1 | /* |
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2 | * RTEMS Malloc Family Implementation |
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3 | * |
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4 | * |
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5 | * COPYRIGHT (c) 1989-1999. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * |
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8 | * The license and distribution terms for this file may be |
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9 | * found in the file LICENSE in this distribution or at |
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10 | * http://www.OARcorp.com/rtems/license.html. |
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11 | * |
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12 | * $Id$ |
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13 | */ |
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14 | |
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15 | #define __RTEMS_VIOLATE_KERNEL_VISIBILITY__ |
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16 | #include <rtems.h> |
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17 | #include "libcsupport.h" |
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18 | #ifdef RTEMS_NEWLIB |
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19 | #include <sys/reent.h> |
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20 | #endif |
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21 | |
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22 | #include <stdio.h> |
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23 | #include <stdlib.h> |
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24 | #include <sys/types.h> |
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25 | #include <assert.h> |
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26 | #include <errno.h> |
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27 | #include <string.h> |
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28 | |
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29 | #include <unistd.h> /* sbrk(2) */ |
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30 | |
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31 | rtems_id RTEMS_Malloc_Heap; |
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32 | size_t RTEMS_Malloc_Sbrk_amount; |
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33 | |
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34 | #ifdef RTEMS_DEBUG |
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35 | #define MALLOC_STATS |
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36 | #define MALLOC_DIRTY |
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37 | #endif |
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38 | |
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39 | #ifdef MALLOC_STATS |
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40 | #define MSBUMP(f,n) rtems_malloc_stats.f += (n) |
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41 | |
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42 | struct { |
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43 | unsigned32 space_available; /* current size of malloc area */ |
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44 | unsigned32 malloc_calls; /* # calls to malloc */ |
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45 | unsigned32 free_calls; |
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46 | unsigned32 realloc_calls; |
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47 | unsigned32 calloc_calls; |
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48 | unsigned32 max_depth; /* most ever malloc'd at 1 time */ |
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49 | unsigned64 lifetime_allocated; |
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50 | unsigned64 lifetime_freed; |
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51 | } rtems_malloc_stats; |
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52 | |
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53 | #else /* No rtems_malloc_stats */ |
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54 | #define MSBUMP(f,n) |
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55 | #endif |
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56 | |
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57 | void RTEMS_Malloc_Initialize( |
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58 | void *start, |
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59 | size_t length, |
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60 | size_t sbrk_amount |
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61 | ) |
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62 | { |
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63 | rtems_status_code status; |
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64 | void *starting_address; |
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65 | rtems_unsigned32 old_address; |
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66 | rtems_unsigned32 u32_address; |
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67 | |
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68 | /* |
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69 | * If the starting address is 0 then we are to attempt to |
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70 | * get length worth of memory using sbrk. Make sure we |
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71 | * align the address that we get back. |
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72 | */ |
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73 | |
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74 | starting_address = start; |
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75 | RTEMS_Malloc_Sbrk_amount = sbrk_amount; |
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76 | |
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77 | if (!starting_address) { |
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78 | u32_address = (unsigned int)sbrk(length); |
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79 | |
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80 | if (u32_address == (rtems_unsigned32) -1) { |
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81 | rtems_fatal_error_occurred( RTEMS_NO_MEMORY ); |
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82 | /* DOES NOT RETURN!!! */ |
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83 | } |
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84 | |
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85 | if (u32_address & (CPU_ALIGNMENT-1)) { |
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86 | old_address = u32_address; |
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87 | u32_address = (u32_address + CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1); |
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88 | |
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89 | /* |
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90 | * adjust the length by whatever we aligned by |
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91 | */ |
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92 | |
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93 | length -= u32_address - old_address; |
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94 | } |
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95 | |
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96 | starting_address = (void *)u32_address; |
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97 | } |
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98 | |
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99 | /* |
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100 | * If the BSP is not clearing out the workspace, then it is most likely |
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101 | * not clearing out the initial memory for the heap. There is no |
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102 | * standard supporting zeroing out the heap memory. But much code |
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103 | * with UNIX history seems to assume that memory malloc'ed during |
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104 | * initialization (before any free's) is zero'ed. This is true most |
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105 | * of the time under UNIX because zero'ing memory when it is first |
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106 | * given to a process eliminates the chance of a process seeing data |
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107 | * left over from another process. This would be a security violation. |
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108 | */ |
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109 | |
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110 | if ( rtems_cpu_configuration_get_do_zero_of_workspace() ) |
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111 | memset( starting_address, 0, length ); |
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112 | |
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113 | /* |
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114 | * Unfortunately we cannot use assert if this fails because if this |
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115 | * has failed we do not have a heap and if we do not have a heap |
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116 | * STDIO cannot work because there will be no buffers. |
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117 | */ |
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118 | |
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119 | status = rtems_region_create( |
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120 | rtems_build_name( 'H', 'E', 'A', 'P' ), |
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121 | starting_address, |
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122 | length, |
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123 | CPU_HEAP_ALIGNMENT, |
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124 | RTEMS_DEFAULT_ATTRIBUTES, |
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125 | &RTEMS_Malloc_Heap |
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126 | ); |
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127 | if ( status != RTEMS_SUCCESSFUL ) |
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128 | rtems_fatal_error_occurred( status ); |
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129 | |
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130 | #ifdef MALLOC_STATS |
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131 | /* zero all the stats */ |
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132 | (void) memset( &rtems_malloc_stats, 0, sizeof(rtems_malloc_stats) ); |
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133 | #endif |
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134 | |
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135 | MSBUMP(space_available, length); |
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136 | } |
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137 | |
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138 | #ifdef RTEMS_NEWLIB |
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139 | void *malloc( |
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140 | size_t size |
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141 | ) |
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142 | { |
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143 | void *return_this; |
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144 | void *starting_address; |
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145 | rtems_unsigned32 the_size; |
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146 | rtems_unsigned32 sbrk_amount; |
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147 | rtems_status_code status; |
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148 | |
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149 | MSBUMP(malloc_calls, 1); |
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150 | |
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151 | if ( !size ) |
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152 | return (void *) 0; |
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153 | |
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154 | /* |
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155 | * Try to give a segment in the current region if there is not |
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156 | * enough space then try to grow the region using rtems_region_extend(). |
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157 | * If this fails then return a NULL pointer. |
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158 | */ |
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159 | |
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160 | status = rtems_region_get_segment( |
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161 | RTEMS_Malloc_Heap, |
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162 | size, |
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163 | RTEMS_NO_WAIT, |
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164 | RTEMS_NO_TIMEOUT, |
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165 | &return_this |
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166 | ); |
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167 | |
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168 | if ( status != RTEMS_SUCCESSFUL ) { |
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169 | /* |
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170 | * Round to the "requested sbrk amount" so hopefully we won't have |
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171 | * to grow again for a while. This effectively does sbrk() calls |
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172 | * in "page" amounts. |
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173 | */ |
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174 | |
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175 | sbrk_amount = RTEMS_Malloc_Sbrk_amount; |
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176 | |
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177 | if ( sbrk_amount == 0 ) |
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178 | return (void *) 0; |
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179 | |
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180 | the_size = ((size + sbrk_amount) / sbrk_amount * sbrk_amount); |
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181 | |
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182 | if (((rtems_unsigned32)starting_address = (void *)sbrk(the_size)) |
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183 | == (rtems_unsigned32) -1) |
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184 | return (void *) 0; |
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185 | |
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186 | status = rtems_region_extend( |
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187 | RTEMS_Malloc_Heap, |
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188 | starting_address, |
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189 | the_size |
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190 | ); |
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191 | if ( status != RTEMS_SUCCESSFUL ) { |
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192 | sbrk(-the_size); |
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193 | errno = ENOMEM; |
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194 | return (void *) 0; |
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195 | } |
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196 | |
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197 | MSBUMP(space_available, the_size); |
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198 | |
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199 | status = rtems_region_get_segment( |
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200 | RTEMS_Malloc_Heap, |
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201 | size, |
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202 | RTEMS_NO_WAIT, |
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203 | RTEMS_NO_TIMEOUT, |
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204 | &return_this |
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205 | ); |
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206 | if ( status != RTEMS_SUCCESSFUL ) { |
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207 | errno = ENOMEM; |
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208 | return (void *) 0; |
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209 | } |
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210 | } |
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211 | |
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212 | #ifdef MALLOC_STATS |
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213 | if (return_this) |
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214 | { |
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215 | unsigned32 actual_size; |
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216 | unsigned32 current_depth; |
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217 | status = rtems_region_get_segment_size( |
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218 | RTEMS_Malloc_Heap, return_this, &actual_size); |
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219 | MSBUMP(lifetime_allocated, actual_size); |
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220 | current_depth = rtems_malloc_stats.lifetime_allocated - |
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221 | rtems_malloc_stats.lifetime_freed; |
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222 | if (current_depth > rtems_malloc_stats.max_depth) |
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223 | rtems_malloc_stats.max_depth = current_depth; |
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224 | } |
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225 | #endif |
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226 | |
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227 | #ifdef MALLOC_DIRTY |
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228 | (void) memset(return_this, 0xCF, size); |
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229 | #endif |
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230 | |
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231 | return return_this; |
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232 | } |
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233 | |
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234 | void *calloc( |
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235 | size_t nelem, |
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236 | size_t elsize |
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237 | ) |
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238 | { |
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239 | register char *cptr; |
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240 | int length; |
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241 | |
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242 | MSBUMP(calloc_calls, 1); |
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243 | |
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244 | length = nelem * elsize; |
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245 | cptr = malloc( length ); |
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246 | if ( cptr ) |
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247 | memset( cptr, '\0', length ); |
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248 | |
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249 | MSBUMP(malloc_calls, -1); /* subtract off the malloc */ |
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250 | |
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251 | return cptr; |
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252 | } |
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253 | |
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254 | void *realloc( |
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255 | void *ptr, |
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256 | size_t size |
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257 | ) |
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258 | { |
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259 | rtems_unsigned32 old_size; |
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260 | rtems_status_code status; |
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261 | char *new_area; |
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262 | |
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263 | MSBUMP(realloc_calls, 1); |
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264 | |
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265 | if ( !ptr ) |
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266 | return malloc( size ); |
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267 | |
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268 | if ( !size ) { |
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269 | free( ptr ); |
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270 | return (void *) 0; |
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271 | } |
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272 | |
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273 | new_area = malloc( size ); |
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274 | |
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275 | MSBUMP(malloc_calls, -1); /* subtract off the malloc */ |
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276 | |
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277 | if ( !new_area ) { |
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278 | free( ptr ); |
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279 | return (void *) 0; |
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280 | } |
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281 | |
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282 | status = rtems_region_get_segment_size( RTEMS_Malloc_Heap, ptr, &old_size ); |
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283 | if ( status != RTEMS_SUCCESSFUL ) { |
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284 | errno = EINVAL; |
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285 | return (void *) 0; |
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286 | } |
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287 | |
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288 | memcpy( new_area, ptr, (size < old_size) ? size : old_size ); |
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289 | free( ptr ); |
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290 | |
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291 | return new_area; |
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292 | |
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293 | } |
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294 | |
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295 | void free( |
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296 | void *ptr |
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297 | ) |
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298 | { |
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299 | rtems_status_code status; |
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300 | |
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301 | MSBUMP(free_calls, 1); |
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302 | |
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303 | if ( !ptr ) |
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304 | return; |
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305 | |
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306 | #ifdef MALLOC_STATS |
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307 | { |
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308 | unsigned32 size; |
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309 | status = rtems_region_get_segment_size( RTEMS_Malloc_Heap, ptr, &size ); |
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310 | if ( status == RTEMS_SUCCESSFUL ) { |
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311 | MSBUMP(lifetime_freed, size); |
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312 | } |
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313 | } |
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314 | #endif |
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315 | |
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316 | status = rtems_region_return_segment( RTEMS_Malloc_Heap, ptr ); |
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317 | if ( status != RTEMS_SUCCESSFUL ) { |
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318 | errno = EINVAL; |
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319 | assert( 0 ); |
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320 | } |
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321 | } |
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322 | /* end if RTEMS_NEWLIB */ |
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323 | #endif |
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324 | |
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325 | #ifdef MALLOC_STATS |
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326 | /* |
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327 | * Dump the malloc statistics |
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328 | * May be called via atexit() (installable by our bsp) or |
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329 | * at any time by user |
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330 | */ |
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331 | |
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332 | void malloc_dump(void) |
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333 | { |
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334 | unsigned32 allocated = rtems_malloc_stats.lifetime_allocated - |
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335 | rtems_malloc_stats.lifetime_freed; |
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336 | |
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337 | printf("Malloc stats\n"); |
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338 | printf(" avail:%uk allocated:%uk (%d%%) " |
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339 | "max:%uk (%d%%) lifetime:%Luk freed:%Luk\n", |
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340 | (unsigned int) rtems_malloc_stats.space_available / 1024, |
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341 | (unsigned int) allocated / 1024, |
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342 | /* avoid float! */ |
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343 | (allocated * 100) / rtems_malloc_stats.space_available, |
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344 | (unsigned int) rtems_malloc_stats.max_depth / 1024, |
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345 | (rtems_malloc_stats.max_depth * 100) / rtems_malloc_stats.space_available, |
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346 | (unsigned64) rtems_malloc_stats.lifetime_allocated / 1024, |
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347 | (unsigned64) rtems_malloc_stats.lifetime_freed / 1024); |
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348 | printf(" Call counts: malloc:%d free:%d realloc:%d calloc:%d\n", |
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349 | rtems_malloc_stats.malloc_calls, |
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350 | rtems_malloc_stats.free_calls, |
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351 | rtems_malloc_stats.realloc_calls, |
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352 | rtems_malloc_stats.calloc_calls); |
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353 | } |
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354 | |
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355 | |
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356 | void malloc_walk(size_t source, size_t printf_enabled) |
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357 | { |
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358 | register Region_Control *the_region; |
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359 | Objects_Locations location; |
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360 | |
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361 | the_region = _Region_Get( RTEMS_Malloc_Heap, &location ); |
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362 | if ( location == OBJECTS_LOCAL ) |
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363 | { |
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364 | _Heap_Walk( &the_region->Memory, source, printf_enabled ); |
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365 | _Thread_Enable_dispatch(); |
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366 | } |
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367 | } |
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368 | |
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369 | #else |
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370 | |
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371 | void malloc_dump(void) |
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372 | { |
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373 | return; |
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374 | } |
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375 | |
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376 | void malloc_walk(size_t source, size_t printf_enabled) |
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377 | { |
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378 | return; |
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379 | } |
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380 | |
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381 | #endif |
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382 | |
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383 | /* |
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384 | * "Reentrant" versions of the above routines implemented above. |
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385 | */ |
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386 | |
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387 | #ifdef RTEMS_NEWLIB |
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388 | void *_malloc_r( |
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389 | struct _reent *ignored, |
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390 | size_t size |
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391 | ) |
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392 | { |
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393 | return malloc( size ); |
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394 | } |
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395 | |
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396 | void *_calloc_r( |
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397 | struct _reent *ignored, |
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398 | size_t nelem, |
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399 | size_t elsize |
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400 | ) |
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401 | { |
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402 | return calloc( nelem, elsize ); |
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403 | } |
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404 | |
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405 | void *_realloc_r( |
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406 | struct _reent *ignored, |
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407 | void *ptr, |
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408 | size_t size |
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409 | ) |
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410 | { |
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411 | return realloc( ptr, size ); |
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412 | } |
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413 | |
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414 | void _free_r( |
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415 | struct _reent *ignored, |
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416 | void *ptr |
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417 | ) |
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418 | { |
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419 | free( ptr ); |
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420 | } |
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421 | #endif |
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422 | |
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