[PATCH 2/3] target/arm: provide RAZ/WI stubs for more DCC registers

[Evgeny Iakovlev]

Qemu doesn't implement Debug Communication Channel, however when running
Microsoft Hyper-V in software-emulated ARM64 as a guest, it tries to
access some of the DCM registers during an EL2 context switch.

Provide RAZ/WI stubs for OSDTRRX_EL1, OSDTRTX_EL1 and OSECCR_EL1
registers in the same way the rest of DCM is currently done. Do
account for access traps though with access_tda.

Signed-off-by: Evgeny Iakovlev <eiakovlev@linux.microsoft.com>
---
 target/arm/debug_helper.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/target/arm/debug_helper.c b/target/arm/debug_helper.c
index b244e146e2..2a7c3d7e38 100644
--- a/target/arm/debug_helper.c
+++ b/target/arm/debug_helper.c
@@ -673,6 +673,18 @@ static const ARMCPRegInfo debug_cp_reginfo[] = {
       .opc0 = 2, .opc1 = 3, .crn = 0, .crm = 1, .opc2 = 0,
       .access = PL0_R, .accessfn = access_tda,
       .type = ARM_CP_CONST, .resetvalue = 0 },
+    { .name = "OSDTRRX_EL1", .state = ARM_CP_STATE_BOTH, .cp = 14,
+      .opc0 = 2, .opc1 = 0, .crn = 0, .crm = 0, .opc2 = 2,
+      .access = PL1_RW, .accessfn = access_tda,
+      .type = ARM_CP_CONST, .resetvalue = 0 },
+    { .name = "OSDTRTX_EL1", .state = ARM_CP_STATE_BOTH, .cp = 14,
+      .opc0 = 2, .opc1 = 0, .crn = 0, .crm = 3, .opc2 = 2,
+      .access = PL1_RW, .accessfn = access_tda,
+      .type = ARM_CP_CONST, .resetvalue = 0 },
+    { .name = "OSECCR_EL1", .state = ARM_CP_STATE_BOTH, .cp = 14,
+      .opc0 = 2, .opc1 = 0, .crn = 0, .crm = 6, .opc2 = 2,
+      .access = PL1_RW, .accessfn = access_tda,
+      .type = ARM_CP_CONST, .resetvalue = 0 },
     /*
      * DBGDSCRint[15,12,5:2] map to MDSCR_EL1[15,12,5:2].  Map all bits as
      * it is unlikely a guest will care.
-- 
2.34.1