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annotate runtime_win.S @ 1374:8f404b1fa572

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Go back to resetting the refresh counter after a DMA. Probably not quite correct as it is probably reset on VDP triggered refresh, but this is close enough for now given the general limitations with my refresh code. VDP FIFO Testing seems to be passing 100% reliably again (was occassionally failing still with the last commit)
author Michael Pavone <pavone@retrodev.com>
date Tue, 23 May 2017 23:47:40 -0700
parents 80a67be1770b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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74