target-arm: Implement AArch64 SCTLR_EL1

Implement the AArch64 view of the system control register SCTLR_EL1.

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

target-arm/cpu.h

diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 51fa634..74b1122 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -169,7 +169,7 @@
     struct {
         uint32_t c0_cpuid;
         uint64_t c0_cssel; /* Cache size selection.  */
-        uint32_t c1_sys; /* System control register.  */
+        uint64_t c1_sys; /* System control register.  */
         uint32_t c1_coproc; /* Coprocessor access register.  */
         uint32_t c1_xscaleauxcr; /* XScale auxiliary control register.  */
         uint32_t c1_scr; /* secure config register.  */

target-arm/helper.c

diff --git a/target-arm/helper.c b/target-arm/helper.c
index e230a18..630ace9 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -1948,7 +1948,8 @@
     /* Generic registers whose values depend on the implementation */
     {
         ARMCPRegInfo sctlr = {
-            .name = "SCTLR", .cp = 15, .crn = 1, .crm = 0, .opc1 = 0, .opc2 = 0,
+            .name = "SCTLR", .state = ARM_CP_STATE_BOTH,
+            .opc0 = 3, .crn = 1, .crm = 0, .opc1 = 0, .opc2 = 0,
             .access = PL1_RW, .fieldoffset = offsetof(CPUARMState, cp15.c1_sys),
             .writefn = sctlr_write, .resetvalue = cpu->reset_sctlr,
             .raw_writefn = raw_write,