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gnu / binutils-gdb / c3f118876af79d1ce51765860684bf17effeaef3 / . / bfd / elf.c
blob: f98b49caf20cfd7e9ce6c183f1abac2ce19bd716 [file] [log] [blame]
/* ELF executable support for BFD.
Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
Free Software Foundation, Inc.
This file is part of BFD, the Binary File Descriptor library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/*
SECTION
ELF backends
BFD support for ELF formats is being worked on.
Currently, the best supported back ends are for sparc and i386
(running svr4 or Solaris 2).
Documentation of the internals of the support code still needs
to be written. The code is changing quickly enough that we
haven't bothered yet.
*/
/* For sparc64-cross-sparc32. */
#define _SYSCALL32
#include "bfd.h"
#include "sysdep.h"
#include "bfdlink.h"
#include "libbfd.h"
#define ARCH_SIZE 0
#include "elf-bfd.h"
static INLINE struct elf_segment_map *make_mapping
PARAMS ((bfd *, asection **, unsigned int, unsigned int, boolean));
static boolean map_sections_to_segments PARAMS ((bfd *));
static int elf_sort_sections PARAMS ((const PTR, const PTR));
static boolean assign_file_positions_for_segments PARAMS ((bfd *));
static boolean assign_file_positions_except_relocs PARAMS ((bfd *));
static boolean prep_headers PARAMS ((bfd *));
static boolean swap_out_syms PARAMS ((bfd *, struct bfd_strtab_hash **, int));
static boolean copy_private_bfd_data PARAMS ((bfd *, bfd *));
static char *elf_read PARAMS ((bfd *, long, unsigned int));
static void elf_fake_sections PARAMS ((bfd *, asection *, PTR));
static boolean assign_section_numbers PARAMS ((bfd *));
static INLINE int sym_is_global PARAMS ((bfd *, asymbol *));
static boolean elf_map_symbols PARAMS ((bfd *));
static bfd_size_type get_program_header_size PARAMS ((bfd *));
static boolean elfcore_read_notes PARAMS ((bfd *, bfd_vma, bfd_vma));
static boolean elf_find_function PARAMS ((bfd *, asection *,
asymbol **,
bfd_vma, const char **,
const char **));
/* Swap version information in and out. The version information is
currently size independent. If that ever changes, this code will
need to move into elfcode.h. */
/* Swap in a Verdef structure. */
void
_bfd_elf_swap_verdef_in (abfd, src, dst)
bfd *abfd;
const Elf_External_Verdef *src;
Elf_Internal_Verdef *dst;
{
dst->vd_version = bfd_h_get_16 (abfd, src->vd_version);
dst->vd_flags = bfd_h_get_16 (abfd, src->vd_flags);
dst->vd_ndx = bfd_h_get_16 (abfd, src->vd_ndx);
dst->vd_cnt = bfd_h_get_16 (abfd, src->vd_cnt);
dst->vd_hash = bfd_h_get_32 (abfd, src->vd_hash);
dst->vd_aux = bfd_h_get_32 (abfd, src->vd_aux);
dst->vd_next = bfd_h_get_32 (abfd, src->vd_next);
}
/* Swap out a Verdef structure. */
void
_bfd_elf_swap_verdef_out (abfd, src, dst)
bfd *abfd;
const Elf_Internal_Verdef *src;
Elf_External_Verdef *dst;
{
bfd_h_put_16 (abfd, src->vd_version, dst->vd_version);
bfd_h_put_16 (abfd, src->vd_flags, dst->vd_flags);
bfd_h_put_16 (abfd, src->vd_ndx, dst->vd_ndx);
bfd_h_put_16 (abfd, src->vd_cnt, dst->vd_cnt);
bfd_h_put_32 (abfd, src->vd_hash, dst->vd_hash);
bfd_h_put_32 (abfd, src->vd_aux, dst->vd_aux);
bfd_h_put_32 (abfd, src->vd_next, dst->vd_next);
}
/* Swap in a Verdaux structure. */
void
_bfd_elf_swap_verdaux_in (abfd, src, dst)
bfd *abfd;
const Elf_External_Verdaux *src;
Elf_Internal_Verdaux *dst;
{
dst->vda_name = bfd_h_get_32 (abfd, src->vda_name);
dst->vda_next = bfd_h_get_32 (abfd, src->vda_next);
}
/* Swap out a Verdaux structure. */
void
_bfd_elf_swap_verdaux_out (abfd, src, dst)
bfd *abfd;
const Elf_Internal_Verdaux *src;
Elf_External_Verdaux *dst;
{
bfd_h_put_32 (abfd, src->vda_name, dst->vda_name);
bfd_h_put_32 (abfd, src->vda_next, dst->vda_next);
}
/* Swap in a Verneed structure. */
void
_bfd_elf_swap_verneed_in (abfd, src, dst)
bfd *abfd;
const Elf_External_Verneed *src;
Elf_Internal_Verneed *dst;
{
dst->vn_version = bfd_h_get_16 (abfd, src->vn_version);
dst->vn_cnt = bfd_h_get_16 (abfd, src->vn_cnt);
dst->vn_file = bfd_h_get_32 (abfd, src->vn_file);
dst->vn_aux = bfd_h_get_32 (abfd, src->vn_aux);
dst->vn_next = bfd_h_get_32 (abfd, src->vn_next);
}
/* Swap out a Verneed structure. */
void
_bfd_elf_swap_verneed_out (abfd, src, dst)
bfd *abfd;
const Elf_Internal_Verneed *src;
Elf_External_Verneed *dst;
{
bfd_h_put_16 (abfd, src->vn_version, dst->vn_version);
bfd_h_put_16 (abfd, src->vn_cnt, dst->vn_cnt);
bfd_h_put_32 (abfd, src->vn_file, dst->vn_file);
bfd_h_put_32 (abfd, src->vn_aux, dst->vn_aux);
bfd_h_put_32 (abfd, src->vn_next, dst->vn_next);
}
/* Swap in a Vernaux structure. */
void
_bfd_elf_swap_vernaux_in (abfd, src, dst)
bfd *abfd;
const Elf_External_Vernaux *src;
Elf_Internal_Vernaux *dst;
{
dst->vna_hash = bfd_h_get_32 (abfd, src->vna_hash);
dst->vna_flags = bfd_h_get_16 (abfd, src->vna_flags);
dst->vna_other = bfd_h_get_16 (abfd, src->vna_other);
dst->vna_name = bfd_h_get_32 (abfd, src->vna_name);
dst->vna_next = bfd_h_get_32 (abfd, src->vna_next);
}
/* Swap out a Vernaux structure. */
void
_bfd_elf_swap_vernaux_out (abfd, src, dst)
bfd *abfd;
const Elf_Internal_Vernaux *src;
Elf_External_Vernaux *dst;
{
bfd_h_put_32 (abfd, src->vna_hash, dst->vna_hash);
bfd_h_put_16 (abfd, src->vna_flags, dst->vna_flags);
bfd_h_put_16 (abfd, src->vna_other, dst->vna_other);
bfd_h_put_32 (abfd, src->vna_name, dst->vna_name);
bfd_h_put_32 (abfd, src->vna_next, dst->vna_next);
}
/* Swap in a Versym structure. */
void
_bfd_elf_swap_versym_in (abfd, src, dst)
bfd *abfd;
const Elf_External_Versym *src;
Elf_Internal_Versym *dst;
{
dst->vs_vers = bfd_h_get_16 (abfd, src->vs_vers);
}
/* Swap out a Versym structure. */
void
_bfd_elf_swap_versym_out (abfd, src, dst)
bfd *abfd;
const Elf_Internal_Versym *src;
Elf_External_Versym *dst;
{
bfd_h_put_16 (abfd, src->vs_vers, dst->vs_vers);
}
/* Standard ELF hash function. Do not change this function; you will
cause invalid hash tables to be generated. */
unsigned long
bfd_elf_hash (namearg)
const char *namearg;
{
const unsigned char *name = (const unsigned char *) namearg;
unsigned long h = 0;
unsigned long g;
int ch;
while ((ch = *name++) != '\0')
{
h = (h << 4) + ch;
if ((g = (h & 0xf0000000)) != 0)
{
h ^= g >> 24;
/* The ELF ABI says `h &= ~g', but this is equivalent in
this case and on some machines one insn instead of two. */
h ^= g;
}
}
return h;
}
/* Read a specified number of bytes at a specified offset in an ELF
file, into a newly allocated buffer, and return a pointer to the
buffer. */
static char *
elf_read (abfd, offset, size)
bfd *abfd;
long offset;
unsigned int size;
{
char *buf;
if ((buf = bfd_alloc (abfd, size)) == NULL)
return NULL;
if (bfd_seek (abfd, offset, SEEK_SET) == -1)
return NULL;
if (bfd_read ((PTR) buf, size, 1, abfd) != size)
{
if (bfd_get_error () != bfd_error_system_call)
bfd_set_error (bfd_error_file_truncated);
return NULL;
}
return buf;
}
boolean
bfd_elf_mkobject (abfd)
bfd *abfd;
{
/* This just does initialization. */
/* coff_mkobject zalloc's space for tdata.coff_obj_data ... */
elf_tdata (abfd) = (struct elf_obj_tdata *)
bfd_zalloc (abfd, sizeof (struct elf_obj_tdata));
if (elf_tdata (abfd) == 0)
return false;
/* Since everything is done at close time, do we need any
initialization? */
return true;
}
boolean
bfd_elf_mkcorefile (abfd)
bfd *abfd;
{
/* I think this can be done just like an object file. */
return bfd_elf_mkobject (abfd);
}
char *
bfd_elf_get_str_section (abfd, shindex)
bfd *abfd;
unsigned int shindex;
{
Elf_Internal_Shdr **i_shdrp;
char *shstrtab = NULL;
unsigned int offset;
unsigned int shstrtabsize;
i_shdrp = elf_elfsections (abfd);
if (i_shdrp == 0 || i_shdrp[shindex] == 0)
return 0;
shstrtab = (char *) i_shdrp[shindex]->contents;
if (shstrtab == NULL)
{
/* No cached one, attempt to read, and cache what we read. */
offset = i_shdrp[shindex]->sh_offset;
shstrtabsize = i_shdrp[shindex]->sh_size;
shstrtab = elf_read (abfd, offset, shstrtabsize);
i_shdrp[shindex]->contents = (PTR) shstrtab;
}
return shstrtab;
}
char *
bfd_elf_string_from_elf_section (abfd, shindex, strindex)
bfd *abfd;
unsigned int shindex;
unsigned int strindex;
{
Elf_Internal_Shdr *hdr;
if (strindex == 0)
return "";
hdr = elf_elfsections (abfd)[shindex];
if (hdr->contents == NULL
&& bfd_elf_get_str_section (abfd, shindex) == NULL)
return NULL;
if (strindex >= hdr->sh_size)
{
(*_bfd_error_handler)
(_("%s: invalid string offset %u >= %lu for section `%s'"),
bfd_get_filename (abfd), strindex, (unsigned long) hdr->sh_size,
((shindex == elf_elfheader(abfd)->e_shstrndx
&& strindex == hdr->sh_name)
? ".shstrtab"
: elf_string_from_elf_strtab (abfd, hdr->sh_name)));
return "";
}
return ((char *) hdr->contents) + strindex;
}
/* Make a BFD section from an ELF section. We store a pointer to the
BFD section in the bfd_section field of the header. */
boolean
_bfd_elf_make_section_from_shdr (abfd, hdr, name)
bfd *abfd;
Elf_Internal_Shdr *hdr;
const char *name;
{
asection *newsect;
flagword flags;
struct elf_backend_data *bed;
if (hdr->bfd_section != NULL)
{
BFD_ASSERT (strcmp (name,
bfd_get_section_name (abfd, hdr->bfd_section)) == 0);
return true;
}
newsect = bfd_make_section_anyway (abfd, name);
if (newsect == NULL)
return false;
newsect->filepos = hdr->sh_offset;
if (! bfd_set_section_vma (abfd, newsect, hdr->sh_addr)
|| ! bfd_set_section_size (abfd, newsect, hdr->sh_size)
|| ! bfd_set_section_alignment (abfd, newsect,
bfd_log2 (hdr->sh_addralign)))
return false;
flags = SEC_NO_FLAGS;
if (hdr->sh_type != SHT_NOBITS)
flags |= SEC_HAS_CONTENTS;
if ((hdr->sh_flags & SHF_ALLOC) != 0)
{
flags |= SEC_ALLOC;
if (hdr->sh_type != SHT_NOBITS)
flags |= SEC_LOAD;
}
if ((hdr->sh_flags & SHF_WRITE) == 0)
flags |= SEC_READONLY;
if ((hdr->sh_flags & SHF_EXECINSTR) != 0)
flags |= SEC_CODE;
else if ((flags & SEC_LOAD) != 0)
flags |= SEC_DATA;
/* The debugging sections appear to be recognized only by name, not
any sort of flag. */
{
static const char *debug_sec_names [] =
{
".debug",
".gnu.linkonce.wi.",
".line",
".stab"
};
int i;
for (i = sizeof (debug_sec_names) / sizeof (debug_sec_names[0]); i--;)
if (strncmp (name, debug_sec_names[i], strlen (debug_sec_names[i])) == 0)
break;
if (i >= 0)
flags |= SEC_DEBUGGING;
}
/* As a GNU extension, if the name begins with .gnu.linkonce, we
only link a single copy of the section. This is used to support
g++. g++ will emit each template expansion in its own section.
The symbols will be defined as weak, so that multiple definitions
are permitted. The GNU linker extension is to actually discard
all but one of the sections. */
if (strncmp (name, ".gnu.linkonce", sizeof ".gnu.linkonce" - 1) == 0)
flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD;
bed = get_elf_backend_data (abfd);
if (bed->elf_backend_section_flags)
if (! bed->elf_backend_section_flags (&flags, hdr))
return false;
if (! bfd_set_section_flags (abfd, newsect, flags))
return false;
if ((flags & SEC_ALLOC) != 0)
{
Elf_Internal_Phdr *phdr;
unsigned int i;
/* Look through the phdrs to see if we need to adjust the lma.
If all the p_paddr fields are zero, we ignore them, since
some ELF linkers produce such output. */
phdr = elf_tdata (abfd)->phdr;
for (i = 0; i < elf_elfheader (abfd)->e_phnum; i++, phdr++)
{
if (phdr->p_paddr != 0)
break;
}
if (i < elf_elfheader (abfd)->e_phnum)
{
phdr = elf_tdata (abfd)->phdr;
for (i = 0; i < elf_elfheader (abfd)->e_phnum; i++, phdr++)
{
if (phdr->p_type == PT_LOAD
&& phdr->p_vaddr != phdr->p_paddr
&& phdr->p_vaddr <= hdr->sh_addr
&& (phdr->p_vaddr + phdr->p_memsz
>= hdr->sh_addr + hdr->sh_size)
&& ((flags & SEC_LOAD) == 0
|| (phdr->p_offset <= (bfd_vma) hdr->sh_offset
&& (phdr->p_offset + phdr->p_filesz
>= hdr->sh_offset + hdr->sh_size))))
{
newsect->lma += phdr->p_paddr - phdr->p_vaddr;
break;
}
}
}
}
hdr->bfd_section = newsect;
elf_section_data (newsect)->this_hdr = *hdr;
return true;
}
/*
INTERNAL_FUNCTION
bfd_elf_find_section
SYNOPSIS
struct elf_internal_shdr *bfd_elf_find_section (bfd *abfd, char *name);
DESCRIPTION
Helper functions for GDB to locate the string tables.
Since BFD hides string tables from callers, GDB needs to use an
internal hook to find them. Sun's .stabstr, in particular,
isn't even pointed to by the .stab section, so ordinary
mechanisms wouldn't work to find it, even if we had some.
*/
struct elf_internal_shdr *
bfd_elf_find_section (abfd, name)
bfd *abfd;
char *name;
{
Elf_Internal_Shdr **i_shdrp;
char *shstrtab;
unsigned int max;
unsigned int i;
i_shdrp = elf_elfsections (abfd);
if (i_shdrp != NULL)
{
shstrtab = bfd_elf_get_str_section
(abfd, elf_elfheader (abfd)->e_shstrndx);
if (shstrtab != NULL)
{
max = elf_elfheader (abfd)->e_shnum;
for (i = 1; i < max; i++)
if (!strcmp (&shstrtab[i_shdrp[i]->sh_name], name))
return i_shdrp[i];
}
}
return 0;
}
const char *const bfd_elf_section_type_names[] = {
"SHT_NULL", "SHT_PROGBITS", "SHT_SYMTAB", "SHT_STRTAB",
"SHT_RELA", "SHT_HASH", "SHT_DYNAMIC", "SHT_NOTE",
"SHT_NOBITS", "SHT_REL", "SHT_SHLIB", "SHT_DYNSYM",
};
/* ELF relocs are against symbols. If we are producing relocateable
output, and the reloc is against an external symbol, and nothing
has given us any additional addend, the resulting reloc will also
be against the same symbol. In such a case, we don't want to
change anything about the way the reloc is handled, since it will
all be done at final link time. Rather than put special case code
into bfd_perform_relocation, all the reloc types use this howto
function. It just short circuits the reloc if producing
relocateable output against an external symbol. */
bfd_reloc_status_type
bfd_elf_generic_reloc (abfd,
reloc_entry,
symbol,
data,
input_section,
output_bfd,
error_message)
bfd *abfd ATTRIBUTE_UNUSED;
arelent *reloc_entry;
asymbol *symbol;
PTR data ATTRIBUTE_UNUSED;
asection *input_section;
bfd *output_bfd;
char **error_message ATTRIBUTE_UNUSED;
{
if (output_bfd != (bfd *) NULL
&& (symbol->flags & BSF_SECTION_SYM) == 0
&& (! reloc_entry->howto->partial_inplace
|| reloc_entry->addend == 0))
{
reloc_entry->address += input_section->output_offset;
return bfd_reloc_ok;
}
return bfd_reloc_continue;
}
/* Print out the program headers. */
boolean
_bfd_elf_print_private_bfd_data (abfd, farg)
bfd *abfd;
PTR farg;
{
FILE *f = (FILE *) farg;
Elf_Internal_Phdr *p;
asection *s;
bfd_byte *dynbuf = NULL;
p = elf_tdata (abfd)->phdr;
if (p != NULL)
{
unsigned int i, c;
fprintf (f, _("\nProgram Header:\n"));
c = elf_elfheader (abfd)->e_phnum;
for (i = 0; i < c; i++, p++)
{
const char *s;
char buf[20];
switch (p->p_type)
{
case PT_NULL: s = "NULL"; break;
case PT_LOAD: s = "LOAD"; break;
case PT_DYNAMIC: s = "DYNAMIC"; break;
case PT_INTERP: s = "INTERP"; break;
case PT_NOTE: s = "NOTE"; break;
case PT_SHLIB: s = "SHLIB"; break;
case PT_PHDR: s = "PHDR"; break;
default: sprintf (buf, "0x%lx", p->p_type); s = buf; break;
}
fprintf (f, "%8s off 0x", s);
fprintf_vma (f, p->p_offset);
fprintf (f, " vaddr 0x");
fprintf_vma (f, p->p_vaddr);
fprintf (f, " paddr 0x");
fprintf_vma (f, p->p_paddr);
fprintf (f, " align 2**%u\n", bfd_log2 (p->p_align));
fprintf (f, " filesz 0x");
fprintf_vma (f, p->p_filesz);
fprintf (f, " memsz 0x");
fprintf_vma (f, p->p_memsz);
fprintf (f, " flags %c%c%c",
(p->p_flags & PF_R) != 0 ? 'r' : '-',
(p->p_flags & PF_W) != 0 ? 'w' : '-',
(p->p_flags & PF_X) != 0 ? 'x' : '-');
if ((p->p_flags &~ (PF_R | PF_W | PF_X)) != 0)
fprintf (f, " %lx", p->p_flags &~ (PF_R | PF_W | PF_X));
fprintf (f, "\n");
}
}
s = bfd_get_section_by_name (abfd, ".dynamic");
if (s != NULL)
{
int elfsec;
unsigned long link;
bfd_byte *extdyn, *extdynend;
size_t extdynsize;
void (*swap_dyn_in) PARAMS ((bfd *, const PTR, Elf_Internal_Dyn *));
fprintf (f, _("\nDynamic Section:\n"));
dynbuf = (bfd_byte *) bfd_malloc (s->_raw_size);
if (dynbuf == NULL)
goto error_return;
if (! bfd_get_section_contents (abfd, s, (PTR) dynbuf, (file_ptr) 0,
s->_raw_size))
goto error_return;
elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
if (elfsec == -1)
goto error_return;
link = elf_elfsections (abfd)[elfsec]->sh_link;
extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
extdyn = dynbuf;
extdynend = extdyn + s->_raw_size;
for (; extdyn < extdynend; extdyn += extdynsize)
{
Elf_Internal_Dyn dyn;
const char *name;
char ab[20];
boolean stringp;
(*swap_dyn_in) (abfd, (PTR) extdyn, &dyn);
if (dyn.d_tag == DT_NULL)
break;
stringp = false;
switch (dyn.d_tag)
{
default:
sprintf (ab, "0x%lx", (unsigned long) dyn.d_tag);
name = ab;
break;
case DT_NEEDED: name = "NEEDED"; stringp = true; break;
case DT_PLTRELSZ: name = "PLTRELSZ"; break;
case DT_PLTGOT: name = "PLTGOT"; break;
case DT_HASH: name = "HASH"; break;
case DT_STRTAB: name = "STRTAB"; break;
case DT_SYMTAB: name = "SYMTAB"; break;
case DT_RELA: name = "RELA"; break;
case DT_RELASZ: name = "RELASZ"; break;
case DT_RELAENT: name = "RELAENT"; break;
case DT_STRSZ: name = "STRSZ"; break;
case DT_SYMENT: name = "SYMENT"; break;
case DT_INIT: name = "INIT"; break;
case DT_FINI: name = "FINI"; break;
case DT_SONAME: name = "SONAME"; stringp = true; break;
case DT_RPATH: name = "RPATH"; stringp = true; break;
case DT_SYMBOLIC: name = "SYMBOLIC"; break;
case DT_REL: name = "REL"; break;
case DT_RELSZ: name = "RELSZ"; break;
case DT_RELENT: name = "RELENT"; break;
case DT_PLTREL: name = "PLTREL"; break;
case DT_DEBUG: name = "DEBUG"; break;
case DT_TEXTREL: name = "TEXTREL"; break;
case DT_JMPREL: name = "JMPREL"; break;
case DT_BIND_NOW: name = "BIND_NOW"; break;
case DT_INIT_ARRAY: name = "INIT_ARRAY"; break;
case DT_FINI_ARRAY: name = "FINI_ARRAY"; break;
case DT_INIT_ARRAYSZ: name = "INIT_ARRAYSZ"; break;
case DT_FINI_ARRAYSZ: name = "FINI_ARRAYSZ"; break;
case DT_RUNPATH: name = "RUNPATH"; stringp = true; break;
case DT_FLAGS: name = "FLAGS"; break;
case DT_PREINIT_ARRAY: name = "PREINIT_ARRAY"; break;
case DT_PREINIT_ARRAYSZ: name = "PREINIT_ARRAYSZ"; break;
case DT_CHECKSUM: name = "CHECKSUM"; break;
case DT_PLTPADSZ: name = "PLTPADSZ"; break;
case DT_MOVEENT: name = "MOVEENT"; break;
case DT_MOVESZ: name = "MOVESZ"; break;
case DT_FEATURE: name = "FEATURE"; break;
case DT_POSFLAG_1: name = "POSFLAG_1"; break;
case DT_SYMINSZ: name = "SYMINSZ"; break;
case DT_SYMINENT: name = "SYMINENT"; break;
case DT_CONFIG: name = "CONFIG"; stringp = true; break;
case DT_DEPAUDIT: name = "DEPAUDIT"; stringp = true; break;
case DT_AUDIT: name = "AUDIT"; stringp = true; break;
case DT_PLTPAD: name = "PLTPAD"; break;
case DT_MOVETAB: name = "MOVETAB"; break;
case DT_SYMINFO: name = "SYMINFO"; break;
case DT_RELACOUNT: name = "RELACOUNT"; break;
case DT_RELCOUNT: name = "RELCOUNT"; break;
case DT_FLAGS_1: name = "FLAGS_1"; break;
case DT_VERSYM: name = "VERSYM"; break;
case DT_VERDEF: name = "VERDEF"; break;
case DT_VERDEFNUM: name = "VERDEFNUM"; break;
case DT_VERNEED: name = "VERNEED"; break;
case DT_VERNEEDNUM: name = "VERNEEDNUM"; break;
case DT_AUXILIARY: name = "AUXILIARY"; stringp = true; break;
case DT_USED: name = "USED"; break;
case DT_FILTER: name = "FILTER"; stringp = true; break;
}
fprintf (f, " %-11s ", name);
if (! stringp)
fprintf (f, "0x%lx", (unsigned long) dyn.d_un.d_val);
else
{
const char *string;
string = bfd_elf_string_from_elf_section (abfd, link,
dyn.d_un.d_val);
if (string == NULL)
goto error_return;
fprintf (f, "%s", string);
}
fprintf (f, "\n");
}
free (dynbuf);
dynbuf = NULL;
}
if ((elf_dynverdef (abfd) != 0 && elf_tdata (abfd)->verdef == NULL)
|| (elf_dynverref (abfd) != 0 && elf_tdata (abfd)->verref == NULL))
{
if (! _bfd_elf_slurp_version_tables (abfd))
return false;
}
if (elf_dynverdef (abfd) != 0)
{
Elf_Internal_Verdef *t;
fprintf (f, _("\nVersion definitions:\n"));
for (t = elf_tdata (abfd)->verdef; t != NULL; t = t->vd_nextdef)
{
fprintf (f, "%d 0x%2.2x 0x%8.8lx %s\n", t->vd_ndx,
t->vd_flags, t->vd_hash, t->vd_nodename);
if (t->vd_auxptr->vda_nextptr != NULL)
{
Elf_Internal_Verdaux *a;
fprintf (f, "\t");
for (a = t->vd_auxptr->vda_nextptr;
a != NULL;
a = a->vda_nextptr)
fprintf (f, "%s ", a->vda_nodename);
fprintf (f, "\n");
}
}
}
if (elf_dynverref (abfd) != 0)
{
Elf_Internal_Verneed *t;
fprintf (f, _("\nVersion References:\n"));
for (t = elf_tdata (abfd)->verref; t != NULL; t = t->vn_nextref)
{
Elf_Internal_Vernaux *a;
fprintf (f, _(" required from %s:\n"), t->vn_filename);
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
fprintf (f, " 0x%8.8lx 0x%2.2x %2.2d %s\n", a->vna_hash,
a->vna_flags, a->vna_other, a->vna_nodename);
}
}
return true;
error_return:
if (dynbuf != NULL)
free (dynbuf);
return false;
}
/* Display ELF-specific fields of a symbol. */
void
bfd_elf_print_symbol (abfd, filep, symbol, how)
bfd *abfd;
PTR filep;
asymbol *symbol;
bfd_print_symbol_type how;
{
FILE *file = (FILE *) filep;
switch (how)
{
case bfd_print_symbol_name:
fprintf (file, "%s", symbol->name);
break;
case bfd_print_symbol_more:
fprintf (file, "elf ");
fprintf_vma (file, symbol->value);
fprintf (file, " %lx", (long) symbol->flags);
break;
case bfd_print_symbol_all:
{
const char *section_name;
const char *name = NULL;
struct elf_backend_data *bed;
unsigned char st_other;
section_name = symbol->section ? symbol->section->name : "(*none*)";
bed = get_elf_backend_data (abfd);
if (bed->elf_backend_print_symbol_all)
name = (*bed->elf_backend_print_symbol_all) (abfd, filep, symbol);
if (name == NULL)
{
name = symbol->name;
bfd_print_symbol_vandf ((PTR) file, symbol);
}
fprintf (file, " %s\t", section_name);
/* Print the "other" value for a symbol. For common symbols,
we've already printed the size; now print the alignment.
For other symbols, we have no specified alignment, and
we've printed the address; now print the size. */
fprintf_vma (file,
(bfd_is_com_section (symbol->section)
? ((elf_symbol_type *) symbol)->internal_elf_sym.st_value
: ((elf_symbol_type *) symbol)->internal_elf_sym.st_size));
/* If we have version information, print it. */
if (elf_tdata (abfd)->dynversym_section != 0
&& (elf_tdata (abfd)->dynverdef_section != 0
|| elf_tdata (abfd)->dynverref_section != 0))
{
unsigned int vernum;
const char *version_string;
vernum = ((elf_symbol_type *) symbol)->version & VERSYM_VERSION;
if (vernum == 0)
version_string = "";
else if (vernum == 1)
version_string = "Base";
else if (vernum <= elf_tdata (abfd)->cverdefs)
version_string =
elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
else
{
Elf_Internal_Verneed *t;
version_string = "";
for (t = elf_tdata (abfd)->verref;
t != NULL;
t = t->vn_nextref)
{
Elf_Internal_Vernaux *a;
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
{
if (a->vna_other == vernum)
{
version_string = a->vna_nodename;
break;
}
}
}
}
if ((((elf_symbol_type *) symbol)->version & VERSYM_HIDDEN) == 0)
fprintf (file, " %-11s", version_string);
else
{
int i;
fprintf (file, " (%s)", version_string);
for (i = 10 - strlen (version_string); i > 0; --i)
putc (' ', file);
}
}
/* If the st_other field is not zero, print it. */
st_other = ((elf_symbol_type *) symbol)->internal_elf_sym.st_other;
switch (st_other)
{
case 0: break;
case STV_INTERNAL: fprintf (file, " .internal"); break;
case STV_HIDDEN: fprintf (file, " .hidden"); break;
case STV_PROTECTED: fprintf (file, " .protected"); break;
default:
/* Some other non-defined flags are also present, so print
everything hex. */
fprintf (file, " 0x%02x", (unsigned int) st_other);
}
fprintf (file, " %s", name);
}
break;
}
}
/* Create an entry in an ELF linker hash table. */
struct bfd_hash_entry *
_bfd_elf_link_hash_newfunc (entry, table, string)
struct bfd_hash_entry *entry;
struct bfd_hash_table *table;
const char *string;
{
struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
/* Allocate the structure if it has not already been allocated by a
subclass. */
if (ret == (struct elf_link_hash_entry *) NULL)
ret = ((struct elf_link_hash_entry *)
bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry)));
if (ret == (struct elf_link_hash_entry *) NULL)
return (struct bfd_hash_entry *) ret;
/* Call the allocation method of the superclass. */
ret = ((struct elf_link_hash_entry *)
_bfd_link_hash_newfunc ((struct bfd_hash_entry *) ret,
table, string));
if (ret != (struct elf_link_hash_entry *) NULL)
{
/* Set local fields. */
ret->indx = -1;
ret->size = 0;
ret->dynindx = -1;
ret->dynstr_index = 0;
ret->weakdef = NULL;
ret->got.offset = (bfd_vma) -1;
ret->plt.offset = (bfd_vma) -1;
ret->linker_section_pointer = (elf_linker_section_pointers_t *)0;
ret->verinfo.verdef = NULL;
ret->vtable_entries_used = NULL;
ret->vtable_entries_size = 0;
ret->vtable_parent = NULL;
ret->type = STT_NOTYPE;
ret->other = 0;
/* Assume that we have been called by a non-ELF symbol reader.
This flag is then reset by the code which reads an ELF input
file. This ensures that a symbol created by a non-ELF symbol
reader will have the flag set correctly. */
ret->elf_link_hash_flags = ELF_LINK_NON_ELF;
}
return (struct bfd_hash_entry *) ret;
}
/* Copy data from an indirect symbol to its direct symbol, hiding the
old indirect symbol. */
void
_bfd_elf_link_hash_copy_indirect (dir, ind)
struct elf_link_hash_entry *dir, *ind;
{
/* Copy down any references that we may have already seen to the
symbol which just became indirect. */
dir->elf_link_hash_flags |=
(ind->elf_link_hash_flags
& (ELF_LINK_HASH_REF_DYNAMIC
| ELF_LINK_HASH_REF_REGULAR
| ELF_LINK_HASH_REF_REGULAR_NONWEAK
| ELF_LINK_NON_GOT_REF));
/* Copy over the global and procedure linkage table offset entries.
These may have been already set up by a check_relocs routine. */
if (dir->got.offset == (bfd_vma) -1)
{
dir->got.offset = ind->got.offset;
ind->got.offset = (bfd_vma) -1;
}
BFD_ASSERT (ind->got.offset == (bfd_vma) -1);
if (dir->plt.offset == (bfd_vma) -1)
{
dir->plt.offset = ind->plt.offset;
ind->plt.offset = (bfd_vma) -1;
}
BFD_ASSERT (ind->plt.offset == (bfd_vma) -1);
if (dir->dynindx == -1)
{
dir->dynindx = ind->dynindx;
dir->dynstr_index = ind->dynstr_index;
ind->dynindx = -1;
ind->dynstr_index = 0;
}
BFD_ASSERT (ind->dynindx == -1);
}
void
_bfd_elf_link_hash_hide_symbol (info, h)
struct bfd_link_info *info ATTRIBUTE_UNUSED;
struct elf_link_hash_entry *h;
{
h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
h->plt.offset = (bfd_vma) -1;
if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
h->dynindx = -1;
}
/* Initialize an ELF linker hash table. */
boolean
_bfd_elf_link_hash_table_init (table, abfd, newfunc)
struct elf_link_hash_table *table;
bfd *abfd;
struct bfd_hash_entry *(*newfunc) PARAMS ((struct bfd_hash_entry *,
struct bfd_hash_table *,
const char *));
{
table->dynamic_sections_created = false;
table->dynobj = NULL;
/* The first dynamic symbol is a dummy. */
table->dynsymcount = 1;
table->dynstr = NULL;
table->bucketcount = 0;
table->needed = NULL;
table->runpath = NULL;
table->hgot = NULL;
table->stab_info = NULL;
table->dynlocal = NULL;
return _bfd_link_hash_table_init (&table->root, abfd, newfunc);
}
/* Create an ELF linker hash table. */
struct bfd_link_hash_table *
_bfd_elf_link_hash_table_create (abfd)
bfd *abfd;
{
struct elf_link_hash_table *ret;
ret = ((struct elf_link_hash_table *)
bfd_alloc (abfd, sizeof (struct elf_link_hash_table)));
if (ret == (struct elf_link_hash_table *) NULL)
return NULL;
if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc))
{
bfd_release (abfd, ret);
return NULL;
}
return &ret->root;
}
/* This is a hook for the ELF emulation code in the generic linker to
tell the backend linker what file name to use for the DT_NEEDED
entry for a dynamic object. The generic linker passes name as an
empty string to indicate that no DT_NEEDED entry should be made. */
void
bfd_elf_set_dt_needed_name (abfd, name)
bfd *abfd;
const char *name;
{
if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
&& bfd_get_format (abfd) == bfd_object)
elf_dt_name (abfd) = name;
}
void
bfd_elf_set_dt_needed_soname (abfd, name)
bfd *abfd;
const char *name;
{
if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
&& bfd_get_format (abfd) == bfd_object)
elf_dt_soname (abfd) = name;
}
/* Get the list of DT_NEEDED entries for a link. This is a hook for
the linker ELF emulation code. */
struct bfd_link_needed_list *
bfd_elf_get_needed_list (abfd, info)
bfd *abfd ATTRIBUTE_UNUSED;
struct bfd_link_info *info;
{
if (info->hash->creator->flavour != bfd_target_elf_flavour)
return NULL;
return elf_hash_table (info)->needed;
}
/* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
hook for the linker ELF emulation code. */
struct bfd_link_needed_list *
bfd_elf_get_runpath_list (abfd, info)
bfd *abfd ATTRIBUTE_UNUSED;
struct bfd_link_info *info;
{
if (info->hash->creator->flavour != bfd_target_elf_flavour)
return NULL;
return elf_hash_table (info)->runpath;
}
/* Get the name actually used for a dynamic object for a link. This
is the SONAME entry if there is one. Otherwise, it is the string
passed to bfd_elf_set_dt_needed_name, or it is the filename. */
const char *
bfd_elf_get_dt_soname (abfd)
bfd *abfd;
{
if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
&& bfd_get_format (abfd) == bfd_object)
return elf_dt_name (abfd);
return NULL;
}
/* Get the list of DT_NEEDED entries from a BFD. This is a hook for
the ELF linker emulation code. */
boolean
bfd_elf_get_bfd_needed_list (abfd, pneeded)
bfd *abfd;
struct bfd_link_needed_list **pneeded;
{
asection *s;
bfd_byte *dynbuf = NULL;
int elfsec;
unsigned long link;
bfd_byte *extdyn, *extdynend;
size_t extdynsize;
void (*swap_dyn_in) PARAMS ((bfd *, const PTR, Elf_Internal_Dyn *));
*pneeded = NULL;
if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
|| bfd_get_format (abfd) != bfd_object)
return true;
s = bfd_get_section_by_name (abfd, ".dynamic");
if (s == NULL || s->_raw_size == 0)
return true;
dynbuf = (bfd_byte *) bfd_malloc (s->_raw_size);
if (dynbuf == NULL)
goto error_return;
if (! bfd_get_section_contents (abfd, s, (PTR) dynbuf, (file_ptr) 0,
s->_raw_size))
goto error_return;
elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
if (elfsec == -1)
goto error_return;
link = elf_elfsections (abfd)[elfsec]->sh_link;
extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
extdyn = dynbuf;
extdynend = extdyn + s->_raw_size;
for (; extdyn < extdynend; extdyn += extdynsize)
{
Elf_Internal_Dyn dyn;
(*swap_dyn_in) (abfd, (PTR) extdyn, &dyn);
if (dyn.d_tag == DT_NULL)
break;
if (dyn.d_tag == DT_NEEDED)
{
const char *string;
struct bfd_link_needed_list *l;
string = bfd_elf_string_from_elf_section (abfd, link,
dyn.d_un.d_val);
if (string == NULL)
goto error_return;
l = (struct bfd_link_needed_list *) bfd_alloc (abfd, sizeof *l);
if (l == NULL)
goto error_return;
l->by = abfd;
l->name = string;
l->next = *pneeded;
*pneeded = l;
}
}
free (dynbuf);
return true;
error_return:
if (dynbuf != NULL)
free (dynbuf);
return false;
}
/* Allocate an ELF string table--force the first byte to be zero. */
struct bfd_strtab_hash *
_bfd_elf_stringtab_init ()
{
struct bfd_strtab_hash *ret;
ret = _bfd_stringtab_init ();
if (ret != NULL)
{
bfd_size_type loc;
loc = _bfd_stringtab_add (ret, "", true, false);
BFD_ASSERT (loc == 0 || loc == (bfd_size_type) -1);
if (loc == (bfd_size_type) -1)
{
_bfd_stringtab_free (ret);
ret = NULL;
}
}
return ret;
}
/* ELF .o/exec file reading */
/* Create a new bfd section from an ELF section header. */
boolean
bfd_section_from_shdr (abfd, shindex)
bfd *abfd;
unsigned int shindex;
{
Elf_Internal_Shdr *hdr = elf_elfsections (abfd)[shindex];
Elf_Internal_Ehdr *ehdr = elf_elfheader (abfd);
struct elf_backend_data *bed = get_elf_backend_data (abfd);
char *name;
name = elf_string_from_elf_strtab (abfd, hdr->sh_name);
switch (hdr->sh_type)
{
case SHT_NULL:
/* Inactive section. Throw it away. */
return true;
case SHT_PROGBITS: /* Normal section with contents. */
case SHT_DYNAMIC: /* Dynamic linking information. */
case SHT_NOBITS: /* .bss section. */
case SHT_HASH: /* .hash section. */
case SHT_NOTE: /* .note section. */
return _bfd_elf_make_section_from_shdr (abfd, hdr, name);
case SHT_SYMTAB: /* A symbol table */
if (elf_onesymtab (abfd) == shindex)
return true;
BFD_ASSERT (hdr->sh_entsize == bed->s->sizeof_sym);
BFD_ASSERT (elf_onesymtab (abfd) == 0);
elf_onesymtab (abfd) = shindex;
elf_tdata (abfd)->symtab_hdr = *hdr;
elf_elfsections (abfd)[shindex] = hdr = &elf_tdata (abfd)->symtab_hdr;
abfd->flags |= HAS_SYMS;
/* Sometimes a shared object will map in the symbol table. If
SHF_ALLOC is set, and this is a shared object, then we also
treat this section as a BFD section. We can not base the
decision purely on SHF_ALLOC, because that flag is sometimes
set in a relocateable object file, which would confuse the
linker. */
if ((hdr->sh_flags & SHF_ALLOC) != 0
&& (abfd->flags & DYNAMIC) != 0
&& ! _bfd_elf_make_section_from_shdr (abfd, hdr, name))
return false;
return true;
case SHT_DYNSYM: /* A dynamic symbol table */
if (elf_dynsymtab (abfd) == shindex)
return true;
BFD_ASSERT (hdr->sh_entsize == bed->s->sizeof_sym);
BFD_ASSERT (elf_dynsymtab (abfd) == 0);
elf_dynsymtab (abfd) = shindex;
elf_tdata (abfd)->dynsymtab_hdr = *hdr;
elf_elfsections (abfd)[shindex] = hdr = &elf_tdata (abfd)->dynsymtab_hdr;
abfd->flags |= HAS_SYMS;
/* Besides being a symbol table, we also treat this as a regular
section, so that objcopy can handle it. */
return _bfd_elf_make_section_from_shdr (abfd, hdr, name);
case SHT_STRTAB: /* A string table */
if (hdr->bfd_section != NULL)
return true;
if (ehdr->e_shstrndx == shindex)
{
elf_tdata (abfd)->shstrtab_hdr = *hdr;
elf_elfsections (abfd)[shindex] = &elf_tdata (abfd)->shstrtab_hdr;
return true;
}
{
unsigned int i;
for (i = 1; i < ehdr->e_shnum; i++)
{
Elf_Internal_Shdr *hdr2 = elf_elfsections (abfd)[i];
if (hdr2->sh_link == shindex)
{
if (! bfd_section_from_shdr (abfd, i))
return false;
if (elf_onesymtab (abfd) == i)
{
elf_tdata (abfd)->strtab_hdr = *hdr;
elf_elfsections (abfd)[shindex] =
&elf_tdata (abfd)->strtab_hdr;
return true;
}
if (elf_dynsymtab (abfd) == i)
{
elf_tdata (abfd)->dynstrtab_hdr = *hdr;
elf_elfsections (abfd)[shindex] = hdr =
&elf_tdata (abfd)->dynstrtab_hdr;
/* We also treat this as a regular section, so
that objcopy can handle it. */
break;
}
#if 0 /* Not handling other string tables specially right now. */
hdr2 = elf_elfsections (abfd)[i]; /* in case it moved */
/* We have a strtab for some random other section. */
newsect = (asection *) hdr2->bfd_section;
if (!newsect)
break;
hdr->bfd_section = newsect;
hdr2 = &elf_section_data (newsect)->str_hdr;
*hdr2 = *hdr;
elf_elfsections (abfd)[shindex] = hdr2;
#endif
}
}
}
return _bfd_elf_make_section_from_shdr (abfd, hdr, name);
case SHT_REL:
case SHT_RELA:
/* *These* do a lot of work -- but build no sections! */
{
asection *target_sect;
Elf_Internal_Shdr *hdr2;
/* Check for a bogus link to avoid crashing. */
if (hdr->sh_link >= ehdr->e_shnum)
{
((*_bfd_error_handler)
(_("%s: invalid link %lu for reloc section %s (index %u)"),
bfd_get_filename (abfd), hdr->sh_link, name, shindex));
return _bfd_elf_make_section_from_shdr (abfd, hdr, name);
}
/* For some incomprehensible reason Oracle distributes
libraries for Solaris in which some of the objects have
bogus sh_link fields. It would be nice if we could just
reject them, but, unfortunately, some people need to use
them. We scan through the section headers; if we find only
one suitable symbol table, we clobber the sh_link to point
to it. I hope this doesn't break anything. */
if (elf_elfsections (abfd)[hdr->sh_link]->sh_type != SHT_SYMTAB
&& elf_elfsections (abfd)[hdr->sh_link]->sh_type != SHT_DYNSYM)
{
int scan;
int found;
found = 0;
for (scan = 1; scan < ehdr->e_shnum; scan++)
{
if (elf_elfsections (abfd)[scan]->sh_type == SHT_SYMTAB
|| elf_elfsections (abfd)[scan]->sh_type == SHT_DYNSYM)
{
if (found != 0)
{
found = 0;
break;
}
found = scan;
}
}
if (found != 0)
hdr->sh_link = found;
}
/* Get the symbol table. */
if (elf_elfsections (abfd)[hdr->sh_link]->sh_type == SHT_SYMTAB
&& ! bfd_section_from_shdr (abfd, hdr->sh_link))
return false;
/* If this reloc section does not use the main symbol table we
don't treat it as a reloc section. BFD can't adequately
represent such a section, so at least for now, we don't
try. We just present it as a normal section. We also
can't use it as a reloc section if it points to the null
section. */
if (hdr->sh_link != elf_onesymtab (abfd) || hdr->sh_info == SHN_UNDEF)
return _bfd_elf_make_section_from_shdr (abfd, hdr, name);
if (! bfd_section_from_shdr (abfd, hdr->sh_info))
return false;
target_sect = bfd_section_from_elf_index (abfd, hdr->sh_info);
if (target_sect == NULL)
return false;
if ((target_sect->flags & SEC_RELOC) == 0
|| target_sect->reloc_count == 0)
hdr2 = &elf_section_data (target_sect)->rel_hdr;
else
{
BFD_ASSERT (elf_section_data (target_sect)->rel_hdr2 == NULL);
hdr2 = (Elf_Internal_Shdr *) bfd_alloc (abfd, sizeof (*hdr2));
elf_section_data (target_sect)->rel_hdr2 = hdr2;
}
*hdr2 = *hdr;
elf_elfsections (abfd)[shindex] = hdr2;
target_sect->reloc_count += NUM_SHDR_ENTRIES (hdr);
target_sect->flags |= SEC_RELOC;
target_sect->relocation = NULL;
target_sect->rel_filepos = hdr->sh_offset;
/* In the section to which the relocations apply, mark whether
its relocations are of the REL or RELA variety. */
if (hdr->sh_size != 0)
elf_section_data (target_sect)->use_rela_p
= (hdr->sh_type == SHT_RELA);
abfd->flags |= HAS_RELOC;
return true;
}
break;
case SHT_GNU_verdef:
elf_dynverdef (abfd) = shindex;
elf_tdata (abfd)->dynverdef_hdr = *hdr;
return _bfd_elf_make_section_from_shdr (abfd, hdr, name);
break;
case SHT_GNU_versym:
elf_dynversym (abfd) = shindex;
elf_tdata (abfd)->dynversym_hdr = *hdr;
return _bfd_elf_make_section_from_shdr (abfd, hdr, name);
break;
case SHT_GNU_verneed:
elf_dynverref (abfd) = shindex;
elf_tdata (abfd)->dynverref_hdr = *hdr;
return _bfd_elf_make_section_from_shdr (abfd, hdr, name);
break;
case SHT_SHLIB:
return true;
default:
/* Check for any processor-specific section types. */
{
if (bed->elf_backend_section_from_shdr)
(*bed->elf_backend_section_from_shdr) (abfd, hdr, name);
}
break;
}
return true;
}
/* Given an ELF section number, retrieve the corresponding BFD
section. */
asection *
bfd_section_from_elf_index (abfd, index)
bfd *abfd;
unsigned int index;
{
BFD_ASSERT (index > 0 && index < SHN_LORESERVE);
if (index >= elf_elfheader (abfd)->e_shnum)
return NULL;
return elf_elfsections (abfd)[index]->bfd_section;
}
boolean
_bfd_elf_new_section_hook (abfd, sec)
bfd *abfd;
asection *sec;
{
struct bfd_elf_section_data *sdata;
sdata = (struct bfd_elf_section_data *) bfd_zalloc (abfd, sizeof (*sdata));
if (!sdata)
return false;
sec->used_by_bfd = (PTR) sdata;
/* Indicate whether or not this section should use RELA relocations. */
sdata->use_rela_p
= get_elf_backend_data (abfd)->default_use_rela_p;
return true;
}
/* Create a new bfd section from an ELF program header.
Since program segments have no names, we generate a synthetic name
of the form segment<NUM>, where NUM is generally the index in the
program header table. For segments that are split (see below) we
generate the names segment<NUM>a and segment<NUM>b.
Note that some program segments may have a file size that is different than
(less than) the memory size. All this means is that at execution the
system must allocate the amount of memory specified by the memory size,
but only initialize it with the first "file size" bytes read from the
file. This would occur for example, with program segments consisting
of combined data+bss.
To handle the above situation, this routine generates TWO bfd sections
for the single program segment. The first has the length specified by
the file size of the segment, and the second has the length specified
by the difference between the two sizes. In effect, the segment is split
into it's initialized and uninitialized parts.
*/
boolean
_bfd_elf_make_section_from_phdr (abfd, hdr, index, typename)
bfd *abfd;
Elf_Internal_Phdr *hdr;
int index;
const char *typename;
{
asection *newsect;
char *name;
char namebuf[64];
int split;
split = ((hdr->p_memsz > 0)
&& (hdr->p_filesz > 0)
&& (hdr->p_memsz > hdr->p_filesz));
sprintf (namebuf, "%s%d%s", typename, index, split ? "a" : "");
name = bfd_alloc (abfd, strlen (namebuf) + 1);
if (!name)
return false;
strcpy (name, namebuf);
newsect = bfd_make_section (abfd, name);
if (newsect == NULL)
return false;
newsect->vma = hdr->p_vaddr;
newsect->lma = hdr->p_paddr;
newsect->_raw_size = hdr->p_filesz;
newsect->filepos = hdr->p_offset;
newsect->flags |= SEC_HAS_CONTENTS;
if (hdr->p_type == PT_LOAD)
{
newsect->flags |= SEC_ALLOC;
newsect->flags |= SEC_LOAD;
if (hdr->p_flags & PF_X)
{
/* FIXME: all we known is that it has execute PERMISSION,
may be data. */
newsect->flags |= SEC_CODE;
}
}
if (!(hdr->p_flags & PF_W))
{
newsect->flags |= SEC_READONLY;
}
if (split)
{
sprintf (namebuf, "%s%db", typename, index);
name = bfd_alloc (abfd, strlen (namebuf) + 1);
if (!name)
return false;
strcpy (name, namebuf);
newsect = bfd_make_section (abfd, name);
if (newsect == NULL)
return false;
newsect->vma = hdr->p_vaddr + hdr->p_filesz;
newsect->lma = hdr->p_paddr + hdr->p_filesz;
newsect->_raw_size = hdr->p_memsz - hdr->p_filesz;
if (hdr->p_type == PT_LOAD)
{
newsect->flags |= SEC_ALLOC;
if (hdr->p_flags & PF_X)
newsect->flags |= SEC_CODE;
}
if (!(hdr->p_flags & PF_W))
newsect->flags |= SEC_READONLY;
}
return true;
}
boolean
bfd_section_from_phdr (abfd, hdr, index)
bfd *abfd;
Elf_Internal_Phdr *hdr;
int index;
{
struct elf_backend_data *bed;
switch (hdr->p_type)
{
case PT_NULL:
return _bfd_elf_make_section_from_phdr (abfd, hdr, index, "null");
case PT_LOAD:
return _bfd_elf_make_section_from_phdr (abfd, hdr, index, "load");
case PT_DYNAMIC:
return _bfd_elf_make_section_from_phdr (abfd, hdr, index, "dynamic");
case PT_INTERP:
return _bfd_elf_make_section_from_phdr (abfd, hdr, index, "interp");
case PT_NOTE:
if (! _bfd_elf_make_section_from_phdr (abfd, hdr, index, "note"))
return false;
if (! elfcore_read_notes (abfd, hdr->p_offset, hdr->p_filesz))
return false;
return true;
case PT_SHLIB:
return _bfd_elf_make_section_from_phdr (abfd, hdr, index, "shlib");
case PT_PHDR:
return _bfd_elf_make_section_from_phdr (abfd, hdr, index, "phdr");
default:
/* Check for any processor-specific program segment types.
If no handler for them, default to making "segment" sections. */
bed = get_elf_backend_data (abfd);
if (bed->elf_backend_section_from_phdr)
return (*bed->elf_backend_section_from_phdr) (abfd, hdr, index);
else
return _bfd_elf_make_section_from_phdr (abfd, hdr, index, "segment");
}
}
/* Initialize REL_HDR, the section-header for new section, containing
relocations against ASECT. If USE_RELA_P is true, we use RELA
relocations; otherwise, we use REL relocations. */
boolean
_bfd_elf_init_reloc_shdr (abfd, rel_hdr, asect, use_rela_p)
bfd *abfd;
Elf_Internal_Shdr *rel_hdr;
asection *asect;
boolean use_rela_p;
{
char *name;
struct elf_backend_data *bed;
bed = get_elf_backend_data (abfd);
name = bfd_alloc (abfd, sizeof ".rela" + strlen (asect->name));
if (name == NULL)
return false;
sprintf (name, "%s%s", use_rela_p ? ".rela" : ".rel", asect->name);
rel_hdr->sh_name =
(unsigned int) _bfd_stringtab_add (elf_shstrtab (abfd), name,
true, false);
if (rel_hdr->sh_name == (unsigned int) -1)
return false;
rel_hdr->sh_type = use_rela_p ? SHT_RELA : SHT_REL;
rel_hdr->sh_entsize = (use_rela_p
? bed->s->sizeof_rela
: bed->s->sizeof_rel);
rel_hdr->sh_addralign = bed->s->file_align;
rel_hdr->sh_flags = 0;
rel_hdr->sh_addr = 0;
rel_hdr->sh_size = 0;
rel_hdr->sh_offset = 0;
return true;
}
/* Set up an ELF internal section header for a section. */
static void
elf_fake_sections (abfd, asect, failedptrarg)
bfd *abfd;
asection *asect;
PTR failedptrarg;
{
struct elf_backend_data *bed = get_elf_backend_data (abfd);
boolean *failedptr = (boolean *) failedptrarg;
Elf_Internal_Shdr *this_hdr;
if (*failedptr)
{
/* We already failed; just get out of the bfd_map_over_sections
loop. */
return;
}
this_hdr = &elf_section_data (asect)->this_hdr;
this_hdr->sh_name = (unsigned long) _bfd_stringtab_add (elf_shstrtab (abfd),
asect->name,
true, false);
if (this_hdr->sh_name == (unsigned long) -1)
{
*failedptr = true;
return;
}
this_hdr->sh_flags = 0;
if ((asect->flags & SEC_ALLOC) != 0
|| asect->user_set_vma)
this_hdr->sh_addr = asect->vma;
else
this_hdr->sh_addr = 0;
this_hdr->sh_offset = 0;
this_hdr->sh_size = asect->_raw_size;
this_hdr->sh_link = 0;
this_hdr->sh_addralign = 1 << asect->alignment_power;
/* The sh_entsize and sh_info fields may have been set already by
copy_private_section_data. */
this_hdr->bfd_section = asect;
this_hdr->contents = NULL;
/* FIXME: This should not be based on section names. */
if (strcmp (asect->name, ".dynstr") == 0)
this_hdr->sh_type = SHT_STRTAB;
else if (strcmp (asect->name, ".hash") == 0)
{
this_hdr->sh_type = SHT_HASH;
this_hdr->sh_entsize = bed->s->sizeof_hash_entry;
}
else if (strcmp (asect->name, ".dynsym") == 0)
{
this_hdr->sh_type = SHT_DYNSYM;
this_hdr->sh_entsize = bed->s->sizeof_sym;
}
else if (strcmp (asect->name, ".dynamic") == 0)
{
this_hdr->sh_type = SHT_DYNAMIC;
this_hdr->sh_entsize = bed->s->sizeof_dyn;
}
else if (strncmp (asect->name, ".rela", 5) == 0
&& get_elf_backend_data (abfd)->may_use_rela_p)
{
this_hdr->sh_type = SHT_RELA;
this_hdr->sh_entsize = bed->s->sizeof_rela;
}
else if (strncmp (asect->name, ".rel", 4) == 0
&& get_elf_backend_data (abfd)->may_use_rel_p)
{
this_hdr->sh_type = SHT_REL;
this_hdr->sh_entsize = bed->s->sizeof_rel;
}
else if (strncmp (asect->name, ".note", 5) == 0)
this_hdr->sh_type = SHT_NOTE;
else if (strncmp (asect->name, ".stab", 5) == 0
&& strcmp (asect->name + strlen (asect->name) - 3, "str") == 0)
this_hdr->sh_type = SHT_STRTAB;
else if (strcmp (asect->name, ".gnu.version") == 0)
{
this_hdr->sh_type = SHT_GNU_versym;
this_hdr->sh_entsize = sizeof (Elf_External_Versym);
}
else if (strcmp (asect->name, ".gnu.version_d") == 0)
{
this_hdr->sh_type = SHT_GNU_verdef;
this_hdr->sh_entsize = 0;
/* objcopy or strip will copy over sh_info, but may not set
cverdefs. The linker will set cverdefs, but sh_info will be
zero. */
if (this_hdr->sh_info == 0)
this_hdr->sh_info = elf_tdata (abfd)->cverdefs;
else
BFD_ASSERT (elf_tdata (abfd)->cverdefs == 0
|| this_hdr->sh_info == elf_tdata (abfd)->cverdefs);
}
else if (strcmp (asect->name, ".gnu.version_r") == 0)
{
this_hdr->sh_type = SHT_GNU_verneed;
this_hdr->sh_entsize = 0;
/* objcopy or strip will copy over sh_info, but may not set
cverrefs. The linker will set cverrefs, but sh_info will be
zero. */
if (this_hdr->sh_info == 0)
this_hdr->sh_info = elf_tdata (abfd)->cverrefs;
else
BFD_ASSERT (elf_tdata (abfd)->cverrefs == 0
|| this_hdr->sh_info == elf_tdata (abfd)->cverrefs);
}
else if ((asect->flags & SEC_ALLOC) != 0
&& ((asect->flags & (SEC_LOAD | SEC_HAS_CONTENTS)) == 0))
this_hdr->sh_type = SHT_NOBITS;
else
this_hdr->sh_type = SHT_PROGBITS;
if ((asect->flags & SEC_ALLOC) != 0)
this_hdr->sh_flags |= SHF_ALLOC;
if ((asect->flags & SEC_READONLY) == 0)
this_hdr->sh_flags |= SHF_WRITE;
if ((asect->flags & SEC_CODE) != 0)
this_hdr->sh_flags |= SHF_EXECINSTR;
/* Check for processor-specific section types. */
if (bed->elf_backend_fake_sections)
(*bed->elf_backend_fake_sections) (abfd, this_hdr, asect);
/* If the section has relocs, set up a section header for the
SHT_REL[A] section. If two relocation sections are required for
this section, it is up to the processor-specific back-end to
create the other. */
if ((asect->flags & SEC_RELOC) != 0
&& !_bfd_elf_init_reloc_shdr (abfd,
&elf_section_data (asect)->rel_hdr,
asect,
elf_section_data (asect)->use_rela_p))
*failedptr = true;
}
/* Assign all ELF section numbers. The dummy first section is handled here
too. The link/info pointers for the standard section types are filled
in here too, while we're at it. */
static boolean
assign_section_numbers (abfd)
bfd *abfd;
{
struct elf_obj_tdata *t = elf_tdata (abfd);
asection *sec;
unsigned int section_number;
Elf_Internal_Shdr **i_shdrp;
section_number = 1;
for (sec = abfd->sections; sec; sec = sec->next)
{
struct bfd_elf_section_data *d = elf_section_data (sec);
d->this_idx = section_number++;
if ((sec->flags & SEC_RELOC) == 0)
d->rel_idx = 0;
else
d->rel_idx = section_number++;
if (d->rel_hdr2)
d->rel_idx2 = section_number++;
else
d->rel_idx2 = 0;
}
t->shstrtab_section = section_number++;
elf_elfheader (abfd)->e_shstrndx = t->shstrtab_section;
t->shstrtab_hdr.sh_size = _bfd_stringtab_size (elf_shstrtab (abfd));
if (bfd_get_symcount (abfd) > 0)
{
t->symtab_section = section_number++;
t->strtab_section = section_number++;
}
elf_elfheader (abfd)->e_shnum = section_number;
/* Set up the list of section header pointers, in agreement with the
indices. */
i_shdrp = ((Elf_Internal_Shdr **)
bfd_alloc (abfd, section_number * sizeof (Elf_Internal_Shdr *)));
if (i_shdrp == NULL)
return false;
i_shdrp[0] = ((Elf_Internal_Shdr *)
bfd_alloc (abfd, sizeof (Elf_Internal_Shdr)));
if (i_shdrp[0] == NULL)
{
bfd_release (abfd, i_shdrp);
return false;
}
memset (i_shdrp[0], 0, sizeof (Elf_Internal_Shdr));
elf_elfsections (abfd) = i_shdrp;
i_shdrp[t->shstrtab_section] = &t->shstrtab_hdr;
if (bfd_get_symcount (abfd) > 0)
{
i_shdrp[t->symtab_section] = &t->symtab_hdr;
i_shdrp[t->strtab_section] = &t->strtab_hdr;
t->symtab_hdr.sh_link = t->strtab_section;
}
for (sec = abfd->sections; sec; sec = sec->next)
{
struct bfd_elf_section_data *d = elf_section_data (sec);
asection *s;
const char *name;
i_shdrp[d->this_idx] = &d->this_hdr;
if (d->rel_idx != 0)
i_shdrp[d->rel_idx] = &d->rel_hdr;
if (d->rel_idx2 != 0)
i_shdrp[d->rel_idx2] = d->rel_hdr2;
/* Fill in the sh_link and sh_info fields while we're at it. */
/* sh_link of a reloc section is the section index of the symbol
table. sh_info is the section index of the section to which
the relocation entries apply. */
if (d->rel_idx != 0)
{
d->rel_hdr.sh_link = t->symtab_section;
d->rel_hdr.sh_info = d->this_idx;
}
if (d->rel_idx2 != 0)
{
d->rel_hdr2->sh_link = t->symtab_section;
d->rel_hdr2->sh_info = d->this_idx;
}
switch (d->this_hdr.sh_type)
{
case SHT_REL:
case SHT_RELA:
/* A reloc section which we are treating as a normal BFD
section. sh_link is the section index of the symbol
table. sh_info is the section index of the section to
which the relocation entries apply. We assume that an
allocated reloc section uses the dynamic symbol table.
FIXME: How can we be sure? */
s = bfd_get_section_by_name (abfd, ".dynsym");
if (s != NULL)
d->this_hdr.sh_link = elf_section_data (s)->this_idx;
/* We look up the section the relocs apply to by name. */
name = sec->name;
if (d->this_hdr.sh_type == SHT_REL)
name += 4;
else
name += 5;
s = bfd_get_section_by_name (abfd, name);
if (s != NULL)
d->this_hdr.sh_info = elf_section_data (s)->this_idx;
break;
case SHT_STRTAB:
/* We assume that a section named .stab*str is a stabs
string section. We look for a section with the same name
but without the trailing ``str'', and set its sh_link
field to point to this section. */
if (strncmp (sec->name, ".stab", sizeof ".stab" - 1) == 0
&& strcmp (sec->name + strlen (sec->name) - 3, "str") == 0)
{
size_t len;
char *alc;
len = strlen (sec->name);
alc = (char *) bfd_malloc (len - 2);
if (alc == NULL)
return false;
strncpy (alc, sec->name, len - 3);
alc[len - 3] = '\0';
s = bfd_get_section_by_name (abfd, alc);
free (alc);
if (s != NULL)
{
elf_section_data (s)->this_hdr.sh_link = d->this_idx;
/* This is a .stab section. */
elf_section_data (s)->this_hdr.sh_entsize =
4 + 2 * bfd_get_arch_size (abfd) / 8;
}
}
break;
case SHT_DYNAMIC:
case SHT_DYNSYM:
case SHT_GNU_verneed:
case SHT_GNU_verdef:
/* sh_link is the section header index of the string table
used for the dynamic entries, or the symbol table, or the
version strings. */
s = bfd_get_section_by_name (abfd, ".dynstr");
if (s != NULL)
d->this_hdr.sh_link = elf_section_data (s)->this_idx;
break;
case SHT_HASH:
case SHT_GNU_versym:
/* sh_link is the section header index of the symbol table
this hash table or version table is for. */
s = bfd_get_section_by_name (abfd, ".dynsym");
if (s != NULL)
d->this_hdr.sh_link = elf_section_data (s)->this_idx;
break;
}
}
return true;
}
/* Map symbol from it's internal number to the external number, moving
all local symbols to be at the head of the list. */
static INLINE int
sym_is_global (abfd, sym)
bfd *abfd;
asymbol *sym;
{
/* If the backend has a special mapping, use it. */
if (get_elf_backend_data (abfd)->elf_backend_sym_is_global)
return ((*get_elf_backend_data (abfd)->elf_backend_sym_is_global)
(abfd, sym));
return ((sym->flags & (BSF_GLOBAL | BSF_WEAK)) != 0
|| bfd_is_und_section (bfd_get_section (sym))
|| bfd_is_com_section (bfd_get_section (sym)));
}
static boolean
elf_map_symbols (abfd)
bfd *abfd;
{
int symcount = bfd_get_symcount (abfd);
asymbol **syms = bfd_get_outsymbols (abfd);
asymbol **sect_syms;
int num_locals = 0;
int num_globals = 0;
int num_locals2 = 0;
int num_globals2 = 0;
int max_index = 0;
int num_sections = 0;
int idx;
asection *asect;
asymbol **new_syms;
asymbol *sym;
#ifdef DEBUG
fprintf (stderr, "elf_map_symbols\n");
fflush (stderr);
#endif
/* Add a section symbol for each BFD section. FIXME: Is this really
necessary? */
for (asect = abfd->sections; asect; asect = asect->next)
{
if (max_index < asect->index)
max_index = asect->index;
}
max_index++;
sect_syms = (asymbol **) bfd_zalloc (abfd, max_index * sizeof (asymbol *));
if (sect_syms == NULL)
return false;
elf_section_syms (abfd) = sect_syms;
for (idx = 0; idx < symcount; idx++)
{
sym = syms[idx];
if ((sym->flags & BSF_SECTION_SYM) != 0
&& sym->value == 0)
{
asection *sec;
sec = sym->section;
if (sec->owner != NULL)
{
if (sec->owner != abfd)
{
if (sec->output_offset != 0)
continue;
sec = sec->output_section;
/* Empty sections in the input files may have had a section
symbol created for them. (See the comment near the end of
_bfd_generic_link_output_symbols in linker.c). If the linker
script discards such sections then we will reach this point.
Since we know that we cannot avoid this case, we detect it
and skip the abort and the assignment to the sect_syms array.
To reproduce this particular case try running the linker
testsuite test ld-scripts/weak.exp for an ELF port that uses
the generic linker. */
if (sec->owner == NULL)
continue;
BFD_ASSERT (sec->owner == abfd);
}
sect_syms[sec->index] = syms[idx];
}
}
}
for (asect = abfd->sections; asect; asect = asect->next)
{
if (sect_syms[asect->index] != NULL)
continue;
sym = bfd_make_empty_symbol (abfd);
if (sym == NULL)
return false;
sym->the_bfd = abfd;
sym->name = asect->name;
sym->value = 0;
/* Set the flags to 0 to indicate that this one was newly added. */
sym->flags = 0;
sym->section = asect;
sect_syms[asect->index] = sym;
num_sections++;
#ifdef DEBUG
fprintf (stderr,
_("creating section symbol, name = %s, value = 0x%.8lx, index = %d, section = 0x%.8lx\n"),
asect->name, (long) asect->vma, asect->index, (long) asect);
#endif
}
/* Classify all of the symbols. */
for (idx = 0; idx < symcount; idx++)
{
if (!sym_is_global (abfd, syms[idx]))
num_locals++;
else
num_globals++;
}
for (asect = abfd->sections; asect; asect = asect->next)
{
if (sect_syms[asect->index] != NULL
&& sect_syms[asect->index]->flags == 0)
{
sect_syms[asect->index]->flags = BSF_SECTION_SYM;
if (!sym_is_global (abfd, sect_syms[asect->index]))
num_locals++;
else
num_globals++;
sect_syms[asect->index]->flags = 0;
}
}
/* Now sort the symbols so the local symbols are first. */
new_syms = ((asymbol **)
bfd_alloc (abfd,
(num_locals + num_globals) * sizeof (asymbol *)));
if (new_syms == NULL)
return false;
for (idx = 0; idx < symcount; idx++)
{
asymbol *sym = syms[idx];
int i;
if (!sym_is_global (abfd, sym))
i = num_locals2++;
else
i = num_locals + num_globals2++;
new_syms[i] = sym;
sym->udata.i = i + 1;
}
for (asect = abfd->sections; asect; asect = asect->next)
{
if (sect_syms[asect->index] != NULL
&& sect_syms[asect->index]->flags == 0)
{
asymbol *sym = sect_syms[asect->index];
int i;
sym->flags = BSF_SECTION_SYM;
if (!sym_is_global (abfd, sym))
i = num_locals2++;
else
i = num_locals + num_globals2++;
new_syms[i] = sym;
sym->udata.i = i + 1;
}
}
bfd_set_symtab (abfd, new_syms, num_locals + num_globals);
elf_num_locals (abfd) = num_locals;
elf_num_globals (abfd) = num_globals;
return true;
}
/* Align to the maximum file alignment that could be required for any
ELF data structure. */
static INLINE file_ptr align_file_position PARAMS ((file_ptr, int));
static INLINE file_ptr
align_file_position (off, align)
file_ptr off;
int align;
{
return (off + align - 1) & ~(align - 1);
}
/* Assign a file position to a section, optionally aligning to the
required section alignment. */
INLINE file_ptr
_bfd_elf_assign_file_position_for_section (i_shdrp, offset, align)
Elf_Internal_Shdr *i_shdrp;
file_ptr offset;
boolean align;
{
if (align)
{
unsigned int al;
al = i_shdrp->sh_addralign;
if (al > 1)
offset = BFD_ALIGN (offset, al);
}
i_shdrp->sh_offset = offset;
if (i_shdrp->bfd_section != NULL)
i_shdrp->bfd_section->filepos = offset;
if (i_shdrp->sh_type != SHT_NOBITS)
offset += i_shdrp->sh_size;
return offset;
}
/* Compute the file positions we are going to put the sections at, and
otherwise prepare to begin writing out the ELF file. If LINK_INFO
is not NULL, this is being called by the ELF backend linker. */
boolean
_bfd_elf_compute_section_file_positions (abfd, link_info)
bfd *abfd;
struct bfd_link_info *link_info;
{
struct elf_backend_data *bed = get_elf_backend_data (abfd);
boolean failed;
struct bfd_strtab_hash *strtab;
Elf_Internal_Shdr *shstrtab_hdr;
if (abfd->output_has_begun)
return true;
/* Do any elf backend specific processing first. */
if (bed->elf_backend_begin_write_processing)
(*bed->elf_backend_begin_write_processing) (abfd, link_info);
if (! prep_headers (abfd))
return false;
/* Post process the headers if necessary. */
if (bed->elf_backend_post_process_headers)
(*bed->elf_backend_post_process_headers) (abfd, link_info);
failed = false;
bfd_map_over_sections (abfd, elf_fake_sections, &failed);
if (failed)
return false;
if (!assign_section_numbers (abfd))
return false;
/* The backend linker builds symbol table information itself. */
if (link_info == NULL && bfd_get_symcount (abfd) > 0)
{
/* Non-zero if doing a relocatable link. */
int relocatable_p = ! (abfd->flags & (EXEC_P | DYNAMIC));
if (! swap_out_syms (abfd, &strtab, relocatable_p))
return false;
}
shstrtab_hdr = &elf_tdata (abfd)->shstrtab_hdr;
/* sh_name was set in prep_headers. */
shstrtab_hdr->sh_type = SHT_STRTAB;
shstrtab_hdr->sh_flags = 0;
shstrtab_hdr->sh_addr = 0;
shstrtab_hdr->sh_size = _bfd_stringtab_size (elf_shstrtab (abfd));
shstrtab_hdr->sh_entsize = 0;
shstrtab_hdr->sh_link = 0;
shstrtab_hdr->sh_info = 0;
/* sh_offset is set in assign_file_positions_except_relocs. */
shstrtab_hdr->sh_addralign = 1;
if (!assign_file_positions_except_relocs (abfd))
return false;
if (link_info == NULL && bfd_get_symcount (abfd) > 0)
{
file_ptr off;
Elf_Internal_Shdr *hdr;
off = elf_tdata (abfd)->next_file_pos;
hdr = &elf_tdata (abfd)->symtab_hdr;
off = _bfd_elf_assign_file_position_for_section (hdr, off, true);
hdr = &elf_tdata (abfd)->strtab_hdr;
off = _bfd_elf_assign_file_position_for_section (hdr, off, true);
elf_tdata (abfd)->next_file_pos = off;
/* Now that we know where the .strtab section goes, write it
out. */
if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) != 0
|| ! _bfd_stringtab_emit (abfd, strtab))
return false;
_bfd_stringtab_free (strtab);
}
abfd->output_has_begun = true;
return true;
}
/* Create a mapping from a set of sections to a program segment. */
static INLINE struct elf_segment_map *
make_mapping (abfd, sections, from, to, phdr)
bfd *abfd;
asection **sections;
unsigned int from;
unsigned int to;
boolean phdr;
{
struct elf_segment_map *m;
unsigned int i;
asection **hdrpp;
m = ((struct elf_segment_map *)
bfd_zalloc (abfd,
(sizeof (struct elf_segment_map)
+ (to - from - 1) * sizeof (asection *))));
if (m == NULL)
return NULL;
m->next = NULL;
m->p_type = PT_LOAD;
for (i = from, hdrpp = sections + from; i < to; i++, hdrpp++)
m->sections[i - from] = *hdrpp;
m->count = to - from;
if (from == 0 && phdr)
{
/* Include the headers in the first PT_LOAD segment. */
m->includes_filehdr = 1;
m->includes_phdrs = 1;
}
return m;
}
/* Set up a mapping from BFD sections to program segments. */
static boolean
map_sections_to_segments (abfd)
bfd *abfd;
{
asection **sections = NULL;
asection *s;
unsigned int i;
unsigned int count;
struct elf_segment_map *mfirst;
struct elf_segment_map **pm;
struct elf_segment_map *m;
asection *last_hdr;
unsigned int phdr_index;
bfd_vma maxpagesize;
asection **hdrpp;
boolean phdr_in_segment = true;
boolean writable;
asection *dynsec;
if (elf_tdata (abfd)->segment_map != NULL)
return true;
if (bfd_count_sections (abfd) == 0)
return true;
/* Select the allocated sections, and sort them. */
sections = (asection **) bfd_malloc (bfd_count_sections (abfd)
* sizeof (asection *));
if (sections == NULL)
goto error_return;
i = 0;
for (s = abfd->sections; s != NULL; s = s->next)
{
if ((s->flags & SEC_ALLOC) != 0)
{
sections[i] = s;
++i;
}
}
BFD_ASSERT (i <= bfd_count_sections (abfd));
count = i;
qsort (sections, (size_t) count, sizeof (asection *), elf_sort_sections);
/* Build the mapping. */
mfirst = NULL;
pm = &mfirst;
/* If we have a .interp section, then create a PT_PHDR segment for
the program headers and a PT_INTERP segment for the .interp
section. */
s = bfd_get_section_by_name (abfd, ".interp");
if (s != NULL && (s->flags & SEC_LOAD) != 0)
{
m = ((struct elf_segment_map *)
bfd_zalloc (abfd, sizeof (struct elf_segment_map)));
if (m == NULL)
goto error_return;
m->next = NULL;
m->p_type = PT_PHDR;
/* FIXME: UnixWare and Solaris set PF_X, Irix 5 does not. */
m->p_flags = PF_R | PF_X;
m->p_flags_valid = 1;
m->includes_phdrs = 1;
*pm = m;
pm = &m->next;
m = ((struct elf_segment_map *)
bfd_zalloc (abfd, sizeof (struct elf_segment_map)));
if (m == NULL)
goto error_return;
m->next = NULL;
m->p_type = PT_INTERP;
m->count = 1;
m->sections[0] = s;
*pm = m;
pm = &m->next;
}
/* Look through the sections. We put sections in the same program
segment when the start of the second section can be placed within
a few bytes of the end of the first section. */
last_hdr = NULL;
phdr_index = 0;
maxpagesize = get_elf_backend_data (abfd)->maxpagesize;
writable = false;
dynsec = bfd_get_section_by_name (abfd, ".dynamic");
if (dynsec != NULL
&& (dynsec->flags & SEC_LOAD) == 0)
dynsec = NULL;
/* Deal with -Ttext or something similar such that the first section
is not adjacent to the program headers. This is an
approximation, since at this point we don't know exactly how many
program headers we will need. */
if (count > 0)
{
bfd_size_type phdr_size;
phdr_size = elf_tdata (abfd)->program_header_size;
if (phdr_size == 0)
phdr_size = get_elf_backend_data (abfd)->s->sizeof_phdr;
if ((abfd->flags & D_PAGED) == 0
|| sections[0]->lma < phdr_size
|| sections[0]->lma % maxpagesize < phdr_size % maxpagesize)
phdr_in_segment = false;
}
for (i = 0, hdrpp = sections; i < count; i++, hdrpp++)
{
asection *hdr;
boolean new_segment;
hdr = *hdrpp;
/* See if this section and the last one will fit in the same
segment. */
if (last_hdr == NULL)
{
/* If we don't have a segment yet, then we don't need a new
one (we build the last one after this loop). */
new_segment = false;
}
else if (last_hdr->lma - last_hdr->vma != hdr->lma - hdr->vma)
{
/* If this section has a different relation between the
virtual address and the load address, then we need a new
segment. */
new_segment = true;
}
else if (BFD_ALIGN (last_hdr->lma + last_hdr->_raw_size, maxpagesize)
< BFD_ALIGN (hdr->lma, maxpagesize))
{
/* If putting this section in this segment would force us to
skip a page in the segment, then we need a new segment. */
new_segment = true;
}
else if ((last_hdr->flags & SEC_LOAD) == 0
&& (hdr->flags & SEC_LOAD) != 0)
{
/* We don't want to put a loadable section after a
nonloadable section in the same segment. */
new_segment = true;
}
else if ((abfd->flags & D_PAGED) == 0)
{
/* If the file is not demand paged, which means that we
don't require the sections to be correctly aligned in the
file, then there is no other reason for a new segment. */
new_segment = false;
}
else if (! writable
&& (hdr->flags & SEC_READONLY) == 0
&& (BFD_ALIGN (last_hdr->lma + last_hdr->_raw_size, maxpagesize)
== hdr->lma))
{
/* We don't want to put a writable section in a read only
segment, unless they are on the same page in memory
anyhow. We already know that the last section does not
bring us past the current section on the page, so the
only case in which the new section is not on the same
page as the previous section is when the previous section
ends precisely on a page boundary. */
new_segment = true;
}
else
{
/* Otherwise, we can use the same segment. */
new_segment = false;
}
if (! new_segment)
{
if ((hdr->flags & SEC_READONLY) == 0)
writable = true;
last_hdr = hdr;
continue;
}
/* We need a new program segment. We must create a new program
header holding all the sections from phdr_index until hdr. */
m = make_mapping (abfd, sections, phdr_index, i, phdr_in_segment);
if (m == NULL)
goto error_return;
*pm = m;
pm = &m->next;
if ((hdr->flags & SEC_READONLY) == 0)
writable = true;
else
writable = false;
last_hdr = hdr;
phdr_index = i;
phdr_in_segment = false;
}
/* Create a final PT_LOAD program segment. */
if (last_hdr != NULL)
{
m = make_mapping (abfd, sections, phdr_index, i, phdr_in_segment);
if (m == NULL)
goto error_return;
*pm = m;
pm = &m->next;
}
/* If there is a .dynamic section, throw in a PT_DYNAMIC segment. */
if (dynsec != NULL)
{
m = ((struct elf_segment_map *)
bfd_zalloc (abfd, sizeof (struct elf_segment_map)));
if (m == NULL)
goto error_return;
m->next = NULL;
m->p_type = PT_DYNAMIC;
m->count = 1;
m->sections[0] = dynsec;
*pm = m;
pm = &m->next;
}
/* For each loadable .note section, add a PT_NOTE segment. We don't
use bfd_get_section_by_name, because if we link together
nonloadable .note sections and loadable .note sections, we will
generate two .note sections in the output file. FIXME: Using
names for section types is bogus anyhow. */
for (s = abfd->sections; s != NULL; s = s->next)
{
if ((s->flags & SEC_LOAD) != 0
&& strncmp (s->name, ".note", 5) == 0)
{
m = ((struct elf_segment_map *)
bfd_zalloc (abfd, sizeof (struct elf_segment_map)));
if (m == NULL)
goto error_return;
m->next = NULL;
m->p_type = PT_NOTE;
m->count = 1;
m->sections[0] = s;
*pm = m;
pm = &m->next;
}
}
free (sections);
sections = NULL;
elf_tdata (abfd)->segment_map = mfirst;
return true;
error_return:
if (sections != NULL)
free (sections);
return false;
}
/* Sort sections by address. */
static int
elf_sort_sections (arg1, arg2)
const PTR arg1;
const PTR arg2;
{
const asection *sec1 = *(const asection **) arg1;
const asection *sec2 = *(const asection **) arg2;
/* Sort by LMA first, since this is the address used to
place the section into a segment. */
if (sec1->lma < sec2->lma)
return -1;
else if (sec1->lma > sec2->lma)
return 1;
/* Then sort by VMA. Normally the LMA and the VMA will be
the same, and this will do nothing. */
if (sec1->vma < sec2->vma)
return -1;
else if (sec1->vma > sec2->vma)
return 1;
/* Put !SEC_LOAD sections after SEC_LOAD ones. */
#define TOEND(x) (((x)->flags & SEC_LOAD) == 0)
if (TOEND (sec1))
{
if (TOEND (sec2))
return sec1->target_index - sec2->target_index;
else
return 1;
}
if (TOEND (sec2))
return -1;
#undef TOEND
/* Sort by size, to put zero sized sections before others at the
same address. */
if (sec1->_raw_size < sec2->_raw_size)
return -1;
if (sec1->_raw_size > sec2->_raw_size)
return 1;
return sec1->target_index - sec2->target_index;