ltrace-elf.h revision 3a01cd7a2fcf200cedd0770e137a28764f679c3c
1#ifndef LTRACE_ELF_H 2#define LTRACE_ELF_H 3 4#include <gelf.h> 5#include <stdlib.h> 6#include "sysdep.h" 7 8struct Process; 9struct library; 10struct library_symbol; 11 12/* XXX Ok, the original idea was to separate the low-level ELF data 13 * from the abstract "struct library" object, but we use some of the 14 * following extensively in the back end. Not all though. So what we 15 * use should be move to struct library, and the rest of this 16 * structure maybe could be safely hidden in .c. How to integrate the 17 * arch-specific bits into struct library is unclear as of now. */ 18struct ltelf { 19 int fd; 20 Elf *elf; 21 GElf_Ehdr ehdr; 22 Elf_Data *dynsym; 23 size_t dynsym_count; 24 const char *dynstr; 25 GElf_Addr plt_addr; 26 GElf_Word plt_flags; 27 size_t plt_size; 28 Elf_Data *relplt; 29 Elf_Data *plt_data; 30 size_t relplt_count; 31 Elf_Data *symtab; 32 const char *strtab; 33 const char *soname; 34 size_t symtab_count; 35 Elf_Data *opd; 36 GElf_Addr *opd_addr; 37 size_t opd_size; 38 GElf_Addr dyn_addr; 39 size_t dyn_sz; 40 size_t relplt_size; 41 GElf_Addr bias; 42 GElf_Addr entry_addr; 43 GElf_Addr base_addr; 44 struct arch_ltelf_data arch; 45}; 46 47int open_elf(struct ltelf *lte, const char *filename); 48 49/* XXX is it possible to put breakpoints in VDSO and VSYSCALL 50 * pseudo-libraries? For now we assume that all libraries can be 51 * opened via a filesystem. BASE is ignored for ET_EXEC files. */ 52int ltelf_read_library(struct library *lib, struct Process *proc, 53 const char *filename, GElf_Addr bias); 54 55/* Create a library object representing the main binary. The entry 56 * point address is stored to *ENTRYP. */ 57struct library *ltelf_read_main_binary(struct Process *proc, const char *path); 58 59GElf_Addr arch_plt_sym_val(struct ltelf *, size_t, GElf_Rela *); 60 61Elf_Data *elf_loaddata(Elf_Scn *scn, GElf_Shdr *shdr); 62int elf_get_section_covering(struct ltelf *lte, GElf_Addr addr, 63 Elf_Scn **tgt_sec, GElf_Shdr *tgt_shdr); 64int elf_get_section_type(struct ltelf *lte, GElf_Word type, 65 Elf_Scn **tgt_sec, GElf_Shdr *tgt_shdr); 66 67/* Read, respectively, 2, 4, or 8 bytes from Elf data at given OFFSET, 68 * and store it in *RETP. Returns 0 on success or a negative value if 69 * there's not enough data. */ 70int elf_read_u16(Elf_Data *data, GElf_Xword offset, uint16_t *retp); 71int elf_read_u32(Elf_Data *data, GElf_Xword offset, uint32_t *retp); 72int elf_read_u64(Elf_Data *data, GElf_Xword offset, uint64_t *retp); 73 74int default_elf_add_plt_entry(struct Process *proc, struct ltelf *lte, 75 const char *a_name, GElf_Rela *rela, size_t ndx, 76 struct library_symbol **ret); 77 78#if __WORDSIZE == 32 79#define PRI_ELF_ADDR PRIx32 80#define GELF_ADDR_CAST(x) (void *)(uint32_t)(x) 81#else 82#define PRI_ELF_ADDR PRIx64 83#define GELF_ADDR_CAST(x) (void *)(x) 84#endif 85 86#endif 87