output/outelf.h

/* ----------------------------------------------------------------------- *
 *
 *   Copyright 1996-2019 The NASM Authors - All Rights Reserved
 *   See the file AUTHORS included with the NASM distribution for
 *   the specific copyright holders.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following
 *   conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
 *
 *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * ----------------------------------------------------------------------- */

/*
 * Internal definitions common to outelf32 and outelf64
 */
#ifndef OUTPUT_OUTELF_H
#define OUTPUT_OUTELF_H

#include "elf.h"
#include "rbtree.h"
#include "saa.h"

#define GLOBAL_TEMP_BASE  0x40000000 /* bigger than any sane symbol index */

/* alignment of sections in file */
#define SEC_FILEALIGN 16

/* this stuff is needed for the dwarf/stabs debugging format */
#define TY_DEBUGSYMLIN 0x40     /* internal call to debug_out */

/*
 * Debugging ELF sections (section indicies starting with sec_debug)
 */

/* stabs */
#define sec_stab                (sec_debug + 0)
#define sec_stabstr             (sec_debug + 1)
#define sec_rel_stab            (sec_debug + 2)

/* stabs symbol table format */
struct stabentry {
    uint32_t    n_strx;
    uint8_t     n_type;
    uint8_t     n_other;
    uint16_t    n_desc;
    uint32_t    n_value;
};

/* dwarf */
#define sec_debug_aranges       (sec_debug + 0)
#define sec_rela_debug_aranges  (sec_debug + 1)
#define sec_debug_pubnames      (sec_debug + 2)
#define sec_debug_info          (sec_debug + 3)
#define sec_rela_debug_info     (sec_debug + 4)
#define sec_debug_abbrev        (sec_debug + 5)
#define sec_debug_line          (sec_debug + 6)
#define sec_rela_debug_line     (sec_debug + 7)
#define sec_debug_frame         (sec_debug + 8)
#define sec_debug_loc           (sec_debug + 9)

extern uint8_t elf_osabi;
extern uint8_t elf_abiver;

#define WRITE_STAB(p,n_strx,n_type,n_other,n_desc,n_value)  \
    do {                                                    \
        WRITELONG(p, n_strx);                               \
        WRITECHAR(p, n_type);                               \
        WRITECHAR(p, n_other);                              \
        WRITESHORT(p, n_desc);                              \
        WRITELONG(p, n_value);                              \
    } while (0)

struct elf_reloc {
    struct elf_reloc    *next;
    int64_t             address;        /* relative to _start_ of section */
    int64_t             symbol;         /* symbol index */
    int64_t             offset;         /* symbol addend */
    int                 type;           /* type of relocation */
};

struct elf_symbol {
    struct rbtree       symv;           /* symbol value and symbol rbtree */
    int32_t             strpos;         /* string table position of name */
    int32_t             section;        /* section ID of the symbol */
    int                 type;           /* symbol type */
    int                 other;          /* symbol visibility */
    int32_t             size;           /* size of symbol */
    int32_t             globnum;        /* symbol table offset if global */
    struct elf_symbol   *nextfwd;       /* list of unresolved-size symbols */
    char                *name;          /* used temporarily if in above list */
};

struct elf_section {
    struct SAA          *data;
    uint64_t            len;
    uint64_t            size;
    uint64_t            nrelocs;
    int32_t             index;		/* NASM index or NO_SEG if internal */
    int			shndx;          /* ELF index */
    int                 type;           /* SHT_* */
    uint64_t            align;          /* alignment: power of two */
    uint64_t            flags;          /* section flags */
    int64_t		pass_last_seen;
    uint64_t		entsize;        /* entry size */
    char                *name;
    struct SAA          *rel;
    struct elf_reloc    *head;
    struct elf_reloc    **tail;
    struct rbtree       *gsyms;         /* global symbols in section */
};

#endif /* OUTPUT_OUTELF_H */