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 /* Hook to convert from target format to ptrace format and back.
135 Returns true if any conversion was done; false otherwise.
136 If DIRECTION is 1, then copy from INF to NATIVE.
137 If DIRECTION is 0, copy from NATIVE to INF. */
138 int (*siginfo_fixup
) (siginfo_t
*native
, gdb_byte
*inf
, int direction
);
140 /* Hook to call when a new process is created or attached to.
141 If extra per-process architecture-specific data is needed,
143 struct arch_process_info
* (*new_process
) (void);
145 /* Hook to call when a process is being deleted. If extra per-process
146 architecture-specific data is needed, delete it here. */
147 void (*delete_process
) (struct arch_process_info
*info
);
149 /* Hook to call when a new thread is detected.
150 If extra per-thread architecture-specific data is needed,
152 void (*new_thread
) (struct lwp_info
*);
154 /* Hook to call when a thread is being deleted. If extra per-thread
155 architecture-specific data is needed, delete it here. */
156 void (*delete_thread
) (struct arch_lwp_info
*);
158 /* Hook to call, if any, when a new fork is attached. */
159 void (*new_fork
) (struct process_info
*parent
, struct process_info
*child
);
161 /* Hook to call prior to resuming a thread. */
162 void (*prepare_to_resume
) (struct lwp_info
*);
164 /* Hook to support target specific qSupported. */
165 void (*process_qsupported
) (char **, int count
);
167 /* Returns true if the low target supports tracepoints. */
168 int (*supports_tracepoints
) (void);
170 /* Fill ADDRP with the thread area address of LWPID. Returns 0 on
171 success, -1 on failure. */
172 int (*get_thread_area
) (int lwpid
, CORE_ADDR
*addrp
);
174 /* Install a fast tracepoint jump pad. See target.h for
176 int (*install_fast_tracepoint_jump_pad
) (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
180 CORE_ADDR
*jump_entry
,
181 CORE_ADDR
*trampoline
,
182 ULONGEST
*trampoline_size
,
183 unsigned char *jjump_pad_insn
,
184 ULONGEST
*jjump_pad_insn_size
,
185 CORE_ADDR
*adjusted_insn_addr
,
186 CORE_ADDR
*adjusted_insn_addr_end
,
189 /* Return the bytecode operations vector for the current inferior.
190 Returns NULL if bytecode compilation is not supported. */
191 struct emit_ops
*(*emit_ops
) (void);
193 /* Return the minimum length of an instruction that can be safely overwritten
194 for use as a fast tracepoint. */
195 int (*get_min_fast_tracepoint_insn_len
) (void);
197 /* Returns true if the low target supports range stepping. */
198 int (*supports_range_stepping
) (void);
201 int (*supports_hardware_single_step
) (void);
203 /* Fill *SYSNO with the syscall nr trapped. Only to be called when
204 inferior is stopped due to SYSCALL_SIGTRAP. */
205 void (*get_syscall_trapinfo
) (struct regcache
*regcache
, int *sysno
);
208 int (*get_ipa_tdesc_idx
) (void);
211 extern struct linux_target_ops the_low_target
;
213 /* Target ops definitions for a Linux target. */
215 class linux_process_target
: public process_stratum_target
219 int create_inferior (const char *program
,
220 const std::vector
<char *> &program_args
) override
;
222 void post_create_inferior () override
;
224 int attach (unsigned long pid
) override
;
226 int kill (process_info
*proc
) override
;
228 int detach (process_info
*proc
) override
;
230 void mourn (process_info
*proc
) override
;
232 void join (int pid
) override
;
234 bool thread_alive (ptid_t pid
) override
;
236 void resume (thread_resume
*resume_info
, size_t n
) override
;
238 ptid_t
wait (ptid_t ptid
, target_waitstatus
*status
,
239 int options
) override
;
241 void fetch_registers (regcache
*regcache
, int regno
) override
;
243 void store_registers (regcache
*regcache
, int regno
) override
;
245 int prepare_to_access_memory () override
;
247 void done_accessing_memory () override
;
249 int read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
,
252 int write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
,
255 void look_up_symbols () override
;
257 void request_interrupt () override
;
259 bool supports_read_auxv () override
;
261 int read_auxv (CORE_ADDR offset
, unsigned char *myaddr
,
262 unsigned int len
) override
;
264 int insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
265 int size
, raw_breakpoint
*bp
) override
;
267 int remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
268 int size
, raw_breakpoint
*bp
) override
;
270 bool stopped_by_sw_breakpoint () override
;
272 bool supports_stopped_by_sw_breakpoint () override
;
274 bool stopped_by_hw_breakpoint () override
;
276 bool supports_stopped_by_hw_breakpoint () override
;
278 bool supports_hardware_single_step () override
;
280 bool stopped_by_watchpoint () override
;
282 CORE_ADDR
stopped_data_address () override
;
284 bool supports_read_offsets () override
;
286 int read_offsets (CORE_ADDR
*text
, CORE_ADDR
*data
) override
;
288 bool supports_get_tls_address () override
;
290 int get_tls_address (thread_info
*thread
, CORE_ADDR offset
,
291 CORE_ADDR load_module
, CORE_ADDR
*address
) override
;
293 bool supports_qxfer_osdata () override
;
295 int qxfer_osdata (const char *annex
, unsigned char *readbuf
,
296 unsigned const char *writebuf
,
297 CORE_ADDR offset
, int len
) override
;
299 bool supports_qxfer_siginfo () override
;
301 int qxfer_siginfo (const char *annex
, unsigned char *readbuf
,
302 unsigned const char *writebuf
,
303 CORE_ADDR offset
, int len
) override
;
305 bool supports_non_stop () override
;
307 bool async (bool enable
) override
;
309 int start_non_stop (bool enable
) override
;
311 bool supports_multi_process () override
;
313 bool supports_fork_events () override
;
315 bool supports_vfork_events () override
;
317 bool supports_exec_events () override
;
319 void handle_new_gdb_connection () override
;
321 int handle_monitor_command (char *mon
) override
;
323 int core_of_thread (ptid_t ptid
) override
;
325 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
326 bool supports_read_loadmap () override
;
328 int read_loadmap (const char *annex
, CORE_ADDR offset
,
329 unsigned char *myaddr
, unsigned int len
) override
;
332 void process_qsupported (char **features
, int count
) override
;
334 bool supports_tracepoints () override
;
336 CORE_ADDR
read_pc (regcache
*regcache
) override
;
338 void write_pc (regcache
*regcache
, CORE_ADDR pc
) override
;
340 bool supports_thread_stopped () override
;
342 bool thread_stopped (thread_info
*thread
) override
;
344 void pause_all (bool freeze
) override
;
346 void unpause_all (bool unfreeze
) override
;
348 void stabilize_threads () override
;
350 bool supports_fast_tracepoints () override
;
352 int install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
,
357 CORE_ADDR
*jump_entry
,
358 CORE_ADDR
*trampoline
,
359 ULONGEST
*trampoline_size
,
360 unsigned char *jjump_pad_insn
,
361 ULONGEST
*jjump_pad_insn_size
,
362 CORE_ADDR
*adjusted_insn_addr
,
363 CORE_ADDR
*adjusted_insn_addr_end
,
366 int get_min_fast_tracepoint_insn_len () override
;
368 struct emit_ops
*emit_ops () override
;
370 bool supports_disable_randomization () override
;
372 bool supports_qxfer_libraries_svr4 () override
;
374 int qxfer_libraries_svr4 (const char *annex
,
375 unsigned char *readbuf
,
376 unsigned const char *writebuf
,
377 CORE_ADDR offset
, int len
) override
;
379 bool supports_agent () override
;
381 #ifdef HAVE_LINUX_BTRACE
382 btrace_target_info
*enable_btrace (ptid_t ptid
,
383 const btrace_config
*conf
) override
;
385 int disable_btrace (btrace_target_info
*tinfo
) override
;
387 int read_btrace (btrace_target_info
*tinfo
, buffer
*buf
,
388 enum btrace_read_type type
) override
;
390 int read_btrace_conf (const btrace_target_info
*tinfo
,
391 buffer
*buf
) override
;
394 bool supports_range_stepping () override
;
396 bool supports_pid_to_exec_file () override
;
398 char *pid_to_exec_file (int pid
) override
;
400 bool supports_multifs () override
;
402 int multifs_open (int pid
, const char *filename
, int flags
,
403 mode_t mode
) override
;
405 int multifs_unlink (int pid
, const char *filename
) override
;
407 ssize_t
multifs_readlink (int pid
, const char *filename
, char *buf
,
408 size_t bufsiz
) override
;
410 const char *thread_name (ptid_t thread
) override
;
413 bool thread_handle (ptid_t ptid
, gdb_byte
**handle
,
414 int *handle_len
) override
;
417 bool supports_catch_syscall () override
;
419 int get_ipa_tdesc_idx () override
;
421 /* Return the information to access registers. This has public
422 visibility because proc-service uses it. */
423 virtual const regs_info
*get_regs_info () = 0;
427 /* Handle a GNU/Linux extended wait response. If we see a clone,
428 fork, or vfork event, we need to add the new LWP to our list
429 (and return 0 so as not to report the trap to higher layers).
430 If we see an exec event, we will modify ORIG_EVENT_LWP to point
431 to a new LWP representing the new program. */
432 int handle_extended_wait (lwp_info
**orig_event_lwp
, int wstat
);
434 /* Do low-level handling of the event, and check if we should go on
435 and pass it to caller code. Return the affected lwp if we are, or
437 lwp_info
*filter_event (int lwpid
, int wstat
);
439 /* Wait for an event from child(ren) WAIT_PTID, and return any that
440 match FILTER_PTID (leaving others pending). The PTIDs can be:
441 minus_one_ptid, to specify any child; a pid PTID, specifying all
442 lwps of a thread group; or a PTID representing a single lwp. Store
443 the stop status through the status pointer WSTAT. OPTIONS is
444 passed to the waitpid call. Return 0 if no event was found and
445 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
446 was found. Return the PID of the stopped child otherwise. */
447 int wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
448 int *wstatp
, int options
);
450 /* Wait for an event from child(ren) PTID. PTIDs can be:
451 minus_one_ptid, to specify any child; a pid PTID, specifying all
452 lwps of a thread group; or a PTID representing a single lwp. Store
453 the stop status through the status pointer WSTAT. OPTIONS is
454 passed to the waitpid call. Return 0 if no event was found and
455 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
456 was found. Return the PID of the stopped child otherwise. */
457 int wait_for_event (ptid_t ptid
, int *wstatp
, int options
);
459 /* Wait for all children to stop for the SIGSTOPs we just queued. */
460 void wait_for_sigstop ();
462 /* Wait for process, returns status. */
463 ptid_t
wait_1 (ptid_t ptid
, target_waitstatus
*ourstatus
,
466 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
467 If SUSPEND, then also increase the suspend count of every LWP,
469 void stop_all_lwps (int suspend
, lwp_info
*except
);
471 /* Stopped LWPs that the client wanted to be running, that don't have
472 pending statuses, are set to run again, except for EXCEPT, if not
473 NULL. This undoes a stop_all_lwps call. */
474 void unstop_all_lwps (int unsuspend
, lwp_info
*except
);
476 /* Start a step-over operation on LWP. When LWP stopped at a
477 breakpoint, to make progress, we need to remove the breakpoint out
478 of the way. If we let other threads run while we do that, they may
479 pass by the breakpoint location and miss hitting it. To avoid
480 that, a step-over momentarily stops all threads while LWP is
481 single-stepped by either hardware or software while the breakpoint
482 is temporarily uninserted from the inferior. When the single-step
483 finishes, we reinsert the breakpoint, and let all threads that are
484 supposed to be running, run again. */
485 void start_step_over (lwp_info
*lwp
);
487 /* If there's a step over in progress, wait until all threads stop
488 (that is, until the stepping thread finishes its step), and
489 unsuspend all lwps. The stepping thread ends with its status
490 pending, which is processed later when we get back to processing
492 void complete_ongoing_step_over ();
494 /* When we finish a step-over, set threads running again. If there's
495 another thread that may need a step-over, now's the time to start
496 it. Eventually, we'll move all threads past their breakpoints. */
497 void proceed_all_lwps ();
499 /* The reason we resume in the caller, is because we want to be able
500 to pass lwp->status_pending as WSTAT, and we need to clear
501 status_pending_p before resuming, otherwise, resume_one_lwp
502 refuses to resume. */
503 bool maybe_move_out_of_jump_pad (lwp_info
*lwp
, int *wstat
);
505 /* Move THREAD out of the jump pad. */
506 void move_out_of_jump_pad (thread_info
*thread
);
508 /* Call low_arch_setup on THREAD. */
509 void arch_setup_thread (thread_info
*thread
);
511 #ifdef HAVE_LINUX_USRREGS
512 /* Fetch one register. */
513 void fetch_register (const usrregs_info
*usrregs
, regcache
*regcache
,
516 /* Store one register. */
517 void store_register (const usrregs_info
*usrregs
, regcache
*regcache
,
521 /* Fetch all registers, or just one, from the child process.
522 If REGNO is -1, do this for all registers, skipping any that are
523 assumed to have been retrieved by regsets_fetch_inferior_registers,
524 unless ALL is non-zero.
525 Otherwise, REGNO specifies which register (so we can save time). */
526 void usr_fetch_inferior_registers (const regs_info
*regs_info
,
527 regcache
*regcache
, int regno
, int all
);
529 /* Store our register values back into the inferior.
530 If REGNO is -1, do this for all registers, skipping any that are
531 assumed to have been saved by regsets_store_inferior_registers,
532 unless ALL is non-zero.
533 Otherwise, REGNO specifies which register (so we can save time). */
534 void usr_store_inferior_registers (const regs_info
*regs_info
,
535 regcache
*regcache
, int regno
, int all
);
537 /* Return the PC as read from the regcache of LWP, without any
539 CORE_ADDR
get_pc (lwp_info
*lwp
);
541 /* Called when the LWP stopped for a signal/trap. If it stopped for a
542 trap check what caused it (breakpoint, watchpoint, trace, etc.),
543 and save the result in the LWP's stop_reason field. If it stopped
544 for a breakpoint, decrement the PC if necessary on the lwp's
545 architecture. Returns true if we now have the LWP's stop PC. */
546 bool save_stop_reason (lwp_info
*lwp
);
548 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
549 SIGNAL is nonzero, give it that signal. */
550 void resume_one_lwp_throw (lwp_info
*lwp
, int step
, int signal
,
553 /* Like resume_one_lwp_throw, but no error is thrown if the LWP
554 disappears while we try to resume it. */
555 void resume_one_lwp (lwp_info
*lwp
, int step
, int signal
, siginfo_t
*info
);
557 /* This function is called once per thread. We check the thread's
558 last resume request, which will tell us whether to resume, step, or
559 leave the thread stopped. Any signal the client requested to be
560 delivered has already been enqueued at this point.
562 If any thread that GDB wants running is stopped at an internal
563 breakpoint that needs stepping over, we start a step-over operation
564 on that particular thread, and leave all others stopped. */
565 void proceed_one_lwp (thread_info
*thread
, lwp_info
*except
);
567 /* This function is called once per thread. We check the thread's
568 resume request, which will tell us whether to resume, step, or
569 leave the thread stopped; and what signal, if any, it should be
572 For threads which we aren't explicitly told otherwise, we preserve
573 the stepping flag; this is used for stepping over gdbserver-placed
576 If pending_flags was set in any thread, we queue any needed
577 signals, since we won't actually resume. We already have a pending
578 event to report, so we don't need to preserve any step requests;
579 they should be re-issued if necessary. */
580 void resume_one_thread (thread_info
*thread
, bool leave_all_stopped
);
582 /* Return true if this lwp has an interesting status pending. */
583 bool status_pending_p_callback (thread_info
*thread
, ptid_t ptid
);
585 /* Resume LWPs that are currently stopped without any pending status
586 to report, but are resumed from the core's perspective. */
587 void resume_stopped_resumed_lwps (thread_info
*thread
);
589 /* Unsuspend THREAD, except EXCEPT, and proceed. */
590 void unsuspend_and_proceed_one_lwp (thread_info
*thread
, lwp_info
*except
);
592 /* Return true if this lwp still has an interesting status pending.
593 If not (e.g., it had stopped for a breakpoint that is gone), return
595 bool thread_still_has_status_pending (thread_info
*thread
);
597 /* Return true if this lwp is to-be-resumed and has an interesting
599 bool resume_status_pending (thread_info
*thread
);
601 /* Return true if this lwp that GDB wants running is stopped at an
602 internal breakpoint that we need to step over. It assumes that
603 any required STOP_PC adjustment has already been propagated to
604 the inferior's regcache. */
605 bool thread_needs_step_over (thread_info
*thread
);
607 /* Single step via hardware or software single step.
608 Return 1 if hardware single stepping, 0 if software single stepping
609 or can't single step. */
610 int single_step (lwp_info
* lwp
);
612 /* Install breakpoints for software single stepping. */
613 void install_software_single_step_breakpoints (lwp_info
*lwp
);
615 /* Fetch the possibly triggered data watchpoint info and store it in
618 On some archs, like x86, that use debug registers to set
619 watchpoints, it's possible that the way to know which watched
620 address trapped, is to check the register that is used to select
621 which address to watch. Problem is, between setting the watchpoint
622 and reading back which data address trapped, the user may change
623 the set of watchpoints, and, as a consequence, GDB changes the
624 debug registers in the inferior. To avoid reading back a stale
625 stopped-data-address when that happens, we cache in LP the fact
626 that a watchpoint trapped, and the corresponding data address, as
627 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
628 registers meanwhile, we have the cached data we can rely on. */
629 bool check_stopped_by_watchpoint (lwp_info
*child
);
632 /* The architecture-specific "low" methods are listed below. */
634 /* Architecture-specific setup for the current thread. */
635 virtual void low_arch_setup () = 0;
637 /* Return false if we can fetch/store the register, true if we cannot
638 fetch/store the register. */
639 virtual bool low_cannot_fetch_register (int regno
) = 0;
641 virtual bool low_cannot_store_register (int regno
) = 0;
643 /* Hook to fetch a register in some non-standard way. Used for
644 example by backends that have read-only registers with hardcoded
645 values (e.g., IA64's gr0/fr0/fr1). Returns true if register
646 REGNO was supplied, false if not, and we should fallback to the
647 standard ptrace methods. */
648 virtual bool low_fetch_register (regcache
*regcache
, int regno
);
650 /* Return true if breakpoints are supported. Such targets must
651 implement the GET_PC and SET_PC methods. */
652 virtual bool low_supports_breakpoints ();
654 virtual CORE_ADDR
low_get_pc (regcache
*regcache
);
656 virtual void low_set_pc (regcache
*regcache
, CORE_ADDR newpc
);
658 /* Find the next possible PCs after the current instruction executes.
659 Targets that override this method should also override
660 'supports_software_single_step' to return true. */
661 virtual std::vector
<CORE_ADDR
> low_get_next_pcs (regcache
*regcache
);
663 /* Return true if there is a breakpoint at PC. */
664 virtual bool low_breakpoint_at (CORE_ADDR pc
) = 0;
666 /* Breakpoint and watchpoint related functions. See target.h for
668 virtual int low_insert_point (raw_bkpt_type type
, CORE_ADDR addr
,
669 int size
, raw_breakpoint
*bp
);
671 virtual int low_remove_point (raw_bkpt_type type
, CORE_ADDR addr
,
672 int size
, raw_breakpoint
*bp
);
674 virtual bool low_stopped_by_watchpoint ();
676 virtual CORE_ADDR
low_stopped_data_address ();
678 /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
679 for registers smaller than an xfer unit). */
680 virtual void low_collect_ptrace_register (regcache
*regcache
, int regno
,
683 virtual void low_supply_ptrace_register (regcache
*regcache
, int regno
,
686 /* How many bytes the PC should be decremented after a break. */
687 virtual int low_decr_pc_after_break ();
690 extern linux_process_target
*the_linux_target
;
692 #define get_thread_lwp(thr) ((struct lwp_info *) (thread_target_data (thr)))
693 #define get_lwp_thread(lwp) ((lwp)->thread)
695 /* This struct is recorded in the target_data field of struct thread_info.
697 On linux ``all_threads'' is keyed by the LWP ID, which we use as the
698 GDB protocol representation of the thread ID. Threads also have
699 a "process ID" (poorly named) which is (presently) the same as the
702 There is also ``all_processes'' is keyed by the "overall process ID",
703 which GNU/Linux calls tgid, "thread group ID". */
707 /* Backlink to the parent object. */
708 struct thread_info
*thread
;
710 /* If this flag is set, the next SIGSTOP will be ignored (the
711 process will be immediately resumed). This means that either we
712 sent the SIGSTOP to it ourselves and got some other pending event
713 (so the SIGSTOP is still pending), or that we stopped the
714 inferior implicitly via PTRACE_ATTACH and have not waited for it
718 /* When this is true, we shall not try to resume this thread, even
719 if last_resume_kind isn't resume_stop. */
722 /* If this flag is set, the lwp is known to be stopped right now (stop
723 event already received in a wait()). */
726 /* Signal whether we are in a SYSCALL_ENTRY or
727 in a SYSCALL_RETURN event.
729 - TARGET_WAITKIND_SYSCALL_ENTRY
730 - TARGET_WAITKIND_SYSCALL_RETURN */
731 enum target_waitkind syscall_state
;
733 /* When stopped is set, the last wait status recorded for this lwp. */
736 /* If WAITSTATUS->KIND != TARGET_WAITKIND_IGNORE, the waitstatus for
737 this LWP's last event, to pass to GDB without any further
738 processing. This is used to store extended ptrace event
739 information or exit status until it can be reported to GDB. */
740 struct target_waitstatus waitstatus
;
742 /* A pointer to the fork child/parent relative. Valid only while
743 the parent fork event is not reported to higher layers. Used to
744 avoid wildcard vCont actions resuming a fork child before GDB is
745 notified about the parent's fork event. */
746 struct lwp_info
*fork_relative
;
748 /* When stopped is set, this is where the lwp last stopped, with
749 decr_pc_after_break already accounted for. If the LWP is
750 running, this is the address at which the lwp was resumed. */
753 /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
755 int status_pending_p
;
758 /* The reason the LWP last stopped, if we need to track it
759 (breakpoint, watchpoint, etc.) */
760 enum target_stop_reason stop_reason
;
762 /* On architectures where it is possible to know the data address of
763 a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
764 contains such data address. Only valid if STOPPED_BY_WATCHPOINT
766 CORE_ADDR stopped_data_address
;
768 /* If this is non-zero, it is a breakpoint to be reinserted at our next
769 stop (SIGTRAP stops only). */
770 CORE_ADDR bp_reinsert
;
772 /* If this flag is set, the last continue operation at the ptrace
773 level on this process was a single-step. */
776 /* Range to single step within. This is a copy of the step range
777 passed along the last resume request. See 'struct
779 CORE_ADDR step_range_start
; /* Inclusive */
780 CORE_ADDR step_range_end
; /* Exclusive */
782 /* If this flag is set, we need to set the event request flags the
783 next time we see this LWP stop. */
784 int must_set_ptrace_flags
;
786 /* If this is non-zero, it points to a chain of signals which need to
787 be delivered to this process. */
788 struct pending_signals
*pending_signals
;
790 /* A link used when resuming. It is initialized from the resume request,
791 and then processed and cleared in linux_resume_one_lwp. */
792 struct thread_resume
*resume
;
794 /* Information bout this lwp's fast tracepoint collection status (is it
795 currently stopped in the jump pad, and if so, before or at/after the
796 relocated instruction). Normally, we won't care about this, but we will
797 if a signal arrives to this lwp while it is collecting. */
798 fast_tpoint_collect_result collecting_fast_tracepoint
;
800 /* If this is non-zero, it points to a chain of signals which need
801 to be reported to GDB. These were deferred because the thread
802 was doing a fast tracepoint collect when they arrived. */
803 struct pending_signals
*pending_signals_to_report
;
805 /* When collecting_fast_tracepoint is first found to be 1, we insert
806 a exit-jump-pad-quickly breakpoint. This is it. */
807 struct breakpoint
*exit_jump_pad_bkpt
;
811 /* The thread handle, used for e.g. TLS access. Only valid if
812 THREAD_KNOWN is set. */
815 /* The pthread_t handle. */
816 thread_t thread_handle
;
819 /* Arch-specific additions. */
820 struct arch_lwp_info
*arch_private
;
823 int linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
);
825 /* Attach to PTID. Returns 0 on success, non-zero otherwise (an
827 int linux_attach_lwp (ptid_t ptid
);
829 struct lwp_info
*find_lwp_pid (ptid_t ptid
);
830 /* For linux_stop_lwp see nat/linux-nat.h. */
832 #ifdef HAVE_LINUX_REGSETS
833 void initialize_regsets_info (struct regsets_info
*regsets_info
);
836 void initialize_low_arch (void);
838 void linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
);
839 CORE_ADDR
linux_get_pc_32bit (struct regcache
*regcache
);
841 void linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
);
842 CORE_ADDR
linux_get_pc_64bit (struct regcache
*regcache
);
844 /* From thread-db.c */
845 int thread_db_init (void);
846 void thread_db_detach (struct process_info
*);
847 void thread_db_mourn (struct process_info
*);
848 int thread_db_handle_monitor_command (char *);
849 int thread_db_get_tls_address (struct thread_info
*thread
, CORE_ADDR offset
,
850 CORE_ADDR load_module
, CORE_ADDR
*address
);
851 int thread_db_look_up_one_symbol (const char *name
, CORE_ADDR
*addrp
);
853 /* Called from linux-low.c when a clone event is detected. Upon entry,
854 both the clone and the parent should be stopped. This function does
855 whatever is required have the clone under thread_db's control. */
857 void thread_db_notice_clone (struct thread_info
*parent_thr
, ptid_t child_ptid
);
859 bool thread_db_thread_handle (ptid_t ptid
, gdb_byte
**handle
, int *handle_len
);
861 extern int have_ptrace_getregset
;
863 /* Search for the value with type MATCH in the auxv vector with
864 entries of length WORDSIZE bytes. If found, store the value in
865 *VALP and return 1. If not found or if there is an error, return
868 int linux_get_auxv (int wordsize
, CORE_ADDR match
,
871 /* Fetch the AT_HWCAP entry from the auxv vector, where entries are length
872 WORDSIZE. If no entry was found, return zero. */
874 CORE_ADDR
linux_get_hwcap (int wordsize
);
876 /* Fetch the AT_HWCAP2 entry from the auxv vector, where entries are length
877 WORDSIZE. If no entry was found, return zero. */
879 CORE_ADDR
linux_get_hwcap2 (int wordsize
);
881 #endif /* GDBSERVER_LINUX_LOW_H */