runtime: correct assembly for openbsd/arm64

Correct the pipe and pipe2 implementations by using the correct RSP offsets,
used to store and return the file descriptor array.

Fix setNonblock by using the correct immediate value for O_NONBLOCK and
replace EOR (exclusive OR) with ORR.

Also correct the write1 implementation, which has a uintptr value for the fd
argument.

Change-Id: Ibca77af44b649e8bb330ca54f9c36a7a8b0f9cea
Reviewed-on: https://go-review.googlesource.com/c/go/+/212765
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

diff --git a/src/runtime/sys_openbsd_arm64.s b/src/runtime/sys_openbsd_arm64.s
index 8e1a5bc5424a30c472b39a31bd2848c93bbace6d..839aa5706275bc5b2fbf1700319df13ff6e8e8c2 100644 (file)
--- a/src/runtime/sys_openbsd_arm64.s
+++ b/src/runtime/sys_openbsd_arm64.s
@@ -65,7 +65,7 @@ TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0
 
 // func pipe() (r, w int32, errno int32)
 TEXT runtime·pipe(SB),NOSPLIT|NOFRAME,$0-12
-       MOVD    RSP, R0
+       MOVD    $r+0(FP), R0
        MOVW    $0, R1
        MOVD    $101, R8                // sys_pipe2
        SVC
@@ -76,7 +76,7 @@ TEXT runtime·pipe(SB),NOSPLIT|NOFRAME,$0-12
 
 // func pipe2(flags int32) (r, w int32, errno int32)
 TEXT runtime·pipe2(SB),NOSPLIT|NOFRAME,$0-20
-       ADD     $8, RSP, R0
+       MOVD    $r+8(FP), R0
        MOVW    flags+0(FP), R1
        MOVD    $101, R8                // sys_pipe2
        SVC
@@ -86,7 +86,7 @@ TEXT runtime·pipe2(SB),NOSPLIT|NOFRAME,$0-20
        RET
 
 TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0
-       MOVW    fd+0(FP), R0            // arg 1 - fd
+       MOVD    fd+0(FP), R0            // arg 1 - fd
        MOVD    p+8(FP), R1             // arg 2 - buf
        MOVW    n+16(FP), R2            // arg 3 - nbyte
        MOVD    $4, R8                  // sys_write
@@ -428,8 +428,8 @@ TEXT runtime·setNonblock(SB),NOSPLIT|NOFRAME,$0-4
        MOVD    $0, R2                  // arg 3
        MOVD    $92, R8                 // sys_fcntl
        SVC
-       MOVD    $0x800, R2              // O_NONBLOCK
-       EOR     R0, R2                  // arg 3 - flags
+       MOVD    $4, R2                  // O_NONBLOCK
+       ORR     R0, R2                  // arg 3 - flags
        MOVW    fd+0(FP), R0            // arg 1 - fd
        MOVD    $4, R1                  // arg 2 - cmd (F_SETFL)
        MOVD    $92, R8                 // sys_fcntl