1 | /* |
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2 | * QEMU Executable loader |
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3 | * |
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4 | * Copyright (c) 2006 Fabrice Bellard |
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5 | * |
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6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
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7 | * of this software and associated documentation files (the "Software"), to deal |
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8 | * in the Software without restriction, including without limitation the rights |
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9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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10 | * copies of the Software, and to permit persons to whom the Software is |
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11 | * furnished to do so, subject to the following conditions: |
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12 | * |
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13 | * The above copyright notice and this permission notice shall be included in |
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14 | * all copies or substantial portions of the Software. |
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15 | * |
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16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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22 | * THE SOFTWARE. |
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23 | */ |
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24 | #include "vl.h" |
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25 | #include "disas.h" |
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26 | |
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27 | /* return the size or -1 if error */ |
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28 | int get_image_size(const char *filename) |
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29 | { |
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30 | int fd, size; |
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31 | fd = open(filename, O_RDONLY | O_BINARY); |
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32 | if (fd < 0) |
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33 | return -1; |
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34 | size = lseek(fd, 0, SEEK_END); |
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35 | close(fd); |
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36 | return size; |
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37 | } |
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38 | |
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39 | /* return the size or -1 if error */ |
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40 | int load_image(const char *filename, uint8_t *addr) |
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41 | { |
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42 | int fd, size; |
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43 | fd = open(filename, O_RDONLY | O_BINARY); |
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44 | if (fd < 0) |
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45 | return -1; |
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46 | size = lseek(fd, 0, SEEK_END); |
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47 | lseek(fd, 0, SEEK_SET); |
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48 | if (read(fd, addr, size) != size) { |
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49 | close(fd); |
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50 | return -1; |
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51 | } |
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52 | close(fd); |
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53 | return size; |
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54 | } |
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55 | |
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56 | /* A.OUT loader */ |
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57 | |
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58 | struct exec |
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59 | { |
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60 | uint32_t a_info; /* Use macros N_MAGIC, etc for access */ |
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61 | uint32_t a_text; /* length of text, in bytes */ |
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62 | uint32_t a_data; /* length of data, in bytes */ |
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63 | uint32_t a_bss; /* length of uninitialized data area, in bytes */ |
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64 | uint32_t a_syms; /* length of symbol table data in file, in bytes */ |
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65 | uint32_t a_entry; /* start address */ |
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66 | uint32_t a_trsize; /* length of relocation info for text, in bytes */ |
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67 | uint32_t a_drsize; /* length of relocation info for data, in bytes */ |
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68 | }; |
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69 | |
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70 | #ifdef BSWAP_NEEDED |
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71 | static void bswap_ahdr(struct exec *e) |
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72 | { |
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73 | bswap32s(&e->a_info); |
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74 | bswap32s(&e->a_text); |
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75 | bswap32s(&e->a_data); |
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76 | bswap32s(&e->a_bss); |
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77 | bswap32s(&e->a_syms); |
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78 | bswap32s(&e->a_entry); |
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79 | bswap32s(&e->a_trsize); |
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80 | bswap32s(&e->a_drsize); |
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81 | } |
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82 | #else |
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83 | #define bswap_ahdr(x) do { } while (0) |
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84 | #endif |
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85 | |
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86 | #define N_MAGIC(exec) ((exec).a_info & 0xffff) |
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87 | #define OMAGIC 0407 |
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88 | #define NMAGIC 0410 |
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89 | #define ZMAGIC 0413 |
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90 | #define QMAGIC 0314 |
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91 | #define _N_HDROFF(x) (1024 - sizeof (struct exec)) |
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92 | #define N_TXTOFF(x) \ |
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93 | (N_MAGIC(x) == ZMAGIC ? _N_HDROFF((x)) + sizeof (struct exec) : \ |
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94 | (N_MAGIC(x) == QMAGIC ? 0 : sizeof (struct exec))) |
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95 | #define N_TXTADDR(x) (N_MAGIC(x) == QMAGIC ? TARGET_PAGE_SIZE : 0) |
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96 | #define N_DATOFF(x) (N_TXTOFF(x) + (x).a_text) |
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97 | #define _N_SEGMENT_ROUND(x) (((x) + TARGET_PAGE_SIZE - 1) & ~(TARGET_PAGE_SIZE - 1)) |
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98 | |
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99 | #define _N_TXTENDADDR(x) (N_TXTADDR(x)+(x).a_text) |
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100 | |
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101 | #define N_DATADDR(x) \ |
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102 | (N_MAGIC(x)==OMAGIC? (_N_TXTENDADDR(x)) \ |
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103 | : (_N_SEGMENT_ROUND (_N_TXTENDADDR(x)))) |
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104 | |
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105 | |
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106 | int load_aout(const char *filename, uint8_t *addr) |
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107 | { |
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108 | int fd, size, ret; |
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109 | struct exec e; |
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110 | uint32_t magic; |
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111 | |
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112 | fd = open(filename, O_RDONLY | O_BINARY); |
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113 | if (fd < 0) |
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114 | return -1; |
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115 | |
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116 | size = read(fd, &e, sizeof(e)); |
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117 | if (size < 0) |
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118 | goto fail; |
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119 | |
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120 | bswap_ahdr(&e); |
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121 | |
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122 | magic = N_MAGIC(e); |
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123 | switch (magic) { |
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124 | case ZMAGIC: |
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125 | case QMAGIC: |
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126 | case OMAGIC: |
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127 | lseek(fd, N_TXTOFF(e), SEEK_SET); |
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128 | size = read(fd, addr, e.a_text + e.a_data); |
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129 | if (size < 0) |
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130 | goto fail; |
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131 | break; |
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132 | case NMAGIC: |
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133 | lseek(fd, N_TXTOFF(e), SEEK_SET); |
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134 | size = read(fd, addr, e.a_text); |
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135 | if (size < 0) |
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136 | goto fail; |
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137 | ret = read(fd, addr + N_DATADDR(e), e.a_data); |
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138 | if (ret < 0) |
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139 | goto fail; |
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140 | size += ret; |
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141 | break; |
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142 | default: |
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143 | goto fail; |
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144 | } |
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145 | close(fd); |
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146 | return size; |
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147 | fail: |
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148 | close(fd); |
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149 | return -1; |
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150 | } |
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151 | |
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152 | /* ELF loader */ |
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153 | |
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154 | static void *load_at(int fd, int offset, int size) |
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155 | { |
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156 | void *ptr; |
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157 | if (lseek(fd, offset, SEEK_SET) < 0) |
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158 | return NULL; |
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159 | ptr = qemu_malloc(size); |
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160 | if (!ptr) |
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161 | return NULL; |
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162 | if (read(fd, ptr, size) != size) { |
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163 | qemu_free(ptr); |
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164 | return NULL; |
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165 | } |
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166 | return ptr; |
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167 | } |
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168 | |
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169 | |
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170 | #define ELF_CLASS ELFCLASS32 |
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171 | #include "elf.h" |
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172 | |
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173 | #define SZ 32 |
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174 | #define elf_word uint32_t |
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175 | #define bswapSZs bswap32s |
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176 | #include "elf_ops.h" |
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177 | |
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178 | #undef elfhdr |
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179 | #undef elf_phdr |
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180 | #undef elf_shdr |
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181 | #undef elf_sym |
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182 | #undef elf_note |
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183 | #undef elf_word |
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184 | #undef bswapSZs |
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185 | #undef SZ |
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186 | #define elfhdr elf64_hdr |
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187 | #define elf_phdr elf64_phdr |
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188 | #define elf_note elf64_note |
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189 | #define elf_shdr elf64_shdr |
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190 | #define elf_sym elf64_sym |
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191 | #define elf_word uint64_t |
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192 | #define bswapSZs bswap64s |
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193 | #define SZ 64 |
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194 | #include "elf_ops.h" |
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195 | |
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196 | /* return < 0 if error, otherwise the number of bytes loaded in memory */ |
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197 | int load_elf(const char *filename, int64_t virt_to_phys_addend, |
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198 | uint64_t *pentry) |
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199 | { |
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200 | int fd, data_order, must_swab, ret; |
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201 | uint8_t e_ident[EI_NIDENT]; |
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202 | |
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203 | fd = open(filename, O_RDONLY | O_BINARY); |
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204 | if (fd < 0) { |
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205 | perror(filename); |
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206 | return -1; |
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207 | } |
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208 | if (read(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident)) |
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209 | goto fail; |
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210 | if (e_ident[0] != ELFMAG0 || |
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211 | e_ident[1] != ELFMAG1 || |
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212 | e_ident[2] != ELFMAG2 || |
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213 | e_ident[3] != ELFMAG3) |
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214 | goto fail; |
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215 | #ifdef WORDS_BIGENDIAN |
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216 | data_order = ELFDATA2MSB; |
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217 | #else |
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218 | data_order = ELFDATA2LSB; |
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219 | #endif |
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220 | must_swab = data_order != e_ident[EI_DATA]; |
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221 | |
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222 | lseek(fd, 0, SEEK_SET); |
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223 | if (e_ident[EI_CLASS] == ELFCLASS64) { |
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224 | ret = load_elf64(fd, virt_to_phys_addend, must_swab, pentry); |
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225 | } else { |
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226 | ret = load_elf32(fd, virt_to_phys_addend, must_swab, pentry); |
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227 | } |
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228 | |
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229 | close(fd); |
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230 | return ret; |
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231 | |
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232 | fail: |
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233 | close(fd); |
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234 | return -1; |
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235 | } |
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