137 lines
3.1 KiB
C
137 lines
3.1 KiB
C
static int
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opAAA(uint32_t fetchdat)
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{
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flags_rebuild();
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if ((cpu_state.flags & A_FLAG) || ((AL & 0xF) > 9)) {
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/* On 286, it's indeed AX - behavior difference from 808x. */
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AX += 6;
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AH++;
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cpu_state.flags |= (A_FLAG | C_FLAG);
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} else
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cpu_state.flags &= ~(A_FLAG | C_FLAG);
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AL &= 0xF;
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CLOCK_CYCLES(is486 ? 3 : 4);
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PREFETCH_RUN(is486 ? 3 : 4, 1, -1, 0, 0, 0, 0, 0);
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return 0;
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}
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static int
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opAAD(uint32_t fetchdat)
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{
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int base = getbytef();
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if (!cpu_isintel)
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base = 10;
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AL = (AH * base) + AL;
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AH = 0;
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setznp16(AX);
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CLOCK_CYCLES((is486) ? 14 : 19);
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PREFETCH_RUN(is486 ? 14 : 19, 2, -1, 0, 0, 0, 0, 0);
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return 0;
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}
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static int
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opAAM(uint32_t fetchdat)
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{
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int base = getbytef();
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if (!base || !cpu_isintel)
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base = 10;
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AH = AL / base;
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AL %= base;
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setznp16(AX);
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CLOCK_CYCLES((is486) ? 15 : 17);
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PREFETCH_RUN(is486 ? 15 : 17, 2, -1, 0, 0, 0, 0, 0);
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return 0;
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}
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static int
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opAAS(uint32_t fetchdat)
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{
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flags_rebuild();
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if ((cpu_state.flags & A_FLAG) || ((AL & 0xF) > 9)) {
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/* On 286, it's indeed AX - behavior difference from 808x. */
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AX -= 6;
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AH--;
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cpu_state.flags |= (A_FLAG | C_FLAG);
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} else
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cpu_state.flags &= ~(A_FLAG | C_FLAG);
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AL &= 0xF;
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CLOCK_CYCLES(is486 ? 3 : 4);
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PREFETCH_RUN(is486 ? 3 : 4, 1, -1, 0, 0, 0, 0, 0);
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return 0;
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}
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static int
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opDAA(uint32_t fetchdat)
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{
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uint16_t tempw;
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uint16_t old_AL;
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uint16_t old_CF;
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flags_rebuild();
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old_AL = AL;
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old_CF = cpu_state.flags & C_FLAG;
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cpu_state.flags &= ~C_FLAG;
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if (((AL & 0xf) > 9) || (cpu_state.flags & A_FLAG)) {
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int tempi = ((uint16_t) AL) + 6;
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AL += 6;
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if (old_CF || (tempi & 0x100))
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cpu_state.flags |= C_FLAG;
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cpu_state.flags |= A_FLAG;
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} else
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cpu_state.flags &= ~A_FLAG;
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if ((old_AL > 0x99) || old_CF) {
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AL += 0x60;
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cpu_state.flags |= C_FLAG;
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} else
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cpu_state.flags &= ~C_FLAG;
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tempw = cpu_state.flags & (C_FLAG | A_FLAG);
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setznp8(AL);
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flags_rebuild();
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cpu_state.flags = (cpu_state.flags & ~(C_FLAG | A_FLAG)) | tempw;
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CLOCK_CYCLES(4);
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PREFETCH_RUN(4, 1, -1, 0, 0, 0, 0, 0);
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return 0;
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}
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static int
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opDAS(uint32_t fetchdat)
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{
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uint16_t tempw;
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uint16_t old_AL;
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uint16_t old_CF;
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flags_rebuild();
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old_AL = AL;
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old_CF = cpu_state.flags & C_FLAG;
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cpu_state.flags &= ~C_FLAG;
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if (((AL & 0xf) > 9) || (cpu_state.flags & A_FLAG)) {
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int tempi = ((uint16_t) AL) - 6;
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AL -= 6;
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if (old_CF || (tempi & 0x100))
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cpu_state.flags |= C_FLAG;
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cpu_state.flags |= A_FLAG;
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} else
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cpu_state.flags &= ~A_FLAG;
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if ((old_AL > 0x99) || old_CF) {
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AL -= 0x60;
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cpu_state.flags |= C_FLAG;
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}
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tempw = cpu_state.flags & (C_FLAG | A_FLAG);
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setznp8(AL);
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flags_rebuild();
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cpu_state.flags = (cpu_state.flags & ~(C_FLAG | A_FLAG)) | tempw;
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CLOCK_CYCLES(4);
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PREFETCH_RUN(4, 1, -1, 0, 0, 0, 0, 0);
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return 0;
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}
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