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NEC SET1 instructions (#7)

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Mask the bit argument properly
This commit is contained in:
Cacodemon345
2022-09-05 01:50:38 +06:00
committed by GitHub
parent db6eac6e2f
commit 2280685526
1 changed files with 21 additions and 2 deletions
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23
src/cpu/808x.c
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@@ -1758,7 +1758,7 @@ execx86(int cycs)
wait(3, 0);
{
uint8_t bit = (opcode & 0x8) ? (pfq_fetchb()) : (CL);
bit &= ((1 << bits) - 1);
bit &= ((1 << (3 + (opcode & 0x1))) - 1);
read_ea(0, bits);
set_zf_ex(!(cpu_data & (1 << bit)));
@@ -1777,7 +1777,7 @@ execx86(int cycs)
wait(3, 0);
{
uint8_t bit = (opcode & 0x8) ? (pfq_fetchb()) : (CL);
bit &= ((1 << bits) - 1);
bit &= ((1 << (3 + (opcode & 0x1))) - 1);
read_ea(0, bits);
if (bits == 8) seteab((cpu_data & 0xFF) ^ (1 << bit));
@@ -1786,6 +1786,25 @@ execx86(int cycs)
handled = 1;
break;
}
case 0x14: /* SET1 r8/m8, CL*/
case 0x15: /* SET1 r16/m16, CL*/
case 0x1c: /* SET1 r8/m8, imm3 */
case 0x1d: /* SET1 r16/m16, imm4 */
{
bits = 8 << (opcode & 0x1);
do_mod_rm();
wait(3, 0);
{
uint8_t bit = (opcode & 0x8) ? (pfq_fetchb()) : (CL);
bit &= ((1 << (3 + (opcode & 0x1))) - 1);
read_ea(0, bits);
if (bits == 8) seteab((cpu_data & 0xFF) | (1 << bit));
else seteaw((cpu_data & 0xFFFF) | (1 << bit));
}
handled = 1;
break;
}
default: {
opcode = orig_opcode;
break;