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addr2line.c: Strip pointer authentication

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We need to manually strip pointer authentication bits on M1 mac because
libunwind leaks them out.

Co-Authored-By: NARUSE, Yui <naruse@airemix.jp>
Co-Authored-By: Yuta Saito <kateinoigakukun@gmail.com>
This commit is contained in:
Yusuke Endoh 2022-12-19 17:15:31 +09:00
parent 97280faf28
commit 65920cfc40
Notes: git 2022-12-23 14:48:36 +00:00 
Merged: https://github.com/ruby/ruby/pull/7011
1 changed files with 10 additions and 0 deletions
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addr2line.c
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@ -2548,6 +2548,16 @@ rb_dump_backtrace_with_lines(int num_traces, void **traces)
obj_info_t *obj = NULL;
/* 2 is NULL + main executable */
void **dladdr_fbases = (void **)calloc(num_traces+2, sizeof(void *));
#if defined(__APPLE__) && defined(__aarch64__)
// Strip Arm64's pointer authentication.
for (i = 0; i < num_traces; i++) {
// I wish I could use "ptrauth_strip()" but I get an error:
// "this target does not support pointer authentication"
traces[i] = (void*)(((uint64_t)traces[i]) & 0x7fffffffffffull);
}
#endif
#ifdef HAVE_MAIN_EXE_PATH
char *main_path = NULL; /* used on printing backtrace */
ssize_t len;