target/mips: Introduce ase_msa_available() helper

Instead of accessing CP0_Config3 directly and checking
the 'MSA Present' bit, introduce an explicit helper,
making the code easier to read.

Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Message-Id: <20201208003702.4088927-2-f4bug@amsat.org>

4 files changed, 15 insertions, 11 deletions

diff --git a/target/mips/cpu.c b/target/mips/cpu.c
index f3bf0466a4..0643a5784c 100644
--- a/target/mips/cpu.c
+++ b/target/mips/cpu.c
@@ -533,7 +533,7 @@ static void mips_cpu_reset(DeviceState *dev)
     }
 
     /* MSA */
-    if (env->CP0_Config3 & (1 << CP0C3_MSAP)) {
+    if (ase_msa_available(env)) {
         msa_reset(env);
     }
 
diff --git a/target/mips/cpu.h b/target/mips/cpu.h
index 9c45744c5c..b9e227a30e 100644
--- a/target/mips/cpu.h
+++ b/target/mips/cpu.h
@@ -1299,6 +1299,12 @@ bool cpu_type_supports_cps_smp(const char *cpu_type);
 bool cpu_supports_isa(const CPUMIPSState *env, uint64_t isa_mask);
 bool cpu_type_supports_isa(const char *cpu_type, uint64_t isa);
 
+/* Check presence of MSA implementation */
+static inline bool ase_msa_available(CPUMIPSState *env)
+{
+    return env->CP0_Config3 & (1 << CP0C3_MSAP);
+}
+
 /* Check presence of multi-threading ASE implementation */
 static inline bool ase_mt_available(CPUMIPSState *env)
 {
diff --git a/target/mips/kvm.c b/target/mips/kvm.c
index a5b6fe35db..84fb10ea35 100644
--- a/target/mips/kvm.c
+++ b/target/mips/kvm.c
@@ -79,7 +79,7 @@ int kvm_arch_init_vcpu(CPUState *cs)
         }
     }
 
-    if (kvm_mips_msa_cap && env->CP0_Config3 & (1 << CP0C3_MSAP)) {
+    if (kvm_mips_msa_cap && ase_msa_available(env)) {
         ret = kvm_vcpu_enable_cap(cs, KVM_CAP_MIPS_MSA, 0, 0);
         if (ret < 0) {
             /* mark unsupported so it gets disabled on reset */
@@ -105,7 +105,7 @@ void kvm_mips_reset_vcpu(MIPSCPU *cpu)
         warn_report("KVM does not support FPU, disabling");
         env->CP0_Config1 &= ~(1 << CP0C1_FP);
     }
-    if (!kvm_mips_msa_cap && env->CP0_Config3 & (1 << CP0C3_MSAP)) {
+    if (!kvm_mips_msa_cap && ase_msa_available(env)) {
         warn_report("KVM does not support MSA, disabling");
         env->CP0_Config3 &= ~(1 << CP0C3_MSAP);
     }
@@ -618,7 +618,7 @@ static int kvm_mips_put_fpu_registers(CPUState *cs, int level)
          * FPU register state is a subset of MSA vector state, so don't put FPU
          * registers if we're emulating a CPU with MSA.
          */
-        if (!(env->CP0_Config3 & (1 << CP0C3_MSAP))) {
+        if (!ase_msa_available(env)) {
             /* Floating point registers */
             for (i = 0; i < 32; ++i) {
                 if (env->CP0_Status & (1 << CP0St_FR)) {
@@ -637,7 +637,7 @@ static int kvm_mips_put_fpu_registers(CPUState *cs, int level)
     }
 
     /* Only put MSA state if we're emulating a CPU with MSA */
-    if (env->CP0_Config3 & (1 << CP0C3_MSAP)) {
+    if (ase_msa_available(env)) {
         /* MSA Control Registers */
         if (level == KVM_PUT_FULL_STATE) {
             err = kvm_mips_put_one_reg(cs, KVM_REG_MIPS_MSA_IR,
@@ -698,7 +698,7 @@ static int kvm_mips_get_fpu_registers(CPUState *cs)
          * FPU register state is a subset of MSA vector state, so don't save FPU
          * registers if we're emulating a CPU with MSA.
          */
-        if (!(env->CP0_Config3 & (1 << CP0C3_MSAP))) {
+        if (!ase_msa_available(env)) {
             /* Floating point registers */
             for (i = 0; i < 32; ++i) {
                 if (env->CP0_Status & (1 << CP0St_FR)) {
@@ -717,7 +717,7 @@ static int kvm_mips_get_fpu_registers(CPUState *cs)
     }
 
     /* Only get MSA state if we're emulating a CPU with MSA */
-    if (env->CP0_Config3 & (1 << CP0C3_MSAP)) {
+    if (ase_msa_available(env)) {
         /* MSA Control Registers */
         err = kvm_mips_get_one_reg(cs, KVM_REG_MIPS_MSA_IR,
                                    &env->msair);
diff --git a/target/mips/translate.c b/target/mips/translate.c
index 7e8afb363a..d87fbaf0ec 100644
--- a/target/mips/translate.c
+++ b/target/mips/translate.c
@@ -24919,8 +24919,7 @@ static void decode_opc_special(CPUMIPSState *env, DisasContext *ctx)
         gen_trap(ctx, op1, rs, rt, -1);
         break;
     case OPC_LSA: /* OPC_PMON */
-        if ((ctx->insn_flags & ISA_MIPS_R6) ||
-            (env->CP0_Config3 & (1 << CP0C3_MSAP))) {
+        if ((ctx->insn_flags & ISA_MIPS_R6) || ase_msa_available(env)) {
             decode_opc_special_r6(env, ctx);
         } else {
             /* Pmon entry point, also R4010 selsl */
@@ -25022,8 +25021,7 @@ static void decode_opc_special(CPUMIPSState *env, DisasContext *ctx)
         }
         break;
     case OPC_DLSA:
-        if ((ctx->insn_flags & ISA_MIPS_R6) ||
-            (env->CP0_Config3 & (1 << CP0C3_MSAP))) {
+        if ((ctx->insn_flags & ISA_MIPS_R6) || ase_msa_available(env)) {
             decode_opc_special_r6(env, ctx);
         }
         break;