54782bfb30
use /m5/system/linux for their binaries
base/loader/elf_object.cc:
Elf loader now conforms to coding style
--HG--
extra : convert_revision : 558e587e969535f31987f2810ee17ec72006de0a
331 lines
9.2 KiB
C++
331 lines
9.2 KiB
C++
/*
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* Copyright (c) 2003 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <string>
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#include "base/loader/elf_object.hh"
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#include "mem/functional_mem/functional_memory.hh"
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#include "base/loader/symtab.hh"
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#include "base/trace.hh" // for DPRINTF
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using namespace std;
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ObjectFile *
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ElfObject::tryFile(const string &fname, int fd, size_t len, uint8_t *data)
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{
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Elf *elf;
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GElf_Ehdr ehdr;
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/* check that header matches library version */
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assert(elf_version(EV_CURRENT) != EV_NONE);
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/* get a pointer to elf structure */
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elf = elf_memory((char*)data,len);
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/* will only fail if fd is invalid */
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assert(elf != NULL);
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/* Check that we actually have a elf file */
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if(gelf_getehdr(elf, &ehdr) ==0)
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{
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DPRINTFR(Loader, "Not ELF\n");
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elf_end(elf);
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return NULL;
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}
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else
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{
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if (ehdr.e_ident[EI_CLASS] == ELFCLASS32)
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panic("32 bit ELF Binary, Not Supported");
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if (ehdr.e_machine != EM_ALPHA)
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panic("Non Alpha Binary, Not Supported");
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elf_end(elf);
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return new ElfObject(fname, fd, len, data,
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ObjectFile::Alpha, ObjectFile::Linux);
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}
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}
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ElfObject::ElfObject(const string &_filename, int _fd,
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size_t _len, uint8_t *_data,
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Arch _arch, OpSys _opSys)
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: ObjectFile(_filename, _fd, _len, _data, _arch, _opSys)
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{
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Elf *elf;
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GElf_Ehdr ehdr;
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/* check that header matches library version */
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assert(elf_version(EV_CURRENT) != EV_NONE);
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/* get a pointer to elf structure */
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elf = elf_memory((char*)fileData,len);
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/* will only fail if fd is invalid */
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assert(elf != NULL);
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/* Check that we actually have a elf file */
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if(gelf_getehdr(elf, &ehdr) ==0)
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{
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panic("Not ELF, shouldn't be here");
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}
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entry = ehdr.e_entry;
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elf_end(elf);
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/* We will actually read the sections when we need to load them*/
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}
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bool
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ElfObject::loadSections(FunctionalMemory *mem, bool loadPhys)
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{
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Elf *elf;
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int sec_idx = 1; /* there is a 0 but it is nothing, go figure*/
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Elf_Scn *section;
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GElf_Shdr shdr;
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GElf_Ehdr ehdr;
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uint8_t *zero_mem;
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uint8_t *section_data;
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Addr address;
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char *sec_name;
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/* check that header matches library version */
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assert(elf_version(EV_CURRENT) != EV_NONE);
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/* get a pointer to elf structure */
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elf = elf_memory((char*)fileData,len);
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assert(elf != NULL);
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/* Check that we actually have a elf file */
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if(gelf_getehdr(elf, &ehdr) ==0)
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{
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panic("Not ELF, shouldn't be here");
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}
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/* Get the first section */
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section = elf_getscn(elf, sec_idx);
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/* While there are no more sections */
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while (section != NULL)
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{
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gelf_getshdr(section, &shdr);
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if (shdr.sh_flags & SHF_ALLOC)
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{
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/* we should load this */
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DPRINTF(Loader,"Name: %20s Address: 0x%016llx Size: 0x%08llx Offset: 0x%08llx Flags:0x%08llx %s\n",
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elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name), shdr.sh_addr,
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shdr.sh_size, shdr.sh_offset, shdr.sh_flags, shdr.sh_flags & SHF_ALLOC ? "ALLOC" : "");
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sec_name = elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name);
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section_data = fileData + shdr.sh_offset;
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if(sec_name)
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{
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if (strcmp(sec_name, ".text")==0)
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{
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text.baseAddr = shdr.sh_addr;
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text.size = shdr.sh_size;
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}
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if (strcmp(sec_name, ".data")==0)
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{
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data.baseAddr = shdr.sh_addr;
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data.size = shdr.sh_size;
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}
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if (strcmp(sec_name, ".bss")==0)
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{
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bss.baseAddr = shdr.sh_addr;
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bss.size = shdr.sh_size;
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/* If this is the .bss section it must be 0, so just
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to be extra causious, lets allocate some memory
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bzero it, and write that */
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zero_mem = (uint8_t*)malloc(shdr.sh_size);
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memset(zero_mem, 0, shdr.sh_size);
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section_data = zero_mem;
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}
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}
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if(shdr.sh_size != 0)
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{
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if (loadPhys)
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{
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address = shdr.sh_addr &= (ULL(1) << 40) - 1;
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mem->prot_write(address, section_data, shdr.sh_size);
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}
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else
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{
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mem->prot_write(shdr.sh_addr, section_data, shdr.sh_size);
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}
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}
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}
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++sec_idx;
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section = elf_getscn(elf, sec_idx);
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}
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free(zero_mem);
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elf_end(elf);
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return true;
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}
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bool
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ElfObject::loadGlobalSymbols(SymbolTable *symtab)
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{
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Elf *elf;
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int sec_idx = 1; /* there is a 0 but it is nothing, go figure*/
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Elf_Scn *section;
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GElf_Shdr shdr;
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Elf_Data *data;
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int count, ii;
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bool found = false;
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GElf_Sym sym;
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if (!symtab)
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return false;
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/* check that header matches library version */
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assert(elf_version(EV_CURRENT) != EV_NONE);
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/* get a pointer to elf structure */
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elf = elf_memory((char*)fileData,len);
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assert(elf != NULL);
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/* Get the first section */
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section = elf_getscn(elf, sec_idx);
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/* While there are no more sections */
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while (section != NULL)
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{
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gelf_getshdr(section, &shdr);
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if(shdr.sh_type == SHT_SYMTAB)
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{
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found = true;
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data = elf_getdata(section, NULL);
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count = shdr.sh_size / shdr.sh_entsize;
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DPRINTF(Loader, "Found Symbol Table, %d symbols present\n", count);
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/* loop through all the symbols, only loading global ones*/
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for (ii = 0; ii < count; ++ii)
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{
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gelf_getsym(data, ii, &sym);
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if ((GELF_ST_BIND(sym.st_info) & STB_GLOBAL) &&
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((GELF_ST_TYPE(sym.st_info) == STT_FUNC) || (GELF_ST_TYPE(sym.st_info) == STT_NOTYPE)))
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{
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symtab->insert(sym.st_value, elf_strptr(elf, shdr.sh_link, sym.st_name));
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}
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}
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}
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++sec_idx;
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section = elf_getscn(elf, sec_idx);
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}
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elf_end(elf);
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return found;
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}
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bool
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ElfObject::loadLocalSymbols(SymbolTable *symtab)
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{
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Elf *elf;
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int sec_idx = 1; /* there is a 0 but it is nothing, go figure*/
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Elf_Scn *section;
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GElf_Shdr shdr;
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Elf_Data *data;
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int count, ii;
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bool found = false;
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GElf_Sym sym;
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if (!symtab)
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return false;
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/* check that header matches library version */
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assert(elf_version(EV_CURRENT) != EV_NONE);
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/* get a pointer to elf structure */
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elf = elf_memory((char*)fileData,len);
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assert(elf != NULL);
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/* Get the first section */
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section = elf_getscn(elf, sec_idx);
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/* While there are no more sections */
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while (section != NULL)
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{
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gelf_getshdr(section, &shdr);
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if(shdr.sh_type == SHT_SYMTAB)
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{
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found = true;
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data = elf_getdata(section, NULL);
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count = shdr.sh_size / shdr.sh_entsize;
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DPRINTF(Loader, "Found Symbol Table, %d symbols present\n", count);
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/* loop through all the symbols, only loading global ones*/
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for (ii = 0; ii < count; ++ii)
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{
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gelf_getsym(data, ii, &sym);
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if (GELF_ST_BIND(sym.st_info) & STB_LOCAL)
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{
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symtab->insert(sym.st_value, elf_strptr(elf, shdr.sh_link, sym.st_name));
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}
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}
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}
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++sec_idx;
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section = elf_getscn(elf, sec_idx);
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}
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elf_end(elf);
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return found;
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}
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