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1 //======================================================================== |
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2 // |
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3 // malloc.cxx |
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4 // |
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5 // Implementation of ISO C memory allocation routines |
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6 // |
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7 //======================================================================== |
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8 //####COPYRIGHTBEGIN#### |
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9 // |
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10 // ------------------------------------------- |
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11 // The contents of this file are subject to the Cygnus eCos Public License |
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12 // Version 1.0 (the "License"); you may not use this file except in |
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13 // compliance with the License. You may obtain a copy of the License at |
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14 // http://sourceware.cygnus.com/ecos |
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15 // |
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16 // Software distributed under the License is distributed on an "AS IS" |
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the |
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18 // License for the specific language governing rights and limitations under |
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19 // the License. |
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20 // |
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21 // The Original Code is eCos - Embedded Cygnus Operating System, released |
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22 // September 30, 1998. |
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23 // |
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24 // The Initial Developer of the Original Code is Cygnus. Portions created |
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25 // by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved. |
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26 // ------------------------------------------- |
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27 // |
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28 //####COPYRIGHTEND#### |
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29 //======================================================================== |
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30 //#####DESCRIPTIONBEGIN#### |
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31 // |
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32 // Author(s): jlarmour |
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33 // Contributors: jlarmour |
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34 // Date: 1999-01-21 |
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35 // Purpose: Provides ISO C calloc(), malloc(), realloc() and free() |
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36 // functions |
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37 // Description: Implementation of ANSI standard allocation routines as per |
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38 // ISO C section 7.10.3 |
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39 // Usage: |
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40 // |
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41 //####DESCRIPTIONEND#### |
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42 // |
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43 //======================================================================== |
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44 |
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45 // CONFIGURATION |
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46 |
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47 #include <pkgconf/libc.h> // Configuration header |
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48 |
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49 // Do we want these functions? |
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50 #ifdef CYGPKG_LIBC_MALLOC |
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51 |
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52 // INCLUDES |
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53 |
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54 #include <cyg/infra/cyg_type.h> // Common type definitions and support |
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55 #include <cyg/infra/cyg_trac.h> // Common tracing support |
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56 #include <cyg/infra/cyg_ass.h> // Common assertion support |
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57 #include <string.h> // For memset() and memcpy() |
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58 #include <stdlib.h> // header for this file |
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59 #include <pkgconf/kernel.h> // kernel configuration |
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60 #include <cyg/kernel/memvar.hxx> // Kernel variable size block allocator |
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61 |
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62 #include "clibincl/stdlibsupp.hxx" // Additional support for stdlib stuff |
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63 // internal to the C library |
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64 |
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65 // EXPORTED SYMBOLS |
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66 |
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67 externC void * |
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68 calloc( size_t, size_t ) CYGBLD_ATTRIB_WEAK_ALIAS(_calloc); |
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69 |
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70 externC void |
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71 free( void * ) CYGBLD_ATTRIB_WEAK_ALIAS(_free); |
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72 |
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73 externC void * |
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74 malloc( size_t ) CYGBLD_ATTRIB_WEAK_ALIAS(_malloc); |
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75 |
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76 externC void * |
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77 realloc( void *, size_t ) CYGBLD_ATTRIB_WEAK_ALIAS(_realloc); |
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78 |
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79 |
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80 // STATIC VARIABLES |
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81 |
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82 // the data space for the memory pool - can be externally overriden |
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83 // FIXME: but should be in different file for this to work |
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84 cyg_uint8 cyg_libc_malloc_memorypool[ CYGNUM_LIBC_MALLOC_MEMPOOL_SIZE ] |
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85 CYGBLD_ATTRIB_WEAK; |
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86 |
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87 // the memory pool object itself |
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88 static Cyg_Mempool_Variable pool CYG_INIT_PRIORITY( LIBC ) = |
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89 Cyg_Mempool_Variable( cyg_libc_malloc_memorypool, |
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90 CYGNUM_LIBC_MALLOC_MEMPOOL_SIZE ); |
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91 |
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92 |
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93 // FUNCTIONS |
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94 |
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95 void * |
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96 _malloc( size_t size ) |
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97 { |
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98 void *data_ptr; |
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99 |
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100 CYG_REPORT_FUNCNAMETYPE( "_malloc", "returning pointer %08x" ); |
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101 |
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102 CYG_REPORT_FUNCARG1DV( size ); |
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103 |
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104 // first check if size wanted is 0 |
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105 if (!size) { |
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106 CYG_REPORT_RETVAL( NULL ); |
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107 return NULL; |
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108 } // if |
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109 |
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110 // ask the pool for the data |
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111 data_ptr = pool.try_alloc( size ); |
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112 |
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113 // if it isn't NULL is the pointer valid? |
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114 if (data_ptr != NULL) { |
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115 CYG_CHECK_DATA_PTR( data_ptr, |
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116 "allocator returned invalid pointer!" ); |
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117 |
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118 // And just check its alignment |
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119 CYG_ASSERT( !((CYG_ADDRWORD)data_ptr & (sizeof(CYG_ADDRWORD) - 1)), |
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120 "Allocator has returned badly aligned data!"); |
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121 } // if |
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122 |
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123 CYG_REPORT_RETVAL( data_ptr ); |
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124 |
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125 return data_ptr; |
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126 } // _malloc() |
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127 |
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128 |
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129 void |
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130 _free( void *ptr ) |
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131 { |
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132 CYG_REPORT_FUNCNAME( "_free"); |
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133 |
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134 CYG_REPORT_FUNCARG1XV( ptr ); |
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135 |
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136 // if null pointer, do nothing as per spec |
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137 if (ptr==NULL) |
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138 return; |
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139 |
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140 CYG_CHECK_DATA_PTR( ptr, "Pointer to free isn't even valid!" ); |
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141 |
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142 // get pool to free it. Use size==0 for pool to determine the size |
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143 // Also ignore return value - there's nothing we can do with it |
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144 pool.free( (cyg_uint8 *) ptr, 0 ); |
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145 |
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146 CYG_REPORT_RETURN(); |
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147 |
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148 } // _free() |
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149 |
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150 |
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151 void * |
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152 _calloc( size_t nmemb, size_t size ) |
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153 { |
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154 void *data_ptr; |
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155 cyg_ucount32 realsize; |
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156 |
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157 CYG_REPORT_FUNCNAMETYPE( "_calloc", "returning pointer %08x" ); |
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158 |
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159 CYG_REPORT_FUNCARG2DV( nmemb, size ); |
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160 |
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161 realsize = nmemb * size; |
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162 |
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163 data_ptr = _malloc( realsize ); |
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164 |
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165 // Fill with 0's if non-NULL |
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166 if (data_ptr != NULL) |
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167 memset( data_ptr, 0, realsize ); |
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168 |
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169 CYG_REPORT_RETVAL( data_ptr ); |
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170 return data_ptr; |
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171 } // _calloc() |
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172 |
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173 |
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174 externC void * |
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175 _realloc( void *ptr, size_t size ) |
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176 { |
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177 void *ret_ptr; |
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178 cyg_int32 oldsize; |
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179 |
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180 CYG_REPORT_FUNCNAMETYPE( "_realloc", "returning pointer %08x" ); |
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181 |
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182 CYG_REPORT_FUNCARG2( "ptr=%08x, size=%d", ptr, size ); |
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183 |
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184 // if pointer is NULL, we must malloc it |
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185 if (ptr == NULL) { |
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186 ret_ptr = _malloc( size ); |
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187 CYG_REPORT_RETVAL( ret_ptr ); |
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188 return ret_ptr; |
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189 } // if |
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190 |
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191 CYG_CHECK_DATA_PTR( ptr, "_realloc() passed a bogus pointer!" ); |
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192 |
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193 // if size is 0, we must free it |
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194 if (size == 0) { |
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195 _free(ptr); |
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196 CYG_REPORT_RETVAL( NULL ); |
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197 return NULL; |
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198 } // if |
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199 |
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200 |
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201 oldsize = pool.get_allocation_size( (cyg_uint8 *)ptr ); |
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202 |
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203 CYG_ASSERT( oldsize != -1, |
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204 "_realloc() couldn't find allocation size!" ); |
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205 |
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206 ret_ptr = _malloc( size ); |
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207 |
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208 // as long as malloc succeeded |
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209 if (ret_ptr != NULL) { |
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210 // copy old contents |
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211 memcpy( ret_ptr, ptr, size < (size_t) oldsize ? size |
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212 : (size_t) oldsize ); |
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213 |
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214 _free(ptr); |
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215 } // if |
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216 |
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217 CYG_REPORT_RETVAL( ret_ptr ); |
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218 return ret_ptr; |
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219 } // _realloc() |
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220 |
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221 #endif // ifdef CYGPKG_LIBC_MALLOC |
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222 |
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223 // EOF malloc.cxx |
