[ae5fe7e6] | 1 | /* |
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[b36c5209] | 2 | * COPYRIGHT (c) 2012-2019 Chris Johns <chrisj@rtems.org> |
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[ae5fe7e6] | 3 | * |
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| 4 | * The license and distribution terms for this file may be |
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| 5 | * found in the file LICENSE in this distribution or at |
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[d4edbdbc] | 6 | * http://www.rtems.org/license/LICENSE. |
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[ae5fe7e6] | 7 | */ |
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| 8 | /** |
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| 9 | * @file |
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| 10 | * |
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| 11 | * @ingroup rtems_rtld |
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| 12 | * |
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| 13 | * @brief RTEMS Run-Time Link Editor |
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| 14 | * |
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| 15 | * This is the RTL implementation. |
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| 16 | */ |
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| 17 | |
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| 18 | #if HAVE_CONFIG_H |
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| 19 | #include "config.h" |
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| 20 | #endif |
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| 21 | |
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| 22 | #include <errno.h> |
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| 23 | #include <fcntl.h> |
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[194eb403] | 24 | #include <inttypes.h> |
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[ae5fe7e6] | 25 | #include <stdlib.h> |
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| 26 | #include <string.h> |
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| 27 | #include <stdio.h> |
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| 28 | #include <unistd.h> |
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| 29 | |
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| 30 | #include <rtems/rtl/rtl.h> |
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| 31 | #include "rtl-elf.h" |
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| 32 | #include "rtl-error.h" |
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[990adc5] | 33 | #include <rtems/rtl/rtl-trace.h> |
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[b36c5209] | 34 | #include "rtl-trampoline.h" |
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[c6eead1] | 35 | #include "rtl-unwind.h" |
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[990adc5] | 36 | #include <rtems/rtl/rtl-unresolved.h> |
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[ae5fe7e6] | 37 | |
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| 38 | /** |
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[b36c5209] | 39 | * The offsets in the reloc words. |
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[ae5fe7e6] | 40 | */ |
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| 41 | #define REL_R_OFFSET (0) |
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| 42 | #define REL_R_INFO (1) |
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| 43 | #define REL_R_ADDEND (2) |
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| 44 | |
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| 45 | /** |
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| 46 | * The ELF format signature. |
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| 47 | */ |
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[f59d435d] | 48 | static rtems_rtl_loader_format elf_sig = |
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[ae5fe7e6] | 49 | { |
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| 50 | .label = "ELF", |
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| 51 | .flags = RTEMS_RTL_FMT_ELF |
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| 52 | }; |
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| 53 | |
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| 54 | static bool |
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| 55 | rtems_rtl_elf_machine_check (Elf_Ehdr* ehdr) |
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| 56 | { |
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| 57 | /* |
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| 58 | * This code is determined by the NetBSD machine headers. |
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| 59 | */ |
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| 60 | switch (ehdr->e_machine) |
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| 61 | { |
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| 62 | ELFDEFNNAME (MACHDEP_ID_CASES) |
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| 63 | default: |
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| 64 | return false; |
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| 65 | } |
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| 66 | return true; |
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| 67 | } |
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| 68 | |
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[194eb403] | 69 | static const char* |
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| 70 | rtems_rtl_elf_separated_section (const char* name) |
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| 71 | { |
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| 72 | struct { |
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| 73 | const char* label; |
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| 74 | size_t len; |
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| 75 | } prefix[] = { |
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| 76 | #define SEPARATED_PREFIX(_p) { _p, sizeof (_p) - 1 } |
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| 77 | SEPARATED_PREFIX (".text."), |
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| 78 | SEPARATED_PREFIX (".rel.text."), |
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| 79 | SEPARATED_PREFIX (".data."), |
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| 80 | SEPARATED_PREFIX (".rel.data."), |
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| 81 | SEPARATED_PREFIX (".rodata."), |
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| 82 | SEPARATED_PREFIX (".rel.rodata.") |
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| 83 | }; |
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| 84 | const size_t prefixes = sizeof (prefix) / sizeof (prefix[0]); |
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| 85 | size_t p; |
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| 86 | for (p = 0; p < prefixes; ++p) |
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| 87 | { |
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| 88 | if (strncmp (name, prefix[p].label, prefix[p].len) == 0) |
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| 89 | return name + prefix[p].len; |
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| 90 | } |
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| 91 | return NULL; |
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| 92 | } |
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| 93 | |
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[03139d5b] | 94 | static bool |
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| 95 | rtems_rtl_elf_find_symbol (rtems_rtl_obj* obj, |
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| 96 | const Elf_Sym* sym, |
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| 97 | const char* symname, |
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| 98 | rtems_rtl_obj_sym** symbol, |
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| 99 | Elf_Word* value) |
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[ae5fe7e6] | 100 | { |
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[f59d435d] | 101 | rtems_rtl_obj_sect* sect; |
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[ae5fe7e6] | 102 | |
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[03139d5b] | 103 | /* |
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| 104 | * If the symbol type is STT_NOTYPE the symbol references a global |
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| 105 | * symbol. The gobal symbol table is searched to find it and that value |
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| 106 | * returned. If the symbol is local to the object module the section for the |
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| 107 | * symbol is located and it's base added to the symbol's value giving an |
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| 108 | * absolute location. |
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| 109 | */ |
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| 110 | if (ELF_ST_TYPE(sym->st_info) == STT_NOTYPE || sym->st_shndx == SHN_COMMON) |
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[ae5fe7e6] | 111 | { |
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[a2e1e30d] | 112 | /* |
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| 113 | * Search the object file then the global table for the symbol. |
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| 114 | */ |
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[03139d5b] | 115 | *symbol = rtems_rtl_symbol_obj_find (obj, symname); |
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| 116 | if (!*symbol) |
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[ae5fe7e6] | 117 | return false; |
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| 118 | |
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[03139d5b] | 119 | *value = (Elf_Addr) (*symbol)->value; |
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[ae5fe7e6] | 120 | return true; |
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| 121 | } |
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| 122 | |
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[03139d5b] | 123 | *symbol = NULL; |
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| 124 | |
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[ae5fe7e6] | 125 | sect = rtems_rtl_obj_find_section_by_index (obj, sym->st_shndx); |
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| 126 | if (!sect) |
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| 127 | return false; |
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| 128 | |
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[8bdbefe] | 129 | *value = sym->st_value + (Elf_Addr) sect->base; |
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[194eb403] | 130 | |
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[ae5fe7e6] | 131 | return true; |
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| 132 | } |
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| 133 | |
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[03139d5b] | 134 | /** |
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| 135 | * Relocation worker routine. |
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| 136 | */ |
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| 137 | typedef bool (*rtems_rtl_elf_reloc_handler)(rtems_rtl_obj* obj, |
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| 138 | bool is_rela, |
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| 139 | void* relbuf, |
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| 140 | rtems_rtl_obj_sect* targetsect, |
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| 141 | rtems_rtl_obj_sym* symbol, |
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| 142 | Elf_Sym* sym, |
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| 143 | const char* symname, |
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| 144 | Elf_Word symvalue, |
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| 145 | bool resolved, |
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| 146 | void* data); |
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| 147 | |
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| 148 | /** |
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| 149 | * Relocation parser data. |
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| 150 | */ |
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| 151 | typedef struct |
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| 152 | { |
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| 153 | size_t dependents; /**< The number of dependent object files. */ |
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| 154 | size_t unresolved; /**< The number of unresolved symbols. */ |
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| 155 | } rtems_rtl_elf_reloc_data; |
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| 156 | |
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| 157 | static bool |
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| 158 | rtems_rtl_elf_reloc_parser (rtems_rtl_obj* obj, |
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| 159 | bool is_rela, |
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| 160 | void* relbuf, |
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| 161 | rtems_rtl_obj_sect* targetsect, |
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| 162 | rtems_rtl_obj_sym* symbol, |
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| 163 | Elf_Sym* sym, |
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| 164 | const char* symname, |
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| 165 | Elf_Word symvalue, |
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| 166 | bool resolved, |
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| 167 | void* data) |
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| 168 | { |
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| 169 | rtems_rtl_elf_reloc_data* rd = (rtems_rtl_elf_reloc_data*) data; |
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[b36c5209] | 170 | rtems_rtl_word rel_words[3]; |
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| 171 | rtems_rtl_elf_rel_status rs; |
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[d8c70ba6] | 172 | |
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| 173 | /* |
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[b36c5209] | 174 | * Check the reloc record to see if a trampoline is needed. |
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[03139d5b] | 175 | */ |
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[b36c5209] | 176 | if (is_rela) |
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[03139d5b] | 177 | { |
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[b36c5209] | 178 | const Elf_Rela* rela = (const Elf_Rela*) relbuf; |
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| 179 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
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| 180 | printf ("rtl: rela tramp: sym: %c:%s(%d)=%08jx type:%d off:%08jx addend:%d\n", |
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| 181 | ELF_ST_BIND (sym->st_info) == STB_GLOBAL || |
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| 182 | ELF_ST_BIND (sym->st_info) == STB_WEAK ? 'G' : 'L', |
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| 183 | symname, (int) ELF_R_SYM (rela->r_info), |
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| 184 | (uintmax_t) symvalue, (int) ELF_R_TYPE (rela->r_info), |
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| 185 | (uintmax_t) rela->r_offset, (int) rela->r_addend); |
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| 186 | rs = rtems_rtl_elf_relocate_rela_tramp (obj, rela, targetsect, |
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| 187 | symname, sym->st_info, symvalue); |
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| 188 | rel_words[REL_R_OFFSET] = rela->r_offset; |
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| 189 | rel_words[REL_R_INFO] = rela->r_info; |
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| 190 | rel_words[REL_R_ADDEND] = rela->r_addend; |
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[03139d5b] | 191 | } |
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[194eb403] | 192 | else |
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[b36c5209] | 193 | { |
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| 194 | const Elf_Rel* rel = (const Elf_Rel*) relbuf; |
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| 195 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
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| 196 | printf ("rtl: rel tramp: sym: %c:%s(%d)=%08jx type:%d off:%08jx\n", |
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| 197 | ELF_ST_BIND (sym->st_info) == STB_GLOBAL || |
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| 198 | ELF_ST_BIND (sym->st_info) == STB_WEAK ? 'G' : 'L', |
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| 199 | symname, (int) ELF_R_SYM (rel->r_info), |
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| 200 | (uintmax_t) symvalue, (int) ELF_R_TYPE (rel->r_info), |
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| 201 | (uintmax_t) rel->r_offset); |
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| 202 | rs = rtems_rtl_elf_relocate_rel_tramp (obj, rel, targetsect, |
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| 203 | symname, sym->st_info, symvalue); |
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| 204 | rel_words[REL_R_OFFSET] = rel->r_offset; |
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| 205 | rel_words[REL_R_INFO] = rel->r_info; |
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| 206 | rel_words[REL_R_ADDEND] = 0; |
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| 207 | } |
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| 208 | |
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| 209 | if (rs == rtems_rtl_elf_rel_failure) |
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| 210 | return false; |
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| 211 | |
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| 212 | if (rs == rtems_rtl_elf_rel_tramp_cache || rs == rtems_rtl_elf_rel_tramp_add) |
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| 213 | { |
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| 214 | uint32_t flags = (is_rela ? 1 : 0) | (resolved ? 0 : 1 << 1) | (sym->st_info << 8); |
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| 215 | if (!rtems_rtl_trampoline_add (obj, flags, |
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| 216 | targetsect->section, symvalue, rel_words)) |
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| 217 | return false; |
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| 218 | } |
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| 219 | |
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| 220 | /* |
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| 221 | * Handle any dependencies if there is a valid symbol. |
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| 222 | */ |
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| 223 | if (symname != NULL) |
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[03139d5b] | 224 | { |
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| 225 | /* |
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[b36c5209] | 226 | * Find the symbol's object file. It cannot be NULL so ignore that result |
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| 227 | * if returned, it means something is corrupted. We are in an iterator. |
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[03139d5b] | 228 | */ |
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[b36c5209] | 229 | rtems_rtl_obj* sobj = rtems_rtl_find_obj_with_symbol (symbol); |
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| 230 | if (sobj != NULL) |
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[03139d5b] | 231 | { |
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| 232 | /* |
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[b36c5209] | 233 | * A dependency is not the base kernel image or itself. Tag the object as |
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| 234 | * having been visited so we count it only once. |
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[03139d5b] | 235 | */ |
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[b36c5209] | 236 | if (sobj != rtems_rtl_baseimage () && obj != sobj && |
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| 237 | (sobj->flags & RTEMS_RTL_OBJ_RELOC_TAG) == 0) |
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[03139d5b] | 238 | { |
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[b36c5209] | 239 | sobj->flags |= RTEMS_RTL_OBJ_RELOC_TAG; |
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| 240 | ++rd->dependents; |
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[03139d5b] | 241 | } |
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| 242 | } |
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| 243 | } |
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[194eb403] | 244 | |
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[03139d5b] | 245 | return true; |
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| 246 | } |
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| 247 | |
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| 248 | static bool |
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| 249 | rtems_rtl_elf_reloc_relocator (rtems_rtl_obj* obj, |
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| 250 | bool is_rela, |
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| 251 | void* relbuf, |
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| 252 | rtems_rtl_obj_sect* targetsect, |
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| 253 | rtems_rtl_obj_sym* symbol, |
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| 254 | Elf_Sym* sym, |
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| 255 | const char* symname, |
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| 256 | Elf_Word symvalue, |
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| 257 | bool resolved, |
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| 258 | void* data) |
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| 259 | { |
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| 260 | const Elf_Rela* rela = (const Elf_Rela*) relbuf; |
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| 261 | const Elf_Rel* rel = (const Elf_Rel*) relbuf; |
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| 262 | |
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| 263 | if (!resolved) |
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| 264 | { |
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| 265 | uint16_t flags = 0; |
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| 266 | rtems_rtl_word rel_words[3]; |
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| 267 | |
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| 268 | if (is_rela) |
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| 269 | { |
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| 270 | flags = 1; |
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| 271 | rel_words[REL_R_OFFSET] = rela->r_offset; |
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| 272 | rel_words[REL_R_INFO] = rela->r_info; |
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| 273 | rel_words[REL_R_ADDEND] = rela->r_addend; |
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| 274 | } |
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| 275 | else |
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| 276 | { |
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| 277 | rel_words[REL_R_OFFSET] = rel->r_offset; |
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| 278 | rel_words[REL_R_INFO] = rel->r_info; |
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| 279 | rel_words[REL_R_ADDEND] = 0; |
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| 280 | } |
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| 281 | |
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| 282 | if (!rtems_rtl_unresolved_add (obj, |
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| 283 | flags, |
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| 284 | symname, |
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| 285 | targetsect->section, |
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| 286 | rel_words)) |
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| 287 | return false; |
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| 288 | |
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| 289 | ++obj->unresolved; |
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| 290 | } |
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| 291 | else |
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| 292 | { |
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[b36c5209] | 293 | rtems_rtl_obj* sobj; |
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| 294 | rtems_rtl_elf_rel_status rs; |
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[03139d5b] | 295 | |
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| 296 | if (is_rela) |
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| 297 | { |
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| 298 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
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| 299 | printf ("rtl: rela: sym:%s(%d)=%08jx type:%d off:%08jx addend:%d\n", |
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| 300 | symname, (int) ELF_R_SYM (rela->r_info), |
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| 301 | (uintmax_t) symvalue, (int) ELF_R_TYPE (rela->r_info), |
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| 302 | (uintmax_t) rela->r_offset, (int) rela->r_addend); |
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[b36c5209] | 303 | rs = rtems_rtl_elf_relocate_rela (obj, rela, targetsect, |
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| 304 | symname, sym->st_info, symvalue); |
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| 305 | if (rs != rtems_rtl_elf_rel_no_error) |
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[03139d5b] | 306 | return false; |
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| 307 | } |
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| 308 | else |
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| 309 | { |
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| 310 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
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| 311 | printf ("rtl: rel: sym:%s(%d)=%08jx type:%d off:%08jx\n", |
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| 312 | symname, (int) ELF_R_SYM (rel->r_info), |
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| 313 | (uintmax_t) symvalue, (int) ELF_R_TYPE (rel->r_info), |
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| 314 | (uintmax_t) rel->r_offset); |
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[b36c5209] | 315 | rs = rtems_rtl_elf_relocate_rel (obj, rel, targetsect, |
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| 316 | symname, sym->st_info, symvalue); |
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| 317 | if (rs != rtems_rtl_elf_rel_no_error) |
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[03139d5b] | 318 | return false; |
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| 319 | } |
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| 320 | |
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| 321 | sobj = rtems_rtl_find_obj_with_symbol (symbol); |
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[89c59be] | 322 | |
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| 323 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_DEPENDENCY)) |
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| 324 | printf ("rtl: depend: %s -> %s:%s\n", |
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| 325 | obj->oname, |
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| 326 | sobj == NULL ? "not-found" : sobj->oname, |
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| 327 | symname); |
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| 328 | |
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[03139d5b] | 329 | if (sobj != NULL) |
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| 330 | { |
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| 331 | if (rtems_rtl_obj_add_dependent (obj, sobj)) |
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| 332 | rtems_rtl_obj_inc_reference (sobj); |
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| 333 | } |
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| 334 | } |
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| 335 | |
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| 336 | return true; |
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| 337 | } |
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| 338 | |
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[ae5fe7e6] | 339 | static bool |
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[03139d5b] | 340 | rtems_rtl_elf_relocate_worker (rtems_rtl_obj* obj, |
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| 341 | int fd, |
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| 342 | rtems_rtl_obj_sect* sect, |
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| 343 | rtems_rtl_elf_reloc_handler handler, |
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| 344 | void* data) |
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[ae5fe7e6] | 345 | { |
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[f59d435d] | 346 | rtems_rtl_obj_cache* symbols; |
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| 347 | rtems_rtl_obj_cache* strings; |
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| 348 | rtems_rtl_obj_cache* relocs; |
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| 349 | rtems_rtl_obj_sect* targetsect; |
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| 350 | rtems_rtl_obj_sect* symsect; |
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| 351 | rtems_rtl_obj_sect* strtab; |
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| 352 | bool is_rela; |
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| 353 | size_t reloc_size; |
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| 354 | int reloc; |
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[ae5fe7e6] | 355 | |
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| 356 | /* |
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| 357 | * First check if the section the relocations are for exists. If it does not |
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| 358 | * exist ignore these relocations. They are most probably debug sections. |
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| 359 | */ |
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| 360 | targetsect = rtems_rtl_obj_find_section_by_index (obj, sect->info); |
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| 361 | if (!targetsect) |
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| 362 | return true; |
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| 363 | |
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[194eb403] | 364 | /* |
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| 365 | * The section muct has been loaded. It could be a separate section in an |
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| 366 | * archive and not loaded. |
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| 367 | */ |
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| 368 | if ((targetsect->flags & RTEMS_RTL_OBJ_SECT_LOAD) == 0) |
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| 369 | return true; |
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| 370 | |
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| 371 | |
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[ae5fe7e6] | 372 | rtems_rtl_obj_caches (&symbols, &strings, &relocs); |
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| 373 | |
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| 374 | if (!symbols || !strings || !relocs) |
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| 375 | return false; |
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| 376 | |
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| 377 | symsect = rtems_rtl_obj_find_section (obj, ".symtab"); |
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| 378 | if (!symsect) |
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| 379 | { |
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| 380 | rtems_rtl_set_error (EINVAL, "no .symtab section"); |
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| 381 | return false; |
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| 382 | } |
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| 383 | |
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| 384 | strtab = rtems_rtl_obj_find_section (obj, ".strtab"); |
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| 385 | if (!strtab) |
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| 386 | { |
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| 387 | rtems_rtl_set_error (EINVAL, "no .strtab section"); |
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| 388 | return false; |
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| 389 | } |
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| 390 | |
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| 391 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
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| 392 | printf ("rtl: relocation: %s, syms:%s\n", sect->name, symsect->name); |
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| 393 | |
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| 394 | /* |
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| 395 | * Handle the different relocation record types. |
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| 396 | */ |
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| 397 | is_rela = ((sect->flags & RTEMS_RTL_OBJ_SECT_RELA) == |
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| 398 | RTEMS_RTL_OBJ_SECT_RELA) ? true : false; |
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| 399 | reloc_size = is_rela ? sizeof (Elf_Rela) : sizeof (Elf_Rel); |
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| 400 | |
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| 401 | for (reloc = 0; reloc < (sect->size / reloc_size); ++reloc) |
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| 402 | { |
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[03139d5b] | 403 | uint8_t relbuf[reloc_size]; |
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| 404 | const Elf_Rela* rela = (const Elf_Rela*) relbuf; |
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| 405 | const Elf_Rel* rel = (const Elf_Rel*) relbuf; |
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| 406 | rtems_rtl_obj_sym* symbol = NULL; |
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| 407 | Elf_Sym sym; |
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| 408 | const char* symname = NULL; |
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| 409 | off_t off; |
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| 410 | Elf_Word rel_type; |
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| 411 | Elf_Word symvalue = 0; |
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| 412 | bool resolved; |
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[ae5fe7e6] | 413 | |
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| 414 | off = obj->ooffset + sect->offset + (reloc * reloc_size); |
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| 415 | |
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| 416 | if (!rtems_rtl_obj_cache_read_byval (relocs, fd, off, |
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| 417 | &relbuf[0], reloc_size)) |
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| 418 | return false; |
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| 419 | |
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[c6eead1] | 420 | /* |
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| 421 | * Read the symbol details. |
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| 422 | */ |
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[ae5fe7e6] | 423 | if (is_rela) |
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| 424 | off = (obj->ooffset + symsect->offset + |
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| 425 | (ELF_R_SYM (rela->r_info) * sizeof (sym))); |
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| 426 | else |
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| 427 | off = (obj->ooffset + symsect->offset + |
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| 428 | (ELF_R_SYM (rel->r_info) * sizeof (sym))); |
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| 429 | |
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| 430 | if (!rtems_rtl_obj_cache_read_byval (symbols, fd, off, |
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| 431 | &sym, sizeof (sym))) |
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| 432 | return false; |
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| 433 | |
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| 434 | /* |
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[803eac9] | 435 | * Only need the name of the symbol if global or a common symbol. |
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[ae5fe7e6] | 436 | */ |
---|
[b36c5209] | 437 | if (ELF_ST_TYPE (sym.st_info) == STT_OBJECT || |
---|
| 438 | ELF_ST_TYPE (sym.st_info) == STT_COMMON || |
---|
| 439 | ELF_ST_TYPE (sym.st_info) == STT_FUNC || |
---|
| 440 | ELF_ST_TYPE (sym.st_info) == STT_NOTYPE || |
---|
[194eb403] | 441 | ELF_ST_TYPE (sym.st_info) == STT_TLS || |
---|
[803eac9] | 442 | sym.st_shndx == SHN_COMMON) |
---|
[ae5fe7e6] | 443 | { |
---|
| 444 | size_t len; |
---|
| 445 | off = obj->ooffset + strtab->offset + sym.st_name; |
---|
| 446 | len = RTEMS_RTL_ELF_STRING_MAX; |
---|
| 447 | |
---|
| 448 | if (!rtems_rtl_obj_cache_read (strings, fd, off, |
---|
| 449 | (void**) &symname, &len)) |
---|
| 450 | return false; |
---|
| 451 | } |
---|
| 452 | |
---|
| 453 | /* |
---|
| 454 | * See if the record references an external symbol. If it does find the |
---|
| 455 | * symbol value. If the symbol cannot be found flag the object file as |
---|
[03139d5b] | 456 | * having unresolved externals and store the external. The load of an |
---|
[ae5fe7e6] | 457 | * object after this one may provide the unresolved externals. |
---|
| 458 | */ |
---|
| 459 | if (is_rela) |
---|
[03139d5b] | 460 | rel_type = ELF_R_TYPE(rela->r_info); |
---|
[ae5fe7e6] | 461 | else |
---|
[03139d5b] | 462 | rel_type = ELF_R_TYPE(rel->r_info); |
---|
[ae5fe7e6] | 463 | |
---|
[03139d5b] | 464 | resolved = true; |
---|
[ae5fe7e6] | 465 | |
---|
[03139d5b] | 466 | if (rtems_rtl_elf_rel_resolve_sym (rel_type)) |
---|
| 467 | resolved = rtems_rtl_elf_find_symbol (obj, |
---|
| 468 | &sym, symname, |
---|
| 469 | &symbol, &symvalue); |
---|
[ae5fe7e6] | 470 | |
---|
[03139d5b] | 471 | if (!handler (obj, |
---|
| 472 | is_rela, relbuf, targetsect, |
---|
| 473 | symbol, &sym, symname, symvalue, resolved, |
---|
| 474 | data)) |
---|
| 475 | return false; |
---|
[ae5fe7e6] | 476 | } |
---|
| 477 | |
---|
| 478 | /* |
---|
| 479 | * Set the unresolved externals status if there are unresolved externals. |
---|
| 480 | */ |
---|
| 481 | if (obj->unresolved) |
---|
| 482 | obj->flags |= RTEMS_RTL_OBJ_UNRESOLVED; |
---|
| 483 | |
---|
| 484 | return true; |
---|
| 485 | } |
---|
| 486 | |
---|
[03139d5b] | 487 | static bool |
---|
| 488 | rtems_rtl_elf_relocs_parser (rtems_rtl_obj* obj, |
---|
| 489 | int fd, |
---|
| 490 | rtems_rtl_obj_sect* sect, |
---|
| 491 | void* data) |
---|
| 492 | { |
---|
| 493 | bool r = rtems_rtl_elf_relocate_worker (obj, fd, sect, |
---|
| 494 | rtems_rtl_elf_reloc_parser, data); |
---|
| 495 | return r; |
---|
| 496 | } |
---|
| 497 | |
---|
| 498 | static bool |
---|
| 499 | rtems_rtl_elf_relocs_locator (rtems_rtl_obj* obj, |
---|
| 500 | int fd, |
---|
| 501 | rtems_rtl_obj_sect* sect, |
---|
| 502 | void* data) |
---|
| 503 | { |
---|
| 504 | return rtems_rtl_elf_relocate_worker (obj, fd, sect, |
---|
| 505 | rtems_rtl_elf_reloc_relocator, data); |
---|
| 506 | } |
---|
| 507 | |
---|
[ae5fe7e6] | 508 | bool |
---|
[f59d435d] | 509 | rtems_rtl_obj_relocate_unresolved (rtems_rtl_unresolv_reloc* reloc, |
---|
| 510 | rtems_rtl_obj_sym* sym) |
---|
[ae5fe7e6] | 511 | { |
---|
[b36c5209] | 512 | rtems_rtl_obj_sect* sect; |
---|
| 513 | bool is_rela; |
---|
| 514 | Elf_Word symvalue; |
---|
| 515 | rtems_rtl_obj* sobj; |
---|
| 516 | rtems_rtl_elf_rel_status rs; |
---|
[ae5fe7e6] | 517 | |
---|
[03139d5b] | 518 | is_rela = reloc->flags & 1; |
---|
[ae5fe7e6] | 519 | |
---|
| 520 | sect = rtems_rtl_obj_find_section_by_index (reloc->obj, reloc->sect); |
---|
| 521 | if (!sect) |
---|
| 522 | { |
---|
| 523 | rtems_rtl_set_error (ENOEXEC, "unresolved sect not found"); |
---|
| 524 | return false; |
---|
| 525 | } |
---|
| 526 | |
---|
| 527 | symvalue = (Elf_Word) (intptr_t) sym->value; |
---|
| 528 | if (is_rela) |
---|
| 529 | { |
---|
| 530 | Elf_Rela rela; |
---|
| 531 | rela.r_offset = reloc->rel[REL_R_OFFSET]; |
---|
| 532 | rela.r_info = reloc->rel[REL_R_INFO]; |
---|
| 533 | rela.r_addend = reloc->rel[REL_R_ADDEND]; |
---|
| 534 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
---|
[8bdbefe] | 535 | printf ("rtl: rela: sym:%d type:%d off:%08jx addend:%d\n", |
---|
[ae5fe7e6] | 536 | (int) ELF_R_SYM (rela.r_info), (int) ELF_R_TYPE (rela.r_info), |
---|
[8bdbefe] | 537 | (uintmax_t) rela.r_offset, (int) rela.r_addend); |
---|
[b36c5209] | 538 | rs = rtems_rtl_elf_relocate_rela (reloc->obj, &rela, sect, |
---|
| 539 | sym->name, sym->data, symvalue); |
---|
| 540 | if (rs != rtems_rtl_elf_rel_no_error) |
---|
[ae5fe7e6] | 541 | return false; |
---|
| 542 | } |
---|
| 543 | else |
---|
| 544 | { |
---|
| 545 | Elf_Rel rel; |
---|
| 546 | rel.r_offset = reloc->rel[REL_R_OFFSET]; |
---|
| 547 | rel.r_info = reloc->rel[REL_R_INFO]; |
---|
| 548 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
---|
[8bdbefe] | 549 | printf ("rtl: rel: sym:%d type:%d off:%08jx\n", |
---|
[ae5fe7e6] | 550 | (int) ELF_R_SYM (rel.r_info), (int) ELF_R_TYPE (rel.r_info), |
---|
[8bdbefe] | 551 | (uintmax_t) rel.r_offset); |
---|
[b36c5209] | 552 | rs = rtems_rtl_elf_relocate_rel (reloc->obj, &rel, sect, |
---|
| 553 | sym->name, sym->data, symvalue); |
---|
| 554 | if (rs != rtems_rtl_elf_rel_no_error) |
---|
[ae5fe7e6] | 555 | return false; |
---|
| 556 | } |
---|
| 557 | |
---|
[03139d5b] | 558 | if (reloc->obj->unresolved > 0) |
---|
[ae5fe7e6] | 559 | { |
---|
| 560 | --reloc->obj->unresolved; |
---|
[03139d5b] | 561 | if (reloc->obj->unresolved == 0) |
---|
[ae5fe7e6] | 562 | reloc->obj->flags &= ~RTEMS_RTL_OBJ_UNRESOLVED; |
---|
| 563 | } |
---|
| 564 | |
---|
[03139d5b] | 565 | sobj = rtems_rtl_find_obj_with_symbol (sym); |
---|
[89c59be] | 566 | |
---|
| 567 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_DEPENDENCY)) |
---|
| 568 | printf ("rtl: depend: %s -> %s:%s\n", |
---|
| 569 | reloc->obj->oname, |
---|
| 570 | sobj == NULL ? "not-found" : sobj->oname, |
---|
| 571 | sym->name); |
---|
| 572 | |
---|
[03139d5b] | 573 | if (sobj != NULL) |
---|
| 574 | { |
---|
| 575 | if (rtems_rtl_obj_add_dependent (reloc->obj, sobj)) |
---|
| 576 | rtems_rtl_obj_inc_reference (sobj); |
---|
| 577 | } |
---|
| 578 | |
---|
[ae5fe7e6] | 579 | return true; |
---|
| 580 | } |
---|
| 581 | |
---|
[803eac9] | 582 | /** |
---|
| 583 | * Common symbol iterator data. |
---|
| 584 | */ |
---|
| 585 | typedef struct |
---|
| 586 | { |
---|
| 587 | size_t size; /**< The size of the common section */ |
---|
| 588 | uint32_t alignment; /**< The alignment of the common section. */ |
---|
| 589 | } rtems_rtl_elf_common_data; |
---|
| 590 | |
---|
| 591 | static bool |
---|
| 592 | rtems_rtl_elf_common (rtems_rtl_obj* obj, |
---|
| 593 | int fd, |
---|
| 594 | rtems_rtl_obj_sect* sect, |
---|
| 595 | void* data) |
---|
| 596 | { |
---|
| 597 | rtems_rtl_elf_common_data* common = (rtems_rtl_elf_common_data*) data; |
---|
| 598 | rtems_rtl_obj_cache* symbols; |
---|
| 599 | int sym; |
---|
| 600 | |
---|
| 601 | rtems_rtl_obj_caches (&symbols, NULL, NULL); |
---|
| 602 | |
---|
| 603 | if (!symbols) |
---|
| 604 | return false; |
---|
| 605 | |
---|
| 606 | /* |
---|
| 607 | * Find the number size of the common section by finding all symbols that |
---|
| 608 | * reference the SHN_COMMON section. |
---|
| 609 | */ |
---|
| 610 | for (sym = 0; sym < (sect->size / sizeof (Elf_Sym)); ++sym) |
---|
| 611 | { |
---|
| 612 | Elf_Sym symbol; |
---|
| 613 | off_t off; |
---|
| 614 | |
---|
| 615 | off = obj->ooffset + sect->offset + (sym * sizeof (symbol)); |
---|
| 616 | |
---|
| 617 | if (!rtems_rtl_obj_cache_read_byval (symbols, fd, off, |
---|
| 618 | &symbol, sizeof (symbol))) |
---|
| 619 | return false; |
---|
| 620 | |
---|
| 621 | if ((symbol.st_shndx == SHN_COMMON) && |
---|
| 622 | ((ELF_ST_TYPE (symbol.st_info) == STT_OBJECT) || |
---|
| 623 | (ELF_ST_TYPE (symbol.st_info) == STT_COMMON))) |
---|
| 624 | { |
---|
| 625 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_SYMBOL)) |
---|
[6c9f017] | 626 | printf ("rtl: com:elf:%-2d bind:%-2d type:%-2d size:%d value:%d name:%d\n", |
---|
[803eac9] | 627 | sym, (int) ELF_ST_BIND (symbol.st_info), |
---|
| 628 | (int) ELF_ST_TYPE (symbol.st_info), |
---|
[6c9f017] | 629 | (int) symbol.st_size, (int) symbol.st_value, |
---|
| 630 | (int) symbol.st_name); |
---|
[803eac9] | 631 | /* |
---|
| 632 | * If the size is zero this is the first entry, it defines the common |
---|
| 633 | * section's aligment. The symbol's value is the alignment. |
---|
| 634 | */ |
---|
| 635 | if (common->size == 0) |
---|
| 636 | common->alignment = symbol.st_value; |
---|
| 637 | common->size += |
---|
| 638 | rtems_rtl_obj_align (common->size, symbol.st_value) + symbol.st_size; |
---|
| 639 | } |
---|
| 640 | } |
---|
| 641 | |
---|
| 642 | return true; |
---|
| 643 | } |
---|
| 644 | |
---|
[b36c5209] | 645 | /** |
---|
| 646 | * Struct to handle trampoline reloc recs in the unresolved table. |
---|
| 647 | */ |
---|
| 648 | typedef struct rtems_rtl_tramp_data |
---|
| 649 | { |
---|
| 650 | bool failure; |
---|
| 651 | rtems_rtl_obj* obj; |
---|
| 652 | size_t count; |
---|
| 653 | size_t total; |
---|
| 654 | } rtems_rtl_tramp_data; |
---|
| 655 | |
---|
| 656 | static bool |
---|
| 657 | rtems_rtl_elf_tramp_resolve_reloc (rtems_rtl_unresolv_rec* rec, |
---|
| 658 | void* data) |
---|
| 659 | { |
---|
| 660 | rtems_rtl_tramp_data* td = (rtems_rtl_tramp_data*) data; |
---|
| 661 | if (rec->type == rtems_rtl_trampoline_reloc) |
---|
| 662 | { |
---|
| 663 | const rtems_rtl_tramp_reloc* tramp = &rec->rec.tramp; |
---|
| 664 | |
---|
| 665 | ++td->total; |
---|
| 666 | |
---|
| 667 | if (tramp->obj == td->obj) |
---|
| 668 | { |
---|
| 669 | const rtems_rtl_obj_sect* targetsect; |
---|
| 670 | Elf_Byte st_info; |
---|
| 671 | Elf_Word symvalue; |
---|
| 672 | rtems_rtl_elf_rel_status rs; |
---|
| 673 | bool* failure = (bool*) data; |
---|
| 674 | const bool is_rela = (tramp->flags & 1) == 1; |
---|
| 675 | const bool unresolved = (tramp->flags & (1 << 1)) != 0; |
---|
| 676 | |
---|
| 677 | ++td->count; |
---|
| 678 | |
---|
| 679 | targetsect = rtems_rtl_obj_find_section_by_index (tramp->obj, tramp->sect); |
---|
| 680 | st_info = tramp->flags >> 8; |
---|
| 681 | symvalue = tramp->symvalue; |
---|
| 682 | |
---|
| 683 | if (is_rela) |
---|
| 684 | { |
---|
| 685 | Elf_Rela rela = { |
---|
| 686 | .r_offset = tramp->rel[REL_R_OFFSET], |
---|
| 687 | .r_info = tramp->rel[REL_R_INFO], |
---|
| 688 | .r_addend = tramp->rel[REL_R_ADDEND] |
---|
| 689 | }; |
---|
| 690 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
---|
| 691 | printf ("rtl: rela tramp: check: %c(%d)=%08jx type:%d off:%08jx addend:%d\n", |
---|
| 692 | ELF_ST_BIND (st_info) == STB_GLOBAL || |
---|
| 693 | ELF_ST_BIND (st_info) == STB_WEAK ? 'G' : 'L', |
---|
| 694 | (int) ELF_R_SYM (rela.r_info), |
---|
| 695 | (uintmax_t) symvalue, (int) ELF_R_TYPE (rela.r_info), |
---|
| 696 | (uintmax_t) rela.r_offset, (int) rela.r_addend); |
---|
| 697 | rs = rtems_rtl_elf_relocate_rela_tramp (tramp->obj, &rela, targetsect, |
---|
| 698 | NULL, st_info, symvalue); |
---|
| 699 | } |
---|
| 700 | else |
---|
| 701 | { |
---|
| 702 | Elf_Rel rel = { |
---|
| 703 | .r_offset = tramp->rel[REL_R_OFFSET], |
---|
| 704 | .r_info = tramp->rel[REL_R_INFO], |
---|
| 705 | }; |
---|
| 706 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
---|
| 707 | printf ("rtl: rel tramp: check: %c(%d)=%08jx type:%d off:%08jx\n", |
---|
| 708 | ELF_ST_BIND (st_info) == STB_GLOBAL || |
---|
| 709 | ELF_ST_BIND (st_info) == STB_WEAK ? 'G' : 'L', |
---|
| 710 | (int) ELF_R_SYM (rel.r_info), |
---|
| 711 | (uintmax_t) symvalue, (int) ELF_R_TYPE (rel.r_info), |
---|
| 712 | (uintmax_t) rel.r_offset); |
---|
| 713 | rs = rtems_rtl_elf_relocate_rel_tramp (tramp->obj, &rel, targetsect, |
---|
| 714 | NULL, st_info, symvalue); |
---|
| 715 | } |
---|
| 716 | |
---|
| 717 | if (unresolved || rs == rtems_rtl_elf_rel_tramp_add) |
---|
| 718 | tramp->obj->tramps_size += tramp->obj->tramp_size; |
---|
| 719 | if (rs == rtems_rtl_elf_rel_failure) |
---|
| 720 | { |
---|
| 721 | *failure = true; |
---|
| 722 | return true; |
---|
| 723 | } |
---|
| 724 | } |
---|
| 725 | } |
---|
| 726 | |
---|
| 727 | return false; |
---|
| 728 | } |
---|
| 729 | |
---|
[d8c70ba6] | 730 | static bool |
---|
| 731 | rtems_rtl_elf_alloc_trampoline (rtems_rtl_obj* obj, size_t unresolved) |
---|
| 732 | { |
---|
[b36c5209] | 733 | rtems_rtl_tramp_data td = { 0 }; |
---|
| 734 | td.obj = obj; |
---|
| 735 | /* |
---|
| 736 | * See which relocs are out of range and need a trampoline. |
---|
| 737 | */ |
---|
| 738 | rtems_rtl_unresolved_iterate (rtems_rtl_elf_tramp_resolve_reloc, &td); |
---|
| 739 | if (td.failure) |
---|
| 740 | return false; |
---|
| 741 | rtems_rtl_trampoline_remove (obj); |
---|
| 742 | obj->tramp_relocs = obj->tramp_size == 0 ? 0 : obj->tramps_size / obj->tramp_size; |
---|
| 743 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
---|
| 744 | printf ("rtl: tramp:elf: tramps: %zu count:%zu total:%zu\n", |
---|
| 745 | obj->tramp_relocs, td.count, td.total); |
---|
[d8c70ba6] | 746 | /* |
---|
| 747 | * Add on enough space to handle the unresolved externals that need to be |
---|
| 748 | * resolved at some point in time. They could all require fixups and |
---|
| 749 | * trampolines. |
---|
| 750 | */ |
---|
[b36c5209] | 751 | obj->tramps_size += obj->tramp_size * unresolved; |
---|
| 752 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
---|
| 753 | printf ("rtl: tramp:elf: slots: %zu (%zu)\n", |
---|
| 754 | obj->tramp_size == 0 ? 0 : obj->tramps_size / obj->tramp_size, |
---|
| 755 | obj->tramps_size); |
---|
[d8c70ba6] | 756 | return rtems_rtl_obj_alloc_trampoline (obj); |
---|
| 757 | } |
---|
| 758 | |
---|
[03139d5b] | 759 | static bool |
---|
| 760 | rtems_rtl_elf_dependents (rtems_rtl_obj* obj, rtems_rtl_elf_reloc_data* reloc) |
---|
| 761 | { |
---|
| 762 | /* |
---|
| 763 | * If there are dependencies and no unresolved externals allocate and size |
---|
| 764 | * the dependency table to the number of dependent object files. If there are |
---|
| 765 | * unresolved externals the number of dependencies is unknown at this point |
---|
| 766 | * in time so use dynamic allocation to allocate the block size number of |
---|
| 767 | * entries when the entries are added. |
---|
| 768 | */ |
---|
| 769 | if (reloc->dependents > 0 && reloc->unresolved == 0) |
---|
| 770 | { |
---|
| 771 | if (!rtems_rtl_obj_alloc_dependents (obj, reloc->dependents)) |
---|
| 772 | return false; |
---|
| 773 | } |
---|
| 774 | return true; |
---|
| 775 | } |
---|
| 776 | |
---|
[ae5fe7e6] | 777 | static bool |
---|
[b36c5209] | 778 | rtems_rtl_elf_symbols_load (rtems_rtl_obj* obj, |
---|
| 779 | int fd, |
---|
| 780 | rtems_rtl_obj_sect* sect, |
---|
| 781 | void* data) |
---|
[ae5fe7e6] | 782 | { |
---|
[f59d435d] | 783 | rtems_rtl_obj_cache* symbols; |
---|
| 784 | rtems_rtl_obj_cache* strings; |
---|
| 785 | rtems_rtl_obj_sect* strtab; |
---|
| 786 | int locals; |
---|
| 787 | int local_string_space; |
---|
| 788 | rtems_rtl_obj_sym* lsym; |
---|
| 789 | char* lstring; |
---|
| 790 | int globals; |
---|
| 791 | int global_string_space; |
---|
| 792 | rtems_rtl_obj_sym* gsym; |
---|
| 793 | char* gstring; |
---|
[803eac9] | 794 | size_t common_offset; |
---|
[f59d435d] | 795 | int sym; |
---|
[ae5fe7e6] | 796 | |
---|
| 797 | strtab = rtems_rtl_obj_find_section (obj, ".strtab"); |
---|
| 798 | if (!strtab) |
---|
| 799 | { |
---|
| 800 | rtems_rtl_set_error (EINVAL, "no .strtab section"); |
---|
| 801 | return false; |
---|
| 802 | } |
---|
| 803 | |
---|
| 804 | rtems_rtl_obj_caches (&symbols, &strings, NULL); |
---|
| 805 | |
---|
| 806 | if (!symbols || !strings) |
---|
| 807 | return false; |
---|
| 808 | |
---|
| 809 | /* |
---|
| 810 | * Find the number of globals and the amount of string space |
---|
| 811 | * needed. Also check for duplicate symbols. |
---|
| 812 | */ |
---|
| 813 | |
---|
[a2e1e30d] | 814 | globals = 0; |
---|
| 815 | global_string_space = 0; |
---|
| 816 | locals = 0; |
---|
| 817 | local_string_space = 0; |
---|
[ae5fe7e6] | 818 | |
---|
| 819 | for (sym = 0; sym < (sect->size / sizeof (Elf_Sym)); ++sym) |
---|
| 820 | { |
---|
| 821 | Elf_Sym symbol; |
---|
| 822 | off_t off; |
---|
| 823 | const char* name; |
---|
| 824 | size_t len; |
---|
| 825 | |
---|
| 826 | off = obj->ooffset + sect->offset + (sym * sizeof (symbol)); |
---|
| 827 | |
---|
| 828 | if (!rtems_rtl_obj_cache_read_byval (symbols, fd, off, |
---|
| 829 | &symbol, sizeof (symbol))) |
---|
| 830 | return false; |
---|
| 831 | |
---|
| 832 | off = obj->ooffset + strtab->offset + symbol.st_name; |
---|
| 833 | len = RTEMS_RTL_ELF_STRING_MAX; |
---|
| 834 | |
---|
| 835 | if (!rtems_rtl_obj_cache_read (strings, fd, off, (void**) &name, &len)) |
---|
| 836 | return false; |
---|
| 837 | |
---|
| 838 | /* |
---|
[a2e1e30d] | 839 | * Only keep the functions and global or weak symbols so place them in a |
---|
| 840 | * separate table to local symbols. Local symbols are not needed after the |
---|
| 841 | * object file has been loaded. Undefined symbols are NOTYPE so for locals |
---|
| 842 | * we need to make sure there is a valid seciton. |
---|
[ae5fe7e6] | 843 | */ |
---|
[803eac9] | 844 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_SYMBOL)) |
---|
[b36c5209] | 845 | printf ("rtl: sym:elf:%-4d name:%-4d: %-20s: bind:%-2d " \ |
---|
| 846 | "type:%-2d sect:%-5d size:%-5d value:%d\n", |
---|
[803eac9] | 847 | sym, (int) symbol.st_name, name, |
---|
| 848 | (int) ELF_ST_BIND (symbol.st_info), |
---|
| 849 | (int) ELF_ST_TYPE (symbol.st_info), |
---|
| 850 | symbol.st_shndx, |
---|
[b36c5209] | 851 | (int) symbol.st_size, |
---|
| 852 | (int) symbol.st_value); |
---|
[803eac9] | 853 | |
---|
[b36c5209] | 854 | /* |
---|
| 855 | * If a duplicate forget it. |
---|
| 856 | */ |
---|
| 857 | if (rtems_rtl_symbol_global_find (name)) |
---|
| 858 | continue; |
---|
[194eb403] | 859 | |
---|
[a2e1e30d] | 860 | if ((symbol.st_shndx != 0) && |
---|
| 861 | ((ELF_ST_TYPE (symbol.st_info) == STT_OBJECT) || |
---|
[803eac9] | 862 | (ELF_ST_TYPE (symbol.st_info) == STT_COMMON) || |
---|
[a2e1e30d] | 863 | (ELF_ST_TYPE (symbol.st_info) == STT_FUNC) || |
---|
| 864 | (ELF_ST_TYPE (symbol.st_info) == STT_NOTYPE))) |
---|
[ae5fe7e6] | 865 | { |
---|
[803eac9] | 866 | /* |
---|
| 867 | * There needs to be a valid section for the symbol. |
---|
| 868 | */ |
---|
[f59d435d] | 869 | rtems_rtl_obj_sect* symsect; |
---|
[a2e1e30d] | 870 | |
---|
| 871 | symsect = rtems_rtl_obj_find_section_by_index (obj, symbol.st_shndx); |
---|
[803eac9] | 872 | if (symsect != NULL) |
---|
[ae5fe7e6] | 873 | { |
---|
[a2e1e30d] | 874 | if ((ELF_ST_BIND (symbol.st_info) == STB_GLOBAL) || |
---|
| 875 | (ELF_ST_BIND (symbol.st_info) == STB_WEAK)) |
---|
[ae5fe7e6] | 876 | { |
---|
[a2e1e30d] | 877 | /* |
---|
| 878 | * If there is a globally exported symbol already present and this |
---|
[194eb403] | 879 | * symbol is not weak raise check if the object file being loaded is |
---|
| 880 | * from an archive. If the base image is built with text sections a |
---|
| 881 | * symbol with it's section will be linked into the base image and not |
---|
| 882 | * another symbol. If not an archive rause an error. |
---|
| 883 | * |
---|
| 884 | * If the symbol is weak and present globally ignore this symbol and |
---|
| 885 | * use the global one and if it is not present take this symbol global |
---|
| 886 | * or weak. We accept the first weak symbol we find and make it |
---|
| 887 | * globally exported. |
---|
[a2e1e30d] | 888 | */ |
---|
| 889 | if (rtems_rtl_symbol_global_find (name) && |
---|
| 890 | (ELF_ST_BIND (symbol.st_info) != STB_WEAK)) |
---|
| 891 | { |
---|
[194eb403] | 892 | if (!rtems_rtl_obj_aname_valid (obj)) |
---|
| 893 | { |
---|
| 894 | rtems_rtl_set_error (ENOMEM, "duplicate global symbol: %s", name); |
---|
| 895 | return false; |
---|
| 896 | } |
---|
[a2e1e30d] | 897 | } |
---|
| 898 | else |
---|
| 899 | { |
---|
[803eac9] | 900 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_SYMBOL)) |
---|
[b36c5209] | 901 | printf ("rtl: sym:elf:%-4d name:%-4d: %-20s: global\n", |
---|
[803eac9] | 902 | sym, (int) symbol.st_name, name); |
---|
[a2e1e30d] | 903 | ++globals; |
---|
| 904 | global_string_space += strlen (name) + 1; |
---|
| 905 | } |
---|
[ae5fe7e6] | 906 | } |
---|
[a2e1e30d] | 907 | else if (ELF_ST_BIND (symbol.st_info) == STB_LOCAL) |
---|
[ae5fe7e6] | 908 | { |
---|
[803eac9] | 909 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_SYMBOL)) |
---|
[b36c5209] | 910 | printf ("rtl: sym:elf:%-4d name:%-4d: %-20s: local\n", |
---|
[803eac9] | 911 | sym, (int) symbol.st_name, name); |
---|
[a2e1e30d] | 912 | ++locals; |
---|
| 913 | local_string_space += strlen (name) + 1; |
---|
[ae5fe7e6] | 914 | } |
---|
| 915 | } |
---|
| 916 | } |
---|
| 917 | } |
---|
| 918 | |
---|
[a2e1e30d] | 919 | if (locals) |
---|
[ae5fe7e6] | 920 | { |
---|
[f59d435d] | 921 | obj->local_size = locals * sizeof (rtems_rtl_obj_sym) + local_string_space; |
---|
[a2e1e30d] | 922 | obj->local_table = rtems_rtl_alloc_new (RTEMS_RTL_ALLOC_SYMBOL, |
---|
| 923 | obj->local_size, true); |
---|
| 924 | if (!obj->local_table) |
---|
| 925 | { |
---|
| 926 | obj->local_size = 0; |
---|
| 927 | rtems_rtl_set_error (ENOMEM, "no memory for obj local syms"); |
---|
| 928 | return false; |
---|
| 929 | } |
---|
| 930 | |
---|
| 931 | obj->local_syms = locals; |
---|
| 932 | } |
---|
[ae5fe7e6] | 933 | |
---|
[a2e1e30d] | 934 | if (globals) |
---|
| 935 | { |
---|
[f59d435d] | 936 | obj->global_size = globals * sizeof (rtems_rtl_obj_sym) + global_string_space; |
---|
[ae5fe7e6] | 937 | obj->global_table = rtems_rtl_alloc_new (RTEMS_RTL_ALLOC_SYMBOL, |
---|
| 938 | obj->global_size, true); |
---|
| 939 | if (!obj->global_table) |
---|
| 940 | { |
---|
[a2e1e30d] | 941 | if (locals) |
---|
| 942 | { |
---|
| 943 | rtems_rtl_alloc_del (RTEMS_RTL_ALLOC_SYMBOL, obj->local_table); |
---|
| 944 | obj->local_size = 0; |
---|
| 945 | obj->local_syms = 0; |
---|
| 946 | } |
---|
[ae5fe7e6] | 947 | obj->global_size = 0; |
---|
| 948 | rtems_rtl_set_error (ENOMEM, "no memory for obj global syms"); |
---|
| 949 | return false; |
---|
| 950 | } |
---|
| 951 | |
---|
| 952 | obj->global_syms = globals; |
---|
[a2e1e30d] | 953 | } |
---|
[ae5fe7e6] | 954 | |
---|
[a2e1e30d] | 955 | lsym = obj->local_table; |
---|
| 956 | lstring = |
---|
[f59d435d] | 957 | (((char*) obj->local_table) + (locals * sizeof (rtems_rtl_obj_sym))); |
---|
[a2e1e30d] | 958 | gsym = obj->global_table; |
---|
| 959 | gstring = |
---|
[f59d435d] | 960 | (((char*) obj->global_table) + (globals * sizeof (rtems_rtl_obj_sym))); |
---|
[a2e1e30d] | 961 | |
---|
[803eac9] | 962 | common_offset = 0; |
---|
| 963 | |
---|
[a2e1e30d] | 964 | for (sym = 0; sym < (sect->size / sizeof (Elf_Sym)); ++sym) |
---|
| 965 | { |
---|
[194eb403] | 966 | Elf_Sym symbol; |
---|
| 967 | off_t off; |
---|
| 968 | size_t len; |
---|
[ae5fe7e6] | 969 | |
---|
[a2e1e30d] | 970 | off = obj->ooffset + sect->offset + (sym * sizeof (symbol)); |
---|
[ae5fe7e6] | 971 | |
---|
[a2e1e30d] | 972 | if (!rtems_rtl_obj_cache_read_byval (symbols, fd, off, |
---|
| 973 | &symbol, sizeof (symbol))) |
---|
| 974 | { |
---|
[b36c5209] | 975 | if (obj->local_syms) |
---|
[ae5fe7e6] | 976 | { |
---|
[a2e1e30d] | 977 | rtems_rtl_alloc_del (RTEMS_RTL_ALLOC_SYMBOL, obj->local_table); |
---|
| 978 | obj->local_table = NULL; |
---|
| 979 | obj->local_size = 0; |
---|
| 980 | obj->local_syms = 0; |
---|
| 981 | } |
---|
[b36c5209] | 982 | if (obj->global_syms) |
---|
[a2e1e30d] | 983 | { |
---|
| 984 | rtems_rtl_alloc_del (RTEMS_RTL_ALLOC_SYMBOL, obj->global_table); |
---|
[ae5fe7e6] | 985 | obj->global_table = NULL; |
---|
| 986 | obj->global_syms = 0; |
---|
| 987 | obj->global_size = 0; |
---|
| 988 | } |
---|
[a2e1e30d] | 989 | return false; |
---|
| 990 | } |
---|
[ae5fe7e6] | 991 | |
---|
[a2e1e30d] | 992 | if ((symbol.st_shndx != 0) && |
---|
| 993 | ((ELF_ST_TYPE (symbol.st_info) == STT_OBJECT) || |
---|
[803eac9] | 994 | (ELF_ST_TYPE (symbol.st_info) == STT_COMMON) || |
---|
[a2e1e30d] | 995 | (ELF_ST_TYPE (symbol.st_info) == STT_FUNC) || |
---|
| 996 | (ELF_ST_TYPE (symbol.st_info) == STT_NOTYPE)) && |
---|
| 997 | ((ELF_ST_BIND (symbol.st_info) == STB_GLOBAL) || |
---|
| 998 | (ELF_ST_BIND (symbol.st_info) == STB_WEAK) || |
---|
| 999 | (ELF_ST_BIND (symbol.st_info) == STB_LOCAL))) |
---|
[194eb403] | 1000 | { |
---|
[b36c5209] | 1001 | rtems_rtl_obj_sym* osym; |
---|
| 1002 | char* string; |
---|
| 1003 | Elf_Word value; |
---|
| 1004 | const char* name; |
---|
[194eb403] | 1005 | |
---|
[b36c5209] | 1006 | off = obj->ooffset + strtab->offset + symbol.st_name; |
---|
| 1007 | len = RTEMS_RTL_ELF_STRING_MAX; |
---|
| 1008 | |
---|
| 1009 | if (!rtems_rtl_obj_cache_read (strings, fd, off, (void**) &name, &len)) |
---|
| 1010 | return false; |
---|
| 1011 | |
---|
| 1012 | /* |
---|
| 1013 | * If a duplicate forget it. |
---|
| 1014 | */ |
---|
| 1015 | if (rtems_rtl_symbol_global_find (name)) |
---|
| 1016 | continue; |
---|
| 1017 | |
---|
| 1018 | if ((ELF_ST_BIND (symbol.st_info) == STB_GLOBAL) || |
---|
| 1019 | (ELF_ST_BIND (symbol.st_info) == STB_WEAK)) |
---|
| 1020 | { |
---|
| 1021 | osym = gsym; |
---|
| 1022 | string = gstring; |
---|
| 1023 | gstring += strlen (name) + 1; |
---|
| 1024 | ++gsym; |
---|
| 1025 | } |
---|
| 1026 | else |
---|
[ae5fe7e6] | 1027 | { |
---|
[b36c5209] | 1028 | osym = lsym; |
---|
| 1029 | string = lstring; |
---|
| 1030 | lstring += strlen (name) + 1; |
---|
| 1031 | ++lsym; |
---|
| 1032 | } |
---|
[a2e1e30d] | 1033 | |
---|
[b36c5209] | 1034 | /* |
---|
| 1035 | * Allocate any common symbols in the common section. |
---|
| 1036 | */ |
---|
| 1037 | if (symbol.st_shndx == SHN_COMMON) |
---|
| 1038 | { |
---|
| 1039 | size_t value_off = rtems_rtl_obj_align (common_offset, |
---|
| 1040 | symbol.st_value); |
---|
| 1041 | common_offset = value_off + symbol.st_size; |
---|
| 1042 | value = value_off; |
---|
| 1043 | } |
---|
| 1044 | else |
---|
| 1045 | { |
---|
| 1046 | value = symbol.st_value; |
---|
| 1047 | } |
---|
[a2e1e30d] | 1048 | |
---|
[b36c5209] | 1049 | rtems_chain_set_off_chain (&osym->node); |
---|
| 1050 | memcpy (string, name, strlen (name) + 1); |
---|
| 1051 | osym->name = string; |
---|
| 1052 | osym->value = (uint8_t*) value; |
---|
| 1053 | osym->data = symbol.st_shndx; |
---|
[803eac9] | 1054 | |
---|
[b36c5209] | 1055 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_SYMBOL)) |
---|
| 1056 | printf ("rtl: sym:add:%-4d name:%-4d: %-20s: bind:%-2d " \ |
---|
| 1057 | "type:%-2d val:%-8p sect:%-3d size:%d\n", |
---|
| 1058 | sym, (int) symbol.st_name, osym->name, |
---|
| 1059 | (int) ELF_ST_BIND (symbol.st_info), |
---|
| 1060 | (int) ELF_ST_TYPE (symbol.st_info), |
---|
| 1061 | osym->value, symbol.st_shndx, |
---|
| 1062 | (int) symbol.st_size); |
---|
| 1063 | } |
---|
| 1064 | } |
---|
[a2e1e30d] | 1065 | |
---|
[b36c5209] | 1066 | return true; |
---|
| 1067 | } |
---|
[194eb403] | 1068 | |
---|
[b36c5209] | 1069 | static bool |
---|
| 1070 | rtems_rtl_elf_symbols_locate (rtems_rtl_obj* obj, |
---|
| 1071 | int fd, |
---|
| 1072 | rtems_rtl_obj_sect* sect, |
---|
| 1073 | void* data) |
---|
| 1074 | { |
---|
| 1075 | int sym; |
---|
[194eb403] | 1076 | |
---|
[b36c5209] | 1077 | for (sym = 0; sym < obj->local_syms; ++sym) |
---|
| 1078 | { |
---|
| 1079 | rtems_rtl_obj_sym* osym = &obj->local_table[sym]; |
---|
| 1080 | rtems_rtl_obj_sect* symsect; |
---|
| 1081 | symsect = rtems_rtl_obj_find_section_by_index (obj, osym->data); |
---|
| 1082 | if (symsect) |
---|
| 1083 | { |
---|
| 1084 | osym->value += (intptr_t) symsect->base; |
---|
| 1085 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_SYMBOL)) |
---|
| 1086 | printf ("rtl: sym:locate:local :%-4d name: %-20s val:%-8p sect:%-3d (%s, %p)\n", |
---|
| 1087 | sym, osym->name, osym->value, osym->data, |
---|
| 1088 | symsect->name, symsect->base); |
---|
| 1089 | } |
---|
| 1090 | } |
---|
[194eb403] | 1091 | |
---|
[b36c5209] | 1092 | for (sym = 0; sym < obj->global_syms; ++sym) |
---|
| 1093 | { |
---|
| 1094 | rtems_rtl_obj_sym* osym = &obj->global_table[sym]; |
---|
| 1095 | rtems_rtl_obj_sect* symsect; |
---|
| 1096 | symsect = rtems_rtl_obj_find_section_by_index (obj, osym->data); |
---|
| 1097 | if (symsect) |
---|
| 1098 | { |
---|
| 1099 | osym->value += (intptr_t) symsect->base; |
---|
[194eb403] | 1100 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_SYMBOL)) |
---|
[b36c5209] | 1101 | printf ("rtl: sym:locate:global:%-4d name: %-20s val:%-8p sect:%-3d (%s, %p)\n", |
---|
| 1102 | sym, osym->name, osym->value, osym->data, |
---|
| 1103 | symsect->name, symsect->base); |
---|
[ae5fe7e6] | 1104 | } |
---|
[a2e1e30d] | 1105 | } |
---|
[ae5fe7e6] | 1106 | |
---|
[b36c5209] | 1107 | if (obj->global_size) |
---|
[ae5fe7e6] | 1108 | rtems_rtl_symbol_obj_add (obj); |
---|
| 1109 | |
---|
| 1110 | return true; |
---|
| 1111 | } |
---|
| 1112 | |
---|
[6c9f017] | 1113 | static bool |
---|
| 1114 | rtems_rtl_elf_arch_alloc (rtems_rtl_obj* obj, |
---|
| 1115 | int fd, |
---|
| 1116 | rtems_rtl_obj_sect* sect, |
---|
| 1117 | void* data) |
---|
| 1118 | { |
---|
| 1119 | if (rtems_rtl_obj_sect_is_arch_alloc (sect)) |
---|
| 1120 | return rtems_rtl_elf_arch_section_alloc (obj, sect); |
---|
| 1121 | return true; |
---|
| 1122 | } |
---|
| 1123 | |
---|
| 1124 | static bool |
---|
| 1125 | rtems_rtl_elf_arch_free (rtems_rtl_obj* obj) |
---|
| 1126 | { |
---|
| 1127 | int index = -1; |
---|
| 1128 | while (true) |
---|
| 1129 | { |
---|
| 1130 | rtems_rtl_obj_sect* sect; |
---|
| 1131 | sect = rtems_rtl_obj_find_section_by_mask (obj, |
---|
| 1132 | index, |
---|
| 1133 | RTEMS_RTL_OBJ_SECT_ARCH_ALLOC); |
---|
| 1134 | if (sect == NULL) |
---|
| 1135 | break; |
---|
| 1136 | if (!rtems_rtl_elf_arch_section_free (obj, sect)) |
---|
| 1137 | return false; |
---|
| 1138 | index = sect->section; |
---|
| 1139 | } |
---|
| 1140 | return true; |
---|
| 1141 | } |
---|
| 1142 | |
---|
[ae5fe7e6] | 1143 | static bool |
---|
[f59d435d] | 1144 | rtems_rtl_elf_loader (rtems_rtl_obj* obj, |
---|
| 1145 | int fd, |
---|
| 1146 | rtems_rtl_obj_sect* sect, |
---|
| 1147 | void* data) |
---|
[ae5fe7e6] | 1148 | { |
---|
| 1149 | uint8_t* base_offset; |
---|
| 1150 | size_t len; |
---|
| 1151 | |
---|
| 1152 | if (lseek (fd, obj->ooffset + sect->offset, SEEK_SET) < 0) |
---|
| 1153 | { |
---|
| 1154 | rtems_rtl_set_error (errno, "section load seek failed"); |
---|
| 1155 | return false; |
---|
| 1156 | } |
---|
| 1157 | |
---|
| 1158 | base_offset = sect->base; |
---|
| 1159 | len = sect->size; |
---|
| 1160 | |
---|
| 1161 | while (len) |
---|
| 1162 | { |
---|
| 1163 | ssize_t r = read (fd, base_offset, len); |
---|
| 1164 | if (r <= 0) |
---|
| 1165 | { |
---|
| 1166 | rtems_rtl_set_error (errno, "section load read failed"); |
---|
| 1167 | return false; |
---|
| 1168 | } |
---|
| 1169 | base_offset += r; |
---|
| 1170 | len -= r; |
---|
| 1171 | } |
---|
| 1172 | |
---|
| 1173 | return true; |
---|
| 1174 | } |
---|
| 1175 | |
---|
| 1176 | static bool |
---|
[f59d435d] | 1177 | rtems_rtl_elf_parse_sections (rtems_rtl_obj* obj, int fd, Elf_Ehdr* ehdr) |
---|
[ae5fe7e6] | 1178 | { |
---|
[f59d435d] | 1179 | rtems_rtl_obj_cache* sects; |
---|
| 1180 | rtems_rtl_obj_cache* strings; |
---|
| 1181 | int section; |
---|
| 1182 | off_t sectstroff; |
---|
| 1183 | off_t off; |
---|
| 1184 | Elf_Shdr shdr; |
---|
[ae5fe7e6] | 1185 | |
---|
| 1186 | rtems_rtl_obj_caches (§s, &strings, NULL); |
---|
| 1187 | |
---|
| 1188 | if (!sects || !strings) |
---|
| 1189 | return false; |
---|
| 1190 | |
---|
| 1191 | /* |
---|
| 1192 | * Get the offset to the section string table. |
---|
| 1193 | */ |
---|
| 1194 | off = obj->ooffset + ehdr->e_shoff + (ehdr->e_shstrndx * ehdr->e_shentsize); |
---|
| 1195 | |
---|
| 1196 | if (!rtems_rtl_obj_cache_read_byval (sects, fd, off, &shdr, sizeof (shdr))) |
---|
| 1197 | return false; |
---|
| 1198 | |
---|
| 1199 | if (shdr.sh_type != SHT_STRTAB) |
---|
| 1200 | { |
---|
| 1201 | rtems_rtl_set_error (EINVAL, "bad .sectstr section type"); |
---|
| 1202 | return false; |
---|
| 1203 | } |
---|
| 1204 | |
---|
| 1205 | sectstroff = obj->ooffset + shdr.sh_offset; |
---|
| 1206 | |
---|
| 1207 | for (section = 0; section < ehdr->e_shnum; ++section) |
---|
| 1208 | { |
---|
[194eb403] | 1209 | char* name; |
---|
| 1210 | size_t len; |
---|
[ae5fe7e6] | 1211 | uint32_t flags; |
---|
| 1212 | |
---|
[580466c] | 1213 | /* |
---|
| 1214 | * Make sure section is at least 32bits to avoid 16-bit overflow errors. |
---|
| 1215 | */ |
---|
[fc523ac8] | 1216 | off = obj->ooffset + ehdr->e_shoff + (((uint32_t) section) * ehdr->e_shentsize); |
---|
[ae5fe7e6] | 1217 | |
---|
[75386e11] | 1218 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_DETAIL)) |
---|
| 1219 | printf ("rtl: section header: %2d: offset=%d\n", section, (int) off); |
---|
| 1220 | |
---|
[ae5fe7e6] | 1221 | if (!rtems_rtl_obj_cache_read_byval (sects, fd, off, &shdr, sizeof (shdr))) |
---|
| 1222 | return false; |
---|
| 1223 | |
---|
[194eb403] | 1224 | len = RTEMS_RTL_ELF_STRING_MAX; |
---|
| 1225 | if (!rtems_rtl_obj_cache_read (strings, fd, |
---|
| 1226 | sectstroff + shdr.sh_name, |
---|
| 1227 | (void**) &name, &len)) |
---|
| 1228 | return false; |
---|
| 1229 | |
---|
[bba48d9] | 1230 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_DETAIL)) |
---|
[194eb403] | 1231 | printf ("rtl: section: %2d: name=%s type=%d flags=%08x link=%d info=%d\n", |
---|
| 1232 | section, name, (int) shdr.sh_type, (unsigned int) shdr.sh_flags, |
---|
[bba48d9] | 1233 | (int) shdr.sh_link, (int) shdr.sh_info); |
---|
| 1234 | |
---|
[803eac9] | 1235 | flags = 0; |
---|
| 1236 | |
---|
[ae5fe7e6] | 1237 | switch (shdr.sh_type) |
---|
| 1238 | { |
---|
| 1239 | case SHT_NULL: |
---|
| 1240 | /* |
---|
| 1241 | * Ignore. |
---|
| 1242 | */ |
---|
| 1243 | break; |
---|
| 1244 | |
---|
| 1245 | case SHT_PROGBITS: |
---|
| 1246 | /* |
---|
| 1247 | * There are 2 program bits sections. One is the program text and the |
---|
| 1248 | * other is the program data. The program text is flagged |
---|
| 1249 | * alloc/executable and the program data is flagged alloc/writable. |
---|
| 1250 | */ |
---|
| 1251 | if ((shdr.sh_flags & SHF_ALLOC) == SHF_ALLOC) |
---|
| 1252 | { |
---|
| 1253 | if ((shdr.sh_flags & SHF_EXECINSTR) == SHF_EXECINSTR) |
---|
| 1254 | flags = RTEMS_RTL_OBJ_SECT_TEXT | RTEMS_RTL_OBJ_SECT_LOAD; |
---|
| 1255 | else if ((shdr.sh_flags & SHF_WRITE) == SHF_WRITE) |
---|
| 1256 | flags = RTEMS_RTL_OBJ_SECT_DATA | RTEMS_RTL_OBJ_SECT_LOAD; |
---|
| 1257 | else |
---|
| 1258 | flags = RTEMS_RTL_OBJ_SECT_CONST | RTEMS_RTL_OBJ_SECT_LOAD; |
---|
| 1259 | } |
---|
| 1260 | break; |
---|
| 1261 | |
---|
| 1262 | case SHT_NOBITS: |
---|
| 1263 | /* |
---|
| 1264 | * There is 1 NOBIT section which is the .bss section. There is nothing |
---|
| 1265 | * but a definition as the .bss is just a clear region of memory. |
---|
| 1266 | */ |
---|
| 1267 | if ((shdr.sh_flags & (SHF_ALLOC | SHF_WRITE)) == (SHF_ALLOC | SHF_WRITE)) |
---|
| 1268 | flags = RTEMS_RTL_OBJ_SECT_BSS | RTEMS_RTL_OBJ_SECT_ZERO; |
---|
| 1269 | break; |
---|
| 1270 | |
---|
| 1271 | case SHT_RELA: |
---|
[194eb403] | 1272 | flags = RTEMS_RTL_OBJ_SECT_RELA | RTEMS_RTL_OBJ_SECT_LOAD; |
---|
[ae5fe7e6] | 1273 | break; |
---|
| 1274 | |
---|
| 1275 | case SHT_REL: |
---|
| 1276 | /* |
---|
| 1277 | * The sh_link holds the section index for the symbol table. The sh_info |
---|
| 1278 | * holds the section index the relocations apply to. |
---|
| 1279 | */ |
---|
[194eb403] | 1280 | flags = RTEMS_RTL_OBJ_SECT_REL | RTEMS_RTL_OBJ_SECT_LOAD; |
---|
[ae5fe7e6] | 1281 | break; |
---|
| 1282 | |
---|
| 1283 | case SHT_SYMTAB: |
---|
| 1284 | flags = RTEMS_RTL_OBJ_SECT_SYM; |
---|
| 1285 | break; |
---|
| 1286 | |
---|
| 1287 | case SHT_STRTAB: |
---|
| 1288 | flags = RTEMS_RTL_OBJ_SECT_STR; |
---|
| 1289 | break; |
---|
| 1290 | |
---|
[4408603] | 1291 | case SHT_INIT_ARRAY: |
---|
| 1292 | /* |
---|
| 1293 | * Constructors are text and need to be loaded. |
---|
| 1294 | */ |
---|
| 1295 | flags = (RTEMS_RTL_OBJ_SECT_CTOR | |
---|
| 1296 | RTEMS_RTL_OBJ_SECT_TEXT | |
---|
| 1297 | RTEMS_RTL_OBJ_SECT_LOAD); |
---|
| 1298 | break; |
---|
| 1299 | |
---|
| 1300 | case SHT_FINI_ARRAY: |
---|
| 1301 | /* |
---|
| 1302 | * Destructors are text and need to be loaded. |
---|
| 1303 | */ |
---|
| 1304 | flags = (RTEMS_RTL_OBJ_SECT_DTOR | |
---|
| 1305 | RTEMS_RTL_OBJ_SECT_TEXT | |
---|
| 1306 | RTEMS_RTL_OBJ_SECT_LOAD); |
---|
| 1307 | break; |
---|
| 1308 | |
---|
[ae5fe7e6] | 1309 | default: |
---|
[c6eead1] | 1310 | /* |
---|
[bba48d9] | 1311 | * See if there are architecture specific flags? |
---|
[c6eead1] | 1312 | */ |
---|
| 1313 | flags = rtems_rtl_elf_section_flags (obj, &shdr); |
---|
| 1314 | if (flags == 0) |
---|
| 1315 | { |
---|
| 1316 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_WARNING)) |
---|
| 1317 | printf ("rtl: unsupported section: %2d: type=%02d flags=%02x\n", |
---|
| 1318 | section, (int) shdr.sh_type, (int) shdr.sh_flags); |
---|
| 1319 | } |
---|
[ae5fe7e6] | 1320 | break; |
---|
| 1321 | } |
---|
| 1322 | |
---|
| 1323 | if (flags != 0) |
---|
| 1324 | { |
---|
[194eb403] | 1325 | /* |
---|
| 1326 | * If the object file is part of a library check the section's name. If it |
---|
| 1327 | * starts with '.text.*' see if the last part is a global symbol. If a |
---|
| 1328 | * global symbol exists we have to assume the symbol in the archive is a |
---|
| 1329 | * duplicate can can be ignored. |
---|
| 1330 | */ |
---|
| 1331 | if (rtems_rtl_obj_aname_valid (obj)) |
---|
| 1332 | { |
---|
| 1333 | const char* symname = rtems_rtl_elf_separated_section (name); |
---|
| 1334 | if (symname != NULL && rtems_rtl_symbol_global_find (symname)) |
---|
| 1335 | flags &= ~RTEMS_RTL_OBJ_SECT_LOAD; |
---|
| 1336 | } |
---|
[ae5fe7e6] | 1337 | |
---|
[bba48d9] | 1338 | /* |
---|
| 1339 | * If link ordering this section must appear in the same order in memory |
---|
| 1340 | * as the linked-to section relative to the sections it loads with. |
---|
| 1341 | */ |
---|
| 1342 | if ((shdr.sh_flags & SHF_LINK_ORDER) != 0) |
---|
| 1343 | flags |= RTEMS_RTL_OBJ_SECT_LINK; |
---|
| 1344 | |
---|
[4408603] | 1345 | /* |
---|
[194eb403] | 1346 | * Some architexctures have a named PROGBIT section for INIT/FINI. |
---|
[4408603] | 1347 | */ |
---|
[ae5fe7e6] | 1348 | if (strcmp (".ctors", name) == 0) |
---|
| 1349 | flags |= RTEMS_RTL_OBJ_SECT_CTOR; |
---|
| 1350 | if (strcmp (".dtors", name) == 0) |
---|
| 1351 | flags |= RTEMS_RTL_OBJ_SECT_DTOR; |
---|
| 1352 | |
---|
[c6eead1] | 1353 | if (rtems_rtl_elf_unwind_parse (obj, name, flags)) |
---|
| 1354 | { |
---|
| 1355 | flags &= ~(RTEMS_RTL_OBJ_SECT_TEXT | RTEMS_RTL_OBJ_SECT_CONST); |
---|
| 1356 | flags |= RTEMS_RTL_OBJ_SECT_EH; |
---|
| 1357 | } |
---|
| 1358 | |
---|
[6c9f017] | 1359 | /* |
---|
| 1360 | * Architecture specific parsing. Modified or extends the flags. |
---|
| 1361 | */ |
---|
| 1362 | flags = rtems_rtl_elf_arch_parse_section (obj, section, name, &shdr, flags); |
---|
| 1363 | if (flags == 0) |
---|
| 1364 | { |
---|
| 1365 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_WARNING)) |
---|
| 1366 | printf ("rtl: unsupported section: %2d: type=%02d flags=%02x\n", |
---|
| 1367 | section, (int) shdr.sh_type, (int) shdr.sh_flags); |
---|
| 1368 | rtems_rtl_set_error (ENOMEM, "invalid architecture section: %s", name); |
---|
| 1369 | return false; |
---|
| 1370 | } |
---|
| 1371 | |
---|
| 1372 | /* |
---|
| 1373 | * Add the section. |
---|
| 1374 | */ |
---|
[ae5fe7e6] | 1375 | if (!rtems_rtl_obj_add_section (obj, section, name, |
---|
| 1376 | shdr.sh_size, shdr.sh_offset, |
---|
| 1377 | shdr.sh_addralign, shdr.sh_link, |
---|
| 1378 | shdr.sh_info, flags)) |
---|
| 1379 | return false; |
---|
| 1380 | } |
---|
| 1381 | } |
---|
| 1382 | |
---|
| 1383 | return true; |
---|
| 1384 | } |
---|
| 1385 | |
---|
[803eac9] | 1386 | static bool |
---|
| 1387 | rtems_rtl_elf_add_common (rtems_rtl_obj* obj, size_t size, uint32_t alignment) |
---|
| 1388 | { |
---|
| 1389 | if (size > 0) |
---|
| 1390 | { |
---|
| 1391 | if (!rtems_rtl_obj_add_section (obj, SHN_COMMON, ".common.rtems.rtl", |
---|
| 1392 | size, 0, alignment, 0, 0, |
---|
| 1393 | RTEMS_RTL_OBJ_SECT_BSS | RTEMS_RTL_OBJ_SECT_ZERO)) |
---|
| 1394 | return false; |
---|
| 1395 | } |
---|
| 1396 | return true; |
---|
| 1397 | } |
---|
| 1398 | |
---|
[ae5fe7e6] | 1399 | bool |
---|
[f59d435d] | 1400 | rtems_rtl_elf_file_check (rtems_rtl_obj* obj, int fd) |
---|
[ae5fe7e6] | 1401 | { |
---|
[f59d435d] | 1402 | rtems_rtl_obj_cache* header; |
---|
| 1403 | Elf_Ehdr ehdr; |
---|
[ae5fe7e6] | 1404 | |
---|
| 1405 | rtems_rtl_obj_caches (&header, NULL, NULL); |
---|
| 1406 | |
---|
| 1407 | if (!rtems_rtl_obj_cache_read_byval (header, fd, obj->ooffset, |
---|
| 1408 | &ehdr, sizeof (ehdr))) |
---|
| 1409 | return false; |
---|
| 1410 | |
---|
| 1411 | /* |
---|
| 1412 | * Check we have a valid ELF file. |
---|
| 1413 | */ |
---|
| 1414 | if ((memcmp (ELFMAG, ehdr.e_ident, SELFMAG) != 0) |
---|
| 1415 | || ehdr.e_ident[EI_CLASS] != ELFCLASS) |
---|
| 1416 | { |
---|
| 1417 | return false; |
---|
| 1418 | } |
---|
| 1419 | |
---|
| 1420 | if ((ehdr.e_ident[EI_VERSION] != EV_CURRENT) |
---|
| 1421 | || (ehdr.e_version != EV_CURRENT) |
---|
| 1422 | || (ehdr.e_ident[EI_DATA] != ELFDEFNNAME (MACHDEP_ENDIANNESS))) |
---|
| 1423 | { |
---|
| 1424 | return false; |
---|
| 1425 | } |
---|
| 1426 | |
---|
| 1427 | return true; |
---|
| 1428 | } |
---|
| 1429 | |
---|
[c6eead1] | 1430 | static bool |
---|
[f59d435d] | 1431 | rtems_rtl_elf_load_linkmap (rtems_rtl_obj* obj) |
---|
[ae5fe7e6] | 1432 | { |
---|
| 1433 | rtems_chain_control* sections = NULL; |
---|
| 1434 | rtems_chain_node* node = NULL; |
---|
| 1435 | int sec_num = 0; |
---|
[c6eead1] | 1436 | section_detail* sd; |
---|
[ae5fe7e6] | 1437 | int i = 0; |
---|
[194eb403] | 1438 | size_t m; |
---|
[ae5fe7e6] | 1439 | |
---|
[c6eead1] | 1440 | /* |
---|
[194eb403] | 1441 | * The section masks to add to the linkmap. |
---|
[c6eead1] | 1442 | */ |
---|
[194eb403] | 1443 | const uint32_t sect_mask[] = { |
---|
| 1444 | RTEMS_RTL_OBJ_SECT_TEXT | RTEMS_RTL_OBJ_SECT_LOAD, |
---|
| 1445 | RTEMS_RTL_OBJ_SECT_CONST | RTEMS_RTL_OBJ_SECT_LOAD, |
---|
| 1446 | RTEMS_RTL_OBJ_SECT_DATA | RTEMS_RTL_OBJ_SECT_LOAD, |
---|
| 1447 | RTEMS_RTL_OBJ_SECT_BSS |
---|
| 1448 | }; |
---|
| 1449 | const size_t sect_masks = sizeof (sect_mask) / sizeof (sect_mask[0]); |
---|
[ae5fe7e6] | 1450 | |
---|
[194eb403] | 1451 | /* |
---|
| 1452 | * Caculate the size of sections' name. |
---|
| 1453 | */ |
---|
| 1454 | for (m = 0; m < sect_masks; ++m) |
---|
[ae5fe7e6] | 1455 | { |
---|
| 1456 | sections = &obj->sections; |
---|
| 1457 | node = rtems_chain_first (sections); |
---|
| 1458 | while (!rtems_chain_is_tail (sections, node)) |
---|
| 1459 | { |
---|
[f59d435d] | 1460 | rtems_rtl_obj_sect* sect = (rtems_rtl_obj_sect*) node; |
---|
[194eb403] | 1461 | const uint32_t mask = sect_mask[m]; |
---|
| 1462 | if ((sect->size != 0) && ((sect->flags & mask) == mask)) |
---|
[ae5fe7e6] | 1463 | { |
---|
| 1464 | ++sec_num; |
---|
| 1465 | } |
---|
| 1466 | node = rtems_chain_next (node); |
---|
| 1467 | } |
---|
| 1468 | } |
---|
| 1469 | |
---|
| 1470 | obj->obj_num = 1; |
---|
[c6eead1] | 1471 | obj->linkmap = rtems_rtl_alloc_new (RTEMS_RTL_ALLOC_OBJECT, |
---|
| 1472 | sizeof(struct link_map) + |
---|
| 1473 | sec_num * sizeof (section_detail), true); |
---|
| 1474 | if (!obj->linkmap) |
---|
[ae5fe7e6] | 1475 | { |
---|
[c6eead1] | 1476 | rtems_rtl_set_error (ENOMEM, "no memory for obj linkmap"); |
---|
[ae5fe7e6] | 1477 | return false; |
---|
| 1478 | } |
---|
| 1479 | |
---|
[c6eead1] | 1480 | obj->linkmap->name = obj->oname; |
---|
| 1481 | obj->linkmap->sec_num = sec_num; |
---|
| 1482 | obj->linkmap->sec_detail = (section_detail*) (obj->linkmap + 1); |
---|
| 1483 | obj->linkmap->rpathlen = 0; |
---|
| 1484 | obj->linkmap->rpath = NULL; |
---|
| 1485 | obj->linkmap->l_next = NULL; |
---|
| 1486 | obj->linkmap->l_prev = NULL; |
---|
| 1487 | obj->linkmap->sec_addr[rap_text] = obj->text_base; |
---|
| 1488 | obj->linkmap->sec_addr[rap_const] = obj->const_base; |
---|
| 1489 | obj->linkmap->sec_addr[rap_data] = obj->data_base; |
---|
| 1490 | obj->linkmap->sec_addr[rap_bss] = obj->bss_base; |
---|
| 1491 | |
---|
| 1492 | sd = obj->linkmap->sec_detail; |
---|
[ae5fe7e6] | 1493 | sections = &obj->sections; |
---|
| 1494 | node = rtems_chain_first (sections); |
---|
[c6eead1] | 1495 | |
---|
[194eb403] | 1496 | for (m = 0; m < sect_masks; ++m) |
---|
[ae5fe7e6] | 1497 | { |
---|
| 1498 | sections = &obj->sections; |
---|
| 1499 | node = rtems_chain_first (sections); |
---|
| 1500 | while (!rtems_chain_is_tail (sections, node)) |
---|
| 1501 | { |
---|
[f59d435d] | 1502 | rtems_rtl_obj_sect* sect = (rtems_rtl_obj_sect*) node; |
---|
[194eb403] | 1503 | const uint32_t mask = sect_mask[m]; |
---|
[ae5fe7e6] | 1504 | |
---|
[194eb403] | 1505 | if ((sect->size != 0) && ((sect->flags & mask) == mask)) |
---|
[ae5fe7e6] | 1506 | { |
---|
| 1507 | sd[i].name = sect->name; |
---|
| 1508 | sd[i].size = sect->size; |
---|
[194eb403] | 1509 | if ((mask & RTEMS_RTL_OBJ_SECT_TEXT) != 0) |
---|
[ae5fe7e6] | 1510 | { |
---|
| 1511 | sd[i].rap_id = rap_text; |
---|
| 1512 | sd[i].offset = sect->base - obj->text_base; |
---|
| 1513 | } |
---|
[194eb403] | 1514 | if ((mask & RTEMS_RTL_OBJ_SECT_CONST) != 0) |
---|
[ae5fe7e6] | 1515 | { |
---|
| 1516 | sd[i].rap_id = rap_const; |
---|
| 1517 | sd[i].offset = sect->base - obj->const_base; |
---|
| 1518 | } |
---|
[194eb403] | 1519 | if ((mask & RTEMS_RTL_OBJ_SECT_DATA) != 0) |
---|
[ae5fe7e6] | 1520 | { |
---|
| 1521 | sd[i].rap_id = rap_data; |
---|
| 1522 | sd[i].offset = sect->base - obj->data_base; |
---|
| 1523 | } |
---|
[194eb403] | 1524 | if ((mask & RTEMS_RTL_OBJ_SECT_BSS) != 0) |
---|
[ae5fe7e6] | 1525 | { |
---|
| 1526 | sd[i].rap_id = rap_bss; |
---|
| 1527 | sd[i].offset = sect->base - obj->bss_base; |
---|
| 1528 | } |
---|
| 1529 | |
---|
| 1530 | ++i; |
---|
| 1531 | } |
---|
| 1532 | node = rtems_chain_next (node); |
---|
| 1533 | } |
---|
| 1534 | } |
---|
| 1535 | |
---|
| 1536 | return true; |
---|
| 1537 | } |
---|
| 1538 | |
---|
| 1539 | bool |
---|
[f59d435d] | 1540 | rtems_rtl_elf_file_load (rtems_rtl_obj* obj, int fd) |
---|
[ae5fe7e6] | 1541 | { |
---|
[803eac9] | 1542 | rtems_rtl_obj_cache* header; |
---|
| 1543 | Elf_Ehdr ehdr; |
---|
[03139d5b] | 1544 | rtems_rtl_elf_reloc_data relocs = { 0 }; |
---|
| 1545 | rtems_rtl_elf_common_data common = { 0 }; |
---|
[ae5fe7e6] | 1546 | |
---|
| 1547 | rtems_rtl_obj_caches (&header, NULL, NULL); |
---|
| 1548 | |
---|
| 1549 | if (!rtems_rtl_obj_cache_read_byval (header, fd, obj->ooffset, |
---|
| 1550 | &ehdr, sizeof (ehdr))) |
---|
| 1551 | return false; |
---|
| 1552 | |
---|
| 1553 | /* |
---|
| 1554 | * Check we have a valid ELF file. |
---|
| 1555 | */ |
---|
| 1556 | if ((memcmp (ELFMAG, ehdr.e_ident, SELFMAG) != 0) |
---|
| 1557 | || ehdr.e_ident[EI_CLASS] != ELFCLASS) |
---|
| 1558 | { |
---|
| 1559 | rtems_rtl_set_error (EINVAL, "invalid ELF file format"); |
---|
| 1560 | return false; |
---|
| 1561 | } |
---|
| 1562 | |
---|
| 1563 | if ((ehdr.e_ident[EI_VERSION] != EV_CURRENT) |
---|
| 1564 | || (ehdr.e_version != EV_CURRENT) |
---|
| 1565 | || (ehdr.e_ident[EI_DATA] != ELFDEFNNAME (MACHDEP_ENDIANNESS))) |
---|
| 1566 | { |
---|
| 1567 | rtems_rtl_set_error (EINVAL, "unsupported ELF file version"); |
---|
| 1568 | return false; |
---|
| 1569 | } |
---|
| 1570 | |
---|
| 1571 | if (!rtems_rtl_elf_machine_check (&ehdr)) |
---|
| 1572 | { |
---|
| 1573 | rtems_rtl_set_error (EINVAL, "unsupported machine type"); |
---|
| 1574 | return false; |
---|
| 1575 | } |
---|
| 1576 | |
---|
| 1577 | if (ehdr.e_type == ET_DYN) |
---|
| 1578 | { |
---|
| 1579 | rtems_rtl_set_error (EINVAL, "unsupported ELF file type"); |
---|
| 1580 | return false; |
---|
| 1581 | } |
---|
| 1582 | |
---|
| 1583 | if (ehdr.e_phentsize != 0) |
---|
| 1584 | { |
---|
| 1585 | rtems_rtl_set_error (EINVAL, "ELF file contains program headers"); |
---|
| 1586 | return false; |
---|
| 1587 | } |
---|
| 1588 | |
---|
| 1589 | if (ehdr.e_shentsize != sizeof (Elf_Shdr)) |
---|
| 1590 | { |
---|
| 1591 | rtems_rtl_set_error (EINVAL, "invalid ELF section header size"); |
---|
| 1592 | return false; |
---|
| 1593 | } |
---|
| 1594 | |
---|
[b36c5209] | 1595 | /* |
---|
| 1596 | * Set the format's architecture's maximum tramp size. |
---|
| 1597 | */ |
---|
| 1598 | obj->tramp_size = rtems_rtl_elf_relocate_tramp_max_size (); |
---|
| 1599 | |
---|
[ae5fe7e6] | 1600 | /* |
---|
| 1601 | * Parse the section information first so we have the memory map of the object |
---|
| 1602 | * file and the memory allocated. Any further allocations we make to complete |
---|
| 1603 | * the load will not fragment the memory. |
---|
| 1604 | */ |
---|
| 1605 | if (!rtems_rtl_elf_parse_sections (obj, fd, &ehdr)) |
---|
| 1606 | return false; |
---|
| 1607 | |
---|
[803eac9] | 1608 | /* |
---|
[b36c5209] | 1609 | * Set the entry point if there is one. |
---|
| 1610 | */ |
---|
| 1611 | obj->entry = (void*)(uintptr_t) ehdr.e_entry; |
---|
| 1612 | |
---|
| 1613 | /* |
---|
| 1614 | * Load the symbol table. |
---|
| 1615 | * |
---|
| 1616 | * 1. See if there are any common variables and if there are add a |
---|
| 1617 | * common section. |
---|
| 1618 | * 2. Add up the common. |
---|
| 1619 | * 3. |
---|
[803eac9] | 1620 | */ |
---|
| 1621 | if (!rtems_rtl_obj_load_symbols (obj, fd, rtems_rtl_elf_common, &common)) |
---|
| 1622 | return false; |
---|
| 1623 | if (!rtems_rtl_elf_add_common (obj, common.size, common.alignment)) |
---|
| 1624 | return false; |
---|
[b36c5209] | 1625 | if (!rtems_rtl_obj_load_symbols (obj, fd, rtems_rtl_elf_symbols_load, &ehdr)) |
---|
| 1626 | return false; |
---|
[803eac9] | 1627 | |
---|
| 1628 | /* |
---|
[b36c5209] | 1629 | * Parse the relocation records. It lets us know how many dependents |
---|
| 1630 | * and fixup trampolines there are. |
---|
[803eac9] | 1631 | */ |
---|
[b36c5209] | 1632 | if (!rtems_rtl_obj_relocate (obj, fd, rtems_rtl_elf_relocs_parser, &relocs)) |
---|
| 1633 | return false; |
---|
[ae5fe7e6] | 1634 | |
---|
[22afb034] | 1635 | /* |
---|
| 1636 | * Lock the allocator so the section memory and the trampoline memory are as |
---|
| 1637 | * clock as possible. |
---|
| 1638 | */ |
---|
| 1639 | rtems_rtl_alloc_lock (); |
---|
| 1640 | |
---|
[6c9f017] | 1641 | /* |
---|
| 1642 | * Allocate the sections. |
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| 1643 | */ |
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| 1644 | if (!rtems_rtl_obj_alloc_sections (obj, fd, rtems_rtl_elf_arch_alloc, &ehdr)) |
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| 1645 | return false; |
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| 1646 | |
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[b36c5209] | 1647 | if (!rtems_rtl_obj_load_symbols (obj, fd, rtems_rtl_elf_symbols_locate, &ehdr)) |
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[03139d5b] | 1648 | return false; |
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| 1649 | |
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| 1650 | if (!rtems_rtl_elf_dependents (obj, &relocs)) |
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| 1651 | return false; |
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| 1652 | |
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[d8c70ba6] | 1653 | if (!rtems_rtl_elf_alloc_trampoline (obj, relocs.unresolved)) |
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| 1654 | return false; |
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| 1655 | |
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[22afb034] | 1656 | /* |
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| 1657 | * Unlock the allocator. |
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| 1658 | */ |
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| 1659 | rtems_rtl_alloc_unlock (); |
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| 1660 | |
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[b36c5209] | 1661 | /* |
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| 1662 | * Load the sections and symbols and then relocation to the base address. |
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| 1663 | */ |
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| 1664 | if (!rtems_rtl_obj_load_sections (obj, fd, rtems_rtl_elf_loader, &ehdr)) |
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[ae5fe7e6] | 1665 | return false; |
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| 1666 | |
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[b36c5209] | 1667 | /* |
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| 1668 | * Fix up the relocations. |
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| 1669 | */ |
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[03139d5b] | 1670 | if (!rtems_rtl_obj_relocate (obj, fd, rtems_rtl_elf_relocs_locator, &ehdr)) |
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[ae5fe7e6] | 1671 | return false; |
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| 1672 | |
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[a2e1e30d] | 1673 | rtems_rtl_symbol_obj_erase_local (obj); |
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| 1674 | |
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[c6eead1] | 1675 | if (!rtems_rtl_elf_load_linkmap (obj)) |
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| 1676 | { |
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| 1677 | return false; |
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| 1678 | } |
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| 1679 | |
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| 1680 | if (!rtems_rtl_elf_unwind_register (obj)) |
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[ae5fe7e6] | 1681 | { |
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| 1682 | return false; |
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| 1683 | } |
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| 1684 | |
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| 1685 | return true; |
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| 1686 | } |
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| 1687 | |
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[c6eead1] | 1688 | bool |
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[f59d435d] | 1689 | rtems_rtl_elf_file_unload (rtems_rtl_obj* obj) |
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[c6eead1] | 1690 | { |
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[6c9f017] | 1691 | rtems_rtl_elf_arch_free (obj); |
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[c6eead1] | 1692 | rtems_rtl_elf_unwind_deregister (obj); |
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| 1693 | return true; |
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| 1694 | } |
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| 1695 | |
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[f59d435d] | 1696 | rtems_rtl_loader_format* |
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[ae5fe7e6] | 1697 | rtems_rtl_elf_file_sig (void) |
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| 1698 | { |
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| 1699 | return &elf_sig; |
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| 1700 | } |
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