1 | ; Project name : Emulation library
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2 | ; Description : Macros for emulating later x86 instructions with older
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3 | ; processors.
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4 | ; Macros are used so optimized builds can be done
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5 | ; easily for different processors.
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6 | ;
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7 | ; This file must be first to be included to
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8 | ; any source file.
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9 | %ifndef EMULATE_INC
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10 | %define EMULATE_INC
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11 |
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12 | ; Defines for processor support (should be set in makefile).
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13 | ; Unsupported instructions will be emulated using macros.
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14 | ; If AT class PC is used (instead of XT), define USE_AT
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15 |
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16 | ;%define USE_186 ; Define to use 18x/V20/V30 instructions
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17 | ;%define USE_286 ; Define to use 286 instructions
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18 | ;%define USE_386 ; Define to use 386 instructions
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19 | ;%define USE_AT ; Define for AT class machine
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20 |
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21 | %ifdef USE_386
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22 | %define USE_286 ; Define to use 286 instructions
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23 | %endif
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24 | %ifdef USE_286
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25 | %define USE_186 ; Define to use 18x/V20/V30 instructions
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26 | %define USE_UNDOC_INTEL ; Not supported by NEC V20/V30
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27 | %endif
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28 |
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29 | %ifdef USE_386
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30 | CPU 386 ; Allow instructions up to 386
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31 | %elifdef USE_286
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32 | CPU 286 ; Allow instructions up to 286
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33 | %elifdef USE_186
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34 | CPU 186 ; Allow instructions up to 188/186/V20/V30
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35 | %else
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36 | CPU 8086 ; Allow 8088/8086 instructions only
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37 | %endif
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38 |
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39 | BITS 16 ; Set 16 bit code generation
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40 |
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41 | ; Alignments for jump targets.
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42 | ; Following values are optimal for different processor types:
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43 | ; 286 and 386SX WORD (16-bit, 2 bytes)
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44 | ; 386DX and 486 DWORD (32-bit, 4 bytes)
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45 | ; Pentium and later QWORD (64-bit, 8 bytes)
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46 | %ifdef USE_AT
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47 | %ifdef USE_386
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48 | JUMP_ALIGN EQU 4
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49 | WORD_ALIGN EQU 2
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50 | %else ; USE_286
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51 | JUMP_ALIGN EQU 2
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52 | WORD_ALIGN EQU 2
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53 | %endif
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54 | %else ; XT
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55 | JUMP_ALIGN EQU 1
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56 | WORD_ALIGN EQU 1
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57 | %endif
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58 |
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59 | ;==========================================================================
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60 |
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61 | ;--------------------------------------------------------------------
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62 | ; Find String In String
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63 | ;
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64 | ; FSIS
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65 | ; Parameters:
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66 | ; %1: String to search for (case-insensitive)
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67 | ; %2: String to search in
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68 | ; Returns:
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69 | ; strpos: Position of %1 in %2 if found, 0 if not found
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70 | ;--------------------------------------------------------------------
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71 | %macro FSIS 2.nolist
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72 | %defstr s1 %1
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73 | %defstr s2 %2
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74 | %strlen sl1 s1
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75 | %strlen sl2 s2
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76 | %assign strpos 0
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77 | %if sl1 <= sl2
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78 | %assign strpos sl2 - sl1 + 1
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79 | %rep strpos
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80 | %substr %%ss s2 strpos, sl1
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81 | %ifidni %%ss, s1
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82 | %exitrep
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83 | %else
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84 | %assign strpos strpos - 1
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85 | %endif
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86 | %endrep
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87 | %endif
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88 | %endmacro
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89 |
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90 |
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91 | ;--------------------------------------------------------------------
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92 | ; The undocumented instruction SALC (Set AL According to CF).
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93 | ; Available on all Intel processors and truly compatible clones.
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94 | ; Does not work on the NEC V20/V30 or Sony CXQ70108 processors.
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95 | ;
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96 | ; eSALC
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97 | ; Parameters:
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98 | ; Nothing
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99 | ; Returns:
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100 | ; AL: FFh if CF=1
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101 | ; 00h if CF=0
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102 | ; Corrupts registers:
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103 | ; Nothing
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104 | ;--------------------------------------------------------------------
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105 | %macro eSALC 0
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106 | ; db 0D6h
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107 | salc
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108 | %endmacro
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109 |
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110 |
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111 | ;--------------------------------------------------------------------
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112 | ; The AAD instruction (ASCII Adjust before Division).
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113 | ; Available on all Intel processors and truly compatible clones.
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114 | ; Does not work on the NEC V20/V30 or Sony CXQ70108 processors
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115 | ; unless %1 is 10 (0Ah).
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116 | ;
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117 | ; eAAD
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118 | ; Parameters:
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119 | ; %1: Any 8 bit number (0...255)
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120 | ; Returns:
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121 | ; AL: AH * %1 + AL
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122 | ; AH: 0
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123 | ; Flags: Set according to result
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124 | ; Corrupts registers:
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125 | ; Nothing
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126 | ;--------------------------------------------------------------------
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127 | %macro eAAD 1
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128 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
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129 | %if %1 > 255
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130 | %error Invalid parameter passed to eAAD (%1 > 255)
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131 | %else
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132 | db 0D5h, %1
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133 | %endif
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134 | %endif
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135 | %endmacro
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136 |
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137 |
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138 | ;--------------------------------------------------------------------
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139 | ; The AAM instruction (ASCII Adjust after Multiplication).
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140 | ;
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141 | ; eAAM
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142 | ; Parameters:
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143 | ; %1: Any 8 bit number except 0 (1...255)
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144 | ; Returns:
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145 | ; AL: AL MOD %1
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146 | ; AH: AL / %1
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147 | ; Flags: Set according to result
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148 | ; Corrupts registers:
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149 | ; Nothing
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150 | ;--------------------------------------------------------------------
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151 | %macro eAAM 1
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152 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
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153 | %if %1 > 255
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154 | %error Invalid parameter passed to eAAM (%1 > 255)
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155 | %elif %1 = 0
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156 | %error Invalid parameter passed to eAAM (%1 = 0). This would cause a divide-by-zero exception!
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157 | %else
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158 | db 0D4h, %1
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159 | %endif
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160 | %endif
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161 | %endmacro
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162 |
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163 |
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164 | ;--------------------------------------------------------------------
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165 | ; Emulates BSF (Bit Scan Forward) instruction when necessary.
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166 | ; BSF is used to find index of least significant bit.
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167 | ;
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168 | ; eBSF
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169 | ; Parameters:
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170 | ; %1: Destination WORD Register for bit index (not CX or same as %2!)
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171 | ; %2: Source WORD operand where to search bit (not CX or same as %1!)
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172 | ; Returns:
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173 | ; %1: Index of highest order bit from %2
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174 | ; ZF: Set if %2 is zero
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175 | ; Cleared if %2 is non-zero
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176 | ; Corrupts registers:
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177 | ; Nothing
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178 | ;--------------------------------------------------------------------
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179 | %macro eBSF 2
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180 | %ifndef USE_386
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181 | cmp WORD %2, BYTE 0 ; Source operand is zero?
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182 | je SHORT %%Return ; If so, return with ZF set
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183 |
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184 | ; Set destination to zero and load mask for bit 0
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185 | push cx
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186 | xor %1, %1
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187 | mov cx, 1
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188 |
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189 | ALIGN JUMP_ALIGN
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190 | %%BitLoop:
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191 | test %2, cx ; Bit set?
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192 | jnz SHORT %%PopAndReturn; If so, return with ZF cleared
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193 | shl cx, 1 ; Prepare to test next bit
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194 | inc %1 ; Increment bit index
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195 | jmp SHORT %%BitLoop ; Loop until bit found
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196 | %%PopAndReturn:
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197 | pop cx
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198 | %%Return:
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199 | ;-----------------------------------
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200 | %else
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201 | bsf %1, %2
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202 | %endif
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203 | %endmacro
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204 |
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205 |
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206 | ;--------------------------------------------------------------------
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207 | ; Emulates BSR (Bit Scan Reverse) instruction when necessary.
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208 | ; BSR is used to find index of most significant bit.
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209 | ;
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210 | ; eBSR
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211 | ; Parameters:
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212 | ; %1: Destination WORD Register for bit index (not CX or same as %2!)
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213 | ; %2: Source WORD operand where to search bit (not CX or same as %1!)
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214 | ; Returns:
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215 | ; %1: Index of highest order bit from %2
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216 | ; ZF: Set if %2 is zero
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217 | ; Cleared if %2 is non-zero
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218 | ; Corrupts registers:
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219 | ; Nothing
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220 | ;--------------------------------------------------------------------
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221 | %macro eBSR 2
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222 | %ifndef USE_386
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223 | cmp WORD %2, BYTE 0 ; Source operand is zero?
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224 | je SHORT %%Return ; If so, return with ZF set
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225 |
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226 | ; Load mask for highest order bit
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227 | push cx
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228 | mov cx, 1<<15
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229 | mov %1, 15
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230 |
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231 | ALIGN JUMP_ALIGN
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232 | %%BitLoop:
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233 | test %2, cx ; Bit set?
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234 | jnz SHORT %%PopAndReturn; If so, return with ZF cleared
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235 | shr cx, 1 ; Prepare to test next bit
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236 | dec %1 ; Decrement bit index
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237 | jmp SHORT %%BitLoop ; Loop until bit found
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238 | %%PopAndReturn:
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239 | pop cx
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240 | %%Return:
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241 | ;-----------------------------------
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242 | %else
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243 | bsr %1, %2
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244 | %endif
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245 | %endmacro
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246 |
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247 |
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248 | ;--------------------------------------------------------------------
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249 | ; Conditional Move.
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250 | ;
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251 | ; eCMOVcc
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252 | ; Parameters:
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253 | ; %1: Destination data
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254 | ; %2: Source data
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255 | ; Returns:
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256 | ; Nothing
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257 | ; Corrupts registers:
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258 | ; Nothing
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259 | ;--------------------------------------------------------------------
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260 | %macro eCMOVA 2
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261 | jbe SHORT %%Return
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262 | mov %1, %2
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263 | %%Return:
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264 | %endmacro
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265 |
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266 | %macro eCMOVC 2
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267 | jnc SHORT %%Return
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268 | mov %1, %2
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269 | %%Return:
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270 | %endmacro
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271 |
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272 | %macro eCMOVNC 2
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273 | jc SHORT %%Return
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274 | mov %1, %2
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275 | %%Return:
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276 | %endmacro
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277 |
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278 | %macro eCMOVZ 2
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279 | jnz SHORT %%Return
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280 | mov %1, %2
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281 | %%Return:
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282 | %endmacro
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283 |
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284 | %macro eCMOVNZ 2
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285 | jz SHORT %%Return
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286 | mov %1, %2
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287 | %%Return:
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288 | %endmacro
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289 |
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290 | %macro eCMOVE 2
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291 | eCMOVZ %1, %2
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292 | %endmacro
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293 |
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294 | %macro eCMOVNE 2
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295 | eCMOVNZ %1, %2
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296 | %endmacro
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297 |
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298 | %macro eCMOVB 2
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299 | eCMOVC %1, %2
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300 | %endmacro
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301 |
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302 | %macro eCMOVS 2
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303 | jns SHORT %%Return
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304 | mov %1, %2
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305 | %%Return:
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306 | %endmacro
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307 |
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308 | %macro eCMOVNS 2
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309 | js SHORT %%Return
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310 | mov %1, %2
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311 | %%Return:
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312 | %endmacro
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313 |
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314 |
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315 | ;--------------------------------------------------------------------
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316 | ; Conditional Set.
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317 | ;
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318 | ; eSETcc
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319 | ; Parameters:
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320 | ; %1: Destination data
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321 | ; Returns:
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322 | ; Nothing
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323 | ; Corrupts registers:
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324 | ; Flags
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325 | ;--------------------------------------------------------------------
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326 | %macro eSETZ 1
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327 | mov %1, 0 ; Clear while preserving flags
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328 | jnz SHORT %%Return ; Nothing to set
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329 | inc %1
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330 | %%Return:
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331 | %endmacro
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332 |
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333 | %macro eSETNZ 1
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334 | mov %1, 0 ; Clear while preserving flags
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335 | jz SHORT %%Return ; Nothing to set
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336 | inc %1
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337 | %%Return:
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338 | %endmacro
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339 |
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340 |
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341 | ;--------------------------------------------------------------------
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342 | ; Moves byte with zero-extending to any Register.
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343 | ;
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344 | ; eMOVZX
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345 | ; Parameters:
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346 | ; %1: Destination Register (SP not supported)
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347 | ; %2: Byte register or byte address
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348 | ; Returns:
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349 | ; Nothing
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350 | ; Corrupts registers:
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351 | ; FLAGS
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352 | ;--------------------------------------------------------------------
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353 | %macro eMOVZX 2
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354 | %ifndef USE_386
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355 | %ifidni %1, ax
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356 | mov al, %2
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357 | xor ah, ah
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358 | %elifidni %1, bx
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359 | mov bl, %2
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360 | xor bh, bh ; %2 may use BX in effective address
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361 | %elifidni %1, cx
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362 | mov cl, %2
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363 | xor ch, ch
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364 | %elifidni %1, dx
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365 | mov dl, %2
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366 | xor dh, dh
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367 | %else ; SI, DI, BP (all may be used in effective address)
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368 | FSIS %1, %2
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369 | %if strpos
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370 | push ax
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371 | mov al, %2
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372 | xor ah, ah
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373 | xchg %1, ax
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374 | pop ax
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375 | %else
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376 | xchg %1, ax
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377 | mov al, %2
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378 | xor ah, ah
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379 | xchg %1, ax
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380 | %endif
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381 | %endif
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382 | ;-----------------------------------
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383 | %else
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384 | movzx %1, %2
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385 | %endif
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386 | %endmacro
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387 |
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388 |
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389 | ;--------------------------------------------------------------------
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390 | ; Emulates PUSHA instruction when necessary.
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391 | ;
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392 | ; ePUSHA
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393 | ; Parameters:
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394 | ; Nothing
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395 | ; Returns:
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396 | ; Nothing
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397 | ; Corrupts registers:
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398 | ; Nothing
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399 | ;--------------------------------------------------------------------
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400 | %macro ePUSHA 0
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401 | %ifndef USE_186
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402 | push ax
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403 | push cx
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404 | push dx
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405 | push bx
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406 | push sp
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407 | push bp
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408 | push si
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409 | push di
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410 | ;-----------------------------------
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411 | %else
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412 | pusha
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413 | %endif
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414 | %endmacro
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415 |
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416 |
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417 | ;--------------------------------------------------------------------
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418 | ; Emulates POPA instruction when necessary.
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419 | ;
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420 | ; ePOPA
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421 | ; Parameters:
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422 | ; Nothing
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423 | ; Returns:
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424 | ; Nothing
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425 | ; Corrupts registers:
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426 | ; Nothing
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427 | ;--------------------------------------------------------------------
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428 | %macro ePOPA 0
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429 | %ifndef USE_186
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430 | pop di
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431 | pop si
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432 | pop bp
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433 | pop ax ; Skip SP
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434 | pop bx
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435 | pop dx
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436 | pop cx
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437 | pop ax
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438 | ;-----------------------------------
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439 | %else
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440 | popa
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441 | %endif
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442 | %endmacro
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443 |
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444 |
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445 | ;--------------------------------------------------------------------
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446 | ; Emulates ENTER instruction when necessary.
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447 | ;
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448 | ; eENTER
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449 | ; Parameters:
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450 | ; %1: Number of bytes to reserve from stack
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451 | ; %2: The lexical nesting level (not emulated, set to 0)
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452 | ; Returns:
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453 | ; SS:BP: Ptr to old BP
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454 | ; ([bp-2] points to highest local stack frame word)
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455 | ; Corrupts registers:
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456 | ; FLAGS
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457 | ;--------------------------------------------------------------------
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458 | %macro eENTER 2
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459 | %ifndef USE_186
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460 | push bp
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461 | mov bp, sp
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462 | sub sp, %1
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463 | ;-----------------------------------
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464 | %else
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465 | enter %1, %2
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466 | %endif
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467 | %endmacro
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468 |
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469 | ;--------------------------------------------------------------------
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470 | ; Emulates LEAVE instruction when necessary.
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471 | ;
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472 | ; eLEAVE
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473 | ; Parameters:
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474 | ; Nothing
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475 | ; Returns:
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476 | ; BP: What it was before eENTER
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477 | ; Corrupts registers:
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478 | ; Nothing
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479 | ;--------------------------------------------------------------------
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480 | %macro eLEAVE 0
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481 | %ifndef USE_186
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482 | mov sp, bp
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483 | pop bp
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484 | ;-----------------------------------
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485 | %else
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486 | leave
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487 | %endif
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488 | %endmacro
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489 |
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490 |
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491 | ;--------------------------------------------------------------------
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492 | ; Emulates LSS instruction when necessary.
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493 | ;
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494 | ; eLSS
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495 | ; Parameters:
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496 | ; %1: Destination register
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497 | ; %2: Source memory address without brackets
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498 | ; Returns:
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499 | ; IF: 0 (interrupts disabled)
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500 | ; Corrupts registers:
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501 | ; Nothing
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502 | ;--------------------------------------------------------------------
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503 | %macro eLSS 2
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504 | %ifndef USE_386
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505 | cli ; Disable interrupts
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506 | mov %1, [%2] ; Load offset
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507 | mov ss, [%2+2] ; Load segment
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508 | ;-----------------------------------
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509 | %else
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510 | lss %1, [%2]
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511 | %endif
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512 | %endmacro
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513 |
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514 |
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515 | ;--------------------------------------------------------------------
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516 | ; Repeats string instruction with segment override.
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517 | ; This macro prevents 8088/8086 restart bug.
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518 | ;
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519 | ; eSEG_STR
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520 | ; Parameters:
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521 | ; %1: REP/REPE/REPZ or REPNE/REPNZ prefix
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522 | ; %2: Source segment override (destination is always ES)
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523 | ; %3: String instruction
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524 | ; CX: Repeat count
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525 | ; Returns:
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526 | ; FLAGS for cmps and scas only
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527 | ; Corrupts registers:
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528 | ; FLAGS
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529 | ;--------------------------------------------------------------------
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530 | %macro eSEG_STR 3
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531 | %ifndef USE_186 ; 8088/8086 has string instruction restart bug when more than one prefix
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---|
532 | %%Loop:
|
---|
533 | %1 ; REP is the prefix that can be lost
|
---|
534 | %2 ; SEG is the prefix that won't be lost
|
---|
535 | %3 ; String instruction
|
---|
536 | FSIS cmps, %3
|
---|
537 | %ifn strpos
|
---|
538 | FSIS scas, %3
|
---|
539 | %endif
|
---|
540 | %if strpos ; Must preserve FLAGS
|
---|
541 | jcxz %%End ; Jump to end if no repeats left (preserves FLAGS)
|
---|
542 | jmp SHORT %%Loop ; Loop while repeats left
|
---|
543 | %%End:
|
---|
544 | %else ; No need to preserve FLAGS
|
---|
545 | inc cx
|
---|
546 | loop %%Loop
|
---|
547 | %endif
|
---|
548 | %else ; No bug on V20/V30 and later, don't know about 188/186
|
---|
549 | %2
|
---|
550 | %1 %3
|
---|
551 | %endif
|
---|
552 | %endmacro
|
---|
553 |
|
---|
554 |
|
---|
555 | ;--------------------------------------------------------------------
|
---|
556 | ; Bit shifts and rotates with immediate.
|
---|
557 | ;
|
---|
558 | ; eSHIFT_IM
|
---|
559 | ; Parameters:
|
---|
560 | ; %1: Shift target
|
---|
561 | ; %2: Number of bits to shift
|
---|
562 | ; %3: Instruction (SHL, SHR, ROL, ROR, RCL, RCR)
|
---|
563 | ; Returns:
|
---|
564 | ; FLAGS
|
---|
565 | ; Corrupts registers:
|
---|
566 | ; Nothing
|
---|
567 | ;--------------------------------------------------------------------
|
---|
568 | %macro eSHIFT_IM 3
|
---|
569 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
|
---|
570 | %ifndef USE_186
|
---|
571 | %ifidni %1, cl
|
---|
572 | times %2 %3 %1, 1
|
---|
573 | %elifidni %1, ch
|
---|
574 | times %2 %3 %1, 1
|
---|
575 | %elifidni %1, cx
|
---|
576 | times %2 %3 %1, 1
|
---|
577 | %else
|
---|
578 | %if %2 > 3 ; Size optimized value
|
---|
579 | push cx
|
---|
580 | mov cl, %2
|
---|
581 | %3 %1, cl
|
---|
582 | pop cx
|
---|
583 | %else
|
---|
584 | times %2 %3 %1, 1
|
---|
585 | %endif
|
---|
586 | %endif
|
---|
587 | ;-----------------------------------
|
---|
588 | %else
|
---|
589 | %3 %1, %2
|
---|
590 | %endif
|
---|
591 | %endif
|
---|
592 | %endmacro
|
---|
593 |
|
---|
594 | %macro eSHR_IM 2
|
---|
595 | eSHIFT_IM %1, %2, shr
|
---|
596 | %endmacro
|
---|
597 |
|
---|
598 | %macro eSHL_IM 2
|
---|
599 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
|
---|
600 | %ifdef USE_386
|
---|
601 | %if %2 = 1
|
---|
602 | FSIS ], %1
|
---|
603 | %if strpos
|
---|
604 | eSHIFT_IM %1, %2, shl
|
---|
605 | %else
|
---|
606 | add %1, %1 ; Same size but faster on 386 and 486.
|
---|
607 | %endif
|
---|
608 | %else
|
---|
609 | eSHIFT_IM %1, %2, shl
|
---|
610 | %endif
|
---|
611 | %else
|
---|
612 | eSHIFT_IM %1, %2, shl
|
---|
613 | %endif
|
---|
614 | %endif
|
---|
615 | %endmacro
|
---|
616 |
|
---|
617 | %macro eROR_IM 2
|
---|
618 | eSHIFT_IM %1, %2, ror
|
---|
619 | %endmacro
|
---|
620 |
|
---|
621 | %macro eROL_IM 2
|
---|
622 | eSHIFT_IM %1, %2, rol
|
---|
623 | %endmacro
|
---|
624 |
|
---|
625 | %macro eRCR_IM 2
|
---|
626 | eSHIFT_IM %1, %2, rcr
|
---|
627 | %endmacro
|
---|
628 |
|
---|
629 | %macro eRCL_IM 2
|
---|
630 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
|
---|
631 | %ifdef USE_386
|
---|
632 | %if %2 = 1
|
---|
633 | FSIS ], %1
|
---|
634 | %if strpos
|
---|
635 | eSHIFT_IM %1, %2, rcl
|
---|
636 | %else
|
---|
637 | adc %1, %1 ; Same size but faster on 386 and 486.
|
---|
638 | %endif
|
---|
639 | %else
|
---|
640 | eSHIFT_IM %1, %2, rcl
|
---|
641 | %endif
|
---|
642 | %else
|
---|
643 | eSHIFT_IM %1, %2, rcl
|
---|
644 | %endif
|
---|
645 | %endif
|
---|
646 | %endmacro
|
---|
647 |
|
---|
648 |
|
---|
649 | ;--------------------------------------------------------------------
|
---|
650 | ; Emulates PUSH imm instruction when necessary.
|
---|
651 | ;
|
---|
652 | ; ePUSH_I
|
---|
653 | ; Parameters:
|
---|
654 | ; %1: Immediate to push
|
---|
655 | ; Returns:
|
---|
656 | ; Nothing
|
---|
657 | ; Corrupts registers:
|
---|
658 | ; Nothing
|
---|
659 | ;--------------------------------------------------------------------
|
---|
660 | %macro ePUSH_I 1
|
---|
661 | %ifndef USE_186
|
---|
662 | push bp ; Immediate goes here
|
---|
663 | push bp
|
---|
664 | mov bp, sp
|
---|
665 | mov WORD [bp+2], %1
|
---|
666 | pop bp
|
---|
667 | ;-----------------------------------
|
---|
668 | %else
|
---|
669 | push %1
|
---|
670 | %endif
|
---|
671 | %endmacro
|
---|
672 |
|
---|
673 |
|
---|
674 | ;--------------------------------------------------------------------
|
---|
675 | ; Emulates PUSH imm instruction when necessary.
|
---|
676 | ; ePUSH_T uses temporary register for faster performance
|
---|
677 | ; and smaller code size than ePUSH_I.
|
---|
678 | ;
|
---|
679 | ; ePUSH_T
|
---|
680 | ; Parameters:
|
---|
681 | ; %1: Temporary Register
|
---|
682 | ; %2: Immediate to push
|
---|
683 | ; Returns:
|
---|
684 | ; Nothing
|
---|
685 | ; Corrupts registers:
|
---|
686 | ; %1
|
---|
687 | ;--------------------------------------------------------------------
|
---|
688 | %macro ePUSH_T 2
|
---|
689 | %ifndef USE_186
|
---|
690 | %ifidni %2, 0
|
---|
691 | xor %1, %1
|
---|
692 | %else
|
---|
693 | mov %1, %2
|
---|
694 | %endif
|
---|
695 | push %1
|
---|
696 | ;-----------------------------------
|
---|
697 | %else
|
---|
698 | push %2
|
---|
699 | %endif
|
---|
700 | %endmacro
|
---|
701 |
|
---|
702 |
|
---|
703 | %endif ; EMULATE_INC
|
---|