| 1 |
/* |
| 2 |
* mon_z80.cpp - Z80 disassembler |
| 3 |
* |
| 4 |
* cxmon (C) 1997-2003 Christian Bauer, Marc Hellwig |
| 5 |
* |
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* This program is free software; you can redistribute it and/or modify |
| 7 |
* it under the terms of the GNU General Public License as published by |
| 8 |
* the Free Software Foundation; either version 2 of the License, or |
| 9 |
* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
| 12 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
* GNU General Public License for more details. |
| 15 |
* |
| 16 |
* You should have received a copy of the GNU General Public License |
| 17 |
* along with this program; if not, write to the Free Software |
| 18 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 |
*/ |
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|
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#include "sysdeps.h" |
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|
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#include <stdarg.h> |
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|
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#include "mon.h" |
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#include "mon_disass.h" |
| 27 |
|
| 28 |
|
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// Addressing modes |
| 30 |
enum { |
| 31 |
A_IMPL, |
| 32 |
A_IMM8, // xx |
| 33 |
A_IMM16, // xxxx |
| 34 |
A_ABS8, // (xx) |
| 35 |
A_ABS16, // (xxxx) |
| 36 |
A_REL, // relative |
| 37 |
A_A, // a |
| 38 |
A_HL, // hl or ix or iy |
| 39 |
A_SP, // sp |
| 40 |
A_REG1, // 8-bit register (bits 0..2 of opcode) or (hl)/(ix+d)/(iy+d) |
| 41 |
A_REG1X, // 8-bit register (bits 0..2 of opcode) or (hl)/(ix+d)/(iy+d), don't substitute h or l on prefixes |
| 42 |
A_REG2, // 8-bit register (bits 3..5 of opcode) or (hl)/(ix+d)/(iy+d) |
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A_REG2X, // 8-bit register (bits 3..5 of opcode) or (hl)/(ix+d)/(iy+d), don't substitute h or l on prefixes |
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A_REG3, // 16-bit register (bits 4..5 of opcode) bc/de/hl/sp |
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A_REG4, // 16-bit register (bits 4..5 of opcode) bc/de/hl/af |
| 46 |
A_COND, // condition code (bits 3..5 of opcode) |
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A_COND2, // condition code (bits 3..4 of opcode) |
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A_BIT, // bit number (bits 3..5 of opcode) |
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A_BIT_REG1, // bit number (bits 3..5 of opcode) followed by 8-bit register (bits 0..2 of opcode) |
| 50 |
A_RST, // restart |
| 51 |
A_BC_IND, // (bc) |
| 52 |
A_DE_IND, // (de) |
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A_HL_IND, // (hl) or (ix) or (iy) |
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A_XY_IND, // (ix+d) or (iy+d) |
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A_SP_IND, // (sp) |
| 56 |
A_DE_HL, // de,hl |
| 57 |
A_AF_AF, // af,af' |
| 58 |
}; |
| 59 |
|
| 60 |
// Mnemonics |
| 61 |
enum { |
| 62 |
M_ADC, M_ADD, M_AND, M_BIT, M_CALL, M_CCF, M_CP, M_CPD, M_CPDR, M_CPI, |
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M_CPIR, M_CPL, M_DAA, M_DEC, M_DI, M_DJNZ, M_EI, M_EX, M_EXX, M_HALT, |
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M_IM0, M_IM1, M_IM2, M_IN, M_INC, M_IND, M_INDR, M_INI, M_INIR, M_JP, |
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M_JR, M_LD, M_LDD, M_LDDR, M_LDI, M_LDIR, M_NEG, M_NOP, M_OR, M_OTDR, |
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M_OTIR, M_OUT, M_OUTD, M_OUTI, M_POP, M_PUSH, M_RES, M_RET, M_RETI, |
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M_RETN, M_RL, M_RLA, M_RLC, M_RLCA, M_RLD, M_RR, M_RRA, M_RRC, M_RRCA, |
| 68 |
M_RRD, M_RST, M_SBC, M_SCF, M_SET, M_SL1, M_SLA, M_SRA, M_SRL, M_SUB, |
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M_XOR, |
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M_ILLEGAL, |
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|
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M_MAXIMUM |
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}; |
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|
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// Chars for each mnemonic |
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static const char mnem_1[] = "aaabccccccccddddeeehiiiiiiiiijjlllllnnoooooopprrrrrrrrrrrrrrrssssssssx?"; |
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static const char mnem_2[] = "ddniacppppppaeijixxammmnnnnnnprdddddeorttuuuoueeeelllllrrrrrsbcellrruo "; |
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static const char mnem_3[] = "cddtlf ddiilac n xl cddii ddiigp ditttpssttt accd accdtcft1aalbr "; |
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static const char mnem_4[] = " l r r z t012 r r r r rr di h in a a "; |
| 80 |
|
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// Mnemonic for each opcode |
| 82 |
static const char mnemonic[256] = { |
| 83 |
M_NOP , M_LD , M_LD , M_INC , M_INC , M_DEC , M_LD , M_RLCA, // 00 |
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M_EX , M_ADD, M_LD , M_DEC , M_INC , M_DEC , M_LD , M_RRCA, |
| 85 |
M_DJNZ, M_LD , M_LD , M_INC , M_INC , M_DEC , M_LD , M_RLA , // 10 |
| 86 |
M_JR , M_ADD, M_LD , M_DEC , M_INC , M_DEC , M_LD , M_RRA , |
| 87 |
M_JR , M_LD , M_LD , M_INC , M_INC , M_DEC , M_LD , M_DAA , // 20 |
| 88 |
M_JR , M_ADD, M_LD , M_DEC , M_INC , M_DEC , M_LD , M_CPL , |
| 89 |
M_JR , M_LD , M_LD , M_INC , M_INC , M_DEC , M_LD , M_SCF , // 30 |
| 90 |
M_JR , M_ADD, M_LD , M_DEC , M_INC , M_DEC , M_LD , M_CCF , |
| 91 |
M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , // 40 |
| 92 |
M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , |
| 93 |
M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , // 50 |
| 94 |
M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , |
| 95 |
M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , // 60 |
| 96 |
M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , |
| 97 |
M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , M_HALT, M_LD , // 70 |
| 98 |
M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , M_LD , |
| 99 |
M_ADD , M_ADD, M_ADD, M_ADD , M_ADD , M_ADD , M_ADD , M_ADD , // 80 |
| 100 |
M_ADC , M_ADC, M_ADC, M_ADC , M_ADC , M_ADC , M_ADC , M_ADC , |
| 101 |
M_SUB , M_SUB, M_SUB, M_SUB , M_SUB , M_SUB , M_SUB , M_SUB , // 90 |
| 102 |
M_SBC , M_SBC, M_SBC, M_SBC , M_SBC , M_SBC , M_SBC , M_SBC , |
| 103 |
M_AND , M_AND, M_AND, M_AND , M_AND , M_AND , M_AND , M_AND , // a0 |
| 104 |
M_XOR , M_XOR, M_XOR, M_XOR , M_XOR , M_XOR , M_XOR , M_XOR , |
| 105 |
M_OR , M_OR , M_OR , M_OR , M_OR , M_OR , M_OR , M_OR , // b0 |
| 106 |
M_CP , M_CP , M_CP , M_CP , M_CP , M_CP , M_CP , M_CP , |
| 107 |
M_RET , M_POP, M_JP , M_JP , M_CALL, M_PUSH , M_ADD , M_RST , // c0 |
| 108 |
M_RET , M_RET, M_JP , M_ILLEGAL, M_CALL, M_CALL , M_ADC , M_RST , |
| 109 |
M_RET , M_POP, M_JP , M_OUT , M_CALL, M_PUSH , M_SUB , M_RST , // d0 |
| 110 |
M_RET , M_EXX, M_JP , M_IN , M_CALL, M_ILLEGAL, M_SBC , M_RST , |
| 111 |
M_RET , M_POP, M_JP , M_EX , M_CALL, M_PUSH , M_AND , M_RST , // e0 |
| 112 |
M_RET , M_JP , M_JP , M_EX , M_CALL, M_ILLEGAL, M_XOR , M_RST , |
| 113 |
M_RET , M_POP, M_JP , M_DI , M_CALL, M_PUSH , M_OR , M_RST , // f0 |
| 114 |
M_RET , M_LD , M_JP , M_EI , M_CALL, M_ILLEGAL, M_CP , M_RST |
| 115 |
}; |
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|
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// Source/destination addressing modes for each opcode |
| 118 |
#define A(d,s) (((A_ ## d) << 8) | (A_ ## s)) |
| 119 |
|
| 120 |
static const short adr_mode[256] = { |
| 121 |
A(IMPL,IMPL) , A(REG3,IMM16) , A(BC_IND,A) , A(REG3,IMPL) , A(REG2,IMPL) , A(REG2,IMPL) , A(REG2,IMM8) , A(IMPL,IMPL) , // 00 |
| 122 |
A(AF_AF,IMPL) , A(HL,REG3) , A(A,BC_IND) , A(REG3,IMPL) , A(REG2,IMPL) , A(REG2,IMPL) , A(REG2,IMM8) , A(IMPL,IMPL) , |
| 123 |
A(REL,IMPL) , A(REG3,IMM16) , A(DE_IND,A) , A(REG3,IMPL) , A(REG2,IMPL) , A(REG2,IMPL) , A(REG2,IMM8) , A(IMPL,IMPL) , // 10 |
| 124 |
A(REL,IMPL) , A(HL,REG3) , A(A,DE_IND) , A(REG3,IMPL) , A(REG2,IMPL) , A(REG2,IMPL) , A(REG2,IMM8) , A(IMPL,IMPL) , |
| 125 |
A(COND2,REL) , A(REG3,IMM16) , A(ABS16,HL) , A(REG3,IMPL) , A(REG2,IMPL) , A(REG2,IMPL) , A(REG2,IMM8) , A(IMPL,IMPL) , // 20 |
| 126 |
A(COND2,REL) , A(HL,REG3) , A(HL,ABS16) , A(REG3,IMPL) , A(REG2,IMPL) , A(REG2,IMPL) , A(REG2,IMM8) , A(IMPL,IMPL) , |
| 127 |
A(COND2,REL) , A(REG3,IMM16) , A(ABS16,A) , A(REG3,IMPL) , A(REG2,IMPL) , A(REG2,IMPL) , A(REG2,IMM8) , A(IMPL,IMPL) , // 30 |
| 128 |
A(COND2,REL) , A(HL,REG3) , A(A,ABS16) , A(REG3,IMPL) , A(REG2,IMPL) , A(REG2,IMPL) , A(REG2,IMM8) , A(IMPL,IMPL) , |
| 129 |
A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2X,REG1), A(REG2,REG1) , // 40 |
| 130 |
A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2X,REG1), A(REG2,REG1) , |
| 131 |
A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2X,REG1), A(REG2,REG1) , // 50 |
| 132 |
A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2X,REG1), A(REG2,REG1) , |
| 133 |
A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2X,REG1), A(REG2,REG1) , // 60 |
| 134 |
A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2X,REG1), A(REG2,REG1) , |
| 135 |
A(REG2,REG1X) , A(REG2,REG1X) , A(REG2,REG1X), A(REG2,REG1X), A(REG2,REG1X), A(REG2,REG1X), A(IMPL,IMPL) , A(REG2,REG1X), // 70 |
| 136 |
A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2,REG1) , A(REG2X,REG1), A(REG2,REG1) , |
| 137 |
A(A,REG1) , A(A,REG1) , A(A,REG1) , A(A,REG1) , A(A,REG1) , A(A,REG1) , A(A,REG1) , A(A,REG1) , // 80 |
| 138 |
A(A,REG1) , A(A,REG1) , A(A,REG1) , A(A,REG1) , A(A,REG1) , A(A,REG1) , A(A,REG1) , A(A,REG1) , |
| 139 |
A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , // 90 |
| 140 |
A(A,REG1) , A(A,REG1) , A(A,REG1) , A(A,REG1) , A(A,REG1) , A(A,REG1) , A(A,REG1) , A(A,REG1) , |
| 141 |
A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , // a0 |
| 142 |
A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , |
| 143 |
A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , // b0 |
| 144 |
A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , A(REG1,IMPL) , |
| 145 |
A(COND,IMPL) , A(REG4,IMPL) , A(COND,IMM16), A(IMM16,IMPL), A(COND,IMM16), A(REG4,IMPL) , A(A,IMM8) , A(RST,IMPL) , // c0 |
| 146 |
A(COND,IMPL) , A(IMPL,IMPL) , A(COND,IMM16), A(IMPL,IMPL) , A(COND,IMM16), A(IMM16,IMPL), A(A,IMM8) , A(RST,IMPL) , |
| 147 |
A(COND,IMPL) , A(REG4,IMPL) , A(COND,IMM16), A(ABS8,A) , A(COND,IMM16), A(REG4,IMPL) , A(IMM8,IMPL) , A(RST,IMPL) , // d0 |
| 148 |
A(COND,IMPL) , A(IMPL,IMPL) , A(COND,IMM16), A(A,ABS8) , A(COND,IMM16), A(IMPL,IMPL) , A(A,IMM8) , A(RST,IMPL) , |
| 149 |
A(COND,IMPL) , A(REG4,IMPL) , A(COND,IMM16), A(SP_IND,HL) , A(COND,IMM16), A(REG4,IMPL) , A(IMM8,IMPL) , A(RST,IMPL) , // e0 |
| 150 |
A(COND,IMPL) , A(HL_IND,IMPL), A(COND,IMM16), A(DE_HL,IMPL), A(COND,IMM16), A(IMPL,IMPL) , A(IMM8,IMPL) , A(RST,IMPL) , |
| 151 |
A(COND,IMPL) , A(REG4,IMPL) , A(COND,IMM16), A(IMPL,IMPL) , A(COND,IMM16), A(REG4,IMPL) , A(IMM8,IMPL) , A(RST,IMPL) , // f0 |
| 152 |
A(COND,IMPL) , A(SP,HL) , A(COND,IMM16), A(IMPL,IMPL) , A(COND,IMM16), A(IMPL,IMPL) , A(IMM8,IMPL) , A(RST,IMPL) |
| 153 |
}; |
| 154 |
|
| 155 |
|
| 156 |
/* |
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* sprintf into a "stream" |
| 158 |
*/ |
| 159 |
|
| 160 |
struct SFILE { |
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char *buffer; |
| 162 |
char *current; |
| 163 |
}; |
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|
| 165 |
static int mon_sprintf(SFILE *f, const char *format, ...) |
| 166 |
{ |
| 167 |
int n; |
| 168 |
va_list args; |
| 169 |
va_start(args, format); |
| 170 |
vsprintf(f->current, format, args); |
| 171 |
f->current += n = strlen(f->current); |
| 172 |
va_end(args); |
| 173 |
return n; |
| 174 |
} |
| 175 |
|
| 176 |
|
| 177 |
/* |
| 178 |
* Disassemble one instruction, return number of bytes |
| 179 |
*/ |
| 180 |
|
| 181 |
static const char *reg_name[] = {"b", "c", "d", "e", "h", "l", "*", "a"}; |
| 182 |
static const char *reg_name_ix[] = {"b", "c", "d", "e", "hx", "lx", "*", "a"}; // undoc |
| 183 |
static const char *reg_name_iy[] = {"b", "c", "d", "e", "hy", "ly", "*", "a"}; // undoc |
| 184 |
static const char *reg_name_16[] = {"bc", "de", "hl", "sp"}; |
| 185 |
static const char *reg_name_16_2[] = {"bc", "de", "hl", "af"}; |
| 186 |
static const char *cond_name[] = {"nz", "z", "nc", "c", "po", "pe", "p", "m"}; |
| 187 |
|
| 188 |
static void operand(SFILE *f, char mode, uint32 &adr, uint8 op, bool ix, bool iy) |
| 189 |
{ |
| 190 |
switch (mode) { |
| 191 |
case A_IMPL: |
| 192 |
break; |
| 193 |
|
| 194 |
case A_IMM8: |
| 195 |
mon_sprintf(f, "$%02x", mon_read_byte(adr)); adr++; |
| 196 |
break; |
| 197 |
|
| 198 |
case A_IMM16: |
| 199 |
mon_sprintf(f, "$%04x", (mon_read_byte(adr + 1) << 8) | mon_read_byte(adr)); adr += 2; |
| 200 |
break; |
| 201 |
|
| 202 |
case A_ABS8: |
| 203 |
mon_sprintf(f, "($%02x)", mon_read_byte(adr)); adr++; |
| 204 |
break; |
| 205 |
|
| 206 |
case A_ABS16: |
| 207 |
mon_sprintf(f, "($%04x)", (mon_read_byte(adr + 1) << 8) | mon_read_byte(adr)); adr += 2; |
| 208 |
break; |
| 209 |
|
| 210 |
case A_REL: |
| 211 |
mon_sprintf(f, "$%04x", (adr + 2 + (int8)mon_read_byte(adr)) & 0xffff); adr++; |
| 212 |
break; |
| 213 |
|
| 214 |
case A_A: |
| 215 |
mon_sprintf(f, "a"); |
| 216 |
break; |
| 217 |
|
| 218 |
case A_HL: |
| 219 |
mon_sprintf(f, ix ? "ix" : (iy ? "iy" : "hl")); |
| 220 |
break; |
| 221 |
|
| 222 |
case A_SP: |
| 223 |
mon_sprintf(f, "sp"); |
| 224 |
break; |
| 225 |
|
| 226 |
case A_REG1: |
| 227 |
case A_REG1X: { |
| 228 |
int reg = op & 7; |
| 229 |
if (reg == 6) { |
| 230 |
if (ix || iy) { |
| 231 |
mon_sprintf(f, "(%s+$%02x)", ix ? "ix" : "iy", mon_read_byte(adr)); adr++; |
| 232 |
} else |
| 233 |
mon_sprintf(f, "(hl)"); |
| 234 |
} else if (mode == A_REG1) |
| 235 |
mon_sprintf(f, "%s", ix ? reg_name_ix[reg] : (iy ? reg_name_iy[reg] : reg_name[reg])); |
| 236 |
else |
| 237 |
mon_sprintf(f, "%s", reg_name[reg]); |
| 238 |
break; |
| 239 |
} |
| 240 |
|
| 241 |
case A_REG2: |
| 242 |
case A_REG2X: { |
| 243 |
int reg = (op >> 3) & 7; |
| 244 |
if (reg == 6) { |
| 245 |
if (ix || iy) { |
| 246 |
mon_sprintf(f, "(%s+$%02x)", ix ? "ix" : "iy", mon_read_byte(adr)); adr++; |
| 247 |
} else |
| 248 |
mon_sprintf(f, "(hl)"); |
| 249 |
} else if (mode == A_REG2) |
| 250 |
mon_sprintf(f, "%s", ix ? reg_name_ix[reg] : (iy ? reg_name_iy[reg] : reg_name[reg])); |
| 251 |
else |
| 252 |
mon_sprintf(f, "%s", reg_name[reg]); |
| 253 |
break; |
| 254 |
} |
| 255 |
|
| 256 |
case A_REG3: |
| 257 |
mon_sprintf(f, reg_name_16[(op >> 4) & 3]); |
| 258 |
break; |
| 259 |
|
| 260 |
case A_REG4: |
| 261 |
mon_sprintf(f, reg_name_16_2[(op >> 4) & 3]); |
| 262 |
break; |
| 263 |
|
| 264 |
case A_COND: |
| 265 |
mon_sprintf(f, cond_name[(op >> 3) & 7]); |
| 266 |
break; |
| 267 |
|
| 268 |
case A_COND2: |
| 269 |
mon_sprintf(f, cond_name[(op >> 3) & 3]); |
| 270 |
break; |
| 271 |
|
| 272 |
case A_BIT: |
| 273 |
mon_sprintf(f, "%d", (op >> 3) & 7); |
| 274 |
break; |
| 275 |
|
| 276 |
case A_BIT_REG1: { // undoc |
| 277 |
int reg = op & 7; |
| 278 |
if (reg == 6) |
| 279 |
mon_sprintf(f, "%d", (op >> 3) & 7); |
| 280 |
else |
| 281 |
mon_sprintf(f, "%d,%s", (op >> 3) & 7, reg_name[reg]); |
| 282 |
break; |
| 283 |
} |
| 284 |
|
| 285 |
case A_RST: |
| 286 |
mon_sprintf(f, "$%02x", op & 0x38); |
| 287 |
break; |
| 288 |
|
| 289 |
case A_BC_IND: |
| 290 |
mon_sprintf(f, "(bc)"); |
| 291 |
break; |
| 292 |
|
| 293 |
case A_DE_IND: |
| 294 |
mon_sprintf(f, "(de)"); |
| 295 |
break; |
| 296 |
|
| 297 |
case A_HL_IND: |
| 298 |
mon_sprintf(f, ix ? "(ix)" : (iy ? "(iy)" : "(hl)")); |
| 299 |
break; |
| 300 |
|
| 301 |
case A_XY_IND: // undoc |
| 302 |
mon_sprintf(f, "(%s+$%02x)", ix ? "ix" : "iy", mon_read_byte(adr)); adr++; |
| 303 |
break; |
| 304 |
|
| 305 |
case A_SP_IND: |
| 306 |
mon_sprintf(f, "(sp)"); |
| 307 |
break; |
| 308 |
|
| 309 |
case A_DE_HL: |
| 310 |
mon_sprintf(f, "de,hl"); |
| 311 |
break; |
| 312 |
|
| 313 |
case A_AF_AF: |
| 314 |
mon_sprintf(f, "af,af'"); |
| 315 |
break; |
| 316 |
} |
| 317 |
} |
| 318 |
|
| 319 |
static int print_instr(SFILE *f, char mnem, char dst_mode, char src_mode, uint32 adr, uint8 op, bool ix, bool iy) |
| 320 |
{ |
| 321 |
uint32 orig_adr = adr; |
| 322 |
|
| 323 |
// Print mnemonic |
| 324 |
mon_sprintf(f, "%c%c%c%c ", mnem_1[mnem], mnem_2[mnem], mnem_3[mnem], mnem_4[mnem]); |
| 325 |
|
| 326 |
// Print destination operand |
| 327 |
operand(f, dst_mode, adr, op, ix, iy); |
| 328 |
|
| 329 |
// Print source operand |
| 330 |
if (src_mode != A_IMPL) |
| 331 |
mon_sprintf(f, ","); |
| 332 |
operand(f, src_mode, adr, op, ix, iy); |
| 333 |
|
| 334 |
return adr - orig_adr; |
| 335 |
} |
| 336 |
|
| 337 |
static int disass_cb(SFILE *f, uint32 adr, bool ix, bool iy) |
| 338 |
{ |
| 339 |
int num; |
| 340 |
|
| 341 |
// Fetch opcode |
| 342 |
uint8 op; |
| 343 |
if (ix || iy) { |
| 344 |
op = mon_read_byte(adr + 1); |
| 345 |
num = 2; |
| 346 |
} else { |
| 347 |
op = mon_read_byte(adr); |
| 348 |
num = 1; |
| 349 |
} |
| 350 |
|
| 351 |
// Decode mnemonic and addressing modes |
| 352 |
char mnem = M_ILLEGAL, dst_mode = A_IMPL, src_mode = A_IMPL; |
| 353 |
switch (op & 0xc0) { |
| 354 |
case 0x00: |
| 355 |
dst_mode = A_REG1X; |
| 356 |
if ((ix || iy) && ((op & 7) != 6)) |
| 357 |
src_mode = A_XY_IND; |
| 358 |
switch ((op >> 3) & 7) { |
| 359 |
case 0: mnem = M_RLC; break; |
| 360 |
case 1: mnem = M_RRC; break; |
| 361 |
case 2: mnem = M_RL; break; |
| 362 |
case 3: mnem = M_RR; break; |
| 363 |
case 4: mnem = M_SLA; break; |
| 364 |
case 5: mnem = M_SRA; break; |
| 365 |
case 6: mnem = M_SL1; break; |
| 366 |
case 7: mnem = M_SRL; break; |
| 367 |
} |
| 368 |
break; |
| 369 |
case 0x40: |
| 370 |
mnem = M_BIT; dst_mode = A_BIT; |
| 371 |
if (ix || iy) |
| 372 |
src_mode = A_XY_IND; |
| 373 |
else |
| 374 |
src_mode = A_REG1; |
| 375 |
break; |
| 376 |
case 0x80: |
| 377 |
mnem = M_RES; |
| 378 |
if (ix || iy) { |
| 379 |
dst_mode = A_BIT_REG1; |
| 380 |
src_mode = A_XY_IND; |
| 381 |
} else { |
| 382 |
dst_mode = A_BIT; |
| 383 |
src_mode = A_REG1; |
| 384 |
} |
| 385 |
break; |
| 386 |
case 0xc0: |
| 387 |
mnem = M_SET; |
| 388 |
if (ix || iy) { |
| 389 |
dst_mode = A_BIT_REG1; |
| 390 |
src_mode = A_XY_IND; |
| 391 |
} else { |
| 392 |
dst_mode = A_BIT; |
| 393 |
src_mode = A_REG1; |
| 394 |
} |
| 395 |
break; |
| 396 |
} |
| 397 |
|
| 398 |
// Print instruction |
| 399 |
print_instr(f, mnem, dst_mode, src_mode, adr, op, ix, iy); |
| 400 |
return num; |
| 401 |
} |
| 402 |
|
| 403 |
static int disass_ed(SFILE *f, uint32 adr) |
| 404 |
{ |
| 405 |
// Fetch opcode |
| 406 |
uint8 op = mon_read_byte(adr); |
| 407 |
|
| 408 |
// Decode mnemonic and addressing modes |
| 409 |
char mnem, dst_mode = A_IMPL, src_mode = A_IMPL; |
| 410 |
switch (op) { |
| 411 |
case 0x40: |
| 412 |
case 0x48: |
| 413 |
case 0x50: |
| 414 |
case 0x58: |
| 415 |
case 0x60: |
| 416 |
case 0x68: |
| 417 |
case 0x78: |
| 418 |
mon_sprintf(f, "in %s,(c)", reg_name[(op >> 3) & 7]); |
| 419 |
return 1; |
| 420 |
case 0x70: |
| 421 |
mon_sprintf(f, "in (c)"); |
| 422 |
return 1; |
| 423 |
|
| 424 |
case 0x41: |
| 425 |
case 0x49: |
| 426 |
case 0x51: |
| 427 |
case 0x59: |
| 428 |
case 0x61: |
| 429 |
case 0x69: |
| 430 |
case 0x79: |
| 431 |
mon_sprintf(f, "out (c),%s", reg_name[(op >> 3) & 7]); |
| 432 |
return 1; |
| 433 |
case 0x71: // undoc |
| 434 |
mon_sprintf(f, "out (c),0"); |
| 435 |
return 1; |
| 436 |
|
| 437 |
case 0x42: |
| 438 |
case 0x52: |
| 439 |
case 0x62: |
| 440 |
case 0x72: |
| 441 |
mnem = M_SBC; dst_mode = A_HL; src_mode = A_REG3; |
| 442 |
break; |
| 443 |
|
| 444 |
case 0x43: |
| 445 |
case 0x53: |
| 446 |
case 0x63: |
| 447 |
case 0x73: |
| 448 |
mnem = M_LD; dst_mode = A_ABS16; src_mode = A_REG3; |
| 449 |
break; |
| 450 |
|
| 451 |
case 0x4a: |
| 452 |
case 0x5a: |
| 453 |
case 0x6a: |
| 454 |
case 0x7a: |
| 455 |
mnem = M_ADC; dst_mode = A_HL; src_mode = A_REG3; |
| 456 |
break; |
| 457 |
|
| 458 |
case 0x4b: |
| 459 |
case 0x5b: |
| 460 |
case 0x6b: |
| 461 |
case 0x7b: |
| 462 |
mnem = M_LD; dst_mode = A_REG3; src_mode = A_ABS16; |
| 463 |
break; |
| 464 |
|
| 465 |
case 0x44: |
| 466 |
case 0x4c: // undoc |
| 467 |
case 0x54: // undoc |
| 468 |
case 0x5c: // undoc |
| 469 |
case 0x64: // undoc |
| 470 |
case 0x6c: // undoc |
| 471 |
case 0x74: // undoc |
| 472 |
case 0x7c: // undoc |
| 473 |
mnem = M_NEG; |
| 474 |
break; |
| 475 |
|
| 476 |
case 0x45: |
| 477 |
case 0x55: // undoc |
| 478 |
case 0x5d: // undoc |
| 479 |
case 0x65: // undoc |
| 480 |
case 0x6d: // undoc |
| 481 |
case 0x75: // undoc |
| 482 |
case 0x7d: // undoc |
| 483 |
mnem = M_RETN; |
| 484 |
break; |
| 485 |
case 0x4d: mnem = M_RETI; break; |
| 486 |
|
| 487 |
case 0x46: |
| 488 |
case 0x4e: // undoc |
| 489 |
case 0x66: // undoc |
| 490 |
case 0x6e: // undoc |
| 491 |
mnem = M_IM0; |
| 492 |
break; |
| 493 |
case 0x56: |
| 494 |
case 0x76: // undoc |
| 495 |
mnem = M_IM1; |
| 496 |
break; |
| 497 |
case 0x5e: |
| 498 |
case 0x7e: // undoc |
| 499 |
mnem = M_IM2; |
| 500 |
break; |
| 501 |
|
| 502 |
case 0x47: |
| 503 |
mon_sprintf(f, "ld i,a"); |
| 504 |
return 1; |
| 505 |
case 0x4f: |
| 506 |
mon_sprintf(f, "ld r,a"); |
| 507 |
return 1; |
| 508 |
case 0x57: |
| 509 |
mon_sprintf(f, "ld a,i"); |
| 510 |
return 1; |
| 511 |
case 0x5f: |
| 512 |
mon_sprintf(f, "ld a,r"); |
| 513 |
return 1; |
| 514 |
|
| 515 |
case 0x67: mnem = M_RRD; break; |
| 516 |
case 0x6f: mnem = M_RLD; break; |
| 517 |
|
| 518 |
case 0xa0: mnem = M_LDI; break; |
| 519 |
case 0xa1: mnem = M_CPI; break; |
| 520 |
case 0xa2: mnem = M_INI; break; |
| 521 |
case 0xa3: mnem = M_OUTI; break; |
| 522 |
case 0xa8: mnem = M_LDD; break; |
| 523 |
case 0xa9: mnem = M_CPD; break; |
| 524 |
case 0xaa: mnem = M_IND; break; |
| 525 |
case 0xab: mnem = M_OUTD; break; |
| 526 |
case 0xb0: mnem = M_LDIR; break; |
| 527 |
case 0xb1: mnem = M_CPIR; break; |
| 528 |
case 0xb2: mnem = M_INIR; break; |
| 529 |
case 0xb3: mnem = M_OTIR; break; |
| 530 |
case 0xb8: mnem = M_LDDR; break; |
| 531 |
case 0xb9: mnem = M_CPDR; break; |
| 532 |
case 0xba: mnem = M_INDR; break; |
| 533 |
case 0xbb: mnem = M_OTDR; break; |
| 534 |
|
| 535 |
default: |
| 536 |
mnem = M_NOP; |
| 537 |
break; |
| 538 |
} |
| 539 |
|
| 540 |
// Print instruction |
| 541 |
return print_instr(f, mnem, dst_mode, src_mode, adr + 1, op, false, false) + 1; |
| 542 |
} |
| 543 |
|
| 544 |
static int disass(SFILE *f, uint32 adr, bool ix, bool iy) |
| 545 |
{ |
| 546 |
uint8 op = mon_read_byte(adr); |
| 547 |
if (op == 0xcb) |
| 548 |
return disass_cb(f, adr + 1, ix, iy) + 1; |
| 549 |
else |
| 550 |
return print_instr(f, mnemonic[op], adr_mode[op] >> 8, adr_mode[op] & 0xff, adr + 1, op, ix, iy) + 1; |
| 551 |
} |
| 552 |
|
| 553 |
int disass_z80(FILE *f, uint32 adr) |
| 554 |
{ |
| 555 |
int num; |
| 556 |
char buf[64]; |
| 557 |
SFILE sfile = {buf, buf}; |
| 558 |
|
| 559 |
switch (mon_read_byte(adr)) { |
| 560 |
case 0xdd: // ix prefix |
| 561 |
num = disass(&sfile, adr + 1, true, false) + 1; |
| 562 |
break; |
| 563 |
case 0xed: |
| 564 |
num = disass_ed(&sfile, adr + 1) + 1; |
| 565 |
break; |
| 566 |
case 0xfd: // iy prefix |
| 567 |
num = disass(&sfile, adr + 1, false, true) + 1; |
| 568 |
break; |
| 569 |
default: |
| 570 |
num = disass(&sfile, adr, false, false); |
| 571 |
break; |
| 572 |
} |
| 573 |
|
| 574 |
for (int i=0; i<4; i++) { |
| 575 |
if (num > i) |
| 576 |
fprintf(f, "%02x ", mon_read_byte(adr + i)); |
| 577 |
else |
| 578 |
fprintf(f, " "); |
| 579 |
} |
| 580 |
|
| 581 |
fprintf(f, "\t%s\n", buf); |
| 582 |
return num; |
| 583 |
} |
