tcg: Add EXCP_ATOMIC

When we cannot emulate an atomic operation within a parallel
context, this exception allows us to stop the world and try
again in a serial context.

Reviewed-by: Emilio G. Cota <cota@braap.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/tcg/tcg.h b/tcg/tcg.h
index c9949aa79b..3b211560c8 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -704,6 +704,7 @@ struct TCGContext {
 };
 
 extern TCGContext tcg_ctx;
+extern bool parallel_cpus;
 
 static inline void tcg_set_insn_param(int op_idx, int arg, TCGArg v)
 {