Théophile Bastian
8fa2bc5952
Don't try to write into the ELF file directly, use objcopy. Updated README
60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
/** dwarf_write -- set of functions to add a given DWARF table to an ELF file
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*
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* Mostly based on work by emersion on Dareog
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* <https://github.com/emersion/dareog>
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*/
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#pragma once
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#define _XOPEN_SOURCE 700
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#include "../../libdwarfw/include/dwarfw.h"
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#include <libdwarf/dwarf.h>
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#include <gelf.h>
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#include <string.h>
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#include <stdint.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <libelf.h>
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#include <limits.h>
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#include <stddef.h>
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typedef uint8_t reg_t;
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typedef long long int offset_t;
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typedef uintptr_t addr_t;
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// ====== Registers definition for x86_64 ======
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#define DW_REG_RA ((reg_t)16)
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#define DW_REG_RBP ((reg_t)6)
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#define DW_REG_RSP ((reg_t)7)
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#define DW_REG_INV ((reg_t)0xff)
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#define DW_MAX_REG ((reg_t)31)
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/// Very basic DWARF structure representing only CFA -- RA is at fixed offset
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struct pre_dwarf_entry {
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addr_t location;
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reg_t cfa_offset_reg;
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offset_t cfa_offset;
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};
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struct pre_dwarf_fde {
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size_t num;
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struct pre_dwarf_entry* entries;
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addr_t initial_location, end_location;
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};
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struct pre_dwarf {
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size_t num_fde;
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struct pre_dwarf_fde* fdes;
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};
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/// Writes the provided `pre_dwarf` as DWARF in the file `eh_path`, for the ELF file at `obj_path`
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int write_dwarf(char* obj_path, char* eh_path, struct pre_dwarf* pre_dwarf);
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