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2e0c3539 MK |
1 | /* BSD Kernel Data Access Library (libkvm) interface. |
2 | ||
9b254dd1 | 3 | Copyright (C) 2004, 2005, 2007, 2008 Free Software Foundation, Inc. |
2e0c3539 MK |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
2e0c3539 MK |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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19 | |
20 | #include "defs.h" | |
963c4174 MK |
21 | #include "cli/cli-cmds.h" |
22 | #include "command.h" | |
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23 | #include "frame.h" |
24 | #include "regcache.h" | |
25 | #include "target.h" | |
963c4174 | 26 | #include "value.h" |
7f245d65 | 27 | #include "gdbcore.h" /* for get_exec_file */ |
2e0c3539 MK |
28 | |
29 | #include "gdb_assert.h" | |
30 | #include <fcntl.h> | |
31 | #include <kvm.h> | |
ac5754fa | 32 | #ifdef HAVE_NLIST_H |
2e0c3539 | 33 | #include <nlist.h> |
ac5754fa | 34 | #endif |
2e5a5020 | 35 | #include <paths.h> |
2e0c3539 MK |
36 | #include "readline/readline.h" |
37 | #include <sys/param.h> | |
963c4174 | 38 | #include <sys/proc.h> |
2e0c3539 MK |
39 | #include <sys/user.h> |
40 | ||
41 | #include "bsd-kvm.h" | |
42 | ||
2e5a5020 MK |
43 | /* Kernel memory device file. */ |
44 | static const char *bsd_kvm_corefile; | |
45 | ||
2e0c3539 | 46 | /* Kernel memory interface descriptor. */ |
2e5a5020 | 47 | static kvm_t *core_kd; |
2e0c3539 MK |
48 | |
49 | /* Address of process control block. */ | |
2e5a5020 | 50 | static struct pcb *bsd_kvm_paddr; |
2e0c3539 MK |
51 | |
52 | /* Pointer to architecture-specific function that reconstructs the | |
53 | register state from PCB and supplies it to REGCACHE. */ | |
2e5a5020 | 54 | static int (*bsd_kvm_supply_pcb)(struct regcache *regcache, struct pcb *pcb); |
2e0c3539 MK |
55 | |
56 | /* Target ops for libkvm interface. */ | |
2e5a5020 | 57 | static struct target_ops bsd_kvm_ops; |
2e0c3539 MK |
58 | |
59 | static void | |
60 | bsd_kvm_open (char *filename, int from_tty) | |
61 | { | |
62 | char errbuf[_POSIX2_LINE_MAX]; | |
63 | char *execfile = NULL; | |
64 | kvm_t *temp_kd; | |
65 | ||
66 | target_preopen (from_tty); | |
67 | ||
68 | if (filename) | |
69 | { | |
70 | char *temp; | |
71 | ||
72 | filename = tilde_expand (filename); | |
73 | if (filename[0] != '/') | |
74 | { | |
1754f103 | 75 | temp = concat (current_directory, "/", filename, (char *)NULL); |
2e0c3539 MK |
76 | xfree (filename); |
77 | filename = temp; | |
78 | } | |
79 | } | |
80 | ||
7f245d65 | 81 | execfile = get_exec_file (0); |
4a35b02a NW |
82 | temp_kd = kvm_openfiles (execfile, filename, NULL, |
83 | write_files ? O_RDWR : O_RDONLY, errbuf); | |
2e0c3539 | 84 | if (temp_kd == NULL) |
8a3fe4f8 | 85 | error (("%s"), errbuf); |
2e0c3539 | 86 | |
2e5a5020 | 87 | bsd_kvm_corefile = filename; |
2e0c3539 MK |
88 | unpush_target (&bsd_kvm_ops); |
89 | core_kd = temp_kd; | |
90 | push_target (&bsd_kvm_ops); | |
91 | ||
594f7785 | 92 | target_fetch_registers (get_current_regcache (), -1); |
2e0c3539 | 93 | |
35f196d9 | 94 | reinit_frame_cache (); |
b04f3ab4 | 95 | print_stack_frame (get_selected_frame (NULL), -1, 1); |
2e0c3539 MK |
96 | } |
97 | ||
98 | static void | |
99 | bsd_kvm_close (int quitting) | |
100 | { | |
101 | if (core_kd) | |
102 | { | |
103 | if (kvm_close (core_kd) == -1) | |
8a3fe4f8 | 104 | warning (("%s"), kvm_geterr(core_kd)); |
2e0c3539 MK |
105 | core_kd = NULL; |
106 | } | |
107 | } | |
108 | ||
961cb7b5 MK |
109 | static LONGEST |
110 | bsd_kvm_xfer_memory (CORE_ADDR addr, ULONGEST len, | |
111 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
2e0c3539 | 112 | { |
961cb7b5 MK |
113 | ssize_t nbytes = len; |
114 | ||
115 | if (readbuf) | |
116 | nbytes = kvm_read (core_kd, addr, readbuf, nbytes); | |
117 | if (writebuf && nbytes > 0) | |
118 | nbytes = kvm_write (core_kd, addr, writebuf, nbytes); | |
119 | return nbytes; | |
120 | } | |
2e0c3539 | 121 | |
961cb7b5 MK |
122 | static LONGEST |
123 | bsd_kvm_xfer_partial (struct target_ops *ops, enum target_object object, | |
124 | const char *annex, gdb_byte *readbuf, | |
125 | const gdb_byte *writebuf, | |
126 | ULONGEST offset, LONGEST len) | |
127 | { | |
128 | switch (object) | |
129 | { | |
130 | case TARGET_OBJECT_MEMORY: | |
131 | return bsd_kvm_xfer_memory (offset, len, readbuf, writebuf); | |
132 | ||
133 | default: | |
134 | return -1; | |
135 | } | |
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136 | } |
137 | ||
2e5a5020 MK |
138 | static void |
139 | bsd_kvm_files_info (struct target_ops *ops) | |
140 | { | |
141 | if (bsd_kvm_corefile && strcmp (bsd_kvm_corefile, _PATH_MEM) != 0) | |
142 | printf_filtered (_("\tUsing the kernel crash dump %s.\n"), | |
143 | bsd_kvm_corefile); | |
144 | else | |
145 | printf_filtered (_("\tUsing the currently running kernel.\n")); | |
146 | } | |
147 | ||
2e0c3539 MK |
148 | /* Fetch process control block at address PADDR. */ |
149 | ||
150 | static int | |
56be3814 | 151 | bsd_kvm_fetch_pcb (struct regcache *regcache, struct pcb *paddr) |
2e0c3539 MK |
152 | { |
153 | struct pcb pcb; | |
154 | ||
155 | if (kvm_read (core_kd, (unsigned long) paddr, &pcb, sizeof pcb) == -1) | |
8a3fe4f8 | 156 | error (("%s"), kvm_geterr (core_kd)); |
2e0c3539 MK |
157 | |
158 | gdb_assert (bsd_kvm_supply_pcb); | |
56be3814 | 159 | return bsd_kvm_supply_pcb (regcache, &pcb); |
2e0c3539 MK |
160 | } |
161 | ||
162 | static void | |
56be3814 | 163 | bsd_kvm_fetch_registers (struct regcache *regcache, int regnum) |
2e0c3539 MK |
164 | { |
165 | struct nlist nl[2]; | |
166 | ||
167 | if (bsd_kvm_paddr) | |
efe1d7b9 | 168 | { |
56be3814 | 169 | bsd_kvm_fetch_pcb (regcache, bsd_kvm_paddr); |
efe1d7b9 MK |
170 | return; |
171 | } | |
2e0c3539 MK |
172 | |
173 | /* On dumping core, BSD kernels store the faulting context (PCB) | |
174 | in the variable "dumppcb". */ | |
175 | memset (nl, 0, sizeof nl); | |
176 | nl[0].n_name = "_dumppcb"; | |
177 | ||
178 | if (kvm_nlist (core_kd, nl) == -1) | |
8a3fe4f8 | 179 | error (("%s"), kvm_geterr (core_kd)); |
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180 | |
181 | if (nl[0].n_value != 0) | |
182 | { | |
183 | /* Found dumppcb. If it contains a valid context, return | |
184 | immediately. */ | |
56be3814 | 185 | if (bsd_kvm_fetch_pcb (regcache, (struct pcb *) nl[0].n_value)) |
2e0c3539 MK |
186 | return; |
187 | } | |
188 | ||
189 | /* Traditional BSD kernels have a process proc0 that should always | |
190 | be present. The address of proc0's PCB is stored in the variable | |
191 | "proc0paddr". */ | |
192 | ||
193 | memset (nl, 0, sizeof nl); | |
194 | nl[0].n_name = "_proc0paddr"; | |
195 | ||
196 | if (kvm_nlist (core_kd, nl) == -1) | |
8a3fe4f8 | 197 | error (("%s"), kvm_geterr (core_kd)); |
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198 | |
199 | if (nl[0].n_value != 0) | |
200 | { | |
201 | struct pcb *paddr; | |
202 | ||
203 | /* Found proc0paddr. */ | |
204 | if (kvm_read (core_kd, nl[0].n_value, &paddr, sizeof paddr) == -1) | |
8a3fe4f8 | 205 | error (("%s"), kvm_geterr (core_kd)); |
2e0c3539 | 206 | |
56be3814 | 207 | bsd_kvm_fetch_pcb (regcache, paddr); |
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208 | return; |
209 | } | |
210 | ||
211 | #ifdef HAVE_STRUCT_THREAD_TD_PCB | |
212 | /* In FreeBSD kernels for 5.0-RELEASE and later, the PCB no longer | |
213 | lives in `struct proc' but in `struct thread'. The `struct | |
214 | thread' for the initial thread for proc0 can be found in the | |
215 | variable "thread0". */ | |
216 | ||
217 | memset (nl, 0, sizeof nl); | |
218 | nl[0].n_name = "_thread0"; | |
219 | ||
220 | if (kvm_nlist (core_kd, nl) == -1) | |
8a3fe4f8 | 221 | error (("%s"), kvm_geterr (core_kd)); |
2e0c3539 MK |
222 | |
223 | if (nl[0].n_value != 0) | |
224 | { | |
225 | struct pcb *paddr; | |
226 | ||
227 | /* Found thread0. */ | |
efe1d7b9 MK |
228 | nl[0].n_value += offsetof (struct thread, td_pcb); |
229 | if (kvm_read (core_kd, nl[0].n_value, &paddr, sizeof paddr) == -1) | |
8a3fe4f8 | 230 | error (("%s"), kvm_geterr (core_kd)); |
2e0c3539 | 231 | |
56be3814 | 232 | bsd_kvm_fetch_pcb (regcache, paddr); |
2e0c3539 MK |
233 | return; |
234 | } | |
235 | #endif | |
236 | ||
3d263c1d BI |
237 | /* i18n: PCB == "Process Control Block" */ |
238 | error (_("Cannot find a valid PCB")); | |
2e0c3539 MK |
239 | } |
240 | \f | |
241 | ||
963c4174 | 242 | /* Kernel memory interface commands. */ |
fdb1bf9d | 243 | struct cmd_list_element *bsd_kvm_cmdlist; |
963c4174 MK |
244 | |
245 | static void | |
246 | bsd_kvm_cmd (char *arg, int fromtty) | |
247 | { | |
248 | /* ??? Should this become an alias for "target kvm"? */ | |
249 | } | |
250 | ||
251 | #ifndef HAVE_STRUCT_THREAD_TD_PCB | |
252 | ||
253 | static void | |
254 | bsd_kvm_proc_cmd (char *arg, int fromtty) | |
255 | { | |
256 | CORE_ADDR addr; | |
257 | ||
258 | if (arg == NULL) | |
3d263c1d | 259 | error_no_arg (_("proc address")); |
963c4174 MK |
260 | |
261 | if (core_kd == NULL) | |
3d263c1d | 262 | error (_("No kernel memory image.")); |
963c4174 MK |
263 | |
264 | addr = parse_and_eval_address (arg); | |
da7d81e3 NW |
265 | #ifdef HAVE_STRUCT_LWP |
266 | addr += offsetof (struct lwp, l_addr); | |
267 | #else | |
963c4174 | 268 | addr += offsetof (struct proc, p_addr); |
da7d81e3 | 269 | #endif |
963c4174 MK |
270 | |
271 | if (kvm_read (core_kd, addr, &bsd_kvm_paddr, sizeof bsd_kvm_paddr) == -1) | |
8a3fe4f8 | 272 | error (("%s"), kvm_geterr (core_kd)); |
963c4174 | 273 | |
594f7785 | 274 | target_fetch_registers (get_current_regcache (), -1); |
963c4174 | 275 | |
35f196d9 | 276 | reinit_frame_cache (); |
b04f3ab4 | 277 | print_stack_frame (get_selected_frame (NULL), -1, 1); |
963c4174 MK |
278 | } |
279 | ||
280 | #endif | |
281 | ||
282 | static void | |
283 | bsd_kvm_pcb_cmd (char *arg, int fromtty) | |
284 | { | |
285 | if (arg == NULL) | |
3d263c1d BI |
286 | /* i18n: PCB == "Process Control Block" */ |
287 | error_no_arg (_("pcb address")); | |
963c4174 MK |
288 | |
289 | if (core_kd == NULL) | |
3d263c1d | 290 | error (_("No kernel memory image.")); |
963c4174 | 291 | |
57ac95b8 | 292 | bsd_kvm_paddr = (struct pcb *)(u_long) parse_and_eval_address (arg); |
963c4174 | 293 | |
594f7785 | 294 | target_fetch_registers (get_current_regcache (), -1); |
963c4174 | 295 | |
35f196d9 | 296 | reinit_frame_cache (); |
b04f3ab4 | 297 | print_stack_frame (get_selected_frame (NULL), -1, 1); |
963c4174 MK |
298 | } |
299 | ||
2e0c3539 MK |
300 | /* Add the libkvm interface to the list of all possible targets and |
301 | register CUPPLY_PCB as the architecture-specific process control | |
302 | block interpreter. */ | |
303 | ||
304 | void | |
305 | bsd_kvm_add_target (int (*supply_pcb)(struct regcache *, struct pcb *)) | |
306 | { | |
307 | gdb_assert (bsd_kvm_supply_pcb == NULL); | |
308 | bsd_kvm_supply_pcb = supply_pcb; | |
309 | ||
310 | bsd_kvm_ops.to_shortname = "kvm"; | |
3d263c1d BI |
311 | bsd_kvm_ops.to_longname = _("Kernel memory interface"); |
312 | bsd_kvm_ops.to_doc = _("Use a kernel virtual memory image as a target.\n\ | |
313 | Optionally specify the filename of a core dump."); | |
2e0c3539 MK |
314 | bsd_kvm_ops.to_open = bsd_kvm_open; |
315 | bsd_kvm_ops.to_close = bsd_kvm_close; | |
316 | bsd_kvm_ops.to_fetch_registers = bsd_kvm_fetch_registers; | |
961cb7b5 | 317 | bsd_kvm_ops.to_xfer_partial = bsd_kvm_xfer_partial; |
2e5a5020 | 318 | bsd_kvm_ops.to_files_info = bsd_kvm_files_info; |
2e0c3539 MK |
319 | bsd_kvm_ops.to_stratum = process_stratum; |
320 | bsd_kvm_ops.to_has_memory = 1; | |
321 | bsd_kvm_ops.to_has_stack = 1; | |
322 | bsd_kvm_ops.to_has_registers = 1; | |
323 | bsd_kvm_ops.to_magic = OPS_MAGIC; | |
324 | ||
325 | add_target (&bsd_kvm_ops); | |
963c4174 | 326 | |
3d263c1d BI |
327 | add_prefix_cmd ("kvm", class_obscure, bsd_kvm_cmd, _("\ |
328 | Generic command for manipulating the kernel memory interface."), | |
963c4174 MK |
329 | &bsd_kvm_cmdlist, "kvm ", 0, &cmdlist); |
330 | ||
331 | #ifndef HAVE_STRUCT_THREAD_TD_PCB | |
332 | add_cmd ("proc", class_obscure, bsd_kvm_proc_cmd, | |
3d263c1d | 333 | _("Set current context from proc address"), &bsd_kvm_cmdlist); |
963c4174 MK |
334 | #endif |
335 | add_cmd ("pcb", class_obscure, bsd_kvm_pcb_cmd, | |
3d263c1d BI |
336 | /* i18n: PCB == "Process Control Block" */ |
337 | _("Set current context from pcb address"), &bsd_kvm_cmdlist); | |
2e0c3539 | 338 | } |