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i86 - Implemented POP CS and MOV CS,reg instructions that are 8086 specific [Miodrag Milanovic]

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This commit is contained in:
Miodrag Milanovic 2011-05-18 12:17:17 +00:00
parent df5254338f
commit 8f7dba221c
3 changed files with 23 additions and 3 deletions
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21
src/emu/cpu/i86/instr86.c
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@ -772,7 +772,17 @@ static void PREFIX86(_push_cs)(i8086_state *cpustate) /* Opcode 0x0e */
PUSH(cpustate->sregs[CS]);
}
/* Opcode 0x0f invalid */
#ifndef I80286
static void PREFIX86(_pop_cs)(i8086_state *cpustate) /* Opcode 0x0f */
{
int ip = cpustate->pc - cpustate->base[CS];
ICOUNT -= timing.push_seg;
POP(cpustate->sregs[CS]);
cpustate->base[CS] = SegBase(CS);
cpustate->pc = (ip + cpustate->base[CS]) & AMASK;
CHANGE_PC(cpustate->pc);
}
#endif
static void PREFIX86(_adc_br8)(i8086_state *cpustate) /* Opcode 0x10 */
{
@ -2714,7 +2724,14 @@ static void PREFIX(_mov_sregw)(i8086_state *cpustate) /* Opcode 0x8e */
PREFIX(_instruction)[FETCHOP](cpustate);
break;
case 0x08: /* mov cs,ew */
break; /* doesn't do a jump far */
#ifndef I80186
int ip = cpustate->pc - cpustate->base[CS];
cpustate->sregs[CS] = src;
cpustate->base[CS] = SegBase(CS);
cpustate->pc = (ip + cpustate->base[CS]) & AMASK;
CHANGE_PC(cpustate->pc);
#endif
break;
}
#endif
}

3
src/emu/cpu/i86/instr86.h
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@ -28,6 +28,9 @@ static void PREFIX86(_or_r16w)(i8086_state *cpustate);
static void PREFIX86(_or_ald8)(i8086_state *cpustate);
static void PREFIX86(_or_axd16)(i8086_state *cpustate);
static void PREFIX86(_push_cs)(i8086_state *cpustate);
#ifndef I80286
static void PREFIX86(_pop_cs)(i8086_state *cpustate);
#endif
static void PREFIX86(_adc_br8)(i8086_state *cpustate);
static void PREFIX86(_adc_wr16)(i8086_state *cpustate);
static void PREFIX86(_adc_r8b)(i8086_state *cpustate);

2
src/emu/cpu/i86/table86.h
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@ -15,7 +15,7 @@ static void (*const PREFIX86(_instruction)[256])(i8086_state *cpustate) =
PREFIX86(_or_ald8), /* 0x0c */
PREFIX86(_or_axd16), /* 0x0d */
PREFIX86(_push_cs), /* 0x0e */
PREFIX86(_invalid),
PREFIX86(_pop_cs), /* 0x0f */
PREFIX86(_adc_br8), /* 0x10 */
PREFIX86(_adc_wr16), /* 0x11 */
PREFIX86(_adc_r8b), /* 0x12 */