feat: add v5te arm and thumb namespaces

also, drop the comptime parameter from arm and thumb namespaces
This commit is contained in:
Rekai Nyangadzayi Musuka 2023-07-17 23:16:31 -05:00
parent 2af9c351bc
commit 96a3a45d9b
3 changed files with 441 additions and 210 deletions

View File

@ -40,8 +40,15 @@ pub fn Arm32(comptime arch: Architecture) type {
bank: Bank = Bank.create(),
const arm = @import("arm/v4t.zig").arm(Self);
const thumb = @import("arm/v4t.zig").thumb(Self);
const arm = switch (arch) {
.v4t => @import("arm/v4t.zig").arm,
.v5te => @import("arm/v5te.zig").arm,
};
const thumb = switch (arch) {
.v4t => @import("arm/v4t.zig").thumb,
.v5te => @import("arm/v5te.zig").thumb,
};
const Pipeline = struct {
stage: [2]?u32,

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@ -1,8 +1,8 @@
const Bus = @import("../lib.zig").Bus;
const Arm7tdmi = @import("../arm.zig").Arm32(.v4t);
pub fn arm(comptime Arm32: type) type {
return struct {
pub const InstrFn = *const fn (*Arm32, Bus, u32) void;
pub const arm = struct {
pub const InstrFn = *const fn (*Arm7tdmi, Bus, u32) void;
pub const lut: [0x1000]InstrFn = populate();
const processing = @import("cpu/arm/data_processing.zig").dataProcessing;
@ -25,7 +25,7 @@ pub fn arm(comptime Arm32: type) type {
}
// Undefined ARM Instruction handler
fn und(cpu: *Arm32, _: Bus, opcode: u32) void {
fn und(cpu: *Arm7tdmi, _: Bus, opcode: u32) void {
const id = idx(opcode);
cpu.panic("[CPU/Decode] ID: 0x{X:0>3} 0x{X:0>8} is an illegal opcode", .{ id, opcode });
}
@ -102,11 +102,9 @@ pub fn arm(comptime Arm32: type) type {
};
}
};
}
pub fn thumb(comptime Arm32: type) type {
return struct {
pub const InstrFn = *const fn (*Arm32, Bus, u16) void;
pub const thumb = struct {
pub const InstrFn = *const fn (*Arm7tdmi, Bus, u16) void;
pub const lut: [0x400]InstrFn = populate();
const processing = @import("cpu/thumb/data_processing.zig");
@ -122,7 +120,7 @@ pub fn thumb(comptime Arm32: type) type {
}
/// Undefined THUMB Instruction Handler
fn und(cpu: *Arm32, _: Bus, opcode: u16) void {
fn und(cpu: *Arm7tdmi, _: Bus, opcode: u16) void {
const id = idx(opcode);
cpu.panic("[CPU/Decode] ID: 0b{b:0>10} 0x{X:0>2} is an illegal opcode", .{ id, opcode });
}
@ -227,4 +225,3 @@ pub fn thumb(comptime Arm32: type) type {
};
}
};
}

227
src/arm/v5te.zig Normal file
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@ -0,0 +1,227 @@
const Bus = @import("../lib.zig").Bus;
const Arm946es = @import("../arm.zig").Arm32(.v5te);
pub const arm = struct {
pub const InstrFn = *const fn (*Arm946es, Bus, u32) void;
pub const lut: [0x1000]InstrFn = populate();
const processing = @import("cpu/arm/data_processing.zig").dataProcessing;
const psrTransfer = @import("cpu/arm/psr_transfer.zig").psrTransfer;
const transfer = @import("cpu/arm/single_data_transfer.zig").singleDataTransfer;
const halfSignedTransfer = @import("cpu/arm/half_signed_data_transfer.zig").halfAndSignedDataTransfer;
const blockTransfer = @import("cpu/arm/block_data_transfer.zig").blockDataTransfer;
const branch = @import("cpu/arm/branch.zig").branch;
const branchExchange = @import("cpu/arm/branch.zig").branchAndExchange;
const swi = @import("cpu/arm/software_interrupt.zig").armSoftwareInterrupt;
const swap = @import("cpu/arm/single_data_swap.zig").singleDataSwap;
const multiply = @import("cpu/arm/multiply.zig").multiply;
const multiplyLong = @import("cpu/arm/multiply.zig").multiplyLong;
/// Determine index into ARM InstrFn LUT
pub fn idx(opcode: u32) u12 {
// FIXME: omit these?
return @as(u12, @truncate(opcode >> 20 & 0xFF)) << 4 | @as(u12, @truncate(opcode >> 4 & 0xF));
}
// Undefined ARM Instruction handler
fn und(cpu: *Arm946es, _: Bus, opcode: u32) void {
const id = idx(opcode);
cpu.panic("[CPU/Decode] ID: 0x{X:0>3} 0x{X:0>8} is an illegal opcode", .{ id, opcode });
}
fn populate() [0x1000]InstrFn {
return comptime comptime_blk: {
@setEvalBranchQuota(0xE000);
var table = [_]InstrFn{und} ** 0x1000;
for (&table, 0..) |*handler, i| {
handler.* = switch (@as(u2, i >> 10)) {
0b00 => if (i == 0x121) blk: {
break :blk branchExchange(InstrFn);
} else if (i & 0xFCF == 0x009) blk: {
const A = i >> 5 & 1 == 1;
const S = i >> 4 & 1 == 1;
break :blk multiply(InstrFn, A, S);
} else if (i & 0xFBF == 0x109) blk: {
const B = i >> 6 & 1 == 1;
break :blk swap(InstrFn, B);
} else if (i & 0xF8F == 0x089) blk: {
const U = i >> 6 & 1 == 1;
const A = i >> 5 & 1 == 1;
const S = i >> 4 & 1 == 1;
break :blk multiplyLong(InstrFn, U, A, S);
} else if (i & 0xE49 == 0x009 or i & 0xE49 == 0x049) blk: {
const P = i >> 8 & 1 == 1;
const U = i >> 7 & 1 == 1;
const I = i >> 6 & 1 == 1;
const W = i >> 5 & 1 == 1;
const L = i >> 4 & 1 == 1;
break :blk halfSignedTransfer(InstrFn, P, U, I, W, L);
} else if (i & 0xD90 == 0x100) blk: {
const I = i >> 9 & 1 == 1;
const R = i >> 6 & 1 == 1;
const kind = i >> 4 & 0x3;
break :blk psrTransfer(InstrFn, I, R, kind);
} else blk: {
const I = i >> 9 & 1 == 1;
const S = i >> 4 & 1 == 1;
const instrKind = i >> 5 & 0xF;
break :blk processing(InstrFn, I, S, instrKind);
},
0b01 => if (i >> 9 & 1 == 1 and i & 1 == 1) und else blk: {
const I = i >> 9 & 1 == 1;
const P = i >> 8 & 1 == 1;
const U = i >> 7 & 1 == 1;
const B = i >> 6 & 1 == 1;
const W = i >> 5 & 1 == 1;
const L = i >> 4 & 1 == 1;
break :blk transfer(InstrFn, I, P, U, B, W, L);
},
else => switch (@as(u2, i >> 9 & 0x3)) {
// MSB is guaranteed to be 1
0b00 => blk: {
const P = i >> 8 & 1 == 1;
const U = i >> 7 & 1 == 1;
const S = i >> 6 & 1 == 1;
const W = i >> 5 & 1 == 1;
const L = i >> 4 & 1 == 1;
break :blk blockTransfer(InstrFn, P, U, S, W, L);
},
0b01 => blk: {
const L = i >> 8 & 1 == 1;
break :blk branch(InstrFn, L);
},
0b10 => und, // COP Data Transfer
0b11 => if (i >> 8 & 1 == 1) swi(InstrFn) else und, // COP Data Operation + Register Transfer
},
};
}
break :comptime_blk table;
};
}
};
pub const thumb = struct {
pub const InstrFn = *const fn (*Arm946es, Bus, u16) void;
pub const lut: [0x400]InstrFn = populate();
const processing = @import("cpu/thumb/data_processing.zig");
const alu = @import("cpu/thumb/alu.zig").fmt4;
const transfer = @import("cpu/thumb/data_transfer.zig");
const block_transfer = @import("cpu/thumb/block_data_transfer.zig");
const swi = @import("cpu/thumb/software_interrupt.zig").fmt17;
const branch = @import("cpu/thumb/branch.zig");
/// Determine index into THUMB InstrFn LUT
pub fn idx(opcode: u16) u10 {
return @truncate(opcode >> 6);
}
/// Undefined THUMB Instruction Handler
fn und(cpu: *Arm946es, _: Bus, opcode: u16) void {
const id = idx(opcode);
cpu.panic("[CPU/Decode] ID: 0b{b:0>10} 0x{X:0>2} is an illegal opcode", .{ id, opcode });
}
fn populate() [0x400]InstrFn {
return comptime comptime_blk: {
@setEvalBranchQuota(5025); // This is exact
var table = [_]InstrFn{und} ** 0x400;
for (&table, 0..) |*handler, i| {
handler.* = switch (@as(u3, i >> 7 & 0x7)) {
0b000 => if (i >> 5 & 0x3 == 0b11) blk: {
const I = i >> 4 & 1 == 1;
const is_sub = i >> 3 & 1 == 1;
const rn = i & 0x7;
break :blk processing.fmt2(InstrFn, I, is_sub, rn);
} else blk: {
const op = i >> 5 & 0x3;
const offset = i & 0x1F;
break :blk processing.fmt1(InstrFn, op, offset);
},
0b001 => blk: {
const op = i >> 5 & 0x3;
const rd = i >> 2 & 0x7;
break :blk processing.fmt3(InstrFn, op, rd);
},
0b010 => switch (@as(u2, i >> 5 & 0x3)) {
0b00 => if (i >> 4 & 1 == 1) blk: {
const op = i >> 2 & 0x3;
const h1 = i >> 1 & 1;
const h2 = i & 1;
break :blk processing.fmt5(InstrFn, op, h1, h2);
} else blk: {
const op = i & 0xF;
break :blk alu(InstrFn, op);
},
0b01 => blk: {
const rd = i >> 2 & 0x7;
break :blk transfer.fmt6(InstrFn, rd);
},
else => blk: {
const op = i >> 4 & 0x3;
const T = i >> 3 & 1 == 1;
break :blk transfer.fmt78(InstrFn, op, T);
},
},
0b011 => blk: {
const B = i >> 6 & 1 == 1;
const L = i >> 5 & 1 == 1;
const offset = i & 0x1F;
break :blk transfer.fmt9(InstrFn, B, L, offset);
},
else => switch (@as(u3, i >> 6 & 0x7)) {
// MSB is guaranteed to be 1
0b000 => blk: {
const L = i >> 5 & 1 == 1;
const offset = i & 0x1F;
break :blk transfer.fmt10(InstrFn, L, offset);
},
0b001 => blk: {
const L = i >> 5 & 1 == 1;
const rd = i >> 2 & 0x7;
break :blk transfer.fmt11(InstrFn, L, rd);
},
0b010 => blk: {
const isSP = i >> 5 & 1 == 1;
const rd = i >> 2 & 0x7;
break :blk processing.fmt12(InstrFn, isSP, rd);
},
0b011 => if (i >> 4 & 1 == 1) blk: {
const L = i >> 5 & 1 == 1;
const R = i >> 2 & 1 == 1;
break :blk block_transfer.fmt14(InstrFn, L, R);
} else blk: {
const S = i >> 1 & 1 == 1;
break :blk processing.fmt13(InstrFn, S);
},
0b100 => blk: {
const L = i >> 5 & 1 == 1;
const rb = i >> 2 & 0x7;
break :blk block_transfer.fmt15(InstrFn, L, rb);
},
0b101 => if (i >> 2 & 0xF == 0b1111) blk: {
break :blk swi(InstrFn);
} else blk: {
const cond = i >> 2 & 0xF;
break :blk branch.fmt16(InstrFn, cond);
},
0b110 => branch.fmt18(
InstrFn,
),
0b111 => blk: {
const is_low = i >> 5 & 1 == 1;
break :blk branch.fmt19(InstrFn, is_low);
},
},
};
}
break :comptime_blk table;
};
}
};