1 #ifndef ELFCOPY_H 2 #define ELFCOPY_H 3 4 #include <libelf.h> 5 #include <libebl.h> 6 #include <elf.h> 7 #include <gelf.h> 8 9 typedef struct shdr_info_t { 10 /* data from original file: */ 11 Elf_Scn *scn; /* original section */ 12 /* Original-section header. */ 13 GElf_Shdr old_shdr; 14 /* Starts out as the original header, but we modify this variable when we 15 compose the new section information. */ 16 GElf_Shdr shdr; 17 /* This oddly-named flag causes adjust_elf() to look at the size of the 18 relocation sections before the modification, as opposed to the new 19 size, in order to determine the number of relocation entries. */ 20 bool use_old_shdr_for_relocation_calculations; 21 const char *name; /* name of the original section */ 22 /* If we do not want to modify a section's data, we set this field to NULL. 23 This will cause clone_elf() to extract the original section's data and 24 copy it over to the new section. If, on the other hand, we do want to 25 change the data, we call elf_newdata() by ourselves and set *data to 26 the return value. 27 */ 28 Elf_Data *data; 29 Elf_Data *newdata; 30 31 /* data for new file */ 32 33 /* Index in new file. Before we assign numbers to the sections in the 34 new file, the idx field has the following meaning: 35 0 -- will strip 36 1 -- present but not yet investigated 37 2 -- handled (stripped or decided not to stip). 38 */ 39 Elf32_Word idx; 40 Elf_Scn *newscn; /* new section handle */ 41 struct Ebl_Strent *se; /* contribution to shstr section */ 42 /* The following three variables are for symbol-table-sections (SHT_DYNSYM 43 and SHT_SYMTAB). 44 45 newsymidx: contains a mapping between the indices of old symbols and new 46 symbols. If a symbol table has changed, then newsymidx != 47 NULL; otherwise, it is NULL. Thus newsymidx can be used also 48 as a flag. 49 50 dynsymst: handle to the new symbol-strings section. 51 */ 52 Elf32_Word *newsymidx; 53 struct Ebl_Strtab *dynsymst; 54 /* The following variable is used by SHT_DYNSYM, SHT_SYMTAB and SHT_DYNAMIC 55 sections only. For the symbol tables, this is a parallel array to the 56 symbol table that stores the symbol name's index into the symbol-strings 57 table. 58 59 For the dynamic section, this is an array parallel to the array of 60 structures that the dynamic section is; for each structure that 61 represents a string field, the element at the same index into symse 62 contains the offset of that string into the new dynamic-symbol table. 63 */ 64 struct Ebl_Strent **symse; 65 } shdr_info_t; 66 67 /* 68 Symbol_filter: 69 On input: symbol_filter[i] indicates whether to keep a symbol (1) or to 70 remove it from the symbol table. 71 On output: symbol_filter[i] indicates whether a symbol was removed (0) or 72 kept (1) in the symbol table. 73 */ 74 75 void adjust_elf(Elf *elf, const char *elf_name, 76 Elf *newelf, const char *newelf_name, 77 Ebl *ebl, 78 GElf_Ehdr *ehdr, /* store ELF header of original library */ 79 bool *sym_filter, int num_symbols, 80 struct shdr_info_t *shdr_info, int shdr_info_len, 81 GElf_Phdr *phdr_info, 82 size_t highest_scn_num, 83 size_t shnum, 84 size_t shstrndx, 85 struct Ebl_Strtab *shst, 86 bool sections_dropped_or_rearranged, 87 int dynamic_idx, /* index in shdr_info[] of .dynamic section */ 88 int dynsym_idx, /* index in shdr_info[] of dynamic symbol table */ 89 int shady, 90 Elf_Data **shstrtab_data, 91 bool adjust_section_offsets, 92 bool rebuild_shstrtab); 93 94 #endif/*ELFCOPY_H*/ 95
