target/arm: Adjust aarch64_cpu_dump_state for system mode SVE

Use the existing helpers to determine if (1) the fpu is enabled,
(2) sve state is enabled, and (3) the current sve vector length.
Tested-by: NLaurent Desnogues <laurent.desnogues@gmail.com>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>
Message-id: 20181005175350.30752-6-richard.henderson@linaro.org
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

target/arm/cpu.h

@@ -920,6 +920,10 @@ target_ulong do_arm_semihosting(CPUARMState *env);
 void aarch64_sync_32_to_64(CPUARMState *env);
 void aarch64_sync_64_to_32(CPUARMState *env);
 
+int fp_exception_el(CPUARMState *env, int cur_el);
+int sve_exception_el(CPUARMState *env, int cur_el);
+uint32_t sve_zcr_len_for_el(CPUARMState *env, int el);
+
 static inline bool is_a64(CPUARMState *env)
 {
     return env->aarch64;

target/arm/helper.c

@@ -4406,7 +4406,7 @@ static const ARMCPRegInfo debug_lpae_cp_reginfo[] = {
  * take care of raising that exception.
  * C.f. the ARM pseudocode function CheckSVEEnabled.
  */
-static int sve_exception_el(CPUARMState *env, int el)
+int sve_exception_el(CPUARMState *env, int el)
 {
 #ifndef CONFIG_USER_ONLY
     if (el <= 1) {
@@ -4464,7 +4464,7 @@ static int sve_exception_el(CPUARMState *env, int el)
 /*
  * Given that SVE is enabled, return the vector length for EL.
  */
-static uint32_t sve_zcr_len_for_el(CPUARMState *env, int el)
+uint32_t sve_zcr_len_for_el(CPUARMState *env, int el)
 {
     ARMCPU *cpu = arm_env_get_cpu(env);
     uint32_t zcr_len = cpu->sve_max_vq - 1;
@@ -12546,7 +12546,7 @@ uint32_t HELPER(crc32c)(uint32_t acc, uint32_t val, uint32_t bytes)
 /* Return the exception level to which FP-disabled exceptions should
  * be taken, or 0 if FP is enabled.
  */
-static int fp_exception_el(CPUARMState *env, int cur_el)
+int fp_exception_el(CPUARMState *env, int cur_el)
 {
 #ifndef CONFIG_USER_ONLY
     int fpen;

target/arm/translate-a64.c

@@ -166,11 +166,15 @@ void aarch64_cpu_dump_state(CPUState *cs, FILE *f,
         cpu_fprintf(f, "\n");
         return;
     }
+    if (fp_exception_el(env, el) != 0) {
+        cpu_fprintf(f, "    FPU disabled\n");
+        return;
+    }
     cpu_fprintf(f, "     FPCR=%08x FPSR=%08x\n",
                 vfp_get_fpcr(env), vfp_get_fpsr(env));
 
-    if (arm_feature(env, ARM_FEATURE_SVE)) {
-        int j, zcr_len = env->vfp.zcr_el[1] & 0xf; /* fix for system mode */
+    if (arm_feature(env, ARM_FEATURE_SVE) && sve_exception_el(env, el) == 0) {
+        int j, zcr_len = sve_zcr_len_for_el(env, el);
 
         for (i = 0; i <= FFR_PRED_NUM; i++) {
             bool eol;