Mercurial > repos > blastem
annotate runtime.S @ 54:3b79cbcf6846
Get Flavio's color bar demo kind of sort of working
author | Mike Pavone <pavone@retrodev.com> |
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date | Tue, 18 Dec 2012 02:16:42 -0800 |
parents | 44e661913a51 |
children | bc3bc7a60c4e |
rev | line source |
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Add asssembly runtime code stub
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1 |
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2 .global handle_cycle_limit |
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3 handle_cycle_limit: |
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4 call m68k_save_context |
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5 mov %rsi, %rdi |
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6 call sync_components |
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7 mov %rax, %rsi |
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8 call m68k_load_context |
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9 ret |
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10 |
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11 do_vdp_port_write: |
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12 call m68k_save_context |
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13 mov %rcx, %rdx |
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14 call vdp_port_write |
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15 mov %rax, %rsi |
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16 call m68k_load_context |
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17 ret |
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18 |
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19 do_vdp_port_read: |
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20 call m68k_save_context |
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21 call vdp_port_read |
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22 mov %rax, %rsi |
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23 call m68k_load_context |
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24 mov 120(%rsi), %cx |
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25 ret |
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26 |
54
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27 bad_access_msg: |
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28 .asciz "Program tried to access illegal 68K address %X\n" |
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29 |
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30 .global m68k_write_word |
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31 .global vdp_psg_w |
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32 m68k_write_word: |
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33 and $0xFFFFFF, %rdi |
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34 cmp $0x400000, %edi |
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35 jle cart_w |
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36 cmp $0xE00000, %edi |
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37 jge workram_w |
54
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38 cmp $0xC00000, %edi |
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39 jge vdp_psg_w |
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40 jmp inccycles |
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41 workram_w: |
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42 and $0xFFFF, %rdi |
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43 mov %cx, (%r9, %rdi) |
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44 jmp inccycles |
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45 cart_w: |
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46 mov %cx, (%r8, %rdi) |
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47 jmp inccycles |
54
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48 vdp_psg_w: |
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49 test $0x2700E0, %edi |
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50 jnz crash |
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51 and $0x1F, %edi |
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52 cmp $4, %edi |
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53 jl try_fifo_write |
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54 jmp do_vdp_port_write |
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55 try_fifo_write: |
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56 push %rdx |
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57 push %rbx |
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58 /* fetch VDP context pointer from 68K context */ |
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59 mov 112(%rsi), %rdx |
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60 /* get fifo_cur and compare it to fifo_end */ |
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61 mov (%rdx), %rbx |
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62 cmp %rbx, 8(%rdx) |
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63 /* bail out if fifo is full */ |
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64 je fifo_fallback |
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65 /* populate FIFO entry */ |
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66 mov %cx, 4(%rbx) /* value */ |
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67 movb $0, 6(%rbx) /* partial */ |
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68 mov %eax, %ecx |
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69 shl $3, %ecx /* multiply by 68K cycle by 7 to get MCLK cycle */ |
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70 sub %eax, %ecx |
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71 mov %ecx, (%rbx) /* cycle */ |
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72 /* update fifo_cur and store back in 68K context */ |
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73 add $8, %rbx |
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74 mov %rbx, (%rdx) |
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75 /* clear pending flag */ |
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76 andb $0xEF, 19(%rdx) |
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77 pop %rbx |
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78 pop %rdx |
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79 jmp inccycles |
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80 fifo_fallback: |
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81 pop %rbx |
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82 pop %rdx |
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83 jmp do_vdp_port_write |
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84 crash: |
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85 mov %edi, %esi |
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86 lea bad_access_msg(%rip), %rdi |
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87 call printf |
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88 mov $1, %rdi |
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89 call exit |
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90 |
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91 .global m68k_write_byte |
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92 m68k_write_byte: |
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93 and $0xFFFFFF, %rdi |
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94 /* deal with byte swapping */ |
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95 xor $1, %edi |
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96 cmp $0x400000, %edi |
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97 jle cart_wb |
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98 cmp $0xE00000, %edi |
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99 jge workram_wb |
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100 jmp inccycles |
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101 workram_wb: |
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102 and $0xFFFF, %rdi |
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103 mov %cl, (%r9, %rdi) |
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104 jmp inccycles |
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105 cart_wb: |
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106 mov %cl, (%r8, %rdi) |
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107 jmp inccycles |
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108 |
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109 .global m68k_write_long_lowfirst |
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110 m68k_write_long_lowfirst: |
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111 push %rdi |
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112 add $2, %edi |
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113 call m68k_write_word |
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114 shr $16, %ecx |
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115 pop %rdi |
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116 jmp m68k_write_word |
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117 |
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118 .global m68k_write_long_highfirst |
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119 m68k_write_long_highfirst: |
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120 push %rdi |
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121 push %rcx |
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122 shr $16, %ecx |
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123 call m68k_write_word |
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124 pop %rcx |
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125 pop %rdi |
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126 add $2, %rdi |
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127 jmp m68k_write_word |
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128 |
18
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129 .global m68k_read_word_scratch1 |
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130 m68k_read_word_scratch1: |
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131 and $0xFFFFFF, %rcx |
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132 cmp $0x400000, %ecx |
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133 jle cart |
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134 cmp $0xE00000, %ecx |
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135 jge workram |
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136 cmp $0xC00000, %edi |
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137 jge vdp_psg |
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138 xor %cx, %cx |
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139 dec %cx |
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140 jmp inccycles |
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141 workram: |
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142 and $0xFFFF, %rcx |
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143 mov (%r9, %rcx), %cx |
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144 jmp inccycles |
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145 vdp_psg: |
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146 test $0x2700E0, %edi |
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147 jnz crash |
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148 and $0x1F, %edi |
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149 jmp do_vdp_port_read |
18
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150 cart: |
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151 mov (%r8, %rcx), %cx |
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152 inccycles: |
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153 add $4, %rax |
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154 cmp %rbp, %rax |
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155 jge handle_cycle_limit |
18
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156 ret |
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157 |
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158 .global m68k_read_long_scratch1 |
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159 m68k_read_long_scratch1: |
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160 push %rcx |
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161 call m68k_read_word_scratch1 |
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162 mov %cx, %di |
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163 pop %rcx |
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164 add $2, %ecx |
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165 call m68k_read_word_scratch1 |
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166 and $0xFFFF, %ecx |
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167 shl $16, %edi |
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168 or %edi, %ecx |
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169 ret |
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170 |
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171 .global m68k_read_byte_scratch1 |
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172 m68k_read_byte_scratch1: |
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173 and $0xFFFFFF, %rcx |
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174 /* deal with byte swapping */ |
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175 xor $1, %ecx |
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176 cmp $0x400000, %ecx |
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177 jle cart_b |
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178 cmp $0xE00000, %ecx |
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179 jge workram_b |
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180 xor %cl, %cl |
54
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181 dec %cl |
18
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182 jmp inccycles |
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183 workram_b: |
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184 and $0xFFFF, %rcx |
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185 mov (%r9, %rcx), %cl |
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186 jmp inccycles |
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187 cart_b: |
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188 mov (%r8, %rcx), %cl |
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189 jmp inccycles |
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190 |
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191 ret_addr_msg: |
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192 .asciz "Program modified return address on stack: found %X, expected %X\n" |
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193 |
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194 .global m68k_modified_ret_addr |
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195 m68k_modified_ret_addr: |
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196 lea ret_addr_msg(%rip), %rdi |
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197 mov %rcx, %rsi |
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198 mov 8(%rsp), %rdx |
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199 call printf |
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200 mov $1, %rdi |
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201 call exit |
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202 |
53
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|
203 dyn_addr_msg: |
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|
204 .asciz "Program needs dynamically calculated native address\n" |
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205 |
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|
206 .global m68k_native_addr |
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|
207 m68k_native_addr: |
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208 lea dyn_addr_msg(%rip), %rdi |
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209 call puts |
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210 mov $1, %rdi |
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211 call exit |
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|
212 |
18
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213 .global m68k_save_context |
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|
214 m68k_save_context: |
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215 mov %bl, 1(%rsi) /* N Flag */ |
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216 mov %bh, 2(%rsi) /* V flag */ |
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217 mov %dl, 3(%rsi) /* Z flag */ |
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218 mov %dh, 4(%rsi) /* C flag */ |
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219 mov %r10d, 8(%rsi) /* d0 */ |
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220 mov %r11d, 12(%rsi) /* d1 */ |
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221 mov %r12d, 16(%rsi) /* d2 */ |
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222 mov %r13d, 40(%rsi) /* a0 */ |
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223 mov %r14d, 44(%rsi) /* a1 */ |
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224 mov %r15d, 68(%rsi) /* a7 */ |
54
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|
225 mov %eax, 76(%rsi) /* current cycle count */ |
18
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226 ret |
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|
227 |
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228 .global m68k_load_context |
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229 m68k_load_context: |
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230 mov 1(%rsi), %bl /* N Flag */ |
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231 mov 2(%rsi), %bh /* V flag */ |
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232 mov 3(%rsi), %dl /* Z flag */ |
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233 mov 4(%rsi), %dh /* C flag */ |
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234 mov 8(%rsi), %r10d /* d0 */ |
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235 mov 12(%rsi), %r11d /* d1 */ |
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236 mov 16(%rsi), %r12d /* d2 */ |
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237 mov 40(%rsi), %r13d /* a0 */ |
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238 mov 44(%rsi), %r14d /* a1 */ |
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239 mov 68(%rsi), %r15d /* a7 */ |
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240 mov 72(%rsi), %ebp /* target cycle count */ |
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241 mov 76(%rsi), %eax /* current cycle count */ |
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242 mov 80(%rsi), %r8d /* cartridge address */ |
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243 mov 88(%rsi), %r9d /* work ram address */ |
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244 ret |
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245 |
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246 .global m68k_start_context |
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247 m68k_start_context: |
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248 call m68k_load_context |
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249 jmp *%rdi |