output/outelf.h

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 1996-2019 The NASM Authors - All Rights Reserved
   4  *   See the file AUTHORS included with the NASM distribution for
   5  *   the specific copyright holders.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following
   9  *   conditions are met:
  10  *
  11  *   * Redistributions of source code must retain the above copyright
  12  *     notice, this list of conditions and the following disclaimer.
  13  *   * Redistributions in binary form must reproduce the above
  14  *     copyright notice, this list of conditions and the following
  15  *     disclaimer in the documentation and/or other materials provided
  16  *     with the distribution.
  17  *
  18  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  19  *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  20  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  21  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  22  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  23  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26  *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  29  *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  30  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * ----------------------------------------------------------------------- */
  33
  34 /*
  35  * Internal definitions common to outelf32 and outelf64
  36  */
  37 #ifndef OUTPUT_OUTELF_H
  38 #define OUTPUT_OUTELF_H
  39
  40 #include "elf.h"
  41 #include "rbtree.h"
  42 #include "saa.h"
  43
  44 #define GLOBAL_TEMP_BASE  0x40000000 /* bigger than any sane symbol index */
  45
  46 /* alignment of sections in file */
  47 #define SEC_FILEALIGN 16
  48
  49 /* this stuff is needed for the dwarf/stabs debugging format */
  50 #define TY_DEBUGSYMLIN 0x40     /* internal call to debug_out */
  51
  52 /*
  53  * Debugging ELF sections (section indicies starting with sec_debug)
  54  */
  55
  56 /* stabs */
  57 #define sec_stab                (sec_debug + 0)
  58 #define sec_stabstr             (sec_debug + 1)
  59 #define sec_rel_stab            (sec_debug + 2)
  60
  61 /* stabs symbol table format */
  62 struct stabentry {
  63     uint32_t    n_strx;
  64     uint8_t     n_type;
  65     uint8_t     n_other;
  66     uint16_t    n_desc;
  67     uint32_t    n_value;
  68 };
  69
  70 /* dwarf */
  71 #define sec_debug_aranges       (sec_debug + 0)
  72 #define sec_rela_debug_aranges  (sec_debug + 1)
  73 #define sec_debug_pubnames      (sec_debug + 2)
  74 #define sec_debug_info          (sec_debug + 3)
  75 #define sec_rela_debug_info     (sec_debug + 4)
  76 #define sec_debug_abbrev        (sec_debug + 5)
  77 #define sec_debug_line          (sec_debug + 6)
  78 #define sec_rela_debug_line     (sec_debug + 7)
  79 #define sec_debug_frame         (sec_debug + 8)
  80 #define sec_debug_loc           (sec_debug + 9)
  81
  82 extern uint8_t elf_osabi;
  83 extern uint8_t elf_abiver;
  84
  85 #define WRITE_STAB(p,n_strx,n_type,n_other,n_desc,n_value)  \
  86     do {                                                    \
  87         WRITELONG(p, n_strx);                               \
  88         WRITECHAR(p, n_type);                               \
  89         WRITECHAR(p, n_other);                              \
  90         WRITESHORT(p, n_desc);                              \
  91         WRITELONG(p, n_value);                              \
  92     } while (0)
  93
  94 struct elf_reloc {
  95     struct elf_reloc    *next;
  96     int64_t             address;        /* relative to _start_ of section */
  97     int64_t             symbol;         /* symbol index */
  98     int64_t             offset;         /* symbol addend */
  99     int                 type;           /* type of relocation */
 100 };
 101
 102 struct elf_symbol {
 103     struct rbtree       symv;           /* symbol value and symbol rbtree */
 104     int32_t             strpos;         /* string table position of name */
 105     int32_t             section;        /* section ID of the symbol */
 106     int                 type;           /* symbol type */
 107     int                 other;          /* symbol visibility */
 108     int32_t             size;           /* size of symbol */
 109     int32_t             globnum;        /* symbol table offset if global */
 110     struct elf_symbol   *nextfwd;       /* list of unresolved-size symbols */
 111     char                *name;          /* used temporarily if in above list */
 112 };
 113
 114 struct elf_section {
 115     struct SAA          *data;
 116     uint64_t            len;
 117     uint64_t            size;
 118     uint64_t            nrelocs;
 119     int32_t             index;          /* NASM index or NO_SEG if internal */
 120     int                 shndx;          /* ELF index */
 121     int                 type;           /* SHT_* */
 122     uint64_t            align;          /* alignment: power of two */
 123     uint64_t            flags;          /* section flags */
 124     int64_t             pass_last_seen;
 125     uint64_t            entsize;        /* entry size */
 126     char                *name;
 127     struct SAA          *rel;
 128     struct elf_reloc    *head;
 129     struct elf_reloc    **tail;
 130     struct rbtree       *gsyms;         /* global symbols in section */
 131 };
 132
 133 #endif /* OUTPUT_OUTELF_H */