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/armreg.h>
50 CTASSERT(sizeof(struct kerneldumpheader) == 512);
53 SYSCTL_INT(_debug, OID_AUTO, minidump, CTLFLAG_RWTUN, &do_minidump, 0,
54 "Enable mini crash dumps");
57 * Don't touch the first SIZEOF_METADATA bytes on the dump device. This
58 * is to protect us from metadata and to protect metadata from us.
60 #define SIZEOF_METADATA (64*1024)
62 #define MD_ALIGN(x) (((off_t)(x) + PAGE_MASK) & ~PAGE_MASK)
63 #define DEV_ALIGN(x) (((off_t)(x) + (DEV_BSIZE-1)) & ~(DEV_BSIZE-1))
64 extern struct pcb dumppcb;
71 typedef int callback_t(struct md_pa *, int, void *);
73 static struct kerneldumpheader kdh;
74 static off_t dumplo, fileofs;
76 /* Handle buffered writes. */
77 static char buffer[DEV_BSIZE];
80 /* XXX: I suppose 20 should be enough. */
81 static struct md_pa dump_map[20];
88 bzero(dump_map, sizeof(dump_map));
89 for (n = 0; n < sizeof(dump_map) / sizeof(dump_map[0]); n++) {
91 if (dump_avail[idx] == 0 && dump_avail[idx + 1] == 0)
93 dump_map[n].md_start = dump_avail[idx];
94 dump_map[n].md_size = dump_avail[idx + 1] - dump_avail[idx];
102 return (&dump_map[0]);
105 static struct md_pa *
106 md_pa_next(struct md_pa *mdp)
110 if (mdp->md_size == 0)
116 buf_write(struct dumperinfo *di, char *ptr, size_t sz)
122 len = DEV_BSIZE - fragsz;
125 bcopy(ptr, buffer + fragsz, len);
129 if (fragsz == DEV_BSIZE) {
130 error = dump_write(di, buffer, 0, dumplo,
143 buf_flush(struct dumperinfo *di)
150 error = dump_write(di, buffer, 0, dumplo, DEV_BSIZE);
156 extern vm_offset_t kernel_l1kva;
160 cb_dumpdata(struct md_pa *mdp, int seqnr, void *arg)
162 struct dumperinfo *di = (struct dumperinfo*)arg;
165 size_t counter, sz, chunk;
168 error = 0; /* catch case in which chunk size is 0 */
170 pgs = mdp->md_size / PAGE_SIZE;
173 printf(" chunk %d: %dMB (%d pages)", seqnr, pgs * PAGE_SIZE / (
177 * Make sure we write coherent data. Note that in the SMP case this
178 * only operates on the L1 cache of the current CPU, but all other CPUs
179 * have already been stopped, and their flush/invalidate was done as
182 cpu_idcache_wbinv_all();
183 cpu_l2cache_wbinv_all();
185 xscale_cache_clean_minidata();
189 if (chunk > MAXDUMPPGS)
191 sz = chunk << PAGE_SHIFT;
194 printf(" %d", pgs * PAGE_SIZE);
195 counter &= (1<<24) - 1;
197 if (pa == (pa & L1_ADDR_BITS)) {
198 pmap_kenter_section(0, pa & L1_ADDR_BITS, 0);
199 cpu_tlb_flushID_SE(0);
203 wdog_kern_pat(WD_LASTVAL);
205 error = dump_write(di,
206 (void *)(pa - (pa & L1_ADDR_BITS)),0, dumplo, sz);
213 /* Check for user abort. */
218 printf(" (CTRL-C to abort) ");
220 printf(" ... %s\n", (error) ? "fail" : "ok");
225 cb_dumphdr(struct md_pa *mdp, int seqnr, void *arg)
227 struct dumperinfo *di = (struct dumperinfo*)arg;
233 bzero(&phdr, sizeof(phdr));
234 phdr.p_type = PT_LOAD;
235 phdr.p_flags = PF_R; /* XXX */
236 phdr.p_offset = fileofs;
237 phdr.p_vaddr = mdp->md_start;
238 phdr.p_paddr = mdp->md_start;
239 phdr.p_filesz = size;
241 phdr.p_align = PAGE_SIZE;
243 error = buf_write(di, (char*)&phdr, sizeof(phdr));
244 fileofs += phdr.p_filesz;
249 * Add a header to be used by libkvm to get the va to pa delta
252 dump_os_header(struct dumperinfo *di)
257 bzero(&phdr, sizeof(phdr));
258 phdr.p_type = PT_DUMP_DELTA;
259 phdr.p_flags = PF_R; /* XXX */
261 phdr.p_vaddr = KERNVIRTADDR;
262 phdr.p_paddr = pmap_kextract(KERNVIRTADDR);
265 phdr.p_align = PAGE_SIZE;
267 error = buf_write(di, (char*)&phdr, sizeof(phdr));
272 cb_size(struct md_pa *mdp, int seqnr, void *arg)
274 uint32_t *sz = (uint32_t*)arg;
276 *sz += (uint32_t)mdp->md_size;
281 foreach_chunk(callback_t cb, void *arg)
288 while (mdp != NULL) {
289 error = (*cb)(mdp, seqnr++, arg);
292 mdp = md_pa_next(mdp);
298 dumpsys(struct dumperinfo *di)
307 return (minidumpsys(di));
309 bzero(&ehdr, sizeof(ehdr));
310 ehdr.e_ident[EI_MAG0] = ELFMAG0;
311 ehdr.e_ident[EI_MAG1] = ELFMAG1;
312 ehdr.e_ident[EI_MAG2] = ELFMAG2;
313 ehdr.e_ident[EI_MAG3] = ELFMAG3;
314 ehdr.e_ident[EI_CLASS] = ELF_CLASS;
315 #if BYTE_ORDER == LITTLE_ENDIAN
316 ehdr.e_ident[EI_DATA] = ELFDATA2LSB;
318 ehdr.e_ident[EI_DATA] = ELFDATA2MSB;
320 ehdr.e_ident[EI_VERSION] = EV_CURRENT;
321 ehdr.e_ident[EI_OSABI] = ELFOSABI_STANDALONE; /* XXX big picture? */
322 ehdr.e_type = ET_CORE;
323 ehdr.e_machine = EM_ARM;
324 ehdr.e_phoff = sizeof(ehdr);
326 ehdr.e_ehsize = sizeof(ehdr);
327 ehdr.e_phentsize = sizeof(Elf_Phdr);
328 ehdr.e_shentsize = sizeof(Elf_Shdr);
332 /* Calculate dump size. */
334 ehdr.e_phnum = foreach_chunk(cb_size, &dumpsize) + 1;
335 hdrsz = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize;
336 fileofs = MD_ALIGN(hdrsz);
338 hdrgap = fileofs - DEV_ALIGN(hdrsz);
340 /* Determine dump offset on device. */
341 if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
345 dumplo = di->mediaoffset + di->mediasize - dumpsize;
346 dumplo -= sizeof(kdh) * 2;
348 mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_ARM_VERSION, dumpsize, di->blocksize);
350 printf("Dumping %llu MB (%d chunks)\n", (long long)dumpsize >> 20,
354 error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
357 dumplo += sizeof(kdh);
359 /* Dump ELF header */
360 error = buf_write(di, (char*)&ehdr, sizeof(ehdr));
364 /* Dump program headers */
365 error = foreach_chunk(cb_dumphdr, di);
367 error = dump_os_header(di);
373 * All headers are written using blocked I/O, so we know the
374 * current offset is (still) block aligned. Skip the alignement
375 * in the file to have the segment contents aligned at page
376 * boundary. We cannot use MD_ALIGN on dumplo, because we don't
377 * care and may very well be unaligned within the dump device.
381 /* Dump memory chunks (updates dumplo) */
382 error = foreach_chunk(cb_dumpdata, di);
387 error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
391 /* Signal completion, signoff and exit stage left. */
392 dump_write(di, NULL, 0, 0, 0);
393 printf("\nDump complete\n");
400 if (error == ECANCELED)
401 printf("\nDump aborted\n");
402 else if (error == ENOSPC)
403 printf("\nDump failed. Partition too small.\n");
405 printf("\n** DUMP FAILED (ERROR %d) **\n", error);