1 | /*
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2 | Copyright Oliver Kowalke 2009.
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3 | Distributed under the Boost Software License, Version 1.0.
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4 | (See accompanying file LICENSE_1_0.txt or copy at
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5 | http://www.boost.org/LICENSE_1_0.txt)
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6 | */
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7 |
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8 | /*******************************************************
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9 | * *
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10 | * ------------------------------------------------- *
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11 | * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | *
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12 | * ------------------------------------------------- *
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13 | * | 0 | 4 | 8 | 12 | 16 | 20 | 24 | 28 | *
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41 | * | 128 | 132 | 136 | 140 | 144 | 148 | 152 | 156 | *
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42 | * ------------------------------------------------- *
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43 | * | F30 | F31 | fpscr | TOC | *
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44 | * ------------------------------------------------- *
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46 | * | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | *
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48 | * | 160 | 164 | 168 | 172 | 176 | 180 | 184 | 188 | *
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49 | * ------------------------------------------------- *
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50 | * | R14 | R15 | R16 | R17 | *
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64 | * | R22 | R23 | R24 | R25 | *
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71 | * | R26 | R27 | R28 | R29 | *
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77 | * ------------------------------------------------- *
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78 | * ------------------------------------------------- *
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79 | * | R30 | R31 | CR | LR | *
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80 | * ------------------------------------------------- *
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81 | * ------------------------------------------------- *
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82 | * | 80 | 81 | | *
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83 | * ------------------------------------------------- *
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84 | * | 320 | 324 | | *
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85 | * ------------------------------------------------- *
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86 | * | PC | | *
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87 | * ------------------------------------------------- *
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88 | * *
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89 | *******************************************************/
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90 |
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91 | .globl make_fcontext
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92 | #if _CALL_ELF == 2
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93 | .text
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94 | .align 2
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95 | make_fcontext:
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96 | addis %r2, %r12, .TOC.-make_fcontext@ha
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97 | addi %r2, %r2, .TOC.-make_fcontext@l
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98 | .localentry make_fcontext, . - make_fcontext
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99 | #else
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100 | .section ".opd","aw"
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101 | .align 3
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102 | make_fcontext:
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103 | # ifdef _CALL_LINUX
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104 | .quad .L.make_fcontext,.TOC.@tocbase,0
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105 | .type make_fcontext,@function
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106 | .text
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107 | .align 2
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108 | .L.make_fcontext:
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109 | # else
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110 | .hidden .make_fcontext
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111 | .globl .make_fcontext
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112 | .quad .make_fcontext,.TOC.@tocbase,0
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113 | .size make_fcontext,24
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114 | .type .make_fcontext,@function
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115 | .text
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116 | .align 2
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117 | .make_fcontext:
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118 | # endif
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119 | #endif
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120 | # save return address into R6
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121 | mflr %r6
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122 |
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123 | # first arg of make_fcontext() == top address of context-stack
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124 | # shift address in R3 to lower 16 byte boundary
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125 | clrrdi %r3, %r3, 4
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126 |
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127 | # reserve space for context-data on context-stack
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128 | # including 64 byte of linkage + parameter area (R1 % 16 == 0)
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129 | subi %r3, %r3, 392
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130 |
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131 | # third arg of make_fcontext() == address of context-function
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132 | # entry point (ELFv2) or descriptor (ELFv1)
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133 | #if _CALL_ELF == 2
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134 | # save address of context-function entry point
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135 | std %r5, 320(%r3)
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136 | #else
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137 | # save address of context-function entry point
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138 | ld %r4, 0(%r5)
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139 | std %r4, 320(%r3)
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140 | # save TOC of context-function
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141 | ld %r4, 8(%r5)
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142 | std %r4, 152(%r3)
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143 | #endif
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144 |
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145 | # load LR
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146 | mflr %r0
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147 | # jump to label 1
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148 | bl 1f
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149 | 1:
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150 | # load LR into R4
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151 | mflr %r4
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152 | # compute abs address of label finish
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153 | addi %r4, %r4, finish - 1b
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154 | # restore LR
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155 | mtlr %r0
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156 | # save address of finish as return-address for context-function
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157 | # will be entered after context-function returns
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158 | std %r4, 312(%r3)
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159 |
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160 | # restore return address from R6
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161 | mtlr %r6
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162 |
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163 | blr # return pointer to context-data
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164 |
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165 | finish:
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166 | # save return address into R0
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167 | mflr %r0
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168 | # save return address on stack, set up stack frame
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169 | std %r0, 8(%r1)
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170 | # allocate stack space, R1 % 16 == 0
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171 | stdu %r1, -32(%r1)
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172 |
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173 | # exit code is zero
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174 | li %r3, 0
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175 | # exit application
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176 | bl _exit
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177 | nop
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178 | #if _CALL_ELF == 2
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179 | .size make_fcontext, .-make_fcontext
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180 | #else
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181 | # ifdef _CALL_LINUX
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182 | .size .make_fcontext, .-.L.make_fcontext
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183 | # else
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184 | .size .make_fcontext, .-.make_fcontext
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185 | # endif
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186 | #endif
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187 |
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188 | /* Mark that we don't need executable stack. */
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189 | .section .note.GNU-stack,"",%progbits
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