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/*
* Copyright (c) 2002-2004 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.
*
* Authors: Nathan Binkert
* Steve Reinhardt
*/
#include "base/loader/object_file.hh"
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <unistd.h>
#include <zlib.h>
#include <cstdio>
#include <list>
#include <string>
#include <vector>
#include "base/cprintf.hh"
#include "base/loader/aout_object.hh"
#include "base/loader/dtb_object.hh"
#include "base/loader/ecoff_object.hh"
#include "base/loader/elf_object.hh"
#include "base/loader/raw_object.hh"
#include "base/loader/symtab.hh"
#include "mem/port_proxy.hh"
using namespace std;
ObjectFile::ObjectFile(const string &_filename,
size_t _len, uint8_t *_data,
Arch _arch, OpSys _op_sys)
: filename(_filename), fileData(_data), len(_len),
arch(_arch), opSys(_op_sys), entry(0), globalPtr(0),
text{0, nullptr, 0}, data{0, nullptr, 0}, bss{0, nullptr, 0}
{
}
ObjectFile::~ObjectFile()
{
if (fileData) {
::munmap((char*)fileData, len);
fileData = NULL;
}
}
bool
ObjectFile::loadSection(Section *sec, const PortProxy& mem_proxy,
Addr addr_mask, Addr offset)
{
if (sec->size != 0) {
Addr addr = (sec->baseAddr & addr_mask) + offset;
if (sec->fileImage) {
mem_proxy.writeBlob(addr, sec->fileImage, sec->size);
}
else {
// no image: must be bss
mem_proxy.memsetBlob(addr, 0, sec->size);
}
}
return true;
}
bool
ObjectFile::loadSections(const PortProxy& mem_proxy, Addr addr_mask,
Addr offset)
{
return (loadSection(&text, mem_proxy, addr_mask, offset)
&& loadSection(&data, mem_proxy, addr_mask, offset)
&& loadSection(&bss, mem_proxy, addr_mask, offset));
}
namespace
{
typedef std::vector<ObjectFile::Loader *> LoaderList;
LoaderList &
object_file_loaders()
{
static LoaderList loaders;
return loaders;
}
} // anonymous namespace
ObjectFile::Loader::Loader()
{
object_file_loaders().emplace_back(this);
}
Process *
ObjectFile::tryLoaders(ProcessParams *params, ObjectFile *obj_file)
{
for (auto &loader: object_file_loaders()) {
Process *p = loader->load(params, obj_file);
if (p)
return p;
}
return nullptr;
}
static bool
hasGzipMagic(int fd)
{
uint8_t buf[2] = {0};
size_t sz = pread(fd, buf, 2, 0);
panic_if(sz != 2, "Couldn't read magic bytes from object file");
return ((buf[0] == 0x1f) && (buf[1] == 0x8b));
}
static int
doGzipLoad(int fd)
{
const size_t blk_sz = 4096;
gzFile fdz = gzdopen(fd, "rb");
if (!fdz) {
return -1;
}
size_t tmp_len = strlen(P_tmpdir);
char *tmpnam = (char*) malloc(tmp_len + 20);
strcpy(tmpnam, P_tmpdir);
strcpy(tmpnam+tmp_len, "/gem5-gz-obj-XXXXXX"); // 19 chars
fd = mkstemp(tmpnam); // repurposing fd variable for output
if (fd < 0) {
free(tmpnam);
gzclose(fdz);
return fd;
}
if (unlink(tmpnam) != 0)
warn("couldn't remove temporary file %s\n", tmpnam);
free(tmpnam);
auto buf = new uint8_t[blk_sz];
int r; // size of (r)emaining uncopied data in (buf)fer
while ((r = gzread(fdz, buf, blk_sz)) > 0) {
auto p = buf; // pointer into buffer
while (r > 0) {
auto sz = write(fd, p, r);
assert(sz <= r);
r -= sz;
p += sz;
}
}
delete[] buf;
gzclose(fdz);
if (r < 0) { // error
close(fd);
return -1;
}
assert(r == 0); // finished successfully
return fd; // return fd to decompressed temporary file for mmap()'ing
}
ObjectFile *
createObjectFile(const string &fname, bool raw)
{
// open the file
int fd = open(fname.c_str(), O_RDONLY);
if (fd < 0) {
return NULL;
}
// decompress GZ files
if (hasGzipMagic(fd)) {
fd = doGzipLoad(fd);
if (fd < 0) {
return NULL;
}
}
// find the length of the file by seeking to the end
off_t off = lseek(fd, 0, SEEK_END);
fatal_if(off < 0,
"Failed to determine size of object file %s\n", fname);
auto len = static_cast<size_t>(off);
// mmap the whole shebang
uint8_t *file_data = (uint8_t *)mmap(NULL, len, PROT_READ, MAP_SHARED,
fd, 0);
close(fd);
if (file_data == MAP_FAILED) {
return NULL;
}
ObjectFile *file_obj = NULL;
// figure out what we have here
if ((file_obj = ElfObject::tryFile(fname, len, file_data)) != NULL) {
return file_obj;
}
if ((file_obj = EcoffObject::tryFile(fname, len, file_data)) != NULL) {
return file_obj;
}
if ((file_obj = AoutObject::tryFile(fname, len, file_data)) != NULL) {
return file_obj;
}
if ((file_obj = DtbObject::tryFile(fname, len, file_data)) != NULL) {
return file_obj;
}
if (raw)
return RawObject::tryFile(fname, len, file_data);
// don't know what it is
munmap((char*)file_data, len);
return NULL;
}