Start modeling CPU
Wrote a shallow skeleton of a CPU Core. Finally made the disassembler a clap subcommand.
This commit is contained in:
Michel Heily
parent
addea1efa0
commit
9330c53957
142
Cargo.lock
generated
142
Cargo.lock
generated
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@ -1,12 +1,21 @@
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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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name = "arm7tdmi"
|
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||||
dependencies = [
|
||||
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|
||||
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||||
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@ -19,11 +28,31 @@ name = "bit"
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@ -50,19 +84,45 @@ dependencies = [
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||||
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||||
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dependencies = [
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||||
name = "rustboyadvance"
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||||
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source = "registry+https://github.com/rust-lang/crates.io-index"
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name = "syn"
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@ -81,19 +141,89 @@ dependencies = [
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source = "registry+https://github.com/rust-lang/crates.io-index"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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[metadata]
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|
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|
||||
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|
||||
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|
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||||
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@ -10,7 +10,3 @@ enum-primitive-derive = "^0.1"
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num-traits = "^0.1"
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bit = "^0.1"
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clap = {version = "2.33", features = ["color", "yaml"]}
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[[bin]]
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name = "disass"
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path = "src/disass.rs"
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@ -1,373 +0,0 @@
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use crate::bit::BitIndex;
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use crate::num_traits::FromPrimitive;
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use std::convert::TryFrom;
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pub use super::display;
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#[derive(Debug, PartialEq)]
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pub enum ArmError {
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UnknownInstructionFormat(u32),
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UndefinedConditionCode(u32),
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InvalidShiftType(u32),
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InvalidHSBits(u32),
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}
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#[derive(Debug, Copy, Clone, PartialEq, Primitive)]
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pub enum ArmCond {
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Equal = 0b0000,
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NotEqual = 0b0001,
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UnsignedHigherOrSame = 0b0010,
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UnsignedLower = 0b0011,
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Negative = 0b0100,
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PositiveOrZero = 0b0101,
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Overflow = 0b0110,
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NoOverflow = 0b0111,
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UnsignedHigher = 0b1000,
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UnsignedLowerOrSame = 0b1001,
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GreaterOrEqual = 0b1010,
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LessThan = 0b1011,
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GreaterThan = 0b1100,
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LessThanOrEqual = 0b1101,
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Always = 0b1110,
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}
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#[derive(Debug, Copy, Clone, PartialEq)]
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#[allow(non_camel_case_types)]
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pub enum ArmInstructionFormat {
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// Branch and Exchange
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BX,
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// Branch /w Link
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B_BL,
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// Multiply and Multiply-Accumulate
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MUL_MLA,
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// Multiply Long and Multiply-Accumulate Long
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MULL_MLAL,
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// Single Data Transfer
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LDR_STR,
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// Halfword and Signed Data Transfer
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LDR_STR_HS_REG,
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// Halfword and Signed Data Transfer
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LDR_STR_HS_IMM,
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// Data Processing
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DP,
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// Block Data Transfer
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LDM_STM,
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// Single Data Swap
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SWP,
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// Transfer PSR contents to a register
|
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MRS,
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// Transfer register contents to PSR
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MSR_REG,
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// Tanssfer immediate/register to PSR flags only
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MSR_FLAGS,
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}
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#[derive(Debug, Primitive)]
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pub enum ArmOpCode {
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AND = 0b0000,
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EOR = 0b0001,
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SUB = 0b0010,
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RSB = 0b0011,
|
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ADD = 0b0100,
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ADC = 0b0101,
|
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SBC = 0b0110,
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||||
RSC = 0b0111,
|
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TST = 0b1000,
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TEQ = 0b1001,
|
||||
CMP = 0b1010,
|
||||
CMN = 0b1011,
|
||||
ORR = 0b1100,
|
||||
MOV = 0b1101,
|
||||
BIC = 0b1110,
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||||
MVN = 0b1111,
|
||||
}
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|
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#[derive(Debug, PartialEq, Primitive)]
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||||
pub enum ArmHalfwordTransferType {
|
||||
UnsignedHalfwords = 0b01,
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SignedByte = 0b10,
|
||||
SignedHalfwords = 0b11,
|
||||
}
|
||||
|
||||
#[derive(Debug, Copy, Clone, PartialEq)]
|
||||
pub struct ArmInstruction {
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||||
pub cond: ArmCond,
|
||||
pub fmt: ArmInstructionFormat,
|
||||
pub raw: u32,
|
||||
pub pc: u32,
|
||||
}
|
||||
|
||||
impl TryFrom<(u32, u32)> for ArmInstruction {
|
||||
type Error = ArmError;
|
||||
|
||||
fn try_from(value: (u32, u32)) -> Result<Self, Self::Error> {
|
||||
use ArmInstructionFormat::*;
|
||||
let (raw, addr) = value;
|
||||
|
||||
let cond_code = raw.bit_range(28..32) as u8;
|
||||
let cond = match ArmCond::from_u8(cond_code) {
|
||||
Some(cond) => Ok(cond),
|
||||
None => Err(ArmError::UndefinedConditionCode(cond_code as u32)),
|
||||
}?;
|
||||
|
||||
let fmt = if (0x0fff_fff0 & raw) == 0x012f_ff10 {
|
||||
Ok(BX)
|
||||
} else if (0x0e00_0000 & raw) == 0x0a00_0000 {
|
||||
Ok(B_BL)
|
||||
} else if (0xe000_0010 & raw) == 0x0600_0000 {
|
||||
Err(ArmError::UnknownInstructionFormat(raw))
|
||||
} else if (0x0fb0_0ff0 & raw) == 0x0100_0090 {
|
||||
Ok(SWP)
|
||||
} else if (0x0fc0_00f0 & raw) == 0x0000_0090 {
|
||||
Ok(MUL_MLA)
|
||||
} else if (0x0f80_00f0 & raw) == 0x0080_0090 {
|
||||
Ok(MULL_MLAL)
|
||||
} else if (0x0fbf_0fff & raw) == 0x010f_0000 {
|
||||
Ok(MRS)
|
||||
} else if (0x0fbf_fff0 & raw) == 0x0129_f000 {
|
||||
Ok(MSR_REG)
|
||||
} else if (0x0dbf_f000 & raw) == 0x0128_f000 {
|
||||
Ok(MSR_FLAGS)
|
||||
} else if (0x0c00_0000 & raw) == 0x0400_0000 {
|
||||
Ok(LDR_STR)
|
||||
} else if (0x0e40_0F90 & raw) == 0x0000_0090 {
|
||||
Ok(LDR_STR_HS_REG)
|
||||
} else if (0x0e40_0090 & raw) == 0x0040_0090 {
|
||||
Ok(LDR_STR_HS_IMM)
|
||||
} else if (0x0e00_0000 & raw) == 0x0800_0000 {
|
||||
Ok(LDM_STM)
|
||||
} else if (0x0c00_0000 & raw) == 0x0000_0000 {
|
||||
Ok(DP)
|
||||
} else {
|
||||
Err(ArmError::UnknownInstructionFormat(raw))
|
||||
}?;
|
||||
|
||||
Ok(ArmInstruction {
|
||||
cond: cond,
|
||||
fmt: fmt,
|
||||
raw: raw,
|
||||
pc: addr,
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Debug, PartialEq, Primitive)]
|
||||
pub enum ArmShiftType {
|
||||
LSL = 0,
|
||||
LSR = 1,
|
||||
ASR = 2,
|
||||
ROR = 3,
|
||||
}
|
||||
|
||||
#[derive(Debug, PartialEq)]
|
||||
pub enum ArmShift {
|
||||
ImmediateShift(u32, ArmShiftType),
|
||||
RegisterShift(usize, ArmShiftType),
|
||||
}
|
||||
|
||||
impl TryFrom<u32> for ArmShift {
|
||||
type Error = ArmError;
|
||||
|
||||
fn try_from(v: u32) -> Result<Self, Self::Error> {
|
||||
let typ = match ArmShiftType::from_u8(v.bit_range(5..7) as u8) {
|
||||
Some(s) => Ok(s),
|
||||
_ => Err(ArmError::InvalidShiftType(v.bit_range(5..7))),
|
||||
}?;
|
||||
if v.bit(4) {
|
||||
let rs = v.bit_range(8..12) as usize;
|
||||
Ok(ArmShift::RegisterShift(rs, typ))
|
||||
} else {
|
||||
let amount = v.bit_range(7..12) as u32;
|
||||
Ok(ArmShift::ImmediateShift(amount, typ))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Debug, PartialEq)]
|
||||
pub enum ArmShiftedValue {
|
||||
ImmediateValue(i32),
|
||||
RotatedImmediate(u32, u32),
|
||||
ShiftedRegister {
|
||||
reg: usize,
|
||||
shift: ArmShift,
|
||||
added: Option<bool>,
|
||||
},
|
||||
}
|
||||
|
||||
impl ArmShiftedValue {
|
||||
/// Decode operand2 as an immediate value
|
||||
pub fn decode_rotated_immediate(&self) -> Option<i32> {
|
||||
if let ArmShiftedValue::RotatedImmediate(immediate, rotate) = self {
|
||||
return Some(immediate.rotate_right(*rotate) as i32);
|
||||
}
|
||||
None
|
||||
}
|
||||
}
|
||||
|
||||
impl ArmInstruction {
|
||||
pub fn rn(&self) -> usize {
|
||||
match self.fmt {
|
||||
ArmInstructionFormat::MUL_MLA => self.raw.bit_range(12..16) as usize,
|
||||
ArmInstructionFormat::MULL_MLAL => self.raw.bit_range(8..12) as usize,
|
||||
ArmInstructionFormat::BX => self.raw.bit_range(0..4) as usize,
|
||||
_ => self.raw.bit_range(16..20) as usize,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn rd(&self) -> usize {
|
||||
match self.fmt {
|
||||
ArmInstructionFormat::MUL_MLA => self.raw.bit_range(16..20) as usize,
|
||||
_ => self.raw.bit_range(12..16) as usize,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn rm(&self) -> usize {
|
||||
self.raw.bit_range(0..4) as usize
|
||||
}
|
||||
|
||||
pub fn rs(&self) -> usize {
|
||||
self.raw.bit_range(8..12) as usize
|
||||
}
|
||||
|
||||
pub fn rd_lo(&self) -> usize {
|
||||
self.raw.bit_range(12..16) as usize
|
||||
}
|
||||
|
||||
pub fn rd_hi(&self) -> usize {
|
||||
self.raw.bit_range(16..20) as usize
|
||||
}
|
||||
|
||||
pub fn opcode(&self) -> Option<ArmOpCode> {
|
||||
ArmOpCode::from_u32(self.raw.bit_range(21..25))
|
||||
}
|
||||
|
||||
pub fn branch_offset(&self) -> i32 {
|
||||
((((self.raw << 8) as i32) >> 8) << 2) + 8
|
||||
}
|
||||
|
||||
pub fn load_flag(&self) -> bool {
|
||||
self.raw.bit(20)
|
||||
}
|
||||
|
||||
pub fn set_cond_flag(&self) -> bool {
|
||||
self.raw.bit(20)
|
||||
}
|
||||
|
||||
pub fn write_back_flag(&self) -> bool {
|
||||
self.raw.bit(21)
|
||||
}
|
||||
|
||||
pub fn accumulate_flag(&self) -> bool {
|
||||
self.raw.bit(21)
|
||||
}
|
||||
|
||||
pub fn u_flag(&self) -> bool {
|
||||
self.raw.bit(22)
|
||||
}
|
||||
|
||||
pub fn halfword_data_transfer_type(&self) -> Result<ArmHalfwordTransferType, ArmError> {
|
||||
match ArmHalfwordTransferType::from_u32((self.raw & 0b1100000) >> 5) {
|
||||
Some(x) => Ok(x),
|
||||
None => Err(ArmError::InvalidHSBits(self.raw)),
|
||||
}
|
||||
}
|
||||
|
||||
pub fn transfer_size(&self) -> usize {
|
||||
if self.raw.bit(22) {
|
||||
1
|
||||
} else {
|
||||
4
|
||||
}
|
||||
}
|
||||
|
||||
pub fn is_loading_psr_and_forcing_user_mode(&self) -> bool {
|
||||
self.raw.bit(22)
|
||||
}
|
||||
|
||||
pub fn spsr_flag(&self) -> bool {
|
||||
self.raw.bit(22)
|
||||
}
|
||||
|
||||
pub fn add_offset_flag(&self) -> bool {
|
||||
self.raw.bit(23)
|
||||
}
|
||||
|
||||
pub fn pre_index_flag(&self) -> bool {
|
||||
self.raw.bit(24)
|
||||
}
|
||||
|
||||
pub fn link_flag(&self) -> bool {
|
||||
self.raw.bit(24)
|
||||
}
|
||||
|
||||
/// gets offset used by ldr/str instructions
|
||||
pub fn ldr_str_offset(&self) -> ArmShiftedValue {
|
||||
let ofs = self.raw.bit_range(0..12);
|
||||
if self.raw.bit(25) {
|
||||
let rm = ofs & 0xf;
|
||||
let shift = ArmShift::try_from(ofs).unwrap();
|
||||
ArmShiftedValue::ShiftedRegister {
|
||||
reg: rm as usize,
|
||||
shift: shift,
|
||||
added: Some(self.add_offset_flag()),
|
||||
}
|
||||
} else {
|
||||
let ofs = if self.add_offset_flag() {
|
||||
ofs as i32
|
||||
} else {
|
||||
-(ofs as i32)
|
||||
};
|
||||
ArmShiftedValue::ImmediateValue(ofs)
|
||||
}
|
||||
}
|
||||
|
||||
pub fn ldr_str_hs_offset(&self) -> Option<ArmShiftedValue> {
|
||||
match self.fmt {
|
||||
ArmInstructionFormat::LDR_STR_HS_IMM => {
|
||||
let offset8 = (self.raw.bit_range(8..12) << 4) + self.raw.bit_range(0..4);
|
||||
let offset8 = if self.add_offset_flag() {
|
||||
offset8 as i32
|
||||
} else {
|
||||
-(offset8 as i32)
|
||||
};
|
||||
Some(ArmShiftedValue::ImmediateValue(offset8))
|
||||
},
|
||||
ArmInstructionFormat::LDR_STR_HS_REG => {
|
||||
Some(ArmShiftedValue::ShiftedRegister {
|
||||
reg: (self.raw & 0xf) as usize,
|
||||
shift: ArmShift::ImmediateShift(0, ArmShiftType::LSL),
|
||||
added: Some(self.add_offset_flag())
|
||||
})
|
||||
},
|
||||
_ => None
|
||||
}
|
||||
}
|
||||
|
||||
pub fn operand2(&self) -> ArmShiftedValue {
|
||||
let op2 = self.raw.bit_range(0..12);
|
||||
if self.raw.bit(25) {
|
||||
let immediate = op2 & 0xff;
|
||||
let rotate = 2 * op2.bit_range(8..12);
|
||||
ArmShiftedValue::RotatedImmediate(immediate, rotate)
|
||||
} else {
|
||||
let reg = op2 & 0xf;
|
||||
let shift = ArmShift::try_from(op2).unwrap(); // TODO error handling
|
||||
ArmShiftedValue::ShiftedRegister {
|
||||
reg: reg as usize,
|
||||
shift: shift,
|
||||
added: None,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn register_list(&self) -> Vec<usize> {
|
||||
let list_bits = self.raw & 0xffff;
|
||||
let mut list = Vec::with_capacity(16);
|
||||
for i in 0..16 {
|
||||
if (list_bits & (1 << i)) != 0 {
|
||||
list.push(i)
|
||||
}
|
||||
}
|
||||
list
|
||||
}
|
||||
}
|
||||
|
|
@ -1,7 +1,7 @@
|
|||
use super::super::{reg_string, REG_PC};
|
||||
use super::arm_isa::{
|
||||
ArmCond, ArmInstruction, ArmInstructionFormat, ArmShiftedValue, ArmOpCode, ArmShift,
|
||||
ArmShiftType, ArmHalfwordTransferType
|
||||
use super::{
|
||||
ArmCond, ArmHalfwordTransferType, ArmInstruction, ArmInstructionFormat, ArmOpCode, ArmShift,
|
||||
ArmShiftType, ArmShiftedValue,
|
||||
};
|
||||
use std::fmt;
|
||||
|
||||
|
|
@ -110,7 +110,11 @@ impl ArmInstruction {
|
|||
}
|
||||
|
||||
fn set_cond_mark(&self) -> &str {
|
||||
if self.set_cond_flag() { "s" } else { "" }
|
||||
if self.set_cond_flag() {
|
||||
"s"
|
||||
} else {
|
||||
""
|
||||
}
|
||||
}
|
||||
|
||||
fn fmt_data_processing(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
|
|
@ -145,21 +149,27 @@ impl ArmInstruction {
|
|||
),
|
||||
}?;
|
||||
|
||||
let operand2 = self.operand2();
|
||||
let operand2 = self.operand2().unwrap();
|
||||
match operand2 {
|
||||
ArmShiftedValue::RotatedImmediate(_, _) => {
|
||||
let value = operand2.decode_rotated_immediate().unwrap();
|
||||
write!(f, "#{}\t; {:#x}", value, value)
|
||||
}
|
||||
ArmShiftedValue::ShiftedRegister{reg, shift, added: _} => {
|
||||
write!(f, "{}", self.make_shifted_reg_string(reg, shift))
|
||||
}
|
||||
ArmShiftedValue::ShiftedRegister {
|
||||
reg,
|
||||
shift,
|
||||
added: _,
|
||||
} => write!(f, "{}", self.make_shifted_reg_string(reg, shift)),
|
||||
_ => write!(f, "RegisterNotImpl"),
|
||||
}
|
||||
}
|
||||
|
||||
fn auto_incremenet_mark(&self) -> &str {
|
||||
if self.write_back_flag() { "!" } else { "" }
|
||||
if self.write_back_flag() {
|
||||
"!"
|
||||
} else {
|
||||
""
|
||||
}
|
||||
}
|
||||
|
||||
fn fmt_rn_offset(&self, f: &mut fmt::Formatter, offset: ArmShiftedValue) -> fmt::Result {
|
||||
|
|
@ -176,8 +186,16 @@ impl ArmInstruction {
|
|||
Some(format!("\t; {:#x}", value_for_commnet)),
|
||||
)
|
||||
}
|
||||
ArmShiftedValue::ShiftedRegister{reg, shift, added: Some(added)} => (
|
||||
format!("{}{}", if added { "" } else { "-" }, self.make_shifted_reg_string(reg, shift)),
|
||||
ArmShiftedValue::ShiftedRegister {
|
||||
reg,
|
||||
shift,
|
||||
added: Some(added),
|
||||
} => (
|
||||
format!(
|
||||
"{}{}",
|
||||
if added { "" } else { "-" },
|
||||
self.make_shifted_reg_string(reg, shift)
|
||||
),
|
||||
None,
|
||||
),
|
||||
_ => panic!("bad barrel shifter"),
|
||||
|
|
@ -211,7 +229,7 @@ impl ArmInstruction {
|
|||
Rd = reg_string(self.rd()),
|
||||
)?;
|
||||
|
||||
self.fmt_rn_offset(f, self.ldr_str_offset())
|
||||
self.fmt_rn_offset(f, self.ldr_str_offset().unwrap())
|
||||
}
|
||||
|
||||
fn fmt_ldm_stm(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
|
|
@ -284,7 +302,11 @@ impl ArmInstruction {
|
|||
}
|
||||
|
||||
fn sign_mark(&self) -> &str {
|
||||
if self.u_flag() { "s" } else { "u" }
|
||||
if self.u_flag() {
|
||||
"s"
|
||||
} else {
|
||||
"u"
|
||||
}
|
||||
}
|
||||
|
||||
fn fmt_mull_mlal(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
|
|
|
|||
|
|
@ -1,2 +1,403 @@
|
|||
pub mod arm_isa;
|
||||
pub mod display;
|
||||
|
||||
use crate::bit::BitIndex;
|
||||
use crate::num_traits::FromPrimitive;
|
||||
use std::convert::TryFrom;
|
||||
|
||||
#[derive(Debug, PartialEq)]
|
||||
pub enum ArmDecodeErrorKind {
|
||||
UnknownInstructionFormat,
|
||||
DecodedPartDoesNotBelongToInstruction,
|
||||
UndefinedConditionCode(u32),
|
||||
InvalidShiftType(u32),
|
||||
InvalidHSBits(u32),
|
||||
}
|
||||
use ArmDecodeErrorKind::*;
|
||||
|
||||
#[derive(Debug, PartialEq)]
|
||||
pub struct ArmDecodeError {
|
||||
pub kind: ArmDecodeErrorKind,
|
||||
pub insn: u32,
|
||||
pub addr: u32,
|
||||
}
|
||||
|
||||
impl ArmDecodeError {
|
||||
fn new(kind: ArmDecodeErrorKind, insn: u32, addr: u32) -> ArmDecodeError {
|
||||
ArmDecodeError {
|
||||
kind: kind,
|
||||
insn: insn,
|
||||
addr: addr,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Debug, Copy, Clone, PartialEq, Primitive)]
|
||||
pub enum ArmCond {
|
||||
Equal = 0b0000,
|
||||
NotEqual = 0b0001,
|
||||
UnsignedHigherOrSame = 0b0010,
|
||||
UnsignedLower = 0b0011,
|
||||
Negative = 0b0100,
|
||||
PositiveOrZero = 0b0101,
|
||||
Overflow = 0b0110,
|
||||
NoOverflow = 0b0111,
|
||||
UnsignedHigher = 0b1000,
|
||||
UnsignedLowerOrSame = 0b1001,
|
||||
GreaterOrEqual = 0b1010,
|
||||
LessThan = 0b1011,
|
||||
GreaterThan = 0b1100,
|
||||
LessThanOrEqual = 0b1101,
|
||||
Always = 0b1110,
|
||||
}
|
||||
|
||||
#[derive(Debug, Copy, Clone, PartialEq)]
|
||||
#[allow(non_camel_case_types)]
|
||||
pub enum ArmInstructionFormat {
|
||||
// Branch and Exchange
|
||||
BX,
|
||||
// Branch /w Link
|
||||
B_BL,
|
||||
// Multiply and Multiply-Accumulate
|
||||
MUL_MLA,
|
||||
// Multiply Long and Multiply-Accumulate Long
|
||||
MULL_MLAL,
|
||||
// Single Data Transfer
|
||||
LDR_STR,
|
||||
// Halfword and Signed Data Transfer
|
||||
LDR_STR_HS_REG,
|
||||
// Halfword and Signed Data Transfer
|
||||
LDR_STR_HS_IMM,
|
||||
// Data Processing
|
||||
DP,
|
||||
// Block Data Transfer
|
||||
LDM_STM,
|
||||
// Single Data Swap
|
||||
SWP,
|
||||
// Transfer PSR contents to a register
|
||||
MRS,
|
||||
// Transfer register contents to PSR
|
||||
MSR_REG,
|
||||
// Tanssfer immediate/register to PSR flags only
|
||||
MSR_FLAGS,
|
||||
}
|
||||
|
||||
#[derive(Debug, Primitive)]
|
||||
pub enum ArmOpCode {
|
||||
AND = 0b0000,
|
||||
EOR = 0b0001,
|
||||
SUB = 0b0010,
|
||||
RSB = 0b0011,
|
||||
ADD = 0b0100,
|
||||
ADC = 0b0101,
|
||||
SBC = 0b0110,
|
||||
RSC = 0b0111,
|
||||
TST = 0b1000,
|
||||
TEQ = 0b1001,
|
||||
CMP = 0b1010,
|
||||
CMN = 0b1011,
|
||||
ORR = 0b1100,
|
||||
MOV = 0b1101,
|
||||
BIC = 0b1110,
|
||||
MVN = 0b1111,
|
||||
}
|
||||
|
||||
#[derive(Debug, PartialEq, Primitive)]
|
||||
pub enum ArmHalfwordTransferType {
|
||||
UnsignedHalfwords = 0b01,
|
||||
SignedByte = 0b10,
|
||||
SignedHalfwords = 0b11,
|
||||
}
|
||||
|
||||
#[derive(Debug, Copy, Clone, PartialEq)]
|
||||
pub struct ArmInstruction {
|
||||
pub cond: ArmCond,
|
||||
pub fmt: ArmInstructionFormat,
|
||||
pub raw: u32,
|
||||
pub pc: u32,
|
||||
}
|
||||
|
||||
impl TryFrom<(u32, u32)> for ArmInstruction {
|
||||
type Error = ArmDecodeError;
|
||||
|
||||
fn try_from(value: (u32, u32)) -> Result<Self, Self::Error> {
|
||||
use ArmInstructionFormat::*;
|
||||
let (raw, addr) = value;
|
||||
|
||||
let cond_code = raw.bit_range(28..32) as u8;
|
||||
let cond = match ArmCond::from_u8(cond_code) {
|
||||
Some(cond) => Ok(cond),
|
||||
None => Err(ArmDecodeError::new(
|
||||
UndefinedConditionCode(cond_code as u32),
|
||||
raw,
|
||||
addr,
|
||||
)),
|
||||
}?;
|
||||
|
||||
let fmt = if (0x0fff_fff0 & raw) == 0x012f_ff10 {
|
||||
Ok(BX)
|
||||
} else if (0x0e00_0000 & raw) == 0x0a00_0000 {
|
||||
Ok(B_BL)
|
||||
} else if (0xe000_0010 & raw) == 0x0600_0000 {
|
||||
Err(ArmDecodeError::new(UnknownInstructionFormat, raw, addr))
|
||||
} else if (0x0fb0_0ff0 & raw) == 0x0100_0090 {
|
||||
Ok(SWP)
|
||||
} else if (0x0fc0_00f0 & raw) == 0x0000_0090 {
|
||||
Ok(MUL_MLA)
|
||||
} else if (0x0f80_00f0 & raw) == 0x0080_0090 {
|
||||
Ok(MULL_MLAL)
|
||||
} else if (0x0fbf_0fff & raw) == 0x010f_0000 {
|
||||
Ok(MRS)
|
||||
} else if (0x0fbf_fff0 & raw) == 0x0129_f000 {
|
||||
Ok(MSR_REG)
|
||||
} else if (0x0dbf_f000 & raw) == 0x0128_f000 {
|
||||
Ok(MSR_FLAGS)
|
||||
} else if (0x0c00_0000 & raw) == 0x0400_0000 {
|
||||
Ok(LDR_STR)
|
||||
} else if (0x0e40_0F90 & raw) == 0x0000_0090 {
|
||||
Ok(LDR_STR_HS_REG)
|
||||
} else if (0x0e40_0090 & raw) == 0x0040_0090 {
|
||||
Ok(LDR_STR_HS_IMM)
|
||||
} else if (0x0e00_0000 & raw) == 0x0800_0000 {
|
||||
Ok(LDM_STM)
|
||||
} else if (0x0c00_0000 & raw) == 0x0000_0000 {
|
||||
Ok(DP)
|
||||
} else {
|
||||
Err(ArmDecodeError::new(UnknownInstructionFormat, raw, addr))
|
||||
}?;
|
||||
|
||||
Ok(ArmInstruction {
|
||||
cond: cond,
|
||||
fmt: fmt,
|
||||
raw: raw,
|
||||
pc: addr,
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Debug, PartialEq, Primitive)]
|
||||
pub enum ArmShiftType {
|
||||
LSL = 0,
|
||||
LSR = 1,
|
||||
ASR = 2,
|
||||
ROR = 3,
|
||||
}
|
||||
|
||||
#[derive(Debug, PartialEq)]
|
||||
pub enum ArmShift {
|
||||
ImmediateShift(u32, ArmShiftType),
|
||||
RegisterShift(usize, ArmShiftType),
|
||||
}
|
||||
|
||||
impl TryFrom<u32> for ArmShift {
|
||||
type Error = ArmDecodeErrorKind;
|
||||
|
||||
fn try_from(v: u32) -> Result<Self, Self::Error> {
|
||||
let typ = match ArmShiftType::from_u8(v.bit_range(5..7) as u8) {
|
||||
Some(s) => Ok(s),
|
||||
_ => Err(InvalidShiftType(v.bit_range(5..7))),
|
||||
}?;
|
||||
if v.bit(4) {
|
||||
let rs = v.bit_range(8..12) as usize;
|
||||
Ok(ArmShift::RegisterShift(rs, typ))
|
||||
} else {
|
||||
let amount = v.bit_range(7..12) as u32;
|
||||
Ok(ArmShift::ImmediateShift(amount, typ))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Debug, PartialEq)]
|
||||
pub enum ArmShiftedValue {
|
||||
ImmediateValue(i32),
|
||||
RotatedImmediate(u32, u32),
|
||||
ShiftedRegister {
|
||||
reg: usize,
|
||||
shift: ArmShift,
|
||||
added: Option<bool>,
|
||||
},
|
||||
}
|
||||
|
||||
impl ArmShiftedValue {
|
||||
/// Decode operand2 as an immediate value
|
||||
pub fn decode_rotated_immediate(&self) -> Option<i32> {
|
||||
if let ArmShiftedValue::RotatedImmediate(immediate, rotate) = self {
|
||||
return Some(immediate.rotate_right(*rotate) as i32);
|
||||
}
|
||||
None
|
||||
}
|
||||
}
|
||||
|
||||
impl ArmInstruction {
|
||||
fn make_decode_error(&self, kind: ArmDecodeErrorKind) -> ArmDecodeError {
|
||||
ArmDecodeError {
|
||||
kind: kind,
|
||||
insn: self.raw,
|
||||
addr: self.pc,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn rn(&self) -> usize {
|
||||
match self.fmt {
|
||||
ArmInstructionFormat::MUL_MLA => self.raw.bit_range(12..16) as usize,
|
||||
ArmInstructionFormat::MULL_MLAL => self.raw.bit_range(8..12) as usize,
|
||||
ArmInstructionFormat::BX => self.raw.bit_range(0..4) as usize,
|
||||
_ => self.raw.bit_range(16..20) as usize,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn rd(&self) -> usize {
|
||||
match self.fmt {
|
||||
ArmInstructionFormat::MUL_MLA => self.raw.bit_range(16..20) as usize,
|
||||
_ => self.raw.bit_range(12..16) as usize,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn rm(&self) -> usize {
|
||||
self.raw.bit_range(0..4) as usize
|
||||
}
|
||||
|
||||
pub fn rs(&self) -> usize {
|
||||
self.raw.bit_range(8..12) as usize
|
||||
}
|
||||
|
||||
pub fn rd_lo(&self) -> usize {
|
||||
self.raw.bit_range(12..16) as usize
|
||||
}
|
||||
|
||||
pub fn rd_hi(&self) -> usize {
|
||||
self.raw.bit_range(16..20) as usize
|
||||
}
|
||||
|
||||
pub fn opcode(&self) -> Option<ArmOpCode> {
|
||||
ArmOpCode::from_u32(self.raw.bit_range(21..25))
|
||||
}
|
||||
|
||||
pub fn branch_offset(&self) -> i32 {
|
||||
((((self.raw << 8) as i32) >> 8) << 2) + 8
|
||||
}
|
||||
|
||||
pub fn load_flag(&self) -> bool {
|
||||
self.raw.bit(20)
|
||||
}
|
||||
|
||||
pub fn set_cond_flag(&self) -> bool {
|
||||
self.raw.bit(20)
|
||||
}
|
||||
|
||||
pub fn write_back_flag(&self) -> bool {
|
||||
self.raw.bit(21)
|
||||
}
|
||||
|
||||
pub fn accumulate_flag(&self) -> bool {
|
||||
self.raw.bit(21)
|
||||
}
|
||||
|
||||
pub fn u_flag(&self) -> bool {
|
||||
self.raw.bit(22)
|
||||
}
|
||||
|
||||
pub fn halfword_data_transfer_type(&self) -> Result<ArmHalfwordTransferType, ArmDecodeError> {
|
||||
let bits = (self.raw & 0b1100000) >> 5;
|
||||
match ArmHalfwordTransferType::from_u32(bits) {
|
||||
Some(x) => Ok(x),
|
||||
None => Err(ArmDecodeError::new(InvalidHSBits(bits), self.raw, self.pc)),
|
||||
}
|
||||
}
|
||||
|
||||
pub fn transfer_size(&self) -> usize {
|
||||
if self.raw.bit(22) {
|
||||
1
|
||||
} else {
|
||||
4
|
||||
}
|
||||
}
|
||||
|
||||
pub fn is_loading_psr_and_forcing_user_mode(&self) -> bool {
|
||||
self.raw.bit(22)
|
||||
}
|
||||
|
||||
pub fn spsr_flag(&self) -> bool {
|
||||
self.raw.bit(22)
|
||||
}
|
||||
|
||||
pub fn add_offset_flag(&self) -> bool {
|
||||
self.raw.bit(23)
|
||||
}
|
||||
|
||||
pub fn pre_index_flag(&self) -> bool {
|
||||
self.raw.bit(24)
|
||||
}
|
||||
|
||||
pub fn link_flag(&self) -> bool {
|
||||
self.raw.bit(24)
|
||||
}
|
||||
|
||||
/// gets offset used by ldr/str instructions
|
||||
pub fn ldr_str_offset(&self) -> Result<ArmShiftedValue, ArmDecodeError> {
|
||||
let ofs = self.raw.bit_range(0..12);
|
||||
if self.raw.bit(25) {
|
||||
let rm = ofs & 0xf;
|
||||
let shift = ArmShift::try_from(ofs).map_err(|kind| self.make_decode_error(kind))?;
|
||||
Ok(ArmShiftedValue::ShiftedRegister {
|
||||
reg: rm as usize,
|
||||
shift: shift,
|
||||
added: Some(self.add_offset_flag()),
|
||||
})
|
||||
} else {
|
||||
let ofs = if self.add_offset_flag() {
|
||||
ofs as i32
|
||||
} else {
|
||||
-(ofs as i32)
|
||||
};
|
||||
Ok(ArmShiftedValue::ImmediateValue(ofs))
|
||||
}
|
||||
}
|
||||
|
||||
pub fn ldr_str_hs_offset(&self) -> Result<ArmShiftedValue, ArmDecodeError> {
|
||||
match self.fmt {
|
||||
ArmInstructionFormat::LDR_STR_HS_IMM => {
|
||||
let offset8 = (self.raw.bit_range(8..12) << 4) + self.raw.bit_range(0..4);
|
||||
let offset8 = if self.add_offset_flag() {
|
||||
offset8 as i32
|
||||
} else {
|
||||
-(offset8 as i32)
|
||||
};
|
||||
Ok(ArmShiftedValue::ImmediateValue(offset8))
|
||||
}
|
||||
ArmInstructionFormat::LDR_STR_HS_REG => Ok(ArmShiftedValue::ShiftedRegister {
|
||||
reg: (self.raw & 0xf) as usize,
|
||||
shift: ArmShift::ImmediateShift(0, ArmShiftType::LSL),
|
||||
added: Some(self.add_offset_flag()),
|
||||
}),
|
||||
_ => Err(self.make_decode_error(DecodedPartDoesNotBelongToInstruction)),
|
||||
}
|
||||
}
|
||||
|
||||
pub fn operand2(&self) -> Result<ArmShiftedValue, ArmDecodeError> {
|
||||
let op2 = self.raw.bit_range(0..12);
|
||||
if self.raw.bit(25) {
|
||||
let immediate = op2 & 0xff;
|
||||
let rotate = 2 * op2.bit_range(8..12);
|
||||
Ok(ArmShiftedValue::RotatedImmediate(immediate, rotate))
|
||||
} else {
|
||||
let reg = op2 & 0xf;
|
||||
let shift = ArmShift::try_from(op2).map_err(|kind| self.make_decode_error(kind))?; // TODO error handling
|
||||
Ok(ArmShiftedValue::ShiftedRegister {
|
||||
reg: reg as usize,
|
||||
shift: shift,
|
||||
added: None,
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
pub fn register_list(&self) -> Vec<usize> {
|
||||
let list_bits = self.raw & 0xffff;
|
||||
let mut list = Vec::with_capacity(16);
|
||||
for i in 0..16 {
|
||||
if (list_bits & (1 << i)) != 0 {
|
||||
list.push(i)
|
||||
}
|
||||
}
|
||||
list
|
||||
}
|
||||
}
|
||||
|
|
|
|||
108
src/arm7tdmi/cpu.rs
Normal file
108
src/arm7tdmi/cpu.rs
Normal file
|
|
@ -0,0 +1,108 @@
|
|||
use crate::num_traits::FromPrimitive;
|
||||
|
||||
use super::arm::*;
|
||||
use super::sysbus::SysBus;
|
||||
|
||||
#[derive(Debug, PartialEq)]
|
||||
pub enum CpuError {
|
||||
IllegalInstruction,
|
||||
}
|
||||
|
||||
pub type CpuResult<T> = Result<T, CpuError>;
|
||||
|
||||
#[derive(Debug, PartialEq)]
|
||||
pub enum CpuState {
|
||||
ARM,
|
||||
THUMB,
|
||||
}
|
||||
|
||||
#[derive(Debug, Primitive)]
|
||||
#[repr(u8)]
|
||||
enum CpuMode {
|
||||
User = 0b10000,
|
||||
Fiq = 0b10001,
|
||||
Irq = 0b10010,
|
||||
Supervisor = 0b10011,
|
||||
Abort = 0b10111,
|
||||
Undefined = 0b11011,
|
||||
System = 0b11111,
|
||||
}
|
||||
|
||||
pub struct CpuModeContext {
|
||||
// r8-r14
|
||||
banked_gpr: [u32; 7],
|
||||
spsr: u32,
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
pub struct Core {
|
||||
pc: u32,
|
||||
// r0-r7
|
||||
gpr: [u32; 8],
|
||||
cpsr: u32,
|
||||
|
||||
mode: CpuMode,
|
||||
state: CpuState,
|
||||
}
|
||||
|
||||
impl Core {
|
||||
pub fn new() -> Core {
|
||||
Core {
|
||||
pc: 0,
|
||||
gpr: [0; 8],
|
||||
cpsr: 0,
|
||||
mode: CpuMode::System,
|
||||
state: CpuState::ARM,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn get_reg(&self, reg_num: usize) -> u32 {
|
||||
match reg_num {
|
||||
0...7 => self.gpr[reg_num],
|
||||
15 => self.pc,
|
||||
_ => unimplemented!("TODO banked registers"),
|
||||
}
|
||||
}
|
||||
|
||||
pub fn set_reg(&mut self, reg_num: usize, val: u32) {
|
||||
match reg_num {
|
||||
0...7 => self.gpr[reg_num] = val,
|
||||
15 => self.pc = val,
|
||||
_ => unimplemented!("TODO banked registers"),
|
||||
}
|
||||
}
|
||||
|
||||
/// Resets the cpu
|
||||
pub fn reset(&mut self) {
|
||||
self.pc = 0;
|
||||
self.cpsr = 0;
|
||||
self.mode = CpuMode::System;
|
||||
self.state = CpuState::ARM;
|
||||
}
|
||||
|
||||
fn word_size(&self) -> usize {
|
||||
match self.state {
|
||||
CpuState::ARM => 4,
|
||||
CpuState::THUMB => 2,
|
||||
}
|
||||
}
|
||||
|
||||
fn advance_pc(&mut self) {
|
||||
self.pc = self.pc.wrapping_add(self.word_size() as u32)
|
||||
}
|
||||
|
||||
fn step_arm(&mut self, sysbus: &mut SysBus) -> CpuResult<()> {
|
||||
Err(CpuError::IllegalInstruction)
|
||||
}
|
||||
|
||||
pub fn step(&mut self, sysbus: &mut SysBus) -> CpuResult<()> {
|
||||
match self.state {
|
||||
CpuState::ARM => self.step_arm(sysbus)?,
|
||||
CpuState::THUMB => unimplemented!("thumb not implemented :("),
|
||||
};
|
||||
|
||||
self.advance_pc();
|
||||
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
|
@ -1,12 +1,13 @@
|
|||
pub mod arm;
|
||||
pub use arm::arm_isa::ArmInstruction;
|
||||
pub mod cpu;
|
||||
pub use super::sysbus;
|
||||
|
||||
pub const REG_PC: usize = 15;
|
||||
|
||||
pub fn reg_string(reg: usize) -> &'static str {
|
||||
let reg_names = &[
|
||||
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "fp", "ip", "sp",
|
||||
"lr", "pc",
|
||||
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "fp", "ip", "sp", "lr",
|
||||
"pc",
|
||||
];
|
||||
reg_names[reg]
|
||||
}
|
||||
|
|
|
|||
20
src/cli.yml
Normal file
20
src/cli.yml
Normal file
|
|
@ -0,0 +1,20 @@
|
|||
name: rustboyadvance
|
||||
author: Michel Heily <michelheily@gmail.com>
|
||||
about: Game boy advance emulator
|
||||
subcommands:
|
||||
- debug:
|
||||
about: debug the bios with the arm core emulation
|
||||
args:
|
||||
- BIOS:
|
||||
help: Sets the bios file to use
|
||||
required: false
|
||||
default_value: gba_bios.bin
|
||||
index: 1
|
||||
- disass:
|
||||
about: disassemble an arm binary file
|
||||
args:
|
||||
- INPUT:
|
||||
help: Sets the input file to use
|
||||
required: true
|
||||
index: 1
|
||||
|
||||
|
|
@ -1,69 +0,0 @@
|
|||
use std::env;
|
||||
use std::io;
|
||||
use std::io::Cursor;
|
||||
use std::io::prelude::*;
|
||||
use std::fs::File;
|
||||
use std::convert::TryFrom;
|
||||
|
||||
#[macro_use]
|
||||
extern crate enum_primitive_derive;
|
||||
extern crate num_traits;
|
||||
|
||||
extern crate bit;
|
||||
|
||||
extern crate byteorder;
|
||||
use byteorder::{LittleEndian, ReadBytesExt};
|
||||
|
||||
mod arm7tdmi;
|
||||
use arm7tdmi::ArmInstruction;
|
||||
|
||||
#[derive(Debug)]
|
||||
pub enum DisassemblerError {
|
||||
IO(io::Error),
|
||||
}
|
||||
|
||||
impl From<io::Error> for DisassemblerError {
|
||||
fn from(err: io::Error) -> DisassemblerError {
|
||||
DisassemblerError::IO(err)
|
||||
}
|
||||
}
|
||||
|
||||
fn read_file(filename: &str) -> Result<Vec<u8>, DisassemblerError> {
|
||||
let mut buf = Vec::new();
|
||||
let mut file = File::open(filename)?;
|
||||
file.read_to_end(&mut buf)?;
|
||||
Ok(buf)
|
||||
}
|
||||
|
||||
fn main() {
|
||||
let filename = match env::args().nth(1) {
|
||||
Some(filename) => filename,
|
||||
None => panic!("usage: {} <file> <n>", env::args().nth(0).unwrap())
|
||||
};
|
||||
|
||||
// let num_instructions = match env::args().nth(2) {
|
||||
// Some(n) => n,
|
||||
// None => panic!("usage: {} <file> <n>", env::args().nth(0).unwrap())
|
||||
// }.parse::<usize>();
|
||||
|
||||
let buf = match read_file(&filename) {
|
||||
Ok(buf) => buf,
|
||||
Err(e) => panic!(e)
|
||||
};
|
||||
|
||||
let mut rdr = Cursor::new(buf);
|
||||
loop {
|
||||
let value: u32 = match rdr.read_u32::<LittleEndian>() {
|
||||
Ok(v) => v,
|
||||
Err(err) => {
|
||||
panic!("got an error {:?}", err);
|
||||
}
|
||||
};
|
||||
let addr = (rdr.position() - 4) as u32;
|
||||
print!("{:8x}:\t{:08x} \t", addr, value);
|
||||
match ArmInstruction::try_from((value, addr)) {
|
||||
Ok(insn) => println!("{}", insn),
|
||||
Err(_) => println!("<UNDEFINED>")
|
||||
}
|
||||
}
|
||||
}
|
||||
111
src/main.rs
111
src/main.rs
|
|
@ -1,3 +1,110 @@
|
|||
fn main() {
|
||||
println!("Hello, world!");
|
||||
use std::convert::TryFrom;
|
||||
use std::fs::File;
|
||||
use std::io;
|
||||
use std::io::prelude::*;
|
||||
use std::io::ErrorKind;
|
||||
|
||||
#[macro_use]
|
||||
extern crate enum_primitive_derive;
|
||||
extern crate num_traits;
|
||||
|
||||
extern crate bit;
|
||||
|
||||
extern crate byteorder;
|
||||
use byteorder::{LittleEndian, ReadBytesExt};
|
||||
|
||||
#[macro_use]
|
||||
extern crate clap;
|
||||
use clap::{App, ArgMatches};
|
||||
|
||||
pub mod sysbus;
|
||||
use sysbus::SysBus;
|
||||
mod arm7tdmi;
|
||||
use arm7tdmi::arm;
|
||||
use arm7tdmi::cpu;
|
||||
|
||||
#[derive(Debug)]
|
||||
pub enum GBAError {
|
||||
IO(io::Error),
|
||||
ArmDecodeError(arm::ArmDecodeError),
|
||||
CpuError(cpu::CpuError),
|
||||
}
|
||||
|
||||
pub type GBAResult<T> = Result<T, GBAError>;
|
||||
|
||||
impl From<io::Error> for GBAError {
|
||||
fn from(err: io::Error) -> GBAError {
|
||||
GBAError::IO(err)
|
||||
}
|
||||
}
|
||||
|
||||
impl From<arm::ArmDecodeError> for GBAError {
|
||||
fn from(err: arm::ArmDecodeError) -> GBAError {
|
||||
GBAError::ArmDecodeError(err)
|
||||
}
|
||||
}
|
||||
|
||||
impl From<cpu::CpuError> for GBAError {
|
||||
fn from(err: cpu::CpuError) -> GBAError {
|
||||
GBAError::CpuError(err)
|
||||
}
|
||||
}
|
||||
|
||||
fn read_bin_file(filename: &str) -> GBAResult<Vec<u8>> {
|
||||
let mut buf = Vec::new();
|
||||
let mut file = File::open(filename)?;
|
||||
file.read_to_end(&mut buf)?;
|
||||
Ok(buf)
|
||||
}
|
||||
|
||||
fn run_disass(matches: &ArgMatches) -> GBAResult<()> {
|
||||
let input = matches.value_of("INPUT").unwrap();
|
||||
let bin = read_bin_file(&input)?;
|
||||
|
||||
let mut rdr = io::Cursor::new(bin);
|
||||
loop {
|
||||
let value: u32 = match rdr.read_u32::<LittleEndian>() {
|
||||
Ok(value) => Ok(value),
|
||||
Err(e) => match e.kind() {
|
||||
ErrorKind::UnexpectedEof => {
|
||||
break;
|
||||
}
|
||||
_ => Err(e),
|
||||
},
|
||||
}?;
|
||||
let addr = (rdr.position() - 4) as u32;
|
||||
print!("{:8x}:\t{:08x} \t", addr, value);
|
||||
match arm::ArmInstruction::try_from((value, addr)) {
|
||||
Ok(insn) => println!("{}", insn),
|
||||
Err(_) => println!("<UNDEFINED>"),
|
||||
};
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn run_debug(matches: &ArgMatches) -> GBAResult<()> {
|
||||
let gba_bios_path = matches.value_of("BIOS").unwrap_or_default();
|
||||
println!("Loading BIOS: {}", gba_bios_path);
|
||||
let bios_bin = read_bin_file(gba_bios_path)?;
|
||||
|
||||
let sysbus = SysBus::new(bios_bin);
|
||||
let core = cpu::Core::new();
|
||||
|
||||
unimplemented!()
|
||||
}
|
||||
|
||||
fn main() {
|
||||
let yaml = load_yaml!("cli.yml");
|
||||
let matches = App::from_yaml(yaml).get_matches();
|
||||
|
||||
let result = match matches.subcommand() {
|
||||
("debug", Some(m)) => run_debug(m),
|
||||
("disass", Some(m)) => run_disass(m),
|
||||
_ => Ok(()),
|
||||
};
|
||||
|
||||
if let Err(err) = result {
|
||||
println!("Got an error: {:?}", err);
|
||||
}
|
||||
}
|
||||
|
|
|
|||
34
src/sysbus.rs
Normal file
34
src/sysbus.rs
Normal file
|
|
@ -0,0 +1,34 @@
|
|||
use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
|
||||
|
||||
const VIDEO_RAM_SIZE: usize = 128 * 1024;
|
||||
const WORK_RAM_SIZE: usize = 256 * 1024;
|
||||
const INTERNAL_RAM: usize = 32 * 1024;
|
||||
const PALETTE_AM_SIZE: usize = 1 * 1024;
|
||||
const OAM_SIZE: usize = 1 * 1024;
|
||||
const BIOS_SIZE: usize = 16 * 1024;
|
||||
const GAMEPAK_ROM_SIZE: usize = 32 * 1024 * 1024;
|
||||
|
||||
#[derive(Debug)]
|
||||
pub struct SysBus {
|
||||
bios_rom: Vec<u8>,
|
||||
}
|
||||
|
||||
impl SysBus {
|
||||
pub fn new(bios_rom: Vec<u8>) -> SysBus {
|
||||
SysBus { bios_rom: bios_rom }
|
||||
}
|
||||
|
||||
pub fn read_32(&self, addr: u32) -> u32 {
|
||||
let addr = addr as usize;
|
||||
(&self.bios_rom[addr..addr + 4])
|
||||
.read_u32::<LittleEndian>()
|
||||
.unwrap()
|
||||
}
|
||||
|
||||
pub fn read_16(&self, addr: u32) -> u16 {
|
||||
let addr = addr as usize;
|
||||
(&self.bios_rom[addr..addr + 4])
|
||||
.read_u16::<LittleEndian>()
|
||||
.unwrap()
|
||||
}
|
||||
}
|
||||
Reference in a new issue