Commit | Line | Data |
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219f2f23 | 1 | /* Tracepoint code for remote server for GDB. |
61baf725 | 2 | Copyright (C) 2009-2017 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> | |
dcb07cfa | 28 | #include <chrono> |
5f18041e | 29 | #include <inttypes.h> |
5e1dc496 | 30 | #include "ax.h" |
3aee8918 | 31 | #include "tdesc.h" |
219f2f23 | 32 | |
f6f899bf HAQ |
33 | #define DEFAULT_TRACE_BUFFER_SIZE 5242880 /* 5*1024*1024 */ |
34 | ||
61adf464 | 35 | /* This file is built for both GDBserver, and the in-process |
fa593d66 PA |
36 | agent (IPA), a shared library that includes a tracing agent that is |
37 | loaded by the inferior to support fast tracepoints. Fast | |
38 | tracepoints (or more accurately, jump based tracepoints) are | |
39 | implemented by patching the tracepoint location with a jump into a | |
40 | small trampoline function whose job is to save the register state, | |
41 | call the in-process tracing agent, and then execute the original | |
42 | instruction that was under the tracepoint jump (possibly adjusted, | |
43 | if PC-relative, or some such). | |
44 | ||
45 | The current synchronization design is pull based. That means, | |
46 | GDBserver does most of the work, by peeking/poking at the inferior | |
47 | agent's memory directly for downloading tracepoint and associated | |
48 | objects, and for uploading trace frames. Whenever the IPA needs | |
49 | something from GDBserver (trace buffer is full, tracing stopped for | |
50 | some reason, etc.) the IPA calls a corresponding hook function | |
51 | where GDBserver has placed a breakpoint. | |
52 | ||
53 | Each of the agents has its own trace buffer. When browsing the | |
54 | trace frames built from slow and fast tracepoints from GDB (tfind | |
55 | mode), there's no guarantee the user is seeing the trace frames in | |
56 | strict chronological creation order, although, GDBserver tries to | |
57 | keep the order relatively reasonable, by syncing the trace buffers | |
58 | at appropriate times. | |
59 | ||
60 | */ | |
61 | ||
87ce2a04 DE |
62 | #ifdef IN_PROCESS_AGENT |
63 | ||
18c1b81a | 64 | static void trace_vdebug (const char *, ...) ATTRIBUTE_PRINTF (1, 2); |
219f2f23 PA |
65 | |
66 | static void | |
fa593d66 | 67 | trace_vdebug (const char *fmt, ...) |
219f2f23 PA |
68 | { |
69 | char buf[1024]; | |
70 | va_list ap; | |
71 | ||
72 | va_start (ap, fmt); | |
73 | vsprintf (buf, fmt, ap); | |
5e1dc496 | 74 | fprintf (stderr, PROG "/tracepoint: %s\n", buf); |
219f2f23 PA |
75 | va_end (ap); |
76 | } | |
77 | ||
fa593d66 | 78 | #define trace_debug_1(level, fmt, args...) \ |
219f2f23 | 79 | do { \ |
32d92999 | 80 | if (level <= debug_threads) \ |
fa593d66 | 81 | trace_vdebug ((fmt), ##args); \ |
219f2f23 PA |
82 | } while (0) |
83 | ||
87ce2a04 DE |
84 | #else |
85 | ||
86 | #define trace_debug_1(level, fmt, args...) \ | |
87 | do { \ | |
88 | if (level <= debug_threads) \ | |
89 | { \ | |
90 | debug_printf ((fmt), ##args); \ | |
91 | debug_printf ("\n"); \ | |
92 | } \ | |
93 | } while (0) | |
94 | ||
95 | #endif | |
96 | ||
fa593d66 PA |
97 | #define trace_debug(FMT, args...) \ |
98 | trace_debug_1 (1, FMT, ##args) | |
99 | ||
fa593d66 | 100 | /* Prefix exported symbols, for good citizenship. All the symbols |
3c14e5a3 PA |
101 | that need exporting are defined in this module. Note that all |
102 | these symbols must be tagged with IP_AGENT_EXPORT_*. */ | |
fa593d66 | 103 | #ifdef IN_PROCESS_AGENT |
3c14e5a3 PA |
104 | # define gdb_tp_heap_buffer IPA_SYM_EXPORTED_NAME (gdb_tp_heap_buffer) |
105 | # define gdb_jump_pad_buffer IPA_SYM_EXPORTED_NAME (gdb_jump_pad_buffer) | |
106 | # define gdb_jump_pad_buffer_end IPA_SYM_EXPORTED_NAME (gdb_jump_pad_buffer_end) | |
107 | # define gdb_trampoline_buffer IPA_SYM_EXPORTED_NAME (gdb_trampoline_buffer) | |
108 | # define gdb_trampoline_buffer_end IPA_SYM_EXPORTED_NAME (gdb_trampoline_buffer_end) | |
109 | # define gdb_trampoline_buffer_error IPA_SYM_EXPORTED_NAME (gdb_trampoline_buffer_error) | |
110 | # define collecting IPA_SYM_EXPORTED_NAME (collecting) | |
1cda1512 | 111 | # define gdb_collect_ptr IPA_SYM_EXPORTED_NAME (gdb_collect_ptr) |
3c14e5a3 PA |
112 | # define stop_tracing IPA_SYM_EXPORTED_NAME (stop_tracing) |
113 | # define flush_trace_buffer IPA_SYM_EXPORTED_NAME (flush_trace_buffer) | |
114 | # define about_to_request_buffer_space IPA_SYM_EXPORTED_NAME (about_to_request_buffer_space) | |
115 | # define trace_buffer_is_full IPA_SYM_EXPORTED_NAME (trace_buffer_is_full) | |
116 | # define stopping_tracepoint IPA_SYM_EXPORTED_NAME (stopping_tracepoint) | |
117 | # define expr_eval_result IPA_SYM_EXPORTED_NAME (expr_eval_result) | |
118 | # define error_tracepoint IPA_SYM_EXPORTED_NAME (error_tracepoint) | |
119 | # define tracepoints IPA_SYM_EXPORTED_NAME (tracepoints) | |
120 | # define tracing IPA_SYM_EXPORTED_NAME (tracing) | |
121 | # define trace_buffer_ctrl IPA_SYM_EXPORTED_NAME (trace_buffer_ctrl) | |
122 | # define trace_buffer_ctrl_curr IPA_SYM_EXPORTED_NAME (trace_buffer_ctrl_curr) | |
123 | # define trace_buffer_lo IPA_SYM_EXPORTED_NAME (trace_buffer_lo) | |
124 | # define trace_buffer_hi IPA_SYM_EXPORTED_NAME (trace_buffer_hi) | |
125 | # define traceframe_read_count IPA_SYM_EXPORTED_NAME (traceframe_read_count) | |
126 | # define traceframe_write_count IPA_SYM_EXPORTED_NAME (traceframe_write_count) | |
127 | # define traceframes_created IPA_SYM_EXPORTED_NAME (traceframes_created) | |
128 | # define trace_state_variables IPA_SYM_EXPORTED_NAME (trace_state_variables) | |
1cda1512 MK |
129 | # define get_raw_reg_ptr IPA_SYM_EXPORTED_NAME (get_raw_reg_ptr) |
130 | # define get_trace_state_variable_value_ptr \ | |
131 | IPA_SYM_EXPORTED_NAME (get_trace_state_variable_value_ptr) | |
132 | # define set_trace_state_variable_value_ptr \ | |
133 | IPA_SYM_EXPORTED_NAME (set_trace_state_variable_value_ptr) | |
3c14e5a3 PA |
134 | # define ust_loaded IPA_SYM_EXPORTED_NAME (ust_loaded) |
135 | # define helper_thread_id IPA_SYM_EXPORTED_NAME (helper_thread_id) | |
136 | # define cmd_buf IPA_SYM_EXPORTED_NAME (cmd_buf) | |
ae91f625 | 137 | # define ipa_tdesc_idx IPA_SYM_EXPORTED_NAME (ipa_tdesc_idx) |
fa593d66 PA |
138 | #endif |
139 | ||
140 | #ifndef IN_PROCESS_AGENT | |
141 | ||
142 | /* Addresses of in-process agent's symbols GDBserver cares about. */ | |
143 | ||
144 | struct ipa_sym_addresses | |
145 | { | |
146 | CORE_ADDR addr_gdb_tp_heap_buffer; | |
147 | CORE_ADDR addr_gdb_jump_pad_buffer; | |
148 | CORE_ADDR addr_gdb_jump_pad_buffer_end; | |
405f8e94 SS |
149 | CORE_ADDR addr_gdb_trampoline_buffer; |
150 | CORE_ADDR addr_gdb_trampoline_buffer_end; | |
151 | CORE_ADDR addr_gdb_trampoline_buffer_error; | |
fa593d66 | 152 | CORE_ADDR addr_collecting; |
1cda1512 | 153 | CORE_ADDR addr_gdb_collect_ptr; |
fa593d66 PA |
154 | CORE_ADDR addr_stop_tracing; |
155 | CORE_ADDR addr_flush_trace_buffer; | |
156 | CORE_ADDR addr_about_to_request_buffer_space; | |
157 | CORE_ADDR addr_trace_buffer_is_full; | |
158 | CORE_ADDR addr_stopping_tracepoint; | |
159 | CORE_ADDR addr_expr_eval_result; | |
160 | CORE_ADDR addr_error_tracepoint; | |
161 | CORE_ADDR addr_tracepoints; | |
162 | CORE_ADDR addr_tracing; | |
163 | CORE_ADDR addr_trace_buffer_ctrl; | |
164 | CORE_ADDR addr_trace_buffer_ctrl_curr; | |
165 | CORE_ADDR addr_trace_buffer_lo; | |
166 | CORE_ADDR addr_trace_buffer_hi; | |
167 | CORE_ADDR addr_traceframe_read_count; | |
168 | CORE_ADDR addr_traceframe_write_count; | |
169 | CORE_ADDR addr_traceframes_created; | |
170 | CORE_ADDR addr_trace_state_variables; | |
1cda1512 MK |
171 | CORE_ADDR addr_get_raw_reg_ptr; |
172 | CORE_ADDR addr_get_trace_state_variable_value_ptr; | |
173 | CORE_ADDR addr_set_trace_state_variable_value_ptr; | |
0fb4aa4b | 174 | CORE_ADDR addr_ust_loaded; |
ae91f625 | 175 | CORE_ADDR addr_ipa_tdesc_idx; |
fa593d66 PA |
176 | }; |
177 | ||
fa593d66 PA |
178 | static struct |
179 | { | |
180 | const char *name; | |
181 | int offset; | |
fa593d66 PA |
182 | } symbol_list[] = { |
183 | IPA_SYM(gdb_tp_heap_buffer), | |
184 | IPA_SYM(gdb_jump_pad_buffer), | |
185 | IPA_SYM(gdb_jump_pad_buffer_end), | |
405f8e94 SS |
186 | IPA_SYM(gdb_trampoline_buffer), |
187 | IPA_SYM(gdb_trampoline_buffer_end), | |
188 | IPA_SYM(gdb_trampoline_buffer_error), | |
fa593d66 | 189 | IPA_SYM(collecting), |
1cda1512 | 190 | IPA_SYM(gdb_collect_ptr), |
fa593d66 PA |
191 | IPA_SYM(stop_tracing), |
192 | IPA_SYM(flush_trace_buffer), | |
193 | IPA_SYM(about_to_request_buffer_space), | |
194 | IPA_SYM(trace_buffer_is_full), | |
195 | IPA_SYM(stopping_tracepoint), | |
196 | IPA_SYM(expr_eval_result), | |
197 | IPA_SYM(error_tracepoint), | |
198 | IPA_SYM(tracepoints), | |
199 | IPA_SYM(tracing), | |
200 | IPA_SYM(trace_buffer_ctrl), | |
201 | IPA_SYM(trace_buffer_ctrl_curr), | |
202 | IPA_SYM(trace_buffer_lo), | |
203 | IPA_SYM(trace_buffer_hi), | |
204 | IPA_SYM(traceframe_read_count), | |
205 | IPA_SYM(traceframe_write_count), | |
206 | IPA_SYM(traceframes_created), | |
207 | IPA_SYM(trace_state_variables), | |
1cda1512 MK |
208 | IPA_SYM(get_raw_reg_ptr), |
209 | IPA_SYM(get_trace_state_variable_value_ptr), | |
210 | IPA_SYM(set_trace_state_variable_value_ptr), | |
0fb4aa4b | 211 | IPA_SYM(ust_loaded), |
ae91f625 | 212 | IPA_SYM(ipa_tdesc_idx), |
fa593d66 PA |
213 | }; |
214 | ||
2fa291ac | 215 | static struct ipa_sym_addresses ipa_sym_addrs; |
fa593d66 | 216 | |
fa593d66 PA |
217 | static int read_inferior_integer (CORE_ADDR symaddr, int *val); |
218 | ||
0fb4aa4b | 219 | /* Returns true if both the in-process agent library and the static |
8ffcbaaf YQ |
220 | tracepoints libraries are loaded in the inferior, and agent has |
221 | capability on static tracepoints. */ | |
0fb4aa4b PA |
222 | |
223 | static int | |
8ffcbaaf | 224 | in_process_agent_supports_ust (void) |
0fb4aa4b PA |
225 | { |
226 | int loaded = 0; | |
227 | ||
58b4daa5 | 228 | if (!agent_loaded_p ()) |
0fb4aa4b PA |
229 | { |
230 | warning ("In-process agent not loaded"); | |
231 | return 0; | |
232 | } | |
233 | ||
8ffcbaaf | 234 | if (agent_capability_check (AGENT_CAPA_STATIC_TRACE)) |
0fb4aa4b | 235 | { |
8ffcbaaf YQ |
236 | /* Agent understands static tracepoint, then check whether UST is in |
237 | fact loaded in the inferior. */ | |
238 | if (read_inferior_integer (ipa_sym_addrs.addr_ust_loaded, &loaded)) | |
239 | { | |
240 | warning ("Error reading ust_loaded in lib"); | |
241 | return 0; | |
242 | } | |
0fb4aa4b | 243 | |
8ffcbaaf YQ |
244 | return loaded; |
245 | } | |
246 | else | |
247 | return 0; | |
0fb4aa4b PA |
248 | } |
249 | ||
fa593d66 PA |
250 | static void |
251 | write_e_ipa_not_loaded (char *buffer) | |
252 | { | |
253 | sprintf (buffer, | |
254 | "E.In-process agent library not loaded in process. " | |
0fb4aa4b PA |
255 | "Fast and static tracepoints unavailable."); |
256 | } | |
257 | ||
258 | /* Write an error to BUFFER indicating that UST isn't loaded in the | |
259 | inferior. */ | |
260 | ||
261 | static void | |
262 | write_e_ust_not_loaded (char *buffer) | |
263 | { | |
264 | #ifdef HAVE_UST | |
265 | sprintf (buffer, | |
266 | "E.UST library not loaded in process. " | |
267 | "Static tracepoints unavailable."); | |
268 | #else | |
269 | sprintf (buffer, "E.GDBserver was built without static tracepoints support"); | |
270 | #endif | |
fa593d66 PA |
271 | } |
272 | ||
0fb4aa4b PA |
273 | /* If the in-process agent library isn't loaded in the inferior, write |
274 | an error to BUFFER, and return 1. Otherwise, return 0. */ | |
275 | ||
fa593d66 PA |
276 | static int |
277 | maybe_write_ipa_not_loaded (char *buffer) | |
278 | { | |
58b4daa5 | 279 | if (!agent_loaded_p ()) |
fa593d66 PA |
280 | { |
281 | write_e_ipa_not_loaded (buffer); | |
282 | return 1; | |
283 | } | |
284 | return 0; | |
285 | } | |
286 | ||
0fb4aa4b PA |
287 | /* If the in-process agent library and the ust (static tracepoints) |
288 | library aren't loaded in the inferior, write an error to BUFFER, | |
289 | and return 1. Otherwise, return 0. */ | |
290 | ||
291 | static int | |
292 | maybe_write_ipa_ust_not_loaded (char *buffer) | |
293 | { | |
58b4daa5 | 294 | if (!agent_loaded_p ()) |
0fb4aa4b PA |
295 | { |
296 | write_e_ipa_not_loaded (buffer); | |
297 | return 1; | |
298 | } | |
8ffcbaaf | 299 | else if (!in_process_agent_supports_ust ()) |
0fb4aa4b PA |
300 | { |
301 | write_e_ust_not_loaded (buffer); | |
302 | return 1; | |
303 | } | |
304 | return 0; | |
305 | } | |
306 | ||
fa593d66 PA |
307 | /* Cache all future symbols that the tracepoints module might request. |
308 | We can not request symbols at arbitrary states in the remote | |
309 | protocol, only when the client tells us that new symbols are | |
310 | available. So when we load the in-process library, make sure to | |
311 | check the entire list. */ | |
312 | ||
313 | void | |
314 | tracepoint_look_up_symbols (void) | |
315 | { | |
fa593d66 PA |
316 | int i; |
317 | ||
58b4daa5 | 318 | if (agent_loaded_p ()) |
fa593d66 PA |
319 | return; |
320 | ||
fa593d66 PA |
321 | for (i = 0; i < sizeof (symbol_list) / sizeof (symbol_list[0]); i++) |
322 | { | |
323 | CORE_ADDR *addrp = | |
324 | (CORE_ADDR *) ((char *) &ipa_sym_addrs + symbol_list[i].offset); | |
325 | ||
326 | if (look_up_one_symbol (symbol_list[i].name, addrp, 1) == 0) | |
327 | { | |
328 | if (debug_threads) | |
87ce2a04 | 329 | debug_printf ("symbol `%s' not found\n", symbol_list[i].name); |
2275a1a7 | 330 | return; |
fa593d66 PA |
331 | } |
332 | } | |
333 | ||
5808517f | 334 | agent_look_up_symbols (NULL); |
fa593d66 PA |
335 | } |
336 | ||
337 | #endif | |
338 | ||
339 | /* GDBserver places a breakpoint on the IPA's version (which is a nop) | |
340 | of the "stop_tracing" function. When this breakpoint is hit, | |
341 | tracing stopped in the IPA for some reason. E.g., due to | |
342 | tracepoint reaching the pass count, hitting conditional expression | |
343 | evaluation error, etc. | |
344 | ||
345 | The IPA's trace buffer is never in circular tracing mode: instead, | |
346 | GDBserver's is, and whenever the in-process buffer fills, it calls | |
347 | "flush_trace_buffer", which triggers an internal breakpoint. | |
348 | GDBserver reacts to this breakpoint by pulling the meanwhile | |
349 | collected data. Old frames discarding is always handled on the | |
350 | GDBserver side. */ | |
351 | ||
352 | #ifdef IN_PROCESS_AGENT | |
fa593d66 PA |
353 | int |
354 | read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) | |
355 | { | |
356 | memcpy (myaddr, (void *) (uintptr_t) memaddr, len); | |
357 | return 0; | |
358 | } | |
359 | ||
360 | /* Call this in the functions where GDBserver places a breakpoint, so | |
361 | that the compiler doesn't try to be clever and skip calling the | |
362 | function at all. This is necessary, even if we tell the compiler | |
363 | to not inline said functions. */ | |
364 | ||
365 | #if defined(__GNUC__) | |
366 | # define UNKNOWN_SIDE_EFFECTS() asm ("") | |
367 | #else | |
368 | # define UNKNOWN_SIDE_EFFECTS() do {} while (0) | |
369 | #endif | |
370 | ||
3c14e5a3 | 371 | IP_AGENT_EXPORT_FUNC void |
fa593d66 PA |
372 | stop_tracing (void) |
373 | { | |
374 | /* GDBserver places breakpoint here. */ | |
375 | UNKNOWN_SIDE_EFFECTS(); | |
376 | } | |
377 | ||
3c14e5a3 | 378 | IP_AGENT_EXPORT_FUNC void |
fa593d66 PA |
379 | flush_trace_buffer (void) |
380 | { | |
381 | /* GDBserver places breakpoint here. */ | |
382 | UNKNOWN_SIDE_EFFECTS(); | |
383 | } | |
384 | ||
385 | #endif | |
386 | ||
387 | #ifndef IN_PROCESS_AGENT | |
219f2f23 PA |
388 | static int |
389 | tracepoint_handler (CORE_ADDR address) | |
390 | { | |
391 | trace_debug ("tracepoint_handler: tracepoint at 0x%s hit", | |
392 | paddress (address)); | |
393 | return 0; | |
394 | } | |
395 | ||
fa593d66 PA |
396 | /* Breakpoint at "stop_tracing" in the inferior lib. */ |
397 | struct breakpoint *stop_tracing_bkpt; | |
398 | static int stop_tracing_handler (CORE_ADDR); | |
399 | ||
400 | /* Breakpoint at "flush_trace_buffer" in the inferior lib. */ | |
401 | struct breakpoint *flush_trace_buffer_bkpt; | |
402 | static int flush_trace_buffer_handler (CORE_ADDR); | |
403 | ||
fa593d66 PA |
404 | static void download_trace_state_variables (void); |
405 | static void upload_fast_traceframes (void); | |
406 | ||
42476b70 | 407 | static int run_inferior_command (char *cmd, int len); |
0fb4aa4b | 408 | |
fa593d66 PA |
409 | static int |
410 | read_inferior_integer (CORE_ADDR symaddr, int *val) | |
411 | { | |
412 | return read_inferior_memory (symaddr, (unsigned char *) val, | |
413 | sizeof (*val)); | |
414 | } | |
415 | ||
42476b70 YQ |
416 | struct tracepoint; |
417 | static int tracepoint_send_agent (struct tracepoint *tpoint); | |
418 | ||
fa593d66 PA |
419 | static int |
420 | read_inferior_uinteger (CORE_ADDR symaddr, unsigned int *val) | |
421 | { | |
422 | return read_inferior_memory (symaddr, (unsigned char *) val, | |
423 | sizeof (*val)); | |
424 | } | |
425 | ||
426 | static int | |
427 | read_inferior_data_pointer (CORE_ADDR symaddr, CORE_ADDR *val) | |
428 | { | |
429 | void *pval = (void *) (uintptr_t) val; | |
430 | int ret; | |
431 | ||
432 | ret = read_inferior_memory (symaddr, (unsigned char *) &pval, sizeof (pval)); | |
433 | *val = (uintptr_t) pval; | |
434 | return ret; | |
435 | } | |
436 | ||
437 | static int | |
438 | write_inferior_data_pointer (CORE_ADDR symaddr, CORE_ADDR val) | |
439 | { | |
440 | void *pval = (void *) (uintptr_t) val; | |
441 | return write_inferior_memory (symaddr, | |
442 | (unsigned char *) &pval, sizeof (pval)); | |
443 | } | |
444 | ||
445 | static int | |
446 | write_inferior_integer (CORE_ADDR symaddr, int val) | |
447 | { | |
448 | return write_inferior_memory (symaddr, (unsigned char *) &val, sizeof (val)); | |
449 | } | |
450 | ||
35fd2deb PO |
451 | static int |
452 | write_inferior_int8 (CORE_ADDR symaddr, int8_t val) | |
453 | { | |
454 | return write_inferior_memory (symaddr, (unsigned char *) &val, sizeof (val)); | |
455 | } | |
456 | ||
fa593d66 PA |
457 | static int |
458 | write_inferior_uinteger (CORE_ADDR symaddr, unsigned int val) | |
459 | { | |
460 | return write_inferior_memory (symaddr, (unsigned char *) &val, sizeof (val)); | |
461 | } | |
462 | ||
8d0d92cd | 463 | static CORE_ADDR target_malloc (ULONGEST size); |
42476b70 YQ |
464 | |
465 | #define COPY_FIELD_TO_BUF(BUF, OBJ, FIELD) \ | |
466 | do { \ | |
467 | memcpy (BUF, &(OBJ)->FIELD, sizeof ((OBJ)->FIELD)); \ | |
468 | BUF += sizeof ((OBJ)->FIELD); \ | |
469 | } while (0) | |
470 | ||
fa593d66 PA |
471 | #endif |
472 | ||
219f2f23 PA |
473 | /* Base action. Concrete actions inherit this. */ |
474 | ||
475 | struct tracepoint_action | |
476 | { | |
477 | char type; | |
478 | }; | |
479 | ||
480 | /* An 'M' (collect memory) action. */ | |
481 | struct collect_memory_action | |
482 | { | |
483 | struct tracepoint_action base; | |
484 | ||
485 | ULONGEST addr; | |
486 | ULONGEST len; | |
5f18041e | 487 | int32_t basereg; |
219f2f23 PA |
488 | }; |
489 | ||
490 | /* An 'R' (collect registers) action. */ | |
491 | ||
492 | struct collect_registers_action | |
493 | { | |
494 | struct tracepoint_action base; | |
495 | }; | |
496 | ||
497 | /* An 'X' (evaluate expression) action. */ | |
498 | ||
499 | struct eval_expr_action | |
500 | { | |
501 | struct tracepoint_action base; | |
502 | ||
503 | struct agent_expr *expr; | |
504 | }; | |
505 | ||
0fb4aa4b PA |
506 | /* An 'L' (collect static trace data) action. */ |
507 | struct collect_static_trace_data_action | |
508 | { | |
509 | struct tracepoint_action base; | |
510 | }; | |
511 | ||
8d0d92cd YQ |
512 | #ifndef IN_PROCESS_AGENT |
513 | static CORE_ADDR | |
514 | m_tracepoint_action_download (const struct tracepoint_action *action) | |
515 | { | |
7cae9051 | 516 | CORE_ADDR ipa_action = target_malloc (sizeof (struct collect_memory_action)); |
8d0d92cd | 517 | |
7cae9051 WW |
518 | write_inferior_memory (ipa_action, (unsigned char *) action, |
519 | sizeof (struct collect_memory_action)); | |
8d0d92cd YQ |
520 | |
521 | return ipa_action; | |
522 | } | |
42476b70 YQ |
523 | static char * |
524 | m_tracepoint_action_send (char *buffer, const struct tracepoint_action *action) | |
525 | { | |
526 | struct collect_memory_action *maction | |
527 | = (struct collect_memory_action *) action; | |
528 | ||
529 | COPY_FIELD_TO_BUF (buffer, maction, addr); | |
530 | COPY_FIELD_TO_BUF (buffer, maction, len); | |
531 | COPY_FIELD_TO_BUF (buffer, maction, basereg); | |
532 | ||
533 | return buffer; | |
534 | } | |
8d0d92cd | 535 | |
8d0d92cd YQ |
536 | static CORE_ADDR |
537 | r_tracepoint_action_download (const struct tracepoint_action *action) | |
538 | { | |
7cae9051 | 539 | CORE_ADDR ipa_action = target_malloc (sizeof (struct collect_registers_action)); |
8d0d92cd | 540 | |
7cae9051 WW |
541 | write_inferior_memory (ipa_action, (unsigned char *) action, |
542 | sizeof (struct collect_registers_action)); | |
8d0d92cd YQ |
543 | |
544 | return ipa_action; | |
545 | } | |
546 | ||
42476b70 YQ |
547 | static char * |
548 | r_tracepoint_action_send (char *buffer, const struct tracepoint_action *action) | |
549 | { | |
550 | return buffer; | |
551 | } | |
552 | ||
8d0d92cd YQ |
553 | static CORE_ADDR download_agent_expr (struct agent_expr *expr); |
554 | ||
555 | static CORE_ADDR | |
556 | x_tracepoint_action_download (const struct tracepoint_action *action) | |
557 | { | |
7cae9051 | 558 | CORE_ADDR ipa_action = target_malloc (sizeof (struct eval_expr_action)); |
8d0d92cd YQ |
559 | CORE_ADDR expr; |
560 | ||
7cae9051 WW |
561 | write_inferior_memory (ipa_action, (unsigned char *) action, |
562 | sizeof (struct eval_expr_action)); | |
563 | expr = download_agent_expr (((struct eval_expr_action *) action)->expr); | |
020ecd38 MK |
564 | write_inferior_data_pointer (ipa_action |
565 | + offsetof (struct eval_expr_action, expr), | |
566 | expr); | |
8d0d92cd YQ |
567 | |
568 | return ipa_action; | |
569 | } | |
570 | ||
42476b70 YQ |
571 | /* Copy agent expression AEXPR to buffer pointed by P. If AEXPR is NULL, |
572 | copy 0 to P. Return updated header of buffer. */ | |
573 | ||
574 | static char * | |
575 | agent_expr_send (char *p, const struct agent_expr *aexpr) | |
576 | { | |
577 | /* Copy the length of condition first, and then copy its | |
578 | content. */ | |
579 | if (aexpr == NULL) | |
580 | { | |
581 | memset (p, 0, 4); | |
582 | p += 4; | |
583 | } | |
584 | else | |
585 | { | |
586 | memcpy (p, &aexpr->length, 4); | |
587 | p +=4; | |
588 | ||
589 | memcpy (p, aexpr->bytes, aexpr->length); | |
590 | p += aexpr->length; | |
591 | } | |
592 | return p; | |
593 | } | |
594 | ||
595 | static char * | |
596 | x_tracepoint_action_send ( char *buffer, const struct tracepoint_action *action) | |
597 | { | |
598 | struct eval_expr_action *eaction = (struct eval_expr_action *) action; | |
599 | ||
600 | return agent_expr_send (buffer, eaction->expr); | |
601 | } | |
602 | ||
8d0d92cd YQ |
603 | static CORE_ADDR |
604 | l_tracepoint_action_download (const struct tracepoint_action *action) | |
605 | { | |
7cae9051 WW |
606 | CORE_ADDR ipa_action |
607 | = target_malloc (sizeof (struct collect_static_trace_data_action)); | |
8d0d92cd | 608 | |
7cae9051 WW |
609 | write_inferior_memory (ipa_action, (unsigned char *) action, |
610 | sizeof (struct collect_static_trace_data_action)); | |
8d0d92cd YQ |
611 | |
612 | return ipa_action; | |
613 | } | |
614 | ||
42476b70 YQ |
615 | static char * |
616 | l_tracepoint_action_send (char *buffer, const struct tracepoint_action *action) | |
617 | { | |
618 | return buffer; | |
619 | } | |
620 | ||
7cae9051 WW |
621 | static char * |
622 | tracepoint_action_send (char *buffer, const struct tracepoint_action *action) | |
623 | { | |
624 | switch (action->type) | |
625 | { | |
626 | case 'M': | |
627 | return m_tracepoint_action_send (buffer, action); | |
628 | case 'R': | |
629 | return r_tracepoint_action_send (buffer, action); | |
630 | case 'X': | |
631 | return x_tracepoint_action_send (buffer, action); | |
632 | case 'L': | |
633 | return l_tracepoint_action_send (buffer, action); | |
634 | } | |
635 | error ("Unknown trace action '%c'.", action->type); | |
636 | } | |
637 | ||
638 | static CORE_ADDR | |
639 | tracepoint_action_download (const struct tracepoint_action *action) | |
8d0d92cd | 640 | { |
7cae9051 WW |
641 | switch (action->type) |
642 | { | |
643 | case 'M': | |
644 | return m_tracepoint_action_download (action); | |
645 | case 'R': | |
646 | return r_tracepoint_action_download (action); | |
647 | case 'X': | |
648 | return x_tracepoint_action_download (action); | |
649 | case 'L': | |
650 | return l_tracepoint_action_download (action); | |
651 | } | |
652 | error ("Unknown trace action '%c'.", action->type); | |
653 | } | |
8d0d92cd YQ |
654 | #endif |
655 | ||
219f2f23 PA |
656 | /* This structure describes a piece of the source-level definition of |
657 | the tracepoint. The contents are not interpreted by the target, | |
658 | but preserved verbatim for uploading upon reconnection. */ | |
659 | ||
660 | struct source_string | |
661 | { | |
662 | /* The type of string, such as "cond" for a conditional. */ | |
663 | char *type; | |
664 | ||
665 | /* The source-level string itself. For the sake of target | |
666 | debugging, we store it in plaintext, even though it is always | |
667 | transmitted in hex. */ | |
668 | char *str; | |
669 | ||
670 | /* Link to the next one in the list. We link them in the order | |
671 | received, in case some make up an ordered list of commands or | |
672 | some such. */ | |
673 | struct source_string *next; | |
674 | }; | |
675 | ||
fa593d66 PA |
676 | enum tracepoint_type |
677 | { | |
678 | /* Trap based tracepoint. */ | |
679 | trap_tracepoint, | |
680 | ||
681 | /* A fast tracepoint implemented with a jump instead of a trap. */ | |
682 | fast_tracepoint, | |
0fb4aa4b PA |
683 | |
684 | /* A static tracepoint, implemented by a program call into a tracing | |
685 | library. */ | |
686 | static_tracepoint | |
fa593d66 PA |
687 | }; |
688 | ||
219f2f23 PA |
689 | struct tracepoint_hit_ctx; |
690 | ||
d78908cf | 691 | typedef enum eval_result_type (*condfn) (unsigned char *, |
6a271cae PA |
692 | ULONGEST *); |
693 | ||
219f2f23 PA |
694 | /* The definition of a tracepoint. */ |
695 | ||
696 | /* Tracepoints may have multiple locations, each at a different | |
697 | address. This can occur with optimizations, template | |
698 | instantiation, etc. Since the locations may be in different | |
699 | scopes, the conditions and actions may be different for each | |
700 | location. Our target version of tracepoints is more like GDB's | |
701 | notion of "breakpoint locations", but we have almost nothing that | |
702 | is not per-location, so we bother having two kinds of objects. The | |
703 | key consequence is that numbers are not unique, and that it takes | |
704 | both number and address to identify a tracepoint uniquely. */ | |
705 | ||
706 | struct tracepoint | |
707 | { | |
708 | /* The number of the tracepoint, as specified by GDB. Several | |
709 | tracepoint objects here may share a number. */ | |
5f18041e | 710 | uint32_t number; |
219f2f23 PA |
711 | |
712 | /* Address at which the tracepoint is supposed to trigger. Several | |
713 | tracepoints may share an address. */ | |
714 | CORE_ADDR address; | |
715 | ||
fa593d66 PA |
716 | /* Tracepoint type. */ |
717 | enum tracepoint_type type; | |
718 | ||
219f2f23 | 719 | /* True if the tracepoint is currently enabled. */ |
5f18041e | 720 | int8_t enabled; |
219f2f23 PA |
721 | |
722 | /* The number of single steps that will be performed after each | |
723 | tracepoint hit. */ | |
5f18041e | 724 | uint64_t step_count; |
219f2f23 PA |
725 | |
726 | /* The number of times the tracepoint may be hit before it will | |
727 | terminate the entire tracing run. */ | |
5f18041e | 728 | uint64_t pass_count; |
219f2f23 PA |
729 | |
730 | /* Pointer to the agent expression that is the tracepoint's | |
731 | conditional, or NULL if the tracepoint is unconditional. */ | |
732 | struct agent_expr *cond; | |
733 | ||
734 | /* The list of actions to take when the tracepoint triggers. */ | |
5f18041e | 735 | uint32_t numactions; |
219f2f23 | 736 | struct tracepoint_action **actions; |
219f2f23 PA |
737 | |
738 | /* Count of the times we've hit this tracepoint during the run. | |
739 | Note that while-stepping steps are not counted as "hits". */ | |
5f18041e | 740 | uint64_t hit_count; |
219f2f23 | 741 | |
f196051f | 742 | /* Cached sum of the sizes of traceframes created by this point. */ |
5f18041e | 743 | uint64_t traceframe_usage; |
f196051f | 744 | |
6a271cae PA |
745 | CORE_ADDR compiled_cond; |
746 | ||
fa593d66 PA |
747 | /* Link to the next tracepoint in the list. */ |
748 | struct tracepoint *next; | |
749 | ||
750 | #ifndef IN_PROCESS_AGENT | |
751 | /* The list of actions to take when the tracepoint triggers, in | |
752 | string/packet form. */ | |
753 | char **actions_str; | |
754 | ||
219f2f23 PA |
755 | /* The collection of strings that describe the tracepoint as it was |
756 | entered into GDB. These are not used by the target, but are | |
757 | reported back to GDB upon reconnection. */ | |
758 | struct source_string *source_strings; | |
759 | ||
fa593d66 PA |
760 | /* The number of bytes displaced by fast tracepoints. It may subsume |
761 | multiple instructions, for multi-byte fast tracepoints. This | |
762 | field is only valid for fast tracepoints. */ | |
5f18041e | 763 | uint32_t orig_size; |
fa593d66 PA |
764 | |
765 | /* Only for fast tracepoints. */ | |
766 | CORE_ADDR obj_addr_on_target; | |
767 | ||
768 | /* Address range where the original instruction under a fast | |
769 | tracepoint was relocated to. (_end is actually one byte past | |
770 | the end). */ | |
771 | CORE_ADDR adjusted_insn_addr; | |
772 | CORE_ADDR adjusted_insn_addr_end; | |
773 | ||
774 | /* The address range of the piece of the jump pad buffer that was | |
775 | assigned to this fast tracepoint. (_end is actually one byte | |
776 | past the end).*/ | |
777 | CORE_ADDR jump_pad; | |
778 | CORE_ADDR jump_pad_end; | |
779 | ||
405f8e94 SS |
780 | /* The address range of the piece of the trampoline buffer that was |
781 | assigned to this fast tracepoint. (_end is actually one byte | |
782 | past the end). */ | |
783 | CORE_ADDR trampoline; | |
784 | CORE_ADDR trampoline_end; | |
785 | ||
fa593d66 PA |
786 | /* The list of actions to take while in a stepping loop. These |
787 | fields are only valid for patch-based tracepoints. */ | |
788 | int num_step_actions; | |
789 | struct tracepoint_action **step_actions; | |
790 | /* Same, but in string/packet form. */ | |
791 | char **step_actions_str; | |
792 | ||
793 | /* Handle returned by the breakpoint or tracepoint module when we | |
0fb4aa4b PA |
794 | inserted the trap or jump, or hooked into a static tracepoint. |
795 | NULL if we haven't inserted it yet. */ | |
219f2f23 | 796 | void *handle; |
fa593d66 | 797 | #endif |
219f2f23 | 798 | |
219f2f23 PA |
799 | }; |
800 | ||
fa593d66 PA |
801 | #ifndef IN_PROCESS_AGENT |
802 | ||
219f2f23 PA |
803 | /* Given `while-stepping', a thread may be collecting data for more |
804 | than one tracepoint simultaneously. On the other hand, the same | |
805 | tracepoint with a while-stepping action may be hit by more than one | |
806 | thread simultaneously (but not quite, each thread could be handling | |
807 | a different step). Each thread holds a list of these objects, | |
808 | representing the current step of each while-stepping action being | |
809 | collected. */ | |
810 | ||
811 | struct wstep_state | |
812 | { | |
813 | struct wstep_state *next; | |
814 | ||
815 | /* The tracepoint number. */ | |
816 | int tp_number; | |
817 | /* The tracepoint's address. */ | |
818 | CORE_ADDR tp_address; | |
819 | ||
820 | /* The number of the current step in this 'while-stepping' | |
821 | action. */ | |
822 | long current_step; | |
823 | }; | |
824 | ||
fa593d66 PA |
825 | #endif |
826 | ||
3c14e5a3 PA |
827 | EXTERN_C_PUSH |
828 | ||
fa593d66 PA |
829 | /* The linked list of all tracepoints. Marked explicitly as used as |
830 | the in-process library doesn't use it for the fast tracepoints | |
831 | support. */ | |
3c14e5a3 | 832 | IP_AGENT_EXPORT_VAR struct tracepoint *tracepoints; |
219f2f23 PA |
833 | |
834 | /* The first tracepoint to exceed its pass count. */ | |
835 | ||
3c14e5a3 | 836 | IP_AGENT_EXPORT_VAR struct tracepoint *stopping_tracepoint; |
219f2f23 PA |
837 | |
838 | /* True if the trace buffer is full or otherwise no longer usable. */ | |
839 | ||
3c14e5a3 | 840 | IP_AGENT_EXPORT_VAR int trace_buffer_is_full; |
219f2f23 | 841 | |
3c14e5a3 PA |
842 | /* The first error that occurred during expression evaluation. */ |
843 | ||
33ebda9d PA |
844 | /* Stored as an int to avoid the IPA ABI being dependent on whatever |
845 | the compiler decides to use for the enum's underlying type. Holds | |
846 | enum eval_result_type values. */ | |
847 | IP_AGENT_EXPORT_VAR int expr_eval_result = expr_eval_no_error; | |
3c14e5a3 PA |
848 | |
849 | EXTERN_C_POP | |
219f2f23 | 850 | |
fa593d66 PA |
851 | #ifndef IN_PROCESS_AGENT |
852 | ||
3c14e5a3 PA |
853 | /* Pointer to the last tracepoint in the list, new tracepoints are |
854 | linked in at the end. */ | |
855 | ||
856 | static struct tracepoint *last_tracepoint; | |
857 | ||
219f2f23 PA |
858 | static const char *eval_result_names[] = |
859 | { | |
860 | "terror:in the attic", /* this should never be reported */ | |
861 | "terror:empty expression", | |
862 | "terror:empty stack", | |
863 | "terror:stack overflow", | |
864 | "terror:stack underflow", | |
865 | "terror:unhandled opcode", | |
866 | "terror:unrecognized opcode", | |
867 | "terror:divide by zero" | |
868 | }; | |
869 | ||
fa593d66 PA |
870 | #endif |
871 | ||
219f2f23 PA |
872 | /* The tracepoint in which the error occurred. */ |
873 | ||
3c14e5a3 PA |
874 | EXTERN_C_PUSH |
875 | IP_AGENT_EXPORT_VAR struct tracepoint *error_tracepoint; | |
876 | EXTERN_C_POP | |
219f2f23 PA |
877 | |
878 | struct trace_state_variable | |
879 | { | |
880 | /* This is the name of the variable as used in GDB. The target | |
881 | doesn't use the name, but needs to have it for saving and | |
882 | reconnection purposes. */ | |
883 | char *name; | |
884 | ||
885 | /* This number identifies the variable uniquely. Numbers may be | |
886 | assigned either by the target (in the case of builtin variables), | |
887 | or by GDB, and are presumed unique during the course of a trace | |
888 | experiment. */ | |
889 | int number; | |
890 | ||
891 | /* The variable's initial value, a 64-bit signed integer always. */ | |
892 | LONGEST initial_value; | |
893 | ||
894 | /* The variable's value, a 64-bit signed integer always. */ | |
895 | LONGEST value; | |
896 | ||
897 | /* Pointer to a getter function, used to supply computed values. */ | |
898 | LONGEST (*getter) (void); | |
899 | ||
900 | /* Link to the next variable. */ | |
901 | struct trace_state_variable *next; | |
902 | }; | |
903 | ||
904 | /* Linked list of all trace state variables. */ | |
905 | ||
fa593d66 PA |
906 | #ifdef IN_PROCESS_AGENT |
907 | struct trace_state_variable *alloced_trace_state_variables; | |
908 | #endif | |
909 | ||
3c14e5a3 | 910 | IP_AGENT_EXPORT_VAR struct trace_state_variable *trace_state_variables; |
219f2f23 PA |
911 | |
912 | /* The results of tracing go into a fixed-size space known as the | |
913 | "trace buffer". Because usage follows a limited number of | |
914 | patterns, we manage it ourselves rather than with malloc. Basic | |
915 | rules are that we create only one trace frame at a time, each is | |
916 | variable in size, they are never moved once created, and we only | |
917 | discard if we are doing a circular buffer, and then only the oldest | |
918 | ones. Each trace frame includes its own size, so we don't need to | |
919 | link them together, and the trace frame number is relative to the | |
920 | first one, so we don't need to record numbers. A trace frame also | |
921 | records the number of the tracepoint that created it. The data | |
922 | itself is a series of blocks, each introduced by a single character | |
923 | and with a defined format. Each type of block has enough | |
924 | type/length info to allow scanners to jump quickly from one block | |
925 | to the next without reading each byte in the block. */ | |
926 | ||
927 | /* Trace buffer management would be simple - advance a free pointer | |
928 | from beginning to end, then stop - were it not for the circular | |
929 | buffer option, which is a useful way to prevent a trace run from | |
930 | stopping prematurely because the buffer filled up. In the circular | |
931 | case, the location of the first trace frame (trace_buffer_start) | |
932 | moves as old trace frames are discarded. Also, since we grow trace | |
933 | frames incrementally as actions are performed, we wrap around to | |
934 | the beginning of the trace buffer. This is per-block, so each | |
935 | block within a trace frame remains contiguous. Things get messy | |
936 | when the wrapped-around trace frame is the one being discarded; the | |
937 | free space ends up in two parts at opposite ends of the buffer. */ | |
938 | ||
939 | #ifndef ATTR_PACKED | |
940 | # if defined(__GNUC__) | |
941 | # define ATTR_PACKED __attribute__ ((packed)) | |
942 | # else | |
943 | # define ATTR_PACKED /* nothing */ | |
944 | # endif | |
945 | #endif | |
946 | ||
947 | /* The data collected at a tracepoint hit. This object should be as | |
948 | small as possible, since there may be a great many of them. We do | |
949 | not need to keep a frame number, because they are all sequential | |
950 | and there are no deletions; so the Nth frame in the buffer is | |
951 | always frame number N. */ | |
952 | ||
953 | struct traceframe | |
954 | { | |
955 | /* Number of the tracepoint that collected this traceframe. A value | |
956 | of 0 indicates the current end of the trace buffer. We make this | |
957 | a 16-bit field because it's never going to happen that GDB's | |
958 | numbering of tracepoints reaches 32,000. */ | |
959 | int tpnum : 16; | |
960 | ||
961 | /* The size of the data in this trace frame. We limit this to 32 | |
962 | bits, even on a 64-bit target, because it's just implausible that | |
963 | one is validly going to collect 4 gigabytes of data at a single | |
964 | tracepoint hit. */ | |
965 | unsigned int data_size : 32; | |
966 | ||
967 | /* The base of the trace data, which is contiguous from this point. */ | |
968 | unsigned char data[0]; | |
969 | ||
fa593d66 | 970 | } ATTR_PACKED; |
219f2f23 | 971 | |
3aafd2ff PA |
972 | /* The size of the EOB marker, in bytes. A traceframe with zeroed |
973 | fields (and no data) marks the end of trace data. */ | |
974 | #define TRACEFRAME_EOB_MARKER_SIZE offsetof (struct traceframe, data) | |
975 | ||
219f2f23 PA |
976 | /* The traceframe to be used as the source of data to send back to |
977 | GDB. A value of -1 means to get data from the live program. */ | |
978 | ||
979 | int current_traceframe = -1; | |
980 | ||
981 | /* This flag is true if the trace buffer is circular, meaning that | |
982 | when it fills, the oldest trace frames are discarded in order to | |
983 | make room. */ | |
984 | ||
fa593d66 | 985 | #ifndef IN_PROCESS_AGENT |
219f2f23 | 986 | static int circular_trace_buffer; |
fa593d66 | 987 | #endif |
219f2f23 | 988 | |
f6f899bf HAQ |
989 | /* Size of the trace buffer. */ |
990 | ||
991 | static LONGEST trace_buffer_size; | |
992 | ||
3c14e5a3 PA |
993 | EXTERN_C_PUSH |
994 | ||
219f2f23 PA |
995 | /* Pointer to the block of memory that traceframes all go into. */ |
996 | ||
3c14e5a3 | 997 | IP_AGENT_EXPORT_VAR unsigned char *trace_buffer_lo; |
219f2f23 PA |
998 | |
999 | /* Pointer to the end of the trace buffer, more precisely to the byte | |
1000 | after the end of the buffer. */ | |
1001 | ||
3c14e5a3 PA |
1002 | IP_AGENT_EXPORT_VAR unsigned char *trace_buffer_hi; |
1003 | ||
1004 | EXTERN_C_POP | |
219f2f23 | 1005 | |
fa593d66 PA |
1006 | /* Control structure holding the read/write/etc. pointers into the |
1007 | trace buffer. We need more than one of these to implement a | |
1008 | transaction-like mechanism to garantees that both GDBserver and the | |
1009 | in-process agent can try to change the trace buffer | |
1010 | simultaneously. */ | |
1011 | ||
1012 | struct trace_buffer_control | |
1013 | { | |
1014 | /* Pointer to the first trace frame in the buffer. In the | |
1015 | non-circular case, this is equal to trace_buffer_lo, otherwise it | |
1016 | moves around in the buffer. */ | |
1017 | unsigned char *start; | |
1018 | ||
1019 | /* Pointer to the free part of the trace buffer. Note that we clear | |
1020 | several bytes at and after this pointer, so that traceframe | |
1021 | scans/searches terminate properly. */ | |
1022 | unsigned char *free; | |
1023 | ||
1024 | /* Pointer to the byte after the end of the free part. Note that | |
1025 | this may be smaller than trace_buffer_free in the circular case, | |
1026 | and means that the free part is in two pieces. Initially it is | |
1027 | equal to trace_buffer_hi, then is generally equivalent to | |
1028 | trace_buffer_start. */ | |
1029 | unsigned char *end_free; | |
1030 | ||
1031 | /* Pointer to the wraparound. If not equal to trace_buffer_hi, then | |
1032 | this is the point at which the trace data breaks, and resumes at | |
1033 | trace_buffer_lo. */ | |
1034 | unsigned char *wrap; | |
1035 | }; | |
1036 | ||
1037 | /* Same as above, to be used by GDBserver when updating the in-process | |
1038 | agent. */ | |
1039 | struct ipa_trace_buffer_control | |
1040 | { | |
1041 | uintptr_t start; | |
1042 | uintptr_t free; | |
1043 | uintptr_t end_free; | |
1044 | uintptr_t wrap; | |
1045 | }; | |
1046 | ||
1047 | ||
1048 | /* We have possibly both GDBserver and an inferior thread accessing | |
1049 | the same IPA trace buffer memory. The IPA is the producer (tries | |
1050 | to put new frames in the buffer), while GDBserver occasionally | |
1051 | consumes them, that is, flushes the IPA's buffer into its own | |
1052 | buffer. Both sides need to update the trace buffer control | |
1053 | pointers (current head, tail, etc.). We can't use a global lock to | |
1054 | synchronize the accesses, as otherwise we could deadlock GDBserver | |
1055 | (if the thread holding the lock stops for a signal, say). So | |
1056 | instead of that, we use a transaction scheme where GDBserver writes | |
1057 | always prevail over the IPAs writes, and, we have the IPA detect | |
1058 | the commit failure/overwrite, and retry the whole attempt. This is | |
1059 | mainly implemented by having a global token object that represents | |
1060 | who wrote last to the buffer control structure. We need to freeze | |
1061 | any inferior writing to the buffer while GDBserver touches memory, | |
1062 | so that the inferior can correctly detect that GDBserver had been | |
1063 | there, otherwise, it could mistakingly think its commit was | |
1064 | successful; that's implemented by simply having GDBserver set a | |
1065 | breakpoint the inferior hits if it is the critical region. | |
1066 | ||
1067 | There are three cycling trace buffer control structure copies | |
1068 | (buffer head, tail, etc.), with the token object including an index | |
1069 | indicating which is current live copy. The IPA tentatively builds | |
1070 | an updated copy in a non-current control structure, while GDBserver | |
1071 | always clobbers the current version directly. The IPA then tries | |
1072 | to atomically "commit" its version; if GDBserver clobbered the | |
1073 | structure meanwhile, that will fail, and the IPA restarts the | |
1074 | allocation process. | |
1075 | ||
1076 | Listing the step in further detail, we have: | |
1077 | ||
1078 | In-process agent (producer): | |
1079 | ||
1080 | - passes by `about_to_request_buffer_space' breakpoint/lock | |
1081 | ||
1082 | - reads current token, extracts current trace buffer control index, | |
1083 | and starts tentatively updating the rightmost one (0->1, 1->2, | |
1084 | 2->0). Note that only one inferior thread is executing this code | |
1085 | at any given time, due to an outer lock in the jump pads. | |
219f2f23 | 1086 | |
fa593d66 | 1087 | - updates counters, and tries to commit the token. |
219f2f23 | 1088 | |
fa593d66 PA |
1089 | - passes by second `about_to_request_buffer_space' breakpoint/lock, |
1090 | leaving the sync region. | |
219f2f23 | 1091 | |
fa593d66 | 1092 | - checks if the update was effective. |
219f2f23 | 1093 | |
fa593d66 PA |
1094 | - if trace buffer was found full, hits flush_trace_buffer |
1095 | breakpoint, and restarts later afterwards. | |
219f2f23 | 1096 | |
fa593d66 | 1097 | GDBserver (consumer): |
219f2f23 | 1098 | |
fa593d66 PA |
1099 | - sets `about_to_request_buffer_space' breakpoint/lock. |
1100 | ||
1101 | - updates the token unconditionally, using the current buffer | |
1102 | control index, since it knows that the IP agent always writes to | |
1103 | the rightmost, and due to the breakpoint, at most one IP thread | |
1104 | can try to update the trace buffer concurrently to GDBserver, so | |
1105 | there will be no danger of trace buffer control index wrap making | |
1106 | the IPA write to the same index as GDBserver. | |
1107 | ||
1108 | - flushes the IP agent's trace buffer completely, and updates the | |
1109 | current trace buffer control structure. GDBserver *always* wins. | |
1110 | ||
1111 | - removes the `about_to_request_buffer_space' breakpoint. | |
1112 | ||
1113 | The token is stored in the `trace_buffer_ctrl_curr' variable. | |
1114 | Internally, it's bits are defined as: | |
1115 | ||
1116 | |-------------+-----+-------------+--------+-------------+--------------| | |
1117 | | Bit offsets | 31 | 30 - 20 | 19 | 18-8 | 7-0 | | |
1118 | |-------------+-----+-------------+--------+-------------+--------------| | |
1119 | | What | GSB | PC (11-bit) | unused | CC (11-bit) | TBCI (8-bit) | | |
1120 | |-------------+-----+-------------+--------+-------------+--------------| | |
1121 | ||
1122 | GSB - GDBserver Stamp Bit | |
1123 | PC - Previous Counter | |
1124 | CC - Current Counter | |
1125 | TBCI - Trace Buffer Control Index | |
1126 | ||
1127 | ||
1128 | An IPA update of `trace_buffer_ctrl_curr' does: | |
1129 | ||
1130 | - read CC from the current token, save as PC. | |
1131 | - updates pointers | |
1132 | - atomically tries to write PC+1,CC | |
1133 | ||
1134 | A GDBserver update of `trace_buffer_ctrl_curr' does: | |
1135 | ||
1136 | - reads PC and CC from the current token. | |
1137 | - updates pointers | |
1138 | - writes GSB,PC,CC | |
1139 | */ | |
1140 | ||
1141 | /* These are the bits of `trace_buffer_ctrl_curr' that are reserved | |
1142 | for the counters described below. The cleared bits are used to | |
1143 | hold the index of the items of the `trace_buffer_ctrl' array that | |
1144 | is "current". */ | |
1145 | #define GDBSERVER_FLUSH_COUNT_MASK 0xfffffff0 | |
1146 | ||
1147 | /* `trace_buffer_ctrl_curr' contains two counters. The `previous' | |
1148 | counter, and the `current' counter. */ | |
1149 | ||
1150 | #define GDBSERVER_FLUSH_COUNT_MASK_PREV 0x7ff00000 | |
1151 | #define GDBSERVER_FLUSH_COUNT_MASK_CURR 0x0007ff00 | |
1152 | ||
1153 | /* When GDBserver update the IP agent's `trace_buffer_ctrl_curr', it | |
1154 | always stamps this bit as set. */ | |
1155 | #define GDBSERVER_UPDATED_FLUSH_COUNT_BIT 0x80000000 | |
1156 | ||
1157 | #ifdef IN_PROCESS_AGENT | |
3c14e5a3 PA |
1158 | IP_AGENT_EXPORT_VAR struct trace_buffer_control trace_buffer_ctrl[3]; |
1159 | IP_AGENT_EXPORT_VAR unsigned int trace_buffer_ctrl_curr; | |
fa593d66 PA |
1160 | |
1161 | # define TRACE_BUFFER_CTRL_CURR \ | |
1162 | (trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK) | |
1163 | ||
1164 | #else | |
1165 | ||
1166 | /* The GDBserver side agent only needs one instance of this object, as | |
1167 | it doesn't need to sync with itself. Define it as array anyway so | |
1168 | that the rest of the code base doesn't need to care for the | |
1169 | difference. */ | |
1170 | struct trace_buffer_control trace_buffer_ctrl[1]; | |
1171 | # define TRACE_BUFFER_CTRL_CURR 0 | |
1172 | #endif | |
1173 | ||
1174 | /* These are convenience macros used to access the current trace | |
1175 | buffer control in effect. */ | |
1176 | #define trace_buffer_start (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].start) | |
1177 | #define trace_buffer_free (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].free) | |
1178 | #define trace_buffer_end_free \ | |
1179 | (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].end_free) | |
1180 | #define trace_buffer_wrap (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].wrap) | |
219f2f23 | 1181 | |
219f2f23 PA |
1182 | |
1183 | /* Macro that returns a pointer to the first traceframe in the buffer. */ | |
1184 | ||
1185 | #define FIRST_TRACEFRAME() ((struct traceframe *) trace_buffer_start) | |
1186 | ||
1187 | /* Macro that returns a pointer to the next traceframe in the buffer. | |
1188 | If the computed location is beyond the wraparound point, subtract | |
1189 | the offset of the wraparound. */ | |
1190 | ||
1191 | #define NEXT_TRACEFRAME_1(TF) \ | |
1192 | (((unsigned char *) (TF)) + sizeof (struct traceframe) + (TF)->data_size) | |
1193 | ||
1194 | #define NEXT_TRACEFRAME(TF) \ | |
1195 | ((struct traceframe *) (NEXT_TRACEFRAME_1 (TF) \ | |
1196 | - ((NEXT_TRACEFRAME_1 (TF) >= trace_buffer_wrap) \ | |
1197 | ? (trace_buffer_wrap - trace_buffer_lo) \ | |
1198 | : 0))) | |
1199 | ||
1200 | /* The difference between these counters represents the total number | |
fa593d66 PA |
1201 | of complete traceframes present in the trace buffer. The IP agent |
1202 | writes to the write count, GDBserver writes to read count. */ | |
219f2f23 | 1203 | |
3c14e5a3 PA |
1204 | IP_AGENT_EXPORT_VAR unsigned int traceframe_write_count; |
1205 | IP_AGENT_EXPORT_VAR unsigned int traceframe_read_count; | |
219f2f23 PA |
1206 | |
1207 | /* Convenience macro. */ | |
1208 | ||
1209 | #define traceframe_count \ | |
1210 | ((unsigned int) (traceframe_write_count - traceframe_read_count)) | |
1211 | ||
1212 | /* The count of all traceframes created in the current run, including | |
1213 | ones that were discarded to make room. */ | |
1214 | ||
3c14e5a3 | 1215 | IP_AGENT_EXPORT_VAR int traceframes_created; |
fa593d66 PA |
1216 | |
1217 | #ifndef IN_PROCESS_AGENT | |
219f2f23 PA |
1218 | |
1219 | /* Read-only regions are address ranges whose contents don't change, | |
1220 | and so can be read from target memory even while looking at a trace | |
1221 | frame. Without these, disassembly for instance will likely fail, | |
1222 | because the program code is not usually collected into a trace | |
1223 | frame. This data structure does not need to be very complicated or | |
1224 | particularly efficient, it's only going to be used occasionally, | |
1225 | and only by some commands. */ | |
1226 | ||
1227 | struct readonly_region | |
1228 | { | |
1229 | /* The bounds of the region. */ | |
1230 | CORE_ADDR start, end; | |
1231 | ||
1232 | /* Link to the next one. */ | |
1233 | struct readonly_region *next; | |
1234 | }; | |
1235 | ||
1236 | /* Linked list of readonly regions. This list stays in effect from | |
1237 | one tstart to the next. */ | |
1238 | ||
1239 | static struct readonly_region *readonly_regions; | |
1240 | ||
fa593d66 PA |
1241 | #endif |
1242 | ||
219f2f23 PA |
1243 | /* The global that controls tracing overall. */ |
1244 | ||
3c14e5a3 | 1245 | IP_AGENT_EXPORT_VAR int tracing; |
fa593d66 PA |
1246 | |
1247 | #ifndef IN_PROCESS_AGENT | |
8336d594 PA |
1248 | |
1249 | /* Controls whether tracing should continue after GDB disconnects. */ | |
1250 | ||
1251 | int disconnected_tracing; | |
219f2f23 PA |
1252 | |
1253 | /* The reason for the last tracing run to have stopped. We initialize | |
1254 | to a distinct string so that GDB can distinguish between "stopped | |
1255 | after running" and "stopped because never run" cases. */ | |
1256 | ||
1257 | static const char *tracing_stop_reason = "tnotrun"; | |
1258 | ||
1259 | static int tracing_stop_tpnum; | |
1260 | ||
f196051f SS |
1261 | /* 64-bit timestamps for the trace run's start and finish, expressed |
1262 | in microseconds from the Unix epoch. */ | |
1263 | ||
1264 | LONGEST tracing_start_time; | |
1265 | LONGEST tracing_stop_time; | |
1266 | ||
1267 | /* The (optional) user-supplied name of the user that started the run. | |
1268 | This is an arbitrary string, and may be NULL. */ | |
1269 | ||
1270 | char *tracing_user_name; | |
1271 | ||
1272 | /* Optional user-supplied text describing the run. This is | |
1273 | an arbitrary string, and may be NULL. */ | |
1274 | ||
1275 | char *tracing_notes; | |
1276 | ||
1277 | /* Optional user-supplied text explaining a tstop command. This is an | |
1278 | arbitrary string, and may be NULL. */ | |
1279 | ||
1280 | char *tracing_stop_note; | |
1281 | ||
fa593d66 PA |
1282 | #endif |
1283 | ||
219f2f23 PA |
1284 | /* Functions local to this file. */ |
1285 | ||
1286 | /* Base "class" for tracepoint type specific data to be passed down to | |
fa593d66 | 1287 | collect_data_at_tracepoint. */ |
219f2f23 PA |
1288 | struct tracepoint_hit_ctx |
1289 | { | |
fa593d66 | 1290 | enum tracepoint_type type; |
219f2f23 PA |
1291 | }; |
1292 | ||
fa593d66 PA |
1293 | #ifdef IN_PROCESS_AGENT |
1294 | ||
1295 | /* Fast/jump tracepoint specific data to be passed down to | |
219f2f23 | 1296 | collect_data_at_tracepoint. */ |
fa593d66 PA |
1297 | struct fast_tracepoint_ctx |
1298 | { | |
1299 | struct tracepoint_hit_ctx base; | |
1300 | ||
1301 | struct regcache regcache; | |
1302 | int regcache_initted; | |
1303 | unsigned char *regspace; | |
1304 | ||
1305 | unsigned char *regs; | |
1306 | struct tracepoint *tpoint; | |
1307 | }; | |
219f2f23 | 1308 | |
0fb4aa4b PA |
1309 | /* Static tracepoint specific data to be passed down to |
1310 | collect_data_at_tracepoint. */ | |
1311 | struct static_tracepoint_ctx | |
1312 | { | |
1313 | struct tracepoint_hit_ctx base; | |
1314 | ||
1315 | /* The regcache corresponding to the registers state at the time of | |
1316 | the tracepoint hit. Initialized lazily, from REGS. */ | |
1317 | struct regcache regcache; | |
1318 | int regcache_initted; | |
1319 | ||
1320 | /* The buffer space REGCACHE above uses. We use a separate buffer | |
1321 | instead of letting the regcache malloc for both signal safety and | |
1322 | performance reasons; this is allocated on the stack instead. */ | |
1323 | unsigned char *regspace; | |
1324 | ||
1325 | /* The register buffer as passed on by lttng/ust. */ | |
1326 | struct registers *regs; | |
1327 | ||
1328 | /* The "printf" formatter and the args the user passed to the marker | |
1329 | call. We use this to be able to collect "static trace data" | |
1330 | ($_sdata). */ | |
1331 | const char *fmt; | |
1332 | va_list *args; | |
1333 | ||
1334 | /* The GDB tracepoint matching the probed marker that was "hit". */ | |
1335 | struct tracepoint *tpoint; | |
1336 | }; | |
1337 | ||
fa593d66 PA |
1338 | #else |
1339 | ||
1340 | /* Static tracepoint specific data to be passed down to | |
1341 | collect_data_at_tracepoint. */ | |
219f2f23 PA |
1342 | struct trap_tracepoint_ctx |
1343 | { | |
1344 | struct tracepoint_hit_ctx base; | |
1345 | ||
1346 | struct regcache *regcache; | |
1347 | }; | |
1348 | ||
fa593d66 PA |
1349 | #endif |
1350 | ||
fa593d66 | 1351 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1352 | static CORE_ADDR traceframe_get_pc (struct traceframe *tframe); |
1353 | static int traceframe_read_tsv (int num, LONGEST *val); | |
fa593d66 | 1354 | #endif |
219f2f23 PA |
1355 | |
1356 | static int condition_true_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
1357 | struct tracepoint *tpoint); | |
1358 | ||
fa593d66 | 1359 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1360 | static void clear_readonly_regions (void); |
1361 | static void clear_installed_tracepoints (void); | |
fa593d66 | 1362 | #endif |
219f2f23 PA |
1363 | |
1364 | static void collect_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
1365 | CORE_ADDR stop_pc, | |
1366 | struct tracepoint *tpoint); | |
fa593d66 | 1367 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1368 | static void collect_data_at_step (struct tracepoint_hit_ctx *ctx, |
1369 | CORE_ADDR stop_pc, | |
1370 | struct tracepoint *tpoint, int current_step); | |
6a271cae PA |
1371 | static void compile_tracepoint_condition (struct tracepoint *tpoint, |
1372 | CORE_ADDR *jump_entry); | |
fa593d66 | 1373 | #endif |
219f2f23 PA |
1374 | static void do_action_at_tracepoint (struct tracepoint_hit_ctx *ctx, |
1375 | CORE_ADDR stop_pc, | |
1376 | struct tracepoint *tpoint, | |
1377 | struct traceframe *tframe, | |
1378 | struct tracepoint_action *taction); | |
1379 | ||
fa593d66 PA |
1380 | #ifndef IN_PROCESS_AGENT |
1381 | static struct tracepoint *fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR); | |
1e4d1764 YQ |
1382 | |
1383 | static void install_tracepoint (struct tracepoint *, char *own_buf); | |
1384 | static void download_tracepoint (struct tracepoint *); | |
405f8e94 | 1385 | static int install_fast_tracepoint (struct tracepoint *, char *errbuf); |
fc3e5175 YQ |
1386 | static void clone_fast_tracepoint (struct tracepoint *to, |
1387 | const struct tracepoint *from); | |
fa593d66 PA |
1388 | #endif |
1389 | ||
f196051f SS |
1390 | static LONGEST get_timestamp (void); |
1391 | ||
fa593d66 PA |
1392 | #if defined(__GNUC__) |
1393 | # define memory_barrier() asm volatile ("" : : : "memory") | |
1394 | #else | |
1395 | # define memory_barrier() do {} while (0) | |
1396 | #endif | |
1397 | ||
1398 | /* We only build the IPA if this builtin is supported, and there are | |
1399 | no uses of this in GDBserver itself, so we're safe in defining this | |
1400 | unconditionally. */ | |
1401 | #define cmpxchg(mem, oldval, newval) \ | |
1402 | __sync_val_compare_and_swap (mem, oldval, newval) | |
1403 | ||
219f2f23 PA |
1404 | /* Record that an error occurred during expression evaluation. */ |
1405 | ||
1406 | static void | |
1407 | record_tracepoint_error (struct tracepoint *tpoint, const char *which, | |
1408 | enum eval_result_type rtype) | |
1409 | { | |
1410 | trace_debug ("Tracepoint %d at %s %s eval reports error %d", | |
1411 | tpoint->number, paddress (tpoint->address), which, rtype); | |
1412 | ||
fa593d66 PA |
1413 | #ifdef IN_PROCESS_AGENT |
1414 | /* Only record the first error we get. */ | |
1415 | if (cmpxchg (&expr_eval_result, | |
1416 | expr_eval_no_error, | |
1417 | rtype) != expr_eval_no_error) | |
1418 | return; | |
1419 | #else | |
1420 | if (expr_eval_result != expr_eval_no_error) | |
1421 | return; | |
1422 | #endif | |
1423 | ||
219f2f23 PA |
1424 | error_tracepoint = tpoint; |
1425 | } | |
1426 | ||
1427 | /* Trace buffer management. */ | |
1428 | ||
1429 | static void | |
1430 | clear_trace_buffer (void) | |
1431 | { | |
1432 | trace_buffer_start = trace_buffer_lo; | |
1433 | trace_buffer_free = trace_buffer_lo; | |
1434 | trace_buffer_end_free = trace_buffer_hi; | |
1435 | trace_buffer_wrap = trace_buffer_hi; | |
1436 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1437 | ((struct traceframe *) trace_buffer_free)->tpnum = 0; | |
1438 | ((struct traceframe *) trace_buffer_free)->data_size = 0; | |
1439 | traceframe_read_count = traceframe_write_count = 0; | |
1440 | traceframes_created = 0; | |
1441 | } | |
1442 | ||
fa593d66 PA |
1443 | #ifndef IN_PROCESS_AGENT |
1444 | ||
1445 | static void | |
1446 | clear_inferior_trace_buffer (void) | |
1447 | { | |
1448 | CORE_ADDR ipa_trace_buffer_lo; | |
1449 | CORE_ADDR ipa_trace_buffer_hi; | |
1450 | struct traceframe ipa_traceframe = { 0 }; | |
1451 | struct ipa_trace_buffer_control ipa_trace_buffer_ctrl; | |
1452 | ||
1453 | read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_lo, | |
1454 | &ipa_trace_buffer_lo); | |
1455 | read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_hi, | |
1456 | &ipa_trace_buffer_hi); | |
1457 | ||
1458 | ipa_trace_buffer_ctrl.start = ipa_trace_buffer_lo; | |
1459 | ipa_trace_buffer_ctrl.free = ipa_trace_buffer_lo; | |
1460 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_hi; | |
1461 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
1462 | ||
1463 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1464 | write_inferior_memory (ipa_sym_addrs.addr_trace_buffer_ctrl, | |
1465 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
1466 | sizeof (ipa_trace_buffer_ctrl)); | |
1467 | ||
1468 | write_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, 0); | |
1469 | ||
1470 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1471 | write_inferior_memory (ipa_trace_buffer_lo, | |
1472 | (unsigned char *) &ipa_traceframe, | |
1473 | sizeof (ipa_traceframe)); | |
1474 | ||
1475 | write_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, 0); | |
1476 | write_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, 0); | |
1477 | write_inferior_integer (ipa_sym_addrs.addr_traceframes_created, 0); | |
1478 | } | |
1479 | ||
1480 | #endif | |
1481 | ||
219f2f23 | 1482 | static void |
f6f899bf | 1483 | init_trace_buffer (LONGEST bufsize) |
219f2f23 | 1484 | { |
3aafd2ff PA |
1485 | size_t alloc_size; |
1486 | ||
f6f899bf HAQ |
1487 | trace_buffer_size = bufsize; |
1488 | ||
3aafd2ff PA |
1489 | /* Make sure to internally allocate at least space for the EOB |
1490 | marker. */ | |
1491 | alloc_size = (bufsize < TRACEFRAME_EOB_MARKER_SIZE | |
1492 | ? TRACEFRAME_EOB_MARKER_SIZE : bufsize); | |
224c3ddb | 1493 | trace_buffer_lo = (unsigned char *) xrealloc (trace_buffer_lo, alloc_size); |
f6f899bf | 1494 | |
3aafd2ff | 1495 | trace_buffer_hi = trace_buffer_lo + trace_buffer_size; |
219f2f23 PA |
1496 | |
1497 | clear_trace_buffer (); | |
1498 | } | |
1499 | ||
fa593d66 PA |
1500 | #ifdef IN_PROCESS_AGENT |
1501 | ||
3c14e5a3 | 1502 | IP_AGENT_EXPORT_FUNC void |
fa593d66 PA |
1503 | about_to_request_buffer_space (void) |
1504 | { | |
1505 | /* GDBserver places breakpoint here while it goes about to flush | |
1506 | data at random times. */ | |
1507 | UNKNOWN_SIDE_EFFECTS(); | |
1508 | } | |
1509 | ||
1510 | #endif | |
1511 | ||
219f2f23 PA |
1512 | /* Carve out a piece of the trace buffer, returning NULL in case of |
1513 | failure. */ | |
1514 | ||
1515 | static void * | |
1516 | trace_buffer_alloc (size_t amt) | |
1517 | { | |
1518 | unsigned char *rslt; | |
fa593d66 PA |
1519 | struct trace_buffer_control *tbctrl; |
1520 | unsigned int curr; | |
1521 | #ifdef IN_PROCESS_AGENT | |
1522 | unsigned int prev, prev_filtered; | |
1523 | unsigned int commit_count; | |
1524 | unsigned int commit; | |
1525 | unsigned int readout; | |
1526 | #else | |
219f2f23 PA |
1527 | struct traceframe *oldest; |
1528 | unsigned char *new_start; | |
fa593d66 | 1529 | #endif |
219f2f23 PA |
1530 | |
1531 | trace_debug ("Want to allocate %ld+%ld bytes in trace buffer", | |
1532 | (long) amt, (long) sizeof (struct traceframe)); | |
1533 | ||
1534 | /* Account for the EOB marker. */ | |
3aafd2ff | 1535 | amt += TRACEFRAME_EOB_MARKER_SIZE; |
219f2f23 | 1536 | |
fa593d66 PA |
1537 | #ifdef IN_PROCESS_AGENT |
1538 | again: | |
1539 | memory_barrier (); | |
1540 | ||
1541 | /* Read the current token and extract the index to try to write to, | |
1542 | storing it in CURR. */ | |
1543 | prev = trace_buffer_ctrl_curr; | |
1544 | prev_filtered = prev & ~GDBSERVER_FLUSH_COUNT_MASK; | |
1545 | curr = prev_filtered + 1; | |
1546 | if (curr > 2) | |
1547 | curr = 0; | |
1548 | ||
1549 | about_to_request_buffer_space (); | |
1550 | ||
1551 | /* Start out with a copy of the current state. GDBserver may be | |
1552 | midway writing to the PREV_FILTERED TBC, but, that's OK, we won't | |
1553 | be able to commit anyway if that happens. */ | |
1554 | trace_buffer_ctrl[curr] | |
1555 | = trace_buffer_ctrl[prev_filtered]; | |
1556 | trace_debug ("trying curr=%u", curr); | |
1557 | #else | |
1558 | /* The GDBserver's agent doesn't need all that syncing, and always | |
1559 | updates TCB 0 (there's only one, mind you). */ | |
1560 | curr = 0; | |
1561 | #endif | |
1562 | tbctrl = &trace_buffer_ctrl[curr]; | |
1563 | ||
219f2f23 PA |
1564 | /* Offsets are easier to grok for debugging than raw addresses, |
1565 | especially for the small trace buffer sizes that are useful for | |
1566 | testing. */ | |
fa593d66 PA |
1567 | trace_debug ("Trace buffer [%d] start=%d free=%d endfree=%d wrap=%d hi=%d", |
1568 | curr, | |
1569 | (int) (tbctrl->start - trace_buffer_lo), | |
1570 | (int) (tbctrl->free - trace_buffer_lo), | |
1571 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1572 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1573 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1574 | ||
1575 | /* The algorithm here is to keep trying to get a contiguous block of | |
1576 | the requested size, possibly discarding older traceframes to free | |
1577 | up space. Since free space might come in one or two pieces, | |
1578 | depending on whether discarded traceframes wrapped around at the | |
1579 | high end of the buffer, we test both pieces after each | |
1580 | discard. */ | |
1581 | while (1) | |
1582 | { | |
1583 | /* First, if we have two free parts, try the upper one first. */ | |
fa593d66 | 1584 | if (tbctrl->end_free < tbctrl->free) |
219f2f23 | 1585 | { |
fa593d66 | 1586 | if (tbctrl->free + amt <= trace_buffer_hi) |
219f2f23 PA |
1587 | /* We have enough in the upper part. */ |
1588 | break; | |
1589 | else | |
1590 | { | |
1591 | /* Our high part of free space wasn't enough. Give up | |
1592 | on it for now, set wraparound. We will recover the | |
1593 | space later, if/when the wrapped-around traceframe is | |
1594 | discarded. */ | |
1595 | trace_debug ("Upper part too small, setting wraparound"); | |
fa593d66 PA |
1596 | tbctrl->wrap = tbctrl->free; |
1597 | tbctrl->free = trace_buffer_lo; | |
219f2f23 PA |
1598 | } |
1599 | } | |
1600 | ||
1601 | /* The normal case. */ | |
fa593d66 | 1602 | if (tbctrl->free + amt <= tbctrl->end_free) |
219f2f23 PA |
1603 | break; |
1604 | ||
fa593d66 PA |
1605 | #ifdef IN_PROCESS_AGENT |
1606 | /* The IP Agent's buffer is always circular. It isn't used | |
1607 | currently, but `circular_trace_buffer' could represent | |
1608 | GDBserver's mode. If we didn't find space, ask GDBserver to | |
1609 | flush. */ | |
1610 | ||
1611 | flush_trace_buffer (); | |
1612 | memory_barrier (); | |
1613 | if (tracing) | |
1614 | { | |
1615 | trace_debug ("gdbserver flushed buffer, retrying"); | |
1616 | goto again; | |
1617 | } | |
1618 | ||
1619 | /* GDBserver cancelled the tracing. Bail out as well. */ | |
1620 | return NULL; | |
1621 | #else | |
219f2f23 PA |
1622 | /* If we're here, then neither part is big enough, and |
1623 | non-circular trace buffers are now full. */ | |
1624 | if (!circular_trace_buffer) | |
1625 | { | |
1626 | trace_debug ("Not enough space in the trace buffer"); | |
1627 | return NULL; | |
1628 | } | |
1629 | ||
1630 | trace_debug ("Need more space in the trace buffer"); | |
1631 | ||
1632 | /* If we have a circular buffer, we can try discarding the | |
1633 | oldest traceframe and see if that helps. */ | |
1634 | oldest = FIRST_TRACEFRAME (); | |
1635 | if (oldest->tpnum == 0) | |
1636 | { | |
1637 | /* Not good; we have no traceframes to free. Perhaps we're | |
1638 | asking for a block that is larger than the buffer? In | |
1639 | any case, give up. */ | |
1640 | trace_debug ("No traceframes to discard"); | |
1641 | return NULL; | |
1642 | } | |
1643 | ||
fa593d66 PA |
1644 | /* We don't run this code in the in-process agent currently. |
1645 | E.g., we could leave the in-process agent in autonomous | |
1646 | circular mode if we only have fast tracepoints. If we do | |
1647 | that, then this bit becomes racy with GDBserver, which also | |
1648 | writes to this counter. */ | |
219f2f23 PA |
1649 | --traceframe_write_count; |
1650 | ||
1651 | new_start = (unsigned char *) NEXT_TRACEFRAME (oldest); | |
1652 | /* If we freed the traceframe that wrapped around, go back | |
1653 | to the non-wrap case. */ | |
fa593d66 | 1654 | if (new_start < tbctrl->start) |
219f2f23 PA |
1655 | { |
1656 | trace_debug ("Discarding past the wraparound"); | |
fa593d66 | 1657 | tbctrl->wrap = trace_buffer_hi; |
219f2f23 | 1658 | } |
fa593d66 PA |
1659 | tbctrl->start = new_start; |
1660 | tbctrl->end_free = tbctrl->start; | |
219f2f23 PA |
1661 | |
1662 | trace_debug ("Discarded a traceframe\n" | |
fa593d66 PA |
1663 | "Trace buffer [%d], start=%d free=%d " |
1664 | "endfree=%d wrap=%d hi=%d", | |
1665 | curr, | |
1666 | (int) (tbctrl->start - trace_buffer_lo), | |
1667 | (int) (tbctrl->free - trace_buffer_lo), | |
1668 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1669 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1670 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1671 | ||
1672 | /* Now go back around the loop. The discard might have resulted | |
1673 | in either one or two pieces of free space, so we want to try | |
1674 | both before freeing any more traceframes. */ | |
fa593d66 | 1675 | #endif |
219f2f23 PA |
1676 | } |
1677 | ||
1678 | /* If we get here, we know we can provide the asked-for space. */ | |
1679 | ||
fa593d66 | 1680 | rslt = tbctrl->free; |
219f2f23 PA |
1681 | |
1682 | /* Adjust the request back down, now that we know we have space for | |
fa593d66 PA |
1683 | the marker, but don't commit to AMT yet, we may still need to |
1684 | restart the operation if GDBserver touches the trace buffer | |
1685 | (obviously only important in the in-process agent's version). */ | |
1686 | tbctrl->free += (amt - sizeof (struct traceframe)); | |
1687 | ||
1688 | /* Or not. If GDBserver changed the trace buffer behind our back, | |
1689 | we get to restart a new allocation attempt. */ | |
1690 | ||
1691 | #ifdef IN_PROCESS_AGENT | |
1692 | /* Build the tentative token. */ | |
2ece8244 YQ |
1693 | commit_count = (((prev & GDBSERVER_FLUSH_COUNT_MASK_CURR) + 0x100) |
1694 | & GDBSERVER_FLUSH_COUNT_MASK_CURR); | |
1695 | commit = (((prev & GDBSERVER_FLUSH_COUNT_MASK_CURR) << 12) | |
fa593d66 PA |
1696 | | commit_count |
1697 | | curr); | |
1698 | ||
1699 | /* Try to commit it. */ | |
1700 | readout = cmpxchg (&trace_buffer_ctrl_curr, prev, commit); | |
1701 | if (readout != prev) | |
1702 | { | |
1703 | trace_debug ("GDBserver has touched the trace buffer, restarting." | |
1704 | " (prev=%08x, commit=%08x, readout=%08x)", | |
1705 | prev, commit, readout); | |
1706 | goto again; | |
1707 | } | |
219f2f23 | 1708 | |
fa593d66 PA |
1709 | /* Hold your horses here. Even if that change was committed, |
1710 | GDBserver could come in, and clobber it. We need to hold to be | |
1711 | able to tell if GDBserver clobbers before or after we committed | |
1712 | the change. Whenever GDBserver goes about touching the IPA | |
1713 | buffer, it sets a breakpoint in this routine, so we have a sync | |
1714 | point here. */ | |
1715 | about_to_request_buffer_space (); | |
219f2f23 | 1716 | |
fa593d66 PA |
1717 | /* Check if the change has been effective, even if GDBserver stopped |
1718 | us at the breakpoint. */ | |
219f2f23 | 1719 | |
fa593d66 PA |
1720 | { |
1721 | unsigned int refetch; | |
219f2f23 | 1722 | |
fa593d66 PA |
1723 | memory_barrier (); |
1724 | ||
1725 | refetch = trace_buffer_ctrl_curr; | |
1726 | ||
2ece8244 YQ |
1727 | if (refetch == commit |
1728 | || ((refetch & GDBSERVER_FLUSH_COUNT_MASK_PREV) >> 12) == commit_count) | |
fa593d66 PA |
1729 | { |
1730 | /* effective */ | |
1731 | trace_debug ("change is effective: (prev=%08x, commit=%08x, " | |
1732 | "readout=%08x, refetch=%08x)", | |
1733 | prev, commit, readout, refetch); | |
1734 | } | |
1735 | else | |
1736 | { | |
1737 | trace_debug ("GDBserver has touched the trace buffer, not effective." | |
1738 | " (prev=%08x, commit=%08x, readout=%08x, refetch=%08x)", | |
1739 | prev, commit, readout, refetch); | |
1740 | goto again; | |
1741 | } | |
1742 | } | |
1743 | #endif | |
1744 | ||
1745 | /* We have a new piece of the trace buffer. Hurray! */ | |
1746 | ||
1747 | /* Add an EOB marker just past this allocation. */ | |
1748 | ((struct traceframe *) tbctrl->free)->tpnum = 0; | |
1749 | ((struct traceframe *) tbctrl->free)->data_size = 0; | |
1750 | ||
1751 | /* Adjust the request back down, now that we know we have space for | |
1752 | the marker. */ | |
1753 | amt -= sizeof (struct traceframe); | |
1754 | ||
1755 | if (debug_threads) | |
1756 | { | |
219f2f23 | 1757 | trace_debug ("Allocated %d bytes", (int) amt); |
fa593d66 PA |
1758 | trace_debug ("Trace buffer [%d] start=%d free=%d " |
1759 | "endfree=%d wrap=%d hi=%d", | |
1760 | curr, | |
1761 | (int) (tbctrl->start - trace_buffer_lo), | |
1762 | (int) (tbctrl->free - trace_buffer_lo), | |
1763 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1764 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1765 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1766 | } | |
1767 | ||
1768 | return rslt; | |
1769 | } | |
1770 | ||
fa593d66 PA |
1771 | #ifndef IN_PROCESS_AGENT |
1772 | ||
219f2f23 PA |
1773 | /* Return the total free space. This is not necessarily the largest |
1774 | block we can allocate, because of the two-part case. */ | |
1775 | ||
1776 | static int | |
1777 | free_space (void) | |
1778 | { | |
1779 | if (trace_buffer_free <= trace_buffer_end_free) | |
1780 | return trace_buffer_end_free - trace_buffer_free; | |
1781 | else | |
1782 | return ((trace_buffer_end_free - trace_buffer_lo) | |
1783 | + (trace_buffer_hi - trace_buffer_free)); | |
1784 | } | |
1785 | ||
1786 | /* An 'S' in continuation packets indicates remainder are for | |
1787 | while-stepping. */ | |
1788 | ||
1789 | static int seen_step_action_flag; | |
1790 | ||
1e4d1764 YQ |
1791 | /* Create a tracepoint (location) with given number and address. Add this |
1792 | new tracepoint to list and sort this list. */ | |
219f2f23 PA |
1793 | |
1794 | static struct tracepoint * | |
1795 | add_tracepoint (int num, CORE_ADDR addr) | |
1796 | { | |
1e4d1764 | 1797 | struct tracepoint *tpoint, **tp_next; |
219f2f23 | 1798 | |
8d749320 | 1799 | tpoint = XNEW (struct tracepoint); |
219f2f23 PA |
1800 | tpoint->number = num; |
1801 | tpoint->address = addr; | |
1802 | tpoint->numactions = 0; | |
1803 | tpoint->actions = NULL; | |
1804 | tpoint->actions_str = NULL; | |
1805 | tpoint->cond = NULL; | |
1806 | tpoint->num_step_actions = 0; | |
1807 | tpoint->step_actions = NULL; | |
1808 | tpoint->step_actions_str = NULL; | |
fa593d66 PA |
1809 | /* Start all off as regular (slow) tracepoints. */ |
1810 | tpoint->type = trap_tracepoint; | |
1811 | tpoint->orig_size = -1; | |
219f2f23 | 1812 | tpoint->source_strings = NULL; |
6a271cae | 1813 | tpoint->compiled_cond = 0; |
219f2f23 PA |
1814 | tpoint->handle = NULL; |
1815 | tpoint->next = NULL; | |
1816 | ||
1e4d1764 YQ |
1817 | /* Find a place to insert this tracepoint into list in order to keep |
1818 | the tracepoint list still in the ascending order. There may be | |
1819 | multiple tracepoints at the same address as TPOINT's, and this | |
1820 | guarantees TPOINT is inserted after all the tracepoints which are | |
1821 | set at the same address. For example, fast tracepoints A, B, C are | |
1822 | set at the same address, and D is to be insert at the same place as | |
1823 | well, | |
1824 | ||
1825 | -->| A |--> | B |-->| C |->... | |
1826 | ||
1827 | One jump pad was created for tracepoint A, B, and C, and the target | |
1828 | address of A is referenced/used in jump pad. So jump pad will let | |
1829 | inferior jump to A. If D is inserted in front of A, like this, | |
1830 | ||
1831 | -->| D |-->| A |--> | B |-->| C |->... | |
1832 | ||
1833 | without updating jump pad, D is not reachable during collect, which | |
1834 | is wrong. As we can see, the order of B, C and D doesn't matter, but | |
1835 | A should always be the `first' one. */ | |
1836 | for (tp_next = &tracepoints; | |
1837 | (*tp_next) != NULL && (*tp_next)->address <= tpoint->address; | |
1838 | tp_next = &(*tp_next)->next) | |
1839 | ; | |
1840 | tpoint->next = *tp_next; | |
1841 | *tp_next = tpoint; | |
219f2f23 PA |
1842 | last_tracepoint = tpoint; |
1843 | ||
1844 | seen_step_action_flag = 0; | |
1845 | ||
1846 | return tpoint; | |
1847 | } | |
1848 | ||
fa593d66 PA |
1849 | #ifndef IN_PROCESS_AGENT |
1850 | ||
219f2f23 PA |
1851 | /* Return the tracepoint with the given number and address, or NULL. */ |
1852 | ||
1853 | static struct tracepoint * | |
1854 | find_tracepoint (int id, CORE_ADDR addr) | |
1855 | { | |
1856 | struct tracepoint *tpoint; | |
1857 | ||
1858 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
1859 | if (tpoint->number == id && tpoint->address == addr) | |
1860 | return tpoint; | |
1861 | ||
1862 | return NULL; | |
1863 | } | |
1864 | ||
f4647387 YQ |
1865 | /* Remove TPOINT from global list. */ |
1866 | ||
1867 | static void | |
1868 | remove_tracepoint (struct tracepoint *tpoint) | |
1869 | { | |
1870 | struct tracepoint *tp, *tp_prev; | |
1871 | ||
1872 | for (tp = tracepoints, tp_prev = NULL; tp && tp != tpoint; | |
1873 | tp_prev = tp, tp = tp->next) | |
1874 | ; | |
1875 | ||
1876 | if (tp) | |
1877 | { | |
1878 | if (tp_prev) | |
1879 | tp_prev->next = tp->next; | |
1880 | else | |
1881 | tracepoints = tp->next; | |
1882 | ||
1883 | xfree (tp); | |
1884 | } | |
1885 | } | |
1886 | ||
219f2f23 PA |
1887 | /* There may be several tracepoints with the same number (because they |
1888 | are "locations", in GDB parlance); return the next one after the | |
1889 | given tracepoint, or search from the beginning of the list if the | |
1890 | first argument is NULL. */ | |
1891 | ||
1892 | static struct tracepoint * | |
1893 | find_next_tracepoint_by_number (struct tracepoint *prev_tp, int num) | |
1894 | { | |
1895 | struct tracepoint *tpoint; | |
1896 | ||
1897 | if (prev_tp) | |
1898 | tpoint = prev_tp->next; | |
1899 | else | |
1900 | tpoint = tracepoints; | |
1901 | for (; tpoint; tpoint = tpoint->next) | |
1902 | if (tpoint->number == num) | |
1903 | return tpoint; | |
1904 | ||
1905 | return NULL; | |
1906 | } | |
1907 | ||
fa593d66 PA |
1908 | #endif |
1909 | ||
219f2f23 PA |
1910 | /* Append another action to perform when the tracepoint triggers. */ |
1911 | ||
1912 | static void | |
1913 | add_tracepoint_action (struct tracepoint *tpoint, char *packet) | |
1914 | { | |
1915 | char *act; | |
1916 | ||
1917 | if (*packet == 'S') | |
1918 | { | |
1919 | seen_step_action_flag = 1; | |
1920 | ++packet; | |
1921 | } | |
1922 | ||
1923 | act = packet; | |
1924 | ||
1925 | while (*act) | |
1926 | { | |
1927 | char *act_start = act; | |
1928 | struct tracepoint_action *action = NULL; | |
1929 | ||
1930 | switch (*act) | |
1931 | { | |
1932 | case 'M': | |
1933 | { | |
8d749320 SM |
1934 | struct collect_memory_action *maction = |
1935 | XNEW (struct collect_memory_action); | |
219f2f23 PA |
1936 | ULONGEST basereg; |
1937 | int is_neg; | |
1938 | ||
219f2f23 PA |
1939 | maction->base.type = *act; |
1940 | action = &maction->base; | |
1941 | ||
1942 | ++act; | |
1943 | is_neg = (*act == '-'); | |
1944 | if (*act == '-') | |
1945 | ++act; | |
1946 | act = unpack_varlen_hex (act, &basereg); | |
1947 | ++act; | |
1948 | act = unpack_varlen_hex (act, &maction->addr); | |
1949 | ++act; | |
1950 | act = unpack_varlen_hex (act, &maction->len); | |
1951 | maction->basereg = (is_neg | |
1952 | ? - (int) basereg | |
1953 | : (int) basereg); | |
1954 | trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)", | |
1955 | pulongest (maction->len), | |
1956 | paddress (maction->addr), maction->basereg); | |
1957 | break; | |
1958 | } | |
1959 | case 'R': | |
1960 | { | |
8d749320 SM |
1961 | struct collect_registers_action *raction = |
1962 | XNEW (struct collect_registers_action); | |
219f2f23 | 1963 | |
219f2f23 PA |
1964 | raction->base.type = *act; |
1965 | action = &raction->base; | |
1966 | ||
1967 | trace_debug ("Want to collect registers"); | |
1968 | ++act; | |
1969 | /* skip past hex digits of mask for now */ | |
1970 | while (isxdigit(*act)) | |
1971 | ++act; | |
1972 | break; | |
1973 | } | |
0fb4aa4b PA |
1974 | case 'L': |
1975 | { | |
8d749320 SM |
1976 | struct collect_static_trace_data_action *raction = |
1977 | XNEW (struct collect_static_trace_data_action); | |
0fb4aa4b | 1978 | |
0fb4aa4b PA |
1979 | raction->base.type = *act; |
1980 | action = &raction->base; | |
1981 | ||
1982 | trace_debug ("Want to collect static trace data"); | |
1983 | ++act; | |
1984 | break; | |
1985 | } | |
219f2f23 PA |
1986 | case 'S': |
1987 | trace_debug ("Unexpected step action, ignoring"); | |
1988 | ++act; | |
1989 | break; | |
1990 | case 'X': | |
1991 | { | |
8d749320 | 1992 | struct eval_expr_action *xaction = XNEW (struct eval_expr_action); |
219f2f23 | 1993 | |
219f2f23 PA |
1994 | xaction->base.type = *act; |
1995 | action = &xaction->base; | |
1996 | ||
1997 | trace_debug ("Want to evaluate expression"); | |
5e1dc496 | 1998 | xaction->expr = gdb_parse_agent_expr (&act); |
219f2f23 PA |
1999 | break; |
2000 | } | |
2001 | default: | |
2002 | trace_debug ("unknown trace action '%c', ignoring...", *act); | |
2003 | break; | |
2004 | case '-': | |
2005 | break; | |
2006 | } | |
2007 | ||
2008 | if (action == NULL) | |
2009 | break; | |
2010 | ||
2011 | if (seen_step_action_flag) | |
2012 | { | |
2013 | tpoint->num_step_actions++; | |
2014 | ||
2015 | tpoint->step_actions | |
224c3ddb SM |
2016 | = XRESIZEVEC (struct tracepoint_action *, tpoint->step_actions, |
2017 | tpoint->num_step_actions); | |
219f2f23 | 2018 | tpoint->step_actions_str |
224c3ddb SM |
2019 | = XRESIZEVEC (char *, tpoint->step_actions_str, |
2020 | tpoint->num_step_actions); | |
219f2f23 PA |
2021 | tpoint->step_actions[tpoint->num_step_actions - 1] = action; |
2022 | tpoint->step_actions_str[tpoint->num_step_actions - 1] | |
baea0dae | 2023 | = savestring (act_start, act - act_start); |
219f2f23 PA |
2024 | } |
2025 | else | |
2026 | { | |
2027 | tpoint->numactions++; | |
2028 | tpoint->actions | |
224c3ddb SM |
2029 | = XRESIZEVEC (struct tracepoint_action *, tpoint->actions, |
2030 | tpoint->numactions); | |
219f2f23 | 2031 | tpoint->actions_str |
224c3ddb | 2032 | = XRESIZEVEC (char *, tpoint->actions_str, tpoint->numactions); |
219f2f23 PA |
2033 | tpoint->actions[tpoint->numactions - 1] = action; |
2034 | tpoint->actions_str[tpoint->numactions - 1] | |
baea0dae | 2035 | = savestring (act_start, act - act_start); |
219f2f23 PA |
2036 | } |
2037 | } | |
2038 | } | |
2039 | ||
fa593d66 PA |
2040 | #endif |
2041 | ||
219f2f23 PA |
2042 | /* Find or create a trace state variable with the given number. */ |
2043 | ||
2044 | static struct trace_state_variable * | |
2045 | get_trace_state_variable (int num) | |
2046 | { | |
2047 | struct trace_state_variable *tsv; | |
2048 | ||
fa593d66 PA |
2049 | #ifdef IN_PROCESS_AGENT |
2050 | /* Search for an existing variable. */ | |
2051 | for (tsv = alloced_trace_state_variables; tsv; tsv = tsv->next) | |
2052 | if (tsv->number == num) | |
2053 | return tsv; | |
2054 | #endif | |
2055 | ||
219f2f23 PA |
2056 | /* Search for an existing variable. */ |
2057 | for (tsv = trace_state_variables; tsv; tsv = tsv->next) | |
2058 | if (tsv->number == num) | |
2059 | return tsv; | |
2060 | ||
2061 | return NULL; | |
2062 | } | |
2063 | ||
2064 | /* Find or create a trace state variable with the given number. */ | |
2065 | ||
2066 | static struct trace_state_variable * | |
fa593d66 | 2067 | create_trace_state_variable (int num, int gdb) |
219f2f23 PA |
2068 | { |
2069 | struct trace_state_variable *tsv; | |
2070 | ||
2071 | tsv = get_trace_state_variable (num); | |
2072 | if (tsv != NULL) | |
2073 | return tsv; | |
2074 | ||
2075 | /* Create a new variable. */ | |
8d749320 | 2076 | tsv = XNEW (struct trace_state_variable); |
219f2f23 PA |
2077 | tsv->number = num; |
2078 | tsv->initial_value = 0; | |
2079 | tsv->value = 0; | |
2080 | tsv->getter = NULL; | |
2081 | tsv->name = NULL; | |
fa593d66 PA |
2082 | #ifdef IN_PROCESS_AGENT |
2083 | if (!gdb) | |
2084 | { | |
2085 | tsv->next = alloced_trace_state_variables; | |
2086 | alloced_trace_state_variables = tsv; | |
2087 | } | |
2088 | else | |
2089 | #endif | |
2090 | { | |
2091 | tsv->next = trace_state_variables; | |
2092 | trace_state_variables = tsv; | |
2093 | } | |
219f2f23 PA |
2094 | return tsv; |
2095 | } | |
2096 | ||
3c14e5a3 | 2097 | IP_AGENT_EXPORT_FUNC LONGEST |
219f2f23 PA |
2098 | get_trace_state_variable_value (int num) |
2099 | { | |
2100 | struct trace_state_variable *tsv; | |
2101 | ||
2102 | tsv = get_trace_state_variable (num); | |
2103 | ||
2104 | if (!tsv) | |
2105 | { | |
2106 | trace_debug ("No trace state variable %d, skipping value get", num); | |
2107 | return 0; | |
2108 | } | |
2109 | ||
2110 | /* Call a getter function if we have one. While it's tempting to | |
2111 | set up something to only call the getter once per tracepoint hit, | |
2112 | it could run afoul of thread races. Better to let the getter | |
2113 | handle it directly, if necessary to worry about it. */ | |
2114 | if (tsv->getter) | |
2115 | tsv->value = (tsv->getter) (); | |
2116 | ||
2117 | trace_debug ("get_trace_state_variable_value(%d) ==> %s", | |
2118 | num, plongest (tsv->value)); | |
2119 | ||
2120 | return tsv->value; | |
2121 | } | |
2122 | ||
3c14e5a3 | 2123 | IP_AGENT_EXPORT_FUNC void |
219f2f23 PA |
2124 | set_trace_state_variable_value (int num, LONGEST val) |
2125 | { | |
2126 | struct trace_state_variable *tsv; | |
2127 | ||
2128 | tsv = get_trace_state_variable (num); | |
2129 | ||
2130 | if (!tsv) | |
2131 | { | |
2132 | trace_debug ("No trace state variable %d, skipping value set", num); | |
2133 | return; | |
2134 | } | |
2135 | ||
2136 | tsv->value = val; | |
2137 | } | |
2138 | ||
5e1dc496 LM |
2139 | LONGEST |
2140 | agent_get_trace_state_variable_value (int num) | |
2141 | { | |
2142 | return get_trace_state_variable_value (num); | |
2143 | } | |
2144 | ||
2145 | void | |
2146 | agent_set_trace_state_variable_value (int num, LONGEST val) | |
2147 | { | |
2148 | set_trace_state_variable_value (num, val); | |
2149 | } | |
2150 | ||
219f2f23 PA |
2151 | static void |
2152 | set_trace_state_variable_name (int num, const char *name) | |
2153 | { | |
2154 | struct trace_state_variable *tsv; | |
2155 | ||
2156 | tsv = get_trace_state_variable (num); | |
2157 | ||
2158 | if (!tsv) | |
2159 | { | |
2160 | trace_debug ("No trace state variable %d, skipping name set", num); | |
2161 | return; | |
2162 | } | |
2163 | ||
2164 | tsv->name = (char *) name; | |
2165 | } | |
2166 | ||
2167 | static void | |
2168 | set_trace_state_variable_getter (int num, LONGEST (*getter) (void)) | |
2169 | { | |
2170 | struct trace_state_variable *tsv; | |
2171 | ||
2172 | tsv = get_trace_state_variable (num); | |
2173 | ||
2174 | if (!tsv) | |
2175 | { | |
2176 | trace_debug ("No trace state variable %d, skipping getter set", num); | |
2177 | return; | |
2178 | } | |
2179 | ||
2180 | tsv->getter = getter; | |
2181 | } | |
2182 | ||
2183 | /* Add a raw traceframe for the given tracepoint. */ | |
2184 | ||
2185 | static struct traceframe * | |
2186 | add_traceframe (struct tracepoint *tpoint) | |
2187 | { | |
2188 | struct traceframe *tframe; | |
2189 | ||
224c3ddb SM |
2190 | tframe |
2191 | = (struct traceframe *) trace_buffer_alloc (sizeof (struct traceframe)); | |
219f2f23 PA |
2192 | |
2193 | if (tframe == NULL) | |
2194 | return NULL; | |
2195 | ||
2196 | tframe->tpnum = tpoint->number; | |
2197 | tframe->data_size = 0; | |
2198 | ||
2199 | return tframe; | |
2200 | } | |
2201 | ||
2202 | /* Add a block to the traceframe currently being worked on. */ | |
2203 | ||
2204 | static unsigned char * | |
5ae4861a YQ |
2205 | add_traceframe_block (struct traceframe *tframe, |
2206 | struct tracepoint *tpoint, int amt) | |
219f2f23 PA |
2207 | { |
2208 | unsigned char *block; | |
2209 | ||
2210 | if (!tframe) | |
2211 | return NULL; | |
2212 | ||
224c3ddb | 2213 | block = (unsigned char *) trace_buffer_alloc (amt); |
219f2f23 PA |
2214 | |
2215 | if (!block) | |
2216 | return NULL; | |
2217 | ||
5ae4861a YQ |
2218 | gdb_assert (tframe->tpnum == tpoint->number); |
2219 | ||
219f2f23 | 2220 | tframe->data_size += amt; |
5ae4861a | 2221 | tpoint->traceframe_usage += amt; |
219f2f23 PA |
2222 | |
2223 | return block; | |
2224 | } | |
2225 | ||
2226 | /* Flag that the current traceframe is finished. */ | |
2227 | ||
2228 | static void | |
2229 | finish_traceframe (struct traceframe *tframe) | |
2230 | { | |
2231 | ++traceframe_write_count; | |
2232 | ++traceframes_created; | |
2233 | } | |
2234 | ||
fa593d66 PA |
2235 | #ifndef IN_PROCESS_AGENT |
2236 | ||
219f2f23 PA |
2237 | /* Given a traceframe number NUM, find the NUMth traceframe in the |
2238 | buffer. */ | |
2239 | ||
2240 | static struct traceframe * | |
2241 | find_traceframe (int num) | |
2242 | { | |
2243 | struct traceframe *tframe; | |
2244 | int tfnum = 0; | |
2245 | ||
2246 | for (tframe = FIRST_TRACEFRAME (); | |
2247 | tframe->tpnum != 0; | |
2248 | tframe = NEXT_TRACEFRAME (tframe)) | |
2249 | { | |
2250 | if (tfnum == num) | |
2251 | return tframe; | |
2252 | ++tfnum; | |
2253 | } | |
2254 | ||
2255 | return NULL; | |
2256 | } | |
2257 | ||
2258 | static CORE_ADDR | |
2259 | get_traceframe_address (struct traceframe *tframe) | |
2260 | { | |
2261 | CORE_ADDR addr; | |
2262 | struct tracepoint *tpoint; | |
2263 | ||
2264 | addr = traceframe_get_pc (tframe); | |
2265 | ||
2266 | if (addr) | |
2267 | return addr; | |
2268 | ||
2269 | /* Fallback strategy, will be incorrect for while-stepping frames | |
2270 | and multi-location tracepoints. */ | |
2271 | tpoint = find_next_tracepoint_by_number (NULL, tframe->tpnum); | |
2272 | return tpoint->address; | |
2273 | } | |
2274 | ||
2275 | /* Search for the next traceframe whose address is inside or outside | |
2276 | the given range. */ | |
2277 | ||
2278 | static struct traceframe * | |
2279 | find_next_traceframe_in_range (CORE_ADDR lo, CORE_ADDR hi, int inside_p, | |
2280 | int *tfnump) | |
2281 | { | |
2282 | struct traceframe *tframe; | |
2283 | CORE_ADDR tfaddr; | |
2284 | ||
2285 | *tfnump = current_traceframe + 1; | |
2286 | tframe = find_traceframe (*tfnump); | |
2287 | /* The search is not supposed to wrap around. */ | |
2288 | if (!tframe) | |
2289 | { | |
2290 | *tfnump = -1; | |
2291 | return NULL; | |
2292 | } | |
2293 | ||
2294 | for (; tframe->tpnum != 0; tframe = NEXT_TRACEFRAME (tframe)) | |
2295 | { | |
2296 | tfaddr = get_traceframe_address (tframe); | |
2297 | if (inside_p | |
2298 | ? (lo <= tfaddr && tfaddr <= hi) | |
2299 | : (lo > tfaddr || tfaddr > hi)) | |
2300 | return tframe; | |
2301 | ++*tfnump; | |
2302 | } | |
2303 | ||
2304 | *tfnump = -1; | |
2305 | return NULL; | |
2306 | } | |
2307 | ||
2308 | /* Search for the next traceframe recorded by the given tracepoint. | |
2309 | Note that for multi-location tracepoints, this will find whatever | |
2310 | location appears first. */ | |
2311 | ||
2312 | static struct traceframe * | |
2313 | find_next_traceframe_by_tracepoint (int num, int *tfnump) | |
2314 | { | |
2315 | struct traceframe *tframe; | |
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 | if (tframe->tpnum == num) | |
2329 | return tframe; | |
2330 | ++*tfnump; | |
2331 | } | |
2332 | ||
2333 | *tfnump = -1; | |
2334 | return NULL; | |
2335 | } | |
2336 | ||
fa593d66 PA |
2337 | #endif |
2338 | ||
2339 | #ifndef IN_PROCESS_AGENT | |
2340 | ||
219f2f23 PA |
2341 | /* Clear all past trace state. */ |
2342 | ||
2343 | static void | |
2344 | cmd_qtinit (char *packet) | |
2345 | { | |
2346 | struct trace_state_variable *tsv, *prev, *next; | |
2347 | ||
b05ec7a5 AT |
2348 | /* Can't do this command without a pid attached. */ |
2349 | if (current_thread == NULL) | |
2350 | { | |
2351 | write_enn (packet); | |
2352 | return; | |
2353 | } | |
2354 | ||
219f2f23 PA |
2355 | /* Make sure we don't try to read from a trace frame. */ |
2356 | current_traceframe = -1; | |
2357 | ||
1ebff1fd HAQ |
2358 | stop_tracing (); |
2359 | ||
219f2f23 PA |
2360 | trace_debug ("Initializing the trace"); |
2361 | ||
2362 | clear_installed_tracepoints (); | |
2363 | clear_readonly_regions (); | |
2364 | ||
2365 | tracepoints = NULL; | |
2366 | last_tracepoint = NULL; | |
2367 | ||
2368 | /* Clear out any leftover trace state variables. Ones with target | |
2369 | defined getters should be kept however. */ | |
2370 | prev = NULL; | |
2371 | tsv = trace_state_variables; | |
2372 | while (tsv) | |
2373 | { | |
2374 | trace_debug ("Looking at var %d", tsv->number); | |
2375 | if (tsv->getter == NULL) | |
2376 | { | |
2377 | next = tsv->next; | |
2378 | if (prev) | |
2379 | prev->next = next; | |
2380 | else | |
2381 | trace_state_variables = next; | |
2382 | trace_debug ("Deleting var %d", tsv->number); | |
2383 | free (tsv); | |
2384 | tsv = next; | |
2385 | } | |
2386 | else | |
2387 | { | |
2388 | prev = tsv; | |
2389 | tsv = tsv->next; | |
2390 | } | |
2391 | } | |
2392 | ||
2393 | clear_trace_buffer (); | |
fa593d66 | 2394 | clear_inferior_trace_buffer (); |
219f2f23 PA |
2395 | |
2396 | write_ok (packet); | |
2397 | } | |
2398 | ||
0fb4aa4b PA |
2399 | /* Unprobe the UST marker at ADDRESS. */ |
2400 | ||
2401 | static void | |
2402 | unprobe_marker_at (CORE_ADDR address) | |
2403 | { | |
2fa291ac | 2404 | char cmd[IPA_CMD_BUF_SIZE]; |
0fb4aa4b PA |
2405 | |
2406 | sprintf (cmd, "unprobe_marker_at:%s", paddress (address)); | |
42476b70 | 2407 | run_inferior_command (cmd, strlen (cmd) + 1); |
0fb4aa4b PA |
2408 | } |
2409 | ||
219f2f23 PA |
2410 | /* Restore the program to its pre-tracing state. This routine may be called |
2411 | in error situations, so it needs to be careful about only restoring | |
2412 | from known-valid bits. */ | |
2413 | ||
2414 | static void | |
2415 | clear_installed_tracepoints (void) | |
2416 | { | |
2417 | struct tracepoint *tpoint; | |
2418 | struct tracepoint *prev_stpoint; | |
2419 | ||
7984d532 | 2420 | pause_all (1); |
7984d532 | 2421 | |
219f2f23 PA |
2422 | prev_stpoint = NULL; |
2423 | ||
2424 | /* Restore any bytes overwritten by tracepoints. */ | |
2425 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
2426 | { | |
219f2f23 PA |
2427 | /* Catch the case where we might try to remove a tracepoint that |
2428 | was never actually installed. */ | |
2429 | if (tpoint->handle == NULL) | |
2430 | { | |
2431 | trace_debug ("Tracepoint %d at 0x%s was " | |
2432 | "never installed, nothing to clear", | |
2433 | tpoint->number, paddress (tpoint->address)); | |
2434 | continue; | |
2435 | } | |
2436 | ||
fa593d66 PA |
2437 | switch (tpoint->type) |
2438 | { | |
2439 | case trap_tracepoint: | |
c17414a2 PA |
2440 | { |
2441 | struct breakpoint *bp | |
2442 | = (struct breakpoint *) tpoint->handle; | |
2443 | ||
2444 | delete_breakpoint (bp); | |
2445 | } | |
fa593d66 PA |
2446 | break; |
2447 | case fast_tracepoint: | |
c17414a2 PA |
2448 | { |
2449 | struct fast_tracepoint_jump *jump | |
2450 | = (struct fast_tracepoint_jump *) tpoint->handle; | |
2451 | ||
2452 | delete_fast_tracepoint_jump (jump); | |
2453 | } | |
fa593d66 | 2454 | break; |
0fb4aa4b PA |
2455 | case static_tracepoint: |
2456 | if (prev_stpoint != NULL | |
2457 | && prev_stpoint->address == tpoint->address) | |
2458 | /* Nothing to do. We already unprobed a tracepoint set at | |
2459 | this marker address (and there can only be one probe | |
2460 | per marker). */ | |
2461 | ; | |
2462 | else | |
2463 | { | |
2464 | unprobe_marker_at (tpoint->address); | |
2465 | prev_stpoint = tpoint; | |
2466 | } | |
2467 | break; | |
fa593d66 PA |
2468 | } |
2469 | ||
219f2f23 PA |
2470 | tpoint->handle = NULL; |
2471 | } | |
7984d532 PA |
2472 | |
2473 | unpause_all (1); | |
219f2f23 PA |
2474 | } |
2475 | ||
2476 | /* Parse a packet that defines a tracepoint. */ | |
2477 | ||
2478 | static void | |
2479 | cmd_qtdp (char *own_buf) | |
2480 | { | |
2481 | int tppacket; | |
1e4d1764 YQ |
2482 | /* Whether there is a trailing hyphen at the end of the QTDP packet. */ |
2483 | int trail_hyphen = 0; | |
219f2f23 PA |
2484 | ULONGEST num; |
2485 | ULONGEST addr; | |
2486 | ULONGEST count; | |
2487 | struct tracepoint *tpoint; | |
2488 | char *actparm; | |
2489 | char *packet = own_buf; | |
2490 | ||
2491 | packet += strlen ("QTDP:"); | |
2492 | ||
2493 | /* A hyphen at the beginning marks a packet specifying actions for a | |
2494 | tracepoint already supplied. */ | |
2495 | tppacket = 1; | |
2496 | if (*packet == '-') | |
2497 | { | |
2498 | tppacket = 0; | |
2499 | ++packet; | |
2500 | } | |
2501 | packet = unpack_varlen_hex (packet, &num); | |
2502 | ++packet; /* skip a colon */ | |
2503 | packet = unpack_varlen_hex (packet, &addr); | |
2504 | ++packet; /* skip a colon */ | |
2505 | ||
2506 | /* See if we already have this tracepoint. */ | |
2507 | tpoint = find_tracepoint (num, addr); | |
2508 | ||
2509 | if (tppacket) | |
2510 | { | |
2511 | /* Duplicate tracepoints are never allowed. */ | |
2512 | if (tpoint) | |
2513 | { | |
2514 | trace_debug ("Tracepoint error: tracepoint %d" | |
2515 | " at 0x%s already exists", | |
2516 | (int) num, paddress (addr)); | |
2517 | write_enn (own_buf); | |
2518 | return; | |
2519 | } | |
2520 | ||
2521 | tpoint = add_tracepoint (num, addr); | |
2522 | ||
2523 | tpoint->enabled = (*packet == 'E'); | |
2524 | ++packet; /* skip 'E' */ | |
2525 | ++packet; /* skip a colon */ | |
2526 | packet = unpack_varlen_hex (packet, &count); | |
2527 | tpoint->step_count = count; | |
2528 | ++packet; /* skip a colon */ | |
2529 | packet = unpack_varlen_hex (packet, &count); | |
2530 | tpoint->pass_count = count; | |
2531 | /* See if we have any of the additional optional fields. */ | |
2532 | while (*packet == ':') | |
2533 | { | |
2534 | ++packet; | |
fa593d66 PA |
2535 | if (*packet == 'F') |
2536 | { | |
2537 | tpoint->type = fast_tracepoint; | |
2538 | ++packet; | |
2539 | packet = unpack_varlen_hex (packet, &count); | |
2540 | tpoint->orig_size = count; | |
2541 | } | |
0fb4aa4b PA |
2542 | else if (*packet == 'S') |
2543 | { | |
2544 | tpoint->type = static_tracepoint; | |
2545 | ++packet; | |
2546 | } | |
fa593d66 | 2547 | else if (*packet == 'X') |
219f2f23 PA |
2548 | { |
2549 | actparm = (char *) packet; | |
5e1dc496 | 2550 | tpoint->cond = gdb_parse_agent_expr (&actparm); |
219f2f23 PA |
2551 | packet = actparm; |
2552 | } | |
2553 | else if (*packet == '-') | |
2554 | break; | |
2555 | else if (*packet == '\0') | |
2556 | break; | |
2557 | else | |
2558 | trace_debug ("Unknown optional tracepoint field"); | |
2559 | } | |
2560 | if (*packet == '-') | |
1e4d1764 YQ |
2561 | { |
2562 | trail_hyphen = 1; | |
2563 | trace_debug ("Also has actions\n"); | |
2564 | } | |
219f2f23 | 2565 | |
fa593d66 | 2566 | trace_debug ("Defined %stracepoint %d at 0x%s, " |
5f18041e | 2567 | "enabled %d step %" PRIu64 " pass %" PRIu64, |
fa593d66 | 2568 | tpoint->type == fast_tracepoint ? "fast " |
5e0a92a9 | 2569 | : tpoint->type == static_tracepoint ? "static " : "", |
fa593d66 | 2570 | tpoint->number, paddress (tpoint->address), tpoint->enabled, |
219f2f23 PA |
2571 | tpoint->step_count, tpoint->pass_count); |
2572 | } | |
2573 | else if (tpoint) | |
2574 | add_tracepoint_action (tpoint, packet); | |
2575 | else | |
2576 | { | |
2577 | trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found", | |
2578 | (int) num, paddress (addr)); | |
2579 | write_enn (own_buf); | |
2580 | return; | |
2581 | } | |
2582 | ||
1e4d1764 YQ |
2583 | /* Install tracepoint during tracing only once for each tracepoint location. |
2584 | For each tracepoint loc, GDB may send multiple QTDP packets, and we can | |
2585 | determine the last QTDP packet for one tracepoint location by checking | |
2586 | trailing hyphen in QTDP packet. */ | |
2587 | if (tracing && !trail_hyphen) | |
2588 | { | |
fc3e5175 YQ |
2589 | struct tracepoint *tp = NULL; |
2590 | ||
1e4d1764 YQ |
2591 | /* Pause all threads temporarily while we patch tracepoints. */ |
2592 | pause_all (0); | |
2593 | ||
2594 | /* download_tracepoint will update global `tracepoints' | |
2595 | list, so it is unsafe to leave threads in jump pad. */ | |
2596 | stabilize_threads (); | |
2597 | ||
2598 | /* Freeze threads. */ | |
2599 | pause_all (1); | |
2600 | ||
fc3e5175 YQ |
2601 | |
2602 | if (tpoint->type != trap_tracepoint) | |
2603 | { | |
2604 | /* Find another fast or static tracepoint at the same address. */ | |
2605 | for (tp = tracepoints; tp; tp = tp->next) | |
2606 | { | |
2607 | if (tp->address == tpoint->address && tp->type == tpoint->type | |
2608 | && tp->number != tpoint->number) | |
2609 | break; | |
2610 | } | |
2611 | ||
2612 | /* TPOINT is installed at the same address as TP. */ | |
2613 | if (tp) | |
2614 | { | |
2615 | if (tpoint->type == fast_tracepoint) | |
2616 | clone_fast_tracepoint (tpoint, tp); | |
2617 | else if (tpoint->type == static_tracepoint) | |
2618 | tpoint->handle = (void *) -1; | |
2619 | } | |
2620 | } | |
2621 | ||
42476b70 YQ |
2622 | if (use_agent && tpoint->type == fast_tracepoint |
2623 | && agent_capability_check (AGENT_CAPA_FAST_TRACE)) | |
fc3e5175 | 2624 | { |
42476b70 YQ |
2625 | /* Download and install fast tracepoint by agent. */ |
2626 | if (tracepoint_send_agent (tpoint) == 0) | |
2627 | write_ok (own_buf); | |
2628 | else | |
2629 | { | |
2630 | write_enn (own_buf); | |
2631 | remove_tracepoint (tpoint); | |
2632 | } | |
fc3e5175 YQ |
2633 | } |
2634 | else | |
42476b70 YQ |
2635 | { |
2636 | download_tracepoint (tpoint); | |
2637 | ||
2638 | if (tpoint->type == trap_tracepoint || tp == NULL) | |
2639 | { | |
2640 | install_tracepoint (tpoint, own_buf); | |
2641 | if (strcmp (own_buf, "OK") != 0) | |
2642 | remove_tracepoint (tpoint); | |
2643 | } | |
2644 | else | |
2645 | write_ok (own_buf); | |
2646 | } | |
1e4d1764 YQ |
2647 | |
2648 | unpause_all (1); | |
2649 | return; | |
2650 | } | |
2651 | ||
219f2f23 PA |
2652 | write_ok (own_buf); |
2653 | } | |
2654 | ||
2655 | static void | |
2656 | cmd_qtdpsrc (char *own_buf) | |
2657 | { | |
2658 | ULONGEST num, addr, start, slen; | |
2659 | struct tracepoint *tpoint; | |
2660 | char *packet = own_buf; | |
2661 | char *saved, *srctype, *src; | |
2662 | size_t nbytes; | |
2663 | struct source_string *last, *newlast; | |
2664 | ||
2665 | packet += strlen ("QTDPsrc:"); | |
2666 | ||
2667 | packet = unpack_varlen_hex (packet, &num); | |
2668 | ++packet; /* skip a colon */ | |
2669 | packet = unpack_varlen_hex (packet, &addr); | |
2670 | ++packet; /* skip a colon */ | |
2671 | ||
2672 | /* See if we already have this tracepoint. */ | |
2673 | tpoint = find_tracepoint (num, addr); | |
2674 | ||
2675 | if (!tpoint) | |
2676 | { | |
2677 | trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found", | |
2678 | (int) num, paddress (addr)); | |
2679 | write_enn (own_buf); | |
2680 | return; | |
2681 | } | |
2682 | ||
2683 | saved = packet; | |
2684 | packet = strchr (packet, ':'); | |
224c3ddb | 2685 | srctype = (char *) xmalloc (packet - saved + 1); |
219f2f23 PA |
2686 | memcpy (srctype, saved, packet - saved); |
2687 | srctype[packet - saved] = '\0'; | |
2688 | ++packet; | |
2689 | packet = unpack_varlen_hex (packet, &start); | |
2690 | ++packet; /* skip a colon */ | |
2691 | packet = unpack_varlen_hex (packet, &slen); | |
2692 | ++packet; /* skip a colon */ | |
224c3ddb | 2693 | src = (char *) xmalloc (slen + 1); |
ff0e980e | 2694 | nbytes = hex2bin (packet, (gdb_byte *) src, strlen (packet) / 2); |
219f2f23 PA |
2695 | src[nbytes] = '\0'; |
2696 | ||
8d749320 | 2697 | newlast = XNEW (struct source_string); |
219f2f23 PA |
2698 | newlast->type = srctype; |
2699 | newlast->str = src; | |
2700 | newlast->next = NULL; | |
2701 | /* Always add a source string to the end of the list; | |
2702 | this keeps sequences of actions/commands in the right | |
2703 | order. */ | |
2704 | if (tpoint->source_strings) | |
2705 | { | |
2706 | for (last = tpoint->source_strings; last->next; last = last->next) | |
2707 | ; | |
2708 | last->next = newlast; | |
2709 | } | |
2710 | else | |
2711 | tpoint->source_strings = newlast; | |
2712 | ||
2713 | write_ok (own_buf); | |
2714 | } | |
2715 | ||
2716 | static void | |
2717 | cmd_qtdv (char *own_buf) | |
2718 | { | |
2719 | ULONGEST num, val, builtin; | |
2720 | char *varname; | |
2721 | size_t nbytes; | |
2722 | struct trace_state_variable *tsv; | |
2723 | char *packet = own_buf; | |
2724 | ||
2725 | packet += strlen ("QTDV:"); | |
2726 | ||
2727 | packet = unpack_varlen_hex (packet, &num); | |
2728 | ++packet; /* skip a colon */ | |
2729 | packet = unpack_varlen_hex (packet, &val); | |
2730 | ++packet; /* skip a colon */ | |
2731 | packet = unpack_varlen_hex (packet, &builtin); | |
2732 | ++packet; /* skip a colon */ | |
2733 | ||
2734 | nbytes = strlen (packet) / 2; | |
224c3ddb | 2735 | varname = (char *) xmalloc (nbytes + 1); |
ff0e980e | 2736 | nbytes = hex2bin (packet, (gdb_byte *) varname, nbytes); |
219f2f23 PA |
2737 | varname[nbytes] = '\0'; |
2738 | ||
fa593d66 | 2739 | tsv = create_trace_state_variable (num, 1); |
219f2f23 PA |
2740 | tsv->initial_value = (LONGEST) val; |
2741 | tsv->name = varname; | |
2742 | ||
2743 | set_trace_state_variable_value (num, (LONGEST) val); | |
2744 | ||
2745 | write_ok (own_buf); | |
2746 | } | |
2747 | ||
d248b706 KY |
2748 | static void |
2749 | cmd_qtenable_disable (char *own_buf, int enable) | |
2750 | { | |
2751 | char *packet = own_buf; | |
2752 | ULONGEST num, addr; | |
2753 | struct tracepoint *tp; | |
2754 | ||
2755 | packet += strlen (enable ? "QTEnable:" : "QTDisable:"); | |
2756 | packet = unpack_varlen_hex (packet, &num); | |
2757 | ++packet; /* skip a colon */ | |
2758 | packet = unpack_varlen_hex (packet, &addr); | |
2759 | ||
2760 | tp = find_tracepoint (num, addr); | |
2761 | ||
2762 | if (tp) | |
2763 | { | |
2764 | if ((enable && tp->enabled) || (!enable && !tp->enabled)) | |
2765 | { | |
2766 | trace_debug ("Tracepoint %d at 0x%s is already %s", | |
2767 | (int) num, paddress (addr), | |
2768 | enable ? "enabled" : "disabled"); | |
2769 | write_ok (own_buf); | |
2770 | return; | |
2771 | } | |
2772 | ||
2773 | trace_debug ("%s tracepoint %d at 0x%s", | |
2774 | enable ? "Enabling" : "Disabling", | |
2775 | (int) num, paddress (addr)); | |
2776 | ||
2777 | tp->enabled = enable; | |
2778 | ||
2779 | if (tp->type == fast_tracepoint || tp->type == static_tracepoint) | |
2780 | { | |
2781 | int ret; | |
2782 | int offset = offsetof (struct tracepoint, enabled); | |
2783 | CORE_ADDR obj_addr = tp->obj_addr_on_target + offset; | |
2784 | ||
2785 | ret = prepare_to_access_memory (); | |
2786 | if (ret) | |
2787 | { | |
2788 | trace_debug ("Failed to temporarily stop inferior threads"); | |
2789 | write_enn (own_buf); | |
2790 | return; | |
2791 | } | |
72fb5488 | 2792 | |
35fd2deb | 2793 | ret = write_inferior_int8 (obj_addr, enable); |
d248b706 KY |
2794 | done_accessing_memory (); |
2795 | ||
2796 | if (ret) | |
2797 | { | |
2798 | trace_debug ("Cannot write enabled flag into " | |
2799 | "inferior process memory"); | |
2800 | write_enn (own_buf); | |
2801 | return; | |
2802 | } | |
2803 | } | |
2804 | ||
2805 | write_ok (own_buf); | |
2806 | } | |
2807 | else | |
2808 | { | |
2809 | trace_debug ("Tracepoint %d at 0x%s not found", | |
2810 | (int) num, paddress (addr)); | |
2811 | write_enn (own_buf); | |
2812 | } | |
2813 | } | |
2814 | ||
219f2f23 PA |
2815 | static void |
2816 | cmd_qtv (char *own_buf) | |
2817 | { | |
2818 | ULONGEST num; | |
eeb56fa7 | 2819 | LONGEST val = 0; |
219f2f23 PA |
2820 | int err; |
2821 | char *packet = own_buf; | |
2822 | ||
2823 | packet += strlen ("qTV:"); | |
f8f67713 | 2824 | unpack_varlen_hex (packet, &num); |
219f2f23 PA |
2825 | |
2826 | if (current_traceframe >= 0) | |
2827 | { | |
2828 | err = traceframe_read_tsv ((int) num, &val); | |
2829 | if (err) | |
2830 | { | |
2831 | strcpy (own_buf, "U"); | |
2832 | return; | |
2833 | } | |
2834 | } | |
2835 | /* Only make tsv's be undefined before the first trace run. After a | |
2836 | trace run is over, the user might want to see the last value of | |
2837 | the tsv, and it might not be available in a traceframe. */ | |
2838 | else if (!tracing && strcmp (tracing_stop_reason, "tnotrun") == 0) | |
2839 | { | |
2840 | strcpy (own_buf, "U"); | |
2841 | return; | |
2842 | } | |
2843 | else | |
2844 | val = get_trace_state_variable_value (num); | |
2845 | ||
2846 | sprintf (own_buf, "V%s", phex_nz (val, 0)); | |
2847 | } | |
2848 | ||
2849 | /* Clear out the list of readonly regions. */ | |
2850 | ||
2851 | static void | |
2852 | clear_readonly_regions (void) | |
2853 | { | |
2854 | struct readonly_region *roreg; | |
2855 | ||
2856 | while (readonly_regions) | |
2857 | { | |
2858 | roreg = readonly_regions; | |
2859 | readonly_regions = readonly_regions->next; | |
2860 | free (roreg); | |
2861 | } | |
2862 | } | |
2863 | ||
2864 | /* Parse the collection of address ranges whose contents GDB believes | |
2865 | to be unchanging and so can be read directly from target memory | |
2866 | even while looking at a traceframe. */ | |
2867 | ||
2868 | static void | |
2869 | cmd_qtro (char *own_buf) | |
2870 | { | |
2871 | ULONGEST start, end; | |
2872 | struct readonly_region *roreg; | |
2873 | char *packet = own_buf; | |
2874 | ||
2875 | trace_debug ("Want to mark readonly regions"); | |
2876 | ||
2877 | clear_readonly_regions (); | |
2878 | ||
2879 | packet += strlen ("QTro"); | |
2880 | ||
2881 | while (*packet == ':') | |
2882 | { | |
2883 | ++packet; /* skip a colon */ | |
2884 | packet = unpack_varlen_hex (packet, &start); | |
2885 | ++packet; /* skip a comma */ | |
2886 | packet = unpack_varlen_hex (packet, &end); | |
8d749320 SM |
2887 | |
2888 | roreg = XNEW (struct readonly_region); | |
219f2f23 PA |
2889 | roreg->start = start; |
2890 | roreg->end = end; | |
2891 | roreg->next = readonly_regions; | |
2892 | readonly_regions = roreg; | |
2893 | trace_debug ("Added readonly region from 0x%s to 0x%s", | |
2894 | paddress (roreg->start), paddress (roreg->end)); | |
2895 | } | |
2896 | ||
2897 | write_ok (own_buf); | |
2898 | } | |
2899 | ||
2900 | /* Test to see if the given range is in our list of readonly ranges. | |
2901 | We only test for being entirely within a range, GDB is not going to | |
2902 | send a single memory packet that spans multiple regions. */ | |
2903 | ||
2904 | int | |
2905 | in_readonly_region (CORE_ADDR addr, ULONGEST length) | |
2906 | { | |
2907 | struct readonly_region *roreg; | |
2908 | ||
2909 | for (roreg = readonly_regions; roreg; roreg = roreg->next) | |
2910 | if (roreg->start <= addr && (addr + length - 1) <= roreg->end) | |
2911 | return 1; | |
2912 | ||
2913 | return 0; | |
2914 | } | |
2915 | ||
fa593d66 PA |
2916 | static CORE_ADDR gdb_jump_pad_head; |
2917 | ||
2918 | /* Return the address of the next free jump space. */ | |
2919 | ||
2920 | static CORE_ADDR | |
2921 | get_jump_space_head (void) | |
2922 | { | |
2923 | if (gdb_jump_pad_head == 0) | |
2924 | { | |
2925 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer, | |
2926 | &gdb_jump_pad_head)) | |
38e08fca GB |
2927 | { |
2928 | internal_error (__FILE__, __LINE__, | |
2929 | "error extracting jump_pad_buffer"); | |
2930 | } | |
fa593d66 PA |
2931 | } |
2932 | ||
2933 | return gdb_jump_pad_head; | |
2934 | } | |
2935 | ||
2936 | /* Reserve USED bytes from the jump space. */ | |
2937 | ||
2938 | static void | |
2939 | claim_jump_space (ULONGEST used) | |
2940 | { | |
2941 | trace_debug ("claim_jump_space reserves %s bytes at %s", | |
2942 | pulongest (used), paddress (gdb_jump_pad_head)); | |
2943 | gdb_jump_pad_head += used; | |
2944 | } | |
2945 | ||
405f8e94 SS |
2946 | static CORE_ADDR trampoline_buffer_head = 0; |
2947 | static CORE_ADDR trampoline_buffer_tail; | |
2948 | ||
2949 | /* Reserve USED bytes from the trampoline buffer and return the | |
2950 | address of the start of the reserved space in TRAMPOLINE. Returns | |
2951 | non-zero if the space is successfully claimed. */ | |
2952 | ||
2953 | int | |
2954 | claim_trampoline_space (ULONGEST used, CORE_ADDR *trampoline) | |
2955 | { | |
2956 | if (!trampoline_buffer_head) | |
2957 | { | |
2958 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer, | |
2959 | &trampoline_buffer_tail)) | |
2960 | { | |
38e08fca GB |
2961 | internal_error (__FILE__, __LINE__, |
2962 | "error extracting trampoline_buffer"); | |
405f8e94 SS |
2963 | } |
2964 | ||
2965 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_end, | |
2966 | &trampoline_buffer_head)) | |
2967 | { | |
38e08fca GB |
2968 | internal_error (__FILE__, __LINE__, |
2969 | "error extracting trampoline_buffer_end"); | |
405f8e94 SS |
2970 | } |
2971 | } | |
2972 | ||
2973 | /* Start claiming space from the top of the trampoline space. If | |
2974 | the space is located at the bottom of the virtual address space, | |
2975 | this reduces the possibility that corruption will occur if a null | |
2976 | pointer is used to write to memory. */ | |
2977 | if (trampoline_buffer_head - trampoline_buffer_tail < used) | |
2978 | { | |
2979 | trace_debug ("claim_trampoline_space failed to reserve %s bytes", | |
2980 | pulongest (used)); | |
2981 | return 0; | |
2982 | } | |
2983 | ||
2984 | trampoline_buffer_head -= used; | |
2985 | ||
2986 | trace_debug ("claim_trampoline_space reserves %s bytes at %s", | |
2987 | pulongest (used), paddress (trampoline_buffer_head)); | |
2988 | ||
2989 | *trampoline = trampoline_buffer_head; | |
2990 | return 1; | |
2991 | } | |
2992 | ||
2993 | /* Returns non-zero if there is space allocated for use in trampolines | |
2994 | for fast tracepoints. */ | |
2995 | ||
2996 | int | |
2997 | have_fast_tracepoint_trampoline_buffer (char *buf) | |
2998 | { | |
2999 | CORE_ADDR trampoline_end, errbuf; | |
3000 | ||
3001 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_end, | |
3002 | &trampoline_end)) | |
3003 | { | |
38e08fca GB |
3004 | internal_error (__FILE__, __LINE__, |
3005 | "error extracting trampoline_buffer_end"); | |
405f8e94 SS |
3006 | } |
3007 | ||
3008 | if (buf) | |
3009 | { | |
3010 | buf[0] = '\0'; | |
3011 | strcpy (buf, "was claiming"); | |
3012 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_error, | |
3013 | &errbuf)) | |
3014 | { | |
38e08fca GB |
3015 | internal_error (__FILE__, __LINE__, |
3016 | "error extracting errbuf"); | |
405f8e94 SS |
3017 | } |
3018 | ||
3019 | read_inferior_memory (errbuf, (unsigned char *) buf, 100); | |
3020 | } | |
3021 | ||
3022 | return trampoline_end != 0; | |
3023 | } | |
3024 | ||
0fb4aa4b PA |
3025 | /* Ask the IPA to probe the marker at ADDRESS. Returns -1 if running |
3026 | the command fails, or 0 otherwise. If the command ran | |
3027 | successfully, but probing the marker failed, ERROUT will be filled | |
3028 | with the error to reply to GDB, and -1 is also returned. This | |
3029 | allows directly passing IPA errors to GDB. */ | |
3030 | ||
3031 | static int | |
3032 | probe_marker_at (CORE_ADDR address, char *errout) | |
3033 | { | |
2fa291ac | 3034 | char cmd[IPA_CMD_BUF_SIZE]; |
0fb4aa4b PA |
3035 | int err; |
3036 | ||
3037 | sprintf (cmd, "probe_marker_at:%s", paddress (address)); | |
42476b70 | 3038 | err = run_inferior_command (cmd, strlen (cmd) + 1); |
0fb4aa4b PA |
3039 | |
3040 | if (err == 0) | |
3041 | { | |
3042 | if (*cmd == 'E') | |
3043 | { | |
3044 | strcpy (errout, cmd); | |
3045 | return -1; | |
3046 | } | |
3047 | } | |
3048 | ||
3049 | return err; | |
3050 | } | |
3051 | ||
219f2f23 | 3052 | static void |
5c73ff4e | 3053 | clone_fast_tracepoint (struct tracepoint *to, const struct tracepoint *from) |
219f2f23 | 3054 | { |
5c73ff4e YQ |
3055 | to->jump_pad = from->jump_pad; |
3056 | to->jump_pad_end = from->jump_pad_end; | |
405f8e94 SS |
3057 | to->trampoline = from->trampoline; |
3058 | to->trampoline_end = from->trampoline_end; | |
5c73ff4e YQ |
3059 | to->adjusted_insn_addr = from->adjusted_insn_addr; |
3060 | to->adjusted_insn_addr_end = from->adjusted_insn_addr_end; | |
3061 | to->handle = from->handle; | |
fa593d66 | 3062 | |
5c73ff4e YQ |
3063 | gdb_assert (from->handle); |
3064 | inc_ref_fast_tracepoint_jump ((struct fast_tracepoint_jump *) from->handle); | |
3065 | } | |
3066 | ||
3067 | #define MAX_JUMP_SIZE 20 | |
3068 | ||
3069 | /* Install fast tracepoint. Return 0 if successful, otherwise return | |
3070 | non-zero. */ | |
3071 | ||
3072 | static int | |
405f8e94 | 3073 | install_fast_tracepoint (struct tracepoint *tpoint, char *errbuf) |
5c73ff4e YQ |
3074 | { |
3075 | CORE_ADDR jentry, jump_entry; | |
405f8e94 | 3076 | CORE_ADDR trampoline; |
1cda1512 | 3077 | CORE_ADDR collect; |
405f8e94 | 3078 | ULONGEST trampoline_size; |
5c73ff4e | 3079 | int err = 0; |
fa593d66 PA |
3080 | /* The jump to the jump pad of the last fast tracepoint |
3081 | installed. */ | |
3082 | unsigned char fjump[MAX_JUMP_SIZE]; | |
3083 | ULONGEST fjump_size; | |
219f2f23 | 3084 | |
405f8e94 SS |
3085 | if (tpoint->orig_size < target_get_min_fast_tracepoint_insn_len ()) |
3086 | { | |
3087 | trace_debug ("Requested a fast tracepoint on an instruction " | |
3088 | "that is of less than the minimum length."); | |
3089 | return 0; | |
3090 | } | |
3091 | ||
1cda1512 MK |
3092 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_collect_ptr, |
3093 | &collect)) | |
3094 | { | |
3095 | error ("error extracting gdb_collect_ptr"); | |
3096 | return 1; | |
3097 | } | |
3098 | ||
5c73ff4e YQ |
3099 | jentry = jump_entry = get_jump_space_head (); |
3100 | ||
405f8e94 SS |
3101 | trampoline = 0; |
3102 | trampoline_size = 0; | |
3103 | ||
5c73ff4e YQ |
3104 | /* Install the jump pad. */ |
3105 | err = install_fast_tracepoint_jump_pad (tpoint->obj_addr_on_target, | |
3106 | tpoint->address, | |
1cda1512 | 3107 | collect, |
5c73ff4e YQ |
3108 | ipa_sym_addrs.addr_collecting, |
3109 | tpoint->orig_size, | |
405f8e94 SS |
3110 | &jentry, |
3111 | &trampoline, &trampoline_size, | |
3112 | fjump, &fjump_size, | |
5c73ff4e | 3113 | &tpoint->adjusted_insn_addr, |
405f8e94 SS |
3114 | &tpoint->adjusted_insn_addr_end, |
3115 | errbuf); | |
5c73ff4e YQ |
3116 | |
3117 | if (err) | |
3118 | return 1; | |
3119 | ||
3120 | /* Wire it in. */ | |
3121 | tpoint->handle = set_fast_tracepoint_jump (tpoint->address, fjump, | |
3122 | fjump_size); | |
3123 | ||
3124 | if (tpoint->handle != NULL) | |
3125 | { | |
3126 | tpoint->jump_pad = jump_entry; | |
3127 | tpoint->jump_pad_end = jentry; | |
405f8e94 SS |
3128 | tpoint->trampoline = trampoline; |
3129 | tpoint->trampoline_end = trampoline + trampoline_size; | |
5c73ff4e YQ |
3130 | |
3131 | /* Pad to 8-byte alignment. */ | |
3132 | jentry = ((jentry + 7) & ~0x7); | |
3133 | claim_jump_space (jentry - jump_entry); | |
3134 | } | |
3135 | ||
3136 | return 0; | |
3137 | } | |
3138 | ||
1e4d1764 YQ |
3139 | |
3140 | /* Install tracepoint TPOINT, and write reply message in OWN_BUF. */ | |
3141 | ||
3142 | static void | |
3143 | install_tracepoint (struct tracepoint *tpoint, char *own_buf) | |
3144 | { | |
3145 | tpoint->handle = NULL; | |
3146 | *own_buf = '\0'; | |
3147 | ||
3148 | if (tpoint->type == trap_tracepoint) | |
3149 | { | |
3150 | /* Tracepoints are installed as memory breakpoints. Just go | |
3151 | ahead and install the trap. The breakpoints module | |
3152 | handles duplicated breakpoints, and the memory read | |
3153 | routine handles un-patching traps from memory reads. */ | |
3154 | tpoint->handle = set_breakpoint_at (tpoint->address, | |
3155 | tracepoint_handler); | |
3156 | } | |
3157 | else if (tpoint->type == fast_tracepoint || tpoint->type == static_tracepoint) | |
3158 | { | |
58b4daa5 | 3159 | if (!agent_loaded_p ()) |
1e4d1764 YQ |
3160 | { |
3161 | trace_debug ("Requested a %s tracepoint, but fast " | |
3162 | "tracepoints aren't supported.", | |
3163 | tpoint->type == static_tracepoint ? "static" : "fast"); | |
3164 | write_e_ipa_not_loaded (own_buf); | |
3165 | return; | |
3166 | } | |
8ffcbaaf YQ |
3167 | if (tpoint->type == static_tracepoint |
3168 | && !in_process_agent_supports_ust ()) | |
1e4d1764 YQ |
3169 | { |
3170 | trace_debug ("Requested a static tracepoint, but static " | |
3171 | "tracepoints are not supported."); | |
3172 | write_e_ust_not_loaded (own_buf); | |
3173 | return; | |
3174 | } | |
3175 | ||
1e4d1764 | 3176 | if (tpoint->type == fast_tracepoint) |
fc3e5175 | 3177 | install_fast_tracepoint (tpoint, own_buf); |
1e4d1764 YQ |
3178 | else |
3179 | { | |
fc3e5175 | 3180 | if (probe_marker_at (tpoint->address, own_buf) == 0) |
1e4d1764 | 3181 | tpoint->handle = (void *) -1; |
1e4d1764 YQ |
3182 | } |
3183 | ||
3184 | } | |
3185 | else | |
3186 | internal_error (__FILE__, __LINE__, "Unknown tracepoint type"); | |
3187 | ||
3188 | if (tpoint->handle == NULL) | |
3189 | { | |
3190 | if (*own_buf == '\0') | |
3191 | write_enn (own_buf); | |
3192 | } | |
3193 | else | |
3194 | write_ok (own_buf); | |
3195 | } | |
3196 | ||
7bc83639 YQ |
3197 | static void download_tracepoint_1 (struct tracepoint *tpoint); |
3198 | ||
5c73ff4e YQ |
3199 | static void |
3200 | cmd_qtstart (char *packet) | |
3201 | { | |
3202 | struct tracepoint *tpoint, *prev_ftpoint, *prev_stpoint; | |
7bc83639 | 3203 | CORE_ADDR tpptr = 0, prev_tpptr = 0; |
5c73ff4e | 3204 | |
219f2f23 PA |
3205 | trace_debug ("Starting the trace"); |
3206 | ||
7984d532 | 3207 | /* Pause all threads temporarily while we patch tracepoints. */ |
fa593d66 PA |
3208 | pause_all (0); |
3209 | ||
3210 | /* Get threads out of jump pads. Safe to do here, since this is a | |
3211 | top level command. And, required to do here, since we're | |
3212 | deleting/rewriting jump pads. */ | |
3213 | ||
3214 | stabilize_threads (); | |
3215 | ||
3216 | /* Freeze threads. */ | |
7984d532 PA |
3217 | pause_all (1); |
3218 | ||
fa593d66 | 3219 | /* Sync the fast tracepoints list in the inferior ftlib. */ |
58b4daa5 | 3220 | if (agent_loaded_p ()) |
7bc83639 | 3221 | download_trace_state_variables (); |
fa593d66 PA |
3222 | |
3223 | /* No previous fast tpoint yet. */ | |
3224 | prev_ftpoint = NULL; | |
3225 | ||
0fb4aa4b PA |
3226 | /* No previous static tpoint yet. */ |
3227 | prev_stpoint = NULL; | |
3228 | ||
fa593d66 PA |
3229 | *packet = '\0'; |
3230 | ||
6896a8fa MK |
3231 | if (agent_loaded_p ()) |
3232 | { | |
3233 | /* Tell IPA about the correct tdesc. */ | |
3234 | if (write_inferior_integer (ipa_sym_addrs.addr_ipa_tdesc_idx, | |
3235 | target_get_ipa_tdesc_idx ())) | |
3236 | error ("Error setting ipa_tdesc_idx variable in lib"); | |
3237 | } | |
ae91f625 | 3238 | |
7bc83639 YQ |
3239 | /* Start out empty. */ |
3240 | if (agent_loaded_p ()) | |
020ecd38 | 3241 | write_inferior_data_pointer (ipa_sym_addrs.addr_tracepoints, 0); |
7bc83639 YQ |
3242 | |
3243 | /* Download and install tracepoints. */ | |
219f2f23 PA |
3244 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) |
3245 | { | |
3246 | /* Ensure all the hit counts start at zero. */ | |
3247 | tpoint->hit_count = 0; | |
f196051f | 3248 | tpoint->traceframe_usage = 0; |
219f2f23 | 3249 | |
fa593d66 PA |
3250 | if (tpoint->type == trap_tracepoint) |
3251 | { | |
fa593d66 PA |
3252 | /* Tracepoints are installed as memory breakpoints. Just go |
3253 | ahead and install the trap. The breakpoints module | |
3254 | handles duplicated breakpoints, and the memory read | |
3255 | routine handles un-patching traps from memory reads. */ | |
3256 | tpoint->handle = set_breakpoint_at (tpoint->address, | |
3257 | tracepoint_handler); | |
3258 | } | |
7bc83639 YQ |
3259 | else if (tpoint->type == fast_tracepoint |
3260 | || tpoint->type == static_tracepoint) | |
fa593d66 | 3261 | { |
fa593d66 PA |
3262 | if (maybe_write_ipa_not_loaded (packet)) |
3263 | { | |
7bc83639 YQ |
3264 | trace_debug ("Requested a %s tracepoint, but fast " |
3265 | "tracepoints aren't supported.", | |
3266 | tpoint->type == static_tracepoint | |
3267 | ? "static" : "fast"); | |
fa593d66 PA |
3268 | break; |
3269 | } | |
3270 | ||
7bc83639 | 3271 | if (tpoint->type == fast_tracepoint) |
0fb4aa4b | 3272 | { |
80d26939 YQ |
3273 | int use_agent_p |
3274 | = use_agent && agent_capability_check (AGENT_CAPA_FAST_TRACE); | |
3275 | ||
7bc83639 YQ |
3276 | if (prev_ftpoint != NULL |
3277 | && prev_ftpoint->address == tpoint->address) | |
80d26939 YQ |
3278 | { |
3279 | if (use_agent_p) | |
3280 | tracepoint_send_agent (tpoint); | |
3281 | else | |
3282 | download_tracepoint_1 (tpoint); | |
3283 | ||
3284 | clone_fast_tracepoint (tpoint, prev_ftpoint); | |
3285 | } | |
7bc83639 YQ |
3286 | else |
3287 | { | |
42476b70 YQ |
3288 | /* Tracepoint is installed successfully? */ |
3289 | int installed = 0; | |
3290 | ||
3291 | /* Download and install fast tracepoint by agent. */ | |
80d26939 | 3292 | if (use_agent_p) |
42476b70 YQ |
3293 | installed = !tracepoint_send_agent (tpoint); |
3294 | else | |
3295 | { | |
3296 | download_tracepoint_1 (tpoint); | |
3297 | installed = !install_fast_tracepoint (tpoint, packet); | |
3298 | } | |
3299 | ||
3300 | if (installed) | |
7bc83639 YQ |
3301 | prev_ftpoint = tpoint; |
3302 | } | |
0fb4aa4b PA |
3303 | } |
3304 | else | |
3305 | { | |
7bc83639 | 3306 | if (!in_process_agent_supports_ust ()) |
0fb4aa4b | 3307 | { |
7bc83639 YQ |
3308 | trace_debug ("Requested a static tracepoint, but static " |
3309 | "tracepoints are not supported."); | |
3310 | break; | |
3311 | } | |
0fb4aa4b | 3312 | |
7bc83639 YQ |
3313 | download_tracepoint_1 (tpoint); |
3314 | /* Can only probe a given marker once. */ | |
3315 | if (prev_stpoint != NULL | |
3316 | && prev_stpoint->address == tpoint->address) | |
3317 | tpoint->handle = (void *) -1; | |
3318 | else | |
3319 | { | |
3320 | if (probe_marker_at (tpoint->address, packet) == 0) | |
3321 | { | |
3322 | tpoint->handle = (void *) -1; | |
3323 | ||
3324 | /* So that we can handle multiple static tracepoints | |
3325 | at the same address easily. */ | |
3326 | prev_stpoint = tpoint; | |
3327 | } | |
0fb4aa4b PA |
3328 | } |
3329 | } | |
7bc83639 YQ |
3330 | |
3331 | prev_tpptr = tpptr; | |
3332 | tpptr = tpoint->obj_addr_on_target; | |
3333 | ||
3334 | if (tpoint == tracepoints) | |
3335 | /* First object in list, set the head pointer in the | |
3336 | inferior. */ | |
020ecd38 | 3337 | write_inferior_data_pointer (ipa_sym_addrs.addr_tracepoints, tpptr); |
7bc83639 | 3338 | else |
020ecd38 MK |
3339 | write_inferior_data_pointer (prev_tpptr |
3340 | + offsetof (struct tracepoint, next), | |
3341 | tpptr); | |
0fb4aa4b | 3342 | } |
fa593d66 PA |
3343 | |
3344 | /* Any failure in the inner loop is sufficient cause to give | |
3345 | up. */ | |
219f2f23 PA |
3346 | if (tpoint->handle == NULL) |
3347 | break; | |
3348 | } | |
3349 | ||
3350 | /* Any error in tracepoint insertion is unacceptable; better to | |
3351 | address the problem now, than end up with a useless or misleading | |
3352 | trace run. */ | |
3353 | if (tpoint != NULL) | |
3354 | { | |
3355 | clear_installed_tracepoints (); | |
3356 | if (*packet == '\0') | |
3357 | write_enn (packet); | |
7984d532 | 3358 | unpause_all (1); |
219f2f23 PA |
3359 | return; |
3360 | } | |
3361 | ||
3362 | stopping_tracepoint = NULL; | |
3363 | trace_buffer_is_full = 0; | |
3364 | expr_eval_result = expr_eval_no_error; | |
3365 | error_tracepoint = NULL; | |
f196051f | 3366 | tracing_start_time = get_timestamp (); |
219f2f23 PA |
3367 | |
3368 | /* Tracing is now active, hits will now start being logged. */ | |
3369 | tracing = 1; | |
3370 | ||
58b4daa5 | 3371 | if (agent_loaded_p ()) |
fa593d66 PA |
3372 | { |
3373 | if (write_inferior_integer (ipa_sym_addrs.addr_tracing, 1)) | |
38e08fca GB |
3374 | { |
3375 | internal_error (__FILE__, __LINE__, | |
3376 | "Error setting tracing variable in lib"); | |
3377 | } | |
fa593d66 PA |
3378 | |
3379 | if (write_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, | |
3380 | 0)) | |
38e08fca GB |
3381 | { |
3382 | internal_error (__FILE__, __LINE__, | |
3383 | "Error clearing stopping_tracepoint variable" | |
3384 | " in lib"); | |
3385 | } | |
fa593d66 PA |
3386 | |
3387 | if (write_inferior_integer (ipa_sym_addrs.addr_trace_buffer_is_full, 0)) | |
38e08fca GB |
3388 | { |
3389 | internal_error (__FILE__, __LINE__, | |
3390 | "Error clearing trace_buffer_is_full variable" | |
3391 | " in lib"); | |
3392 | } | |
fa593d66 PA |
3393 | |
3394 | stop_tracing_bkpt = set_breakpoint_at (ipa_sym_addrs.addr_stop_tracing, | |
3395 | stop_tracing_handler); | |
3396 | if (stop_tracing_bkpt == NULL) | |
3397 | error ("Error setting stop_tracing breakpoint"); | |
3398 | ||
3399 | flush_trace_buffer_bkpt | |
3400 | = set_breakpoint_at (ipa_sym_addrs.addr_flush_trace_buffer, | |
3401 | flush_trace_buffer_handler); | |
3402 | if (flush_trace_buffer_bkpt == NULL) | |
3403 | error ("Error setting flush_trace_buffer breakpoint"); | |
3404 | } | |
3405 | ||
7984d532 PA |
3406 | unpause_all (1); |
3407 | ||
219f2f23 PA |
3408 | write_ok (packet); |
3409 | } | |
3410 | ||
3411 | /* End a tracing run, filling in a stop reason to report back to GDB, | |
3412 | and removing the tracepoints from the code. */ | |
3413 | ||
8336d594 | 3414 | void |
219f2f23 PA |
3415 | stop_tracing (void) |
3416 | { | |
3417 | if (!tracing) | |
3418 | { | |
3419 | trace_debug ("Tracing is already off, ignoring"); | |
3420 | return; | |
3421 | } | |
3422 | ||
3423 | trace_debug ("Stopping the trace"); | |
3424 | ||
fa593d66 PA |
3425 | /* Pause all threads before removing fast jumps from memory, |
3426 | breakpoints, and touching IPA state variables (inferior memory). | |
3427 | Some thread may hit the internal tracing breakpoints, or be | |
3428 | collecting this moment, but that's ok, we don't release the | |
3429 | tpoint object's memory or the jump pads here (we only do that | |
3430 | when we're sure we can move all threads out of the jump pads). | |
3431 | We can't now, since we may be getting here due to the inferior | |
3432 | agent calling us. */ | |
7984d532 | 3433 | pause_all (1); |
7984d532 | 3434 | |
219f2f23 PA |
3435 | /* Stop logging. Tracepoints can still be hit, but they will not be |
3436 | recorded. */ | |
3437 | tracing = 0; | |
58b4daa5 | 3438 | if (agent_loaded_p ()) |
fa593d66 PA |
3439 | { |
3440 | if (write_inferior_integer (ipa_sym_addrs.addr_tracing, 0)) | |
38e08fca GB |
3441 | { |
3442 | internal_error (__FILE__, __LINE__, | |
3443 | "Error clearing tracing variable in lib"); | |
3444 | } | |
fa593d66 | 3445 | } |
219f2f23 | 3446 | |
f196051f | 3447 | tracing_stop_time = get_timestamp (); |
219f2f23 PA |
3448 | tracing_stop_reason = "t???"; |
3449 | tracing_stop_tpnum = 0; | |
3450 | if (stopping_tracepoint) | |
3451 | { | |
3452 | trace_debug ("Stopping the trace because " | |
5f18041e | 3453 | "tracepoint %d was hit %" PRIu64 " times", |
219f2f23 PA |
3454 | stopping_tracepoint->number, |
3455 | stopping_tracepoint->pass_count); | |
3456 | tracing_stop_reason = "tpasscount"; | |
3457 | tracing_stop_tpnum = stopping_tracepoint->number; | |
3458 | } | |
3459 | else if (trace_buffer_is_full) | |
3460 | { | |
3461 | trace_debug ("Stopping the trace because the trace buffer is full"); | |
3462 | tracing_stop_reason = "tfull"; | |
3463 | } | |
3464 | else if (expr_eval_result != expr_eval_no_error) | |
3465 | { | |
3466 | trace_debug ("Stopping the trace because of an expression eval error"); | |
3467 | tracing_stop_reason = eval_result_names[expr_eval_result]; | |
3468 | tracing_stop_tpnum = error_tracepoint->number; | |
3469 | } | |
fa593d66 | 3470 | #ifndef IN_PROCESS_AGENT |
8336d594 PA |
3471 | else if (!gdb_connected ()) |
3472 | { | |
3473 | trace_debug ("Stopping the trace because GDB disconnected"); | |
3474 | tracing_stop_reason = "tdisconnected"; | |
3475 | } | |
fa593d66 | 3476 | #endif |
219f2f23 PA |
3477 | else |
3478 | { | |
3479 | trace_debug ("Stopping the trace because of a tstop command"); | |
3480 | tracing_stop_reason = "tstop"; | |
3481 | } | |
3482 | ||
3483 | stopping_tracepoint = NULL; | |
3484 | error_tracepoint = NULL; | |
3485 | ||
3486 | /* Clear out the tracepoints. */ | |
3487 | clear_installed_tracepoints (); | |
7984d532 | 3488 | |
58b4daa5 | 3489 | if (agent_loaded_p ()) |
fa593d66 PA |
3490 | { |
3491 | /* Pull in fast tracepoint trace frames from the inferior lib | |
3492 | buffer into our buffer, even if our buffer is already full, | |
3493 | because we want to present the full number of created frames | |
3494 | in addition to what fit in the trace buffer. */ | |
3495 | upload_fast_traceframes (); | |
3496 | } | |
3497 | ||
3498 | if (stop_tracing_bkpt != NULL) | |
3499 | { | |
3500 | delete_breakpoint (stop_tracing_bkpt); | |
3501 | stop_tracing_bkpt = NULL; | |
3502 | } | |
3503 | ||
3504 | if (flush_trace_buffer_bkpt != NULL) | |
3505 | { | |
3506 | delete_breakpoint (flush_trace_buffer_bkpt); | |
3507 | flush_trace_buffer_bkpt = NULL; | |
3508 | } | |
3509 | ||
7984d532 | 3510 | unpause_all (1); |
219f2f23 PA |
3511 | } |
3512 | ||
fa593d66 PA |
3513 | static int |
3514 | stop_tracing_handler (CORE_ADDR addr) | |
3515 | { | |
3516 | trace_debug ("lib hit stop_tracing"); | |
3517 | ||
3518 | /* Don't actually handle it here. When we stop tracing we remove | |
3519 | breakpoints from the inferior, and that is not allowed in a | |
3520 | breakpoint handler (as the caller is walking the breakpoint | |
3521 | list). */ | |
3522 | return 0; | |
3523 | } | |
3524 | ||
3525 | static int | |
3526 | flush_trace_buffer_handler (CORE_ADDR addr) | |
3527 | { | |
3528 | trace_debug ("lib hit flush_trace_buffer"); | |
3529 | return 0; | |
3530 | } | |
3531 | ||
219f2f23 PA |
3532 | static void |
3533 | cmd_qtstop (char *packet) | |
3534 | { | |
3535 | stop_tracing (); | |
3536 | write_ok (packet); | |
3537 | } | |
3538 | ||
8336d594 PA |
3539 | static void |
3540 | cmd_qtdisconnected (char *own_buf) | |
3541 | { | |
3542 | ULONGEST setting; | |
3543 | char *packet = own_buf; | |
3544 | ||
3545 | packet += strlen ("QTDisconnected:"); | |
3546 | ||
3547 | unpack_varlen_hex (packet, &setting); | |
3548 | ||
3549 | write_ok (own_buf); | |
3550 | ||
3551 | disconnected_tracing = setting; | |
3552 | } | |
3553 | ||
219f2f23 PA |
3554 | static void |
3555 | cmd_qtframe (char *own_buf) | |
3556 | { | |
3557 | ULONGEST frame, pc, lo, hi, num; | |
3558 | int tfnum, tpnum; | |
3559 | struct traceframe *tframe; | |
3560 | char *packet = own_buf; | |
3561 | ||
3562 | packet += strlen ("QTFrame:"); | |
3563 | ||
61012eef | 3564 | if (startswith (packet, "pc:")) |
219f2f23 PA |
3565 | { |
3566 | packet += strlen ("pc:"); | |
f8f67713 | 3567 | unpack_varlen_hex (packet, &pc); |
219f2f23 PA |
3568 | trace_debug ("Want to find next traceframe at pc=0x%s", paddress (pc)); |
3569 | tframe = find_next_traceframe_in_range (pc, pc, 1, &tfnum); | |
3570 | } | |
61012eef | 3571 | else if (startswith (packet, "range:")) |
219f2f23 PA |
3572 | { |
3573 | packet += strlen ("range:"); | |
3574 | packet = unpack_varlen_hex (packet, &lo); | |
3575 | ++packet; | |
f8f67713 | 3576 | unpack_varlen_hex (packet, &hi); |
219f2f23 PA |
3577 | trace_debug ("Want to find next traceframe in the range 0x%s to 0x%s", |
3578 | paddress (lo), paddress (hi)); | |
3579 | tframe = find_next_traceframe_in_range (lo, hi, 1, &tfnum); | |
3580 | } | |
61012eef | 3581 | else if (startswith (packet, "outside:")) |
219f2f23 PA |
3582 | { |
3583 | packet += strlen ("outside:"); | |
3584 | packet = unpack_varlen_hex (packet, &lo); | |
3585 | ++packet; | |
f8f67713 | 3586 | unpack_varlen_hex (packet, &hi); |
219f2f23 PA |
3587 | trace_debug ("Want to find next traceframe " |
3588 | "outside the range 0x%s to 0x%s", | |
3589 | paddress (lo), paddress (hi)); | |
3590 | tframe = find_next_traceframe_in_range (lo, hi, 0, &tfnum); | |
3591 | } | |
61012eef | 3592 | else if (startswith (packet, "tdp:")) |
219f2f23 PA |
3593 | { |
3594 | packet += strlen ("tdp:"); | |
f8f67713 | 3595 | unpack_varlen_hex (packet, &num); |
219f2f23 PA |
3596 | tpnum = (int) num; |
3597 | trace_debug ("Want to find next traceframe for tracepoint %d", tpnum); | |
3598 | tframe = find_next_traceframe_by_tracepoint (tpnum, &tfnum); | |
3599 | } | |
3600 | else | |
3601 | { | |
3602 | unpack_varlen_hex (packet, &frame); | |
3603 | tfnum = (int) frame; | |
3604 | if (tfnum == -1) | |
3605 | { | |
3606 | trace_debug ("Want to stop looking at traceframes"); | |
3607 | current_traceframe = -1; | |
3608 | write_ok (own_buf); | |
3609 | return; | |
3610 | } | |
3611 | trace_debug ("Want to look at traceframe %d", tfnum); | |
3612 | tframe = find_traceframe (tfnum); | |
3613 | } | |
3614 | ||
3615 | if (tframe) | |
3616 | { | |
3617 | current_traceframe = tfnum; | |
3618 | sprintf (own_buf, "F%xT%x", tfnum, tframe->tpnum); | |
3619 | } | |
3620 | else | |
3621 | sprintf (own_buf, "F-1"); | |
3622 | } | |
3623 | ||
3624 | static void | |
3625 | cmd_qtstatus (char *packet) | |
3626 | { | |
3627 | char *stop_reason_rsp = NULL; | |
eef49a3d PA |
3628 | char *buf1, *buf2, *buf3; |
3629 | const char *str; | |
f196051f SS |
3630 | int slen; |
3631 | ||
3632 | /* Translate the plain text of the notes back into hex for | |
3633 | transmission. */ | |
3634 | ||
3635 | str = (tracing_user_name ? tracing_user_name : ""); | |
3636 | slen = strlen (str); | |
3637 | buf1 = (char *) alloca (slen * 2 + 1); | |
971dc0b8 | 3638 | bin2hex ((gdb_byte *) str, buf1, slen); |
f196051f SS |
3639 | |
3640 | str = (tracing_notes ? tracing_notes : ""); | |
3641 | slen = strlen (str); | |
3642 | buf2 = (char *) alloca (slen * 2 + 1); | |
971dc0b8 | 3643 | bin2hex ((gdb_byte *) str, buf2, slen); |
f196051f SS |
3644 | |
3645 | str = (tracing_stop_note ? tracing_stop_note : ""); | |
3646 | slen = strlen (str); | |
3647 | buf3 = (char *) alloca (slen * 2 + 1); | |
971dc0b8 | 3648 | bin2hex ((gdb_byte *) str, buf3, slen); |
219f2f23 PA |
3649 | |
3650 | trace_debug ("Returning trace status as %d, stop reason %s", | |
3651 | tracing, tracing_stop_reason); | |
3652 | ||
58b4daa5 | 3653 | if (agent_loaded_p ()) |
fa593d66 PA |
3654 | { |
3655 | pause_all (1); | |
3656 | ||
3657 | upload_fast_traceframes (); | |
3658 | ||
3659 | unpause_all (1); | |
3660 | } | |
3661 | ||
219f2f23 PA |
3662 | stop_reason_rsp = (char *) tracing_stop_reason; |
3663 | ||
3664 | /* The user visible error string in terror needs to be hex encoded. | |
f196051f | 3665 | We leave it as plain string in `tracing_stop_reason' to ease |
219f2f23 | 3666 | debugging. */ |
61012eef | 3667 | if (startswith (stop_reason_rsp, "terror:")) |
219f2f23 PA |
3668 | { |
3669 | const char *result_name; | |
3670 | int hexstr_len; | |
3671 | char *p; | |
3672 | ||
3673 | result_name = stop_reason_rsp + strlen ("terror:"); | |
3674 | hexstr_len = strlen (result_name) * 2; | |
224c3ddb SM |
3675 | p = stop_reason_rsp |
3676 | = (char *) alloca (strlen ("terror:") + hexstr_len + 1); | |
219f2f23 PA |
3677 | strcpy (p, "terror:"); |
3678 | p += strlen (p); | |
e9371aff | 3679 | bin2hex ((gdb_byte *) result_name, p, strlen (result_name)); |
219f2f23 PA |
3680 | } |
3681 | ||
f196051f SS |
3682 | /* If this was a forced stop, include any stop note that was supplied. */ |
3683 | if (strcmp (stop_reason_rsp, "tstop") == 0) | |
3684 | { | |
224c3ddb | 3685 | stop_reason_rsp = (char *) alloca (strlen ("tstop:") + strlen (buf3) + 1); |
f196051f SS |
3686 | strcpy (stop_reason_rsp, "tstop:"); |
3687 | strcat (stop_reason_rsp, buf3); | |
3688 | } | |
3689 | ||
8336d594 PA |
3690 | sprintf (packet, |
3691 | "T%d;" | |
3692 | "%s:%x;" | |
3693 | "tframes:%x;tcreated:%x;" | |
3694 | "tfree:%x;tsize:%s;" | |
3695 | "circular:%d;" | |
f196051f | 3696 | "disconn:%d;" |
242f5f1c | 3697 | "starttime:%s;stoptime:%s;" |
86ebe149 | 3698 | "username:%s;notes:%s:", |
623ccd72 | 3699 | tracing ? 1 : 0, |
219f2f23 PA |
3700 | stop_reason_rsp, tracing_stop_tpnum, |
3701 | traceframe_count, traceframes_created, | |
8336d594 PA |
3702 | free_space (), phex_nz (trace_buffer_hi - trace_buffer_lo, 0), |
3703 | circular_trace_buffer, | |
f196051f | 3704 | disconnected_tracing, |
f30aa5af DK |
3705 | phex_nz (tracing_start_time, sizeof (tracing_start_time)), |
3706 | phex_nz (tracing_stop_time, sizeof (tracing_stop_time)), | |
f196051f SS |
3707 | buf1, buf2); |
3708 | } | |
3709 | ||
3710 | static void | |
3711 | cmd_qtp (char *own_buf) | |
3712 | { | |
3713 | ULONGEST num, addr; | |
3714 | struct tracepoint *tpoint; | |
3715 | char *packet = own_buf; | |
3716 | ||
3717 | packet += strlen ("qTP:"); | |
3718 | ||
3719 | packet = unpack_varlen_hex (packet, &num); | |
3720 | ++packet; /* skip a colon */ | |
3721 | packet = unpack_varlen_hex (packet, &addr); | |
3722 | ||
3723 | /* See if we already have this tracepoint. */ | |
3724 | tpoint = find_tracepoint (num, addr); | |
3725 | ||
3726 | if (!tpoint) | |
3727 | { | |
3728 | trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found", | |
3729 | (int) num, paddress (addr)); | |
3730 | write_enn (own_buf); | |
3731 | return; | |
3732 | } | |
3733 | ||
5f18041e YQ |
3734 | sprintf (own_buf, "V%" PRIu64 ":%" PRIu64 "", tpoint->hit_count, |
3735 | tpoint->traceframe_usage); | |
219f2f23 PA |
3736 | } |
3737 | ||
3738 | /* State variables to help return all the tracepoint bits. */ | |
3739 | static struct tracepoint *cur_tpoint; | |
e64f7499 YQ |
3740 | static unsigned int cur_action; |
3741 | static unsigned int cur_step_action; | |
219f2f23 PA |
3742 | static struct source_string *cur_source_string; |
3743 | static struct trace_state_variable *cur_tsv; | |
3744 | ||
3745 | /* Compose a response that is an imitation of the syntax by which the | |
3746 | tracepoint was originally downloaded. */ | |
3747 | ||
3748 | static void | |
3749 | response_tracepoint (char *packet, struct tracepoint *tpoint) | |
3750 | { | |
3751 | char *buf; | |
3752 | ||
5f18041e | 3753 | sprintf (packet, "T%x:%s:%c:%" PRIx64 ":%" PRIx64, tpoint->number, |
219f2f23 PA |
3754 | paddress (tpoint->address), |
3755 | (tpoint->enabled ? 'E' : 'D'), tpoint->step_count, | |
3756 | tpoint->pass_count); | |
fa593d66 PA |
3757 | if (tpoint->type == fast_tracepoint) |
3758 | sprintf (packet + strlen (packet), ":F%x", tpoint->orig_size); | |
0fb4aa4b PA |
3759 | else if (tpoint->type == static_tracepoint) |
3760 | sprintf (packet + strlen (packet), ":S"); | |
219f2f23 PA |
3761 | |
3762 | if (tpoint->cond) | |
3763 | { | |
5e1dc496 | 3764 | buf = gdb_unparse_agent_expr (tpoint->cond); |
219f2f23 PA |
3765 | sprintf (packet + strlen (packet), ":X%x,%s", |
3766 | tpoint->cond->length, buf); | |
3767 | free (buf); | |
3768 | } | |
3769 | } | |
3770 | ||
3771 | /* Compose a response that is an imitation of the syntax by which the | |
3772 | tracepoint action was originally downloaded (with the difference | |
3773 | that due to the way we store the actions, this will output a packet | |
3774 | per action, while GDB could have combined more than one action | |
3775 | per-packet. */ | |
3776 | ||
3777 | static void | |
3778 | response_action (char *packet, struct tracepoint *tpoint, | |
3779 | char *taction, int step) | |
3780 | { | |
3781 | sprintf (packet, "%c%x:%s:%s", | |
3782 | (step ? 'S' : 'A'), tpoint->number, paddress (tpoint->address), | |
3783 | taction); | |
3784 | } | |
3785 | ||
3786 | /* Compose a response that is an imitation of the syntax by which the | |
3787 | tracepoint source piece was originally downloaded. */ | |
3788 | ||
3789 | static void | |
3790 | response_source (char *packet, | |
3791 | struct tracepoint *tpoint, struct source_string *src) | |
3792 | { | |
3793 | char *buf; | |
3794 | int len; | |
3795 | ||
3796 | len = strlen (src->str); | |
224c3ddb | 3797 | buf = (char *) alloca (len * 2 + 1); |
e9371aff | 3798 | bin2hex ((gdb_byte *) src->str, buf, len); |
219f2f23 PA |
3799 | |
3800 | sprintf (packet, "Z%x:%s:%s:%x:%x:%s", | |
3801 | tpoint->number, paddress (tpoint->address), | |
3802 | src->type, 0, len, buf); | |
3803 | } | |
3804 | ||
3805 | /* Return the first piece of tracepoint definition, and initialize the | |
3806 | state machine that will iterate through all the tracepoint | |
3807 | bits. */ | |
3808 | ||
3809 | static void | |
3810 | cmd_qtfp (char *packet) | |
3811 | { | |
3812 | trace_debug ("Returning first tracepoint definition piece"); | |
3813 | ||
3814 | cur_tpoint = tracepoints; | |
e64f7499 | 3815 | cur_action = cur_step_action = 0; |
219f2f23 PA |
3816 | cur_source_string = NULL; |
3817 | ||
3818 | if (cur_tpoint) | |
3819 | response_tracepoint (packet, cur_tpoint); | |
3820 | else | |
3821 | strcpy (packet, "l"); | |
3822 | } | |
3823 | ||
3824 | /* Return additional pieces of tracepoint definition. Each action and | |
3825 | stepping action must go into its own packet, because of packet size | |
3826 | limits, and so we use state variables to deliver one piece at a | |
3827 | time. */ | |
3828 | ||
3829 | static void | |
3830 | cmd_qtsp (char *packet) | |
3831 | { | |
3832 | trace_debug ("Returning subsequent tracepoint definition piece"); | |
3833 | ||
3834 | if (!cur_tpoint) | |
3835 | { | |
3836 | /* This case would normally never occur, but be prepared for | |
3837 | GDB misbehavior. */ | |
3838 | strcpy (packet, "l"); | |
3839 | } | |
e64f7499 | 3840 | else if (cur_action < cur_tpoint->numactions) |
219f2f23 | 3841 | { |
219f2f23 PA |
3842 | response_action (packet, cur_tpoint, |
3843 | cur_tpoint->actions_str[cur_action], 0); | |
e64f7499 | 3844 | ++cur_action; |
219f2f23 | 3845 | } |
e64f7499 | 3846 | else if (cur_step_action < cur_tpoint->num_step_actions) |
219f2f23 | 3847 | { |
219f2f23 PA |
3848 | response_action (packet, cur_tpoint, |
3849 | cur_tpoint->step_actions_str[cur_step_action], 1); | |
e64f7499 | 3850 | ++cur_step_action; |
219f2f23 PA |
3851 | } |
3852 | else if ((cur_source_string | |
3853 | ? cur_source_string->next | |
3854 | : cur_tpoint->source_strings)) | |
3855 | { | |
3856 | if (cur_source_string) | |
3857 | cur_source_string = cur_source_string->next; | |
3858 | else | |
3859 | cur_source_string = cur_tpoint->source_strings; | |
3860 | response_source (packet, cur_tpoint, cur_source_string); | |
3861 | } | |
3862 | else | |
3863 | { | |
3864 | cur_tpoint = cur_tpoint->next; | |
e64f7499 | 3865 | cur_action = cur_step_action = 0; |
219f2f23 PA |
3866 | cur_source_string = NULL; |
3867 | if (cur_tpoint) | |
3868 | response_tracepoint (packet, cur_tpoint); | |
3869 | else | |
3870 | strcpy (packet, "l"); | |
3871 | } | |
3872 | } | |
3873 | ||
3874 | /* Compose a response that is an imitation of the syntax by which the | |
3875 | trace state variable was originally downloaded. */ | |
3876 | ||
3877 | static void | |
3878 | response_tsv (char *packet, struct trace_state_variable *tsv) | |
3879 | { | |
3880 | char *buf = (char *) ""; | |
3881 | int namelen; | |
3882 | ||
3883 | if (tsv->name) | |
3884 | { | |
3885 | namelen = strlen (tsv->name); | |
224c3ddb | 3886 | buf = (char *) alloca (namelen * 2 + 1); |
e9371aff | 3887 | bin2hex ((gdb_byte *) tsv->name, buf, namelen); |
219f2f23 PA |
3888 | } |
3889 | ||
3890 | sprintf (packet, "%x:%s:%x:%s", tsv->number, phex_nz (tsv->initial_value, 0), | |
3891 | tsv->getter ? 1 : 0, buf); | |
3892 | } | |
3893 | ||
3894 | /* Return the first trace state variable definition, and initialize | |
3895 | the state machine that will iterate through all the tsv bits. */ | |
3896 | ||
3897 | static void | |
3898 | cmd_qtfv (char *packet) | |
3899 | { | |
3900 | trace_debug ("Returning first trace state variable definition"); | |
3901 | ||
3902 | cur_tsv = trace_state_variables; | |
3903 | ||
3904 | if (cur_tsv) | |
3905 | response_tsv (packet, cur_tsv); | |
3906 | else | |
3907 | strcpy (packet, "l"); | |
3908 | } | |
3909 | ||
3910 | /* Return additional trace state variable definitions. */ | |
3911 | ||
3912 | static void | |
3913 | cmd_qtsv (char *packet) | |
3914 | { | |
918d227b | 3915 | trace_debug ("Returning additional trace state variable definition"); |
219f2f23 | 3916 | |
918d227b | 3917 | if (cur_tsv) |
219f2f23 PA |
3918 | { |
3919 | cur_tsv = cur_tsv->next; | |
3920 | if (cur_tsv) | |
3921 | response_tsv (packet, cur_tsv); | |
3922 | else | |
3923 | strcpy (packet, "l"); | |
3924 | } | |
3925 | else | |
3926 | strcpy (packet, "l"); | |
3927 | } | |
3928 | ||
0fb4aa4b PA |
3929 | /* Return the first static tracepoint marker, and initialize the state |
3930 | machine that will iterate through all the static tracepoints | |
3931 | markers. */ | |
3932 | ||
3933 | static void | |
3934 | cmd_qtfstm (char *packet) | |
3935 | { | |
3936 | if (!maybe_write_ipa_ust_not_loaded (packet)) | |
42476b70 | 3937 | run_inferior_command (packet, strlen (packet) + 1); |
0fb4aa4b PA |
3938 | } |
3939 | ||
3940 | /* Return additional static tracepoints markers. */ | |
3941 | ||
3942 | static void | |
3943 | cmd_qtsstm (char *packet) | |
3944 | { | |
3945 | if (!maybe_write_ipa_ust_not_loaded (packet)) | |
42476b70 | 3946 | run_inferior_command (packet, strlen (packet) + 1); |
0fb4aa4b PA |
3947 | } |
3948 | ||
3949 | /* Return the definition of the static tracepoint at a given address. | |
3950 | Result packet is the same as qTsST's. */ | |
3951 | ||
3952 | static void | |
3953 | cmd_qtstmat (char *packet) | |
3954 | { | |
3955 | if (!maybe_write_ipa_ust_not_loaded (packet)) | |
42476b70 | 3956 | run_inferior_command (packet, strlen (packet) + 1); |
0fb4aa4b PA |
3957 | } |
3958 | ||
649ebbca DE |
3959 | /* Helper for gdb_agent_about_to_close. |
3960 | Return non-zero if thread ENTRY is in the same process in DATA. */ | |
3961 | ||
3962 | static int | |
3963 | same_process_p (struct inferior_list_entry *entry, void *data) | |
3964 | { | |
9a3c8263 | 3965 | int *pid = (int *) data; |
649ebbca DE |
3966 | |
3967 | return ptid_get_pid (entry->id) == *pid; | |
3968 | } | |
3969 | ||
7255706c YQ |
3970 | /* Sent the agent a command to close it. */ |
3971 | ||
3972 | void | |
3973 | gdb_agent_about_to_close (int pid) | |
3974 | { | |
3975 | char buf[IPA_CMD_BUF_SIZE]; | |
3976 | ||
3977 | if (!maybe_write_ipa_not_loaded (buf)) | |
3978 | { | |
0bfdf32f | 3979 | struct thread_info *saved_thread; |
7255706c | 3980 | |
0bfdf32f | 3981 | saved_thread = current_thread; |
7255706c | 3982 | |
649ebbca | 3983 | /* Find any thread which belongs to process PID. */ |
0bfdf32f | 3984 | current_thread = (struct thread_info *) |
649ebbca | 3985 | find_inferior (&all_threads, same_process_p, &pid); |
7255706c YQ |
3986 | |
3987 | strcpy (buf, "close"); | |
3988 | ||
3989 | run_inferior_command (buf, strlen (buf) + 1); | |
3990 | ||
0bfdf32f | 3991 | current_thread = saved_thread; |
7255706c YQ |
3992 | } |
3993 | } | |
3994 | ||
405f8e94 SS |
3995 | /* Return the minimum instruction size needed for fast tracepoints as a |
3996 | hexadecimal number. */ | |
3997 | ||
3998 | static void | |
3999 | cmd_qtminftpilen (char *packet) | |
4000 | { | |
0bfdf32f | 4001 | if (current_thread == NULL) |
e886a173 PA |
4002 | { |
4003 | /* Indicate that the minimum length is currently unknown. */ | |
4004 | strcpy (packet, "0"); | |
4005 | return; | |
4006 | } | |
4007 | ||
405f8e94 SS |
4008 | sprintf (packet, "%x", target_get_min_fast_tracepoint_insn_len ()); |
4009 | } | |
4010 | ||
219f2f23 PA |
4011 | /* Respond to qTBuffer packet with a block of raw data from the trace |
4012 | buffer. GDB may ask for a lot, but we are allowed to reply with | |
4013 | only as much as will fit within packet limits or whatever. */ | |
4014 | ||
4015 | static void | |
4016 | cmd_qtbuffer (char *own_buf) | |
4017 | { | |
4018 | ULONGEST offset, num, tot; | |
4019 | unsigned char *tbp; | |
4020 | char *packet = own_buf; | |
4021 | ||
4022 | packet += strlen ("qTBuffer:"); | |
4023 | ||
4024 | packet = unpack_varlen_hex (packet, &offset); | |
4025 | ++packet; /* skip a comma */ | |
f8f67713 | 4026 | unpack_varlen_hex (packet, &num); |
219f2f23 PA |
4027 | |
4028 | trace_debug ("Want to get trace buffer, %d bytes at offset 0x%s", | |
736cd585 | 4029 | (int) num, phex_nz (offset, 0)); |
219f2f23 PA |
4030 | |
4031 | tot = (trace_buffer_hi - trace_buffer_lo) - free_space (); | |
4032 | ||
4033 | /* If we're right at the end, reply specially that we're done. */ | |
4034 | if (offset == tot) | |
4035 | { | |
4036 | strcpy (own_buf, "l"); | |
4037 | return; | |
4038 | } | |
4039 | ||
4040 | /* Object to any other out-of-bounds request. */ | |
4041 | if (offset > tot) | |
4042 | { | |
4043 | write_enn (own_buf); | |
4044 | return; | |
4045 | } | |
4046 | ||
4047 | /* Compute the pointer corresponding to the given offset, accounting | |
4048 | for wraparound. */ | |
4049 | tbp = trace_buffer_start + offset; | |
4050 | if (tbp >= trace_buffer_wrap) | |
4051 | tbp -= (trace_buffer_wrap - trace_buffer_lo); | |
4052 | ||
4053 | /* Trim to the remaining bytes if we're close to the end. */ | |
4054 | if (num > tot - offset) | |
4055 | num = tot - offset; | |
4056 | ||
4057 | /* Trim to available packet size. */ | |
4058 | if (num >= (PBUFSIZ - 16) / 2 ) | |
4059 | num = (PBUFSIZ - 16) / 2; | |
4060 | ||
e9371aff | 4061 | bin2hex (tbp, own_buf, num); |
219f2f23 PA |
4062 | } |
4063 | ||
4064 | static void | |
277e4e52 | 4065 | cmd_bigqtbuffer_circular (char *own_buf) |
219f2f23 PA |
4066 | { |
4067 | ULONGEST val; | |
4068 | char *packet = own_buf; | |
4069 | ||
277e4e52 | 4070 | packet += strlen ("QTBuffer:circular:"); |
219f2f23 | 4071 | |
277e4e52 PA |
4072 | unpack_varlen_hex (packet, &val); |
4073 | circular_trace_buffer = val; | |
4074 | trace_debug ("Trace buffer is now %s", | |
4075 | circular_trace_buffer ? "circular" : "linear"); | |
4076 | write_ok (own_buf); | |
219f2f23 PA |
4077 | } |
4078 | ||
f6f899bf HAQ |
4079 | static void |
4080 | cmd_bigqtbuffer_size (char *own_buf) | |
4081 | { | |
4082 | ULONGEST val; | |
4083 | LONGEST sval; | |
4084 | char *packet = own_buf; | |
4085 | ||
4086 | /* Can't change the size during a tracing run. */ | |
4087 | if (tracing) | |
4088 | { | |
4089 | write_enn (own_buf); | |
4090 | return; | |
4091 | } | |
4092 | ||
4093 | packet += strlen ("QTBuffer:size:"); | |
4094 | ||
4095 | /* -1 is sent as literal "-1". */ | |
4096 | if (strcmp (packet, "-1") == 0) | |
4097 | sval = DEFAULT_TRACE_BUFFER_SIZE; | |
4098 | else | |
4099 | { | |
4100 | unpack_varlen_hex (packet, &val); | |
4101 | sval = (LONGEST) val; | |
4102 | } | |
4103 | ||
4104 | init_trace_buffer (sval); | |
4105 | trace_debug ("Trace buffer is now %s bytes", | |
4106 | plongest (trace_buffer_size)); | |
4107 | write_ok (own_buf); | |
4108 | } | |
4109 | ||
f196051f SS |
4110 | static void |
4111 | cmd_qtnotes (char *own_buf) | |
4112 | { | |
4113 | size_t nbytes; | |
4114 | char *saved, *user, *notes, *stopnote; | |
4115 | char *packet = own_buf; | |
4116 | ||
4117 | packet += strlen ("QTNotes:"); | |
4118 | ||
4119 | while (*packet) | |
4120 | { | |
61012eef | 4121 | if (startswith (packet, "user:")) |
f196051f SS |
4122 | { |
4123 | packet += strlen ("user:"); | |
4124 | saved = packet; | |
4125 | packet = strchr (packet, ';'); | |
4126 | nbytes = (packet - saved) / 2; | |
224c3ddb | 4127 | user = (char *) xmalloc (nbytes + 1); |
ff0e980e | 4128 | nbytes = hex2bin (saved, (gdb_byte *) user, nbytes); |
f196051f SS |
4129 | user[nbytes] = '\0'; |
4130 | ++packet; /* skip the semicolon */ | |
4131 | trace_debug ("User is '%s'", user); | |
8e1d55a3 | 4132 | xfree (tracing_user_name); |
f196051f SS |
4133 | tracing_user_name = user; |
4134 | } | |
61012eef | 4135 | else if (startswith (packet, "notes:")) |
f196051f SS |
4136 | { |
4137 | packet += strlen ("notes:"); | |
4138 | saved = packet; | |
4139 | packet = strchr (packet, ';'); | |
4140 | nbytes = (packet - saved) / 2; | |
224c3ddb | 4141 | notes = (char *) xmalloc (nbytes + 1); |
ff0e980e | 4142 | nbytes = hex2bin (saved, (gdb_byte *) notes, nbytes); |
f196051f SS |
4143 | notes[nbytes] = '\0'; |
4144 | ++packet; /* skip the semicolon */ | |
4145 | trace_debug ("Notes is '%s'", notes); | |
8e1d55a3 | 4146 | xfree (tracing_notes); |
f196051f SS |
4147 | tracing_notes = notes; |
4148 | } | |
61012eef | 4149 | else if (startswith (packet, "tstop:")) |
f196051f SS |
4150 | { |
4151 | packet += strlen ("tstop:"); | |
4152 | saved = packet; | |
4153 | packet = strchr (packet, ';'); | |
4154 | nbytes = (packet - saved) / 2; | |
224c3ddb | 4155 | stopnote = (char *) xmalloc (nbytes + 1); |
ff0e980e | 4156 | nbytes = hex2bin (saved, (gdb_byte *) stopnote, nbytes); |
f196051f SS |
4157 | stopnote[nbytes] = '\0'; |
4158 | ++packet; /* skip the semicolon */ | |
4159 | trace_debug ("tstop note is '%s'", stopnote); | |
8e1d55a3 | 4160 | xfree (tracing_stop_note); |
f196051f SS |
4161 | tracing_stop_note = stopnote; |
4162 | } | |
4163 | else | |
4164 | break; | |
4165 | } | |
4166 | ||
4167 | write_ok (own_buf); | |
4168 | } | |
4169 | ||
219f2f23 PA |
4170 | int |
4171 | handle_tracepoint_general_set (char *packet) | |
4172 | { | |
4173 | if (strcmp ("QTinit", packet) == 0) | |
4174 | { | |
4175 | cmd_qtinit (packet); | |
4176 | return 1; | |
4177 | } | |
61012eef | 4178 | else if (startswith (packet, "QTDP:")) |
219f2f23 PA |
4179 | { |
4180 | cmd_qtdp (packet); | |
4181 | return 1; | |
4182 | } | |
61012eef | 4183 | else if (startswith (packet, "QTDPsrc:")) |
219f2f23 PA |
4184 | { |
4185 | cmd_qtdpsrc (packet); | |
4186 | return 1; | |
4187 | } | |
61012eef | 4188 | else if (startswith (packet, "QTEnable:")) |
d248b706 KY |
4189 | { |
4190 | cmd_qtenable_disable (packet, 1); | |
4191 | return 1; | |
4192 | } | |
61012eef | 4193 | else if (startswith (packet, "QTDisable:")) |
d248b706 KY |
4194 | { |
4195 | cmd_qtenable_disable (packet, 0); | |
4196 | return 1; | |
4197 | } | |
61012eef | 4198 | else if (startswith (packet, "QTDV:")) |
219f2f23 PA |
4199 | { |
4200 | cmd_qtdv (packet); | |
4201 | return 1; | |
4202 | } | |
61012eef | 4203 | else if (startswith (packet, "QTro:")) |
219f2f23 PA |
4204 | { |
4205 | cmd_qtro (packet); | |
4206 | return 1; | |
4207 | } | |
4208 | else if (strcmp ("QTStart", packet) == 0) | |
4209 | { | |
4210 | cmd_qtstart (packet); | |
4211 | return 1; | |
4212 | } | |
4213 | else if (strcmp ("QTStop", packet) == 0) | |
4214 | { | |
4215 | cmd_qtstop (packet); | |
4216 | return 1; | |
4217 | } | |
61012eef | 4218 | else if (startswith (packet, "QTDisconnected:")) |
8336d594 PA |
4219 | { |
4220 | cmd_qtdisconnected (packet); | |
4221 | return 1; | |
4222 | } | |
61012eef | 4223 | else if (startswith (packet, "QTFrame:")) |
219f2f23 PA |
4224 | { |
4225 | cmd_qtframe (packet); | |
4226 | return 1; | |
4227 | } | |
61012eef | 4228 | else if (startswith (packet, "QTBuffer:circular:")) |
219f2f23 | 4229 | { |
277e4e52 | 4230 | cmd_bigqtbuffer_circular (packet); |
219f2f23 PA |
4231 | return 1; |
4232 | } | |
61012eef | 4233 | else if (startswith (packet, "QTBuffer:size:")) |
f6f899bf HAQ |
4234 | { |
4235 | cmd_bigqtbuffer_size (packet); | |
4236 | return 1; | |
4237 | } | |
61012eef | 4238 | else if (startswith (packet, "QTNotes:")) |
f196051f SS |
4239 | { |
4240 | cmd_qtnotes (packet); | |
4241 | return 1; | |
4242 | } | |
219f2f23 PA |
4243 | |
4244 | return 0; | |
4245 | } | |
4246 | ||
4247 | int | |
4248 | handle_tracepoint_query (char *packet) | |
4249 | { | |
4250 | if (strcmp ("qTStatus", packet) == 0) | |
4251 | { | |
4252 | cmd_qtstatus (packet); | |
4253 | return 1; | |
4254 | } | |
61012eef | 4255 | else if (startswith (packet, "qTP:")) |
f196051f SS |
4256 | { |
4257 | cmd_qtp (packet); | |
4258 | return 1; | |
4259 | } | |
219f2f23 PA |
4260 | else if (strcmp ("qTfP", packet) == 0) |
4261 | { | |
4262 | cmd_qtfp (packet); | |
4263 | return 1; | |
4264 | } | |
4265 | else if (strcmp ("qTsP", packet) == 0) | |
4266 | { | |
4267 | cmd_qtsp (packet); | |
4268 | return 1; | |
4269 | } | |
4270 | else if (strcmp ("qTfV", packet) == 0) | |
4271 | { | |
4272 | cmd_qtfv (packet); | |
4273 | return 1; | |
4274 | } | |
4275 | else if (strcmp ("qTsV", packet) == 0) | |
4276 | { | |
4277 | cmd_qtsv (packet); | |
4278 | return 1; | |
4279 | } | |
61012eef | 4280 | else if (startswith (packet, "qTV:")) |
219f2f23 PA |
4281 | { |
4282 | cmd_qtv (packet); | |
4283 | return 1; | |
4284 | } | |
61012eef | 4285 | else if (startswith (packet, "qTBuffer:")) |
219f2f23 PA |
4286 | { |
4287 | cmd_qtbuffer (packet); | |
4288 | return 1; | |
4289 | } | |
0fb4aa4b PA |
4290 | else if (strcmp ("qTfSTM", packet) == 0) |
4291 | { | |
4292 | cmd_qtfstm (packet); | |
4293 | return 1; | |
4294 | } | |
4295 | else if (strcmp ("qTsSTM", packet) == 0) | |
4296 | { | |
4297 | cmd_qtsstm (packet); | |
4298 | return 1; | |
4299 | } | |
61012eef | 4300 | else if (startswith (packet, "qTSTMat:")) |
0fb4aa4b PA |
4301 | { |
4302 | cmd_qtstmat (packet); | |
4303 | return 1; | |
4304 | } | |
405f8e94 SS |
4305 | else if (strcmp ("qTMinFTPILen", packet) == 0) |
4306 | { | |
4307 | cmd_qtminftpilen (packet); | |
4308 | return 1; | |
4309 | } | |
219f2f23 PA |
4310 | |
4311 | return 0; | |
4312 | } | |
4313 | ||
fa593d66 PA |
4314 | #endif |
4315 | #ifndef IN_PROCESS_AGENT | |
4316 | ||
219f2f23 PA |
4317 | /* Call this when thread TINFO has hit the tracepoint defined by |
4318 | TP_NUMBER and TP_ADDRESS, and that tracepoint has a while-stepping | |
4319 | action. This adds a while-stepping collecting state item to the | |
4320 | threads' collecting state list, so that we can keep track of | |
4321 | multiple simultaneous while-stepping actions being collected by the | |
4322 | same thread. This can happen in cases like: | |
4323 | ||
4324 | ff0001 INSN1 <-- TP1, while-stepping 10 collect $regs | |
4325 | ff0002 INSN2 | |
4326 | ff0003 INSN3 <-- TP2, collect $regs | |
4327 | ff0004 INSN4 <-- TP3, while-stepping 10 collect $regs | |
4328 | ff0005 INSN5 | |
4329 | ||
4330 | Notice that when instruction INSN5 is reached, the while-stepping | |
4331 | actions of both TP1 and TP3 are still being collected, and that TP2 | |
4332 | had been collected meanwhile. The whole range of ff0001-ff0005 | |
4333 | should be single-stepped, due to at least TP1's while-stepping | |
4334 | action covering the whole range. */ | |
4335 | ||
4336 | static void | |
4337 | add_while_stepping_state (struct thread_info *tinfo, | |
4338 | int tp_number, CORE_ADDR tp_address) | |
4339 | { | |
8d749320 | 4340 | struct wstep_state *wstep = XNEW (struct wstep_state); |
219f2f23 | 4341 | |
219f2f23 PA |
4342 | wstep->next = tinfo->while_stepping; |
4343 | ||
4344 | wstep->tp_number = tp_number; | |
4345 | wstep->tp_address = tp_address; | |
4346 | wstep->current_step = 0; | |
4347 | ||
4348 | tinfo->while_stepping = wstep; | |
4349 | } | |
4350 | ||
4351 | /* Release the while-stepping collecting state WSTEP. */ | |
4352 | ||
4353 | static void | |
4354 | release_while_stepping_state (struct wstep_state *wstep) | |
4355 | { | |
4356 | free (wstep); | |
4357 | } | |
4358 | ||
4359 | /* Release all while-stepping collecting states currently associated | |
4360 | with thread TINFO. */ | |
4361 | ||
4362 | void | |
4363 | release_while_stepping_state_list (struct thread_info *tinfo) | |
4364 | { | |
4365 | struct wstep_state *head; | |
4366 | ||
4367 | while (tinfo->while_stepping) | |
4368 | { | |
4369 | head = tinfo->while_stepping; | |
4370 | tinfo->while_stepping = head->next; | |
4371 | release_while_stepping_state (head); | |
4372 | } | |
4373 | } | |
4374 | ||
4375 | /* If TINFO was handling a 'while-stepping' action, the step has | |
4376 | finished, so collect any step data needed, and check if any more | |
4377 | steps are required. Return true if the thread was indeed | |
4378 | collecting tracepoint data, false otherwise. */ | |
4379 | ||
4380 | int | |
4381 | tracepoint_finished_step (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
4382 | { | |
4383 | struct tracepoint *tpoint; | |
4384 | struct wstep_state *wstep; | |
4385 | struct wstep_state **wstep_link; | |
4386 | struct trap_tracepoint_ctx ctx; | |
4387 | ||
fa593d66 PA |
4388 | /* Pull in fast tracepoint trace frames from the inferior lib buffer into |
4389 | our buffer. */ | |
58b4daa5 | 4390 | if (agent_loaded_p ()) |
fa593d66 PA |
4391 | upload_fast_traceframes (); |
4392 | ||
219f2f23 PA |
4393 | /* Check if we were indeed collecting data for one of more |
4394 | tracepoints with a 'while-stepping' count. */ | |
4395 | if (tinfo->while_stepping == NULL) | |
4396 | return 0; | |
4397 | ||
4398 | if (!tracing) | |
4399 | { | |
4400 | /* We're not even tracing anymore. Stop this thread from | |
4401 | collecting. */ | |
4402 | release_while_stepping_state_list (tinfo); | |
4403 | ||
4404 | /* The thread had stopped due to a single-step request indeed | |
4405 | explained by a tracepoint. */ | |
4406 | return 1; | |
4407 | } | |
4408 | ||
4409 | wstep = tinfo->while_stepping; | |
4410 | wstep_link = &tinfo->while_stepping; | |
4411 | ||
4412 | trace_debug ("Thread %s finished a single-step for tracepoint %d at 0x%s", | |
4413 | target_pid_to_str (tinfo->entry.id), | |
4414 | wstep->tp_number, paddress (wstep->tp_address)); | |
4415 | ||
fa593d66 | 4416 | ctx.base.type = trap_tracepoint; |
219f2f23 PA |
4417 | ctx.regcache = get_thread_regcache (tinfo, 1); |
4418 | ||
4419 | while (wstep != NULL) | |
4420 | { | |
4421 | tpoint = find_tracepoint (wstep->tp_number, wstep->tp_address); | |
4422 | if (tpoint == NULL) | |
4423 | { | |
4424 | trace_debug ("NO TRACEPOINT %d at 0x%s FOR THREAD %s!", | |
4425 | wstep->tp_number, paddress (wstep->tp_address), | |
4426 | target_pid_to_str (tinfo->entry.id)); | |
4427 | ||
4428 | /* Unlink. */ | |
4429 | *wstep_link = wstep->next; | |
4430 | release_while_stepping_state (wstep); | |
4f269b12 | 4431 | wstep = *wstep_link; |
219f2f23 PA |
4432 | continue; |
4433 | } | |
4434 | ||
4435 | /* We've just finished one step. */ | |
4436 | ++wstep->current_step; | |
4437 | ||
4438 | /* Collect data. */ | |
4439 | collect_data_at_step ((struct tracepoint_hit_ctx *) &ctx, | |
4440 | stop_pc, tpoint, wstep->current_step); | |
4441 | ||
4442 | if (wstep->current_step >= tpoint->step_count) | |
4443 | { | |
4444 | /* The requested numbers of steps have occurred. */ | |
4445 | trace_debug ("Thread %s done stepping for tracepoint %d at 0x%s", | |
4446 | target_pid_to_str (tinfo->entry.id), | |
4447 | wstep->tp_number, paddress (wstep->tp_address)); | |
4448 | ||
4449 | /* Unlink the wstep. */ | |
4450 | *wstep_link = wstep->next; | |
4451 | release_while_stepping_state (wstep); | |
4452 | wstep = *wstep_link; | |
4453 | ||
4454 | /* Only check the hit count now, which ensure that we do all | |
4455 | our stepping before stopping the run. */ | |
4456 | if (tpoint->pass_count > 0 | |
4457 | && tpoint->hit_count >= tpoint->pass_count | |
4458 | && stopping_tracepoint == NULL) | |
4459 | stopping_tracepoint = tpoint; | |
4460 | } | |
4461 | else | |
4462 | { | |
4463 | /* Keep single-stepping until the requested numbers of steps | |
4464 | have occurred. */ | |
4465 | wstep_link = &wstep->next; | |
4466 | wstep = *wstep_link; | |
4467 | } | |
4468 | ||
4469 | if (stopping_tracepoint | |
4470 | || trace_buffer_is_full | |
4471 | || expr_eval_result != expr_eval_no_error) | |
4472 | { | |
4473 | stop_tracing (); | |
4474 | break; | |
4475 | } | |
4476 | } | |
4477 | ||
4478 | return 1; | |
4479 | } | |
4480 | ||
fa593d66 PA |
4481 | /* Handle any internal tracing control breakpoint hits. That means, |
4482 | pull traceframes from the IPA to our buffer, and syncing both | |
4483 | tracing agents when the IPA's tracing stops for some reason. */ | |
4484 | ||
4485 | int | |
4486 | handle_tracepoint_bkpts (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
4487 | { | |
4488 | /* Pull in fast tracepoint trace frames from the inferior in-process | |
4489 | agent's buffer into our buffer. */ | |
4490 | ||
58b4daa5 | 4491 | if (!agent_loaded_p ()) |
fa593d66 PA |
4492 | return 0; |
4493 | ||
4494 | upload_fast_traceframes (); | |
4495 | ||
4496 | /* Check if the in-process agent had decided we should stop | |
4497 | tracing. */ | |
4498 | if (stop_pc == ipa_sym_addrs.addr_stop_tracing) | |
4499 | { | |
4500 | int ipa_trace_buffer_is_full; | |
4501 | CORE_ADDR ipa_stopping_tracepoint; | |
4502 | int ipa_expr_eval_result; | |
4503 | CORE_ADDR ipa_error_tracepoint; | |
4504 | ||
4505 | trace_debug ("lib stopped at stop_tracing"); | |
4506 | ||
4507 | read_inferior_integer (ipa_sym_addrs.addr_trace_buffer_is_full, | |
4508 | &ipa_trace_buffer_is_full); | |
4509 | ||
4510 | read_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, | |
4511 | &ipa_stopping_tracepoint); | |
4512 | write_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, 0); | |
4513 | ||
4514 | read_inferior_data_pointer (ipa_sym_addrs.addr_error_tracepoint, | |
4515 | &ipa_error_tracepoint); | |
4516 | write_inferior_data_pointer (ipa_sym_addrs.addr_error_tracepoint, 0); | |
4517 | ||
4518 | read_inferior_integer (ipa_sym_addrs.addr_expr_eval_result, | |
4519 | &ipa_expr_eval_result); | |
4520 | write_inferior_integer (ipa_sym_addrs.addr_expr_eval_result, 0); | |
4521 | ||
4522 | trace_debug ("lib: trace_buffer_is_full: %d, " | |
4523 | "stopping_tracepoint: %s, " | |
4524 | "ipa_expr_eval_result: %d, " | |
4525 | "error_tracepoint: %s, ", | |
4526 | ipa_trace_buffer_is_full, | |
4527 | paddress (ipa_stopping_tracepoint), | |
4528 | ipa_expr_eval_result, | |
4529 | paddress (ipa_error_tracepoint)); | |
4530 | ||
4531 | if (debug_threads) | |
4532 | { | |
4533 | if (ipa_trace_buffer_is_full) | |
4534 | trace_debug ("lib stopped due to full buffer."); | |
4535 | if (ipa_stopping_tracepoint) | |
4536 | trace_debug ("lib stopped due to tpoint"); | |
39b5a3b9 | 4537 | if (ipa_error_tracepoint) |
fa593d66 PA |
4538 | trace_debug ("lib stopped due to error"); |
4539 | } | |
4540 | ||
4541 | if (ipa_stopping_tracepoint != 0) | |
4542 | { | |
4543 | stopping_tracepoint | |
4544 | = fast_tracepoint_from_ipa_tpoint_address (ipa_stopping_tracepoint); | |
4545 | } | |
4546 | else if (ipa_expr_eval_result != expr_eval_no_error) | |
4547 | { | |
4548 | expr_eval_result = ipa_expr_eval_result; | |
4549 | error_tracepoint | |
4550 | = fast_tracepoint_from_ipa_tpoint_address (ipa_error_tracepoint); | |
4551 | } | |
4552 | stop_tracing (); | |
4553 | return 1; | |
4554 | } | |
4555 | else if (stop_pc == ipa_sym_addrs.addr_flush_trace_buffer) | |
4556 | { | |
4557 | trace_debug ("lib stopped at flush_trace_buffer"); | |
4558 | return 1; | |
4559 | } | |
4560 | ||
4561 | return 0; | |
4562 | } | |
4563 | ||
219f2f23 PA |
4564 | /* Return true if TINFO just hit a tracepoint. Collect data if |
4565 | so. */ | |
4566 | ||
4567 | int | |
4568 | tracepoint_was_hit (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
4569 | { | |
4570 | struct tracepoint *tpoint; | |
4571 | int ret = 0; | |
4572 | struct trap_tracepoint_ctx ctx; | |
4573 | ||
4574 | /* Not tracing, don't handle. */ | |
4575 | if (!tracing) | |
4576 | return 0; | |
4577 | ||
fa593d66 | 4578 | ctx.base.type = trap_tracepoint; |
219f2f23 PA |
4579 | ctx.regcache = get_thread_regcache (tinfo, 1); |
4580 | ||
4581 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
4582 | { | |
fa593d66 PA |
4583 | /* Note that we collect fast tracepoints here as well. We'll |
4584 | step over the fast tracepoint jump later, which avoids the | |
f72429c5 YQ |
4585 | double collect. However, we don't collect for static |
4586 | tracepoints here, because UST markers are compiled in program, | |
4587 | and probes will be executed in program. So static tracepoints | |
4588 | are collected there. */ | |
4589 | if (tpoint->enabled && stop_pc == tpoint->address | |
4590 | && tpoint->type != static_tracepoint) | |
219f2f23 PA |
4591 | { |
4592 | trace_debug ("Thread %s at address of tracepoint %d at 0x%s", | |
4593 | target_pid_to_str (tinfo->entry.id), | |
4594 | tpoint->number, paddress (tpoint->address)); | |
4595 | ||
4596 | /* Test the condition if present, and collect if true. */ | |
4597 | if (!tpoint->cond | |
4598 | || (condition_true_at_tracepoint | |
4599 | ((struct tracepoint_hit_ctx *) &ctx, tpoint))) | |
4600 | collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
4601 | stop_pc, tpoint); | |
4602 | ||
4603 | if (stopping_tracepoint | |
4604 | || trace_buffer_is_full | |
4605 | || expr_eval_result != expr_eval_no_error) | |
4606 | { | |
4607 | stop_tracing (); | |
4608 | } | |
4609 | /* If the tracepoint had a 'while-stepping' action, then set | |
4610 | the thread to collect this tracepoint on the following | |
4611 | single-steps. */ | |
4612 | else if (tpoint->step_count > 0) | |
4613 | { | |
4614 | add_while_stepping_state (tinfo, | |
4615 | tpoint->number, tpoint->address); | |
4616 | } | |
4617 | ||
4618 | ret = 1; | |
4619 | } | |
4620 | } | |
4621 | ||
4622 | return ret; | |
4623 | } | |
4624 | ||
fa593d66 PA |
4625 | #endif |
4626 | ||
0fb4aa4b PA |
4627 | #if defined IN_PROCESS_AGENT && defined HAVE_UST |
4628 | struct ust_marker_data; | |
4629 | static void collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
0fb4aa4b PA |
4630 | struct traceframe *tframe); |
4631 | #endif | |
4632 | ||
219f2f23 PA |
4633 | /* Create a trace frame for the hit of the given tracepoint in the |
4634 | given thread. */ | |
4635 | ||
4636 | static void | |
4637 | collect_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, CORE_ADDR stop_pc, | |
4638 | struct tracepoint *tpoint) | |
4639 | { | |
4640 | struct traceframe *tframe; | |
4641 | int acti; | |
4642 | ||
4643 | /* Only count it as a hit when we actually collect data. */ | |
4644 | tpoint->hit_count++; | |
4645 | ||
4646 | /* If we've exceeded a defined pass count, record the event for | |
4647 | later, and finish the collection for this hit. This test is only | |
4648 | for nonstepping tracepoints, stepping tracepoints test at the end | |
4649 | of their while-stepping loop. */ | |
4650 | if (tpoint->pass_count > 0 | |
4651 | && tpoint->hit_count >= tpoint->pass_count | |
4652 | && tpoint->step_count == 0 | |
4653 | && stopping_tracepoint == NULL) | |
4654 | stopping_tracepoint = tpoint; | |
4655 | ||
5f18041e | 4656 | trace_debug ("Making new traceframe for tracepoint %d at 0x%s, hit %" PRIu64, |
219f2f23 PA |
4657 | tpoint->number, paddress (tpoint->address), tpoint->hit_count); |
4658 | ||
4659 | tframe = add_traceframe (tpoint); | |
4660 | ||
4661 | if (tframe) | |
4662 | { | |
4663 | for (acti = 0; acti < tpoint->numactions; ++acti) | |
4664 | { | |
fa593d66 | 4665 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
4666 | trace_debug ("Tracepoint %d at 0x%s about to do action '%s'", |
4667 | tpoint->number, paddress (tpoint->address), | |
4668 | tpoint->actions_str[acti]); | |
fa593d66 | 4669 | #endif |
219f2f23 PA |
4670 | |
4671 | do_action_at_tracepoint (ctx, stop_pc, tpoint, tframe, | |
4672 | tpoint->actions[acti]); | |
4673 | } | |
4674 | ||
4675 | finish_traceframe (tframe); | |
4676 | } | |
4677 | ||
4678 | if (tframe == NULL && tracing) | |
4679 | trace_buffer_is_full = 1; | |
4680 | } | |
4681 | ||
fa593d66 PA |
4682 | #ifndef IN_PROCESS_AGENT |
4683 | ||
219f2f23 PA |
4684 | static void |
4685 | collect_data_at_step (struct tracepoint_hit_ctx *ctx, | |
4686 | CORE_ADDR stop_pc, | |
4687 | struct tracepoint *tpoint, int current_step) | |
4688 | { | |
4689 | struct traceframe *tframe; | |
4690 | int acti; | |
4691 | ||
4692 | trace_debug ("Making new step traceframe for " | |
5f18041e | 4693 | "tracepoint %d at 0x%s, step %d of %" PRIu64 ", hit %" PRIu64, |
219f2f23 PA |
4694 | tpoint->number, paddress (tpoint->address), |
4695 | current_step, tpoint->step_count, | |
4696 | tpoint->hit_count); | |
4697 | ||
4698 | tframe = add_traceframe (tpoint); | |
4699 | ||
4700 | if (tframe) | |
4701 | { | |
4702 | for (acti = 0; acti < tpoint->num_step_actions; ++acti) | |
4703 | { | |
4704 | trace_debug ("Tracepoint %d at 0x%s about to do step action '%s'", | |
4705 | tpoint->number, paddress (tpoint->address), | |
4706 | tpoint->step_actions_str[acti]); | |
4707 | ||
4708 | do_action_at_tracepoint (ctx, stop_pc, tpoint, tframe, | |
4709 | tpoint->step_actions[acti]); | |
4710 | } | |
4711 | ||
4712 | finish_traceframe (tframe); | |
4713 | } | |
4714 | ||
4715 | if (tframe == NULL && tracing) | |
4716 | trace_buffer_is_full = 1; | |
4717 | } | |
4718 | ||
fa593d66 PA |
4719 | #endif |
4720 | ||
3aee8918 | 4721 | #ifdef IN_PROCESS_AGENT |
ae91f625 MK |
4722 | /* The target description index for IPA. Passed from gdbserver, used |
4723 | to select ipa_tdesc. */ | |
4724 | EXTERN_C_PUSH | |
4725 | IP_AGENT_EXPORT_VAR int ipa_tdesc_idx; | |
4726 | EXTERN_C_POP | |
3aee8918 PA |
4727 | #endif |
4728 | ||
219f2f23 PA |
4729 | static struct regcache * |
4730 | get_context_regcache (struct tracepoint_hit_ctx *ctx) | |
4731 | { | |
fa593d66 | 4732 | struct regcache *regcache = NULL; |
fa593d66 | 4733 | #ifdef IN_PROCESS_AGENT |
ae91f625 MK |
4734 | const struct target_desc *ipa_tdesc = get_ipa_tdesc (ipa_tdesc_idx); |
4735 | ||
fa593d66 PA |
4736 | if (ctx->type == fast_tracepoint) |
4737 | { | |
4738 | struct fast_tracepoint_ctx *fctx = (struct fast_tracepoint_ctx *) ctx; | |
4739 | if (!fctx->regcache_initted) | |
4740 | { | |
4741 | fctx->regcache_initted = 1; | |
3aee8918 | 4742 | init_register_cache (&fctx->regcache, ipa_tdesc, fctx->regspace); |
fa593d66 PA |
4743 | supply_regblock (&fctx->regcache, NULL); |
4744 | supply_fast_tracepoint_registers (&fctx->regcache, fctx->regs); | |
4745 | } | |
4746 | regcache = &fctx->regcache; | |
4747 | } | |
0fb4aa4b PA |
4748 | #ifdef HAVE_UST |
4749 | if (ctx->type == static_tracepoint) | |
4750 | { | |
493e2a69 MS |
4751 | struct static_tracepoint_ctx *sctx |
4752 | = (struct static_tracepoint_ctx *) ctx; | |
4753 | ||
0fb4aa4b PA |
4754 | if (!sctx->regcache_initted) |
4755 | { | |
4756 | sctx->regcache_initted = 1; | |
3aee8918 | 4757 | init_register_cache (&sctx->regcache, ipa_tdesc, sctx->regspace); |
0fb4aa4b PA |
4758 | supply_regblock (&sctx->regcache, NULL); |
4759 | /* Pass down the tracepoint address, because REGS doesn't | |
4760 | include the PC, but we know what it must have been. */ | |
4761 | supply_static_tracepoint_registers (&sctx->regcache, | |
4762 | (const unsigned char *) | |
4763 | sctx->regs, | |
4764 | sctx->tpoint->address); | |
4765 | } | |
4766 | regcache = &sctx->regcache; | |
4767 | } | |
4768 | #endif | |
fa593d66 PA |
4769 | #else |
4770 | if (ctx->type == trap_tracepoint) | |
4771 | { | |
4772 | struct trap_tracepoint_ctx *tctx = (struct trap_tracepoint_ctx *) ctx; | |
4773 | regcache = tctx->regcache; | |
4774 | } | |
4775 | #endif | |
219f2f23 PA |
4776 | |
4777 | gdb_assert (regcache != NULL); | |
4778 | ||
4779 | return regcache; | |
4780 | } | |
4781 | ||
4782 | static void | |
4783 | do_action_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
4784 | CORE_ADDR stop_pc, | |
4785 | struct tracepoint *tpoint, | |
4786 | struct traceframe *tframe, | |
4787 | struct tracepoint_action *taction) | |
4788 | { | |
4789 | enum eval_result_type err; | |
4790 | ||
4791 | switch (taction->type) | |
4792 | { | |
4793 | case 'M': | |
4794 | { | |
4795 | struct collect_memory_action *maction; | |
5ae4861a | 4796 | struct eval_agent_expr_context ax_ctx; |
219f2f23 PA |
4797 | |
4798 | maction = (struct collect_memory_action *) taction; | |
5ae4861a YQ |
4799 | ax_ctx.regcache = NULL; |
4800 | ax_ctx.tframe = tframe; | |
4801 | ax_ctx.tpoint = tpoint; | |
219f2f23 PA |
4802 | |
4803 | trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)", | |
4804 | pulongest (maction->len), | |
4805 | paddress (maction->addr), maction->basereg); | |
4806 | /* (should use basereg) */ | |
5ae4861a YQ |
4807 | agent_mem_read (&ax_ctx, NULL, (CORE_ADDR) maction->addr, |
4808 | maction->len); | |
219f2f23 PA |
4809 | break; |
4810 | } | |
4811 | case 'R': | |
4812 | { | |
219f2f23 PA |
4813 | unsigned char *regspace; |
4814 | struct regcache tregcache; | |
4815 | struct regcache *context_regcache; | |
3aee8918 | 4816 | int regcache_size; |
219f2f23 PA |
4817 | |
4818 | trace_debug ("Want to collect registers"); | |
4819 | ||
3aee8918 PA |
4820 | context_regcache = get_context_regcache (ctx); |
4821 | regcache_size = register_cache_size (context_regcache->tdesc); | |
4822 | ||
219f2f23 | 4823 | /* Collect all registers for now. */ |
3aee8918 | 4824 | regspace = add_traceframe_block (tframe, tpoint, 1 + regcache_size); |
219f2f23 PA |
4825 | if (regspace == NULL) |
4826 | { | |
4827 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
4828 | break; | |
4829 | } | |
4830 | /* Identify a register block. */ | |
4831 | *regspace = 'R'; | |
4832 | ||
219f2f23 PA |
4833 | /* Wrap the regblock in a register cache (in the stack, we |
4834 | don't want to malloc here). */ | |
3aee8918 PA |
4835 | init_register_cache (&tregcache, context_regcache->tdesc, |
4836 | regspace + 1); | |
219f2f23 PA |
4837 | |
4838 | /* Copy the register data to the regblock. */ | |
4839 | regcache_cpy (&tregcache, context_regcache); | |
4840 | ||
fa593d66 | 4841 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
4842 | /* On some platforms, trap-based tracepoints will have the PC |
4843 | pointing to the next instruction after the trap, but we | |
4844 | don't want the user or GDB trying to guess whether the | |
4845 | saved PC needs adjusting; so always record the adjusted | |
4846 | stop_pc. Note that we can't use tpoint->address instead, | |
fa593d66 PA |
4847 | since it will be wrong for while-stepping actions. This |
4848 | adjustment is a nop for fast tracepoints collected from the | |
4849 | in-process lib (but not if GDBserver is collecting one | |
4850 | preemptively), since the PC had already been adjusted to | |
4851 | contain the tracepoint's address by the jump pad. */ | |
219f2f23 | 4852 | trace_debug ("Storing stop pc (0x%s) in regblock", |
8d00225b | 4853 | paddress (stop_pc)); |
219f2f23 PA |
4854 | |
4855 | /* This changes the regblock, not the thread's | |
4856 | regcache. */ | |
4857 | regcache_write_pc (&tregcache, stop_pc); | |
fa593d66 | 4858 | #endif |
219f2f23 PA |
4859 | } |
4860 | break; | |
4861 | case 'X': | |
4862 | { | |
4863 | struct eval_expr_action *eaction; | |
5ae4861a | 4864 | struct eval_agent_expr_context ax_ctx; |
219f2f23 PA |
4865 | |
4866 | eaction = (struct eval_expr_action *) taction; | |
5ae4861a YQ |
4867 | ax_ctx.regcache = get_context_regcache (ctx); |
4868 | ax_ctx.tframe = tframe; | |
4869 | ax_ctx.tpoint = tpoint; | |
219f2f23 PA |
4870 | |
4871 | trace_debug ("Want to evaluate expression"); | |
4872 | ||
5ae4861a | 4873 | err = gdb_eval_agent_expr (&ax_ctx, eaction->expr, NULL); |
219f2f23 PA |
4874 | |
4875 | if (err != expr_eval_no_error) | |
4876 | { | |
4877 | record_tracepoint_error (tpoint, "action expression", err); | |
4878 | return; | |
4879 | } | |
4880 | } | |
4881 | break; | |
0fb4aa4b PA |
4882 | case 'L': |
4883 | { | |
4884 | #if defined IN_PROCESS_AGENT && defined HAVE_UST | |
4885 | trace_debug ("Want to collect static trace data"); | |
19560ba5 | 4886 | collect_ust_data_at_tracepoint (ctx, tframe); |
0fb4aa4b PA |
4887 | #else |
4888 | trace_debug ("warning: collecting static trace data, " | |
4889 | "but static tracepoints are not supported"); | |
4890 | #endif | |
4891 | } | |
4892 | break; | |
219f2f23 PA |
4893 | default: |
4894 | trace_debug ("unknown trace action '%c', ignoring", taction->type); | |
4895 | break; | |
4896 | } | |
4897 | } | |
4898 | ||
4899 | static int | |
4900 | condition_true_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
4901 | struct tracepoint *tpoint) | |
4902 | { | |
4903 | ULONGEST value = 0; | |
4904 | enum eval_result_type err; | |
4905 | ||
c6beb2cb PA |
4906 | /* Presently, gdbserver doesn't run compiled conditions, only the |
4907 | IPA does. If the program stops at a fast tracepoint's address | |
4908 | (e.g., due to a breakpoint, trap tracepoint, or stepping), | |
4909 | gdbserver preemptively collect the fast tracepoint. Later, on | |
4910 | resume, gdbserver steps over the fast tracepoint like it steps | |
4911 | over breakpoints, so that the IPA doesn't see that fast | |
4912 | tracepoint. This avoids double collects of fast tracepoints in | |
4913 | that stopping scenario. Having gdbserver itself handle the fast | |
4914 | tracepoint gives the user a consistent view of when fast or trap | |
4915 | tracepoints are collected, compared to an alternative where only | |
4916 | trap tracepoints are collected on stop, and fast tracepoints on | |
4917 | resume. When a fast tracepoint is being processed by gdbserver, | |
4918 | it is always the non-compiled condition expression that is | |
4919 | used. */ | |
4920 | #ifdef IN_PROCESS_AGENT | |
6a271cae | 4921 | if (tpoint->compiled_cond) |
d78908cf WW |
4922 | { |
4923 | struct fast_tracepoint_ctx *fctx = (struct fast_tracepoint_ctx *) ctx; | |
4924 | err = ((condfn) (uintptr_t) (tpoint->compiled_cond)) (fctx->regs, &value); | |
4925 | } | |
6a271cae | 4926 | else |
c6beb2cb | 4927 | #endif |
5ae4861a YQ |
4928 | { |
4929 | struct eval_agent_expr_context ax_ctx; | |
219f2f23 | 4930 | |
5ae4861a YQ |
4931 | ax_ctx.regcache = get_context_regcache (ctx); |
4932 | ax_ctx.tframe = NULL; | |
4933 | ax_ctx.tpoint = tpoint; | |
4934 | ||
4935 | err = gdb_eval_agent_expr (&ax_ctx, tpoint->cond, &value); | |
4936 | } | |
219f2f23 PA |
4937 | if (err != expr_eval_no_error) |
4938 | { | |
4939 | record_tracepoint_error (tpoint, "condition", err); | |
4940 | /* The error case must return false. */ | |
4941 | return 0; | |
4942 | } | |
4943 | ||
4944 | trace_debug ("Tracepoint %d at 0x%s condition evals to %s", | |
4945 | tpoint->number, paddress (tpoint->address), | |
4946 | pulongest (value)); | |
4947 | return (value ? 1 : 0); | |
4948 | } | |
4949 | ||
219f2f23 PA |
4950 | /* Do memory copies for bytecodes. */ |
4951 | /* Do the recording of memory blocks for actions and bytecodes. */ | |
4952 | ||
5e1dc496 | 4953 | int |
5ae4861a | 4954 | agent_mem_read (struct eval_agent_expr_context *ctx, |
219f2f23 PA |
4955 | unsigned char *to, CORE_ADDR from, ULONGEST len) |
4956 | { | |
4957 | unsigned char *mspace; | |
4958 | ULONGEST remaining = len; | |
4959 | unsigned short blocklen; | |
4960 | ||
4961 | /* If a 'to' buffer is specified, use it. */ | |
4962 | if (to != NULL) | |
4963 | { | |
4964 | read_inferior_memory (from, to, len); | |
4965 | return 0; | |
4966 | } | |
4967 | ||
4968 | /* Otherwise, create a new memory block in the trace buffer. */ | |
4969 | while (remaining > 0) | |
4970 | { | |
4971 | size_t sp; | |
4972 | ||
4973 | blocklen = (remaining > 65535 ? 65535 : remaining); | |
4974 | sp = 1 + sizeof (from) + sizeof (blocklen) + blocklen; | |
5ae4861a | 4975 | mspace = add_traceframe_block (ctx->tframe, ctx->tpoint, sp); |
219f2f23 PA |
4976 | if (mspace == NULL) |
4977 | return 1; | |
4978 | /* Identify block as a memory block. */ | |
4979 | *mspace = 'M'; | |
4980 | ++mspace; | |
4981 | /* Record address and size. */ | |
4982 | memcpy (mspace, &from, sizeof (from)); | |
4983 | mspace += sizeof (from); | |
4984 | memcpy (mspace, &blocklen, sizeof (blocklen)); | |
4985 | mspace += sizeof (blocklen); | |
4986 | /* Record the memory block proper. */ | |
4987 | read_inferior_memory (from, mspace, blocklen); | |
4988 | trace_debug ("%d bytes recorded", blocklen); | |
4989 | remaining -= blocklen; | |
4990 | from += blocklen; | |
4991 | } | |
4992 | return 0; | |
4993 | } | |
4994 | ||
5e1dc496 | 4995 | int |
5ae4861a | 4996 | agent_mem_read_string (struct eval_agent_expr_context *ctx, |
3065dfb6 SS |
4997 | unsigned char *to, CORE_ADDR from, ULONGEST len) |
4998 | { | |
4999 | unsigned char *buf, *mspace; | |
5000 | ULONGEST remaining = len; | |
5001 | unsigned short blocklen, i; | |
5002 | ||
5003 | /* To save a bit of space, block lengths are 16-bit, so break large | |
5004 | requests into multiple blocks. Bordering on overkill for strings, | |
5005 | but it could happen that someone specifies a large max length. */ | |
5006 | while (remaining > 0) | |
5007 | { | |
5008 | size_t sp; | |
5009 | ||
5010 | blocklen = (remaining > 65535 ? 65535 : remaining); | |
5011 | /* We want working space to accumulate nonzero bytes, since | |
5012 | traceframes must have a predecided size (otherwise it gets | |
5013 | harder to wrap correctly for the circular case, etc). */ | |
5014 | buf = (unsigned char *) xmalloc (blocklen + 1); | |
5015 | for (i = 0; i < blocklen; ++i) | |
5016 | { | |
5017 | /* Read the string one byte at a time, in case the string is | |
5018 | at the end of a valid memory area - we don't want a | |
5019 | correctly-terminated string to engender segvio | |
5020 | complaints. */ | |
5021 | read_inferior_memory (from + i, buf + i, 1); | |
5022 | ||
5023 | if (buf[i] == '\0') | |
5024 | { | |
5025 | blocklen = i + 1; | |
5026 | /* Make sure outer loop stops now too. */ | |
5027 | remaining = blocklen; | |
5028 | break; | |
5029 | } | |
5030 | } | |
5031 | sp = 1 + sizeof (from) + sizeof (blocklen) + blocklen; | |
5ae4861a | 5032 | mspace = add_traceframe_block (ctx->tframe, ctx->tpoint, sp); |
3065dfb6 SS |
5033 | if (mspace == NULL) |
5034 | { | |
5035 | xfree (buf); | |
5036 | return 1; | |
5037 | } | |
5038 | /* Identify block as a memory block. */ | |
5039 | *mspace = 'M'; | |
5040 | ++mspace; | |
5041 | /* Record address and size. */ | |
5042 | memcpy ((void *) mspace, (void *) &from, sizeof (from)); | |
5043 | mspace += sizeof (from); | |
5044 | memcpy ((void *) mspace, (void *) &blocklen, sizeof (blocklen)); | |
5045 | mspace += sizeof (blocklen); | |
5046 | /* Copy the string contents. */ | |
5047 | memcpy ((void *) mspace, (void *) buf, blocklen); | |
5048 | remaining -= blocklen; | |
5049 | from += blocklen; | |
5050 | xfree (buf); | |
5051 | } | |
5052 | return 0; | |
5053 | } | |
5054 | ||
219f2f23 PA |
5055 | /* Record the value of a trace state variable. */ |
5056 | ||
5e1dc496 | 5057 | int |
5ae4861a | 5058 | agent_tsv_read (struct eval_agent_expr_context *ctx, int n) |
219f2f23 PA |
5059 | { |
5060 | unsigned char *vspace; | |
5061 | LONGEST val; | |
5062 | ||
5ae4861a | 5063 | vspace = add_traceframe_block (ctx->tframe, ctx->tpoint, |
219f2f23 PA |
5064 | 1 + sizeof (n) + sizeof (LONGEST)); |
5065 | if (vspace == NULL) | |
5066 | return 1; | |
5067 | /* Identify block as a variable. */ | |
5068 | *vspace = 'V'; | |
5069 | /* Record variable's number and value. */ | |
5070 | memcpy (vspace + 1, &n, sizeof (n)); | |
5071 | val = get_trace_state_variable_value (n); | |
5072 | memcpy (vspace + 1 + sizeof (n), &val, sizeof (val)); | |
5073 | trace_debug ("Variable %d recorded", n); | |
5074 | return 0; | |
5075 | } | |
5076 | ||
fa593d66 PA |
5077 | #ifndef IN_PROCESS_AGENT |
5078 | ||
b3b9301e PA |
5079 | /* Callback for traceframe_walk_blocks, used to find a given block |
5080 | type in a traceframe. */ | |
5081 | ||
5082 | static int | |
5083 | match_blocktype (char blocktype, unsigned char *dataptr, void *data) | |
5084 | { | |
9a3c8263 | 5085 | char *wantedp = (char *) data; |
b3b9301e PA |
5086 | |
5087 | if (*wantedp == blocktype) | |
5088 | return 1; | |
5089 | ||
5090 | return 0; | |
5091 | } | |
5092 | ||
5093 | /* Walk over all traceframe blocks of the traceframe buffer starting | |
5094 | at DATABASE, of DATASIZE bytes long, and call CALLBACK for each | |
5095 | block found, passing in DATA unmodified. If CALLBACK returns true, | |
5096 | this returns a pointer to where the block is found. Returns NULL | |
5097 | if no callback call returned true, indicating that all blocks have | |
5098 | been walked. */ | |
5099 | ||
219f2f23 | 5100 | static unsigned char * |
b3b9301e PA |
5101 | traceframe_walk_blocks (unsigned char *database, unsigned int datasize, |
5102 | int tfnum, | |
5103 | int (*callback) (char blocktype, | |
5104 | unsigned char *dataptr, | |
5105 | void *data), | |
5106 | void *data) | |
219f2f23 PA |
5107 | { |
5108 | unsigned char *dataptr; | |
5109 | ||
5110 | if (datasize == 0) | |
5111 | { | |
5112 | trace_debug ("traceframe %d has no data", tfnum); | |
5113 | return NULL; | |
5114 | } | |
5115 | ||
5116 | /* Iterate through a traceframe's blocks, looking for a block of the | |
5117 | requested type. */ | |
5118 | for (dataptr = database; | |
5119 | dataptr < database + datasize; | |
5120 | /* nothing */) | |
5121 | { | |
5122 | char blocktype; | |
5123 | unsigned short mlen; | |
5124 | ||
5125 | if (dataptr == trace_buffer_wrap) | |
5126 | { | |
5127 | /* Adjust to reflect wrapping part of the frame around to | |
5128 | the beginning. */ | |
5129 | datasize = dataptr - database; | |
5130 | dataptr = database = trace_buffer_lo; | |
5131 | } | |
b3b9301e | 5132 | |
219f2f23 PA |
5133 | blocktype = *dataptr++; |
5134 | ||
b3b9301e | 5135 | if ((*callback) (blocktype, dataptr, data)) |
219f2f23 PA |
5136 | return dataptr; |
5137 | ||
5138 | switch (blocktype) | |
5139 | { | |
5140 | case 'R': | |
5141 | /* Skip over the registers block. */ | |
3aee8918 | 5142 | dataptr += current_target_desc ()->registers_size; |
219f2f23 PA |
5143 | break; |
5144 | case 'M': | |
5145 | /* Skip over the memory block. */ | |
5146 | dataptr += sizeof (CORE_ADDR); | |
5147 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5148 | dataptr += (sizeof (mlen) + mlen); | |
5149 | break; | |
219f2f23 PA |
5150 | case 'V': |
5151 | /* Skip over the TSV block. */ | |
5152 | dataptr += (sizeof (int) + sizeof (LONGEST)); | |
5153 | break; | |
0fb4aa4b PA |
5154 | case 'S': |
5155 | /* Skip over the static trace data block. */ | |
5156 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5157 | dataptr += (sizeof (mlen) + mlen); | |
5158 | break; | |
219f2f23 PA |
5159 | default: |
5160 | trace_debug ("traceframe %d has unknown block type 0x%x", | |
5161 | tfnum, blocktype); | |
5162 | return NULL; | |
5163 | } | |
5164 | } | |
5165 | ||
5166 | return NULL; | |
5167 | } | |
5168 | ||
b3b9301e PA |
5169 | /* Look for the block of type TYPE_WANTED in the trameframe starting |
5170 | at DATABASE of DATASIZE bytes long. TFNUM is the traceframe | |
5171 | number. */ | |
5172 | ||
5173 | static unsigned char * | |
5174 | traceframe_find_block_type (unsigned char *database, unsigned int datasize, | |
5175 | int tfnum, char type_wanted) | |
5176 | { | |
5177 | return traceframe_walk_blocks (database, datasize, tfnum, | |
5178 | match_blocktype, &type_wanted); | |
5179 | } | |
5180 | ||
219f2f23 PA |
5181 | static unsigned char * |
5182 | traceframe_find_regblock (struct traceframe *tframe, int tfnum) | |
5183 | { | |
5184 | unsigned char *regblock; | |
5185 | ||
5186 | regblock = traceframe_find_block_type (tframe->data, | |
5187 | tframe->data_size, | |
5188 | tfnum, 'R'); | |
5189 | ||
5190 | if (regblock == NULL) | |
5191 | trace_debug ("traceframe %d has no register data", tfnum); | |
5192 | ||
5193 | return regblock; | |
5194 | } | |
5195 | ||
5196 | /* Get registers from a traceframe. */ | |
5197 | ||
5198 | int | |
5199 | fetch_traceframe_registers (int tfnum, struct regcache *regcache, int regnum) | |
5200 | { | |
5201 | unsigned char *dataptr; | |
5202 | struct tracepoint *tpoint; | |
5203 | struct traceframe *tframe; | |
5204 | ||
5205 | tframe = find_traceframe (tfnum); | |
5206 | ||
5207 | if (tframe == NULL) | |
5208 | { | |
5209 | trace_debug ("traceframe %d not found", tfnum); | |
5210 | return 1; | |
5211 | } | |
5212 | ||
5213 | dataptr = traceframe_find_regblock (tframe, tfnum); | |
5214 | if (dataptr == NULL) | |
5215 | { | |
1c79eb8a | 5216 | /* Mark registers unavailable. */ |
219f2f23 PA |
5217 | supply_regblock (regcache, NULL); |
5218 | ||
5219 | /* We can generally guess at a PC, although this will be | |
5220 | misleading for while-stepping frames and multi-location | |
5221 | tracepoints. */ | |
5222 | tpoint = find_next_tracepoint_by_number (NULL, tframe->tpnum); | |
5223 | if (tpoint != NULL) | |
5224 | regcache_write_pc (regcache, tpoint->address); | |
5225 | } | |
5226 | else | |
5227 | supply_regblock (regcache, dataptr); | |
5228 | ||
5229 | return 0; | |
5230 | } | |
5231 | ||
5232 | static CORE_ADDR | |
5233 | traceframe_get_pc (struct traceframe *tframe) | |
5234 | { | |
5235 | struct regcache regcache; | |
5236 | unsigned char *dataptr; | |
3aee8918 | 5237 | const struct target_desc *tdesc = current_target_desc (); |
219f2f23 PA |
5238 | |
5239 | dataptr = traceframe_find_regblock (tframe, -1); | |
5240 | if (dataptr == NULL) | |
5241 | return 0; | |
5242 | ||
3aee8918 | 5243 | init_register_cache (®cache, tdesc, dataptr); |
219f2f23 PA |
5244 | return regcache_read_pc (®cache); |
5245 | } | |
5246 | ||
5247 | /* Read a requested block of memory from a trace frame. */ | |
5248 | ||
5249 | int | |
5250 | traceframe_read_mem (int tfnum, CORE_ADDR addr, | |
5251 | unsigned char *buf, ULONGEST length, | |
5252 | ULONGEST *nbytes) | |
5253 | { | |
5254 | struct traceframe *tframe; | |
5255 | unsigned char *database, *dataptr; | |
5256 | unsigned int datasize; | |
5257 | CORE_ADDR maddr; | |
5258 | unsigned short mlen; | |
5259 | ||
5260 | trace_debug ("traceframe_read_mem"); | |
5261 | ||
5262 | tframe = find_traceframe (tfnum); | |
5263 | ||
5264 | if (!tframe) | |
5265 | { | |
5266 | trace_debug ("traceframe %d not found", tfnum); | |
5267 | return 1; | |
5268 | } | |
5269 | ||
5270 | datasize = tframe->data_size; | |
5271 | database = dataptr = &tframe->data[0]; | |
5272 | ||
5273 | /* Iterate through a traceframe's blocks, looking for memory. */ | |
5274 | while ((dataptr = traceframe_find_block_type (dataptr, | |
493e2a69 MS |
5275 | datasize |
5276 | - (dataptr - database), | |
219f2f23 PA |
5277 | tfnum, 'M')) != NULL) |
5278 | { | |
5279 | memcpy (&maddr, dataptr, sizeof (maddr)); | |
5280 | dataptr += sizeof (maddr); | |
5281 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5282 | dataptr += sizeof (mlen); | |
5283 | trace_debug ("traceframe %d has %d bytes at %s", | |
5284 | tfnum, mlen, paddress (maddr)); | |
5285 | ||
764880b7 PA |
5286 | /* If the block includes the first part of the desired range, |
5287 | return as much it has; GDB will re-request the remainder, | |
5288 | which might be in a different block of this trace frame. */ | |
5289 | if (maddr <= addr && addr < (maddr + mlen)) | |
219f2f23 | 5290 | { |
764880b7 PA |
5291 | ULONGEST amt = (maddr + mlen) - addr; |
5292 | if (amt > length) | |
5293 | amt = length; | |
5294 | ||
5295 | memcpy (buf, dataptr + (addr - maddr), amt); | |
5296 | *nbytes = amt; | |
219f2f23 PA |
5297 | return 0; |
5298 | } | |
5299 | ||
5300 | /* Skip over this block. */ | |
5301 | dataptr += mlen; | |
5302 | } | |
5303 | ||
5304 | trace_debug ("traceframe %d has no memory data for the desired region", | |
5305 | tfnum); | |
5306 | ||
5307 | *nbytes = 0; | |
5308 | return 0; | |
5309 | } | |
5310 | ||
5311 | static int | |
5312 | traceframe_read_tsv (int tsvnum, LONGEST *val) | |
5313 | { | |
5314 | int tfnum; | |
5315 | struct traceframe *tframe; | |
5316 | unsigned char *database, *dataptr; | |
5317 | unsigned int datasize; | |
5318 | int vnum; | |
8ddb1965 | 5319 | int found = 0; |
219f2f23 PA |
5320 | |
5321 | trace_debug ("traceframe_read_tsv"); | |
5322 | ||
5323 | tfnum = current_traceframe; | |
5324 | ||
5325 | if (tfnum < 0) | |
5326 | { | |
5327 | trace_debug ("no current traceframe"); | |
5328 | return 1; | |
5329 | } | |
5330 | ||
5331 | tframe = find_traceframe (tfnum); | |
5332 | ||
5333 | if (tframe == NULL) | |
5334 | { | |
5335 | trace_debug ("traceframe %d not found", tfnum); | |
5336 | return 1; | |
5337 | } | |
5338 | ||
5339 | datasize = tframe->data_size; | |
5340 | database = dataptr = &tframe->data[0]; | |
5341 | ||
8ddb1965 YQ |
5342 | /* Iterate through a traceframe's blocks, looking for the last |
5343 | matched tsv. */ | |
219f2f23 | 5344 | while ((dataptr = traceframe_find_block_type (dataptr, |
493e2a69 MS |
5345 | datasize |
5346 | - (dataptr - database), | |
219f2f23 PA |
5347 | tfnum, 'V')) != NULL) |
5348 | { | |
5349 | memcpy (&vnum, dataptr, sizeof (vnum)); | |
5350 | dataptr += sizeof (vnum); | |
5351 | ||
5352 | trace_debug ("traceframe %d has variable %d", tfnum, vnum); | |
5353 | ||
5354 | /* Check that this is the variable we want. */ | |
5355 | if (tsvnum == vnum) | |
5356 | { | |
5357 | memcpy (val, dataptr, sizeof (*val)); | |
8ddb1965 | 5358 | found = 1; |
219f2f23 PA |
5359 | } |
5360 | ||
5361 | /* Skip over this block. */ | |
5362 | dataptr += sizeof (LONGEST); | |
5363 | } | |
5364 | ||
8ddb1965 YQ |
5365 | if (!found) |
5366 | trace_debug ("traceframe %d has no data for variable %d", | |
5367 | tfnum, tsvnum); | |
5368 | return !found; | |
219f2f23 PA |
5369 | } |
5370 | ||
0fb4aa4b PA |
5371 | /* Read a requested block of static tracepoint data from a trace |
5372 | frame. */ | |
5373 | ||
5374 | int | |
5375 | traceframe_read_sdata (int tfnum, ULONGEST offset, | |
5376 | unsigned char *buf, ULONGEST length, | |
5377 | ULONGEST *nbytes) | |
5378 | { | |
5379 | struct traceframe *tframe; | |
5380 | unsigned char *database, *dataptr; | |
5381 | unsigned int datasize; | |
5382 | unsigned short mlen; | |
5383 | ||
5384 | trace_debug ("traceframe_read_sdata"); | |
5385 | ||
5386 | tframe = find_traceframe (tfnum); | |
5387 | ||
5388 | if (!tframe) | |
5389 | { | |
5390 | trace_debug ("traceframe %d not found", tfnum); | |
5391 | return 1; | |
5392 | } | |
5393 | ||
5394 | datasize = tframe->data_size; | |
5395 | database = &tframe->data[0]; | |
5396 | ||
5397 | /* Iterate through a traceframe's blocks, looking for static | |
5398 | tracepoint data. */ | |
5399 | dataptr = traceframe_find_block_type (database, datasize, | |
5400 | tfnum, 'S'); | |
5401 | if (dataptr != NULL) | |
5402 | { | |
5403 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5404 | dataptr += sizeof (mlen); | |
5405 | if (offset < mlen) | |
5406 | { | |
5407 | if (offset + length > mlen) | |
5408 | length = mlen - offset; | |
5409 | ||
5410 | memcpy (buf, dataptr, length); | |
5411 | *nbytes = length; | |
5412 | } | |
5413 | else | |
5414 | *nbytes = 0; | |
5415 | return 0; | |
5416 | } | |
5417 | ||
5418 | trace_debug ("traceframe %d has no static trace data", tfnum); | |
5419 | ||
5420 | *nbytes = 0; | |
5421 | return 0; | |
5422 | } | |
5423 | ||
b3b9301e PA |
5424 | /* Callback for traceframe_walk_blocks. Builds a traceframe-info |
5425 | object. DATA is pointer to a struct buffer holding the | |
5426 | traceframe-info object being built. */ | |
5427 | ||
5428 | static int | |
5429 | build_traceframe_info_xml (char blocktype, unsigned char *dataptr, void *data) | |
5430 | { | |
9a3c8263 | 5431 | struct buffer *buffer = (struct buffer *) data; |
b3b9301e PA |
5432 | |
5433 | switch (blocktype) | |
5434 | { | |
5435 | case 'M': | |
5436 | { | |
5437 | unsigned short mlen; | |
5438 | CORE_ADDR maddr; | |
5439 | ||
5440 | memcpy (&maddr, dataptr, sizeof (maddr)); | |
5441 | dataptr += sizeof (maddr); | |
5442 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
5443 | dataptr += sizeof (mlen); | |
5444 | buffer_xml_printf (buffer, | |
5445 | "<memory start=\"0x%s\" length=\"0x%s\"/>\n", | |
5446 | paddress (maddr), phex_nz (mlen, sizeof (mlen))); | |
5447 | break; | |
5448 | } | |
5449 | case 'V': | |
28a93511 YQ |
5450 | { |
5451 | int vnum; | |
5452 | ||
5453 | memcpy (&vnum, dataptr, sizeof (vnum)); | |
5454 | buffer_xml_printf (buffer, "<tvar id=\"%d\"/>\n", vnum); | |
5455 | break; | |
5456 | } | |
b3b9301e PA |
5457 | case 'R': |
5458 | case 'S': | |
5459 | { | |
5460 | break; | |
5461 | } | |
5462 | default: | |
5463 | warning ("Unhandled trace block type (%d) '%c ' " | |
5464 | "while building trace frame info.", | |
5465 | blocktype, blocktype); | |
5466 | break; | |
5467 | } | |
5468 | ||
5469 | return 0; | |
5470 | } | |
5471 | ||
5472 | /* Build a traceframe-info object for traceframe number TFNUM into | |
5473 | BUFFER. */ | |
5474 | ||
5475 | int | |
5476 | traceframe_read_info (int tfnum, struct buffer *buffer) | |
5477 | { | |
5478 | struct traceframe *tframe; | |
5479 | ||
5480 | trace_debug ("traceframe_read_info"); | |
5481 | ||
5482 | tframe = find_traceframe (tfnum); | |
5483 | ||
5484 | if (!tframe) | |
5485 | { | |
5486 | trace_debug ("traceframe %d not found", tfnum); | |
5487 | return 1; | |
5488 | } | |
5489 | ||
5490 | buffer_grow_str (buffer, "<traceframe-info>\n"); | |
5491 | traceframe_walk_blocks (tframe->data, tframe->data_size, | |
5492 | tfnum, build_traceframe_info_xml, buffer); | |
5493 | buffer_grow_str0 (buffer, "</traceframe-info>\n"); | |
5494 | return 0; | |
5495 | } | |
5496 | ||
fa593d66 PA |
5497 | /* Return the first fast tracepoint whose jump pad contains PC. */ |
5498 | ||
5499 | static struct tracepoint * | |
5500 | fast_tracepoint_from_jump_pad_address (CORE_ADDR pc) | |
5501 | { | |
5502 | struct tracepoint *tpoint; | |
5503 | ||
5504 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
5505 | if (tpoint->type == fast_tracepoint) | |
5506 | if (tpoint->jump_pad <= pc && pc < tpoint->jump_pad_end) | |
5507 | return tpoint; | |
5508 | ||
5509 | return NULL; | |
5510 | } | |
5511 | ||
405f8e94 SS |
5512 | /* Return the first fast tracepoint whose trampoline contains PC. */ |
5513 | ||
5514 | static struct tracepoint * | |
5515 | fast_tracepoint_from_trampoline_address (CORE_ADDR pc) | |
5516 | { | |
5517 | struct tracepoint *tpoint; | |
5518 | ||
5519 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
5520 | { | |
5521 | if (tpoint->type == fast_tracepoint | |
5522 | && tpoint->trampoline <= pc && pc < tpoint->trampoline_end) | |
5523 | return tpoint; | |
5524 | } | |
5525 | ||
5526 | return NULL; | |
5527 | } | |
5528 | ||
fa593d66 PA |
5529 | /* Return GDBserver's tracepoint that matches the IP Agent's |
5530 | tracepoint object that lives at IPA_TPOINT_OBJ in the IP Agent's | |
5531 | address space. */ | |
5532 | ||
5533 | static struct tracepoint * | |
5534 | fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR ipa_tpoint_obj) | |
5535 | { | |
5536 | struct tracepoint *tpoint; | |
5537 | ||
5538 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
5539 | if (tpoint->type == fast_tracepoint) | |
5540 | if (tpoint->obj_addr_on_target == ipa_tpoint_obj) | |
5541 | return tpoint; | |
5542 | ||
5543 | return NULL; | |
5544 | } | |
5545 | ||
5546 | #endif | |
5547 | ||
5548 | /* The type of the object that is used to synchronize fast tracepoint | |
5549 | collection. */ | |
5550 | ||
5551 | typedef struct collecting_t | |
5552 | { | |
5553 | /* The fast tracepoint number currently collecting. */ | |
5554 | uintptr_t tpoint; | |
5555 | ||
5556 | /* A number that GDBserver can use to identify the thread that is | |
5557 | presently holding the collect lock. This need not (and usually | |
5558 | is not) the thread id, as getting the current thread ID usually | |
5559 | requires a system call, which we want to avoid like the plague. | |
5560 | Usually this is thread's TCB, found in the TLS (pseudo-) | |
5561 | register, which is readable with a single insn on several | |
5562 | architectures. */ | |
5563 | uintptr_t thread_area; | |
5564 | } collecting_t; | |
5565 | ||
5566 | #ifndef IN_PROCESS_AGENT | |
5567 | ||
5568 | void | |
5569 | force_unlock_trace_buffer (void) | |
5570 | { | |
5571 | write_inferior_data_pointer (ipa_sym_addrs.addr_collecting, 0); | |
5572 | } | |
5573 | ||
5574 | /* Check if the thread identified by THREAD_AREA which is stopped at | |
5575 | STOP_PC, is presently locking the fast tracepoint collection, and | |
5576 | if so, gather some status of said collection. Returns 0 if the | |
5577 | thread isn't collecting or in the jump pad at all. 1, if in the | |
5578 | jump pad (or within gdb_collect) and hasn't executed the adjusted | |
5579 | original insn yet (can set a breakpoint there and run to it). 2, | |
5580 | if presently executing the adjusted original insn --- in which | |
5581 | case, if we want to move the thread out of the jump pad, we need to | |
5582 | single-step it until this function returns 0. */ | |
5583 | ||
5584 | int | |
5585 | fast_tracepoint_collecting (CORE_ADDR thread_area, | |
5586 | CORE_ADDR stop_pc, | |
5587 | struct fast_tpoint_collect_status *status) | |
5588 | { | |
5589 | CORE_ADDR ipa_collecting; | |
5590 | CORE_ADDR ipa_gdb_jump_pad_buffer, ipa_gdb_jump_pad_buffer_end; | |
405f8e94 SS |
5591 | CORE_ADDR ipa_gdb_trampoline_buffer; |
5592 | CORE_ADDR ipa_gdb_trampoline_buffer_end; | |
fa593d66 PA |
5593 | struct tracepoint *tpoint; |
5594 | int needs_breakpoint; | |
5595 | ||
5596 | /* The thread THREAD_AREA is either: | |
5597 | ||
5598 | 0. not collecting at all, not within the jump pad, or within | |
5599 | gdb_collect or one of its callees. | |
5600 | ||
5601 | 1. in the jump pad and haven't reached gdb_collect | |
5602 | ||
5603 | 2. within gdb_collect (out of the jump pad) (collect is set) | |
5604 | ||
5605 | 3. we're in the jump pad, after gdb_collect having returned, | |
5606 | possibly executing the adjusted insns. | |
5607 | ||
5608 | For cases 1 and 3, `collecting' may or not be set. The jump pad | |
5609 | doesn't have any complicated jump logic, so we can tell if the | |
5610 | thread is executing the adjust original insn or not by just | |
5611 | matching STOP_PC with known jump pad addresses. If we it isn't | |
5612 | yet executing the original insn, set a breakpoint there, and let | |
5613 | the thread run to it, so to quickly step over a possible (many | |
5614 | insns) gdb_collect call. Otherwise, or when the breakpoint is | |
5615 | hit, only a few (small number of) insns are left to be executed | |
5616 | in the jump pad. Single-step the thread until it leaves the | |
5617 | jump pad. */ | |
5618 | ||
5619 | again: | |
5620 | tpoint = NULL; | |
5621 | needs_breakpoint = 0; | |
5622 | trace_debug ("fast_tracepoint_collecting"); | |
5623 | ||
5624 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer, | |
5625 | &ipa_gdb_jump_pad_buffer)) | |
38e08fca GB |
5626 | { |
5627 | internal_error (__FILE__, __LINE__, | |
5628 | "error extracting `gdb_jump_pad_buffer'"); | |
5629 | } | |
fa593d66 PA |
5630 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer_end, |
5631 | &ipa_gdb_jump_pad_buffer_end)) | |
38e08fca GB |
5632 | { |
5633 | internal_error (__FILE__, __LINE__, | |
5634 | "error extracting `gdb_jump_pad_buffer_end'"); | |
5635 | } | |
fa593d66 | 5636 | |
405f8e94 SS |
5637 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer, |
5638 | &ipa_gdb_trampoline_buffer)) | |
38e08fca GB |
5639 | { |
5640 | internal_error (__FILE__, __LINE__, | |
5641 | "error extracting `gdb_trampoline_buffer'"); | |
5642 | } | |
405f8e94 SS |
5643 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_end, |
5644 | &ipa_gdb_trampoline_buffer_end)) | |
38e08fca GB |
5645 | { |
5646 | internal_error (__FILE__, __LINE__, | |
5647 | "error extracting `gdb_trampoline_buffer_end'"); | |
5648 | } | |
405f8e94 | 5649 | |
493e2a69 MS |
5650 | if (ipa_gdb_jump_pad_buffer <= stop_pc |
5651 | && stop_pc < ipa_gdb_jump_pad_buffer_end) | |
fa593d66 PA |
5652 | { |
5653 | /* We can tell which tracepoint(s) the thread is collecting by | |
5654 | matching the jump pad address back to the tracepoint. */ | |
5655 | tpoint = fast_tracepoint_from_jump_pad_address (stop_pc); | |
5656 | if (tpoint == NULL) | |
5657 | { | |
5658 | warning ("in jump pad, but no matching tpoint?"); | |
5659 | return 0; | |
5660 | } | |
5661 | else | |
5662 | { | |
5663 | trace_debug ("in jump pad of tpoint (%d, %s); jump_pad(%s, %s); " | |
5664 | "adj_insn(%s, %s)", | |
5665 | tpoint->number, paddress (tpoint->address), | |
5666 | paddress (tpoint->jump_pad), | |
5667 | paddress (tpoint->jump_pad_end), | |
5668 | paddress (tpoint->adjusted_insn_addr), | |
5669 | paddress (tpoint->adjusted_insn_addr_end)); | |
5670 | } | |
5671 | ||
5672 | /* Definitely in the jump pad. May or may not need | |
5673 | fast-exit-jump-pad breakpoint. */ | |
5674 | if (tpoint->jump_pad <= stop_pc | |
5675 | && stop_pc < tpoint->adjusted_insn_addr) | |
5676 | needs_breakpoint = 1; | |
5677 | } | |
405f8e94 SS |
5678 | else if (ipa_gdb_trampoline_buffer <= stop_pc |
5679 | && stop_pc < ipa_gdb_trampoline_buffer_end) | |
5680 | { | |
5681 | /* We can tell which tracepoint(s) the thread is collecting by | |
5682 | matching the trampoline address back to the tracepoint. */ | |
5683 | tpoint = fast_tracepoint_from_trampoline_address (stop_pc); | |
5684 | if (tpoint == NULL) | |
5685 | { | |
5686 | warning ("in trampoline, but no matching tpoint?"); | |
5687 | return 0; | |
5688 | } | |
5689 | else | |
5690 | { | |
5691 | trace_debug ("in trampoline of tpoint (%d, %s); trampoline(%s, %s)", | |
5692 | tpoint->number, paddress (tpoint->address), | |
5693 | paddress (tpoint->trampoline), | |
5694 | paddress (tpoint->trampoline_end)); | |
5695 | } | |
5696 | ||
5697 | /* Have not reached jump pad yet, but treat the trampoline as a | |
5698 | part of the jump pad that is before the adjusted original | |
5699 | instruction. */ | |
5700 | needs_breakpoint = 1; | |
5701 | } | |
fa593d66 PA |
5702 | else |
5703 | { | |
5704 | collecting_t ipa_collecting_obj; | |
5705 | ||
5706 | /* If `collecting' is set/locked, then the THREAD_AREA thread | |
5707 | may or not be the one holding the lock. We have to read the | |
5708 | lock to find out. */ | |
5709 | ||
5710 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_collecting, | |
5711 | &ipa_collecting)) | |
5712 | { | |
5713 | trace_debug ("fast_tracepoint_collecting:" | |
5714 | " failed reading 'collecting' in the inferior"); | |
5715 | return 0; | |
5716 | } | |
5717 | ||
5718 | if (!ipa_collecting) | |
5719 | { | |
5720 | trace_debug ("fast_tracepoint_collecting: not collecting" | |
5721 | " (and nobody is)."); | |
5722 | return 0; | |
5723 | } | |
5724 | ||
5725 | /* Some thread is collecting. Check which. */ | |
5726 | if (read_inferior_memory (ipa_collecting, | |
5727 | (unsigned char *) &ipa_collecting_obj, | |
5728 | sizeof (ipa_collecting_obj)) != 0) | |
5729 | goto again; | |
5730 | ||
5731 | if (ipa_collecting_obj.thread_area != thread_area) | |
5732 | { | |
5733 | trace_debug ("fast_tracepoint_collecting: not collecting " | |
5734 | "(another thread is)"); | |
5735 | return 0; | |
5736 | } | |
5737 | ||
5738 | tpoint | |
5739 | = fast_tracepoint_from_ipa_tpoint_address (ipa_collecting_obj.tpoint); | |
5740 | if (tpoint == NULL) | |
5741 | { | |
5742 | warning ("fast_tracepoint_collecting: collecting, " | |
5743 | "but tpoint %s not found?", | |
5744 | paddress ((CORE_ADDR) ipa_collecting_obj.tpoint)); | |
5745 | return 0; | |
5746 | } | |
5747 | ||
5748 | /* The thread is within `gdb_collect', skip over the rest of | |
5749 | fast tracepoint collection quickly using a breakpoint. */ | |
5750 | needs_breakpoint = 1; | |
5751 | } | |
5752 | ||
5753 | /* The caller wants a bit of status detail. */ | |
5754 | if (status != NULL) | |
5755 | { | |
5756 | status->tpoint_num = tpoint->number; | |
5757 | status->tpoint_addr = tpoint->address; | |
5758 | status->adjusted_insn_addr = tpoint->adjusted_insn_addr; | |
5759 | status->adjusted_insn_addr_end = tpoint->adjusted_insn_addr_end; | |
5760 | } | |
5761 | ||
5762 | if (needs_breakpoint) | |
5763 | { | |
5764 | /* Hasn't executed the original instruction yet. Set breakpoint | |
5765 | there, and wait till it's hit, then single-step until exiting | |
5766 | the jump pad. */ | |
5767 | ||
5768 | trace_debug ("\ | |
5769 | fast_tracepoint_collecting, returning continue-until-break at %s", | |
5770 | paddress (tpoint->adjusted_insn_addr)); | |
5771 | ||
5772 | return 1; /* continue */ | |
5773 | } | |
5774 | else | |
5775 | { | |
5776 | /* Just single-step until exiting the jump pad. */ | |
5777 | ||
5778 | trace_debug ("fast_tracepoint_collecting, returning " | |
5779 | "need-single-step (%s-%s)", | |
5780 | paddress (tpoint->adjusted_insn_addr), | |
5781 | paddress (tpoint->adjusted_insn_addr_end)); | |
5782 | ||
5783 | return 2; /* single-step */ | |
5784 | } | |
5785 | } | |
5786 | ||
5787 | #endif | |
5788 | ||
5789 | #ifdef IN_PROCESS_AGENT | |
5790 | ||
5791 | /* The global fast tracepoint collect lock. Points to a collecting_t | |
5792 | object built on the stack by the jump pad, if presently locked; | |
5793 | NULL if it isn't locked. Note that this lock *must* be set while | |
5794 | executing any *function other than the jump pad. See | |
5795 | fast_tracepoint_collecting. */ | |
3c14e5a3 PA |
5796 | EXTERN_C_PUSH |
5797 | IP_AGENT_EXPORT_VAR collecting_t *collecting; | |
5798 | EXTERN_C_POP | |
fa593d66 PA |
5799 | |
5800 | /* This routine, called from the jump pad (in asm) is designed to be | |
5801 | called from the jump pads of fast tracepoints, thus it is on the | |
5802 | critical path. */ | |
5803 | ||
3c14e5a3 | 5804 | IP_AGENT_EXPORT_FUNC void |
fa593d66 PA |
5805 | gdb_collect (struct tracepoint *tpoint, unsigned char *regs) |
5806 | { | |
5807 | struct fast_tracepoint_ctx ctx; | |
ae91f625 | 5808 | const struct target_desc *ipa_tdesc; |
fa593d66 PA |
5809 | |
5810 | /* Don't do anything until the trace run is completely set up. */ | |
5811 | if (!tracing) | |
5812 | return; | |
5813 | ||
ae91f625 | 5814 | ipa_tdesc = get_ipa_tdesc (ipa_tdesc_idx); |
fa593d66 PA |
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). */ | |
224c3ddb | 5820 | ctx.regspace = (unsigned char *) 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 | ||
1cda1512 MK |
5873 | /* These global variables points to the corresponding functions. This is |
5874 | necessary on powerpc64, where asking for function symbol address from gdb | |
5875 | results in returning the actual code pointer, instead of the descriptor | |
5876 | pointer. */ | |
5877 | ||
5878 | typedef void (*gdb_collect_ptr_type) (struct tracepoint *, unsigned char *); | |
5879 | typedef ULONGEST (*get_raw_reg_ptr_type) (const unsigned char *, int); | |
5880 | typedef LONGEST (*get_trace_state_variable_value_ptr_type) (int); | |
5881 | typedef void (*set_trace_state_variable_value_ptr_type) (int, LONGEST); | |
5882 | ||
5883 | EXTERN_C_PUSH | |
252db07e MK |
5884 | IP_AGENT_EXPORT_VAR gdb_collect_ptr_type gdb_collect_ptr = gdb_collect; |
5885 | IP_AGENT_EXPORT_VAR get_raw_reg_ptr_type get_raw_reg_ptr = get_raw_reg; | |
5886 | IP_AGENT_EXPORT_VAR get_trace_state_variable_value_ptr_type | |
1cda1512 | 5887 | get_trace_state_variable_value_ptr = get_trace_state_variable_value; |
252db07e | 5888 | IP_AGENT_EXPORT_VAR set_trace_state_variable_value_ptr_type |
1cda1512 MK |
5889 | set_trace_state_variable_value_ptr = set_trace_state_variable_value; |
5890 | EXTERN_C_POP | |
5891 | ||
fa593d66 PA |
5892 | #endif |
5893 | ||
5894 | #ifndef IN_PROCESS_AGENT | |
5895 | ||
6a271cae PA |
5896 | CORE_ADDR |
5897 | get_raw_reg_func_addr (void) | |
5898 | { | |
1cda1512 MK |
5899 | CORE_ADDR res; |
5900 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_get_raw_reg_ptr, &res)) | |
5901 | { | |
5902 | error ("error extracting get_raw_reg_ptr"); | |
5903 | return 0; | |
5904 | } | |
5905 | return res; | |
6a271cae PA |
5906 | } |
5907 | ||
5e1dc496 LM |
5908 | CORE_ADDR |
5909 | get_get_tsv_func_addr (void) | |
6b9801d4 | 5910 | { |
1cda1512 MK |
5911 | CORE_ADDR res; |
5912 | if (read_inferior_data_pointer ( | |
5913 | ipa_sym_addrs.addr_get_trace_state_variable_value_ptr, &res)) | |
5914 | { | |
5915 | error ("error extracting get_trace_state_variable_value_ptr"); | |
5916 | return 0; | |
5917 | } | |
5918 | return res; | |
6b9801d4 SS |
5919 | } |
5920 | ||
5e1dc496 LM |
5921 | CORE_ADDR |
5922 | get_set_tsv_func_addr (void) | |
6b9801d4 | 5923 | { |
1cda1512 MK |
5924 | CORE_ADDR res; |
5925 | if (read_inferior_data_pointer ( | |
5926 | ipa_sym_addrs.addr_set_trace_state_variable_value_ptr, &res)) | |
5927 | { | |
5928 | error ("error extracting set_trace_state_variable_value_ptr"); | |
5929 | return 0; | |
5930 | } | |
5931 | return res; | |
6b9801d4 SS |
5932 | } |
5933 | ||
6a271cae | 5934 | static void |
493e2a69 MS |
5935 | compile_tracepoint_condition (struct tracepoint *tpoint, |
5936 | CORE_ADDR *jump_entry) | |
6a271cae PA |
5937 | { |
5938 | CORE_ADDR entry_point = *jump_entry; | |
5939 | enum eval_result_type err; | |
5940 | ||
5941 | trace_debug ("Starting condition compilation for tracepoint %d\n", | |
5942 | tpoint->number); | |
5943 | ||
5944 | /* Initialize the global pointer to the code being built. */ | |
5945 | current_insn_ptr = *jump_entry; | |
5946 | ||
5947 | emit_prologue (); | |
5948 | ||
5949 | err = compile_bytecodes (tpoint->cond); | |
5950 | ||
5951 | if (err == expr_eval_no_error) | |
5952 | { | |
5953 | emit_epilogue (); | |
5954 | ||
5955 | /* Record the beginning of the compiled code. */ | |
5956 | tpoint->compiled_cond = entry_point; | |
5957 | ||
5958 | trace_debug ("Condition compilation for tracepoint %d complete\n", | |
5959 | tpoint->number); | |
5960 | } | |
5961 | else | |
5962 | { | |
5963 | /* Leave the unfinished code in situ, but don't point to it. */ | |
5964 | ||
5965 | tpoint->compiled_cond = 0; | |
5966 | ||
5967 | trace_debug ("Condition compilation for tracepoint %d failed, " | |
5968 | "error code %d", | |
5969 | tpoint->number, err); | |
5970 | } | |
5971 | ||
5972 | /* Update the code pointer passed in. Note that we do this even if | |
5973 | the compile fails, so that we can look at the partial results | |
5974 | instead of letting them be overwritten. */ | |
5975 | *jump_entry = current_insn_ptr; | |
5976 | ||
5977 | /* Leave a gap, to aid dump decipherment. */ | |
5978 | *jump_entry += 16; | |
5979 | } | |
5980 | ||
fa593d66 PA |
5981 | /* The base pointer of the IPA's heap. This is the only memory the |
5982 | IPA is allowed to use. The IPA should _not_ call the inferior's | |
5983 | `malloc' during operation. That'd be slow, and, most importantly, | |
5984 | it may not be safe. We may be collecting a tracepoint in a signal | |
5985 | handler, for example. */ | |
5986 | static CORE_ADDR target_tp_heap; | |
5987 | ||
5988 | /* Allocate at least SIZE bytes of memory from the IPA heap, aligned | |
5989 | to 8 bytes. */ | |
5990 | ||
5991 | static CORE_ADDR | |
5992 | target_malloc (ULONGEST size) | |
5993 | { | |
5994 | CORE_ADDR ptr; | |
5995 | ||
5996 | if (target_tp_heap == 0) | |
5997 | { | |
5998 | /* We have the pointer *address*, need what it points to. */ | |
5999 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_tp_heap_buffer, | |
6000 | &target_tp_heap)) | |
38e08fca GB |
6001 | { |
6002 | internal_error (__FILE__, __LINE__, | |
6003 | "couldn't get target heap head pointer"); | |
6004 | } | |
fa593d66 PA |
6005 | } |
6006 | ||
6007 | ptr = target_tp_heap; | |
6008 | target_tp_heap += size; | |
6009 | ||
6010 | /* Pad to 8-byte alignment. */ | |
6011 | target_tp_heap = ((target_tp_heap + 7) & ~0x7); | |
6012 | ||
6013 | return ptr; | |
6014 | } | |
6015 | ||
6016 | static CORE_ADDR | |
6017 | download_agent_expr (struct agent_expr *expr) | |
6018 | { | |
6019 | CORE_ADDR expr_addr; | |
6020 | CORE_ADDR expr_bytes; | |
6021 | ||
6022 | expr_addr = target_malloc (sizeof (*expr)); | |
6023 | write_inferior_memory (expr_addr, (unsigned char *) expr, sizeof (*expr)); | |
6024 | ||
6025 | expr_bytes = target_malloc (expr->length); | |
020ecd38 MK |
6026 | write_inferior_data_pointer (expr_addr + offsetof (struct agent_expr, bytes), |
6027 | expr_bytes); | |
fa593d66 PA |
6028 | write_inferior_memory (expr_bytes, expr->bytes, expr->length); |
6029 | ||
6030 | return expr_addr; | |
6031 | } | |
6032 | ||
6033 | /* Align V up to N bits. */ | |
6034 | #define UALIGN(V, N) (((V) + ((N) - 1)) & ~((N) - 1)) | |
6035 | ||
5c73ff4e YQ |
6036 | /* Sync tracepoint with IPA, but leave maintenance of linked list to caller. */ |
6037 | ||
fa593d66 | 6038 | static void |
5c73ff4e | 6039 | download_tracepoint_1 (struct tracepoint *tpoint) |
fa593d66 | 6040 | { |
5c73ff4e YQ |
6041 | struct tracepoint target_tracepoint; |
6042 | CORE_ADDR tpptr = 0; | |
fa593d66 | 6043 | |
5c73ff4e YQ |
6044 | gdb_assert (tpoint->type == fast_tracepoint |
6045 | || tpoint->type == static_tracepoint); | |
fa593d66 | 6046 | |
5c73ff4e | 6047 | if (tpoint->cond != NULL && target_emit_ops () != NULL) |
fa593d66 | 6048 | { |
5c73ff4e | 6049 | CORE_ADDR jentry, jump_entry; |
fa593d66 | 6050 | |
5c73ff4e | 6051 | jentry = jump_entry = get_jump_space_head (); |
fa593d66 | 6052 | |
5c73ff4e | 6053 | if (tpoint->cond != NULL) |
6a271cae | 6054 | { |
5c73ff4e YQ |
6055 | /* Pad to 8-byte alignment. (needed?) */ |
6056 | /* Actually this should be left for the target to | |
6057 | decide. */ | |
6058 | jentry = UALIGN (jentry, 8); | |
6059 | ||
6060 | compile_tracepoint_condition (tpoint, &jentry); | |
6061 | } | |
6062 | ||
6063 | /* Pad to 8-byte alignment. */ | |
6064 | jentry = UALIGN (jentry, 8); | |
6065 | claim_jump_space (jentry - jump_entry); | |
6066 | } | |
6a271cae | 6067 | |
5c73ff4e | 6068 | target_tracepoint = *tpoint; |
6a271cae | 6069 | |
5c73ff4e YQ |
6070 | tpptr = target_malloc (sizeof (*tpoint)); |
6071 | tpoint->obj_addr_on_target = tpptr; | |
6072 | ||
6073 | /* Write the whole object. We'll fix up its pointers in a bit. | |
6074 | Assume no next for now. This is fixed up above on the next | |
6075 | iteration, if there's any. */ | |
6076 | target_tracepoint.next = NULL; | |
6077 | /* Need to clear this here too, since we're downloading the | |
6078 | tracepoints before clearing our own copy. */ | |
6079 | target_tracepoint.hit_count = 0; | |
6080 | ||
6081 | write_inferior_memory (tpptr, (unsigned char *) &target_tracepoint, | |
6082 | sizeof (target_tracepoint)); | |
6083 | ||
6084 | if (tpoint->cond) | |
020ecd38 MK |
6085 | write_inferior_data_pointer (tpptr |
6086 | + offsetof (struct tracepoint, cond), | |
6087 | download_agent_expr (tpoint->cond)); | |
5c73ff4e YQ |
6088 | |
6089 | if (tpoint->numactions) | |
6090 | { | |
6091 | int i; | |
6092 | CORE_ADDR actions_array; | |
6093 | ||
6094 | /* The pointers array. */ | |
6095 | actions_array | |
6096 | = target_malloc (sizeof (*tpoint->actions) * tpoint->numactions); | |
020ecd38 MK |
6097 | write_inferior_data_pointer (tpptr + offsetof (struct tracepoint, |
6098 | actions), | |
6099 | actions_array); | |
5c73ff4e YQ |
6100 | |
6101 | /* Now for each pointer, download the action. */ | |
6102 | for (i = 0; i < tpoint->numactions; i++) | |
6103 | { | |
5c73ff4e | 6104 | struct tracepoint_action *action = tpoint->actions[i]; |
7cae9051 | 6105 | CORE_ADDR ipa_action = tracepoint_action_download (action); |
6a271cae | 6106 | |
5c73ff4e | 6107 | if (ipa_action != 0) |
020ecd38 MK |
6108 | write_inferior_data_pointer (actions_array |
6109 | + i * sizeof (*tpoint->actions), | |
6110 | ipa_action); | |
6a271cae | 6111 | } |
5c73ff4e YQ |
6112 | } |
6113 | } | |
6a271cae | 6114 | |
42476b70 YQ |
6115 | #define IPA_PROTO_FAST_TRACE_FLAG 0 |
6116 | #define IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET 2 | |
6117 | #define IPA_PROTO_FAST_TRACE_JUMP_PAD 10 | |
6118 | #define IPA_PROTO_FAST_TRACE_FJUMP_SIZE 18 | |
6119 | #define IPA_PROTO_FAST_TRACE_FJUMP_INSN 22 | |
6120 | ||
6121 | /* Send a command to agent to download and install tracepoint TPOINT. */ | |
6122 | ||
6123 | static int | |
6124 | tracepoint_send_agent (struct tracepoint *tpoint) | |
6125 | { | |
6126 | char buf[IPA_CMD_BUF_SIZE]; | |
6127 | char *p; | |
6128 | int i, ret; | |
6129 | ||
6130 | p = buf; | |
6131 | strcpy (p, "FastTrace:"); | |
6132 | p += 10; | |
6133 | ||
6134 | COPY_FIELD_TO_BUF (p, tpoint, number); | |
6135 | COPY_FIELD_TO_BUF (p, tpoint, address); | |
6136 | COPY_FIELD_TO_BUF (p, tpoint, type); | |
6137 | COPY_FIELD_TO_BUF (p, tpoint, enabled); | |
6138 | COPY_FIELD_TO_BUF (p, tpoint, step_count); | |
6139 | COPY_FIELD_TO_BUF (p, tpoint, pass_count); | |
6140 | COPY_FIELD_TO_BUF (p, tpoint, numactions); | |
6141 | COPY_FIELD_TO_BUF (p, tpoint, hit_count); | |
6142 | COPY_FIELD_TO_BUF (p, tpoint, traceframe_usage); | |
6143 | COPY_FIELD_TO_BUF (p, tpoint, compiled_cond); | |
6144 | COPY_FIELD_TO_BUF (p, tpoint, orig_size); | |
6145 | ||
6146 | /* condition */ | |
6147 | p = agent_expr_send (p, tpoint->cond); | |
6148 | ||
6149 | /* tracepoint_action */ | |
6150 | for (i = 0; i < tpoint->numactions; i++) | |
6151 | { | |
6152 | struct tracepoint_action *action = tpoint->actions[i]; | |
6153 | ||
6154 | p[0] = action->type; | |
7cae9051 | 6155 | p = tracepoint_action_send (&p[1], action); |
42476b70 YQ |
6156 | } |
6157 | ||
6158 | get_jump_space_head (); | |
6159 | /* Copy the value of GDB_JUMP_PAD_HEAD to command buffer, so that | |
6160 | agent can use jump pad from it. */ | |
6161 | if (tpoint->type == fast_tracepoint) | |
6162 | { | |
6163 | memcpy (p, &gdb_jump_pad_head, 8); | |
6164 | p += 8; | |
6165 | } | |
6166 | ||
6167 | ret = run_inferior_command (buf, (int) (ptrdiff_t) (p - buf)); | |
6168 | if (ret) | |
6169 | return ret; | |
6170 | ||
61012eef | 6171 | if (!startswith (buf, "OK")) |
42476b70 YQ |
6172 | return 1; |
6173 | ||
6174 | /* The value of tracepoint's target address is stored in BUF. */ | |
6175 | memcpy (&tpoint->obj_addr_on_target, | |
6176 | &buf[IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET], 8); | |
6177 | ||
6178 | if (tpoint->type == fast_tracepoint) | |
6179 | { | |
6180 | unsigned char *insn | |
6181 | = (unsigned char *) &buf[IPA_PROTO_FAST_TRACE_FJUMP_INSN]; | |
6182 | int fjump_size; | |
6183 | ||
6184 | trace_debug ("agent: read from cmd_buf 0x%x 0x%x\n", | |
6185 | (unsigned int) tpoint->obj_addr_on_target, | |
6186 | (unsigned int) gdb_jump_pad_head); | |
6187 | ||
6188 | memcpy (&gdb_jump_pad_head, &buf[IPA_PROTO_FAST_TRACE_JUMP_PAD], 8); | |
6189 | ||
6190 | /* This has been done in agent. We should also set up record for it. */ | |
6191 | memcpy (&fjump_size, &buf[IPA_PROTO_FAST_TRACE_FJUMP_SIZE], 4); | |
6192 | /* Wire it in. */ | |
6193 | tpoint->handle | |
6194 | = set_fast_tracepoint_jump (tpoint->address, insn, fjump_size); | |
6195 | } | |
6196 | ||
6197 | return 0; | |
6198 | } | |
6199 | ||
1e4d1764 YQ |
6200 | static void |
6201 | download_tracepoint (struct tracepoint *tpoint) | |
6202 | { | |
6203 | struct tracepoint *tp, *tp_prev; | |
6204 | ||
6205 | if (tpoint->type != fast_tracepoint | |
6206 | && tpoint->type != static_tracepoint) | |
6207 | return; | |
6208 | ||
6209 | download_tracepoint_1 (tpoint); | |
6210 | ||
6211 | /* Find the previous entry of TPOINT, which is fast tracepoint or | |
6212 | static tracepoint. */ | |
6213 | tp_prev = NULL; | |
6214 | for (tp = tracepoints; tp != tpoint; tp = tp->next) | |
6215 | { | |
6216 | if (tp->type == fast_tracepoint || tp->type == static_tracepoint) | |
6217 | tp_prev = tp; | |
6218 | } | |
6219 | ||
6220 | if (tp_prev) | |
6221 | { | |
6222 | CORE_ADDR tp_prev_target_next_addr; | |
6223 | ||
6224 | /* Insert TPOINT after TP_PREV in IPA. */ | |
6225 | if (read_inferior_data_pointer (tp_prev->obj_addr_on_target | |
6226 | + offsetof (struct tracepoint, next), | |
6227 | &tp_prev_target_next_addr)) | |
38e08fca GB |
6228 | { |
6229 | internal_error (__FILE__, __LINE__, | |
6230 | "error reading `tp_prev->next'"); | |
6231 | } | |
1e4d1764 YQ |
6232 | |
6233 | /* tpoint->next = tp_prev->next */ | |
020ecd38 MK |
6234 | write_inferior_data_pointer (tpoint->obj_addr_on_target |
6235 | + offsetof (struct tracepoint, next), | |
6236 | tp_prev_target_next_addr); | |
1e4d1764 | 6237 | /* tp_prev->next = tpoint */ |
020ecd38 MK |
6238 | write_inferior_data_pointer (tp_prev->obj_addr_on_target |
6239 | + offsetof (struct tracepoint, next), | |
6240 | tpoint->obj_addr_on_target); | |
1e4d1764 YQ |
6241 | } |
6242 | else | |
6243 | /* First object in list, set the head pointer in the | |
6244 | inferior. */ | |
020ecd38 MK |
6245 | write_inferior_data_pointer (ipa_sym_addrs.addr_tracepoints, |
6246 | tpoint->obj_addr_on_target); | |
1e4d1764 YQ |
6247 | |
6248 | } | |
6249 | ||
fa593d66 PA |
6250 | static void |
6251 | download_trace_state_variables (void) | |
6252 | { | |
6253 | CORE_ADDR ptr = 0, prev_ptr = 0; | |
6254 | struct trace_state_variable *tsv; | |
6255 | ||
6256 | /* Start out empty. */ | |
020ecd38 | 6257 | write_inferior_data_pointer (ipa_sym_addrs.addr_trace_state_variables, 0); |
fa593d66 PA |
6258 | |
6259 | for (tsv = trace_state_variables; tsv != NULL; tsv = tsv->next) | |
6260 | { | |
6261 | struct trace_state_variable target_tsv; | |
6262 | ||
6263 | /* TSV's with a getter have been initialized equally in both the | |
6264 | inferior and GDBserver. Skip them. */ | |
6265 | if (tsv->getter != NULL) | |
6266 | continue; | |
6267 | ||
6268 | target_tsv = *tsv; | |
6269 | ||
6270 | prev_ptr = ptr; | |
6271 | ptr = target_malloc (sizeof (*tsv)); | |
6272 | ||
6273 | if (tsv == trace_state_variables) | |
6274 | { | |
6275 | /* First object in list, set the head pointer in the | |
6276 | inferior. */ | |
6277 | ||
020ecd38 MK |
6278 | write_inferior_data_pointer (ipa_sym_addrs.addr_trace_state_variables, |
6279 | ptr); | |
fa593d66 PA |
6280 | } |
6281 | else | |
6282 | { | |
020ecd38 MK |
6283 | write_inferior_data_pointer (prev_ptr |
6284 | + offsetof (struct trace_state_variable, | |
6285 | next), | |
6286 | ptr); | |
fa593d66 PA |
6287 | } |
6288 | ||
6289 | /* Write the whole object. We'll fix up its pointers in a bit. | |
6290 | Assume no next, fixup when needed. */ | |
6291 | target_tsv.next = NULL; | |
6292 | ||
6293 | write_inferior_memory (ptr, (unsigned char *) &target_tsv, | |
6294 | sizeof (target_tsv)); | |
6295 | ||
6296 | if (tsv->name != NULL) | |
6297 | { | |
6298 | size_t size = strlen (tsv->name) + 1; | |
6299 | CORE_ADDR name_addr = target_malloc (size); | |
6300 | write_inferior_memory (name_addr, | |
6301 | (unsigned char *) tsv->name, size); | |
020ecd38 MK |
6302 | write_inferior_data_pointer (ptr |
6303 | + offsetof (struct trace_state_variable, | |
6304 | name), | |
6305 | name_addr); | |
fa593d66 PA |
6306 | } |
6307 | ||
38e08fca | 6308 | gdb_assert (tsv->getter == NULL); |
fa593d66 PA |
6309 | } |
6310 | ||
6311 | if (prev_ptr != 0) | |
6312 | { | |
6313 | /* Fixup the next pointer in the last item in the list. */ | |
020ecd38 MK |
6314 | write_inferior_data_pointer (prev_ptr |
6315 | + offsetof (struct trace_state_variable, | |
6316 | next), 0); | |
fa593d66 PA |
6317 | } |
6318 | } | |
6319 | ||
6320 | /* Upload complete trace frames out of the IP Agent's trace buffer | |
6321 | into GDBserver's trace buffer. This always uploads either all or | |
6322 | no trace frames. This is the counter part of | |
6323 | `trace_alloc_trace_buffer'. See its description of the atomic | |
6324 | synching mechanism. */ | |
6325 | ||
6326 | static void | |
6327 | upload_fast_traceframes (void) | |
6328 | { | |
6329 | unsigned int ipa_traceframe_read_count, ipa_traceframe_write_count; | |
6330 | unsigned int ipa_traceframe_read_count_racy, ipa_traceframe_write_count_racy; | |
6331 | CORE_ADDR tf; | |
6332 | struct ipa_trace_buffer_control ipa_trace_buffer_ctrl; | |
6333 | unsigned int curr_tbctrl_idx; | |
6334 | unsigned int ipa_trace_buffer_ctrl_curr; | |
6335 | unsigned int ipa_trace_buffer_ctrl_curr_old; | |
6336 | CORE_ADDR ipa_trace_buffer_ctrl_addr; | |
6337 | struct breakpoint *about_to_request_buffer_space_bkpt; | |
6338 | CORE_ADDR ipa_trace_buffer_lo; | |
6339 | CORE_ADDR ipa_trace_buffer_hi; | |
6340 | ||
6341 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, | |
6342 | &ipa_traceframe_read_count_racy)) | |
6343 | { | |
6344 | /* This will happen in most targets if the current thread is | |
6345 | running. */ | |
6346 | return; | |
6347 | } | |
6348 | ||
6349 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, | |
6350 | &ipa_traceframe_write_count_racy)) | |
6351 | return; | |
6352 | ||
6353 | trace_debug ("ipa_traceframe_count (racy area): %d (w=%d, r=%d)", | |
493e2a69 MS |
6354 | ipa_traceframe_write_count_racy |
6355 | - ipa_traceframe_read_count_racy, | |
6356 | ipa_traceframe_write_count_racy, | |
6357 | ipa_traceframe_read_count_racy); | |
fa593d66 PA |
6358 | |
6359 | if (ipa_traceframe_write_count_racy == ipa_traceframe_read_count_racy) | |
6360 | return; | |
6361 | ||
6362 | about_to_request_buffer_space_bkpt | |
6363 | = set_breakpoint_at (ipa_sym_addrs.addr_about_to_request_buffer_space, | |
6364 | NULL); | |
6365 | ||
6366 | if (read_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, | |
6367 | &ipa_trace_buffer_ctrl_curr)) | |
6368 | return; | |
6369 | ||
6370 | ipa_trace_buffer_ctrl_curr_old = ipa_trace_buffer_ctrl_curr; | |
6371 | ||
6372 | curr_tbctrl_idx = ipa_trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK; | |
6373 | ||
6374 | { | |
6375 | unsigned int prev, counter; | |
6376 | ||
6377 | /* Update the token, with new counters, and the GDBserver stamp | |
6378 | bit. Alway reuse the current TBC index. */ | |
2ece8244 YQ |
6379 | prev = ipa_trace_buffer_ctrl_curr & GDBSERVER_FLUSH_COUNT_MASK_CURR; |
6380 | counter = (prev + 0x100) & GDBSERVER_FLUSH_COUNT_MASK_CURR; | |
fa593d66 | 6381 | |
2ece8244 | 6382 | ipa_trace_buffer_ctrl_curr = (GDBSERVER_UPDATED_FLUSH_COUNT_BIT |
fa593d66 PA |
6383 | | (prev << 12) |
6384 | | counter | |
6385 | | curr_tbctrl_idx); | |
6386 | } | |
6387 | ||
6388 | if (write_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, | |
6389 | ipa_trace_buffer_ctrl_curr)) | |
6390 | return; | |
6391 | ||
6392 | trace_debug ("Lib: Committed %08x -> %08x", | |
6393 | ipa_trace_buffer_ctrl_curr_old, | |
6394 | ipa_trace_buffer_ctrl_curr); | |
6395 | ||
6396 | /* Re-read these, now that we've installed the | |
6397 | `about_to_request_buffer_space' breakpoint/lock. A thread could | |
6398 | have finished a traceframe between the last read of these | |
6399 | counters and setting the breakpoint above. If we start | |
6400 | uploading, we never want to leave this function with | |
6401 | traceframe_read_count != 0, otherwise, GDBserver could end up | |
6402 | incrementing the counter tokens more than once (due to event loop | |
6403 | nesting), which would break the IP agent's "effective" detection | |
6404 | (see trace_alloc_trace_buffer). */ | |
6405 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, | |
6406 | &ipa_traceframe_read_count)) | |
6407 | return; | |
6408 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, | |
6409 | &ipa_traceframe_write_count)) | |
6410 | return; | |
6411 | ||
6412 | if (debug_threads) | |
6413 | { | |
6414 | trace_debug ("ipa_traceframe_count (blocked area): %d (w=%d, r=%d)", | |
6415 | ipa_traceframe_write_count - ipa_traceframe_read_count, | |
6416 | ipa_traceframe_write_count, ipa_traceframe_read_count); | |
6417 | ||
6418 | if (ipa_traceframe_write_count != ipa_traceframe_write_count_racy | |
6419 | || ipa_traceframe_read_count != ipa_traceframe_read_count_racy) | |
6420 | trace_debug ("note that ipa_traceframe_count's parts changed"); | |
6421 | } | |
6422 | ||
6423 | /* Get the address of the current TBC object (the IP agent has an | |
6424 | array of 3 such objects). The index is stored in the TBC | |
6425 | token. */ | |
6426 | ipa_trace_buffer_ctrl_addr = ipa_sym_addrs.addr_trace_buffer_ctrl; | |
6427 | ipa_trace_buffer_ctrl_addr | |
6428 | += sizeof (struct ipa_trace_buffer_control) * curr_tbctrl_idx; | |
6429 | ||
6430 | if (read_inferior_memory (ipa_trace_buffer_ctrl_addr, | |
6431 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
6432 | sizeof (struct ipa_trace_buffer_control))) | |
6433 | return; | |
6434 | ||
6435 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_lo, | |
6436 | &ipa_trace_buffer_lo)) | |
6437 | return; | |
6438 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_hi, | |
6439 | &ipa_trace_buffer_hi)) | |
6440 | return; | |
6441 | ||
6442 | /* Offsets are easier to grok for debugging than raw addresses, | |
6443 | especially for the small trace buffer sizes that are useful for | |
6444 | testing. */ | |
6445 | trace_debug ("Lib: Trace buffer [%d] start=%d free=%d " | |
6446 | "endfree=%d wrap=%d hi=%d", | |
6447 | curr_tbctrl_idx, | |
6448 | (int) (ipa_trace_buffer_ctrl.start - ipa_trace_buffer_lo), | |
6449 | (int) (ipa_trace_buffer_ctrl.free - ipa_trace_buffer_lo), | |
6450 | (int) (ipa_trace_buffer_ctrl.end_free - ipa_trace_buffer_lo), | |
6451 | (int) (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo), | |
6452 | (int) (ipa_trace_buffer_hi - ipa_trace_buffer_lo)); | |
6453 | ||
6454 | /* Note that the IPA's buffer is always circular. */ | |
6455 | ||
6456 | #define IPA_FIRST_TRACEFRAME() (ipa_trace_buffer_ctrl.start) | |
6457 | ||
6458 | #define IPA_NEXT_TRACEFRAME_1(TF, TFOBJ) \ | |
6459 | ((TF) + sizeof (struct traceframe) + (TFOBJ)->data_size) | |
6460 | ||
6461 | #define IPA_NEXT_TRACEFRAME(TF, TFOBJ) \ | |
6462 | (IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) \ | |
6463 | - ((IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) >= ipa_trace_buffer_ctrl.wrap) \ | |
6464 | ? (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo) \ | |
6465 | : 0)) | |
6466 | ||
6467 | tf = IPA_FIRST_TRACEFRAME (); | |
6468 | ||
6469 | while (ipa_traceframe_write_count - ipa_traceframe_read_count) | |
6470 | { | |
6471 | struct tracepoint *tpoint; | |
6472 | struct traceframe *tframe; | |
6473 | unsigned char *block; | |
6474 | struct traceframe ipa_tframe; | |
6475 | ||
6476 | if (read_inferior_memory (tf, (unsigned char *) &ipa_tframe, | |
6477 | offsetof (struct traceframe, data))) | |
6478 | error ("Uploading: couldn't read traceframe at %s\n", paddress (tf)); | |
6479 | ||
6480 | if (ipa_tframe.tpnum == 0) | |
38e08fca GB |
6481 | { |
6482 | internal_error (__FILE__, __LINE__, | |
6483 | "Uploading: No (more) fast traceframes, but" | |
6484 | " ipa_traceframe_count == %u??\n", | |
6485 | ipa_traceframe_write_count | |
6486 | - ipa_traceframe_read_count); | |
6487 | } | |
fa593d66 PA |
6488 | |
6489 | /* Note that this will be incorrect for multi-location | |
6490 | tracepoints... */ | |
6491 | tpoint = find_next_tracepoint_by_number (NULL, ipa_tframe.tpnum); | |
6492 | ||
6493 | tframe = add_traceframe (tpoint); | |
6494 | if (tframe == NULL) | |
6495 | { | |
6496 | trace_buffer_is_full = 1; | |
6497 | trace_debug ("Uploading: trace buffer is full"); | |
6498 | } | |
6499 | else | |
6500 | { | |
6501 | /* Copy the whole set of blocks in one go for now. FIXME: | |
6502 | split this in smaller blocks. */ | |
5ae4861a YQ |
6503 | block = add_traceframe_block (tframe, tpoint, |
6504 | ipa_tframe.data_size); | |
fa593d66 PA |
6505 | if (block != NULL) |
6506 | { | |
493e2a69 MS |
6507 | if (read_inferior_memory (tf |
6508 | + offsetof (struct traceframe, data), | |
fa593d66 PA |
6509 | block, ipa_tframe.data_size)) |
6510 | error ("Uploading: Couldn't read traceframe data at %s\n", | |
6511 | paddress (tf + offsetof (struct traceframe, data))); | |
6512 | } | |
6513 | ||
6514 | trace_debug ("Uploading: traceframe didn't fit"); | |
6515 | finish_traceframe (tframe); | |
6516 | } | |
6517 | ||
6518 | tf = IPA_NEXT_TRACEFRAME (tf, &ipa_tframe); | |
6519 | ||
6520 | /* If we freed the traceframe that wrapped around, go back | |
6521 | to the non-wrap case. */ | |
6522 | if (tf < ipa_trace_buffer_ctrl.start) | |
6523 | { | |
6524 | trace_debug ("Lib: Discarding past the wraparound"); | |
6525 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
6526 | } | |
6527 | ipa_trace_buffer_ctrl.start = tf; | |
6528 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_ctrl.start; | |
6529 | ++ipa_traceframe_read_count; | |
6530 | ||
6531 | if (ipa_trace_buffer_ctrl.start == ipa_trace_buffer_ctrl.free | |
6532 | && ipa_trace_buffer_ctrl.start == ipa_trace_buffer_ctrl.end_free) | |
6533 | { | |
6534 | trace_debug ("Lib: buffer is fully empty. " | |
6535 | "Trace buffer [%d] start=%d free=%d endfree=%d", | |
6536 | curr_tbctrl_idx, | |
6537 | (int) (ipa_trace_buffer_ctrl.start | |
6538 | - ipa_trace_buffer_lo), | |
6539 | (int) (ipa_trace_buffer_ctrl.free | |
6540 | - ipa_trace_buffer_lo), | |
6541 | (int) (ipa_trace_buffer_ctrl.end_free | |
6542 | - ipa_trace_buffer_lo)); | |
6543 | ||
6544 | ipa_trace_buffer_ctrl.start = ipa_trace_buffer_lo; | |
6545 | ipa_trace_buffer_ctrl.free = ipa_trace_buffer_lo; | |
6546 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_hi; | |
6547 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
6548 | } | |
6549 | ||
6550 | trace_debug ("Uploaded a traceframe\n" | |
6551 | "Lib: Trace buffer [%d] start=%d free=%d " | |
6552 | "endfree=%d wrap=%d hi=%d", | |
6553 | curr_tbctrl_idx, | |
6554 | (int) (ipa_trace_buffer_ctrl.start - ipa_trace_buffer_lo), | |
6555 | (int) (ipa_trace_buffer_ctrl.free - ipa_trace_buffer_lo), | |
493e2a69 MS |
6556 | (int) (ipa_trace_buffer_ctrl.end_free |
6557 | - ipa_trace_buffer_lo), | |
fa593d66 PA |
6558 | (int) (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo), |
6559 | (int) (ipa_trace_buffer_hi - ipa_trace_buffer_lo)); | |
6560 | } | |
6561 | ||
6562 | if (write_inferior_memory (ipa_trace_buffer_ctrl_addr, | |
6563 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
6564 | sizeof (struct ipa_trace_buffer_control))) | |
6565 | return; | |
6566 | ||
6567 | write_inferior_integer (ipa_sym_addrs.addr_traceframe_read_count, | |
6568 | ipa_traceframe_read_count); | |
6569 | ||
6570 | trace_debug ("Done uploading traceframes [%d]\n", curr_tbctrl_idx); | |
6571 | ||
6572 | pause_all (1); | |
fa593d66 PA |
6573 | |
6574 | delete_breakpoint (about_to_request_buffer_space_bkpt); | |
6575 | about_to_request_buffer_space_bkpt = NULL; | |
6576 | ||
6577 | unpause_all (1); | |
6578 | ||
6579 | if (trace_buffer_is_full) | |
6580 | stop_tracing (); | |
6581 | } | |
6582 | #endif | |
6583 | ||
6584 | #ifdef IN_PROCESS_AGENT | |
6585 | ||
3c14e5a3 PA |
6586 | IP_AGENT_EXPORT_VAR int ust_loaded; |
6587 | IP_AGENT_EXPORT_VAR char cmd_buf[IPA_CMD_BUF_SIZE]; | |
fa593d66 | 6588 | |
0fb4aa4b | 6589 | #ifdef HAVE_UST |
fa593d66 | 6590 | |
0fb4aa4b PA |
6591 | /* Static tracepoints. */ |
6592 | ||
6593 | /* UST puts a "struct tracepoint" in the global namespace, which | |
6594 | conflicts with our tracepoint. Arguably, being a library, it | |
6595 | shouldn't take ownership of such a generic name. We work around it | |
6596 | here. */ | |
6597 | #define tracepoint ust_tracepoint | |
6598 | #include <ust/ust.h> | |
6599 | #undef tracepoint | |
6600 | ||
6601 | extern int serialize_to_text (char *outbuf, int bufsize, | |
6602 | const char *fmt, va_list ap); | |
6603 | ||
6604 | #define GDB_PROBE_NAME "gdb" | |
6605 | ||
6606 | /* We dynamically search for the UST symbols instead of linking them | |
6607 | in. This lets the user decide if the application uses static | |
6608 | tracepoints, instead of always pulling libust.so in. This vector | |
6609 | holds pointers to all functions we care about. */ | |
6610 | ||
6611 | static struct | |
fa593d66 | 6612 | { |
0fb4aa4b PA |
6613 | int (*serialize_to_text) (char *outbuf, int bufsize, |
6614 | const char *fmt, va_list ap); | |
6615 | ||
6616 | int (*ltt_probe_register) (struct ltt_available_probe *pdata); | |
6617 | int (*ltt_probe_unregister) (struct ltt_available_probe *pdata); | |
6618 | ||
6619 | int (*ltt_marker_connect) (const char *channel, const char *mname, | |
6620 | const char *pname); | |
6621 | int (*ltt_marker_disconnect) (const char *channel, const char *mname, | |
6622 | const char *pname); | |
6623 | ||
6624 | void (*marker_iter_start) (struct marker_iter *iter); | |
6625 | void (*marker_iter_next) (struct marker_iter *iter); | |
6626 | void (*marker_iter_stop) (struct marker_iter *iter); | |
6627 | void (*marker_iter_reset) (struct marker_iter *iter); | |
6628 | } ust_ops; | |
6629 | ||
6630 | #include <dlfcn.h> | |
6631 | ||
6632 | /* Cast through typeof to catch incompatible API changes. Since UST | |
6633 | only builds with gcc, we can freely use gcc extensions here | |
6634 | too. */ | |
6635 | #define GET_UST_SYM(SYM) \ | |
6636 | do \ | |
6637 | { \ | |
6638 | if (ust_ops.SYM == NULL) \ | |
6639 | ust_ops.SYM = (typeof (&SYM)) dlsym (RTLD_DEFAULT, #SYM); \ | |
6640 | if (ust_ops.SYM == NULL) \ | |
6641 | return 0; \ | |
6642 | } while (0) | |
6643 | ||
6644 | #define USTF(SYM) ust_ops.SYM | |
6645 | ||
6646 | /* Get pointers to all libust.so functions we care about. */ | |
6647 | ||
6648 | static int | |
6649 | dlsym_ust (void) | |
6650 | { | |
6651 | GET_UST_SYM (serialize_to_text); | |
6652 | ||
6653 | GET_UST_SYM (ltt_probe_register); | |
6654 | GET_UST_SYM (ltt_probe_unregister); | |
6655 | GET_UST_SYM (ltt_marker_connect); | |
6656 | GET_UST_SYM (ltt_marker_disconnect); | |
6657 | ||
6658 | GET_UST_SYM (marker_iter_start); | |
6659 | GET_UST_SYM (marker_iter_next); | |
6660 | GET_UST_SYM (marker_iter_stop); | |
6661 | GET_UST_SYM (marker_iter_reset); | |
6662 | ||
6663 | ust_loaded = 1; | |
6664 | return 1; | |
fa593d66 PA |
6665 | } |
6666 | ||
0fb4aa4b PA |
6667 | /* Given an UST marker, return the matching gdb static tracepoint. |
6668 | The match is done by address. */ | |
6669 | ||
6670 | static struct tracepoint * | |
6671 | ust_marker_to_static_tracepoint (const struct marker *mdata) | |
6672 | { | |
6673 | struct tracepoint *tpoint; | |
6674 | ||
6675 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
6676 | { | |
d248b706 | 6677 | if (tpoint->type != static_tracepoint) |
0fb4aa4b PA |
6678 | continue; |
6679 | ||
6680 | if (tpoint->address == (uintptr_t) mdata->location) | |
6681 | return tpoint; | |
6682 | } | |
6683 | ||
6684 | return NULL; | |
6685 | } | |
6686 | ||
6687 | /* The probe function we install on lttng/ust markers. Whenever a | |
6688 | probed ust marker is hit, this function is called. This is similar | |
6689 | to gdb_collect, only for static tracepoints, instead of fast | |
6690 | tracepoints. */ | |
6691 | ||
6692 | static void | |
6693 | gdb_probe (const struct marker *mdata, void *probe_private, | |
6694 | struct registers *regs, void *call_private, | |
6695 | const char *fmt, va_list *args) | |
6696 | { | |
6697 | struct tracepoint *tpoint; | |
6698 | struct static_tracepoint_ctx ctx; | |
ae91f625 | 6699 | const struct target_desc *ipa_tdesc; |
0fb4aa4b PA |
6700 | |
6701 | /* Don't do anything until the trace run is completely set up. */ | |
6702 | if (!tracing) | |
6703 | { | |
6704 | trace_debug ("gdb_probe: not tracing\n"); | |
6705 | return; | |
6706 | } | |
6707 | ||
ae91f625 | 6708 | ipa_tdesc = get_ipa_tdesc (ipa_tdesc_idx); |
0fb4aa4b PA |
6709 | ctx.base.type = static_tracepoint; |
6710 | ctx.regcache_initted = 0; | |
6711 | ctx.regs = regs; | |
6712 | ctx.fmt = fmt; | |
6713 | ctx.args = args; | |
6714 | ||
6715 | /* Wrap the regblock in a register cache (in the stack, we don't | |
6716 | want to malloc here). */ | |
3aee8918 | 6717 | ctx.regspace = alloca (ipa_tdesc->registers_size); |
0fb4aa4b PA |
6718 | if (ctx.regspace == NULL) |
6719 | { | |
6720 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
6721 | return; | |
6722 | } | |
6723 | ||
6724 | tpoint = ust_marker_to_static_tracepoint (mdata); | |
6725 | if (tpoint == NULL) | |
6726 | { | |
6727 | trace_debug ("gdb_probe: marker not known: " | |
6728 | "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"", | |
6729 | mdata->location, mdata->channel, | |
6730 | mdata->name, mdata->format); | |
6731 | return; | |
6732 | } | |
6733 | ||
d248b706 KY |
6734 | if (!tpoint->enabled) |
6735 | { | |
6736 | trace_debug ("gdb_probe: tracepoint disabled"); | |
6737 | return; | |
6738 | } | |
6739 | ||
0fb4aa4b PA |
6740 | ctx.tpoint = tpoint; |
6741 | ||
6742 | trace_debug ("gdb_probe: collecting marker: " | |
6743 | "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"", | |
6744 | mdata->location, mdata->channel, | |
6745 | mdata->name, mdata->format); | |
6746 | ||
6747 | /* Test the condition if present, and collect if true. */ | |
6748 | if (tpoint->cond == NULL | |
6749 | || condition_true_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
6750 | tpoint)) | |
6751 | { | |
6752 | collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
6753 | tpoint->address, tpoint); | |
6754 | ||
6755 | if (stopping_tracepoint | |
6756 | || trace_buffer_is_full | |
6757 | || expr_eval_result != expr_eval_no_error) | |
6758 | stop_tracing (); | |
6759 | } | |
6760 | else | |
6761 | { | |
6762 | /* If there was a condition and it evaluated to false, the only | |
6763 | way we would stop tracing is if there was an error during | |
6764 | condition expression evaluation. */ | |
6765 | if (expr_eval_result != expr_eval_no_error) | |
6766 | stop_tracing (); | |
6767 | } | |
6768 | } | |
6769 | ||
6770 | /* Called if the gdb static tracepoint requested collecting "$_sdata", | |
6771 | static tracepoint string data. This is a string passed to the | |
6772 | tracing library by the user, at the time of the tracepoint marker | |
6773 | call. E.g., in the UST marker call: | |
6774 | ||
6775 | trace_mark (ust, bar33, "str %s", "FOOBAZ"); | |
6776 | ||
6777 | the collected data is "str FOOBAZ". | |
6778 | */ | |
6779 | ||
6780 | static void | |
6781 | collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
0fb4aa4b PA |
6782 | struct traceframe *tframe) |
6783 | { | |
6784 | struct static_tracepoint_ctx *umd = (struct static_tracepoint_ctx *) ctx; | |
6785 | unsigned char *bufspace; | |
6786 | int size; | |
6787 | va_list copy; | |
6788 | unsigned short blocklen; | |
6789 | ||
6790 | if (umd == NULL) | |
6791 | { | |
6792 | trace_debug ("Wanted to collect static trace data, " | |
6793 | "but there's no static trace data"); | |
6794 | return; | |
6795 | } | |
6796 | ||
6797 | va_copy (copy, *umd->args); | |
6798 | size = USTF(serialize_to_text) (NULL, 0, umd->fmt, copy); | |
6799 | va_end (copy); | |
6800 | ||
6801 | trace_debug ("Want to collect ust data"); | |
6802 | ||
6803 | /* 'S' + size + string */ | |
5ae4861a | 6804 | bufspace = add_traceframe_block (tframe, umd->tpoint, |
0fb4aa4b PA |
6805 | 1 + sizeof (blocklen) + size + 1); |
6806 | if (bufspace == NULL) | |
6807 | { | |
6808 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
6809 | return; | |
6810 | } | |
6811 | ||
6812 | /* Identify a static trace data block. */ | |
6813 | *bufspace = 'S'; | |
6814 | ||
6815 | blocklen = size + 1; | |
6816 | memcpy (bufspace + 1, &blocklen, sizeof (blocklen)); | |
6817 | ||
6818 | va_copy (copy, *umd->args); | |
6819 | USTF(serialize_to_text) ((char *) bufspace + 1 + sizeof (blocklen), | |
6820 | size + 1, umd->fmt, copy); | |
6821 | va_end (copy); | |
6822 | ||
6823 | trace_debug ("Storing static tracepoint data in regblock: %s", | |
6824 | bufspace + 1 + sizeof (blocklen)); | |
6825 | } | |
6826 | ||
6827 | /* The probe to register with lttng/ust. */ | |
6828 | static struct ltt_available_probe gdb_ust_probe = | |
6829 | { | |
6830 | GDB_PROBE_NAME, | |
6831 | NULL, | |
6832 | gdb_probe, | |
6833 | }; | |
6834 | ||
6835 | #endif /* HAVE_UST */ | |
6836 | #endif /* IN_PROCESS_AGENT */ | |
6837 | ||
0fb4aa4b PA |
6838 | #ifndef IN_PROCESS_AGENT |
6839 | ||
0fb4aa4b PA |
6840 | /* Ask the in-process agent to run a command. Since we don't want to |
6841 | have to handle the IPA hitting breakpoints while running the | |
6842 | command, we pause all threads, remove all breakpoints, and then set | |
6843 | the helper thread re-running. We communicate with the helper | |
6844 | thread by means of direct memory xfering, and a socket for | |
6845 | synchronization. */ | |
6846 | ||
6847 | static int | |
42476b70 | 6848 | run_inferior_command (char *cmd, int len) |
0fb4aa4b PA |
6849 | { |
6850 | int err = -1; | |
fbd5db48 | 6851 | int pid = ptid_get_pid (current_ptid); |
0fb4aa4b PA |
6852 | |
6853 | trace_debug ("run_inferior_command: running: %s", cmd); | |
6854 | ||
6855 | pause_all (0); | |
6856 | uninsert_all_breakpoints (); | |
6857 | ||
42476b70 | 6858 | err = agent_run_command (pid, (const char *) cmd, len); |
0fb4aa4b PA |
6859 | |
6860 | reinsert_all_breakpoints (); | |
6861 | unpause_all (0); | |
6862 | ||
6863 | return err; | |
6864 | } | |
6865 | ||
2fa291ac | 6866 | #else /* !IN_PROCESS_AGENT */ |
0fb4aa4b | 6867 | |
9eb1356e PA |
6868 | #include <sys/socket.h> |
6869 | #include <sys/un.h> | |
0fb4aa4b | 6870 | |
2fa291ac YQ |
6871 | #ifndef UNIX_PATH_MAX |
6872 | #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path) | |
6873 | #endif | |
0fb4aa4b | 6874 | |
2fa291ac YQ |
6875 | /* Where we put the socked used for synchronization. */ |
6876 | #define SOCK_DIR P_tmpdir | |
0fb4aa4b PA |
6877 | |
6878 | /* Thread ID of the helper thread. GDBserver reads this to know which | |
6879 | is the help thread. This is an LWP id on Linux. */ | |
3c14e5a3 PA |
6880 | EXTERN_C_PUSH |
6881 | IP_AGENT_EXPORT_VAR int helper_thread_id; | |
6882 | EXTERN_C_POP | |
0fb4aa4b | 6883 | |
0fb4aa4b PA |
6884 | static int |
6885 | init_named_socket (const char *name) | |
6886 | { | |
6887 | int result, fd; | |
9eb1356e | 6888 | struct sockaddr_un addr; |
0fb4aa4b PA |
6889 | |
6890 | result = fd = socket (PF_UNIX, SOCK_STREAM, 0); | |
6891 | if (result == -1) | |
6892 | { | |
6893 | warning ("socket creation failed: %s", strerror (errno)); | |
6894 | return -1; | |
6895 | } | |
6896 | ||
9eb1356e | 6897 | addr.sun_family = AF_UNIX; |
0fb4aa4b | 6898 | |
9eb1356e PA |
6899 | strncpy (addr.sun_path, name, UNIX_PATH_MAX); |
6900 | addr.sun_path[UNIX_PATH_MAX - 1] = '\0'; | |
0fb4aa4b PA |
6901 | |
6902 | result = access (name, F_OK); | |
6903 | if (result == 0) | |
6904 | { | |
6905 | /* File exists. */ | |
6906 | result = unlink (name); | |
6907 | if (result == -1) | |
6908 | { | |
6909 | warning ("unlink failed: %s", strerror (errno)); | |
6910 | close (fd); | |
6911 | return -1; | |
6912 | } | |
6913 | warning ("socket %s already exists; overwriting", name); | |
6914 | } | |
6915 | ||
9eb1356e | 6916 | result = bind (fd, (struct sockaddr *) &addr, sizeof (addr)); |
0fb4aa4b PA |
6917 | if (result == -1) |
6918 | { | |
6919 | warning ("bind failed: %s", strerror (errno)); | |
6920 | close (fd); | |
6921 | return -1; | |
6922 | } | |
6923 | ||
6924 | result = listen (fd, 1); | |
6925 | if (result == -1) | |
6926 | { | |
6927 | warning ("listen: %s", strerror (errno)); | |
6928 | close (fd); | |
6929 | return -1; | |
6930 | } | |
6931 | ||
6932 | return fd; | |
6933 | } | |
6934 | ||
7255706c YQ |
6935 | static char agent_socket_name[UNIX_PATH_MAX]; |
6936 | ||
0fb4aa4b | 6937 | static int |
2fa291ac | 6938 | gdb_agent_socket_init (void) |
0fb4aa4b PA |
6939 | { |
6940 | int result, fd; | |
0fb4aa4b | 6941 | |
7255706c | 6942 | result = xsnprintf (agent_socket_name, UNIX_PATH_MAX, "%s/gdb_ust%d", |
6cebaf6e | 6943 | SOCK_DIR, getpid ()); |
0fb4aa4b PA |
6944 | if (result >= UNIX_PATH_MAX) |
6945 | { | |
6946 | trace_debug ("string overflow allocating socket name"); | |
6947 | return -1; | |
6948 | } | |
6949 | ||
7255706c | 6950 | fd = init_named_socket (agent_socket_name); |
0fb4aa4b PA |
6951 | if (fd < 0) |
6952 | warning ("Error initializing named socket (%s) for communication with the " | |
6953 | "ust helper thread. Check that directory exists and that it " | |
7255706c | 6954 | "is writable.", agent_socket_name); |
0fb4aa4b PA |
6955 | |
6956 | return fd; | |
6957 | } | |
6958 | ||
2fa291ac | 6959 | #ifdef HAVE_UST |
0fb4aa4b PA |
6960 | |
6961 | /* The next marker to be returned on a qTsSTM command. */ | |
6962 | static const struct marker *next_st; | |
6963 | ||
6964 | /* Returns the first known marker. */ | |
6965 | ||
6966 | struct marker * | |
6967 | first_marker (void) | |
6968 | { | |
6969 | struct marker_iter iter; | |
6970 | ||
6971 | USTF(marker_iter_reset) (&iter); | |
6972 | USTF(marker_iter_start) (&iter); | |
6973 | ||
6974 | return iter.marker; | |
6975 | } | |
6976 | ||
6977 | /* Returns the marker following M. */ | |
6978 | ||
6979 | const struct marker * | |
6980 | next_marker (const struct marker *m) | |
6981 | { | |
6982 | struct marker_iter iter; | |
6983 | ||
6984 | USTF(marker_iter_reset) (&iter); | |
6985 | USTF(marker_iter_start) (&iter); | |
6986 | ||
6987 | for (; iter.marker != NULL; USTF(marker_iter_next) (&iter)) | |
6988 | { | |
6989 | if (iter.marker == m) | |
6990 | { | |
6991 | USTF(marker_iter_next) (&iter); | |
6992 | return iter.marker; | |
6993 | } | |
6994 | } | |
6995 | ||
6996 | return NULL; | |
6997 | } | |
6998 | ||
2fa291ac YQ |
6999 | /* Return an hexstr version of the STR C string, fit for sending to |
7000 | GDB. */ | |
7001 | ||
7002 | static char * | |
7003 | cstr_to_hexstr (const char *str) | |
7004 | { | |
7005 | int len = strlen (str); | |
7006 | char *hexstr = xmalloc (len * 2 + 1); | |
e9371aff | 7007 | bin2hex ((gdb_byte *) str, hexstr, len); |
2fa291ac YQ |
7008 | return hexstr; |
7009 | } | |
7010 | ||
0fb4aa4b PA |
7011 | /* Compose packet that is the response to the qTsSTM/qTfSTM/qTSTMat |
7012 | packets. */ | |
7013 | ||
7014 | static void | |
7015 | response_ust_marker (char *packet, const struct marker *st) | |
7016 | { | |
7017 | char *strid, *format, *tmp; | |
7018 | ||
7019 | next_st = next_marker (st); | |
7020 | ||
7021 | tmp = xmalloc (strlen (st->channel) + 1 + | |
7022 | strlen (st->name) + 1); | |
7023 | sprintf (tmp, "%s/%s", st->channel, st->name); | |
7024 | ||
7025 | strid = cstr_to_hexstr (tmp); | |
7026 | free (tmp); | |
7027 | ||
7028 | format = cstr_to_hexstr (st->format); | |
7029 | ||
7030 | sprintf (packet, "m%s:%s:%s", | |
7031 | paddress ((uintptr_t) st->location), | |
7032 | strid, | |
7033 | format); | |
7034 | ||
7035 | free (strid); | |
7036 | free (format); | |
7037 | } | |
7038 | ||
7039 | /* Return the first static tracepoint, and initialize the state | |
7040 | machine that will iterate through all the static tracepoints. */ | |
7041 | ||
7042 | static void | |
7043 | cmd_qtfstm (char *packet) | |
7044 | { | |
7045 | trace_debug ("Returning first trace state variable definition"); | |
7046 | ||
7047 | if (first_marker ()) | |
7048 | response_ust_marker (packet, first_marker ()); | |
7049 | else | |
7050 | strcpy (packet, "l"); | |
7051 | } | |
7052 | ||
7053 | /* Return additional trace state variable definitions. */ | |
7054 | ||
7055 | static void | |
7056 | cmd_qtsstm (char *packet) | |
7057 | { | |
7058 | trace_debug ("Returning static tracepoint"); | |
7059 | ||
7060 | if (next_st) | |
7061 | response_ust_marker (packet, next_st); | |
7062 | else | |
7063 | strcpy (packet, "l"); | |
7064 | } | |
7065 | ||
7066 | /* Disconnect the GDB probe from a marker at a given address. */ | |
7067 | ||
7068 | static void | |
7069 | unprobe_marker_at (char *packet) | |
7070 | { | |
7071 | char *p = packet; | |
7072 | ULONGEST address; | |
7073 | struct marker_iter iter; | |
7074 | ||
7075 | p += sizeof ("unprobe_marker_at:") - 1; | |
7076 | ||
7077 | p = unpack_varlen_hex (p, &address); | |
7078 | ||
7079 | USTF(marker_iter_reset) (&iter); | |
7080 | USTF(marker_iter_start) (&iter); | |
7081 | for (; iter.marker != NULL; USTF(marker_iter_next) (&iter)) | |
7082 | if ((uintptr_t ) iter.marker->location == address) | |
7083 | { | |
7084 | int result; | |
7085 | ||
7086 | result = USTF(ltt_marker_disconnect) (iter.marker->channel, | |
7087 | iter.marker->name, | |
7088 | GDB_PROBE_NAME); | |
7089 | if (result < 0) | |
7090 | warning ("could not disable marker %s/%s", | |
7091 | iter.marker->channel, iter.marker->name); | |
7092 | break; | |
7093 | } | |
7094 | } | |
7095 | ||
7096 | /* Connect the GDB probe to a marker at a given address. */ | |
7097 | ||
7098 | static int | |
7099 | probe_marker_at (char *packet) | |
7100 | { | |
7101 | char *p = packet; | |
7102 | ULONGEST address; | |
7103 | struct marker_iter iter; | |
7104 | struct marker *m; | |
7105 | ||
7106 | p += sizeof ("probe_marker_at:") - 1; | |
7107 | ||
7108 | p = unpack_varlen_hex (p, &address); | |
7109 | ||
7110 | USTF(marker_iter_reset) (&iter); | |
7111 | ||
7112 | for (USTF(marker_iter_start) (&iter), m = iter.marker; | |
7113 | m != NULL; | |
7114 | USTF(marker_iter_next) (&iter), m = iter.marker) | |
7115 | if ((uintptr_t ) m->location == address) | |
7116 | { | |
7117 | int result; | |
7118 | ||
7119 | trace_debug ("found marker for address. " | |
7120 | "ltt_marker_connect (marker = %s/%s)", | |
7121 | m->channel, m->name); | |
7122 | ||
493e2a69 MS |
7123 | result = USTF(ltt_marker_connect) (m->channel, m->name, |
7124 | GDB_PROBE_NAME); | |
0fb4aa4b PA |
7125 | if (result && result != -EEXIST) |
7126 | trace_debug ("ltt_marker_connect (marker = %s/%s, errno = %d)", | |
7127 | m->channel, m->name, -result); | |
7128 | ||
7129 | if (result < 0) | |
7130 | { | |
7131 | sprintf (packet, "E.could not connect marker: channel=%s, name=%s", | |
7132 | m->channel, m->name); | |
7133 | return -1; | |
7134 | } | |
7135 | ||
7136 | strcpy (packet, "OK"); | |
7137 | return 0; | |
7138 | } | |
7139 | ||
7140 | sprintf (packet, "E.no marker found at 0x%s", paddress (address)); | |
7141 | return -1; | |
7142 | } | |
7143 | ||
7144 | static int | |
7145 | cmd_qtstmat (char *packet) | |
7146 | { | |
7147 | char *p = packet; | |
7148 | ULONGEST address; | |
7149 | struct marker_iter iter; | |
7150 | struct marker *m; | |
7151 | ||
7152 | p += sizeof ("qTSTMat:") - 1; | |
7153 | ||
7154 | p = unpack_varlen_hex (p, &address); | |
7155 | ||
7156 | USTF(marker_iter_reset) (&iter); | |
7157 | ||
7158 | for (USTF(marker_iter_start) (&iter), m = iter.marker; | |
7159 | m != NULL; | |
7160 | USTF(marker_iter_next) (&iter), m = iter.marker) | |
7161 | if ((uintptr_t ) m->location == address) | |
7162 | { | |
7163 | response_ust_marker (packet, m); | |
7164 | return 0; | |
7165 | } | |
7166 | ||
7167 | strcpy (packet, "l"); | |
7168 | return -1; | |
7169 | } | |
7170 | ||
2fa291ac YQ |
7171 | static void |
7172 | gdb_ust_init (void) | |
7173 | { | |
7174 | if (!dlsym_ust ()) | |
7175 | return; | |
7176 | ||
7177 | USTF(ltt_probe_register) (&gdb_ust_probe); | |
7178 | } | |
7179 | ||
7180 | #endif /* HAVE_UST */ | |
7181 | ||
82067193 | 7182 | #include <sys/syscall.h> |
7255706c YQ |
7183 | |
7184 | static void | |
7185 | gdb_agent_remove_socket (void) | |
7186 | { | |
7187 | unlink (agent_socket_name); | |
7188 | } | |
82067193 | 7189 | |
2fa291ac YQ |
7190 | /* Helper thread of agent. */ |
7191 | ||
0fb4aa4b | 7192 | static void * |
2fa291ac | 7193 | gdb_agent_helper_thread (void *arg) |
0fb4aa4b PA |
7194 | { |
7195 | int listen_fd; | |
7196 | ||
7255706c YQ |
7197 | atexit (gdb_agent_remove_socket); |
7198 | ||
0fb4aa4b PA |
7199 | while (1) |
7200 | { | |
2fa291ac | 7201 | listen_fd = gdb_agent_socket_init (); |
0fb4aa4b | 7202 | |
0fb4aa4b PA |
7203 | if (helper_thread_id == 0) |
7204 | helper_thread_id = syscall (SYS_gettid); | |
0fb4aa4b PA |
7205 | |
7206 | if (listen_fd == -1) | |
7207 | { | |
7208 | warning ("could not create sync socket\n"); | |
7209 | break; | |
7210 | } | |
7211 | ||
7212 | while (1) | |
7213 | { | |
7214 | socklen_t tmp; | |
9eb1356e | 7215 | struct sockaddr_un sockaddr; |
0fb4aa4b PA |
7216 | int fd; |
7217 | char buf[1]; | |
7218 | int ret; | |
7255706c | 7219 | int stop_loop = 0; |
0fb4aa4b | 7220 | |
9eb1356e | 7221 | tmp = sizeof (sockaddr); |
0fb4aa4b PA |
7222 | |
7223 | do | |
7224 | { | |
9a9df970 | 7225 | fd = accept (listen_fd, (struct sockaddr *) &sockaddr, &tmp); |
0fb4aa4b PA |
7226 | } |
7227 | /* It seems an ERESTARTSYS can escape out of accept. */ | |
7228 | while (fd == -512 || (fd == -1 && errno == EINTR)); | |
7229 | ||
7230 | if (fd < 0) | |
7231 | { | |
7232 | warning ("Accept returned %d, error: %s\n", | |
7233 | fd, strerror (errno)); | |
7234 | break; | |
7235 | } | |
7236 | ||
7237 | do | |
7238 | { | |
7239 | ret = read (fd, buf, 1); | |
7240 | } while (ret == -1 && errno == EINTR); | |
7241 | ||
7242 | if (ret == -1) | |
7243 | { | |
7244 | warning ("reading socket (fd=%d) failed with %s", | |
7245 | fd, strerror (errno)); | |
7246 | close (fd); | |
7247 | break; | |
7248 | } | |
7249 | ||
7250 | if (cmd_buf[0]) | |
7251 | { | |
61012eef | 7252 | if (startswith (cmd_buf, "close")) |
7255706c YQ |
7253 | { |
7254 | stop_loop = 1; | |
7255 | } | |
2fa291ac | 7256 | #ifdef HAVE_UST |
7255706c | 7257 | else if (strcmp ("qTfSTM", cmd_buf) == 0) |
0fb4aa4b PA |
7258 | { |
7259 | cmd_qtfstm (cmd_buf); | |
7260 | } | |
7261 | else if (strcmp ("qTsSTM", cmd_buf) == 0) | |
7262 | { | |
7263 | cmd_qtsstm (cmd_buf); | |
7264 | } | |
61012eef | 7265 | else if (startswith (cmd_buf, "unprobe_marker_at:")) |
0fb4aa4b PA |
7266 | { |
7267 | unprobe_marker_at (cmd_buf); | |
7268 | } | |
61012eef | 7269 | else if (startswith (cmd_buf, "probe_marker_at:")) |
0fb4aa4b PA |
7270 | { |
7271 | probe_marker_at (cmd_buf); | |
7272 | } | |
61012eef | 7273 | else if (startswith (cmd_buf, "qTSTMat:")) |
0fb4aa4b PA |
7274 | { |
7275 | cmd_qtstmat (cmd_buf); | |
7276 | } | |
2fa291ac | 7277 | #endif /* HAVE_UST */ |
0fb4aa4b PA |
7278 | } |
7279 | ||
712c6575 YQ |
7280 | /* Fix compiler's warning: ignoring return value of 'write'. */ |
7281 | ret = write (fd, buf, 1); | |
0fb4aa4b | 7282 | close (fd); |
7255706c YQ |
7283 | |
7284 | if (stop_loop) | |
7285 | { | |
7286 | close (listen_fd); | |
7287 | unlink (agent_socket_name); | |
7288 | ||
7289 | /* Sleep endlessly to wait the whole inferior stops. This | |
7290 | thread can not exit because GDB or GDBserver may still need | |
0bfdf32f | 7291 | 'current_thread' (representing this thread) to access |
7255706c | 7292 | inferior memory. Otherwise, this thread exits earlier than |
0bfdf32f | 7293 | other threads, and 'current_thread' is set to NULL. */ |
7255706c YQ |
7294 | while (1) |
7295 | sleep (10); | |
7296 | } | |
0fb4aa4b PA |
7297 | } |
7298 | } | |
7299 | ||
7300 | return NULL; | |
7301 | } | |
7302 | ||
7303 | #include <signal.h> | |
2fa291ac | 7304 | #include <pthread.h> |
0fb4aa4b | 7305 | |
3c14e5a3 PA |
7306 | EXTERN_C_PUSH |
7307 | IP_AGENT_EXPORT_VAR int gdb_agent_capability = AGENT_CAPA_STATIC_TRACE; | |
7308 | EXTERN_C_POP | |
8ffcbaaf | 7309 | |
0fb4aa4b | 7310 | static void |
2fa291ac | 7311 | gdb_agent_init (void) |
0fb4aa4b PA |
7312 | { |
7313 | int res; | |
7314 | pthread_t thread; | |
7315 | sigset_t new_mask; | |
7316 | sigset_t orig_mask; | |
7317 | ||
0fb4aa4b PA |
7318 | /* We want the helper thread to be as transparent as possible, so |
7319 | have it inherit an all-signals-blocked mask. */ | |
7320 | ||
7321 | sigfillset (&new_mask); | |
7322 | res = pthread_sigmask (SIG_SETMASK, &new_mask, &orig_mask); | |
7323 | if (res) | |
14ce3192 | 7324 | perror_with_name ("pthread_sigmask (1)"); |
0fb4aa4b PA |
7325 | |
7326 | res = pthread_create (&thread, | |
7327 | NULL, | |
2fa291ac | 7328 | gdb_agent_helper_thread, |
0fb4aa4b PA |
7329 | NULL); |
7330 | ||
7331 | res = pthread_sigmask (SIG_SETMASK, &orig_mask, NULL); | |
7332 | if (res) | |
14ce3192 | 7333 | perror_with_name ("pthread_sigmask (2)"); |
0fb4aa4b PA |
7334 | |
7335 | while (helper_thread_id == 0) | |
7336 | usleep (1); | |
7337 | ||
2fa291ac YQ |
7338 | #ifdef HAVE_UST |
7339 | gdb_ust_init (); | |
7340 | #endif | |
0fb4aa4b PA |
7341 | } |
7342 | ||
0fb4aa4b PA |
7343 | #include <sys/mman.h> |
7344 | #include <fcntl.h> | |
7345 | ||
3c14e5a3 PA |
7346 | IP_AGENT_EXPORT_VAR char *gdb_tp_heap_buffer; |
7347 | IP_AGENT_EXPORT_VAR char *gdb_jump_pad_buffer; | |
7348 | IP_AGENT_EXPORT_VAR char *gdb_jump_pad_buffer_end; | |
7349 | IP_AGENT_EXPORT_VAR char *gdb_trampoline_buffer; | |
7350 | IP_AGENT_EXPORT_VAR char *gdb_trampoline_buffer_end; | |
7351 | IP_AGENT_EXPORT_VAR char *gdb_trampoline_buffer_error; | |
405f8e94 SS |
7352 | |
7353 | /* Record the result of getting buffer space for fast tracepoint | |
7354 | trampolines. Any error message is copied, since caller may not be | |
7355 | using persistent storage. */ | |
7356 | ||
7357 | void | |
7358 | set_trampoline_buffer_space (CORE_ADDR begin, CORE_ADDR end, char *errmsg) | |
7359 | { | |
7360 | gdb_trampoline_buffer = (char *) (uintptr_t) begin; | |
7361 | gdb_trampoline_buffer_end = (char *) (uintptr_t) end; | |
7362 | if (errmsg) | |
7363 | strncpy (gdb_trampoline_buffer_error, errmsg, 99); | |
7364 | else | |
7365 | strcpy (gdb_trampoline_buffer_error, "no buffer passed"); | |
7366 | } | |
0fb4aa4b PA |
7367 | |
7368 | static void __attribute__ ((constructor)) | |
7369 | initialize_tracepoint_ftlib (void) | |
7370 | { | |
7371 | initialize_tracepoint (); | |
7372 | ||
2fa291ac | 7373 | gdb_agent_init (); |
0fb4aa4b PA |
7374 | } |
7375 | ||
4dca19f8 MK |
7376 | #ifndef HAVE_GETAUXVAL |
7377 | /* Retrieve the value of TYPE from the auxiliary vector. If TYPE is not | |
7378 | found, 0 is returned. This function is provided if glibc is too old. */ | |
7379 | ||
7380 | unsigned long | |
7381 | getauxval (unsigned long type) | |
7382 | { | |
7383 | unsigned long data[2]; | |
7384 | FILE *f = fopen ("/proc/self/auxv", "r"); | |
7385 | unsigned long value = 0; | |
7386 | ||
7387 | if (f == NULL) | |
7388 | return 0; | |
7389 | ||
7390 | while (fread (data, sizeof (data), 1, f) > 0) | |
7391 | { | |
7392 | if (data[0] == type) | |
7393 | { | |
7394 | value = data[1]; | |
7395 | break; | |
7396 | } | |
7397 | } | |
7398 | ||
7399 | fclose (f); | |
7400 | return value; | |
7401 | } | |
7402 | #endif | |
7403 | ||
0fb4aa4b | 7404 | #endif /* IN_PROCESS_AGENT */ |
fa593d66 | 7405 | |
f196051f SS |
7406 | /* Return a timestamp, expressed as microseconds of the usual Unix |
7407 | time. (As the result is a 64-bit number, it will not overflow any | |
7408 | time soon.) */ | |
7409 | ||
219f2f23 | 7410 | static LONGEST |
f196051f | 7411 | get_timestamp (void) |
219f2f23 | 7412 | { |
dcb07cfa | 7413 | using namespace std::chrono; |
219f2f23 | 7414 | |
dcb07cfa PA |
7415 | steady_clock::time_point now = steady_clock::now (); |
7416 | return duration_cast<microseconds> (now.time_since_epoch ()).count (); | |
219f2f23 PA |
7417 | } |
7418 | ||
7419 | void | |
7420 | initialize_tracepoint (void) | |
7421 | { | |
f6f899bf HAQ |
7422 | /* Start with the default size. */ |
7423 | init_trace_buffer (DEFAULT_TRACE_BUFFER_SIZE); | |
219f2f23 PA |
7424 | |
7425 | /* Wire trace state variable 1 to be the timestamp. This will be | |
7426 | uploaded to GDB upon connection and become one of its trace state | |
7427 | variables. (In case you're wondering, if GDB already has a trace | |
7428 | variable numbered 1, it will be renumbered.) */ | |
fa593d66 | 7429 | create_trace_state_variable (1, 0); |
219f2f23 | 7430 | set_trace_state_variable_name (1, "trace_timestamp"); |
f196051f | 7431 | set_trace_state_variable_getter (1, get_timestamp); |
fa593d66 PA |
7432 | |
7433 | #ifdef IN_PROCESS_AGENT | |
7434 | { | |
7435 | int pagesize; | |
a13c4696 | 7436 | size_t jump_pad_size; |
fc1ab1a0 | 7437 | |
fa593d66 PA |
7438 | pagesize = sysconf (_SC_PAGE_SIZE); |
7439 | if (pagesize == -1) | |
14ce3192 | 7440 | perror_with_name ("sysconf"); |
fa593d66 | 7441 | |
fc1ab1a0 PA |
7442 | #define SCRATCH_BUFFER_NPAGES 20 |
7443 | ||
a13c4696 | 7444 | jump_pad_size = pagesize * SCRATCH_BUFFER_NPAGES; |
fa593d66 | 7445 | |
a13c4696 | 7446 | gdb_tp_heap_buffer = (char *) xmalloc (5 * 1024 * 1024); |
252db07e | 7447 | gdb_jump_pad_buffer = (char *) alloc_jump_pad_buffer (jump_pad_size); |
a13c4696 | 7448 | if (gdb_jump_pad_buffer == NULL) |
14ce3192 | 7449 | perror_with_name ("mmap"); |
a13c4696 | 7450 | gdb_jump_pad_buffer_end = gdb_jump_pad_buffer + jump_pad_size; |
fa593d66 PA |
7451 | } |
7452 | ||
405f8e94 SS |
7453 | gdb_trampoline_buffer = gdb_trampoline_buffer_end = 0; |
7454 | ||
7455 | /* It's not a fatal error for something to go wrong with trampoline | |
7456 | buffer setup, but it can be mysterious, so create a channel to | |
7457 | report back on what went wrong, using a fixed size since we may | |
7458 | not be able to allocate space later when the problem occurs. */ | |
224c3ddb | 7459 | gdb_trampoline_buffer_error = (char *) xmalloc (IPA_BUFSIZ); |
405f8e94 SS |
7460 | |
7461 | strcpy (gdb_trampoline_buffer_error, "No errors reported"); | |
7462 | ||
fa593d66 PA |
7463 | initialize_low_tracepoint (); |
7464 | #endif | |
219f2f23 | 7465 | } |