1 /* Internal interfaces for the GNU/Linux specific target code for gdbserver.
2 Copyright (C) 2002-2013 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 #include "gdb_thread_db.h"
22 #include "gdbthread.h"
23 #include "gdb_proc_service.h"
25 #define PTRACE_ARG3_TYPE void *
26 #define PTRACE_ARG4_TYPE void *
27 #define PTRACE_XFER_TYPE long
29 #ifdef HAVE_LINUX_REGSETS
30 typedef void (*regset_fill_func
) (struct regcache
*, void *);
31 typedef void (*regset_store_func
) (struct regcache
*, const void *);
40 int get_request
, set_request
;
41 /* If NT_TYPE isn't 0, it will be passed to ptrace as the 3rd
42 argument and the 4th argument should be "const struct iovec *". */
45 enum regset_type type
;
46 regset_fill_func fill_function
;
47 regset_store_func store_function
;
49 extern struct regset_info target_regsets
[];
52 struct process_info_private
54 /* Arch-specific additions. */
55 struct arch_process_info
*arch_private
;
57 /* libthread_db-specific additions. Not NULL if this process has loaded
58 thread_db, and it is active. */
59 struct thread_db
*thread_db
;
61 /* &_r_debug. 0 if not yet determined. -1 if no PT_DYNAMIC in Phdrs. */
67 struct linux_target_ops
69 /* Architecture-specific setup. */
70 void (*arch_setup
) (void);
75 /* Regset support bitmap: 1 for registers that are transferred as a part
76 of a regset, 0 for ones that need to be handled individually. This
77 can be NULL if all registers are transferred with regsets or regsets
79 unsigned char *regset_bitmap
;
80 int (*cannot_fetch_register
) (int);
82 /* Returns 0 if we can store the register, 1 if we can not
83 store the register, and 2 if failure to store the register
85 int (*cannot_store_register
) (int);
87 /* Hook to fetch a register in some non-standard way. Used for
88 example by backends that have read-only registers with hardcoded
89 values (e.g., IA64's gr0/fr0/fr1). Returns true if register
90 REGNO was supplied, false if not, and we should fallback to the
91 standard ptrace methods. */
92 int (*fetch_register
) (struct regcache
*regcache
, int regno
);
94 CORE_ADDR (*get_pc
) (struct regcache
*regcache
);
95 void (*set_pc
) (struct regcache
*regcache
, CORE_ADDR newpc
);
96 const unsigned char *breakpoint
;
98 CORE_ADDR (*breakpoint_reinsert_addr
) (void);
100 int decr_pc_after_break
;
101 int (*breakpoint_at
) (CORE_ADDR pc
);
103 /* Breakpoint and watchpoint related functions. See target.h for
105 int (*insert_point
) (char type
, CORE_ADDR addr
, int len
);
106 int (*remove_point
) (char type
, CORE_ADDR addr
, int len
);
107 int (*stopped_by_watchpoint
) (void);
108 CORE_ADDR (*stopped_data_address
) (void);
110 /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
111 for registers smaller than an xfer unit). */
112 void (*collect_ptrace_register
) (struct regcache
*regcache
,
113 int regno
, char *buf
);
114 void (*supply_ptrace_register
) (struct regcache
*regcache
,
115 int regno
, const char *buf
);
117 /* Hook to convert from target format to ptrace format and back.
118 Returns true if any conversion was done; false otherwise.
119 If DIRECTION is 1, then copy from INF to NATIVE.
120 If DIRECTION is 0, copy from NATIVE to INF. */
121 int (*siginfo_fixup
) (siginfo_t
*native
, void *inf
, int direction
);
123 /* Hook to call when a new process is created or attached to.
124 If extra per-process architecture-specific data is needed,
126 struct arch_process_info
* (*new_process
) (void);
128 /* Hook to call when a new thread is detected.
129 If extra per-thread architecture-specific data is needed,
131 struct arch_lwp_info
* (*new_thread
) (void);
133 /* Hook to call prior to resuming a thread. */
134 void (*prepare_to_resume
) (struct lwp_info
*);
136 /* Hook to support target specific qSupported. */
137 void (*process_qsupported
) (const char *);
139 /* Returns true if the low target supports tracepoints. */
140 int (*supports_tracepoints
) (void);
142 /* Fill ADDRP with the thread area address of LWPID. Returns 0 on
143 success, -1 on failure. */
144 int (*get_thread_area
) (int lwpid
, CORE_ADDR
*addrp
);
146 /* Install a fast tracepoint jump pad. See target.h for
148 int (*install_fast_tracepoint_jump_pad
) (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
152 CORE_ADDR
*jump_entry
,
153 CORE_ADDR
*trampoline
,
154 ULONGEST
*trampoline_size
,
155 unsigned char *jjump_pad_insn
,
156 ULONGEST
*jjump_pad_insn_size
,
157 CORE_ADDR
*adjusted_insn_addr
,
158 CORE_ADDR
*adjusted_insn_addr_end
,
161 /* Return the bytecode operations vector for the current inferior.
162 Returns NULL if bytecode compilation is not supported. */
163 struct emit_ops
*(*emit_ops
) (void);
165 /* Return the minimum length of an instruction that can be safely overwritten
166 for use as a fast tracepoint. */
167 int (*get_min_fast_tracepoint_insn_len
) (void);
171 extern struct linux_target_ops the_low_target
;
173 #define ptid_of(proc) ((proc)->head.id)
174 #define pid_of(proc) ptid_get_pid ((proc)->head.id)
175 #define lwpid_of(proc) ptid_get_lwp ((proc)->head.id)
177 #define get_lwp(inf) ((struct lwp_info *)(inf))
178 #define get_thread_lwp(thr) (get_lwp (inferior_target_data (thr)))
179 #define get_lwp_thread(proc) ((struct thread_info *) \
180 find_inferior_id (&all_threads, \
181 get_lwp (proc)->head.id))
185 struct inferior_list_entry head
;
187 /* If this flag is set, the next SIGSTOP will be ignored (the
188 process will be immediately resumed). This means that either we
189 sent the SIGSTOP to it ourselves and got some other pending event
190 (so the SIGSTOP is still pending), or that we stopped the
191 inferior implicitly via PTRACE_ATTACH and have not waited for it
195 /* When this is true, we shall not try to resume this thread, even
196 if last_resume_kind isn't resume_stop. */
199 /* If this flag is set, the lwp is known to be stopped right now (stop
200 event already received in a wait()). */
203 /* If this flag is set, the lwp is known to be dead already (exit
204 event already received in a wait(), and is cached in
208 /* When stopped is set, the last wait status recorded for this lwp. */
211 /* When stopped is set, this is where the lwp stopped, with
212 decr_pc_after_break already accounted for. */
215 /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
217 int status_pending_p
;
220 /* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
222 int stopped_by_watchpoint
;
224 /* On architectures where it is possible to know the data address of
225 a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
226 contains such data address. Only valid if STOPPED_BY_WATCHPOINT
228 CORE_ADDR stopped_data_address
;
230 /* If this is non-zero, it is a breakpoint to be reinserted at our next
231 stop (SIGTRAP stops only). */
232 CORE_ADDR bp_reinsert
;
234 /* If this flag is set, the last continue operation at the ptrace
235 level on this process was a single-step. */
238 /* If this flag is set, we need to set the event request flags the
239 next time we see this LWP stop. */
240 int must_set_ptrace_flags
;
242 /* If this is non-zero, it points to a chain of signals which need to
243 be delivered to this process. */
244 struct pending_signals
*pending_signals
;
246 /* A link used when resuming. It is initialized from the resume request,
247 and then processed and cleared in linux_resume_one_lwp. */
248 struct thread_resume
*resume
;
250 /* True if it is known that this lwp is presently collecting a fast
251 tracepoint (it is in the jump pad or in some code that will
252 return to the jump pad. Normally, we won't care about this, but
253 we will if a signal arrives to this lwp while it is
255 int collecting_fast_tracepoint
;
257 /* If this is non-zero, it points to a chain of signals which need
258 to be reported to GDB. These were deferred because the thread
259 was doing a fast tracepoint collect when they arrived. */
260 struct pending_signals
*pending_signals_to_report
;
262 /* When collecting_fast_tracepoint is first found to be 1, we insert
263 a exit-jump-pad-quickly breakpoint. This is it. */
264 struct breakpoint
*exit_jump_pad_bkpt
;
266 /* True if the LWP was seen stop at an internal breakpoint and needs
267 stepping over later when it is resumed. */
272 /* The thread handle, used for e.g. TLS access. Only valid if
273 THREAD_KNOWN is set. */
277 /* Arch-specific additions. */
278 struct arch_lwp_info
*arch_private
;
281 extern struct inferior_list all_lwps
;
283 int linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
);
285 void linux_attach_lwp (unsigned long pid
);
286 struct lwp_info
*find_lwp_pid (ptid_t ptid
);
287 void linux_stop_lwp (struct lwp_info
*lwp
);
289 /* From thread-db.c */
290 int thread_db_init (int use_events
);
291 void thread_db_detach (struct process_info
*);
292 void thread_db_mourn (struct process_info
*);
293 int thread_db_handle_monitor_command (char *);
294 int thread_db_get_tls_address (struct thread_info
*thread
, CORE_ADDR offset
,
295 CORE_ADDR load_module
, CORE_ADDR
*address
);
296 int thread_db_look_up_one_symbol (const char *name
, CORE_ADDR
*addrp
);