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/*
* kexec-elf-loongarch.c - kexec Elf loader for loongarch
*
* Copyright (C) 2022 Loongson Technology Corporation Limited.
* Youling Tang <tangyouling@loongson.cn>
*
* This source code is licensed under the GNU General Public License,
* Version 2. See the file COPYING for more details.
*/
#define _GNU_SOURCE
#include <limits.h>
#include <errno.h>
#include <elf.h>
#include "kexec.h"
#include "kexec-elf.h"
#include "kexec-syscall.h"
#include "crashdump-loongarch.h"
#include "kexec-loongarch.h"
#include "arch/options.h"
off_t initrd_base, initrd_size;
int elf_loongarch_probe(const char *kernel_buf, off_t kernel_size)
{
struct mem_ehdr ehdr;
int result;
result = build_elf_exec_info(kernel_buf, kernel_size, &ehdr, 0);
if (result < 0) {
dbgprintf("%s: Not an ELF executable.\n", __func__);
goto out;
}
/* Verify the architecuture specific bits. */
if (ehdr.e_machine != EM_LOONGARCH) {
dbgprintf("%s: Not an LoongArch ELF executable.\n", __func__);
result = -1;
goto out;
}
result = 0;
out:
free_elf_info(&ehdr);
return result;
}
int elf_loongarch_load(int argc, char **argv, const char *kernel_buf,
off_t kernel_size, struct kexec_info *info)
{
const struct loongarch_image_header *header = NULL;
unsigned long kernel_segment;
struct mem_ehdr ehdr;
int result;
result = build_elf_exec_info(kernel_buf, kernel_size, &ehdr, 0);
if (result < 0) {
dbgprintf("%s: build_elf_exec_info failed\n", __func__);
goto exit;
}
kernel_segment = loongarch_locate_kernel_segment(info);
if (kernel_segment == ULONG_MAX) {
dbgprintf("%s: Kernel segment is not allocated\n", __func__);
result = EFAILED;
goto exit;
}
dbgprintf("%s: kernel_segment: %016lx\n", __func__, kernel_segment);
dbgprintf("%s: image_size: %016lx\n", __func__,
kernel_size);
dbgprintf("%s: text_offset: %016lx\n", __func__,
loongarch_mem.text_offset);
dbgprintf("%s: phys_offset: %016lx\n", __func__,
loongarch_mem.phys_offset);
dbgprintf("%s: PE format: %s\n", __func__,
(loongarch_header_check_pe_sig(header) ? "yes" : "no"));
/* create and initialize elf core header segment */
if (info->kexec_flags & KEXEC_ON_CRASH) {
result = load_crashdump_segments(info);
if (result) {
dbgprintf("%s: Creating eflcorehdr failed.\n",
__func__);
goto exit;
}
}
/* load the kernel */
if (info->kexec_flags & KEXEC_ON_CRASH)
/*
* offset addresses in elf header in order to load
* vmlinux (elf_exec) into crash kernel's memory.
*/
fixup_elf_addrs(&ehdr);
info->entry = (void *)virt_to_phys(ehdr.e_entry);
result = elf_exec_load(&ehdr, info);
if (result) {
dbgprintf("%s: elf_exec_load failed\n", __func__);
goto exit;
}
/* load additional data */
result = loongarch_load_other_segments(info, kernel_segment + kernel_size);
exit:
free_elf_info(&ehdr);
if (result)
fprintf(stderr, "kexec: Bad elf image file, load failed.\n");
return result;
}
void elf_loongarch_usage(void)
{
printf(
" An LoongArch ELF image, little endian.\n"
" Typically vmlinux or a stripped version of vmlinux.\n\n");
}
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