1 files changed, 71 insertions, 0 deletions
diff --git a/pysc-v/InstructionSets/RV32I.py b/pysc-v/InstructionSets/RV32I.py
new file mode 100644
index 0000000..967b24d
--- /dev/null
+++ b/pysc-v/InstructionSets/RV32I.py
@@ -0,0 +1,71 @@
+from instructions import Instruction, InstructionSet
+
+RV32I = InstructionSet()
+
+class R(Instruction):
+    funct3  = None
+    funct7  = None
+    opcode  = None
+    def __init__(self, rd, rs1, rs2):
+        self.rd  = rd
+        self.rs1 = rs1
+        self.rs2 = rs2
+
+    def compile(self):
+        # TODO: ensure sizes and convert register names to number...
+        return c_uint32(
+            (self.funct7  << 25) +\
+            (self.rs2     << 20) +\
+            (self.rs1     << 15) +\
+            (self.funct3  << 12) +\
+            (self.rd      <<  7) +\
+            self.opcode
+        )
+
+class I(Instruction):
+    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.imm    << 20) +\
+            (self.rs     << 15) +\
+            (self.funct3 << 12) +\
+            (self.rd     <<  7) +\
+            self.opcode
+        )
+
+class S(Instruction):
+    pass
+
+class B(Instruction):
+    pass
+
+class U(Instruction):
+    pass
+
+class J(Instruction):
+    pass
+
+
+class add(R):
+    name    = "add"
+    opcode  = 0b0110011
+    funct3  = 0b000
+    funct7  = 0b0000000
+
+    def execute(self):
+        return pc + self.size
+
+class addi(I):
+    name    = "addi"
+    opcode  = 0b0010011
+    funct3  = 0b000
+
+    def execute(self):
+        pass