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M68K to x86 translation works for a limited subset of instructions and addressing modes
author Mike Pavone <pavone@retrodev.com>
date Tue, 04 Dec 2012 19:13:12 -0800
parents 2bdad0f52f42
children 0ae589d4c3f9
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1 cmp.w <ea>, Dn 4(1/0) + <ea> time
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2 cmp.l <ea>, Dn 6(1/0) + <ea> time
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3 cmp.w #num, Dn 4(1/0) + 4(1/0)
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4 cmp.l #num, Dn 6(1/0) + 8(2/0)
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5
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6 cmpi.w #num, Dn 8(2/0)
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7 cmpi.l #num, Dn 14(3/0)
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8
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9
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10 movem
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11
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12 subtype field (bits 9-11) = 110 or 100 depending on direction
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13 bit 8 = 0
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14 bit 7 = 1
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15 bit 6 = size
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19 x86-64 registers in 68K core
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20
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21 1. native stack pointer
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22 2. current cycle count
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23 3. target cycle count
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24 4. cartridge address
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25 5. work ram address
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26 6. scratch register
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27 7. context pointer (contains 68K registers and memory pointers not in registers)
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28 8. status register (maybe, depends on how well I can abuse native x86 status stuff)
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29 Rest of registers used for holding 68K registers
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30
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31 rax = cycle counter
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32 bl = N flag
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33 bh = V flag
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34 rcx = scratch register
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35 dl = Z flag
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36 dh = C flag
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37 rbp = target cycle count
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38 rsi = context pointer
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39 rdi = scratch register
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40 r8 = cartridge address
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41 r9 = work ram address
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42 r10 = d0
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43 r11 = d1
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44 r12 = d2
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45 r13 = a0
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46 r14 = a1
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47 r15 = a7
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48 rsp = native stack pointer
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49
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50 68K context:
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51 uint8_t flags[5];
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52 uint8_t pad??[3]
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53 uint32_t dregs[8]; //8 + 4 * reg
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54 uint32_t aregs[8]; //40 + 4 * reg
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55 .....
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56
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57 x86-64 registers in Z80 core
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58
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59 ax = AF
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60 bx = BC
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61 cx = DE
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62 dx = HL
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63
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64 1. native stack pointer
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65 2. current cycle count
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66 3. target cycle count