Merge "Allow multiple threads sharing a map to unwind."
diff --git a/libunwindstack/tools/unwind_info.cpp b/libunwindstack/tools/unwind_info.cpp
index 77f3bb2..a00b2ee 100644
--- a/libunwindstack/tools/unwind_info.cpp
+++ b/libunwindstack/tools/unwind_info.cpp
@@ -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 @@
}
}
-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 @@
} // 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 @@
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);
}