arm: Add support for armv8 CRC32 instructions

This patch introduces the ARM A32/T32/A64 CRC Instructions, which are
mandatory since ARMv8.1. The UNPREDICTABLE behaviours are implemented as
follows:
1) CRC32(C)X (64 bit) instructions are decoded as Undefined in Aarch32
2) The instructions support predication in Aarch32
3) Using R15(PC) as source/dest operand is permitted in Aarch32

Change-Id: Iaf29b05874e1370c7615da79a07f111ded17b6cc
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-by: Giacomo Gabrielli <giacomo.gabrielli@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/5521
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/src/arch/arm/isa/formats/aarch64.isa b/src/arch/arm/isa/formats/aarch64.isa
index 38e5b15a0..2c33e2441 100644
--- a/src/arch/arm/isa/formats/aarch64.isa
+++ b/src/arch/arm/isa/formats/aarch64.isa
@@ -1202,6 +1202,22 @@ namespace Aarch64
                         return new Asrv64(machInst, rdzr, rn, rm);
                       case 0xb:
                         return new Rorv64(machInst, rdzr, rn, rm);
+                      case 0x10:
+                        return new Crc32b64(machInst, rdzr, rn, rm);
+                      case 0x11:
+                        return new Crc32h64(machInst, rdzr, rn, rm);
+                      case 0x12:
+                        return new Crc32w64(machInst, rdzr, rn, rm);
+                      case 0x13:
+                        return new Crc32x64(machInst, rdzr, rn, rm);
+                      case 0x14:
+                        return new Crc32cb64(machInst, rdzr, rn, rm);
+                      case 0x15:
+                        return new Crc32ch64(machInst, rdzr, rn, rm);
+                      case 0x16:
+                        return new Crc32cw64(machInst, rdzr, rn, rm);
+                      case 0x17:
+                        return new Crc32cx64(machInst, rdzr, rn, rm);
                       default:
                         return new Unknown64(machInst);
                     }