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: releng/10.0/sys/mips/mips/dump_machdep.c 224845 2011-08-13 17:17:04Z attilio $");
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/cache.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 pa;
165 uint32_t pgs;
166 size_t counter, sz, chunk;
167 int c, error;
168
169 error = 0; /* catch case in which chunk size is 0 */
170 counter = 0;
171 pgs = mdp->md_size / PAGE_SIZE;
172 pa = mdp->md_start;
173
174 printf(" chunk %d: %dMB (%d pages)", seqnr, pgs * PAGE_SIZE / (
175 1024*1024), pgs);
176
177 /* Make sure we write coherent datas. */
178 mips_dcache_wbinv_all();
179 while (pgs) {
180 chunk = pgs;
181 if (chunk > MAXDUMPPGS)
182 chunk = MAXDUMPPGS;
183 sz = chunk << PAGE_SHIFT;
184 counter += sz;
185 if (counter >> 24) {
186 printf(" %d", pgs * PAGE_SIZE);
187 counter &= (1<<24) - 1;
188 }
189
190 #ifdef SW_WATCHDOG
191 wdog_kern_pat(WD_LASTVAL);
192 #endif
193 error = dump_write(di, (void *)(intptr_t)(pa),0, dumplo, sz); /* XXX fix PA */
194 if (error)
195 break;
196 dumplo += sz;
197 pgs -= chunk;
198 pa += sz;
199
200 /* Check for user abort. */
201 c = cncheckc();
202 if (c == 0x03)
203 return (ECANCELED);
204 if (c != -1)
205 printf(" (CTRL-C to abort) ");
206 }
207 printf(" ... %s\n", (error) ? "fail" : "ok");
208 return (error);
209 }
210
211 static int
212 cb_dumphdr(struct md_pa *mdp, int seqnr, void *arg)
213 {
214 struct dumperinfo *di = (struct dumperinfo*)arg;
215 Elf_Phdr phdr;
216 uint64_t size;
217 int error;
218
219 size = mdp->md_size;
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;
227 phdr.p_memsz = size;
228 phdr.p_align = PAGE_SIZE;
229
230 error = buf_write(di, (char*)&phdr, sizeof(phdr));
231 fileofs += phdr.p_filesz;
232 return (error);
233 }
234
235 static int
236 cb_size(struct md_pa *mdp, int seqnr, void *arg)
237 {
238 uint32_t *sz = (uint32_t*)arg;
239
240 *sz += (uint32_t)mdp->md_size;
241 return (0);
242 }
243
244 static int
245 foreach_chunk(callback_t cb, void *arg)
246 {
247 struct md_pa *mdp;
248 int error, seqnr;
249
250 seqnr = 0;
251 mdp = md_pa_first();
252 while (mdp != NULL) {
253 error = (*cb)(mdp, seqnr++, arg);
254 if (error)
255 return (-error);
256 mdp = md_pa_next(mdp);
257 }
258 return (seqnr);
259 }
260
261 void
262 dumpsys(struct dumperinfo *di)
263 {
264 Elf_Ehdr ehdr;
265 uint32_t dumpsize;
266 off_t hdrgap;
267 size_t hdrsz;
268 int error;
269
270 if (do_minidump) {
271 minidumpsys(di);
272 return;
273 }
274
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;
283 #else
284 ehdr.e_ident[EI_DATA] = ELFDATA2MSB;
285 #endif
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);
291 ehdr.e_flags = 0;
292 ehdr.e_ehsize = sizeof(ehdr);
293 ehdr.e_phentsize = sizeof(Elf_Phdr);
294 ehdr.e_shentsize = sizeof(Elf_Shdr);
295
296 md_pa_init();
297
298 /* Calculate dump size. */
299 dumpsize = 0L;
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);
303 dumpsize += fileofs;
304 hdrgap = fileofs - DEV_ALIGN(hdrsz);
305
306 /* Determine dump offset on device. */
307 if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
308 error = ENOSPC;
309 goto fail;
310 }
311 dumplo = di->mediaoffset + di->mediasize - dumpsize;
312 dumplo -= sizeof(kdh) * 2;
313
314 mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_MIPS_VERSION, dumpsize, di->blocksize);
315
316 printf("Dumping %llu MB (%d chunks)\n", (long long)dumpsize >> 20,
317 ehdr.e_phnum);
318
319 /* Dump leader */
320 error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
321 if (error)
322 goto fail;
323 dumplo += sizeof(kdh);
324
325 /* Dump ELF header */
326 error = buf_write(di, (char*)&ehdr, sizeof(ehdr));
327 if (error)
328 goto fail;
329
330 /* Dump program headers */
331 error = foreach_chunk(cb_dumphdr, di);
332 if (error < 0)
333 goto fail;
334 buf_flush(di);
335
336 /*
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.
342 */
343 dumplo += hdrgap;
344
345 /* Dump memory chunks (updates dumplo) */
346 error = foreach_chunk(cb_dumpdata, di);
347 if (error < 0)
348 goto fail;
349
350 /* Dump trailer */
351 error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
352 if (error)
353 goto fail;
354
355 /* Signal completion, signoff and exit stage left. */
356 dump_write(di, NULL, 0, 0, 0);
357 printf("\nDump complete\n");
358 return;
359
360 fail:
361 if (error < 0)
362 error = -error;
363
364 if (error == ECANCELED)
365 printf("\nDump aborted\n");
366 else if (error == ENOSPC)
367 printf("\nDump failed. Partition too small.\n");
368 else
369 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
370 }
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