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