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ocpu: Add handling for ZF and NF flags

This commit is contained in:
g1n 2022-04-19 14:20:01 +03:00
parent 1d4eb7f26d
commit cad208e9c8
Signed by: g1n
GPG Key ID: 8D352193D65D4E2C
1 changed files with 23 additions and 0 deletions
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23
src/ocpu/ocpu.c
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@ -100,73 +100,96 @@ int match_register(byte reg) { // Function that returns register's value by taki
return 0xFF; // FIXME: add some error handling
}
void set_flags(byte reg_value) {
ocpu.ZF = (reg_value == 0);
ocpu.NF = (reg_value & 0x40) > 0;
}
void write_register(byte reg, byte value, word word_value) {
switch(reg) {
case REG_AL:
ocpu.A = (ocpu.A & 0xFF00) | (value & 0xFF);
ocpu.AL = ocpu.A & 0xFF;
set_flags(ocpu.AL);
break;
case REG_AH:
ocpu.A = ((value & 0xFF) << 8) | (ocpu.A & 0xFF);
ocpu.AH = ocpu.A >> 8;
set_flags(ocpu.AH);
break;
case REG_A:
ocpu.A = word_value;
set_flags(ocpu.A);
break;
case REG_BL:
ocpu.B = (ocpu.B & 0xFF00) | (value & 0xFF);
ocpu.BL = ocpu.B & 0xFF;
set_flags(ocpu.BL);
break;
case REG_BH:
ocpu.B = ((value & 0xFF) << 8) | (ocpu.B & 0xFF);
ocpu.BH = ocpu.B >> 8;
set_flags(ocpu.BH);
break;
case REG_B:
ocpu.B = word_value;
set_flags(ocpu.B);
break;
case REG_CL:
ocpu.C = (ocpu.C & 0xFF00) | (value & 0xFF);
ocpu.CL = ocpu.C & 0xFF;
set_flags(ocpu.CL);
break;
case REG_CH:
ocpu.C = ((value & 0xFF) << 8) | (ocpu.C & 0xFF);
ocpu.CH = ocpu.C >> 8;
set_flags(ocpu.CH);
break;
case REG_C:
ocpu.C = word_value;
set_flags(ocpu.C);
break;
case REG_DL:
ocpu.D = (ocpu.D & 0xFF00) | (value & 0xFF);
ocpu.DL = ocpu.D & 0xFF;
set_flags(ocpu.DL);
break;
case REG_DH:
ocpu.D = ((value & 0xFF) << 8) | (ocpu.D & 0xFF);
ocpu.DH = ocpu.D >> 8;
set_flags(ocpu.DH);
break;
case REG_D:
ocpu.D = word_value;
set_flags(ocpu.D);
break;
case REG_EL:
ocpu.E = (ocpu.E & 0xFF00) | (value & 0xFF);
ocpu.EL = ocpu.E & 0xFF;
set_flags(ocpu.EL);
break;
case REG_EH:
ocpu.E = ((value & 0xFF) << 8) | (ocpu.E & 0xFF);
ocpu.EH = ocpu.E >> 8;
set_flags(ocpu.EH);
break;
case REG_E:
ocpu.E = word_value;
set_flags(ocpu.E);
break;
case REG_FL:
ocpu.F = (ocpu.F & 0xFF00) | (value & 0xFF);
ocpu.FL = ocpu.F & 0xFF;
set_flags(ocpu.FL);
break;
case REG_FH:
ocpu.F = ((value & 0xFF) << 8) | (ocpu.F & 0xFF);
ocpu.FH = ocpu.F >> 8;
set_flags(ocpu.FH);
break;
case REG_F:
ocpu.F = word_value;
set_flags(ocpu.F);
break;
default:
printf("Wrong register: %02X\n", reg);