because of a tstop command"); | |
3434 | tracing_stop_reason = "tstop"; | |
3435 | } | |
3436 | ||
3437 | stopping_tracepoint = NULL; | |
3438 | error_tracepoint = NULL; | |
3439 | ||
3440 | /* Clear out the tracepoints. */ | |
3441 | clear_installed_tracepoints (); | |
7984d532 | 3442 | |
58b4daa5 | 3443 | if (agent_loaded_p ()) |
fa593d66 PA |
3444 | { |
3445 | /* Pull in fast tracepoint trace frames from the inferior lib | |
3446 | buffer into our buffer, even if our buffer is already full, | |
3447 | because we want to present the full number of created frames | |
3448 | in addition to what fit in the trace buffer. */ | |
3449 | upload_fast_traceframes (); | |
3450 | } | |
3451 | ||
3452 | if (stop_tracing_bkpt != NULL) | |
3453 | { | |
3454 | delete_breakpoint (stop_tracing_bkpt); | |
3455 | stop_tracing_bkpt = NULL; | |
3456 | } | |
3457 | ||
3458 | if (flush_trace_buffer_bkpt != NULL) | |
3459 | { | |
3460 | delete_breakpoint (flush_trace_buffer_bkpt); | |
3461 | flush_trace_buffer_bkpt = NULL; | |
3462 | } | |
3463 | ||
7984d532 | 3464 | unpause_all (1); |
219f2f23 PA |
3465 | } |
3466 | ||
fa593d66 PA |
3467 | static int |
3468 | stop_tracing_handler (CORE_ADDR addr) | |
3469 | { | |
3470 | trace_debug ("lib hit stop_tracing"); | |
3471 | ||
3472 | /* Don't actually handle it here. When we stop tracing we remove | |
3473 | breakpoints from the inferior, and that is not allowed in a | |
3474 | breakpoint handler (as the caller is walking the breakpoint | |
3475 | list). */ | |
3476 | return 0; | |
3477 | } | |
3478 | ||
3479 | static int | |
3480 | flush_trace_buffer_handler (CORE_ADDR addr) | |
3481 | { | |
3482 | trace_debug ("lib hit flush_trace_buffer"); | |
3483 | return 0; | |
3484 | } | |
3485 | ||
219f2f23 PA |
3486 | static void |
3487 | cmd_qtstop (char *packet) | |
3488 | { | |
3489 | stop_tracing (); | |
3490 | write_ok (packet); | |
3491 | } | |
3492 | ||
8336d594 PA |
3493 | static void |
3494 | cmd_qtdisconnected (char *own_buf) | |
3495 | { | |
3496 | ULONGEST setting; | |
3497 | char *packet = own_buf; | |
3498 | ||
3499 | packet += strlen ("QTDisconnected:"); | |
3500 | ||
3501 | unpack_varlen_hex (packet, &setting); | |
3502 | ||
3503 | write_ok (own_buf); | |
3504 | ||
3505 | disconnected_tracing = setting; | |
3506 | } | |
3507 | ||
219f2f23 PA |
3508 | static void |
3509 | cmd_qtframe (char *own_buf) | |
3510 | { | |
3511 | ULONGEST frame, pc, lo, hi, num; | |
3512 | int tfnum, tpnum; | |
3513 | struct traceframe *tframe; | |
3514 | char *packet = own_buf; | |
3515 | ||
3516 | packet += strlen ("QTFrame:"); | |
3517 | ||
3518 | if (strncmp (packet, "pc:", strlen ("pc:")) == 0) | |
3519 | { | |
3520 | packet += strlen ("pc:"); | |
f8f67713 | 3521 | unpack_varlen_hex (packet, &pc); |
219f2f23 PA |
3522 | trace_debug ("Want to find next traceframe at pc=0x%s", paddress (pc)); |
3523 | tframe = find_next_traceframe_in_range (pc, pc, 1, &tfnum); | |
3524 | } | |
3525 | else if (strncmp (packet, "range:", strlen ("range:")) == 0) | |
3526 | { | |
3527 | packet += strlen ("range:"); | |
3528 | packet = unpack_varlen_hex (packet, &lo); | |
3529 | ++packet; | |
f8f67713 | 3530 | unpack_varlen_hex (packet, &hi); |
219f2f23 PA |
3531 | trace_debug ("Want to find next traceframe in the range 0x%s to 0x%s", |
3532 | paddress (lo), paddress (hi)); | |
3533 | tframe = find_next_traceframe_in_range (lo, hi, 1, &tfnum); | |
3534 | } | |
3535 | else if (strncmp (packet, "outside:", strlen ("outside:")) == 0) | |
3536 | { | |
3537 | packet += strlen ("outside:"); | |
3538 | packet = unpack_varlen_hex (packet, &lo); | |
3539 | ++packet; | |
f8f67713 | 3540 | unpack_varlen_hex (packet, &hi); |
219f2f23 PA |
3541 | trace_debug ("Want to find next traceframe " |
3542 | "outside the range 0x%s to 0x%s", | |
3543 | paddress (lo), paddress (hi)); | |
3544 | tframe = find_next_traceframe_in_range (lo, hi, 0, &tfnum); | |
3545 | } | |
3546 | else if (strncmp (packet, "tdp:", strlen ("tdp:")) == 0) | |
3547 | { | |
3548 | packet += strlen ("tdp:"); | |
f8f67713 | 3549 | unpack_varlen_hex (packet, &num); |
219f2f23 PA |
3550 | tpnum = (int) num; |
3551 | trace_debug ("Want to find next traceframe for tracepoint %d", tpnum); | |
3552 | tframe = find_next_traceframe_by_tracepoint (tpnum, &tfnum); | |
3553 | } | |
3554 | else | |
3555 | { | |
3556 | unpack_varlen_hex (packet, &frame); | |
3557 | tfnum = (int) frame; | |
3558 | if (tfnum == -1) | |
3559 | { | |
3560 | trace_debug ("Want to stop looking at traceframes"); | |
3561 | current_traceframe = -1; | |
3562 | write_ok (own_buf); | |
3563 | return; | |
3564 | } | |
3565 | trace_debug ("Want to look at traceframe %d", tfnum); | |
3566 | tframe = find_traceframe (tfnum); | |
3567 | } | |
3568 | ||
3569 | if (tframe) | |
3570 | { | |
3571 | current_traceframe = tfnum; | |
3572 | sprintf (own_buf, "F%xT%x", tfnum, tframe->tpnum); | |
3573 | } | |
3574 | else | |
3575 | sprintf (own_buf, "F-1"); | |
3576 | } | |
3577 | ||
3578 | static void | |
3579 | cmd_qtstatus (char *packet) | |
3580 | { | |
3581 | char *stop_reason_rsp = NULL; | |
f196051f SS |
3582 | char *buf1, *buf2, *buf3, *str; |
3583 | int slen; | |
3584 | ||
3585 | /* Translate the plain text of the notes back into hex for | |
3586 | transmission. */ | |
3587 | ||
3588 | str = (tracing_user_name ? tracing_user_name : ""); | |
3589 | slen = strlen (str); | |
3590 | buf1 = (char *) alloca (slen * 2 + 1); | |
3591 | hexify (buf1, str, slen); | |
3592 | ||
3593 | str = (tracing_notes ? tracing_notes : ""); | |
3594 | slen = strlen (str); | |
3595 | buf2 = (char *) alloca (slen * 2 + 1); | |
3596 | hexify (buf2, str, slen); | |
3597 | ||
3598 | str = (tracing_stop_note ? tracing_stop_note : ""); | |
3599 | slen = strlen (str); | |
3600 | buf3 = (char *) alloca (slen * 2 + 1); | |
3601 | hexify (buf3, str, slen); | |
219f2f23 PA |
3602 | |
3603 | trace_debug ("Returning trace status as %d, stop reason %s", | |
3604 | tracing, tracing_stop_reason); | |
3605 | ||
58b4daa5 | 3606 | if (agent_loaded_p ()) |
fa593d66 PA |
3607 | { |
3608 | pause_all (1); | |
3609 | ||
3610 | upload_fast_traceframes (); | |
3611 | ||
3612 | unpause_all (1); | |
3613 | } | |
3614 | ||
219f2f23 PA |
3615 | stop_reason_rsp = (char *) tracing_stop_reason; |
3616 | ||
3617 | /* The user visible error string in terror needs to be hex encoded. | |
f196051f | 3618 | We leave it as plain string in `tracing_stop_reason' to ease |
219f2f23 PA |
3619 | debugging. */ |
3620 | if (strncmp (stop_reason_rsp, "terror:", strlen ("terror:")) == 0) | |
3621 | { | |
3622 | const char *result_name; | |
3623 | int hexstr_len; | |
3624 | char *p; | |
3625 | ||
3626 | result_name = stop_reason_rsp + strlen ("terror:"); | |
3627 | hexstr_len = strlen (result_name) * 2; | |
3628 | p = stop_reason_rsp = alloca (strlen ("terror:") + hexstr_len + 1); | |
3629 | strcpy (p, "terror:"); | |
3630 | p += strlen (p); | |
3631 | convert_int_to_ascii ((gdb_byte *) result_name, p, strlen (result_name)); | |
3632 | } | |
3633 | ||
f196051f SS |
3634 | /* If this was a forced stop, include any stop note that was supplied. */ |
3635 | if (strcmp (stop_reason_rsp, "tstop") == 0) | |
3636 | { | |
3637 | stop_reason_rsp = alloca (strlen ("tstop:") + strlen (buf3) + 1); | |
3638 | strcpy (stop_reason_rsp, "tstop:"); | |
3639 | strcat (stop_reason_rsp, buf3); | |
3640 | } | |
3641 | ||
8336d594 PA |
3642 | sprintf (packet, |
3643 | "T%d;" | |
3644 | "%s:%x;" | |
3645 | "tframes:%x;tcreated:%x;" | |
3646 | "tfree:%x;tsize:%s;" | |
3647 | "circular:%d;" | |
f196051f | 3648 | "disconn:%d;" |
242f5f1c | 3649 | "starttime:%s;stoptime:%s;" |
f196051f | 3650 | "username:%s:;notes:%s:", |
623ccd72 | 3651 | tracing ? 1 : 0, |
219f2f23 PA |
3652 | stop_reason_rsp, tracing_stop_tpnum, |
3653 | traceframe_count, traceframes_created, | |
8336d594 PA |
3654 | free_space (), phex_nz (trace_buffer_hi - trace_buffer_lo, 0), |
3655 | circular_trace_buffer, | |
f196051f | 3656 | disconnected_tracing, |
242f5f1c | 3657 | plongest (tracing_start_time), plongest (tracing_stop_time), |
f196051f SS |
3658 | buf1, buf2); |
3659 | } | |
3660 | ||
3661 | static void | |
3662 | cmd_qtp (char *own_buf) | |
3663 | { | |
3664 | ULONGEST num, addr; | |
3665 | struct tracepoint *tpoint; | |
3666 | char *packet = own_buf; | |
3667 | ||
3668 | packet += strlen ("qTP:"); | |
3669 | ||
3670 | packet = unpack_varlen_hex (packet, &num); | |
3671 | ++packet; /* skip a colon */ | |
3672 | packet = unpack_varlen_hex (packet, &addr); | |
3673 | ||
3674 | /* See if we already have this tracepoint. */ | |
3675 | tpoint = find_tracepoint (num, addr); | |
3676 | ||
3677 | if (!tpoint) | |
3678 | { | |
3679 | trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found", | |
3680 | (int) num, paddress (addr)); | |
3681 | write_enn (own_buf); | |
3682 | return; | |
3683 | } | |
3684 | ||
5f18041e YQ |
3685 | sprintf (own_buf, "V%" PRIu64 ":%" PRIu64 "", tpoint->hit_count, |
3686 | tpoint->traceframe_usage); | |
219f2f23 PA |
3687 | } |
3688 | ||
3689 | /* State variables to help return all the tracepoint bits. */ | |
3690 | static struct tracepoint *cur_tpoint; | |
3691 | static int cur_action; | |
3692 | static int cur_step_action; | |
3693 | static struct source_string *cur_source_string; | |
3694 | static struct trace_state_variable *cur_tsv; | |
3695 | ||
3696 | /* Compose a response that is an imitation of the syntax by which the | |
3697 | tracepoint was originally downloaded. */ | |
3698 | ||
3699 | static void | |
3700 | response_tracepoint (char *packet, struct tracepoint *tpoint) | |
3701 | { | |
3702 | char *buf; | |
3703 | ||
5f18041e | 3704 | sprintf (packet, "T%x:%s:%c:%" PRIx64 ":%" PRIx64, tpoint->number, |
219f2f23 PA |
3705 | paddress (tpoint->address), |
3706 | (tpoint->enabled ? 'E' : 'D'), tpoint->step_count, | |
3707 | tpoint->pass_count); | |
fa593d66 PA |
3708 | if (tpoint->type == fast_tracepoint) |
3709 | sprintf (packet + strlen (packet), ":F%x", tpoint->orig_size); | |
0fb4aa4b PA |
3710 | else if (tpoint->type == static_tracepoint) |
3711 | sprintf (packet + strlen (packet), ":S"); | |
219f2f23 PA |
3712 | |
3713 | if (tpoint->cond) | |
3714 | { | |
5e1dc496 | 3715 | buf = gdb_unparse_agent_expr (tpoint->cond); |
219f2f23 PA |
3716 | sprintf (packet + strlen (packet), ":X%x,%s", |
3717 | tpoint->cond->length, buf); | |
3718 | free (buf); | |
3719 | } | |
3720 | } | |
3721 | ||
3722 | /* Compose a response that is an imitation of the syntax by which the | |
3723 | tracepoint action was originally downloaded (with the difference | |
3724 | that due to the way we store the actions, this will output a packet | |
3725 | per action, while GDB could have combined more than one action | |
3726 | per-packet. */ | |
3727 | ||
3728 | static void | |
3729 | response_action (char *packet, struct tracepoint *tpoint, | |
3730 | char *taction, int step) | |
3731 | { | |
3732 | sprintf (packet, "%c%x:%s:%s", | |
3733 | (step ? 'S' : 'A'), tpoint->number, paddress (tpoint->address), | |
3734 | taction); | |
3735 | } | |
3736 | ||
3737 | /* Compose a response that is an imitation of the syntax by which the | |
3738 | tracepoint source piece was originally downloaded. */ | |
3739 | ||
3740 | static void | |
3741 | response_source (char *packet, | |
3742 | struct tracepoint *tpoint, struct source_string *src) | |
3743 | { | |
3744 | char *buf; | |
3745 | int len; | |
3746 | ||
3747 | len = strlen (src->str); | |
3748 | buf = alloca (len * 2 + 1); | |
3749 | convert_int_to_ascii ((gdb_byte *) src->str, buf, len); | |
3750 | ||
3751 | sprintf (packet, "Z%x:%s:%s:%x:%x:%s", | |
3752 | tpoint->number, paddress (tpoint->address), | |
3753 | src->type, 0, len, buf); | |
3754 | } | |
3755 | ||
3756 | /* Return the first piece of tracepoint definition, and initialize the | |
3757 | state machine that will iterate through all the tracepoint | |
3758 | bits. */ | |
3759 | ||
3760 | static void | |
3761 | cmd_qtfp (char *packet) | |
3762 | { | |
3763 | trace_debug ("Returning first tracepoint definition piece"); | |
3764 | ||
3765 | cur_tpoint = tracepoints; | |
3766 | cur_action = cur_step_action = -1; | |
3767 | cur_source_string = NULL; | |
3768 | ||
3769 | if (cur_tpoint) | |
3770 | response_tracepoint (packet, cur_tpoint); | |
3771 | else | |
3772 | strcpy (packet, "l"); | |
3773 | } | |
3774 | ||
3775 | /* Return additional pieces of tracepoint definition. Each action and | |
3776 | stepping action must go into its own packet, because of packet size | |
3777 | limits, and so we use state variables to deliver one piece at a | |
3778 | time. */ | |
3779 | ||
3780 | static void | |
3781 | cmd_qtsp (char *packet) | |
3782 | { | |
3783 | trace_debug ("Returning subsequent tracepoint definition piece"); | |
3784 | ||
3785 | if (!cur_tpoint) | |
3786 | { | |
3787 | /* This case would normally never occur, but be prepared for | |
3788 | GDB misbehavior. */ | |
3789 | strcpy (packet, "l"); | |
3790 | } | |
3791 | else if (cur_action < cur_tpoint->numactions - 1) | |
3792 | { | |
3793 | ++cur_action; | |
3794 | response_action (packet, cur_tpoint, | |
3795 | cur_tpoint->actions_str[cur_action], 0); | |
3796 | } | |
3797 | else if (cur_step_action < cur_tpoint->num_step_actions - 1) | |
3798 | { | |
3799 | ++cur_step_action; | |
3800 | response_action (packet, cur_tpoint, | |
3801 | cur_tpoint->step_actions_str[cur_step_action], 1); | |
3802 | } | |
3803 | else if ((cur_source_string | |
3804 | ? cur_source_string->next | |
3805 | : cur_tpoint->source_strings)) | |
3806 | { | |
3807 | if (cur_source_string) | |
3808 | cur_source_string = cur_source_string->next; | |
3809 | else | |
3810 | cur_source_string = cur_tpoint->source_strings; | |
3811 | response_source (packet, cur_tpoint, cur_source_string); | |
3812 | } | |
3813 | else | |
3814 | { | |
3815 | cur_tpoint = cur_tpoint->next; | |
3816 | cur_action = cur_step_action = -1; | |
3817 | cur_source_string = NULL; | |
3818 | if (cur_tpoint) | |
3819 | response_tracepoint (packet, cur_tpoint); | |
3820 | else | |
3821 | strcpy (packet, "l"); | |
3822 | } | |
3823 | } | |
3824 | ||
3825 | /* Compose a response that is an imitation of the syntax by which the | |
3826 | trace state variable was originally downloaded. */ | |
3827 | ||
3828 | static void | |
3829 | response_tsv (char *packet, struct trace_state_variable *tsv) | |
3830 | { | |
3831 | char *buf = (char *) ""; | |
3832 | int namelen; | |
3833 | ||
3834 | if (tsv->name) | |
3835 | { | |
3836 | namelen = strlen (tsv->name); | |
3837 | buf = alloca (namelen * 2 + 1); | |
3838 | convert_int_to_ascii ((gdb_byte *) tsv->name, buf, namelen); | |
3839 | } | |
3840 | ||
3841 | sprintf (packet, "%x:%s:%x:%s", tsv->number, phex_nz (tsv->initial_value, 0), | |
3842 | tsv->getter ? 1 : 0, buf); | |
3843 | } | |
3844 | ||
3845 | /* Return the first trace state variable definition, and initialize | |
3846 | the state machine that will iterate through all the tsv bits. */ | |
3847 | ||
3848 | static void | |
3849 | cmd_qtfv (char *packet) | |
3850 | { | |
3851 | trace_debug ("Returning first trace state variable definition"); | |
3852 | ||
3853 | cur_tsv = trace_state_variables; | |
3854 | ||
3855 | if (cur_tsv) | |
3856 | response_tsv (packet, cur_tsv); | |
3857 | else | |
3858 | strcpy (packet, "l"); | |
3859 | } | |
3860 | ||
3861 | /* Return additional trace state variable definitions. */ | |
3862 | ||
3863 | static void | |
3864 | cmd_qtsv (char *packet) | |
3865 | { | |
3866 | trace_debug ("Returning first trace state variable definition"); | |
3867 | ||
3868 | if (!cur_tpoint) | |
3869 | { | |
3870 | /* This case would normally never occur, but be prepared for | |
3871 | GDB misbehavior. */ | |
3872 | strcpy (packet, "l"); | |
3873 | } | |
3874 | else if (cur_tsv) | |
3875 | { | |
3876 | cur_tsv = cur_tsv->next; | |
3877 | if (cur_tsv) | |
3878 | response_tsv (packet, cur_tsv); | |
3879 | else | |
3880 | strcpy (packet, "l"); | |
3881 | } | |
3882 | else | |
3883 | strcpy (packet, "l"); | |
3884 | } | |
3885 | ||
0fb4aa4b PA |
3886 | /* Return the first static tracepoint marker, and initialize the state |
3887 | machine that will iterate through all the static tracepoints | |
3888 | markers. */ | |
3889 | ||
3890 | static void | |
3891 | cmd_qtfstm (char *packet) | |
3892 | { | |
3893 | if (!maybe_write_ipa_ust_not_loaded (packet)) | |
42476b70 | 3894 | run_inferior_command (packet, strlen (packet) + 1); |
0fb4aa4b PA |
3895 | } |
3896 | ||
3897 | /* Return additional static tracepoints markers. */ | |
3898 | ||
3899 | static void | |
3900 | cmd_qtsstm (char *packet) | |
3901 | { | |
3902 | if (!maybe_write_ipa_ust_not_loaded (packet)) | |
42476b70 | 3903 | run_inferior_command (packet, strlen (packet) + 1); |
0fb4aa4b PA |
3904 | } |
3905 | ||
3906 | /* Return the definition of the static tracepoint at a given address. | |
3907 | Result packet is the same as qTsST's. */ | |
3908 | ||
3909 | static void | |
3910 | cmd_qtstmat (char *packet) | |
3911 | { | |
3912 | if (!maybe_write_ipa_ust_not_loaded (packet)) | |
42476b70 | 3913 | run_inferior_command (packet, strlen (packet) + 1); |
0fb4aa4b PA |
3914 | } |
3915 | ||
405f8e94 SS |
3916 | /* Return the minimum instruction size needed for fast tracepoints as a |
3917 | hexadecimal number. */ | |
3918 | ||
3919 | static void | |
3920 | cmd_qtminftpilen (char *packet) | |
3921 | { | |
e886a173 PA |
3922 | if (current_inferior == NULL) |
3923 | { | |
3924 | /* Indicate that the minimum length is currently unknown. */ | |
3925 | strcpy (packet, "0"); | |
3926 | return; | |
3927 | } | |
3928 | ||
405f8e94 SS |
3929 | sprintf (packet, "%x", target_get_min_fast_tracepoint_insn_len ()); |
3930 | } | |
3931 | ||
219f2f23 PA |
3932 | /* Respond to qTBuffer packet with a block of raw data from the trace |
3933 | buffer. GDB may ask for a lot, but we are allowed to reply with | |
3934 | only as much as will fit within packet limits or whatever. */ | |
3935 | ||
3936 | static void | |
3937 | cmd_qtbuffer (char *own_buf) | |
3938 | { | |
3939 | ULONGEST offset, num, tot; | |
3940 | unsigned char *tbp; | |
3941 | char *packet = own_buf; | |
3942 | ||
3943 | packet += strlen ("qTBuffer:"); | |
3944 | ||
3945 | packet = unpack_varlen_hex (packet, &offset); | |
3946 | ++packet; /* skip a comma */ | |
f8f67713 | 3947 | unpack_varlen_hex (packet, &num); |
219f2f23 PA |
3948 | |
3949 | trace_debug ("Want to get trace buffer, %d bytes at offset 0x%s", | |
3950 | (int) num, pulongest (offset)); | |
3951 | ||
3952 | tot = (trace_buffer_hi - trace_buffer_lo) - free_space (); | |
3953 | ||
3954 | /* If we're right at the end, reply specially that we're done. */ | |
3955 | if (offset == tot) | |
3956 | { | |
3957 | strcpy (own_buf, "l"); | |
3958 | return; | |
3959 | } | |
3960 | ||
3961 | /* Object to any other out-of-bounds request. */ | |
3962 | if (offset > tot) | |
3963 | { | |
3964 | write_enn (own_buf); | |
3965 | return; | |
3966 | } | |
3967 | ||
3968 | /* Compute the pointer corresponding to the given offset, accounting | |
3969 | for wraparound. */ | |
3970 | tbp = trace_buffer_start + offset; | |
3971 | if (tbp >= trace_buffer_wrap) | |
3972 | tbp -= (trace_buffer_wrap - trace_buffer_lo); | |
3973 | ||
3974 | /* Trim to the remaining bytes if we're close to the end. */ | |
3975 | if (num > tot - offset) | |
3976 | num = tot - offset; | |
3977 | ||
3978 | /* Trim to available packet size. */ | |
3979 | if (num >= (PBUFSIZ - 16) / 2 ) | |
3980 | num = (PBUFSIZ - 16) / 2; | |
3981 | ||
3982 | convert_int_to_ascii (tbp, own_buf, num); | |
3983 | own_buf[num] = '\0'; | |
3984 | } | |
3985 | ||
3986 | static void | |
277e4e52 | 3987 | cmd_bigqtbuffer_circular (char *own_buf) |
219f2f23 PA |
3988 | { |
3989 | ULONGEST val; | |
3990 | char *packet = own_buf; | |
3991 | ||
277e4e52 | 3992 | packet += strlen ("QTBuffer:circular:"); |
219f2f23 | 3993 | |
277e4e52 PA |
3994 | unpack_varlen_hex (packet, &val); |
3995 | circular_trace_buffer = val; | |
3996 | trace_debug ("Trace buffer is now %s", | |
3997 | circular_trace_buffer ? "circular" : "linear"); | |
3998 | write_ok (own_buf); | |
219f2f23 PA |
3999 | } |
4000 | ||
f196051f SS |
4001 | static void |
4002 | cmd_qtnotes (char *own_buf) | |
4003 | { | |
4004 | size_t nbytes; | |
4005 | char *saved, *user, *notes, *stopnote; | |
4006 | char *packet = own_buf; | |
4007 | ||
4008 | packet += strlen ("QTNotes:"); | |
4009 | ||
4010 | while (*packet) | |
4011 | { | |
4012 | if (strncmp ("user:", packet, strlen ("user:")) == 0) | |
4013 | { | |
4014 | packet += strlen ("user:"); | |
4015 | saved = packet; | |
4016 | packet = strchr (packet, ';'); | |
4017 | nbytes = (packet - saved) / 2; | |
4018 | user = xmalloc (nbytes + 1); | |
4019 | nbytes = unhexify (user, saved, nbytes); | |
4020 | user[nbytes] = '\0'; | |
4021 | ++packet; /* skip the semicolon */ | |
4022 | trace_debug ("User is '%s'", user); | |
4023 | tracing_user_name = user; | |
4024 | } | |
4025 | else if (strncmp ("notes:", packet, strlen ("notes:")) == 0) | |
4026 | { | |
4027 | packet += strlen ("notes:"); | |
4028 | saved = packet; | |
4029 | packet = strchr (packet, ';'); | |
4030 | nbytes = (packet - saved) / 2; | |
4031 | notes = xmalloc (nbytes + 1); | |
4032 | nbytes = unhexify (notes, saved, nbytes); | |
4033 | notes[nbytes] = '\0'; | |
4034 | ++packet; /* skip the semicolon */ | |
4035 | trace_debug ("Notes is '%s'", notes); | |
4036 | tracing_notes = notes; | |
4037 | } | |
4038 | else if (strncmp ("tstop:", packet, strlen ("tstop:")) == 0) | |
4039 | { | |
4040 | packet += strlen ("tstop:"); | |
4041 | saved = packet; | |
4042 | packet = strchr (packet, ';'); | |
4043 | nbytes = (packet - saved) / 2; | |
4044 | stopnote = xmalloc (nbytes + 1); | |
4045 | nbytes = unhexify (stopnote, saved, nbytes); | |
4046 | stopnote[nbytes] = '\0'; | |
4047 | ++packet; /* skip the semicolon */ | |
4048 | trace_debug ("tstop note is '%s'", stopnote); | |
4049 | tracing_stop_note = stopnote; | |
4050 | } | |
4051 | else | |
4052 | break; | |
4053 | } | |
4054 | ||
4055 | write_ok (own_buf); | |
4056 | } | |
4057 | ||
219f2f23 PA |
4058 | int |
4059 | handle_tracepoint_general_set (char *packet) | |
4060 | { | |
4061 | if (strcmp ("QTinit", packet) == 0) | |
4062 | { | |
4063 | cmd_qtinit (packet); | |
4064 | return 1; | |
4065 | } | |
4066 | else if (strncmp ("QTDP:", packet, strlen ("QTDP:")) == 0) | |
4067 | { | |
4068 | cmd_qtdp (packet); | |
4069 | return 1; | |
4070 | } | |
4071 | else if (strncmp ("QTDPsrc:", packet, strlen ("QTDPsrc:")) == 0) | |
4072 | { | |
4073 | cmd_qtdpsrc (packet); | |
4074 | return 1; | |
4075 | } | |
d248b706 KY |
4076 | else if (strncmp ("QTEnable:", packet, strlen ("QTEnable:")) == 0) |
4077 | { | |
4078 | cmd_qtenable_disable (packet, 1); | |
4079 | return 1; | |
4080 | } | |
4081 | else if (strncmp ("QTDisable:", packet, strlen ("QTDisable:")) == 0) | |
4082 | { | |
4083 | cmd_qtenable_disable (packet, 0); | |
4084 | return 1; | |
4085 | } | |
219f2f23 PA |
4086 | else if (strncmp ("QTDV:", packet, strlen ("QTDV:")) == 0) |
4087 | { | |
4088 | cmd_qtdv (packet); | |
4089 | return 1; | |
4090 | } | |
4091 | else if (strncmp ("QTro:", packet, strlen ("QTro:")) == 0) | |
4092 | { | |
4093 | cmd_qtro (packet); | |
4094 | return 1; | |
4095 | } | |
4096 | else if (strcmp ("QTStart", packet) == 0) | |
4097 | { | |
4098 | cmd_qtstart (packet); | |
4099 | return 1; | |
4100 | } | |
4101 | else if (strcmp ("QTStop", packet) == 0) | |
4102 | { | |
4103 | cmd_qtstop (packet); | |
4104 | return 1; | |
4105 | } | |
8336d594 PA |
4106 | else if (strncmp ("QTDisconnected:", packet, |
4107 | strlen ("QTDisconnected:")) == 0) | |
4108 | { | |
4109 | cmd_qtdisconnected (packet); | |
4110 | return 1; | |
4111 | } | |
219f2f23 PA |
4112 | else if (strncmp ("QTFrame:", packet, strlen ("QTFrame:")) == 0) |
4113 | { | |
4114 | cmd_qtframe (packet); | |
4115 | return 1; | |
4116 | } | |
277e4e52 | 4117 | else if (strncmp ("QTBuffer:circular:", packet, strlen ("QTBuffer:circular:")) == 0) |
219f2f23 | 4118 | { |
277e4e52 | 4119 | cmd_bigqtbuffer_circular (packet); |
219f2f23 PA |
4120 | return 1; |
4121 | } | |
f196051f SS |
4122 | else if (strncmp ("QTNotes:", packet, strlen ("QTNotes:")) == 0) |
4123 | { | |
4124 | cmd_qtnotes (packet); | |
4125 | return 1; | |
4126 | } | |
219f2f23 PA |
4127 | |
4128 | return 0; | |
4129 | } | |
4130 | ||
4131 | int | |
4132 | handle_tracepoint_query (char *packet) | |
4133 | { | |
4134 | if (strcmp ("qTStatus", packet) == 0) | |
4135 | { | |
4136 | cmd_qtstatus (packet); | |
4137 | return 1; | |
4138 | } | |
f196051f SS |
4139 | else if (strncmp ("qTP:", packet, strlen ("qTP:")) == 0) |
4140 | { | |
4141 | cmd_qtp (packet); | |
4142 | return 1; | |
4143 | } | |
219f2f23 PA |
4144 | else if (strcmp ("qTfP", packet) == 0) |
4145 | { | |
4146 | cmd_qtfp (packet); | |
4147 | return 1; | |
4148 | } | |
4149 | else if (strcmp ("qTsP", packet) == 0) | |
4150 | { | |
4151 | cmd_qtsp (packet); | |
4152 | return 1; | |
4153 | } | |
4154 | else if (strcmp ("qTfV", packet) == 0) | |
4155 | { | |
4156 | cmd_qtfv (packet); | |
4157 | return 1; | |
4158 | } | |
4159 | else if (strcmp ("qTsV", packet) == 0) | |
4160 | { | |
4161 | cmd_qtsv (packet); | |
4162 | return 1; | |
4163 | } | |
4164 | else if (strncmp ("qTV:", packet, strlen ("qTV:")) == 0) | |
4165 | { | |
4166 | cmd_qtv (packet); | |
4167 | return 1; | |
4168 | } | |
4169 | else if (strncmp ("qTBuffer:", packet, strlen ("qTBuffer:")) == 0) | |
4170 | { | |
4171 | cmd_qtbuffer (packet); | |
4172 | return 1; | |
4173 | } | |
0fb4aa4b PA |
4174 | else if (strcmp ("qTfSTM", packet) == 0) |
4175 | { | |
4176 | cmd_qtfstm (packet); | |
4177 | return 1; | |
4178 | } | |
4179 | else if (strcmp ("qTsSTM", packet) == 0) | |
4180 | { | |
4181 | cmd_qtsstm (packet); | |
4182 | return 1; | |
4183 | } | |
4184 | else if (strncmp ("qTSTMat:", packet, strlen ("qTSTMat:")) == 0) | |
4185 | { | |
4186 | cmd_qtstmat (packet); | |
4187 | return 1; | |
4188 | } | |
405f8e94 SS |
4189 | else if (strcmp ("qTMinFTPILen", packet) == 0) |
4190 | { | |
4191 | cmd_qtminftpilen (packet); | |
4192 | return 1; | |
4193 | } | |
219f2f23 PA |
4194 | |
4195 | return 0; | |
4196 | } | |
4197 | ||
fa593d66 PA |
4198 | #endif |
4199 | #ifndef IN_PROCESS_AGENT | |
4200 | ||
219f2f23 PA |
4201 | /* Call this when thread TINFO has hit the tracepoint defined by |
4202 | TP_NUMBER and TP_ADDRESS, and that tracepoint has a while-stepping | |
4203 | action. This adds a while-stepping collecting state item to the | |
4204 | threads' collecting state list, so that we can keep track of | |
4205 | multiple simultaneous while-stepping actions being collected by the | |
4206 | same thread. This can happen in cases like: | |
4207 | ||
4208 | ff0001 INSN1 <-- TP1, while-stepping 10 collect $regs | |
4209 | ff0002 INSN2 | |
4210 | ff0003 INSN3 <-- TP2, collect $regs | |
4211 | ff0004 INSN4 <-- TP3, while-stepping 10 collect $regs | |
4212 | ff0005 INSN5 | |
4213 | ||
4214 | Notice that when instruction INSN5 is reached, the while-stepping | |
4215 | actions of both TP1 and TP3 are still being collected, and that TP2 | |
4216 | had been collected meanwhile. The whole range of ff0001-ff0005 | |
4217 | should be single-stepped, due to at least TP1's while-stepping | |
4218 | action covering the whole range. */ | |
4219 | ||
4220 | static void | |
4221 | add_while_stepping_state (struct thread_info *tinfo, | |
4222 | int tp_number, CORE_ADDR tp_address) | |
4223 | { | |
4224 | struct wstep_state *wstep; | |
4225 | ||
4226 | wstep = xmalloc (sizeof (*wstep)); | |
4227 | wstep->next = tinfo->while_stepping; | |
4228 | ||
4229 | wstep->tp_number = tp_number; | |
4230 | wstep->tp_address = tp_address; | |
4231 | wstep->current_step = 0; | |
4232 | ||
4233 | tinfo->while_stepping = wstep; | |
4234 | } | |
4235 | ||
4236 | /* Release the while-stepping collecting state WSTEP. */ | |
4237 | ||
4238 | static void | |
4239 | release_while_stepping_state (struct wstep_state *wstep) | |
4240 | { | |
4241 | free (wstep); | |
4242 | } | |
4243 | ||
4244 | /* Release all while-stepping collecting states currently associated | |
4245 | with thread TINFO. */ | |
4246 | ||
4247 | void | |
4248 | release_while_stepping_state_list (struct thread_info *tinfo) | |
4249 | { | |
4250 | struct wstep_state *head; | |
4251 | ||
4252 | while (tinfo->while_stepping) | |
4253 | { | |
4254 | head = tinfo->while_stepping; | |
4255 | tinfo->while_stepping = head->next; | |
4256 | release_while_stepping_state (head); | |
4257 | } | |
4258 | } | |
4259 | ||
4260 | /* If TINFO was handling a 'while-stepping' action, the step has | |
4261 | finished, so collect any step data needed, and check if any more | |
4262 | steps are required. Return true if the thread was indeed | |
4263 | collecting tracepoint data, false otherwise. */ | |
4264 | ||
4265 | int | |
4266 | tracepoint_finished_step (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
4267 | { | |
4268 | struct tracepoint *tpoint; | |
4269 | struct wstep_state *wstep; | |
4270 | struct wstep_state **wstep_link; | |
4271 | struct trap_tracepoint_ctx ctx; | |
4272 | ||
fa593d66 PA |
4273 | /* Pull in fast tracepoint trace frames from the inferior lib buffer into |
4274 | our buffer. */ | |
58b4daa5 | 4275 | if (agent_loaded_p ()) |
fa593d66 PA |
4276 | upload_fast_traceframes (); |
4277 | ||
219f2f23 PA |
4278 | /* Check if we were indeed collecting data for one of more |
4279 | tracepoints with a 'while-stepping' count. */ | |
4280 | if (tinfo->while_stepping == NULL) | |
4281 | return 0; | |
4282 | ||
4283 | if (!tracing) | |
4284 | { | |
4285 | /* We're not even tracing anymore. Stop this thread from | |
4286 | collecting. */ | |
4287 | release_while_stepping_state_list (tinfo); | |
4288 | ||
4289 | /* The thread had stopped due to a single-step request indeed | |
4290 | explained by a tracepoint. */ | |
4291 | return 1; | |
4292 | } | |
4293 | ||
4294 | wstep = tinfo->while_stepping; | |
4295 | wstep_link = &tinfo->while_stepping; | |
4296 | ||
4297 | trace_debug ("Thread %s finished a single-step for tracepoint %d at 0x%s", | |
4298 | target_pid_to_str (tinfo->entry.id), | |
4299 | wstep->tp_number, paddress (wstep->tp_address)); | |
4300 | ||
fa593d66 | 4301 | ctx.base.type = trap_tracepoint; |
219f2f23 PA |
4302 | ctx.regcache = get_thread_regcache (tinfo, 1); |
4303 | ||
4304 | while (wstep != NULL) | |
4305 | { | |
4306 | tpoint = find_tracepoint (wstep->tp_number, wstep->tp_address); | |
4307 | if (tpoint == NULL) | |
4308 | { | |
4309 | trace_debug ("NO TRACEPOINT %d at 0x%s FOR THREAD %s!", | |
4310 | wstep->tp_number, paddress (wstep->tp_address), | |
4311 | target_pid_to_str (tinfo->entry.id)); | |
4312 | ||
4313 | /* Unlink. */ | |
4314 | *wstep_link = wstep->next; | |
4315 | release_while_stepping_state (wstep); | |
4f269b12 | 4316 | wstep = *wstep_link; |
219f2f23 PA |
4317 | continue; |
4318 | } | |
4319 | ||
4320 | /* We've just finished one step. */ | |
4321 | ++wstep->current_step; | |
4322 | ||
4323 | /* Collect data. */ | |
4324 | collect_data_at_step ((struct tracepoint_hit_ctx *) &ctx, | |
4325 | stop_pc, tpoint, wstep->current_step); | |
4326 | ||
4327 | if (wstep->current_step >= tpoint->step_count) | |
4328 | { | |
4329 | /* The requested numbers of steps have occurred. */ | |
4330 | trace_debug ("Thread %s done stepping for tracepoint %d at 0x%s", | |
4331 | target_pid_to_str (tinfo->entry.id), | |
4332 | wstep->tp_number, paddress (wstep->tp_address)); | |
4333 | ||
4334 | /* Unlink the wstep. */ | |
4335 | *wstep_link = wstep->next; | |
4336 | release_while_stepping_state (wstep); | |
4337 | wstep = *wstep_link; | |
4338 | ||
4339 | /* Only check the hit count now, which ensure that we do all | |
4340 | our stepping before stopping the run. */ | |
4341 | if (tpoint->pass_count > 0 | |
4342 | && tpoint->hit_count >= tpoint->pass_count | |
4343 | && stopping_tracepoint == NULL) | |
4344 | stopping_tracepoint = tpoint; | |
4345 | } | |
4346 | else | |
4347 | { | |
4348 | /* Keep single-stepping until the requested numbers of steps | |
4349 | have occurred. */ | |
4350 | wstep_link = &wstep->next; | |
4351 | wstep = *wstep_link; | |
4352 | } | |
4353 | ||
4354 | if (stopping_tracepoint | |
4355 | || trace_buffer_is_full | |
4356 | || expr_eval_result != expr_eval_no_error) | |
4357 | { | |
4358 | stop_tracing (); | |
4359 | break; | |
4360 | } | |
4361 | } | |
4362 | ||
4363 | return 1; | |
4364 | } | |
4365 | ||
fa593d66 PA |
4366 | /* Handle any internal tracing control breakpoint hits. That means, |
4367 | pull traceframes from the IPA to our buffer, and syncing both | |
4368 | tracing agents when the IPA's tracing stops for some reason. */ | |
4369 | ||
4370 | int | |
4371 | handle_tracepoint_bkpts (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
4372 | { | |
4373 | /* Pull in fast tracepoint trace frames from the inferior in-process | |
4374 | agent's buffer into our buffer. */ | |
4375 | ||
58b4daa5 | 4376 | if (!agent_loaded_p ()) |
fa593d66 PA |
4377 | return 0; |
4378 | ||
4379 | upload_fast_traceframes (); | |
4380 | ||
4381 | /* Check if the in-process agent had decided we should stop | |
4382 | tracing. */ | |
4383 | if (stop_pc == ipa_sym_addrs.addr_stop_tracing) | |
4384 | { | |
4385 | int ipa_trace_buffer_is_full; | |
4386 | CORE_ADDR ipa_stopping_tracepoint; | |
4387 | int ipa_expr_eval_result; | |
4388 | CORE_ADDR ipa_error_tracepoint; | |
4389 | ||
4390 | trace_debug ("lib stopped at stop_tracing"); | |
4391 | ||
4392 | read_inferior_integer (ipa_sym_addrs.addr_trace_buffer_is_full, | |
4393 | &ipa_trace_buffer_is_full); | |
4394 | ||
4395 | read_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, | |
4396 | &ipa_stopping_tracepoint); | |
4397 | write_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, 0); | |
4398 | ||
4399 | read_inferior_data_pointer (ipa_sym_addrs.addr_error_tracepoint, | |
4400 | &ipa_error_tracepoint); | |
4401 | write_inferior_data_pointer (ipa_sym_addrs.addr_error_tracepoint, 0); | |
4402 | ||
4403 | read_inferior_integer (ipa_sym_addrs.addr_expr_eval_result, | |
4404 | &ipa_expr_eval_result); | |
4405 | write_inferior_integer (ipa_sym_addrs.addr_expr_eval_result, 0); | |
4406 | ||
4407 | trace_debug ("lib: trace_buffer_is_full: %d, " | |
4408 | "stopping_tracepoint: %s, " | |
4409 | "ipa_expr_eval_result: %d, " | |
4410 | "error_tracepoint: %s, ", | |
4411 | ipa_trace_buffer_is_full, | |
4412 | paddress (ipa_stopping_tracepoint), | |
4413 | ipa_expr_eval_result, | |
4414 | paddress (ipa_error_tracepoint)); | |
4415 | ||
4416 | if (debug_threads) | |
4417 | { | |
4418 | if (ipa_trace_buffer_is_full) | |
4419 | trace_debug ("lib stopped due to full buffer."); | |
4420 | if (ipa_stopping_tracepoint) | |
4421 | trace_debug ("lib stopped due to tpoint"); | |
4422 | if (ipa_stopping_tracepoint) | |
4423 | trace_debug ("lib stopped due to error"); | |
4424 | } | |
4425 | ||
4426 | if (ipa_stopping_tracepoint != 0) | |
4427 | { | |
4428 | stopping_tracepoint | |
4429 | = fast_tracepoint_from_ipa_tpoint_address (ipa_stopping_tracepoint); | |
4430 | } | |
4431 | else if (ipa_expr_eval_result != expr_eval_no_error) | |
4432 | { | |
4433 | expr_eval_result = ipa_expr_eval_result; | |
4434 | error_tracepoint | |
4435 | = fast_tracepoint_from_ipa_tpoint_address (ipa_error_tracepoint); | |
4436 | } | |
4437 | stop_tracing (); | |
4438 | return 1; | |
4439 | } | |
4440 | else if (stop_pc == ipa_sym_addrs.addr_flush_trace_buffer) | |
4441 | { | |
4442 | trace_debug ("lib stopped at flush_trace_buffer"); | |
4443 | return 1; | |
4444 | } | |
4445 | ||
4446 | return 0; | |
4447 | } | |
4448 | ||
219f2f23 PA |
4449 | /* Return true if TINFO just hit a tracepoint. Collect data if |
4450 | so. */ | |
4451 | ||
4452 | int | |
4453 | tracepoint_was_hit (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
4454 | { | |
4455 | struct tracepoint *tpoint; | |
4456 | int ret = 0; | |
4457 | struct trap_tracepoint_ctx ctx; | |
4458 | ||
4459 | /* Not tracing, don't handle. */ | |
4460 | if (!tracing) | |
4461 | return 0; | |
4462 | ||
fa593d66 | 4463 | ctx.base.type = trap_tracepoint; |
219f2f23 PA |
4464 | ctx.regcache = get_thread_regcache (tinfo, 1); |
4465 | ||
4466 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
4467 | { | |
fa593d66 PA |
4468 | /* Note that we collect fast tracepoints here as well. We'll |
4469 | step over the fast tracepoint jump later, which avoids the | |
f72429c5 YQ |
4470 | double collect. However, we don't collect for static |
4471 | tracepoints here, because UST markers are compiled in program, | |
4472 | and probes will be executed in program. So static tracepoints | |
4473 | are collected there. */ | |
4474 | if (tpoint->enabled && stop_pc == tpoint->address | |
4475 | && tpoint->type != static_tracepoint) | |
219f2f23 PA |
4476 | { |
4477 | trace_debug ("Thread %s at address of tracepoint %d at 0x%s", | |
4478 | target_pid_to_str (tinfo->entry.id), | |
4479 | tpoint->number, paddress (tpoint->address)); | |
4480 | ||
4481 | /* Test the condition if present, and collect if true. */ | |
4482 | if (!tpoint->cond | |
4483 | || (condition_true_at_tracepoint | |
4484 | ((struct tracepoint_hit_ctx *) &ctx, tpoint))) | |
4485 | collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
4486 | stop_pc, tpoint); | |
4487 | ||
4488 | if (stopping_tracepoint | |
4489 | || trace_buffer_is_full | |
4490 | || expr_eval_result != expr_eval_no_error) | |
4491 | { | |
4492 | stop_tracing (); | |
4493 | } | |
4494 | /* If the tracepoint had a 'while-stepping' action, then set | |
4495 | the thread to collect this tracepoint on the following | |
4496 | single-steps. */ | |
4497 | else if (tpoint->step_count > 0) | |
4498 | { | |
4499 | add_while_stepping_state (tinfo, | |
4500 | tpoint->number, tpoint->address); | |
4501 | } | |
4502 | ||
4503 | ret = 1; | |
4504 | } | |
4505 | } | |
4506 | ||
4507 | return ret; | |
4508 | } | |
4509 | ||
fa593d66 PA |
4510 | #endif |
4511 | ||
0fb4aa4b PA |
4512 | #if defined IN_PROCESS_AGENT && defined HAVE_UST |
4513 | struct ust_marker_data; | |
4514 | static void collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
0fb4aa4b PA |
4515 | struct traceframe *tframe); |
4516 | #endif | |
4517 | ||
219f2f23 PA |
4518 | /* Create a trace frame for the hit of the given tracepoint in the |
4519 | given thread. */ | |
4520 | ||
4521 | static void | |
4522 | collect_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, CORE_ADDR stop_pc, | |
4523 | struct tracepoint *tpoint) | |
4524 | { | |
4525 | struct traceframe *tframe; | |
4526 | int acti; | |
4527 | ||
4528 | /* Only count it as a hit when we actually collect data. */ | |
4529 | tpoint->hit_count++; | |
4530 | ||
4531 | /* If we've exceeded a defined pass count, record the event for | |
4532 | later, and finish the collection for this hit. This test is only | |
4533 | for nonstepping tracepoints, stepping tracepoints test at the end | |
4534 | of their while-stepping loop. */ | |
4535 | if (tpoint->pass_count > 0 | |
4536 | && tpoint->hit_count >= tpoint->pass_count | |
4537 | && tpoint->step_count == 0 | |
4538 | && stopping_tracepoint == NULL) | |
4539 | stopping_tracepoint = tpoint; | |
4540 | ||
5f18041e | 4541 | trace_debug ("Making new traceframe for tracepoint %d at 0x%s, hit %" PRIu64, |
219f2f23 PA |
4542 | tpoint->number, paddress (tpoint->address), tpoint->hit_count); |
4543 | ||
4544 | tframe = add_traceframe (tpoint); | |
4545 | ||
4546 | if (tframe) | |
4547 | { | |
4548 | for (acti = 0; acti < tpoint->numactions; ++acti) | |
4549 | { | |
fa593d66 | 4550 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
4551 | trace_debug ("Tracepoint %d at 0x%s about to do action '%s'", |
4552 | tpoint->number, paddress (tpoint->address), | |
4553 | tpoint->actions_str[acti]); | |
fa593d66 | 4554 | #endif |
219f2f23 PA |
4555 | |
4556 | do_action_at_tracepoint (ctx, stop_pc, tpoint, tframe, | |
4557 | tpoint->actions[acti]); | |
4558 | } | |
4559 | ||
4560 | finish_traceframe (tframe); | |
4561 | } | |
4562 | ||
4563 | if (tframe == NULL && tracing) | |
4564 | trace_buffer_is_full = 1; | |
4565 | } | |
4566 | ||
fa593d66 PA |
4567 | #ifndef IN_PROCESS_AGENT |
4568 | ||
219f2f23 PA |
4569 | static void |
4570 | collect_data_at_step (struct tracepoint_hit_ctx *ctx, | |
4571 | CORE_ADDR stop_pc, | |
4572 | struct tracepoint *tpoint, int current_step) | |
4573 | { | |
4574 | struct traceframe *tframe; | |
4575 | int acti; | |
4576 | ||
4577 | trace_debug ("Making new step traceframe for " | |
5f18041e | 4578 | "tracepoint %d at 0x%s, step %d of %" PRIu64 ", hit %" PRIu64, |
219f2f23 PA |
4579 | tpoint->number, paddress (tpoint->address), |
4580 | current_step, tpoint->step_count, | |
4581 | tpoint->hit_count); | |
4582 | ||
4583 | tframe = add_traceframe (tpoint); | |
4584 | ||
4585 | if (tframe) | |
4586 | { | |
4587 | for (acti = 0; acti < tpoint->num_step_actions; ++acti) | |
4588 | { | |
4589 | trace_debug ("Tracepoint %d at 0x%s about to do step action '%s'", | |
4590 | tpoint->number, paddress (tpoint->address), | |
4591 | tpoint->step_actions_str[acti]); | |
4592 | ||
4593 | do_action_at_tracepoint (ctx, stop_pc, tpoint, tframe, | |
4594 | tpoint->step_actions[acti]); | |
4595 | } | |
4596 | ||
4597 | finish_traceframe (tframe); | |
4598 | } | |
4599 | ||
4600 | if (tframe == NULL && tracing) | |
4601 | trace_buffer_is_full = 1; | |
4602 | } | |
4603 | ||
fa593d66 PA |
4604 | #endif |
4605 | ||
219f2f23 PA |
4606 | static struct regcache * |
4607 | get_context_regcache (struct tracepoint_hit_ctx *ctx) | |
4608 | { | |
fa593d66 PA |
4609 | struct regcache *regcache = NULL; |
4610 | ||
4611 | #ifdef IN_PROCESS_AGENT | |
4612 | if (ctx->type == fast_tracepoint) | |
4613 | { | |
4614 | struct fast_tracepoint_ctx *fctx = (struct fast_tracepoint_ctx *) ctx; | |
4615 | if (!fctx->regcache_initted) | |
4616 | { | |
4617 | fctx->regcache_initted = 1; | |
4618 | init_register_cache (&fctx->regcache, fctx->regspace); | |
4619 | supply_regblock (&fctx->regcache, NULL); | |
4620 | supply_fast_tracepoint_registers (&fctx->regcache, fctx->regs); | |
4621 | } | |
4622 | regcache = &fctx->regcache; | |
4623 | } | |
0fb4aa4b PA |
4624 | #ifdef HAVE_UST |
4625 | if (ctx->type == static_tracepoint) | |
4626 | { | |
493e2a69 MS |
4627 | struct static_tracepoint_ctx *sctx |
4628 | = (struct static_tracepoint_ctx *) ctx; | |
4629 | ||
0fb4aa4b PA |
4630 | if (!sctx->regcache_initted) |
4631 | { | |
4632 | sctx->regcache_initted = 1; | |
4633 | init_register_cache (&sctx->regcache, sctx->regspace); | |
4634 | supply_regblock (&sctx->regcache, NULL); | |
4635 | /* Pass down the tracepoint address, because REGS doesn't | |
4636 | include the PC, but we know what it must have been. */ | |
4637 | supply_static_tracepoint_registers (&sctx->regcache, | |
4638 | (const unsigned char *) | |
4639 | sctx->regs, | |
4640 | sctx->tpoint->address); | |
4641 | } | |
4642 | regcache = &sctx->regcache; | |
4643 | } | |
4644 | #endif | |
fa593d66 PA |
4645 | #else |
4646 | if (ctx->type == trap_tracepoint) | |
4647 | { | |
4648 | struct trap_tracepoint_ctx *tctx = (struct trap_tracepoint_ctx *) ctx; | |
4649 | regcache = tctx->regcache; | |
4650 | } | |
4651 | #endif | |
219f2f23 PA |
4652 | |
4653 | gdb_assert (regcache != NULL); | |
4654 | ||
4655 | return regcache; | |
4656 | } | |
4657 | ||
4658 | static void | |
4659 | do_action_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
4660 | CORE_ADDR stop_pc, | |
4661 | struct tracepoint *tpoint, | |
4662 | struct traceframe *tframe, | |
4663 | struct tracepoint_action *taction) | |
4664 | { | |
4665 | enum eval_result_type err; | |
4666 | ||
4667 | switch (taction->type) | |
4668 | { | |
4669 | case 'M': | |
4670 | { | |
4671 | struct collect_memory_action *maction; | |
4672 | ||
4673 | maction = (struct collect_memory_action *) taction; | |
4674 | ||
4675 | trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)", | |
4676 | pulongest (maction->len), | |
4677 | paddress (maction->addr), maction->basereg); | |
4678 | /* (should use basereg) */ | |
4679 | agent_mem_read (tframe, NULL, | |
4680 | (CORE_ADDR) maction->addr, maction->len); | |
4681 | break; | |
4682 | } | |
4683 | case 'R': | |
4684 | { | |
219f2f23 PA |
4685 | unsigned char *regspace; |
4686 | struct regcache tregcache; | |
4687 | struct regcache *context_regcache; | |
4688 | ||
219f2f23 PA |
4689 | |
4690 | trace_debug ("Want to collect registers"); | |
4691 | ||
4692 | /* Collect all registers for now. */ | |
4693 | regspace = add_traceframe_block (tframe, | |
4694 | 1 + register_cache_size ()); | |
4695 | if (regspace == NULL) | |
4696 | { | |
4697 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
4698 | break; | |
4699 | } | |
4700 | /* Identify a register block. */ | |
4701 | *regspace = 'R'; | |
4702 | ||
4703 | context_regcache = get_context_regcache (ctx); | |
4704 | ||
4705 | /* Wrap the regblock in a register cache (in the stack, we | |
4706 | don't want to malloc here). */ | |
4707 | init_register_cache (&tregcache, regspace + 1); | |
4708 | ||
4709 | /* Copy the register data to the regblock. */ | |
4710 | regcache_cpy (&tregcache, context_regcache); | |
4711 | ||
fa593d66 | 4712 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
4713 | /* On some platforms, trap-based tracepoints will have the PC |
4714 | pointing to the next instruction after the trap, but we | |
4715 | don't want the user or GDB trying to guess whether the | |
4716 | saved PC needs adjusting; so always record the adjusted | |
4717 | stop_pc. Note that we can't use tpoint->address instead, | |
fa593d66 PA |
4718 | since it will be wrong for while-stepping actions. This |
4719 | adjustment is a nop for fast tracepoints collected from the | |
4720 | in-process lib (but not if GDBserver is collecting one | |
4721 | preemptively), since the PC had already been adjusted to | |
4722 | contain the tracepoint's address by the jump pad. */ | |
219f2f23 | 4723 | trace_debug ("Storing stop pc (0x%s) in regblock", |
8d00225b | 4724 | paddress (stop_pc)); |
219f2f23 PA |
4725 | |
4726 | /* This changes the regblock, not the thread's | |
4727 | regcache. */ | |
4728 | regcache_write_pc (&tregcache, stop_pc); | |
fa593d66 | 4729 | #endif |
219f2f23 PA |
4730 | } |
4731 | break; | |
4732 | case 'X': | |
4733 | { | |
4734 | struct eval_expr_action *eaction; | |
4735 | ||
4736 | eaction = (struct eval_expr_action *) taction; | |
4737 | ||
4738 | trace_debug ("Want to evaluate expression"); | |
4739 | ||
5e1dc496 | 4740 | err = eval_tracepoint_agent_expr (ctx, tframe, eaction->expr, NULL); |
219f2f23 PA |
4741 | |
4742 | if (err != expr_eval_no_error) | |
4743 | { | |
4744 | record_tracepoint_error (tpoint, "action expression", err); | |
4745 | return; | |
4746 | } | |
4747 | } | |
4748 | break; | |
0fb4aa4b PA |
4749 | case 'L': |
4750 | { | |
4751 | #if defined IN_PROCESS_AGENT && defined HAVE_UST | |
4752 | trace_debug ("Want to collect static trace data"); | |
19560ba5 | 4753 | collect_ust_data_at_tracepoint (ctx, tframe); |
0fb4aa4b PA |
4754 | #else |
4755 | trace_debug ("warning: collecting static trace data, " | |
4756 | "but static tracepoints are not supported"); | |
4757 | #endif | |
4758 | } | |
4759 | break; | |
219f2f23 PA |
4760 | default: |
4761 | trace_debug ("unknown trace action '%c', ignoring", taction->type); | |
4762 | break; | |
4763 | } | |
4764 | } | |
4765 | ||
4766 | static int | |
4767 | condition_true_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
4768 | struct tracepoint *tpoint) | |
4769 | { | |
4770 | ULONGEST value = 0; | |
4771 | enum eval_result_type err; | |
4772 | ||
c6beb2cb PA |
4773 | /* Presently, gdbserver doesn't run compiled conditions, only the |
4774 | IPA does. If the program stops at a fast tracepoint's address | |
4775 | (e.g., due to a breakpoint, trap tracepoint, or stepping), | |
4776 | gdbserver preemptively collect the fast tracepoint. Later, on | |
4777 | resume, gdbserver steps over the fast tracepoint like it steps | |
4778 | over breakpoints, so that the IPA doesn't see that fast | |
4779 | tracepoint. This avoids double collects of fast tracepoints in | |
4780 | that stopping scenario. Having gdbserver itself handle the fast | |
4781 | tracepoint gives the user a consistent view of when fast or trap | |
4782 | tracepoints are collected, compared to an alternative where only | |
4783 | trap tracepoints are collected on stop, and fast tracepoints on | |
4784 | resume. When a fast tracepoint is being processed by gdbserver, | |
4785 | it is always the non-compiled condition expression that is | |
4786 | used. */ | |
4787 | #ifdef IN_PROCESS_AGENT | |
6a271cae PA |
4788 | if (tpoint->compiled_cond) |
4789 | err = ((condfn) (uintptr_t) (tpoint->compiled_cond)) (ctx, &value); | |
4790 | else | |
c6beb2cb | 4791 | #endif |
5e1dc496 | 4792 | err = eval_tracepoint_agent_expr (ctx, NULL, tpoint->cond, &value); |
219f2f23 PA |
4793 | |
4794 | if (err != expr_eval_no_error) | |
4795 | { | |
4796 | record_tracepoint_error (tpoint, "condition", err); | |
4797 | /* The error case must return false. */ | |
4798 | return 0; | |
4799 | } | |
4800 | ||
4801 | trace_debug ("Tracepoint %d at 0x%s condition evals to %s", | |
4802 | tpoint->number, paddress (tpoint->address), | |
4803 | pulongest (value)); | |
4804 | return (value ? 1 : 0); | |
4805 | } | |
4806 | ||
5e1dc496 LM |
4807 | /* Evaluates a tracepoint agent expression with context CTX, |
4808 | traceframe TFRAME, agent expression AEXPR and store the | |
4809 | result in RSLT. */ | |
219f2f23 PA |
4810 | |
4811 | static enum eval_result_type | |
5e1dc496 LM |
4812 | eval_tracepoint_agent_expr (struct tracepoint_hit_ctx *ctx, |
4813 | struct traceframe *tframe, | |
4814 | struct agent_expr *aexpr, | |
4815 | ULONGEST *rslt) | |
4816 | { | |
4817 | struct regcache *regcache; | |
4818 | regcache = get_context_regcache (ctx); | |
219f2f23 | 4819 | |
5e1dc496 | 4820 | return gdb_eval_agent_expr (regcache, tframe, aexpr, rslt); |
219f2f23 PA |
4821 | } |
4822 | ||
4823 | /* Do memory copies for bytecodes. */ | |
4824 | /* Do the recording of memory blocks for actions and bytecodes. */ | |
4825 | ||
5e1dc496 | 4826 | int |
219f2f23 PA |
4827 | agent_mem_read (struct traceframe *tframe, |
4828 | unsigned char *to, CORE_ADDR from, ULONGEST len) | |
4829 | { | |
4830 | unsigned char *mspace; | |
4831 | ULONGEST remaining = len; | |
4832 | unsigned short blocklen; | |
4833 | ||
4834 | /* If a 'to' buffer is specified, use it. */ | |
4835 | if (to != NULL) | |
4836 | { | |
4837 | read_inferior_memory (from, to, len); | |
4838 | return 0; | |
4839 | } | |
4840 | ||
4841 | /* Otherwise, create a new memory block in the trace buffer. */ | |
4842 | while (remaining > 0) | |
4843 | { | |
4844 | size_t sp; | |
4845 | ||
4846 | blocklen = (remaining > 65535 ? 65535 : remaining); | |
4847 | sp = 1 + sizeof (from) + sizeof (blocklen) + blocklen; | |
4848 | mspace = add_traceframe_block (tframe, sp); | |
4849 | if (mspace == NULL) | |
4850 | return 1; | |
4851 | /* Identify block as a memory block. */ | |
4852 | *mspace = 'M'; | |
4853 | ++mspace; | |
4854 | /* Record address and size. */ | |
4855 | memcpy (mspace, &from, sizeof (from)); | |
4856 | mspace += sizeof (from); | |
4857 | memcpy (mspace, &blocklen, sizeof (blocklen)); | |
4858 | mspace += sizeof (blocklen); | |
4859 | /* Record the memory block proper. */ | |
4860 | read_inferior_memory (from, mspace, blocklen); | |
4861 | trace_debug ("%d bytes recorded", blocklen); | |
4862 | remaining -= blocklen; | |
4863 | from += blocklen; | |
4864 | } | |
4865 | return 0; | |
4866 | } | |
4867 | ||
5e1dc496 | 4868 | int |
3065dfb6 SS |
4869 | agent_mem_read_string (struct traceframe *tframe, |
4870 | unsigned char *to, CORE_ADDR from, ULONGEST len) | |
4871 | { | |
4872 | unsigned char *buf, *mspace; | |
4873 | ULONGEST remaining = len; | |
4874 | unsigned short blocklen, i; | |
4875 | ||
4876 | /* To save a bit of space, block lengths are 16-bit, so break large | |
4877 | requests into multiple blocks. Bordering on overkill for strings, | |
4878 | but it could happen that someone specifies a large max length. */ | |
4879 | while (remaining > 0) | |
4880 | { | |
4881 | size_t sp; | |
4882 | ||
4883 | blocklen = (remaining > 65535 ? 65535 : remaining); | |
4884 | /* We want working space to accumulate nonzero bytes, since | |
4885 | traceframes must have a predecided size (otherwise it gets | |
4886 | harder to wrap correctly for the circular case, etc). */ | |
4887 | buf = (unsigned char *) xmalloc (blocklen + 1); | |
4888 | for (i = 0; i < blocklen; ++i) | |
4889 | { | |
4890 | /* Read the string one byte at a time, in case the string is | |
4891 | at the end of a valid memory area - we don't want a | |
4892 | correctly-terminated string to engender segvio | |
4893 | complaints. */ | |
4894 | read_inferior_memory (from + i, buf + i, 1); | |
4895 | ||
4896 | if (buf[i] == '\0') | |
4897 | { | |
4898 | blocklen = i + 1; | |
4899 | /* Make sure outer loop stops now too. */ | |
4900 | remaining = blocklen; | |
4901 | break; | |
4902 | } | |
4903 | } | |
4904 | sp = 1 + sizeof (from) + sizeof (blocklen) + blocklen; | |
4905 | mspace = add_traceframe_block (tframe, sp); | |
4906 | if (mspace == NULL) | |
4907 | { | |
4908 | xfree (buf); | |
4909 | return 1; | |
4910 | } | |
4911 | /* Identify block as a memory block. */ | |
4912 | *mspace = 'M'; | |
4913 | ++mspace; | |
4914 | /* Record address and size. */ | |
4915 | memcpy ((void *) mspace, (void *) &from, sizeof (from)); | |
4916 | mspace += sizeof (from); | |
4917 | memcpy ((void *) mspace, (void *) &blocklen, sizeof (blocklen)); | |
4918 | mspace += sizeof (blocklen); | |
4919 | /* Copy the string contents. */ | |
4920 | memcpy ((void *) mspace, (void *) buf, blocklen); | |
4921 | remaining -= blocklen; | |
4922 | from += blocklen; | |
4923 | xfree (buf); | |
4924 | } | |
4925 | return 0; | |
4926 | } | |
4927 | ||
219f2f23 PA |
4928 | /* Record the value of a trace state variable. */ |
4929 | ||
5e1dc496 | 4930 | int |
219f2f23 PA |
4931 | agent_tsv_read (struct traceframe *tframe, int n) |
4932 | { | |
4933 | unsigned char *vspace; | |
4934 | LONGEST val; | |
4935 | ||
4936 | vspace = add_traceframe_block (tframe, | |
4937 | 1 + sizeof (n) + sizeof (LONGEST)); | |
4938 | if (vspace == NULL) | |
4939 | return 1; | |
4940 | /* Identify block as a variable. */ | |
4941 | *vspace = 'V'; | |
4942 | /* Record variable's number and value. */ | |
4943 | memcpy (vspace + 1, &n, sizeof (n)); | |
4944 | val = get_trace_state_variable_value (n); | |
4945 | memcpy (vspace + 1 + sizeof (n), &val, sizeof (val)); | |
4946 | trace_debug ("Variable %d recorded", n); | |
4947 | return 0; | |
4948 | } | |
4949 | ||
fa593d66 PA |
4950 | #ifndef IN_PROCESS_AGENT |
4951 | ||
b3b9301e PA |
4952 | /* Callback for traceframe_walk_blocks, used to find a given block |
4953 | type in a traceframe. */ | |
4954 | ||
4955 | static int | |
4956 | match_blocktype (char blocktype, unsigned char *dataptr, void *data) | |
4957 | { | |
4958 | char *wantedp = data; | |
4959 | ||
4960 | if (*wantedp == blocktype) | |
4961 | return 1; | |
4962 | ||
4963 | return 0; | |
4964 | } | |
4965 | ||
4966 | /* Walk over all traceframe blocks of the traceframe buffer starting | |
4967 | at DATABASE, of DATASIZE bytes long, and call CALLBACK for each | |
4968 | block found, passing in DATA unmodified. If CALLBACK returns true, | |
4969 | this returns a pointer to where the block is found. Returns NULL | |
4970 | if no callback call returned true, indicating that all blocks have | |
4971 | been walked. */ | |
4972 | ||
219f2f23 | 4973 | static unsigned char * |
b3b9301e PA |
4974 | traceframe_walk_blocks (unsigned char *database, unsigned int datasize, |
4975 | int tfnum, | |
4976 | int (*callback) (char blocktype, | |
4977 | unsigned char *dataptr, | |
4978 | void *data), | |
4979 | void *data) | |
219f2f23 PA |
4980 | { |
4981 | unsigned char *dataptr; | |
4982 | ||
4983 | if (datasize == 0) | |
4984 | { | |
4985 | trace_debug ("traceframe %d has no data", tfnum); | |
4986 | return NULL; | |
4987 | } | |
4988 | ||
4989 | /* Iterate through a traceframe's blocks, looking for a block of the | |
4990 | requested type. */ | |
4991 | for (dataptr = database; | |
4992 | dataptr < database + datasize; | |
4993 | /* nothing */) | |
4994 | { | |
4995 | char blocktype; | |
4996 | unsigned short mlen; | |
4997 | ||
4998 | if (dataptr == trace_buffer_wrap) | |
4999 | { | |
5000 | /* Adjust to reflect wrapping part of the frame around to | |
5001 | the beginning. */ | |
5002 | datasize = dataptr - database; | |
5003 | dataptr = database = trace_buffer_lo; | |
5004 | } | |
b3b9301e | 5005 | |
219f2f23 PA |
5006 | blocktype = *dataptr++; |
5007 | ||
b3b9301e | 5008 | if ((*callback) (blocktype, dataptr, data)) |
219f2f23 PA |
5009 | return dataptr; |
5010 | ||
5011 | switch (blocktype) | |
5012 | { | |
5013 | case 'R': | |
5014 | /* Skip over the registers block. */ | |
5015 | dataptr += register_cache_size (); | |
5016 | break; | |
5017 | case 'M': | |
5018 | /* Skip over the memory block. */ | |
5019 | dataptr += sizeof (CORE_ADDR); | |
5020 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5021 | dataptr += (sizeof (mlen) + mlen); | |
5022 | break; | |
219f2f23 PA |
5023 | case 'V': |
5024 | /* Skip over the TSV block. */ | |
5025 | dataptr += (sizeof (int) + sizeof (LONGEST)); | |
5026 | break; | |
0fb4aa4b PA |
5027 | case 'S': |
5028 | /* Skip over the static trace data block. */ | |
5029 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5030 | dataptr += (sizeof (mlen) + mlen); | |
5031 | break; | |
219f2f23 PA |
5032 | default: |
5033 | trace_debug ("traceframe %d has unknown block type 0x%x", | |
5034 | tfnum, blocktype); | |
5035 | return NULL; | |
5036 | } | |
5037 | } | |
5038 | ||
5039 | return NULL; | |
5040 | } | |
5041 | ||
b3b9301e PA |
5042 | /* Look for the block of type TYPE_WANTED in the trameframe starting |
5043 | at DATABASE of DATASIZE bytes long. TFNUM is the traceframe | |
5044 | number. */ | |
5045 | ||
5046 | static unsigned char * | |
5047 | traceframe_find_block_type (unsigned char *database, unsigned int datasize, | |
5048 | int tfnum, char type_wanted) | |
5049 | { | |
5050 | return traceframe_walk_blocks (database, datasize, tfnum, | |
5051 | match_blocktype, &type_wanted); | |
5052 | } | |
5053 | ||
219f2f23 PA |
5054 | static unsigned char * |
5055 | traceframe_find_regblock (struct traceframe *tframe, int tfnum) | |
5056 | { | |
5057 | unsigned char *regblock; | |
5058 | ||
5059 | regblock = traceframe_find_block_type (tframe->data, | |
5060 | tframe->data_size, | |
5061 | tfnum, 'R'); | |
5062 | ||
5063 | if (regblock == NULL) | |
5064 | trace_debug ("traceframe %d has no register data", tfnum); | |
5065 | ||
5066 | return regblock; | |
5067 | } | |
5068 | ||
5069 | /* Get registers from a traceframe. */ | |
5070 | ||
5071 | int | |
5072 | fetch_traceframe_registers (int tfnum, struct regcache *regcache, int regnum) | |
5073 | { | |
5074 | unsigned char *dataptr; | |
5075 | struct tracepoint *tpoint; | |
5076 | struct traceframe *tframe; | |
5077 | ||
5078 | tframe = find_traceframe (tfnum); | |
5079 | ||
5080 | if (tframe == NULL) | |
5081 | { | |
5082 | trace_debug ("traceframe %d not found", tfnum); | |
5083 | return 1; | |
5084 | } | |
5085 | ||
5086 | dataptr = traceframe_find_regblock (tframe, tfnum); | |
5087 | if (dataptr == NULL) | |
5088 | { | |
1c79eb8a | 5089 | /* Mark registers unavailable. */ |
219f2f23 PA |
5090 | supply_regblock (regcache, NULL); |
5091 | ||
5092 | /* We can generally guess at a PC, although this will be | |
5093 | misleading for while-stepping frames and multi-location | |
5094 | tracepoints. */ | |
5095 | tpoint = find_next_tracepoint_by_number (NULL, tframe->tpnum); | |
5096 | if (tpoint != NULL) | |
5097 | regcache_write_pc (regcache, tpoint->address); | |
5098 | } | |
5099 | else | |
5100 | supply_regblock (regcache, dataptr); | |
5101 | ||
5102 | return 0; | |
5103 | } | |
5104 | ||
5105 | static CORE_ADDR | |
5106 | traceframe_get_pc (struct traceframe *tframe) | |
5107 | { | |
5108 | struct regcache regcache; | |
5109 | unsigned char *dataptr; | |
5110 | ||
5111 | dataptr = traceframe_find_regblock (tframe, -1); | |
5112 | if (dataptr == NULL) | |
5113 | return 0; | |
5114 | ||
5115 | init_register_cache (®cache, dataptr); | |
5116 | return regcache_read_pc (®cache); | |
5117 | } | |
5118 | ||
5119 | /* Read a requested block of memory from a trace frame. */ | |
5120 | ||
5121 | int | |
5122 | traceframe_read_mem (int tfnum, CORE_ADDR addr, | |
5123 | unsigned char *buf, ULONGEST length, | |
5124 | ULONGEST *nbytes) | |
5125 | { | |
5126 | struct traceframe *tframe; | |
5127 | unsigned char *database, *dataptr; | |
5128 | unsigned int datasize; | |
5129 | CORE_ADDR maddr; | |
5130 | unsigned short mlen; | |
5131 | ||
5132 | trace_debug ("traceframe_read_mem"); | |
5133 | ||
5134 | tframe = find_traceframe (tfnum); | |
5135 | ||
5136 | if (!tframe) | |
5137 | { | |
5138 | trace_debug ("traceframe %d not found", tfnum); | |
5139 | return 1; | |
5140 | } | |
5141 | ||
5142 | datasize = tframe->data_size; | |
5143 | database = dataptr = &tframe->data[0]; | |
5144 | ||
5145 | /* Iterate through a traceframe's blocks, looking for memory. */ | |
5146 | while ((dataptr = traceframe_find_block_type (dataptr, | |
493e2a69 MS |
5147 | datasize |
5148 | - (dataptr - database), | |
219f2f23 PA |
5149 | tfnum, 'M')) != NULL) |
5150 | { | |
5151 | memcpy (&maddr, dataptr, sizeof (maddr)); | |
5152 | dataptr += sizeof (maddr); | |
5153 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5154 | dataptr += sizeof (mlen); | |
5155 | trace_debug ("traceframe %d has %d bytes at %s", | |
5156 | tfnum, mlen, paddress (maddr)); | |
5157 | ||
764880b7 PA |
5158 | /* If the block includes the first part of the desired range, |
5159 | return as much it has; GDB will re-request the remainder, | |
5160 | which might be in a different block of this trace frame. */ | |
5161 | if (maddr <= addr && addr < (maddr + mlen)) | |
219f2f23 | 5162 | { |
764880b7 PA |
5163 | ULONGEST amt = (maddr + mlen) - addr; |
5164 | if (amt > length) | |
5165 | amt = length; | |
5166 | ||
5167 | memcpy (buf, dataptr + (addr - maddr), amt); | |
5168 | *nbytes = amt; | |
219f2f23 PA |
5169 | return 0; |
5170 | } | |
5171 | ||
5172 | /* Skip over this block. */ | |
5173 | dataptr += mlen; | |
5174 | } | |
5175 | ||
5176 | trace_debug ("traceframe %d has no memory data for the desired region", | |
5177 | tfnum); | |
5178 | ||
5179 | *nbytes = 0; | |
5180 | return 0; | |
5181 | } | |
5182 | ||
5183 | static int | |
5184 | traceframe_read_tsv (int tsvnum, LONGEST *val) | |
5185 | { | |
5186 | int tfnum; | |
5187 | struct traceframe *tframe; | |
5188 | unsigned char *database, *dataptr; | |
5189 | unsigned int datasize; | |
5190 | int vnum; | |
5191 | ||
5192 | trace_debug ("traceframe_read_tsv"); | |
5193 | ||
5194 | tfnum = current_traceframe; | |
5195 | ||
5196 | if (tfnum < 0) | |
5197 | { | |
5198 | trace_debug ("no current traceframe"); | |
5199 | return 1; | |
5200 | } | |
5201 | ||
5202 | tframe = find_traceframe (tfnum); | |
5203 | ||
5204 | if (tframe == NULL) | |
5205 | { | |
5206 | trace_debug ("traceframe %d not found", tfnum); | |
5207 | return 1; | |
5208 | } | |
5209 | ||
5210 | datasize = tframe->data_size; | |
5211 | database = dataptr = &tframe->data[0]; | |
5212 | ||
5213 | /* Iterate through a traceframe's blocks, looking for the tsv. */ | |
5214 | while ((dataptr = traceframe_find_block_type (dataptr, | |
493e2a69 MS |
5215 | datasize |
5216 | - (dataptr - database), | |
219f2f23 PA |
5217 | tfnum, 'V')) != NULL) |
5218 | { | |
5219 | memcpy (&vnum, dataptr, sizeof (vnum)); | |
5220 | dataptr += sizeof (vnum); | |
5221 | ||
5222 | trace_debug ("traceframe %d has variable %d", tfnum, vnum); | |
5223 | ||
5224 | /* Check that this is the variable we want. */ | |
5225 | if (tsvnum == vnum) | |
5226 | { | |
5227 | memcpy (val, dataptr, sizeof (*val)); | |
5228 | return 0; | |
5229 | } | |
5230 | ||
5231 | /* Skip over this block. */ | |
5232 | dataptr += sizeof (LONGEST); | |
5233 | } | |
5234 | ||
5235 | trace_debug ("traceframe %d has no data for variable %d", | |
5236 | tfnum, tsvnum); | |
5237 | return 1; | |
5238 | } | |
5239 | ||
0fb4aa4b PA |
5240 | /* Read a requested block of static tracepoint data from a trace |
5241 | frame. */ | |
5242 | ||
5243 | int | |
5244 | traceframe_read_sdata (int tfnum, ULONGEST offset, | |
5245 | unsigned char *buf, ULONGEST length, | |
5246 | ULONGEST *nbytes) | |
5247 | { | |
5248 | struct traceframe *tframe; | |
5249 | unsigned char *database, *dataptr; | |
5250 | unsigned int datasize; | |
5251 | unsigned short mlen; | |
5252 | ||
5253 | trace_debug ("traceframe_read_sdata"); | |
5254 | ||
5255 | tframe = find_traceframe (tfnum); | |
5256 | ||
5257 | if (!tframe) | |
5258 | { | |
5259 | trace_debug ("traceframe %d not found", tfnum); | |
5260 | return 1; | |
5261 | } | |
5262 | ||
5263 | datasize = tframe->data_size; | |
5264 | database = &tframe->data[0]; | |
5265 | ||
5266 | /* Iterate through a traceframe's blocks, looking for static | |
5267 | tracepoint data. */ | |
5268 | dataptr = traceframe_find_block_type (database, datasize, | |
5269 | tfnum, 'S'); | |
5270 | if (dataptr != NULL) | |
5271 | { | |
5272 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5273 | dataptr += sizeof (mlen); | |
5274 | if (offset < mlen) | |
5275 | { | |
5276 | if (offset + length > mlen) | |
5277 | length = mlen - offset; | |
5278 | ||
5279 | memcpy (buf, dataptr, length); | |
5280 | *nbytes = length; | |
5281 | } | |
5282 | else | |
5283 | *nbytes = 0; | |
5284 | return 0; | |
5285 | } | |
5286 | ||
5287 | trace_debug ("traceframe %d has no static trace data", tfnum); | |
5288 | ||
5289 | *nbytes = 0; | |
5290 | return 0; | |
5291 | } | |
5292 | ||
b3b9301e PA |
5293 | /* Callback for traceframe_walk_blocks. Builds a traceframe-info |
5294 | object. DATA is pointer to a struct buffer holding the | |
5295 | traceframe-info object being built. */ | |
5296 | ||
5297 | static int | |
5298 | build_traceframe_info_xml (char blocktype, unsigned char *dataptr, void *data) | |
5299 | { | |
5300 | struct buffer *buffer = data; | |
5301 | ||
5302 | switch (blocktype) | |
5303 | { | |
5304 | case 'M': | |
5305 | { | |
5306 | unsigned short mlen; | |
5307 | CORE_ADDR maddr; | |
5308 | ||
5309 | memcpy (&maddr, dataptr, sizeof (maddr)); | |
5310 | dataptr += sizeof (maddr); | |
5311 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5312 | dataptr += sizeof (mlen); | |
5313 | buffer_xml_printf (buffer, | |
5314 | "<memory start=\"0x%s\" length=\"0x%s\"/>\n", | |
5315 | paddress (maddr), phex_nz (mlen, sizeof (mlen))); | |
5316 | break; | |
5317 | } | |
5318 | case 'V': | |
5319 | case 'R': | |
5320 | case 'S': | |
5321 | { | |
5322 | break; | |
5323 | } | |
5324 | default: | |
5325 | warning ("Unhandled trace block type (%d) '%c ' " | |
5326 | "while building trace frame info.", | |
5327 | blocktype, blocktype); | |
5328 | break; | |
5329 | } | |
5330 | ||
5331 | return 0; | |
5332 | } | |
5333 | ||
5334 | /* Build a traceframe-info object for traceframe number TFNUM into | |
5335 | BUFFER. */ | |
5336 | ||
5337 | int | |
5338 | traceframe_read_info (int tfnum, struct buffer *buffer) | |
5339 | { | |
5340 | struct traceframe *tframe; | |
5341 | ||
5342 | trace_debug ("traceframe_read_info"); | |
5343 | ||
5344 | tframe = find_traceframe (tfnum); | |
5345 | ||
5346 | if (!tframe) | |
5347 | { | |
5348 | trace_debug ("traceframe %d not found", tfnum); | |
5349 | return 1; | |
5350 | } | |
5351 | ||
5352 | buffer_grow_str (buffer, "<traceframe-info>\n"); | |
5353 | traceframe_walk_blocks (tframe->data, tframe->data_size, | |
5354 | tfnum, build_traceframe_info_xml, buffer); | |
5355 | buffer_grow_str0 (buffer, "</traceframe-info>\n"); | |
5356 | return 0; | |
5357 | } | |
5358 | ||
fa593d66 PA |
5359 | /* Return the first fast tracepoint whose jump pad contains PC. */ |
5360 | ||
5361 | static struct tracepoint * | |
5362 | fast_tracepoint_from_jump_pad_address (CORE_ADDR pc) | |
5363 | { | |
5364 | struct tracepoint *tpoint; | |
5365 | ||
5366 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
5367 | if (tpoint->type == fast_tracepoint) | |
5368 | if (tpoint->jump_pad <= pc && pc < tpoint->jump_pad_end) | |
5369 | return tpoint; | |
5370 | ||
5371 | return NULL; | |
5372 | } | |
5373 | ||
405f8e94 SS |
5374 | /* Return the first fast tracepoint whose trampoline contains PC. */ |
5375 | ||
5376 | static struct tracepoint * | |
5377 | fast_tracepoint_from_trampoline_address (CORE_ADDR pc) | |
5378 | { | |
5379 | struct tracepoint *tpoint; | |
5380 | ||
5381 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
5382 | { | |
5383 | if (tpoint->type == fast_tracepoint | |
5384 | && tpoint->trampoline <= pc && pc < tpoint->trampoline_end) | |
5385 | return tpoint; | |
5386 | } | |
5387 | ||
5388 | return NULL; | |
5389 | } | |
5390 | ||
fa593d66 PA |
5391 | /* Return GDBserver's tracepoint that matches the IP Agent's |
5392 | tracepoint object that lives at IPA_TPOINT_OBJ in the IP Agent's | |
5393 | address space. */ | |
5394 | ||
5395 | static struct tracepoint * | |
5396 | fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR ipa_tpoint_obj) | |
5397 | { | |
5398 | struct tracepoint *tpoint; | |
5399 | ||
5400 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
5401 | if (tpoint->type == fast_tracepoint) | |
5402 | if (tpoint->obj_addr_on_target == ipa_tpoint_obj) | |
5403 | return tpoint; | |
5404 | ||
5405 | return NULL; | |
5406 | } | |
5407 | ||
5408 | #endif | |
5409 | ||
5410 | /* The type of the object that is used to synchronize fast tracepoint | |
5411 | collection. */ | |
5412 | ||
5413 | typedef struct collecting_t | |
5414 | { | |
5415 | /* The fast tracepoint number currently collecting. */ | |
5416 | uintptr_t tpoint; | |
5417 | ||
5418 | /* A number that GDBserver can use to identify the thread that is | |
5419 | presently holding the collect lock. This need not (and usually | |
5420 | is not) the thread id, as getting the current thread ID usually | |
5421 | requires a system call, which we want to avoid like the plague. | |
5422 | Usually this is thread's TCB, found in the TLS (pseudo-) | |
5423 | register, which is readable with a single insn on several | |
5424 | architectures. */ | |
5425 | uintptr_t thread_area; | |
5426 | } collecting_t; | |
5427 | ||
5428 | #ifndef IN_PROCESS_AGENT | |
5429 | ||
5430 | void | |
5431 | force_unlock_trace_buffer (void) | |
5432 | { | |
5433 | write_inferior_data_pointer (ipa_sym_addrs.addr_collecting, 0); | |
5434 | } | |
5435 | ||
5436 | /* Check if the thread identified by THREAD_AREA which is stopped at | |
5437 | STOP_PC, is presently locking the fast tracepoint collection, and | |
5438 | if so, gather some status of said collection. Returns 0 if the | |
5439 | thread isn't collecting or in the jump pad at all. 1, if in the | |
5440 | jump pad (or within gdb_collect) and hasn't executed the adjusted | |
5441 | original insn yet (can set a breakpoint there and run to it). 2, | |
5442 | if presently executing the adjusted original insn --- in which | |
5443 | case, if we want to move the thread out of the jump pad, we need to | |
5444 | single-step it until this function returns 0. */ | |
5445 | ||
5446 | int | |
5447 | fast_tracepoint_collecting (CORE_ADDR thread_area, | |
5448 | CORE_ADDR stop_pc, | |
5449 | struct fast_tpoint_collect_status *status) | |
5450 | { | |
5451 | CORE_ADDR ipa_collecting; | |
5452 | CORE_ADDR ipa_gdb_jump_pad_buffer, ipa_gdb_jump_pad_buffer_end; | |
405f8e94 SS |
5453 | CORE_ADDR ipa_gdb_trampoline_buffer; |
5454 | CORE_ADDR ipa_gdb_trampoline_buffer_end; | |
fa593d66 PA |
5455 | struct tracepoint *tpoint; |
5456 | int needs_breakpoint; | |
5457 | ||
5458 | /* The thread THREAD_AREA is either: | |
5459 | ||
5460 | 0. not collecting at all, not within the jump pad, or within | |
5461 | gdb_collect or one of its callees. | |
5462 | ||
5463 | 1. in the jump pad and haven't reached gdb_collect | |
5464 | ||
5465 | 2. within gdb_collect (out of the jump pad) (collect is set) | |
5466 | ||
5467 | 3. we're in the jump pad, after gdb_collect having returned, | |
5468 | possibly executing the adjusted insns. | |
5469 | ||
5470 | For cases 1 and 3, `collecting' may or not be set. The jump pad | |
5471 | doesn't have any complicated jump logic, so we can tell if the | |
5472 | thread is executing the adjust original insn or not by just | |
5473 | matching STOP_PC with known jump pad addresses. If we it isn't | |
5474 | yet executing the original insn, set a breakpoint there, and let | |
5475 | the thread run to it, so to quickly step over a possible (many | |
5476 | insns) gdb_collect call. Otherwise, or when the breakpoint is | |
5477 | hit, only a few (small number of) insns are left to be executed | |
5478 | in the jump pad. Single-step the thread until it leaves the | |
5479 | jump pad. */ | |
5480 | ||
5481 | again: | |
5482 | tpoint = NULL; | |
5483 | needs_breakpoint = 0; | |
5484 | trace_debug ("fast_tracepoint_collecting"); | |
5485 | ||
5486 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer, | |
5487 | &ipa_gdb_jump_pad_buffer)) | |
5488 | fatal ("error extracting `gdb_jump_pad_buffer'"); | |
5489 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer_end, | |
5490 | &ipa_gdb_jump_pad_buffer_end)) | |
5491 | fatal ("error extracting `gdb_jump_pad_buffer_end'"); | |
5492 | ||
405f8e94 SS |
5493 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer, |
5494 | &ipa_gdb_trampoline_buffer)) | |
5495 | fatal ("error extracting `gdb_trampoline_buffer'"); | |
5496 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_end, | |
5497 | &ipa_gdb_trampoline_buffer_end)) | |
5498 | fatal ("error extracting `gdb_trampoline_buffer_end'"); | |
5499 | ||
493e2a69 MS |
5500 | if (ipa_gdb_jump_pad_buffer <= stop_pc |
5501 | && stop_pc < ipa_gdb_jump_pad_buffer_end) | |
fa593d66 PA |
5502 | { |
5503 | /* We can tell which tracepoint(s) the thread is collecting by | |
5504 | matching the jump pad address back to the tracepoint. */ | |
5505 | tpoint = fast_tracepoint_from_jump_pad_address (stop_pc); | |
5506 | if (tpoint == NULL) | |
5507 | { | |
5508 | warning ("in jump pad, but no matching tpoint?"); | |
5509 | return 0; | |
5510 | } | |
5511 | else | |
5512 | { | |
5513 | trace_debug ("in jump pad of tpoint (%d, %s); jump_pad(%s, %s); " | |
5514 | "adj_insn(%s, %s)", | |
5515 | tpoint->number, paddress (tpoint->address), | |
5516 | paddress (tpoint->jump_pad), | |
5517 | paddress (tpoint->jump_pad_end), | |
5518 | paddress (tpoint->adjusted_insn_addr), | |
5519 | paddress (tpoint->adjusted_insn_addr_end)); | |
5520 | } | |
5521 | ||
5522 | /* Definitely in the jump pad. May or may not need | |
5523 | fast-exit-jump-pad breakpoint. */ | |
5524 | if (tpoint->jump_pad <= stop_pc | |
5525 | && stop_pc < tpoint->adjusted_insn_addr) | |
5526 | needs_breakpoint = 1; | |
5527 | } | |
405f8e94 SS |
5528 | else if (ipa_gdb_trampoline_buffer <= stop_pc |
5529 | && stop_pc < ipa_gdb_trampoline_buffer_end) | |
5530 | { | |
5531 | /* We can tell which tracepoint(s) the thread is collecting by | |
5532 | matching the trampoline address back to the tracepoint. */ | |
5533 | tpoint = fast_tracepoint_from_trampoline_address (stop_pc); | |
5534 | if (tpoint == NULL) | |
5535 | { | |
5536 | warning ("in trampoline, but no matching tpoint?"); | |
5537 | return 0; | |
5538 | } | |
5539 | else | |
5540 | { | |
5541 | trace_debug ("in trampoline of tpoint (%d, %s); trampoline(%s, %s)", | |
5542 | tpoint->number, paddress (tpoint->address), | |
5543 | paddress (tpoint->trampoline), | |
5544 | paddress (tpoint->trampoline_end)); | |
5545 | } | |
5546 | ||
5547 | /* Have not reached jump pad yet, but treat the trampoline as a | |
5548 | part of the jump pad that is before the adjusted original | |
5549 | instruction. */ | |
5550 | needs_breakpoint = 1; | |
5551 | } | |
fa593d66 PA |
5552 | else |
5553 | { | |
5554 | collecting_t ipa_collecting_obj; | |
5555 | ||
5556 | /* If `collecting' is set/locked, then the THREAD_AREA thread | |
5557 | may or not be the one holding the lock. We have to read the | |
5558 | lock to find out. */ | |
5559 | ||
5560 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_collecting, | |
5561 | &ipa_collecting)) | |
5562 | { | |
5563 | trace_debug ("fast_tracepoint_collecting:" | |
5564 | " failed reading 'collecting' in the inferior"); | |
5565 | return 0; | |
5566 | } | |
5567 | ||
5568 | if (!ipa_collecting) | |
5569 | { | |
5570 | trace_debug ("fast_tracepoint_collecting: not collecting" | |
5571 | " (and nobody is)."); | |
5572 | return 0; | |
5573 | } | |
5574 | ||
5575 | /* Some thread is collecting. Check which. */ | |
5576 | if (read_inferior_memory (ipa_collecting, | |
5577 | (unsigned char *) &ipa_collecting_obj, | |
5578 | sizeof (ipa_collecting_obj)) != 0) | |
5579 | goto again; | |
5580 | ||
5581 | if (ipa_collecting_obj.thread_area != thread_area) | |
5582 | { | |
5583 | trace_debug ("fast_tracepoint_collecting: not collecting " | |
5584 | "(another thread is)"); | |
5585 | return 0; | |
5586 | } | |
5587 | ||
5588 | tpoint | |
5589 | = fast_tracepoint_from_ipa_tpoint_address (ipa_collecting_obj.tpoint); | |
5590 | if (tpoint == NULL) | |
5591 | { | |
5592 | warning ("fast_tracepoint_collecting: collecting, " | |
5593 | "but tpoint %s not found?", | |
5594 | paddress ((CORE_ADDR) ipa_collecting_obj.tpoint)); | |
5595 | return 0; | |
5596 | } | |
5597 | ||
5598 | /* The thread is within `gdb_collect', skip over the rest of | |
5599 | fast tracepoint collection quickly using a breakpoint. */ | |
5600 | needs_breakpoint = 1; | |
5601 | } | |
5602 | ||
5603 | /* The caller wants a bit of status detail. */ | |
5604 | if (status != NULL) | |
5605 | { | |
5606 | status->tpoint_num = tpoint->number; | |
5607 | status->tpoint_addr = tpoint->address; | |
5608 | status->adjusted_insn_addr = tpoint->adjusted_insn_addr; | |
5609 | status->adjusted_insn_addr_end = tpoint->adjusted_insn_addr_end; | |
5610 | } | |
5611 | ||
5612 | if (needs_breakpoint) | |
5613 | { | |
5614 | /* Hasn't executed the original instruction yet. Set breakpoint | |
5615 | there, and wait till it's hit, then single-step until exiting | |
5616 | the jump pad. */ | |
5617 | ||
5618 | trace_debug ("\ | |
5619 | fast_tracepoint_collecting, returning continue-until-break at %s", | |
5620 | paddress (tpoint->adjusted_insn_addr)); | |
5621 | ||
5622 | return 1; /* continue */ | |
5623 | } | |
5624 | else | |
5625 | { | |
5626 | /* Just single-step until exiting the jump pad. */ | |
5627 | ||
5628 | trace_debug ("fast_tracepoint_collecting, returning " | |
5629 | "need-single-step (%s-%s)", | |
5630 | paddress (tpoint->adjusted_insn_addr), | |
5631 | paddress (tpoint->adjusted_insn_addr_end)); | |
5632 | ||
5633 | return 2; /* single-step */ | |
5634 | } | |
5635 | } | |
5636 | ||
5637 | #endif | |
5638 | ||
5639 | #ifdef IN_PROCESS_AGENT | |
5640 | ||
5641 | /* The global fast tracepoint collect lock. Points to a collecting_t | |
5642 | object built on the stack by the jump pad, if presently locked; | |
5643 | NULL if it isn't locked. Note that this lock *must* be set while | |
5644 | executing any *function other than the jump pad. See | |
5645 | fast_tracepoint_collecting. */ | |
5646 | static collecting_t * ATTR_USED collecting; | |
5647 | ||
5648 | /* This routine, called from the jump pad (in asm) is designed to be | |
5649 | called from the jump pads of fast tracepoints, thus it is on the | |
5650 | critical path. */ | |
5651 | ||
5652 | IP_AGENT_EXPORT void ATTR_USED | |
5653 | gdb_collect (struct tracepoint *tpoint, unsigned char *regs) | |
5654 | { | |
5655 | struct fast_tracepoint_ctx ctx; | |
5656 | ||
5657 | /* Don't do anything until the trace run is completely set up. */ | |
5658 | if (!tracing) | |
5659 | return; | |
5660 | ||
5661 | ctx.base.type = fast_tracepoint; | |
5662 | ctx.regs = regs; | |
5663 | ctx.regcache_initted = 0; | |
fa593d66 PA |
5664 | /* Wrap the regblock in a register cache (in the stack, we don't |
5665 | want to malloc here). */ | |
5666 | ctx.regspace = alloca (register_cache_size ()); | |
5667 | if (ctx.regspace == NULL) | |
5668 | { | |
5669 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
5670 | return; | |
5671 | } | |
5672 | ||
a59306a3 YQ |
5673 | for (ctx.tpoint = tpoint; |
5674 | ctx.tpoint != NULL && ctx.tpoint->address == tpoint->address; | |
5675 | ctx.tpoint = ctx.tpoint->next) | |
fa593d66 | 5676 | { |
a59306a3 YQ |
5677 | if (!ctx.tpoint->enabled) |
5678 | continue; | |
fa593d66 | 5679 | |
a59306a3 YQ |
5680 | /* Multiple tracepoints of different types, such as fast tracepoint and |
5681 | static tracepoint, can be set at the same address. */ | |
5682 | if (ctx.tpoint->type != tpoint->type) | |
5683 | continue; | |
5684 | ||
5685 | /* Test the condition if present, and collect if true. */ | |
5686 | if (ctx.tpoint->cond == NULL | |
5687 | || condition_true_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
5688 | ctx.tpoint)) | |
5689 | { | |
5690 | collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
5691 | ctx.tpoint->address, ctx.tpoint); | |
5692 | ||
5693 | /* Note that this will cause original insns to be written back | |
5694 | to where we jumped from, but that's OK because we're jumping | |
5695 | back to the next whole instruction. This will go badly if | |
5696 | instruction restoration is not atomic though. */ | |
5697 | if (stopping_tracepoint | |
5698 | || trace_buffer_is_full | |
5699 | || expr_eval_result != expr_eval_no_error) | |
5700 | { | |
5701 | stop_tracing (); | |
5702 | break; | |
5703 | } | |
5704 | } | |
5705 | else | |
5706 | { | |
5707 | /* If there was a condition and it evaluated to false, the only | |
5708 | way we would stop tracing is if there was an error during | |
5709 | condition expression evaluation. */ | |
5710 | if (expr_eval_result != expr_eval_no_error) | |
5711 | { | |
5712 | stop_tracing (); | |
5713 | break; | |
5714 | } | |
5715 | } | |
fa593d66 PA |
5716 | } |
5717 | } | |
5718 | ||
5719 | #endif | |
5720 | ||
5721 | #ifndef IN_PROCESS_AGENT | |
5722 | ||
6a271cae PA |
5723 | CORE_ADDR |
5724 | get_raw_reg_func_addr (void) | |
5725 | { | |
5726 | return ipa_sym_addrs.addr_get_raw_reg; | |
5727 | } | |
5728 | ||
5e1dc496 LM |
5729 | CORE_ADDR |
5730 | get_get_tsv_func_addr (void) | |
6b9801d4 | 5731 | { |
5e1dc496 | 5732 | return ipa_sym_addrs.addr_get_trace_state_variable_value; |
6b9801d4 SS |
5733 | } |
5734 | ||
5e1dc496 LM |
5735 | CORE_ADDR |
5736 | get_set_tsv_func_addr (void) | |
6b9801d4 | 5737 | { |
5e1dc496 | 5738 | return ipa_sym_addrs.addr_set_trace_state_variable_value; |
6b9801d4 SS |
5739 | } |
5740 | ||
6a271cae | 5741 | static void |
493e2a69 MS |
5742 | compile_tracepoint_condition (struct tracepoint *tpoint, |
5743 | CORE_ADDR *jump_entry) | |
6a271cae PA |
5744 | { |
5745 | CORE_ADDR entry_point = *jump_entry; | |
5746 | enum eval_result_type err; | |
5747 | ||
5748 | trace_debug ("Starting condition compilation for tracepoint %d\n", | |
5749 | tpoint->number); | |
5750 | ||
5751 | /* Initialize the global pointer to the code being built. */ | |
5752 | current_insn_ptr = *jump_entry; | |
5753 | ||
5754 | emit_prologue (); | |
5755 | ||
5756 | err = compile_bytecodes (tpoint->cond); | |
5757 | ||
5758 | if (err == expr_eval_no_error) | |
5759 | { | |
5760 | emit_epilogue (); | |
5761 | ||
5762 | /* Record the beginning of the compiled code. */ | |
5763 | tpoint->compiled_cond = entry_point; | |
5764 | ||
5765 | trace_debug ("Condition compilation for tracepoint %d complete\n", | |
5766 | tpoint->number); | |
5767 | } | |
5768 | else | |
5769 | { | |
5770 | /* Leave the unfinished code in situ, but don't point to it. */ | |
5771 | ||
5772 | tpoint->compiled_cond = 0; | |
5773 | ||
5774 | trace_debug ("Condition compilation for tracepoint %d failed, " | |
5775 | "error code %d", | |
5776 | tpoint->number, err); | |
5777 | } | |
5778 | ||
5779 | /* Update the code pointer passed in. Note that we do this even if | |
5780 | the compile fails, so that we can look at the partial results | |
5781 | instead of letting them be overwritten. */ | |
5782 | *jump_entry = current_insn_ptr; | |
5783 | ||
5784 | /* Leave a gap, to aid dump decipherment. */ | |
5785 | *jump_entry += 16; | |
5786 | } | |
5787 | ||
fa593d66 PA |
5788 | /* We'll need to adjust these when we consider bi-arch setups, and big |
5789 | endian machines. */ | |
5790 | ||
5791 | static int | |
5792 | write_inferior_data_ptr (CORE_ADDR where, CORE_ADDR ptr) | |
5793 | { | |
5794 | return write_inferior_memory (where, | |
5795 | (unsigned char *) &ptr, sizeof (void *)); | |
5796 | } | |
5797 | ||
5798 | /* The base pointer of the IPA's heap. This is the only memory the | |
5799 | IPA is allowed to use. The IPA should _not_ call the inferior's | |
5800 | `malloc' during operation. That'd be slow, and, most importantly, | |
5801 | it may not be safe. We may be collecting a tracepoint in a signal | |
5802 | handler, for example. */ | |
5803 | static CORE_ADDR target_tp_heap; | |
5804 | ||
5805 | /* Allocate at least SIZE bytes of memory from the IPA heap, aligned | |
5806 | to 8 bytes. */ | |
5807 | ||
5808 | static CORE_ADDR | |
5809 | target_malloc (ULONGEST size) | |
5810 | { | |
5811 | CORE_ADDR ptr; | |
5812 | ||
5813 | if (target_tp_heap == 0) | |
5814 | { | |
5815 | /* We have the pointer *address*, need what it points to. */ | |
5816 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_tp_heap_buffer, | |
5817 | &target_tp_heap)) | |
5818 | fatal ("could get target heap head pointer"); | |
5819 | } | |
5820 | ||
5821 | ptr = target_tp_heap; | |
5822 | target_tp_heap += size; | |
5823 | ||
5824 | /* Pad to 8-byte alignment. */ | |
5825 | target_tp_heap = ((target_tp_heap + 7) & ~0x7); | |
5826 | ||
5827 | return ptr; | |
5828 | } | |
5829 | ||
5830 | static CORE_ADDR | |
5831 | download_agent_expr (struct agent_expr *expr) | |
5832 | { | |
5833 | CORE_ADDR expr_addr; | |
5834 | CORE_ADDR expr_bytes; | |
5835 | ||
5836 | expr_addr = target_malloc (sizeof (*expr)); | |
5837 | write_inferior_memory (expr_addr, (unsigned char *) expr, sizeof (*expr)); | |
5838 | ||
5839 | expr_bytes = target_malloc (expr->length); | |
5840 | write_inferior_data_ptr (expr_addr + offsetof (struct agent_expr, bytes), | |
5841 | expr_bytes); | |
5842 | write_inferior_memory (expr_bytes, expr->bytes, expr->length); | |
5843 | ||
5844 | return expr_addr; | |
5845 | } | |
5846 | ||
5847 | /* Align V up to N bits. */ | |
5848 | #define UALIGN(V, N) (((V) + ((N) - 1)) & ~((N) - 1)) | |
5849 | ||
5c73ff4e YQ |
5850 | /* Sync tracepoint with IPA, but leave maintenance of linked list to caller. */ |
5851 | ||
fa593d66 | 5852 | static void |
5c73ff4e | 5853 | download_tracepoint_1 (struct tracepoint *tpoint) |
fa593d66 | 5854 | { |
5c73ff4e YQ |
5855 | struct tracepoint target_tracepoint; |
5856 | CORE_ADDR tpptr = 0; | |
fa593d66 | 5857 | |
5c73ff4e YQ |
5858 | gdb_assert (tpoint->type == fast_tracepoint |
5859 | || tpoint->type == static_tracepoint); | |
fa593d66 | 5860 | |
5c73ff4e | 5861 | if (tpoint->cond != NULL && target_emit_ops () != NULL) |
fa593d66 | 5862 | { |
5c73ff4e | 5863 | CORE_ADDR jentry, jump_entry; |
fa593d66 | 5864 | |
5c73ff4e | 5865 | jentry = jump_entry = get_jump_space_head (); |
fa593d66 | 5866 | |
5c73ff4e | 5867 | if (tpoint->cond != NULL) |
6a271cae | 5868 | { |
5c73ff4e YQ |
5869 | /* Pad to 8-byte alignment. (needed?) */ |
5870 | /* Actually this should be left for the target to | |
5871 | decide. */ | |
5872 | jentry = UALIGN (jentry, 8); | |
5873 | ||
5874 | compile_tracepoint_condition (tpoint, &jentry); | |
5875 | } | |
5876 | ||
5877 | /* Pad to 8-byte alignment. */ | |
5878 | jentry = UALIGN (jentry, 8); | |
5879 | claim_jump_space (jentry - jump_entry); | |
5880 | } | |
6a271cae | 5881 | |
5c73ff4e | 5882 | target_tracepoint = *tpoint; |
6a271cae | 5883 | |
5c73ff4e YQ |
5884 | tpptr = target_malloc (sizeof (*tpoint)); |
5885 | tpoint->obj_addr_on_target = tpptr; | |
5886 | ||
5887 | /* Write the whole object. We'll fix up its pointers in a bit. | |
5888 | Assume no next for now. This is fixed up above on the next | |
5889 | iteration, if there's any. */ | |
5890 | target_tracepoint.next = NULL; | |
5891 | /* Need to clear this here too, since we're downloading the | |
5892 | tracepoints before clearing our own copy. */ | |
5893 | target_tracepoint.hit_count = 0; | |
5894 | ||
5895 | write_inferior_memory (tpptr, (unsigned char *) &target_tracepoint, | |
5896 | sizeof (target_tracepoint)); | |
5897 | ||
5898 | if (tpoint->cond) | |
5899 | write_inferior_data_ptr (tpptr + offsetof (struct tracepoint, | |
5900 | cond), | |
5901 | download_agent_expr (tpoint->cond)); | |
5902 | ||
5903 | if (tpoint->numactions) | |
5904 | { | |
5905 | int i; | |
5906 | CORE_ADDR actions_array; | |
5907 | ||
5908 | /* The pointers array. */ | |
5909 | actions_array | |
5910 | = target_malloc (sizeof (*tpoint->actions) * tpoint->numactions); | |
5911 | write_inferior_data_ptr (tpptr + offsetof (struct tracepoint, | |
5912 | actions), | |
5913 | actions_array); | |
5914 | ||
5915 | /* Now for each pointer, download the action. */ | |
5916 | for (i = 0; i < tpoint->numactions; i++) | |
5917 | { | |
5c73ff4e | 5918 | struct tracepoint_action *action = tpoint->actions[i]; |
8d0d92cd | 5919 | CORE_ADDR ipa_action = action->ops->download (action); |
6a271cae | 5920 | |
5c73ff4e YQ |
5921 | if (ipa_action != 0) |
5922 | write_inferior_data_ptr | |
5923 | (actions_array + i * sizeof (sizeof (*tpoint->actions)), | |
5924 | ipa_action); | |
6a271cae | 5925 | } |
5c73ff4e YQ |
5926 | } |
5927 | } | |
6a271cae | 5928 | |
42476b70 YQ |
5929 | #define IPA_PROTO_FAST_TRACE_FLAG 0 |
5930 | #define IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET 2 | |
5931 | #define IPA_PROTO_FAST_TRACE_JUMP_PAD 10 | |
5932 | #define IPA_PROTO_FAST_TRACE_FJUMP_SIZE 18 | |
5933 | #define IPA_PROTO_FAST_TRACE_FJUMP_INSN 22 | |
5934 | ||
5935 | /* Send a command to agent to download and install tracepoint TPOINT. */ | |
5936 | ||
5937 | static int | |
5938 | tracepoint_send_agent (struct tracepoint *tpoint) | |
5939 | { | |
5940 | char buf[IPA_CMD_BUF_SIZE]; | |
5941 | char *p; | |
5942 | int i, ret; | |
5943 | ||
5944 | p = buf; | |
5945 | strcpy (p, "FastTrace:"); | |
5946 | p += 10; | |
5947 | ||
5948 | COPY_FIELD_TO_BUF (p, tpoint, number); | |
5949 | COPY_FIELD_TO_BUF (p, tpoint, address); | |
5950 | COPY_FIELD_TO_BUF (p, tpoint, type); | |
5951 | COPY_FIELD_TO_BUF (p, tpoint, enabled); | |
5952 | COPY_FIELD_TO_BUF (p, tpoint, step_count); | |
5953 | COPY_FIELD_TO_BUF (p, tpoint, pass_count); | |
5954 | COPY_FIELD_TO_BUF (p, tpoint, numactions); | |
5955 | COPY_FIELD_TO_BUF (p, tpoint, hit_count); | |
5956 | COPY_FIELD_TO_BUF (p, tpoint, traceframe_usage); | |
5957 | COPY_FIELD_TO_BUF (p, tpoint, compiled_cond); | |
5958 | COPY_FIELD_TO_BUF (p, tpoint, orig_size); | |
5959 | ||
5960 | /* condition */ | |
5961 | p = agent_expr_send (p, tpoint->cond); | |
5962 | ||
5963 | /* tracepoint_action */ | |
5964 | for (i = 0; i < tpoint->numactions; i++) | |
5965 | { | |
5966 | struct tracepoint_action *action = tpoint->actions[i]; | |
5967 | ||
5968 | p[0] = action->type; | |
5969 | p = action->ops->send (&p[1], action); | |
5970 | } | |
5971 | ||
5972 | get_jump_space_head (); | |
5973 | /* Copy the value of GDB_JUMP_PAD_HEAD to command buffer, so that | |
5974 | agent can use jump pad from it. */ | |
5975 | if (tpoint->type == fast_tracepoint) | |
5976 | { | |
5977 | memcpy (p, &gdb_jump_pad_head, 8); | |
5978 | p += 8; | |
5979 | } | |
5980 | ||
5981 | ret = run_inferior_command (buf, (int) (ptrdiff_t) (p - buf)); | |
5982 | if (ret) | |
5983 | return ret; | |
5984 | ||
5985 | if (strncmp (buf, "OK", 2) != 0) | |
5986 | return 1; | |
5987 | ||
5988 | /* The value of tracepoint's target address is stored in BUF. */ | |
5989 | memcpy (&tpoint->obj_addr_on_target, | |
5990 | &buf[IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET], 8); | |
5991 | ||
5992 | if (tpoint->type == fast_tracepoint) | |
5993 | { | |
5994 | unsigned char *insn | |
5995 | = (unsigned char *) &buf[IPA_PROTO_FAST_TRACE_FJUMP_INSN]; | |
5996 | int fjump_size; | |
5997 | ||
5998 | trace_debug ("agent: read from cmd_buf 0x%x 0x%x\n", | |
5999 | (unsigned int) tpoint->obj_addr_on_target, | |
6000 | (unsigned int) gdb_jump_pad_head); | |
6001 | ||
6002 | memcpy (&gdb_jump_pad_head, &buf[IPA_PROTO_FAST_TRACE_JUMP_PAD], 8); | |
6003 | ||
6004 | /* This has been done in agent. We should also set up record for it. */ | |
6005 | memcpy (&fjump_size, &buf[IPA_PROTO_FAST_TRACE_FJUMP_SIZE], 4); | |
6006 | /* Wire it in. */ | |
6007 | tpoint->handle | |
6008 | = set_fast_tracepoint_jump (tpoint->address, insn, fjump_size); | |
6009 | } | |
6010 | ||
6011 | return 0; | |
6012 | } | |
6013 | ||
1e4d1764 YQ |
6014 | static void |
6015 | download_tracepoint (struct tracepoint *tpoint) | |
6016 | { | |
6017 | struct tracepoint *tp, *tp_prev; | |
6018 | ||
6019 | if (tpoint->type != fast_tracepoint | |
6020 | && tpoint->type != static_tracepoint) | |
6021 | return; | |
6022 | ||
6023 | download_tracepoint_1 (tpoint); | |
6024 | ||
6025 | /* Find the previous entry of TPOINT, which is fast tracepoint or | |
6026 | static tracepoint. */ | |
6027 | tp_prev = NULL; | |
6028 | for (tp = tracepoints; tp != tpoint; tp = tp->next) | |
6029 | { | |
6030 | if (tp->type == fast_tracepoint || tp->type == static_tracepoint) | |
6031 | tp_prev = tp; | |
6032 | } | |
6033 | ||
6034 | if (tp_prev) | |
6035 | { | |
6036 | CORE_ADDR tp_prev_target_next_addr; | |
6037 | ||
6038 | /* Insert TPOINT after TP_PREV in IPA. */ | |
6039 | if (read_inferior_data_pointer (tp_prev->obj_addr_on_target | |
6040 | + offsetof (struct tracepoint, next), | |
6041 | &tp_prev_target_next_addr)) | |
6042 | fatal ("error reading `tp_prev->next'"); | |
6043 | ||
6044 | /* tpoint->next = tp_prev->next */ | |
6045 | write_inferior_data_ptr (tpoint->obj_addr_on_target | |
6046 | + offsetof (struct tracepoint, next), | |
6047 | tp_prev_target_next_addr); | |
6048 | /* tp_prev->next = tpoint */ | |
6049 | write_inferior_data_ptr (tp_prev->obj_addr_on_target | |
6050 | + offsetof (struct tracepoint, next), | |
6051 | tpoint->obj_addr_on_target); | |
6052 | } | |
6053 | else | |
6054 | /* First object in list, set the head pointer in the | |
6055 | inferior. */ | |
6056 | write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints, | |
6057 | tpoint->obj_addr_on_target); | |
6058 | ||
6059 | } | |
6060 | ||
fa593d66 PA |
6061 | static void |
6062 | download_trace_state_variables (void) | |
6063 | { | |
6064 | CORE_ADDR ptr = 0, prev_ptr = 0; | |
6065 | struct trace_state_variable *tsv; | |
6066 | ||
6067 | /* Start out empty. */ | |
6068 | write_inferior_data_ptr (ipa_sym_addrs.addr_trace_state_variables, 0); | |
6069 | ||
6070 | for (tsv = trace_state_variables; tsv != NULL; tsv = tsv->next) | |
6071 | { | |
6072 | struct trace_state_variable target_tsv; | |
6073 | ||
6074 | /* TSV's with a getter have been initialized equally in both the | |
6075 | inferior and GDBserver. Skip them. */ | |
6076 | if (tsv->getter != NULL) | |
6077 | continue; | |
6078 | ||
6079 | target_tsv = *tsv; | |
6080 | ||
6081 | prev_ptr = ptr; | |
6082 | ptr = target_malloc (sizeof (*tsv)); | |
6083 | ||
6084 | if (tsv == trace_state_variables) | |
6085 | { | |
6086 | /* First object in list, set the head pointer in the | |
6087 | inferior. */ | |
6088 | ||
6089 | write_inferior_data_ptr (ipa_sym_addrs.addr_trace_state_variables, | |
6090 | ptr); | |
6091 | } | |
6092 | else | |
6093 | { | |
6094 | write_inferior_data_ptr (prev_ptr | |
6095 | + offsetof (struct trace_state_variable, | |
6096 | next), | |
6097 | ptr); | |
6098 | } | |
6099 | ||
6100 | /* Write the whole object. We'll fix up its pointers in a bit. | |
6101 | Assume no next, fixup when needed. */ | |
6102 | target_tsv.next = NULL; | |
6103 | ||
6104 | write_inferior_memory (ptr, (unsigned char *) &target_tsv, | |
6105 | sizeof (target_tsv)); | |
6106 | ||
6107 | if (tsv->name != NULL) | |
6108 | { | |
6109 | size_t size = strlen (tsv->name) + 1; | |
6110 | CORE_ADDR name_addr = target_malloc (size); | |
6111 | write_inferior_memory (name_addr, | |
6112 | (unsigned char *) tsv->name, size); | |
6113 | write_inferior_data_ptr (ptr | |
6114 | + offsetof (struct trace_state_variable, | |
6115 | name), | |
6116 | name_addr); | |
6117 | } | |
6118 | ||
6119 | if (tsv->getter != NULL) | |
6120 | { | |
6121 | fatal ("what to do with these?"); | |
6122 | } | |
6123 | } | |
6124 | ||
6125 | if (prev_ptr != 0) | |
6126 | { | |
6127 | /* Fixup the next pointer in the last item in the list. */ | |
493e2a69 MS |
6128 | write_inferior_data_ptr (prev_ptr |
6129 | + offsetof (struct trace_state_variable, | |
6130 | next), 0); | |
fa593d66 PA |
6131 | } |
6132 | } | |
6133 | ||
6134 | /* Upload complete trace frames out of the IP Agent's trace buffer | |
6135 | into GDBserver's trace buffer. This always uploads either all or | |
6136 | no trace frames. This is the counter part of | |
6137 | `trace_alloc_trace_buffer'. See its description of the atomic | |
6138 | synching mechanism. */ | |
6139 | ||
6140 | static void | |
6141 | upload_fast_traceframes (void) | |
6142 | { | |
6143 | unsigned int ipa_traceframe_read_count, ipa_traceframe_write_count; | |
6144 | unsigned int ipa_traceframe_read_count_racy, ipa_traceframe_write_count_racy; | |
6145 | CORE_ADDR tf; | |
6146 | struct ipa_trace_buffer_control ipa_trace_buffer_ctrl; | |
6147 | unsigned int curr_tbctrl_idx; | |
6148 | unsigned int ipa_trace_buffer_ctrl_curr; | |
6149 | unsigned int ipa_trace_buffer_ctrl_curr_old; | |
6150 | CORE_ADDR ipa_trace_buffer_ctrl_addr; | |
6151 | struct breakpoint *about_to_request_buffer_space_bkpt; | |
6152 | CORE_ADDR ipa_trace_buffer_lo; | |
6153 | CORE_ADDR ipa_trace_buffer_hi; | |
6154 | ||
6155 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, | |
6156 | &ipa_traceframe_read_count_racy)) | |
6157 | { | |
6158 | /* This will happen in most targets if the current thread is | |
6159 | running. */ | |
6160 | return; | |
6161 | } | |
6162 | ||
6163 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, | |
6164 | &ipa_traceframe_write_count_racy)) | |
6165 | return; | |
6166 | ||
6167 | trace_debug ("ipa_traceframe_count (racy area): %d (w=%d, r=%d)", | |
493e2a69 MS |
6168 | ipa_traceframe_write_count_racy |
6169 | - ipa_traceframe_read_count_racy, | |
6170 | ipa_traceframe_write_count_racy, | |
6171 | ipa_traceframe_read_count_racy); | |
fa593d66 PA |
6172 | |
6173 | if (ipa_traceframe_write_count_racy == ipa_traceframe_read_count_racy) | |
6174 | return; | |
6175 | ||
6176 | about_to_request_buffer_space_bkpt | |
6177 | = set_breakpoint_at (ipa_sym_addrs.addr_about_to_request_buffer_space, | |
6178 | NULL); | |
6179 | ||
6180 | if (read_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, | |
6181 | &ipa_trace_buffer_ctrl_curr)) | |
6182 | return; | |
6183 | ||
6184 | ipa_trace_buffer_ctrl_curr_old = ipa_trace_buffer_ctrl_curr; | |
6185 | ||
6186 | curr_tbctrl_idx = ipa_trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK; | |
6187 | ||
6188 | { | |
6189 | unsigned int prev, counter; | |
6190 | ||
6191 | /* Update the token, with new counters, and the GDBserver stamp | |
6192 | bit. Alway reuse the current TBC index. */ | |
2ece8244 YQ |
6193 | prev = ipa_trace_buffer_ctrl_curr & GDBSERVER_FLUSH_COUNT_MASK_CURR; |
6194 | counter = (prev + 0x100) & GDBSERVER_FLUSH_COUNT_MASK_CURR; | |
fa593d66 | 6195 | |
2ece8244 | 6196 | ipa_trace_buffer_ctrl_curr = (GDBSERVER_UPDATED_FLUSH_COUNT_BIT |
fa593d66 PA |
6197 | | (prev << 12) |
6198 | | counter | |
6199 | | curr_tbctrl_idx); | |
6200 | } | |
6201 | ||
6202 | if (write_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, | |
6203 | ipa_trace_buffer_ctrl_curr)) | |
6204 | return; | |
6205 | ||
6206 | trace_debug ("Lib: Committed %08x -> %08x", | |
6207 | ipa_trace_buffer_ctrl_curr_old, | |
6208 | ipa_trace_buffer_ctrl_curr); | |
6209 | ||
6210 | /* Re-read these, now that we've installed the | |
6211 | `about_to_request_buffer_space' breakpoint/lock. A thread could | |
6212 | have finished a traceframe between the last read of these | |
6213 | counters and setting the breakpoint above. If we start | |
6214 | uploading, we never want to leave this function with | |
6215 | traceframe_read_count != 0, otherwise, GDBserver could end up | |
6216 | incrementing the counter tokens more than once (due to event loop | |
6217 | nesting), which would break the IP agent's "effective" detection | |
6218 | (see trace_alloc_trace_buffer). */ | |
6219 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, | |
6220 | &ipa_traceframe_read_count)) | |
6221 | return; | |
6222 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, | |
6223 | &ipa_traceframe_write_count)) | |
6224 | return; | |
6225 | ||
6226 | if (debug_threads) | |
6227 | { | |
6228 | trace_debug ("ipa_traceframe_count (blocked area): %d (w=%d, r=%d)", | |
6229 | ipa_traceframe_write_count - ipa_traceframe_read_count, | |
6230 | ipa_traceframe_write_count, ipa_traceframe_read_count); | |
6231 | ||
6232 | if (ipa_traceframe_write_count != ipa_traceframe_write_count_racy | |
6233 | || ipa_traceframe_read_count != ipa_traceframe_read_count_racy) | |
6234 | trace_debug ("note that ipa_traceframe_count's parts changed"); | |
6235 | } | |
6236 | ||
6237 | /* Get the address of the current TBC object (the IP agent has an | |
6238 | array of 3 such objects). The index is stored in the TBC | |
6239 | token. */ | |
6240 | ipa_trace_buffer_ctrl_addr = ipa_sym_addrs.addr_trace_buffer_ctrl; | |
6241 | ipa_trace_buffer_ctrl_addr | |
6242 | += sizeof (struct ipa_trace_buffer_control) * curr_tbctrl_idx; | |
6243 | ||
6244 | if (read_inferior_memory (ipa_trace_buffer_ctrl_addr, | |
6245 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
6246 | sizeof (struct ipa_trace_buffer_control))) | |
6247 | return; | |
6248 | ||
6249 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_lo, | |
6250 | &ipa_trace_buffer_lo)) | |
6251 | return; | |
6252 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_hi, | |
6253 | &ipa_trace_buffer_hi)) | |
6254 | return; | |
6255 | ||
6256 | /* Offsets are easier to grok for debugging than raw addresses, | |
6257 | especially for the small trace buffer sizes that are useful for | |
6258 | testing. */ | |
6259 | trace_debug ("Lib: Trace buffer [%d] start=%d free=%d " | |
6260 | "endfree=%d wrap=%d hi=%d", | |
6261 | curr_tbctrl_idx, | |
6262 | (int) (ipa_trace_buffer_ctrl.start - ipa_trace_buffer_lo), | |
6263 | (int) (ipa_trace_buffer_ctrl.free - ipa_trace_buffer_lo), | |
6264 | (int) (ipa_trace_buffer_ctrl.end_free - ipa_trace_buffer_lo), | |
6265 | (int) (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo), | |
6266 | (int) (ipa_trace_buffer_hi - ipa_trace_buffer_lo)); | |
6267 | ||
6268 | /* Note that the IPA's buffer is always circular. */ | |
6269 | ||
6270 | #define IPA_FIRST_TRACEFRAME() (ipa_trace_buffer_ctrl.start) | |
6271 | ||
6272 | #define IPA_NEXT_TRACEFRAME_1(TF, TFOBJ) \ | |
6273 | ((TF) + sizeof (struct traceframe) + (TFOBJ)->data_size) | |
6274 | ||
6275 | #define IPA_NEXT_TRACEFRAME(TF, TFOBJ) \ | |
6276 | (IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) \ | |
6277 | - ((IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) >= ipa_trace_buffer_ctrl.wrap) \ | |
6278 | ? (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo) \ | |
6279 | : 0)) | |
6280 | ||
6281 | tf = IPA_FIRST_TRACEFRAME (); | |
6282 | ||
6283 | while (ipa_traceframe_write_count - ipa_traceframe_read_count) | |
6284 | { | |
6285 | struct tracepoint *tpoint; | |
6286 | struct traceframe *tframe; | |
6287 | unsigned char *block; | |
6288 | struct traceframe ipa_tframe; | |
6289 | ||
6290 | if (read_inferior_memory (tf, (unsigned char *) &ipa_tframe, | |
6291 | offsetof (struct traceframe, data))) | |
6292 | error ("Uploading: couldn't read traceframe at %s\n", paddress (tf)); | |
6293 | ||
6294 | if (ipa_tframe.tpnum == 0) | |
6295 | fatal ("Uploading: No (more) fast traceframes, but " | |
6296 | "ipa_traceframe_count == %u??\n", | |
6297 | ipa_traceframe_write_count - ipa_traceframe_read_count); | |
6298 | ||
6299 | /* Note that this will be incorrect for multi-location | |
6300 | tracepoints... */ | |
6301 | tpoint = find_next_tracepoint_by_number (NULL, ipa_tframe.tpnum); | |
6302 | ||
6303 | tframe = add_traceframe (tpoint); | |
6304 | if (tframe == NULL) | |
6305 | { | |
6306 | trace_buffer_is_full = 1; | |
6307 | trace_debug ("Uploading: trace buffer is full"); | |
6308 | } | |
6309 | else | |
6310 | { | |
6311 | /* Copy the whole set of blocks in one go for now. FIXME: | |
6312 | split this in smaller blocks. */ | |
6313 | block = add_traceframe_block (tframe, ipa_tframe.data_size); | |
6314 | if (block != NULL) | |
6315 | { | |
493e2a69 MS |
6316 | if (read_inferior_memory (tf |
6317 | + offsetof (struct traceframe, data), | |
fa593d66 PA |
6318 | block, ipa_tframe.data_size)) |
6319 | error ("Uploading: Couldn't read traceframe data at %s\n", | |
6320 | paddress (tf + offsetof (struct traceframe, data))); | |
6321 | } | |
6322 | ||
6323 | trace_debug ("Uploading: traceframe didn't fit"); | |
6324 | finish_traceframe (tframe); | |
6325 | } | |
6326 | ||
6327 | tf = IPA_NEXT_TRACEFRAME (tf, &ipa_tframe); | |
6328 | ||
6329 | /* If we freed the traceframe that wrapped around, go back | |
6330 | to the non-wrap case. */ | |
6331 | if (tf < ipa_trace_buffer_ctrl.start) | |
6332 | { | |
6333 | trace_debug ("Lib: Discarding past the wraparound"); | |
6334 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
6335 | } | |
6336 | ipa_trace_buffer_ctrl.start = tf; | |
6337 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_ctrl.start; | |
6338 | ++ipa_traceframe_read_count; | |
6339 | ||
6340 | if (ipa_trace_buffer_ctrl.start == ipa_trace_buffer_ctrl.free | |
6341 | && ipa_trace_buffer_ctrl.start == ipa_trace_buffer_ctrl.end_free) | |
6342 | { | |
6343 | trace_debug ("Lib: buffer is fully empty. " | |
6344 | "Trace buffer [%d] start=%d free=%d endfree=%d", | |
6345 | curr_tbctrl_idx, | |
6346 | (int) (ipa_trace_buffer_ctrl.start | |
6347 | - ipa_trace_buffer_lo), | |
6348 | (int) (ipa_trace_buffer_ctrl.free | |
6349 | - ipa_trace_buffer_lo), | |
6350 | (int) (ipa_trace_buffer_ctrl.end_free | |
6351 | - ipa_trace_buffer_lo)); | |
6352 | ||
6353 | ipa_trace_buffer_ctrl.start = ipa_trace_buffer_lo; | |
6354 | ipa_trace_buffer_ctrl.free = ipa_trace_buffer_lo; | |
6355 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_hi; | |
6356 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
6357 | } | |
6358 | ||
6359 | trace_debug ("Uploaded a traceframe\n" | |
6360 | "Lib: Trace buffer [%d] start=%d free=%d " | |
6361 | "endfree=%d wrap=%d hi=%d", | |
6362 | curr_tbctrl_idx, | |
6363 | (int) (ipa_trace_buffer_ctrl.start - ipa_trace_buffer_lo), | |
6364 | (int) (ipa_trace_buffer_ctrl.free - ipa_trace_buffer_lo), | |
493e2a69 MS |
6365 | (int) (ipa_trace_buffer_ctrl.end_free |
6366 | - ipa_trace_buffer_lo), | |
fa593d66 PA |
6367 | (int) (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo), |
6368 | (int) (ipa_trace_buffer_hi - ipa_trace_buffer_lo)); | |
6369 | } | |
6370 | ||
6371 | if (write_inferior_memory (ipa_trace_buffer_ctrl_addr, | |
6372 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
6373 | sizeof (struct ipa_trace_buffer_control))) | |
6374 | return; | |
6375 | ||
6376 | write_inferior_integer (ipa_sym_addrs.addr_traceframe_read_count, | |
6377 | ipa_traceframe_read_count); | |
6378 | ||
6379 | trace_debug ("Done uploading traceframes [%d]\n", curr_tbctrl_idx); | |
6380 | ||
6381 | pause_all (1); | |
6382 | cancel_breakpoints (); | |
6383 | ||
6384 | delete_breakpoint (about_to_request_buffer_space_bkpt); | |
6385 | about_to_request_buffer_space_bkpt = NULL; | |
6386 | ||
6387 | unpause_all (1); | |
6388 | ||
6389 | if (trace_buffer_is_full) | |
6390 | stop_tracing (); | |
6391 | } | |
6392 | #endif | |
6393 | ||
6394 | #ifdef IN_PROCESS_AGENT | |
6395 | ||
0fb4aa4b | 6396 | IP_AGENT_EXPORT int ust_loaded; |
2fa291ac | 6397 | IP_AGENT_EXPORT char cmd_buf[IPA_CMD_BUF_SIZE]; |
fa593d66 | 6398 | |
0fb4aa4b | 6399 | #ifdef HAVE_UST |
fa593d66 | 6400 | |
0fb4aa4b PA |
6401 | /* Static tracepoints. */ |
6402 | ||
6403 | /* UST puts a "struct tracepoint" in the global namespace, which | |
6404 | conflicts with our tracepoint. Arguably, being a library, it | |
6405 | shouldn't take ownership of such a generic name. We work around it | |
6406 | here. */ | |
6407 | #define tracepoint ust_tracepoint | |
6408 | #include <ust/ust.h> | |
6409 | #undef tracepoint | |
6410 | ||
6411 | extern int serialize_to_text (char *outbuf, int bufsize, | |
6412 | const char *fmt, va_list ap); | |
6413 | ||
6414 | #define GDB_PROBE_NAME "gdb" | |
6415 | ||
6416 | /* We dynamically search for the UST symbols instead of linking them | |
6417 | in. This lets the user decide if the application uses static | |
6418 | tracepoints, instead of always pulling libust.so in. This vector | |
6419 | holds pointers to all functions we care about. */ | |
6420 | ||
6421 | static struct | |
fa593d66 | 6422 | { |
0fb4aa4b PA |
6423 | int (*serialize_to_text) (char *outbuf, int bufsize, |
6424 | const char *fmt, va_list ap); | |
6425 | ||
6426 | int (*ltt_probe_register) (struct ltt_available_probe *pdata); | |
6427 | int (*ltt_probe_unregister) (struct ltt_available_probe *pdata); | |
6428 | ||
6429 | int (*ltt_marker_connect) (const char *channel, const char *mname, | |
6430 | const char *pname); | |
6431 | int (*ltt_marker_disconnect) (const char *channel, const char *mname, | |
6432 | const char *pname); | |
6433 | ||
6434 | void (*marker_iter_start) (struct marker_iter *iter); | |
6435 | void (*marker_iter_next) (struct marker_iter *iter); | |
6436 | void (*marker_iter_stop) (struct marker_iter *iter); | |
6437 | void (*marker_iter_reset) (struct marker_iter *iter); | |
6438 | } ust_ops; | |
6439 | ||
6440 | #include <dlfcn.h> | |
6441 | ||
6442 | /* Cast through typeof to catch incompatible API changes. Since UST | |
6443 | only builds with gcc, we can freely use gcc extensions here | |
6444 | too. */ | |
6445 | #define GET_UST_SYM(SYM) \ | |
6446 | do \ | |
6447 | { \ | |
6448 | if (ust_ops.SYM == NULL) \ | |
6449 | ust_ops.SYM = (typeof (&SYM)) dlsym (RTLD_DEFAULT, #SYM); \ | |
6450 | if (ust_ops.SYM == NULL) \ | |
6451 | return 0; \ | |
6452 | } while (0) | |
6453 | ||
6454 | #define USTF(SYM) ust_ops.SYM | |
6455 | ||
6456 | /* Get pointers to all libust.so functions we care about. */ | |
6457 | ||
6458 | static int | |
6459 | dlsym_ust (void) | |
6460 | { | |
6461 | GET_UST_SYM (serialize_to_text); | |
6462 | ||
6463 | GET_UST_SYM (ltt_probe_register); | |
6464 | GET_UST_SYM (ltt_probe_unregister); | |
6465 | GET_UST_SYM (ltt_marker_connect); | |
6466 | GET_UST_SYM (ltt_marker_disconnect); | |
6467 | ||
6468 | GET_UST_SYM (marker_iter_start); | |
6469 | GET_UST_SYM (marker_iter_next); | |
6470 | GET_UST_SYM (marker_iter_stop); | |
6471 | GET_UST_SYM (marker_iter_reset); | |
6472 | ||
6473 | ust_loaded = 1; | |
6474 | return 1; | |
fa593d66 PA |
6475 | } |
6476 | ||
0fb4aa4b PA |
6477 | /* Given an UST marker, return the matching gdb static tracepoint. |
6478 | The match is done by address. */ | |
6479 | ||
6480 | static struct tracepoint * | |
6481 | ust_marker_to_static_tracepoint (const struct marker *mdata) | |
6482 | { | |
6483 | struct tracepoint *tpoint; | |
6484 | ||
6485 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
6486 | { | |
d248b706 | 6487 | if (tpoint->type != static_tracepoint) |
0fb4aa4b PA |
6488 | continue; |
6489 | ||
6490 | if (tpoint->address == (uintptr_t) mdata->location) | |
6491 | return tpoint; | |
6492 | } | |
6493 | ||
6494 | return NULL; | |
6495 | } | |
6496 | ||
6497 | /* The probe function we install on lttng/ust markers. Whenever a | |
6498 | probed ust marker is hit, this function is called. This is similar | |
6499 | to gdb_collect, only for static tracepoints, instead of fast | |
6500 | tracepoints. */ | |
6501 | ||
6502 | static void | |
6503 | gdb_probe (const struct marker *mdata, void *probe_private, | |
6504 | struct registers *regs, void *call_private, | |
6505 | const char *fmt, va_list *args) | |
6506 | { | |
6507 | struct tracepoint *tpoint; | |
6508 | struct static_tracepoint_ctx ctx; | |
6509 | ||
6510 | /* Don't do anything until the trace run is completely set up. */ | |
6511 | if (!tracing) | |
6512 | { | |
6513 | trace_debug ("gdb_probe: not tracing\n"); | |
6514 | return; | |
6515 | } | |
6516 | ||
6517 | ctx.base.type = static_tracepoint; | |
6518 | ctx.regcache_initted = 0; | |
6519 | ctx.regs = regs; | |
6520 | ctx.fmt = fmt; | |
6521 | ctx.args = args; | |
6522 | ||
6523 | /* Wrap the regblock in a register cache (in the stack, we don't | |
6524 | want to malloc here). */ | |
6525 | ctx.regspace = alloca (register_cache_size ()); | |
6526 | if (ctx.regspace == NULL) | |
6527 | { | |
6528 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
6529 | return; | |
6530 | } | |
6531 | ||
6532 | tpoint = ust_marker_to_static_tracepoint (mdata); | |
6533 | if (tpoint == NULL) | |
6534 | { | |
6535 | trace_debug ("gdb_probe: marker not known: " | |
6536 | "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"", | |
6537 | mdata->location, mdata->channel, | |
6538 | mdata->name, mdata->format); | |
6539 | return; | |
6540 | } | |
6541 | ||
d248b706 KY |
6542 | if (!tpoint->enabled) |
6543 | { | |
6544 | trace_debug ("gdb_probe: tracepoint disabled"); | |
6545 | return; | |
6546 | } | |
6547 | ||
0fb4aa4b PA |
6548 | ctx.tpoint = tpoint; |
6549 | ||
6550 | trace_debug ("gdb_probe: collecting marker: " | |
6551 | "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"", | |
6552 | mdata->location, mdata->channel, | |
6553 | mdata->name, mdata->format); | |
6554 | ||
6555 | /* Test the condition if present, and collect if true. */ | |
6556 | if (tpoint->cond == NULL | |
6557 | || condition_true_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
6558 | tpoint)) | |
6559 | { | |
6560 | collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
6561 | tpoint->address, tpoint); | |
6562 | ||
6563 | if (stopping_tracepoint | |
6564 | || trace_buffer_is_full | |
6565 | || expr_eval_result != expr_eval_no_error) | |
6566 | stop_tracing (); | |
6567 | } | |
6568 | else | |
6569 | { | |
6570 | /* If there was a condition and it evaluated to false, the only | |
6571 | way we would stop tracing is if there was an error during | |
6572 | condition expression evaluation. */ | |
6573 | if (expr_eval_result != expr_eval_no_error) | |
6574 | stop_tracing (); | |
6575 | } | |
6576 | } | |
6577 | ||
6578 | /* Called if the gdb static tracepoint requested collecting "$_sdata", | |
6579 | static tracepoint string data. This is a string passed to the | |
6580 | tracing library by the user, at the time of the tracepoint marker | |
6581 | call. E.g., in the UST marker call: | |
6582 | ||
6583 | trace_mark (ust, bar33, "str %s", "FOOBAZ"); | |
6584 | ||
6585 | the collected data is "str FOOBAZ". | |
6586 | */ | |
6587 | ||
6588 | static void | |
6589 | collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
0fb4aa4b PA |
6590 | struct traceframe *tframe) |
6591 | { | |
6592 | struct static_tracepoint_ctx *umd = (struct static_tracepoint_ctx *) ctx; | |
6593 | unsigned char *bufspace; | |
6594 | int size; | |
6595 | va_list copy; | |
6596 | unsigned short blocklen; | |
6597 | ||
6598 | if (umd == NULL) | |
6599 | { | |
6600 | trace_debug ("Wanted to collect static trace data, " | |
6601 | "but there's no static trace data"); | |
6602 | return; | |
6603 | } | |
6604 | ||
6605 | va_copy (copy, *umd->args); | |
6606 | size = USTF(serialize_to_text) (NULL, 0, umd->fmt, copy); | |
6607 | va_end (copy); | |
6608 | ||
6609 | trace_debug ("Want to collect ust data"); | |
6610 | ||
6611 | /* 'S' + size + string */ | |
6612 | bufspace = add_traceframe_block (tframe, | |
6613 | 1 + sizeof (blocklen) + size + 1); | |
6614 | if (bufspace == NULL) | |
6615 | { | |
6616 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
6617 | return; | |
6618 | } | |
6619 | ||
6620 | /* Identify a static trace data block. */ | |
6621 | *bufspace = 'S'; | |
6622 | ||
6623 | blocklen = size + 1; | |
6624 | memcpy (bufspace + 1, &blocklen, sizeof (blocklen)); | |
6625 | ||
6626 | va_copy (copy, *umd->args); | |
6627 | USTF(serialize_to_text) ((char *) bufspace + 1 + sizeof (blocklen), | |
6628 | size + 1, umd->fmt, copy); | |
6629 | va_end (copy); | |
6630 | ||
6631 | trace_debug ("Storing static tracepoint data in regblock: %s", | |
6632 | bufspace + 1 + sizeof (blocklen)); | |
6633 | } | |
6634 | ||
6635 | /* The probe to register with lttng/ust. */ | |
6636 | static struct ltt_available_probe gdb_ust_probe = | |
6637 | { | |
6638 | GDB_PROBE_NAME, | |
6639 | NULL, | |
6640 | gdb_probe, | |
6641 | }; | |
6642 | ||
6643 | #endif /* HAVE_UST */ | |
6644 | #endif /* IN_PROCESS_AGENT */ | |
6645 | ||
0fb4aa4b PA |
6646 | #ifndef IN_PROCESS_AGENT |
6647 | ||
0fb4aa4b PA |
6648 | /* Ask the in-process agent to run a command. Since we don't want to |
6649 | have to handle the IPA hitting breakpoints while running the | |
6650 | command, we pause all threads, remove all breakpoints, and then set | |
6651 | the helper thread re-running. We communicate with the helper | |
6652 | thread by means of direct memory xfering, and a socket for | |
6653 | synchronization. */ | |
6654 | ||
6655 | static int | |
42476b70 | 6656 | run_inferior_command (char *cmd, int len) |
0fb4aa4b PA |
6657 | { |
6658 | int err = -1; | |
0fb4aa4b | 6659 | int pid = ptid_get_pid (current_inferior->entry.id); |
0fb4aa4b PA |
6660 | |
6661 | trace_debug ("run_inferior_command: running: %s", cmd); | |
6662 | ||
6663 | pause_all (0); | |
6664 | uninsert_all_breakpoints (); | |
6665 | ||
42476b70 | 6666 | err = agent_run_command (pid, (const char *) cmd, len); |
0fb4aa4b PA |
6667 | |
6668 | reinsert_all_breakpoints (); | |
6669 | unpause_all (0); | |
6670 | ||
6671 | return err; | |
6672 | } | |
6673 | ||
2fa291ac | 6674 | #else /* !IN_PROCESS_AGENT */ |
0fb4aa4b | 6675 | |
2fa291ac YQ |
6676 | #include <sys/socket.h> |
6677 | #include <sys/un.h> | |
0fb4aa4b | 6678 | |
2fa291ac YQ |
6679 | #ifndef UNIX_PATH_MAX |
6680 | #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path) | |
6681 | #endif | |
0fb4aa4b | 6682 | |
2fa291ac YQ |
6683 | /* Where we put the socked used for synchronization. */ |
6684 | #define SOCK_DIR P_tmpdir | |
0fb4aa4b PA |
6685 | |
6686 | /* Thread ID of the helper thread. GDBserver reads this to know which | |
6687 | is the help thread. This is an LWP id on Linux. */ | |
6688 | int helper_thread_id; | |
6689 | ||
0fb4aa4b PA |
6690 | static int |
6691 | init_named_socket (const char *name) | |
6692 | { | |
6693 | int result, fd; | |
6694 | struct sockaddr_un addr; | |
6695 | ||
6696 | result = fd = socket (PF_UNIX, SOCK_STREAM, 0); | |
6697 | if (result == -1) | |
6698 | { | |
6699 | warning ("socket creation failed: %s", strerror (errno)); | |
6700 | return -1; | |
6701 | } | |
6702 | ||
6703 | addr.sun_family = AF_UNIX; | |
6704 | ||
6705 | strncpy (addr.sun_path, name, UNIX_PATH_MAX); | |
6706 | addr.sun_path[UNIX_PATH_MAX - 1] = '\0'; | |
6707 | ||
6708 | result = access (name, F_OK); | |
6709 | if (result == 0) | |
6710 | { | |
6711 | /* File exists. */ | |
6712 | result = unlink (name); | |
6713 | if (result == -1) | |
6714 | { | |
6715 | warning ("unlink failed: %s", strerror (errno)); | |
6716 | close (fd); | |
6717 | return -1; | |
6718 | } | |
6719 | warning ("socket %s already exists; overwriting", name); | |
6720 | } | |
6721 | ||
6722 | result = bind (fd, (struct sockaddr *) &addr, sizeof (addr)); | |
6723 | if (result == -1) | |
6724 | { | |
6725 | warning ("bind failed: %s", strerror (errno)); | |
6726 | close (fd); | |
6727 | return -1; | |
6728 | } | |
6729 | ||
6730 | result = listen (fd, 1); | |
6731 | if (result == -1) | |
6732 | { | |
6733 | warning ("listen: %s", strerror (errno)); | |
6734 | close (fd); | |
6735 | return -1; | |
6736 | } | |
6737 | ||
6738 | return fd; | |
6739 | } | |
6740 | ||
6741 | static int | |
2fa291ac | 6742 | gdb_agent_socket_init (void) |
0fb4aa4b PA |
6743 | { |
6744 | int result, fd; | |
6745 | char name[UNIX_PATH_MAX]; | |
6746 | ||
6cebaf6e | 6747 | result = xsnprintf (name, UNIX_PATH_MAX, "%s/gdb_ust%d", |
6748 | SOCK_DIR, getpid ()); | |
0fb4aa4b PA |
6749 | if (result >= UNIX_PATH_MAX) |
6750 | { | |
6751 | trace_debug ("string overflow allocating socket name"); | |
6752 | return -1; | |
6753 | } | |
6754 | ||
6755 | fd = init_named_socket (name); | |
6756 | if (fd < 0) | |
6757 | warning ("Error initializing named socket (%s) for communication with the " | |
6758 | "ust helper thread. Check that directory exists and that it " | |
6759 | "is writable.", name); | |
6760 | ||
6761 | return fd; | |
6762 | } | |
6763 | ||
2fa291ac | 6764 | #ifdef HAVE_UST |
0fb4aa4b PA |
6765 | |
6766 | /* The next marker to be returned on a qTsSTM command. */ | |
6767 | static const struct marker *next_st; | |
6768 | ||
6769 | /* Returns the first known marker. */ | |
6770 | ||
6771 | struct marker * | |
6772 | first_marker (void) | |
6773 | { | |
6774 | struct marker_iter iter; | |
6775 | ||
6776 | USTF(marker_iter_reset) (&iter); | |
6777 | USTF(marker_iter_start) (&iter); | |
6778 | ||
6779 | return iter.marker; | |
6780 | } | |
6781 | ||
6782 | /* Returns the marker following M. */ | |
6783 | ||
6784 | const struct marker * | |
6785 | next_marker (const struct marker *m) | |
6786 | { | |
6787 | struct marker_iter iter; | |
6788 | ||
6789 | USTF(marker_iter_reset) (&iter); | |
6790 | USTF(marker_iter_start) (&iter); | |
6791 | ||
6792 | for (; iter.marker != NULL; USTF(marker_iter_next) (&iter)) | |
6793 | { | |
6794 | if (iter.marker == m) | |
6795 | { | |
6796 | USTF(marker_iter_next) (&iter); | |
6797 | return iter.marker; | |
6798 | } | |
6799 | } | |
6800 | ||
6801 | return NULL; | |
6802 | } | |
6803 | ||
2fa291ac YQ |
6804 | /* Return an hexstr version of the STR C string, fit for sending to |
6805 | GDB. */ | |
6806 | ||
6807 | static char * | |
6808 | cstr_to_hexstr (const char *str) | |
6809 | { | |
6810 | int len = strlen (str); | |
6811 | char *hexstr = xmalloc (len * 2 + 1); | |
6812 | convert_int_to_ascii ((gdb_byte *) str, hexstr, len); | |
6813 | return hexstr; | |
6814 | } | |
6815 | ||
0fb4aa4b PA |
6816 | /* Compose packet that is the response to the qTsSTM/qTfSTM/qTSTMat |
6817 | packets. */ | |
6818 | ||
6819 | static void | |
6820 | response_ust_marker (char *packet, const struct marker *st) | |
6821 | { | |
6822 | char *strid, *format, *tmp; | |
6823 | ||
6824 | next_st = next_marker (st); | |
6825 | ||
6826 | tmp = xmalloc (strlen (st->channel) + 1 + | |
6827 | strlen (st->name) + 1); | |
6828 | sprintf (tmp, "%s/%s", st->channel, st->name); | |
6829 | ||
6830 | strid = cstr_to_hexstr (tmp); | |
6831 | free (tmp); | |
6832 | ||
6833 | format = cstr_to_hexstr (st->format); | |
6834 | ||
6835 | sprintf (packet, "m%s:%s:%s", | |
6836 | paddress ((uintptr_t) st->location), | |
6837 | strid, | |
6838 | format); | |
6839 | ||
6840 | free (strid); | |
6841 | free (format); | |
6842 | } | |
6843 | ||
6844 | /* Return the first static tracepoint, and initialize the state | |
6845 | machine that will iterate through all the static tracepoints. */ | |
6846 | ||
6847 | static void | |
6848 | cmd_qtfstm (char *packet) | |
6849 | { | |
6850 | trace_debug ("Returning first trace state variable definition"); | |
6851 | ||
6852 | if (first_marker ()) | |
6853 | response_ust_marker (packet, first_marker ()); | |
6854 | else | |
6855 | strcpy (packet, "l"); | |
6856 | } | |
6857 | ||
6858 | /* Return additional trace state variable definitions. */ | |
6859 | ||
6860 | static void | |
6861 | cmd_qtsstm (char *packet) | |
6862 | { | |
6863 | trace_debug ("Returning static tracepoint"); | |
6864 | ||
6865 | if (next_st) | |
6866 | response_ust_marker (packet, next_st); | |
6867 | else | |
6868 | strcpy (packet, "l"); | |
6869 | } | |
6870 | ||
6871 | /* Disconnect the GDB probe from a marker at a given address. */ | |
6872 | ||
6873 | static void | |
6874 | unprobe_marker_at (char *packet) | |
6875 | { | |
6876 | char *p = packet; | |
6877 | ULONGEST address; | |
6878 | struct marker_iter iter; | |
6879 | ||
6880 | p += sizeof ("unprobe_marker_at:") - 1; | |
6881 | ||
6882 | p = unpack_varlen_hex (p, &address); | |
6883 | ||
6884 | USTF(marker_iter_reset) (&iter); | |
6885 | USTF(marker_iter_start) (&iter); | |
6886 | for (; iter.marker != NULL; USTF(marker_iter_next) (&iter)) | |
6887 | if ((uintptr_t ) iter.marker->location == address) | |
6888 | { | |
6889 | int result; | |
6890 | ||
6891 | result = USTF(ltt_marker_disconnect) (iter.marker->channel, | |
6892 | iter.marker->name, | |
6893 | GDB_PROBE_NAME); | |
6894 | if (result < 0) | |
6895 | warning ("could not disable marker %s/%s", | |
6896 | iter.marker->channel, iter.marker->name); | |
6897 | break; | |
6898 | } | |
6899 | } | |
6900 | ||
6901 | /* Connect the GDB probe to a marker at a given address. */ | |
6902 | ||
6903 | static int | |
6904 | probe_marker_at (char *packet) | |
6905 | { | |
6906 | char *p = packet; | |
6907 | ULONGEST address; | |
6908 | struct marker_iter iter; | |
6909 | struct marker *m; | |
6910 | ||
6911 | p += sizeof ("probe_marker_at:") - 1; | |
6912 | ||
6913 | p = unpack_varlen_hex (p, &address); | |
6914 | ||
6915 | USTF(marker_iter_reset) (&iter); | |
6916 | ||
6917 | for (USTF(marker_iter_start) (&iter), m = iter.marker; | |
6918 | m != NULL; | |
6919 | USTF(marker_iter_next) (&iter), m = iter.marker) | |
6920 | if ((uintptr_t ) m->location == address) | |
6921 | { | |
6922 | int result; | |
6923 | ||
6924 | trace_debug ("found marker for address. " | |
6925 | "ltt_marker_connect (marker = %s/%s)", | |
6926 | m->channel, m->name); | |
6927 | ||
493e2a69 MS |
6928 | result = USTF(ltt_marker_connect) (m->channel, m->name, |
6929 | GDB_PROBE_NAME); | |
0fb4aa4b PA |
6930 | if (result && result != -EEXIST) |
6931 | trace_debug ("ltt_marker_connect (marker = %s/%s, errno = %d)", | |
6932 | m->channel, m->name, -result); | |
6933 | ||
6934 | if (result < 0) | |
6935 | { | |
6936 | sprintf (packet, "E.could not connect marker: channel=%s, name=%s", | |
6937 | m->channel, m->name); | |
6938 | return -1; | |
6939 | } | |
6940 | ||
6941 | strcpy (packet, "OK"); | |
6942 | return 0; | |
6943 | } | |
6944 | ||
6945 | sprintf (packet, "E.no marker found at 0x%s", paddress (address)); | |
6946 | return -1; | |
6947 | } | |
6948 | ||
6949 | static int | |
6950 | cmd_qtstmat (char *packet) | |
6951 | { | |
6952 | char *p = packet; | |
6953 | ULONGEST address; | |
6954 | struct marker_iter iter; | |
6955 | struct marker *m; | |
6956 | ||
6957 | p += sizeof ("qTSTMat:") - 1; | |
6958 | ||
6959 | p = unpack_varlen_hex (p, &address); | |
6960 | ||
6961 | USTF(marker_iter_reset) (&iter); | |
6962 | ||
6963 | for (USTF(marker_iter_start) (&iter), m = iter.marker; | |
6964 | m != NULL; | |
6965 | USTF(marker_iter_next) (&iter), m = iter.marker) | |
6966 | if ((uintptr_t ) m->location == address) | |
6967 | { | |
6968 | response_ust_marker (packet, m); | |
6969 | return 0; | |
6970 | } | |
6971 | ||
6972 | strcpy (packet, "l"); | |
6973 | return -1; | |
6974 | } | |
6975 | ||
2fa291ac YQ |
6976 | static void |
6977 | gdb_ust_init (void) | |
6978 | { | |
6979 | if (!dlsym_ust ()) | |
6980 | return; | |
6981 | ||
6982 | USTF(ltt_probe_register) (&gdb_ust_probe); | |
6983 | } | |
6984 | ||
6985 | #endif /* HAVE_UST */ | |
6986 | ||
82067193 YQ |
6987 | #include <sys/syscall.h> |
6988 | ||
2fa291ac YQ |
6989 | /* Helper thread of agent. */ |
6990 | ||
0fb4aa4b | 6991 | static void * |
2fa291ac | 6992 | gdb_agent_helper_thread (void *arg) |
0fb4aa4b PA |
6993 | { |
6994 | int listen_fd; | |
6995 | ||
6996 | while (1) | |
6997 | { | |
2fa291ac | 6998 | listen_fd = gdb_agent_socket_init (); |
0fb4aa4b | 6999 | |
0fb4aa4b PA |
7000 | if (helper_thread_id == 0) |
7001 | helper_thread_id = syscall (SYS_gettid); | |
0fb4aa4b PA |
7002 | |
7003 | if (listen_fd == -1) | |
7004 | { | |
7005 | warning ("could not create sync socket\n"); | |
7006 | break; | |
7007 | } | |
7008 | ||
7009 | while (1) | |
7010 | { | |
7011 | socklen_t tmp; | |
7012 | struct sockaddr_un sockaddr; | |
7013 | int fd; | |
7014 | char buf[1]; | |
7015 | int ret; | |
7016 | ||
7017 | tmp = sizeof (sockaddr); | |
7018 | ||
7019 | do | |
7020 | { | |
7021 | fd = accept (listen_fd, &sockaddr, &tmp); | |
7022 | } | |
7023 | /* It seems an ERESTARTSYS can escape out of accept. */ | |
7024 | while (fd == -512 || (fd == -1 && errno == EINTR)); | |
7025 | ||
7026 | if (fd < 0) | |
7027 | { | |
7028 | warning ("Accept returned %d, error: %s\n", | |
7029 | fd, strerror (errno)); | |
7030 | break; | |
7031 | } | |
7032 | ||
7033 | do | |
7034 | { | |
7035 | ret = read (fd, buf, 1); | |
7036 | } while (ret == -1 && errno == EINTR); | |
7037 | ||
7038 | if (ret == -1) | |
7039 | { | |
7040 | warning ("reading socket (fd=%d) failed with %s", | |
7041 | fd, strerror (errno)); | |
7042 | close (fd); | |
7043 | break; | |
7044 | } | |
7045 | ||
7046 | if (cmd_buf[0]) | |
7047 | { | |
2fa291ac | 7048 | #ifdef HAVE_UST |
0fb4aa4b PA |
7049 | if (strcmp ("qTfSTM", cmd_buf) == 0) |
7050 | { | |
7051 | cmd_qtfstm (cmd_buf); | |
7052 | } | |
7053 | else if (strcmp ("qTsSTM", cmd_buf) == 0) | |
7054 | { | |
7055 | cmd_qtsstm (cmd_buf); | |
7056 | } | |
7057 | else if (strncmp ("unprobe_marker_at:", | |
7058 | cmd_buf, | |
7059 | sizeof ("unprobe_marker_at:") - 1) == 0) | |
7060 | { | |
7061 | unprobe_marker_at (cmd_buf); | |
7062 | } | |
7063 | else if (strncmp ("probe_marker_at:", | |
7064 | cmd_buf, | |
7065 | sizeof ("probe_marker_at:") - 1) == 0) | |
7066 | { | |
7067 | probe_marker_at (cmd_buf); | |
7068 | } | |
7069 | else if (strncmp ("qTSTMat:", | |
7070 | cmd_buf, | |
7071 | sizeof ("qTSTMat:") - 1) == 0) | |
7072 | { | |
7073 | cmd_qtstmat (cmd_buf); | |
7074 | } | |
2fa291ac | 7075 | #endif /* HAVE_UST */ |
0fb4aa4b PA |
7076 | } |
7077 | ||
712c6575 YQ |
7078 | /* Fix compiler's warning: ignoring return value of 'write'. */ |
7079 | ret = write (fd, buf, 1); | |
0fb4aa4b PA |
7080 | close (fd); |
7081 | } | |
7082 | } | |
7083 | ||
7084 | return NULL; | |
7085 | } | |
7086 | ||
7087 | #include <signal.h> | |
2fa291ac | 7088 | #include <pthread.h> |
0fb4aa4b | 7089 | |
8ffcbaaf YQ |
7090 | IP_AGENT_EXPORT int gdb_agent_capability = AGENT_CAPA_STATIC_TRACE; |
7091 | ||
0fb4aa4b | 7092 | static void |
2fa291ac | 7093 | gdb_agent_init (void) |
0fb4aa4b PA |
7094 | { |
7095 | int res; | |
7096 | pthread_t thread; | |
7097 | sigset_t new_mask; | |
7098 | sigset_t orig_mask; | |
7099 | ||
0fb4aa4b PA |
7100 | /* We want the helper thread to be as transparent as possible, so |
7101 | have it inherit an all-signals-blocked mask. */ | |
7102 | ||
7103 | sigfillset (&new_mask); | |
7104 | res = pthread_sigmask (SIG_SETMASK, &new_mask, &orig_mask); | |
7105 | if (res) | |
7106 | fatal ("pthread_sigmask (1) failed: %s", strerror (res)); | |
7107 | ||
7108 | res = pthread_create (&thread, | |
7109 | NULL, | |
2fa291ac | 7110 | gdb_agent_helper_thread, |
0fb4aa4b PA |
7111 | NULL); |
7112 | ||
7113 | res = pthread_sigmask (SIG_SETMASK, &orig_mask, NULL); | |
7114 | if (res) | |
7115 | fatal ("pthread_sigmask (2) failed: %s", strerror (res)); | |
7116 | ||
7117 | while (helper_thread_id == 0) | |
7118 | usleep (1); | |
7119 | ||
2fa291ac YQ |
7120 | #ifdef HAVE_UST |
7121 | gdb_ust_init (); | |
7122 | #endif | |
0fb4aa4b PA |
7123 | } |
7124 | ||
0fb4aa4b PA |
7125 | #include <sys/mman.h> |
7126 | #include <fcntl.h> | |
7127 | ||
7128 | IP_AGENT_EXPORT char *gdb_tp_heap_buffer; | |
7129 | IP_AGENT_EXPORT char *gdb_jump_pad_buffer; | |
7130 | IP_AGENT_EXPORT char *gdb_jump_pad_buffer_end; | |
405f8e94 SS |
7131 | IP_AGENT_EXPORT char *gdb_trampoline_buffer; |
7132 | IP_AGENT_EXPORT char *gdb_trampoline_buffer_end; | |
7133 | IP_AGENT_EXPORT char *gdb_trampoline_buffer_error; | |
7134 | ||
7135 | /* Record the result of getting buffer space for fast tracepoint | |
7136 | trampolines. Any error message is copied, since caller may not be | |
7137 | using persistent storage. */ | |
7138 | ||
7139 | void | |
7140 | set_trampoline_buffer_space (CORE_ADDR begin, CORE_ADDR end, char *errmsg) | |
7141 | { | |
7142 | gdb_trampoline_buffer = (char *) (uintptr_t) begin; | |
7143 | gdb_trampoline_buffer_end = (char *) (uintptr_t) end; | |
7144 | if (errmsg) | |
7145 | strncpy (gdb_trampoline_buffer_error, errmsg, 99); | |
7146 | else | |
7147 | strcpy (gdb_trampoline_buffer_error, "no buffer passed"); | |
7148 | } | |
0fb4aa4b PA |
7149 | |
7150 | static void __attribute__ ((constructor)) | |
7151 | initialize_tracepoint_ftlib (void) | |
7152 | { | |
7153 | initialize_tracepoint (); | |
7154 | ||
2fa291ac | 7155 | gdb_agent_init (); |
0fb4aa4b PA |
7156 | } |
7157 | ||
7158 | #endif /* IN_PROCESS_AGENT */ | |
fa593d66 | 7159 | |
f196051f SS |
7160 | /* Return a timestamp, expressed as microseconds of the usual Unix |
7161 | time. (As the result is a 64-bit number, it will not overflow any | |
7162 | time soon.) */ | |
7163 | ||
219f2f23 | 7164 | static LONGEST |
f196051f | 7165 | get_timestamp (void) |
219f2f23 PA |
7166 | { |
7167 | struct timeval tv; | |
7168 | ||
7169 | if (gettimeofday (&tv, 0) != 0) | |
7170 | return -1; | |
7171 | else | |
7172 | return (LONGEST) tv.tv_sec * 1000000 + tv.tv_usec; | |
7173 | } | |
7174 | ||
7175 | void | |
7176 | initialize_tracepoint (void) | |
7177 | { | |
7178 | /* There currently no way to change the buffer size. */ | |
7179 | const int sizeOfBuffer = 5 * 1024 * 1024; | |
7180 | unsigned char *buf = xmalloc (sizeOfBuffer); | |
7181 | init_trace_buffer (buf, sizeOfBuffer); | |
7182 | ||
7183 | /* Wire trace state variable 1 to be the timestamp. This will be | |
7184 | uploaded to GDB upon connection and become one of its trace state | |
7185 | variables. (In case you're wondering, if GDB already has a trace | |
7186 | variable numbered 1, it will be renumbered.) */ | |
fa593d66 | 7187 | create_trace_state_variable (1, 0); |
219f2f23 | 7188 | set_trace_state_variable_name (1, "trace_timestamp"); |
f196051f | 7189 | set_trace_state_variable_getter (1, get_timestamp); |
fa593d66 PA |
7190 | |
7191 | #ifdef IN_PROCESS_AGENT | |
7192 | { | |
fc1ab1a0 | 7193 | uintptr_t addr; |
fa593d66 | 7194 | int pagesize; |
fc1ab1a0 | 7195 | |
fa593d66 PA |
7196 | pagesize = sysconf (_SC_PAGE_SIZE); |
7197 | if (pagesize == -1) | |
7198 | fatal ("sysconf"); | |
7199 | ||
7200 | gdb_tp_heap_buffer = xmalloc (5 * 1024 * 1024); | |
7201 | ||
fc1ab1a0 PA |
7202 | #define SCRATCH_BUFFER_NPAGES 20 |
7203 | ||
7204 | /* Allocate scratch buffer aligned on a page boundary, at a low | |
7205 | address (close to the main executable's code). */ | |
7206 | for (addr = pagesize; addr != 0; addr += pagesize) | |
7207 | { | |
7208 | gdb_jump_pad_buffer = mmap ((void *) addr, pagesize * SCRATCH_BUFFER_NPAGES, | |
7209 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
7210 | MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, | |
7211 | -1, 0); | |
7212 | if (gdb_jump_pad_buffer != MAP_FAILED) | |
7213 | break; | |
7214 | } | |
fa593d66 | 7215 | |
fc1ab1a0 | 7216 | if (addr == 0) |
fa593d66 | 7217 | fatal ("\ |
fc1ab1a0 PA |
7218 | initialize_tracepoint: mmap'ing jump pad buffer failed with %s", |
7219 | strerror (errno)); | |
7220 | ||
7221 | gdb_jump_pad_buffer_end = gdb_jump_pad_buffer + pagesize * SCRATCH_BUFFER_NPAGES; | |
fa593d66 PA |
7222 | } |
7223 | ||
405f8e94 SS |
7224 | gdb_trampoline_buffer = gdb_trampoline_buffer_end = 0; |
7225 | ||
7226 | /* It's not a fatal error for something to go wrong with trampoline | |
7227 | buffer setup, but it can be mysterious, so create a channel to | |
7228 | report back on what went wrong, using a fixed size since we may | |
7229 | not be able to allocate space later when the problem occurs. */ | |
7230 | gdb_trampoline_buffer_error = xmalloc (IPA_BUFSIZ); | |
7231 | ||
7232 | strcpy (gdb_trampoline_buffer_error, "No errors reported"); | |
7233 | ||
fa593d66 PA |
7234 | initialize_low_tracepoint (); |
7235 | #endif | |
219f2f23 | 7236 | } |