target/m68k: Perform the semihosting test during translate

Replace EXCP_HALT_INSN by EXCP_SEMIHOSTING.  Perform the pre-
and post-insn tests during translate, leaving only the actual
semihosting operation for the exception.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 2 insertions, 12 deletions

diff --git a/target/m68k/op_helper.c b/target/m68k/op_helper.c
index 125f6c1b08..15bad5dd46 100644
--- a/target/m68k/op_helper.c
+++ b/target/m68k/op_helper.c
@@ -202,18 +202,8 @@ static void cf_interrupt_all(CPUM68KState *env, int is_hw)
             /* Return from an exception.  */
             cf_rte(env);
             return;
-        case EXCP_HALT_INSN:
-            if (semihosting_enabled((env->sr & SR_S) == 0)
-                    && (env->pc & 3) == 0
-                    && cpu_lduw_code(env, env->pc - 4) == 0x4e71
-                    && cpu_ldl_code(env, env->pc) == 0x4e7bf000) {
-                env->pc += 4;
-                do_m68k_semihosting(env, env->dregs[0]);
-                return;
-            }
-            cs->halted = 1;
-            cs->exception_index = EXCP_HLT;
-            cpu_loop_exit(cs);
+        case EXCP_SEMIHOSTING:
+            do_m68k_semihosting(env, env->dregs[0]);
             return;
         }
     }