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Diffstat (limited to 'src/base/loader/image_file_data.cc')
-rw-r--r-- | src/base/loader/image_file_data.cc | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/src/base/loader/image_file_data.cc b/src/base/loader/image_file_data.cc new file mode 100644 index 000000000..12cba77e0 --- /dev/null +++ b/src/base/loader/image_file_data.cc @@ -0,0 +1,130 @@ +/* + * 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/image_file_data.hh" + +#include <fcntl.h> +#include <sys/mman.h> +#include <sys/types.h> +#include <unistd.h> +#include <zlib.h> + +#include <cstdio> +#include <vector> + +#include "base/logging.hh" + +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 +} + +ImageFileData::ImageFileData(const std::string &fname) +{ + _filename = fname; + + // Open the file. + int fd = open(fname.c_str(), O_RDONLY); + panic_if(fd < 0, "Failed to open file %s.\n", fname); + + // Decompress GZ files. + if (hasGzipMagic(fd)) { + fd = doGzipLoad(fd); + panic_if(fd < 0, "Failed to unzip file %s.\n", fname); + } + + // 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 file %s.\n", fname); + _len = static_cast<size_t>(off); + + // Mmap the whole shebang. + _data = (uint8_t *)mmap(NULL, _len, PROT_READ, MAP_SHARED, fd, 0); + close(fd); + + panic_if(_data == MAP_FAILED, "Failed to mmap file %s.\n", fname); +} + +ImageFileData::~ImageFileData() +{ + munmap((void *)_data, _len); +} |