runtime: crash on netbsd-arm64 when setcontext fails

Instead of exiting with status 16962 when we fail to call SYS_setcontext in sigreturn, reference a null pointer and crash. Hopefully, this will enable grabbing a core dump to debug. Updates #42422 Change-Id: If02c14a0a37084351f3f00db3dc9766cb68ae4b8 Reviewed-on: https://go-review.googlesource.com/c/go/+/375834 Reviewed-by: Tobias Klauser <[email protected]> Trust: Tobias Klauser <[email protected]> Trust: Benny Siegert <[email protected]>
golang · Jan 6, 2022 · f300fc2 · f300fc2
1 parent b5bfaf4
commit f300fc2
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/runtime/sys_netbsd_arm64.s b/src/runtime/sys_netbsd_arm64.s
@@ -279,8 +279,8 @@ fail:
 TEXT sigreturn_tramp<>(SB),NOSPLIT,$-8
 	MOVD	g, R0
 	SVC	$SYS_setcontext
-	MOVD	$0x4242, R0		// Something failed, return magic number
-	SVC	$SYS_exit
+	MOVD	$0, R0
+	MOVD	R0, (R0)		// crash
 
 TEXT runtime·sigaction(SB),NOSPLIT,$-8
 	MOVW	sig+0(FP), R0		// arg 1 - signum