mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-20 17:08:52 +09:00
![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
433 lines
9.5 KiB
C
433 lines
9.5 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, load_sz;
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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_Phdr *phdr32;
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Elf64_Phdr *phdr64;
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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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phdr32 = elf + ehdr_field(e_phoff);
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phdr64 = elf + ehdr_field(e_phoff);
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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, ".rel")) {
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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, "Relocs overflowed .rel section\n");
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return -ENOMEM;
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}
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/* Update the .rel section's size */
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set_shdr_field(i_rel_shdr, sh_size, rel_actual_size);
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/* Shrink the PT_LOAD program header filesz (ie. shrink u-boot.bin) */
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for (i = 0; i < ehdr_field(e_phnum); i++) {
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if (phdr_field(i, p_type) != PT_LOAD)
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continue;
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load_sz = phdr_field(i, p_filesz);
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load_sz -= rel_size - rel_actual_size;
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set_phdr_field(i, p_filesz, load_sz);
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break;
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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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