1/*
2 * Copyright (c) 2004 Marcel Moolenaar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
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58static void kgdb_core_cleanup(void *);
59
60static char *vmcore;
61static struct target_ops kgdb_trgt_ops;
62
63kvm_t *kvm;
64static char kvm_err[_POSIX2_LINE_MAX];
65
66#define KERNOFF (kgdb_kernbase ())
67#define INKERNEL(x) ((x) >= KERNOFF)
68
69static CORE_ADDR
70kgdb_kernbase (void)
71{
72 static CORE_ADDR kernbase;
73 struct minimal_symbol *sym;
74
75 if (kernbase == 0) {
76 sym = lookup_minimal_symbol ("kernbase", NULL, NULL);
77 if (sym == NULL) {
78 kernbase = KERNBASE;
79 } else {
80 kernbase = SYMBOL_VALUE_ADDRESS (sym);
81 }
82 }
83 return kernbase;
84}
85
86static void
87kgdb_trgt_open(char *filename, int from_tty)
88{
89 struct cleanup *old_chain;
90 struct thread_info *ti;
91 struct kthr *kt;
92 kvm_t *nkvm;
93 char *temp;
94 int ontop;
95
96 target_preopen (from_tty);
97 if (!filename)
98 error ("No vmcore file specified.");
99 if (!exec_bfd)
100 error ("Can't open a vmcore without a kernel");
101
102 filename = tilde_expand (filename);
103 if (filename[0] != '/') {
104 temp = concat (current_directory, "/", filename, NULL);
105 xfree(filename);
106 filename = temp;
107 }
108
109 old_chain = make_cleanup (xfree, filename);
110
111 nkvm = kvm_openfiles(bfd_get_filename(exec_bfd), filename, NULL,
112 write_files ? O_RDWR : O_RDONLY, kvm_err);
113 if (nkvm == NULL)
114 error ("Failed to open vmcore: %s", kvm_err);
115
116 /* Don't free the filename now and close any previous vmcore. */
117 discard_cleanups(old_chain);
118 unpush_target(&kgdb_trgt_ops);
119
120 kvm = nkvm;
121 vmcore = filename;
122 old_chain = make_cleanup(kgdb_core_cleanup, NULL);
123
124 ontop = !push_target (&kgdb_trgt_ops);
125 discard_cleanups (old_chain);
126
127 kgdb_dmesg();
128
129 init_thread_list();
130 kt = kgdb_thr_init();
131 while (kt != NULL) {
132 ti = add_thread(pid_to_ptid(kt->tid));
133 kt = kgdb_thr_next(kt);
134 }
135 if (curkthr != 0)
136 inferior_ptid = pid_to_ptid(curkthr->tid);
137
138 if (ontop) {
139 /* XXX: fetch registers? */
140 kld_init();
141 flush_cached_frames();
142 select_frame (get_current_frame());
143 print_stack_frame(get_selected_frame(),
144 frame_relative_level(get_selected_frame()), 1);
145 } else
146 warning(
147 "you won't be able to access this vmcore until you terminate\n\
148your %s; do ``info files''", target_longname);
149}
150
151static void
152kgdb_trgt_close(int quitting)
153{
154
155 if (kvm != NULL) {
156 inferior_ptid = null_ptid;
157 CLEAR_SOLIB();
158 if (kvm_close(kvm) != 0)
159 warning("cannot close \"%s\": %s", vmcore,
160 kvm_geterr(kvm));
161 kvm = NULL;
162 xfree(vmcore);
163 vmcore = NULL;
164 if (kgdb_trgt_ops.to_sections) {
165 xfree(kgdb_trgt_ops.to_sections);
166 kgdb_trgt_ops.to_sections = NULL;
167 kgdb_trgt_ops.to_sections_end = NULL;
168 }
169 }
170}
171
172static void
173kgdb_core_cleanup(void *arg)
174{
175
176 kgdb_trgt_close(0);
177}
178
179static void
180kgdb_trgt_detach(char *args, int from_tty)
181{
182
183 if (args)
184 error ("Too many arguments");
185 unpush_target(&kgdb_trgt_ops);
186 reinit_frame_cache();
187 if (from_tty)
188 printf_filtered("No vmcore file now.\n");
189}
190
191static char *
192kgdb_trgt_extra_thread_info(struct thread_info *ti)
193{
194
195 return (kgdb_thr_extra_thread_info(ptid_get_pid(ti->ptid)));
196}
197
198static void
199kgdb_trgt_files_info(struct target_ops *target)
200{
201
202 printf_filtered ("\t`%s', ", vmcore);
203 wrap_here (" ");
204 printf_filtered ("file type %s.\n", "FreeBSD kernel vmcore");
205}
206
207static void
208kgdb_trgt_find_new_threads(void)
209{
210 struct target_ops *tb;
211
212 if (kvm != NULL)
213 return;
214
215 tb = find_target_beneath(&kgdb_trgt_ops);
216 if (tb->to_find_new_threads != NULL)
217 tb->to_find_new_threads();
218}
219
220static char *
221kgdb_trgt_pid_to_str(ptid_t ptid)
222{
223 static char buf[33];
224
225 snprintf(buf, sizeof(buf), "Thread %d", ptid_get_pid(ptid));
226 return (buf);
227}
228
229static int
230kgdb_trgt_thread_alive(ptid_t ptid)
231{
232 return (kgdb_thr_lookup_tid(ptid_get_pid(ptid)) != NULL);
233}
234
235static int
236kgdb_trgt_xfer_memory(CORE_ADDR memaddr, char *myaddr, int len, int write,
237 struct mem_attrib *attrib, struct target_ops *target)
238{
239 struct target_ops *tb;
240
241 if (kvm != NULL) {
242 if (len == 0)
243 return (0);
244 if (!write)
245 return (kvm_read(kvm, memaddr, myaddr, len));
246 else
247 return (kvm_write(kvm, memaddr, myaddr, len));
248 }
249 tb = find_target_beneath(target);
250 return (tb->to_xfer_memory(memaddr, myaddr, len, write, attrib, tb));
251}
252
253static int
254kgdb_trgt_ignore_breakpoints(CORE_ADDR addr, char *contents)
255{
256
257 return 0;
258}
259
260static void
261kgdb_switch_to_thread(int tid)
262{
263 char buf[16];
264 int thread_id;
265
266 thread_id = pid_to_thread_id(pid_to_ptid(tid));
267 if (thread_id == 0)
268 error ("invalid tid");
269 snprintf(buf, sizeof(buf), "%d", thread_id);
270 gdb_thread_select(uiout, buf);
271}
272
273static void
274kgdb_set_proc_cmd (char *arg, int from_tty)
275{
276 CORE_ADDR addr;
277 struct kthr *thr;
278
279 if (!arg)
280 error_no_arg ("proc address for the new context");
281
282 if (kvm == NULL)
283 error ("only supported for core file target");
284
285 addr = (CORE_ADDR) parse_and_eval_address (arg);
286
287 if (!INKERNEL (addr)) {
288 thr = kgdb_thr_lookup_pid((int)addr);
289 if (thr == NULL)
290 error ("invalid pid");
291 } else {
292 thr = kgdb_thr_lookup_paddr(addr);
293 if (thr == NULL)
294 error("invalid proc address");
295 }
296 kgdb_switch_to_thread(thr->tid);
297}
298
299static void
300kgdb_set_tid_cmd (char *arg, int from_tty)
301{
302 CORE_ADDR addr;
303 struct kthr *thr;
304
305 if (!arg)
306 error_no_arg ("TID or thread address for the new context");
307
308 addr = (CORE_ADDR) parse_and_eval_address (arg);
309
310 if (kvm != NULL && INKERNEL (addr)) {
311 thr = kgdb_thr_lookup_taddr(addr);
312 if (thr == NULL)
313 error("invalid thread address");
314 addr = thr->tid;
315 }
316 kgdb_switch_to_thread(addr);
317}
318
319int fbsdcoreops_suppress_target = 1;
320
321void
322initialize_kgdb_target(void)
323{
324
325 kgdb_trgt_ops.to_magic = OPS_MAGIC;
326 kgdb_trgt_ops.to_shortname = "kernel";
327 kgdb_trgt_ops.to_longname = "kernel core dump file";
328 kgdb_trgt_ops.to_doc =
329 "Use a vmcore file as a target. Specify the filename of the vmcore file.";
330 kgdb_trgt_ops.to_stratum = core_stratum;
331 kgdb_trgt_ops.to_has_memory = 1;
332 kgdb_trgt_ops.to_has_registers = 1;
333 kgdb_trgt_ops.to_has_stack = 1;
334
335 kgdb_trgt_ops.to_open = kgdb_trgt_open;
336 kgdb_trgt_ops.to_close = kgdb_trgt_close;
337 kgdb_trgt_ops.to_attach = find_default_attach;
338 kgdb_trgt_ops.to_detach = kgdb_trgt_detach;
339 kgdb_trgt_ops.to_extra_thread_info = kgdb_trgt_extra_thread_info;
340 kgdb_trgt_ops.to_fetch_registers = kgdb_trgt_fetch_registers;
341 kgdb_trgt_ops.to_files_info = kgdb_trgt_files_info;
342 kgdb_trgt_ops.to_find_new_threads = kgdb_trgt_find_new_threads;
343 kgdb_trgt_ops.to_pid_to_str = kgdb_trgt_pid_to_str;
344 kgdb_trgt_ops.to_store_registers = kgdb_trgt_store_registers;
345 kgdb_trgt_ops.to_thread_alive = kgdb_trgt_thread_alive;
346 kgdb_trgt_ops.to_xfer_memory = kgdb_trgt_xfer_memory;
347 kgdb_trgt_ops.to_insert_breakpoint = kgdb_trgt_ignore_breakpoints;
348 kgdb_trgt_ops.to_remove_breakpoint = kgdb_trgt_ignore_breakpoints;
349
350 add_target(&kgdb_trgt_ops);
351
352 add_com ("proc", class_obscure, kgdb_set_proc_cmd,
353 "Set current process context");
354 add_com ("tid", class_obscure, kgdb_set_tid_cmd,
355 "Set current thread context");
356}
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