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authorGiacomo Travaglini <giacomo.travaglini@arm.com>2017-10-13 10:03:14 +0100
committerAndreas Sandberg <andreas.sandberg@arm.com>2017-11-15 14:11:44 +0000
commitef0490081fa7ebcda2e1c7adccb05b3a14014cf1 (patch)
tree8073449559fecaf9bc1fb8f280a50a30a9313863 /src/arch/arm/isa/formats/data.isa
parentf0f04ddd70aa3260f5282227de264653ac36fabe (diff)
downloadgem5-ef0490081fa7ebcda2e1c7adccb05b3a14014cf1.tar.xz
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>
Diffstat (limited to 'src/arch/arm/isa/formats/data.isa')
-rw-r--r--src/arch/arm/isa/formats/data.isa25
1 files changed, 23 insertions, 2 deletions
diff --git a/src/arch/arm/isa/formats/data.isa b/src/arch/arm/isa/formats/data.isa
index 3ee178f0e..909a52593 100644
--- a/src/arch/arm/isa/formats/data.isa
+++ b/src/arch/arm/isa/formats/data.isa
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 ARM Limited
+// Copyright (c) 2010,2017 ARM Limited
// All rights reserved
//
// The license below extends only to copyright in the software and shall
@@ -788,7 +788,7 @@ def format Thumb32DataProcReg() {{
}
}
} else if (bits(op1, 3, 2) == 0x2 && bits(op2, 3, 2) == 0x2) {
- const uint32_t op1 = bits(machInst, 21, 20);
+ const uint32_t op1 = bits(machInst, 22, 20);
const uint32_t op2 = bits(machInst, 5, 4);
const IntRegIndex rd =
(IntRegIndex)(uint32_t)bits(machInst, 11, 8);
@@ -832,6 +832,27 @@ def format Thumb32DataProcReg() {{
if (op2 == 0) {
return new Clz(machInst, rd, rm);
}
+ break;
+ case 0x4:
+ switch (op2) {
+ case 0x0:
+ return new Crc32b(machInst, rd, rn, rm);
+ case 0x1:
+ return new Crc32h(machInst, rd, rn, rm);
+ case 0x2:
+ return new Crc32w(machInst, rd, rn, rm);
+ }
+ break;
+ case 0x5:
+ switch (op2) {
+ case 0x0:
+ return new Crc32cb(machInst, rd, rn, rm);
+ case 0x1:
+ return new Crc32ch(machInst, rd, rn, rm);
+ case 0x2:
+ return new Crc32cw(machInst, rd, rn, rm);
+ }
+ break;
}
}
return new Unknown(machInst);