/* ELF executable support for BFD.
Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
- 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ 2001, 2002, 2003, 2004, 2005, 2006, 2007
+ Free Software Foundation, Inc.
Written by Fred Fish @ Cygnus Support, from information published
in "UNIX System V Release 4, Programmers Guide: ANSI C and
Meissner (Open Software Foundation), and Peter Hoogenboom (University
of Utah) to finish and extend this.
-This file is part of BFD, the Binary File Descriptor library.
+ 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 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 3 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.
+ 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., 51 Franklin Street - Fifth Floor, Boston,
+ MA 02110-1301, USA. */
-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. */
/* Problems and other issues to resolve.
(1) BFD expects there to be some fixed number of "sections" in
- the object file. I.E. there is a "section_count" variable in the
+ the object file. I.E. there is a "section_count" variable in the
bfd structure which contains the number of sections. However, ELF
supports multiple "views" of a file. In particular, with current
implementations, executable files typically have two tables, a
it's cast in stone.
*/
-#include "bfd.h"
#include "sysdep.h"
+#include "bfd.h"
#include "libiberty.h"
#include "bfdlink.h"
#include "libbfd.h"
#define elf_find_section NAME(bfd_elf,find_section)
#define elf_write_shdrs_and_ehdr NAME(bfd_elf,write_shdrs_and_ehdr)
#define elf_write_out_phdrs NAME(bfd_elf,write_out_phdrs)
+#define elf_checksum_contents NAME(bfd_elf,checksum_contents)
#define elf_write_relocs NAME(bfd_elf,write_relocs)
#define elf_slurp_reloc_table NAME(bfd_elf,slurp_reloc_table)
#define LOG_FILE_ALIGN 2
#endif
-#ifdef DEBUG
+#if DEBUG & 2
static void elf_debug_section (int, Elf_Internal_Shdr *);
+#endif
+#if DEBUG & 1
static void elf_debug_file (Elf_Internal_Ehdr *);
-static char *elf_symbol_flags (flagword);
#endif
\f
/* Structure swapping routines */
/* Translate an ELF symbol in external format into an ELF symbol in internal
format. */
-void
+bfd_boolean
elf_swap_symbol_in (bfd *abfd,
const void *psrc,
const void *pshn,
if (dst->st_shndx == SHN_XINDEX)
{
if (shndx == NULL)
- abort ();
+ return FALSE;
dst->st_shndx = H_GET_32 (abfd, shndx->est_shndx);
}
+ return TRUE;
}
/* Translate an ELF symbol in internal format into an ELF symbol in external
&& (x_ehdrp->e_ident[EI_MAG3] == ELFMAG3));
}
+/* Determines if a given section index is valid. */
+
+static inline bfd_boolean
+valid_section_index_p (unsigned index, unsigned num_sections)
+{
+ /* Note: We allow SHN_UNDEF as a valid section index. */
+ if (index < SHN_LORESERVE || index > SHN_HIRESERVE)
+ return index < num_sections;
+
+ /* We disallow the use of reserved indcies, except for those
+ with OS or Application specific meaning. The test make use
+ of the knowledge that:
+ SHN_LORESERVE == SHN_LOPROC
+ and
+ SHN_HIPROC == SHN_LOOS - 1 */
+ /* XXX - Should we allow SHN_XINDEX as a valid index here ? */
+ return (index >= SHN_LOPROC && index <= SHN_HIOS);
+}
+
/* Check to see if the file associated with ABFD matches the target vector
that ABFD points to.
Elf_Internal_Shdr i_shdr;
Elf_Internal_Shdr *i_shdrp; /* Section header table, internal form */
unsigned int shindex;
- char *shstrtab; /* Internal copy of section header stringtab */
const struct elf_backend_data *ebd;
struct bfd_preserve preserve;
asection *s;
bfd_size_type amt;
+ const bfd_target *target;
+ const bfd_target * const *target_ptr;
preserve.marker = NULL;
if (!bfd_preserve_save (abfd, &preserve))
goto got_no_match;
+ target = abfd->xvec;
+
/* Allocate an instance of the elf_obj_tdata structure and hook it up to
the tdata pointer in the bfd. */
- if (! (*abfd->xvec->_bfd_set_format[bfd_object]) (abfd))
+ if (! (*target->_bfd_set_format[bfd_object]) (abfd))
goto got_no_match;
preserve.marker = elf_tdata (abfd);
if (i_ehdrp->e_shoff == 0 && i_ehdrp->e_type == ET_REL)
goto got_wrong_format_error;
- /* As a simple sanity check, verify that the what BFD thinks is the
+ /* As a simple sanity check, verify that what BFD thinks is the
size of each section header table entry actually matches the size
recorded in the file, but only if there are any sections. */
if (i_ehdrp->e_shentsize != sizeof (x_shdr) && i_ehdrp->e_shnum != 0)
&& (ebd->elf_machine_alt2 == 0
|| i_ehdrp->e_machine != ebd->elf_machine_alt2))
{
- const bfd_target * const *target_ptr;
-
if (ebd->elf_machine_code != EM_NONE)
goto got_wrong_format_error;
if ((*target_ptr)->flavour != bfd_target_elf_flavour)
continue;
- back = (const struct elf_backend_data *) (*target_ptr)->backend_data;
+ back = xvec_get_elf_backend_data (*target_ptr);
if (back->elf_machine_code == i_ehdrp->e_machine
|| (back->elf_machine_alt1 != 0
&& back->elf_machine_alt1 == i_ehdrp->e_machine)
goto got_no_match;
}
- /* Remember the entry point specified in the ELF file header. */
- bfd_set_start_address (abfd, i_ehdrp->e_entry);
+ if (ebd->elf_machine_code != EM_NONE
+ && i_ehdrp->e_ident[EI_OSABI] != ebd->elf_osabi)
+ {
+ if (ebd->elf_osabi != ELFOSABI_NONE)
+ goto got_wrong_format_error;
+
+ /* This is an ELFOSABI_NONE ELF target. Let it match any ELF
+ target of the compatible machine for which we do not have a
+ backend with matching ELFOSABI. */
+ for (target_ptr = bfd_target_vector;
+ *target_ptr != NULL;
+ target_ptr++)
+ {
+ const struct elf_backend_data *back;
+
+ /* Skip this target and targets with incompatible byte
+ order. */
+ if (*target_ptr == target
+ || (*target_ptr)->flavour != bfd_target_elf_flavour
+ || (*target_ptr)->byteorder != target->byteorder
+ || ((*target_ptr)->header_byteorder
+ != target->header_byteorder))
+ continue;
+
+ back = xvec_get_elf_backend_data (*target_ptr);
+ if (back->elf_osabi == i_ehdrp->e_ident[EI_OSABI]
+ && (back->elf_machine_code == i_ehdrp->e_machine
+ || (back->elf_machine_alt1 != 0
+ && back->elf_machine_alt1 == i_ehdrp->e_machine)
+ || (back->elf_machine_alt2 != 0
+ && back->elf_machine_alt2 == i_ehdrp->e_machine)))
+ {
+ /* target_ptr is an ELF backend which matches this
+ object file, so reject the ELFOSABI_NONE ELF target. */
+ goto got_wrong_format_error;
+ }
+ }
+ }
if (i_ehdrp->e_shoff != 0)
{
+ bfd_signed_vma where = i_ehdrp->e_shoff;
+
+ if (where != (file_ptr) where)
+ goto got_wrong_format_error;
+
/* Seek to the section header table in the file. */
- if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0)
+ if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0)
goto got_no_match;
/* Read the first section header at index 0, and convert to internal
/* If the section count is zero, the actual count is in the first
section header. */
if (i_ehdrp->e_shnum == SHN_UNDEF)
- i_ehdrp->e_shnum = i_shdr.sh_size;
+ {
+ i_ehdrp->e_shnum = i_shdr.sh_size;
+ if (i_ehdrp->e_shnum != i_shdr.sh_size
+ || i_ehdrp->e_shnum == 0)
+ goto got_wrong_format_error;
+ }
/* And similarly for the string table index. */
if (i_ehdrp->e_shstrndx == SHN_XINDEX)
- i_ehdrp->e_shstrndx = i_shdr.sh_link;
+ {
+ i_ehdrp->e_shstrndx = i_shdr.sh_link;
+ if (i_ehdrp->e_shstrndx != i_shdr.sh_link)
+ goto got_wrong_format_error;
+ }
+
+ /* Sanity check that we can read all of the section headers.
+ It ought to be good enough to just read the last one. */
+ if (i_ehdrp->e_shnum != 1)
+ {
+ /* Check that we don't have a totally silly number of sections. */
+ if (i_ehdrp->e_shnum > (unsigned int) -1 / sizeof (x_shdr)
+ || i_ehdrp->e_shnum > (unsigned int) -1 / sizeof (i_shdr))
+ goto got_wrong_format_error;
+
+ where += (i_ehdrp->e_shnum - 1) * sizeof (x_shdr);
+ if (where != (file_ptr) where)
+ goto got_wrong_format_error;
+ if ((bfd_size_type) where <= i_ehdrp->e_shoff)
+ goto got_wrong_format_error;
+
+ if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0)
+ goto got_no_match;
+ if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr))
+ goto got_no_match;
+
+ /* Back to where we were. */
+ where = i_ehdrp->e_shoff + sizeof (x_shdr);
+ if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0)
+ goto got_no_match;
+ }
}
/* Allocate space for a copy of the section header table in
goto got_no_match;
elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex);
+ /* Sanity check sh_link and sh_info. */
+ if (! valid_section_index_p (i_shdrp[shindex].sh_link, num_sec))
+ goto got_wrong_format_error;
+
+ if (((i_shdrp[shindex].sh_flags & SHF_INFO_LINK)
+ || i_shdrp[shindex].sh_type == SHT_RELA
+ || i_shdrp[shindex].sh_type == SHT_REL)
+ && ! valid_section_index_p (i_shdrp[shindex].sh_info, num_sec))
+ goto got_wrong_format_error;
+
/* If the section is loaded, but not page aligned, clear
D_PAGED. */
if (i_shdrp[shindex].sh_size != 0
&& (i_shdrp[shindex].sh_flags & SHF_ALLOC) != 0
&& i_shdrp[shindex].sh_type != SHT_NOBITS
&& (((i_shdrp[shindex].sh_addr - i_shdrp[shindex].sh_offset)
- % ebd->maxpagesize)
+ % ebd->minpagesize)
!= 0))
abfd->flags &= ~D_PAGED;
}
}
- if (i_ehdrp->e_shstrndx && i_ehdrp->e_shoff)
+ /* A further sanity check. */
+ if (i_ehdrp->e_shnum != 0)
{
- if (! bfd_section_from_shdr (abfd, i_ehdrp->e_shstrndx))
- goto got_no_match;
+ if (! valid_section_index_p (i_ehdrp->e_shstrndx, elf_numsections (abfd)))
+ {
+ /* PR 2257:
+ We used to just goto got_wrong_format_error here
+ but there are binaries in existance for which this test
+ will prevent the binutils from working with them at all.
+ So we are kind, and reset the string index value to 0
+ so that at least some processing can be done. */
+ i_ehdrp->e_shstrndx = SHN_UNDEF;
+ _bfd_error_handler (_("warning: %s has a corrupt string table index - ignoring"), abfd->filename);
+ }
}
+ else if (i_ehdrp->e_shstrndx != SHN_UNDEF)
+ goto got_wrong_format_error;
/* Read in the program headers. */
if (i_ehdrp->e_phnum == 0)
}
}
- /* Read in the string table containing the names of the sections. We
- will need the base pointer to this table later. */
- /* We read this inline now, so that we don't have to go through
- bfd_section_from_shdr with it (since this particular strtab is
- used to find all of the ELF section names.) */
-
- if (i_ehdrp->e_shstrndx != 0 && i_ehdrp->e_shoff)
+ if (i_ehdrp->e_shstrndx != 0 && i_ehdrp->e_shoff != 0)
{
unsigned int num_sec;
- shstrtab = bfd_elf_get_str_section (abfd, i_ehdrp->e_shstrndx);
- if (!shstrtab)
- goto got_no_match;
-
/* Once all of the section headers have been read and converted, we
can start processing them. Note that the first section header is
a dummy placeholder entry, so we ignore it. */
shindex += SHN_HIRESERVE + 1 - SHN_LORESERVE;
}
- /* Set up group pointers. */
- if (! _bfd_elf_setup_group_pointers (abfd))
+ /* Set up ELF sections for SHF_GROUP and SHF_LINK_ORDER. */
+ if (! _bfd_elf_setup_sections (abfd))
goto got_wrong_format_error;
}
goto got_wrong_format_error;
}
+ /* Remember the entry point specified in the ELF file header. */
+ bfd_set_start_address (abfd, i_ehdrp->e_entry);
+
/* If we have created any reloc sections that are associated with
debugging sections, mark the reloc sections as debugging as well. */
for (s = abfd->sections; s != NULL; s = s->next)
}
bfd_preserve_finish (abfd, &preserve);
- return abfd->xvec;
+ return target;
got_wrong_format_error:
/* There is way too much undoing of half-known state here. The caller,
if (sec->reloc_count == 0)
return;
+ /* If we have opened an existing file for update, reloc_count may be
+ set even though we are not linking. In that case we have nothing
+ to do. */
+ if (sec->orelocation == NULL)
+ return;
+
rela_hdr = &elf_section_data (sec)->rel_hdr;
rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count;
return TRUE;
}
+bfd_boolean
+elf_checksum_contents (bfd *abfd,
+ void (*process) (const void *, size_t, void *),
+ void *arg)
+{
+ Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
+ Elf_Internal_Shdr **i_shdrp = elf_elfsections (abfd);
+ Elf_Internal_Phdr *i_phdrp = elf_tdata (abfd)->phdr;
+ unsigned int count, num;
+
+ {
+ Elf_External_Ehdr x_ehdr;
+ Elf_Internal_Ehdr i_ehdr;
+
+ i_ehdr = *i_ehdrp;
+ i_ehdr.e_phoff = i_ehdr.e_shoff = 0;
+ elf_swap_ehdr_out (abfd, &i_ehdr, &x_ehdr);
+ (*process) (&x_ehdr, sizeof x_ehdr, arg);
+ }
+
+ num = i_ehdrp->e_phnum;
+ for (count = 0; count < num; count++)
+ {
+ Elf_External_Phdr x_phdr;
+ elf_swap_phdr_out (abfd, &i_phdrp[count], &x_phdr);
+ (*process) (&x_phdr, sizeof x_phdr, arg);
+ }
+
+ num = elf_numsections (abfd);
+ for (count = 0; count < num; count++)
+ {
+ Elf_Internal_Shdr i_shdr;
+ Elf_External_Shdr x_shdr;
+
+ i_shdr = *i_shdrp[count];
+ i_shdr.sh_offset = 0;
+
+ elf_swap_shdr_out (abfd, &i_shdr, &x_shdr);
+ (*process) (&x_shdr, sizeof x_shdr, arg);
+
+ if (i_shdr.contents)
+ (*process) (i_shdr.contents, i_shdr.sh_size, arg);
+ }
+
+ return TRUE;
+}
+
long
elf_slurp_symbol_table (bfd *abfd, asymbol **symptrs, bfd_boolean dynamic)
{
symcount);
/* Slurp in the symbols without the version information,
- since that is more helpful than just quitting. */
+ since that is more helpful than just quitting. */
verhdr = NULL;
}
memcpy (&sym->internal_elf_sym, isym, sizeof (Elf_Internal_Sym));
sym->symbol.the_bfd = abfd;
- sym->symbol.name = bfd_elf_string_from_elf_section (abfd,
- hdr->sh_link,
- isym->st_name);
+ sym->symbol.name = bfd_elf_sym_name (abfd, hdr, isym, NULL);
sym->symbol.value = isym->st_value;
sym->symbol.section = bfd_abs_section_ptr;
/* If this is a relocatable file, then the symbol value is
- already section relative. */
+ already section relative. */
if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
sym->symbol.value -= sym->symbol.section->vma;
case STT_TLS:
sym->symbol.flags |= BSF_THREAD_LOCAL;
break;
+ case STT_RELC:
+ sym->symbol.flags |= BSF_RELC;
+ break;
+ case STT_SRELC:
+ sym->symbol.flags |= BSF_SRELC;
+ break;
}
if (dynamic)
return -1;
}
-/* Read relocations for ASECT from REL_HDR. There are RELOC_COUNT of
+/* Read relocations for ASECT from REL_HDR. There are RELOC_COUNT of
them. */
static bfd_boolean
}
else
{
- asymbol **ps, *s;
+ asymbol **ps;
ps = symbols + ELF_R_SYM (rela.r_info) - 1;
- s = *ps;
- /* Canonicalize ELF section symbols. FIXME: Why? */
- if ((s->flags & BSF_SECTION_SYM) == 0)
- relent->sym_ptr_ptr = ps;
- else
- relent->sym_ptr_ptr = s->section->symbol_ptr_ptr;
+ relent->sym_ptr_ptr = ps;
}
relent->addend = rela.r_addend;
return TRUE;
}
-#ifdef DEBUG
+#if DEBUG & 2
static void
elf_debug_section (int num, Elf_Internal_Shdr *hdr)
{
(long) hdr->sh_entsize);
fflush (stderr);
}
+#endif
+#if DEBUG & 1
static void
elf_debug_file (Elf_Internal_Ehdr *ehdrp)
{
fprintf (stderr, "e_shnum = %ld\n", (long) ehdrp->e_shnum);
fprintf (stderr, "e_shentsize = %ld\n", (long) ehdrp->e_shentsize);
}
-
-static char *
-elf_symbol_flags (flagword flags)
-{
- static char buffer[1024];
-
- buffer[0] = '\0';
- if (flags & BSF_LOCAL)
- strcat (buffer, " local");
-
- if (flags & BSF_GLOBAL)
- strcat (buffer, " global");
-
- if (flags & BSF_DEBUGGING)
- strcat (buffer, " debug");
-
- if (flags & BSF_FUNCTION)
- strcat (buffer, " function");
-
- if (flags & BSF_KEEP)
- strcat (buffer, " keep");
-
- if (flags & BSF_KEEP_G)
- strcat (buffer, " keep_g");
-
- if (flags & BSF_WEAK)
- strcat (buffer, " weak");
-
- if (flags & BSF_SECTION_SYM)
- strcat (buffer, " section-sym");
-
- if (flags & BSF_OLD_COMMON)
- strcat (buffer, " old-common");
-
- if (flags & BSF_NOT_AT_END)
- strcat (buffer, " not-at-end");
-
- if (flags & BSF_CONSTRUCTOR)
- strcat (buffer, " constructor");
-
- if (flags & BSF_WARNING)
- strcat (buffer, " warning");
-
- if (flags & BSF_INDIRECT)
- strcat (buffer, " indirect");
-
- if (flags & BSF_FILE)
- strcat (buffer, " file");
-
- if (flags & DYNAMIC)
- strcat (buffer, " dynamic");
-
- if (flags & ~(BSF_LOCAL
- | BSF_GLOBAL
- | BSF_DEBUGGING
- | BSF_FUNCTION
- | BSF_KEEP
- | BSF_KEEP_G
- | BSF_WEAK
- | BSF_SECTION_SYM
- | BSF_OLD_COMMON
- | BSF_NOT_AT_END
- | BSF_CONSTRUCTOR
- | BSF_WARNING
- | BSF_INDIRECT
- | BSF_FILE
- | BSF_DYNAMIC))
- strcat (buffer, " unknown-bits");
-
- return buffer;
-}
#endif
\f
/* Create a new BFD as if by bfd_openr. Rather than opening a file,
(bfd *templ,
bfd_vma ehdr_vma,
bfd_vma *loadbasep,
- int (*target_read_memory) (bfd_vma, char *, int))
+ int (*target_read_memory) (bfd_vma, bfd_byte *, int))
{
Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
Elf_Internal_Ehdr i_ehdr; /* Elf file header, internal form */
bfd *nbfd;
struct bfd_in_memory *bim;
int contents_size;
- char *contents;
+ bfd_byte *contents;
int err;
unsigned int i;
bfd_vma loadbase;
+ bfd_boolean loadbase_set;
/* Read in the ELF header in external format. */
- err = target_read_memory (ehdr_vma, (char *) &x_ehdr, sizeof x_ehdr);
+ err = target_read_memory (ehdr_vma, (bfd_byte *) &x_ehdr, sizeof x_ehdr);
if (err)
{
bfd_set_error (bfd_error_system_call);
bfd_set_error (bfd_error_no_memory);
return NULL;
}
- err = target_read_memory (ehdr_vma + i_ehdr.e_phoff, (char *) x_phdrs,
+ err = target_read_memory (ehdr_vma + i_ehdr.e_phoff, (bfd_byte *) x_phdrs,
i_ehdr.e_phnum * sizeof x_phdrs[0]);
if (err)
{
contents_size = 0;
last_phdr = NULL;
loadbase = ehdr_vma;
+ loadbase_set = FALSE;
for (i = 0; i < i_ehdr.e_phnum; ++i)
{
elf_swap_phdr_in (templ, &x_phdrs[i], &i_phdrs[i]);
if (segment_end > (bfd_vma) contents_size)
contents_size = segment_end;
- if ((i_phdrs[i].p_offset & -i_phdrs[i].p_align) == 0)
- loadbase = ehdr_vma - (i_phdrs[i].p_vaddr & -i_phdrs[i].p_align);
+ /* LOADADDR is the `Base address' from the gELF specification:
+ `lowest p_vaddr value for a PT_LOAD segment' is P_VADDR from the
+ first PT_LOAD as PT_LOADs are ordered by P_VADDR. */
+ if (!loadbase_set && (i_phdrs[i].p_offset & -i_phdrs[i].p_align) == 0)
+ {
+ loadbase = ehdr_vma - (i_phdrs[i].p_vaddr & -i_phdrs[i].p_align);
+ loadbase_set = TRUE;
+ }
last_phdr = &i_phdrs[i];
}
ELFCLASS, EV_CURRENT,
elf_write_out_phdrs,
elf_write_shdrs_and_ehdr,
+ elf_checksum_contents,
elf_write_relocs,
elf_swap_symbol_in,
elf_swap_symbol_out,
projects / deliverable / binutils-gdb.git / blobdiff