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annotate packages/hal/arm/arch/current/src/arm.ld @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents 4ca9d5dac8b0
children
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1 //=============================================================================
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2 //
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3 // MLT linker script for ARM
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4 //
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5 //=============================================================================
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6 // ####ECOSGPLCOPYRIGHTBEGIN####
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7 // -------------------------------------------
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8 // This file is part of eCos, the Embedded Configurable Operating System.
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9 // Copyright (C) 1998, 1999, 2000, 2001, 2002, 2005, 2008 Free Software Foundation, Inc.
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10 //
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11 // eCos is free software; you can redistribute it and/or modify it under
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12 // the terms of the GNU General Public License as published by the Free
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13 // Software Foundation; either version 2 or (at your option) any later
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14 // version.
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15 //
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16 // eCos is distributed in the hope that it will be useful, but WITHOUT
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17 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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18 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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19 // for more details.
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20 //
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21 // You should have received a copy of the GNU General Public License
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22 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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23 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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24 //
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25 // As a special exception, if other files instantiate templates or use
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26 // macros or inline functions from this file, or you compile this file
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27 // and link it with other works to produce a work based on this file,
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28 // this file does not by itself cause the resulting work to be covered by
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29 // the GNU General Public License. However the source code for this file
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30 // must still be made available in accordance with section (3) of the GNU
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31 // General Public License v2.
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32 //
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33 // This exception does not invalidate any other reasons why a work based
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34 // on this file might be covered by the GNU General Public License.
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35 // -------------------------------------------
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36 // ####ECOSGPLCOPYRIGHTEND####
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37 //=============================================================================
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38
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39 #include <pkgconf/system.h>
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40 #include <pkgconf/hal.h>
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41
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42 STARTUP(vectors.o)
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43 ENTRY(reset_vector)
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44 INPUT(extras.o)
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45 GROUP( CYGBLD_HAL_LINKER_GROUPED_LIBS )
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47 #if defined(__ARMEB__)
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48 OUTPUT_FORMAT(elf32-bigarm)
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49 #endif
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51 #if defined(CYG_HAL_STARTUP_ROM) \
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52 && defined(CYGPKG_HAL_ARM_PID) \
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53 && defined(__ARMEB__)
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54 // Note: This is only needed when the PID board is used in BE mode without
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55 // the proper ROM controller part.
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56 //
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57 // In big-endian mode, merge .RODATA sections into the .DATA section. This
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58 // causes the data in these sections to be copied to RAM. When the CPU
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59 // makes byte or halfword access to RAM, A0/A1 are modified correctly.
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60 // This does not happen on ROM access (unless the proper ROM controller
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61 // is used).
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62 //
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63 #define MERGE_IN_RODATA *(.rodata*)
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64 #define CYGPRI_PID_BE_WORKAROUND
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65 #else
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66 // Keep RODATA in separate sections.
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67 #define MERGE_IN_RODATA
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68 #undef CYGPRI_PID_BE_WORKAROUND
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69 #endif
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70
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71 // ALIGN_LMA is 4, but the AAPCS now requires that double word types
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72 // be aligned to 8, which means some input sections can be marked as needing
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73 // 8-byte alignment, even text ones (consider literal data).
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74 // This is quite a big backward-compatibility problem for us as a zillion
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75 // platform mlt files for ARM assume that 4-byte alignment is adequate. Really
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76 // this is a bigger problem for the VMA but of course the LMA and VMA have to
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77 // move in sync, since things like .data are just copied as a block. Still,
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78 // ALIGN_LMA as 4 is probably best, but there can be problems with this.
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79
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80 #define ALIGN_LMA 4
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81 #define AAPCS_ALIGN 8
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82 #define FOLLOWING_ALIGNED(_section_, _align_) AT ((LOADADDR (_section_) + SIZEOF (_section_) + (_align_) - 1) & ~ ((_align_) - 1))
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83 #define FOLLOWING(_section_) FOLLOWING_ALIGNED(_section_, ALIGN_LMA)
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84
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85
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86 #define LMA_EQ_VMA
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87 #define FORCE_OUTPUT . = .
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88
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89 // Some versions of gcc define "arm" which causes problems with .note.arm.ident
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90 #undef arm
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91 #define SECTIONS_BEGIN \
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92 /* Debug information */ \
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93 .debug_aranges 0 : { *(.debug_aranges) } \
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94 .debug_pubnames 0 : { *(.debug_pubnames) } \
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95 .debug_info 0 : { *(.debug_info) } \
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96 .debug_abbrev 0 : { *(.debug_abbrev) } \
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97 .debug_line 0 : { *(.debug_line) } \
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98 .debug_frame 0 : { *(.debug_frame) } \
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99 .debug_str 0 : { *(.debug_str) } \
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100 .debug_loc 0 : { *(.debug_loc) } \
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101 .debug_macinfo 0 : { *(.debug_macinfo) } \
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102 .note.arm.ident 0 : { KEEP (*(.note.arm.ident)) } \
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103 /DISCARD/ 0 : { *(.fini_array*) }
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104
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105
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106 // Following not used unless CYGHWR_HAL_ARM_SEPARATE_VSR_TABLE
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107 // defined in hal_platform_setup.h. Otherwise vsr table
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108 // goes in .fixed_vectors.
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109 #define SECTION_hal_vsr_table(_region_, _vma_, _lma_) \
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110 .hal_vsr_table _vma_ : _lma_ \
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111 { FORCE_OUTPUT; KEEP (*(.hal_vsr_table)) } \
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112 > _region_
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113
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114 #define SECTION_fixed_vectors(_region_, _vma_, _lma_) \
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115 .fixed_vectors _vma_ : _lma_ \
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116 { FORCE_OUTPUT; KEEP (*(.fixed_vectors)) } \
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117 > _region_
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118
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119 #define SECTION_rom_vectors(_region_, _vma_, _lma_) \
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120 .rom_vectors _vma_ : _lma_ \
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121 { __rom_vectors_vma = ABSOLUTE(.); \
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122 FORCE_OUTPUT; KEEP (*(.vectors)) } \
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123 > _region_ \
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124 __rom_vectors_lma = LOADADDR(.rom_vectors);
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125
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126 /* The following two sections are used for C++ exception handling
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127 * only and so can be discarded if not used for that.
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128 * These are both included directly from the SECTION_text
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129 * definition and so, for now, are not expected to be listed
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130 * separately in mlt files.
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131 */
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132 #ifdef CYGPKG_LIBSTDCXX
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133 #define SECTION_ARM_extab(_region_, _vma_, _lma_) \
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134 .ARM.extab _vma_ : _lma_ \
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135 { PROVIDE (__stext = ABSOLUTE(.)); _stext = ABSOLUTE(.) ; \
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136 FORCE_OUTPUT; \
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137 *(.ARM.extab* .gnu.linkonce.armextab.*) } > _region_
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138
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139 #define SECTION_ARM_exidx(_region_, _vma_, _lma_) \
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140 . = _vma_; \
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141 . = ALIGN(AAPCS_ALIGN); \
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142 __exidx_start = ABSOLUTE(.); \
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143 .ARM.exidx ALIGN(AAPCS_ALIGN) : _lma_ { \
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144 *(.ARM.exidx* .gnu.linkonce.armexidx.*) \
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145 FORCE_OUTPUT; \
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146 } > _region_ \
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147 __exidx_end = ABSOLUTE(.);
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148
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149 #else
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150 #define SECTION_ARM_extab(_region_, _vma_, _lma_) \
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151 .ARM.extab _vma_ : _lma_ \
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152 { PROVIDE (__stext = ABSOLUTE(.)); _stext = ABSOLUTE(.) ; \
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153 FORCE_OUTPUT; \
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154 } > _region_ \
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155 /DISCARD/ 0 : { *(.ARM.extab* .gnu.linkonce.armextab.*) }
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156
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157 #define SECTION_ARM_exidx(_region_, _vma_, _lma_) \
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158 . = _vma_; \
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159 . = ALIGN(AAPCS_ALIGN); \
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160 __exidx_start = ABSOLUTE(.); \
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161 .ARM.exidx ALIGN(AAPCS_ALIGN) : _lma_ { \
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162 FORCE_OUTPUT; \
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163 } > _region_ \
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164 __exidx_end = ABSOLUTE(.); \
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165 /DISCARD/ 0 : { *(.ARM.exidx* .gnu.linkonce.armexidx.*) }
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166 #endif
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167
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168
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169
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170 // We slot in the .ARM.extab and .ARM.exidx sections first. They
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171 // need to be close to .text due to their relocations which may
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172 // want small offsets - .rodata may be somewhere very different.
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173 // This approach also allows forward compatibility with targets
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174 // which haven't used the EABI before (no new SECTION_xxx definition
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175 // to use).
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176 // One glitch is that the AAPCS can require up to 8-byte alignment
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177 // for double word types. For sections after the first (for which we
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178 // "trust" the MLT files (probably a mistake)), we need to
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179 // ensure the subsequent sections' VMA and LMA move in sync, which
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180 // means keeping the same alignment, and thus since for example literal
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181 // data in .text can require up to 8 byte alignment, the LMA must also
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182 // be 8 byte aligned.
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183
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184 #define SECTION_text(_region_, _vma_, _lma_) \
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185 SECTION_ARM_extab(_region_, _vma_, _lma_) \
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186 SECTION_ARM_exidx(_region_, ALIGN(AAPCS_ALIGN), FOLLOWING_ALIGNED(.ARM.extab, AAPCS_ALIGN)) \
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187 .text ALIGN(AAPCS_ALIGN) : FOLLOWING_ALIGNED(.ARM.exidx, AAPCS_ALIGN) \
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188 { \
208
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189 *(.text*) *(.gnu.warning) *(.gnu.linkonce.t.*) *(.init) \
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190 *(.glue_7) *(.glue_7t) \
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191 __CTOR_LIST__ = ABSOLUTE (.); KEEP (*(SORT (.ctors*))) __CTOR_END__ = ABSOLUTE (.); \
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192 __DTOR_LIST__ = ABSOLUTE (.); KEEP (*(SORT (.dtors*))) __DTOR_END__ = ABSOLUTE (.); \
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193 } > _region_ \
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194 _etext = .; PROVIDE (__etext = .);
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195
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196 #define SECTION_fini(_region_, _vma_, _lma_) \
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197 .fini _vma_ : _lma_ \
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198 { FORCE_OUTPUT; *(.fini) } \
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199 > _region_
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200
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201 #if defined(CYGPRI_PID_BE_WORKAROUND)
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202 #define SECTION_rodata(_region_, _vma_, _lma_)
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203 #define SECTION_rodata1(_region_, _vma_, _lma_)
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204 #else
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205 #define SECTION_rodata(_region_, _vma_, _lma_) \
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206 .rodata _vma_ : _lma_ \
208
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207 { FORCE_OUTPUT; *(.rodata*) *(.gnu.linkonce.r.*) } \
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208 > _region_
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209
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210 #define SECTION_rodata1(_region_, _vma_, _lma_) \
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211 .rodata1 _vma_ : _lma_ \
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212 { FORCE_OUTPUT; *(.rodata1) } \
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213 > _region_
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214 #endif // CYGPRI_PID_BE_WORKAROUND
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215
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216 #define SECTION_fixup(_region_, _vma_, _lma_) \
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217 .fixup _vma_ : _lma_ \
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218 { FORCE_OUTPUT; *(.fixup) } \
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219 > _region_
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220
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221 #ifdef CYGPKG_LIBSTDCXX
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222 /* We want to discard C++ exception frame data if we don't have the
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223 * C++ support to use it. So there are two versions of the section
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224 * definitions for .gcc_except_table and .eh_frame, one which keeps
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225 * them, the other discards.
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226 */
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227 #define SECTION_gcc_except_table(_region_, _vma_, _lma_) \
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228 .gcc_except_table _vma_ : _lma_ \
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229 { FORCE_OUTPUT; \
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230 KEEP(*(.gcc_except_table)) \
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231 *(.gcc_except_table.*) \
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232 } > _region_
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233
184
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234 #define SECTION_eh_frame(_region_, _vma_, _lma_) \
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235 .eh_frame _vma_ : _lma_ \
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236 { \
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237 FORCE_OUTPUT; __EH_FRAME_BEGIN__ = .; \
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238 KEEP(*(.eh_frame)) \
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239 __FRAME_END__ = .; \
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240 . = . + 8; \
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241 } > _region_ = 0
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242 #else
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243 #define SECTION_gcc_except_table(_region_, _vma_, _lma_) \
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244 .gcc_except_table _vma_ : _lma_ \
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245 { FORCE_OUTPUT; \
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246 } > _region_ \
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247 /DISCARD/ 0 : { *(.gcc_except_table*) }
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248
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249 #define SECTION_eh_frame(_region_, _vma_, _lma_) \
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250 .eh_frame _vma_ : _lma_ \
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251 { \
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252 FORCE_OUTPUT; __EH_FRAME_BEGIN__ = .; \
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253 __FRAME_END__ = .; \
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254 } > _region_ \
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255 /DISCARD/ 0 : { *(.eh_frame) }
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256 #endif
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257
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258 #define SECTION_RELOCS(_region_, _vma_, _lma_) \
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259 .rel.text : \
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260 { \
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261 *(.rel.text) \
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262 *(.rel.text.*) \
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263 *(.rel.gnu.linkonce.t*) \
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264 } > _region_ \
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265 .rela.text : \
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266 { \
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267 *(.rela.text) \
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268 *(.rela.text.*) \
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269 *(.rela.gnu.linkonce.t*) \
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270 } > _region_ \
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271 .rel.data : \
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272 { \
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273 *(.rel.data) \
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274 *(.rel.data.*) \
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275 *(.rel.gnu.linkonce.d*) \
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276 } > _region_ \
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277 .rela.data : \
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278 { \
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279 *(.rela.data) \
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280 *(.rela.data.*) \
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281 *(.rela.gnu.linkonce.d*) \
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282 } > _region_ \
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283 .rel.rodata : \
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284 { \
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285 *(.rel.rodata) \
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286 *(.rel.rodata.*) \
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287 *(.rel.gnu.linkonce.r*) \
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288 } > _region_ \
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289 .rela.rodata : \
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290 { \
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291 *(.rela.rodata) \
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292 *(.rela.rodata.*) \
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293 *(.rela.gnu.linkonce.r*) \
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294 } > _region_ \
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295 .rel.got : { *(.rel.got) } > _region_ \
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296 .rela.got : { *(.rela.got) } > _region_ \
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297 .rel.ctors : { *(.rel.ctors) } > _region_ \
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298 .rela.ctors : { *(.rela.ctors) } > _region_ \
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299 .rel.dtors : { *(.rel.dtors) } > _region_ \
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300 .rela.dtors : { *(.rela.dtors) } > _region_ \
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301 .rel.init : { *(.rel.init) } > _region_ \
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302 .rela.init : { *(.rela.init) } > _region_ \
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303 .rel.fini : { *(.rel.fini) } > _region_ \
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304 .rela.fini : { *(.rela.fini) } > _region_ \
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305 .rel.bss : { *(.rel.bss) } > _region_ \
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306 .rela.bss : { *(.rela.bss) } > _region_ \
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307 .rel.plt : { *(.rel.plt) } > _region_ \
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308 .rela.plt : { *(.rela.plt) } > _region_ \
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309 .rel.dyn : { *(.rel.dyn) } > _region_
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310
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311 #define SECTION_got(_region_, _vma_, _lma_) \
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312 .got _vma_ : _lma_ \
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313 { \
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314 FORCE_OUTPUT; *(.got.plt) *(.got) \
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315 _GOT1_START_ = ABSOLUTE (.); *(.got1) _GOT1_END_ = ABSOLUTE (.); \
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316 _GOT2_START_ = ABSOLUTE (.); *(.got2) _GOT2_END_ = ABSOLUTE (.); \
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317 } > _region_
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318
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319 #define SECTION_mmu_tables(_region_, _vma_, _lma_) \
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320 .mmu_tables _vma_ : _lma_ \
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321 { FORCE_OUTPUT; *(.mmu_tables) } \
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322 > _region_
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323
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324 #define SECTION_sram(_region_, _vma_, _lma_) \
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325 .sram _vma_ : _lma_ \
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326 { FORCE_OUTPUT; *(.sram*) } \
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327 > _region_
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328
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329 #define SECTION_data(_region_, _vma_, _lma_) \
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330 .data _vma_ : _lma_ \
208
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331 { __ram_data_start = ABSOLUTE (.); \
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332 *(.data*) *(.data1) *(.gnu.linkonce.d.*) MERGE_IN_RODATA \
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333 . = ALIGN (4); \
115
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334 KEEP(*( SORT (.ecos.table.*))) ; \
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335 . = ALIGN (4); \
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336 __init_array_start__ = ABSOLUTE (.); KEEP (*(SORT (.init_array.*))) \
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337 KEEP (*(SORT (.init_array))) __init_array_end__ = ABSOLUTE (.); \
208
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338 *(.dynamic) *(.sdata*) *(.gnu.linkonce.s.*) \
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339 . = ALIGN (4); *(.2ram.*) } \
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340 > _region_ \
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341 __rom_data_start = LOADADDR (.data); \
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342 __ram_data_end = .; PROVIDE (__ram_data_end = .); _edata = .; PROVIDE (edata = .); \
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343 PROVIDE (__rom_data_end = LOADADDR (.data) + SIZEOF(.data));
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344
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345 #define SECTION_bss(_region_, _vma_, _lma_) \
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346 .bss _vma_ : _lma_ \
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347 { __bss_start = ABSOLUTE (.); \
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348 *(.scommon) *(.dynsbss) *(.sbss*) *(.gnu.linkonce.sb.*) \
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349 *(.dynbss) *(.bss*) *(.gnu.linkonce.b.*) *(COMMON) \
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350 __bss_end = ABSOLUTE (.); } \
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351 > _region_
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352
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353 #define SECTIONS_END . = ALIGN(4); _end = .; PROVIDE (end = .);
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354
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355 #include <pkgconf/hal_arm.h>
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356 #include CYGHWR_MEMORY_LAYOUT_LDI