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