Mercurial > repos > blastem
annotate notes.txt @ 466:bc9e0829ffc7
Fix vgmplay
author | Mike Pavone <pavone@retrodev.com> |
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date | Tue, 10 Sep 2013 21:20:54 -0700 |
parents | 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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16 |
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17 |
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18 |
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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 |
14
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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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75 |
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76 |