Mercurial > repos > blastem
diff z80_to_x86.c @ 287:fb840e0a48cd
Implement RRD and implement flags on RLD
| author | Mike Pavone <pavone@retrodev.com> |
|---|---|
| date | Sun, 05 May 2013 11:17:37 -0700 |
| parents | 872a8911e0f4 |
| children | b970ea214ecb |
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--- a/z80_to_x86.c Sat May 04 18:51:53 2013 -0700 +++ b/z80_to_x86.c Sun May 05 11:17:37 2013 -0700 @@ -1099,11 +1099,47 @@ dst = ror_ir(dst, 8, SCRATCH1, SZ_W); dst = zcycles(dst, 4); dst = or_rr(dst, SCRATCH1, opts->regs[Z80_A], SZ_B); + //set flags + //TODO: Implement half-carry flag + dst = mov_irdisp8(dst, 0, CONTEXT, zf_off(ZF_N), SZ_B); + dst = setcc_rdisp8(dst, CC_P, CONTEXT, zf_off(ZF_PV)); + dst = setcc_rdisp8(dst, CC_Z, CONTEXT, zf_off(ZF_Z)); + dst = setcc_rdisp8(dst, CC_S, CONTEXT, zf_off(ZF_S)); + dst = mov_rr(dst, opts->regs[Z80_HL], SCRATCH2, SZ_W); dst = ror_ir(dst, 8, SCRATCH1, SZ_W); dst = call(dst, (uint8_t *)z80_write_byte); break; - //case Z80_RRD:*/ + case Z80_RRD: + dst = zcycles(dst, 8); + dst = mov_rr(dst, opts->regs[Z80_HL], SCRATCH1, SZ_W); + dst = call(dst, (uint8_t *)z80_read_byte); + //Before: (HL) = 0x12, A = 0x34 + //After: (HL) = 0x41, A = 0x32 + dst = movzx_rr(dst, opts->regs[Z80_A], SCRATCH2, SZ_B, SZ_W); + dst = ror_ir(dst, 4, SCRATCH1, SZ_W); + dst = shl_ir(dst, 4, SCRATCH2, SZ_W); + dst = and_ir(dst, 0xF00F, SCRATCH1, SZ_W); + dst = and_ir(dst, 0xF0, opts->regs[Z80_A], SZ_B); + //SCRATCH1 = 0x2001 + //SCRATCH2 = 0x0040 + dst = or_rr(dst, SCRATCH2, SCRATCH1, SZ_W); + //SCRATCH1 = 0x2041 + dst = ror_ir(dst, 8, SCRATCH1, SZ_W); + dst = zcycles(dst, 4); + dst = shr_ir(dst, 4, SCRATCH1, SZ_B); + dst = or_rr(dst, SCRATCH1, opts->regs[Z80_A], SZ_B); + //set flags + //TODO: Implement half-carry flag + dst = mov_irdisp8(dst, 0, CONTEXT, zf_off(ZF_N), SZ_B); + dst = setcc_rdisp8(dst, CC_P, CONTEXT, zf_off(ZF_PV)); + dst = setcc_rdisp8(dst, CC_Z, CONTEXT, zf_off(ZF_Z)); + dst = setcc_rdisp8(dst, CC_S, CONTEXT, zf_off(ZF_S)); + + dst = mov_rr(dst, opts->regs[Z80_HL], SCRATCH2, SZ_W); + dst = ror_ir(dst, 8, SCRATCH1, SZ_W); + dst = call(dst, (uint8_t *)z80_write_byte); + break; case Z80_BIT: cycles = (inst->addr_mode == Z80_IX_DISPLACE || inst->addr_mode == Z80_IY_DISPLACE) ? 8 : 16; dst = zcycles(dst, cycles);