| 1 | /* Internal interfaces for the GNU/Linux specific target code for gdbserver. |
| 2 | Copyright (C) 2002-2020 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 | #ifndef GDBSERVER_LINUX_LOW_H |
| 20 | #define GDBSERVER_LINUX_LOW_H |
| 21 | |
| 22 | #include "nat/linux-nat.h" |
| 23 | #include "nat/gdb_thread_db.h" |
| 24 | #include <signal.h> |
| 25 | |
| 26 | #include "gdbthread.h" |
| 27 | #include "gdb_proc_service.h" |
| 28 | |
| 29 | /* Included for ptrace type definitions. */ |
| 30 | #include "nat/linux-ptrace.h" |
| 31 | #include "target/waitstatus.h" /* For enum target_stop_reason. */ |
| 32 | #include "tracepoint.h" |
| 33 | |
| 34 | #define PTRACE_XFER_TYPE long |
| 35 | |
| 36 | #ifdef HAVE_LINUX_REGSETS |
| 37 | typedef void (*regset_fill_func) (struct regcache *, void *); |
| 38 | typedef void (*regset_store_func) (struct regcache *, const void *); |
| 39 | enum regset_type { |
| 40 | GENERAL_REGS, |
| 41 | FP_REGS, |
| 42 | EXTENDED_REGS, |
| 43 | OPTIONAL_REGS, /* Do not error if the regset cannot be accessed. */ |
| 44 | }; |
| 45 | |
| 46 | /* The arch's regsets array initializer must be terminated with a NULL |
| 47 | regset. */ |
| 48 | #define NULL_REGSET \ |
| 49 | { 0, 0, 0, -1, (enum regset_type) -1, NULL, NULL } |
| 50 | |
| 51 | struct regset_info |
| 52 | { |
| 53 | int get_request, set_request; |
| 54 | /* If NT_TYPE isn't 0, it will be passed to ptrace as the 3rd |
| 55 | argument and the 4th argument should be "const struct iovec *". */ |
| 56 | int nt_type; |
| 57 | int size; |
| 58 | enum regset_type type; |
| 59 | regset_fill_func fill_function; |
| 60 | regset_store_func store_function; |
| 61 | }; |
| 62 | |
| 63 | /* Aggregation of all the supported regsets of a given |
| 64 | architecture/mode. */ |
| 65 | |
| 66 | struct regsets_info |
| 67 | { |
| 68 | /* The regsets array. */ |
| 69 | struct regset_info *regsets; |
| 70 | |
| 71 | /* The number of regsets in the REGSETS array. */ |
| 72 | int num_regsets; |
| 73 | |
| 74 | /* If we get EIO on a regset, do not try it again. Note the set of |
| 75 | supported regsets may depend on processor mode on biarch |
| 76 | machines. This is a (lazily allocated) array holding one boolean |
| 77 | byte (0/1) per regset, with each element corresponding to the |
| 78 | regset in the REGSETS array above at the same offset. */ |
| 79 | char *disabled_regsets; |
| 80 | }; |
| 81 | |
| 82 | #endif |
| 83 | |
| 84 | /* Mapping between the general-purpose registers in `struct user' |
| 85 | format and GDB's register array layout. */ |
| 86 | |
| 87 | struct usrregs_info |
| 88 | { |
| 89 | /* The number of registers accessible. */ |
| 90 | int num_regs; |
| 91 | |
| 92 | /* The registers map. */ |
| 93 | int *regmap; |
| 94 | }; |
| 95 | |
| 96 | /* All info needed to access an architecture/mode's registers. */ |
| 97 | |
| 98 | struct regs_info |
| 99 | { |
| 100 | /* Regset support bitmap: 1 for registers that are transferred as a part |
| 101 | of a regset, 0 for ones that need to be handled individually. This |
| 102 | can be NULL if all registers are transferred with regsets or regsets |
| 103 | are not supported. */ |
| 104 | unsigned char *regset_bitmap; |
| 105 | |
| 106 | /* Info used when accessing registers with PTRACE_PEEKUSER / |
| 107 | PTRACE_POKEUSER. This can be NULL if all registers are |
| 108 | transferred with regsets .*/ |
| 109 | struct usrregs_info *usrregs; |
| 110 | |
| 111 | #ifdef HAVE_LINUX_REGSETS |
| 112 | /* Info used when accessing registers with regsets. */ |
| 113 | struct regsets_info *regsets_info; |
| 114 | #endif |
| 115 | }; |
| 116 | |
| 117 | struct process_info_private |
| 118 | { |
| 119 | /* Arch-specific additions. */ |
| 120 | struct arch_process_info *arch_private; |
| 121 | |
| 122 | /* libthread_db-specific additions. Not NULL if this process has loaded |
| 123 | thread_db, and it is active. */ |
| 124 | struct thread_db *thread_db; |
| 125 | |
| 126 | /* &_r_debug. 0 if not yet determined. -1 if no PT_DYNAMIC in Phdrs. */ |
| 127 | CORE_ADDR r_debug; |
| 128 | }; |
| 129 | |
| 130 | struct lwp_info; |
| 131 | |
| 132 | struct linux_target_ops |
| 133 | { |
| 134 | /* See target.h for details. */ |
| 135 | int (*breakpoint_kind_from_pc) (CORE_ADDR *pcptr); |
| 136 | |
| 137 | /* See target.h for details. */ |
| 138 | const gdb_byte *(*sw_breakpoint_from_kind) (int kind, int *size); |
| 139 | |
| 140 | /* Find the next possible PCs after the current instruction executes. */ |
| 141 | std::vector<CORE_ADDR> (*get_next_pcs) (struct regcache *regcache); |
| 142 | |
| 143 | int decr_pc_after_break; |
| 144 | int (*breakpoint_at) (CORE_ADDR pc); |
| 145 | |
| 146 | /* Breakpoint and watchpoint related functions. See target.h for |
| 147 | comments. */ |
| 148 | int (*supports_z_point_type) (char z_type); |
| 149 | int (*insert_point) (enum raw_bkpt_type type, CORE_ADDR addr, |
| 150 | int size, struct raw_breakpoint *bp); |
| 151 | int (*remove_point) (enum raw_bkpt_type type, CORE_ADDR addr, |
| 152 | int size, struct raw_breakpoint *bp); |
| 153 | |
| 154 | int (*stopped_by_watchpoint) (void); |
| 155 | CORE_ADDR (*stopped_data_address) (void); |
| 156 | |
| 157 | /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular |
| 158 | for registers smaller than an xfer unit). */ |
| 159 | void (*collect_ptrace_register) (struct regcache *regcache, |
| 160 | int regno, char *buf); |
| 161 | void (*supply_ptrace_register) (struct regcache *regcache, |
| 162 | int regno, const char *buf); |
| 163 | |
| 164 | /* Hook to convert from target format to ptrace format and back. |
| 165 | Returns true if any conversion was done; false otherwise. |
| 166 | If DIRECTION is 1, then copy from INF to NATIVE. |
| 167 | If DIRECTION is 0, copy from NATIVE to INF. */ |
| 168 | int (*siginfo_fixup) (siginfo_t *native, gdb_byte *inf, int direction); |
| 169 | |
| 170 | /* Hook to call when a new process is created or attached to. |
| 171 | If extra per-process architecture-specific data is needed, |
| 172 | allocate it here. */ |
| 173 | struct arch_process_info * (*new_process) (void); |
| 174 | |
| 175 | /* Hook to call when a process is being deleted. If extra per-process |
| 176 | architecture-specific data is needed, delete it here. */ |
| 177 | void (*delete_process) (struct arch_process_info *info); |
| 178 | |
| 179 | /* Hook to call when a new thread is detected. |
| 180 | If extra per-thread architecture-specific data is needed, |
| 181 | allocate it here. */ |
| 182 | void (*new_thread) (struct lwp_info *); |
| 183 | |
| 184 | /* Hook to call when a thread is being deleted. If extra per-thread |
| 185 | architecture-specific data is needed, delete it here. */ |
| 186 | void (*delete_thread) (struct arch_lwp_info *); |
| 187 | |
| 188 | /* Hook to call, if any, when a new fork is attached. */ |
| 189 | void (*new_fork) (struct process_info *parent, struct process_info *child); |
| 190 | |
| 191 | /* Hook to call prior to resuming a thread. */ |
| 192 | void (*prepare_to_resume) (struct lwp_info *); |
| 193 | |
| 194 | /* Hook to support target specific qSupported. */ |
| 195 | void (*process_qsupported) (char **, int count); |
| 196 | |
| 197 | /* Returns true if the low target supports tracepoints. */ |
| 198 | int (*supports_tracepoints) (void); |
| 199 | |
| 200 | /* Fill ADDRP with the thread area address of LWPID. Returns 0 on |
| 201 | success, -1 on failure. */ |
| 202 | int (*get_thread_area) (int lwpid, CORE_ADDR *addrp); |
| 203 | |
| 204 | /* Install a fast tracepoint jump pad. See target.h for |
| 205 | comments. */ |
| 206 | int (*install_fast_tracepoint_jump_pad) (CORE_ADDR tpoint, CORE_ADDR tpaddr, |
| 207 | CORE_ADDR collector, |
| 208 | CORE_ADDR lockaddr, |
| 209 | ULONGEST orig_size, |
| 210 | CORE_ADDR *jump_entry, |
| 211 | CORE_ADDR *trampoline, |
| 212 | ULONGEST *trampoline_size, |
| 213 | unsigned char *jjump_pad_insn, |
| 214 | ULONGEST *jjump_pad_insn_size, |
| 215 | CORE_ADDR *adjusted_insn_addr, |
| 216 | CORE_ADDR *adjusted_insn_addr_end, |
| 217 | char *err); |
| 218 | |
| 219 | /* Return the bytecode operations vector for the current inferior. |
| 220 | Returns NULL if bytecode compilation is not supported. */ |
| 221 | struct emit_ops *(*emit_ops) (void); |
| 222 | |
| 223 | /* Return the minimum length of an instruction that can be safely overwritten |
| 224 | for use as a fast tracepoint. */ |
| 225 | int (*get_min_fast_tracepoint_insn_len) (void); |
| 226 | |
| 227 | /* Returns true if the low target supports range stepping. */ |
| 228 | int (*supports_range_stepping) (void); |
| 229 | |
| 230 | /* See target.h. */ |
| 231 | int (*breakpoint_kind_from_current_state) (CORE_ADDR *pcptr); |
| 232 | |
| 233 | /* See target.h. */ |
| 234 | int (*supports_hardware_single_step) (void); |
| 235 | |
| 236 | /* Fill *SYSNO with the syscall nr trapped. Only to be called when |
| 237 | inferior is stopped due to SYSCALL_SIGTRAP. */ |
| 238 | void (*get_syscall_trapinfo) (struct regcache *regcache, int *sysno); |
| 239 | |
| 240 | /* See target.h. */ |
| 241 | int (*get_ipa_tdesc_idx) (void); |
| 242 | }; |
| 243 | |
| 244 | extern struct linux_target_ops the_low_target; |
| 245 | |
| 246 | /* Target ops definitions for a Linux target. */ |
| 247 | |
| 248 | class linux_process_target : public process_stratum_target |
| 249 | { |
| 250 | public: |
| 251 | |
| 252 | int create_inferior (const char *program, |
| 253 | const std::vector<char *> &program_args) override; |
| 254 | |
| 255 | void post_create_inferior () override; |
| 256 | |
| 257 | int attach (unsigned long pid) override; |
| 258 | |
| 259 | int kill (process_info *proc) override; |
| 260 | |
| 261 | int detach (process_info *proc) override; |
| 262 | |
| 263 | void mourn (process_info *proc) override; |
| 264 | |
| 265 | void join (int pid) override; |
| 266 | |
| 267 | bool thread_alive (ptid_t pid) override; |
| 268 | |
| 269 | void resume (thread_resume *resume_info, size_t n) override; |
| 270 | |
| 271 | ptid_t wait (ptid_t ptid, target_waitstatus *status, |
| 272 | int options) override; |
| 273 | |
| 274 | void fetch_registers (regcache *regcache, int regno) override; |
| 275 | |
| 276 | void store_registers (regcache *regcache, int regno) override; |
| 277 | |
| 278 | int prepare_to_access_memory () override; |
| 279 | |
| 280 | void done_accessing_memory () override; |
| 281 | |
| 282 | int read_memory (CORE_ADDR memaddr, unsigned char *myaddr, |
| 283 | int len) override; |
| 284 | |
| 285 | int write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, |
| 286 | int len) override; |
| 287 | |
| 288 | void look_up_symbols () override; |
| 289 | |
| 290 | void request_interrupt () override; |
| 291 | |
| 292 | bool supports_read_auxv () override; |
| 293 | |
| 294 | int read_auxv (CORE_ADDR offset, unsigned char *myaddr, |
| 295 | unsigned int len) override; |
| 296 | |
| 297 | bool supports_z_point_type (char z_type) override; |
| 298 | |
| 299 | int insert_point (enum raw_bkpt_type type, CORE_ADDR addr, |
| 300 | int size, raw_breakpoint *bp) override; |
| 301 | |
| 302 | int remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
| 303 | int size, raw_breakpoint *bp) override; |
| 304 | |
| 305 | bool stopped_by_sw_breakpoint () override; |
| 306 | |
| 307 | bool supports_stopped_by_sw_breakpoint () override; |
| 308 | |
| 309 | bool stopped_by_hw_breakpoint () override; |
| 310 | |
| 311 | bool supports_stopped_by_hw_breakpoint () override; |
| 312 | |
| 313 | bool supports_hardware_single_step () override; |
| 314 | |
| 315 | bool stopped_by_watchpoint () override; |
| 316 | |
| 317 | CORE_ADDR stopped_data_address () override; |
| 318 | |
| 319 | bool supports_read_offsets () override; |
| 320 | |
| 321 | int read_offsets (CORE_ADDR *text, CORE_ADDR *data) override; |
| 322 | |
| 323 | bool supports_get_tls_address () override; |
| 324 | |
| 325 | int get_tls_address (thread_info *thread, CORE_ADDR offset, |
| 326 | CORE_ADDR load_module, CORE_ADDR *address) override; |
| 327 | |
| 328 | bool supports_qxfer_osdata () override; |
| 329 | |
| 330 | int qxfer_osdata (const char *annex, unsigned char *readbuf, |
| 331 | unsigned const char *writebuf, |
| 332 | CORE_ADDR offset, int len) override; |
| 333 | |
| 334 | bool supports_qxfer_siginfo () override; |
| 335 | |
| 336 | int qxfer_siginfo (const char *annex, unsigned char *readbuf, |
| 337 | unsigned const char *writebuf, |
| 338 | CORE_ADDR offset, int len) override; |
| 339 | |
| 340 | bool supports_non_stop () override; |
| 341 | |
| 342 | bool async (bool enable) override; |
| 343 | |
| 344 | int start_non_stop (bool enable) override; |
| 345 | |
| 346 | bool supports_multi_process () override; |
| 347 | |
| 348 | bool supports_fork_events () override; |
| 349 | |
| 350 | bool supports_vfork_events () override; |
| 351 | |
| 352 | bool supports_exec_events () override; |
| 353 | |
| 354 | void handle_new_gdb_connection () override; |
| 355 | |
| 356 | int handle_monitor_command (char *mon) override; |
| 357 | |
| 358 | int core_of_thread (ptid_t ptid) override; |
| 359 | |
| 360 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
| 361 | bool supports_read_loadmap () override; |
| 362 | |
| 363 | int read_loadmap (const char *annex, CORE_ADDR offset, |
| 364 | unsigned char *myaddr, unsigned int len) override; |
| 365 | #endif |
| 366 | |
| 367 | void process_qsupported (char **features, int count) override; |
| 368 | |
| 369 | bool supports_tracepoints () override; |
| 370 | |
| 371 | CORE_ADDR read_pc (regcache *regcache) override; |
| 372 | |
| 373 | void write_pc (regcache *regcache, CORE_ADDR pc) override; |
| 374 | |
| 375 | bool supports_thread_stopped () override; |
| 376 | |
| 377 | bool thread_stopped (thread_info *thread) override; |
| 378 | |
| 379 | void pause_all (bool freeze) override; |
| 380 | |
| 381 | void unpause_all (bool unfreeze) override; |
| 382 | |
| 383 | void stabilize_threads () override; |
| 384 | |
| 385 | bool supports_fast_tracepoints () override; |
| 386 | |
| 387 | int install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, |
| 388 | CORE_ADDR tpaddr, |
| 389 | CORE_ADDR collector, |
| 390 | CORE_ADDR lockaddr, |
| 391 | ULONGEST orig_size, |
| 392 | CORE_ADDR *jump_entry, |
| 393 | CORE_ADDR *trampoline, |
| 394 | ULONGEST *trampoline_size, |
| 395 | unsigned char *jjump_pad_insn, |
| 396 | ULONGEST *jjump_pad_insn_size, |
| 397 | CORE_ADDR *adjusted_insn_addr, |
| 398 | CORE_ADDR *adjusted_insn_addr_end, |
| 399 | char *err) override; |
| 400 | |
| 401 | int get_min_fast_tracepoint_insn_len () override; |
| 402 | |
| 403 | struct emit_ops *emit_ops () override; |
| 404 | |
| 405 | bool supports_disable_randomization () override; |
| 406 | |
| 407 | bool supports_qxfer_libraries_svr4 () override; |
| 408 | |
| 409 | int qxfer_libraries_svr4 (const char *annex, |
| 410 | unsigned char *readbuf, |
| 411 | unsigned const char *writebuf, |
| 412 | CORE_ADDR offset, int len) override; |
| 413 | |
| 414 | bool supports_agent () override; |
| 415 | |
| 416 | #ifdef HAVE_LINUX_BTRACE |
| 417 | btrace_target_info *enable_btrace (ptid_t ptid, |
| 418 | const btrace_config *conf) override; |
| 419 | |
| 420 | int disable_btrace (btrace_target_info *tinfo) override; |
| 421 | |
| 422 | int read_btrace (btrace_target_info *tinfo, buffer *buf, |
| 423 | enum btrace_read_type type) override; |
| 424 | |
| 425 | int read_btrace_conf (const btrace_target_info *tinfo, |
| 426 | buffer *buf) override; |
| 427 | #endif |
| 428 | |
| 429 | bool supports_range_stepping () override; |
| 430 | |
| 431 | bool supports_pid_to_exec_file () override; |
| 432 | |
| 433 | char *pid_to_exec_file (int pid) override; |
| 434 | |
| 435 | bool supports_multifs () override; |
| 436 | |
| 437 | int multifs_open (int pid, const char *filename, int flags, |
| 438 | mode_t mode) override; |
| 439 | |
| 440 | int multifs_unlink (int pid, const char *filename) override; |
| 441 | |
| 442 | ssize_t multifs_readlink (int pid, const char *filename, char *buf, |
| 443 | size_t bufsiz) override; |
| 444 | |
| 445 | int breakpoint_kind_from_pc (CORE_ADDR *pcptr) override; |
| 446 | |
| 447 | const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override; |
| 448 | |
| 449 | int breakpoint_kind_from_current_state (CORE_ADDR *pcptr) override; |
| 450 | |
| 451 | const char *thread_name (ptid_t thread) override; |
| 452 | |
| 453 | #if USE_THREAD_DB |
| 454 | bool thread_handle (ptid_t ptid, gdb_byte **handle, |
| 455 | int *handle_len) override; |
| 456 | #endif |
| 457 | |
| 458 | bool supports_software_single_step () override; |
| 459 | |
| 460 | bool supports_catch_syscall () override; |
| 461 | |
| 462 | int get_ipa_tdesc_idx () override; |
| 463 | |
| 464 | /* Return the information to access registers. This has public |
| 465 | visibility because proc-service uses it. */ |
| 466 | virtual const regs_info *get_regs_info () = 0; |
| 467 | |
| 468 | private: |
| 469 | |
| 470 | /* Handle a GNU/Linux extended wait response. If we see a clone, |
| 471 | fork, or vfork event, we need to add the new LWP to our list |
| 472 | (and return 0 so as not to report the trap to higher layers). |
| 473 | If we see an exec event, we will modify ORIG_EVENT_LWP to point |
| 474 | to a new LWP representing the new program. */ |
| 475 | int handle_extended_wait (lwp_info **orig_event_lwp, int wstat); |
| 476 | |
| 477 | /* Do low-level handling of the event, and check if we should go on |
| 478 | and pass it to caller code. Return the affected lwp if we are, or |
| 479 | NULL otherwise. */ |
| 480 | lwp_info *filter_event (int lwpid, int wstat); |
| 481 | |
| 482 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
| 483 | match FILTER_PTID (leaving others pending). The PTIDs can be: |
| 484 | minus_one_ptid, to specify any child; a pid PTID, specifying all |
| 485 | lwps of a thread group; or a PTID representing a single lwp. Store |
| 486 | the stop status through the status pointer WSTAT. OPTIONS is |
| 487 | passed to the waitpid call. Return 0 if no event was found and |
| 488 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children |
| 489 | was found. Return the PID of the stopped child otherwise. */ |
| 490 | int wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
| 491 | int *wstatp, int options); |
| 492 | |
| 493 | /* Wait for an event from child(ren) PTID. PTIDs can be: |
| 494 | minus_one_ptid, to specify any child; a pid PTID, specifying all |
| 495 | lwps of a thread group; or a PTID representing a single lwp. Store |
| 496 | the stop status through the status pointer WSTAT. OPTIONS is |
| 497 | passed to the waitpid call. Return 0 if no event was found and |
| 498 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children |
| 499 | was found. Return the PID of the stopped child otherwise. */ |
| 500 | int wait_for_event (ptid_t ptid, int *wstatp, int options); |
| 501 | |
| 502 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
| 503 | void wait_for_sigstop (); |
| 504 | |
| 505 | /* Wait for process, returns status. */ |
| 506 | ptid_t wait_1 (ptid_t ptid, target_waitstatus *ourstatus, |
| 507 | int target_options); |
| 508 | |
| 509 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
| 510 | If SUSPEND, then also increase the suspend count of every LWP, |
| 511 | except EXCEPT. */ |
| 512 | void stop_all_lwps (int suspend, lwp_info *except); |
| 513 | |
| 514 | /* Stopped LWPs that the client wanted to be running, that don't have |
| 515 | pending statuses, are set to run again, except for EXCEPT, if not |
| 516 | NULL. This undoes a stop_all_lwps call. */ |
| 517 | void unstop_all_lwps (int unsuspend, lwp_info *except); |
| 518 | |
| 519 | /* Start a step-over operation on LWP. When LWP stopped at a |
| 520 | breakpoint, to make progress, we need to remove the breakpoint out |
| 521 | of the way. If we let other threads run while we do that, they may |
| 522 | pass by the breakpoint location and miss hitting it. To avoid |
| 523 | that, a step-over momentarily stops all threads while LWP is |
| 524 | single-stepped by either hardware or software while the breakpoint |
| 525 | is temporarily uninserted from the inferior. When the single-step |
| 526 | finishes, we reinsert the breakpoint, and let all threads that are |
| 527 | supposed to be running, run again. */ |
| 528 | void start_step_over (lwp_info *lwp); |
| 529 | |
| 530 | /* If there's a step over in progress, wait until all threads stop |
| 531 | (that is, until the stepping thread finishes its step), and |
| 532 | unsuspend all lwps. The stepping thread ends with its status |
| 533 | pending, which is processed later when we get back to processing |
| 534 | events. */ |
| 535 | void complete_ongoing_step_over (); |
| 536 | |
| 537 | /* When we finish a step-over, set threads running again. If there's |
| 538 | another thread that may need a step-over, now's the time to start |
| 539 | it. Eventually, we'll move all threads past their breakpoints. */ |
| 540 | void proceed_all_lwps (); |
| 541 | |
| 542 | /* The reason we resume in the caller, is because we want to be able |
| 543 | to pass lwp->status_pending as WSTAT, and we need to clear |
| 544 | status_pending_p before resuming, otherwise, resume_one_lwp |
| 545 | refuses to resume. */ |
| 546 | bool maybe_move_out_of_jump_pad (lwp_info *lwp, int *wstat); |
| 547 | |
| 548 | /* Move THREAD out of the jump pad. */ |
| 549 | void move_out_of_jump_pad (thread_info *thread); |
| 550 | |
| 551 | /* Call low_arch_setup on THREAD. */ |
| 552 | void arch_setup_thread (thread_info *thread); |
| 553 | |
| 554 | #ifdef HAVE_LINUX_USRREGS |
| 555 | /* Fetch one register. */ |
| 556 | void fetch_register (const usrregs_info *usrregs, regcache *regcache, |
| 557 | int regno); |
| 558 | |
| 559 | /* Store one register. */ |
| 560 | void store_register (const usrregs_info *usrregs, regcache *regcache, |
| 561 | int regno); |
| 562 | #endif |
| 563 | |
| 564 | /* Fetch all registers, or just one, from the child process. |
| 565 | If REGNO is -1, do this for all registers, skipping any that are |
| 566 | assumed to have been retrieved by regsets_fetch_inferior_registers, |
| 567 | unless ALL is non-zero. |
| 568 | Otherwise, REGNO specifies which register (so we can save time). */ |
| 569 | void usr_fetch_inferior_registers (const regs_info *regs_info, |
| 570 | regcache *regcache, int regno, int all); |
| 571 | |
| 572 | /* Store our register values back into the inferior. |
| 573 | If REGNO is -1, do this for all registers, skipping any that are |
| 574 | assumed to have been saved by regsets_store_inferior_registers, |
| 575 | unless ALL is non-zero. |
| 576 | Otherwise, REGNO specifies which register (so we can save time). */ |
| 577 | void usr_store_inferior_registers (const regs_info *regs_info, |
| 578 | regcache *regcache, int regno, int all); |
| 579 | |
| 580 | /* Return the PC as read from the regcache of LWP, without any |
| 581 | adjustment. */ |
| 582 | CORE_ADDR get_pc (lwp_info *lwp); |
| 583 | |
| 584 | /* Called when the LWP stopped for a signal/trap. If it stopped for a |
| 585 | trap check what caused it (breakpoint, watchpoint, trace, etc.), |
| 586 | and save the result in the LWP's stop_reason field. If it stopped |
| 587 | for a breakpoint, decrement the PC if necessary on the lwp's |
| 588 | architecture. Returns true if we now have the LWP's stop PC. */ |
| 589 | bool save_stop_reason (lwp_info *lwp); |
| 590 | |
| 591 | /* Resume execution of LWP. If STEP is nonzero, single-step it. If |
| 592 | SIGNAL is nonzero, give it that signal. */ |
| 593 | void resume_one_lwp_throw (lwp_info *lwp, int step, int signal, |
| 594 | siginfo_t *info); |
| 595 | |
| 596 | /* Like resume_one_lwp_throw, but no error is thrown if the LWP |
| 597 | disappears while we try to resume it. */ |
| 598 | void resume_one_lwp (lwp_info *lwp, int step, int signal, siginfo_t *info); |
| 599 | |
| 600 | /* This function is called once per thread. We check the thread's |
| 601 | last resume request, which will tell us whether to resume, step, or |
| 602 | leave the thread stopped. Any signal the client requested to be |
| 603 | delivered has already been enqueued at this point. |
| 604 | |
| 605 | If any thread that GDB wants running is stopped at an internal |
| 606 | breakpoint that needs stepping over, we start a step-over operation |
| 607 | on that particular thread, and leave all others stopped. */ |
| 608 | void proceed_one_lwp (thread_info *thread, lwp_info *except); |
| 609 | |
| 610 | /* This function is called once per thread. We check the thread's |
| 611 | resume request, which will tell us whether to resume, step, or |
| 612 | leave the thread stopped; and what signal, if any, it should be |
| 613 | sent. |
| 614 | |
| 615 | For threads which we aren't explicitly told otherwise, we preserve |
| 616 | the stepping flag; this is used for stepping over gdbserver-placed |
| 617 | breakpoints. |
| 618 | |
| 619 | If pending_flags was set in any thread, we queue any needed |
| 620 | signals, since we won't actually resume. We already have a pending |
| 621 | event to report, so we don't need to preserve any step requests; |
| 622 | they should be re-issued if necessary. */ |
| 623 | void resume_one_thread (thread_info *thread, bool leave_all_stopped); |
| 624 | |
| 625 | /* Return true if this lwp has an interesting status pending. */ |
| 626 | bool status_pending_p_callback (thread_info *thread, ptid_t ptid); |
| 627 | |
| 628 | /* Resume LWPs that are currently stopped without any pending status |
| 629 | to report, but are resumed from the core's perspective. */ |
| 630 | void resume_stopped_resumed_lwps (thread_info *thread); |
| 631 | |
| 632 | /* Unsuspend THREAD, except EXCEPT, and proceed. */ |
| 633 | void unsuspend_and_proceed_one_lwp (thread_info *thread, lwp_info *except); |
| 634 | |
| 635 | /* Return true if this lwp still has an interesting status pending. |
| 636 | If not (e.g., it had stopped for a breakpoint that is gone), return |
| 637 | false. */ |
| 638 | bool thread_still_has_status_pending (thread_info *thread); |
| 639 | |
| 640 | /* Return true if this lwp is to-be-resumed and has an interesting |
| 641 | status pending. */ |
| 642 | bool resume_status_pending (thread_info *thread); |
| 643 | |
| 644 | /* Return true if this lwp that GDB wants running is stopped at an |
| 645 | internal breakpoint that we need to step over. It assumes that |
| 646 | any required STOP_PC adjustment has already been propagated to |
| 647 | the inferior's regcache. */ |
| 648 | bool thread_needs_step_over (thread_info *thread); |
| 649 | |
| 650 | /* Single step via hardware or software single step. |
| 651 | Return 1 if hardware single stepping, 0 if software single stepping |
| 652 | or can't single step. */ |
| 653 | int single_step (lwp_info* lwp); |
| 654 | |
| 655 | /* Install breakpoints for software single stepping. */ |
| 656 | void install_software_single_step_breakpoints (lwp_info *lwp); |
| 657 | |
| 658 | protected: |
| 659 | /* The architecture-specific "low" methods are listed below. */ |
| 660 | |
| 661 | /* Architecture-specific setup for the current thread. */ |
| 662 | virtual void low_arch_setup () = 0; |
| 663 | |
| 664 | /* Return false if we can fetch/store the register, true if we cannot |
| 665 | fetch/store the register. */ |
| 666 | virtual bool low_cannot_fetch_register (int regno) = 0; |
| 667 | |
| 668 | virtual bool low_cannot_store_register (int regno) = 0; |
| 669 | |
| 670 | /* Hook to fetch a register in some non-standard way. Used for |
| 671 | example by backends that have read-only registers with hardcoded |
| 672 | values (e.g., IA64's gr0/fr0/fr1). Returns true if register |
| 673 | REGNO was supplied, false if not, and we should fallback to the |
| 674 | standard ptrace methods. */ |
| 675 | virtual bool low_fetch_register (regcache *regcache, int regno); |
| 676 | |
| 677 | /* Return true if breakpoints are supported. Such targets must |
| 678 | implement the GET_PC and SET_PC methods. */ |
| 679 | virtual bool low_supports_breakpoints (); |
| 680 | |
| 681 | virtual CORE_ADDR low_get_pc (regcache *regcache); |
| 682 | |
| 683 | virtual void low_set_pc (regcache *regcache, CORE_ADDR newpc); |
| 684 | }; |
| 685 | |
| 686 | extern linux_process_target *the_linux_target; |
| 687 | |
| 688 | #define get_thread_lwp(thr) ((struct lwp_info *) (thread_target_data (thr))) |
| 689 | #define get_lwp_thread(lwp) ((lwp)->thread) |
| 690 | |
| 691 | /* This struct is recorded in the target_data field of struct thread_info. |
| 692 | |
| 693 | On linux ``all_threads'' is keyed by the LWP ID, which we use as the |
| 694 | GDB protocol representation of the thread ID. Threads also have |
| 695 | a "process ID" (poorly named) which is (presently) the same as the |
| 696 | LWP ID. |
| 697 | |
| 698 | There is also ``all_processes'' is keyed by the "overall process ID", |
| 699 | which GNU/Linux calls tgid, "thread group ID". */ |
| 700 | |
| 701 | struct lwp_info |
| 702 | { |
| 703 | /* Backlink to the parent object. */ |
| 704 | struct thread_info *thread; |
| 705 | |
| 706 | /* If this flag is set, the next SIGSTOP will be ignored (the |
| 707 | process will be immediately resumed). This means that either we |
| 708 | sent the SIGSTOP to it ourselves and got some other pending event |
| 709 | (so the SIGSTOP is still pending), or that we stopped the |
| 710 | inferior implicitly via PTRACE_ATTACH and have not waited for it |
| 711 | yet. */ |
| 712 | int stop_expected; |
| 713 | |
| 714 | /* When this is true, we shall not try to resume this thread, even |
| 715 | if last_resume_kind isn't resume_stop. */ |
| 716 | int suspended; |
| 717 | |
| 718 | /* If this flag is set, the lwp is known to be stopped right now (stop |
| 719 | event already received in a wait()). */ |
| 720 | int stopped; |
| 721 | |
| 722 | /* Signal whether we are in a SYSCALL_ENTRY or |
| 723 | in a SYSCALL_RETURN event. |
| 724 | Values: |
| 725 | - TARGET_WAITKIND_SYSCALL_ENTRY |
| 726 | - TARGET_WAITKIND_SYSCALL_RETURN */ |
| 727 | enum target_waitkind syscall_state; |
| 728 | |
| 729 | /* When stopped is set, the last wait status recorded for this lwp. */ |
| 730 | int last_status; |
| 731 | |
| 732 | /* If WAITSTATUS->KIND != TARGET_WAITKIND_IGNORE, the waitstatus for |
| 733 | this LWP's last event, to pass to GDB without any further |
| 734 | processing. This is used to store extended ptrace event |
| 735 | information or exit status until it can be reported to GDB. */ |
| 736 | struct target_waitstatus waitstatus; |
| 737 | |
| 738 | /* A pointer to the fork child/parent relative. Valid only while |
| 739 | the parent fork event is not reported to higher layers. Used to |
| 740 | avoid wildcard vCont actions resuming a fork child before GDB is |
| 741 | notified about the parent's fork event. */ |
| 742 | struct lwp_info *fork_relative; |
| 743 | |
| 744 | /* When stopped is set, this is where the lwp last stopped, with |
| 745 | decr_pc_after_break already accounted for. If the LWP is |
| 746 | running, this is the address at which the lwp was resumed. */ |
| 747 | CORE_ADDR stop_pc; |
| 748 | |
| 749 | /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet |
| 750 | been reported. */ |
| 751 | int status_pending_p; |
| 752 | int status_pending; |
| 753 | |
| 754 | /* The reason the LWP last stopped, if we need to track it |
| 755 | (breakpoint, watchpoint, etc.) */ |
| 756 | enum target_stop_reason stop_reason; |
| 757 | |
| 758 | /* On architectures where it is possible to know the data address of |
| 759 | a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and |
| 760 | contains such data address. Only valid if STOPPED_BY_WATCHPOINT |
| 761 | is true. */ |
| 762 | CORE_ADDR stopped_data_address; |
| 763 | |
| 764 | /* If this is non-zero, it is a breakpoint to be reinserted at our next |
| 765 | stop (SIGTRAP stops only). */ |
| 766 | CORE_ADDR bp_reinsert; |
| 767 | |
| 768 | /* If this flag is set, the last continue operation at the ptrace |
| 769 | level on this process was a single-step. */ |
| 770 | int stepping; |
| 771 | |
| 772 | /* Range to single step within. This is a copy of the step range |
| 773 | passed along the last resume request. See 'struct |
| 774 | thread_resume'. */ |
| 775 | CORE_ADDR step_range_start; /* Inclusive */ |
| 776 | CORE_ADDR step_range_end; /* Exclusive */ |
| 777 | |
| 778 | /* If this flag is set, we need to set the event request flags the |
| 779 | next time we see this LWP stop. */ |
| 780 | int must_set_ptrace_flags; |
| 781 | |
| 782 | /* If this is non-zero, it points to a chain of signals which need to |
| 783 | be delivered to this process. */ |
| 784 | struct pending_signals *pending_signals; |
| 785 | |
| 786 | /* A link used when resuming. It is initialized from the resume request, |
| 787 | and then processed and cleared in linux_resume_one_lwp. */ |
| 788 | struct thread_resume *resume; |
| 789 | |
| 790 | /* Information bout this lwp's fast tracepoint collection status (is it |
| 791 | currently stopped in the jump pad, and if so, before or at/after the |
| 792 | relocated instruction). Normally, we won't care about this, but we will |
| 793 | if a signal arrives to this lwp while it is collecting. */ |
| 794 | fast_tpoint_collect_result collecting_fast_tracepoint; |
| 795 | |
| 796 | /* If this is non-zero, it points to a chain of signals which need |
| 797 | to be reported to GDB. These were deferred because the thread |
| 798 | was doing a fast tracepoint collect when they arrived. */ |
| 799 | struct pending_signals *pending_signals_to_report; |
| 800 | |
| 801 | /* When collecting_fast_tracepoint is first found to be 1, we insert |
| 802 | a exit-jump-pad-quickly breakpoint. This is it. */ |
| 803 | struct breakpoint *exit_jump_pad_bkpt; |
| 804 | |
| 805 | #ifdef USE_THREAD_DB |
| 806 | int thread_known; |
| 807 | /* The thread handle, used for e.g. TLS access. Only valid if |
| 808 | THREAD_KNOWN is set. */ |
| 809 | td_thrhandle_t th; |
| 810 | |
| 811 | /* The pthread_t handle. */ |
| 812 | thread_t thread_handle; |
| 813 | #endif |
| 814 | |
| 815 | /* Arch-specific additions. */ |
| 816 | struct arch_lwp_info *arch_private; |
| 817 | }; |
| 818 | |
| 819 | int linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine); |
| 820 | |
| 821 | /* Attach to PTID. Returns 0 on success, non-zero otherwise (an |
| 822 | errno). */ |
| 823 | int linux_attach_lwp (ptid_t ptid); |
| 824 | |
| 825 | struct lwp_info *find_lwp_pid (ptid_t ptid); |
| 826 | /* For linux_stop_lwp see nat/linux-nat.h. */ |
| 827 | |
| 828 | #ifdef HAVE_LINUX_REGSETS |
| 829 | void initialize_regsets_info (struct regsets_info *regsets_info); |
| 830 | #endif |
| 831 | |
| 832 | void initialize_low_arch (void); |
| 833 | |
| 834 | void linux_set_pc_32bit (struct regcache *regcache, CORE_ADDR pc); |
| 835 | CORE_ADDR linux_get_pc_32bit (struct regcache *regcache); |
| 836 | |
| 837 | void linux_set_pc_64bit (struct regcache *regcache, CORE_ADDR pc); |
| 838 | CORE_ADDR linux_get_pc_64bit (struct regcache *regcache); |
| 839 | |
| 840 | /* From thread-db.c */ |
| 841 | int thread_db_init (void); |
| 842 | void thread_db_detach (struct process_info *); |
| 843 | void thread_db_mourn (struct process_info *); |
| 844 | int thread_db_handle_monitor_command (char *); |
| 845 | int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset, |
| 846 | CORE_ADDR load_module, CORE_ADDR *address); |
| 847 | int thread_db_look_up_one_symbol (const char *name, CORE_ADDR *addrp); |
| 848 | |
| 849 | /* Called from linux-low.c when a clone event is detected. Upon entry, |
| 850 | both the clone and the parent should be stopped. This function does |
| 851 | whatever is required have the clone under thread_db's control. */ |
| 852 | |
| 853 | void thread_db_notice_clone (struct thread_info *parent_thr, ptid_t child_ptid); |
| 854 | |
| 855 | bool thread_db_thread_handle (ptid_t ptid, gdb_byte **handle, int *handle_len); |
| 856 | |
| 857 | extern int have_ptrace_getregset; |
| 858 | |
| 859 | /* Search for the value with type MATCH in the auxv vector with |
| 860 | entries of length WORDSIZE bytes. If found, store the value in |
| 861 | *VALP and return 1. If not found or if there is an error, return |
| 862 | 0. */ |
| 863 | |
| 864 | int linux_get_auxv (int wordsize, CORE_ADDR match, |
| 865 | CORE_ADDR *valp); |
| 866 | |
| 867 | /* Fetch the AT_HWCAP entry from the auxv vector, where entries are length |
| 868 | WORDSIZE. If no entry was found, return zero. */ |
| 869 | |
| 870 | CORE_ADDR linux_get_hwcap (int wordsize); |
| 871 | |
| 872 | /* Fetch the AT_HWCAP2 entry from the auxv vector, where entries are length |
| 873 | WORDSIZE. If no entry was found, return zero. */ |
| 874 | |
| 875 | CORE_ADDR linux_get_hwcap2 (int wordsize); |
| 876 | |
| 877 | #endif /* GDBSERVER_LINUX_LOW_H */ |