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 <sys/param.h>
31 #include <sys/systm.h>
34 #include <sys/sysctl.h>
35 #include <sys/kernel.h>
37 #include <sys/kerneldump.h>
40 #include <machine/elf.h>
41 #include <machine/md_var.h>
42 #include <machine/pcb.h>
43 #include <machine/cache.h>
45 CTASSERT(sizeof(struct kerneldumpheader) == 512);
48 TUNABLE_INT("debug.minidump", &do_minidump);
49 SYSCTL_INT(_debug, OID_AUTO, minidump, CTLFLAG_RW, &do_minidump, 0,
50 "Enable mini crash dumps");
53 * Don't touch the first SIZEOF_METADATA bytes on the dump device. This
54 * is to protect us from metadata and to protect metadata from us.
56 #define SIZEOF_METADATA (64*1024)
58 #define MD_ALIGN(x) (((off_t)(x) + PAGE_MASK) & ~PAGE_MASK)
59 #define DEV_ALIGN(x) (((off_t)(x) + (DEV_BSIZE-1)) & ~(DEV_BSIZE-1))
60 extern struct pcb dumppcb;
67 typedef int callback_t(struct md_pa *, int, void *);
69 static struct kerneldumpheader kdh;
70 static off_t dumplo, fileofs;
72 /* Handle buffered writes. */
73 static char buffer[DEV_BSIZE];
76 /* XXX: I suppose 20 should be enough. */
77 static struct md_pa dump_map[20];
84 bzero(dump_map, sizeof(dump_map));
85 for (n = 0; n < sizeof(dump_map) / sizeof(dump_map[0]); n++) {
87 if (dump_avail[idx] == 0 && dump_avail[idx + 1] == 0)
89 dump_map[n].md_start = dump_avail[idx];
90 dump_map[n].md_size = dump_avail[idx + 1] - dump_avail[idx];
98 return (&dump_map[0]);
101 static struct md_pa *
102 md_pa_next(struct md_pa *mdp)
106 if (mdp->md_size == 0)
112 buf_write(struct dumperinfo *di, char *ptr, size_t sz)
118 len = DEV_BSIZE - fragsz;
121 bcopy(ptr, buffer + fragsz, len);
125 if (fragsz == DEV_BSIZE) {
126 error = dump_write(di, buffer, 0, dumplo,
139 buf_flush(struct dumperinfo *di)
146 error = dump_write(di, buffer, 0, dumplo, DEV_BSIZE);
152 extern vm_offset_t kernel_l1kva;
156 cb_dumpdata(struct md_pa *mdp, int seqnr, void *arg)
158 struct dumperinfo *di = (struct dumperinfo*)arg;
161 size_t counter, sz, chunk;
164 error = 0; /* catch case in which chunk size is 0 */
166 pgs = mdp->md_size / PAGE_SIZE;
169 printf(" chunk %d: %dMB (%d pages)", seqnr, pgs * PAGE_SIZE / (
172 /* Make sure we write coherent datas. */
173 mips_dcache_wbinv_all();
176 if (chunk > MAXDUMPPGS)
178 sz = chunk << PAGE_SHIFT;
181 printf(" %d", pgs * PAGE_SIZE);
182 counter &= (1<<24) - 1;
185 error = dump_write(di, (void *)(pa),0, dumplo, sz);
192 /* Check for user abort. */
197 printf(" (CTRL-C to abort) ");
199 printf(" ... %s\n", (error) ? "fail" : "ok");
204 cb_dumphdr(struct md_pa *mdp, int seqnr, void *arg)
206 struct dumperinfo *di = (struct dumperinfo*)arg;
212 bzero(&phdr, sizeof(phdr));
213 phdr.p_type = PT_LOAD;
214 phdr.p_flags = PF_R; /* XXX */
215 phdr.p_offset = fileofs;
216 phdr.p_vaddr = mdp->md_start;
217 phdr.p_paddr = mdp->md_start;
218 phdr.p_filesz = size;
220 phdr.p_align = PAGE_SIZE;
222 error = buf_write(di, (char*)&phdr, sizeof(phdr));
223 fileofs += phdr.p_filesz;
228 cb_size(struct md_pa *mdp, int seqnr, void *arg)
230 uint32_t *sz = (uint32_t*)arg;
232 *sz += (uint32_t)mdp->md_size;
237 foreach_chunk(callback_t cb, void *arg)
244 while (mdp != NULL) {
245 error = (*cb)(mdp, seqnr++, arg);
248 mdp = md_pa_next(mdp);
254 dumpsys(struct dumperinfo *di)
267 bzero(&ehdr, sizeof(ehdr));
268 ehdr.e_ident[EI_MAG0] = ELFMAG0;
269 ehdr.e_ident[EI_MAG1] = ELFMAG1;
270 ehdr.e_ident[EI_MAG2] = ELFMAG2;
271 ehdr.e_ident[EI_MAG3] = ELFMAG3;
272 ehdr.e_ident[EI_CLASS] = ELF_CLASS;
273 #if BYTE_ORDER == LITTLE_ENDIAN
274 ehdr.e_ident[EI_DATA] = ELFDATA2LSB;
276 ehdr.e_ident[EI_DATA] = ELFDATA2MSB;
278 ehdr.e_ident[EI_VERSION] = EV_CURRENT;
279 ehdr.e_ident[EI_OSABI] = ELFOSABI_STANDALONE; /* XXX big picture? */
280 ehdr.e_type = ET_CORE;
281 ehdr.e_machine = EM_MIPS;
282 ehdr.e_phoff = sizeof(ehdr);
284 ehdr.e_ehsize = sizeof(ehdr);
285 ehdr.e_phentsize = sizeof(Elf_Phdr);
286 ehdr.e_shentsize = sizeof(Elf_Shdr);
290 /* Calculate dump size. */
292 ehdr.e_phnum = foreach_chunk(cb_size, &dumpsize);
293 hdrsz = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize;
294 fileofs = MD_ALIGN(hdrsz);
296 hdrgap = fileofs - DEV_ALIGN(hdrsz);
298 /* Determine dump offset on device. */
299 if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
303 dumplo = di->mediaoffset + di->mediasize - dumpsize;
304 dumplo -= sizeof(kdh) * 2;
306 mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_MIPS_VERSION, dumpsize, di->blocksize);
308 printf("Dumping %llu MB (%d chunks)\n", (long long)dumpsize >> 20,
312 error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
315 dumplo += sizeof(kdh);
317 /* Dump ELF header */
318 error = buf_write(di, (char*)&ehdr, sizeof(ehdr));
322 /* Dump program headers */
323 error = foreach_chunk(cb_dumphdr, di);
329 * All headers are written using blocked I/O, so we know the
330 * current offset is (still) block aligned. Skip the alignement
331 * in the file to have the segment contents aligned at page
332 * boundary. We cannot use MD_ALIGN on dumplo, because we don't
333 * care and may very well be unaligned within the dump device.
337 /* Dump memory chunks (updates dumplo) */
338 error = foreach_chunk(cb_dumpdata, di);
343 error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
347 /* Signal completion, signoff and exit stage left. */
348 dump_write(di, NULL, 0, 0, 0);
349 printf("\nDump complete\n");
356 if (error == ECANCELED)
357 printf("\nDump aborted\n");
358 else if (error == ENOSPC)
359 printf("\nDump failed. Partition too small.\n");
361 printf("\n** DUMP FAILED (ERROR %d) **\n", error);