Updated `README.md` with instructions for building/using the kernel module.
[xeon-phi-kernel-module] / host / vmcore.c
/*
* Copyright 2010-2017 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* Disclaimer: The codes contained in these modules may be specific to
* the Intel Software Development Platform codenamed Knights Ferry,
* and the Intel product codenamed Knights Corner, and are not backward
* compatible with other Intel products. Additionally, Intel will NOT
* support the codes or instruction set in future products.
*
* Intel offers no warranty of any kind regarding the code. This code is
* licensed on an "AS IS" basis and Intel is not obligated to provide
* any support, assistance, installation, training, or other services
* of any kind. Intel is also not obligated to provide any updates,
* enhancements or extensions. Intel specifically disclaims any warranty
* of merchantability, non-infringement, fitness for any particular
* purpose, and any other warranty.
*
* Further, Intel disclaims all liability of any kind, including but
* not limited to liability for infringement of any proprietary rights,
* relating to the use of the code, even if Intel is notified of the
* possibility of such liability. Except as expressly stated in an Intel
* license agreement provided with this code and agreed upon with Intel,
* no license, express or implied, by estoppel or otherwise, to any
* intellectual property rights is granted herein.
*/
/*
* 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/version.h>
#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>
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0))
#include <linux/kcore.h>
#endif
#include "mic_common.h"
extern struct proc_dir_entry *vmcore_dir;
/* Stores the physical address of elf header of crash image. */
unsigned long long elfcorehdr_addr = 0x50e9000;
/**
* mic_copy_oldmem_page - copy one page from "oldmem"
* @pfn: page frame number to be copied
* @buf: target memory address for the copy; this can be in kernel address
* space or user address space (see @userbuf)
* @csize: number of bytes to copy
* @offset: offset in bytes into the page (based on pfn) to begin the copy
* @userbuf: if set, @buf is in user address space, use copy_to_user(),
* otherwise @buf is in kernel address space, use memcpy().
*
* Copy a page from "oldmem". For this page, there is no pte mapped
* in the current kernel. We stitch up a pte, similar to kmap_atomic.
*/
ssize_t mic_copy_oldmem_page(mic_ctx_t *mic_ctx,
unsigned long pfn, char *buf,
size_t csize, unsigned long offset, int userbuf)
{
void *vaddr, *tmp;
int err;
struct dma_channel *dma_chan;
dma_addr_t mic_dst_phys_addr;
vaddr = mic_ctx->aper.va + (pfn << PAGE_SHIFT);
if (!csize)
return 0;
if (csize == PAGE_SIZE && !offset) {
if (!(tmp = (void*)__get_free_pages(GFP_KERNEL, get_order(PAGE_SIZE)))) {
printk(KERN_ERR "%s: tmp buffer allocation failed\n", __func__);
return -ENOMEM;
}
mic_dst_phys_addr = mic_ctx_map_single(mic_ctx, tmp, csize);
if (mic_map_error(mic_dst_phys_addr)) {
printk(KERN_ERR "%s: mic_ctx_map_single failed\n", __func__);
free_pages((unsigned long)tmp, get_order(PAGE_SIZE));
return -ENOMEM;
}
if ((allocate_dma_channel(mic_ctx->dma_handle, &dma_chan))) {
printk(KERN_ERR "%s: allocate_dma_channel failed\n", __func__);
mic_ctx_unmap_single(mic_ctx, mic_dst_phys_addr, csize);
free_pages((unsigned long)tmp, get_order(PAGE_SIZE));
return -EBUSY;
}
err = do_dma(dma_chan,
0,
pfn << PAGE_SHIFT,
mic_dst_phys_addr,
csize,
NULL);
if (err) {
printk(KERN_ERR "DMA do_dma err %s %d err %d src 0x%lx "
"dst 0x%llx csize 0x%lx\n",
__func__, __LINE__, err, pfn << PAGE_SHIFT,
mic_dst_phys_addr, csize);
free_dma_channel(dma_chan);
mic_ctx_unmap_single(mic_ctx, mic_dst_phys_addr, csize);
free_pages((unsigned long)tmp, get_order(PAGE_SIZE));
return err;
}
free_dma_channel(dma_chan);
err = drain_dma_poll(dma_chan);
if (err) {
printk(KERN_ERR "DMA poll err %s %d err %d src 0x%lx i"
"dst 0x%llx csize 0x%lx\n",
__func__, __LINE__, err, pfn << PAGE_SHIFT,
mic_dst_phys_addr, csize);
mic_ctx_unmap_single(mic_ctx, mic_dst_phys_addr, csize);
free_pages((unsigned long)tmp, get_order(PAGE_SIZE));
return err;
}
if (userbuf) {
if (copy_to_user(buf, tmp, csize)) {
mic_ctx_unmap_single(mic_ctx, mic_dst_phys_addr, csize);
free_pages((unsigned long)tmp, get_order(PAGE_SIZE));
return -EFAULT;
}
} else {
memcpy(buf, tmp, csize);
}
smp_mb();
mic_ctx_unmap_single(mic_ctx, mic_dst_phys_addr, csize);
free_pages((unsigned long)tmp, get_order(PAGE_SIZE));
} else {
if (userbuf) {
if (copy_to_user(buf, vaddr + offset, csize))
return -EFAULT;
} else
memcpy_fromio(buf, vaddr + offset, csize);
}
return csize;
}
/* Reads a page from the oldmem device from given offset. */
static ssize_t read_from_oldmem(mic_ctx_t *mic_ctx,
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 = mic_copy_oldmem_page(mic_ctx, 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;
struct inode *inode = file->f_path.dentry->d_inode;
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0))
mic_ctx_t *mic_ctx = PDE_DATA(inode);
#else
struct proc_dir_entry *entry = PDE(inode);
mic_ctx_t *mic_ctx = entry->data;
#endif
if (buflen == 0 || *fpos >= mic_ctx->vmcore_size)
return 0;
/* trim buflen to not go beyond EOF */
if (buflen > mic_ctx->vmcore_size - *fpos)
buflen = mic_ctx->vmcore_size - *fpos;
/* Read ELF core header */
if (*fpos < mic_ctx->elfcorebuf_sz) {
tsz = mic_ctx->elfcorebuf_sz - *fpos;
if (buflen < tsz)
tsz = buflen;
if (copy_to_user(buffer, mic_ctx->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, &mic_ctx->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(mic_ctx,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 == &mic_ctx->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* get_new_element(void)
{
return kzalloc(sizeof(struct vmcore), GFP_KERNEL);
}
static u64 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 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 merge_note_headers_elf64(mic_ctx_t *mic_ctx,
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(mic_ctx, 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 merge_note_headers_elf32(mic_ctx_t *mic_ctx,
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(mic_ctx, 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 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 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 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 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 parse_crash_elf64_headers(mic_ctx_t *mic_ctx)
{
int rc=0;
Elf64_Ehdr ehdr;
u64 addr;
addr = elfcorehdr_addr;
/* Read Elf header */
rc = read_from_oldmem(mic_ctx, (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) ||
#ifdef CONFIG_CRASH_DUMP
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,36))
!vmcore_elf64_check_arch(&ehdr) ||
#else
!vmcore_elf_check_arch(&ehdr) ||
#endif
#else
!elf_check_arch(&ehdr) ||
#endif
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;
}
WARN_ON(mic_ctx->elfcorebuf);
/* Read in all elf headers. */
mic_ctx->elfcorebuf_sz = sizeof(Elf64_Ehdr) + ehdr.e_phnum * sizeof(Elf64_Phdr);
mic_ctx->elfcorebuf = kmalloc(mic_ctx->elfcorebuf_sz, GFP_KERNEL);
if (!mic_ctx->elfcorebuf)
return -ENOMEM;
addr = elfcorehdr_addr;
rc = read_from_oldmem(mic_ctx, mic_ctx->elfcorebuf, mic_ctx->elfcorebuf_sz, &addr, 0);
if (rc < 0) {
kfree(mic_ctx->elfcorebuf);
mic_ctx->elfcorebuf = NULL;
return rc;
}
/* Merge all PT_NOTE headers into one. */
rc = merge_note_headers_elf64(mic_ctx, mic_ctx->elfcorebuf, &mic_ctx->elfcorebuf_sz, &mic_ctx->vmcore_list);
if (rc) {
kfree(mic_ctx->elfcorebuf);
mic_ctx->elfcorebuf = NULL;
return rc;
}
rc = process_ptload_program_headers_elf64(mic_ctx->elfcorebuf, mic_ctx->elfcorebuf_sz,
&mic_ctx->vmcore_list);
if (rc) {
kfree(mic_ctx->elfcorebuf);
mic_ctx->elfcorebuf = NULL;
return rc;
}
set_vmcore_list_offsets_elf64(mic_ctx->elfcorebuf, &mic_ctx->vmcore_list);
return 0;
}
static int parse_crash_elf32_headers(mic_ctx_t *mic_ctx)
{
int rc=0;
Elf32_Ehdr ehdr;
u64 addr;
addr = elfcorehdr_addr;
/* Read Elf header */
rc = read_from_oldmem(mic_ctx, (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;
}
WARN_ON(mic_ctx->elfcorebuf);
/* Read in all elf headers. */
mic_ctx->elfcorebuf_sz = sizeof(Elf32_Ehdr) + ehdr.e_phnum * sizeof(Elf32_Phdr);
mic_ctx->elfcorebuf = kmalloc(mic_ctx->elfcorebuf_sz, GFP_KERNEL);
if (!mic_ctx->elfcorebuf)
return -ENOMEM;
addr = elfcorehdr_addr;
rc = read_from_oldmem(mic_ctx, mic_ctx->elfcorebuf, mic_ctx->elfcorebuf_sz, &addr, 0);
if (rc < 0) {
kfree(mic_ctx->elfcorebuf);
mic_ctx->elfcorebuf = NULL;
return rc;
}
/* Merge all PT_NOTE headers into one. */
rc = merge_note_headers_elf32(mic_ctx, mic_ctx->elfcorebuf, &mic_ctx->elfcorebuf_sz, &mic_ctx->vmcore_list);
if (rc) {
kfree(mic_ctx->elfcorebuf);
mic_ctx->elfcorebuf = NULL;
return rc;
}
rc = process_ptload_program_headers_elf32(mic_ctx->elfcorebuf, mic_ctx->elfcorebuf_sz,
&mic_ctx->vmcore_list);
if (rc) {
kfree(mic_ctx->elfcorebuf);
mic_ctx->elfcorebuf = NULL;
return rc;
}
set_vmcore_list_offsets_elf32(mic_ctx->elfcorebuf, &mic_ctx->vmcore_list);
return 0;
}
static int parse_crash_elf_headers(mic_ctx_t *mic_ctx)
{
unsigned char e_ident[EI_NIDENT];
u64 addr;
int rc=0;
addr = elfcorehdr_addr;
rc = read_from_oldmem(mic_ctx, 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(mic_ctx);
if (rc)
return rc;
/* Determine vmcore size. */
mic_ctx->vmcore_size = get_vmcore_size_elf64(mic_ctx->elfcorebuf);
} else if (e_ident[EI_CLASS] == ELFCLASS32) {
rc = parse_crash_elf32_headers(mic_ctx);
if (rc)
return rc;
/* Determine vmcore size. */
mic_ctx->vmcore_size = get_vmcore_size_elf32(mic_ctx->elfcorebuf);
} else {
printk(KERN_WARNING "Warning: Core image elf header is not"
" sane\n");
return -EINVAL;
}
return 0;
}
/* Init function for vmcore module. */
int vmcore_create(mic_ctx_t *mic_ctx)
{
int rc = 0;
char name[64];
if (!vmcore_dir) {
rc = -ENOMEM;
return rc;
}
INIT_LIST_HEAD(&mic_ctx->vmcore_list);
rc = parse_crash_elf_headers(mic_ctx);
if (rc) {
printk(KERN_WARNING "Kdump: vmcore not initialized\n");
if (mic_ctx->vmcore_dir) {
remove_proc_entry(name, vmcore_dir);
mic_ctx->vmcore_dir = NULL;
}
return rc;
}
snprintf(name, 64, "mic%d", mic_ctx->bi_id);
if (!mic_ctx->vmcore_dir) {
mic_ctx->vmcore_dir = proc_create_data(name, S_IRUSR,
vmcore_dir, &proc_vmcore_operations, mic_ctx);
if (!mic_ctx->vmcore_dir) {
printk(KERN_WARNING "Kdump: proc creation for %s failed\n", name);
rc = -ENOMEM;
return rc;
}
}
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0))
#else
if (mic_ctx->vmcore_dir)
mic_ctx->vmcore_dir->size = mic_ctx->vmcore_size;
#endif
return 0;
}