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https://github.com/Fishwaldo/u-boot.git
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e604410d3e
All ELF fields whose values are inspected by the code are converted to CPU byteorder first. Values which are copied verbatim (relocation fixups) are not swapped to CPU byteorder and back as it is not needed. Signed-off-by: Marcus Comstedt <marcus@mc.pp.se> Cc: Rick Chen <rick@andestech.com> Reviewed-by: Rick Chen <rick@andestech.com>
98 lines
1.8 KiB
C
98 lines
1.8 KiB
C
// 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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#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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#include <compiler.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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