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annotate packages/services/loader/current/include/loader.hxx @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents 022f1e506033
children d2c90368aeef
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1 #ifndef CYGONCE_LOADER_LOADER_HXX
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2 #define CYGONCE_LOADER_LOADER_HXX
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3
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4 //==========================================================================
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5 //
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6 // loader.hxx
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7 //
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8 // ELF dynamic loader definitions
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9 //
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10 //==========================================================================
208
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11 //####ECOSGPLCOPYRIGHTBEGIN####
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12 // -------------------------------------------
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13 // This file is part of eCos, the Embedded Configurable Operating System.
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14 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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15 //
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16 // eCos is free software; you can redistribute it and/or modify it under
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17 // the terms of the GNU General Public License as published by the Free
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18 // Software Foundation; either version 2 or (at your option) any later version.
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19 //
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20 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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21 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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22 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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23 // for more details.
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24 //
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25 // You should have received a copy of the GNU General Public License along
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26 // with eCos; if not, write to the Free Software Foundation, Inc.,
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27 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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28 //
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29 // As a special exception, if other files instantiate templates or use macros
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30 // or inline functions from this file, or you compile this file and link it
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31 // with other works to produce a work based on this file, this file does not
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32 // by itself cause the resulting work to be covered by the GNU General Public
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33 // License. However the source code for this file must still be made available
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34 // in accordance with section (3) of the GNU General Public License.
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35 //
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36 // This exception does not invalidate any other reasons why a work based on
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37 // this file might be covered by the GNU General Public License.
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38 //
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39 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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40 // at http://sources.redhat.com/ecos/ecos-license
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41 // -------------------------------------------
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42 //####ECOSGPLCOPYRIGHTEND####
184
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43 //==========================================================================
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44 //#####DESCRIPTIONBEGIN####
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45 //
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46 // Author(s): nickg
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47 // Contributors: nickg
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48 // Date: 2000-11-15
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49 // Purpose: Define ELF dynamic loader
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50 // Description: The classes defined here collectively implement the
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51 // internal API of the ELF dynamic loader.
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52 // Usage: #include <cyg/loader/loader.hxx>
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53 //
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54 //####DESCRIPTIONEND####
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55 //
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56 //==========================================================================
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57
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58 #include <pkgconf/system.h>
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59
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60 #ifndef CYG_LOADER_DYNAMIC_LD
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61
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62 #include <cyg/loader/elf.h> // ELF data structures
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63
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64 #ifdef __cplusplus
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65
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66 #include <cyg/kernel/ktypes.h>
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67 #include <cyg/infra/cyg_ass.h> // assertion macros
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68
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69 #include <cyg/infra/clist.hxx>
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70
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71 // -------------------------------------------------------------------------
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72 // Forward definitions
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73
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74 class Cyg_LoaderStream;
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75 class Cyg_LoaderMemBlock;
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76 class Cyg_LoaderMemAlloc;
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77 class Cyg_LoadObject_Base;
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78 class Cyg_LoadObject_Proc;
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79 class Cyg_LoadObject;
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80 class Cyg_Loader;
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81
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82 // -------------------------------------------------------------------------
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83 // Error codes
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84
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85 #define CYG_LOADERR_NOERROR 0 // No error
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86 #define CYG_LOADERR_NOT_ELF 1 // Not ELF format file
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87 #define CYG_LOADERR_INVALID_CLASS 2 // Not expected file class
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88 #define CYG_LOADERR_INVALID_BYTEORDER 3 // Not expected byte order
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89 #define CYG_LOADERR_INVALID_VERSION 4 // Not expected ELF version
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90 #define CYG_LOADERR_INVALID_MACHINE 5 // Not expected machine type
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91 #define CYG_LOADERR_NO_MEMORY 6 // No memory
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92 #define CYG_LOADERR_EOF 7 // End of input stream
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93 #define CYG_LOADERR_SEEK 8 // Cannot seek to stream position
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94 #define CYG_LOADERR_INVALID_RELOC 9 // Invalid or unexpected relocation
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95 #define CYG_LOADERR_NO_HASHTABLE 10 // No hash table in ELF file
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96 #define CYG_LOADERR_NO_SYMTAB 11 // No symbol table in ELF file
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97 #define CYG_LOADERR_NO_STRTAB 12 // No srting table in ELF file
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98 #define CYG_LOADERR_NO_SYMBOL 13 // Symbol not found
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99
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100 // -------------------------------------------------------------------------
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101 // Value for undefined or otherwise invalid symbol addresses.
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102
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103 #define CYG_LOADER_NULLSYMADDR 0
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104
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105 // -------------------------------------------------------------------------
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106 // Loader Stream base class.
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107 // This defines the interface to data streams that are ELF dynamic executable
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108 // files.
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109
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110 class Cyg_LoaderStream
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111 {
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112 public:
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113
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114 Cyg_LoaderStream(); // Constructor
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115
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116 virtual ~Cyg_LoaderStream(); // Destructor
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117
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118
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119 // The following functions are virtual and are supplied by a
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120 // derived class to access to data stream.
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121
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122 virtual cyg_code get_byte(CYG_BYTE *val); // Get a byte from the stream
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123
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124 virtual cyg_code get_data(CYG_BYTE *addr, CYG_ADDRWORD size);
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125
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126 virtual cyg_code seek(CYG_ADDRWORD pos); // seek to given position
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127
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128 // The following functions all make use of the virtual functions
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129 // to access the data stream.
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130
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131 cyg_code get_word16(CYG_WORD16 *val); // get a 16 bit value
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132
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133 cyg_code get_word32(CYG_WORD32 *val); // get a 32 bit value
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134
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135 cyg_code get_word64(CYG_WORD64 *val); // get a 64 bit value
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136 };
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137
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138 // -------------------------------------------------------------------------
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139 // Memory allocation object. All memory allocated by the Loader is described
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140 // by one of these.
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141
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142 struct Cyg_LoaderMemBlock
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143 : public Cyg_DNode_T<Cyg_LoaderMemBlock>
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144 {
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145 void *address; // data address
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146 cyg_int32 size; // block size
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147 cyg_int32 alignment; // block alignment
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148 Cyg_LoaderMemAlloc *mem; // allocator used
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149 CYG_ADDRESS actual_address; // allocator specific actual address for block
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150 CYG_WORD32 actual_size; // allocator specific actual size for block
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151
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152 // Convenience free() function
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153 void free();
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154 };
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155
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156 // -------------------------------------------------------------------------
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157 // Memory allocator base class
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158 // This defines the interface to a memory allocator used by the loader.
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159
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160 class Cyg_LoaderMemAlloc
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161 {
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162
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163 public:
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164
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165 Cyg_LoaderMemAlloc();
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166
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167 virtual ~Cyg_LoaderMemAlloc();
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168
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169 // The following functions are virtual so that alternative memory
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170 // allocators may be implemented. The default behaviour of this
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171 // class is to use malloc/realloc/free to support these functions.
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172
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173 // Allocate memory of the supplied size and alignment.
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174 // size - size in bytes
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175 // alignment - alignment expressed as a power of 2
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176 // defaults to 8 byte alignment
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177 virtual Cyg_LoaderMemBlock *alloc( cyg_int32 size,
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178 cyg_int32 alignment = 8);
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179
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180 // Reallocate block
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181 // block - block to reallocate
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182 // size - new size in bytes
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183 // alignment - new alignment, -1 if old alignment is to be used.
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184 virtual Cyg_LoaderMemBlock *realloc( Cyg_LoaderMemBlock *block,
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185 cyg_int32 size,
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186 cyg_int32 alignment = -1);
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187
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188 // Free a previously allocated memory segment.
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189 virtual void free( Cyg_LoaderMemBlock *block );
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190
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191 };
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192
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193 // -------------------------------------------------------------------------
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194 // Cyg_LoaderMemBlock convenience free() function implementation.
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195
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196 inline void Cyg_LoaderMemBlock::free() { mem->free(this); };
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197
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198 // -------------------------------------------------------------------------
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199 // A loaded object
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200
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201 class Cyg_LoadObject_Base
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202 : public Cyg_DNode_T<Cyg_LoadObject>
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203 {
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204 friend class Cyg_Loader;
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205
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206 protected:
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207 // The following fields come from the constructor arguments
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208
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209 cyg_uint32 mode; // mode flags
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210
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211 Cyg_LoaderMemAlloc *memalloc; // Memory allocator
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212
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213
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214 // The following fields are derived from the ELF header
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215
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216 Elf32_Word e_type; // File type
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217
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218 Elf32_Addr e_entry; // Executable entry point
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219
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220
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221
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222 // The following fields are derived from the PT_DYNAMIC segment in
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223 // the program header. These fields are named after the DT_ tags
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224 // that their values are derived from.
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225
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226 Elf32_Word flags; // flags from DT_FLAGS
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227
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228 Elf32_Word soname; // name of module, if defined
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229
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230 Elf_Hash *hash; // address of hash table
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231 Elf32_Word *bucket; // derived bucket array address
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232 Elf32_Word *chain; // derived chain array address
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233
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234 // String table
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235 unsigned char *strtab; // address of table
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236 Elf32_Word strsize; // size of table in bytes
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237
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238 // Symbol table
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239 Elf32_Sym *symtab; // address of table
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240 Elf32_Word syment; // size of entry
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241
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242 // PTL and GOT
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243 Elf32_Addr pltgot; // address of PLT and/or GOT
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244
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245 // PLT relocation entries
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246 Elf32_Addr jmprel; // address of relocation table
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247 Elf32_Word pltrelsz; // size of jmprel table in bytes
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248 Elf32_Word pltrel; // type of table entries: DT_REL
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249 // or DT_RELA
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250
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251 // Relocation table with implicit addends
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252 Elf32_Rel *rel; // table address
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253 Elf32_Word relsize; // table size in bytes
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254 Elf32_Word relent; // size of entry
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255
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256 // Relocation table with explicit addends
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257 Elf32_Rela *rela; // table address
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258 Elf32_Word relasize; // table size in bytes
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259 Elf32_Word relaent; // size of entry
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260
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261 // Init and Fini support
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262 Elf32_Addr init; // address of init function
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263 Elf32_Addr fini; // address of fini function
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264 Elf32_Addr *init_array; // address of init array
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265 Elf32_Word init_array_sz; // size of init array
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266 Elf32_Addr *fini_array; // address of fini array
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267 Elf32_Word fini_array_sz; // size of fini array
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268 Elf32_Addr *pre_init_array; // address of pre_init array
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269 Elf32_Word pre_init_array_sz; // size of pre_init array
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270
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271 Elf32_Dyn *dynamic; // address of _DYNAMIC section
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272
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273 CYG_ADDRESS base; // base address used in address and
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274 // relocation calcualtions
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275
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276 Cyg_CList_T<Cyg_LoaderMemBlock> segs; // chain of loaded segments
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277
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278 cyg_code error; // most recent error code
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279
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280
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281 // private functions
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282
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283 void parse_dynamic( Elf32_Dyn *dynamic );
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284
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285 // Translate a symbol from its symbol table index into its
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286 // actual address
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287
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288 CYG_ADDRESS get_sym_addr_from_ix( Elf32_Word sym );
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289
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290 // Get a symbol from this object's symbol table.
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291 Elf32_Sym *get_sym( Elf32_Word ix );
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292
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293 // Get a name from this object's string table.
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294 char *get_name( Elf32_Word offset );
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295
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296 // Look up the name in the hash table and return its symbol
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297 // table entry, or NULL if not found.
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298 Elf32_Sym *hash_lookup( const char *name );
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299
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300
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301 // Look up the name in the hash table and return its absolute
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302 // address or CYG_LOADER_NULLSYMADDR if it is not found.
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303 CYG_ADDRESS hash_lookup_addr( const char *name );
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304
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305 // Standard ELF-defined hash function for symbol table.
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306 static unsigned long elf_hash( const unsigned char *name );
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307
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308 public:
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309
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310 // Constructor - reads and allocates the executable.
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311
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312 Cyg_LoadObject_Base();
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313
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314 Cyg_LoadObject_Base( Cyg_LoaderStream& stream,
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315 cyg_uint32 mode,
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316 Cyg_LoaderMemAlloc *mem );
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317
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318 ~Cyg_LoadObject_Base(); // Destructor
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319
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320 inline cyg_code get_error() { return error; };
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321
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322 // Translate a symbol into its address.
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323 void *symbol( const char *name );
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324
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325 // Start this executable running
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326 cyg_code exec(int argc, char **argv, char **envv);
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327 };
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328
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329 #endif // __cplusplus
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330
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331 #endif // CYG_LOADER_DYNAMIC_LD
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332
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333 // -------------------------------------------------------------------------
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334 // All the following files should have suitable ifdefs so that only
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335 // one actually provides content.
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336
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337 #include <cyg/loader/mips_elf.h> // MIPS ELF support
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338 #include <cyg/loader/arm_elf.h> // ARM ELF support
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339 #include <cyg/loader/i386_elf.h> // i386 ELF support
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340 #include <cyg/loader/ppc_elf.h> // PowerPC ELF support
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341 //#include <cyg/loader/sparc_elf.h> // Sparc ELF support
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342 //#include <cyg/loader/sh_elf.h> // SH ELF support
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343
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344 // -------------------------------------------------------------------------
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345
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346 #ifndef CYG_LOADER_DYNAMIC_LD
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347
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348 #ifdef __cplusplus
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349
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350 class Cyg_LoadObject :
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351 public Cyg_LoadObject_Proc
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352 {
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353 Cyg_LoaderMemBlock *block;
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354
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355 public:
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356
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357 inline Cyg_LoadObject()
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358 : Cyg_LoadObject_Proc()
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359 {
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360 };
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361
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362 inline Cyg_LoadObject( Cyg_LoaderStream& stream,
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363 cyg_uint32 mode,
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364 Cyg_LoaderMemAlloc *mem,
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365 Cyg_LoaderMemBlock *ablock = NULL)
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366 : Cyg_LoadObject_Proc( stream, mode, mem )
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367 {
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368 block = ablock;
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369 };
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370
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371 inline ~Cyg_LoadObject() {};
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372
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373 Cyg_LoaderMemBlock *get_block() { return block; };
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374
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375 // Apply dynamic relocations to the executable
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376 void relocate();
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377
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378 // Apply PLT relocations
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379 void relocate_plt();
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380 };
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381
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382 // -------------------------------------------------------------------------
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383 // Main loader class
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384
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385 class Cyg_Loader
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386 {
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387 // current error code.
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388 cyg_code error;
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389
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390 // Default memory allocator.
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391 Cyg_LoaderMemAlloc *mem_default;
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392
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393 // Load object for main program
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394 Cyg_LoadObject *main;
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395
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396 // List of loaded executables, including the main
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397 // program and all libraries.
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398 Cyg_CList_T<Cyg_LoadObject> loadlist;
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399
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400 public:
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401
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402 Cyg_Loader( Cyg_LoaderMemAlloc *mem); // Constructor
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403
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404 ~Cyg_Loader(); // Destructor
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405
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406
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407 // Load an object and all its dependencies.
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408 cyg_code load( Cyg_LoaderStream& stream,
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409 cyg_uint32 mode,
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410 Cyg_LoadObject **object);
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411
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412 // Close an object and remove it from memory
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413 cyg_code close( Cyg_LoadObject *object );
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414
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415 // Translate current error code into a string.
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416 const char *error_string( );
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417
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418 // Look up a symbol
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419 Elf32_Sym *hash_lookup( const char *name );
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420
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421 // look up a named symbol in loadlist and return its
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422 // address relocated to its load address.
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423 CYG_ADDRESS hash_lookup_addr( const char *name );
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424
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425 // Static pointer to loader object
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426 static Cyg_Loader *loader;
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427 };
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428
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429 //==========================================================================
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430 // Memory based loader stream
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431
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432 class Cyg_LoaderStream_Mem
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433 : public Cyg_LoaderStream
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434 {
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435 CYG_ADDRESS base;
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436 CYG_ADDRESS pos;
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437 CYG_ADDRESS end;
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438
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439 public:
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440
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441 Cyg_LoaderStream_Mem( const void *addr, cyg_int32 size );
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442
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443 ~Cyg_LoaderStream_Mem(); // Destructor
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444
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445 cyg_code get_byte(CYG_BYTE *val); // Get a byte from the stream
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446
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447 cyg_code get_data(CYG_BYTE *addr, CYG_ADDRWORD size);
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448
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449 cyg_code seek(CYG_ADDRWORD pos); // seek to given position
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450
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451 };
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452
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453 //==========================================================================
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454 // Fileio based loader stream
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455
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456 #ifdef CYGPKG_IO_FILEIO
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457
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458 class Cyg_LoaderStream_File
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459 : public Cyg_LoaderStream
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460 {
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461 int fd;
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462
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463 public:
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464
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465 Cyg_LoaderStream_File( int afd );
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466
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467 ~Cyg_LoaderStream_File(); // Destructor
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468
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469 cyg_code get_byte(CYG_BYTE *val); // Get a byte from the stream
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470
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471 cyg_code get_data(CYG_BYTE *addr, CYG_ADDRWORD size);
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472
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473 cyg_code seek(CYG_ADDRWORD pos); // seek to given position
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474
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475 };
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476
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477 #endif
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478
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479 // -------------------------------------------------------------------------
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480
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481 #endif // __cplusplus
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482
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483 #endif // CYG_LOADER_DYNAMIC_LD
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484
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485 // -------------------------------------------------------------------------
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486 #endif // ifndef CYGONCE_LOADER_LOADER_HXX
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487 // EOF loader.hxx