prelink-riscv.c
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/*
* Copyright (C) 2017 Andes Technology
* Chih-Mao Chen <cmchen@andestech.com>
*
* SPDX-License-Identifier: GPL-2.0+
*
* Statically process runtime relocations on RISC-V ELF images
* so that it can be directly executed when loaded at LMA
* without fixup. Both RV32 and RV64 are supported.
*/
#if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
#error "Only little-endian host is supported"
#endif
#include <errno.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <elf.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#ifndef EM_RISCV
#define EM_RISCV 243
#endif
#ifndef R_RISCV_32
#define R_RISCV_32 1
#endif
#ifndef R_RISCV_64
#define R_RISCV_64 2
#endif
#ifndef R_RISCV_RELATIVE
#define R_RISCV_RELATIVE 3
#endif
const char *argv0;
#define die(fmt, ...) \
do { \
fprintf(stderr, "%s: " fmt "\n", argv0, ## __VA_ARGS__); \
exit(EXIT_FAILURE); \
} while (0)
#define PRELINK_INC_BITS 32
#include "prelink-riscv.inc"
#undef PRELINK_INC_BITS
#define PRELINK_INC_BITS 64
#include "prelink-riscv.inc"
#undef PRELINK_INC_BITS
int main(int argc, const char *const *argv)
{
argv0 = argv[0];
if (argc < 2) {
fprintf(stderr, "Usage: %s <u-boot>\n", argv0);
exit(EXIT_FAILURE);
}
int fd = open(argv[1], O_RDWR, 0);
if (fd < 0)
die("Cannot open %s: %s", argv[1], strerror(errno));
struct stat st;
if (fstat(fd, &st) < 0)
die("Cannot stat %s: %s", argv[1], strerror(errno));
void *data =
mmap(0, st.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (data == MAP_FAILED)
die("Cannot mmap %s: %s", argv[1], strerror(errno));
close(fd);
unsigned char *e_ident = (unsigned char *)data;
if (memcmp(e_ident, ELFMAG, SELFMAG) != 0)
die("Invalid ELF file %s", argv[1]);
bool is64 = e_ident[EI_CLASS] == ELFCLASS64;
if (is64)
prelink64(data);
else
prelink32(data);
return 0;
}