Uwe Hermann | 7eb845e | 2008-11-02 17:01:06 +0000 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the bayou project. |
| 3 | * |
| 4 | * Copyright (C) 2008 Advanced Micro Devices, Inc. |
| 5 | * |
| 6 | * Includes code from util/lar from coreboot-v3 |
| 7 | * |
| 8 | * Copyright (C) 2006-2007 coresystems GmbH |
| 9 | * Copyright (C) 2007 Patrick Georgi <patrick@georgi-clan.de> |
| 10 | * Copyright (C) 2007 Advanced Micro Devices, Inc. |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License version 2 as |
| 14 | * published by the Free Software Foundation. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | */ |
| 21 | |
| 22 | #include <stdio.h> |
| 23 | #include <string.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <sys/stat.h> |
Stefan Reinauer | 7b76912 | 2010-04-20 23:04:46 +0000 | [diff] [blame] | 26 | #include "elf.h" |
Uwe Hermann | 7eb845e | 2008-11-02 17:01:06 +0000 | [diff] [blame] | 27 | #include <sys/mman.h> |
| 28 | #include <unistd.h> |
| 29 | #include <fcntl.h> |
| 30 | #include <stdint.h> |
| 31 | |
| 32 | typedef uint64_t u64; |
| 33 | typedef int64_t s64; |
| 34 | typedef uint32_t u32; |
| 35 | typedef int32_t s32; |
| 36 | typedef uint8_t u8; |
| 37 | |
| 38 | #include "self.h" |
| 39 | |
| 40 | int elf_to_self(const char *filename, unsigned char **buffer, |
| 41 | void (*compress) (char *, int, char *, int *)) |
| 42 | { |
| 43 | struct stat s; |
| 44 | Elf32_Phdr *phdr; |
| 45 | Elf32_Ehdr *ehdr; |
| 46 | Elf32_Shdr *shdr; |
| 47 | void *filep; |
| 48 | char *header, *strtab; |
| 49 | unsigned char *sptr; |
| 50 | int headers, segments = 1, isize = 0, osize = 0, doffset = 0, fd, i; |
| 51 | struct self_segment *segs; |
| 52 | |
| 53 | if (stat(filename, &s)) { |
| 54 | printf("Unable to stat %s: %m\n", filename); |
| 55 | return -1; |
| 56 | } |
| 57 | |
| 58 | fd = open(filename, O_RDONLY); |
| 59 | |
| 60 | if (fd == -1) { |
| 61 | printf("Unable to open %s: %m\n", filename); |
| 62 | return -1; |
| 63 | } |
| 64 | |
| 65 | /* Map the file so that we can easily parse it. */ |
| 66 | filep = (void *) |
| 67 | mmap(0, s.st_size, PROT_READ, MAP_SHARED, fd, 0); |
| 68 | |
| 69 | if (filep == MAP_FAILED) { |
| 70 | close(fd); |
| 71 | return -1; |
| 72 | } |
| 73 | |
| 74 | ehdr = (Elf32_Ehdr *) filep; |
| 75 | headers = ehdr->e_phnum; |
| 76 | header = (char *)ehdr; |
| 77 | |
| 78 | phdr = (Elf32_Phdr *) & (header[ehdr->e_phoff]); |
| 79 | shdr = (Elf32_Shdr *) & (header[ehdr->e_shoff]); |
| 80 | |
| 81 | strtab = &header[shdr[ehdr->e_shstrndx].sh_offset]; |
| 82 | |
| 83 | /* Count number of headers - look for the .notes.pinfo section. */ |
| 84 | for (i = 0; i < ehdr->e_shnum; i++) { |
| 85 | char *name; |
| 86 | |
| 87 | if (i == ehdr->e_shstrndx) |
| 88 | continue; |
| 89 | |
| 90 | if (shdr[i].sh_size == 0) |
| 91 | continue; |
| 92 | |
| 93 | name = (char *)(strtab + shdr[i].sh_name); |
| 94 | |
| 95 | if (!strcmp(name, ".note.pinfo")) |
| 96 | segments++; |
| 97 | } |
| 98 | |
| 99 | /* |
| 100 | * Now, regular headers - we only care about PT_LOAD headers, |
| 101 | * because thats what we're actually going to load. |
| 102 | */ |
| 103 | for (i = 0; i < headers; i++) { |
| 104 | if (phdr[i].p_type != PT_LOAD) |
| 105 | continue; |
| 106 | |
| 107 | /* Empty segments are never interesting. */ |
| 108 | if (phdr[i].p_memsz == 0) |
| 109 | continue; |
| 110 | |
| 111 | isize += phdr[i].p_filesz; |
| 112 | segments++; |
| 113 | } |
| 114 | |
| 115 | /* Allocate a block of memory to store the SELF in. */ |
| 116 | sptr = calloc((segments * sizeof(struct self_segment)) + isize, 1); |
| 117 | doffset = (segments * sizeof(struct self_segment)); |
| 118 | |
| 119 | if (sptr == NULL) |
| 120 | goto err; |
| 121 | |
| 122 | segs = (struct self_segment *)sptr; |
| 123 | segments = 0; |
| 124 | |
| 125 | for (i = 0; i < ehdr->e_shnum; i++) { |
| 126 | char *name; |
| 127 | |
| 128 | if (i == ehdr->e_shstrndx) |
| 129 | continue; |
| 130 | |
| 131 | if (shdr[i].sh_size == 0) |
| 132 | continue; |
| 133 | |
| 134 | name = (char *)(strtab + shdr[i].sh_name); |
| 135 | |
| 136 | if (!strcmp(name, ".note.pinfo")) { |
| 137 | segs[segments].type = SELF_TYPE_PARAMS; |
| 138 | segs[segments].load_addr = 0; |
| 139 | segs[segments].len = (u32) shdr[i].sh_size; |
| 140 | segs[segments].offset = doffset; |
| 141 | |
| 142 | memcpy((unsigned long *)(sptr + doffset), |
| 143 | &header[shdr[i].sh_offset], shdr[i].sh_size); |
| 144 | |
| 145 | doffset += segs[segments].len; |
| 146 | osize += segs[segments].len; |
| 147 | |
| 148 | segments++; |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | for (i = 0; i < headers; i++) { |
| 153 | if (phdr[i].p_type != PT_LOAD) |
| 154 | continue; |
| 155 | |
| 156 | if (phdr[i].p_memsz == 0) |
| 157 | continue; |
| 158 | |
| 159 | segs[segments].type = SELF_TYPE_DATA; |
| 160 | segs[segments].load_addr = (u64) phdr[i].p_paddr; |
| 161 | segs[segments].mem_len = (u32) phdr[i].p_memsz; |
| 162 | segs[segments].offset = doffset; |
| 163 | |
| 164 | compress((char *)&header[phdr[i].p_offset], |
| 165 | phdr[i].p_filesz, |
| 166 | (char *)(sptr + doffset), (int *)&segs[segments].len); |
| 167 | |
| 168 | doffset += segs[segments].len; |
| 169 | osize += segs[segments].len; |
| 170 | |
| 171 | segments++; |
| 172 | } |
| 173 | |
| 174 | segs[segments].type = SELF_TYPE_ENTRY; |
| 175 | segs[segments++].load_addr = (unsigned long long)ehdr->e_entry; |
| 176 | |
| 177 | *buffer = sptr; |
| 178 | |
| 179 | munmap(filep, s.st_size); |
| 180 | close(fd); |
| 181 | |
| 182 | return (segments * sizeof(struct self_segment)) + osize; |
| 183 | |
| 184 | err: |
| 185 | munmap(filep, s.st_size); |
| 186 | close(fd); |
| 187 | |
| 188 | return -1; |
| 189 | } |
| 190 | |
| 191 | int iself(char *filename) |
| 192 | { |
| 193 | Elf32_Ehdr ehdr; |
| 194 | int fd = open(filename, O_RDONLY); |
| 195 | int ret = 0; |
| 196 | |
| 197 | if (fd == -1) |
| 198 | return 0; |
| 199 | |
| 200 | if (read(fd, &ehdr, sizeof(ehdr)) == sizeof(ehdr)) |
| 201 | ret = !memcmp(ehdr.e_ident, ELFMAG, 4); |
| 202 | |
| 203 | close(fd); |
| 204 | |
| 205 | return ret; |
| 206 | } |