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# HG changeset patch
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# User aph
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# Date 1338206478 14400
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# Mon May 28 08:01:18 2012 -0400
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# Node ID 6275d7b419091092752d5a1854194c98897892ba
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# Parent be1379a186ba527b32c93a83e04c9600735fe44b
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PR3559: Use ldrexd for atomic reads on ARMv7.
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2012-05-28 Andrew Haley <aph@redhat.com>
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* os_linux_zero.hpp (atomic_copy64): Use ldrexd for atomic reads
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on ARMv7.
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diff --git openjdk.orig/hotspot/src/os_cpu/linux_zero/vm/os_linux_zero.hpp openjdk/hotspot/src/os_cpu/linux_zero/vm/os_linux_zero.hpp
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--- openjdk.orig/hotspot/src/os_cpu/linux_zero/vm/os_linux_zero.hpp
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+++ openjdk/hotspot/src/os_cpu/linux_zero/vm/os_linux_zero.hpp
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@@ -54,6 +54,12 @@
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"std %0, 0(%2)\n"
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: "=r"(tmp)
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: "a"(src), "a"(dst));
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+#elif defined(__ARM_ARCH_7A__)
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+ jlong tmp;
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+ asm volatile ("ldrexd %0, [%1]\n"
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+ : "=r"(tmp)
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+ : "r"(src), "m"(src));
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+ *(jlong *) dst = tmp;
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#else
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*(jlong *) dst = *(jlong *) src;
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#endif
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