target/microblaze: Put MicroBlazeCPUConfig into DisasContext

The bulk of the translator should not have access to the
complete cpu state, to avoid the temptation to examine bits
that are in run time, but not translation time context.

We do need access to the constant cpu configuration, and
that is sufficient, so put that into DisasContext.

Tested-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/microblaze/translate.c

@@ -60,7 +60,7 @@ static TCGv_i32 cpu_res_val;
 /* This is the state at translation time.  */
 typedef struct DisasContext {
     DisasContextBase base;
-    MicroBlazeCPU *cpu;
+    const MicroBlazeCPUConfig *cfg;
 
     /* TCG op of the current insn_start.  */
     TCGOp *insn_start;
@@ -159,7 +159,7 @@ static void gen_goto_tb(DisasContext *dc, int n, target_ulong dest)
 static bool trap_illegal(DisasContext *dc, bool cond)
 {
     if (cond && (dc->tb_flags & MSR_EE)
-        && dc->cpu->cfg.illegal_opcode_exception) {
+        && dc->cfg->illegal_opcode_exception) {
         gen_raise_hw_excp(dc, ESR_EC_ILLEGAL_OP);
     }
     return cond;
@@ -291,7 +291,7 @@ static bool do_typeb_val(DisasContext *dc, arg_typeb *arg, bool side_effects,
 
 #define DO_TYPEA_CFG(NAME, CFG, SE, FN) \
     static bool trans_##NAME(DisasContext *dc, arg_typea *a) \
-    { return dc->cpu->cfg.CFG && do_typea(dc, a, SE, FN); }
+    { return dc->cfg->CFG && do_typea(dc, a, SE, FN); }
 
 #define DO_TYPEA0(NAME, SE, FN) \
     static bool trans_##NAME(DisasContext *dc, arg_typea0 *a) \
@@ -299,7 +299,7 @@ static bool do_typeb_val(DisasContext *dc, arg_typeb *arg, bool side_effects,
 
 #define DO_TYPEA0_CFG(NAME, CFG, SE, FN) \
     static bool trans_##NAME(DisasContext *dc, arg_typea0 *a) \
-    { return dc->cpu->cfg.CFG && do_typea0(dc, a, SE, FN); }
+    { return dc->cfg->CFG && do_typea0(dc, a, SE, FN); }
 
 #define DO_TYPEBI(NAME, SE, FNI) \
     static bool trans_##NAME(DisasContext *dc, arg_typeb *a) \
@@ -307,7 +307,7 @@ static bool do_typeb_val(DisasContext *dc, arg_typeb *arg, bool side_effects,
 
 #define DO_TYPEBI_CFG(NAME, CFG, SE, FNI) \
     static bool trans_##NAME(DisasContext *dc, arg_typeb *a) \
-    { return dc->cpu->cfg.CFG && do_typeb_imm(dc, a, SE, FNI); }
+    { return dc->cfg->CFG && do_typeb_imm(dc, a, SE, FNI); }
 
 #define DO_TYPEBV(NAME, SE, FN) \
     static bool trans_##NAME(DisasContext *dc, arg_typeb *a) \
@@ -683,7 +683,7 @@ static TCGv compute_ldst_addr_typea(DisasContext *dc, int ra, int rb)
         tcg_gen_movi_tl(ret, 0);
     }
 
-    if ((ra == 1 || rb == 1) && dc->cpu->cfg.stackprot) {
+    if ((ra == 1 || rb == 1) && dc->cfg->stackprot) {
         gen_helper_stackprot(cpu_env, ret);
     }
     return ret;
@@ -703,7 +703,7 @@ static TCGv compute_ldst_addr_typeb(DisasContext *dc, int ra, int imm)
         tcg_gen_movi_tl(ret, (uint32_t)imm);
     }
 
-    if (ra == 1 && dc->cpu->cfg.stackprot) {
+    if (ra == 1 && dc->cfg->stackprot) {
         gen_helper_stackprot(cpu_env, ret);
     }
     return ret;
@@ -712,7 +712,7 @@ static TCGv compute_ldst_addr_typeb(DisasContext *dc, int ra, int imm)
 #ifndef CONFIG_USER_ONLY
 static TCGv compute_ldst_addr_ea(DisasContext *dc, int ra, int rb)
 {
-    int addr_size = dc->cpu->cfg.addr_size;
+    int addr_size = dc->cfg->addr_size;
     TCGv ret = tcg_temp_new();
 
     if (addr_size == 32 || ra == 0) {
@@ -772,7 +772,7 @@ static bool do_load(DisasContext *dc, int rd, TCGv addr, MemOp mop,
 
     if (size > MO_8 &&
         (dc->tb_flags & MSR_EE) &&
-        dc->cpu->cfg.unaligned_exceptions) {
+        dc->cfg->unaligned_exceptions) {
         record_unaligned_ess(dc, rd, size, false);
         mop |= MO_ALIGN;
     }
@@ -918,7 +918,7 @@ static bool do_store(DisasContext *dc, int rd, TCGv addr, MemOp mop,
 
     if (size > MO_8 &&
         (dc->tb_flags & MSR_EE) &&
-        dc->cpu->cfg.unaligned_exceptions) {
+        dc->cfg->unaligned_exceptions) {
         record_unaligned_ess(dc, rd, size, true);
         mop |= MO_ALIGN;
     }
@@ -1325,7 +1325,7 @@ DO_RTS(rtsd, 0)
 static bool trans_zero(DisasContext *dc, arg_zero *arg)
 {
     /* If opcode_0_illegal, trap.  */
-    if (dc->cpu->cfg.opcode_0_illegal) {
+    if (dc->cfg->opcode_0_illegal) {
         trap_illegal(dc, true);
         return true;
     }
@@ -1658,7 +1658,7 @@ static void mb_tr_init_disas_context(DisasContextBase *dcb, CPUState *cs)
     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
     int bound;
 
-    dc->cpu = cpu;
+    dc->cfg = &cpu->cfg;
     dc->tb_flags = dc->base.tb->flags;
     dc->ext_imm = dc->base.tb->cs_base;
     dc->r0 = NULL;