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 CORE_ADDR (*get_pc
) (struct regcache
*regcache
);
135 void (*set_pc
) (struct regcache
*regcache
, CORE_ADDR newpc
);
137 /* See target.h for details. */
138 int (*breakpoint_kind_from_pc
) (CORE_ADDR
*pcptr
);
140 /* See target.h for details. */
141 const gdb_byte
*(*sw_breakpoint_from_kind
) (int kind
, int *size
);
143 /* Find the next possible PCs after the current instruction executes. */
144 std::vector
<CORE_ADDR
> (*get_next_pcs
) (struct regcache
*regcache
);
146 int decr_pc_after_break
;
147 int (*breakpoint_at
) (CORE_ADDR pc
);
149 /* Breakpoint and watchpoint related functions. See target.h for
151 int (*supports_z_point_type
) (char z_type
);
152 int (*insert_point
) (enum raw_bkpt_type type
, CORE_ADDR addr
,
153 int size
, struct raw_breakpoint
*bp
);
154 int (*remove_point
) (enum raw_bkpt_type type
, CORE_ADDR addr
,
155 int size
, struct raw_breakpoint
*bp
);
157 int (*stopped_by_watchpoint
) (void);
158 CORE_ADDR (*stopped_data_address
) (void);
160 /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
161 for registers smaller than an xfer unit). */
162 void (*collect_ptrace_register
) (struct regcache
*regcache
,
163 int regno
, char *buf
);
164 void (*supply_ptrace_register
) (struct regcache
*regcache
,
165 int regno
, const char *buf
);
167 /* Hook to convert from target format to ptrace format and back.
168 Returns true if any conversion was done; false otherwise.
169 If DIRECTION is 1, then copy from INF to NATIVE.
170 If DIRECTION is 0, copy from NATIVE to INF. */
171 int (*siginfo_fixup
) (siginfo_t
*native
, gdb_byte
*inf
, int direction
);
173 /* Hook to call when a new process is created or attached to.
174 If extra per-process architecture-specific data is needed,
176 struct arch_process_info
* (*new_process
) (void);
178 /* Hook to call when a process is being deleted. If extra per-process
179 architecture-specific data is needed, delete it here. */
180 void (*delete_process
) (struct arch_process_info
*info
);
182 /* Hook to call when a new thread is detected.
183 If extra per-thread architecture-specific data is needed,
185 void (*new_thread
) (struct lwp_info
*);
187 /* Hook to call when a thread is being deleted. If extra per-thread
188 architecture-specific data is needed, delete it here. */
189 void (*delete_thread
) (struct arch_lwp_info
*);
191 /* Hook to call, if any, when a new fork is attached. */
192 void (*new_fork
) (struct process_info
*parent
, struct process_info
*child
);
194 /* Hook to call prior to resuming a thread. */
195 void (*prepare_to_resume
) (struct lwp_info
*);
197 /* Hook to support target specific qSupported. */
198 void (*process_qsupported
) (char **, int count
);
200 /* Returns true if the low target supports tracepoints. */
201 int (*supports_tracepoints
) (void);
203 /* Fill ADDRP with the thread area address of LWPID. Returns 0 on
204 success, -1 on failure. */
205 int (*get_thread_area
) (int lwpid
, CORE_ADDR
*addrp
);
207 /* Install a fast tracepoint jump pad. See target.h for
209 int (*install_fast_tracepoint_jump_pad
) (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
213 CORE_ADDR
*jump_entry
,
214 CORE_ADDR
*trampoline
,
215 ULONGEST
*trampoline_size
,
216 unsigned char *jjump_pad_insn
,
217 ULONGEST
*jjump_pad_insn_size
,
218 CORE_ADDR
*adjusted_insn_addr
,
219 CORE_ADDR
*adjusted_insn_addr_end
,
222 /* Return the bytecode operations vector for the current inferior.
223 Returns NULL if bytecode compilation is not supported. */
224 struct emit_ops
*(*emit_ops
) (void);
226 /* Return the minimum length of an instruction that can be safely overwritten
227 for use as a fast tracepoint. */
228 int (*get_min_fast_tracepoint_insn_len
) (void);
230 /* Returns true if the low target supports range stepping. */
231 int (*supports_range_stepping
) (void);
234 int (*breakpoint_kind_from_current_state
) (CORE_ADDR
*pcptr
);
237 int (*supports_hardware_single_step
) (void);
239 /* Fill *SYSNO with the syscall nr trapped. Only to be called when
240 inferior is stopped due to SYSCALL_SIGTRAP. */
241 void (*get_syscall_trapinfo
) (struct regcache
*regcache
, int *sysno
);
244 int (*get_ipa_tdesc_idx
) (void);
247 extern struct linux_target_ops the_low_target
;
249 /* Target ops definitions for a Linux target. */
251 class linux_process_target
: public process_stratum_target
255 int create_inferior (const char *program
,
256 const std::vector
<char *> &program_args
) override
;
258 void post_create_inferior () override
;
260 int attach (unsigned long pid
) override
;
262 int kill (process_info
*proc
) override
;
264 int detach (process_info
*proc
) override
;
266 void mourn (process_info
*proc
) override
;
268 void join (int pid
) override
;
270 bool thread_alive (ptid_t pid
) override
;
272 void resume (thread_resume
*resume_info
, size_t n
) override
;
274 ptid_t
wait (ptid_t ptid
, target_waitstatus
*status
,
275 int options
) override
;
277 void fetch_registers (regcache
*regcache
, int regno
) override
;
279 void store_registers (regcache
*regcache
, int regno
) override
;
281 int prepare_to_access_memory () override
;
283 void done_accessing_memory () override
;
285 int read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
,
288 int write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
,
291 void look_up_symbols () override
;
293 void request_interrupt () override
;
295 bool supports_read_auxv () override
;
297 int read_auxv (CORE_ADDR offset
, unsigned char *myaddr
,
298 unsigned int len
) override
;
300 bool supports_z_point_type (char z_type
) override
;
302 int insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
303 int size
, raw_breakpoint
*bp
) override
;
305 int remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
306 int size
, raw_breakpoint
*bp
) override
;
308 bool stopped_by_sw_breakpoint () override
;
310 bool supports_stopped_by_sw_breakpoint () override
;
312 bool stopped_by_hw_breakpoint () override
;
314 bool supports_stopped_by_hw_breakpoint () override
;
316 bool supports_hardware_single_step () override
;
318 bool stopped_by_watchpoint () override
;
320 CORE_ADDR
stopped_data_address () override
;
322 bool supports_read_offsets () override
;
324 int read_offsets (CORE_ADDR
*text
, CORE_ADDR
*data
) override
;
326 bool supports_get_tls_address () override
;
328 int get_tls_address (thread_info
*thread
, CORE_ADDR offset
,
329 CORE_ADDR load_module
, CORE_ADDR
*address
) override
;
331 bool supports_qxfer_osdata () override
;
333 int qxfer_osdata (const char *annex
, unsigned char *readbuf
,
334 unsigned const char *writebuf
,
335 CORE_ADDR offset
, int len
) override
;
337 bool supports_qxfer_siginfo () override
;
339 int qxfer_siginfo (const char *annex
, unsigned char *readbuf
,
340 unsigned const char *writebuf
,
341 CORE_ADDR offset
, int len
) override
;
343 bool supports_non_stop () override
;
345 bool async (bool enable
) override
;
347 int start_non_stop (bool enable
) override
;
349 bool supports_multi_process () override
;
351 bool supports_fork_events () override
;
353 bool supports_vfork_events () override
;
355 bool supports_exec_events () override
;
357 void handle_new_gdb_connection () override
;
359 int handle_monitor_command (char *mon
) override
;
361 int core_of_thread (ptid_t ptid
) override
;
363 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
364 bool supports_read_loadmap () override
;
366 int read_loadmap (const char *annex
, CORE_ADDR offset
,
367 unsigned char *myaddr
, unsigned int len
) override
;
370 void process_qsupported (char **features
, int count
) override
;
372 bool supports_tracepoints () override
;
374 CORE_ADDR
read_pc (regcache
*regcache
) override
;
376 void write_pc (regcache
*regcache
, CORE_ADDR pc
) override
;
378 bool supports_thread_stopped () override
;
380 bool thread_stopped (thread_info
*thread
) override
;
382 void pause_all (bool freeze
) override
;
384 void unpause_all (bool unfreeze
) override
;
386 void stabilize_threads () override
;
388 bool supports_fast_tracepoints () override
;
390 int install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
,
395 CORE_ADDR
*jump_entry
,
396 CORE_ADDR
*trampoline
,
397 ULONGEST
*trampoline_size
,
398 unsigned char *jjump_pad_insn
,
399 ULONGEST
*jjump_pad_insn_size
,
400 CORE_ADDR
*adjusted_insn_addr
,
401 CORE_ADDR
*adjusted_insn_addr_end
,
404 int get_min_fast_tracepoint_insn_len () override
;
406 struct emit_ops
*emit_ops () override
;
408 bool supports_disable_randomization () override
;
410 bool supports_qxfer_libraries_svr4 () override
;
412 int qxfer_libraries_svr4 (const char *annex
,
413 unsigned char *readbuf
,
414 unsigned const char *writebuf
,
415 CORE_ADDR offset
, int len
) override
;
417 bool supports_agent () override
;
419 #ifdef HAVE_LINUX_BTRACE
420 btrace_target_info
*enable_btrace (ptid_t ptid
,
421 const btrace_config
*conf
) override
;
423 int disable_btrace (btrace_target_info
*tinfo
) override
;
425 int read_btrace (btrace_target_info
*tinfo
, buffer
*buf
,
426 enum btrace_read_type type
) override
;
428 int read_btrace_conf (const btrace_target_info
*tinfo
,
429 buffer
*buf
) override
;
432 bool supports_range_stepping () override
;
434 bool supports_pid_to_exec_file () override
;
436 char *pid_to_exec_file (int pid
) override
;
438 bool supports_multifs () override
;
440 int multifs_open (int pid
, const char *filename
, int flags
,
441 mode_t mode
) override
;
443 int multifs_unlink (int pid
, const char *filename
) override
;
445 ssize_t
multifs_readlink (int pid
, const char *filename
, char *buf
,
446 size_t bufsiz
) override
;
448 int breakpoint_kind_from_pc (CORE_ADDR
*pcptr
) override
;
450 const gdb_byte
*sw_breakpoint_from_kind (int kind
, int *size
) override
;
452 int breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
) override
;
454 const char *thread_name (ptid_t thread
) override
;
457 bool thread_handle (ptid_t ptid
, gdb_byte
**handle
,
458 int *handle_len
) override
;
461 bool supports_software_single_step () override
;
463 bool supports_catch_syscall () override
;
465 int get_ipa_tdesc_idx () override
;
467 /* Return the information to access registers. This has public
468 visibility because proc-service uses it. */
469 virtual const regs_info
*get_regs_info () = 0;
473 /* Handle a GNU/Linux extended wait response. If we see a clone,
474 fork, or vfork event, we need to add the new LWP to our list
475 (and return 0 so as not to report the trap to higher layers).
476 If we see an exec event, we will modify ORIG_EVENT_LWP to point
477 to a new LWP representing the new program. */
478 int handle_extended_wait (lwp_info
**orig_event_lwp
, int wstat
);
480 /* Do low-level handling of the event, and check if we should go on
481 and pass it to caller code. Return the affected lwp if we are, or
483 lwp_info
*filter_event (int lwpid
, int wstat
);
485 /* Wait for an event from child(ren) WAIT_PTID, and return any that
486 match FILTER_PTID (leaving others pending). The PTIDs can be:
487 minus_one_ptid, to specify any child; a pid PTID, specifying all
488 lwps of a thread group; or a PTID representing a single lwp. Store
489 the stop status through the status pointer WSTAT. OPTIONS is
490 passed to the waitpid call. Return 0 if no event was found and
491 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
492 was found. Return the PID of the stopped child otherwise. */
493 int wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
494 int *wstatp
, int options
);
496 /* Wait for an event from child(ren) PTID. PTIDs can be:
497 minus_one_ptid, to specify any child; a pid PTID, specifying all
498 lwps of a thread group; or a PTID representing a single lwp. Store
499 the stop status through the status pointer WSTAT. OPTIONS is
500 passed to the waitpid call. Return 0 if no event was found and
501 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
502 was found. Return the PID of the stopped child otherwise. */
503 int wait_for_event (ptid_t ptid
, int *wstatp
, int options
);
505 /* Wait for all children to stop for the SIGSTOPs we just queued. */
506 void wait_for_sigstop ();
508 /* Wait for process, returns status. */
509 ptid_t
wait_1 (ptid_t ptid
, target_waitstatus
*ourstatus
,
512 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
513 If SUSPEND, then also increase the suspend count of every LWP,
515 void stop_all_lwps (int suspend
, lwp_info
*except
);
517 /* Stopped LWPs that the client wanted to be running, that don't have
518 pending statuses, are set to run again, except for EXCEPT, if not
519 NULL. This undoes a stop_all_lwps call. */
520 void unstop_all_lwps (int unsuspend
, lwp_info
*except
);
522 /* Start a step-over operation on LWP. When LWP stopped at a
523 breakpoint, to make progress, we need to remove the breakpoint out
524 of the way. If we let other threads run while we do that, they may
525 pass by the breakpoint location and miss hitting it. To avoid
526 that, a step-over momentarily stops all threads while LWP is
527 single-stepped by either hardware or software while the breakpoint
528 is temporarily uninserted from the inferior. When the single-step
529 finishes, we reinsert the breakpoint, and let all threads that are
530 supposed to be running, run again. */
531 void start_step_over (lwp_info
*lwp
);
533 /* If there's a step over in progress, wait until all threads stop
534 (that is, until the stepping thread finishes its step), and
535 unsuspend all lwps. The stepping thread ends with its status
536 pending, which is processed later when we get back to processing
538 void complete_ongoing_step_over ();
540 /* When we finish a step-over, set threads running again. If there's
541 another thread that may need a step-over, now's the time to start
542 it. Eventually, we'll move all threads past their breakpoints. */
543 void proceed_all_lwps ();
545 /* The reason we resume in the caller, is because we want to be able
546 to pass lwp->status_pending as WSTAT, and we need to clear
547 status_pending_p before resuming, otherwise, resume_one_lwp
548 refuses to resume. */
549 bool maybe_move_out_of_jump_pad (lwp_info
*lwp
, int *wstat
);
551 /* Move THREAD out of the jump pad. */
552 void move_out_of_jump_pad (thread_info
*thread
);
554 /* Call low_arch_setup on THREAD. */
555 void arch_setup_thread (thread_info
*thread
);
557 #ifdef HAVE_LINUX_USRREGS
558 /* Fetch one register. */
559 void fetch_register (const usrregs_info
*usrregs
, regcache
*regcache
,
562 /* Store one register. */
563 void store_register (const usrregs_info
*usrregs
, regcache
*regcache
,
567 /* Fetch all registers, or just one, from the child process.
568 If REGNO is -1, do this for all registers, skipping any that are
569 assumed to have been retrieved by regsets_fetch_inferior_registers,
570 unless ALL is non-zero.
571 Otherwise, REGNO specifies which register (so we can save time). */
572 void usr_fetch_inferior_registers (const regs_info
*regs_info
,
573 regcache
*regcache
, int regno
, int all
);
575 /* Store our register values back into the inferior.
576 If REGNO is -1, do this for all registers, skipping any that are
577 assumed to have been saved by regsets_store_inferior_registers,
578 unless ALL is non-zero.
579 Otherwise, REGNO specifies which register (so we can save time). */
580 void usr_store_inferior_registers (const regs_info
*regs_info
,
581 regcache
*regcache
, int regno
, int all
);
583 /* Return the PC as read from the regcache of LWP, without any
585 CORE_ADDR
get_pc (lwp_info
*lwp
);
587 /* Called when the LWP stopped for a signal/trap. If it stopped for a
588 trap check what caused it (breakpoint, watchpoint, trace, etc.),
589 and save the result in the LWP's stop_reason field. If it stopped
590 for a breakpoint, decrement the PC if necessary on the lwp's
591 architecture. Returns true if we now have the LWP's stop PC. */
592 bool save_stop_reason (lwp_info
*lwp
);
594 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
595 SIGNAL is nonzero, give it that signal. */
596 void resume_one_lwp_throw (lwp_info
*lwp
, int step
, int signal
,
599 /* Like resume_one_lwp_throw, but no error is thrown if the LWP
600 disappears while we try to resume it. */
601 void resume_one_lwp (lwp_info
*lwp
, int step
, int signal
, siginfo_t
*info
);
603 /* This function is called once per thread. We check the thread's
604 last resume request, which will tell us whether to resume, step, or
605 leave the thread stopped. Any signal the client requested to be
606 delivered has already been enqueued at this point.
608 If any thread that GDB wants running is stopped at an internal
609 breakpoint that needs stepping over, we start a step-over operation
610 on that particular thread, and leave all others stopped. */
611 void proceed_one_lwp (thread_info
*thread
, lwp_info
*except
);
613 /* This function is called once per thread. We check the thread's
614 resume request, which will tell us whether to resume, step, or
615 leave the thread stopped; and what signal, if any, it should be
618 For threads which we aren't explicitly told otherwise, we preserve
619 the stepping flag; this is used for stepping over gdbserver-placed
622 If pending_flags was set in any thread, we queue any needed
623 signals, since we won't actually resume. We already have a pending
624 event to report, so we don't need to preserve any step requests;
625 they should be re-issued if necessary. */
626 void resume_one_thread (thread_info
*thread
, bool leave_all_stopped
);
628 /* Return true if this lwp has an interesting status pending. */
629 bool status_pending_p_callback (thread_info
*thread
, ptid_t ptid
);
631 /* Resume LWPs that are currently stopped without any pending status
632 to report, but are resumed from the core's perspective. */
633 void resume_stopped_resumed_lwps (thread_info
*thread
);
635 /* Unsuspend THREAD, except EXCEPT, and proceed. */
636 void unsuspend_and_proceed_one_lwp (thread_info
*thread
, lwp_info
*except
);
638 /* Return true if this lwp still has an interesting status pending.
639 If not (e.g., it had stopped for a breakpoint that is gone), return
641 bool thread_still_has_status_pending (thread_info
*thread
);
643 /* Return true if this lwp is to-be-resumed and has an interesting
645 bool resume_status_pending (thread_info
*thread
);
647 /* Return true if this lwp that GDB wants running is stopped at an
648 internal breakpoint that we need to step over. It assumes that
649 any required STOP_PC adjustment has already been propagated to
650 the inferior's regcache. */
651 bool thread_needs_step_over (thread_info
*thread
);
653 /* Single step via hardware or software single step.
654 Return 1 if hardware single stepping, 0 if software single stepping
655 or can't single step. */
656 int single_step (lwp_info
* lwp
);
658 /* Install breakpoints for software single stepping. */
659 void install_software_single_step_breakpoints (lwp_info
*lwp
);
662 /* The architecture-specific "low" methods are listed below. */
664 /* Architecture-specific setup for the current thread. */
665 virtual void low_arch_setup () = 0;
667 /* Return false if we can fetch/store the register, true if we cannot
668 fetch/store the register. */
669 virtual bool low_cannot_fetch_register (int regno
) = 0;
671 virtual bool low_cannot_store_register (int regno
) = 0;
673 /* Hook to fetch a register in some non-standard way. Used for
674 example by backends that have read-only registers with hardcoded
675 values (e.g., IA64's gr0/fr0/fr1). Returns true if register
676 REGNO was supplied, false if not, and we should fallback to the
677 standard ptrace methods. */
678 virtual bool low_fetch_register (regcache
*regcache
, int regno
);
681 extern linux_process_target
*the_linux_target
;
683 #define get_thread_lwp(thr) ((struct lwp_info *) (thread_target_data (thr)))
684 #define get_lwp_thread(lwp) ((lwp)->thread)
686 /* This struct is recorded in the target_data field of struct thread_info.
688 On linux ``all_threads'' is keyed by the LWP ID, which we use as the
689 GDB protocol representation of the thread ID. Threads also have
690 a "process ID" (poorly named) which is (presently) the same as the
693 There is also ``all_processes'' is keyed by the "overall process ID",
694 which GNU/Linux calls tgid, "thread group ID". */
698 /* Backlink to the parent object. */
699 struct thread_info
*thread
;
701 /* If this flag is set, the next SIGSTOP will be ignored (the
702 process will be immediately resumed). This means that either we
703 sent the SIGSTOP to it ourselves and got some other pending event
704 (so the SIGSTOP is still pending), or that we stopped the
705 inferior implicitly via PTRACE_ATTACH and have not waited for it
709 /* When this is true, we shall not try to resume this thread, even
710 if last_resume_kind isn't resume_stop. */
713 /* If this flag is set, the lwp is known to be stopped right now (stop
714 event already received in a wait()). */
717 /* Signal whether we are in a SYSCALL_ENTRY or
718 in a SYSCALL_RETURN event.
720 - TARGET_WAITKIND_SYSCALL_ENTRY
721 - TARGET_WAITKIND_SYSCALL_RETURN */
722 enum target_waitkind syscall_state
;
724 /* When stopped is set, the last wait status recorded for this lwp. */
727 /* If WAITSTATUS->KIND != TARGET_WAITKIND_IGNORE, the waitstatus for
728 this LWP's last event, to pass to GDB without any further
729 processing. This is used to store extended ptrace event
730 information or exit status until it can be reported to GDB. */
731 struct target_waitstatus waitstatus
;
733 /* A pointer to the fork child/parent relative. Valid only while
734 the parent fork event is not reported to higher layers. Used to
735 avoid wildcard vCont actions resuming a fork child before GDB is
736 notified about the parent's fork event. */
737 struct lwp_info
*fork_relative
;
739 /* When stopped is set, this is where the lwp last stopped, with
740 decr_pc_after_break already accounted for. If the LWP is
741 running, this is the address at which the lwp was resumed. */
744 /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
746 int status_pending_p
;
749 /* The reason the LWP last stopped, if we need to track it
750 (breakpoint, watchpoint, etc.) */
751 enum target_stop_reason stop_reason
;
753 /* On architectures where it is possible to know the data address of
754 a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
755 contains such data address. Only valid if STOPPED_BY_WATCHPOINT
757 CORE_ADDR stopped_data_address
;
759 /* If this is non-zero, it is a breakpoint to be reinserted at our next
760 stop (SIGTRAP stops only). */
761 CORE_ADDR bp_reinsert
;
763 /* If this flag is set, the last continue operation at the ptrace
764 level on this process was a single-step. */
767 /* Range to single step within. This is a copy of the step range
768 passed along the last resume request. See 'struct
770 CORE_ADDR step_range_start
; /* Inclusive */
771 CORE_ADDR step_range_end
; /* Exclusive */
773 /* If this flag is set, we need to set the event request flags the
774 next time we see this LWP stop. */
775 int must_set_ptrace_flags
;
777 /* If this is non-zero, it points to a chain of signals which need to
778 be delivered to this process. */
779 struct pending_signals
*pending_signals
;
781 /* A link used when resuming. It is initialized from the resume request,
782 and then processed and cleared in linux_resume_one_lwp. */
783 struct thread_resume
*resume
;
785 /* Information bout this lwp's fast tracepoint collection status (is it
786 currently stopped in the jump pad, and if so, before or at/after the
787 relocated instruction). Normally, we won't care about this, but we will
788 if a signal arrives to this lwp while it is collecting. */
789 fast_tpoint_collect_result collecting_fast_tracepoint
;
791 /* If this is non-zero, it points to a chain of signals which need
792 to be reported to GDB. These were deferred because the thread
793 was doing a fast tracepoint collect when they arrived. */
794 struct pending_signals
*pending_signals_to_report
;
796 /* When collecting_fast_tracepoint is first found to be 1, we insert
797 a exit-jump-pad-quickly breakpoint. This is it. */
798 struct breakpoint
*exit_jump_pad_bkpt
;
802 /* The thread handle, used for e.g. TLS access. Only valid if
803 THREAD_KNOWN is set. */
806 /* The pthread_t handle. */
807 thread_t thread_handle
;
810 /* Arch-specific additions. */
811 struct arch_lwp_info
*arch_private
;
814 int linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
);
816 /* Attach to PTID. Returns 0 on success, non-zero otherwise (an
818 int linux_attach_lwp (ptid_t ptid
);
820 struct lwp_info
*find_lwp_pid (ptid_t ptid
);
821 /* For linux_stop_lwp see nat/linux-nat.h. */
823 #ifdef HAVE_LINUX_REGSETS
824 void initialize_regsets_info (struct regsets_info
*regsets_info
);
827 void initialize_low_arch (void);
829 void linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
);
830 CORE_ADDR
linux_get_pc_32bit (struct regcache
*regcache
);
832 void linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
);
833 CORE_ADDR
linux_get_pc_64bit (struct regcache
*regcache
);
835 /* From thread-db.c */
836 int thread_db_init (void);
837 void thread_db_detach (struct process_info
*);
838 void thread_db_mourn (struct process_info
*);
839 int thread_db_handle_monitor_command (char *);
840 int thread_db_get_tls_address (struct thread_info
*thread
, CORE_ADDR offset
,
841 CORE_ADDR load_module
, CORE_ADDR
*address
);
842 int thread_db_look_up_one_symbol (const char *name
, CORE_ADDR
*addrp
);
844 /* Called from linux-low.c when a clone event is detected. Upon entry,
845 both the clone and the parent should be stopped. This function does
846 whatever is required have the clone under thread_db's control. */
848 void thread_db_notice_clone (struct thread_info
*parent_thr
, ptid_t child_ptid
);
850 bool thread_db_thread_handle (ptid_t ptid
, gdb_byte
**handle
, int *handle_len
);
852 extern int have_ptrace_getregset
;
854 /* Search for the value with type MATCH in the auxv vector with
855 entries of length WORDSIZE bytes. If found, store the value in
856 *VALP and return 1. If not found or if there is an error, return
859 int linux_get_auxv (int wordsize
, CORE_ADDR match
,
862 /* Fetch the AT_HWCAP entry from the auxv vector, where entries are length
863 WORDSIZE. If no entry was found, return zero. */
865 CORE_ADDR
linux_get_hwcap (int wordsize
);
867 /* Fetch the AT_HWCAP2 entry from the auxv vector, where entries are length
868 WORDSIZE. If no entry was found, return zero. */
870 CORE_ADDR
linux_get_hwcap2 (int wordsize
);
872 #endif /* GDBSERVER_LINUX_LOW_H */