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 /* Returns true if the low target supports range stepping. */
135 int (*supports_range_stepping
) (void);
138 int (*supports_hardware_single_step
) (void);
140 /* Fill *SYSNO with the syscall nr trapped. Only to be called when
141 inferior is stopped due to SYSCALL_SIGTRAP. */
142 void (*get_syscall_trapinfo
) (struct regcache
*regcache
, int *sysno
);
145 int (*get_ipa_tdesc_idx
) (void);
148 extern struct linux_target_ops the_low_target
;
150 /* Target ops definitions for a Linux target. */
152 class linux_process_target
: public process_stratum_target
156 int create_inferior (const char *program
,
157 const std::vector
<char *> &program_args
) override
;
159 void post_create_inferior () override
;
161 int attach (unsigned long pid
) override
;
163 int kill (process_info
*proc
) override
;
165 int detach (process_info
*proc
) override
;
167 void mourn (process_info
*proc
) override
;
169 void join (int pid
) override
;
171 bool thread_alive (ptid_t pid
) override
;
173 void resume (thread_resume
*resume_info
, size_t n
) override
;
175 ptid_t
wait (ptid_t ptid
, target_waitstatus
*status
,
176 int options
) override
;
178 void fetch_registers (regcache
*regcache
, int regno
) override
;
180 void store_registers (regcache
*regcache
, int regno
) override
;
182 int prepare_to_access_memory () override
;
184 void done_accessing_memory () override
;
186 int read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
,
189 int write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
,
192 void look_up_symbols () override
;
194 void request_interrupt () override
;
196 bool supports_read_auxv () override
;
198 int read_auxv (CORE_ADDR offset
, unsigned char *myaddr
,
199 unsigned int len
) override
;
201 int insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
202 int size
, raw_breakpoint
*bp
) override
;
204 int remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
205 int size
, raw_breakpoint
*bp
) override
;
207 bool stopped_by_sw_breakpoint () override
;
209 bool supports_stopped_by_sw_breakpoint () override
;
211 bool stopped_by_hw_breakpoint () override
;
213 bool supports_stopped_by_hw_breakpoint () override
;
215 bool supports_hardware_single_step () override
;
217 bool stopped_by_watchpoint () override
;
219 CORE_ADDR
stopped_data_address () override
;
221 bool supports_read_offsets () override
;
223 int read_offsets (CORE_ADDR
*text
, CORE_ADDR
*data
) override
;
225 bool supports_get_tls_address () override
;
227 int get_tls_address (thread_info
*thread
, CORE_ADDR offset
,
228 CORE_ADDR load_module
, CORE_ADDR
*address
) override
;
230 bool supports_qxfer_osdata () override
;
232 int qxfer_osdata (const char *annex
, unsigned char *readbuf
,
233 unsigned const char *writebuf
,
234 CORE_ADDR offset
, int len
) override
;
236 bool supports_qxfer_siginfo () override
;
238 int qxfer_siginfo (const char *annex
, unsigned char *readbuf
,
239 unsigned const char *writebuf
,
240 CORE_ADDR offset
, int len
) override
;
242 bool supports_non_stop () override
;
244 bool async (bool enable
) override
;
246 int start_non_stop (bool enable
) override
;
248 bool supports_multi_process () override
;
250 bool supports_fork_events () override
;
252 bool supports_vfork_events () override
;
254 bool supports_exec_events () override
;
256 void handle_new_gdb_connection () override
;
258 int handle_monitor_command (char *mon
) override
;
260 int core_of_thread (ptid_t ptid
) override
;
262 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
263 bool supports_read_loadmap () override
;
265 int read_loadmap (const char *annex
, CORE_ADDR offset
,
266 unsigned char *myaddr
, unsigned int len
) override
;
269 CORE_ADDR
read_pc (regcache
*regcache
) override
;
271 void write_pc (regcache
*regcache
, CORE_ADDR pc
) override
;
273 bool supports_thread_stopped () override
;
275 bool thread_stopped (thread_info
*thread
) override
;
277 void pause_all (bool freeze
) override
;
279 void unpause_all (bool unfreeze
) override
;
281 void stabilize_threads () override
;
283 bool supports_disable_randomization () override
;
285 bool supports_qxfer_libraries_svr4 () override
;
287 int qxfer_libraries_svr4 (const char *annex
,
288 unsigned char *readbuf
,
289 unsigned const char *writebuf
,
290 CORE_ADDR offset
, int len
) override
;
292 bool supports_agent () override
;
294 #ifdef HAVE_LINUX_BTRACE
295 btrace_target_info
*enable_btrace (ptid_t ptid
,
296 const btrace_config
*conf
) override
;
298 int disable_btrace (btrace_target_info
*tinfo
) override
;
300 int read_btrace (btrace_target_info
*tinfo
, buffer
*buf
,
301 enum btrace_read_type type
) override
;
303 int read_btrace_conf (const btrace_target_info
*tinfo
,
304 buffer
*buf
) override
;
307 bool supports_range_stepping () override
;
309 bool supports_pid_to_exec_file () override
;
311 char *pid_to_exec_file (int pid
) override
;
313 bool supports_multifs () override
;
315 int multifs_open (int pid
, const char *filename
, int flags
,
316 mode_t mode
) override
;
318 int multifs_unlink (int pid
, const char *filename
) override
;
320 ssize_t
multifs_readlink (int pid
, const char *filename
, char *buf
,
321 size_t bufsiz
) override
;
323 const char *thread_name (ptid_t thread
) override
;
326 bool thread_handle (ptid_t ptid
, gdb_byte
**handle
,
327 int *handle_len
) override
;
330 bool supports_catch_syscall () override
;
332 int get_ipa_tdesc_idx () override
;
334 /* Return the information to access registers. This has public
335 visibility because proc-service uses it. */
336 virtual const regs_info
*get_regs_info () = 0;
340 /* Handle a GNU/Linux extended wait response. If we see a clone,
341 fork, or vfork event, we need to add the new LWP to our list
342 (and return 0 so as not to report the trap to higher layers).
343 If we see an exec event, we will modify ORIG_EVENT_LWP to point
344 to a new LWP representing the new program. */
345 int handle_extended_wait (lwp_info
**orig_event_lwp
, int wstat
);
347 /* Do low-level handling of the event, and check if we should go on
348 and pass it to caller code. Return the affected lwp if we are, or
350 lwp_info
*filter_event (int lwpid
, int wstat
);
352 /* Wait for an event from child(ren) WAIT_PTID, and return any that
353 match FILTER_PTID (leaving others pending). The PTIDs can be:
354 minus_one_ptid, to specify any child; a pid PTID, specifying all
355 lwps of a thread group; or a PTID representing a single lwp. Store
356 the stop status through the status pointer WSTAT. OPTIONS is
357 passed to the waitpid call. Return 0 if no event was found and
358 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
359 was found. Return the PID of the stopped child otherwise. */
360 int wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
361 int *wstatp
, int options
);
363 /* Wait for an event from child(ren) PTID. PTIDs can be:
364 minus_one_ptid, to specify any child; a pid PTID, specifying all
365 lwps of a thread group; or a PTID representing a single lwp. Store
366 the stop status through the status pointer WSTAT. OPTIONS is
367 passed to the waitpid call. Return 0 if no event was found and
368 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
369 was found. Return the PID of the stopped child otherwise. */
370 int wait_for_event (ptid_t ptid
, int *wstatp
, int options
);
372 /* Wait for all children to stop for the SIGSTOPs we just queued. */
373 void wait_for_sigstop ();
375 /* Wait for process, returns status. */
376 ptid_t
wait_1 (ptid_t ptid
, target_waitstatus
*ourstatus
,
379 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
380 If SUSPEND, then also increase the suspend count of every LWP,
382 void stop_all_lwps (int suspend
, lwp_info
*except
);
384 /* Stopped LWPs that the client wanted to be running, that don't have
385 pending statuses, are set to run again, except for EXCEPT, if not
386 NULL. This undoes a stop_all_lwps call. */
387 void unstop_all_lwps (int unsuspend
, lwp_info
*except
);
389 /* Start a step-over operation on LWP. When LWP stopped at a
390 breakpoint, to make progress, we need to remove the breakpoint out
391 of the way. If we let other threads run while we do that, they may
392 pass by the breakpoint location and miss hitting it. To avoid
393 that, a step-over momentarily stops all threads while LWP is
394 single-stepped by either hardware or software while the breakpoint
395 is temporarily uninserted from the inferior. When the single-step
396 finishes, we reinsert the breakpoint, and let all threads that are
397 supposed to be running, run again. */
398 void start_step_over (lwp_info
*lwp
);
400 /* If there's a step over in progress, wait until all threads stop
401 (that is, until the stepping thread finishes its step), and
402 unsuspend all lwps. The stepping thread ends with its status
403 pending, which is processed later when we get back to processing
405 void complete_ongoing_step_over ();
407 /* When we finish a step-over, set threads running again. If there's
408 another thread that may need a step-over, now's the time to start
409 it. Eventually, we'll move all threads past their breakpoints. */
410 void proceed_all_lwps ();
412 /* The reason we resume in the caller, is because we want to be able
413 to pass lwp->status_pending as WSTAT, and we need to clear
414 status_pending_p before resuming, otherwise, resume_one_lwp
415 refuses to resume. */
416 bool maybe_move_out_of_jump_pad (lwp_info
*lwp
, int *wstat
);
418 /* Move THREAD out of the jump pad. */
419 void move_out_of_jump_pad (thread_info
*thread
);
421 /* Call low_arch_setup on THREAD. */
422 void arch_setup_thread (thread_info
*thread
);
424 #ifdef HAVE_LINUX_USRREGS
425 /* Fetch one register. */
426 void fetch_register (const usrregs_info
*usrregs
, regcache
*regcache
,
429 /* Store one register. */
430 void store_register (const usrregs_info
*usrregs
, regcache
*regcache
,
434 /* Fetch all registers, or just one, from the child process.
435 If REGNO is -1, do this for all registers, skipping any that are
436 assumed to have been retrieved by regsets_fetch_inferior_registers,
437 unless ALL is non-zero.
438 Otherwise, REGNO specifies which register (so we can save time). */
439 void usr_fetch_inferior_registers (const regs_info
*regs_info
,
440 regcache
*regcache
, int regno
, int all
);
442 /* Store our register values back into the inferior.
443 If REGNO is -1, do this for all registers, skipping any that are
444 assumed to have been saved by regsets_store_inferior_registers,
445 unless ALL is non-zero.
446 Otherwise, REGNO specifies which register (so we can save time). */
447 void usr_store_inferior_registers (const regs_info
*regs_info
,
448 regcache
*regcache
, int regno
, int all
);
450 /* Return the PC as read from the regcache of LWP, without any
452 CORE_ADDR
get_pc (lwp_info
*lwp
);
454 /* Called when the LWP stopped for a signal/trap. If it stopped for a
455 trap check what caused it (breakpoint, watchpoint, trace, etc.),
456 and save the result in the LWP's stop_reason field. If it stopped
457 for a breakpoint, decrement the PC if necessary on the lwp's
458 architecture. Returns true if we now have the LWP's stop PC. */
459 bool save_stop_reason (lwp_info
*lwp
);
461 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
462 SIGNAL is nonzero, give it that signal. */
463 void resume_one_lwp_throw (lwp_info
*lwp
, int step
, int signal
,
466 /* Like resume_one_lwp_throw, but no error is thrown if the LWP
467 disappears while we try to resume it. */
468 void resume_one_lwp (lwp_info
*lwp
, int step
, int signal
, siginfo_t
*info
);
470 /* This function is called once per thread. We check the thread's
471 last resume request, which will tell us whether to resume, step, or
472 leave the thread stopped. Any signal the client requested to be
473 delivered has already been enqueued at this point.
475 If any thread that GDB wants running is stopped at an internal
476 breakpoint that needs stepping over, we start a step-over operation
477 on that particular thread, and leave all others stopped. */
478 void proceed_one_lwp (thread_info
*thread
, lwp_info
*except
);
480 /* This function is called once per thread. We check the thread's
481 resume request, which will tell us whether to resume, step, or
482 leave the thread stopped; and what signal, if any, it should be
485 For threads which we aren't explicitly told otherwise, we preserve
486 the stepping flag; this is used for stepping over gdbserver-placed
489 If pending_flags was set in any thread, we queue any needed
490 signals, since we won't actually resume. We already have a pending
491 event to report, so we don't need to preserve any step requests;
492 they should be re-issued if necessary. */
493 void resume_one_thread (thread_info
*thread
, bool leave_all_stopped
);
495 /* Return true if this lwp has an interesting status pending. */
496 bool status_pending_p_callback (thread_info
*thread
, ptid_t ptid
);
498 /* Resume LWPs that are currently stopped without any pending status
499 to report, but are resumed from the core's perspective. */
500 void resume_stopped_resumed_lwps (thread_info
*thread
);
502 /* Unsuspend THREAD, except EXCEPT, and proceed. */
503 void unsuspend_and_proceed_one_lwp (thread_info
*thread
, lwp_info
*except
);
505 /* Return true if this lwp still has an interesting status pending.
506 If not (e.g., it had stopped for a breakpoint that is gone), return
508 bool thread_still_has_status_pending (thread_info
*thread
);
510 /* Return true if this lwp is to-be-resumed and has an interesting
512 bool resume_status_pending (thread_info
*thread
);
514 /* Return true if this lwp that GDB wants running is stopped at an
515 internal breakpoint that we need to step over. It assumes that
516 any required STOP_PC adjustment has already been propagated to
517 the inferior's regcache. */
518 bool thread_needs_step_over (thread_info
*thread
);
520 /* Single step via hardware or software single step.
521 Return 1 if hardware single stepping, 0 if software single stepping
522 or can't single step. */
523 int single_step (lwp_info
* lwp
);
525 /* Install breakpoints for software single stepping. */
526 void install_software_single_step_breakpoints (lwp_info
*lwp
);
528 /* Fetch the possibly triggered data watchpoint info and store it in
531 On some archs, like x86, that use debug registers to set
532 watchpoints, it's possible that the way to know which watched
533 address trapped, is to check the register that is used to select
534 which address to watch. Problem is, between setting the watchpoint
535 and reading back which data address trapped, the user may change
536 the set of watchpoints, and, as a consequence, GDB changes the
537 debug registers in the inferior. To avoid reading back a stale
538 stopped-data-address when that happens, we cache in LP the fact
539 that a watchpoint trapped, and the corresponding data address, as
540 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
541 registers meanwhile, we have the cached data we can rely on. */
542 bool check_stopped_by_watchpoint (lwp_info
*child
);
544 /* Convert a native/host siginfo object, into/from the siginfo in the
545 layout of the inferiors' architecture. */
546 void siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
,
549 /* Add a process to the common process list, and set its private
551 process_info
*add_linux_process (int pid
, int attached
);
553 /* Add a new thread. */
554 lwp_info
*add_lwp (ptid_t ptid
);
556 /* Delete a thread. */
557 void delete_lwp (lwp_info
*lwp
);
559 public: /* Make this public because it's used from outside. */
560 /* Attach to an inferior process. Returns 0 on success, ERRNO on
562 int attach_lwp (ptid_t ptid
);
564 private: /* Back to private. */
565 /* Detach from LWP. */
566 void detach_one_lwp (lwp_info
*lwp
);
568 /* Detect zombie thread group leaders, and "exit" them. We can't
569 reap their exits until all other threads in the group have
571 void check_zombie_leaders ();
573 /* Convenience function that is called when the kernel reports an exit
574 event. This decides whether to report the event to GDB as a
575 process exit event, a thread exit event, or to suppress the
577 ptid_t
filter_exit_event (lwp_info
*event_child
,
578 target_waitstatus
*ourstatus
);
580 /* Returns true if THREAD is stopped in a jump pad, and we can't
581 move it out, because we need to report the stop event to GDB. For
582 example, if the user puts a breakpoint in the jump pad, it's
583 because she wants to debug it. */
584 bool stuck_in_jump_pad (thread_info
*thread
);
586 /* Convenience wrapper. Returns information about LWP's fast tracepoint
587 collection status. */
588 fast_tpoint_collect_result linux_fast_tracepoint_collecting
589 (lwp_info
*lwp
, fast_tpoint_collect_status
*status
);
592 /* The architecture-specific "low" methods are listed below. */
594 /* Architecture-specific setup for the current thread. */
595 virtual void low_arch_setup () = 0;
597 /* Return false if we can fetch/store the register, true if we cannot
598 fetch/store the register. */
599 virtual bool low_cannot_fetch_register (int regno
) = 0;
601 virtual bool low_cannot_store_register (int regno
) = 0;
603 /* Hook to fetch a register in some non-standard way. Used for
604 example by backends that have read-only registers with hardcoded
605 values (e.g., IA64's gr0/fr0/fr1). Returns true if register
606 REGNO was supplied, false if not, and we should fallback to the
607 standard ptrace methods. */
608 virtual bool low_fetch_register (regcache
*regcache
, int regno
);
610 /* Return true if breakpoints are supported. Such targets must
611 implement the GET_PC and SET_PC methods. */
612 virtual bool low_supports_breakpoints ();
614 virtual CORE_ADDR
low_get_pc (regcache
*regcache
);
616 virtual void low_set_pc (regcache
*regcache
, CORE_ADDR newpc
);
618 /* Find the next possible PCs after the current instruction executes.
619 Targets that override this method should also override
620 'supports_software_single_step' to return true. */
621 virtual std::vector
<CORE_ADDR
> low_get_next_pcs (regcache
*regcache
);
623 /* Return true if there is a breakpoint at PC. */
624 virtual bool low_breakpoint_at (CORE_ADDR pc
) = 0;
626 /* Breakpoint and watchpoint related functions. See target.h for
628 virtual int low_insert_point (raw_bkpt_type type
, CORE_ADDR addr
,
629 int size
, raw_breakpoint
*bp
);
631 virtual int low_remove_point (raw_bkpt_type type
, CORE_ADDR addr
,
632 int size
, raw_breakpoint
*bp
);
634 virtual bool low_stopped_by_watchpoint ();
636 virtual CORE_ADDR
low_stopped_data_address ();
638 /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
639 for registers smaller than an xfer unit). */
640 virtual void low_collect_ptrace_register (regcache
*regcache
, int regno
,
643 virtual void low_supply_ptrace_register (regcache
*regcache
, int regno
,
646 /* Hook to convert from target format to ptrace format and back.
647 Returns true if any conversion was done; false otherwise.
648 If DIRECTION is 1, then copy from INF to NATIVE.
649 If DIRECTION is 0, copy from NATIVE to INF. */
650 virtual bool low_siginfo_fixup (siginfo_t
*native
, gdb_byte
*inf
,
653 /* Hook to call when a new process is created or attached to.
654 If extra per-process architecture-specific data is needed,
656 virtual arch_process_info
*low_new_process ();
658 /* Hook to call when a process is being deleted. If extra per-process
659 architecture-specific data is needed, delete it here. */
660 virtual void low_delete_process (arch_process_info
*info
);
662 /* Hook to call when a new thread is detected.
663 If extra per-thread architecture-specific data is needed,
665 virtual void low_new_thread (lwp_info
*);
667 /* Hook to call when a thread is being deleted. If extra per-thread
668 architecture-specific data is needed, delete it here. */
669 virtual void low_delete_thread (arch_lwp_info
*);
671 /* Hook to call, if any, when a new fork is attached. */
672 virtual void low_new_fork (process_info
*parent
, process_info
*child
);
674 /* Hook to call prior to resuming a thread. */
675 virtual void low_prepare_to_resume (lwp_info
*lwp
);
677 /* Fill ADDRP with the thread area address of LWPID. Returns 0 on
678 success, -1 on failure. */
679 virtual int low_get_thread_area (int lwpid
, CORE_ADDR
*addrp
);
681 /* How many bytes the PC should be decremented after a break. */
682 virtual int low_decr_pc_after_break ();
685 extern linux_process_target
*the_linux_target
;
687 #define get_thread_lwp(thr) ((struct lwp_info *) (thread_target_data (thr)))
688 #define get_lwp_thread(lwp) ((lwp)->thread)
690 /* This struct is recorded in the target_data field of struct thread_info.
692 On linux ``all_threads'' is keyed by the LWP ID, which we use as the
693 GDB protocol representation of the thread ID. Threads also have
694 a "process ID" (poorly named) which is (presently) the same as the
697 There is also ``all_processes'' is keyed by the "overall process ID",
698 which GNU/Linux calls tgid, "thread group ID". */
702 /* Backlink to the parent object. */
703 struct thread_info
*thread
;
705 /* If this flag is set, the next SIGSTOP will be ignored (the
706 process will be immediately resumed). This means that either we
707 sent the SIGSTOP to it ourselves and got some other pending event
708 (so the SIGSTOP is still pending), or that we stopped the
709 inferior implicitly via PTRACE_ATTACH and have not waited for it
713 /* When this is true, we shall not try to resume this thread, even
714 if last_resume_kind isn't resume_stop. */
717 /* If this flag is set, the lwp is known to be stopped right now (stop
718 event already received in a wait()). */
721 /* Signal whether we are in a SYSCALL_ENTRY or
722 in a SYSCALL_RETURN event.
724 - TARGET_WAITKIND_SYSCALL_ENTRY
725 - TARGET_WAITKIND_SYSCALL_RETURN */
726 enum target_waitkind syscall_state
;
728 /* When stopped is set, the last wait status recorded for this lwp. */
731 /* If WAITSTATUS->KIND != TARGET_WAITKIND_IGNORE, the waitstatus for
732 this LWP's last event, to pass to GDB without any further
733 processing. This is used to store extended ptrace event
734 information or exit status until it can be reported to GDB. */
735 struct target_waitstatus waitstatus
;
737 /* A pointer to the fork child/parent relative. Valid only while
738 the parent fork event is not reported to higher layers. Used to
739 avoid wildcard vCont actions resuming a fork child before GDB is
740 notified about the parent's fork event. */
741 struct lwp_info
*fork_relative
;
743 /* When stopped is set, this is where the lwp last stopped, with
744 decr_pc_after_break already accounted for. If the LWP is
745 running, this is the address at which the lwp was resumed. */
748 /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
750 int status_pending_p
;
753 /* The reason the LWP last stopped, if we need to track it
754 (breakpoint, watchpoint, etc.) */
755 enum target_stop_reason stop_reason
;
757 /* On architectures where it is possible to know the data address of
758 a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
759 contains such data address. Only valid if STOPPED_BY_WATCHPOINT
761 CORE_ADDR stopped_data_address
;
763 /* If this is non-zero, it is a breakpoint to be reinserted at our next
764 stop (SIGTRAP stops only). */
765 CORE_ADDR bp_reinsert
;
767 /* If this flag is set, the last continue operation at the ptrace
768 level on this process was a single-step. */
771 /* Range to single step within. This is a copy of the step range
772 passed along the last resume request. See 'struct
774 CORE_ADDR step_range_start
; /* Inclusive */
775 CORE_ADDR step_range_end
; /* Exclusive */
777 /* If this flag is set, we need to set the event request flags the
778 next time we see this LWP stop. */
779 int must_set_ptrace_flags
;
781 /* If this is non-zero, it points to a chain of signals which need to
782 be delivered to this process. */
783 struct pending_signals
*pending_signals
;
785 /* A link used when resuming. It is initialized from the resume request,
786 and then processed and cleared in linux_resume_one_lwp. */
787 struct thread_resume
*resume
;
789 /* Information bout this lwp's fast tracepoint collection status (is it
790 currently stopped in the jump pad, and if so, before or at/after the
791 relocated instruction). Normally, we won't care about this, but we will
792 if a signal arrives to this lwp while it is collecting. */
793 fast_tpoint_collect_result collecting_fast_tracepoint
;
795 /* If this is non-zero, it points to a chain of signals which need
796 to be reported to GDB. These were deferred because the thread
797 was doing a fast tracepoint collect when they arrived. */
798 struct pending_signals
*pending_signals_to_report
;
800 /* When collecting_fast_tracepoint is first found to be 1, we insert
801 a exit-jump-pad-quickly breakpoint. This is it. */
802 struct breakpoint
*exit_jump_pad_bkpt
;
806 /* The thread handle, used for e.g. TLS access. Only valid if
807 THREAD_KNOWN is set. */
810 /* The pthread_t handle. */
811 thread_t thread_handle
;
814 /* Arch-specific additions. */
815 struct arch_lwp_info
*arch_private
;
818 int linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
);
820 /* Attach to PTID. Returns 0 on success, non-zero otherwise (an
822 int linux_attach_lwp (ptid_t ptid
);
824 struct lwp_info
*find_lwp_pid (ptid_t ptid
);
825 /* For linux_stop_lwp see nat/linux-nat.h. */
827 #ifdef HAVE_LINUX_REGSETS
828 void initialize_regsets_info (struct regsets_info
*regsets_info
);
831 void initialize_low_arch (void);
833 void linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
);
834 CORE_ADDR
linux_get_pc_32bit (struct regcache
*regcache
);
836 void linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
);
837 CORE_ADDR
linux_get_pc_64bit (struct regcache
*regcache
);
839 /* From thread-db.c */
840 int thread_db_init (void);
841 void thread_db_detach (struct process_info
*);
842 void thread_db_mourn (struct process_info
*);
843 int thread_db_handle_monitor_command (char *);
844 int thread_db_get_tls_address (struct thread_info
*thread
, CORE_ADDR offset
,
845 CORE_ADDR load_module
, CORE_ADDR
*address
);
846 int thread_db_look_up_one_symbol (const char *name
, CORE_ADDR
*addrp
);
848 /* Called from linux-low.c when a clone event is detected. Upon entry,
849 both the clone and the parent should be stopped. This function does
850 whatever is required have the clone under thread_db's control. */
852 void thread_db_notice_clone (struct thread_info
*parent_thr
, ptid_t child_ptid
);
854 bool thread_db_thread_handle (ptid_t ptid
, gdb_byte
**handle
, int *handle_len
);
856 extern int have_ptrace_getregset
;
858 /* Search for the value with type MATCH in the auxv vector with
859 entries of length WORDSIZE bytes. If found, store the value in
860 *VALP and return 1. If not found or if there is an error, return
863 int linux_get_auxv (int wordsize
, CORE_ADDR match
,
866 /* Fetch the AT_HWCAP entry from the auxv vector, where entries are length
867 WORDSIZE. If no entry was found, return zero. */
869 CORE_ADDR
linux_get_hwcap (int wordsize
);
871 /* Fetch the AT_HWCAP2 entry from the auxv vector, where entries are length
872 WORDSIZE. If no entry was found, return zero. */
874 CORE_ADDR
linux_get_hwcap2 (int wordsize
);
876 #endif /* GDBSERVER_LINUX_LOW_H */