mirror of
https://github.com/sarah-walker-pcem/pcem.git
synced 2025-07-23 03:33:02 +02:00
108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
#ifndef _X86_OPS_BCD_H_
|
|
#define _X86_OPS_BCD_H_
|
|
static int opAAA(uint32_t fetchdat) {
|
|
flags_rebuild();
|
|
if ((cpu_state.flags & A_FLAG) || ((AL & 0xF) > 9)) {
|
|
AL += 6;
|
|
AH++;
|
|
cpu_state.flags |= (A_FLAG | C_FLAG);
|
|
} else
|
|
cpu_state.flags &= ~(A_FLAG | C_FLAG);
|
|
AL &= 0xF;
|
|
CLOCK_CYCLES(is486 ? 3 : 4);
|
|
PREFETCH_RUN(is486 ? 3 : 4, 1, -1, 0, 0, 0, 0, 0);
|
|
return 0;
|
|
}
|
|
|
|
static int opAAD(uint32_t fetchdat) {
|
|
int base = getbytef();
|
|
if (cpu_manufacturer != MANU_INTEL)
|
|
base = 10;
|
|
AL = (AH * base) + AL;
|
|
AH = 0;
|
|
setznp16(AX);
|
|
CLOCK_CYCLES((is486) ? 14 : 19);
|
|
PREFETCH_RUN(is486 ? 14 : 19, 2, -1, 0, 0, 0, 0, 0);
|
|
return 0;
|
|
}
|
|
|
|
static int opAAM(uint32_t fetchdat) {
|
|
int base = getbytef();
|
|
if (!base || cpu_manufacturer != MANU_INTEL)
|
|
base = 10;
|
|
AH = AL / base;
|
|
AL %= base;
|
|
setznp16(AX);
|
|
CLOCK_CYCLES((is486) ? 15 : 17);
|
|
PREFETCH_RUN(is486 ? 15 : 17, 2, -1, 0, 0, 0, 0, 0);
|
|
return 0;
|
|
}
|
|
|
|
static int opAAS(uint32_t fetchdat) {
|
|
flags_rebuild();
|
|
if ((cpu_state.flags & A_FLAG) || ((AL & 0xF) > 9)) {
|
|
AL -= 6;
|
|
AH--;
|
|
cpu_state.flags |= (A_FLAG | C_FLAG);
|
|
} else
|
|
cpu_state.flags &= ~(A_FLAG | C_FLAG);
|
|
AL &= 0xF;
|
|
CLOCK_CYCLES(is486 ? 3 : 4);
|
|
PREFETCH_RUN(is486 ? 3 : 4, 1, -1, 0, 0, 0, 0, 0);
|
|
return 0;
|
|
}
|
|
|
|
static int opDAA(uint32_t fetchdat) {
|
|
uint16_t tempw;
|
|
|
|
flags_rebuild();
|
|
if ((cpu_state.flags & A_FLAG) || ((AL & 0xf) > 9)) {
|
|
int tempi = ((uint16_t)AL) + 6;
|
|
AL += 6;
|
|
cpu_state.flags |= A_FLAG;
|
|
if (tempi & 0x100)
|
|
cpu_state.flags |= C_FLAG;
|
|
}
|
|
if ((cpu_state.flags & C_FLAG) || (AL > 0x9f)) {
|
|
AL += 0x60;
|
|
cpu_state.flags |= C_FLAG;
|
|
}
|
|
|
|
tempw = cpu_state.flags & (C_FLAG | A_FLAG);
|
|
setznp8(AL);
|
|
flags_rebuild();
|
|
cpu_state.flags |= tempw;
|
|
CLOCK_CYCLES(4);
|
|
PREFETCH_RUN(4, 1, -1, 0, 0, 0, 0, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int opDAS(uint32_t fetchdat) {
|
|
uint16_t tempw;
|
|
|
|
flags_rebuild();
|
|
if ((cpu_state.flags & A_FLAG) || ((AL & 0xf) > 9)) {
|
|
int tempi = ((uint16_t)AL) - 6;
|
|
AL -= 6;
|
|
cpu_state.flags |= A_FLAG;
|
|
if (tempi & 0x100)
|
|
cpu_state.flags |= C_FLAG;
|
|
}
|
|
if ((cpu_state.flags & C_FLAG) || (AL > 0x9f)) {
|
|
AL -= 0x60;
|
|
cpu_state.flags |= C_FLAG;
|
|
}
|
|
|
|
tempw = cpu_state.flags & (C_FLAG | A_FLAG);
|
|
setznp8(AL);
|
|
flags_rebuild();
|
|
cpu_state.flags |= tempw;
|
|
CLOCK_CYCLES(4);
|
|
PREFETCH_RUN(4, 1, -1, 0, 0, 0, 0, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* _X86_OPS_BCD_H_ */
|