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# Add atomic operations for ARM.
diff --git a/nsprpub/pr/include/md/_linux.h b/nsprpub/pr/include/md/_linux.h
index 5b794c5..cb8d58e 100644
--- a/nsprpub/pr/include/md/_linux.h
+++ b/nsprpub/pr/include/md/_linux.h
@@ -194,6 +194,42 @@ extern PRInt32 _PR_x86_64_AtomicSet(PRInt32 *val, PRInt32 newval);
})
#endif
+#if defined(__arm__)
+#define _PR_HAVE_ATOMIC_OPS
+#define _MD_INIT_ATOMIC()
+
+typedef int (__kernel_cmpxchg_t)(int oldval, int newval, volatile int *ptr);
+#define __kernel_cmpxchg (*(__kernel_cmpxchg_t *)0xffff0fc0)
+
+#define _MD_ATOMIC_INCREMENT(ptr) _MD_ATOMIC_ADD(ptr, 1)
+#define _MD_ATOMIC_DECREMENT(ptr) _MD_ATOMIC_ADD(ptr, -1)
+#define _MD_ATOMIC_ADD(ptr, n) \
+ ({ \
+ PRInt32 ov, nv; \
+ volatile PRInt32 *vp = (ptr); \
+ \
+ do { \
+ ov = *vp; \
+ nv = ov + (n); \
+ } \
+ while (__kernel_cmpxchg(ov, nv, vp)); \
+ \
+ nv; \
+ })
+#define _MD_ATOMIC_SET(ptr, nv) \
+ ({ \
+ PRInt32 ov; \
+ volatile PRInt32 *vp = (ptr); \
+ \
+ do { \
+ ov = *vp; \
+ } \
+ while (__kernel_cmpxchg(ov, (nv), vp)); \
+ \
+ ov; \
+ })
+#endif
+
#define USE_SETJMP
#if defined(__GLIBC__) && __GLIBC__ >= 2
#define _PR_POLL_AVAILABLE
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