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86 lines
2.1 KiB
86 lines
2.1 KiB
// 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 <[email protected]> |
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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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