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// 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);
kexec_dprintk("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;
kexec_dprintk("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;
kexec_dprintk("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
};
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