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| 2 | |
| 3 | * sortextable.h
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| 4 | *
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| 5 | * Copyright 2011 - 2012 Cavium, Inc.
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| 6 | *
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| 7 | * Some of this code was taken out of recordmcount.h written by:
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| 8 | *
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| 9 | * Copyright 2009 John F. Reiser <[email protected]>. All rights reserved.
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| 10 | * Copyright 2010 Steven Rostedt <[email protected]>, Red Hat Inc.
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| 11 |
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| 12 |
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| 13 | #undef extable_ent_size
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| 14 | #undef compare_extable
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| 15 | #undef do_func
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| 16 | #undef Elf_Addr
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| 17 | #undef Elf_Ehdr
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| 18 | #undef Elf_Shdr
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| 19 | #undef Elf_Rel
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| 20 | #undef Elf_Rela
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| 21 | #undef Elf_Sym
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| 22 | #undef ELF_R_SYM
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| 23 | #undef Elf_r_sym
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| 24 | #undef ELF_R_INFO
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| 25 | #undef Elf_r_info
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| 26 | #undef ELF_ST_BIND
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| 27 | #undef ELF_ST_TYPE
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| 28 | #undef fn_ELF_R_SYM
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| 29 | #undef fn_ELF_R_INFO
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| 30 | #undef uint_t
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| 31 | #undef _r
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| 32 | #undef _w
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| 33 |
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| 34 | #ifdef SORTEXTABLE_64
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| 35 | # define extable_ent_size 16
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| 36 | # define compare_extable compare_extable_64
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| 37 | # define do_func do64
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| 38 | # define Elf_Addr Elf64_Addr
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| 39 | # define Elf_Ehdr Elf64_Ehdr
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| 40 | # define Elf_Shdr Elf64_Shdr
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| 41 | # define Elf_Rel Elf64_Rel
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| 42 | # define Elf_Rela Elf64_Rela
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| 43 | # define Elf_Sym Elf64_Sym
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| 44 | # define ELF_R_SYM ELF64_R_SYM
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| 45 | # define Elf_r_sym Elf64_r_sym
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| 46 | # define ELF_R_INFO ELF64_R_INFO
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| 47 | # define Elf_r_info Elf64_r_info
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| 48 | # define ELF_ST_BIND ELF64_ST_BIND
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| 49 | # define ELF_ST_TYPE ELF64_ST_TYPE
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| 50 | # define fn_ELF_R_SYM fn_ELF64_R_SYM
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| 51 | # define fn_ELF_R_INFO fn_ELF64_R_INFO
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| 52 | # define uint_t uint64_t
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| 53 | # define _r r8
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| 54 | # define _w w8
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| 55 | #else
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| 56 | # define extable_ent_size 8
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| 57 | # define compare_extable compare_extable_32
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| 58 | # define do_func do32
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| 59 | # define Elf_Addr Elf32_Addr
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| 60 | # define Elf_Ehdr Elf32_Ehdr
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| 61 | # define Elf_Shdr Elf32_Shdr
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| 62 | # define Elf_Rel Elf32_Rel
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| 63 | # define Elf_Rela Elf32_Rela
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| 64 | # define Elf_Sym Elf32_Sym
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| 65 | # define ELF_R_SYM ELF32_R_SYM
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| 66 | # define Elf_r_sym Elf32_r_sym
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| 67 | # define ELF_R_INFO ELF32_R_INFO
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| 68 | # define Elf_r_info Elf32_r_info
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| 69 | # define ELF_ST_BIND ELF32_ST_BIND
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| 70 | # define ELF_ST_TYPE ELF32_ST_TYPE
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| 71 | # define fn_ELF_R_SYM fn_ELF32_R_SYM
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| 72 | # define fn_ELF_R_INFO fn_ELF32_R_INFO
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| 73 | # define uint_t uint32_t
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| 74 | # define _r r
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| 75 | # define _w w
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| 76 | #endif
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| 77 |
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| 78 | static int compare_extable(const void *a, const void *b)
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| 79 | {
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| 80 | Elf_Addr av = _r(a);
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| 81 | Elf_Addr bv = _r(b);
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| 82 |
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| 83 | if (av < bv)
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| 84 | return -1;
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| 85 | if (av > bv)
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| 86 | return 1;
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| 87 | return 0;
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| 88 | }
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| 89 |
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| 90 | static void
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| 91 | do_func(Elf_Ehdr *ehdr, char const *const fname, table_sort_t custom_sort)
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| 92 | {
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| 93 | Elf_Shdr *shdr;
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| 94 | Elf_Shdr *shstrtab_sec;
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| 95 | Elf_Shdr *strtab_sec = NULL;
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| 96 | Elf_Shdr *symtab_sec = NULL;
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| 97 | Elf_Shdr *extab_sec = NULL;
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| 98 | Elf_Sym *sym;
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| 99 | const Elf_Sym *symtab;
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| 100 | Elf32_Word *symtab_shndx_start = NULL;
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| 101 | Elf_Sym *sort_needed_sym;
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| 102 | Elf_Shdr *sort_needed_sec;
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| 103 | Elf_Rel *relocs = NULL;
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| 104 | int relocs_size = 0;
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| 105 | uint32_t *sort_done_location;
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| 106 | const char *secstrtab;
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| 107 | const char *strtab;
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| 108 | char *extab_image;
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| 109 | int extab_index = 0;
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| 110 | int i;
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| 111 | int idx;
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| 112 | unsigned int num_sections;
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| 113 | unsigned int secindex_strings;
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| 114 |
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| 115 | shdr = (Elf_Shdr *)((char *)ehdr + _r(&ehdr->e_shoff));
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| 116 |
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| 117 | num_sections = r2(&ehdr->e_shnum);
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| 118 | if (num_sections == SHN_UNDEF)
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| 119 | num_sections = _r(&shdr[0].sh_size);
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| 120 |
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| 121 | secindex_strings = r2(&ehdr->e_shstrndx);
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| 122 | if (secindex_strings == SHN_XINDEX)
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| 123 | secindex_strings = r(&shdr[0].sh_link);
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| 124 |
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| 125 | shstrtab_sec = shdr + secindex_strings;
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| 126 | secstrtab = (const char *)ehdr + _r(&shstrtab_sec->sh_offset);
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| 127 | for (i = 0; i < num_sections; i++) {
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| 128 | idx = r(&shdr[i].sh_name);
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| 129 | if (strcmp(secstrtab + idx, "__ex_table") == 0) {
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| 130 | extab_sec = shdr + i;
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| 131 | extab_index = i;
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| 132 | }
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| 133 | if ((r(&shdr[i].sh_type) == SHT_REL ||
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| 134 | r(&shdr[i].sh_type) == SHT_RELA) &&
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| 135 | r(&shdr[i].sh_info) == extab_index) {
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| 136 | relocs = (void *)ehdr + _r(&shdr[i].sh_offset);
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| 137 | relocs_size = _r(&shdr[i].sh_size);
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| 138 | }
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| 139 | if (strcmp(secstrtab + idx, ".symtab") == 0)
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| 140 | symtab_sec = shdr + i;
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| 141 | if (strcmp(secstrtab + idx, ".strtab") == 0)
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| 142 | strtab_sec = shdr + i;
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| 143 | if (r(&shdr[i].sh_type) == SHT_SYMTAB_SHNDX)
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| 144 | symtab_shndx_start = (Elf32_Word *)(
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| 145 | (const char *)ehdr + _r(&shdr[i].sh_offset));
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| 146 | }
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| 147 | if (strtab_sec == NULL) {
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| 148 | fprintf(stderr, "no .strtab in file: %s\n", fname);
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| 149 | fail_file();
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| 150 | }
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| 151 | if (symtab_sec == NULL) {
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| 152 | fprintf(stderr, "no .symtab in file: %s\n", fname);
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| 153 | fail_file();
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| 154 | }
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| 155 | symtab = (const Elf_Sym *)((const char *)ehdr +
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| 156 | _r(&symtab_sec->sh_offset));
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| 157 | if (extab_sec == NULL) {
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| 158 | fprintf(stderr, "no __ex_table in file: %s\n", fname);
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| 159 | fail_file();
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| 160 | }
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| 161 | strtab = (const char *)ehdr + _r(&strtab_sec->sh_offset);
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| 162 |
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| 163 | extab_image = (void *)ehdr + _r(&extab_sec->sh_offset);
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| 164 |
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| 165 | if (custom_sort) {
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| 166 | custom_sort(extab_image, _r(&extab_sec->sh_size));
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| 167 | } else {
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| 168 | int num_entries = _r(&extab_sec->sh_size) / extable_ent_size;
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| 169 | qsort(extab_image, num_entries,
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| 170 | extable_ent_size, compare_extable);
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| 171 | }
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| 172 |
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| 173 | if (relocs)
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| 174 | memset(relocs, 0, relocs_size);
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| 175 |
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| 176 |
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| 177 | sort_needed_sym = NULL;
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| 178 | for (i = 0; i < _r(&symtab_sec->sh_size) / sizeof(Elf_Sym); i++) {
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| 179 | sym = (void *)ehdr + _r(&symtab_sec->sh_offset);
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| 180 | sym += i;
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| 181 | if (ELF_ST_TYPE(sym->st_info) != STT_OBJECT)
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| 182 | continue;
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| 183 | idx = r(&sym->st_name);
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| 184 | if (strcmp(strtab + idx, "main_extable_sort_needed") == 0) {
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| 185 | sort_needed_sym = sym;
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| 186 | break;
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| 187 | }
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| 188 | }
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| 189 | if (sort_needed_sym == NULL) {
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| 190 | fprintf(stderr,
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| 191 | "no main_extable_sort_needed symbol in file: %s\n",
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| 192 | fname);
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| 193 | fail_file();
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| 194 | }
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| 195 | sort_needed_sec = &shdr[get_secindex(r2(&sym->st_shndx),
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| 196 | sort_needed_sym - symtab,
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| 197 | symtab_shndx_start)];
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| 198 | sort_done_location = (void *)ehdr +
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| 199 | _r(&sort_needed_sec->sh_offset) +
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| 200 | _r(&sort_needed_sym->st_value) -
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| 201 | _r(&sort_needed_sec->sh_addr);
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| 202 |
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| 203 | #if 0 |
| 204 | printf("sort done marker at %lx\n",
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| 205 | (unsigned long)((char *)sort_done_location - (char *)ehdr));
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| 206 | #endif
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| 207 |
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| 208 | w(0, sort_done_location);
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| 209 | }
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