// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
-// Tool to pack and unpack R_ARM_RELATIVE relocations in a shared library.
+// Tool to pack and unpack relative relocations in a shared library.
//
-// Packing removes R_ARM_RELATIVE relocations from .rel.dyn and writes them
+// Packing removes relative relocations from .rel.dyn and writes them
// in a more compact form to .android.rel.dyn. Unpacking does the reverse.
//
// Invoke with -v to trace actions taken when packing or unpacking.
-// Invoke with -p to pad removed relocations with R_ARM_NONE. Suppresses
+// Invoke with -p to pad removed relocations with R_*_NONE. Suppresses
// shrinking of .rel.dyn.
// See PrintUsage() below for full usage details.
//
// NOTE: Breaks with libelf 0.152, which is buggy. libelf 0.158 works.
-// TODO(simonb): Extend for 64-bit target libraries.
-
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
-#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <string>
#include "debug.h"
#include "elf_file.h"
#include "libelf.h"
-#include "packer.h"
+
+namespace {
void PrintUsage(const char* argv0) {
std::string temporary = argv0;
const char* basename = temporary.c_str();
printf(
- "Usage: %s [-u] [-v] [-p] file\n"
- "Pack or unpack R_ARM_RELATIVE relocations in a shared library.\n\n"
- " -u, --unpack unpack previously packed R_ARM_RELATIVE relocations\n"
+ "Usage: %s [-u] [-v] [-p] file\n\n"
+ "Pack or unpack relative relocations in a shared library.\n\n"
+ " -u, --unpack unpack previously packed relative relocations\n"
" -v, --verbose trace object file modifications (for debugging)\n"
- " -p, --pad do not shrink .rel.dyn, but pad (for debugging)\n\n"
- "Extracts R_ARM_RELATIVE relocations from the .rel.dyn section, packs\n"
- "them into a more compact format, and stores the packed relocations in\n"
- ".android.rel.dyn. Expands .android.rel.dyn to hold the packed data,\n"
- "and shrinks .rel.dyn by the amount of unpacked data removed from it.\n\n"
- "Before being packed, a shared library needs to be prepared by adding\n"
- "a null .android.rel.dyn section. A complete packing process is:\n\n"
- " echo -n 'NULL' >/tmp/small\n"
- " arm-linux-gnueabi-objcopy \\\n"
- " --add-section .android.rel.dyn=/tmp/small \\\n"
- " libchrome.<version>.so\n"
- " rm /tmp/small\n"
- " %s libchrome.<version>.so\n\n"
- "To unpack and restore the shared library to its original state:\n\n"
- " %s -u libchrome.<version>.so\n"
- " arm-linux-gnueabi-objcopy \\\n"
- " --remove-section=.android.rel.dyn libchrome.<version>.so\n\n"
+ " -p, --pad do not shrink relocations, but pad (for debugging)\n\n",
+ basename);
+
+ if (ELF::kMachine == EM_ARM) {
+ printf(
+ "Extracts relative relocations from the .rel.dyn section, packs them\n"
+ "into a more compact format, and stores the packed relocations in\n"
+ ".android.rel.dyn. Expands .android.rel.dyn to hold the packed\n"
+ "data, and shrinks .rel.dyn by the amount of unpacked data removed\n"
+ "from it.\n\n"
+ "Before being packed, a shared library needs to be prepared by adding\n"
+ "a null .android.rel.dyn section.\n\n"
+ "To pack relocations in a shared library:\n\n"
+ " echo -n 'NULL' >/tmp/small\n"
+ " arm-linux-androideabi-objcopy \\\n"
+ " --add-section .android.rel.dyn=/tmp/small \\\n"
+ " libchrome.<version>.so\n"
+ " rm /tmp/small\n"
+ " %s libchrome.<version>.so\n\n"
+ "To unpack and restore the shared library to its original state:\n\n"
+ " %s -u libchrome.<version>.so\n"
+ " arm-linux-androideabi-objcopy \\\n"
+ " --remove-section=.android.rel.dyn libchrome.<version>.so\n\n",
+ basename, basename);
+ } else if (ELF::kMachine == EM_AARCH64) {
+ printf(
+ "Extracts relative relocations from the .rela.dyn section, packs them\n"
+ "into a more compact format, and stores the packed relocations in\n"
+ ".android.rela.dyn. Expands .android.rela.dyn to hold the packed\n"
+ "data, and shrinks .rela.dyn by the amount of unpacked data removed\n"
+ "from it.\n\n"
+ "Before being packed, a shared library needs to be prepared by adding\n"
+ "a null .android.rela.dyn section.\n\n"
+ "To pack relocations in a shared library:\n\n"
+ " echo -n 'NULL' >/tmp/small\n"
+ " aarch64-linux-android-objcopy \\\n"
+ " --add-section .android.rela.dyn=/tmp/small \\\n"
+ " libchrome.<version>.so\n"
+ " rm /tmp/small\n"
+ " %s libchrome.<version>.so\n\n"
+ "To unpack and restore the shared library to its original state:\n\n"
+ " %s -u libchrome.<version>.so\n"
+ " aarch64-linux-android-objcopy \\\n"
+ " --remove-section=.android.rela.dyn libchrome.<version>.so\n\n",
+ basename, basename);
+ } else {
+ NOTREACHED();
+ }
+
+ printf(
"Debug sections are not handled, so packing should not be used on\n"
- "shared libraries compiled for debugging or otherwise unstripped.\n",
- basename, basename, basename);
+ "shared libraries compiled for debugging or otherwise unstripped.\n");
}
+} // namespace
+
int main(int argc, char* argv[]) {
bool is_unpacking = false;
bool is_verbose = false;
PrintUsage(argv[0]);
return 0;
case '?':
- LOG("Try '%s --help' for more information.\n", argv[0]);
+ LOG(INFO) << "Try '" << argv[0] << " --help' for more information.";
return 1;
case -1:
has_options = false;
break;
default:
NOTREACHED();
+ return 1;
}
}
if (optind != argc - 1) {
- LOG("Try '%s --help' for more information.\n", argv[0]);
+ LOG(INFO) << "Try '" << argv[0] << " --help' for more information.";
return 1;
}
if (elf_version(EV_CURRENT) == EV_NONE) {
- LOG("WARNING: Elf Library is out of date!\n");
+ LOG(WARNING) << "Elf Library is out of date!";
}
+ LOG(INFO) << "Configured for " << ELF::Machine();
+
const char* file = argv[argc - 1];
const int fd = open(file, O_RDWR);
if (fd == -1) {
- LOG("%s: %s\n", file, strerror(errno));
+ LOG(ERROR) << file << ": " << strerror(errno);
return 1;
}
- relocation_packer::Logger::SetVerbose(is_verbose);
+ if (is_verbose)
+ relocation_packer::Logger::SetVerbose(1);
relocation_packer::ElfFile elf_file(fd);
elf_file.SetPadding(is_padding);
close(fd);
if (!status) {
- LOG("ERROR: %s: failed to pack/unpack file\n", file);
+ LOG(ERROR) << file << ": failed to pack/unpack file";
return 1;
}
projects / platform / framework / web / crosswalk.git / blobdiff