1187 lines
25 KiB
C
1187 lines
25 KiB
C
// Game_Music_Emu 0.6-pre. http://www.slack.net/~ant/
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#if 0
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/* Define these macros in the source file before #including this file.
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- Parameters might be expressions, so they are best evaluated only once,
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though they NEVER have side-effects, so multiple evaluation is OK.
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- Output parameters might be a multiple-assignment expression like "a=x",
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so they must NOT be parenthesized.
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- Macros "returning" void may use a {} statement block. */
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// 0 <= addr <= 0xFFFF + page_size
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// time functions can be used
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int READ_MEM( addr_t );
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void WRITE_MEM( addr_t, int data );
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// Access of 0xFF00 + offset
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// 0 <= offset <= 0xFF
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int READ_IO( int offset );
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void WRITE_IO( int offset, int data );
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// Often-used instructions use this instead of READ_MEM
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void READ_FAST( addr_t, int& out );
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// The following can be used within macros:
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// Current time
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cpu_time_t TIME();
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#endif
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/* Copyright (C) 2003-2009 Shay Green. This module is free software; you
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can redistribute it and/or modify it under the terms of the GNU Lesser
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General Public License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version. This
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module is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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details. You should have received a copy of the GNU Lesser General Public
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License along with this module; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
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// Common instructions:
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//
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// 365880 FA LD A,(nn)
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// 355863 20 JR NZ
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// 313655 21 LD HL,nn
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// 274580 28 JR Z
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// 252878 FE CP n
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// 230541 7E LD A,(HL)
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// 226209 2A LD A,(HL+)
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// 217467 CD CALL
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// 212034 C9 RET
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// 208376 CB CB prefix
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//
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// 27486 CB 7E BIT 7,(HL)
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// 15925 CB 76 BIT 6,(HL)
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// 13035 CB 19 RR C
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// 11557 CB 7F BIT 7,A
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// 10898 CB 37 SWAP A
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// 10208 CB 66 BIT 4,(HL)
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// Allows MWCW debugger to step through code properly
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#ifdef CPU_BEGIN
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CPU_BEGIN
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#endif
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#define TIME() s.time
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#define CODE_PAGE( addr ) s.code_map [GB_CPU_PAGE( addr )]
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#define READ_CODE( addr ) (CODE_PAGE( addr ) [GB_CPU_OFFSET( addr )])
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// Flags with hex value for clarity when used as mask.
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// Stored in indicated variable during emulation.
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int const z80 = 0x80; // cz
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int const n40 = 0x40; // ph
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int const h20 = 0x20; // ph
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int const c10 = 0x10; // cz
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#define SET_FLAGS( in )\
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{\
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cz = ((in) << 4 & 0x100) + (~(in) >> 7 & 1);\
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ph = (~(in) << 2 & 0x100) + ((in) >> 1 & 0x10);\
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}
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// random bits in cz to catch misuse of them
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#define SET_FLAGS_DEBUG( in )\
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{\
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cz = ((in) << 4 & 0x100) | (rand() & ~0x1FF) | ((in) & 0x80 ? 0 : (rand() & 0xFF) | 1);\
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ph = (~(in) << 2 & 0x100) | (((in) >> 1 & 0x10) ^ BYTE( cz ));\
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}
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#define GET_FLAGS( out )\
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{\
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out = (cz >> 4 & c10);\
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out += ~ph >> 2 & n40;\
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out += (ph ^ cz) << 1 & h20;\
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if ( !BYTE( cz ) )\
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out += z80;\
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}
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#define CC_NZ() ( BYTE( cz ))
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#define CC_Z() (!BYTE( cz ))
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#define CC_NC() (!(cz & 0x100))
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#define CC_C() ( cz & 0x100 )
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// Truncation
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#define BYTE( n ) ((uint8_t ) (n)) /* (unsigned) n & 0xFF */
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#define SBYTE( n ) ((int8_t ) (n)) /* (BYTE( n ) ^ 0x80) - 0x80 */
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#define WORD( n ) ((uint16_t) (n)) /* (unsigned) n & 0xFFFF */
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{
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struct cpu_state_t s;
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cpu->cpu_state = &s;
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memcpy( &s, &cpu->cpu_state_, sizeof s );
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union {
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struct {
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#ifdef BLARGG_BIG_ENDIAN
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byte b, c, d, e, h, l, flags, a;
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#else
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byte c, b, e, d, l, h, a, flags;
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#endif
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} rg; // individual registers
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struct core_regs_t rp; // pairs
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byte r8_ [8]; // indexed registers (use R8 macro due to endian dependence)
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uint16_t r16 [4]; // indexed pairs
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} reg;
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BOOST_STATIC_ASSERT( sizeof reg.rg == 8 && sizeof reg.rp == 8 );
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#ifdef BLARGG_BIG_ENDIAN
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#define R8( n ) (reg.r8_ [n])
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#elif defined(BLARGG_LITTLE_ENDIAN)
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#define R8( n ) (reg.r8_ [(n) ^ 1])
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#else
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// Be sure "blargg_endian.h" has been #included in the file that #includes this
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#error "Byte order of CPU must be known"
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#endif
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#define R16( n ) (reg.r16 [n])
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#define RG (reg.rg)
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#define RP (reg.rp)
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RP = cpu->r.rp;
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int pc = cpu->r.pc;
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int sp = cpu->r.sp;
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int ph;
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int cz;
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SET_FLAGS( RG.flags );
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int time = s.time;
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loop:
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check( (unsigned) pc < 0x10000 + 1 ); // +1 so emulator can catch wrap-around
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check( (unsigned) sp < 0x10000 );
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byte const* instr = CODE_PAGE( pc );
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int op;
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if ( GB_CPU_OFFSET(~0) == ~0 )
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{
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op = instr [pc];
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pc++;
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instr += pc;
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}
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else
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{
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instr += GB_CPU_OFFSET( pc );
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op = *instr++;
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pc++;
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}
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#define GET_ADDR() GET_LE16( instr )
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static byte const instr_times [256*2] = {
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// 0 1 2 3 4 5 6 7 8 9 A B C D E F
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4,12, 8, 8, 4, 4, 8, 4,20, 8, 8, 8, 4, 4, 8, 4,// 0
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4,12, 8, 8, 4, 4, 8, 4,12, 8, 8, 8, 4, 4, 8, 4,// 1
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8,12, 8, 8, 4, 4, 8, 4, 8, 8, 8, 8, 4, 4, 8, 4,// 2
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8,12, 8, 8,12,12,12, 4, 8, 8, 8, 8, 4, 4, 8, 4,// 3
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4, 4, 4, 4, 4, 4, 8, 4, 4, 4, 4, 4, 4, 4, 8, 4,// 4
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4, 4, 4, 4, 4, 4, 8, 4, 4, 4, 4, 4, 4, 4, 8, 4,// 5
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4, 4, 4, 4, 4, 4, 8, 4, 4, 4, 4, 4, 4, 4, 8, 4,// 6
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8, 8, 8, 8, 8, 8, 0, 8, 4, 4, 4, 4, 4, 4, 8, 4,// 7
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4, 4, 4, 4, 4, 4, 8, 4, 4, 4, 4, 4, 4, 4, 8, 4,// 8
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4, 4, 4, 4, 4, 4, 8, 4, 4, 4, 4, 4, 4, 4, 8, 4,// 9
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4, 4, 4, 4, 4, 4, 8, 4, 4, 4, 4, 4, 4, 4, 8, 4,// A
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4, 4, 4, 4, 4, 4, 8, 4, 4, 4, 4, 4, 4, 4, 8, 4,// B
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8,12,16,16,12,16, 8,16, 8,16,16, 0,12,24, 8,16,// C
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8,12,16, 0,12,16, 8,16, 8,16,16, 0,12, 0, 8,16,// D
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12,12, 8, 0, 0,16, 8,16,16, 4,16, 0, 0, 0, 8,16,// E
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12,12, 8, 4, 0,16, 8,16,12, 8,16, 4, 0, 0, 8,16,// F
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// CB prefixed
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// 0 1 2 3 4 5 6 7 8 9 A B C D E F
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8, 8, 8, 8, 8, 8,16, 8, 8, 8, 8, 8, 8, 8,16, 8,// 0
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8, 8, 8, 8, 8, 8,16, 8, 8, 8, 8, 8, 8, 8,16, 8,// 1
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8, 8, 8, 8, 8, 8,16, 8, 8, 8, 8, 8, 8, 8,16, 8,// 2
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8, 8, 8, 8, 8, 8,16, 8, 8, 8, 8, 8, 8, 8,16, 8,// 3
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8, 8, 8, 8, 8, 8,12, 8, 8, 8, 8, 8, 8, 8,12, 8,// 4
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8, 8, 8, 8, 8, 8,12, 8, 8, 8, 8, 8, 8, 8,12, 8,// 5
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8, 8, 8, 8, 8, 8,12, 8, 8, 8, 8, 8, 8, 8,12, 8,// 6
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8, 8, 8, 8, 8, 8,12, 8, 8, 8, 8, 8, 8, 8,12, 8,// 7
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8, 8, 8, 8, 8, 8,16, 8, 8, 8, 8, 8, 8, 8,16, 8,// 8
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8, 8, 8, 8, 8, 8,16, 8, 8, 8, 8, 8, 8, 8,16, 8,// 9
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8, 8, 8, 8, 8, 8,16, 8, 8, 8, 8, 8, 8, 8,16, 8,// A
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8, 8, 8, 8, 8, 8,16, 8, 8, 8, 8, 8, 8, 8,16, 8,// B
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8, 8, 8, 8, 8, 8,16, 8, 8, 8, 8, 8, 8, 8,16, 8,// C
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8, 8, 8, 8, 8, 8,16, 8, 8, 8, 8, 8, 8, 8,16, 8,// D
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8, 8, 8, 8, 8, 8,16, 8, 8, 8, 8, 8, 8, 8,16, 8,// E
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8, 8, 8, 8, 8, 8,16, 8, 8, 8, 8, 8, 8, 8,16, 8,// F
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};
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if ( time >= 0 )
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goto stop;
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time += instr_times [op];
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int data;
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data = *instr;
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s.time = time;
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#ifdef CPU_INSTR_HOOK
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{ CPU_INSTR_HOOK( (pc-1), (instr-1), rg.a, rp.bc, rp.de, rp.hl, sp ); }
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#endif
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switch ( op )
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{
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// TODO: more efficient way to handle negative branch that wraps PC around
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#define BRANCH_( cond, clocks )\
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{\
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pc++;\
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if ( !(cond) )\
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goto loop;\
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pc = WORD( pc + SBYTE( data ) );\
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time += clocks;\
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goto loop;\
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}
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#define BRANCH( cond ) BRANCH_( cond, 4 )
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// Most Common
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case 0x20: // JR NZ
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BRANCH( CC_NZ() )
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case 0x21: // LD HL,IMM (common)
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RP.hl = GET_ADDR();
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pc += 2;
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goto loop;
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case 0x28: // JR Z
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BRANCH( CC_Z() )
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case 0xF2: // LD A,(0xFF00+C)
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READ_IO( this, RG.c, RG.a );
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goto loop;
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case 0xF0: // LD A,(0xFF00+imm)
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pc++;
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READ_IO( this, data, RG.a );
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goto loop;
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{
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int temp;
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case 0x0A: // LD A,(BC)
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temp = RP.bc;
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goto ld_a_ind_comm;
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case 0x3A: // LD A,(HL-)
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temp = RP.hl;
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RP.hl = temp - 1;
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goto ld_a_ind_comm;
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case 0x1A: // LD A,(DE)
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temp = RP.de;
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goto ld_a_ind_comm;
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case 0x2A: // LD A,(HL+) (common)
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temp = RP.hl;
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RP.hl = temp + 1;
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goto ld_a_ind_comm;
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case 0xFA: // LD A,IND16 (common)
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temp = GET_ADDR();
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pc += 2;
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ld_a_ind_comm:
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READ_FAST( this, temp, RG.a );
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goto loop;
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}
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{
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int temp;
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case 0xBE: // CP (HL)
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temp = READ_MEM( this, RP.hl );
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goto cmp_comm;
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case 0xB8: // CP B
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case 0xB9: // CP C
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case 0xBA: // CP D
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case 0xBB: // CP E
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case 0xBC: // CP H
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case 0xBD: // CP L
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case 0xBF: // CP A
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temp = R8( op & 7 );
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cmp_comm:
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ph = RG.a ^ temp; // N=1 H=*
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cz = RG.a - temp; // C=* Z=*
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goto loop;
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}
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case 0xFE: // CP IMM
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pc++;
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ph = RG.a ^ data; // N=1 H=*
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cz = RG.a - data; // C=* Z=*
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goto loop;
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case 0x46: // LD B,(HL)
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case 0x4E: // LD C,(HL)
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case 0x56: // LD D,(HL)
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case 0x5E: // LD E,(HL)
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case 0x66: // LD H,(HL)
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case 0x6E: // LD L,(HL)
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case 0x7E:{// LD A,(HL)
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int addr = RP.hl;
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READ_FAST( this, addr, R8( op >> 3 & 7 ) );
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goto loop;
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}
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case 0xC4: // CNZ (next-most-common)
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pc += 2;
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if ( CC_Z() )
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goto loop;
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call:
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time += 12;
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pc -= 2;
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case 0xCD: // CALL (most-common)
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data = pc + 2;
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pc = GET_ADDR();
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push: {
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int addr = WORD( sp - 1 );
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WRITE_MEM( this, addr, (data >> 8) );
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sp = WORD( sp - 2 );
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WRITE_MEM( this, sp, data );
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goto loop;
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}
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case 0xC8: // RET Z (next-most-common)
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if ( CC_NZ() )
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goto loop;
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ret:
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time += 12;
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case 0xD9: // RETI
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case 0xC9:{// RET (most common)
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pc = READ_MEM( this, sp );
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int addr = sp + 1;
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sp = WORD( sp + 2 );
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pc += 0x100 * READ_MEM( this, addr );
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goto loop;
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}
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case 0x00: // NOP
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case 0x40: // LD B,B
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case 0x49: // LD C,C
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case 0x52: // LD D,D
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case 0x5B: // LD E,E
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case 0x64: // LD H,H
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case 0x6D: // LD L,L
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case 0x7F: // LD A,A
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goto loop;
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// CB Instructions
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case 0xCB:
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time += (instr_times + 256) [data];
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pc++;
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// now data is the opcode
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switch ( data ) {
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case 0x46: // BIT b,(HL)
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case 0x4E:
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case 0x56:
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case 0x5E:
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case 0x66:
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case 0x6E:
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case 0x76:
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case 0x7E: {
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int addr = RP.hl;
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READ_FAST( this, addr, op );
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goto bit_comm;
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}
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case 0x40: case 0x41: case 0x42: case 0x43: // BIT b,r
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case 0x44: case 0x45: case 0x47: case 0x48:
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case 0x49: case 0x4A: case 0x4B: case 0x4C:
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case 0x4D: case 0x4F: case 0x50: case 0x51:
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case 0x52: case 0x53: case 0x54: case 0x55:
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case 0x57: case 0x58: case 0x59: case 0x5A:
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case 0x5B: case 0x5C: case 0x5D: case 0x5F:
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case 0x60: case 0x61: case 0x62: case 0x63:
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case 0x64: case 0x65: case 0x67: case 0x68:
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case 0x69: case 0x6A: case 0x6B: case 0x6C:
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case 0x6D: case 0x6F: case 0x70: case 0x71:
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case 0x72: case 0x73: case 0x74: case 0x75:
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case 0x77: case 0x78: case 0x79: case 0x7A:
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case 0x7B: case 0x7C: case 0x7D: case 0x7F:
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op = R8( data & 7 );
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bit_comm:
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ph = op >> (data >> 3 & 7) & 1;
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cz = (cz & 0x100) + ph;
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ph ^= 0x110; // N=0 H=1
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goto loop;
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case 0x86: // RES b,(HL)
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case 0x8E:
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case 0x96:
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case 0x9E:
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case 0xA6:
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case 0xAE:
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case 0xB6:
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case 0xBE: {
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int temp = READ_MEM( this, RP.hl );
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temp &= ~(1 << (data >> 3 & 7));
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WRITE_MEM( this, RP.hl, temp );
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goto loop;
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}
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case 0xC6: // SET b,(HL)
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case 0xCE:
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case 0xD6:
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case 0xDE:
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case 0xE6:
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case 0xEE:
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case 0xF6:
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case 0xFE: {
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int temp = READ_MEM( this, RP.hl );
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temp |= 1 << (data >> 3 & 7);
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WRITE_MEM( this, RP.hl, temp );
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goto loop;
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}
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case 0xC0: case 0xC1: case 0xC2: case 0xC3: // SET b,r
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case 0xC4: case 0xC5: case 0xC7: case 0xC8:
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case 0xC9: case 0xCA: case 0xCB: case 0xCC:
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case 0xCD: case 0xCF: case 0xD0: case 0xD1:
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case 0xD2: case 0xD3: case 0xD4: case 0xD5:
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case 0xD7: case 0xD8: case 0xD9: case 0xDA:
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case 0xDB: case 0xDC: case 0xDD: case 0xDF:
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case 0xE0: case 0xE1: case 0xE2: case 0xE3:
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case 0xE4: case 0xE5: case 0xE7: case 0xE8:
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case 0xE9: case 0xEA: case 0xEB: case 0xEC:
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case 0xED: case 0xEF: case 0xF0: case 0xF1:
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case 0xF2: case 0xF3: case 0xF4: case 0xF5:
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case 0xF7: case 0xF8: case 0xF9: case 0xFA:
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case 0xFB: case 0xFC: case 0xFD: case 0xFF:
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R8( data & 7 ) |= 1 << (data >> 3 & 7);
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goto loop;
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|
|
case 0x80: case 0x81: case 0x82: case 0x83: // RES b,r
|
|
case 0x84: case 0x85: case 0x87: case 0x88:
|
|
case 0x89: case 0x8A: case 0x8B: case 0x8C:
|
|
case 0x8D: case 0x8F: case 0x90: case 0x91:
|
|
case 0x92: case 0x93: case 0x94: case 0x95:
|
|
case 0x97: case 0x98: case 0x99: case 0x9A:
|
|
case 0x9B: case 0x9C: case 0x9D: case 0x9F:
|
|
case 0xA0: case 0xA1: case 0xA2: case 0xA3:
|
|
case 0xA4: case 0xA5: case 0xA7: case 0xA8:
|
|
case 0xA9: case 0xAA: case 0xAB: case 0xAC:
|
|
case 0xAD: case 0xAF: case 0xB0: case 0xB1:
|
|
case 0xB2: case 0xB3: case 0xB4: case 0xB5:
|
|
case 0xB7: case 0xB8: case 0xB9: case 0xBA:
|
|
case 0xBB: case 0xBC: case 0xBD: case 0xBF:
|
|
R8( data & 7 ) &= ~(1 << (data >> 3 & 7));
|
|
goto loop;
|
|
|
|
case 0x36: // SWAP (HL)
|
|
op = READ_MEM( this, RP.hl );
|
|
goto swap_comm;
|
|
|
|
case 0x30: // SWAP B
|
|
case 0x31: // SWAP C
|
|
case 0x32: // SWAP D
|
|
case 0x33: // SWAP E
|
|
case 0x34: // SWAP H
|
|
case 0x35: // SWAP L
|
|
case 0x37: // SWAP A
|
|
op = R8( data & 7 );
|
|
swap_comm:
|
|
op = (op >> 4) + (op << 4);
|
|
cz = BYTE( op );
|
|
ph = cz + 0x100;
|
|
if ( data == 0x36 )
|
|
goto write_hl_op_ff;
|
|
R8( data & 7 ) = op;
|
|
goto loop;
|
|
|
|
// Shift/Rotate
|
|
|
|
case 0x26: // SLA (HL)
|
|
cz = 0;
|
|
case 0x16: // RL (HL)
|
|
cz = (cz >> 8 & 1) + (READ_MEM( this, RP.hl ) << 1);
|
|
goto rl_hl_common;
|
|
|
|
case 0x06: // RLC (HL)
|
|
cz = READ_MEM( this, RP.hl );
|
|
cz = (cz << 1) + (cz >> 7 & 1);
|
|
rl_hl_common:
|
|
// Z=* C=*
|
|
ph = cz | 0x100; // N=0 H=0
|
|
WRITE_MEM( this, RP.hl, cz );
|
|
goto loop;
|
|
|
|
case 0x20: case 0x21: case 0x22: case 0x23: case 0x24: case 0x25: case 0x27: // SLA r
|
|
cz = 0;
|
|
case 0x10: case 0x11: case 0x12: case 0x13: case 0x14: case 0x15: case 0x17: // RL r
|
|
cz = (cz >> 8 & 1) + (R8( data & 7 ) << 1);
|
|
goto rl_common;
|
|
|
|
case 0x00: case 0x01: case 0x02: case 0x03: case 0x04: case 0x05: case 0x07: // RLC r
|
|
cz = R8( data & 7 );
|
|
cz = (cz << 1) + (cz >> 7 & 1);
|
|
rl_common:
|
|
// Z=* C=*
|
|
ph = cz | 0x100; // N=0 H=0
|
|
R8( data & 7 ) = cz;
|
|
goto loop;
|
|
|
|
case 0x0E: // RRC (HL)
|
|
cz = READ_MEM( this, RP.hl );
|
|
cz += cz << 8 & 0x100;
|
|
goto rr_hl_common;
|
|
|
|
case 0x2E: // SRA (HL)
|
|
cz = READ_MEM( this, RP.hl );
|
|
cz += cz << 1 & 0x100;
|
|
goto rr_hl_common;
|
|
|
|
case 0x3E: // SRL (HL)
|
|
cz = 0;
|
|
case 0x1E: // RR (HL)
|
|
cz = (cz & 0x100) + READ_MEM( this, RP.hl );
|
|
rr_hl_common:
|
|
cz = (cz << 8) + (cz >> 1); // Z=* C=*
|
|
ph = cz | 0x100; // N=0 H=0
|
|
WRITE_MEM( this, RP.hl, cz );
|
|
goto loop;
|
|
|
|
case 0x08: case 0x09: case 0x0A: case 0x0B: case 0x0C: case 0x0D: case 0x0F: // RRC r
|
|
cz = R8( data & 7 );
|
|
cz += cz << 8 & 0x100;
|
|
goto rr_common;
|
|
|
|
case 0x28: case 0x29: case 0x2A: case 0x2B: case 0x2C: case 0x2D: case 0x2F: // SRA r
|
|
cz = R8( data & 7 );
|
|
cz += cz << 1 & 0x100;
|
|
goto rr_common;
|
|
|
|
case 0x38: case 0x39: case 0x3A: case 0x3B: case 0x3C: case 0x3D: case 0x3F: // SRL r
|
|
cz = 0;
|
|
case 0x18: case 0x19: case 0x1A: case 0x1B: case 0x1C: case 0x1D: case 0x1F: // RR r
|
|
cz = (cz & 0x100) + R8( data & 7 );
|
|
rr_common:
|
|
cz = (cz << 8) + (cz >> 1); // Z=* C=*
|
|
ph = cz | 0x100; // N=0 H=0
|
|
R8( data & 7 ) = cz;
|
|
goto loop;
|
|
|
|
} // CB op
|
|
assert( false ); // unhandled CB op
|
|
|
|
case 0x07: // RLCA
|
|
cz = RG.a >> 7;
|
|
goto rlc_common;
|
|
case 0x17: // RLA
|
|
cz = cz >> 8 & 1;
|
|
rlc_common:
|
|
cz += RG.a << 1;
|
|
ph = cz | 0x100;
|
|
RG.a = BYTE( cz );
|
|
cz |= 1;
|
|
goto loop;
|
|
|
|
case 0x0F: // RRCA
|
|
ph = RG.a << 8;
|
|
goto rrc_common;
|
|
case 0x1F: // RRA
|
|
ph = cz;
|
|
rrc_common:
|
|
cz = (RG.a << 8) + 1; // Z=0 C=*
|
|
RG.a = ((ph & 0x100) + RG.a) >> 1;
|
|
ph = 0x100; // N=0 H=0
|
|
goto loop;
|
|
|
|
// Load
|
|
|
|
case 0x70: // LD (HL),B
|
|
case 0x71: // LD (HL),C
|
|
case 0x72: // LD (HL),D
|
|
case 0x73: // LD (HL),E
|
|
case 0x74: // LD (HL),H
|
|
case 0x75: // LD (HL),L
|
|
case 0x77: // LD (HL),A
|
|
op = R8( op & 7 );
|
|
write_hl_op_ff:
|
|
WRITE_MEM( this, RP.hl, op );
|
|
goto loop;
|
|
|
|
case 0x41: case 0x42: case 0x43: case 0x44: case 0x45: case 0x47: // LD r,r
|
|
case 0x48: case 0x4A: case 0x4B: case 0x4C: case 0x4D: case 0x4F:
|
|
case 0x50: case 0x51: case 0x53: case 0x54: case 0x55: case 0x57:
|
|
case 0x58: case 0x59: case 0x5A: case 0x5C: case 0x5D: case 0x5F:
|
|
case 0x60: case 0x61: case 0x62: case 0x63: case 0x65: case 0x67:
|
|
case 0x68: case 0x69: case 0x6A: case 0x6B: case 0x6C: case 0x6F:
|
|
case 0x78: case 0x79: case 0x7A: case 0x7B: case 0x7C: case 0x7D:
|
|
R8( op >> 3 & 7 ) = R8( op & 7 );
|
|
goto loop;
|
|
|
|
case 0x08: // LD IND16,SP
|
|
data = GET_ADDR();
|
|
pc += 2;
|
|
WRITE_MEM( this, data, sp );
|
|
data++;
|
|
WRITE_MEM( this, data, (sp >> 8) );
|
|
goto loop;
|
|
|
|
case 0xF9: // LD SP,HL
|
|
sp = RP.hl;
|
|
goto loop;
|
|
|
|
case 0x31: // LD SP,IMM
|
|
sp = GET_ADDR();
|
|
pc += 2;
|
|
goto loop;
|
|
|
|
case 0x01: // LD BC,IMM
|
|
case 0x11: // LD DE,IMM
|
|
R16( (unsigned) op >> 4 ) = GET_ADDR();
|
|
pc += 2;
|
|
goto loop;
|
|
|
|
case 0xE2: // LD (0xFF00+C),A
|
|
WRITE_IO( this, RG.c, RG.a );
|
|
goto loop;
|
|
|
|
case 0xE0: // LD (0xFF00+imm),A
|
|
pc++;
|
|
WRITE_IO( this, data, RG.a );
|
|
goto loop;
|
|
|
|
{
|
|
int temp;
|
|
case 0x32: // LD (HL-),A
|
|
temp = RP.hl;
|
|
RP.hl = temp - 1;
|
|
goto write_data_rg_a;
|
|
|
|
case 0x02: // LD (BC),A
|
|
temp = RP.bc;
|
|
goto write_data_rg_a;
|
|
|
|
case 0x12: // LD (DE),A
|
|
temp = RP.de;
|
|
goto write_data_rg_a;
|
|
|
|
case 0x22: // LD (HL+),A
|
|
temp = RP.hl;
|
|
RP.hl = temp + 1;
|
|
goto write_data_rg_a;
|
|
|
|
case 0xEA: // LD IND16,A (common)
|
|
temp = GET_ADDR();
|
|
pc += 2;
|
|
write_data_rg_a:
|
|
WRITE_MEM( this, temp, RG.a );
|
|
goto loop;
|
|
}
|
|
|
|
case 0x06: // LD B,IMM
|
|
RG.b = data;
|
|
pc++;
|
|
goto loop;
|
|
|
|
case 0x0E: // LD C,IMM
|
|
RG.c = data;
|
|
pc++;
|
|
goto loop;
|
|
|
|
case 0x16: // LD D,IMM
|
|
RG.d = data;
|
|
pc++;
|
|
goto loop;
|
|
|
|
case 0x1E: // LD E,IMM
|
|
RG.e = data;
|
|
pc++;
|
|
goto loop;
|
|
|
|
case 0x26: // LD H,IMM
|
|
RG.h = data;
|
|
pc++;
|
|
goto loop;
|
|
|
|
case 0x2E: // LD L,IMM
|
|
RG.l = data;
|
|
pc++;
|
|
goto loop;
|
|
|
|
case 0x36: // LD (HL),IMM
|
|
WRITE_MEM( this, RP.hl, data );
|
|
pc++;
|
|
goto loop;
|
|
|
|
case 0x3E: // LD A,IMM
|
|
RG.a = data;
|
|
pc++;
|
|
goto loop;
|
|
|
|
// Increment/decrement
|
|
|
|
case 0x03: // INC BC
|
|
case 0x13: // INC DE
|
|
case 0x23: // INC HL
|
|
R16( (unsigned) op >> 4 )++;
|
|
goto loop;
|
|
|
|
case 0x33: // INC SP
|
|
sp = WORD( sp + 1 );
|
|
goto loop;
|
|
|
|
case 0x0B: // DEC BC
|
|
case 0x1B: // DEC DE
|
|
case 0x2B: // DEC HL
|
|
R16( (unsigned) op >> 4 )--;
|
|
goto loop;
|
|
|
|
case 0x3B: // DEC SP
|
|
sp = WORD( sp - 1 );
|
|
goto loop;
|
|
|
|
case 0x34: // INC (HL)
|
|
op = RP.hl;
|
|
data = READ_MEM( this, op );
|
|
data++;
|
|
WRITE_MEM( this, op, data );
|
|
goto inc_comm;
|
|
|
|
case 0x04: // INC B
|
|
case 0x0C: // INC C (common)
|
|
case 0x14: // INC D
|
|
case 0x1C: // INC E
|
|
case 0x24: // INC H
|
|
case 0x2C: // INC L
|
|
case 0x3C: // INC A
|
|
op = op >> 3 & 7;
|
|
data = R8( op ) + 1;
|
|
R8( op ) = data;
|
|
inc_comm:
|
|
ph = data - 0x101; // N=0 H=*
|
|
cz = (cz & 0x100) + BYTE( data ); // C=- Z=*
|
|
goto loop;
|
|
|
|
case 0x35: // DEC (HL)
|
|
op = RP.hl;
|
|
data = READ_MEM( this, op );
|
|
data--;
|
|
WRITE_MEM( this, op, data );
|
|
goto dec_comm;
|
|
|
|
case 0x05: // DEC B
|
|
case 0x0D: // DEC C
|
|
case 0x15: // DEC D
|
|
case 0x1D: // DEC E
|
|
case 0x25: // DEC H
|
|
case 0x2D: // DEC L
|
|
case 0x3D: // DEC A
|
|
op = op >> 3 & 7;
|
|
data = R8( op ) - 1;
|
|
R8( op ) = data;
|
|
dec_comm:
|
|
ph = data + 1; // N=1 H=*
|
|
cz = (cz & 0x100) + BYTE( data ); // C=- Z=*
|
|
goto loop;
|
|
|
|
// Add 16-bit
|
|
|
|
case 0xF8: // LD HL,SP+n
|
|
case 0xE8:{// ADD SP,n
|
|
pc++;
|
|
int t = WORD( sp + SBYTE( data ) );
|
|
cz = ((BYTE( sp ) + data) & 0x100) + 1; // Z=0 C=*
|
|
ph = (sp ^ data ^ t) | 0x100; // N=0 H=*
|
|
if ( op == 0xF8 )
|
|
{
|
|
RP.hl = t;
|
|
goto loop;
|
|
}
|
|
sp = t;
|
|
goto loop;
|
|
}
|
|
|
|
case 0x39: // ADD HL,SP
|
|
data = sp;
|
|
goto add_hl_comm;
|
|
|
|
case 0x09: // ADD HL,BC
|
|
case 0x19: // ADD HL,DE
|
|
case 0x29: // ADD HL,HL
|
|
data = R16( (unsigned) op >> 4 );
|
|
add_hl_comm:
|
|
ph = RP.hl ^ data;
|
|
data += RP.hl;
|
|
RP.hl = WORD( data );
|
|
ph ^= data;
|
|
cz = BYTE( cz ) + (data >> 8 & 0x100); // C=* Z=-
|
|
ph = ((ph >> 8) ^ cz) | 0x100; // N=0 H=*
|
|
goto loop;
|
|
|
|
case 0x86: // ADD (HL)
|
|
data = READ_MEM( this, RP.hl );
|
|
goto add_comm;
|
|
|
|
case 0x80: // ADD B
|
|
case 0x81: // ADD C
|
|
case 0x82: // ADD D
|
|
case 0x83: // ADD E
|
|
case 0x84: // ADD H
|
|
case 0x85: // ADD L
|
|
case 0x87: // ADD A
|
|
data = R8( op & 7 );
|
|
goto add_comm;
|
|
|
|
case 0xC6: // ADD IMM
|
|
pc++;
|
|
add_comm:
|
|
ph = (RG.a ^ data) | 0x100; // N=1 H=*
|
|
cz = RG.a + data; // C=* Z=*
|
|
RG.a = cz;
|
|
goto loop;
|
|
|
|
// Add/Subtract
|
|
|
|
case 0x8E: // ADC (HL)
|
|
data = READ_MEM( this, RP.hl );
|
|
goto adc_comm;
|
|
|
|
case 0x88: // ADC B
|
|
case 0x89: // ADC C
|
|
case 0x8A: // ADC D
|
|
case 0x8B: // ADC E
|
|
case 0x8C: // ADC H
|
|
case 0x8D: // ADC L
|
|
case 0x8F: // ADC A
|
|
data = R8( op & 7 );
|
|
goto adc_comm;
|
|
|
|
case 0xCE: // ADC IMM
|
|
pc++;
|
|
adc_comm:
|
|
ph = (RG.a ^ data) | 0x100; // N=1 H=*
|
|
cz = RG.a + data + (cz >> 8 & 1); // C=* Z=*
|
|
RG.a = cz;
|
|
goto loop;
|
|
|
|
case 0x96: // SUB (HL)
|
|
data = READ_MEM( this, RP.hl );
|
|
goto sub_comm;
|
|
|
|
case 0x90: // SUB B
|
|
case 0x91: // SUB C
|
|
case 0x92: // SUB D
|
|
case 0x93: // SUB E
|
|
case 0x94: // SUB H
|
|
case 0x95: // SUB L
|
|
case 0x97: // SUB A
|
|
data = R8( op & 7 );
|
|
goto sub_comm;
|
|
|
|
case 0xD6: // SUB IMM
|
|
pc++;
|
|
sub_comm:
|
|
ph = RG.a ^ data; // N=1 H=*
|
|
cz = RG.a - data; // C=* Z=*
|
|
RG.a = cz;
|
|
goto loop;
|
|
|
|
case 0x9E: // SBC (HL)
|
|
data = READ_MEM( this, RP.hl );
|
|
goto sbc_comm;
|
|
|
|
case 0x98: // SBC B
|
|
case 0x99: // SBC C
|
|
case 0x9A: // SBC D
|
|
case 0x9B: // SBC E
|
|
case 0x9C: // SBC H
|
|
case 0x9D: // SBC L
|
|
case 0x9F: // SBC A
|
|
data = R8( op & 7 );
|
|
goto sbc_comm;
|
|
|
|
case 0xDE: // SBC IMM
|
|
pc++;
|
|
sbc_comm:
|
|
ph = RG.a ^ data; // N=1 H=*
|
|
cz = RG.a - data - (cz >> 8 & 1); // C=* Z=*
|
|
RG.a = cz;
|
|
goto loop;
|
|
|
|
// Logical
|
|
|
|
case 0xA0: // AND B
|
|
case 0xA1: // AND C
|
|
case 0xA2: // AND D
|
|
case 0xA3: // AND E
|
|
case 0xA4: // AND H
|
|
case 0xA5: // AND L
|
|
data = R8( op & 7 );
|
|
goto and_comm;
|
|
|
|
case 0xA6: // AND (HL)
|
|
data = READ_MEM( this, RP.hl );
|
|
goto and_comm;
|
|
case 0xE6: // AND IMM
|
|
pc++;
|
|
and_comm:
|
|
cz = RG.a & data; // C=0 Z=*
|
|
ph = ~cz; // N=0 H=1
|
|
RG.a = cz;
|
|
goto loop;
|
|
|
|
case 0xA7: // AND A
|
|
cz = RG.a; // C=0 Z=*
|
|
ph = ~RG.a; // N=0 H=1
|
|
goto loop;
|
|
|
|
case 0xB0: // OR B
|
|
case 0xB1: // OR C
|
|
case 0xB2: // OR D
|
|
case 0xB3: // OR E
|
|
case 0xB4: // OR H
|
|
case 0xB5: // OR L
|
|
data = R8( op & 7 );
|
|
goto or_comm;
|
|
|
|
case 0xB6: // OR (HL)
|
|
data = READ_MEM( this, RP.hl );
|
|
goto or_comm;
|
|
case 0xF6: // OR IMM
|
|
pc++;
|
|
or_comm:
|
|
cz = RG.a | data; // C=0 Z=*
|
|
ph = cz | 0x100; // N=0 H=0
|
|
RG.a = cz;
|
|
goto loop;
|
|
|
|
case 0xB7: // OR A
|
|
cz = RG.a; // C=0 Z=*
|
|
ph = RG.a + 0x100; // N=0 H=0
|
|
goto loop;
|
|
|
|
case 0xA8: // XOR B
|
|
case 0xA9: // XOR C
|
|
case 0xAA: // XOR D
|
|
case 0xAB: // XOR E
|
|
case 0xAC: // XOR H
|
|
case 0xAD: // XOR L
|
|
data = R8( op & 7 );
|
|
goto xor_comm;
|
|
|
|
case 0xAE: // XOR (HL)
|
|
data = READ_MEM( this, RP.hl );
|
|
pc--;
|
|
case 0xEE: // XOR IMM
|
|
pc++;
|
|
xor_comm:
|
|
cz = RG.a ^ data; // C=0 Z=*
|
|
ph = cz + 0x100; // N=0 H=0
|
|
RG.a = cz;
|
|
goto loop;
|
|
|
|
case 0xAF: // XOR A
|
|
RG.a = 0;
|
|
cz = 0; // C=0 Z=*
|
|
ph = 0x100; // N=0 H=0
|
|
goto loop;
|
|
|
|
// Stack
|
|
|
|
case 0xF1: // POP AF
|
|
case 0xC1: // POP BC
|
|
case 0xD1: // POP DE
|
|
case 0xE1: // POP HL (common)
|
|
data = READ_MEM( this, sp );
|
|
R16( op >> 4 & 3 ) = data + 0x100 * READ_MEM( this, (sp + 1) );
|
|
sp = WORD( sp + 2 );
|
|
if ( op != 0xF1 )
|
|
goto loop;
|
|
|
|
SET_FLAGS( RG.a );
|
|
RG.a = RG.flags;
|
|
goto loop;
|
|
|
|
case 0xC5: // PUSH BC
|
|
data = RP.bc;
|
|
goto push;
|
|
|
|
case 0xD5: // PUSH DE
|
|
data = RP.de;
|
|
goto push;
|
|
|
|
case 0xE5: // PUSH HL
|
|
data = RP.hl;
|
|
goto push;
|
|
|
|
case 0xF5: // PUSH AF
|
|
GET_FLAGS( data );
|
|
data += RG.a << 8;
|
|
goto push;
|
|
|
|
// Flow control
|
|
|
|
case 0xFF: case 0xC7: case 0xCF: case 0xD7: // RST
|
|
case 0xDF: case 0xE7: case 0xEF: case 0xF7:
|
|
data = pc;
|
|
pc = (op & 0x38) + cpu->rst_base;
|
|
goto push;
|
|
|
|
case 0xCC: // CALL Z
|
|
pc += 2;
|
|
if ( CC_Z() )
|
|
goto call;
|
|
goto loop;
|
|
|
|
case 0xD4: // CALL NC
|
|
pc += 2;
|
|
if ( CC_NC() )
|
|
goto call;
|
|
goto loop;
|
|
|
|
case 0xDC: // CALL C
|
|
pc += 2;
|
|
if ( CC_C() )
|
|
goto call;
|
|
goto loop;
|
|
|
|
case 0xC0: // RET NZ
|
|
if ( CC_NZ() )
|
|
goto ret;
|
|
goto loop;
|
|
|
|
case 0xD0: // RET NC
|
|
if ( CC_NC() )
|
|
goto ret;
|
|
goto loop;
|
|
|
|
case 0xD8: // RET C
|
|
if ( CC_C() )
|
|
goto ret;
|
|
goto loop;
|
|
|
|
case 0x18: // JR
|
|
BRANCH_( true, 0 )
|
|
|
|
case 0x30: // JR NC
|
|
BRANCH( CC_NC() )
|
|
|
|
case 0x38: // JR C
|
|
BRANCH( CC_C() )
|
|
|
|
case 0xE9: // LD PC,HL
|
|
pc = RP.hl;
|
|
goto loop;
|
|
|
|
case 0xC3: // JP (next-most-common)
|
|
pc = GET_ADDR();
|
|
goto loop;
|
|
|
|
case 0xC2: // JP NZ
|
|
pc += 2;
|
|
if ( CC_NZ() )
|
|
goto jp_taken;
|
|
time -= 4;
|
|
goto loop;
|
|
|
|
case 0xCA: // JP Z (most common)
|
|
pc += 2;
|
|
if ( CC_Z() )
|
|
goto jp_taken;
|
|
time -= 4;
|
|
goto loop;
|
|
|
|
jp_taken:
|
|
pc -= 2;
|
|
pc = GET_ADDR();
|
|
goto loop;
|
|
|
|
case 0xD2: // JP NC
|
|
pc += 2;
|
|
if ( CC_NC() )
|
|
goto jp_taken;
|
|
time -= 4;
|
|
goto loop;
|
|
|
|
case 0xDA: // JP C
|
|
pc += 2;
|
|
if ( CC_C() )
|
|
goto jp_taken;
|
|
time -= 4;
|
|
goto loop;
|
|
|
|
// Flags
|
|
|
|
case 0x2F: // CPL
|
|
RG.a = ~RG.a;
|
|
ph = BYTE( ~cz ); // N=1 H=1
|
|
goto loop;
|
|
|
|
case 0x3F: // CCF
|
|
ph = cz | 0x100; // N=0 H=0
|
|
cz ^= 0x100; // C=* Z=-
|
|
goto loop;
|
|
|
|
case 0x37: // SCF
|
|
ph = cz | 0x100; // N=0 H=0
|
|
cz |= 0x100; // C=1 Z=-
|
|
goto loop;
|
|
|
|
case 0xF3: // DI
|
|
goto loop;
|
|
|
|
case 0xFB: // EI
|
|
goto loop;
|
|
|
|
case 0x27:{// DAA
|
|
unsigned a = RG.a;
|
|
int h = ph ^ cz;
|
|
if ( ph & 0x100 )
|
|
{
|
|
if ( (h & 0x10) || (a & 0x0F) > 9 )
|
|
a += 6;
|
|
|
|
if ( (cz & 0x100) || a > 0x9F )
|
|
a += 0x60;
|
|
}
|
|
else
|
|
{
|
|
if ( h & 0x10 )
|
|
a = (a - 6) & 0xFF;
|
|
|
|
if ( cz & 0x100 )
|
|
a -= 0x60;
|
|
}
|
|
cz = (cz & 0x100) | a; // C=- Z=*
|
|
RG.a = a;
|
|
ph = (ph & 0x100) + BYTE( a ); // N=- H=0
|
|
goto loop;
|
|
}
|
|
|
|
// Special
|
|
|
|
case 0x76: // HALT
|
|
case 0x10: // STOP
|
|
case 0xD3: case 0xDB: case 0xDD: // Illegal
|
|
case 0xE3: case 0xE4: case 0xEB: case 0xEC: case 0xED: // (all freeze cpu)
|
|
case 0xF4: case 0xFC: case 0xFD:
|
|
goto stop;
|
|
}
|
|
|
|
// If this fails then an opcode isn't handled above
|
|
assert( false );
|
|
|
|
stop:
|
|
pc--;
|
|
|
|
// copy state back
|
|
cpu->cpu_state_.time = time;
|
|
cpu->r.pc = pc;
|
|
cpu->r.sp = sp;
|
|
{
|
|
int t;
|
|
GET_FLAGS( t );
|
|
RG.flags = t;
|
|
}
|
|
cpu->cpu_state = &cpu->cpu_state_;
|
|
cpu->r.rp = RP;
|
|
}
|