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219f2f23 PA |
1 | /* Tracepoint code for remote server for GDB. |
2 | Copyright (C) 2009, 2010 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include "server.h" | |
20 | #include <ctype.h> | |
21 | #include <fcntl.h> | |
22 | #include <unistd.h> | |
23 | #include <sys/time.h> | |
fa593d66 PA |
24 | #include <stddef.h> |
25 | #if HAVE_MALLOC_H | |
26 | #include <malloc.h> | |
27 | #endif | |
28 | #if HAVE_STDINT_H | |
29 | #include <stdint.h> | |
30 | #endif | |
219f2f23 | 31 | |
fa593d66 PA |
32 | /* This file is built for both both GDBserver, and the in-process |
33 | agent (IPA), a shared library that includes a tracing agent that is | |
34 | loaded by the inferior to support fast tracepoints. Fast | |
35 | tracepoints (or more accurately, jump based tracepoints) are | |
36 | implemented by patching the tracepoint location with a jump into a | |
37 | small trampoline function whose job is to save the register state, | |
38 | call the in-process tracing agent, and then execute the original | |
39 | instruction that was under the tracepoint jump (possibly adjusted, | |
40 | if PC-relative, or some such). | |
41 | ||
42 | The current synchronization design is pull based. That means, | |
43 | GDBserver does most of the work, by peeking/poking at the inferior | |
44 | agent's memory directly for downloading tracepoint and associated | |
45 | objects, and for uploading trace frames. Whenever the IPA needs | |
46 | something from GDBserver (trace buffer is full, tracing stopped for | |
47 | some reason, etc.) the IPA calls a corresponding hook function | |
48 | where GDBserver has placed a breakpoint. | |
49 | ||
50 | Each of the agents has its own trace buffer. When browsing the | |
51 | trace frames built from slow and fast tracepoints from GDB (tfind | |
52 | mode), there's no guarantee the user is seeing the trace frames in | |
53 | strict chronological creation order, although, GDBserver tries to | |
54 | keep the order relatively reasonable, by syncing the trace buffers | |
55 | at appropriate times. | |
56 | ||
57 | */ | |
58 | ||
59 | static void trace_vdebug (const char *, ...) ATTR_FORMAT (printf, 1, 2); | |
219f2f23 PA |
60 | |
61 | static void | |
fa593d66 | 62 | trace_vdebug (const char *fmt, ...) |
219f2f23 PA |
63 | { |
64 | char buf[1024]; | |
65 | va_list ap; | |
66 | ||
67 | va_start (ap, fmt); | |
68 | vsprintf (buf, fmt, ap); | |
69 | fprintf (stderr, "gdbserver/tracepoint: %s\n", buf); | |
70 | va_end (ap); | |
71 | } | |
72 | ||
fa593d66 | 73 | #define trace_debug_1(level, fmt, args...) \ |
219f2f23 | 74 | do { \ |
fa593d66 PA |
75 | if (level <= debug_threads) \ |
76 | trace_vdebug ((fmt), ##args); \ | |
219f2f23 PA |
77 | } while (0) |
78 | ||
fa593d66 PA |
79 | #define trace_debug(FMT, args...) \ |
80 | trace_debug_1 (1, FMT, ##args) | |
81 | ||
82 | #if defined(__GNUC__) | |
83 | # define ATTR_USED __attribute__((used)) | |
84 | # define ATTR_NOINLINE __attribute__((noinline)) | |
85 | # define ATTR_CONSTRUCTOR __attribute__ ((constructor)) | |
86 | #else | |
87 | # define ATTR_USED | |
88 | # define ATTR_NOINLINE | |
89 | # define ATTR_CONSTRUCTOR | |
90 | #endif | |
91 | ||
92 | /* Make sure the functions the IPA needs to export (symbols GDBserver | |
93 | needs to query GDB about) are exported. */ | |
94 | ||
95 | #ifdef IN_PROCESS_AGENT | |
96 | # if defined _WIN32 || defined __CYGWIN__ | |
97 | # define IP_AGENT_EXPORT __declspec(dllexport) ATTR_USED | |
98 | # else | |
99 | # if __GNUC__ >= 4 | |
100 | # define IP_AGENT_EXPORT \ | |
101 | __attribute__ ((visibility("default"))) ATTR_USED | |
102 | # else | |
103 | # define IP_AGENT_EXPORT ATTR_USED | |
104 | # endif | |
105 | # endif | |
106 | #else | |
107 | # define IP_AGENT_EXPORT | |
108 | #endif | |
109 | ||
110 | /* Prefix exported symbols, for good citizenship. All the symbols | |
111 | that need exporting are defined in this module. */ | |
112 | #ifdef IN_PROCESS_AGENT | |
113 | # define gdb_tp_heap_buffer gdb_agent_gdb_tp_heap_buffer | |
114 | # define gdb_jump_pad_buffer gdb_agent_gdb_jump_pad_buffer | |
115 | # define gdb_jump_pad_buffer_end gdb_agent_gdb_jump_pad_buffer_end | |
116 | # define collecting gdb_agent_collecting | |
117 | # define gdb_collect gdb_agent_gdb_collect | |
118 | # define stop_tracing gdb_agent_stop_tracing | |
119 | # define flush_trace_buffer gdb_agent_flush_trace_buffer | |
120 | # define about_to_request_buffer_space gdb_agent_about_to_request_buffer_space | |
121 | # define trace_buffer_is_full gdb_agent_trace_buffer_is_full | |
122 | # define stopping_tracepoint gdb_agent_stopping_tracepoint | |
123 | # define expr_eval_result gdb_agent_expr_eval_result | |
124 | # define error_tracepoint gdb_agent_error_tracepoint | |
125 | # define tracepoints gdb_agent_tracepoints | |
126 | # define tracing gdb_agent_tracing | |
127 | # define trace_buffer_ctrl gdb_agent_trace_buffer_ctrl | |
128 | # define trace_buffer_ctrl_curr gdb_agent_trace_buffer_ctrl_curr | |
129 | # define trace_buffer_lo gdb_agent_trace_buffer_lo | |
130 | # define trace_buffer_hi gdb_agent_trace_buffer_hi | |
131 | # define traceframe_read_count gdb_agent_traceframe_read_count | |
132 | # define traceframe_write_count gdb_agent_traceframe_write_count | |
133 | # define traceframes_created gdb_agent_traceframes_created | |
134 | # define trace_state_variables gdb_agent_trace_state_variables | |
135 | #endif | |
136 | ||
137 | #ifndef IN_PROCESS_AGENT | |
138 | ||
139 | /* Addresses of in-process agent's symbols GDBserver cares about. */ | |
140 | ||
141 | struct ipa_sym_addresses | |
142 | { | |
143 | CORE_ADDR addr_gdb_tp_heap_buffer; | |
144 | CORE_ADDR addr_gdb_jump_pad_buffer; | |
145 | CORE_ADDR addr_gdb_jump_pad_buffer_end; | |
146 | CORE_ADDR addr_collecting; | |
147 | CORE_ADDR addr_gdb_collect; | |
148 | CORE_ADDR addr_stop_tracing; | |
149 | CORE_ADDR addr_flush_trace_buffer; | |
150 | CORE_ADDR addr_about_to_request_buffer_space; | |
151 | CORE_ADDR addr_trace_buffer_is_full; | |
152 | CORE_ADDR addr_stopping_tracepoint; | |
153 | CORE_ADDR addr_expr_eval_result; | |
154 | CORE_ADDR addr_error_tracepoint; | |
155 | CORE_ADDR addr_tracepoints; | |
156 | CORE_ADDR addr_tracing; | |
157 | CORE_ADDR addr_trace_buffer_ctrl; | |
158 | CORE_ADDR addr_trace_buffer_ctrl_curr; | |
159 | CORE_ADDR addr_trace_buffer_lo; | |
160 | CORE_ADDR addr_trace_buffer_hi; | |
161 | CORE_ADDR addr_traceframe_read_count; | |
162 | CORE_ADDR addr_traceframe_write_count; | |
163 | CORE_ADDR addr_traceframes_created; | |
164 | CORE_ADDR addr_trace_state_variables; | |
165 | }; | |
166 | ||
167 | #define STRINGIZE_1(STR) #STR | |
168 | #define STRINGIZE(STR) STRINGIZE_1(STR) | |
169 | #define IPA_SYM(SYM) \ | |
170 | { \ | |
171 | STRINGIZE (gdb_agent_ ## SYM), \ | |
172 | offsetof (struct ipa_sym_addresses, addr_ ## SYM) \ | |
173 | } | |
174 | ||
175 | static struct | |
176 | { | |
177 | const char *name; | |
178 | int offset; | |
179 | int required; | |
180 | } symbol_list[] = { | |
181 | IPA_SYM(gdb_tp_heap_buffer), | |
182 | IPA_SYM(gdb_jump_pad_buffer), | |
183 | IPA_SYM(gdb_jump_pad_buffer_end), | |
184 | IPA_SYM(collecting), | |
185 | IPA_SYM(gdb_collect), | |
186 | IPA_SYM(stop_tracing), | |
187 | IPA_SYM(flush_trace_buffer), | |
188 | IPA_SYM(about_to_request_buffer_space), | |
189 | IPA_SYM(trace_buffer_is_full), | |
190 | IPA_SYM(stopping_tracepoint), | |
191 | IPA_SYM(expr_eval_result), | |
192 | IPA_SYM(error_tracepoint), | |
193 | IPA_SYM(tracepoints), | |
194 | IPA_SYM(tracing), | |
195 | IPA_SYM(trace_buffer_ctrl), | |
196 | IPA_SYM(trace_buffer_ctrl_curr), | |
197 | IPA_SYM(trace_buffer_lo), | |
198 | IPA_SYM(trace_buffer_hi), | |
199 | IPA_SYM(traceframe_read_count), | |
200 | IPA_SYM(traceframe_write_count), | |
201 | IPA_SYM(traceframes_created), | |
202 | IPA_SYM(trace_state_variables), | |
203 | }; | |
204 | ||
205 | struct ipa_sym_addresses ipa_sym_addrs; | |
206 | ||
207 | int all_tracepoint_symbols_looked_up; | |
208 | ||
209 | int | |
210 | in_process_agent_loaded (void) | |
211 | { | |
212 | return all_tracepoint_symbols_looked_up; | |
213 | } | |
214 | ||
215 | static int read_inferior_integer (CORE_ADDR symaddr, int *val); | |
216 | ||
217 | static void | |
218 | write_e_ipa_not_loaded (char *buffer) | |
219 | { | |
220 | sprintf (buffer, | |
221 | "E.In-process agent library not loaded in process. " | |
222 | "Dynamic tracepoints unavailable."); | |
223 | } | |
224 | ||
225 | static int | |
226 | maybe_write_ipa_not_loaded (char *buffer) | |
227 | { | |
228 | if (!in_process_agent_loaded ()) | |
229 | { | |
230 | write_e_ipa_not_loaded (buffer); | |
231 | return 1; | |
232 | } | |
233 | return 0; | |
234 | } | |
235 | ||
236 | /* Cache all future symbols that the tracepoints module might request. | |
237 | We can not request symbols at arbitrary states in the remote | |
238 | protocol, only when the client tells us that new symbols are | |
239 | available. So when we load the in-process library, make sure to | |
240 | check the entire list. */ | |
241 | ||
242 | void | |
243 | tracepoint_look_up_symbols (void) | |
244 | { | |
245 | int all_ok; | |
246 | int i; | |
247 | ||
248 | if (all_tracepoint_symbols_looked_up) | |
249 | return; | |
250 | ||
251 | all_ok = 1; | |
252 | for (i = 0; i < sizeof (symbol_list) / sizeof (symbol_list[0]); i++) | |
253 | { | |
254 | CORE_ADDR *addrp = | |
255 | (CORE_ADDR *) ((char *) &ipa_sym_addrs + symbol_list[i].offset); | |
256 | ||
257 | if (look_up_one_symbol (symbol_list[i].name, addrp, 1) == 0) | |
258 | { | |
259 | if (debug_threads) | |
260 | fprintf (stderr, "symbol `%s' not found\n", symbol_list[i].name); | |
261 | all_ok = 0; | |
262 | } | |
263 | } | |
264 | ||
265 | all_tracepoint_symbols_looked_up = all_ok; | |
266 | } | |
267 | ||
268 | #endif | |
269 | ||
270 | /* GDBserver places a breakpoint on the IPA's version (which is a nop) | |
271 | of the "stop_tracing" function. When this breakpoint is hit, | |
272 | tracing stopped in the IPA for some reason. E.g., due to | |
273 | tracepoint reaching the pass count, hitting conditional expression | |
274 | evaluation error, etc. | |
275 | ||
276 | The IPA's trace buffer is never in circular tracing mode: instead, | |
277 | GDBserver's is, and whenever the in-process buffer fills, it calls | |
278 | "flush_trace_buffer", which triggers an internal breakpoint. | |
279 | GDBserver reacts to this breakpoint by pulling the meanwhile | |
280 | collected data. Old frames discarding is always handled on the | |
281 | GDBserver side. */ | |
282 | ||
283 | #ifdef IN_PROCESS_AGENT | |
284 | int debug_threads = 0; | |
285 | ||
286 | int | |
287 | read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) | |
288 | { | |
289 | memcpy (myaddr, (void *) (uintptr_t) memaddr, len); | |
290 | return 0; | |
291 | } | |
292 | ||
293 | /* Call this in the functions where GDBserver places a breakpoint, so | |
294 | that the compiler doesn't try to be clever and skip calling the | |
295 | function at all. This is necessary, even if we tell the compiler | |
296 | to not inline said functions. */ | |
297 | ||
298 | #if defined(__GNUC__) | |
299 | # define UNKNOWN_SIDE_EFFECTS() asm ("") | |
300 | #else | |
301 | # define UNKNOWN_SIDE_EFFECTS() do {} while (0) | |
302 | #endif | |
303 | ||
304 | IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE | |
305 | stop_tracing (void) | |
306 | { | |
307 | /* GDBserver places breakpoint here. */ | |
308 | UNKNOWN_SIDE_EFFECTS(); | |
309 | } | |
310 | ||
311 | IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE | |
312 | flush_trace_buffer (void) | |
313 | { | |
314 | /* GDBserver places breakpoint here. */ | |
315 | UNKNOWN_SIDE_EFFECTS(); | |
316 | } | |
317 | ||
318 | #endif | |
319 | ||
320 | #ifndef IN_PROCESS_AGENT | |
219f2f23 PA |
321 | static int |
322 | tracepoint_handler (CORE_ADDR address) | |
323 | { | |
324 | trace_debug ("tracepoint_handler: tracepoint at 0x%s hit", | |
325 | paddress (address)); | |
326 | return 0; | |
327 | } | |
328 | ||
fa593d66 PA |
329 | /* Breakpoint at "stop_tracing" in the inferior lib. */ |
330 | struct breakpoint *stop_tracing_bkpt; | |
331 | static int stop_tracing_handler (CORE_ADDR); | |
332 | ||
333 | /* Breakpoint at "flush_trace_buffer" in the inferior lib. */ | |
334 | struct breakpoint *flush_trace_buffer_bkpt; | |
335 | static int flush_trace_buffer_handler (CORE_ADDR); | |
336 | ||
337 | static void download_tracepoints (void); | |
338 | static void download_trace_state_variables (void); | |
339 | static void upload_fast_traceframes (void); | |
340 | ||
341 | static int | |
342 | read_inferior_integer (CORE_ADDR symaddr, int *val) | |
343 | { | |
344 | return read_inferior_memory (symaddr, (unsigned char *) val, | |
345 | sizeof (*val)); | |
346 | } | |
347 | ||
348 | static int | |
349 | read_inferior_uinteger (CORE_ADDR symaddr, unsigned int *val) | |
350 | { | |
351 | return read_inferior_memory (symaddr, (unsigned char *) val, | |
352 | sizeof (*val)); | |
353 | } | |
354 | ||
355 | static int | |
356 | read_inferior_data_pointer (CORE_ADDR symaddr, CORE_ADDR *val) | |
357 | { | |
358 | void *pval = (void *) (uintptr_t) val; | |
359 | int ret; | |
360 | ||
361 | ret = read_inferior_memory (symaddr, (unsigned char *) &pval, sizeof (pval)); | |
362 | *val = (uintptr_t) pval; | |
363 | return ret; | |
364 | } | |
365 | ||
366 | static int | |
367 | write_inferior_data_pointer (CORE_ADDR symaddr, CORE_ADDR val) | |
368 | { | |
369 | void *pval = (void *) (uintptr_t) val; | |
370 | return write_inferior_memory (symaddr, | |
371 | (unsigned char *) &pval, sizeof (pval)); | |
372 | } | |
373 | ||
374 | static int | |
375 | write_inferior_integer (CORE_ADDR symaddr, int val) | |
376 | { | |
377 | return write_inferior_memory (symaddr, (unsigned char *) &val, sizeof (val)); | |
378 | } | |
379 | ||
380 | static int | |
381 | write_inferior_uinteger (CORE_ADDR symaddr, unsigned int val) | |
382 | { | |
383 | return write_inferior_memory (symaddr, (unsigned char *) &val, sizeof (val)); | |
384 | } | |
385 | ||
386 | #endif | |
387 | ||
219f2f23 PA |
388 | /* This enum must exactly match what is documented in |
389 | gdb/doc/agentexpr.texi, including all the numerical values. */ | |
390 | ||
391 | enum gdb_agent_op | |
392 | { | |
393 | gdb_agent_op_float = 0x01, | |
394 | gdb_agent_op_add = 0x02, | |
395 | gdb_agent_op_sub = 0x03, | |
396 | gdb_agent_op_mul = 0x04, | |
397 | gdb_agent_op_div_signed = 0x05, | |
398 | gdb_agent_op_div_unsigned = 0x06, | |
399 | gdb_agent_op_rem_signed = 0x07, | |
400 | gdb_agent_op_rem_unsigned = 0x08, | |
401 | gdb_agent_op_lsh = 0x09, | |
402 | gdb_agent_op_rsh_signed = 0x0a, | |
403 | gdb_agent_op_rsh_unsigned = 0x0b, | |
404 | gdb_agent_op_trace = 0x0c, | |
405 | gdb_agent_op_trace_quick = 0x0d, | |
406 | gdb_agent_op_log_not = 0x0e, | |
407 | gdb_agent_op_bit_and = 0x0f, | |
408 | gdb_agent_op_bit_or = 0x10, | |
409 | gdb_agent_op_bit_xor = 0x11, | |
410 | gdb_agent_op_bit_not = 0x12, | |
411 | gdb_agent_op_equal = 0x13, | |
412 | gdb_agent_op_less_signed = 0x14, | |
413 | gdb_agent_op_less_unsigned = 0x15, | |
414 | gdb_agent_op_ext = 0x16, | |
415 | gdb_agent_op_ref8 = 0x17, | |
416 | gdb_agent_op_ref16 = 0x18, | |
417 | gdb_agent_op_ref32 = 0x19, | |
418 | gdb_agent_op_ref64 = 0x1a, | |
419 | gdb_agent_op_ref_float = 0x1b, | |
420 | gdb_agent_op_ref_double = 0x1c, | |
421 | gdb_agent_op_ref_long_double = 0x1d, | |
422 | gdb_agent_op_l_to_d = 0x1e, | |
423 | gdb_agent_op_d_to_l = 0x1f, | |
424 | gdb_agent_op_if_goto = 0x20, | |
425 | gdb_agent_op_goto = 0x21, | |
426 | gdb_agent_op_const8 = 0x22, | |
427 | gdb_agent_op_const16 = 0x23, | |
428 | gdb_agent_op_const32 = 0x24, | |
429 | gdb_agent_op_const64 = 0x25, | |
430 | gdb_agent_op_reg = 0x26, | |
431 | gdb_agent_op_end = 0x27, | |
432 | gdb_agent_op_dup = 0x28, | |
433 | gdb_agent_op_pop = 0x29, | |
434 | gdb_agent_op_zero_ext = 0x2a, | |
435 | gdb_agent_op_swap = 0x2b, | |
436 | gdb_agent_op_getv = 0x2c, | |
437 | gdb_agent_op_setv = 0x2d, | |
438 | gdb_agent_op_tracev = 0x2e, | |
439 | gdb_agent_op_trace16 = 0x30, | |
440 | gdb_agent_op_last | |
441 | }; | |
442 | ||
443 | static const char *gdb_agent_op_names [gdb_agent_op_last] = | |
444 | { | |
445 | "?undef?", | |
446 | "float", | |
447 | "add", | |
448 | "sub", | |
449 | "mul", | |
450 | "div_signed", | |
451 | "div_unsigned", | |
452 | "rem_signed", | |
453 | "rem_unsigned", | |
454 | "lsh", | |
455 | "rsh_signed", | |
456 | "rsh_unsigned", | |
457 | "trace", | |
458 | "trace_quick", | |
459 | "log_not", | |
460 | "bit_and", | |
461 | "bit_or", | |
462 | "bit_xor", | |
463 | "bit_not", | |
464 | "equal", | |
465 | "less_signed", | |
466 | "less_unsigned", | |
467 | "ext", | |
468 | "ref8", | |
469 | "ref16", | |
470 | "ref32", | |
471 | "ref64", | |
472 | "ref_float", | |
473 | "ref_double", | |
474 | "ref_long_double", | |
475 | "l_to_d", | |
476 | "d_to_l", | |
477 | "if_goto", | |
478 | "goto", | |
479 | "const8", | |
480 | "const16", | |
481 | "const32", | |
482 | "const64", | |
483 | "reg", | |
484 | "end", | |
485 | "dup", | |
486 | "pop", | |
487 | "zero_ext", | |
488 | "swap", | |
489 | "getv", | |
490 | "setv", | |
491 | "tracev", | |
492 | "?undef?", | |
493 | "trace16", | |
494 | }; | |
495 | ||
496 | struct agent_expr | |
497 | { | |
498 | int length; | |
499 | ||
500 | unsigned char *bytes; | |
501 | }; | |
502 | ||
503 | /* Base action. Concrete actions inherit this. */ | |
504 | ||
505 | struct tracepoint_action | |
506 | { | |
507 | char type; | |
508 | }; | |
509 | ||
510 | /* An 'M' (collect memory) action. */ | |
511 | struct collect_memory_action | |
512 | { | |
513 | struct tracepoint_action base; | |
514 | ||
515 | ULONGEST addr; | |
516 | ULONGEST len; | |
517 | int basereg; | |
518 | }; | |
519 | ||
520 | /* An 'R' (collect registers) action. */ | |
521 | ||
522 | struct collect_registers_action | |
523 | { | |
524 | struct tracepoint_action base; | |
525 | }; | |
526 | ||
527 | /* An 'X' (evaluate expression) action. */ | |
528 | ||
529 | struct eval_expr_action | |
530 | { | |
531 | struct tracepoint_action base; | |
532 | ||
533 | struct agent_expr *expr; | |
534 | }; | |
535 | ||
219f2f23 PA |
536 | /* This structure describes a piece of the source-level definition of |
537 | the tracepoint. The contents are not interpreted by the target, | |
538 | but preserved verbatim for uploading upon reconnection. */ | |
539 | ||
540 | struct source_string | |
541 | { | |
542 | /* The type of string, such as "cond" for a conditional. */ | |
543 | char *type; | |
544 | ||
545 | /* The source-level string itself. For the sake of target | |
546 | debugging, we store it in plaintext, even though it is always | |
547 | transmitted in hex. */ | |
548 | char *str; | |
549 | ||
550 | /* Link to the next one in the list. We link them in the order | |
551 | received, in case some make up an ordered list of commands or | |
552 | some such. */ | |
553 | struct source_string *next; | |
554 | }; | |
555 | ||
fa593d66 PA |
556 | enum tracepoint_type |
557 | { | |
558 | /* Trap based tracepoint. */ | |
559 | trap_tracepoint, | |
560 | ||
561 | /* A fast tracepoint implemented with a jump instead of a trap. */ | |
562 | fast_tracepoint, | |
563 | }; | |
564 | ||
219f2f23 PA |
565 | struct tracepoint_hit_ctx; |
566 | ||
567 | /* The definition of a tracepoint. */ | |
568 | ||
569 | /* Tracepoints may have multiple locations, each at a different | |
570 | address. This can occur with optimizations, template | |
571 | instantiation, etc. Since the locations may be in different | |
572 | scopes, the conditions and actions may be different for each | |
573 | location. Our target version of tracepoints is more like GDB's | |
574 | notion of "breakpoint locations", but we have almost nothing that | |
575 | is not per-location, so we bother having two kinds of objects. The | |
576 | key consequence is that numbers are not unique, and that it takes | |
577 | both number and address to identify a tracepoint uniquely. */ | |
578 | ||
579 | struct tracepoint | |
580 | { | |
581 | /* The number of the tracepoint, as specified by GDB. Several | |
582 | tracepoint objects here may share a number. */ | |
583 | int number; | |
584 | ||
585 | /* Address at which the tracepoint is supposed to trigger. Several | |
586 | tracepoints may share an address. */ | |
587 | CORE_ADDR address; | |
588 | ||
fa593d66 PA |
589 | /* Tracepoint type. */ |
590 | enum tracepoint_type type; | |
591 | ||
219f2f23 PA |
592 | /* True if the tracepoint is currently enabled. */ |
593 | int enabled; | |
594 | ||
595 | /* The number of single steps that will be performed after each | |
596 | tracepoint hit. */ | |
597 | long step_count; | |
598 | ||
599 | /* The number of times the tracepoint may be hit before it will | |
600 | terminate the entire tracing run. */ | |
601 | long pass_count; | |
602 | ||
603 | /* Pointer to the agent expression that is the tracepoint's | |
604 | conditional, or NULL if the tracepoint is unconditional. */ | |
605 | struct agent_expr *cond; | |
606 | ||
607 | /* The list of actions to take when the tracepoint triggers. */ | |
608 | int numactions; | |
609 | struct tracepoint_action **actions; | |
219f2f23 PA |
610 | |
611 | /* Count of the times we've hit this tracepoint during the run. | |
612 | Note that while-stepping steps are not counted as "hits". */ | |
613 | long hit_count; | |
614 | ||
fa593d66 PA |
615 | /* Link to the next tracepoint in the list. */ |
616 | struct tracepoint *next; | |
617 | ||
618 | #ifndef IN_PROCESS_AGENT | |
619 | /* The list of actions to take when the tracepoint triggers, in | |
620 | string/packet form. */ | |
621 | char **actions_str; | |
622 | ||
219f2f23 PA |
623 | /* The collection of strings that describe the tracepoint as it was |
624 | entered into GDB. These are not used by the target, but are | |
625 | reported back to GDB upon reconnection. */ | |
626 | struct source_string *source_strings; | |
627 | ||
fa593d66 PA |
628 | /* The number of bytes displaced by fast tracepoints. It may subsume |
629 | multiple instructions, for multi-byte fast tracepoints. This | |
630 | field is only valid for fast tracepoints. */ | |
631 | int orig_size; | |
632 | ||
633 | /* Only for fast tracepoints. */ | |
634 | CORE_ADDR obj_addr_on_target; | |
635 | ||
636 | /* Address range where the original instruction under a fast | |
637 | tracepoint was relocated to. (_end is actually one byte past | |
638 | the end). */ | |
639 | CORE_ADDR adjusted_insn_addr; | |
640 | CORE_ADDR adjusted_insn_addr_end; | |
641 | ||
642 | /* The address range of the piece of the jump pad buffer that was | |
643 | assigned to this fast tracepoint. (_end is actually one byte | |
644 | past the end).*/ | |
645 | CORE_ADDR jump_pad; | |
646 | CORE_ADDR jump_pad_end; | |
647 | ||
648 | /* The list of actions to take while in a stepping loop. These | |
649 | fields are only valid for patch-based tracepoints. */ | |
650 | int num_step_actions; | |
651 | struct tracepoint_action **step_actions; | |
652 | /* Same, but in string/packet form. */ | |
653 | char **step_actions_str; | |
654 | ||
655 | /* Handle returned by the breakpoint or tracepoint module when we | |
656 | inserted the trap or jump. NULL if we haven't inserted it | |
657 | yet. */ | |
219f2f23 | 658 | void *handle; |
fa593d66 | 659 | #endif |
219f2f23 | 660 | |
219f2f23 PA |
661 | }; |
662 | ||
fa593d66 PA |
663 | #ifndef IN_PROCESS_AGENT |
664 | ||
219f2f23 PA |
665 | /* Given `while-stepping', a thread may be collecting data for more |
666 | than one tracepoint simultaneously. On the other hand, the same | |
667 | tracepoint with a while-stepping action may be hit by more than one | |
668 | thread simultaneously (but not quite, each thread could be handling | |
669 | a different step). Each thread holds a list of these objects, | |
670 | representing the current step of each while-stepping action being | |
671 | collected. */ | |
672 | ||
673 | struct wstep_state | |
674 | { | |
675 | struct wstep_state *next; | |
676 | ||
677 | /* The tracepoint number. */ | |
678 | int tp_number; | |
679 | /* The tracepoint's address. */ | |
680 | CORE_ADDR tp_address; | |
681 | ||
682 | /* The number of the current step in this 'while-stepping' | |
683 | action. */ | |
684 | long current_step; | |
685 | }; | |
686 | ||
fa593d66 PA |
687 | #endif |
688 | ||
689 | /* The linked list of all tracepoints. Marked explicitly as used as | |
690 | the in-process library doesn't use it for the fast tracepoints | |
691 | support. */ | |
692 | IP_AGENT_EXPORT struct tracepoint *tracepoints ATTR_USED; | |
219f2f23 | 693 | |
fa593d66 | 694 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
695 | |
696 | /* Pointer to the last tracepoint in the list, new tracepoints are | |
697 | linked in at the end. */ | |
698 | ||
699 | static struct tracepoint *last_tracepoint; | |
fa593d66 | 700 | #endif |
219f2f23 PA |
701 | |
702 | /* The first tracepoint to exceed its pass count. */ | |
703 | ||
fa593d66 | 704 | IP_AGENT_EXPORT struct tracepoint *stopping_tracepoint; |
219f2f23 PA |
705 | |
706 | /* True if the trace buffer is full or otherwise no longer usable. */ | |
707 | ||
fa593d66 | 708 | IP_AGENT_EXPORT int trace_buffer_is_full; |
219f2f23 PA |
709 | |
710 | /* Enumeration of the different kinds of things that can happen during | |
711 | agent expression evaluation. */ | |
712 | ||
713 | enum eval_result_type | |
714 | { | |
715 | expr_eval_no_error, | |
716 | expr_eval_empty_expression, | |
717 | expr_eval_empty_stack, | |
718 | expr_eval_stack_overflow, | |
719 | expr_eval_stack_underflow, | |
720 | expr_eval_unhandled_opcode, | |
721 | expr_eval_unrecognized_opcode, | |
722 | expr_eval_divide_by_zero, | |
723 | expr_eval_invalid_goto | |
724 | }; | |
725 | ||
726 | static enum eval_result_type expr_eval_result = expr_eval_no_error; | |
727 | ||
fa593d66 PA |
728 | #ifndef IN_PROCESS_AGENT |
729 | ||
219f2f23 PA |
730 | static const char *eval_result_names[] = |
731 | { | |
732 | "terror:in the attic", /* this should never be reported */ | |
733 | "terror:empty expression", | |
734 | "terror:empty stack", | |
735 | "terror:stack overflow", | |
736 | "terror:stack underflow", | |
737 | "terror:unhandled opcode", | |
738 | "terror:unrecognized opcode", | |
739 | "terror:divide by zero" | |
740 | }; | |
741 | ||
fa593d66 PA |
742 | #endif |
743 | ||
219f2f23 PA |
744 | /* The tracepoint in which the error occurred. */ |
745 | ||
746 | static struct tracepoint *error_tracepoint; | |
747 | ||
748 | struct trace_state_variable | |
749 | { | |
750 | /* This is the name of the variable as used in GDB. The target | |
751 | doesn't use the name, but needs to have it for saving and | |
752 | reconnection purposes. */ | |
753 | char *name; | |
754 | ||
755 | /* This number identifies the variable uniquely. Numbers may be | |
756 | assigned either by the target (in the case of builtin variables), | |
757 | or by GDB, and are presumed unique during the course of a trace | |
758 | experiment. */ | |
759 | int number; | |
760 | ||
761 | /* The variable's initial value, a 64-bit signed integer always. */ | |
762 | LONGEST initial_value; | |
763 | ||
764 | /* The variable's value, a 64-bit signed integer always. */ | |
765 | LONGEST value; | |
766 | ||
767 | /* Pointer to a getter function, used to supply computed values. */ | |
768 | LONGEST (*getter) (void); | |
769 | ||
770 | /* Link to the next variable. */ | |
771 | struct trace_state_variable *next; | |
772 | }; | |
773 | ||
774 | /* Linked list of all trace state variables. */ | |
775 | ||
fa593d66 PA |
776 | #ifdef IN_PROCESS_AGENT |
777 | struct trace_state_variable *alloced_trace_state_variables; | |
778 | #endif | |
779 | ||
780 | IP_AGENT_EXPORT struct trace_state_variable *trace_state_variables; | |
219f2f23 PA |
781 | |
782 | /* The results of tracing go into a fixed-size space known as the | |
783 | "trace buffer". Because usage follows a limited number of | |
784 | patterns, we manage it ourselves rather than with malloc. Basic | |
785 | rules are that we create only one trace frame at a time, each is | |
786 | variable in size, they are never moved once created, and we only | |
787 | discard if we are doing a circular buffer, and then only the oldest | |
788 | ones. Each trace frame includes its own size, so we don't need to | |
789 | link them together, and the trace frame number is relative to the | |
790 | first one, so we don't need to record numbers. A trace frame also | |
791 | records the number of the tracepoint that created it. The data | |
792 | itself is a series of blocks, each introduced by a single character | |
793 | and with a defined format. Each type of block has enough | |
794 | type/length info to allow scanners to jump quickly from one block | |
795 | to the next without reading each byte in the block. */ | |
796 | ||
797 | /* Trace buffer management would be simple - advance a free pointer | |
798 | from beginning to end, then stop - were it not for the circular | |
799 | buffer option, which is a useful way to prevent a trace run from | |
800 | stopping prematurely because the buffer filled up. In the circular | |
801 | case, the location of the first trace frame (trace_buffer_start) | |
802 | moves as old trace frames are discarded. Also, since we grow trace | |
803 | frames incrementally as actions are performed, we wrap around to | |
804 | the beginning of the trace buffer. This is per-block, so each | |
805 | block within a trace frame remains contiguous. Things get messy | |
806 | when the wrapped-around trace frame is the one being discarded; the | |
807 | free space ends up in two parts at opposite ends of the buffer. */ | |
808 | ||
809 | #ifndef ATTR_PACKED | |
810 | # if defined(__GNUC__) | |
811 | # define ATTR_PACKED __attribute__ ((packed)) | |
812 | # else | |
813 | # define ATTR_PACKED /* nothing */ | |
814 | # endif | |
815 | #endif | |
816 | ||
817 | /* The data collected at a tracepoint hit. This object should be as | |
818 | small as possible, since there may be a great many of them. We do | |
819 | not need to keep a frame number, because they are all sequential | |
820 | and there are no deletions; so the Nth frame in the buffer is | |
821 | always frame number N. */ | |
822 | ||
823 | struct traceframe | |
824 | { | |
825 | /* Number of the tracepoint that collected this traceframe. A value | |
826 | of 0 indicates the current end of the trace buffer. We make this | |
827 | a 16-bit field because it's never going to happen that GDB's | |
828 | numbering of tracepoints reaches 32,000. */ | |
829 | int tpnum : 16; | |
830 | ||
831 | /* The size of the data in this trace frame. We limit this to 32 | |
832 | bits, even on a 64-bit target, because it's just implausible that | |
833 | one is validly going to collect 4 gigabytes of data at a single | |
834 | tracepoint hit. */ | |
835 | unsigned int data_size : 32; | |
836 | ||
837 | /* The base of the trace data, which is contiguous from this point. */ | |
838 | unsigned char data[0]; | |
839 | ||
fa593d66 | 840 | } ATTR_PACKED; |
219f2f23 PA |
841 | |
842 | /* The traceframe to be used as the source of data to send back to | |
843 | GDB. A value of -1 means to get data from the live program. */ | |
844 | ||
845 | int current_traceframe = -1; | |
846 | ||
847 | /* This flag is true if the trace buffer is circular, meaning that | |
848 | when it fills, the oldest trace frames are discarded in order to | |
849 | make room. */ | |
850 | ||
fa593d66 | 851 | #ifndef IN_PROCESS_AGENT |
219f2f23 | 852 | static int circular_trace_buffer; |
fa593d66 | 853 | #endif |
219f2f23 PA |
854 | |
855 | /* Pointer to the block of memory that traceframes all go into. */ | |
856 | ||
857 | static unsigned char *trace_buffer_lo; | |
858 | ||
859 | /* Pointer to the end of the trace buffer, more precisely to the byte | |
860 | after the end of the buffer. */ | |
861 | ||
862 | static unsigned char *trace_buffer_hi; | |
863 | ||
fa593d66 PA |
864 | /* Control structure holding the read/write/etc. pointers into the |
865 | trace buffer. We need more than one of these to implement a | |
866 | transaction-like mechanism to garantees that both GDBserver and the | |
867 | in-process agent can try to change the trace buffer | |
868 | simultaneously. */ | |
869 | ||
870 | struct trace_buffer_control | |
871 | { | |
872 | /* Pointer to the first trace frame in the buffer. In the | |
873 | non-circular case, this is equal to trace_buffer_lo, otherwise it | |
874 | moves around in the buffer. */ | |
875 | unsigned char *start; | |
876 | ||
877 | /* Pointer to the free part of the trace buffer. Note that we clear | |
878 | several bytes at and after this pointer, so that traceframe | |
879 | scans/searches terminate properly. */ | |
880 | unsigned char *free; | |
881 | ||
882 | /* Pointer to the byte after the end of the free part. Note that | |
883 | this may be smaller than trace_buffer_free in the circular case, | |
884 | and means that the free part is in two pieces. Initially it is | |
885 | equal to trace_buffer_hi, then is generally equivalent to | |
886 | trace_buffer_start. */ | |
887 | unsigned char *end_free; | |
888 | ||
889 | /* Pointer to the wraparound. If not equal to trace_buffer_hi, then | |
890 | this is the point at which the trace data breaks, and resumes at | |
891 | trace_buffer_lo. */ | |
892 | unsigned char *wrap; | |
893 | }; | |
894 | ||
895 | /* Same as above, to be used by GDBserver when updating the in-process | |
896 | agent. */ | |
897 | struct ipa_trace_buffer_control | |
898 | { | |
899 | uintptr_t start; | |
900 | uintptr_t free; | |
901 | uintptr_t end_free; | |
902 | uintptr_t wrap; | |
903 | }; | |
904 | ||
905 | ||
906 | /* We have possibly both GDBserver and an inferior thread accessing | |
907 | the same IPA trace buffer memory. The IPA is the producer (tries | |
908 | to put new frames in the buffer), while GDBserver occasionally | |
909 | consumes them, that is, flushes the IPA's buffer into its own | |
910 | buffer. Both sides need to update the trace buffer control | |
911 | pointers (current head, tail, etc.). We can't use a global lock to | |
912 | synchronize the accesses, as otherwise we could deadlock GDBserver | |
913 | (if the thread holding the lock stops for a signal, say). So | |
914 | instead of that, we use a transaction scheme where GDBserver writes | |
915 | always prevail over the IPAs writes, and, we have the IPA detect | |
916 | the commit failure/overwrite, and retry the whole attempt. This is | |
917 | mainly implemented by having a global token object that represents | |
918 | who wrote last to the buffer control structure. We need to freeze | |
919 | any inferior writing to the buffer while GDBserver touches memory, | |
920 | so that the inferior can correctly detect that GDBserver had been | |
921 | there, otherwise, it could mistakingly think its commit was | |
922 | successful; that's implemented by simply having GDBserver set a | |
923 | breakpoint the inferior hits if it is the critical region. | |
924 | ||
925 | There are three cycling trace buffer control structure copies | |
926 | (buffer head, tail, etc.), with the token object including an index | |
927 | indicating which is current live copy. The IPA tentatively builds | |
928 | an updated copy in a non-current control structure, while GDBserver | |
929 | always clobbers the current version directly. The IPA then tries | |
930 | to atomically "commit" its version; if GDBserver clobbered the | |
931 | structure meanwhile, that will fail, and the IPA restarts the | |
932 | allocation process. | |
933 | ||
934 | Listing the step in further detail, we have: | |
935 | ||
936 | In-process agent (producer): | |
937 | ||
938 | - passes by `about_to_request_buffer_space' breakpoint/lock | |
939 | ||
940 | - reads current token, extracts current trace buffer control index, | |
941 | and starts tentatively updating the rightmost one (0->1, 1->2, | |
942 | 2->0). Note that only one inferior thread is executing this code | |
943 | at any given time, due to an outer lock in the jump pads. | |
219f2f23 | 944 | |
fa593d66 | 945 | - updates counters, and tries to commit the token. |
219f2f23 | 946 | |
fa593d66 PA |
947 | - passes by second `about_to_request_buffer_space' breakpoint/lock, |
948 | leaving the sync region. | |
219f2f23 | 949 | |
fa593d66 | 950 | - checks if the update was effective. |
219f2f23 | 951 | |
fa593d66 PA |
952 | - if trace buffer was found full, hits flush_trace_buffer |
953 | breakpoint, and restarts later afterwards. | |
219f2f23 | 954 | |
fa593d66 | 955 | GDBserver (consumer): |
219f2f23 | 956 | |
fa593d66 PA |
957 | - sets `about_to_request_buffer_space' breakpoint/lock. |
958 | ||
959 | - updates the token unconditionally, using the current buffer | |
960 | control index, since it knows that the IP agent always writes to | |
961 | the rightmost, and due to the breakpoint, at most one IP thread | |
962 | can try to update the trace buffer concurrently to GDBserver, so | |
963 | there will be no danger of trace buffer control index wrap making | |
964 | the IPA write to the same index as GDBserver. | |
965 | ||
966 | - flushes the IP agent's trace buffer completely, and updates the | |
967 | current trace buffer control structure. GDBserver *always* wins. | |
968 | ||
969 | - removes the `about_to_request_buffer_space' breakpoint. | |
970 | ||
971 | The token is stored in the `trace_buffer_ctrl_curr' variable. | |
972 | Internally, it's bits are defined as: | |
973 | ||
974 | |-------------+-----+-------------+--------+-------------+--------------| | |
975 | | Bit offsets | 31 | 30 - 20 | 19 | 18-8 | 7-0 | | |
976 | |-------------+-----+-------------+--------+-------------+--------------| | |
977 | | What | GSB | PC (11-bit) | unused | CC (11-bit) | TBCI (8-bit) | | |
978 | |-------------+-----+-------------+--------+-------------+--------------| | |
979 | ||
980 | GSB - GDBserver Stamp Bit | |
981 | PC - Previous Counter | |
982 | CC - Current Counter | |
983 | TBCI - Trace Buffer Control Index | |
984 | ||
985 | ||
986 | An IPA update of `trace_buffer_ctrl_curr' does: | |
987 | ||
988 | - read CC from the current token, save as PC. | |
989 | - updates pointers | |
990 | - atomically tries to write PC+1,CC | |
991 | ||
992 | A GDBserver update of `trace_buffer_ctrl_curr' does: | |
993 | ||
994 | - reads PC and CC from the current token. | |
995 | - updates pointers | |
996 | - writes GSB,PC,CC | |
997 | */ | |
998 | ||
999 | /* These are the bits of `trace_buffer_ctrl_curr' that are reserved | |
1000 | for the counters described below. The cleared bits are used to | |
1001 | hold the index of the items of the `trace_buffer_ctrl' array that | |
1002 | is "current". */ | |
1003 | #define GDBSERVER_FLUSH_COUNT_MASK 0xfffffff0 | |
1004 | ||
1005 | /* `trace_buffer_ctrl_curr' contains two counters. The `previous' | |
1006 | counter, and the `current' counter. */ | |
1007 | ||
1008 | #define GDBSERVER_FLUSH_COUNT_MASK_PREV 0x7ff00000 | |
1009 | #define GDBSERVER_FLUSH_COUNT_MASK_CURR 0x0007ff00 | |
1010 | ||
1011 | /* When GDBserver update the IP agent's `trace_buffer_ctrl_curr', it | |
1012 | always stamps this bit as set. */ | |
1013 | #define GDBSERVER_UPDATED_FLUSH_COUNT_BIT 0x80000000 | |
1014 | ||
1015 | #ifdef IN_PROCESS_AGENT | |
1016 | IP_AGENT_EXPORT struct trace_buffer_control trace_buffer_ctrl[3]; | |
1017 | IP_AGENT_EXPORT unsigned int trace_buffer_ctrl_curr; | |
1018 | ||
1019 | # define TRACE_BUFFER_CTRL_CURR \ | |
1020 | (trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK) | |
1021 | ||
1022 | #else | |
1023 | ||
1024 | /* The GDBserver side agent only needs one instance of this object, as | |
1025 | it doesn't need to sync with itself. Define it as array anyway so | |
1026 | that the rest of the code base doesn't need to care for the | |
1027 | difference. */ | |
1028 | struct trace_buffer_control trace_buffer_ctrl[1]; | |
1029 | # define TRACE_BUFFER_CTRL_CURR 0 | |
1030 | #endif | |
1031 | ||
1032 | /* These are convenience macros used to access the current trace | |
1033 | buffer control in effect. */ | |
1034 | #define trace_buffer_start (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].start) | |
1035 | #define trace_buffer_free (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].free) | |
1036 | #define trace_buffer_end_free \ | |
1037 | (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].end_free) | |
1038 | #define trace_buffer_wrap (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].wrap) | |
219f2f23 | 1039 | |
219f2f23 PA |
1040 | |
1041 | /* Macro that returns a pointer to the first traceframe in the buffer. */ | |
1042 | ||
1043 | #define FIRST_TRACEFRAME() ((struct traceframe *) trace_buffer_start) | |
1044 | ||
1045 | /* Macro that returns a pointer to the next traceframe in the buffer. | |
1046 | If the computed location is beyond the wraparound point, subtract | |
1047 | the offset of the wraparound. */ | |
1048 | ||
1049 | #define NEXT_TRACEFRAME_1(TF) \ | |
1050 | (((unsigned char *) (TF)) + sizeof (struct traceframe) + (TF)->data_size) | |
1051 | ||
1052 | #define NEXT_TRACEFRAME(TF) \ | |
1053 | ((struct traceframe *) (NEXT_TRACEFRAME_1 (TF) \ | |
1054 | - ((NEXT_TRACEFRAME_1 (TF) >= trace_buffer_wrap) \ | |
1055 | ? (trace_buffer_wrap - trace_buffer_lo) \ | |
1056 | : 0))) | |
1057 | ||
1058 | /* The difference between these counters represents the total number | |
fa593d66 PA |
1059 | of complete traceframes present in the trace buffer. The IP agent |
1060 | writes to the write count, GDBserver writes to read count. */ | |
219f2f23 | 1061 | |
fa593d66 PA |
1062 | IP_AGENT_EXPORT unsigned int traceframe_write_count; |
1063 | IP_AGENT_EXPORT unsigned int traceframe_read_count; | |
219f2f23 PA |
1064 | |
1065 | /* Convenience macro. */ | |
1066 | ||
1067 | #define traceframe_count \ | |
1068 | ((unsigned int) (traceframe_write_count - traceframe_read_count)) | |
1069 | ||
1070 | /* The count of all traceframes created in the current run, including | |
1071 | ones that were discarded to make room. */ | |
1072 | ||
fa593d66 PA |
1073 | IP_AGENT_EXPORT int traceframes_created; |
1074 | ||
1075 | #ifndef IN_PROCESS_AGENT | |
219f2f23 PA |
1076 | |
1077 | /* Read-only regions are address ranges whose contents don't change, | |
1078 | and so can be read from target memory even while looking at a trace | |
1079 | frame. Without these, disassembly for instance will likely fail, | |
1080 | because the program code is not usually collected into a trace | |
1081 | frame. This data structure does not need to be very complicated or | |
1082 | particularly efficient, it's only going to be used occasionally, | |
1083 | and only by some commands. */ | |
1084 | ||
1085 | struct readonly_region | |
1086 | { | |
1087 | /* The bounds of the region. */ | |
1088 | CORE_ADDR start, end; | |
1089 | ||
1090 | /* Link to the next one. */ | |
1091 | struct readonly_region *next; | |
1092 | }; | |
1093 | ||
1094 | /* Linked list of readonly regions. This list stays in effect from | |
1095 | one tstart to the next. */ | |
1096 | ||
1097 | static struct readonly_region *readonly_regions; | |
1098 | ||
fa593d66 PA |
1099 | #endif |
1100 | ||
219f2f23 PA |
1101 | /* The global that controls tracing overall. */ |
1102 | ||
fa593d66 PA |
1103 | IP_AGENT_EXPORT int tracing; |
1104 | ||
1105 | #ifndef IN_PROCESS_AGENT | |
8336d594 PA |
1106 | |
1107 | /* Controls whether tracing should continue after GDB disconnects. */ | |
1108 | ||
1109 | int disconnected_tracing; | |
219f2f23 PA |
1110 | |
1111 | /* The reason for the last tracing run to have stopped. We initialize | |
1112 | to a distinct string so that GDB can distinguish between "stopped | |
1113 | after running" and "stopped because never run" cases. */ | |
1114 | ||
1115 | static const char *tracing_stop_reason = "tnotrun"; | |
1116 | ||
1117 | static int tracing_stop_tpnum; | |
1118 | ||
fa593d66 PA |
1119 | #endif |
1120 | ||
219f2f23 PA |
1121 | /* Functions local to this file. */ |
1122 | ||
1123 | /* Base "class" for tracepoint type specific data to be passed down to | |
fa593d66 | 1124 | collect_data_at_tracepoint. */ |
219f2f23 PA |
1125 | struct tracepoint_hit_ctx |
1126 | { | |
fa593d66 | 1127 | enum tracepoint_type type; |
219f2f23 PA |
1128 | }; |
1129 | ||
fa593d66 PA |
1130 | #ifdef IN_PROCESS_AGENT |
1131 | ||
1132 | /* Fast/jump tracepoint specific data to be passed down to | |
219f2f23 | 1133 | collect_data_at_tracepoint. */ |
fa593d66 PA |
1134 | struct fast_tracepoint_ctx |
1135 | { | |
1136 | struct tracepoint_hit_ctx base; | |
1137 | ||
1138 | struct regcache regcache; | |
1139 | int regcache_initted; | |
1140 | unsigned char *regspace; | |
1141 | ||
1142 | unsigned char *regs; | |
1143 | struct tracepoint *tpoint; | |
1144 | }; | |
219f2f23 | 1145 | |
fa593d66 PA |
1146 | #else |
1147 | ||
1148 | /* Static tracepoint specific data to be passed down to | |
1149 | collect_data_at_tracepoint. */ | |
219f2f23 PA |
1150 | struct trap_tracepoint_ctx |
1151 | { | |
1152 | struct tracepoint_hit_ctx base; | |
1153 | ||
1154 | struct regcache *regcache; | |
1155 | }; | |
1156 | ||
fa593d66 PA |
1157 | #endif |
1158 | ||
1159 | #ifndef IN_PROCESS_AGENT | |
219f2f23 PA |
1160 | static struct agent_expr *parse_agent_expr (char **actparm); |
1161 | static char *unparse_agent_expr (struct agent_expr *aexpr); | |
fa593d66 | 1162 | #endif |
219f2f23 PA |
1163 | static enum eval_result_type eval_agent_expr (struct tracepoint_hit_ctx *ctx, |
1164 | struct traceframe *tframe, | |
1165 | struct agent_expr *aexpr, | |
1166 | ULONGEST *rslt); | |
1167 | ||
1168 | static int agent_mem_read (struct traceframe *tframe, | |
1169 | unsigned char *to, CORE_ADDR from, ULONGEST len); | |
1170 | static int agent_tsv_read (struct traceframe *tframe, int n); | |
1171 | ||
fa593d66 | 1172 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1173 | static CORE_ADDR traceframe_get_pc (struct traceframe *tframe); |
1174 | static int traceframe_read_tsv (int num, LONGEST *val); | |
fa593d66 | 1175 | #endif |
219f2f23 PA |
1176 | |
1177 | static int condition_true_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
1178 | struct tracepoint *tpoint); | |
1179 | ||
fa593d66 | 1180 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1181 | static void clear_readonly_regions (void); |
1182 | static void clear_installed_tracepoints (void); | |
fa593d66 | 1183 | #endif |
219f2f23 PA |
1184 | |
1185 | static void collect_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
1186 | CORE_ADDR stop_pc, | |
1187 | struct tracepoint *tpoint); | |
fa593d66 | 1188 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
1189 | static void collect_data_at_step (struct tracepoint_hit_ctx *ctx, |
1190 | CORE_ADDR stop_pc, | |
1191 | struct tracepoint *tpoint, int current_step); | |
fa593d66 | 1192 | #endif |
219f2f23 PA |
1193 | static void do_action_at_tracepoint (struct tracepoint_hit_ctx *ctx, |
1194 | CORE_ADDR stop_pc, | |
1195 | struct tracepoint *tpoint, | |
1196 | struct traceframe *tframe, | |
1197 | struct tracepoint_action *taction); | |
1198 | ||
fa593d66 PA |
1199 | #ifndef IN_PROCESS_AGENT |
1200 | static struct tracepoint *fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR); | |
1201 | #endif | |
1202 | ||
1203 | #if defined(__GNUC__) | |
1204 | # define memory_barrier() asm volatile ("" : : : "memory") | |
1205 | #else | |
1206 | # define memory_barrier() do {} while (0) | |
1207 | #endif | |
1208 | ||
1209 | /* We only build the IPA if this builtin is supported, and there are | |
1210 | no uses of this in GDBserver itself, so we're safe in defining this | |
1211 | unconditionally. */ | |
1212 | #define cmpxchg(mem, oldval, newval) \ | |
1213 | __sync_val_compare_and_swap (mem, oldval, newval) | |
1214 | ||
219f2f23 PA |
1215 | /* Record that an error occurred during expression evaluation. */ |
1216 | ||
1217 | static void | |
1218 | record_tracepoint_error (struct tracepoint *tpoint, const char *which, | |
1219 | enum eval_result_type rtype) | |
1220 | { | |
1221 | trace_debug ("Tracepoint %d at %s %s eval reports error %d", | |
1222 | tpoint->number, paddress (tpoint->address), which, rtype); | |
1223 | ||
fa593d66 PA |
1224 | #ifdef IN_PROCESS_AGENT |
1225 | /* Only record the first error we get. */ | |
1226 | if (cmpxchg (&expr_eval_result, | |
1227 | expr_eval_no_error, | |
1228 | rtype) != expr_eval_no_error) | |
1229 | return; | |
1230 | #else | |
1231 | if (expr_eval_result != expr_eval_no_error) | |
1232 | return; | |
1233 | #endif | |
1234 | ||
219f2f23 PA |
1235 | error_tracepoint = tpoint; |
1236 | } | |
1237 | ||
1238 | /* Trace buffer management. */ | |
1239 | ||
1240 | static void | |
1241 | clear_trace_buffer (void) | |
1242 | { | |
1243 | trace_buffer_start = trace_buffer_lo; | |
1244 | trace_buffer_free = trace_buffer_lo; | |
1245 | trace_buffer_end_free = trace_buffer_hi; | |
1246 | trace_buffer_wrap = trace_buffer_hi; | |
1247 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1248 | ((struct traceframe *) trace_buffer_free)->tpnum = 0; | |
1249 | ((struct traceframe *) trace_buffer_free)->data_size = 0; | |
1250 | traceframe_read_count = traceframe_write_count = 0; | |
1251 | traceframes_created = 0; | |
1252 | } | |
1253 | ||
fa593d66 PA |
1254 | #ifndef IN_PROCESS_AGENT |
1255 | ||
1256 | static void | |
1257 | clear_inferior_trace_buffer (void) | |
1258 | { | |
1259 | CORE_ADDR ipa_trace_buffer_lo; | |
1260 | CORE_ADDR ipa_trace_buffer_hi; | |
1261 | struct traceframe ipa_traceframe = { 0 }; | |
1262 | struct ipa_trace_buffer_control ipa_trace_buffer_ctrl; | |
1263 | ||
1264 | read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_lo, | |
1265 | &ipa_trace_buffer_lo); | |
1266 | read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_hi, | |
1267 | &ipa_trace_buffer_hi); | |
1268 | ||
1269 | ipa_trace_buffer_ctrl.start = ipa_trace_buffer_lo; | |
1270 | ipa_trace_buffer_ctrl.free = ipa_trace_buffer_lo; | |
1271 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_hi; | |
1272 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
1273 | ||
1274 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1275 | write_inferior_memory (ipa_sym_addrs.addr_trace_buffer_ctrl, | |
1276 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
1277 | sizeof (ipa_trace_buffer_ctrl)); | |
1278 | ||
1279 | write_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, 0); | |
1280 | ||
1281 | /* A traceframe with zeroed fields marks the end of trace data. */ | |
1282 | write_inferior_memory (ipa_trace_buffer_lo, | |
1283 | (unsigned char *) &ipa_traceframe, | |
1284 | sizeof (ipa_traceframe)); | |
1285 | ||
1286 | write_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, 0); | |
1287 | write_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, 0); | |
1288 | write_inferior_integer (ipa_sym_addrs.addr_traceframes_created, 0); | |
1289 | } | |
1290 | ||
1291 | #endif | |
1292 | ||
219f2f23 PA |
1293 | static void |
1294 | init_trace_buffer (unsigned char *buf, int bufsize) | |
1295 | { | |
1296 | trace_buffer_lo = buf; | |
1297 | trace_buffer_hi = trace_buffer_lo + bufsize; | |
1298 | ||
1299 | clear_trace_buffer (); | |
1300 | } | |
1301 | ||
fa593d66 PA |
1302 | #ifdef IN_PROCESS_AGENT |
1303 | ||
1304 | IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE | |
1305 | about_to_request_buffer_space (void) | |
1306 | { | |
1307 | /* GDBserver places breakpoint here while it goes about to flush | |
1308 | data at random times. */ | |
1309 | UNKNOWN_SIDE_EFFECTS(); | |
1310 | } | |
1311 | ||
1312 | #endif | |
1313 | ||
219f2f23 PA |
1314 | /* Carve out a piece of the trace buffer, returning NULL in case of |
1315 | failure. */ | |
1316 | ||
1317 | static void * | |
1318 | trace_buffer_alloc (size_t amt) | |
1319 | { | |
1320 | unsigned char *rslt; | |
fa593d66 PA |
1321 | struct trace_buffer_control *tbctrl; |
1322 | unsigned int curr; | |
1323 | #ifdef IN_PROCESS_AGENT | |
1324 | unsigned int prev, prev_filtered; | |
1325 | unsigned int commit_count; | |
1326 | unsigned int commit; | |
1327 | unsigned int readout; | |
1328 | #else | |
219f2f23 PA |
1329 | struct traceframe *oldest; |
1330 | unsigned char *new_start; | |
fa593d66 | 1331 | #endif |
219f2f23 PA |
1332 | |
1333 | trace_debug ("Want to allocate %ld+%ld bytes in trace buffer", | |
1334 | (long) amt, (long) sizeof (struct traceframe)); | |
1335 | ||
1336 | /* Account for the EOB marker. */ | |
1337 | amt += sizeof (struct traceframe); | |
1338 | ||
fa593d66 PA |
1339 | #ifdef IN_PROCESS_AGENT |
1340 | again: | |
1341 | memory_barrier (); | |
1342 | ||
1343 | /* Read the current token and extract the index to try to write to, | |
1344 | storing it in CURR. */ | |
1345 | prev = trace_buffer_ctrl_curr; | |
1346 | prev_filtered = prev & ~GDBSERVER_FLUSH_COUNT_MASK; | |
1347 | curr = prev_filtered + 1; | |
1348 | if (curr > 2) | |
1349 | curr = 0; | |
1350 | ||
1351 | about_to_request_buffer_space (); | |
1352 | ||
1353 | /* Start out with a copy of the current state. GDBserver may be | |
1354 | midway writing to the PREV_FILTERED TBC, but, that's OK, we won't | |
1355 | be able to commit anyway if that happens. */ | |
1356 | trace_buffer_ctrl[curr] | |
1357 | = trace_buffer_ctrl[prev_filtered]; | |
1358 | trace_debug ("trying curr=%u", curr); | |
1359 | #else | |
1360 | /* The GDBserver's agent doesn't need all that syncing, and always | |
1361 | updates TCB 0 (there's only one, mind you). */ | |
1362 | curr = 0; | |
1363 | #endif | |
1364 | tbctrl = &trace_buffer_ctrl[curr]; | |
1365 | ||
219f2f23 PA |
1366 | /* Offsets are easier to grok for debugging than raw addresses, |
1367 | especially for the small trace buffer sizes that are useful for | |
1368 | testing. */ | |
fa593d66 PA |
1369 | trace_debug ("Trace buffer [%d] start=%d free=%d endfree=%d wrap=%d hi=%d", |
1370 | curr, | |
1371 | (int) (tbctrl->start - trace_buffer_lo), | |
1372 | (int) (tbctrl->free - trace_buffer_lo), | |
1373 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1374 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1375 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1376 | ||
1377 | /* The algorithm here is to keep trying to get a contiguous block of | |
1378 | the requested size, possibly discarding older traceframes to free | |
1379 | up space. Since free space might come in one or two pieces, | |
1380 | depending on whether discarded traceframes wrapped around at the | |
1381 | high end of the buffer, we test both pieces after each | |
1382 | discard. */ | |
1383 | while (1) | |
1384 | { | |
1385 | /* First, if we have two free parts, try the upper one first. */ | |
fa593d66 | 1386 | if (tbctrl->end_free < tbctrl->free) |
219f2f23 | 1387 | { |
fa593d66 | 1388 | if (tbctrl->free + amt <= trace_buffer_hi) |
219f2f23 PA |
1389 | /* We have enough in the upper part. */ |
1390 | break; | |
1391 | else | |
1392 | { | |
1393 | /* Our high part of free space wasn't enough. Give up | |
1394 | on it for now, set wraparound. We will recover the | |
1395 | space later, if/when the wrapped-around traceframe is | |
1396 | discarded. */ | |
1397 | trace_debug ("Upper part too small, setting wraparound"); | |
fa593d66 PA |
1398 | tbctrl->wrap = tbctrl->free; |
1399 | tbctrl->free = trace_buffer_lo; | |
219f2f23 PA |
1400 | } |
1401 | } | |
1402 | ||
1403 | /* The normal case. */ | |
fa593d66 | 1404 | if (tbctrl->free + amt <= tbctrl->end_free) |
219f2f23 PA |
1405 | break; |
1406 | ||
fa593d66 PA |
1407 | #ifdef IN_PROCESS_AGENT |
1408 | /* The IP Agent's buffer is always circular. It isn't used | |
1409 | currently, but `circular_trace_buffer' could represent | |
1410 | GDBserver's mode. If we didn't find space, ask GDBserver to | |
1411 | flush. */ | |
1412 | ||
1413 | flush_trace_buffer (); | |
1414 | memory_barrier (); | |
1415 | if (tracing) | |
1416 | { | |
1417 | trace_debug ("gdbserver flushed buffer, retrying"); | |
1418 | goto again; | |
1419 | } | |
1420 | ||
1421 | /* GDBserver cancelled the tracing. Bail out as well. */ | |
1422 | return NULL; | |
1423 | #else | |
219f2f23 PA |
1424 | /* If we're here, then neither part is big enough, and |
1425 | non-circular trace buffers are now full. */ | |
1426 | if (!circular_trace_buffer) | |
1427 | { | |
1428 | trace_debug ("Not enough space in the trace buffer"); | |
1429 | return NULL; | |
1430 | } | |
1431 | ||
1432 | trace_debug ("Need more space in the trace buffer"); | |
1433 | ||
1434 | /* If we have a circular buffer, we can try discarding the | |
1435 | oldest traceframe and see if that helps. */ | |
1436 | oldest = FIRST_TRACEFRAME (); | |
1437 | if (oldest->tpnum == 0) | |
1438 | { | |
1439 | /* Not good; we have no traceframes to free. Perhaps we're | |
1440 | asking for a block that is larger than the buffer? In | |
1441 | any case, give up. */ | |
1442 | trace_debug ("No traceframes to discard"); | |
1443 | return NULL; | |
1444 | } | |
1445 | ||
fa593d66 PA |
1446 | /* We don't run this code in the in-process agent currently. |
1447 | E.g., we could leave the in-process agent in autonomous | |
1448 | circular mode if we only have fast tracepoints. If we do | |
1449 | that, then this bit becomes racy with GDBserver, which also | |
1450 | writes to this counter. */ | |
219f2f23 PA |
1451 | --traceframe_write_count; |
1452 | ||
1453 | new_start = (unsigned char *) NEXT_TRACEFRAME (oldest); | |
1454 | /* If we freed the traceframe that wrapped around, go back | |
1455 | to the non-wrap case. */ | |
fa593d66 | 1456 | if (new_start < tbctrl->start) |
219f2f23 PA |
1457 | { |
1458 | trace_debug ("Discarding past the wraparound"); | |
fa593d66 | 1459 | tbctrl->wrap = trace_buffer_hi; |
219f2f23 | 1460 | } |
fa593d66 PA |
1461 | tbctrl->start = new_start; |
1462 | tbctrl->end_free = tbctrl->start; | |
219f2f23 PA |
1463 | |
1464 | trace_debug ("Discarded a traceframe\n" | |
fa593d66 PA |
1465 | "Trace buffer [%d], start=%d free=%d " |
1466 | "endfree=%d wrap=%d hi=%d", | |
1467 | curr, | |
1468 | (int) (tbctrl->start - trace_buffer_lo), | |
1469 | (int) (tbctrl->free - trace_buffer_lo), | |
1470 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1471 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1472 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1473 | ||
1474 | /* Now go back around the loop. The discard might have resulted | |
1475 | in either one or two pieces of free space, so we want to try | |
1476 | both before freeing any more traceframes. */ | |
fa593d66 | 1477 | #endif |
219f2f23 PA |
1478 | } |
1479 | ||
1480 | /* If we get here, we know we can provide the asked-for space. */ | |
1481 | ||
fa593d66 | 1482 | rslt = tbctrl->free; |
219f2f23 PA |
1483 | |
1484 | /* Adjust the request back down, now that we know we have space for | |
fa593d66 PA |
1485 | the marker, but don't commit to AMT yet, we may still need to |
1486 | restart the operation if GDBserver touches the trace buffer | |
1487 | (obviously only important in the in-process agent's version). */ | |
1488 | tbctrl->free += (amt - sizeof (struct traceframe)); | |
1489 | ||
1490 | /* Or not. If GDBserver changed the trace buffer behind our back, | |
1491 | we get to restart a new allocation attempt. */ | |
1492 | ||
1493 | #ifdef IN_PROCESS_AGENT | |
1494 | /* Build the tentative token. */ | |
1495 | commit_count = (((prev & 0x0007ff00) + 0x100) & 0x0007ff00); | |
1496 | commit = (((prev & 0x0007ff00) << 12) | |
1497 | | commit_count | |
1498 | | curr); | |
1499 | ||
1500 | /* Try to commit it. */ | |
1501 | readout = cmpxchg (&trace_buffer_ctrl_curr, prev, commit); | |
1502 | if (readout != prev) | |
1503 | { | |
1504 | trace_debug ("GDBserver has touched the trace buffer, restarting." | |
1505 | " (prev=%08x, commit=%08x, readout=%08x)", | |
1506 | prev, commit, readout); | |
1507 | goto again; | |
1508 | } | |
219f2f23 | 1509 | |
fa593d66 PA |
1510 | /* Hold your horses here. Even if that change was committed, |
1511 | GDBserver could come in, and clobber it. We need to hold to be | |
1512 | able to tell if GDBserver clobbers before or after we committed | |
1513 | the change. Whenever GDBserver goes about touching the IPA | |
1514 | buffer, it sets a breakpoint in this routine, so we have a sync | |
1515 | point here. */ | |
1516 | about_to_request_buffer_space (); | |
219f2f23 | 1517 | |
fa593d66 PA |
1518 | /* Check if the change has been effective, even if GDBserver stopped |
1519 | us at the breakpoint. */ | |
219f2f23 | 1520 | |
fa593d66 PA |
1521 | { |
1522 | unsigned int refetch; | |
219f2f23 | 1523 | |
fa593d66 PA |
1524 | memory_barrier (); |
1525 | ||
1526 | refetch = trace_buffer_ctrl_curr; | |
1527 | ||
1528 | if ((refetch == commit | |
1529 | || ((refetch & 0x7ff00000) >> 12) == commit_count)) | |
1530 | { | |
1531 | /* effective */ | |
1532 | trace_debug ("change is effective: (prev=%08x, commit=%08x, " | |
1533 | "readout=%08x, refetch=%08x)", | |
1534 | prev, commit, readout, refetch); | |
1535 | } | |
1536 | else | |
1537 | { | |
1538 | trace_debug ("GDBserver has touched the trace buffer, not effective." | |
1539 | " (prev=%08x, commit=%08x, readout=%08x, refetch=%08x)", | |
1540 | prev, commit, readout, refetch); | |
1541 | goto again; | |
1542 | } | |
1543 | } | |
1544 | #endif | |
1545 | ||
1546 | /* We have a new piece of the trace buffer. Hurray! */ | |
1547 | ||
1548 | /* Add an EOB marker just past this allocation. */ | |
1549 | ((struct traceframe *) tbctrl->free)->tpnum = 0; | |
1550 | ((struct traceframe *) tbctrl->free)->data_size = 0; | |
1551 | ||
1552 | /* Adjust the request back down, now that we know we have space for | |
1553 | the marker. */ | |
1554 | amt -= sizeof (struct traceframe); | |
1555 | ||
1556 | if (debug_threads) | |
1557 | { | |
219f2f23 | 1558 | trace_debug ("Allocated %d bytes", (int) amt); |
fa593d66 PA |
1559 | trace_debug ("Trace buffer [%d] start=%d free=%d " |
1560 | "endfree=%d wrap=%d hi=%d", | |
1561 | curr, | |
1562 | (int) (tbctrl->start - trace_buffer_lo), | |
1563 | (int) (tbctrl->free - trace_buffer_lo), | |
1564 | (int) (tbctrl->end_free - trace_buffer_lo), | |
1565 | (int) (tbctrl->wrap - trace_buffer_lo), | |
219f2f23 PA |
1566 | (int) (trace_buffer_hi - trace_buffer_lo)); |
1567 | } | |
1568 | ||
1569 | return rslt; | |
1570 | } | |
1571 | ||
fa593d66 PA |
1572 | #ifndef IN_PROCESS_AGENT |
1573 | ||
219f2f23 PA |
1574 | /* Return the total free space. This is not necessarily the largest |
1575 | block we can allocate, because of the two-part case. */ | |
1576 | ||
1577 | static int | |
1578 | free_space (void) | |
1579 | { | |
1580 | if (trace_buffer_free <= trace_buffer_end_free) | |
1581 | return trace_buffer_end_free - trace_buffer_free; | |
1582 | else | |
1583 | return ((trace_buffer_end_free - trace_buffer_lo) | |
1584 | + (trace_buffer_hi - trace_buffer_free)); | |
1585 | } | |
1586 | ||
1587 | /* An 'S' in continuation packets indicates remainder are for | |
1588 | while-stepping. */ | |
1589 | ||
1590 | static int seen_step_action_flag; | |
1591 | ||
1592 | /* Create a tracepoint (location) with given number and address. */ | |
1593 | ||
1594 | static struct tracepoint * | |
1595 | add_tracepoint (int num, CORE_ADDR addr) | |
1596 | { | |
1597 | struct tracepoint *tpoint; | |
1598 | ||
1599 | tpoint = xmalloc (sizeof (struct tracepoint)); | |
1600 | tpoint->number = num; | |
1601 | tpoint->address = addr; | |
1602 | tpoint->numactions = 0; | |
1603 | tpoint->actions = NULL; | |
1604 | tpoint->actions_str = NULL; | |
1605 | tpoint->cond = NULL; | |
1606 | tpoint->num_step_actions = 0; | |
1607 | tpoint->step_actions = NULL; | |
1608 | tpoint->step_actions_str = NULL; | |
fa593d66 PA |
1609 | /* Start all off as regular (slow) tracepoints. */ |
1610 | tpoint->type = trap_tracepoint; | |
1611 | tpoint->orig_size = -1; | |
219f2f23 PA |
1612 | tpoint->source_strings = NULL; |
1613 | tpoint->handle = NULL; | |
1614 | tpoint->next = NULL; | |
1615 | ||
1616 | if (!last_tracepoint) | |
1617 | tracepoints = tpoint; | |
1618 | else | |
1619 | last_tracepoint->next = tpoint; | |
1620 | last_tracepoint = tpoint; | |
1621 | ||
1622 | seen_step_action_flag = 0; | |
1623 | ||
1624 | return tpoint; | |
1625 | } | |
1626 | ||
fa593d66 PA |
1627 | #ifndef IN_PROCESS_AGENT |
1628 | ||
219f2f23 PA |
1629 | /* Return the tracepoint with the given number and address, or NULL. */ |
1630 | ||
1631 | static struct tracepoint * | |
1632 | find_tracepoint (int id, CORE_ADDR addr) | |
1633 | { | |
1634 | struct tracepoint *tpoint; | |
1635 | ||
1636 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
1637 | if (tpoint->number == id && tpoint->address == addr) | |
1638 | return tpoint; | |
1639 | ||
1640 | return NULL; | |
1641 | } | |
1642 | ||
1643 | /* There may be several tracepoints with the same number (because they | |
1644 | are "locations", in GDB parlance); return the next one after the | |
1645 | given tracepoint, or search from the beginning of the list if the | |
1646 | first argument is NULL. */ | |
1647 | ||
1648 | static struct tracepoint * | |
1649 | find_next_tracepoint_by_number (struct tracepoint *prev_tp, int num) | |
1650 | { | |
1651 | struct tracepoint *tpoint; | |
1652 | ||
1653 | if (prev_tp) | |
1654 | tpoint = prev_tp->next; | |
1655 | else | |
1656 | tpoint = tracepoints; | |
1657 | for (; tpoint; tpoint = tpoint->next) | |
1658 | if (tpoint->number == num) | |
1659 | return tpoint; | |
1660 | ||
1661 | return NULL; | |
1662 | } | |
1663 | ||
fa593d66 PA |
1664 | #endif |
1665 | ||
219f2f23 PA |
1666 | static char * |
1667 | save_string (const char *str, size_t len) | |
1668 | { | |
1669 | char *s; | |
1670 | ||
1671 | s = xmalloc (len + 1); | |
1672 | memcpy (s, str, len); | |
1673 | s[len] = '\0'; | |
1674 | ||
1675 | return s; | |
1676 | } | |
1677 | ||
1678 | /* Append another action to perform when the tracepoint triggers. */ | |
1679 | ||
1680 | static void | |
1681 | add_tracepoint_action (struct tracepoint *tpoint, char *packet) | |
1682 | { | |
1683 | char *act; | |
1684 | ||
1685 | if (*packet == 'S') | |
1686 | { | |
1687 | seen_step_action_flag = 1; | |
1688 | ++packet; | |
1689 | } | |
1690 | ||
1691 | act = packet; | |
1692 | ||
1693 | while (*act) | |
1694 | { | |
1695 | char *act_start = act; | |
1696 | struct tracepoint_action *action = NULL; | |
1697 | ||
1698 | switch (*act) | |
1699 | { | |
1700 | case 'M': | |
1701 | { | |
1702 | struct collect_memory_action *maction; | |
1703 | ULONGEST basereg; | |
1704 | int is_neg; | |
1705 | ||
1706 | maction = xmalloc (sizeof *maction); | |
1707 | maction->base.type = *act; | |
1708 | action = &maction->base; | |
1709 | ||
1710 | ++act; | |
1711 | is_neg = (*act == '-'); | |
1712 | if (*act == '-') | |
1713 | ++act; | |
1714 | act = unpack_varlen_hex (act, &basereg); | |
1715 | ++act; | |
1716 | act = unpack_varlen_hex (act, &maction->addr); | |
1717 | ++act; | |
1718 | act = unpack_varlen_hex (act, &maction->len); | |
1719 | maction->basereg = (is_neg | |
1720 | ? - (int) basereg | |
1721 | : (int) basereg); | |
1722 | trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)", | |
1723 | pulongest (maction->len), | |
1724 | paddress (maction->addr), maction->basereg); | |
1725 | break; | |
1726 | } | |
1727 | case 'R': | |
1728 | { | |
1729 | struct collect_registers_action *raction; | |
1730 | ||
1731 | raction = xmalloc (sizeof *raction); | |
1732 | raction->base.type = *act; | |
1733 | action = &raction->base; | |
1734 | ||
1735 | trace_debug ("Want to collect registers"); | |
1736 | ++act; | |
1737 | /* skip past hex digits of mask for now */ | |
1738 | while (isxdigit(*act)) | |
1739 | ++act; | |
1740 | break; | |
1741 | } | |
1742 | case 'S': | |
1743 | trace_debug ("Unexpected step action, ignoring"); | |
1744 | ++act; | |
1745 | break; | |
1746 | case 'X': | |
1747 | { | |
1748 | struct eval_expr_action *xaction; | |
1749 | ||
1750 | xaction = xmalloc (sizeof (*xaction)); | |
1751 | xaction->base.type = *act; | |
1752 | action = &xaction->base; | |
1753 | ||
1754 | trace_debug ("Want to evaluate expression"); | |
1755 | xaction->expr = parse_agent_expr (&act); | |
1756 | break; | |
1757 | } | |
1758 | default: | |
1759 | trace_debug ("unknown trace action '%c', ignoring...", *act); | |
1760 | break; | |
1761 | case '-': | |
1762 | break; | |
1763 | } | |
1764 | ||
1765 | if (action == NULL) | |
1766 | break; | |
1767 | ||
1768 | if (seen_step_action_flag) | |
1769 | { | |
1770 | tpoint->num_step_actions++; | |
1771 | ||
1772 | tpoint->step_actions | |
1773 | = xrealloc (tpoint->step_actions, | |
1774 | (sizeof (*tpoint->step_actions) | |
1775 | * tpoint->num_step_actions)); | |
1776 | tpoint->step_actions_str | |
1777 | = xrealloc (tpoint->step_actions_str, | |
1778 | (sizeof (*tpoint->step_actions_str) | |
1779 | * tpoint->num_step_actions)); | |
1780 | tpoint->step_actions[tpoint->num_step_actions - 1] = action; | |
1781 | tpoint->step_actions_str[tpoint->num_step_actions - 1] | |
1782 | = save_string (act_start, act - act_start); | |
1783 | } | |
1784 | else | |
1785 | { | |
1786 | tpoint->numactions++; | |
1787 | tpoint->actions | |
1788 | = xrealloc (tpoint->actions, | |
1789 | sizeof (*tpoint->actions) * tpoint->numactions); | |
1790 | tpoint->actions_str | |
1791 | = xrealloc (tpoint->actions_str, | |
1792 | sizeof (*tpoint->actions_str) * tpoint->numactions); | |
1793 | tpoint->actions[tpoint->numactions - 1] = action; | |
1794 | tpoint->actions_str[tpoint->numactions - 1] | |
1795 | = save_string (act_start, act - act_start); | |
1796 | } | |
1797 | } | |
1798 | } | |
1799 | ||
fa593d66 PA |
1800 | #endif |
1801 | ||
219f2f23 PA |
1802 | /* Find or create a trace state variable with the given number. */ |
1803 | ||
1804 | static struct trace_state_variable * | |
1805 | get_trace_state_variable (int num) | |
1806 | { | |
1807 | struct trace_state_variable *tsv; | |
1808 | ||
fa593d66 PA |
1809 | #ifdef IN_PROCESS_AGENT |
1810 | /* Search for an existing variable. */ | |
1811 | for (tsv = alloced_trace_state_variables; tsv; tsv = tsv->next) | |
1812 | if (tsv->number == num) | |
1813 | return tsv; | |
1814 | #endif | |
1815 | ||
219f2f23 PA |
1816 | /* Search for an existing variable. */ |
1817 | for (tsv = trace_state_variables; tsv; tsv = tsv->next) | |
1818 | if (tsv->number == num) | |
1819 | return tsv; | |
1820 | ||
1821 | return NULL; | |
1822 | } | |
1823 | ||
1824 | /* Find or create a trace state variable with the given number. */ | |
1825 | ||
1826 | static struct trace_state_variable * | |
fa593d66 | 1827 | create_trace_state_variable (int num, int gdb) |
219f2f23 PA |
1828 | { |
1829 | struct trace_state_variable *tsv; | |
1830 | ||
1831 | tsv = get_trace_state_variable (num); | |
1832 | if (tsv != NULL) | |
1833 | return tsv; | |
1834 | ||
1835 | /* Create a new variable. */ | |
1836 | tsv = xmalloc (sizeof (struct trace_state_variable)); | |
1837 | tsv->number = num; | |
1838 | tsv->initial_value = 0; | |
1839 | tsv->value = 0; | |
1840 | tsv->getter = NULL; | |
1841 | tsv->name = NULL; | |
fa593d66 PA |
1842 | #ifdef IN_PROCESS_AGENT |
1843 | if (!gdb) | |
1844 | { | |
1845 | tsv->next = alloced_trace_state_variables; | |
1846 | alloced_trace_state_variables = tsv; | |
1847 | } | |
1848 | else | |
1849 | #endif | |
1850 | { | |
1851 | tsv->next = trace_state_variables; | |
1852 | trace_state_variables = tsv; | |
1853 | } | |
219f2f23 PA |
1854 | return tsv; |
1855 | } | |
1856 | ||
1857 | static LONGEST | |
1858 | get_trace_state_variable_value (int num) | |
1859 | { | |
1860 | struct trace_state_variable *tsv; | |
1861 | ||
1862 | tsv = get_trace_state_variable (num); | |
1863 | ||
1864 | if (!tsv) | |
1865 | { | |
1866 | trace_debug ("No trace state variable %d, skipping value get", num); | |
1867 | return 0; | |
1868 | } | |
1869 | ||
1870 | /* Call a getter function if we have one. While it's tempting to | |
1871 | set up something to only call the getter once per tracepoint hit, | |
1872 | it could run afoul of thread races. Better to let the getter | |
1873 | handle it directly, if necessary to worry about it. */ | |
1874 | if (tsv->getter) | |
1875 | tsv->value = (tsv->getter) (); | |
1876 | ||
1877 | trace_debug ("get_trace_state_variable_value(%d) ==> %s", | |
1878 | num, plongest (tsv->value)); | |
1879 | ||
1880 | return tsv->value; | |
1881 | } | |
1882 | ||
1883 | static void | |
1884 | set_trace_state_variable_value (int num, LONGEST val) | |
1885 | { | |
1886 | struct trace_state_variable *tsv; | |
1887 | ||
1888 | tsv = get_trace_state_variable (num); | |
1889 | ||
1890 | if (!tsv) | |
1891 | { | |
1892 | trace_debug ("No trace state variable %d, skipping value set", num); | |
1893 | return; | |
1894 | } | |
1895 | ||
1896 | tsv->value = val; | |
1897 | } | |
1898 | ||
1899 | static void | |
1900 | set_trace_state_variable_name (int num, const char *name) | |
1901 | { | |
1902 | struct trace_state_variable *tsv; | |
1903 | ||
1904 | tsv = get_trace_state_variable (num); | |
1905 | ||
1906 | if (!tsv) | |
1907 | { | |
1908 | trace_debug ("No trace state variable %d, skipping name set", num); | |
1909 | return; | |
1910 | } | |
1911 | ||
1912 | tsv->name = (char *) name; | |
1913 | } | |
1914 | ||
1915 | static void | |
1916 | set_trace_state_variable_getter (int num, LONGEST (*getter) (void)) | |
1917 | { | |
1918 | struct trace_state_variable *tsv; | |
1919 | ||
1920 | tsv = get_trace_state_variable (num); | |
1921 | ||
1922 | if (!tsv) | |
1923 | { | |
1924 | trace_debug ("No trace state variable %d, skipping getter set", num); | |
1925 | return; | |
1926 | } | |
1927 | ||
1928 | tsv->getter = getter; | |
1929 | } | |
1930 | ||
1931 | /* Add a raw traceframe for the given tracepoint. */ | |
1932 | ||
1933 | static struct traceframe * | |
1934 | add_traceframe (struct tracepoint *tpoint) | |
1935 | { | |
1936 | struct traceframe *tframe; | |
1937 | ||
1938 | tframe = trace_buffer_alloc (sizeof (struct traceframe)); | |
1939 | ||
1940 | if (tframe == NULL) | |
1941 | return NULL; | |
1942 | ||
1943 | tframe->tpnum = tpoint->number; | |
1944 | tframe->data_size = 0; | |
1945 | ||
1946 | return tframe; | |
1947 | } | |
1948 | ||
1949 | /* Add a block to the traceframe currently being worked on. */ | |
1950 | ||
1951 | static unsigned char * | |
1952 | add_traceframe_block (struct traceframe *tframe, int amt) | |
1953 | { | |
1954 | unsigned char *block; | |
1955 | ||
1956 | if (!tframe) | |
1957 | return NULL; | |
1958 | ||
1959 | block = trace_buffer_alloc (amt); | |
1960 | ||
1961 | if (!block) | |
1962 | return NULL; | |
1963 | ||
1964 | tframe->data_size += amt; | |
1965 | ||
1966 | return block; | |
1967 | } | |
1968 | ||
1969 | /* Flag that the current traceframe is finished. */ | |
1970 | ||
1971 | static void | |
1972 | finish_traceframe (struct traceframe *tframe) | |
1973 | { | |
1974 | ++traceframe_write_count; | |
1975 | ++traceframes_created; | |
1976 | } | |
1977 | ||
fa593d66 PA |
1978 | #ifndef IN_PROCESS_AGENT |
1979 | ||
219f2f23 PA |
1980 | /* Given a traceframe number NUM, find the NUMth traceframe in the |
1981 | buffer. */ | |
1982 | ||
1983 | static struct traceframe * | |
1984 | find_traceframe (int num) | |
1985 | { | |
1986 | struct traceframe *tframe; | |
1987 | int tfnum = 0; | |
1988 | ||
1989 | for (tframe = FIRST_TRACEFRAME (); | |
1990 | tframe->tpnum != 0; | |
1991 | tframe = NEXT_TRACEFRAME (tframe)) | |
1992 | { | |
1993 | if (tfnum == num) | |
1994 | return tframe; | |
1995 | ++tfnum; | |
1996 | } | |
1997 | ||
1998 | return NULL; | |
1999 | } | |
2000 | ||
2001 | static CORE_ADDR | |
2002 | get_traceframe_address (struct traceframe *tframe) | |
2003 | { | |
2004 | CORE_ADDR addr; | |
2005 | struct tracepoint *tpoint; | |
2006 | ||
2007 | addr = traceframe_get_pc (tframe); | |
2008 | ||
2009 | if (addr) | |
2010 | return addr; | |
2011 | ||
2012 | /* Fallback strategy, will be incorrect for while-stepping frames | |
2013 | and multi-location tracepoints. */ | |
2014 | tpoint = find_next_tracepoint_by_number (NULL, tframe->tpnum); | |
2015 | return tpoint->address; | |
2016 | } | |
2017 | ||
2018 | /* Search for the next traceframe whose address is inside or outside | |
2019 | the given range. */ | |
2020 | ||
2021 | static struct traceframe * | |
2022 | find_next_traceframe_in_range (CORE_ADDR lo, CORE_ADDR hi, int inside_p, | |
2023 | int *tfnump) | |
2024 | { | |
2025 | struct traceframe *tframe; | |
2026 | CORE_ADDR tfaddr; | |
2027 | ||
2028 | *tfnump = current_traceframe + 1; | |
2029 | tframe = find_traceframe (*tfnump); | |
2030 | /* The search is not supposed to wrap around. */ | |
2031 | if (!tframe) | |
2032 | { | |
2033 | *tfnump = -1; | |
2034 | return NULL; | |
2035 | } | |
2036 | ||
2037 | for (; tframe->tpnum != 0; tframe = NEXT_TRACEFRAME (tframe)) | |
2038 | { | |
2039 | tfaddr = get_traceframe_address (tframe); | |
2040 | if (inside_p | |
2041 | ? (lo <= tfaddr && tfaddr <= hi) | |
2042 | : (lo > tfaddr || tfaddr > hi)) | |
2043 | return tframe; | |
2044 | ++*tfnump; | |
2045 | } | |
2046 | ||
2047 | *tfnump = -1; | |
2048 | return NULL; | |
2049 | } | |
2050 | ||
2051 | /* Search for the next traceframe recorded by the given tracepoint. | |
2052 | Note that for multi-location tracepoints, this will find whatever | |
2053 | location appears first. */ | |
2054 | ||
2055 | static struct traceframe * | |
2056 | find_next_traceframe_by_tracepoint (int num, int *tfnump) | |
2057 | { | |
2058 | struct traceframe *tframe; | |
2059 | ||
2060 | *tfnump = current_traceframe + 1; | |
2061 | tframe = find_traceframe (*tfnump); | |
2062 | /* The search is not supposed to wrap around. */ | |
2063 | if (!tframe) | |
2064 | { | |
2065 | *tfnump = -1; | |
2066 | return NULL; | |
2067 | } | |
2068 | ||
2069 | for (; tframe->tpnum != 0; tframe = NEXT_TRACEFRAME (tframe)) | |
2070 | { | |
2071 | if (tframe->tpnum == num) | |
2072 | return tframe; | |
2073 | ++*tfnump; | |
2074 | } | |
2075 | ||
2076 | *tfnump = -1; | |
2077 | return NULL; | |
2078 | } | |
2079 | ||
fa593d66 PA |
2080 | #endif |
2081 | ||
2082 | #ifndef IN_PROCESS_AGENT | |
2083 | ||
219f2f23 PA |
2084 | /* Clear all past trace state. */ |
2085 | ||
2086 | static void | |
2087 | cmd_qtinit (char *packet) | |
2088 | { | |
2089 | struct trace_state_variable *tsv, *prev, *next; | |
2090 | ||
2091 | /* Make sure we don't try to read from a trace frame. */ | |
2092 | current_traceframe = -1; | |
2093 | ||
2094 | trace_debug ("Initializing the trace"); | |
2095 | ||
2096 | clear_installed_tracepoints (); | |
2097 | clear_readonly_regions (); | |
2098 | ||
2099 | tracepoints = NULL; | |
2100 | last_tracepoint = NULL; | |
2101 | ||
2102 | /* Clear out any leftover trace state variables. Ones with target | |
2103 | defined getters should be kept however. */ | |
2104 | prev = NULL; | |
2105 | tsv = trace_state_variables; | |
2106 | while (tsv) | |
2107 | { | |
2108 | trace_debug ("Looking at var %d", tsv->number); | |
2109 | if (tsv->getter == NULL) | |
2110 | { | |
2111 | next = tsv->next; | |
2112 | if (prev) | |
2113 | prev->next = next; | |
2114 | else | |
2115 | trace_state_variables = next; | |
2116 | trace_debug ("Deleting var %d", tsv->number); | |
2117 | free (tsv); | |
2118 | tsv = next; | |
2119 | } | |
2120 | else | |
2121 | { | |
2122 | prev = tsv; | |
2123 | tsv = tsv->next; | |
2124 | } | |
2125 | } | |
2126 | ||
2127 | clear_trace_buffer (); | |
fa593d66 | 2128 | clear_inferior_trace_buffer (); |
219f2f23 PA |
2129 | |
2130 | write_ok (packet); | |
2131 | } | |
2132 | ||
2133 | /* Restore the program to its pre-tracing state. This routine may be called | |
2134 | in error situations, so it needs to be careful about only restoring | |
2135 | from known-valid bits. */ | |
2136 | ||
2137 | static void | |
2138 | clear_installed_tracepoints (void) | |
2139 | { | |
2140 | struct tracepoint *tpoint; | |
2141 | struct tracepoint *prev_stpoint; | |
2142 | ||
7984d532 PA |
2143 | pause_all (1); |
2144 | cancel_breakpoints (); | |
2145 | ||
219f2f23 PA |
2146 | prev_stpoint = NULL; |
2147 | ||
2148 | /* Restore any bytes overwritten by tracepoints. */ | |
2149 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
2150 | { | |
2151 | if (!tpoint->enabled) | |
2152 | continue; | |
2153 | ||
2154 | /* Catch the case where we might try to remove a tracepoint that | |
2155 | was never actually installed. */ | |
2156 | if (tpoint->handle == NULL) | |
2157 | { | |
2158 | trace_debug ("Tracepoint %d at 0x%s was " | |
2159 | "never installed, nothing to clear", | |
2160 | tpoint->number, paddress (tpoint->address)); | |
2161 | continue; | |
2162 | } | |
2163 | ||
fa593d66 PA |
2164 | switch (tpoint->type) |
2165 | { | |
2166 | case trap_tracepoint: | |
2167 | delete_breakpoint (tpoint->handle); | |
2168 | break; | |
2169 | case fast_tracepoint: | |
2170 | delete_fast_tracepoint_jump (tpoint->handle); | |
2171 | break; | |
2172 | } | |
2173 | ||
219f2f23 PA |
2174 | tpoint->handle = NULL; |
2175 | } | |
7984d532 PA |
2176 | |
2177 | unpause_all (1); | |
219f2f23 PA |
2178 | } |
2179 | ||
2180 | /* Parse a packet that defines a tracepoint. */ | |
2181 | ||
2182 | static void | |
2183 | cmd_qtdp (char *own_buf) | |
2184 | { | |
2185 | int tppacket; | |
2186 | ULONGEST num; | |
2187 | ULONGEST addr; | |
2188 | ULONGEST count; | |
2189 | struct tracepoint *tpoint; | |
2190 | char *actparm; | |
2191 | char *packet = own_buf; | |
2192 | ||
2193 | packet += strlen ("QTDP:"); | |
2194 | ||
2195 | /* A hyphen at the beginning marks a packet specifying actions for a | |
2196 | tracepoint already supplied. */ | |
2197 | tppacket = 1; | |
2198 | if (*packet == '-') | |
2199 | { | |
2200 | tppacket = 0; | |
2201 | ++packet; | |
2202 | } | |
2203 | packet = unpack_varlen_hex (packet, &num); | |
2204 | ++packet; /* skip a colon */ | |
2205 | packet = unpack_varlen_hex (packet, &addr); | |
2206 | ++packet; /* skip a colon */ | |
2207 | ||
2208 | /* See if we already have this tracepoint. */ | |
2209 | tpoint = find_tracepoint (num, addr); | |
2210 | ||
2211 | if (tppacket) | |
2212 | { | |
2213 | /* Duplicate tracepoints are never allowed. */ | |
2214 | if (tpoint) | |
2215 | { | |
2216 | trace_debug ("Tracepoint error: tracepoint %d" | |
2217 | " at 0x%s already exists", | |
2218 | (int) num, paddress (addr)); | |
2219 | write_enn (own_buf); | |
2220 | return; | |
2221 | } | |
2222 | ||
2223 | tpoint = add_tracepoint (num, addr); | |
2224 | ||
2225 | tpoint->enabled = (*packet == 'E'); | |
2226 | ++packet; /* skip 'E' */ | |
2227 | ++packet; /* skip a colon */ | |
2228 | packet = unpack_varlen_hex (packet, &count); | |
2229 | tpoint->step_count = count; | |
2230 | ++packet; /* skip a colon */ | |
2231 | packet = unpack_varlen_hex (packet, &count); | |
2232 | tpoint->pass_count = count; | |
2233 | /* See if we have any of the additional optional fields. */ | |
2234 | while (*packet == ':') | |
2235 | { | |
2236 | ++packet; | |
fa593d66 PA |
2237 | if (*packet == 'F') |
2238 | { | |
2239 | tpoint->type = fast_tracepoint; | |
2240 | ++packet; | |
2241 | packet = unpack_varlen_hex (packet, &count); | |
2242 | tpoint->orig_size = count; | |
2243 | } | |
2244 | else if (*packet == 'X') | |
219f2f23 PA |
2245 | { |
2246 | actparm = (char *) packet; | |
2247 | tpoint->cond = parse_agent_expr (&actparm); | |
2248 | packet = actparm; | |
2249 | } | |
2250 | else if (*packet == '-') | |
2251 | break; | |
2252 | else if (*packet == '\0') | |
2253 | break; | |
2254 | else | |
2255 | trace_debug ("Unknown optional tracepoint field"); | |
2256 | } | |
2257 | if (*packet == '-') | |
2258 | trace_debug ("Also has actions\n"); | |
2259 | ||
fa593d66 | 2260 | trace_debug ("Defined %stracepoint %d at 0x%s, " |
219f2f23 | 2261 | "enabled %d step %ld pass %ld", |
fa593d66 PA |
2262 | tpoint->type == fast_tracepoint ? "fast " |
2263 | : "", | |
2264 | tpoint->number, paddress (tpoint->address), tpoint->enabled, | |
219f2f23 PA |
2265 | tpoint->step_count, tpoint->pass_count); |
2266 | } | |
2267 | else if (tpoint) | |
2268 | add_tracepoint_action (tpoint, packet); | |
2269 | else | |
2270 | { | |
2271 | trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found", | |
2272 | (int) num, paddress (addr)); | |
2273 | write_enn (own_buf); | |
2274 | return; | |
2275 | } | |
2276 | ||
2277 | write_ok (own_buf); | |
2278 | } | |
2279 | ||
2280 | static void | |
2281 | cmd_qtdpsrc (char *own_buf) | |
2282 | { | |
2283 | ULONGEST num, addr, start, slen; | |
2284 | struct tracepoint *tpoint; | |
2285 | char *packet = own_buf; | |
2286 | char *saved, *srctype, *src; | |
2287 | size_t nbytes; | |
2288 | struct source_string *last, *newlast; | |
2289 | ||
2290 | packet += strlen ("QTDPsrc:"); | |
2291 | ||
2292 | packet = unpack_varlen_hex (packet, &num); | |
2293 | ++packet; /* skip a colon */ | |
2294 | packet = unpack_varlen_hex (packet, &addr); | |
2295 | ++packet; /* skip a colon */ | |
2296 | ||
2297 | /* See if we already have this tracepoint. */ | |
2298 | tpoint = find_tracepoint (num, addr); | |
2299 | ||
2300 | if (!tpoint) | |
2301 | { | |
2302 | trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found", | |
2303 | (int) num, paddress (addr)); | |
2304 | write_enn (own_buf); | |
2305 | return; | |
2306 | } | |
2307 | ||
2308 | saved = packet; | |
2309 | packet = strchr (packet, ':'); | |
2310 | srctype = xmalloc (packet - saved + 1); | |
2311 | memcpy (srctype, saved, packet - saved); | |
2312 | srctype[packet - saved] = '\0'; | |
2313 | ++packet; | |
2314 | packet = unpack_varlen_hex (packet, &start); | |
2315 | ++packet; /* skip a colon */ | |
2316 | packet = unpack_varlen_hex (packet, &slen); | |
2317 | ++packet; /* skip a colon */ | |
2318 | src = xmalloc (slen + 1); | |
2319 | nbytes = unhexify (src, packet, strlen (packet) / 2); | |
2320 | src[nbytes] = '\0'; | |
2321 | ||
2322 | newlast = xmalloc (sizeof (struct source_string)); | |
2323 | newlast->type = srctype; | |
2324 | newlast->str = src; | |
2325 | newlast->next = NULL; | |
2326 | /* Always add a source string to the end of the list; | |
2327 | this keeps sequences of actions/commands in the right | |
2328 | order. */ | |
2329 | if (tpoint->source_strings) | |
2330 | { | |
2331 | for (last = tpoint->source_strings; last->next; last = last->next) | |
2332 | ; | |
2333 | last->next = newlast; | |
2334 | } | |
2335 | else | |
2336 | tpoint->source_strings = newlast; | |
2337 | ||
2338 | write_ok (own_buf); | |
2339 | } | |
2340 | ||
2341 | static void | |
2342 | cmd_qtdv (char *own_buf) | |
2343 | { | |
2344 | ULONGEST num, val, builtin; | |
2345 | char *varname; | |
2346 | size_t nbytes; | |
2347 | struct trace_state_variable *tsv; | |
2348 | char *packet = own_buf; | |
2349 | ||
2350 | packet += strlen ("QTDV:"); | |
2351 | ||
2352 | packet = unpack_varlen_hex (packet, &num); | |
2353 | ++packet; /* skip a colon */ | |
2354 | packet = unpack_varlen_hex (packet, &val); | |
2355 | ++packet; /* skip a colon */ | |
2356 | packet = unpack_varlen_hex (packet, &builtin); | |
2357 | ++packet; /* skip a colon */ | |
2358 | ||
2359 | nbytes = strlen (packet) / 2; | |
2360 | varname = xmalloc (nbytes + 1); | |
2361 | nbytes = unhexify (varname, packet, nbytes); | |
2362 | varname[nbytes] = '\0'; | |
2363 | ||
fa593d66 | 2364 | tsv = create_trace_state_variable (num, 1); |
219f2f23 PA |
2365 | tsv->initial_value = (LONGEST) val; |
2366 | tsv->name = varname; | |
2367 | ||
2368 | set_trace_state_variable_value (num, (LONGEST) val); | |
2369 | ||
2370 | write_ok (own_buf); | |
2371 | } | |
2372 | ||
2373 | static void | |
2374 | cmd_qtv (char *own_buf) | |
2375 | { | |
2376 | ULONGEST num; | |
2377 | LONGEST val; | |
2378 | int err; | |
2379 | char *packet = own_buf; | |
2380 | ||
2381 | packet += strlen ("qTV:"); | |
2382 | packet = unpack_varlen_hex (packet, &num); | |
2383 | ||
2384 | if (current_traceframe >= 0) | |
2385 | { | |
2386 | err = traceframe_read_tsv ((int) num, &val); | |
2387 | if (err) | |
2388 | { | |
2389 | strcpy (own_buf, "U"); | |
2390 | return; | |
2391 | } | |
2392 | } | |
2393 | /* Only make tsv's be undefined before the first trace run. After a | |
2394 | trace run is over, the user might want to see the last value of | |
2395 | the tsv, and it might not be available in a traceframe. */ | |
2396 | else if (!tracing && strcmp (tracing_stop_reason, "tnotrun") == 0) | |
2397 | { | |
2398 | strcpy (own_buf, "U"); | |
2399 | return; | |
2400 | } | |
2401 | else | |
2402 | val = get_trace_state_variable_value (num); | |
2403 | ||
2404 | sprintf (own_buf, "V%s", phex_nz (val, 0)); | |
2405 | } | |
2406 | ||
2407 | /* Clear out the list of readonly regions. */ | |
2408 | ||
2409 | static void | |
2410 | clear_readonly_regions (void) | |
2411 | { | |
2412 | struct readonly_region *roreg; | |
2413 | ||
2414 | while (readonly_regions) | |
2415 | { | |
2416 | roreg = readonly_regions; | |
2417 | readonly_regions = readonly_regions->next; | |
2418 | free (roreg); | |
2419 | } | |
2420 | } | |
2421 | ||
2422 | /* Parse the collection of address ranges whose contents GDB believes | |
2423 | to be unchanging and so can be read directly from target memory | |
2424 | even while looking at a traceframe. */ | |
2425 | ||
2426 | static void | |
2427 | cmd_qtro (char *own_buf) | |
2428 | { | |
2429 | ULONGEST start, end; | |
2430 | struct readonly_region *roreg; | |
2431 | char *packet = own_buf; | |
2432 | ||
2433 | trace_debug ("Want to mark readonly regions"); | |
2434 | ||
2435 | clear_readonly_regions (); | |
2436 | ||
2437 | packet += strlen ("QTro"); | |
2438 | ||
2439 | while (*packet == ':') | |
2440 | { | |
2441 | ++packet; /* skip a colon */ | |
2442 | packet = unpack_varlen_hex (packet, &start); | |
2443 | ++packet; /* skip a comma */ | |
2444 | packet = unpack_varlen_hex (packet, &end); | |
2445 | roreg = xmalloc (sizeof (struct readonly_region)); | |
2446 | roreg->start = start; | |
2447 | roreg->end = end; | |
2448 | roreg->next = readonly_regions; | |
2449 | readonly_regions = roreg; | |
2450 | trace_debug ("Added readonly region from 0x%s to 0x%s", | |
2451 | paddress (roreg->start), paddress (roreg->end)); | |
2452 | } | |
2453 | ||
2454 | write_ok (own_buf); | |
2455 | } | |
2456 | ||
2457 | /* Test to see if the given range is in our list of readonly ranges. | |
2458 | We only test for being entirely within a range, GDB is not going to | |
2459 | send a single memory packet that spans multiple regions. */ | |
2460 | ||
2461 | int | |
2462 | in_readonly_region (CORE_ADDR addr, ULONGEST length) | |
2463 | { | |
2464 | struct readonly_region *roreg; | |
2465 | ||
2466 | for (roreg = readonly_regions; roreg; roreg = roreg->next) | |
2467 | if (roreg->start <= addr && (addr + length - 1) <= roreg->end) | |
2468 | return 1; | |
2469 | ||
2470 | return 0; | |
2471 | } | |
2472 | ||
fa593d66 PA |
2473 | /* The maximum size of a jump pad entry. */ |
2474 | static const int max_jump_pad_size = 0x100; | |
2475 | ||
2476 | static CORE_ADDR gdb_jump_pad_head; | |
2477 | ||
2478 | /* Return the address of the next free jump space. */ | |
2479 | ||
2480 | static CORE_ADDR | |
2481 | get_jump_space_head (void) | |
2482 | { | |
2483 | if (gdb_jump_pad_head == 0) | |
2484 | { | |
2485 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer, | |
2486 | &gdb_jump_pad_head)) | |
2487 | fatal ("error extracting jump_pad_buffer"); | |
2488 | } | |
2489 | ||
2490 | return gdb_jump_pad_head; | |
2491 | } | |
2492 | ||
2493 | /* Reserve USED bytes from the jump space. */ | |
2494 | ||
2495 | static void | |
2496 | claim_jump_space (ULONGEST used) | |
2497 | { | |
2498 | trace_debug ("claim_jump_space reserves %s bytes at %s", | |
2499 | pulongest (used), paddress (gdb_jump_pad_head)); | |
2500 | gdb_jump_pad_head += used; | |
2501 | } | |
2502 | ||
2503 | /* Sort tracepoints by PC, using a bubble sort. */ | |
2504 | ||
2505 | static void | |
2506 | sort_tracepoints (void) | |
2507 | { | |
2508 | struct tracepoint *lst, *tmp, *prev = NULL; | |
2509 | int i, j, n = 0; | |
2510 | ||
2511 | if (tracepoints == NULL) | |
2512 | return; | |
2513 | ||
2514 | /* Count nodes. */ | |
2515 | for (tmp = tracepoints; tmp->next; tmp = tmp->next) | |
2516 | n++; | |
2517 | ||
2518 | for (i = 0; i < n - 1; i++) | |
2519 | for (j = 0, lst = tracepoints; | |
2520 | lst && lst->next && (j <= n - 1 - i); | |
2521 | j++) | |
2522 | { | |
2523 | /* If we're at beginning, the start node is the prev | |
2524 | node. */ | |
2525 | if (j == 0) | |
2526 | prev = lst; | |
2527 | ||
2528 | /* Compare neighbors. */ | |
2529 | if (lst->next->address < lst->address) | |
2530 | { | |
2531 | struct tracepoint *p; | |
2532 | ||
2533 | /* Swap'em. */ | |
2534 | tmp = (lst->next ? lst->next->next : NULL); | |
2535 | ||
2536 | if (j == 0 && prev == tracepoints) | |
2537 | tracepoints = lst->next; | |
2538 | ||
2539 | p = lst->next; | |
2540 | prev->next = lst->next; | |
2541 | lst->next->next = lst; | |
2542 | lst->next = tmp; | |
2543 | prev = p; | |
2544 | } | |
2545 | else | |
2546 | { | |
2547 | lst = lst->next; | |
2548 | /* Keep track of the previous node. We need it if we need | |
2549 | to swap nodes. */ | |
2550 | if (j != 0) | |
2551 | prev = prev->next; | |
2552 | } | |
2553 | } | |
2554 | } | |
2555 | ||
2556 | #define MAX_JUMP_SIZE 20 | |
2557 | ||
219f2f23 PA |
2558 | static void |
2559 | cmd_qtstart (char *packet) | |
2560 | { | |
fa593d66 PA |
2561 | struct tracepoint *tpoint, *prev_ftpoint; |
2562 | int slow_tracepoint_count, fast_count; | |
2563 | CORE_ADDR jump_entry; | |
2564 | ||
2565 | /* The jump to the jump pad of the last fast tracepoint | |
2566 | installed. */ | |
2567 | unsigned char fjump[MAX_JUMP_SIZE]; | |
2568 | ULONGEST fjump_size; | |
219f2f23 PA |
2569 | |
2570 | trace_debug ("Starting the trace"); | |
2571 | ||
fa593d66 | 2572 | slow_tracepoint_count = fast_count = 0; |
219f2f23 | 2573 | |
fa593d66 PA |
2574 | /* Sort tracepoints by ascending address. This makes installing |
2575 | fast tracepoints at the same address easier to handle. */ | |
2576 | sort_tracepoints (); | |
219f2f23 | 2577 | |
7984d532 | 2578 | /* Pause all threads temporarily while we patch tracepoints. */ |
fa593d66 PA |
2579 | pause_all (0); |
2580 | ||
2581 | /* Get threads out of jump pads. Safe to do here, since this is a | |
2582 | top level command. And, required to do here, since we're | |
2583 | deleting/rewriting jump pads. */ | |
2584 | ||
2585 | stabilize_threads (); | |
2586 | ||
2587 | /* Freeze threads. */ | |
7984d532 PA |
2588 | pause_all (1); |
2589 | ||
fa593d66 PA |
2590 | /* Sync the fast tracepoints list in the inferior ftlib. */ |
2591 | if (in_process_agent_loaded ()) | |
2592 | { | |
2593 | download_tracepoints (); | |
2594 | download_trace_state_variables (); | |
2595 | } | |
2596 | ||
2597 | /* No previous fast tpoint yet. */ | |
2598 | prev_ftpoint = NULL; | |
2599 | ||
2600 | *packet = '\0'; | |
2601 | ||
219f2f23 PA |
2602 | /* Install tracepoints. */ |
2603 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
2604 | { | |
2605 | /* Ensure all the hit counts start at zero. */ | |
2606 | tpoint->hit_count = 0; | |
2607 | ||
2608 | if (!tpoint->enabled) | |
2609 | continue; | |
2610 | ||
fa593d66 PA |
2611 | if (tpoint->type == trap_tracepoint) |
2612 | { | |
2613 | ++slow_tracepoint_count; | |
2614 | ||
2615 | /* Tracepoints are installed as memory breakpoints. Just go | |
2616 | ahead and install the trap. The breakpoints module | |
2617 | handles duplicated breakpoints, and the memory read | |
2618 | routine handles un-patching traps from memory reads. */ | |
2619 | tpoint->handle = set_breakpoint_at (tpoint->address, | |
2620 | tracepoint_handler); | |
2621 | } | |
2622 | else if (tpoint->type == fast_tracepoint) | |
2623 | { | |
2624 | ++fast_count; | |
2625 | ||
2626 | if (maybe_write_ipa_not_loaded (packet)) | |
2627 | { | |
2628 | trace_debug ("Requested a fast tracepoint, but fast " | |
2629 | "tracepoints aren't supported."); | |
2630 | break; | |
2631 | } | |
2632 | ||
2633 | if (prev_ftpoint != NULL && prev_ftpoint->address == tpoint->address) | |
2634 | { | |
2635 | tpoint->handle = set_fast_tracepoint_jump (tpoint->address, | |
2636 | fjump, | |
2637 | fjump_size); | |
2638 | tpoint->jump_pad = prev_ftpoint->jump_pad; | |
2639 | tpoint->jump_pad_end = prev_ftpoint->jump_pad_end; | |
2640 | tpoint->adjusted_insn_addr = prev_ftpoint->adjusted_insn_addr; | |
2641 | tpoint->adjusted_insn_addr_end | |
2642 | = prev_ftpoint->adjusted_insn_addr_end; | |
2643 | } | |
2644 | else | |
2645 | { | |
2646 | CORE_ADDR jentry; | |
2647 | int err = 0; | |
2648 | ||
2649 | prev_ftpoint = NULL; | |
2650 | ||
2651 | jentry = jump_entry = get_jump_space_head (); | |
2652 | ||
2653 | /* Install the jump pad. */ | |
2654 | err = install_fast_tracepoint_jump_pad | |
2655 | (tpoint->obj_addr_on_target, | |
2656 | tpoint->address, | |
2657 | ipa_sym_addrs.addr_gdb_collect, | |
2658 | ipa_sym_addrs.addr_collecting, | |
2659 | tpoint->orig_size, | |
2660 | &jentry, | |
2661 | fjump, &fjump_size, | |
2662 | &tpoint->adjusted_insn_addr, | |
2663 | &tpoint->adjusted_insn_addr_end); | |
2664 | ||
2665 | /* Wire it in. */ | |
2666 | if (!err) | |
2667 | tpoint->handle = set_fast_tracepoint_jump (tpoint->address, | |
2668 | fjump, fjump_size); | |
2669 | ||
2670 | if (tpoint->handle != NULL) | |
2671 | { | |
2672 | tpoint->jump_pad = jump_entry; | |
2673 | tpoint->jump_pad_end = jentry; | |
219f2f23 | 2674 | |
fa593d66 PA |
2675 | /* Pad to 8-byte alignment. */ |
2676 | jentry = ((jentry + 7) & ~0x7); | |
2677 | claim_jump_space (jentry - jump_entry); | |
219f2f23 | 2678 | |
fa593d66 PA |
2679 | /* So that we can handle multiple fast tracepoints |
2680 | at the same address easily. */ | |
2681 | prev_ftpoint = tpoint; | |
2682 | } | |
2683 | } | |
2684 | } | |
2685 | ||
2686 | /* Any failure in the inner loop is sufficient cause to give | |
2687 | up. */ | |
219f2f23 PA |
2688 | if (tpoint->handle == NULL) |
2689 | break; | |
2690 | } | |
2691 | ||
2692 | /* Any error in tracepoint insertion is unacceptable; better to | |
2693 | address the problem now, than end up with a useless or misleading | |
2694 | trace run. */ | |
2695 | if (tpoint != NULL) | |
2696 | { | |
2697 | clear_installed_tracepoints (); | |
2698 | if (*packet == '\0') | |
2699 | write_enn (packet); | |
7984d532 | 2700 | unpause_all (1); |
219f2f23 PA |
2701 | return; |
2702 | } | |
2703 | ||
2704 | stopping_tracepoint = NULL; | |
2705 | trace_buffer_is_full = 0; | |
2706 | expr_eval_result = expr_eval_no_error; | |
2707 | error_tracepoint = NULL; | |
2708 | ||
2709 | /* Tracing is now active, hits will now start being logged. */ | |
2710 | tracing = 1; | |
2711 | ||
fa593d66 PA |
2712 | if (in_process_agent_loaded ()) |
2713 | { | |
2714 | if (write_inferior_integer (ipa_sym_addrs.addr_tracing, 1)) | |
2715 | fatal ("Error setting tracing variable in lib"); | |
2716 | ||
2717 | if (write_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, | |
2718 | 0)) | |
2719 | fatal ("Error clearing stopping_tracepoint variable in lib"); | |
2720 | ||
2721 | if (write_inferior_integer (ipa_sym_addrs.addr_trace_buffer_is_full, 0)) | |
2722 | fatal ("Error clearing trace_buffer_is_full variable in lib"); | |
2723 | ||
2724 | stop_tracing_bkpt = set_breakpoint_at (ipa_sym_addrs.addr_stop_tracing, | |
2725 | stop_tracing_handler); | |
2726 | if (stop_tracing_bkpt == NULL) | |
2727 | error ("Error setting stop_tracing breakpoint"); | |
2728 | ||
2729 | flush_trace_buffer_bkpt | |
2730 | = set_breakpoint_at (ipa_sym_addrs.addr_flush_trace_buffer, | |
2731 | flush_trace_buffer_handler); | |
2732 | if (flush_trace_buffer_bkpt == NULL) | |
2733 | error ("Error setting flush_trace_buffer breakpoint"); | |
2734 | } | |
2735 | ||
7984d532 PA |
2736 | unpause_all (1); |
2737 | ||
219f2f23 PA |
2738 | write_ok (packet); |
2739 | } | |
2740 | ||
2741 | /* End a tracing run, filling in a stop reason to report back to GDB, | |
2742 | and removing the tracepoints from the code. */ | |
2743 | ||
8336d594 | 2744 | void |
219f2f23 PA |
2745 | stop_tracing (void) |
2746 | { | |
2747 | if (!tracing) | |
2748 | { | |
2749 | trace_debug ("Tracing is already off, ignoring"); | |
2750 | return; | |
2751 | } | |
2752 | ||
2753 | trace_debug ("Stopping the trace"); | |
2754 | ||
fa593d66 PA |
2755 | /* Pause all threads before removing fast jumps from memory, |
2756 | breakpoints, and touching IPA state variables (inferior memory). | |
2757 | Some thread may hit the internal tracing breakpoints, or be | |
2758 | collecting this moment, but that's ok, we don't release the | |
2759 | tpoint object's memory or the jump pads here (we only do that | |
2760 | when we're sure we can move all threads out of the jump pads). | |
2761 | We can't now, since we may be getting here due to the inferior | |
2762 | agent calling us. */ | |
7984d532 PA |
2763 | pause_all (1); |
2764 | /* Since we're removing breakpoints, cancel breakpoint hits, | |
2765 | possibly related to the breakpoints we're about to delete. */ | |
2766 | cancel_breakpoints (); | |
2767 | ||
219f2f23 PA |
2768 | /* Stop logging. Tracepoints can still be hit, but they will not be |
2769 | recorded. */ | |
2770 | tracing = 0; | |
fa593d66 PA |
2771 | if (in_process_agent_loaded ()) |
2772 | { | |
2773 | if (write_inferior_integer (ipa_sym_addrs.addr_tracing, 0)) | |
2774 | fatal ("Error clearing tracing variable in lib"); | |
2775 | } | |
219f2f23 PA |
2776 | |
2777 | tracing_stop_reason = "t???"; | |
2778 | tracing_stop_tpnum = 0; | |
2779 | if (stopping_tracepoint) | |
2780 | { | |
2781 | trace_debug ("Stopping the trace because " | |
2782 | "tracepoint %d was hit %ld times", | |
2783 | stopping_tracepoint->number, | |
2784 | stopping_tracepoint->pass_count); | |
2785 | tracing_stop_reason = "tpasscount"; | |
2786 | tracing_stop_tpnum = stopping_tracepoint->number; | |
2787 | } | |
2788 | else if (trace_buffer_is_full) | |
2789 | { | |
2790 | trace_debug ("Stopping the trace because the trace buffer is full"); | |
2791 | tracing_stop_reason = "tfull"; | |
2792 | } | |
2793 | else if (expr_eval_result != expr_eval_no_error) | |
2794 | { | |
2795 | trace_debug ("Stopping the trace because of an expression eval error"); | |
2796 | tracing_stop_reason = eval_result_names[expr_eval_result]; | |
2797 | tracing_stop_tpnum = error_tracepoint->number; | |
2798 | } | |
fa593d66 | 2799 | #ifndef IN_PROCESS_AGENT |
8336d594 PA |
2800 | else if (!gdb_connected ()) |
2801 | { | |
2802 | trace_debug ("Stopping the trace because GDB disconnected"); | |
2803 | tracing_stop_reason = "tdisconnected"; | |
2804 | } | |
fa593d66 | 2805 | #endif |
219f2f23 PA |
2806 | else |
2807 | { | |
2808 | trace_debug ("Stopping the trace because of a tstop command"); | |
2809 | tracing_stop_reason = "tstop"; | |
2810 | } | |
2811 | ||
2812 | stopping_tracepoint = NULL; | |
2813 | error_tracepoint = NULL; | |
2814 | ||
2815 | /* Clear out the tracepoints. */ | |
2816 | clear_installed_tracepoints (); | |
7984d532 | 2817 | |
fa593d66 PA |
2818 | if (in_process_agent_loaded ()) |
2819 | { | |
2820 | /* Pull in fast tracepoint trace frames from the inferior lib | |
2821 | buffer into our buffer, even if our buffer is already full, | |
2822 | because we want to present the full number of created frames | |
2823 | in addition to what fit in the trace buffer. */ | |
2824 | upload_fast_traceframes (); | |
2825 | } | |
2826 | ||
2827 | if (stop_tracing_bkpt != NULL) | |
2828 | { | |
2829 | delete_breakpoint (stop_tracing_bkpt); | |
2830 | stop_tracing_bkpt = NULL; | |
2831 | } | |
2832 | ||
2833 | if (flush_trace_buffer_bkpt != NULL) | |
2834 | { | |
2835 | delete_breakpoint (flush_trace_buffer_bkpt); | |
2836 | flush_trace_buffer_bkpt = NULL; | |
2837 | } | |
2838 | ||
7984d532 | 2839 | unpause_all (1); |
219f2f23 PA |
2840 | } |
2841 | ||
fa593d66 PA |
2842 | static int |
2843 | stop_tracing_handler (CORE_ADDR addr) | |
2844 | { | |
2845 | trace_debug ("lib hit stop_tracing"); | |
2846 | ||
2847 | /* Don't actually handle it here. When we stop tracing we remove | |
2848 | breakpoints from the inferior, and that is not allowed in a | |
2849 | breakpoint handler (as the caller is walking the breakpoint | |
2850 | list). */ | |
2851 | return 0; | |
2852 | } | |
2853 | ||
2854 | static int | |
2855 | flush_trace_buffer_handler (CORE_ADDR addr) | |
2856 | { | |
2857 | trace_debug ("lib hit flush_trace_buffer"); | |
2858 | return 0; | |
2859 | } | |
2860 | ||
219f2f23 PA |
2861 | static void |
2862 | cmd_qtstop (char *packet) | |
2863 | { | |
2864 | stop_tracing (); | |
2865 | write_ok (packet); | |
2866 | } | |
2867 | ||
8336d594 PA |
2868 | static void |
2869 | cmd_qtdisconnected (char *own_buf) | |
2870 | { | |
2871 | ULONGEST setting; | |
2872 | char *packet = own_buf; | |
2873 | ||
2874 | packet += strlen ("QTDisconnected:"); | |
2875 | ||
2876 | unpack_varlen_hex (packet, &setting); | |
2877 | ||
2878 | write_ok (own_buf); | |
2879 | ||
2880 | disconnected_tracing = setting; | |
2881 | } | |
2882 | ||
219f2f23 PA |
2883 | static void |
2884 | cmd_qtframe (char *own_buf) | |
2885 | { | |
2886 | ULONGEST frame, pc, lo, hi, num; | |
2887 | int tfnum, tpnum; | |
2888 | struct traceframe *tframe; | |
2889 | char *packet = own_buf; | |
2890 | ||
2891 | packet += strlen ("QTFrame:"); | |
2892 | ||
2893 | if (strncmp (packet, "pc:", strlen ("pc:")) == 0) | |
2894 | { | |
2895 | packet += strlen ("pc:"); | |
2896 | packet = unpack_varlen_hex (packet, &pc); | |
2897 | trace_debug ("Want to find next traceframe at pc=0x%s", paddress (pc)); | |
2898 | tframe = find_next_traceframe_in_range (pc, pc, 1, &tfnum); | |
2899 | } | |
2900 | else if (strncmp (packet, "range:", strlen ("range:")) == 0) | |
2901 | { | |
2902 | packet += strlen ("range:"); | |
2903 | packet = unpack_varlen_hex (packet, &lo); | |
2904 | ++packet; | |
2905 | packet = unpack_varlen_hex (packet, &hi); | |
2906 | trace_debug ("Want to find next traceframe in the range 0x%s to 0x%s", | |
2907 | paddress (lo), paddress (hi)); | |
2908 | tframe = find_next_traceframe_in_range (lo, hi, 1, &tfnum); | |
2909 | } | |
2910 | else if (strncmp (packet, "outside:", strlen ("outside:")) == 0) | |
2911 | { | |
2912 | packet += strlen ("outside:"); | |
2913 | packet = unpack_varlen_hex (packet, &lo); | |
2914 | ++packet; | |
2915 | packet = unpack_varlen_hex (packet, &hi); | |
2916 | trace_debug ("Want to find next traceframe " | |
2917 | "outside the range 0x%s to 0x%s", | |
2918 | paddress (lo), paddress (hi)); | |
2919 | tframe = find_next_traceframe_in_range (lo, hi, 0, &tfnum); | |
2920 | } | |
2921 | else if (strncmp (packet, "tdp:", strlen ("tdp:")) == 0) | |
2922 | { | |
2923 | packet += strlen ("tdp:"); | |
2924 | packet = unpack_varlen_hex (packet, &num); | |
2925 | tpnum = (int) num; | |
2926 | trace_debug ("Want to find next traceframe for tracepoint %d", tpnum); | |
2927 | tframe = find_next_traceframe_by_tracepoint (tpnum, &tfnum); | |
2928 | } | |
2929 | else | |
2930 | { | |
2931 | unpack_varlen_hex (packet, &frame); | |
2932 | tfnum = (int) frame; | |
2933 | if (tfnum == -1) | |
2934 | { | |
2935 | trace_debug ("Want to stop looking at traceframes"); | |
2936 | current_traceframe = -1; | |
2937 | write_ok (own_buf); | |
2938 | return; | |
2939 | } | |
2940 | trace_debug ("Want to look at traceframe %d", tfnum); | |
2941 | tframe = find_traceframe (tfnum); | |
2942 | } | |
2943 | ||
2944 | if (tframe) | |
2945 | { | |
2946 | current_traceframe = tfnum; | |
2947 | sprintf (own_buf, "F%xT%x", tfnum, tframe->tpnum); | |
2948 | } | |
2949 | else | |
2950 | sprintf (own_buf, "F-1"); | |
2951 | } | |
2952 | ||
2953 | static void | |
2954 | cmd_qtstatus (char *packet) | |
2955 | { | |
2956 | char *stop_reason_rsp = NULL; | |
2957 | ||
2958 | trace_debug ("Returning trace status as %d, stop reason %s", | |
2959 | tracing, tracing_stop_reason); | |
2960 | ||
fa593d66 PA |
2961 | if (in_process_agent_loaded ()) |
2962 | { | |
2963 | pause_all (1); | |
2964 | ||
2965 | upload_fast_traceframes (); | |
2966 | ||
2967 | unpause_all (1); | |
2968 | } | |
2969 | ||
219f2f23 PA |
2970 | stop_reason_rsp = (char *) tracing_stop_reason; |
2971 | ||
2972 | /* The user visible error string in terror needs to be hex encoded. | |
2973 | We leave it as plain string in `tracepoint_stop_reason' to ease | |
2974 | debugging. */ | |
2975 | if (strncmp (stop_reason_rsp, "terror:", strlen ("terror:")) == 0) | |
2976 | { | |
2977 | const char *result_name; | |
2978 | int hexstr_len; | |
2979 | char *p; | |
2980 | ||
2981 | result_name = stop_reason_rsp + strlen ("terror:"); | |
2982 | hexstr_len = strlen (result_name) * 2; | |
2983 | p = stop_reason_rsp = alloca (strlen ("terror:") + hexstr_len + 1); | |
2984 | strcpy (p, "terror:"); | |
2985 | p += strlen (p); | |
2986 | convert_int_to_ascii ((gdb_byte *) result_name, p, strlen (result_name)); | |
2987 | } | |
2988 | ||
8336d594 PA |
2989 | sprintf (packet, |
2990 | "T%d;" | |
2991 | "%s:%x;" | |
2992 | "tframes:%x;tcreated:%x;" | |
2993 | "tfree:%x;tsize:%s;" | |
2994 | "circular:%d;" | |
2995 | "disconn:%d", | |
623ccd72 | 2996 | tracing ? 1 : 0, |
219f2f23 PA |
2997 | stop_reason_rsp, tracing_stop_tpnum, |
2998 | traceframe_count, traceframes_created, | |
8336d594 PA |
2999 | free_space (), phex_nz (trace_buffer_hi - trace_buffer_lo, 0), |
3000 | circular_trace_buffer, | |
3001 | disconnected_tracing); | |
219f2f23 PA |
3002 | } |
3003 | ||
3004 | /* State variables to help return all the tracepoint bits. */ | |
3005 | static struct tracepoint *cur_tpoint; | |
3006 | static int cur_action; | |
3007 | static int cur_step_action; | |
3008 | static struct source_string *cur_source_string; | |
3009 | static struct trace_state_variable *cur_tsv; | |
3010 | ||
3011 | /* Compose a response that is an imitation of the syntax by which the | |
3012 | tracepoint was originally downloaded. */ | |
3013 | ||
3014 | static void | |
3015 | response_tracepoint (char *packet, struct tracepoint *tpoint) | |
3016 | { | |
3017 | char *buf; | |
3018 | ||
3019 | sprintf (packet, "T%x:%s:%c:%lx:%lx", tpoint->number, | |
3020 | paddress (tpoint->address), | |
3021 | (tpoint->enabled ? 'E' : 'D'), tpoint->step_count, | |
3022 | tpoint->pass_count); | |
fa593d66 PA |
3023 | if (tpoint->type == fast_tracepoint) |
3024 | sprintf (packet + strlen (packet), ":F%x", tpoint->orig_size); | |
219f2f23 PA |
3025 | |
3026 | if (tpoint->cond) | |
3027 | { | |
3028 | buf = unparse_agent_expr (tpoint->cond); | |
3029 | sprintf (packet + strlen (packet), ":X%x,%s", | |
3030 | tpoint->cond->length, buf); | |
3031 | free (buf); | |
3032 | } | |
3033 | } | |
3034 | ||
3035 | /* Compose a response that is an imitation of the syntax by which the | |
3036 | tracepoint action was originally downloaded (with the difference | |
3037 | that due to the way we store the actions, this will output a packet | |
3038 | per action, while GDB could have combined more than one action | |
3039 | per-packet. */ | |
3040 | ||
3041 | static void | |
3042 | response_action (char *packet, struct tracepoint *tpoint, | |
3043 | char *taction, int step) | |
3044 | { | |
3045 | sprintf (packet, "%c%x:%s:%s", | |
3046 | (step ? 'S' : 'A'), tpoint->number, paddress (tpoint->address), | |
3047 | taction); | |
3048 | } | |
3049 | ||
3050 | /* Compose a response that is an imitation of the syntax by which the | |
3051 | tracepoint source piece was originally downloaded. */ | |
3052 | ||
3053 | static void | |
3054 | response_source (char *packet, | |
3055 | struct tracepoint *tpoint, struct source_string *src) | |
3056 | { | |
3057 | char *buf; | |
3058 | int len; | |
3059 | ||
3060 | len = strlen (src->str); | |
3061 | buf = alloca (len * 2 + 1); | |
3062 | convert_int_to_ascii ((gdb_byte *) src->str, buf, len); | |
3063 | ||
3064 | sprintf (packet, "Z%x:%s:%s:%x:%x:%s", | |
3065 | tpoint->number, paddress (tpoint->address), | |
3066 | src->type, 0, len, buf); | |
3067 | } | |
3068 | ||
3069 | /* Return the first piece of tracepoint definition, and initialize the | |
3070 | state machine that will iterate through all the tracepoint | |
3071 | bits. */ | |
3072 | ||
3073 | static void | |
3074 | cmd_qtfp (char *packet) | |
3075 | { | |
3076 | trace_debug ("Returning first tracepoint definition piece"); | |
3077 | ||
3078 | cur_tpoint = tracepoints; | |
3079 | cur_action = cur_step_action = -1; | |
3080 | cur_source_string = NULL; | |
3081 | ||
3082 | if (cur_tpoint) | |
3083 | response_tracepoint (packet, cur_tpoint); | |
3084 | else | |
3085 | strcpy (packet, "l"); | |
3086 | } | |
3087 | ||
3088 | /* Return additional pieces of tracepoint definition. Each action and | |
3089 | stepping action must go into its own packet, because of packet size | |
3090 | limits, and so we use state variables to deliver one piece at a | |
3091 | time. */ | |
3092 | ||
3093 | static void | |
3094 | cmd_qtsp (char *packet) | |
3095 | { | |
3096 | trace_debug ("Returning subsequent tracepoint definition piece"); | |
3097 | ||
3098 | if (!cur_tpoint) | |
3099 | { | |
3100 | /* This case would normally never occur, but be prepared for | |
3101 | GDB misbehavior. */ | |
3102 | strcpy (packet, "l"); | |
3103 | } | |
3104 | else if (cur_action < cur_tpoint->numactions - 1) | |
3105 | { | |
3106 | ++cur_action; | |
3107 | response_action (packet, cur_tpoint, | |
3108 | cur_tpoint->actions_str[cur_action], 0); | |
3109 | } | |
3110 | else if (cur_step_action < cur_tpoint->num_step_actions - 1) | |
3111 | { | |
3112 | ++cur_step_action; | |
3113 | response_action (packet, cur_tpoint, | |
3114 | cur_tpoint->step_actions_str[cur_step_action], 1); | |
3115 | } | |
3116 | else if ((cur_source_string | |
3117 | ? cur_source_string->next | |
3118 | : cur_tpoint->source_strings)) | |
3119 | { | |
3120 | if (cur_source_string) | |
3121 | cur_source_string = cur_source_string->next; | |
3122 | else | |
3123 | cur_source_string = cur_tpoint->source_strings; | |
3124 | response_source (packet, cur_tpoint, cur_source_string); | |
3125 | } | |
3126 | else | |
3127 | { | |
3128 | cur_tpoint = cur_tpoint->next; | |
3129 | cur_action = cur_step_action = -1; | |
3130 | cur_source_string = NULL; | |
3131 | if (cur_tpoint) | |
3132 | response_tracepoint (packet, cur_tpoint); | |
3133 | else | |
3134 | strcpy (packet, "l"); | |
3135 | } | |
3136 | } | |
3137 | ||
3138 | /* Compose a response that is an imitation of the syntax by which the | |
3139 | trace state variable was originally downloaded. */ | |
3140 | ||
3141 | static void | |
3142 | response_tsv (char *packet, struct trace_state_variable *tsv) | |
3143 | { | |
3144 | char *buf = (char *) ""; | |
3145 | int namelen; | |
3146 | ||
3147 | if (tsv->name) | |
3148 | { | |
3149 | namelen = strlen (tsv->name); | |
3150 | buf = alloca (namelen * 2 + 1); | |
3151 | convert_int_to_ascii ((gdb_byte *) tsv->name, buf, namelen); | |
3152 | } | |
3153 | ||
3154 | sprintf (packet, "%x:%s:%x:%s", tsv->number, phex_nz (tsv->initial_value, 0), | |
3155 | tsv->getter ? 1 : 0, buf); | |
3156 | } | |
3157 | ||
3158 | /* Return the first trace state variable definition, and initialize | |
3159 | the state machine that will iterate through all the tsv bits. */ | |
3160 | ||
3161 | static void | |
3162 | cmd_qtfv (char *packet) | |
3163 | { | |
3164 | trace_debug ("Returning first trace state variable definition"); | |
3165 | ||
3166 | cur_tsv = trace_state_variables; | |
3167 | ||
3168 | if (cur_tsv) | |
3169 | response_tsv (packet, cur_tsv); | |
3170 | else | |
3171 | strcpy (packet, "l"); | |
3172 | } | |
3173 | ||
3174 | /* Return additional trace state variable definitions. */ | |
3175 | ||
3176 | static void | |
3177 | cmd_qtsv (char *packet) | |
3178 | { | |
3179 | trace_debug ("Returning first trace state variable definition"); | |
3180 | ||
3181 | if (!cur_tpoint) | |
3182 | { | |
3183 | /* This case would normally never occur, but be prepared for | |
3184 | GDB misbehavior. */ | |
3185 | strcpy (packet, "l"); | |
3186 | } | |
3187 | else if (cur_tsv) | |
3188 | { | |
3189 | cur_tsv = cur_tsv->next; | |
3190 | if (cur_tsv) | |
3191 | response_tsv (packet, cur_tsv); | |
3192 | else | |
3193 | strcpy (packet, "l"); | |
3194 | } | |
3195 | else | |
3196 | strcpy (packet, "l"); | |
3197 | } | |
3198 | ||
3199 | /* Respond to qTBuffer packet with a block of raw data from the trace | |
3200 | buffer. GDB may ask for a lot, but we are allowed to reply with | |
3201 | only as much as will fit within packet limits or whatever. */ | |
3202 | ||
3203 | static void | |
3204 | cmd_qtbuffer (char *own_buf) | |
3205 | { | |
3206 | ULONGEST offset, num, tot; | |
3207 | unsigned char *tbp; | |
3208 | char *packet = own_buf; | |
3209 | ||
3210 | packet += strlen ("qTBuffer:"); | |
3211 | ||
3212 | packet = unpack_varlen_hex (packet, &offset); | |
3213 | ++packet; /* skip a comma */ | |
3214 | packet = unpack_varlen_hex (packet, &num); | |
3215 | ||
3216 | trace_debug ("Want to get trace buffer, %d bytes at offset 0x%s", | |
3217 | (int) num, pulongest (offset)); | |
3218 | ||
3219 | tot = (trace_buffer_hi - trace_buffer_lo) - free_space (); | |
3220 | ||
3221 | /* If we're right at the end, reply specially that we're done. */ | |
3222 | if (offset == tot) | |
3223 | { | |
3224 | strcpy (own_buf, "l"); | |
3225 | return; | |
3226 | } | |
3227 | ||
3228 | /* Object to any other out-of-bounds request. */ | |
3229 | if (offset > tot) | |
3230 | { | |
3231 | write_enn (own_buf); | |
3232 | return; | |
3233 | } | |
3234 | ||
3235 | /* Compute the pointer corresponding to the given offset, accounting | |
3236 | for wraparound. */ | |
3237 | tbp = trace_buffer_start + offset; | |
3238 | if (tbp >= trace_buffer_wrap) | |
3239 | tbp -= (trace_buffer_wrap - trace_buffer_lo); | |
3240 | ||
3241 | /* Trim to the remaining bytes if we're close to the end. */ | |
3242 | if (num > tot - offset) | |
3243 | num = tot - offset; | |
3244 | ||
3245 | /* Trim to available packet size. */ | |
3246 | if (num >= (PBUFSIZ - 16) / 2 ) | |
3247 | num = (PBUFSIZ - 16) / 2; | |
3248 | ||
3249 | convert_int_to_ascii (tbp, own_buf, num); | |
3250 | own_buf[num] = '\0'; | |
3251 | } | |
3252 | ||
3253 | static void | |
3254 | cmd_bigqtbuffer (char *own_buf) | |
3255 | { | |
3256 | ULONGEST val; | |
3257 | char *packet = own_buf; | |
3258 | ||
3259 | packet += strlen ("QTBuffer:"); | |
3260 | ||
3261 | if (strncmp ("circular:", packet, strlen ("circular:")) == 0) | |
3262 | { | |
3263 | packet += strlen ("circular:"); | |
3264 | packet = unpack_varlen_hex (packet, &val); | |
3265 | circular_trace_buffer = val; | |
3266 | trace_debug ("Trace buffer is now %s", | |
3267 | circular_trace_buffer ? "circular" : "linear"); | |
3268 | write_ok (own_buf); | |
3269 | } | |
3270 | else | |
3271 | write_enn (own_buf); | |
3272 | } | |
3273 | ||
3274 | int | |
3275 | handle_tracepoint_general_set (char *packet) | |
3276 | { | |
3277 | if (strcmp ("QTinit", packet) == 0) | |
3278 | { | |
3279 | cmd_qtinit (packet); | |
3280 | return 1; | |
3281 | } | |
3282 | else if (strncmp ("QTDP:", packet, strlen ("QTDP:")) == 0) | |
3283 | { | |
3284 | cmd_qtdp (packet); | |
3285 | return 1; | |
3286 | } | |
3287 | else if (strncmp ("QTDPsrc:", packet, strlen ("QTDPsrc:")) == 0) | |
3288 | { | |
3289 | cmd_qtdpsrc (packet); | |
3290 | return 1; | |
3291 | } | |
3292 | else if (strncmp ("QTDV:", packet, strlen ("QTDV:")) == 0) | |
3293 | { | |
3294 | cmd_qtdv (packet); | |
3295 | return 1; | |
3296 | } | |
3297 | else if (strncmp ("QTro:", packet, strlen ("QTro:")) == 0) | |
3298 | { | |
3299 | cmd_qtro (packet); | |
3300 | return 1; | |
3301 | } | |
3302 | else if (strcmp ("QTStart", packet) == 0) | |
3303 | { | |
3304 | cmd_qtstart (packet); | |
3305 | return 1; | |
3306 | } | |
3307 | else if (strcmp ("QTStop", packet) == 0) | |
3308 | { | |
3309 | cmd_qtstop (packet); | |
3310 | return 1; | |
3311 | } | |
8336d594 PA |
3312 | else if (strncmp ("QTDisconnected:", packet, |
3313 | strlen ("QTDisconnected:")) == 0) | |
3314 | { | |
3315 | cmd_qtdisconnected (packet); | |
3316 | return 1; | |
3317 | } | |
219f2f23 PA |
3318 | else if (strncmp ("QTFrame:", packet, strlen ("QTFrame:")) == 0) |
3319 | { | |
3320 | cmd_qtframe (packet); | |
3321 | return 1; | |
3322 | } | |
3323 | else if (strncmp ("QTBuffer:", packet, strlen ("QTBuffer:")) == 0) | |
3324 | { | |
3325 | cmd_bigqtbuffer (packet); | |
3326 | return 1; | |
3327 | } | |
3328 | ||
3329 | return 0; | |
3330 | } | |
3331 | ||
3332 | int | |
3333 | handle_tracepoint_query (char *packet) | |
3334 | { | |
3335 | if (strcmp ("qTStatus", packet) == 0) | |
3336 | { | |
3337 | cmd_qtstatus (packet); | |
3338 | return 1; | |
3339 | } | |
3340 | else if (strcmp ("qTfP", packet) == 0) | |
3341 | { | |
3342 | cmd_qtfp (packet); | |
3343 | return 1; | |
3344 | } | |
3345 | else if (strcmp ("qTsP", packet) == 0) | |
3346 | { | |
3347 | cmd_qtsp (packet); | |
3348 | return 1; | |
3349 | } | |
3350 | else if (strcmp ("qTfV", packet) == 0) | |
3351 | { | |
3352 | cmd_qtfv (packet); | |
3353 | return 1; | |
3354 | } | |
3355 | else if (strcmp ("qTsV", packet) == 0) | |
3356 | { | |
3357 | cmd_qtsv (packet); | |
3358 | return 1; | |
3359 | } | |
3360 | else if (strncmp ("qTV:", packet, strlen ("qTV:")) == 0) | |
3361 | { | |
3362 | cmd_qtv (packet); | |
3363 | return 1; | |
3364 | } | |
3365 | else if (strncmp ("qTBuffer:", packet, strlen ("qTBuffer:")) == 0) | |
3366 | { | |
3367 | cmd_qtbuffer (packet); | |
3368 | return 1; | |
3369 | } | |
3370 | ||
3371 | return 0; | |
3372 | } | |
3373 | ||
fa593d66 PA |
3374 | #endif |
3375 | #ifndef IN_PROCESS_AGENT | |
3376 | ||
219f2f23 PA |
3377 | /* Call this when thread TINFO has hit the tracepoint defined by |
3378 | TP_NUMBER and TP_ADDRESS, and that tracepoint has a while-stepping | |
3379 | action. This adds a while-stepping collecting state item to the | |
3380 | threads' collecting state list, so that we can keep track of | |
3381 | multiple simultaneous while-stepping actions being collected by the | |
3382 | same thread. This can happen in cases like: | |
3383 | ||
3384 | ff0001 INSN1 <-- TP1, while-stepping 10 collect $regs | |
3385 | ff0002 INSN2 | |
3386 | ff0003 INSN3 <-- TP2, collect $regs | |
3387 | ff0004 INSN4 <-- TP3, while-stepping 10 collect $regs | |
3388 | ff0005 INSN5 | |
3389 | ||
3390 | Notice that when instruction INSN5 is reached, the while-stepping | |
3391 | actions of both TP1 and TP3 are still being collected, and that TP2 | |
3392 | had been collected meanwhile. The whole range of ff0001-ff0005 | |
3393 | should be single-stepped, due to at least TP1's while-stepping | |
3394 | action covering the whole range. */ | |
3395 | ||
3396 | static void | |
3397 | add_while_stepping_state (struct thread_info *tinfo, | |
3398 | int tp_number, CORE_ADDR tp_address) | |
3399 | { | |
3400 | struct wstep_state *wstep; | |
3401 | ||
3402 | wstep = xmalloc (sizeof (*wstep)); | |
3403 | wstep->next = tinfo->while_stepping; | |
3404 | ||
3405 | wstep->tp_number = tp_number; | |
3406 | wstep->tp_address = tp_address; | |
3407 | wstep->current_step = 0; | |
3408 | ||
3409 | tinfo->while_stepping = wstep; | |
3410 | } | |
3411 | ||
3412 | /* Release the while-stepping collecting state WSTEP. */ | |
3413 | ||
3414 | static void | |
3415 | release_while_stepping_state (struct wstep_state *wstep) | |
3416 | { | |
3417 | free (wstep); | |
3418 | } | |
3419 | ||
3420 | /* Release all while-stepping collecting states currently associated | |
3421 | with thread TINFO. */ | |
3422 | ||
3423 | void | |
3424 | release_while_stepping_state_list (struct thread_info *tinfo) | |
3425 | { | |
3426 | struct wstep_state *head; | |
3427 | ||
3428 | while (tinfo->while_stepping) | |
3429 | { | |
3430 | head = tinfo->while_stepping; | |
3431 | tinfo->while_stepping = head->next; | |
3432 | release_while_stepping_state (head); | |
3433 | } | |
3434 | } | |
3435 | ||
3436 | /* If TINFO was handling a 'while-stepping' action, the step has | |
3437 | finished, so collect any step data needed, and check if any more | |
3438 | steps are required. Return true if the thread was indeed | |
3439 | collecting tracepoint data, false otherwise. */ | |
3440 | ||
3441 | int | |
3442 | tracepoint_finished_step (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
3443 | { | |
3444 | struct tracepoint *tpoint; | |
3445 | struct wstep_state *wstep; | |
3446 | struct wstep_state **wstep_link; | |
3447 | struct trap_tracepoint_ctx ctx; | |
3448 | ||
fa593d66 PA |
3449 | /* Pull in fast tracepoint trace frames from the inferior lib buffer into |
3450 | our buffer. */ | |
3451 | if (in_process_agent_loaded ()) | |
3452 | upload_fast_traceframes (); | |
3453 | ||
219f2f23 PA |
3454 | /* Check if we were indeed collecting data for one of more |
3455 | tracepoints with a 'while-stepping' count. */ | |
3456 | if (tinfo->while_stepping == NULL) | |
3457 | return 0; | |
3458 | ||
3459 | if (!tracing) | |
3460 | { | |
3461 | /* We're not even tracing anymore. Stop this thread from | |
3462 | collecting. */ | |
3463 | release_while_stepping_state_list (tinfo); | |
3464 | ||
3465 | /* The thread had stopped due to a single-step request indeed | |
3466 | explained by a tracepoint. */ | |
3467 | return 1; | |
3468 | } | |
3469 | ||
3470 | wstep = tinfo->while_stepping; | |
3471 | wstep_link = &tinfo->while_stepping; | |
3472 | ||
3473 | trace_debug ("Thread %s finished a single-step for tracepoint %d at 0x%s", | |
3474 | target_pid_to_str (tinfo->entry.id), | |
3475 | wstep->tp_number, paddress (wstep->tp_address)); | |
3476 | ||
fa593d66 | 3477 | ctx.base.type = trap_tracepoint; |
219f2f23 PA |
3478 | ctx.regcache = get_thread_regcache (tinfo, 1); |
3479 | ||
3480 | while (wstep != NULL) | |
3481 | { | |
3482 | tpoint = find_tracepoint (wstep->tp_number, wstep->tp_address); | |
3483 | if (tpoint == NULL) | |
3484 | { | |
3485 | trace_debug ("NO TRACEPOINT %d at 0x%s FOR THREAD %s!", | |
3486 | wstep->tp_number, paddress (wstep->tp_address), | |
3487 | target_pid_to_str (tinfo->entry.id)); | |
3488 | ||
3489 | /* Unlink. */ | |
3490 | *wstep_link = wstep->next; | |
3491 | release_while_stepping_state (wstep); | |
3492 | continue; | |
3493 | } | |
3494 | ||
3495 | /* We've just finished one step. */ | |
3496 | ++wstep->current_step; | |
3497 | ||
3498 | /* Collect data. */ | |
3499 | collect_data_at_step ((struct tracepoint_hit_ctx *) &ctx, | |
3500 | stop_pc, tpoint, wstep->current_step); | |
3501 | ||
3502 | if (wstep->current_step >= tpoint->step_count) | |
3503 | { | |
3504 | /* The requested numbers of steps have occurred. */ | |
3505 | trace_debug ("Thread %s done stepping for tracepoint %d at 0x%s", | |
3506 | target_pid_to_str (tinfo->entry.id), | |
3507 | wstep->tp_number, paddress (wstep->tp_address)); | |
3508 | ||
3509 | /* Unlink the wstep. */ | |
3510 | *wstep_link = wstep->next; | |
3511 | release_while_stepping_state (wstep); | |
3512 | wstep = *wstep_link; | |
3513 | ||
3514 | /* Only check the hit count now, which ensure that we do all | |
3515 | our stepping before stopping the run. */ | |
3516 | if (tpoint->pass_count > 0 | |
3517 | && tpoint->hit_count >= tpoint->pass_count | |
3518 | && stopping_tracepoint == NULL) | |
3519 | stopping_tracepoint = tpoint; | |
3520 | } | |
3521 | else | |
3522 | { | |
3523 | /* Keep single-stepping until the requested numbers of steps | |
3524 | have occurred. */ | |
3525 | wstep_link = &wstep->next; | |
3526 | wstep = *wstep_link; | |
3527 | } | |
3528 | ||
3529 | if (stopping_tracepoint | |
3530 | || trace_buffer_is_full | |
3531 | || expr_eval_result != expr_eval_no_error) | |
3532 | { | |
3533 | stop_tracing (); | |
3534 | break; | |
3535 | } | |
3536 | } | |
3537 | ||
3538 | return 1; | |
3539 | } | |
3540 | ||
fa593d66 PA |
3541 | /* Handle any internal tracing control breakpoint hits. That means, |
3542 | pull traceframes from the IPA to our buffer, and syncing both | |
3543 | tracing agents when the IPA's tracing stops for some reason. */ | |
3544 | ||
3545 | int | |
3546 | handle_tracepoint_bkpts (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
3547 | { | |
3548 | /* Pull in fast tracepoint trace frames from the inferior in-process | |
3549 | agent's buffer into our buffer. */ | |
3550 | ||
3551 | if (!in_process_agent_loaded ()) | |
3552 | return 0; | |
3553 | ||
3554 | upload_fast_traceframes (); | |
3555 | ||
3556 | /* Check if the in-process agent had decided we should stop | |
3557 | tracing. */ | |
3558 | if (stop_pc == ipa_sym_addrs.addr_stop_tracing) | |
3559 | { | |
3560 | int ipa_trace_buffer_is_full; | |
3561 | CORE_ADDR ipa_stopping_tracepoint; | |
3562 | int ipa_expr_eval_result; | |
3563 | CORE_ADDR ipa_error_tracepoint; | |
3564 | ||
3565 | trace_debug ("lib stopped at stop_tracing"); | |
3566 | ||
3567 | read_inferior_integer (ipa_sym_addrs.addr_trace_buffer_is_full, | |
3568 | &ipa_trace_buffer_is_full); | |
3569 | ||
3570 | read_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, | |
3571 | &ipa_stopping_tracepoint); | |
3572 | write_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, 0); | |
3573 | ||
3574 | read_inferior_data_pointer (ipa_sym_addrs.addr_error_tracepoint, | |
3575 | &ipa_error_tracepoint); | |
3576 | write_inferior_data_pointer (ipa_sym_addrs.addr_error_tracepoint, 0); | |
3577 | ||
3578 | read_inferior_integer (ipa_sym_addrs.addr_expr_eval_result, | |
3579 | &ipa_expr_eval_result); | |
3580 | write_inferior_integer (ipa_sym_addrs.addr_expr_eval_result, 0); | |
3581 | ||
3582 | trace_debug ("lib: trace_buffer_is_full: %d, " | |
3583 | "stopping_tracepoint: %s, " | |
3584 | "ipa_expr_eval_result: %d, " | |
3585 | "error_tracepoint: %s, ", | |
3586 | ipa_trace_buffer_is_full, | |
3587 | paddress (ipa_stopping_tracepoint), | |
3588 | ipa_expr_eval_result, | |
3589 | paddress (ipa_error_tracepoint)); | |
3590 | ||
3591 | if (debug_threads) | |
3592 | { | |
3593 | if (ipa_trace_buffer_is_full) | |
3594 | trace_debug ("lib stopped due to full buffer."); | |
3595 | if (ipa_stopping_tracepoint) | |
3596 | trace_debug ("lib stopped due to tpoint"); | |
3597 | if (ipa_stopping_tracepoint) | |
3598 | trace_debug ("lib stopped due to error"); | |
3599 | } | |
3600 | ||
3601 | if (ipa_stopping_tracepoint != 0) | |
3602 | { | |
3603 | stopping_tracepoint | |
3604 | = fast_tracepoint_from_ipa_tpoint_address (ipa_stopping_tracepoint); | |
3605 | } | |
3606 | else if (ipa_expr_eval_result != expr_eval_no_error) | |
3607 | { | |
3608 | expr_eval_result = ipa_expr_eval_result; | |
3609 | error_tracepoint | |
3610 | = fast_tracepoint_from_ipa_tpoint_address (ipa_error_tracepoint); | |
3611 | } | |
3612 | stop_tracing (); | |
3613 | return 1; | |
3614 | } | |
3615 | else if (stop_pc == ipa_sym_addrs.addr_flush_trace_buffer) | |
3616 | { | |
3617 | trace_debug ("lib stopped at flush_trace_buffer"); | |
3618 | return 1; | |
3619 | } | |
3620 | ||
3621 | return 0; | |
3622 | } | |
3623 | ||
219f2f23 PA |
3624 | /* Return true if TINFO just hit a tracepoint. Collect data if |
3625 | so. */ | |
3626 | ||
3627 | int | |
3628 | tracepoint_was_hit (struct thread_info *tinfo, CORE_ADDR stop_pc) | |
3629 | { | |
3630 | struct tracepoint *tpoint; | |
3631 | int ret = 0; | |
3632 | struct trap_tracepoint_ctx ctx; | |
3633 | ||
3634 | /* Not tracing, don't handle. */ | |
3635 | if (!tracing) | |
3636 | return 0; | |
3637 | ||
fa593d66 | 3638 | ctx.base.type = trap_tracepoint; |
219f2f23 PA |
3639 | ctx.regcache = get_thread_regcache (tinfo, 1); |
3640 | ||
3641 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
3642 | { | |
fa593d66 PA |
3643 | /* Note that we collect fast tracepoints here as well. We'll |
3644 | step over the fast tracepoint jump later, which avoids the | |
3645 | double collect. */ | |
219f2f23 PA |
3646 | if (tpoint->enabled && stop_pc == tpoint->address) |
3647 | { | |
3648 | trace_debug ("Thread %s at address of tracepoint %d at 0x%s", | |
3649 | target_pid_to_str (tinfo->entry.id), | |
3650 | tpoint->number, paddress (tpoint->address)); | |
3651 | ||
3652 | /* Test the condition if present, and collect if true. */ | |
3653 | if (!tpoint->cond | |
3654 | || (condition_true_at_tracepoint | |
3655 | ((struct tracepoint_hit_ctx *) &ctx, tpoint))) | |
3656 | collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
3657 | stop_pc, tpoint); | |
3658 | ||
3659 | if (stopping_tracepoint | |
3660 | || trace_buffer_is_full | |
3661 | || expr_eval_result != expr_eval_no_error) | |
3662 | { | |
3663 | stop_tracing (); | |
3664 | } | |
3665 | /* If the tracepoint had a 'while-stepping' action, then set | |
3666 | the thread to collect this tracepoint on the following | |
3667 | single-steps. */ | |
3668 | else if (tpoint->step_count > 0) | |
3669 | { | |
3670 | add_while_stepping_state (tinfo, | |
3671 | tpoint->number, tpoint->address); | |
3672 | } | |
3673 | ||
3674 | ret = 1; | |
3675 | } | |
3676 | } | |
3677 | ||
3678 | return ret; | |
3679 | } | |
3680 | ||
fa593d66 PA |
3681 | #endif |
3682 | ||
219f2f23 PA |
3683 | /* Create a trace frame for the hit of the given tracepoint in the |
3684 | given thread. */ | |
3685 | ||
3686 | static void | |
3687 | collect_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, CORE_ADDR stop_pc, | |
3688 | struct tracepoint *tpoint) | |
3689 | { | |
3690 | struct traceframe *tframe; | |
3691 | int acti; | |
3692 | ||
3693 | /* Only count it as a hit when we actually collect data. */ | |
3694 | tpoint->hit_count++; | |
3695 | ||
3696 | /* If we've exceeded a defined pass count, record the event for | |
3697 | later, and finish the collection for this hit. This test is only | |
3698 | for nonstepping tracepoints, stepping tracepoints test at the end | |
3699 | of their while-stepping loop. */ | |
3700 | if (tpoint->pass_count > 0 | |
3701 | && tpoint->hit_count >= tpoint->pass_count | |
3702 | && tpoint->step_count == 0 | |
3703 | && stopping_tracepoint == NULL) | |
3704 | stopping_tracepoint = tpoint; | |
3705 | ||
3706 | trace_debug ("Making new traceframe for tracepoint %d at 0x%s, hit %ld", | |
3707 | tpoint->number, paddress (tpoint->address), tpoint->hit_count); | |
3708 | ||
3709 | tframe = add_traceframe (tpoint); | |
3710 | ||
3711 | if (tframe) | |
3712 | { | |
3713 | for (acti = 0; acti < tpoint->numactions; ++acti) | |
3714 | { | |
fa593d66 | 3715 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
3716 | trace_debug ("Tracepoint %d at 0x%s about to do action '%s'", |
3717 | tpoint->number, paddress (tpoint->address), | |
3718 | tpoint->actions_str[acti]); | |
fa593d66 | 3719 | #endif |
219f2f23 PA |
3720 | |
3721 | do_action_at_tracepoint (ctx, stop_pc, tpoint, tframe, | |
3722 | tpoint->actions[acti]); | |
3723 | } | |
3724 | ||
3725 | finish_traceframe (tframe); | |
3726 | } | |
3727 | ||
3728 | if (tframe == NULL && tracing) | |
3729 | trace_buffer_is_full = 1; | |
3730 | } | |
3731 | ||
fa593d66 PA |
3732 | #ifndef IN_PROCESS_AGENT |
3733 | ||
219f2f23 PA |
3734 | static void |
3735 | collect_data_at_step (struct tracepoint_hit_ctx *ctx, | |
3736 | CORE_ADDR stop_pc, | |
3737 | struct tracepoint *tpoint, int current_step) | |
3738 | { | |
3739 | struct traceframe *tframe; | |
3740 | int acti; | |
3741 | ||
3742 | trace_debug ("Making new step traceframe for " | |
3743 | "tracepoint %d at 0x%s, step %d of %ld, hit %ld", | |
3744 | tpoint->number, paddress (tpoint->address), | |
3745 | current_step, tpoint->step_count, | |
3746 | tpoint->hit_count); | |
3747 | ||
3748 | tframe = add_traceframe (tpoint); | |
3749 | ||
3750 | if (tframe) | |
3751 | { | |
3752 | for (acti = 0; acti < tpoint->num_step_actions; ++acti) | |
3753 | { | |
3754 | trace_debug ("Tracepoint %d at 0x%s about to do step action '%s'", | |
3755 | tpoint->number, paddress (tpoint->address), | |
3756 | tpoint->step_actions_str[acti]); | |
3757 | ||
3758 | do_action_at_tracepoint (ctx, stop_pc, tpoint, tframe, | |
3759 | tpoint->step_actions[acti]); | |
3760 | } | |
3761 | ||
3762 | finish_traceframe (tframe); | |
3763 | } | |
3764 | ||
3765 | if (tframe == NULL && tracing) | |
3766 | trace_buffer_is_full = 1; | |
3767 | } | |
3768 | ||
fa593d66 PA |
3769 | #endif |
3770 | ||
219f2f23 PA |
3771 | static struct regcache * |
3772 | get_context_regcache (struct tracepoint_hit_ctx *ctx) | |
3773 | { | |
fa593d66 PA |
3774 | struct regcache *regcache = NULL; |
3775 | ||
3776 | #ifdef IN_PROCESS_AGENT | |
3777 | if (ctx->type == fast_tracepoint) | |
3778 | { | |
3779 | struct fast_tracepoint_ctx *fctx = (struct fast_tracepoint_ctx *) ctx; | |
3780 | if (!fctx->regcache_initted) | |
3781 | { | |
3782 | fctx->regcache_initted = 1; | |
3783 | init_register_cache (&fctx->regcache, fctx->regspace); | |
3784 | supply_regblock (&fctx->regcache, NULL); | |
3785 | supply_fast_tracepoint_registers (&fctx->regcache, fctx->regs); | |
3786 | } | |
3787 | regcache = &fctx->regcache; | |
3788 | } | |
3789 | #else | |
3790 | if (ctx->type == trap_tracepoint) | |
3791 | { | |
3792 | struct trap_tracepoint_ctx *tctx = (struct trap_tracepoint_ctx *) ctx; | |
3793 | regcache = tctx->regcache; | |
3794 | } | |
3795 | #endif | |
219f2f23 PA |
3796 | |
3797 | gdb_assert (regcache != NULL); | |
3798 | ||
3799 | return regcache; | |
3800 | } | |
3801 | ||
3802 | static void | |
3803 | do_action_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
3804 | CORE_ADDR stop_pc, | |
3805 | struct tracepoint *tpoint, | |
3806 | struct traceframe *tframe, | |
3807 | struct tracepoint_action *taction) | |
3808 | { | |
3809 | enum eval_result_type err; | |
3810 | ||
3811 | switch (taction->type) | |
3812 | { | |
3813 | case 'M': | |
3814 | { | |
3815 | struct collect_memory_action *maction; | |
3816 | ||
3817 | maction = (struct collect_memory_action *) taction; | |
3818 | ||
3819 | trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)", | |
3820 | pulongest (maction->len), | |
3821 | paddress (maction->addr), maction->basereg); | |
3822 | /* (should use basereg) */ | |
3823 | agent_mem_read (tframe, NULL, | |
3824 | (CORE_ADDR) maction->addr, maction->len); | |
3825 | break; | |
3826 | } | |
3827 | case 'R': | |
3828 | { | |
3829 | struct collect_registers_action *raction; | |
3830 | ||
3831 | unsigned char *regspace; | |
3832 | struct regcache tregcache; | |
3833 | struct regcache *context_regcache; | |
3834 | ||
3835 | raction = (struct collect_registers_action *) taction; | |
3836 | ||
3837 | trace_debug ("Want to collect registers"); | |
3838 | ||
3839 | /* Collect all registers for now. */ | |
3840 | regspace = add_traceframe_block (tframe, | |
3841 | 1 + register_cache_size ()); | |
3842 | if (regspace == NULL) | |
3843 | { | |
3844 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
3845 | break; | |
3846 | } | |
3847 | /* Identify a register block. */ | |
3848 | *regspace = 'R'; | |
3849 | ||
3850 | context_regcache = get_context_regcache (ctx); | |
3851 | ||
3852 | /* Wrap the regblock in a register cache (in the stack, we | |
3853 | don't want to malloc here). */ | |
3854 | init_register_cache (&tregcache, regspace + 1); | |
3855 | ||
3856 | /* Copy the register data to the regblock. */ | |
3857 | regcache_cpy (&tregcache, context_regcache); | |
3858 | ||
fa593d66 | 3859 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
3860 | /* On some platforms, trap-based tracepoints will have the PC |
3861 | pointing to the next instruction after the trap, but we | |
3862 | don't want the user or GDB trying to guess whether the | |
3863 | saved PC needs adjusting; so always record the adjusted | |
3864 | stop_pc. Note that we can't use tpoint->address instead, | |
fa593d66 PA |
3865 | since it will be wrong for while-stepping actions. This |
3866 | adjustment is a nop for fast tracepoints collected from the | |
3867 | in-process lib (but not if GDBserver is collecting one | |
3868 | preemptively), since the PC had already been adjusted to | |
3869 | contain the tracepoint's address by the jump pad. */ | |
219f2f23 PA |
3870 | trace_debug ("Storing stop pc (0x%s) in regblock", |
3871 | paddress (tpoint->address)); | |
3872 | ||
3873 | /* This changes the regblock, not the thread's | |
3874 | regcache. */ | |
3875 | regcache_write_pc (&tregcache, stop_pc); | |
fa593d66 | 3876 | #endif |
219f2f23 PA |
3877 | } |
3878 | break; | |
3879 | case 'X': | |
3880 | { | |
3881 | struct eval_expr_action *eaction; | |
3882 | ||
3883 | eaction = (struct eval_expr_action *) taction; | |
3884 | ||
3885 | trace_debug ("Want to evaluate expression"); | |
3886 | ||
3887 | err = eval_agent_expr (ctx, tframe, eaction->expr, NULL); | |
3888 | ||
3889 | if (err != expr_eval_no_error) | |
3890 | { | |
3891 | record_tracepoint_error (tpoint, "action expression", err); | |
3892 | return; | |
3893 | } | |
3894 | } | |
3895 | break; | |
3896 | default: | |
3897 | trace_debug ("unknown trace action '%c', ignoring", taction->type); | |
3898 | break; | |
3899 | } | |
3900 | } | |
3901 | ||
3902 | static int | |
3903 | condition_true_at_tracepoint (struct tracepoint_hit_ctx *ctx, | |
3904 | struct tracepoint *tpoint) | |
3905 | { | |
3906 | ULONGEST value = 0; | |
3907 | enum eval_result_type err; | |
3908 | ||
3909 | err = eval_agent_expr (ctx, NULL, tpoint->cond, &value); | |
3910 | ||
3911 | if (err != expr_eval_no_error) | |
3912 | { | |
3913 | record_tracepoint_error (tpoint, "condition", err); | |
3914 | /* The error case must return false. */ | |
3915 | return 0; | |
3916 | } | |
3917 | ||
3918 | trace_debug ("Tracepoint %d at 0x%s condition evals to %s", | |
3919 | tpoint->number, paddress (tpoint->address), | |
3920 | pulongest (value)); | |
3921 | return (value ? 1 : 0); | |
3922 | } | |
3923 | ||
fa593d66 PA |
3924 | #ifndef IN_PROCESS_AGENT |
3925 | ||
219f2f23 PA |
3926 | /* The packet form of an agent expression consists of an 'X', number |
3927 | of bytes in expression, a comma, and then the bytes. */ | |
3928 | ||
3929 | static struct agent_expr * | |
3930 | parse_agent_expr (char **actparm) | |
3931 | { | |
3932 | char *act = *actparm; | |
3933 | ULONGEST xlen; | |
3934 | struct agent_expr *aexpr; | |
3935 | ||
3936 | ++act; /* skip the X */ | |
3937 | act = unpack_varlen_hex (act, &xlen); | |
3938 | ++act; /* skip a comma */ | |
3939 | aexpr = xmalloc (sizeof (struct agent_expr)); | |
3940 | aexpr->length = xlen; | |
3941 | aexpr->bytes = xmalloc (xlen); | |
3942 | convert_ascii_to_int (act, aexpr->bytes, xlen); | |
3943 | *actparm = act + (xlen * 2); | |
3944 | return aexpr; | |
3945 | } | |
3946 | ||
3947 | /* Convert the bytes of an agent expression back into hex digits, so | |
3948 | they can be printed or uploaded. This allocates the buffer, | |
3949 | callers should free when they are done with it. */ | |
3950 | ||
3951 | static char * | |
3952 | unparse_agent_expr (struct agent_expr *aexpr) | |
3953 | { | |
3954 | char *rslt; | |
3955 | ||
3956 | rslt = xmalloc (2 * aexpr->length + 1); | |
3957 | convert_int_to_ascii (aexpr->bytes, rslt, aexpr->length); | |
3958 | return rslt; | |
3959 | } | |
3960 | ||
fa593d66 PA |
3961 | #endif |
3962 | ||
219f2f23 PA |
3963 | /* The agent expression evaluator, as specified by the GDB docs. It |
3964 | returns 0 if everything went OK, and a nonzero error code | |
3965 | otherwise. */ | |
3966 | ||
3967 | static enum eval_result_type | |
3968 | eval_agent_expr (struct tracepoint_hit_ctx *ctx, | |
3969 | struct traceframe *tframe, | |
3970 | struct agent_expr *aexpr, | |
3971 | ULONGEST *rslt) | |
3972 | { | |
3973 | int pc = 0; | |
3974 | #define STACK_MAX 100 | |
3975 | ULONGEST stack[STACK_MAX], top; | |
3976 | int sp = 0; | |
3977 | unsigned char op; | |
3978 | int arg; | |
3979 | ||
3980 | /* This union is a convenient way to convert representations. For | |
3981 | now, assume a standard architecture where the hardware integer | |
3982 | types have 8, 16, 32, 64 bit types. A more robust solution would | |
3983 | be to import stdint.h from gnulib. */ | |
3984 | union | |
3985 | { | |
3986 | union | |
3987 | { | |
3988 | unsigned char bytes[1]; | |
3989 | unsigned char val; | |
3990 | } u8; | |
3991 | union | |
3992 | { | |
3993 | unsigned char bytes[2]; | |
3994 | unsigned short val; | |
3995 | } u16; | |
3996 | union | |
3997 | { | |
3998 | unsigned char bytes[4]; | |
3999 | unsigned int val; | |
4000 | } u32; | |
4001 | union | |
4002 | { | |
4003 | unsigned char bytes[8]; | |
4004 | ULONGEST val; | |
4005 | } u64; | |
4006 | } cnv; | |
4007 | ||
4008 | if (aexpr->length == 0) | |
4009 | { | |
4010 | trace_debug ("empty agent expression"); | |
4011 | return expr_eval_empty_expression; | |
4012 | } | |
4013 | ||
4014 | /* Cache the stack top in its own variable. Much of the time we can | |
4015 | operate on this variable, rather than dinking with the stack. It | |
4016 | needs to be copied to the stack when sp changes. */ | |
4017 | top = 0; | |
4018 | ||
4019 | while (1) | |
4020 | { | |
4021 | op = aexpr->bytes[pc++]; | |
4022 | ||
4023 | trace_debug ("About to interpret byte 0x%x", op); | |
4024 | ||
4025 | switch (op) | |
4026 | { | |
4027 | case gdb_agent_op_add: | |
4028 | top += stack[--sp]; | |
4029 | break; | |
4030 | ||
4031 | case gdb_agent_op_sub: | |
4032 | top = stack[--sp] - top; | |
4033 | break; | |
4034 | ||
4035 | case gdb_agent_op_mul: | |
4036 | top *= stack[--sp]; | |
4037 | break; | |
4038 | ||
4039 | case gdb_agent_op_div_signed: | |
4040 | if (top == 0) | |
4041 | { | |
4042 | trace_debug ("Attempted to divide by zero"); | |
4043 | return expr_eval_divide_by_zero; | |
4044 | } | |
4045 | top = ((LONGEST) stack[--sp]) / ((LONGEST) top); | |
4046 | break; | |
4047 | ||
4048 | case gdb_agent_op_div_unsigned: | |
4049 | if (top == 0) | |
4050 | { | |
4051 | trace_debug ("Attempted to divide by zero"); | |
4052 | return expr_eval_divide_by_zero; | |
4053 | } | |
4054 | top = stack[--sp] / top; | |
4055 | break; | |
4056 | ||
4057 | case gdb_agent_op_rem_signed: | |
4058 | if (top == 0) | |
4059 | { | |
4060 | trace_debug ("Attempted to divide by zero"); | |
4061 | return expr_eval_divide_by_zero; | |
4062 | } | |
4063 | top = ((LONGEST) stack[--sp]) % ((LONGEST) top); | |
4064 | break; | |
4065 | ||
4066 | case gdb_agent_op_rem_unsigned: | |
4067 | if (top == 0) | |
4068 | { | |
4069 | trace_debug ("Attempted to divide by zero"); | |
4070 | return expr_eval_divide_by_zero; | |
4071 | } | |
4072 | top = stack[--sp] % top; | |
4073 | break; | |
4074 | ||
4075 | case gdb_agent_op_lsh: | |
4076 | top = stack[--sp] << top; | |
4077 | break; | |
4078 | ||
4079 | case gdb_agent_op_rsh_signed: | |
4080 | top = ((LONGEST) stack[--sp]) >> top; | |
4081 | break; | |
4082 | ||
4083 | case gdb_agent_op_rsh_unsigned: | |
4084 | top = stack[--sp] >> top; | |
4085 | break; | |
4086 | ||
4087 | case gdb_agent_op_trace: | |
4088 | agent_mem_read (tframe, | |
4089 | NULL, (CORE_ADDR) stack[--sp], (ULONGEST) top); | |
4090 | if (--sp >= 0) | |
4091 | top = stack[sp]; | |
4092 | break; | |
4093 | ||
4094 | case gdb_agent_op_trace_quick: | |
4095 | arg = aexpr->bytes[pc++]; | |
4096 | agent_mem_read (tframe, NULL, (CORE_ADDR) top, (ULONGEST) arg); | |
4097 | break; | |
4098 | ||
4099 | case gdb_agent_op_log_not: | |
4100 | top = !top; | |
4101 | break; | |
4102 | ||
4103 | case gdb_agent_op_bit_and: | |
4104 | top &= stack[--sp]; | |
4105 | break; | |
4106 | ||
4107 | case gdb_agent_op_bit_or: | |
4108 | top |= stack[--sp]; | |
4109 | break; | |
4110 | ||
4111 | case gdb_agent_op_bit_xor: | |
4112 | top ^= stack[--sp]; | |
4113 | break; | |
4114 | ||
4115 | case gdb_agent_op_bit_not: | |
4116 | top = ~top; | |
4117 | break; | |
4118 | ||
4119 | case gdb_agent_op_equal: | |
4120 | top = (stack[--sp] == top); | |
4121 | break; | |
4122 | ||
4123 | case gdb_agent_op_less_signed: | |
4124 | top = (((LONGEST) stack[--sp]) < ((LONGEST) top)); | |
4125 | break; | |
4126 | ||
4127 | case gdb_agent_op_less_unsigned: | |
4128 | top = (stack[--sp] < top); | |
4129 | break; | |
4130 | ||
4131 | case gdb_agent_op_ext: | |
4132 | arg = aexpr->bytes[pc++]; | |
4133 | if (arg < (sizeof (LONGEST) * 8)) | |
4134 | { | |
4135 | LONGEST mask = 1 << (arg - 1); | |
4136 | top &= ((LONGEST) 1 << arg) - 1; | |
4137 | top = (top ^ mask) - mask; | |
4138 | } | |
4139 | break; | |
4140 | ||
4141 | case gdb_agent_op_ref8: | |
4142 | agent_mem_read (tframe, cnv.u8.bytes, (CORE_ADDR) top, 1); | |
4143 | top = cnv.u8.val; | |
4144 | break; | |
4145 | ||
4146 | case gdb_agent_op_ref16: | |
4147 | agent_mem_read (tframe, cnv.u16.bytes, (CORE_ADDR) top, 2); | |
4148 | top = cnv.u16.val; | |
4149 | break; | |
4150 | ||
4151 | case gdb_agent_op_ref32: | |
4152 | agent_mem_read (tframe, cnv.u32.bytes, (CORE_ADDR) top, 4); | |
4153 | top = cnv.u32.val; | |
4154 | break; | |
4155 | ||
4156 | case gdb_agent_op_ref64: | |
4157 | agent_mem_read (tframe, cnv.u64.bytes, (CORE_ADDR) top, 8); | |
4158 | top = cnv.u64.val; | |
4159 | break; | |
4160 | ||
4161 | case gdb_agent_op_if_goto: | |
4162 | if (top) | |
4163 | pc = (aexpr->bytes[pc] << 8) + (aexpr->bytes[pc + 1]); | |
4164 | else | |
4165 | pc += 2; | |
4166 | if (--sp >= 0) | |
4167 | top = stack[sp]; | |
4168 | break; | |
4169 | ||
4170 | case gdb_agent_op_goto: | |
4171 | pc = (aexpr->bytes[pc] << 8) + (aexpr->bytes[pc + 1]); | |
4172 | break; | |
4173 | ||
4174 | case gdb_agent_op_const8: | |
4175 | /* Flush the cached stack top. */ | |
4176 | stack[sp++] = top; | |
4177 | top = aexpr->bytes[pc++]; | |
4178 | break; | |
4179 | ||
4180 | case gdb_agent_op_const16: | |
4181 | /* Flush the cached stack top. */ | |
4182 | stack[sp++] = top; | |
4183 | top = aexpr->bytes[pc++]; | |
4184 | top = (top << 8) + aexpr->bytes[pc++]; | |
4185 | break; | |
4186 | ||
4187 | case gdb_agent_op_const32: | |
4188 | /* Flush the cached stack top. */ | |
4189 | stack[sp++] = top; | |
4190 | top = aexpr->bytes[pc++]; | |
4191 | top = (top << 8) + aexpr->bytes[pc++]; | |
4192 | top = (top << 8) + aexpr->bytes[pc++]; | |
4193 | top = (top << 8) + aexpr->bytes[pc++]; | |
4194 | break; | |
4195 | ||
4196 | case gdb_agent_op_const64: | |
4197 | /* Flush the cached stack top. */ | |
4198 | stack[sp++] = top; | |
4199 | top = aexpr->bytes[pc++]; | |
4200 | top = (top << 8) + aexpr->bytes[pc++]; | |
4201 | top = (top << 8) + aexpr->bytes[pc++]; | |
4202 | top = (top << 8) + aexpr->bytes[pc++]; | |
4203 | top = (top << 8) + aexpr->bytes[pc++]; | |
4204 | top = (top << 8) + aexpr->bytes[pc++]; | |
4205 | top = (top << 8) + aexpr->bytes[pc++]; | |
4206 | top = (top << 8) + aexpr->bytes[pc++]; | |
4207 | break; | |
4208 | ||
4209 | case gdb_agent_op_reg: | |
4210 | /* Flush the cached stack top. */ | |
4211 | stack[sp++] = top; | |
4212 | arg = aexpr->bytes[pc++]; | |
4213 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
4214 | { | |
4215 | int regnum = arg; | |
4216 | struct regcache *regcache; | |
4217 | ||
4218 | regcache = get_context_regcache (ctx); | |
4219 | ||
4220 | switch (register_size (regnum)) | |
4221 | { | |
4222 | case 8: | |
4223 | collect_register (regcache, regnum, cnv.u64.bytes); | |
4224 | top = cnv.u64.val; | |
4225 | break; | |
4226 | case 4: | |
4227 | collect_register (regcache, regnum, cnv.u32.bytes); | |
4228 | top = cnv.u32.val; | |
4229 | break; | |
4230 | case 2: | |
4231 | collect_register (regcache, regnum, cnv.u16.bytes); | |
4232 | top = cnv.u16.val; | |
4233 | break; | |
4234 | case 1: | |
4235 | collect_register (regcache, regnum, cnv.u8.bytes); | |
4236 | top = cnv.u8.val; | |
4237 | break; | |
4238 | default: | |
4239 | internal_error (__FILE__, __LINE__, | |
4240 | "unhandled register size"); | |
4241 | } | |
4242 | } | |
4243 | break; | |
4244 | ||
4245 | case gdb_agent_op_end: | |
4246 | trace_debug ("At end of expression, sp=%d, stack top cache=0x%s", | |
4247 | sp, pulongest (top)); | |
4248 | if (rslt) | |
4249 | { | |
4250 | if (sp <= 0) | |
4251 | { | |
4252 | /* This should be an error */ | |
4253 | trace_debug ("Stack is empty, nothing to return"); | |
4254 | return expr_eval_empty_stack; | |
4255 | } | |
4256 | *rslt = top; | |
4257 | } | |
4258 | return expr_eval_no_error; | |
4259 | ||
4260 | case gdb_agent_op_dup: | |
4261 | stack[sp++] = top; | |
4262 | break; | |
4263 | ||
4264 | case gdb_agent_op_pop: | |
4265 | if (--sp >= 0) | |
4266 | top = stack[sp]; | |
4267 | break; | |
4268 | ||
4269 | case gdb_agent_op_zero_ext: | |
4270 | arg = aexpr->bytes[pc++]; | |
4271 | if (arg < (sizeof (LONGEST) * 8)) | |
4272 | top &= ((LONGEST) 1 << arg) - 1; | |
4273 | break; | |
4274 | ||
4275 | case gdb_agent_op_swap: | |
4276 | /* Interchange top two stack elements, making sure top gets | |
4277 | copied back onto stack. */ | |
4278 | stack[sp] = top; | |
4279 | top = stack[sp - 1]; | |
4280 | stack[sp - 1] = stack[sp]; | |
4281 | break; | |
4282 | ||
4283 | case gdb_agent_op_getv: | |
4284 | /* Flush the cached stack top. */ | |
4285 | stack[sp++] = top; | |
4286 | arg = aexpr->bytes[pc++]; | |
4287 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
4288 | top = get_trace_state_variable_value (arg); | |
4289 | break; | |
4290 | ||
4291 | case gdb_agent_op_setv: | |
4292 | arg = aexpr->bytes[pc++]; | |
4293 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
4294 | set_trace_state_variable_value (arg, top); | |
4295 | /* Note that we leave the value on the stack, for the | |
4296 | benefit of later/enclosing expressions. */ | |
4297 | break; | |
4298 | ||
4299 | case gdb_agent_op_tracev: | |
4300 | arg = aexpr->bytes[pc++]; | |
4301 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
4302 | agent_tsv_read (tframe, arg); | |
4303 | break; | |
4304 | ||
4305 | /* GDB never (currently) generates any of these ops. */ | |
4306 | case gdb_agent_op_float: | |
4307 | case gdb_agent_op_ref_float: | |
4308 | case gdb_agent_op_ref_double: | |
4309 | case gdb_agent_op_ref_long_double: | |
4310 | case gdb_agent_op_l_to_d: | |
4311 | case gdb_agent_op_d_to_l: | |
4312 | case gdb_agent_op_trace16: | |
4313 | trace_debug ("Agent expression op 0x%x valid, but not handled", | |
4314 | op); | |
4315 | /* If ever GDB generates any of these, we don't have the | |
4316 | option of ignoring. */ | |
4317 | return 1; | |
4318 | ||
4319 | default: | |
4320 | trace_debug ("Agent expression op 0x%x not recognized", op); | |
4321 | /* Don't struggle on, things will just get worse. */ | |
4322 | return expr_eval_unrecognized_opcode; | |
4323 | } | |
4324 | ||
4325 | /* Check for stack badness. */ | |
4326 | if (sp >= (STACK_MAX - 1)) | |
4327 | { | |
4328 | trace_debug ("Expression stack overflow"); | |
4329 | return expr_eval_stack_overflow; | |
4330 | } | |
4331 | ||
4332 | if (sp < 0) | |
4333 | { | |
4334 | trace_debug ("Expression stack underflow"); | |
4335 | return expr_eval_stack_underflow; | |
4336 | } | |
4337 | ||
4338 | trace_debug ("Op %s -> sp=%d, top=0x%s", | |
4339 | gdb_agent_op_names[op], sp, pulongest (top)); | |
4340 | } | |
4341 | } | |
4342 | ||
4343 | /* Do memory copies for bytecodes. */ | |
4344 | /* Do the recording of memory blocks for actions and bytecodes. */ | |
4345 | ||
4346 | static int | |
4347 | agent_mem_read (struct traceframe *tframe, | |
4348 | unsigned char *to, CORE_ADDR from, ULONGEST len) | |
4349 | { | |
4350 | unsigned char *mspace; | |
4351 | ULONGEST remaining = len; | |
4352 | unsigned short blocklen; | |
4353 | ||
4354 | /* If a 'to' buffer is specified, use it. */ | |
4355 | if (to != NULL) | |
4356 | { | |
4357 | read_inferior_memory (from, to, len); | |
4358 | return 0; | |
4359 | } | |
4360 | ||
4361 | /* Otherwise, create a new memory block in the trace buffer. */ | |
4362 | while (remaining > 0) | |
4363 | { | |
4364 | size_t sp; | |
4365 | ||
4366 | blocklen = (remaining > 65535 ? 65535 : remaining); | |
4367 | sp = 1 + sizeof (from) + sizeof (blocklen) + blocklen; | |
4368 | mspace = add_traceframe_block (tframe, sp); | |
4369 | if (mspace == NULL) | |
4370 | return 1; | |
4371 | /* Identify block as a memory block. */ | |
4372 | *mspace = 'M'; | |
4373 | ++mspace; | |
4374 | /* Record address and size. */ | |
4375 | memcpy (mspace, &from, sizeof (from)); | |
4376 | mspace += sizeof (from); | |
4377 | memcpy (mspace, &blocklen, sizeof (blocklen)); | |
4378 | mspace += sizeof (blocklen); | |
4379 | /* Record the memory block proper. */ | |
4380 | read_inferior_memory (from, mspace, blocklen); | |
4381 | trace_debug ("%d bytes recorded", blocklen); | |
4382 | remaining -= blocklen; | |
4383 | from += blocklen; | |
4384 | } | |
4385 | return 0; | |
4386 | } | |
4387 | ||
4388 | /* Record the value of a trace state variable. */ | |
4389 | ||
4390 | static int | |
4391 | agent_tsv_read (struct traceframe *tframe, int n) | |
4392 | { | |
4393 | unsigned char *vspace; | |
4394 | LONGEST val; | |
4395 | ||
4396 | vspace = add_traceframe_block (tframe, | |
4397 | 1 + sizeof (n) + sizeof (LONGEST)); | |
4398 | if (vspace == NULL) | |
4399 | return 1; | |
4400 | /* Identify block as a variable. */ | |
4401 | *vspace = 'V'; | |
4402 | /* Record variable's number and value. */ | |
4403 | memcpy (vspace + 1, &n, sizeof (n)); | |
4404 | val = get_trace_state_variable_value (n); | |
4405 | memcpy (vspace + 1 + sizeof (n), &val, sizeof (val)); | |
4406 | trace_debug ("Variable %d recorded", n); | |
4407 | return 0; | |
4408 | } | |
4409 | ||
fa593d66 PA |
4410 | #ifndef IN_PROCESS_AGENT |
4411 | ||
219f2f23 PA |
4412 | static unsigned char * |
4413 | traceframe_find_block_type (unsigned char *database, unsigned int datasize, | |
4414 | int tfnum, char type_wanted) | |
4415 | { | |
4416 | unsigned char *dataptr; | |
4417 | ||
4418 | if (datasize == 0) | |
4419 | { | |
4420 | trace_debug ("traceframe %d has no data", tfnum); | |
4421 | return NULL; | |
4422 | } | |
4423 | ||
4424 | /* Iterate through a traceframe's blocks, looking for a block of the | |
4425 | requested type. */ | |
4426 | for (dataptr = database; | |
4427 | dataptr < database + datasize; | |
4428 | /* nothing */) | |
4429 | { | |
4430 | char blocktype; | |
4431 | unsigned short mlen; | |
4432 | ||
4433 | if (dataptr == trace_buffer_wrap) | |
4434 | { | |
4435 | /* Adjust to reflect wrapping part of the frame around to | |
4436 | the beginning. */ | |
4437 | datasize = dataptr - database; | |
4438 | dataptr = database = trace_buffer_lo; | |
4439 | } | |
4440 | blocktype = *dataptr++; | |
4441 | ||
4442 | if (type_wanted == blocktype) | |
4443 | return dataptr; | |
4444 | ||
4445 | switch (blocktype) | |
4446 | { | |
4447 | case 'R': | |
4448 | /* Skip over the registers block. */ | |
4449 | dataptr += register_cache_size (); | |
4450 | break; | |
4451 | case 'M': | |
4452 | /* Skip over the memory block. */ | |
4453 | dataptr += sizeof (CORE_ADDR); | |
4454 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
4455 | dataptr += (sizeof (mlen) + mlen); | |
4456 | break; | |
219f2f23 PA |
4457 | case 'V': |
4458 | /* Skip over the TSV block. */ | |
4459 | dataptr += (sizeof (int) + sizeof (LONGEST)); | |
4460 | break; | |
4461 | default: | |
4462 | trace_debug ("traceframe %d has unknown block type 0x%x", | |
4463 | tfnum, blocktype); | |
4464 | return NULL; | |
4465 | } | |
4466 | } | |
4467 | ||
4468 | return NULL; | |
4469 | } | |
4470 | ||
4471 | static unsigned char * | |
4472 | traceframe_find_regblock (struct traceframe *tframe, int tfnum) | |
4473 | { | |
4474 | unsigned char *regblock; | |
4475 | ||
4476 | regblock = traceframe_find_block_type (tframe->data, | |
4477 | tframe->data_size, | |
4478 | tfnum, 'R'); | |
4479 | ||
4480 | if (regblock == NULL) | |
4481 | trace_debug ("traceframe %d has no register data", tfnum); | |
4482 | ||
4483 | return regblock; | |
4484 | } | |
4485 | ||
4486 | /* Get registers from a traceframe. */ | |
4487 | ||
4488 | int | |
4489 | fetch_traceframe_registers (int tfnum, struct regcache *regcache, int regnum) | |
4490 | { | |
4491 | unsigned char *dataptr; | |
4492 | struct tracepoint *tpoint; | |
4493 | struct traceframe *tframe; | |
4494 | ||
4495 | tframe = find_traceframe (tfnum); | |
4496 | ||
4497 | if (tframe == NULL) | |
4498 | { | |
4499 | trace_debug ("traceframe %d not found", tfnum); | |
4500 | return 1; | |
4501 | } | |
4502 | ||
4503 | dataptr = traceframe_find_regblock (tframe, tfnum); | |
4504 | if (dataptr == NULL) | |
4505 | { | |
4506 | /* We don't like making up numbers, but GDB has all manner of | |
4507 | troubles when the target says there are no registers. */ | |
4508 | supply_regblock (regcache, NULL); | |
4509 | ||
4510 | /* We can generally guess at a PC, although this will be | |
4511 | misleading for while-stepping frames and multi-location | |
4512 | tracepoints. */ | |
4513 | tpoint = find_next_tracepoint_by_number (NULL, tframe->tpnum); | |
4514 | if (tpoint != NULL) | |
4515 | regcache_write_pc (regcache, tpoint->address); | |
4516 | } | |
4517 | else | |
4518 | supply_regblock (regcache, dataptr); | |
4519 | ||
4520 | return 0; | |
4521 | } | |
4522 | ||
4523 | static CORE_ADDR | |
4524 | traceframe_get_pc (struct traceframe *tframe) | |
4525 | { | |
4526 | struct regcache regcache; | |
4527 | unsigned char *dataptr; | |
4528 | ||
4529 | dataptr = traceframe_find_regblock (tframe, -1); | |
4530 | if (dataptr == NULL) | |
4531 | return 0; | |
4532 | ||
4533 | init_register_cache (®cache, dataptr); | |
4534 | return regcache_read_pc (®cache); | |
4535 | } | |
4536 | ||
4537 | /* Read a requested block of memory from a trace frame. */ | |
4538 | ||
4539 | int | |
4540 | traceframe_read_mem (int tfnum, CORE_ADDR addr, | |
4541 | unsigned char *buf, ULONGEST length, | |
4542 | ULONGEST *nbytes) | |
4543 | { | |
4544 | struct traceframe *tframe; | |
4545 | unsigned char *database, *dataptr; | |
4546 | unsigned int datasize; | |
4547 | CORE_ADDR maddr; | |
4548 | unsigned short mlen; | |
4549 | ||
4550 | trace_debug ("traceframe_read_mem"); | |
4551 | ||
4552 | tframe = find_traceframe (tfnum); | |
4553 | ||
4554 | if (!tframe) | |
4555 | { | |
4556 | trace_debug ("traceframe %d not found", tfnum); | |
4557 | return 1; | |
4558 | } | |
4559 | ||
4560 | datasize = tframe->data_size; | |
4561 | database = dataptr = &tframe->data[0]; | |
4562 | ||
4563 | /* Iterate through a traceframe's blocks, looking for memory. */ | |
4564 | while ((dataptr = traceframe_find_block_type (dataptr, | |
4565 | datasize - (dataptr - database), | |
4566 | tfnum, 'M')) != NULL) | |
4567 | { | |
4568 | memcpy (&maddr, dataptr, sizeof (maddr)); | |
4569 | dataptr += sizeof (maddr); | |
4570 | memcpy (&mlen, dataptr, sizeof (mlen)); | |
4571 | dataptr += sizeof (mlen); | |
4572 | trace_debug ("traceframe %d has %d bytes at %s", | |
4573 | tfnum, mlen, paddress (maddr)); | |
4574 | ||
4575 | /* Check that requested data is in bounds. */ | |
4576 | if (maddr <= addr && (addr + length) <= (maddr + mlen)) | |
4577 | { | |
4578 | /* Block includes the requested range, copy it out. */ | |
4579 | memcpy (buf, dataptr + (addr - maddr), length); | |
4580 | *nbytes = length; | |
4581 | return 0; | |
4582 | } | |
4583 | ||
4584 | /* Skip over this block. */ | |
4585 | dataptr += mlen; | |
4586 | } | |
4587 | ||
4588 | trace_debug ("traceframe %d has no memory data for the desired region", | |
4589 | tfnum); | |
4590 | ||
4591 | *nbytes = 0; | |
4592 | return 0; | |
4593 | } | |
4594 | ||
4595 | static int | |
4596 | traceframe_read_tsv (int tsvnum, LONGEST *val) | |
4597 | { | |
4598 | int tfnum; | |
4599 | struct traceframe *tframe; | |
4600 | unsigned char *database, *dataptr; | |
4601 | unsigned int datasize; | |
4602 | int vnum; | |
4603 | ||
4604 | trace_debug ("traceframe_read_tsv"); | |
4605 | ||
4606 | tfnum = current_traceframe; | |
4607 | ||
4608 | if (tfnum < 0) | |
4609 | { | |
4610 | trace_debug ("no current traceframe"); | |
4611 | return 1; | |
4612 | } | |
4613 | ||
4614 | tframe = find_traceframe (tfnum); | |
4615 | ||
4616 | if (tframe == NULL) | |
4617 | { | |
4618 | trace_debug ("traceframe %d not found", tfnum); | |
4619 | return 1; | |
4620 | } | |
4621 | ||
4622 | datasize = tframe->data_size; | |
4623 | database = dataptr = &tframe->data[0]; | |
4624 | ||
4625 | /* Iterate through a traceframe's blocks, looking for the tsv. */ | |
4626 | while ((dataptr = traceframe_find_block_type (dataptr, | |
4627 | datasize - (dataptr - database), | |
4628 | tfnum, 'V')) != NULL) | |
4629 | { | |
4630 | memcpy (&vnum, dataptr, sizeof (vnum)); | |
4631 | dataptr += sizeof (vnum); | |
4632 | ||
4633 | trace_debug ("traceframe %d has variable %d", tfnum, vnum); | |
4634 | ||
4635 | /* Check that this is the variable we want. */ | |
4636 | if (tsvnum == vnum) | |
4637 | { | |
4638 | memcpy (val, dataptr, sizeof (*val)); | |
4639 | return 0; | |
4640 | } | |
4641 | ||
4642 | /* Skip over this block. */ | |
4643 | dataptr += sizeof (LONGEST); | |
4644 | } | |
4645 | ||
4646 | trace_debug ("traceframe %d has no data for variable %d", | |
4647 | tfnum, tsvnum); | |
4648 | return 1; | |
4649 | } | |
4650 | ||
fa593d66 PA |
4651 | /* Return the first fast tracepoint whose jump pad contains PC. */ |
4652 | ||
4653 | static struct tracepoint * | |
4654 | fast_tracepoint_from_jump_pad_address (CORE_ADDR pc) | |
4655 | { | |
4656 | struct tracepoint *tpoint; | |
4657 | ||
4658 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
4659 | if (tpoint->type == fast_tracepoint) | |
4660 | if (tpoint->jump_pad <= pc && pc < tpoint->jump_pad_end) | |
4661 | return tpoint; | |
4662 | ||
4663 | return NULL; | |
4664 | } | |
4665 | ||
4666 | /* Return GDBserver's tracepoint that matches the IP Agent's | |
4667 | tracepoint object that lives at IPA_TPOINT_OBJ in the IP Agent's | |
4668 | address space. */ | |
4669 | ||
4670 | static struct tracepoint * | |
4671 | fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR ipa_tpoint_obj) | |
4672 | { | |
4673 | struct tracepoint *tpoint; | |
4674 | ||
4675 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
4676 | if (tpoint->type == fast_tracepoint) | |
4677 | if (tpoint->obj_addr_on_target == ipa_tpoint_obj) | |
4678 | return tpoint; | |
4679 | ||
4680 | return NULL; | |
4681 | } | |
4682 | ||
4683 | #endif | |
4684 | ||
4685 | /* The type of the object that is used to synchronize fast tracepoint | |
4686 | collection. */ | |
4687 | ||
4688 | typedef struct collecting_t | |
4689 | { | |
4690 | /* The fast tracepoint number currently collecting. */ | |
4691 | uintptr_t tpoint; | |
4692 | ||
4693 | /* A number that GDBserver can use to identify the thread that is | |
4694 | presently holding the collect lock. This need not (and usually | |
4695 | is not) the thread id, as getting the current thread ID usually | |
4696 | requires a system call, which we want to avoid like the plague. | |
4697 | Usually this is thread's TCB, found in the TLS (pseudo-) | |
4698 | register, which is readable with a single insn on several | |
4699 | architectures. */ | |
4700 | uintptr_t thread_area; | |
4701 | } collecting_t; | |
4702 | ||
4703 | #ifndef IN_PROCESS_AGENT | |
4704 | ||
4705 | void | |
4706 | force_unlock_trace_buffer (void) | |
4707 | { | |
4708 | write_inferior_data_pointer (ipa_sym_addrs.addr_collecting, 0); | |
4709 | } | |
4710 | ||
4711 | /* Check if the thread identified by THREAD_AREA which is stopped at | |
4712 | STOP_PC, is presently locking the fast tracepoint collection, and | |
4713 | if so, gather some status of said collection. Returns 0 if the | |
4714 | thread isn't collecting or in the jump pad at all. 1, if in the | |
4715 | jump pad (or within gdb_collect) and hasn't executed the adjusted | |
4716 | original insn yet (can set a breakpoint there and run to it). 2, | |
4717 | if presently executing the adjusted original insn --- in which | |
4718 | case, if we want to move the thread out of the jump pad, we need to | |
4719 | single-step it until this function returns 0. */ | |
4720 | ||
4721 | int | |
4722 | fast_tracepoint_collecting (CORE_ADDR thread_area, | |
4723 | CORE_ADDR stop_pc, | |
4724 | struct fast_tpoint_collect_status *status) | |
4725 | { | |
4726 | CORE_ADDR ipa_collecting; | |
4727 | CORE_ADDR ipa_gdb_jump_pad_buffer, ipa_gdb_jump_pad_buffer_end; | |
4728 | struct tracepoint *tpoint; | |
4729 | int needs_breakpoint; | |
4730 | ||
4731 | /* The thread THREAD_AREA is either: | |
4732 | ||
4733 | 0. not collecting at all, not within the jump pad, or within | |
4734 | gdb_collect or one of its callees. | |
4735 | ||
4736 | 1. in the jump pad and haven't reached gdb_collect | |
4737 | ||
4738 | 2. within gdb_collect (out of the jump pad) (collect is set) | |
4739 | ||
4740 | 3. we're in the jump pad, after gdb_collect having returned, | |
4741 | possibly executing the adjusted insns. | |
4742 | ||
4743 | For cases 1 and 3, `collecting' may or not be set. The jump pad | |
4744 | doesn't have any complicated jump logic, so we can tell if the | |
4745 | thread is executing the adjust original insn or not by just | |
4746 | matching STOP_PC with known jump pad addresses. If we it isn't | |
4747 | yet executing the original insn, set a breakpoint there, and let | |
4748 | the thread run to it, so to quickly step over a possible (many | |
4749 | insns) gdb_collect call. Otherwise, or when the breakpoint is | |
4750 | hit, only a few (small number of) insns are left to be executed | |
4751 | in the jump pad. Single-step the thread until it leaves the | |
4752 | jump pad. */ | |
4753 | ||
4754 | again: | |
4755 | tpoint = NULL; | |
4756 | needs_breakpoint = 0; | |
4757 | trace_debug ("fast_tracepoint_collecting"); | |
4758 | ||
4759 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer, | |
4760 | &ipa_gdb_jump_pad_buffer)) | |
4761 | fatal ("error extracting `gdb_jump_pad_buffer'"); | |
4762 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer_end, | |
4763 | &ipa_gdb_jump_pad_buffer_end)) | |
4764 | fatal ("error extracting `gdb_jump_pad_buffer_end'"); | |
4765 | ||
4766 | if (ipa_gdb_jump_pad_buffer <= stop_pc && stop_pc < ipa_gdb_jump_pad_buffer_end) | |
4767 | { | |
4768 | /* We can tell which tracepoint(s) the thread is collecting by | |
4769 | matching the jump pad address back to the tracepoint. */ | |
4770 | tpoint = fast_tracepoint_from_jump_pad_address (stop_pc); | |
4771 | if (tpoint == NULL) | |
4772 | { | |
4773 | warning ("in jump pad, but no matching tpoint?"); | |
4774 | return 0; | |
4775 | } | |
4776 | else | |
4777 | { | |
4778 | trace_debug ("in jump pad of tpoint (%d, %s); jump_pad(%s, %s); " | |
4779 | "adj_insn(%s, %s)", | |
4780 | tpoint->number, paddress (tpoint->address), | |
4781 | paddress (tpoint->jump_pad), | |
4782 | paddress (tpoint->jump_pad_end), | |
4783 | paddress (tpoint->adjusted_insn_addr), | |
4784 | paddress (tpoint->adjusted_insn_addr_end)); | |
4785 | } | |
4786 | ||
4787 | /* Definitely in the jump pad. May or may not need | |
4788 | fast-exit-jump-pad breakpoint. */ | |
4789 | if (tpoint->jump_pad <= stop_pc | |
4790 | && stop_pc < tpoint->adjusted_insn_addr) | |
4791 | needs_breakpoint = 1; | |
4792 | } | |
4793 | else | |
4794 | { | |
4795 | collecting_t ipa_collecting_obj; | |
4796 | ||
4797 | /* If `collecting' is set/locked, then the THREAD_AREA thread | |
4798 | may or not be the one holding the lock. We have to read the | |
4799 | lock to find out. */ | |
4800 | ||
4801 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_collecting, | |
4802 | &ipa_collecting)) | |
4803 | { | |
4804 | trace_debug ("fast_tracepoint_collecting:" | |
4805 | " failed reading 'collecting' in the inferior"); | |
4806 | return 0; | |
4807 | } | |
4808 | ||
4809 | if (!ipa_collecting) | |
4810 | { | |
4811 | trace_debug ("fast_tracepoint_collecting: not collecting" | |
4812 | " (and nobody is)."); | |
4813 | return 0; | |
4814 | } | |
4815 | ||
4816 | /* Some thread is collecting. Check which. */ | |
4817 | if (read_inferior_memory (ipa_collecting, | |
4818 | (unsigned char *) &ipa_collecting_obj, | |
4819 | sizeof (ipa_collecting_obj)) != 0) | |
4820 | goto again; | |
4821 | ||
4822 | if (ipa_collecting_obj.thread_area != thread_area) | |
4823 | { | |
4824 | trace_debug ("fast_tracepoint_collecting: not collecting " | |
4825 | "(another thread is)"); | |
4826 | return 0; | |
4827 | } | |
4828 | ||
4829 | tpoint | |
4830 | = fast_tracepoint_from_ipa_tpoint_address (ipa_collecting_obj.tpoint); | |
4831 | if (tpoint == NULL) | |
4832 | { | |
4833 | warning ("fast_tracepoint_collecting: collecting, " | |
4834 | "but tpoint %s not found?", | |
4835 | paddress ((CORE_ADDR) ipa_collecting_obj.tpoint)); | |
4836 | return 0; | |
4837 | } | |
4838 | ||
4839 | /* The thread is within `gdb_collect', skip over the rest of | |
4840 | fast tracepoint collection quickly using a breakpoint. */ | |
4841 | needs_breakpoint = 1; | |
4842 | } | |
4843 | ||
4844 | /* The caller wants a bit of status detail. */ | |
4845 | if (status != NULL) | |
4846 | { | |
4847 | status->tpoint_num = tpoint->number; | |
4848 | status->tpoint_addr = tpoint->address; | |
4849 | status->adjusted_insn_addr = tpoint->adjusted_insn_addr; | |
4850 | status->adjusted_insn_addr_end = tpoint->adjusted_insn_addr_end; | |
4851 | } | |
4852 | ||
4853 | if (needs_breakpoint) | |
4854 | { | |
4855 | /* Hasn't executed the original instruction yet. Set breakpoint | |
4856 | there, and wait till it's hit, then single-step until exiting | |
4857 | the jump pad. */ | |
4858 | ||
4859 | trace_debug ("\ | |
4860 | fast_tracepoint_collecting, returning continue-until-break at %s", | |
4861 | paddress (tpoint->adjusted_insn_addr)); | |
4862 | ||
4863 | return 1; /* continue */ | |
4864 | } | |
4865 | else | |
4866 | { | |
4867 | /* Just single-step until exiting the jump pad. */ | |
4868 | ||
4869 | trace_debug ("fast_tracepoint_collecting, returning " | |
4870 | "need-single-step (%s-%s)", | |
4871 | paddress (tpoint->adjusted_insn_addr), | |
4872 | paddress (tpoint->adjusted_insn_addr_end)); | |
4873 | ||
4874 | return 2; /* single-step */ | |
4875 | } | |
4876 | } | |
4877 | ||
4878 | #endif | |
4879 | ||
4880 | #ifdef IN_PROCESS_AGENT | |
4881 | ||
4882 | /* The global fast tracepoint collect lock. Points to a collecting_t | |
4883 | object built on the stack by the jump pad, if presently locked; | |
4884 | NULL if it isn't locked. Note that this lock *must* be set while | |
4885 | executing any *function other than the jump pad. See | |
4886 | fast_tracepoint_collecting. */ | |
4887 | static collecting_t * ATTR_USED collecting; | |
4888 | ||
4889 | /* This routine, called from the jump pad (in asm) is designed to be | |
4890 | called from the jump pads of fast tracepoints, thus it is on the | |
4891 | critical path. */ | |
4892 | ||
4893 | IP_AGENT_EXPORT void ATTR_USED | |
4894 | gdb_collect (struct tracepoint *tpoint, unsigned char *regs) | |
4895 | { | |
4896 | struct fast_tracepoint_ctx ctx; | |
4897 | ||
4898 | /* Don't do anything until the trace run is completely set up. */ | |
4899 | if (!tracing) | |
4900 | return; | |
4901 | ||
4902 | ctx.base.type = fast_tracepoint; | |
4903 | ctx.regs = regs; | |
4904 | ctx.regcache_initted = 0; | |
4905 | ctx.tpoint = tpoint; | |
4906 | ||
4907 | /* Wrap the regblock in a register cache (in the stack, we don't | |
4908 | want to malloc here). */ | |
4909 | ctx.regspace = alloca (register_cache_size ()); | |
4910 | if (ctx.regspace == NULL) | |
4911 | { | |
4912 | trace_debug ("Trace buffer block allocation failed, skipping"); | |
4913 | return; | |
4914 | } | |
4915 | ||
4916 | /* Test the condition if present, and collect if true. */ | |
4917 | if (tpoint->cond == NULL | |
4918 | || condition_true_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
4919 | tpoint)) | |
4920 | { | |
4921 | collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx, | |
4922 | tpoint->address, tpoint); | |
4923 | ||
4924 | /* Note that this will cause original insns to be written back | |
4925 | to where we jumped from, but that's OK because we're jumping | |
4926 | back to the next whole instruction. This will go badly if | |
4927 | instruction restoration is not atomic though. */ | |
4928 | if (stopping_tracepoint | |
4929 | || trace_buffer_is_full | |
4930 | || expr_eval_result != expr_eval_no_error) | |
4931 | stop_tracing (); | |
4932 | } | |
4933 | else | |
4934 | { | |
4935 | /* If there was a condition and it evaluated to false, the only | |
4936 | way we would stop tracing is if there was an error during | |
4937 | condition expression evaluation. */ | |
4938 | if (expr_eval_result != expr_eval_no_error) | |
4939 | stop_tracing (); | |
4940 | } | |
4941 | } | |
4942 | ||
4943 | #endif | |
4944 | ||
4945 | #ifndef IN_PROCESS_AGENT | |
4946 | ||
4947 | /* We'll need to adjust these when we consider bi-arch setups, and big | |
4948 | endian machines. */ | |
4949 | ||
4950 | static int | |
4951 | write_inferior_data_ptr (CORE_ADDR where, CORE_ADDR ptr) | |
4952 | { | |
4953 | return write_inferior_memory (where, | |
4954 | (unsigned char *) &ptr, sizeof (void *)); | |
4955 | } | |
4956 | ||
4957 | /* The base pointer of the IPA's heap. This is the only memory the | |
4958 | IPA is allowed to use. The IPA should _not_ call the inferior's | |
4959 | `malloc' during operation. That'd be slow, and, most importantly, | |
4960 | it may not be safe. We may be collecting a tracepoint in a signal | |
4961 | handler, for example. */ | |
4962 | static CORE_ADDR target_tp_heap; | |
4963 | ||
4964 | /* Allocate at least SIZE bytes of memory from the IPA heap, aligned | |
4965 | to 8 bytes. */ | |
4966 | ||
4967 | static CORE_ADDR | |
4968 | target_malloc (ULONGEST size) | |
4969 | { | |
4970 | CORE_ADDR ptr; | |
4971 | ||
4972 | if (target_tp_heap == 0) | |
4973 | { | |
4974 | /* We have the pointer *address*, need what it points to. */ | |
4975 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_tp_heap_buffer, | |
4976 | &target_tp_heap)) | |
4977 | fatal ("could get target heap head pointer"); | |
4978 | } | |
4979 | ||
4980 | ptr = target_tp_heap; | |
4981 | target_tp_heap += size; | |
4982 | ||
4983 | /* Pad to 8-byte alignment. */ | |
4984 | target_tp_heap = ((target_tp_heap + 7) & ~0x7); | |
4985 | ||
4986 | return ptr; | |
4987 | } | |
4988 | ||
4989 | static CORE_ADDR | |
4990 | download_agent_expr (struct agent_expr *expr) | |
4991 | { | |
4992 | CORE_ADDR expr_addr; | |
4993 | CORE_ADDR expr_bytes; | |
4994 | ||
4995 | expr_addr = target_malloc (sizeof (*expr)); | |
4996 | write_inferior_memory (expr_addr, (unsigned char *) expr, sizeof (*expr)); | |
4997 | ||
4998 | expr_bytes = target_malloc (expr->length); | |
4999 | write_inferior_data_ptr (expr_addr + offsetof (struct agent_expr, bytes), | |
5000 | expr_bytes); | |
5001 | write_inferior_memory (expr_bytes, expr->bytes, expr->length); | |
5002 | ||
5003 | return expr_addr; | |
5004 | } | |
5005 | ||
5006 | /* Align V up to N bits. */ | |
5007 | #define UALIGN(V, N) (((V) + ((N) - 1)) & ~((N) - 1)) | |
5008 | ||
5009 | static void | |
5010 | download_tracepoints (void) | |
5011 | { | |
5012 | CORE_ADDR tpptr = 0, prev_tpptr = 0; | |
5013 | struct tracepoint *tpoint; | |
5014 | ||
5015 | /* Start out empty. */ | |
5016 | write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints, 0); | |
5017 | ||
5018 | for (tpoint = tracepoints; tpoint; tpoint = tpoint->next) | |
5019 | { | |
5020 | struct tracepoint target_tracepoint; | |
5021 | ||
5022 | if (tpoint->type != fast_tracepoint) | |
5023 | continue; | |
5024 | ||
5025 | target_tracepoint = *tpoint; | |
5026 | ||
5027 | prev_tpptr = tpptr; | |
5028 | tpptr = target_malloc (sizeof (*tpoint)); | |
5029 | tpoint->obj_addr_on_target = tpptr; | |
5030 | ||
5031 | if (tpoint == tracepoints) | |
5032 | { | |
5033 | /* First object in list, set the head pointer in the | |
5034 | inferior. */ | |
5035 | write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints, tpptr); | |
5036 | } | |
5037 | else | |
5038 | { | |
5039 | write_inferior_data_ptr (prev_tpptr + offsetof (struct tracepoint, | |
5040 | next), | |
5041 | tpptr); | |
5042 | } | |
5043 | ||
5044 | /* Write the whole object. We'll fix up its pointers in a bit. | |
5045 | Assume no next for now. This is fixed up above on the next | |
5046 | iteration, if there's any. */ | |
5047 | target_tracepoint.next = NULL; | |
5048 | /* Need to clear this here too, since we're downloading the | |
5049 | tracepoints before clearing our own copy. */ | |
5050 | target_tracepoint.hit_count = 0; | |
5051 | ||
5052 | write_inferior_memory (tpptr, (unsigned char *) &target_tracepoint, | |
5053 | sizeof (target_tracepoint)); | |
5054 | ||
5055 | if (tpoint->cond) | |
5056 | write_inferior_data_ptr (tpptr + offsetof (struct tracepoint, | |
5057 | cond), | |
5058 | download_agent_expr (tpoint->cond)); | |
5059 | ||
5060 | if (tpoint->numactions) | |
5061 | { | |
5062 | int i; | |
5063 | CORE_ADDR actions_array; | |
5064 | ||
5065 | /* The pointers array. */ | |
5066 | actions_array | |
5067 | = target_malloc (sizeof (*tpoint->actions) * tpoint->numactions); | |
5068 | write_inferior_data_ptr (tpptr + offsetof (struct tracepoint, | |
5069 | actions), | |
5070 | actions_array); | |
5071 | ||
5072 | /* Now for each pointer, download the action. */ | |
5073 | for (i = 0; i < tpoint->numactions; i++) | |
5074 | { | |
5075 | CORE_ADDR ipa_action = 0; | |
5076 | struct tracepoint_action *action = tpoint->actions[i]; | |
5077 | ||
5078 | switch (action->type) | |
5079 | { | |
5080 | case 'M': | |
5081 | ipa_action | |
5082 | = target_malloc (sizeof (struct collect_memory_action)); | |
5083 | write_inferior_memory (ipa_action, | |
5084 | (unsigned char *) action, | |
5085 | sizeof (struct collect_memory_action)); | |
5086 | break; | |
5087 | case 'R': | |
5088 | ipa_action | |
5089 | = target_malloc (sizeof (struct collect_registers_action)); | |
5090 | write_inferior_memory (ipa_action, | |
5091 | (unsigned char *) action, | |
5092 | sizeof (struct collect_registers_action)); | |
5093 | break; | |
5094 | case 'X': | |
5095 | { | |
5096 | CORE_ADDR expr; | |
5097 | struct eval_expr_action *eaction | |
5098 | = (struct eval_expr_action *) action; | |
5099 | ||
5100 | ipa_action = target_malloc (sizeof (*eaction)); | |
5101 | write_inferior_memory (ipa_action, | |
5102 | (unsigned char *) eaction, | |
5103 | sizeof (*eaction)); | |
5104 | ||
5105 | expr = download_agent_expr (eaction->expr); | |
5106 | write_inferior_data_ptr | |
5107 | (ipa_action + offsetof (struct eval_expr_action, expr), | |
5108 | expr); | |
5109 | break; | |
5110 | } | |
5111 | default: | |
5112 | trace_debug ("unknown trace action '%c', ignoring", | |
5113 | action->type); | |
5114 | break; | |
5115 | } | |
5116 | ||
5117 | if (ipa_action != 0) | |
5118 | write_inferior_data_ptr | |
5119 | (actions_array + i * sizeof (sizeof (*tpoint->actions)), | |
5120 | ipa_action); | |
5121 | } | |
5122 | } | |
5123 | } | |
5124 | } | |
5125 | ||
5126 | static void | |
5127 | download_trace_state_variables (void) | |
5128 | { | |
5129 | CORE_ADDR ptr = 0, prev_ptr = 0; | |
5130 | struct trace_state_variable *tsv; | |
5131 | ||
5132 | /* Start out empty. */ | |
5133 | write_inferior_data_ptr (ipa_sym_addrs.addr_trace_state_variables, 0); | |
5134 | ||
5135 | for (tsv = trace_state_variables; tsv != NULL; tsv = tsv->next) | |
5136 | { | |
5137 | struct trace_state_variable target_tsv; | |
5138 | ||
5139 | /* TSV's with a getter have been initialized equally in both the | |
5140 | inferior and GDBserver. Skip them. */ | |
5141 | if (tsv->getter != NULL) | |
5142 | continue; | |
5143 | ||
5144 | target_tsv = *tsv; | |
5145 | ||
5146 | prev_ptr = ptr; | |
5147 | ptr = target_malloc (sizeof (*tsv)); | |
5148 | ||
5149 | if (tsv == trace_state_variables) | |
5150 | { | |
5151 | /* First object in list, set the head pointer in the | |
5152 | inferior. */ | |
5153 | ||
5154 | write_inferior_data_ptr (ipa_sym_addrs.addr_trace_state_variables, | |
5155 | ptr); | |
5156 | } | |
5157 | else | |
5158 | { | |
5159 | write_inferior_data_ptr (prev_ptr | |
5160 | + offsetof (struct trace_state_variable, | |
5161 | next), | |
5162 | ptr); | |
5163 | } | |
5164 | ||
5165 | /* Write the whole object. We'll fix up its pointers in a bit. | |
5166 | Assume no next, fixup when needed. */ | |
5167 | target_tsv.next = NULL; | |
5168 | ||
5169 | write_inferior_memory (ptr, (unsigned char *) &target_tsv, | |
5170 | sizeof (target_tsv)); | |
5171 | ||
5172 | if (tsv->name != NULL) | |
5173 | { | |
5174 | size_t size = strlen (tsv->name) + 1; | |
5175 | CORE_ADDR name_addr = target_malloc (size); | |
5176 | write_inferior_memory (name_addr, | |
5177 | (unsigned char *) tsv->name, size); | |
5178 | write_inferior_data_ptr (ptr | |
5179 | + offsetof (struct trace_state_variable, | |
5180 | name), | |
5181 | name_addr); | |
5182 | } | |
5183 | ||
5184 | if (tsv->getter != NULL) | |
5185 | { | |
5186 | fatal ("what to do with these?"); | |
5187 | } | |
5188 | } | |
5189 | ||
5190 | if (prev_ptr != 0) | |
5191 | { | |
5192 | /* Fixup the next pointer in the last item in the list. */ | |
5193 | write_inferior_data_ptr (prev_ptr + offsetof (struct trace_state_variable, | |
5194 | next), 0); | |
5195 | } | |
5196 | } | |
5197 | ||
5198 | /* Upload complete trace frames out of the IP Agent's trace buffer | |
5199 | into GDBserver's trace buffer. This always uploads either all or | |
5200 | no trace frames. This is the counter part of | |
5201 | `trace_alloc_trace_buffer'. See its description of the atomic | |
5202 | synching mechanism. */ | |
5203 | ||
5204 | static void | |
5205 | upload_fast_traceframes (void) | |
5206 | { | |
5207 | unsigned int ipa_traceframe_read_count, ipa_traceframe_write_count; | |
5208 | unsigned int ipa_traceframe_read_count_racy, ipa_traceframe_write_count_racy; | |
5209 | CORE_ADDR tf; | |
5210 | struct ipa_trace_buffer_control ipa_trace_buffer_ctrl; | |
5211 | unsigned int curr_tbctrl_idx; | |
5212 | unsigned int ipa_trace_buffer_ctrl_curr; | |
5213 | unsigned int ipa_trace_buffer_ctrl_curr_old; | |
5214 | CORE_ADDR ipa_trace_buffer_ctrl_addr; | |
5215 | struct breakpoint *about_to_request_buffer_space_bkpt; | |
5216 | CORE_ADDR ipa_trace_buffer_lo; | |
5217 | CORE_ADDR ipa_trace_buffer_hi; | |
5218 | ||
5219 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, | |
5220 | &ipa_traceframe_read_count_racy)) | |
5221 | { | |
5222 | /* This will happen in most targets if the current thread is | |
5223 | running. */ | |
5224 | return; | |
5225 | } | |
5226 | ||
5227 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, | |
5228 | &ipa_traceframe_write_count_racy)) | |
5229 | return; | |
5230 | ||
5231 | trace_debug ("ipa_traceframe_count (racy area): %d (w=%d, r=%d)", | |
5232 | ipa_traceframe_write_count_racy - ipa_traceframe_read_count_racy, | |
5233 | ipa_traceframe_write_count_racy, ipa_traceframe_read_count_racy); | |
5234 | ||
5235 | if (ipa_traceframe_write_count_racy == ipa_traceframe_read_count_racy) | |
5236 | return; | |
5237 | ||
5238 | about_to_request_buffer_space_bkpt | |
5239 | = set_breakpoint_at (ipa_sym_addrs.addr_about_to_request_buffer_space, | |
5240 | NULL); | |
5241 | ||
5242 | if (read_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, | |
5243 | &ipa_trace_buffer_ctrl_curr)) | |
5244 | return; | |
5245 | ||
5246 | ipa_trace_buffer_ctrl_curr_old = ipa_trace_buffer_ctrl_curr; | |
5247 | ||
5248 | curr_tbctrl_idx = ipa_trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK; | |
5249 | ||
5250 | { | |
5251 | unsigned int prev, counter; | |
5252 | ||
5253 | /* Update the token, with new counters, and the GDBserver stamp | |
5254 | bit. Alway reuse the current TBC index. */ | |
5255 | prev = ipa_trace_buffer_ctrl_curr & 0x0007ff00; | |
5256 | counter = (prev + 0x100) & 0x0007ff00; | |
5257 | ||
5258 | ipa_trace_buffer_ctrl_curr = (0x80000000 | |
5259 | | (prev << 12) | |
5260 | | counter | |
5261 | | curr_tbctrl_idx); | |
5262 | } | |
5263 | ||
5264 | if (write_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, | |
5265 | ipa_trace_buffer_ctrl_curr)) | |
5266 | return; | |
5267 | ||
5268 | trace_debug ("Lib: Committed %08x -> %08x", | |
5269 | ipa_trace_buffer_ctrl_curr_old, | |
5270 | ipa_trace_buffer_ctrl_curr); | |
5271 | ||
5272 | /* Re-read these, now that we've installed the | |
5273 | `about_to_request_buffer_space' breakpoint/lock. A thread could | |
5274 | have finished a traceframe between the last read of these | |
5275 | counters and setting the breakpoint above. If we start | |
5276 | uploading, we never want to leave this function with | |
5277 | traceframe_read_count != 0, otherwise, GDBserver could end up | |
5278 | incrementing the counter tokens more than once (due to event loop | |
5279 | nesting), which would break the IP agent's "effective" detection | |
5280 | (see trace_alloc_trace_buffer). */ | |
5281 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, | |
5282 | &ipa_traceframe_read_count)) | |
5283 | return; | |
5284 | if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, | |
5285 | &ipa_traceframe_write_count)) | |
5286 | return; | |
5287 | ||
5288 | if (debug_threads) | |
5289 | { | |
5290 | trace_debug ("ipa_traceframe_count (blocked area): %d (w=%d, r=%d)", | |
5291 | ipa_traceframe_write_count - ipa_traceframe_read_count, | |
5292 | ipa_traceframe_write_count, ipa_traceframe_read_count); | |
5293 | ||
5294 | if (ipa_traceframe_write_count != ipa_traceframe_write_count_racy | |
5295 | || ipa_traceframe_read_count != ipa_traceframe_read_count_racy) | |
5296 | trace_debug ("note that ipa_traceframe_count's parts changed"); | |
5297 | } | |
5298 | ||
5299 | /* Get the address of the current TBC object (the IP agent has an | |
5300 | array of 3 such objects). The index is stored in the TBC | |
5301 | token. */ | |
5302 | ipa_trace_buffer_ctrl_addr = ipa_sym_addrs.addr_trace_buffer_ctrl; | |
5303 | ipa_trace_buffer_ctrl_addr | |
5304 | += sizeof (struct ipa_trace_buffer_control) * curr_tbctrl_idx; | |
5305 | ||
5306 | if (read_inferior_memory (ipa_trace_buffer_ctrl_addr, | |
5307 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
5308 | sizeof (struct ipa_trace_buffer_control))) | |
5309 | return; | |
5310 | ||
5311 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_lo, | |
5312 | &ipa_trace_buffer_lo)) | |
5313 | return; | |
5314 | if (read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_hi, | |
5315 | &ipa_trace_buffer_hi)) | |
5316 | return; | |
5317 | ||
5318 | /* Offsets are easier to grok for debugging than raw addresses, | |
5319 | especially for the small trace buffer sizes that are useful for | |
5320 | testing. */ | |
5321 | trace_debug ("Lib: Trace buffer [%d] start=%d free=%d " | |
5322 | "endfree=%d wrap=%d hi=%d", | |
5323 | curr_tbctrl_idx, | |
5324 | (int) (ipa_trace_buffer_ctrl.start - ipa_trace_buffer_lo), | |
5325 | (int) (ipa_trace_buffer_ctrl.free - ipa_trace_buffer_lo), | |
5326 | (int) (ipa_trace_buffer_ctrl.end_free - ipa_trace_buffer_lo), | |
5327 | (int) (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo), | |
5328 | (int) (ipa_trace_buffer_hi - ipa_trace_buffer_lo)); | |
5329 | ||
5330 | /* Note that the IPA's buffer is always circular. */ | |
5331 | ||
5332 | #define IPA_FIRST_TRACEFRAME() (ipa_trace_buffer_ctrl.start) | |
5333 | ||
5334 | #define IPA_NEXT_TRACEFRAME_1(TF, TFOBJ) \ | |
5335 | ((TF) + sizeof (struct traceframe) + (TFOBJ)->data_size) | |
5336 | ||
5337 | #define IPA_NEXT_TRACEFRAME(TF, TFOBJ) \ | |
5338 | (IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) \ | |
5339 | - ((IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) >= ipa_trace_buffer_ctrl.wrap) \ | |
5340 | ? (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo) \ | |
5341 | : 0)) | |
5342 | ||
5343 | tf = IPA_FIRST_TRACEFRAME (); | |
5344 | ||
5345 | while (ipa_traceframe_write_count - ipa_traceframe_read_count) | |
5346 | { | |
5347 | struct tracepoint *tpoint; | |
5348 | struct traceframe *tframe; | |
5349 | unsigned char *block; | |
5350 | struct traceframe ipa_tframe; | |
5351 | ||
5352 | if (read_inferior_memory (tf, (unsigned char *) &ipa_tframe, | |
5353 | offsetof (struct traceframe, data))) | |
5354 | error ("Uploading: couldn't read traceframe at %s\n", paddress (tf)); | |
5355 | ||
5356 | if (ipa_tframe.tpnum == 0) | |
5357 | fatal ("Uploading: No (more) fast traceframes, but " | |
5358 | "ipa_traceframe_count == %u??\n", | |
5359 | ipa_traceframe_write_count - ipa_traceframe_read_count); | |
5360 | ||
5361 | /* Note that this will be incorrect for multi-location | |
5362 | tracepoints... */ | |
5363 | tpoint = find_next_tracepoint_by_number (NULL, ipa_tframe.tpnum); | |
5364 | ||
5365 | tframe = add_traceframe (tpoint); | |
5366 | if (tframe == NULL) | |
5367 | { | |
5368 | trace_buffer_is_full = 1; | |
5369 | trace_debug ("Uploading: trace buffer is full"); | |
5370 | } | |
5371 | else | |
5372 | { | |
5373 | /* Copy the whole set of blocks in one go for now. FIXME: | |
5374 | split this in smaller blocks. */ | |
5375 | block = add_traceframe_block (tframe, ipa_tframe.data_size); | |
5376 | if (block != NULL) | |
5377 | { | |
5378 | if (read_inferior_memory (tf + offsetof (struct traceframe, data), | |
5379 | block, ipa_tframe.data_size)) | |
5380 | error ("Uploading: Couldn't read traceframe data at %s\n", | |
5381 | paddress (tf + offsetof (struct traceframe, data))); | |
5382 | } | |
5383 | ||
5384 | trace_debug ("Uploading: traceframe didn't fit"); | |
5385 | finish_traceframe (tframe); | |
5386 | } | |
5387 | ||
5388 | tf = IPA_NEXT_TRACEFRAME (tf, &ipa_tframe); | |
5389 | ||
5390 | /* If we freed the traceframe that wrapped around, go back | |
5391 | to the non-wrap case. */ | |
5392 | if (tf < ipa_trace_buffer_ctrl.start) | |
5393 | { | |
5394 | trace_debug ("Lib: Discarding past the wraparound"); | |
5395 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
5396 | } | |
5397 | ipa_trace_buffer_ctrl.start = tf; | |
5398 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_ctrl.start; | |
5399 | ++ipa_traceframe_read_count; | |
5400 | ||
5401 | if (ipa_trace_buffer_ctrl.start == ipa_trace_buffer_ctrl.free | |
5402 | && ipa_trace_buffer_ctrl.start == ipa_trace_buffer_ctrl.end_free) | |
5403 | { | |
5404 | trace_debug ("Lib: buffer is fully empty. " | |
5405 | "Trace buffer [%d] start=%d free=%d endfree=%d", | |
5406 | curr_tbctrl_idx, | |
5407 | (int) (ipa_trace_buffer_ctrl.start | |
5408 | - ipa_trace_buffer_lo), | |
5409 | (int) (ipa_trace_buffer_ctrl.free | |
5410 | - ipa_trace_buffer_lo), | |
5411 | (int) (ipa_trace_buffer_ctrl.end_free | |
5412 | - ipa_trace_buffer_lo)); | |
5413 | ||
5414 | ipa_trace_buffer_ctrl.start = ipa_trace_buffer_lo; | |
5415 | ipa_trace_buffer_ctrl.free = ipa_trace_buffer_lo; | |
5416 | ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_hi; | |
5417 | ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi; | |
5418 | } | |
5419 | ||
5420 | trace_debug ("Uploaded a traceframe\n" | |
5421 | "Lib: Trace buffer [%d] start=%d free=%d " | |
5422 | "endfree=%d wrap=%d hi=%d", | |
5423 | curr_tbctrl_idx, | |
5424 | (int) (ipa_trace_buffer_ctrl.start - ipa_trace_buffer_lo), | |
5425 | (int) (ipa_trace_buffer_ctrl.free - ipa_trace_buffer_lo), | |
5426 | (int) (ipa_trace_buffer_ctrl.end_free - ipa_trace_buffer_lo), | |
5427 | (int) (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo), | |
5428 | (int) (ipa_trace_buffer_hi - ipa_trace_buffer_lo)); | |
5429 | } | |
5430 | ||
5431 | if (write_inferior_memory (ipa_trace_buffer_ctrl_addr, | |
5432 | (unsigned char *) &ipa_trace_buffer_ctrl, | |
5433 | sizeof (struct ipa_trace_buffer_control))) | |
5434 | return; | |
5435 | ||
5436 | write_inferior_integer (ipa_sym_addrs.addr_traceframe_read_count, | |
5437 | ipa_traceframe_read_count); | |
5438 | ||
5439 | trace_debug ("Done uploading traceframes [%d]\n", curr_tbctrl_idx); | |
5440 | ||
5441 | pause_all (1); | |
5442 | cancel_breakpoints (); | |
5443 | ||
5444 | delete_breakpoint (about_to_request_buffer_space_bkpt); | |
5445 | about_to_request_buffer_space_bkpt = NULL; | |
5446 | ||
5447 | unpause_all (1); | |
5448 | ||
5449 | if (trace_buffer_is_full) | |
5450 | stop_tracing (); | |
5451 | } | |
5452 | #endif | |
5453 | ||
5454 | #ifdef IN_PROCESS_AGENT | |
5455 | ||
5456 | #include <sys/mman.h> | |
5457 | #include <fcntl.h> | |
5458 | ||
5459 | IP_AGENT_EXPORT char *gdb_tp_heap_buffer; | |
5460 | IP_AGENT_EXPORT char *gdb_jump_pad_buffer; | |
5461 | IP_AGENT_EXPORT char *gdb_jump_pad_buffer_end; | |
5462 | ||
5463 | static void __attribute__ ((constructor)) | |
5464 | initialize_tracepoint_ftlib (void) | |
5465 | { | |
5466 | initialize_tracepoint (); | |
5467 | } | |
5468 | ||
5469 | #endif | |
5470 | ||
219f2f23 PA |
5471 | static LONGEST |
5472 | tsv_get_timestamp (void) | |
5473 | { | |
5474 | struct timeval tv; | |
5475 | ||
5476 | if (gettimeofday (&tv, 0) != 0) | |
5477 | return -1; | |
5478 | else | |
5479 | return (LONGEST) tv.tv_sec * 1000000 + tv.tv_usec; | |
5480 | } | |
5481 | ||
5482 | void | |
5483 | initialize_tracepoint (void) | |
5484 | { | |
5485 | /* There currently no way to change the buffer size. */ | |
5486 | const int sizeOfBuffer = 5 * 1024 * 1024; | |
5487 | unsigned char *buf = xmalloc (sizeOfBuffer); | |
5488 | init_trace_buffer (buf, sizeOfBuffer); | |
5489 | ||
5490 | /* Wire trace state variable 1 to be the timestamp. This will be | |
5491 | uploaded to GDB upon connection and become one of its trace state | |
5492 | variables. (In case you're wondering, if GDB already has a trace | |
5493 | variable numbered 1, it will be renumbered.) */ | |
fa593d66 | 5494 | create_trace_state_variable (1, 0); |
219f2f23 PA |
5495 | set_trace_state_variable_name (1, "trace_timestamp"); |
5496 | set_trace_state_variable_getter (1, tsv_get_timestamp); | |
fa593d66 PA |
5497 | |
5498 | #ifdef IN_PROCESS_AGENT | |
5499 | { | |
5500 | int pagesize; | |
5501 | pagesize = sysconf (_SC_PAGE_SIZE); | |
5502 | if (pagesize == -1) | |
5503 | fatal ("sysconf"); | |
5504 | ||
5505 | gdb_tp_heap_buffer = xmalloc (5 * 1024 * 1024); | |
5506 | ||
5507 | /* Allocate scratch buffer aligned on a page boundary. */ | |
5508 | gdb_jump_pad_buffer = memalign (pagesize, pagesize * 20); | |
5509 | gdb_jump_pad_buffer_end = gdb_jump_pad_buffer + pagesize * 20; | |
5510 | ||
5511 | /* Make it writable and executable. */ | |
5512 | if (mprotect (gdb_jump_pad_buffer, pagesize * 20, | |
5513 | PROT_READ | PROT_WRITE | PROT_EXEC) != 0) | |
5514 | fatal ("\ | |
5515 | initialize_tracepoint: mprotect(%p, %d, PROT_READ|PROT_EXEC) failed with %s", | |
5516 | gdb_jump_pad_buffer, pagesize * 20, strerror (errno)); | |
5517 | } | |
5518 | ||
5519 | initialize_low_tracepoint (); | |
5520 | #endif | |
219f2f23 | 5521 | } |