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#ifndef LTRACE_ELF_H
#define LTRACE_ELF_H
#include <gelf.h>
#include <stdlib.h>
#include "sysdep.h"
struct Process;
struct library;
struct library_symbol;
/* XXX Ok, the original idea was to separate the low-level ELF data
* from the abstract "struct library" object, but we use some of the
* following extensively in the back end. Not all though. So what we
* use should be move to struct library, and the rest of this
* structure maybe could be safely hidden in .c. How to integrate the
* arch-specific bits into struct library is unclear as of now. */
struct ltelf {
int fd;
Elf *elf;
GElf_Ehdr ehdr;
Elf_Data *dynsym;
size_t dynsym_count;
const char *dynstr;
GElf_Addr plt_addr;
GElf_Word plt_flags;
size_t plt_size;
Elf_Data *relplt;
Elf_Data *plt_data;
size_t relplt_count;
Elf_Data *symtab;
const char *strtab;
const char *soname;
size_t symtab_count;
Elf_Data *opd;
GElf_Addr *opd_addr;
size_t opd_size;
GElf_Addr dyn_addr;
size_t dyn_sz;
size_t relplt_size;
GElf_Addr bias;
GElf_Addr entry_addr;
GElf_Addr base_addr;
struct arch_ltelf_data arch;
};
int open_elf(struct ltelf *lte, const char *filename);
/* XXX is it possible to put breakpoints in VDSO and VSYSCALL
* pseudo-libraries? For now we assume that all libraries can be
* opened via a filesystem. BASE is ignored for ET_EXEC files. */
int ltelf_read_library(struct library *lib, struct Process *proc,
const char *filename, GElf_Addr bias);
/* Create a library object representing the main binary. The entry
* point address is stored to *ENTRYP. */
struct library *ltelf_read_main_binary(struct Process *proc, const char *path);
GElf_Addr arch_plt_sym_val(struct ltelf *, size_t, GElf_Rela *);
Elf_Data *elf_loaddata(Elf_Scn *scn, GElf_Shdr *shdr);
int elf_get_section_covering(struct ltelf *lte, GElf_Addr addr,
Elf_Scn **tgt_sec, GElf_Shdr *tgt_shdr);
int elf_get_section_type(struct ltelf *lte, GElf_Word type,
Elf_Scn **tgt_sec, GElf_Shdr *tgt_shdr);
int elf_get_section_named(struct ltelf *lte, const char *name,
Elf_Scn **tgt_sec, GElf_Shdr *tgt_shdr);
/* Read, respectively, 2, 4, or 8 bytes from Elf data at given OFFSET,
* and store it in *RETP. Returns 0 on success or a negative value if
* there's not enough data. */
int elf_read_u16(Elf_Data *data, GElf_Xword offset, uint16_t *retp);
int elf_read_u32(Elf_Data *data, GElf_Xword offset, uint32_t *retp);
int elf_read_u64(Elf_Data *data, GElf_Xword offset, uint64_t *retp);
int default_elf_add_plt_entry(struct Process *proc, struct ltelf *lte,
const char *a_name, GElf_Rela *rela, size_t ndx,
struct library_symbol **ret);
#if __WORDSIZE == 32
#define PRI_ELF_ADDR PRIx32
#define GELF_ADDR_CAST(x) (void *)(uint32_t)(x)
#else
#define PRI_ELF_ADDR PRIx64
#define GELF_ADDR_CAST(x) (void *)(x)
#endif
#endif
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