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/kernel.h>
38 #include <sys/kerneldump.h>
40 #include <sys/watchdog.h>
43 #include <vm/vm_param.h>
45 #include <machine/dump.h>
46 #include <machine/elf.h>
47 #include <machine/md_var.h>
48 #include <machine/pcb.h>
50 CTASSERT(sizeof(struct kerneldumpheader) == 512);
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))
63 /* Handle buffered writes. */
64 static char buffer[DEV_BSIZE];
67 struct dump_pa dump_map[DUMPSYS_MD_PA_NPAIRS];
70 dumpsys_gen_pa_init(void)
72 #if !defined(__sparc__) && !defined(__powerpc__)
75 bzero(dump_map, sizeof(dump_map));
76 for (n = 0; n < sizeof(dump_map) / sizeof(dump_map[0]); n++) {
78 if (dump_avail[idx] == 0 && dump_avail[idx + 1] == 0)
80 dump_map[n].pa_start = dump_avail[idx];
81 dump_map[n].pa_size = dump_avail[idx + 1] - dump_avail[idx];
87 dumpsys_gen_pa_next(struct dump_pa *mdp)
91 return (&dump_map[0]);
94 if (mdp->pa_size == 0)
100 dumpsys_gen_wbinv_all(void)
105 dumpsys_gen_unmap_chunk(vm_paddr_t pa __unused, size_t chunk __unused,
111 dumpsys_gen_write_aux_headers(struct dumperinfo *di)
118 dumpsys_buf_write(struct dumperinfo *di, char *ptr, size_t sz)
124 len = DEV_BSIZE - fragsz;
127 bcopy(ptr, buffer + fragsz, len);
131 if (fragsz == DEV_BSIZE) {
132 error = dump_write(di, buffer, 0, dumplo,
144 dumpsys_buf_flush(struct dumperinfo *di)
151 error = dump_write(di, buffer, 0, dumplo, DEV_BSIZE);
157 CTASSERT(PAGE_SHIFT < 20);
158 #define PG2MB(pgs) ((pgs + (1 << (20 - PAGE_SHIFT)) - 1) >> (20 - PAGE_SHIFT))
161 dumpsys_cb_dumpdata(struct dump_pa *mdp, int seqnr, void *arg)
163 struct dumperinfo *di = (struct dumperinfo*)arg;
167 size_t counter, sz, chunk;
171 error = 0; /* catch case in which chunk size is 0 */
172 counter = 0; /* Update twiddle every 16MB */
174 pgs = mdp->pa_size / PAGE_SIZE;
176 maxdumppgs = min(di->maxiosize / PAGE_SIZE, MAXDUMPPGS);
177 if (maxdumppgs == 0) /* seatbelt */
180 printf(" chunk %d: %juMB (%ju pages)", seqnr, (uintmax_t)PG2MB(pgs),
186 if (chunk > maxdumppgs)
188 sz = chunk << PAGE_SHIFT;
191 printf(" %ju", (uintmax_t)PG2MB(pgs));
192 counter &= (1 << 24) - 1;
195 dumpsys_map_chunk(pa, chunk, &va);
197 wdog_kern_pat(WD_LASTVAL);
200 error = dump_write(di, va, 0, dumplo, sz);
201 dumpsys_unmap_chunk(pa, chunk, va);
208 /* Check for user abort. */
213 printf(" (CTRL-C to abort) ");
215 printf(" ... %s\n", (error) ? "fail" : "ok");
220 dumpsys_foreach_chunk(dumpsys_callback_t cb, void *arg)
226 mdp = dumpsys_pa_next(NULL);
227 while (mdp != NULL) {
228 error = (*cb)(mdp, seqnr++, arg);
231 mdp = dumpsys_pa_next(mdp);
236 static off_t fileofs;
239 cb_dumphdr(struct dump_pa *mdp, int seqnr, void *arg)
241 struct dumperinfo *di = (struct dumperinfo*)arg;
247 bzero(&phdr, sizeof(phdr));
248 phdr.p_type = PT_LOAD;
249 phdr.p_flags = PF_R; /* XXX */
250 phdr.p_offset = fileofs;
252 phdr.p_vaddr = (do_minidump? mdp->pa_start : ~0L);
253 phdr.p_paddr = (do_minidump? ~0L : mdp->pa_start);
255 phdr.p_vaddr = mdp->pa_start;
256 phdr.p_paddr = mdp->pa_start;
258 phdr.p_filesz = size;
260 phdr.p_align = PAGE_SIZE;
262 error = dumpsys_buf_write(di, (char*)&phdr, sizeof(phdr));
263 fileofs += phdr.p_filesz;
268 cb_size(struct dump_pa *mdp, int seqnr, void *arg)
272 sz = (uint64_t *)arg;
273 *sz += (uint64_t)mdp->pa_size;
278 dumpsys_generic(struct dumperinfo *di)
280 static struct kerneldumpheader kdh;
289 return (minidumpsys(di));
292 bzero(&ehdr, sizeof(ehdr));
293 ehdr.e_ident[EI_MAG0] = ELFMAG0;
294 ehdr.e_ident[EI_MAG1] = ELFMAG1;
295 ehdr.e_ident[EI_MAG2] = ELFMAG2;
296 ehdr.e_ident[EI_MAG3] = ELFMAG3;
297 ehdr.e_ident[EI_CLASS] = ELF_CLASS;
298 #if BYTE_ORDER == LITTLE_ENDIAN
299 ehdr.e_ident[EI_DATA] = ELFDATA2LSB;
301 ehdr.e_ident[EI_DATA] = ELFDATA2MSB;
303 ehdr.e_ident[EI_VERSION] = EV_CURRENT;
304 ehdr.e_ident[EI_OSABI] = ELFOSABI_STANDALONE; /* XXX big picture? */
305 ehdr.e_type = ET_CORE;
306 ehdr.e_machine = EM_VALUE;
307 ehdr.e_phoff = sizeof(ehdr);
309 ehdr.e_ehsize = sizeof(ehdr);
310 ehdr.e_phentsize = sizeof(Elf_Phdr);
311 ehdr.e_shentsize = sizeof(Elf_Shdr);
315 /* Calculate dump size. */
317 ehdr.e_phnum = dumpsys_foreach_chunk(cb_size, &dumpsize) +
318 DUMPSYS_NUM_AUX_HDRS;
319 hdrsz = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize;
320 fileofs = MD_ALIGN(hdrsz);
322 hdrgap = fileofs - DEV_ALIGN(hdrsz);
324 /* Determine dump offset on device. */
325 if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
329 dumplo = di->mediaoffset + di->mediasize - dumpsize;
330 dumplo -= sizeof(kdh) * 2;
332 mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_ARCH_VERSION, dumpsize,
335 printf("Dumping %ju MB (%d chunks)\n", (uintmax_t)dumpsize >> 20,
336 ehdr.e_phnum - DUMPSYS_NUM_AUX_HDRS);
339 error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
342 dumplo += sizeof(kdh);
344 /* Dump ELF header */
345 error = dumpsys_buf_write(di, (char*)&ehdr, sizeof(ehdr));
349 /* Dump program headers */
350 error = dumpsys_foreach_chunk(cb_dumphdr, di);
353 error = dumpsys_write_aux_headers(di);
356 dumpsys_buf_flush(di);
359 * All headers are written using blocked I/O, so we know the
360 * current offset is (still) block aligned. Skip the alignement
361 * in the file to have the segment contents aligned at page
362 * boundary. We cannot use MD_ALIGN on dumplo, because we don't
363 * care and may very well be unaligned within the dump device.
367 /* Dump memory chunks (updates dumplo) */
368 error = dumpsys_foreach_chunk(dumpsys_cb_dumpdata, di);
373 error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
377 /* Signal completion, signoff and exit stage left. */
378 dump_write(di, NULL, 0, 0, 0);
379 printf("\nDump complete\n");
386 if (error == ECANCELED)
387 printf("\nDump aborted\n");
388 else if (error == ENOSPC)
389 printf("\nDump failed. Partition too small.\n");
391 printf("\n** DUMP FAILED (ERROR %d) **\n", error);