mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-25 05:04:09 +08:00
1191cf4986
Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Load ELF vmlinux file for the kexec_file_load syscall.
|
|
*
|
|
* Copyright (c) 2019 Sven Schnelle <svens@stackframe.org>
|
|
*
|
|
*/
|
|
#include <linux/elf.h>
|
|
#include <linux/kexec.h>
|
|
#include <linux/libfdt.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_fdt.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/types.h>
|
|
|
|
static void *elf_load(struct kimage *image, char *kernel_buf,
|
|
unsigned long kernel_len, char *initrd,
|
|
unsigned long initrd_len, char *cmdline,
|
|
unsigned long cmdline_len)
|
|
{
|
|
int ret, i;
|
|
unsigned long kernel_load_addr;
|
|
struct elfhdr ehdr;
|
|
struct kexec_elf_info elf_info;
|
|
struct kexec_buf kbuf = { .image = image, .buf_min = 0,
|
|
.buf_max = -1UL, };
|
|
|
|
ret = kexec_build_elf_info(kernel_buf, kernel_len, &ehdr, &elf_info);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = kexec_elf_load(image, &ehdr, &elf_info, &kbuf, &kernel_load_addr);
|
|
if (ret)
|
|
goto out;
|
|
|
|
image->start = __pa(elf_info.ehdr->e_entry);
|
|
|
|
for (i = 0; i < image->nr_segments; i++)
|
|
image->segment[i].mem = __pa(image->segment[i].mem);
|
|
|
|
pr_debug("Loaded the kernel at 0x%lx, entry at 0x%lx\n",
|
|
kernel_load_addr, image->start);
|
|
|
|
if (initrd != NULL) {
|
|
kbuf.buffer = initrd;
|
|
kbuf.bufsz = kbuf.memsz = initrd_len;
|
|
kbuf.buf_align = PAGE_SIZE;
|
|
kbuf.top_down = false;
|
|
kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
|
|
ret = kexec_add_buffer(&kbuf);
|
|
if (ret)
|
|
goto out;
|
|
|
|
pr_debug("Loaded initrd at 0x%lx\n", kbuf.mem);
|
|
image->arch.initrd_start = kbuf.mem;
|
|
image->arch.initrd_end = kbuf.mem + initrd_len;
|
|
}
|
|
|
|
if (cmdline != NULL) {
|
|
kbuf.buffer = cmdline;
|
|
kbuf.bufsz = kbuf.memsz = ALIGN(cmdline_len, 8);
|
|
kbuf.buf_align = PAGE_SIZE;
|
|
kbuf.top_down = false;
|
|
kbuf.buf_min = PAGE0->mem_free + PAGE_SIZE;
|
|
kbuf.buf_max = kernel_load_addr;
|
|
kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
|
|
ret = kexec_add_buffer(&kbuf);
|
|
if (ret)
|
|
goto out;
|
|
|
|
pr_debug("Loaded cmdline at 0x%lx\n", kbuf.mem);
|
|
image->arch.cmdline = kbuf.mem;
|
|
}
|
|
out:
|
|
return NULL;
|
|
}
|
|
|
|
const struct kexec_file_ops kexec_elf_ops = {
|
|
.probe = kexec_elf_probe,
|
|
.load = elf_load,
|
|
};
|
|
|
|
const struct kexec_file_ops * const kexec_file_loaders[] = {
|
|
&kexec_elf_ops,
|
|
NULL
|
|
};
|