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arch/armv7-r/gcc/arm_atomic.S

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+/*
+ * arm_atomic.s
+ *
+ * Copyright (c) 2020 Semidrive Semiconductor.
+ * All rights reserved.
+ *
+ * Description: ARM atomic function.
+ *
+ * Revision History:
+ * -----------------
+ */
+
+#include <config.h>
+#include <compiler.h>
+
+.text
+
+FUNCTION(arch_atomic_swap)
+.Lloop_atomic_swap:
+    ldrex   r12, [r0]
+    strex   r2, r1, [r0]
+    cmp     r2, #0
+    bne     .Lloop_atomic_swap
+    mov     r0, r12
+    bx      lr
+
+.arm
+
+FUNCTION(arch_atomic_add)
+.Lloop_atomic_add:
+    ldrex   r12, [r0]
+    add     r2, r12, r1
+    strex   r3, r2, [r0]
+    cmp     r3, #0
+    bne     .Lloop_atomic_add
+    mov     r0, r12
+    bx      lr
+
+FUNCTION(arch_atomic_and)
+.Lloop_atomic_and:
+    ldrex   r12, [r0]
+    and     r2, r12, r1
+    strex   r3, r2, [r0]
+    cmp     r3, #0
+    bne     .Lloop_atomic_and
+    mov     r0, r12
+    bx      lr
+
+FUNCTION(arch_atomic_or)
+.Lloop_atomic_or:
+    ldrex   r12, [r0]
+    orr     r2, r12, r1
+    strex   r3, r2, [r0]
+    cmp     r3, #0
+    bne     .Lloop_atomic_or
+    mov     r0, r12
+    bx      lr