FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_dump.c
1 /*-
2 * Copyright (c) 2002 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>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/conf.h>
33 #include <sys/cons.h>
34 #include <sys/kernel.h>
35 #include <sys/proc.h>
36 #include <sys/kerneldump.h>
37 #include <sys/watchdog.h>
38 #include <vm/vm.h>
39 #include <vm/vm_param.h>
40 #include <vm/pmap.h>
41 #include <machine/dump.h>
42 #include <machine/elf.h>
43 #include <machine/md_var.h>
44 #include <machine/pcb.h>
45
46 CTASSERT(sizeof(struct kerneldumpheader) == 512);
47
48 #define MD_ALIGN(x) roundup2((off_t)(x), PAGE_SIZE)
49
50 /* Handle buffered writes. */
51 static size_t fragsz;
52
53 struct dump_pa dump_map[DUMPSYS_MD_PA_NPAIRS];
54
55 #if !defined(__powerpc__) && !defined(__sparc__)
56 void
57 dumpsys_gen_pa_init(void)
58 {
59 int n, idx;
60
61 bzero(dump_map, sizeof(dump_map));
62 for (n = 0; n < nitems(dump_map); n++) {
63 idx = n * 2;
64 if (dump_avail[idx] == 0 && dump_avail[idx + 1] == 0)
65 break;
66 dump_map[n].pa_start = dump_avail[idx];
67 dump_map[n].pa_size = dump_avail[idx + 1] - dump_avail[idx];
68 }
69 }
70 #endif
71
72 struct dump_pa *
73 dumpsys_gen_pa_next(struct dump_pa *mdp)
74 {
75
76 if (mdp == NULL)
77 return (&dump_map[0]);
78
79 mdp++;
80 if (mdp->pa_size == 0)
81 mdp = NULL;
82 return (mdp);
83 }
84
85 void
86 dumpsys_gen_wbinv_all(void)
87 {
88
89 }
90
91 void
92 dumpsys_gen_unmap_chunk(vm_paddr_t pa __unused, size_t chunk __unused,
93 void *va __unused)
94 {
95
96 }
97
98 #if !defined(__sparc__)
99 int
100 dumpsys_gen_write_aux_headers(struct dumperinfo *di)
101 {
102
103 return (0);
104 }
105 #endif
106
107 int
108 dumpsys_buf_seek(struct dumperinfo *di, size_t sz)
109 {
110 static uint8_t buf[DEV_BSIZE];
111 size_t nbytes;
112 int error;
113
114 bzero(buf, sizeof(buf));
115
116 while (sz > 0) {
117 nbytes = MIN(sz, sizeof(buf));
118
119 error = dump_append(di, buf, 0, nbytes);
120 if (error)
121 return (error);
122 sz -= nbytes;
123 }
124
125 return (0);
126 }
127
128 int
129 dumpsys_buf_write(struct dumperinfo *di, char *ptr, size_t sz)
130 {
131 size_t len;
132 int error;
133
134 while (sz) {
135 len = di->blocksize - fragsz;
136 if (len > sz)
137 len = sz;
138 memcpy((char *)di->blockbuf + fragsz, ptr, len);
139 fragsz += len;
140 ptr += len;
141 sz -= len;
142 if (fragsz == di->blocksize) {
143 error = dump_append(di, di->blockbuf, 0, di->blocksize);
144 if (error)
145 return (error);
146 fragsz = 0;
147 }
148 }
149 return (0);
150 }
151
152 int
153 dumpsys_buf_flush(struct dumperinfo *di)
154 {
155 int error;
156
157 if (fragsz == 0)
158 return (0);
159
160 error = dump_append(di, di->blockbuf, 0, di->blocksize);
161 fragsz = 0;
162 return (error);
163 }
164
165 CTASSERT(PAGE_SHIFT < 20);
166 #define PG2MB(pgs) ((pgs + (1 << (20 - PAGE_SHIFT)) - 1) >> (20 - PAGE_SHIFT))
167
168 int
169 dumpsys_cb_dumpdata(struct dump_pa *mdp, int seqnr, void *arg)
170 {
171 struct dumperinfo *di = (struct dumperinfo*)arg;
172 vm_paddr_t pa;
173 void *va;
174 uint64_t pgs;
175 size_t counter, sz, chunk;
176 int c, error;
177 u_int maxdumppgs;
178
179 error = 0; /* catch case in which chunk size is 0 */
180 counter = 0; /* Update twiddle every 16MB */
181 va = NULL;
182 pgs = mdp->pa_size / PAGE_SIZE;
183 pa = mdp->pa_start;
184 maxdumppgs = min(di->maxiosize / PAGE_SIZE, MAXDUMPPGS);
185 if (maxdumppgs == 0) /* seatbelt */
186 maxdumppgs = 1;
187
188 printf(" chunk %d: %juMB (%ju pages)", seqnr, (uintmax_t)PG2MB(pgs),
189 (uintmax_t)pgs);
190
191 dumpsys_wbinv_all();
192 while (pgs) {
193 chunk = pgs;
194 if (chunk > maxdumppgs)
195 chunk = maxdumppgs;
196 sz = chunk << PAGE_SHIFT;
197 counter += sz;
198 if (counter >> 24) {
199 printf(" %ju", (uintmax_t)PG2MB(pgs));
200 counter &= (1 << 24) - 1;
201 }
202
203 dumpsys_map_chunk(pa, chunk, &va);
204 wdog_kern_pat(WD_LASTVAL);
205
206 error = dump_append(di, va, 0, sz);
207 dumpsys_unmap_chunk(pa, chunk, va);
208 if (error)
209 break;
210 pgs -= chunk;
211 pa += sz;
212
213 /* Check for user abort. */
214 c = cncheckc();
215 if (c == 0x03)
216 return (ECANCELED);
217 if (c != -1)
218 printf(" (CTRL-C to abort) ");
219 }
220 printf(" ... %s\n", (error) ? "fail" : "ok");
221 return (error);
222 }
223
224 int
225 dumpsys_foreach_chunk(dumpsys_callback_t cb, void *arg)
226 {
227 struct dump_pa *mdp;
228 int error, seqnr;
229
230 seqnr = 0;
231 mdp = dumpsys_pa_next(NULL);
232 while (mdp != NULL) {
233 error = (*cb)(mdp, seqnr++, arg);
234 if (error)
235 return (-error);
236 mdp = dumpsys_pa_next(mdp);
237 }
238 return (seqnr);
239 }
240
241 #if !defined(__sparc__)
242 static off_t fileofs;
243
244 static int
245 cb_dumphdr(struct dump_pa *mdp, int seqnr, void *arg)
246 {
247 struct dumperinfo *di = (struct dumperinfo*)arg;
248 Elf_Phdr phdr;
249 uint64_t size;
250 int error;
251
252 size = mdp->pa_size;
253 bzero(&phdr, sizeof(phdr));
254 phdr.p_type = PT_LOAD;
255 phdr.p_flags = PF_R; /* XXX */
256 phdr.p_offset = fileofs;
257 #ifdef __powerpc__
258 phdr.p_vaddr = (do_minidump? mdp->pa_start : ~0L);
259 phdr.p_paddr = (do_minidump? ~0L : mdp->pa_start);
260 #else
261 phdr.p_vaddr = mdp->pa_start;
262 phdr.p_paddr = mdp->pa_start;
263 #endif
264 phdr.p_filesz = size;
265 phdr.p_memsz = size;
266 phdr.p_align = PAGE_SIZE;
267
268 error = dumpsys_buf_write(di, (char*)&phdr, sizeof(phdr));
269 fileofs += phdr.p_filesz;
270 return (error);
271 }
272
273 static int
274 cb_size(struct dump_pa *mdp, int seqnr, void *arg)
275 {
276 uint64_t *sz;
277
278 sz = (uint64_t *)arg;
279 *sz += (uint64_t)mdp->pa_size;
280 return (0);
281 }
282
283 int
284 dumpsys_generic(struct dumperinfo *di)
285 {
286 static struct kerneldumpheader kdh;
287 Elf_Ehdr ehdr;
288 uint64_t dumpsize;
289 off_t hdrgap;
290 size_t hdrsz;
291 int error;
292
293 #ifndef __powerpc__
294 if (do_minidump)
295 return (minidumpsys(di));
296 #endif
297
298 bzero(&ehdr, sizeof(ehdr));
299 ehdr.e_ident[EI_MAG0] = ELFMAG0;
300 ehdr.e_ident[EI_MAG1] = ELFMAG1;
301 ehdr.e_ident[EI_MAG2] = ELFMAG2;
302 ehdr.e_ident[EI_MAG3] = ELFMAG3;
303 ehdr.e_ident[EI_CLASS] = ELF_CLASS;
304 #if BYTE_ORDER == LITTLE_ENDIAN
305 ehdr.e_ident[EI_DATA] = ELFDATA2LSB;
306 #else
307 ehdr.e_ident[EI_DATA] = ELFDATA2MSB;
308 #endif
309 ehdr.e_ident[EI_VERSION] = EV_CURRENT;
310 ehdr.e_ident[EI_OSABI] = ELFOSABI_STANDALONE; /* XXX big picture? */
311 ehdr.e_type = ET_CORE;
312 ehdr.e_machine = EM_VALUE;
313 ehdr.e_phoff = sizeof(ehdr);
314 ehdr.e_flags = 0;
315 ehdr.e_ehsize = sizeof(ehdr);
316 ehdr.e_phentsize = sizeof(Elf_Phdr);
317 ehdr.e_shentsize = sizeof(Elf_Shdr);
318
319 dumpsys_pa_init();
320
321 /* Calculate dump size. */
322 dumpsize = 0L;
323 ehdr.e_phnum = dumpsys_foreach_chunk(cb_size, &dumpsize) +
324 DUMPSYS_NUM_AUX_HDRS;
325 hdrsz = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize;
326 fileofs = MD_ALIGN(hdrsz);
327 dumpsize += fileofs;
328 hdrgap = fileofs - roundup2((off_t)hdrsz, di->blocksize);
329
330 dump_init_header(di, &kdh, KERNELDUMPMAGIC, KERNELDUMP_ARCH_VERSION,
331 dumpsize);
332
333 error = dump_start(di, &kdh);
334 if (error != 0)
335 goto fail;
336
337 printf("Dumping %ju MB (%d chunks)\n", (uintmax_t)dumpsize >> 20,
338 ehdr.e_phnum - DUMPSYS_NUM_AUX_HDRS);
339
340 /* Dump ELF header */
341 error = dumpsys_buf_write(di, (char*)&ehdr, sizeof(ehdr));
342 if (error)
343 goto fail;
344
345 /* Dump program headers */
346 error = dumpsys_foreach_chunk(cb_dumphdr, di);
347 if (error < 0)
348 goto fail;
349 error = dumpsys_write_aux_headers(di);
350 if (error < 0)
351 goto fail;
352 dumpsys_buf_flush(di);
353
354 /*
355 * All headers are written using blocked I/O, so we know the
356 * current offset is (still) block aligned. Skip the alignement
357 * in the file to have the segment contents aligned at page
358 * boundary.
359 */
360 error = dumpsys_buf_seek(di, (size_t)hdrgap);
361 if (error)
362 goto fail;
363
364 /* Dump memory chunks. */
365 error = dumpsys_foreach_chunk(dumpsys_cb_dumpdata, di);
366 if (error < 0)
367 goto fail;
368
369 error = dump_finish(di, &kdh);
370 if (error != 0)
371 goto fail;
372
373 printf("\nDump complete\n");
374 return (0);
375
376 fail:
377 if (error < 0)
378 error = -error;
379
380 if (error == ECANCELED)
381 printf("\nDump aborted\n");
382 else if (error == E2BIG || error == ENOSPC)
383 printf("\nDump failed. Partition too small.\n");
384 else
385 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
386 return (error);
387 }
388 #endif
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