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 | 8 | 9 | *
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12 | * ------------------------------------------------------------- *
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13 | * | 0 | 4 | 8 | 12 | 16 | 20 | 24 | 28 | 32 | 36 | *
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14 | * ------------------------------------------------------------- *
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15 | PPC64 Big-Endian:
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16 | * | R13 | R14 | R15 | R16 | R17 | *
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17 | PPC64 Little-Endian:
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18 | * | TOC | R14 | R15 | R16 | R17 | *
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19 | * ------------------------------------------------------------- *
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37 | * | 120 | 124 | 128 | 132 | 136 | 140 | 144 | 148 | 152 | 156 | *
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38 | * ------------------------------------------------------------- *
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39 | * | R28 | R29 | R30 | R31 | SP | *
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42 | * | 40 | 41 | 42 | 43 | 44 | 45 | | *
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45 | * ------------------------------------------------------------- *
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46 | * | CR | LR | PC | | *
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52 | * ------------------------------------------------------------- *
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53 | * | sp | size | | *
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59 | * ------------------------------------------------------------- *
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60 | * | F14 | F15 | F16 | F17 | F18 | *
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68 | * ------------------------------------------------------------- *
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72 | * | 280 | 284 | 288 | 292 | 296 | 300 | 304 | 308 | 312 | 316 | *
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73 | * ------------------------------------------------------------- *
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74 | PPC64 Big-Endian:
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75 | * | F24 | F25 | F26 | F27 | F28 | *
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76 | * ------------------------------------------------------------- *
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77 | * ------------------------------------------------------------- *
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78 | * | 80 | 81 | 82 | 83 | 84 | 85 | 86 | 87 | | *
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79 | * ------------------------------------------------------------- *
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80 | * | 320 | 324 | 328 | 332 | 336 | 340 | 344 | 348 | | *
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81 | * ------------------------------------------------------------- *
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82 | * | F29 | F30 | F31 | fpscr | | *
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83 | * ------------------------------------------------------------- *
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84 | PPC64 Big-Endian:
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85 | * *
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86 | * *****************************************************************/
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87 |
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88 | #ifdef __LITTLE_ENDIAN__
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89 | .abiversion 2
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90 | #endif
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91 |
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92 | .section ".text"
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93 | .align 2
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94 | .globl make_fcontext
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95 |
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96 | #ifdef __BIG_ENDIAN__
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97 | .section ".opd","aw"
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98 | .align 3
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99 | #else
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100 | .type make_fcontext,@function
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101 | #endif
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102 |
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103 | make_fcontext:
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104 | #ifdef __BIG_ENDIAN__
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105 | .quad .make_fcontext,.TOC.@tocbase,0
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106 | .previous
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107 | .size make_fcontext,24
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108 | .type .make_fcontext,@function
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109 | .globl .make_fcontext
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110 | .make_fcontext:
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111 | #else
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112 | addis %r2,%r12,.TOC.-make_fcontext@ha
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113 | addi %r2,%r2,.TOC.-make_fcontext@l
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114 | .localentry make_fcontext,.-make_fcontext
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115 | #endif
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116 |
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117 | mflr %r6 # save return address into R6
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118 |
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119 | mr %r0, %r3
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120 | subi %r3, %r3, 352 # reserve space for fcontext_t at top of context stack
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121 |
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122 | # call align_stack, R3 contains address at 16 byte boundary after return
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123 | # == pointer to fcontext_t and address of context stack
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124 | clrrdi %r3, %r3, 4
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125 |
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126 | std %r0, 184(%r3) # save address of context stack (base) in fcontext_t
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127 | std %r4, 192(%r3) # save context stack size in fcontext_t
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128 |
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129 | #ifdef __BIG_ENDIAN__
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130 | ld %r4, 0(%r5) # save address of context function in fcontext_t
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131 | std %r4, 176(%r3)
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132 | #else
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133 | std %r5, 176(%r3) # save entry point of context function in fcontext_t
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134 | #endif
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135 |
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136 | subi %r0, %r3, 64 # 64 bytes on stack for parameter area (== 8 registers)
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137 | std %r0, 152(%r3) # save the stack base
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138 |
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139 | mflr %r0 # load LR
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140 | bl 1f # jump to label 1
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141 | 1:
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142 | mflr %r4 # load LR into R4
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143 | addi %r4, %r4, finish - 1b # compute abs address of label finish
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144 | mtlr %r0 # restore LR
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145 | std %r4, 168(%r3) # save address of finish as return address for context function
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146 | # entered after context function returns
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147 |
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148 | mtlr %r6 # restore return address from R6
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149 |
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150 | blr
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151 |
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152 | finish:
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153 | # SP points to same address as SP on entry of context function
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154 | mflr %r0 # save return address into R0
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155 | stw %r0, 8(%r1) # save return address on stack, set up stack frame
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156 | stwu %r1, -32(%r1) # allocate stack space, SP % 16 == 0
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157 |
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158 | li %r3, 0 # set return value to zero
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159 | bl _exit # exit application
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160 | nop
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161 | #ifdef __BIG_ENDIAN__
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162 | .size .make_fcontext, .-.make_fcontext
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163 | #else
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164 | .size make_fcontext,.-make_fcontext
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165 | #endif
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166 |
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167 | /* Mark that we don't need executable stack. */
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168 | .section .note.GNU-stack,"",%progbits
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