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 */ 15 unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX; 16 EXPORT_SYMBOL_GPL(elfcorehdr_addr); 17 18 /* 19 * stores the size of elf header of crash image 20 */ 21 unsigned 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 */ setup_elfcorehdr(char * arg)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 } 41 early_param("elfcorehdr", setup_elfcorehdr); 42