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