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1 // Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of the License "Symbian Foundation License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.symbianfoundation.org/legal/sfl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // e32\common\x86\x86hlp_gcc.inl |
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15 // If there are no exports then GCC 3.4.x does not generate a .reloc |
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16 // section, without which rombuild can't relocate the .code section |
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17 // to its ROM address. Your ROM then goes boom early in the boot sequence. |
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18 // This unused export forces the PE to be generated with a .reloc section. |
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19 // |
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20 // |
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21 |
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22 EXPORT_C void __ignore_this_export() |
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23 { |
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24 } |
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25 |
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26 static void DivisionByZero() |
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27 { |
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28 asm("int 0"); |
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29 } |
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30 |
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31 extern "C" { |
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32 |
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33 void __NAKED__ _alloca() |
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34 { |
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35 // GCC passes the param in eax and expects no return value |
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36 asm("pop ecx"); |
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37 asm("sub esp, eax"); |
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38 asm("push ecx"); |
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39 asm("ret"); |
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40 } |
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41 |
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42 void __NAKED__ _allmul() |
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43 // |
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44 // Multiply two 64 bit integers returning a 64 bit result |
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45 // On entry: |
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46 // [esp+4], [esp+8] = arg 1 |
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47 // [esp+12], [esp+16] = arg 1 |
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48 // Return result in edx:eax |
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49 // Remove arguments from stack |
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50 // |
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51 { |
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52 asm("mov eax, [esp+4]"); // eax = low1 |
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53 asm("mul dword ptr [esp+16]"); // edx:eax = low1*high2 |
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54 asm("mov ecx, eax"); // keep low 32 bits of product |
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55 asm("mov eax, [esp+8]"); // eax = high1 |
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56 asm("mul dword ptr [esp+12]"); // edx:eax = high1*low2 |
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57 asm("add ecx, eax"); // accumulate low 32 bits of product |
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58 asm("mov eax, [esp+4]"); // eax = low1 |
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59 asm("mul dword ptr [esp+12]"); // edx:eax = low1*low2 |
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60 asm("add edx, ecx"); // add cross terms to high 32 bits |
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61 asm("ret"); |
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62 } |
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63 |
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64 void __NAKED__ udiv64_divby0() |
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65 { |
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66 asm("int 0"); // division by zero exception |
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67 asm("ret"); |
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68 } |
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69 |
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70 __NAKED__ /*LOCAL_C*/ void UDiv64() |
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71 { |
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72 // unsigned divide edx:eax by edi:esi |
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73 // quotient in ebx:eax, remainder in edi:edx |
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74 // ecx, ebp, esi also modified |
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75 asm("test edi, edi"); |
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76 asm("jnz short UDiv64a"); // branch if divisor >= 2^32 |
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77 asm("test esi, esi"); |
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78 asm("jz %a0": : "i"(&DivisionByZero)); // if divisor=0, branch to error routine |
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79 asm("mov ebx, eax"); // ebx=dividend low |
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80 asm("mov eax, edx"); // eax=dividend high |
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81 asm("xor edx, edx"); // edx=0 |
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82 asm("div esi"); // quotient high now in eax |
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83 asm("xchg eax, ebx"); // quotient high in ebx, dividend low in eax |
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84 asm("div esi"); // quotient now in ebx:eax, remainder in edi:edx |
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85 asm("ret"); |
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86 asm("UDiv64e:"); |
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87 asm("xor eax, eax"); // set result to 0xFFFFFFFF |
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88 asm("dec eax"); |
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89 asm("jmp short UDiv64f"); |
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90 asm("UDiv64a:"); |
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91 asm("js short UDiv64b"); // skip if divisor msb set |
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92 asm("bsr ecx, edi"); // ecx=bit number of divisor msb - 32 |
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93 asm("inc cl"); |
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94 asm("push edi"); // save divisor high |
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95 asm("push esi"); // save divisor low |
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96 asm("shrd esi, edi, cl"); // shift divisor right so that msb is bit 31 |
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97 asm("mov ebx, edx"); // dividend into ebx:ebp |
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98 asm("mov ebp, eax"); |
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99 asm("shrd eax, edx, cl"); // shift dividend right same number of bits |
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100 asm("shr edx, cl"); |
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101 asm("cmp edx, esi"); // check if approx quotient will be 2^32 |
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102 asm("jae short UDiv64e"); // if so, true result must be 0xFFFFFFFF |
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103 asm("div esi"); // approximate quotient now in eax |
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104 asm("UDiv64f:"); |
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105 asm("mov ecx, eax"); // into ecx |
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106 asm("mul edi"); // multiply approx. quotient by divisor high |
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107 asm("mov esi, eax"); // ls dword into esi, ms into edi |
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108 asm("mov edi, edx"); |
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109 asm("mov eax, ecx"); // approx. quotient into eax |
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110 asm("mul dword ptr [esp]"); // multiply approx. quotient by divisor low |
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111 asm("add edx, esi"); // edi:edx:eax now equals approx. quotient * divisor |
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112 asm("adc edi, 0"); |
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113 asm("xor esi, esi"); |
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114 asm("sub ebp, eax"); // subtract dividend - approx. quotient *divisor |
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115 asm("sbb ebx, edx"); |
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116 asm("sbb esi, edi"); |
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117 asm("jnc short UDiv64c"); // if no borrow, result OK |
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118 asm("dec ecx"); // else result is one too big |
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119 asm("add ebp, [esp]"); // and add divisor to get correct remainder |
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120 asm("adc ebx, [esp+4]"); |
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121 asm("UDiv64c:"); |
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122 asm("mov eax, ecx"); // result into ebx:eax, remainder into edi:edx |
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123 asm("mov edi, ebx"); |
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124 asm("mov edx, ebp"); |
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125 asm("xor ebx, ebx"); |
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126 asm("add esp, 8"); // remove temporary values from stack |
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127 asm("ret"); |
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128 asm("UDiv64b:"); |
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129 asm("mov ebx, 1"); |
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130 asm("sub eax, esi"); // subtract divisor from dividend |
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131 asm("sbb edx, edi"); |
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132 asm("jnc short UDiv64d"); // if no borrow, result=1, remainder in edx:eax |
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133 asm("add eax, esi"); // else add back |
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134 asm("adc edx, edi"); |
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135 asm("dec ebx"); // and decrement quotient |
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136 asm("UDiv64d:"); |
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137 asm("mov edi, edx"); // remainder into edi:edx |
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138 asm("mov edx, eax"); |
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139 asm("mov eax, ebx"); // result in ebx:eax |
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140 asm("xor ebx, ebx"); |
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141 asm("ret"); |
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142 } |
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143 |
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144 __NAKED__ void _aulldvrm() |
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145 // |
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146 // Divide two 64 bit unsigned integers, returning a 64 bit result |
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147 // and a 64 bit remainder |
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148 // |
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149 // On entry: |
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150 // [esp+4], [esp+8] = dividend |
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151 // [esp+12], [esp+16] = divisor |
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152 // |
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153 // Return (dividend / divisor) in edx:eax |
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154 // Return (dividend % divisor) in ebx:ecx |
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155 // |
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156 // Remove arguments from stack |
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157 // |
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158 { |
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159 asm("push ebp"); |
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160 asm("push edi"); |
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161 asm("push esi"); |
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162 asm("mov eax, [esp+16]"); |
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163 asm("mov edx, [esp+20]"); |
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164 asm("mov esi, [esp+24]"); |
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165 asm("mov edi, [esp+28]"); |
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166 asm("call %a0": : "i"(&UDiv64)); |
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167 asm("mov ecx, edx"); |
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168 asm("mov edx, ebx"); |
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169 asm("mov ebx, edi"); |
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170 asm("pop esi"); |
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171 asm("pop edi"); |
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172 asm("pop ebp"); |
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173 asm("ret"); |
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174 } |
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175 |
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176 __NAKED__ void _alldvrm() |
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177 // |
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178 // Divide two 64 bit signed integers, returning a 64 bit result |
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179 // and a 64 bit remainder |
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180 // |
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181 // On entry: |
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182 // [esp+4], [esp+8] = dividend |
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183 // [esp+12], [esp+16] = divisor |
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184 // |
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185 // Return (dividend / divisor) in edx:eax |
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186 // Return (dividend % divisor) in ebx:ecx |
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187 // |
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188 // Remove arguments from stack |
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189 // |
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190 { |
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191 asm("push ebp"); |
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192 asm("push edi"); |
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193 asm("push esi"); |
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194 asm("mov eax, [esp+16]"); |
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195 asm("mov edx, [esp+20]"); |
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196 asm("mov esi, [esp+24]"); |
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197 asm("mov edi, [esp+28]"); |
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198 asm("test edx, edx"); |
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199 asm("jns alldrvm_dividend_nonnegative"); |
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200 asm("neg edx"); |
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201 asm("neg eax"); |
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202 asm("sbb edx, 0"); |
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203 asm("alldrvm_dividend_nonnegative:"); |
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204 asm("test edi, edi"); |
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205 asm("jns alldrvm_divisor_nonnegative"); |
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206 asm("neg edi"); |
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207 asm("neg esi"); |
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208 asm("sbb edi, 0"); |
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209 asm("alldrvm_divisor_nonnegative:"); |
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210 asm("call %a0": : "i"(&UDiv64)); |
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211 asm("mov ebp, [esp+20]"); |
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212 asm("mov ecx, edx"); |
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213 asm("xor ebp, [esp+28]"); |
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214 asm("mov edx, ebx"); |
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215 asm("mov ebx, edi"); |
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216 asm("jns alldrvm_quotient_nonnegative"); |
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217 asm("neg edx"); |
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218 asm("neg eax"); |
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219 asm("sbb edx, 0"); |
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220 asm("alldrvm_quotient_nonnegative:"); |
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221 asm("cmp dword ptr [esp+20], 0"); |
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222 asm("jns alldrvm_rem_nonnegative"); |
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223 asm("neg ebx"); |
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224 asm("neg ecx"); |
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225 asm("sbb ebx, 0"); |
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226 asm("alldrvm_rem_nonnegative:"); |
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227 asm("pop esi"); |
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228 asm("pop edi"); |
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229 asm("pop ebp"); |
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230 asm("ret"); |
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231 } |
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232 |
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233 //__NAKED__ void _aulldiv() |
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234 __NAKED__ void __udivdi3 () |
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235 // |
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236 // Divide two 64 bit unsigned integers returning a 64 bit result |
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237 // On entry: |
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238 // [esp+4], [esp+8] = dividend |
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239 // [esp+12], [esp+16] = divisor |
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240 // Return result in edx:eax |
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241 // Remove arguments from stack |
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242 // |
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243 { |
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244 asm("push ebp"); |
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245 asm("push edi"); |
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246 asm("push esi"); |
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247 asm("push ebx"); |
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248 asm("mov eax, [esp+20]"); |
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249 asm("mov edx, [esp+24]"); |
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250 asm("mov esi, [esp+28]"); |
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251 asm("mov edi, [esp+32]"); |
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252 asm("call %a0": : "i"(&UDiv64)); |
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253 asm("mov edx, ebx"); |
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254 asm("pop ebx"); |
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255 asm("pop esi"); |
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256 asm("pop edi"); |
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257 asm("pop ebp"); |
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258 asm("ret"); |
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259 } |
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260 |
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261 |
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262 __NAKED__ void __divdi3() |
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263 |
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264 // |
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265 // Divide two 64 bit signed integers returning a 64 bit result |
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266 // On entry: |
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267 // [esp+4], [esp+8] = dividend |
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268 // [esp+12], [esp+16] = divisor |
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269 // Return result in edx:eax |
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270 // Remove arguments from stack |
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271 // |
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272 { |
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273 asm("push ebp"); |
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274 asm("push edi"); |
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275 asm("push esi"); |
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276 asm("push ebx"); |
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277 asm("mov eax, [esp+20]"); |
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278 asm("mov edx, [esp+24]"); |
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279 asm("mov esi, [esp+28]"); |
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280 asm("mov edi, [esp+32]"); |
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281 asm("test edx, edx"); |
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282 asm("jns divdi_dividend_nonnegative"); |
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283 asm("neg edx"); |
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284 asm("neg eax"); |
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285 asm("sbb edx, 0"); |
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286 asm("divdi_dividend_nonnegative:"); |
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287 asm("test edi, edi"); |
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288 asm("jns divdi_divisor_nonnegative"); |
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289 asm("neg edi"); |
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290 asm("neg esi"); |
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291 asm("sbb edi, 0"); |
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292 asm("divdi_divisor_nonnegative:"); |
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293 asm("call %a0": : "i"(&UDiv64)); |
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294 asm("mov ecx, [esp+24]"); |
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295 asm("mov edx, ebx"); |
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296 asm("xor ecx, [esp+32]"); |
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297 asm("jns divdi_quotient_nonnegative"); |
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298 asm("neg edx"); |
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299 asm("neg eax"); |
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300 asm("sbb edx, 0"); |
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301 asm("divdi_quotient_nonnegative:"); |
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302 asm("pop ebx"); |
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303 asm("pop esi"); |
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304 asm("pop edi"); |
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305 asm("pop ebp"); |
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306 asm("ret"); |
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307 } |
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308 |
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309 __NAKED__ void __umoddi3() |
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310 // |
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311 // Divide two 64 bit unsigned integers and return 64 bit remainder |
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312 // On entry: |
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313 // [esp+4], [esp+8] = dividend |
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314 // [esp+12], [esp+16] = divisor |
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315 // Return result in edx:eax |
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316 // Remove arguments from stack |
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317 // |
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318 { |
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319 asm("push ebp"); |
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320 asm("push edi"); |
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321 asm("push esi"); |
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322 asm("push ebx"); |
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323 asm("mov eax, [esp+20]"); |
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324 asm("mov edx, [esp+24]"); |
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325 asm("mov esi, [esp+28]"); |
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326 asm("mov edi, [esp+32]"); |
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327 asm("call %a0": : "i"(&UDiv64)); |
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328 asm("mov eax, edx"); |
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329 asm("mov edx, edi"); |
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330 asm("pop ebx"); |
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331 asm("pop esi"); |
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332 asm("pop edi"); |
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333 asm("pop ebp"); |
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334 asm("ret"); |
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335 } |
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336 |
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337 __NAKED__ void __moddi3() |
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338 // |
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339 // Divide two 64 bit signed integers and return 64 bit remainder |
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340 // On entry: |
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341 // [esp+4], [esp+8] = dividend |
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342 // [esp+12], [esp+16] = divisor |
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343 // Return result in edx:eax |
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344 // Remove arguments from stack |
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345 // |
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346 { |
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347 asm("push ebp"); |
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348 asm("push edi"); |
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349 asm("push esi"); |
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350 asm("push ebx"); |
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351 asm("mov eax, [esp+20]"); |
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352 asm("mov edx, [esp+24]"); |
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353 asm("mov esi, [esp+28]"); |
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354 asm("mov edi, [esp+32]"); |
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355 asm("test edx, edx"); |
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356 asm("jns dividend_nonnegative"); |
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357 asm("neg edx"); |
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358 asm("neg eax"); |
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359 asm("sbb edx, 0"); |
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360 asm("dividend_nonnegative:"); |
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361 asm("test edi, edi"); |
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362 asm("jns divisor_nonnegative"); |
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363 asm("neg edi"); |
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364 asm("neg esi"); |
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365 asm("sbb edi, 0"); |
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366 asm("divisor_nonnegative:"); |
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367 asm("call %a0": : "i"(&UDiv64)); |
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368 asm("mov eax, edx"); |
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369 asm("mov edx, edi"); |
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370 asm("cmp dword ptr [esp+24], 0"); |
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371 asm("jns rem_nonnegative"); |
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372 asm("neg edx"); |
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373 asm("neg eax"); |
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374 asm("sbb edx, 0"); |
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375 asm("rem_nonnegative:"); |
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376 asm("pop ebx"); |
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377 asm("pop esi"); |
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378 asm("pop edi"); |
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379 asm("pop ebp"); |
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380 asm("ret"); |
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381 } |
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382 |
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383 __NAKED__ void _allshr() |
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384 // |
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385 // Arithmetic shift right EDX:EAX by CL |
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386 // |
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387 { |
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388 asm("cmp cl, 64"); |
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389 asm("jae asr_count_ge_64"); |
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390 asm("cmp cl, 32"); |
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391 asm("jae asr_count_ge_32"); |
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392 asm("shrd eax, edx, cl"); |
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393 asm("sar edx, cl"); |
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394 asm("ret"); |
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395 asm("asr_count_ge_32:"); |
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396 asm("sub cl, 32"); |
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397 asm("mov eax, edx"); |
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398 asm("cdq"); |
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399 asm("sar eax, cl"); |
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400 asm("ret"); |
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401 asm("asr_count_ge_64:"); |
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402 asm("sar edx, 32"); |
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403 asm("mov eax, edx"); |
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404 asm("ret"); |
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405 } |
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406 |
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407 __NAKED__ void _allshl() |
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408 // |
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409 // shift left EDX:EAX by CL |
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410 // |
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411 { |
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412 asm("cmp cl, 64"); |
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413 asm("jae lsl_count_ge_64"); |
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414 asm("cmp cl, 32"); |
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415 asm("jae lsl_count_ge_32"); |
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416 asm("shld edx, eax, cl"); |
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417 asm("shl eax, cl"); |
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418 asm("ret"); |
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419 asm("lsl_count_ge_32:"); |
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420 asm("sub cl, 32"); |
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421 asm("mov edx, eax"); |
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422 asm("xor eax, eax"); |
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423 asm("shl edx, cl"); |
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424 asm("ret"); |
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425 asm("lsl_count_ge_64:"); |
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426 asm("xor edx, edx"); |
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427 asm("xor eax, eax"); |
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428 asm("ret"); |
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429 } |
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430 |
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431 __NAKED__ void _aullshr() |
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432 // |
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433 // Logical shift right EDX:EAX by CL |
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434 // |
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435 { |
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436 asm("cmp cl, 64"); |
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437 asm("jae lsr_count_ge_64"); |
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438 asm("cmp cl, 32"); |
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439 asm("jae lsr_count_ge_32"); |
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440 asm("shrd eax, edx, cl"); |
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441 asm("shr edx, cl"); |
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442 asm("ret"); |
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443 asm("lsr_count_ge_32:"); |
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444 asm("sub cl, 32"); |
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445 asm("mov eax, edx"); |
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446 asm("xor edx, edx"); |
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447 asm("shr eax, cl"); |
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448 asm("ret"); |
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449 asm("lsr_count_ge_64:"); |
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450 asm("xor edx, edx"); |
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451 asm("xor eax, eax"); |
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452 asm("ret"); |
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453 } |
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454 |
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455 } |