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 /* Fill ADDRP with the thread area address of LWPID. Returns 0 on
135 success, -1 on failure. */
136 int (*get_thread_area
) (int lwpid
, CORE_ADDR
*addrp
);
138 /* Install a fast tracepoint jump pad. See target.h for
140 int (*install_fast_tracepoint_jump_pad
) (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
144 CORE_ADDR
*jump_entry
,
145 CORE_ADDR
*trampoline
,
146 ULONGEST
*trampoline_size
,
147 unsigned char *jjump_pad_insn
,
148 ULONGEST
*jjump_pad_insn_size
,
149 CORE_ADDR
*adjusted_insn_addr
,
150 CORE_ADDR
*adjusted_insn_addr_end
,
153 /* Return the bytecode operations vector for the current inferior.
154 Returns NULL if bytecode compilation is not supported. */
155 struct emit_ops
*(*emit_ops
) (void);
157 /* Return the minimum length of an instruction that can be safely overwritten
158 for use as a fast tracepoint. */
159 int (*get_min_fast_tracepoint_insn_len
) (void);
161 /* Returns true if the low target supports range stepping. */
162 int (*supports_range_stepping
) (void);
165 int (*supports_hardware_single_step
) (void);
167 /* Fill *SYSNO with the syscall nr trapped. Only to be called when
168 inferior is stopped due to SYSCALL_SIGTRAP. */
169 void (*get_syscall_trapinfo
) (struct regcache
*regcache
, int *sysno
);
172 int (*get_ipa_tdesc_idx
) (void);
175 extern struct linux_target_ops the_low_target
;
177 /* Target ops definitions for a Linux target. */
179 class linux_process_target
: public process_stratum_target
183 int create_inferior (const char *program
,
184 const std::vector
<char *> &program_args
) override
;
186 void post_create_inferior () override
;
188 int attach (unsigned long pid
) override
;
190 int kill (process_info
*proc
) override
;
192 int detach (process_info
*proc
) override
;
194 void mourn (process_info
*proc
) override
;
196 void join (int pid
) override
;
198 bool thread_alive (ptid_t pid
) override
;
200 void resume (thread_resume
*resume_info
, size_t n
) override
;
202 ptid_t
wait (ptid_t ptid
, target_waitstatus
*status
,
203 int options
) override
;
205 void fetch_registers (regcache
*regcache
, int regno
) override
;
207 void store_registers (regcache
*regcache
, int regno
) override
;
209 int prepare_to_access_memory () override
;
211 void done_accessing_memory () override
;
213 int read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
,
216 int write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
,
219 void look_up_symbols () override
;
221 void request_interrupt () override
;
223 bool supports_read_auxv () override
;
225 int read_auxv (CORE_ADDR offset
, unsigned char *myaddr
,
226 unsigned int len
) override
;
228 int insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
229 int size
, raw_breakpoint
*bp
) override
;
231 int remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
232 int size
, raw_breakpoint
*bp
) override
;
234 bool stopped_by_sw_breakpoint () override
;
236 bool supports_stopped_by_sw_breakpoint () override
;
238 bool stopped_by_hw_breakpoint () override
;
240 bool supports_stopped_by_hw_breakpoint () override
;
242 bool supports_hardware_single_step () override
;
244 bool stopped_by_watchpoint () override
;
246 CORE_ADDR
stopped_data_address () override
;
248 bool supports_read_offsets () override
;
250 int read_offsets (CORE_ADDR
*text
, CORE_ADDR
*data
) override
;
252 bool supports_get_tls_address () override
;
254 int get_tls_address (thread_info
*thread
, CORE_ADDR offset
,
255 CORE_ADDR load_module
, CORE_ADDR
*address
) override
;
257 bool supports_qxfer_osdata () override
;
259 int qxfer_osdata (const char *annex
, unsigned char *readbuf
,
260 unsigned const char *writebuf
,
261 CORE_ADDR offset
, int len
) override
;
263 bool supports_qxfer_siginfo () override
;
265 int qxfer_siginfo (const char *annex
, unsigned char *readbuf
,
266 unsigned const char *writebuf
,
267 CORE_ADDR offset
, int len
) override
;
269 bool supports_non_stop () override
;
271 bool async (bool enable
) override
;
273 int start_non_stop (bool enable
) override
;
275 bool supports_multi_process () override
;
277 bool supports_fork_events () override
;
279 bool supports_vfork_events () override
;
281 bool supports_exec_events () override
;
283 void handle_new_gdb_connection () override
;
285 int handle_monitor_command (char *mon
) override
;
287 int core_of_thread (ptid_t ptid
) override
;
289 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
290 bool supports_read_loadmap () override
;
292 int read_loadmap (const char *annex
, CORE_ADDR offset
,
293 unsigned char *myaddr
, unsigned int len
) override
;
296 CORE_ADDR
read_pc (regcache
*regcache
) override
;
298 void write_pc (regcache
*regcache
, CORE_ADDR pc
) override
;
300 bool supports_thread_stopped () override
;
302 bool thread_stopped (thread_info
*thread
) override
;
304 void pause_all (bool freeze
) override
;
306 void unpause_all (bool unfreeze
) override
;
308 void stabilize_threads () override
;
310 bool supports_fast_tracepoints () override
;
312 int install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
,
317 CORE_ADDR
*jump_entry
,
318 CORE_ADDR
*trampoline
,
319 ULONGEST
*trampoline_size
,
320 unsigned char *jjump_pad_insn
,
321 ULONGEST
*jjump_pad_insn_size
,
322 CORE_ADDR
*adjusted_insn_addr
,
323 CORE_ADDR
*adjusted_insn_addr_end
,
326 int get_min_fast_tracepoint_insn_len () override
;
328 struct emit_ops
*emit_ops () override
;
330 bool supports_disable_randomization () override
;
332 bool supports_qxfer_libraries_svr4 () override
;
334 int qxfer_libraries_svr4 (const char *annex
,
335 unsigned char *readbuf
,
336 unsigned const char *writebuf
,
337 CORE_ADDR offset
, int len
) override
;
339 bool supports_agent () override
;
341 #ifdef HAVE_LINUX_BTRACE
342 btrace_target_info
*enable_btrace (ptid_t ptid
,
343 const btrace_config
*conf
) override
;
345 int disable_btrace (btrace_target_info
*tinfo
) override
;
347 int read_btrace (btrace_target_info
*tinfo
, buffer
*buf
,
348 enum btrace_read_type type
) override
;
350 int read_btrace_conf (const btrace_target_info
*tinfo
,
351 buffer
*buf
) override
;
354 bool supports_range_stepping () override
;
356 bool supports_pid_to_exec_file () override
;
358 char *pid_to_exec_file (int pid
) override
;
360 bool supports_multifs () override
;
362 int multifs_open (int pid
, const char *filename
, int flags
,
363 mode_t mode
) override
;
365 int multifs_unlink (int pid
, const char *filename
) override
;
367 ssize_t
multifs_readlink (int pid
, const char *filename
, char *buf
,
368 size_t bufsiz
) override
;
370 const char *thread_name (ptid_t thread
) override
;
373 bool thread_handle (ptid_t ptid
, gdb_byte
**handle
,
374 int *handle_len
) override
;
377 bool supports_catch_syscall () override
;
379 int get_ipa_tdesc_idx () override
;
381 /* Return the information to access registers. This has public
382 visibility because proc-service uses it. */
383 virtual const regs_info
*get_regs_info () = 0;
387 /* Handle a GNU/Linux extended wait response. If we see a clone,
388 fork, or vfork event, we need to add the new LWP to our list
389 (and return 0 so as not to report the trap to higher layers).
390 If we see an exec event, we will modify ORIG_EVENT_LWP to point
391 to a new LWP representing the new program. */
392 int handle_extended_wait (lwp_info
**orig_event_lwp
, int wstat
);
394 /* Do low-level handling of the event, and check if we should go on
395 and pass it to caller code. Return the affected lwp if we are, or
397 lwp_info
*filter_event (int lwpid
, int wstat
);
399 /* Wait for an event from child(ren) WAIT_PTID, and return any that
400 match FILTER_PTID (leaving others pending). The PTIDs can be:
401 minus_one_ptid, to specify any child; a pid PTID, specifying all
402 lwps of a thread group; or a PTID representing a single lwp. Store
403 the stop status through the status pointer WSTAT. OPTIONS is
404 passed to the waitpid call. Return 0 if no event was found and
405 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
406 was found. Return the PID of the stopped child otherwise. */
407 int wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
408 int *wstatp
, int options
);
410 /* Wait for an event from child(ren) PTID. PTIDs can be:
411 minus_one_ptid, to specify any child; a pid PTID, specifying all
412 lwps of a thread group; or a PTID representing a single lwp. Store
413 the stop status through the status pointer WSTAT. OPTIONS is
414 passed to the waitpid call. Return 0 if no event was found and
415 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
416 was found. Return the PID of the stopped child otherwise. */
417 int wait_for_event (ptid_t ptid
, int *wstatp
, int options
);
419 /* Wait for all children to stop for the SIGSTOPs we just queued. */
420 void wait_for_sigstop ();
422 /* Wait for process, returns status. */
423 ptid_t
wait_1 (ptid_t ptid
, target_waitstatus
*ourstatus
,
426 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
427 If SUSPEND, then also increase the suspend count of every LWP,
429 void stop_all_lwps (int suspend
, lwp_info
*except
);
431 /* Stopped LWPs that the client wanted to be running, that don't have
432 pending statuses, are set to run again, except for EXCEPT, if not
433 NULL. This undoes a stop_all_lwps call. */
434 void unstop_all_lwps (int unsuspend
, lwp_info
*except
);
436 /* Start a step-over operation on LWP. When LWP stopped at a
437 breakpoint, to make progress, we need to remove the breakpoint out
438 of the way. If we let other threads run while we do that, they may
439 pass by the breakpoint location and miss hitting it. To avoid
440 that, a step-over momentarily stops all threads while LWP is
441 single-stepped by either hardware or software while the breakpoint
442 is temporarily uninserted from the inferior. When the single-step
443 finishes, we reinsert the breakpoint, and let all threads that are
444 supposed to be running, run again. */
445 void start_step_over (lwp_info
*lwp
);
447 /* If there's a step over in progress, wait until all threads stop
448 (that is, until the stepping thread finishes its step), and
449 unsuspend all lwps. The stepping thread ends with its status
450 pending, which is processed later when we get back to processing
452 void complete_ongoing_step_over ();
454 /* When we finish a step-over, set threads running again. If there's
455 another thread that may need a step-over, now's the time to start
456 it. Eventually, we'll move all threads past their breakpoints. */
457 void proceed_all_lwps ();
459 /* The reason we resume in the caller, is because we want to be able
460 to pass lwp->status_pending as WSTAT, and we need to clear
461 status_pending_p before resuming, otherwise, resume_one_lwp
462 refuses to resume. */
463 bool maybe_move_out_of_jump_pad (lwp_info
*lwp
, int *wstat
);
465 /* Move THREAD out of the jump pad. */
466 void move_out_of_jump_pad (thread_info
*thread
);
468 /* Call low_arch_setup on THREAD. */
469 void arch_setup_thread (thread_info
*thread
);
471 #ifdef HAVE_LINUX_USRREGS
472 /* Fetch one register. */
473 void fetch_register (const usrregs_info
*usrregs
, regcache
*regcache
,
476 /* Store one register. */
477 void store_register (const usrregs_info
*usrregs
, regcache
*regcache
,
481 /* Fetch all registers, or just one, from the child process.
482 If REGNO is -1, do this for all registers, skipping any that are
483 assumed to have been retrieved by regsets_fetch_inferior_registers,
484 unless ALL is non-zero.
485 Otherwise, REGNO specifies which register (so we can save time). */
486 void usr_fetch_inferior_registers (const regs_info
*regs_info
,
487 regcache
*regcache
, int regno
, int all
);
489 /* Store our register values back into the inferior.
490 If REGNO is -1, do this for all registers, skipping any that are
491 assumed to have been saved by regsets_store_inferior_registers,
492 unless ALL is non-zero.
493 Otherwise, REGNO specifies which register (so we can save time). */
494 void usr_store_inferior_registers (const regs_info
*regs_info
,
495 regcache
*regcache
, int regno
, int all
);
497 /* Return the PC as read from the regcache of LWP, without any
499 CORE_ADDR
get_pc (lwp_info
*lwp
);
501 /* Called when the LWP stopped for a signal/trap. If it stopped for a
502 trap check what caused it (breakpoint, watchpoint, trace, etc.),
503 and save the result in the LWP's stop_reason field. If it stopped
504 for a breakpoint, decrement the PC if necessary on the lwp's
505 architecture. Returns true if we now have the LWP's stop PC. */
506 bool save_stop_reason (lwp_info
*lwp
);
508 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
509 SIGNAL is nonzero, give it that signal. */
510 void resume_one_lwp_throw (lwp_info
*lwp
, int step
, int signal
,
513 /* Like resume_one_lwp_throw, but no error is thrown if the LWP
514 disappears while we try to resume it. */
515 void resume_one_lwp (lwp_info
*lwp
, int step
, int signal
, siginfo_t
*info
);
517 /* This function is called once per thread. We check the thread's
518 last resume request, which will tell us whether to resume, step, or
519 leave the thread stopped. Any signal the client requested to be
520 delivered has already been enqueued at this point.
522 If any thread that GDB wants running is stopped at an internal
523 breakpoint that needs stepping over, we start a step-over operation
524 on that particular thread, and leave all others stopped. */
525 void proceed_one_lwp (thread_info
*thread
, lwp_info
*except
);
527 /* This function is called once per thread. We check the thread's
528 resume request, which will tell us whether to resume, step, or
529 leave the thread stopped; and what signal, if any, it should be
532 For threads which we aren't explicitly told otherwise, we preserve
533 the stepping flag; this is used for stepping over gdbserver-placed
536 If pending_flags was set in any thread, we queue any needed
537 signals, since we won't actually resume. We already have a pending
538 event to report, so we don't need to preserve any step requests;
539 they should be re-issued if necessary. */
540 void resume_one_thread (thread_info
*thread
, bool leave_all_stopped
);
542 /* Return true if this lwp has an interesting status pending. */
543 bool status_pending_p_callback (thread_info
*thread
, ptid_t ptid
);
545 /* Resume LWPs that are currently stopped without any pending status
546 to report, but are resumed from the core's perspective. */
547 void resume_stopped_resumed_lwps (thread_info
*thread
);
549 /* Unsuspend THREAD, except EXCEPT, and proceed. */
550 void unsuspend_and_proceed_one_lwp (thread_info
*thread
, lwp_info
*except
);
552 /* Return true if this lwp still has an interesting status pending.
553 If not (e.g., it had stopped for a breakpoint that is gone), return
555 bool thread_still_has_status_pending (thread_info
*thread
);
557 /* Return true if this lwp is to-be-resumed and has an interesting
559 bool resume_status_pending (thread_info
*thread
);
561 /* Return true if this lwp that GDB wants running is stopped at an
562 internal breakpoint that we need to step over. It assumes that
563 any required STOP_PC adjustment has already been propagated to
564 the inferior's regcache. */
565 bool thread_needs_step_over (thread_info
*thread
);
567 /* Single step via hardware or software single step.
568 Return 1 if hardware single stepping, 0 if software single stepping
569 or can't single step. */
570 int single_step (lwp_info
* lwp
);
572 /* Install breakpoints for software single stepping. */
573 void install_software_single_step_breakpoints (lwp_info
*lwp
);
575 /* Fetch the possibly triggered data watchpoint info and store it in
578 On some archs, like x86, that use debug registers to set
579 watchpoints, it's possible that the way to know which watched
580 address trapped, is to check the register that is used to select
581 which address to watch. Problem is, between setting the watchpoint
582 and reading back which data address trapped, the user may change
583 the set of watchpoints, and, as a consequence, GDB changes the
584 debug registers in the inferior. To avoid reading back a stale
585 stopped-data-address when that happens, we cache in LP the fact
586 that a watchpoint trapped, and the corresponding data address, as
587 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
588 registers meanwhile, we have the cached data we can rely on. */
589 bool check_stopped_by_watchpoint (lwp_info
*child
);
591 /* Convert a native/host siginfo object, into/from the siginfo in the
592 layout of the inferiors' architecture. */
593 void siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
,
596 /* Add a process to the common process list, and set its private
598 process_info
*add_linux_process (int pid
, int attached
);
600 /* Add a new thread. */
601 lwp_info
*add_lwp (ptid_t ptid
);
603 /* Delete a thread. */
604 void delete_lwp (lwp_info
*lwp
);
606 public: /* Make this public because it's used from outside. */
607 /* Attach to an inferior process. Returns 0 on success, ERRNO on
609 int attach_lwp (ptid_t ptid
);
611 private: /* Back to private. */
612 /* Detach from LWP. */
613 void detach_one_lwp (lwp_info
*lwp
);
615 /* Detect zombie thread group leaders, and "exit" them. We can't
616 reap their exits until all other threads in the group have
618 void check_zombie_leaders ();
620 /* Convenience function that is called when the kernel reports an exit
621 event. This decides whether to report the event to GDB as a
622 process exit event, a thread exit event, or to suppress the
624 ptid_t
filter_exit_event (lwp_info
*event_child
,
625 target_waitstatus
*ourstatus
);
628 /* The architecture-specific "low" methods are listed below. */
630 /* Architecture-specific setup for the current thread. */
631 virtual void low_arch_setup () = 0;
633 /* Return false if we can fetch/store the register, true if we cannot
634 fetch/store the register. */
635 virtual bool low_cannot_fetch_register (int regno
) = 0;
637 virtual bool low_cannot_store_register (int regno
) = 0;
639 /* Hook to fetch a register in some non-standard way. Used for
640 example by backends that have read-only registers with hardcoded
641 values (e.g., IA64's gr0/fr0/fr1). Returns true if register
642 REGNO was supplied, false if not, and we should fallback to the
643 standard ptrace methods. */
644 virtual bool low_fetch_register (regcache
*regcache
, int regno
);
646 /* Return true if breakpoints are supported. Such targets must
647 implement the GET_PC and SET_PC methods. */
648 virtual bool low_supports_breakpoints ();
650 virtual CORE_ADDR
low_get_pc (regcache
*regcache
);
652 virtual void low_set_pc (regcache
*regcache
, CORE_ADDR newpc
);
654 /* Find the next possible PCs after the current instruction executes.
655 Targets that override this method should also override
656 'supports_software_single_step' to return true. */
657 virtual std::vector
<CORE_ADDR
> low_get_next_pcs (regcache
*regcache
);
659 /* Return true if there is a breakpoint at PC. */
660 virtual bool low_breakpoint_at (CORE_ADDR pc
) = 0;
662 /* Breakpoint and watchpoint related functions. See target.h for
664 virtual int low_insert_point (raw_bkpt_type type
, CORE_ADDR addr
,
665 int size
, raw_breakpoint
*bp
);
667 virtual int low_remove_point (raw_bkpt_type type
, CORE_ADDR addr
,
668 int size
, raw_breakpoint
*bp
);
670 virtual bool low_stopped_by_watchpoint ();
672 virtual CORE_ADDR
low_stopped_data_address ();
674 /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
675 for registers smaller than an xfer unit). */
676 virtual void low_collect_ptrace_register (regcache
*regcache
, int regno
,
679 virtual void low_supply_ptrace_register (regcache
*regcache
, int regno
,
682 /* Hook to convert from target format to ptrace format and back.
683 Returns true if any conversion was done; false otherwise.
684 If DIRECTION is 1, then copy from INF to NATIVE.
685 If DIRECTION is 0, copy from NATIVE to INF. */
686 virtual bool low_siginfo_fixup (siginfo_t
*native
, gdb_byte
*inf
,
689 /* Hook to call when a new process is created or attached to.
690 If extra per-process architecture-specific data is needed,
692 virtual arch_process_info
*low_new_process ();
694 /* Hook to call when a process is being deleted. If extra per-process
695 architecture-specific data is needed, delete it here. */
696 virtual void low_delete_process (arch_process_info
*info
);
698 /* Hook to call when a new thread is detected.
699 If extra per-thread architecture-specific data is needed,
701 virtual void low_new_thread (lwp_info
*);
703 /* Hook to call when a thread is being deleted. If extra per-thread
704 architecture-specific data is needed, delete it here. */
705 virtual void low_delete_thread (arch_lwp_info
*);
707 /* Hook to call, if any, when a new fork is attached. */
708 virtual void low_new_fork (process_info
*parent
, process_info
*child
);
710 /* Hook to call prior to resuming a thread. */
711 virtual void low_prepare_to_resume (lwp_info
*lwp
);
713 /* How many bytes the PC should be decremented after a break. */
714 virtual int low_decr_pc_after_break ();
717 extern linux_process_target
*the_linux_target
;
719 #define get_thread_lwp(thr) ((struct lwp_info *) (thread_target_data (thr)))
720 #define get_lwp_thread(lwp) ((lwp)->thread)
722 /* This struct is recorded in the target_data field of struct thread_info.
724 On linux ``all_threads'' is keyed by the LWP ID, which we use as the
725 GDB protocol representation of the thread ID. Threads also have
726 a "process ID" (poorly named) which is (presently) the same as the
729 There is also ``all_processes'' is keyed by the "overall process ID",
730 which GNU/Linux calls tgid, "thread group ID". */
734 /* Backlink to the parent object. */
735 struct thread_info
*thread
;
737 /* If this flag is set, the next SIGSTOP will be ignored (the
738 process will be immediately resumed). This means that either we
739 sent the SIGSTOP to it ourselves and got some other pending event
740 (so the SIGSTOP is still pending), or that we stopped the
741 inferior implicitly via PTRACE_ATTACH and have not waited for it
745 /* When this is true, we shall not try to resume this thread, even
746 if last_resume_kind isn't resume_stop. */
749 /* If this flag is set, the lwp is known to be stopped right now (stop
750 event already received in a wait()). */
753 /* Signal whether we are in a SYSCALL_ENTRY or
754 in a SYSCALL_RETURN event.
756 - TARGET_WAITKIND_SYSCALL_ENTRY
757 - TARGET_WAITKIND_SYSCALL_RETURN */
758 enum target_waitkind syscall_state
;
760 /* When stopped is set, the last wait status recorded for this lwp. */
763 /* If WAITSTATUS->KIND != TARGET_WAITKIND_IGNORE, the waitstatus for
764 this LWP's last event, to pass to GDB without any further
765 processing. This is used to store extended ptrace event
766 information or exit status until it can be reported to GDB. */
767 struct target_waitstatus waitstatus
;
769 /* A pointer to the fork child/parent relative. Valid only while
770 the parent fork event is not reported to higher layers. Used to
771 avoid wildcard vCont actions resuming a fork child before GDB is
772 notified about the parent's fork event. */
773 struct lwp_info
*fork_relative
;
775 /* When stopped is set, this is where the lwp last stopped, with
776 decr_pc_after_break already accounted for. If the LWP is
777 running, this is the address at which the lwp was resumed. */
780 /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
782 int status_pending_p
;
785 /* The reason the LWP last stopped, if we need to track it
786 (breakpoint, watchpoint, etc.) */
787 enum target_stop_reason stop_reason
;
789 /* On architectures where it is possible to know the data address of
790 a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
791 contains such data address. Only valid if STOPPED_BY_WATCHPOINT
793 CORE_ADDR stopped_data_address
;
795 /* If this is non-zero, it is a breakpoint to be reinserted at our next
796 stop (SIGTRAP stops only). */
797 CORE_ADDR bp_reinsert
;
799 /* If this flag is set, the last continue operation at the ptrace
800 level on this process was a single-step. */
803 /* Range to single step within. This is a copy of the step range
804 passed along the last resume request. See 'struct
806 CORE_ADDR step_range_start
; /* Inclusive */
807 CORE_ADDR step_range_end
; /* Exclusive */
809 /* If this flag is set, we need to set the event request flags the
810 next time we see this LWP stop. */
811 int must_set_ptrace_flags
;
813 /* If this is non-zero, it points to a chain of signals which need to
814 be delivered to this process. */
815 struct pending_signals
*pending_signals
;
817 /* A link used when resuming. It is initialized from the resume request,
818 and then processed and cleared in linux_resume_one_lwp. */
819 struct thread_resume
*resume
;
821 /* Information bout this lwp's fast tracepoint collection status (is it
822 currently stopped in the jump pad, and if so, before or at/after the
823 relocated instruction). Normally, we won't care about this, but we will
824 if a signal arrives to this lwp while it is collecting. */
825 fast_tpoint_collect_result collecting_fast_tracepoint
;
827 /* If this is non-zero, it points to a chain of signals which need
828 to be reported to GDB. These were deferred because the thread
829 was doing a fast tracepoint collect when they arrived. */
830 struct pending_signals
*pending_signals_to_report
;
832 /* When collecting_fast_tracepoint is first found to be 1, we insert
833 a exit-jump-pad-quickly breakpoint. This is it. */
834 struct breakpoint
*exit_jump_pad_bkpt
;
838 /* The thread handle, used for e.g. TLS access. Only valid if
839 THREAD_KNOWN is set. */
842 /* The pthread_t handle. */
843 thread_t thread_handle
;
846 /* Arch-specific additions. */
847 struct arch_lwp_info
*arch_private
;
850 int linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
);
852 /* Attach to PTID. Returns 0 on success, non-zero otherwise (an
854 int linux_attach_lwp (ptid_t ptid
);
856 struct lwp_info
*find_lwp_pid (ptid_t ptid
);
857 /* For linux_stop_lwp see nat/linux-nat.h. */
859 #ifdef HAVE_LINUX_REGSETS
860 void initialize_regsets_info (struct regsets_info
*regsets_info
);
863 void initialize_low_arch (void);
865 void linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
);
866 CORE_ADDR
linux_get_pc_32bit (struct regcache
*regcache
);
868 void linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
);
869 CORE_ADDR
linux_get_pc_64bit (struct regcache
*regcache
);
871 /* From thread-db.c */
872 int thread_db_init (void);
873 void thread_db_detach (struct process_info
*);
874 void thread_db_mourn (struct process_info
*);
875 int thread_db_handle_monitor_command (char *);
876 int thread_db_get_tls_address (struct thread_info
*thread
, CORE_ADDR offset
,
877 CORE_ADDR load_module
, CORE_ADDR
*address
);
878 int thread_db_look_up_one_symbol (const char *name
, CORE_ADDR
*addrp
);
880 /* Called from linux-low.c when a clone event is detected. Upon entry,
881 both the clone and the parent should be stopped. This function does
882 whatever is required have the clone under thread_db's control. */
884 void thread_db_notice_clone (struct thread_info
*parent_thr
, ptid_t child_ptid
);
886 bool thread_db_thread_handle (ptid_t ptid
, gdb_byte
**handle
, int *handle_len
);
888 extern int have_ptrace_getregset
;
890 /* Search for the value with type MATCH in the auxv vector with
891 entries of length WORDSIZE bytes. If found, store the value in
892 *VALP and return 1. If not found or if there is an error, return
895 int linux_get_auxv (int wordsize
, CORE_ADDR match
,
898 /* Fetch the AT_HWCAP entry from the auxv vector, where entries are length
899 WORDSIZE. If no entry was found, return zero. */
901 CORE_ADDR
linux_get_hwcap (int wordsize
);
903 /* Fetch the AT_HWCAP2 entry from the auxv vector, where entries are length
904 WORDSIZE. If no entry was found, return zero. */
906 CORE_ADDR
linux_get_hwcap2 (int wordsize
);
908 #endif /* GDBSERVER_LINUX_LOW_H */