dwarf-synthesis/DwarfSynth/c_bindings/dwarf_write.h
Théophile Bastian 8fa2bc5952 ml_dwarf_write: write to a separate file
Don't try to write into the ELF file directly, use objcopy.

Updated README
2019-03-18 14:20:53 +01:00

59 lines
1.3 KiB
C

/** dwarf_write -- set of functions to add a given DWARF table to an ELF file
*
* Mostly based on work by emersion on Dareog
* <https://github.com/emersion/dareog>
*/
#pragma once
#define _XOPEN_SOURCE 700
#include "../../libdwarfw/include/dwarfw.h"
#include <libdwarf/dwarf.h>
#include <gelf.h>
#include <string.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <libelf.h>
#include <limits.h>
#include <stddef.h>
typedef uint8_t reg_t;
typedef long long int offset_t;
typedef uintptr_t addr_t;
// ====== Registers definition for x86_64 ======
#define DW_REG_RA ((reg_t)16)
#define DW_REG_RBP ((reg_t)6)
#define DW_REG_RSP ((reg_t)7)
#define DW_REG_INV ((reg_t)0xff)
#define DW_MAX_REG ((reg_t)31)
/// Very basic DWARF structure representing only CFA -- RA is at fixed offset
struct pre_dwarf_entry {
addr_t location;
reg_t cfa_offset_reg;
offset_t cfa_offset;
};
struct pre_dwarf_fde {
size_t num;
struct pre_dwarf_entry* entries;
addr_t initial_location, end_location;
};
struct pre_dwarf {
size_t num_fde;
struct pre_dwarf_fde* fdes;
};
/// Writes the provided `pre_dwarf` as DWARF in the file `eh_path`, for the ELF file at `obj_path`
int write_dwarf(char* obj_path, char* eh_path, struct pre_dwarf* pre_dwarf);