diff options
| author | Richard Henderson <rth@twiddle.net> | 2016-06-29 21:10:59 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@twiddle.net> | 2016-10-26 08:29:01 -0700 |
| commit | 7ebee43ee3e2fcd7b5063058b7ef74bc43216733 (patch) | |
| tree | 366db1d66ff70d8332b6fb38b07085a0f79c6293 /tcg | |
| parent | c482cb117cc418115ca9c6d21a7a2315414c0a40 (diff) | |
| download | qemu-7ebee43ee3e2fcd7b5063058b7ef74bc43216733.tar.gz | |
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.h | 24 |
1 files changed, 23 insertions, 1 deletions
@@ -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 */ |