From fd582a1cbd091576701d12e886d9ad91527320f9 Mon Sep 17 00:00:00 2001
From: David Li <li.davidm96@gmail.com>
Date: Fri, 18 Dec 2015 21:20:36 -0500
Subject: Implement RV32I integer-register instructions

---
 src/isa/funct3.rs  | 14 ++++++++++++++
 src/isa/funct7.rs  |  2 ++
 src/isa/mod.rs     | 17 +++++++++++++++++
 src/isa/opcodes.rs |  6 +++++-
 4 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 src/isa/funct7.rs

(limited to 'src/isa')

diff --git a/src/isa/funct3.rs b/src/isa/funct3.rs
index d9a626a..0612844 100644
--- a/src/isa/funct3.rs
+++ b/src/isa/funct3.rs
@@ -2,6 +2,20 @@ pub const ADDI: u32 = 0x0;
 pub const SLLI: u32 = 0x1;
 pub const SLTI: u32 = 0x2;
 pub const SLTIU: u32 = 0x3;
+pub const XORI: u32 = 0x4;
+pub const SRLI: u32 = 0x5;
+pub const SRAI: u32 = 0x5;
+pub const ORI: u32 = 0x6;
+pub const ANDI: u32 = 0x7;
+
+pub const ADD_SUB: u32 = 0x0;
+pub const SLL: u32 = 0x1;
+pub const SLT: u32 = 0x2;
+pub const SLTU: u32 = 0x3;
+pub const XOR: u32 = 0x4;
+pub const SRL_SRA: u32 = 0x5;
+pub const OR: u32 = 0x6;
+pub const AND: u32 = 0x7;
 
 pub const LW: u32 = 0x2;
 
diff --git a/src/isa/funct7.rs b/src/isa/funct7.rs
new file mode 100644
index 0000000..f3446fb
--- /dev/null
+++ b/src/isa/funct7.rs
@@ -0,0 +1,2 @@
+pub const ADD_SRL: u32 = 0x0;
+pub const SUB_SRA: u32 = 0x1;
diff --git a/src/isa/mod.rs b/src/isa/mod.rs
index b34d701..ebfd4e8 100644
--- a/src/isa/mod.rs
+++ b/src/isa/mod.rs
@@ -1,5 +1,6 @@
 pub mod opcodes;
 pub mod funct3;
+pub mod funct7;
 
 #[derive(Debug, PartialEq)]
 pub enum Register {
@@ -81,6 +82,7 @@ impl Register {
     }
 }
 
+#[derive(Copy, Clone, Debug)]
 pub struct Instruction {
     word: u32,
 }
@@ -104,11 +106,26 @@ impl Instruction {
         (self.word >> 12) & 0x3
     }
 
+    pub fn funct7(&self) -> u32 {
+        (self.word >> 25) & 0x7F
+    }
+
     pub fn rs1(&self) -> Register {
         Register::from_num((self.word >> 15) & 0x1F)
     }
 
+    pub fn rs2(&self) -> Register {
+        Register::from_num((self.word >> 20) & 0x1F)
+    }
+
     pub fn i_imm(&self) -> i32 {
         (self.word as i32) >> 20
     }
+
+    pub fn s_imm(&self) -> i32 {
+        let word = self.word as i32;
+        let low = (word >> 7) & 0x1F;
+        let high = (word >> 25) & 0x7F;
+        (high << 7) | low
+    }
 }
diff --git a/src/isa/opcodes.rs b/src/isa/opcodes.rs
index 33af0f6..e5763e3 100644
--- a/src/isa/opcodes.rs
+++ b/src/isa/opcodes.rs
@@ -1,4 +1,8 @@
-pub const BRANCH: u32 = 0x12;
+pub const BRANCH: u32 = 0x63;
+pub const JALR: u32 = 0x67;
+pub const JAL: u32 = 0x68;
 pub const INTEGER_IMMEDIATE: u32 = 0x13;
+pub const INTEGER_REGISTER: u32 = 0x33;
 pub const LOAD: u32 = 0x3;
 pub const STORE: u32 = 0x23;
+pub const SYSTEM: u32 = 0x73;
-- 
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