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annotate runtime_win.S @ 1337:d092c15246a3

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Initial stab at horizontal border when VDP test register layer selection is in effect for H40. Extended horizontal borders in Titancade scene and ninja escape scene mostly correct now
author Michael Pavone <pavone@retrodev.com>
date Sat, 29 Apr 2017 16:51:57 -0700
parents 80a67be1770b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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74