1 /* Internal interfaces for the GNU/Linux specific target code for gdbserver.
2 Copyright (C) 2002-2020 Free Software Foundation, Inc.
4 This file is part of GDB.
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.
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.
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/>. */
19 #ifndef GDBSERVER_LINUX_LOW_H
20 #define GDBSERVER_LINUX_LOW_H
22 #include "nat/linux-nat.h"
23 #include "nat/gdb_thread_db.h"
26 #include "gdbthread.h"
27 #include "gdb_proc_service.h"
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"
34 #define PTRACE_XFER_TYPE long
36 #ifdef HAVE_LINUX_REGSETS
37 typedef void (*regset_fill_func
) (struct regcache
*, void *);
38 typedef void (*regset_store_func
) (struct regcache
*, const void *);
43 OPTIONAL_REGS
, /* Do not error if the regset cannot be accessed. */
46 /* The arch's regsets array initializer must be terminated with a NULL
49 { 0, 0, 0, -1, (enum regset_type) -1, NULL, NULL }
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 *". */
58 enum regset_type type
;
59 regset_fill_func fill_function
;
60 regset_store_func store_function
;
63 /* Aggregation of all the supported regsets of a given
68 /* The regsets array. */
69 struct regset_info
*regsets
;
71 /* The number of regsets in the REGSETS array. */
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
;
84 /* Mapping between the general-purpose registers in `struct user'
85 format and GDB's register array layout. */
89 /* The number of registers accessible. */
92 /* The registers map. */
96 /* All info needed to access an architecture/mode's registers. */
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
;
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
;
111 #ifdef HAVE_LINUX_REGSETS
112 /* Info used when accessing registers with regsets. */
113 struct regsets_info
*regsets_info
;
117 struct process_info_private
119 /* Arch-specific additions. */
120 struct arch_process_info
*arch_private
;
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
;
126 /* &_r_debug. 0 if not yet determined. -1 if no PT_DYNAMIC in Phdrs. */
132 struct linux_target_ops
134 /* Return the bytecode operations vector for the current inferior.
135 Returns NULL if bytecode compilation is not supported. */
136 struct emit_ops
*(*emit_ops
) (void);
138 /* Returns true if the low target supports range stepping. */
139 int (*supports_range_stepping
) (void);
142 int (*supports_hardware_single_step
) (void);
144 /* Fill *SYSNO with the syscall nr trapped. Only to be called when
145 inferior is stopped due to SYSCALL_SIGTRAP. */
146 void (*get_syscall_trapinfo
) (struct regcache
*regcache
, int *sysno
);
149 int (*get_ipa_tdesc_idx
) (void);
152 extern struct linux_target_ops the_low_target
;
154 /* Target ops definitions for a Linux target. */
156 class linux_process_target
: public process_stratum_target
160 int create_inferior (const char *program
,
161 const std::vector
<char *> &program_args
) override
;
163 void post_create_inferior () override
;
165 int attach (unsigned long pid
) override
;
167 int kill (process_info
*proc
) override
;
169 int detach (process_info
*proc
) override
;
171 void mourn (process_info
*proc
) override
;
173 void join (int pid
) override
;
175 bool thread_alive (ptid_t pid
) override
;
177 void resume (thread_resume
*resume_info
, size_t n
) override
;
179 ptid_t
wait (ptid_t ptid
, target_waitstatus
*status
,
180 int options
) override
;
182 void fetch_registers (regcache
*regcache
, int regno
) override
;
184 void store_registers (regcache
*regcache
, int regno
) override
;
186 int prepare_to_access_memory () override
;
188 void done_accessing_memory () override
;
190 int read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
,
193 int write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
,
196 void look_up_symbols () override
;
198 void request_interrupt () override
;
200 bool supports_read_auxv () override
;
202 int read_auxv (CORE_ADDR offset
, unsigned char *myaddr
,
203 unsigned int len
) override
;
205 int insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
206 int size
, raw_breakpoint
*bp
) override
;
208 int remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
209 int size
, raw_breakpoint
*bp
) override
;
211 bool stopped_by_sw_breakpoint () override
;
213 bool supports_stopped_by_sw_breakpoint () override
;
215 bool stopped_by_hw_breakpoint () override
;
217 bool supports_stopped_by_hw_breakpoint () override
;
219 bool supports_hardware_single_step () override
;
221 bool stopped_by_watchpoint () override
;
223 CORE_ADDR
stopped_data_address () override
;
225 bool supports_read_offsets () override
;
227 int read_offsets (CORE_ADDR
*text
, CORE_ADDR
*data
) override
;
229 bool supports_get_tls_address () override
;
231 int get_tls_address (thread_info
*thread
, CORE_ADDR offset
,
232 CORE_ADDR load_module
, CORE_ADDR
*address
) override
;
234 bool supports_qxfer_osdata () override
;
236 int qxfer_osdata (const char *annex
, unsigned char *readbuf
,
237 unsigned const char *writebuf
,
238 CORE_ADDR offset
, int len
) override
;
240 bool supports_qxfer_siginfo () override
;
242 int qxfer_siginfo (const char *annex
, unsigned char *readbuf
,
243 unsigned const char *writebuf
,
244 CORE_ADDR offset
, int len
) override
;
246 bool supports_non_stop () override
;
248 bool async (bool enable
) override
;
250 int start_non_stop (bool enable
) override
;
252 bool supports_multi_process () override
;
254 bool supports_fork_events () override
;
256 bool supports_vfork_events () override
;
258 bool supports_exec_events () override
;
260 void handle_new_gdb_connection () override
;
262 int handle_monitor_command (char *mon
) override
;
264 int core_of_thread (ptid_t ptid
) override
;
266 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
267 bool supports_read_loadmap () override
;
269 int read_loadmap (const char *annex
, CORE_ADDR offset
,
270 unsigned char *myaddr
, unsigned int len
) override
;
273 CORE_ADDR
read_pc (regcache
*regcache
) override
;
275 void write_pc (regcache
*regcache
, CORE_ADDR pc
) override
;
277 bool supports_thread_stopped () override
;
279 bool thread_stopped (thread_info
*thread
) override
;
281 void pause_all (bool freeze
) override
;
283 void unpause_all (bool unfreeze
) override
;
285 void stabilize_threads () override
;
287 struct emit_ops
*emit_ops () override
;
289 bool supports_disable_randomization () override
;
291 bool supports_qxfer_libraries_svr4 () override
;
293 int qxfer_libraries_svr4 (const char *annex
,
294 unsigned char *readbuf
,
295 unsigned const char *writebuf
,
296 CORE_ADDR offset
, int len
) override
;
298 bool supports_agent () override
;
300 #ifdef HAVE_LINUX_BTRACE
301 btrace_target_info
*enable_btrace (ptid_t ptid
,
302 const btrace_config
*conf
) override
;
304 int disable_btrace (btrace_target_info
*tinfo
) override
;
306 int read_btrace (btrace_target_info
*tinfo
, buffer
*buf
,
307 enum btrace_read_type type
) override
;
309 int read_btrace_conf (const btrace_target_info
*tinfo
,
310 buffer
*buf
) override
;
313 bool supports_range_stepping () override
;
315 bool supports_pid_to_exec_file () override
;
317 char *pid_to_exec_file (int pid
) override
;
319 bool supports_multifs () override
;
321 int multifs_open (int pid
, const char *filename
, int flags
,
322 mode_t mode
) override
;
324 int multifs_unlink (int pid
, const char *filename
) override
;
326 ssize_t
multifs_readlink (int pid
, const char *filename
, char *buf
,
327 size_t bufsiz
) override
;
329 const char *thread_name (ptid_t thread
) override
;
332 bool thread_handle (ptid_t ptid
, gdb_byte
**handle
,
333 int *handle_len
) override
;
336 bool supports_catch_syscall () override
;
338 int get_ipa_tdesc_idx () override
;
340 /* Return the information to access registers. This has public
341 visibility because proc-service uses it. */
342 virtual const regs_info
*get_regs_info () = 0;
346 /* Handle a GNU/Linux extended wait response. If we see a clone,
347 fork, or vfork event, we need to add the new LWP to our list
348 (and return 0 so as not to report the trap to higher layers).
349 If we see an exec event, we will modify ORIG_EVENT_LWP to point
350 to a new LWP representing the new program. */
351 int handle_extended_wait (lwp_info
**orig_event_lwp
, int wstat
);
353 /* Do low-level handling of the event, and check if we should go on
354 and pass it to caller code. Return the affected lwp if we are, or
356 lwp_info
*filter_event (int lwpid
, int wstat
);
358 /* Wait for an event from child(ren) WAIT_PTID, and return any that
359 match FILTER_PTID (leaving others pending). The PTIDs can be:
360 minus_one_ptid, to specify any child; a pid PTID, specifying all
361 lwps of a thread group; or a PTID representing a single lwp. Store
362 the stop status through the status pointer WSTAT. OPTIONS is
363 passed to the waitpid call. Return 0 if no event was found and
364 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
365 was found. Return the PID of the stopped child otherwise. */
366 int wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
367 int *wstatp
, int options
);
369 /* Wait for an event from child(ren) PTID. PTIDs can be:
370 minus_one_ptid, to specify any child; a pid PTID, specifying all
371 lwps of a thread group; or a PTID representing a single lwp. Store
372 the stop status through the status pointer WSTAT. OPTIONS is
373 passed to the waitpid call. Return 0 if no event was found and
374 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
375 was found. Return the PID of the stopped child otherwise. */
376 int wait_for_event (ptid_t ptid
, int *wstatp
, int options
);
378 /* Wait for all children to stop for the SIGSTOPs we just queued. */
379 void wait_for_sigstop ();
381 /* Wait for process, returns status. */
382 ptid_t
wait_1 (ptid_t ptid
, target_waitstatus
*ourstatus
,
385 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
386 If SUSPEND, then also increase the suspend count of every LWP,
388 void stop_all_lwps (int suspend
, lwp_info
*except
);
390 /* Stopped LWPs that the client wanted to be running, that don't have
391 pending statuses, are set to run again, except for EXCEPT, if not
392 NULL. This undoes a stop_all_lwps call. */
393 void unstop_all_lwps (int unsuspend
, lwp_info
*except
);
395 /* Start a step-over operation on LWP. When LWP stopped at a
396 breakpoint, to make progress, we need to remove the breakpoint out
397 of the way. If we let other threads run while we do that, they may
398 pass by the breakpoint location and miss hitting it. To avoid
399 that, a step-over momentarily stops all threads while LWP is
400 single-stepped by either hardware or software while the breakpoint
401 is temporarily uninserted from the inferior. When the single-step
402 finishes, we reinsert the breakpoint, and let all threads that are
403 supposed to be running, run again. */
404 void start_step_over (lwp_info
*lwp
);
406 /* If there's a step over in progress, wait until all threads stop
407 (that is, until the stepping thread finishes its step), and
408 unsuspend all lwps. The stepping thread ends with its status
409 pending, which is processed later when we get back to processing
411 void complete_ongoing_step_over ();
413 /* When we finish a step-over, set threads running again. If there's
414 another thread that may need a step-over, now's the time to start
415 it. Eventually, we'll move all threads past their breakpoints. */
416 void proceed_all_lwps ();
418 /* The reason we resume in the caller, is because we want to be able
419 to pass lwp->status_pending as WSTAT, and we need to clear
420 status_pending_p before resuming, otherwise, resume_one_lwp
421 refuses to resume. */
422 bool maybe_move_out_of_jump_pad (lwp_info
*lwp
, int *wstat
);
424 /* Move THREAD out of the jump pad. */
425 void move_out_of_jump_pad (thread_info
*thread
);
427 /* Call low_arch_setup on THREAD. */
428 void arch_setup_thread (thread_info
*thread
);
430 #ifdef HAVE_LINUX_USRREGS
431 /* Fetch one register. */
432 void fetch_register (const usrregs_info
*usrregs
, regcache
*regcache
,
435 /* Store one register. */
436 void store_register (const usrregs_info
*usrregs
, regcache
*regcache
,
440 /* Fetch all registers, or just one, from the child process.
441 If REGNO is -1, do this for all registers, skipping any that are
442 assumed to have been retrieved by regsets_fetch_inferior_registers,
443 unless ALL is non-zero.
444 Otherwise, REGNO specifies which register (so we can save time). */
445 void usr_fetch_inferior_registers (const regs_info
*regs_info
,
446 regcache
*regcache
, int regno
, int all
);
448 /* Store our register values back into the inferior.
449 If REGNO is -1, do this for all registers, skipping any that are
450 assumed to have been saved by regsets_store_inferior_registers,
451 unless ALL is non-zero.
452 Otherwise, REGNO specifies which register (so we can save time). */
453 void usr_store_inferior_registers (const regs_info
*regs_info
,
454 regcache
*regcache
, int regno
, int all
);
456 /* Return the PC as read from the regcache of LWP, without any
458 CORE_ADDR
get_pc (lwp_info
*lwp
);
460 /* Called when the LWP stopped for a signal/trap. If it stopped for a
461 trap check what caused it (breakpoint, watchpoint, trace, etc.),
462 and save the result in the LWP's stop_reason field. If it stopped
463 for a breakpoint, decrement the PC if necessary on the lwp's
464 architecture. Returns true if we now have the LWP's stop PC. */
465 bool save_stop_reason (lwp_info
*lwp
);
467 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
468 SIGNAL is nonzero, give it that signal. */
469 void resume_one_lwp_throw (lwp_info
*lwp
, int step
, int signal
,
472 /* Like resume_one_lwp_throw, but no error is thrown if the LWP
473 disappears while we try to resume it. */
474 void resume_one_lwp (lwp_info
*lwp
, int step
, int signal
, siginfo_t
*info
);
476 /* This function is called once per thread. We check the thread's
477 last resume request, which will tell us whether to resume, step, or
478 leave the thread stopped. Any signal the client requested to be
479 delivered has already been enqueued at this point.
481 If any thread that GDB wants running is stopped at an internal
482 breakpoint that needs stepping over, we start a step-over operation
483 on that particular thread, and leave all others stopped. */
484 void proceed_one_lwp (thread_info
*thread
, lwp_info
*except
);
486 /* This function is called once per thread. We check the thread's
487 resume request, which will tell us whether to resume, step, or
488 leave the thread stopped; and what signal, if any, it should be
491 For threads which we aren't explicitly told otherwise, we preserve
492 the stepping flag; this is used for stepping over gdbserver-placed
495 If pending_flags was set in any thread, we queue any needed
496 signals, since we won't actually resume. We already have a pending
497 event to report, so we don't need to preserve any step requests;
498 they should be re-issued if necessary. */
499 void resume_one_thread (thread_info
*thread
, bool leave_all_stopped
);
501 /* Return true if this lwp has an interesting status pending. */
502 bool status_pending_p_callback (thread_info
*thread
, ptid_t ptid
);
504 /* Resume LWPs that are currently stopped without any pending status
505 to report, but are resumed from the core's perspective. */
506 void resume_stopped_resumed_lwps (thread_info
*thread
);
508 /* Unsuspend THREAD, except EXCEPT, and proceed. */
509 void unsuspend_and_proceed_one_lwp (thread_info
*thread
, lwp_info
*except
);
511 /* Return true if this lwp still has an interesting status pending.
512 If not (e.g., it had stopped for a breakpoint that is gone), return
514 bool thread_still_has_status_pending (thread_info
*thread
);
516 /* Return true if this lwp is to-be-resumed and has an interesting
518 bool resume_status_pending (thread_info
*thread
);
520 /* Return true if this lwp that GDB wants running is stopped at an
521 internal breakpoint that we need to step over. It assumes that
522 any required STOP_PC adjustment has already been propagated to
523 the inferior's regcache. */
524 bool thread_needs_step_over (thread_info
*thread
);
526 /* Single step via hardware or software single step.
527 Return 1 if hardware single stepping, 0 if software single stepping
528 or can't single step. */
529 int single_step (lwp_info
* lwp
);
531 /* Install breakpoints for software single stepping. */
532 void install_software_single_step_breakpoints (lwp_info
*lwp
);
534 /* Fetch the possibly triggered data watchpoint info and store it in
537 On some archs, like x86, that use debug registers to set
538 watchpoints, it's possible that the way to know which watched
539 address trapped, is to check the register that is used to select
540 which address to watch. Problem is, between setting the watchpoint
541 and reading back which data address trapped, the user may change
542 the set of watchpoints, and, as a consequence, GDB changes the
543 debug registers in the inferior. To avoid reading back a stale
544 stopped-data-address when that happens, we cache in LP the fact
545 that a watchpoint trapped, and the corresponding data address, as
546 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
547 registers meanwhile, we have the cached data we can rely on. */
548 bool check_stopped_by_watchpoint (lwp_info
*child
);
550 /* Convert a native/host siginfo object, into/from the siginfo in the
551 layout of the inferiors' architecture. */
552 void siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
,
555 /* Add a process to the common process list, and set its private
557 process_info
*add_linux_process (int pid
, int attached
);
559 /* Add a new thread. */
560 lwp_info
*add_lwp (ptid_t ptid
);
562 /* Delete a thread. */
563 void delete_lwp (lwp_info
*lwp
);
565 public: /* Make this public because it's used from outside. */
566 /* Attach to an inferior process. Returns 0 on success, ERRNO on
568 int attach_lwp (ptid_t ptid
);
570 private: /* Back to private. */
571 /* Detach from LWP. */
572 void detach_one_lwp (lwp_info
*lwp
);
574 /* Detect zombie thread group leaders, and "exit" them. We can't
575 reap their exits until all other threads in the group have
577 void check_zombie_leaders ();
579 /* Convenience function that is called when the kernel reports an exit
580 event. This decides whether to report the event to GDB as a
581 process exit event, a thread exit event, or to suppress the
583 ptid_t
filter_exit_event (lwp_info
*event_child
,
584 target_waitstatus
*ourstatus
);
586 /* Returns true if THREAD is stopped in a jump pad, and we can't
587 move it out, because we need to report the stop event to GDB. For
588 example, if the user puts a breakpoint in the jump pad, it's
589 because she wants to debug it. */
590 bool stuck_in_jump_pad (thread_info
*thread
);
592 /* Convenience wrapper. Returns information about LWP's fast tracepoint
593 collection status. */
594 fast_tpoint_collect_result linux_fast_tracepoint_collecting
595 (lwp_info
*lwp
, fast_tpoint_collect_status
*status
);
598 /* The architecture-specific "low" methods are listed below. */
600 /* Architecture-specific setup for the current thread. */
601 virtual void low_arch_setup () = 0;
603 /* Return false if we can fetch/store the register, true if we cannot
604 fetch/store the register. */
605 virtual bool low_cannot_fetch_register (int regno
) = 0;
607 virtual bool low_cannot_store_register (int regno
) = 0;
609 /* Hook to fetch a register in some non-standard way. Used for
610 example by backends that have read-only registers with hardcoded
611 values (e.g., IA64's gr0/fr0/fr1). Returns true if register
612 REGNO was supplied, false if not, and we should fallback to the
613 standard ptrace methods. */
614 virtual bool low_fetch_register (regcache
*regcache
, int regno
);
616 /* Return true if breakpoints are supported. Such targets must
617 implement the GET_PC and SET_PC methods. */
618 virtual bool low_supports_breakpoints ();
620 virtual CORE_ADDR
low_get_pc (regcache
*regcache
);
622 virtual void low_set_pc (regcache
*regcache
, CORE_ADDR newpc
);
624 /* Find the next possible PCs after the current instruction executes.
625 Targets that override this method should also override
626 'supports_software_single_step' to return true. */
627 virtual std::vector
<CORE_ADDR
> low_get_next_pcs (regcache
*regcache
);
629 /* Return true if there is a breakpoint at PC. */
630 virtual bool low_breakpoint_at (CORE_ADDR pc
) = 0;
632 /* Breakpoint and watchpoint related functions. See target.h for
634 virtual int low_insert_point (raw_bkpt_type type
, CORE_ADDR addr
,
635 int size
, raw_breakpoint
*bp
);
637 virtual int low_remove_point (raw_bkpt_type type
, CORE_ADDR addr
,
638 int size
, raw_breakpoint
*bp
);
640 virtual bool low_stopped_by_watchpoint ();
642 virtual CORE_ADDR
low_stopped_data_address ();
644 /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
645 for registers smaller than an xfer unit). */
646 virtual void low_collect_ptrace_register (regcache
*regcache
, int regno
,
649 virtual void low_supply_ptrace_register (regcache
*regcache
, int regno
,
652 /* Hook to convert from target format to ptrace format and back.
653 Returns true if any conversion was done; false otherwise.
654 If DIRECTION is 1, then copy from INF to NATIVE.
655 If DIRECTION is 0, copy from NATIVE to INF. */
656 virtual bool low_siginfo_fixup (siginfo_t
*native
, gdb_byte
*inf
,
659 /* Hook to call when a new process is created or attached to.
660 If extra per-process architecture-specific data is needed,
662 virtual arch_process_info
*low_new_process ();
664 /* Hook to call when a process is being deleted. If extra per-process
665 architecture-specific data is needed, delete it here. */
666 virtual void low_delete_process (arch_process_info
*info
);
668 /* Hook to call when a new thread is detected.
669 If extra per-thread architecture-specific data is needed,
671 virtual void low_new_thread (lwp_info
*);
673 /* Hook to call when a thread is being deleted. If extra per-thread
674 architecture-specific data is needed, delete it here. */
675 virtual void low_delete_thread (arch_lwp_info
*);
677 /* Hook to call, if any, when a new fork is attached. */
678 virtual void low_new_fork (process_info
*parent
, process_info
*child
);
680 /* Hook to call prior to resuming a thread. */
681 virtual void low_prepare_to_resume (lwp_info
*lwp
);
683 /* Fill ADDRP with the thread area address of LWPID. Returns 0 on
684 success, -1 on failure. */
685 virtual int low_get_thread_area (int lwpid
, CORE_ADDR
*addrp
);
687 /* How many bytes the PC should be decremented after a break. */
688 virtual int low_decr_pc_after_break ();
691 extern linux_process_target
*the_linux_target
;
693 #define get_thread_lwp(thr) ((struct lwp_info *) (thread_target_data (thr)))
694 #define get_lwp_thread(lwp) ((lwp)->thread)
696 /* This struct is recorded in the target_data field of struct thread_info.
698 On linux ``all_threads'' is keyed by the LWP ID, which we use as the
699 GDB protocol representation of the thread ID. Threads also have
700 a "process ID" (poorly named) which is (presently) the same as the
703 There is also ``all_processes'' is keyed by the "overall process ID",
704 which GNU/Linux calls tgid, "thread group ID". */
708 /* Backlink to the parent object. */
709 struct thread_info
*thread
;
711 /* If this flag is set, the next SIGSTOP will be ignored (the
712 process will be immediately resumed). This means that either we
713 sent the SIGSTOP to it ourselves and got some other pending event
714 (so the SIGSTOP is still pending), or that we stopped the
715 inferior implicitly via PTRACE_ATTACH and have not waited for it
719 /* When this is true, we shall not try to resume this thread, even
720 if last_resume_kind isn't resume_stop. */
723 /* If this flag is set, the lwp is known to be stopped right now (stop
724 event already received in a wait()). */
727 /* Signal whether we are in a SYSCALL_ENTRY or
728 in a SYSCALL_RETURN event.
730 - TARGET_WAITKIND_SYSCALL_ENTRY
731 - TARGET_WAITKIND_SYSCALL_RETURN */
732 enum target_waitkind syscall_state
;
734 /* When stopped is set, the last wait status recorded for this lwp. */
737 /* If WAITSTATUS->KIND != TARGET_WAITKIND_IGNORE, the waitstatus for
738 this LWP's last event, to pass to GDB without any further
739 processing. This is used to store extended ptrace event
740 information or exit status until it can be reported to GDB. */
741 struct target_waitstatus waitstatus
;
743 /* A pointer to the fork child/parent relative. Valid only while
744 the parent fork event is not reported to higher layers. Used to
745 avoid wildcard vCont actions resuming a fork child before GDB is
746 notified about the parent's fork event. */
747 struct lwp_info
*fork_relative
;
749 /* When stopped is set, this is where the lwp last stopped, with
750 decr_pc_after_break already accounted for. If the LWP is
751 running, this is the address at which the lwp was resumed. */
754 /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
756 int status_pending_p
;
759 /* The reason the LWP last stopped, if we need to track it
760 (breakpoint, watchpoint, etc.) */
761 enum target_stop_reason stop_reason
;
763 /* On architectures where it is possible to know the data address of
764 a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
765 contains such data address. Only valid if STOPPED_BY_WATCHPOINT
767 CORE_ADDR stopped_data_address
;
769 /* If this is non-zero, it is a breakpoint to be reinserted at our next
770 stop (SIGTRAP stops only). */
771 CORE_ADDR bp_reinsert
;
773 /* If this flag is set, the last continue operation at the ptrace
774 level on this process was a single-step. */
777 /* Range to single step within. This is a copy of the step range
778 passed along the last resume request. See 'struct
780 CORE_ADDR step_range_start
; /* Inclusive */
781 CORE_ADDR step_range_end
; /* Exclusive */
783 /* If this flag is set, we need to set the event request flags the
784 next time we see this LWP stop. */
785 int must_set_ptrace_flags
;
787 /* If this is non-zero, it points to a chain of signals which need to
788 be delivered to this process. */
789 struct pending_signals
*pending_signals
;
791 /* A link used when resuming. It is initialized from the resume request,
792 and then processed and cleared in linux_resume_one_lwp. */
793 struct thread_resume
*resume
;
795 /* Information bout this lwp's fast tracepoint collection status (is it
796 currently stopped in the jump pad, and if so, before or at/after the
797 relocated instruction). Normally, we won't care about this, but we will
798 if a signal arrives to this lwp while it is collecting. */
799 fast_tpoint_collect_result collecting_fast_tracepoint
;
801 /* If this is non-zero, it points to a chain of signals which need
802 to be reported to GDB. These were deferred because the thread
803 was doing a fast tracepoint collect when they arrived. */
804 struct pending_signals
*pending_signals_to_report
;
806 /* When collecting_fast_tracepoint is first found to be 1, we insert
807 a exit-jump-pad-quickly breakpoint. This is it. */
808 struct breakpoint
*exit_jump_pad_bkpt
;
812 /* The thread handle, used for e.g. TLS access. Only valid if
813 THREAD_KNOWN is set. */
816 /* The pthread_t handle. */
817 thread_t thread_handle
;
820 /* Arch-specific additions. */
821 struct arch_lwp_info
*arch_private
;
824 int linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
);
826 /* Attach to PTID. Returns 0 on success, non-zero otherwise (an
828 int linux_attach_lwp (ptid_t ptid
);
830 struct lwp_info
*find_lwp_pid (ptid_t ptid
);
831 /* For linux_stop_lwp see nat/linux-nat.h. */
833 #ifdef HAVE_LINUX_REGSETS
834 void initialize_regsets_info (struct regsets_info
*regsets_info
);
837 void initialize_low_arch (void);
839 void linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
);
840 CORE_ADDR
linux_get_pc_32bit (struct regcache
*regcache
);
842 void linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
);
843 CORE_ADDR
linux_get_pc_64bit (struct regcache
*regcache
);
845 /* From thread-db.c */
846 int thread_db_init (void);
847 void thread_db_detach (struct process_info
*);
848 void thread_db_mourn (struct process_info
*);
849 int thread_db_handle_monitor_command (char *);
850 int thread_db_get_tls_address (struct thread_info
*thread
, CORE_ADDR offset
,
851 CORE_ADDR load_module
, CORE_ADDR
*address
);
852 int thread_db_look_up_one_symbol (const char *name
, CORE_ADDR
*addrp
);
854 /* Called from linux-low.c when a clone event is detected. Upon entry,
855 both the clone and the parent should be stopped. This function does
856 whatever is required have the clone under thread_db's control. */
858 void thread_db_notice_clone (struct thread_info
*parent_thr
, ptid_t child_ptid
);
860 bool thread_db_thread_handle (ptid_t ptid
, gdb_byte
**handle
, int *handle_len
);
862 extern int have_ptrace_getregset
;
864 /* Search for the value with type MATCH in the auxv vector with
865 entries of length WORDSIZE bytes. If found, store the value in
866 *VALP and return 1. If not found or if there is an error, return
869 int linux_get_auxv (int wordsize
, CORE_ADDR match
,
872 /* Fetch the AT_HWCAP entry from the auxv vector, where entries are length
873 WORDSIZE. If no entry was found, return zero. */
875 CORE_ADDR
linux_get_hwcap (int wordsize
);
877 /* Fetch the AT_HWCAP2 entry from the auxv vector, where entries are length
878 WORDSIZE. If no entry was found, return zero. */
880 CORE_ADDR
linux_get_hwcap2 (int wordsize
);
882 #endif /* GDBSERVER_LINUX_LOW_H */