mirror of
https://github.com/dborth/snes9xgx.git
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1221 lines
23 KiB
C
1221 lines
23 KiB
C
// snes_spc 0.9.0. http://www.slack.net/~ant/
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/* Copyright (C) 2004-2007 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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//// Memory access
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#if SPC_MORE_ACCURACY
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#define SUSPICIOUS_OPCODE( name ) ((void) 0)
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#else
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#define SUSPICIOUS_OPCODE( name ) dprintf( "SPC: suspicious opcode: " name "\n" )
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#endif
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#define CPU_READ( time, offset, addr )\
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cpu_read( addr, time + offset )
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#define CPU_WRITE( time, offset, addr, data )\
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cpu_write( data, addr, time + offset )
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#if SPC_MORE_ACCURACY
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#define CPU_READ_TIMER( time, offset, addr, out )\
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{ out = CPU_READ( time, offset, addr ); }
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#else
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// timers are by far the most common thing read from dp
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#define CPU_READ_TIMER( time, offset, addr_, out )\
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{\
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rel_time_t adj_time = time + offset;\
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int dp_addr = addr_;\
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int ti = dp_addr - (r_t0out + 0xF0);\
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if ( (unsigned) ti < timer_count )\
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{\
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Timer* t = &m.timers [ti];\
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if ( adj_time >= t->next_time )\
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t = run_timer_( t, adj_time );\
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out = t->counter;\
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t->counter = 0;\
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}\
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else\
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{\
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out = ram [dp_addr];\
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int i = dp_addr - 0xF0;\
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if ( (unsigned) i < 0x10 )\
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out = cpu_read_smp_reg( i, adj_time );\
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}\
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}
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#endif
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#define TIME_ADJ( n ) (n)
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#define READ_TIMER( time, addr, out ) CPU_READ_TIMER( rel_time, TIME_ADJ(time), (addr), out )
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#define READ( time, addr ) CPU_READ ( rel_time, TIME_ADJ(time), (addr) )
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#define WRITE( time, addr, data ) CPU_WRITE( rel_time, TIME_ADJ(time), (addr), (data) )
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#define DP_ADDR( addr ) (dp + (addr))
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#define READ_DP_TIMER( time, addr, out ) CPU_READ_TIMER( rel_time, TIME_ADJ(time), DP_ADDR( addr ), out )
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#define READ_DP( time, addr ) READ ( time, DP_ADDR( addr ) )
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#define WRITE_DP( time, addr, data ) WRITE( time, DP_ADDR( addr ), data )
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#define READ_PROG16( addr ) GET_LE16( ram + (addr) )
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#define SET_PC( n ) (pc = ram + (n))
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#define GET_PC() (pc - ram)
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#define READ_PC( pc ) (*(pc))
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#define READ_PC16( pc ) GET_LE16( pc )
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// TODO: remove non-wrapping versions?
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#define SPC_NO_SP_WRAPAROUND 0
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#define SET_SP( v ) (sp = ram + 0x101 + (v))
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#define GET_SP() (sp - 0x101 - ram)
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#if SPC_NO_SP_WRAPAROUND
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#define PUSH16( v ) (sp -= 2, SET_LE16( sp, v ))
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#define PUSH( v ) (void) (*--sp = (uint8_t) (v))
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#define POP( out ) (void) ((out) = *sp++)
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#else
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#define PUSH16( data )\
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{\
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int addr = (sp -= 2) - ram;\
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if ( addr > 0x100 )\
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{\
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SET_LE16( sp, data );\
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}\
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else\
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{\
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ram [(uint8_t) addr + 0x100] = (uint8_t) data;\
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sp [1] = (uint8_t) (data >> 8);\
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sp += 0x100;\
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}\
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}
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#define PUSH( data )\
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{\
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*--sp = (uint8_t) (data);\
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if ( sp - ram == 0x100 )\
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sp += 0x100;\
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}
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#define POP( out )\
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{\
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out = *sp++;\
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if ( sp - ram == 0x201 )\
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{\
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out = sp [-0x101];\
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sp -= 0x100;\
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}\
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}
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#endif
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#define MEM_BIT( rel ) CPU_mem_bit( pc, rel_time + rel )
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unsigned SNES_SPC::CPU_mem_bit( uint8_t const* pc, rel_time_t rel_time )
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{
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unsigned addr = READ_PC16( pc );
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unsigned t = READ( 0, addr & 0x1FFF ) >> (addr >> 13);
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return t << 8 & 0x100;
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}
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//// Status flag handling
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// Hex value in name to clarify code and bit shifting.
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// Flag stored in indicated variable during emulation
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int const n80 = 0x80; // nz
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int const v40 = 0x40; // psw
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int const p20 = 0x20; // dp
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int const b10 = 0x10; // psw
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int const h08 = 0x08; // psw
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int const i04 = 0x04; // psw
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int const z02 = 0x02; // nz
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int const c01 = 0x01; // c
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int const nz_neg_mask = 0x880; // either bit set indicates N flag set
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#define GET_PSW( out )\
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{\
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out = psw & ~(n80 | p20 | z02 | c01);\
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out |= c >> 8 & c01;\
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out |= dp >> 3 & p20;\
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out |= ((nz >> 4) | nz) & n80;\
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if ( !(uint8_t) nz ) out |= z02;\
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}
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#define SET_PSW( in )\
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{\
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psw = in;\
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c = in << 8;\
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dp = in << 3 & 0x100;\
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nz = (in << 4 & 0x800) | (~in & z02);\
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}
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SPC_CPU_RUN_FUNC
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{
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uint8_t* const ram = RAM;
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int a = m.cpu_regs.a;
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int x = m.cpu_regs.x;
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int y = m.cpu_regs.y;
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uint8_t const* pc;
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uint8_t* sp;
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int psw;
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int c;
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int nz;
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int dp;
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SET_PC( m.cpu_regs.pc );
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SET_SP( m.cpu_regs.sp );
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SET_PSW( m.cpu_regs.psw );
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goto loop;
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// Main loop
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cbranch_taken_loop:
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pc += *(BOOST::int8_t const*) pc;
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inc_pc_loop:
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pc++;
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loop:
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{
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unsigned opcode;
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unsigned data;
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check( (unsigned) a < 0x100 );
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check( (unsigned) x < 0x100 );
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check( (unsigned) y < 0x100 );
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opcode = *pc;
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if ( (rel_time += m.cycle_table [opcode]) > 0 )
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goto out_of_time;
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#ifdef SPC_CPU_OPCODE_HOOK
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SPC_CPU_OPCODE_HOOK( GET_PC(), opcode );
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#endif
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/*
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//SUB_CASE_COUNTER( 1 );
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#define PROFILE_TIMER_LOOP( op, addr, len )\
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if ( opcode == op )\
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{\
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int cond = (unsigned) ((addr) - 0xFD) < 3 &&\
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pc [len] == 0xF0 && pc [len+1] == 0xFE - len;\
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SUB_CASE_COUNTER( op && cond );\
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}
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PROFILE_TIMER_LOOP( 0xEC, GET_LE16( pc + 1 ), 3 );
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PROFILE_TIMER_LOOP( 0xEB, pc [1], 2 );
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PROFILE_TIMER_LOOP( 0xE4, pc [1], 2 );
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*/
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// TODO: if PC is at end of memory, this will get wrong operand (very obscure)
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data = *++pc;
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switch ( opcode )
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{
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// Common instructions
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#define BRANCH( cond )\
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{\
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pc++;\
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pc += (BOOST::int8_t) data;\
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if ( cond )\
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goto loop;\
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pc -= (BOOST::int8_t) data;\
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rel_time -= 2;\
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goto loop;\
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}
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case 0xF0: // BEQ
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BRANCH( !(uint8_t) nz ) // 89% taken
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case 0xD0: // BNE
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BRANCH( (uint8_t) nz )
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case 0x3F:{// CALL
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int old_addr = GET_PC() + 2;
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SET_PC( READ_PC16( pc ) );
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PUSH16( old_addr );
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goto loop;
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}
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case 0x6F:// RET
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#if SPC_NO_SP_WRAPAROUND
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{
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SET_PC( GET_LE16( sp ) );
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sp += 2;
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}
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#else
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{
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int addr = sp - ram;
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SET_PC( GET_LE16( sp ) );
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sp += 2;
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if ( addr < 0x1FF )
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goto loop;
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SET_PC( sp [-0x101] * 0x100 + ram [(uint8_t) addr + 0x100] );
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sp -= 0x100;
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}
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#endif
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goto loop;
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case 0xE4: // MOV a,dp
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++pc;
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// 80% from timer
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READ_DP_TIMER( 0, data, a = nz );
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goto loop;
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case 0xFA:{// MOV dp,dp
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int temp;
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READ_DP_TIMER( -2, data, temp );
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data = temp + no_read_before_write ;
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}
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// fall through
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case 0x8F:{// MOV dp,#imm
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int temp = READ_PC( pc + 1 );
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pc += 2;
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#if !SPC_MORE_ACCURACY
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{
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int i = dp + temp;
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ram [i] = (uint8_t) data;
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i -= 0xF0;
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if ( (unsigned) i < 0x10 ) // 76%
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{
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REGS [i] = (uint8_t) data;
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// Registers other than $F2 and $F4-$F7
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//if ( i != 2 && i != 4 && i != 5 && i != 6 && i != 7 )
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if ( ((~0x2F00 << (bits_in_int - 16)) << i) < 0 ) // 12%
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cpu_write_smp_reg( data, rel_time, i );
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}
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}
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#else
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WRITE_DP( 0, temp, data );
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#endif
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goto loop;
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}
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case 0xC4: // MOV dp,a
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++pc;
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#if !SPC_MORE_ACCURACY
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{
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int i = dp + data;
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ram [i] = (uint8_t) a;
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i -= 0xF0;
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if ( (unsigned) i < 0x10 ) // 39%
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{
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unsigned sel = i - 2;
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REGS [i] = (uint8_t) a;
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if ( sel == 1 ) // 51% $F3
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dsp_write( a, rel_time );
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else if ( sel > 1 ) // 1% not $F2 or $F3
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cpu_write_smp_reg_( a, rel_time, i );
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}
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}
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#else
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WRITE_DP( 0, data, a );
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#endif
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goto loop;
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#define CASE( n ) case n:
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// Define common address modes based on opcode for immediate mode. Execution
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// ends with data set to the address of the operand.
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#define ADDR_MODES_( op )\
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CASE( op - 0x02 ) /* (X) */\
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data = x + dp;\
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pc--;\
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goto end_##op;\
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CASE( op + 0x0F ) /* (dp)+Y */\
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data = READ_PROG16( data + dp ) + y;\
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goto end_##op;\
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CASE( op - 0x01 ) /* (dp+X) */\
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data = READ_PROG16( ((uint8_t) (data + x)) + dp );\
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goto end_##op;\
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CASE( op + 0x0E ) /* abs+Y */\
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data += y;\
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goto abs_##op;\
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CASE( op + 0x0D ) /* abs+X */\
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data += x;\
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CASE( op - 0x03 ) /* abs */\
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abs_##op:\
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data += 0x100 * READ_PC( ++pc );\
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goto end_##op;\
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CASE( op + 0x0C ) /* dp+X */\
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data = (uint8_t) (data + x);
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#define ADDR_MODES_NO_DP( op )\
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ADDR_MODES_( op )\
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data += dp;\
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end_##op:
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#define ADDR_MODES( op )\
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ADDR_MODES_( op )\
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CASE( op - 0x04 ) /* dp */\
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data += dp;\
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end_##op:
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// 1. 8-bit Data Transmission Commands. Group I
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ADDR_MODES_NO_DP( 0xE8 ) // MOV A,addr
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a = nz = READ( 0, data );
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goto inc_pc_loop;
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case 0xBF:{// MOV A,(X)+
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int temp = x + dp;
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x = (uint8_t) (x + 1);
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a = nz = READ( -1, temp );
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goto loop;
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}
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case 0xE8: // MOV A,imm
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a = data;
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nz = data;
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goto inc_pc_loop;
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case 0xF9: // MOV X,dp+Y
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data = (uint8_t) (data + y);
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case 0xF8: // MOV X,dp
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READ_DP_TIMER( 0, data, x = nz );
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goto inc_pc_loop;
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case 0xE9: // MOV X,abs
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data = READ_PC16( pc );
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++pc;
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data = READ( 0, data );
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case 0xCD: // MOV X,imm
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x = data;
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nz = data;
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goto inc_pc_loop;
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case 0xFB: // MOV Y,dp+X
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data = (uint8_t) (data + x);
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case 0xEB: // MOV Y,dp
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// 70% from timer
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pc++;
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READ_DP_TIMER( 0, data, y = nz );
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goto loop;
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case 0xEC:{// MOV Y,abs
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int temp = READ_PC16( pc );
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pc += 2;
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READ_TIMER( 0, temp, y = nz );
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//y = nz = READ( 0, temp );
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goto loop;
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}
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case 0x8D: // MOV Y,imm
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y = data;
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nz = data;
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goto inc_pc_loop;
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// 2. 8-BIT DATA TRANSMISSION COMMANDS, GROUP 2
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ADDR_MODES_NO_DP( 0xC8 ) // MOV addr,A
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WRITE( 0, data, a );
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goto inc_pc_loop;
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{
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int temp;
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case 0xCC: // MOV abs,Y
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temp = y;
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goto mov_abs_temp;
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case 0xC9: // MOV abs,X
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temp = x;
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mov_abs_temp:
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WRITE( 0, READ_PC16( pc ), temp );
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pc += 2;
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goto loop;
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}
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case 0xD9: // MOV dp+Y,X
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data = (uint8_t) (data + y);
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case 0xD8: // MOV dp,X
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WRITE( 0, data + dp, x );
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goto inc_pc_loop;
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case 0xDB: // MOV dp+X,Y
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data = (uint8_t) (data + x);
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case 0xCB: // MOV dp,Y
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WRITE( 0, data + dp, y );
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goto inc_pc_loop;
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// 3. 8-BIT DATA TRANSMISSIN COMMANDS, GROUP 3.
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case 0x7D: // MOV A,X
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a = x;
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nz = x;
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goto loop;
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case 0xDD: // MOV A,Y
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a = y;
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nz = y;
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goto loop;
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case 0x5D: // MOV X,A
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x = a;
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nz = a;
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goto loop;
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case 0xFD: // MOV Y,A
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y = a;
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nz = a;
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goto loop;
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case 0x9D: // MOV X,SP
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x = nz = GET_SP();
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goto loop;
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case 0xBD: // MOV SP,X
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SET_SP( x );
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goto loop;
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//case 0xC6: // MOV (X),A (handled by MOV addr,A in group 2)
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case 0xAF: // MOV (X)+,A
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WRITE_DP( 0, x, a + no_read_before_write );
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x++;
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goto loop;
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// 5. 8-BIT LOGIC OPERATION COMMANDS
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#define LOGICAL_OP( op, func )\
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ADDR_MODES( op ) /* addr */\
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data = READ( 0, data );\
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case op: /* imm */\
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nz = a func##= data;\
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goto inc_pc_loop;\
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{ unsigned addr;\
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case op + 0x11: /* X,Y */\
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data = READ_DP( -2, y );\
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addr = x + dp;\
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goto addr_##op;\
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case op + 0x01: /* dp,dp */\
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data = READ_DP( -3, data );\
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case op + 0x10:{/*dp,imm*/\
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uint8_t const* addr2 = pc + 1;\
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pc += 2;\
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addr = READ_PC( addr2 ) + dp;\
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}\
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addr_##op:\
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nz = data func READ( -1, addr );\
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WRITE( 0, addr, nz );\
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goto loop;\
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}
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LOGICAL_OP( 0x28, & ); // AND
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LOGICAL_OP( 0x08, | ); // OR
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LOGICAL_OP( 0x48, ^ ); // EOR
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// 4. 8-BIT ARITHMETIC OPERATION COMMANDS
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ADDR_MODES( 0x68 ) // CMP addr
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data = READ( 0, data );
|
|
case 0x68: // CMP imm
|
|
nz = a - data;
|
|
c = ~nz;
|
|
nz &= 0xFF;
|
|
goto inc_pc_loop;
|
|
|
|
case 0x79: // CMP (X),(Y)
|
|
data = READ_DP( -2, y );
|
|
nz = READ_DP( -1, x ) - data;
|
|
c = ~nz;
|
|
nz &= 0xFF;
|
|
goto loop;
|
|
|
|
case 0x69: // CMP dp,dp
|
|
data = READ_DP( -3, data );
|
|
case 0x78: // CMP dp,imm
|
|
nz = READ_DP( -1, READ_PC( ++pc ) ) - data;
|
|
c = ~nz;
|
|
nz &= 0xFF;
|
|
goto inc_pc_loop;
|
|
|
|
case 0x3E: // CMP X,dp
|
|
data += dp;
|
|
goto cmp_x_addr;
|
|
case 0x1E: // CMP X,abs
|
|
data = READ_PC16( pc );
|
|
pc++;
|
|
cmp_x_addr:
|
|
data = READ( 0, data );
|
|
case 0xC8: // CMP X,imm
|
|
nz = x - data;
|
|
c = ~nz;
|
|
nz &= 0xFF;
|
|
goto inc_pc_loop;
|
|
|
|
case 0x7E: // CMP Y,dp
|
|
data += dp;
|
|
goto cmp_y_addr;
|
|
case 0x5E: // CMP Y,abs
|
|
data = READ_PC16( pc );
|
|
pc++;
|
|
cmp_y_addr:
|
|
data = READ( 0, data );
|
|
case 0xAD: // CMP Y,imm
|
|
nz = y - data;
|
|
c = ~nz;
|
|
nz &= 0xFF;
|
|
goto inc_pc_loop;
|
|
|
|
{
|
|
int addr;
|
|
case 0xB9: // SBC (x),(y)
|
|
case 0x99: // ADC (x),(y)
|
|
pc--; // compensate for inc later
|
|
data = READ_DP( -2, y );
|
|
addr = x + dp;
|
|
goto adc_addr;
|
|
case 0xA9: // SBC dp,dp
|
|
case 0x89: // ADC dp,dp
|
|
data = READ_DP( -3, data );
|
|
case 0xB8: // SBC dp,imm
|
|
case 0x98: // ADC dp,imm
|
|
addr = READ_PC( ++pc ) + dp;
|
|
adc_addr:
|
|
nz = READ( -1, addr );
|
|
goto adc_data;
|
|
|
|
// catch ADC and SBC together, then decode later based on operand
|
|
#undef CASE
|
|
#define CASE( n ) case n: case (n) + 0x20:
|
|
ADDR_MODES( 0x88 ) // ADC/SBC addr
|
|
data = READ( 0, data );
|
|
case 0xA8: // SBC imm
|
|
case 0x88: // ADC imm
|
|
addr = -1; // A
|
|
nz = a;
|
|
adc_data: {
|
|
int flags;
|
|
if ( opcode >= 0xA0 ) // SBC
|
|
data ^= 0xFF;
|
|
|
|
flags = data ^ nz;
|
|
nz += data + (c >> 8 & 1);
|
|
flags ^= nz;
|
|
|
|
psw = (psw & ~(v40 | h08)) |
|
|
(flags >> 1 & h08) |
|
|
((flags + 0x80) >> 2 & v40);
|
|
c = nz;
|
|
if ( addr < 0 )
|
|
{
|
|
a = (uint8_t) nz;
|
|
goto inc_pc_loop;
|
|
}
|
|
WRITE( 0, addr, /*(uint8_t)*/ nz );
|
|
goto inc_pc_loop;
|
|
}
|
|
|
|
}
|
|
|
|
// 6. ADDITION & SUBTRACTION COMMANDS
|
|
|
|
#define INC_DEC_REG( reg, op )\
|
|
nz = reg op;\
|
|
reg = (uint8_t) nz;\
|
|
goto loop;
|
|
|
|
case 0xBC: INC_DEC_REG( a, + 1 ) // INC A
|
|
case 0x3D: INC_DEC_REG( x, + 1 ) // INC X
|
|
case 0xFC: INC_DEC_REG( y, + 1 ) // INC Y
|
|
|
|
case 0x9C: INC_DEC_REG( a, - 1 ) // DEC A
|
|
case 0x1D: INC_DEC_REG( x, - 1 ) // DEC X
|
|
case 0xDC: INC_DEC_REG( y, - 1 ) // DEC Y
|
|
|
|
case 0x9B: // DEC dp+X
|
|
case 0xBB: // INC dp+X
|
|
data = (uint8_t) (data + x);
|
|
case 0x8B: // DEC dp
|
|
case 0xAB: // INC dp
|
|
data += dp;
|
|
goto inc_abs;
|
|
case 0x8C: // DEC abs
|
|
case 0xAC: // INC abs
|
|
data = READ_PC16( pc );
|
|
pc++;
|
|
inc_abs:
|
|
nz = (opcode >> 4 & 2) - 1;
|
|
nz += READ( -1, data );
|
|
WRITE( 0, data, /*(uint8_t)*/ nz );
|
|
goto inc_pc_loop;
|
|
|
|
// 7. SHIFT, ROTATION COMMANDS
|
|
|
|
case 0x5C: // LSR A
|
|
c = 0;
|
|
case 0x7C:{// ROR A
|
|
nz = (c >> 1 & 0x80) | (a >> 1);
|
|
c = a << 8;
|
|
a = nz;
|
|
goto loop;
|
|
}
|
|
|
|
case 0x1C: // ASL A
|
|
c = 0;
|
|
case 0x3C:{// ROL A
|
|
int temp = c >> 8 & 1;
|
|
c = a << 1;
|
|
nz = c | temp;
|
|
a = (uint8_t) nz;
|
|
goto loop;
|
|
}
|
|
|
|
case 0x0B: // ASL dp
|
|
c = 0;
|
|
data += dp;
|
|
goto rol_mem;
|
|
case 0x1B: // ASL dp+X
|
|
c = 0;
|
|
case 0x3B: // ROL dp+X
|
|
data = (uint8_t) (data + x);
|
|
case 0x2B: // ROL dp
|
|
data += dp;
|
|
goto rol_mem;
|
|
case 0x0C: // ASL abs
|
|
c = 0;
|
|
case 0x2C: // ROL abs
|
|
data = READ_PC16( pc );
|
|
pc++;
|
|
rol_mem:
|
|
nz = c >> 8 & 1;
|
|
nz |= (c = READ( -1, data ) << 1);
|
|
WRITE( 0, data, /*(uint8_t)*/ nz );
|
|
goto inc_pc_loop;
|
|
|
|
case 0x4B: // LSR dp
|
|
c = 0;
|
|
data += dp;
|
|
goto ror_mem;
|
|
case 0x5B: // LSR dp+X
|
|
c = 0;
|
|
case 0x7B: // ROR dp+X
|
|
data = (uint8_t) (data + x);
|
|
case 0x6B: // ROR dp
|
|
data += dp;
|
|
goto ror_mem;
|
|
case 0x4C: // LSR abs
|
|
c = 0;
|
|
case 0x6C: // ROR abs
|
|
data = READ_PC16( pc );
|
|
pc++;
|
|
ror_mem: {
|
|
int temp = READ( -1, data );
|
|
nz = (c >> 1 & 0x80) | (temp >> 1);
|
|
c = temp << 8;
|
|
WRITE( 0, data, nz );
|
|
goto inc_pc_loop;
|
|
}
|
|
|
|
case 0x9F: // XCN
|
|
nz = a = (a >> 4) | (uint8_t) (a << 4);
|
|
goto loop;
|
|
|
|
// 8. 16-BIT TRANSMISION COMMANDS
|
|
|
|
case 0xBA: // MOVW YA,dp
|
|
a = READ_DP( -2, data );
|
|
nz = (a & 0x7F) | (a >> 1);
|
|
y = READ_DP( 0, (uint8_t) (data + 1) );
|
|
nz |= y;
|
|
goto inc_pc_loop;
|
|
|
|
case 0xDA: // MOVW dp,YA
|
|
WRITE_DP( -1, data, a );
|
|
WRITE_DP( 0, (uint8_t) (data + 1), y + no_read_before_write );
|
|
goto inc_pc_loop;
|
|
|
|
// 9. 16-BIT OPERATION COMMANDS
|
|
|
|
case 0x3A: // INCW dp
|
|
case 0x1A:{// DECW dp
|
|
int temp;
|
|
// low byte
|
|
data += dp;
|
|
temp = READ( -3, data );
|
|
temp += (opcode >> 4 & 2) - 1; // +1 for INCW, -1 for DECW
|
|
nz = ((temp >> 1) | temp) & 0x7F;
|
|
WRITE( -2, data, /*(uint8_t)*/ temp );
|
|
|
|
// high byte
|
|
data = (uint8_t) (data + 1) + dp;
|
|
temp = (uint8_t) ((temp >> 8) + READ( -1, data ));
|
|
nz |= temp;
|
|
WRITE( 0, data, temp );
|
|
|
|
goto inc_pc_loop;
|
|
}
|
|
|
|
case 0x7A: // ADDW YA,dp
|
|
case 0x9A:{// SUBW YA,dp
|
|
int lo = READ_DP( -2, data );
|
|
int hi = READ_DP( 0, (uint8_t) (data + 1) );
|
|
int result;
|
|
int flags;
|
|
|
|
if ( opcode == 0x9A ) // SUBW
|
|
{
|
|
lo = (lo ^ 0xFF) + 1;
|
|
hi ^= 0xFF;
|
|
}
|
|
|
|
lo += a;
|
|
result = y + hi + (lo >> 8);
|
|
flags = hi ^ y ^ result;
|
|
|
|
psw = (psw & ~(v40 | h08)) |
|
|
(flags >> 1 & h08) |
|
|
((flags + 0x80) >> 2 & v40);
|
|
c = result;
|
|
a = (uint8_t) lo;
|
|
result = (uint8_t) result;
|
|
y = result;
|
|
nz = (((lo >> 1) | lo) & 0x7F) | result;
|
|
|
|
goto inc_pc_loop;
|
|
}
|
|
|
|
case 0x5A: { // CMPW YA,dp
|
|
int temp = a - READ_DP( -1, data );
|
|
nz = ((temp >> 1) | temp) & 0x7F;
|
|
temp = y + (temp >> 8);
|
|
temp -= READ_DP( 0, (uint8_t) (data + 1) );
|
|
nz |= temp;
|
|
c = ~temp;
|
|
nz &= 0xFF;
|
|
goto inc_pc_loop;
|
|
}
|
|
|
|
// 10. MULTIPLICATION & DIVISON COMMANDS
|
|
|
|
case 0xCF: { // MUL YA
|
|
unsigned temp = y * a;
|
|
a = (uint8_t) temp;
|
|
nz = ((temp >> 1) | temp) & 0x7F;
|
|
y = temp >> 8;
|
|
nz |= y;
|
|
goto loop;
|
|
}
|
|
|
|
case 0x9E: // DIV YA,X
|
|
{
|
|
unsigned ya = y * 0x100 + a;
|
|
|
|
psw &= ~(h08 | v40);
|
|
|
|
if ( y >= x )
|
|
psw |= v40;
|
|
|
|
if ( (y & 15) >= (x & 15) )
|
|
psw |= h08;
|
|
|
|
if ( y < x * 2 )
|
|
{
|
|
a = ya / x;
|
|
y = ya - a * x;
|
|
}
|
|
else
|
|
{
|
|
a = 255 - (ya - x * 0x200) / (256 - x);
|
|
y = x + (ya - x * 0x200) % (256 - x);
|
|
}
|
|
|
|
nz = (uint8_t) a;
|
|
a = (uint8_t) a;
|
|
|
|
goto loop;
|
|
}
|
|
|
|
// 11. DECIMAL COMPENSATION COMMANDS
|
|
|
|
case 0xDF: // DAA
|
|
SUSPICIOUS_OPCODE( "DAA" );
|
|
if ( a > 0x99 || c & 0x100 )
|
|
{
|
|
a += 0x60;
|
|
c = 0x100;
|
|
}
|
|
|
|
if ( (a & 0x0F) > 9 || psw & h08 )
|
|
a += 0x06;
|
|
|
|
nz = a;
|
|
a = (uint8_t) a;
|
|
goto loop;
|
|
|
|
case 0xBE: // DAS
|
|
SUSPICIOUS_OPCODE( "DAS" );
|
|
if ( a > 0x99 || !(c & 0x100) )
|
|
{
|
|
a -= 0x60;
|
|
c = 0;
|
|
}
|
|
|
|
if ( (a & 0x0F) > 9 || !(psw & h08) )
|
|
a -= 0x06;
|
|
|
|
nz = a;
|
|
a = (uint8_t) a;
|
|
goto loop;
|
|
|
|
// 12. BRANCHING COMMANDS
|
|
|
|
case 0x2F: // BRA rel
|
|
pc += (BOOST::int8_t) data;
|
|
goto inc_pc_loop;
|
|
|
|
case 0x30: // BMI
|
|
BRANCH( (nz & nz_neg_mask) )
|
|
|
|
case 0x10: // BPL
|
|
BRANCH( !(nz & nz_neg_mask) )
|
|
|
|
case 0xB0: // BCS
|
|
BRANCH( c & 0x100 )
|
|
|
|
case 0x90: // BCC
|
|
BRANCH( !(c & 0x100) )
|
|
|
|
case 0x70: // BVS
|
|
BRANCH( psw & v40 )
|
|
|
|
case 0x50: // BVC
|
|
BRANCH( !(psw & v40) )
|
|
|
|
#define CBRANCH( cond )\
|
|
{\
|
|
pc++;\
|
|
if ( cond )\
|
|
goto cbranch_taken_loop;\
|
|
rel_time -= 2;\
|
|
goto inc_pc_loop;\
|
|
}
|
|
|
|
case 0x03: // BBS dp.bit,rel
|
|
case 0x23:
|
|
case 0x43:
|
|
case 0x63:
|
|
case 0x83:
|
|
case 0xA3:
|
|
case 0xC3:
|
|
case 0xE3:
|
|
CBRANCH( READ_DP( -4, data ) >> (opcode >> 5) & 1 )
|
|
|
|
case 0x13: // BBC dp.bit,rel
|
|
case 0x33:
|
|
case 0x53:
|
|
case 0x73:
|
|
case 0x93:
|
|
case 0xB3:
|
|
case 0xD3:
|
|
case 0xF3:
|
|
CBRANCH( !(READ_DP( -4, data ) >> (opcode >> 5) & 1) )
|
|
|
|
case 0xDE: // CBNE dp+X,rel
|
|
data = (uint8_t) (data + x);
|
|
// fall through
|
|
case 0x2E:{// CBNE dp,rel
|
|
int temp;
|
|
// 61% from timer
|
|
READ_DP_TIMER( -4, data, temp );
|
|
CBRANCH( temp != a )
|
|
}
|
|
|
|
case 0x6E: { // DBNZ dp,rel
|
|
unsigned temp = READ_DP( -4, data ) - 1;
|
|
WRITE_DP( -3, (uint8_t) data, /*(uint8_t)*/ temp + no_read_before_write );
|
|
CBRANCH( temp )
|
|
}
|
|
|
|
case 0xFE: // DBNZ Y,rel
|
|
y = (uint8_t) (y - 1);
|
|
BRANCH( y )
|
|
|
|
case 0x1F: // JMP [abs+X]
|
|
SET_PC( READ_PC16( pc ) + x );
|
|
// fall through
|
|
case 0x5F: // JMP abs
|
|
SET_PC( READ_PC16( pc ) );
|
|
goto loop;
|
|
|
|
// 13. SUB-ROUTINE CALL RETURN COMMANDS
|
|
|
|
case 0x0F:{// BRK
|
|
int temp;
|
|
int ret_addr = GET_PC();
|
|
SUSPICIOUS_OPCODE( "BRK" );
|
|
SET_PC( READ_PROG16( 0xFFDE ) ); // vector address verified
|
|
PUSH16( ret_addr );
|
|
GET_PSW( temp );
|
|
psw = (psw | b10) & ~i04;
|
|
PUSH( temp );
|
|
goto loop;
|
|
}
|
|
|
|
case 0x4F:{// PCALL offset
|
|
int ret_addr = GET_PC() + 1;
|
|
SET_PC( 0xFF00 | data );
|
|
PUSH16( ret_addr );
|
|
goto loop;
|
|
}
|
|
|
|
case 0x01: // TCALL n
|
|
case 0x11:
|
|
case 0x21:
|
|
case 0x31:
|
|
case 0x41:
|
|
case 0x51:
|
|
case 0x61:
|
|
case 0x71:
|
|
case 0x81:
|
|
case 0x91:
|
|
case 0xA1:
|
|
case 0xB1:
|
|
case 0xC1:
|
|
case 0xD1:
|
|
case 0xE1:
|
|
case 0xF1: {
|
|
int ret_addr = GET_PC();
|
|
SET_PC( READ_PROG16( 0xFFDE - (opcode >> 3) ) );
|
|
PUSH16( ret_addr );
|
|
goto loop;
|
|
}
|
|
|
|
// 14. STACK OPERATION COMMANDS
|
|
|
|
{
|
|
int temp;
|
|
case 0x7F: // RET1
|
|
temp = *sp;
|
|
SET_PC( GET_LE16( sp + 1 ) );
|
|
sp += 3;
|
|
goto set_psw;
|
|
case 0x8E: // POP PSW
|
|
POP( temp );
|
|
set_psw:
|
|
SET_PSW( temp );
|
|
goto loop;
|
|
}
|
|
|
|
case 0x0D: { // PUSH PSW
|
|
int temp;
|
|
GET_PSW( temp );
|
|
PUSH( temp );
|
|
goto loop;
|
|
}
|
|
|
|
case 0x2D: // PUSH A
|
|
PUSH( a );
|
|
goto loop;
|
|
|
|
case 0x4D: // PUSH X
|
|
PUSH( x );
|
|
goto loop;
|
|
|
|
case 0x6D: // PUSH Y
|
|
PUSH( y );
|
|
goto loop;
|
|
|
|
case 0xAE: // POP A
|
|
POP( a );
|
|
goto loop;
|
|
|
|
case 0xCE: // POP X
|
|
POP( x );
|
|
goto loop;
|
|
|
|
case 0xEE: // POP Y
|
|
POP( y );
|
|
goto loop;
|
|
|
|
// 15. BIT OPERATION COMMANDS
|
|
|
|
case 0x02: // SET1
|
|
case 0x22:
|
|
case 0x42:
|
|
case 0x62:
|
|
case 0x82:
|
|
case 0xA2:
|
|
case 0xC2:
|
|
case 0xE2:
|
|
case 0x12: // CLR1
|
|
case 0x32:
|
|
case 0x52:
|
|
case 0x72:
|
|
case 0x92:
|
|
case 0xB2:
|
|
case 0xD2:
|
|
case 0xF2: {
|
|
int bit = 1 << (opcode >> 5);
|
|
int mask = ~bit;
|
|
if ( opcode & 0x10 )
|
|
bit = 0;
|
|
data += dp;
|
|
WRITE( 0, data, (READ( -1, data ) & mask) | bit );
|
|
goto inc_pc_loop;
|
|
}
|
|
|
|
case 0x0E: // TSET1 abs
|
|
case 0x4E: // TCLR1 abs
|
|
data = READ_PC16( pc );
|
|
pc += 2;
|
|
{
|
|
unsigned temp = READ( -2, data );
|
|
nz = (uint8_t) (a - temp);
|
|
temp &= ~a;
|
|
if ( opcode == 0x0E )
|
|
temp |= a;
|
|
WRITE( 0, data, temp );
|
|
}
|
|
goto loop;
|
|
|
|
case 0x4A: // AND1 C,mem.bit
|
|
c &= MEM_BIT( 0 );
|
|
pc += 2;
|
|
goto loop;
|
|
|
|
case 0x6A: // AND1 C,/mem.bit
|
|
c &= ~MEM_BIT( 0 );
|
|
pc += 2;
|
|
goto loop;
|
|
|
|
case 0x0A: // OR1 C,mem.bit
|
|
c |= MEM_BIT( -1 );
|
|
pc += 2;
|
|
goto loop;
|
|
|
|
case 0x2A: // OR1 C,/mem.bit
|
|
c |= ~MEM_BIT( -1 );
|
|
pc += 2;
|
|
goto loop;
|
|
|
|
case 0x8A: // EOR1 C,mem.bit
|
|
c ^= MEM_BIT( -1 );
|
|
pc += 2;
|
|
goto loop;
|
|
|
|
case 0xEA: // NOT1 mem.bit
|
|
data = READ_PC16( pc );
|
|
pc += 2;
|
|
{
|
|
unsigned temp = READ( -1, data & 0x1FFF );
|
|
temp ^= 1 << (data >> 13);
|
|
WRITE( 0, data & 0x1FFF, temp );
|
|
}
|
|
goto loop;
|
|
|
|
case 0xCA: // MOV1 mem.bit,C
|
|
data = READ_PC16( pc );
|
|
pc += 2;
|
|
{
|
|
unsigned temp = READ( -2, data & 0x1FFF );
|
|
unsigned bit = data >> 13;
|
|
temp = (temp & ~(1 << bit)) | ((c >> 8 & 1) << bit);
|
|
WRITE( 0, data & 0x1FFF, temp + no_read_before_write );
|
|
}
|
|
goto loop;
|
|
|
|
case 0xAA: // MOV1 C,mem.bit
|
|
c = MEM_BIT( 0 );
|
|
pc += 2;
|
|
goto loop;
|
|
|
|
// 16. PROGRAM PSW FLAG OPERATION COMMANDS
|
|
|
|
case 0x60: // CLRC
|
|
c = 0;
|
|
goto loop;
|
|
|
|
case 0x80: // SETC
|
|
c = ~0;
|
|
goto loop;
|
|
|
|
case 0xED: // NOTC
|
|
c ^= 0x100;
|
|
goto loop;
|
|
|
|
case 0xE0: // CLRV
|
|
psw &= ~(v40 | h08);
|
|
goto loop;
|
|
|
|
case 0x20: // CLRP
|
|
dp = 0;
|
|
goto loop;
|
|
|
|
case 0x40: // SETP
|
|
dp = 0x100;
|
|
goto loop;
|
|
|
|
case 0xA0: // EI
|
|
SUSPICIOUS_OPCODE( "EI" );
|
|
psw |= i04;
|
|
goto loop;
|
|
|
|
case 0xC0: // DI
|
|
SUSPICIOUS_OPCODE( "DI" );
|
|
psw &= ~i04;
|
|
goto loop;
|
|
|
|
// 17. OTHER COMMANDS
|
|
|
|
case 0x00: // NOP
|
|
goto loop;
|
|
|
|
case 0xFF:{// STOP
|
|
// handle PC wrap-around
|
|
unsigned addr = GET_PC() - 1;
|
|
if ( addr >= 0x10000 )
|
|
{
|
|
addr &= 0xFFFF;
|
|
SET_PC( addr );
|
|
dprintf( "SPC: PC wrapped around\n" );
|
|
goto loop;
|
|
}
|
|
}
|
|
// fall through
|
|
case 0xEF: // SLEEP
|
|
SUSPICIOUS_OPCODE( "STOP/SLEEP" );
|
|
--pc;
|
|
rel_time = 0;
|
|
m.cpu_error = "SPC emulation error";
|
|
goto stop;
|
|
} // switch
|
|
|
|
assert( 0 ); // catch any unhandled instructions
|
|
}
|
|
out_of_time:
|
|
rel_time -= m.cycle_table [*pc]; // undo partial execution of opcode
|
|
stop:
|
|
|
|
// Uncache registers
|
|
if ( GET_PC() >= 0x10000 )
|
|
dprintf( "SPC: PC wrapped around\n" );
|
|
m.cpu_regs.pc = (uint16_t) GET_PC();
|
|
m.cpu_regs.sp = ( uint8_t) GET_SP();
|
|
m.cpu_regs.a = ( uint8_t) a;
|
|
m.cpu_regs.x = ( uint8_t) x;
|
|
m.cpu_regs.y = ( uint8_t) y;
|
|
{
|
|
int temp;
|
|
GET_PSW( temp );
|
|
m.cpu_regs.psw = (uint8_t) temp;
|
|
}
|
|
}
|
|
SPC_CPU_RUN_FUNC_END
|