target/microblaze: Split out MSR from env->sregs

Continue eliminating the sregs array in favor of individual members.
Does not correct the width of MSR, yet.

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>

6 files changed, 51 insertions, 49 deletions

diff --git a/target/microblaze/cpu.c b/target/microblaze/cpu.c
index bde9992535..0eac068570 100644
--- a/target/microblaze/cpu.c
+++ b/target/microblaze/cpu.c
@@ -121,9 +121,9 @@ static void mb_cpu_reset(DeviceState *dev)
 
 #if defined(CONFIG_USER_ONLY)
     /* start in user mode with interrupts enabled.  */
-    env->sregs[SR_MSR] = MSR_EE | MSR_IE | MSR_VM | MSR_UM;
+    env->msr = MSR_EE | MSR_IE | MSR_VM | MSR_UM;
 #else
-    env->sregs[SR_MSR] = 0;
+    env->msr = 0;
     mmu_init(&env->mmu);
     env->mmu.c_mmu = 3;
     env->mmu.c_mmu_tlb_access = 3;
diff --git a/target/microblaze/cpu.h b/target/microblaze/cpu.h
index d1f91bb318..36de61d9f9 100644
--- a/target/microblaze/cpu.h
+++ b/target/microblaze/cpu.h
@@ -237,6 +237,7 @@ struct CPUMBState {
     uint32_t imm;
     uint32_t regs[32];
     uint64_t pc;
+    uint64_t msr;
     uint64_t sregs[14];
     float_status fp_status;
     /* Stack protectors. Yes, it's a hw feature.  */
@@ -355,7 +356,7 @@ static inline void cpu_get_tb_cpu_state(CPUMBState *env, target_ulong *pc,
     *pc = env->pc;
     *cs_base = 0;
     *flags = (env->iflags & IFLAGS_TB_MASK) |
-                 (env->sregs[SR_MSR] & (MSR_UM | MSR_VM | MSR_EE));
+             (env->msr & (MSR_UM | MSR_VM | MSR_EE));
 }
 
 #if !defined(CONFIG_USER_ONLY)
@@ -370,11 +371,11 @@ static inline int cpu_mmu_index(CPUMBState *env, bool ifetch)
     MicroBlazeCPU *cpu = env_archcpu(env);
 
     /* Are we in nommu mode?.  */
-    if (!(env->sregs[SR_MSR] & MSR_VM) || !cpu->cfg.use_mmu) {
+    if (!(env->msr & MSR_VM) || !cpu->cfg.use_mmu) {
         return MMU_NOMMU_IDX;
     }
 
-    if (env->sregs[SR_MSR] & MSR_UM) {
+    if (env->msr & MSR_UM) {
         return MMU_USER_IDX;
     }
     return MMU_KERNEL_IDX;
diff --git a/target/microblaze/gdbstub.c b/target/microblaze/gdbstub.c
index 9ea31f8d2f..e4c4936a7a 100644
--- a/target/microblaze/gdbstub.c
+++ b/target/microblaze/gdbstub.c
@@ -62,7 +62,7 @@ int mb_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
         val = env->pc;
         break;
     case GDB_MSR:
-        val = env->sregs[SR_MSR];
+        val = env->msr;
         break;
     case GDB_EAR:
         val = env->sregs[SR_EAR];
@@ -118,7 +118,7 @@ int mb_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
         env->pc = tmp;
         break;
     case GDB_MSR:
-        env->sregs[SR_MSR] = tmp;
+        env->msr = tmp;
         break;
     case GDB_EAR:
         env->sregs[SR_EAR] = tmp;
diff --git a/target/microblaze/helper.c b/target/microblaze/helper.c
index 5c392deea4..a18314540f 100644
--- a/target/microblaze/helper.c
+++ b/target/microblaze/helper.c
@@ -117,7 +117,7 @@ void mb_cpu_do_interrupt(CPUState *cs)
     /* IMM flag cannot propagate across a branch and into the dslot.  */
     assert(!((env->iflags & D_FLAG) && (env->iflags & IMM_FLAG)));
     assert(!(env->iflags & (DRTI_FLAG | DRTE_FLAG | DRTB_FLAG)));
-/*    assert(env->sregs[SR_MSR] & (MSR_EE)); Only for HW exceptions.  */
+/*    assert(env->msr & (MSR_EE)); Only for HW exceptions.  */
     env->res_addr = RES_ADDR_NONE;
     switch (cs->exception_index) {
         case EXCP_HW_EXCP:
@@ -136,11 +136,11 @@ void mb_cpu_do_interrupt(CPUState *cs)
             }
 
             /* Disable the MMU.  */
-            t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
-            env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
-            env->sregs[SR_MSR] |= t;
+            t = (env->msr & (MSR_VM | MSR_UM)) << 1;
+            env->msr &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
+            env->msr |= t;
             /* Exception in progress.  */
-            env->sregs[SR_MSR] |= MSR_EIP;
+            env->msr |= MSR_EIP;
 
             qemu_log_mask(CPU_LOG_INT,
                           "hw exception at pc=%" PRIx64 " ear=%" PRIx64 " "
@@ -179,11 +179,11 @@ void mb_cpu_do_interrupt(CPUState *cs)
             }
 
             /* Disable the MMU.  */
-            t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
-            env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
-            env->sregs[SR_MSR] |= t;
+            t = (env->msr & (MSR_VM | MSR_UM)) << 1;
+            env->msr &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
+            env->msr |= t;
             /* Exception in progress.  */
-            env->sregs[SR_MSR] |= MSR_EIP;
+            env->msr |= MSR_EIP;
 
             qemu_log_mask(CPU_LOG_INT,
                           "exception at pc=%" PRIx64 " ear=%" PRIx64 " "
@@ -195,11 +195,11 @@ void mb_cpu_do_interrupt(CPUState *cs)
             break;
 
         case EXCP_IRQ:
-            assert(!(env->sregs[SR_MSR] & (MSR_EIP | MSR_BIP)));
-            assert(env->sregs[SR_MSR] & MSR_IE);
+            assert(!(env->msr & (MSR_EIP | MSR_BIP)));
+            assert(env->msr & MSR_IE);
             assert(!(env->iflags & D_FLAG));
 
-            t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
+            t = (env->msr & (MSR_VM | MSR_UM)) << 1;
 
 #if 0
 #include "disas/disas.h"
@@ -216,7 +216,7 @@ void mb_cpu_do_interrupt(CPUState *cs)
 
                     qemu_log(
                          "interrupt at pc=%x msr=%x %x iflags=%x sym=%s\n",
-                         env->pc, env->sregs[SR_MSR], t, env->iflags,
+                         env->pc, env->msr, t, env->iflags,
                          sym);
 
                     log_cpu_state(cs, 0);
@@ -226,11 +226,10 @@ void mb_cpu_do_interrupt(CPUState *cs)
             qemu_log_mask(CPU_LOG_INT,
                          "interrupt at pc=%" PRIx64 " msr=%" PRIx64 " %x "
                          "iflags=%x\n",
-                         env->pc, env->sregs[SR_MSR], t, env->iflags);
+                         env->pc, env->msr, t, env->iflags);
 
-            env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM \
-                                    | MSR_UM | MSR_IE);
-            env->sregs[SR_MSR] |= t;
+            env->msr &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM | MSR_IE);
+            env->msr |= t;
 
             env->regs[14] = env->pc;
             env->pc = cpu->cfg.base_vectors + 0x10;
@@ -241,18 +240,18 @@ void mb_cpu_do_interrupt(CPUState *cs)
         case EXCP_HW_BREAK:
             assert(!(env->iflags & IMM_FLAG));
             assert(!(env->iflags & D_FLAG));
-            t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
+            t = (env->msr & (MSR_VM | MSR_UM)) << 1;
             qemu_log_mask(CPU_LOG_INT,
                         "break at pc=%" PRIx64 " msr=%" PRIx64 " %x "
                         "iflags=%x\n",
-                        env->pc, env->sregs[SR_MSR], t, env->iflags);
+                        env->pc, env->msr, t, env->iflags);
             log_cpu_state_mask(CPU_LOG_INT, cs, 0);
-            env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
-            env->sregs[SR_MSR] |= t;
-            env->sregs[SR_MSR] |= MSR_BIP;
+            env->msr &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
+            env->msr |= t;
+            env->msr |= MSR_BIP;
             if (cs->exception_index == EXCP_HW_BREAK) {
                 env->regs[16] = env->pc;
-                env->sregs[SR_MSR] |= MSR_BIP;
+                env->msr |= MSR_BIP;
                 env->pc = cpu->cfg.base_vectors + 0x18;
             } else
                 env->pc = env->btarget;
@@ -293,8 +292,8 @@ bool mb_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
     CPUMBState *env = &cpu->env;
 
     if ((interrupt_request & CPU_INTERRUPT_HARD)
-        && (env->sregs[SR_MSR] & MSR_IE)
-        && !(env->sregs[SR_MSR] & (MSR_EIP | MSR_BIP))
+        && (env->msr & MSR_IE)
+        && !(env->msr & (MSR_EIP | MSR_BIP))
         && !(env->iflags & (D_FLAG | IMM_FLAG))) {
         cs->exception_index = EXCP_IRQ;
         mb_cpu_do_interrupt(cs);
diff --git a/target/microblaze/op_helper.c b/target/microblaze/op_helper.c
index 2deef32740..3668382d36 100644
--- a/target/microblaze/op_helper.c
+++ b/target/microblaze/op_helper.c
@@ -78,14 +78,14 @@ void helper_debug(CPUMBState *env)
     qemu_log("PC=%" PRIx64 "\n", env->pc);
     qemu_log("rmsr=%" PRIx64 " resr=%" PRIx64 " rear=%" PRIx64 " "
              "debug[%x] imm=%x iflags=%x\n",
-             env->sregs[SR_MSR], env->sregs[SR_ESR], env->sregs[SR_EAR],
+             env->msr, env->sregs[SR_ESR], env->sregs[SR_EAR],
              env->debug, env->imm, env->iflags);
     qemu_log("btaken=%d btarget=%" PRIx64 " mode=%s(saved=%s) eip=%d ie=%d\n",
              env->btaken, env->btarget,
-             (env->sregs[SR_MSR] & MSR_UM) ? "user" : "kernel",
-             (env->sregs[SR_MSR] & MSR_UMS) ? "user" : "kernel",
-             (bool)(env->sregs[SR_MSR] & MSR_EIP),
-             (bool)(env->sregs[SR_MSR] & MSR_IE));
+             (env->msr & MSR_UM) ? "user" : "kernel",
+             (env->msr & MSR_UMS) ? "user" : "kernel",
+             (bool)(env->msr & MSR_EIP),
+             (bool)(env->msr & MSR_IE));
     for (i = 0; i < 32; i++) {
         qemu_log("r%2.2d=%8.8x ", i, env->regs[i]);
         if ((i + 1) % 4 == 0)
@@ -135,15 +135,15 @@ static inline int div_prepare(CPUMBState *env, uint32_t a, uint32_t b)
     MicroBlazeCPU *cpu = env_archcpu(env);
 
     if (b == 0) {
-        env->sregs[SR_MSR] |= MSR_DZ;
+        env->msr |= MSR_DZ;
 
-        if ((env->sregs[SR_MSR] & MSR_EE) && cpu->cfg.div_zero_exception) {
+        if ((env->msr & MSR_EE) && cpu->cfg.div_zero_exception) {
             env->sregs[SR_ESR] = ESR_EC_DIVZERO;
             helper_raise_exception(env, EXCP_HW_EXCP);
         }
         return 0;
     }
-    env->sregs[SR_MSR] &= ~MSR_DZ;
+    env->msr &= ~MSR_DZ;
     return 1;
 }
 
@@ -192,7 +192,7 @@ static void update_fpu_flags(CPUMBState *env, int flags)
     }
     if (raise
         && (env->pvr.regs[2] & PVR2_FPU_EXC_MASK)
-        && (env->sregs[SR_MSR] & MSR_EE)) {
+        && (env->msr & MSR_EE)) {
         raise_fpu_exception(env);
     }
 }
@@ -437,7 +437,7 @@ void helper_memalign(CPUMBState *env, target_ulong addr,
             if (mask == 3) {
                 env->sregs[SR_ESR] |= 1 << 11;
             }
-            if (!(env->sregs[SR_MSR] & MSR_EE)) {
+            if (!(env->msr & MSR_EE)) {
                 return;
             }
             helper_raise_exception(env, EXCP_HW_EXCP);
@@ -484,7 +484,7 @@ void mb_cpu_transaction_failed(CPUState *cs, hwaddr physaddr, vaddr addr,
     env = &cpu->env;
 
     cpu_restore_state(cs, retaddr, true);
-    if (!(env->sregs[SR_MSR] & MSR_EE)) {
+    if (!(env->msr & MSR_EE)) {
         return;
     }
 
diff --git a/target/microblaze/translate.c b/target/microblaze/translate.c
index 9f6815cc1f..9f2dcd82cd 100644
--- a/target/microblaze/translate.c
+++ b/target/microblaze/translate.c
@@ -1809,16 +1809,16 @@ void mb_cpu_dump_state(CPUState *cs, FILE *f, int flags)
     qemu_fprintf(f, "rmsr=%" PRIx64 " resr=%" PRIx64 " rear=%" PRIx64 " "
                  "debug=%x imm=%x iflags=%x fsr=%" PRIx64 " "
                  "rbtr=%" PRIx64 "\n",
-                 env->sregs[SR_MSR], env->sregs[SR_ESR], env->sregs[SR_EAR],
+                 env->msr, env->sregs[SR_ESR], env->sregs[SR_EAR],
                  env->debug, env->imm, env->iflags, env->sregs[SR_FSR],
                  env->sregs[SR_BTR]);
     qemu_fprintf(f, "btaken=%d btarget=%" PRIx64 " mode=%s(saved=%s) "
                  "eip=%d ie=%d\n",
                  env->btaken, env->btarget,
-                 (env->sregs[SR_MSR] & MSR_UM) ? "user" : "kernel",
-                 (env->sregs[SR_MSR] & MSR_UMS) ? "user" : "kernel",
-                 (bool)(env->sregs[SR_MSR] & MSR_EIP),
-                 (bool)(env->sregs[SR_MSR] & MSR_IE));
+                 (env->msr & MSR_UM) ? "user" : "kernel",
+                 (env->msr & MSR_UMS) ? "user" : "kernel",
+                 (bool)(env->msr & MSR_EIP),
+                 (bool)(env->msr & MSR_IE));
     for (i = 0; i < 12; i++) {
         qemu_fprintf(f, "rpvr%2.2d=%8.8x ", i, env->pvr.regs[i]);
         if ((i + 1) % 4 == 0) {
@@ -1871,8 +1871,10 @@ void mb_tcg_init(void)
 
     cpu_SR[SR_PC] =
         tcg_global_mem_new_i64(cpu_env, offsetof(CPUMBState, pc), "rpc");
+    cpu_SR[SR_MSR] =
+        tcg_global_mem_new_i64(cpu_env, offsetof(CPUMBState, msr), "rmsr");
 
-    for (i = 1; i < ARRAY_SIZE(cpu_SR); i++) {
+    for (i = SR_MSR + 1; i < ARRAY_SIZE(cpu_SR); i++) {
         cpu_SR[i] = tcg_global_mem_new_i64(cpu_env,
                           offsetof(CPUMBState, sregs[i]),
                           special_regnames[i]);