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annotate notes.txt @ 505:b7b7a1cab44a

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The local clone on my laptop got messed up and some changes had not been pushed. This commit represents the status of the working copy from that clone. It unfortunately contains some changes that I did not intend to commit yet, but this seems like the best option at the moment.
author Michael Pavone <pavone@retrodev.com>
date Mon, 06 Jan 2014 22:54:05 -0800
parents 0ae589d4c3f9
children
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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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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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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 = HL
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60 bx = BC
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61 cx = DE
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62 dx = IX
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63 ebp = current cycle count
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64 rsi = context pointer
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65 edi = target cycle count
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66 rsp = native stack pointer
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67 r8 = IY
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68 r9 = SP
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69 r10 = A (maybe AF?)
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70 r11 = z80 ram address
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71 r12 = cartridge address if bank is pointed at ROM
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72 r13 = scratch1
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73 r14 = scratch2
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74 r15 = ?maybe z80 bank register?
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