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58caa3dc | 1 | /* Internal interfaces for the GNU/Linux specific target code for gdbserver. |
b811d2c2 | 2 | Copyright (C) 2002-2020 Free Software Foundation, Inc. |
58caa3dc DJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
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 | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
58caa3dc DJ |
9 | (at your option) any later version. |
10 | ||
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. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
58caa3dc | 18 | |
1a5c2598 TT |
19 | #ifndef GDBSERVER_LINUX_LOW_H |
20 | #define GDBSERVER_LINUX_LOW_H | |
21 | ||
6d4ee8c6 | 22 | #include "nat/linux-nat.h" |
125f8a3d | 23 | #include "nat/gdb_thread_db.h" |
a5362b9a | 24 | #include <signal.h> |
dae5f5cf | 25 | |
623b6bdf | 26 | #include "gdbthread.h" |
95954743 PA |
27 | #include "gdb_proc_service.h" |
28 | ||
96d7229d | 29 | /* Included for ptrace type definitions. */ |
125f8a3d | 30 | #include "nat/linux-ptrace.h" |
15c66dd6 | 31 | #include "target/waitstatus.h" /* For enum target_stop_reason. */ |
229d26fc | 32 | #include "tracepoint.h" |
96d7229d | 33 | |
f15f9948 TJB |
34 | #define PTRACE_XFER_TYPE long |
35 | ||
58caa3dc | 36 | #ifdef HAVE_LINUX_REGSETS |
442ea881 PA |
37 | typedef void (*regset_fill_func) (struct regcache *, void *); |
38 | typedef void (*regset_store_func) (struct regcache *, const void *); | |
0d62e5e8 DJ |
39 | enum regset_type { |
40 | GENERAL_REGS, | |
41 | FP_REGS, | |
42 | EXTENDED_REGS, | |
1ef53e6b | 43 | OPTIONAL_REGS, /* Do not error if the regset cannot be accessed. */ |
0d62e5e8 DJ |
44 | }; |
45 | ||
50bc912a PA |
46 | /* The arch's regsets array initializer must be terminated with a NULL |
47 | regset. */ | |
48 | #define NULL_REGSET \ | |
49 | { 0, 0, 0, -1, (enum regset_type) -1, NULL, NULL } | |
50 | ||
58caa3dc DJ |
51 | struct regset_info |
52 | { | |
53 | int get_request, set_request; | |
1570b33e L |
54 | /* If NT_TYPE isn't 0, it will be passed to ptrace as the 3rd |
55 | argument and the 4th argument should be "const struct iovec *". */ | |
56 | int nt_type; | |
58caa3dc | 57 | int size; |
0d62e5e8 DJ |
58 | enum regset_type type; |
59 | regset_fill_func fill_function; | |
60 | regset_store_func store_function; | |
58caa3dc | 61 | }; |
3aee8918 PA |
62 | |
63 | /* Aggregation of all the supported regsets of a given | |
64 | architecture/mode. */ | |
65 | ||
66 | struct regsets_info | |
67 | { | |
68 | /* The regsets array. */ | |
69 | struct regset_info *regsets; | |
70 | ||
71 | /* The number of regsets in the REGSETS array. */ | |
72 | int num_regsets; | |
73 | ||
74 | /* If we get EIO on a regset, do not try it again. Note the set of | |
75 | supported regsets may depend on processor mode on biarch | |
030031ee PA |
76 | machines. This is a (lazily allocated) array holding one boolean |
77 | byte (0/1) per regset, with each element corresponding to the | |
78 | regset in the REGSETS array above at the same offset. */ | |
3aee8918 PA |
79 | char *disabled_regsets; |
80 | }; | |
81 | ||
82 | #endif | |
83 | ||
84 | /* Mapping between the general-purpose registers in `struct user' | |
85 | format and GDB's register array layout. */ | |
86 | ||
87 | struct usrregs_info | |
88 | { | |
89 | /* The number of registers accessible. */ | |
90 | int num_regs; | |
91 | ||
92 | /* The registers map. */ | |
93 | int *regmap; | |
94 | }; | |
95 | ||
96 | /* All info needed to access an architecture/mode's registers. */ | |
97 | ||
98 | struct regs_info | |
99 | { | |
100 | /* Regset support bitmap: 1 for registers that are transferred as a part | |
101 | of a regset, 0 for ones that need to be handled individually. This | |
102 | can be NULL if all registers are transferred with regsets or regsets | |
103 | are not supported. */ | |
104 | unsigned char *regset_bitmap; | |
105 | ||
106 | /* Info used when accessing registers with PTRACE_PEEKUSER / | |
107 | PTRACE_POKEUSER. This can be NULL if all registers are | |
108 | transferred with regsets .*/ | |
109 | struct usrregs_info *usrregs; | |
110 | ||
111 | #ifdef HAVE_LINUX_REGSETS | |
112 | /* Info used when accessing registers with regsets. */ | |
113 | struct regsets_info *regsets_info; | |
58caa3dc | 114 | #endif |
3aee8918 | 115 | }; |
2ec06d2e | 116 | |
95954743 PA |
117 | struct process_info_private |
118 | { | |
aa5ca48f DE |
119 | /* Arch-specific additions. */ |
120 | struct arch_process_info *arch_private; | |
cdbfd419 PP |
121 | |
122 | /* libthread_db-specific additions. Not NULL if this process has loaded | |
123 | thread_db, and it is active. */ | |
124 | struct thread_db *thread_db; | |
2268b414 JK |
125 | |
126 | /* &_r_debug. 0 if not yet determined. -1 if no PT_DYNAMIC in Phdrs. */ | |
127 | CORE_ADDR r_debug; | |
95954743 PA |
128 | }; |
129 | ||
aa5ca48f DE |
130 | struct lwp_info; |
131 | ||
2ec06d2e DJ |
132 | struct linux_target_ops |
133 | { | |
ee1a7ae4 UW |
134 | /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular |
135 | for registers smaller than an xfer unit). */ | |
442ea881 PA |
136 | void (*collect_ptrace_register) (struct regcache *regcache, |
137 | int regno, char *buf); | |
138 | void (*supply_ptrace_register) (struct regcache *regcache, | |
139 | int regno, const char *buf); | |
d0722149 DE |
140 | |
141 | /* Hook to convert from target format to ptrace format and back. | |
142 | Returns true if any conversion was done; false otherwise. | |
143 | If DIRECTION is 1, then copy from INF to NATIVE. | |
144 | If DIRECTION is 0, copy from NATIVE to INF. */ | |
8adce034 | 145 | int (*siginfo_fixup) (siginfo_t *native, gdb_byte *inf, int direction); |
aa5ca48f DE |
146 | |
147 | /* Hook to call when a new process is created or attached to. | |
148 | If extra per-process architecture-specific data is needed, | |
149 | allocate it here. */ | |
150 | struct arch_process_info * (*new_process) (void); | |
151 | ||
04ec7890 SM |
152 | /* Hook to call when a process is being deleted. If extra per-process |
153 | architecture-specific data is needed, delete it here. */ | |
154 | void (*delete_process) (struct arch_process_info *info); | |
155 | ||
aa5ca48f DE |
156 | /* Hook to call when a new thread is detected. |
157 | If extra per-thread architecture-specific data is needed, | |
158 | allocate it here. */ | |
34c703da | 159 | void (*new_thread) (struct lwp_info *); |
aa5ca48f | 160 | |
466eecee SM |
161 | /* Hook to call when a thread is being deleted. If extra per-thread |
162 | architecture-specific data is needed, delete it here. */ | |
163 | void (*delete_thread) (struct arch_lwp_info *); | |
164 | ||
3a8a0396 DB |
165 | /* Hook to call, if any, when a new fork is attached. */ |
166 | void (*new_fork) (struct process_info *parent, struct process_info *child); | |
167 | ||
aa5ca48f DE |
168 | /* Hook to call prior to resuming a thread. */ |
169 | void (*prepare_to_resume) (struct lwp_info *); | |
1570b33e L |
170 | |
171 | /* Hook to support target specific qSupported. */ | |
06e03fff | 172 | void (*process_qsupported) (char **, int count); |
219f2f23 PA |
173 | |
174 | /* Returns true if the low target supports tracepoints. */ | |
175 | int (*supports_tracepoints) (void); | |
fa593d66 PA |
176 | |
177 | /* Fill ADDRP with the thread area address of LWPID. Returns 0 on | |
178 | success, -1 on failure. */ | |
179 | int (*get_thread_area) (int lwpid, CORE_ADDR *addrp); | |
180 | ||
181 | /* Install a fast tracepoint jump pad. See target.h for | |
182 | comments. */ | |
183 | int (*install_fast_tracepoint_jump_pad) (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
184 | CORE_ADDR collector, | |
185 | CORE_ADDR lockaddr, | |
186 | ULONGEST orig_size, | |
187 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
188 | CORE_ADDR *trampoline, |
189 | ULONGEST *trampoline_size, | |
fa593d66 PA |
190 | unsigned char *jjump_pad_insn, |
191 | ULONGEST *jjump_pad_insn_size, | |
192 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
193 | CORE_ADDR *adjusted_insn_addr_end, |
194 | char *err); | |
6a271cae PA |
195 | |
196 | /* Return the bytecode operations vector for the current inferior. | |
197 | Returns NULL if bytecode compilation is not supported. */ | |
198 | struct emit_ops *(*emit_ops) (void); | |
405f8e94 SS |
199 | |
200 | /* Return the minimum length of an instruction that can be safely overwritten | |
201 | for use as a fast tracepoint. */ | |
202 | int (*get_min_fast_tracepoint_insn_len) (void); | |
203 | ||
c2d6af84 PA |
204 | /* Returns true if the low target supports range stepping. */ |
205 | int (*supports_range_stepping) (void); | |
769ef81f | 206 | |
7d00775e AT |
207 | /* See target.h. */ |
208 | int (*supports_hardware_single_step) (void); | |
82075af2 | 209 | |
4cc32bec YQ |
210 | /* Fill *SYSNO with the syscall nr trapped. Only to be called when |
211 | inferior is stopped due to SYSCALL_SIGTRAP. */ | |
212 | void (*get_syscall_trapinfo) (struct regcache *regcache, int *sysno); | |
ae91f625 MK |
213 | |
214 | /* See target.h. */ | |
215 | int (*get_ipa_tdesc_idx) (void); | |
2ec06d2e DJ |
216 | }; |
217 | ||
218 | extern struct linux_target_ops the_low_target; | |
0d62e5e8 | 219 | |
5ef9273d TBA |
220 | /* Target ops definitions for a Linux target. */ |
221 | ||
52405d85 | 222 | class linux_process_target : public process_stratum_target |
5ef9273d TBA |
223 | { |
224 | public: | |
225 | ||
15295543 TBA |
226 | int create_inferior (const char *program, |
227 | const std::vector<char *> &program_args) override; | |
6dee9afb TBA |
228 | |
229 | void post_create_inferior () override; | |
ef03dad8 TBA |
230 | |
231 | int attach (unsigned long pid) override; | |
c6885a57 TBA |
232 | |
233 | int kill (process_info *proc) override; | |
9061c9cf TBA |
234 | |
235 | int detach (process_info *proc) override; | |
8adb37b9 TBA |
236 | |
237 | void mourn (process_info *proc) override; | |
95a49a39 TBA |
238 | |
239 | void join (int pid) override; | |
13d3d99b TBA |
240 | |
241 | bool thread_alive (ptid_t pid) override; | |
0e4d7e35 TBA |
242 | |
243 | void resume (thread_resume *resume_info, size_t n) override; | |
6532e7e3 TBA |
244 | |
245 | ptid_t wait (ptid_t ptid, target_waitstatus *status, | |
246 | int options) override; | |
a5a4d4cd TBA |
247 | |
248 | void fetch_registers (regcache *regcache, int regno) override; | |
249 | ||
250 | void store_registers (regcache *regcache, int regno) override; | |
79b44087 TBA |
251 | |
252 | int prepare_to_access_memory () override; | |
253 | ||
254 | void done_accessing_memory () override; | |
e2558df3 TBA |
255 | |
256 | int read_memory (CORE_ADDR memaddr, unsigned char *myaddr, | |
257 | int len) override; | |
258 | ||
259 | int write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, | |
260 | int len) override; | |
2a31c7aa TBA |
261 | |
262 | void look_up_symbols () override; | |
eb497a2a TBA |
263 | |
264 | void request_interrupt () override; | |
eac215cc TBA |
265 | |
266 | bool supports_read_auxv () override; | |
267 | ||
268 | int read_auxv (CORE_ADDR offset, unsigned char *myaddr, | |
269 | unsigned int len) override; | |
a2b2297a | 270 | |
7e0bde70 TBA |
271 | int insert_point (enum raw_bkpt_type type, CORE_ADDR addr, |
272 | int size, raw_breakpoint *bp) override; | |
273 | ||
274 | int remove_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
275 | int size, raw_breakpoint *bp) override; | |
84320c4e TBA |
276 | |
277 | bool stopped_by_sw_breakpoint () override; | |
278 | ||
279 | bool supports_stopped_by_sw_breakpoint () override; | |
93fe88b2 TBA |
280 | |
281 | bool stopped_by_hw_breakpoint () override; | |
282 | ||
283 | bool supports_stopped_by_hw_breakpoint () override; | |
22aa6223 TBA |
284 | |
285 | bool supports_hardware_single_step () override; | |
6eeb5c55 TBA |
286 | |
287 | bool stopped_by_watchpoint () override; | |
288 | ||
289 | CORE_ADDR stopped_data_address () override; | |
5203ae1e TBA |
290 | |
291 | bool supports_read_offsets () override; | |
292 | ||
293 | int read_offsets (CORE_ADDR *text, CORE_ADDR *data) override; | |
6e3fd7e9 TBA |
294 | |
295 | bool supports_get_tls_address () override; | |
296 | ||
297 | int get_tls_address (thread_info *thread, CORE_ADDR offset, | |
298 | CORE_ADDR load_module, CORE_ADDR *address) override; | |
2d0795ee TBA |
299 | |
300 | bool supports_qxfer_osdata () override; | |
301 | ||
302 | int qxfer_osdata (const char *annex, unsigned char *readbuf, | |
303 | unsigned const char *writebuf, | |
304 | CORE_ADDR offset, int len) override; | |
d7abedf7 TBA |
305 | |
306 | bool supports_qxfer_siginfo () override; | |
307 | ||
308 | int qxfer_siginfo (const char *annex, unsigned char *readbuf, | |
309 | unsigned const char *writebuf, | |
310 | CORE_ADDR offset, int len) override; | |
0dc587d4 TBA |
311 | |
312 | bool supports_non_stop () override; | |
313 | ||
314 | bool async (bool enable) override; | |
315 | ||
316 | int start_non_stop (bool enable) override; | |
652aef77 TBA |
317 | |
318 | bool supports_multi_process () override; | |
9690a72a TBA |
319 | |
320 | bool supports_fork_events () override; | |
321 | ||
322 | bool supports_vfork_events () override; | |
323 | ||
324 | bool supports_exec_events () override; | |
fb00dfce TBA |
325 | |
326 | void handle_new_gdb_connection () override; | |
55cf3021 TBA |
327 | |
328 | int handle_monitor_command (char *mon) override; | |
95a45fc1 TBA |
329 | |
330 | int core_of_thread (ptid_t ptid) override; | |
9da41fda TBA |
331 | |
332 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC | |
333 | bool supports_read_loadmap () override; | |
334 | ||
335 | int read_loadmap (const char *annex, CORE_ADDR offset, | |
336 | unsigned char *myaddr, unsigned int len) override; | |
337 | #endif | |
0df28b1b TBA |
338 | |
339 | void process_qsupported (char **features, int count) override; | |
290732bf TBA |
340 | |
341 | bool supports_tracepoints () override; | |
770d8f6a TBA |
342 | |
343 | CORE_ADDR read_pc (regcache *regcache) override; | |
344 | ||
345 | void write_pc (regcache *regcache, CORE_ADDR pc) override; | |
68119632 TBA |
346 | |
347 | bool supports_thread_stopped () override; | |
348 | ||
349 | bool thread_stopped (thread_info *thread) override; | |
29e8dc09 TBA |
350 | |
351 | void pause_all (bool freeze) override; | |
352 | ||
353 | void unpause_all (bool unfreeze) override; | |
5c9eb2f2 TBA |
354 | |
355 | void stabilize_threads () override; | |
c23c9391 TBA |
356 | |
357 | bool supports_fast_tracepoints () override; | |
358 | ||
359 | int install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, | |
360 | CORE_ADDR tpaddr, | |
361 | CORE_ADDR collector, | |
362 | CORE_ADDR lockaddr, | |
363 | ULONGEST orig_size, | |
364 | CORE_ADDR *jump_entry, | |
365 | CORE_ADDR *trampoline, | |
366 | ULONGEST *trampoline_size, | |
367 | unsigned char *jjump_pad_insn, | |
368 | ULONGEST *jjump_pad_insn_size, | |
369 | CORE_ADDR *adjusted_insn_addr, | |
370 | CORE_ADDR *adjusted_insn_addr_end, | |
371 | char *err) override; | |
372 | ||
373 | int get_min_fast_tracepoint_insn_len () override; | |
345dafad TBA |
374 | |
375 | struct emit_ops *emit_ops () override; | |
c756403b TBA |
376 | |
377 | bool supports_disable_randomization () override; | |
974387bb TBA |
378 | |
379 | bool supports_qxfer_libraries_svr4 () override; | |
380 | ||
381 | int qxfer_libraries_svr4 (const char *annex, | |
382 | unsigned char *readbuf, | |
383 | unsigned const char *writebuf, | |
384 | CORE_ADDR offset, int len) override; | |
c0245cb9 TBA |
385 | |
386 | bool supports_agent () override; | |
79597bdd TBA |
387 | |
388 | #ifdef HAVE_LINUX_BTRACE | |
389 | btrace_target_info *enable_btrace (ptid_t ptid, | |
390 | const btrace_config *conf) override; | |
391 | ||
392 | int disable_btrace (btrace_target_info *tinfo) override; | |
393 | ||
394 | int read_btrace (btrace_target_info *tinfo, buffer *buf, | |
395 | enum btrace_read_type type) override; | |
396 | ||
397 | int read_btrace_conf (const btrace_target_info *tinfo, | |
398 | buffer *buf) override; | |
399 | #endif | |
2526e0cd TBA |
400 | |
401 | bool supports_range_stepping () override; | |
8247b823 TBA |
402 | |
403 | bool supports_pid_to_exec_file () override; | |
404 | ||
405 | char *pid_to_exec_file (int pid) override; | |
c9b7b804 TBA |
406 | |
407 | bool supports_multifs () override; | |
408 | ||
409 | int multifs_open (int pid, const char *filename, int flags, | |
410 | mode_t mode) override; | |
411 | ||
412 | int multifs_unlink (int pid, const char *filename) override; | |
413 | ||
414 | ssize_t multifs_readlink (int pid, const char *filename, char *buf, | |
415 | size_t bufsiz) override; | |
d367006f | 416 | |
7f63b89b TBA |
417 | const char *thread_name (ptid_t thread) override; |
418 | ||
419 | #if USE_THREAD_DB | |
420 | bool thread_handle (ptid_t ptid, gdb_byte **handle, | |
421 | int *handle_len) override; | |
422 | #endif | |
5303a34f | 423 | |
bc8d3ae4 | 424 | bool supports_catch_syscall () override; |
d633e831 TBA |
425 | |
426 | int get_ipa_tdesc_idx () override; | |
d16f3f6c | 427 | |
aa8d21c9 TBA |
428 | /* Return the information to access registers. This has public |
429 | visibility because proc-service uses it. */ | |
430 | virtual const regs_info *get_regs_info () = 0; | |
431 | ||
d16f3f6c TBA |
432 | private: |
433 | ||
434 | /* Handle a GNU/Linux extended wait response. If we see a clone, | |
435 | fork, or vfork event, we need to add the new LWP to our list | |
436 | (and return 0 so as not to report the trap to higher layers). | |
437 | If we see an exec event, we will modify ORIG_EVENT_LWP to point | |
438 | to a new LWP representing the new program. */ | |
439 | int handle_extended_wait (lwp_info **orig_event_lwp, int wstat); | |
440 | ||
441 | /* Do low-level handling of the event, and check if we should go on | |
442 | and pass it to caller code. Return the affected lwp if we are, or | |
443 | NULL otherwise. */ | |
444 | lwp_info *filter_event (int lwpid, int wstat); | |
445 | ||
446 | /* Wait for an event from child(ren) WAIT_PTID, and return any that | |
447 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
448 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
449 | lwps of a thread group; or a PTID representing a single lwp. Store | |
450 | the stop status through the status pointer WSTAT. OPTIONS is | |
451 | passed to the waitpid call. Return 0 if no event was found and | |
452 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
453 | was found. Return the PID of the stopped child otherwise. */ | |
454 | int wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, | |
455 | int *wstatp, int options); | |
456 | ||
457 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
458 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
459 | lwps of a thread group; or a PTID representing a single lwp. Store | |
460 | the stop status through the status pointer WSTAT. OPTIONS is | |
461 | passed to the waitpid call. Return 0 if no event was found and | |
462 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
463 | was found. Return the PID of the stopped child otherwise. */ | |
464 | int wait_for_event (ptid_t ptid, int *wstatp, int options); | |
465 | ||
466 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ | |
467 | void wait_for_sigstop (); | |
468 | ||
469 | /* Wait for process, returns status. */ | |
470 | ptid_t wait_1 (ptid_t ptid, target_waitstatus *ourstatus, | |
471 | int target_options); | |
472 | ||
473 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. | |
474 | If SUSPEND, then also increase the suspend count of every LWP, | |
475 | except EXCEPT. */ | |
476 | void stop_all_lwps (int suspend, lwp_info *except); | |
477 | ||
478 | /* Stopped LWPs that the client wanted to be running, that don't have | |
479 | pending statuses, are set to run again, except for EXCEPT, if not | |
480 | NULL. This undoes a stop_all_lwps call. */ | |
481 | void unstop_all_lwps (int unsuspend, lwp_info *except); | |
482 | ||
483 | /* Start a step-over operation on LWP. When LWP stopped at a | |
484 | breakpoint, to make progress, we need to remove the breakpoint out | |
485 | of the way. If we let other threads run while we do that, they may | |
486 | pass by the breakpoint location and miss hitting it. To avoid | |
487 | that, a step-over momentarily stops all threads while LWP is | |
488 | single-stepped by either hardware or software while the breakpoint | |
489 | is temporarily uninserted from the inferior. When the single-step | |
490 | finishes, we reinsert the breakpoint, and let all threads that are | |
491 | supposed to be running, run again. */ | |
492 | void start_step_over (lwp_info *lwp); | |
493 | ||
494 | /* If there's a step over in progress, wait until all threads stop | |
495 | (that is, until the stepping thread finishes its step), and | |
496 | unsuspend all lwps. The stepping thread ends with its status | |
497 | pending, which is processed later when we get back to processing | |
498 | events. */ | |
499 | void complete_ongoing_step_over (); | |
500 | ||
501 | /* When we finish a step-over, set threads running again. If there's | |
502 | another thread that may need a step-over, now's the time to start | |
503 | it. Eventually, we'll move all threads past their breakpoints. */ | |
504 | void proceed_all_lwps (); | |
505 | ||
506 | /* The reason we resume in the caller, is because we want to be able | |
507 | to pass lwp->status_pending as WSTAT, and we need to clear | |
508 | status_pending_p before resuming, otherwise, resume_one_lwp | |
509 | refuses to resume. */ | |
510 | bool maybe_move_out_of_jump_pad (lwp_info *lwp, int *wstat); | |
511 | ||
512 | /* Move THREAD out of the jump pad. */ | |
513 | void move_out_of_jump_pad (thread_info *thread); | |
ef0478f6 | 514 | |
797bcff5 TBA |
515 | /* Call low_arch_setup on THREAD. */ |
516 | void arch_setup_thread (thread_info *thread); | |
517 | ||
daca57a7 TBA |
518 | #ifdef HAVE_LINUX_USRREGS |
519 | /* Fetch one register. */ | |
520 | void fetch_register (const usrregs_info *usrregs, regcache *regcache, | |
521 | int regno); | |
522 | ||
523 | /* Store one register. */ | |
524 | void store_register (const usrregs_info *usrregs, regcache *regcache, | |
525 | int regno); | |
526 | #endif | |
527 | ||
528 | /* Fetch all registers, or just one, from the child process. | |
529 | If REGNO is -1, do this for all registers, skipping any that are | |
530 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
531 | unless ALL is non-zero. | |
532 | Otherwise, REGNO specifies which register (so we can save time). */ | |
533 | void usr_fetch_inferior_registers (const regs_info *regs_info, | |
534 | regcache *regcache, int regno, int all); | |
535 | ||
536 | /* Store our register values back into the inferior. | |
537 | If REGNO is -1, do this for all registers, skipping any that are | |
538 | assumed to have been saved by regsets_store_inferior_registers, | |
539 | unless ALL is non-zero. | |
540 | Otherwise, REGNO specifies which register (so we can save time). */ | |
541 | void usr_store_inferior_registers (const regs_info *regs_info, | |
542 | regcache *regcache, int regno, int all); | |
543 | ||
df95181f TBA |
544 | /* Return the PC as read from the regcache of LWP, without any |
545 | adjustment. */ | |
546 | CORE_ADDR get_pc (lwp_info *lwp); | |
547 | ||
548 | /* Called when the LWP stopped for a signal/trap. If it stopped for a | |
549 | trap check what caused it (breakpoint, watchpoint, trace, etc.), | |
550 | and save the result in the LWP's stop_reason field. If it stopped | |
551 | for a breakpoint, decrement the PC if necessary on the lwp's | |
552 | architecture. Returns true if we now have the LWP's stop PC. */ | |
553 | bool save_stop_reason (lwp_info *lwp); | |
554 | ||
555 | /* Resume execution of LWP. If STEP is nonzero, single-step it. If | |
556 | SIGNAL is nonzero, give it that signal. */ | |
557 | void resume_one_lwp_throw (lwp_info *lwp, int step, int signal, | |
558 | siginfo_t *info); | |
559 | ||
560 | /* Like resume_one_lwp_throw, but no error is thrown if the LWP | |
561 | disappears while we try to resume it. */ | |
562 | void resume_one_lwp (lwp_info *lwp, int step, int signal, siginfo_t *info); | |
563 | ||
564 | /* This function is called once per thread. We check the thread's | |
565 | last resume request, which will tell us whether to resume, step, or | |
566 | leave the thread stopped. Any signal the client requested to be | |
567 | delivered has already been enqueued at this point. | |
568 | ||
569 | If any thread that GDB wants running is stopped at an internal | |
570 | breakpoint that needs stepping over, we start a step-over operation | |
571 | on that particular thread, and leave all others stopped. */ | |
572 | void proceed_one_lwp (thread_info *thread, lwp_info *except); | |
573 | ||
574 | /* This function is called once per thread. We check the thread's | |
575 | resume request, which will tell us whether to resume, step, or | |
576 | leave the thread stopped; and what signal, if any, it should be | |
577 | sent. | |
578 | ||
579 | For threads which we aren't explicitly told otherwise, we preserve | |
580 | the stepping flag; this is used for stepping over gdbserver-placed | |
581 | breakpoints. | |
582 | ||
583 | If pending_flags was set in any thread, we queue any needed | |
584 | signals, since we won't actually resume. We already have a pending | |
585 | event to report, so we don't need to preserve any step requests; | |
586 | they should be re-issued if necessary. */ | |
587 | void resume_one_thread (thread_info *thread, bool leave_all_stopped); | |
588 | ||
589 | /* Return true if this lwp has an interesting status pending. */ | |
590 | bool status_pending_p_callback (thread_info *thread, ptid_t ptid); | |
591 | ||
592 | /* Resume LWPs that are currently stopped without any pending status | |
593 | to report, but are resumed from the core's perspective. */ | |
594 | void resume_stopped_resumed_lwps (thread_info *thread); | |
595 | ||
596 | /* Unsuspend THREAD, except EXCEPT, and proceed. */ | |
597 | void unsuspend_and_proceed_one_lwp (thread_info *thread, lwp_info *except); | |
598 | ||
599 | /* Return true if this lwp still has an interesting status pending. | |
600 | If not (e.g., it had stopped for a breakpoint that is gone), return | |
601 | false. */ | |
602 | bool thread_still_has_status_pending (thread_info *thread); | |
603 | ||
604 | /* Return true if this lwp is to-be-resumed and has an interesting | |
605 | status pending. */ | |
606 | bool resume_status_pending (thread_info *thread); | |
607 | ||
608 | /* Return true if this lwp that GDB wants running is stopped at an | |
609 | internal breakpoint that we need to step over. It assumes that | |
610 | any required STOP_PC adjustment has already been propagated to | |
611 | the inferior's regcache. */ | |
612 | bool thread_needs_step_over (thread_info *thread); | |
613 | ||
614 | /* Single step via hardware or software single step. | |
615 | Return 1 if hardware single stepping, 0 if software single stepping | |
616 | or can't single step. */ | |
617 | int single_step (lwp_info* lwp); | |
618 | ||
619 | /* Install breakpoints for software single stepping. */ | |
620 | void install_software_single_step_breakpoints (lwp_info *lwp); | |
621 | ||
ac1bbaca TBA |
622 | /* Fetch the possibly triggered data watchpoint info and store it in |
623 | CHILD. | |
624 | ||
625 | On some archs, like x86, that use debug registers to set | |
626 | watchpoints, it's possible that the way to know which watched | |
627 | address trapped, is to check the register that is used to select | |
628 | which address to watch. Problem is, between setting the watchpoint | |
629 | and reading back which data address trapped, the user may change | |
630 | the set of watchpoints, and, as a consequence, GDB changes the | |
631 | debug registers in the inferior. To avoid reading back a stale | |
632 | stopped-data-address when that happens, we cache in LP the fact | |
633 | that a watchpoint trapped, and the corresponding data address, as | |
634 | soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug | |
635 | registers meanwhile, we have the cached data we can rely on. */ | |
636 | bool check_stopped_by_watchpoint (lwp_info *child); | |
637 | ||
ef0478f6 TBA |
638 | protected: |
639 | /* The architecture-specific "low" methods are listed below. */ | |
797bcff5 TBA |
640 | |
641 | /* Architecture-specific setup for the current thread. */ | |
642 | virtual void low_arch_setup () = 0; | |
daca57a7 TBA |
643 | |
644 | /* Return false if we can fetch/store the register, true if we cannot | |
645 | fetch/store the register. */ | |
646 | virtual bool low_cannot_fetch_register (int regno) = 0; | |
647 | ||
648 | virtual bool low_cannot_store_register (int regno) = 0; | |
bd70b1f2 TBA |
649 | |
650 | /* Hook to fetch a register in some non-standard way. Used for | |
651 | example by backends that have read-only registers with hardcoded | |
652 | values (e.g., IA64's gr0/fr0/fr1). Returns true if register | |
653 | REGNO was supplied, false if not, and we should fallback to the | |
654 | standard ptrace methods. */ | |
655 | virtual bool low_fetch_register (regcache *regcache, int regno); | |
bf9ae9d8 TBA |
656 | |
657 | /* Return true if breakpoints are supported. Such targets must | |
658 | implement the GET_PC and SET_PC methods. */ | |
659 | virtual bool low_supports_breakpoints (); | |
660 | ||
661 | virtual CORE_ADDR low_get_pc (regcache *regcache); | |
662 | ||
663 | virtual void low_set_pc (regcache *regcache, CORE_ADDR newpc); | |
7582c77c TBA |
664 | |
665 | /* Find the next possible PCs after the current instruction executes. | |
666 | Targets that override this method should also override | |
667 | 'supports_software_single_step' to return true. */ | |
668 | virtual std::vector<CORE_ADDR> low_get_next_pcs (regcache *regcache); | |
d4807ea2 | 669 | |
d7146cda TBA |
670 | /* Return true if there is a breakpoint at PC. */ |
671 | virtual bool low_breakpoint_at (CORE_ADDR pc) = 0; | |
672 | ||
9db9aa23 TBA |
673 | /* Breakpoint and watchpoint related functions. See target.h for |
674 | comments. */ | |
675 | virtual int low_insert_point (raw_bkpt_type type, CORE_ADDR addr, | |
676 | int size, raw_breakpoint *bp); | |
677 | ||
678 | virtual int low_remove_point (raw_bkpt_type type, CORE_ADDR addr, | |
679 | int size, raw_breakpoint *bp); | |
680 | ||
ac1bbaca TBA |
681 | virtual bool low_stopped_by_watchpoint (); |
682 | ||
683 | virtual CORE_ADDR low_stopped_data_address (); | |
684 | ||
d4807ea2 TBA |
685 | /* How many bytes the PC should be decremented after a break. */ |
686 | virtual int low_decr_pc_after_break (); | |
5ef9273d TBA |
687 | }; |
688 | ||
ef0478f6 TBA |
689 | extern linux_process_target *the_linux_target; |
690 | ||
6afd337d | 691 | #define get_thread_lwp(thr) ((struct lwp_info *) (thread_target_data (thr))) |
f7667f0d | 692 | #define get_lwp_thread(lwp) ((lwp)->thread) |
0d62e5e8 | 693 | |
d86d4aaf DE |
694 | /* This struct is recorded in the target_data field of struct thread_info. |
695 | ||
696 | On linux ``all_threads'' is keyed by the LWP ID, which we use as the | |
697 | GDB protocol representation of the thread ID. Threads also have | |
698 | a "process ID" (poorly named) which is (presently) the same as the | |
699 | LWP ID. | |
700 | ||
701 | There is also ``all_processes'' is keyed by the "overall process ID", | |
702 | which GNU/Linux calls tgid, "thread group ID". */ | |
703 | ||
54a0b537 | 704 | struct lwp_info |
0d62e5e8 | 705 | { |
d86d4aaf | 706 | /* Backlink to the parent object. */ |
f7667f0d DE |
707 | struct thread_info *thread; |
708 | ||
ae13219e DJ |
709 | /* If this flag is set, the next SIGSTOP will be ignored (the |
710 | process will be immediately resumed). This means that either we | |
711 | sent the SIGSTOP to it ourselves and got some other pending event | |
712 | (so the SIGSTOP is still pending), or that we stopped the | |
713 | inferior implicitly via PTRACE_ATTACH and have not waited for it | |
714 | yet. */ | |
0d62e5e8 DJ |
715 | int stop_expected; |
716 | ||
d50171e4 PA |
717 | /* When this is true, we shall not try to resume this thread, even |
718 | if last_resume_kind isn't resume_stop. */ | |
bd99dc85 PA |
719 | int suspended; |
720 | ||
721 | /* If this flag is set, the lwp is known to be stopped right now (stop | |
0d62e5e8 DJ |
722 | event already received in a wait()). */ |
723 | int stopped; | |
724 | ||
82075af2 JS |
725 | /* Signal whether we are in a SYSCALL_ENTRY or |
726 | in a SYSCALL_RETURN event. | |
727 | Values: | |
728 | - TARGET_WAITKIND_SYSCALL_ENTRY | |
729 | - TARGET_WAITKIND_SYSCALL_RETURN */ | |
730 | enum target_waitkind syscall_state; | |
731 | ||
bd99dc85 | 732 | /* When stopped is set, the last wait status recorded for this lwp. */ |
32ca6d61 DJ |
733 | int last_status; |
734 | ||
00db26fa PA |
735 | /* If WAITSTATUS->KIND != TARGET_WAITKIND_IGNORE, the waitstatus for |
736 | this LWP's last event, to pass to GDB without any further | |
737 | processing. This is used to store extended ptrace event | |
738 | information or exit status until it can be reported to GDB. */ | |
de0d863e DB |
739 | struct target_waitstatus waitstatus; |
740 | ||
5a04c4cf PA |
741 | /* A pointer to the fork child/parent relative. Valid only while |
742 | the parent fork event is not reported to higher layers. Used to | |
743 | avoid wildcard vCont actions resuming a fork child before GDB is | |
744 | notified about the parent's fork event. */ | |
745 | struct lwp_info *fork_relative; | |
746 | ||
582511be PA |
747 | /* When stopped is set, this is where the lwp last stopped, with |
748 | decr_pc_after_break already accounted for. If the LWP is | |
749 | running, this is the address at which the lwp was resumed. */ | |
d50171e4 PA |
750 | CORE_ADDR stop_pc; |
751 | ||
0d62e5e8 DJ |
752 | /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet |
753 | been reported. */ | |
754 | int status_pending_p; | |
755 | int status_pending; | |
756 | ||
582511be PA |
757 | /* The reason the LWP last stopped, if we need to track it |
758 | (breakpoint, watchpoint, etc.) */ | |
15c66dd6 | 759 | enum target_stop_reason stop_reason; |
c3adc08c PA |
760 | |
761 | /* On architectures where it is possible to know the data address of | |
762 | a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and | |
763 | contains such data address. Only valid if STOPPED_BY_WATCHPOINT | |
764 | is true. */ | |
765 | CORE_ADDR stopped_data_address; | |
766 | ||
0d62e5e8 DJ |
767 | /* If this is non-zero, it is a breakpoint to be reinserted at our next |
768 | stop (SIGTRAP stops only). */ | |
769 | CORE_ADDR bp_reinsert; | |
770 | ||
d50171e4 PA |
771 | /* If this flag is set, the last continue operation at the ptrace |
772 | level on this process was a single-step. */ | |
0d62e5e8 DJ |
773 | int stepping; |
774 | ||
c2d6af84 PA |
775 | /* Range to single step within. This is a copy of the step range |
776 | passed along the last resume request. See 'struct | |
777 | thread_resume'. */ | |
778 | CORE_ADDR step_range_start; /* Inclusive */ | |
779 | CORE_ADDR step_range_end; /* Exclusive */ | |
780 | ||
a6dbe5df PA |
781 | /* If this flag is set, we need to set the event request flags the |
782 | next time we see this LWP stop. */ | |
783 | int must_set_ptrace_flags; | |
784 | ||
0d62e5e8 DJ |
785 | /* If this is non-zero, it points to a chain of signals which need to |
786 | be delivered to this process. */ | |
787 | struct pending_signals *pending_signals; | |
5544ad89 DJ |
788 | |
789 | /* A link used when resuming. It is initialized from the resume request, | |
54a0b537 | 790 | and then processed and cleared in linux_resume_one_lwp. */ |
5544ad89 | 791 | struct thread_resume *resume; |
dae5f5cf | 792 | |
229d26fc SM |
793 | /* Information bout this lwp's fast tracepoint collection status (is it |
794 | currently stopped in the jump pad, and if so, before or at/after the | |
795 | relocated instruction). Normally, we won't care about this, but we will | |
796 | if a signal arrives to this lwp while it is collecting. */ | |
797 | fast_tpoint_collect_result collecting_fast_tracepoint; | |
fa593d66 PA |
798 | |
799 | /* If this is non-zero, it points to a chain of signals which need | |
800 | to be reported to GDB. These were deferred because the thread | |
801 | was doing a fast tracepoint collect when they arrived. */ | |
802 | struct pending_signals *pending_signals_to_report; | |
803 | ||
804 | /* When collecting_fast_tracepoint is first found to be 1, we insert | |
805 | a exit-jump-pad-quickly breakpoint. This is it. */ | |
806 | struct breakpoint *exit_jump_pad_bkpt; | |
807 | ||
04f5fe89 | 808 | #ifdef USE_THREAD_DB |
d5c93e41 | 809 | int thread_known; |
24a09b5f DJ |
810 | /* The thread handle, used for e.g. TLS access. Only valid if |
811 | THREAD_KNOWN is set. */ | |
dae5f5cf | 812 | td_thrhandle_t th; |
f6327dcb KB |
813 | |
814 | /* The pthread_t handle. */ | |
815 | thread_t thread_handle; | |
dae5f5cf | 816 | #endif |
aa5ca48f DE |
817 | |
818 | /* Arch-specific additions. */ | |
819 | struct arch_lwp_info *arch_private; | |
0d62e5e8 | 820 | }; |
5544ad89 | 821 | |
214d508e | 822 | int linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine); |
d0722149 | 823 | |
7ae1a6a6 PA |
824 | /* Attach to PTID. Returns 0 on success, non-zero otherwise (an |
825 | errno). */ | |
826 | int linux_attach_lwp (ptid_t ptid); | |
827 | ||
cdbfd419 | 828 | struct lwp_info *find_lwp_pid (ptid_t ptid); |
b2f7c7e8 | 829 | /* For linux_stop_lwp see nat/linux-nat.h. */ |
0d62e5e8 | 830 | |
3aee8918 PA |
831 | #ifdef HAVE_LINUX_REGSETS |
832 | void initialize_regsets_info (struct regsets_info *regsets_info); | |
833 | #endif | |
834 | ||
835 | void initialize_low_arch (void); | |
836 | ||
276d4552 YQ |
837 | void linux_set_pc_32bit (struct regcache *regcache, CORE_ADDR pc); |
838 | CORE_ADDR linux_get_pc_32bit (struct regcache *regcache); | |
839 | ||
6f69e520 YQ |
840 | void linux_set_pc_64bit (struct regcache *regcache, CORE_ADDR pc); |
841 | CORE_ADDR linux_get_pc_64bit (struct regcache *regcache); | |
842 | ||
cdbfd419 | 843 | /* From thread-db.c */ |
9b4c5f87 | 844 | int thread_db_init (void); |
8336d594 PA |
845 | void thread_db_detach (struct process_info *); |
846 | void thread_db_mourn (struct process_info *); | |
cdbfd419 | 847 | int thread_db_handle_monitor_command (char *); |
dae5f5cf DJ |
848 | int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset, |
849 | CORE_ADDR load_module, CORE_ADDR *address); | |
9836d6ea | 850 | int thread_db_look_up_one_symbol (const char *name, CORE_ADDR *addrp); |
ded48a5e | 851 | |
86299109 KB |
852 | /* Called from linux-low.c when a clone event is detected. Upon entry, |
853 | both the clone and the parent should be stopped. This function does | |
854 | whatever is required have the clone under thread_db's control. */ | |
855 | ||
94c207e0 | 856 | void thread_db_notice_clone (struct thread_info *parent_thr, ptid_t child_ptid); |
86299109 | 857 | |
f6327dcb KB |
858 | bool thread_db_thread_handle (ptid_t ptid, gdb_byte **handle, int *handle_len); |
859 | ||
ded48a5e | 860 | extern int have_ptrace_getregset; |
1a5c2598 | 861 | |
0570503d PFC |
862 | /* Search for the value with type MATCH in the auxv vector with |
863 | entries of length WORDSIZE bytes. If found, store the value in | |
864 | *VALP and return 1. If not found or if there is an error, return | |
865 | 0. */ | |
866 | ||
867 | int linux_get_auxv (int wordsize, CORE_ADDR match, | |
868 | CORE_ADDR *valp); | |
869 | ||
974c89e0 AH |
870 | /* Fetch the AT_HWCAP entry from the auxv vector, where entries are length |
871 | WORDSIZE. If no entry was found, return zero. */ | |
872 | ||
873 | CORE_ADDR linux_get_hwcap (int wordsize); | |
874 | ||
875 | /* Fetch the AT_HWCAP2 entry from the auxv vector, where entries are length | |
876 | WORDSIZE. If no entry was found, return zero. */ | |
877 | ||
878 | CORE_ADDR linux_get_hwcap2 (int wordsize); | |
879 | ||
1a5c2598 | 880 | #endif /* GDBSERVER_LINUX_LOW_H */ |