LXR linux/kernel/crash

   1// SPDX-License-Identifier: GPL-2.0-only
   2#include <linux/kernel.h>
   3#include <linux/crash_dump.h>
   4#include <linux/init.h>
   5#include <linux/errno.h>
   6#include <linux/export.h>
   7
   8/*
   9 * stores the physical address of elf header of crash image
  10 *
  11 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
  12 * is_kdump_kernel() to determine if we are booting after a panic. Hence put
  13 * it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
  14 */
  15unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
  16EXPORT_SYMBOL_GPL(elfcorehdr_addr);
  17
  18/*
  19 * stores the size of elf header of crash image
  20 */
  21unsigned long long elfcorehdr_size;
  22
  23/*
  24 * elfcorehdr= specifies the location of elf core header stored by the crashed
  25 * kernel. This option will be passed by kexec loader to the capture kernel.
  26 *
  27 * Syntax: elfcorehdr=[size[KMG]@]offset[KMG]
  28 */
  29static int __init setup_elfcorehdr(char *arg)
  30{
  31        char *end;
  32        if (!arg)
  33                return -EINVAL;
  34        elfcorehdr_addr = memparse(arg, &end);
  35        if (*end == '@') {
  36                elfcorehdr_size = elfcorehdr_addr;
  37                elfcorehdr_addr = memparse(end + 1, &end);
  38        }
  39        return end > arg ? 0 : -EINVAL;
  40}
  41early_param("elfcorehdr", setup_elfcorehdr);
  42