419 lines
9.2 KiB
C
419 lines
9.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* MIPS Relocation Data Generator
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*
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* Copyright (c) 2017 Imagination Technologies Ltd.
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*/
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#include <assert.h>
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#include <elf.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <asm/relocs.h>
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#define hdr_field(pfx, idx, field) ({ \
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uint64_t _val; \
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unsigned int _size; \
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\
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if (is_64) { \
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_val = pfx##hdr64[idx].field; \
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_size = sizeof(pfx##hdr64[0].field); \
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} else { \
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_val = pfx##hdr32[idx].field; \
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_size = sizeof(pfx##hdr32[0].field); \
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} \
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\
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switch (_size) { \
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case 1: \
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break; \
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case 2: \
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_val = is_be ? be16toh(_val) : le16toh(_val); \
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break; \
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case 4: \
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_val = is_be ? be32toh(_val) : le32toh(_val); \
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break; \
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case 8: \
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_val = is_be ? be64toh(_val) : le64toh(_val); \
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break; \
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} \
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\
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_val; \
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})
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#define set_hdr_field(pfx, idx, field, val) ({ \
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uint64_t _val; \
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unsigned int _size; \
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\
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if (is_64) \
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_size = sizeof(pfx##hdr64[0].field); \
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else \
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_size = sizeof(pfx##hdr32[0].field); \
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\
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switch (_size) { \
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case 1: \
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_val = val; \
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break; \
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case 2: \
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_val = is_be ? htobe16(val) : htole16(val); \
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break; \
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case 4: \
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_val = is_be ? htobe32(val) : htole32(val); \
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break; \
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case 8: \
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_val = is_be ? htobe64(val) : htole64(val); \
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break; \
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default: \
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/* We should never reach here */ \
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_val = 0; \
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assert(0); \
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break; \
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} \
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\
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if (is_64) \
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pfx##hdr64[idx].field = _val; \
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else \
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pfx##hdr32[idx].field = _val; \
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})
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#define ehdr_field(field) \
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hdr_field(e, 0, field)
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#define phdr_field(idx, field) \
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hdr_field(p, idx, field)
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#define shdr_field(idx, field) \
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hdr_field(s, idx, field)
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#define set_phdr_field(idx, field, val) \
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set_hdr_field(p, idx, field, val)
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#define set_shdr_field(idx, field, val) \
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set_hdr_field(s, idx, field, val)
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#define shstr(idx) (&shstrtab[idx])
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bool is_64, is_be;
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uint64_t text_base;
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struct mips_reloc {
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uint8_t type;
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uint64_t offset;
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} *relocs;
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size_t relocs_sz, relocs_idx;
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static int add_reloc(unsigned int type, uint64_t off)
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{
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struct mips_reloc *new;
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size_t new_sz;
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switch (type) {
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case R_MIPS_NONE:
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case R_MIPS_LO16:
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case R_MIPS_PC16:
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case R_MIPS_HIGHER:
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case R_MIPS_HIGHEST:
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case R_MIPS_PC21_S2:
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case R_MIPS_PC26_S2:
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/* Skip these relocs */
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return 0;
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default:
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break;
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}
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if (relocs_idx == relocs_sz) {
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new_sz = relocs_sz ? relocs_sz * 2 : 128;
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new = realloc(relocs, new_sz * sizeof(*relocs));
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if (!new) {
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fprintf(stderr, "Out of memory\n");
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return -ENOMEM;
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}
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relocs = new;
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relocs_sz = new_sz;
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}
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relocs[relocs_idx++] = (struct mips_reloc){
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.type = type,
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.offset = off,
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};
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return 0;
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}
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static int parse_mips32_rel(const void *_rel)
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{
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const Elf32_Rel *rel = _rel;
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uint32_t off, type;
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off = is_be ? be32toh(rel->r_offset) : le32toh(rel->r_offset);
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off -= text_base;
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type = is_be ? be32toh(rel->r_info) : le32toh(rel->r_info);
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type = ELF32_R_TYPE(type);
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return add_reloc(type, off);
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}
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static int parse_mips64_rela(const void *_rel)
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{
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const Elf64_Rela *rel = _rel;
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uint64_t off, type;
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off = is_be ? be64toh(rel->r_offset) : le64toh(rel->r_offset);
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off -= text_base;
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type = rel->r_info >> (64 - 8);
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return add_reloc(type, off);
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}
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static void output_uint(uint8_t **buf, uint64_t val)
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{
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uint64_t tmp;
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do {
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tmp = val & 0x7f;
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val >>= 7;
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tmp |= !!val << 7;
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*(*buf)++ = tmp;
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} while (val);
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}
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static int compare_relocs(const void *a, const void *b)
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{
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const struct mips_reloc *ra = a, *rb = b;
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return ra->offset - rb->offset;
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}
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int main(int argc, char *argv[])
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{
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unsigned int i, j, i_rel_shdr, sh_type, sh_entsize, sh_entries;
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size_t rel_size, rel_actual_size;
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const char *shstrtab, *sh_name, *rel_pfx;
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int (*parse_fn)(const void *rel);
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uint8_t *buf_start, *buf;
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const Elf32_Ehdr *ehdr32;
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const Elf64_Ehdr *ehdr64;
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uintptr_t sh_offset;
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Elf32_Shdr *shdr32;
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Elf64_Shdr *shdr64;
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struct stat st;
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int err, fd;
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void *elf;
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bool skip;
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fd = open(argv[1], O_RDWR);
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if (fd == -1) {
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fprintf(stderr, "Unable to open input file %s\n", argv[1]);
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err = errno;
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goto out_ret;
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}
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err = fstat(fd, &st);
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if (err) {
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fprintf(stderr, "Unable to fstat() input file\n");
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goto out_close_fd;
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}
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elf = mmap(NULL, st.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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if (elf == MAP_FAILED) {
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fprintf(stderr, "Unable to mmap() input file\n");
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err = errno;
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goto out_close_fd;
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}
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ehdr32 = elf;
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ehdr64 = elf;
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if (memcmp(&ehdr32->e_ident[EI_MAG0], ELFMAG, SELFMAG)) {
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fprintf(stderr, "Input file is not an ELF\n");
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err = -EINVAL;
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goto out_free_relocs;
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}
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if (ehdr32->e_ident[EI_VERSION] != EV_CURRENT) {
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fprintf(stderr, "Unrecognised ELF version\n");
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err = -EINVAL;
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goto out_free_relocs;
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}
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switch (ehdr32->e_ident[EI_CLASS]) {
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case ELFCLASS32:
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is_64 = false;
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break;
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case ELFCLASS64:
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is_64 = true;
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break;
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default:
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fprintf(stderr, "Unrecognised ELF class\n");
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err = -EINVAL;
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goto out_free_relocs;
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}
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switch (ehdr32->e_ident[EI_DATA]) {
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case ELFDATA2LSB:
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is_be = false;
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break;
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case ELFDATA2MSB:
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is_be = true;
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break;
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default:
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fprintf(stderr, "Unrecognised ELF data encoding\n");
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err = -EINVAL;
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goto out_free_relocs;
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}
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if (ehdr_field(e_type) != ET_EXEC) {
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fprintf(stderr, "Input ELF is not an executable\n");
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printf("type 0x%lx\n", ehdr_field(e_type));
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err = -EINVAL;
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goto out_free_relocs;
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}
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if (ehdr_field(e_machine) != EM_MIPS) {
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fprintf(stderr, "Input ELF does not target MIPS\n");
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err = -EINVAL;
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goto out_free_relocs;
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}
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shdr32 = elf + ehdr_field(e_shoff);
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shdr64 = elf + ehdr_field(e_shoff);
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shstrtab = elf + shdr_field(ehdr_field(e_shstrndx), sh_offset);
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i_rel_shdr = UINT_MAX;
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for (i = 0; i < ehdr_field(e_shnum); i++) {
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sh_name = shstr(shdr_field(i, sh_name));
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if (!strcmp(sh_name, ".data.reloc")) {
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i_rel_shdr = i;
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continue;
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}
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if (!strcmp(sh_name, ".text")) {
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text_base = shdr_field(i, sh_addr);
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continue;
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}
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}
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if (i_rel_shdr == UINT_MAX) {
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fprintf(stderr, "Unable to find .rel section\n");
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err = -EINVAL;
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goto out_free_relocs;
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}
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if (!text_base) {
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fprintf(stderr, "Unable to find .text base address\n");
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err = -EINVAL;
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goto out_free_relocs;
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}
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rel_pfx = is_64 ? ".rela." : ".rel.";
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for (i = 0; i < ehdr_field(e_shnum); i++) {
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sh_type = shdr_field(i, sh_type);
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if ((sh_type != SHT_REL) && (sh_type != SHT_RELA))
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continue;
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sh_name = shstr(shdr_field(i, sh_name));
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if (strncmp(sh_name, rel_pfx, strlen(rel_pfx))) {
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if (strcmp(sh_name, ".rel") && strcmp(sh_name, ".rel.dyn"))
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fprintf(stderr, "WARNING: Unexpected reloc section name '%s'\n", sh_name);
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continue;
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}
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/*
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* Skip reloc sections which either don't correspond to another
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* section in the ELF, or whose corresponding section isn't
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* loaded as part of the U-Boot binary (ie. doesn't have the
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* alloc flags set).
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*/
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skip = true;
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for (j = 0; j < ehdr_field(e_shnum); j++) {
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if (strcmp(&sh_name[strlen(rel_pfx) - 1], shstr(shdr_field(j, sh_name))))
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continue;
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skip = !(shdr_field(j, sh_flags) & SHF_ALLOC);
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break;
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}
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if (skip)
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continue;
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sh_offset = shdr_field(i, sh_offset);
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sh_entsize = shdr_field(i, sh_entsize);
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sh_entries = shdr_field(i, sh_size) / sh_entsize;
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if (sh_type == SHT_REL) {
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if (is_64) {
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fprintf(stderr, "REL-style reloc in MIPS64 ELF?\n");
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err = -EINVAL;
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goto out_free_relocs;
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} else {
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parse_fn = parse_mips32_rel;
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}
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} else {
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if (is_64) {
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parse_fn = parse_mips64_rela;
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} else {
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fprintf(stderr, "RELA-style reloc in MIPS32 ELF?\n");
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err = -EINVAL;
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goto out_free_relocs;
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}
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}
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for (j = 0; j < sh_entries; j++) {
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err = parse_fn(elf + sh_offset + (j * sh_entsize));
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if (err)
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goto out_free_relocs;
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}
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}
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/* Sort relocs in ascending order of offset */
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qsort(relocs, relocs_idx, sizeof(*relocs), compare_relocs);
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/* Make reloc offsets relative to their predecessor */
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for (i = relocs_idx - 1; i > 0; i--)
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relocs[i].offset -= relocs[i - 1].offset;
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/* Write the relocations to the .rel section */
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buf = buf_start = elf + shdr_field(i_rel_shdr, sh_offset);
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for (i = 0; i < relocs_idx; i++) {
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output_uint(&buf, relocs[i].type);
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output_uint(&buf, relocs[i].offset >> 2);
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}
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/* Write a terminating R_MIPS_NONE (0) */
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output_uint(&buf, R_MIPS_NONE);
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/* Ensure the relocs didn't overflow the .rel section */
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rel_size = shdr_field(i_rel_shdr, sh_size);
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rel_actual_size = buf - buf_start;
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if (rel_actual_size > rel_size) {
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fprintf(stderr, "Relocations overflow available space of 0x%lx (required 0x%lx)!\n",
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rel_size, rel_actual_size);
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fprintf(stderr, "Please adjust CONFIG_MIPS_RELOCATION_TABLE_SIZE to at least 0x%lx\n",
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(rel_actual_size + 0x100) & ~0xFF);
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err = -ENOMEM;
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goto out_free_relocs;
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}
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/* Make sure data is written back to the file */
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err = msync(elf, st.st_size, MS_SYNC);
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if (err) {
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fprintf(stderr, "Failed to msync: %d\n", errno);
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goto out_free_relocs;
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}
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out_free_relocs:
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free(relocs);
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munmap(elf, st.st_size);
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out_close_fd:
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close(fd);
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out_ret:
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return err;
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}
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