1 | /* |
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2 | * Taken from NetBSD and stripped of the relocations not needed on RTEMS. |
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3 | */ |
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4 | |
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5 | /* $NetBSD: mdreloc.c,v 1.14 2020/06/16 21:01:30 joerg Exp $ */ |
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6 | |
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7 | /*- |
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8 | * Copyright (c) 2014 The NetBSD Foundation, Inc. |
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9 | * All rights reserved. |
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10 | * |
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11 | * This code is derived from software contributed to The NetBSD Foundation |
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12 | * by Matt Thomas of 3am Software Foundry. |
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13 | * |
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14 | * Redistribution and use in source and binary forms, with or without |
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15 | * modification, are permitted provided that the following conditions |
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16 | * are met: |
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17 | * 1. Redistributions of source code must retain the above copyright |
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18 | * notice, this list of conditions and the following disclaimer. |
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19 | * 2. Redistributions in binary form must reproduce the above copyright |
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20 | * notice, this list of conditions and the following disclaimer in the |
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21 | * documentation and/or other materials provided with the distribution. |
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22 | * |
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23 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
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24 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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25 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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26 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
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27 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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28 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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29 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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30 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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31 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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32 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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33 | * POSSIBILITY OF SUCH DAMAGE. |
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34 | */ |
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35 | |
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36 | /*- |
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37 | * Copyright (c) 2014-2015 The FreeBSD Foundation |
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38 | * All rights reserved. |
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39 | * |
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40 | * Portions of this software were developed by Andrew Turner |
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41 | * under sponsorship from the FreeBSD Foundation. |
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42 | * |
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43 | * Redistribution and use in source and binary forms, with or without |
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44 | * modification, are permitted provided that the following conditions |
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45 | * are met: |
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46 | * 1. Redistributions of source code must retain the above copyright |
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47 | * notice, this list of conditions and the following disclaimer. |
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48 | * 2. Redistributions in binary form must reproduce the above copyright |
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49 | * notice, this list of conditions and the following disclaimer in the |
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50 | * documentation and/or other materials provided with the distribution. |
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51 | * |
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52 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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53 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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54 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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55 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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56 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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57 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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58 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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59 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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60 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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61 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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62 | * SUCH DAMAGE. |
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63 | */ |
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64 | |
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65 | #include <sys/cdefs.h> |
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66 | #ifndef lint |
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67 | __RCSID("$NetBSD: mdreloc.c,v 1.14 2020/06/16 21:01:30 joerg Exp $"); |
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68 | #endif /* not lint */ |
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69 | |
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70 | #include <sys/types.h> |
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71 | #include <string.h> |
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72 | #include <errno.h> |
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73 | #include <inttypes.h> |
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74 | #include <sys/stat.h> |
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75 | #include <sys/endian.h> |
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76 | #include <unwind.h> |
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77 | |
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78 | #include <rtems/rtl/rtl.h> |
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79 | #include "rtl-elf.h" |
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80 | #include "rtl-error.h" |
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81 | #include <rtems/rtl/rtl-trace.h> |
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82 | #include "rtl-unwind.h" |
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83 | |
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84 | typedef unsigned _Unwind_Word __attribute__((__mode__(__word__))); |
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85 | typedef _Unwind_Word _uw; |
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86 | |
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87 | struct tls_data { |
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88 | size_t td_tlsindex; |
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89 | Elf_Addr td_tlsoffs; |
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90 | }; |
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91 | |
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92 | rtems_rtl_elf_rel_status |
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93 | rtems_rtl_elf_reloc_rela ( |
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94 | rtems_rtl_obj* obj, |
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95 | const Elf_Rela* rela, |
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96 | const rtems_rtl_obj_sect* sect, |
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97 | const char* symname, |
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98 | const Elf_Byte syminfo, |
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99 | const Elf_Word symvalue, |
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100 | const bool parsing |
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101 | ); |
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102 | |
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103 | #define __BITS(hi,lo) ((~((~(Elf_Addr)0)<<((hi)+1)))&((~(Elf_Addr)0)<<(lo))) |
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104 | #define WIDTHMASK(w) (0xffffffffffffffffUL >> (64 - (w))) |
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105 | |
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106 | static inline bool |
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107 | checkoverflow(Elf_Addr addr, int bitwidth, Elf_Addr targetaddr, |
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108 | const char *bitscale, void *where, Elf64_Addr off) |
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109 | { |
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110 | const Elf_Addr mask = ~__BITS(bitwidth - 1, 0); |
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111 | |
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112 | if (((addr & mask) != 0) && ((addr & mask) != mask)) { |
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113 | printf("kobj_reloc: Relocation 0x%jx too far from %p" |
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114 | " (base+0x%jx) for %dbit%s\n", |
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115 | (uintptr_t)targetaddr, where, off, bitwidth, bitscale); |
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116 | return true; |
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117 | } |
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118 | |
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119 | return false; |
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120 | } |
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121 | |
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122 | static inline bool |
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123 | checkalign(Elf_Addr addr, int alignbyte, void *where, Elf64_Addr off) |
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124 | { |
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125 | if ((addr & (alignbyte - 1)) != 0) { |
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126 | printf("kobj_reloc: Relocation 0x%jx unaligned at %p" |
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127 | " (base+0x%jx). must be aligned %d\n", |
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128 | (uintptr_t)addr, where, off, alignbyte); |
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129 | return true; |
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130 | } |
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131 | return false; |
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132 | } |
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133 | |
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134 | /* |
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135 | * Set to 1 to allow untested relocations. If you tested one and it |
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136 | * works or you fixed the relocation please remove the guard. |
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137 | */ |
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138 | #define ALLOW_UNTESTED_RELOCS 1 |
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139 | |
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140 | static void* |
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141 | set_veneer(void* tramopline, Elf_Addr target) |
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142 | { |
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143 | /* |
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144 | * http://shell-storm.org/online/Online-Assembler-and-Disassembler/ |
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145 | * |
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146 | * ldr x9, #8 |
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147 | * br x9 |
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148 | * |
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149 | */ |
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150 | uint64_t* tramp = (uint64_t*) tramopline; |
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151 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
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152 | *tramp++ = 0xd61f012058000049; |
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153 | #else |
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154 | *tramp++ = 0xd61f012058000049; /* not tested */ |
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155 | #endif |
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156 | *tramp++ = (uint64_t) target; |
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157 | return tramp; |
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158 | } |
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159 | |
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160 | static size_t |
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161 | get_veneer_size(int type) |
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162 | { |
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163 | (void) type; |
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164 | return 16; |
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165 | } |
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166 | |
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167 | size_t |
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168 | rtems_rtl_elf_relocate_tramp_max_size (void) |
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169 | { |
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170 | return 16; |
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171 | } |
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172 | |
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173 | uint32_t |
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174 | rtems_rtl_elf_section_flags (const rtems_rtl_obj* obj, |
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175 | const Elf_Shdr* shdr) |
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176 | { |
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177 | return 0; |
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178 | } |
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179 | |
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180 | uint32_t |
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181 | rtems_rtl_elf_arch_parse_section (const rtems_rtl_obj* obj, |
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182 | int section, |
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183 | const char* name, |
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184 | const Elf_Shdr* shdr, |
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185 | const uint32_t flags) |
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186 | { |
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187 | (void) obj; |
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188 | (void) section; |
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189 | (void) name; |
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190 | (void) shdr; |
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191 | return flags; |
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192 | } |
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193 | |
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194 | bool |
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195 | rtems_rtl_elf_arch_section_alloc (const rtems_rtl_obj* obj, |
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196 | rtems_rtl_obj_sect* sect) |
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197 | { |
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198 | (void) obj; |
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199 | (void) sect; |
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200 | return false; |
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201 | } |
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202 | |
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203 | bool |
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204 | rtems_rtl_elf_arch_section_free (const rtems_rtl_obj* obj, |
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205 | rtems_rtl_obj_sect* sect) |
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206 | { |
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207 | (void) obj; |
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208 | (void) sect; |
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209 | return false; |
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210 | } |
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211 | |
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212 | bool |
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213 | rtems_rtl_elf_rel_resolve_sym (Elf_Word type) |
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214 | { |
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215 | return true; |
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216 | } |
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217 | |
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218 | rtems_rtl_elf_rel_status |
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219 | rtems_rtl_elf_reloc_rela (rtems_rtl_obj* obj, |
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220 | const Elf_Rela* rela, |
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221 | const rtems_rtl_obj_sect* sect, |
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222 | const char* symname, |
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223 | const Elf_Byte syminfo, |
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224 | const Elf_Word symvalue, |
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225 | const bool parsing) |
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226 | { |
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227 | Elf64_Addr *where; |
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228 | Elf32_Addr *where32; |
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229 | Elf_Addr off = rela->r_offset; |
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230 | Elf_Addr target; |
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231 | Elf_Addr raddr; |
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232 | uint32_t *insn, immhi, immlo, shift; |
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233 | |
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234 | where = (Elf_Addr *)(sect->base + rela->r_offset); |
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235 | where32 = (void *)where; |
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236 | |
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237 | insn = (uint32_t *)where; |
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238 | |
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239 | /* |
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240 | * S - the address of the symbol |
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241 | * A - the addend of the reolcation |
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242 | * P - the address of the place being relocated (derived from r_offset) |
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243 | * Page(expr) - the page address of the expression expr, defined as (expr & ~0xFFF). |
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244 | */ |
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245 | switch (ELF_R_TYPE(rela->r_info)) { |
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246 | case R_TYPE(NONE): |
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247 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) { |
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248 | printf ("rtl: NONE %p in %s\n", where, rtems_rtl_obj_oname (obj)); |
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249 | } |
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250 | break; |
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251 | |
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252 | case R_TYPE(ABS64): /* word S + A */ |
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253 | case R_TYPE(GLOB_DAT): /* word S + A */ |
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254 | if (!parsing) { |
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255 | target = (Elf_Addr)symvalue + rela->r_addend; |
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256 | |
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257 | if (*where != target) |
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258 | *where = target; |
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259 | |
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260 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
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261 | printf ("rtl: reloc 64/GLOB_DAT in %s --> %p in %s\n", |
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262 | sect->name, (void *)*where, |
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263 | rtems_rtl_obj_oname (obj)); |
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264 | } |
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265 | break; |
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266 | |
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267 | /* |
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268 | * If S is a normal symbol, resolves to the difference between the static |
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269 | * link address of S and the execution address of S. If S is the null symbol |
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270 | * (ELF symbol index 0), resolves to the difference between the static link |
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271 | * address of P and the execution address of P. |
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272 | */ |
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273 | case R_TYPE(RELATIVE): /* Delta(S) + A */ |
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274 | if (!parsing) { |
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275 | *where = (Elf_Addr)(sect->base + rela->r_addend); |
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276 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
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277 | printf ("rtl: reloc RELATIVE in %s --> %p in %s\n", |
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278 | sect->name, (void *)*where, |
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279 | rtems_rtl_obj_oname (obj)); |
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280 | } |
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281 | break; |
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282 | |
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283 | case R_TYPE(COPY): |
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284 | /* |
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285 | * These are deferred until all other relocations have |
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286 | * been done. All we do here is make sure that the |
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287 | * COPY relocation is not in a shared library. They |
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288 | * are allowed only in executable files. |
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289 | */ |
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290 | printf("rtl: reloc COPY (please report)\n"); |
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291 | break; |
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292 | |
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293 | case R_AARCH64_ADD_ABS_LO12_NC: /* S + A */ |
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294 | case R_AARCH64_LDST8_ABS_LO12_NC: |
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295 | case R_AARCH_LDST16_ABS_LO12_NC: |
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296 | case R_AARCH_LDST32_ABS_LO12_NC: |
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297 | case R_AARCH_LDST64_ABS_LO12_NC: |
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298 | switch (ELF_R_TYPE(rela->r_info)) { |
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299 | case R_AARCH64_ADD_ABS_LO12_NC: |
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300 | case R_AARCH64_LDST8_ABS_LO12_NC: |
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301 | shift = 0; |
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302 | break; |
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303 | case R_AARCH_LDST16_ABS_LO12_NC: |
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304 | shift = 1; |
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305 | break; |
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306 | case R_AARCH_LDST32_ABS_LO12_NC: |
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307 | shift = 2; |
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308 | break; |
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309 | case R_AARCH_LDST64_ABS_LO12_NC: |
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310 | shift = 3; |
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311 | break; |
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312 | default: |
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313 | printf("illegal rtype: %ld\n", ELF_R_TYPE(rela->r_info)); |
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314 | break; |
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315 | } |
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316 | |
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317 | /* |
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318 | * S + A |
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319 | * e.g.) add x0,x0,#:lo12:<sym>+<addend> |
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320 | * ldrb w0,[x0,#:lo12:<sym>+<addend>] |
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321 | * ldrh w0,[x0,#:lo12:<sym>+<addend>] |
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322 | * ldr w0,[x0,#:lo12:<sym>+<addend>] |
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323 | * ldr x0,[x0,#:lo12:<sym>+<addend>] |
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324 | */ |
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325 | if (!parsing) { |
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326 | target = (Elf_Addr)symvalue + rela->r_addend; |
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327 | if (checkalign(target, 1 << shift, where, off)) { |
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328 | printf ("rtl: reloc checkalign failed in %s --> %p in %s\n", |
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329 | sect->name, (void *)*where, |
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330 | rtems_rtl_obj_oname (obj)); |
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331 | printf("ELF_R_TYPE is : %ld\n", ELF_R_TYPE(rela->r_info)); |
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332 | break; |
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333 | } |
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334 | target &= WIDTHMASK(12); |
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335 | target >>= shift; |
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336 | *insn = htole32( |
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337 | (le32toh(*insn) & ~__BITS(21,10)) | (target << 10)); |
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338 | } |
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339 | break; |
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340 | |
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341 | case R_AARCH64_ADR_PREL_PG_HI21: |
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342 | /* |
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343 | * Page(S + A) - Page(P) |
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344 | * e.g.) adrp x0,<sym>+<addend> |
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345 | */ |
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346 | if (!parsing) { |
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347 | target = (Elf_Addr)symvalue + rela->r_addend; |
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348 | target = target >> 12; |
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349 | raddr = target << 12; |
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350 | target -= (uintptr_t)where >> 12; |
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351 | |
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352 | if (checkoverflow(target, 21, raddr, " x 4k", where, off)) { |
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353 | return rtems_rtl_elf_rel_failure; |
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354 | } |
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355 | |
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356 | immlo = target & WIDTHMASK(2); |
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357 | immhi = (target >> 2) & WIDTHMASK(19); |
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358 | *insn = htole32((le32toh(*insn) & |
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359 | ~(__BITS(30,29) | __BITS(23,5))) | |
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360 | (immlo << 29) | (immhi << 5)); |
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361 | } |
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362 | break; |
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363 | |
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364 | case R_AARCH_JUMP26: |
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365 | case R_AARCH_CALL26: |
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366 | /* |
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367 | * S + A - P |
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368 | * e.g.) b <sym>+<addend> |
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369 | * bl <sym>+<addend> |
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370 | */ |
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371 | if (parsing && sect->base == 0) { |
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372 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
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373 | printf ("rtl: JUMP26/PC26/CALL tramp cache\n"); |
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374 | return rtems_rtl_elf_rel_tramp_cache; |
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375 | } |
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376 | |
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377 | raddr = (Elf_Addr)symvalue + rela->r_addend; |
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378 | target = raddr - (uintptr_t)where; |
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379 | if (checkalign(target, 4, where, off)) { |
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380 | return rtems_rtl_elf_rel_failure; |
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381 | } |
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382 | |
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383 | target = (intptr_t)target >> 2; |
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384 | |
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385 | if (((Elf_Sword)target > 0x1FFFFFF) || ((Elf_Sword)target < -0x2000000)) { |
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386 | Elf_Word tramp_addr; |
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387 | size_t tramp_size = get_veneer_size(ELF_R_TYPE(rela->r_info)); |
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388 | |
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389 | if (parsing) { |
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390 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
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391 | printf ("rtl: JUMP26/PC26/CALL tramp add\n"); |
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392 | return rtems_rtl_elf_rel_tramp_add; |
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393 | } |
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394 | |
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395 | if (!rtems_rtl_obj_has_tramp_space (obj, tramp_size)) { |
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396 | rtems_rtl_set_error (EINVAL, |
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397 | "%s: CALL/JUMP26: overflow: no tramp memory", |
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398 | sect->name); |
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399 | return rtems_rtl_elf_rel_failure; |
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400 | } |
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401 | |
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402 | tramp_addr = ((Elf_Addr) obj->tramp_brk) | (symvalue & 1); |
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403 | obj->tramp_brk = set_veneer(obj->tramp_brk, symvalue); |
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404 | |
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405 | target = tramp_addr + rela->r_addend - (uintptr_t)where; |
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406 | target = (uintptr_t)target >> 2; |
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407 | } |
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408 | |
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409 | if (checkoverflow(target, 26, raddr, " word", where, off)) { |
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410 | return rtems_rtl_elf_rel_failure; |
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411 | } |
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412 | |
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413 | if (!parsing) { |
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414 | target &= WIDTHMASK(26); |
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415 | *insn = htole32((le32toh(*insn) & ~__BITS(25,0)) | target); |
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416 | } |
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417 | |
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418 | break; |
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419 | |
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420 | case R_AARCH64_PREL32: |
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421 | /* |
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422 | * S + A - P |
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423 | * e.g.) 1: .word <sym>+<addend>-1b |
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424 | */ |
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425 | if (!parsing) { |
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426 | raddr = (Elf_Addr)symvalue + rela->r_addend; |
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427 | target = raddr - (uintptr_t)where; |
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428 | if (checkoverflow(target, 32, raddr, "", where, off)) { |
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429 | return rtems_rtl_elf_rel_failure; |
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430 | } |
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431 | *where32 = target; |
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432 | } |
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433 | break; |
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434 | |
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435 | case R_TYPE(TLSDESC): |
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436 | printf ("rtl: reloc TLSDESC in %s --> %p in %s\n", |
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437 | sect->name, (void *)*where, |
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438 | rtems_rtl_obj_oname (obj)); |
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439 | break; |
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440 | |
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441 | case R_TLS_TYPE(TLS_DTPREL): |
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442 | printf ("rtl: reloc TLS_DTPREL in %s --> %p in %s\n", |
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443 | sect->name, (void *)*where, |
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444 | rtems_rtl_obj_oname (obj)); |
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445 | break; |
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446 | case R_TLS_TYPE(TLS_DTPMOD): |
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447 | printf ("rtl: reloc TLS_DTPMOD in %s --> %p in %s\n", |
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448 | sect->name, (void *)*where, |
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449 | rtems_rtl_obj_oname (obj)); |
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450 | break; |
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451 | |
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452 | case R_TLS_TYPE(TLS_TPREL): |
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453 | printf ("rtl: reloc TLS_TPREL in %s --> %p in %s\n", |
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454 | sect->name, (void *)*where, |
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455 | rtems_rtl_obj_oname (obj)); |
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456 | break; |
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457 | |
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458 | default: |
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459 | printf ("rtl: Unsupported relocation type in %s --> %p in %s\n", |
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460 | sect->name, (void *)where, |
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461 | rtems_rtl_obj_oname (obj)); |
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462 | return rtems_rtl_elf_rel_failure; |
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463 | } |
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464 | |
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465 | return rtems_rtl_elf_rel_no_error; |
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466 | } |
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467 | |
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468 | rtems_rtl_elf_rel_status |
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469 | rtems_rtl_elf_relocate_rela_tramp (rtems_rtl_obj* obj, |
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470 | const Elf_Rela* rela, |
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471 | const rtems_rtl_obj_sect* sect, |
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472 | const char* symname, |
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473 | const Elf_Byte syminfo, |
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474 | const Elf_Word symvalue) |
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475 | { |
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476 | return rtems_rtl_elf_reloc_rela (obj, |
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477 | rela, |
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478 | sect, |
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479 | symname, |
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480 | syminfo, |
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481 | symvalue, |
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482 | true); |
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483 | } |
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484 | |
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485 | rtems_rtl_elf_rel_status |
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486 | rtems_rtl_elf_relocate_rela (rtems_rtl_obj* obj, |
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487 | const Elf_Rela* rela, |
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488 | const rtems_rtl_obj_sect* sect, |
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489 | const char* symname, |
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490 | const Elf_Byte syminfo, |
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491 | const Elf_Word symvalue) |
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492 | { |
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493 | return rtems_rtl_elf_reloc_rela (obj, |
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494 | rela, |
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495 | sect, |
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496 | symname, |
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497 | syminfo, |
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498 | symvalue, |
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499 | false); |
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500 | } |
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501 | |
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502 | rtems_rtl_elf_rel_status |
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503 | rtems_rtl_elf_relocate_rel_tramp (rtems_rtl_obj* obj, |
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504 | const Elf_Rel* rel, |
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505 | const rtems_rtl_obj_sect* sect, |
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506 | const char* symname, |
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507 | const Elf_Byte syminfo, |
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508 | const Elf_Word symvalue) |
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509 | { |
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510 | rtems_rtl_set_error (EINVAL, "rela type record not supported"); |
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511 | return rtems_rtl_elf_rel_failure; |
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512 | } |
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513 | |
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514 | rtems_rtl_elf_rel_status |
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515 | rtems_rtl_elf_relocate_rel (rtems_rtl_obj* obj, |
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516 | const Elf_Rel* rel, |
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517 | const rtems_rtl_obj_sect* sect, |
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518 | const char* symname, |
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519 | const Elf_Byte syminfo, |
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520 | const Elf_Word symvalue) |
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521 | { |
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522 | rtems_rtl_set_error (EINVAL, "rela type record not supported"); |
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523 | return rtems_rtl_elf_rel_failure; |
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524 | } |
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525 | |
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526 | bool |
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527 | rtems_rtl_elf_unwind_parse (const rtems_rtl_obj* obj, |
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528 | const char* name, |
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529 | uint32_t flags) |
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530 | { |
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531 | /* |
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532 | * We location the EH sections in section flags. |
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533 | */ |
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534 | return false; |
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535 | } |
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536 | |
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537 | bool |
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538 | rtems_rtl_elf_unwind_register (rtems_rtl_obj* obj) |
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539 | { |
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540 | return true; |
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541 | } |
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542 | |
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543 | bool |
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544 | rtems_rtl_elf_unwind_deregister (rtems_rtl_obj* obj) |
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545 | { |
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546 | obj->loader = NULL; |
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547 | return true; |
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548 | } |
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549 | |
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550 | /* An exception index table entry. */ |
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551 | typedef struct __EIT_entry |
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552 | { |
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553 | _uw fnoffset; |
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554 | _uw content; |
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555 | } __EIT_entry; |
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556 | |
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557 | /* The exception index table location in the base module */ |
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558 | extern __EIT_entry __exidx_start; |
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559 | extern __EIT_entry __exidx_end; |
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560 | |
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561 | /* |
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562 | * A weak reference is in libgcc, provide a real version and provide a way to |
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563 | * manage loaded modules. |
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564 | * |
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565 | * Passed in the return address and a reference to the number of records |
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566 | * found. We set the start of the exidx data and the number of records. |
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567 | */ |
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568 | _Unwind_Ptr __gnu_Unwind_Find_exidx (_Unwind_Ptr return_address, |
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569 | int* nrec) __attribute__ ((__noinline__, |
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570 | __used__, |
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571 | __noclone__)); |
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572 | |
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573 | _Unwind_Ptr __gnu_Unwind_Find_exidx (_Unwind_Ptr return_address, |
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574 | int* nrec) |
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575 | { |
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576 | rtems_rtl_data* rtl; |
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577 | rtems_chain_node* node; |
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578 | __EIT_entry* exidx_start = &__exidx_start; |
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579 | __EIT_entry* exidx_end = &__exidx_end; |
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580 | |
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581 | rtl = rtems_rtl_lock (); |
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582 | |
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583 | node = rtems_chain_first (&rtl->objects); |
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584 | while (!rtems_chain_is_tail (&rtl->objects, node)) { |
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585 | rtems_rtl_obj* obj = (rtems_rtl_obj*) node; |
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586 | if (rtems_rtl_obj_text_inside (obj, (void*) return_address)) { |
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587 | exidx_start = (__EIT_entry*) obj->eh_base; |
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588 | exidx_end = (__EIT_entry*) (obj->eh_base + obj->eh_size); |
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589 | break; |
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590 | } |
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591 | node = rtems_chain_next (node); |
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592 | } |
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593 | |
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594 | rtems_rtl_unlock (); |
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595 | |
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596 | *nrec = exidx_end - exidx_start; |
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597 | |
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598 | return (_Unwind_Ptr) exidx_start; |
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599 | } |
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