2 * Copyright (c) 2002 Marcel Moolenaar
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include "opt_watchdog.h"
32 #include <sys/param.h>
33 #include <sys/systm.h>
36 #include <sys/sysctl.h>
37 #include <sys/kernel.h>
39 #include <sys/kerneldump.h>
41 #include <sys/watchdog.h>
45 #include <machine/elf.h>
46 #include <machine/md_var.h>
47 #include <machine/pcb.h>
48 #include <machine/cache.h>
50 CTASSERT(sizeof(struct kerneldumpheader) == 512);
53 TUNABLE_INT("debug.minidump", &do_minidump);
54 SYSCTL_INT(_debug, OID_AUTO, minidump, CTLFLAG_RW, &do_minidump, 0,
55 "Enable mini crash dumps");
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.
61 #define SIZEOF_METADATA (64*1024)
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;
72 typedef int callback_t(struct md_pa *, int, void *);
74 static struct kerneldumpheader kdh;
75 static off_t dumplo, fileofs;
77 /* Handle buffered writes. */
78 static char buffer[DEV_BSIZE];
81 /* XXX: I suppose 20 should be enough. */
82 static struct md_pa dump_map[20];
89 bzero(dump_map, sizeof(dump_map));
90 for (n = 0; n < sizeof(dump_map) / sizeof(dump_map[0]); n++) {
92 if (dump_avail[idx] == 0 && dump_avail[idx + 1] == 0)
94 dump_map[n].md_start = dump_avail[idx];
95 dump_map[n].md_size = dump_avail[idx + 1] - dump_avail[idx];
103 return (&dump_map[0]);
106 static struct md_pa *
107 md_pa_next(struct md_pa *mdp)
111 if (mdp->md_size == 0)
117 buf_write(struct dumperinfo *di, char *ptr, size_t sz)
123 len = DEV_BSIZE - fragsz;
126 bcopy(ptr, buffer + fragsz, len);
130 if (fragsz == DEV_BSIZE) {
131 error = dump_write(di, buffer, 0, dumplo,
144 buf_flush(struct dumperinfo *di)
151 error = dump_write(di, buffer, 0, dumplo, DEV_BSIZE);
157 extern vm_offset_t kernel_l1kva;
161 cb_dumpdata(struct md_pa *mdp, int seqnr, void *arg)
163 struct dumperinfo *di = (struct dumperinfo*)arg;
166 size_t counter, sz, chunk;
169 error = 0; /* catch case in which chunk size is 0 */
171 pgs = mdp->md_size / PAGE_SIZE;
174 printf(" chunk %d: %dMB (%d pages)", seqnr, pgs * PAGE_SIZE / (
177 /* Make sure we write coherent datas. */
178 mips_dcache_wbinv_all();
181 if (chunk > MAXDUMPPGS)
183 sz = chunk << PAGE_SHIFT;
186 printf(" %d", pgs * PAGE_SIZE);
187 counter &= (1<<24) - 1;
191 wdog_kern_pat(WD_LASTVAL);
193 error = dump_write(di, (void *)(intptr_t)(pa),0, dumplo, sz); /* XXX fix PA */
200 /* Check for user abort. */
205 printf(" (CTRL-C to abort) ");
207 printf(" ... %s\n", (error) ? "fail" : "ok");
212 cb_dumphdr(struct md_pa *mdp, int seqnr, void *arg)
214 struct dumperinfo *di = (struct dumperinfo*)arg;
220 bzero(&phdr, sizeof(phdr));
221 phdr.p_type = PT_LOAD;
222 phdr.p_flags = PF_R; /* XXX */
223 phdr.p_offset = fileofs;
224 phdr.p_vaddr = mdp->md_start;
225 phdr.p_paddr = mdp->md_start;
226 phdr.p_filesz = size;
228 phdr.p_align = PAGE_SIZE;
230 error = buf_write(di, (char*)&phdr, sizeof(phdr));
231 fileofs += phdr.p_filesz;
236 cb_size(struct md_pa *mdp, int seqnr, void *arg)
238 uint32_t *sz = (uint32_t*)arg;
240 *sz += (uint32_t)mdp->md_size;
245 foreach_chunk(callback_t cb, void *arg)
252 while (mdp != NULL) {
253 error = (*cb)(mdp, seqnr++, arg);
256 mdp = md_pa_next(mdp);
262 dumpsys(struct dumperinfo *di)
275 bzero(&ehdr, sizeof(ehdr));
276 ehdr.e_ident[EI_MAG0] = ELFMAG0;
277 ehdr.e_ident[EI_MAG1] = ELFMAG1;
278 ehdr.e_ident[EI_MAG2] = ELFMAG2;
279 ehdr.e_ident[EI_MAG3] = ELFMAG3;
280 ehdr.e_ident[EI_CLASS] = ELF_CLASS;
281 #if BYTE_ORDER == LITTLE_ENDIAN
282 ehdr.e_ident[EI_DATA] = ELFDATA2LSB;
284 ehdr.e_ident[EI_DATA] = ELFDATA2MSB;
286 ehdr.e_ident[EI_VERSION] = EV_CURRENT;
287 ehdr.e_ident[EI_OSABI] = ELFOSABI_STANDALONE; /* XXX big picture? */
288 ehdr.e_type = ET_CORE;
289 ehdr.e_machine = EM_MIPS;
290 ehdr.e_phoff = sizeof(ehdr);
292 ehdr.e_ehsize = sizeof(ehdr);
293 ehdr.e_phentsize = sizeof(Elf_Phdr);
294 ehdr.e_shentsize = sizeof(Elf_Shdr);
298 /* Calculate dump size. */
300 ehdr.e_phnum = foreach_chunk(cb_size, &dumpsize);
301 hdrsz = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize;
302 fileofs = MD_ALIGN(hdrsz);
304 hdrgap = fileofs - DEV_ALIGN(hdrsz);
306 /* Determine dump offset on device. */
307 if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
311 dumplo = di->mediaoffset + di->mediasize - dumpsize;
312 dumplo -= sizeof(kdh) * 2;
314 mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_MIPS_VERSION, dumpsize, di->blocksize);
316 printf("Dumping %llu MB (%d chunks)\n", (long long)dumpsize >> 20,
320 error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
323 dumplo += sizeof(kdh);
325 /* Dump ELF header */
326 error = buf_write(di, (char*)&ehdr, sizeof(ehdr));
330 /* Dump program headers */
331 error = foreach_chunk(cb_dumphdr, di);
337 * All headers are written using blocked I/O, so we know the
338 * current offset is (still) block aligned. Skip the alignement
339 * in the file to have the segment contents aligned at page
340 * boundary. We cannot use MD_ALIGN on dumplo, because we don't
341 * care and may very well be unaligned within the dump device.
345 /* Dump memory chunks (updates dumplo) */
346 error = foreach_chunk(cb_dumpdata, di);
351 error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
355 /* Signal completion, signoff and exit stage left. */
356 dump_write(di, NULL, 0, 0, 0);
357 printf("\nDump complete\n");
364 if (error == ECANCELED)
365 printf("\nDump aborted\n");
366 else if (error == ENOSPC)
367 printf("\nDump failed. Partition too small.\n");
369 printf("\n** DUMP FAILED (ERROR %d) **\n", error);