target-arm: Implement AArch64 CurrentEL sysreg

Implement the CurrentEL sysreg.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c
index 8752e7e16c..ec2d9dc219 100644
--- a/target-arm/translate-a64.c
+++ b/target-arm/translate-a64.c
@@ -1231,6 +1231,13 @@ static void handle_sys(DisasContext *s, uint32_t insn, bool isread,
             gen_set_nzcv(tcg_rt);
         }
         return;
+    case ARM_CP_CURRENTEL:
+        /* Reads as current EL value from pstate, which is
+         * guaranteed to be constant by the tb flags.
+         */
+        tcg_rt = cpu_reg(s, rt);
+        tcg_gen_movi_i64(tcg_rt, s->current_pl << 2);
+        return;
     default:
         break;
     }