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111
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1 /* -----------------------------------------------------------------------
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2 ffi.c - Copyright (c) 2012 Anthony Green
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3 Copyright (c) 1998, 2001, 2007, 2008 Red Hat, Inc.
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4
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5 Alpha 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 defined(__LONG_DOUBLE_128__)
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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 extern void ffi_call_osf(void *stack, void *frame, unsigned flags,
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45 void *raddr, void (*fn)(void), void *closure)
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46 FFI_HIDDEN;
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47 extern void ffi_closure_osf(void) FFI_HIDDEN;
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48 extern void ffi_go_closure_osf(void) FFI_HIDDEN;
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49
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50 /* Promote a float value to its in-register double representation.
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51 Unlike actually casting to double, this does not trap on NaN. */
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52 static inline UINT64 lds(void *ptr)
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53 {
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54 UINT64 ret;
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55 asm("lds %0,%1" : "=f"(ret) : "m"(*(UINT32 *)ptr));
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56 return ret;
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57 }
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58
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59 /* And the reverse. */
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60 static inline void sts(void *ptr, UINT64 val)
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61 {
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62 asm("sts %1,%0" : "=m"(*(UINT32 *)ptr) : "f"(val));
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63 }
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64
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65 ffi_status FFI_HIDDEN
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66 ffi_prep_cif_machdep(ffi_cif *cif)
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67 {
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68 size_t bytes = 0;
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69 int flags, i, avn;
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70 ffi_type *rtype, *itype;
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71
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72 if (cif->abi != FFI_OSF)
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73 return FFI_BAD_ABI;
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74
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75 /* Compute the size of the argument area. */
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76 for (i = 0, avn = cif->nargs; i < avn; i++)
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77 {
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78 itype = cif->arg_types[i];
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79 switch (itype->type)
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80 {
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81 case FFI_TYPE_INT:
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82 case FFI_TYPE_SINT8:
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83 case FFI_TYPE_UINT8:
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84 case FFI_TYPE_SINT16:
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85 case FFI_TYPE_UINT16:
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86 case FFI_TYPE_SINT32:
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87 case FFI_TYPE_UINT32:
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88 case FFI_TYPE_SINT64:
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89 case FFI_TYPE_UINT64:
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90 case FFI_TYPE_POINTER:
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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 /* All take one 8 byte slot. */
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95 bytes += 8;
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96 break;
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97
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98 case FFI_TYPE_VOID:
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99 case FFI_TYPE_STRUCT:
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100 /* Passed by value in N slots. */
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101 bytes += ALIGN(itype->size, FFI_SIZEOF_ARG);
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102 break;
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103
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104 case FFI_TYPE_COMPLEX:
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105 /* _Complex long double passed by reference; others in 2 slots. */
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106 if (itype->elements[0]->type == FFI_TYPE_LONGDOUBLE)
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107 bytes += 8;
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108 else
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109 bytes += 16;
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110 break;
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111
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112 default:
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113 abort();
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114 }
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115 }
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116
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117 /* Set the return type flag */
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118 rtype = cif->rtype;
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119 switch (rtype->type)
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120 {
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121 case FFI_TYPE_VOID:
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122 flags = ALPHA_FLAGS(ALPHA_ST_VOID, ALPHA_LD_VOID);
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123 break;
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124 case FFI_TYPE_INT:
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125 case FFI_TYPE_UINT32:
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126 case FFI_TYPE_SINT32:
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127 flags = ALPHA_FLAGS(ALPHA_ST_INT, ALPHA_LD_INT32);
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128 break;
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129 case FFI_TYPE_FLOAT:
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130 flags = ALPHA_FLAGS(ALPHA_ST_FLOAT, ALPHA_LD_FLOAT);
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131 break;
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132 case FFI_TYPE_DOUBLE:
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133 flags = ALPHA_FLAGS(ALPHA_ST_DOUBLE, ALPHA_LD_DOUBLE);
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134 break;
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135 case FFI_TYPE_UINT8:
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136 flags = ALPHA_FLAGS(ALPHA_ST_INT, ALPHA_LD_UINT8);
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137 break;
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138 case FFI_TYPE_SINT8:
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139 flags = ALPHA_FLAGS(ALPHA_ST_INT, ALPHA_LD_SINT8);
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140 break;
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141 case FFI_TYPE_UINT16:
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142 flags = ALPHA_FLAGS(ALPHA_ST_INT, ALPHA_LD_UINT16);
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143 break;
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144 case FFI_TYPE_SINT16:
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145 flags = ALPHA_FLAGS(ALPHA_ST_INT, ALPHA_LD_SINT16);
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146 break;
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147 case FFI_TYPE_UINT64:
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148 case FFI_TYPE_SINT64:
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149 case FFI_TYPE_POINTER:
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150 flags = ALPHA_FLAGS(ALPHA_ST_INT, ALPHA_LD_INT64);
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151 break;
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152 case FFI_TYPE_LONGDOUBLE:
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153 case FFI_TYPE_STRUCT:
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154 /* Passed in memory, with a hidden pointer. */
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155 flags = ALPHA_RET_IN_MEM;
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156 break;
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157 case FFI_TYPE_COMPLEX:
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158 itype = rtype->elements[0];
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159 switch (itype->type)
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160 {
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161 case FFI_TYPE_FLOAT:
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162 flags = ALPHA_FLAGS(ALPHA_ST_CPLXF, ALPHA_LD_CPLXF);
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163 break;
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164 case FFI_TYPE_DOUBLE:
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165 flags = ALPHA_FLAGS(ALPHA_ST_CPLXD, ALPHA_LD_CPLXD);
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166 break;
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167 default:
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168 if (rtype->size <= 8)
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169 flags = ALPHA_FLAGS(ALPHA_ST_INT, ALPHA_LD_INT64);
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170 else
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171 flags = ALPHA_RET_IN_MEM;
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172 break;
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173 }
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174 break;
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175 default:
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176 abort();
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177 }
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178 cif->flags = flags;
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179
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180 /* Include the hidden structure pointer in args requirement. */
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181 if (flags == ALPHA_RET_IN_MEM)
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182 bytes += 8;
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183 /* Minimum size is 6 slots, so that ffi_call_osf can pop them. */
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184 if (bytes < 6*8)
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185 bytes = 6*8;
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186 cif->bytes = bytes;
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187
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188 return FFI_OK;
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189 }
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190
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191 static unsigned long
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192 extend_basic_type(void *valp, int type, int argn)
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193 {
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194 switch (type)
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195 {
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196 case FFI_TYPE_SINT8:
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197 return *(SINT8 *)valp;
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198 case FFI_TYPE_UINT8:
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199 return *(UINT8 *)valp;
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200 case FFI_TYPE_SINT16:
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201 return *(SINT16 *)valp;
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202 case FFI_TYPE_UINT16:
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203 return *(UINT16 *)valp;
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204
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205 case FFI_TYPE_FLOAT:
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206 if (argn < 6)
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207 return lds(valp);
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208 /* FALLTHRU */
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209
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210 case FFI_TYPE_INT:
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211 case FFI_TYPE_SINT32:
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212 case FFI_TYPE_UINT32:
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213 /* Note that unsigned 32-bit quantities are sign extended. */
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214 return *(SINT32 *)valp;
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215
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216 case FFI_TYPE_SINT64:
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217 case FFI_TYPE_UINT64:
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218 case FFI_TYPE_POINTER:
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219 case FFI_TYPE_DOUBLE:
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220 return *(UINT64 *)valp;
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221
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222 default:
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223 abort();
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224 }
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225 }
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226
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227 static void
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228 ffi_call_int (ffi_cif *cif, void (*fn)(void), void *rvalue,
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229 void **avalue, void *closure)
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230 {
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231 unsigned long *argp;
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232 long i, avn, argn, flags = cif->flags;
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233 ffi_type **arg_types;
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234 void *frame;
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235
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236 /* If the return value is a struct and we don't have a return
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237 value address then we need to make one. */
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238 if (rvalue == NULL && flags == ALPHA_RET_IN_MEM)
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239 rvalue = alloca(cif->rtype->size);
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240
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241 /* Allocate the space for the arguments, plus 4 words of temp
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242 space for ffi_call_osf. */
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243 argp = frame = alloca(cif->bytes + 4*FFI_SIZEOF_ARG);
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244 frame += cif->bytes;
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245
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246 argn = 0;
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247 if (flags == ALPHA_RET_IN_MEM)
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248 argp[argn++] = (unsigned long)rvalue;
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249
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250 avn = cif->nargs;
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251 arg_types = cif->arg_types;
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252
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253 for (i = 0, avn = cif->nargs; i < avn; i++)
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254 {
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255 ffi_type *ty = arg_types[i];
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256 void *valp = avalue[i];
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257 int type = ty->type;
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258 size_t size;
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259
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260 switch (type)
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261 {
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262 case FFI_TYPE_INT:
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263 case FFI_TYPE_SINT8:
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264 case FFI_TYPE_UINT8:
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265 case FFI_TYPE_SINT16:
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266 case FFI_TYPE_UINT16:
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267 case FFI_TYPE_SINT32:
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268 case FFI_TYPE_UINT32:
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269 case FFI_TYPE_SINT64:
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270 case FFI_TYPE_UINT64:
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271 case FFI_TYPE_POINTER:
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272 case FFI_TYPE_FLOAT:
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273 case FFI_TYPE_DOUBLE:
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274 argp[argn] = extend_basic_type(valp, type, argn);
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275 argn++;
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276 break;
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277
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278 case FFI_TYPE_LONGDOUBLE:
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279 by_reference:
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280 /* Note that 128-bit long double is passed by reference. */
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281 argp[argn++] = (unsigned long)valp;
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282 break;
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283
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284 case FFI_TYPE_VOID:
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285 case FFI_TYPE_STRUCT:
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286 size = ty->size;
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287 memcpy(argp + argn, valp, size);
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288 argn += ALIGN(size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG;
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289 break;
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290
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291 case FFI_TYPE_COMPLEX:
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292 type = ty->elements[0]->type;
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293 if (type == FFI_TYPE_LONGDOUBLE)
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294 goto by_reference;
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295
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296 /* Most complex types passed as two separate arguments. */
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297 size = ty->elements[0]->size;
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298 argp[argn] = extend_basic_type(valp, type, argn);
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299 argp[argn + 1] = extend_basic_type(valp + size, type, argn + 1);
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300 argn += 2;
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301 break;
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302
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303 default:
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304 abort();
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305 }
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306 }
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307
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308 flags = (flags >> ALPHA_ST_SHIFT) & 0xff;
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309 ffi_call_osf(argp, frame, flags, rvalue, fn, closure);
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310 }
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311
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312 void
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313 ffi_call (ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue)
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314 {
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315 ffi_call_int(cif, fn, rvalue, avalue, NULL);
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316 }
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317
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318 void
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319 ffi_call_go (ffi_cif *cif, void (*fn)(void), void *rvalue,
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320 void **avalue, void *closure)
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321 {
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322 ffi_call_int(cif, fn, rvalue, avalue, closure);
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323 }
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324
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325 ffi_status
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326 ffi_prep_closure_loc (ffi_closure* closure,
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327 ffi_cif* cif,
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328 void (*fun)(ffi_cif*, void*, void**, void*),
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329 void *user_data,
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330 void *codeloc)
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331 {
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332 unsigned int *tramp;
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333
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334 if (cif->abi != FFI_OSF)
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335 return FFI_BAD_ABI;
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336
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337 tramp = (unsigned int *) &closure->tramp[0];
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338 tramp[0] = 0x47fb0401; /* mov $27,$1 */
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339 tramp[1] = 0xa77b0010; /* ldq $27,16($27) */
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340 tramp[2] = 0x6bfb0000; /* jmp $31,($27),0 */
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341 tramp[3] = 0x47ff041f; /* nop */
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342 *(void **) &tramp[4] = ffi_closure_osf;
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343
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344 closure->cif = cif;
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345 closure->fun = fun;
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346 closure->user_data = user_data;
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347
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348 /* Flush the Icache.
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349
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350 Tru64 UNIX as doesn't understand the imb mnemonic, so use call_pal
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351 instead, since both Compaq as and gas can handle it.
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352
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353 0x86 is PAL_imb in Tru64 UNIX <alpha/pal.h>. */
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354 asm volatile ("call_pal 0x86" : : : "memory");
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355
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356 return FFI_OK;
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357 }
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358
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359 ffi_status
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360 ffi_prep_go_closure (ffi_go_closure* closure,
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361 ffi_cif* cif,
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362 void (*fun)(ffi_cif*, void*, void**, void*))
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363 {
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364 if (cif->abi != FFI_OSF)
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365 return FFI_BAD_ABI;
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366
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367 closure->tramp = (void *)ffi_go_closure_osf;
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368 closure->cif = cif;
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369 closure->fun = fun;
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370
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371 return FFI_OK;
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372 }
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373
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374 long FFI_HIDDEN
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375 ffi_closure_osf_inner (ffi_cif *cif,
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376 void (*fun)(ffi_cif*, void*, void**, void*),
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377 void *user_data,
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378 void *rvalue, unsigned long *argp)
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379 {
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380 void **avalue;
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381 ffi_type **arg_types;
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382 long i, avn, argn, flags;
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383
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384 avalue = alloca(cif->nargs * sizeof(void *));
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385 flags = cif->flags;
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386 argn = 0;
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387
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388 /* Copy the caller's structure return address to that the closure
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389 returns the data directly to the caller. */
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390 if (flags == ALPHA_RET_IN_MEM)
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391 {
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392 rvalue = (void *) argp[0];
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393 argn = 1;
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394 }
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395
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396 arg_types = cif->arg_types;
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397
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398 /* Grab the addresses of the arguments from the stack frame. */
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399 for (i = 0, avn = cif->nargs; i < avn; i++)
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400 {
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401 ffi_type *ty = arg_types[i];
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402 int type = ty->type;
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403 void *valp = &argp[argn];
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404 size_t size;
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405
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406 switch (type)
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407 {
|
|
|
408 case FFI_TYPE_INT:
|
|
|
409 case FFI_TYPE_SINT8:
|
|
|
410 case FFI_TYPE_UINT8:
|
|
|
411 case FFI_TYPE_SINT16:
|
|
|
412 case FFI_TYPE_UINT16:
|
|
|
413 case FFI_TYPE_SINT32:
|
|
|
414 case FFI_TYPE_UINT32:
|
|
|
415 case FFI_TYPE_SINT64:
|
|
|
416 case FFI_TYPE_UINT64:
|
|
|
417 case FFI_TYPE_POINTER:
|
|
|
418 argn += 1;
|
|
|
419 break;
|
|
|
420
|
|
|
421 case FFI_TYPE_VOID:
|
|
|
422 case FFI_TYPE_STRUCT:
|
|
|
423 size = ty->size;
|
|
|
424 argn += ALIGN(size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG;
|
|
|
425 break;
|
|
|
426
|
|
|
427 case FFI_TYPE_FLOAT:
|
|
|
428 /* Floats coming from registers need conversion from double
|
|
|
429 back to float format. */
|
|
|
430 if (argn < 6)
|
|
|
431 {
|
|
|
432 valp = &argp[argn - 6];
|
|
|
433 sts(valp, argp[argn - 6]);
|
|
|
434 }
|
|
|
435 argn += 1;
|
|
|
436 break;
|
|
|
437
|
|
|
438 case FFI_TYPE_DOUBLE:
|
|
|
439 if (argn < 6)
|
|
|
440 valp = &argp[argn - 6];
|
|
|
441 argn += 1;
|
|
|
442 break;
|
|
|
443
|
|
|
444 case FFI_TYPE_LONGDOUBLE:
|
|
|
445 by_reference:
|
|
|
446 /* 128-bit long double is passed by reference. */
|
|
|
447 valp = (void *)argp[argn];
|
|
|
448 argn += 1;
|
|
|
449 break;
|
|
|
450
|
|
|
451 case FFI_TYPE_COMPLEX:
|
|
|
452 type = ty->elements[0]->type;
|
|
|
453 switch (type)
|
|
|
454 {
|
|
|
455 case FFI_TYPE_SINT64:
|
|
|
456 case FFI_TYPE_UINT64:
|
|
|
457 /* Passed as separate arguments, but they wind up sequential. */
|
|
|
458 break;
|
|
|
459
|
|
|
460 case FFI_TYPE_INT:
|
|
|
461 case FFI_TYPE_SINT8:
|
|
|
462 case FFI_TYPE_UINT8:
|
|
|
463 case FFI_TYPE_SINT16:
|
|
|
464 case FFI_TYPE_UINT16:
|
|
|
465 case FFI_TYPE_SINT32:
|
|
|
466 case FFI_TYPE_UINT32:
|
|
|
467 /* Passed as separate arguments. Disjoint, but there's room
|
|
|
468 enough in one slot to hold the pair. */
|
|
|
469 size = ty->elements[0]->size;
|
|
|
470 memcpy(valp + size, valp + 8, size);
|
|
|
471 break;
|
|
|
472
|
|
|
473 case FFI_TYPE_FLOAT:
|
|
|
474 /* Passed as separate arguments. Disjoint, and each piece
|
|
|
475 may need conversion back to float. */
|
|
|
476 if (argn < 6)
|
|
|
477 {
|
|
|
478 valp = &argp[argn - 6];
|
|
|
479 sts(valp, argp[argn - 6]);
|
|
|
480 }
|
|
|
481 if (argn + 1 < 6)
|
|
|
482 sts(valp + 4, argp[argn + 1 - 6]);
|
|
|
483 else
|
|
|
484 *(UINT32 *)(valp + 4) = argp[argn + 1];
|
|
|
485 break;
|
|
|
486
|
|
|
487 case FFI_TYPE_DOUBLE:
|
|
|
488 /* Passed as separate arguments. Only disjoint if one part
|
|
|
489 is in fp regs and the other is on the stack. */
|
|
|
490 if (argn < 5)
|
|
|
491 valp = &argp[argn - 6];
|
|
|
492 else if (argn == 5)
|
|
|
493 {
|
|
|
494 valp = alloca(16);
|
|
|
495 ((UINT64 *)valp)[0] = argp[5 - 6];
|
|
|
496 ((UINT64 *)valp)[1] = argp[6];
|
|
|
497 }
|
|
|
498 break;
|
|
|
499
|
|
|
500 case FFI_TYPE_LONGDOUBLE:
|
|
|
501 goto by_reference;
|
|
|
502
|
|
|
503 default:
|
|
|
504 abort();
|
|
|
505 }
|
|
|
506 argn += 2;
|
|
|
507 break;
|
|
|
508
|
|
|
509 default:
|
|
|
510 abort ();
|
|
|
511 }
|
|
|
512
|
|
|
513 avalue[i] = valp;
|
|
|
514 }
|
|
|
515
|
|
|
516 /* Invoke the closure. */
|
|
|
517 fun (cif, rvalue, avalue, user_data);
|
|
|
518
|
|
|
519 /* Tell ffi_closure_osf how to perform return type promotions. */
|
|
|
520 return (flags >> ALPHA_LD_SHIFT) & 0xff;
|
|
|
521 }
|
