[linux.git] / kernel / crash_dump.c

// SPDX-License-Identifier: GPL-2.0-only
#include <linux/kernel.h>
#include <linux/crash_dump.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/export.h>

/*
 * stores the physical address of elf header of crash image
 *
 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 * is_kdump_kernel() to determine if we are booting after a panic. Hence put
 * it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 */
unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
EXPORT_SYMBOL_GPL(elfcorehdr_addr);

/*
 * stores the size of elf header of crash image
 */
unsigned long long elfcorehdr_size;

/*
 * elfcorehdr= specifies the location of elf core header stored by the crashed
 * kernel. This option will be passed by kexec loader to the capture kernel.
 *
 * Syntax: elfcorehdr=[size[KMG]@]offset[KMG]
 */
static int __init setup_elfcorehdr(char *arg)
{
	char *end;
	if (!arg)
		return -EINVAL;
	elfcorehdr_addr = memparse(arg, &end);
	if (*end == '@') {
		elfcorehdr_size = elfcorehdr_addr;
		elfcorehdr_addr = memparse(end + 1, &end);
	}
	return end > arg ? 0 : -EINVAL;
}
early_param("elfcorehdr", setup_elfcorehdr);
Commit	Line	Data
457c8996	1	// SPDX-License-Identifier: GPL-2.0-only
93a72052 OH	2	#include <linux/kernel.h>
	3	#include <linux/crash_dump.h>
	4	#include <linux/init.h>
	5	#include <linux/errno.h>
9984de1a	6	#include <linux/export.h>
93a72052	7
93a72052 OH	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;
b3292e88	16	EXPORT_SYMBOL_GPL(elfcorehdr_addr);
93a72052	17
d3bf3795 MH	18	/*
	19	* stores the size of elf header of crash image
	20	*/
	21	unsigned long long elfcorehdr_size;
	22
93a72052 OH	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.
d3bf3795 MH	26	*
d3bf3795 MH	27	* Syntax: elfcorehdr=[size[KMG]@]offset[KMG]
93a72052 OH	28	*/
	29	static int __init setup_elfcorehdr(char *arg)
	30	{
	31	char *end;
	32	if (!arg)
	33	return -EINVAL;
	34	elfcorehdr_addr = memparse(arg, &end);
d3bf3795 MH	35	if (*end == '@') {
	36	elfcorehdr_size = elfcorehdr_addr;
	37	elfcorehdr_addr = memparse(end + 1, &end);
	38	}
93a72052 OH	39	return end > arg ? 0 : -EINVAL;
	40	}
	41	early_param("elfcorehdr", setup_elfcorehdr);