1 /* Internal interfaces for the GNU/Linux specific target code for gdbserver.
2 Copyright (C) 2002-2015 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 "nat/linux-nat.h"
20 #include "nat/gdb_thread_db.h"
23 #include "gdbthread.h"
24 #include "gdb_proc_service.h"
26 /* Included for ptrace type definitions. */
27 #include "nat/linux-ptrace.h"
28 #include "target/waitstatus.h" /* For enum target_stop_reason. */
30 #define PTRACE_XFER_TYPE long
32 #ifdef HAVE_LINUX_REGSETS
33 typedef void (*regset_fill_func
) (struct regcache
*, void *);
34 typedef void (*regset_store_func
) (struct regcache
*, const void *);
43 int get_request
, set_request
;
44 /* If NT_TYPE isn't 0, it will be passed to ptrace as the 3rd
45 argument and the 4th argument should be "const struct iovec *". */
48 enum regset_type type
;
49 regset_fill_func fill_function
;
50 regset_store_func store_function
;
53 /* Aggregation of all the supported regsets of a given
58 /* The regsets array. */
59 struct regset_info
*regsets
;
61 /* The number of regsets in the REGSETS array. */
64 /* If we get EIO on a regset, do not try it again. Note the set of
65 supported regsets may depend on processor mode on biarch
66 machines. This is a (lazily allocated) array holding one boolean
67 byte (0/1) per regset, with each element corresponding to the
68 regset in the REGSETS array above at the same offset. */
69 char *disabled_regsets
;
74 /* Mapping between the general-purpose registers in `struct user'
75 format and GDB's register array layout. */
79 /* The number of registers accessible. */
82 /* The registers map. */
86 /* All info needed to access an architecture/mode's registers. */
90 /* Regset support bitmap: 1 for registers that are transferred as a part
91 of a regset, 0 for ones that need to be handled individually. This
92 can be NULL if all registers are transferred with regsets or regsets
94 unsigned char *regset_bitmap
;
96 /* Info used when accessing registers with PTRACE_PEEKUSER /
97 PTRACE_POKEUSER. This can be NULL if all registers are
98 transferred with regsets .*/
99 struct usrregs_info
*usrregs
;
101 #ifdef HAVE_LINUX_REGSETS
102 /* Info used when accessing registers with regsets. */
103 struct regsets_info
*regsets_info
;
107 struct process_info_private
109 /* Arch-specific additions. */
110 struct arch_process_info
*arch_private
;
112 /* libthread_db-specific additions. Not NULL if this process has loaded
113 thread_db, and it is active. */
114 struct thread_db
*thread_db
;
116 /* &_r_debug. 0 if not yet determined. -1 if no PT_DYNAMIC in Phdrs. */
119 /* This flag is true iff we've just created or attached to the first
120 LWP of this process but it has not stopped yet. As soon as it
121 does, we need to call the low target's arch_setup callback. */
127 struct linux_target_ops
129 /* Architecture-specific setup. */
130 void (*arch_setup
) (void);
132 const struct regs_info
*(*regs_info
) (void);
133 int (*cannot_fetch_register
) (int);
135 /* Returns 0 if we can store the register, 1 if we can not
136 store the register, and 2 if failure to store the register
138 int (*cannot_store_register
) (int);
140 /* Hook to fetch a register in some non-standard way. Used for
141 example by backends that have read-only registers with hardcoded
142 values (e.g., IA64's gr0/fr0/fr1). Returns true if register
143 REGNO was supplied, false if not, and we should fallback to the
144 standard ptrace methods. */
145 int (*fetch_register
) (struct regcache
*regcache
, int regno
);
147 CORE_ADDR (*get_pc
) (struct regcache
*regcache
);
148 void (*set_pc
) (struct regcache
*regcache
, CORE_ADDR newpc
);
149 const unsigned char *breakpoint
;
151 CORE_ADDR (*breakpoint_reinsert_addr
) (void);
153 int decr_pc_after_break
;
154 int (*breakpoint_at
) (CORE_ADDR pc
);
156 /* Breakpoint and watchpoint related functions. See target.h for
158 int (*supports_z_point_type
) (char z_type
);
159 int (*insert_point
) (enum raw_bkpt_type type
, CORE_ADDR addr
,
160 int size
, struct raw_breakpoint
*bp
);
161 int (*remove_point
) (enum raw_bkpt_type type
, CORE_ADDR addr
,
162 int size
, struct raw_breakpoint
*bp
);
164 int (*stopped_by_watchpoint
) (void);
165 CORE_ADDR (*stopped_data_address
) (void);
167 /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
168 for registers smaller than an xfer unit). */
169 void (*collect_ptrace_register
) (struct regcache
*regcache
,
170 int regno
, char *buf
);
171 void (*supply_ptrace_register
) (struct regcache
*regcache
,
172 int regno
, const char *buf
);
174 /* Hook to convert from target format to ptrace format and back.
175 Returns true if any conversion was done; false otherwise.
176 If DIRECTION is 1, then copy from INF to NATIVE.
177 If DIRECTION is 0, copy from NATIVE to INF. */
178 int (*siginfo_fixup
) (siginfo_t
*native
, void *inf
, int direction
);
180 /* Hook to call when a new process is created or attached to.
181 If extra per-process architecture-specific data is needed,
183 struct arch_process_info
* (*new_process
) (void);
185 /* Hook to call when a new thread is detected.
186 If extra per-thread architecture-specific data is needed,
188 void (*new_thread
) (struct lwp_info
*);
190 /* Hook to call, if any, when a new fork is attached. */
191 void (*new_fork
) (struct process_info
*parent
, struct process_info
*child
);
193 /* Hook to call prior to resuming a thread. */
194 void (*prepare_to_resume
) (struct lwp_info
*);
196 /* Hook to support target specific qSupported. */
197 void (*process_qsupported
) (const char *);
199 /* Returns true if the low target supports tracepoints. */
200 int (*supports_tracepoints
) (void);
202 /* Fill ADDRP with the thread area address of LWPID. Returns 0 on
203 success, -1 on failure. */
204 int (*get_thread_area
) (int lwpid
, CORE_ADDR
*addrp
);
206 /* Install a fast tracepoint jump pad. See target.h for
208 int (*install_fast_tracepoint_jump_pad
) (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
212 CORE_ADDR
*jump_entry
,
213 CORE_ADDR
*trampoline
,
214 ULONGEST
*trampoline_size
,
215 unsigned char *jjump_pad_insn
,
216 ULONGEST
*jjump_pad_insn_size
,
217 CORE_ADDR
*adjusted_insn_addr
,
218 CORE_ADDR
*adjusted_insn_addr_end
,
221 /* Return the bytecode operations vector for the current inferior.
222 Returns NULL if bytecode compilation is not supported. */
223 struct emit_ops
*(*emit_ops
) (void);
225 /* Return the minimum length of an instruction that can be safely overwritten
226 for use as a fast tracepoint. */
227 int (*get_min_fast_tracepoint_insn_len
) (void);
229 /* Returns true if the low target supports range stepping. */
230 int (*supports_range_stepping
) (void);
233 extern struct linux_target_ops the_low_target
;
235 #define get_thread_lwp(thr) ((struct lwp_info *) (inferior_target_data (thr)))
236 #define get_lwp_thread(lwp) ((lwp)->thread)
238 /* This struct is recorded in the target_data field of struct thread_info.
240 On linux ``all_threads'' is keyed by the LWP ID, which we use as the
241 GDB protocol representation of the thread ID. Threads also have
242 a "process ID" (poorly named) which is (presently) the same as the
245 There is also ``all_processes'' is keyed by the "overall process ID",
246 which GNU/Linux calls tgid, "thread group ID". */
250 /* Backlink to the parent object. */
251 struct thread_info
*thread
;
253 /* If this flag is set, the next SIGSTOP will be ignored (the
254 process will be immediately resumed). This means that either we
255 sent the SIGSTOP to it ourselves and got some other pending event
256 (so the SIGSTOP is still pending), or that we stopped the
257 inferior implicitly via PTRACE_ATTACH and have not waited for it
261 /* When this is true, we shall not try to resume this thread, even
262 if last_resume_kind isn't resume_stop. */
265 /* If this flag is set, the lwp is known to be stopped right now (stop
266 event already received in a wait()). */
269 /* If this flag is set, the lwp is known to be dead already (exit
270 event already received in a wait(), and is cached in
274 /* When stopped is set, the last wait status recorded for this lwp. */
277 /* This is used to store extended ptrace event information until
278 it is reported to GDB. */
279 struct target_waitstatus waitstatus
;
281 /* When stopped is set, this is where the lwp last stopped, with
282 decr_pc_after_break already accounted for. If the LWP is
283 running, this is the address at which the lwp was resumed. */
286 /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
288 int status_pending_p
;
291 /* The reason the LWP last stopped, if we need to track it
292 (breakpoint, watchpoint, etc.) */
293 enum target_stop_reason stop_reason
;
295 /* On architectures where it is possible to know the data address of
296 a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
297 contains such data address. Only valid if STOPPED_BY_WATCHPOINT
299 CORE_ADDR stopped_data_address
;
301 /* If this is non-zero, it is a breakpoint to be reinserted at our next
302 stop (SIGTRAP stops only). */
303 CORE_ADDR bp_reinsert
;
305 /* If this flag is set, the last continue operation at the ptrace
306 level on this process was a single-step. */
309 /* Range to single step within. This is a copy of the step range
310 passed along the last resume request. See 'struct
312 CORE_ADDR step_range_start
; /* Inclusive */
313 CORE_ADDR step_range_end
; /* Exclusive */
315 /* If this flag is set, we need to set the event request flags the
316 next time we see this LWP stop. */
317 int must_set_ptrace_flags
;
319 /* If this is non-zero, it points to a chain of signals which need to
320 be delivered to this process. */
321 struct pending_signals
*pending_signals
;
323 /* A link used when resuming. It is initialized from the resume request,
324 and then processed and cleared in linux_resume_one_lwp. */
325 struct thread_resume
*resume
;
327 /* True if it is known that this lwp is presently collecting a fast
328 tracepoint (it is in the jump pad or in some code that will
329 return to the jump pad. Normally, we won't care about this, but
330 we will if a signal arrives to this lwp while it is
332 int collecting_fast_tracepoint
;
334 /* If this is non-zero, it points to a chain of signals which need
335 to be reported to GDB. These were deferred because the thread
336 was doing a fast tracepoint collect when they arrived. */
337 struct pending_signals
*pending_signals_to_report
;
339 /* When collecting_fast_tracepoint is first found to be 1, we insert
340 a exit-jump-pad-quickly breakpoint. This is it. */
341 struct breakpoint
*exit_jump_pad_bkpt
;
343 /* True if the LWP was seen stop at an internal breakpoint and needs
344 stepping over later when it is resumed. */
349 /* The thread handle, used for e.g. TLS access. Only valid if
350 THREAD_KNOWN is set. */
354 /* Arch-specific additions. */
355 struct arch_lwp_info
*arch_private
;
358 int linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
);
360 /* Attach to PTID. Returns 0 on success, non-zero otherwise (an
362 int linux_attach_lwp (ptid_t ptid
);
364 struct lwp_info
*find_lwp_pid (ptid_t ptid
);
365 /* For linux_stop_lwp see nat/linux-nat.h. */
367 #ifdef HAVE_LINUX_REGSETS
368 void initialize_regsets_info (struct regsets_info
*regsets_info
);
371 void initialize_low_arch (void);
373 /* From thread-db.c */
374 int thread_db_init (int use_events
);
375 void thread_db_detach (struct process_info
*);
376 void thread_db_mourn (struct process_info
*);
377 int thread_db_handle_monitor_command (char *);
378 int thread_db_get_tls_address (struct thread_info
*thread
, CORE_ADDR offset
,
379 CORE_ADDR load_module
, CORE_ADDR
*address
);
380 int thread_db_look_up_one_symbol (const char *name
, CORE_ADDR
*addrp
);