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Add way to specify an offset in an elf file.

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This is to support the ability to dump an elf embedded in an apk.

Test: Ran unwind_info on a file, then ran it on an apk with an offset.
Change-Id: I8f23f4bdaadfd3665900bdd45d50cb270e2e0eed
This commit is contained in:
Christopher Ferris 2017-11-28 10:59:33 -08:00
parent 8055ea44de
commit a141709b21
1 changed files with 20 additions and 5 deletions
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25
libunwindstack/tools/unwind_info.cpp
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@ -19,6 +19,7 @@
#include <fcntl.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
@ -102,12 +103,12 @@ void DumpDwarfSection(ElfInterface* interface, DwarfSection* section, uint64_t l
}
}
int GetElfInfo(const char* file) {
int GetElfInfo(const char* file, uint64_t offset) {
// Send all log messages to stdout.
log_to_stdout(true);
MemoryFileAtOffset* memory = new MemoryFileAtOffset;
if (!memory->Init(file, 0)) {
if (!memory->Init(file, offset)) {
// Initializatation failed.
printf("Failed to init\n");
return 1;
@ -164,8 +165,12 @@ int GetElfInfo(const char* file) {
} // namespace unwindstack
int main(int argc, char** argv) {
if (argc != 2) {
printf("Need to pass the name of an elf file to the program.\n");
if (argc != 2 && argc != 3) {
printf("Usage: unwind_info ELF_FILE [OFFSET]\n");
printf(" ELF_FILE\n");
printf(" The path to an elf file.\n");
printf(" OFFSET\n");
printf(" Use the offset into the ELF file as the beginning of the elf.\n");
return 1;
}
@ -179,5 +184,15 @@ int main(int argc, char** argv) {
return 1;
}
return unwindstack::GetElfInfo(argv[1]);
uint64_t offset = 0;
if (argc == 3) {
char* end;
offset = strtoull(argv[2], &end, 16);
if (*end != '\0') {
printf("Malformed OFFSET value: %s\n", argv[2]);
return 1;
}
}
return unwindstack::GetElfInfo(argv[1], offset);
}