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twoapple-reboot/test/test_bus.d

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module test.test_bus;
import std.algorithm, std.array, std.conv, std.exception, std.stdio,
std.string;
import test.base, test.cpu, test.opcodes;
T[] If(alias cond, T)(T[] actions)
{
if (cond)
return actions;
else
return [];
}
/// Bus access pattern for register opcodes.
auto accesses_reg(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc];
assert(REG_OPS!T.canFind(opcode));
cycles = 2;
return [Bus(Action.READ, pc)] ~
If!(isStrict!T)(
[Bus(Action.READ, pc+1)]);
}
/// Bus access pattern for push opcodes.
auto accesses_push(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc];
assert(PUSH_OPS!T.canFind(opcode));
auto sp = getSP(cpu);
cycles = 3;
return [Bus(Action.READ, pc)] ~
If!(isStrict!T)(
[Bus(Action.READ, pc+1)]) ~
[Bus(Action.WRITE, sp)];
}
/// Bus access pattern for pull opcodes.
auto accesses_pull(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc];
assert(PULL_OPS!T.canFind(opcode));
auto sp = getSP(cpu);
auto sp1 = pageWrapAdd(sp, 1);
cycles = 4;
return [Bus(Action.READ, pc)] ~
If!(isStrict!T)(
[Bus(Action.READ, pc+1),
Bus(Action.READ, sp)]) ~
[Bus(Action.READ, sp1)];
}
/// Bus access pattern for immediate mode opcodes.
auto accesses_imm(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc];
assert(IMM_OPS!T.canFind(opcode));
bool decimal = isCMOS!T && getFlag(cpu, Flag.D) &&
BCD_OPS!T.canFind(opcode);
cycles = 2 + decimal;
return [Bus(Action.READ, pc),
Bus(Action.READ, pc+1)] ~
If!decimal(If!(isStrict!T)(
[Bus(Action.READ, pc+2)]));
}
/// Bus access pattern for branch opcodes.
auto accesses_rel(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc], op1 = mem[pc+1];
assert(BRANCH_OPS!T.canFind(opcode));
auto base = cast(ushort)(pc + 2);
bool branch = wouldBranch(cpu, opcode);
ushort wrongPage = pageWrapAdd(base, cast(byte)op1);
bool px = wrongPage != pageCrossAdd(base, cast(byte)op1);
ushort wrongAddr = isNMOS!T ? wrongPage : base;
cycles = 2 + branch + px;
return [Bus(Action.READ, pc),
Bus(Action.READ, pc+1)] ~
If!branch(If!(isStrict!T)(
[Bus(Action.READ, pc+2)] ~
If!px(
[Bus(Action.READ, wrongAddr)])));
}
/// Bus access pattern for zeropage mode opcodes.
auto accesses_zpg(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc], op1 = mem[pc+1];
assert(ZPG_OPS!T.canFind(opcode));
cycles = 2; // + accesses_end
return [Bus(Action.READ, pc),
Bus(Action.READ, pc+1)] ~
accesses_end(cpu, opcode, 2, op1, cycles);
}
/// Bus access pattern for absolute mode opcodes.
auto accesses_abs(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc], op1 = mem[pc+1], op2 = mem[pc+2];
assert(ABS_OPS!T.canFind(opcode));
auto addr = address(op1, op2);
cycles = 3; // + accesses_end
return [Bus(Action.READ, pc),
Bus(Action.READ, pc+1),
Bus(Action.READ, pc+2)] ~
accesses_end(cpu, opcode, 3, addr, cycles);
}
/// Bus access pattern for zeropage,x/y mode opcodes.
auto accesses_zpxy(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc], op1 = mem[pc+1];
bool useX = ZPX_OPS!T.canFind(opcode);
assert(useX || ZPY_OPS!T.canFind(opcode));
auto idx = (useX ? getX(cpu) : getY(cpu));
auto addr = pageWrapAdd(op1, idx);
cycles = 3; // + accesses_end
return [Bus(Action.READ, pc),
Bus(Action.READ, pc+1)] ~
If!(isStrict!T)(
If!(isNMOS!T)(
[Bus(Action.READ, op1)]) ~
If!(isCMOS!T)(
[Bus(Action.READ, pc+2)])) ~ // XXX
accesses_end(cpu, opcode, 2, addr, cycles);
/*
* According to "Understanding the Apple IIe", the extra read on
* the 65C02 (marked XXX above) is the address of the last operand
* byte (pc + 1).
*/
}
/// Bus access pattern for absolute,x/y mode opcodes.
auto accesses_abxy(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc];
auto op1 = mem[pc+1], op2 = mem[pc+2];
bool useX = ABX_OPS!T.canFind(opcode);
assert(useX || ABY_OPS!T.canFind(opcode));
auto idx = useX ? getX(cpu) : getY(cpu);
auto base = address(op1, op2);
auto guess = pageWrapAdd(base, idx);
auto addr = pageCrossAdd(base, idx);
cycles = 3; // + accesses_px + accesses_end
return [Bus(Action.READ, pc),
Bus(Action.READ, pc+1),
Bus(Action.READ, pc+2)] ~
accesses_px(cpu, opcode, 3, guess, addr, cycles) ~
accesses_end(cpu, opcode, 3, addr, cycles);
}
/// Bus access pattern for indirect zeropage,x mode opcodes.
auto accesses_izx(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc], op1 = mem[pc+1];
assert(IZX_OPS!T.canFind(opcode));
auto idx = getX(cpu);
auto ial = pageWrapAdd(op1, idx);
auto iah = pageWrapAdd(ial, 1);
auto addr = address(mem[ial], mem[iah]);
cycles = 5; // + accesses_end
return [Bus(Action.READ, pc),
Bus(Action.READ, pc+1)] ~
If!(isStrict!T)(
If!(isNMOS!T)(
[Bus(Action.READ, op1)]) ~
If!(isCMOS!T)(
[Bus(Action.READ, pc+2)])) ~ // XXX
[Bus(Action.READ, ial),
Bus(Action.READ, iah)] ~
accesses_end(cpu, opcode, 2, addr, cycles);
/*
* According to "Understanding the Apple IIe", the extra read on
* the 65C02 (marked XXX above) is the address of the last operand
* byte (pc + 1).
*/
}
/// Bus access pattern for indirect zeropage,y mode opcodes.
auto accesses_izy(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc], op1 = mem[pc+1];
assert(IZY_OPS!T.canFind(opcode));
auto idx = getY(cpu);
auto ial = op1;
auto iah = pageWrapAdd(ial, 1);
auto base = address(mem[ial], mem[iah]);
auto guess = pageWrapAdd(base, idx);
auto addr = pageCrossAdd(base, idx);
cycles = 4; // + accesses_px + accesses_end
return [Bus(Action.READ, pc),
Bus(Action.READ, pc+1),
Bus(Action.READ, ial),
Bus(Action.READ, iah)] ~
accesses_px(cpu, opcode, 2, guess, addr, cycles) ~
accesses_end(cpu, opcode, 2, addr, cycles);
}
/// Bus access pattern for indirect zeropage mode opcodes.
auto accesses_zpi(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T && isCMOS!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc], op1 = mem[pc+1];
assert(ZPI_OPS!T.canFind(opcode));
auto ial = op1;
auto iah = pageWrapAdd(ial, 1);
auto addr = address(mem[ial], mem[iah]);
cycles = 4; // + accesses_end
return [Bus(Action.READ, pc),
Bus(Action.READ, pc+1),
Bus(Action.READ, ial),
Bus(Action.READ, iah)] ~
accesses_end(cpu, opcode, 2, addr, cycles);
}
/// Bus access pattern for NMOS HLT opcodes.
auto accesses_hlt(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T && isNMOS!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc];
assert(HLT_OPS!T.canFind(opcode));
cycles = 1;
return [Bus(Action.READ, pc)];
}
/// Bus access pattern for 1-cycle NOPs.
auto accesses_nop1(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T && isCMOS!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc];
assert(NOP1_OPS!T.canFind(opcode));
cycles = 1;
return [Bus(Action.READ, pc)];
}
auto accesses_px(T)(T cpu, ubyte opcode, int opLen, ushort guess, ushort right,
ref int cycles)
if (isCpu!T)
{
auto pc = getPC(cpu);
bool noShortcut = WRITE_OPS!T.canFind(opcode) ||
(isNMOS!T ? (RMW_OPS!T.canFind(opcode))
: (opcode == 0xDE || opcode == 0xFE));
if (guess != right)
{
cycles += 1;
return If!(isStrict!T)(
If!(isNMOS!T)([Bus(Action.READ, guess)]) ~
If!(isCMOS!T)([Bus(Action.READ, pc + opLen)])); // XXX
}
else if (noShortcut)
{
cycles += 1;
return If!(isStrict!T)([Bus(Action.READ, guess)]);
}
else
{
return cast(Bus[])[];
}
/*
* According to "Understanding the Apple IIe", the extra read on
* the 65C02 (marked XXX above) is the address of the last operand
* byte (pc + opLen - 1) for abx/aby, or the address of the high
* byte of the indirect address (op1 + 1) for izy.
*/
}
auto accesses_end(T)(T cpu, ubyte opcode, int opLen, ushort addr,
ref int cycles)
if (isCpu!T)
{
auto pc = getPC(cpu);
bool rmw = RMW_OPS!T.canFind(opcode);
bool write = !rmw && WRITE_OPS!T.canFind(opcode);
bool read = !rmw && !write;
bool decimal = isCMOS!T && getFlag(cpu, Flag.D) &&
BCD_OPS!T.canFind(opcode);
cycles += (rmw ? 3 : (write ? 1 : (1 + decimal)));
return If!read(
[Bus(Action.READ, addr)] ~
If!decimal(If!(isStrict!T)(
[Bus(Action.READ, pc + opLen)]))) ~
If!write(
[Bus(Action.WRITE, addr)]) ~
If!rmw(
[Bus(Action.READ, addr)] ~
If!(isStrict!T)(
If!(isNMOS!T)(
[Bus(Action.WRITE, addr)]) ~
If!(isCMOS!T)(
[Bus(Action.READ, addr)])) ~
[Bus(Action.WRITE, addr)]);
}
/// Bus access pattern for RTS.
auto accesses_op_RTS(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc];
assert(opcode == 0x60);
auto sp = getSP(cpu);
auto sp1 = pageWrapAdd(sp, 1);
auto sp2 = pageWrapAdd(sp, 2);
auto ret = address(mem[sp1], mem[sp2]);
cycles = 6;
return [Bus(Action.READ, pc)] ~
If!(isStrict!T)(
[Bus(Action.READ, pc+1),
Bus(Action.READ, sp)]) ~
[Bus(Action.READ, sp1),
Bus(Action.READ, sp2)] ~
If!(isStrict!T)(
[Bus(Action.READ, ret)]);
}
/// Bus access pattern for RTI.
auto accesses_op_RTI(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc];
assert(opcode == 0x40);
auto sp = getSP(cpu);
auto sp1 = pageWrapAdd(sp, 1);
auto sp2 = pageWrapAdd(sp, 2);
auto sp3 = pageWrapAdd(sp, 3);
cycles = 6;
return [Bus(Action.READ, pc)] ~
If!(isStrict!T)(
[Bus(Action.READ, pc+1),
Bus(Action.READ, sp)]) ~
[Bus(Action.READ, sp1),
Bus(Action.READ, sp2),
Bus(Action.READ, sp3)];
}
/// Bus access pattern for BRK.
auto accesses_op_BRK(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc];
assert(opcode == 0x00);
auto sp = getSP(cpu);
auto sp1 = pageWrapAdd(sp, -1);
auto sp2 = pageWrapAdd(sp, -2);
cycles = 7;
return [Bus(Action.READ, pc)] ~
If!(isStrict!T)(
[Bus(Action.READ, pc+1)]) ~
[Bus(Action.WRITE, sp),
Bus(Action.WRITE, sp1),
Bus(Action.WRITE, sp2),
Bus(Action.READ, 0xFFFE),
Bus(Action.READ, 0xFFFF)];
}
/// Bus access pattern for JSR
auto accesses_op_JSR(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc];
assert(opcode == 0x20);
auto sp = getSP(cpu);
auto sp1 = pageWrapAdd(sp, -1);
cycles = 6;
return [Bus(Action.READ, pc),
Bus(Action.READ, pc+1)] ~
If!(isStrict!T)(
[Bus(Action.READ, sp)]) ~
[Bus(Action.WRITE, sp),
Bus(Action.WRITE, sp1),
Bus(Action.READ, pc+2)];
}
/// Bus access pattern for JMP absolute
auto accesses_op_JMP_abs(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc];
assert(opcode == 0x4C);
cycles = 3;
return [Bus(Action.READ, pc),
Bus(Action.READ, pc+1),
Bus(Action.READ, pc+2)];
}
/// Bus access pattern for JMP indirect
auto accesses_op_JMP_ind(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc], op1 = mem[pc+1], op2 = mem[pc+2];
assert(opcode == 0x6C);
auto ial = address(op1, op2);
auto iah = (isNMOS!T ? pageWrapAdd(ial, 1)
: pageCrossAdd(ial, 1));
cycles = 5 + isCMOS!T;
return [Bus(Action.READ, pc),
Bus(Action.READ, pc+1),
Bus(Action.READ, pc+2)] ~
If!(isStrict!T)(If!(isCMOS!T)(
[Bus(Action.READ, pc+3)])) ~ // XXX
[Bus(Action.READ, ial),
Bus(Action.READ, iah)];
/*
* According to "Understanding the Apple IIe", the extra read on
* the 65C02 (marked XXX above) is the address of the last operand
* byte (pc + 2).
*/
}
/// Bus access pattern for JMP indirect,x
auto accesses_op_JMP_inx(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T && isCMOS!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc];
assert(opcode == 0x7C);
auto idx = getX(cpu);
auto base = address(mem[pc+1], mem[pc+2]);
auto ial = pageCrossAdd(base, idx);
auto iah = pageCrossAdd(ial, 1);
cycles = 6;
return [Bus(Action.READ, pc),
Bus(Action.READ, pc+1),
Bus(Action.READ, pc+2)] ~
If!(isStrict!T)(
[Bus(Action.READ, pc+3)]) ~ // XXX
[Bus(Action.READ, ial),
Bus(Action.READ, iah)];
/*
* According to "Understanding the Apple IIe", the extra read on
* the 65C02 (marked XXX above) is the address of the last operand
* byte (pc + 2).
*/
}
/// Bus access pattern for CMOS opcode 5C
auto accesses_op_5C(T)(T cpu, ref TestMemory mem, out int cycles)
if (isCpu!T && isCMOS!T)
{
auto pc = getPC(cpu);
auto opcode = mem[pc];
assert(opcode == 0x5C);
auto weird = address(mem[pc+1], 0xFF);
cycles = 8;
return [Bus(Action.READ, pc),
Bus(Action.READ, pc+1)] ~
If!(isStrict!T)(
[Bus(Action.READ, pc+2),
Bus(Action.READ, weird),
Bus(Action.READ, 0xFFFF),
Bus(Action.READ, 0xFFFF),
Bus(Action.READ, 0xFFFF),
Bus(Action.READ, 0xFFFF)]);
}
// Associates opcodes with expected access patterns.
string getExpected(T)()
{
string[] tmp = new string[256];
void add_op(const(ubyte[]) list, string fname)
{
foreach(op; list)
{
tmp[op] = " case 0x" ~ to!string(op, 16) ~ ": " ~
"expected = &" ~ fname ~ "!T; break;";
}
}
add_op(REG_OPS!T, "accesses_reg");
add_op(PUSH_OPS!T, "accesses_push");
add_op(PULL_OPS!T, "accesses_pull");
add_op(BRANCH_OPS!T, "accesses_rel");
add_op(IMM_OPS!T, "accesses_imm");
add_op(ZPG_OPS!T, "accesses_zpg");
add_op(ZPX_OPS!T, "accesses_zpxy");
add_op(ZPY_OPS!T, "accesses_zpxy");
add_op(ABS_OPS!T, "accesses_abs");
add_op(ABX_OPS!T, "accesses_abxy");
add_op(ABY_OPS!T, "accesses_abxy");
add_op(IZX_OPS!T, "accesses_izx");
add_op(IZY_OPS!T, "accesses_izy");
add_op([0x00], "accesses_op_BRK");
add_op([0x20], "accesses_op_JSR");
add_op([0x40], "accesses_op_RTI");
add_op([0x4C], "accesses_op_JMP_abs");
add_op([0x60], "accesses_op_RTS");
add_op([0x6C], "accesses_op_JMP_ind");
static if (isNMOS!T)
add_op(HLT_OPS!T, "accesses_hlt");
else
{
add_op(ZPI_OPS!T, "accesses_zpi");
add_op(NOP1_OPS!T, "accesses_nop1");
add_op([0x7C], "accesses_op_JMP_inx");
add_op([0x5C], "accesses_op_5C");
}
return "final switch (opcode)\n{\n" ~ join(tmp, "\n") ~ "\n}";
}
template timesetup_t(T)
{
alias Bus[] function(T, ref TestMemory, out int) timesetup_t;
}
alias void delegate(int, const Bus[], int, const Bus[], ubyte, string)
busreport;
auto run_timing_test(T)(timesetup_t!T expect, busreport report)
{
auto setup(ubyte opcode, CpuInfo cpu, Block[] data, OpInfo info,
string msg, TestSetup* next)
{
mixin testCallNext;
auto testcpu = makeCpu!T(cpu);
auto mem = TestMemory(data);
int expCycles;
auto expBus = expect(testcpu, mem, expCycles);
expBus = expBus ~ new Bus[8 - expBus.length];
connectMem(testcpu, mem);
auto actualBus = recordBus(testcpu);
auto actualCycles = recordCycles(testcpu);
runOneOpcode(testcpu);
report(actualCycles, actualBus, expCycles, expBus,
opcode, T.stringof ~ " | " ~ msg);
callNext();
}
return TestSetup(&setup);
}
auto report_timing_debug()
{
void report(int actualCycles, const Bus[] actualBus,
int expectCycles, const Bus[] expectBus,
ubyte opcode, string msg)
{
if (actualBus != expectBus)
{
// XXX make error message, throw
}
if (actualCycles != expectCycles)
{
// XXX make error message, throw
}
if (actualBus == expectBus && actualCycles == expectCycles) {}
else
{
write(format("[%0.2X] %s", opcode, msg));
writeln();
writeln(expectCycles, " ", actualCycles);
writeln(expectBus);
writeln(actualBus);
throw new TestException("timing");
}
}
return &report;
}
// Tests the bus access patterns and cycles taken for a given opcode.
void test_opcode_timing(T)(ubyte opcode, busreport report)
{
TestSetup setup_addr;
TestSetup setup_test;
testexpect expect;
timesetup_t!T expected;
mixin(getMemSetup!T());
mixin(getExpected!T());
auto setup = connect(setup_mask_flags(), setup_addr, setup_test);
auto run = connect(setup, run_timing_test!T(expected, report));
run.run(opcode);
}
unittest
{
auto report = report_timing_debug();
alias CPU!("65C02", false, false) T1;
for (int op = 0x00; op < 0x100; op++)
test_opcode_timing!T1(cast(ubyte)op, report);
alias CPU!("65C02", true, false) T2;
for (int op = 0x00; op < 0x100; op++)
test_opcode_timing!T2(cast(ubyte)op, report);
alias CPU!("6502", false, false) T3;
for (int op = 0x00; op < 0x100; op++)
test_opcode_timing!T3(cast(ubyte)op, report);
alias CPU!("6502", true, false) T4;
for (int op = 0x00; op < 0x100; op++)
test_opcode_timing!T4(cast(ubyte)op, report);
alias CPU!("65C02", false, true) T5;
for (int op = 0x00; op < 0x100; op++)
test_opcode_timing!T5(cast(ubyte)op, report);
alias CPU!("65C02", true, true) T6;
for (int op = 0x00; op < 0x100; op++)
test_opcode_timing!T6(cast(ubyte)op, report);
alias CPU!("6502", false, true) T7;
for (int op = 0x00; op < 0x100; op++)
test_opcode_timing!T7(cast(ubyte)op, report);
alias CPU!("6502", true, true) T8;
for (int op = 0x00; op < 0x100; op++)
test_opcode_timing!T8(cast(ubyte)op, report);
}
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