ia64/linux-2.6.18-xen.hg

view fs/proc/vmcore.c @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 9d24e876046f
children
line source
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 */
10 #include <linux/mm.h>
11 #include <linux/proc_fs.h>
12 #include <linux/user.h>
13 #include <linux/a.out.h>
14 #include <linux/elf.h>
15 #include <linux/elfcore.h>
16 #include <linux/highmem.h>
17 #include <linux/bootmem.h>
18 #include <linux/init.h>
19 #include <linux/crash_dump.h>
20 #include <linux/list.h>
21 #include <asm/uaccess.h>
22 #include <asm/io.h>
24 /* List representing chunks of contiguous memory areas and their offsets in
25 * vmcore file.
26 */
27 static LIST_HEAD(vmcore_list);
29 /* Stores the pointer to the buffer containing kernel elf core headers. */
30 static char *elfcorebuf;
31 static size_t elfcorebuf_sz;
33 /* Total size of vmcore file. */
34 static u64 vmcore_size;
36 /* Stores the physical address of elf header of crash image. */
37 unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
39 struct proc_dir_entry *proc_vmcore = NULL;
41 /* Reads a page from the oldmem device from given offset. */
42 static ssize_t read_from_oldmem(char *buf, size_t count,
43 u64 *ppos, int userbuf)
44 {
45 unsigned long pfn, offset;
46 size_t nr_bytes;
47 ssize_t read = 0, tmp;
49 if (!count)
50 return 0;
52 offset = (unsigned long)(*ppos % PAGE_SIZE);
53 pfn = (unsigned long)(*ppos / PAGE_SIZE);
54 if (pfn > saved_max_pfn)
55 return -EINVAL;
57 do {
58 if (count > (PAGE_SIZE - offset))
59 nr_bytes = PAGE_SIZE - offset;
60 else
61 nr_bytes = count;
63 tmp = copy_oldmem_page(pfn, buf, nr_bytes, offset, userbuf);
64 if (tmp < 0)
65 return tmp;
66 *ppos += nr_bytes;
67 count -= nr_bytes;
68 buf += nr_bytes;
69 read += nr_bytes;
70 ++pfn;
71 offset = 0;
72 } while (count);
74 return read;
75 }
77 /* Maps vmcore file offset to respective physical address in memroy. */
78 static u64 map_offset_to_paddr(loff_t offset, struct list_head *vc_list,
79 struct vmcore **m_ptr)
80 {
81 struct vmcore *m;
82 u64 paddr;
84 list_for_each_entry(m, vc_list, list) {
85 u64 start, end;
86 start = m->offset;
87 end = m->offset + m->size - 1;
88 if (offset >= start && offset <= end) {
89 paddr = m->paddr + offset - start;
90 *m_ptr = m;
91 return paddr;
92 }
93 }
94 *m_ptr = NULL;
95 return 0;
96 }
98 /* Read from the ELF header and then the crash dump. On error, negative value is
99 * returned otherwise number of bytes read are returned.
100 */
101 static ssize_t read_vmcore(struct file *file, char __user *buffer,
102 size_t buflen, loff_t *fpos)
103 {
104 ssize_t acc = 0, tmp;
105 size_t tsz;
106 u64 start, nr_bytes;
107 struct vmcore *curr_m = NULL;
109 if (buflen == 0 || *fpos >= vmcore_size)
110 return 0;
112 /* trim buflen to not go beyond EOF */
113 if (buflen > vmcore_size - *fpos)
114 buflen = vmcore_size - *fpos;
116 /* Read ELF core header */
117 if (*fpos < elfcorebuf_sz) {
118 tsz = elfcorebuf_sz - *fpos;
119 if (buflen < tsz)
120 tsz = buflen;
121 if (copy_to_user(buffer, elfcorebuf + *fpos, tsz))
122 return -EFAULT;
123 buflen -= tsz;
124 *fpos += tsz;
125 buffer += tsz;
126 acc += tsz;
128 /* leave now if filled buffer already */
129 if (buflen == 0)
130 return acc;
131 }
133 start = map_offset_to_paddr(*fpos, &vmcore_list, &curr_m);
134 if (!curr_m)
135 return -EINVAL;
136 if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
137 tsz = buflen;
139 /* Calculate left bytes in current memory segment. */
140 nr_bytes = (curr_m->size - (start - curr_m->paddr));
141 if (tsz > nr_bytes)
142 tsz = nr_bytes;
144 while (buflen) {
145 tmp = read_from_oldmem(buffer, tsz, &start, 1);
146 if (tmp < 0)
147 return tmp;
148 buflen -= tsz;
149 *fpos += tsz;
150 buffer += tsz;
151 acc += tsz;
152 if (start >= (curr_m->paddr + curr_m->size)) {
153 if (curr_m->list.next == &vmcore_list)
154 return acc; /*EOF*/
155 curr_m = list_entry(curr_m->list.next,
156 struct vmcore, list);
157 start = curr_m->paddr;
158 }
159 if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
160 tsz = buflen;
161 /* Calculate left bytes in current memory segment. */
162 nr_bytes = (curr_m->size - (start - curr_m->paddr));
163 if (tsz > nr_bytes)
164 tsz = nr_bytes;
165 }
166 return acc;
167 }
169 static int open_vmcore(struct inode *inode, struct file *filp)
170 {
171 return 0;
172 }
174 const struct file_operations proc_vmcore_operations = {
175 .read = read_vmcore,
176 .open = open_vmcore,
177 };
179 static struct vmcore* __init get_new_element(void)
180 {
181 struct vmcore *p;
183 p = kmalloc(sizeof(*p), GFP_KERNEL);
184 if (p)
185 memset(p, 0, sizeof(*p));
186 return p;
187 }
189 static u64 __init get_vmcore_size_elf64(char *elfptr)
190 {
191 int i;
192 u64 size;
193 Elf64_Ehdr *ehdr_ptr;
194 Elf64_Phdr *phdr_ptr;
196 ehdr_ptr = (Elf64_Ehdr *)elfptr;
197 phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr));
198 size = sizeof(Elf64_Ehdr) + ((ehdr_ptr->e_phnum) * sizeof(Elf64_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 }
206 static u64 __init get_vmcore_size_elf32(char *elfptr)
207 {
208 int i;
209 u64 size;
210 Elf32_Ehdr *ehdr_ptr;
211 Elf32_Phdr *phdr_ptr;
213 ehdr_ptr = (Elf32_Ehdr *)elfptr;
214 phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr));
215 size = sizeof(Elf32_Ehdr) + ((ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr));
216 for (i = 0; i < ehdr_ptr->e_phnum; i++) {
217 size += phdr_ptr->p_memsz;
218 phdr_ptr++;
219 }
220 return size;
221 }
223 /* Merges all the PT_NOTE headers into one. */
224 static int __init merge_note_headers_elf64(char *elfptr, size_t *elfsz,
225 struct list_head *vc_list)
226 {
227 int i, nr_ptnote=0, rc=0;
228 char *tmp;
229 Elf64_Ehdr *ehdr_ptr;
230 Elf64_Phdr phdr, *phdr_ptr;
231 Elf64_Nhdr *nhdr_ptr;
232 u64 phdr_sz = 0, note_off;
234 ehdr_ptr = (Elf64_Ehdr *)elfptr;
235 phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr));
236 for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
237 int j;
238 void *notes_section;
239 struct vmcore *new;
240 u64 offset, max_sz, sz, real_sz = 0;
241 if (phdr_ptr->p_type != PT_NOTE)
242 continue;
243 nr_ptnote++;
244 max_sz = phdr_ptr->p_memsz;
245 offset = phdr_ptr->p_offset;
246 notes_section = kmalloc(max_sz, GFP_KERNEL);
247 if (!notes_section)
248 return -ENOMEM;
249 rc = read_from_oldmem(notes_section, max_sz, &offset, 0);
250 if (rc < 0) {
251 kfree(notes_section);
252 return rc;
253 }
254 nhdr_ptr = notes_section;
255 for (j = 0; j < max_sz; j += sz) {
256 if (nhdr_ptr->n_namesz == 0)
257 break;
258 sz = sizeof(Elf64_Nhdr) +
259 ((nhdr_ptr->n_namesz + 3) & ~3) +
260 ((nhdr_ptr->n_descsz + 3) & ~3);
261 real_sz += sz;
262 nhdr_ptr = (Elf64_Nhdr*)((char*)nhdr_ptr + sz);
263 }
265 /* Add this contiguous chunk of notes section to vmcore list.*/
266 new = get_new_element();
267 if (!new) {
268 kfree(notes_section);
269 return -ENOMEM;
270 }
271 new->paddr = phdr_ptr->p_offset;
272 new->size = real_sz;
273 list_add_tail(&new->list, vc_list);
274 phdr_sz += real_sz;
275 kfree(notes_section);
276 }
278 /* Prepare merged PT_NOTE program header. */
279 phdr.p_type = PT_NOTE;
280 phdr.p_flags = 0;
281 note_off = sizeof(Elf64_Ehdr) +
282 (ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf64_Phdr);
283 phdr.p_offset = note_off;
284 phdr.p_vaddr = phdr.p_paddr = 0;
285 phdr.p_filesz = phdr.p_memsz = phdr_sz;
286 phdr.p_align = 0;
288 /* Add merged PT_NOTE program header*/
289 tmp = elfptr + sizeof(Elf64_Ehdr);
290 memcpy(tmp, &phdr, sizeof(phdr));
291 tmp += sizeof(phdr);
293 /* Remove unwanted PT_NOTE program headers. */
294 i = (nr_ptnote - 1) * sizeof(Elf64_Phdr);
295 *elfsz = *elfsz - i;
296 memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf64_Ehdr)-sizeof(Elf64_Phdr)));
298 /* Modify e_phnum to reflect merged headers. */
299 ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1;
301 return 0;
302 }
304 /* Merges all the PT_NOTE headers into one. */
305 static int __init merge_note_headers_elf32(char *elfptr, size_t *elfsz,
306 struct list_head *vc_list)
307 {
308 int i, nr_ptnote=0, rc=0;
309 char *tmp;
310 Elf32_Ehdr *ehdr_ptr;
311 Elf32_Phdr phdr, *phdr_ptr;
312 Elf32_Nhdr *nhdr_ptr;
313 u64 phdr_sz = 0, note_off;
315 ehdr_ptr = (Elf32_Ehdr *)elfptr;
316 phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr));
317 for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
318 int j;
319 void *notes_section;
320 struct vmcore *new;
321 u64 offset, max_sz, sz, real_sz = 0;
322 if (phdr_ptr->p_type != PT_NOTE)
323 continue;
324 nr_ptnote++;
325 max_sz = phdr_ptr->p_memsz;
326 offset = phdr_ptr->p_offset;
327 notes_section = kmalloc(max_sz, GFP_KERNEL);
328 if (!notes_section)
329 return -ENOMEM;
330 rc = read_from_oldmem(notes_section, max_sz, &offset, 0);
331 if (rc < 0) {
332 kfree(notes_section);
333 return rc;
334 }
335 nhdr_ptr = notes_section;
336 for (j = 0; j < max_sz; j += sz) {
337 if (nhdr_ptr->n_namesz == 0)
338 break;
339 sz = sizeof(Elf32_Nhdr) +
340 ((nhdr_ptr->n_namesz + 3) & ~3) +
341 ((nhdr_ptr->n_descsz + 3) & ~3);
342 real_sz += sz;
343 nhdr_ptr = (Elf32_Nhdr*)((char*)nhdr_ptr + sz);
344 }
346 /* Add this contiguous chunk of notes section to vmcore list.*/
347 new = get_new_element();
348 if (!new) {
349 kfree(notes_section);
350 return -ENOMEM;
351 }
352 new->paddr = phdr_ptr->p_offset;
353 new->size = real_sz;
354 list_add_tail(&new->list, vc_list);
355 phdr_sz += real_sz;
356 kfree(notes_section);
357 }
359 /* Prepare merged PT_NOTE program header. */
360 phdr.p_type = PT_NOTE;
361 phdr.p_flags = 0;
362 note_off = sizeof(Elf32_Ehdr) +
363 (ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf32_Phdr);
364 phdr.p_offset = note_off;
365 phdr.p_vaddr = phdr.p_paddr = 0;
366 phdr.p_filesz = phdr.p_memsz = phdr_sz;
367 phdr.p_align = 0;
369 /* Add merged PT_NOTE program header*/
370 tmp = elfptr + sizeof(Elf32_Ehdr);
371 memcpy(tmp, &phdr, sizeof(phdr));
372 tmp += sizeof(phdr);
374 /* Remove unwanted PT_NOTE program headers. */
375 i = (nr_ptnote - 1) * sizeof(Elf32_Phdr);
376 *elfsz = *elfsz - i;
377 memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf32_Ehdr)-sizeof(Elf32_Phdr)));
379 /* Modify e_phnum to reflect merged headers. */
380 ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1;
382 return 0;
383 }
385 /* Add memory chunks represented by program headers to vmcore list. Also update
386 * the new offset fields of exported program headers. */
387 static int __init process_ptload_program_headers_elf64(char *elfptr,
388 size_t elfsz,
389 struct list_head *vc_list)
390 {
391 int i;
392 Elf64_Ehdr *ehdr_ptr;
393 Elf64_Phdr *phdr_ptr;
394 loff_t vmcore_off;
395 struct vmcore *new;
397 ehdr_ptr = (Elf64_Ehdr *)elfptr;
398 phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr)); /* PT_NOTE hdr */
400 /* First program header is PT_NOTE header. */
401 vmcore_off = sizeof(Elf64_Ehdr) +
402 (ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr) +
403 phdr_ptr->p_memsz; /* Note sections */
405 for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
406 if (phdr_ptr->p_type != PT_LOAD)
407 continue;
409 /* Add this contiguous chunk of memory to vmcore list.*/
410 new = get_new_element();
411 if (!new)
412 return -ENOMEM;
413 new->paddr = phdr_ptr->p_offset;
414 new->size = phdr_ptr->p_memsz;
415 list_add_tail(&new->list, vc_list);
417 /* Update the program header offset. */
418 phdr_ptr->p_offset = vmcore_off;
419 vmcore_off = vmcore_off + phdr_ptr->p_memsz;
420 }
421 return 0;
422 }
424 static int __init process_ptload_program_headers_elf32(char *elfptr,
425 size_t elfsz,
426 struct list_head *vc_list)
427 {
428 int i;
429 Elf32_Ehdr *ehdr_ptr;
430 Elf32_Phdr *phdr_ptr;
431 loff_t vmcore_off;
432 struct vmcore *new;
434 ehdr_ptr = (Elf32_Ehdr *)elfptr;
435 phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr)); /* PT_NOTE hdr */
437 /* First program header is PT_NOTE header. */
438 vmcore_off = sizeof(Elf32_Ehdr) +
439 (ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr) +
440 phdr_ptr->p_memsz; /* Note sections */
442 for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
443 if (phdr_ptr->p_type != PT_LOAD)
444 continue;
446 /* Add this contiguous chunk of memory to vmcore list.*/
447 new = get_new_element();
448 if (!new)
449 return -ENOMEM;
450 new->paddr = phdr_ptr->p_offset;
451 new->size = phdr_ptr->p_memsz;
452 list_add_tail(&new->list, vc_list);
454 /* Update the program header offset */
455 phdr_ptr->p_offset = vmcore_off;
456 vmcore_off = vmcore_off + phdr_ptr->p_memsz;
457 }
458 return 0;
459 }
461 /* Sets offset fields of vmcore elements. */
462 static void __init set_vmcore_list_offsets_elf64(char *elfptr,
463 struct list_head *vc_list)
464 {
465 loff_t vmcore_off;
466 Elf64_Ehdr *ehdr_ptr;
467 struct vmcore *m;
469 ehdr_ptr = (Elf64_Ehdr *)elfptr;
471 /* Skip Elf header and program headers. */
472 vmcore_off = sizeof(Elf64_Ehdr) +
473 (ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr);
475 list_for_each_entry(m, vc_list, list) {
476 m->offset = vmcore_off;
477 vmcore_off += m->size;
478 }
479 }
481 /* Sets offset fields of vmcore elements. */
482 static void __init set_vmcore_list_offsets_elf32(char *elfptr,
483 struct list_head *vc_list)
484 {
485 loff_t vmcore_off;
486 Elf32_Ehdr *ehdr_ptr;
487 struct vmcore *m;
489 ehdr_ptr = (Elf32_Ehdr *)elfptr;
491 /* Skip Elf header and program headers. */
492 vmcore_off = sizeof(Elf32_Ehdr) +
493 (ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr);
495 list_for_each_entry(m, vc_list, list) {
496 m->offset = vmcore_off;
497 vmcore_off += m->size;
498 }
499 }
501 static int __init parse_crash_elf64_headers(void)
502 {
503 int rc=0;
504 Elf64_Ehdr ehdr;
505 u64 addr;
507 addr = elfcorehdr_addr;
509 /* Read Elf header */
510 rc = read_from_oldmem((char*)&ehdr, sizeof(Elf64_Ehdr), &addr, 0);
511 if (rc < 0)
512 return rc;
514 /* Do some basic Verification. */
515 if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 ||
516 (ehdr.e_type != ET_CORE) ||
517 !vmcore_elf_check_arch(&ehdr) ||
518 ehdr.e_ident[EI_CLASS] != ELFCLASS64 ||
519 ehdr.e_ident[EI_VERSION] != EV_CURRENT ||
520 ehdr.e_version != EV_CURRENT ||
521 ehdr.e_ehsize != sizeof(Elf64_Ehdr) ||
522 ehdr.e_phentsize != sizeof(Elf64_Phdr) ||
523 ehdr.e_phnum == 0) {
524 printk(KERN_WARNING "Warning: Core image elf header is not"
525 "sane\n");
526 return -EINVAL;
527 }
529 /* Read in all elf headers. */
530 elfcorebuf_sz = sizeof(Elf64_Ehdr) + ehdr.e_phnum * sizeof(Elf64_Phdr);
531 elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
532 if (!elfcorebuf)
533 return -ENOMEM;
534 addr = elfcorehdr_addr;
535 rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, &addr, 0);
536 if (rc < 0) {
537 kfree(elfcorebuf);
538 return rc;
539 }
541 /* Merge all PT_NOTE headers into one. */
542 rc = merge_note_headers_elf64(elfcorebuf, &elfcorebuf_sz, &vmcore_list);
543 if (rc) {
544 kfree(elfcorebuf);
545 return rc;
546 }
547 rc = process_ptload_program_headers_elf64(elfcorebuf, elfcorebuf_sz,
548 &vmcore_list);
549 if (rc) {
550 kfree(elfcorebuf);
551 return rc;
552 }
553 set_vmcore_list_offsets_elf64(elfcorebuf, &vmcore_list);
554 return 0;
555 }
557 static int __init parse_crash_elf32_headers(void)
558 {
559 int rc=0;
560 Elf32_Ehdr ehdr;
561 u64 addr;
563 addr = elfcorehdr_addr;
565 /* Read Elf header */
566 rc = read_from_oldmem((char*)&ehdr, sizeof(Elf32_Ehdr), &addr, 0);
567 if (rc < 0)
568 return rc;
570 /* Do some basic Verification. */
571 if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 ||
572 (ehdr.e_type != ET_CORE) ||
573 !elf_check_arch(&ehdr) ||
574 ehdr.e_ident[EI_CLASS] != ELFCLASS32||
575 ehdr.e_ident[EI_VERSION] != EV_CURRENT ||
576 ehdr.e_version != EV_CURRENT ||
577 ehdr.e_ehsize != sizeof(Elf32_Ehdr) ||
578 ehdr.e_phentsize != sizeof(Elf32_Phdr) ||
579 ehdr.e_phnum == 0) {
580 printk(KERN_WARNING "Warning: Core image elf header is not"
581 "sane\n");
582 return -EINVAL;
583 }
585 /* Read in all elf headers. */
586 elfcorebuf_sz = sizeof(Elf32_Ehdr) + ehdr.e_phnum * sizeof(Elf32_Phdr);
587 elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
588 if (!elfcorebuf)
589 return -ENOMEM;
590 addr = elfcorehdr_addr;
591 rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, &addr, 0);
592 if (rc < 0) {
593 kfree(elfcorebuf);
594 return rc;
595 }
597 /* Merge all PT_NOTE headers into one. */
598 rc = merge_note_headers_elf32(elfcorebuf, &elfcorebuf_sz, &vmcore_list);
599 if (rc) {
600 kfree(elfcorebuf);
601 return rc;
602 }
603 rc = process_ptload_program_headers_elf32(elfcorebuf, elfcorebuf_sz,
604 &vmcore_list);
605 if (rc) {
606 kfree(elfcorebuf);
607 return rc;
608 }
609 set_vmcore_list_offsets_elf32(elfcorebuf, &vmcore_list);
610 return 0;
611 }
613 static int __init parse_crash_elf_headers(void)
614 {
615 unsigned char e_ident[EI_NIDENT];
616 u64 addr;
617 int rc=0;
619 addr = elfcorehdr_addr;
620 rc = read_from_oldmem(e_ident, EI_NIDENT, &addr, 0);
621 if (rc < 0)
622 return rc;
623 if (memcmp(e_ident, ELFMAG, SELFMAG) != 0) {
624 printk(KERN_WARNING "Warning: Core image elf header"
625 " not found\n");
626 return -EINVAL;
627 }
629 if (e_ident[EI_CLASS] == ELFCLASS64) {
630 rc = parse_crash_elf64_headers();
631 if (rc)
632 return rc;
634 /* Determine vmcore size. */
635 vmcore_size = get_vmcore_size_elf64(elfcorebuf);
636 } else if (e_ident[EI_CLASS] == ELFCLASS32) {
637 rc = parse_crash_elf32_headers();
638 if (rc)
639 return rc;
641 /* Determine vmcore size. */
642 vmcore_size = get_vmcore_size_elf32(elfcorebuf);
643 } else {
644 printk(KERN_WARNING "Warning: Core image elf header is not"
645 " sane\n");
646 return -EINVAL;
647 }
648 return 0;
649 }
651 /* Init function for vmcore module. */
652 static int __init vmcore_init(void)
653 {
654 int rc = 0;
656 /* If elfcorehdr= has been passed in cmdline, then capture the dump.*/
657 if (!(elfcorehdr_addr < ELFCORE_ADDR_MAX))
658 return rc;
659 rc = parse_crash_elf_headers();
660 if (rc) {
661 printk(KERN_WARNING "Kdump: vmcore not initialized\n");
662 return rc;
663 }
665 /* Initialize /proc/vmcore size if proc is already up. */
666 if (proc_vmcore)
667 proc_vmcore->size = vmcore_size;
668 return 0;
669 }
670 module_init(vmcore_init)