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authorRichard Henderson <rth@twiddle.net>2016-06-29 21:10:59 -0700
committerRichard Henderson <rth@twiddle.net>2016-10-26 08:29:01 -0700
commit7ebee43ee3e2fcd7b5063058b7ef74bc43216733 (patch)
tree366db1d66ff70d8332b6fb38b07085a0f79c6293 /tcg
parentc482cb117cc418115ca9c6d21a7a2315414c0a40 (diff)
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tcg: Add atomic128 helpers
Force the use of cmpxchg16b on x86_64. Wikipedia suggests that only very old AMD64 (circa 2004) did not have this instruction. Further, it's required by Windows 8 so no new cpus will ever omit it. If we truely care about these, then we could check this at startup time and then avoid executing paths that use it. Reviewed-by: Emilio G. Cota <cota@braap.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'tcg')
-rw-r--r--tcg/tcg.h24
1 files changed, 23 insertions, 1 deletions
diff --git a/tcg/tcg.h b/tcg/tcg.h
index 5931965..bc3ea7a 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -1229,7 +1229,29 @@ GEN_ATOMIC_HELPER_ALL(xchg)
#undef GEN_ATOMIC_HELPER_ALL
#undef GEN_ATOMIC_HELPER
-
#endif /* CONFIG_SOFTMMU */
+#ifdef CONFIG_ATOMIC128
+#include "qemu/int128.h"
+
+/* These aren't really a "proper" helpers because TCG cannot manage Int128.
+ However, use the same format as the others, for use by the backends. */
+Int128 helper_atomic_cmpxchgo_le_mmu(CPUArchState *env, target_ulong addr,
+ Int128 cmpv, Int128 newv,
+ TCGMemOpIdx oi, uintptr_t retaddr);
+Int128 helper_atomic_cmpxchgo_be_mmu(CPUArchState *env, target_ulong addr,
+ Int128 cmpv, Int128 newv,
+ TCGMemOpIdx oi, uintptr_t retaddr);
+
+Int128 helper_atomic_ldo_le_mmu(CPUArchState *env, target_ulong addr,
+ TCGMemOpIdx oi, uintptr_t retaddr);
+Int128 helper_atomic_ldo_be_mmu(CPUArchState *env, target_ulong addr,
+ TCGMemOpIdx oi, uintptr_t retaddr);
+void helper_atomic_sto_le_mmu(CPUArchState *env, target_ulong addr, Int128 val,
+ TCGMemOpIdx oi, uintptr_t retaddr);
+void helper_atomic_sto_be_mmu(CPUArchState *env, target_ulong addr, Int128 val,
+ TCGMemOpIdx oi, uintptr_t retaddr);
+
+#endif /* CONFIG_ATOMIC128 */
+
#endif /* TCG_H */