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Implement NEG and some bugfixes.

master
Ben Kurtovic pirms 8 gadiem
vecāks
revīzija
56580d7392
3 mainītis faili ar 33 papildinājumiem un 9 dzēšanām
  1. +11
    -0
      src/z80_flags.inc.c
  2. +14
    -1
      src/z80_ops.inc.c
  3. +8
    -8
      src/z80_tables.inc.c

+ 11
- 0
src/z80_flags.inc.c Parādīt failu

@@ -146,6 +146,17 @@ static inline void set_flags_bitshift(Z80 *z80, uint8_t res, uint8_t bit)
SIGN(res), 0xFF);
}

/*
Set the flags for a NEG instruction.
*/
static inline void set_flags_neg(Z80 *z80)
{
uint8_t val = z80->regs.a;
uint8_t res = -val;
set_flags(z80, CARRY(0, -, val), SUB, OV_SUB(0, val, res), F3(res),
HALF(0, -, val), F5(res), ZERO(res), SIGN(res), 0xFF);
}

#undef POS
#undef NEG
#undef CARRY


+ 14
- 1
src/z80_ops.inc.c Parādīt failu

@@ -335,6 +335,7 @@ static uint8_t z80_inst_ld_sp_hl(Z80 *z80, uint8_t opcode)
{
(void) opcode;
z80->regs.sp = z80->regs.hl;
z80->regs.pc++;
return 6;
}

@@ -346,6 +347,7 @@ static uint8_t z80_inst_ld_sp_ixy(Z80 *z80, uint8_t opcode)
{
(void) opcode;
*z80->regs.ixy = z80->regs.hl;
z80->regs.pc++;
return 10;
}

@@ -1119,7 +1121,18 @@ static uint8_t z80_inst_dec_ixy(Z80 *z80, uint8_t opcode)

// TODO: CPL

// TODO: NEG
/*
NEG (0xED44, 0xED4C, 0xED54, 0xED5C, 0xED64, 0xED6C, 0xED74, 0xED7C):
Negate A.
*/
static uint8_t z80_inst_neg(Z80 *z80, uint8_t opcode)
{
(void) opcode;
set_flags_neg(z80);
z80->regs.a = -z80->regs.a;
z80->regs.pc++;
return 8;
}

// TODO: CCF



+ 8
- 8
src/z80_tables.inc.c Parādīt failu

@@ -329,7 +329,7 @@ static DispatchTable instruction_table_extended = {
[0x41] = z80_inst_out_c_r,
[0x42] = z80_inst_sbc_hl_ss,
[0x43] = z80_inst_ld_inn_dd,
[0x44] = z80_inst_unimplemented, // TODO
[0x44] = z80_inst_neg,
[0x45] = z80_inst_retn,
[0x46] = z80_inst_im,
[0x47] = z80_inst_ld_i_a,
@@ -337,7 +337,7 @@ static DispatchTable instruction_table_extended = {
[0x49] = z80_inst_out_c_r,
[0x4A] = z80_inst_adc_hl_ss,
[0x4B] = z80_inst_ld_dd_inn,
[0x4C] = z80_inst_unimplemented, // TODO
[0x4C] = z80_inst_neg,
[0x4D] = z80_inst_reti,
[0x4E] = z80_inst_im,
[0x4F] = z80_inst_ld_r_a,
@@ -345,7 +345,7 @@ static DispatchTable instruction_table_extended = {
[0x51] = z80_inst_out_c_r,
[0x52] = z80_inst_sbc_hl_ss,
[0x53] = z80_inst_ld_inn_dd,
[0x54] = z80_inst_unimplemented, // TODO
[0x54] = z80_inst_neg,
[0x55] = z80_inst_retn,
[0x56] = z80_inst_im,
[0x57] = z80_inst_unimplemented, // TODO
@@ -353,7 +353,7 @@ static DispatchTable instruction_table_extended = {
[0x59] = z80_inst_out_c_r,
[0x5A] = z80_inst_adc_hl_ss,
[0x5B] = z80_inst_ld_dd_inn,
[0x5C] = z80_inst_unimplemented, // TODO
[0x5C] = z80_inst_neg,
[0x5D] = z80_inst_retn,
[0x5E] = z80_inst_im,
[0x5F] = z80_inst_unimplemented, // TODO
@@ -361,7 +361,7 @@ static DispatchTable instruction_table_extended = {
[0x61] = z80_inst_out_c_r,
[0x62] = z80_inst_sbc_hl_ss,
[0x63] = z80_inst_ld_inn_dd,
[0x64] = z80_inst_unimplemented, // TODO
[0x64] = z80_inst_neg,
[0x65] = z80_inst_retn,
[0x66] = z80_inst_im,
[0x67] = z80_inst_unimplemented, // TODO
@@ -369,7 +369,7 @@ static DispatchTable instruction_table_extended = {
[0x69] = z80_inst_out_c_r,
[0x6A] = z80_inst_adc_hl_ss,
[0x6B] = z80_inst_ld_dd_inn,
[0x6C] = z80_inst_unimplemented, // TODO
[0x6C] = z80_inst_neg,
[0x6D] = z80_inst_retn,
[0x6E] = z80_inst_im,
[0x6F] = z80_inst_unimplemented, // TODO
@@ -377,7 +377,7 @@ static DispatchTable instruction_table_extended = {
[0x71] = z80_inst_out_c_r,
[0x72] = z80_inst_sbc_hl_ss,
[0x73] = z80_inst_ld_inn_dd,
[0x74] = z80_inst_unimplemented, // TODO
[0x74] = z80_inst_neg,
[0x75] = z80_inst_retn,
[0x76] = z80_inst_im,
[0x77] = z80_inst_nop2,
@@ -385,7 +385,7 @@ static DispatchTable instruction_table_extended = {
[0x79] = z80_inst_out_c_r,
[0x7A] = z80_inst_adc_hl_ss,
[0x7B] = z80_inst_ld_dd_inn,
[0x7C] = z80_inst_unimplemented, // TODO
[0x7C] = z80_inst_neg,
[0x7D] = z80_inst_retn,
[0x7E] = z80_inst_im,
[0x7F] = z80_inst_nop2,


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