[Xen-changelog] [xen-unstable] arm: compile memshr

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
# Date 1338364668 -3600
# Node ID 763fdfaccdd9319c642522237293f918ef4d8933
# Parent  ca2f97037bfdb49df1cfc442b913dc51839a85f5
arm: compile memshr

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Acked-by: Ian Campbell <Ian.campbell@xxxxxxxxxx>
Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Committed-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---


diff -r ca2f97037bfd -r 763fdfaccdd9 tools/memshr/bidir-hash.c
--- a/tools/memshr/bidir-hash.c Wed May 30 08:57:47 2012 +0100
+++ b/tools/memshr/bidir-hash.c Wed May 30 08:57:48 2012 +0100
@@ -109,6 +109,37 @@ static void      hash_resize(struct __ha
 } 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)
 {

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