[Qemu-devel] [PATCH v1 15/29] target-microblaze: Break out trap_userspace()

["Edgar E. Iglesias" <edgar.iglesias@gmail.com>]

From: "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>

Break out trap_userspace() to avoid open coding it everywhere.
For privileged insns, we now always stop translation of the
current insn for cores without exceptions.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
---
 target/microblaze/translate.c | 76 +++++++++++++++----------------------------
 1 file changed, 27 insertions(+), 49 deletions(-)

diff --git a/target/microblaze/translate.c b/target/microblaze/translate.c
index 57cd00ab3e..c0e8879416 100644
--- a/target/microblaze/translate.c
+++ b/target/microblaze/translate.c
@@ -179,6 +179,22 @@ static void write_carryi(DisasContext *dc, bool carry)
     tcg_temp_free_i32(t0);
 }
 
+/*
+ * Returns true if the insn is illegal in userspace.
+ * If exceptions are enabled, an exception is raised.
+ */
+static bool trap_userspace(DisasContext *dc, bool cond)
+{
+    int mem_index = cpu_mmu_index(&dc->cpu->env, false);
+    bool cond_user = cond && mem_index == MMU_USER_IDX;
+
+    if (cond_user && (dc->tb_flags & MSR_EE_FLAG)) {
+        tcg_gen_movi_i32(cpu_SR[SR_ESR], ESR_EC_PRIVINSN);
+        t_gen_raise_exception(dc, EXCP_HW_EXCP);
+    }
+    return cond_user;
+}
+
 /* True if ALU operand b is a small immediate that may deserve
    faster treatment.  */
 static inline int dec_alu_op_b_is_small_imm(DisasContext *dc)
@@ -432,7 +448,6 @@ static void dec_msr(DisasContext *dc)
     CPUState *cs = CPU(dc->cpu);
     TCGv_i32 t0, t1;
     unsigned int sr, to, rn;
-    int mem_index = cpu_mmu_index(&dc->cpu->env, false);
 
     sr = dc->imm & ((1 << 14) - 1);
     to = dc->imm & (1 << 14);
@@ -452,10 +467,7 @@ static void dec_msr(DisasContext *dc)
             return;
         }
 
-        if ((dc->tb_flags & MSR_EE_FLAG)
-            && mem_index == MMU_USER_IDX && (dc->imm != 4 && dc->imm != 0)) {
-            tcg_gen_movi_i32(cpu_SR[SR_ESR], ESR_EC_PRIVINSN);
-            t_gen_raise_exception(dc, EXCP_HW_EXCP);
+        if (trap_userspace(dc, dc->imm != 4 && dc->imm != 0)) {
             return;
         }
 
@@ -480,13 +492,8 @@ static void dec_msr(DisasContext *dc)
         return;
     }
 
-    if (to) {
-        if ((dc->tb_flags & MSR_EE_FLAG)
-             && mem_index == MMU_USER_IDX) {
-            tcg_gen_movi_i32(cpu_SR[SR_ESR], ESR_EC_PRIVINSN);
-            t_gen_raise_exception(dc, EXCP_HW_EXCP);
-            return;
-        }
+    if (trap_userspace(dc, to)) {
+        return;
     }
 
 #if !defined(CONFIG_USER_ONLY)
@@ -738,7 +745,6 @@ static void dec_bit(DisasContext *dc)
     CPUState *cs = CPU(dc->cpu);
     TCGv_i32 t0;
     unsigned int op;
-    int mem_index = cpu_mmu_index(&dc->cpu->env, false);
 
     op = dc->ir & ((1 << 9) - 1);
     switch (op) {
@@ -784,22 +790,12 @@ static void dec_bit(DisasContext *dc)
         case 0x76:
             /* wdc.  */
             LOG_DIS("wdc r%d\n", dc->ra);
-            if ((dc->tb_flags & MSR_EE_FLAG)
-                 && mem_index == MMU_USER_IDX) {
-                tcg_gen_movi_i32(cpu_SR[SR_ESR], ESR_EC_PRIVINSN);
-                t_gen_raise_exception(dc, EXCP_HW_EXCP);
-                return;
-            }
+            trap_userspace(dc, true);
             break;
         case 0x68:
             /* wic.  */
             LOG_DIS("wic r%d\n", dc->ra);
-            if ((dc->tb_flags & MSR_EE_FLAG)
-                 && mem_index == MMU_USER_IDX) {
-                tcg_gen_movi_i32(cpu_SR[SR_ESR], ESR_EC_PRIVINSN);
-                t_gen_raise_exception(dc, EXCP_HW_EXCP);
-                return;
-            }
+            trap_userspace(dc, true);
             break;
         case 0xe0:
             if ((dc->tb_flags & MSR_EE_FLAG)
@@ -1199,7 +1195,6 @@ static void dec_bcc(DisasContext *dc)
 static void dec_br(DisasContext *dc)
 {
     unsigned int dslot, link, abs, mbar;
-    int mem_index = cpu_mmu_index(&dc->cpu->env, false);
 
     dslot = dc->ir & (1 << 20);
     abs = dc->ir & (1 << 19);
@@ -1254,9 +1249,7 @@ static void dec_br(DisasContext *dc)
             if (!(dc->tb_flags & IMM_FLAG) && (dc->imm == 8 || dc->imm == 0x18))
                 t_gen_raise_exception(dc, EXCP_BREAK);
             if (dc->imm == 0) {
-                if ((dc->tb_flags & MSR_EE_FLAG) && mem_index == MMU_USER_IDX) {
-                    tcg_gen_movi_i32(cpu_SR[SR_ESR], ESR_EC_PRIVINSN);
-                    t_gen_raise_exception(dc, EXCP_HW_EXCP);
+                if (trap_userspace(dc, true)) {
                     return;
                 }
 
@@ -1331,12 +1324,15 @@ static inline void do_rte(DisasContext *dc)
 static void dec_rts(DisasContext *dc)
 {
     unsigned int b_bit, i_bit, e_bit;
-    int mem_index = cpu_mmu_index(&dc->cpu->env, false);
 
     i_bit = dc->ir & (1 << 21);
     b_bit = dc->ir & (1 << 22);
     e_bit = dc->ir & (1 << 23);
 
+    if (trap_userspace(dc, i_bit || b_bit || e_bit)) {
+        return;
+    }
+
     dc->delayed_branch = 2;
     dc->tb_flags |= D_FLAG;
     tcg_gen_st_i32(tcg_const_i32(dc->type_b && (dc->tb_flags & IMM_FLAG)),
@@ -1344,27 +1340,12 @@ static void dec_rts(DisasContext *dc)
 
     if (i_bit) {
         LOG_DIS("rtid ir=%x\n", dc->ir);
-        if ((dc->tb_flags & MSR_EE_FLAG)
-             && mem_index == MMU_USER_IDX) {
-            tcg_gen_movi_i32(cpu_SR[SR_ESR], ESR_EC_PRIVINSN);
-            t_gen_raise_exception(dc, EXCP_HW_EXCP);
-        }
         dc->tb_flags |= DRTI_FLAG;
     } else if (b_bit) {
         LOG_DIS("rtbd ir=%x\n", dc->ir);
-        if ((dc->tb_flags & MSR_EE_FLAG)
-             && mem_index == MMU_USER_IDX) {
-            tcg_gen_movi_i32(cpu_SR[SR_ESR], ESR_EC_PRIVINSN);
-            t_gen_raise_exception(dc, EXCP_HW_EXCP);
-        }
         dc->tb_flags |= DRTB_FLAG;
     } else if (e_bit) {
         LOG_DIS("rted ir=%x\n", dc->ir);
-        if ((dc->tb_flags & MSR_EE_FLAG)
-             && mem_index == MMU_USER_IDX) {
-            tcg_gen_movi_i32(cpu_SR[SR_ESR], ESR_EC_PRIVINSN);
-            t_gen_raise_exception(dc, EXCP_HW_EXCP);
-        }
         dc->tb_flags |= DRTE_FLAG;
     } else
         LOG_DIS("rts ir=%x\n", dc->ir);
@@ -1503,16 +1484,13 @@ static void dec_null(DisasContext *dc)
 /* Insns connected to FSL or AXI stream attached devices.  */
 static void dec_stream(DisasContext *dc)
 {
-    int mem_index = cpu_mmu_index(&dc->cpu->env, false);
     TCGv_i32 t_id, t_ctrl;
     int ctrl;
 
     LOG_DIS("%s%s imm=%x\n", dc->rd ? "get" : "put",
             dc->type_b ? "" : "d", dc->imm);
 
-    if ((dc->tb_flags & MSR_EE_FLAG) && (mem_index == MMU_USER_IDX)) {
-        tcg_gen_movi_i32(cpu_SR[SR_ESR], ESR_EC_PRIVINSN);
-        t_gen_raise_exception(dc, EXCP_HW_EXCP);
+    if (trap_userspace(dc, true)) {
         return;
     }
 
-- 
2.14.1