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. */
122 struct linux_target_ops
124 /* Architecture-specific setup. */
125 void (*arch_setup
) (void);
127 const struct regs_info
*(*regs_info
) (void);
128 int (*cannot_fetch_register
) (int);
130 /* Returns 0 if we can store the register, 1 if we can not
131 store the register, and 2 if failure to store the register
133 int (*cannot_store_register
) (int);
135 /* Hook to fetch a register in some non-standard way. Used for
136 example by backends that have read-only registers with hardcoded
137 values (e.g., IA64's gr0/fr0/fr1). Returns true if register
138 REGNO was supplied, false if not, and we should fallback to the
139 standard ptrace methods. */
140 int (*fetch_register
) (struct regcache
*regcache
, int regno
);
142 CORE_ADDR (*get_pc
) (struct regcache
*regcache
);
143 void (*set_pc
) (struct regcache
*regcache
, CORE_ADDR newpc
);
145 /* See target.h for details. */
146 int (*breakpoint_kind_from_pc
) (CORE_ADDR
*pcptr
);
148 /* See target.h for details. */
149 const gdb_byte
*(*sw_breakpoint_from_kind
) (int kind
, int *size
);
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 /* When stopped is set, the last wait status recorded for this lwp. */
272 /* If WAITSTATUS->KIND != TARGET_WAITKIND_IGNORE, the waitstatus for
273 this LWP's last event, to pass to GDB without any further
274 processing. This is used to store extended ptrace event
275 information or exit status until it can be reported to GDB. */
276 struct target_waitstatus waitstatus
;
278 /* When stopped is set, this is where the lwp last stopped, with
279 decr_pc_after_break already accounted for. If the LWP is
280 running, this is the address at which the lwp was resumed. */
283 /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
285 int status_pending_p
;
288 /* The reason the LWP last stopped, if we need to track it
289 (breakpoint, watchpoint, etc.) */
290 enum target_stop_reason stop_reason
;
292 /* On architectures where it is possible to know the data address of
293 a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
294 contains such data address. Only valid if STOPPED_BY_WATCHPOINT
296 CORE_ADDR stopped_data_address
;
298 /* If this is non-zero, it is a breakpoint to be reinserted at our next
299 stop (SIGTRAP stops only). */
300 CORE_ADDR bp_reinsert
;
302 /* If this flag is set, the last continue operation at the ptrace
303 level on this process was a single-step. */
306 /* Range to single step within. This is a copy of the step range
307 passed along the last resume request. See 'struct
309 CORE_ADDR step_range_start
; /* Inclusive */
310 CORE_ADDR step_range_end
; /* Exclusive */
312 /* If this flag is set, we need to set the event request flags the
313 next time we see this LWP stop. */
314 int must_set_ptrace_flags
;
316 /* If this is non-zero, it points to a chain of signals which need to
317 be delivered to this process. */
318 struct pending_signals
*pending_signals
;
320 /* A link used when resuming. It is initialized from the resume request,
321 and then processed and cleared in linux_resume_one_lwp. */
322 struct thread_resume
*resume
;
324 /* True if it is known that this lwp is presently collecting a fast
325 tracepoint (it is in the jump pad or in some code that will
326 return to the jump pad. Normally, we won't care about this, but
327 we will if a signal arrives to this lwp while it is
329 int collecting_fast_tracepoint
;
331 /* If this is non-zero, it points to a chain of signals which need
332 to be reported to GDB. These were deferred because the thread
333 was doing a fast tracepoint collect when they arrived. */
334 struct pending_signals
*pending_signals_to_report
;
336 /* When collecting_fast_tracepoint is first found to be 1, we insert
337 a exit-jump-pad-quickly breakpoint. This is it. */
338 struct breakpoint
*exit_jump_pad_bkpt
;
340 /* True if the LWP was seen stop at an internal breakpoint and needs
341 stepping over later when it is resumed. */
346 /* The thread handle, used for e.g. TLS access. Only valid if
347 THREAD_KNOWN is set. */
351 /* Arch-specific additions. */
352 struct arch_lwp_info
*arch_private
;
355 int linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
);
357 /* Attach to PTID. Returns 0 on success, non-zero otherwise (an
359 int linux_attach_lwp (ptid_t ptid
);
361 struct lwp_info
*find_lwp_pid (ptid_t ptid
);
362 /* For linux_stop_lwp see nat/linux-nat.h. */
364 #ifdef HAVE_LINUX_REGSETS
365 void initialize_regsets_info (struct regsets_info
*regsets_info
);
368 void initialize_low_arch (void);
370 /* From thread-db.c */
371 int thread_db_init (int use_events
);
372 void thread_db_detach (struct process_info
*);
373 void thread_db_mourn (struct process_info
*);
374 int thread_db_handle_monitor_command (char *);
375 int thread_db_get_tls_address (struct thread_info
*thread
, CORE_ADDR offset
,
376 CORE_ADDR load_module
, CORE_ADDR
*address
);
377 int thread_db_look_up_one_symbol (const char *name
, CORE_ADDR
*addrp
);
379 extern int have_ptrace_getregset
;