1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2017 Andes Technology 4 * Chih-Mao Chen <cmchen (at) andestech.com> 5 * 6 * Statically process runtime relocations on RISC-V ELF images 7 * so that it can be directly executed when loaded at LMA 8 * without fixup. Both RV32 and RV64 are supported. 9 */ 10 11 #if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__ 12 #error "Only little-endian host is supported" 13 #endif 14 15 #include <errno.h> 16 #include <stdbool.h> 17 #include <stdint.h> 18 #include <stdio.h> 19 #include <stdlib.h> 20 #include <string.h> 21 22 #include <elf.h> 23 #include <fcntl.h> 24 #include <sys/mman.h> 25 #include <sys/stat.h> 26 #include <sys/types.h> 27 #include <unistd.h> 28 29 #ifndef EM_RISCV 30 #define EM_RISCV 243 31 #endif 32 33 #ifndef R_RISCV_32 34 #define R_RISCV_32 1 35 #endif 36 37 #ifndef R_RISCV_64 38 #define R_RISCV_64 2 39 #endif 40 41 #ifndef R_RISCV_RELATIVE 42 #define R_RISCV_RELATIVE 3 43 #endif 44 45 const char *argv0; 46 47 #define die(fmt, ...) \ 48 do { \ 49 fprintf(stderr, "%s: " fmt "\n", argv0, ## __VA_ARGS__); \ 50 exit(EXIT_FAILURE); \ 51 } while (0) 52 53 #define PRELINK_INC_BITS 32 54 #include "prelink-riscv.inc" 55 #undef PRELINK_INC_BITS 56 57 #define PRELINK_INC_BITS 64 58 #include "prelink-riscv.inc" 59 #undef PRELINK_INC_BITS 60 61 int main(int argc, const char *const *argv) 62 { 63 argv0 = argv[0]; 64 65 if (argc < 2) { 66 fprintf(stderr, "Usage: %s <u-boot>\n", argv0); 67 exit(EXIT_FAILURE); 68 } 69 70 int fd = open(argv[1], O_RDWR, 0); 71 72 if (fd < 0) 73 die("Cannot open %s: %s", argv[1], strerror(errno)); 74 75 struct stat st; 76 77 if (fstat(fd, &st) < 0) 78 die("Cannot stat %s: %s", argv[1], strerror(errno)); 79 80 void *data = 81 mmap(0, st.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 82 83 if (data == MAP_FAILED) 84 die("Cannot mmap %s: %s", argv[1], strerror(errno)); 85 86 close(fd); 87 88 unsigned char *e_ident = (unsigned char *)data; 89 90 if (memcmp(e_ident, ELFMAG, SELFMAG) != 0) 91 die("Invalid ELF file %s", argv[1]); 92 93 bool is64 = e_ident[EI_CLASS] == ELFCLASS64; 94 95 if (is64) 96 prelink64(data); 97 else 98 prelink32(data); 99 100 return 0; 101 } 102
