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111
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1 /* -----------------------------------------------------------------------
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2 ffi.c - Copyright (c) 2011, 2013 Anthony Green
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3 Copyright (c) 1996, 2003-2004, 2007-2008 Red Hat, Inc.
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4
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5 SPARC Foreign Function Interface
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6
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7 Permission is hereby granted, free of charge, to any person obtaining
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8 a copy of this software and associated documentation files (the
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9 ``Software''), to deal in the Software without restriction, including
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10 without limitation the rights to use, copy, modify, merge, publish,
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11 distribute, sublicense, and/or sell copies of the Software, and to
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12 permit persons to whom the Software is furnished to do so, subject to
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13 the following conditions:
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14
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15 The above copyright notice and this permission notice shall be included
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16 in all copies or substantial portions of the Software.
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17
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18 THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
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19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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21 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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22 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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23 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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24 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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25 DEALINGS IN THE SOFTWARE.
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26 ----------------------------------------------------------------------- */
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27
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28 #include <ffi.h>
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29 #include <ffi_common.h>
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30 #include <stdlib.h>
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31 #include "internal.h"
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32
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33 /* Force FFI_TYPE_LONGDOUBLE to be different than FFI_TYPE_DOUBLE;
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34 all further uses in this file will refer to the 128-bit type. */
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35 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
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36 # if FFI_TYPE_LONGDOUBLE != 4
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37 # error FFI_TYPE_LONGDOUBLE out of date
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38 # endif
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39 #else
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40 # undef FFI_TYPE_LONGDOUBLE
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41 # define FFI_TYPE_LONGDOUBLE 4
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42 #endif
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43
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44 #ifdef SPARC64
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45
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46 /* Flatten the contents of a structure to the parts that are passed in
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47 floating point registers. The return is a bit mask wherein bit N
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48 set means bytes [4*n, 4*n+3] are passed in %fN.
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49
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50 We encode both the (running) size (maximum 32) and mask (maxumum 255)
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51 into one integer. The size is placed in the low byte, so that align
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52 and addition work correctly. The mask is placed in the second byte. */
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53
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54 static int
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55 ffi_struct_float_mask (ffi_type *outer_type, int size_mask)
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56 {
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57 ffi_type **elts;
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58 ffi_type *t;
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59
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60 if (outer_type->type == FFI_TYPE_COMPLEX)
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61 {
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62 int m = 0, tt = outer_type->elements[0]->type;
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63 size_t z = outer_type->size;
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64
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65 if (tt == FFI_TYPE_FLOAT
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66 || tt == FFI_TYPE_DOUBLE
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67 || tt == FFI_TYPE_LONGDOUBLE)
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68 m = (1 << (z / 4)) - 1;
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69 return (m << 8) | z;
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70 }
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71 FFI_ASSERT (outer_type->type == FFI_TYPE_STRUCT);
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72
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73 for (elts = outer_type->elements; (t = *elts) != NULL; elts++)
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74 {
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75 size_t z = t->size;
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76 int o, m, tt;
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77
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78 size_mask = ALIGN(size_mask, t->alignment);
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79 switch (t->type)
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80 {
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81 case FFI_TYPE_STRUCT:
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82 size_mask = ffi_struct_float_mask (t, size_mask);
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83 continue;
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84 case FFI_TYPE_COMPLEX:
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85 tt = t->elements[0]->type;
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86 if (tt != FFI_TYPE_FLOAT
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87 && tt != FFI_TYPE_DOUBLE
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88 && tt != FFI_TYPE_LONGDOUBLE)
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89 break;
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90 /* FALLTHRU */
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91 case FFI_TYPE_FLOAT:
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92 case FFI_TYPE_DOUBLE:
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93 case FFI_TYPE_LONGDOUBLE:
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94 m = (1 << (z / 4)) - 1; /* compute mask for type */
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95 o = (size_mask >> 2) & 0x3f; /* extract word offset */
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96 size_mask |= m << (o + 8); /* insert mask into place */
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97 break;
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98 }
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99 size_mask += z;
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100 }
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101
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102 size_mask = ALIGN(size_mask, outer_type->alignment);
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103 FFI_ASSERT ((size_mask & 0xff) == outer_type->size);
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104
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105 return size_mask;
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106 }
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107
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108 /* Merge floating point data into integer data. If the structure is
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109 entirely floating point, simply return a pointer to the fp data. */
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110
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111 static void *
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112 ffi_struct_float_merge (int size_mask, void *vi, void *vf)
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113 {
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114 int size = size_mask & 0xff;
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115 int mask = size_mask >> 8;
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116 int n = size >> 2;
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117
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118 if (mask == 0)
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119 return vi;
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120 else if (mask == (1 << n) - 1)
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121 return vf;
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122 else
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123 {
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124 unsigned int *wi = vi, *wf = vf;
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125 int i;
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126
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127 for (i = 0; i < n; ++i)
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128 if ((mask >> i) & 1)
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129 wi[i] = wf[i];
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130
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131 return vi;
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132 }
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133 }
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134
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135 /* Similar, but place the data into VD in the end. */
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136
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137 void FFI_HIDDEN
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138 ffi_struct_float_copy (int size_mask, void *vd, void *vi, void *vf)
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139 {
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140 int size = size_mask & 0xff;
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141 int mask = size_mask >> 8;
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142 int n = size >> 2;
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143
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144 if (mask == 0)
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145 ;
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146 else if (mask == (1 << n) - 1)
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147 vi = vf;
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148 else
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149 {
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150 unsigned int *wd = vd, *wi = vi, *wf = vf;
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151 int i;
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152
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153 for (i = 0; i < n; ++i)
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154 wd[i] = ((mask >> i) & 1 ? wf : wi)[i];
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155 return;
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156 }
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157 memcpy (vd, vi, size);
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158 }
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159
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160 /* Perform machine dependent cif processing */
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161
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162 static ffi_status
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163 ffi_prep_cif_machdep_core(ffi_cif *cif)
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164 {
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165 ffi_type *rtype = cif->rtype;
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166 int rtt = rtype->type;
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167 size_t bytes = 0;
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168 int i, n, flags;
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169
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170 /* Set the return type flag */
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171 switch (rtt)
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172 {
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173 case FFI_TYPE_VOID:
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174 flags = SPARC_RET_VOID;
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175 break;
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176 case FFI_TYPE_FLOAT:
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177 flags = SPARC_RET_F_1;
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178 break;
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179 case FFI_TYPE_DOUBLE:
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180 flags = SPARC_RET_F_2;
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181 break;
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182 case FFI_TYPE_LONGDOUBLE:
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183 flags = SPARC_RET_F_4;
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184 break;
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185
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186 case FFI_TYPE_COMPLEX:
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187 case FFI_TYPE_STRUCT:
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188 if (rtype->size > 32)
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189 {
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190 flags = SPARC_RET_VOID | SPARC_FLAG_RET_IN_MEM;
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191 bytes = 8;
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192 }
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193 else
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194 {
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195 int size_mask = ffi_struct_float_mask (rtype, 0);
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196 int word_size = (size_mask >> 2) & 0x3f;
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197 int all_mask = (1 << word_size) - 1;
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198 int fp_mask = size_mask >> 8;
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199
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200 flags = (size_mask << SPARC_SIZEMASK_SHIFT) | SPARC_RET_STRUCT;
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201
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202 /* For special cases of all-int or all-fp, we can return
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203 the value directly without popping through a struct copy. */
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204 if (fp_mask == 0)
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205 {
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206 if (rtype->alignment >= 8)
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207 {
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208 if (rtype->size == 8)
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209 flags = SPARC_RET_INT64;
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210 else if (rtype->size == 16)
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211 flags = SPARC_RET_INT128;
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212 }
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213 }
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214 else if (fp_mask == all_mask)
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215 switch (word_size)
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216 {
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217 case 1: flags = SPARC_RET_F_1; break;
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218 case 2: flags = SPARC_RET_F_2; break;
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219 case 3: flags = SP_V9_RET_F_3; break;
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220 case 4: flags = SPARC_RET_F_4; break;
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221 /* 5 word structures skipped; handled via RET_STRUCT. */
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222 case 6: flags = SPARC_RET_F_6; break;
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223 /* 7 word structures skipped; handled via RET_STRUCT. */
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224 case 8: flags = SPARC_RET_F_8; break;
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225 }
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226 }
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227 break;
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228
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229 case FFI_TYPE_SINT8:
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230 flags = SPARC_RET_SINT8;
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231 break;
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232 case FFI_TYPE_UINT8:
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233 flags = SPARC_RET_UINT8;
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234 break;
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235 case FFI_TYPE_SINT16:
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236 flags = SPARC_RET_SINT16;
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237 break;
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238 case FFI_TYPE_UINT16:
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239 flags = SPARC_RET_UINT16;
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240 break;
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241 case FFI_TYPE_INT:
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242 case FFI_TYPE_SINT32:
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243 flags = SP_V9_RET_SINT32;
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244 break;
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245 case FFI_TYPE_UINT32:
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246 flags = SPARC_RET_UINT32;
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247 break;
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248 case FFI_TYPE_SINT64:
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249 case FFI_TYPE_UINT64:
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250 case FFI_TYPE_POINTER:
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251 flags = SPARC_RET_INT64;
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252 break;
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253
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254 default:
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255 abort();
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256 }
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257
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258 bytes = 0;
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259 for (i = 0, n = cif->nargs; i < n; ++i)
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260 {
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261 ffi_type *ty = cif->arg_types[i];
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262 size_t z = ty->size;
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263 size_t a = ty->alignment;
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264
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265 switch (ty->type)
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266 {
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267 case FFI_TYPE_COMPLEX:
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268 case FFI_TYPE_STRUCT:
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269 /* Large structs passed by reference. */
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270 if (z > 16)
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271 {
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272 a = z = 8;
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273 break;
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274 }
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275 /* Small structs may be passed in integer or fp regs or both. */
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276 if (bytes >= 16*8)
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277 break;
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278 if ((ffi_struct_float_mask (ty, 0) & 0xff00) == 0)
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279 break;
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280 /* FALLTHRU */
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281 case FFI_TYPE_FLOAT:
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282 case FFI_TYPE_DOUBLE:
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283 case FFI_TYPE_LONGDOUBLE:
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284 flags |= SPARC_FLAG_FP_ARGS;
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285 break;
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286 }
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287 bytes = ALIGN(bytes, a);
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288 bytes += ALIGN(z, 8);
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289 }
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290
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291 /* Sparc call frames require that space is allocated for 6 args,
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292 even if they aren't used. Make that space if necessary. */
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293 if (bytes < 6 * 8)
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294 bytes = 6 * 8;
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295
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296 /* The stack must be 2 word aligned, so round bytes up appropriately. */
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297 bytes = ALIGN(bytes, 16);
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298
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299 /* Include the call frame to prep_args. */
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300 bytes += 8*16 + 8*8;
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301
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302 cif->bytes = bytes;
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303 cif->flags = flags;
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304 return FFI_OK;
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305 }
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306
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307 ffi_status FFI_HIDDEN
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308 ffi_prep_cif_machdep(ffi_cif *cif)
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309 {
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310 cif->nfixedargs = cif->nargs;
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311 return ffi_prep_cif_machdep_core(cif);
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312 }
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313
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314 ffi_status FFI_HIDDEN
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315 ffi_prep_cif_machdep_var(ffi_cif *cif, unsigned nfixedargs, unsigned ntotalargs)
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316 {
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317 cif->nfixedargs = nfixedargs;
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318 return ffi_prep_cif_machdep_core(cif);
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319 }
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320
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321 extern void ffi_call_v9(ffi_cif *cif, void (*fn)(void), void *rvalue,
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322 void **avalue, size_t bytes, void *closure) FFI_HIDDEN;
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323
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324 /* ffi_prep_args is called by the assembly routine once stack space
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325 has been allocated for the function's arguments */
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326
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327 int FFI_HIDDEN
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328 ffi_prep_args_v9(ffi_cif *cif, unsigned long *argp, void *rvalue, void **avalue)
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329 {
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330 ffi_type **p_arg;
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331 int flags = cif->flags;
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332 int i, nargs;
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333
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334 if (rvalue == NULL)
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335 {
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336 if (flags & SPARC_FLAG_RET_IN_MEM)
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337 {
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338 /* Since we pass the pointer to the callee, we need a value.
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339 We allowed for this space in ffi_call, before ffi_call_v8
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340 alloca'd the space. */
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341 rvalue = (char *)argp + cif->bytes;
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342 }
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343 else
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344 {
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345 /* Otherwise, we can ignore the return value. */
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346 flags = SPARC_RET_VOID;
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347 }
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348 }
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349
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350 #ifdef USING_PURIFY
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351 /* Purify will probably complain in our assembly routine,
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352 unless we zero out this memory. */
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353 memset(argp, 0, 6*8);
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354 #endif
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355
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356 if (flags & SPARC_FLAG_RET_IN_MEM)
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357 *argp++ = (unsigned long)rvalue;
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358
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359 p_arg = cif->arg_types;
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360 for (i = 0, nargs = cif->nargs; i < nargs; i++)
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361 {
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362 ffi_type *ty = p_arg[i];
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363 void *a = avalue[i];
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364 size_t z;
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365
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366 switch (ty->type)
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367 {
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368 case FFI_TYPE_SINT8:
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369 *argp++ = *(SINT8 *)a;
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370 break;
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371 case FFI_TYPE_UINT8:
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372 *argp++ = *(UINT8 *)a;
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373 break;
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374 case FFI_TYPE_SINT16:
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375 *argp++ = *(SINT16 *)a;
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376 break;
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377 case FFI_TYPE_UINT16:
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378 *argp++ = *(UINT16 *)a;
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379 break;
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380 case FFI_TYPE_INT:
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381 case FFI_TYPE_SINT32:
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382 *argp++ = *(SINT32 *)a;
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383 break;
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384 case FFI_TYPE_UINT32:
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385 case FFI_TYPE_FLOAT:
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386 *argp++ = *(UINT32 *)a;
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387 break;
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388 case FFI_TYPE_SINT64:
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389 case FFI_TYPE_UINT64:
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390 case FFI_TYPE_POINTER:
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391 case FFI_TYPE_DOUBLE:
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392 *argp++ = *(UINT64 *)a;
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393 break;
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394
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395 case FFI_TYPE_LONGDOUBLE:
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396 case FFI_TYPE_COMPLEX:
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397 case FFI_TYPE_STRUCT:
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398 z = ty->size;
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399 if (z > 16)
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400 {
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401 /* For structures larger than 16 bytes we pass reference. */
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402 *argp++ = (unsigned long)a;
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403 break;
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404 }
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405 if (((unsigned long)argp & 15) && ty->alignment > 8)
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406 argp++;
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407 memcpy(argp, a, z);
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408 argp += ALIGN(z, 8) / 8;
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409 break;
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410
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411 default:
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412 abort();
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413 }
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414 }
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415
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416 return flags;
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417 }
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|
|
418
|
|
|
419 static void
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|
|
420 ffi_call_int(ffi_cif *cif, void (*fn)(void), void *rvalue,
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|
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421 void **avalue, void *closure)
|
|
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422 {
|
|
|
423 size_t bytes = cif->bytes;
|
|
|
424
|
|
|
425 FFI_ASSERT (cif->abi == FFI_V9);
|
|
|
426
|
|
|
427 if (rvalue == NULL && (cif->flags & SPARC_FLAG_RET_IN_MEM))
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|
|
428 bytes += ALIGN (cif->rtype->size, 16);
|
|
|
429
|
|
|
430 ffi_call_v9(cif, fn, rvalue, avalue, -bytes, closure);
|
|
|
431 }
|
|
|
432
|
|
|
433 void
|
|
|
434 ffi_call(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue)
|
|
|
435 {
|
|
|
436 ffi_call_int(cif, fn, rvalue, avalue, NULL);
|
|
|
437 }
|
|
|
438
|
|
|
439 void
|
|
|
440 ffi_call_go(ffi_cif *cif, void (*fn)(void), void *rvalue,
|
|
|
441 void **avalue, void *closure)
|
|
|
442 {
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|
|
443 ffi_call_int(cif, fn, rvalue, avalue, closure);
|
|
|
444 }
|
|
|
445
|
|
|
446 #ifdef __GNUC__
|
|
|
447 static inline void
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|
|
448 ffi_flush_icache (void *p)
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|
|
449 {
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|
|
450 asm volatile ("flush %0; flush %0+8" : : "r" (p) : "memory");
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|
|
451 }
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|
|
452 #else
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|
|
453 extern void ffi_flush_icache (void *) FFI_HIDDEN;
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|
|
454 #endif
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|
|
455
|
|
|
456 extern void ffi_closure_v9(void) FFI_HIDDEN;
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|
|
457 extern void ffi_go_closure_v9(void) FFI_HIDDEN;
|
|
|
458
|
|
|
459 ffi_status
|
|
|
460 ffi_prep_closure_loc (ffi_closure* closure,
|
|
|
461 ffi_cif* cif,
|
|
|
462 void (*fun)(ffi_cif*, void*, void**, void*),
|
|
|
463 void *user_data,
|
|
|
464 void *codeloc)
|
|
|
465 {
|
|
|
466 unsigned int *tramp = (unsigned int *) &closure->tramp[0];
|
|
|
467 unsigned long fn;
|
|
|
468
|
|
|
469 if (cif->abi != FFI_V9)
|
|
|
470 return FFI_BAD_ABI;
|
|
|
471
|
|
|
472 /* Trampoline address is equal to the closure address. We take advantage
|
|
|
473 of that to reduce the trampoline size by 8 bytes. */
|
|
|
474 fn = (unsigned long) ffi_closure_v9;
|
|
|
475 tramp[0] = 0x83414000; /* rd %pc, %g1 */
|
|
|
476 tramp[1] = 0xca586010; /* ldx [%g1+16], %g5 */
|
|
|
477 tramp[2] = 0x81c14000; /* jmp %g5 */
|
|
|
478 tramp[3] = 0x01000000; /* nop */
|
|
|
479 *((unsigned long *) &tramp[4]) = fn;
|
|
|
480
|
|
|
481 closure->cif = cif;
|
|
|
482 closure->fun = fun;
|
|
|
483 closure->user_data = user_data;
|
|
|
484
|
|
|
485 ffi_flush_icache (closure);
|
|
|
486
|
|
|
487 return FFI_OK;
|
|
|
488 }
|
|
|
489
|
|
|
490 ffi_status
|
|
|
491 ffi_prep_go_closure (ffi_go_closure* closure, ffi_cif* cif,
|
|
|
492 void (*fun)(ffi_cif*, void*, void**, void*))
|
|
|
493 {
|
|
|
494 if (cif->abi != FFI_V9)
|
|
|
495 return FFI_BAD_ABI;
|
|
|
496
|
|
|
497 closure->tramp = ffi_go_closure_v9;
|
|
|
498 closure->cif = cif;
|
|
|
499 closure->fun = fun;
|
|
|
500
|
|
|
501 return FFI_OK;
|
|
|
502 }
|
|
|
503
|
|
|
504 int FFI_HIDDEN
|
|
|
505 ffi_closure_sparc_inner_v9(ffi_cif *cif,
|
|
|
506 void (*fun)(ffi_cif*, void*, void**, void*),
|
|
|
507 void *user_data, void *rvalue,
|
|
|
508 unsigned long *gpr, unsigned long *fpr)
|
|
|
509 {
|
|
|
510 ffi_type **arg_types;
|
|
|
511 void **avalue;
|
|
|
512 int i, argn, argx, nargs, flags, nfixedargs;
|
|
|
513
|
|
|
514 arg_types = cif->arg_types;
|
|
|
515 nargs = cif->nargs;
|
|
|
516 flags = cif->flags;
|
|
|
517 nfixedargs = cif->nfixedargs;
|
|
|
518
|
|
|
519 avalue = alloca(nargs * sizeof(void *));
|
|
|
520
|
|
|
521 /* Copy the caller's structure return address so that the closure
|
|
|
522 returns the data directly to the caller. */
|
|
|
523 if (flags & SPARC_FLAG_RET_IN_MEM)
|
|
|
524 {
|
|
|
525 rvalue = (void *) gpr[0];
|
|
|
526 /* Skip the structure return address. */
|
|
|
527 argn = 1;
|
|
|
528 }
|
|
|
529 else
|
|
|
530 argn = 0;
|
|
|
531
|
|
|
532 /* Grab the addresses of the arguments from the stack frame. */
|
|
|
533 for (i = 0; i < nargs; i++, argn = argx)
|
|
|
534 {
|
|
|
535 int named = i < nfixedargs;
|
|
|
536 ffi_type *ty = arg_types[i];
|
|
|
537 void *a = &gpr[argn];
|
|
|
538 size_t z;
|
|
|
539
|
|
|
540 argx = argn + 1;
|
|
|
541 switch (ty->type)
|
|
|
542 {
|
|
|
543 case FFI_TYPE_COMPLEX:
|
|
|
544 case FFI_TYPE_STRUCT:
|
|
|
545 z = ty->size;
|
|
|
546 if (z > 16)
|
|
|
547 a = *(void **)a;
|
|
|
548 else
|
|
|
549 {
|
|
|
550 argx = argn + ALIGN (z, 8) / 8;
|
|
|
551 if (named && argn < 16)
|
|
|
552 {
|
|
|
553 int size_mask = ffi_struct_float_mask (ty, 0);
|
|
|
554 int argn_mask = (0xffff00 >> argn) & 0xff00;
|
|
|
555
|
|
|
556 /* Eliminate fp registers off the end. */
|
|
|
557 size_mask = (size_mask & 0xff) | (size_mask & argn_mask);
|
|
|
558 a = ffi_struct_float_merge (size_mask, gpr+argn, fpr+argn);
|
|
|
559 }
|
|
|
560 }
|
|
|
561 break;
|
|
|
562
|
|
|
563 case FFI_TYPE_LONGDOUBLE:
|
|
|
564 argn = ALIGN (argn, 2);
|
|
|
565 a = (named && argn < 16 ? fpr : gpr) + argn;
|
|
|
566 argx = argn + 2;
|
|
|
567 break;
|
|
|
568 case FFI_TYPE_DOUBLE:
|
|
|
569 if (named && argn < 16)
|
|
|
570 a = fpr + argn;
|
|
|
571 break;
|
|
|
572 case FFI_TYPE_FLOAT:
|
|
|
573 if (named && argn < 16)
|
|
|
574 a = fpr + argn;
|
|
|
575 a += 4;
|
|
|
576 break;
|
|
|
577
|
|
|
578 case FFI_TYPE_UINT64:
|
|
|
579 case FFI_TYPE_SINT64:
|
|
|
580 case FFI_TYPE_POINTER:
|
|
|
581 break;
|
|
|
582 case FFI_TYPE_INT:
|
|
|
583 case FFI_TYPE_UINT32:
|
|
|
584 case FFI_TYPE_SINT32:
|
|
|
585 a += 4;
|
|
|
586 break;
|
|
|
587 case FFI_TYPE_UINT16:
|
|
|
588 case FFI_TYPE_SINT16:
|
|
|
589 a += 6;
|
|
|
590 break;
|
|
|
591 case FFI_TYPE_UINT8:
|
|
|
592 case FFI_TYPE_SINT8:
|
|
|
593 a += 7;
|
|
|
594 break;
|
|
|
595
|
|
|
596 default:
|
|
|
597 abort();
|
|
|
598 }
|
|
|
599 avalue[i] = a;
|
|
|
600 }
|
|
|
601
|
|
|
602 /* Invoke the closure. */
|
|
|
603 fun (cif, rvalue, avalue, user_data);
|
|
|
604
|
|
|
605 /* Tell ffi_closure_sparc how to perform return type promotions. */
|
|
|
606 return flags;
|
|
|
607 }
|
|
|
608 #endif /* SPARC64 */
|
