runtime: fix openbsd build

notetsleep: nosplit stack overflow
        120	assumed on entry to notetsleep
        96	after notetsleep uses 24
        88	on entry to runtime.semasleep
        32	after runtime.semasleep uses 56
        24	on entry to runtime.nanotime
        -8	after runtime.nanotime uses 32

Nanotime seems to be using only 24 bytes of stack space.
Unless I am missing something.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/12041044

diff --git a/src/pkg/runtime/sys_openbsd_amd64.s b/src/pkg/runtime/sys_openbsd_amd64.s
index 3cbf0d9343f420660c33e9ca4474038a1fc4b775..87e557c8bad6508bba3df663dc7ad0f4e0c4ad30 100644 (file)
--- a/src/pkg/runtime/sys_openbsd_amd64.s
+++ b/src/pkg/runtime/sys_openbsd_amd64.s
@@ -164,7 +164,7 @@ TEXT time·now(SB), 7, $32
        MOVL    DX, nsec+8(FP)
        RET
 
-TEXT runtime·nanotime(SB),7,$32
+TEXT runtime·nanotime(SB),7,$24
        MOVQ    $0, DI                  // arg 1 - clock_id
        LEAQ    8(SP), SI               // arg 2 - tp
        MOVL    $232, AX                // sys_clock_gettime