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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 13:16:40 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 13:16:40 +0000
commit47ab3d4a42e9ab51c465c4322d2ec233f6324e6b (patch)
treea61a0ffd83f4a3def4b36e5c8e99630c559aa723 /src/runtime/internal/atomic/sys_nonlinux_arm.s
parentInitial commit. (diff)
downloadgolang-1.18-47ab3d4a42e9ab51c465c4322d2ec233f6324e6b.tar.xz
golang-1.18-47ab3d4a42e9ab51c465c4322d2ec233f6324e6b.zip
Adding upstream version 1.18.10.upstream/1.18.10upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/runtime/internal/atomic/sys_nonlinux_arm.s')
-rw-r--r--src/runtime/internal/atomic/sys_nonlinux_arm.s79
1 files changed, 79 insertions, 0 deletions
diff --git a/src/runtime/internal/atomic/sys_nonlinux_arm.s b/src/runtime/internal/atomic/sys_nonlinux_arm.s
new file mode 100644
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--- /dev/null
+++ b/src/runtime/internal/atomic/sys_nonlinux_arm.s
@@ -0,0 +1,79 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !linux
+
+#include "textflag.h"
+
+// TODO(minux): this is only valid for ARMv6+
+// bool armcas(int32 *val, int32 old, int32 new)
+// Atomically:
+// if(*val == old){
+// *val = new;
+// return 1;
+// }else
+// return 0;
+TEXT ·Cas(SB),NOSPLIT,$0
+ JMP ·armcas(SB)
+
+// Non-linux OSes support only single processor machines before ARMv7.
+// So we don't need memory barriers if goarm < 7. And we fail loud at
+// startup (runtime.checkgoarm) if it is a multi-processor but goarm < 7.
+
+TEXT ·Load(SB),NOSPLIT|NOFRAME,$0-8
+ MOVW addr+0(FP), R0
+ MOVW (R0), R1
+
+ MOVB runtime·goarm(SB), R11
+ CMP $7, R11
+ BLT 2(PC)
+ DMB MB_ISH
+
+ MOVW R1, ret+4(FP)
+ RET
+
+TEXT ·Store(SB),NOSPLIT,$0-8
+ MOVW addr+0(FP), R1
+ MOVW v+4(FP), R2
+
+ MOVB runtime·goarm(SB), R8
+ CMP $7, R8
+ BLT 2(PC)
+ DMB MB_ISH
+
+ MOVW R2, (R1)
+
+ CMP $7, R8
+ BLT 2(PC)
+ DMB MB_ISH
+ RET
+
+TEXT ·Load8(SB),NOSPLIT|NOFRAME,$0-5
+ MOVW addr+0(FP), R0
+ MOVB (R0), R1
+
+ MOVB runtime·goarm(SB), R11
+ CMP $7, R11
+ BLT 2(PC)
+ DMB MB_ISH
+
+ MOVB R1, ret+4(FP)
+ RET
+
+TEXT ·Store8(SB),NOSPLIT,$0-5
+ MOVW addr+0(FP), R1
+ MOVB v+4(FP), R2
+
+ MOVB runtime·goarm(SB), R8
+ CMP $7, R8
+ BLT 2(PC)
+ DMB MB_ISH
+
+ MOVB R2, (R1)
+
+ CMP $7, R8
+ BLT 2(PC)
+ DMB MB_ISH
+ RET
+