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annotate src/video/ataricommon/SDL_xbiosinterrupt.S @ 820:0b9b4bf3c1e7

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Important crash fix: system vectors for mouse/joystick were not restored
author Patrice Mandin <patmandin@gmail.com>
date Sat, 14 Feb 2004 10:12:27 +0000
parents 9c6613983e85
children d9f3b5bb7870
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /*
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29 * XBIOS mouse & joystick vectors
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30 *
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31 * Patrice Mandin
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32 */
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33
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34 .text
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35
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36 .globl _SDL_AtariXbios_Install
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37 .globl _SDL_AtariXbios_Restore
305
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38 .globl _SDL_AtariXbios_MouseVector
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39 .globl _SDL_AtariXbios_JoystickVector
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40
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41 .globl _SDL_AtariXbios_mouseb
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42 .globl _SDL_AtariXbios_mousex
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43 .globl _SDL_AtariXbios_mousey
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44 .globl _SDL_AtariXbios_joystick
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45
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46 /*--- Vector installer ---*/
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47
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48 _SDL_AtariXbios_Install:
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49 movel sp@(4),a0
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50
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51 /* Stop interrupts */
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52
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53 movew #0x2700,sr
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54
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55 /* Save old mouse vector, set our routine */
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56
820
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57 clrl oldmousevector
305
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58 movel sp@(8),d0
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59 beqs no_new_mouse_vector
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60 movel a0@(16),oldmousevector
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61 movel d0,a0@(16)
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62 no_new_mouse_vector:
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63
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64 /* Save old joystick vector, set our routine */
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65
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66 clrl oldjoystickvector
305
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67 movel sp@(12),d0
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68 beqs no_new_joystick_vector
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69 movel a0@(24),oldjoystickvector
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70 movel d0,a0@(24)
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71 no_new_joystick_vector:
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72
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73 /* Restart interrupts */
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74
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75 movew #0x2300,sr
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76
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77 rts
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78
820
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79 /*--- Vector restorer ---*/
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80
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81 _SDL_AtariXbios_Restore:
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82 movel sp@(4),a0
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83
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84 /* Stop interrupts */
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85
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86 movew #0x2700,sr
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87
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88 /* Restore mouse vector */
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89
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90 movel oldmousevector,d0
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91 beqs no_restore_mouse
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92 movel d0,a0@(16)
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93 no_restore_mouse:
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94
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95 /* Restore joystick vector */
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96
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97 movel oldjoystickvector,d0
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98 beqs no_restore_joystick
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99 movel d0,a0@(24)
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100 no_restore_joystick:
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101
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102 /* Restart interrupts */
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103
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104 movew #0x2300,sr
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105
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106 rts
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107
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108 /*--- Our mouse vector ---*/
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109
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110 .text
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111 .even
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112 .ascii "XBRA"
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113 .ascii "LSDL"
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114 .comm oldmousevector,4*1
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115 _SDL_AtariXbios_MouseVector:
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116 moveml d0/a1,sp@-
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117
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118 /* Mouse buttons */
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119 moveb (a0),d0
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120 andw #3,d0
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121 movew d0,_SDL_AtariXbios_mouseb
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122
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123 /* X movement */
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124 moveb a0@(1),d0
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125 extw d0
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126 addw d0,_SDL_AtariXbios_mousex
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127
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128 /* Y movement */
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129 moveb a0@(2),d0
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130 extw d0
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131 addw d0,_SDL_AtariXbios_mousey
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132
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133 /* Jump through old vector */
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134 movel oldmousevector,a1
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135 jsr (a1)
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136
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137 moveml sp@+,d0/a1
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138 rts
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139
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140 .data
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141 .even
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142 .comm _SDL_AtariXbios_mousex,2*1
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143 .even
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144 .comm _SDL_AtariXbios_mousey,2*1
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145 .even
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146 .comm _SDL_AtariXbios_mouseb,2*1
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147
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148 /*--- Our joystick vector ---*/
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149
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150 .text
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151 .even
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152 .ascii "XBRA"
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153 .ascii "LSDL"
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154 .comm oldjoystickvector,4*1
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155 _SDL_AtariXbios_JoystickVector:
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156 moveml d0/a1,sp@-
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157
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158 /* New joystick state */
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159 moveb a0@(1),d0
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160 andw #0x8f,d0
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161 movew d0,_SDL_AtariXbios_joystick
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162
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163 /* Jump through old vector */
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164 movel oldjoystickvector,a1
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165 jsr (a1)
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166
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167 moveml sp@+,d0/a1
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168 rts
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169
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170 .data
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171 .even
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172 .comm _SDL_AtariXbios_joystick,2*1