From: Dave Cheney <dave@cheney.net>
Date: Tue, 23 Sep 2014 05:34:38 +0000 (+1000)
Subject: runtime: fix runtime.Breakpoint on ARMv5
X-Git-Tag: go1.4beta1~322
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=c486d4130d01f1034901d65c764b8e8ae329a01b;p=gostls13.git

runtime: fix runtime.Breakpoint on ARMv5

Fixes #8775.

Use the illegal instruction suggested by Ian in https://golang.org/cl/144180043/#msg4 on all arm arches.

LGTM=minux
R=golang-codereviews, gobot, rsc
CC=golang-codereviews, iant, minux
https://golang.org/cl/146130043
---

diff --git a/src/runtime/asm_arm.s b/src/runtime/asm_arm.s
index f67f94939b..38d97b78f3 100644
--- a/src/runtime/asm_arm.s
+++ b/src/runtime/asm_arm.s
@@ -96,7 +96,7 @@ TEXT runtime·breakpoint(SB),NOSPLIT,$0-0
 #ifdef GOOS_nacl
 	WORD	$0xe125be7f	// BKPT 0x5bef, NACL_INSTR_ARM_BREAKPOINT
 #else
-	WORD	$0xe1200071	// BKPT 0x0001
+	WORD	$0xe7f001f0	// undefined instruction that gdb understands is a software breakpoint
 #endif
 	RET