target/hppa: Use delay_excp for conditional traps

Reviewed-by: Helge Deller <deller@gmx.de>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/hppa/helper.h

@@ -1,6 +1,5 @@
 DEF_HELPER_2(excp, noreturn, env, int)
 DEF_HELPER_FLAGS_2(tsv, TCG_CALL_NO_WG, void, env, tl)
-DEF_HELPER_FLAGS_2(tcond, TCG_CALL_NO_WG, void, env, tl)
 
 DEF_HELPER_FLAGS_3(stby_b, TCG_CALL_NO_WG, void, env, tl, tl)
 DEF_HELPER_FLAGS_3(stby_b_parallel, TCG_CALL_NO_WG, void, env, tl, tl)

target/hppa/int_helper.c

@@ -134,13 +134,13 @@ void hppa_cpu_do_interrupt(CPUState *cs)
         switch (i) {
         case EXCP_ILL:
         case EXCP_BREAK:
+        case EXCP_COND:
         case EXCP_PRIV_REG:
         case EXCP_PRIV_OPR:
             /* IIR set via translate.c.  */
             break;
 
         case EXCP_OVERFLOW:
-        case EXCP_COND:
         case EXCP_ASSIST:
         case EXCP_DTLB_MISS:
         case EXCP_NA_ITLB_MISS:

target/hppa/op_helper.c

@@ -49,13 +49,6 @@ void HELPER(tsv)(CPUHPPAState *env, target_ulong cond)
     }
 }
 
-void HELPER(tcond)(CPUHPPAState *env, target_ulong cond)
-{
-    if (unlikely(cond)) {
-        hppa_dynamic_excp(env, EXCP_COND, GETPC());
-    }
-}
-
 static void atomic_store_mask32(CPUHPPAState *env, target_ulong addr,
                                 uint32_t val, uint32_t mask, uintptr_t ra)
 {

target/hppa/translate.c

@@ -1117,6 +1117,25 @@ static TCGv_i64 do_sub_sv(DisasContext *ctx, TCGv_i64 res,
     return sv;
 }
 
+static void gen_tc(DisasContext *ctx, DisasCond *cond)
+{
+    DisasDelayException *e;
+
+    switch (cond->c) {
+    case TCG_COND_NEVER:
+        break;
+    case TCG_COND_ALWAYS:
+        gen_excp_iir(ctx, EXCP_COND);
+        break;
+    default:
+        e = delay_excp(ctx, EXCP_COND);
+        tcg_gen_brcond_i64(cond->c, cond->a0, cond->a1, e->lab);
+        /* In the non-trap path, the condition is known false. */
+        *cond = cond_make_f();
+        break;
+    }
+}
+
 static void do_add(DisasContext *ctx, unsigned rt, TCGv_i64 orig_in1,
                    TCGv_i64 in2, unsigned shift, bool is_l,
                    bool is_tsv, bool is_tc, bool is_c, unsigned cf, bool d)
@@ -1175,9 +1194,7 @@ static void do_add(DisasContext *ctx, unsigned rt, TCGv_i64 orig_in1,
     /* Emit any conditional trap before any writeback.  */
     cond = do_cond(ctx, cf, d, dest, uv, sv);
     if (is_tc) {
-        tmp = tcg_temp_new_i64();
+        gen_tc(ctx, &cond);
-        tcg_gen_setcond_i64(cond.c, tmp, cond.a0, cond.a1);
-        gen_helper_tcond(tcg_env, tmp);
     }
 
     /* Write back the result.  */
@@ -1196,6 +1213,10 @@ static bool do_add_reg(DisasContext *ctx, arg_rrr_cf_d_sh *a,
 {
     TCGv_i64 tcg_r1, tcg_r2;
 
+    if (unlikely(is_tc && a->cf == 1)) {
+        /* Unconditional trap on condition. */
+        return gen_excp_iir(ctx, EXCP_COND);
+    }
     if (a->cf) {
         nullify_over(ctx);
     }
@@ -1211,6 +1232,10 @@ static bool do_add_imm(DisasContext *ctx, arg_rri_cf *a,
 {
     TCGv_i64 tcg_im, tcg_r2;
 
+    if (unlikely(is_tc && a->cf == 1)) {
+        /* Unconditional trap on condition. */
+        return gen_excp_iir(ctx, EXCP_COND);
+    }
     if (a->cf) {
         nullify_over(ctx);
     }
@@ -1225,7 +1250,7 @@ static void do_sub(DisasContext *ctx, unsigned rt, TCGv_i64 in1,
                    TCGv_i64 in2, bool is_tsv, bool is_b,
                    bool is_tc, unsigned cf, bool d)
 {
-    TCGv_i64 dest, sv, cb, cb_msb, tmp;
+    TCGv_i64 dest, sv, cb, cb_msb;
     unsigned c = cf >> 1;
     DisasCond cond;
 
@@ -1273,9 +1298,7 @@ static void do_sub(DisasContext *ctx, unsigned rt, TCGv_i64 in1,
 
     /* Emit any conditional trap before any writeback.  */
     if (is_tc) {
-        tmp = tcg_temp_new_i64();
+        gen_tc(ctx, &cond);
-        tcg_gen_setcond_i64(cond.c, tmp, cond.a0, cond.a1);
-        gen_helper_tcond(tcg_env, tmp);
     }
 
     /* Write back the result.  */
@@ -1441,9 +1464,7 @@ static void do_unit_addsub(DisasContext *ctx, unsigned rt, TCGv_i64 in1,
     }
 
     if (is_tc) {
-        TCGv_i64 tmp = tcg_temp_new_i64();
+        gen_tc(ctx, &cond);
-        tcg_gen_setcond_i64(cond.c, tmp, cond.a0, cond.a1);
-        gen_helper_tcond(tcg_env, tmp);
     }
     save_gpr(ctx, rt, dest);