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  1. /* BFD back-end data structures for ELF files.
  2.    Copyright (C) 1992-2015 Free Software Foundation, Inc.
  3.    Written by Cygnus Support.
  4.  
  5.    This file is part of BFD, the Binary File Descriptor library.
  6.  
  7.    This program is free software; you can redistribute it and/or modify
  8.    it under the terms of the GNU General Public License as published by
  9.    the Free Software Foundation; either version 3 of the License, or
  10.    (at your option) any later version.
  11.  
  12.    This program is distributed in the hope that it will be useful,
  13.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15.    GNU General Public License for more details.
  16.  
  17.    You should have received a copy of the GNU General Public License
  18.    along with this program; if not, write to the Free Software
  19.    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20.    MA 02110-1301, USA.  */
  21.  
  22. #ifndef _LIBELF_H_
  23. #define _LIBELF_H_ 1
  24.  
  25. #include "elf/common.h"
  26. #include "elf/external.h"
  27. #include "elf/internal.h"
  28. #include "bfdlink.h"
  29.  
  30. #ifdef __cplusplus
  31. extern "C" {
  32. #endif
  33.  
  34. /* The number of entries in a section is its size divided by the size
  35.    of a single entry.  This is normally only applicable to reloc and
  36.    symbol table sections.
  37.    PR 9934: It is possible to have relocations that do not refer to
  38.    symbols, thus it is also possible to have a relocation section in
  39.    an object file, but no symbol table.  */
  40. #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_entsize > 0 ? (shdr)->sh_size / (shdr)->sh_entsize : 0)
  41.  
  42. /* If size isn't specified as 64 or 32, NAME macro should fail.  */
  43. #ifndef NAME
  44. #if ARCH_SIZE == 64
  45. #define NAME(x, y) x ## 64 ## _ ## y
  46. #endif
  47. #if ARCH_SIZE == 32
  48. #define NAME(x, y) x ## 32 ## _ ## y
  49. #endif
  50. #endif
  51.  
  52. #ifndef NAME
  53. #define NAME(x, y) x ## NOSIZE ## _ ## y
  54. #endif
  55.  
  56. #define ElfNAME(X)      NAME(Elf,X)
  57. #define elfNAME(X)      NAME(elf,X)
  58.  
  59. /* Information held for an ELF symbol.  The first field is the
  60.    corresponding asymbol.  Every symbol is an ELF file is actually a
  61.    pointer to this structure, although it is often handled as a
  62.    pointer to an asymbol.  */
  63.  
  64. typedef struct
  65. {
  66.   /* The BFD symbol.  */
  67.   asymbol symbol;
  68.   /* ELF symbol information.  */
  69.   Elf_Internal_Sym internal_elf_sym;
  70.   /* Backend specific information.  */
  71.   union
  72.     {
  73.       unsigned int hppa_arg_reloc;
  74.       void *mips_extr;
  75.       void *any;
  76.     }
  77.   tc_data;
  78.  
  79.   /* Version information.  This is from an Elf_Internal_Versym
  80.      structure in a SHT_GNU_versym section.  It is zero if there is no
  81.      version information.  */
  82.   unsigned short version;
  83.  
  84. } elf_symbol_type;
  85. struct elf_strtab_hash;
  86. struct got_entry;
  87. struct plt_entry;
  88.  
  89. union gotplt_union
  90.   {
  91.     bfd_signed_vma refcount;
  92.     bfd_vma offset;
  93.     struct got_entry *glist;
  94.     struct plt_entry *plist;
  95.   };
  96.  
  97. struct elf_link_virtual_table_entry
  98.   {
  99.     /* Virtual table entry use information.  This array is nominally of size
  100.        size/sizeof(target_void_pointer), though we have to be able to assume
  101.        and track a size while the symbol is still undefined.  It is indexed
  102.        via offset/sizeof(target_void_pointer).  */
  103.     size_t size;
  104.     bfd_boolean *used;
  105.  
  106.     /* Virtual table derivation info.  */
  107.     struct elf_link_hash_entry *parent;
  108.   };
  109.  
  110. /* ELF symbol version.  */
  111. enum elf_symbol_version
  112.   {
  113.     unknown = 0,
  114.     unversioned,
  115.     versioned,
  116.     versioned_hidden
  117.   };
  118.  
  119. /* ELF linker hash table entries.  */
  120.  
  121. struct elf_link_hash_entry
  122. {
  123.   struct bfd_link_hash_entry root;
  124.  
  125.   /* Symbol index in output file.  This is initialized to -1.  It is
  126.      set to -2 if the symbol is used by a reloc.  */
  127.   long indx;
  128.  
  129.   /* Symbol index as a dynamic symbol.  Initialized to -1, and remains
  130.      -1 if this is not a dynamic symbol.  */
  131.   /* ??? Note that this is consistently used as a synonym for tests
  132.      against whether we can perform various simplifying transformations
  133.      to the code.  (E.g. changing a pc-relative jump to a PLT entry
  134.      into a pc-relative jump to the target function.)  That test, which
  135.      is often relatively complex, and someplaces wrong or incomplete,
  136.      should really be replaced by a predicate in elflink.c.
  137.  
  138.      End result: this field -1 does not indicate that the symbol is
  139.      not in the dynamic symbol table, but rather that the symbol is
  140.      not visible outside this DSO.  */
  141.   long dynindx;
  142.  
  143.   /* If this symbol requires an entry in the global offset table, the
  144.      processor specific backend uses this field to track usage and
  145.      final offset.  Two schemes are supported:  The first assumes that
  146.      a symbol may only have one GOT entry, and uses REFCOUNT until
  147.      size_dynamic_sections, at which point the contents of the .got is
  148.      fixed.  Afterward, if OFFSET is -1, then the symbol does not
  149.      require a global offset table entry.  The second scheme allows
  150.      multiple GOT entries per symbol, managed via a linked list
  151.      pointed to by GLIST.  */
  152.   union gotplt_union got;
  153.  
  154.   /* Same, but tracks a procedure linkage table entry.  */
  155.   union gotplt_union plt;
  156.  
  157.   /* Symbol size.  */
  158.   bfd_size_type size;
  159.  
  160.   /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.).  */
  161.   unsigned int type : 8;
  162.  
  163.   /* Symbol st_other value, symbol visibility.  */
  164.   unsigned int other : 8;
  165.  
  166.   /* The symbol's st_target_internal value (see Elf_Internal_Sym).  */
  167.   unsigned int target_internal : 8;
  168.  
  169.   /* Symbol is referenced by a non-shared object (other than the object
  170.      in which it is defined).  */
  171.   unsigned int ref_regular : 1;
  172.   /* Symbol is defined by a non-shared object.  */
  173.   unsigned int def_regular : 1;
  174.   /* Symbol is referenced by a shared object.  */
  175.   unsigned int ref_dynamic : 1;
  176.   /* Symbol is defined by a shared object.  */
  177.   unsigned int def_dynamic : 1;
  178.   /* Symbol has a non-weak reference from a non-shared object (other than
  179.      the object in which it is defined).  */
  180.   unsigned int ref_regular_nonweak : 1;
  181.   /* Dynamic symbol has been adjustd.  */
  182.   unsigned int dynamic_adjusted : 1;
  183.   /* Symbol needs a copy reloc.  */
  184.   unsigned int needs_copy : 1;
  185.   /* Symbol needs a procedure linkage table entry.  */
  186.   unsigned int needs_plt : 1;
  187.   /* Symbol appears in a non-ELF input file.  */
  188.   unsigned int non_elf : 1;
  189.   /* Symbol version information.  */
  190.   ENUM_BITFIELD (elf_symbol_version) versioned : 2;
  191.   /* Symbol was forced to local scope due to a version script file.  */
  192.   unsigned int forced_local : 1;
  193.   /* Symbol was forced to be dynamic due to a version script file.  */
  194.   unsigned int dynamic : 1;
  195.   /* Symbol was marked during garbage collection.  */
  196.   unsigned int mark : 1;
  197.   /* Symbol is referenced by a non-GOT/non-PLT relocation.  This is
  198.      not currently set by all the backends.  */
  199.   unsigned int non_got_ref : 1;
  200.   /* Symbol has a definition in a shared object.
  201.      FIXME: There is no real need for this field if def_dynamic is never
  202.      cleared and all places that test def_dynamic also test def_regular.  */
  203.   unsigned int dynamic_def : 1;
  204.   /* Symbol has a non-weak reference from a shared object.  */
  205.   unsigned int ref_dynamic_nonweak : 1;
  206.   /* Symbol is referenced with a relocation where C/C++ pointer equality
  207.      matters.  */
  208.   unsigned int pointer_equality_needed : 1;
  209.   /* Symbol is a unique global symbol.  */
  210.   unsigned int unique_global : 1;
  211.   /* Symbol is defined by a shared library with non-default visibility
  212.      in a read/write section.  */
  213.   unsigned int protected_def : 1;
  214.  
  215.   /* String table index in .dynstr if this is a dynamic symbol.  */
  216.   unsigned long dynstr_index;
  217.  
  218.   union
  219.   {
  220.     /* If this is a weak defined symbol from a dynamic object, this
  221.        field points to a defined symbol with the same value, if there is
  222.        one.  Otherwise it is NULL.  */
  223.     struct elf_link_hash_entry *weakdef;
  224.  
  225.     /* Hash value of the name computed using the ELF hash function.
  226.        Used part way through size_dynamic_sections, after we've finished
  227.        with weakdefs.  */
  228.     unsigned long elf_hash_value;
  229.   } u;
  230.  
  231.   /* Version information.  */
  232.   union
  233.   {
  234.     /* This field is used for a symbol which is not defined in a
  235.        regular object.  It points to the version information read in
  236.        from the dynamic object.  */
  237.     Elf_Internal_Verdef *verdef;
  238.     /* This field is used for a symbol which is defined in a regular
  239.        object.  It is set up in size_dynamic_sections.  It points to
  240.        the version information we should write out for this symbol.  */
  241.     struct bfd_elf_version_tree *vertree;
  242.   } verinfo;
  243.  
  244.   struct elf_link_virtual_table_entry *vtable;
  245. };
  246.  
  247. /* Will references to this symbol always reference the symbol
  248.    in this object?  */
  249. #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
  250.   _bfd_elf_symbol_refs_local_p (H, INFO, 0)
  251.  
  252. /* Will _calls_ to this symbol always call the version in this object?  */
  253. #define SYMBOL_CALLS_LOCAL(INFO, H) \
  254.   _bfd_elf_symbol_refs_local_p (H, INFO, 1)
  255.  
  256. /* Common symbols that are turned into definitions don't have the
  257.    DEF_REGULAR flag set, so they might appear to be undefined.
  258.    Symbols defined in linker scripts also don't have DEF_REGULAR set.  */
  259. #define ELF_COMMON_DEF_P(H) \
  260.   (!(H)->def_regular                                                    \
  261.    && !(H)->def_dynamic                                                 \
  262.    && (H)->root.type == bfd_link_hash_defined)
  263.  
  264. /* Records local symbols to be emitted in the dynamic symbol table.  */
  265.  
  266. struct elf_link_local_dynamic_entry
  267. {
  268.   struct elf_link_local_dynamic_entry *next;
  269.  
  270.   /* The input bfd this symbol came from.  */
  271.   bfd *input_bfd;
  272.  
  273.   /* The index of the local symbol being copied.  */
  274.   long input_indx;
  275.  
  276.   /* The index in the outgoing dynamic symbol table.  */
  277.   long dynindx;
  278.  
  279.   /* A copy of the input symbol.  */
  280.   Elf_Internal_Sym isym;
  281. };
  282.  
  283. struct elf_link_loaded_list
  284. {
  285.   struct elf_link_loaded_list *next;
  286.   bfd *abfd;
  287. };
  288.  
  289. /* Structures used by the eh_frame optimization code.  */
  290. struct eh_cie_fde
  291. {
  292.   union {
  293.     struct {
  294.       /* If REMOVED == 1, this is the CIE that the FDE originally used.
  295.          The CIE belongs to the same .eh_frame input section as the FDE.
  296.  
  297.          If REMOVED == 0, this is the CIE that we have chosen to use for
  298.          the output FDE.  The CIE's REMOVED field is also 0, but the CIE
  299.          might belong to a different .eh_frame input section from the FDE.
  300.  
  301.          May be NULL to signify that the FDE should be discarded.  */
  302.       struct eh_cie_fde *cie_inf;
  303.       struct eh_cie_fde *next_for_section;
  304.     } fde;
  305.     struct {
  306.       /* CIEs have three states:
  307.  
  308.          - REMOVED && !MERGED: Slated for removal because we haven't yet
  309.            proven that an FDE needs it.  FULL_CIE, if nonnull, points to
  310.            more detailed information about the CIE.
  311.  
  312.          - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
  313.            which may not belong to the same input section.
  314.  
  315.          - !REMOVED: We have decided to keep this CIE.  SEC is the
  316.            .eh_frame input section that contains the CIE.  */
  317.       union {
  318.         struct cie *full_cie;
  319.         struct eh_cie_fde *merged_with;
  320.         asection *sec;
  321.       } u;
  322.  
  323.       /* The offset of the personality data from the start of the CIE,
  324.          or 0 if the CIE doesn't have any.  */
  325.       unsigned int personality_offset : 8;
  326.  
  327.       /* True if we have marked relocations associated with this CIE.  */
  328.       unsigned int gc_mark : 1;
  329.  
  330.       /* True if we have decided to turn an absolute LSDA encoding into
  331.          a PC-relative one.  */
  332.       unsigned int make_lsda_relative : 1;
  333.  
  334.       /* True if we have decided to turn an absolute personality
  335.          encoding into a PC-relative one.  */
  336.       unsigned int make_per_encoding_relative : 1;
  337.  
  338.       /* True if the CIE contains personality data and if that
  339.          data uses a PC-relative encoding.  Always true when
  340.          make_per_encoding_relative is.  */
  341.       unsigned int per_encoding_relative : 1;
  342.  
  343.       /* True if we need to add an 'R' (FDE encoding) entry to the
  344.          CIE's augmentation data.  */
  345.       unsigned int add_fde_encoding : 1;
  346.  
  347.       /* True if we have merged this CIE with another.  */
  348.       unsigned int merged : 1;
  349.  
  350.       /* Unused bits.  */
  351.       unsigned int pad1 : 18;
  352.     } cie;
  353.   } u;
  354.   unsigned int reloc_index;
  355.   unsigned int size;
  356.   unsigned int offset;
  357.   unsigned int new_offset;
  358.   unsigned int fde_encoding : 8;
  359.   unsigned int lsda_encoding : 8;
  360.   unsigned int lsda_offset : 8;
  361.  
  362.   /* True if this entry represents a CIE, false if it represents an FDE.  */
  363.   unsigned int cie : 1;
  364.  
  365.   /* True if this entry is currently marked for removal.  */
  366.   unsigned int removed : 1;
  367.  
  368.   /* True if we need to add a 'z' (augmentation size) entry to the CIE's
  369.      augmentation data, and an associated byte to each of the CIE's FDEs.  */
  370.   unsigned int add_augmentation_size : 1;
  371.  
  372.   /* True if we have decided to convert absolute FDE relocations into
  373.      relative ones.  This applies to the first relocation in the FDE,
  374.      which is against the code that the FDE describes.  */
  375.   unsigned int make_relative : 1;
  376.  
  377.   /* Unused bits.  */
  378.   unsigned int pad1 : 4;
  379.  
  380.   unsigned int *set_loc;
  381. };
  382.  
  383. struct eh_frame_sec_info
  384. {
  385.   unsigned int count;
  386.   struct cie *cies;
  387.   struct eh_cie_fde entry[1];
  388. };
  389.  
  390. struct eh_frame_array_ent
  391. {
  392.   bfd_vma initial_loc;
  393.   bfd_size_type range;
  394.   bfd_vma fde;
  395. };
  396.  
  397. struct htab;
  398.  
  399. #define DWARF2_EH_HDR 1
  400. #define COMPACT_EH_HDR 2
  401.  
  402. /* Endian-neutral code indicating that a function cannot be unwound.  */
  403. #define COMPACT_EH_CANT_UNWIND_OPCODE 0x015d5d01
  404.  
  405. struct dwarf_eh_frame_hdr_info
  406. {
  407.   struct htab *cies;
  408.   unsigned int fde_count;
  409.   /* TRUE if .eh_frame_hdr should contain the sorted search table.
  410.      We build it if we successfully read all .eh_frame input sections
  411.      and recognize them.  */
  412.   bfd_boolean table;
  413.   struct eh_frame_array_ent *array;
  414. };
  415.  
  416. struct compact_eh_frame_hdr_info
  417. {
  418.   unsigned int allocated_entries;
  419.   /* eh_frame_entry fragments.  */
  420.   asection **entries;
  421. };
  422.  
  423. struct eh_frame_hdr_info
  424. {
  425.   asection *hdr_sec;
  426.   unsigned int array_count;
  427.   bfd_boolean frame_hdr_is_compact;
  428.   union
  429.     {
  430.       struct dwarf_eh_frame_hdr_info dwarf;
  431.       struct compact_eh_frame_hdr_info compact;
  432.     }
  433.   u;
  434. };
  435.  
  436. /* Enum used to identify target specific extensions to the elf_obj_tdata
  437.    and elf_link_hash_table structures.  Note the enums deliberately start
  438.    from 1 so that we can detect an uninitialized field.  The generic value
  439.    is last so that additions to this enum do not need to modify more than
  440.    one line.  */
  441. enum elf_target_id
  442. {
  443.   AARCH64_ELF_DATA = 1,
  444.   ALPHA_ELF_DATA,
  445.   ARM_ELF_DATA,
  446.   AVR_ELF_DATA,
  447.   BFIN_ELF_DATA,
  448.   CRIS_ELF_DATA,
  449.   FRV_ELF_DATA,
  450.   HPPA32_ELF_DATA,
  451.   HPPA64_ELF_DATA,
  452.   I386_ELF_DATA,
  453.   IA64_ELF_DATA,
  454.   LM32_ELF_DATA,
  455.   M32R_ELF_DATA,
  456.   M68HC11_ELF_DATA,
  457.   M68K_ELF_DATA,
  458.   METAG_ELF_DATA,
  459.   MICROBLAZE_ELF_DATA,
  460.   MIPS_ELF_DATA,
  461.   MN10300_ELF_DATA,
  462.   NDS32_ELF_DATA,
  463.   NIOS2_ELF_DATA,
  464.   OR1K_ELF_DATA,
  465.   PPC32_ELF_DATA,
  466.   PPC64_ELF_DATA,
  467.   S390_ELF_DATA,
  468.   SH_ELF_DATA,
  469.   SPARC_ELF_DATA,
  470.   SPU_ELF_DATA,
  471.   TIC6X_ELF_DATA,
  472.   X86_64_ELF_DATA,
  473.   XTENSA_ELF_DATA,
  474.   XGATE_ELF_DATA,
  475.   TILEGX_ELF_DATA,
  476.   TILEPRO_ELF_DATA,
  477.   GENERIC_ELF_DATA
  478. };
  479.  
  480. struct elf_sym_strtab
  481. {
  482.   Elf_Internal_Sym sym;
  483.   unsigned long dest_index;
  484.   unsigned long destshndx_index;
  485. };
  486.  
  487. /* ELF linker hash table.  */
  488.  
  489. struct elf_link_hash_table
  490. {
  491.   struct bfd_link_hash_table root;
  492.  
  493.   /* An identifier used to distinguish different target
  494.      specific extensions to this structure.  */
  495.   enum elf_target_id hash_table_id;
  496.  
  497.   /* Whether we have created the special dynamic sections required
  498.      when linking against or generating a shared object.  */
  499.   bfd_boolean dynamic_sections_created;
  500.  
  501.   /* True if this target has relocatable executables, so needs dynamic
  502.      section symbols.  */
  503.   bfd_boolean is_relocatable_executable;
  504.  
  505.   /* The BFD used to hold special sections created by the linker.
  506.      This will be the first BFD found which requires these sections to
  507.      be created.  */
  508.   bfd *dynobj;
  509.  
  510.   /* The value to use when initialising got.refcount/offset and
  511.      plt.refcount/offset in an elf_link_hash_entry.  Set to zero when
  512.      the values are refcounts.  Set to init_got_offset/init_plt_offset
  513.      in size_dynamic_sections when the values may be offsets.  */
  514.   union gotplt_union init_got_refcount;
  515.   union gotplt_union init_plt_refcount;
  516.  
  517.   /* The value to use for got.refcount/offset and plt.refcount/offset
  518.      when the values may be offsets.  Normally (bfd_vma) -1.  */
  519.   union gotplt_union init_got_offset;
  520.   union gotplt_union init_plt_offset;
  521.  
  522.   /* The number of symbols found in the link which must be put into
  523.      the .dynsym section.  */
  524.   bfd_size_type dynsymcount;
  525.  
  526.   /* The string table of dynamic symbols, which becomes the .dynstr
  527.      section.  */
  528.   struct elf_strtab_hash *dynstr;
  529.  
  530.   /* The number of symbol strings found in the link which must be put
  531.      into the .strtab section.  */
  532.   bfd_size_type strtabcount;
  533.  
  534.   /* The array size of the symbol string table, which becomes the
  535.      .strtab section.  */
  536.   bfd_size_type strtabsize;
  537.  
  538.   /* The array of strings, which becomes the .strtab section.  */
  539.   struct elf_sym_strtab *strtab;
  540.  
  541.   /* The number of buckets in the hash table in the .hash section.
  542.      This is based on the number of dynamic symbols.  */
  543.   bfd_size_type bucketcount;
  544.  
  545.   /* A linked list of DT_NEEDED names found in dynamic objects
  546.      included in the link.  */
  547.   struct bfd_link_needed_list *needed;
  548.  
  549.   /* Sections in the output bfd that provides a section symbol
  550.      to be used by relocations emitted against local symbols.
  551.      Most targets will not use data_index_section.  */
  552.   asection *text_index_section;
  553.   asection *data_index_section;
  554.  
  555.   /* The _GLOBAL_OFFSET_TABLE_ symbol.  */
  556.   struct elf_link_hash_entry *hgot;
  557.  
  558.   /* The _PROCEDURE_LINKAGE_TABLE_ symbol.  */
  559.   struct elf_link_hash_entry *hplt;
  560.  
  561.   /* The _DYNAMIC symbol.  */
  562.   struct elf_link_hash_entry *hdynamic;
  563.  
  564.   /* A pointer to information used to merge SEC_MERGE sections.  */
  565.   void *merge_info;
  566.  
  567.   /* Used to link stabs in sections.  */
  568.   struct stab_info stab_info;
  569.  
  570.   /* Used by eh_frame code when editing .eh_frame.  */
  571.   struct eh_frame_hdr_info eh_info;
  572.  
  573.   /* A linked list of local symbols to be added to .dynsym.  */
  574.   struct elf_link_local_dynamic_entry *dynlocal;
  575.  
  576.   /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
  577.      objects included in the link.  */
  578.   struct bfd_link_needed_list *runpath;
  579.  
  580.   /* Cached first output tls section and size of PT_TLS segment.  */
  581.   asection *tls_sec;
  582.   bfd_size_type tls_size;
  583.  
  584.   /* A linked list of BFD's loaded in the link.  */
  585.   struct elf_link_loaded_list *loaded;
  586.  
  587.   /* Short-cuts to get to dynamic linker sections.  */
  588.   asection *sgot;
  589.   asection *sgotplt;
  590.   asection *srelgot;
  591.   asection *splt;
  592.   asection *srelplt;
  593.   asection *igotplt;
  594.   asection *iplt;
  595.   asection *irelplt;
  596.   asection *irelifunc;
  597.   asection *dynsym;
  598. };
  599.  
  600. /* Look up an entry in an ELF linker hash table.  */
  601.  
  602. #define elf_link_hash_lookup(table, string, create, copy, follow)       \
  603.   ((struct elf_link_hash_entry *)                                       \
  604.    bfd_link_hash_lookup (&(table)->root, (string), (create),            \
  605.                          (copy), (follow)))
  606.  
  607. /* Traverse an ELF linker hash table.  */
  608.  
  609. #define elf_link_hash_traverse(table, func, info)                       \
  610.   (bfd_link_hash_traverse                                               \
  611.    (&(table)->root,                                                     \
  612.     (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func),    \
  613.     (info)))
  614.  
  615. /* Get the ELF linker hash table from a link_info structure.  */
  616.  
  617. #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
  618.  
  619. #define elf_hash_table_id(table)        ((table) -> hash_table_id)
  620.  
  621. /* Returns TRUE if the hash table is a struct elf_link_hash_table.  */
  622. #define is_elf_hash_table(htab)                                         \
  623.   (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
  624.  
  625. /* Used by bfd_sym_from_r_symndx to cache a small number of local
  626.    symbols.  */
  627. #define LOCAL_SYM_CACHE_SIZE 32
  628. struct sym_cache
  629. {
  630.   bfd *abfd;
  631.   unsigned long indx[LOCAL_SYM_CACHE_SIZE];
  632.   Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
  633. };
  634. /* Constant information held for an ELF backend.  */
  635.  
  636. struct elf_size_info {
  637.   unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
  638.   unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
  639.  
  640.   /* The size of entries in the .hash section.  */
  641.   unsigned char sizeof_hash_entry;
  642.  
  643.   /* The number of internal relocations to allocate per external
  644.      relocation entry.  */
  645.   unsigned char int_rels_per_ext_rel;
  646.   /* We use some fixed size arrays.  This should be large enough to
  647.      handle all back-ends.  */
  648. #define MAX_INT_RELS_PER_EXT_REL 3
  649.  
  650.   unsigned char arch_size, log_file_align;
  651.   unsigned char elfclass, ev_current;
  652.   int (*write_out_phdrs)
  653.     (bfd *, const Elf_Internal_Phdr *, unsigned int);
  654.   bfd_boolean
  655.     (*write_shdrs_and_ehdr) (bfd *);
  656.   bfd_boolean (*checksum_contents)
  657.     (bfd * , void (*) (const void *, size_t, void *), void *);
  658.   void (*write_relocs)
  659.     (bfd *, asection *, void *);
  660.   bfd_boolean (*swap_symbol_in)
  661.     (bfd *, const void *, const void *, Elf_Internal_Sym *);
  662.   void (*swap_symbol_out)
  663.     (bfd *, const Elf_Internal_Sym *, void *, void *);
  664.   bfd_boolean (*slurp_reloc_table)
  665.     (bfd *, asection *, asymbol **, bfd_boolean);
  666.   long (*slurp_symbol_table)
  667.     (bfd *, asymbol **, bfd_boolean);
  668.   void (*swap_dyn_in)
  669.     (bfd *, const void *, Elf_Internal_Dyn *);
  670.   void (*swap_dyn_out)
  671.     (bfd *, const Elf_Internal_Dyn *, void *);
  672.  
  673.   /* This function is called to swap in a REL relocation.  If an
  674.      external relocation corresponds to more than one internal
  675.      relocation, then all relocations are swapped in at once.  */
  676.   void (*swap_reloc_in)
  677.     (bfd *, const bfd_byte *, Elf_Internal_Rela *);
  678.  
  679.   /* This function is called to swap out a REL relocation.  */
  680.   void (*swap_reloc_out)
  681.     (bfd *, const Elf_Internal_Rela *, bfd_byte *);
  682.  
  683.   /* This function is called to swap in a RELA relocation.  If an
  684.      external relocation corresponds to more than one internal
  685.      relocation, then all relocations are swapped in at once.  */
  686.   void (*swap_reloca_in)
  687.     (bfd *, const bfd_byte *, Elf_Internal_Rela *);
  688.  
  689.   /* This function is called to swap out a RELA relocation.  */
  690.   void (*swap_reloca_out)
  691.     (bfd *, const Elf_Internal_Rela *, bfd_byte *);
  692. };
  693.  
  694. #define elf_symbol_from(ABFD,S) \
  695.         (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
  696.           && (S)->the_bfd->tdata.elf_obj_data != 0) \
  697.          ? (elf_symbol_type *) (S) \
  698.          : 0)
  699.  
  700. enum elf_reloc_type_class {
  701.   reloc_class_normal,
  702.   reloc_class_relative,
  703.   reloc_class_plt,
  704.   reloc_class_copy,
  705.   reloc_class_ifunc
  706. };
  707.  
  708. struct elf_reloc_cookie
  709. {
  710.   Elf_Internal_Rela *rels, *rel, *relend;
  711.   Elf_Internal_Sym *locsyms;
  712.   bfd *abfd;
  713.   size_t locsymcount;
  714.   size_t extsymoff;
  715.   struct elf_link_hash_entry **sym_hashes;
  716.   int r_sym_shift;
  717.   bfd_boolean bad_symtab;
  718. };
  719.  
  720. /* The level of IRIX compatibility we're striving for.  */
  721.  
  722. typedef enum {
  723.   ict_none,
  724.   ict_irix5,
  725.   ict_irix6
  726. } irix_compat_t;
  727.  
  728. /* Mapping of ELF section names and types.  */
  729. struct bfd_elf_special_section
  730. {
  731.   const char *prefix;
  732.   int prefix_length;
  733.   /* 0 means name must match PREFIX exactly.
  734.      -1 means name must start with PREFIX followed by an arbitrary string.
  735.      -2 means name must match PREFIX exactly or consist of PREFIX followed
  736.      by a dot then anything.
  737.      > 0 means name must start with the first PREFIX_LENGTH chars of
  738.      PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX.  */
  739.   int suffix_length;
  740.   int type;
  741.   bfd_vma attr;
  742. };
  743.  
  744. enum action_discarded
  745.   {
  746.     COMPLAIN = 1,
  747.     PRETEND = 2
  748.   };
  749.  
  750. typedef asection * (*elf_gc_mark_hook_fn)
  751.   (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
  752.    struct elf_link_hash_entry *, Elf_Internal_Sym *);
  753.  
  754. struct elf_backend_data
  755. {
  756.   /* The architecture for this backend.  */
  757.   enum bfd_architecture arch;
  758.  
  759.   /* An identifier used to distinguish different target specific
  760.      extensions to elf_obj_tdata and elf_link_hash_table structures.  */
  761.   enum elf_target_id target_id;
  762.  
  763.   /* The ELF machine code (EM_xxxx) for this backend.  */
  764.   int elf_machine_code;
  765.  
  766.   /* EI_OSABI. */
  767.   int elf_osabi;
  768.  
  769.   /* The maximum page size for this backend.  */
  770.   bfd_vma maxpagesize;
  771.  
  772.   /* The minimum page size for this backend.  An input object will not be
  773.      considered page aligned unless its sections are correctly aligned for
  774.      pages at least this large.  May be smaller than maxpagesize.  */
  775.   bfd_vma minpagesize;
  776.  
  777.   /* The common page size for this backend.  */
  778.   bfd_vma commonpagesize;
  779.  
  780.   /* The BFD flags applied to sections created for dynamic linking.  */
  781.   flagword dynamic_sec_flags;
  782.  
  783.   /* Architecture-specific data for this backend.
  784.      This is actually a pointer to some type like struct elf_ARCH_data.  */
  785.   const void *arch_data;
  786.  
  787.   /* A function to translate an ELF RELA relocation to a BFD arelent
  788.      structure.  */
  789.   void (*elf_info_to_howto)
  790.     (bfd *, arelent *, Elf_Internal_Rela *);
  791.  
  792.   /* A function to translate an ELF REL relocation to a BFD arelent
  793.      structure.  */
  794.   void (*elf_info_to_howto_rel)
  795.     (bfd *, arelent *, Elf_Internal_Rela *);
  796.  
  797.   /* A function to determine whether a symbol is global when
  798.      partitioning the symbol table into local and global symbols.
  799.      This should be NULL for most targets, in which case the correct
  800.      thing will be done.  MIPS ELF, at least on the Irix 5, has
  801.      special requirements.  */
  802.   bfd_boolean (*elf_backend_sym_is_global)
  803.     (bfd *, asymbol *);
  804.  
  805.   /* The remaining functions are hooks which are called only if they
  806.      are not NULL.  */
  807.  
  808.   /* A function to permit a backend specific check on whether a
  809.      particular BFD format is relevant for an object file, and to
  810.      permit the backend to set any global information it wishes.  When
  811.      this is called elf_elfheader is set, but anything else should be
  812.      used with caution.  If this returns FALSE, the check_format
  813.      routine will return a bfd_error_wrong_format error.  */
  814.   bfd_boolean (*elf_backend_object_p)
  815.     (bfd *);
  816.  
  817.   /* A function to do additional symbol processing when reading the
  818.      ELF symbol table.  This is where any processor-specific special
  819.      section indices are handled.  */
  820.   void (*elf_backend_symbol_processing)
  821.     (bfd *, asymbol *);
  822.  
  823.   /* A function to do additional symbol processing after reading the
  824.      entire ELF symbol table.  */
  825.   bfd_boolean (*elf_backend_symbol_table_processing)
  826.     (bfd *, elf_symbol_type *, unsigned int);
  827.  
  828.   /* A function to set the type of the info field.  Processor-specific
  829.      types should be handled here.  */
  830.   int (*elf_backend_get_symbol_type)
  831.     (Elf_Internal_Sym *, int);
  832.  
  833.   /* A function to return the linker hash table entry of a symbol that
  834.      might be satisfied by an archive symbol.  */
  835.   struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
  836.     (bfd *, struct bfd_link_info *, const char *);
  837.  
  838.   /* Return true if local section symbols should have a non-null st_name.
  839.      NULL implies false.  */
  840.   bfd_boolean (*elf_backend_name_local_section_symbols)
  841.     (bfd *);
  842.  
  843.   /* A function to do additional processing on the ELF section header
  844.      just before writing it out.  This is used to set the flags and
  845.      type fields for some sections, or to actually write out data for
  846.      unusual sections.  */
  847.   bfd_boolean (*elf_backend_section_processing)
  848.     (bfd *, Elf_Internal_Shdr *);
  849.  
  850.   /* A function to handle unusual section types when creating BFD
  851.      sections from ELF sections.  */
  852.   bfd_boolean (*elf_backend_section_from_shdr)
  853.     (bfd *, Elf_Internal_Shdr *, const char *, int);
  854.  
  855.   /* A function to convert machine dependent ELF section header flags to
  856.      BFD internal section header flags.  */
  857.   bfd_boolean (*elf_backend_section_flags)
  858.     (flagword *, const Elf_Internal_Shdr *);
  859.  
  860.   /* A function that returns a struct containing ELF section flags and
  861.      type for the given BFD section.   */
  862.   const struct bfd_elf_special_section * (*get_sec_type_attr)
  863.     (bfd *, asection *);
  864.  
  865.   /* A function to handle unusual program segment types when creating BFD
  866.      sections from ELF program segments.  */
  867.   bfd_boolean (*elf_backend_section_from_phdr)
  868.     (bfd *, Elf_Internal_Phdr *, int, const char *);
  869.  
  870.   /* A function to set up the ELF section header for a BFD section in
  871.      preparation for writing it out.  This is where the flags and type
  872.      fields are set for unusual sections.  */
  873.   bfd_boolean (*elf_backend_fake_sections)
  874.     (bfd *, Elf_Internal_Shdr *, asection *);
  875.  
  876.   /* A function to get the ELF section index for a BFD section.  If
  877.      this returns TRUE, the section was found.  If it is a normal ELF
  878.      section, *RETVAL should be left unchanged.  If it is not a normal
  879.      ELF section *RETVAL should be set to the SHN_xxxx index.  */
  880.   bfd_boolean (*elf_backend_section_from_bfd_section)
  881.     (bfd *, asection *, int *retval);
  882.  
  883.   /* If this field is not NULL, it is called by the add_symbols phase
  884.      of a link just before adding a symbol to the global linker hash
  885.      table.  It may modify any of the fields as it wishes.  If *NAME
  886.      is set to NULL, the symbol will be skipped rather than being
  887.      added to the hash table.  This function is responsible for
  888.      handling all processor dependent symbol bindings and section
  889.      indices, and must set at least *FLAGS and *SEC for each processor
  890.      dependent case; failure to do so will cause a link error.  */
  891.   bfd_boolean (*elf_add_symbol_hook)
  892.     (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
  893.      const char **name, flagword *flags, asection **sec, bfd_vma *value);
  894.  
  895.   /* If this field is not NULL, it is called by the elf_link_output_sym
  896.      phase of a link for each symbol which will appear in the object file.
  897.      On error, this function returns 0.  1 is returned when the symbol
  898.      should be output, 2 is returned when the symbol should be discarded.  */
  899.   int (*elf_backend_link_output_symbol_hook)
  900.     (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
  901.      asection *, struct elf_link_hash_entry *);
  902.  
  903.   /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
  904.      linker the first time it encounters a dynamic object in the link.
  905.      This function must create any sections required for dynamic
  906.      linking.  The ABFD argument is a dynamic object.  The .interp,
  907.      .dynamic, .dynsym, .dynstr, and .hash functions have already been
  908.      created, and this function may modify the section flags if
  909.      desired.  This function will normally create the .got and .plt
  910.      sections, but different backends have different requirements.  */
  911.   bfd_boolean (*elf_backend_create_dynamic_sections)
  912.     (bfd *abfd, struct bfd_link_info *info);
  913.  
  914.   /* When creating a shared library, determine whether to omit the
  915.      dynamic symbol for the section.  */
  916.   bfd_boolean (*elf_backend_omit_section_dynsym)
  917.     (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
  918.  
  919.   /* Return TRUE if relocations of targets are compatible to the extent
  920.      that CHECK_RELOCS will properly process them.  PR 4424.  */
  921.   bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
  922.  
  923.   /* The CHECK_RELOCS function is called by the add_symbols phase of
  924.      the ELF backend linker.  It is called once for each section with
  925.      relocs of an object file, just after the symbols for the object
  926.      file have been added to the global linker hash table.  The
  927.      function must look through the relocs and do any special handling
  928.      required.  This generally means allocating space in the global
  929.      offset table, and perhaps allocating space for a reloc.  The
  930.      relocs are always passed as Rela structures; if the section
  931.      actually uses Rel structures, the r_addend field will always be
  932.      zero.  */
  933.   bfd_boolean (*check_relocs)
  934.     (bfd *abfd, struct bfd_link_info *info, asection *o,
  935.      const Elf_Internal_Rela *relocs);
  936.  
  937.   /* The CHECK_DIRECTIVES function is called once per input file by
  938.      the add_symbols phase of the ELF backend linker.  The function
  939.      must inspect the bfd and create any additional symbols according
  940.      to any custom directives in the bfd.  */
  941.   bfd_boolean (*check_directives)
  942.     (bfd *abfd, struct bfd_link_info *info);
  943.  
  944.   /* The NOTICE_AS_NEEDED function is called as the linker is about to
  945.      handle an as-needed lib (ACT = notice_as_needed), and after the
  946.      linker has decided to keep the lib (ACT = notice_needed) or when
  947.      the lib is not needed (ACT = notice_not_needed).  */
  948.   bfd_boolean (*notice_as_needed)
  949.     (bfd *abfd, struct bfd_link_info *info, enum notice_asneeded_action act);
  950.  
  951.   /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
  952.      linker for every symbol which is defined by a dynamic object and
  953.      referenced by a regular object.  This is called after all the
  954.      input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
  955.      function has been called.  The hash table entry should be
  956.      bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
  957.      defined in a section from a dynamic object.  Dynamic object
  958.      sections are not included in the final link, and this function is
  959.      responsible for changing the value to something which the rest of
  960.      the link can deal with.  This will normally involve adding an
  961.      entry to the .plt or .got or some such section, and setting the
  962.      symbol to point to that.  */
  963.   bfd_boolean (*elf_backend_adjust_dynamic_symbol)
  964.     (struct bfd_link_info *info, struct elf_link_hash_entry *h);
  965.  
  966.   /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
  967.      after all the linker input files have been seen but before the
  968.      section sizes have been set.  This is called after
  969.      ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS.  */
  970.   bfd_boolean (*elf_backend_always_size_sections)
  971.     (bfd *output_bfd, struct bfd_link_info *info);
  972.  
  973.   /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
  974.      linker after all the linker input files have been seen but before
  975.      the sections sizes have been set.  This is called after
  976.      ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
  977.      It is only called when linking against a dynamic object.  It must
  978.      set the sizes of the dynamic sections, and may fill in their
  979.      contents as well.  The generic ELF linker can handle the .dynsym,
  980.      .dynstr and .hash sections.  This function must handle the
  981.      .interp section and any sections created by the
  982.      CREATE_DYNAMIC_SECTIONS entry point.  */
  983.   bfd_boolean (*elf_backend_size_dynamic_sections)
  984.     (bfd *output_bfd, struct bfd_link_info *info);
  985.  
  986.   /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
  987.      we keep to use as a base for relocs and symbols.  */
  988.   void (*elf_backend_init_index_section)
  989.     (bfd *output_bfd, struct bfd_link_info *info);
  990.  
  991.   /* The RELOCATE_SECTION function is called by the ELF backend linker
  992.      to handle the relocations for a section.
  993.  
  994.      The relocs are always passed as Rela structures; if the section
  995.      actually uses Rel structures, the r_addend field will always be
  996.      zero.
  997.  
  998.      This function is responsible for adjust the section contents as
  999.      necessary, and (if using Rela relocs and generating a
  1000.      relocatable output file) adjusting the reloc addend as
  1001.      necessary.
  1002.  
  1003.      This function does not have to worry about setting the reloc
  1004.      address or the reloc symbol index.
  1005.  
  1006.      LOCAL_SYMS is a pointer to the swapped in local symbols.
  1007.  
  1008.      LOCAL_SECTIONS is an array giving the section in the input file
  1009.      corresponding to the st_shndx field of each local symbol.
  1010.  
  1011.      The global hash table entry for the global symbols can be found
  1012.      via elf_sym_hashes (input_bfd).
  1013.  
  1014.      When generating relocatable output, this function must handle
  1015.      STB_LOCAL/STT_SECTION symbols specially.  The output symbol is
  1016.      going to be the section symbol corresponding to the output
  1017.      section, which means that the addend must be adjusted
  1018.      accordingly.
  1019.  
  1020.      Returns FALSE on error, TRUE on success, 2 if successful and
  1021.      relocations should be written for this section.  */
  1022.   int (*elf_backend_relocate_section)
  1023.     (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
  1024.      asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
  1025.      Elf_Internal_Sym *local_syms, asection **local_sections);
  1026.  
  1027.   /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
  1028.      linker just before it writes a symbol out to the .dynsym section.
  1029.      The processor backend may make any required adjustment to the
  1030.      symbol.  It may also take the opportunity to set contents of the
  1031.      dynamic sections.  Note that FINISH_DYNAMIC_SYMBOL is called on
  1032.      all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
  1033.      on those symbols which are defined by a dynamic object.  */
  1034.   bfd_boolean (*elf_backend_finish_dynamic_symbol)
  1035.     (bfd *output_bfd, struct bfd_link_info *info,
  1036.      struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
  1037.  
  1038.   /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
  1039.      linker just before it writes all the dynamic sections out to the
  1040.      output file.  The FINISH_DYNAMIC_SYMBOL will have been called on
  1041.      all dynamic symbols.  */
  1042.   bfd_boolean (*elf_backend_finish_dynamic_sections)
  1043.     (bfd *output_bfd, struct bfd_link_info *info);
  1044.  
  1045.   /* A function to do any beginning processing needed for the ELF file
  1046.      before building the ELF headers and computing file positions.  */
  1047.   void (*elf_backend_begin_write_processing)
  1048.     (bfd *, struct bfd_link_info *);
  1049.  
  1050.   /* A function to do any final processing needed for the ELF file
  1051.      before writing it out.  The LINKER argument is TRUE if this BFD
  1052.      was created by the ELF backend linker.  */
  1053.   void (*elf_backend_final_write_processing)
  1054.     (bfd *, bfd_boolean linker);
  1055.  
  1056.   /* This function is called by get_program_header_size.  It should
  1057.      return the number of additional program segments which this BFD
  1058.      will need.  It should return -1 on error.  */
  1059.   int (*elf_backend_additional_program_headers)
  1060.     (bfd *, struct bfd_link_info *);
  1061.  
  1062.   /* This function is called to modify an existing segment map in a
  1063.      backend specific fashion.  */
  1064.   bfd_boolean (*elf_backend_modify_segment_map)
  1065.     (bfd *, struct bfd_link_info *);
  1066.  
  1067.   /* This function is called to modify program headers just before
  1068.      they are written.  */
  1069.   bfd_boolean (*elf_backend_modify_program_headers)
  1070.     (bfd *, struct bfd_link_info *);
  1071.  
  1072.   /* This function is called before section garbage collection to
  1073.      mark entry symbol sections.  */
  1074.   void (*gc_keep)
  1075.     (struct bfd_link_info *);
  1076.  
  1077.   /* This function is called during section garbage collection to
  1078.      mark sections that define global symbols.  */
  1079.   bfd_boolean (*gc_mark_dynamic_ref)
  1080.     (struct elf_link_hash_entry *, void *);
  1081.  
  1082.   /* This function is called during section gc to discover the section a
  1083.      particular relocation refers to.  */
  1084.   elf_gc_mark_hook_fn gc_mark_hook;
  1085.  
  1086.   /* This function, if defined, is called after the first gc marking pass
  1087.      to allow the backend to mark additional sections.  */
  1088.   bfd_boolean (*gc_mark_extra_sections)
  1089.     (struct bfd_link_info *, elf_gc_mark_hook_fn);
  1090.  
  1091.   /* This function, if defined, is called during the sweep phase of gc
  1092.      in order that a backend might update any data structures it might
  1093.      be maintaining.  */
  1094.   bfd_boolean (*gc_sweep_hook)
  1095.     (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
  1096.  
  1097.   /* This function, if defined, is called after the ELF headers have
  1098.      been created.  This allows for things like the OS and ABI versions
  1099.      to be changed.  */
  1100.   void (*elf_backend_post_process_headers)
  1101.     (bfd *, struct bfd_link_info *);
  1102.  
  1103.   /* This function, if defined, prints a symbol to file and returns the
  1104.      name of the symbol to be printed.  It should return NULL to fall
  1105.      back to default symbol printing.  */
  1106.   const char *(*elf_backend_print_symbol_all)
  1107.     (bfd *, void *, asymbol *);
  1108.  
  1109.   /* This function, if defined, is called after all local symbols and
  1110.      global symbols converted to locals are emitted into the symtab
  1111.      section.  It allows the backend to emit special local symbols
  1112.      not handled in the hash table.  */
  1113.   bfd_boolean (*elf_backend_output_arch_local_syms)
  1114.     (bfd *, struct bfd_link_info *, void *,
  1115.      bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
  1116.                       struct elf_link_hash_entry *));
  1117.  
  1118.   /* This function, if defined, is called after all symbols are emitted
  1119.      into the symtab section.  It allows the backend to emit special
  1120.      global symbols not handled in the hash table.  */
  1121.   bfd_boolean (*elf_backend_output_arch_syms)
  1122.     (bfd *, struct bfd_link_info *, void *,
  1123.      bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
  1124.                       struct elf_link_hash_entry *));
  1125.  
  1126.   /* Copy any information related to dynamic linking from a pre-existing
  1127.      symbol to a newly created symbol.  Also called to copy flags and
  1128.      other back-end info to a weakdef, in which case the symbol is not
  1129.      newly created and plt/got refcounts and dynamic indices should not
  1130.      be copied.  */
  1131.   void (*elf_backend_copy_indirect_symbol)
  1132.     (struct bfd_link_info *, struct elf_link_hash_entry *,
  1133.      struct elf_link_hash_entry *);
  1134.  
  1135.   /* Modify any information related to dynamic linking such that the
  1136.      symbol is not exported.  */
  1137.   void (*elf_backend_hide_symbol)
  1138.     (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
  1139.  
  1140.   /* A function to do additional symbol fixup, called by
  1141.      _bfd_elf_fix_symbol_flags.  */
  1142.   bfd_boolean (*elf_backend_fixup_symbol)
  1143.     (struct bfd_link_info *, struct elf_link_hash_entry *);
  1144.  
  1145.   /* Merge the backend specific symbol attribute.  */
  1146.   void (*elf_backend_merge_symbol_attribute)
  1147.     (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
  1148.      bfd_boolean);
  1149.  
  1150.   /* This function, if defined, will return a string containing the
  1151.      name of a target-specific dynamic tag.  */
  1152.   char *(*elf_backend_get_target_dtag)
  1153.     (bfd_vma);
  1154.  
  1155.   /* Decide whether an undefined symbol is special and can be ignored.
  1156.      This is the case for OPTIONAL symbols on IRIX.  */
  1157.   bfd_boolean (*elf_backend_ignore_undef_symbol)
  1158.     (struct elf_link_hash_entry *);
  1159.  
  1160.   /* Emit relocations.  Overrides default routine for emitting relocs,
  1161.      except during a relocatable link, or if all relocs are being emitted.  */
  1162.   bfd_boolean (*elf_backend_emit_relocs)
  1163.     (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
  1164.      struct elf_link_hash_entry **);
  1165.  
  1166.   /* Count relocations.  Not called for relocatable links
  1167.      or if all relocs are being preserved in the output.  */
  1168.   unsigned int (*elf_backend_count_relocs)
  1169.     (struct bfd_link_info *, asection *);
  1170.  
  1171.   /* Say whether to sort relocs output by ld -r and ld --emit-relocs,
  1172.      by r_offset.  If NULL, default to true.  */
  1173.   bfd_boolean (*sort_relocs_p)
  1174.     (asection *);
  1175.  
  1176.   /* This function, if defined, is called when an NT_PRSTATUS note is found
  1177.      in a core file.  */
  1178.   bfd_boolean (*elf_backend_grok_prstatus)
  1179.     (bfd *, Elf_Internal_Note *);
  1180.  
  1181.   /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
  1182.      note is found in a core file.  */
  1183.   bfd_boolean (*elf_backend_grok_psinfo)
  1184.     (bfd *, Elf_Internal_Note *);
  1185.  
  1186.   /* This function, if defined, is called to write a note to a corefile.  */
  1187.   char *(*elf_backend_write_core_note)
  1188.     (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
  1189.  
  1190.   /* This function, if defined, is called to convert target-specific
  1191.      section flag names into hex values.  */
  1192.   flagword (*elf_backend_lookup_section_flags_hook)
  1193.     (char *);
  1194.  
  1195.   /* This function returns class of a reloc type.  */
  1196.   enum elf_reloc_type_class (*elf_backend_reloc_type_class)
  1197.   (const struct bfd_link_info *, const asection *, const Elf_Internal_Rela *);
  1198.  
  1199.   /* This function, if defined, removes information about discarded functions
  1200.      from other sections which mention them.  */
  1201.   bfd_boolean (*elf_backend_discard_info)
  1202.     (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
  1203.  
  1204.   /* This function, if defined, signals that the function above has removed
  1205.      the discarded relocations for this section.  */
  1206.   bfd_boolean (*elf_backend_ignore_discarded_relocs)
  1207.     (asection *);
  1208.  
  1209.   /* What to do when ld finds relocations against symbols defined in
  1210.      discarded sections.  */
  1211.   unsigned int (*action_discarded)
  1212.     (asection *);
  1213.  
  1214.   /* This function returns the width of FDE pointers in bytes, or 0 if
  1215.      that can't be determined for some reason.  The default definition
  1216.      goes by the bfd's EI_CLASS.  */
  1217.   unsigned int (*elf_backend_eh_frame_address_size)
  1218.     (bfd *, asection *);
  1219.  
  1220.   /* These functions tell elf-eh-frame whether to attempt to turn
  1221.      absolute or lsda encodings into pc-relative ones.  The default
  1222.      definition enables these transformations.  */
  1223.   bfd_boolean (*elf_backend_can_make_relative_eh_frame)
  1224.      (bfd *, struct bfd_link_info *, asection *);
  1225.   bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
  1226.      (bfd *, struct bfd_link_info *, asection *);
  1227.  
  1228.   /* This function returns an encoding after computing the encoded
  1229.      value (and storing it in ENCODED) for the given OFFSET into OSEC,
  1230.      to be stored in at LOC_OFFSET into the LOC_SEC input section.
  1231.      The default definition chooses a 32-bit PC-relative encoding.  */
  1232.   bfd_byte (*elf_backend_encode_eh_address)
  1233.      (bfd *abfd, struct bfd_link_info *info,
  1234.       asection *osec, bfd_vma offset,
  1235.       asection *loc_sec, bfd_vma loc_offset,
  1236.       bfd_vma *encoded);
  1237.  
  1238.   /* This function, if defined, may write out the given section.
  1239.      Returns TRUE if it did so and FALSE if the caller should.  */
  1240.   bfd_boolean (*elf_backend_write_section)
  1241.     (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
  1242.  
  1243.   /* The level of IRIX compatibility we're striving for.
  1244.      MIPS ELF specific function.  */
  1245.   irix_compat_t (*elf_backend_mips_irix_compat)
  1246.     (bfd *);
  1247.  
  1248.   reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
  1249.     (unsigned int, bfd_boolean);
  1250.  
  1251.   /* The swapping table to use when dealing with ECOFF information.
  1252.      Used for the MIPS ELF .mdebug section.  */
  1253.   const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
  1254.  
  1255.   /* This function implements `bfd_elf_bfd_from_remote_memory';
  1256.      see elf.c, elfcode.h.  */
  1257.   bfd *(*elf_backend_bfd_from_remote_memory)
  1258.     (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
  1259.       int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr,
  1260.                                  bfd_size_type len));
  1261.  
  1262.   /* This function is used by `_bfd_elf_get_synthetic_symtab';
  1263.      see elf.c.  */
  1264.   bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
  1265.  
  1266.   /* Is symbol defined in common section?  */
  1267.   bfd_boolean (*common_definition) (Elf_Internal_Sym *);
  1268.  
  1269.   /* Return a common section index for section.  */
  1270.   unsigned int (*common_section_index) (asection *);
  1271.  
  1272.   /* Return a common section for section.  */
  1273.   asection *(*common_section) (asection *);
  1274.  
  1275.   /* Return TRUE if we can merge 2 definitions.  */
  1276.   bfd_boolean (*merge_symbol) (struct elf_link_hash_entry *,
  1277.                                const Elf_Internal_Sym *, asection **,
  1278.                                bfd_boolean, bfd_boolean,
  1279.                                bfd *, const asection *);
  1280.  
  1281.   /* Return TRUE if symbol should be hashed in the `.gnu.hash' section.  */
  1282.   bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
  1283.  
  1284.   /* Return TRUE if type is a function symbol type.  */
  1285.   bfd_boolean (*is_function_type) (unsigned int type);
  1286.  
  1287.   /* If the ELF symbol SYM might be a function in SEC, return the
  1288.      function size and set *CODE_OFF to the function's entry point,
  1289.      otherwise return zero.  */
  1290.   bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec,
  1291.                                        bfd_vma *code_off);
  1292.  
  1293.   /* Return the section which RELOC_SEC applies to.  */
  1294.   asection *(*get_reloc_section) (asection *reloc_sec);
  1295.  
  1296.   /* Used to handle bad SHF_LINK_ORDER input.  */
  1297.   bfd_error_handler_type link_order_error_handler;
  1298.  
  1299.   /* Name of the PLT relocation section.  */
  1300.   const char *relplt_name;
  1301.  
  1302.   /* Alternate EM_xxxx machine codes for this backend.  */
  1303.   int elf_machine_alt1;
  1304.   int elf_machine_alt2;
  1305.  
  1306.   const struct elf_size_info *s;
  1307.  
  1308.   /* An array of target specific special sections.  */
  1309.   const struct bfd_elf_special_section *special_sections;
  1310.  
  1311.   /* The size in bytes of the header for the GOT.  This includes the
  1312.      so-called reserved entries on some systems.  */
  1313.   bfd_vma got_header_size;
  1314.  
  1315.   /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
  1316.      otherwise by the local symbol with index SYMNDX in IBFD.  */
  1317.   bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
  1318.                            struct elf_link_hash_entry *h,
  1319.                            bfd *ibfd, unsigned long symndx);
  1320.  
  1321.   /* The vendor name to use for a processor-standard attributes section.  */
  1322.   const char *obj_attrs_vendor;
  1323.  
  1324.   /* The section name to use for a processor-standard attributes section.  */
  1325.   const char *obj_attrs_section;
  1326.  
  1327.   /* Return 1, 2 or 3 to indicate what type of arguments a
  1328.      processor-specific tag takes.  */
  1329.   int (*obj_attrs_arg_type) (int);
  1330.  
  1331.   /* The section type to use for an attributes section.  */
  1332.   unsigned int obj_attrs_section_type;
  1333.  
  1334.   /* This function determines the order in which any attributes are
  1335.      written.  It must be defined for input in the range
  1336.      LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range
  1337.      is used in order to make unity easy).  The returned value is the
  1338.      actual tag number to place in the input position.  */
  1339.   int (*obj_attrs_order) (int);
  1340.  
  1341.   /* Handle merging unknown attributes; either warn and return TRUE,
  1342.      or give an error and return FALSE.  */
  1343.   bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int);
  1344.  
  1345.   /* Encoding used for compact EH tables.  */
  1346.   int (*compact_eh_encoding) (struct bfd_link_info *);
  1347.  
  1348.   /* Opcode representing no unwind.  */
  1349.   int (*cant_unwind_opcode) (struct bfd_link_info *);
  1350.  
  1351.   /* This is non-zero if static TLS segments require a special alignment.  */
  1352.   unsigned static_tls_alignment;
  1353.  
  1354.   /* Alignment for the PT_GNU_STACK segment. */
  1355.   unsigned stack_align;
  1356.  
  1357.   /* This is TRUE if the linker should act like collect and gather
  1358.      global constructors and destructors by name.  This is TRUE for
  1359.      MIPS ELF because the Irix 5 tools can not handle the .init
  1360.      section.  */
  1361.   unsigned collect : 1;
  1362.  
  1363.   /* This is TRUE if the linker should ignore changes to the type of a
  1364.      symbol.  This is TRUE for MIPS ELF because some Irix 5 objects
  1365.      record undefined functions as STT_OBJECT although the definitions
  1366.      are STT_FUNC.  */
  1367.   unsigned type_change_ok : 1;
  1368.  
  1369.   /* Whether the backend may use REL relocations.  (Some backends use
  1370.      both REL and RELA relocations, and this flag is set for those
  1371.      backends.)  */
  1372.   unsigned may_use_rel_p : 1;
  1373.  
  1374.   /* Whether the backend may use RELA relocations.  (Some backends use
  1375.      both REL and RELA relocations, and this flag is set for those
  1376.      backends.)  */
  1377.   unsigned may_use_rela_p : 1;
  1378.  
  1379.   /* Whether the default relocation type is RELA.  If a backend with
  1380.      this flag set wants REL relocations for a particular section,
  1381.      it must note that explicitly.  Similarly, if this flag is clear,
  1382.      and the backend wants RELA relocations for a particular
  1383.      section.  */
  1384.   unsigned default_use_rela_p : 1;
  1385.  
  1386.   /* True if PLT and copy relocations should be RELA by default.  */
  1387.   unsigned rela_plts_and_copies_p : 1;
  1388.  
  1389.   /* Set if RELA relocations for a relocatable link can be handled by
  1390.      generic code.  Backends that set this flag need do nothing in the
  1391.      backend relocate_section routine for relocatable linking.  */
  1392.   unsigned rela_normal : 1;
  1393.  
  1394.   /* TRUE if addresses "naturally" sign extend.  This is used when
  1395.      swapping in from Elf32 when BFD64.  */
  1396.   unsigned sign_extend_vma : 1;
  1397.  
  1398.   unsigned want_got_plt : 1;
  1399.   unsigned plt_readonly : 1;
  1400.   unsigned want_plt_sym : 1;
  1401.   unsigned plt_not_loaded : 1;
  1402.   unsigned plt_alignment : 4;
  1403.   unsigned can_gc_sections : 1;
  1404.   unsigned can_refcount : 1;
  1405.   unsigned want_got_sym : 1;
  1406.   unsigned want_dynbss : 1;
  1407.  
  1408.   /* Targets which do not support physical addressing often require
  1409.      that the p_paddr field in the section header to be set to zero.
  1410.      This field indicates whether this behavior is required.  */
  1411.   unsigned want_p_paddr_set_to_zero : 1;
  1412.  
  1413.   /* True if an object file lacking a .note.GNU-stack section
  1414.      should be assumed to be requesting exec stack.  At least one
  1415.      other file in the link needs to have a .note.GNU-stack section
  1416.      for a PT_GNU_STACK segment to be created.  */
  1417.   unsigned default_execstack : 1;
  1418.  
  1419.   /* True if elf_section_data(sec)->this_hdr.contents is sec->rawsize
  1420.      in length rather than sec->size in length, if sec->rawsize is
  1421.      non-zero and smaller than sec->size.  */
  1422.   unsigned caches_rawsize : 1;
  1423.  
  1424.   /* Address of protected data defined in the shared library may be
  1425.      external, i.e., due to copy relocation.   */
  1426.   unsigned extern_protected_data : 1;
  1427. };
  1428.  
  1429. /* Information about reloc sections associated with a bfd_elf_section_data
  1430.    structure.  */
  1431. struct bfd_elf_section_reloc_data
  1432. {
  1433.   /* The ELF header for the reloc section associated with this
  1434.      section, if any.  */
  1435.   Elf_Internal_Shdr *hdr;
  1436.   /* The number of relocations currently assigned to HDR.  */
  1437.   unsigned int count;
  1438.   /* The ELF section number of the reloc section.  Only used for an
  1439.      output file.  */
  1440.   int idx;
  1441.   /* Used by the backend linker to store the symbol hash table entries
  1442.      associated with relocs against global symbols.  */
  1443.   struct elf_link_hash_entry **hashes;
  1444. };
  1445.  
  1446. /* Information stored for each BFD section in an ELF file.  This
  1447.    structure is allocated by elf_new_section_hook.  */
  1448.  
  1449. struct bfd_elf_section_data
  1450. {
  1451.   /* The ELF header for this section.  */
  1452.   Elf_Internal_Shdr this_hdr;
  1453.  
  1454.   /* INPUT_SECTION_FLAGS if specified in the linker script.  */
  1455.   struct flag_info *section_flag_info;
  1456.  
  1457.   /* Information about the REL and RELA reloc sections associated
  1458.      with this section, if any.  */
  1459.   struct bfd_elf_section_reloc_data rel, rela;
  1460.  
  1461.   /* The ELF section number of this section.  */
  1462.   int this_idx;
  1463.  
  1464.   /* Used by the backend linker when generating a shared library to
  1465.      record the dynamic symbol index for a section symbol
  1466.      corresponding to this section.  A value of 0 means that there is
  1467.      no dynamic symbol for this section.  */
  1468.   int dynindx;
  1469.  
  1470.   /* A pointer to the linked-to section for SHF_LINK_ORDER.  */
  1471.   asection *linked_to;
  1472.  
  1473.   /* A pointer to the swapped relocs.  If the section uses REL relocs,
  1474.      rather than RELA, all the r_addend fields will be zero.  This
  1475.      pointer may be NULL.  It is used by the backend linker.  */
  1476.   Elf_Internal_Rela *relocs;
  1477.  
  1478.   /* A pointer to a linked list tracking dynamic relocs copied for
  1479.      local symbols.  */
  1480.   void *local_dynrel;
  1481.  
  1482.   /* A pointer to the bfd section used for dynamic relocs.  */
  1483.   asection *sreloc;
  1484.  
  1485.   union {
  1486.     /* Group name, if this section is a member of a group.  */
  1487.     const char *name;
  1488.  
  1489.     /* Group signature sym, if this is the SHT_GROUP section.  */
  1490.     struct bfd_symbol *id;
  1491.   } group;
  1492.  
  1493.   /* For a member of a group, points to the SHT_GROUP section.
  1494.      NULL for the SHT_GROUP section itself and non-group sections.  */
  1495.   asection *sec_group;
  1496.  
  1497.   /* A linked list of member sections in the group.  Circular when used by
  1498.      the linker.  For the SHT_GROUP section, points at first member.  */
  1499.   asection *next_in_group;
  1500.  
  1501.   /* The FDEs associated with this section.  The u.fde.next_in_section
  1502.      field acts as a chain pointer.  */
  1503.   struct eh_cie_fde *fde_list;
  1504.  
  1505.   /* Link from a text section to its .eh_frame_entry section.  */
  1506.   asection *eh_frame_entry;
  1507.  
  1508.   /* A pointer used for various section optimizations.  */
  1509.   void *sec_info;
  1510. };
  1511.  
  1512. #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
  1513. #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
  1514. #define elf_section_type(sec)   (elf_section_data(sec)->this_hdr.sh_type)
  1515. #define elf_section_flags(sec)  (elf_section_data(sec)->this_hdr.sh_flags)
  1516. #define elf_group_name(sec)     (elf_section_data(sec)->group.name)
  1517. #define elf_group_id(sec)       (elf_section_data(sec)->group.id)
  1518. #define elf_next_in_group(sec)  (elf_section_data(sec)->next_in_group)
  1519. #define elf_fde_list(sec)       (elf_section_data(sec)->fde_list)
  1520. #define elf_sec_group(sec)      (elf_section_data(sec)->sec_group)
  1521. #define elf_section_eh_frame_entry(sec) (elf_section_data(sec)->eh_frame_entry)
  1522.  
  1523. #define xvec_get_elf_backend_data(xvec) \
  1524.   ((const struct elf_backend_data *) (xvec)->backend_data)
  1525.  
  1526. #define get_elf_backend_data(abfd) \
  1527.    xvec_get_elf_backend_data ((abfd)->xvec)
  1528.  
  1529. /* The least object attributes (within an attributes subsection) known
  1530.    for any target.  Some code assumes that the value 0 is not used and
  1531.    the field for that attribute can instead be used as a marker to
  1532.    indicate that attributes have been initialized.  */
  1533. #define LEAST_KNOWN_OBJ_ATTRIBUTE 2
  1534.  
  1535. /* The maximum number of known object attributes for any target.  */
  1536. #define NUM_KNOWN_OBJ_ATTRIBUTES 71
  1537.  
  1538. /* The value of an object attribute.  The type indicates whether the attribute
  1539.    holds and integer, a string, or both.  It can also indicate that there can
  1540.    be no default (i.e. all values must be written to file, even zero).  */
  1541.  
  1542. typedef struct obj_attribute
  1543. {
  1544. #define ATTR_TYPE_FLAG_INT_VAL    (1 << 0)
  1545. #define ATTR_TYPE_FLAG_STR_VAL    (1 << 1)
  1546. #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
  1547.  
  1548. #define ATTR_TYPE_HAS_INT_VAL(TYPE)     ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
  1549. #define ATTR_TYPE_HAS_STR_VAL(TYPE)     ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
  1550. #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE)  ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
  1551.  
  1552.   int type;
  1553.   unsigned int i;
  1554.   char *s;
  1555. } obj_attribute;
  1556.  
  1557. typedef struct obj_attribute_list
  1558. {
  1559.   struct obj_attribute_list *next;
  1560.   unsigned int tag;
  1561.   obj_attribute attr;
  1562. } obj_attribute_list;
  1563.  
  1564. /* Object attributes may either be defined by the processor ABI, index
  1565.    OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
  1566.    (and possibly also processor-specific), index OBJ_ATTR_GNU.  */
  1567. #define OBJ_ATTR_PROC 0
  1568. #define OBJ_ATTR_GNU 1
  1569. #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
  1570. #define OBJ_ATTR_LAST OBJ_ATTR_GNU
  1571.  
  1572. /* The following object attribute tags are taken as generic, for all
  1573.    targets and for "gnu" where there is no target standard.  */
  1574. enum
  1575. {
  1576.   Tag_NULL = 0,
  1577.   Tag_File = 1,
  1578.   Tag_Section = 2,
  1579.   Tag_Symbol = 3,
  1580.   Tag_compatibility = 32
  1581. };
  1582.  
  1583. /* The following struct stores information about every SystemTap section
  1584.    found in the object file.  */
  1585. struct sdt_note
  1586. {
  1587.   struct sdt_note *next;
  1588.   bfd_size_type size;
  1589.   bfd_byte data[1];
  1590. };
  1591.  
  1592. /* tdata information grabbed from an elf core file.  */
  1593. struct core_elf_obj_tdata
  1594. {
  1595.   int signal;
  1596.   int pid;
  1597.   int lwpid;
  1598.   char* program;
  1599.   char* command;
  1600. };
  1601.  
  1602. /* Extra tdata information held for output ELF BFDs.  */
  1603. struct output_elf_obj_tdata
  1604. {
  1605.   struct elf_segment_map *seg_map;
  1606.   struct elf_strtab_hash *strtab_ptr;
  1607.  
  1608.   /* STT_SECTION symbols for each section */
  1609.   asymbol **section_syms;
  1610.  
  1611.   /* Used to determine if PT_GNU_EH_FRAME segment header should be
  1612.      created.  */
  1613.   asection *eh_frame_hdr;
  1614.  
  1615.   /* NT_GNU_BUILD_ID note type info.  */
  1616.   struct
  1617.   {
  1618.     bfd_boolean (*after_write_object_contents) (bfd *);
  1619.     const char *style;
  1620.     asection *sec;
  1621.   } build_id;
  1622.  
  1623.   /* Records the result of `get_program_header_size'.  */
  1624.   bfd_size_type program_header_size;
  1625.  
  1626.   /* Used when laying out sections.  */
  1627.   file_ptr next_file_pos;
  1628.  
  1629.   int num_section_syms;
  1630.   unsigned int shstrtab_section, strtab_section;
  1631.  
  1632.   /* Segment flags for the PT_GNU_STACK segment.  */
  1633.   unsigned int stack_flags;
  1634.  
  1635.   /* This is set to TRUE if the object was created by the backend
  1636.      linker.  */
  1637.   bfd_boolean linker;
  1638.  
  1639.   /* Used to determine if the e_flags field has been initialized */
  1640.   bfd_boolean flags_init;
  1641. };
  1642.  
  1643. /* Indicate if the bfd contains symbols that have the STT_GNU_IFUNC
  1644.    symbol type or STB_GNU_UNIQUE binding.  Used to set the osabi
  1645.    field in the ELF header structure.  */
  1646. enum elf_gnu_symbols
  1647.   {
  1648.     elf_gnu_symbol_none = 0,
  1649.     elf_gnu_symbol_any = 1 << 0,
  1650.     elf_gnu_symbol_ifunc = (elf_gnu_symbol_any | 1 << 1),
  1651.     elf_gnu_symbol_unique = (elf_gnu_symbol_any | 1 << 2),
  1652.     elf_gnu_symbol_all = (elf_gnu_symbol_ifunc | elf_gnu_symbol_unique)
  1653.   };
  1654.  
  1655. typedef struct elf_section_list
  1656. {
  1657.   Elf_Internal_Shdr          hdr;
  1658.   unsigned int               ndx;
  1659.   struct elf_section_list *  next;
  1660. } elf_section_list;
  1661.  
  1662.    
  1663. /* Some private data is stashed away for future use using the tdata pointer
  1664.    in the bfd structure.  */
  1665.  
  1666. struct elf_obj_tdata
  1667. {
  1668.   Elf_Internal_Ehdr elf_header[1];      /* Actual data, but ref like ptr */
  1669.   Elf_Internal_Shdr **elf_sect_ptr;
  1670.   Elf_Internal_Phdr *phdr;
  1671.   Elf_Internal_Shdr symtab_hdr;
  1672.   Elf_Internal_Shdr shstrtab_hdr;
  1673.   Elf_Internal_Shdr strtab_hdr;
  1674.   Elf_Internal_Shdr dynsymtab_hdr;
  1675.   Elf_Internal_Shdr dynstrtab_hdr;
  1676.   Elf_Internal_Shdr dynversym_hdr;
  1677.   Elf_Internal_Shdr dynverref_hdr;
  1678.   Elf_Internal_Shdr dynverdef_hdr;
  1679.   elf_section_list * symtab_shndx_list;
  1680.   bfd_vma gp;                           /* The gp value */
  1681.   unsigned int gp_size;                 /* The gp size */
  1682.   unsigned int num_elf_sections;        /* elf_sect_ptr size */
  1683.  
  1684.   /* A mapping from external symbols to entries in the linker hash
  1685.      table, used when linking.  This is indexed by the symbol index
  1686.      minus the sh_info field of the symbol table header.  */
  1687.   struct elf_link_hash_entry **sym_hashes;
  1688.  
  1689.   /* Track usage and final offsets of GOT entries for local symbols.
  1690.      This array is indexed by symbol index.  Elements are used
  1691.      identically to "got" in struct elf_link_hash_entry.  */
  1692.   union
  1693.     {
  1694.       bfd_signed_vma *refcounts;
  1695.       bfd_vma *offsets;
  1696.       struct got_entry **ents;
  1697.     } local_got;
  1698.  
  1699.   /* The linker ELF emulation code needs to let the backend ELF linker
  1700.      know what filename should be used for a dynamic object if the
  1701.      dynamic object is found using a search.  The emulation code then
  1702.      sometimes needs to know what name was actually used.  Until the
  1703.      file has been added to the linker symbol table, this field holds
  1704.      the name the linker wants.  After it has been added, it holds the
  1705.      name actually used, which will be the DT_SONAME entry if there is
  1706.      one.  */
  1707.   const char *dt_name;
  1708.  
  1709.   /* The linker emulation needs to know what audit libs
  1710.      are used by a dynamic object.  */
  1711.   const char *dt_audit;
  1712.  
  1713.   /* Used by find_nearest_line entry point.  */
  1714.   void *line_info;
  1715.  
  1716.   /* A place to stash dwarf1 info for this bfd.  */
  1717.   struct dwarf1_debug *dwarf1_find_line_info;
  1718.  
  1719.   /* A place to stash dwarf2 info for this bfd.  */
  1720.   void *dwarf2_find_line_info;
  1721.  
  1722.   /* Stash away info for yet another find line/function variant.  */
  1723.   void *elf_find_function_cache;
  1724.  
  1725.   /* Number of symbol version definitions we are about to emit.  */
  1726.   unsigned int cverdefs;
  1727.  
  1728.   /* Number of symbol version references we are about to emit.  */
  1729.   unsigned int cverrefs;
  1730.  
  1731.   /* Symbol version definitions in external objects.  */
  1732.   Elf_Internal_Verdef *verdef;
  1733.  
  1734.   /* Symbol version references to external objects.  */
  1735.   Elf_Internal_Verneed *verref;
  1736.  
  1737.   /* A pointer to the .eh_frame section.  */
  1738.   asection *eh_frame_section;
  1739.  
  1740.   /* Symbol buffer.  */
  1741.   void *symbuf;
  1742.  
  1743.   obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
  1744.   obj_attribute_list *other_obj_attributes[2];
  1745.  
  1746.   /* Linked-list containing information about every Systemtap section
  1747.      found in the object file.  Each section corresponds to one entry
  1748.      in the list.  */
  1749.   struct sdt_note *sdt_note_head;
  1750.  
  1751.   Elf_Internal_Shdr **group_sect_ptr;
  1752.   int num_group;
  1753.  
  1754.   unsigned int symtab_section, dynsymtab_section;
  1755.   unsigned int dynversym_section, dynverdef_section, dynverref_section;
  1756.  
  1757.   /* An identifier used to distinguish different target
  1758.      specific extensions to this structure.  */
  1759.   enum elf_target_id object_id;
  1760.  
  1761.   /* Whether a dyanmic object was specified normally on the linker
  1762.      command line, or was specified when --as-needed was in effect,
  1763.      or was found via a DT_NEEDED entry.  */
  1764.   enum dynamic_lib_link_class dyn_lib_class;
  1765.  
  1766.   /* Irix 5 often screws up the symbol table, sorting local symbols
  1767.      after global symbols.  This flag is set if the symbol table in
  1768.      this BFD appears to be screwed up.  If it is, we ignore the
  1769.      sh_info field in the symbol table header, and always read all the
  1770.      symbols.  */
  1771.   bfd_boolean bad_symtab;
  1772.  
  1773.   enum elf_gnu_symbols has_gnu_symbols;
  1774.  
  1775.   /* Information grabbed from an elf core file.  */
  1776.   struct core_elf_obj_tdata *core;
  1777.  
  1778.   /* More information held for output ELF BFDs.  */
  1779.   struct output_elf_obj_tdata *o;
  1780. };
  1781.  
  1782. #define elf_tdata(bfd)          ((bfd) -> tdata.elf_obj_data)
  1783.  
  1784. #define elf_object_id(bfd)      (elf_tdata(bfd) -> object_id)
  1785. #define elf_program_header_size(bfd) (elf_tdata(bfd) -> o->program_header_size)
  1786. #define elf_elfheader(bfd)      (elf_tdata(bfd) -> elf_header)
  1787. #define elf_elfsections(bfd)    (elf_tdata(bfd) -> elf_sect_ptr)
  1788. #define elf_numsections(bfd)    (elf_tdata(bfd) -> num_elf_sections)
  1789. #define elf_seg_map(bfd)        (elf_tdata(bfd) -> o->seg_map)
  1790. #define elf_next_file_pos(bfd)  (elf_tdata(bfd) -> o->next_file_pos)
  1791. #define elf_eh_frame_hdr(bfd)   (elf_tdata(bfd) -> o->eh_frame_hdr)
  1792. #define elf_linker(bfd)         (elf_tdata(bfd) -> o->linker)
  1793. #define elf_stack_flags(bfd)    (elf_tdata(bfd) -> o->stack_flags)
  1794. #define elf_shstrtab(bfd)       (elf_tdata(bfd) -> o->strtab_ptr)
  1795. #define elf_onesymtab(bfd)      (elf_tdata(bfd) -> symtab_section)
  1796. #define elf_symtab_shndx_list(bfd)      (elf_tdata(bfd) -> symtab_shndx_list)
  1797. #define elf_strtab_sec(bfd)     (elf_tdata(bfd) -> o->strtab_section)
  1798. #define elf_shstrtab_sec(bfd)   (elf_tdata(bfd) -> o->shstrtab_section)
  1799. #define elf_symtab_hdr(bfd)     (elf_tdata(bfd) -> symtab_hdr)
  1800. #define elf_dynsymtab(bfd)      (elf_tdata(bfd) -> dynsymtab_section)
  1801. #define elf_dynversym(bfd)      (elf_tdata(bfd) -> dynversym_section)
  1802. #define elf_dynverdef(bfd)      (elf_tdata(bfd) -> dynverdef_section)
  1803. #define elf_dynverref(bfd)      (elf_tdata(bfd) -> dynverref_section)
  1804. #define elf_eh_frame_section(bfd) \
  1805.                                 (elf_tdata(bfd) -> eh_frame_section)
  1806. #define elf_section_syms(bfd)   (elf_tdata(bfd) -> o->section_syms)
  1807. #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> o->num_section_syms)
  1808. #define core_prpsinfo(bfd)      (elf_tdata(bfd) -> prpsinfo)
  1809. #define core_prstatus(bfd)      (elf_tdata(bfd) -> prstatus)
  1810. #define elf_gp(bfd)             (elf_tdata(bfd) -> gp)
  1811. #define elf_gp_size(bfd)        (elf_tdata(bfd) -> gp_size)
  1812. #define elf_sym_hashes(bfd)     (elf_tdata(bfd) -> sym_hashes)
  1813. #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
  1814. #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
  1815. #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
  1816. #define elf_dt_name(bfd)        (elf_tdata(bfd) -> dt_name)
  1817. #define elf_dt_audit(bfd)       (elf_tdata(bfd) -> dt_audit)
  1818. #define elf_dyn_lib_class(bfd)  (elf_tdata(bfd) -> dyn_lib_class)
  1819. #define elf_bad_symtab(bfd)     (elf_tdata(bfd) -> bad_symtab)
  1820. #define elf_flags_init(bfd)     (elf_tdata(bfd) -> o->flags_init)
  1821. #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
  1822. #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
  1823. #define elf_known_obj_attributes_proc(bfd) \
  1824.   (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
  1825. #define elf_other_obj_attributes_proc(bfd) \
  1826.   (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
  1827. extern void _bfd_elf_swap_verdef_in
  1828.   (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
  1829. extern void _bfd_elf_swap_verdef_out
  1830.   (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
  1831. extern void _bfd_elf_swap_verdaux_in
  1832.   (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
  1833. extern void _bfd_elf_swap_verdaux_out
  1834.   (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
  1835. extern void _bfd_elf_swap_verneed_in
  1836.   (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
  1837. extern void _bfd_elf_swap_verneed_out
  1838.   (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
  1839. extern void _bfd_elf_swap_vernaux_in
  1840.   (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
  1841. extern void _bfd_elf_swap_vernaux_out
  1842.   (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
  1843. extern void _bfd_elf_swap_versym_in
  1844.   (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
  1845. extern void _bfd_elf_swap_versym_out
  1846.   (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
  1847.  
  1848. extern unsigned int _bfd_elf_section_from_bfd_section
  1849.   (bfd *, asection *);
  1850. extern char *bfd_elf_string_from_elf_section
  1851.   (bfd *, unsigned, unsigned);
  1852. extern Elf_Internal_Sym *bfd_elf_get_elf_syms
  1853.   (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
  1854.    Elf_External_Sym_Shndx *);
  1855. extern const char *bfd_elf_sym_name
  1856.   (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
  1857.  
  1858. extern bfd_boolean _bfd_elf_copy_private_bfd_data
  1859.   (bfd *, bfd *);
  1860. extern bfd_boolean _bfd_elf_print_private_bfd_data
  1861.   (bfd *, void *);
  1862. const char * _bfd_elf_get_symbol_version_string
  1863.   (bfd *, asymbol *, bfd_boolean *);
  1864. extern void bfd_elf_print_symbol
  1865.   (bfd *, void *, asymbol *, bfd_print_symbol_type);
  1866.  
  1867. extern unsigned int _bfd_elf_eh_frame_address_size
  1868.   (bfd *, asection *);
  1869. extern bfd_byte _bfd_elf_encode_eh_address
  1870.   (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
  1871.    asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
  1872. extern bfd_boolean _bfd_elf_can_make_relative
  1873.   (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
  1874.  
  1875. extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
  1876.   (const struct bfd_link_info *, const asection *,
  1877.    const Elf_Internal_Rela *);
  1878. extern bfd_vma _bfd_elf_rela_local_sym
  1879.   (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
  1880. extern bfd_vma _bfd_elf_rel_local_sym
  1881.   (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
  1882. extern bfd_vma _bfd_elf_section_offset
  1883.   (bfd *, struct bfd_link_info *, asection *, bfd_vma);
  1884.  
  1885. extern unsigned long bfd_elf_hash
  1886.   (const char *);
  1887. extern unsigned long bfd_elf_gnu_hash
  1888.   (const char *);
  1889.  
  1890. extern bfd_reloc_status_type bfd_elf_generic_reloc
  1891.   (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
  1892. extern bfd_boolean bfd_elf_allocate_object
  1893.   (bfd *, size_t, enum elf_target_id);
  1894. extern bfd_boolean bfd_elf_make_object
  1895.   (bfd *);
  1896. extern bfd_boolean bfd_elf_mkcorefile
  1897.   (bfd *);
  1898. extern bfd_boolean _bfd_elf_make_section_from_shdr
  1899.   (bfd *, Elf_Internal_Shdr *, const char *, int);
  1900. extern bfd_boolean _bfd_elf_make_section_from_phdr
  1901.   (bfd *, Elf_Internal_Phdr *, int, const char *);
  1902. extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
  1903.   (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
  1904. extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
  1905.   (bfd *);
  1906. extern void _bfd_elf_link_hash_table_free
  1907.   (bfd *);
  1908. extern void _bfd_elf_link_hash_copy_indirect
  1909.   (struct bfd_link_info *, struct elf_link_hash_entry *,
  1910.    struct elf_link_hash_entry *);
  1911. extern void _bfd_elf_link_hash_hide_symbol
  1912.   (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
  1913. extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
  1914.   (struct bfd_link_info *, struct elf_link_hash_entry *);
  1915. extern bfd_boolean _bfd_elf_link_hash_table_init
  1916.   (struct elf_link_hash_table *, bfd *,
  1917.    struct bfd_hash_entry *(*)
  1918.      (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
  1919.    unsigned int, enum elf_target_id);
  1920. extern bfd_boolean _bfd_elf_slurp_version_tables
  1921.   (bfd *, bfd_boolean);
  1922. extern bfd_boolean _bfd_elf_merge_sections
  1923.   (bfd *, struct bfd_link_info *);
  1924. extern bfd_boolean _bfd_elf_match_sections_by_type
  1925.   (bfd *, const asection *, bfd *, const asection *);
  1926. extern bfd_boolean bfd_elf_is_group_section
  1927.   (bfd *, const struct bfd_section *);
  1928. extern bfd_boolean _bfd_elf_section_already_linked
  1929.   (bfd *, asection *, struct bfd_link_info *);
  1930. extern void bfd_elf_set_group_contents
  1931.   (bfd *, asection *, void *);
  1932. extern asection *_bfd_elf_check_kept_section
  1933.   (asection *, struct bfd_link_info *);
  1934. #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms
  1935. extern void _bfd_elf_copy_link_hash_symbol_type
  1936.   (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
  1937. extern bfd_boolean _bfd_elf_size_group_sections
  1938.   (struct bfd_link_info *);
  1939. extern bfd_boolean _bfd_elf_fixup_group_sections
  1940. (bfd *, asection *);
  1941. extern bfd_boolean _bfd_elf_copy_private_header_data
  1942.   (bfd *, bfd *);
  1943. extern bfd_boolean _bfd_elf_copy_private_symbol_data
  1944.   (bfd *, asymbol *, bfd *, asymbol *);
  1945. #define _bfd_generic_init_private_section_data \
  1946.   _bfd_elf_init_private_section_data
  1947. extern bfd_boolean _bfd_elf_init_private_section_data
  1948.   (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
  1949. extern bfd_boolean _bfd_elf_copy_private_section_data
  1950.   (bfd *, asection *, bfd *, asection *);
  1951. extern bfd_boolean _bfd_elf_write_object_contents
  1952.   (bfd *);
  1953. extern bfd_boolean _bfd_elf_write_corefile_contents
  1954.   (bfd *);
  1955. extern bfd_boolean _bfd_elf_set_section_contents
  1956.   (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
  1957. extern long _bfd_elf_get_symtab_upper_bound
  1958.   (bfd *);
  1959. extern long _bfd_elf_canonicalize_symtab
  1960.   (bfd *, asymbol **);
  1961. extern long _bfd_elf_get_dynamic_symtab_upper_bound
  1962.   (bfd *);
  1963. extern long _bfd_elf_canonicalize_dynamic_symtab
  1964.   (bfd *, asymbol **);
  1965. extern long _bfd_elf_get_synthetic_symtab
  1966.   (bfd *, long, asymbol **, long, asymbol **, asymbol **);
  1967. extern long _bfd_elf_get_reloc_upper_bound
  1968.   (bfd *, sec_ptr);
  1969. extern long _bfd_elf_canonicalize_reloc
  1970.   (bfd *, sec_ptr, arelent **, asymbol **);
  1971. extern asection * _bfd_elf_get_dynamic_reloc_section
  1972.   (bfd *, asection *, bfd_boolean);
  1973. extern asection * _bfd_elf_make_dynamic_reloc_section
  1974.   (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
  1975. extern long _bfd_elf_get_dynamic_reloc_upper_bound
  1976.   (bfd *);
  1977. extern long _bfd_elf_canonicalize_dynamic_reloc
  1978.   (bfd *, arelent **, asymbol **);
  1979. extern asymbol *_bfd_elf_make_empty_symbol
  1980.   (bfd *);
  1981. extern void _bfd_elf_get_symbol_info
  1982.   (bfd *, asymbol *, symbol_info *);
  1983. extern bfd_boolean _bfd_elf_is_local_label_name
  1984.   (bfd *, const char *);
  1985. extern alent *_bfd_elf_get_lineno
  1986.   (bfd *, asymbol *);
  1987. extern bfd_boolean _bfd_elf_set_arch_mach
  1988.   (bfd *, enum bfd_architecture, unsigned long);
  1989. extern bfd_boolean _bfd_elf_find_nearest_line
  1990.   (bfd *, asymbol **, asection *, bfd_vma,
  1991.    const char **, const char **, unsigned int *, unsigned int *);
  1992. extern bfd_boolean _bfd_elf_find_line
  1993.   (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
  1994. extern bfd_boolean _bfd_elf_find_inliner_info
  1995.   (bfd *, const char **, const char **, unsigned int *);
  1996. extern asymbol *_bfd_elf_find_function
  1997.   (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **);
  1998. #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
  1999. #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
  2000. extern int _bfd_elf_sizeof_headers
  2001.   (bfd *, struct bfd_link_info *);
  2002. extern bfd_boolean _bfd_elf_new_section_hook
  2003.   (bfd *, asection *);
  2004. extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
  2005.   (const char *, const struct bfd_elf_special_section *, unsigned int);
  2006. extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
  2007.   (bfd *, asection *);
  2008.  
  2009. /* If the target doesn't have reloc handling written yet:  */
  2010. extern void _bfd_elf_no_info_to_howto
  2011.   (bfd *, arelent *, Elf_Internal_Rela *);
  2012.  
  2013. extern bfd_boolean bfd_section_from_shdr
  2014.   (bfd *, unsigned int shindex);
  2015. extern bfd_boolean bfd_section_from_phdr
  2016.   (bfd *, Elf_Internal_Phdr *, int);
  2017.  
  2018. extern int _bfd_elf_symbol_from_bfd_symbol
  2019.   (bfd *, asymbol **);
  2020.  
  2021. extern Elf_Internal_Sym *bfd_sym_from_r_symndx
  2022.   (struct sym_cache *, bfd *, unsigned long);
  2023. extern asection *bfd_section_from_elf_index
  2024.   (bfd *, unsigned int);
  2025.  
  2026. extern struct elf_strtab_hash * _bfd_elf_strtab_init
  2027.   (void);
  2028. extern void _bfd_elf_strtab_free
  2029.   (struct elf_strtab_hash *);
  2030. extern bfd_size_type _bfd_elf_strtab_add
  2031.   (struct elf_strtab_hash *, const char *, bfd_boolean);
  2032. extern void _bfd_elf_strtab_addref
  2033.   (struct elf_strtab_hash *, bfd_size_type);
  2034. extern void _bfd_elf_strtab_delref
  2035.   (struct elf_strtab_hash *, bfd_size_type);
  2036. extern unsigned int _bfd_elf_strtab_refcount
  2037.   (struct elf_strtab_hash *, bfd_size_type);
  2038. extern void _bfd_elf_strtab_clear_all_refs
  2039.   (struct elf_strtab_hash *tab);
  2040. extern void _bfd_elf_strtab_restore_size
  2041.   (struct elf_strtab_hash *, bfd_size_type);
  2042. extern bfd_size_type _bfd_elf_strtab_size
  2043.   (struct elf_strtab_hash *);
  2044. extern bfd_size_type _bfd_elf_strtab_offset
  2045.   (struct elf_strtab_hash *, bfd_size_type);
  2046. extern bfd_boolean _bfd_elf_strtab_emit
  2047.   (bfd *, struct elf_strtab_hash *);
  2048. extern void _bfd_elf_strtab_finalize
  2049.   (struct elf_strtab_hash *);
  2050.  
  2051. extern bfd_boolean bfd_elf_parse_eh_frame_entries
  2052.   (bfd *, struct bfd_link_info *);
  2053. extern bfd_boolean _bfd_elf_parse_eh_frame_entry
  2054.   (struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
  2055. extern void _bfd_elf_parse_eh_frame
  2056.   (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
  2057. extern bfd_boolean _bfd_elf_end_eh_frame_parsing
  2058.   (struct bfd_link_info *info);
  2059.  
  2060. extern bfd_boolean _bfd_elf_discard_section_eh_frame
  2061.   (bfd *, struct bfd_link_info *, asection *,
  2062.    bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
  2063. extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
  2064.   (bfd *, struct bfd_link_info *);
  2065. extern bfd_vma _bfd_elf_eh_frame_section_offset
  2066.   (bfd *, struct bfd_link_info *, asection *, bfd_vma);
  2067. extern bfd_boolean _bfd_elf_write_section_eh_frame
  2068.   (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
  2069. bfd_boolean _bfd_elf_write_section_eh_frame_entry
  2070.   (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
  2071. extern bfd_boolean _bfd_elf_fixup_eh_frame_hdr (struct bfd_link_info *);
  2072. extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
  2073.   (bfd *, struct bfd_link_info *);
  2074. extern bfd_boolean _bfd_elf_eh_frame_present
  2075.   (struct bfd_link_info *);
  2076. extern bfd_boolean _bfd_elf_eh_frame_entry_present
  2077.   (struct bfd_link_info *);
  2078. extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
  2079.   (struct bfd_link_info *);
  2080.  
  2081. extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
  2082.  
  2083. extern long _bfd_elf_link_lookup_local_dynindx
  2084.   (struct bfd_link_info *, bfd *, long);
  2085. extern bfd_boolean _bfd_elf_compute_section_file_positions
  2086.   (bfd *, struct bfd_link_info *);
  2087. extern file_ptr _bfd_elf_assign_file_position_for_section
  2088.   (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
  2089.  
  2090. extern bfd_boolean _bfd_elf_validate_reloc
  2091.   (bfd *, arelent *);
  2092.  
  2093. extern bfd_boolean _bfd_elf_link_create_dynamic_sections
  2094.   (bfd *, struct bfd_link_info *);
  2095. extern bfd_boolean _bfd_elf_link_omit_section_dynsym
  2096.   (bfd *, struct bfd_link_info *, asection *);
  2097. extern bfd_boolean _bfd_elf_create_dynamic_sections
  2098.   (bfd *, struct bfd_link_info *);
  2099. extern bfd_boolean _bfd_elf_create_got_section
  2100.   (bfd *, struct bfd_link_info *);
  2101. extern asection *_bfd_elf_section_for_symbol
  2102.   (struct elf_reloc_cookie *, unsigned long, bfd_boolean);
  2103. extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
  2104.   (bfd *, struct bfd_link_info *, asection *, const char *);
  2105. extern void _bfd_elf_init_1_index_section
  2106.   (bfd *, struct bfd_link_info *);
  2107. extern void _bfd_elf_init_2_index_sections
  2108.   (bfd *, struct bfd_link_info *);
  2109.  
  2110. extern bfd_boolean _bfd_elfcore_make_pseudosection
  2111.   (bfd *, char *, size_t, ufile_ptr);
  2112. extern char *_bfd_elfcore_strndup
  2113.   (bfd *, char *, size_t);
  2114.  
  2115. extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
  2116.   (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
  2117.  
  2118. extern bfd_boolean _bfd_elf_link_output_relocs
  2119.   (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
  2120.    struct elf_link_hash_entry **);
  2121.  
  2122. extern bfd_boolean _bfd_elf_adjust_dynamic_copy
  2123.   (struct bfd_link_info *, struct elf_link_hash_entry *, asection *);
  2124.  
  2125. extern bfd_boolean _bfd_elf_dynamic_symbol_p
  2126.   (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
  2127.  
  2128. extern bfd_boolean _bfd_elf_symbol_refs_local_p
  2129.   (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
  2130.  
  2131. extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
  2132.   (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
  2133.  
  2134. extern bfd_boolean _bfd_elf_setup_sections
  2135.   (bfd *);
  2136.  
  2137. extern void _bfd_elf_post_process_headers (bfd * , struct bfd_link_info *);
  2138.  
  2139. extern const bfd_target *bfd_elf32_object_p
  2140.   (bfd *);
  2141. extern const bfd_target *bfd_elf32_core_file_p
  2142.   (bfd *);
  2143. extern char *bfd_elf32_core_file_failing_command
  2144.   (bfd *);
  2145. extern int bfd_elf32_core_file_failing_signal
  2146.   (bfd *);
  2147. extern bfd_boolean bfd_elf32_core_file_matches_executable_p
  2148.   (bfd *, bfd *);
  2149. extern int bfd_elf32_core_file_pid
  2150.   (bfd *);
  2151.  
  2152. extern bfd_boolean bfd_elf32_swap_symbol_in
  2153.   (bfd *, const void *, const void *, Elf_Internal_Sym *);
  2154. extern void bfd_elf32_swap_symbol_out
  2155.   (bfd *, const Elf_Internal_Sym *, void *, void *);
  2156. extern void bfd_elf32_swap_reloc_in
  2157.   (bfd *, const bfd_byte *, Elf_Internal_Rela *);
  2158. extern void bfd_elf32_swap_reloc_out
  2159.   (bfd *, const Elf_Internal_Rela *, bfd_byte *);
  2160. extern void bfd_elf32_swap_reloca_in
  2161.   (bfd *, const bfd_byte *, Elf_Internal_Rela *);
  2162. extern void bfd_elf32_swap_reloca_out
  2163.   (bfd *, const Elf_Internal_Rela *, bfd_byte *);
  2164. extern void bfd_elf32_swap_phdr_in
  2165.   (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
  2166. extern void bfd_elf32_swap_phdr_out
  2167.   (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
  2168. extern void bfd_elf32_swap_dyn_in
  2169.   (bfd *, const void *, Elf_Internal_Dyn *);
  2170. extern void bfd_elf32_swap_dyn_out
  2171.   (bfd *, const Elf_Internal_Dyn *, void *);
  2172. extern long bfd_elf32_slurp_symbol_table
  2173.   (bfd *, asymbol **, bfd_boolean);
  2174. extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
  2175.   (bfd *);
  2176. extern int bfd_elf32_write_out_phdrs
  2177.   (bfd *, const Elf_Internal_Phdr *, unsigned int);
  2178. extern bfd_boolean bfd_elf32_checksum_contents
  2179.   (bfd * , void (*) (const void *, size_t, void *), void *);
  2180. extern void bfd_elf32_write_relocs
  2181.   (bfd *, asection *, void *);
  2182. extern bfd_boolean bfd_elf32_slurp_reloc_table
  2183.   (bfd *, asection *, asymbol **, bfd_boolean);
  2184.  
  2185. extern const bfd_target *bfd_elf64_object_p
  2186.   (bfd *);
  2187. extern const bfd_target *bfd_elf64_core_file_p
  2188.   (bfd *);
  2189. extern char *bfd_elf64_core_file_failing_command
  2190.   (bfd *);
  2191. extern int bfd_elf64_core_file_failing_signal
  2192.   (bfd *);
  2193. extern bfd_boolean bfd_elf64_core_file_matches_executable_p
  2194.   (bfd *, bfd *);
  2195. extern int bfd_elf64_core_file_pid
  2196.   (bfd *);
  2197.  
  2198. extern bfd_boolean bfd_elf64_swap_symbol_in
  2199.   (bfd *, const void *, const void *, Elf_Internal_Sym *);
  2200. extern void bfd_elf64_swap_symbol_out
  2201.   (bfd *, const Elf_Internal_Sym *, void *, void *);
  2202. extern void bfd_elf64_swap_reloc_in
  2203.   (bfd *, const bfd_byte *, Elf_Internal_Rela *);
  2204. extern void bfd_elf64_swap_reloc_out
  2205.   (bfd *, const Elf_Internal_Rela *, bfd_byte *);
  2206. extern void bfd_elf64_swap_reloca_in
  2207.   (bfd *, const bfd_byte *, Elf_Internal_Rela *);
  2208. extern void bfd_elf64_swap_reloca_out
  2209.   (bfd *, const Elf_Internal_Rela *, bfd_byte *);
  2210. extern void bfd_elf64_swap_phdr_in
  2211.   (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
  2212. extern void bfd_elf64_swap_phdr_out
  2213.   (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
  2214. extern void bfd_elf64_swap_dyn_in
  2215.   (bfd *, const void *, Elf_Internal_Dyn *);
  2216. extern void bfd_elf64_swap_dyn_out
  2217.   (bfd *, const Elf_Internal_Dyn *, void *);
  2218. extern long bfd_elf64_slurp_symbol_table
  2219.   (bfd *, asymbol **, bfd_boolean);
  2220. extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
  2221.   (bfd *);
  2222. extern int bfd_elf64_write_out_phdrs
  2223.   (bfd *, const Elf_Internal_Phdr *, unsigned int);
  2224. extern bfd_boolean bfd_elf64_checksum_contents
  2225.   (bfd * , void (*) (const void *, size_t, void *), void *);
  2226. extern void bfd_elf64_write_relocs
  2227.   (bfd *, asection *, void *);
  2228. extern bfd_boolean bfd_elf64_slurp_reloc_table
  2229.   (bfd *, asection *, asymbol **, bfd_boolean);
  2230.  
  2231. extern bfd_boolean _bfd_elf_default_relocs_compatible
  2232.   (const bfd_target *, const bfd_target *);
  2233.  
  2234. extern bfd_boolean _bfd_elf_relocs_compatible
  2235.   (const bfd_target *, const bfd_target *);
  2236. extern bfd_boolean _bfd_elf_notice_as_needed
  2237.   (bfd *, struct bfd_link_info *, enum notice_asneeded_action);
  2238.  
  2239. extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
  2240.   (bfd *, struct bfd_link_info *, const char *);
  2241. extern bfd_boolean bfd_elf_link_add_symbols
  2242.   (bfd *, struct bfd_link_info *);
  2243. extern bfd_boolean _bfd_elf_add_dynamic_entry
  2244.   (struct bfd_link_info *, bfd_vma, bfd_vma);
  2245.  
  2246. extern bfd_boolean bfd_elf_link_record_dynamic_symbol
  2247.   (struct bfd_link_info *, struct elf_link_hash_entry *);
  2248.  
  2249. extern int bfd_elf_link_record_local_dynamic_symbol
  2250.   (struct bfd_link_info *, bfd *, long);
  2251.  
  2252. extern bfd_boolean _bfd_elf_close_and_cleanup
  2253.   (bfd *);
  2254.  
  2255. extern bfd_boolean _bfd_elf_common_definition
  2256.   (Elf_Internal_Sym *);
  2257.  
  2258. extern unsigned int _bfd_elf_common_section_index
  2259.   (asection *);
  2260.  
  2261. extern asection *_bfd_elf_common_section
  2262.   (asection *);
  2263.  
  2264. extern bfd_vma _bfd_elf_default_got_elt_size
  2265. (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
  2266.  unsigned long);
  2267.  
  2268. extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
  2269.   (bfd *, arelent *, struct bfd_symbol *, void *,
  2270.    asection *, bfd *, char **);
  2271.  
  2272. extern bfd_boolean bfd_elf_final_link
  2273.   (bfd *, struct bfd_link_info *);
  2274.  
  2275. extern void _bfd_elf_gc_keep
  2276.   (struct bfd_link_info *info);
  2277.  
  2278. extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
  2279.   (struct elf_link_hash_entry *h, void *inf);
  2280.  
  2281. extern bfd_boolean bfd_elf_gc_sections
  2282.   (bfd *, struct bfd_link_info *);
  2283.  
  2284. extern bfd_boolean bfd_elf_gc_record_vtinherit
  2285.   (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
  2286.  
  2287. extern bfd_boolean bfd_elf_gc_record_vtentry
  2288.   (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
  2289.  
  2290. extern asection *_bfd_elf_gc_mark_hook
  2291.   (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
  2292.    struct elf_link_hash_entry *, Elf_Internal_Sym *);
  2293.  
  2294. extern asection *_bfd_elf_gc_mark_rsec
  2295.   (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
  2296.    struct elf_reloc_cookie *, bfd_boolean *);
  2297.  
  2298. extern bfd_boolean _bfd_elf_gc_mark_reloc
  2299.   (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
  2300.    struct elf_reloc_cookie *);
  2301.  
  2302. extern bfd_boolean _bfd_elf_gc_mark_fdes
  2303.   (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
  2304.    struct elf_reloc_cookie *);
  2305.  
  2306. extern bfd_boolean _bfd_elf_gc_mark
  2307.   (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
  2308.  
  2309. extern bfd_boolean _bfd_elf_gc_mark_extra_sections
  2310.   (struct bfd_link_info *, elf_gc_mark_hook_fn);
  2311.  
  2312. extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
  2313.   (bfd *, struct bfd_link_info *);
  2314.  
  2315. extern bfd_boolean bfd_elf_gc_common_final_link
  2316.   (bfd *, struct bfd_link_info *);
  2317.  
  2318. extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
  2319.   (bfd_vma, void *);
  2320.  
  2321. extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
  2322.   (bfd *, asection *);
  2323.  
  2324. extern bfd_boolean _bfd_elf_map_sections_to_segments
  2325.   (bfd *, struct bfd_link_info *);
  2326.  
  2327. extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
  2328.  
  2329. extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *,
  2330.                                                   bfd_vma *);
  2331.  
  2332. extern asection *_bfd_elf_get_reloc_section (asection *);
  2333.  
  2334. extern int bfd_elf_get_default_section_type (flagword);
  2335.  
  2336. extern bfd_boolean bfd_elf_lookup_section_flags
  2337.   (struct bfd_link_info *, struct flag_info *, asection *);
  2338.  
  2339. extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
  2340.   (bfd * abfd, asection * section);
  2341.  
  2342. /* Exported interface for writing elf corefile notes. */
  2343. extern char *elfcore_write_note
  2344.   (bfd *, char *, int *, const char *, int, const void *, int);
  2345. extern char *elfcore_write_prpsinfo
  2346.   (bfd *, char *, int *, const char *, const char *);
  2347. extern char *elfcore_write_prstatus
  2348.   (bfd *, char *, int *, long, int, const void *);
  2349. extern char * elfcore_write_pstatus
  2350.   (bfd *, char *, int *, long, int, const void *);
  2351. extern char *elfcore_write_prfpreg
  2352.   (bfd *, char *, int *, const void *, int);
  2353. extern char *elfcore_write_prxfpreg
  2354.   (bfd *, char *, int *, const void *, int);
  2355. extern char *elfcore_write_xstatereg
  2356.   (bfd *, char *, int *, const void *, int);
  2357. extern char *elfcore_write_ppc_vmx
  2358.   (bfd *, char *, int *, const void *, int);
  2359. extern char *elfcore_write_ppc_vsx
  2360.   (bfd *, char *, int *, const void *, int);
  2361. extern char *elfcore_write_s390_timer
  2362.   (bfd *, char *, int *, const void *, int);
  2363. extern char *elfcore_write_s390_todcmp
  2364.   (bfd *, char *, int *, const void *, int);
  2365. extern char *elfcore_write_s390_todpreg
  2366.   (bfd *, char *, int *, const void *, int);
  2367. extern char *elfcore_write_s390_ctrs
  2368.   (bfd *, char *, int *, const void *, int);
  2369. extern char *elfcore_write_s390_prefix
  2370.   (bfd *, char *, int *, const void *, int);
  2371. extern char *elfcore_write_s390_last_break
  2372.   (bfd *, char *, int *, const void *, int);
  2373. extern char *elfcore_write_s390_system_call
  2374.   (bfd *, char *, int *, const void *, int);
  2375. extern char *elfcore_write_s390_tdb
  2376.   (bfd *, char *, int *, const void *, int);
  2377. extern char *elfcore_write_s390_vxrs_low
  2378.   (bfd *, char *, int *, const void *, int);
  2379. extern char *elfcore_write_s390_vxrs_high
  2380.   (bfd *, char *, int *, const void *, int);
  2381. extern char *elfcore_write_arm_vfp
  2382.   (bfd *, char *, int *, const void *, int);
  2383. extern char *elfcore_write_aarch_tls
  2384.   (bfd *, char *, int *, const void *, int);
  2385. extern char *elfcore_write_aarch_hw_break
  2386.   (bfd *, char *, int *, const void *, int);
  2387. extern char *elfcore_write_aarch_hw_watch
  2388.   (bfd *, char *, int *, const void *, int);
  2389. extern char *elfcore_write_lwpstatus
  2390.   (bfd *, char *, int *, long, int, const void *);
  2391. extern char *elfcore_write_register_note
  2392.   (bfd *, char *, int *, const char *, const void *, int);
  2393.  
  2394. /* Internal structure which holds information to be included in the
  2395.    PRPSINFO section of Linux core files.
  2396.  
  2397.    This is an "internal" structure in the sense that it should be used
  2398.    to pass information to BFD (via the `elfcore_write_linux_prpsinfo'
  2399.    function), so things like endianess shouldn't be an issue.  This
  2400.    structure will eventually be converted in one of the
  2401.    `elf_external_linux_*' structures and written out to an output bfd
  2402.    by one of the functions declared below.  */
  2403.  
  2404. struct elf_internal_linux_prpsinfo
  2405.   {
  2406.     char pr_state;                      /* Numeric process state.  */
  2407.     char pr_sname;                      /* Char for pr_state.  */
  2408.     char pr_zomb;                       /* Zombie.  */
  2409.     char pr_nice;                       /* Nice val.  */
  2410.     unsigned long pr_flag;              /* Flags.  */
  2411.     unsigned int pr_uid;
  2412.     unsigned int pr_gid;
  2413.     int pr_pid, pr_ppid, pr_pgrp, pr_sid;
  2414.     char pr_fname[16 + 1];              /* Filename of executable.  */
  2415.     char pr_psargs[80 + 1];             /* Initial part of arg list.  */
  2416.   };
  2417.  
  2418. /* Linux/most 32-bit archs.  */
  2419. extern char *elfcore_write_linux_prpsinfo32
  2420.   (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
  2421.  
  2422. /* Linux/most 64-bit archs.  */
  2423. extern char *elfcore_write_linux_prpsinfo64
  2424.   (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
  2425.  
  2426. /* Linux/PPC32 uses different layout compared to most archs.  */
  2427. extern char *elfcore_write_ppc_linux_prpsinfo32
  2428.   (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
  2429.  
  2430. extern bfd *_bfd_elf32_bfd_from_remote_memory
  2431.   (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
  2432.    int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
  2433. extern bfd *_bfd_elf64_bfd_from_remote_memory
  2434.   (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
  2435.    int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
  2436.  
  2437. extern bfd_vma bfd_elf_obj_attr_size (bfd *);
  2438. extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
  2439. extern int bfd_elf_get_obj_attr_int (bfd *, int, unsigned int);
  2440. extern void bfd_elf_add_obj_attr_int (bfd *, int, unsigned int, unsigned int);
  2441. #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
  2442.   bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
  2443. extern void bfd_elf_add_obj_attr_string (bfd *, int, unsigned int, const char *);
  2444. #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
  2445.   bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
  2446. extern void bfd_elf_add_obj_attr_int_string (bfd *, int, unsigned int,
  2447.                                              unsigned int, const char *);
  2448. #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
  2449.   bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
  2450.                                    (INTVAL), (STRVAL))
  2451.  
  2452. extern char *_bfd_elf_attr_strdup (bfd *, const char *);
  2453. extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
  2454. extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, unsigned int);
  2455. extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
  2456. extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
  2457. extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int);
  2458. extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *);
  2459. extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec);
  2460.  
  2461. /* The linker may need to keep track of the number of relocs that it
  2462.    decides to copy as dynamic relocs in check_relocs for each symbol.
  2463.    This is so that it can later discard them if they are found to be
  2464.    unnecessary.  We can store the information in a field extending the
  2465.    regular ELF linker hash table.  */
  2466.  
  2467. struct elf_dyn_relocs
  2468. {
  2469.   struct elf_dyn_relocs *next;
  2470.  
  2471.   /* The input section of the reloc.  */
  2472.   asection *sec;
  2473.  
  2474.   /* Total number of relocs copied for the input section.  */
  2475.   bfd_size_type count;
  2476.  
  2477.   /* Number of pc-relative relocs copied for the input section.  */
  2478.   bfd_size_type pc_count;
  2479. };
  2480.  
  2481. extern bfd_boolean _bfd_elf_create_ifunc_sections
  2482.   (bfd *, struct bfd_link_info *);
  2483. extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
  2484.   (struct bfd_link_info *, struct elf_link_hash_entry *,
  2485.    struct elf_dyn_relocs **, unsigned int, unsigned int, unsigned int);
  2486. extern long _bfd_elf_ifunc_get_synthetic_symtab
  2487.   (bfd *, long, asymbol **, long, asymbol **, asymbol **, asection *,
  2488.    bfd_vma *(*) (bfd *, asymbol **, asection *, asection *));
  2489.  
  2490. extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *);
  2491. extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *);
  2492.  
  2493. extern bfd_vma elf64_r_info (bfd_vma, bfd_vma);
  2494. extern bfd_vma elf64_r_sym (bfd_vma);
  2495. extern bfd_vma elf32_r_info (bfd_vma, bfd_vma);
  2496. extern bfd_vma elf32_r_sym (bfd_vma);
  2497.  
  2498. /* Large common section.  */
  2499. extern asection _bfd_elf_large_com_section;
  2500.  
  2501. /* Hash for local symbol with the first section id, ID, in the input
  2502.    file and the local symbol index, SYM.  */
  2503. #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
  2504.   (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
  2505.    ^ (SYM) ^ ((ID) >> 16))
  2506.  
  2507. /* This is the condition under which finish_dynamic_symbol will be called.
  2508.    If our finish_dynamic_symbol isn't called, we'll need to do something
  2509.    about initializing any .plt and .got entries in relocate_section.  */
  2510. #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
  2511.   ((DYN)                                                                \
  2512.    && ((SHARED) || !(H)->forced_local)                                  \
  2513.    && ((H)->dynindx != -1 || (H)->forced_local))
  2514.  
  2515. /* This macro is to avoid lots of duplicated code in the body
  2516.    of xxx_relocate_section() in the various elfxx-xxxx.c files.  */
  2517. #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel,    \
  2518.                                 r_symndx, symtab_hdr, sym_hashes,       \
  2519.                                 h, sec, relocation,                     \
  2520.                                 unresolved_reloc, warned, ignored)      \
  2521.   do                                                                    \
  2522.     {                                                                   \
  2523.       /* It seems this can happen with erroneous or unsupported         \
  2524.          input (mixing a.out and elf in an archive, for example.)  */   \
  2525.       if (sym_hashes == NULL)                                           \
  2526.         return FALSE;                                                   \
  2527.                                                                         \
  2528.       h = sym_hashes[r_symndx - symtab_hdr->sh_info];                   \
  2529.                                                                         \
  2530.       if (info->wrap_hash != NULL                                       \
  2531.           && (input_section->flags & SEC_DEBUGGING) != 0)               \
  2532.         h = ((struct elf_link_hash_entry *)                             \
  2533.              unwrap_hash_lookup (info, input_bfd, &h->root));           \
  2534.                                                                         \
  2535.       while (h->root.type == bfd_link_hash_indirect                     \
  2536.              || h->root.type == bfd_link_hash_warning)                  \
  2537.         h = (struct elf_link_hash_entry *) h->root.u.i.link;            \
  2538.                                                                         \
  2539.       warned = FALSE;                                                   \
  2540.       ignored = FALSE;                                                  \
  2541.       unresolved_reloc = FALSE;                                         \
  2542.       relocation = 0;                                                   \
  2543.       if (h->root.type == bfd_link_hash_defined                         \
  2544.           || h->root.type == bfd_link_hash_defweak)                     \
  2545.         {                                                               \
  2546.           sec = h->root.u.def.section;                                  \
  2547.           if (sec == NULL                                               \
  2548.               || sec->output_section == NULL)                           \
  2549.             /* Set a flag that will be cleared later if we find a       \
  2550.                relocation value for this symbol.  output_section        \
  2551.                is typically NULL for symbols satisfied by a shared      \
  2552.                library.  */                                             \
  2553.             unresolved_reloc = TRUE;                                    \
  2554.           else                                                          \
  2555.             relocation = (h->root.u.def.value                           \
  2556.                           + sec->output_section->vma                    \
  2557.                           + sec->output_offset);                        \
  2558.         }                                                               \
  2559.       else if (h->root.type == bfd_link_hash_undefweak)                 \
  2560.         ;                                                               \
  2561.       else if (info->unresolved_syms_in_objects == RM_IGNORE            \
  2562.                && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)          \
  2563.         ignored = TRUE;                                                 \
  2564.       else if (!bfd_link_relocatable (info))                            \
  2565.         {                                                               \
  2566.           bfd_boolean err;                                              \
  2567.           err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR  \
  2568.                  || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT);       \
  2569.           if (!info->callbacks->undefined_symbol (info,                 \
  2570.                                                   h->root.root.string,  \
  2571.                                                   input_bfd,            \
  2572.                                                   input_section,        \
  2573.                                                   rel->r_offset, err))  \
  2574.             return FALSE;                                               \
  2575.           warned = TRUE;                                                \
  2576.         }                                                               \
  2577.       (void) unresolved_reloc;                                          \
  2578.       (void) warned;                                                    \
  2579.       (void) ignored;                                                   \
  2580.     }                                                                   \
  2581.   while (0)
  2582.  
  2583. /* This macro is to avoid lots of duplicated code in the body of the
  2584.    loop over relocations in xxx_relocate_section() in the various
  2585.    elfxx-xxxx.c files.
  2586.  
  2587.    Handle relocations against symbols from removed linkonce sections,
  2588.    or sections discarded by a linker script.  When doing a relocatable
  2589.    link, we remove such relocations.  Otherwise, we just want the
  2590.    section contents zeroed and avoid any special processing.  */
  2591. #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
  2592.                                         rel, count, relend,             \
  2593.                                         howto, index, contents)         \
  2594.   {                                                                     \
  2595.     int i_;                                                             \
  2596.     _bfd_clear_contents (howto, input_bfd, input_section,               \
  2597.                          contents + rel[index].r_offset);               \
  2598.                                                                         \
  2599.     if (bfd_link_relocatable (info)                                     \
  2600.         && (input_section->flags & SEC_DEBUGGING))                      \
  2601.       {                                                                 \
  2602.         /* Only remove relocations in debug sections since other        \
  2603.            sections may require relocations.  */                        \
  2604.         Elf_Internal_Shdr *rel_hdr;                                     \
  2605.                                                                         \
  2606.         rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
  2607.                                                                         \
  2608.         /* Avoid empty output section.  */                              \
  2609.         if (rel_hdr->sh_size > rel_hdr->sh_entsize)                     \
  2610.           {                                                             \
  2611.             rel_hdr->sh_size -= rel_hdr->sh_entsize;                    \
  2612.             rel_hdr = _bfd_elf_single_rel_hdr (input_section);          \
  2613.             rel_hdr->sh_size -= rel_hdr->sh_entsize;                    \
  2614.                                                                         \
  2615.             memmove (rel, rel + count,                                  \
  2616.                      (relend - rel - count) * sizeof (*rel));           \
  2617.                                                                         \
  2618.             input_section->reloc_count--;                               \
  2619.             relend -= count;                                            \
  2620.             rel--;                                                      \
  2621.             continue;                                                   \
  2622.           }                                                             \
  2623.       }                                                                 \
  2624.                                                                         \
  2625.     for (i_ = 0; i_ < count; i_++)                                      \
  2626.       {                                                                 \
  2627.         rel[i_].r_info = 0;                                             \
  2628.         rel[i_].r_addend = 0;                                           \
  2629.       }                                                                 \
  2630.     rel += count - 1;                                                   \
  2631.     continue;                                                           \
  2632.   }
  2633.  
  2634. /* Will a symbol be bound to the definition within the shared
  2635.    library, if any.  A unique symbol can never be bound locally.  */
  2636. #define SYMBOLIC_BIND(INFO, H) \
  2637.     (!(H)->unique_global \
  2638.      && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic)))
  2639.  
  2640. #ifdef __cplusplus
  2641. }
  2642. #endif
  2643. #endif /* _LIBELF_H_ */
  2644.