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twoapple-reboot
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Implement the rest of the undocumented opcodes.

This commit is contained in:
edmccard 2012-04-12 03:15:21 -04:00
parent b99e681952
commit 41a12c284a
2 changed files with 59 additions and 29 deletions
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61
src/cpu/ctfe_d6502.d
View File

@ -422,7 +422,7 @@ string OpBody(int op, string chip, bool s, bool c)
if (op != 0xAB)
ret ~= Load(_A ~ " = " ~ _X, env);
else
return "";
ret ~= LAX_IMM_Undoc(env);
break;
case "SAX":
ret ~= Store(_A ~ " & " ~ _X, env);
@ -440,15 +440,20 @@ string OpBody(int op, string chip, bool s, bool c)
ret ~= AXS_Undoc(env);
break;
case "AHX":
return "";
ret ~= Strange_Undoc(_A ~ " &" ~ _X, env);
break;
case "SHY":
return "";
ret ~= Strange_Undoc(_Y, env);
break;
case "SHX":
return "";
ret ~= Strange_Undoc(_X, env);
break;
case "TAS":
return "";
ret ~= Strange_Undoc(_S ~ " = " ~ _A ~ " & " ~ _X, env);
break;
case "XAA":
return "";
ret ~= XAA_Undoc(env);
break;
case "SLO":
ret ~= RMW_Undoc(ShiftLeft("data"),
SetNZ(_A ~ " |= data"), env);
@ -870,6 +875,50 @@ string AXS_Undoc(Env env)
}
/*
* This opcode is unstable on certain machines; see
* http://visual6502.org/wiki/index.php?title=6502_Opcode_8B_(XAA,ANE)
*/
string XAA_Undoc(Env env)
{
/*
* As far as I can tell, the only programs in the wild that depend
* on this opcode are certain C64 Mastertronic tape loaders; this
* magic value is used in the VICE emulator to make them work.
*/
string MAGIC = "0xff";
return ReadInto(Local("ubyte", "data"), "address", env) ~
_A ~ " = ((" ~ _A ~ " | " ~ MAGIC ~ ") & " ~ _X ~ " & data);\n" ~
SetNZ(_A);
}
/*
* This opcode is unstable on certain machines.
*/
string LAX_IMM_Undoc(Env env)
{
// From the VICE emulator.
string MAGIC = "0xee";
return ReadInto(Local("ubyte", "data"), "address", env) ~
_A ~ " = ((" ~ _A ~ " | " ~ MAGIC ~ ") & " ~ _X ~ " & data);\n" ~
SetNZ(_A);
}
// TODO: these are affected by DMA on the C64.
string Strange_Undoc(string val, Env env)
{
return "ubyte addrHi = cast(ubyte)((address >> 8) + 1);\n" ~
Local("ubyte", "data") ~ " = " ~ val ~ " & addrHi;\n" ~
"address = (guess == address) ? address : " ~
"((data << 8) | (address & 0xff));\n" ~
Write("address", "data", env);
}
string Local(string type)
{
version(OpFunctions)

27
test/test_new_cpu.d
View File

@ -39,27 +39,8 @@ void main()
test_opcode_timing!TX2(op, report2);
}
test_func([0x00, 0x08, 0x10, 0x18, 0x28, 0x30, 0x38, 0x50, 0x58, 0x68,
0x70, 0x78, 0x90, 0xad, 0xb0, 0xb8, 0xd0, 0xd8, 0xf0, 0xf8,
0xae, 0xac, 0x8d, 0x8e, 0x8c, 0xe8, 0xc8, 0xca, 0x88, 0xcd,
0xec, 0xcc, 0x0d, 0x2d, 0x4d, 0xee, 0xce, 0x60, 0x6d, 0xed,
0x4c, 0x09, 0x29, 0x49, 0x69, 0xe9, 0xc9, 0xe0, 0xc0, 0xa9,
0xa2, 0xa0, 0x1d, 0x19, 0x3d, 0x39, 0x5d, 0x59, 0x7d, 0x79,
0xfd, 0xf9, 0xdd, 0xd9, 0xde, 0xfe, 0xbd, 0xb9, 0x9d, 0x99,
0xbe, 0xbc, 0x6c, 0x7c, 0xb2, 0x72, 0x32, 0xd2, 0x52, 0x12,
0xf2, 0x92, 0xaa, 0x8a, 0xa8, 0x98, 0xba, 0x9a, 0x0a, 0x0e,
0x1e, 0x48, 0x2c, 0x05, 0x25, 0x45, 0x65, 0xe5, 0xc5, 0xe4,
0xc4, 0xc6, 0xe6, 0x06, 0x26, 0x46, 0x66, 0xa5, 0x85, 0xa6,
0x86, 0xa4, 0x84, 0x24, 0x15, 0x35, 0x55, 0x75, 0xf5, 0xd5,
0xd6, 0xf6, 0x16, 0x36, 0x56, 0x76, 0xb5, 0x95, 0xb6, 0x96,
0xb4, 0x94, 0x01, 0x21, 0x41, 0x61, 0xe1, 0xc1, 0xa1, 0x81,
0x11, 0x31, 0x51, 0x71, 0xf1, 0xd1, 0xb1, 0x91, 0xda, 0x5a,
0x7a, 0xfa, 0x89, 0x34, 0x3c, 0x1a, 0x3a, 0x80, 0x64, 0x74,
0x14, 0x1c, 0x04, 0x0c, 0x40, 0x03, 0x07, 0x0f, 0x13, 0x17,
0x1b, 0x1f, 0x23, 0x27, 0x2f, 0x33, 0x37, 0x3b, 0x3f, 0x43,
0x47, 0x4f, 0x53, 0x57, 0x5b, 0x5f, 0x5c, 0x63, 0x67, 0x6f,
0x73, 0x77, 0x7b, 0x7f, 0xc3, 0xc7, 0xcf, 0xd3, 0xd7, 0xdb,
0xdf, 0xe3, 0xe7, 0xe7, 0xf3, 0xf7, 0xfb, 0xff, 0xbb, 0x83,
0x87, 0x8f, 0x97, 0xa3, 0xa7, 0xaf, 0xb3, 0xb7, 0xbf, 0x6b,
0x0b, 0x2b, 0x4b, 0xeb, 0xcb]);
ubyte[256] ops;
foreach (x; 0..256) ops[x] = cast(ubyte)x;
test_func(ops);
}