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 /* See target.h for details. */
135 int (*breakpoint_kind_from_pc
) (CORE_ADDR
*pcptr
);
137 /* See target.h for details. */
138 const gdb_byte
*(*sw_breakpoint_from_kind
) (int kind
, int *size
);
140 /* Find the next possible PCs after the current instruction executes. */
141 std::vector
<CORE_ADDR
> (*get_next_pcs
) (struct regcache
*regcache
);
143 int decr_pc_after_break
;
144 int (*breakpoint_at
) (CORE_ADDR pc
);
146 /* Breakpoint and watchpoint related functions. See target.h for
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
);
154 int (*stopped_by_watchpoint
) (void);
155 CORE_ADDR (*stopped_data_address
) (void);
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
);
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
);
170 /* Hook to call when a new process is created or attached to.
171 If extra per-process architecture-specific data is needed,
173 struct arch_process_info
* (*new_process
) (void);
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
);
179 /* Hook to call when a new thread is detected.
180 If extra per-thread architecture-specific data is needed,
182 void (*new_thread
) (struct lwp_info
*);
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
*);
188 /* Hook to call, if any, when a new fork is attached. */
189 void (*new_fork
) (struct process_info
*parent
, struct process_info
*child
);
191 /* Hook to call prior to resuming a thread. */
192 void (*prepare_to_resume
) (struct lwp_info
*);
194 /* Hook to support target specific qSupported. */
195 void (*process_qsupported
) (char **, int count
);
197 /* Returns true if the low target supports tracepoints. */
198 int (*supports_tracepoints
) (void);
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
);
204 /* Install a fast tracepoint jump pad. See target.h for
206 int (*install_fast_tracepoint_jump_pad
) (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
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
,
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);
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);
227 /* Returns true if the low target supports range stepping. */
228 int (*supports_range_stepping
) (void);
231 int (*breakpoint_kind_from_current_state
) (CORE_ADDR
*pcptr
);
234 int (*supports_hardware_single_step
) (void);
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
);
241 int (*get_ipa_tdesc_idx
) (void);
244 extern struct linux_target_ops the_low_target
;
246 /* Target ops definitions for a Linux target. */
248 class linux_process_target
: public process_stratum_target
252 int create_inferior (const char *program
,
253 const std::vector
<char *> &program_args
) override
;
255 void post_create_inferior () override
;
257 int attach (unsigned long pid
) override
;
259 int kill (process_info
*proc
) override
;
261 int detach (process_info
*proc
) override
;
263 void mourn (process_info
*proc
) override
;
265 void join (int pid
) override
;
267 bool thread_alive (ptid_t pid
) override
;
269 void resume (thread_resume
*resume_info
, size_t n
) override
;
271 ptid_t
wait (ptid_t ptid
, target_waitstatus
*status
,
272 int options
) override
;
274 void fetch_registers (regcache
*regcache
, int regno
) override
;
276 void store_registers (regcache
*regcache
, int regno
) override
;
278 int prepare_to_access_memory () override
;
280 void done_accessing_memory () override
;
282 int read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
,
285 int write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
,
288 void look_up_symbols () override
;
290 void request_interrupt () override
;
292 bool supports_read_auxv () override
;
294 int read_auxv (CORE_ADDR offset
, unsigned char *myaddr
,
295 unsigned int len
) override
;
297 bool supports_z_point_type (char z_type
) override
;
299 int insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
300 int size
, raw_breakpoint
*bp
) override
;
302 int remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
303 int size
, raw_breakpoint
*bp
) override
;
305 bool stopped_by_sw_breakpoint () override
;
307 bool supports_stopped_by_sw_breakpoint () override
;
309 bool stopped_by_hw_breakpoint () override
;
311 bool supports_stopped_by_hw_breakpoint () override
;
313 bool supports_hardware_single_step () override
;
315 bool stopped_by_watchpoint () override
;
317 CORE_ADDR
stopped_data_address () override
;
319 bool supports_read_offsets () override
;
321 int read_offsets (CORE_ADDR
*text
, CORE_ADDR
*data
) override
;
323 bool supports_get_tls_address () override
;
325 int get_tls_address (thread_info
*thread
, CORE_ADDR offset
,
326 CORE_ADDR load_module
, CORE_ADDR
*address
) override
;
328 bool supports_qxfer_osdata () override
;
330 int qxfer_osdata (const char *annex
, unsigned char *readbuf
,
331 unsigned const char *writebuf
,
332 CORE_ADDR offset
, int len
) override
;
334 bool supports_qxfer_siginfo () override
;
336 int qxfer_siginfo (const char *annex
, unsigned char *readbuf
,
337 unsigned const char *writebuf
,
338 CORE_ADDR offset
, int len
) override
;
340 bool supports_non_stop () override
;
342 bool async (bool enable
) override
;
344 int start_non_stop (bool enable
) override
;
346 bool supports_multi_process () override
;
348 bool supports_fork_events () override
;
350 bool supports_vfork_events () override
;
352 bool supports_exec_events () override
;
354 void handle_new_gdb_connection () override
;
356 int handle_monitor_command (char *mon
) override
;
358 int core_of_thread (ptid_t ptid
) override
;
360 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
361 bool supports_read_loadmap () override
;
363 int read_loadmap (const char *annex
, CORE_ADDR offset
,
364 unsigned char *myaddr
, unsigned int len
) override
;
367 void process_qsupported (char **features
, int count
) override
;
369 bool supports_tracepoints () override
;
371 CORE_ADDR
read_pc (regcache
*regcache
) override
;
373 void write_pc (regcache
*regcache
, CORE_ADDR pc
) override
;
375 bool supports_thread_stopped () override
;
377 bool thread_stopped (thread_info
*thread
) override
;
379 void pause_all (bool freeze
) override
;
381 void unpause_all (bool unfreeze
) override
;
383 void stabilize_threads () override
;
385 bool supports_fast_tracepoints () override
;
387 int install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
,
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
,
401 int get_min_fast_tracepoint_insn_len () override
;
403 struct emit_ops
*emit_ops () override
;
405 bool supports_disable_randomization () override
;
407 bool supports_qxfer_libraries_svr4 () override
;
409 int qxfer_libraries_svr4 (const char *annex
,
410 unsigned char *readbuf
,
411 unsigned const char *writebuf
,
412 CORE_ADDR offset
, int len
) override
;
414 bool supports_agent () override
;
416 #ifdef HAVE_LINUX_BTRACE
417 btrace_target_info
*enable_btrace (ptid_t ptid
,
418 const btrace_config
*conf
) override
;
420 int disable_btrace (btrace_target_info
*tinfo
) override
;
422 int read_btrace (btrace_target_info
*tinfo
, buffer
*buf
,
423 enum btrace_read_type type
) override
;
425 int read_btrace_conf (const btrace_target_info
*tinfo
,
426 buffer
*buf
) override
;
429 bool supports_range_stepping () override
;
431 bool supports_pid_to_exec_file () override
;
433 char *pid_to_exec_file (int pid
) override
;
435 bool supports_multifs () override
;
437 int multifs_open (int pid
, const char *filename
, int flags
,
438 mode_t mode
) override
;
440 int multifs_unlink (int pid
, const char *filename
) override
;
442 ssize_t
multifs_readlink (int pid
, const char *filename
, char *buf
,
443 size_t bufsiz
) override
;
445 int breakpoint_kind_from_pc (CORE_ADDR
*pcptr
) override
;
447 const gdb_byte
*sw_breakpoint_from_kind (int kind
, int *size
) override
;
449 int breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
) override
;
451 const char *thread_name (ptid_t thread
) override
;
454 bool thread_handle (ptid_t ptid
, gdb_byte
**handle
,
455 int *handle_len
) override
;
458 bool supports_software_single_step () override
;
460 bool supports_catch_syscall () override
;
462 int get_ipa_tdesc_idx () override
;
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;
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
);
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
480 lwp_info
*filter_event (int lwpid
, int wstat
);
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
);
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
);
502 /* Wait for all children to stop for the SIGSTOPs we just queued. */
503 void wait_for_sigstop ();
505 /* Wait for process, returns status. */
506 ptid_t
wait_1 (ptid_t ptid
, target_waitstatus
*ourstatus
,
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,
512 void stop_all_lwps (int suspend
, lwp_info
*except
);
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
);
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
);
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
535 void complete_ongoing_step_over ();
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 ();
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
);
548 /* Move THREAD out of the jump pad. */
549 void move_out_of_jump_pad (thread_info
*thread
);
551 /* Call low_arch_setup on THREAD. */
552 void arch_setup_thread (thread_info
*thread
);
554 #ifdef HAVE_LINUX_USRREGS
555 /* Fetch one register. */
556 void fetch_register (const usrregs_info
*usrregs
, regcache
*regcache
,
559 /* Store one register. */
560 void store_register (const usrregs_info
*usrregs
, regcache
*regcache
,
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
);
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
);
580 /* Return the PC as read from the regcache of LWP, without any
582 CORE_ADDR
get_pc (lwp_info
*lwp
);
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
);
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
,
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
);
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.
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
);
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
615 For threads which we aren't explicitly told otherwise, we preserve
616 the stepping flag; this is used for stepping over gdbserver-placed
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
);
625 /* Return true if this lwp has an interesting status pending. */
626 bool status_pending_p_callback (thread_info
*thread
, ptid_t ptid
);
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
);
632 /* Unsuspend THREAD, except EXCEPT, and proceed. */
633 void unsuspend_and_proceed_one_lwp (thread_info
*thread
, lwp_info
*except
);
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
638 bool thread_still_has_status_pending (thread_info
*thread
);
640 /* Return true if this lwp is to-be-resumed and has an interesting
642 bool resume_status_pending (thread_info
*thread
);
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
);
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
);
655 /* Install breakpoints for software single stepping. */
656 void install_software_single_step_breakpoints (lwp_info
*lwp
);
659 /* The architecture-specific "low" methods are listed below. */
661 /* Architecture-specific setup for the current thread. */
662 virtual void low_arch_setup () = 0;
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;
668 virtual bool low_cannot_store_register (int regno
) = 0;
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
);
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 ();
681 virtual CORE_ADDR
low_get_pc (regcache
*regcache
);
683 virtual void low_set_pc (regcache
*regcache
, CORE_ADDR newpc
);
686 extern linux_process_target
*the_linux_target
;
688 #define get_thread_lwp(thr) ((struct lwp_info *) (thread_target_data (thr)))
689 #define get_lwp_thread(lwp) ((lwp)->thread)
691 /* This struct is recorded in the target_data field of struct thread_info.
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
698 There is also ``all_processes'' is keyed by the "overall process ID",
699 which GNU/Linux calls tgid, "thread group ID". */
703 /* Backlink to the parent object. */
704 struct thread_info
*thread
;
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
714 /* When this is true, we shall not try to resume this thread, even
715 if last_resume_kind isn't resume_stop. */
718 /* If this flag is set, the lwp is known to be stopped right now (stop
719 event already received in a wait()). */
722 /* Signal whether we are in a SYSCALL_ENTRY or
723 in a SYSCALL_RETURN event.
725 - TARGET_WAITKIND_SYSCALL_ENTRY
726 - TARGET_WAITKIND_SYSCALL_RETURN */
727 enum target_waitkind syscall_state
;
729 /* When stopped is set, the last wait status recorded for this lwp. */
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
;
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
;
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. */
749 /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
751 int status_pending_p
;
754 /* The reason the LWP last stopped, if we need to track it
755 (breakpoint, watchpoint, etc.) */
756 enum target_stop_reason stop_reason
;
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
762 CORE_ADDR stopped_data_address
;
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
;
768 /* If this flag is set, the last continue operation at the ptrace
769 level on this process was a single-step. */
772 /* Range to single step within. This is a copy of the step range
773 passed along the last resume request. See 'struct
775 CORE_ADDR step_range_start
; /* Inclusive */
776 CORE_ADDR step_range_end
; /* Exclusive */
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
;
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
;
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
;
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
;
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
;
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
;
807 /* The thread handle, used for e.g. TLS access. Only valid if
808 THREAD_KNOWN is set. */
811 /* The pthread_t handle. */
812 thread_t thread_handle
;
815 /* Arch-specific additions. */
816 struct arch_lwp_info
*arch_private
;
819 int linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
);
821 /* Attach to PTID. Returns 0 on success, non-zero otherwise (an
823 int linux_attach_lwp (ptid_t ptid
);
825 struct lwp_info
*find_lwp_pid (ptid_t ptid
);
826 /* For linux_stop_lwp see nat/linux-nat.h. */
828 #ifdef HAVE_LINUX_REGSETS
829 void initialize_regsets_info (struct regsets_info
*regsets_info
);
832 void initialize_low_arch (void);
834 void linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
);
835 CORE_ADDR
linux_get_pc_32bit (struct regcache
*regcache
);
837 void linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
);
838 CORE_ADDR
linux_get_pc_64bit (struct regcache
*regcache
);
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
);
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. */
853 void thread_db_notice_clone (struct thread_info
*parent_thr
, ptid_t child_ptid
);
855 bool thread_db_thread_handle (ptid_t ptid
, gdb_byte
**handle
, int *handle_len
);
857 extern int have_ptrace_getregset
;
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
864 int linux_get_auxv (int wordsize
, CORE_ADDR match
,
867 /* Fetch the AT_HWCAP entry from the auxv vector, where entries are length
868 WORDSIZE. If no entry was found, return zero. */
870 CORE_ADDR
linux_get_hwcap (int wordsize
);
872 /* Fetch the AT_HWCAP2 entry from the auxv vector, where entries are length
873 WORDSIZE. If no entry was found, return zero. */
875 CORE_ADDR
linux_get_hwcap2 (int wordsize
);
877 #endif /* GDBSERVER_LINUX_LOW_H */