Mercurial > vba-linux

     1 #include <cstdio>

     2 #include <cstring>

     3 

     4 #include "gbGlobals.h"

     5 

     6 typedef struct

     7 {

     8 	u8    mask;

     9 	u8    value;

    10 	char *mnen;

    11 } GBOPCODE;

    12 

    13 static char *registers[] =

    14 { "B", "C", "D", "E", "H", "L", "(HL)", "A" };

    15 

    16 static char *registers16[] =

    17 { "BC", "DE", "HL", "SP", // for some operations

    18   "BC", "DE", "HL", "AF" };   // for push/pop

    19 

    20 static char *cond[] =

    21 { "NZ", "Z", "NC", "C" };

    22 

    23 static char hexDigits[16] = {

    24 	'0', '1', '2', '3', '4', '5', '6', '7',

    25 	'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'

    26 };

    27 

    28 static GBOPCODE opcodes[] = {

    29 	{ 0xff, 0x00, "NOP"            },

    30 	{ 0xcf, 0x01, "LD %R4,%W"      },

    31 	{ 0xff, 0x02, "LD (BC),A"      },

    32 	{ 0xcf, 0x03, "INC %R4"        },

    33 	{ 0xc7, 0x04, "INC %r3"        },

    34 	{ 0xc7, 0x05, "DEC %r3"        },

    35 	{ 0xc7, 0x06, "LD %r3,%B"      },

    36 	{ 0xff, 0x07, "RLCA"           },

    37 	{ 0xff, 0x08, "LD (%W),SP"     },

    38 	{ 0xcf, 0x09, "ADD HL,%R4"     },

    39 	{ 0xff, 0x0a, "LD A,(BC)"      },

    40 	{ 0xcf, 0x0b, "DEC %R4"        },

    41 	{ 0xff, 0x0f, "RRCA"           },

    42 	{ 0xff, 0x10, "STOP"           },

    43 	{ 0xff, 0x12, "LD (DE),A"      },

    44 	{ 0xff, 0x17, "RLA"            },

    45 	{ 0xff, 0x18, "JR %d"          },

    46 	{ 0xff, 0x1a, "LD A,(DE)"      },

    47 	{ 0xff, 0x1f, "RRA"            },

    48 	{ 0xe7, 0x20, "JR %c3,%d"      },

    49 	{ 0xff, 0x22, "LDI (HL),A"     },

    50 	{ 0xff, 0x27, "DAA"            },

    51 	{ 0xff, 0x2a, "LDI A,(HL)"     },

    52 	{ 0xff, 0x2f, "CPL"            },

    53 	{ 0xff, 0x32, "LDD (HL),A"     },

    54 	{ 0xff, 0x37, "SCF"            },

    55 	{ 0xff, 0x3a, "LDD A,(HL)"     },

    56 	{ 0xff, 0x3f, "CCF"            },

    57 	{ 0xff, 0x76, "HALT"           },

    58 	{ 0xc0, 0x40, "LD %r3,%r0"     },

    59 	{ 0xf8, 0x80, "ADD A,%r0"      },

    60 	{ 0xf8, 0x88, "ADC A,%r0"      },

    61 	{ 0xf8, 0x90, "SUB %r0"        },

    62 	{ 0xf8, 0x98, "SBC A,%r0"      },

    63 	{ 0xf8, 0xa0, "AND %r0"        },

    64 	{ 0xf8, 0xa8, "XOR %r0"        },

    65 	{ 0xf8, 0xb0, "OR %r0"         },

    66 	{ 0xf8, 0xb8, "CP %r0"         },

    67 	{ 0xe7, 0xc0, "RET %c3"        },

    68 	{ 0xcf, 0xc1, "POP %t4"        },

    69 	{ 0xe7, 0xc2, "JP %c3,%W"      },

    70 	{ 0xff, 0xc3, "JP %W"          },

    71 	{ 0xe7, 0xc4, "CALL %c3,%W"    },

    72 	{ 0xcf, 0xc5, "PUSH %t4"       },

    73 	{ 0xff, 0xc6, "ADD A,%B"       },

    74 	{ 0xc7, 0xc7, "RST %P"         },

    75 	{ 0xff, 0xc9, "RET"            },

    76 	{ 0xff, 0xcd, "CALL %W"        },

    77 	{ 0xff, 0xce, "ADC %B"         },

    78 	{ 0xff, 0xd6, "SUB %B"         },

    79 	{ 0xff, 0xd9, "RETI"           },

    80 	{ 0xff, 0xde, "SBC %B"         },

    81 	{ 0xff, 0xe0, "LD (FF%B),A"    },

    82 	{ 0xff, 0xe2, "LD (FF00h+C),A" },

    83 	{ 0xff, 0xe6, "AND %B"         },

    84 	{ 0xff, 0xe8, "ADD SP,%D"      },

    85 	{ 0xff, 0xe9, "LD PC,HL"       },

    86 	{ 0xff, 0xea, "LD (%W),A"      },

    87 	{ 0xff, 0xee, "XOR %B"         },

    88 	{ 0xff, 0xf0, "LD A,(FF%B)"    },

    89 	{ 0xff, 0xf2, "LD A,(FF00h+C)" },

    90 	{ 0xff, 0xf3, "DI"             },

    91 	{ 0xff, 0xf6, "OR %B"          },

    92 	{ 0xff, 0xf8, "LD HL,SP%D"     },

    93 	{ 0xff, 0xf9, "LD SP,HL"       },

    94 	{ 0xff, 0xfa, "LD A,(%W)"      },

    95 	{ 0xff, 0xfb, "EI"             },

    96 	{ 0xff, 0xfe, "CP %B"          },

    97 	{ 0x00, 0x00, "DB %B"          }

    98 };

    99 

   100 static GBOPCODE cbOpcodes[] = {

   101 	{ 0xf8, 0x00, "RLC %r0"    },

   102 	{ 0xf8, 0x08, "RRC %r0"    },

   103 	{ 0xf8, 0x10, "RL %r0"     },

   104 	{ 0xf8, 0x18, "RR %r0"     },

   105 	{ 0xf8, 0x20, "SLA %r0"    },

   106 	{ 0xf8, 0x28, "SRA %r0"    },

   107 	{ 0xf8, 0x30, "SWAP %r0"   },

   108 	{ 0xf8, 0x38, "SRL %r0"    },

   109 	{ 0xc0, 0x40, "BIT %b,%r0" },

   110 	{ 0xc0, 0x80, "RES %b,%r0" },

   111 	{ 0xc0, 0xc0, "SET %b,%r0" },

   112 	{ 0x00, 0x00, "DB CBh,%B"  }

   113 };

   114 

   115 static char *addHex(char *p, u8 value)

   116 {

   117 	*p++ = hexDigits[value >> 4];

   118 	*p++ = hexDigits[value & 15];

   119 	return p;

   120 }

   121 

   122 static char *addHex16(char *p, u16 value)

   123 {

   124 	p = addHex(p, value>>8);

   125 	return addHex(p, value & 255);

   126 }

   127 

   128 static char *addStr(char *p, char *s)

   129 {

   130 	while (*s)

   131 	{

   132 		*p++ = *s++;

   133 	}

   134 	return p;

   135 }

   136 

   137 int gbDis(char *buffer, u16 address)

   138 {

   139 	char *p     = buffer;

   140 	int   instr = 1;

   141 	u16   addr  = address;

   142 	sprintf(p, "%04x        ", address);

   143 	p += 12;

   144 

   145 	u8 opcode = gbReadMemoryQuick(address);

   146 	address++;

   147 	char *    mnen;

   148 	GBOPCODE *op;

   149 	if (opcode == 0xcb)

   150 	{

   151 		opcode = gbReadMemoryQuick(address);

   152 		address++;

   153 		instr++;

   154 		op = cbOpcodes;

   155 	}

   156 	else

   157 	{

   158 		op = opcodes;

   159 	}

   160 	while (op->value != (opcode & op->mask))

   161 		op++;

   162 	mnen = op->mnen;

   163 

   164 	u8  b0, b1;

   165 	s8  disp;

   166 	int shift;

   167 

   168 	while (*mnen)

   169 	{

   170 		if (*mnen == '%')

   171 		{

   172 			mnen++;

   173 			switch (*mnen++)

   174 			{

   175 			case 'W':

   176 				b0 = gbReadMemoryQuick(address);

   177 				address++;

   178 				b1 = gbReadMemoryQuick(address);

   179 				address++;

   180 				p      = addHex16(p, b0|b1<<8);

   181 				instr += 2;

   182 				*p++   = 'h';

   183 				break;

   184 			case 'B':

   185 				p    = addHex(p, gbReadMemoryQuick(address));

   186 				*p++ = 'h';

   187 				address++;

   188 				instr++;

   189 				break;

   190 			case 'D':

   191 				disp = gbReadMemoryQuick(address);

   192 				if (disp >= 0)

   193 					*p++ = '+';

   194 				p += sprintf(p, "%d", disp);

   195 				instr++;

   196 				break;

   197 			case 'd':

   198 				disp = gbReadMemoryQuick(address);

   199 				address++;

   200 				p    = addHex16(p, address+disp);

   201 				*p++ = 'h';

   202 				instr++;

   203 				break;

   204 			case 'b':

   205 				// kind of a hack, but it works :-)

   206 				*p++ = hexDigits[(opcode >> 3) & 7];

   207 				break;

   208 			case 'r':

   209 				shift = *mnen++ - '0';

   210 				p     = addStr(p, registers[(opcode >> shift) & 7]);

   211 				break;

   212 			case 'R':

   213 				shift = *mnen++ - '0';

   214 				p     = addStr(p, registers16[(opcode >> shift) & 3]);

   215 				break;

   216 			case 't':

   217 				shift = *mnen++ - '0';

   218 				p     = addStr(p, registers16[4+((opcode >> shift) & 3)]);

   219 				break;

   220 			case 'P':

   221 				p = addHex(p, ((opcode >> 3) & 7) * 8);

   222 				break;

   223 			case 'c':

   224 				shift = *mnen++ - '0';

   225 				p     = addStr(p, cond[(opcode >> shift) & 3]);

   226 				break;

   227 			}

   228 		}

   229 		else

   230 			*p++ = *mnen++;

   231 	}

   232 	for (int i = 0; i < instr; i++)

   233 	{

   234 		u16 a = addr + i;

   235 		addHex(buffer+5+i*2, gbReadMemoryQuick(a));

   236 	}

   237 	*p = 0;

   238 	return instr;

   239 }
author	Robert McIntyre <rlm@mit.edu>
date	Sat, 03 Mar 2012 10:33:11 -0600
parents	f9f4f1b99eed
children