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+"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f" diff --git a/Cargo.toml b/Cargo.toml index 19be059..8ec4aeb 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -30,18 +30,25 @@ name = "mos6502" description = "A MOS 6502 Emulator" license = "BSD-3-Clause" -version = "0.0.1" +version = "0.1.0" authors = ["The 6502-rs Developers"] +build = "build.rs" [lib] # This will look in src/lib.rs name = "mos6502" -[[bin]] -# This will look in src/bin/mos6502.rs -name = "mos6502" - [dependencies] bitflags = "0.9.1" -log = "0.3.8" -num = "0.1" +log = "0.4.6" + +[dependencies.num] +version = "0.2" +# no_std support +default-features = false + +[build-dependencies] +skeptic = "0.13" + +[dev-dependencies] +skeptic = "0.13" diff --git a/README.md b/README.md index 88b84b4..83aed56 100644 --- a/README.md +++ b/README.md @@ -7,3 +7,111 @@ This started off as a fork of [6502-rs](https://github.com/amw-zero/6502-rs), which seems to be unmaintained at this point. It builds with the latest stable Rust. + +## Usage example + +```rust +extern crate mos6502; + +use mos6502::cpu; +use mos6502::address::Address; + +fn main() { + let mut cpu = cpu::CPU::new(); + + let zero_page_data = [ + // ZeroPage data start + 0x00, + 0x02, // ADC ZeroPage target + 0x00, + 0x04, // ADC ZeroPageX target + 0x00, + 0x00, + 0x00, + 0x00, + 0x10, // ADC IndexedIndirectX address + 0x80, // ADC IndexedIndirectX address + 0x00, + 0x00, + 0x00, + 0x00, + 0x00, + 0x08, // ADC IndirectIndexedY address + 0x80, // ADC IndirectIndexedY address + ]; + + let program = [ + // Code start + 0xA9, // LDA Immediate + 0x01, // Immediate operand + 0x69, // ADC Immediate + 0x07, // Immediate operand + 0x65, // ADC ZeroPage + 0x01, // ZeroPage operand + 0xA2, // LDX Immediate + 0x01, // Immediate operand + 0x75, // ADC ZeroPageX + 0x02, // ZeroPageX operand + 0x6D, // ADC Absolute + 0x01, // Absolute operand + 0x80, // Absolute operand + 0xA2, // LDX immediate + 0x08, // Immediate operand + 0x7D, // ADC AbsoluteX + 0x00, // AbsoluteX operand + 0x80, // AbsoluteX operand + 0xA0, // LDY immediate + 0x04, // Immediate operand + 0x79, // ADC AbsoluteY + 0x00, // AbsoluteY operand + 0x80, // AbsoluteY operand + 0xA2, // LDX immediate + 0x05, // Immediate operand + 0x61, // ADC IndexedIndirectX + 0x03, // IndexedIndirectX operand + 0xA0, // LDY immediate + 0x10, // Immediate operand + 0x71, // ADC IndirectIndexedY + 0x0F, // IndirectIndexedY operand + 0xEA, // NOP :) + 0xFF, // Something invalid -- the end! + ]; + + let data: [u8; 25] = [ + 0x00, + 0x09, // ADC Absolute target + 0x00, + 0x00, + 0x40, // ADC AbsoluteY target + 0x00, + 0x00, + 0x00, + 0x11, // ADC AbsoluteX target + 0x00, + 0x00, + 0x00, + 0x00, + 0x00, + 0x00, + 0x00, + 0x12, // ADC IndexedIndirectX target + 0x00, + 0x00, + 0x00, + 0x00, + 0x00, + 0x00, + 0x00, + 0x06, // ADC IndirectIndexedY target + ]; + + // "Load" a program + cpu.memory.set_bytes(Address(0x0000), &zero_page_data); + cpu.memory.set_bytes(Address(0x4000), &program); + cpu.memory.set_bytes(Address(0x8000), &data); + + cpu.registers.program_counter = Address(0x4000); + + cpu.run(); +} +``` diff --git a/build.rs b/build.rs new file mode 100644 index 0000000..a780b3d --- /dev/null +++ b/build.rs @@ -0,0 +1,5 @@ +extern crate skeptic; + +fn main() { + skeptic::generate_doc_tests(&["README.md"]); +} diff --git a/src/address.rs b/src/address.rs index 0479a96..b3a00f4 100644 --- a/src/address.rs +++ b/src/address.rs @@ -25,7 +25,7 @@ // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE // POSSIBILITY OF SUCH DAMAGE. -use std::ops::Add; +use core::ops::Add; // The idea here is that it doesn't make sense to add two addresses, but it // does make sense to add an address and an "address-difference". (If this @@ -42,8 +42,7 @@ impl Add for Address { fn add(self, AddressDiff(rhs): AddressDiff) -> Address { let Address(lhs) = self; - // TODO akeeton: Do a checked cast. - Address(((lhs as i32) + rhs) as u16) + Address(((i32::from(lhs)) + rhs) as u16) } } diff --git a/src/bin/main.rs b/src/bin/mos6502.rs similarity index 94% rename from src/bin/main.rs rename to src/bin/mos6502.rs index 22e0586..f8c4612 100644 --- a/src/bin/main.rs +++ b/src/bin/mos6502.rs @@ -39,10 +39,8 @@ fn main() { // "Load" a program - // JAM: FIXME: What's the syntax for specifying the array element type, - // but not the length? (For a fixed-size array) - let zero_page_data: [u8; 17] = [ + let zero_page_data = [ // ZeroPage data start 0x00, 0x02, // ADC ZeroPage target @@ -63,7 +61,7 @@ fn main() { 0x80, // ADC IndirectIndexedY address ]; - let program: [u8; 33] = [ + let program = [ // Code start 0xA9, // LDA Immediate 0x01, // Immediate operand @@ -100,7 +98,7 @@ fn main() { 0xFF, // Something invalid -- the end! ]; - let data: [u8; 25] = [ + let data = [ 0x00, 0x09, // ADC Absolute target 0x00, diff --git a/src/cpu.rs b/src/cpu.rs index 2bdca43..972b4de 100644 --- a/src/cpu.rs +++ b/src/cpu.rs @@ -25,15 +25,14 @@ // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE // POSSIBILITY OF SUCH DAMAGE. -use std; - use address::{Address, AddressDiff}; use instruction; use instruction::{DecodedInstr, Instruction, OpInput}; use memory::Memory; use registers::{Registers, StackPointer, Status, StatusArgs}; -use registers::{PS_CARRY, PS_DECIMAL_MODE, PS_DISABLE_INTERRUPTS, PS_NEGATIVE, PS_OVERFLOW, - PS_ZERO}; +use registers::{ + PS_CARRY, PS_DECIMAL_MODE, PS_DISABLE_INTERRUPTS, PS_NEGATIVE, PS_OVERFLOW, PS_ZERO, +}; #[derive(Clone)] pub struct CPU { @@ -410,12 +409,8 @@ impl CPU { } pub fn run(&mut self) { - loop { - if let Some(decoded_instr) = self.fetch_next_and_decode() { - self.execute_instruction(decoded_instr); - } else { - break; - } + while let Some(decoded_instr) = self.fetch_next_and_decode() { + self.execute_instruction(decoded_instr); } } @@ -758,8 +753,8 @@ impl CPU { } } -impl std::fmt::Debug for CPU { - fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result { +impl core::fmt::Debug for CPU { + fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result { write!( f, "CPU Dump:\n\nAccumulator: {}", @@ -776,385 +771,385 @@ mod tests { #[test] fn add_with_carry_test() { - let mut CPU = CPU::new(); + let mut cpu = CPU::new(); - CPU.add_with_carry(1); - assert_eq!(CPU.registers.accumulator, 1); - assert_eq!(CPU.registers.status.contains(PS_CARRY), false); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), false); + cpu.add_with_carry(1); + assert_eq!(cpu.registers.accumulator, 1); + assert_eq!(cpu.registers.status.contains(PS_CARRY), false); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), false); - CPU.add_with_carry(-1); - assert_eq!(CPU.registers.accumulator, 0); - assert_eq!(CPU.registers.status.contains(PS_CARRY), true); - assert_eq!(CPU.registers.status.contains(PS_ZERO), true); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), false); + cpu.add_with_carry(-1); + assert_eq!(cpu.registers.accumulator, 0); + assert_eq!(cpu.registers.status.contains(PS_CARRY), true); + assert_eq!(cpu.registers.status.contains(PS_ZERO), true); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), false); - CPU.add_with_carry(1); - assert_eq!(CPU.registers.accumulator, 2); - assert_eq!(CPU.registers.status.contains(PS_CARRY), false); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), false); + cpu.add_with_carry(1); + assert_eq!(cpu.registers.accumulator, 2); + assert_eq!(cpu.registers.status.contains(PS_CARRY), false); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), false); - let mut CPU = CPU::new(); + let mut cpu = CPU::new(); - CPU.add_with_carry(127); - assert_eq!(CPU.registers.accumulator, 127); - assert_eq!(CPU.registers.status.contains(PS_CARRY), false); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), false); + cpu.add_with_carry(127); + assert_eq!(cpu.registers.accumulator, 127); + assert_eq!(cpu.registers.status.contains(PS_CARRY), false); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), false); - CPU.add_with_carry(-127); - assert_eq!(CPU.registers.accumulator, 0); - assert_eq!(CPU.registers.status.contains(PS_CARRY), true); - assert_eq!(CPU.registers.status.contains(PS_ZERO), true); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), false); + cpu.add_with_carry(-127); + assert_eq!(cpu.registers.accumulator, 0); + assert_eq!(cpu.registers.status.contains(PS_CARRY), true); + assert_eq!(cpu.registers.status.contains(PS_ZERO), true); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), false); - CPU.registers.status.remove(PS_CARRY); - CPU.add_with_carry(-128); - assert_eq!(CPU.registers.accumulator, -128); - assert_eq!(CPU.registers.status.contains(PS_CARRY), false); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), true); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), false); + cpu.registers.status.remove(PS_CARRY); + cpu.add_with_carry(-128); + assert_eq!(cpu.registers.accumulator, -128); + assert_eq!(cpu.registers.status.contains(PS_CARRY), false); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), true); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), false); - CPU.add_with_carry(127); - assert_eq!(CPU.registers.accumulator, -1); - assert_eq!(CPU.registers.status.contains(PS_CARRY), false); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), true); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), false); + cpu.add_with_carry(127); + assert_eq!(cpu.registers.accumulator, -1); + assert_eq!(cpu.registers.status.contains(PS_CARRY), false); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), true); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), false); - let mut CPU = CPU::new(); + let mut cpu = CPU::new(); - CPU.add_with_carry(127); - assert_eq!(CPU.registers.accumulator, 127); - assert_eq!(CPU.registers.status.contains(PS_CARRY), false); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), false); + cpu.add_with_carry(127); + assert_eq!(cpu.registers.accumulator, 127); + assert_eq!(cpu.registers.status.contains(PS_CARRY), false); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), false); - CPU.add_with_carry(1); - assert_eq!(CPU.registers.accumulator, -128); - assert_eq!(CPU.registers.status.contains(PS_CARRY), false); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), true); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), true); + cpu.add_with_carry(1); + assert_eq!(cpu.registers.accumulator, -128); + assert_eq!(cpu.registers.status.contains(PS_CARRY), false); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), true); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), true); } #[test] fn and_test() { - let mut CPU = CPU::new(); + let mut cpu = CPU::new(); - CPU.registers.accumulator = 0; - CPU.and(-1); - assert_eq!(CPU.registers.accumulator, 0); - assert_eq!(CPU.registers.status.contains(PS_ZERO), true); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); + cpu.registers.accumulator = 0; + cpu.and(-1); + assert_eq!(cpu.registers.accumulator, 0); + assert_eq!(cpu.registers.status.contains(PS_ZERO), true); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); - CPU.registers.accumulator = -1; - CPU.and(0); - assert_eq!(CPU.registers.accumulator, 0); - assert_eq!(CPU.registers.status.contains(PS_ZERO), true); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); + cpu.registers.accumulator = -1; + cpu.and(0); + assert_eq!(cpu.registers.accumulator, 0); + assert_eq!(cpu.registers.status.contains(PS_ZERO), true); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); - CPU.registers.accumulator = -1; - CPU.and(0x0f); - assert_eq!(CPU.registers.accumulator, 0x0f); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); + cpu.registers.accumulator = -1; + cpu.and(0x0f); + assert_eq!(cpu.registers.accumulator, 0x0f); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); - CPU.registers.accumulator = -1; - CPU.and(-128); - assert_eq!(CPU.registers.accumulator, -128); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), true); + cpu.registers.accumulator = -1; + cpu.and(-128); + assert_eq!(cpu.registers.accumulator, -128); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), true); } #[test] fn subtract_with_carry_test() { - let mut CPU = CPU::new(); + let mut cpu = CPU::new(); - CPU.execute_instruction((Instruction::SEC, OpInput::UseImplied)); - CPU.registers.accumulator = 0; + cpu.execute_instruction((Instruction::SEC, OpInput::UseImplied)); + cpu.registers.accumulator = 0; - CPU.subtract_with_carry(1); - assert_eq!(CPU.registers.accumulator, -1); - assert_eq!(CPU.registers.status.contains(PS_CARRY), true); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), true); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), false); + cpu.subtract_with_carry(1); + assert_eq!(cpu.registers.accumulator, -1); + assert_eq!(cpu.registers.status.contains(PS_CARRY), true); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), true); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), false); - CPU.execute_instruction((Instruction::SEC, OpInput::UseImplied)); - CPU.registers.accumulator = -128; - CPU.subtract_with_carry(1); - assert_eq!(CPU.registers.accumulator, 127); - assert_eq!(CPU.registers.status.contains(PS_CARRY), false); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), true); + cpu.execute_instruction((Instruction::SEC, OpInput::UseImplied)); + cpu.registers.accumulator = -128; + cpu.subtract_with_carry(1); + assert_eq!(cpu.registers.accumulator, 127); + assert_eq!(cpu.registers.status.contains(PS_CARRY), false); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), true); - CPU.execute_instruction((Instruction::SEC, OpInput::UseImplied)); - CPU.registers.accumulator = 127; - CPU.subtract_with_carry(-1); - assert_eq!(CPU.registers.accumulator, -128); - assert_eq!(CPU.registers.status.contains(PS_CARRY), true); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), true); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), true); + cpu.execute_instruction((Instruction::SEC, OpInput::UseImplied)); + cpu.registers.accumulator = 127; + cpu.subtract_with_carry(-1); + assert_eq!(cpu.registers.accumulator, -128); + assert_eq!(cpu.registers.status.contains(PS_CARRY), true); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), true); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), true); - CPU.execute_instruction((Instruction::CLC, OpInput::UseImplied)); - CPU.registers.accumulator = -64; - CPU.subtract_with_carry(64); - assert_eq!(CPU.registers.accumulator, 127); - assert_eq!(CPU.registers.status.contains(PS_CARRY), false); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), true); + cpu.execute_instruction((Instruction::CLC, OpInput::UseImplied)); + cpu.registers.accumulator = -64; + cpu.subtract_with_carry(64); + assert_eq!(cpu.registers.accumulator, 127); + assert_eq!(cpu.registers.status.contains(PS_CARRY), false); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), true); - CPU.execute_instruction((Instruction::SEC, OpInput::UseImplied)); - CPU.registers.accumulator = 0; - CPU.subtract_with_carry(-128); - assert_eq!(CPU.registers.accumulator, -128); - assert_eq!(CPU.registers.status.contains(PS_CARRY), true); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), true); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), true); + cpu.execute_instruction((Instruction::SEC, OpInput::UseImplied)); + cpu.registers.accumulator = 0; + cpu.subtract_with_carry(-128); + assert_eq!(cpu.registers.accumulator, -128); + assert_eq!(cpu.registers.status.contains(PS_CARRY), true); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), true); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), true); - CPU.execute_instruction((Instruction::CLC, OpInput::UseImplied)); - CPU.registers.accumulator = 0; - CPU.subtract_with_carry(127); - assert_eq!(CPU.registers.accumulator, -128); - assert_eq!(CPU.registers.status.contains(PS_CARRY), true); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), true); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), false); + cpu.execute_instruction((Instruction::CLC, OpInput::UseImplied)); + cpu.registers.accumulator = 0; + cpu.subtract_with_carry(127); + assert_eq!(cpu.registers.accumulator, -128); + assert_eq!(cpu.registers.status.contains(PS_CARRY), true); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), true); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), false); } #[test] fn decrement_memory_test() { - let mut CPU = CPU::new(); + let mut cpu = CPU::new(); let addr = Address(0xA1B2); - CPU.memory.set_byte(addr, 5); + cpu.memory.set_byte(addr, 5); - CPU.decrement_memory(addr); - assert_eq!(CPU.memory.get_byte(addr), 4); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); + cpu.decrement_memory(addr); + assert_eq!(cpu.memory.get_byte(addr), 4); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); - CPU.decrement_memory(addr); - assert_eq!(CPU.memory.get_byte(addr), 3); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); + cpu.decrement_memory(addr); + assert_eq!(cpu.memory.get_byte(addr), 3); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); - CPU.decrement_memory(addr); - CPU.decrement_memory(addr); - CPU.decrement_memory(addr); - assert_eq!(CPU.memory.get_byte(addr), 0); - assert_eq!(CPU.registers.status.contains(PS_ZERO), true); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); + cpu.decrement_memory(addr); + cpu.decrement_memory(addr); + cpu.decrement_memory(addr); + assert_eq!(cpu.memory.get_byte(addr), 0); + assert_eq!(cpu.registers.status.contains(PS_ZERO), true); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); - CPU.decrement_memory(addr); - assert_eq!(CPU.memory.get_byte(addr) as i8, -1); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), true); + cpu.decrement_memory(addr); + assert_eq!(cpu.memory.get_byte(addr) as i8, -1); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), true); } #[test] fn logical_shift_right_test() { // Testing UseImplied version (which targets the accumulator) only, for now - let mut CPU = CPU::new(); - CPU.execute_instruction((Instruction::LDA, OpInput::UseImmediate(0))); - CPU.execute_instruction((Instruction::LSR, OpInput::UseImplied)); - assert_eq!(CPU.registers.accumulator, 0); - assert_eq!(CPU.registers.status.contains(PS_CARRY), false); - assert_eq!(CPU.registers.status.contains(PS_ZERO), true); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), false); + let mut cpu = CPU::new(); + cpu.execute_instruction((Instruction::LDA, OpInput::UseImmediate(0))); + cpu.execute_instruction((Instruction::LSR, OpInput::UseImplied)); + assert_eq!(cpu.registers.accumulator, 0); + assert_eq!(cpu.registers.status.contains(PS_CARRY), false); + assert_eq!(cpu.registers.status.contains(PS_ZERO), true); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), false); - CPU.execute_instruction((Instruction::LDA, OpInput::UseImmediate(1))); - CPU.execute_instruction((Instruction::LSR, OpInput::UseImplied)); - assert_eq!(CPU.registers.accumulator, 0); - assert_eq!(CPU.registers.status.contains(PS_CARRY), true); - assert_eq!(CPU.registers.status.contains(PS_ZERO), true); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), false); + cpu.execute_instruction((Instruction::LDA, OpInput::UseImmediate(1))); + cpu.execute_instruction((Instruction::LSR, OpInput::UseImplied)); + assert_eq!(cpu.registers.accumulator, 0); + assert_eq!(cpu.registers.status.contains(PS_CARRY), true); + assert_eq!(cpu.registers.status.contains(PS_ZERO), true); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), false); - CPU.execute_instruction((Instruction::LDA, OpInput::UseImmediate(255))); - CPU.execute_instruction((Instruction::LSR, OpInput::UseImplied)); - assert_eq!(CPU.registers.accumulator, 0x7F); - assert_eq!(CPU.registers.status.contains(PS_CARRY), true); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), false); + cpu.execute_instruction((Instruction::LDA, OpInput::UseImmediate(255))); + cpu.execute_instruction((Instruction::LSR, OpInput::UseImplied)); + assert_eq!(cpu.registers.accumulator, 0x7F); + assert_eq!(cpu.registers.status.contains(PS_CARRY), true); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), false); - CPU.execute_instruction((Instruction::LDA, OpInput::UseImmediate(254))); - CPU.execute_instruction((Instruction::LSR, OpInput::UseImplied)); - assert_eq!(CPU.registers.accumulator, 0x7F); - assert_eq!(CPU.registers.status.contains(PS_CARRY), false); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), false); + cpu.execute_instruction((Instruction::LDA, OpInput::UseImmediate(254))); + cpu.execute_instruction((Instruction::LSR, OpInput::UseImplied)); + assert_eq!(cpu.registers.accumulator, 0x7F); + assert_eq!(cpu.registers.status.contains(PS_CARRY), false); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), false); } #[test] fn dec_x_test() { - let mut CPU = CPU::new(); + let mut cpu = CPU::new(); - CPU.dec_x(); - assert_eq!(CPU.registers.index_x, -1); - assert_eq!(CPU.registers.status.contains(PS_CARRY), false); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), true); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), false); + cpu.dec_x(); + assert_eq!(cpu.registers.index_x, -1); + assert_eq!(cpu.registers.status.contains(PS_CARRY), false); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), true); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), false); - CPU.dec_x(); - assert_eq!(CPU.registers.index_x, -2); - assert_eq!(CPU.registers.status.contains(PS_CARRY), false); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), true); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), false); + cpu.dec_x(); + assert_eq!(cpu.registers.index_x, -2); + assert_eq!(cpu.registers.status.contains(PS_CARRY), false); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), true); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), false); - CPU.load_x_register(5); - CPU.dec_x(); - assert_eq!(CPU.registers.index_x, 4); - assert_eq!(CPU.registers.status.contains(PS_CARRY), false); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), false); + cpu.load_x_register(5); + cpu.dec_x(); + assert_eq!(cpu.registers.index_x, 4); + assert_eq!(cpu.registers.status.contains(PS_CARRY), false); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), false); - CPU.dec_x(); - CPU.dec_x(); - CPU.dec_x(); - CPU.dec_x(); + cpu.dec_x(); + cpu.dec_x(); + cpu.dec_x(); + cpu.dec_x(); - assert_eq!(CPU.registers.index_x, 0); - assert_eq!(CPU.registers.status.contains(PS_CARRY), false); - assert_eq!(CPU.registers.status.contains(PS_ZERO), true); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), false); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), false); + assert_eq!(cpu.registers.index_x, 0); + assert_eq!(cpu.registers.status.contains(PS_CARRY), false); + assert_eq!(cpu.registers.status.contains(PS_ZERO), true); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), false); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), false); - CPU.dec_x(); - assert_eq!(CPU.registers.index_x, -1); - assert_eq!(CPU.registers.status.contains(PS_CARRY), false); - assert_eq!(CPU.registers.status.contains(PS_ZERO), false); - assert_eq!(CPU.registers.status.contains(PS_NEGATIVE), true); - assert_eq!(CPU.registers.status.contains(PS_OVERFLOW), false); + cpu.dec_x(); + assert_eq!(cpu.registers.index_x, -1); + assert_eq!(cpu.registers.status.contains(PS_CARRY), false); + assert_eq!(cpu.registers.status.contains(PS_ZERO), false); + assert_eq!(cpu.registers.status.contains(PS_NEGATIVE), true); + assert_eq!(cpu.registers.status.contains(PS_OVERFLOW), false); } #[test] fn jump_test() { - let mut CPU = CPU::new(); + let mut cpu = CPU::new(); let addr = Address(0xA1B1); - CPU.jump(addr); - assert_eq!(CPU.registers.program_counter, addr); + cpu.jump(addr); + assert_eq!(cpu.registers.program_counter, addr); } #[test] fn branch_if_carry_clear_test() { - let mut CPU = CPU::new(); + let mut cpu = CPU::new(); - CPU.execute_instruction((Instruction::SEC, OpInput::UseImplied)); - CPU.branch_if_carry_clear(Address(0xABCD)); - assert_eq!(CPU.registers.program_counter, Address(0)); + cpu.execute_instruction((Instruction::SEC, OpInput::UseImplied)); + cpu.branch_if_carry_clear(Address(0xABCD)); + assert_eq!(cpu.registers.program_counter, Address(0)); - CPU.execute_instruction((Instruction::CLC, OpInput::UseImplied)); - CPU.branch_if_carry_clear(Address(0xABCD)); - assert_eq!(CPU.registers.program_counter, Address(0xABCD)); + cpu.execute_instruction((Instruction::CLC, OpInput::UseImplied)); + cpu.branch_if_carry_clear(Address(0xABCD)); + assert_eq!(cpu.registers.program_counter, Address(0xABCD)); } #[test] fn branch_if_carry_set_test() { - let mut CPU = CPU::new(); + let mut cpu = CPU::new(); - CPU.execute_instruction((Instruction::CLC, OpInput::UseImplied)); - CPU.branch_if_carry_set(Address(0xABCD)); - assert_eq!(CPU.registers.program_counter, Address(0)); + cpu.execute_instruction((Instruction::CLC, OpInput::UseImplied)); + cpu.branch_if_carry_set(Address(0xABCD)); + assert_eq!(cpu.registers.program_counter, Address(0)); - CPU.execute_instruction((Instruction::SEC, OpInput::UseImplied)); - CPU.branch_if_carry_set(Address(0xABCD)); - assert_eq!(CPU.registers.program_counter, Address(0xABCD)); + cpu.execute_instruction((Instruction::SEC, OpInput::UseImplied)); + cpu.branch_if_carry_set(Address(0xABCD)); + assert_eq!(cpu.registers.program_counter, Address(0xABCD)); } #[test] fn branch_if_equal_test() { - let mut CPU = CPU::new(); + let mut cpu = CPU::new(); - CPU.branch_if_equal(Address(0xABCD)); - assert_eq!(CPU.registers.program_counter, Address(0)); + cpu.branch_if_equal(Address(0xABCD)); + assert_eq!(cpu.registers.program_counter, Address(0)); - CPU.registers.status.or(PS_ZERO); - CPU.branch_if_equal(Address(0xABCD)); - assert_eq!(CPU.registers.program_counter, Address(0xABCD)); + cpu.registers.status.or(PS_ZERO); + cpu.branch_if_equal(Address(0xABCD)); + assert_eq!(cpu.registers.program_counter, Address(0xABCD)); } #[test] fn branch_if_minus_test() { { - let mut CPU = CPU::new(); - let registers_before = CPU.registers; + let mut cpu = CPU::new(); + let registers_before = cpu.registers; - CPU.branch_if_minus(Address(0xABCD)); - assert_eq!(CPU.registers, registers_before); - assert_eq!(CPU.registers.program_counter, Address(0)); + cpu.branch_if_minus(Address(0xABCD)); + assert_eq!(cpu.registers, registers_before); + assert_eq!(cpu.registers.program_counter, Address(0)); } { - let mut CPU = CPU::new(); + let mut cpu = CPU::new(); - CPU.registers.status.or(PS_NEGATIVE); - let registers_before = CPU.registers; + cpu.registers.status.or(PS_NEGATIVE); + let registers_before = cpu.registers; - CPU.branch_if_minus(Address(0xABCD)); - assert_eq!(CPU.registers.status, registers_before.status); - assert_eq!(CPU.registers.program_counter, Address(0xABCD)); + cpu.branch_if_minus(Address(0xABCD)); + assert_eq!(cpu.registers.status, registers_before.status); + assert_eq!(cpu.registers.program_counter, Address(0xABCD)); } } #[test] fn branch_if_positive_test() { - let mut CPU = CPU::new(); + let mut cpu = CPU::new(); - CPU.registers.status.insert(PS_NEGATIVE); - CPU.branch_if_positive(Address(0xABCD)); - assert_eq!(CPU.registers.program_counter, Address(0)); + cpu.registers.status.insert(PS_NEGATIVE); + cpu.branch_if_positive(Address(0xABCD)); + assert_eq!(cpu.registers.program_counter, Address(0)); - CPU.registers.status.remove(PS_NEGATIVE); - CPU.branch_if_positive(Address(0xABCD)); - assert_eq!(CPU.registers.program_counter, Address(0xABCD)); + cpu.registers.status.remove(PS_NEGATIVE); + cpu.branch_if_positive(Address(0xABCD)); + assert_eq!(cpu.registers.program_counter, Address(0xABCD)); } #[test] fn branch_if_overflow_clear_test() { - let mut CPU = CPU::new(); + let mut cpu = CPU::new(); - CPU.registers.status.insert(PS_OVERFLOW); - CPU.branch_if_overflow_clear(Address(0xABCD)); - assert_eq!(CPU.registers.program_counter, Address(0)); + cpu.registers.status.insert(PS_OVERFLOW); + cpu.branch_if_overflow_clear(Address(0xABCD)); + assert_eq!(cpu.registers.program_counter, Address(0)); - CPU.registers.status.remove(PS_OVERFLOW); - CPU.branch_if_overflow_clear(Address(0xABCD)); - assert_eq!(CPU.registers.program_counter, Address(0xABCD)); + cpu.registers.status.remove(PS_OVERFLOW); + cpu.branch_if_overflow_clear(Address(0xABCD)); + assert_eq!(cpu.registers.program_counter, Address(0xABCD)); } #[test] fn branch_if_overflow_set_test() { - let mut CPU = CPU::new(); + let mut cpu = CPU::new(); - CPU.branch_if_overflow_set(Address(0xABCD)); - assert_eq!(CPU.registers.program_counter, Address(0)); + cpu.branch_if_overflow_set(Address(0xABCD)); + assert_eq!(cpu.registers.program_counter, Address(0)); - CPU.registers.status.insert(PS_OVERFLOW); - CPU.branch_if_overflow_set(Address(0xABCD)); - assert_eq!(CPU.registers.program_counter, Address(0xABCD)); + cpu.registers.status.insert(PS_OVERFLOW); + cpu.branch_if_overflow_set(Address(0xABCD)); + assert_eq!(cpu.registers.program_counter, Address(0xABCD)); } #[cfg(test)] @@ -1162,61 +1157,56 @@ mod tests { where F: FnMut(&mut CPU, u8), { - let mut CPU = CPU::new(); + let mut cpu = CPU::new(); - CPU.execute_instruction((load_instruction, OpInput::UseImmediate(127))); + cpu.execute_instruction((load_instruction, OpInput::UseImmediate(127))); - compare(&mut CPU, 127); - assert!(CPU.registers.status.contains(PS_ZERO)); - assert!(CPU.registers.status.contains(PS_CARRY)); - assert!(!CPU.registers.status.contains(PS_NEGATIVE)); + compare(&mut cpu, 127); + assert!(cpu.registers.status.contains(PS_ZERO)); + assert!(cpu.registers.status.contains(PS_CARRY)); + assert!(!cpu.registers.status.contains(PS_NEGATIVE)); + cpu.execute_instruction((load_instruction, OpInput::UseImmediate(127))); - CPU.execute_instruction((load_instruction, OpInput::UseImmediate(127))); + compare(&mut cpu, 1); + assert!(!cpu.registers.status.contains(PS_ZERO)); + assert!(cpu.registers.status.contains(PS_CARRY)); + assert!(!cpu.registers.status.contains(PS_NEGATIVE)); - compare(&mut CPU, 1); - assert!(!CPU.registers.status.contains(PS_ZERO)); - assert!(CPU.registers.status.contains(PS_CARRY)); - assert!(!CPU.registers.status.contains(PS_NEGATIVE)); + cpu.execute_instruction((load_instruction, OpInput::UseImmediate(1))); + compare(&mut cpu, 2); + assert!(!cpu.registers.status.contains(PS_ZERO)); + assert!(!cpu.registers.status.contains(PS_CARRY)); + assert!(cpu.registers.status.contains(PS_NEGATIVE)); - CPU.execute_instruction((load_instruction, OpInput::UseImmediate(1))); + cpu.execute_instruction((load_instruction, OpInput::UseImmediate(20))); - compare(&mut CPU, 2); - assert!(!CPU.registers.status.contains(PS_ZERO)); - assert!(!CPU.registers.status.contains(PS_CARRY)); - assert!(CPU.registers.status.contains(PS_NEGATIVE)); + compare(&mut cpu, -50i8 as u8); + assert!(!cpu.registers.status.contains(PS_ZERO)); + assert!(!cpu.registers.status.contains(PS_CARRY)); + assert!(!cpu.registers.status.contains(PS_NEGATIVE)); + cpu.execute_instruction((load_instruction, OpInput::UseImmediate(1))); - CPU.execute_instruction((load_instruction, OpInput::UseImmediate(20))); + compare(&mut cpu, -1i8 as u8); + assert!(!cpu.registers.status.contains(PS_ZERO)); + assert!(!cpu.registers.status.contains(PS_CARRY)); + assert!(!cpu.registers.status.contains(PS_NEGATIVE)); - compare(&mut CPU, -50i8 as u8); - assert!(!CPU.registers.status.contains(PS_ZERO)); - assert!(!CPU.registers.status.contains(PS_CARRY)); - assert!(!CPU.registers.status.contains(PS_NEGATIVE)); + cpu.execute_instruction((load_instruction, OpInput::UseImmediate(127))); - - CPU.execute_instruction((load_instruction, OpInput::UseImmediate(1))); - - compare(&mut CPU, -1i8 as u8); - assert!(!CPU.registers.status.contains(PS_ZERO)); - assert!(!CPU.registers.status.contains(PS_CARRY)); - assert!(!CPU.registers.status.contains(PS_NEGATIVE)); - - - CPU.execute_instruction((load_instruction, OpInput::UseImmediate(127))); - - compare(&mut CPU, -128i8 as u8); - assert!(!CPU.registers.status.contains(PS_ZERO)); - assert!(!CPU.registers.status.contains(PS_CARRY)); - assert!(CPU.registers.status.contains(PS_NEGATIVE)); + compare(&mut cpu, -128i8 as u8); + assert!(!cpu.registers.status.contains(PS_ZERO)); + assert!(!cpu.registers.status.contains(PS_CARRY)); + assert!(cpu.registers.status.contains(PS_NEGATIVE)); } #[test] fn compare_with_a_register_test() { compare_test_helper( - &mut |CPU: &mut CPU, val: u8| { - CPU.compare_with_a_register(val); + &mut |cpu: &mut CPU, val: u8| { + cpu.compare_with_a_register(val); }, Instruction::LDA, ); @@ -1225,8 +1215,8 @@ mod tests { #[test] fn compare_with_x_register_test() { compare_test_helper( - &mut |CPU: &mut CPU, val: u8| { - CPU.compare_with_x_register(val); + &mut |cpu: &mut CPU, val: u8| { + cpu.compare_with_x_register(val); }, Instruction::LDX, ); @@ -1235,8 +1225,8 @@ mod tests { #[test] fn compare_with_y_register_test() { compare_test_helper( - &mut |CPU: &mut CPU, val: u8| { - CPU.compare_with_y_register(val); + &mut |cpu: &mut CPU, val: u8| { + cpu.compare_with_y_register(val); }, Instruction::LDY, ); @@ -1244,27 +1234,27 @@ mod tests { #[test] fn exclusive_or_test() { - let mut CPU = CPU::new(); + let mut cpu = CPU::new(); for a_before in range_inclusive(0u8, 255u8) { for val in range_inclusive(0u8, 255u8) { - CPU.execute_instruction((Instruction::LDA, OpInput::UseImmediate(a_before))); + cpu.execute_instruction((Instruction::LDA, OpInput::UseImmediate(a_before))); - CPU.exclusive_or(val); + cpu.exclusive_or(val); let a_after = a_before ^ val; - assert_eq!(CPU.registers.accumulator, a_after as i8); + assert_eq!(cpu.registers.accumulator, a_after as i8); if a_after == 0 { - assert!(CPU.registers.status.contains(PS_ZERO)); + assert!(cpu.registers.status.contains(PS_ZERO)); } else { - assert!(!CPU.registers.status.contains(PS_ZERO)); + assert!(!cpu.registers.status.contains(PS_ZERO)); } if (a_after as i8) < 0 { - assert!(CPU.registers.status.contains(PS_NEGATIVE)); + assert!(cpu.registers.status.contains(PS_NEGATIVE)); } else { - assert!(!CPU.registers.status.contains(PS_NEGATIVE)); + assert!(!cpu.registers.status.contains(PS_NEGATIVE)); } } } @@ -1272,29 +1262,30 @@ mod tests { #[test] fn inclusive_or_test() { - let mut CPU = CPU::new(); + let mut cpu = CPU::new(); for a_before in range_inclusive(0u8, 255u8) { for val in range_inclusive(0u8, 255u8) { - CPU.execute_instruction((Instruction::LDA, OpInput::UseImmediate(a_before))); + cpu.execute_instruction((Instruction::LDA, OpInput::UseImmediate(a_before))); - CPU.inclusive_or(val); + cpu.inclusive_or(val); let a_after = a_before | val; - assert_eq!(CPU.registers.accumulator, a_after as i8); + assert_eq!(cpu.registers.accumulator, a_after as i8); if a_after == 0 { - assert!(CPU.registers.status.contains(PS_ZERO)); + assert!(cpu.registers.status.contains(PS_ZERO)); } else { - assert!(!CPU.registers.status.contains(PS_ZERO)); + assert!(!cpu.registers.status.contains(PS_ZERO)); } if (a_after as i8) < 0 { - assert!(CPU.registers.status.contains(PS_NEGATIVE)); + assert!(cpu.registers.status.contains(PS_NEGATIVE)); } else { - assert!(!CPU.registers.status.contains(PS_NEGATIVE)); + assert!(!cpu.registers.status.contains(PS_NEGATIVE)); } } } } } + diff --git a/src/instruction.rs b/src/instruction.rs index cf77feb..ac053f2 100644 --- a/src/instruction.rs +++ b/src/instruction.rs @@ -139,7 +139,7 @@ pub enum AddressingMode { fn arr_to_addr(arr: &[u8]) -> Address { debug_assert!(arr.len() == 2); - let x = (arr[0] as u16) + ((arr[1] as u16) << 8usize); + let x = u16::from(arr[0]) + (u16::from(arr[1]) << 8usize); Address(x) } @@ -187,19 +187,19 @@ impl AddressingMode { // Use [u8, ..1] from instruction // Interpret as zero page address // (Output: an 8-bit zero-page address) - OpInput::UseAddress(Address(arr[0] as u16)) + OpInput::UseAddress(Address(u16::from(arr[0]))) } AddressingMode::ZeroPageX => { // Use [u8, ..1] from instruction // Add to X register (as u8 -- the final address is in 0-page) // (Output: an 8-bit zero-page address) - OpInput::UseAddress(Address((arr[0] + x) as u16)) + OpInput::UseAddress(Address(u16::from(arr[0] + x))) } AddressingMode::ZeroPageY => { // Use [u8, ..1] from instruction // Add to Y register (as u8 -- the final address is in 0-page) // (Output: an 8-bit zero-page address) - OpInput::UseAddress(Address((arr[0] + y) as u16)) + OpInput::UseAddress(Address(u16::from(arr[0] + y))) } AddressingMode::Relative => { // Use [u8, ..1] from instruction @@ -214,12 +214,12 @@ impl AddressingMode { AddressingMode::AbsoluteX => { // Use [u8, ..2] from instruction as address, add X // (Output: a 16-bit address) - OpInput::UseAddress(arr_to_addr(arr) + AddressDiff(x as i32)) + OpInput::UseAddress(arr_to_addr(arr) + AddressDiff(i32::from(x))) } AddressingMode::AbsoluteY => { // Use [u8, ..2] from instruction as address, add Y // (Output: a 16-bit address) - OpInput::UseAddress(arr_to_addr(arr) + AddressDiff(y as i32)) + OpInput::UseAddress(arr_to_addr(arr) + AddressDiff(i32::from(y))) } AddressingMode::Indirect => { // Use [u8, ..2] from instruction as an address. Interpret the @@ -234,7 +234,7 @@ impl AddressingMode { // This is where the absolute (16-bit) target address is stored. // (Output: a 16-bit address) let start = arr[0] + x; - let slice = memory.get_slice(Address(start as u16), AddressDiff(2)); + let slice = memory.get_slice(Address(u16::from(start)), AddressDiff(2)); OpInput::UseAddress(arr_to_addr(slice)) } AddressingMode::IndirectIndexedY => { @@ -243,8 +243,8 @@ impl AddressingMode { // Add Y register to this address to get the final address // (Output: a 16-bit address) let start = arr[0]; - let slice = memory.get_slice(Address(start as u16), AddressDiff(2)); - OpInput::UseAddress(arr_to_addr(slice) + AddressDiff(y as i32)) + let slice = memory.get_slice(Address(u16::from(start)), AddressDiff(2)); + OpInput::UseAddress(arr_to_addr(slice) + AddressDiff(i32::from(y))) } } } diff --git a/src/lib.rs b/src/lib.rs index fd23caf..64e8035 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -25,7 +25,8 @@ // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE // POSSIBILITY OF SUCH DAMAGE. -// Needed for debug! / log! macros +#![no_std] + #[macro_use] extern crate log; @@ -35,7 +36,8 @@ extern crate num; extern crate bitflags; pub mod address; -pub mod instruction; pub mod cpu; +pub mod instruction; pub mod memory; pub mod registers; + diff --git a/src/registers.rs b/src/registers.rs index 77ea196..485e923 100644 --- a/src/registers.rs +++ b/src/registers.rs @@ -58,17 +58,17 @@ impl StatusArgs { bitflags! { pub struct Status: u8 { - const PS_NEGATIVE = 0b10000000; - const PS_OVERFLOW = 0b01000000; - const PS_UNUSED = 0b00100000; // JAM: Should this exist? + const PS_NEGATIVE = 0b1000_0000; + const PS_OVERFLOW = 0b0100_0000; + const PS_UNUSED = 0b0010_0000; // JAM: Should this exist? // (note that it affects the // behavior of things like // from_bits_truncate) - const PS_BRK = 0b00010000; - const PS_DECIMAL_MODE = 0b00001000; - const PS_DISABLE_INTERRUPTS = 0b00000100; - const PS_ZERO = 0b00000010; - const PS_CARRY = 0b00000001; + const PS_BRK = 0b0001_0000; + const PS_DECIMAL_MODE = 0b0000_1000; + const PS_DISABLE_INTERRUPTS = 0b0000_0100; + const PS_ZERO = 0b0000_0010; + const PS_CARRY = 0b0000_0001; } } @@ -100,39 +100,39 @@ impl Status { let mut out = Status::empty(); if negative { - out = out | PS_NEGATIVE + out |= PS_NEGATIVE } if overflow { - out = out | PS_OVERFLOW + out |= PS_OVERFLOW } if unused { - out = out | PS_UNUSED + out |= PS_UNUSED } if brk { - out = out | PS_BRK + out |= PS_BRK } if decimal_mode { - out = out | PS_DECIMAL_MODE + out |= PS_DECIMAL_MODE } if disable_interrupts { - out = out | PS_DISABLE_INTERRUPTS + out |= PS_DISABLE_INTERRUPTS } if zero { - out = out | PS_ZERO + out |= PS_ZERO } if carry { - out = out | PS_CARRY + out |= PS_CARRY } out } pub fn and(&mut self, rhs: Status) { - *self = *self & rhs; + *self &= rhs; } pub fn or(&mut self, rhs: Status) { - *self = *self | rhs; + *self |= rhs; } pub fn set_with_mask(&mut self, mask: Status, rhs: Status) { @@ -146,7 +146,7 @@ pub struct StackPointer(pub u8); impl StackPointer { pub fn to_address(&self) -> Address { let StackPointer(sp) = *self; - STACK_ADDRESS_LO + AddressDiff(sp as i32) + STACK_ADDRESS_LO + AddressDiff(i32::from(sp)) } // JAM: FIXME: Should we prevent overflow here? What would a 6502 do? diff --git a/tests/skeptic.rs b/tests/skeptic.rs new file mode 100644 index 0000000..ff46c9c --- /dev/null +++ b/tests/skeptic.rs @@ -0,0 +1 @@ +include!(concat!(env!("OUT_DIR"), "/skeptic-tests.rs"));