1 | ; $Id: prfx86msc.asm 29 2009-07-01 20:30:29Z bird $
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2 | ;; @file
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3 | ; kProfiler Mark 2 - Microsoft C/C++ Compiler Interaction, x86.
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4 | ;
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5 |
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6 | ;
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7 | ; Copyright (c) 2006-2007 Knut St. Osmundsen <[email protected]>
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8 | ;
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9 | ; Permission is hereby granted, free of charge, to any person
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10 | ; obtaining a copy of this software and associated documentation
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11 | ; files (the "Software"), to deal in the Software without
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12 | ; restriction, including without limitation the rights to use,
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13 | ; copy, modify, merge, publish, distribute, sublicense, and/or sell
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14 | ; copies of the Software, and to permit persons to whom the
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15 | ; Software is furnished to do so, subject to the following
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16 | ; conditions:
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17 | ;
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18 | ; The above copyright notice and this permission notice shall be
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19 | ; included in all copies or substantial portions of the Software.
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20 | ;
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21 | ; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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22 | ; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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23 | ; OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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24 | ; NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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25 | ; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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26 | ; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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27 | ; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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28 | ; OTHER DEALINGS IN THE SOFTWARE.
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29 | ;
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30 |
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31 | [section .data]
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32 | ;
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33 | g_fCalibrated:
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34 | dd 0
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35 | g_OverheadAdj:
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36 | dd 0
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37 |
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38 | [section .text]
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39 |
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40 | extern KPRF_ENTER
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41 | extern KPRF_LEAVE
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42 |
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43 | global __penter
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44 | global __pexit
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45 |
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46 | ;ifdef UNDEFINED
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47 | global common_return_path
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48 | global common_overhead
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49 | global common_no_overhead
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50 | global calibrate
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51 | global calib_inner_update_minimum
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52 | global calib_inner_next
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53 | global calib_outer_dec
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54 | global calib_outer_inc
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55 | global calib_done
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56 | global calib_nullproc
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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 | ; On x86 the call to this function has been observed to be put before
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62 | ; creating the stack frame, as the very first instruction in the function.
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63 | ;
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64 | ; Thus the stack layout is as follows:
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65 | ; 24 return address of the calling function.
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66 | ; 20 our return address - the address of the calling function + 5.
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67 | ; 1c eax
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68 | ; 18 edx
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69 | ; 14 eflags
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70 | ; 10 ecx
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71 | ; c tsc high - param 3
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72 | ; 8 tsc low
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73 | ; 4 frame pointer - param 2
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74 | ; 0 function ptr - param 1
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75 | ;
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76 | ;
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77 | align 16
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78 | __penter:
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79 | ; save volatile register and get the time stamp.
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80 | push eax
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81 | push edx
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82 | rdtsc
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83 | pushfd
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84 | push ecx
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85 |
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86 | ; setting up the enter call frame (cdecl).
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87 | sub esp, 4 + 4 + 8
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88 | mov [esp + 0ch], edx ; Param 3 - the timestamp
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89 | mov [esp + 08h], eax
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90 | lea edx, [esp + 24h] ; Param 2 - frame pointer (pointer to the return address of the function calling us)
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91 | mov [esp + 04h], edx
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92 | mov eax, [esp + 20h] ; Param 1 - The function address
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93 | sub eax, 5 ; call instruction
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94 | mov [esp], eax
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95 |
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96 | call KPRF_ENTER
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97 | jmp common_return_path
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98 |
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99 |
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100 | ;;
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101 | ; On x86 the call to this function has been observed to be put right before
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102 | ; return instruction. This fact matters since since we have to calc the same
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103 | ; stack address as in _penter.
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104 | ;
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105 | ; Thus the stack layout is as follows:
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106 | ; 24 return address of the calling function.
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107 | ; 20 our return address - the address of the calling function + 5.
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108 | ; 1c eax
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109 | ; 18 edx
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110 | ; 14 eflags
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111 | ; 10 ecx
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112 | ; c tsc high - param 3
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113 | ; 8 tsc low
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114 | ; 4 frame pointer - param 2
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115 | ; 0 function ptr - param 1
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116 | ;
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117 | ;
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118 | align 16
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119 | __pexit:
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120 | ; save volatile register and get the time stamp.
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121 | push eax
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122 | push edx
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123 | rdtsc
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124 | pushfd
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125 | push ecx
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126 |
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127 | ; setting up the leave call frame (cdecl).
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128 | sub esp, 4 + 4 + 8
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129 | mov [esp + 0ch], edx ; Param 3 - the timestamp
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130 | mov [esp + 08h], eax
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131 | lea edx, [esp + 24h] ; Param 2 - frame pointer (pointer to the return address of the function calling us)
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132 | mov [esp + 04h], edx
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133 | mov eax, [esp + 20h] ; Param 1 - Some address in the function.
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134 | sub eax, 5 ; call instruction
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135 | mov [esp], eax
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136 |
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137 | call KPRF_LEAVE
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138 | jmp common_return_path
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139 |
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140 |
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141 | ;;
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142 | ; This is the common return path for both the enter and exit hooks.
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143 | ; It's kept common because we can then use the same overhead adjustment
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144 | ; and save some calibration efforts. It also saves space :-)
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145 | align 16
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146 | common_return_path:
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147 | ; Update overhead
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148 | test eax, eax
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149 | jz common_no_overhead
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150 | cmp byte [g_fCalibrated], 0
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151 | jnz common_overhead
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152 | call calibrate
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153 | common_overhead:
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154 | mov ecx, eax ; ecx <- pointer to overhead counter.
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155 | mov eax, [g_OverheadAdj] ; apply the adjustment before reading tsc
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156 | sub [esp + 08h], eax
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157 | sbb dword [esp + 0ch], 0
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158 |
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159 | rdtsc
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160 | sub eax, [esp + 08h]
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161 | sbb edx, [esp + 0ch]
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162 | add [ecx], eax
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163 | adc [ecx + 4], edx
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164 | common_no_overhead:
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165 | add esp, 4 + 4 + 8
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166 |
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167 | ; restore volatile registers.
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168 | pop ecx
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169 | popfd
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170 | pop edx
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171 | pop eax
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172 | ret
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173 |
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174 | ;;
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175 | ; Data esi points to while we're calibrating.
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176 | struc CALIBDATA
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177 | .OverheadLo resd 1
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178 | .OverheadHi resd 1
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179 | .ProfiledLo resd 1
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180 | .ProfiledHi resd 1
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181 | .EnterTSLo resd 1
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182 | .EnterTSHi resd 1
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183 | .MinLo resd 1
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184 | .MinHi resd 1
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185 | endstruc
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186 |
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187 |
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188 |
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189 | align 16
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190 | ;;
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191 | ; Do necessary calibrations.
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192 | ;
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193 | calibrate:
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194 | ; prolog
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195 | push ebp
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196 | mov ebp, esp
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197 | pushfd
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198 | pushad
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199 | sub esp, CALIBDATA_size
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200 | mov esi, esp ; esi points to the CALIBDATA
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201 |
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202 | ;
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203 | ; Indicate that we have finished calibrating.
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204 | ;
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205 | mov eax, 1
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206 | xchg dword [g_fCalibrated], eax
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207 |
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208 | ;
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209 | ; The outer loop - find the right adjustment.
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210 | ;
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211 | mov ebx, 200h ; loop counter.
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212 | calib_outer_loop:
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213 |
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214 | ;
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215 | ; The inner loop - calls the function number of times to establish a
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216 | ; good minimum value
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217 | ;
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218 | mov ecx, 200h
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219 | mov dword [esi + CALIBDATA.MinLo], 0ffffffffh
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220 | mov dword [esi + CALIBDATA.MinHi], 07fffffffh
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221 | calib_inner_loop:
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222 |
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223 | ; zero the overhead and profiled times.
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224 | xor eax, eax
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225 | mov [esi + CALIBDATA.OverheadLo], eax
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226 | mov [esi + CALIBDATA.OverheadHi], eax
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227 | mov [esi + CALIBDATA.ProfiledLo], eax
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228 | mov [esi + CALIBDATA.ProfiledHi], eax
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229 | call calib_nullproc
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230 |
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231 | ; subtract the overhead
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232 | mov eax, [esi + CALIBDATA.ProfiledLo]
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233 | mov edx, [esi + CALIBDATA.ProfiledHi]
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234 | sub eax, [esi + CALIBDATA.OverheadLo]
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235 | sbb edx, [esi + CALIBDATA.OverheadHi]
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236 |
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237 | ; update the minimum value.
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238 | test edx, 080000000h
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239 | jnz near calib_outer_dec ; if negative, just simplify and shortcut
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240 | cmp edx, [esi + CALIBDATA.MinHi]
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241 | jg calib_inner_next
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242 | jl calib_inner_update_minimum
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243 | cmp eax, [esi + CALIBDATA.MinLo]
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244 | jge calib_inner_next
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245 | calib_inner_update_minimum:
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246 | mov [esi + CALIBDATA.MinLo], eax
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247 | mov [esi + CALIBDATA.MinHi], edx
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248 | calib_inner_next:
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249 | loop calib_inner_loop
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250 |
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251 | ; Is the minimum value acceptable?
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252 | test dword [esi + CALIBDATA.MinHi], 80000000h
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253 | jnz calib_outer_dec ; simplify if negative.
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254 | cmp dword [esi + CALIBDATA.MinHi], 0
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255 | jnz calib_outer_inc ; this shouldn't be possible
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256 | cmp dword [esi + CALIBDATA.MinLo], 1fh
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257 | jbe calib_outer_dec ; too low - 2 ticks per pair is the minimum!
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258 | cmp dword [esi + CALIBDATA.MinLo], 30h
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259 | jbe calib_done ; this is fine!
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260 | calib_outer_inc:
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261 | inc dword [g_OverheadAdj]
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262 | jmp calib_outer_next
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263 | calib_outer_dec:
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264 | cmp dword [g_OverheadAdj], 1
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265 | je calib_done
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266 | dec dword [g_OverheadAdj]
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267 | calib_outer_next:
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268 | dec ebx
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269 | jnz calib_outer_loop
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270 | calib_done:
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271 |
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272 | ; epilog
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273 | add esp, CALIBDATA_size
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274 | popad
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275 | popfd
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276 | leave
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277 | ret
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278 |
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279 |
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280 |
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281 |
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282 | ;;
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283 | ; The calibration __penter - this must be identical to the real thing except for the KPRF call.
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284 | align 16
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285 | calib_penter:
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286 | ; This part must be identical
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287 | push eax
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288 | push edx
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289 | rdtsc
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290 | pushfd
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291 | push ecx
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292 |
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293 | ; store the entry
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294 | mov [esi + CALIBDATA.EnterTSLo], eax
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295 | mov [esi + CALIBDATA.EnterTSHi], edx
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296 |
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297 | ; create the call frame
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298 | push edx
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299 | push eax
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300 | push 0
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301 | push 0
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302 |
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303 | lea eax, [esi + CALIBDATA.OverheadLo]
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304 | jmp common_overhead
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305 |
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306 |
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307 | ;;
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308 | ; The calibration __pexit - this must be identical to the real thing except for the KPRF call.
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309 | align 16
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310 | calib_pexit:
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311 | ; This part must be identical
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312 | push eax
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313 | push edx
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314 | rdtsc
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315 | pushfd
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316 | push ecx
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317 |
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318 | ; update the time
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319 | push eax
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320 | push edx
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321 | sub eax, [esi + CALIBDATA.EnterTSLo]
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322 | sbb edx, [esi + CALIBDATA.EnterTSHi]
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323 | add [esi + CALIBDATA.ProfiledLo], eax
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324 | adc [esi + CALIBDATA.ProfiledHi], edx
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325 | pop edx
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326 | pop eax
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327 |
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328 | ; create the call frame
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329 | push edx
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330 | push eax
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331 | push 0
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332 | push 0
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333 |
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334 | lea eax, [esi + CALIBDATA.EnterTSLo]
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335 | jmp common_overhead
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336 |
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337 |
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338 | ;;
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339 | ; The 'function' we're profiling.
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340 | ; The general idea is that each pair should take something like 2-10 ticks.
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341 | ;
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342 | ; (Btw. If we don't use multiple pairs here, we end up with the wrong result.)
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343 | align 16
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344 | calib_nullproc:
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345 | call calib_penter ;0
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346 | call calib_pexit
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347 |
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348 | call calib_penter ;1
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349 | call calib_pexit
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350 |
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351 | call calib_penter ;2
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352 | call calib_pexit
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353 |
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354 | call calib_penter ;3
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355 | call calib_pexit
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356 |
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357 | call calib_penter ;4
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358 | call calib_pexit
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359 |
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360 | call calib_penter ;5
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361 | call calib_pexit
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362 |
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363 | call calib_penter ;6
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364 | call calib_pexit
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365 |
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366 | call calib_penter ;7
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367 | call calib_pexit
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368 |
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369 | call calib_penter ;8
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370 | call calib_pexit
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371 |
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372 | call calib_penter ;9
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373 | call calib_pexit
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374 |
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375 | call calib_penter ;a
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376 | call calib_pexit
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377 |
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378 | call calib_penter ;b
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379 | call calib_pexit
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380 |
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381 | call calib_penter ;c
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382 | call calib_pexit
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383 |
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384 | call calib_penter ;d
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385 | call calib_pexit
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386 |
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387 | call calib_penter ;e
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388 | call calib_pexit
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389 |
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390 | call calib_penter ;f
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391 | call calib_pexit
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392 | ret
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393 |
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