Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Compare with Previous | Last modification | View Log | RSS feed

  1. /* ELF executable support for BFD.
  2.    Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
  3.    2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
  4.    Free Software Foundation, Inc.
  5.  
  6.    Written by Fred Fish @ Cygnus Support, from information published
  7.    in "UNIX System V Release 4, Programmers Guide: ANSI C and
  8.    Programming Support Tools".  Sufficient support for gdb.
  9.  
  10.    Rewritten by Mark Eichin @ Cygnus Support, from information
  11.    published in "System V Application Binary Interface", chapters 4
  12.    and 5, as well as the various "Processor Supplement" documents
  13.    derived from it. Added support for assembler and other object file
  14.    utilities.  Further work done by Ken Raeburn (Cygnus Support), Michael
  15.    Meissner (Open Software Foundation), and Peter Hoogenboom (University
  16.    of Utah) to finish and extend this.
  17.  
  18.    This file is part of BFD, the Binary File Descriptor library.
  19.  
  20.    This program is free software; you can redistribute it and/or modify
  21.    it under the terms of the GNU General Public License as published by
  22.    the Free Software Foundation; either version 3 of the License, or
  23.    (at your option) any later version.
  24.  
  25.    This program is distributed in the hope that it will be useful,
  26.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  27.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28.    GNU General Public License for more details.
  29.  
  30.    You should have received a copy of the GNU General Public License
  31.    along with this program; if not, write to the Free Software
  32.    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  33.    MA 02110-1301, USA.  */
  34.  
  35.  
  36. /* Problems and other issues to resolve.
  37.  
  38.    (1)  BFD expects there to be some fixed number of "sections" in
  39.         the object file.  I.E. there is a "section_count" variable in the
  40.         bfd structure which contains the number of sections.  However, ELF
  41.         supports multiple "views" of a file.  In particular, with current
  42.         implementations, executable files typically have two tables, a
  43.         program header table and a section header table, both of which
  44.         partition the executable.
  45.  
  46.         In ELF-speak, the "linking view" of the file uses the section header
  47.         table to access "sections" within the file, and the "execution view"
  48.         uses the program header table to access "segments" within the file.
  49.         "Segments" typically may contain all the data from one or more
  50.         "sections".
  51.  
  52.         Note that the section header table is optional in ELF executables,
  53.         but it is this information that is most useful to gdb.  If the
  54.         section header table is missing, then gdb should probably try
  55.         to make do with the program header table.  (FIXME)
  56.  
  57.    (2)  The code in this file is compiled twice, once in 32-bit mode and
  58.         once in 64-bit mode.  More of it should be made size-independent
  59.         and moved into elf.c.
  60.  
  61.    (3)  ELF section symbols are handled rather sloppily now.  This should
  62.         be cleaned up, and ELF section symbols reconciled with BFD section
  63.         symbols.
  64.  
  65.    (4)  We need a published spec for 64-bit ELF.  We've got some stuff here
  66.         that we're using for SPARC V9 64-bit chips, but don't assume that
  67.         it's cast in stone.
  68.  */
  69.  
  70. #include "sysdep.h"
  71. #include "bfd.h"
  72. #include "libiberty.h"
  73. #include "bfdlink.h"
  74. #include "libbfd.h"
  75. #include "elf-bfd.h"
  76.  
  77. /* Renaming structures, typedefs, macros and functions to be size-specific.  */
  78. #define Elf_External_Ehdr       NAME(Elf,External_Ehdr)
  79. #define Elf_External_Sym        NAME(Elf,External_Sym)
  80. #define Elf_External_Shdr       NAME(Elf,External_Shdr)
  81. #define Elf_External_Phdr       NAME(Elf,External_Phdr)
  82. #define Elf_External_Rel        NAME(Elf,External_Rel)
  83. #define Elf_External_Rela       NAME(Elf,External_Rela)
  84. #define Elf_External_Dyn        NAME(Elf,External_Dyn)
  85.  
  86. #define elf_core_file_failing_command   NAME(bfd_elf,core_file_failing_command)
  87. #define elf_core_file_failing_signal    NAME(bfd_elf,core_file_failing_signal)
  88. #define elf_core_file_matches_executable_p \
  89.   NAME(bfd_elf,core_file_matches_executable_p)
  90. #define elf_core_file_pid               NAME(bfd_elf,core_file_pid)
  91. #define elf_object_p                    NAME(bfd_elf,object_p)
  92. #define elf_core_file_p                 NAME(bfd_elf,core_file_p)
  93. #define elf_get_symtab_upper_bound      NAME(bfd_elf,get_symtab_upper_bound)
  94. #define elf_get_dynamic_symtab_upper_bound \
  95.   NAME(bfd_elf,get_dynamic_symtab_upper_bound)
  96. #define elf_swap_reloc_in               NAME(bfd_elf,swap_reloc_in)
  97. #define elf_swap_reloca_in              NAME(bfd_elf,swap_reloca_in)
  98. #define elf_swap_reloc_out              NAME(bfd_elf,swap_reloc_out)
  99. #define elf_swap_reloca_out             NAME(bfd_elf,swap_reloca_out)
  100. #define elf_swap_symbol_in              NAME(bfd_elf,swap_symbol_in)
  101. #define elf_swap_symbol_out             NAME(bfd_elf,swap_symbol_out)
  102. #define elf_swap_phdr_in                NAME(bfd_elf,swap_phdr_in)
  103. #define elf_swap_phdr_out               NAME(bfd_elf,swap_phdr_out)
  104. #define elf_swap_dyn_in                 NAME(bfd_elf,swap_dyn_in)
  105. #define elf_swap_dyn_out                NAME(bfd_elf,swap_dyn_out)
  106. #define elf_get_reloc_upper_bound       NAME(bfd_elf,get_reloc_upper_bound)
  107. #define elf_canonicalize_reloc          NAME(bfd_elf,canonicalize_reloc)
  108. #define elf_slurp_symbol_table          NAME(bfd_elf,slurp_symbol_table)
  109. #define elf_canonicalize_symtab         NAME(bfd_elf,canonicalize_symtab)
  110. #define elf_canonicalize_dynamic_symtab \
  111.   NAME(bfd_elf,canonicalize_dynamic_symtab)
  112. #define elf_get_synthetic_symtab \
  113.   NAME(bfd_elf,get_synthetic_symtab)
  114. #define elf_make_empty_symbol           NAME(bfd_elf,make_empty_symbol)
  115. #define elf_get_symbol_info             NAME(bfd_elf,get_symbol_info)
  116. #define elf_get_lineno                  NAME(bfd_elf,get_lineno)
  117. #define elf_set_arch_mach               NAME(bfd_elf,set_arch_mach)
  118. #define elf_find_nearest_line           NAME(bfd_elf,find_nearest_line)
  119. #define elf_sizeof_headers              NAME(bfd_elf,sizeof_headers)
  120. #define elf_set_section_contents        NAME(bfd_elf,set_section_contents)
  121. #define elf_no_info_to_howto            NAME(bfd_elf,no_info_to_howto)
  122. #define elf_no_info_to_howto_rel        NAME(bfd_elf,no_info_to_howto_rel)
  123. #define elf_find_section                NAME(bfd_elf,find_section)
  124. #define elf_write_shdrs_and_ehdr        NAME(bfd_elf,write_shdrs_and_ehdr)
  125. #define elf_write_out_phdrs             NAME(bfd_elf,write_out_phdrs)
  126. #define elf_checksum_contents           NAME(bfd_elf,checksum_contents)
  127. #define elf_write_relocs                NAME(bfd_elf,write_relocs)
  128. #define elf_slurp_reloc_table           NAME(bfd_elf,slurp_reloc_table)
  129.  
  130. #if ARCH_SIZE == 64
  131. #define ELF_R_INFO(X,Y) ELF64_R_INFO(X,Y)
  132. #define ELF_R_SYM(X)    ELF64_R_SYM(X)
  133. #define ELF_R_TYPE(X)   ELF64_R_TYPE(X)
  134. #define ELFCLASS        ELFCLASS64
  135. #define FILE_ALIGN      8
  136. #define LOG_FILE_ALIGN  3
  137. #endif
  138. #if ARCH_SIZE == 32
  139. #define ELF_R_INFO(X,Y) ELF32_R_INFO(X,Y)
  140. #define ELF_R_SYM(X)    ELF32_R_SYM(X)
  141. #define ELF_R_TYPE(X)   ELF32_R_TYPE(X)
  142. #define ELFCLASS        ELFCLASS32
  143. #define FILE_ALIGN      4
  144. #define LOG_FILE_ALIGN  2
  145. #endif
  146.  
  147. #if DEBUG & 2
  148. static void elf_debug_section (int, Elf_Internal_Shdr *);
  149. #endif
  150. #if DEBUG & 1
  151. static void elf_debug_file (Elf_Internal_Ehdr *);
  152. #endif
  154. /* Structure swapping routines */
  155.  
  156. /* Should perhaps use put_offset, put_word, etc.  For now, the two versions
  157.    can be handled by explicitly specifying 32 bits or "the long type".  */
  158. #if ARCH_SIZE == 64
  159. #define H_PUT_WORD              H_PUT_64
  160. #define H_PUT_SIGNED_WORD       H_PUT_S64
  161. #define H_GET_WORD              H_GET_64
  162. #define H_GET_SIGNED_WORD       H_GET_S64
  163. #endif
  164. #if ARCH_SIZE == 32
  165. #define H_PUT_WORD              H_PUT_32
  166. #define H_PUT_SIGNED_WORD       H_PUT_S32
  167. #define H_GET_WORD              H_GET_32
  168. #define H_GET_SIGNED_WORD       H_GET_S32
  169. #endif
  170.  
  171. /* Translate an ELF symbol in external format into an ELF symbol in internal
  172.    format.  */
  173.  
  174. bfd_boolean
  175. elf_swap_symbol_in (bfd *abfd,
  176.                     const void *psrc,
  177.                     const void *pshn,
  178.                     Elf_Internal_Sym *dst)
  179. {
  180.   const Elf_External_Sym *src = (const Elf_External_Sym *) psrc;
  181.   const Elf_External_Sym_Shndx *shndx = (const Elf_External_Sym_Shndx *) pshn;
  182.   int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma;
  183.  
  184.   dst->st_name = H_GET_32 (abfd, src->st_name);
  185.   if (signed_vma)
  186.     dst->st_value = H_GET_SIGNED_WORD (abfd, src->st_value);
  187.   else
  188.     dst->st_value = H_GET_WORD (abfd, src->st_value);
  189.   dst->st_size = H_GET_WORD (abfd, src->st_size);
  190.   dst->st_info = H_GET_8 (abfd, src->st_info);
  191.   dst->st_other = H_GET_8 (abfd, src->st_other);
  192.   dst->st_shndx = H_GET_16 (abfd, src->st_shndx);
  193.   if (dst->st_shndx == (SHN_XINDEX & 0xffff))
  194.     {
  195.       if (shndx == NULL)
  196.         return FALSE;
  197.       dst->st_shndx = H_GET_32 (abfd, shndx->est_shndx);
  198.     }
  199.   else if (dst->st_shndx >= (SHN_LORESERVE & 0xffff))
  200.     dst->st_shndx += SHN_LORESERVE - (SHN_LORESERVE & 0xffff);
  201.   dst->st_target_internal = 0;
  202.   return TRUE;
  203. }
  204.  
  205. /* Translate an ELF symbol in internal format into an ELF symbol in external
  206.    format.  */
  207.  
  208. void
  209. elf_swap_symbol_out (bfd *abfd,
  210.                      const Elf_Internal_Sym *src,
  211.                      void *cdst,
  212.                      void *shndx)
  213. {
  214.   unsigned int tmp;
  215.   Elf_External_Sym *dst = (Elf_External_Sym *) cdst;
  216.   H_PUT_32 (abfd, src->st_name, dst->st_name);
  217.   H_PUT_WORD (abfd, src->st_value, dst->st_value);
  218.   H_PUT_WORD (abfd, src->st_size, dst->st_size);
  219.   H_PUT_8 (abfd, src->st_info, dst->st_info);
  220.   H_PUT_8 (abfd, src->st_other, dst->st_other);
  221.   tmp = src->st_shndx;
  222.   if (tmp >= (SHN_LORESERVE & 0xffff) && tmp < SHN_LORESERVE)
  223.     {
  224.       if (shndx == NULL)
  225.         abort ();
  226.       H_PUT_32 (abfd, tmp, shndx);
  227.       tmp = SHN_XINDEX & 0xffff;
  228.     }
  229.   H_PUT_16 (abfd, tmp, dst->st_shndx);
  230. }
  231.  
  232. /* Translate an ELF file header in external format into an ELF file header in
  233.    internal format.  */
  234.  
  235. static void
  236. elf_swap_ehdr_in (bfd *abfd,
  237.                   const Elf_External_Ehdr *src,
  238.                   Elf_Internal_Ehdr *dst)
  239. {
  240.   int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma;
  241.   memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
  242.   dst->e_type = H_GET_16 (abfd, src->e_type);
  243.   dst->e_machine = H_GET_16 (abfd, src->e_machine);
  244.   dst->e_version = H_GET_32 (abfd, src->e_version);
  245.   if (signed_vma)
  246.     dst->e_entry = H_GET_SIGNED_WORD (abfd, src->e_entry);
  247.   else
  248.     dst->e_entry = H_GET_WORD (abfd, src->e_entry);
  249.   dst->e_phoff = H_GET_WORD (abfd, src->e_phoff);
  250.   dst->e_shoff = H_GET_WORD (abfd, src->e_shoff);
  251.   dst->e_flags = H_GET_32 (abfd, src->e_flags);
  252.   dst->e_ehsize = H_GET_16 (abfd, src->e_ehsize);
  253.   dst->e_phentsize = H_GET_16 (abfd, src->e_phentsize);
  254.   dst->e_phnum = H_GET_16 (abfd, src->e_phnum);
  255.   dst->e_shentsize = H_GET_16 (abfd, src->e_shentsize);
  256.   dst->e_shnum = H_GET_16 (abfd, src->e_shnum);
  257.   dst->e_shstrndx = H_GET_16 (abfd, src->e_shstrndx);
  258. }
  259.  
  260. /* Translate an ELF file header in internal format into an ELF file header in
  261.    external format.  */
  262.  
  263. static void
  264. elf_swap_ehdr_out (bfd *abfd,
  265.                    const Elf_Internal_Ehdr *src,
  266.                    Elf_External_Ehdr *dst)
  267. {
  268.   unsigned int tmp;
  269.   int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma;
  270.   memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
  271.   /* note that all elements of dst are *arrays of unsigned char* already...  */
  272.   H_PUT_16 (abfd, src->e_type, dst->e_type);
  273.   H_PUT_16 (abfd, src->e_machine, dst->e_machine);
  274.   H_PUT_32 (abfd, src->e_version, dst->e_version);
  275.   if (signed_vma)
  276.     H_PUT_SIGNED_WORD (abfd, src->e_entry, dst->e_entry);
  277.   else
  278.     H_PUT_WORD (abfd, src->e_entry, dst->e_entry);
  279.   H_PUT_WORD (abfd, src->e_phoff, dst->e_phoff);
  280.   H_PUT_WORD (abfd, src->e_shoff, dst->e_shoff);
  281.   H_PUT_32 (abfd, src->e_flags, dst->e_flags);
  282.   H_PUT_16 (abfd, src->e_ehsize, dst->e_ehsize);
  283.   H_PUT_16 (abfd, src->e_phentsize, dst->e_phentsize);
  284.   tmp = src->e_phnum;
  285.   if (tmp > PN_XNUM)
  286.     tmp = PN_XNUM;
  287.   H_PUT_16 (abfd, tmp, dst->e_phnum);
  288.   H_PUT_16 (abfd, src->e_shentsize, dst->e_shentsize);
  289.   tmp = src->e_shnum;
  290.   if (tmp >= (SHN_LORESERVE & 0xffff))
  291.     tmp = SHN_UNDEF;
  292.   H_PUT_16 (abfd, tmp, dst->e_shnum);
  293.   tmp = src->e_shstrndx;
  294.   if (tmp >= (SHN_LORESERVE & 0xffff))
  295.     tmp = SHN_XINDEX & 0xffff;
  296.   H_PUT_16 (abfd, tmp, dst->e_shstrndx);
  297. }
  298.  
  299. /* Translate an ELF section header table entry in external format into an
  300.    ELF section header table entry in internal format.  */
  301.  
  302. static void
  303. elf_swap_shdr_in (bfd *abfd,
  304.                   const Elf_External_Shdr *src,
  305.                   Elf_Internal_Shdr *dst)
  306. {
  307.   int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma;
  308.  
  309.   dst->sh_name = H_GET_32 (abfd, src->sh_name);
  310.   dst->sh_type = H_GET_32 (abfd, src->sh_type);
  311.   dst->sh_flags = H_GET_WORD (abfd, src->sh_flags);
  312.   if (signed_vma)
  313.     dst->sh_addr = H_GET_SIGNED_WORD (abfd, src->sh_addr);
  314.   else
  315.     dst->sh_addr = H_GET_WORD (abfd, src->sh_addr);
  316.   dst->sh_offset = H_GET_WORD (abfd, src->sh_offset);
  317.   dst->sh_size = H_GET_WORD (abfd, src->sh_size);
  318.   dst->sh_link = H_GET_32 (abfd, src->sh_link);
  319.   dst->sh_info = H_GET_32 (abfd, src->sh_info);
  320.   dst->sh_addralign = H_GET_WORD (abfd, src->sh_addralign);
  321.   dst->sh_entsize = H_GET_WORD (abfd, src->sh_entsize);
  322.   dst->bfd_section = NULL;
  323.   dst->contents = NULL;
  324. }
  325.  
  326. /* Translate an ELF section header table entry in internal format into an
  327.    ELF section header table entry in external format.  */
  328.  
  329. static void
  330. elf_swap_shdr_out (bfd *abfd,
  331.                    const Elf_Internal_Shdr *src,
  332.                    Elf_External_Shdr *dst)
  333. {
  334.   /* note that all elements of dst are *arrays of unsigned char* already...  */
  335.   H_PUT_32 (abfd, src->sh_name, dst->sh_name);
  336.   H_PUT_32 (abfd, src->sh_type, dst->sh_type);
  337.   H_PUT_WORD (abfd, src->sh_flags, dst->sh_flags);
  338.   H_PUT_WORD (abfd, src->sh_addr, dst->sh_addr);
  339.   H_PUT_WORD (abfd, src->sh_offset, dst->sh_offset);
  340.   H_PUT_WORD (abfd, src->sh_size, dst->sh_size);
  341.   H_PUT_32 (abfd, src->sh_link, dst->sh_link);
  342.   H_PUT_32 (abfd, src->sh_info, dst->sh_info);
  343.   H_PUT_WORD (abfd, src->sh_addralign, dst->sh_addralign);
  344.   H_PUT_WORD (abfd, src->sh_entsize, dst->sh_entsize);
  345. }
  346.  
  347. /* Translate an ELF program header table entry in external format into an
  348.    ELF program header table entry in internal format.  */
  349.  
  350. void
  351. elf_swap_phdr_in (bfd *abfd,
  352.                   const Elf_External_Phdr *src,
  353.                   Elf_Internal_Phdr *dst)
  354. {
  355.   int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma;
  356.  
  357.   dst->p_type = H_GET_32 (abfd, src->p_type);
  358.   dst->p_flags = H_GET_32 (abfd, src->p_flags);
  359.   dst->p_offset = H_GET_WORD (abfd, src->p_offset);
  360.   if (signed_vma)
  361.     {
  362.       dst->p_vaddr = H_GET_SIGNED_WORD (abfd, src->p_vaddr);
  363.       dst->p_paddr = H_GET_SIGNED_WORD (abfd, src->p_paddr);
  364.     }
  365.   else
  366.     {
  367.       dst->p_vaddr = H_GET_WORD (abfd, src->p_vaddr);
  368.       dst->p_paddr = H_GET_WORD (abfd, src->p_paddr);
  369.     }
  370.   dst->p_filesz = H_GET_WORD (abfd, src->p_filesz);
  371.   dst->p_memsz = H_GET_WORD (abfd, src->p_memsz);
  372.   dst->p_align = H_GET_WORD (abfd, src->p_align);
  373. }
  374.  
  375. void
  376. elf_swap_phdr_out (bfd *abfd,
  377.                    const Elf_Internal_Phdr *src,
  378.                    Elf_External_Phdr *dst)
  379. {
  380.   const struct elf_backend_data *bed;
  381.   bfd_vma p_paddr;
  382.  
  383.   bed = get_elf_backend_data (abfd);
  384.   p_paddr = bed->want_p_paddr_set_to_zero ? 0 : src->p_paddr;
  385.  
  386.   /* note that all elements of dst are *arrays of unsigned char* already...  */
  387.   H_PUT_32 (abfd, src->p_type, dst->p_type);
  388.   H_PUT_WORD (abfd, src->p_offset, dst->p_offset);
  389.   H_PUT_WORD (abfd, src->p_vaddr, dst->p_vaddr);
  390.   H_PUT_WORD (abfd, p_paddr, dst->p_paddr);
  391.   H_PUT_WORD (abfd, src->p_filesz, dst->p_filesz);
  392.   H_PUT_WORD (abfd, src->p_memsz, dst->p_memsz);
  393.   H_PUT_32 (abfd, src->p_flags, dst->p_flags);
  394.   H_PUT_WORD (abfd, src->p_align, dst->p_align);
  395. }
  396.  
  397. /* Translate an ELF reloc from external format to internal format.  */
  398. void
  399. elf_swap_reloc_in (bfd *abfd,
  400.                    const bfd_byte *s,
  401.                    Elf_Internal_Rela *dst)
  402. {
  403.   const Elf_External_Rel *src = (const Elf_External_Rel *) s;
  404.   dst->r_offset = H_GET_WORD (abfd, src->r_offset);
  405.   dst->r_info = H_GET_WORD (abfd, src->r_info);
  406.   dst->r_addend = 0;
  407. }
  408.  
  409. void
  410. elf_swap_reloca_in (bfd *abfd,
  411.                     const bfd_byte *s,
  412.                     Elf_Internal_Rela *dst)
  413. {
  414.   const Elf_External_Rela *src = (const Elf_External_Rela *) s;
  415.   dst->r_offset = H_GET_WORD (abfd, src->r_offset);
  416.   dst->r_info = H_GET_WORD (abfd, src->r_info);
  417.   dst->r_addend = H_GET_SIGNED_WORD (abfd, src->r_addend);
  418. }
  419.  
  420. /* Translate an ELF reloc from internal format to external format.  */
  421. void
  422. elf_swap_reloc_out (bfd *abfd,
  423.                     const Elf_Internal_Rela *src,
  424.                     bfd_byte *d)
  425. {
  426.   Elf_External_Rel *dst = (Elf_External_Rel *) d;
  427.   H_PUT_WORD (abfd, src->r_offset, dst->r_offset);
  428.   H_PUT_WORD (abfd, src->r_info, dst->r_info);
  429. }
  430.  
  431. void
  432. elf_swap_reloca_out (bfd *abfd,
  433.                      const Elf_Internal_Rela *src,
  434.                      bfd_byte *d)
  435. {
  436.   Elf_External_Rela *dst = (Elf_External_Rela *) d;
  437.   H_PUT_WORD (abfd, src->r_offset, dst->r_offset);
  438.   H_PUT_WORD (abfd, src->r_info, dst->r_info);
  439.   H_PUT_SIGNED_WORD (abfd, src->r_addend, dst->r_addend);
  440. }
  441.  
  442. void
  443. elf_swap_dyn_in (bfd *abfd,
  444.                  const void *p,
  445.                  Elf_Internal_Dyn *dst)
  446. {
  447.   const Elf_External_Dyn *src = (const Elf_External_Dyn *) p;
  448.  
  449.   dst->d_tag = H_GET_WORD (abfd, src->d_tag);
  450.   dst->d_un.d_val = H_GET_WORD (abfd, src->d_un.d_val);
  451. }
  452.  
  453. void
  454. elf_swap_dyn_out (bfd *abfd,
  455.                   const Elf_Internal_Dyn *src,
  456.                   void *p)
  457. {
  458.   Elf_External_Dyn *dst = (Elf_External_Dyn *) p;
  459.  
  460.   H_PUT_WORD (abfd, src->d_tag, dst->d_tag);
  461.   H_PUT_WORD (abfd, src->d_un.d_val, dst->d_un.d_val);
  462. }
  464. /* ELF .o/exec file reading */
  465.  
  466. /* Begin processing a given object.
  467.  
  468.    First we validate the file by reading in the ELF header and checking
  469.    the magic number.  */
  470.  
  471. static inline bfd_boolean
  472. elf_file_p (Elf_External_Ehdr *x_ehdrp)
  473. {
  474.   return ((x_ehdrp->e_ident[EI_MAG0] == ELFMAG0)
  475.           && (x_ehdrp->e_ident[EI_MAG1] == ELFMAG1)
  476.           && (x_ehdrp->e_ident[EI_MAG2] == ELFMAG2)
  477.           && (x_ehdrp->e_ident[EI_MAG3] == ELFMAG3));
  478. }
  479.  
  480. /* Check to see if the file associated with ABFD matches the target vector
  481.    that ABFD points to.
  482.  
  483.    Note that we may be called several times with the same ABFD, but different
  484.    target vectors, most of which will not match.  We have to avoid leaving
  485.    any side effects in ABFD, or any data it points to (like tdata), if the
  486.    file does not match the target vector.  */
  487.  
  488. const bfd_target *
  489. elf_object_p (bfd *abfd)
  490. {
  491.   Elf_External_Ehdr x_ehdr;     /* Elf file header, external form */
  492.   Elf_Internal_Ehdr *i_ehdrp;   /* Elf file header, internal form */
  493.   Elf_External_Shdr x_shdr;     /* Section header table entry, external form */
  494.   Elf_Internal_Shdr i_shdr;
  495.   Elf_Internal_Shdr *i_shdrp;   /* Section header table, internal form */
  496.   unsigned int shindex;
  497.   const struct elf_backend_data *ebd;
  498.   asection *s;
  499.   bfd_size_type amt;
  500.   const bfd_target *target;
  501.  
  502.   /* Read in the ELF header in external format.  */
  503.  
  504.   if (bfd_bread (&x_ehdr, sizeof (x_ehdr), abfd) != sizeof (x_ehdr))
  505.     {
  506.       if (bfd_get_error () != bfd_error_system_call)
  507.         goto got_wrong_format_error;
  508.       else
  509.         goto got_no_match;
  510.     }
  511.  
  512.   /* Now check to see if we have a valid ELF file, and one that BFD can
  513.      make use of.  The magic number must match, the address size ('class')
  514.      and byte-swapping must match our XVEC entry, and it must have a
  515.      section header table (FIXME: See comments re sections at top of this
  516.      file).  */
  517.  
  518.   if (! elf_file_p (&x_ehdr)
  519.       || x_ehdr.e_ident[EI_VERSION] != EV_CURRENT
  520.       || x_ehdr.e_ident[EI_CLASS] != ELFCLASS)
  521.     goto got_wrong_format_error;
  522.  
  523.   /* Check that file's byte order matches xvec's */
  524.   switch (x_ehdr.e_ident[EI_DATA])
  525.     {
  526.     case ELFDATA2MSB:           /* Big-endian */
  527.       if (! bfd_header_big_endian (abfd))
  528.         goto got_wrong_format_error;
  529.       break;
  530.     case ELFDATA2LSB:           /* Little-endian */
  531.       if (! bfd_header_little_endian (abfd))
  532.         goto got_wrong_format_error;
  533.       break;
  534.     case ELFDATANONE:           /* No data encoding specified */
  535.     default:                    /* Unknown data encoding specified */
  536.       goto got_wrong_format_error;
  537.     }
  538.  
  539.   target = abfd->xvec;
  540.  
  541.   /* Allocate an instance of the elf_obj_tdata structure and hook it up to
  542.      the tdata pointer in the bfd.  */
  543.  
  544.   if (! (*target->_bfd_set_format[bfd_object]) (abfd))
  545.     goto got_no_match;
  546.  
  547.   /* Now that we know the byte order, swap in the rest of the header */
  548.   i_ehdrp = elf_elfheader (abfd);
  549.   elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp);
  550. #if DEBUG & 1
  551.   elf_debug_file (i_ehdrp);
  552. #endif
  553.  
  554.   /* Reject ET_CORE (header indicates core file, not object file) */
  555.   if (i_ehdrp->e_type == ET_CORE)
  556.     goto got_wrong_format_error;
  557.  
  558.   /* If this is a relocatable file and there is no section header
  559.      table, then we're hosed.  */
  560.   if (i_ehdrp->e_shoff == 0 && i_ehdrp->e_type == ET_REL)
  561.     goto got_wrong_format_error;
  562.  
  563.   /* As a simple sanity check, verify that what BFD thinks is the
  564.      size of each section header table entry actually matches the size
  565.      recorded in the file, but only if there are any sections.  */
  566.   if (i_ehdrp->e_shentsize != sizeof (x_shdr) && i_ehdrp->e_shnum != 0)
  567.     goto got_wrong_format_error;
  568.  
  569.   /* Further sanity check.  */
  570.   if (i_ehdrp->e_shoff == 0 && i_ehdrp->e_shnum != 0)
  571.     goto got_wrong_format_error;
  572.  
  573.   ebd = get_elf_backend_data (abfd);
  574.   if (ebd->s->arch_size != ARCH_SIZE)
  575.     goto got_wrong_format_error;
  576.  
  577.   /* Check that the ELF e_machine field matches what this particular
  578.      BFD format expects.  */
  579.   if (ebd->elf_machine_code != i_ehdrp->e_machine
  580.       && (ebd->elf_machine_alt1 == 0
  581.           || i_ehdrp->e_machine != ebd->elf_machine_alt1)
  582.       && (ebd->elf_machine_alt2 == 0
  583.           || i_ehdrp->e_machine != ebd->elf_machine_alt2)
  584.       && ebd->elf_machine_code != EM_NONE)
  585.     goto got_wrong_format_error;
  586.  
  587.   if (i_ehdrp->e_type == ET_EXEC)
  588.     abfd->flags |= EXEC_P;
  589.   else if (i_ehdrp->e_type == ET_DYN)
  590.     abfd->flags |= DYNAMIC;
  591.  
  592.   if (i_ehdrp->e_phnum > 0)
  593.     abfd->flags |= D_PAGED;
  594.  
  595.   if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0))
  596.     {
  597.       /* It's OK if this fails for the generic target.  */
  598.       if (ebd->elf_machine_code != EM_NONE)
  599.         goto got_no_match;
  600.     }
  601.  
  602.   if (ebd->elf_machine_code != EM_NONE
  603.       && i_ehdrp->e_ident[EI_OSABI] != ebd->elf_osabi
  604.       && ebd->elf_osabi != ELFOSABI_NONE)
  605.     goto got_wrong_format_error;
  606.  
  607.   if (i_ehdrp->e_shoff != 0)
  608.     {
  609.       bfd_signed_vma where = i_ehdrp->e_shoff;
  610.  
  611.       if (where != (file_ptr) where)
  612.         goto got_wrong_format_error;
  613.  
  614.       /* Seek to the section header table in the file.  */
  615.       if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0)
  616.         goto got_no_match;
  617.  
  618.       /* Read the first section header at index 0, and convert to internal
  619.          form.  */
  620.       if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr))
  621.         goto got_no_match;
  622.       elf_swap_shdr_in (abfd, &x_shdr, &i_shdr);
  623.  
  624.       /* If the section count is zero, the actual count is in the first
  625.          section header.  */
  626.       if (i_ehdrp->e_shnum == SHN_UNDEF)
  627.         {
  628.           i_ehdrp->e_shnum = i_shdr.sh_size;
  629.           if (i_ehdrp->e_shnum >= SHN_LORESERVE
  630.               || i_ehdrp->e_shnum != i_shdr.sh_size
  631.               || i_ehdrp->e_shnum  == 0)
  632.             goto got_wrong_format_error;
  633.         }
  634.  
  635.       /* And similarly for the string table index.  */
  636.       if (i_ehdrp->e_shstrndx == (SHN_XINDEX & 0xffff))
  637.         {
  638.           i_ehdrp->e_shstrndx = i_shdr.sh_link;
  639.           if (i_ehdrp->e_shstrndx != i_shdr.sh_link)
  640.             goto got_wrong_format_error;
  641.         }
  642.  
  643.       /* And program headers.  */
  644.       if (i_ehdrp->e_phnum == PN_XNUM && i_shdr.sh_info != 0)
  645.         {
  646.           i_ehdrp->e_phnum = i_shdr.sh_info;
  647.           if (i_ehdrp->e_phnum != i_shdr.sh_info)
  648.             goto got_wrong_format_error;
  649.         }
  650.  
  651.       /* Sanity check that we can read all of the section headers.
  652.          It ought to be good enough to just read the last one.  */
  653.       if (i_ehdrp->e_shnum != 1)
  654.         {
  655.           /* Check that we don't have a totally silly number of sections.  */
  656.           if (i_ehdrp->e_shnum > (unsigned int) -1 / sizeof (x_shdr)
  657.               || i_ehdrp->e_shnum > (unsigned int) -1 / sizeof (i_shdr))
  658.             goto got_wrong_format_error;
  659.  
  660.           where += (i_ehdrp->e_shnum - 1) * sizeof (x_shdr);
  661.           if (where != (file_ptr) where)
  662.             goto got_wrong_format_error;
  663.           if ((bfd_size_type) where <= i_ehdrp->e_shoff)
  664.             goto got_wrong_format_error;
  665.  
  666.           if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0)
  667.             goto got_no_match;
  668.           if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr))
  669.             goto got_no_match;
  670.  
  671.           /* Back to where we were.  */
  672.           where = i_ehdrp->e_shoff + sizeof (x_shdr);
  673.           if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0)
  674.             goto got_no_match;
  675.         }
  676.     }
  677.  
  678.   /* Allocate space for a copy of the section header table in
  679.      internal form.  */
  680.   if (i_ehdrp->e_shnum != 0)
  681.     {
  682.       Elf_Internal_Shdr *shdrp;
  683.       unsigned int num_sec;
  684.  
  685.       amt = sizeof (*i_shdrp) * i_ehdrp->e_shnum;
  686.       i_shdrp = (Elf_Internal_Shdr *) bfd_alloc (abfd, amt);
  687.       if (!i_shdrp)
  688.         goto got_no_match;
  689.       num_sec = i_ehdrp->e_shnum;
  690.       elf_numsections (abfd) = num_sec;
  691.       amt = sizeof (i_shdrp) * num_sec;
  692.       elf_elfsections (abfd) = (Elf_Internal_Shdr **) bfd_alloc (abfd, amt);
  693.       if (!elf_elfsections (abfd))
  694.         goto got_no_match;
  695.  
  696.       memcpy (i_shdrp, &i_shdr, sizeof (*i_shdrp));
  697.       for (shdrp = i_shdrp, shindex = 0; shindex < num_sec; shindex++)
  698.         elf_elfsections (abfd)[shindex] = shdrp++;
  699.  
  700.       /* Read in the rest of the section header table and convert it
  701.          to internal form.  */
  702.       for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++)
  703.         {
  704.           if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr))
  705.             goto got_no_match;
  706.           elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex);
  707.  
  708.           /* Sanity check sh_link and sh_info.  */
  709.           if (i_shdrp[shindex].sh_link >= num_sec)
  710.             {
  711.               /* PR 10478: Accept Solaris binaries with a sh_link
  712.                  field set to SHN_BEFORE or SHN_AFTER.  */
  713.               switch (ebd->elf_machine_code)
  714.                 {
  715.                 case EM_386:
  716.                 case EM_486:
  717.                 case EM_X86_64:
  718.                 case EM_OLD_SPARCV9:
  719.                 case EM_SPARC32PLUS:
  720.                 case EM_SPARCV9:
  721.                 case EM_SPARC:
  722.                   if (i_shdrp[shindex].sh_link == (SHN_LORESERVE & 0xffff) /* SHN_BEFORE */
  723.                       || i_shdrp[shindex].sh_link == ((SHN_LORESERVE + 1) & 0xffff) /* SHN_AFTER */)
  724.                     break;
  725.                   /* Otherwise fall through.  */
  726.                 default:
  727.                   goto got_wrong_format_error;
  728.                 }
  729.             }
  730.  
  731.           if (((i_shdrp[shindex].sh_flags & SHF_INFO_LINK)
  732.                || i_shdrp[shindex].sh_type == SHT_RELA
  733.                || i_shdrp[shindex].sh_type == SHT_REL)
  734.               && i_shdrp[shindex].sh_info >= num_sec)
  735.             goto got_wrong_format_error;
  736.  
  737.           /* If the section is loaded, but not page aligned, clear
  738.              D_PAGED.  */
  739.           if (i_shdrp[shindex].sh_size != 0
  740.               && (i_shdrp[shindex].sh_flags & SHF_ALLOC) != 0
  741.               && i_shdrp[shindex].sh_type != SHT_NOBITS
  742.               && (((i_shdrp[shindex].sh_addr - i_shdrp[shindex].sh_offset)
  743.                    % ebd->minpagesize)
  744.                   != 0))
  745.             abfd->flags &= ~D_PAGED;
  746.         }
  747.     }
  748.  
  749.   /* A further sanity check.  */
  750.   if (i_ehdrp->e_shnum != 0)
  751.     {
  752.       if (i_ehdrp->e_shstrndx >= elf_numsections (abfd))
  753.         {
  754.           /* PR 2257:
  755.              We used to just goto got_wrong_format_error here
  756.              but there are binaries in existance for which this test
  757.              will prevent the binutils from working with them at all.
  758.              So we are kind, and reset the string index value to 0
  759.              so that at least some processing can be done.  */
  760.           i_ehdrp->e_shstrndx = SHN_UNDEF;
  761.           _bfd_error_handler (_("warning: %s has a corrupt string table index - ignoring"), abfd->filename);
  762.         }
  763.     }
  764.   else if (i_ehdrp->e_shstrndx != SHN_UNDEF)
  765.     goto got_wrong_format_error;
  766.  
  767.   /* Read in the program headers.  */
  768.   if (i_ehdrp->e_phnum == 0)
  769.     elf_tdata (abfd)->phdr = NULL;
  770.   else
  771.     {
  772.       Elf_Internal_Phdr *i_phdr;
  773.       unsigned int i;
  774.  
  775.       amt = i_ehdrp->e_phnum * sizeof (Elf_Internal_Phdr);
  776.       elf_tdata (abfd)->phdr = (Elf_Internal_Phdr *) bfd_alloc (abfd, amt);
  777.       if (elf_tdata (abfd)->phdr == NULL)
  778.         goto got_no_match;
  779.       if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_phoff, SEEK_SET) != 0)
  780.         goto got_no_match;
  781.       i_phdr = elf_tdata (abfd)->phdr;
  782.       for (i = 0; i < i_ehdrp->e_phnum; i++, i_phdr++)
  783.         {
  784.           Elf_External_Phdr x_phdr;
  785.  
  786.           if (bfd_bread (&x_phdr, sizeof x_phdr, abfd) != sizeof x_phdr)
  787.             goto got_no_match;
  788.           elf_swap_phdr_in (abfd, &x_phdr, i_phdr);
  789.         }
  790.     }
  791.  
  792.   if (i_ehdrp->e_shstrndx != 0 && i_ehdrp->e_shoff != 0)
  793.     {
  794.       unsigned int num_sec;
  795.  
  796.       /* Once all of the section headers have been read and converted, we
  797.          can start processing them.  Note that the first section header is
  798.          a dummy placeholder entry, so we ignore it.  */
  799.       num_sec = elf_numsections (abfd);
  800.       for (shindex = 1; shindex < num_sec; shindex++)
  801.         if (!bfd_section_from_shdr (abfd, shindex))
  802.           goto got_no_match;
  803.  
  804.       /* Set up ELF sections for SHF_GROUP and SHF_LINK_ORDER.  */
  805.       if (! _bfd_elf_setup_sections (abfd))
  806.         goto got_wrong_format_error;
  807.     }
  808.  
  809.   /* Let the backend double check the format and override global
  810.      information.  */
  811.   if (ebd->elf_backend_object_p)
  812.     {
  813.       if (! (*ebd->elf_backend_object_p) (abfd))
  814.         goto got_wrong_format_error;
  815.     }
  816.  
  817.   /* Remember the entry point specified in the ELF file header.  */
  818.   bfd_set_start_address (abfd, i_ehdrp->e_entry);
  819.  
  820.   /* If we have created any reloc sections that are associated with
  821.      debugging sections, mark the reloc sections as debugging as well.  */
  822.   for (s = abfd->sections; s != NULL; s = s->next)
  823.     {
  824.       if ((elf_section_data (s)->this_hdr.sh_type == SHT_REL
  825.            || elf_section_data (s)->this_hdr.sh_type == SHT_RELA)
  826.           && elf_section_data (s)->this_hdr.sh_info > 0)
  827.         {
  828.           unsigned long targ_index;
  829.           asection *targ_sec;
  830.  
  831.           targ_index = elf_section_data (s)->this_hdr.sh_info;
  832.           targ_sec = bfd_section_from_elf_index (abfd, targ_index);
  833.           if (targ_sec != NULL
  834.               && (targ_sec->flags & SEC_DEBUGGING) != 0)
  835.             s->flags |= SEC_DEBUGGING;
  836.         }
  837.     }
  838.   return target;
  839.  
  840.  got_wrong_format_error:
  841.   bfd_set_error (bfd_error_wrong_format);
  842.  
  843.  got_no_match:
  844.   return NULL;
  845. }
  847. /* ELF .o/exec file writing */
  848.  
  849. /* Write out the relocs.  */
  850.  
  851. void
  852. elf_write_relocs (bfd *abfd, asection *sec, void *data)
  853. {
  854.   bfd_boolean *failedp = (bfd_boolean *) data;
  855.   Elf_Internal_Shdr *rela_hdr;
  856.   bfd_vma addr_offset;
  857.   void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
  858.   size_t extsize;
  859.   bfd_byte *dst_rela;
  860.   unsigned int idx;
  861.   asymbol *last_sym;
  862.   int last_sym_idx;
  863.  
  864.   /* If we have already failed, don't do anything.  */
  865.   if (*failedp)
  866.     return;
  867.  
  868.   if ((sec->flags & SEC_RELOC) == 0)
  869.     return;
  870.  
  871.   /* The linker backend writes the relocs out itself, and sets the
  872.      reloc_count field to zero to inhibit writing them here.  Also,
  873.      sometimes the SEC_RELOC flag gets set even when there aren't any
  874.      relocs.  */
  875.   if (sec->reloc_count == 0)
  876.     return;
  877.  
  878.   /* If we have opened an existing file for update, reloc_count may be
  879.      set even though we are not linking.  In that case we have nothing
  880.      to do.  */
  881.   if (sec->orelocation == NULL)
  882.     return;
  883.  
  884.   rela_hdr = elf_section_data (sec)->rela.hdr;
  885.   if (rela_hdr == NULL)
  886.     rela_hdr = elf_section_data (sec)->rel.hdr;
  887.  
  888.   rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count;
  889.   rela_hdr->contents = (unsigned char *) bfd_alloc (abfd, rela_hdr->sh_size);
  890.   if (rela_hdr->contents == NULL)
  891.     {
  892.       *failedp = TRUE;
  893.       return;
  894.     }
  895.  
  896.   /* Figure out whether the relocations are RELA or REL relocations.  */
  897.   if (rela_hdr->sh_type == SHT_RELA)
  898.     {
  899.       swap_out = elf_swap_reloca_out;
  900.       extsize = sizeof (Elf_External_Rela);
  901.     }
  902.   else if (rela_hdr->sh_type == SHT_REL)
  903.     {
  904.       swap_out = elf_swap_reloc_out;
  905.       extsize = sizeof (Elf_External_Rel);
  906.     }
  907.   else
  908.     /* Every relocation section should be either an SHT_RELA or an
  909.        SHT_REL section.  */
  910.     abort ();
  911.  
  912.   /* The address of an ELF reloc is section relative for an object
  913.      file, and absolute for an executable file or shared library.
  914.      The address of a BFD reloc is always section relative.  */
  915.   addr_offset = 0;
  916.   if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
  917.     addr_offset = sec->vma;
  918.  
  919.   /* orelocation has the data, reloc_count has the count...  */
  920.   last_sym = 0;
  921.   last_sym_idx = 0;
  922.   dst_rela = rela_hdr->contents;
  923.  
  924.   for (idx = 0; idx < sec->reloc_count; idx++, dst_rela += extsize)
  925.     {
  926.       Elf_Internal_Rela src_rela;
  927.       arelent *ptr;
  928.       asymbol *sym;
  929.       int n;
  930.  
  931.       ptr = sec->orelocation[idx];
  932.       sym = *ptr->sym_ptr_ptr;
  933.       if (sym == last_sym)
  934.         n = last_sym_idx;
  935.       else if (bfd_is_abs_section (sym->section) && sym->value == 0)
  936.         n = STN_UNDEF;
  937.       else
  938.         {
  939.           last_sym = sym;
  940.           n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym);
  941.           if (n < 0)
  942.             {
  943.               *failedp = TRUE;
  944.               return;
  945.             }
  946.           last_sym_idx = n;
  947.         }
  948.  
  949.       if ((*ptr->sym_ptr_ptr)->the_bfd != NULL
  950.           && (*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec
  951.           && ! _bfd_elf_validate_reloc (abfd, ptr))
  952.         {
  953.           *failedp = TRUE;
  954.           return;
  955.         }
  956.  
  957.       src_rela.r_offset = ptr->address + addr_offset;
  958.       src_rela.r_info = ELF_R_INFO (n, ptr->howto->type);
  959.       src_rela.r_addend = ptr->addend;
  960.       (*swap_out) (abfd, &src_rela, dst_rela);
  961.     }
  962. }
  963.  
  964. /* Write out the program headers.  */
  965.  
  966. int
  967. elf_write_out_phdrs (bfd *abfd,
  968.                      const Elf_Internal_Phdr *phdr,
  969.                      unsigned int count)
  970. {
  971.   while (count--)
  972.     {
  973.       Elf_External_Phdr extphdr;
  974.       elf_swap_phdr_out (abfd, phdr, &extphdr);
  975.       if (bfd_bwrite (&extphdr, sizeof (Elf_External_Phdr), abfd)
  976.           != sizeof (Elf_External_Phdr))
  977.         return -1;
  978.       phdr++;
  979.     }
  980.   return 0;
  981. }
  982.  
  983. /* Write out the section headers and the ELF file header.  */
  984.  
  985. bfd_boolean
  986. elf_write_shdrs_and_ehdr (bfd *abfd)
  987. {
  988.   Elf_External_Ehdr x_ehdr;     /* Elf file header, external form */
  989.   Elf_Internal_Ehdr *i_ehdrp;   /* Elf file header, internal form */
  990.   Elf_External_Shdr *x_shdrp;   /* Section header table, external form */
  991.   Elf_Internal_Shdr **i_shdrp;  /* Section header table, internal form */
  992.   unsigned int count;
  993.   bfd_size_type amt;
  994.  
  995.   i_ehdrp = elf_elfheader (abfd);
  996.   i_shdrp = elf_elfsections (abfd);
  997.  
  998.   /* swap the header before spitting it out...  */
  999.  
  1000. #if DEBUG & 1
  1001.   elf_debug_file (i_ehdrp);
  1002. #endif
  1003.   elf_swap_ehdr_out (abfd, i_ehdrp, &x_ehdr);
  1004.   amt = sizeof (x_ehdr);
  1005.   if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
  1006.       || bfd_bwrite (&x_ehdr, amt, abfd) != amt)
  1007.     return FALSE;
  1008.  
  1009.   /* Some fields in the first section header handle overflow of ehdr
  1010.      fields.  */
  1011.   if (i_ehdrp->e_phnum >= PN_XNUM)
  1012.     i_shdrp[0]->sh_info = i_ehdrp->e_phnum;
  1013.   if (i_ehdrp->e_shnum >= (SHN_LORESERVE & 0xffff))
  1014.     i_shdrp[0]->sh_size = i_ehdrp->e_shnum;
  1015.   if (i_ehdrp->e_shstrndx >= (SHN_LORESERVE & 0xffff))
  1016.     i_shdrp[0]->sh_link = i_ehdrp->e_shstrndx;
  1017.  
  1018.   /* at this point we've concocted all the ELF sections...  */
  1019.   amt = i_ehdrp->e_shnum;
  1020.   amt *= sizeof (*x_shdrp);
  1021.   x_shdrp = (Elf_External_Shdr *) bfd_alloc (abfd, amt);
  1022.   if (!x_shdrp)
  1023.     return FALSE;
  1024.  
  1025.   for (count = 0; count < i_ehdrp->e_shnum; i_shdrp++, count++)
  1026.     {
  1027. #if DEBUG & 2
  1028.       elf_debug_section (count, *i_shdrp);
  1029. #endif
  1030.       elf_swap_shdr_out (abfd, *i_shdrp, x_shdrp + count);
  1031.     }
  1032.   if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0
  1033.       || bfd_bwrite (x_shdrp, amt, abfd) != amt)
  1034.     return FALSE;
  1035.  
  1036.   /* need to dump the string table too...  */
  1037.  
  1038.   return TRUE;
  1039. }
  1040.  
  1041. bfd_boolean
  1042. elf_checksum_contents (bfd *abfd,
  1043.                        void (*process) (const void *, size_t, void *),
  1044.                        void *arg)
  1045. {
  1046.   Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
  1047.   Elf_Internal_Shdr **i_shdrp = elf_elfsections (abfd);
  1048.   Elf_Internal_Phdr *i_phdrp = elf_tdata (abfd)->phdr;
  1049.   unsigned int count, num;
  1050.  
  1051.   {
  1052.     Elf_External_Ehdr x_ehdr;
  1053.     Elf_Internal_Ehdr i_ehdr;
  1054.  
  1055.     i_ehdr = *i_ehdrp;
  1056.     i_ehdr.e_phoff = i_ehdr.e_shoff = 0;
  1057.     elf_swap_ehdr_out (abfd, &i_ehdr, &x_ehdr);
  1058.     (*process) (&x_ehdr, sizeof x_ehdr, arg);
  1059.   }
  1060.  
  1061.   num = i_ehdrp->e_phnum;
  1062.   for (count = 0; count < num; count++)
  1063.     {
  1064.       Elf_External_Phdr x_phdr;
  1065.       elf_swap_phdr_out (abfd, &i_phdrp[count], &x_phdr);
  1066.       (*process) (&x_phdr, sizeof x_phdr, arg);
  1067.     }
  1068.  
  1069.   num = elf_numsections (abfd);
  1070.   for (count = 0; count < num; count++)
  1071.     {
  1072.       Elf_Internal_Shdr i_shdr;
  1073.       Elf_External_Shdr x_shdr;
  1074.       bfd_byte *contents, *free_contents;
  1075.  
  1076.       i_shdr = *i_shdrp[count];
  1077.       i_shdr.sh_offset = 0;
  1078.  
  1079.       elf_swap_shdr_out (abfd, &i_shdr, &x_shdr);
  1080.       (*process) (&x_shdr, sizeof x_shdr, arg);
  1081.  
  1082.       /* Process the section's contents, if it has some.
  1083.          PR ld/12451: Read them in if necessary.  */
  1084.       if (i_shdr.sh_type == SHT_NOBITS)
  1085.         continue;
  1086.       free_contents = NULL;
  1087.       contents = i_shdr.contents;
  1088.       if (contents == NULL)
  1089.         {
  1090.           asection *sec;
  1091.  
  1092.           sec = bfd_section_from_elf_index (abfd, count);
  1093.           if (sec != NULL)
  1094.             {
  1095.               contents = sec->contents;
  1096.               if (contents == NULL)
  1097.                 {
  1098.                   /* Force rereading from file.  */
  1099.                   sec->flags &= ~SEC_IN_MEMORY;
  1100.                   if (!bfd_malloc_and_get_section (abfd, sec, &free_contents))
  1101.                     continue;
  1102.                   contents = free_contents;
  1103.                 }
  1104.             }
  1105.         }
  1106.       if (contents != NULL)
  1107.         {
  1108.           (*process) (contents, i_shdr.sh_size, arg);
  1109.           if (free_contents != NULL)
  1110.             free (free_contents);
  1111.         }
  1112.     }
  1113.  
  1114.   return TRUE;
  1115. }
  1116.  
  1117. long
  1118. elf_slurp_symbol_table (bfd *abfd, asymbol **symptrs, bfd_boolean dynamic)
  1119. {
  1120.   Elf_Internal_Shdr *hdr;
  1121.   Elf_Internal_Shdr *verhdr;
  1122.   unsigned long symcount;       /* Number of external ELF symbols */
  1123.   elf_symbol_type *sym;         /* Pointer to current bfd symbol */
  1124.   elf_symbol_type *symbase;     /* Buffer for generated bfd symbols */
  1125.   Elf_Internal_Sym *isym;
  1126.   Elf_Internal_Sym *isymend;
  1127.   Elf_Internal_Sym *isymbuf = NULL;
  1128.   Elf_External_Versym *xver;
  1129.   Elf_External_Versym *xverbuf = NULL;
  1130.   const struct elf_backend_data *ebd;
  1131.   bfd_size_type amt;
  1132.  
  1133.   /* Read each raw ELF symbol, converting from external ELF form to
  1134.      internal ELF form, and then using the information to create a
  1135.      canonical bfd symbol table entry.
  1136.  
  1137.      Note that we allocate the initial bfd canonical symbol buffer
  1138.      based on a one-to-one mapping of the ELF symbols to canonical
  1139.      symbols.  We actually use all the ELF symbols, so there will be no
  1140.      space left over at the end.  When we have all the symbols, we
  1141.      build the caller's pointer vector.  */
  1142.  
  1143.   if (! dynamic)
  1144.     {
  1145.       hdr = &elf_tdata (abfd)->symtab_hdr;
  1146.       verhdr = NULL;
  1147.     }
  1148.   else
  1149.     {
  1150.       hdr = &elf_tdata (abfd)->dynsymtab_hdr;
  1151.       if (elf_dynversym (abfd) == 0)
  1152.         verhdr = NULL;
  1153.       else
  1154.         verhdr = &elf_tdata (abfd)->dynversym_hdr;
  1155.       if ((elf_dynverdef (abfd) != 0
  1156.            && elf_tdata (abfd)->verdef == NULL)
  1157.           || (elf_dynverref (abfd) != 0
  1158.               && elf_tdata (abfd)->verref == NULL))
  1159.         {
  1160.           if (!_bfd_elf_slurp_version_tables (abfd, FALSE))
  1161.             return -1;
  1162.         }
  1163.     }
  1164.  
  1165.   ebd = get_elf_backend_data (abfd);
  1166.   symcount = hdr->sh_size / sizeof (Elf_External_Sym);
  1167.   if (symcount == 0)
  1168.     sym = symbase = NULL;
  1169.   else
  1170.     {
  1171.       isymbuf = bfd_elf_get_elf_syms (abfd, hdr, symcount, 0,
  1172.                                       NULL, NULL, NULL);
  1173.       if (isymbuf == NULL)
  1174.         return -1;
  1175.  
  1176.       amt = symcount;
  1177.       amt *= sizeof (elf_symbol_type);
  1178.       symbase = (elf_symbol_type *) bfd_zalloc (abfd, amt);
  1179.       if (symbase == (elf_symbol_type *) NULL)
  1180.         goto error_return;
  1181.  
  1182.       /* Read the raw ELF version symbol information.  */
  1183.       if (verhdr != NULL
  1184.           && verhdr->sh_size / sizeof (Elf_External_Versym) != symcount)
  1185.         {
  1186.           (*_bfd_error_handler)
  1187.             (_("%s: version count (%ld) does not match symbol count (%ld)"),
  1188.              abfd->filename,
  1189.              (long) (verhdr->sh_size / sizeof (Elf_External_Versym)),
  1190.              symcount);
  1191.  
  1192.           /* Slurp in the symbols without the version information,
  1193.              since that is more helpful than just quitting.  */
  1194.           verhdr = NULL;
  1195.         }
  1196.  
  1197.       if (verhdr != NULL)
  1198.         {
  1199.           if (bfd_seek (abfd, verhdr->sh_offset, SEEK_SET) != 0)
  1200.             goto error_return;
  1201.  
  1202.           xverbuf = (Elf_External_Versym *) bfd_malloc (verhdr->sh_size);
  1203.           if (xverbuf == NULL && verhdr->sh_size != 0)
  1204.             goto error_return;
  1205.  
  1206.           if (bfd_bread (xverbuf, verhdr->sh_size, abfd) != verhdr->sh_size)
  1207.             goto error_return;
  1208.         }
  1209.  
  1210.       /* Skip first symbol, which is a null dummy.  */
  1211.       xver = xverbuf;
  1212.       if (xver != NULL)
  1213.         ++xver;
  1214.       isymend = isymbuf + symcount;
  1215.       for (isym = isymbuf + 1, sym = symbase; isym < isymend; isym++, sym++)
  1216.         {
  1217.           memcpy (&sym->internal_elf_sym, isym, sizeof (Elf_Internal_Sym));
  1218.           sym->symbol.the_bfd = abfd;
  1219.  
  1220.           sym->symbol.name = bfd_elf_sym_name (abfd, hdr, isym, NULL);
  1221.  
  1222.           sym->symbol.value = isym->st_value;
  1223.  
  1224.           if (isym->st_shndx == SHN_UNDEF)
  1225.             {
  1226.               sym->symbol.section = bfd_und_section_ptr;
  1227.             }
  1228.           else if (isym->st_shndx == SHN_ABS)
  1229.             {
  1230.               sym->symbol.section = bfd_abs_section_ptr;
  1231.             }
  1232.           else if (isym->st_shndx == SHN_COMMON)
  1233.             {
  1234.               sym->symbol.section = bfd_com_section_ptr;
  1235.               if ((abfd->flags & BFD_PLUGIN) != 0)
  1236.                 {
  1237.                   asection *xc = bfd_get_section_by_name (abfd, "COMMON");
  1238.  
  1239.                   if (xc == NULL)
  1240.                     {
  1241.                       flagword flags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
  1242.                                         | SEC_EXCLUDE);
  1243.                       xc = bfd_make_section_with_flags (abfd, "COMMON", flags);
  1244.                       if (xc == NULL)
  1245.                         goto error_return;
  1246.                     }
  1247.                   sym->symbol.section = xc;
  1248.                 }
  1249.               /* Elf puts the alignment into the `value' field, and
  1250.                  the size into the `size' field.  BFD wants to see the
  1251.                  size in the value field, and doesn't care (at the
  1252.                  moment) about the alignment.  */
  1253.               sym->symbol.value = isym->st_size;
  1254.             }
  1255.           else
  1256.             {
  1257.               sym->symbol.section
  1258.                 = bfd_section_from_elf_index (abfd, isym->st_shndx);
  1259.               if (sym->symbol.section == NULL)
  1260.                 {
  1261.                   /* This symbol is in a section for which we did not
  1262.                      create a BFD section.  Just use bfd_abs_section,
  1263.                      although it is wrong.  FIXME.  */
  1264.                   sym->symbol.section = bfd_abs_section_ptr;
  1265.                 }
  1266.             }
  1267.  
  1268.           /* If this is a relocatable file, then the symbol value is
  1269.              already section relative.  */
  1270.           if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
  1271.             sym->symbol.value -= sym->symbol.section->vma;
  1272.  
  1273.           switch (ELF_ST_BIND (isym->st_info))
  1274.             {
  1275.             case STB_LOCAL:
  1276.               sym->symbol.flags |= BSF_LOCAL;
  1277.               break;
  1278.             case STB_GLOBAL:
  1279.               if (isym->st_shndx != SHN_UNDEF && isym->st_shndx != SHN_COMMON)
  1280.                 sym->symbol.flags |= BSF_GLOBAL;
  1281.               break;
  1282.             case STB_WEAK:
  1283.               sym->symbol.flags |= BSF_WEAK;
  1284.               break;
  1285.             case STB_GNU_UNIQUE:
  1286.               sym->symbol.flags |= BSF_GNU_UNIQUE;
  1287.               break;
  1288.             }
  1289.  
  1290.           switch (ELF_ST_TYPE (isym->st_info))
  1291.             {
  1292.             case STT_SECTION:
  1293.               sym->symbol.flags |= BSF_SECTION_SYM | BSF_DEBUGGING;
  1294.               break;
  1295.             case STT_FILE:
  1296.               sym->symbol.flags |= BSF_FILE | BSF_DEBUGGING;
  1297.               break;
  1298.             case STT_FUNC:
  1299.               sym->symbol.flags |= BSF_FUNCTION;
  1300.               break;
  1301.             case STT_COMMON:
  1302.               /* FIXME: Do we have to put the size field into the value field
  1303.                  as we do with symbols in SHN_COMMON sections (see above) ?  */
  1304.               /* Fall through.  */
  1305.             case STT_OBJECT:
  1306.               sym->symbol.flags |= BSF_OBJECT;
  1307.               break;
  1308.             case STT_TLS:
  1309.               sym->symbol.flags |= BSF_THREAD_LOCAL;
  1310.               break;
  1311.             case STT_RELC:
  1312.               sym->symbol.flags |= BSF_RELC;
  1313.               break;
  1314.             case STT_SRELC:
  1315.               sym->symbol.flags |= BSF_SRELC;
  1316.               break;
  1317.             case STT_GNU_IFUNC:
  1318.               sym->symbol.flags |= BSF_GNU_INDIRECT_FUNCTION;
  1319.               break;
  1320.             }
  1321.  
  1322.           if (dynamic)
  1323.             sym->symbol.flags |= BSF_DYNAMIC;
  1324.  
  1325.           if (xver != NULL)
  1326.             {
  1327.               Elf_Internal_Versym iversym;
  1328.  
  1329.               _bfd_elf_swap_versym_in (abfd, xver, &iversym);
  1330.               sym->version = iversym.vs_vers;
  1331.               xver++;
  1332.             }
  1333.  
  1334.           /* Do some backend-specific processing on this symbol.  */
  1335.           if (ebd->elf_backend_symbol_processing)
  1336.             (*ebd->elf_backend_symbol_processing) (abfd, &sym->symbol);
  1337.         }
  1338.     }
  1339.  
  1340.   /* Do some backend-specific processing on this symbol table.  */
  1341.   if (ebd->elf_backend_symbol_table_processing)
  1342.     (*ebd->elf_backend_symbol_table_processing) (abfd, symbase, symcount);
  1343.  
  1344.   /* We rely on the zalloc to clear out the final symbol entry.  */
  1345.  
  1346.   symcount = sym - symbase;
  1347.  
  1348.   /* Fill in the user's symbol pointer vector if needed.  */
  1349.   if (symptrs)
  1350.     {
  1351.       long l = symcount;
  1352.  
  1353.       sym = symbase;
  1354.       while (l-- > 0)
  1355.         {
  1356.           *symptrs++ = &sym->symbol;
  1357.           sym++;
  1358.         }
  1359.       *symptrs = 0;             /* Final null pointer */
  1360.     }
  1361.  
  1362.   if (xverbuf != NULL)
  1363.     free (xverbuf);
  1364.   if (isymbuf != NULL && hdr->contents != (unsigned char *) isymbuf)
  1365.     free (isymbuf);
  1366.   return symcount;
  1367.  
  1368. error_return:
  1369.   if (xverbuf != NULL)
  1370.     free (xverbuf);
  1371.   if (isymbuf != NULL && hdr->contents != (unsigned char *) isymbuf)
  1372.     free (isymbuf);
  1373.   return -1;
  1374. }
  1375.  
  1376. /* Read relocations for ASECT from REL_HDR.  There are RELOC_COUNT of
  1377.    them.  */
  1378.  
  1379. static bfd_boolean
  1380. elf_slurp_reloc_table_from_section (bfd *abfd,
  1381.                                     asection *asect,
  1382.                                     Elf_Internal_Shdr *rel_hdr,
  1383.                                     bfd_size_type reloc_count,
  1384.                                     arelent *relents,
  1385.                                     asymbol **symbols,
  1386.                                     bfd_boolean dynamic)
  1387. {
  1388.   const struct elf_backend_data * const ebd = get_elf_backend_data (abfd);
  1389.   void *allocated = NULL;
  1390.   bfd_byte *native_relocs;
  1391.   arelent *relent;
  1392.   unsigned int i;
  1393.   int entsize;
  1394.   unsigned int symcount;
  1395.  
  1396.   allocated = bfd_malloc (rel_hdr->sh_size);
  1397.   if (allocated == NULL)
  1398.     goto error_return;
  1399.  
  1400.   if (bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0
  1401.       || (bfd_bread (allocated, rel_hdr->sh_size, abfd)
  1402.           != rel_hdr->sh_size))
  1403.     goto error_return;
  1404.  
  1405.   native_relocs = (bfd_byte *) allocated;
  1406.  
  1407.   entsize = rel_hdr->sh_entsize;
  1408.   BFD_ASSERT (entsize == sizeof (Elf_External_Rel)
  1409.               || entsize == sizeof (Elf_External_Rela));
  1410.  
  1411.   if (dynamic)
  1412.     symcount = bfd_get_dynamic_symcount (abfd);
  1413.   else
  1414.     symcount = bfd_get_symcount (abfd);
  1415.  
  1416.   for (i = 0, relent = relents;
  1417.        i < reloc_count;
  1418.        i++, relent++, native_relocs += entsize)
  1419.     {
  1420.       Elf_Internal_Rela rela;
  1421.  
  1422.       if (entsize == sizeof (Elf_External_Rela))
  1423.         elf_swap_reloca_in (abfd, native_relocs, &rela);
  1424.       else
  1425.         elf_swap_reloc_in (abfd, native_relocs, &rela);
  1426.  
  1427.       /* The address of an ELF reloc is section relative for an object
  1428.          file, and absolute for an executable file or shared library.
  1429.          The address of a normal BFD reloc is always section relative,
  1430.          and the address of a dynamic reloc is absolute..  */
  1431.       if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0 || dynamic)
  1432.         relent->address = rela.r_offset;
  1433.       else
  1434.         relent->address = rela.r_offset - asect->vma;
  1435.  
  1436.       if (ELF_R_SYM (rela.r_info) == STN_UNDEF)
  1437.         relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
  1438.       else if (ELF_R_SYM (rela.r_info) > symcount)
  1439.         {
  1440.           (*_bfd_error_handler)
  1441.             (_("%s(%s): relocation %d has invalid symbol index %ld"),
  1442.              abfd->filename, asect->name, i, ELF_R_SYM (rela.r_info));
  1443.           relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
  1444.         }
  1445.       else
  1446.         {
  1447.           asymbol **ps;
  1448.  
  1449.           ps = symbols + ELF_R_SYM (rela.r_info) - 1;
  1450.  
  1451.           relent->sym_ptr_ptr = ps;
  1452.         }
  1453.  
  1454.       relent->addend = rela.r_addend;
  1455.  
  1456.       if ((entsize == sizeof (Elf_External_Rela)
  1457.            && ebd->elf_info_to_howto != NULL)
  1458.           || ebd->elf_info_to_howto_rel == NULL)
  1459.         (*ebd->elf_info_to_howto) (abfd, relent, &rela);
  1460.       else
  1461.         (*ebd->elf_info_to_howto_rel) (abfd, relent, &rela);
  1462.     }
  1463.  
  1464.   if (allocated != NULL)
  1465.     free (allocated);
  1466.  
  1467.   return TRUE;
  1468.  
  1469.  error_return:
  1470.   if (allocated != NULL)
  1471.     free (allocated);
  1472.   return FALSE;
  1473. }
  1474.  
  1475. /* Read in and swap the external relocs.  */
  1476.  
  1477. bfd_boolean
  1478. elf_slurp_reloc_table (bfd *abfd,
  1479.                        asection *asect,
  1480.                        asymbol **symbols,
  1481.                        bfd_boolean dynamic)
  1482. {
  1483.   struct bfd_elf_section_data * const d = elf_section_data (asect);
  1484.   Elf_Internal_Shdr *rel_hdr;
  1485.   Elf_Internal_Shdr *rel_hdr2;
  1486.   bfd_size_type reloc_count;
  1487.   bfd_size_type reloc_count2;
  1488.   arelent *relents;
  1489.   bfd_size_type amt;
  1490.  
  1491.   if (asect->relocation != NULL)
  1492.     return TRUE;
  1493.  
  1494.   if (! dynamic)
  1495.     {
  1496.       if ((asect->flags & SEC_RELOC) == 0
  1497.           || asect->reloc_count == 0)
  1498.         return TRUE;
  1499.  
  1500.       rel_hdr = d->rel.hdr;
  1501.       reloc_count = rel_hdr ? NUM_SHDR_ENTRIES (rel_hdr) : 0;
  1502.       rel_hdr2 = d->rela.hdr;
  1503.       reloc_count2 = rel_hdr2 ? NUM_SHDR_ENTRIES (rel_hdr2) : 0;
  1504.  
  1505.       BFD_ASSERT (asect->reloc_count == reloc_count + reloc_count2);
  1506.       BFD_ASSERT ((rel_hdr && asect->rel_filepos == rel_hdr->sh_offset)
  1507.                   || (rel_hdr2 && asect->rel_filepos == rel_hdr2->sh_offset));
  1508.  
  1509.     }
  1510.   else
  1511.     {
  1512.       /* Note that ASECT->RELOC_COUNT tends not to be accurate in this
  1513.          case because relocations against this section may use the
  1514.          dynamic symbol table, and in that case bfd_section_from_shdr
  1515.          in elf.c does not update the RELOC_COUNT.  */
  1516.       if (asect->size == 0)
  1517.         return TRUE;
  1518.  
  1519.       rel_hdr = &d->this_hdr;
  1520.       reloc_count = NUM_SHDR_ENTRIES (rel_hdr);
  1521.       rel_hdr2 = NULL;
  1522.       reloc_count2 = 0;
  1523.     }
  1524.  
  1525.   amt = (reloc_count + reloc_count2) * sizeof (arelent);
  1526.   relents = (arelent *) bfd_alloc (abfd, amt);
  1527.   if (relents == NULL)
  1528.     return FALSE;
  1529.  
  1530.   if (rel_hdr
  1531.       && !elf_slurp_reloc_table_from_section (abfd, asect,
  1532.                                               rel_hdr, reloc_count,
  1533.                                               relents,
  1534.                                               symbols, dynamic))
  1535.     return FALSE;
  1536.  
  1537.   if (rel_hdr2
  1538.       && !elf_slurp_reloc_table_from_section (abfd, asect,
  1539.                                               rel_hdr2, reloc_count2,
  1540.                                               relents + reloc_count,
  1541.                                               symbols, dynamic))
  1542.     return FALSE;
  1543.  
  1544.   asect->relocation = relents;
  1545.   return TRUE;
  1546. }
  1547.  
  1548. #if DEBUG & 2
  1549. static void
  1550. elf_debug_section (int num, Elf_Internal_Shdr *hdr)
  1551. {
  1552.   fprintf (stderr, "\nSection#%d '%s' 0x%.8lx\n", num,
  1553.            hdr->bfd_section != NULL ? hdr->bfd_section->name : "",
  1554.            (long) hdr);
  1555.   fprintf (stderr,
  1556.            "sh_name      = %ld\tsh_type      = %ld\tsh_flags     = %ld\n",
  1557.            (long) hdr->sh_name,
  1558.            (long) hdr->sh_type,
  1559.            (long) hdr->sh_flags);
  1560.   fprintf (stderr,
  1561.            "sh_addr      = %ld\tsh_offset    = %ld\tsh_size      = %ld\n",
  1562.            (long) hdr->sh_addr,
  1563.            (long) hdr->sh_offset,
  1564.            (long) hdr->sh_size);
  1565.   fprintf (stderr,
  1566.            "sh_link      = %ld\tsh_info      = %ld\tsh_addralign = %ld\n",
  1567.            (long) hdr->sh_link,
  1568.            (long) hdr->sh_info,
  1569.            (long) hdr->sh_addralign);
  1570.   fprintf (stderr, "sh_entsize   = %ld\n",
  1571.            (long) hdr->sh_entsize);
  1572.   fflush (stderr);
  1573. }
  1574. #endif
  1575.  
  1576. #if DEBUG & 1
  1577. static void
  1578. elf_debug_file (Elf_Internal_Ehdr *ehdrp)
  1579. {
  1580.   fprintf (stderr, "e_entry      = 0x%.8lx\n", (long) ehdrp->e_entry);
  1581.   fprintf (stderr, "e_phoff      = %ld\n", (long) ehdrp->e_phoff);
  1582.   fprintf (stderr, "e_phnum      = %ld\n", (long) ehdrp->e_phnum);
  1583.   fprintf (stderr, "e_phentsize  = %ld\n", (long) ehdrp->e_phentsize);
  1584.   fprintf (stderr, "e_shoff      = %ld\n", (long) ehdrp->e_shoff);
  1585.   fprintf (stderr, "e_shnum      = %ld\n", (long) ehdrp->e_shnum);
  1586.   fprintf (stderr, "e_shentsize  = %ld\n", (long) ehdrp->e_shentsize);
  1587. }
  1588. #endif
  1590. /* Create a new BFD as if by bfd_openr.  Rather than opening a file,
  1591.    reconstruct an ELF file by reading the segments out of remote memory
  1592.    based on the ELF file header at EHDR_VMA and the ELF program headers it
  1593.    points to.  If not null, *LOADBASEP is filled in with the difference
  1594.    between the VMAs from which the segments were read, and the VMAs the
  1595.    file headers (and hence BFD's idea of each section's VMA) put them at.
  1596.  
  1597.    The function TARGET_READ_MEMORY is called to copy LEN bytes from the
  1598.    remote memory at target address VMA into the local buffer at MYADDR; it
  1599.    should return zero on success or an `errno' code on failure.  TEMPL must
  1600.    be a BFD for a target with the word size and byte order found in the
  1601.    remote memory.  */
  1602.  
  1603. bfd *
  1604. NAME(_bfd_elf,bfd_from_remote_memory)
  1605.   (bfd *templ,
  1606.    bfd_vma ehdr_vma,
  1607.    bfd_vma *loadbasep,
  1608.    int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type))
  1609. {
  1610.   Elf_External_Ehdr x_ehdr;     /* Elf file header, external form */
  1611.   Elf_Internal_Ehdr i_ehdr;     /* Elf file header, internal form */
  1612.   Elf_External_Phdr *x_phdrs;
  1613.   Elf_Internal_Phdr *i_phdrs, *last_phdr;
  1614.   bfd *nbfd;
  1615.   struct bfd_in_memory *bim;
  1616.   int contents_size;
  1617.   bfd_byte *contents;
  1618.   int err;
  1619.   unsigned int i;
  1620.   bfd_vma loadbase;
  1621.   bfd_boolean loadbase_set;
  1622.  
  1623.   /* Read in the ELF header in external format.  */
  1624.   err = target_read_memory (ehdr_vma, (bfd_byte *) &x_ehdr, sizeof x_ehdr);
  1625.   if (err)
  1626.     {
  1627.       bfd_set_error (bfd_error_system_call);
  1628.       errno = err;
  1629.       return NULL;
  1630.     }
  1631.  
  1632.   /* Now check to see if we have a valid ELF file, and one that BFD can
  1633.      make use of.  The magic number must match, the address size ('class')
  1634.      and byte-swapping must match our XVEC entry.  */
  1635.  
  1636.   if (! elf_file_p (&x_ehdr)
  1637.       || x_ehdr.e_ident[EI_VERSION] != EV_CURRENT
  1638.       || x_ehdr.e_ident[EI_CLASS] != ELFCLASS)
  1639.     {
  1640.       bfd_set_error (bfd_error_wrong_format);
  1641.       return NULL;
  1642.     }
  1643.  
  1644.   /* Check that file's byte order matches xvec's */
  1645.   switch (x_ehdr.e_ident[EI_DATA])
  1646.     {
  1647.     case ELFDATA2MSB:           /* Big-endian */
  1648.       if (! bfd_header_big_endian (templ))
  1649.         {
  1650.           bfd_set_error (bfd_error_wrong_format);
  1651.           return NULL;
  1652.         }
  1653.       break;
  1654.     case ELFDATA2LSB:           /* Little-endian */
  1655.       if (! bfd_header_little_endian (templ))
  1656.         {
  1657.           bfd_set_error (bfd_error_wrong_format);
  1658.           return NULL;
  1659.         }
  1660.       break;
  1661.     case ELFDATANONE:           /* No data encoding specified */
  1662.     default:                    /* Unknown data encoding specified */
  1663.       bfd_set_error (bfd_error_wrong_format);
  1664.       return NULL;
  1665.     }
  1666.  
  1667.   elf_swap_ehdr_in (templ, &x_ehdr, &i_ehdr);
  1668.  
  1669.   /* The file header tells where to find the program headers.
  1670.      These are what we use to actually choose what to read.  */
  1671.  
  1672.   if (i_ehdr.e_phentsize != sizeof (Elf_External_Phdr) || i_ehdr.e_phnum == 0)
  1673.     {
  1674.       bfd_set_error (bfd_error_wrong_format);
  1675.       return NULL;
  1676.     }
  1677.  
  1678.   x_phdrs = (Elf_External_Phdr *)
  1679.       bfd_malloc (i_ehdr.e_phnum * (sizeof *x_phdrs + sizeof *i_phdrs));
  1680.   if (x_phdrs == NULL)
  1681.     {
  1682.       bfd_set_error (bfd_error_no_memory);
  1683.       return NULL;
  1684.     }
  1685.   err = target_read_memory (ehdr_vma + i_ehdr.e_phoff, (bfd_byte *) x_phdrs,
  1686.                             i_ehdr.e_phnum * sizeof x_phdrs[0]);
  1687.   if (err)
  1688.     {
  1689.       free (x_phdrs);
  1690.       bfd_set_error (bfd_error_system_call);
  1691.       errno = err;
  1692.       return NULL;
  1693.     }
  1694.   i_phdrs = (Elf_Internal_Phdr *) &x_phdrs[i_ehdr.e_phnum];
  1695.  
  1696.   contents_size = 0;
  1697.   last_phdr = NULL;
  1698.   loadbase = ehdr_vma;
  1699.   loadbase_set = FALSE;
  1700.   for (i = 0; i < i_ehdr.e_phnum; ++i)
  1701.     {
  1702.       elf_swap_phdr_in (templ, &x_phdrs[i], &i_phdrs[i]);
  1703.       if (i_phdrs[i].p_type == PT_LOAD)
  1704.         {
  1705.           bfd_vma segment_end;
  1706.           segment_end = (i_phdrs[i].p_offset + i_phdrs[i].p_filesz
  1707.                          + i_phdrs[i].p_align - 1) & -i_phdrs[i].p_align;
  1708.           if (segment_end > (bfd_vma) contents_size)
  1709.             contents_size = segment_end;
  1710.  
  1711.           /* LOADADDR is the `Base address' from the gELF specification:
  1712.              `lowest p_vaddr value for a PT_LOAD segment' is P_VADDR from the
  1713.              first PT_LOAD as PT_LOADs are ordered by P_VADDR.  */
  1714.           if (!loadbase_set && (i_phdrs[i].p_offset & -i_phdrs[i].p_align) == 0)
  1715.             {
  1716.               loadbase = ehdr_vma - (i_phdrs[i].p_vaddr & -i_phdrs[i].p_align);
  1717.               loadbase_set = TRUE;
  1718.             }
  1719.  
  1720.           last_phdr = &i_phdrs[i];
  1721.         }
  1722.     }
  1723.   if (last_phdr == NULL)
  1724.     {
  1725.       /* There were no PT_LOAD segments, so we don't have anything to read.  */
  1726.       free (x_phdrs);
  1727.       bfd_set_error (bfd_error_wrong_format);
  1728.       return NULL;
  1729.     }
  1730.  
  1731.   /* Trim the last segment so we don't bother with zeros in the last page
  1732.      that are off the end of the file.  However, if the extra bit in that
  1733.      page includes the section headers, keep them.  */
  1734.   if ((bfd_vma) contents_size > last_phdr->p_offset + last_phdr->p_filesz
  1735.       && (bfd_vma) contents_size >= (i_ehdr.e_shoff
  1736.                                      + i_ehdr.e_shnum * i_ehdr.e_shentsize))
  1737.     {
  1738.       contents_size = last_phdr->p_offset + last_phdr->p_filesz;
  1739.       if ((bfd_vma) contents_size < (i_ehdr.e_shoff
  1740.                                      + i_ehdr.e_shnum * i_ehdr.e_shentsize))
  1741.         contents_size = i_ehdr.e_shoff + i_ehdr.e_shnum * i_ehdr.e_shentsize;
  1742.     }
  1743.   else
  1744.     contents_size = last_phdr->p_offset + last_phdr->p_filesz;
  1745.  
  1746.   /* Now we know the size of the whole image we want read in.  */
  1747.   contents = (bfd_byte *) bfd_zmalloc (contents_size);
  1748.   if (contents == NULL)
  1749.     {
  1750.       free (x_phdrs);
  1751.       bfd_set_error (bfd_error_no_memory);
  1752.       return NULL;
  1753.     }
  1754.  
  1755.   for (i = 0; i < i_ehdr.e_phnum; ++i)
  1756.     if (i_phdrs[i].p_type == PT_LOAD)
  1757.       {
  1758.         bfd_vma start = i_phdrs[i].p_offset & -i_phdrs[i].p_align;
  1759.         bfd_vma end = (i_phdrs[i].p_offset + i_phdrs[i].p_filesz
  1760.                        + i_phdrs[i].p_align - 1) & -i_phdrs[i].p_align;
  1761.         if (end > (bfd_vma) contents_size)
  1762.           end = contents_size;
  1763.         err = target_read_memory ((loadbase + i_phdrs[i].p_vaddr)
  1764.                                   & -i_phdrs[i].p_align,
  1765.                                   contents + start, end - start);
  1766.         if (err)
  1767.           {
  1768.             free (x_phdrs);
  1769.             free (contents);
  1770.             bfd_set_error (bfd_error_system_call);
  1771.             errno = err;
  1772.             return NULL;
  1773.           }
  1774.       }
  1775.   free (x_phdrs);
  1776.  
  1777.   /* If the segments visible in memory didn't include the section headers,
  1778.      then clear them from the file header.  */
  1779.   if ((bfd_vma) contents_size < (i_ehdr.e_shoff
  1780.                                  + i_ehdr.e_shnum * i_ehdr.e_shentsize))
  1781.     {
  1782.       memset (&x_ehdr.e_shoff, 0, sizeof x_ehdr.e_shoff);
  1783.       memset (&x_ehdr.e_shnum, 0, sizeof x_ehdr.e_shnum);
  1784.       memset (&x_ehdr.e_shstrndx, 0, sizeof x_ehdr.e_shstrndx);
  1785.     }
  1786.  
  1787.   /* This will normally have been in the first PT_LOAD segment.  But it
  1788.      conceivably could be missing, and we might have just changed it.  */
  1789.   memcpy (contents, &x_ehdr, sizeof x_ehdr);
  1790.  
  1791.   /* Now we have a memory image of the ELF file contents.  Make a BFD.  */
  1792.   bim = (struct bfd_in_memory *) bfd_malloc (sizeof (struct bfd_in_memory));
  1793.   if (bim == NULL)
  1794.     {
  1795.       free (contents);
  1796.       bfd_set_error (bfd_error_no_memory);
  1797.       return NULL;
  1798.     }
  1799.   nbfd = _bfd_new_bfd ();
  1800.   if (nbfd == NULL)
  1801.     {
  1802.       free (bim);
  1803.       free (contents);
  1804.       bfd_set_error (bfd_error_no_memory);
  1805.       return NULL;
  1806.     }
  1807.   nbfd->filename = "<in-memory>";
  1808.   nbfd->xvec = templ->xvec;
  1809.   bim->size = contents_size;
  1810.   bim->buffer = contents;
  1811.   nbfd->iostream = bim;
  1812.   nbfd->flags = BFD_IN_MEMORY;
  1813.   nbfd->iovec = &_bfd_memory_iovec;
  1814.   nbfd->origin = 0;
  1815.   nbfd->direction = read_direction;
  1816.   nbfd->mtime = time (NULL);
  1817.   nbfd->mtime_set = TRUE;
  1818.  
  1819.   if (loadbasep)
  1820.     *loadbasep = loadbase;
  1821.   return nbfd;
  1822. }
  1823.  
  1824. /* Function for ELF_R_INFO.  */
  1825.  
  1826. bfd_vma
  1827. NAME(elf,r_info) (bfd_vma sym, bfd_vma type)
  1828. {
  1829.   return ELF_R_INFO (sym, type);
  1830. }
  1831.  
  1832. /* Function for ELF_R_SYM.  */
  1833.  
  1834. bfd_vma
  1835. NAME(elf,r_sym) (bfd_vma r_info)
  1836. {
  1837.   return ELF_R_SYM (r_info);
  1838. }
  1840. #include "elfcore.h"
  1842. /* Size-dependent data and functions.  */
  1843. const struct elf_size_info NAME(_bfd_elf,size_info) = {
  1844.   sizeof (Elf_External_Ehdr),
  1845.   sizeof (Elf_External_Phdr),
  1846.   sizeof (Elf_External_Shdr),
  1847.   sizeof (Elf_External_Rel),
  1848.   sizeof (Elf_External_Rela),
  1849.   sizeof (Elf_External_Sym),
  1850.   sizeof (Elf_External_Dyn),
  1851.   sizeof (Elf_External_Note),
  1852.   4,
  1853.   1,
  1854.   ARCH_SIZE, LOG_FILE_ALIGN,
  1855.   ELFCLASS, EV_CURRENT,
  1856.   elf_write_out_phdrs,
  1857.   elf_write_shdrs_and_ehdr,
  1858.   elf_checksum_contents,
  1859.   elf_write_relocs,
  1860.   elf_swap_symbol_in,
  1861.   elf_swap_symbol_out,
  1862.   elf_slurp_reloc_table,
  1863.   elf_slurp_symbol_table,
  1864.   elf_swap_dyn_in,
  1865.   elf_swap_dyn_out,
  1866.   elf_swap_reloc_in,
  1867.   elf_swap_reloc_out,
  1868.   elf_swap_reloca_in,
  1869.   elf_swap_reloca_out
  1870. };
  1871.