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1 | /* Machine independent support for Solaris /proc (process file system) for GDB. | |
2 | ||
3 | Copyright (C) 1999-2021 Free Software Foundation, Inc. | |
4 | ||
5 | Written by Michael Snyder at Cygnus Solutions. | |
6 | Based on work by Fred Fish, Stu Grossman, Geoff Noer, and others. | |
7 | ||
8 | This file is part of GDB. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 3 of the License, or | |
13 | (at your option) any later version. | |
14 | ||
15 | This program is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
22 | ||
23 | #include "defs.h" | |
24 | #include "inferior.h" | |
25 | #include "infrun.h" | |
26 | #include "target.h" | |
27 | #include "gdbcore.h" | |
28 | #include "elf-bfd.h" /* for elfcore_write_* */ | |
29 | #include "gdbcmd.h" | |
30 | #include "gdbthread.h" | |
31 | #include "regcache.h" | |
32 | #include "inf-child.h" | |
33 | #include "nat/fork-inferior.h" | |
34 | #include "gdbarch.h" | |
35 | ||
36 | #include <sys/procfs.h> | |
37 | #include <sys/fault.h> | |
38 | #include <sys/syscall.h> | |
39 | #include "gdbsupport/gdb_wait.h" | |
40 | #include <signal.h> | |
41 | #include <ctype.h> | |
42 | #include "gdb_bfd.h" | |
43 | #include "inflow.h" | |
44 | #include "auxv.h" | |
45 | #include "procfs.h" | |
46 | #include "observable.h" | |
47 | #include "gdbsupport/scoped_fd.h" | |
48 | #include "gdbsupport/pathstuff.h" | |
49 | ||
50 | /* This module provides the interface between GDB and the | |
51 | /proc file system, which is used on many versions of Unix | |
52 | as a means for debuggers to control other processes. | |
53 | ||
54 | /proc works by imitating a file system: you open a simulated file | |
55 | that represents the process you wish to interact with, and perform | |
56 | operations on that "file" in order to examine or change the state | |
57 | of the other process. | |
58 | ||
59 | The most important thing to know about /proc and this module is | |
60 | that there are two very different interfaces to /proc: | |
61 | ||
62 | One that uses the ioctl system call, and another that uses read | |
63 | and write system calls. | |
64 | ||
65 | This module supports only the Solaris version of the read/write | |
66 | interface. */ | |
67 | ||
68 | #include <sys/types.h> | |
69 | #include <dirent.h> /* opendir/readdir, for listing the LWP's */ | |
70 | ||
71 | #include <fcntl.h> /* for O_RDONLY */ | |
72 | #include <unistd.h> /* for "X_OK" */ | |
73 | #include <sys/stat.h> /* for struct stat */ | |
74 | ||
75 | /* Note: procfs-utils.h must be included after the above system header | |
76 | files, because it redefines various system calls using macros. | |
77 | This may be incompatible with the prototype declarations. */ | |
78 | ||
79 | #include "proc-utils.h" | |
80 | ||
81 | /* Prototypes for supply_gregset etc. */ | |
82 | #include "gregset.h" | |
83 | ||
84 | /* =================== TARGET_OPS "MODULE" =================== */ | |
85 | ||
86 | /* This module defines the GDB target vector and its methods. */ | |
87 | ||
88 | ||
89 | static enum target_xfer_status procfs_xfer_memory (gdb_byte *, | |
90 | const gdb_byte *, | |
91 | ULONGEST, ULONGEST, | |
92 | ULONGEST *); | |
93 | ||
94 | class procfs_target final : public inf_child_target | |
95 | { | |
96 | public: | |
97 | void create_inferior (const char *, const std::string &, | |
98 | char **, int) override; | |
99 | ||
100 | void kill () override; | |
101 | ||
102 | void mourn_inferior () override; | |
103 | ||
104 | void attach (const char *, int) override; | |
105 | void detach (inferior *inf, int) override; | |
106 | ||
107 | void resume (ptid_t, int, enum gdb_signal) override; | |
108 | ptid_t wait (ptid_t, struct target_waitstatus *, target_wait_flags) override; | |
109 | ||
110 | void fetch_registers (struct regcache *, int) override; | |
111 | void store_registers (struct regcache *, int) override; | |
112 | ||
113 | enum target_xfer_status xfer_partial (enum target_object object, | |
114 | const char *annex, | |
115 | gdb_byte *readbuf, | |
116 | const gdb_byte *writebuf, | |
117 | ULONGEST offset, ULONGEST len, | |
118 | ULONGEST *xfered_len) override; | |
119 | ||
120 | void pass_signals (gdb::array_view<const unsigned char>) override; | |
121 | ||
122 | void files_info () override; | |
123 | ||
124 | void update_thread_list () override; | |
125 | ||
126 | bool thread_alive (ptid_t ptid) override; | |
127 | ||
128 | std::string pid_to_str (ptid_t) override; | |
129 | ||
130 | char *pid_to_exec_file (int pid) override; | |
131 | ||
132 | thread_control_capabilities get_thread_control_capabilities () override | |
133 | { return tc_schedlock; } | |
134 | ||
135 | /* find_memory_regions support method for gcore */ | |
136 | int find_memory_regions (find_memory_region_ftype func, void *data) | |
137 | override; | |
138 | ||
139 | gdb::unique_xmalloc_ptr<char> make_corefile_notes (bfd *, int *) override; | |
140 | ||
141 | bool info_proc (const char *, enum info_proc_what) override; | |
142 | ||
143 | #if PR_MODEL_NATIVE == PR_MODEL_LP64 | |
144 | int auxv_parse (gdb_byte **readptr, | |
145 | gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) | |
146 | override; | |
147 | #endif | |
148 | ||
149 | bool stopped_by_watchpoint () override; | |
150 | ||
151 | int insert_watchpoint (CORE_ADDR, int, enum target_hw_bp_type, | |
152 | struct expression *) override; | |
153 | ||
154 | int remove_watchpoint (CORE_ADDR, int, enum target_hw_bp_type, | |
155 | struct expression *) override; | |
156 | ||
157 | int region_ok_for_hw_watchpoint (CORE_ADDR, int) override; | |
158 | ||
159 | int can_use_hw_breakpoint (enum bptype, int, int) override; | |
160 | bool stopped_data_address (CORE_ADDR *) override; | |
161 | ||
162 | void procfs_init_inferior (int pid); | |
163 | }; | |
164 | ||
165 | static procfs_target the_procfs_target; | |
166 | ||
167 | #if PR_MODEL_NATIVE == PR_MODEL_LP64 | |
168 | /* When GDB is built as 64-bit application on Solaris, the auxv data | |
169 | is presented in 64-bit format. We need to provide a custom parser | |
170 | to handle that. */ | |
171 | int | |
172 | procfs_target::auxv_parse (gdb_byte **readptr, | |
173 | gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) | |
174 | { | |
175 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); | |
176 | gdb_byte *ptr = *readptr; | |
177 | ||
178 | if (endptr == ptr) | |
179 | return 0; | |
180 | ||
181 | if (endptr - ptr < 8 * 2) | |
182 | return -1; | |
183 | ||
184 | *typep = extract_unsigned_integer (ptr, 4, byte_order); | |
185 | ptr += 8; | |
186 | /* The size of data is always 64-bit. If the application is 32-bit, | |
187 | it will be zero extended, as expected. */ | |
188 | *valp = extract_unsigned_integer (ptr, 8, byte_order); | |
189 | ptr += 8; | |
190 | ||
191 | *readptr = ptr; | |
192 | return 1; | |
193 | } | |
194 | #endif | |
195 | ||
196 | /* =================== END, TARGET_OPS "MODULE" =================== */ | |
197 | ||
198 | /* =================== STRUCT PROCINFO "MODULE" =================== */ | |
199 | ||
200 | /* FIXME: this comment will soon be out of date W.R.T. threads. */ | |
201 | ||
202 | /* The procinfo struct is a wrapper to hold all the state information | |
203 | concerning a /proc process. There should be exactly one procinfo | |
204 | for each process, and since GDB currently can debug only one | |
205 | process at a time, that means there should be only one procinfo. | |
206 | All of the LWP's of a process can be accessed indirectly thru the | |
207 | single process procinfo. | |
208 | ||
209 | However, against the day when GDB may debug more than one process, | |
210 | this data structure is kept in a list (which for now will hold no | |
211 | more than one member), and many functions will have a pointer to a | |
212 | procinfo as an argument. | |
213 | ||
214 | There will be a separate procinfo structure for use by the (not yet | |
215 | implemented) "info proc" command, so that we can print useful | |
216 | information about any random process without interfering with the | |
217 | inferior's procinfo information. */ | |
218 | ||
219 | /* format strings for /proc paths */ | |
220 | #define CTL_PROC_NAME_FMT "/proc/%d/ctl" | |
221 | #define AS_PROC_NAME_FMT "/proc/%d/as" | |
222 | #define MAP_PROC_NAME_FMT "/proc/%d/map" | |
223 | #define STATUS_PROC_NAME_FMT "/proc/%d/status" | |
224 | #define MAX_PROC_NAME_SIZE sizeof("/proc/999999/lwp/0123456789/lwpstatus") | |
225 | ||
226 | typedef struct procinfo { | |
227 | struct procinfo *next; | |
228 | int pid; /* Process ID */ | |
229 | int tid; /* Thread/LWP id */ | |
230 | ||
231 | /* process state */ | |
232 | int was_stopped; | |
233 | int ignore_next_sigstop; | |
234 | ||
235 | int ctl_fd; /* File descriptor for /proc control file */ | |
236 | int status_fd; /* File descriptor for /proc status file */ | |
237 | int as_fd; /* File descriptor for /proc as file */ | |
238 | ||
239 | char pathname[MAX_PROC_NAME_SIZE]; /* Pathname to /proc entry */ | |
240 | ||
241 | fltset_t saved_fltset; /* Saved traced hardware fault set */ | |
242 | sigset_t saved_sigset; /* Saved traced signal set */ | |
243 | sigset_t saved_sighold; /* Saved held signal set */ | |
244 | sysset_t *saved_exitset; /* Saved traced system call exit set */ | |
245 | sysset_t *saved_entryset; /* Saved traced system call entry set */ | |
246 | ||
247 | pstatus_t prstatus; /* Current process status info */ | |
248 | ||
249 | struct procinfo *thread_list; | |
250 | ||
251 | int status_valid : 1; | |
252 | int gregs_valid : 1; | |
253 | int fpregs_valid : 1; | |
254 | int threads_valid: 1; | |
255 | } procinfo; | |
256 | ||
257 | static char errmsg[128]; /* shared error msg buffer */ | |
258 | ||
259 | /* Function prototypes for procinfo module: */ | |
260 | ||
261 | static procinfo *find_procinfo_or_die (int pid, int tid); | |
262 | static procinfo *find_procinfo (int pid, int tid); | |
263 | static procinfo *create_procinfo (int pid, int tid); | |
264 | static void destroy_procinfo (procinfo *p); | |
265 | static void dead_procinfo (procinfo *p, const char *msg, int killp); | |
266 | static int open_procinfo_files (procinfo *p, int which); | |
267 | static void close_procinfo_files (procinfo *p); | |
268 | ||
269 | static int iterate_over_mappings | |
270 | (procinfo *pi, find_memory_region_ftype child_func, void *data, | |
271 | int (*func) (struct prmap *map, find_memory_region_ftype child_func, | |
272 | void *data)); | |
273 | ||
274 | /* The head of the procinfo list: */ | |
275 | static procinfo *procinfo_list; | |
276 | ||
277 | /* Search the procinfo list. Return a pointer to procinfo, or NULL if | |
278 | not found. */ | |
279 | ||
280 | static procinfo * | |
281 | find_procinfo (int pid, int tid) | |
282 | { | |
283 | procinfo *pi; | |
284 | ||
285 | for (pi = procinfo_list; pi; pi = pi->next) | |
286 | if (pi->pid == pid) | |
287 | break; | |
288 | ||
289 | if (pi) | |
290 | if (tid) | |
291 | { | |
292 | /* Don't check threads_valid. If we're updating the | |
293 | thread_list, we want to find whatever threads are already | |
294 | here. This means that in general it is the caller's | |
295 | responsibility to check threads_valid and update before | |
296 | calling find_procinfo, if the caller wants to find a new | |
297 | thread. */ | |
298 | ||
299 | for (pi = pi->thread_list; pi; pi = pi->next) | |
300 | if (pi->tid == tid) | |
301 | break; | |
302 | } | |
303 | ||
304 | return pi; | |
305 | } | |
306 | ||
307 | /* Calls find_procinfo, but errors on failure. */ | |
308 | ||
309 | static procinfo * | |
310 | find_procinfo_or_die (int pid, int tid) | |
311 | { | |
312 | procinfo *pi = find_procinfo (pid, tid); | |
313 | ||
314 | if (pi == NULL) | |
315 | { | |
316 | if (tid) | |
317 | error (_("procfs: couldn't find pid %d " | |
318 | "(kernel thread %d) in procinfo list."), | |
319 | pid, tid); | |
320 | else | |
321 | error (_("procfs: couldn't find pid %d in procinfo list."), pid); | |
322 | } | |
323 | return pi; | |
324 | } | |
325 | ||
326 | /* Wrapper for `open'. The appropriate open call is attempted; if | |
327 | unsuccessful, it will be retried as many times as needed for the | |
328 | EAGAIN and EINTR conditions. | |
329 | ||
330 | For other conditions, retry the open a limited number of times. In | |
331 | addition, a short sleep is imposed prior to retrying the open. The | |
332 | reason for this sleep is to give the kernel a chance to catch up | |
333 | and create the file in question in the event that GDB "wins" the | |
334 | race to open a file before the kernel has created it. */ | |
335 | ||
336 | static int | |
337 | open_with_retry (const char *pathname, int flags) | |
338 | { | |
339 | int retries_remaining, status; | |
340 | ||
341 | retries_remaining = 2; | |
342 | ||
343 | while (1) | |
344 | { | |
345 | status = open (pathname, flags); | |
346 | ||
347 | if (status >= 0 || retries_remaining == 0) | |
348 | break; | |
349 | else if (errno != EINTR && errno != EAGAIN) | |
350 | { | |
351 | retries_remaining--; | |
352 | sleep (1); | |
353 | } | |
354 | } | |
355 | ||
356 | return status; | |
357 | } | |
358 | ||
359 | /* Open the file descriptor for the process or LWP. We only open the | |
360 | control file descriptor; the others are opened lazily as needed. | |
361 | Returns the file descriptor, or zero for failure. */ | |
362 | ||
363 | enum { FD_CTL, FD_STATUS, FD_AS }; | |
364 | ||
365 | static int | |
366 | open_procinfo_files (procinfo *pi, int which) | |
367 | { | |
368 | char tmp[MAX_PROC_NAME_SIZE]; | |
369 | int fd; | |
370 | ||
371 | /* This function is getting ALMOST long enough to break up into | |
372 | several. Here is some rationale: | |
373 | ||
374 | There are several file descriptors that may need to be open | |
375 | for any given process or LWP. The ones we're interested in are: | |
376 | - control (ctl) write-only change the state | |
377 | - status (status) read-only query the state | |
378 | - address space (as) read/write access memory | |
379 | - map (map) read-only virtual addr map | |
380 | Most of these are opened lazily as they are needed. | |
381 | The pathnames for the 'files' for an LWP look slightly | |
382 | different from those of a first-class process: | |
383 | Pathnames for a process (<proc-id>): | |
384 | /proc/<proc-id>/ctl | |
385 | /proc/<proc-id>/status | |
386 | /proc/<proc-id>/as | |
387 | /proc/<proc-id>/map | |
388 | Pathnames for an LWP (lwp-id): | |
389 | /proc/<proc-id>/lwp/<lwp-id>/lwpctl | |
390 | /proc/<proc-id>/lwp/<lwp-id>/lwpstatus | |
391 | An LWP has no map or address space file descriptor, since | |
392 | the memory map and address space are shared by all LWPs. */ | |
393 | ||
394 | /* In this case, there are several different file descriptors that | |
395 | we might be asked to open. The control file descriptor will be | |
396 | opened early, but the others will be opened lazily as they are | |
397 | needed. */ | |
398 | ||
399 | strcpy (tmp, pi->pathname); | |
400 | switch (which) { /* Which file descriptor to open? */ | |
401 | case FD_CTL: | |
402 | if (pi->tid) | |
403 | strcat (tmp, "/lwpctl"); | |
404 | else | |
405 | strcat (tmp, "/ctl"); | |
406 | fd = open_with_retry (tmp, O_WRONLY); | |
407 | if (fd < 0) | |
408 | return 0; /* fail */ | |
409 | pi->ctl_fd = fd; | |
410 | break; | |
411 | case FD_AS: | |
412 | if (pi->tid) | |
413 | return 0; /* There is no 'as' file descriptor for an lwp. */ | |
414 | strcat (tmp, "/as"); | |
415 | fd = open_with_retry (tmp, O_RDWR); | |
416 | if (fd < 0) | |
417 | return 0; /* fail */ | |
418 | pi->as_fd = fd; | |
419 | break; | |
420 | case FD_STATUS: | |
421 | if (pi->tid) | |
422 | strcat (tmp, "/lwpstatus"); | |
423 | else | |
424 | strcat (tmp, "/status"); | |
425 | fd = open_with_retry (tmp, O_RDONLY); | |
426 | if (fd < 0) | |
427 | return 0; /* fail */ | |
428 | pi->status_fd = fd; | |
429 | break; | |
430 | default: | |
431 | return 0; /* unknown file descriptor */ | |
432 | } | |
433 | ||
434 | return 1; /* success */ | |
435 | } | |
436 | ||
437 | /* Allocate a data structure and link it into the procinfo list. | |
438 | First tries to find a pre-existing one (FIXME: why?). Returns the | |
439 | pointer to new procinfo struct. */ | |
440 | ||
441 | static procinfo * | |
442 | create_procinfo (int pid, int tid) | |
443 | { | |
444 | procinfo *pi, *parent = NULL; | |
445 | ||
446 | pi = find_procinfo (pid, tid); | |
447 | if (pi != NULL) | |
448 | return pi; /* Already exists, nothing to do. */ | |
449 | ||
450 | /* Find parent before doing malloc, to save having to cleanup. */ | |
451 | if (tid != 0) | |
452 | parent = find_procinfo_or_die (pid, 0); /* FIXME: should I | |
453 | create it if it | |
454 | doesn't exist yet? */ | |
455 | ||
456 | pi = XNEW (procinfo); | |
457 | memset (pi, 0, sizeof (procinfo)); | |
458 | pi->pid = pid; | |
459 | pi->tid = tid; | |
460 | ||
461 | pi->saved_entryset = XNEW (sysset_t); | |
462 | pi->saved_exitset = XNEW (sysset_t); | |
463 | ||
464 | /* Chain into list. */ | |
465 | if (tid == 0) | |
466 | { | |
467 | xsnprintf (pi->pathname, sizeof (pi->pathname), "/proc/%d", pid); | |
468 | pi->next = procinfo_list; | |
469 | procinfo_list = pi; | |
470 | } | |
471 | else | |
472 | { | |
473 | xsnprintf (pi->pathname, sizeof (pi->pathname), "/proc/%d/lwp/%d", | |
474 | pid, tid); | |
475 | pi->next = parent->thread_list; | |
476 | parent->thread_list = pi; | |
477 | } | |
478 | return pi; | |
479 | } | |
480 | ||
481 | /* Close all file descriptors associated with the procinfo. */ | |
482 | ||
483 | static void | |
484 | close_procinfo_files (procinfo *pi) | |
485 | { | |
486 | if (pi->ctl_fd > 0) | |
487 | close (pi->ctl_fd); | |
488 | if (pi->as_fd > 0) | |
489 | close (pi->as_fd); | |
490 | if (pi->status_fd > 0) | |
491 | close (pi->status_fd); | |
492 | pi->ctl_fd = pi->as_fd = pi->status_fd = 0; | |
493 | } | |
494 | ||
495 | /* Destructor function. Close, unlink and deallocate the object. */ | |
496 | ||
497 | static void | |
498 | destroy_one_procinfo (procinfo **list, procinfo *pi) | |
499 | { | |
500 | procinfo *ptr; | |
501 | ||
502 | /* Step one: unlink the procinfo from its list. */ | |
503 | if (pi == *list) | |
504 | *list = pi->next; | |
505 | else | |
506 | for (ptr = *list; ptr; ptr = ptr->next) | |
507 | if (ptr->next == pi) | |
508 | { | |
509 | ptr->next = pi->next; | |
510 | break; | |
511 | } | |
512 | ||
513 | /* Step two: close any open file descriptors. */ | |
514 | close_procinfo_files (pi); | |
515 | ||
516 | /* Step three: free the memory. */ | |
517 | xfree (pi->saved_entryset); | |
518 | xfree (pi->saved_exitset); | |
519 | xfree (pi); | |
520 | } | |
521 | ||
522 | static void | |
523 | destroy_procinfo (procinfo *pi) | |
524 | { | |
525 | procinfo *tmp; | |
526 | ||
527 | if (pi->tid != 0) /* Destroy a thread procinfo. */ | |
528 | { | |
529 | tmp = find_procinfo (pi->pid, 0); /* Find the parent process. */ | |
530 | destroy_one_procinfo (&tmp->thread_list, pi); | |
531 | } | |
532 | else /* Destroy a process procinfo and all its threads. */ | |
533 | { | |
534 | /* First destroy the children, if any; */ | |
535 | while (pi->thread_list != NULL) | |
536 | destroy_one_procinfo (&pi->thread_list, pi->thread_list); | |
537 | /* Then destroy the parent. Genocide!!! */ | |
538 | destroy_one_procinfo (&procinfo_list, pi); | |
539 | } | |
540 | } | |
541 | ||
542 | /* A deleter that calls destroy_procinfo. */ | |
543 | struct procinfo_deleter | |
544 | { | |
545 | void operator() (procinfo *pi) const | |
546 | { | |
547 | destroy_procinfo (pi); | |
548 | } | |
549 | }; | |
550 | ||
551 | typedef std::unique_ptr<procinfo, procinfo_deleter> procinfo_up; | |
552 | ||
553 | enum { NOKILL, KILL }; | |
554 | ||
555 | /* To be called on a non_recoverable error for a procinfo. Prints | |
556 | error messages, optionally sends a SIGKILL to the process, then | |
557 | destroys the data structure. */ | |
558 | ||
559 | static void | |
560 | dead_procinfo (procinfo *pi, const char *msg, int kill_p) | |
561 | { | |
562 | char procfile[80]; | |
563 | ||
564 | if (pi->pathname) | |
565 | print_sys_errmsg (pi->pathname, errno); | |
566 | else | |
567 | { | |
568 | xsnprintf (procfile, sizeof (procfile), "process %d", pi->pid); | |
569 | print_sys_errmsg (procfile, errno); | |
570 | } | |
571 | if (kill_p == KILL) | |
572 | kill (pi->pid, SIGKILL); | |
573 | ||
574 | destroy_procinfo (pi); | |
575 | error ("%s", msg); | |
576 | } | |
577 | ||
578 | /* =================== END, STRUCT PROCINFO "MODULE" =================== */ | |
579 | ||
580 | /* =================== /proc "MODULE" =================== */ | |
581 | ||
582 | /* This "module" is the interface layer between the /proc system API | |
583 | and the gdb target vector functions. This layer consists of access | |
584 | functions that encapsulate each of the basic operations that we | |
585 | need to use from the /proc API. | |
586 | ||
587 | The main motivation for this layer is to hide the fact that there | |
588 | were two very different implementations of the /proc API. */ | |
589 | ||
590 | static long proc_flags (procinfo *pi); | |
591 | static int proc_why (procinfo *pi); | |
592 | static int proc_what (procinfo *pi); | |
593 | static int proc_set_current_signal (procinfo *pi, int signo); | |
594 | static int proc_get_current_thread (procinfo *pi); | |
595 | static int proc_iterate_over_threads | |
596 | (procinfo *pi, | |
597 | int (*func) (procinfo *, procinfo *, void *), | |
598 | void *ptr); | |
599 | ||
600 | static void | |
601 | proc_warn (procinfo *pi, const char *func, int line) | |
602 | { | |
603 | xsnprintf (errmsg, sizeof (errmsg), "procfs: %s line %d, %s", | |
604 | func, line, pi->pathname); | |
605 | print_sys_errmsg (errmsg, errno); | |
606 | } | |
607 | ||
608 | static void | |
609 | proc_error (procinfo *pi, const char *func, int line) | |
610 | { | |
611 | xsnprintf (errmsg, sizeof (errmsg), "procfs: %s line %d, %s", | |
612 | func, line, pi->pathname); | |
613 | perror_with_name (errmsg); | |
614 | } | |
615 | ||
616 | /* Updates the status struct in the procinfo. There is a 'valid' | |
617 | flag, to let other functions know when this function needs to be | |
618 | called (so the status is only read when it is needed). The status | |
619 | file descriptor is also only opened when it is needed. Returns | |
620 | non-zero for success, zero for failure. */ | |
621 | ||
622 | static int | |
623 | proc_get_status (procinfo *pi) | |
624 | { | |
625 | /* Status file descriptor is opened "lazily". */ | |
626 | if (pi->status_fd == 0 && open_procinfo_files (pi, FD_STATUS) == 0) | |
627 | { | |
628 | pi->status_valid = 0; | |
629 | return 0; | |
630 | } | |
631 | ||
632 | if (lseek (pi->status_fd, 0, SEEK_SET) < 0) | |
633 | pi->status_valid = 0; /* fail */ | |
634 | else | |
635 | { | |
636 | /* Sigh... I have to read a different data structure, | |
637 | depending on whether this is a main process or an LWP. */ | |
638 | if (pi->tid) | |
639 | pi->status_valid = (read (pi->status_fd, | |
640 | (char *) &pi->prstatus.pr_lwp, | |
641 | sizeof (lwpstatus_t)) | |
642 | == sizeof (lwpstatus_t)); | |
643 | else | |
644 | { | |
645 | pi->status_valid = (read (pi->status_fd, | |
646 | (char *) &pi->prstatus, | |
647 | sizeof (pstatus_t)) | |
648 | == sizeof (pstatus_t)); | |
649 | } | |
650 | } | |
651 | ||
652 | if (pi->status_valid) | |
653 | { | |
654 | PROC_PRETTYFPRINT_STATUS (proc_flags (pi), | |
655 | proc_why (pi), | |
656 | proc_what (pi), | |
657 | proc_get_current_thread (pi)); | |
658 | } | |
659 | ||
660 | /* The status struct includes general regs, so mark them valid too. */ | |
661 | pi->gregs_valid = pi->status_valid; | |
662 | /* In the read/write multiple-fd model, the status struct includes | |
663 | the fp regs too, so mark them valid too. */ | |
664 | pi->fpregs_valid = pi->status_valid; | |
665 | return pi->status_valid; /* True if success, false if failure. */ | |
666 | } | |
667 | ||
668 | /* Returns the process flags (pr_flags field). */ | |
669 | ||
670 | static long | |
671 | proc_flags (procinfo *pi) | |
672 | { | |
673 | if (!pi->status_valid) | |
674 | if (!proc_get_status (pi)) | |
675 | return 0; /* FIXME: not a good failure value (but what is?) */ | |
676 | ||
677 | return pi->prstatus.pr_lwp.pr_flags; | |
678 | } | |
679 | ||
680 | /* Returns the pr_why field (why the process stopped). */ | |
681 | ||
682 | static int | |
683 | proc_why (procinfo *pi) | |
684 | { | |
685 | if (!pi->status_valid) | |
686 | if (!proc_get_status (pi)) | |
687 | return 0; /* FIXME: not a good failure value (but what is?) */ | |
688 | ||
689 | return pi->prstatus.pr_lwp.pr_why; | |
690 | } | |
691 | ||
692 | /* Returns the pr_what field (details of why the process stopped). */ | |
693 | ||
694 | static int | |
695 | proc_what (procinfo *pi) | |
696 | { | |
697 | if (!pi->status_valid) | |
698 | if (!proc_get_status (pi)) | |
699 | return 0; /* FIXME: not a good failure value (but what is?) */ | |
700 | ||
701 | return pi->prstatus.pr_lwp.pr_what; | |
702 | } | |
703 | ||
704 | /* This function is only called when PI is stopped by a watchpoint. | |
705 | Assuming the OS supports it, write to *ADDR the data address which | |
706 | triggered it and return 1. Return 0 if it is not possible to know | |
707 | the address. */ | |
708 | ||
709 | static int | |
710 | proc_watchpoint_address (procinfo *pi, CORE_ADDR *addr) | |
711 | { | |
712 | if (!pi->status_valid) | |
713 | if (!proc_get_status (pi)) | |
714 | return 0; | |
715 | ||
716 | *addr = (CORE_ADDR) gdbarch_pointer_to_address (target_gdbarch (), | |
717 | builtin_type (target_gdbarch ())->builtin_data_ptr, | |
718 | (gdb_byte *) &pi->prstatus.pr_lwp.pr_info.si_addr); | |
719 | return 1; | |
720 | } | |
721 | ||
722 | /* Returns the pr_nsysarg field (number of args to the current | |
723 | syscall). */ | |
724 | ||
725 | static int | |
726 | proc_nsysarg (procinfo *pi) | |
727 | { | |
728 | if (!pi->status_valid) | |
729 | if (!proc_get_status (pi)) | |
730 | return 0; | |
731 | ||
732 | return pi->prstatus.pr_lwp.pr_nsysarg; | |
733 | } | |
734 | ||
735 | /* Returns the pr_sysarg field (pointer to the arguments of current | |
736 | syscall). */ | |
737 | ||
738 | static long * | |
739 | proc_sysargs (procinfo *pi) | |
740 | { | |
741 | if (!pi->status_valid) | |
742 | if (!proc_get_status (pi)) | |
743 | return NULL; | |
744 | ||
745 | return (long *) &pi->prstatus.pr_lwp.pr_sysarg; | |
746 | } | |
747 | ||
748 | /* Set or reset any of the following process flags: | |
749 | PR_FORK -- forked child will inherit trace flags | |
750 | PR_RLC -- traced process runs when last /proc file closed. | |
751 | PR_KLC -- traced process is killed when last /proc file closed. | |
752 | PR_ASYNC -- LWP's get to run/stop independently. | |
753 | ||
754 | This function is done using read/write [PCSET/PCRESET/PCUNSET]. | |
755 | ||
756 | Arguments: | |
757 | pi -- the procinfo | |
758 | flag -- one of PR_FORK, PR_RLC, or PR_ASYNC | |
759 | mode -- 1 for set, 0 for reset. | |
760 | ||
761 | Returns non-zero for success, zero for failure. */ | |
762 | ||
763 | enum { FLAG_RESET, FLAG_SET }; | |
764 | ||
765 | static int | |
766 | proc_modify_flag (procinfo *pi, long flag, long mode) | |
767 | { | |
768 | long win = 0; /* default to fail */ | |
769 | ||
770 | /* These operations affect the process as a whole, and applying them | |
771 | to an individual LWP has the same meaning as applying them to the | |
772 | main process. Therefore, if we're ever called with a pointer to | |
773 | an LWP's procinfo, let's substitute the process's procinfo and | |
774 | avoid opening the LWP's file descriptor unnecessarily. */ | |
775 | ||
776 | if (pi->pid != 0) | |
777 | pi = find_procinfo_or_die (pi->pid, 0); | |
778 | ||
779 | procfs_ctl_t arg[2]; | |
780 | ||
781 | if (mode == FLAG_SET) /* Set the flag (RLC, FORK, or ASYNC). */ | |
782 | arg[0] = PCSET; | |
783 | else /* Reset the flag. */ | |
784 | arg[0] = PCUNSET; | |
785 | ||
786 | arg[1] = flag; | |
787 | win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg)); | |
788 | ||
789 | /* The above operation renders the procinfo's cached pstatus | |
790 | obsolete. */ | |
791 | pi->status_valid = 0; | |
792 | ||
793 | if (!win) | |
794 | warning (_("procfs: modify_flag failed to turn %s %s"), | |
795 | flag == PR_FORK ? "PR_FORK" : | |
796 | flag == PR_RLC ? "PR_RLC" : | |
797 | flag == PR_ASYNC ? "PR_ASYNC" : | |
798 | flag == PR_KLC ? "PR_KLC" : | |
799 | "<unknown flag>", | |
800 | mode == FLAG_RESET ? "off" : "on"); | |
801 | ||
802 | return win; | |
803 | } | |
804 | ||
805 | /* Set the run_on_last_close flag. Process with all threads will | |
806 | become runnable when debugger closes all /proc fds. Returns | |
807 | non-zero for success, zero for failure. */ | |
808 | ||
809 | static int | |
810 | proc_set_run_on_last_close (procinfo *pi) | |
811 | { | |
812 | return proc_modify_flag (pi, PR_RLC, FLAG_SET); | |
813 | } | |
814 | ||
815 | /* Reset the run_on_last_close flag. The process will NOT become | |
816 | runnable when debugger closes its file handles. Returns non-zero | |
817 | for success, zero for failure. */ | |
818 | ||
819 | static int | |
820 | proc_unset_run_on_last_close (procinfo *pi) | |
821 | { | |
822 | return proc_modify_flag (pi, PR_RLC, FLAG_RESET); | |
823 | } | |
824 | ||
825 | /* Reset inherit_on_fork flag. If the process forks a child while we | |
826 | are registered for events in the parent, then we will NOT receive | |
827 | events from the child. Returns non-zero for success, zero for | |
828 | failure. */ | |
829 | ||
830 | static int | |
831 | proc_unset_inherit_on_fork (procinfo *pi) | |
832 | { | |
833 | return proc_modify_flag (pi, PR_FORK, FLAG_RESET); | |
834 | } | |
835 | ||
836 | /* Set PR_ASYNC flag. If one LWP stops because of a debug event | |
837 | (signal etc.), the remaining LWPs will continue to run. Returns | |
838 | non-zero for success, zero for failure. */ | |
839 | ||
840 | static int | |
841 | proc_set_async (procinfo *pi) | |
842 | { | |
843 | return proc_modify_flag (pi, PR_ASYNC, FLAG_SET); | |
844 | } | |
845 | ||
846 | /* Reset PR_ASYNC flag. If one LWP stops because of a debug event | |
847 | (signal etc.), then all other LWPs will stop as well. Returns | |
848 | non-zero for success, zero for failure. */ | |
849 | ||
850 | static int | |
851 | proc_unset_async (procinfo *pi) | |
852 | { | |
853 | return proc_modify_flag (pi, PR_ASYNC, FLAG_RESET); | |
854 | } | |
855 | ||
856 | /* Request the process/LWP to stop. Does not wait. Returns non-zero | |
857 | for success, zero for failure. */ | |
858 | ||
859 | static int | |
860 | proc_stop_process (procinfo *pi) | |
861 | { | |
862 | int win; | |
863 | ||
864 | /* We might conceivably apply this operation to an LWP, and the | |
865 | LWP's ctl file descriptor might not be open. */ | |
866 | ||
867 | if (pi->ctl_fd == 0 && open_procinfo_files (pi, FD_CTL) == 0) | |
868 | return 0; | |
869 | else | |
870 | { | |
871 | procfs_ctl_t cmd = PCSTOP; | |
872 | ||
873 | win = (write (pi->ctl_fd, (char *) &cmd, sizeof (cmd)) == sizeof (cmd)); | |
874 | } | |
875 | ||
876 | return win; | |
877 | } | |
878 | ||
879 | /* Wait for the process or LWP to stop (block until it does). Returns | |
880 | non-zero for success, zero for failure. */ | |
881 | ||
882 | static int | |
883 | proc_wait_for_stop (procinfo *pi) | |
884 | { | |
885 | int win; | |
886 | ||
887 | /* We should never have to apply this operation to any procinfo | |
888 | except the one for the main process. If that ever changes for | |
889 | any reason, then take out the following clause and replace it | |
890 | with one that makes sure the ctl_fd is open. */ | |
891 | ||
892 | if (pi->tid != 0) | |
893 | pi = find_procinfo_or_die (pi->pid, 0); | |
894 | ||
895 | procfs_ctl_t cmd = PCWSTOP; | |
896 | ||
897 | set_sigint_trap (); | |
898 | ||
899 | win = (write (pi->ctl_fd, (char *) &cmd, sizeof (cmd)) == sizeof (cmd)); | |
900 | ||
901 | clear_sigint_trap (); | |
902 | ||
903 | /* We been runnin' and we stopped -- need to update status. */ | |
904 | pi->status_valid = 0; | |
905 | ||
906 | return win; | |
907 | } | |
908 | ||
909 | /* Make the process or LWP runnable. | |
910 | ||
911 | Options (not all are implemented): | |
912 | - single-step | |
913 | - clear current fault | |
914 | - clear current signal | |
915 | - abort the current system call | |
916 | - stop as soon as finished with system call | |
917 | ||
918 | Always clears the current fault. PI is the process or LWP to | |
919 | operate on. If STEP is true, set the process or LWP to trap after | |
920 | one instruction. If SIGNO is zero, clear the current signal if | |
921 | any; if non-zero, set the current signal to this one. Returns | |
922 | non-zero for success, zero for failure. */ | |
923 | ||
924 | static int | |
925 | proc_run_process (procinfo *pi, int step, int signo) | |
926 | { | |
927 | int win; | |
928 | int runflags; | |
929 | ||
930 | /* We will probably have to apply this operation to individual | |
931 | threads, so make sure the control file descriptor is open. */ | |
932 | ||
933 | if (pi->ctl_fd == 0 && open_procinfo_files (pi, FD_CTL) == 0) | |
934 | return 0; | |
935 | ||
936 | runflags = PRCFAULT; /* Always clear current fault. */ | |
937 | if (step) | |
938 | runflags |= PRSTEP; | |
939 | if (signo == 0) | |
940 | runflags |= PRCSIG; | |
941 | else if (signo != -1) /* -1 means do nothing W.R.T. signals. */ | |
942 | proc_set_current_signal (pi, signo); | |
943 | ||
944 | procfs_ctl_t cmd[2]; | |
945 | ||
946 | cmd[0] = PCRUN; | |
947 | cmd[1] = runflags; | |
948 | win = (write (pi->ctl_fd, (char *) &cmd, sizeof (cmd)) == sizeof (cmd)); | |
949 | ||
950 | return win; | |
951 | } | |
952 | ||
953 | /* Register to trace signals in the process or LWP. Returns non-zero | |
954 | for success, zero for failure. */ | |
955 | ||
956 | static int | |
957 | proc_set_traced_signals (procinfo *pi, sigset_t *sigset) | |
958 | { | |
959 | int win; | |
960 | ||
961 | /* We should never have to apply this operation to any procinfo | |
962 | except the one for the main process. If that ever changes for | |
963 | any reason, then take out the following clause and replace it | |
964 | with one that makes sure the ctl_fd is open. */ | |
965 | ||
966 | if (pi->tid != 0) | |
967 | pi = find_procinfo_or_die (pi->pid, 0); | |
968 | ||
969 | struct { | |
970 | procfs_ctl_t cmd; | |
971 | /* Use char array to avoid alignment issues. */ | |
972 | char sigset[sizeof (sigset_t)]; | |
973 | } arg; | |
974 | ||
975 | arg.cmd = PCSTRACE; | |
976 | memcpy (&arg.sigset, sigset, sizeof (sigset_t)); | |
977 | ||
978 | win = (write (pi->ctl_fd, (char *) &arg, sizeof (arg)) == sizeof (arg)); | |
979 | ||
980 | /* The above operation renders the procinfo's cached pstatus obsolete. */ | |
981 | pi->status_valid = 0; | |
982 | ||
983 | if (!win) | |
984 | warning (_("procfs: set_traced_signals failed")); | |
985 | return win; | |
986 | } | |
987 | ||
988 | /* Register to trace hardware faults in the process or LWP. Returns | |
989 | non-zero for success, zero for failure. */ | |
990 | ||
991 | static int | |
992 | proc_set_traced_faults (procinfo *pi, fltset_t *fltset) | |
993 | { | |
994 | int win; | |
995 | ||
996 | /* We should never have to apply this operation to any procinfo | |
997 | except the one for the main process. If that ever changes for | |
998 | any reason, then take out the following clause and replace it | |
999 | with one that makes sure the ctl_fd is open. */ | |
1000 | ||
1001 | if (pi->tid != 0) | |
1002 | pi = find_procinfo_or_die (pi->pid, 0); | |
1003 | ||
1004 | struct { | |
1005 | procfs_ctl_t cmd; | |
1006 | /* Use char array to avoid alignment issues. */ | |
1007 | char fltset[sizeof (fltset_t)]; | |
1008 | } arg; | |
1009 | ||
1010 | arg.cmd = PCSFAULT; | |
1011 | memcpy (&arg.fltset, fltset, sizeof (fltset_t)); | |
1012 | ||
1013 | win = (write (pi->ctl_fd, (char *) &arg, sizeof (arg)) == sizeof (arg)); | |
1014 | ||
1015 | /* The above operation renders the procinfo's cached pstatus obsolete. */ | |
1016 | pi->status_valid = 0; | |
1017 | ||
1018 | return win; | |
1019 | } | |
1020 | ||
1021 | /* Register to trace entry to system calls in the process or LWP. | |
1022 | Returns non-zero for success, zero for failure. */ | |
1023 | ||
1024 | static int | |
1025 | proc_set_traced_sysentry (procinfo *pi, sysset_t *sysset) | |
1026 | { | |
1027 | int win; | |
1028 | ||
1029 | /* We should never have to apply this operation to any procinfo | |
1030 | except the one for the main process. If that ever changes for | |
1031 | any reason, then take out the following clause and replace it | |
1032 | with one that makes sure the ctl_fd is open. */ | |
1033 | ||
1034 | if (pi->tid != 0) | |
1035 | pi = find_procinfo_or_die (pi->pid, 0); | |
1036 | ||
1037 | struct { | |
1038 | procfs_ctl_t cmd; | |
1039 | /* Use char array to avoid alignment issues. */ | |
1040 | char sysset[sizeof (sysset_t)]; | |
1041 | } arg; | |
1042 | ||
1043 | arg.cmd = PCSENTRY; | |
1044 | memcpy (&arg.sysset, sysset, sizeof (sysset_t)); | |
1045 | ||
1046 | win = (write (pi->ctl_fd, (char *) &arg, sizeof (arg)) == sizeof (arg)); | |
1047 | ||
1048 | /* The above operation renders the procinfo's cached pstatus | |
1049 | obsolete. */ | |
1050 | pi->status_valid = 0; | |
1051 | ||
1052 | return win; | |
1053 | } | |
1054 | ||
1055 | /* Register to trace exit from system calls in the process or LWP. | |
1056 | Returns non-zero for success, zero for failure. */ | |
1057 | ||
1058 | static int | |
1059 | proc_set_traced_sysexit (procinfo *pi, sysset_t *sysset) | |
1060 | { | |
1061 | int win; | |
1062 | ||
1063 | /* We should never have to apply this operation to any procinfo | |
1064 | except the one for the main process. If that ever changes for | |
1065 | any reason, then take out the following clause and replace it | |
1066 | with one that makes sure the ctl_fd is open. */ | |
1067 | ||
1068 | if (pi->tid != 0) | |
1069 | pi = find_procinfo_or_die (pi->pid, 0); | |
1070 | ||
1071 | struct gdb_proc_ctl_pcsexit { | |
1072 | procfs_ctl_t cmd; | |
1073 | /* Use char array to avoid alignment issues. */ | |
1074 | char sysset[sizeof (sysset_t)]; | |
1075 | } arg; | |
1076 | ||
1077 | arg.cmd = PCSEXIT; | |
1078 | memcpy (&arg.sysset, sysset, sizeof (sysset_t)); | |
1079 | ||
1080 | win = (write (pi->ctl_fd, (char *) &arg, sizeof (arg)) == sizeof (arg)); | |
1081 | ||
1082 | /* The above operation renders the procinfo's cached pstatus | |
1083 | obsolete. */ | |
1084 | pi->status_valid = 0; | |
1085 | ||
1086 | return win; | |
1087 | } | |
1088 | ||
1089 | /* Specify the set of blocked / held signals in the process or LWP. | |
1090 | Returns non-zero for success, zero for failure. */ | |
1091 | ||
1092 | static int | |
1093 | proc_set_held_signals (procinfo *pi, sigset_t *sighold) | |
1094 | { | |
1095 | int win; | |
1096 | ||
1097 | /* We should never have to apply this operation to any procinfo | |
1098 | except the one for the main process. If that ever changes for | |
1099 | any reason, then take out the following clause and replace it | |
1100 | with one that makes sure the ctl_fd is open. */ | |
1101 | ||
1102 | if (pi->tid != 0) | |
1103 | pi = find_procinfo_or_die (pi->pid, 0); | |
1104 | ||
1105 | struct { | |
1106 | procfs_ctl_t cmd; | |
1107 | /* Use char array to avoid alignment issues. */ | |
1108 | char hold[sizeof (sigset_t)]; | |
1109 | } arg; | |
1110 | ||
1111 | arg.cmd = PCSHOLD; | |
1112 | memcpy (&arg.hold, sighold, sizeof (sigset_t)); | |
1113 | win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg)); | |
1114 | ||
1115 | /* The above operation renders the procinfo's cached pstatus | |
1116 | obsolete. */ | |
1117 | pi->status_valid = 0; | |
1118 | ||
1119 | return win; | |
1120 | } | |
1121 | ||
1122 | /* Returns the set of signals that are held / blocked. Will also copy | |
1123 | the sigset if SAVE is non-zero. */ | |
1124 | ||
1125 | static sigset_t * | |
1126 | proc_get_held_signals (procinfo *pi, sigset_t *save) | |
1127 | { | |
1128 | sigset_t *ret = NULL; | |
1129 | ||
1130 | /* We should never have to apply this operation to any procinfo | |
1131 | except the one for the main process. If that ever changes for | |
1132 | any reason, then take out the following clause and replace it | |
1133 | with one that makes sure the ctl_fd is open. */ | |
1134 | ||
1135 | if (pi->tid != 0) | |
1136 | pi = find_procinfo_or_die (pi->pid, 0); | |
1137 | ||
1138 | if (!pi->status_valid) | |
1139 | if (!proc_get_status (pi)) | |
1140 | return NULL; | |
1141 | ||
1142 | ret = &pi->prstatus.pr_lwp.pr_lwphold; | |
1143 | if (save && ret) | |
1144 | memcpy (save, ret, sizeof (sigset_t)); | |
1145 | ||
1146 | return ret; | |
1147 | } | |
1148 | ||
1149 | /* Returns the set of signals that are traced / debugged. Will also | |
1150 | copy the sigset if SAVE is non-zero. */ | |
1151 | ||
1152 | static sigset_t * | |
1153 | proc_get_traced_signals (procinfo *pi, sigset_t *save) | |
1154 | { | |
1155 | sigset_t *ret = NULL; | |
1156 | ||
1157 | /* We should never have to apply this operation to any procinfo | |
1158 | except the one for the main process. If that ever changes for | |
1159 | any reason, then take out the following clause and replace it | |
1160 | with one that makes sure the ctl_fd is open. */ | |
1161 | ||
1162 | if (pi->tid != 0) | |
1163 | pi = find_procinfo_or_die (pi->pid, 0); | |
1164 | ||
1165 | if (!pi->status_valid) | |
1166 | if (!proc_get_status (pi)) | |
1167 | return NULL; | |
1168 | ||
1169 | ret = &pi->prstatus.pr_sigtrace; | |
1170 | if (save && ret) | |
1171 | memcpy (save, ret, sizeof (sigset_t)); | |
1172 | ||
1173 | return ret; | |
1174 | } | |
1175 | ||
1176 | /* Returns the set of hardware faults that are traced /debugged. Will | |
1177 | also copy the faultset if SAVE is non-zero. */ | |
1178 | ||
1179 | static fltset_t * | |
1180 | proc_get_traced_faults (procinfo *pi, fltset_t *save) | |
1181 | { | |
1182 | fltset_t *ret = NULL; | |
1183 | ||
1184 | /* We should never have to apply this operation to any procinfo | |
1185 | except the one for the main process. If that ever changes for | |
1186 | any reason, then take out the following clause and replace it | |
1187 | with one that makes sure the ctl_fd is open. */ | |
1188 | ||
1189 | if (pi->tid != 0) | |
1190 | pi = find_procinfo_or_die (pi->pid, 0); | |
1191 | ||
1192 | if (!pi->status_valid) | |
1193 | if (!proc_get_status (pi)) | |
1194 | return NULL; | |
1195 | ||
1196 | ret = &pi->prstatus.pr_flttrace; | |
1197 | if (save && ret) | |
1198 | memcpy (save, ret, sizeof (fltset_t)); | |
1199 | ||
1200 | return ret; | |
1201 | } | |
1202 | ||
1203 | /* Returns the set of syscalls that are traced /debugged on entry. | |
1204 | Will also copy the syscall set if SAVE is non-zero. */ | |
1205 | ||
1206 | static sysset_t * | |
1207 | proc_get_traced_sysentry (procinfo *pi, sysset_t *save) | |
1208 | { | |
1209 | sysset_t *ret = NULL; | |
1210 | ||
1211 | /* We should never have to apply this operation to any procinfo | |
1212 | except the one for the main process. If that ever changes for | |
1213 | any reason, then take out the following clause and replace it | |
1214 | with one that makes sure the ctl_fd is open. */ | |
1215 | ||
1216 | if (pi->tid != 0) | |
1217 | pi = find_procinfo_or_die (pi->pid, 0); | |
1218 | ||
1219 | if (!pi->status_valid) | |
1220 | if (!proc_get_status (pi)) | |
1221 | return NULL; | |
1222 | ||
1223 | ret = &pi->prstatus.pr_sysentry; | |
1224 | if (save && ret) | |
1225 | memcpy (save, ret, sizeof (sysset_t)); | |
1226 | ||
1227 | return ret; | |
1228 | } | |
1229 | ||
1230 | /* Returns the set of syscalls that are traced /debugged on exit. | |
1231 | Will also copy the syscall set if SAVE is non-zero. */ | |
1232 | ||
1233 | static sysset_t * | |
1234 | proc_get_traced_sysexit (procinfo *pi, sysset_t *save) | |
1235 | { | |
1236 | sysset_t *ret = NULL; | |
1237 | ||
1238 | /* We should never have to apply this operation to any procinfo | |
1239 | except the one for the main process. If that ever changes for | |
1240 | any reason, then take out the following clause and replace it | |
1241 | with one that makes sure the ctl_fd is open. */ | |
1242 | ||
1243 | if (pi->tid != 0) | |
1244 | pi = find_procinfo_or_die (pi->pid, 0); | |
1245 | ||
1246 | if (!pi->status_valid) | |
1247 | if (!proc_get_status (pi)) | |
1248 | return NULL; | |
1249 | ||
1250 | ret = &pi->prstatus.pr_sysexit; | |
1251 | if (save && ret) | |
1252 | memcpy (save, ret, sizeof (sysset_t)); | |
1253 | ||
1254 | return ret; | |
1255 | } | |
1256 | ||
1257 | /* The current fault (if any) is cleared; the associated signal will | |
1258 | not be sent to the process or LWP when it resumes. Returns | |
1259 | non-zero for success, zero for failure. */ | |
1260 | ||
1261 | static int | |
1262 | proc_clear_current_fault (procinfo *pi) | |
1263 | { | |
1264 | int win; | |
1265 | ||
1266 | /* We should never have to apply this operation to any procinfo | |
1267 | except the one for the main process. If that ever changes for | |
1268 | any reason, then take out the following clause and replace it | |
1269 | with one that makes sure the ctl_fd is open. */ | |
1270 | ||
1271 | if (pi->tid != 0) | |
1272 | pi = find_procinfo_or_die (pi->pid, 0); | |
1273 | ||
1274 | procfs_ctl_t cmd = PCCFAULT; | |
1275 | ||
1276 | win = (write (pi->ctl_fd, (void *) &cmd, sizeof (cmd)) == sizeof (cmd)); | |
1277 | ||
1278 | return win; | |
1279 | } | |
1280 | ||
1281 | /* Set the "current signal" that will be delivered next to the | |
1282 | process. NOTE: semantics are different from those of KILL. This | |
1283 | signal will be delivered to the process or LWP immediately when it | |
1284 | is resumed (even if the signal is held/blocked); it will NOT | |
1285 | immediately cause another event of interest, and will NOT first | |
1286 | trap back to the debugger. Returns non-zero for success, zero for | |
1287 | failure. */ | |
1288 | ||
1289 | static int | |
1290 | proc_set_current_signal (procinfo *pi, int signo) | |
1291 | { | |
1292 | int win; | |
1293 | struct { | |
1294 | procfs_ctl_t cmd; | |
1295 | /* Use char array to avoid alignment issues. */ | |
1296 | char sinfo[sizeof (siginfo_t)]; | |
1297 | } arg; | |
1298 | siginfo_t mysinfo; | |
1299 | process_stratum_target *wait_target; | |
1300 | ptid_t wait_ptid; | |
1301 | struct target_waitstatus wait_status; | |
1302 | ||
1303 | /* We should never have to apply this operation to any procinfo | |
1304 | except the one for the main process. If that ever changes for | |
1305 | any reason, then take out the following clause and replace it | |
1306 | with one that makes sure the ctl_fd is open. */ | |
1307 | ||
1308 | if (pi->tid != 0) | |
1309 | pi = find_procinfo_or_die (pi->pid, 0); | |
1310 | ||
1311 | /* The pointer is just a type alias. */ | |
1312 | get_last_target_status (&wait_target, &wait_ptid, &wait_status); | |
1313 | if (wait_target == &the_procfs_target | |
1314 | && wait_ptid == inferior_ptid | |
1315 | && wait_status.kind == TARGET_WAITKIND_STOPPED | |
1316 | && wait_status.value.sig == gdb_signal_from_host (signo) | |
1317 | && proc_get_status (pi) | |
1318 | && pi->prstatus.pr_lwp.pr_info.si_signo == signo | |
1319 | ) | |
1320 | /* Use the siginfo associated with the signal being | |
1321 | redelivered. */ | |
1322 | memcpy (arg.sinfo, &pi->prstatus.pr_lwp.pr_info, sizeof (siginfo_t)); | |
1323 | else | |
1324 | { | |
1325 | mysinfo.si_signo = signo; | |
1326 | mysinfo.si_code = 0; | |
1327 | mysinfo.si_pid = getpid (); /* ?why? */ | |
1328 | mysinfo.si_uid = getuid (); /* ?why? */ | |
1329 | memcpy (arg.sinfo, &mysinfo, sizeof (siginfo_t)); | |
1330 | } | |
1331 | ||
1332 | arg.cmd = PCSSIG; | |
1333 | win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg)); | |
1334 | ||
1335 | return win; | |
1336 | } | |
1337 | ||
1338 | /* The current signal (if any) is cleared, and is not sent to the | |
1339 | process or LWP when it resumes. Returns non-zero for success, zero | |
1340 | for failure. */ | |
1341 | ||
1342 | static int | |
1343 | proc_clear_current_signal (procinfo *pi) | |
1344 | { | |
1345 | int win; | |
1346 | ||
1347 | /* We should never have to apply this operation to any procinfo | |
1348 | except the one for the main process. If that ever changes for | |
1349 | any reason, then take out the following clause and replace it | |
1350 | with one that makes sure the ctl_fd is open. */ | |
1351 | ||
1352 | if (pi->tid != 0) | |
1353 | pi = find_procinfo_or_die (pi->pid, 0); | |
1354 | ||
1355 | struct { | |
1356 | procfs_ctl_t cmd; | |
1357 | /* Use char array to avoid alignment issues. */ | |
1358 | char sinfo[sizeof (siginfo_t)]; | |
1359 | } arg; | |
1360 | siginfo_t mysinfo; | |
1361 | ||
1362 | arg.cmd = PCSSIG; | |
1363 | /* The pointer is just a type alias. */ | |
1364 | mysinfo.si_signo = 0; | |
1365 | mysinfo.si_code = 0; | |
1366 | mysinfo.si_errno = 0; | |
1367 | mysinfo.si_pid = getpid (); /* ?why? */ | |
1368 | mysinfo.si_uid = getuid (); /* ?why? */ | |
1369 | memcpy (arg.sinfo, &mysinfo, sizeof (siginfo_t)); | |
1370 | ||
1371 | win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg)); | |
1372 | ||
1373 | return win; | |
1374 | } | |
1375 | ||
1376 | /* Return the general-purpose registers for the process or LWP | |
1377 | corresponding to PI. Upon failure, return NULL. */ | |
1378 | ||
1379 | static gdb_gregset_t * | |
1380 | proc_get_gregs (procinfo *pi) | |
1381 | { | |
1382 | if (!pi->status_valid || !pi->gregs_valid) | |
1383 | if (!proc_get_status (pi)) | |
1384 | return NULL; | |
1385 | ||
1386 | return &pi->prstatus.pr_lwp.pr_reg; | |
1387 | } | |
1388 | ||
1389 | /* Return the general-purpose registers for the process or LWP | |
1390 | corresponding to PI. Upon failure, return NULL. */ | |
1391 | ||
1392 | static gdb_fpregset_t * | |
1393 | proc_get_fpregs (procinfo *pi) | |
1394 | { | |
1395 | if (!pi->status_valid || !pi->fpregs_valid) | |
1396 | if (!proc_get_status (pi)) | |
1397 | return NULL; | |
1398 | ||
1399 | return &pi->prstatus.pr_lwp.pr_fpreg; | |
1400 | } | |
1401 | ||
1402 | /* Write the general-purpose registers back to the process or LWP | |
1403 | corresponding to PI. Return non-zero for success, zero for | |
1404 | failure. */ | |
1405 | ||
1406 | static int | |
1407 | proc_set_gregs (procinfo *pi) | |
1408 | { | |
1409 | gdb_gregset_t *gregs; | |
1410 | int win; | |
1411 | ||
1412 | gregs = proc_get_gregs (pi); | |
1413 | if (gregs == NULL) | |
1414 | return 0; /* proc_get_regs has already warned. */ | |
1415 | ||
1416 | if (pi->ctl_fd == 0 && open_procinfo_files (pi, FD_CTL) == 0) | |
1417 | return 0; | |
1418 | else | |
1419 | { | |
1420 | struct { | |
1421 | procfs_ctl_t cmd; | |
1422 | /* Use char array to avoid alignment issues. */ | |
1423 | char gregs[sizeof (gdb_gregset_t)]; | |
1424 | } arg; | |
1425 | ||
1426 | arg.cmd = PCSREG; | |
1427 | memcpy (&arg.gregs, gregs, sizeof (arg.gregs)); | |
1428 | win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg)); | |
1429 | } | |
1430 | ||
1431 | /* Policy: writing the registers invalidates our cache. */ | |
1432 | pi->gregs_valid = 0; | |
1433 | return win; | |
1434 | } | |
1435 | ||
1436 | /* Write the floating-pointer registers back to the process or LWP | |
1437 | corresponding to PI. Return non-zero for success, zero for | |
1438 | failure. */ | |
1439 | ||
1440 | static int | |
1441 | proc_set_fpregs (procinfo *pi) | |
1442 | { | |
1443 | gdb_fpregset_t *fpregs; | |
1444 | int win; | |
1445 | ||
1446 | fpregs = proc_get_fpregs (pi); | |
1447 | if (fpregs == NULL) | |
1448 | return 0; /* proc_get_fpregs has already warned. */ | |
1449 | ||
1450 | if (pi->ctl_fd == 0 && open_procinfo_files (pi, FD_CTL) == 0) | |
1451 | return 0; | |
1452 | else | |
1453 | { | |
1454 | struct { | |
1455 | procfs_ctl_t cmd; | |
1456 | /* Use char array to avoid alignment issues. */ | |
1457 | char fpregs[sizeof (gdb_fpregset_t)]; | |
1458 | } arg; | |
1459 | ||
1460 | arg.cmd = PCSFPREG; | |
1461 | memcpy (&arg.fpregs, fpregs, sizeof (arg.fpregs)); | |
1462 | win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg)); | |
1463 | } | |
1464 | ||
1465 | /* Policy: writing the registers invalidates our cache. */ | |
1466 | pi->fpregs_valid = 0; | |
1467 | return win; | |
1468 | } | |
1469 | ||
1470 | /* Send a signal to the proc or lwp with the semantics of "kill()". | |
1471 | Returns non-zero for success, zero for failure. */ | |
1472 | ||
1473 | static int | |
1474 | proc_kill (procinfo *pi, int signo) | |
1475 | { | |
1476 | int win; | |
1477 | ||
1478 | /* We might conceivably apply this operation to an LWP, and the | |
1479 | LWP's ctl file descriptor might not be open. */ | |
1480 | ||
1481 | if (pi->ctl_fd == 0 && open_procinfo_files (pi, FD_CTL) == 0) | |
1482 | return 0; | |
1483 | else | |
1484 | { | |
1485 | procfs_ctl_t cmd[2]; | |
1486 | ||
1487 | cmd[0] = PCKILL; | |
1488 | cmd[1] = signo; | |
1489 | win = (write (pi->ctl_fd, (char *) &cmd, sizeof (cmd)) == sizeof (cmd)); | |
1490 | } | |
1491 | ||
1492 | return win; | |
1493 | } | |
1494 | ||
1495 | /* Find the pid of the process that started this one. Returns the | |
1496 | parent process pid, or zero. */ | |
1497 | ||
1498 | static int | |
1499 | proc_parent_pid (procinfo *pi) | |
1500 | { | |
1501 | /* We should never have to apply this operation to any procinfo | |
1502 | except the one for the main process. If that ever changes for | |
1503 | any reason, then take out the following clause and replace it | |
1504 | with one that makes sure the ctl_fd is open. */ | |
1505 | ||
1506 | if (pi->tid != 0) | |
1507 | pi = find_procinfo_or_die (pi->pid, 0); | |
1508 | ||
1509 | if (!pi->status_valid) | |
1510 | if (!proc_get_status (pi)) | |
1511 | return 0; | |
1512 | ||
1513 | return pi->prstatus.pr_ppid; | |
1514 | } | |
1515 | ||
1516 | /* Convert a target address (a.k.a. CORE_ADDR) into a host address | |
1517 | (a.k.a void pointer)! */ | |
1518 | ||
1519 | static void * | |
1520 | procfs_address_to_host_pointer (CORE_ADDR addr) | |
1521 | { | |
1522 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; | |
1523 | void *ptr; | |
1524 | ||
1525 | gdb_assert (sizeof (ptr) == TYPE_LENGTH (ptr_type)); | |
1526 | gdbarch_address_to_pointer (target_gdbarch (), ptr_type, | |
1527 | (gdb_byte *) &ptr, addr); | |
1528 | return ptr; | |
1529 | } | |
1530 | ||
1531 | static int | |
1532 | proc_set_watchpoint (procinfo *pi, CORE_ADDR addr, int len, int wflags) | |
1533 | { | |
1534 | struct { | |
1535 | procfs_ctl_t cmd; | |
1536 | char watch[sizeof (prwatch_t)]; | |
1537 | } arg; | |
1538 | prwatch_t pwatch; | |
1539 | ||
1540 | /* NOTE: cagney/2003-02-01: Even more horrible hack. Need to | |
1541 | convert a target address into something that can be stored in a | |
1542 | native data structure. */ | |
1543 | pwatch.pr_vaddr = (uintptr_t) procfs_address_to_host_pointer (addr); | |
1544 | pwatch.pr_size = len; | |
1545 | pwatch.pr_wflags = wflags; | |
1546 | arg.cmd = PCWATCH; | |
1547 | memcpy (arg.watch, &pwatch, sizeof (prwatch_t)); | |
1548 | return (write (pi->ctl_fd, &arg, sizeof (arg)) == sizeof (arg)); | |
1549 | } | |
1550 | ||
1551 | /* =============== END, non-thread part of /proc "MODULE" =============== */ | |
1552 | ||
1553 | /* =================== Thread "MODULE" =================== */ | |
1554 | ||
1555 | /* Returns the number of threads for the process. */ | |
1556 | ||
1557 | static int | |
1558 | proc_get_nthreads (procinfo *pi) | |
1559 | { | |
1560 | if (!pi->status_valid) | |
1561 | if (!proc_get_status (pi)) | |
1562 | return 0; | |
1563 | ||
1564 | /* Only works for the process procinfo, because the LWP procinfos do not | |
1565 | get prstatus filled in. */ | |
1566 | if (pi->tid != 0) /* Find the parent process procinfo. */ | |
1567 | pi = find_procinfo_or_die (pi->pid, 0); | |
1568 | return pi->prstatus.pr_nlwp; | |
1569 | } | |
1570 | ||
1571 | /* Return the ID of the thread that had an event of interest. | |
1572 | (ie. the one that hit a breakpoint or other traced event). All | |
1573 | other things being equal, this should be the ID of a thread that is | |
1574 | currently executing. */ | |
1575 | ||
1576 | static int | |
1577 | proc_get_current_thread (procinfo *pi) | |
1578 | { | |
1579 | /* Note: this should be applied to the root procinfo for the | |
1580 | process, not to the procinfo for an LWP. If applied to the | |
1581 | procinfo for an LWP, it will simply return that LWP's ID. In | |
1582 | that case, find the parent process procinfo. */ | |
1583 | ||
1584 | if (pi->tid != 0) | |
1585 | pi = find_procinfo_or_die (pi->pid, 0); | |
1586 | ||
1587 | if (!pi->status_valid) | |
1588 | if (!proc_get_status (pi)) | |
1589 | return 0; | |
1590 | ||
1591 | return pi->prstatus.pr_lwp.pr_lwpid; | |
1592 | } | |
1593 | ||
1594 | /* Discover the IDs of all the threads within the process, and create | |
1595 | a procinfo for each of them (chained to the parent). Returns | |
1596 | non-zero for success, zero for failure. */ | |
1597 | ||
1598 | static int | |
1599 | proc_delete_dead_threads (procinfo *parent, procinfo *thread, void *ignore) | |
1600 | { | |
1601 | if (thread && parent) /* sanity */ | |
1602 | { | |
1603 | thread->status_valid = 0; | |
1604 | if (!proc_get_status (thread)) | |
1605 | destroy_one_procinfo (&parent->thread_list, thread); | |
1606 | } | |
1607 | return 0; /* keep iterating */ | |
1608 | } | |
1609 | ||
1610 | static int | |
1611 | proc_update_threads (procinfo *pi) | |
1612 | { | |
1613 | char pathname[MAX_PROC_NAME_SIZE + 16]; | |
1614 | struct dirent *direntry; | |
1615 | procinfo *thread; | |
1616 | gdb_dir_up dirp; | |
1617 | int lwpid; | |
1618 | ||
1619 | /* We should never have to apply this operation to any procinfo | |
1620 | except the one for the main process. If that ever changes for | |
1621 | any reason, then take out the following clause and replace it | |
1622 | with one that makes sure the ctl_fd is open. */ | |
1623 | ||
1624 | if (pi->tid != 0) | |
1625 | pi = find_procinfo_or_die (pi->pid, 0); | |
1626 | ||
1627 | proc_iterate_over_threads (pi, proc_delete_dead_threads, NULL); | |
1628 | ||
1629 | /* Note: this brute-force method was originally devised for Unixware | |
1630 | (support removed since), and will also work on Solaris 2.6 and | |
1631 | 2.7. The original comment mentioned the existence of a much | |
1632 | simpler and more elegant way to do this on Solaris, but didn't | |
1633 | point out what that was. */ | |
1634 | ||
1635 | strcpy (pathname, pi->pathname); | |
1636 | strcat (pathname, "/lwp"); | |
1637 | dirp.reset (opendir (pathname)); | |
1638 | if (dirp == NULL) | |
1639 | proc_error (pi, "update_threads, opendir", __LINE__); | |
1640 | ||
1641 | while ((direntry = readdir (dirp.get ())) != NULL) | |
1642 | if (direntry->d_name[0] != '.') /* skip '.' and '..' */ | |
1643 | { | |
1644 | lwpid = atoi (&direntry->d_name[0]); | |
1645 | thread = create_procinfo (pi->pid, lwpid); | |
1646 | if (thread == NULL) | |
1647 | proc_error (pi, "update_threads, create_procinfo", __LINE__); | |
1648 | } | |
1649 | pi->threads_valid = 1; | |
1650 | return 1; | |
1651 | } | |
1652 | ||
1653 | /* Given a pointer to a function, call that function once for each lwp | |
1654 | in the procinfo list, until the function returns non-zero, in which | |
1655 | event return the value returned by the function. | |
1656 | ||
1657 | Note: this function does NOT call update_threads. If you want to | |
1658 | discover new threads first, you must call that function explicitly. | |
1659 | This function just makes a quick pass over the currently-known | |
1660 | procinfos. | |
1661 | ||
1662 | PI is the parent process procinfo. FUNC is the per-thread | |
1663 | function. PTR is an opaque parameter for function. Returns the | |
1664 | first non-zero return value from the callee, or zero. */ | |
1665 | ||
1666 | static int | |
1667 | proc_iterate_over_threads (procinfo *pi, | |
1668 | int (*func) (procinfo *, procinfo *, void *), | |
1669 | void *ptr) | |
1670 | { | |
1671 | procinfo *thread, *next; | |
1672 | int retval = 0; | |
1673 | ||
1674 | /* We should never have to apply this operation to any procinfo | |
1675 | except the one for the main process. If that ever changes for | |
1676 | any reason, then take out the following clause and replace it | |
1677 | with one that makes sure the ctl_fd is open. */ | |
1678 | ||
1679 | if (pi->tid != 0) | |
1680 | pi = find_procinfo_or_die (pi->pid, 0); | |
1681 | ||
1682 | for (thread = pi->thread_list; thread != NULL; thread = next) | |
1683 | { | |
1684 | next = thread->next; /* In case thread is destroyed. */ | |
1685 | retval = (*func) (pi, thread, ptr); | |
1686 | if (retval != 0) | |
1687 | break; | |
1688 | } | |
1689 | ||
1690 | return retval; | |
1691 | } | |
1692 | ||
1693 | /* =================== END, Thread "MODULE" =================== */ | |
1694 | ||
1695 | /* =================== END, /proc "MODULE" =================== */ | |
1696 | ||
1697 | /* =================== GDB "MODULE" =================== */ | |
1698 | ||
1699 | /* Here are all of the gdb target vector functions and their | |
1700 | friends. */ | |
1701 | ||
1702 | static void do_attach (ptid_t ptid); | |
1703 | static void do_detach (); | |
1704 | static void proc_trace_syscalls_1 (procinfo *pi, int syscallnum, | |
1705 | int entry_or_exit, int mode, int from_tty); | |
1706 | ||
1707 | /* Sets up the inferior to be debugged. Registers to trace signals, | |
1708 | hardware faults, and syscalls. Note: does not set RLC flag: caller | |
1709 | may want to customize that. Returns zero for success (note! | |
1710 | unlike most functions in this module); on failure, returns the LINE | |
1711 | NUMBER where it failed! */ | |
1712 | ||
1713 | static int | |
1714 | procfs_debug_inferior (procinfo *pi) | |
1715 | { | |
1716 | fltset_t traced_faults; | |
1717 | sigset_t traced_signals; | |
1718 | sysset_t *traced_syscall_entries; | |
1719 | sysset_t *traced_syscall_exits; | |
1720 | int status; | |
1721 | ||
1722 | /* Register to trace hardware faults in the child. */ | |
1723 | prfillset (&traced_faults); /* trace all faults... */ | |
1724 | prdelset (&traced_faults, FLTPAGE); /* except page fault. */ | |
1725 | if (!proc_set_traced_faults (pi, &traced_faults)) | |
1726 | return __LINE__; | |
1727 | ||
1728 | /* Initially, register to trace all signals in the child. */ | |
1729 | prfillset (&traced_signals); | |
1730 | if (!proc_set_traced_signals (pi, &traced_signals)) | |
1731 | return __LINE__; | |
1732 | ||
1733 | ||
1734 | /* Register to trace the 'exit' system call (on entry). */ | |
1735 | traced_syscall_entries = XNEW (sysset_t); | |
1736 | premptyset (traced_syscall_entries); | |
1737 | praddset (traced_syscall_entries, SYS_exit); | |
1738 | praddset (traced_syscall_entries, SYS_lwp_exit); | |
1739 | ||
1740 | status = proc_set_traced_sysentry (pi, traced_syscall_entries); | |
1741 | xfree (traced_syscall_entries); | |
1742 | if (!status) | |
1743 | return __LINE__; | |
1744 | ||
1745 | /* Method for tracing exec syscalls. */ | |
1746 | traced_syscall_exits = XNEW (sysset_t); | |
1747 | premptyset (traced_syscall_exits); | |
1748 | praddset (traced_syscall_exits, SYS_execve); | |
1749 | praddset (traced_syscall_exits, SYS_lwp_create); | |
1750 | praddset (traced_syscall_exits, SYS_lwp_exit); | |
1751 | ||
1752 | status = proc_set_traced_sysexit (pi, traced_syscall_exits); | |
1753 | xfree (traced_syscall_exits); | |
1754 | if (!status) | |
1755 | return __LINE__; | |
1756 | ||
1757 | return 0; | |
1758 | } | |
1759 | ||
1760 | void | |
1761 | procfs_target::attach (const char *args, int from_tty) | |
1762 | { | |
1763 | int pid; | |
1764 | ||
1765 | pid = parse_pid_to_attach (args); | |
1766 | ||
1767 | if (pid == getpid ()) | |
1768 | error (_("Attaching GDB to itself is not a good idea...")); | |
1769 | ||
1770 | /* Push the target if needed, ensure it gets un-pushed it if attach fails. */ | |
1771 | target_unpush_up unpusher; | |
1772 | if (!inf->target_is_pushed (this)) | |
1773 | { | |
1774 | current_inferior ()->push_target (this); | |
1775 | unpusher.reset (this); | |
1776 | } | |
1777 | ||
1778 | if (from_tty) | |
1779 | { | |
1780 | const char *exec_file = get_exec_file (0); | |
1781 | ||
1782 | if (exec_file) | |
1783 | printf_filtered (_("Attaching to program `%s', %s\n"), | |
1784 | exec_file, target_pid_to_str (ptid_t (pid)).c_str ()); | |
1785 | else | |
1786 | printf_filtered (_("Attaching to %s\n"), | |
1787 | target_pid_to_str (ptid_t (pid)).c_str ()); | |
1788 | ||
1789 | fflush (stdout); | |
1790 | } | |
1791 | ||
1792 | do_attach (ptid_t (pid)); | |
1793 | ||
1794 | /* Everything went fine, keep the target pushed. */ | |
1795 | unpusher.release (); | |
1796 | } | |
1797 | ||
1798 | void | |
1799 | procfs_target::detach (inferior *inf, int from_tty) | |
1800 | { | |
1801 | int pid = inferior_ptid.pid (); | |
1802 | ||
1803 | if (from_tty) | |
1804 | { | |
1805 | const char *exec_file; | |
1806 | ||
1807 | exec_file = get_exec_file (0); | |
1808 | if (exec_file == NULL) | |
1809 | exec_file = ""; | |
1810 | ||
1811 | printf_filtered (_("Detaching from program: %s, %s\n"), exec_file, | |
1812 | target_pid_to_str (ptid_t (pid)).c_str ()); | |
1813 | } | |
1814 | ||
1815 | do_detach (); | |
1816 | ||
1817 | switch_to_no_thread (); | |
1818 | detach_inferior (inf); | |
1819 | maybe_unpush_target (); | |
1820 | } | |
1821 | ||
1822 | static void | |
1823 | do_attach (ptid_t ptid) | |
1824 | { | |
1825 | procinfo *pi; | |
1826 | struct inferior *inf; | |
1827 | int fail; | |
1828 | int lwpid; | |
1829 | ||
1830 | pi = create_procinfo (ptid.pid (), 0); | |
1831 | if (pi == NULL) | |
1832 | perror (_("procfs: out of memory in 'attach'")); | |
1833 | ||
1834 | if (!open_procinfo_files (pi, FD_CTL)) | |
1835 | { | |
1836 | fprintf_filtered (gdb_stderr, "procfs:%d -- ", __LINE__); | |
1837 | xsnprintf (errmsg, sizeof (errmsg), | |
1838 | "do_attach: couldn't open /proc file for process %d", | |
1839 | ptid.pid ()); | |
1840 | dead_procinfo (pi, errmsg, NOKILL); | |
1841 | } | |
1842 | ||
1843 | /* Stop the process (if it isn't already stopped). */ | |
1844 | if (proc_flags (pi) & (PR_STOPPED | PR_ISTOP)) | |
1845 | { | |
1846 | pi->was_stopped = 1; | |
1847 | proc_prettyprint_why (proc_why (pi), proc_what (pi), 1); | |
1848 | } | |
1849 | else | |
1850 | { | |
1851 | pi->was_stopped = 0; | |
1852 | /* Set the process to run again when we close it. */ | |
1853 | if (!proc_set_run_on_last_close (pi)) | |
1854 | dead_procinfo (pi, "do_attach: couldn't set RLC.", NOKILL); | |
1855 | ||
1856 | /* Now stop the process. */ | |
1857 | if (!proc_stop_process (pi)) | |
1858 | dead_procinfo (pi, "do_attach: couldn't stop the process.", NOKILL); | |
1859 | pi->ignore_next_sigstop = 1; | |
1860 | } | |
1861 | /* Save some of the /proc state to be restored if we detach. */ | |
1862 | if (!proc_get_traced_faults (pi, &pi->saved_fltset)) | |
1863 | dead_procinfo (pi, "do_attach: couldn't save traced faults.", NOKILL); | |
1864 | if (!proc_get_traced_signals (pi, &pi->saved_sigset)) | |
1865 | dead_procinfo (pi, "do_attach: couldn't save traced signals.", NOKILL); | |
1866 | if (!proc_get_traced_sysentry (pi, pi->saved_entryset)) | |
1867 | dead_procinfo (pi, "do_attach: couldn't save traced syscall entries.", | |
1868 | NOKILL); | |
1869 | if (!proc_get_traced_sysexit (pi, pi->saved_exitset)) | |
1870 | dead_procinfo (pi, "do_attach: couldn't save traced syscall exits.", | |
1871 | NOKILL); | |
1872 | if (!proc_get_held_signals (pi, &pi->saved_sighold)) | |
1873 | dead_procinfo (pi, "do_attach: couldn't save held signals.", NOKILL); | |
1874 | ||
1875 | fail = procfs_debug_inferior (pi); | |
1876 | if (fail != 0) | |
1877 | dead_procinfo (pi, "do_attach: failed in procfs_debug_inferior", NOKILL); | |
1878 | ||
1879 | inf = current_inferior (); | |
1880 | inferior_appeared (inf, pi->pid); | |
1881 | /* Let GDB know that the inferior was attached. */ | |
1882 | inf->attach_flag = 1; | |
1883 | ||
1884 | /* Create a procinfo for the current lwp. */ | |
1885 | lwpid = proc_get_current_thread (pi); | |
1886 | create_procinfo (pi->pid, lwpid); | |
1887 | ||
1888 | /* Add it to gdb's thread list. */ | |
1889 | ptid = ptid_t (pi->pid, lwpid, 0); | |
1890 | thread_info *thr = add_thread (&the_procfs_target, ptid); | |
1891 | switch_to_thread (thr); | |
1892 | } | |
1893 | ||
1894 | static void | |
1895 | do_detach () | |
1896 | { | |
1897 | procinfo *pi; | |
1898 | ||
1899 | /* Find procinfo for the main process. */ | |
1900 | pi = find_procinfo_or_die (inferior_ptid.pid (), | |
1901 | 0); /* FIXME: threads */ | |
1902 | ||
1903 | if (!proc_set_traced_signals (pi, &pi->saved_sigset)) | |
1904 | proc_warn (pi, "do_detach, set_traced_signal", __LINE__); | |
1905 | ||
1906 | if (!proc_set_traced_faults (pi, &pi->saved_fltset)) | |
1907 | proc_warn (pi, "do_detach, set_traced_faults", __LINE__); | |
1908 | ||
1909 | if (!proc_set_traced_sysentry (pi, pi->saved_entryset)) | |
1910 | proc_warn (pi, "do_detach, set_traced_sysentry", __LINE__); | |
1911 | ||
1912 | if (!proc_set_traced_sysexit (pi, pi->saved_exitset)) | |
1913 | proc_warn (pi, "do_detach, set_traced_sysexit", __LINE__); | |
1914 | ||
1915 | if (!proc_set_held_signals (pi, &pi->saved_sighold)) | |
1916 | proc_warn (pi, "do_detach, set_held_signals", __LINE__); | |
1917 | ||
1918 | if (proc_flags (pi) & (PR_STOPPED | PR_ISTOP)) | |
1919 | if (!(pi->was_stopped) | |
1920 | || query (_("Was stopped when attached, make it runnable again? "))) | |
1921 | { | |
1922 | /* Clear any pending signal. */ | |
1923 | if (!proc_clear_current_fault (pi)) | |
1924 | proc_warn (pi, "do_detach, clear_current_fault", __LINE__); | |
1925 | ||
1926 | if (!proc_clear_current_signal (pi)) | |
1927 | proc_warn (pi, "do_detach, clear_current_signal", __LINE__); | |
1928 | ||
1929 | if (!proc_set_run_on_last_close (pi)) | |
1930 | proc_warn (pi, "do_detach, set_rlc", __LINE__); | |
1931 | } | |
1932 | ||
1933 | destroy_procinfo (pi); | |
1934 | } | |
1935 | ||
1936 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
1937 | for all registers. | |
1938 | ||
1939 | NOTE: Since the /proc interface cannot give us individual | |
1940 | registers, we pay no attention to REGNUM, and just fetch them all. | |
1941 | This results in the possibility that we will do unnecessarily many | |
1942 | fetches, since we may be called repeatedly for individual | |
1943 | registers. So we cache the results, and mark the cache invalid | |
1944 | when the process is resumed. */ | |
1945 | ||
1946 | void | |
1947 | procfs_target::fetch_registers (struct regcache *regcache, int regnum) | |
1948 | { | |
1949 | gdb_gregset_t *gregs; | |
1950 | procinfo *pi; | |
1951 | ptid_t ptid = regcache->ptid (); | |
1952 | int pid = ptid.pid (); | |
1953 | int tid = ptid.lwp (); | |
1954 | struct gdbarch *gdbarch = regcache->arch (); | |
1955 | ||
1956 | pi = find_procinfo_or_die (pid, tid); | |
1957 | ||
1958 | if (pi == NULL) | |
1959 | error (_("procfs: fetch_registers failed to find procinfo for %s"), | |
1960 | target_pid_to_str (ptid).c_str ()); | |
1961 | ||
1962 | gregs = proc_get_gregs (pi); | |
1963 | if (gregs == NULL) | |
1964 | proc_error (pi, "fetch_registers, get_gregs", __LINE__); | |
1965 | ||
1966 | supply_gregset (regcache, (const gdb_gregset_t *) gregs); | |
1967 | ||
1968 | if (gdbarch_fp0_regnum (gdbarch) >= 0) /* Do we have an FPU? */ | |
1969 | { | |
1970 | gdb_fpregset_t *fpregs; | |
1971 | ||
1972 | if ((regnum >= 0 && regnum < gdbarch_fp0_regnum (gdbarch)) | |
1973 | || regnum == gdbarch_pc_regnum (gdbarch) | |
1974 | || regnum == gdbarch_sp_regnum (gdbarch)) | |
1975 | return; /* Not a floating point register. */ | |
1976 | ||
1977 | fpregs = proc_get_fpregs (pi); | |
1978 | if (fpregs == NULL) | |
1979 | proc_error (pi, "fetch_registers, get_fpregs", __LINE__); | |
1980 | ||
1981 | supply_fpregset (regcache, (const gdb_fpregset_t *) fpregs); | |
1982 | } | |
1983 | } | |
1984 | ||
1985 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
1986 | this for all registers. | |
1987 | ||
1988 | NOTE: Since the /proc interface will not read individual registers, | |
1989 | we will cache these requests until the process is resumed, and only | |
1990 | then write them back to the inferior process. | |
1991 | ||
1992 | FIXME: is that a really bad idea? Have to think about cases where | |
1993 | writing one register might affect the value of others, etc. */ | |
1994 | ||
1995 | void | |
1996 | procfs_target::store_registers (struct regcache *regcache, int regnum) | |
1997 | { | |
1998 | gdb_gregset_t *gregs; | |
1999 | procinfo *pi; | |
2000 | ptid_t ptid = regcache->ptid (); | |
2001 | int pid = ptid.pid (); | |
2002 | int tid = ptid.lwp (); | |
2003 | struct gdbarch *gdbarch = regcache->arch (); | |
2004 | ||
2005 | pi = find_procinfo_or_die (pid, tid); | |
2006 | ||
2007 | if (pi == NULL) | |
2008 | error (_("procfs: store_registers: failed to find procinfo for %s"), | |
2009 | target_pid_to_str (ptid).c_str ()); | |
2010 | ||
2011 | gregs = proc_get_gregs (pi); | |
2012 | if (gregs == NULL) | |
2013 | proc_error (pi, "store_registers, get_gregs", __LINE__); | |
2014 | ||
2015 | fill_gregset (regcache, gregs, regnum); | |
2016 | if (!proc_set_gregs (pi)) | |
2017 | proc_error (pi, "store_registers, set_gregs", __LINE__); | |
2018 | ||
2019 | if (gdbarch_fp0_regnum (gdbarch) >= 0) /* Do we have an FPU? */ | |
2020 | { | |
2021 | gdb_fpregset_t *fpregs; | |
2022 | ||
2023 | if ((regnum >= 0 && regnum < gdbarch_fp0_regnum (gdbarch)) | |
2024 | || regnum == gdbarch_pc_regnum (gdbarch) | |
2025 | || regnum == gdbarch_sp_regnum (gdbarch)) | |
2026 | return; /* Not a floating point register. */ | |
2027 | ||
2028 | fpregs = proc_get_fpregs (pi); | |
2029 | if (fpregs == NULL) | |
2030 | proc_error (pi, "store_registers, get_fpregs", __LINE__); | |
2031 | ||
2032 | fill_fpregset (regcache, fpregs, regnum); | |
2033 | if (!proc_set_fpregs (pi)) | |
2034 | proc_error (pi, "store_registers, set_fpregs", __LINE__); | |
2035 | } | |
2036 | } | |
2037 | ||
2038 | /* Retrieve the next stop event from the child process. If child has | |
2039 | not stopped yet, wait for it to stop. Translate /proc eventcodes | |
2040 | (or possibly wait eventcodes) into gdb internal event codes. | |
2041 | Returns the id of process (and possibly thread) that incurred the | |
2042 | event. Event codes are returned through a pointer parameter. */ | |
2043 | ||
2044 | ptid_t | |
2045 | procfs_target::wait (ptid_t ptid, struct target_waitstatus *status, | |
2046 | target_wait_flags options) | |
2047 | { | |
2048 | /* First cut: loosely based on original version 2.1. */ | |
2049 | procinfo *pi; | |
2050 | int wstat; | |
2051 | int temp_tid; | |
2052 | ptid_t retval, temp_ptid; | |
2053 | int why, what, flags; | |
2054 | int retry = 0; | |
2055 | ||
2056 | wait_again: | |
2057 | ||
2058 | retry++; | |
2059 | wstat = 0; | |
2060 | retval = ptid_t (-1); | |
2061 | ||
2062 | /* Find procinfo for main process. */ | |
2063 | ||
2064 | /* procfs_target currently only supports one inferior. */ | |
2065 | inferior *inf = current_inferior (); | |
2066 | ||
2067 | pi = find_procinfo_or_die (inf->pid, 0); | |
2068 | if (pi) | |
2069 | { | |
2070 | /* We must assume that the status is stale now... */ | |
2071 | pi->status_valid = 0; | |
2072 | pi->gregs_valid = 0; | |
2073 | pi->fpregs_valid = 0; | |
2074 | ||
2075 | #if 0 /* just try this out... */ | |
2076 | flags = proc_flags (pi); | |
2077 | why = proc_why (pi); | |
2078 | if ((flags & PR_STOPPED) && (why == PR_REQUESTED)) | |
2079 | pi->status_valid = 0; /* re-read again, IMMEDIATELY... */ | |
2080 | #endif | |
2081 | /* If child is not stopped, wait for it to stop. */ | |
2082 | if (!(proc_flags (pi) & (PR_STOPPED | PR_ISTOP)) | |
2083 | && !proc_wait_for_stop (pi)) | |
2084 | { | |
2085 | /* wait_for_stop failed: has the child terminated? */ | |
2086 | if (errno == ENOENT) | |
2087 | { | |
2088 | int wait_retval; | |
2089 | ||
2090 | /* /proc file not found; presumably child has terminated. */ | |
2091 | wait_retval = ::wait (&wstat); /* "wait" for the child's exit. */ | |
2092 | ||
2093 | /* Wrong child? */ | |
2094 | if (wait_retval != inf->pid) | |
2095 | error (_("procfs: couldn't stop " | |
2096 | "process %d: wait returned %d."), | |
2097 | inf->pid, wait_retval); | |
2098 | /* FIXME: might I not just use waitpid? | |
2099 | Or try find_procinfo to see if I know about this child? */ | |
2100 | retval = ptid_t (wait_retval); | |
2101 | } | |
2102 | else if (errno == EINTR) | |
2103 | goto wait_again; | |
2104 | else | |
2105 | { | |
2106 | /* Unknown error from wait_for_stop. */ | |
2107 | proc_error (pi, "target_wait (wait_for_stop)", __LINE__); | |
2108 | } | |
2109 | } | |
2110 | else | |
2111 | { | |
2112 | /* This long block is reached if either: | |
2113 | a) the child was already stopped, or | |
2114 | b) we successfully waited for the child with wait_for_stop. | |
2115 | This block will analyze the /proc status, and translate it | |
2116 | into a waitstatus for GDB. | |
2117 | ||
2118 | If we actually had to call wait because the /proc file | |
2119 | is gone (child terminated), then we skip this block, | |
2120 | because we already have a waitstatus. */ | |
2121 | ||
2122 | flags = proc_flags (pi); | |
2123 | why = proc_why (pi); | |
2124 | what = proc_what (pi); | |
2125 | ||
2126 | if (flags & (PR_STOPPED | PR_ISTOP)) | |
2127 | { | |
2128 | /* If it's running async (for single_thread control), | |
2129 | set it back to normal again. */ | |
2130 | if (flags & PR_ASYNC) | |
2131 | if (!proc_unset_async (pi)) | |
2132 | proc_error (pi, "target_wait, unset_async", __LINE__); | |
2133 | ||
2134 | if (info_verbose) | |
2135 | proc_prettyprint_why (why, what, 1); | |
2136 | ||
2137 | /* The 'pid' we will return to GDB is composed of | |
2138 | the process ID plus the lwp ID. */ | |
2139 | retval = ptid_t (pi->pid, proc_get_current_thread (pi), 0); | |
2140 | ||
2141 | switch (why) { | |
2142 | case PR_SIGNALLED: | |
2143 | wstat = (what << 8) | 0177; | |
2144 | break; | |
2145 | case PR_SYSENTRY: | |
2146 | if (what == SYS_lwp_exit) | |
2147 | { | |
2148 | if (print_thread_events) | |
2149 | printf_unfiltered (_("[%s exited]\n"), | |
2150 | target_pid_to_str (retval).c_str ()); | |
2151 | delete_thread (find_thread_ptid (this, retval)); | |
2152 | target_continue_no_signal (ptid); | |
2153 | goto wait_again; | |
2154 | } | |
2155 | else if (what == SYS_exit) | |
2156 | { | |
2157 | /* Handle SYS_exit call only. */ | |
2158 | /* Stopped at entry to SYS_exit. | |
2159 | Make it runnable, resume it, then use | |
2160 | the wait system call to get its exit code. | |
2161 | Proc_run_process always clears the current | |
2162 | fault and signal. | |
2163 | Then return its exit status. */ | |
2164 | pi->status_valid = 0; | |
2165 | wstat = 0; | |
2166 | /* FIXME: what we should do is return | |
2167 | TARGET_WAITKIND_SPURIOUS. */ | |
2168 | if (!proc_run_process (pi, 0, 0)) | |
2169 | proc_error (pi, "target_wait, run_process", __LINE__); | |
2170 | ||
2171 | if (inf->attach_flag) | |
2172 | { | |
2173 | /* Don't call wait: simulate waiting for exit, | |
2174 | return a "success" exit code. Bogus: what if | |
2175 | it returns something else? */ | |
2176 | wstat = 0; | |
2177 | retval = ptid_t (inf->pid); /* ? ? ? */ | |
2178 | } | |
2179 | else | |
2180 | { | |
2181 | int temp = ::wait (&wstat); | |
2182 | ||
2183 | /* FIXME: shouldn't I make sure I get the right | |
2184 | event from the right process? If (for | |
2185 | instance) I have killed an earlier inferior | |
2186 | process but failed to clean up after it | |
2187 | somehow, I could get its termination event | |
2188 | here. */ | |
2189 | ||
2190 | /* If wait returns -1, that's what we return | |
2191 | to GDB. */ | |
2192 | if (temp < 0) | |
2193 | retval = ptid_t (temp); | |
2194 | } | |
2195 | } | |
2196 | else | |
2197 | { | |
2198 | printf_filtered (_("procfs: trapped on entry to ")); | |
2199 | proc_prettyprint_syscall (proc_what (pi), 0); | |
2200 | printf_filtered ("\n"); | |
2201 | ||
2202 | long i, nsysargs, *sysargs; | |
2203 | ||
2204 | nsysargs = proc_nsysarg (pi); | |
2205 | sysargs = proc_sysargs (pi); | |
2206 | ||
2207 | if (nsysargs > 0 && sysargs != NULL) | |
2208 | { | |
2209 | printf_filtered (_("%ld syscall arguments:\n"), | |
2210 | nsysargs); | |
2211 | for (i = 0; i < nsysargs; i++) | |
2212 | printf_filtered ("#%ld: 0x%08lx\n", | |
2213 | i, sysargs[i]); | |
2214 | } | |
2215 | ||
2216 | /* How to keep going without returning to wfi: */ | |
2217 | target_continue_no_signal (ptid); | |
2218 | goto wait_again; | |
2219 | } | |
2220 | break; | |
2221 | case PR_SYSEXIT: | |
2222 | if (what == SYS_execve) | |
2223 | { | |
2224 | /* Hopefully this is our own "fork-child" execing | |
2225 | the real child. Hoax this event into a trap, and | |
2226 | GDB will see the child about to execute its start | |
2227 | address. */ | |
2228 | wstat = (SIGTRAP << 8) | 0177; | |
2229 | } | |
2230 | else if (what == SYS_lwp_create) | |
2231 | { | |
2232 | /* This syscall is somewhat like fork/exec. We | |
2233 | will get the event twice: once for the parent | |
2234 | LWP, and once for the child. We should already | |
2235 | know about the parent LWP, but the child will | |
2236 | be new to us. So, whenever we get this event, | |
2237 | if it represents a new thread, simply add the | |
2238 | thread to the list. */ | |
2239 | ||
2240 | /* If not in procinfo list, add it. */ | |
2241 | temp_tid = proc_get_current_thread (pi); | |
2242 | if (!find_procinfo (pi->pid, temp_tid)) | |
2243 | create_procinfo (pi->pid, temp_tid); | |
2244 | ||
2245 | temp_ptid = ptid_t (pi->pid, temp_tid, 0); | |
2246 | /* If not in GDB's thread list, add it. */ | |
2247 | if (!in_thread_list (this, temp_ptid)) | |
2248 | add_thread (this, temp_ptid); | |
2249 | ||
2250 | target_continue_no_signal (ptid); | |
2251 | goto wait_again; | |
2252 | } | |
2253 | else if (what == SYS_lwp_exit) | |
2254 | { | |
2255 | if (print_thread_events) | |
2256 | printf_unfiltered (_("[%s exited]\n"), | |
2257 | target_pid_to_str (retval).c_str ()); | |
2258 | delete_thread (find_thread_ptid (this, retval)); | |
2259 | status->kind = TARGET_WAITKIND_SPURIOUS; | |
2260 | return retval; | |
2261 | } | |
2262 | else | |
2263 | { | |
2264 | printf_filtered (_("procfs: trapped on exit from ")); | |
2265 | proc_prettyprint_syscall (proc_what (pi), 0); | |
2266 | printf_filtered ("\n"); | |
2267 | ||
2268 | long i, nsysargs, *sysargs; | |
2269 | ||
2270 | nsysargs = proc_nsysarg (pi); | |
2271 | sysargs = proc_sysargs (pi); | |
2272 | ||
2273 | if (nsysargs > 0 && sysargs != NULL) | |
2274 | { | |
2275 | printf_filtered (_("%ld syscall arguments:\n"), | |
2276 | nsysargs); | |
2277 | for (i = 0; i < nsysargs; i++) | |
2278 | printf_filtered ("#%ld: 0x%08lx\n", | |
2279 | i, sysargs[i]); | |
2280 | } | |
2281 | ||
2282 | target_continue_no_signal (ptid); | |
2283 | goto wait_again; | |
2284 | } | |
2285 | break; | |
2286 | case PR_REQUESTED: | |
2287 | #if 0 /* FIXME */ | |
2288 | wstat = (SIGSTOP << 8) | 0177; | |
2289 | break; | |
2290 | #else | |
2291 | if (retry < 5) | |
2292 | { | |
2293 | printf_filtered (_("Retry #%d:\n"), retry); | |
2294 | pi->status_valid = 0; | |
2295 | goto wait_again; | |
2296 | } | |
2297 | else | |
2298 | { | |
2299 | /* If not in procinfo list, add it. */ | |
2300 | temp_tid = proc_get_current_thread (pi); | |
2301 | if (!find_procinfo (pi->pid, temp_tid)) | |
2302 | create_procinfo (pi->pid, temp_tid); | |
2303 | ||
2304 | /* If not in GDB's thread list, add it. */ | |
2305 | temp_ptid = ptid_t (pi->pid, temp_tid, 0); | |
2306 | if (!in_thread_list (this, temp_ptid)) | |
2307 | add_thread (this, temp_ptid); | |
2308 | ||
2309 | status->kind = TARGET_WAITKIND_STOPPED; | |
2310 | status->value.sig = GDB_SIGNAL_0; | |
2311 | return retval; | |
2312 | } | |
2313 | #endif | |
2314 | case PR_JOBCONTROL: | |
2315 | wstat = (what << 8) | 0177; | |
2316 | break; | |
2317 | case PR_FAULTED: | |
2318 | { | |
2319 | int signo = pi->prstatus.pr_lwp.pr_info.si_signo; | |
2320 | if (signo != 0) | |
2321 | wstat = (signo << 8) | 0177; | |
2322 | } | |
2323 | break; | |
2324 | default: /* switch (why) unmatched */ | |
2325 | printf_filtered ("procfs:%d -- ", __LINE__); | |
2326 | printf_filtered (_("child stopped for unknown reason:\n")); | |
2327 | proc_prettyprint_why (why, what, 1); | |
2328 | error (_("... giving up...")); | |
2329 | break; | |
2330 | } | |
2331 | /* Got this far without error: If retval isn't in the | |
2332 | threads database, add it. */ | |
2333 | if (retval.pid () > 0 | |
2334 | && !in_thread_list (this, retval)) | |
2335 | { | |
2336 | /* We have a new thread. We need to add it both to | |
2337 | GDB's list and to our own. If we don't create a | |
2338 | procinfo, resume may be unhappy later. */ | |
2339 | add_thread (this, retval); | |
2340 | if (find_procinfo (retval.pid (), | |
2341 | retval.lwp ()) == NULL) | |
2342 | create_procinfo (retval.pid (), | |
2343 | retval.lwp ()); | |
2344 | } | |
2345 | } | |
2346 | else /* Flags do not indicate STOPPED. */ | |
2347 | { | |
2348 | /* surely this can't happen... */ | |
2349 | printf_filtered ("procfs:%d -- process not stopped.\n", | |
2350 | __LINE__); | |
2351 | proc_prettyprint_flags (flags, 1); | |
2352 | error (_("procfs: ...giving up...")); | |
2353 | } | |
2354 | } | |
2355 | ||
2356 | if (status) | |
2357 | store_waitstatus (status, wstat); | |
2358 | } | |
2359 | ||
2360 | return retval; | |
2361 | } | |
2362 | ||
2363 | /* Perform a partial transfer to/from the specified object. For | |
2364 | memory transfers, fall back to the old memory xfer functions. */ | |
2365 | ||
2366 | enum target_xfer_status | |
2367 | procfs_target::xfer_partial (enum target_object object, | |
2368 | const char *annex, gdb_byte *readbuf, | |
2369 | const gdb_byte *writebuf, ULONGEST offset, | |
2370 | ULONGEST len, ULONGEST *xfered_len) | |
2371 | { | |
2372 | switch (object) | |
2373 | { | |
2374 | case TARGET_OBJECT_MEMORY: | |
2375 | return procfs_xfer_memory (readbuf, writebuf, offset, len, xfered_len); | |
2376 | ||
2377 | case TARGET_OBJECT_AUXV: | |
2378 | return memory_xfer_auxv (this, object, annex, readbuf, writebuf, | |
2379 | offset, len, xfered_len); | |
2380 | ||
2381 | default: | |
2382 | return this->beneath ()->xfer_partial (object, annex, | |
2383 | readbuf, writebuf, offset, len, | |
2384 | xfered_len); | |
2385 | } | |
2386 | } | |
2387 | ||
2388 | /* Helper for procfs_xfer_partial that handles memory transfers. | |
2389 | Arguments are like target_xfer_partial. */ | |
2390 | ||
2391 | static enum target_xfer_status | |
2392 | procfs_xfer_memory (gdb_byte *readbuf, const gdb_byte *writebuf, | |
2393 | ULONGEST memaddr, ULONGEST len, ULONGEST *xfered_len) | |
2394 | { | |
2395 | procinfo *pi; | |
2396 | int nbytes; | |
2397 | ||
2398 | /* Find procinfo for main process. */ | |
2399 | pi = find_procinfo_or_die (inferior_ptid.pid (), 0); | |
2400 | if (pi->as_fd == 0 && open_procinfo_files (pi, FD_AS) == 0) | |
2401 | { | |
2402 | proc_warn (pi, "xfer_memory, open_proc_files", __LINE__); | |
2403 | return TARGET_XFER_E_IO; | |
2404 | } | |
2405 | ||
2406 | if (lseek (pi->as_fd, (off_t) memaddr, SEEK_SET) != (off_t) memaddr) | |
2407 | return TARGET_XFER_E_IO; | |
2408 | ||
2409 | if (writebuf != NULL) | |
2410 | { | |
2411 | PROCFS_NOTE ("write memory:\n"); | |
2412 | nbytes = write (pi->as_fd, writebuf, len); | |
2413 | } | |
2414 | else | |
2415 | { | |
2416 | PROCFS_NOTE ("read memory:\n"); | |
2417 | nbytes = read (pi->as_fd, readbuf, len); | |
2418 | } | |
2419 | if (nbytes <= 0) | |
2420 | return TARGET_XFER_E_IO; | |
2421 | *xfered_len = nbytes; | |
2422 | return TARGET_XFER_OK; | |
2423 | } | |
2424 | ||
2425 | /* Called by target_resume before making child runnable. Mark cached | |
2426 | registers and status's invalid. If there are "dirty" caches that | |
2427 | need to be written back to the child process, do that. | |
2428 | ||
2429 | File descriptors are also cached. As they are a limited resource, | |
2430 | we cannot hold onto them indefinitely. However, as they are | |
2431 | expensive to open, we don't want to throw them away | |
2432 | indiscriminately either. As a compromise, we will keep the file | |
2433 | descriptors for the parent process, but discard any file | |
2434 | descriptors we may have accumulated for the threads. | |
2435 | ||
2436 | As this function is called by iterate_over_threads, it always | |
2437 | returns zero (so that iterate_over_threads will keep | |
2438 | iterating). */ | |
2439 | ||
2440 | static int | |
2441 | invalidate_cache (procinfo *parent, procinfo *pi, void *ptr) | |
2442 | { | |
2443 | /* About to run the child; invalidate caches and do any other | |
2444 | cleanup. */ | |
2445 | ||
2446 | if (parent != NULL) | |
2447 | { | |
2448 | /* The presence of a parent indicates that this is an LWP. | |
2449 | Close any file descriptors that it might have open. | |
2450 | We don't do this to the master (parent) procinfo. */ | |
2451 | ||
2452 | close_procinfo_files (pi); | |
2453 | } | |
2454 | pi->gregs_valid = 0; | |
2455 | pi->fpregs_valid = 0; | |
2456 | pi->status_valid = 0; | |
2457 | pi->threads_valid = 0; | |
2458 | ||
2459 | return 0; | |
2460 | } | |
2461 | ||
2462 | /* Make the child process runnable. Normally we will then call | |
2463 | procfs_wait and wait for it to stop again (unless gdb is async). | |
2464 | ||
2465 | If STEP is true, then arrange for the child to stop again after | |
2466 | executing a single instruction. If SIGNO is zero, then cancel any | |
2467 | pending signal; if non-zero, then arrange for the indicated signal | |
2468 | to be delivered to the child when it runs. If PID is -1, then | |
2469 | allow any child thread to run; if non-zero, then allow only the | |
2470 | indicated thread to run. (not implemented yet). */ | |
2471 | ||
2472 | void | |
2473 | procfs_target::resume (ptid_t ptid, int step, enum gdb_signal signo) | |
2474 | { | |
2475 | procinfo *pi, *thread; | |
2476 | int native_signo; | |
2477 | ||
2478 | /* FIXME: Check/reword. */ | |
2479 | ||
2480 | /* prrun.prflags |= PRCFAULT; clear current fault. | |
2481 | PRCFAULT may be replaced by a PCCFAULT call (proc_clear_current_fault) | |
2482 | This basically leaves PRSTEP and PRCSIG. | |
2483 | PRCSIG is like PCSSIG (proc_clear_current_signal). | |
2484 | So basically PR_STEP is the sole argument that must be passed | |
2485 | to proc_run_process. */ | |
2486 | ||
2487 | /* Find procinfo for main process. */ | |
2488 | pi = find_procinfo_or_die (inferior_ptid.pid (), 0); | |
2489 | ||
2490 | /* First cut: ignore pid argument. */ | |
2491 | errno = 0; | |
2492 | ||
2493 | /* Convert signal to host numbering. */ | |
2494 | if (signo == 0 || (signo == GDB_SIGNAL_STOP && pi->ignore_next_sigstop)) | |
2495 | native_signo = 0; | |
2496 | else | |
2497 | native_signo = gdb_signal_to_host (signo); | |
2498 | ||
2499 | pi->ignore_next_sigstop = 0; | |
2500 | ||
2501 | /* Running the process voids all cached registers and status. */ | |
2502 | /* Void the threads' caches first. */ | |
2503 | proc_iterate_over_threads (pi, invalidate_cache, NULL); | |
2504 | /* Void the process procinfo's caches. */ | |
2505 | invalidate_cache (NULL, pi, NULL); | |
2506 | ||
2507 | if (ptid.pid () != -1) | |
2508 | { | |
2509 | /* Resume a specific thread, presumably suppressing the | |
2510 | others. */ | |
2511 | thread = find_procinfo (ptid.pid (), ptid.lwp ()); | |
2512 | if (thread != NULL) | |
2513 | { | |
2514 | if (thread->tid != 0) | |
2515 | { | |
2516 | /* We're to resume a specific thread, and not the | |
2517 | others. Set the child process's PR_ASYNC flag. */ | |
2518 | if (!proc_set_async (pi)) | |
2519 | proc_error (pi, "target_resume, set_async", __LINE__); | |
2520 | pi = thread; /* Substitute the thread's procinfo | |
2521 | for run. */ | |
2522 | } | |
2523 | } | |
2524 | } | |
2525 | ||
2526 | if (!proc_run_process (pi, step, native_signo)) | |
2527 | { | |
2528 | if (errno == EBUSY) | |
2529 | warning (_("resume: target already running. " | |
2530 | "Pretend to resume, and hope for the best!")); | |
2531 | else | |
2532 | proc_error (pi, "target_resume", __LINE__); | |
2533 | } | |
2534 | } | |
2535 | ||
2536 | /* Set up to trace signals in the child process. */ | |
2537 | ||
2538 | void | |
2539 | procfs_target::pass_signals (gdb::array_view<const unsigned char> pass_signals) | |
2540 | { | |
2541 | sigset_t signals; | |
2542 | procinfo *pi = find_procinfo_or_die (inferior_ptid.pid (), 0); | |
2543 | int signo; | |
2544 | ||
2545 | prfillset (&signals); | |
2546 | ||
2547 | for (signo = 0; signo < NSIG; signo++) | |
2548 | { | |
2549 | int target_signo = gdb_signal_from_host (signo); | |
2550 | if (target_signo < pass_signals.size () && pass_signals[target_signo]) | |
2551 | prdelset (&signals, signo); | |
2552 | } | |
2553 | ||
2554 | if (!proc_set_traced_signals (pi, &signals)) | |
2555 | proc_error (pi, "pass_signals", __LINE__); | |
2556 | } | |
2557 | ||
2558 | /* Print status information about the child process. */ | |
2559 | ||
2560 | void | |
2561 | procfs_target::files_info () | |
2562 | { | |
2563 | struct inferior *inf = current_inferior (); | |
2564 | ||
2565 | printf_filtered (_("\tUsing the running image of %s %s via /proc.\n"), | |
2566 | inf->attach_flag? "attached": "child", | |
2567 | target_pid_to_str (inferior_ptid).c_str ()); | |
2568 | } | |
2569 | ||
2570 | /* Make it die. Wait for it to die. Clean up after it. Note: this | |
2571 | should only be applied to the real process, not to an LWP, because | |
2572 | of the check for parent-process. If we need this to work for an | |
2573 | LWP, it needs some more logic. */ | |
2574 | ||
2575 | static void | |
2576 | unconditionally_kill_inferior (procinfo *pi) | |
2577 | { | |
2578 | int parent_pid; | |
2579 | ||
2580 | parent_pid = proc_parent_pid (pi); | |
2581 | if (!proc_kill (pi, SIGKILL)) | |
2582 | proc_error (pi, "unconditionally_kill, proc_kill", __LINE__); | |
2583 | destroy_procinfo (pi); | |
2584 | ||
2585 | /* If pi is GDB's child, wait for it to die. */ | |
2586 | if (parent_pid == getpid ()) | |
2587 | /* FIXME: should we use waitpid to make sure we get the right event? | |
2588 | Should we check the returned event? */ | |
2589 | { | |
2590 | #if 0 | |
2591 | int status, ret; | |
2592 | ||
2593 | ret = waitpid (pi->pid, &status, 0); | |
2594 | #else | |
2595 | wait (NULL); | |
2596 | #endif | |
2597 | } | |
2598 | } | |
2599 | ||
2600 | /* We're done debugging it, and we want it to go away. Then we want | |
2601 | GDB to forget all about it. */ | |
2602 | ||
2603 | void | |
2604 | procfs_target::kill () | |
2605 | { | |
2606 | if (inferior_ptid != null_ptid) /* ? */ | |
2607 | { | |
2608 | /* Find procinfo for main process. */ | |
2609 | procinfo *pi = find_procinfo (inferior_ptid.pid (), 0); | |
2610 | ||
2611 | if (pi) | |
2612 | unconditionally_kill_inferior (pi); | |
2613 | target_mourn_inferior (inferior_ptid); | |
2614 | } | |
2615 | } | |
2616 | ||
2617 | /* Forget we ever debugged this thing! */ | |
2618 | ||
2619 | void | |
2620 | procfs_target::mourn_inferior () | |
2621 | { | |
2622 | procinfo *pi; | |
2623 | ||
2624 | if (inferior_ptid != null_ptid) | |
2625 | { | |
2626 | /* Find procinfo for main process. */ | |
2627 | pi = find_procinfo (inferior_ptid.pid (), 0); | |
2628 | if (pi) | |
2629 | destroy_procinfo (pi); | |
2630 | } | |
2631 | ||
2632 | generic_mourn_inferior (); | |
2633 | ||
2634 | maybe_unpush_target (); | |
2635 | } | |
2636 | ||
2637 | /* When GDB forks to create a runnable inferior process, this function | |
2638 | is called on the parent side of the fork. It's job is to do | |
2639 | whatever is necessary to make the child ready to be debugged, and | |
2640 | then wait for the child to synchronize. */ | |
2641 | ||
2642 | void | |
2643 | procfs_target::procfs_init_inferior (int pid) | |
2644 | { | |
2645 | procinfo *pi; | |
2646 | int fail; | |
2647 | int lwpid; | |
2648 | ||
2649 | pi = create_procinfo (pid, 0); | |
2650 | if (pi == NULL) | |
2651 | perror (_("procfs: out of memory in 'init_inferior'")); | |
2652 | ||
2653 | if (!open_procinfo_files (pi, FD_CTL)) | |
2654 | proc_error (pi, "init_inferior, open_proc_files", __LINE__); | |
2655 | ||
2656 | /* | |
2657 | xmalloc // done | |
2658 | open_procinfo_files // done | |
2659 | link list // done | |
2660 | prfillset (trace) | |
2661 | procfs_notice_signals | |
2662 | prfillset (fault) | |
2663 | prdelset (FLTPAGE) | |
2664 | */ | |
2665 | ||
2666 | /* If not stopped yet, wait for it to stop. */ | |
2667 | if (!(proc_flags (pi) & PR_STOPPED) && !(proc_wait_for_stop (pi))) | |
2668 | dead_procinfo (pi, "init_inferior: wait_for_stop failed", KILL); | |
2669 | ||
2670 | /* Save some of the /proc state to be restored if we detach. */ | |
2671 | /* FIXME: Why? In case another debugger was debugging it? | |
2672 | We're it's parent, for Ghu's sake! */ | |
2673 | if (!proc_get_traced_signals (pi, &pi->saved_sigset)) | |
2674 | proc_error (pi, "init_inferior, get_traced_signals", __LINE__); | |
2675 | if (!proc_get_held_signals (pi, &pi->saved_sighold)) | |
2676 | proc_error (pi, "init_inferior, get_held_signals", __LINE__); | |
2677 | if (!proc_get_traced_faults (pi, &pi->saved_fltset)) | |
2678 | proc_error (pi, "init_inferior, get_traced_faults", __LINE__); | |
2679 | if (!proc_get_traced_sysentry (pi, pi->saved_entryset)) | |
2680 | proc_error (pi, "init_inferior, get_traced_sysentry", __LINE__); | |
2681 | if (!proc_get_traced_sysexit (pi, pi->saved_exitset)) | |
2682 | proc_error (pi, "init_inferior, get_traced_sysexit", __LINE__); | |
2683 | ||
2684 | fail = procfs_debug_inferior (pi); | |
2685 | if (fail != 0) | |
2686 | proc_error (pi, "init_inferior (procfs_debug_inferior)", fail); | |
2687 | ||
2688 | /* FIXME: logically, we should really be turning OFF run-on-last-close, | |
2689 | and possibly even turning ON kill-on-last-close at this point. But | |
2690 | I can't make that change without careful testing which I don't have | |
2691 | time to do right now... */ | |
2692 | /* Turn on run-on-last-close flag so that the child | |
2693 | will die if GDB goes away for some reason. */ | |
2694 | if (!proc_set_run_on_last_close (pi)) | |
2695 | proc_error (pi, "init_inferior, set_RLC", __LINE__); | |
2696 | ||
2697 | /* We now have have access to the lwpid of the main thread/lwp. */ | |
2698 | lwpid = proc_get_current_thread (pi); | |
2699 | ||
2700 | /* Create a procinfo for the main lwp. */ | |
2701 | create_procinfo (pid, lwpid); | |
2702 | ||
2703 | /* We already have a main thread registered in the thread table at | |
2704 | this point, but it didn't have any lwp info yet. Notify the core | |
2705 | about it. This changes inferior_ptid as well. */ | |
2706 | thread_change_ptid (this, ptid_t (pid), ptid_t (pid, lwpid, 0)); | |
2707 | ||
2708 | gdb_startup_inferior (pid, START_INFERIOR_TRAPS_EXPECTED); | |
2709 | } | |
2710 | ||
2711 | /* When GDB forks to create a new process, this function is called on | |
2712 | the child side of the fork before GDB exec's the user program. Its | |
2713 | job is to make the child minimally debuggable, so that the parent | |
2714 | GDB process can connect to the child and take over. This function | |
2715 | should do only the minimum to make that possible, and to | |
2716 | synchronize with the parent process. The parent process should | |
2717 | take care of the details. */ | |
2718 | ||
2719 | static void | |
2720 | procfs_set_exec_trap (void) | |
2721 | { | |
2722 | /* This routine called on the child side (inferior side) | |
2723 | after GDB forks the inferior. It must use only local variables, | |
2724 | because it may be sharing data space with its parent. */ | |
2725 | ||
2726 | procinfo *pi; | |
2727 | sysset_t *exitset; | |
2728 | ||
2729 | pi = create_procinfo (getpid (), 0); | |
2730 | if (pi == NULL) | |
2731 | perror_with_name (_("procfs: create_procinfo failed in child.")); | |
2732 | ||
2733 | if (open_procinfo_files (pi, FD_CTL) == 0) | |
2734 | { | |
2735 | proc_warn (pi, "set_exec_trap, open_proc_files", __LINE__); | |
2736 | gdb_flush (gdb_stderr); | |
2737 | /* No need to call "dead_procinfo", because we're going to | |
2738 | exit. */ | |
2739 | _exit (127); | |
2740 | } | |
2741 | ||
2742 | exitset = XNEW (sysset_t); | |
2743 | premptyset (exitset); | |
2744 | praddset (exitset, SYS_execve); | |
2745 | ||
2746 | if (!proc_set_traced_sysexit (pi, exitset)) | |
2747 | { | |
2748 | proc_warn (pi, "set_exec_trap, set_traced_sysexit", __LINE__); | |
2749 | gdb_flush (gdb_stderr); | |
2750 | _exit (127); | |
2751 | } | |
2752 | ||
2753 | /* FIXME: should this be done in the parent instead? */ | |
2754 | /* Turn off inherit on fork flag so that all grand-children | |
2755 | of gdb start with tracing flags cleared. */ | |
2756 | if (!proc_unset_inherit_on_fork (pi)) | |
2757 | proc_warn (pi, "set_exec_trap, unset_inherit", __LINE__); | |
2758 | ||
2759 | /* Turn off run on last close flag, so that the child process | |
2760 | cannot run away just because we close our handle on it. | |
2761 | We want it to wait for the parent to attach. */ | |
2762 | if (!proc_unset_run_on_last_close (pi)) | |
2763 | proc_warn (pi, "set_exec_trap, unset_RLC", __LINE__); | |
2764 | ||
2765 | /* FIXME: No need to destroy the procinfo -- | |
2766 | we have our own address space, and we're about to do an exec! */ | |
2767 | /*destroy_procinfo (pi);*/ | |
2768 | } | |
2769 | ||
2770 | /* Dummy function to be sure fork_inferior uses fork(2) and not vfork(2). | |
2771 | This avoids a possible deadlock gdb and its vfork'ed child. */ | |
2772 | static void | |
2773 | procfs_pre_trace (void) | |
2774 | { | |
2775 | } | |
2776 | ||
2777 | /* This function is called BEFORE gdb forks the inferior process. Its | |
2778 | only real responsibility is to set things up for the fork, and tell | |
2779 | GDB which two functions to call after the fork (one for the parent, | |
2780 | and one for the child). | |
2781 | ||
2782 | This function does a complicated search for a unix shell program, | |
2783 | which it then uses to parse arguments and environment variables to | |
2784 | be sent to the child. I wonder whether this code could not be | |
2785 | abstracted out and shared with other unix targets such as | |
2786 | inf-ptrace? */ | |
2787 | ||
2788 | void | |
2789 | procfs_target::create_inferior (const char *exec_file, | |
2790 | const std::string &allargs, | |
2791 | char **env, int from_tty) | |
2792 | { | |
2793 | const char *shell_file = get_shell (); | |
2794 | char *tryname; | |
2795 | int pid; | |
2796 | ||
2797 | if (strchr (shell_file, '/') == NULL) | |
2798 | { | |
2799 | ||
2800 | /* We will be looking down the PATH to find shell_file. If we | |
2801 | just do this the normal way (via execlp, which operates by | |
2802 | attempting an exec for each element of the PATH until it | |
2803 | finds one which succeeds), then there will be an exec for | |
2804 | each failed attempt, each of which will cause a PR_SYSEXIT | |
2805 | stop, and we won't know how to distinguish the PR_SYSEXIT's | |
2806 | for these failed execs with the ones for successful execs | |
2807 | (whether the exec has succeeded is stored at that time in the | |
2808 | carry bit or some such architecture-specific and | |
2809 | non-ABI-specified place). | |
2810 | ||
2811 | So I can't think of anything better than to search the PATH | |
2812 | now. This has several disadvantages: (1) There is a race | |
2813 | condition; if we find a file now and it is deleted before we | |
2814 | exec it, we lose, even if the deletion leaves a valid file | |
2815 | further down in the PATH, (2) there is no way to know exactly | |
2816 | what an executable (in the sense of "capable of being | |
2817 | exec'd") file is. Using access() loses because it may lose | |
2818 | if the caller is the superuser; failing to use it loses if | |
2819 | there are ACLs or some such. */ | |
2820 | ||
2821 | const char *p; | |
2822 | const char *p1; | |
2823 | /* FIXME-maybe: might want "set path" command so user can change what | |
2824 | path is used from within GDB. */ | |
2825 | const char *path = getenv ("PATH"); | |
2826 | int len; | |
2827 | struct stat statbuf; | |
2828 | ||
2829 | if (path == NULL) | |
2830 | path = "/bin:/usr/bin"; | |
2831 | ||
2832 | tryname = (char *) alloca (strlen (path) + strlen (shell_file) + 2); | |
2833 | for (p = path; p != NULL; p = p1 ? p1 + 1: NULL) | |
2834 | { | |
2835 | p1 = strchr (p, ':'); | |
2836 | if (p1 != NULL) | |
2837 | len = p1 - p; | |
2838 | else | |
2839 | len = strlen (p); | |
2840 | strncpy (tryname, p, len); | |
2841 | tryname[len] = '\0'; | |
2842 | strcat (tryname, "/"); | |
2843 | strcat (tryname, shell_file); | |
2844 | if (access (tryname, X_OK) < 0) | |
2845 | continue; | |
2846 | if (stat (tryname, &statbuf) < 0) | |
2847 | continue; | |
2848 | if (!S_ISREG (statbuf.st_mode)) | |
2849 | /* We certainly need to reject directories. I'm not quite | |
2850 | as sure about FIFOs, sockets, etc., but I kind of doubt | |
2851 | that people want to exec() these things. */ | |
2852 | continue; | |
2853 | break; | |
2854 | } | |
2855 | if (p == NULL) | |
2856 | /* Not found. This must be an error rather than merely passing | |
2857 | the file to execlp(), because execlp() would try all the | |
2858 | exec()s, causing GDB to get confused. */ | |
2859 | error (_("procfs:%d -- Can't find shell %s in PATH"), | |
2860 | __LINE__, shell_file); | |
2861 | ||
2862 | shell_file = tryname; | |
2863 | } | |
2864 | ||
2865 | if (!inf->target_is_pushed (this)) | |
2866 | current_inferior ()->push_target (this); | |
2867 | ||
2868 | pid = fork_inferior (exec_file, allargs, env, procfs_set_exec_trap, | |
2869 | NULL, procfs_pre_trace, shell_file, NULL); | |
2870 | ||
2871 | /* We have something that executes now. We'll be running through | |
2872 | the shell at this point (if startup-with-shell is true), but the | |
2873 | pid shouldn't change. */ | |
2874 | thread_info *thr = add_thread_silent (this, ptid_t (pid)); | |
2875 | switch_to_thread (thr); | |
2876 | ||
2877 | procfs_init_inferior (pid); | |
2878 | } | |
2879 | ||
2880 | /* Callback for update_thread_list. Calls "add_thread". */ | |
2881 | ||
2882 | static int | |
2883 | procfs_notice_thread (procinfo *pi, procinfo *thread, void *ptr) | |
2884 | { | |
2885 | ptid_t gdb_threadid = ptid_t (pi->pid, thread->tid, 0); | |
2886 | ||
2887 | thread_info *thr = find_thread_ptid (&the_procfs_target, gdb_threadid); | |
2888 | if (thr == NULL || thr->state == THREAD_EXITED) | |
2889 | add_thread (&the_procfs_target, gdb_threadid); | |
2890 | ||
2891 | return 0; | |
2892 | } | |
2893 | ||
2894 | /* Query all the threads that the target knows about, and give them | |
2895 | back to GDB to add to its list. */ | |
2896 | ||
2897 | void | |
2898 | procfs_target::update_thread_list () | |
2899 | { | |
2900 | procinfo *pi; | |
2901 | ||
2902 | prune_threads (); | |
2903 | ||
2904 | /* Find procinfo for main process. */ | |
2905 | pi = find_procinfo_or_die (inferior_ptid.pid (), 0); | |
2906 | proc_update_threads (pi); | |
2907 | proc_iterate_over_threads (pi, procfs_notice_thread, NULL); | |
2908 | } | |
2909 | ||
2910 | /* Return true if the thread is still 'alive'. This guy doesn't | |
2911 | really seem to be doing his job. Got to investigate how to tell | |
2912 | when a thread is really gone. */ | |
2913 | ||
2914 | bool | |
2915 | procfs_target::thread_alive (ptid_t ptid) | |
2916 | { | |
2917 | int proc, thread; | |
2918 | procinfo *pi; | |
2919 | ||
2920 | proc = ptid.pid (); | |
2921 | thread = ptid.lwp (); | |
2922 | /* If I don't know it, it ain't alive! */ | |
2923 | pi = find_procinfo (proc, thread); | |
2924 | if (pi == NULL) | |
2925 | return false; | |
2926 | ||
2927 | /* If I can't get its status, it ain't alive! | |
2928 | What's more, I need to forget about it! */ | |
2929 | if (!proc_get_status (pi)) | |
2930 | { | |
2931 | destroy_procinfo (pi); | |
2932 | return false; | |
2933 | } | |
2934 | /* I couldn't have got its status if it weren't alive, so it's | |
2935 | alive. */ | |
2936 | return true; | |
2937 | } | |
2938 | ||
2939 | /* Convert PTID to a string. */ | |
2940 | ||
2941 | std::string | |
2942 | procfs_target::pid_to_str (ptid_t ptid) | |
2943 | { | |
2944 | if (ptid.lwp () == 0) | |
2945 | return string_printf ("process %d", ptid.pid ()); | |
2946 | else | |
2947 | return string_printf ("LWP %ld", ptid.lwp ()); | |
2948 | } | |
2949 | ||
2950 | /* Accepts an integer PID; Returns a string representing a file that | |
2951 | can be opened to get the symbols for the child process. */ | |
2952 | ||
2953 | char * | |
2954 | procfs_target::pid_to_exec_file (int pid) | |
2955 | { | |
2956 | static char buf[PATH_MAX]; | |
2957 | char name[PATH_MAX]; | |
2958 | ||
2959 | /* Solaris 11 introduced /proc/<proc-id>/execname. */ | |
2960 | xsnprintf (name, sizeof (name), "/proc/%d/execname", pid); | |
2961 | scoped_fd fd (gdb_open_cloexec (name, O_RDONLY, 0)); | |
2962 | if (fd.get () < 0 || read (fd.get (), buf, PATH_MAX - 1) < 0) | |
2963 | { | |
2964 | /* If that fails, fall back to /proc/<proc-id>/path/a.out introduced in | |
2965 | Solaris 10. */ | |
2966 | ssize_t len; | |
2967 | ||
2968 | xsnprintf (name, sizeof (name), "/proc/%d/path/a.out", pid); | |
2969 | len = readlink (name, buf, PATH_MAX - 1); | |
2970 | if (len <= 0) | |
2971 | strcpy (buf, name); | |
2972 | else | |
2973 | buf[len] = '\0'; | |
2974 | } | |
2975 | ||
2976 | return buf; | |
2977 | } | |
2978 | ||
2979 | /* Insert a watchpoint. */ | |
2980 | ||
2981 | static int | |
2982 | procfs_set_watchpoint (ptid_t ptid, CORE_ADDR addr, int len, int rwflag, | |
2983 | int after) | |
2984 | { | |
2985 | int pflags = 0; | |
2986 | procinfo *pi; | |
2987 | ||
2988 | pi = find_procinfo_or_die (ptid.pid () == -1 ? | |
2989 | inferior_ptid.pid () : ptid.pid (), | |
2990 | 0); | |
2991 | ||
2992 | /* Translate from GDB's flags to /proc's. */ | |
2993 | if (len > 0) /* len == 0 means delete watchpoint. */ | |
2994 | { | |
2995 | switch (rwflag) { /* FIXME: need an enum! */ | |
2996 | case hw_write: /* default watchpoint (write) */ | |
2997 | pflags = WA_WRITE; | |
2998 | break; | |
2999 | case hw_read: /* read watchpoint */ | |
3000 | pflags = WA_READ; | |
3001 | break; | |
3002 | case hw_access: /* access watchpoint */ | |
3003 | pflags = WA_READ | WA_WRITE; | |
3004 | break; | |
3005 | case hw_execute: /* execution HW breakpoint */ | |
3006 | pflags = WA_EXEC; | |
3007 | break; | |
3008 | default: /* Something weird. Return error. */ | |
3009 | return -1; | |
3010 | } | |
3011 | if (after) /* Stop after r/w access is completed. */ | |
3012 | pflags |= WA_TRAPAFTER; | |
3013 | } | |
3014 | ||
3015 | if (!proc_set_watchpoint (pi, addr, len, pflags)) | |
3016 | { | |
3017 | if (errno == E2BIG) /* Typical error for no resources. */ | |
3018 | return -1; /* fail */ | |
3019 | /* GDB may try to remove the same watchpoint twice. | |
3020 | If a remove request returns no match, don't error. */ | |
3021 | if (errno == ESRCH && len == 0) | |
3022 | return 0; /* ignore */ | |
3023 | proc_error (pi, "set_watchpoint", __LINE__); | |
3024 | } | |
3025 | return 0; | |
3026 | } | |
3027 | ||
3028 | /* Return non-zero if we can set a hardware watchpoint of type TYPE. TYPE | |
3029 | is one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, | |
3030 | or bp_hardware_watchpoint. CNT is the number of watchpoints used so | |
3031 | far. */ | |
3032 | ||
3033 | int | |
3034 | procfs_target::can_use_hw_breakpoint (enum bptype type, int cnt, int othertype) | |
3035 | { | |
3036 | /* Due to the way that proc_set_watchpoint() is implemented, host | |
3037 | and target pointers must be of the same size. If they are not, | |
3038 | we can't use hardware watchpoints. This limitation is due to the | |
3039 | fact that proc_set_watchpoint() calls | |
3040 | procfs_address_to_host_pointer(); a close inspection of | |
3041 | procfs_address_to_host_pointer will reveal that an internal error | |
3042 | will be generated when the host and target pointer sizes are | |
3043 | different. */ | |
3044 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; | |
3045 | ||
3046 | if (sizeof (void *) != TYPE_LENGTH (ptr_type)) | |
3047 | return 0; | |
3048 | ||
3049 | /* Other tests here??? */ | |
3050 | ||
3051 | return 1; | |
3052 | } | |
3053 | ||
3054 | /* Returns non-zero if process is stopped on a hardware watchpoint | |
3055 | fault, else returns zero. */ | |
3056 | ||
3057 | bool | |
3058 | procfs_target::stopped_by_watchpoint () | |
3059 | { | |
3060 | procinfo *pi; | |
3061 | ||
3062 | pi = find_procinfo_or_die (inferior_ptid.pid (), 0); | |
3063 | ||
3064 | if (proc_flags (pi) & (PR_STOPPED | PR_ISTOP)) | |
3065 | if (proc_why (pi) == PR_FAULTED) | |
3066 | if (proc_what (pi) == FLTWATCH) | |
3067 | return true; | |
3068 | return false; | |
3069 | } | |
3070 | ||
3071 | /* Returns 1 if the OS knows the position of the triggered watchpoint, | |
3072 | and sets *ADDR to that address. Returns 0 if OS cannot report that | |
3073 | address. This function is only called if | |
3074 | procfs_stopped_by_watchpoint returned 1, thus no further checks are | |
3075 | done. The function also assumes that ADDR is not NULL. */ | |
3076 | ||
3077 | bool | |
3078 | procfs_target::stopped_data_address (CORE_ADDR *addr) | |
3079 | { | |
3080 | procinfo *pi; | |
3081 | ||
3082 | pi = find_procinfo_or_die (inferior_ptid.pid (), 0); | |
3083 | return proc_watchpoint_address (pi, addr); | |
3084 | } | |
3085 | ||
3086 | int | |
3087 | procfs_target::insert_watchpoint (CORE_ADDR addr, int len, | |
3088 | enum target_hw_bp_type type, | |
3089 | struct expression *cond) | |
3090 | { | |
3091 | if (!target_have_steppable_watchpoint () | |
3092 | && !gdbarch_have_nonsteppable_watchpoint (target_gdbarch ())) | |
3093 | /* When a hardware watchpoint fires off the PC will be left at | |
3094 | the instruction following the one which caused the | |
3095 | watchpoint. It will *NOT* be necessary for GDB to step over | |
3096 | the watchpoint. */ | |
3097 | return procfs_set_watchpoint (inferior_ptid, addr, len, type, 1); | |
3098 | else | |
3099 | /* When a hardware watchpoint fires off the PC will be left at | |
3100 | the instruction which caused the watchpoint. It will be | |
3101 | necessary for GDB to step over the watchpoint. */ | |
3102 | return procfs_set_watchpoint (inferior_ptid, addr, len, type, 0); | |
3103 | } | |
3104 | ||
3105 | int | |
3106 | procfs_target::remove_watchpoint (CORE_ADDR addr, int len, | |
3107 | enum target_hw_bp_type type, | |
3108 | struct expression *cond) | |
3109 | { | |
3110 | return procfs_set_watchpoint (inferior_ptid, addr, 0, 0, 0); | |
3111 | } | |
3112 | ||
3113 | int | |
3114 | procfs_target::region_ok_for_hw_watchpoint (CORE_ADDR addr, int len) | |
3115 | { | |
3116 | /* The man page for proc(4) on Solaris 2.6 and up says that the | |
3117 | system can support "thousands" of hardware watchpoints, but gives | |
3118 | no method for finding out how many; It doesn't say anything about | |
3119 | the allowed size for the watched area either. So we just tell | |
3120 | GDB 'yes'. */ | |
3121 | return 1; | |
3122 | } | |
3123 | ||
3124 | /* Memory Mappings Functions: */ | |
3125 | ||
3126 | /* Call a callback function once for each mapping, passing it the | |
3127 | mapping, an optional secondary callback function, and some optional | |
3128 | opaque data. Quit and return the first non-zero value returned | |
3129 | from the callback. | |
3130 | ||
3131 | PI is the procinfo struct for the process to be mapped. FUNC is | |
3132 | the callback function to be called by this iterator. DATA is the | |
3133 | optional opaque data to be passed to the callback function. | |
3134 | CHILD_FUNC is the optional secondary function pointer to be passed | |
3135 | to the child function. Returns the first non-zero return value | |
3136 | from the callback function, or zero. */ | |
3137 | ||
3138 | static int | |
3139 | iterate_over_mappings (procinfo *pi, find_memory_region_ftype child_func, | |
3140 | void *data, | |
3141 | int (*func) (struct prmap *map, | |
3142 | find_memory_region_ftype child_func, | |
3143 | void *data)) | |
3144 | { | |
3145 | char pathname[MAX_PROC_NAME_SIZE]; | |
3146 | struct prmap *prmaps; | |
3147 | struct prmap *prmap; | |
3148 | int funcstat; | |
3149 | int nmap; | |
3150 | struct stat sbuf; | |
3151 | ||
3152 | /* Get the number of mappings, allocate space, | |
3153 | and read the mappings into prmaps. */ | |
3154 | /* Open map fd. */ | |
3155 | xsnprintf (pathname, sizeof (pathname), "/proc/%d/map", pi->pid); | |
3156 | ||
3157 | scoped_fd map_fd (open (pathname, O_RDONLY)); | |
3158 | if (map_fd.get () < 0) | |
3159 | proc_error (pi, "iterate_over_mappings (open)", __LINE__); | |
3160 | ||
3161 | /* Use stat to determine the file size, and compute | |
3162 | the number of prmap_t objects it contains. */ | |
3163 | if (fstat (map_fd.get (), &sbuf) != 0) | |
3164 | proc_error (pi, "iterate_over_mappings (fstat)", __LINE__); | |
3165 | ||
3166 | nmap = sbuf.st_size / sizeof (prmap_t); | |
3167 | prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps)); | |
3168 | if (read (map_fd.get (), (char *) prmaps, nmap * sizeof (*prmaps)) | |
3169 | != (nmap * sizeof (*prmaps))) | |
3170 | proc_error (pi, "iterate_over_mappings (read)", __LINE__); | |
3171 | ||
3172 | for (prmap = prmaps; nmap > 0; prmap++, nmap--) | |
3173 | { | |
3174 | funcstat = (*func) (prmap, child_func, data); | |
3175 | if (funcstat != 0) | |
3176 | return funcstat; | |
3177 | } | |
3178 | ||
3179 | return 0; | |
3180 | } | |
3181 | ||
3182 | /* Implements the to_find_memory_regions method. Calls an external | |
3183 | function for each memory region. | |
3184 | Returns the integer value returned by the callback. */ | |
3185 | ||
3186 | static int | |
3187 | find_memory_regions_callback (struct prmap *map, | |
3188 | find_memory_region_ftype func, void *data) | |
3189 | { | |
3190 | return (*func) ((CORE_ADDR) map->pr_vaddr, | |
3191 | map->pr_size, | |
3192 | (map->pr_mflags & MA_READ) != 0, | |
3193 | (map->pr_mflags & MA_WRITE) != 0, | |
3194 | (map->pr_mflags & MA_EXEC) != 0, | |
3195 | 1, /* MODIFIED is unknown, pass it as true. */ | |
3196 | data); | |
3197 | } | |
3198 | ||
3199 | /* External interface. Calls a callback function once for each | |
3200 | mapped memory region in the child process, passing as arguments: | |
3201 | ||
3202 | CORE_ADDR virtual_address, | |
3203 | unsigned long size, | |
3204 | int read, TRUE if region is readable by the child | |
3205 | int write, TRUE if region is writable by the child | |
3206 | int execute TRUE if region is executable by the child. | |
3207 | ||
3208 | Stops iterating and returns the first non-zero value returned by | |
3209 | the callback. */ | |
3210 | ||
3211 | int | |
3212 | procfs_target::find_memory_regions (find_memory_region_ftype func, void *data) | |
3213 | { | |
3214 | procinfo *pi = find_procinfo_or_die (inferior_ptid.pid (), 0); | |
3215 | ||
3216 | return iterate_over_mappings (pi, func, data, | |
3217 | find_memory_regions_callback); | |
3218 | } | |
3219 | ||
3220 | /* Returns an ascii representation of a memory mapping's flags. */ | |
3221 | ||
3222 | static char * | |
3223 | mappingflags (long flags) | |
3224 | { | |
3225 | static char asciiflags[8]; | |
3226 | ||
3227 | strcpy (asciiflags, "-------"); | |
3228 | if (flags & MA_STACK) | |
3229 | asciiflags[1] = 's'; | |
3230 | if (flags & MA_BREAK) | |
3231 | asciiflags[2] = 'b'; | |
3232 | if (flags & MA_SHARED) | |
3233 | asciiflags[3] = 's'; | |
3234 | if (flags & MA_READ) | |
3235 | asciiflags[4] = 'r'; | |
3236 | if (flags & MA_WRITE) | |
3237 | asciiflags[5] = 'w'; | |
3238 | if (flags & MA_EXEC) | |
3239 | asciiflags[6] = 'x'; | |
3240 | return (asciiflags); | |
3241 | } | |
3242 | ||
3243 | /* Callback function, does the actual work for 'info proc | |
3244 | mappings'. */ | |
3245 | ||
3246 | static int | |
3247 | info_mappings_callback (struct prmap *map, find_memory_region_ftype ignore, | |
3248 | void *unused) | |
3249 | { | |
3250 | unsigned int pr_off; | |
3251 | ||
3252 | pr_off = (unsigned int) map->pr_offset; | |
3253 | ||
3254 | if (gdbarch_addr_bit (target_gdbarch ()) == 32) | |
3255 | printf_filtered ("\t%#10lx %#10lx %#10lx %#10x %7s\n", | |
3256 | (unsigned long) map->pr_vaddr, | |
3257 | (unsigned long) map->pr_vaddr + map->pr_size - 1, | |
3258 | (unsigned long) map->pr_size, | |
3259 | pr_off, | |
3260 | mappingflags (map->pr_mflags)); | |
3261 | else | |
3262 | printf_filtered (" %#18lx %#18lx %#10lx %#10x %7s\n", | |
3263 | (unsigned long) map->pr_vaddr, | |
3264 | (unsigned long) map->pr_vaddr + map->pr_size - 1, | |
3265 | (unsigned long) map->pr_size, | |
3266 | pr_off, | |
3267 | mappingflags (map->pr_mflags)); | |
3268 | ||
3269 | return 0; | |
3270 | } | |
3271 | ||
3272 | /* Implement the "info proc mappings" subcommand. */ | |
3273 | ||
3274 | static void | |
3275 | info_proc_mappings (procinfo *pi, int summary) | |
3276 | { | |
3277 | if (summary) | |
3278 | return; /* No output for summary mode. */ | |
3279 | ||
3280 | printf_filtered (_("Mapped address spaces:\n\n")); | |
3281 | if (gdbarch_ptr_bit (target_gdbarch ()) == 32) | |
3282 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
3283 | "Start Addr", | |
3284 | " End Addr", | |
3285 | " Size", | |
3286 | " Offset", | |
3287 | "Flags"); | |
3288 | else | |
3289 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
3290 | "Start Addr", | |
3291 | " End Addr", | |
3292 | " Size", | |
3293 | " Offset", | |
3294 | "Flags"); | |
3295 | ||
3296 | iterate_over_mappings (pi, NULL, NULL, info_mappings_callback); | |
3297 | printf_filtered ("\n"); | |
3298 | } | |
3299 | ||
3300 | /* Implement the "info proc" command. */ | |
3301 | ||
3302 | bool | |
3303 | procfs_target::info_proc (const char *args, enum info_proc_what what) | |
3304 | { | |
3305 | procinfo *process = NULL; | |
3306 | procinfo *thread = NULL; | |
3307 | char *tmp = NULL; | |
3308 | int pid = 0; | |
3309 | int tid = 0; | |
3310 | int mappings = 0; | |
3311 | ||
3312 | switch (what) | |
3313 | { | |
3314 | case IP_MINIMAL: | |
3315 | break; | |
3316 | ||
3317 | case IP_MAPPINGS: | |
3318 | case IP_ALL: | |
3319 | mappings = 1; | |
3320 | break; | |
3321 | ||
3322 | default: | |
3323 | error (_("Not supported on this target.")); | |
3324 | } | |
3325 | ||
3326 | gdb_argv built_argv (args); | |
3327 | for (char *arg : built_argv) | |
3328 | { | |
3329 | if (isdigit (arg[0])) | |
3330 | { | |
3331 | pid = strtoul (arg, &tmp, 10); | |
3332 | if (*tmp == '/') | |
3333 | tid = strtoul (++tmp, NULL, 10); | |
3334 | } | |
3335 | else if (arg[0] == '/') | |
3336 | { | |
3337 | tid = strtoul (arg + 1, NULL, 10); | |
3338 | } | |
3339 | } | |
3340 | ||
3341 | procinfo_up temporary_procinfo; | |
3342 | if (pid == 0) | |
3343 | pid = inferior_ptid.pid (); | |
3344 | if (pid == 0) | |
3345 | error (_("No current process: you must name one.")); | |
3346 | else | |
3347 | { | |
3348 | /* Have pid, will travel. | |
3349 | First see if it's a process we're already debugging. */ | |
3350 | process = find_procinfo (pid, 0); | |
3351 | if (process == NULL) | |
3352 | { | |
3353 | /* No. So open a procinfo for it, but | |
3354 | remember to close it again when finished. */ | |
3355 | process = create_procinfo (pid, 0); | |
3356 | temporary_procinfo.reset (process); | |
3357 | if (!open_procinfo_files (process, FD_CTL)) | |
3358 | proc_error (process, "info proc, open_procinfo_files", __LINE__); | |
3359 | } | |
3360 | } | |
3361 | if (tid != 0) | |
3362 | thread = create_procinfo (pid, tid); | |
3363 | ||
3364 | if (process) | |
3365 | { | |
3366 | printf_filtered (_("process %d flags:\n"), process->pid); | |
3367 | proc_prettyprint_flags (proc_flags (process), 1); | |
3368 | if (proc_flags (process) & (PR_STOPPED | PR_ISTOP)) | |
3369 | proc_prettyprint_why (proc_why (process), proc_what (process), 1); | |
3370 | if (proc_get_nthreads (process) > 1) | |
3371 | printf_filtered ("Process has %d threads.\n", | |
3372 | proc_get_nthreads (process)); | |
3373 | } | |
3374 | if (thread) | |
3375 | { | |
3376 | printf_filtered (_("thread %d flags:\n"), thread->tid); | |
3377 | proc_prettyprint_flags (proc_flags (thread), 1); | |
3378 | if (proc_flags (thread) & (PR_STOPPED | PR_ISTOP)) | |
3379 | proc_prettyprint_why (proc_why (thread), proc_what (thread), 1); | |
3380 | } | |
3381 | ||
3382 | if (mappings) | |
3383 | info_proc_mappings (process, 0); | |
3384 | ||
3385 | return true; | |
3386 | } | |
3387 | ||
3388 | /* Modify the status of the system call identified by SYSCALLNUM in | |
3389 | the set of syscalls that are currently traced/debugged. | |
3390 | ||
3391 | If ENTRY_OR_EXIT is set to PR_SYSENTRY, then the entry syscalls set | |
3392 | will be updated. Otherwise, the exit syscalls set will be updated. | |
3393 | ||
3394 | If MODE is FLAG_SET, then traces will be enabled. Otherwise, they | |
3395 | will be disabled. */ | |
3396 | ||
3397 | static void | |
3398 | proc_trace_syscalls_1 (procinfo *pi, int syscallnum, int entry_or_exit, | |
3399 | int mode, int from_tty) | |
3400 | { | |
3401 | sysset_t *sysset; | |
3402 | ||
3403 | if (entry_or_exit == PR_SYSENTRY) | |
3404 | sysset = proc_get_traced_sysentry (pi, NULL); | |
3405 | else | |
3406 | sysset = proc_get_traced_sysexit (pi, NULL); | |
3407 | ||
3408 | if (sysset == NULL) | |
3409 | proc_error (pi, "proc-trace, get_traced_sysset", __LINE__); | |
3410 | ||
3411 | if (mode == FLAG_SET) | |
3412 | praddset (sysset, syscallnum); | |
3413 | else | |
3414 | prdelset (sysset, syscallnum); | |
3415 | ||
3416 | if (entry_or_exit == PR_SYSENTRY) | |
3417 | { | |
3418 | if (!proc_set_traced_sysentry (pi, sysset)) | |
3419 | proc_error (pi, "proc-trace, set_traced_sysentry", __LINE__); | |
3420 | } | |
3421 | else | |
3422 | { | |
3423 | if (!proc_set_traced_sysexit (pi, sysset)) | |
3424 | proc_error (pi, "proc-trace, set_traced_sysexit", __LINE__); | |
3425 | } | |
3426 | } | |
3427 | ||
3428 | static void | |
3429 | proc_trace_syscalls (const char *args, int from_tty, int entry_or_exit, int mode) | |
3430 | { | |
3431 | procinfo *pi; | |
3432 | ||
3433 | if (inferior_ptid.pid () <= 0) | |
3434 | error (_("you must be debugging a process to use this command.")); | |
3435 | ||
3436 | if (args == NULL || args[0] == 0) | |
3437 | error_no_arg (_("system call to trace")); | |
3438 | ||
3439 | pi = find_procinfo_or_die (inferior_ptid.pid (), 0); | |
3440 | if (isdigit (args[0])) | |
3441 | { | |
3442 | const int syscallnum = atoi (args); | |
3443 | ||
3444 | proc_trace_syscalls_1 (pi, syscallnum, entry_or_exit, mode, from_tty); | |
3445 | } | |
3446 | } | |
3447 | ||
3448 | static void | |
3449 | proc_trace_sysentry_cmd (const char *args, int from_tty) | |
3450 | { | |
3451 | proc_trace_syscalls (args, from_tty, PR_SYSENTRY, FLAG_SET); | |
3452 | } | |
3453 | ||
3454 | static void | |
3455 | proc_trace_sysexit_cmd (const char *args, int from_tty) | |
3456 | { | |
3457 | proc_trace_syscalls (args, from_tty, PR_SYSEXIT, FLAG_SET); | |
3458 | } | |
3459 | ||
3460 | static void | |
3461 | proc_untrace_sysentry_cmd (const char *args, int from_tty) | |
3462 | { | |
3463 | proc_trace_syscalls (args, from_tty, PR_SYSENTRY, FLAG_RESET); | |
3464 | } | |
3465 | ||
3466 | static void | |
3467 | proc_untrace_sysexit_cmd (const char *args, int from_tty) | |
3468 | { | |
3469 | proc_trace_syscalls (args, from_tty, PR_SYSEXIT, FLAG_RESET); | |
3470 | } | |
3471 | ||
3472 | void _initialize_procfs (); | |
3473 | void | |
3474 | _initialize_procfs () | |
3475 | { | |
3476 | add_com ("proc-trace-entry", no_class, proc_trace_sysentry_cmd, | |
3477 | _("Give a trace of entries into the syscall.")); | |
3478 | add_com ("proc-trace-exit", no_class, proc_trace_sysexit_cmd, | |
3479 | _("Give a trace of exits from the syscall.")); | |
3480 | add_com ("proc-untrace-entry", no_class, proc_untrace_sysentry_cmd, | |
3481 | _("Cancel a trace of entries into the syscall.")); | |
3482 | add_com ("proc-untrace-exit", no_class, proc_untrace_sysexit_cmd, | |
3483 | _("Cancel a trace of exits from the syscall.")); | |
3484 | ||
3485 | add_inf_child_target (&the_procfs_target); | |
3486 | } | |
3487 | ||
3488 | /* =================== END, GDB "MODULE" =================== */ | |
3489 | ||
3490 | ||
3491 | ||
3492 | /* miscellaneous stubs: */ | |
3493 | ||
3494 | /* The following satisfy a few random symbols mostly created by the | |
3495 | solaris threads implementation, which I will chase down later. */ | |
3496 | ||
3497 | /* Return a pid for which we guarantee we will be able to find a | |
3498 | 'live' procinfo. */ | |
3499 | ||
3500 | ptid_t | |
3501 | procfs_first_available (void) | |
3502 | { | |
3503 | return ptid_t (procinfo_list ? procinfo_list->pid : -1); | |
3504 | } | |
3505 | ||
3506 | /* =================== GCORE .NOTE "MODULE" =================== */ | |
3507 | ||
3508 | static void | |
3509 | procfs_do_thread_registers (bfd *obfd, ptid_t ptid, | |
3510 | gdb::unique_xmalloc_ptr<char> ¬e_data, | |
3511 | int *note_size, enum gdb_signal stop_signal) | |
3512 | { | |
3513 | struct regcache *regcache = get_thread_regcache (&the_procfs_target, ptid); | |
3514 | gdb_gregset_t gregs; | |
3515 | gdb_fpregset_t fpregs; | |
3516 | unsigned long merged_pid; | |
3517 | ||
3518 | merged_pid = ptid.lwp () << 16 | ptid.pid (); | |
3519 | ||
3520 | /* This part is the old method for fetching registers. | |
3521 | It should be replaced by the newer one using regsets | |
3522 | once it is implemented in this platform: | |
3523 | gdbarch_iterate_over_regset_sections(). */ | |
3524 | ||
3525 | target_fetch_registers (regcache, -1); | |
3526 | ||
3527 | fill_gregset (regcache, &gregs, -1); | |
3528 | note_data.reset (elfcore_write_lwpstatus (obfd, | |
3529 | note_data.release (), | |
3530 | note_size, | |
3531 | merged_pid, | |
3532 | stop_signal, | |
3533 | &gregs)); | |
3534 | fill_fpregset (regcache, &fpregs, -1); | |
3535 | note_data.reset (elfcore_write_prfpreg (obfd, | |
3536 | note_data.release (), | |
3537 | note_size, | |
3538 | &fpregs, | |
3539 | sizeof (fpregs))); | |
3540 | } | |
3541 | ||
3542 | struct procfs_corefile_thread_data | |
3543 | { | |
3544 | procfs_corefile_thread_data (bfd *obfd, | |
3545 | gdb::unique_xmalloc_ptr<char> ¬e_data, | |
3546 | int *note_size, gdb_signal stop_signal) | |
3547 | : obfd (obfd), note_data (note_data), note_size (note_size), | |
3548 | stop_signal (stop_signal) | |
3549 | {} | |
3550 | ||
3551 | bfd *obfd; | |
3552 | gdb::unique_xmalloc_ptr<char> ¬e_data; | |
3553 | int *note_size; | |
3554 | enum gdb_signal stop_signal; | |
3555 | }; | |
3556 | ||
3557 | static int | |
3558 | procfs_corefile_thread_callback (procinfo *pi, procinfo *thread, void *data) | |
3559 | { | |
3560 | struct procfs_corefile_thread_data *args | |
3561 | = (struct procfs_corefile_thread_data *) data; | |
3562 | ||
3563 | if (pi != NULL) | |
3564 | { | |
3565 | ptid_t ptid = ptid_t (pi->pid, thread->tid, 0); | |
3566 | ||
3567 | procfs_do_thread_registers (args->obfd, ptid, | |
3568 | args->note_data, | |
3569 | args->note_size, | |
3570 | args->stop_signal); | |
3571 | } | |
3572 | return 0; | |
3573 | } | |
3574 | ||
3575 | static int | |
3576 | find_signalled_thread (struct thread_info *info, void *data) | |
3577 | { | |
3578 | if (info->suspend.stop_signal != GDB_SIGNAL_0 | |
3579 | && info->ptid.pid () == inferior_ptid.pid ()) | |
3580 | return 1; | |
3581 | ||
3582 | return 0; | |
3583 | } | |
3584 | ||
3585 | static enum gdb_signal | |
3586 | find_stop_signal (void) | |
3587 | { | |
3588 | struct thread_info *info = | |
3589 | iterate_over_threads (find_signalled_thread, NULL); | |
3590 | ||
3591 | if (info) | |
3592 | return info->suspend.stop_signal; | |
3593 | else | |
3594 | return GDB_SIGNAL_0; | |
3595 | } | |
3596 | ||
3597 | gdb::unique_xmalloc_ptr<char> | |
3598 | procfs_target::make_corefile_notes (bfd *obfd, int *note_size) | |
3599 | { | |
3600 | gdb_gregset_t gregs; | |
3601 | char fname[16] = {'\0'}; | |
3602 | char psargs[80] = {'\0'}; | |
3603 | procinfo *pi = find_procinfo_or_die (inferior_ptid.pid (), 0); | |
3604 | gdb::unique_xmalloc_ptr<char> note_data; | |
3605 | const char *inf_args; | |
3606 | enum gdb_signal stop_signal; | |
3607 | ||
3608 | if (get_exec_file (0)) | |
3609 | { | |
3610 | strncpy (fname, lbasename (get_exec_file (0)), sizeof (fname)); | |
3611 | fname[sizeof (fname) - 1] = 0; | |
3612 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); | |
3613 | psargs[sizeof (psargs) - 1] = 0; | |
3614 | ||
3615 | inf_args = get_inferior_args (); | |
3616 | if (inf_args && *inf_args | |
3617 | && (strlen (inf_args) | |
3618 | < ((int) sizeof (psargs) - (int) strlen (psargs)))) | |
3619 | { | |
3620 | strncat (psargs, " ", | |
3621 | sizeof (psargs) - strlen (psargs)); | |
3622 | strncat (psargs, inf_args, | |
3623 | sizeof (psargs) - strlen (psargs)); | |
3624 | } | |
3625 | } | |
3626 | ||
3627 | note_data.reset (elfcore_write_prpsinfo (obfd, | |
3628 | note_data.release (), | |
3629 | note_size, | |
3630 | fname, | |
3631 | psargs)); | |
3632 | ||
3633 | stop_signal = find_stop_signal (); | |
3634 | ||
3635 | fill_gregset (get_current_regcache (), &gregs, -1); | |
3636 | note_data.reset (elfcore_write_pstatus (obfd, note_data.release (), note_size, | |
3637 | inferior_ptid.pid (), | |
3638 | stop_signal, &gregs)); | |
3639 | ||
3640 | procfs_corefile_thread_data thread_args (obfd, note_data, note_size, | |
3641 | stop_signal); | |
3642 | proc_iterate_over_threads (pi, procfs_corefile_thread_callback, | |
3643 | &thread_args); | |
3644 | ||
3645 | gdb::optional<gdb::byte_vector> auxv = | |
3646 | target_read_alloc (current_inferior ()->top_target (), | |
3647 | TARGET_OBJECT_AUXV, NULL); | |
3648 | if (auxv && !auxv->empty ()) | |
3649 | note_data.reset (elfcore_write_note (obfd, note_data.release (), note_size, | |
3650 | "CORE", NT_AUXV, auxv->data (), | |
3651 | auxv->size ())); | |
3652 | ||
3653 | return note_data; | |
3654 | } | |
3655 | /* =================== END GCORE .NOTE "MODULE" =================== */ |