Commit | Line | Data |
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219f2f23 | 1 | /* Tracepoint code for remote server for GDB. |
32d0add0 | 2 | Copyright (C) 2009-2015 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" | |
c144c7a0 | 20 | #include "tracepoint.h" |
623b6bdf | 21 | #include "gdbthread.h" |
2fa291ac | 22 | #include "agent.h" |
9c3d6531 | 23 | #include "rsp-low.h" |
2fa291ac | 24 | |
219f2f23 PA |
25 | #include <ctype.h> |
26 | #include <fcntl.h> | |
27 | #include <unistd.h> | |
28 | #include <sys/time.h> | |
5f18041e | 29 | #include <inttypes.h> |
fa593d66 | 30 | #include <stdint.h> |
0ab5faf9 | 31 | |
5e1dc496 | 32 | #include "ax.h" |
3aee8918 | 33 | #include "tdesc.h" |
219f2f23 | 34 | |
f6f899bf HAQ |
35 | #define DEFAULT_TRACE_BUFFER_SIZE 5242880 /* 5*1024*1024 */ |
36 | ||
61adf464 | 37 | /* This file is built for both GDBserver, and the in-process |
fa593d66 PA |
38 | agent (IPA), a shared library that includes a tracing agent that is |
39 | loaded by the inferior to support fast tracepoints. Fast | |
40 | tracepoints (or more accurately, jump based tracepoints) are | |
41 | implemented by patching the tracepoint location with a jump into a | |
42 | small trampoline function whose job is to save the register state, | |
43 | call the in-process tracing agent, and then execute the original | |
44 | instruction that was under the tracepoint jump (possibly adjusted, | |
45 | if PC-relative, or some such). | |
46 | ||
47 | The current synchronization design is pull based. That means, | |
48 | GDBserver does most of the work, by peeking/poking at the inferior | |
49 | agent's memory directly for downloading tracepoint and associated | |
50 | objects, and for uploading trace frames. Whenever the IPA needs | |
51 | something from GDBserver (trace buffer is full, tracing stopped for | |
52 | some reason, etc.) the IPA calls a corresponding hook function | |
53 | where GDBserver has placed a breakpoint. | |
54 | ||
55 | Each of the agents has its own trace buffer. When browsing the | |
56 | trace frames built from slow and fast tracepoints from GDB (tfind | |
57 | mode), there's no guarantee the user is seeing the trace frames in | |
58 | strict chronological creation order, although, GDBserver tries to | |
59 | keep the order relatively reasonable, by syncing the trace buffers | |
60 | at appropriate times. | |
61 | ||
62 | */ | |
63 | ||
87ce2a04 DE |
64 | #ifdef IN_PROCESS_AGENT |
65 | ||
18c1b81a | 66 | static void trace_vdebug (const char *, ...) ATTRIBUTE_PRINTF (1, 2); |
219f2f23 PA |
67 | |
68 | static void | |
fa593d66 | 69 | trace_vdebug (const char *fmt, ...) |
219f2f23 PA |
70 | { |
71 | char buf[1024]; | |
72 | va_list ap; | |
73 | ||
74 | va_start (ap, fmt); | |
75 | vsprintf (buf, fmt, ap); | |
5e1dc496 | 76 | fprintf (stderr, PROG "/tracepoint: %s\n", buf); |
219f2f23 PA |
77 | va_end (ap); |
78 | } | |
79 | ||
fa593d66 | 80 | #define trace_debug_1(level, fmt, args...) \ |
219f2f23 | 81 | do { \ |
32d92999 | 82 | if (level <= debug_threads) \ |
fa593d66 | 83 | trace_vdebug ((fmt), ##args); \ |
219f2f23 PA |
84 | } while (0) |
85 | ||
87ce2a04 DE |
86 | #else |
87 | ||
88 | #define trace_debug_1(level, fmt, args...) \ | |
89 | do { \ | |
90 | if (level <= debug_threads) \ | |
91 | { \ | |
92 | debug_printf ((fmt), ##args); \ | |
93 | debug_printf ("\n"); \ | |
94 | } \ | |
95 | } while (0) | |
96 | ||
97 | #endif | |
98 | ||
fa593d66 PA |
99 | #define trace_debug(FMT, args...) \ |
100 | trace_debug_1 (1, FMT, ##args) | |
101 | ||
102 | #if defined(__GNUC__) | |
103 | # define ATTR_USED __attribute__((used)) | |
104 | # define ATTR_NOINLINE __attribute__((noinline)) | |
105 | # define ATTR_CONSTRUCTOR __attribute__ ((constructor)) | |
106 | #else | |
107 | # define ATTR_USED | |
108 | # define ATTR_NOINLINE | |
109 | # define ATTR_CONSTRUCTOR | |
110 | #endif | |
111 | ||
112 | /* Make sure the functions the IPA needs to export (symbols GDBserver | |
113 | needs to query GDB about) are exported. */ | |
114 | ||
115 | #ifdef IN_PROCESS_AGENT | |
116 | # if defined _WIN32 || defined __CYGWIN__ | |
117 | # define IP_AGENT_EXPORT __declspec(dllexport) ATTR_USED | |
118 | # else | |
119 | # if __GNUC__ >= 4 | |
120 | # define IP_AGENT_EXPORT \ | |
121 | __attribute__ ((visibility("default"))) ATTR_USED | |
122 | # else | |
123 | # define IP_AGENT_EXPORT ATTR_USED | |
124 | # endif | |
125 | # endif | |
126 | #else | |
127 | # define IP_AGENT_EXPORT | |
128 | #endif | |
129 | ||
130 | /* Prefix exported symbols, for good citizenship. All the symbols | |
131 | that need exporting are defined in this module. */ | |
132 | #ifdef IN_PROCESS_AGENT | |
133 | # define gdb_tp_heap_buffer gdb_agent_gdb_tp_heap_buffer | |
134 | # define gdb_jump_pad_buffer gdb_agent_gdb_jump_pad_buffer | |
135 | # define gdb_jump_pad_buffer_end gdb_agent_gdb_jump_pad_buffer_end | |
405f8e94 SS |
136 | # define gdb_trampoline_buffer gdb_agent_gdb_trampoline_buffer |
137 | # define gdb_trampoline_buffer_end gdb_agent_gdb_trampoline_buffer_end | |
138 | # define gdb_trampoline_buffer_error gdb_agent_gdb_trampoline_buffer_error | |
fa593d66 PA |
139 | # define collecting gdb_agent_collecting |
140 | # define gdb_collect gdb_agent_gdb_collect | |
141 | # define stop_tracing gdb_agent_stop_tracing | |
142 | # define flush_trace_buffer gdb_agent_flush_trace_buffer | |
143 | # define about_to_request_buffer_space gdb_agent_about_to_request_buffer_space | |
144 | # define trace_buffer_is_full gdb_agent_trace_buffer_is_full | |
145 | # define stopping_tracepoint gdb_agent_stopping_tracepoint | |
146 | # define expr_eval_result gdb_agent_expr_eval_result | |
147 | # define error_tracepoint gdb_agent_error_tracepoint | |
148 | # define tracepoints gdb_agent_tracepoints | |
149 | # define tracing gdb_agent_tracing | |
150 | # define trace_buffer_ctrl gdb_agent_trace_buffer_ctrl | |
151 | # define trace_buffer_ctrl_curr gdb_agent_trace_buffer_ctrl_curr | |
152 | # define trace_buffer_lo gdb_agent_trace_buffer_lo | |
153 | # define trace_buffer_hi gdb_agent_trace_buffer_hi | |
154 | # define traceframe_read_count gdb_agent_traceframe_read_count | |
155 | # define traceframe_write_count gdb_agent_traceframe_write_count | |
156 | # define traceframes_created gdb_agent_traceframes_created | |
157 | # define trace_state_variables gdb_agent_trace_state_variables | |
6a271cae | 158 | # define get_raw_reg gdb_agent_get_raw_reg |
493e2a69 MS |
159 | # define get_trace_state_variable_value \ |
160 | gdb_agent_get_trace_state_variable_value | |
161 | # define set_trace_state_variable_value \ | |
162 | gdb_agent_set_trace_state_variable_value | |
0fb4aa4b PA |
163 | # define ust_loaded gdb_agent_ust_loaded |
164 | # define helper_thread_id gdb_agent_helper_thread_id | |
165 | # define cmd_buf gdb_agent_cmd_buf | |
fa593d66 PA |
166 | #endif |
167 | ||
168 | #ifndef IN_PROCESS_AGENT | |
169 | ||
170 | /* Addresses of in-process agent's symbols GDBserver cares about. */ | |
171 | ||
172 | struct ipa_sym_addresses | |
173 | { | |
174 | CORE_ADDR addr_gdb_tp_heap_buffer; | |
175 | CORE_ADDR addr_gdb_jump_pad_buffer; | |
176 | CORE_ADDR addr_gdb_jump_pad_buffer_end; | |
405f8e94 SS |
177 | CORE_ADDR addr_gdb_trampoline_buffer; |
178 | CORE_ADDR addr_gdb_trampoline_buffer_end; | |
179 | CORE_ADDR addr_gdb_trampoline_buffer_error; | |
fa593d66 PA |
180 | CORE_ADDR addr_collecting; |
181 | CORE_ADDR addr_gdb_collect; | |
182 | CORE_ADDR addr_stop_tracing; | |
183 | CORE_ADDR addr_flush_trace_buffer; | |
184 | CORE_ADDR addr_about_to_request_buffer_space; | |
185 | CORE_ADDR addr_trace_buffer_is_full; | |
186 | CORE_ADDR addr_stopping_tracepoint; | |
187 | CORE_ADDR addr_expr_eval_result; | |
188 | CORE_ADDR addr_error_tracepoint; | |
189 | CORE_ADDR addr_tracepoints; | |
190 | CORE_ADDR addr_tracing; | |
191 | CORE_ADDR addr_trace_buffer_ctrl; | |
192 | CORE_ADDR addr_trace_buffer_ctrl_curr; | |
193 | CORE_ADDR addr_trace_buffer_lo; | |
194 | CORE_ADDR addr_trace_buffer_hi; | |
195 | CORE_ADDR addr_traceframe_read_count; | |
196 | CORE_ADDR addr_traceframe_write_count; | |
197 | CORE_ADDR addr_traceframes_created; | |
198 | CORE_ADDR addr_trace_state_variables; | |
6a271cae PA |
199 | CORE_ADDR addr_get_raw_reg; |
200 | CORE_ADDR addr_get_trace_state_variable_value; | |
201 | CORE_ADDR addr_set_trace_state_variable_value; | |
0fb4aa4b | 202 | CORE_ADDR addr_ust_loaded; |
fa593d66 PA |
203 | }; |
204 | ||
fa593d66 PA |
205 | static struct |
206 | { | |
207 | const char *name; | |
208 | int offset; | |
209 | int required; | |
210 | } symbol_list[] = { | |
211 | IPA_SYM(gdb_tp_heap_buffer), | |
212 | IPA_SYM(gdb_jump_pad_buffer), | |
213 | IPA_SYM(gdb_jump_pad_buffer_end), | |
405f8e94 SS |
214 | IPA_SYM(gdb_trampoline_buffer), |
215 | IPA_SYM(gdb_trampoline_buffer_end), | |
216 | IPA_SYM(gdb_trampoline_buffer_error), | |
fa593d66 PA |
217 | IPA_SYM(collecting), |
218 | IPA_SYM(gdb_collect), | |
219 | IPA_SYM(stop_tracing), | |
220 | IPA_SYM(flush_trace_buffer), | |
221 | IPA_SYM(about_to_request_buffer_space), | |
222 | IPA_SYM(trace_buffer_is_full), | |
223 | IPA_SYM(stopping_tracepoint), | |
224 | IPA_SYM(expr_eval_result), | |
225 | IPA_SYM(error_tracepoint), | |
226 | IPA_SYM(tracepoints), | |
227 | IPA_SYM(tracing), | |
228 | IPA_SYM(trace_buffer_ctrl), | |
229 | IPA_SYM(trace_buffer_ctrl_curr), | |
230 | IPA_SYM(trace_buffer_lo), | |
231 | IPA_SYM(trace_buffer_hi), | |
232 | IPA_SYM(traceframe_read_count), | |
233 | IPA_SYM(traceframe_write_count), | |
234 | IPA_SYM(traceframes_created), | |
235 | IPA_SYM(trace_state_variables), | |
6a271cae PA |
236 | IPA_SYM(get_raw_reg), |
237 | IPA_SYM(get_trace_state_variable_value), | |
238 | IPA_SYM(set_trace_state_variable_value), | |
0fb4aa4b | 239 | IPA_SYM(ust_loaded), |
fa593d66 PA |
240 | }; |
241 | ||
2fa291ac | 242 | static struct ipa_sym_addresses ipa_sym_addrs; |
fa593d66 | 243 | |
fa593d66 PA |
244 | static int read_inferior_integer (CORE_ADDR symaddr, int *val); |
245 | ||
0fb4aa4b | 246 | /* Returns true if both the in-process agent library and the static |
8ffcbaaf YQ |
247 | tracepoints libraries are loaded in the inferior, and agent has |
248 | capability on static tracepoints. */ | |
0fb4aa4b PA |
249 | |
250 | static int | |
8ffcbaaf | 251 | in_process_agent_supports_ust (void) |
0fb4aa4b PA |
252 | { |
253 | int loaded = 0; | |
254 | ||
58b4daa5 | 255 | if (!agent_loaded_p ()) |
0fb4aa4b PA |
256 | { |
257 | warning ("In-process agent not loaded"); | |
258 | return 0; | |
259 | } | |
260 | ||
8ffcbaaf | 261 | if (agent_capability_check (AGENT_CAPA_STATIC_TRACE)) |
0fb4aa4b | 262 | { |
8ffcbaaf YQ |
263 | /* Agent understands static tracepoint, then check whether UST is in |
264 | fact loaded in the inferior. */ | |
265 | if (read_inferior_integer (ipa_sym_addrs.addr_ust_loaded, &loaded)) | |
266 | { | |
267 | warning ("Error reading ust_loaded in lib"); | |
268 | return 0; | |
269 | } | |
0fb4aa4b | 270 | |
8ffcbaaf YQ |
271 | return loaded; |
272 | } | |
273 | else | |
274 | return 0; | |
0fb4aa4b PA |
275 | } |
276 | ||
fa593d66 PA |
277 | static void |
278 | write_e_ipa_not_loaded (char *buffer) | |
279 | { | |
280 | sprintf (buffer, | |
281 | "E.In-process agent library not loaded in process. " | |
0fb4aa4b PA |
282 | "Fast and static tracepoints unavailable."); |
283 | } | |
284 | ||
285 | /* Write an error to BUFFER indicating that UST isn't loaded in the | |
286 | inferior. */ | |
287 | ||
288 | static void | |
289 | write_e_ust_not_loaded (char *buffer) | |
290 | { | |
291 | #ifdef HAVE_UST | |
292 | sprintf (buffer, | |
293 | "E.UST library not loaded in process. " | |
294 | "Static tracepoints unavailable."); | |
295 | #else | |
296 | sprintf (buffer, "E.GDBserver was built without static tracepoints support"); | |
297 | #endif | |
fa593d66 PA |
298 | } |
299 | ||
0fb4aa4b PA |
300 | /* If the in-process agent library isn't loaded in the inferior, write |
301 | an error to BUFFER, and return 1. Otherwise, return 0. */ | |
302 | ||
fa593d66 PA |
303 | static int |
304 | maybe_write_ipa_not_loaded (char *buffer) | |
305 | { | |
58b4daa5 | 306 | if (!agent_loaded_p ()) |
fa593d66 PA |
307 | { |
308 | write_e_ipa_not_loaded (buffer); | |
309 | return 1; | |
310 | } | |
311 | return 0; | |
312 | } | |
313 | ||
0fb4aa4b PA |
314 | /* If the in-process agent library and the ust (static tracepoints) |
315 | library aren't loaded in the inferior, write an error to BUFFER, | |
316 | and return 1. Otherwise, return 0. */ | |
317 | ||
318 | static int | |
319 | maybe_write_ipa_ust_not_loaded (char *buffer) | |
320 | { | |
58b4daa5 | 321 | if (!agent_loaded_p ()) |
0fb4aa4b PA |
322 | { |
323 | write_e_ipa_not_loaded (buffer); | |
324 | return 1; | |
325 | } | |
8ffcbaaf | 326 | else if (!in_process_agent_supports_ust ()) |
0fb4aa4b PA |
327 | { |
328 | write_e_ust_not_loaded (buffer); | |
329 | return 1; | |
330 | } | |
331 | return 0; | |
332 | } | |
333 | ||
fa593d66 PA |
334 | /* Cache all future symbols that the tracepoints module might request. |
335 | We can not request symbols at arbitrary states in the remote | |
336 | protocol, only when the client tells us that new symbols are | |
337 | available. So when we load the in-process library, make sure to | |
338 | check the entire list. */ | |
339 | ||
340 | void | |
341 | tracepoint_look_up_symbols (void) | |
342 | { | |
fa593d66 PA |
343 | int i; |
344 | ||
58b4daa5 | 345 | if (agent_loaded_p ()) |
fa593d66 PA |
346 | return; |
347 | ||
fa593d66 PA |
348 | for (i = 0; i < sizeof (symbol_list) / sizeof (symbol_list[0]); i++) |
349 | { | |
350 | CORE_ADDR *addrp = | |
351 | (CORE_ADDR *) ((char *) &ipa_sym_addrs + symbol_list[i].offset); | |
352 | ||
353 | if (look_up_one_symbol (symbol_list[i].name, addrp, 1) == 0) | |
354 | { | |
355 | if (debug_threads) | |
87ce2a04 | 356 | debug_printf ("symbol `%s' not found\n", symbol_list[i].name); |
2275a1a7 | 357 | return; |
fa593d66 PA |
358 | } |
359 | } | |
360 | ||
5808517f | 361 | agent_look_up_symbols (NULL); |
fa593d66 PA |
362 | } |
363 | ||
364 | #endif | |
365 | ||
366 | /* GDBserver places a breakpoint on the IPA's version (which is a nop) | |
367 | of the "stop_tracing" function. When this breakpoint is hit, | |
368 | tracing stopped in the IPA for some reason. E.g., due to | |
369 | tracepoint reaching the pass count, hitting conditional expression | |
370 | evaluation error, etc. | |
371 | ||
372 | The IPA's trace buffer is never in circular tracing mode: instead, | |
373 | GDBserver's is, and whenever the in-process buffer fills, it calls | |
374 | "flush_trace_buffer", which triggers an internal breakpoint. | |
375 | GDBserver reacts to this breakpoint by pulling the meanwhile | |
376 | collected data. Old frames discarding is always handled on the | |
377 | GDBserver side. */ | |
378 | ||
379 | #ifdef IN_PROCESS_AGENT | |
fa593d66 PA |
380 | int |
381 | read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) | |
382 | { | |
383 | memcpy (myaddr, (void *) (uintptr_t) memaddr, len); | |
384 | return 0; | |
385 | } | |
386 | ||
387 | /* Call this in the functions where GDBserver places a breakpoint, so | |
388 | that the compiler doesn't try to be clever and skip calling the | |
389 | function at all. This is necessary, even if we tell the compiler | |
390 | to not inline said functions. */ | |
391 | ||
392 | #if defined(__GNUC__) | |
393 | # define UNKNOWN_SIDE_EFFECTS() asm ("") | |
394 | #else | |
395 | # define UNKNOWN_SIDE_EFFECTS() do {} while (0) | |
396 | #endif | |
397 | ||
398 | IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE | |
399 | stop_tracing (void) | |
400 | { | |
401 | /* GDBserver places breakpoint here. */ | |
402 | UNKNOWN_SIDE_EFFECTS(); | |
403 | } | |
404 | ||
405 | IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE | |
406 | flush_trace_buffer (void) | |
407 | { | |
408 | /* GDBserver places breakpoint here. */ | |
409 | UNKNOWN_SIDE_EFFECTS(); | |
410 | } | |
411 | ||
412 | #endif | |
413 | ||
414 | #ifndef IN_PROCESS_AGENT | |
219f2f23 PA |
415 | static int |
416 | tracepoint_handler (CORE_ADDR address) | |
417 | { | |
418 | trace_debug ("tracepoint_handler: tracepoint at 0x%s hit", | |
419 | paddress (address)); | |
420 | return 0; | |
421 | } | |
422 | ||
fa593d66 PA |
423 | /* Breakpoint at "stop_tracing" in the inferior lib. */ |
424 | struct breakpoint *stop_tracing_bkpt; | |
425 | static int stop_tracing_handler (CORE_ADDR); | |
426 | ||
427 | /* Breakpoint at "flush_trace_buffer" in the inferior lib. */ | |
428 | struct breakpoint *flush_trace_buffer_bkpt; | |
429 | static int flush_trace_buffer_handler (CORE_ADDR); | |
430 | ||
fa593d66 PA |
431 | static void download_trace_state_variables (void); |
432 | static void upload_fast_traceframes (void); | |
433 | ||
42476b70 | 434 | static int run_inferior_command (char *cmd, int len); |
0fb4aa4b | 435 | |
fa593d66 PA |
436 | static int |
437 | read_inferior_integer (CORE_ADDR symaddr, int *val) | |
438 | { | |
439 | return read_inferior_memory (symaddr, (unsigned char *) val, | |
440 | sizeof (*val)); | |
441 | } | |
442 | ||
42476b70 YQ |
443 | struct tracepoint; |
444 | static int tracepoint_send_agent (struct tracepoint *tpoint); | |
445 | ||
fa593d66 PA |
446 | static int |
447 | read_inferior_uinteger (CORE_ADDR symaddr, unsigned int *val) | |
448 | { | |
449 | return read_inferior_memory (symaddr, (unsigned char *) val, | |
450 | sizeof (*val)); | |
451 | } | |
452 | ||
453 | static int | |
454 | read_inferior_data_pointer (CORE_ADDR symaddr, CORE_ADDR *val) | |
455 | { | |
456 | void *pval = (void *) (uintptr_t) val; | |
457 | int ret; | |
458 | ||
459 | ret = read_inferior_memory (symaddr, (unsigned char *) &pval, sizeof (pval)); | |
460 | *val = (uintptr_t) pval; | |
461 | return ret; | |
462 | } | |
463 | ||
464 | static int | |
465 | write_inferior_data_pointer (CORE_ADDR symaddr, CORE_ADDR val) | |
466 | { | |
467 | void *pval = (void *) (uintptr_t) val; | |
468 | return write_inferior_memory (symaddr, | |
469 | (unsigned char *) &pval, sizeof (pval)); | |
470 | } | |
471 | ||
472 | static int | |
473 | write_inferior_integer (CORE_ADDR symaddr, int val) | |
474 | { | |
475 | return write_inferior_memory (symaddr, (unsigned char *) &val, sizeof (val)); | |
476 | } | |
477 | ||
478 | static int | |
479 | write_inferior_uinteger (CORE_ADDR symaddr, unsigned int val) | |
480 | { | |
481 | return write_inferior_memory (symaddr, (unsigned char *) &val, sizeof (val)); | |
482 | } | |
483 | ||
8d0d92cd YQ |
484 | static CORE_ADDR target_malloc (ULONGEST size); |
485 | static int write_inferior_data_ptr (CORE_ADDR where, CORE_ADDR ptr); | |
42476b70 YQ |
486 | |
487 | #define COPY_FIELD_TO_BUF(BUF, OBJ, FIELD) \ | |
488 | do { \ | |
489 | memcpy (BUF, &(OBJ)->FIELD, sizeof ((OBJ)->FIELD)); \ | |
490 | BUF += sizeof ((OBJ)->FIELD); \ | |
491 | } while (0) | |
492 | ||
fa593d66 PA |
493 | #endif |
494 | ||
8d0d92cd YQ |
495 | /* Operations on various types of tracepoint actions. */ |
496 | ||
497 | struct tracepoint_action; | |
498 | ||
499 | struct tracepoint_action_ops | |
500 | { | |
501 | /* Download tracepoint action ACTION to IPA. Return the address of action | |
502 | in IPA/inferior. */ | |
503 | CORE_ADDR (*download) (const struct tracepoint_action *action); | |
42476b70 YQ |
504 | |
505 | /* Send ACTION to agent via command buffer started from BUFFER. Return | |
506 | updated head of command buffer. */ | |
507 | char* (*send) (char *buffer, const struct tracepoint_action *action); | |
8d0d92cd YQ |
508 | }; |
509 | ||
219f2f23 PA |
510 | /* Base action. Concrete actions inherit this. */ |
511 | ||
512 | struct tracepoint_action | |
513 | { | |
8d0d92cd YQ |
514 | #ifndef IN_PROCESS_AGENT |
515 | const struct tracepoint_action_ops *ops; | |
516 | #endif | |
219f2f23 PA |
517 | char type; |
518 | }; | |
519 | ||
520 | /* An 'M' (collect memory) action. */ | |
521 | struct collect_memory_action | |
522 | { | |
523 | struct tracepoint_action base; | |
524 | ||
525 | ULONGEST addr; | |
526 | ULONGEST len; | |
5f18041e | 527 | int32_t basereg; |
219f2f23 PA |
528 | }; |
529 | ||
530 | /* An 'R' (collect registers) action. */ | |
531 | ||
532 | struct collect_registers_action | |
533 | { | |
534 | struct tracepoint_action base; | |
535 | }; | |
536 | ||
537 | /* An 'X' (evaluate expression) action. */ | |
538 | ||
539 | struct eval_expr_action | |
540 | { | |
541 | struct tracepoint_action base; | |
542 | ||
543 | struct agent_expr *expr; | |
544 | }; | |
545 | ||
0fb4aa4b PA |
546 | /* An 'L' (collect static trace data) action. */ |
547 | struct collect_static_trace_data_action | |
548 | { | |
549 | struct tracepoint_action base; | |
550 | }; | |
551 | ||
8d0d92cd YQ |
552 | #ifndef IN_PROCESS_AGENT |
553 | static CORE_ADDR | |
554 | m_tracepoint_action_download (const struct tracepoint_action *action) | |
555 | { | |
556 | int size_in_ipa = (sizeof (struct collect_memory_action) | |
557 | - offsetof (struct tracepoint_action, type)); | |
558 | CORE_ADDR ipa_action = target_malloc (size_in_ipa); | |
559 | ||
560 | write_inferior_memory (ipa_action, (unsigned char *) &action->type, | |
561 | size_in_ipa); | |
562 | ||
563 | return ipa_action; | |
564 | } | |
42476b70 YQ |
565 | static char * |
566 | m_tracepoint_action_send (char *buffer, const struct tracepoint_action *action) | |
567 | { | |
568 | struct collect_memory_action *maction | |
569 | = (struct collect_memory_action *) action; | |
570 | ||
571 | COPY_FIELD_TO_BUF (buffer, maction, addr); | |
572 | COPY_FIELD_TO_BUF (buffer, maction, len); | |
573 | COPY_FIELD_TO_BUF (buffer, maction, basereg); | |
574 | ||
575 | return buffer; | |
576 | } | |
8d0d92cd YQ |
577 | |
578 | static const struct tracepoint_action_ops m_tracepoint_action_ops = | |
579 | { | |
580 | m_tracepoint_action_download, | |
42476b70 | 581 | m_tracepoint_action_send, |
8d0d92cd YQ |
582 | }; |
583 | ||
584 | static CORE_ADDR | |
585 | r_tracepoint_action_download (const struct tracepoint_action *action) | |
586 | { | |
587 | int size_in_ipa = (sizeof (struct collect_registers_action) | |
588 | - offsetof (struct tracepoint_action, type)); | |
589 | CORE_ADDR ipa_action = target_malloc (size_in_ipa); | |
590 | ||
591 | write_inferior_memory (ipa_action, (unsigned char *) &action->type, | |
592 | size_in_ipa); | |
593 | ||
594 | return ipa_action; | |
595 | } | |
596 | ||
42476b70 YQ |
597 | static char * |
598 | r_tracepoint_action_send (char *buffer, const struct tracepoint_action *action) | |
599 | { | |
600 | return buffer; | |
601 | } | |
602 | ||
8d0d92cd YQ |
603 | static const struct tracepoint_action_ops r_tracepoint_action_ops = |
604 | { | |
605 | r_tracepoint_action_download, | |
42476b70 | 606 | r_tracepoint_action_send, |
8d0d92cd YQ |
607 | }; |
608 | ||
609 | static CORE_ADDR download_agent_expr (struct agent_expr *expr); | |
610 | ||
611 | static CORE_ADDR | |
612 | x_tracepoint_action_download (const struct tracepoint_action *action) | |
613 | { | |
614 | int size_in_ipa = (sizeof (struct eval_expr_action) | |
615 | - offsetof (struct tracepoint_action, type)); | |
616 | CORE_ADDR ipa_action = target_malloc (size_in_ipa); | |
617 | CORE_ADDR expr; | |
618 | ||
619 | write_inferior_memory (ipa_action, (unsigned char *) &action->type, | |
620 | size_in_ipa); | |
621 | expr = download_agent_expr (((struct eval_expr_action *)action)->expr); | |
622 | write_inferior_data_ptr (ipa_action + offsetof (struct eval_expr_action, expr) | |
623 | - offsetof (struct tracepoint_action, type), | |
624 | expr); | |
625 | ||
626 | return ipa_action; | |
627 | } | |
628 | ||
42476b70 YQ |
629 | /* Copy agent expression AEXPR to buffer pointed by P. If AEXPR is NULL, |
630 | copy 0 to P. Return updated header of buffer. */ | |
631 | ||
632 | static char * | |
633 | agent_expr_send (char *p, const struct agent_expr *aexpr) | |
634 | { | |
635 | /* Copy the length of condition first, and then copy its | |
636 | content. */ | |
637 | if (aexpr == NULL) | |
638 | { | |
639 | memset (p, 0, 4); | |
640 | p += 4; | |
641 | } | |
642 | else | |
643 | { | |
644 | memcpy (p, &aexpr->length, 4); | |
645 | p +=4; | |
646 | ||
647 | memcpy (p, aexpr->bytes, aexpr->length); | |
648 | p += aexpr->length; | |
649 | } | |
650 | return p; | |
651 | } | |
652 | ||
653 | static char * | |
654 | x_tracepoint_action_send ( char *buffer, const struct tracepoint_action *action) | |
655 | { | |
656 | struct eval_expr_action *eaction = (struct eval_expr_action *) action; | |
657 | ||
658 | return agent_expr_send (buffer, eaction->expr); | |
659 | } | |
660 | ||
8d0d92cd YQ |
661 | static const struct tracepoint_action_ops x_tracepoint_action_ops = |
662 | { | |
663 | x_tracepoint_action_download, | |
42476b70 | 664 | x_tracepoint_action_send, |
8d0d92cd YQ |
665 | }; |
666 | ||
667 | static CORE_ADDR | |
668 | l_tracepoint_action_download (const struct tracepoint_action *action) | |
669 | { | |
670 | int size_in_ipa = (sizeof (struct collect_static_trace_data_action) | |
671 | - offsetof (struct tracepoint_action, type)); | |
672 | CORE_ADDR ipa_action = target_malloc (size_in_ipa); | |
673 | ||
674 | write_inferior_memory (ipa_action, (unsigned char *) &action->type, | |
675 | size_in_ipa); | |
676 | ||
677 | return ipa_action; | |
678 | } | |
679 | ||
42476b70 YQ |
680 | static char * |
681 | l_tracepoint_action_send (char *buffer, const struct tracepoint_action *action) | |
682 | { | |
683 | return buffer; | |
684 | } | |
685 | ||
8d0d92cd YQ |
686 | static const struct tracepoint_action_ops l_tracepoint_action_ops = |
687 | { | |
688 | l_tracepoint_action_download, | |
42476b70 | 689 | l_tracepoint_action_send, |
8d0d92cd YQ |
690 | }; |
691 | #endif | |
692 | ||
219f2f23 PA |
693 | /* This structure describes a piece of the source-level definition of |
694 | the tracepoint. The contents are not interpreted by the target, | |
695 | but preserved verbatim for uploading upon reconnection. */ | |
696 | ||
697 | struct source_string | |
698 | { | |
699 | /* The type of string, such as "cond" for a conditional. */ | |
700 | char *type; | |
701 | ||
702 | /* The source-level string itself. For the sake of target | |
703 | debugging, we store it in plaintext, even though it is always | |
704 | transmitted in hex. */ | |
705 | char *str; | |
706 | ||
707 | /* Link to the next one in the list. We link them in the order | |
708 | received, in case some make up an ordered list of commands or | |
709 | some such. */ | |
710 | struct source_string *next; | |
711 | }; | |
712 | ||
fa593d66 PA |
713 | enum tracepoint_type |
714 | { | |
715 | /* Trap based tracepoint. */ | |
716 | trap_tracepoint, | |
717 | ||
718 | /* A fast tracepoint implemented with a jump instead of a trap. */ | |
719 | fast_tracepoint, | |
0fb4aa4b PA |
720 | |
721 | /* A static tracepoint, implemented by a program call into a tracing | |
722 | library. */ | |
723 | static_tracepoint | |
fa593d66 PA |
724 | }; |
725 | ||
219f2f23 PA |
726 | struct tracepoint_hit_ctx; |
727 | ||
6a271cae PA |
728 | typedef enum eval_result_type (*condfn) (struct tracepoint_hit_ctx *, |
729 | ULONGEST *); | |
730 | ||
219f2f23 PA |
731 | /* The definition of a tracepoint. */ |
732 | ||
733 | /* Tracepoints may have multiple locations, each at a different | |
734 | address. This can occur with optimizations, template | |
735 | instantiation, etc. Since the locations may be in different | |
736 | scopes, the conditions and actions may be different for each | |
737 | location. Our target version of tracepoints is more like GDB's | |
738 | notion of "breakpoint locations", but we have almost nothing that | |
739 | is not per-location, so we bother having two kinds of objects. The | |
740 | key consequence is that numbers are not unique, and that it takes | |
741 | both number and address to identify a tracepoint uniquely. */ | |
742 | ||
743 | struct tracepoint | |
744 | { | |
745 | /* The number of the tracepoint, as specified by GDB. Several | |
746 | tracepoint objects here may share a number. */ | |
5f18041e | 747 | uint32_t number; |
219f2f23 PA |
748 | |
749 | /* Address at which the tracepoint is supposed to trigger. Several | |
750 | tracepoints may share an address. */ | |
751 | CORE_ADDR address; | |
752 | ||
fa593d66 PA |
753 | /* Tracepoint type. */ |
754 | enum tracepoint_type type; | |
755 | ||
219f2f23 | 756 | /* True if the tracepoint is currently enabled. */ |
5f18041e | 757 | int8_t enabled; |
219f2f23 PA |
758 | |
759 | /* The number of single steps that will be performed after each | |
760 | tracepoint hit. */ | |
5f18041e | 761 | uint64_t step_count; |
219f2f23 PA |
762 | |
763 | /* The number of times the tracepoint may be hit before it will | |
764 | terminate the entire tracing run. */ | |
5f18041e | 765 | uint64_t pass_count; |
219f2f23 PA |
766 | |
767 | /* Pointer to the agent expression that is the tracepoint's | |
768 | conditional, or NULL if the tracepoint is unconditional. */ | |
769 | struct agent_expr *cond; | |
770 | ||
771 | /* The list of actions to take when the tracepoint triggers. */ | |
5f18041e | 772 | uint32_t numactions; |
219f2f23 | 773 | struct tracepoint_action **actions; |
219f2f23 PA |
774 | |
775 | /* Count of the times we've hit this tracepoint during the run. | |
776 | Note that while-stepping steps are not counted as "hits". */ | |
5f18041e | 777 | uint64_t hit_count; |
219f2f23 | 778 | |
f196051f | 779 | /* Cached sum of the sizes of traceframes created by this point. */ |
5f18041e | 780 | uint64_t traceframe_usage; |
f196051f | 781 | |
6a271cae PA |
782 | CORE_ADDR compiled_cond; |
783 | ||
fa593d66 PA |
784 | /* Link to the next tracepoint in the list. */ |
785 | struct tracepoint *next; | |
786 | ||
787 | #ifndef IN_PROCESS_AGENT | |
788 | /* The list of actions to take when the tracepoint triggers, in | |
789 | string/packet form. */ | |
790 | char **actions_str; | |
791 | ||
219f2f23 PA |
792 | /* The collection of strings that describe the tracepoint as it was |
793 | entered into GDB. These are not used by the target, but are | |
794 | reported back to GDB upon reconnection. */ | |
795 | struct source_string *source_strings; | |
796 | ||
fa593d66 PA |
797 | /* The number of bytes displaced by fast tracepoints. It may subsume |
798 | multiple instructions, for multi-byte fast tracepoints. This | |
799 | field is only valid for fast tracepoints. */ | |
5f18041e | 800 | uint32_t orig_size; |
fa593d66 PA |
801 | |
802 | /* Only for fast tracepoints. */ | |
803 | CORE_ADDR obj_addr_on_target; | |
804 | ||
805 | /* Address range where the original instruction under a fast | |
806 | tracepoint was relocated to. (_end is actually one byte past | |
807 | the end). */ | |
808 | CORE_ADDR adjusted_insn_addr; | |
809 | CORE_ADDR adjusted_insn_addr_end; | |
810 | ||
811 | /* The address range of the piece of the jump pad buffer that was | |
812 | assigned to this fast tracepoint. (_end is actually one byte | |
813 | past the end).*/ | |
814 | CORE_ADDR jump_pad; | |
815 | CORE_ADDR jump_pad_end; | |
816 | ||
405f8e94 SS |
817 | /* The address range of the piece of the trampoline buffer that was |
818 | assigned to this fast tracepoint. (_end is actually one byte | |
819 | past the end). */ | |
820 | CORE_ADDR trampoline; | |
821 | CORE_ADDR trampoline_end; | |
822 | ||
fa593d66 PA |
823 | /* The list of actions to take while in a stepping loop. These |
824 | fields are only valid for patch-based tracepoints. */ | |
825 | int num_step_actions; | |
826 | struct tracepoint_action **step_actions; | |
827 | /* Same, but in string/packet form. */ | |
828 | char **step_actions_str; | |
829 | ||
830 | /* Handle returned by the breakpoint or tracepoint module when we | |
0fb4aa4b PA |
831 | inserted the trap or jump, or hooked into a static tracepoint. |
832 | NULL if we haven't inserted it yet. */ | |
219f2f23 | 833 | void *handle; |
fa593d66 | 834 | #endif |
219f2f23 | 835 | |
219f2f23 PA |
836 | }; |
837 | ||
fa593d66 PA |
838 | #ifndef IN_PROCESS_AGENT |
839 | ||
219f2f23 PA |
840 | /* Given `while-stepping', a thread may be collecting data for more |
841 | than one tracepoint simultaneously. On the other hand, the same | |
842 | tracepoint with a while-stepping action may be hit by more than one | |
843 | thread simultaneously (but not quite, each thread could be handling | |
844 | a different step). Each thread holds a list of these objects, | |
845 | representing the current step of each while-stepping action being | |
846 | collected. */ | |
847 | ||
848 | struct wstep_state | |
849 | { | |
850 | struct wstep_state *next; | |
851 | ||
852 | /* The tracepoint number. */ | |
853 | int tp_number; | |
854 | /* The tracepoint's address. */ | |
855 | CORE_ADDR tp_address; | |
856 | ||
857 | /* The number of the current step in this 'while-stepping' | |
858 | action. */ | |
859 | long current_step; | |
860 | }; | |
861 | ||
fa593d66 PA |
862 | #endif |
863 | ||
864 | /* The linked list of all tracepoints. Marked explicitly as used as | |
865 | the in-process library doesn't use it for the fast tracepoints | |
866 | support. */ | |
867 | IP_AGENT_EXPORT struct tracepoint *tracepoints ATTR_USED; | |
219f2f23 | 868 | |
fa593d66 | 869 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
870 | |
871 | /* Pointer to the last tracepoint in the list, new tracepoints are | |
872 | linked in at the end. */ | |
873 | ||
874 | static struct tracepoint *last_tracepoint; | |
fa593d66 | 875 | #endif |
219f2f23 PA |
876 | |
877 | /* The first tracepoint to exceed its pass count. */ | |
878 | ||
fa593d66 | 879 | IP_AGENT_EXPORT struct tracepoint *stopping_tracepoint; |
219f2f23 PA |
880 | |
881 | /* True if the trace buffer is full or otherwise no longer usable. */ | |
882 | ||
fa593d66 | 883 | IP_AGENT_EXPORT int trace_buffer_is_full; |
219f2f23 | 884 | |
219f2f23 PA |
885 | static enum eval_result_type expr_eval_result = expr_eval_no_error; |
886 | ||
fa593d66 PA |
887 | #ifndef IN_PROCESS_AGENT |
888 | ||
219f2f23 PA |
889 | static const char *eval_result_names[] = |
890 | { | |
891 | "terror:in the attic", /* this should never be reported */ | |
892 | "terror:empty expression", | |
893 | "terror:empty stack", | |
894 | "terror:stack overflow", | |
895 | "terror:stack underflow", | |
896 | "terror:unhandled opcode", | |
897 | "terror:unrecognized opcode", | |
898 | "terror:divide by zero" | |
899 | }; | |
900 | ||
fa593d66 PA |
901 | #endif |
902 | ||
219f2f23 PA |
903 | /* The tracepoint in which the error occurred. */ |
904 | ||
905 | static struct tracepoint *error_tracepoint; | |
906 | ||
907 | struct trace_state_variable | |
908 | { | |
909 | /* This is the name of the variable as used in GDB. The target | |
910 | doesn't use the name, but needs to have it for saving and | |
911 | reconnection purposes. */ | |
912 | char *name; | |
913 | ||
914 | /* This number identifies the variable uniquely. Numbers may be | |
915 | assigned either by the target (in the case of builtin variables), | |
916 | or by GDB, and are presumed unique during the course of a trace | |
917 | experiment. */ | |
918 | int number; | |
919 | ||
920 | /* The variable's initial value, a 64-bit signed integer always. */ | |
921 | LONGEST initial_value; | |
922 | ||
923 | /* The variable's value, a 64-bit signed integer always. */ | |
924 | LONGEST value; | |
925 | ||
926 | /* Pointer to a getter function, used to supply computed values. */ | |
927 | LONGEST (*getter) (void); | |
928 | ||
929 | /* Link to the next variable. */ | |
930 | struct trace_state_variable *next; | |
931 | }; | |
932 | ||
933 | /* Linked list of all trace state variables. */ | |
934 | ||
fa593d66 PA |
935 | #ifdef IN_PROCESS_AGENT |
936 | struct trace_state_variable *alloced_trace_state_variables; | |
937 | #endif | |
938 | ||
939 | IP_AGENT_EXPORT struct trace_state_variable *trace_state_variables; | |
219f2f23 PA |
940 | |
941 | /* The results of tracing go into a fixed-size space known as the | |
942 | "trace buffer". Because usage follows a limited number of | |
943 | patterns, we manage it ourselves rather than with malloc. Basic | |
944 | rules are that we create only one trace frame at a time, each is | |
945 | variable in size, they are never moved once created, and we only | |
946 | discard if we are doing a circular buffer, and then only the oldest | |
947 | ones. Each trace frame includes its own size, so we don't need to | |
948 | link them together, and the trace frame number is relative to the | |
949 | first one, so we don't need to record numbers. A trace frame also | |
950 | records the number of the tracepoint that created it. The data | |
951 | itself is a series of blocks, each introduced by a single character | |
952 | and with a defined format. Each type of block has enough | |
953 | type/length info to allow scanners to jump quickly from one block | |
954 | to the next without reading each byte in the block. */ | |
955 | ||
956 | /* Trace buffer management would be simple - advance a free pointer | |
957 | from beginning to end, then stop - were it not for the circular | |
958 | buffer option, which is a useful way to prevent a trace run from | |
959 | stopping prematurely because the buffer filled up. In the circular | |
960 | case, the location of the first trace frame (trace_buffer_start) | |
961 | moves as old trace frames are discarded. Also, since we grow trace | |
962 | frames incrementally as actions are performed, we wrap around to | |
963 | the beginning of the trace buffer. This is per-block, so each | |
964 | block within a trace frame remains contiguous. Things get messy | |
965 | when the wrapped-around trace frame is the one being discarded; the | |
966 | free space ends up in two parts at opposite ends of the buffer. */ | |
967 | ||
968 | #ifndef ATTR_PACKED | |
969 | # if defined(__GNUC__) | |
970 | # define ATTR_PACKED __attribute__ ((packed)) | |
971 | # else | |
972 | # define ATTR_PACKED /* nothing */ | |
973 | # endif | |
974 | #endif | |
975 | ||
976 | /* The data collected at a tracepoint hit. This object should be as | |
977 | small as possible, since there may be a great many of them. We do | |
978 | not need to keep a frame number, because they are all sequential | |
979 | and there are no deletions; so the Nth frame in the buffer is | |
980 | always frame number N. */ | |
981 | ||
982 | struct traceframe | |
983 | { | |
984 | /* Number of the tracepoint that collected this traceframe. A value | |
985 | of 0 indicates the current end of the trace buffer. We make this | |
986 | a 16-bit field because it's never going to happen that GDB's | |
987 | numbering of tracepoints reaches 32,000. */ | |
988 | int tpnum : 16; | |
989 | ||
990 | /* The size of the data in this trace frame. We limit this to 32 | |
991 | bits, even on a 64-bit target, because it's just implausible that | |
992 | one is validly going to collect 4 gigabytes of data at a single | |
993 | tracepoint hit. */ | |
994 | unsigned int data_size : 32; | |
995 | ||
996 | /* The base of the trace data, which is contiguous from this point. */ | |
997 | unsigned char data[0]; | |
998 | ||
fa593d66 | 999 | } ATTR_PACKED; |
219f2f23 | 1000 | |
3aafd2ff PA |
1001 | /* The size of the EOB marker, in bytes. A traceframe with zeroed |
1002 | fields (and no data) marks the end of trace data. */ | |
1003 | #define TRACEFRAME_EOB_MARKER_SIZE offsetof (struct traceframe, data) | |
1004 | ||
219f2f23 PA |
1005 | /* The traceframe to be used as the source of data to send back to |
1006 | GDB. A value of -1 means to get data from the live program. */ | |
1007 | ||
1008 | int current_traceframe = -1; | |
1009 | ||
1010 | /* This flag is true if the trace buffer is circular, meaning that | |
1011 | when it fills, the oldest trace frames are discarded in order to | |
1012 | make room. */ | |
1013 | ||
fa593d66 | 1014 | #ifndef IN_PROCESS_AGENT |
219f2f23 | 1015 | static int circular_trace_buffer; |
fa593d66 | 1016 | #endif |
219f2f23 | 1017 | |
f6f899bf HAQ |
1018 | /* Size of the trace buffer. */ |
1019 | ||
1020 | static LONGEST trace_buffer_size; | |
1021 | ||
219f2f23 PA |
1022 | /* Pointer to the block of memory that traceframes all go into. */ |
1023 | ||
1024 | static unsigned char *trace_buffer_lo; | |
1025 | ||
1026 | /* Pointer to the end of the trace buffer, more precisely to the byte | |
1027 | after the end of the buffer. */ | |
1028 | ||
1029 | static unsigned char *trace_buffer_hi; | |
1030 | ||
fa593d66 PA |
1031 | /* Control structure holding the read/write/etc. pointers into the |
1032 | trace buffer. We need more than one of these to implement a | |
1033 | transaction-like mechanism to garantees that both GDBserver and the | |
1034 | in-process agent can try to change the trace buffer | |
1035 | simultaneously. */ | |
1036 | ||
1037 | struct trace_buffer_control | |
1038 | { | |
1039 | /* Pointer to the first trace frame in the buffer. In the | |
1040 | non-circular case, this is equal to trace_buffer_lo, otherwise it | |
1041 | moves around in the buffer. */ | |
1042 | unsigned char *start; | |
1043 | ||
1044 | /* Pointer to the free part of the trace buffer. Note that we clear | |
1045 | several bytes at and after this pointer, so that traceframe | |
1046 | scans/searches terminate properly. */ | |
1047 | unsigned char *free; | |
1048 | ||
1049 | /* Pointer to the byte after the end of the free part. Note that | |
1050 | this may be smaller than trace_buffer_free in the circular case, | |
1051 | and means that the free part is in two pieces. Initially it is | |
1052 | equal to trace_buffer_hi, then is generally equivalent to | |
1053 | trace_buffer_start. */ | |
1054 | unsigned char *end_free; | |
1055 | ||
1056 | /* Pointer to the wraparound. If not equal to trace_buffer_hi, then | |
1057 | this is the point at which the trace data breaks, and resumes at | |
1058 | trace_buffer_lo. */ | |
1059 | unsigned char *wrap; | |
1060 | }; | |
1061 | ||
1062 | /* Same as above, to be used by GDBserver when updating the in-process | |
1063 | agent. */ | |
1064 | struct ipa_trace_buffer_control | |
1065 | { | |
1066 | uintptr_t start; | |
1067 | uintptr_t free; | |
1068 | uintptr_t end_free; | |
1069 | uintptr_t wrap; | |
1070 | }; | |
1071 | ||
1072 | ||
1073 | /* We have possibly both GDBserver and an inferior thread accessing | |
1074 | the same IPA trace buffer memory. The IPA is the producer (tries | |
1075 | to put new frames in the buffer), while GDBserver occasionally | |
1076 | consumes them, that is, flushes the IPA's buffer into its own | |
1077 | buffer. Both sides need to update the trace buffer control | |
1078 | pointers (current head, tail, etc.). We can't use a global lock to | |
1079 | synchronize the accesses, as otherwise we could deadlock GDBserver | |
1080 | (if the thread holding the lock stops for a signal, say). So | |
1081 | instead of that, we use a transaction scheme where GDBserver writes | |
1082 | always prevail over the IPAs writes, and, we have the IPA detect | |
1083 | the commit failure/overwrite, and retry the whole attempt. This is | |
1084 | mainly implemented by having a global token object that represents | |
1085 | who wrote last to the buffer control structure. We need to freeze | |
1086 | any inferior writing to the buffer while GDBserver touches memory, | |
1087 | so that the inferior can correctly detect that GDBserver had been | |
1088 | there, otherwise, it could mistakingly think its commit was | |
1089 | successful; that's implemented by simply having GDBserver set a | |
1090 | breakpoint the inferior hits if it is the critical region. | |
1091 | ||
1092 | There are three cycling trace buffer control structure copies | |
1093 | (buffer head, tail, etc.), with the token object including an index | |
1094 | indicating which is current live copy. The IPA tentatively builds | |
1095 | an updated copy in a non-current control structure, while GDBserver | |
1096 | always clobbers the current version directly. The IPA then tries | |
1097 | to atomically "commit" its version; if GDBserver clobbered the | |
1098 | structure meanwhile, that will fail, and the IPA restarts the | |
1099 | allocation process. | |
1100 | ||
1101 | Listing the step in further detail, we have: | |
1102 | ||
1103 | In-process agent (producer): | |
1104 | ||
1105 | - passes by `about_to_request_buffer_space' breakpoint/lock | |
1106 | ||
1107 | - reads current token, extracts current trace buffer control index, | |
1108 | and starts tentatively updating the rightmost one (0->1, 1->2, | |
1109 | 2->0). Note that only one inferior thread is executing this code | |
1110 | at any given time, due to an outer lock in the jump pads. | |
219f2f23 | 1111 | |
fa593d66 | 1112 | - updates counters, and tries to commit the token. |
219f2f23 | 1113 | |
fa593d66 PA |
1114 | - passes by second `about_to_request_buffer_space' breakpoint/lock, |
1115 | leaving the sync region. | |
219f2f23 | 1116 | |
fa593d66 | 1117 | - checks if the update was effective. |
219f2f23 | 1118 | |
fa593d66 PA |
1119 | - if trace buffer was found full, hits flush_trace_buffer |
1120 | breakpoint, and restarts later afterwards. | |
219f2f23 | 1121 | |
fa593d66 | 1122 | GDBserver (consumer): |
219f2f23 | 1123 | |
fa593d66 PA |
1124 | - sets `about_to_request_buffer_space' breakpoint/lock. |
1125 | ||
1126 | - updates the token unconditionally, using the current buffer | |
1127 | control index, since it knows that the IP agent always writes to | |
1128 | the rightmost, and due to the breakpoint, at most one IP thread | |
1129 | can try to update the trace buffer concurrently to GDBserver, so | |
1130 | there will be no danger of trace buffer control index wrap making | |
1131 | the IPA write to the same index as GDBserver. | |
1132 | ||
1133 | - flushes the IP agent's trace buffer completely, and updates the | |
1134 | current trace buffer control structure. GDBserver *always* wins. | |
1135 | ||
1136 | - removes the `about_to_request_buffer_space' breakpoint. | |
1137 | ||
1138 | The token is stored in the `trace_buffer_ctrl_curr' variable. | |
1139 | Internally, it's bits are defined as: | |
1140 | ||
1141 | |-------------+-----+-------------+--------+-------------+--------------| | |
1142 | | Bit offsets | 31 | 30 - 20 | 19 | 18-8 | 7-0 | | |
1143 | |-------------+-----+-------------+--------+-------------+--------------| | |
1144 | | What | GSB | PC (11-bit) | unused | CC (11-bit) | TBCI (8-bit) | | |
1145 | |-------------+-----+-------------+--------+-------------+--------------| | |
1146 | ||
1147 | GSB - GDBserver Stamp Bit | |
1148 | PC - Previous Counter | |
1149 | CC - Current Counter | |
1150 | TBCI - Trace Buffer Control Index | |
1151 | ||
1152 | ||
1153 | An IPA update of `trace_buffer_ctrl_curr' does: | |
1154 | ||
1155 | - read CC from the current token, save as PC. | |
1156 | - updates pointers | |
1157 | - atomically tries to write PC+1,CC | |
1158 | ||
1159 | A GDBserver update of `trace_buffer_ctrl_curr' does: | |
1160 | ||
1161 | - reads PC and CC from the current token. | |
1162 | - updates pointers | |
1163 | - writes GSB,PC,CC | |
1164 | */ | |
1165 | ||
1166 | /* These are the bits of `trace_buffer_ctrl_curr' that are reserved | |
1167 | for the counters described below. The cleared bits are used to | |
1168 | hold the index of the items of the `trace_buffer_ctrl' array that | |
1169 | is "current". */ | |
1170 | #define GDBSERVER_FLUSH_COUNT_MASK 0xfffffff0 | |
1171 | ||
1172 | /* `trace_buffer_ctrl_curr' contains two counters. The `previous' | |
1173 | counter, and the `current' counter. */ | |
1174 | ||
1175 | #define GDBSERVER_FLUSH_COUNT_MASK_PREV 0x7ff00000 | |
1176 | #define GDBSERVER_FLUSH_COUNT_MASK_CURR 0x0007ff00 | |
1177 | ||
1178 | /* When GDBserver update the IP agent's `trace_buffer_ctrl_curr', it | |
1179 | always stamps this bit as set. */ | |
1180 | #define GDBSERVER_UPDATED_FLUSH_COUNT_BIT 0x80000000 | |
1181 | ||
1182 | #ifdef IN_PROCESS_AGENT | |
1183 | IP_AGENT_EXPORT struct trace_buffer_control trace_buffer_ctrl[3]; | |
1184 | IP_AGENT_EXPORT unsigned int trace_buffer_ctrl_curr; | |
1185 | ||
1186 | # define TRACE_BUFFER_CTRL_CURR \ | |
1187 | (trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK) | |
1188 | ||
1189 | #else | |
1190 | ||
1191 | /* The GDBserver side agent only needs one instance of this object, as | |
1192 | it doesn't need to sync with itself. Define it as array anyway so | |
1193 | that the rest of the code base doesn't need to care for the | |
1194 | difference. */ | |
1195 | struct trace_buffer_control trace_buffer_ctrl[1]; | |
1196 | # define TRACE_BUFFER_CTRL_CURR 0 | |
1197 | #endif | |
1198 | ||
1199 | /* These are convenience macros used to access the current trace | |
1200 | buffer control in effect. */ | |
1201 | #define trace_buffer_start (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].start) | |
1202 | #define trace_buffer_free (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].free) | |
1203 | #define trace_buffer_end_free \ | |
1204 | (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].end_free) | |
1205 | #define trace_buffer_wrap (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].wrap) | |
219f2f23 | 1206 | |
219f2f23 PA |
1207 | |
1208 | /* Macro that returns a pointer to the first traceframe in the buffer. */ | |
1209 | ||
1210 | #define FIRST_TRACEFRAME() ((struct traceframe *) trace_buffer_start) | |
1211 | ||
1212 | /* Macro that returns a pointer to the next traceframe in the buffer. | |
1213 | If the computed location is beyond the wraparound point, subtract | |
1214 | the offset of the wraparound. */ | |
1215 | ||
1216 | #define NEXT_TRACEFRAME_1(TF) \ | |
1217 | (((unsigned char *) (TF)) + sizeof (struct traceframe) + (TF)->data_size) | |
1218 | ||
1219 | #define NEXT_TRACEFRAME(TF) \ | |
1220 | ((struct traceframe *) (NEXT_TRACEFRAME_1 (TF) \ | |
1221 | - ((NEXT_TRACEFRAME_1 (TF) >= trace_buffer_wrap) \ | |
1222 | ? (trace_buffer_wrap - trace_buffer_lo) \ | |
1223 | : 0))) | |
1224 | ||
1225 | /* The difference between these counters represents the total number | |
fa593d66 PA |
1226 | of complete traceframes present in the trace buffer. The IP agent |
1227 | writes to the write count, GDBserver writes to read count. */ | |
219f2f23 | 1228 | |
fa593d66 PA |
1229 | IP_AGENT_EXPORT unsigned int traceframe_write_count; |
1230 | IP_AGENT_EXPORT unsigned int traceframe_read_count; | |
219f2f23 PA |
1231 | |
1232 | /* Convenience macro. */ | |
1233 | ||
1234 | #define traceframe_count \ | |
1235 | ((unsigned int) (traceframe_write_count - traceframe_read_count)) | |
1236 | ||
1237 | /* The count of all traceframes created in the current run, including | |
1238 | ones that were discarded to make room. */ | |
1239 | ||
fa593d66 PA |
1240 | IP_AGENT_EXPORT int traceframes_created; |
1241 | ||
1242 | #ifndef IN_PROCESS_AGENT | |
219f2f23 PA |
1243 | |
1244 | /* Read-only regions are address ranges whose contents don't change, | |
1245 | and so can be read from target memory even while looking at a trace | |
1246 | frame. Without these, disassembly for instance will likely fail, | |
1247 | because the program code is not usually collected into a trace | |
1248 | frame. This data structure does not need to be very complicated or | |
1249 | particularly efficient, it's only going to be used occasionally, | |
1250 | and only by some commands. */ | |
1251 | ||
1252 | struct readonly_region | |
1253 | { | |
1254 | /* The bounds of the region. */ | |
1255 | CORE_ADDR start, end; | |
1256 | ||
1257 | /* Link to the next one. */ | |
1258 | struct readonly_region *next; | |
1259 | }; | |
1260 | ||
1261 | /* Linked list of readonly regions. This list stays in effect from | |
1262 | one tstart to the next. */ | |
1263 | ||
1264 | static struct readonly_region *readonly_regions; | |
1265 | ||
fa593d66 PA |
1266 | #endif |
1267 | ||
219f2f23 PA |
1268 | /* The global that controls tracing overall. */ |
1269 | ||
fa593d66 PA |
1270 | IP_AGENT_EXPORT int tracing; |
1271 | ||
1272 | #ifndef IN_PROCESS_AGENT | |
8336d594 PA |
1273 | |
1274 | /* Controls whether tracing should continue after GDB disconnects. */ | |
1275 | ||
1276 | int disconnected_tracing; | |
219f2f23 PA |
1277 | |
1278 | /* The reason for the last tracing run to have stopped. We initialize | |
1279 | to a distinct string so that GDB can distinguish between "stopped | |
1280 | after running" and "stopped because never run" cases. */ | |
1281 | ||
1282 | static const char *tracing_stop_reason = "tnotrun"; | |
1283 | ||
1284 | static int tracing_stop_tpnum; | |
1285 | ||
f196051f SS |
1286 | /* 64-bit timestamps for the trace run's start and finish, expressed |
1287 | in microseconds from the Unix epoch. */ | |
1288 | ||
1289 | LONGEST tracing_start_time; | |
1290 | LONGEST tracing_stop_time; | |
1291 | ||
1292 | /* The (optional) user-supplied name of the user that started the run. | |
1293 | This is an arbitrary string, and may be NULL. */ | |
1294 | ||
1295 | char *tracing_user_name; | |
1296 | ||
1297 | /* Optional user-supplied text describing the run. This is | |
1298 | an arbitrary string, and may be NULL. */ | |
1299 | ||
1300 | char *tracing_notes; | |
1301 | ||
1302 | /* Optional user-supplied text explaining a tstop command. This is an | |
1303 | arbitrary string, and may be NULL. */ | |
1304 | ||
1305 | char *tracing_stop_note; | |
1306 | ||
fa593d66 PA |
1307 | #endif |
1308 | ||
219f2f23 PA |
1309 | /* Functions local to this file. */ |
1310 | ||
1311 | /* Base "class" for tracepoint type specific data to be passed down to | |
fa593d66 | 1312 | collect_data_at_tracepoint. */ |
219f2f23 PA |
1313 | struct tracepoint_hit_ctx |
1314 | { | |
fa593d66 | 1315 | enum tracepoint_type type; |
219f2f23 PA |
1316 | }; |
1317 | ||
fa593d66 PA |
1318 | #ifdef IN_PROCESS_AGENT |
1319 | ||
1320 | /* Fast/jump tracepoint specific data to be passed down to | |
219f2f23 | 1321 | collect_data_at_tracepoint. */ |
fa593d66 PA |
1322 | struct fast_tracepoint_ctx |
1323 | { | |
1324 | struct tracepoint_hit_ctx base; | |
1325 | ||
1326 | struct regcache regcache; | |
1327 | int regcache_initted; | |
1328 | unsigned char *regspace; | |
1329 | ||
1330 | unsigned char *regs; | |
1331 | struct tracepoint *tpoint; | |
1332 | }; | |
219f2f23 | 1333 | |
0fb4aa4b PA |
1334 | /* Static tracepoint specific data to be passed down to |
1335 | collect_data_at_tracepoint. */ | |
1336 | struct static_tracepoint_ctx | |
1337 | { | |
1338 | struct tracepoint_hit_ctx base; | |
1339 | ||
1340 | /* The regcache corresponding to the registers state at the time of | |
1341 | the tracepoint hit. Initialized lazily, from REGS. */ | |
1342 | struct regcache regcache; | |
1343 | int regcache_initted; | |
1344 | ||
1345 | /* The buffer space REGCACHE above uses. We use a separate buffer | |
1346 | instead of letting the regcache malloc for both signal safety and | |
1347 | performance reasons; this is allocated on the stack instead. */ | |
1348 | unsigned char *regspace; | |
1349 | ||
1350 | /* The register buffer as passed on by lttng/ust. */ | |
1351 | struct registers *regs; | |
1352 | ||
1353 | /* The "printf" formatter and the args the user passed to the marker | |
1354 | call. We use this to be able to collect "static trace data" | |
1355 | ($_sdata). */ | |
1356 | const char *fmt; | |
1357 | va_list *args; | |
1358 | ||
1359 | /* The GDB tracepoint matching the probed marker that was "hit". */ | |
1360 | struct tracepoint *tpoint; | |
1361 | }; | |
1362 | ||
fa593d66 PA |
1363 | #else |
1364 | ||
1365 | /* Static tracepoint specific data to be passed down to | |
1366 | collect_data_at_tracepoint. */ | |
219f2f23 PA |
1367 | struct trap_tracepoint_ctx |
1368 | { | |
1369 | struct tracepoint_hit_ctx base; | |
1370 | ||
1371 | struct regcache *regcache; | |
1372 | }; | |
1373 | ||
fa593d66 PA |
1374 | #endif |
1375 | ||
fa593d66 | 1376 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1377 | static CORE_ADDR traceframe_get_pc (struct traceframe *tframe); |
1378 | static int traceframe_read_tsv (int num, LONGEST *val); | |
fa593d66 | 1379 | #endif |
219f2f23 PA |
1380 | |
1381 | static int condition_true_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
1382 | struct tracepoint *tpoint); | |
1383 | ||
fa593d66 | 1384 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1385 | static void clear_readonly_regions (void); |
1386 | static void clear_installed_tracepoints (void); | |
fa593d66 | 1387 | #endif |
219f2f23 PA |
1388 | |
1389 | static void collect_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
1390 | CORE_ADDR stop_pc, | |
1391 | struct tracepoint *tpoint); | |
fa593d66 | 1392 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1393 | static void collect_data_at_step (struct tracepoint_hit_ctx *ctx, |
1394 | CORE_ADDR stop_pc, | |
1395 | struct tracepoint *tpoint, int current_step); | |
6a271cae PA |
1396 | static void compile_tracepoint_condition (struct tracepoint *tpoint, |
1397 | CORE_ADDR *jump_entry); | |
fa593d66 | 1398 | #endif |
219f2f23 PA |
1399 | static void do_action_at_tracepoint (struct tracepoint_hit_ctx *ctx, |
1400 | CORE_ADDR stop_pc, | |
1401 | struct tracepoint *tpoint, | |
1402 | struct traceframe *tframe, | |
1403 | struct tracepoint_action *taction); | |
1404 | ||
fa593d66 PA |
1405 | #ifndef IN_PROCESS_AGENT |
1406 | static struct tracepoint *fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR); | |
1e4d1764 YQ |
1407 | |
1408 | static void install_tracepoint (struct tracepoint *, char *own_buf); | |
1409 | static void download_tracepoint (struct tracepoint *); | |
405f8e94 | 1410 | static int install_fast_tracepoint (struct tracepoint *, char *errbuf); |
fc3e5175 YQ |
1411 | static void clone_fast_tracepoint (struct tracepoint *to, |
1412 | const struct tracepoint *from); | |
fa593d66 PA |
1413 | #endif |
1414 | ||
f196051f SS |
1415 | static LONGEST get_timestamp (void); |
1416 | ||
fa593d66 PA |
1417 | #if defined(__GNUC__) |
1418 | # define memory_barrier() asm volatile ("" : : : "memory") | |
1419 | #else | |
1420 | # define memory_barrier() do {} while (0) | |
1421 | #endif | |
1422 | ||
1423 | /* We only build the IPA if this builtin is supported, and there are | |
1424 | no uses of this in GDBserver itself, so we're safe in defining this | |
1425 | unconditionally. */ | |
1426 | #define cmpxchg(mem, oldval, newval) \ | |
1427 | __sync_val_compare_and_swap (mem, oldval, newval) | |
1428 | ||
219f2f23 PA |
1429 | /* Record that an error occurred during expression evaluation. */ |
1430 | ||
1431 | static void | |
1432 | record_tracepoint_error (struct tracepoint *tpoint, const char *which, | |
1433 | enum eval_result_type rtype) | |
1434 | { | |
1435 | trace_debug ("Tracepoint %d at %s %s eval reports error %d", | |
1436 | tpoint->number, paddress (tpoint->address), which, rtype); | |
1437 | ||
fa593d66 PA |
1438 | #ifdef IN_PROCESS_AGENT |
1439 | /* Only record the first error we get. */ | |
1440 | if (cmpxchg (&expr_eval_result, | |
1441 | expr_eval_no_error, | |
1442 | rtype) != expr_eval_no_error) | |
1443 | return; | |
1444 | #else | |
1445 | if (expr_eval_result != expr_eval_no_error) | |
1446 | return; | |
1447 | #endif | |
1448 | ||
219f2f23 PA |
1449 | error_tracepoint = tpoint; |
1450 | } | |
1451 | ||
1452 | /* Trace buffer management. */ | |
1453 | ||
1454 | static void | |
1455 | clear_trace_buffer (void) | |
1456 | { | |
1457 | trace_buffer_start = trace_buffer_lo; | |
1458 | trace_buffer_free = trace_buffer_lo; | |
1459 | trace_buffer_end_free = trace_buffer_hi; | |
1460 | trace_buffer_wrap = trace_buffer_hi; | |
1461 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1462 | ((struct traceframe *) trace_buffer_free)->tpnum = 0; | |
1463 | ((struct traceframe *) trace_buffer_free)->data_size = 0; | |
1464 | traceframe_read_count = traceframe_write_count = 0; | |
1465 | traceframes_created = 0; | |
1466 | } | |
1467 | ||
fa593d66 PA |
1468 | #ifndef IN_PROCESS_AGENT |
1469 | ||
1470 | static void | |
1471 | clear_inferior_trace_buffer (void) | |
1472 | { | |
1473 | CORE_ADDR ipa_trace_buffer_lo; | |
1474 | CORE_ADDR ipa_trace_buffer_hi; | |
1475 | struct traceframe ipa_traceframe = { 0 }; | |
1476 | struct ipa_trace_buffer_control ipa_trace_buffer_ctrl; | |
1477 | ||
1478 | read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_lo, | |
1479 | &ipa_trace_buffer_lo); | |
1480 | read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_hi, | |
1481 | &ipa_trace_buffer_hi); | |
1482 | ||
1483 | ipa_trace_buffer_ctrl.start = ipa_trace_buffer_lo; | |
1484 | ipa_trace_buffer_ctrl.free = ipa_trace_buffer_lo; | |
1485 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_hi; | |
1486 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
1487 | ||
1488 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1489 | write_inferior_memory (ipa_sym_addrs.addr_trace_buffer_ctrl, | |
1490 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
1491 | sizeof (ipa_trace_buffer_ctrl)); | |
1492 | ||
1493 | write_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, 0); | |
1494 | ||
1495 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1496 | write_inferior_memory (ipa_trace_buffer_lo, | |
1497 | (unsigned char *) &ipa_traceframe, | |
1498 | sizeof (ipa_traceframe)); | |
1499 | ||
1500 | write_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, 0); | |
1501 | write_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, 0); | |
1502 | write_inferior_integer (ipa_sym_addrs.addr_traceframes_created, 0); | |
1503 | } | |
1504 | ||
1505 | #endif | |
1506 | ||
219f2f23 | 1507 | static void |
f6f899bf | 1508 | init_trace_buffer (LONGEST bufsize) |
219f2f23 | 1509 | { |
3aafd2ff PA |
1510 | size_t alloc_size; |
1511 | ||
f6f899bf HAQ |
1512 | trace_buffer_size = bufsize; |
1513 | ||
3aafd2ff PA |
1514 | /* Make sure to internally allocate at least space for the EOB |
1515 | marker. */ | |
1516 | alloc_size = (bufsize < TRACEFRAME_EOB_MARKER_SIZE | |
1517 | ? TRACEFRAME_EOB_MARKER_SIZE : bufsize); | |
1518 | trace_buffer_lo = xrealloc (trace_buffer_lo, alloc_size); | |
f6f899bf | 1519 | |
3aafd2ff | 1520 | trace_buffer_hi = trace_buffer_lo + trace_buffer_size; |
219f2f23 PA |
1521 | |
1522 | clear_trace_buffer (); | |
1523 | } | |
1524 | ||
fa593d66 PA |
1525 | #ifdef IN_PROCESS_AGENT |
1526 | ||
1527 | IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE | |
1528 | about_to_request_buffer_space (void) | |
1529 | { | |
1530 | /* GDBserver places breakpoint here while it goes about to flush | |
1531 | data at random times. */ | |
1532 | UNKNOWN_SIDE_EFFECTS(); | |
1533 | } | |
1534 | ||
1535 | #endif | |
1536 | ||
219f2f23 PA |
1537 | /* Carve out a piece of the trace buffer, returning NULL in case of |
1538 | failure. */ | |
1539 | ||
1540 | static void * | |
1541 | trace_buffer_alloc (size_t amt) | |
1542 | { | |
1543 | unsigned char *rslt; | |
fa593d66 PA |
1544 | struct trace_buffer_control *tbctrl; |
1545 | unsigned int curr; | |
1546 | #ifdef IN_PROCESS_AGENT | |
1547 | unsigned int prev, prev_filtered; | |
1548 | unsigned int commit_count; | |
1549 | unsigned int commit; | |
1550 | unsigned int readout; | |
1551 | #else | |
219f2f23 PA |
1552 | struct traceframe *oldest; |
1553 | unsigned char *new_start; | |
fa593d66 | 1554 | #endif |
219f2f23 PA |
1555 | |
1556 | trace_debug ("Want to allocate %ld+%ld bytes in trace buffer", | |
1557 | (long) amt, (long) sizeof (struct traceframe)); | |
1558 | ||
1559 | /* Account for the EOB marker. */ | |
3aafd2ff | 1560 | amt += TRACEFRAME_EOB_MARKER_SIZE; |
219f2f23 | 1561 | |
fa593d66 PA |
1562 | #ifdef IN_PROCESS_AGENT |
1563 | again: | |
1564 | memory_barrier (); | |
1565 | ||
1566 | /* Read the current token and extract the index to try to write to, | |
1567 | storing it in CURR. */ | |
1568 | prev = trace_buffer_ctrl_curr; | |
1569 | prev_filtered = prev & ~GDBSERVER_FLUSH_COUNT_MASK; | |
1570 | curr = prev_filtered + 1; | |
1571 | if (curr > 2) | |
1572 | curr = 0; | |
1573 | ||
1574 | about_to_request_buffer_space (); | |
1575 | ||
1576 | /* Start out with a copy of the current state. GDBserver may be | |
1577 | midway writing to the PREV_FILTERED TBC, but, that's OK, we won't | |
1578 | be able to commit anyway if that happens. */ | |
1579 | trace_buffer_ctrl[curr] | |
1580 | = trace_buffer_ctrl[prev_filtered]; | |
1581 | trace_debug ("trying curr=%u", curr); | |
1582 | #else | |
1583 | /* The GDBserver's agent doesn't need all that syncing, and always | |
1584 | updates TCB 0 (there's only one, mind you). */ | |
1585 | curr = 0; | |
1586 | #endif | |
1587 | tbctrl = &trace_buffer_ctrl[curr]; | |
1588 | ||
219f2f23 PA |
1589 | /* Offsets are easier to grok for debugging than raw addresses, |
1590 | especially for the small trace buffer sizes that are useful for | |
1591 | testing. */ | |
fa593d66 PA |
1592 | trace_debug ("Trace buffer [%d] start=%d free=%d endfree=%d wrap=%d hi=%d", |
1593 | curr, | |
1594 | (int) (tbctrl->start - trace_buffer_lo), | |
1595 | (int) (tbctrl->free - trace_buffer_lo), | |
1596 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1597 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1598 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1599 | ||
1600 | /* The algorithm here is to keep trying to get a contiguous block of | |
1601 | the requested size, possibly discarding older traceframes to free | |
1602 | up space. Since free space might come in one or two pieces, | |
1603 | depending on whether discarded traceframes wrapped around at the | |
1604 | high end of the buffer, we test both pieces after each | |
1605 | discard. */ | |
1606 | while (1) | |
1607 | { | |
1608 | /* First, if we have two free parts, try the upper one first. */ | |
fa593d66 | 1609 | if (tbctrl->end_free < tbctrl->free) |
219f2f23 | 1610 | { |
fa593d66 | 1611 | if (tbctrl->free + amt <= trace_buffer_hi) |
219f2f23 PA |
1612 | /* We have enough in the upper part. */ |
1613 | break; | |
1614 | else | |
1615 | { | |
1616 | /* Our high part of free space wasn't enough. Give up | |
1617 | on it for now, set wraparound. We will recover the | |
1618 | space later, if/when the wrapped-around traceframe is | |
1619 | discarded. */ | |
1620 | trace_debug ("Upper part too small, setting wraparound"); | |
fa593d66 PA |
1621 | tbctrl->wrap = tbctrl->free; |
1622 | tbctrl->free = trace_buffer_lo; | |
219f2f23 PA |
1623 | } |
1624 | } | |
1625 | ||
1626 | /* The normal case. */ | |
fa593d66 | 1627 | if (tbctrl->free + amt <= tbctrl->end_free) |
219f2f23 PA |
1628 | break; |
1629 | ||
fa593d66 PA |
1630 | #ifdef IN_PROCESS_AGENT |
1631 | /* The IP Agent's buffer is always circular. It isn't used | |
1632 | currently, but `circular_trace_buffer' could represent | |
1633 | GDBserver's mode. If we didn't find space, ask GDBserver to | |
1634 | flush. */ | |
1635 | ||
1636 | flush_trace_buffer (); | |
1637 | memory_barrier (); | |
1638 | if (tracing) | |
1639 | { | |
1640 | trace_debug ("gdbserver flushed buffer, retrying"); | |
1641 | goto again; | |
1642 | } | |
1643 | ||
1644 | /* GDBserver cancelled the tracing. Bail out as well. */ | |
1645 | return NULL; | |
1646 | #else | |
219f2f23 PA |
1647 | /* If we're here, then neither part is big enough, and |
1648 | non-circular trace buffers are now full. */ | |
1649 | if (!circular_trace_buffer) | |
1650 | { | |
1651 | trace_debug ("Not enough space in the trace buffer"); | |
1652 | return NULL; | |
1653 | } | |
1654 | ||
1655 | trace_debug ("Need more space in the trace buffer"); | |
1656 | ||
1657 | /* If we have a circular buffer, we can try discarding the | |
1658 | oldest traceframe and see if that helps. */ | |
1659 | oldest = FIRST_TRACEFRAME (); | |
1660 | if (oldest->tpnum == 0) | |
1661 | { | |
1662 | /* Not good; we have no traceframes to free. Perhaps we're | |
1663 | asking for a block that is larger than the buffer? In | |
1664 | any case, give up. */ | |
1665 | trace_debug ("No traceframes to discard"); | |
1666 | return NULL; | |
1667 | } | |
1668 | ||
fa593d66 PA |
1669 | /* We don't run this code in the in-process agent currently. |
1670 | E.g., we could leave the in-process agent in autonomous | |
1671 | circular mode if we only have fast tracepoints. If we do | |
1672 | that, then this bit becomes racy with GDBserver, which also | |
1673 | writes to this counter. */ | |
219f2f23 PA |
1674 | --traceframe_write_count; |
1675 | ||
1676 | new_start = (unsigned char *) NEXT_TRACEFRAME (oldest); | |
1677 | /* If we freed the traceframe that wrapped around, go back | |
1678 | to the non-wrap case. */ | |
fa593d66 | 1679 | if (new_start < tbctrl->start) |
219f2f23 PA |
1680 | { |
1681 | trace_debug ("Discarding past the wraparound"); | |
fa593d66 | 1682 | tbctrl->wrap = trace_buffer_hi; |
219f2f23 | 1683 | } |
fa593d66 PA |
1684 | tbctrl->start = new_start; |
1685 | tbctrl->end_free = tbctrl->start; | |
219f2f23 PA |
1686 | |
1687 | trace_debug ("Discarded a traceframe\n" | |
fa593d66 PA |
1688 | "Trace buffer [%d], start=%d free=%d " |
1689 | "endfree=%d wrap=%d hi=%d", | |
1690 | curr, | |
1691 | (int) (tbctrl->start - trace_buffer_lo), | |
1692 | (int) (tbctrl->free - trace_buffer_lo), | |
1693 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1694 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1695 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1696 | ||
1697 | /* Now go back around the loop. The discard might have resulted | |
1698 | in either one or two pieces of free space, so we want to try | |
1699 | both before freeing any more traceframes. */ | |
fa593d66 | 1700 | #endif |
219f2f23 PA |
1701 | } |
1702 | ||
1703 | /* If we get here, we know we can provide the asked-for space. */ | |
1704 | ||
fa593d66 | 1705 | rslt = tbctrl->free; |
219f2f23 PA |
1706 | |
1707 | /* Adjust the request back down, now that we know we have space for | |
fa593d66 PA |
1708 | the marker, but don't commit to AMT yet, we may still need to |
1709 | restart the operation if GDBserver touches the trace buffer | |
1710 | (obviously only important in the in-process agent's version). */ | |
1711 | tbctrl->free += (amt - sizeof (struct traceframe)); | |
1712 | ||
1713 | /* Or not. If GDBserver changed the trace buffer behind our back, | |
1714 | we get to restart a new allocation attempt. */ | |
1715 | ||
1716 | #ifdef IN_PROCESS_AGENT | |
1717 | /* Build the tentative token. */ | |
2ece8244 YQ |
1718 | commit_count = (((prev & GDBSERVER_FLUSH_COUNT_MASK_CURR) + 0x100) |
1719 | & GDBSERVER_FLUSH_COUNT_MASK_CURR); | |
1720 | commit = (((prev & GDBSERVER_FLUSH_COUNT_MASK_CURR) << 12) | |
fa593d66 PA |
1721 | | commit_count |
1722 | | curr); | |
1723 | ||
1724 | /* Try to commit it. */ | |
1725 | readout = cmpxchg (&trace_buffer_ctrl_curr, prev, commit); | |
1726 | if (readout != prev) | |
1727 | { | |
1728 | trace_debug ("GDBserver has touched the trace buffer, restarting." | |
1729 | " (prev=%08x, commit=%08x, readout=%08x)", | |
1730 | prev, commit, readout); | |
1731 | goto again; | |
1732 | } | |
219f2f23 | 1733 | |
fa593d66 PA |
1734 | /* Hold your horses here. Even if that change was committed, |
1735 | GDBserver could come in, and clobber it. We need to hold to be | |
1736 | able to tell if GDBserver clobbers before or after we committed | |
1737 | the change. Whenever GDBserver goes about touching the IPA | |
1738 | buffer, it sets a breakpoint in this routine, so we have a sync | |
1739 | point here. */ | |
1740 | about_to_request_buffer_space (); | |
219f2f23 | 1741 | |
fa593d66 PA |
1742 | /* Check if the change has been effective, even if GDBserver stopped |
1743 | us at the breakpoint. */ | |
219f2f23 | 1744 | |
fa593d66 PA |
1745 | { |
1746 | unsigned int refetch; | |
219f2f23 | 1747 | |
fa593d66 PA |
1748 | memory_barrier (); |
1749 | ||
1750 | refetch = trace_buffer_ctrl_curr; | |
1751 | ||
2ece8244 YQ |
1752 | if (refetch == commit |
1753 | || ((refetch & GDBSERVER_FLUSH_COUNT_MASK_PREV) >> 12) == commit_count) | |
fa593d66 PA |
1754 | { |
1755 | /* effective */ | |
1756 | trace_debug ("change is effective: (prev=%08x, commit=%08x, " | |
1757 | "readout=%08x, refetch=%08x)", | |
1758 | prev, commit, readout, refetch); | |
1759 | } | |
1760 | else | |
1761 | { | |
1762 | trace_debug ("GDBserver has touched the trace buffer, not effective." | |
1763 | " (prev=%08x, commit=%08x, readout=%08x, refetch=%08x)", | |
1764 | prev, commit, readout, refetch); | |
1765 | goto again; | |
1766 | } | |
1767 | } | |
1768 | #endif | |
1769 | ||
1770 | /* We have a new piece of the trace buffer. Hurray! */ | |
1771 | ||
1772 | /* Add an EOB marker just past this allocation. */ | |
1773 | ((struct traceframe *) tbctrl->free)->tpnum = 0; | |
1774 | ((struct traceframe *) tbctrl->free)->data_size = 0; | |
1775 | ||
1776 | /* Adjust the request back down, now that we know we have space for | |
1777 | the marker. */ | |
1778 | amt -= sizeof (struct traceframe); | |
1779 | ||
1780 | if (debug_threads) | |
1781 | { | |
219f2f23 | 1782 | trace_debug ("Allocated %d bytes", (int) amt); |
fa593d66 PA |
1783 | trace_debug ("Trace buffer [%d] start=%d free=%d " |
1784 | "endfree=%d wrap=%d hi=%d", | |
1785 | curr, | |
1786 | (int) (tbctrl->start - trace_buffer_lo), | |
1787 | (int) (tbctrl->free - trace_buffer_lo), | |
1788 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1789 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1790 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1791 | } | |
1792 | ||
1793 | return rslt; | |
1794 | } | |
1795 | ||
fa593d66 PA |
1796 | #ifndef IN_PROCESS_AGENT |
1797 | ||
219f2f23 PA |
1798 | /* Return the total free space. This is not necessarily the largest |
1799 | block we can allocate, because of the two-part case. */ | |
1800 | ||
1801 | static int | |
1802 | free_space (void) | |
1803 | { | |
1804 | if (trace_buffer_free <= trace_buffer_end_free) | |
1805 | return trace_buffer_end_free - trace_buffer_free; | |
1806 | else | |
1807 | return ((trace_buffer_end_free - trace_buffer_lo) | |
1808 | + (trace_buffer_hi - trace_buffer_free)); | |
1809 | } | |
1810 | ||
1811 | /* An 'S' in continuation packets indicates remainder are for | |
1812 | while-stepping. */ | |
1813 | ||
1814 | static int seen_step_action_flag; | |
1815 | ||
1e4d1764 YQ |
1816 | /* Create a tracepoint (location) with given number and address. Add this |
1817 | new tracepoint to list and sort this list. */ | |
219f2f23 PA |
1818 | |
1819 | static struct tracepoint * | |
1820 | add_tracepoint (int num, CORE_ADDR addr) | |
1821 | { | |
1e4d1764 | 1822 | struct tracepoint *tpoint, **tp_next; |
219f2f23 PA |
1823 | |
1824 | tpoint = xmalloc (sizeof (struct tracepoint)); | |
1825 | tpoint->number = num; | |
1826 | tpoint->address = addr; | |
1827 | tpoint->numactions = 0; | |
1828 | tpoint->actions = NULL; | |
1829 | tpoint->actions_str = NULL; | |
1830 | tpoint->cond = NULL; | |
1831 | tpoint->num_step_actions = 0; | |
1832 | tpoint->step_actions = NULL; | |
1833 | tpoint->step_actions_str = NULL; | |
fa593d66 PA |
1834 | /* Start all off as regular (slow) tracepoints. */ |
1835 | tpoint->type = trap_tracepoint; | |
1836 | tpoint->orig_size = -1; | |
219f2f23 | 1837 | tpoint->source_strings = NULL; |
6a271cae | 1838 | tpoint->compiled_cond = 0; |
219f2f23 PA |
1839 | tpoint->handle = NULL; |
1840 | tpoint->next = NULL; | |
1841 | ||
1e4d1764 YQ |
1842 | /* Find a place to insert this tracepoint into list in order to keep |
1843 | the tracepoint list still in the ascending order. There may be | |
1844 | multiple tracepoints at the same address as TPOINT's, and this | |
1845 | guarantees TPOINT is inserted after all the tracepoints which are | |
1846 | set at the same address. For example, fast tracepoints A, B, C are | |
1847 | set at the same address, and D is to be insert at the same place as | |
1848 | well, | |
1849 | ||
1850 | -->| A |--> | B |-->| C |->... | |
1851 | ||
1852 | One jump pad was created for tracepoint A, B, and C, and the target | |
1853 | address of A is referenced/used in jump pad. So jump pad will let | |
1854 | inferior jump to A. If D is inserted in front of A, like this, | |
1855 | ||
1856 | -->| D |-->| A |--> | B |-->| C |->... | |
1857 | ||
1858 | without updating jump pad, D is not reachable during collect, which | |
1859 | is wrong. As we can see, the order of B, C and D doesn't matter, but | |
1860 | A should always be the `first' one. */ | |
1861 | for (tp_next = &tracepoints; | |
1862 | (*tp_next) != NULL && (*tp_next)->address <= tpoint->address; | |
1863 | tp_next = &(*tp_next)->next) | |
1864 | ; | |
1865 | tpoint->next = *tp_next; | |
1866 | *tp_next = tpoint; | |
219f2f23 PA |
1867 | last_tracepoint = tpoint; |
1868 | ||
1869 | seen_step_action_flag = 0; | |
1870 | ||
1871 | return tpoint; | |
1872 | } | |
1873 | ||
fa593d66 PA |
1874 | #ifndef IN_PROCESS_AGENT |
1875 | ||
219f2f23 PA |
1876 | /* Return the tracepoint with the given number and address, or NULL. */ |
1877 | ||
1878 | static struct tracepoint * | |
1879 | find_tracepoint (int id, CORE_ADDR addr) | |
1880 | { | |
1881 | struct tracepoint *tpoint; | |
1882 | ||
1883 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
1884 | if (tpoint->number == id && tpoint->address == addr) | |
1885 | return tpoint; | |
1886 | ||
1887 | return NULL; | |
1888 | } | |
1889 | ||
f4647387 YQ |
1890 | /* Remove TPOINT from global list. */ |
1891 | ||
1892 | static void | |
1893 | remove_tracepoint (struct tracepoint *tpoint) | |
1894 | { | |
1895 | struct tracepoint *tp, *tp_prev; | |
1896 | ||
1897 | for (tp = tracepoints, tp_prev = NULL; tp && tp != tpoint; | |
1898 | tp_prev = tp, tp = tp->next) | |
1899 | ; | |
1900 | ||
1901 | if (tp) | |
1902 | { | |
1903 | if (tp_prev) | |
1904 | tp_prev->next = tp->next; | |
1905 | else | |
1906 | tracepoints = tp->next; | |
1907 | ||
1908 | xfree (tp); | |
1909 | } | |
1910 | } | |
1911 | ||
219f2f23 PA |
1912 | /* There may be several tracepoints with the same number (because they |
1913 | are "locations", in GDB parlance); return the next one after the | |
1914 | given tracepoint, or search from the beginning of the list if the | |
1915 | first argument is NULL. */ | |
1916 | ||
1917 | static struct tracepoint * | |
1918 | find_next_tracepoint_by_number (struct tracepoint *prev_tp, int num) | |
1919 | { | |
1920 | struct tracepoint *tpoint; | |
1921 | ||
1922 | if (prev_tp) | |
1923 | tpoint = prev_tp->next; | |
1924 | else | |
1925 | tpoint = tracepoints; | |
1926 | for (; tpoint; tpoint = tpoint->next) | |
1927 | if (tpoint->number == num) | |
1928 | return tpoint; | |
1929 | ||
1930 | return NULL; | |
1931 | } | |
1932 | ||
fa593d66 PA |
1933 | #endif |
1934 | ||
219f2f23 PA |
1935 | /* Append another action to perform when the tracepoint triggers. */ |
1936 | ||
1937 | static void | |
1938 | add_tracepoint_action (struct tracepoint *tpoint, char *packet) | |
1939 | { | |
1940 | char *act; | |
1941 | ||
1942 | if (*packet == 'S') | |
1943 | { | |
1944 | seen_step_action_flag = 1; | |
1945 | ++packet; | |
1946 | } | |
1947 | ||
1948 | act = packet; | |
1949 | ||
1950 | while (*act) | |
1951 | { | |
1952 | char *act_start = act; | |
1953 | struct tracepoint_action *action = NULL; | |
1954 | ||
1955 | switch (*act) | |
1956 | { | |
1957 | case 'M': | |
1958 | { | |
1959 | struct collect_memory_action *maction; | |
1960 | ULONGEST basereg; | |
1961 | int is_neg; | |
1962 | ||
1963 | maction = xmalloc (sizeof *maction); | |
1964 | maction->base.type = *act; | |
8d0d92cd | 1965 | maction->base.ops = &m_tracepoint_action_ops; |
219f2f23 PA |
1966 | action = &maction->base; |
1967 | ||
1968 | ++act; | |
1969 | is_neg = (*act == '-'); | |
1970 | if (*act == '-') | |
1971 | ++act; | |
1972 | act = unpack_varlen_hex (act, &basereg); | |
1973 | ++act; | |
1974 | act = unpack_varlen_hex (act, &maction->addr); | |
1975 | ++act; | |
1976 | act = unpack_varlen_hex (act, &maction->len); | |
1977 | maction->basereg = (is_neg | |
1978 | ? - (int) basereg | |
1979 | : (int) basereg); | |
1980 | trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)", | |
1981 | pulongest (maction->len), | |
1982 | paddress (maction->addr), maction->basereg); | |
1983 | break; | |
1984 | } | |
1985 | case 'R': | |
1986 | { | |
1987 | struct collect_registers_action *raction; | |
1988 | ||
1989 | raction = xmalloc (sizeof *raction); | |
1990 | raction->base.type = *act; | |
8d0d92cd | 1991 | raction->base.ops = &r_tracepoint_action_ops; |
219f2f23 PA |
1992 | action = &raction->base; |
1993 | ||
1994 | trace_debug ("Want to collect registers"); | |
1995 | ++act; | |
1996 | /* skip past hex digits of mask for now */ | |
1997 | while (isxdigit(*act)) | |
1998 | ++act; | |
1999 | break; | |
2000 | } | |
0fb4aa4b PA |
2001 | case 'L': |
2002 | { | |
2003 | struct collect_static_trace_data_action *raction; | |
2004 | ||
2005 | raction = xmalloc (sizeof *raction); | |
2006 | raction->base.type = *act; | |
8d0d92cd | 2007 | raction->base.ops = &l_tracepoint_action_ops; |
0fb4aa4b PA |
2008 | action = &raction->base; |
2009 | ||
2010 | trace_debug ("Want to collect static trace data"); | |
2011 | ++act; | |
2012 | break; | |
2013 | } | |
219f2f23 PA |
2014 | case 'S': |
2015 | trace_debug ("Unexpected step action, ignoring"); | |
2016 | ++act; | |
2017 | break; | |
2018 | case 'X': | |
2019 | { | |
2020 | struct eval_expr_action *xaction; | |
2021 | ||
2022 | xaction = xmalloc (sizeof (*xaction)); | |
2023 | xaction->base.type = *act; | |
8d0d92cd | 2024 | xaction->base.ops = &x_tracepoint_action_ops; |
219f2f23 PA |
2025 | action = &xaction->base; |
2026 | ||
2027 | trace_debug ("Want to evaluate expression"); | |
5e1dc496 | 2028 | xaction->expr = gdb_parse_agent_expr (&act); |
219f2f23 PA |
2029 | break; |
2030 | } | |
2031 | default: | |
2032 | trace_debug ("unknown trace action '%c', ignoring...", *act); | |
2033 | break; | |
2034 | case '-': | |
2035 | break; | |
2036 | } | |
2037 | ||
2038 | if (action == NULL) | |
2039 | break; | |
2040 | ||
2041 | if (seen_step_action_flag) | |
2042 | { | |
2043 | tpoint->num_step_actions++; | |
2044 | ||
2045 | tpoint->step_actions | |
2046 | = xrealloc (tpoint->step_actions, | |
2047 | (sizeof (*tpoint->step_actions) | |
2048 | * tpoint->num_step_actions)); | |
2049 | tpoint->step_actions_str | |
2050 | = xrealloc (tpoint->step_actions_str, | |
2051 | (sizeof (*tpoint->step_actions_str) | |
2052 | * tpoint->num_step_actions)); | |
2053 | tpoint->step_actions[tpoint->num_step_actions - 1] = action; | |
2054 | tpoint->step_actions_str[tpoint->num_step_actions - 1] | |
baea0dae | 2055 | = savestring (act_start, act - act_start); |
219f2f23 PA |
2056 | } |
2057 | else | |
2058 | { | |
2059 | tpoint->numactions++; | |
2060 | tpoint->actions | |
2061 | = xrealloc (tpoint->actions, | |
2062 | sizeof (*tpoint->actions) * tpoint->numactions); | |
2063 | tpoint->actions_str | |
2064 | = xrealloc (tpoint->actions_str, | |
2065 | sizeof (*tpoint->actions_str) * tpoint->numactions); | |
2066 | tpoint->actions[tpoint->numactions - 1] = action; | |
2067 | tpoint->actions_str[tpoint->numactions - 1] | |
baea0dae | 2068 | = savestring (act_start, act - act_start); |
219f2f23 PA |
2069 | } |
2070 | } | |
2071 | } | |
2072 | ||
fa593d66 PA |
2073 | #endif |
2074 | ||
219f2f23 PA |
2075 | /* Find or create a trace state variable with the given number. */ |
2076 | ||
2077 | static struct trace_state_variable * | |
2078 | get_trace_state_variable (int num) | |
2079 | { | |
2080 | struct trace_state_variable *tsv; | |
2081 | ||
fa593d66 PA |
2082 | #ifdef IN_PROCESS_AGENT |
2083 | /* Search for an existing variable. */ | |
2084 | for (tsv = alloced_trace_state_variables; tsv; tsv = tsv->next) | |
2085 | if (tsv->number == num) | |
2086 | return tsv; | |
2087 | #endif | |
2088 | ||
219f2f23 PA |
2089 | /* Search for an existing variable. */ |
2090 | for (tsv = trace_state_variables; tsv; tsv = tsv->next) | |
2091 | if (tsv->number == num) | |
2092 | return tsv; | |
2093 | ||
2094 | return NULL; | |
2095 | } | |
2096 | ||
2097 | /* Find or create a trace state variable with the given number. */ | |
2098 | ||
2099 | static struct trace_state_variable * | |
fa593d66 | 2100 | create_trace_state_variable (int num, int gdb) |
219f2f23 PA |
2101 | { |
2102 | struct trace_state_variable *tsv; | |
2103 | ||
2104 | tsv = get_trace_state_variable (num); | |
2105 | if (tsv != NULL) | |
2106 | return tsv; | |
2107 | ||
2108 | /* Create a new variable. */ | |
2109 | tsv = xmalloc (sizeof (struct trace_state_variable)); | |
2110 | tsv->number = num; | |
2111 | tsv->initial_value = 0; | |
2112 | tsv->value = 0; | |
2113 | tsv->getter = NULL; | |
2114 | tsv->name = NULL; | |
fa593d66 PA |
2115 | #ifdef IN_PROCESS_AGENT |
2116 | if (!gdb) | |
2117 | { | |
2118 | tsv->next = alloced_trace_state_variables; | |
2119 | alloced_trace_state_variables = tsv; | |
2120 | } | |
2121 | else | |
2122 | #endif | |
2123 | { | |
2124 | tsv->next = trace_state_variables; | |
2125 | trace_state_variables = tsv; | |
2126 | } | |
219f2f23 PA |
2127 | return tsv; |
2128 | } | |
2129 | ||
6a271cae | 2130 | IP_AGENT_EXPORT LONGEST |
219f2f23 PA |
2131 | get_trace_state_variable_value (int num) |
2132 | { | |
2133 | struct trace_state_variable *tsv; | |
2134 | ||
2135 | tsv = get_trace_state_variable (num); | |
2136 | ||
2137 | if (!tsv) | |
2138 | { | |
2139 | trace_debug ("No trace state variable %d, skipping value get", num); | |
2140 | return 0; | |
2141 | } | |
2142 | ||
2143 | /* Call a getter function if we have one. While it's tempting to | |
2144 | set up something to only call the getter once per tracepoint hit, | |
2145 | it could run afoul of thread races. Better to let the getter | |
2146 | handle it directly, if necessary to worry about it. */ | |
2147 | if (tsv->getter) | |
2148 | tsv->value = (tsv->getter) (); | |
2149 | ||
2150 | trace_debug ("get_trace_state_variable_value(%d) ==> %s", | |
2151 | num, plongest (tsv->value)); | |
2152 | ||
2153 | return tsv->value; | |
2154 | } | |
2155 | ||
6a271cae | 2156 | IP_AGENT_EXPORT void |
219f2f23 PA |
2157 | set_trace_state_variable_value (int num, LONGEST val) |
2158 | { | |
2159 | struct trace_state_variable *tsv; | |
2160 | ||
2161 | tsv = get_trace_state_variable (num); | |
2162 | ||
2163 | if (!tsv) | |
2164 | { | |
2165 | trace_debug ("No trace state variable %d, skipping value set", num); | |
2166 | return; | |
2167 | } | |
2168 | ||
2169 | tsv->value = val; | |
2170 | } | |
2171 | ||
5e1dc496 LM |
2172 | LONGEST |
2173 | agent_get_trace_state_variable_value (int num) | |
2174 | { | |
2175 | return get_trace_state_variable_value (num); | |
2176 | } | |
2177 | ||
2178 | void | |
2179 | agent_set_trace_state_variable_value (int num, LONGEST val) | |
2180 | { | |
2181 | set_trace_state_variable_value (num, val); | |
2182 | } | |
2183 | ||
219f2f23 PA |
2184 | static void |
2185 | set_trace_state_variable_name (int num, const char *name) | |
2186 | { | |
2187 | struct trace_state_variable *tsv; | |
2188 | ||
2189 | tsv = get_trace_state_variable (num); | |
2190 | ||
2191 | if (!tsv) | |
2192 | { | |
2193 | trace_debug ("No trace state variable %d, skipping name set", num); | |
2194 | return; | |
2195 | } | |
2196 | ||
2197 | tsv->name = (char *) name; | |
2198 | } | |
2199 | ||
2200 | static void | |
2201 | set_trace_state_variable_getter (int num, LONGEST (*getter) (void)) | |
2202 | { | |
2203 | struct trace_state_variable *tsv; | |
2204 | ||
2205 | tsv = get_trace_state_variable (num); | |
2206 | ||
2207 | if (!tsv) | |
2208 | { | |
2209 | trace_debug ("No trace state variable %d, skipping getter set", num); | |
2210 | return; | |
2211 | } | |
2212 | ||
2213 | tsv->getter = getter; | |
2214 | } | |
2215 | ||
2216 | /* Add a raw traceframe for the given tracepoint. */ | |
2217 | ||
2218 | static struct traceframe * | |
2219 | add_traceframe (struct tracepoint *tpoint) | |
2220 | { | |
2221 | struct traceframe *tframe; | |
2222 | ||
2223 | tframe = trace_buffer_alloc (sizeof (struct traceframe)); | |
2224 | ||
2225 | if (tframe == NULL) | |
2226 | return NULL; | |
2227 | ||
2228 | tframe->tpnum = tpoint->number; | |
2229 | tframe->data_size = 0; | |
2230 | ||
2231 | return tframe; | |
2232 | } | |
2233 | ||
2234 | /* Add a block to the traceframe currently being worked on. */ | |
2235 | ||
2236 | static unsigned char * | |
5ae4861a YQ |
2237 | add_traceframe_block (struct traceframe *tframe, |
2238 | struct tracepoint *tpoint, int amt) | |
219f2f23 PA |
2239 | { |
2240 | unsigned char *block; | |
2241 | ||
2242 | if (!tframe) | |
2243 | return NULL; | |
2244 | ||
2245 | block = trace_buffer_alloc (amt); | |
2246 | ||
2247 | if (!block) | |
2248 | return NULL; | |
2249 | ||
5ae4861a YQ |
2250 | gdb_assert (tframe->tpnum == tpoint->number); |
2251 | ||
219f2f23 | 2252 | tframe->data_size += amt; |
5ae4861a | 2253 | tpoint->traceframe_usage += amt; |
219f2f23 PA |
2254 | |
2255 | return block; | |
2256 | } | |
2257 | ||
2258 | /* Flag that the current traceframe is finished. */ | |
2259 | ||
2260 | static void | |
2261 | finish_traceframe (struct traceframe *tframe) | |
2262 | { | |
2263 | ++traceframe_write_count; | |
2264 | ++traceframes_created; | |
2265 | } | |
2266 | ||
fa593d66 PA |
2267 | #ifndef IN_PROCESS_AGENT |
2268 | ||
219f2f23 PA |
2269 | /* Given a traceframe number NUM, find the NUMth traceframe in the |
2270 | buffer. */ | |
2271 | ||
2272 | static struct traceframe * | |
2273 | find_traceframe (int num) | |
2274 | { | |
2275 | struct traceframe *tframe; | |
2276 | int tfnum = 0; | |
2277 | ||
2278 | for (tframe = FIRST_TRACEFRAME (); | |
2279 | tframe->tpnum != 0; | |
2280 | tframe = NEXT_TRACEFRAME (tframe)) | |
2281 | { | |
2282 | if (tfnum == num) | |
2283 | return tframe; | |
2284 | ++tfnum; | |
2285 | } | |
2286 | ||
2287 | return NULL; | |
2288 | } | |
2289 | ||
2290 | static CORE_ADDR | |
2291 | get_traceframe_address (struct traceframe *tframe) | |
2292 | { | |
2293 | CORE_ADDR addr; | |
2294 | struct tracepoint *tpoint; | |
2295 | ||
2296 | addr = traceframe_get_pc (tframe); | |
2297 | ||
2298 | if (addr) | |
2299 | return addr; | |
2300 | ||
2301 | /* Fallback strategy, will be incorrect for while-stepping frames | |
2302 | and multi-location tracepoints. */ | |
2303 | tpoint = find_next_tracepoint_by_number (NULL, tframe->tpnum); | |
2304 | return tpoint->address; | |
2305 | } | |
2306 | ||
2307 | /* Search for the next traceframe whose address is inside or outside | |
2308 | the given range. */ | |
2309 | ||
2310 | static struct traceframe * | |
2311 | find_next_traceframe_in_range (CORE_ADDR lo, CORE_ADDR hi, int inside_p, | |
2312 | int *tfnump) | |
2313 | { | |
2314 | struct traceframe *tframe; | |
2315 | CORE_ADDR tfaddr; | |
2316 | ||
2317 | *tfnump = current_traceframe + 1; | |
2318 | tframe = find_traceframe (*tfnump); | |
2319 | /* The search is not supposed to wrap around. */ | |
2320 | if (!tframe) | |
2321 | { | |
2322 | *tfnump = -1; | |
2323 | return NULL; | |
2324 | } | |
2325 | ||
2326 | for (; tframe->tpnum != 0; tframe = NEXT_TRACEFRAME (tframe)) | |
2327 | { | |
2328 | tfaddr = get_traceframe_address (tframe); | |
2329 | if (inside_p | |
2330 | ? (lo <= tfaddr && tfaddr <= hi) | |
2331 | : (lo > tfaddr || tfaddr > hi)) | |
2332 | return tframe; | |
2333 | ++*tfnump; | |
2334 | } | |
2335 | ||
2336 | *tfnump = -1; | |
2337 | return NULL; | |
2338 | } | |
2339 | ||
2340 | /* Search for the next traceframe recorded by the given tracepoint. | |
2341 | Note that for multi-location tracepoints, this will find whatever | |
2342 | location appears first. */ | |
2343 | ||
2344 | static struct traceframe * | |
2345 | find_next_traceframe_by_tracepoint (int num, int *tfnump) | |
2346 | { | |
2347 | struct traceframe *tframe; | |
2348 | ||
2349 | *tfnump = current_traceframe + 1; | |
2350 | tframe = find_traceframe (*tfnump); | |
2351 | /* The search is not supposed to wrap around. */ | |
2352 | if (!tframe) | |
2353 | { | |
2354 | *tfnump = -1; | |
2355 | return NULL; | |
2356 | } | |
2357 | ||
2358 | for (; tframe->tpnum != 0; tframe = NEXT_TRACEFRAME (tframe)) | |
2359 | { | |
2360 | if (tframe->tpnum == num) | |
2361 | return tframe; | |
2362 | ++*tfnump; | |
2363 | } | |
2364 | ||
2365 | *tfnump = -1; | |
2366 | return NULL; | |
2367 | } | |
2368 | ||
fa593d66 PA |
2369 | #endif |
2370 | ||
2371 | #ifndef IN_PROCESS_AGENT | |
2372 | ||
219f2f23 PA |
2373 | /* Clear all past trace state. */ |
2374 | ||
2375 | static void | |
2376 | cmd_qtinit (char *packet) | |
2377 | { | |
2378 | struct trace_state_variable *tsv, *prev, *next; | |
2379 | ||
b05ec7a5 AT |
2380 | /* Can't do this command without a pid attached. */ |
2381 | if (current_thread == NULL) | |
2382 | { | |
2383 | write_enn (packet); | |
2384 | return; | |
2385 | } | |
2386 | ||
219f2f23 PA |
2387 | /* Make sure we don't try to read from a trace frame. */ |
2388 | current_traceframe = -1; | |
2389 | ||
1ebff1fd HAQ |
2390 | stop_tracing (); |
2391 | ||
219f2f23 PA |
2392 | trace_debug ("Initializing the trace"); |
2393 | ||
2394 | clear_installed_tracepoints (); | |
2395 | clear_readonly_regions (); | |
2396 | ||
2397 | tracepoints = NULL; | |
2398 | last_tracepoint = NULL; | |
2399 | ||
2400 | /* Clear out any leftover trace state variables. Ones with target | |
2401 | defined getters should be kept however. */ | |
2402 | prev = NULL; | |
2403 | tsv = trace_state_variables; | |
2404 | while (tsv) | |
2405 | { | |
2406 | trace_debug ("Looking at var %d", tsv->number); | |
2407 | if (tsv->getter == NULL) | |
2408 | { | |
2409 | next = tsv->next; | |
2410 | if (prev) | |
2411 | prev->next = next; | |
2412 | else | |
2413 | trace_state_variables = next; | |
2414 | trace_debug ("Deleting var %d", tsv->number); | |
2415 | free (tsv); | |
2416 | tsv = next; | |
2417 | } | |
2418 | else | |
2419 | { | |
2420 | prev = tsv; | |
2421 | tsv = tsv->next; | |
2422 | } | |
2423 | } | |
2424 | ||
2425 | clear_trace_buffer (); | |
fa593d66 | 2426 | clear_inferior_trace_buffer (); |
219f2f23 PA |
2427 | |
2428 | write_ok (packet); | |
2429 | } | |
2430 | ||
0fb4aa4b PA |
2431 | /* Unprobe the UST marker at ADDRESS. */ |
2432 | ||
2433 | static void | |
2434 | unprobe_marker_at (CORE_ADDR address) | |
2435 | { | |
2fa291ac | 2436 | char cmd[IPA_CMD_BUF_SIZE]; |
0fb4aa4b PA |
2437 | |
2438 | sprintf (cmd, "unprobe_marker_at:%s", paddress (address)); | |
42476b70 | 2439 | run_inferior_command (cmd, strlen (cmd) + 1); |
0fb4aa4b PA |
2440 | } |
2441 | ||
219f2f23 PA |
2442 | /* Restore the program to its pre-tracing state. This routine may be called |
2443 | in error situations, so it needs to be careful about only restoring | |
2444 | from known-valid bits. */ | |
2445 | ||
2446 | static void | |
2447 | clear_installed_tracepoints (void) | |
2448 | { | |
2449 | struct tracepoint *tpoint; | |
2450 | struct tracepoint *prev_stpoint; | |
2451 | ||
7984d532 | 2452 | pause_all (1); |
7984d532 | 2453 | |
219f2f23 PA |
2454 | prev_stpoint = NULL; |
2455 | ||
2456 | /* Restore any bytes overwritten by tracepoints. */ | |
2457 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
2458 | { | |
219f2f23 PA |
2459 | /* Catch the case where we might try to remove a tracepoint that |
2460 | was never actually installed. */ | |
2461 | if (tpoint->handle == NULL) | |
2462 | { | |
2463 | trace_debug ("Tracepoint %d at 0x%s was " | |
2464 | "never installed, nothing to clear", | |
2465 | tpoint->number, paddress (tpoint->address)); | |
2466 | continue; | |
2467 | } | |
2468 | ||
fa593d66 PA |
2469 | switch (tpoint->type) |
2470 | { | |
2471 | case trap_tracepoint: | |
2472 | delete_breakpoint (tpoint->handle); | |
2473 | break; | |
2474 | case fast_tracepoint: | |
2475 | delete_fast_tracepoint_jump (tpoint->handle); | |
2476 | break; | |
0fb4aa4b PA |
2477 | case static_tracepoint: |
2478 | if (prev_stpoint != NULL | |
2479 | && prev_stpoint->address == tpoint->address) | |
2480 | /* Nothing to do. We already unprobed a tracepoint set at | |
2481 | this marker address (and there can only be one probe | |
2482 | per marker). */ | |
2483 | ; | |
2484 | else | |
2485 | { | |
2486 | unprobe_marker_at (tpoint->address); | |
2487 | prev_stpoint = tpoint; | |
2488 | } | |
2489 | break; | |
fa593d66 PA |
2490 | } |
2491 | ||
219f2f23 PA |
2492 | tpoint->handle = NULL; |
2493 | } | |
7984d532 PA |
2494 | |
2495 | unpause_all (1); | |
219f2f23 PA |
2496 | } |
2497 | ||
2498 | /* Parse a packet that defines a tracepoint. */ | |
2499 | ||
2500 | static void | |
2501 | cmd_qtdp (char *own_buf) | |
2502 | { | |
2503 | int tppacket; | |
1e4d1764 YQ |
2504 | /* Whether there is a trailing hyphen at the end of the QTDP packet. */ |
2505 | int trail_hyphen = 0; | |
219f2f23 PA |
2506 | ULONGEST num; |
2507 | ULONGEST addr; | |
2508 | ULONGEST count; | |
2509 | struct tracepoint *tpoint; | |
2510 | char *actparm; | |
2511 | char *packet = own_buf; | |
2512 | ||
2513 | packet += strlen ("QTDP:"); | |
2514 | ||
2515 | /* A hyphen at the beginning marks a packet specifying actions for a | |
2516 | tracepoint already supplied. */ | |
2517 | tppacket = 1; | |
2518 | if (*packet == '-') | |
2519 | { | |
2520 | tppacket = 0; | |
2521 | ++packet; | |
2522 | } | |
2523 | packet = unpack_varlen_hex (packet, &num); | |
2524 | ++packet; /* skip a colon */ | |
2525 | packet = unpack_varlen_hex (packet, &addr); | |
2526 | ++packet; /* skip a colon */ | |
2527 | ||
2528 | /* See if we already have this tracepoint. */ | |
2529 | tpoint = find_tracepoint (num, addr); | |
2530 | ||
2531 | if (tppacket) | |
2532 | { | |
2533 | /* Duplicate tracepoints are never allowed. */ | |
2534 | if (tpoint) | |
2535 | { | |
2536 | trace_debug ("Tracepoint error: tracepoint %d" | |
2537 | " at 0x%s already exists", | |
2538 | (int) num, paddress (addr)); | |
2539 | write_enn (own_buf); | |
2540 | return; | |
2541 | } | |
2542 | ||
2543 | tpoint = add_tracepoint (num, addr); | |
2544 | ||
2545 | tpoint->enabled = (*packet == 'E'); | |
2546 | ++packet; /* skip 'E' */ | |
2547 | ++packet; /* skip a colon */ | |
2548 | packet = unpack_varlen_hex (packet, &count); | |
2549 | tpoint->step_count = count; | |
2550 | ++packet; /* skip a colon */ | |
2551 | packet = unpack_varlen_hex (packet, &count); | |
2552 | tpoint->pass_count = count; | |
2553 | /* See if we have any of the additional optional fields. */ | |
2554 | while (*packet == ':') | |
2555 | { | |
2556 | ++packet; | |
fa593d66 PA |
2557 | if (*packet == 'F') |
2558 | { | |
2559 | tpoint->type = fast_tracepoint; | |
2560 | ++packet; | |
2561 | packet = unpack_varlen_hex (packet, &count); | |
2562 | tpoint->orig_size = count; | |
2563 | } | |
0fb4aa4b PA |
2564 | else if (*packet == 'S') |
2565 | { | |
2566 | tpoint->type = static_tracepoint; | |
2567 | ++packet; | |
2568 | } | |
fa593d66 | 2569 | else if (*packet == 'X') |
219f2f23 PA |
2570 | { |
2571 | actparm = (char *) packet; | |
5e1dc496 | 2572 | tpoint->cond = gdb_parse_agent_expr (&actparm); |
219f2f23 PA |
2573 | packet = actparm; |
2574 | } | |
2575 | else if (*packet == '-') | |
2576 | break; | |
2577 | else if (*packet == '\0') | |
2578 | break; | |
2579 | else | |
2580 | trace_debug ("Unknown optional tracepoint field"); | |
2581 | } | |
2582 | if (*packet == '-') | |
1e4d1764 YQ |
2583 | { |
2584 | trail_hyphen = 1; | |
2585 | trace_debug ("Also has actions\n"); | |
2586 | } | |
219f2f23 | 2587 | |
fa593d66 | 2588 | trace_debug ("Defined %stracepoint %d at 0x%s, " |
5f18041e | 2589 | "enabled %d step %" PRIu64 " pass %" PRIu64, |
fa593d66 | 2590 | tpoint->type == fast_tracepoint ? "fast " |
5e0a92a9 | 2591 | : tpoint->type == static_tracepoint ? "static " : "", |
fa593d66 | 2592 | tpoint->number, paddress (tpoint->address), tpoint->enabled, |
219f2f23 PA |
2593 | tpoint->step_count, tpoint->pass_count); |
2594 | } | |
2595 | else if (tpoint) | |
2596 | add_tracepoint_action (tpoint, packet); | |
2597 | else | |
2598 | { | |
2599 | trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found", | |
2600 | (int) num, paddress (addr)); | |
2601 | write_enn (own_buf); | |
2602 | return; | |
2603 | } | |
2604 | ||
1e4d1764 YQ |
2605 | /* Install tracepoint during tracing only once for each tracepoint location. |
2606 | For each tracepoint loc, GDB may send multiple QTDP packets, and we can | |
2607 | determine the last QTDP packet for one tracepoint location by checking | |
2608 | trailing hyphen in QTDP packet. */ | |
2609 | if (tracing && !trail_hyphen) | |
2610 | { | |
fc3e5175 YQ |
2611 | struct tracepoint *tp = NULL; |
2612 | ||
1e4d1764 YQ |
2613 | /* Pause all threads temporarily while we patch tracepoints. */ |
2614 | pause_all (0); | |
2615 | ||
2616 | /* download_tracepoint will update global `tracepoints' | |
2617 | list, so it is unsafe to leave threads in jump pad. */ | |
2618 | stabilize_threads (); | |
2619 | ||
2620 | /* Freeze threads. */ | |
2621 | pause_all (1); | |
2622 | ||
fc3e5175 YQ |
2623 | |
2624 | if (tpoint->type != trap_tracepoint) | |
2625 | { | |
2626 | /* Find another fast or static tracepoint at the same address. */ | |
2627 | for (tp = tracepoints; tp; tp = tp->next) | |
2628 | { | |
2629 | if (tp->address == tpoint->address && tp->type == tpoint->type | |
2630 | && tp->number != tpoint->number) | |
2631 | break; | |
2632 | } | |
2633 | ||
2634 | /* TPOINT is installed at the same address as TP. */ | |
2635 | if (tp) | |
2636 | { | |
2637 | if (tpoint->type == fast_tracepoint) | |
2638 | clone_fast_tracepoint (tpoint, tp); | |
2639 | else if (tpoint->type == static_tracepoint) | |
2640 | tpoint->handle = (void *) -1; | |
2641 | } | |
2642 | } | |
2643 | ||
42476b70 YQ |
2644 | if (use_agent && tpoint->type == fast_tracepoint |
2645 | && agent_capability_check (AGENT_CAPA_FAST_TRACE)) | |
fc3e5175 | 2646 | { |
42476b70 YQ |
2647 | /* Download and install fast tracepoint by agent. */ |
2648 | if (tracepoint_send_agent (tpoint) == 0) | |
2649 | write_ok (own_buf); | |
2650 | else | |
2651 | { | |
2652 | write_enn (own_buf); | |
2653 | remove_tracepoint (tpoint); | |
2654 | } | |
fc3e5175 YQ |
2655 | } |
2656 | else | |
42476b70 YQ |
2657 | { |
2658 | download_tracepoint (tpoint); | |
2659 | ||
2660 | if (tpoint->type == trap_tracepoint || tp == NULL) | |
2661 | { | |
2662 | install_tracepoint (tpoint, own_buf); | |
2663 | if (strcmp (own_buf, "OK") != 0) | |
2664 | remove_tracepoint (tpoint); | |
2665 | } | |
2666 | else | |
2667 | write_ok (own_buf); | |
2668 | } | |
1e4d1764 YQ |
2669 | |
2670 | unpause_all (1); | |
2671 | return; | |
2672 | } | |
2673 | ||
219f2f23 PA |
2674 | write_ok (own_buf); |
2675 | } | |
2676 | ||
2677 | static void | |
2678 | cmd_qtdpsrc (char *own_buf) | |
2679 | { | |
2680 | ULONGEST num, addr, start, slen; | |
2681 | struct tracepoint *tpoint; | |
2682 | char *packet = own_buf; | |
2683 | char *saved, *srctype, *src; | |
2684 | size_t nbytes; | |
2685 | struct source_string *last, *newlast; | |
2686 | ||
2687 | packet += strlen ("QTDPsrc:"); | |
2688 | ||
2689 | packet = unpack_varlen_hex (packet, &num); | |
2690 | ++packet; /* skip a colon */ | |
2691 | packet = unpack_varlen_hex (packet, &addr); | |
2692 | ++packet; /* skip a colon */ | |
2693 | ||
2694 | /* See if we already have this tracepoint. */ | |
2695 | tpoint = find_tracepoint (num, addr); | |
2696 | ||
2697 | if (!tpoint) | |
2698 | { | |
2699 | trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found", | |
2700 | (int) num, paddress (addr)); | |
2701 | write_enn (own_buf); | |
2702 | return; | |
2703 | } | |
2704 | ||
2705 | saved = packet; | |
2706 | packet = strchr (packet, ':'); | |
2707 | srctype = xmalloc (packet - saved + 1); | |
2708 | memcpy (srctype, saved, packet - saved); | |
2709 | srctype[packet - saved] = '\0'; | |
2710 | ++packet; | |
2711 | packet = unpack_varlen_hex (packet, &start); | |
2712 | ++packet; /* skip a colon */ | |
2713 | packet = unpack_varlen_hex (packet, &slen); | |
2714 | ++packet; /* skip a colon */ | |
2715 | src = xmalloc (slen + 1); | |
ff0e980e | 2716 | nbytes = hex2bin (packet, (gdb_byte *) src, strlen (packet) / 2); |
219f2f23 PA |
2717 | src[nbytes] = '\0'; |
2718 | ||
2719 | newlast = xmalloc (sizeof (struct source_string)); | |
2720 | newlast->type = srctype; | |
2721 | newlast->str = src; | |
2722 | newlast->next = NULL; | |
2723 | /* Always add a source string to the end of the list; | |
2724 | this keeps sequences of actions/commands in the right | |
2725 | order. */ | |
2726 | if (tpoint->source_strings) | |
2727 | { | |
2728 | for (last = tpoint->source_strings; last->next; last = last->next) | |
2729 | ; | |
2730 | last->next = newlast; | |
2731 | } | |
2732 | else | |
2733 | tpoint->source_strings = newlast; | |
2734 | ||
2735 | write_ok (own_buf); | |
2736 | } | |
2737 | ||
2738 | static void | |
2739 | cmd_qtdv (char *own_buf) | |
2740 | { | |
2741 | ULONGEST num, val, builtin; | |
2742 | char *varname; | |
2743 | size_t nbytes; | |
2744 | struct trace_state_variable *tsv; | |
2745 | char *packet = own_buf; | |
2746 | ||
2747 | packet += strlen ("QTDV:"); | |
2748 | ||
2749 | packet = unpack_varlen_hex (packet, &num); | |
2750 | ++packet; /* skip a colon */ | |
2751 | packet = unpack_varlen_hex (packet, &val); | |
2752 | ++packet; /* skip a colon */ | |
2753 | packet = unpack_varlen_hex (packet, &builtin); | |
2754 | ++packet; /* skip a colon */ | |
2755 | ||
2756 | nbytes = strlen (packet) / 2; | |
2757 | varname = xmalloc (nbytes + 1); | |
ff0e980e | 2758 | nbytes = hex2bin (packet, (gdb_byte *) varname, nbytes); |
219f2f23 PA |
2759 | varname[nbytes] = '\0'; |
2760 | ||
fa593d66 | 2761 | tsv = create_trace_state_variable (num, 1); |
219f2f23 PA |
2762 | tsv->initial_value = (LONGEST) val; |
2763 | tsv->name = varname; | |
2764 | ||
2765 | set_trace_state_variable_value (num, (LONGEST) val); | |
2766 | ||
2767 | write_ok (own_buf); | |
2768 | } | |
2769 | ||
d248b706 KY |
2770 | static void |
2771 | cmd_qtenable_disable (char *own_buf, int enable) | |
2772 | { | |
2773 | char *packet = own_buf; | |
2774 | ULONGEST num, addr; | |
2775 | struct tracepoint *tp; | |
2776 | ||
2777 | packet += strlen (enable ? "QTEnable:" : "QTDisable:"); | |
2778 | packet = unpack_varlen_hex (packet, &num); | |
2779 | ++packet; /* skip a colon */ | |
2780 | packet = unpack_varlen_hex (packet, &addr); | |
2781 | ||
2782 | tp = find_tracepoint (num, addr); | |
2783 | ||
2784 | if (tp) | |
2785 | { | |
2786 | if ((enable && tp->enabled) || (!enable && !tp->enabled)) | |
2787 | { | |
2788 | trace_debug ("Tracepoint %d at 0x%s is already %s", | |
2789 | (int) num, paddress (addr), | |
2790 | enable ? "enabled" : "disabled"); | |
2791 | write_ok (own_buf); | |
2792 | return; | |
2793 | } | |
2794 | ||
2795 | trace_debug ("%s tracepoint %d at 0x%s", | |
2796 | enable ? "Enabling" : "Disabling", | |
2797 | (int) num, paddress (addr)); | |
2798 | ||
2799 | tp->enabled = enable; | |
2800 | ||
2801 | if (tp->type == fast_tracepoint || tp->type == static_tracepoint) | |
2802 | { | |
2803 | int ret; | |
2804 | int offset = offsetof (struct tracepoint, enabled); | |
2805 | CORE_ADDR obj_addr = tp->obj_addr_on_target + offset; | |
2806 | ||
2807 | ret = prepare_to_access_memory (); | |
2808 | if (ret) | |
2809 | { | |
2810 | trace_debug ("Failed to temporarily stop inferior threads"); | |
2811 | write_enn (own_buf); | |
2812 | return; | |
2813 | } | |
2814 | ||
2815 | ret = write_inferior_integer (obj_addr, enable); | |
2816 | done_accessing_memory (); | |
2817 | ||
2818 | if (ret) | |
2819 | { | |
2820 | trace_debug ("Cannot write enabled flag into " | |
2821 | "inferior process memory"); | |
2822 | write_enn (own_buf); | |
2823 | return; | |
2824 | } | |
2825 | } | |
2826 | ||
2827 | write_ok (own_buf); | |
2828 | } | |
2829 | else | |
2830 | { | |
2831 | trace_debug ("Tracepoint %d at 0x%s not found", | |
2832 | (int) num, paddress (addr)); | |
2833 | write_enn (own_buf); | |
2834 | } | |
2835 | } | |
2836 | ||
219f2f23 PA |
2837 | static void |
2838 | cmd_qtv (char *own_buf) | |
2839 | { | |
2840 | ULONGEST num; | |
eeb56fa7 | 2841 | LONGEST val = 0; |
219f2f23 PA |
2842 | int err; |
2843 | char *packet = own_buf; | |
2844 | ||
2845 | packet += strlen ("qTV:"); | |
f8f67713 | 2846 | unpack_varlen_hex (packet, &num); |
219f2f23 PA |
2847 | |
2848 | if (current_traceframe >= 0) | |
2849 | { | |
2850 | err = traceframe_read_tsv ((int) num, &val); | |
2851 | if (err) | |
2852 | { | |
2853 | strcpy (own_buf, "U"); | |
2854 | return; | |
2855 | } | |
2856 | } | |
2857 | /* Only make tsv's be undefined before the first trace run. After a | |
2858 | trace run is over, the user might want to see the last value of | |
2859 | the tsv, and it might not be available in a traceframe. */ | |
2860 | else if (!tracing && strcmp (tracing_stop_reason, "tnotrun") == 0) | |
2861 | { | |
2862 | strcpy (own_buf, "U"); | |
2863 | return; | |
2864 | } | |
2865 | else | |
2866 | val = get_trace_state_variable_value (num); | |
2867 | ||
2868 | sprintf (own_buf, "V%s", phex_nz (val, 0)); | |
2869 | } | |
2870 | ||
2871 | /* Clear out the list of readonly regions. */ | |
2872 | ||
2873 | static void | |
2874 | clear_readonly_regions (void) | |
2875 | { | |
2876 | struct readonly_region *roreg; | |
2877 | ||
2878 | while (readonly_regions) | |
2879 | { | |
2880 | roreg = readonly_regions; | |
2881 | readonly_regions = readonly_regions->next; | |
2882 | free (roreg); | |
2883 | } | |
2884 | } | |
2885 | ||
2886 | /* Parse the collection of address ranges whose contents GDB believes | |
2887 | to be unchanging and so can be read directly from target memory | |
2888 | even while looking at a traceframe. */ | |
2889 | ||
2890 | static void | |
2891 | cmd_qtro (char *own_buf) | |
2892 | { | |
2893 | ULONGEST start, end; | |
2894 | struct readonly_region *roreg; | |
2895 | char *packet = own_buf; | |
2896 | ||
2897 | trace_debug ("Want to mark readonly regions"); | |
2898 | ||
2899 | clear_readonly_regions (); | |
2900 | ||
2901 | packet += strlen ("QTro"); | |
2902 | ||
2903 | while (*packet == ':') | |
2904 | { | |
2905 | ++packet; /* skip a colon */ | |
2906 | packet = unpack_varlen_hex (packet, &start); | |
2907 | ++packet; /* skip a comma */ | |
2908 | packet = unpack_varlen_hex (packet, &end); | |
2909 | roreg = xmalloc (sizeof (struct readonly_region)); | |
2910 | roreg->start = start; | |
2911 | roreg->end = end; | |
2912 | roreg->next = readonly_regions; | |
2913 | readonly_regions = roreg; | |
2914 | trace_debug ("Added readonly region from 0x%s to 0x%s", | |
2915 | paddress (roreg->start), paddress (roreg->end)); | |
2916 | } | |
2917 | ||
2918 | write_ok (own_buf); | |
2919 | } | |
2920 | ||
2921 | /* Test to see if the given range is in our list of readonly ranges. | |
2922 | We only test for being entirely within a range, GDB is not going to | |
2923 | send a single memory packet that spans multiple regions. */ | |
2924 | ||
2925 | int | |
2926 | in_readonly_region (CORE_ADDR addr, ULONGEST length) | |
2927 | { | |
2928 | struct readonly_region *roreg; | |
2929 | ||
2930 | for (roreg = readonly_regions; roreg; roreg = roreg->next) | |
2931 | if (roreg->start <= addr && (addr + length - 1) <= roreg->end) | |
2932 | return 1; | |
2933 | ||
2934 | return 0; | |
2935 | } | |
2936 | ||
fa593d66 PA |
2937 | /* The maximum size of a jump pad entry. */ |
2938 | static const int max_jump_pad_size = 0x100; | |
2939 | ||
2940 | static CORE_ADDR gdb_jump_pad_head; | |
2941 | ||
2942 | /* Return the address of the next free jump space. */ | |
2943 | ||
2944 | static CORE_ADDR | |
2945 | get_jump_space_head (void) | |
2946 | { | |
2947 | if (gdb_jump_pad_head == 0) | |
2948 | { | |
2949 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer, | |
2950 | &gdb_jump_pad_head)) | |
38e08fca GB |
2951 | { |
2952 | internal_error (__FILE__, __LINE__, | |
2953 | "error extracting jump_pad_buffer"); | |
2954 | } | |
fa593d66 PA |
2955 | } |
2956 | ||
2957 | return gdb_jump_pad_head; | |
2958 | } | |
2959 | ||
2960 | /* Reserve USED bytes from the jump space. */ | |
2961 | ||
2962 | static void | |
2963 | claim_jump_space (ULONGEST used) | |
2964 | { | |
2965 | trace_debug ("claim_jump_space reserves %s bytes at %s", | |
2966 | pulongest (used), paddress (gdb_jump_pad_head)); | |
2967 | gdb_jump_pad_head += used; | |
2968 | } | |
2969 | ||
405f8e94 SS |
2970 | static CORE_ADDR trampoline_buffer_head = 0; |
2971 | static CORE_ADDR trampoline_buffer_tail; | |
2972 | ||
2973 | /* Reserve USED bytes from the trampoline buffer and return the | |
2974 | address of the start of the reserved space in TRAMPOLINE. Returns | |
2975 | non-zero if the space is successfully claimed. */ | |
2976 | ||
2977 | int | |
2978 | claim_trampoline_space (ULONGEST used, CORE_ADDR *trampoline) | |
2979 | { | |
2980 | if (!trampoline_buffer_head) | |
2981 | { | |
2982 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer, | |
2983 | &trampoline_buffer_tail)) | |
2984 | { | |
38e08fca GB |
2985 | internal_error (__FILE__, __LINE__, |
2986 | "error extracting trampoline_buffer"); | |
405f8e94 SS |
2987 | } |
2988 | ||
2989 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_end, | |
2990 | &trampoline_buffer_head)) | |
2991 | { | |
38e08fca GB |
2992 | internal_error (__FILE__, __LINE__, |
2993 | "error extracting trampoline_buffer_end"); | |
405f8e94 SS |
2994 | } |
2995 | } | |
2996 | ||
2997 | /* Start claiming space from the top of the trampoline space. If | |
2998 | the space is located at the bottom of the virtual address space, | |
2999 | this reduces the possibility that corruption will occur if a null | |
3000 | pointer is used to write to memory. */ | |
3001 | if (trampoline_buffer_head - trampoline_buffer_tail < used) | |
3002 | { | |
3003 | trace_debug ("claim_trampoline_space failed to reserve %s bytes", | |
3004 | pulongest (used)); | |
3005 | return 0; | |
3006 | } | |
3007 | ||
3008 | trampoline_buffer_head -= used; | |
3009 | ||
3010 | trace_debug ("claim_trampoline_space reserves %s bytes at %s", | |
3011 | pulongest (used), paddress (trampoline_buffer_head)); | |
3012 | ||
3013 | *trampoline = trampoline_buffer_head; | |
3014 | return 1; | |
3015 | } | |
3016 | ||
3017 | /* Returns non-zero if there is space allocated for use in trampolines | |
3018 | for fast tracepoints. */ | |
3019 | ||
3020 | int | |
3021 | have_fast_tracepoint_trampoline_buffer (char *buf) | |
3022 | { | |
3023 | CORE_ADDR trampoline_end, errbuf; | |
3024 | ||
3025 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_end, | |
3026 | &trampoline_end)) | |
3027 | { | |
38e08fca GB |
3028 | internal_error (__FILE__, __LINE__, |
3029 | "error extracting trampoline_buffer_end"); | |
405f8e94 SS |
3030 | } |
3031 | ||
3032 | if (buf) | |
3033 | { | |
3034 | buf[0] = '\0'; | |
3035 | strcpy (buf, "was claiming"); | |
3036 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_error, | |
3037 | &errbuf)) | |
3038 | { | |
38e08fca GB |
3039 | internal_error (__FILE__, __LINE__, |
3040 | "error extracting errbuf"); | |
405f8e94 SS |
3041 | } |
3042 | ||
3043 | read_inferior_memory (errbuf, (unsigned char *) buf, 100); | |
3044 | } | |
3045 | ||
3046 | return trampoline_end != 0; | |
3047 | } | |
3048 | ||
0fb4aa4b PA |
3049 | /* Ask the IPA to probe the marker at ADDRESS. Returns -1 if running |
3050 | the command fails, or 0 otherwise. If the command ran | |
3051 | successfully, but probing the marker failed, ERROUT will be filled | |
3052 | with the error to reply to GDB, and -1 is also returned. This | |
3053 | allows directly passing IPA errors to GDB. */ | |
3054 | ||
3055 | static int | |
3056 | probe_marker_at (CORE_ADDR address, char *errout) | |
3057 | { | |
2fa291ac | 3058 | char cmd[IPA_CMD_BUF_SIZE]; |
0fb4aa4b PA |
3059 | int err; |
3060 | ||
3061 | sprintf (cmd, "probe_marker_at:%s", paddress (address)); | |
42476b70 | 3062 | err = run_inferior_command (cmd, strlen (cmd) + 1); |
0fb4aa4b PA |
3063 | |
3064 | if (err == 0) | |
3065 | { | |
3066 | if (*cmd == 'E') | |
3067 | { | |
3068 | strcpy (errout, cmd); | |
3069 | return -1; | |
3070 | } | |
3071 | } | |
3072 | ||
3073 | return err; | |
3074 | } | |
3075 | ||
219f2f23 | 3076 | static void |
5c73ff4e | 3077 | clone_fast_tracepoint (struct tracepoint *to, const struct tracepoint *from) |
219f2f23 | 3078 | { |
5c73ff4e YQ |
3079 | to->jump_pad = from->jump_pad; |
3080 | to->jump_pad_end = from->jump_pad_end; | |
405f8e94 SS |
3081 | to->trampoline = from->trampoline; |
3082 | to->trampoline_end = from->trampoline_end; | |
5c73ff4e YQ |
3083 | to->adjusted_insn_addr = from->adjusted_insn_addr; |
3084 | to->adjusted_insn_addr_end = from->adjusted_insn_addr_end; | |
3085 | to->handle = from->handle; | |
fa593d66 | 3086 | |
5c73ff4e YQ |
3087 | gdb_assert (from->handle); |
3088 | inc_ref_fast_tracepoint_jump ((struct fast_tracepoint_jump *) from->handle); | |
3089 | } | |
3090 | ||
3091 | #define MAX_JUMP_SIZE 20 | |
3092 | ||
3093 | /* Install fast tracepoint. Return 0 if successful, otherwise return | |
3094 | non-zero. */ | |
3095 | ||
3096 | static int | |
405f8e94 | 3097 | install_fast_tracepoint (struct tracepoint *tpoint, char *errbuf) |
5c73ff4e YQ |
3098 | { |
3099 | CORE_ADDR jentry, jump_entry; | |
405f8e94 SS |
3100 | CORE_ADDR trampoline; |
3101 | ULONGEST trampoline_size; | |
5c73ff4e | 3102 | int err = 0; |
fa593d66 PA |
3103 | /* The jump to the jump pad of the last fast tracepoint |
3104 | installed. */ | |
3105 | unsigned char fjump[MAX_JUMP_SIZE]; | |
3106 | ULONGEST fjump_size; | |
219f2f23 | 3107 | |
405f8e94 SS |
3108 | if (tpoint->orig_size < target_get_min_fast_tracepoint_insn_len ()) |
3109 | { | |
3110 | trace_debug ("Requested a fast tracepoint on an instruction " | |
3111 | "that is of less than the minimum length."); | |
3112 | return 0; | |
3113 | } | |
3114 | ||
5c73ff4e YQ |
3115 | jentry = jump_entry = get_jump_space_head (); |
3116 | ||
405f8e94 SS |
3117 | trampoline = 0; |
3118 | trampoline_size = 0; | |
3119 | ||
5c73ff4e YQ |
3120 | /* Install the jump pad. */ |
3121 | err = install_fast_tracepoint_jump_pad (tpoint->obj_addr_on_target, | |
3122 | tpoint->address, | |
3123 | ipa_sym_addrs.addr_gdb_collect, | |
3124 | ipa_sym_addrs.addr_collecting, | |
3125 | tpoint->orig_size, | |
405f8e94 SS |
3126 | &jentry, |
3127 | &trampoline, &trampoline_size, | |
3128 | fjump, &fjump_size, | |
5c73ff4e | 3129 | &tpoint->adjusted_insn_addr, |
405f8e94 SS |
3130 | &tpoint->adjusted_insn_addr_end, |
3131 | errbuf); | |
5c73ff4e YQ |
3132 | |
3133 | if (err) | |
3134 | return 1; | |
3135 | ||
3136 | /* Wire it in. */ | |
3137 | tpoint->handle = set_fast_tracepoint_jump (tpoint->address, fjump, | |
3138 | fjump_size); | |
3139 | ||
3140 | if (tpoint->handle != NULL) | |
3141 | { | |
3142 | tpoint->jump_pad = jump_entry; | |
3143 | tpoint->jump_pad_end = jentry; | |
405f8e94 SS |
3144 | tpoint->trampoline = trampoline; |
3145 | tpoint->trampoline_end = trampoline + trampoline_size; | |
5c73ff4e YQ |
3146 | |
3147 | /* Pad to 8-byte alignment. */ | |
3148 | jentry = ((jentry + 7) & ~0x7); | |
3149 | claim_jump_space (jentry - jump_entry); | |
3150 | } | |
3151 | ||
3152 | return 0; | |
3153 | } | |
3154 | ||
1e4d1764 YQ |
3155 | |
3156 | /* Install tracepoint TPOINT, and write reply message in OWN_BUF. */ | |
3157 | ||
3158 | static void | |
3159 | install_tracepoint (struct tracepoint *tpoint, char *own_buf) | |
3160 | { | |
3161 | tpoint->handle = NULL; | |
3162 | *own_buf = '\0'; | |
3163 | ||
3164 | if (tpoint->type == trap_tracepoint) | |
3165 | { | |
3166 | /* Tracepoints are installed as memory breakpoints. Just go | |
3167 | ahead and install the trap. The breakpoints module | |
3168 | handles duplicated breakpoints, and the memory read | |
3169 | routine handles un-patching traps from memory reads. */ | |
3170 | tpoint->handle = set_breakpoint_at (tpoint->address, | |
3171 | tracepoint_handler); | |
3172 | } | |
3173 | else if (tpoint->type == fast_tracepoint || tpoint->type == static_tracepoint) | |
3174 | { | |
58b4daa5 | 3175 | if (!agent_loaded_p ()) |
1e4d1764 YQ |
3176 | { |
3177 | trace_debug ("Requested a %s tracepoint, but fast " | |
3178 | "tracepoints aren't supported.", | |
3179 | tpoint->type == static_tracepoint ? "static" : "fast"); | |
3180 | write_e_ipa_not_loaded (own_buf); | |
3181 | return; | |
3182 | } | |
8ffcbaaf YQ |
3183 | if (tpoint->type == static_tracepoint |
3184 | && !in_process_agent_supports_ust ()) | |
1e4d1764 YQ |
3185 | { |
3186 | trace_debug ("Requested a static tracepoint, but static " | |
3187 | "tracepoints are not supported."); | |
3188 | write_e_ust_not_loaded (own_buf); | |
3189 | return; | |
3190 | } | |
3191 | ||
1e4d1764 | 3192 | if (tpoint->type == fast_tracepoint) |
fc3e5175 | 3193 | install_fast_tracepoint (tpoint, own_buf); |
1e4d1764 YQ |
3194 | else |
3195 | { | |
fc3e5175 | 3196 | if (probe_marker_at (tpoint->address, own_buf) == 0) |
1e4d1764 | 3197 | tpoint->handle = (void *) -1; |
1e4d1764 YQ |
3198 | } |
3199 | ||
3200 | } | |
3201 | else | |
3202 | internal_error (__FILE__, __LINE__, "Unknown tracepoint type"); | |
3203 | ||
3204 | if (tpoint->handle == NULL) | |
3205 | { | |
3206 | if (*own_buf == '\0') | |
3207 | write_enn (own_buf); | |
3208 | } | |
3209 | else | |
3210 | write_ok (own_buf); | |
3211 | } | |
3212 | ||
7bc83639 YQ |
3213 | static void download_tracepoint_1 (struct tracepoint *tpoint); |
3214 | ||
5c73ff4e YQ |
3215 | static void |
3216 | cmd_qtstart (char *packet) | |
3217 | { | |
3218 | struct tracepoint *tpoint, *prev_ftpoint, *prev_stpoint; | |
7bc83639 | 3219 | CORE_ADDR tpptr = 0, prev_tpptr = 0; |
5c73ff4e | 3220 | |
219f2f23 PA |
3221 | trace_debug ("Starting the trace"); |
3222 | ||
7984d532 | 3223 | /* Pause all threads temporarily while we patch tracepoints. */ |
fa593d66 PA |
3224 | pause_all (0); |
3225 | ||
3226 | /* Get threads out of jump pads. Safe to do here, since this is a | |
3227 | top level command. And, required to do here, since we're | |
3228 | deleting/rewriting jump pads. */ | |
3229 | ||
3230 | stabilize_threads (); | |
3231 | ||
3232 | /* Freeze threads. */ | |
7984d532 PA |
3233 | pause_all (1); |
3234 | ||
fa593d66 | 3235 | /* Sync the fast tracepoints list in the inferior ftlib. */ |
58b4daa5 | 3236 | if (agent_loaded_p ()) |
7bc83639 | 3237 | download_trace_state_variables (); |
fa593d66 PA |
3238 | |
3239 | /* No previous fast tpoint yet. */ | |
3240 | prev_ftpoint = NULL; | |
3241 | ||
0fb4aa4b PA |
3242 | /* No previous static tpoint yet. */ |
3243 | prev_stpoint = NULL; | |
3244 | ||
fa593d66 PA |
3245 | *packet = '\0'; |
3246 | ||
7bc83639 YQ |
3247 | /* Start out empty. */ |
3248 | if (agent_loaded_p ()) | |
3249 | write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints, 0); | |
3250 | ||
3251 | /* Download and install tracepoints. */ | |
219f2f23 PA |
3252 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) |
3253 | { | |
3254 | /* Ensure all the hit counts start at zero. */ | |
3255 | tpoint->hit_count = 0; | |
f196051f | 3256 | tpoint->traceframe_usage = 0; |
219f2f23 | 3257 | |
fa593d66 PA |
3258 | if (tpoint->type == trap_tracepoint) |
3259 | { | |
fa593d66 PA |
3260 | /* Tracepoints are installed as memory breakpoints. Just go |
3261 | ahead and install the trap. The breakpoints module | |
3262 | handles duplicated breakpoints, and the memory read | |
3263 | routine handles un-patching traps from memory reads. */ | |
3264 | tpoint->handle = set_breakpoint_at (tpoint->address, | |
3265 | tracepoint_handler); | |
3266 | } | |
7bc83639 YQ |
3267 | else if (tpoint->type == fast_tracepoint |
3268 | || tpoint->type == static_tracepoint) | |
fa593d66 | 3269 | { |
fa593d66 PA |
3270 | if (maybe_write_ipa_not_loaded (packet)) |
3271 | { | |
7bc83639 YQ |
3272 | trace_debug ("Requested a %s tracepoint, but fast " |
3273 | "tracepoints aren't supported.", | |
3274 | tpoint->type == static_tracepoint | |
3275 | ? "static" : "fast"); | |
fa593d66 PA |
3276 | break; |
3277 | } | |
3278 | ||
7bc83639 | 3279 | if (tpoint->type == fast_tracepoint) |
0fb4aa4b | 3280 | { |
80d26939 YQ |
3281 | int use_agent_p |
3282 | = use_agent && agent_capability_check (AGENT_CAPA_FAST_TRACE); | |
3283 | ||
7bc83639 YQ |
3284 | if (prev_ftpoint != NULL |
3285 | && prev_ftpoint->address == tpoint->address) | |
80d26939 YQ |
3286 | { |
3287 | if (use_agent_p) | |
3288 | tracepoint_send_agent (tpoint); | |
3289 | else | |
3290 | download_tracepoint_1 (tpoint); | |
3291 | ||
3292 | clone_fast_tracepoint (tpoint, prev_ftpoint); | |
3293 | } | |
7bc83639 YQ |
3294 | else |
3295 | { | |
42476b70 YQ |
3296 | /* Tracepoint is installed successfully? */ |
3297 | int installed = 0; | |
3298 | ||
3299 | /* Download and install fast tracepoint by agent. */ | |
80d26939 | 3300 | if (use_agent_p) |
42476b70 YQ |
3301 | installed = !tracepoint_send_agent (tpoint); |
3302 | else | |
3303 | { | |
3304 | download_tracepoint_1 (tpoint); | |
3305 | installed = !install_fast_tracepoint (tpoint, packet); | |
3306 | } | |
3307 | ||
3308 | if (installed) | |
7bc83639 YQ |
3309 | prev_ftpoint = tpoint; |
3310 | } | |
0fb4aa4b PA |
3311 | } |
3312 | else | |
3313 | { | |
7bc83639 | 3314 | if (!in_process_agent_supports_ust ()) |
0fb4aa4b | 3315 | { |
7bc83639 YQ |
3316 | trace_debug ("Requested a static tracepoint, but static " |
3317 | "tracepoints are not supported."); | |
3318 | break; | |
3319 | } | |
0fb4aa4b | 3320 | |
7bc83639 YQ |
3321 | download_tracepoint_1 (tpoint); |
3322 | /* Can only probe a given marker once. */ | |
3323 | if (prev_stpoint != NULL | |
3324 | && prev_stpoint->address == tpoint->address) | |
3325 | tpoint->handle = (void *) -1; | |
3326 | else | |
3327 | { | |
3328 | if (probe_marker_at (tpoint->address, packet) == 0) | |
3329 | { | |
3330 | tpoint->handle = (void *) -1; | |
3331 | ||
3332 | /* So that we can handle multiple static tracepoints | |
3333 | at the same address easily. */ | |
3334 | prev_stpoint = tpoint; | |
3335 | } | |
0fb4aa4b PA |
3336 | } |
3337 | } | |
7bc83639 YQ |
3338 | |
3339 | prev_tpptr = tpptr; | |
3340 | tpptr = tpoint->obj_addr_on_target; | |
3341 | ||
3342 | if (tpoint == tracepoints) | |
3343 | /* First object in list, set the head pointer in the | |
3344 | inferior. */ | |
3345 | write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints, tpptr); | |
3346 | else | |
3347 | write_inferior_data_ptr (prev_tpptr + offsetof (struct tracepoint, | |
3348 | next), | |
3349 | tpptr); | |
0fb4aa4b | 3350 | } |
fa593d66 PA |
3351 | |
3352 | /* Any failure in the inner loop is sufficient cause to give | |
3353 | up. */ | |
219f2f23 PA |
3354 | if (tpoint->handle == NULL) |
3355 | break; | |
3356 | } | |
3357 | ||
3358 | /* Any error in tracepoint insertion is unacceptable; better to | |
3359 | address the problem now, than end up with a useless or misleading | |
3360 | trace run. */ | |
3361 | if (tpoint != NULL) | |
3362 | { | |
3363 | clear_installed_tracepoints (); | |
3364 | if (*packet == '\0') | |
3365 | write_enn (packet); | |
7984d532 | 3366 | unpause_all (1); |
219f2f23 PA |
3367 | return; |
3368 | } | |
3369 | ||
3370 | stopping_tracepoint = NULL; | |
3371 | trace_buffer_is_full = 0; | |
3372 | expr_eval_result = expr_eval_no_error; | |
3373 | error_tracepoint = NULL; | |
f196051f | 3374 | tracing_start_time = get_timestamp (); |
219f2f23 PA |
3375 | |
3376 | /* Tracing is now active, hits will now start being logged. */ | |
3377 | tracing = 1; | |
3378 | ||
58b4daa5 | 3379 | if (agent_loaded_p ()) |
fa593d66 PA |
3380 | { |
3381 | if (write_inferior_integer (ipa_sym_addrs.addr_tracing, 1)) | |
38e08fca GB |
3382 | { |
3383 | internal_error (__FILE__, __LINE__, | |
3384 | "Error setting tracing variable in lib"); | |
3385 | } | |
fa593d66 PA |
3386 | |
3387 | if (write_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, | |
3388 | 0)) | |
38e08fca GB |
3389 | { |
3390 | internal_error (__FILE__, __LINE__, | |
3391 | "Error clearing stopping_tracepoint variable" | |
3392 | " in lib"); | |
3393 | } | |
fa593d66 PA |
3394 | |
3395 | if (write_inferior_integer (ipa_sym_addrs.addr_trace_buffer_is_full, 0)) | |
38e08fca GB |
3396 | { |
3397 | internal_error (__FILE__, __LINE__, | |
3398 | "Error clearing trace_buffer_is_full variable" | |
3399 | " in lib"); | |
3400 | } | |
fa593d66 PA |
3401 | |
3402 | stop_tracing_bkpt = set_breakpoint_at (ipa_sym_addrs.addr_stop_tracing, | |
3403 | stop_tracing_handler); | |
3404 | if (stop_tracing_bkpt == NULL) | |
3405 | error ("Error setting stop_tracing breakpoint"); | |
3406 | ||
3407 | flush_trace_buffer_bkpt | |
3408 | = set_breakpoint_at (ipa_sym_addrs.addr_flush_trace_buffer, | |
3409 | flush_trace_buffer_handler); | |
3410 | if (flush_trace_buffer_bkpt == NULL) | |
3411 | error ("Error setting flush_trace_buffer breakpoint"); | |
3412 | } | |
3413 | ||
7984d532 PA |
3414 | unpause_all (1); |
3415 | ||
219f2f23 PA |
3416 | write_ok (packet); |
3417 | } | |
3418 | ||
3419 | /* End a tracing run, filling in a stop reason to report back to GDB, | |
3420 | and removing the tracepoints from the code. */ | |
3421 | ||
8336d594 | 3422 | void |
219f2f23 PA |
3423 | stop_tracing (void) |
3424 | { | |
3425 | if (!tracing) | |
3426 | { | |
3427 | trace_debug ("Tracing is already off, ignoring"); | |
3428 | return; | |
3429 | } | |
3430 | ||
3431 | trace_debug ("Stopping the trace"); | |
3432 | ||
fa593d66 PA |
3433 | /* Pause all threads before removing fast jumps from memory, |
3434 | breakpoints, and touching IPA state variables (inferior memory). | |
3435 | Some thread may hit the internal tracing breakpoints, or be | |
3436 | collecting this moment, but that's ok, we don't release the | |
3437 | tpoint object's memory or the jump pads here (we only do that | |
3438 | when we're sure we can move all threads out of the jump pads). | |
3439 | We can't now, since we may be getting here due to the inferior | |
3440 | agent calling us. */ | |
7984d532 | 3441 | pause_all (1); |
7984d532 | 3442 | |
219f2f23 PA |
3443 | /* Stop logging. Tracepoints can still be hit, but they will not be |
3444 | recorded. */ | |
3445 | tracing = 0; | |
58b4daa5 | 3446 | if (agent_loaded_p ()) |
fa593d66 PA |
3447 | { |
3448 | if (write_inferior_integer (ipa_sym_addrs.addr_tracing, 0)) | |
38e08fca GB |
3449 | { |
3450 | internal_error (__FILE__, __LINE__, | |
3451 | "Error clearing tracing variable in lib"); | |
3452 | } | |
fa593d66 | 3453 | } |
219f2f23 | 3454 | |
f196051f | 3455 | tracing_stop_time = get_timestamp (); |
219f2f23 PA |
3456 | tracing_stop_reason = "t???"; |
3457 | tracing_stop_tpnum = 0; | |
3458 | if (stopping_tracepoint) | |
3459 | { | |
3460 | trace_debug ("Stopping the trace because " | |
5f18041e | 3461 | "tracepoint %d was hit %" PRIu64 " times", |
219f2f23 PA |
3462 | stopping_tracepoint->number, |
3463 | stopping_tracepoint->pass_count); | |
3464 | tracing_stop_reason = "tpasscount"; | |
3465 | tracing_stop_tpnum = stopping_tracepoint->number; | |
3466 | } | |
3467 | else if (trace_buffer_is_full) | |
3468 | { | |
3469 | trace_debug ("Stopping the trace because the trace buffer is full"); | |
3470 | tracing_stop_reason = "tfull"; | |
3471 | } | |
3472 | else if (expr_eval_result != expr_eval_no_error) | |
3473 | { | |
3474 | trace_debug ("Stopping the trace because of an expression eval error"); | |
3475 | tracing_stop_reason = eval_result_names[expr_eval_result]; | |
3476 | tracing_stop_tpnum = error_tracepoint->number; | |
3477 | } | |
fa593d66 | 3478 | #ifndef IN_PROCESS_AGENT |
8336d594 PA |
3479 | else if (!gdb_connected ()) |
3480 | { | |
3481 | trace_debug ("Stopping the trace because GDB disconnected"); | |
3482 | tracing_stop_reason = "tdisconnected"; | |
3483 | } | |
fa593d66 | 3484 | #endif |
219f2f23 PA |
3485 | else |
3486 | { | |
3487 | trace_debug ("Stopping the trace because of a tstop command"); | |
3488 | tracing_stop_reason = "tstop"; | |
3489 | } | |
3490 | ||
3491 | stopping_tracepoint = NULL; | |
3492 | error_tracepoint = NULL; | |
3493 | ||
3494 | /* Clear out the tracepoints. */ | |
3495 | clear_installed_tracepoints (); | |
7984d532 | 3496 | |
58b4daa5 | 3497 | if (agent_loaded_p ()) |
fa593d66 PA |
3498 | { |
3499 | /* Pull in fast tracepoint trace frames from the inferior lib | |
3500 | buffer into our buffer, even if our buffer is already full, | |
3501 | because we want to present the full number of created frames | |
3502 | in addition to what fit in the trace buffer. */ | |
3503 | upload_fast_traceframes (); | |
3504 | } | |
3505 | ||
3506 | if (stop_tracing_bkpt != NULL) | |
3507 | { | |
3508 | delete_breakpoint (stop_tracing_bkpt); | |
3509 | stop_tracing_bkpt = NULL; | |
3510 | } | |
3511 | ||
3512 | if (flush_trace_buffer_bkpt != NULL) | |
3513 | { | |
3514 | delete_breakpoint (flush_trace_buffer_bkpt); | |
3515 | flush_trace_buffer_bkpt = NULL; | |
3516 | } | |
3517 | ||
7984d532 | 3518 | unpause_all (1); |
219f2f23 PA |
3519 | } |
3520 | ||
fa593d66 PA |
3521 | static int |
3522 | stop_tracing_handler (CORE_ADDR addr) | |
3523 | { | |
3524 | trace_debug ("lib hit stop_tracing"); | |
3525 | ||
3526 | /* Don't actually handle it here. When we stop tracing we remove | |
3527 | breakpoints from the inferior, and that is not allowed in a | |
3528 | breakpoint handler (as the caller is walking the breakpoint | |
3529 | list). */ | |
3530 | return 0; | |
3531 | } | |
3532 | ||
3533 | static int | |
3534 | flush_trace_buffer_handler (CORE_ADDR addr) | |
3535 | { | |
3536 | trace_debug ("lib hit flush_trace_buffer"); | |
3537 | return 0; | |
3538 | } | |
3539 | ||
219f2f23 PA |
3540 | static void |
3541 | cmd_qtstop (char *packet) | |
3542 | { | |
3543 | stop_tracing (); | |
3544 | write_ok (packet); | |
3545 | } | |
3546 | ||
8336d594 PA |
3547 | static void |
3548 | cmd_qtdisconnected (char *own_buf) | |
3549 | { | |
3550 | ULONGEST setting; | |
3551 | char *packet = own_buf; | |
3552 | ||
3553 | packet += strlen ("QTDisconnected:"); | |
3554 | ||
3555 | unpack_varlen_hex (packet, &setting); | |
3556 | ||
3557 | write_ok (own_buf); | |
3558 | ||
3559 | disconnected_tracing = setting; | |
3560 | } | |
3561 | ||
219f2f23 PA |
3562 | static void |
3563 | cmd_qtframe (char *own_buf) | |
3564 | { | |
3565 | ULONGEST frame, pc, lo, hi, num; | |
3566 | int tfnum, tpnum; | |
3567 | struct traceframe *tframe; | |
3568 | char *packet = own_buf; | |
3569 | ||
3570 | packet += strlen ("QTFrame:"); | |
3571 | ||
3572 | if (strncmp (packet, "pc:", strlen ("pc:")) == 0) | |
3573 | { | |
3574 | packet += strlen ("pc:"); | |
f8f67713 | 3575 | unpack_varlen_hex (packet, &pc); |
219f2f23 PA |
3576 | trace_debug ("Want to find next traceframe at pc=0x%s", paddress (pc)); |
3577 | tframe = find_next_traceframe_in_range (pc, pc, 1, &tfnum); | |
3578 | } | |
3579 | else if (strncmp (packet, "range:", strlen ("range:")) == 0) | |
3580 | { | |
3581 | packet += strlen ("range:"); | |
3582 | packet = unpack_varlen_hex (packet, &lo); | |
3583 | ++packet; | |
f8f67713 | 3584 | unpack_varlen_hex (packet, &hi); |
219f2f23 PA |
3585 | trace_debug ("Want to find next traceframe in the range 0x%s to 0x%s", |
3586 | paddress (lo), paddress (hi)); | |
3587 | tframe = find_next_traceframe_in_range (lo, hi, 1, &tfnum); | |
3588 | } | |
3589 | else if (strncmp (packet, "outside:", strlen ("outside:")) == 0) | |
3590 | { | |
3591 | packet += strlen ("outside:"); | |
3592 | packet = unpack_varlen_hex (packet, &lo); | |
3593 | ++packet; | |
f8f67713 | 3594 | unpack_varlen_hex (packet, &hi); |
219f2f23 PA |
3595 | trace_debug ("Want to find next traceframe " |
3596 | "outside the range 0x%s to 0x%s", | |
3597 | paddress (lo), paddress (hi)); | |
3598 | tframe = find_next_traceframe_in_range (lo, hi, 0, &tfnum); | |
3599 | } | |
3600 | else if (strncmp (packet, "tdp:", strlen ("tdp:")) == 0) | |
3601 | { | |
3602 | packet += strlen ("tdp:"); | |
f8f67713 | 3603 | unpack_varlen_hex (packet, &num); |
219f2f23 PA |
3604 | tpnum = (int) num; |
3605 | trace_debug ("Want to find next traceframe for tracepoint %d", tpnum); | |
3606 | tframe = find_next_traceframe_by_tracepoint (tpnum, &tfnum); | |
3607 | } | |
3608 | else | |
3609 | { | |
3610 | unpack_varlen_hex (packet, &frame); | |
3611 | tfnum = (int) frame; | |
3612 | if (tfnum == -1) | |
3613 | { | |
3614 | trace_debug ("Want to stop looking at traceframes"); | |
3615 | current_traceframe = -1; | |
3616 | write_ok (own_buf); | |
3617 | return; | |
3618 | } | |
3619 | trace_debug ("Want to look at traceframe %d", tfnum); | |
3620 | tframe = find_traceframe (tfnum); | |
3621 | } | |
3622 | ||
3623 | if (tframe) | |
3624 | { | |
3625 | current_traceframe = tfnum; | |
3626 | sprintf (own_buf, "F%xT%x", tfnum, tframe->tpnum); | |
3627 | } | |
3628 | else | |
3629 | sprintf (own_buf, "F-1"); | |
3630 | } | |
3631 | ||
3632 | static void | |
3633 | cmd_qtstatus (char *packet) | |
3634 | { | |
3635 | char *stop_reason_rsp = NULL; | |
f196051f SS |
3636 | char *buf1, *buf2, *buf3, *str; |
3637 | int slen; | |
3638 | ||
3639 | /* Translate the plain text of the notes back into hex for | |
3640 | transmission. */ | |
3641 | ||
3642 | str = (tracing_user_name ? tracing_user_name : ""); | |
3643 | slen = strlen (str); | |
3644 | buf1 = (char *) alloca (slen * 2 + 1); | |
971dc0b8 | 3645 | bin2hex ((gdb_byte *) str, buf1, slen); |
f196051f SS |
3646 | |
3647 | str = (tracing_notes ? tracing_notes : ""); | |
3648 | slen = strlen (str); | |
3649 | buf2 = (char *) alloca (slen * 2 + 1); | |
971dc0b8 | 3650 | bin2hex ((gdb_byte *) str, buf2, slen); |
f196051f SS |
3651 | |
3652 | str = (tracing_stop_note ? tracing_stop_note : ""); | |
3653 | slen = strlen (str); | |
3654 | buf3 = (char *) alloca (slen * 2 + 1); | |
971dc0b8 | 3655 | bin2hex ((gdb_byte *) str, buf3, slen); |
219f2f23 PA |
3656 | |
3657 | trace_debug ("Returning trace status as %d, stop reason %s", | |
3658 | tracing, tracing_stop_reason); | |
3659 | ||
58b4daa5 | 3660 | if (agent_loaded_p ()) |
fa593d66 PA |
3661 | { |
3662 | pause_all (1); | |
3663 | ||
3664 | upload_fast_traceframes (); | |
3665 | ||
3666 | unpause_all (1); | |
3667 | } | |
3668 | ||
219f2f23 PA |
3669 | stop_reason_rsp = (char *) tracing_stop_reason; |
3670 | ||
3671 | /* The user visible error string in terror needs to be hex encoded. | |
f196051f | 3672 | We leave it as plain string in `tracing_stop_reason' to ease |
219f2f23 PA |
3673 | debugging. */ |
3674 | if (strncmp (stop_reason_rsp, "terror:", strlen ("terror:")) == 0) | |
3675 | { | |
3676 | const char *result_name; | |
3677 | int hexstr_len; | |
3678 | char *p; | |
3679 | ||
3680 | result_name = stop_reason_rsp + strlen ("terror:"); | |
3681 | hexstr_len = strlen (result_name) * 2; | |
3682 | p = stop_reason_rsp = alloca (strlen ("terror:") + hexstr_len + 1); | |
3683 | strcpy (p, "terror:"); | |
3684 | p += strlen (p); | |
e9371aff | 3685 | bin2hex ((gdb_byte *) result_name, p, strlen (result_name)); |
219f2f23 PA |
3686 | } |
3687 | ||
f196051f SS |
3688 | /* If this was a forced stop, include any stop note that was supplied. */ |
3689 | if (strcmp (stop_reason_rsp, "tstop") == 0) | |
3690 | { | |
3691 | stop_reason_rsp = alloca (strlen ("tstop:") + strlen (buf3) + 1); | |
3692 | strcpy (stop_reason_rsp, "tstop:"); | |
3693 | strcat (stop_reason_rsp, buf3); | |
3694 | } | |
3695 | ||
8336d594 PA |
3696 | sprintf (packet, |
3697 | "T%d;" | |
3698 | "%s:%x;" | |
3699 | "tframes:%x;tcreated:%x;" | |
3700 | "tfree:%x;tsize:%s;" | |
3701 | "circular:%d;" | |
f196051f | 3702 | "disconn:%d;" |
242f5f1c | 3703 | "starttime:%s;stoptime:%s;" |
86ebe149 | 3704 | "username:%s;notes:%s:", |
623ccd72 | 3705 | tracing ? 1 : 0, |
219f2f23 PA |
3706 | stop_reason_rsp, tracing_stop_tpnum, |
3707 | traceframe_count, traceframes_created, | |
8336d594 PA |
3708 | free_space (), phex_nz (trace_buffer_hi - trace_buffer_lo, 0), |
3709 | circular_trace_buffer, | |
f196051f | 3710 | disconnected_tracing, |
f30aa5af DK |
3711 | phex_nz (tracing_start_time, sizeof (tracing_start_time)), |
3712 | phex_nz (tracing_stop_time, sizeof (tracing_stop_time)), | |
f196051f SS |
3713 | buf1, buf2); |
3714 | } | |
3715 | ||
3716 | static void | |
3717 | cmd_qtp (char *own_buf) | |
3718 | { | |
3719 | ULONGEST num, addr; | |
3720 | struct tracepoint *tpoint; | |
3721 | char *packet = own_buf; | |
3722 | ||
3723 | packet += strlen ("qTP:"); | |
3724 | ||
3725 | packet = unpack_varlen_hex (packet, &num); | |
3726 | ++packet; /* skip a colon */ | |
3727 | packet = unpack_varlen_hex (packet, &addr); | |
3728 | ||
3729 | /* See if we already have this tracepoint. */ | |
3730 | tpoint = find_tracepoint (num, addr); | |
3731 | ||
3732 | if (!tpoint) | |
3733 | { | |
3734 | trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found", | |
3735 | (int) num, paddress (addr)); | |
3736 | write_enn (own_buf); | |
3737 | return; | |
3738 | } | |
3739 | ||
5f18041e YQ |
3740 | sprintf (own_buf, "V%" PRIu64 ":%" PRIu64 "", tpoint->hit_count, |
3741 | tpoint->traceframe_usage); | |
219f2f23 PA |
3742 | } |
3743 | ||
3744 | /* State variables to help return all the tracepoint bits. */ | |
3745 | static struct tracepoint *cur_tpoint; | |
e64f7499 YQ |
3746 | static unsigned int cur_action; |
3747 | static unsigned int cur_step_action; | |
219f2f23 PA |
3748 | static struct source_string *cur_source_string; |
3749 | static struct trace_state_variable *cur_tsv; | |
3750 | ||
3751 | /* Compose a response that is an imitation of the syntax by which the | |
3752 | tracepoint was originally downloaded. */ | |
3753 | ||
3754 | static void | |
3755 | response_tracepoint (char *packet, struct tracepoint *tpoint) | |
3756 | { | |
3757 | char *buf; | |
3758 | ||
5f18041e | 3759 | sprintf (packet, "T%x:%s:%c:%" PRIx64 ":%" PRIx64, tpoint->number, |
219f2f23 PA |
3760 | paddress (tpoint->address), |
3761 | (tpoint->enabled ? 'E' : 'D'), tpoint->step_count, | |
3762 | tpoint->pass_count); | |
fa593d66 PA |
3763 | if (tpoint->type == fast_tracepoint) |
3764 | sprintf (packet + strlen (packet), ":F%x", tpoint->orig_size); | |
0fb4aa4b PA |
3765 | else if (tpoint->type == static_tracepoint) |
3766 | sprintf (packet + strlen (packet), ":S"); | |
219f2f23 PA |
3767 | |
3768 | if (tpoint->cond) | |
3769 | { | |
5e1dc496 | 3770 | buf = gdb_unparse_agent_expr (tpoint->cond); |
219f2f23 PA |
3771 | sprintf (packet + strlen (packet), ":X%x,%s", |
3772 | tpoint->cond->length, buf); | |
3773 | free (buf); | |
3774 | } | |
3775 | } | |
3776 | ||
3777 | /* Compose a response that is an imitation of the syntax by which the | |
3778 | tracepoint action was originally downloaded (with the difference | |
3779 | that due to the way we store the actions, this will output a packet | |
3780 | per action, while GDB could have combined more than one action | |
3781 | per-packet. */ | |
3782 | ||
3783 | static void | |
3784 | response_action (char *packet, struct tracepoint *tpoint, | |
3785 | char *taction, int step) | |
3786 | { | |
3787 | sprintf (packet, "%c%x:%s:%s", | |
3788 | (step ? 'S' : 'A'), tpoint->number, paddress (tpoint->address), | |
3789 | taction); | |
3790 | } | |
3791 | ||
3792 | /* Compose a response that is an imitation of the syntax by which the | |
3793 | tracepoint source piece was originally downloaded. */ | |
3794 | ||
3795 | static void | |
3796 | response_source (char *packet, | |
3797 | struct tracepoint *tpoint, struct source_string *src) | |
3798 | { | |
3799 | char *buf; | |
3800 | int len; | |
3801 | ||
3802 | len = strlen (src->str); | |
3803 | buf = alloca (len * 2 + 1); | |
e9371aff | 3804 | bin2hex ((gdb_byte *) src->str, buf, len); |
219f2f23 PA |
3805 | |
3806 | sprintf (packet, "Z%x:%s:%s:%x:%x:%s", | |
3807 | tpoint->number, paddress (tpoint->address), | |
3808 | src->type, 0, len, buf); | |
3809 | } | |
3810 | ||
3811 | /* Return the first piece of tracepoint definition, and initialize the | |
3812 | state machine that will iterate through all the tracepoint | |
3813 | bits. */ | |
3814 | ||
3815 | static void | |
3816 | cmd_qtfp (char *packet) | |
3817 | { | |
3818 | trace_debug ("Returning first tracepoint definition piece"); | |
3819 | ||
3820 | cur_tpoint = tracepoints; | |
e64f7499 | 3821 | cur_action = cur_step_action = 0; |
219f2f23 PA |
3822 | cur_source_string = NULL; |
3823 | ||
3824 | if (cur_tpoint) | |
3825 | response_tracepoint (packet, cur_tpoint); | |
3826 | else | |
3827 | strcpy (packet, "l"); | |
3828 | } | |
3829 | ||
3830 | /* Return additional pieces of tracepoint definition. Each action and | |
3831 | stepping action must go into its own packet, because of packet size | |
3832 | limits, and so we use state variables to deliver one piece at a | |
3833 | time. */ | |
3834 | ||
3835 | static void | |
3836 | cmd_qtsp (char *packet) | |
3837 | { | |
3838 | trace_debug ("Returning subsequent tracepoint definition piece"); | |
3839 | ||
3840 | if (!cur_tpoint) | |
3841 | { | |
3842 | /* This case would normally never occur, but be prepared for | |
3843 | GDB misbehavior. */ | |
3844 | strcpy (packet, "l"); | |
3845 | } | |
e64f7499 | 3846 | else if (cur_action < cur_tpoint->numactions) |
219f2f23 | 3847 | { |
219f2f23 PA |
3848 | response_action (packet, cur_tpoint, |
3849 | cur_tpoint->actions_str[cur_action], 0); | |
e64f7499 | 3850 | ++cur_action; |
219f2f23 | 3851 | } |
e64f7499 | 3852 | else if (cur_step_action < cur_tpoint->num_step_actions) |
219f2f23 | 3853 | { |
219f2f23 PA |
3854 | response_action (packet, cur_tpoint, |
3855 | cur_tpoint->step_actions_str[cur_step_action], 1); | |
e64f7499 | 3856 | ++cur_step_action; |
219f2f23 PA |
3857 | } |
3858 | else if ((cur_source_string | |
3859 | ? cur_source_string->next | |
3860 | : cur_tpoint->source_strings)) | |
3861 | { | |
3862 | if (cur_source_string) | |
3863 | cur_source_string = cur_source_string->next; | |
3864 | else | |
3865 | cur_source_string = cur_tpoint->source_strings; | |
3866 | response_source (packet, cur_tpoint, cur_source_string); | |
3867 | } | |
3868 | else | |
3869 | { | |
3870 | cur_tpoint = cur_tpoint->next; | |
e64f7499 | 3871 | cur_action = cur_step_action = 0; |
219f2f23 PA |
3872 | cur_source_string = NULL; |
3873 | if (cur_tpoint) | |
3874 | response_tracepoint (packet, cur_tpoint); | |
3875 | else | |
3876 | strcpy (packet, "l"); | |
3877 | } | |
3878 | } | |
3879 | ||
3880 | /* Compose a response that is an imitation of the syntax by which the | |
3881 | trace state variable was originally downloaded. */ | |
3882 | ||
3883 | static void | |
3884 | response_tsv (char *packet, struct trace_state_variable *tsv) | |
3885 | { | |
3886 | char *buf = (char *) ""; | |
3887 | int namelen; | |
3888 | ||
3889 | if (tsv->name) | |
3890 | { | |
3891 | namelen = strlen (tsv->name); | |
3892 | buf = alloca (namelen * 2 + 1); | |
e9371aff | 3893 | bin2hex ((gdb_byte *) tsv->name, buf, namelen); |
219f2f23 PA |
3894 | } |
3895 | ||
3896 | sprintf (packet, "%x:%s:%x:%s", tsv->number, phex_nz (tsv->initial_value, 0), | |
3897 | tsv->getter ? 1 : 0, buf); | |
3898 | } | |
3899 | ||
3900 | /* Return the first trace state variable definition, and initialize | |
3901 | the state machine that will iterate through all the tsv bits. */ | |
3902 | ||
3903 | static void | |
3904 | cmd_qtfv (char *packet) | |
3905 | { | |
3906 | trace_debug ("Returning first trace state variable definition"); | |
3907 | ||
3908 | cur_tsv = trace_state_variables; | |
3909 | ||
3910 | if (cur_tsv) | |
3911 | response_tsv (packet, cur_tsv); | |
3912 | else | |
3913 | strcpy (packet, "l"); | |
3914 | } | |
3915 | ||
3916 | /* Return additional trace state variable definitions. */ | |
3917 | ||
3918 | static void | |
3919 | cmd_qtsv (char *packet) | |
3920 | { | |
918d227b | 3921 | trace_debug ("Returning additional trace state variable definition"); |
219f2f23 | 3922 | |
918d227b | 3923 | if (cur_tsv) |
219f2f23 PA |
3924 | { |
3925 | cur_tsv = cur_tsv->next; | |
3926 | if (cur_tsv) | |
3927 | response_tsv (packet, cur_tsv); | |
3928 | else | |
3929 | strcpy (packet, "l"); | |
3930 | } | |
3931 | else | |
3932 | strcpy (packet, "l"); | |
3933 | } | |
3934 | ||
0fb4aa4b PA |
3935 | /* Return the first static tracepoint marker, and initialize the state |
3936 | machine that will iterate through all the static tracepoints | |
3937 | markers. */ | |
3938 | ||
3939 | static void | |
3940 | cmd_qtfstm (char *packet) | |
3941 | { | |
3942 | if (!maybe_write_ipa_ust_not_loaded (packet)) | |
42476b70 | 3943 | run_inferior_command (packet, strlen (packet) + 1); |
0fb4aa4b PA |
3944 | } |
3945 | ||
3946 | /* Return additional static tracepoints markers. */ | |
3947 | ||
3948 | static void | |
3949 | cmd_qtsstm (char *packet) | |
3950 | { | |
3951 | if (!maybe_write_ipa_ust_not_loaded (packet)) | |
42476b70 | 3952 | run_inferior_command (packet, strlen (packet) + 1); |
0fb4aa4b PA |
3953 | } |
3954 | ||
3955 | /* Return the definition of the static tracepoint at a given address. | |
3956 | Result packet is the same as qTsST's. */ | |
3957 | ||
3958 | static void | |
3959 | cmd_qtstmat (char *packet) | |
3960 | { | |
3961 | if (!maybe_write_ipa_ust_not_loaded (packet)) | |
42476b70 | 3962 | run_inferior_command (packet, strlen (packet) + 1); |
0fb4aa4b PA |
3963 | } |
3964 | ||
649ebbca DE |
3965 | /* Helper for gdb_agent_about_to_close. |
3966 | Return non-zero if thread ENTRY is in the same process in DATA. */ | |
3967 | ||
3968 | static int | |
3969 | same_process_p (struct inferior_list_entry *entry, void *data) | |
3970 | { | |
3971 | int *pid = data; | |
3972 | ||
3973 | return ptid_get_pid (entry->id) == *pid; | |
3974 | } | |
3975 | ||
7255706c YQ |
3976 | /* Sent the agent a command to close it. */ |
3977 | ||
3978 | void | |
3979 | gdb_agent_about_to_close (int pid) | |
3980 | { | |
3981 | char buf[IPA_CMD_BUF_SIZE]; | |
3982 | ||
3983 | if (!maybe_write_ipa_not_loaded (buf)) | |
3984 | { | |
0bfdf32f | 3985 | struct thread_info *saved_thread; |
7255706c | 3986 | |
0bfdf32f | 3987 | saved_thread = current_thread; |
7255706c | 3988 | |
649ebbca | 3989 | /* Find any thread which belongs to process PID. */ |
0bfdf32f | 3990 | current_thread = (struct thread_info *) |
649ebbca | 3991 | find_inferior (&all_threads, same_process_p, &pid); |
7255706c YQ |
3992 | |
3993 | strcpy (buf, "close"); | |
3994 | ||
3995 | run_inferior_command (buf, strlen (buf) + 1); | |
3996 | ||
0bfdf32f | 3997 | current_thread = saved_thread; |
7255706c YQ |
3998 | } |
3999 | } | |
4000 | ||
405f8e94 SS |
4001 | /* Return the minimum instruction size needed for fast tracepoints as a |
4002 | hexadecimal number. */ | |
4003 | ||
4004 | static void | |
4005 | cmd_qtminftpilen (char *packet) | |
4006 | { | |
0bfdf32f | 4007 | if (current_thread == NULL) |
e886a173 PA |
4008 | { |
4009 | /* Indicate that the minimum length is currently unknown. */ | |
4010 | strcpy (packet, "0"); | |
4011 | return; | |
4012 | } | |
4013 | ||
405f8e94 SS |
4014 | sprintf (packet, "%x", target_get_min_fast_tracepoint_insn_len ()); |
4015 | } | |
4016 | ||
219f2f23 PA |
4017 | /* Respond to qTBuffer packet with a block of raw data from the trace |
4018 | buffer. GDB may ask for a lot, but we are allowed to reply with | |
4019 | only as much as will fit within packet limits or whatever. */ | |
4020 | ||
4021 | static void | |
4022 | cmd_qtbuffer (char *own_buf) | |
4023 | { | |
4024 | ULONGEST offset, num, tot; | |
4025 | unsigned char *tbp; | |
4026 | char *packet = own_buf; | |
4027 | ||
4028 | packet += strlen ("qTBuffer:"); | |
4029 | ||
4030 | packet = unpack_varlen_hex (packet, &offset); | |
4031 | ++packet; /* skip a comma */ | |
f8f67713 | 4032 | unpack_varlen_hex (packet, &num); |
219f2f23 PA |
4033 | |
4034 | trace_debug ("Want to get trace buffer, %d bytes at offset 0x%s", | |
736cd585 | 4035 | (int) num, phex_nz (offset, 0)); |
219f2f23 PA |
4036 | |
4037 | tot = (trace_buffer_hi - trace_buffer_lo) - free_space (); | |
4038 | ||
4039 | /* If we're right at the end, reply specially that we're done. */ | |
4040 | if (offset == tot) | |
4041 | { | |
4042 | strcpy (own_buf, "l"); | |
4043 | return; | |
4044 | } | |
4045 | ||
4046 | /* Object to any other out-of-bounds request. */ | |
4047 | if (offset > tot) | |
4048 | { | |
4049 | write_enn (own_buf); | |
4050 | return; | |
4051 | } | |
4052 | ||
4053 | /* Compute the pointer corresponding to the given offset, accounting | |
4054 | for wraparound. */ | |
4055 | tbp = trace_buffer_start + offset; | |
4056 | if (tbp >= trace_buffer_wrap) | |
4057 | tbp -= (trace_buffer_wrap - trace_buffer_lo); | |
4058 | ||
4059 | /* Trim to the remaining bytes if we're close to the end. */ | |
4060 | if (num > tot - offset) | |
4061 | num = tot - offset; | |
4062 | ||
4063 | /* Trim to available packet size. */ | |
4064 | if (num >= (PBUFSIZ - 16) / 2 ) | |
4065 | num = (PBUFSIZ - 16) / 2; | |
4066 | ||
e9371aff | 4067 | bin2hex (tbp, own_buf, num); |
219f2f23 PA |
4068 | } |
4069 | ||
4070 | static void | |
277e4e52 | 4071 | cmd_bigqtbuffer_circular (char *own_buf) |
219f2f23 PA |
4072 | { |
4073 | ULONGEST val; | |
4074 | char *packet = own_buf; | |
4075 | ||
277e4e52 | 4076 | packet += strlen ("QTBuffer:circular:"); |
219f2f23 | 4077 | |
277e4e52 PA |
4078 | unpack_varlen_hex (packet, &val); |
4079 | circular_trace_buffer = val; | |
4080 | trace_debug ("Trace buffer is now %s", | |
4081 | circular_trace_buffer ? "circular" : "linear"); | |
4082 | write_ok (own_buf); | |
219f2f23 PA |
4083 | } |
4084 | ||
f6f899bf HAQ |
4085 | static void |
4086 | cmd_bigqtbuffer_size (char *own_buf) | |
4087 | { | |
4088 | ULONGEST val; | |
4089 | LONGEST sval; | |
4090 | char *packet = own_buf; | |
4091 | ||
4092 | /* Can't change the size during a tracing run. */ | |
4093 | if (tracing) | |
4094 | { | |
4095 | write_enn (own_buf); | |
4096 | return; | |
4097 | } | |
4098 | ||
4099 | packet += strlen ("QTBuffer:size:"); | |
4100 | ||
4101 | /* -1 is sent as literal "-1". */ | |
4102 | if (strcmp (packet, "-1") == 0) | |
4103 | sval = DEFAULT_TRACE_BUFFER_SIZE; | |
4104 | else | |
4105 | { | |
4106 | unpack_varlen_hex (packet, &val); | |
4107 | sval = (LONGEST) val; | |
4108 | } | |
4109 | ||
4110 | init_trace_buffer (sval); | |
4111 | trace_debug ("Trace buffer is now %s bytes", | |
4112 | plongest (trace_buffer_size)); | |
4113 | write_ok (own_buf); | |
4114 | } | |
4115 | ||
f196051f SS |
4116 | static void |
4117 | cmd_qtnotes (char *own_buf) | |
4118 | { | |
4119 | size_t nbytes; | |
4120 | char *saved, *user, *notes, *stopnote; | |
4121 | char *packet = own_buf; | |
4122 | ||
4123 | packet += strlen ("QTNotes:"); | |
4124 | ||
4125 | while (*packet) | |
4126 | { | |
4127 | if (strncmp ("user:", packet, strlen ("user:")) == 0) | |
4128 | { | |
4129 | packet += strlen ("user:"); | |
4130 | saved = packet; | |
4131 | packet = strchr (packet, ';'); | |
4132 | nbytes = (packet - saved) / 2; | |
4133 | user = xmalloc (nbytes + 1); | |
ff0e980e | 4134 | nbytes = hex2bin (saved, (gdb_byte *) user, nbytes); |
f196051f SS |
4135 | user[nbytes] = '\0'; |
4136 | ++packet; /* skip the semicolon */ | |
4137 | trace_debug ("User is '%s'", user); | |
8e1d55a3 | 4138 | xfree (tracing_user_name); |
f196051f SS |
4139 | tracing_user_name = user; |
4140 | } | |
4141 | else if (strncmp ("notes:", packet, strlen ("notes:")) == 0) | |
4142 | { | |
4143 | packet += strlen ("notes:"); | |
4144 | saved = packet; | |
4145 | packet = strchr (packet, ';'); | |
4146 | nbytes = (packet - saved) / 2; | |
4147 | notes = xmalloc (nbytes + 1); | |
ff0e980e | 4148 | nbytes = hex2bin (saved, (gdb_byte *) notes, nbytes); |
f196051f SS |
4149 | notes[nbytes] = '\0'; |
4150 | ++packet; /* skip the semicolon */ | |
4151 | trace_debug ("Notes is '%s'", notes); | |
8e1d55a3 | 4152 | xfree (tracing_notes); |
f196051f SS |
4153 | tracing_notes = notes; |
4154 | } | |
4155 | else if (strncmp ("tstop:", packet, strlen ("tstop:")) == 0) | |
4156 | { | |
4157 | packet += strlen ("tstop:"); | |
4158 | saved = packet; | |
4159 | packet = strchr (packet, ';'); | |
4160 | nbytes = (packet - saved) / 2; | |
4161 | stopnote = xmalloc (nbytes + 1); | |
ff0e980e | 4162 | nbytes = hex2bin (saved, (gdb_byte *) stopnote, nbytes); |
f196051f SS |
4163 | stopnote[nbytes] = '\0'; |
4164 | ++packet; /* skip the semicolon */ | |
4165 | trace_debug ("tstop note is '%s'", stopnote); | |
8e1d55a3 | 4166 | xfree (tracing_stop_note); |
f196051f SS |
4167 | tracing_stop_note = stopnote; |
4168 | } | |
4169 | else | |
4170 | break; | |
4171 | } | |
4172 | ||
4173 | write_ok (own_buf); | |
4174 | } | |
4175 | ||
219f2f23 PA |
4176 | int |
4177 | handle_tracepoint_general_set (char *packet) | |
4178 | { | |
4179 | if (strcmp ("QTinit", packet) == 0) | |
4180 | { | |
4181 | cmd_qtinit (packet); | |
4182 | return 1; | |
4183 | } | |
4184 | else if (strncmp ("QTDP:", packet, strlen ("QTDP:")) == 0) | |
4185 | { | |
4186 | cmd_qtdp (packet); | |
4187 | return 1; | |
4188 | } | |
4189 | else if (strncmp ("QTDPsrc:", packet, strlen ("QTDPsrc:")) == 0) | |
4190 | { | |
4191 | cmd_qtdpsrc (packet); | |
4192 | return 1; | |
4193 | } | |
d248b706 KY |
4194 | else if (strncmp ("QTEnable:", packet, strlen ("QTEnable:")) == 0) |
4195 | { | |
4196 | cmd_qtenable_disable (packet, 1); | |
4197 | return 1; | |
4198 | } | |
4199 | else if (strncmp ("QTDisable:", packet, strlen ("QTDisable:")) == 0) | |
4200 | { | |
4201 | cmd_qtenable_disable (packet, 0); | |
4202 | return 1; | |
4203 | } | |
219f2f23 PA |
4204 | else if (strncmp ("QTDV:", packet, strlen ("QTDV:")) == 0) |
4205 | { | |
4206 | cmd_qtdv (packet); | |
4207 | return 1; | |
4208 | } | |
4209 | else if (strncmp ("QTro:", packet, strlen ("QTro:")) == 0) | |
4210 | { | |
4211 | cmd_qtro (packet); | |
4212 | return 1; | |
4213 | } | |
4214 | else if (strcmp ("QTStart", packet) == 0) | |
4215 | { | |
4216 | cmd_qtstart (packet); | |
4217 | return 1; | |
4218 | } | |
4219 | else if (strcmp ("QTStop", packet) == 0) | |
4220 | { | |
4221 | cmd_qtstop (packet); | |
4222 | return 1; | |
4223 | } | |
8336d594 PA |
4224 | else if (strncmp ("QTDisconnected:", packet, |
4225 | strlen ("QTDisconnected:")) == 0) | |
4226 | { | |
4227 | cmd_qtdisconnected (packet); | |
4228 | return 1; | |
4229 | } | |
219f2f23 PA |
4230 | else if (strncmp ("QTFrame:", packet, strlen ("QTFrame:")) == 0) |
4231 | { | |
4232 | cmd_qtframe (packet); | |
4233 | return 1; | |
4234 | } | |
277e4e52 | 4235 | else if (strncmp ("QTBuffer:circular:", packet, strlen ("QTBuffer:circular:")) == 0) |
219f2f23 | 4236 | { |
277e4e52 | 4237 | cmd_bigqtbuffer_circular (packet); |
219f2f23 PA |
4238 | return 1; |
4239 | } | |
f6f899bf HAQ |
4240 | else if (strncmp ("QTBuffer:size:", packet, strlen ("QTBuffer:size:")) == 0) |
4241 | { | |
4242 | cmd_bigqtbuffer_size (packet); | |
4243 | return 1; | |
4244 | } | |
f196051f SS |
4245 | else if (strncmp ("QTNotes:", packet, strlen ("QTNotes:")) == 0) |
4246 | { | |
4247 | cmd_qtnotes (packet); | |
4248 | return 1; | |
4249 | } | |
219f2f23 PA |
4250 | |
4251 | return 0; | |
4252 | } | |
4253 | ||
4254 | int | |
4255 | handle_tracepoint_query (char *packet) | |
4256 | { | |
4257 | if (strcmp ("qTStatus", packet) == 0) | |
4258 | { | |
4259 | cmd_qtstatus (packet); | |
4260 | return 1; | |
4261 | } | |
f196051f SS |
4262 | else if (strncmp ("qTP:", packet, strlen ("qTP:")) == 0) |
4263 | { | |
4264 | cmd_qtp (packet); | |
4265 | return 1; | |
4266 | } | |
219f2f23 PA |
4267 | else if (strcmp ("qTfP", packet) == 0) |
4268 | { | |
4269 | cmd_qtfp (packet); | |
4270 | return 1; | |
4271 | } | |
4272 | else if (strcmp ("qTsP", packet) == 0) | |
4273 | { | |
4274 | cmd_qtsp (packet); | |
4275 | return 1; | |
4276 | } | |
4277 | else if (strcmp ("qTfV", packet) == 0) | |
4278 | { | |
4279 | cmd_qtfv (packet); | |
4280 | return 1; | |
4281 | } | |
4282 | else if (strcmp ("qTsV", packet) == 0) | |
4283 | { | |
4284 | cmd_qtsv (packet); | |
4285 | return 1; | |
4286 | } | |
4287 | else if (strncmp ("qTV:", packet, strlen ("qTV:")) == 0) | |
4288 | { | |
4289 | cmd_qtv (packet); | |
4290 | return 1; | |
4291 | } | |
4292 | else if (strncmp ("qTBuffer:", packet, strlen ("qTBuffer:")) == 0) | |
4293 | { | |
4294 | cmd_qtbuffer (packet); | |
4295 | return 1; | |
4296 | } | |
0fb4aa4b PA |
4297 | else if (strcmp ("qTfSTM", packet) == 0) |
4298 | { | |
4299 | cmd_qtfstm (packet); | |
4300 | return 1; | |
4301 | } | |
4302 | else if (strcmp ("qTsSTM", packet) == 0) | |
4303 | { | |
4304 | cmd_qtsstm (packet); | |
4305 | return 1; | |
4306 | } | |
4307 | else if (strncmp ("qTSTMat:", packet, strlen ("qTSTMat:")) == 0) | |
4308 | { | |
4309 | cmd_qtstmat (packet); | |
4310 | return 1; | |
4311 | } | |
405f8e94 SS |
4312 | else if (strcmp ("qTMinFTPILen", packet) == 0) |
4313 | { | |
4314 | cmd_qtminftpilen (packet); | |
4315 | return 1; | |
4316 | } | |
219f2f23 PA |
4317 | |
4318 | return 0; | |
4319 | } | |
4320 | ||
fa593d66 PA |
4321 | #endif |
4322 | #ifndef IN_PROCESS_AGENT | |
4323 | ||
219f2f23 PA |
4324 | /* Call this when thread TINFO has hit the tracepoint defined by |
4325 | TP_NUMBER and TP_ADDRESS, and that tracepoint has a while-stepping | |
4326 | action. This adds a while-stepping collecting state item to the | |
4327 | threads' collecting state list, so that we can keep track of | |
4328 | multiple simultaneous while-stepping actions being collected by the | |
4329 | same thread. This can happen in cases like: | |
4330 | ||
4331 | ff0001 INSN1 <-- TP1, while-stepping 10 collect $regs | |
4332 | ff0002 INSN2 | |
4333 | ff0003 INSN3 <-- TP2, collect $regs | |
4334 | ff0004 INSN4 <-- TP3, while-stepping 10 collect $regs | |
4335 | ff0005 INSN5 | |
4336 | ||
4337 | Notice that when instruction INSN5 is reached, the while-stepping | |
4338 | actions of both TP1 and TP3 are still being collected, and that TP2 | |
4339 | had been collected meanwhile. The whole range of ff0001-ff0005 | |
4340 | should be single-stepped, due to at least TP1's while-stepping | |
4341 | action covering the whole range. */ | |
4342 | ||
4343 | static void | |
4344 | add_while_stepping_state (struct thread_info *tinfo, | |
4345 | int tp_number, CORE_ADDR tp_address) | |
4346 | { | |
4347 | struct wstep_state *wstep; | |
4348 | ||
4349 | wstep = xmalloc (sizeof (*wstep)); | |
4350 | wstep->next = tinfo->while_stepping; | |
4351 | ||
4352 | wstep->tp_number = tp_number; | |
4353 | wstep->tp_address = tp_address; | |
4354 | wstep->current_step = 0; | |
4355 | ||
4356 | tinfo->while_stepping = wstep; | |
4357 | } | |
4358 | ||
4359 | /* Release the while-stepping collecting state WSTEP. */ | |
4360 | ||
4361 | static void | |
4362 | release_while_stepping_state (struct wstep_state *wstep) | |
4363 | { | |
4364 | free (wstep); | |
4365 | } | |
4366 | ||
4367 | /* Release all while-stepping collecting states currently associated | |
4368 | with thread TINFO. */ | |
4369 | ||
4370 | void | |
4371 | release_while_stepping_state_list (struct thread_info *tinfo) | |
4372 | { | |
4373 | struct wstep_state *head; | |
4374 | ||
4375 | while (tinfo->while_stepping) | |
4376 | { | |
4377 | head = tinfo->while_stepping; | |
4378 | tinfo->while_stepping = head->next; | |
4379 | release_while_stepping_state (head); | |
4380 | } | |
4381 | } | |
4382 | ||
4383 | /* If TINFO was handling a 'while-stepping' action, the step has | |
4384 | finished, so collect any step data needed, and check if any more | |
4385 | steps are required. Return true if the thread was indeed | |
4386 | collecting tracepoint data, false otherwise. */ | |
4387 | ||
4388 | int | |
4389 | tracepoint_finished_step (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
4390 | { | |
4391 | struct tracepoint *tpoint; | |
4392 | struct wstep_state *wstep; | |
4393 | struct wstep_state **wstep_link; | |
4394 | struct trap_tracepoint_ctx ctx; | |
4395 | ||
fa593d66 PA |
4396 | /* Pull in fast tracepoint trace frames from the inferior lib buffer into |
4397 | our buffer. */ | |
58b4daa5 | 4398 | if (agent_loaded_p ()) |
fa593d66 PA |
4399 | upload_fast_traceframes (); |
4400 | ||
219f2f23 PA |
4401 | /* Check if we were indeed collecting data for one of more |
4402 | tracepoints with a 'while-stepping' count. */ | |
4403 | if (tinfo->while_stepping == NULL) | |
4404 | return 0; | |
4405 | ||
4406 | if (!tracing) | |
4407 | { | |
4408 | /* We're not even tracing anymore. Stop this thread from | |
4409 | collecting. */ | |
4410 | release_while_stepping_state_list (tinfo); | |
4411 | ||
4412 | /* The thread had stopped due to a single-step request indeed | |
4413 | explained by a tracepoint. */ | |
4414 | return 1; | |
4415 | } | |
4416 | ||
4417 | wstep = tinfo->while_stepping; | |
4418 | wstep_link = &tinfo->while_stepping; | |
4419 | ||
4420 | trace_debug ("Thread %s finished a single-step for tracepoint %d at 0x%s", | |
4421 | target_pid_to_str (tinfo->entry.id), | |
4422 | wstep->tp_number, paddress (wstep->tp_address)); | |
4423 | ||
fa593d66 | 4424 | ctx.base.type = trap_tracepoint; |
219f2f23 PA |
4425 | ctx.regcache = get_thread_regcache (tinfo, 1); |
4426 | ||
4427 | while (wstep != NULL) | |
4428 | { | |
4429 | tpoint = find_tracepoint (wstep->tp_number, wstep->tp_address); | |
4430 | if (tpoint == NULL) | |
4431 | { | |
4432 | trace_debug ("NO TRACEPOINT %d at 0x%s FOR THREAD %s!", | |
4433 | wstep->tp_number, paddress (wstep->tp_address), | |
4434 | target_pid_to_str (tinfo->entry.id)); | |
4435 | ||
4436 | /* Unlink. */ | |
4437 | *wstep_link = wstep->next; | |
4438 | release_while_stepping_state (wstep); | |
4f269b12 | 4439 | wstep = *wstep_link; |
219f2f23 PA |
4440 | continue; |
4441 | } | |
4442 | ||
4443 | /* We've just finished one step. */ | |
4444 | ++wstep->current_step; | |
4445 | ||
4446 | /* Collect data. */ | |
4447 | collect_data_at_step ((struct tracepoint_hit_ctx *) &ctx, | |
4448 | stop_pc, tpoint, wstep->current_step); | |
4449 | ||
4450 | if (wstep->current_step >= tpoint->step_count) | |
4451 | { | |
4452 | /* The requested numbers of steps have occurred. */ | |
4453 | trace_debug ("Thread %s done stepping for tracepoint %d at 0x%s", | |
4454 | target_pid_to_str (tinfo->entry.id), | |
4455 | wstep->tp_number, paddress (wstep->tp_address)); | |
4456 | ||
4457 | /* Unlink the wstep. */ | |
4458 | *wstep_link = wstep->next; | |
4459 | release_while_stepping_state (wstep); | |
4460 | wstep = *wstep_link; | |
4461 | ||
4462 | /* Only check the hit count now, which ensure that we do all | |
4463 | our stepping before stopping the run. */ | |
4464 | if (tpoint->pass_count > 0 | |
4465 | && tpoint->hit_count >= tpoint->pass_count | |
4466 | && stopping_tracepoint == NULL) | |
4467 | stopping_tracepoint = tpoint; | |
4468 | } | |
4469 | else | |
4470 | { | |
4471 | /* Keep single-stepping until the requested numbers of steps | |
4472 | have occurred. */ | |
4473 | wstep_link = &wstep->next; | |
4474 | wstep = *wstep_link; | |
4475 | } | |
4476 | ||
4477 | if (stopping_tracepoint | |
4478 | || trace_buffer_is_full | |
4479 | || expr_eval_result != expr_eval_no_error) | |
4480 | { | |
4481 | stop_tracing (); | |
4482 | break; | |
4483 | } | |
4484 | } | |
4485 | ||
4486 | return 1; | |
4487 | } | |
4488 | ||
fa593d66 PA |
4489 | /* Handle any internal tracing control breakpoint hits. That means, |
4490 | pull traceframes from the IPA to our buffer, and syncing both | |
4491 | tracing agents when the IPA's tracing stops for some reason. */ | |
4492 | ||
4493 | int | |
4494 | handle_tracepoint_bkpts (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
4495 | { | |
4496 | /* Pull in fast tracepoint trace frames from the inferior in-process | |
4497 | agent's buffer into our buffer. */ | |
4498 | ||
58b4daa5 | 4499 | if (!agent_loaded_p ()) |
fa593d66 PA |
4500 | return 0; |
4501 | ||
4502 | upload_fast_traceframes (); | |
4503 | ||
4504 | /* Check if the in-process agent had decided we should stop | |
4505 | tracing. */ | |
4506 | if (stop_pc == ipa_sym_addrs.addr_stop_tracing) | |
4507 | { | |
4508 | int ipa_trace_buffer_is_full; | |
4509 | CORE_ADDR ipa_stopping_tracepoint; | |
4510 | int ipa_expr_eval_result; | |
4511 | CORE_ADDR ipa_error_tracepoint; | |
4512 | ||
4513 | trace_debug ("lib stopped at stop_tracing"); | |
4514 | ||
4515 | read_inferior_integer (ipa_sym_addrs.addr_trace_buffer_is_full, | |
4516 | &ipa_trace_buffer_is_full); | |
4517 | ||
4518 | read_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, | |
4519 | &ipa_stopping_tracepoint); | |
4520 | write_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, 0); | |
4521 | ||
4522 | read_inferior_data_pointer (ipa_sym_addrs.addr_error_tracepoint, | |
4523 | &ipa_error_tracepoint); | |
4524 | write_inferior_data_pointer (ipa_sym_addrs.addr_error_tracepoint, 0); | |
4525 | ||
4526 | read_inferior_integer (ipa_sym_addrs.addr_expr_eval_result, | |
4527 | &ipa_expr_eval_result); | |
4528 | write_inferior_integer (ipa_sym_addrs.addr_expr_eval_result, 0); | |
4529 | ||
4530 | trace_debug ("lib: trace_buffer_is_full: %d, " | |
4531 | "stopping_tracepoint: %s, " | |
4532 | "ipa_expr_eval_result: %d, " | |
4533 | "error_tracepoint: %s, ", | |
4534 | ipa_trace_buffer_is_full, | |
4535 | paddress (ipa_stopping_tracepoint), | |
4536 | ipa_expr_eval_result, | |
4537 | paddress (ipa_error_tracepoint)); | |
4538 | ||
4539 | if (debug_threads) | |
4540 | { | |
4541 | if (ipa_trace_buffer_is_full) | |
4542 | trace_debug ("lib stopped due to full buffer."); | |
4543 | if (ipa_stopping_tracepoint) | |
4544 | trace_debug ("lib stopped due to tpoint"); | |
4545 | if (ipa_stopping_tracepoint) | |
4546 | trace_debug ("lib stopped due to error"); | |
4547 | } | |
4548 | ||
4549 | if (ipa_stopping_tracepoint != 0) | |
4550 | { | |
4551 | stopping_tracepoint | |
4552 | = fast_tracepoint_from_ipa_tpoint_address (ipa_stopping_tracepoint); | |
4553 | } | |
4554 | else if (ipa_expr_eval_result != expr_eval_no_error) | |
4555 | { | |
4556 | expr_eval_result = ipa_expr_eval_result; | |
4557 | error_tracepoint | |
4558 | = fast_tracepoint_from_ipa_tpoint_address (ipa_error_tracepoint); | |
4559 | } | |
4560 | stop_tracing (); | |
4561 | return 1; | |
4562 | } | |
4563 | else if (stop_pc == ipa_sym_addrs.addr_flush_trace_buffer) | |
4564 | { | |
4565 | trace_debug ("lib stopped at flush_trace_buffer"); | |
4566 | return 1; | |
4567 | } | |
4568 | ||
4569 | return 0; | |
4570 | } | |
4571 | ||
219f2f23 PA |
4572 | /* Return true if TINFO just hit a tracepoint. Collect data if |
4573 | so. */ | |
4574 | ||
4575 | int | |
4576 | tracepoint_was_hit (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
4577 | { | |
4578 | struct tracepoint *tpoint; | |
4579 | int ret = 0; | |
4580 | struct trap_tracepoint_ctx ctx; | |
4581 | ||
4582 | /* Not tracing, don't handle. */ | |
4583 | if (!tracing) | |
4584 | return 0; | |
4585 | ||
fa593d66 | 4586 | ctx.base.type = trap_tracepoint; |
219f2f23 PA |
4587 | ctx.regcache = get_thread_regcache (tinfo, 1); |
4588 | ||
4589 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
4590 | { | |
fa593d66 PA |
4591 | /* Note that we collect fast tracepoints here as well. We'll |
4592 | step over the fast tracepoint jump later, which avoids the | |
f72429c5 YQ |
4593 | double collect. However, we don't collect for static |
4594 | tracepoints here, because UST markers are compiled in program, | |
4595 | and probes will be executed in program. So static tracepoints | |
4596 | are collected there. */ | |
4597 | if (tpoint->enabled && stop_pc == tpoint->address | |
4598 | && tpoint->type != static_tracepoint) | |
219f2f23 PA |
4599 | { |
4600 | trace_debug ("Thread %s at address of tracepoint %d at 0x%s", | |
4601 | target_pid_to_str (tinfo->entry.id), | |
4602 | tpoint->number, paddress (tpoint->address)); | |
4603 | ||
4604 | /* Test the condition if present, and collect if true. */ | |
4605 | if (!tpoint->cond | |
4606 | || (condition_true_at_tracepoint | |
4607 | ((struct tracepoint_hit_ctx *) &ctx, tpoint))) | |
4608 | collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
4609 | stop_pc, tpoint); | |
4610 | ||
4611 | if (stopping_tracepoint | |
4612 | || trace_buffer_is_full | |
4613 | || expr_eval_result != expr_eval_no_error) | |
4614 | { | |
4615 | stop_tracing (); | |
4616 | } | |
4617 | /* If the tracepoint had a 'while-stepping' action, then set | |
4618 | the thread to collect this tracepoint on the following | |
4619 | single-steps. */ | |
4620 | else if (tpoint->step_count > 0) | |
4621 | { | |
4622 | add_while_stepping_state (tinfo, | |
4623 | tpoint->number, tpoint->address); | |
4624 | } | |
4625 | ||
4626 | ret = 1; | |
4627 | } | |
4628 | } | |
4629 | ||
4630 | return ret; | |
4631 | } | |
4632 | ||
fa593d66 PA |
4633 | #endif |
4634 | ||
0fb4aa4b PA |
4635 | #if defined IN_PROCESS_AGENT && defined HAVE_UST |
4636 | struct ust_marker_data; | |
4637 | static void collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
0fb4aa4b PA |
4638 | struct traceframe *tframe); |
4639 | #endif | |
4640 | ||
219f2f23 PA |
4641 | /* Create a trace frame for the hit of the given tracepoint in the |
4642 | given thread. */ | |
4643 | ||
4644 | static void | |
4645 | collect_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, CORE_ADDR stop_pc, | |
4646 | struct tracepoint *tpoint) | |
4647 | { | |
4648 | struct traceframe *tframe; | |
4649 | int acti; | |
4650 | ||
4651 | /* Only count it as a hit when we actually collect data. */ | |
4652 | tpoint->hit_count++; | |
4653 | ||
4654 | /* If we've exceeded a defined pass count, record the event for | |
4655 | later, and finish the collection for this hit. This test is only | |
4656 | for nonstepping tracepoints, stepping tracepoints test at the end | |
4657 | of their while-stepping loop. */ | |
4658 | if (tpoint->pass_count > 0 | |
4659 | && tpoint->hit_count >= tpoint->pass_count | |
4660 | && tpoint->step_count == 0 | |
4661 | && stopping_tracepoint == NULL) | |
4662 | stopping_tracepoint = tpoint; | |
4663 | ||
5f18041e | 4664 | trace_debug ("Making new traceframe for tracepoint %d at 0x%s, hit %" PRIu64, |
219f2f23 PA |
4665 | tpoint->number, paddress (tpoint->address), tpoint->hit_count); |
4666 | ||
4667 | tframe = add_traceframe (tpoint); | |
4668 | ||
4669 | if (tframe) | |
4670 | { | |
4671 | for (acti = 0; acti < tpoint->numactions; ++acti) | |
4672 | { | |
fa593d66 | 4673 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
4674 | trace_debug ("Tracepoint %d at 0x%s about to do action '%s'", |
4675 | tpoint->number, paddress (tpoint->address), | |
4676 | tpoint->actions_str[acti]); | |
fa593d66 | 4677 | #endif |
219f2f23 PA |
4678 | |
4679 | do_action_at_tracepoint (ctx, stop_pc, tpoint, tframe, | |
4680 | tpoint->actions[acti]); | |
4681 | } | |
4682 | ||
4683 | finish_traceframe (tframe); | |
4684 | } | |
4685 | ||
4686 | if (tframe == NULL && tracing) | |
4687 | trace_buffer_is_full = 1; | |
4688 | } | |
4689 | ||
fa593d66 PA |
4690 | #ifndef IN_PROCESS_AGENT |
4691 | ||
219f2f23 PA |
4692 | static void |
4693 | collect_data_at_step (struct tracepoint_hit_ctx *ctx, | |
4694 | CORE_ADDR stop_pc, | |
4695 | struct tracepoint *tpoint, int current_step) | |
4696 | { | |
4697 | struct traceframe *tframe; | |
4698 | int acti; | |
4699 | ||
4700 | trace_debug ("Making new step traceframe for " | |
5f18041e | 4701 | "tracepoint %d at 0x%s, step %d of %" PRIu64 ", hit %" PRIu64, |
219f2f23 PA |
4702 | tpoint->number, paddress (tpoint->address), |
4703 | current_step, tpoint->step_count, | |
4704 | tpoint->hit_count); | |
4705 | ||
4706 | tframe = add_traceframe (tpoint); | |
4707 | ||
4708 | if (tframe) | |
4709 | { | |
4710 | for (acti = 0; acti < tpoint->num_step_actions; ++acti) | |
4711 | { | |
4712 | trace_debug ("Tracepoint %d at 0x%s about to do step action '%s'", | |
4713 | tpoint->number, paddress (tpoint->address), | |
4714 | tpoint->step_actions_str[acti]); | |
4715 | ||
4716 | do_action_at_tracepoint (ctx, stop_pc, tpoint, tframe, | |
4717 | tpoint->step_actions[acti]); | |
4718 | } | |
4719 | ||
4720 | finish_traceframe (tframe); | |
4721 | } | |
4722 | ||
4723 | if (tframe == NULL && tracing) | |
4724 | trace_buffer_is_full = 1; | |
4725 | } | |
4726 | ||
fa593d66 PA |
4727 | #endif |
4728 | ||
3aee8918 PA |
4729 | #ifdef IN_PROCESS_AGENT |
4730 | /* The target description used by the IPA. Given that the IPA library | |
4731 | is built for a specific architecture that is loaded into the | |
4732 | inferior, there only needs to be one such description per | |
4733 | build. */ | |
4734 | const struct target_desc *ipa_tdesc; | |
4735 | #endif | |
4736 | ||
219f2f23 PA |
4737 | static struct regcache * |
4738 | get_context_regcache (struct tracepoint_hit_ctx *ctx) | |
4739 | { | |
fa593d66 PA |
4740 | struct regcache *regcache = NULL; |
4741 | ||
4742 | #ifdef IN_PROCESS_AGENT | |
4743 | if (ctx->type == fast_tracepoint) | |
4744 | { | |
4745 | struct fast_tracepoint_ctx *fctx = (struct fast_tracepoint_ctx *) ctx; | |
4746 | if (!fctx->regcache_initted) | |
4747 | { | |
4748 | fctx->regcache_initted = 1; | |
3aee8918 | 4749 | init_register_cache (&fctx->regcache, ipa_tdesc, fctx->regspace); |
fa593d66 PA |
4750 | supply_regblock (&fctx->regcache, NULL); |
4751 | supply_fast_tracepoint_registers (&fctx->regcache, fctx->regs); | |
4752 | } | |
4753 | regcache = &fctx->regcache; | |
4754 | } | |
0fb4aa4b PA |
4755 | #ifdef HAVE_UST |
4756 | if (ctx->type == static_tracepoint) | |
4757 | { | |
493e2a69 MS |
4758 | struct static_tracepoint_ctx *sctx |
4759 | = (struct static_tracepoint_ctx *) ctx; | |
4760 | ||
0fb4aa4b PA |
4761 | if (!sctx->regcache_initted) |
4762 | { | |
4763 | sctx->regcache_initted = 1; | |
3aee8918 | 4764 | init_register_cache (&sctx->regcache, ipa_tdesc, sctx->regspace); |
0fb4aa4b PA |
4765 | supply_regblock (&sctx->regcache, NULL); |
4766 | /* Pass down the tracepoint address, because REGS doesn't | |
4767 | include the PC, but we know what it must have been. */ | |
4768 | supply_static_tracepoint_registers (&sctx->regcache, | |
4769 | (const unsigned char *) | |
4770 | sctx->regs, | |
4771 | sctx->tpoint->address); | |
4772 | } | |
4773 | regcache = &sctx->regcache; | |
4774 | } | |
4775 | #endif | |
fa593d66 PA |
4776 | #else |
4777 | if (ctx->type == trap_tracepoint) | |
4778 | { | |
4779 | struct trap_tracepoint_ctx *tctx = (struct trap_tracepoint_ctx *) ctx; | |
4780 | regcache = tctx->regcache; | |
4781 | } | |
4782 | #endif | |
219f2f23 PA |
4783 | |
4784 | gdb_assert (regcache != NULL); | |
4785 | ||
4786 | return regcache; | |
4787 | } | |
4788 | ||
4789 | static void | |
4790 | do_action_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
4791 | CORE_ADDR stop_pc, | |
4792 | struct tracepoint *tpoint, | |
4793 | struct traceframe *tframe, | |
4794 | struct tracepoint_action *taction) | |
4795 | { | |
4796 | enum eval_result_type err; | |
4797 | ||
4798 | switch (taction->type) | |
4799 | { | |
4800 | case 'M': | |
4801 | { | |
4802 | struct collect_memory_action *maction; | |
5ae4861a | 4803 | struct eval_agent_expr_context ax_ctx; |
219f2f23 PA |
4804 | |
4805 | maction = (struct collect_memory_action *) taction; | |
5ae4861a YQ |
4806 | ax_ctx.regcache = NULL; |
4807 | ax_ctx.tframe = tframe; | |
4808 | ax_ctx.tpoint = tpoint; | |
219f2f23 PA |
4809 | |
4810 | trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)", | |
4811 | pulongest (maction->len), | |
4812 | paddress (maction->addr), maction->basereg); | |
4813 | /* (should use basereg) */ | |
5ae4861a YQ |
4814 | agent_mem_read (&ax_ctx, NULL, (CORE_ADDR) maction->addr, |
4815 | maction->len); | |
219f2f23 PA |
4816 | break; |
4817 | } | |
4818 | case 'R': | |
4819 | { | |
219f2f23 PA |
4820 | unsigned char *regspace; |
4821 | struct regcache tregcache; | |
4822 | struct regcache *context_regcache; | |
3aee8918 | 4823 | int regcache_size; |
219f2f23 PA |
4824 | |
4825 | trace_debug ("Want to collect registers"); | |
4826 | ||
3aee8918 PA |
4827 | context_regcache = get_context_regcache (ctx); |
4828 | regcache_size = register_cache_size (context_regcache->tdesc); | |
4829 | ||
219f2f23 | 4830 | /* Collect all registers for now. */ |
3aee8918 | 4831 | regspace = add_traceframe_block (tframe, tpoint, 1 + regcache_size); |
219f2f23 PA |
4832 | if (regspace == NULL) |
4833 | { | |
4834 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
4835 | break; | |
4836 | } | |
4837 | /* Identify a register block. */ | |
4838 | *regspace = 'R'; | |
4839 | ||
219f2f23 PA |
4840 | /* Wrap the regblock in a register cache (in the stack, we |
4841 | don't want to malloc here). */ | |
3aee8918 PA |
4842 | init_register_cache (&tregcache, context_regcache->tdesc, |
4843 | regspace + 1); | |
219f2f23 PA |
4844 | |
4845 | /* Copy the register data to the regblock. */ | |
4846 | regcache_cpy (&tregcache, context_regcache); | |
4847 | ||
fa593d66 | 4848 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
4849 | /* On some platforms, trap-based tracepoints will have the PC |
4850 | pointing to the next instruction after the trap, but we | |
4851 | don't want the user or GDB trying to guess whether the | |
4852 | saved PC needs adjusting; so always record the adjusted | |
4853 | stop_pc. Note that we can't use tpoint->address instead, | |
fa593d66 PA |
4854 | since it will be wrong for while-stepping actions. This |
4855 | adjustment is a nop for fast tracepoints collected from the | |
4856 | in-process lib (but not if GDBserver is collecting one | |
4857 | preemptively), since the PC had already been adjusted to | |
4858 | contain the tracepoint's address by the jump pad. */ | |
219f2f23 | 4859 | trace_debug ("Storing stop pc (0x%s) in regblock", |
8d00225b | 4860 | paddress (stop_pc)); |
219f2f23 PA |
4861 | |
4862 | /* This changes the regblock, not the thread's | |
4863 | regcache. */ | |
4864 | regcache_write_pc (&tregcache, stop_pc); | |
fa593d66 | 4865 | #endif |
219f2f23 PA |
4866 | } |
4867 | break; | |
4868 | case 'X': | |
4869 | { | |
4870 | struct eval_expr_action *eaction; | |
5ae4861a | 4871 | struct eval_agent_expr_context ax_ctx; |
219f2f23 PA |
4872 | |
4873 | eaction = (struct eval_expr_action *) taction; | |
5ae4861a YQ |
4874 | ax_ctx.regcache = get_context_regcache (ctx); |
4875 | ax_ctx.tframe = tframe; | |
4876 | ax_ctx.tpoint = tpoint; | |
219f2f23 PA |
4877 | |
4878 | trace_debug ("Want to evaluate expression"); | |
4879 | ||
5ae4861a | 4880 | err = gdb_eval_agent_expr (&ax_ctx, eaction->expr, NULL); |
219f2f23 PA |
4881 | |
4882 | if (err != expr_eval_no_error) | |
4883 | { | |
4884 | record_tracepoint_error (tpoint, "action expression", err); | |
4885 | return; | |
4886 | } | |
4887 | } | |
4888 | break; | |
0fb4aa4b PA |
4889 | case 'L': |
4890 | { | |
4891 | #if defined IN_PROCESS_AGENT && defined HAVE_UST | |
4892 | trace_debug ("Want to collect static trace data"); | |
19560ba5 | 4893 | collect_ust_data_at_tracepoint (ctx, tframe); |
0fb4aa4b PA |
4894 | #else |
4895 | trace_debug ("warning: collecting static trace data, " | |
4896 | "but static tracepoints are not supported"); | |
4897 | #endif | |
4898 | } | |
4899 | break; | |
219f2f23 PA |
4900 | default: |
4901 | trace_debug ("unknown trace action '%c', ignoring", taction->type); | |
4902 | break; | |
4903 | } | |
4904 | } | |
4905 | ||
4906 | static int | |
4907 | condition_true_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
4908 | struct tracepoint *tpoint) | |
4909 | { | |
4910 | ULONGEST value = 0; | |
4911 | enum eval_result_type err; | |
4912 | ||
c6beb2cb PA |
4913 | /* Presently, gdbserver doesn't run compiled conditions, only the |
4914 | IPA does. If the program stops at a fast tracepoint's address | |
4915 | (e.g., due to a breakpoint, trap tracepoint, or stepping), | |
4916 | gdbserver preemptively collect the fast tracepoint. Later, on | |
4917 | resume, gdbserver steps over the fast tracepoint like it steps | |
4918 | over breakpoints, so that the IPA doesn't see that fast | |
4919 | tracepoint. This avoids double collects of fast tracepoints in | |
4920 | that stopping scenario. Having gdbserver itself handle the fast | |
4921 | tracepoint gives the user a consistent view of when fast or trap | |
4922 | tracepoints are collected, compared to an alternative where only | |
4923 | trap tracepoints are collected on stop, and fast tracepoints on | |
4924 | resume. When a fast tracepoint is being processed by gdbserver, | |
4925 | it is always the non-compiled condition expression that is | |
4926 | used. */ | |
4927 | #ifdef IN_PROCESS_AGENT | |
6a271cae PA |
4928 | if (tpoint->compiled_cond) |
4929 | err = ((condfn) (uintptr_t) (tpoint->compiled_cond)) (ctx, &value); | |
4930 | else | |
c6beb2cb | 4931 | #endif |
5ae4861a YQ |
4932 | { |
4933 | struct eval_agent_expr_context ax_ctx; | |
219f2f23 | 4934 | |
5ae4861a YQ |
4935 | ax_ctx.regcache = get_context_regcache (ctx); |
4936 | ax_ctx.tframe = NULL; | |
4937 | ax_ctx.tpoint = tpoint; | |
4938 | ||
4939 | err = gdb_eval_agent_expr (&ax_ctx, tpoint->cond, &value); | |
4940 | } | |
219f2f23 PA |
4941 | if (err != expr_eval_no_error) |
4942 | { | |
4943 | record_tracepoint_error (tpoint, "condition", err); | |
4944 | /* The error case must return false. */ | |
4945 | return 0; | |
4946 | } | |
4947 | ||
4948 | trace_debug ("Tracepoint %d at 0x%s condition evals to %s", | |
4949 | tpoint->number, paddress (tpoint->address), | |
4950 | pulongest (value)); | |
4951 | return (value ? 1 : 0); | |
4952 | } | |
4953 | ||
219f2f23 PA |
4954 | /* Do memory copies for bytecodes. */ |
4955 | /* Do the recording of memory blocks for actions and bytecodes. */ | |
4956 | ||
5e1dc496 | 4957 | int |
5ae4861a | 4958 | agent_mem_read (struct eval_agent_expr_context *ctx, |
219f2f23 PA |
4959 | unsigned char *to, CORE_ADDR from, ULONGEST len) |
4960 | { | |
4961 | unsigned char *mspace; | |
4962 | ULONGEST remaining = len; | |
4963 | unsigned short blocklen; | |
4964 | ||
4965 | /* If a 'to' buffer is specified, use it. */ | |
4966 | if (to != NULL) | |
4967 | { | |
4968 | read_inferior_memory (from, to, len); | |
4969 | return 0; | |
4970 | } | |
4971 | ||
4972 | /* Otherwise, create a new memory block in the trace buffer. */ | |
4973 | while (remaining > 0) | |
4974 | { | |
4975 | size_t sp; | |
4976 | ||
4977 | blocklen = (remaining > 65535 ? 65535 : remaining); | |
4978 | sp = 1 + sizeof (from) + sizeof (blocklen) + blocklen; | |
5ae4861a | 4979 | mspace = add_traceframe_block (ctx->tframe, ctx->tpoint, sp); |
219f2f23 PA |
4980 | if (mspace == NULL) |
4981 | return 1; | |
4982 | /* Identify block as a memory block. */ | |
4983 | *mspace = 'M'; | |
4984 | ++mspace; | |
4985 | /* Record address and size. */ | |
4986 | memcpy (mspace, &from, sizeof (from)); | |
4987 | mspace += sizeof (from); | |
4988 | memcpy (mspace, &blocklen, sizeof (blocklen)); | |
4989 | mspace += sizeof (blocklen); | |
4990 | /* Record the memory block proper. */ | |
4991 | read_inferior_memory (from, mspace, blocklen); | |
4992 | trace_debug ("%d bytes recorded", blocklen); | |
4993 | remaining -= blocklen; | |
4994 | from += blocklen; | |
4995 | } | |
4996 | return 0; | |
4997 | } | |
4998 | ||
5e1dc496 | 4999 | int |
5ae4861a | 5000 | agent_mem_read_string (struct eval_agent_expr_context *ctx, |
3065dfb6 SS |
5001 | unsigned char *to, CORE_ADDR from, ULONGEST len) |
5002 | { | |
5003 | unsigned char *buf, *mspace; | |
5004 | ULONGEST remaining = len; | |
5005 | unsigned short blocklen, i; | |
5006 | ||
5007 | /* To save a bit of space, block lengths are 16-bit, so break large | |
5008 | requests into multiple blocks. Bordering on overkill for strings, | |
5009 | but it could happen that someone specifies a large max length. */ | |
5010 | while (remaining > 0) | |
5011 | { | |
5012 | size_t sp; | |
5013 | ||
5014 | blocklen = (remaining > 65535 ? 65535 : remaining); | |
5015 | /* We want working space to accumulate nonzero bytes, since | |
5016 | traceframes must have a predecided size (otherwise it gets | |
5017 | harder to wrap correctly for the circular case, etc). */ | |
5018 | buf = (unsigned char *) xmalloc (blocklen + 1); | |
5019 | for (i = 0; i < blocklen; ++i) | |
5020 | { | |
5021 | /* Read the string one byte at a time, in case the string is | |
5022 | at the end of a valid memory area - we don't want a | |
5023 | correctly-terminated string to engender segvio | |
5024 | complaints. */ | |
5025 | read_inferior_memory (from + i, buf + i, 1); | |
5026 | ||
5027 | if (buf[i] == '\0') | |
5028 | { | |
5029 | blocklen = i + 1; | |
5030 | /* Make sure outer loop stops now too. */ | |
5031 | remaining = blocklen; | |
5032 | break; | |
5033 | } | |
5034 | } | |
5035 | sp = 1 + sizeof (from) + sizeof (blocklen) + blocklen; | |
5ae4861a | 5036 | mspace = add_traceframe_block (ctx->tframe, ctx->tpoint, sp); |
3065dfb6 SS |
5037 | if (mspace == NULL) |
5038 | { | |
5039 | xfree (buf); | |
5040 | return 1; | |
5041 | } | |
5042 | /* Identify block as a memory block. */ | |
5043 | *mspace = 'M'; | |
5044 | ++mspace; | |
5045 | /* Record address and size. */ | |
5046 | memcpy ((void *) mspace, (void *) &from, sizeof (from)); | |
5047 | mspace += sizeof (from); | |
5048 | memcpy ((void *) mspace, (void *) &blocklen, sizeof (blocklen)); | |
5049 | mspace += sizeof (blocklen); | |
5050 | /* Copy the string contents. */ | |
5051 | memcpy ((void *) mspace, (void *) buf, blocklen); | |
5052 | remaining -= blocklen; | |
5053 | from += blocklen; | |
5054 | xfree (buf); | |
5055 | } | |
5056 | return 0; | |
5057 | } | |
5058 | ||
219f2f23 PA |
5059 | /* Record the value of a trace state variable. */ |
5060 | ||
5e1dc496 | 5061 | int |
5ae4861a | 5062 | agent_tsv_read (struct eval_agent_expr_context *ctx, int n) |
219f2f23 PA |
5063 | { |
5064 | unsigned char *vspace; | |
5065 | LONGEST val; | |
5066 | ||
5ae4861a | 5067 | vspace = add_traceframe_block (ctx->tframe, ctx->tpoint, |
219f2f23 PA |
5068 | 1 + sizeof (n) + sizeof (LONGEST)); |
5069 | if (vspace == NULL) | |
5070 | return 1; | |
5071 | /* Identify block as a variable. */ | |
5072 | *vspace = 'V'; | |
5073 | /* Record variable's number and value. */ | |
5074 | memcpy (vspace + 1, &n, sizeof (n)); | |
5075 | val = get_trace_state_variable_value (n); | |
5076 | memcpy (vspace + 1 + sizeof (n), &val, sizeof (val)); | |
5077 | trace_debug ("Variable %d recorded", n); | |
5078 | return 0; | |
5079 | } | |
5080 | ||
fa593d66 PA |
5081 | #ifndef IN_PROCESS_AGENT |
5082 | ||
b3b9301e PA |
5083 | /* Callback for traceframe_walk_blocks, used to find a given block |
5084 | type in a traceframe. */ | |
5085 | ||
5086 | static int | |
5087 | match_blocktype (char blocktype, unsigned char *dataptr, void *data) | |
5088 | { | |
5089 | char *wantedp = data; | |
5090 | ||
5091 | if (*wantedp == blocktype) | |
5092 | return 1; | |
5093 | ||
5094 | return 0; | |
5095 | } | |
5096 | ||
5097 | /* Walk over all traceframe blocks of the traceframe buffer starting | |
5098 | at DATABASE, of DATASIZE bytes long, and call CALLBACK for each | |
5099 | block found, passing in DATA unmodified. If CALLBACK returns true, | |
5100 | this returns a pointer to where the block is found. Returns NULL | |
5101 | if no callback call returned true, indicating that all blocks have | |
5102 | been walked. */ | |
5103 | ||
219f2f23 | 5104 | static unsigned char * |
b3b9301e PA |
5105 | traceframe_walk_blocks (unsigned char *database, unsigned int datasize, |
5106 | int tfnum, | |
5107 | int (*callback) (char blocktype, | |
5108 | unsigned char *dataptr, | |
5109 | void *data), | |
5110 | void *data) | |
219f2f23 PA |
5111 | { |
5112 | unsigned char *dataptr; | |
5113 | ||
5114 | if (datasize == 0) | |
5115 | { | |
5116 | trace_debug ("traceframe %d has no data", tfnum); | |
5117 | return NULL; | |
5118 | } | |
5119 | ||
5120 | /* Iterate through a traceframe's blocks, looking for a block of the | |
5121 | requested type. */ | |
5122 | for (dataptr = database; | |
5123 | dataptr < database + datasize; | |
5124 | /* nothing */) | |
5125 | { | |
5126 | char blocktype; | |
5127 | unsigned short mlen; | |
5128 | ||
5129 | if (dataptr == trace_buffer_wrap) | |
5130 | { | |
5131 | /* Adjust to reflect wrapping part of the frame around to | |
5132 | the beginning. */ | |
5133 | datasize = dataptr - database; | |
5134 | dataptr = database = trace_buffer_lo; | |
5135 | } | |
b3b9301e | 5136 | |
219f2f23 PA |
5137 | blocktype = *dataptr++; |
5138 | ||
b3b9301e | 5139 | if ((*callback) (blocktype, dataptr, data)) |
219f2f23 PA |
5140 | return dataptr; |
5141 | ||
5142 | switch (blocktype) | |
5143 | { | |
5144 | case 'R': | |
5145 | /* Skip over the registers block. */ | |
3aee8918 | 5146 | dataptr += current_target_desc ()->registers_size; |
219f2f23 PA |
5147 | break; |
5148 | case 'M': | |
5149 | /* Skip over the memory block. */ | |
5150 | dataptr += sizeof (CORE_ADDR); | |
5151 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5152 | dataptr += (sizeof (mlen) + mlen); | |
5153 | break; | |
219f2f23 PA |
5154 | case 'V': |
5155 | /* Skip over the TSV block. */ | |
5156 | dataptr += (sizeof (int) + sizeof (LONGEST)); | |
5157 | break; | |
0fb4aa4b PA |
5158 | case 'S': |
5159 | /* Skip over the static trace data block. */ | |
5160 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5161 | dataptr += (sizeof (mlen) + mlen); | |
5162 | break; | |
219f2f23 PA |
5163 | default: |
5164 | trace_debug ("traceframe %d has unknown block type 0x%x", | |
5165 | tfnum, blocktype); | |
5166 | return NULL; | |
5167 | } | |
5168 | } | |
5169 | ||
5170 | return NULL; | |
5171 | } | |
5172 | ||
b3b9301e PA |
5173 | /* Look for the block of type TYPE_WANTED in the trameframe starting |
5174 | at DATABASE of DATASIZE bytes long. TFNUM is the traceframe | |
5175 | number. */ | |
5176 | ||
5177 | static unsigned char * | |
5178 | traceframe_find_block_type (unsigned char *database, unsigned int datasize, | |
5179 | int tfnum, char type_wanted) | |
5180 | { | |
5181 | return traceframe_walk_blocks (database, datasize, tfnum, | |
5182 | match_blocktype, &type_wanted); | |
5183 | } | |
5184 | ||
219f2f23 PA |
5185 | static unsigned char * |
5186 | traceframe_find_regblock (struct traceframe *tframe, int tfnum) | |
5187 | { | |
5188 | unsigned char *regblock; | |
5189 | ||
5190 | regblock = traceframe_find_block_type (tframe->data, | |
5191 | tframe->data_size, | |
5192 | tfnum, 'R'); | |
5193 | ||
5194 | if (regblock == NULL) | |
5195 | trace_debug ("traceframe %d has no register data", tfnum); | |
5196 | ||
5197 | return regblock; | |
5198 | } | |
5199 | ||
5200 | /* Get registers from a traceframe. */ | |
5201 | ||
5202 | int | |
5203 | fetch_traceframe_registers (int tfnum, struct regcache *regcache, int regnum) | |
5204 | { | |
5205 | unsigned char *dataptr; | |
5206 | struct tracepoint *tpoint; | |
5207 | struct traceframe *tframe; | |
5208 | ||
5209 | tframe = find_traceframe (tfnum); | |
5210 | ||
5211 | if (tframe == NULL) | |
5212 | { | |
5213 | trace_debug ("traceframe %d not found", tfnum); | |
5214 | return 1; | |
5215 | } | |
5216 | ||
5217 | dataptr = traceframe_find_regblock (tframe, tfnum); | |
5218 | if (dataptr == NULL) | |
5219 | { | |
1c79eb8a | 5220 | /* Mark registers unavailable. */ |
219f2f23 PA |
5221 | supply_regblock (regcache, NULL); |
5222 | ||
5223 | /* We can generally guess at a PC, although this will be | |
5224 | misleading for while-stepping frames and multi-location | |
5225 | tracepoints. */ | |
5226 | tpoint = find_next_tracepoint_by_number (NULL, tframe->tpnum); | |
5227 | if (tpoint != NULL) | |
5228 | regcache_write_pc (regcache, tpoint->address); | |
5229 | } | |
5230 | else | |
5231 | supply_regblock (regcache, dataptr); | |
5232 | ||
5233 | return 0; | |
5234 | } | |
5235 | ||
5236 | static CORE_ADDR | |
5237 | traceframe_get_pc (struct traceframe *tframe) | |
5238 | { | |
5239 | struct regcache regcache; | |
5240 | unsigned char *dataptr; | |
3aee8918 | 5241 | const struct target_desc *tdesc = current_target_desc (); |
219f2f23 PA |
5242 | |
5243 | dataptr = traceframe_find_regblock (tframe, -1); | |
5244 | if (dataptr == NULL) | |
5245 | return 0; | |
5246 | ||
3aee8918 | 5247 | init_register_cache (®cache, tdesc, dataptr); |
219f2f23 PA |
5248 | return regcache_read_pc (®cache); |
5249 | } | |
5250 | ||
5251 | /* Read a requested block of memory from a trace frame. */ | |
5252 | ||
5253 | int | |
5254 | traceframe_read_mem (int tfnum, CORE_ADDR addr, | |
5255 | unsigned char *buf, ULONGEST length, | |
5256 | ULONGEST *nbytes) | |
5257 | { | |
5258 | struct traceframe *tframe; | |
5259 | unsigned char *database, *dataptr; | |
5260 | unsigned int datasize; | |
5261 | CORE_ADDR maddr; | |
5262 | unsigned short mlen; | |
5263 | ||
5264 | trace_debug ("traceframe_read_mem"); | |
5265 | ||
5266 | tframe = find_traceframe (tfnum); | |
5267 | ||
5268 | if (!tframe) | |
5269 | { | |
5270 | trace_debug ("traceframe %d not found", tfnum); | |
5271 | return 1; | |
5272 | } | |
5273 | ||
5274 | datasize = tframe->data_size; | |
5275 | database = dataptr = &tframe->data[0]; | |
5276 | ||
5277 | /* Iterate through a traceframe's blocks, looking for memory. */ | |
5278 | while ((dataptr = traceframe_find_block_type (dataptr, | |
493e2a69 MS |
5279 | datasize |
5280 | - (dataptr - database), | |
219f2f23 PA |
5281 | tfnum, 'M')) != NULL) |
5282 | { | |
5283 | memcpy (&maddr, dataptr, sizeof (maddr)); | |
5284 | dataptr += sizeof (maddr); | |
5285 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5286 | dataptr += sizeof (mlen); | |
5287 | trace_debug ("traceframe %d has %d bytes at %s", | |
5288 | tfnum, mlen, paddress (maddr)); | |
5289 | ||
764880b7 PA |
5290 | /* If the block includes the first part of the desired range, |
5291 | return as much it has; GDB will re-request the remainder, | |
5292 | which might be in a different block of this trace frame. */ | |
5293 | if (maddr <= addr && addr < (maddr + mlen)) | |
219f2f23 | 5294 | { |
764880b7 PA |
5295 | ULONGEST amt = (maddr + mlen) - addr; |
5296 | if (amt > length) | |
5297 | amt = length; | |
5298 | ||
5299 | memcpy (buf, dataptr + (addr - maddr), amt); | |
5300 | *nbytes = amt; | |
219f2f23 PA |
5301 | return 0; |
5302 | } | |
5303 | ||
5304 | /* Skip over this block. */ | |
5305 | dataptr += mlen; | |
5306 | } | |
5307 | ||
5308 | trace_debug ("traceframe %d has no memory data for the desired region", | |
5309 | tfnum); | |
5310 | ||
5311 | *nbytes = 0; | |
5312 | return 0; | |
5313 | } | |
5314 | ||
5315 | static int | |
5316 | traceframe_read_tsv (int tsvnum, LONGEST *val) | |
5317 | { | |
5318 | int tfnum; | |
5319 | struct traceframe *tframe; | |
5320 | unsigned char *database, *dataptr; | |
5321 | unsigned int datasize; | |
5322 | int vnum; | |
8ddb1965 | 5323 | int found = 0; |
219f2f23 PA |
5324 | |
5325 | trace_debug ("traceframe_read_tsv"); | |
5326 | ||
5327 | tfnum = current_traceframe; | |
5328 | ||
5329 | if (tfnum < 0) | |
5330 | { | |
5331 | trace_debug ("no current traceframe"); | |
5332 | return 1; | |
5333 | } | |
5334 | ||
5335 | tframe = find_traceframe (tfnum); | |
5336 | ||
5337 | if (tframe == NULL) | |
5338 | { | |
5339 | trace_debug ("traceframe %d not found", tfnum); | |
5340 | return 1; | |
5341 | } | |
5342 | ||
5343 | datasize = tframe->data_size; | |
5344 | database = dataptr = &tframe->data[0]; | |
5345 | ||
8ddb1965 YQ |
5346 | /* Iterate through a traceframe's blocks, looking for the last |
5347 | matched tsv. */ | |
219f2f23 | 5348 | while ((dataptr = traceframe_find_block_type (dataptr, |
493e2a69 MS |
5349 | datasize |
5350 | - (dataptr - database), | |
219f2f23 PA |
5351 | tfnum, 'V')) != NULL) |
5352 | { | |
5353 | memcpy (&vnum, dataptr, sizeof (vnum)); | |
5354 | dataptr += sizeof (vnum); | |
5355 | ||
5356 | trace_debug ("traceframe %d has variable %d", tfnum, vnum); | |
5357 | ||
5358 | /* Check that this is the variable we want. */ | |
5359 | if (tsvnum == vnum) | |
5360 | { | |
5361 | memcpy (val, dataptr, sizeof (*val)); | |
8ddb1965 | 5362 | found = 1; |
219f2f23 PA |
5363 | } |
5364 | ||
5365 | /* Skip over this block. */ | |
5366 | dataptr += sizeof (LONGEST); | |
5367 | } | |
5368 | ||
8ddb1965 YQ |
5369 | if (!found) |
5370 | trace_debug ("traceframe %d has no data for variable %d", | |
5371 | tfnum, tsvnum); | |
5372 | return !found; | |
219f2f23 PA |
5373 | } |
5374 | ||
0fb4aa4b PA |
5375 | /* Read a requested block of static tracepoint data from a trace |
5376 | frame. */ | |
5377 | ||
5378 | int | |
5379 | traceframe_read_sdata (int tfnum, ULONGEST offset, | |
5380 | unsigned char *buf, ULONGEST length, | |
5381 | ULONGEST *nbytes) | |
5382 | { | |
5383 | struct traceframe *tframe; | |
5384 | unsigned char *database, *dataptr; | |
5385 | unsigned int datasize; | |
5386 | unsigned short mlen; | |
5387 | ||
5388 | trace_debug ("traceframe_read_sdata"); | |
5389 | ||
5390 | tframe = find_traceframe (tfnum); | |
5391 | ||
5392 | if (!tframe) | |
5393 | { | |
5394 | trace_debug ("traceframe %d not found", tfnum); | |
5395 | return 1; | |
5396 | } | |
5397 | ||
5398 | datasize = tframe->data_size; | |
5399 | database = &tframe->data[0]; | |
5400 | ||
5401 | /* Iterate through a traceframe's blocks, looking for static | |
5402 | tracepoint data. */ | |
5403 | dataptr = traceframe_find_block_type (database, datasize, | |
5404 | tfnum, 'S'); | |
5405 | if (dataptr != NULL) | |
5406 | { | |
5407 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5408 | dataptr += sizeof (mlen); | |
5409 | if (offset < mlen) | |
5410 | { | |
5411 | if (offset + length > mlen) | |
5412 | length = mlen - offset; | |
5413 | ||
5414 | memcpy (buf, dataptr, length); | |
5415 | *nbytes = length; | |
5416 | } | |
5417 | else | |
5418 | *nbytes = 0; | |
5419 | return 0; | |
5420 | } | |
5421 | ||
5422 | trace_debug ("traceframe %d has no static trace data", tfnum); | |
5423 | ||
5424 | *nbytes = 0; | |
5425 | return 0; | |
5426 | } | |
5427 | ||
b3b9301e PA |
5428 | /* Callback for traceframe_walk_blocks. Builds a traceframe-info |
5429 | object. DATA is pointer to a struct buffer holding the | |
5430 | traceframe-info object being built. */ | |
5431 | ||
5432 | static int | |
5433 | build_traceframe_info_xml (char blocktype, unsigned char *dataptr, void *data) | |
5434 | { | |
5435 | struct buffer *buffer = data; | |
5436 | ||
5437 | switch (blocktype) | |
5438 | { | |
5439 | case 'M': | |
5440 | { | |
5441 | unsigned short mlen; | |
5442 | CORE_ADDR maddr; | |
5443 | ||
5444 | memcpy (&maddr, dataptr, sizeof (maddr)); | |
5445 | dataptr += sizeof (maddr); | |
5446 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5447 | dataptr += sizeof (mlen); | |
5448 | buffer_xml_printf (buffer, | |
5449 | "<memory start=\"0x%s\" length=\"0x%s\"/>\n", | |
5450 | paddress (maddr), phex_nz (mlen, sizeof (mlen))); | |
5451 | break; | |
5452 | } | |
5453 | case 'V': | |
28a93511 YQ |
5454 | { |
5455 | int vnum; | |
5456 | ||
5457 | memcpy (&vnum, dataptr, sizeof (vnum)); | |
5458 | buffer_xml_printf (buffer, "<tvar id=\"%d\"/>\n", vnum); | |
5459 | break; | |
5460 | } | |
b3b9301e PA |
5461 | case 'R': |
5462 | case 'S': | |
5463 | { | |
5464 | break; | |
5465 | } | |
5466 | default: | |
5467 | warning ("Unhandled trace block type (%d) '%c ' " | |
5468 | "while building trace frame info.", | |
5469 | blocktype, blocktype); | |
5470 | break; | |
5471 | } | |
5472 | ||
5473 | return 0; | |
5474 | } | |
5475 | ||
5476 | /* Build a traceframe-info object for traceframe number TFNUM into | |
5477 | BUFFER. */ | |
5478 | ||
5479 | int | |
5480 | traceframe_read_info (int tfnum, struct buffer *buffer) | |
5481 | { | |
5482 | struct traceframe *tframe; | |
5483 | ||
5484 | trace_debug ("traceframe_read_info"); | |
5485 | ||
5486 | tframe = find_traceframe (tfnum); | |
5487 | ||
5488 | if (!tframe) | |
5489 | { | |
5490 | trace_debug ("traceframe %d not found", tfnum); | |
5491 | return 1; | |
5492 | } | |
5493 | ||
5494 | buffer_grow_str (buffer, "<traceframe-info>\n"); | |
5495 | traceframe_walk_blocks (tframe->data, tframe->data_size, | |
5496 | tfnum, build_traceframe_info_xml, buffer); | |
5497 | buffer_grow_str0 (buffer, "</traceframe-info>\n"); | |
5498 | return 0; | |
5499 | } | |
5500 | ||
fa593d66 PA |
5501 | /* Return the first fast tracepoint whose jump pad contains PC. */ |
5502 | ||
5503 | static struct tracepoint * | |
5504 | fast_tracepoint_from_jump_pad_address (CORE_ADDR pc) | |
5505 | { | |
5506 | struct tracepoint *tpoint; | |
5507 | ||
5508 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
5509 | if (tpoint->type == fast_tracepoint) | |
5510 | if (tpoint->jump_pad <= pc && pc < tpoint->jump_pad_end) | |
5511 | return tpoint; | |
5512 | ||
5513 | return NULL; | |
5514 | } | |
5515 | ||
405f8e94 SS |
5516 | /* Return the first fast tracepoint whose trampoline contains PC. */ |
5517 | ||
5518 | static struct tracepoint * | |
5519 | fast_tracepoint_from_trampoline_address (CORE_ADDR pc) | |
5520 | { | |
5521 | struct tracepoint *tpoint; | |
5522 | ||
5523 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
5524 | { | |
5525 | if (tpoint->type == fast_tracepoint | |
5526 | && tpoint->trampoline <= pc && pc < tpoint->trampoline_end) | |
5527 | return tpoint; | |
5528 | } | |
5529 | ||
5530 | return NULL; | |
5531 | } | |
5532 | ||
fa593d66 PA |
5533 | /* Return GDBserver's tracepoint that matches the IP Agent's |
5534 | tracepoint object that lives at IPA_TPOINT_OBJ in the IP Agent's | |
5535 | address space. */ | |
5536 | ||
5537 | static struct tracepoint * | |
5538 | fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR ipa_tpoint_obj) | |
5539 | { | |
5540 | struct tracepoint *tpoint; | |
5541 | ||
5542 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
5543 | if (tpoint->type == fast_tracepoint) | |
5544 | if (tpoint->obj_addr_on_target == ipa_tpoint_obj) | |
5545 | return tpoint; | |
5546 | ||
5547 | return NULL; | |
5548 | } | |
5549 | ||
5550 | #endif | |
5551 | ||
5552 | /* The type of the object that is used to synchronize fast tracepoint | |
5553 | collection. */ | |
5554 | ||
5555 | typedef struct collecting_t | |
5556 | { | |
5557 | /* The fast tracepoint number currently collecting. */ | |
5558 | uintptr_t tpoint; | |
5559 | ||
5560 | /* A number that GDBserver can use to identify the thread that is | |
5561 | presently holding the collect lock. This need not (and usually | |
5562 | is not) the thread id, as getting the current thread ID usually | |
5563 | requires a system call, which we want to avoid like the plague. | |
5564 | Usually this is thread's TCB, found in the TLS (pseudo-) | |
5565 | register, which is readable with a single insn on several | |
5566 | architectures. */ | |
5567 | uintptr_t thread_area; | |
5568 | } collecting_t; | |
5569 | ||
5570 | #ifndef IN_PROCESS_AGENT | |
5571 | ||
5572 | void | |
5573 | force_unlock_trace_buffer (void) | |
5574 | { | |
5575 | write_inferior_data_pointer (ipa_sym_addrs.addr_collecting, 0); | |
5576 | } | |
5577 | ||
5578 | /* Check if the thread identified by THREAD_AREA which is stopped at | |
5579 | STOP_PC, is presently locking the fast tracepoint collection, and | |
5580 | if so, gather some status of said collection. Returns 0 if the | |
5581 | thread isn't collecting or in the jump pad at all. 1, if in the | |
5582 | jump pad (or within gdb_collect) and hasn't executed the adjusted | |
5583 | original insn yet (can set a breakpoint there and run to it). 2, | |
5584 | if presently executing the adjusted original insn --- in which | |
5585 | case, if we want to move the thread out of the jump pad, we need to | |
5586 | single-step it until this function returns 0. */ | |
5587 | ||
5588 | int | |
5589 | fast_tracepoint_collecting (CORE_ADDR thread_area, | |
5590 | CORE_ADDR stop_pc, | |
5591 | struct fast_tpoint_collect_status *status) | |
5592 | { | |
5593 | CORE_ADDR ipa_collecting; | |
5594 | CORE_ADDR ipa_gdb_jump_pad_buffer, ipa_gdb_jump_pad_buffer_end; | |
405f8e94 SS |
5595 | CORE_ADDR ipa_gdb_trampoline_buffer; |
5596 | CORE_ADDR ipa_gdb_trampoline_buffer_end; | |
fa593d66 PA |
5597 | struct tracepoint *tpoint; |
5598 | int needs_breakpoint; | |
5599 | ||
5600 | /* The thread THREAD_AREA is either: | |
5601 | ||
5602 | 0. not collecting at all, not within the jump pad, or within | |
5603 | gdb_collect or one of its callees. | |
5604 | ||
5605 | 1. in the jump pad and haven't reached gdb_collect | |
5606 | ||
5607 | 2. within gdb_collect (out of the jump pad) (collect is set) | |
5608 | ||
5609 | 3. we're in the jump pad, after gdb_collect having returned, | |
5610 | possibly executing the adjusted insns. | |
5611 | ||
5612 | For cases 1 and 3, `collecting' may or not be set. The jump pad | |
5613 | doesn't have any complicated jump logic, so we can tell if the | |
5614 | thread is executing the adjust original insn or not by just | |
5615 | matching STOP_PC with known jump pad addresses. If we it isn't | |
5616 | yet executing the original insn, set a breakpoint there, and let | |
5617 | the thread run to it, so to quickly step over a possible (many | |
5618 | insns) gdb_collect call. Otherwise, or when the breakpoint is | |
5619 | hit, only a few (small number of) insns are left to be executed | |
5620 | in the jump pad. Single-step the thread until it leaves the | |
5621 | jump pad. */ | |
5622 | ||
5623 | again: | |
5624 | tpoint = NULL; | |
5625 | needs_breakpoint = 0; | |
5626 | trace_debug ("fast_tracepoint_collecting"); | |
5627 | ||
5628 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer, | |
5629 | &ipa_gdb_jump_pad_buffer)) | |
38e08fca GB |
5630 | { |
5631 | internal_error (__FILE__, __LINE__, | |
5632 | "error extracting `gdb_jump_pad_buffer'"); | |
5633 | } | |
fa593d66 PA |
5634 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer_end, |
5635 | &ipa_gdb_jump_pad_buffer_end)) | |
38e08fca GB |
5636 | { |
5637 | internal_error (__FILE__, __LINE__, | |
5638 | "error extracting `gdb_jump_pad_buffer_end'"); | |
5639 | } | |
fa593d66 | 5640 | |
405f8e94 SS |
5641 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer, |
5642 | &ipa_gdb_trampoline_buffer)) | |
38e08fca GB |
5643 | { |
5644 | internal_error (__FILE__, __LINE__, | |
5645 | "error extracting `gdb_trampoline_buffer'"); | |
5646 | } | |
405f8e94 SS |
5647 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_end, |
5648 | &ipa_gdb_trampoline_buffer_end)) | |
38e08fca GB |
5649 | { |
5650 | internal_error (__FILE__, __LINE__, | |
5651 | "error extracting `gdb_trampoline_buffer_end'"); | |
5652 | } | |
405f8e94 | 5653 | |
493e2a69 MS |
5654 | if (ipa_gdb_jump_pad_buffer <= stop_pc |
5655 | && stop_pc < ipa_gdb_jump_pad_buffer_end) | |
fa593d66 PA |
5656 | { |
5657 | /* We can tell which tracepoint(s) the thread is collecting by | |
5658 | matching the jump pad address back to the tracepoint. */ | |
5659 | tpoint = fast_tracepoint_from_jump_pad_address (stop_pc); | |
5660 | if (tpoint == NULL) | |
5661 | { | |
5662 | warning ("in jump pad, but no matching tpoint?"); | |
5663 | return 0; | |
5664 | } | |
5665 | else | |
5666 | { | |
5667 | trace_debug ("in jump pad of tpoint (%d, %s); jump_pad(%s, %s); " | |
5668 | "adj_insn(%s, %s)", | |
5669 | tpoint->number, paddress (tpoint->address), | |
5670 | paddress (tpoint->jump_pad), | |
5671 | paddress (tpoint->jump_pad_end), | |
5672 | paddress (tpoint->adjusted_insn_addr), | |
5673 | paddress (tpoint->adjusted_insn_addr_end)); | |
5674 | } | |
5675 | ||
5676 | /* Definitely in the jump pad. May or may not need | |
5677 | fast-exit-jump-pad breakpoint. */ | |
5678 | if (tpoint->jump_pad <= stop_pc | |
5679 | && stop_pc < tpoint->adjusted_insn_addr) | |
5680 | needs_breakpoint = 1; | |
5681 | } | |
405f8e94 SS |
5682 | else if (ipa_gdb_trampoline_buffer <= stop_pc |
5683 | && stop_pc < ipa_gdb_trampoline_buffer_end) | |
5684 | { | |
5685 | /* We can tell which tracepoint(s) the thread is collecting by | |
5686 | matching the trampoline address back to the tracepoint. */ | |
5687 | tpoint = fast_tracepoint_from_trampoline_address (stop_pc); | |
5688 | if (tpoint == NULL) | |
5689 | { | |
5690 | warning ("in trampoline, but no matching tpoint?"); | |
5691 | return 0; | |
5692 | } | |
5693 | else | |
5694 | { | |
5695 | trace_debug ("in trampoline of tpoint (%d, %s); trampoline(%s, %s)", | |
5696 | tpoint->number, paddress (tpoint->address), | |
5697 | paddress (tpoint->trampoline), | |
5698 | paddress (tpoint->trampoline_end)); | |
5699 | } | |
5700 | ||
5701 | /* Have not reached jump pad yet, but treat the trampoline as a | |
5702 | part of the jump pad that is before the adjusted original | |
5703 | instruction. */ | |
5704 | needs_breakpoint = 1; | |
5705 | } | |
fa593d66 PA |
5706 | else |
5707 | { | |
5708 | collecting_t ipa_collecting_obj; | |
5709 | ||
5710 | /* If `collecting' is set/locked, then the THREAD_AREA thread | |
5711 | may or not be the one holding the lock. We have to read the | |
5712 | lock to find out. */ | |
5713 | ||
5714 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_collecting, | |
5715 | &ipa_collecting)) | |
5716 | { | |
5717 | trace_debug ("fast_tracepoint_collecting:" | |
5718 | " failed reading 'collecting' in the inferior"); | |
5719 | return 0; | |
5720 | } | |
5721 | ||
5722 | if (!ipa_collecting) | |
5723 | { | |
5724 | trace_debug ("fast_tracepoint_collecting: not collecting" | |
5725 | " (and nobody is)."); | |
5726 | return 0; | |
5727 | } | |
5728 | ||
5729 | /* Some thread is collecting. Check which. */ | |
5730 | if (read_inferior_memory (ipa_collecting, | |
5731 | (unsigned char *) &ipa_collecting_obj, | |
5732 | sizeof (ipa_collecting_obj)) != 0) | |
5733 | goto again; | |
5734 | ||
5735 | if (ipa_collecting_obj.thread_area != thread_area) | |
5736 | { | |
5737 | trace_debug ("fast_tracepoint_collecting: not collecting " | |
5738 | "(another thread is)"); | |
5739 | return 0; | |
5740 | } | |
5741 | ||
5742 | tpoint | |
5743 | = fast_tracepoint_from_ipa_tpoint_address (ipa_collecting_obj.tpoint); | |
5744 | if (tpoint == NULL) | |
5745 | { | |
5746 | warning ("fast_tracepoint_collecting: collecting, " | |
5747 | "but tpoint %s not found?", | |
5748 | paddress ((CORE_ADDR) ipa_collecting_obj.tpoint)); | |
5749 | return 0; | |
5750 | } | |
5751 | ||
5752 | /* The thread is within `gdb_collect', skip over the rest of | |
5753 | fast tracepoint collection quickly using a breakpoint. */ | |
5754 | needs_breakpoint = 1; | |
5755 | } | |
5756 | ||
5757 | /* The caller wants a bit of status detail. */ | |
5758 | if (status != NULL) | |
5759 | { | |
5760 | status->tpoint_num = tpoint->number; | |
5761 | status->tpoint_addr = tpoint->address; | |
5762 | status->adjusted_insn_addr = tpoint->adjusted_insn_addr; | |
5763 | status->adjusted_insn_addr_end = tpoint->adjusted_insn_addr_end; | |
5764 | } | |
5765 | ||
5766 | if (needs_breakpoint) | |
5767 | { | |
5768 | /* Hasn't executed the original instruction yet. Set breakpoint | |
5769 | there, and wait till it's hit, then single-step until exiting | |
5770 | the jump pad. */ | |
5771 | ||
5772 | trace_debug ("\ | |
5773 | fast_tracepoint_collecting, returning continue-until-break at %s", | |
5774 | paddress (tpoint->adjusted_insn_addr)); | |
5775 | ||
5776 | return 1; /* continue */ | |
5777 | } | |
5778 | else | |
5779 | { | |
5780 | /* Just single-step until exiting the jump pad. */ | |
5781 | ||
5782 | trace_debug ("fast_tracepoint_collecting, returning " | |
5783 | "need-single-step (%s-%s)", | |
5784 | paddress (tpoint->adjusted_insn_addr), | |
5785 | paddress (tpoint->adjusted_insn_addr_end)); | |
5786 | ||
5787 | return 2; /* single-step */ | |
5788 | } | |
5789 | } | |
5790 | ||
5791 | #endif | |
5792 | ||
5793 | #ifdef IN_PROCESS_AGENT | |
5794 | ||
5795 | /* The global fast tracepoint collect lock. Points to a collecting_t | |
5796 | object built on the stack by the jump pad, if presently locked; | |
5797 | NULL if it isn't locked. Note that this lock *must* be set while | |
5798 | executing any *function other than the jump pad. See | |
5799 | fast_tracepoint_collecting. */ | |
5800 | static collecting_t * ATTR_USED collecting; | |
5801 | ||
5802 | /* This routine, called from the jump pad (in asm) is designed to be | |
5803 | called from the jump pads of fast tracepoints, thus it is on the | |
5804 | critical path. */ | |
5805 | ||
5806 | IP_AGENT_EXPORT void ATTR_USED | |
5807 | gdb_collect (struct tracepoint *tpoint, unsigned char *regs) | |
5808 | { | |
5809 | struct fast_tracepoint_ctx ctx; | |
5810 | ||
5811 | /* Don't do anything until the trace run is completely set up. */ | |
5812 | if (!tracing) | |
5813 | return; | |
5814 | ||
5815 | ctx.base.type = fast_tracepoint; | |
5816 | ctx.regs = regs; | |
5817 | ctx.regcache_initted = 0; | |
fa593d66 PA |
5818 | /* Wrap the regblock in a register cache (in the stack, we don't |
5819 | want to malloc here). */ | |
3aee8918 | 5820 | ctx.regspace = alloca (ipa_tdesc->registers_size); |
fa593d66 PA |
5821 | if (ctx.regspace == NULL) |
5822 | { | |
5823 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
5824 | return; | |
5825 | } | |
5826 | ||
a59306a3 YQ |
5827 | for (ctx.tpoint = tpoint; |
5828 | ctx.tpoint != NULL && ctx.tpoint->address == tpoint->address; | |
5829 | ctx.tpoint = ctx.tpoint->next) | |
fa593d66 | 5830 | { |
a59306a3 YQ |
5831 | if (!ctx.tpoint->enabled) |
5832 | continue; | |
fa593d66 | 5833 | |
a59306a3 YQ |
5834 | /* Multiple tracepoints of different types, such as fast tracepoint and |
5835 | static tracepoint, can be set at the same address. */ | |
5836 | if (ctx.tpoint->type != tpoint->type) | |
5837 | continue; | |
5838 | ||
5839 | /* Test the condition if present, and collect if true. */ | |
5840 | if (ctx.tpoint->cond == NULL | |
5841 | || condition_true_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
5842 | ctx.tpoint)) | |
5843 | { | |
5844 | collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
5845 | ctx.tpoint->address, ctx.tpoint); | |
5846 | ||
5847 | /* Note that this will cause original insns to be written back | |
5848 | to where we jumped from, but that's OK because we're jumping | |
5849 | back to the next whole instruction. This will go badly if | |
5850 | instruction restoration is not atomic though. */ | |
5851 | if (stopping_tracepoint | |
5852 | || trace_buffer_is_full | |
5853 | || expr_eval_result != expr_eval_no_error) | |
5854 | { | |
5855 | stop_tracing (); | |
5856 | break; | |
5857 | } | |
5858 | } | |
5859 | else | |
5860 | { | |
5861 | /* If there was a condition and it evaluated to false, the only | |
5862 | way we would stop tracing is if there was an error during | |
5863 | condition expression evaluation. */ | |
5864 | if (expr_eval_result != expr_eval_no_error) | |
5865 | { | |
5866 | stop_tracing (); | |
5867 | break; | |
5868 | } | |
5869 | } | |
fa593d66 PA |
5870 | } |
5871 | } | |
5872 | ||
5873 | #endif | |
5874 | ||
5875 | #ifndef IN_PROCESS_AGENT | |
5876 | ||
6a271cae PA |
5877 | CORE_ADDR |
5878 | get_raw_reg_func_addr (void) | |
5879 | { | |
5880 | return ipa_sym_addrs.addr_get_raw_reg; | |
5881 | } | |
5882 | ||
5e1dc496 LM |
5883 | CORE_ADDR |
5884 | get_get_tsv_func_addr (void) | |
6b9801d4 | 5885 | { |
5e1dc496 | 5886 | return ipa_sym_addrs.addr_get_trace_state_variable_value; |
6b9801d4 SS |
5887 | } |
5888 | ||
5e1dc496 LM |
5889 | CORE_ADDR |
5890 | get_set_tsv_func_addr (void) | |
6b9801d4 | 5891 | { |
5e1dc496 | 5892 | return ipa_sym_addrs.addr_set_trace_state_variable_value; |
6b9801d4 SS |
5893 | } |
5894 | ||
6a271cae | 5895 | static void |
493e2a69 MS |
5896 | compile_tracepoint_condition (struct tracepoint *tpoint, |
5897 | CORE_ADDR *jump_entry) | |
6a271cae PA |
5898 | { |
5899 | CORE_ADDR entry_point = *jump_entry; | |
5900 | enum eval_result_type err; | |
5901 | ||
5902 | trace_debug ("Starting condition compilation for tracepoint %d\n", | |
5903 | tpoint->number); | |
5904 | ||
5905 | /* Initialize the global pointer to the code being built. */ | |
5906 | current_insn_ptr = *jump_entry; | |
5907 | ||
5908 | emit_prologue (); | |
5909 | ||
5910 | err = compile_bytecodes (tpoint->cond); | |
5911 | ||
5912 | if (err == expr_eval_no_error) | |
5913 | { | |
5914 | emit_epilogue (); | |
5915 | ||
5916 | /* Record the beginning of the compiled code. */ | |
5917 | tpoint->compiled_cond = entry_point; | |
5918 | ||
5919 | trace_debug ("Condition compilation for tracepoint %d complete\n", | |
5920 | tpoint->number); | |
5921 | } | |
5922 | else | |
5923 | { | |
5924 | /* Leave the unfinished code in situ, but don't point to it. */ | |
5925 | ||
5926 | tpoint->compiled_cond = 0; | |
5927 | ||
5928 | trace_debug ("Condition compilation for tracepoint %d failed, " | |
5929 | "error code %d", | |
5930 | tpoint->number, err); | |
5931 | } | |
5932 | ||
5933 | /* Update the code pointer passed in. Note that we do this even if | |
5934 | the compile fails, so that we can look at the partial results | |
5935 | instead of letting them be overwritten. */ | |
5936 | *jump_entry = current_insn_ptr; | |
5937 | ||
5938 | /* Leave a gap, to aid dump decipherment. */ | |
5939 | *jump_entry += 16; | |
5940 | } | |
5941 | ||
fa593d66 PA |
5942 | /* We'll need to adjust these when we consider bi-arch setups, and big |
5943 | endian machines. */ | |
5944 | ||
5945 | static int | |
5946 | write_inferior_data_ptr (CORE_ADDR where, CORE_ADDR ptr) | |
5947 | { | |
5948 | return write_inferior_memory (where, | |
5949 | (unsigned char *) &ptr, sizeof (void *)); | |
5950 | } | |
5951 | ||
5952 | /* The base pointer of the IPA's heap. This is the only memory the | |
5953 | IPA is allowed to use. The IPA should _not_ call the inferior's | |
5954 | `malloc' during operation. That'd be slow, and, most importantly, | |
5955 | it may not be safe. We may be collecting a tracepoint in a signal | |
5956 | handler, for example. */ | |
5957 | static CORE_ADDR target_tp_heap; | |
5958 | ||
5959 | /* Allocate at least SIZE bytes of memory from the IPA heap, aligned | |
5960 | to 8 bytes. */ | |
5961 | ||
5962 | static CORE_ADDR | |
5963 | target_malloc (ULONGEST size) | |
5964 | { | |
5965 | CORE_ADDR ptr; | |
5966 | ||
5967 | if (target_tp_heap == 0) | |
5968 | { | |
5969 | /* We have the pointer *address*, need what it points to. */ | |
5970 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_tp_heap_buffer, | |
5971 | &target_tp_heap)) | |
38e08fca GB |
5972 | { |
5973 | internal_error (__FILE__, __LINE__, | |
5974 | "couldn't get target heap head pointer"); | |
5975 | } | |
fa593d66 PA |
5976 | } |
5977 | ||
5978 | ptr = target_tp_heap; | |
5979 | target_tp_heap += size; | |
5980 | ||
5981 | /* Pad to 8-byte alignment. */ | |
5982 | target_tp_heap = ((target_tp_heap + 7) & ~0x7); | |
5983 | ||
5984 | return ptr; | |
5985 | } | |
5986 | ||
5987 | static CORE_ADDR | |
5988 | download_agent_expr (struct agent_expr *expr) | |
5989 | { | |
5990 | CORE_ADDR expr_addr; | |
5991 | CORE_ADDR expr_bytes; | |
5992 | ||
5993 | expr_addr = target_malloc (sizeof (*expr)); | |
5994 | write_inferior_memory (expr_addr, (unsigned char *) expr, sizeof (*expr)); | |
5995 | ||
5996 | expr_bytes = target_malloc (expr->length); | |
5997 | write_inferior_data_ptr (expr_addr + offsetof (struct agent_expr, bytes), | |
5998 | expr_bytes); | |
5999 | write_inferior_memory (expr_bytes, expr->bytes, expr->length); | |
6000 | ||
6001 | return expr_addr; | |
6002 | } | |
6003 | ||
6004 | /* Align V up to N bits. */ | |
6005 | #define UALIGN(V, N) (((V) + ((N) - 1)) & ~((N) - 1)) | |
6006 | ||
5c73ff4e YQ |
6007 | /* Sync tracepoint with IPA, but leave maintenance of linked list to caller. */ |
6008 | ||
fa593d66 | 6009 | static void |
5c73ff4e | 6010 | download_tracepoint_1 (struct tracepoint *tpoint) |
fa593d66 | 6011 | { |
5c73ff4e YQ |
6012 | struct tracepoint target_tracepoint; |
6013 | CORE_ADDR tpptr = 0; | |
fa593d66 | 6014 | |
5c73ff4e YQ |
6015 | gdb_assert (tpoint->type == fast_tracepoint |
6016 | || tpoint->type == static_tracepoint); | |
fa593d66 | 6017 | |
5c73ff4e | 6018 | if (tpoint->cond != NULL && target_emit_ops () != NULL) |
fa593d66 | 6019 | { |
5c73ff4e | 6020 | CORE_ADDR jentry, jump_entry; |
fa593d66 | 6021 | |
5c73ff4e | 6022 | jentry = jump_entry = get_jump_space_head (); |
fa593d66 | 6023 | |
5c73ff4e | 6024 | if (tpoint->cond != NULL) |
6a271cae | 6025 | { |
5c73ff4e YQ |
6026 | /* Pad to 8-byte alignment. (needed?) */ |
6027 | /* Actually this should be left for the target to | |
6028 | decide. */ | |
6029 | jentry = UALIGN (jentry, 8); | |
6030 | ||
6031 | compile_tracepoint_condition (tpoint, &jentry); | |
6032 | } | |
6033 | ||
6034 | /* Pad to 8-byte alignment. */ | |
6035 | jentry = UALIGN (jentry, 8); | |
6036 | claim_jump_space (jentry - jump_entry); | |
6037 | } | |
6a271cae | 6038 | |
5c73ff4e | 6039 | target_tracepoint = *tpoint; |
6a271cae | 6040 | |
5c73ff4e YQ |
6041 | tpptr = target_malloc (sizeof (*tpoint)); |
6042 | tpoint->obj_addr_on_target = tpptr; | |
6043 | ||
6044 | /* Write the whole object. We'll fix up its pointers in a bit. | |
6045 | Assume no next for now. This is fixed up above on the next | |
6046 | iteration, if there's any. */ | |
6047 | target_tracepoint.next = NULL; | |
6048 | /* Need to clear this here too, since we're downloading the | |
6049 | tracepoints before clearing our own copy. */ | |
6050 | target_tracepoint.hit_count = 0; | |
6051 | ||
6052 | write_inferior_memory (tpptr, (unsigned char *) &target_tracepoint, | |
6053 | sizeof (target_tracepoint)); | |
6054 | ||
6055 | if (tpoint->cond) | |
6056 | write_inferior_data_ptr (tpptr + offsetof (struct tracepoint, | |
6057 | cond), | |
6058 | download_agent_expr (tpoint->cond)); | |
6059 | ||
6060 | if (tpoint->numactions) | |
6061 | { | |
6062 | int i; | |
6063 | CORE_ADDR actions_array; | |
6064 | ||
6065 | /* The pointers array. */ | |
6066 | actions_array | |
6067 | = target_malloc (sizeof (*tpoint->actions) * tpoint->numactions); | |
6068 | write_inferior_data_ptr (tpptr + offsetof (struct tracepoint, | |
6069 | actions), | |
6070 | actions_array); | |
6071 | ||
6072 | /* Now for each pointer, download the action. */ | |
6073 | for (i = 0; i < tpoint->numactions; i++) | |
6074 | { | |
5c73ff4e | 6075 | struct tracepoint_action *action = tpoint->actions[i]; |
8d0d92cd | 6076 | CORE_ADDR ipa_action = action->ops->download (action); |
6a271cae | 6077 | |
5c73ff4e YQ |
6078 | if (ipa_action != 0) |
6079 | write_inferior_data_ptr | |
fd0a4d76 | 6080 | (actions_array + i * sizeof (*tpoint->actions), |
5c73ff4e | 6081 | ipa_action); |
6a271cae | 6082 | } |
5c73ff4e YQ |
6083 | } |
6084 | } | |
6a271cae | 6085 | |
42476b70 YQ |
6086 | #define IPA_PROTO_FAST_TRACE_FLAG 0 |
6087 | #define IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET 2 | |
6088 | #define IPA_PROTO_FAST_TRACE_JUMP_PAD 10 | |
6089 | #define IPA_PROTO_FAST_TRACE_FJUMP_SIZE 18 | |
6090 | #define IPA_PROTO_FAST_TRACE_FJUMP_INSN 22 | |
6091 | ||
6092 | /* Send a command to agent to download and install tracepoint TPOINT. */ | |
6093 | ||
6094 | static int | |
6095 | tracepoint_send_agent (struct tracepoint *tpoint) | |
6096 | { | |
6097 | char buf[IPA_CMD_BUF_SIZE]; | |
6098 | char *p; | |
6099 | int i, ret; | |
6100 | ||
6101 | p = buf; | |
6102 | strcpy (p, "FastTrace:"); | |
6103 | p += 10; | |
6104 | ||
6105 | COPY_FIELD_TO_BUF (p, tpoint, number); | |
6106 | COPY_FIELD_TO_BUF (p, tpoint, address); | |
6107 | COPY_FIELD_TO_BUF (p, tpoint, type); | |
6108 | COPY_FIELD_TO_BUF (p, tpoint, enabled); | |
6109 | COPY_FIELD_TO_BUF (p, tpoint, step_count); | |
6110 | COPY_FIELD_TO_BUF (p, tpoint, pass_count); | |
6111 | COPY_FIELD_TO_BUF (p, tpoint, numactions); | |
6112 | COPY_FIELD_TO_BUF (p, tpoint, hit_count); | |
6113 | COPY_FIELD_TO_BUF (p, tpoint, traceframe_usage); | |
6114 | COPY_FIELD_TO_BUF (p, tpoint, compiled_cond); | |
6115 | COPY_FIELD_TO_BUF (p, tpoint, orig_size); | |
6116 | ||
6117 | /* condition */ | |
6118 | p = agent_expr_send (p, tpoint->cond); | |
6119 | ||
6120 | /* tracepoint_action */ | |
6121 | for (i = 0; i < tpoint->numactions; i++) | |
6122 | { | |
6123 | struct tracepoint_action *action = tpoint->actions[i]; | |
6124 | ||
6125 | p[0] = action->type; | |
6126 | p = action->ops->send (&p[1], action); | |
6127 | } | |
6128 | ||
6129 | get_jump_space_head (); | |
6130 | /* Copy the value of GDB_JUMP_PAD_HEAD to command buffer, so that | |
6131 | agent can use jump pad from it. */ | |
6132 | if (tpoint->type == fast_tracepoint) | |
6133 | { | |
6134 | memcpy (p, &gdb_jump_pad_head, 8); | |
6135 | p += 8; | |
6136 | } | |
6137 | ||
6138 | ret = run_inferior_command (buf, (int) (ptrdiff_t) (p - buf)); | |
6139 | if (ret) | |
6140 | return ret; | |
6141 | ||
6142 | if (strncmp (buf, "OK", 2) != 0) | |
6143 | return 1; | |
6144 | ||
6145 | /* The value of tracepoint's target address is stored in BUF. */ | |
6146 | memcpy (&tpoint->obj_addr_on_target, | |
6147 | &buf[IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET], 8); | |
6148 | ||
6149 | if (tpoint->type == fast_tracepoint) | |
6150 | { | |
6151 | unsigned char *insn | |
6152 | = (unsigned char *) &buf[IPA_PROTO_FAST_TRACE_FJUMP_INSN]; | |
6153 | int fjump_size; | |
6154 | ||
6155 | trace_debug ("agent: read from cmd_buf 0x%x 0x%x\n", | |
6156 | (unsigned int) tpoint->obj_addr_on_target, | |
6157 | (unsigned int) gdb_jump_pad_head); | |
6158 | ||
6159 | memcpy (&gdb_jump_pad_head, &buf[IPA_PROTO_FAST_TRACE_JUMP_PAD], 8); | |
6160 | ||
6161 | /* This has been done in agent. We should also set up record for it. */ | |
6162 | memcpy (&fjump_size, &buf[IPA_PROTO_FAST_TRACE_FJUMP_SIZE], 4); | |
6163 | /* Wire it in. */ | |
6164 | tpoint->handle | |
6165 | = set_fast_tracepoint_jump (tpoint->address, insn, fjump_size); | |
6166 | } | |
6167 | ||
6168 | return 0; | |
6169 | } | |
6170 | ||
1e4d1764 YQ |
6171 | static void |
6172 | download_tracepoint (struct tracepoint *tpoint) | |
6173 | { | |
6174 | struct tracepoint *tp, *tp_prev; | |
6175 | ||
6176 | if (tpoint->type != fast_tracepoint | |
6177 | && tpoint->type != static_tracepoint) | |
6178 | return; | |
6179 | ||
6180 | download_tracepoint_1 (tpoint); | |
6181 | ||
6182 | /* Find the previous entry of TPOINT, which is fast tracepoint or | |
6183 | static tracepoint. */ | |
6184 | tp_prev = NULL; | |
6185 | for (tp = tracepoints; tp != tpoint; tp = tp->next) | |
6186 | { | |
6187 | if (tp->type == fast_tracepoint || tp->type == static_tracepoint) | |
6188 | tp_prev = tp; | |
6189 | } | |
6190 | ||
6191 | if (tp_prev) | |
6192 | { | |
6193 | CORE_ADDR tp_prev_target_next_addr; | |
6194 | ||
6195 | /* Insert TPOINT after TP_PREV in IPA. */ | |
6196 | if (read_inferior_data_pointer (tp_prev->obj_addr_on_target | |
6197 | + offsetof (struct tracepoint, next), | |
6198 | &tp_prev_target_next_addr)) | |
38e08fca GB |
6199 | { |
6200 | internal_error (__FILE__, __LINE__, | |
6201 | "error reading `tp_prev->next'"); | |
6202 | } | |
1e4d1764 YQ |
6203 | |
6204 | /* tpoint->next = tp_prev->next */ | |
6205 | write_inferior_data_ptr (tpoint->obj_addr_on_target | |
6206 | + offsetof (struct tracepoint, next), | |
6207 | tp_prev_target_next_addr); | |
6208 | /* tp_prev->next = tpoint */ | |
6209 | write_inferior_data_ptr (tp_prev->obj_addr_on_target | |
6210 | + offsetof (struct tracepoint, next), | |
6211 | tpoint->obj_addr_on_target); | |
6212 | } | |
6213 | else | |
6214 | /* First object in list, set the head pointer in the | |
6215 | inferior. */ | |
6216 | write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints, | |
6217 | tpoint->obj_addr_on_target); | |
6218 | ||
6219 | } | |
6220 | ||
fa593d66 PA |
6221 | static void |
6222 | download_trace_state_variables (void) | |
6223 | { | |
6224 | CORE_ADDR ptr = 0, prev_ptr = 0; | |
6225 | struct trace_state_variable *tsv; | |
6226 | ||
6227 | /* Start out empty. */ | |
6228 | write_inferior_data_ptr (ipa_sym_addrs.addr_trace_state_variables, 0); | |
6229 | ||
6230 | for (tsv = trace_state_variables; tsv != NULL; tsv = tsv->next) | |
6231 | { | |
6232 | struct trace_state_variable target_tsv; | |
6233 | ||
6234 | /* TSV's with a getter have been initialized equally in both the | |
6235 | inferior and GDBserver. Skip them. */ | |
6236 | if (tsv->getter != NULL) | |
6237 | continue; | |
6238 | ||
6239 | target_tsv = *tsv; | |
6240 | ||
6241 | prev_ptr = ptr; | |
6242 | ptr = target_malloc (sizeof (*tsv)); | |
6243 | ||
6244 | if (tsv == trace_state_variables) | |
6245 | { | |
6246 | /* First object in list, set the head pointer in the | |
6247 | inferior. */ | |
6248 | ||
6249 | write_inferior_data_ptr (ipa_sym_addrs.addr_trace_state_variables, | |
6250 | ptr); | |
6251 | } | |
6252 | else | |
6253 | { | |
6254 | write_inferior_data_ptr (prev_ptr | |
6255 | + offsetof (struct trace_state_variable, | |
6256 | next), | |
6257 | ptr); | |
6258 | } | |
6259 | ||
6260 | /* Write the whole object. We'll fix up its pointers in a bit. | |
6261 | Assume no next, fixup when needed. */ | |
6262 | target_tsv.next = NULL; | |
6263 | ||
6264 | write_inferior_memory (ptr, (unsigned char *) &target_tsv, | |
6265 | sizeof (target_tsv)); | |
6266 | ||
6267 | if (tsv->name != NULL) | |
6268 | { | |
6269 | size_t size = strlen (tsv->name) + 1; | |
6270 | CORE_ADDR name_addr = target_malloc (size); | |
6271 | write_inferior_memory (name_addr, | |
6272 | (unsigned char *) tsv->name, size); | |
6273 | write_inferior_data_ptr (ptr | |
6274 | + offsetof (struct trace_state_variable, | |
6275 | name), | |
6276 | name_addr); | |
6277 | } | |
6278 | ||
38e08fca | 6279 | gdb_assert (tsv->getter == NULL); |
fa593d66 PA |
6280 | } |
6281 | ||
6282 | if (prev_ptr != 0) | |
6283 | { | |
6284 | /* Fixup the next pointer in the last item in the list. */ | |
493e2a69 MS |
6285 | write_inferior_data_ptr (prev_ptr |
6286 | + offsetof (struct trace_state_variable, | |
6287 | next), 0); | |
fa593d66 PA |
6288 | } |
6289 | } | |
6290 | ||
6291 | /* Upload complete trace frames out of the IP Agent's trace buffer | |
6292 | into GDBserver's trace buffer. This always uploads either all or | |
6293 | no trace frames. This is the counter part of | |
6294 | `trace_alloc_trace_buffer'. See its description of the atomic | |
6295 | synching mechanism. */ | |
6296 | ||
6297 | static void | |
6298 | upload_fast_traceframes (void) | |
6299 | { | |
6300 | unsigned int ipa_traceframe_read_count, ipa_traceframe_write_count; | |
6301 | unsigned int ipa_traceframe_read_count_racy, ipa_traceframe_write_count_racy; | |
6302 | CORE_ADDR tf; | |
6303 | struct ipa_trace_buffer_control ipa_trace_buffer_ctrl; | |
6304 | unsigned int curr_tbctrl_idx; | |
6305 | unsigned int ipa_trace_buffer_ctrl_curr; | |
6306 | unsigned int ipa_trace_buffer_ctrl_curr_old; | |
6307 | CORE_ADDR ipa_trace_buffer_ctrl_addr; | |
6308 | struct breakpoint *about_to_request_buffer_space_bkpt; | |
6309 | CORE_ADDR ipa_trace_buffer_lo; | |
6310 | CORE_ADDR ipa_trace_buffer_hi; | |
6311 | ||
6312 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, | |
6313 | &ipa_traceframe_read_count_racy)) | |
6314 | { | |
6315 | /* This will happen in most targets if the current thread is | |
6316 | running. */ | |
6317 | return; | |
6318 | } | |
6319 | ||
6320 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, | |
6321 | &ipa_traceframe_write_count_racy)) | |
6322 | return; | |
6323 | ||
6324 | trace_debug ("ipa_traceframe_count (racy area): %d (w=%d, r=%d)", | |
493e2a69 MS |
6325 | ipa_traceframe_write_count_racy |
6326 | - ipa_traceframe_read_count_racy, | |
6327 | ipa_traceframe_write_count_racy, | |
6328 | ipa_traceframe_read_count_racy); | |
fa593d66 PA |
6329 | |
6330 | if (ipa_traceframe_write_count_racy == ipa_traceframe_read_count_racy) | |
6331 | return; | |
6332 | ||
6333 | about_to_request_buffer_space_bkpt | |
6334 | = set_breakpoint_at (ipa_sym_addrs.addr_about_to_request_buffer_space, | |
6335 | NULL); | |
6336 | ||
6337 | if (read_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, | |
6338 | &ipa_trace_buffer_ctrl_curr)) | |
6339 | return; | |
6340 | ||
6341 | ipa_trace_buffer_ctrl_curr_old = ipa_trace_buffer_ctrl_curr; | |
6342 | ||
6343 | curr_tbctrl_idx = ipa_trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK; | |
6344 | ||
6345 | { | |
6346 | unsigned int prev, counter; | |
6347 | ||
6348 | /* Update the token, with new counters, and the GDBserver stamp | |
6349 | bit. Alway reuse the current TBC index. */ | |
2ece8244 YQ |
6350 | prev = ipa_trace_buffer_ctrl_curr & GDBSERVER_FLUSH_COUNT_MASK_CURR; |
6351 | counter = (prev + 0x100) & GDBSERVER_FLUSH_COUNT_MASK_CURR; | |
fa593d66 | 6352 | |
2ece8244 | 6353 | ipa_trace_buffer_ctrl_curr = (GDBSERVER_UPDATED_FLUSH_COUNT_BIT |
fa593d66 PA |
6354 | | (prev << 12) |
6355 | | counter | |
6356 | | curr_tbctrl_idx); | |
6357 | } | |
6358 | ||
6359 | if (write_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, | |
6360 | ipa_trace_buffer_ctrl_curr)) | |
6361 | return; | |
6362 | ||
6363 | trace_debug ("Lib: Committed %08x -> %08x", | |
6364 | ipa_trace_buffer_ctrl_curr_old, | |
6365 | ipa_trace_buffer_ctrl_curr); | |
6366 | ||
6367 | /* Re-read these, now that we've installed the | |
6368 | `about_to_request_buffer_space' breakpoint/lock. A thread could | |
6369 | have finished a traceframe between the last read of these | |
6370 | counters and setting the breakpoint above. If we start | |
6371 | uploading, we never want to leave this function with | |
6372 | traceframe_read_count != 0, otherwise, GDBserver could end up | |
6373 | incrementing the counter tokens more than once (due to event loop | |
6374 | nesting), which would break the IP agent's "effective" detection | |
6375 | (see trace_alloc_trace_buffer). */ | |
6376 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, | |
6377 | &ipa_traceframe_read_count)) | |
6378 | return; | |
6379 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, | |
6380 | &ipa_traceframe_write_count)) | |
6381 | return; | |
6382 | ||
6383 | if (debug_threads) | |
6384 | { | |
6385 | trace_debug ("ipa_traceframe_count (blocked area): %d (w=%d, r=%d)", | |
6386 | ipa_traceframe_write_count - ipa_traceframe_read_count, | |
6387 | ipa_traceframe_write_count, ipa_traceframe_read_count); | |
6388 | ||
6389 | if (ipa_traceframe_write_count != ipa_traceframe_write_count_racy | |
6390 | || ipa_traceframe_read_count != ipa_traceframe_read_count_racy) | |
6391 | trace_debug ("note that ipa_traceframe_count's parts changed"); | |
6392 | } | |
6393 | ||
6394 | /* Get the address of the current TBC object (the IP agent has an | |
6395 | array of 3 such objects). The index is stored in the TBC | |
6396 | token. */ | |
6397 | ipa_trace_buffer_ctrl_addr = ipa_sym_addrs.addr_trace_buffer_ctrl; | |
6398 | ipa_trace_buffer_ctrl_addr | |
6399 | += sizeof (struct ipa_trace_buffer_control) * curr_tbctrl_idx; | |
6400 | ||
6401 | if (read_inferior_memory (ipa_trace_buffer_ctrl_addr, | |
6402 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
6403 | sizeof (struct ipa_trace_buffer_control))) | |
6404 | return; | |
6405 | ||
6406 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_lo, | |
6407 | &ipa_trace_buffer_lo)) | |
6408 | return; | |
6409 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_hi, | |
6410 | &ipa_trace_buffer_hi)) | |
6411 | return; | |
6412 | ||
6413 | /* Offsets are easier to grok for debugging than raw addresses, | |
6414 | especially for the small trace buffer sizes that are useful for | |
6415 | testing. */ | |
6416 | trace_debug ("Lib: Trace buffer [%d] start=%d free=%d " | |
6417 | "endfree=%d wrap=%d hi=%d", | |
6418 | curr_tbctrl_idx, | |
6419 | (int) (ipa_trace_buffer_ctrl.start - ipa_trace_buffer_lo), | |
6420 | (int) (ipa_trace_buffer_ctrl.free - ipa_trace_buffer_lo), | |
6421 | (int) (ipa_trace_buffer_ctrl.end_free - ipa_trace_buffer_lo), | |
6422 | (int) (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo), | |
6423 | (int) (ipa_trace_buffer_hi - ipa_trace_buffer_lo)); | |
6424 | ||
6425 | /* Note that the IPA's buffer is always circular. */ | |
6426 | ||
6427 | #define IPA_FIRST_TRACEFRAME() (ipa_trace_buffer_ctrl.start) | |
6428 | ||
6429 | #define IPA_NEXT_TRACEFRAME_1(TF, TFOBJ) \ | |
6430 | ((TF) + sizeof (struct traceframe) + (TFOBJ)->data_size) | |
6431 | ||
6432 | #define IPA_NEXT_TRACEFRAME(TF, TFOBJ) \ | |
6433 | (IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) \ | |
6434 | - ((IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) >= ipa_trace_buffer_ctrl.wrap) \ | |
6435 | ? (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo) \ | |
6436 | : 0)) | |
6437 | ||
6438 | tf = IPA_FIRST_TRACEFRAME (); | |
6439 | ||
6440 | while (ipa_traceframe_write_count - ipa_traceframe_read_count) | |
6441 | { | |
6442 | struct tracepoint *tpoint; | |
6443 | struct traceframe *tframe; | |
6444 | unsigned char *block; | |
6445 | struct traceframe ipa_tframe; | |
6446 | ||
6447 | if (read_inferior_memory (tf, (unsigned char *) &ipa_tframe, | |
6448 | offsetof (struct traceframe, data))) | |
6449 | error ("Uploading: couldn't read traceframe at %s\n", paddress (tf)); | |
6450 | ||
6451 | if (ipa_tframe.tpnum == 0) | |
38e08fca GB |
6452 | { |
6453 | internal_error (__FILE__, __LINE__, | |
6454 | "Uploading: No (more) fast traceframes, but" | |
6455 | " ipa_traceframe_count == %u??\n", | |
6456 | ipa_traceframe_write_count | |
6457 | - ipa_traceframe_read_count); | |
6458 | } | |
fa593d66 PA |
6459 | |
6460 | /* Note that this will be incorrect for multi-location | |
6461 | tracepoints... */ | |
6462 | tpoint = find_next_tracepoint_by_number (NULL, ipa_tframe.tpnum); | |
6463 | ||
6464 | tframe = add_traceframe (tpoint); | |
6465 | if (tframe == NULL) | |
6466 | { | |
6467 | trace_buffer_is_full = 1; | |
6468 | trace_debug ("Uploading: trace buffer is full"); | |
6469 | } | |
6470 | else | |
6471 | { | |
6472 | /* Copy the whole set of blocks in one go for now. FIXME: | |
6473 | split this in smaller blocks. */ | |
5ae4861a YQ |
6474 | block = add_traceframe_block (tframe, tpoint, |
6475 | ipa_tframe.data_size); | |
fa593d66 PA |
6476 | if (block != NULL) |
6477 | { | |
493e2a69 MS |
6478 | if (read_inferior_memory (tf |
6479 | + offsetof (struct traceframe, data), | |
fa593d66 PA |
6480 | block, ipa_tframe.data_size)) |
6481 | error ("Uploading: Couldn't read traceframe data at %s\n", | |
6482 | paddress (tf + offsetof (struct traceframe, data))); | |
6483 | } | |
6484 | ||
6485 | trace_debug ("Uploading: traceframe didn't fit"); | |
6486 | finish_traceframe (tframe); | |
6487 | } | |
6488 | ||
6489 | tf = IPA_NEXT_TRACEFRAME (tf, &ipa_tframe); | |
6490 | ||
6491 | /* If we freed the traceframe that wrapped around, go back | |
6492 | to the non-wrap case. */ | |
6493 | if (tf < ipa_trace_buffer_ctrl.start) | |
6494 | { | |
6495 | trace_debug ("Lib: Discarding past the wraparound"); | |
6496 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
6497 | } | |
6498 | ipa_trace_buffer_ctrl.start = tf; | |
6499 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_ctrl.start; | |
6500 | ++ipa_traceframe_read_count; | |
6501 | ||
6502 | if (ipa_trace_buffer_ctrl.start == ipa_trace_buffer_ctrl.free | |
6503 | && ipa_trace_buffer_ctrl.start == ipa_trace_buffer_ctrl.end_free) | |
6504 | { | |
6505 | trace_debug ("Lib: buffer is fully empty. " | |
6506 | "Trace buffer [%d] start=%d free=%d endfree=%d", | |
6507 | curr_tbctrl_idx, | |
6508 | (int) (ipa_trace_buffer_ctrl.start | |
6509 | - ipa_trace_buffer_lo), | |
6510 | (int) (ipa_trace_buffer_ctrl.free | |
6511 | - ipa_trace_buffer_lo), | |
6512 | (int) (ipa_trace_buffer_ctrl.end_free | |
6513 | - ipa_trace_buffer_lo)); | |
6514 | ||
6515 | ipa_trace_buffer_ctrl.start = ipa_trace_buffer_lo; | |
6516 | ipa_trace_buffer_ctrl.free = ipa_trace_buffer_lo; | |
6517 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_hi; | |
6518 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
6519 | } | |
6520 | ||
6521 | trace_debug ("Uploaded a traceframe\n" | |
6522 | "Lib: Trace buffer [%d] start=%d free=%d " | |
6523 | "endfree=%d wrap=%d hi=%d", | |
6524 | curr_tbctrl_idx, | |
6525 | (int) (ipa_trace_buffer_ctrl.start - ipa_trace_buffer_lo), | |
6526 | (int) (ipa_trace_buffer_ctrl.free - ipa_trace_buffer_lo), | |
493e2a69 MS |
6527 | (int) (ipa_trace_buffer_ctrl.end_free |
6528 | - ipa_trace_buffer_lo), | |
fa593d66 PA |
6529 | (int) (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo), |
6530 | (int) (ipa_trace_buffer_hi - ipa_trace_buffer_lo)); | |
6531 | } | |
6532 | ||
6533 | if (write_inferior_memory (ipa_trace_buffer_ctrl_addr, | |
6534 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
6535 | sizeof (struct ipa_trace_buffer_control))) | |
6536 | return; | |
6537 | ||
6538 | write_inferior_integer (ipa_sym_addrs.addr_traceframe_read_count, | |
6539 | ipa_traceframe_read_count); | |
6540 | ||
6541 | trace_debug ("Done uploading traceframes [%d]\n", curr_tbctrl_idx); | |
6542 | ||
6543 | pause_all (1); | |
fa593d66 PA |
6544 | |
6545 | delete_breakpoint (about_to_request_buffer_space_bkpt); | |
6546 | about_to_request_buffer_space_bkpt = NULL; | |
6547 | ||
6548 | unpause_all (1); | |
6549 | ||
6550 | if (trace_buffer_is_full) | |
6551 | stop_tracing (); | |
6552 | } | |
6553 | #endif | |
6554 | ||
6555 | #ifdef IN_PROCESS_AGENT | |
6556 | ||
0fb4aa4b | 6557 | IP_AGENT_EXPORT int ust_loaded; |
2fa291ac | 6558 | IP_AGENT_EXPORT char cmd_buf[IPA_CMD_BUF_SIZE]; |
fa593d66 | 6559 | |
0fb4aa4b | 6560 | #ifdef HAVE_UST |
fa593d66 | 6561 | |
0fb4aa4b PA |
6562 | /* Static tracepoints. */ |
6563 | ||
6564 | /* UST puts a "struct tracepoint" in the global namespace, which | |
6565 | conflicts with our tracepoint. Arguably, being a library, it | |
6566 | shouldn't take ownership of such a generic name. We work around it | |
6567 | here. */ | |
6568 | #define tracepoint ust_tracepoint | |
6569 | #include <ust/ust.h> | |
6570 | #undef tracepoint | |
6571 | ||
6572 | extern int serialize_to_text (char *outbuf, int bufsize, | |
6573 | const char *fmt, va_list ap); | |
6574 | ||
6575 | #define GDB_PROBE_NAME "gdb" | |
6576 | ||
6577 | /* We dynamically search for the UST symbols instead of linking them | |
6578 | in. This lets the user decide if the application uses static | |
6579 | tracepoints, instead of always pulling libust.so in. This vector | |
6580 | holds pointers to all functions we care about. */ | |
6581 | ||
6582 | static struct | |
fa593d66 | 6583 | { |
0fb4aa4b PA |
6584 | int (*serialize_to_text) (char *outbuf, int bufsize, |
6585 | const char *fmt, va_list ap); | |
6586 | ||
6587 | int (*ltt_probe_register) (struct ltt_available_probe *pdata); | |
6588 | int (*ltt_probe_unregister) (struct ltt_available_probe *pdata); | |
6589 | ||
6590 | int (*ltt_marker_connect) (const char *channel, const char *mname, | |
6591 | const char *pname); | |
6592 | int (*ltt_marker_disconnect) (const char *channel, const char *mname, | |
6593 | const char *pname); | |
6594 | ||
6595 | void (*marker_iter_start) (struct marker_iter *iter); | |
6596 | void (*marker_iter_next) (struct marker_iter *iter); | |
6597 | void (*marker_iter_stop) (struct marker_iter *iter); | |
6598 | void (*marker_iter_reset) (struct marker_iter *iter); | |
6599 | } ust_ops; | |
6600 | ||
6601 | #include <dlfcn.h> | |
6602 | ||
6603 | /* Cast through typeof to catch incompatible API changes. Since UST | |
6604 | only builds with gcc, we can freely use gcc extensions here | |
6605 | too. */ | |
6606 | #define GET_UST_SYM(SYM) \ | |
6607 | do \ | |
6608 | { \ | |
6609 | if (ust_ops.SYM == NULL) \ | |
6610 | ust_ops.SYM = (typeof (&SYM)) dlsym (RTLD_DEFAULT, #SYM); \ | |
6611 | if (ust_ops.SYM == NULL) \ | |
6612 | return 0; \ | |
6613 | } while (0) | |
6614 | ||
6615 | #define USTF(SYM) ust_ops.SYM | |
6616 | ||
6617 | /* Get pointers to all libust.so functions we care about. */ | |
6618 | ||
6619 | static int | |
6620 | dlsym_ust (void) | |
6621 | { | |
6622 | GET_UST_SYM (serialize_to_text); | |
6623 | ||
6624 | GET_UST_SYM (ltt_probe_register); | |
6625 | GET_UST_SYM (ltt_probe_unregister); | |
6626 | GET_UST_SYM (ltt_marker_connect); | |
6627 | GET_UST_SYM (ltt_marker_disconnect); | |
6628 | ||
6629 | GET_UST_SYM (marker_iter_start); | |
6630 | GET_UST_SYM (marker_iter_next); | |
6631 | GET_UST_SYM (marker_iter_stop); | |
6632 | GET_UST_SYM (marker_iter_reset); | |
6633 | ||
6634 | ust_loaded = 1; | |
6635 | return 1; | |
fa593d66 PA |
6636 | } |
6637 | ||
0fb4aa4b PA |
6638 | /* Given an UST marker, return the matching gdb static tracepoint. |
6639 | The match is done by address. */ | |
6640 | ||
6641 | static struct tracepoint * | |
6642 | ust_marker_to_static_tracepoint (const struct marker *mdata) | |
6643 | { | |
6644 | struct tracepoint *tpoint; | |
6645 | ||
6646 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
6647 | { | |
d248b706 | 6648 | if (tpoint->type != static_tracepoint) |
0fb4aa4b PA |
6649 | continue; |
6650 | ||
6651 | if (tpoint->address == (uintptr_t) mdata->location) | |
6652 | return tpoint; | |
6653 | } | |
6654 | ||
6655 | return NULL; | |
6656 | } | |
6657 | ||
6658 | /* The probe function we install on lttng/ust markers. Whenever a | |
6659 | probed ust marker is hit, this function is called. This is similar | |
6660 | to gdb_collect, only for static tracepoints, instead of fast | |
6661 | tracepoints. */ | |
6662 | ||
6663 | static void | |
6664 | gdb_probe (const struct marker *mdata, void *probe_private, | |
6665 | struct registers *regs, void *call_private, | |
6666 | const char *fmt, va_list *args) | |
6667 | { | |
6668 | struct tracepoint *tpoint; | |
6669 | struct static_tracepoint_ctx ctx; | |
6670 | ||
6671 | /* Don't do anything until the trace run is completely set up. */ | |
6672 | if (!tracing) | |
6673 | { | |
6674 | trace_debug ("gdb_probe: not tracing\n"); | |
6675 | return; | |
6676 | } | |
6677 | ||
6678 | ctx.base.type = static_tracepoint; | |
6679 | ctx.regcache_initted = 0; | |
6680 | ctx.regs = regs; | |
6681 | ctx.fmt = fmt; | |
6682 | ctx.args = args; | |
6683 | ||
6684 | /* Wrap the regblock in a register cache (in the stack, we don't | |
6685 | want to malloc here). */ | |
3aee8918 | 6686 | ctx.regspace = alloca (ipa_tdesc->registers_size); |
0fb4aa4b PA |
6687 | if (ctx.regspace == NULL) |
6688 | { | |
6689 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
6690 | return; | |
6691 | } | |
6692 | ||
6693 | tpoint = ust_marker_to_static_tracepoint (mdata); | |
6694 | if (tpoint == NULL) | |
6695 | { | |
6696 | trace_debug ("gdb_probe: marker not known: " | |
6697 | "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"", | |
6698 | mdata->location, mdata->channel, | |
6699 | mdata->name, mdata->format); | |
6700 | return; | |
6701 | } | |
6702 | ||
d248b706 KY |
6703 | if (!tpoint->enabled) |
6704 | { | |
6705 | trace_debug ("gdb_probe: tracepoint disabled"); | |
6706 | return; | |
6707 | } | |
6708 | ||
0fb4aa4b PA |
6709 | ctx.tpoint = tpoint; |
6710 | ||
6711 | trace_debug ("gdb_probe: collecting marker: " | |
6712 | "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"", | |
6713 | mdata->location, mdata->channel, | |
6714 | mdata->name, mdata->format); | |
6715 | ||
6716 | /* Test the condition if present, and collect if true. */ | |
6717 | if (tpoint->cond == NULL | |
6718 | || condition_true_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
6719 | tpoint)) | |
6720 | { | |
6721 | collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
6722 | tpoint->address, tpoint); | |
6723 | ||
6724 | if (stopping_tracepoint | |
6725 | || trace_buffer_is_full | |
6726 | || expr_eval_result != expr_eval_no_error) | |
6727 | stop_tracing (); | |
6728 | } | |
6729 | else | |
6730 | { | |
6731 | /* If there was a condition and it evaluated to false, the only | |
6732 | way we would stop tracing is if there was an error during | |
6733 | condition expression evaluation. */ | |
6734 | if (expr_eval_result != expr_eval_no_error) | |
6735 | stop_tracing (); | |
6736 | } | |
6737 | } | |
6738 | ||
6739 | /* Called if the gdb static tracepoint requested collecting "$_sdata", | |
6740 | static tracepoint string data. This is a string passed to the | |
6741 | tracing library by the user, at the time of the tracepoint marker | |
6742 | call. E.g., in the UST marker call: | |
6743 | ||
6744 | trace_mark (ust, bar33, "str %s", "FOOBAZ"); | |
6745 | ||
6746 | the collected data is "str FOOBAZ". | |
6747 | */ | |
6748 | ||
6749 | static void | |
6750 | collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
0fb4aa4b PA |
6751 | struct traceframe *tframe) |
6752 | { | |
6753 | struct static_tracepoint_ctx *umd = (struct static_tracepoint_ctx *) ctx; | |
6754 | unsigned char *bufspace; | |
6755 | int size; | |
6756 | va_list copy; | |
6757 | unsigned short blocklen; | |
6758 | ||
6759 | if (umd == NULL) | |
6760 | { | |
6761 | trace_debug ("Wanted to collect static trace data, " | |
6762 | "but there's no static trace data"); | |
6763 | return; | |
6764 | } | |
6765 | ||
6766 | va_copy (copy, *umd->args); | |
6767 | size = USTF(serialize_to_text) (NULL, 0, umd->fmt, copy); | |
6768 | va_end (copy); | |
6769 | ||
6770 | trace_debug ("Want to collect ust data"); | |
6771 | ||
6772 | /* 'S' + size + string */ | |
5ae4861a | 6773 | bufspace = add_traceframe_block (tframe, umd->tpoint, |
0fb4aa4b PA |
6774 | 1 + sizeof (blocklen) + size + 1); |
6775 | if (bufspace == NULL) | |
6776 | { | |
6777 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
6778 | return; | |
6779 | } | |
6780 | ||
6781 | /* Identify a static trace data block. */ | |
6782 | *bufspace = 'S'; | |
6783 | ||
6784 | blocklen = size + 1; | |
6785 | memcpy (bufspace + 1, &blocklen, sizeof (blocklen)); | |
6786 | ||
6787 | va_copy (copy, *umd->args); | |
6788 | USTF(serialize_to_text) ((char *) bufspace + 1 + sizeof (blocklen), | |
6789 | size + 1, umd->fmt, copy); | |
6790 | va_end (copy); | |
6791 | ||
6792 | trace_debug ("Storing static tracepoint data in regblock: %s", | |
6793 | bufspace + 1 + sizeof (blocklen)); | |
6794 | } | |
6795 | ||
6796 | /* The probe to register with lttng/ust. */ | |
6797 | static struct ltt_available_probe gdb_ust_probe = | |
6798 | { | |
6799 | GDB_PROBE_NAME, | |
6800 | NULL, | |
6801 | gdb_probe, | |
6802 | }; | |
6803 | ||
6804 | #endif /* HAVE_UST */ | |
6805 | #endif /* IN_PROCESS_AGENT */ | |
6806 | ||
0fb4aa4b PA |
6807 | #ifndef IN_PROCESS_AGENT |
6808 | ||
0fb4aa4b PA |
6809 | /* Ask the in-process agent to run a command. Since we don't want to |
6810 | have to handle the IPA hitting breakpoints while running the | |
6811 | command, we pause all threads, remove all breakpoints, and then set | |
6812 | the helper thread re-running. We communicate with the helper | |
6813 | thread by means of direct memory xfering, and a socket for | |
6814 | synchronization. */ | |
6815 | ||
6816 | static int | |
42476b70 | 6817 | run_inferior_command (char *cmd, int len) |
0fb4aa4b PA |
6818 | { |
6819 | int err = -1; | |
fbd5db48 | 6820 | int pid = ptid_get_pid (current_ptid); |
0fb4aa4b PA |
6821 | |
6822 | trace_debug ("run_inferior_command: running: %s", cmd); | |
6823 | ||
6824 | pause_all (0); | |
6825 | uninsert_all_breakpoints (); | |
6826 | ||
42476b70 | 6827 | err = agent_run_command (pid, (const char *) cmd, len); |
0fb4aa4b PA |
6828 | |
6829 | reinsert_all_breakpoints (); | |
6830 | unpause_all (0); | |
6831 | ||
6832 | return err; | |
6833 | } | |
6834 | ||
2fa291ac | 6835 | #else /* !IN_PROCESS_AGENT */ |
0fb4aa4b | 6836 | |
2fa291ac YQ |
6837 | #include <sys/socket.h> |
6838 | #include <sys/un.h> | |
0fb4aa4b | 6839 | |
2fa291ac YQ |
6840 | #ifndef UNIX_PATH_MAX |
6841 | #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path) | |
6842 | #endif | |
0fb4aa4b | 6843 | |
2fa291ac YQ |
6844 | /* Where we put the socked used for synchronization. */ |
6845 | #define SOCK_DIR P_tmpdir | |
0fb4aa4b PA |
6846 | |
6847 | /* Thread ID of the helper thread. GDBserver reads this to know which | |
6848 | is the help thread. This is an LWP id on Linux. */ | |
6849 | int helper_thread_id; | |
6850 | ||
0fb4aa4b PA |
6851 | static int |
6852 | init_named_socket (const char *name) | |
6853 | { | |
6854 | int result, fd; | |
6855 | struct sockaddr_un addr; | |
6856 | ||
6857 | result = fd = socket (PF_UNIX, SOCK_STREAM, 0); | |
6858 | if (result == -1) | |
6859 | { | |
6860 | warning ("socket creation failed: %s", strerror (errno)); | |
6861 | return -1; | |
6862 | } | |
6863 | ||
6864 | addr.sun_family = AF_UNIX; | |
6865 | ||
6866 | strncpy (addr.sun_path, name, UNIX_PATH_MAX); | |
6867 | addr.sun_path[UNIX_PATH_MAX - 1] = '\0'; | |
6868 | ||
6869 | result = access (name, F_OK); | |
6870 | if (result == 0) | |
6871 | { | |
6872 | /* File exists. */ | |
6873 | result = unlink (name); | |
6874 | if (result == -1) | |
6875 | { | |
6876 | warning ("unlink failed: %s", strerror (errno)); | |
6877 | close (fd); | |
6878 | return -1; | |
6879 | } | |
6880 | warning ("socket %s already exists; overwriting", name); | |
6881 | } | |
6882 | ||
6883 | result = bind (fd, (struct sockaddr *) &addr, sizeof (addr)); | |
6884 | if (result == -1) | |
6885 | { | |
6886 | warning ("bind failed: %s", strerror (errno)); | |
6887 | close (fd); | |
6888 | return -1; | |
6889 | } | |
6890 | ||
6891 | result = listen (fd, 1); | |
6892 | if (result == -1) | |
6893 | { | |
6894 | warning ("listen: %s", strerror (errno)); | |
6895 | close (fd); | |
6896 | return -1; | |
6897 | } | |
6898 | ||
6899 | return fd; | |
6900 | } | |
6901 | ||
7255706c YQ |
6902 | static char agent_socket_name[UNIX_PATH_MAX]; |
6903 | ||
0fb4aa4b | 6904 | static int |
2fa291ac | 6905 | gdb_agent_socket_init (void) |
0fb4aa4b PA |
6906 | { |
6907 | int result, fd; | |
0fb4aa4b | 6908 | |
7255706c | 6909 | result = xsnprintf (agent_socket_name, UNIX_PATH_MAX, "%s/gdb_ust%d", |
6cebaf6e | 6910 | SOCK_DIR, getpid ()); |
0fb4aa4b PA |
6911 | if (result >= UNIX_PATH_MAX) |
6912 | { | |
6913 | trace_debug ("string overflow allocating socket name"); | |
6914 | return -1; | |
6915 | } | |
6916 | ||
7255706c | 6917 | fd = init_named_socket (agent_socket_name); |
0fb4aa4b PA |
6918 | if (fd < 0) |
6919 | warning ("Error initializing named socket (%s) for communication with the " | |
6920 | "ust helper thread. Check that directory exists and that it " | |
7255706c | 6921 | "is writable.", agent_socket_name); |
0fb4aa4b PA |
6922 | |
6923 | return fd; | |
6924 | } | |
6925 | ||
2fa291ac | 6926 | #ifdef HAVE_UST |
0fb4aa4b PA |
6927 | |
6928 | /* The next marker to be returned on a qTsSTM command. */ | |
6929 | static const struct marker *next_st; | |
6930 | ||
6931 | /* Returns the first known marker. */ | |
6932 | ||
6933 | struct marker * | |
6934 | first_marker (void) | |
6935 | { | |
6936 | struct marker_iter iter; | |
6937 | ||
6938 | USTF(marker_iter_reset) (&iter); | |
6939 | USTF(marker_iter_start) (&iter); | |
6940 | ||
6941 | return iter.marker; | |
6942 | } | |
6943 | ||
6944 | /* Returns the marker following M. */ | |
6945 | ||
6946 | const struct marker * | |
6947 | next_marker (const struct marker *m) | |
6948 | { | |
6949 | struct marker_iter iter; | |
6950 | ||
6951 | USTF(marker_iter_reset) (&iter); | |
6952 | USTF(marker_iter_start) (&iter); | |
6953 | ||
6954 | for (; iter.marker != NULL; USTF(marker_iter_next) (&iter)) | |
6955 | { | |
6956 | if (iter.marker == m) | |
6957 | { | |
6958 | USTF(marker_iter_next) (&iter); | |
6959 | return iter.marker; | |
6960 | } | |
6961 | } | |
6962 | ||
6963 | return NULL; | |
6964 | } | |
6965 | ||
2fa291ac YQ |
6966 | /* Return an hexstr version of the STR C string, fit for sending to |
6967 | GDB. */ | |
6968 | ||
6969 | static char * | |
6970 | cstr_to_hexstr (const char *str) | |
6971 | { | |
6972 | int len = strlen (str); | |
6973 | char *hexstr = xmalloc (len * 2 + 1); | |
e9371aff | 6974 | bin2hex ((gdb_byte *) str, hexstr, len); |
2fa291ac YQ |
6975 | return hexstr; |
6976 | } | |
6977 | ||
0fb4aa4b PA |
6978 | /* Compose packet that is the response to the qTsSTM/qTfSTM/qTSTMat |
6979 | packets. */ | |
6980 | ||
6981 | static void | |
6982 | response_ust_marker (char *packet, const struct marker *st) | |
6983 | { | |
6984 | char *strid, *format, *tmp; | |
6985 | ||
6986 | next_st = next_marker (st); | |
6987 | ||
6988 | tmp = xmalloc (strlen (st->channel) + 1 + | |
6989 | strlen (st->name) + 1); | |
6990 | sprintf (tmp, "%s/%s", st->channel, st->name); | |
6991 | ||
6992 | strid = cstr_to_hexstr (tmp); | |
6993 | free (tmp); | |
6994 | ||
6995 | format = cstr_to_hexstr (st->format); | |
6996 | ||
6997 | sprintf (packet, "m%s:%s:%s", | |
6998 | paddress ((uintptr_t) st->location), | |
6999 | strid, | |
7000 | format); | |
7001 | ||
7002 | free (strid); | |
7003 | free (format); | |
7004 | } | |
7005 | ||
7006 | /* Return the first static tracepoint, and initialize the state | |
7007 | machine that will iterate through all the static tracepoints. */ | |
7008 | ||
7009 | static void | |
7010 | cmd_qtfstm (char *packet) | |
7011 | { | |
7012 | trace_debug ("Returning first trace state variable definition"); | |
7013 | ||
7014 | if (first_marker ()) | |
7015 | response_ust_marker (packet, first_marker ()); | |
7016 | else | |
7017 | strcpy (packet, "l"); | |
7018 | } | |
7019 | ||
7020 | /* Return additional trace state variable definitions. */ | |
7021 | ||
7022 | static void | |
7023 | cmd_qtsstm (char *packet) | |
7024 | { | |
7025 | trace_debug ("Returning static tracepoint"); | |
7026 | ||
7027 | if (next_st) | |
7028 | response_ust_marker (packet, next_st); | |
7029 | else | |
7030 | strcpy (packet, "l"); | |
7031 | } | |
7032 | ||
7033 | /* Disconnect the GDB probe from a marker at a given address. */ | |
7034 | ||
7035 | static void | |
7036 | unprobe_marker_at (char *packet) | |
7037 | { | |
7038 | char *p = packet; | |
7039 | ULONGEST address; | |
7040 | struct marker_iter iter; | |
7041 | ||
7042 | p += sizeof ("unprobe_marker_at:") - 1; | |
7043 | ||
7044 | p = unpack_varlen_hex (p, &address); | |
7045 | ||
7046 | USTF(marker_iter_reset) (&iter); | |
7047 | USTF(marker_iter_start) (&iter); | |
7048 | for (; iter.marker != NULL; USTF(marker_iter_next) (&iter)) | |
7049 | if ((uintptr_t ) iter.marker->location == address) | |
7050 | { | |
7051 | int result; | |
7052 | ||
7053 | result = USTF(ltt_marker_disconnect) (iter.marker->channel, | |
7054 | iter.marker->name, | |
7055 | GDB_PROBE_NAME); | |
7056 | if (result < 0) | |
7057 | warning ("could not disable marker %s/%s", | |
7058 | iter.marker->channel, iter.marker->name); | |
7059 | break; | |
7060 | } | |
7061 | } | |
7062 | ||
7063 | /* Connect the GDB probe to a marker at a given address. */ | |
7064 | ||
7065 | static int | |
7066 | probe_marker_at (char *packet) | |
7067 | { | |
7068 | char *p = packet; | |
7069 | ULONGEST address; | |
7070 | struct marker_iter iter; | |
7071 | struct marker *m; | |
7072 | ||
7073 | p += sizeof ("probe_marker_at:") - 1; | |
7074 | ||
7075 | p = unpack_varlen_hex (p, &address); | |
7076 | ||
7077 | USTF(marker_iter_reset) (&iter); | |
7078 | ||
7079 | for (USTF(marker_iter_start) (&iter), m = iter.marker; | |
7080 | m != NULL; | |
7081 | USTF(marker_iter_next) (&iter), m = iter.marker) | |
7082 | if ((uintptr_t ) m->location == address) | |
7083 | { | |
7084 | int result; | |
7085 | ||
7086 | trace_debug ("found marker for address. " | |
7087 | "ltt_marker_connect (marker = %s/%s)", | |
7088 | m->channel, m->name); | |
7089 | ||
493e2a69 MS |
7090 | result = USTF(ltt_marker_connect) (m->channel, m->name, |
7091 | GDB_PROBE_NAME); | |
0fb4aa4b PA |
7092 | if (result && result != -EEXIST) |
7093 | trace_debug ("ltt_marker_connect (marker = %s/%s, errno = %d)", | |
7094 | m->channel, m->name, -result); | |
7095 | ||
7096 | if (result < 0) | |
7097 | { | |
7098 | sprintf (packet, "E.could not connect marker: channel=%s, name=%s", | |
7099 | m->channel, m->name); | |
7100 | return -1; | |
7101 | } | |
7102 | ||
7103 | strcpy (packet, "OK"); | |
7104 | return 0; | |
7105 | } | |
7106 | ||
7107 | sprintf (packet, "E.no marker found at 0x%s", paddress (address)); | |
7108 | return -1; | |
7109 | } | |
7110 | ||
7111 | static int | |
7112 | cmd_qtstmat (char *packet) | |
7113 | { | |
7114 | char *p = packet; | |
7115 | ULONGEST address; | |
7116 | struct marker_iter iter; | |
7117 | struct marker *m; | |
7118 | ||
7119 | p += sizeof ("qTSTMat:") - 1; | |
7120 | ||
7121 | p = unpack_varlen_hex (p, &address); | |
7122 | ||
7123 | USTF(marker_iter_reset) (&iter); | |
7124 | ||
7125 | for (USTF(marker_iter_start) (&iter), m = iter.marker; | |
7126 | m != NULL; | |
7127 | USTF(marker_iter_next) (&iter), m = iter.marker) | |
7128 | if ((uintptr_t ) m->location == address) | |
7129 | { | |
7130 | response_ust_marker (packet, m); | |
7131 | return 0; | |
7132 | } | |
7133 | ||
7134 | strcpy (packet, "l"); | |
7135 | return -1; | |
7136 | } | |
7137 | ||
2fa291ac YQ |
7138 | static void |
7139 | gdb_ust_init (void) | |
7140 | { | |
7141 | if (!dlsym_ust ()) | |
7142 | return; | |
7143 | ||
7144 | USTF(ltt_probe_register) (&gdb_ust_probe); | |
7145 | } | |
7146 | ||
7147 | #endif /* HAVE_UST */ | |
7148 | ||
82067193 | 7149 | #include <sys/syscall.h> |
7255706c YQ |
7150 | |
7151 | static void | |
7152 | gdb_agent_remove_socket (void) | |
7153 | { | |
7154 | unlink (agent_socket_name); | |
7155 | } | |
82067193 | 7156 | |
2fa291ac YQ |
7157 | /* Helper thread of agent. */ |
7158 | ||
0fb4aa4b | 7159 | static void * |
2fa291ac | 7160 | gdb_agent_helper_thread (void *arg) |
0fb4aa4b PA |
7161 | { |
7162 | int listen_fd; | |
7163 | ||
7255706c YQ |
7164 | atexit (gdb_agent_remove_socket); |
7165 | ||
0fb4aa4b PA |
7166 | while (1) |
7167 | { | |
2fa291ac | 7168 | listen_fd = gdb_agent_socket_init (); |
0fb4aa4b | 7169 | |
0fb4aa4b PA |
7170 | if (helper_thread_id == 0) |
7171 | helper_thread_id = syscall (SYS_gettid); | |
0fb4aa4b PA |
7172 | |
7173 | if (listen_fd == -1) | |
7174 | { | |
7175 | warning ("could not create sync socket\n"); | |
7176 | break; | |
7177 | } | |
7178 | ||
7179 | while (1) | |
7180 | { | |
7181 | socklen_t tmp; | |
7182 | struct sockaddr_un sockaddr; | |
7183 | int fd; | |
7184 | char buf[1]; | |
7185 | int ret; | |
7255706c | 7186 | int stop_loop = 0; |
0fb4aa4b PA |
7187 | |
7188 | tmp = sizeof (sockaddr); | |
7189 | ||
7190 | do | |
7191 | { | |
7192 | fd = accept (listen_fd, &sockaddr, &tmp); | |
7193 | } | |
7194 | /* It seems an ERESTARTSYS can escape out of accept. */ | |
7195 | while (fd == -512 || (fd == -1 && errno == EINTR)); | |
7196 | ||
7197 | if (fd < 0) | |
7198 | { | |
7199 | warning ("Accept returned %d, error: %s\n", | |
7200 | fd, strerror (errno)); | |
7201 | break; | |
7202 | } | |
7203 | ||
7204 | do | |
7205 | { | |
7206 | ret = read (fd, buf, 1); | |
7207 | } while (ret == -1 && errno == EINTR); | |
7208 | ||
7209 | if (ret == -1) | |
7210 | { | |
7211 | warning ("reading socket (fd=%d) failed with %s", | |
7212 | fd, strerror (errno)); | |
7213 | close (fd); | |
7214 | break; | |
7215 | } | |
7216 | ||
7217 | if (cmd_buf[0]) | |
7218 | { | |
7255706c YQ |
7219 | if (strncmp ("close", cmd_buf, 5) == 0) |
7220 | { | |
7221 | stop_loop = 1; | |
7222 | } | |
2fa291ac | 7223 | #ifdef HAVE_UST |
7255706c | 7224 | else if (strcmp ("qTfSTM", cmd_buf) == 0) |
0fb4aa4b PA |
7225 | { |
7226 | cmd_qtfstm (cmd_buf); | |
7227 | } | |
7228 | else if (strcmp ("qTsSTM", cmd_buf) == 0) | |
7229 | { | |
7230 | cmd_qtsstm (cmd_buf); | |
7231 | } | |
7232 | else if (strncmp ("unprobe_marker_at:", | |
7233 | cmd_buf, | |
7234 | sizeof ("unprobe_marker_at:") - 1) == 0) | |
7235 | { | |
7236 | unprobe_marker_at (cmd_buf); | |
7237 | } | |
7238 | else if (strncmp ("probe_marker_at:", | |
7239 | cmd_buf, | |
7240 | sizeof ("probe_marker_at:") - 1) == 0) | |
7241 | { | |
7242 | probe_marker_at (cmd_buf); | |
7243 | } | |
7244 | else if (strncmp ("qTSTMat:", | |
7245 | cmd_buf, | |
7246 | sizeof ("qTSTMat:") - 1) == 0) | |
7247 | { | |
7248 | cmd_qtstmat (cmd_buf); | |
7249 | } | |
2fa291ac | 7250 | #endif /* HAVE_UST */ |
0fb4aa4b PA |
7251 | } |
7252 | ||
712c6575 YQ |
7253 | /* Fix compiler's warning: ignoring return value of 'write'. */ |
7254 | ret = write (fd, buf, 1); | |
0fb4aa4b | 7255 | close (fd); |
7255706c YQ |
7256 | |
7257 | if (stop_loop) | |
7258 | { | |
7259 | close (listen_fd); | |
7260 | unlink (agent_socket_name); | |
7261 | ||
7262 | /* Sleep endlessly to wait the whole inferior stops. This | |
7263 | thread can not exit because GDB or GDBserver may still need | |
0bfdf32f | 7264 | 'current_thread' (representing this thread) to access |
7255706c | 7265 | inferior memory. Otherwise, this thread exits earlier than |
0bfdf32f | 7266 | other threads, and 'current_thread' is set to NULL. */ |
7255706c YQ |
7267 | while (1) |
7268 | sleep (10); | |
7269 | } | |
0fb4aa4b PA |
7270 | } |
7271 | } | |
7272 | ||
7273 | return NULL; | |
7274 | } | |
7275 | ||
7276 | #include <signal.h> | |
2fa291ac | 7277 | #include <pthread.h> |
0fb4aa4b | 7278 | |
8ffcbaaf YQ |
7279 | IP_AGENT_EXPORT int gdb_agent_capability = AGENT_CAPA_STATIC_TRACE; |
7280 | ||
0fb4aa4b | 7281 | static void |
2fa291ac | 7282 | gdb_agent_init (void) |
0fb4aa4b PA |
7283 | { |
7284 | int res; | |
7285 | pthread_t thread; | |
7286 | sigset_t new_mask; | |
7287 | sigset_t orig_mask; | |
7288 | ||
0fb4aa4b PA |
7289 | /* We want the helper thread to be as transparent as possible, so |
7290 | have it inherit an all-signals-blocked mask. */ | |
7291 | ||
7292 | sigfillset (&new_mask); | |
7293 | res = pthread_sigmask (SIG_SETMASK, &new_mask, &orig_mask); | |
7294 | if (res) | |
14ce3192 | 7295 | perror_with_name ("pthread_sigmask (1)"); |
0fb4aa4b PA |
7296 | |
7297 | res = pthread_create (&thread, | |
7298 | NULL, | |
2fa291ac | 7299 | gdb_agent_helper_thread, |
0fb4aa4b PA |
7300 | NULL); |
7301 | ||
7302 | res = pthread_sigmask (SIG_SETMASK, &orig_mask, NULL); | |
7303 | if (res) | |
14ce3192 | 7304 | perror_with_name ("pthread_sigmask (2)"); |
0fb4aa4b PA |
7305 | |
7306 | while (helper_thread_id == 0) | |
7307 | usleep (1); | |
7308 | ||
2fa291ac YQ |
7309 | #ifdef HAVE_UST |
7310 | gdb_ust_init (); | |
7311 | #endif | |
0fb4aa4b PA |
7312 | } |
7313 | ||
0fb4aa4b PA |
7314 | #include <sys/mman.h> |
7315 | #include <fcntl.h> | |
7316 | ||
7317 | IP_AGENT_EXPORT char *gdb_tp_heap_buffer; | |
7318 | IP_AGENT_EXPORT char *gdb_jump_pad_buffer; | |
7319 | IP_AGENT_EXPORT char *gdb_jump_pad_buffer_end; | |
405f8e94 SS |
7320 | IP_AGENT_EXPORT char *gdb_trampoline_buffer; |
7321 | IP_AGENT_EXPORT char *gdb_trampoline_buffer_end; | |
7322 | IP_AGENT_EXPORT char *gdb_trampoline_buffer_error; | |
7323 | ||
7324 | /* Record the result of getting buffer space for fast tracepoint | |
7325 | trampolines. Any error message is copied, since caller may not be | |
7326 | using persistent storage. */ | |
7327 | ||
7328 | void | |
7329 | set_trampoline_buffer_space (CORE_ADDR begin, CORE_ADDR end, char *errmsg) | |
7330 | { | |
7331 | gdb_trampoline_buffer = (char *) (uintptr_t) begin; | |
7332 | gdb_trampoline_buffer_end = (char *) (uintptr_t) end; | |
7333 | if (errmsg) | |
7334 | strncpy (gdb_trampoline_buffer_error, errmsg, 99); | |
7335 | else | |
7336 | strcpy (gdb_trampoline_buffer_error, "no buffer passed"); | |
7337 | } | |
0fb4aa4b PA |
7338 | |
7339 | static void __attribute__ ((constructor)) | |
7340 | initialize_tracepoint_ftlib (void) | |
7341 | { | |
7342 | initialize_tracepoint (); | |
7343 | ||
2fa291ac | 7344 | gdb_agent_init (); |
0fb4aa4b PA |
7345 | } |
7346 | ||
7347 | #endif /* IN_PROCESS_AGENT */ | |
fa593d66 | 7348 | |
f196051f SS |
7349 | /* Return a timestamp, expressed as microseconds of the usual Unix |
7350 | time. (As the result is a 64-bit number, it will not overflow any | |
7351 | time soon.) */ | |
7352 | ||
219f2f23 | 7353 | static LONGEST |
f196051f | 7354 | get_timestamp (void) |
219f2f23 PA |
7355 | { |
7356 | struct timeval tv; | |
7357 | ||
7358 | if (gettimeofday (&tv, 0) != 0) | |
7359 | return -1; | |
7360 | else | |
7361 | return (LONGEST) tv.tv_sec * 1000000 + tv.tv_usec; | |
7362 | } | |
7363 | ||
7364 | void | |
7365 | initialize_tracepoint (void) | |
7366 | { | |
f6f899bf HAQ |
7367 | /* Start with the default size. */ |
7368 | init_trace_buffer (DEFAULT_TRACE_BUFFER_SIZE); | |
219f2f23 PA |
7369 | |
7370 | /* Wire trace state variable 1 to be the timestamp. This will be | |
7371 | uploaded to GDB upon connection and become one of its trace state | |
7372 | variables. (In case you're wondering, if GDB already has a trace | |
7373 | variable numbered 1, it will be renumbered.) */ | |
fa593d66 | 7374 | create_trace_state_variable (1, 0); |
219f2f23 | 7375 | set_trace_state_variable_name (1, "trace_timestamp"); |
f196051f | 7376 | set_trace_state_variable_getter (1, get_timestamp); |
fa593d66 PA |
7377 | |
7378 | #ifdef IN_PROCESS_AGENT | |
7379 | { | |
fc1ab1a0 | 7380 | uintptr_t addr; |
fa593d66 | 7381 | int pagesize; |
fc1ab1a0 | 7382 | |
fa593d66 PA |
7383 | pagesize = sysconf (_SC_PAGE_SIZE); |
7384 | if (pagesize == -1) | |
14ce3192 | 7385 | perror_with_name ("sysconf"); |
fa593d66 PA |
7386 | |
7387 | gdb_tp_heap_buffer = xmalloc (5 * 1024 * 1024); | |
7388 | ||
fc1ab1a0 PA |
7389 | #define SCRATCH_BUFFER_NPAGES 20 |
7390 | ||
7391 | /* Allocate scratch buffer aligned on a page boundary, at a low | |
7392 | address (close to the main executable's code). */ | |
7393 | for (addr = pagesize; addr != 0; addr += pagesize) | |
7394 | { | |
7395 | gdb_jump_pad_buffer = mmap ((void *) addr, pagesize * SCRATCH_BUFFER_NPAGES, | |
7396 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
7397 | MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, | |
7398 | -1, 0); | |
7399 | if (gdb_jump_pad_buffer != MAP_FAILED) | |
7400 | break; | |
7401 | } | |
fa593d66 | 7402 | |
fc1ab1a0 | 7403 | if (addr == 0) |
14ce3192 | 7404 | perror_with_name ("mmap"); |
fc1ab1a0 PA |
7405 | |
7406 | gdb_jump_pad_buffer_end = gdb_jump_pad_buffer + pagesize * SCRATCH_BUFFER_NPAGES; | |
fa593d66 PA |
7407 | } |
7408 | ||
405f8e94 SS |
7409 | gdb_trampoline_buffer = gdb_trampoline_buffer_end = 0; |
7410 | ||
7411 | /* It's not a fatal error for something to go wrong with trampoline | |
7412 | buffer setup, but it can be mysterious, so create a channel to | |
7413 | report back on what went wrong, using a fixed size since we may | |
7414 | not be able to allocate space later when the problem occurs. */ | |
7415 | gdb_trampoline_buffer_error = xmalloc (IPA_BUFSIZ); | |
7416 | ||
7417 | strcpy (gdb_trampoline_buffer_error, "No errors reported"); | |
7418 | ||
fa593d66 PA |
7419 | initialize_low_tracepoint (); |
7420 | #endif | |
219f2f23 | 7421 | } |