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5bf970f9 AC |
1 | /* Default child (native) target interface, for GDB when running under |
2 | Unix. | |
3 | ||
0b302171 JB |
4 | Copyright (C) 1988-1996, 1998-2002, 2004-2005, 2007-2012 Free |
5 | Software Foundation, Inc. | |
5bf970f9 AC |
6 | |
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
5bf970f9 AC |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
5bf970f9 AC |
21 | |
22 | #include "defs.h" | |
23 | #include "regcache.h" | |
24 | #include "memattr.h" | |
25 | #include "symtab.h" | |
26 | #include "target.h" | |
27 | #include "inferior.h" | |
7681f339 | 28 | #include "gdb_string.h" |
a71b5a38 | 29 | #include "gdb_stat.h" |
2c0b251b | 30 | #include "inf-child.h" |
7313baad UW |
31 | #include "gdb/fileio.h" |
32 | ||
b9e7b9c3 UW |
33 | #ifdef HAVE_SYS_PARAM_H |
34 | #include <sys/param.h> /* for MAXPATHLEN */ | |
35 | #endif | |
7313baad | 36 | #include <sys/types.h> |
7313baad UW |
37 | #include <fcntl.h> |
38 | #include <unistd.h> | |
5bf970f9 AC |
39 | |
40 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
41 | for all registers. */ | |
42 | ||
43 | static void | |
28439f5e PA |
44 | inf_child_fetch_inferior_registers (struct target_ops *ops, |
45 | struct regcache *regcache, int regnum) | |
5bf970f9 AC |
46 | { |
47 | if (regnum == -1) | |
48 | { | |
b1a653ae UW |
49 | for (regnum = 0; |
50 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
51 | regnum++) | |
56be3814 | 52 | regcache_raw_supply (regcache, regnum, NULL); |
5bf970f9 AC |
53 | } |
54 | else | |
56be3814 | 55 | regcache_raw_supply (regcache, regnum, NULL); |
5bf970f9 AC |
56 | } |
57 | ||
58 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
59 | this for all registers (including the floating point registers). */ | |
60 | ||
61 | static void | |
28439f5e PA |
62 | inf_child_store_inferior_registers (struct target_ops *ops, |
63 | struct regcache *regcache, int regnum) | |
5bf970f9 AC |
64 | { |
65 | } | |
66 | ||
5bf970f9 AC |
67 | static void |
68 | inf_child_post_attach (int pid) | |
69 | { | |
70 | /* This version of Unix doesn't require a meaningful "post attach" | |
71 | operation by a debugger. */ | |
72 | } | |
73 | ||
74 | /* Get ready to modify the registers array. On machines which store | |
75 | individual registers, this doesn't need to do anything. On | |
76 | machines which store all the registers in one fell swoop, this | |
77 | makes sure that registers contains all the registers from the | |
78 | program being debugged. */ | |
79 | ||
80 | static void | |
316f2060 | 81 | inf_child_prepare_to_store (struct regcache *regcache) |
5bf970f9 AC |
82 | { |
83 | } | |
84 | ||
85 | static void | |
86 | inf_child_open (char *arg, int from_tty) | |
87 | { | |
8a3fe4f8 | 88 | error (_("Use the \"run\" command to start a Unix child process.")); |
5bf970f9 AC |
89 | } |
90 | ||
91 | static void | |
92 | inf_child_post_startup_inferior (ptid_t ptid) | |
93 | { | |
94 | /* This version of Unix doesn't require a meaningful "post startup | |
95 | inferior" operation by a debugger. */ | |
96 | } | |
97 | ||
5bf970f9 | 98 | static int |
ee057212 | 99 | inf_child_follow_fork (struct target_ops *ops, int follow_child) |
5bf970f9 AC |
100 | { |
101 | /* This version of Unix doesn't support following fork or vfork | |
102 | events. */ | |
103 | return 0; | |
104 | } | |
105 | ||
5bf970f9 AC |
106 | static int |
107 | inf_child_can_run (void) | |
108 | { | |
109 | return 1; | |
110 | } | |
111 | ||
5bf970f9 AC |
112 | static char * |
113 | inf_child_pid_to_exec_file (int pid) | |
114 | { | |
115 | /* This version of Unix doesn't support translation of a process ID | |
116 | to the filename of the executable file. */ | |
117 | return NULL; | |
118 | } | |
119 | ||
7313baad UW |
120 | |
121 | /* Target file operations. */ | |
122 | ||
123 | static int | |
124 | inf_child_fileio_open_flags_to_host (int fileio_open_flags, int *open_flags_p) | |
125 | { | |
126 | int open_flags = 0; | |
127 | ||
128 | if (fileio_open_flags & ~FILEIO_O_SUPPORTED) | |
129 | return -1; | |
130 | ||
131 | if (fileio_open_flags & FILEIO_O_CREAT) | |
132 | open_flags |= O_CREAT; | |
133 | if (fileio_open_flags & FILEIO_O_EXCL) | |
134 | open_flags |= O_EXCL; | |
135 | if (fileio_open_flags & FILEIO_O_TRUNC) | |
136 | open_flags |= O_TRUNC; | |
137 | if (fileio_open_flags & FILEIO_O_APPEND) | |
138 | open_flags |= O_APPEND; | |
139 | if (fileio_open_flags & FILEIO_O_RDONLY) | |
140 | open_flags |= O_RDONLY; | |
141 | if (fileio_open_flags & FILEIO_O_WRONLY) | |
142 | open_flags |= O_WRONLY; | |
143 | if (fileio_open_flags & FILEIO_O_RDWR) | |
144 | open_flags |= O_RDWR; | |
145 | /* On systems supporting binary and text mode, always open files in | |
146 | binary mode. */ | |
147 | #ifdef O_BINARY | |
148 | open_flags |= O_BINARY; | |
149 | #endif | |
150 | ||
151 | *open_flags_p = open_flags; | |
152 | return 0; | |
153 | } | |
154 | ||
155 | static int | |
156 | inf_child_errno_to_fileio_error (int errnum) | |
157 | { | |
158 | switch (errnum) | |
159 | { | |
160 | case EPERM: | |
161 | return FILEIO_EPERM; | |
162 | case ENOENT: | |
163 | return FILEIO_ENOENT; | |
164 | case EINTR: | |
165 | return FILEIO_EINTR; | |
166 | case EIO: | |
167 | return FILEIO_EIO; | |
168 | case EBADF: | |
169 | return FILEIO_EBADF; | |
170 | case EACCES: | |
171 | return FILEIO_EACCES; | |
172 | case EFAULT: | |
173 | return FILEIO_EFAULT; | |
174 | case EBUSY: | |
175 | return FILEIO_EBUSY; | |
176 | case EEXIST: | |
177 | return FILEIO_EEXIST; | |
178 | case ENODEV: | |
179 | return FILEIO_ENODEV; | |
180 | case ENOTDIR: | |
181 | return FILEIO_ENOTDIR; | |
182 | case EISDIR: | |
183 | return FILEIO_EISDIR; | |
184 | case EINVAL: | |
185 | return FILEIO_EINVAL; | |
186 | case ENFILE: | |
187 | return FILEIO_ENFILE; | |
188 | case EMFILE: | |
189 | return FILEIO_EMFILE; | |
190 | case EFBIG: | |
191 | return FILEIO_EFBIG; | |
192 | case ENOSPC: | |
193 | return FILEIO_ENOSPC; | |
194 | case ESPIPE: | |
195 | return FILEIO_ESPIPE; | |
196 | case EROFS: | |
197 | return FILEIO_EROFS; | |
198 | case ENOSYS: | |
199 | return FILEIO_ENOSYS; | |
200 | case ENAMETOOLONG: | |
201 | return FILEIO_ENAMETOOLONG; | |
202 | } | |
203 | return FILEIO_EUNKNOWN; | |
204 | } | |
205 | ||
206 | /* Open FILENAME on the target, using FLAGS and MODE. Return a | |
207 | target file descriptor, or -1 if an error occurs (and set | |
208 | *TARGET_ERRNO). */ | |
209 | static int | |
210 | inf_child_fileio_open (const char *filename, int flags, int mode, | |
211 | int *target_errno) | |
212 | { | |
213 | int nat_flags; | |
214 | int fd; | |
215 | ||
216 | if (inf_child_fileio_open_flags_to_host (flags, &nat_flags) == -1) | |
217 | { | |
218 | *target_errno = FILEIO_EINVAL; | |
219 | return -1; | |
220 | } | |
221 | ||
222 | /* We do not need to convert MODE, since the fileio protocol uses | |
223 | the standard values. */ | |
224 | fd = open (filename, nat_flags, mode); | |
225 | if (fd == -1) | |
226 | *target_errno = inf_child_errno_to_fileio_error (errno); | |
227 | ||
228 | return fd; | |
229 | } | |
230 | ||
231 | /* Write up to LEN bytes from WRITE_BUF to FD on the target. | |
232 | Return the number of bytes written, or -1 if an error occurs | |
233 | (and set *TARGET_ERRNO). */ | |
234 | static int | |
235 | inf_child_fileio_pwrite (int fd, const gdb_byte *write_buf, int len, | |
236 | ULONGEST offset, int *target_errno) | |
237 | { | |
238 | int ret; | |
239 | ||
240 | #ifdef HAVE_PWRITE | |
241 | ret = pwrite (fd, write_buf, len, (long) offset); | |
242 | #else | |
243 | ret = lseek (fd, (long) offset, SEEK_SET); | |
244 | if (ret != -1) | |
245 | ret = write (fd, write_buf, len); | |
246 | #endif | |
247 | ||
248 | if (ret == -1) | |
249 | *target_errno = inf_child_errno_to_fileio_error (errno); | |
250 | ||
251 | return ret; | |
252 | } | |
253 | ||
254 | /* Read up to LEN bytes FD on the target into READ_BUF. | |
255 | Return the number of bytes read, or -1 if an error occurs | |
256 | (and set *TARGET_ERRNO). */ | |
257 | static int | |
258 | inf_child_fileio_pread (int fd, gdb_byte *read_buf, int len, | |
259 | ULONGEST offset, int *target_errno) | |
260 | { | |
261 | int ret; | |
262 | ||
263 | #ifdef HAVE_PREAD | |
264 | ret = pread (fd, read_buf, len, (long) offset); | |
265 | #else | |
266 | ret = lseek (fd, (long) offset, SEEK_SET); | |
267 | if (ret != -1) | |
268 | ret = read (fd, read_buf, len); | |
269 | #endif | |
270 | ||
271 | if (ret == -1) | |
272 | *target_errno = inf_child_errno_to_fileio_error (errno); | |
273 | ||
274 | return ret; | |
275 | } | |
276 | ||
277 | /* Close FD on the target. Return 0, or -1 if an error occurs | |
278 | (and set *TARGET_ERRNO). */ | |
279 | static int | |
280 | inf_child_fileio_close (int fd, int *target_errno) | |
281 | { | |
282 | int ret; | |
283 | ||
284 | ret = close (fd); | |
285 | if (ret == -1) | |
286 | *target_errno = inf_child_errno_to_fileio_error (errno); | |
287 | ||
288 | return ret; | |
289 | } | |
290 | ||
291 | /* Unlink FILENAME on the target. Return 0, or -1 if an error | |
292 | occurs (and set *TARGET_ERRNO). */ | |
293 | static int | |
294 | inf_child_fileio_unlink (const char *filename, int *target_errno) | |
295 | { | |
296 | int ret; | |
297 | ||
298 | ret = unlink (filename); | |
299 | if (ret == -1) | |
300 | *target_errno = inf_child_errno_to_fileio_error (errno); | |
301 | ||
302 | return ret; | |
303 | } | |
304 | ||
b9e7b9c3 UW |
305 | /* Read value of symbolic link FILENAME on the target. Return a |
306 | null-terminated string allocated via xmalloc, or NULL if an error | |
307 | occurs (and set *TARGET_ERRNO). */ | |
308 | static char * | |
309 | inf_child_fileio_readlink (const char *filename, int *target_errno) | |
310 | { | |
311 | /* We support readlink only on systems that also provide a compile-time | |
312 | maximum path length (MAXPATHLEN), at least for now. */ | |
313 | #if defined (HAVE_READLINK) && defined (MAXPATHLEN) | |
314 | char buf[MAXPATHLEN]; | |
315 | int len; | |
316 | char *ret; | |
317 | ||
318 | len = readlink (filename, buf, sizeof buf); | |
319 | if (len < 0) | |
320 | { | |
321 | *target_errno = inf_child_errno_to_fileio_error (errno); | |
322 | return NULL; | |
323 | } | |
324 | ||
325 | ret = xmalloc (len + 1); | |
326 | memcpy (ret, buf, len); | |
327 | ret[len] = '\0'; | |
328 | return ret; | |
329 | #else | |
330 | *target_errno = FILEIO_ENOSYS; | |
331 | return NULL; | |
332 | #endif | |
333 | } | |
334 | ||
7313baad | 335 | |
5bf970f9 AC |
336 | struct target_ops * |
337 | inf_child_target (void) | |
338 | { | |
339 | struct target_ops *t = XZALLOC (struct target_ops); | |
abbb1732 | 340 | |
5bf970f9 AC |
341 | t->to_shortname = "child"; |
342 | t->to_longname = "Unix child process"; | |
343 | t->to_doc = "Unix child process (started by the \"run\" command)."; | |
344 | t->to_open = inf_child_open; | |
345 | t->to_post_attach = inf_child_post_attach; | |
7681f339 AC |
346 | t->to_fetch_registers = inf_child_fetch_inferior_registers; |
347 | t->to_store_registers = inf_child_store_inferior_registers; | |
5bf970f9 AC |
348 | t->to_prepare_to_store = inf_child_prepare_to_store; |
349 | t->to_insert_breakpoint = memory_insert_breakpoint; | |
350 | t->to_remove_breakpoint = memory_remove_breakpoint; | |
351 | t->to_terminal_init = terminal_init_inferior; | |
352 | t->to_terminal_inferior = terminal_inferior; | |
353 | t->to_terminal_ours_for_output = terminal_ours_for_output; | |
354 | t->to_terminal_save_ours = terminal_save_ours; | |
355 | t->to_terminal_ours = terminal_ours; | |
356 | t->to_terminal_info = child_terminal_info; | |
357 | t->to_post_startup_inferior = inf_child_post_startup_inferior; | |
5bf970f9 | 358 | t->to_follow_fork = inf_child_follow_fork; |
5bf970f9 | 359 | t->to_can_run = inf_child_can_run; |
5bf970f9 AC |
360 | t->to_pid_to_exec_file = inf_child_pid_to_exec_file; |
361 | t->to_stratum = process_stratum; | |
c35b1492 PA |
362 | t->to_has_all_memory = default_child_has_all_memory; |
363 | t->to_has_memory = default_child_has_memory; | |
364 | t->to_has_stack = default_child_has_stack; | |
365 | t->to_has_registers = default_child_has_registers; | |
366 | t->to_has_execution = default_child_has_execution; | |
7313baad UW |
367 | t->to_fileio_open = inf_child_fileio_open; |
368 | t->to_fileio_pwrite = inf_child_fileio_pwrite; | |
369 | t->to_fileio_pread = inf_child_fileio_pread; | |
370 | t->to_fileio_close = inf_child_fileio_close; | |
371 | t->to_fileio_unlink = inf_child_fileio_unlink; | |
b9e7b9c3 | 372 | t->to_fileio_readlink = inf_child_fileio_readlink; |
5bf970f9 AC |
373 | t->to_magic = OPS_MAGIC; |
374 | return t; | |
375 | } |