1 files changed, 38 insertions, 142 deletions

diff --git a/arch/arm/atomic_arch.h b/arch/arm/atomic_arch.h
index 5ab20a55..a52254b2 100644
--- a/arch/arm/atomic_arch.h
+++ b/arch/arm/atomic_arch.h
@@ -1,168 +1,64 @@
-#if __ARM_ARCH_7A__ || __ARM_ARCH_7R__ ||  __ARM_ARCH >= 7
+__attribute__((__visibility__("hidden")))
+extern const void *__arm_atomics[3]; /* gettp, cas, barrier */
 
-#define a_barrier a_barrier
-static inline void a_barrier()
-{
-	__asm__ __volatile__("dmb ish");
-}
+#if ((__ARM_ARCH_6__ || __ARM_ARCH_6K__ || __ARM_ARCH_6ZK__) && !__thumb__) \
+ || __ARM_ARCH_7A__ || __ARM_ARCH_7R__ ||  __ARM_ARCH >= 7
 
-#define a_cas a_cas
-static inline int a_cas(volatile int *p, int t, int s)
+#define a_ll a_ll
+static inline int a_ll(volatile int *p)
 {
-	int old;
-	__asm__ __volatile__(
-		"	dmb ish\n"
-		"1:	ldrex %0,%3\n"
-		"	cmp %0,%1\n"
-		"	bne 1f\n"
-		"	strex %0,%2,%3\n"
-		"	cmp %0, #0\n"
-		"	bne 1b\n"
-		"	mov %0, %1\n"
-		"1:	dmb ish\n"
-		: "=&r"(old)
-		: "r"(t), "r"(s), "Q"(*p)
-		: "memory", "cc" );
-	return old;
+	int v;
+	__asm__ __volatile__ ("ldrex %0, %1" : "=r"(v) : "Q"(*p));
+	return v;
 }
 
-#define a_swap a_swap
-static inline int a_swap(volatile int *x, int v)
+#define a_sc a_sc
+static inline int a_sc(volatile int *p, int v)
 {
-	int old, tmp;
-	__asm__ __volatile__(
-		"	dmb ish\n"
-		"1:	ldrex %0,%3\n"
-		"	strex %1,%2,%3\n"
-		"	cmp %1, #0\n"
-		"	bne 1b\n"
-		"	dmb ish\n"
-		: "=&r"(old), "=&r"(tmp)
-		: "r"(v), "Q"(*x)
-		: "memory", "cc" );
-	return old;
+	int r;
+	__asm__ __volatile__ ("strex %0,%1,%2" : "=&r"(r) : "r"(v), "Q"(*p) : "memory");
+	return !r;
 }
 
-#define a_fetch_add a_fetch_add
-static inline int a_fetch_add(volatile int *x, int v)
-{
-	int old, tmp;
-	__asm__ __volatile__(
-		"	dmb ish\n"
-		"1:	ldrex %0,%3\n"
-		"	add %0,%0,%2\n"
-		"	strex %1,%0,%3\n"
-		"	cmp %1, #0\n"
-		"	bne 1b\n"
-		"	dmb ish\n"
-		: "=&r"(old), "=&r"(tmp)
-		: "r"(v), "Q"(*x)
-		: "memory", "cc" );
-	return old-v;
-}
+#if __ARM_ARCH_7A__ || __ARM_ARCH_7R__ ||  __ARM_ARCH >= 7
 
-#define a_inc a_inc
-static inline void a_inc(volatile int *x)
+#define a_barrier a_barrier
+static inline void a_barrier()
 {
-	int tmp, tmp2;
-	__asm__ __volatile__(
-		"	dmb ish\n"
-		"1:	ldrex %0,%2\n"
-		"	add %0,%0,#1\n"
-		"	strex %1,%0,%2\n"
-		"	cmp %1, #0\n"
-		"	bne 1b\n"
-		"	dmb ish\n"
-		: "=&r"(tmp), "=&r"(tmp2)
-		: "Q"(*x)
-		: "memory", "cc" );
+	__asm__ __volatile__ ("dmb ish" : : : "memory");
 }
 
-#define a_dec a_dec
-static inline void a_dec(volatile int *x)
-{
-	int tmp, tmp2;
-	__asm__ __volatile__(
-		"	dmb ish\n"
-		"1:	ldrex %0,%2\n"
-		"	sub %0,%0,#1\n"
-		"	strex %1,%0,%2\n"
-		"	cmp %1, #0\n"
-		"	bne 1b\n"
-		"	dmb ish\n"
-		: "=&r"(tmp), "=&r"(tmp2)
-		: "Q"(*x)
-		: "memory", "cc" );
-}
+#endif
 
-#define a_and a_and
-static inline void a_and(volatile int *x, int v)
-{
-	int tmp, tmp2;
-	__asm__ __volatile__(
-		"	dmb ish\n"
-		"1:	ldrex %0,%3\n"
-		"	and %0,%0,%2\n"
-		"	strex %1,%0,%3\n"
-		"	cmp %1, #0\n"
-		"	bne 1b\n"
-		"	dmb ish\n"
-		: "=&r"(tmp), "=&r"(tmp2)
-		: "r"(v), "Q"(*x)
-		: "memory", "cc" );
-}
+#define a_pre_llsc a_barrier
+#define a_post_llsc a_barrier
 
-#define a_or a_or
-static inline void a_or(volatile int *x, int v)
-{
-	int tmp, tmp2;
-	__asm__ __volatile__(
-		"	dmb ish\n"
-		"1:	ldrex %0,%3\n"
-		"	orr %0,%0,%2\n"
-		"	strex %1,%0,%3\n"
-		"	cmp %1, #0\n"
-		"	bne 1b\n"
-		"	dmb ish\n"
-		: "=&r"(tmp), "=&r"(tmp2)
-		: "r"(v), "Q"(*x)
-		: "memory", "cc" );
-}
+#else
 
-#define a_store a_store
-static inline void a_store(volatile int *p, int x)
+#define a_cas a_cas
+static inline int a_cas(volatile int *p, int t, int s)
 {
-	__asm__ __volatile__(
-		"	dmb ish\n"
-		"	str %1,%0\n"
-		"	dmb ish\n"
-		: "=m"(*p)
-		: "r"(x)
-		: "memory", "cc" );
+	for (;;) {
+		register int r0 __asm__("r0") = t;
+		register int r1 __asm__("r1") = s;
+		register volatile int *r2 __asm__("r2") = p;
+		int old;
+		__asm__ __volatile__ (
+			"bl __a_cas"
+			: "+r"(r0) : "r"(r1), "r"(r2)
+			: "memory", "r3", "lr", "ip", "cc" );
+		if (!r0) return t;
+		if ((old=*p)!=t) return old;
+	}
 }
 
-#else
-
-int __a_cas(int, int, volatile int *) __attribute__((__visibility__("hidden")));
-#define __k_cas __a_cas
+#endif
 
+#ifndef a_barrier
 #define a_barrier a_barrier
 static inline void a_barrier()
 {
 	__asm__ __volatile__("bl __a_barrier"
 		: : : "memory", "cc", "ip", "lr" );
 }
-
-#define a_cas a_cas
-static inline int a_cas(volatile int *p, int t, int s)
-{
-	int old;
-	for (;;) {
-		if (!__k_cas(t, s, p))
-			return t;
-		if ((old=*p) != t)
-			return old;
-	}
-}
-
 #endif