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 "opt_watchdog.h"
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/conf.h>
35 #include <sys/cons.h>
36 #include <sys/sysctl.h>
37 #include <sys/kernel.h>
38 #include <sys/proc.h>
39 #include <sys/kerneldump.h>
40 #ifdef SW_WATCHDOG
41 #include <sys/watchdog.h>
42 #endif
43 #include <vm/vm.h>
44 #include <vm/pmap.h>
45 #include <machine/elf.h>
46 #include <machine/md_var.h>
47 #include <machine/pcb.h>
48 #include <machine/armreg.h>
49
50 CTASSERT(sizeof(struct kerneldumpheader) == 512);
51
52 int do_minidump = 1;
53 TUNABLE_INT("debug.minidump", &do_minidump);
54 SYSCTL_INT(_debug, OID_AUTO, minidump, CTLFLAG_RW, &do_minidump, 0,
55 "Enable mini crash dumps");
56
57 /*
58 * Don't touch the first SIZEOF_METADATA bytes on the dump device. This
59 * is to protect us from metadata and to protect metadata from us.
60 */
61 #define SIZEOF_METADATA (64*1024)
62
63 #define MD_ALIGN(x) (((off_t)(x) + PAGE_MASK) & ~PAGE_MASK)
64 #define DEV_ALIGN(x) (((off_t)(x) + (DEV_BSIZE-1)) & ~(DEV_BSIZE-1))
65 extern struct pcb dumppcb;
66
67 struct md_pa {
68 vm_paddr_t md_start;
69 vm_paddr_t md_size;
70 };
71
72 typedef int callback_t(struct md_pa *, int, void *);
73
74 static struct kerneldumpheader kdh;
75 static off_t dumplo, fileofs;
76
77 /* Handle buffered writes. */
78 static char buffer[DEV_BSIZE];
79 static size_t fragsz;
80
81 /* XXX: I suppose 20 should be enough. */
82 static struct md_pa dump_map[20];
83
84 static void
85 md_pa_init(void)
86 {
87 int n, idx;
88
89 bzero(dump_map, sizeof(dump_map));
90 for (n = 0; n < sizeof(dump_map) / sizeof(dump_map[0]); n++) {
91 idx = n * 2;
92 if (dump_avail[idx] == 0 && dump_avail[idx + 1] == 0)
93 break;
94 dump_map[n].md_start = dump_avail[idx];
95 dump_map[n].md_size = dump_avail[idx + 1] - dump_avail[idx];
96 }
97 }
98
99 static struct md_pa *
100 md_pa_first(void)
101 {
102
103 return (&dump_map[0]);
104 }
105
106 static struct md_pa *
107 md_pa_next(struct md_pa *mdp)
108 {
109
110 mdp++;
111 if (mdp->md_size == 0)
112 mdp = NULL;
113 return (mdp);
114 }
115
116 static int
117 buf_write(struct dumperinfo *di, char *ptr, size_t sz)
118 {
119 size_t len;
120 int error;
121
122 while (sz) {
123 len = DEV_BSIZE - fragsz;
124 if (len > sz)
125 len = sz;
126 bcopy(ptr, buffer + fragsz, len);
127 fragsz += len;
128 ptr += len;
129 sz -= len;
130 if (fragsz == DEV_BSIZE) {
131 error = dump_write(di, buffer, 0, dumplo,
132 DEV_BSIZE);
133 if (error)
134 return error;
135 dumplo += DEV_BSIZE;
136 fragsz = 0;
137 }
138 }
139
140 return (0);
141 }
142
143 static int
144 buf_flush(struct dumperinfo *di)
145 {
146 int error;
147
148 if (fragsz == 0)
149 return (0);
150
151 error = dump_write(di, buffer, 0, dumplo, DEV_BSIZE);
152 dumplo += DEV_BSIZE;
153 fragsz = 0;
154 return (error);
155 }
156
157 extern vm_offset_t kernel_l1kva;
158 extern char *pouet2;
159
160 static int
161 cb_dumpdata(struct md_pa *mdp, int seqnr, void *arg)
162 {
163 struct dumperinfo *di = (struct dumperinfo*)arg;
164 vm_paddr_t a, pa;
165 void *va;
166 uint32_t pgs;
167 size_t counter, sz, chunk;
168 int i, c, error;
169
170 va = 0;
171 error = 0; /* catch case in which chunk size is 0 */
172 counter = 0;
173 pgs = mdp->md_size / PAGE_SIZE;
174 pa = mdp->md_start;
175
176 printf(" chunk %d: %dMB (%d pages)", seqnr, pgs * PAGE_SIZE / (
177 1024*1024), pgs);
178
179 /*
180 * Make sure we write coherent data. Note that in the SMP case this
181 * only operates on the L1 cache of the current CPU, but all other CPUs
182 * have already been stopped, and their flush/invalidate was done as
183 * part of stopping.
184 */
185 cpu_idcache_wbinv_all();
186 cpu_l2cache_wbinv_all();
187 #ifdef __XSCALE__
188 xscale_cache_clean_minidata();
189 #endif
190 while (pgs) {
191 chunk = pgs;
192 if (chunk > MAXDUMPPGS)
193 chunk = MAXDUMPPGS;
194 sz = chunk << PAGE_SHIFT;
195 counter += sz;
196 if (counter >> 24) {
197 printf(" %d", pgs * PAGE_SIZE);
198 counter &= (1<<24) - 1;
199 }
200 for (i = 0; i < chunk; i++) {
201 a = pa + i * PAGE_SIZE;
202 va = pmap_kenter_temporary(trunc_page(a), i);
203 }
204 #ifdef SW_WATCHDOG
205 wdog_kern_pat(WD_LASTVAL);
206 #endif
207 error = dump_write(di, va, 0, dumplo, sz);
208 if (error)
209 break;
210 dumplo += sz;
211 pgs -= chunk;
212 pa += sz;
213
214 /* Check for user abort. */
215 c = cncheckc();
216 if (c == 0x03)
217 return (ECANCELED);
218 if (c != -1)
219 printf(" (CTRL-C to abort) ");
220 }
221 printf(" ... %s\n", (error) ? "fail" : "ok");
222 return (error);
223 }
224
225 static int
226 cb_dumphdr(struct md_pa *mdp, int seqnr, void *arg)
227 {
228 struct dumperinfo *di = (struct dumperinfo*)arg;
229 Elf_Phdr phdr;
230 uint64_t size;
231 int error;
232
233 size = mdp->md_size;
234 bzero(&phdr, sizeof(phdr));
235 phdr.p_type = PT_LOAD;
236 phdr.p_flags = PF_R; /* XXX */
237 phdr.p_offset = fileofs;
238 phdr.p_vaddr = mdp->md_start;
239 phdr.p_paddr = mdp->md_start;
240 phdr.p_filesz = size;
241 phdr.p_memsz = size;
242 phdr.p_align = PAGE_SIZE;
243
244 error = buf_write(di, (char*)&phdr, sizeof(phdr));
245 fileofs += phdr.p_filesz;
246 return (error);
247 }
248
249 /*
250 * Add a header to be used by libkvm to get the va to pa delta
251 */
252 static int
253 dump_os_header(struct dumperinfo *di)
254 {
255 Elf_Phdr phdr;
256 int error;
257
258 bzero(&phdr, sizeof(phdr));
259 phdr.p_type = PT_DUMP_DELTA;
260 phdr.p_flags = PF_R; /* XXX */
261 phdr.p_offset = 0;
262 phdr.p_vaddr = KERNVIRTADDR;
263 phdr.p_paddr = pmap_kextract(KERNVIRTADDR);
264 phdr.p_filesz = 0;
265 phdr.p_memsz = 0;
266 phdr.p_align = PAGE_SIZE;
267
268 error = buf_write(di, (char*)&phdr, sizeof(phdr));
269 return (error);
270 }
271
272 static int
273 cb_size(struct md_pa *mdp, int seqnr, void *arg)
274 {
275 uint32_t *sz = (uint32_t*)arg;
276
277 *sz += (uint32_t)mdp->md_size;
278 return (0);
279 }
280
281 static int
282 foreach_chunk(callback_t cb, void *arg)
283 {
284 struct md_pa *mdp;
285 int error, seqnr;
286
287 seqnr = 0;
288 mdp = md_pa_first();
289 while (mdp != NULL) {
290 error = (*cb)(mdp, seqnr++, arg);
291 if (error)
292 return (-error);
293 mdp = md_pa_next(mdp);
294 }
295 return (seqnr);
296 }
297
298 void
299 dumpsys(struct dumperinfo *di)
300 {
301 Elf_Ehdr ehdr;
302 uint32_t dumpsize;
303 off_t hdrgap;
304 size_t hdrsz;
305 int error;
306
307 if (do_minidump) {
308 minidumpsys(di);
309 return;
310 }
311
312 bzero(&ehdr, sizeof(ehdr));
313 ehdr.e_ident[EI_MAG0] = ELFMAG0;
314 ehdr.e_ident[EI_MAG1] = ELFMAG1;
315 ehdr.e_ident[EI_MAG2] = ELFMAG2;
316 ehdr.e_ident[EI_MAG3] = ELFMAG3;
317 ehdr.e_ident[EI_CLASS] = ELF_CLASS;
318 #if BYTE_ORDER == LITTLE_ENDIAN
319 ehdr.e_ident[EI_DATA] = ELFDATA2LSB;
320 #else
321 ehdr.e_ident[EI_DATA] = ELFDATA2MSB;
322 #endif
323 ehdr.e_ident[EI_VERSION] = EV_CURRENT;
324 ehdr.e_ident[EI_OSABI] = ELFOSABI_STANDALONE; /* XXX big picture? */
325 ehdr.e_type = ET_CORE;
326 ehdr.e_machine = EM_ARM;
327 ehdr.e_phoff = sizeof(ehdr);
328 ehdr.e_flags = 0;
329 ehdr.e_ehsize = sizeof(ehdr);
330 ehdr.e_phentsize = sizeof(Elf_Phdr);
331 ehdr.e_shentsize = sizeof(Elf_Shdr);
332
333 md_pa_init();
334
335 /* Calculate dump size. */
336 dumpsize = 0L;
337 ehdr.e_phnum = foreach_chunk(cb_size, &dumpsize) + 1;
338 hdrsz = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize;
339 fileofs = MD_ALIGN(hdrsz);
340 dumpsize += fileofs;
341 hdrgap = fileofs - DEV_ALIGN(hdrsz);
342
343 /* Determine dump offset on device. */
344 if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
345 error = ENOSPC;
346 goto fail;
347 }
348 dumplo = di->mediaoffset + di->mediasize - dumpsize;
349 dumplo -= sizeof(kdh) * 2;
350
351 mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_ARM_VERSION, dumpsize, di->blocksize);
352
353 printf("Dumping %llu MB (%d chunks)\n", (long long)dumpsize >> 20,
354 ehdr.e_phnum - 1);
355
356 /* Dump leader */
357 error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
358 if (error)
359 goto fail;
360 dumplo += sizeof(kdh);
361
362 /* Dump ELF header */
363 error = buf_write(di, (char*)&ehdr, sizeof(ehdr));
364 if (error)
365 goto fail;
366
367 /* Dump program headers */
368 error = foreach_chunk(cb_dumphdr, di);
369 if (error >= 0)
370 error = dump_os_header(di);
371 if (error < 0)
372 goto fail;
373 buf_flush(di);
374
375 /*
376 * All headers are written using blocked I/O, so we know the
377 * current offset is (still) block aligned. Skip the alignement
378 * in the file to have the segment contents aligned at page
379 * boundary. We cannot use MD_ALIGN on dumplo, because we don't
380 * care and may very well be unaligned within the dump device.
381 */
382 dumplo += hdrgap;
383
384 /* Dump memory chunks (updates dumplo) */
385 error = foreach_chunk(cb_dumpdata, di);
386 if (error < 0)
387 goto fail;
388
389 /* Dump trailer */
390 error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
391 if (error)
392 goto fail;
393
394 /* Signal completion, signoff and exit stage left. */
395 dump_write(di, NULL, 0, 0, 0);
396 printf("\nDump complete\n");
397 return;
398
399 fail:
400 if (error < 0)
401 error = -error;
402
403 if (error == ECANCELED)
404 printf("\nDump aborted\n");
405 else if (error == ENOSPC)
406 printf("\nDump failed. Partition too small.\n");
407 else
408 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
409 }
Cache object: 179174bf327802d216fa244df5548371
|