[net-next-2.6.git] / fs / proc / vmcore.c

/*
 *	fs/proc/vmcore.c Interface for accessing the crash
 * 				 dump from the system's previous life.
 * 	Heavily borrowed from fs/proc/kcore.c
 *	Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
 *	Copyright (C) IBM Corporation, 2004. All rights reserved
 *
 */

#include <linux/mm.h>
#include <linux/proc_fs.h>
#include <linux/user.h>
#include <linux/elf.h>
#include <linux/elfcore.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/bootmem.h>
#include <linux/init.h>
#include <linux/crash_dump.h>
#include <linux/list.h>
#include <asm/uaccess.h>
#include <asm/io.h>

/* List representing chunks of contiguous memory areas and their offsets in
 * vmcore file.
 */
static LIST_HEAD(vmcore_list);

/* Stores the pointer to the buffer containing kernel elf core headers. */
static char *elfcorebuf;
static size_t elfcorebuf_sz;

/* Total size of vmcore file. */
static u64 vmcore_size;

static struct proc_dir_entry *proc_vmcore = NULL;

/* Reads a page from the oldmem device from given offset. */
static ssize_t read_from_oldmem(char *buf, size_t count,
				u64 *ppos, int userbuf)
{
	unsigned long pfn, offset;
	size_t nr_bytes;
	ssize_t read = 0, tmp;

	if (!count)
		return 0;

	offset = (unsigned long)(*ppos % PAGE_SIZE);
	pfn = (unsigned long)(*ppos / PAGE_SIZE);

	do {
		if (count > (PAGE_SIZE - offset))
			nr_bytes = PAGE_SIZE - offset;
		else
			nr_bytes = count;

		tmp = copy_oldmem_page(pfn, buf, nr_bytes, offset, userbuf);
		if (tmp < 0)
			return tmp;
		*ppos += nr_bytes;
		count -= nr_bytes;
		buf += nr_bytes;
		read += nr_bytes;
		++pfn;
		offset = 0;
	} while (count);

	return read;
}

/* Maps vmcore file offset to respective physical address in memroy. */
static u64 map_offset_to_paddr(loff_t offset, struct list_head *vc_list,
					struct vmcore **m_ptr)
{
	struct vmcore *m;
	u64 paddr;

	list_for_each_entry(m, vc_list, list) {
		u64 start, end;
		start = m->offset;
		end = m->offset + m->size - 1;
		if (offset >= start && offset <= end) {
			paddr = m->paddr + offset - start;
			*m_ptr = m;
			return paddr;
		}
	}
	*m_ptr = NULL;
	return 0;
}

/* Read from the ELF header and then the crash dump. On error, negative value is
 * returned otherwise number of bytes read are returned.
 */
static ssize_t read_vmcore(struct file *file, char __user *buffer,
				size_t buflen, loff_t *fpos)
{
	ssize_t acc = 0, tmp;
	size_t tsz;
	u64 start, nr_bytes;
	struct vmcore *curr_m = NULL;

	if (buflen == 0 || *fpos >= vmcore_size)
		return 0;

	/* trim buflen to not go beyond EOF */
	if (buflen > vmcore_size - *fpos)
		buflen = vmcore_size - *fpos;

	/* Read ELF core header */
	if (*fpos < elfcorebuf_sz) {
		tsz = elfcorebuf_sz - *fpos;
		if (buflen < tsz)
			tsz = buflen;
		if (copy_to_user(buffer, elfcorebuf + *fpos, tsz))
			return -EFAULT;
		buflen -= tsz;
		*fpos += tsz;
		buffer += tsz;
		acc += tsz;

		/* leave now if filled buffer already */
		if (buflen == 0)
			return acc;
	}

	start = map_offset_to_paddr(*fpos, &vmcore_list, &curr_m);
	if (!curr_m)
        	return -EINVAL;
	if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
		tsz = buflen;

	/* Calculate left bytes in current memory segment. */
	nr_bytes = (curr_m->size - (start - curr_m->paddr));
	if (tsz > nr_bytes)
		tsz = nr_bytes;

	while (buflen) {
		tmp = read_from_oldmem(buffer, tsz, &start, 1);
		if (tmp < 0)
			return tmp;
		buflen -= tsz;
		*fpos += tsz;
		buffer += tsz;
		acc += tsz;
		if (start >= (curr_m->paddr + curr_m->size)) {
			if (curr_m->list.next == &vmcore_list)
				return acc;	/*EOF*/
			curr_m = list_entry(curr_m->list.next,
						struct vmcore, list);
			start = curr_m->paddr;
		}
		if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
			tsz = buflen;
		/* Calculate left bytes in current memory segment. */
		nr_bytes = (curr_m->size - (start - curr_m->paddr));
		if (tsz > nr_bytes)
			tsz = nr_bytes;
	}
	return acc;
}

static const struct file_operations proc_vmcore_operations = {
	.read		= read_vmcore,
};

static struct vmcore* __init get_new_element(void)
{
	return kzalloc(sizeof(struct vmcore), GFP_KERNEL);
}

static u64 __init get_vmcore_size_elf64(char *elfptr)
{
	int i;
	u64 size;
	Elf64_Ehdr *ehdr_ptr;
	Elf64_Phdr *phdr_ptr;

	ehdr_ptr = (Elf64_Ehdr *)elfptr;
	phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr));
	size = sizeof(Elf64_Ehdr) + ((ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr));
	for (i = 0; i < ehdr_ptr->e_phnum; i++) {
		size += phdr_ptr->p_memsz;
		phdr_ptr++;
	}
	return size;
}

static u64 __init get_vmcore_size_elf32(char *elfptr)
{
	int i;
	u64 size;
	Elf32_Ehdr *ehdr_ptr;
	Elf32_Phdr *phdr_ptr;

	ehdr_ptr = (Elf32_Ehdr *)elfptr;
	phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr));
	size = sizeof(Elf32_Ehdr) + ((ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr));
	for (i = 0; i < ehdr_ptr->e_phnum; i++) {
		size += phdr_ptr->p_memsz;
		phdr_ptr++;
	}
	return size;
}

/* Merges all the PT_NOTE headers into one. */
static int __init merge_note_headers_elf64(char *elfptr, size_t *elfsz,
						struct list_head *vc_list)
{
	int i, nr_ptnote=0, rc=0;
	char *tmp;
	Elf64_Ehdr *ehdr_ptr;
	Elf64_Phdr phdr, *phdr_ptr;
	Elf64_Nhdr *nhdr_ptr;
	u64 phdr_sz = 0, note_off;

	ehdr_ptr = (Elf64_Ehdr *)elfptr;
	phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr));
	for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
		int j;
		void *notes_section;
		struct vmcore *new;
		u64 offset, max_sz, sz, real_sz = 0;
		if (phdr_ptr->p_type != PT_NOTE)
			continue;
		nr_ptnote++;
		max_sz = phdr_ptr->p_memsz;
		offset = phdr_ptr->p_offset;
		notes_section = kmalloc(max_sz, GFP_KERNEL);
		if (!notes_section)
			return -ENOMEM;
		rc = read_from_oldmem(notes_section, max_sz, &offset, 0);
		if (rc < 0) {
			kfree(notes_section);
			return rc;
		}
		nhdr_ptr = notes_section;
		for (j = 0; j < max_sz; j += sz) {
			if (nhdr_ptr->n_namesz == 0)
				break;
			sz = sizeof(Elf64_Nhdr) +
				((nhdr_ptr->n_namesz + 3) & ~3) +
				((nhdr_ptr->n_descsz + 3) & ~3);
			real_sz += sz;
			nhdr_ptr = (Elf64_Nhdr*)((char*)nhdr_ptr + sz);
		}

		/* Add this contiguous chunk of notes section to vmcore list.*/
		new = get_new_element();
		if (!new) {
			kfree(notes_section);
			return -ENOMEM;
		}
		new->paddr = phdr_ptr->p_offset;
		new->size = real_sz;
		list_add_tail(&new->list, vc_list);
		phdr_sz += real_sz;
		kfree(notes_section);
	}

	/* Prepare merged PT_NOTE program header. */
	phdr.p_type    = PT_NOTE;
	phdr.p_flags   = 0;
	note_off = sizeof(Elf64_Ehdr) +
			(ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf64_Phdr);
	phdr.p_offset  = note_off;
	phdr.p_vaddr   = phdr.p_paddr = 0;
	phdr.p_filesz  = phdr.p_memsz = phdr_sz;
	phdr.p_align   = 0;

	/* Add merged PT_NOTE program header*/
	tmp = elfptr + sizeof(Elf64_Ehdr);
	memcpy(tmp, &phdr, sizeof(phdr));
	tmp += sizeof(phdr);

	/* Remove unwanted PT_NOTE program headers. */
	i = (nr_ptnote - 1) * sizeof(Elf64_Phdr);
	*elfsz = *elfsz - i;
	memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf64_Ehdr)-sizeof(Elf64_Phdr)));

	/* Modify e_phnum to reflect merged headers. */
	ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1;

	return 0;
}

/* Merges all the PT_NOTE headers into one. */
static int __init merge_note_headers_elf32(char *elfptr, size_t *elfsz,
						struct list_head *vc_list)
{
	int i, nr_ptnote=0, rc=0;
	char *tmp;
	Elf32_Ehdr *ehdr_ptr;
	Elf32_Phdr phdr, *phdr_ptr;
	Elf32_Nhdr *nhdr_ptr;
	u64 phdr_sz = 0, note_off;

	ehdr_ptr = (Elf32_Ehdr *)elfptr;
	phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr));
	for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
		int j;
		void *notes_section;
		struct vmcore *new;
		u64 offset, max_sz, sz, real_sz = 0;
		if (phdr_ptr->p_type != PT_NOTE)
			continue;
		nr_ptnote++;
		max_sz = phdr_ptr->p_memsz;
		offset = phdr_ptr->p_offset;
		notes_section = kmalloc(max_sz, GFP_KERNEL);
		if (!notes_section)
			return -ENOMEM;
		rc = read_from_oldmem(notes_section, max_sz, &offset, 0);
		if (rc < 0) {
			kfree(notes_section);
			return rc;
		}
		nhdr_ptr = notes_section;
		for (j = 0; j < max_sz; j += sz) {
			if (nhdr_ptr->n_namesz == 0)
				break;
			sz = sizeof(Elf32_Nhdr) +
				((nhdr_ptr->n_namesz + 3) & ~3) +
				((nhdr_ptr->n_descsz + 3) & ~3);
			real_sz += sz;
			nhdr_ptr = (Elf32_Nhdr*)((char*)nhdr_ptr + sz);
		}

		/* Add this contiguous chunk of notes section to vmcore list.*/
		new = get_new_element();
		if (!new) {
			kfree(notes_section);
			return -ENOMEM;
		}
		new->paddr = phdr_ptr->p_offset;
		new->size = real_sz;
		list_add_tail(&new->list, vc_list);
		phdr_sz += real_sz;
		kfree(notes_section);
	}

	/* Prepare merged PT_NOTE program header. */
	phdr.p_type    = PT_NOTE;
	phdr.p_flags   = 0;
	note_off = sizeof(Elf32_Ehdr) +
			(ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf32_Phdr);
	phdr.p_offset  = note_off;
	phdr.p_vaddr   = phdr.p_paddr = 0;
	phdr.p_filesz  = phdr.p_memsz = phdr_sz;
	phdr.p_align   = 0;

	/* Add merged PT_NOTE program header*/
	tmp = elfptr + sizeof(Elf32_Ehdr);
	memcpy(tmp, &phdr, sizeof(phdr));
	tmp += sizeof(phdr);

	/* Remove unwanted PT_NOTE program headers. */
	i = (nr_ptnote - 1) * sizeof(Elf32_Phdr);
	*elfsz = *elfsz - i;
	memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf32_Ehdr)-sizeof(Elf32_Phdr)));

	/* Modify e_phnum to reflect merged headers. */
	ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1;

	return 0;
}

/* Add memory chunks represented by program headers to vmcore list. Also update
 * the new offset fields of exported program headers. */
static int __init process_ptload_program_headers_elf64(char *elfptr,
						size_t elfsz,
						struct list_head *vc_list)
{
	int i;
	Elf64_Ehdr *ehdr_ptr;
	Elf64_Phdr *phdr_ptr;
	loff_t vmcore_off;
	struct vmcore *new;

	ehdr_ptr = (Elf64_Ehdr *)elfptr;
	phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr)); /* PT_NOTE hdr */

	/* First program header is PT_NOTE header. */
	vmcore_off = sizeof(Elf64_Ehdr) +
			(ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr) +
			phdr_ptr->p_memsz; /* Note sections */

	for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
		if (phdr_ptr->p_type != PT_LOAD)
			continue;

		/* Add this contiguous chunk of memory to vmcore list.*/
		new = get_new_element();
		if (!new)
			return -ENOMEM;
		new->paddr = phdr_ptr->p_offset;
		new->size = phdr_ptr->p_memsz;
		list_add_tail(&new->list, vc_list);

		/* Update the program header offset. */
		phdr_ptr->p_offset = vmcore_off;
		vmcore_off = vmcore_off + phdr_ptr->p_memsz;
	}
	return 0;
}

static int __init process_ptload_program_headers_elf32(char *elfptr,
						size_t elfsz,
						struct list_head *vc_list)
{
	int i;
	Elf32_Ehdr *ehdr_ptr;
	Elf32_Phdr *phdr_ptr;
	loff_t vmcore_off;
	struct vmcore *new;

	ehdr_ptr = (Elf32_Ehdr *)elfptr;
	phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr)); /* PT_NOTE hdr */

	/* First program header is PT_NOTE header. */
	vmcore_off = sizeof(Elf32_Ehdr) +
			(ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr) +
			phdr_ptr->p_memsz; /* Note sections */

	for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
		if (phdr_ptr->p_type != PT_LOAD)
			continue;

		/* Add this contiguous chunk of memory to vmcore list.*/
		new = get_new_element();
		if (!new)
			return -ENOMEM;
		new->paddr = phdr_ptr->p_offset;
		new->size = phdr_ptr->p_memsz;
		list_add_tail(&new->list, vc_list);

		/* Update the program header offset */
		phdr_ptr->p_offset = vmcore_off;
		vmcore_off = vmcore_off + phdr_ptr->p_memsz;
	}
	return 0;
}

/* Sets offset fields of vmcore elements. */
static void __init set_vmcore_list_offsets_elf64(char *elfptr,
						struct list_head *vc_list)
{
	loff_t vmcore_off;
	Elf64_Ehdr *ehdr_ptr;
	struct vmcore *m;

	ehdr_ptr = (Elf64_Ehdr *)elfptr;

	/* Skip Elf header and program headers. */
	vmcore_off = sizeof(Elf64_Ehdr) +
			(ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr);

	list_for_each_entry(m, vc_list, list) {
		m->offset = vmcore_off;
		vmcore_off += m->size;
	}
}

/* Sets offset fields of vmcore elements. */
static void __init set_vmcore_list_offsets_elf32(char *elfptr,
						struct list_head *vc_list)
{
	loff_t vmcore_off;
	Elf32_Ehdr *ehdr_ptr;
	struct vmcore *m;

	ehdr_ptr = (Elf32_Ehdr *)elfptr;

	/* Skip Elf header and program headers. */
	vmcore_off = sizeof(Elf32_Ehdr) +
			(ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr);

	list_for_each_entry(m, vc_list, list) {
		m->offset = vmcore_off;
		vmcore_off += m->size;
	}
}

static int __init parse_crash_elf64_headers(void)
{
	int rc=0;
	Elf64_Ehdr ehdr;
	u64 addr;

	addr = elfcorehdr_addr;

	/* Read Elf header */
	rc = read_from_oldmem((char*)&ehdr, sizeof(Elf64_Ehdr), &addr, 0);
	if (rc < 0)
		return rc;

	/* Do some basic Verification. */
	if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 ||
		(ehdr.e_type != ET_CORE) ||
		!vmcore_elf_check_arch(&ehdr) ||
		ehdr.e_ident[EI_CLASS] != ELFCLASS64 ||
		ehdr.e_ident[EI_VERSION] != EV_CURRENT ||
		ehdr.e_version != EV_CURRENT ||
		ehdr.e_ehsize != sizeof(Elf64_Ehdr) ||
		ehdr.e_phentsize != sizeof(Elf64_Phdr) ||
		ehdr.e_phnum == 0) {
		printk(KERN_WARNING "Warning: Core image elf header is not"
					"sane\n");
		return -EINVAL;
	}

	/* Read in all elf headers. */
	elfcorebuf_sz = sizeof(Elf64_Ehdr) + ehdr.e_phnum * sizeof(Elf64_Phdr);
	elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
	if (!elfcorebuf)
		return -ENOMEM;
	addr = elfcorehdr_addr;
	rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, &addr, 0);
	if (rc < 0) {
		kfree(elfcorebuf);
		return rc;
	}

	/* Merge all PT_NOTE headers into one. */
	rc = merge_note_headers_elf64(elfcorebuf, &elfcorebuf_sz, &vmcore_list);
	if (rc) {
		kfree(elfcorebuf);
		return rc;
	}
	rc = process_ptload_program_headers_elf64(elfcorebuf, elfcorebuf_sz,
							&vmcore_list);
	if (rc) {
		kfree(elfcorebuf);
		return rc;
	}
	set_vmcore_list_offsets_elf64(elfcorebuf, &vmcore_list);
	return 0;
}

static int __init parse_crash_elf32_headers(void)
{
	int rc=0;
	Elf32_Ehdr ehdr;
	u64 addr;

	addr = elfcorehdr_addr;

	/* Read Elf header */
	rc = read_from_oldmem((char*)&ehdr, sizeof(Elf32_Ehdr), &addr, 0);
	if (rc < 0)
		return rc;

	/* Do some basic Verification. */
	if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 ||
		(ehdr.e_type != ET_CORE) ||
		!elf_check_arch(&ehdr) ||
		ehdr.e_ident[EI_CLASS] != ELFCLASS32||
		ehdr.e_ident[EI_VERSION] != EV_CURRENT ||
		ehdr.e_version != EV_CURRENT ||
		ehdr.e_ehsize != sizeof(Elf32_Ehdr) ||
		ehdr.e_phentsize != sizeof(Elf32_Phdr) ||
		ehdr.e_phnum == 0) {
		printk(KERN_WARNING "Warning: Core image elf header is not"
					"sane\n");
		return -EINVAL;
	}

	/* Read in all elf headers. */
	elfcorebuf_sz = sizeof(Elf32_Ehdr) + ehdr.e_phnum * sizeof(Elf32_Phdr);
	elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
	if (!elfcorebuf)
		return -ENOMEM;
	addr = elfcorehdr_addr;
	rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, &addr, 0);
	if (rc < 0) {
		kfree(elfcorebuf);
		return rc;
	}

	/* Merge all PT_NOTE headers into one. */
	rc = merge_note_headers_elf32(elfcorebuf, &elfcorebuf_sz, &vmcore_list);
	if (rc) {
		kfree(elfcorebuf);
		return rc;
	}
	rc = process_ptload_program_headers_elf32(elfcorebuf, elfcorebuf_sz,
								&vmcore_list);
	if (rc) {
		kfree(elfcorebuf);
		return rc;
	}
	set_vmcore_list_offsets_elf32(elfcorebuf, &vmcore_list);
	return 0;
}

static int __init parse_crash_elf_headers(void)
{
	unsigned char e_ident[EI_NIDENT];
	u64 addr;
	int rc=0;

	addr = elfcorehdr_addr;
	rc = read_from_oldmem(e_ident, EI_NIDENT, &addr, 0);
	if (rc < 0)
		return rc;
	if (memcmp(e_ident, ELFMAG, SELFMAG) != 0) {
		printk(KERN_WARNING "Warning: Core image elf header"
					" not found\n");
		return -EINVAL;
	}

	if (e_ident[EI_CLASS] == ELFCLASS64) {
		rc = parse_crash_elf64_headers();
		if (rc)
			return rc;

		/* Determine vmcore size. */
		vmcore_size = get_vmcore_size_elf64(elfcorebuf);
	} else if (e_ident[EI_CLASS] == ELFCLASS32) {
		rc = parse_crash_elf32_headers();
		if (rc)
			return rc;

		/* Determine vmcore size. */
		vmcore_size = get_vmcore_size_elf32(elfcorebuf);
	} else {
		printk(KERN_WARNING "Warning: Core image elf header is not"
					" sane\n");
		return -EINVAL;
	}
	return 0;
}

/* Init function for vmcore module. */
static int __init vmcore_init(void)
{
	int rc = 0;

	/* If elfcorehdr= has been passed in cmdline, then capture the dump.*/
	if (!(is_vmcore_usable()))
		return rc;
	rc = parse_crash_elf_headers();
	if (rc) {
		printk(KERN_WARNING "Kdump: vmcore not initialized\n");
		return rc;
	}

	proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
	if (proc_vmcore)
		proc_vmcore->size = vmcore_size;
	return 0;
}
module_init(vmcore_init)
Commit	Line	Data
666bfddb VG	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
666bfddb VG	10	#include <linux/mm.h>
	11	#include <linux/proc_fs.h>
	12	#include <linux/user.h>
666bfddb VG	13	#include <linux/elf.h>
666bfddb VG	14	#include <linux/elfcore.h>
5a0e3ad6	15	#include <linux/slab.h>
666bfddb VG	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>
	23
	24	/* List representing chunks of contiguous memory areas and their offsets in
	25	* vmcore file.
	26	*/
	27	static LIST_HEAD(vmcore_list);
	28
	29	/* Stores the pointer to the buffer containing kernel elf core headers. */
	30	static char *elfcorebuf;
	31	static size_t elfcorebuf_sz;
	32
	33	/* Total size of vmcore file. */
	34	static u64 vmcore_size;
	35
5aa140c2	36	static struct proc_dir_entry *proc_vmcore = NULL;
666bfddb VG	37
	38	/* Reads a page from the oldmem device from given offset. */
	39	static ssize_t read_from_oldmem(char *buf, size_t count,
9e9e3941	40	u64 *ppos, int userbuf)
666bfddb VG	41	{
	42	unsigned long pfn, offset;
	43	size_t nr_bytes;
	44	ssize_t read = 0, tmp;
	45
	46	if (!count)
	47	return 0;
	48
	49	offset = (unsigned long)(*ppos % PAGE_SIZE);
	50	pfn = (unsigned long)(*ppos / PAGE_SIZE);
666bfddb VG	51
	52	do {
	53	if (count > (PAGE_SIZE - offset))
	54	nr_bytes = PAGE_SIZE - offset;
	55	else
	56	nr_bytes = count;
	57
	58	tmp = copy_oldmem_page(pfn, buf, nr_bytes, offset, userbuf);
	59	if (tmp < 0)
	60	return tmp;
	61	*ppos += nr_bytes;
	62	count -= nr_bytes;
	63	buf += nr_bytes;
	64	read += nr_bytes;
	65	++pfn;
	66	offset = 0;
	67	} while (count);
	68
	69	return read;
	70	}
	71
	72	/* Maps vmcore file offset to respective physical address in memroy. */
	73	static u64 map_offset_to_paddr(loff_t offset, struct list_head *vc_list,
	74	struct vmcore **m_ptr)
	75	{
	76	struct vmcore *m;
	77	u64 paddr;
	78
	79	list_for_each_entry(m, vc_list, list) {
	80	u64 start, end;
	81	start = m->offset;
	82	end = m->offset + m->size - 1;
	83	if (offset >= start && offset <= end) {
	84	paddr = m->paddr + offset - start;
	85	*m_ptr = m;
	86	return paddr;
	87	}
	88	}
	89	*m_ptr = NULL;
	90	return 0;
	91	}
	92
	93	/* Read from the ELF header and then the crash dump. On error, negative value is
	94	* returned otherwise number of bytes read are returned.
	95	*/
	96	static ssize_t read_vmcore(struct file file, char __user buffer,
	97	size_t buflen, loff_t *fpos)
	98	{
	99	ssize_t acc = 0, tmp;
80e8ff63 VG	100	size_t tsz;
80e8ff63 VG	101	u64 start, nr_bytes;
666bfddb VG	102	struct vmcore *curr_m = NULL;
	103
	104	if (buflen == 0 \|\| *fpos >= vmcore_size)
	105	return 0;
	106
	107	/* trim buflen to not go beyond EOF */
	108	if (buflen > vmcore_size - *fpos)
	109	buflen = vmcore_size - *fpos;
	110
	111	/* Read ELF core header */
	112	if (*fpos < elfcorebuf_sz) {
	113	tsz = elfcorebuf_sz - *fpos;
	114	if (buflen < tsz)
	115	tsz = buflen;
	116	if (copy_to_user(buffer, elfcorebuf + *fpos, tsz))
	117	return -EFAULT;
	118	buflen -= tsz;
	119	*fpos += tsz;
	120	buffer += tsz;
	121	acc += tsz;
	122
	123	/* leave now if filled buffer already */
	124	if (buflen == 0)
	125	return acc;
	126	}
	127
	128	start = map_offset_to_paddr(*fpos, &vmcore_list, &curr_m);
	129	if (!curr_m)
	130	return -EINVAL;
	131	if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
	132	tsz = buflen;
	133
	134	/* Calculate left bytes in current memory segment. */
	135	nr_bytes = (curr_m->size - (start - curr_m->paddr));
	136	if (tsz > nr_bytes)
	137	tsz = nr_bytes;
	138
	139	while (buflen) {
	140	tmp = read_from_oldmem(buffer, tsz, &start, 1);
	141	if (tmp < 0)
	142	return tmp;
	143	buflen -= tsz;
	144	*fpos += tsz;
	145	buffer += tsz;
	146	acc += tsz;
	147	if (start >= (curr_m->paddr + curr_m->size)) {
	148	if (curr_m->list.next == &vmcore_list)
	149	return acc; /EOF/
	150	curr_m = list_entry(curr_m->list.next,
	151	struct vmcore, list);
	152	start = curr_m->paddr;
	153	}
	154	if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
	155	tsz = buflen;
	156	/* Calculate left bytes in current memory segment. */
	157	nr_bytes = (curr_m->size - (start - curr_m->paddr));
	158	if (tsz > nr_bytes)
	159	tsz = nr_bytes;
	160	}
	161	return acc;
	162	}
	163
5aa140c2	164	static const struct file_operations proc_vmcore_operations = {
666bfddb	165	.read = read_vmcore,
666bfddb VG	166	};
	167
	168	static struct vmcore* __init get_new_element(void)
	169	{
2f6d3110	170	return kzalloc(sizeof(struct vmcore), GFP_KERNEL);
666bfddb VG	171	}
	172
	173	static u64 __init get_vmcore_size_elf64(char *elfptr)
	174	{
	175	int i;
	176	u64 size;
	177	Elf64_Ehdr *ehdr_ptr;
	178	Elf64_Phdr *phdr_ptr;
	179
	180	ehdr_ptr = (Elf64_Ehdr *)elfptr;
	181	phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr));
	182	size = sizeof(Elf64_Ehdr) + ((ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr));
	183	for (i = 0; i < ehdr_ptr->e_phnum; i++) {
	184	size += phdr_ptr->p_memsz;
	185	phdr_ptr++;
	186	}
	187	return size;
	188	}
	189
72658e9d VG	190	static u64 __init get_vmcore_size_elf32(char *elfptr)
	191	{
	192	int i;
	193	u64 size;
	194	Elf32_Ehdr *ehdr_ptr;
	195	Elf32_Phdr *phdr_ptr;
	196
	197	ehdr_ptr = (Elf32_Ehdr *)elfptr;
	198	phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr));
	199	size = sizeof(Elf32_Ehdr) + ((ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr));
	200	for (i = 0; i < ehdr_ptr->e_phnum; i++) {
	201	size += phdr_ptr->p_memsz;
	202	phdr_ptr++;
	203	}
	204	return size;
	205	}
	206
666bfddb VG	207	/* Merges all the PT_NOTE headers into one. */
	208	static int __init merge_note_headers_elf64(char elfptr, size_t elfsz,
	209	struct list_head *vc_list)
	210	{
	211	int i, nr_ptnote=0, rc=0;
	212	char *tmp;
	213	Elf64_Ehdr *ehdr_ptr;
	214	Elf64_Phdr phdr, *phdr_ptr;
	215	Elf64_Nhdr *nhdr_ptr;
	216	u64 phdr_sz = 0, note_off;
	217
	218	ehdr_ptr = (Elf64_Ehdr *)elfptr;
	219	phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr));
	220	for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
	221	int j;
	222	void *notes_section;
	223	struct vmcore *new;
	224	u64 offset, max_sz, sz, real_sz = 0;
	225	if (phdr_ptr->p_type != PT_NOTE)
	226	continue;
	227	nr_ptnote++;
	228	max_sz = phdr_ptr->p_memsz;
	229	offset = phdr_ptr->p_offset;
	230	notes_section = kmalloc(max_sz, GFP_KERNEL);
	231	if (!notes_section)
	232	return -ENOMEM;
	233	rc = read_from_oldmem(notes_section, max_sz, &offset, 0);
	234	if (rc < 0) {
	235	kfree(notes_section);
	236	return rc;
	237	}
	238	nhdr_ptr = notes_section;
	239	for (j = 0; j < max_sz; j += sz) {
	240	if (nhdr_ptr->n_namesz == 0)
	241	break;
	242	sz = sizeof(Elf64_Nhdr) +
	243	((nhdr_ptr->n_namesz + 3) & ~3) +
	244	((nhdr_ptr->n_descsz + 3) & ~3);
	245	real_sz += sz;
	246	nhdr_ptr = (Elf64_Nhdr)((char)nhdr_ptr + sz);
	247	}
	248
	249	/* Add this contiguous chunk of notes section to vmcore list.*/
	250	new = get_new_element();
	251	if (!new) {
	252	kfree(notes_section);
	253	return -ENOMEM;
	254	}
	255	new->paddr = phdr_ptr->p_offset;
	256	new->size = real_sz;
	257	list_add_tail(&new->list, vc_list);
	258	phdr_sz += real_sz;
	259	kfree(notes_section);
	260	}
	261
	262	/* Prepare merged PT_NOTE program header. */
	263	phdr.p_type = PT_NOTE;
	264	phdr.p_flags = 0;
	265	note_off = sizeof(Elf64_Ehdr) +
	266	(ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf64_Phdr);
	267	phdr.p_offset = note_off;
	268	phdr.p_vaddr = phdr.p_paddr = 0;
	269	phdr.p_filesz = phdr.p_memsz = phdr_sz;
	270	phdr.p_align = 0;
271
272	/* Add merged PT_NOTE program header*/
273	tmp = elfptr + sizeof(Elf64_Ehdr);
274	memcpy(tmp, &phdr, sizeof(phdr));
275	tmp += sizeof(phdr);
276
277	/* Remove unwanted PT_NOTE program headers. */
278	i = (nr_ptnote - 1) * sizeof(Elf64_Phdr);
279	elfsz = elfsz - i;
280	memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf64_Ehdr)-sizeof(Elf64_Phdr)));
281
282	/* Modify e_phnum to reflect merged headers. */
283	ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1;
284
285	return 0;
286	}
287
72658e9d VG	288	/* Merges all the PT_NOTE headers into one. */
	289	static int __init merge_note_headers_elf32(char elfptr, size_t elfsz,
	290	struct list_head *vc_list)
	291	{
	292	int i, nr_ptnote=0, rc=0;
	293	char *tmp;
	294	Elf32_Ehdr *ehdr_ptr;
	295	Elf32_Phdr phdr, *phdr_ptr;
	296	Elf32_Nhdr *nhdr_ptr;
	297	u64 phdr_sz = 0, note_off;
	298
	299	ehdr_ptr = (Elf32_Ehdr *)elfptr;
	300	phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr));
	301	for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
	302	int j;
	303	void *notes_section;
	304	struct vmcore *new;
	305	u64 offset, max_sz, sz, real_sz = 0;
	306	if (phdr_ptr->p_type != PT_NOTE)
	307	continue;
	308	nr_ptnote++;
	309	max_sz = phdr_ptr->p_memsz;
	310	offset = phdr_ptr->p_offset;
	311	notes_section = kmalloc(max_sz, GFP_KERNEL);
	312	if (!notes_section)
	313	return -ENOMEM;
	314	rc = read_from_oldmem(notes_section, max_sz, &offset, 0);
	315	if (rc < 0) {
	316	kfree(notes_section);
	317	return rc;
	318	}
	319	nhdr_ptr = notes_section;
	320	for (j = 0; j < max_sz; j += sz) {
	321	if (nhdr_ptr->n_namesz == 0)
	322	break;
	323	sz = sizeof(Elf32_Nhdr) +
	324	((nhdr_ptr->n_namesz + 3) & ~3) +
	325	((nhdr_ptr->n_descsz + 3) & ~3);
	326	real_sz += sz;
	327	nhdr_ptr = (Elf32_Nhdr)((char)nhdr_ptr + sz);
	328	}
	329
	330	/* Add this contiguous chunk of notes section to vmcore list.*/
	331	new = get_new_element();
	332	if (!new) {
	333	kfree(notes_section);
	334	return -ENOMEM;
	335	}
	336	new->paddr = phdr_ptr->p_offset;
	337	new->size = real_sz;
	338	list_add_tail(&new->list, vc_list);
	339	phdr_sz += real_sz;
	340	kfree(notes_section);
	341	}
	342
	343	/* Prepare merged PT_NOTE program header. */
	344	phdr.p_type = PT_NOTE;
	345	phdr.p_flags = 0;
	346	note_off = sizeof(Elf32_Ehdr) +
	347	(ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf32_Phdr);
	348	phdr.p_offset = note_off;
	349	phdr.p_vaddr = phdr.p_paddr = 0;
	350	phdr.p_filesz = phdr.p_memsz = phdr_sz;
	351	phdr.p_align = 0;
352
353	/* Add merged PT_NOTE program header*/
354	tmp = elfptr + sizeof(Elf32_Ehdr);
355	memcpy(tmp, &phdr, sizeof(phdr));
356	tmp += sizeof(phdr);
357
358	/* Remove unwanted PT_NOTE program headers. */
359	i = (nr_ptnote - 1) * sizeof(Elf32_Phdr);
360	elfsz = elfsz - i;
361	memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf32_Ehdr)-sizeof(Elf32_Phdr)));
362
363	/* Modify e_phnum to reflect merged headers. */
364	ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1;
365
366	return 0;
367	}
368
666bfddb VG	369	/* Add memory chunks represented by program headers to vmcore list. Also update
	370	* the new offset fields of exported program headers. */
	371	static int __init process_ptload_program_headers_elf64(char *elfptr,
	372	size_t elfsz,
	373	struct list_head *vc_list)
	374	{
	375	int i;
	376	Elf64_Ehdr *ehdr_ptr;
	377	Elf64_Phdr *phdr_ptr;
	378	loff_t vmcore_off;
	379	struct vmcore *new;
	380
	381	ehdr_ptr = (Elf64_Ehdr *)elfptr;
	382	phdr_ptr = (Elf64_Phdr)(elfptr + sizeof(Elf64_Ehdr)); / PT_NOTE hdr */
	383
	384	/* First program header is PT_NOTE header. */
	385	vmcore_off = sizeof(Elf64_Ehdr) +
	386	(ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr) +
	387	phdr_ptr->p_memsz; /* Note sections */
	388
	389	for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
	390	if (phdr_ptr->p_type != PT_LOAD)
	391	continue;
	392
	393	/* Add this contiguous chunk of memory to vmcore list.*/
	394	new = get_new_element();
	395	if (!new)
	396	return -ENOMEM;
	397	new->paddr = phdr_ptr->p_offset;
	398	new->size = phdr_ptr->p_memsz;
	399	list_add_tail(&new->list, vc_list);
	400
	401	/* Update the program header offset. */
	402	phdr_ptr->p_offset = vmcore_off;
	403	vmcore_off = vmcore_off + phdr_ptr->p_memsz;
	404	}
	405	return 0;
	406	}
	407
72658e9d VG	408	static int __init process_ptload_program_headers_elf32(char *elfptr,
	409	size_t elfsz,
	410	struct list_head *vc_list)
	411	{
	412	int i;
	413	Elf32_Ehdr *ehdr_ptr;
	414	Elf32_Phdr *phdr_ptr;
	415	loff_t vmcore_off;
	416	struct vmcore *new;
	417
	418	ehdr_ptr = (Elf32_Ehdr *)elfptr;
	419	phdr_ptr = (Elf32_Phdr)(elfptr + sizeof(Elf32_Ehdr)); / PT_NOTE hdr */
	420
	421	/* First program header is PT_NOTE header. */
	422	vmcore_off = sizeof(Elf32_Ehdr) +
	423	(ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr) +
	424	phdr_ptr->p_memsz; /* Note sections */
	425
	426	for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
	427	if (phdr_ptr->p_type != PT_LOAD)
	428	continue;
	429
	430	/* Add this contiguous chunk of memory to vmcore list.*/
	431	new = get_new_element();
	432	if (!new)
	433	return -ENOMEM;
	434	new->paddr = phdr_ptr->p_offset;
	435	new->size = phdr_ptr->p_memsz;
	436	list_add_tail(&new->list, vc_list);
	437
	438	/* Update the program header offset */
	439	phdr_ptr->p_offset = vmcore_off;
	440	vmcore_off = vmcore_off + phdr_ptr->p_memsz;
	441	}
	442	return 0;
	443	}
	444
666bfddb VG	445	/* Sets offset fields of vmcore elements. */
	446	static void __init set_vmcore_list_offsets_elf64(char *elfptr,
	447	struct list_head *vc_list)
	448	{
	449	loff_t vmcore_off;
	450	Elf64_Ehdr *ehdr_ptr;
	451	struct vmcore *m;
	452
	453	ehdr_ptr = (Elf64_Ehdr *)elfptr;
	454
	455	/* Skip Elf header and program headers. */
	456	vmcore_off = sizeof(Elf64_Ehdr) +
	457	(ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr);
	458
	459	list_for_each_entry(m, vc_list, list) {
	460	m->offset = vmcore_off;
	461	vmcore_off += m->size;
	462	}
	463	}
	464
72658e9d VG	465	/* Sets offset fields of vmcore elements. */
	466	static void __init set_vmcore_list_offsets_elf32(char *elfptr,
	467	struct list_head *vc_list)
	468	{
	469	loff_t vmcore_off;
	470	Elf32_Ehdr *ehdr_ptr;
	471	struct vmcore *m;
	472
	473	ehdr_ptr = (Elf32_Ehdr *)elfptr;
	474
	475	/* Skip Elf header and program headers. */
	476	vmcore_off = sizeof(Elf32_Ehdr) +
	477	(ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr);
	478
	479	list_for_each_entry(m, vc_list, list) {
	480	m->offset = vmcore_off;
	481	vmcore_off += m->size;
	482	}
	483	}
	484
666bfddb VG	485	static int __init parse_crash_elf64_headers(void)
	486	{
	487	int rc=0;
	488	Elf64_Ehdr ehdr;
	489	u64 addr;
	490
	491	addr = elfcorehdr_addr;
	492
	493	/* Read Elf header */
	494	rc = read_from_oldmem((char*)&ehdr, sizeof(Elf64_Ehdr), &addr, 0);
	495	if (rc < 0)
	496	return rc;
	497
	498	/* Do some basic Verification. */
	499	if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 \|\|
	500	(ehdr.e_type != ET_CORE) \|\|
79e03011	501	!vmcore_elf_check_arch(&ehdr) \|\|
666bfddb VG	502	ehdr.e_ident[EI_CLASS] != ELFCLASS64 \|\|
	503	ehdr.e_ident[EI_VERSION] != EV_CURRENT \|\|
	504	ehdr.e_version != EV_CURRENT \|\|
	505	ehdr.e_ehsize != sizeof(Elf64_Ehdr) \|\|
	506	ehdr.e_phentsize != sizeof(Elf64_Phdr) \|\|
	507	ehdr.e_phnum == 0) {
	508	printk(KERN_WARNING "Warning: Core image elf header is not"
	509	"sane\n");
	510	return -EINVAL;
	511	}
	512
	513	/* Read in all elf headers. */
	514	elfcorebuf_sz = sizeof(Elf64_Ehdr) + ehdr.e_phnum * sizeof(Elf64_Phdr);
	515	elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
	516	if (!elfcorebuf)
	517	return -ENOMEM;
	518	addr = elfcorehdr_addr;
	519	rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, &addr, 0);
	520	if (rc < 0) {
	521	kfree(elfcorebuf);
	522	return rc;
	523	}
	524
	525	/* Merge all PT_NOTE headers into one. */
	526	rc = merge_note_headers_elf64(elfcorebuf, &elfcorebuf_sz, &vmcore_list);
	527	if (rc) {
	528	kfree(elfcorebuf);
	529	return rc;
	530	}
	531	rc = process_ptload_program_headers_elf64(elfcorebuf, elfcorebuf_sz,
	532	&vmcore_list);
	533	if (rc) {
	534	kfree(elfcorebuf);
	535	return rc;
	536	}
	537	set_vmcore_list_offsets_elf64(elfcorebuf, &vmcore_list);
	538	return 0;
	539	}
	540
72658e9d VG	541	static int __init parse_crash_elf32_headers(void)
	542	{
	543	int rc=0;
	544	Elf32_Ehdr ehdr;
	545	u64 addr;
	546
	547	addr = elfcorehdr_addr;
	548
	549	/* Read Elf header */
	550	rc = read_from_oldmem((char*)&ehdr, sizeof(Elf32_Ehdr), &addr, 0);
	551	if (rc < 0)
	552	return rc;
	553
	554	/* Do some basic Verification. */
	555	if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 \|\|
	556	(ehdr.e_type != ET_CORE) \|\|
	557	!elf_check_arch(&ehdr) \|\|
	558	ehdr.e_ident[EI_CLASS] != ELFCLASS32\|\|
	559	ehdr.e_ident[EI_VERSION] != EV_CURRENT \|\|
	560	ehdr.e_version != EV_CURRENT \|\|
	561	ehdr.e_ehsize != sizeof(Elf32_Ehdr) \|\|
	562	ehdr.e_phentsize != sizeof(Elf32_Phdr) \|\|
	563	ehdr.e_phnum == 0) {
	564	printk(KERN_WARNING "Warning: Core image elf header is not"
	565	"sane\n");
	566	return -EINVAL;
	567	}
	568
	569	/* Read in all elf headers. */
	570	elfcorebuf_sz = sizeof(Elf32_Ehdr) + ehdr.e_phnum * sizeof(Elf32_Phdr);
	571	elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
	572	if (!elfcorebuf)
	573	return -ENOMEM;
	574	addr = elfcorehdr_addr;
	575	rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, &addr, 0);
	576	if (rc < 0) {
	577	kfree(elfcorebuf);
	578	return rc;
	579	}
	580
	581	/* Merge all PT_NOTE headers into one. */
	582	rc = merge_note_headers_elf32(elfcorebuf, &elfcorebuf_sz, &vmcore_list);
	583	if (rc) {
	584	kfree(elfcorebuf);
	585	return rc;
	586	}
	587	rc = process_ptload_program_headers_elf32(elfcorebuf, elfcorebuf_sz,
	588	&vmcore_list);
	589	if (rc) {
	590	kfree(elfcorebuf);
	591	return rc;
	592	}
	593	set_vmcore_list_offsets_elf32(elfcorebuf, &vmcore_list);
	594	return 0;
	595	}
	596
666bfddb VG	597	static int __init parse_crash_elf_headers(void)
	598	{
	599	unsigned char e_ident[EI_NIDENT];
	600	u64 addr;
	601	int rc=0;
	602
	603	addr = elfcorehdr_addr;
	604	rc = read_from_oldmem(e_ident, EI_NIDENT, &addr, 0);
	605	if (rc < 0)
	606	return rc;
	607	if (memcmp(e_ident, ELFMAG, SELFMAG) != 0) {
	608	printk(KERN_WARNING "Warning: Core image elf header"
	609	" not found\n");
	610	return -EINVAL;
	611	}
	612
	613	if (e_ident[EI_CLASS] == ELFCLASS64) {
	614	rc = parse_crash_elf64_headers();
	615	if (rc)
	616	return rc;
	617
	618	/* Determine vmcore size. */
	619	vmcore_size = get_vmcore_size_elf64(elfcorebuf);
72658e9d VG	620	} else if (e_ident[EI_CLASS] == ELFCLASS32) {
	621	rc = parse_crash_elf32_headers();
	622	if (rc)
	623	return rc;
	624
	625	/* Determine vmcore size. */
	626	vmcore_size = get_vmcore_size_elf32(elfcorebuf);
666bfddb VG	627	} else {
	628	printk(KERN_WARNING "Warning: Core image elf header is not"
	629	" sane\n");
	630	return -EINVAL;
	631	}
	632	return 0;
	633	}
	634
	635	/* Init function for vmcore module. */
	636	static int __init vmcore_init(void)
	637	{
	638	int rc = 0;
	639
	640	/* If elfcorehdr= has been passed in cmdline, then capture the dump.*/
85a0ee34	641	if (!(is_vmcore_usable()))
666bfddb VG	642	return rc;
	643	rc = parse_crash_elf_headers();
	644	if (rc) {
	645	printk(KERN_WARNING "Kdump: vmcore not initialized\n");
	646	return rc;
	647	}
	648
5aa140c2	649	proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
666bfddb VG	650	if (proc_vmcore)
	651	proc_vmcore->size = vmcore_size;
	652	return 0;
	653	}
	654	module_init(vmcore_init)