From: Benny Siegert <bsiegert@gmail.com>
Date: Thu, 6 Jan 2022 11:27:57 +0000 (+0000)
Subject: runtime: crash on netbsd-arm64 when setcontext fails
X-Git-Tag: go1.18beta2~163
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=f300fc2d2c620feac4e7f9b6cf0125b92943d3c4;p=gostls13.git

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 <tobias.klauser@gmail.com>
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Trust: Benny Siegert <bsiegert@gmail.com>
---

diff --git a/src/runtime/sys_netbsd_arm64.s b/src/runtime/sys_netbsd_arm64.s
index 2d0b894d47..8a0496e807 100644
--- 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