sysdeps/mips/elf/ldsodefs.h

   1 /* Run-time dynamic linker data structures for loaded ELF shared objects.
   2    Copyright (C) 2000, 2002, 2003 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _MIPS_LDSODEFS_H
  21 #define _MIPS_LDSODEFS_H
  22
  23 /* The MIPS ABI specifies that the dynamic section has to be read-only.  */
  24
  25 #define DL_RO_DYN_SECTION 1
  26
  27 #include_next <ldsodefs.h>
  28
  29 /* The 64-bit MIPS ELF ABI uses an unusual reloc format.  Each
  30    relocation entry specifies up to three actual relocations, all at
  31    the same address.  The first relocation which required a symbol
  32    uses the symbol in the r_sym field.  The second relocation which
  33    requires a symbol uses the symbol in the r_ssym field.  If all
  34    three relocations require a symbol, the third one uses a zero
  35    value.
  36
  37    We define these structures in internal headers because we're not
  38    sure we want to make them part of the ABI yet.  Eventually, some of
  39    this may move into elf/elf.h.  */
  40
  41 /* An entry in a 64 bit SHT_REL section.  */
  42
  43 typedef struct
  44 {
  45   Elf32_Word    r_sym;          /* Symbol index */
  46   unsigned char r_ssym;         /* Special symbol for 2nd relocation */
  47   unsigned char r_type3;        /* 3rd relocation type */
  48   unsigned char r_type2;        /* 2nd relocation type */
  49   unsigned char r_type1;        /* 1st relocation type */
  50 } _Elf64_Mips_R_Info;
  51
  52 typedef union
  53 {
  54   Elf64_Xword   r_info_number;
  55   _Elf64_Mips_R_Info r_info_fields;
  56 } _Elf64_Mips_R_Info_union;
  57
  58 typedef struct
  59 {
  60   Elf64_Addr    r_offset;               /* Address */
  61   _Elf64_Mips_R_Info_union r_info;      /* Relocation type and symbol index */
  62 } Elf64_Mips_Rel;
  63
  64 typedef struct
  65 {
  66   Elf64_Addr    r_offset;               /* Address */
  67   _Elf64_Mips_R_Info_union r_info;      /* Relocation type and symbol index */
  68   Elf64_Sxword  r_addend;               /* Addend */
  69 } Elf64_Mips_Rela;
  70
  71 #define ELF64_MIPS_R_SYM(i) \
  72   ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym)
  73 #define ELF64_MIPS_R_TYPE(i) \
  74   (((_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1 \
  75    | ((Elf32_Word)(__extension__ (_Elf64_Mips_R_Info_union)(i) \
  76                    ).r_info_fields.r_type2 << 8) \
  77    | ((Elf32_Word)(__extension__ (_Elf64_Mips_R_Info_union)(i) \
  78                    ).r_info_fields.r_type3 << 16) \
  79    | ((Elf32_Word)(__extension__ (_Elf64_Mips_R_Info_union)(i) \
  80                    ).r_info_fields.r_ssym << 24))
  81 #define ELF64_MIPS_R_INFO(sym, type) \
  82   (__extension__ (_Elf64_Mips_R_Info_union) \
  83    (__extension__ (_Elf64_Mips_R_Info) \
  84    { (sym), ELF64_MIPS_R_SSYM (type), \
  85        ELF64_MIPS_R_TYPE3 (type), \
  86        ELF64_MIPS_R_TYPE2 (type), \
  87        ELF64_MIPS_R_TYPE1 (type) \
  88    }).r_info_number)
  89 /* These macros decompose the value returned by ELF64_MIPS_R_TYPE, and
  90    compose it back into a value that it can be used as an argument to
  91    ELF64_MIPS_R_INFO.  */
  92 #define ELF64_MIPS_R_SSYM(i) (((i) >> 24) & 0xff)
  93 #define ELF64_MIPS_R_TYPE3(i) (((i) >> 16) & 0xff)
  94 #define ELF64_MIPS_R_TYPE2(i) (((i) >> 8) & 0xff)
  95 #define ELF64_MIPS_R_TYPE1(i) ((i) & 0xff)
  96 #define ELF64_MIPS_R_TYPEENC(type1, type2, type3, ssym) \
  97   ((type1) \
  98    | ((Elf32_Word)(type2) << 8) \
  99    | ((Elf32_Word)(type3) << 16) \
 100    | ((Elf32_Word)(ssym) << 24))
 101
 102 #undef ELF64_R_SYM
 103 #define ELF64_R_SYM(i) ELF64_MIPS_R_SYM (i)
 104 #undef ELF64_R_TYPE
 105 #define ELF64_R_TYPE(i) ELF64_MIPS_R_TYPE (i)
 106 #undef ELF64_R_INFO
 107 #define ELF64_R_INFO(sym, type) ELF64_MIPS_R_INFO ((sym), (type))
 108
 109 #endif