bfd/elf32-hppa.h

   1 /* ELF32/HPPA support
   2
   3    This file contains ELF32/HPPA relocation support as specified
   4    in the Stratus FTX/Golf Object File Format (SED-1762) dated
   5    November 19, 1992.
   6
   7    Copyright (C) 1990, 91, 92, 93, 94 Free Software Foundation, Inc.
   8
   9    Written by:
  10
  11    Center for Software Science
  12    Department of Computer Science
  13    University of Utah
  14
  15    This file is part of BFD, the Binary File Descriptor library.
  16
  17    This program is free software; you can redistribute it and/or modify
  18    it under the terms of the GNU General Public License as published by
  19    the Free Software Foundation; either version 2 of the License, or
  20    (at your option) any later version.
  21
  22    This program is distributed in the hope that it will be useful,
  23    but WITHOUT ANY WARRANTY; without even the implied warranty of
  24    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25    GNU General Public License for more details.
  26
  27    You should have received a copy of the GNU General Public License
  28    along with this program; if not, write to the Free Software
  29    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  30
  31 #ifndef _ELF32_HPPA_H
  32 #define _ELF32_HPPA_H
  33
  34 #include "libelf.h"
  35 #include "libhppa.h"
  36 #include "elf/hppa.h"
  37
  38 /* ELF/HPPA relocation types */
  39
  40 typedef enum
  41   {
  42     /* Address relocation types
  43        These relocation types do simple base + offset relocations.  */
  44
  45     R_PARISC_NONE = 0x00,
  46     R_PARISC_DIR32 = 0x01,
  47     R_PARISC_DIR21L = 0x02,
  48     R_PARISC_DIR17R = 0x03,
  49     R_PARISC_DIR17F = 0x04,
  50     R_PARISC_DIR14R = 0x06,
  51
  52     /* PC-relative relocation types
  53        Typically used for calls.
  54        Note PCREL17C and PCREL17F differ only in overflow handling.
  55        PCREL17C never reports a relocation error.
  56
  57        When supporting argument relocations, function calls must be
  58        accompanied by parameter relocation information.  This information is
  59        carried in the ten high-order bits of the addend field.  The remaining
  60        22 bits of of the addend field are sign-extended to form the Addend.
  61
  62        Note the code to build argument relocations depends on the
  63        addend being zero.  A consequence of this limitation is GAS
  64        can not perform relocation reductions for function symbols.  */
  65     R_PARISC_PCREL21L = 0x0a,
  66     R_PARISC_PCREL17R = 0x0b,
  67     R_PARISC_PCREL17F = 0x0c,
  68     R_PARISC_PCREL17C = 0x0d,
  69     R_PARISC_PCREL14R = 0x0e,
  70     R_PARISC_PCREL14F = 0x0f,
  71
  72     /* DP-relative relocation types.  */
  73     R_PARISC_DPREL21L = 0x12,
  74     R_PARISC_DPREL14R = 0x16,
  75     R_PARISC_DPREL14F = 0x17,
  76
  77     /* Data linkage table (DLT) relocation types
  78
  79        SOM DLT_REL fixup requests are used to for static data references
  80        from position-independent code within shared libraries.  They are
  81        similar to the GOT relocation types in some SVR4 implementations.  */
  82
  83     R_PARISC_DLTREL21L = 0x1a,
  84     R_PARISC_DLTREL14R = 0x1e,
  85     R_PARISC_DLTREL14F = 0x1f,
  86
  87     /* DLT indirect relocation types  */
  88     R_PARISC_DLTIND21L = 0x22,
  89     R_PARISC_DLTIND14R = 0x26,
  90     R_PARISC_DLTIND14F = 0x27,
  91
  92     /* Base relative relocation types.  Ugh.  These imply lots of state */
  93     R_PARISC_SETBASE = 0x28,
  94     R_PARISC_BASEREL32 = 0x29,
  95     R_PARISC_BASEREL21L = 0x2a,
  96     R_PARISC_BASEREL17R = 0x2b,
  97     R_PARISC_BASEREL17F = 0x2c,
  98     R_PARISC_BASEREL14R = 0x2e,
  99     R_PARISC_BASEREL14F = 0x2f,
 100
 101     /* Segment relative relocation types.  */
 102     R_PARISC_TEXTREL32 = 0x31,
 103     R_PARISC_DATAREL32 = 0x39,
 104
 105     /* Plabel relocation types.  */
 106     R_PARISC_PLABEL32 = 0x41,
 107     R_PARISC_PLABEL21L = 0x42,
 108     R_PARISC_PLABEL14R = 0x46,
 109
 110     /* PLT relocations.  */
 111     R_PARISC_PLTIND21L = 0x82,
 112     R_PARISC_PLTIND14R = 0x86,
 113     R_PARISC_PLTIND14F = 0x87,
 114
 115     /* Misc relocation types.  */
 116     R_PARISC_COPY = 0x88,
 117     R_PARISC_GLOB_DAT = 0x89,
 118     R_PARISC_JMP_SLOT = 0x8a,
 119     R_PARISC_RELATIVE = 0x8b,
 120     R_PARISC_STUB_CALL_17 = 0x8c,
 121     R_PARISC_UNIMPLEMENTED,
 122   }
 123 elf32_hppa_reloc_type;
 124
 125 #define ELF_HOWTO_TABLE_SIZE    R_PARISC_UNIMPLEMENTED + 1
 126 #define N_PARISC_RELOCS         R_PARISC_UNIMPLEMENTED + 1
 127
 128 /* Define groups of basic relocations.  FIXME:  These should
 129    be the only basic relocations created by GAS.  The rest
 130    should be internal to the BFD backend.
 131
 132    The idea is both SOM and ELF define these basic relocation
 133    types so they map into a SOM or ELF specific relocation
 134    as appropriate.  This allows GAS to share much more code
 135    between the two target object formats.  */
 136
 137 #define R_HPPA_NONE                     R_PARISC_NONE
 138 #define R_HPPA                          R_PARISC_DIR32
 139 #define R_HPPA_GOTOFF                   R_PARISC_DPREL21L
 140 #define R_HPPA_PCREL_CALL               R_PARISC_PCREL21L
 141
 142 /* HPPA symbol table extension entry types */
 143 enum elf32_hppa_symextn_types
 144 {
 145   PARISC_SXT_NULL,
 146   PARISC_SXT_SYMNDX,
 147   PARISC_SXT_ARG_RELOC,
 148 };
 149
 150 /* These macros compose and decompose the value of a symextn entry:
 151
 152    entry_type = ELF32_PARISC_SX_TYPE(word);
 153    entry_value = ELF32_PARISC_SX_VAL(word);
 154    word = ELF32_PARISC_SX_WORD(type,val);  */
 155
 156 #define ELF32_PARISC_SX_TYPE(p)         ((p) >> 24)
 157 #define ELF32_PARISC_SX_VAL(p)          ((p) & 0xFFFFFF)
 158 #define ELF32_PARISC_SX_WORD(type,val)  (((type) << 24) + (val & 0xFFFFFF))
 159
 160 /* The following was added facilitate implementation of the .hppa_symextn
 161    section.  This section is built after the symbol table is built in the
 162    elf_write_object_contents routine (called from bfd_close).  It is built
 163    so late because it requires information that is not known until
 164    the symbol and string table sections have been allocated, and
 165    the symbol table has been built. */
 166
 167 /* Number of "hand-made" target specific sections.  */
 168 #define ELF_TC_FAKE_SECTIONS 1
 169 #define SYMEXTN_SECTION_NAME ".PARISC.symext"
 170
 171 /* FIXME.  Are these external?  (For example used by GAS?).  If so the
 172    names need to change to avoid namespace pollution, if not they should
 173    be moved into elf32-hppa.c.  */
 174 typedef unsigned long symext_entryS;
 175 struct symext_chain
 176   {
 177     symext_entryS entry;
 178     struct symext_chain *next;
 179   };
 180
 181 typedef struct symext_chain symext_chainS;
 182
 183 elf32_hppa_reloc_type **hppa_elf_gen_reloc_type
 184   PARAMS ((bfd *, elf32_hppa_reloc_type, int, int));
 185
 186 asymbol * hppa_look_for_stubs_in_section
 187   PARAMS ((bfd *, bfd *, bfd *, asection *,
 188            int *, struct bfd_link_info *));
 189
 190 void elf_hppa_final_processing PARAMS ((void));
 191 #endif /* _ELF32_HPPA_H */