load_elf.cpp revision 1.1.2.3
1 1.1.2.3 bouyer /* $NetBSD: load_elf.cpp,v 1.1.2.3 2001/03/27 15:30:48 bouyer Exp $ */ 2 1.1.2.2 bouyer 3 1.1.2.2 bouyer /*- 4 1.1.2.2 bouyer * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 1.1.2.2 bouyer * All rights reserved. 6 1.1.2.2 bouyer * 7 1.1.2.2 bouyer * This code is derived from software contributed to The NetBSD Foundation 8 1.1.2.2 bouyer * by UCHIYAMA Yasushi. 9 1.1.2.2 bouyer * 10 1.1.2.2 bouyer * Redistribution and use in source and binary forms, with or without 11 1.1.2.2 bouyer * modification, are permitted provided that the following conditions 12 1.1.2.2 bouyer * are met: 13 1.1.2.2 bouyer * 1. Redistributions of source code must retain the above copyright 14 1.1.2.2 bouyer * notice, this list of conditions and the following disclaimer. 15 1.1.2.2 bouyer * 2. Redistributions in binary form must reproduce the above copyright 16 1.1.2.2 bouyer * notice, this list of conditions and the following disclaimer in the 17 1.1.2.2 bouyer * documentation and/or other materials provided with the distribution. 18 1.1.2.2 bouyer * 3. All advertising materials mentioning features or use of this software 19 1.1.2.2 bouyer * must display the following acknowledgement: 20 1.1.2.2 bouyer * This product includes software developed by the NetBSD 21 1.1.2.2 bouyer * Foundation, Inc. and its contributors. 22 1.1.2.2 bouyer * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.1.2.2 bouyer * contributors may be used to endorse or promote products derived 24 1.1.2.2 bouyer * from this software without specific prior written permission. 25 1.1.2.2 bouyer * 26 1.1.2.2 bouyer * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.1.2.2 bouyer * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.1.2.2 bouyer * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.1.2.2 bouyer * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.1.2.2 bouyer * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.1.2.2 bouyer * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.1.2.2 bouyer * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.1.2.2 bouyer * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.1.2.2 bouyer * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.1.2.2 bouyer * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.1.2.2 bouyer * POSSIBILITY OF SUCH DAMAGE. 37 1.1.2.2 bouyer */ 38 1.1.2.2 bouyer 39 1.1.2.2 bouyer #include <load.h> 40 1.1.2.2 bouyer #include <load_elf.h> 41 1.1.2.2 bouyer #include <console.h> 42 1.1.2.2 bouyer #include <memory.h> 43 1.1.2.2 bouyer #include <file.h> 44 1.1.2.2 bouyer 45 1.1.2.2 bouyer ElfLoader::ElfLoader(Console *&cons, MemoryManager *&mem) 46 1.1.2.2 bouyer : Loader(cons, mem) 47 1.1.2.2 bouyer { 48 1.1.2.2 bouyer DPRINTF((TEXT("Loader: ELF\n"))); 49 1.1.2.2 bouyer } 50 1.1.2.2 bouyer 51 1.1.2.2 bouyer ElfLoader::~ElfLoader(void) 52 1.1.2.2 bouyer { 53 1.1.2.2 bouyer } 54 1.1.2.2 bouyer 55 1.1.2.2 bouyer BOOL 56 1.1.2.2 bouyer ElfLoader::setFile(File *&file) 57 1.1.2.2 bouyer { 58 1.1.2.3 bouyer size_t sz; 59 1.1.2.2 bouyer Loader::setFile(file); 60 1.1.2.2 bouyer 61 1.1.2.2 bouyer /* read ELF header and check it */ 62 1.1.2.2 bouyer if (!read_header()) 63 1.1.2.2 bouyer return FALSE; 64 1.1.2.3 bouyer /* read section header */ 65 1.1.2.3 bouyer sz = _eh.e_shnum * _eh.e_shentsize; 66 1.1.2.3 bouyer _file->read(_sh, _eh.e_shentsize * _eh.e_shnum, _eh.e_shoff); 67 1.1.2.3 bouyer 68 1.1.2.2 bouyer /* read program header */ 69 1.1.2.3 bouyer sz = _eh.e_phnum * _eh.e_phentsize; 70 1.1.2.2 bouyer 71 1.1.2.2 bouyer return _file->read(_ph, sz, _eh.e_phoff) == sz; 72 1.1.2.2 bouyer } 73 1.1.2.2 bouyer 74 1.1.2.2 bouyer size_t 75 1.1.2.2 bouyer ElfLoader::memorySize() 76 1.1.2.2 bouyer { 77 1.1.2.2 bouyer int i; 78 1.1.2.2 bouyer Elf_Phdr *ph = _ph; 79 1.1.2.2 bouyer size_t sz = 0; 80 1.1.2.2 bouyer 81 1.1.2.2 bouyer DPRINTF((TEXT("file size: "))); 82 1.1.2.2 bouyer for (i = 0; i < _eh.e_phnum; i++, ph++) { 83 1.1.2.2 bouyer if (ph->p_type == PT_LOAD) { 84 1.1.2.2 bouyer size_t filesz = ph->p_filesz; 85 1.1.2.2 bouyer DPRINTF((TEXT("+0x%x"), filesz)); 86 1.1.2.2 bouyer sz += _mem->roundPage(filesz); 87 1.1.2.2 bouyer } 88 1.1.2.2 bouyer } 89 1.1.2.3 bouyer /* XXX reserve 192kB for symbols */ 90 1.1.2.3 bouyer sz += 0x30000; 91 1.1.2.3 bouyer 92 1.1.2.2 bouyer DPRINTF((TEXT(" = 0x%x byte\n"), sz)); 93 1.1.2.2 bouyer return sz; 94 1.1.2.2 bouyer } 95 1.1.2.2 bouyer 96 1.1.2.2 bouyer kaddr_t 97 1.1.2.2 bouyer ElfLoader::jumpAddr() 98 1.1.2.2 bouyer { 99 1.1.2.2 bouyer DPRINTF((TEXT("kernel entry address: 0x%08x\n"), _eh.e_entry)); 100 1.1.2.2 bouyer return _eh.e_entry; 101 1.1.2.2 bouyer } 102 1.1.2.2 bouyer 103 1.1.2.2 bouyer BOOL 104 1.1.2.2 bouyer ElfLoader::load() 105 1.1.2.2 bouyer { 106 1.1.2.2 bouyer Elf_Phdr *ph; 107 1.1.2.3 bouyer Elf_Shdr *sh, *shstr, *shsym; 108 1.1.2.3 bouyer off_t stroff = 0, symoff = 0, off; 109 1.1.2.3 bouyer vaddr_t kv; 110 1.1.2.3 bouyer size_t shstrsize; 111 1.1.2.3 bouyer char buf[1024]; 112 1.1.2.2 bouyer int i; 113 1.1.2.2 bouyer 114 1.1.2.2 bouyer _load_segment_start(); 115 1.1.2.2 bouyer 116 1.1.2.2 bouyer for (i = 0, ph = _ph; i < _eh.e_phnum; i++, ph++) { 117 1.1.2.2 bouyer if (ph->p_type == PT_LOAD) { 118 1.1.2.2 bouyer size_t filesz = ph->p_filesz; 119 1.1.2.2 bouyer size_t memsz = ph->p_memsz; 120 1.1.2.3 bouyer kv = ph->p_vaddr; 121 1.1.2.2 bouyer off_t fileofs = ph->p_offset; 122 1.1.2.2 bouyer DPRINTF((TEXT("[%d] vaddr 0x%08x file size 0x%x mem size 0x%x\n"), 123 1.1.2.2 bouyer i, kv, filesz, memsz)); 124 1.1.2.2 bouyer _load_segment(kv, memsz, fileofs, filesz); 125 1.1.2.3 bouyer kv += memsz; 126 1.1.2.2 bouyer } 127 1.1.2.2 bouyer } 128 1.1.2.3 bouyer 129 1.1.2.3 bouyer /* 130 1.1.2.3 bouyer * Prepare ELF headers for symbol table. 131 1.1.2.3 bouyer * 132 1.1.2.3 bouyer * ELF header 133 1.1.2.3 bouyer * section header 134 1.1.2.3 bouyer * shstrtab 135 1.1.2.3 bouyer * strtab 136 1.1.2.3 bouyer * symtab 137 1.1.2.3 bouyer */ 138 1.1.2.3 bouyer memcpy(buf, &_eh, sizeof(_eh)); 139 1.1.2.3 bouyer ((Elf_Ehdr *)buf)->e_phoff = 0; 140 1.1.2.3 bouyer ((Elf_Ehdr *)buf)->e_phnum = 0; 141 1.1.2.3 bouyer ((Elf_Ehdr *)buf)->e_entry = 0; 142 1.1.2.3 bouyer ((Elf_Ehdr *)buf)->e_shoff = sizeof(_eh); 143 1.1.2.3 bouyer off = ((Elf_Ehdr *)buf)->e_shoff; 144 1.1.2.3 bouyer memcpy(buf + off, _sh, _eh.e_shentsize * _eh.e_shnum); 145 1.1.2.3 bouyer sh = (Elf_Shdr *)(buf + off); 146 1.1.2.3 bouyer off += _eh.e_shentsize * _eh.e_shnum; 147 1.1.2.3 bouyer 148 1.1.2.3 bouyer /* load shstrtab and find desired sections */ 149 1.1.2.3 bouyer shstrsize = (sh[_eh.e_shstrndx].sh_size + 3) & ~0x3; 150 1.1.2.3 bouyer _file->read(buf + off, shstrsize, sh[_eh.e_shstrndx].sh_offset); 151 1.1.2.3 bouyer for(i = 0; i < _eh.e_shnum; i++, sh++) { 152 1.1.2.3 bouyer if (strcmp(".strtab", buf + off + sh->sh_name) == 0) { 153 1.1.2.3 bouyer stroff = sh->sh_offset; 154 1.1.2.3 bouyer shstr = sh; 155 1.1.2.3 bouyer } else if (strcmp(".symtab", buf + off + sh->sh_name) == 0) { 156 1.1.2.3 bouyer symoff = sh->sh_offset; 157 1.1.2.3 bouyer shsym = sh; 158 1.1.2.3 bouyer } 159 1.1.2.3 bouyer if (i == _eh.e_shstrndx) 160 1.1.2.3 bouyer sh->sh_offset = off; 161 1.1.2.3 bouyer else 162 1.1.2.3 bouyer sh->sh_offset = 0; 163 1.1.2.3 bouyer } 164 1.1.2.3 bouyer /* silently return if strtab or symtab can't be found */ 165 1.1.2.3 bouyer if (! stroff || ! symoff) 166 1.1.2.3 bouyer return TRUE; 167 1.1.2.3 bouyer 168 1.1.2.3 bouyer shstr->sh_offset = off + shstrsize; 169 1.1.2.3 bouyer shsym->sh_offset = off + shstrsize + ((shstr->sh_size + 3) & ~0x3); 170 1.1.2.3 bouyer _load_memory(kv, off + shstrsize, buf); 171 1.1.2.3 bouyer kv += off + shstrsize; 172 1.1.2.3 bouyer _load_segment(kv, shstr->sh_size, stroff, shstr->sh_size); 173 1.1.2.3 bouyer kv += (shstr->sh_size + 3) & ~0x3; 174 1.1.2.3 bouyer _load_segment(kv, shsym->sh_size, symoff, shsym->sh_size); 175 1.1.2.3 bouyer 176 1.1.2.2 bouyer /* tag chain still opening */ 177 1.1.2.2 bouyer 178 1.1.2.2 bouyer return TRUE; 179 1.1.2.2 bouyer } 180 1.1.2.2 bouyer 181 1.1.2.2 bouyer BOOL 182 1.1.2.2 bouyer ElfLoader::read_header(void) 183 1.1.2.2 bouyer { 184 1.1.2.2 bouyer // read ELF header 185 1.1.2.2 bouyer _file->read(&_eh, sizeof(Elf_Ehdr), 0); 186 1.1.2.2 bouyer 187 1.1.2.2 bouyer // check ELF Magic. 188 1.1.2.2 bouyer if (!is_elf_file()) { 189 1.1.2.2 bouyer DPRINTF((TEXT("not a ELF file.\n"))); 190 1.1.2.2 bouyer return FALSE; 191 1.1.2.2 bouyer } 192 1.1.2.2 bouyer 193 1.1.2.2 bouyer // Windows CE is 32bit little-endian only. 194 1.1.2.2 bouyer if (_eh.e_ident[EI_DATA] != ELFDATA2LSB || 195 1.1.2.2 bouyer _eh.e_ident[EI_CLASS] != ELFCLASS32) { 196 1.1.2.2 bouyer DPRINTF((TEXT("invalid class/data(%d/%d)\n"), 197 1.1.2.2 bouyer _eh.e_ident[EI_CLASS], _eh.e_ident[EI_DATA])); 198 1.1.2.2 bouyer return FALSE; 199 1.1.2.2 bouyer } 200 1.1.2.2 bouyer 201 1.1.2.2 bouyer // Is native architecture? 202 1.1.2.2 bouyer switch(_eh.e_machine) { 203 1.1.2.2 bouyer ELF32_MACHDEP_ID_CASES; 204 1.1.2.2 bouyer default: 205 1.1.2.2 bouyer DPRINTF((TEXT("not a native architecture. machine = %d\n"), 206 1.1.2.2 bouyer _eh.e_machine)); 207 1.1.2.2 bouyer return FALSE; 208 1.1.2.2 bouyer } 209 1.1.2.2 bouyer 210 1.1.2.2 bouyer /* Check object type */ 211 1.1.2.2 bouyer if (_eh.e_type != ET_EXEC) { 212 1.1.2.2 bouyer DPRINTF((TEXT("not a executable file. type = %d\n"), 213 1.1.2.2 bouyer _eh.e_type)); 214 1.1.2.2 bouyer return FALSE; 215 1.1.2.2 bouyer } 216 1.1.2.2 bouyer 217 1.1.2.2 bouyer if (_eh.e_phoff == 0 || _eh.e_phnum == 0 || _eh.e_phnum > 16 || 218 1.1.2.2 bouyer _eh.e_phentsize != sizeof(Elf_Phdr)) { 219 1.1.2.2 bouyer DPRINTF((TEXT("invalid program header infomation.\n"))); 220 1.1.2.2 bouyer return FALSE; 221 1.1.2.2 bouyer } 222 1.1.2.2 bouyer 223 1.1.2.2 bouyer return TRUE; 224 1.1.2.2 bouyer } 225
Indexes created Tue Sep 23 23:09:58 GMT 2025