arm: Add support for ARMv8 (AArch64 & AArch32)

Note: AArch64 and AArch32 interworking is not supported. If you use an AArch64
kernel you are restricted to AArch64 user-mode binaries. This will be addressed
in a later patch.

Note: Virtualization is only supported in AArch32 mode. This will also be fixed
in a later patch.

Contributors:
Giacomo Gabrielli    (TrustZone, LPAE, system-level AArch64, AArch64 NEON, validation)
Thomas Grocutt       (AArch32 Virtualization, AArch64 FP, validation)
Mbou Eyole           (AArch64 NEON, validation)
Ali Saidi            (AArch64 Linux support, code integration, validation)
Edmund Grimley-Evans (AArch64 FP)
William Wang         (AArch64 Linux support)
Rene De Jong         (AArch64 Linux support, performance opt.)
Matt Horsnell        (AArch64 MP, validation)
Matt Evans           (device models, code integration, validation)
Chris Adeniyi-Jones  (AArch64 syscall-emulation)
Prakash Ramrakhyani  (validation)
Dam Sunwoo           (validation)
Chander Sudanthi     (validation)
Stephan Diestelhorst (validation)
Andreas Hansson      (code integration, performance opt.)
Eric Van Hensbergen  (performance opt.)
Gabe Black

1 files changed, 18 insertions, 3 deletions

diff --git a/src/arch/arm/decoder.cc b/src/arch/arm/decoder.cc
index e957ce0e7..940d85b8e 100644
--- a/src/arch/arm/decoder.cc
+++ b/src/arch/arm/decoder.cc
@@ -1,4 +1,16 @@
 /*
+ * Copyright (c) 2012-2013 ARM Limited
+ * All rights reserved
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder.  You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
  * Copyright (c) 2012 Google
  * All rights reserved.
  *
@@ -47,9 +59,11 @@ Decoder::process()
 
     if (!emi.thumb) {
         emi.instBits = data;
-        emi.sevenAndFour = bits(data, 7) && bits(data, 4);
-        emi.isMisc = (bits(data, 24, 23) == 0x2 &&
-                      bits(data, 20) == 0);
+        if (!emi.aarch64) {
+            emi.sevenAndFour = bits(data, 7) && bits(data, 4);
+            emi.isMisc = (bits(data, 24, 23) == 0x2 &&
+                          bits(data, 20) == 0);
+        }
         consumeBytes(4);
         DPRINTF(Decoder, "Arm inst: %#x.\n", (uint64_t)emi);
     } else {
@@ -112,6 +126,7 @@ Decoder::moreBytes(const PCState &pc, Addr fetchPC, MachInst inst)
     data = inst;
     offset = (fetchPC >= pc.instAddr()) ? 0 : pc.instAddr() - fetchPC;
     emi.thumb = pc.thumb();
+    emi.aarch64 = pc.aarch64();
     emi.fpscrLen = fpscrLen;
     emi.fpscrStride = fpscrStride;