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