From 309492a16167fc1cad65050ec5080c3a943bc629 Mon Sep 17 00:00:00 2001
From: Ekaitz Zarraga <ekaitz@elenq.tech>
Date: Mon, 24 May 2021 20:45:04 +0200
Subject: Add RV64I instruction support

---
 pysc-v/InstructionSets/RV64I.py | 63 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 pysc-v/InstructionSets/RV64I.py

diff --git a/pysc-v/InstructionSets/RV64I.py b/pysc-v/InstructionSets/RV64I.py
new file mode 100644
index 0000000..72b8bcb
--- /dev/null
+++ b/pysc-v/InstructionSets/RV64I.py
@@ -0,0 +1,63 @@
+from .instructions import Instruction, InstructionSet
+from ctypes import c_uint32
+from .RV32I import *
+
+RV64I = InstructionSet()
+
+class ShiftImm64(ShiftImm):
+    # NOTE: This is an special type used for shifting operations because they
+    # have 7 bits left after the maximum shift (5bits -> 32 rotations)
+    # they can apply.
+    # In RV64I they can indicate rotation with 1 bit more (64 rotations) so
+    # they use a funct6 instead.
+    funct6 = None
+    funct3 = None
+    opcode = None
+
+    def __init__(self, rd, rs, imm):
+        self.rd  = rd
+        self.rs  = rs
+        self.imm = imm
+
+    def compile(self):
+        return c_uint32(
+            (self.funct6 << 26) +\
+            (self.imm    << 20) +\
+            (self.rs     << 15) +\
+            (self.funct3 << 12) +\
+            (self.rd     <<  7) +\
+            self.opcode
+        )
+
+@RV64I.instruction
+class slli(ShiftImm64):
+    name    = "slli"
+    opcode  = 0b0010011
+    funct3  = 0b001
+    funct6  = 0b000000
+
+@RV64I.instruction
+class srli(ShiftImm64):
+    name    = "srli"
+    opcode  = 0b0010011
+    funct3  = 0b101
+    funct6  = 0b000000
+
+@RV64I.instruction
+class srai(ShiftImm64):
+    name    = "srai"
+    opcode  = 0b0010011
+    funct3  = 0b101
+    funct6  = 0b010000
+
+@RV64I.instruction
+class sd(S):
+    name    = "sd"
+    opcode  = 0b0100011
+    funct3  = 0b011
+
+@RV64I.instruction
+class ld(I):
+    name    = "ld"
+    opcode  = 0b0000011
+    funct3  = 0b011
-- 
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