target/arm: Implement SCR_EL2.EEL2

This adds handling for the SCR_EL3.EEL2 bit.

Signed-off-by: Rémi Denis-Courmont <remi.denis.courmont@huawei.com>
Message-id: 20210112104511.36576-17-remi.denis.courmont@huawei.com
[PMM: Applied fixes for review issues noted by RTH:
 - check for FEATURE_AARCH64 before checking sel2 isar feature
 - correct the commit message subject line]
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

4 files changed, 36 insertions, 8 deletions

diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index 4ae22b2086..40142ac141 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -480,7 +480,7 @@ static inline bool arm_excp_unmasked(CPUState *cs, unsigned int excp_idx,
              * masked from Secure state. The HCR and SCR settings
              * don't affect the masking logic, only the interrupt routing.
              */
-            if (target_el == 3 || !secure) {
+            if (target_el == 3 || !secure || (env->cp15.scr_el3 & SCR_EEL2)) {
                 unmasked = true;
             }
         } else {
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index b115da5935..df0d677833 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -2164,7 +2164,10 @@ static inline bool arm_is_secure(CPUARMState *env)
 static inline bool arm_is_el2_enabled(CPUARMState *env)
 {
     if (arm_feature(env, ARM_FEATURE_EL2)) {
-        return !arm_is_secure_below_el3(env);
+        if (arm_is_secure_below_el3(env)) {
+            return (env->cp15.scr_el3 & SCR_EEL2) != 0;
+        }
+        return true;
     }
     return false;
 }
@@ -2211,7 +2214,8 @@ static inline bool arm_el_is_aa64(CPUARMState *env, int el)
         return aa64;
     }
 
-    if (arm_feature(env, ARM_FEATURE_EL3)) {
+    if (arm_feature(env, ARM_FEATURE_EL3) &&
+        ((env->cp15.scr_el3 & SCR_NS) || !(env->cp15.scr_el3 & SCR_EEL2))) {
         aa64 = aa64 && (env->cp15.scr_el3 & SCR_RW);
     }
 
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 79164a03e0..f3ee6d9808 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -533,6 +533,9 @@ static CPAccessResult access_trap_aa32s_el1(CPUARMState *env,
         return CP_ACCESS_OK;
     }
     if (arm_is_secure_below_el3(env)) {
+        if (env->cp15.scr_el3 & SCR_EEL2) {
+            return CP_ACCESS_TRAP_EL2;
+        }
         return CP_ACCESS_TRAP_EL3;
     }
     /* This will be EL1 NS and EL2 NS, which just UNDEF */
@@ -2030,6 +2033,9 @@ static void scr_write(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t value)
         if (cpu_isar_feature(aa64_pauth, cpu)) {
             valid_mask |= SCR_API | SCR_APK;
         }
+        if (cpu_isar_feature(aa64_sel2, cpu)) {
+            valid_mask |= SCR_EEL2;
+        }
         if (cpu_isar_feature(aa64_mte, cpu)) {
             valid_mask |= SCR_ATA;
         }
@@ -3388,13 +3394,16 @@ static CPAccessResult ats_access(CPUARMState *env, const ARMCPRegInfo *ri,
                                  bool isread)
 {
     if (ri->opc2 & 4) {
-        /* The ATS12NSO* operations must trap to EL3 if executed in
+        /* The ATS12NSO* operations must trap to EL3 or EL2 if executed in
          * Secure EL1 (which can only happen if EL3 is AArch64).
          * They are simply UNDEF if executed from NS EL1.
          * They function normally from EL2 or EL3.
          */
         if (arm_current_el(env) == 1) {
             if (arm_is_secure_below_el3(env)) {
+                if (env->cp15.scr_el3 & SCR_EEL2) {
+                    return CP_ACCESS_TRAP_UNCATEGORIZED_EL2;
+                }
                 return CP_ACCESS_TRAP_UNCATEGORIZED_EL3;
             }
             return CP_ACCESS_TRAP_UNCATEGORIZED;
@@ -3657,7 +3666,8 @@ static void ats1h_write(CPUARMState *env, const ARMCPRegInfo *ri,
 static CPAccessResult at_s1e2_access(CPUARMState *env, const ARMCPRegInfo *ri,
                                      bool isread)
 {
-    if (arm_current_el(env) == 3 && !(env->cp15.scr_el3 & SCR_NS)) {
+    if (arm_current_el(env) == 3 &&
+        !(env->cp15.scr_el3 & (SCR_NS | SCR_EEL2))) {
         return CP_ACCESS_TRAP;
     }
     return CP_ACCESS_OK;
@@ -5756,12 +5766,15 @@ static CPAccessResult nsacr_access(CPUARMState *env, const ARMCPRegInfo *ri,
                                    bool isread)
 {
     /* The NSACR is RW at EL3, and RO for NS EL1 and NS EL2.
-     * At Secure EL1 it traps to EL3.
+     * At Secure EL1 it traps to EL3 or EL2.
      */
     if (arm_current_el(env) == 3) {
         return CP_ACCESS_OK;
     }
     if (arm_is_secure_below_el3(env)) {
+        if (env->cp15.scr_el3 & SCR_EEL2) {
+            return CP_ACCESS_TRAP_EL2;
+        }
         return CP_ACCESS_TRAP_EL3;
     }
     /* Accesses from EL1 NS and EL2 NS are UNDEF for write but allow reads. */
diff --git a/target/arm/translate.c b/target/arm/translate.c
index 614a6853ca..1653cca1aa 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -2832,9 +2832,20 @@ static bool msr_banked_access_decode(DisasContext *s, int r, int sysm, int rn,
         }
         if (s->current_el == 1) {
             /* If we're in Secure EL1 (which implies that EL3 is AArch64)
-             * then accesses to Mon registers trap to EL3
+             * then accesses to Mon registers trap to Secure EL2, if it exists,
+             * otherwise EL3.
              */
-            TCGv_i32 tcg_el = tcg_const_i32(3);
+            TCGv_i32 tcg_el;
+
+            if (arm_dc_feature(s, ARM_FEATURE_AARCH64) &&
+                dc_isar_feature(aa64_sel2, s)) {
+                /* Target EL is EL<3 minus SCR_EL3.EEL2> */
+                tcg_el = load_cpu_field(cp15.scr_el3);
+                tcg_gen_sextract_i32(tcg_el, tcg_el, ctz32(SCR_EEL2), 1);
+                tcg_gen_addi_i32(tcg_el, tcg_el, 3);
+            } else {
+                tcg_el = tcg_const_i32(3);
+            }
 
             gen_exception_el(s, EXCP_UDEF, syn_uncategorized(), tcg_el);
             tcg_temp_free_i32(tcg_el);