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tools/relocate-rela.c
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/* * Copyright 2013 Freescale Semiconductor, Inc. * * SPDX-License-Identifier: GPL-2.0+ BSD-2-Clause * * 64-bit and little-endian target only until we need to support a different * arch that needs this. */ #include <elf.h> #include <errno.h> #include <inttypes.h> #include <stdarg.h> #include <stdbool.h> #include <stdio.h> #include <stdlib.h> #include <string.h> |
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#include "compiler.h" |
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#ifndef R_AARCH64_RELATIVE #define R_AARCH64_RELATIVE 1027 #endif static const bool debug_en; static void debug(const char *fmt, ...) { va_list args; |
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if (debug_en) { va_start(args, fmt); |
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vprintf(fmt, args); |
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va_end(args); } |
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} static bool supported_rela(Elf64_Rela *rela) { uint64_t mask = 0xffffffffULL; /* would be different on 32-bit */ uint32_t type = rela->r_info & mask; switch (type) { #ifdef R_AARCH64_RELATIVE case R_AARCH64_RELATIVE: return true; #endif default: fprintf(stderr, "warning: unsupported relocation type %" PRIu32 " at %" PRIx64 " ", type, rela->r_offset); return false; } } |
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static bool read_num(const char *str, uint64_t *num) { char *endptr; *num = strtoull(str, &endptr, 16); return str[0] && !endptr[0]; } int main(int argc, char **argv) { FILE *f; int i, num; uint64_t rela_start, rela_end, text_base; if (argc != 5) { fprintf(stderr, "Statically apply ELF rela relocations "); fprintf(stderr, "Usage: %s <bin file> <text base> " \ "<rela start> <rela end> ", argv[0]); fprintf(stderr, "All numbers in hex. "); return 1; } f = fopen(argv[1], "r+b"); if (!f) { fprintf(stderr, "%s: Cannot open %s: %s ", argv[0], argv[1], strerror(errno)); return 2; } if (!read_num(argv[2], &text_base) || !read_num(argv[3], &rela_start) || !read_num(argv[4], &rela_end)) { fprintf(stderr, "%s: bad number ", argv[0]); return 3; } if (rela_start > rela_end || rela_start < text_base || |
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(rela_end - rela_start) % sizeof(Elf64_Rela)) { |
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fprintf(stderr, "%s: bad rela bounds ", argv[0]); return 3; } rela_start -= text_base; rela_end -= text_base; num = (rela_end - rela_start) / sizeof(Elf64_Rela); for (i = 0; i < num; i++) { Elf64_Rela rela, swrela; uint64_t pos = rela_start + sizeof(Elf64_Rela) * i; uint64_t addr; if (fseek(f, pos, SEEK_SET) < 0) { fprintf(stderr, "%s: %s: seek to %" PRIx64 " failed: %s ", argv[0], argv[1], pos, strerror(errno)); } if (fread(&rela, sizeof(rela), 1, f) != 1) { fprintf(stderr, "%s: %s: read rela failed at %" PRIx64 " ", argv[0], argv[1], pos); return 4; } |
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swrela.r_offset = cpu_to_le64(rela.r_offset); swrela.r_info = cpu_to_le64(rela.r_info); swrela.r_addend = cpu_to_le64(rela.r_addend); |
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if (!supported_rela(&swrela)) continue; debug("Rela %" PRIx64 " %" PRIu64 " %" PRIx64 " ", swrela.r_offset, swrela.r_info, swrela.r_addend); if (swrela.r_offset < text_base) { fprintf(stderr, "%s: %s: bad rela at %" PRIx64 " ", argv[0], argv[1], pos); return 4; } addr = swrela.r_offset - text_base; if (fseek(f, addr, SEEK_SET) < 0) { fprintf(stderr, "%s: %s: seek to %" PRIx64 " failed: %s ", argv[0], argv[1], addr, strerror(errno)); } if (fwrite(&rela.r_addend, sizeof(rela.r_addend), 1, f) != 1) { fprintf(stderr, "%s: %s: write failed at %" PRIx64 " ", argv[0], argv[1], addr); return 4; } } if (fclose(f) < 0) { fprintf(stderr, "%s: %s: close failed: %s ", argv[0], argv[1], strerror(errno)); return 4; } return 0; } |