1 /* Target operations for the remote server for GDB.
2 Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
5 Contributed by MontaVista Software.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
25 /* Ways to "resume" a thread. */
29 /* Thread should continue. */
32 /* Thread should single-step. */
35 /* Thread should be stopped. */
39 /* This structure describes how to resume a particular thread (or all
40 threads) based on the client's request. If thread is -1, then this
41 entry applies to all threads. These are passed around as an
48 /* How to "resume". */
49 enum resume_kind kind;
51 /* If non-zero, send this signal when we resume, or to stop the
52 thread. If stopping a thread, and this is 0, the target should
53 stop the thread however it best decides to (e.g., SIGSTOP on
54 linux; SuspendThread on win32). */
58 /* Generally, what has the program done? */
61 /* The program has exited. The exit status is in
63 TARGET_WAITKIND_EXITED,
65 /* The program has stopped with a signal. Which signal is in
67 TARGET_WAITKIND_STOPPED,
69 /* The program has terminated with a signal. Which signal is in
71 TARGET_WAITKIND_SIGNALLED,
73 /* The program is letting us know that it dynamically loaded
75 TARGET_WAITKIND_LOADED,
77 /* The program has exec'ed a new executable file. The new file's
78 pathname is pointed to by value.execd_pathname. */
79 TARGET_WAITKIND_EXECD,
81 /* Nothing of interest to GDB happened, but we stopped anyway. */
82 TARGET_WAITKIND_SPURIOUS,
84 /* An event has occurred, but we should wait again. In this case,
85 we want to go back to the event loop and wait there for another
86 event from the inferior. */
87 TARGET_WAITKIND_IGNORE
90 struct target_waitstatus
92 enum target_waitkind kind;
94 /* Forked child pid, execd pathname, exit status or signal number. */
98 enum target_signal sig;
100 char *execd_pathname;
105 /* Options that can be passed to target_ops->wait. */
107 #define TARGET_WNOHANG 1
111 /* Start a new process.
113 PROGRAM is a path to the program to execute.
114 ARGS is a standard NULL-terminated array of arguments,
115 to be passed to the inferior as ``argv''.
117 Returns the new PID on success, -1 on failure. Registers the new
118 process with the process list. */
120 int (*create_inferior) (char *program, char **args);
122 /* Attach to a running process.
124 PID is the process ID to attach to, specified by the user
127 Returns -1 if attaching is unsupported, 0 on success, and calls
128 error() otherwise. */
130 int (*attach) (unsigned long pid);
132 /* Kill inferior PID. Return -1 on failure, and 0 on success. */
134 int (*kill) (int pid);
136 /* Detach from inferior PID. Return -1 on failure, and 0 on
139 int (*detach) (int pid);
141 /* The inferior process has died. Do what is right. */
143 void (*mourn) (struct process_info *proc);
145 /* Wait for inferior PID to exit. */
146 void (*join) (int pid);
148 /* Return 1 iff the thread with process ID PID is alive. */
150 int (*thread_alive) (ptid_t pid);
152 /* Resume the inferior process. */
154 void (*resume) (struct thread_resume *resume_info, size_t n);
156 /* Wait for the inferior process or thread to change state. Store
157 status through argument pointer STATUS.
159 PTID = -1 to wait for any pid to do something, PTID(pid,0,0) to
160 wait for any thread of process pid to do something. Return ptid
161 of child, or -1 in case of error; store status through argument
162 pointer STATUS. OPTIONS is a bit set of options defined as
163 TARGET_W* above. If options contains TARGET_WNOHANG and there's
164 no child stop to report, return is
165 null_ptid/TARGET_WAITKIND_IGNORE. */
167 ptid_t (*wait) (ptid_t ptid, struct target_waitstatus *status, int options);
169 /* Fetch registers from the inferior process.
171 If REGNO is -1, fetch all registers; otherwise, fetch at least REGNO. */
173 void (*fetch_registers) (struct regcache *regcache, int regno);
175 /* Store registers to the inferior process.
177 If REGNO is -1, store all registers; otherwise, store at least REGNO. */
179 void (*store_registers) (struct regcache *regcache, int regno);
181 /* Read memory from the inferior process. This should generally be
182 called through read_inferior_memory, which handles breakpoint shadowing.
184 Read LEN bytes at MEMADDR into a buffer at MYADDR.
186 Returns 0 on success and errno on failure. */
188 int (*read_memory) (CORE_ADDR memaddr, unsigned char *myaddr, int len);
190 /* Write memory to the inferior process. This should generally be
191 called through write_inferior_memory, which handles breakpoint shadowing.
193 Write LEN bytes from the buffer at MYADDR to MEMADDR.
195 Returns 0 on success and errno on failure. */
197 int (*write_memory) (CORE_ADDR memaddr, const unsigned char *myaddr,
200 /* Query GDB for the values of any symbols we're interested in.
201 This function is called whenever we receive a "qSymbols::"
202 query, which corresponds to every time more symbols (might)
203 become available. NULL if we aren't interested in any
206 void (*look_up_symbols) (void);
208 /* Send an interrupt request to the inferior process,
209 however is appropriate. */
211 void (*request_interrupt) (void);
213 /* Read auxiliary vector data from the inferior process.
215 Read LEN bytes at OFFSET into a buffer at MYADDR. */
217 int (*read_auxv) (CORE_ADDR offset, unsigned char *myaddr,
220 /* Insert and remove a break or watchpoint.
221 Returns 0 on success, -1 on failure and 1 on unsupported.
222 The type is coded as follows:
223 '0' - software-breakpoint
224 '1' - hardware-breakpoint
225 '2' - write watchpoint
226 '3' - read watchpoint
227 '4' - access watchpoint */
229 int (*insert_point) (char type, CORE_ADDR addr, int len);
230 int (*remove_point) (char type, CORE_ADDR addr, int len);
232 /* Returns 1 if target was stopped due to a watchpoint hit, 0 otherwise. */
234 int (*stopped_by_watchpoint) (void);
236 /* Returns the address associated with the watchpoint that hit, if any;
237 returns 0 otherwise. */
239 CORE_ADDR (*stopped_data_address) (void);
241 /* Reports the text, data offsets of the executable. This is
242 needed for uclinux where the executable is relocated during load
245 int (*read_offsets) (CORE_ADDR *text, CORE_ADDR *data);
247 /* Fetch the address associated with a specific thread local storage
248 area, determined by the specified THREAD, OFFSET, and LOAD_MODULE.
249 Stores it in *ADDRESS and returns zero on success; otherwise returns
250 an error code. A return value of -1 means this system does not
251 support the operation. */
253 int (*get_tls_address) (struct thread_info *thread, CORE_ADDR offset,
254 CORE_ADDR load_module, CORE_ADDR *address);
256 /* Read/Write from/to spufs using qXfer packets. */
257 int (*qxfer_spu) (const char *annex, unsigned char *readbuf,
258 unsigned const char *writebuf, CORE_ADDR offset, int len);
260 /* Fill BUF with an hostio error packet representing the last hostio
262 void (*hostio_last_error) (char *buf);
264 /* Read/Write OS data using qXfer packets. */
265 int (*qxfer_osdata) (const char *annex, unsigned char *readbuf,
266 unsigned const char *writebuf, CORE_ADDR offset,
269 /* Read/Write extra signal info. */
270 int (*qxfer_siginfo) (const char *annex, unsigned char *readbuf,
271 unsigned const char *writebuf,
272 CORE_ADDR offset, int len);
274 int (*supports_non_stop) (void);
276 /* Enables async target events. Returns the previous enable
278 int (*async) (int enable);
280 /* Switch to non-stop (1) or all-stop (0) mode. Return 0 on
281 success, -1 otherwise. */
282 int (*start_non_stop) (int);
284 /* Returns true if the target supports multi-process debugging. */
285 int (*supports_multi_process) (void);
287 /* If not NULL, target-specific routine to process monitor command.
288 Returns 1 if handled, or 0 to perform default processing. */
289 int (*handle_monitor_command) (char *);
291 /* Returns the core given a thread, or -1 if not known. */
292 int (*core_of_thread) (ptid_t);
294 /* Target specific qSupported support. */
295 void (*process_qsupported) (const char *);
297 /* Return 1 if the target supports tracepoints, 0 (or leave the
298 callback NULL) otherwise. */
299 int (*supports_tracepoints) (void);
301 /* Read PC from REGCACHE. */
302 CORE_ADDR (*read_pc) (struct regcache *regcache);
304 /* Write PC to REGCACHE. */
305 void (*write_pc) (struct regcache *regcache, CORE_ADDR pc);
307 /* Return true if THREAD is known to be stopped now. */
308 int (*thread_stopped) (struct thread_info *thread);
310 /* Read Thread Information Block address. */
311 int (*get_tib_address) (ptid_t ptid, CORE_ADDR *address);
313 /* Pause all threads. If FREEZE, arrange for any resume attempt be
314 be ignored until an unpause_all call unfreezes threads again.
315 There can be nested calls to pause_all, so a freeze counter
316 should be maintained. */
317 void (*pause_all) (int freeze);
319 /* Unpause all threads. Threads that hadn't been resumed by the
320 client should be left stopped. Basically a pause/unpause call
321 pair should not end up resuming threads that were stopped before
323 void (*unpause_all) (int unfreeze);
325 /* Cancel all pending breakpoints hits in all threads. */
326 void (*cancel_breakpoints) (void);
329 extern struct target_ops *the_target;
331 void set_target_ops (struct target_ops *);
333 #define create_inferior(program, args) \
334 (*the_target->create_inferior) (program, args)
336 #define myattach(pid) \
337 (*the_target->attach) (pid)
339 #define kill_inferior(pid) \
340 (*the_target->kill) (pid)
342 #define detach_inferior(pid) \
343 (*the_target->detach) (pid)
345 #define mourn_inferior(PROC) \
346 (*the_target->mourn) (PROC)
348 #define mythread_alive(pid) \
349 (*the_target->thread_alive) (pid)
351 #define fetch_inferior_registers(regcache, regno) \
352 (*the_target->fetch_registers) (regcache, regno)
354 #define store_inferior_registers(regcache, regno) \
355 (*the_target->store_registers) (regcache, regno)
357 #define join_inferior(pid) \
358 (*the_target->join) (pid)
360 #define target_supports_non_stop() \
361 (the_target->supports_non_stop ? (*the_target->supports_non_stop ) () : 0)
363 #define target_async(enable) \
364 (the_target->async ? (*the_target->async) (enable) : 0)
366 #define target_supports_multi_process() \
367 (the_target->supports_multi_process ? \
368 (*the_target->supports_multi_process) () : 0)
370 #define target_process_qsupported(query) \
373 if (the_target->process_qsupported) \
374 the_target->process_qsupported (query); \
377 #define target_supports_tracepoints() \
378 (the_target->supports_tracepoints \
379 ? (*the_target->supports_tracepoints) () : 0)
381 #define thread_stopped(thread) \
382 (*the_target->thread_stopped) (thread)
384 #define pause_all(freeze) \
387 if (the_target->pause_all) \
388 (*the_target->pause_all) (freeze); \
391 #define unpause_all(unfreeze) \
394 if (the_target->unpause_all) \
395 (*the_target->unpause_all) (unfreeze); \
398 #define cancel_breakpoints() \
401 if (the_target->cancel_breakpoints) \
402 (*the_target->cancel_breakpoints) (); \
405 /* Start non-stop mode, returns 0 on success, -1 on failure. */
407 int start_non_stop (int nonstop);
409 ptid_t mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options,
412 int read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len);
414 int write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
417 void set_desired_inferior (int id);
419 const char *target_pid_to_str (ptid_t);
421 const char *target_waitstatus_to_string (const struct target_waitstatus *);
423 #endif /* TARGET_H */