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mm-only debug patch...
[mmotm.git] / fs / proc / vmcore.c
blob0872afa58d3987682bbdb4afdfdf5e24a95669f7
1 /*
2 * fs/proc/vmcore.c Interface for accessing the crash
3 * dump from the system's previous life.
4 * Heavily borrowed from fs/proc/kcore.c
5 * Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
6 * Copyright (C) IBM Corporation, 2004. All rights reserved
7 *
8 */
9
10 #include <linux/mm.h>
11 #include <linux/proc_fs.h>
12 #include <linux/user.h>
13 #include <linux/elf.h>
14 #include <linux/elfcore.h>
15 #include <linux/highmem.h>
16 #include <linux/bootmem.h>
17 #include <linux/init.h>
18 #include <linux/crash_dump.h>
19 #include <linux/list.h>
20 #include <asm/uaccess.h>
21 #include <asm/io.h>
22
23 /* List representing chunks of contiguous memory areas and their offsets in
24 * vmcore file.
25 */
26 static LIST_HEAD(vmcore_list);
27
28 /* Stores the pointer to the buffer containing kernel elf core headers. */
29 static char *elfcorebuf;
30 static size_t elfcorebuf_sz;
31
32 /* Total size of vmcore file. */
33 static u64 vmcore_size;
34
35 static struct proc_dir_entry *proc_vmcore = NULL;
36
37 /* Reads a page from the oldmem device from given offset. */
38 static ssize_t read_from_oldmem(char *buf, size_t count,
39 u64 *ppos, int userbuf)
40 {
41 unsigned long pfn, offset;
42 size_t nr_bytes;
43 ssize_t read = 0, tmp;
44
45 if (!count)
46 return 0;
47
48 offset = (unsigned long)(*ppos % PAGE_SIZE);
49 pfn = (unsigned long)(*ppos / PAGE_SIZE);
50
51 do {
52 if (count > (PAGE_SIZE - offset))
53 nr_bytes = PAGE_SIZE - offset;
54 else
55 nr_bytes = count;
56
57 tmp = copy_oldmem_page(pfn, buf, nr_bytes, offset, userbuf);
58 if (tmp < 0)
59 return tmp;
60 *ppos += nr_bytes;
61 count -= nr_bytes;
62 buf += nr_bytes;
63 read += nr_bytes;
64 ++pfn;
65 offset = 0;
66 } while (count);
67
68 return read;
69 }
70
71 /* Maps vmcore file offset to respective physical address in memroy. */
72 static u64 map_offset_to_paddr(loff_t offset, struct list_head *vc_list,
73 struct vmcore **m_ptr)
74 {
75 struct vmcore *m;
76 u64 paddr;
77
78 list_for_each_entry(m, vc_list, list) {
79 u64 start, end;
80 start = m->offset;
81 end = m->offset + m->size - 1;
82 if (offset >= start && offset <= end) {
83 paddr = m->paddr + offset - start;
84 *m_ptr = m;
85 return paddr;
86 }
87 }
88 *m_ptr = NULL;
89 return 0;
90 }
91
92 /* Read from the ELF header and then the crash dump. On error, negative value is
93 * returned otherwise number of bytes read are returned.
94 */
95 static ssize_t read_vmcore(struct file *file, char __user *buffer,
96 size_t buflen, loff_t *fpos)
97 {
98 ssize_t acc = 0, tmp;
99 size_t tsz;
100 u64 start, nr_bytes;
101 struct vmcore *curr_m = NULL;
102
103 if (buflen == 0 || *fpos >= vmcore_size)
104 return 0;
105
106 /* trim buflen to not go beyond EOF */
107 if (buflen > vmcore_size - *fpos)
108 buflen = vmcore_size - *fpos;
109
110 /* Read ELF core header */
111 if (*fpos < elfcorebuf_sz) {
112 tsz = elfcorebuf_sz - *fpos;
113 if (buflen < tsz)
114 tsz = buflen;
115 if (copy_to_user(buffer, elfcorebuf + *fpos, tsz))
116 return -EFAULT;
117 buflen -= tsz;
118 *fpos += tsz;
119 buffer += tsz;
120 acc += tsz;
121
122 /* leave now if filled buffer already */
123 if (buflen == 0)
124 return acc;
125 }
126
127 start = map_offset_to_paddr(*fpos, &vmcore_list, &curr_m);
128 if (!curr_m)
129 return -EINVAL;
130 if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
131 tsz = buflen;
132
133 /* Calculate left bytes in current memory segment. */
134 nr_bytes = (curr_m->size - (start - curr_m->paddr));
135 if (tsz > nr_bytes)
136 tsz = nr_bytes;
137
138 while (buflen) {
139 tmp = read_from_oldmem(buffer, tsz, &start, 1);
140 if (tmp < 0)
141 return tmp;
142 buflen -= tsz;
143 *fpos += tsz;
144 buffer += tsz;
145 acc += tsz;
146 if (start >= (curr_m->paddr + curr_m->size)) {
147 if (curr_m->list.next == &vmcore_list)
148 return acc; /*EOF*/
149 curr_m = list_entry(curr_m->list.next,
150 struct vmcore, list);
151 start = curr_m->paddr;
152 }
153 if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
154 tsz = buflen;
155 /* Calculate left bytes in current memory segment. */
156 nr_bytes = (curr_m->size - (start - curr_m->paddr));
157 if (tsz > nr_bytes)
158 tsz = nr_bytes;
159 }
160 return acc;
161 }
162
163 static const struct file_operations proc_vmcore_operations = {
164 .read = read_vmcore,
165 };
166
167 static struct vmcore* __init get_new_element(void)
168 {
169 return kzalloc(sizeof(struct vmcore), GFP_KERNEL);
170 }
171
172 static u64 __init get_vmcore_size_elf64(char *elfptr)
173 {
174 int i;
175 u64 size;
176 Elf64_Ehdr *ehdr_ptr;
177 Elf64_Phdr *phdr_ptr;
178
179 ehdr_ptr = (Elf64_Ehdr *)elfptr;
180 phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr));
181 size = sizeof(Elf64_Ehdr) + ((ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr));
182 for (i = 0; i < ehdr_ptr->e_phnum; i++) {
183 size += phdr_ptr->p_memsz;
184 phdr_ptr++;
185 }
186 return size;
187 }
188
189 static u64 __init get_vmcore_size_elf32(char *elfptr)
190 {
191 int i;
192 u64 size;
193 Elf32_Ehdr *ehdr_ptr;
194 Elf32_Phdr *phdr_ptr;
195
196 ehdr_ptr = (Elf32_Ehdr *)elfptr;
197 phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr));
198 size = sizeof(Elf32_Ehdr) + ((ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr));
199 for (i = 0; i < ehdr_ptr->e_phnum; i++) {
200 size += phdr_ptr->p_memsz;
201 phdr_ptr++;
202 }
203 return size;
204 }
205
206 /* Merges all the PT_NOTE headers into one. */
207 static int __init merge_note_headers_elf64(char *elfptr, size_t *elfsz,
208 struct list_head *vc_list)
209 {
210 int i, nr_ptnote=0, rc=0;
211 char *tmp;
212 Elf64_Ehdr *ehdr_ptr;
213 Elf64_Phdr phdr, *phdr_ptr;
214 Elf64_Nhdr *nhdr_ptr;
215 u64 phdr_sz = 0, note_off;
216
217 ehdr_ptr = (Elf64_Ehdr *)elfptr;
218 phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr));
219 for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
220 int j;
221 void *notes_section;
222 struct vmcore *new;
223 u64 offset, max_sz, sz, real_sz = 0;
224 if (phdr_ptr->p_type != PT_NOTE)
225 continue;
226 nr_ptnote++;
227 max_sz = phdr_ptr->p_memsz;
228 offset = phdr_ptr->p_offset;
229 notes_section = kmalloc(max_sz, GFP_KERNEL);
230 if (!notes_section)
231 return -ENOMEM;
232 rc = read_from_oldmem(notes_section, max_sz, &offset, 0);
233 if (rc < 0) {
234 kfree(notes_section);
235 return rc;
236 }
237 nhdr_ptr = notes_section;
238 for (j = 0; j < max_sz; j += sz) {
239 if (nhdr_ptr->n_namesz == 0)
240 break;
241 sz = sizeof(Elf64_Nhdr) +
242 ((nhdr_ptr->n_namesz + 3) & ~3) +
243 ((nhdr_ptr->n_descsz + 3) & ~3);
244 real_sz += sz;
245 nhdr_ptr = (Elf64_Nhdr*)((char*)nhdr_ptr + sz);
246 }
247
248 /* Add this contiguous chunk of notes section to vmcore list.*/
249 new = get_new_element();
250 if (!new) {
251 kfree(notes_section);
252 return -ENOMEM;
253 }
254 new->paddr = phdr_ptr->p_offset;
255 new->size = real_sz;
256 list_add_tail(&new->list, vc_list);
257 phdr_sz += real_sz;
258 kfree(notes_section);
259 }
260
261 /* Prepare merged PT_NOTE program header. */
262 phdr.p_type = PT_NOTE;
263 phdr.p_flags = 0;
264 note_off = sizeof(Elf64_Ehdr) +
265 (ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf64_Phdr);
266 phdr.p_offset = note_off;
267 phdr.p_vaddr = phdr.p_paddr = 0;
268 phdr.p_filesz = phdr.p_memsz = phdr_sz;
269 phdr.p_align = 0;
270
271 /* Add merged PT_NOTE program header*/
272 tmp = elfptr + sizeof(Elf64_Ehdr);
273 memcpy(tmp, &phdr, sizeof(phdr));
274 tmp += sizeof(phdr);
275
276 /* Remove unwanted PT_NOTE program headers. */
277 i = (nr_ptnote - 1) * sizeof(Elf64_Phdr);
278 *elfsz = *elfsz - i;
279 memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf64_Ehdr)-sizeof(Elf64_Phdr)));
280
281 /* Modify e_phnum to reflect merged headers. */
282 ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1;
283
284 return 0;
285 }
286
287 /* Merges all the PT_NOTE headers into one. */
288 static int __init merge_note_headers_elf32(char *elfptr, size_t *elfsz,
289 struct list_head *vc_list)
290 {
291 int i, nr_ptnote=0, rc=0;
292 char *tmp;
293 Elf32_Ehdr *ehdr_ptr;
294 Elf32_Phdr phdr, *phdr_ptr;
295 Elf32_Nhdr *nhdr_ptr;
296 u64 phdr_sz = 0, note_off;
297
298 ehdr_ptr = (Elf32_Ehdr *)elfptr;
299 phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr));
300 for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
301 int j;
302 void *notes_section;
303 struct vmcore *new;
304 u64 offset, max_sz, sz, real_sz = 0;
305 if (phdr_ptr->p_type != PT_NOTE)
306 continue;
307 nr_ptnote++;
308 max_sz = phdr_ptr->p_memsz;
309 offset = phdr_ptr->p_offset;
310 notes_section = kmalloc(max_sz, GFP_KERNEL);
311 if (!notes_section)
312 return -ENOMEM;
313 rc = read_from_oldmem(notes_section, max_sz, &offset, 0);
314 if (rc < 0) {
315 kfree(notes_section);
316 return rc;
317 }
318 nhdr_ptr = notes_section;
319 for (j = 0; j < max_sz; j += sz) {
320 if (nhdr_ptr->n_namesz == 0)
321 break;
322 sz = sizeof(Elf32_Nhdr) +
323 ((nhdr_ptr->n_namesz + 3) & ~3) +
324 ((nhdr_ptr->n_descsz + 3) & ~3);
325 real_sz += sz;
326 nhdr_ptr = (Elf32_Nhdr*)((char*)nhdr_ptr + sz);
327 }
328
329 /* Add this contiguous chunk of notes section to vmcore list.*/
330 new = get_new_element();
331 if (!new) {
332 kfree(notes_section);
333 return -ENOMEM;
334 }
335 new->paddr = phdr_ptr->p_offset;
336 new->size = real_sz;
337 list_add_tail(&new->list, vc_list);
338 phdr_sz += real_sz;
339 kfree(notes_section);
340 }
341
342 /* Prepare merged PT_NOTE program header. */
343 phdr.p_type = PT_NOTE;
344 phdr.p_flags = 0;
345 note_off = sizeof(Elf32_Ehdr) +
346 (ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf32_Phdr);
347 phdr.p_offset = note_off;
348 phdr.p_vaddr = phdr.p_paddr = 0;
349 phdr.p_filesz = phdr.p_memsz = phdr_sz;
350 phdr.p_align = 0;
351
352 /* Add merged PT_NOTE program header*/
353 tmp = elfptr + sizeof(Elf32_Ehdr);
354 memcpy(tmp, &phdr, sizeof(phdr));
355 tmp += sizeof(phdr);
356
357 /* Remove unwanted PT_NOTE program headers. */
358 i = (nr_ptnote - 1) * sizeof(Elf32_Phdr);
359 *elfsz = *elfsz - i;
360 memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf32_Ehdr)-sizeof(Elf32_Phdr)));
361
362 /* Modify e_phnum to reflect merged headers. */
363 ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1;
364
365 return 0;
366 }
367
368 /* Add memory chunks represented by program headers to vmcore list. Also update
369 * the new offset fields of exported program headers. */
370 static int __init process_ptload_program_headers_elf64(char *elfptr,
371 size_t elfsz,
372 struct list_head *vc_list)
373 {
374 int i;
375 Elf64_Ehdr *ehdr_ptr;
376 Elf64_Phdr *phdr_ptr;
377 loff_t vmcore_off;
378 struct vmcore *new;
379
380 ehdr_ptr = (Elf64_Ehdr *)elfptr;
381 phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr)); /* PT_NOTE hdr */
382
383 /* First program header is PT_NOTE header. */
384 vmcore_off = sizeof(Elf64_Ehdr) +
385 (ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr) +
386 phdr_ptr->p_memsz; /* Note sections */
387
388 for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
389 if (phdr_ptr->p_type != PT_LOAD)
390 continue;
391
392 /* Add this contiguous chunk of memory to vmcore list.*/
393 new = get_new_element();
394 if (!new)
395 return -ENOMEM;
396 new->paddr = phdr_ptr->p_offset;
397 new->size = phdr_ptr->p_memsz;
398 list_add_tail(&new->list, vc_list);
399
400 /* Update the program header offset. */
401 phdr_ptr->p_offset = vmcore_off;
402 vmcore_off = vmcore_off + phdr_ptr->p_memsz;
403 }
404 return 0;
405 }
406
407 static int __init process_ptload_program_headers_elf32(char *elfptr,
408 size_t elfsz,
409 struct list_head *vc_list)
410 {
411 int i;
412 Elf32_Ehdr *ehdr_ptr;
413 Elf32_Phdr *phdr_ptr;
414 loff_t vmcore_off;
415 struct vmcore *new;
416
417 ehdr_ptr = (Elf32_Ehdr *)elfptr;
418 phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr)); /* PT_NOTE hdr */
419
420 /* First program header is PT_NOTE header. */
421 vmcore_off = sizeof(Elf32_Ehdr) +
422 (ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr) +
423 phdr_ptr->p_memsz; /* Note sections */
424
425 for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
426 if (phdr_ptr->p_type != PT_LOAD)
427 continue;
428
429 /* Add this contiguous chunk of memory to vmcore list.*/
430 new = get_new_element();
431 if (!new)
432 return -ENOMEM;
433 new->paddr = phdr_ptr->p_offset;
434 new->size = phdr_ptr->p_memsz;
435 list_add_tail(&new->list, vc_list);
436
437 /* Update the program header offset */
438 phdr_ptr->p_offset = vmcore_off;
439 vmcore_off = vmcore_off + phdr_ptr->p_memsz;
440 }
441 return 0;
442 }
443
444 /* Sets offset fields of vmcore elements. */
445 static void __init set_vmcore_list_offsets_elf64(char *elfptr,
446 struct list_head *vc_list)
447 {
448 loff_t vmcore_off;
449 Elf64_Ehdr *ehdr_ptr;
450 struct vmcore *m;
451
452 ehdr_ptr = (Elf64_Ehdr *)elfptr;
453
454 /* Skip Elf header and program headers. */
455 vmcore_off = sizeof(Elf64_Ehdr) +
456 (ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr);
457
458 list_for_each_entry(m, vc_list, list) {
459 m->offset = vmcore_off;
460 vmcore_off += m->size;
461 }
462 }
463
464 /* Sets offset fields of vmcore elements. */
465 static void __init set_vmcore_list_offsets_elf32(char *elfptr,
466 struct list_head *vc_list)
467 {
468 loff_t vmcore_off;
469 Elf32_Ehdr *ehdr_ptr;
470 struct vmcore *m;
471
472 ehdr_ptr = (Elf32_Ehdr *)elfptr;
473
474 /* Skip Elf header and program headers. */
475 vmcore_off = sizeof(Elf32_Ehdr) +
476 (ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr);
477
478 list_for_each_entry(m, vc_list, list) {
479 m->offset = vmcore_off;
480 vmcore_off += m->size;
481 }
482 }
483
484 static int __init parse_crash_elf64_headers(void)
485 {
486 int rc=0;
487 Elf64_Ehdr ehdr;
488 u64 addr;
489
490 addr = elfcorehdr_addr;
491
492 /* Read Elf header */
493 rc = read_from_oldmem((char*)&ehdr, sizeof(Elf64_Ehdr), &addr, 0);
494 if (rc < 0)
495 return rc;
496
497 /* Do some basic Verification. */
498 if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 ||
499 (ehdr.e_type != ET_CORE) ||
500 !vmcore_elf_check_arch(&ehdr) ||
501 ehdr.e_ident[EI_CLASS] != ELFCLASS64 ||
502 ehdr.e_ident[EI_VERSION] != EV_CURRENT ||
503 ehdr.e_version != EV_CURRENT ||
504 ehdr.e_ehsize != sizeof(Elf64_Ehdr) ||
505 ehdr.e_phentsize != sizeof(Elf64_Phdr) ||
506 ehdr.e_phnum == 0) {
507 printk(KERN_WARNING "Warning: Core image elf header is not"
508 "sane\n");
509 return -EINVAL;
510 }
511
512 /* Read in all elf headers. */
513 elfcorebuf_sz = sizeof(Elf64_Ehdr) + ehdr.e_phnum * sizeof(Elf64_Phdr);
514 elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
515 if (!elfcorebuf)
516 return -ENOMEM;
517 addr = elfcorehdr_addr;
518 rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, &addr, 0);
519 if (rc < 0) {
520 kfree(elfcorebuf);
521 return rc;
522 }
523
524 /* Merge all PT_NOTE headers into one. */
525 rc = merge_note_headers_elf64(elfcorebuf, &elfcorebuf_sz, &vmcore_list);
526 if (rc) {
527 kfree(elfcorebuf);
528 return rc;
529 }
530 rc = process_ptload_program_headers_elf64(elfcorebuf, elfcorebuf_sz,
531 &vmcore_list);
532 if (rc) {
533 kfree(elfcorebuf);
534 return rc;
535 }
536 set_vmcore_list_offsets_elf64(elfcorebuf, &vmcore_list);
537 return 0;
538 }
539
540 static int __init parse_crash_elf32_headers(void)
541 {
542 int rc=0;
543 Elf32_Ehdr ehdr;
544 u64 addr;
545
546 addr = elfcorehdr_addr;
547
548 /* Read Elf header */
549 rc = read_from_oldmem((char*)&ehdr, sizeof(Elf32_Ehdr), &addr, 0);
550 if (rc < 0)
551 return rc;
552
553 /* Do some basic Verification. */
554 if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 ||
555 (ehdr.e_type != ET_CORE) ||
556 !elf_check_arch(&ehdr) ||
557 ehdr.e_ident[EI_CLASS] != ELFCLASS32||
558 ehdr.e_ident[EI_VERSION] != EV_CURRENT ||
559 ehdr.e_version != EV_CURRENT ||
560 ehdr.e_ehsize != sizeof(Elf32_Ehdr) ||
561 ehdr.e_phentsize != sizeof(Elf32_Phdr) ||
562 ehdr.e_phnum == 0) {
563 printk(KERN_WARNING "Warning: Core image elf header is not"
564 "sane\n");
565 return -EINVAL;
566 }
567
568 /* Read in all elf headers. */
569 elfcorebuf_sz = sizeof(Elf32_Ehdr) + ehdr.e_phnum * sizeof(Elf32_Phdr);
570 elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
571 if (!elfcorebuf)
572 return -ENOMEM;
573 addr = elfcorehdr_addr;
574 rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, &addr, 0);
575 if (rc < 0) {
576 kfree(elfcorebuf);
577 return rc;
578 }
579
580 /* Merge all PT_NOTE headers into one. */
581 rc = merge_note_headers_elf32(elfcorebuf, &elfcorebuf_sz, &vmcore_list);
582 if (rc) {
583 kfree(elfcorebuf);
584 return rc;
585 }
586 rc = process_ptload_program_headers_elf32(elfcorebuf, elfcorebuf_sz,
587 &vmcore_list);
588 if (rc) {
589 kfree(elfcorebuf);
590 return rc;
591 }
592 set_vmcore_list_offsets_elf32(elfcorebuf, &vmcore_list);
593 return 0;
594 }
595
596 static int __init parse_crash_elf_headers(void)
597 {
598 unsigned char e_ident[EI_NIDENT];
599 u64 addr;
600 int rc=0;
601
602 addr = elfcorehdr_addr;
603 rc = read_from_oldmem(e_ident, EI_NIDENT, &addr, 0);
604 if (rc < 0)
605 return rc;
606 if (memcmp(e_ident, ELFMAG, SELFMAG) != 0) {
607 printk(KERN_WARNING "Warning: Core image elf header"
608 " not found\n");
609 return -EINVAL;
610 }
611
612 if (e_ident[EI_CLASS] == ELFCLASS64) {
613 rc = parse_crash_elf64_headers();
614 if (rc)
615 return rc;
616
617 /* Determine vmcore size. */
618 vmcore_size = get_vmcore_size_elf64(elfcorebuf);
619 } else if (e_ident[EI_CLASS] == ELFCLASS32) {
620 rc = parse_crash_elf32_headers();
621 if (rc)
622 return rc;
623
624 /* Determine vmcore size. */
625 vmcore_size = get_vmcore_size_elf32(elfcorebuf);
626 } else {
627 printk(KERN_WARNING "Warning: Core image elf header is not"
628 " sane\n");
629 return -EINVAL;
630 }
631 return 0;
632 }
633
634 /* Init function for vmcore module. */
635 static int __init vmcore_init(void)
636 {
637 int rc = 0;
638
639 /* If elfcorehdr= has been passed in cmdline, then capture the dump.*/
640 if (!(is_vmcore_usable()))
641 return rc;
642 rc = parse_crash_elf_headers();
643 if (rc) {
644 printk(KERN_WARNING "Kdump: vmcore not initialized\n");
645 return rc;
646 }
647
648 proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
649 if (proc_vmcore)
650 proc_vmcore->size = vmcore_size;
651 return 0;
652 }
653 module_init(vmcore_init)
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