tcg: Allow extra data to be attached to insn_start

With an eye toward having this data replace the gen_opc_* arrays
that each target collects in order to enable restore_state_from_tb.

Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/tcg/tcg.h b/tcg/tcg.h
index 879a665012..c975076b84 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -129,6 +129,12 @@ typedef uint64_t TCGRegSet;
 # error "Missing unsigned widening multiply"
 #endif
 
+#ifndef TARGET_INSN_START_EXTRA_WORDS
+# define TARGET_INSN_START_WORDS 1
+#else
+# define TARGET_INSN_START_WORDS (1 + TARGET_INSN_START_EXTRA_WORDS)
+#endif
+
 typedef enum TCGOpcode {
 #define DEF(name, oargs, iargs, cargs, flags) INDEX_op_ ## name,
 #include "tcg-opc.h"