target-arm: A64: Avoid duplicate exit_tb(0) in non-linked goto_tb

If gen_goto_tb() decides not to link the two TBs, then the
fallback path generates unnecessary code:
 * if singlestep is enabled then we generate unreachable code
   after the gen_exception_internal(EXCP_DEBUG)
 * if singlestep is disabled then we will generate exit_tb(0)
   twice, once in gen_goto_tb() and once coming out of the
   main loop with is_jmp set to DISAS_JUMP

Correct these deficiencies by only emitting exit_tb() in the
non-singlestep case, in which case we can use DISAS_TB_JUMP
to suppress the main-loop exit_tb().

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>

diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c
index 2e21948df0566f54886e4593db74f3d230bb732a..21a997fe23c6ce34540185a8602bee820ab454fe 100644 (file)
--- a/target-arm/translate-a64.c
+++ b/target-arm/translate-a64.c
@@ -234,9 +234,10 @@ static inline void gen_goto_tb(DisasContext *s, int n, uint64_t dest)
         gen_a64_set_pc_im(dest);
         if (s->singlestep_enabled) {
             gen_exception_internal(EXCP_DEBUG);
+        } else {
+            tcg_gen_exit_tb(0);
+            s->is_jmp = DISAS_TB_JUMP;
         }
-        tcg_gen_exit_tb(0);
-        s->is_jmp = DISAS_JUMP;
     }
 }