1 | ; $Id: EMAllA.asm 20278 2007-04-09 11:56:29Z sandervl $
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2 | ;; @file
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3 | ; EM Assembly Routines.
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4 | ;
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5 |
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6 | ;
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7 | ; Copyright (C) 2006-2007 innotek GmbH
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8 | ;
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9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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10 | ; available from http://www.virtualbox.org. This file is free software;
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11 | ; you can redistribute it and/or modify it under the terms of the GNU
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12 | ; General Public License (GPL) as published by the Free Software
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13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | ;
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17 |
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18 | ;*******************************************************************************
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19 | ;* Header Files *
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20 | ;*******************************************************************************
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21 | %include "VBox/asmdefs.mac"
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22 | %include "VBox/err.mac"
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23 | %include "VBox/x86.mac"
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24 |
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25 | BEGINCODE
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26 |
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27 | ;;
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28 | ; Emulate lock CMPXCHG instruction, CDECL calling conv.
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29 | ; EMGCDECL(uint32_t) EMGCEmulateLockCmpXchg(RTGCPTR pu32Param1, uint32_t *pu32Param2, uint32_t u32Param3, size_t cbSize, uint32_t *pEflags);
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30 | ;
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31 | ; @returns eax=0 if data written, other code - invalid access, #PF was generated.
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32 | ; @param [esp + 04h] Param 1 - First parameter - pointer to first parameter
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33 | ; @param [esp + 08h] Param 2 - Second parameter - pointer to second parameter (eax)
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34 | ; @param [esp + 0ch] Param 3 - Third parameter - third parameter
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35 | ; @param [esp + 10h] Param 4 - Size of parameters, only 1/2/4 is valid.
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36 | ; @param [esp + 14h] Param 4 - Pointer to eflags (out)
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37 | ; @uses eax, ecx, edx
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38 | ;
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39 | align 16
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40 | BEGINPROC EMGCEmulateLockCmpXchg
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41 | push ebx
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42 | mov ecx, [esp + 04h + 4] ; ecx = first parameter
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43 | mov ebx, [esp + 08h + 4] ; ebx = 2nd parameter (eax)
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44 | mov edx, [esp + 0ch + 4] ; edx = third parameter
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45 | mov eax, [esp + 10h + 4] ; eax = size of parameters
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46 |
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47 | cmp al, 4
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48 | je short .do_dword ; 4 bytes variant
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49 | cmp al, 2
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50 | je short .do_word ; 2 byte variant
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51 | cmp al, 1
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52 | je short .do_byte ; 1 bytes variant
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53 | int3
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54 |
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55 | .do_dword:
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56 | ; load 2nd parameter's value
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57 | mov eax, dword [ebx]
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58 |
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59 | lock cmpxchg dword [ecx], edx ; do 4 bytes CMPXCHG
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60 | mov dword [ebx], eax
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61 | jmp short .done
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62 |
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63 | .do_word:
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64 | ; load 2nd parameter's value
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65 | mov eax, dword [ebx]
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66 |
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67 | lock cmpxchg word [ecx], dx ; do 2 bytes CMPXCHG
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68 | mov word [ebx], ax
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69 | jmp short .done
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70 |
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71 | .do_byte:
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72 | ; load 2nd parameter's value
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73 | mov eax, dword [ebx]
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74 |
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75 | lock cmpxchg byte [ecx], dl ; do 1 bytes CMPXCHG
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76 | mov byte [ebx], al
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77 |
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78 | .done:
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79 | ; collect flags and return.
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80 | pushf
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81 | pop eax
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82 |
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83 | mov edx, [esp + 14h + 4] ; eflags pointer
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84 | mov dword [edx], eax
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85 |
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86 | pop ebx
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87 | mov eax, VINF_SUCCESS
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88 | retn
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89 |
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90 | ; Read error - we will be here after our page fault handler.
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91 | GLOBALNAME EMGCEmulateLockCmpXchg_Error
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92 | pop ebx
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93 | mov eax, VERR_ACCESS_DENIED
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94 | ret
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95 |
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96 | ENDPROC EMGCEmulateLockCmpXchg
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97 |
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98 | ;;
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99 | ; Emulate CMPXCHG instruction, CDECL calling conv.
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100 | ; EMGCDECL(uint32_t) EMGCEmulateCmpXchg(RTGCPTR pu32Param1, uint32_t *pu32Param2, uint32_t u32Param3, size_t cbSize, uint32_t *pEflags);
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101 | ;
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102 | ; @returns eax=0 if data written, other code - invalid access, #PF was generated.
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103 | ; @param [esp + 04h] Param 1 - First parameter - pointer to first parameter
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104 | ; @param [esp + 08h] Param 2 - Second parameter - pointer to second parameter (eax)
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105 | ; @param [esp + 0ch] Param 3 - Third parameter - third parameter
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106 | ; @param [esp + 10h] Param 4 - Size of parameters, only 1/2/4 is valid.
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107 | ; @param [esp + 14h] Param 4 - Pointer to eflags (out)
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108 | ; @uses eax, ecx, edx
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109 | ;
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110 | align 16
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111 | BEGINPROC EMGCEmulateCmpXchg
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112 | push ebx
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113 | mov ecx, [esp + 04h + 4] ; ecx = first parameter
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114 | mov ebx, [esp + 08h + 4] ; ebx = 2nd parameter (eax)
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115 | mov edx, [esp + 0ch + 4] ; edx = third parameter
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116 | mov eax, [esp + 10h + 4] ; eax = size of parameters
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117 |
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118 | cmp al, 4
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119 | je short .do_dword ; 4 bytes variant
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120 | cmp al, 2
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121 | je short .do_word ; 2 byte variant
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122 | cmp al, 1
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123 | je short .do_byte ; 1 bytes variant
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124 | int3
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125 |
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126 | .do_dword:
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127 | ; load 2nd parameter's value
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128 | mov eax, dword [ebx]
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129 |
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130 | cmpxchg dword [ecx], edx ; do 4 bytes CMPXCHG
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131 | mov dword [ebx], eax
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132 | jmp short .done
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133 |
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134 | .do_word:
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135 | ; load 2nd parameter's value
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136 | mov eax, dword [ebx]
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137 |
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138 | cmpxchg word [ecx], dx ; do 2 bytes CMPXCHG
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139 | mov word [ebx], ax
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140 | jmp short .done
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141 |
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142 | .do_byte:
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143 | ; load 2nd parameter's value
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144 | mov eax, dword [ebx]
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145 |
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146 | cmpxchg byte [ecx], dl ; do 1 bytes CMPXCHG
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147 | mov byte [ebx], al
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148 |
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149 | .done:
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150 | ; collect flags and return.
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151 | pushf
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152 | pop eax
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153 |
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154 | mov edx, [esp + 14h + 4] ; eflags pointer
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155 | mov dword [edx], eax
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156 |
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157 | pop ebx
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158 | mov eax, VINF_SUCCESS
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159 | retn
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160 |
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161 | ; Read error - we will be here after our page fault handler.
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162 | GLOBALNAME EMGCEmulateCmpXchg_Error
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163 | pop ebx
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164 | mov eax, VERR_ACCESS_DENIED
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165 | ret
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166 | ENDPROC EMGCEmulateCmpXchg
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