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 *);
41 /* The arch's regsets array initializer must be terminated with a NULL
44 { 0, 0, 0, -1, (enum regset_type) -1, NULL, NULL }
48 int get_request
, set_request
;
49 /* If NT_TYPE isn't 0, it will be passed to ptrace as the 3rd
50 argument and the 4th argument should be "const struct iovec *". */
53 enum regset_type type
;
54 regset_fill_func fill_function
;
55 regset_store_func store_function
;
58 /* Aggregation of all the supported regsets of a given
63 /* The regsets array. */
64 struct regset_info
*regsets
;
66 /* The number of regsets in the REGSETS array. */
69 /* If we get EIO on a regset, do not try it again. Note the set of
70 supported regsets may depend on processor mode on biarch
71 machines. This is a (lazily allocated) array holding one boolean
72 byte (0/1) per regset, with each element corresponding to the
73 regset in the REGSETS array above at the same offset. */
74 char *disabled_regsets
;
79 /* Mapping between the general-purpose registers in `struct user'
80 format and GDB's register array layout. */
84 /* The number of registers accessible. */
87 /* The registers map. */
91 /* All info needed to access an architecture/mode's registers. */
95 /* Regset support bitmap: 1 for registers that are transferred as a part
96 of a regset, 0 for ones that need to be handled individually. This
97 can be NULL if all registers are transferred with regsets or regsets
99 unsigned char *regset_bitmap
;
101 /* Info used when accessing registers with PTRACE_PEEKUSER /
102 PTRACE_POKEUSER. This can be NULL if all registers are
103 transferred with regsets .*/
104 struct usrregs_info
*usrregs
;
106 #ifdef HAVE_LINUX_REGSETS
107 /* Info used when accessing registers with regsets. */
108 struct regsets_info
*regsets_info
;
112 struct process_info_private
114 /* Arch-specific additions. */
115 struct arch_process_info
*arch_private
;
117 /* libthread_db-specific additions. Not NULL if this process has loaded
118 thread_db, and it is active. */
119 struct thread_db
*thread_db
;
121 /* &_r_debug. 0 if not yet determined. -1 if no PT_DYNAMIC in Phdrs. */
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
);
150 /* See target.h for details. */
151 int (*breakpoint_kind_from_pc
) (CORE_ADDR
*pcptr
);
153 /* See target.h for details. */
154 const gdb_byte
*(*sw_breakpoint_from_kind
) (int kind
, int *size
);
156 CORE_ADDR (*breakpoint_reinsert_addr
) (void);
158 int decr_pc_after_break
;
159 int (*breakpoint_at
) (CORE_ADDR pc
);
161 /* Breakpoint and watchpoint related functions. See target.h for
163 int (*supports_z_point_type
) (char z_type
);
164 int (*insert_point
) (enum raw_bkpt_type type
, CORE_ADDR addr
,
165 int size
, struct raw_breakpoint
*bp
);
166 int (*remove_point
) (enum raw_bkpt_type type
, CORE_ADDR addr
,
167 int size
, struct raw_breakpoint
*bp
);
169 int (*stopped_by_watchpoint
) (void);
170 CORE_ADDR (*stopped_data_address
) (void);
172 /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
173 for registers smaller than an xfer unit). */
174 void (*collect_ptrace_register
) (struct regcache
*regcache
,
175 int regno
, char *buf
);
176 void (*supply_ptrace_register
) (struct regcache
*regcache
,
177 int regno
, const char *buf
);
179 /* Hook to convert from target format to ptrace format and back.
180 Returns true if any conversion was done; false otherwise.
181 If DIRECTION is 1, then copy from INF to NATIVE.
182 If DIRECTION is 0, copy from NATIVE to INF. */
183 int (*siginfo_fixup
) (siginfo_t
*native
, void *inf
, int direction
);
185 /* Hook to call when a new process is created or attached to.
186 If extra per-process architecture-specific data is needed,
188 struct arch_process_info
* (*new_process
) (void);
190 /* Hook to call when a new thread is detected.
191 If extra per-thread architecture-specific data is needed,
193 void (*new_thread
) (struct lwp_info
*);
195 /* Hook to call, if any, when a new fork is attached. */
196 void (*new_fork
) (struct process_info
*parent
, struct process_info
*child
);
198 /* Hook to call prior to resuming a thread. */
199 void (*prepare_to_resume
) (struct lwp_info
*);
201 /* Hook to support target specific qSupported. */
202 void (*process_qsupported
) (char **, int count
);
204 /* Returns true if the low target supports tracepoints. */
205 int (*supports_tracepoints
) (void);
207 /* Fill ADDRP with the thread area address of LWPID. Returns 0 on
208 success, -1 on failure. */
209 int (*get_thread_area
) (int lwpid
, CORE_ADDR
*addrp
);
211 /* Install a fast tracepoint jump pad. See target.h for
213 int (*install_fast_tracepoint_jump_pad
) (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
217 CORE_ADDR
*jump_entry
,
218 CORE_ADDR
*trampoline
,
219 ULONGEST
*trampoline_size
,
220 unsigned char *jjump_pad_insn
,
221 ULONGEST
*jjump_pad_insn_size
,
222 CORE_ADDR
*adjusted_insn_addr
,
223 CORE_ADDR
*adjusted_insn_addr_end
,
226 /* Return the bytecode operations vector for the current inferior.
227 Returns NULL if bytecode compilation is not supported. */
228 struct emit_ops
*(*emit_ops
) (void);
230 /* Return the minimum length of an instruction that can be safely overwritten
231 for use as a fast tracepoint. */
232 int (*get_min_fast_tracepoint_insn_len
) (void);
234 /* Returns true if the low target supports range stepping. */
235 int (*supports_range_stepping
) (void);
238 int (*breakpoint_kind_from_current_state
) (CORE_ADDR
*pcptr
);
241 int (*supports_hardware_single_step
) (void);
244 extern struct linux_target_ops the_low_target
;
246 #define get_thread_lwp(thr) ((struct lwp_info *) (inferior_target_data (thr)))
247 #define get_lwp_thread(lwp) ((lwp)->thread)
249 /* This struct is recorded in the target_data field of struct thread_info.
251 On linux ``all_threads'' is keyed by the LWP ID, which we use as the
252 GDB protocol representation of the thread ID. Threads also have
253 a "process ID" (poorly named) which is (presently) the same as the
256 There is also ``all_processes'' is keyed by the "overall process ID",
257 which GNU/Linux calls tgid, "thread group ID". */
261 /* Backlink to the parent object. */
262 struct thread_info
*thread
;
264 /* If this flag is set, the next SIGSTOP will be ignored (the
265 process will be immediately resumed). This means that either we
266 sent the SIGSTOP to it ourselves and got some other pending event
267 (so the SIGSTOP is still pending), or that we stopped the
268 inferior implicitly via PTRACE_ATTACH and have not waited for it
272 /* When this is true, we shall not try to resume this thread, even
273 if last_resume_kind isn't resume_stop. */
276 /* If this flag is set, the lwp is known to be stopped right now (stop
277 event already received in a wait()). */
280 /* When stopped is set, the last wait status recorded for this lwp. */
283 /* If WAITSTATUS->KIND != TARGET_WAITKIND_IGNORE, the waitstatus for
284 this LWP's last event, to pass to GDB without any further
285 processing. This is used to store extended ptrace event
286 information or exit status until it can be reported to GDB. */
287 struct target_waitstatus waitstatus
;
289 /* When stopped is set, this is where the lwp last stopped, with
290 decr_pc_after_break already accounted for. If the LWP is
291 running, this is the address at which the lwp was resumed. */
294 /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
296 int status_pending_p
;
299 /* The reason the LWP last stopped, if we need to track it
300 (breakpoint, watchpoint, etc.) */
301 enum target_stop_reason stop_reason
;
303 /* On architectures where it is possible to know the data address of
304 a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
305 contains such data address. Only valid if STOPPED_BY_WATCHPOINT
307 CORE_ADDR stopped_data_address
;
309 /* If this is non-zero, it is a breakpoint to be reinserted at our next
310 stop (SIGTRAP stops only). */
311 CORE_ADDR bp_reinsert
;
313 /* If this flag is set, the last continue operation at the ptrace
314 level on this process was a single-step. */
317 /* Range to single step within. This is a copy of the step range
318 passed along the last resume request. See 'struct
320 CORE_ADDR step_range_start
; /* Inclusive */
321 CORE_ADDR step_range_end
; /* Exclusive */
323 /* If this flag is set, we need to set the event request flags the
324 next time we see this LWP stop. */
325 int must_set_ptrace_flags
;
327 /* If this is non-zero, it points to a chain of signals which need to
328 be delivered to this process. */
329 struct pending_signals
*pending_signals
;
331 /* A link used when resuming. It is initialized from the resume request,
332 and then processed and cleared in linux_resume_one_lwp. */
333 struct thread_resume
*resume
;
335 /* True if it is known that this lwp is presently collecting a fast
336 tracepoint (it is in the jump pad or in some code that will
337 return to the jump pad. Normally, we won't care about this, but
338 we will if a signal arrives to this lwp while it is
340 int collecting_fast_tracepoint
;
342 /* If this is non-zero, it points to a chain of signals which need
343 to be reported to GDB. These were deferred because the thread
344 was doing a fast tracepoint collect when they arrived. */
345 struct pending_signals
*pending_signals_to_report
;
347 /* When collecting_fast_tracepoint is first found to be 1, we insert
348 a exit-jump-pad-quickly breakpoint. This is it. */
349 struct breakpoint
*exit_jump_pad_bkpt
;
351 /* True if the LWP was seen stop at an internal breakpoint and needs
352 stepping over later when it is resumed. */
357 /* The thread handle, used for e.g. TLS access. Only valid if
358 THREAD_KNOWN is set. */
362 /* Arch-specific additions. */
363 struct arch_lwp_info
*arch_private
;
366 int linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
);
368 /* Attach to PTID. Returns 0 on success, non-zero otherwise (an
370 int linux_attach_lwp (ptid_t ptid
);
372 struct lwp_info
*find_lwp_pid (ptid_t ptid
);
373 /* For linux_stop_lwp see nat/linux-nat.h. */
375 #ifdef HAVE_LINUX_REGSETS
376 void initialize_regsets_info (struct regsets_info
*regsets_info
);
379 void initialize_low_arch (void);
381 /* From thread-db.c */
382 int thread_db_init (int use_events
);
383 void thread_db_detach (struct process_info
*);
384 void thread_db_mourn (struct process_info
*);
385 int thread_db_handle_monitor_command (char *);
386 int thread_db_get_tls_address (struct thread_info
*thread
, CORE_ADDR offset
,
387 CORE_ADDR load_module
, CORE_ADDR
*address
);
388 int thread_db_look_up_one_symbol (const char *name
, CORE_ADDR
*addrp
);
390 extern int have_ptrace_getregset
;