Mercurial > repos > blastem
annotate runtime.S @ 31:25016576b5f3
Make horizontal scrolling closer to correct, Comix Zone looks good, Sonic 2 slightly off
author | Mike Pavone <pavone@retrodev.com> |
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date | Sat, 08 Dec 2012 20:25:56 -0800 |
parents | 3e7bfde7606e |
children | 44e661913a51 |
rev | line source |
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17
de0085d4ea40
Add asssembly runtime code stub
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1 |
18
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2 .global handle_cycle_limit |
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3 handle_cycle_limit: |
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4 ret |
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5 |
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6 .global m68k_write_word |
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7 m68k_write_word: |
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8 and $0xFFFFFF, %rdi |
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9 cmp $0x400000, %edi |
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10 jle cart_w |
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11 cmp $0xE00000, %edi |
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12 jge workram_w |
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13 jmp inccycles |
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14 workram_w: |
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15 and $0xFFFF, %rdi |
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16 mov %cx, (%r9, %rdi) |
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17 jmp inccycles |
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18 cart_w: |
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19 mov %cx, (%r8, %rdi) |
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20 jmp inccycles |
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21 |
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22 .global m68k_write_byte |
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23 m68k_write_byte: |
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24 and $0xFFFFFF, %rdi |
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25 /* deal with byte swapping */ |
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26 xor $1, %edi |
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27 cmp $0x400000, %edi |
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28 jle cart_wb |
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29 cmp $0xE00000, %edi |
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30 jge workram_wb |
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31 jmp inccycles |
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32 workram_wb: |
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33 and $0xFFFF, %rdi |
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34 mov %cl, (%r9, %rdi) |
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35 jmp inccycles |
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36 cart_wb: |
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37 mov %cl, (%r8, %rdi) |
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38 jmp inccycles |
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39 |
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40 .global m68k_write_long_lowfirst |
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41 m68k_write_long_lowfirst: |
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42 push %rdi |
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43 add $2, %edi |
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44 call m68k_write_word |
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45 shr $16, %ecx |
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46 pop %rdi |
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47 jmp m68k_write_word |
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48 |
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49 .global m68k_write_long_highfirst |
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50 m68k_write_long_highfirst: |
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51 push %rdi |
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52 push %rcx |
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53 shr $16, %ecx |
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54 call m68k_write_word |
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55 pop %rcx |
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56 pop %rdi |
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57 add $2, %rdi |
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58 jmp m68k_write_word |
17
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59 |
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60 .global m68k_read_word_scratch1 |
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61 m68k_read_word_scratch1: |
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62 and $0xFFFFFF, %rcx |
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63 cmp $0x400000, %ecx |
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64 jle cart |
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65 cmp $0xE00000, %ecx |
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66 jge workram |
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67 xor %cx, %cx |
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68 jmp inccycles |
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69 workram: |
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70 and $0xFFFF, %rcx |
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71 mov (%r9, %rcx), %cx |
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72 jmp inccycles |
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73 cart: |
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74 mov (%r8, %rcx), %cx |
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75 inccycles: |
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76 add $4, %rax |
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77 cmp %rbp, %rax |
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78 jge sync |
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79 ret |
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80 sync: |
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81 ret |
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82 |
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83 .global m68k_read_long_scratch1 |
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84 m68k_read_long_scratch1: |
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85 push %rcx |
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86 call m68k_read_word_scratch1 |
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87 mov %cx, %di |
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88 pop %rcx |
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89 add $2, %ecx |
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90 call m68k_read_word_scratch1 |
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91 and $0xFFFF, %ecx |
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92 shl $16, %edi |
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93 or %edi, %ecx |
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94 ret |
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95 |
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96 .global m68k_read_byte_scratch1 |
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97 m68k_read_byte_scratch1: |
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98 and $0xFFFFFF, %rcx |
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99 /* deal with byte swapping */ |
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100 xor $1, %ecx |
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101 cmp $0x400000, %ecx |
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102 jle cart_b |
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103 cmp $0xE00000, %ecx |
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104 jge workram_b |
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105 xor %cl, %cl |
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106 jmp inccycles |
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107 workram_b: |
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108 and $0xFFFF, %rcx |
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109 mov (%r9, %rcx), %cl |
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110 jmp inccycles |
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111 cart_b: |
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112 mov (%r8, %rcx), %cl |
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113 jmp inccycles |
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114 |
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115 ret_addr_msg: |
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116 .asciz "Program modified return address on stack: found %X, expected %X\n" |
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117 |
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118 .global m68k_modified_ret_addr |
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119 m68k_modified_ret_addr: |
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120 lea ret_addr_msg(%rip), %rdi |
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121 mov %rcx, %rsi |
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122 mov 8(%rsp), %rdx |
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123 call printf |
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124 mov $1, %rdi |
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125 call exit |
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126 |
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127 .global m68k_save_context |
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128 m68k_save_context: |
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129 mov %bl, 1(%rsi) /* N Flag */ |
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130 mov %bh, 2(%rsi) /* V flag */ |
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131 mov %dl, 3(%rsi) /* Z flag */ |
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132 mov %dh, 4(%rsi) /* C flag */ |
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133 mov %r10d, 8(%rsi) /* d0 */ |
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134 mov %r11d, 12(%rsi) /* d1 */ |
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135 mov %r12d, 16(%rsi) /* d2 */ |
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136 mov %r13d, 40(%rsi) /* a0 */ |
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137 mov %r14d, 44(%rsi) /* a1 */ |
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138 mov %r15d, 68(%rsi) /* a7 */ |
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139 ret |
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140 |
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141 .global m68k_load_context |
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142 m68k_load_context: |
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143 mov 1(%rsi), %bl /* N Flag */ |
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144 mov 2(%rsi), %bh /* V flag */ |
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145 mov 3(%rsi), %dl /* Z flag */ |
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146 mov 4(%rsi), %dh /* C flag */ |
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147 mov 8(%rsi), %r10d /* d0 */ |
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148 mov 12(%rsi), %r11d /* d1 */ |
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149 mov 16(%rsi), %r12d /* d2 */ |
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150 mov 40(%rsi), %r13d /* a0 */ |
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151 mov 44(%rsi), %r14d /* a1 */ |
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152 mov 68(%rsi), %r15d /* a7 */ |
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153 mov 72(%rsi), %ebp /* target cycle count */ |
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154 mov 76(%rsi), %eax /* current cycle count */ |
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155 mov 80(%rsi), %r8d /* cartridge address */ |
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156 mov 88(%rsi), %r9d /* work ram address */ |
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157 ret |
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158 |
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159 .global m68k_start_context |
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160 m68k_start_context: |
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161 call m68k_load_context |
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162 jmp *%rdi |