Commit | Line | Data |
---|---|---|
2e0c3539 MK |
1 | /* BSD Kernel Data Access Library (libkvm) interface. |
2 | ||
961cb7b5 | 3 | Copyright 2004, 2005 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 | |
9 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #include "defs.h" | |
963c4174 MK |
23 | #include "cli/cli-cmds.h" |
24 | #include "command.h" | |
2e0c3539 MK |
25 | #include "frame.h" |
26 | #include "regcache.h" | |
27 | #include "target.h" | |
963c4174 | 28 | #include "value.h" |
7f245d65 | 29 | #include "gdbcore.h" /* for get_exec_file */ |
2e0c3539 MK |
30 | |
31 | #include "gdb_assert.h" | |
32 | #include <fcntl.h> | |
33 | #include <kvm.h> | |
ac5754fa | 34 | #ifdef HAVE_NLIST_H |
2e0c3539 | 35 | #include <nlist.h> |
ac5754fa | 36 | #endif |
2e0c3539 MK |
37 | #include "readline/readline.h" |
38 | #include <sys/param.h> | |
963c4174 | 39 | #include <sys/proc.h> |
2e0c3539 MK |
40 | #include <sys/user.h> |
41 | ||
42 | #include "bsd-kvm.h" | |
43 | ||
44 | /* Kernel memory interface descriptor. */ | |
45 | kvm_t *core_kd; | |
46 | ||
47 | /* Address of process control block. */ | |
48 | struct pcb *bsd_kvm_paddr; | |
49 | ||
50 | /* Pointer to architecture-specific function that reconstructs the | |
51 | register state from PCB and supplies it to REGCACHE. */ | |
52 | int (*bsd_kvm_supply_pcb)(struct regcache *regcache, struct pcb *pcb); | |
53 | ||
54 | /* Target ops for libkvm interface. */ | |
55 | struct target_ops bsd_kvm_ops; | |
56 | ||
57 | static void | |
58 | bsd_kvm_open (char *filename, int from_tty) | |
59 | { | |
60 | char errbuf[_POSIX2_LINE_MAX]; | |
61 | char *execfile = NULL; | |
62 | kvm_t *temp_kd; | |
63 | ||
64 | target_preopen (from_tty); | |
65 | ||
66 | if (filename) | |
67 | { | |
68 | char *temp; | |
69 | ||
70 | filename = tilde_expand (filename); | |
71 | if (filename[0] != '/') | |
72 | { | |
1754f103 | 73 | temp = concat (current_directory, "/", filename, (char *)NULL); |
2e0c3539 MK |
74 | xfree (filename); |
75 | filename = temp; | |
76 | } | |
77 | } | |
78 | ||
7f245d65 | 79 | execfile = get_exec_file (0); |
2e0c3539 MK |
80 | temp_kd = kvm_openfiles (execfile, filename, NULL, O_RDONLY, errbuf); |
81 | if (temp_kd == NULL) | |
8a3fe4f8 | 82 | error (("%s"), errbuf); |
2e0c3539 MK |
83 | |
84 | unpush_target (&bsd_kvm_ops); | |
85 | core_kd = temp_kd; | |
86 | push_target (&bsd_kvm_ops); | |
87 | ||
88 | target_fetch_registers (-1); | |
89 | ||
90 | flush_cached_frames (); | |
91 | select_frame (get_current_frame ()); | |
b04f3ab4 | 92 | print_stack_frame (get_selected_frame (NULL), -1, 1); |
2e0c3539 MK |
93 | } |
94 | ||
95 | static void | |
96 | bsd_kvm_close (int quitting) | |
97 | { | |
98 | if (core_kd) | |
99 | { | |
100 | if (kvm_close (core_kd) == -1) | |
8a3fe4f8 | 101 | warning (("%s"), kvm_geterr(core_kd)); |
2e0c3539 MK |
102 | core_kd = NULL; |
103 | } | |
104 | } | |
105 | ||
961cb7b5 MK |
106 | static LONGEST |
107 | bsd_kvm_xfer_memory (CORE_ADDR addr, ULONGEST len, | |
108 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
2e0c3539 | 109 | { |
961cb7b5 MK |
110 | ssize_t nbytes = len; |
111 | ||
112 | if (readbuf) | |
113 | nbytes = kvm_read (core_kd, addr, readbuf, nbytes); | |
114 | if (writebuf && nbytes > 0) | |
115 | nbytes = kvm_write (core_kd, addr, writebuf, nbytes); | |
116 | return nbytes; | |
117 | } | |
2e0c3539 | 118 | |
961cb7b5 MK |
119 | static LONGEST |
120 | bsd_kvm_xfer_partial (struct target_ops *ops, enum target_object object, | |
121 | const char *annex, gdb_byte *readbuf, | |
122 | const gdb_byte *writebuf, | |
123 | ULONGEST offset, LONGEST len) | |
124 | { | |
125 | switch (object) | |
126 | { | |
127 | case TARGET_OBJECT_MEMORY: | |
128 | return bsd_kvm_xfer_memory (offset, len, readbuf, writebuf); | |
129 | ||
130 | default: | |
131 | return -1; | |
132 | } | |
2e0c3539 MK |
133 | } |
134 | ||
135 | /* Fetch process control block at address PADDR. */ | |
136 | ||
137 | static int | |
138 | bsd_kvm_fetch_pcb (struct pcb *paddr) | |
139 | { | |
140 | struct pcb pcb; | |
141 | ||
142 | if (kvm_read (core_kd, (unsigned long) paddr, &pcb, sizeof pcb) == -1) | |
8a3fe4f8 | 143 | error (("%s"), kvm_geterr (core_kd)); |
2e0c3539 MK |
144 | |
145 | gdb_assert (bsd_kvm_supply_pcb); | |
146 | return bsd_kvm_supply_pcb (current_regcache, &pcb); | |
147 | } | |
148 | ||
149 | static void | |
150 | bsd_kvm_fetch_registers (int regnum) | |
151 | { | |
152 | struct nlist nl[2]; | |
153 | ||
154 | if (bsd_kvm_paddr) | |
efe1d7b9 MK |
155 | { |
156 | bsd_kvm_fetch_pcb (bsd_kvm_paddr); | |
157 | return; | |
158 | } | |
2e0c3539 MK |
159 | |
160 | /* On dumping core, BSD kernels store the faulting context (PCB) | |
161 | in the variable "dumppcb". */ | |
162 | memset (nl, 0, sizeof nl); | |
163 | nl[0].n_name = "_dumppcb"; | |
164 | ||
165 | if (kvm_nlist (core_kd, nl) == -1) | |
8a3fe4f8 | 166 | error (("%s"), kvm_geterr (core_kd)); |
2e0c3539 MK |
167 | |
168 | if (nl[0].n_value != 0) | |
169 | { | |
170 | /* Found dumppcb. If it contains a valid context, return | |
171 | immediately. */ | |
172 | if (bsd_kvm_fetch_pcb ((struct pcb *) nl[0].n_value)) | |
173 | return; | |
174 | } | |
175 | ||
176 | /* Traditional BSD kernels have a process proc0 that should always | |
177 | be present. The address of proc0's PCB is stored in the variable | |
178 | "proc0paddr". */ | |
179 | ||
180 | memset (nl, 0, sizeof nl); | |
181 | nl[0].n_name = "_proc0paddr"; | |
182 | ||
183 | if (kvm_nlist (core_kd, nl) == -1) | |
8a3fe4f8 | 184 | error (("%s"), kvm_geterr (core_kd)); |
2e0c3539 MK |
185 | |
186 | if (nl[0].n_value != 0) | |
187 | { | |
188 | struct pcb *paddr; | |
189 | ||
190 | /* Found proc0paddr. */ | |
191 | if (kvm_read (core_kd, nl[0].n_value, &paddr, sizeof paddr) == -1) | |
8a3fe4f8 | 192 | error (("%s"), kvm_geterr (core_kd)); |
2e0c3539 MK |
193 | |
194 | bsd_kvm_fetch_pcb (paddr); | |
195 | return; | |
196 | } | |
197 | ||
198 | #ifdef HAVE_STRUCT_THREAD_TD_PCB | |
199 | /* In FreeBSD kernels for 5.0-RELEASE and later, the PCB no longer | |
200 | lives in `struct proc' but in `struct thread'. The `struct | |
201 | thread' for the initial thread for proc0 can be found in the | |
202 | variable "thread0". */ | |
203 | ||
204 | memset (nl, 0, sizeof nl); | |
205 | nl[0].n_name = "_thread0"; | |
206 | ||
207 | if (kvm_nlist (core_kd, nl) == -1) | |
8a3fe4f8 | 208 | error (("%s"), kvm_geterr (core_kd)); |
2e0c3539 MK |
209 | |
210 | if (nl[0].n_value != 0) | |
211 | { | |
212 | struct pcb *paddr; | |
213 | ||
214 | /* Found thread0. */ | |
efe1d7b9 MK |
215 | nl[0].n_value += offsetof (struct thread, td_pcb); |
216 | if (kvm_read (core_kd, nl[0].n_value, &paddr, sizeof paddr) == -1) | |
8a3fe4f8 | 217 | error (("%s"), kvm_geterr (core_kd)); |
2e0c3539 MK |
218 | |
219 | bsd_kvm_fetch_pcb (paddr); | |
220 | return; | |
221 | } | |
222 | #endif | |
223 | ||
3d263c1d BI |
224 | /* i18n: PCB == "Process Control Block" */ |
225 | error (_("Cannot find a valid PCB")); | |
2e0c3539 MK |
226 | } |
227 | \f | |
228 | ||
963c4174 | 229 | /* Kernel memory interface commands. */ |
fdb1bf9d | 230 | struct cmd_list_element *bsd_kvm_cmdlist; |
963c4174 MK |
231 | |
232 | static void | |
233 | bsd_kvm_cmd (char *arg, int fromtty) | |
234 | { | |
235 | /* ??? Should this become an alias for "target kvm"? */ | |
236 | } | |
237 | ||
238 | #ifndef HAVE_STRUCT_THREAD_TD_PCB | |
239 | ||
240 | static void | |
241 | bsd_kvm_proc_cmd (char *arg, int fromtty) | |
242 | { | |
243 | CORE_ADDR addr; | |
244 | ||
245 | if (arg == NULL) | |
3d263c1d | 246 | error_no_arg (_("proc address")); |
963c4174 MK |
247 | |
248 | if (core_kd == NULL) | |
3d263c1d | 249 | error (_("No kernel memory image.")); |
963c4174 MK |
250 | |
251 | addr = parse_and_eval_address (arg); | |
da7d81e3 NW |
252 | #ifdef HAVE_STRUCT_LWP |
253 | addr += offsetof (struct lwp, l_addr); | |
254 | #else | |
963c4174 | 255 | addr += offsetof (struct proc, p_addr); |
da7d81e3 | 256 | #endif |
963c4174 MK |
257 | |
258 | if (kvm_read (core_kd, addr, &bsd_kvm_paddr, sizeof bsd_kvm_paddr) == -1) | |
8a3fe4f8 | 259 | error (("%s"), kvm_geterr (core_kd)); |
963c4174 MK |
260 | |
261 | target_fetch_registers (-1); | |
262 | ||
263 | flush_cached_frames (); | |
264 | select_frame (get_current_frame ()); | |
b04f3ab4 | 265 | print_stack_frame (get_selected_frame (NULL), -1, 1); |
963c4174 MK |
266 | } |
267 | ||
268 | #endif | |
269 | ||
270 | static void | |
271 | bsd_kvm_pcb_cmd (char *arg, int fromtty) | |
272 | { | |
273 | if (arg == NULL) | |
3d263c1d BI |
274 | /* i18n: PCB == "Process Control Block" */ |
275 | error_no_arg (_("pcb address")); | |
963c4174 MK |
276 | |
277 | if (core_kd == NULL) | |
3d263c1d | 278 | error (_("No kernel memory image.")); |
963c4174 | 279 | |
57ac95b8 | 280 | bsd_kvm_paddr = (struct pcb *)(u_long) parse_and_eval_address (arg); |
963c4174 MK |
281 | |
282 | target_fetch_registers (-1); | |
283 | ||
284 | flush_cached_frames (); | |
285 | select_frame (get_current_frame ()); | |
b04f3ab4 | 286 | print_stack_frame (get_selected_frame (NULL), -1, 1); |
963c4174 MK |
287 | } |
288 | ||
2e0c3539 MK |
289 | /* Add the libkvm interface to the list of all possible targets and |
290 | register CUPPLY_PCB as the architecture-specific process control | |
291 | block interpreter. */ | |
292 | ||
293 | void | |
294 | bsd_kvm_add_target (int (*supply_pcb)(struct regcache *, struct pcb *)) | |
295 | { | |
296 | gdb_assert (bsd_kvm_supply_pcb == NULL); | |
297 | bsd_kvm_supply_pcb = supply_pcb; | |
298 | ||
299 | bsd_kvm_ops.to_shortname = "kvm"; | |
3d263c1d BI |
300 | bsd_kvm_ops.to_longname = _("Kernel memory interface"); |
301 | bsd_kvm_ops.to_doc = _("Use a kernel virtual memory image as a target.\n\ | |
302 | Optionally specify the filename of a core dump."); | |
2e0c3539 MK |
303 | bsd_kvm_ops.to_open = bsd_kvm_open; |
304 | bsd_kvm_ops.to_close = bsd_kvm_close; | |
305 | bsd_kvm_ops.to_fetch_registers = bsd_kvm_fetch_registers; | |
961cb7b5 | 306 | bsd_kvm_ops.to_xfer_partial = bsd_kvm_xfer_partial; |
2e0c3539 MK |
307 | bsd_kvm_ops.to_stratum = process_stratum; |
308 | bsd_kvm_ops.to_has_memory = 1; | |
309 | bsd_kvm_ops.to_has_stack = 1; | |
310 | bsd_kvm_ops.to_has_registers = 1; | |
311 | bsd_kvm_ops.to_magic = OPS_MAGIC; | |
312 | ||
313 | add_target (&bsd_kvm_ops); | |
963c4174 | 314 | |
3d263c1d BI |
315 | add_prefix_cmd ("kvm", class_obscure, bsd_kvm_cmd, _("\ |
316 | Generic command for manipulating the kernel memory interface."), | |
963c4174 MK |
317 | &bsd_kvm_cmdlist, "kvm ", 0, &cmdlist); |
318 | ||
319 | #ifndef HAVE_STRUCT_THREAD_TD_PCB | |
320 | add_cmd ("proc", class_obscure, bsd_kvm_proc_cmd, | |
3d263c1d | 321 | _("Set current context from proc address"), &bsd_kvm_cmdlist); |
963c4174 MK |
322 | #endif |
323 | add_cmd ("pcb", class_obscure, bsd_kvm_pcb_cmd, | |
3d263c1d BI |
324 | /* i18n: PCB == "Process Control Block" */ |
325 | _("Set current context from pcb address"), &bsd_kvm_cmdlist); | |
2e0c3539 | 326 | } |