Mercurial > repos > blastem
annotate runtime_win.S @ 1925:039553703c20
Don't apply address and cd register changes to the 'live' registers until pending flag is cleared, but do preserve the upper address bits in the latch. Fixes regression in Overdrive 2 while preserving fix to Mona in 344 bytes
author | Michael Pavone <pavone@retrodev.com> |
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date | Mon, 13 Apr 2020 20:43:25 -0700 |
parents | 80a67be1770b |
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741
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1 |
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2 |
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3 invalid_msg: |
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4 .asciz "Invalid instruction at %X\n" |
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5 |
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6 .global _m68k_invalid |
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7 _m68k_invalid: |
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8 push %ecx |
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9 push invalid_msg |
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10 xor %eax, %eax |
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11 call _printf |
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12 push $1 |
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13 call _exit |
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14 |
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15 .global _bcd_add |
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16 _bcd_add: |
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17 xchg %eax, %edi |
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18 |
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19 mov %cl, %ch |
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20 mov %al, %ah |
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21 and $0xF, %ch |
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22 and $0xF, %ah |
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23 and $0xF0, %cl |
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24 and $0xF0, %al |
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25 add %ah, %ch |
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26 cmp $10, %ch |
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27 jb no_adjust |
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28 add $6, %ch |
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29 no_adjust: |
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30 add %ch, %al |
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31 add %al, %cl |
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32 mov $0, %ch |
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33 jc def_adjust |
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34 cmp $0xA0, %cl |
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35 jb no_adjust_h |
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36 def_adjust: |
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37 add $0x60, %cl |
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38 mov $1, %ch |
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39 no_adjust_h: |
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40 |
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41 mov %edi, %eax |
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42 ret |
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43 |
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44 .global _bcd_sub |
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45 _bcd_sub: |
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46 xchg %eax, %edi |
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47 |
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48 mov %cl, %ch |
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49 mov %al, %ah |
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50 and $0xF, %ch |
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51 and $0xF, %ah |
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52 and $0xF0, %cl |
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53 and $0xF0, %al |
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54 sub %ah, %ch |
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55 cmp $10, %ch |
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56 jb no_adjusts |
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57 sub $6, %ch |
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58 no_adjusts: |
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59 add %ch, %cl |
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60 sub %al, %cl |
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61 mov $0, %ch |
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62 jc def_adjusts |
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63 cmp $0xA0, %cl |
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64 jb no_adjust_hs |
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65 def_adjusts: |
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66 sub $0x60, %cl |
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67 mov $1, %ch |
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68 no_adjust_hs: |
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69 |
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70 mov %edi, %eax |
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71 ret |
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72 |
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73 |
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74 |