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