runtime: use correct MOV for plan9 brk_ ret value

Updates #11041

Change-Id: I78f8d48f00cfbb451e37c868cc472ef06ea0fd95
Reviewed-on: https://go-review.googlesource.com/27491
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/src/runtime/sys_plan9_amd64.s b/src/runtime/sys_plan9_amd64.s
index 1492ef2fed6059407102f08bf4bd1c2b2509e8a8..c18aecaa26de8341c42afbe17250f4eaf91d6be8 100644 (file)
--- a/src/runtime/sys_plan9_amd64.s
+++ b/src/runtime/sys_plan9_amd64.s
@@ -65,7 +65,7 @@ TEXT runtime·exits(SB),NOSPLIT,$0
 TEXT runtime·brk_(SB),NOSPLIT,$0
        MOVQ    $24, BP
        SYSCALL
-       MOVQ    AX, ret+8(FP)
+       MOVL    AX, ret+8(FP)
        RET
 
 TEXT runtime·sleep(SB),NOSPLIT,$0