diff options
Diffstat (limited to 'base/loader/elf_object.cc')
-rw-r--r-- | base/loader/elf_object.cc | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/base/loader/elf_object.cc b/base/loader/elf_object.cc new file mode 100644 index 000000000..97f50e289 --- /dev/null +++ b/base/loader/elf_object.cc @@ -0,0 +1,140 @@ +/* + * Copyright (c) 2003 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <string> + +#include "elf_object.hh" + +#include "functional_memory.hh" +#include "symtab.hh" + +#include "trace.hh" // for DPRINTF + +#include "exec_elf.h" + +using namespace std; + +ObjectFile * +ElfObject::tryFile(const string &fname, int fd, size_t len, uint8_t *data) +{ + if (memcmp(((Elf64_Ehdr *)data)->e_ident, ELFMAG, SELFMAG) == 0) { + // for now we'll assume it's a 64-bit Alpha binary + return new ElfObject(fname, fd, len, data); + } + else { + return NULL; + } +} + + +ElfObject::ElfObject(const string &_filename, int _fd, + size_t _len, uint8_t *_data) + : ObjectFile(_filename, _fd, _len, _data) +{ + ehdr = (Elf64_Ehdr *)fileData; + + entry = ehdr->e_entry; + + phdr = (Elf64_Phdr *)(fileData + ehdr->e_phoff); + assert(sizeof(Elf64_Phdr) == ehdr->e_phentsize); + + bool foundText = false; + bool foundData = false; + for (int i = 0; i < ehdr->e_phnum; ++i) { + Elf64_Phdr *p = &phdr[i]; + + // for now we don't care about non-loadable segments + if (!(p->p_type & PT_LOAD)) + continue; + + if (p->p_flags & PF_X) { + // executable: must be text + assert(!foundText); + foundText = true; + textPhdrIdx = i; + text.baseAddr = p->p_vaddr; + text.size = p->p_filesz; + assert(p->p_filesz == p->p_memsz); + } + else { + assert(p->p_flags & PF_R); + assert(!foundData); + foundData = true; + dataPhdrIdx = i; + data.baseAddr = p->p_vaddr; + data.size = p->p_filesz; + bss.baseAddr = data.baseAddr + data.size; + bss.size = p->p_memsz - p->p_filesz; + } + } + + assert(foundText && foundData); + + DPRINTFR(Loader, "text: 0x%x %d\ndata: 0x%x %d\nbss: 0x%x %d\n", + text.baseAddr, text.size, data.baseAddr, data.size, + bss.baseAddr, bss.size); +} + + +bool +ElfObject::loadSections(FunctionalMemory *mem, bool loadPhys) +{ + Addr textAddr = text.baseAddr; + Addr dataAddr = data.baseAddr; + + if (loadPhys) { + textAddr &= (ULL(1) << 40) - 1; + dataAddr &= (ULL(1) << 40) - 1; + } + + // Since we don't really have an MMU and all memory is + // zero-filled, there's no need to set up the BSS segment. + if (text.size != 0) + mem->prot_write(textAddr, fileData + phdr[textPhdrIdx].p_offset, + text.size); + if (data.size != 0) + mem->prot_write(dataAddr, fileData + phdr[dataPhdrIdx].p_offset, + data.size); + + return true; +} + + +bool +ElfObject::loadGlobalSymbols(SymbolTable *symtab) +{ + // symbols not supported yet + return false; +} + +bool +ElfObject::loadLocalSymbols(SymbolTable *symtab) +{ + // symbols not supported yet + return false; +} |