output/outelf.h

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 1996-2009 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 "output/elf.h"
  41 #include "rbtree.h"
  42 #include "saa.h"
  43
  44 /* symbol binding */
  45 #define SYM_GLOBAL      ELF32_ST_MKBIND(STB_GLOBAL)
  46 #define SYM_LOCAL       ELF32_ST_MKBIND(STB_LOCAL)
  47
  48 #define GLOBAL_TEMP_BASE  0x40000000 /* bigger than any sane symbol index */
  49
  50 /* alignment of sections in file */
  51 #define SEC_FILEALIGN 16
  52
  53 /* this stuff is needed for the stabs debugging format */
  54 #define TY_STABSSYMLIN 0x40     /* ouch */
  55
  56 /* this stuff is needed for the dwarf debugging format */
  57 #define TY_DEBUGSYMLIN 0x40     /* internal call to debug_out */
  58
  59 /* Known sections with nonstandard defaults */
  60 struct elf_known_section {
  61     const char *name;   /* Name of section */
  62     int type;           /* Section type (SHT_) */
  63     uint32_t flags;     /* Section flags (SHF_) */
  64     uint32_t align;     /* Section alignment */
  65 };
  66 extern const struct elf_known_section elf_known_sections[];
  67
  68 /*
  69  * Special ELF sections (after the real sections but before debugging ones)
  70  */
  71 #define sec_shstrtab            (nsects + 1)
  72 #define sec_symtab              (nsects + 2)
  73 #define sec_strtab              (nsects + 3)
  74 #define sec_numspecial          3
  75
  76 /*
  77  * Debugging ELF sections (last in the file)
  78  */
  79
  80 /* stabs */
  81 #define sec_stab                (nsections-3)
  82 #define sec_stabstr             (nsections-2)
  83 #define sec_rel_stab            (nsections-1)
  84
  85 /* stabs symbol table format */
  86 struct stabentry {
  87     uint32_t    n_strx;
  88     uint8_t     n_type;
  89     uint8_t     n_other;
  90     uint16_t    n_desc;
  91     uint32_t    n_value;
  92 };
  93
  94 /* dwarf */
  95 #define sec_debug_aranges       (nsections-10)
  96 #define sec_rela_debug_aranges  (nsections-9)
  97 #define sec_debug_pubnames      (nsections-8)
  98 #define sec_debug_info          (nsections-7)
  99 #define sec_rela_debug_info     (nsections-6)
 100 #define sec_debug_abbrev        (nsections-5)
 101 #define sec_debug_line          (nsections-4)
 102 #define sec_rela_debug_line     (nsections-3)
 103 #define sec_debug_frame         (nsections-2)
 104 #define sec_debug_loc           (nsections-1)
 105
 106 extern uint8_t elf_osabi;
 107 extern uint8_t elf_abiver;
 108
 109 int elf_directive(enum directives directive, char *value, int pass);
 110 void elf_section_attrib(char *name, char *attr, int pass,
 111                         uint32_t *flags_and, uint32_t *flags_or,
 112                         uint64_t *align, int *type);
 113
 114 #define WRITE_STAB(p,n_strx,n_type,n_other,n_desc,n_value)  \
 115     do {                                                    \
 116         WRITELONG(p, n_strx);                               \
 117         WRITECHAR(p, n_type);                               \
 118         WRITECHAR(p, n_other);                              \
 119         WRITESHORT(p, n_desc);                              \
 120         WRITELONG(p, n_value);                              \
 121     } while (0)
 122
 123 struct elf_reloc {
 124     struct elf_reloc    *next;
 125     int64_t             address;        /* relative to _start_ of section */
 126     int64_t             symbol;         /* symbol index */
 127     int64_t             offset;         /* symbol addend */
 128     int                 type;           /* type of relocation */
 129 };
 130
 131 struct elf_symbol {
 132     struct rbtree       symv;           /* symbol value and symbol rbtree */
 133     int32_t             strpos;         /* string table position of name */
 134     int32_t             section;        /* section ID of the symbol */
 135     int                 type;           /* symbol type */
 136     int                 other;          /* symbol visibility */
 137     int32_t             size;           /* size of symbol */
 138     int32_t             globnum;        /* symbol table offset if global */
 139     struct elf_symbol   *nextfwd;       /* list of unresolved-size symbols */
 140     char                *name;          /* used temporarily if in above list */
 141 };
 142
 143 struct elf_section {
 144     struct SAA          *data;
 145     uint64_t            len;
 146     uint64_t            size;
 147     uint64_t            nrelocs;
 148     int32_t             index;
 149     int                 type;           /* SHT_PROGBITS or SHT_NOBITS */
 150     uint64_t            align;          /* alignment: power of two */
 151     uint64_t            flags;          /* section flags */
 152     char                *name;
 153     struct SAA          *rel;
 154     uint64_t             rellen;
 155     struct elf_reloc    *head;
 156     struct elf_reloc    **tail;
 157     struct rbtree       *gsyms;         /* global symbols in section */
 158 };
 159
 160 #endif /* OUTPUT_OUTELF_H */