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1 /* |
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2 * Generic thunking code to convert data between host and target CPU |
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3 * |
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4 * Copyright (c) 2003 Fabrice Bellard |
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5 * |
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6 * This library is free software; you can redistribute it and/or |
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7 * modify it under the terms of the GNU Lesser General Public |
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8 * License as published by the Free Software Foundation; either |
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9 * version 2 of the License, or (at your option) any later version. |
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10 * |
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11 * This library is distributed in the hope that it will be useful, |
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 * Lesser General Public License for more details. |
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15 * |
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16 * You should have received a copy of the GNU Lesser General Public |
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17 * License along with this library; if not, write to the Free Software |
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18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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19 */ |
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20 #include <stdlib.h> |
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21 #include <stdio.h> |
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22 #include <stdarg.h> |
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23 |
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24 #include "qemu.h" |
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25 #include "thunk.h" |
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26 |
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27 //#define DEBUG |
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28 |
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29 #define MAX_STRUCTS 128 |
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30 |
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31 /* XXX: make it dynamic */ |
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32 StructEntry struct_entries[MAX_STRUCTS]; |
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33 |
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34 static const argtype *thunk_type_next_ptr(const argtype *type_ptr); |
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35 |
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36 static inline const argtype *thunk_type_next(const argtype *type_ptr) |
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37 { |
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38 int type; |
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39 |
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40 type = *type_ptr++; |
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41 switch(type) { |
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42 case TYPE_CHAR: |
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43 case TYPE_SHORT: |
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44 case TYPE_INT: |
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45 case TYPE_LONGLONG: |
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46 case TYPE_ULONGLONG: |
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47 case TYPE_LONG: |
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48 case TYPE_ULONG: |
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49 case TYPE_PTRVOID: |
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50 return type_ptr; |
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51 case TYPE_PTR: |
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52 return thunk_type_next_ptr(type_ptr); |
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53 case TYPE_ARRAY: |
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54 return thunk_type_next_ptr(type_ptr + 1); |
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55 case TYPE_STRUCT: |
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56 return type_ptr + 1; |
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57 default: |
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58 return NULL; |
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59 } |
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60 } |
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61 |
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62 static const argtype *thunk_type_next_ptr(const argtype *type_ptr) |
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63 { |
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64 return thunk_type_next(type_ptr); |
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65 } |
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66 |
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67 void thunk_register_struct(int id, const char *name, const argtype *types) |
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68 { |
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69 const argtype *type_ptr; |
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70 StructEntry *se; |
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71 int nb_fields, offset, max_align, align, size, i, j; |
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72 |
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73 se = struct_entries + id; |
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74 |
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75 /* first we count the number of fields */ |
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76 type_ptr = types; |
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77 nb_fields = 0; |
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78 while (*type_ptr != TYPE_NULL) { |
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79 type_ptr = thunk_type_next(type_ptr); |
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80 nb_fields++; |
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81 } |
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82 se->field_types = types; |
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83 se->nb_fields = nb_fields; |
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84 se->name = name; |
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85 #ifdef DEBUG |
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86 printf("struct %s: id=%d nb_fields=%d\n", |
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87 se->name, id, se->nb_fields); |
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88 #endif |
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89 /* now we can alloc the data */ |
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90 |
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91 for(i = 0;i < 2; i++) { |
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92 offset = 0; |
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93 max_align = 1; |
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94 se->field_offsets[i] = malloc(nb_fields * sizeof(int)); |
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95 type_ptr = se->field_types; |
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96 for(j = 0;j < nb_fields; j++) { |
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97 size = thunk_type_size(type_ptr, i); |
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98 align = thunk_type_align(type_ptr, i); |
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99 offset = (offset + align - 1) & ~(align - 1); |
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100 se->field_offsets[i][j] = offset; |
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101 offset += size; |
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102 if (align > max_align) |
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103 max_align = align; |
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104 type_ptr = thunk_type_next(type_ptr); |
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105 } |
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106 offset = (offset + max_align - 1) & ~(max_align - 1); |
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107 se->size[i] = offset; |
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108 se->align[i] = max_align; |
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109 #ifdef DEBUG |
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110 printf("%s: size=%d align=%d\n", |
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111 i == THUNK_HOST ? "host" : "target", offset, max_align); |
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112 #endif |
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113 } |
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114 } |
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115 |
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116 void thunk_register_struct_direct(int id, const char *name, |
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117 const StructEntry *se1) |
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118 { |
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119 StructEntry *se; |
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120 se = struct_entries + id; |
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121 *se = *se1; |
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122 se->name = name; |
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123 } |
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124 |
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125 |
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126 /* now we can define the main conversion functions */ |
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127 const argtype *thunk_convert(void *dst, const void *src, |
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128 const argtype *type_ptr, int to_host) |
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129 { |
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130 int type; |
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131 |
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132 type = *type_ptr++; |
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133 switch(type) { |
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134 case TYPE_CHAR: |
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135 *(uint8_t *)dst = *(uint8_t *)src; |
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136 break; |
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137 case TYPE_SHORT: |
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138 *(uint16_t *)dst = tswap16(*(uint16_t *)src); |
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139 break; |
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140 case TYPE_INT: |
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141 *(uint32_t *)dst = tswap32(*(uint32_t *)src); |
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142 break; |
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143 case TYPE_LONGLONG: |
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144 case TYPE_ULONGLONG: |
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145 *(uint64_t *)dst = tswap64(*(uint64_t *)src); |
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146 break; |
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147 #if HOST_LONG_BITS == 32 && TARGET_ABI_BITS == 32 |
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148 case TYPE_LONG: |
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149 case TYPE_ULONG: |
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150 case TYPE_PTRVOID: |
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151 *(uint32_t *)dst = tswap32(*(uint32_t *)src); |
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152 break; |
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153 #elif HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 32 |
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154 case TYPE_LONG: |
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155 case TYPE_ULONG: |
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156 case TYPE_PTRVOID: |
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157 if (to_host) { |
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158 if (type == TYPE_LONG) { |
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159 /* sign extension */ |
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160 *(uint64_t *)dst = (int32_t)tswap32(*(uint32_t *)src); |
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161 } else { |
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162 *(uint64_t *)dst = tswap32(*(uint32_t *)src); |
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163 } |
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164 } else { |
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165 *(uint32_t *)dst = tswap32(*(uint64_t *)src & 0xffffffff); |
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166 } |
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167 break; |
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168 #elif HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 64 |
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169 case TYPE_LONG: |
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170 case TYPE_ULONG: |
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171 case TYPE_PTRVOID: |
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172 *(uint64_t *)dst = tswap64(*(uint64_t *)src); |
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173 break; |
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174 #elif HOST_LONG_BITS == 32 && TARGET_ABI_BITS == 64 |
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175 case TYPE_LONG: |
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176 case TYPE_ULONG: |
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177 case TYPE_PTRVOID: |
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178 if (to_host) { |
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179 *(uint32_t *)dst = tswap64(*(uint64_t *)src); |
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180 } else { |
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181 if (type == TYPE_LONG) { |
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182 /* sign extension */ |
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183 *(uint64_t *)dst = tswap64(*(int32_t *)src); |
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184 } else { |
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185 *(uint64_t *)dst = tswap64(*(uint32_t *)src); |
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186 } |
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187 } |
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188 break; |
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189 #else |
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190 #warning unsupported conversion |
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191 #endif |
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192 case TYPE_ARRAY: |
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193 { |
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194 int array_length, i, dst_size, src_size; |
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195 const uint8_t *s; |
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196 uint8_t *d; |
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197 |
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198 array_length = *type_ptr++; |
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199 dst_size = thunk_type_size(type_ptr, to_host); |
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200 src_size = thunk_type_size(type_ptr, 1 - to_host); |
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201 d = dst; |
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202 s = src; |
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203 for(i = 0;i < array_length; i++) { |
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204 thunk_convert(d, s, type_ptr, to_host); |
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205 d += dst_size; |
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206 s += src_size; |
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207 } |
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208 type_ptr = thunk_type_next(type_ptr); |
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209 } |
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210 break; |
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211 case TYPE_STRUCT: |
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212 { |
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213 int i; |
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214 const StructEntry *se; |
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215 const uint8_t *s; |
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216 uint8_t *d; |
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217 const argtype *field_types; |
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218 const int *dst_offsets, *src_offsets; |
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219 |
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220 se = struct_entries + *type_ptr++; |
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221 if (se->convert[0] != NULL) { |
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222 /* specific conversion is needed */ |
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223 (*se->convert[to_host])(dst, src); |
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224 } else { |
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225 /* standard struct conversion */ |
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226 field_types = se->field_types; |
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227 dst_offsets = se->field_offsets[to_host]; |
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228 src_offsets = se->field_offsets[1 - to_host]; |
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229 d = dst; |
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230 s = src; |
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231 for(i = 0;i < se->nb_fields; i++) { |
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232 field_types = thunk_convert(d + dst_offsets[i], |
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233 s + src_offsets[i], |
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234 field_types, to_host); |
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235 } |
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236 } |
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237 } |
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238 break; |
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239 default: |
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240 fprintf(stderr, "Invalid type 0x%x\n", type); |
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241 break; |
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242 } |
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243 return type_ptr; |
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244 } |
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245 |
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246 /* from em86 */ |
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247 |
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248 /* Utility function: Table-driven functions to translate bitmasks |
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249 * between X86 and Alpha formats... |
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250 */ |
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251 unsigned int target_to_host_bitmask(unsigned int x86_mask, |
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252 const bitmask_transtbl * trans_tbl) |
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253 { |
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254 const bitmask_transtbl *btp; |
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255 unsigned int alpha_mask = 0; |
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256 |
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257 for(btp = trans_tbl; btp->x86_mask && btp->alpha_mask; btp++) { |
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258 if((x86_mask & btp->x86_mask) == btp->x86_bits) { |
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259 alpha_mask |= btp->alpha_bits; |
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260 } |
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261 } |
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262 return(alpha_mask); |
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263 } |
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264 |
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265 unsigned int host_to_target_bitmask(unsigned int alpha_mask, |
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266 const bitmask_transtbl * trans_tbl) |
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267 { |
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268 const bitmask_transtbl *btp; |
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269 unsigned int x86_mask = 0; |
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270 |
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271 for(btp = trans_tbl; btp->x86_mask && btp->alpha_mask; btp++) { |
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272 if((alpha_mask & btp->alpha_mask) == btp->alpha_bits) { |
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273 x86_mask |= btp->x86_bits; |
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274 } |
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275 } |
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276 return(x86_mask); |
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277 } |
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278 |
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279 #ifndef NO_THUNK_TYPE_SIZE |
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280 int thunk_type_size_array(const argtype *type_ptr, int is_host) |
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281 { |
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282 return thunk_type_size(type_ptr, is_host); |
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283 } |
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284 |
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285 int thunk_type_align_array(const argtype *type_ptr, int is_host) |
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286 { |
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287 return thunk_type_align(type_ptr, is_host); |
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288 } |
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289 #endif /* ndef NO_THUNK_TYPE_SIZE */ |