[Xen-devel] [PATCH v7 2/8] arm: compile memshr

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Acked-by: Ian Campbell <Ian.campbell@xxxxxxxxxx>
Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
 tools/memshr/bidir-hash.c |   31 +++++++++++++++++++++++++++++++
 1 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/tools/memshr/bidir-hash.c b/tools/memshr/bidir-hash.c
index 6c0dc3d..45d473e 100644
--- a/tools/memshr/bidir-hash.c
+++ b/tools/memshr/bidir-hash.c
@@ -109,6 +109,37 @@ static void      hash_resize(struct __hash *h);
 } while (0)
 static inline void atomic_inc(uint32_t *v) { ia64_fetchadd4_rel(v, 1); }
 static inline void atomic_dec(uint32_t *v) { ia64_fetchadd4_rel(v, -1); }
+#elif defined(__arm__)
+static inline void atomic_inc(uint32_t *v)
+{
+        unsigned long tmp;
+        int result;
+
+        __asm__ __volatile__("@ atomic_add\n"
+"1:     ldrex   %0, [%3]\n"
+"       add     %0, %0, #1\n"
+"       strex   %1, %0, [%3]\n"
+"       teq     %1, #0\n"
+"       bne     1b"
+        : "=&r" (result), "=&r" (tmp), "+Qo" (*v)
+        : "r" (v)
+        : "cc");
+}
+static inline void atomic_dec(uint32_t *v)
+{
+        unsigned long tmp;
+        int result;
+
+        __asm__ __volatile__("@ atomic_sub\n"
+"1:     ldrex   %0, [%3]\n"
+"       sub     %0, %0, #1\n"
+"       strex   %1, %0, [%3]\n"
+"       teq     %1, #0\n"
+"       bne     1b"
+        : "=&r" (result), "=&r" (tmp), "+Qo" (*v)
+        : "r" (v)
+        : "cc");
+}
 #else /* __x86__ */
 static inline void atomic_inc(uint32_t *v)
 {
-- 
1.7.2.5


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