linux/kernel/vmcore_info.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * crash.c - kernel crash support code.
 * Copyright (C) 2002-2004 Eric Biederman  <[email protected]>
 */

#include <linux/buildid.h>
#include <linux/init.h>
#include <linux/utsname.h>
#include <linux/vmalloc.h>
#include <linux/sizes.h>
#include <linux/kexec.h>
#include <linux/memory.h>
#include <linux/cpuhotplug.h>
#include <linux/memblock.h>
#include <linux/kmemleak.h>

#include <asm/page.h>
#include <asm/sections.h>

#include <crypto/sha1.h>

#include "kallsyms_internal.h"
#include "kexec_internal.h"

/* vmcoreinfo stuff */
unsigned char *vmcoreinfo_data;
size_t vmcoreinfo_size;
u32 *vmcoreinfo_note;

/* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */
static unsigned char *vmcoreinfo_data_safecopy;

Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
			  void *data, size_t data_len)
{ … }

void final_note(Elf_Word *buf)
{ … }

static void update_vmcoreinfo_note(void)
{ … }

void crash_update_vmcoreinfo_safecopy(void *ptr)
{ … }

void crash_save_vmcoreinfo(void)
{ … }

void vmcoreinfo_append_str(const char *fmt, ...)
{ … }

/*
 * provide an empty default implementation here -- architecture
 * code may override this
 */
void __weak arch_crash_save_vmcoreinfo(void)
{ … }

phys_addr_t __weak paddr_vmcoreinfo_note(void)
{ … }
EXPORT_SYMBOL(…);

static int __init crash_save_vmcoreinfo_init(void)
{ … }

subsys_initcall(crash_save_vmcoreinfo_init);