[Qemu-devel] [PATCH 1/4] lm32: fix exception handling

[Michael Walle]

Global interrupt enable bit is already saved within the exception handler
helper routine. Thus remove extra code in translation routines.

Additionally, debug exceptions has always DEBA as base address.

Signed-off-by: Michael Walle <address@hidden>
---
 target-lm32/helper.c    |    6 +-----
 target-lm32/translate.c |   26 --------------------------
 2 files changed, 1 insertions(+), 31 deletions(-)

diff --git a/target-lm32/helper.c b/target-lm32/helper.c
index 318e2cf..4f3e7e0 100644
--- a/target-lm32/helper.c
+++ b/target-lm32/helper.c
@@ -76,11 +76,7 @@ void do_interrupt(CPUState *env)
         env->regs[R_BA] = env->pc;
         env->ie |= (env->ie & IE_IE) ? IE_BIE : 0;
         env->ie &= ~IE_IE;
-        if (env->dc & DC_RE) {
-            env->pc = env->deba + (env->exception_index * 32);
-        } else {
-            env->pc = env->eba + (env->exception_index * 32);
-        }
+        env->pc = env->deba + (env->exception_index * 32);
         log_cpu_state_mask(CPU_LOG_INT, env, 0);
         break;
     default:
diff --git a/target-lm32/translate.c b/target-lm32/translate.c
index ccdf959..2cfa253 100644
--- a/target-lm32/translate.c
+++ b/target-lm32/translate.c
@@ -614,36 +614,10 @@ static void dec_scall(DisasContext *dc)
     t0 = tcg_temp_new();
     l1 = gen_new_label();
 
-    /* save IE.IE */
-    tcg_gen_andi_tl(t0, cpu_ie, IE_IE);
-
-    /* IE.IE = 0 */
-    tcg_gen_andi_tl(cpu_ie, cpu_ie, ~IE_IE);
-
     if (dc->imm5 == 7) {
-        /* IE.EIE = IE.IE */
-        tcg_gen_ori_tl(cpu_ie, cpu_ie, IE_EIE);
-        tcg_gen_brcondi_tl(TCG_COND_EQ, t0, IE_IE, l1);
-        tcg_gen_andi_tl(cpu_ie, cpu_ie, ~IE_EIE);
-        gen_set_label(l1);
-
-        /* gpr[ea] = PC */
-        tcg_gen_movi_tl(cpu_R[R_EA], dc->pc);
-        tcg_temp_free(t0);
-
         tcg_gen_movi_tl(cpu_pc, dc->pc);
         t_gen_raise_exception(dc, EXCP_SYSTEMCALL);
     } else {
-        /* IE.BIE = IE.IE */
-        tcg_gen_ori_tl(cpu_ie, cpu_ie, IE_BIE);
-        tcg_gen_brcondi_tl(TCG_COND_EQ, t0, IE_IE, l1);
-        tcg_gen_andi_tl(cpu_ie, cpu_ie, ~IE_BIE);
-        gen_set_label(l1);
-
-        /* gpr[ba] = PC */
-        tcg_gen_movi_tl(cpu_R[R_BA], dc->pc);
-        tcg_temp_free(t0);
-
         tcg_gen_movi_tl(cpu_pc, dc->pc);
         t_gen_raise_exception(dc, EXCP_BREAKPOINT);
     }
-- 
1.7.2.3