Cregit: Linux 6.13: elfcorehdr.c

Contributors: 13
Author	Tokens	Token Proportion	Commits	Commit Proportion
Michael Holzheu	28	25.00%	1	5.26%
Vivek Goyal	18	16.07%	3	15.79%
Simon Horman	16	14.29%	1	5.26%
Yinghai Lu	12	10.71%	4	21.05%
Olaf Hering	9	8.04%	1	5.26%
Andi Kleen	8	7.14%	2	10.53%
Andrew Morton	5	4.46%	1	5.26%
Amir Vadai	5	4.46%	1	5.26%
Mika Westerberg	5	4.46%	1	5.26%
Ingo Molnar	3	2.68%	1	5.26%
Paul Gortmaker	1	0.89%	1	5.26%
Thomas Gleixner	1	0.89%	1	5.26%
Rusty Russell	1	0.89%	1	5.26%
Total	112		19

// 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);