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os: print <signal handler called> if unw_is_signal_frame()

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libunwind has a function to query whether the cursor points to a signal frame.
Use this to print

 1: <signal handler called>

like GDB does, rather than printing something less useful such as

 1: /usr/lib/libpthread.so.0 (funlockfile+0x60) [0x7f679838b870]

Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
(cherry picked from commit a73641937a)
This commit is contained in:
Aaron Plattner 2021-05-27 16:58:56 -07:00 • committed by Olivier Fourdan
parent daaa9f0566
commit 891ea8f74d
1 changed files with 8 additions and 3 deletions
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11
os/backtrace.c
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@ -97,9 +97,14 @@ xorg_backtrace(void)
else
filename = "?";
ErrorFSigSafe("%u: %s (%s%s+0x%x) [%p]\n", i++, filename, procname,
ret == -UNW_ENOMEM ? "..." : "", (int)off,
(void *)(uintptr_t)(ip));
if (unw_is_signal_frame(&cursor)) {
ErrorFSigSafe("%u: <signal handler called>\n", i++);
} else {
ErrorFSigSafe("%u: %s (%s%s+0x%x) [%p]\n", i++, filename, procname,
ret == -UNW_ENOMEM ? "..." : "", (int)off,
(void *)(uintptr_t)(ip));
}
ret = unw_step(&cursor);
if (ret < 0)