darkkirb/old-cross-binutils
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
old-cross-binutils/bfd/elfcode.h
Ken Raeburn e74034d81a Wed Jun 23 06:05:58 1993 Michael Meissner (meissner@osf.org) 
* elfcode.h (elf_write_object_contents): Don't drop core if
	elf_symbol_from returns a NULL pointer when processing a non-elf
	symbol, use a 0 size instead.

Tue Jun 15 14:38:32 1993  Michael Meissner  (meissner@osf.org)

	* elfcode.h (elf_hash): Delete macro mapping elf_hash to
	bfd_elf32_hash, since the hash table is independent of the 32/64
	bit system.
1993-08-05 18:32:50 +00:00

3690 lines
103 KiB
C
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/* ELF executable support for BFD.
Copyright 1991, 1992, 1993 Free Software Foundation, Inc.
Written by Fred Fish @ Cygnus Support, from information published
in "UNIX System V Release 4, Programmers Guide: ANSI C and
Programming Support Tools". Sufficient support for gdb.
Rewritten by Mark Eichin @ Cygnus Support, from information
published in "System V Application Binary Interface", chapters 4
and 5, as well as the various "Processor Supplement" documents
derived from it. Added support for assembler and other object file
utilities. Further work done by Ken Raeburn (Cygnus Support), Michael
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 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., 675 Mass Ave, Cambridge, MA 02139, 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
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
program header table and a section header table, both of which
partition the executable.
In ELF-speak, the "linking view" of the file uses the section header
table to access "sections" within the file, and the "execution view"
uses the program header table to access "segments" within the file.
"Segments" typically may contain all the data from one or more
"sections".
Note that the section header table is optional in ELF executables,
but it is this information that is most useful to gdb. If the
section header table is missing, then gdb should probably try
to make do with the program header table. (FIXME)
(2) The code in this file is compiled twice, once in 32-bit mode and
once in 64-bit mode. More of it should be made size-independent
and moved into elf.c.
*/
#include <assert.h>
#include <string.h> /* For strrchr and friends */
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "libelf.h"
#ifndef alloca
PTR alloca ();
#endif
/* Renaming structures, typedefs, macros and functions to be size-specific. */
#define Elf_External_Ehdr NAME(Elf,External_Ehdr)
#define Elf_External_Sym NAME(Elf,External_Sym)
#define Elf_External_Shdr NAME(Elf,External_Shdr)
#define Elf_External_Phdr NAME(Elf,External_Phdr)
#define Elf_External_Rel NAME(Elf,External_Rel)
#define Elf_External_Rela NAME(Elf,External_Rela)
#define elf_symbol_type NAME(elf,symbol_type)
#define elf_core_file_failing_command NAME(bfd_elf,core_file_failing_command)
#define elf_core_file_failing_signal NAME(bfd_elf,core_file_failing_signal)
#define elf_core_file_matches_executable_p NAME(bfd_elf,core_file_matches_executable_p)
#define elf_object_p NAME(bfd_elf,object_p)
#define elf_core_file_p NAME(bfd_elf,core_file_p)
#define elf_get_symtab_upper_bound NAME(bfd_elf,get_symtab_upper_bound)
#define elf_get_reloc_upper_bound NAME(bfd_elf,get_reloc_upper_bound)
#define elf_canonicalize_reloc NAME(bfd_elf,canonicalize_reloc)
#define elf_get_symtab NAME(bfd_elf,get_symtab)
#define elf_make_empty_symbol NAME(bfd_elf,make_empty_symbol)
#define elf_get_symbol_info NAME(bfd_elf,get_symbol_info)
#define elf_print_symbol NAME(bfd_elf,print_symbol)
#define elf_get_lineno NAME(bfd_elf,get_lineno)
#define elf_set_arch_mach NAME(bfd_elf,set_arch_mach)
#define elf_find_nearest_line NAME(bfd_elf,find_nearest_line)
#define elf_sizeof_headers NAME(bfd_elf,sizeof_headers)
#define elf_set_section_contents NAME(bfd_elf,set_section_contents)
#define elf_no_info_to_howto NAME(bfd_elf,no_info_to_howto)
#define elf_no_info_to_howto_rel NAME(bfd_elf,no_info_to_howto_rel)
#define elf_new_section_hook NAME(bfd_elf,new_section_hook)
#define write_relocs NAME(bfd_elf,_write_relocs)
#if ARCH_SIZE == 64
#define ELF_R_INFO(X,Y) ELF64_R_INFO(X,Y)
#define ELF_R_SYM(X) ELF64_R_SYM(X)
#define ELFCLASS ELFCLASS64
#endif
#if ARCH_SIZE == 32
#define ELF_R_INFO(X,Y) ELF32_R_INFO(X,Y)
#define ELF_R_SYM(X) ELF32_R_SYM(X)
#define ELFCLASS ELFCLASS32
#endif
static int shstrtab_length_fixed;
struct elf_sect_data {
int reloc_sec;
/* more? */
};
/* Forward declarations of static functions */
static struct sec * section_from_elf_index PARAMS ((bfd *, int));
static int elf_section_from_bfd_section PARAMS ((bfd *, struct sec *));
static boolean elf_slurp_symbol_table PARAMS ((bfd *, asymbol **));
static int elf_symbol_from_bfd_symbol PARAMS ((bfd *,
struct symbol_cache_entry **));
static void elf_map_symbols PARAMS ((bfd *));
static void swap_out_syms PARAMS ((bfd *));
#ifdef DEBUG
static void elf_debug_section PARAMS ((char *, int, Elf_Internal_Shdr *));
static void elf_debug_file PARAMS ((Elf_Internal_Ehdr *));
#endif
#define elf_string_from_elf_strtab(abfd,strindex) \
elf_string_from_elf_section(abfd,elf_elfheader(abfd)->e_shstrndx,strindex)
/* Structure swapping routines */
/* Should perhaps use put_offset, put_word, etc. For now, the two versions
can be handled by explicitly specifying 32 bits or "the long type". */
#if ARCH_SIZE == 64
#define put_word bfd_h_put_64
#define get_word bfd_h_get_64
#endif
#if ARCH_SIZE == 32
#define put_word bfd_h_put_32
#define get_word bfd_h_get_32
#endif
/* Translate an ELF symbol in external format into an ELF symbol in internal
format. */
static void
DEFUN (elf_swap_symbol_in, (abfd, src, dst),
bfd * abfd AND
Elf_External_Sym * src AND
Elf_Internal_Sym * dst)
{
dst->st_name = bfd_h_get_32 (abfd, (bfd_byte *) src->st_name);
dst->st_value = get_word (abfd, (bfd_byte *) src->st_value);
dst->st_size = get_word (abfd, (bfd_byte *) src->st_size);
dst->st_info = bfd_h_get_8 (abfd, (bfd_byte *) src->st_info);
dst->st_other = bfd_h_get_8 (abfd, (bfd_byte *) src->st_other);
dst->st_shndx = bfd_h_get_16 (abfd, (bfd_byte *) src->st_shndx);
}
/* Translate an ELF symbol in internal format into an ELF symbol in external
format. */
static void
DEFUN (elf_swap_symbol_out, (abfd, src, dst),
bfd * abfd AND
Elf_Internal_Sym * src AND
Elf_External_Sym * dst)
{
bfd_h_put_32 (abfd, src->st_name, dst->st_name);
put_word (abfd, src->st_value, dst->st_value);
put_word (abfd, src->st_size, dst->st_size);
bfd_h_put_8 (abfd, src->st_info, dst->st_info);
bfd_h_put_8 (abfd, src->st_other, dst->st_other);
bfd_h_put_16 (abfd, src->st_shndx, dst->st_shndx);
}
/* Translate an ELF file header in external format into an ELF file header in
internal format. */
static void
DEFUN (elf_swap_ehdr_in, (abfd, src, dst),
bfd * abfd AND
Elf_External_Ehdr * src AND
Elf_Internal_Ehdr * dst)
{
memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
dst->e_type = bfd_h_get_16 (abfd, (bfd_byte *) src->e_type);
dst->e_machine = bfd_h_get_16 (abfd, (bfd_byte *) src->e_machine);
dst->e_version = bfd_h_get_32 (abfd, (bfd_byte *) src->e_version);
dst->e_entry = get_word (abfd, (bfd_byte *) src->e_entry);
dst->e_phoff = get_word (abfd, (bfd_byte *) src->e_phoff);
dst->e_shoff = get_word (abfd, (bfd_byte *) src->e_shoff);
dst->e_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->e_flags);
dst->e_ehsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_ehsize);
dst->e_phentsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_phentsize);
dst->e_phnum = bfd_h_get_16 (abfd, (bfd_byte *) src->e_phnum);
dst->e_shentsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shentsize);
dst->e_shnum = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shnum);
dst->e_shstrndx = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shstrndx);
}
/* Translate an ELF file header in internal format into an ELF file header in
external format. */
static void
DEFUN (elf_swap_ehdr_out, (abfd, src, dst),
bfd * abfd AND
Elf_Internal_Ehdr * src AND
Elf_External_Ehdr * dst)
{
memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
/* note that all elements of dst are *arrays of unsigned char* already... */
bfd_h_put_16 (abfd, src->e_type, dst->e_type);
bfd_h_put_16 (abfd, src->e_machine, dst->e_machine);
bfd_h_put_32 (abfd, src->e_version, dst->e_version);
put_word (abfd, src->e_entry, dst->e_entry);
put_word (abfd, src->e_phoff, dst->e_phoff);
put_word (abfd, src->e_shoff, dst->e_shoff);
bfd_h_put_32 (abfd, src->e_flags, dst->e_flags);
bfd_h_put_16 (abfd, src->e_ehsize, dst->e_ehsize);
bfd_h_put_16 (abfd, src->e_phentsize, dst->e_phentsize);
bfd_h_put_16 (abfd, src->e_phnum, dst->e_phnum);
bfd_h_put_16 (abfd, src->e_shentsize, dst->e_shentsize);
bfd_h_put_16 (abfd, src->e_shnum, dst->e_shnum);
bfd_h_put_16 (abfd, src->e_shstrndx, dst->e_shstrndx);
}
/* Translate an ELF section header table entry in external format into an
ELF section header table entry in internal format. */
static void
DEFUN (elf_swap_shdr_in, (abfd, src, dst),
bfd * abfd AND
Elf_External_Shdr * src AND
Elf_Internal_Shdr * dst)
{
dst->sh_name = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_name);
dst->sh_type = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_type);
dst->sh_flags = get_word (abfd, (bfd_byte *) src->sh_flags);
dst->sh_addr = get_word (abfd, (bfd_byte *) src->sh_addr);
dst->sh_offset = get_word (abfd, (bfd_byte *) src->sh_offset);
dst->sh_size = get_word (abfd, (bfd_byte *) src->sh_size);
dst->sh_link = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_link);
dst->sh_info = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_info);
dst->sh_addralign = get_word (abfd, (bfd_byte *) src->sh_addralign);
dst->sh_entsize = get_word (abfd, (bfd_byte *) src->sh_entsize);
/* we haven't done any processing on it yet, so... */
dst->rawdata = (void *) 0;
}
/* Translate an ELF section header table entry in internal format into an
ELF section header table entry in external format. */
static void
DEFUN (elf_swap_shdr_out, (abfd, src, dst),
bfd * abfd AND
Elf_Internal_Shdr * src AND
Elf_External_Shdr * dst)
{
/* note that all elements of dst are *arrays of unsigned char* already... */
bfd_h_put_32 (abfd, src->sh_name, dst->sh_name);
bfd_h_put_32 (abfd, src->sh_type, dst->sh_type);
put_word (abfd, src->sh_flags, dst->sh_flags);
put_word (abfd, src->sh_addr, dst->sh_addr);
put_word (abfd, src->sh_offset, dst->sh_offset);
put_word (abfd, src->sh_size, dst->sh_size);
bfd_h_put_32 (abfd, src->sh_link, dst->sh_link);
bfd_h_put_32 (abfd, src->sh_info, dst->sh_info);
put_word (abfd, src->sh_addralign, dst->sh_addralign);
put_word (abfd, src->sh_entsize, dst->sh_entsize);
}
/* Translate an ELF program header table entry in external format into an
ELF program header table entry in internal format. */
static void
DEFUN (elf_swap_phdr_in, (abfd, src, dst),
bfd * abfd AND
Elf_External_Phdr * src AND
Elf_Internal_Phdr * dst)
{
dst->p_type = bfd_h_get_32 (abfd, (bfd_byte *) src->p_type);
dst->p_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->p_flags);
dst->p_offset = get_word (abfd, (bfd_byte *) src->p_offset);
dst->p_vaddr = get_word (abfd, (bfd_byte *) src->p_vaddr);
dst->p_paddr = get_word (abfd, (bfd_byte *) src->p_paddr);
dst->p_filesz = get_word (abfd, (bfd_byte *) src->p_filesz);
dst->p_memsz = get_word (abfd, (bfd_byte *) src->p_memsz);
dst->p_align = get_word (abfd, (bfd_byte *) src->p_align);
}
static void
DEFUN (elf_swap_phdr_out, (abfd, src, dst),
bfd * abfd AND
Elf_Internal_Phdr * src AND
Elf_External_Phdr * dst)
{
/* note that all elements of dst are *arrays of unsigned char* already... */
bfd_h_put_32 (abfd, src->p_type, dst->p_type);
put_word (abfd, src->p_offset, dst->p_offset);
put_word (abfd, src->p_vaddr, dst->p_vaddr);
put_word (abfd, src->p_paddr, dst->p_paddr);
put_word (abfd, src->p_filesz, dst->p_filesz);
put_word (abfd, src->p_memsz, dst->p_memsz);
bfd_h_put_32 (abfd, src->p_flags, dst->p_flags);
put_word (abfd, src->p_align, dst->p_align);
}
/* Translate an ELF reloc from external format to internal format. */
static INLINE void
DEFUN (elf_swap_reloc_in, (abfd, src, dst),
bfd * abfd AND
Elf_External_Rel * src AND
Elf_Internal_Rel * dst)
{
dst->r_offset = get_word (abfd, (bfd_byte *) src->r_offset);
dst->r_info = get_word (abfd, (bfd_byte *) src->r_info);
}
static INLINE void
DEFUN (elf_swap_reloca_in, (abfd, src, dst),
bfd * abfd AND
Elf_External_Rela * src AND
Elf_Internal_Rela * dst)
{
dst->r_offset = get_word (abfd, (bfd_byte *) src->r_offset);
dst->r_info = get_word (abfd, (bfd_byte *) src->r_info);
dst->r_addend = get_word (abfd, (bfd_byte *) src->r_addend);
}
/* Translate an ELF reloc from internal format to external format. */
static INLINE void
DEFUN (elf_swap_reloc_out, (abfd, src, dst),
bfd * abfd AND
Elf_Internal_Rel * src AND
Elf_External_Rel * dst)
{
put_word (abfd, src->r_offset, dst->r_offset);
put_word (abfd, src->r_info, dst->r_info);
}
static INLINE void
DEFUN (elf_swap_reloca_out, (abfd, src, dst),
bfd * abfd AND
Elf_Internal_Rela * src AND
Elf_External_Rela * dst)
{
put_word (abfd, src->r_offset, dst->r_offset);
put_word (abfd, src->r_info, dst->r_info);
put_word (abfd, src->r_addend, dst->r_addend);
}
/* String table creation/manipulation routines */
static struct strtab *
DEFUN (bfd_new_strtab, (abfd),
bfd * abfd)
{
struct strtab *ss;
ss = (struct strtab *) bfd_xmalloc (sizeof (struct strtab));
ss->tab = bfd_xmalloc (1);
BFD_ASSERT (ss->tab != 0);
*ss->tab = 0;
ss->nentries = 0;
ss->length = 1;
return ss;
}
static int
DEFUN (bfd_add_to_strtab, (abfd, ss, str),
bfd * abfd AND
struct strtab *ss AND
CONST char *str)
{
/* should search first, but for now: */
/* include the trailing NUL */
int ln = strlen (str) + 1;
/* should this be using obstacks? */
ss->tab = realloc (ss->tab, ss->length + ln);
BFD_ASSERT (ss->tab != 0);
strcpy (ss->tab + ss->length, str);
ss->nentries++;
ss->length += ln;
return ss->length - ln;
}
static int
DEFUN (bfd_add_2_to_strtab, (abfd, ss, str, str2),
bfd * abfd AND
struct strtab *ss AND
char *str AND
CONST char *str2)
{
/* should search first, but for now: */
/* include the trailing NUL */
int ln = strlen (str) + strlen (str2) + 1;
/* should this be using obstacks? */
if (ss->length)
ss->tab = realloc (ss->tab, ss->length + ln);
else
ss->tab = bfd_xmalloc (ln);
BFD_ASSERT (ss->tab != 0);
strcpy (ss->tab + ss->length, str);
strcpy (ss->tab + ss->length + strlen (str), str2);
ss->nentries++;
ss->length += ln;
return ss->length - ln;
}
/* ELF .o/exec file reading */
/* Create a new bfd section from an ELF section header. */
static boolean
DEFUN (bfd_section_from_shdr, (abfd, shindex),
bfd * abfd AND
unsigned int shindex)
{
Elf_Internal_Shdr *hdr = elf_elfsections (abfd)[shindex];
Elf_Internal_Ehdr *ehdr = elf_elfheader (abfd);
asection *newsect;
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:
/* Bits that get saved. This one is real. */
if (!hdr->rawdata)
{
newsect = bfd_make_section (abfd, name);
if (newsect != NULL)
{
newsect->filepos = hdr->sh_offset; /* so we can read back the bits */
newsect->flags |= SEC_HAS_CONTENTS;
newsect->vma = hdr->sh_addr;
newsect->_raw_size = hdr->sh_size;
newsect->alignment_power = bfd_log2 (hdr->sh_addralign);
if (hdr->sh_flags & SHF_ALLOC)
{
newsect->flags |= SEC_ALLOC;
newsect->flags |= SEC_LOAD;
}
if (!(hdr->sh_flags & SHF_WRITE))
newsect->flags |= SEC_READONLY;
if (hdr->sh_flags & SHF_EXECINSTR)
newsect->flags |= SEC_CODE; /* FIXME: may only contain SOME code */
else
newsect->flags |= SEC_DATA;
hdr->rawdata = (void *) newsect;
}
else
hdr->rawdata = (void *) bfd_get_section_by_name (abfd, name);
}
return true;
case SHT_NOBITS:
/* Bits that get saved. This one is real. */
if (!hdr->rawdata)
{
newsect = bfd_make_section (abfd, name);
if (newsect != NULL)
{
newsect->vma = hdr->sh_addr;
newsect->_raw_size = hdr->sh_size;
newsect->filepos = hdr->sh_offset; /* fake */
newsect->alignment_power = bfd_log2 (hdr->sh_addralign);
if (hdr->sh_flags & SHF_ALLOC)
newsect->flags |= SEC_ALLOC;
if (!(hdr->sh_flags & SHF_WRITE))
newsect->flags |= SEC_READONLY;
if (hdr->sh_flags & SHF_EXECINSTR)
newsect->flags |= SEC_CODE; /* FIXME: may only contain SOME code */
else
newsect->flags |= SEC_DATA;
hdr->rawdata = (void *) newsect;
}
}
return true;
case SHT_SYMTAB: /* A symbol table */
if (elf_onesymtab (abfd) == shindex)
return true;
BFD_ASSERT (hdr->sh_entsize == sizeof (Elf_External_Sym));
BFD_ASSERT (elf_onesymtab (abfd) == 0);
elf_onesymtab (abfd) = shindex;
elf_tdata(abfd)->symtab_hdr = *hdr;
elf_elfsections(abfd)[shindex] = &elf_tdata(abfd)->symtab_hdr;
abfd->flags |= HAS_SYMS;
return true;
case SHT_STRTAB: /* A string table */
if (hdr->rawdata)
return true;
if (ehdr->e_shstrndx == shindex)
{
elf_tdata(abfd)->shstrtab_hdr = *hdr;
elf_elfsections(abfd)[shindex] = &elf_tdata(abfd)->shstrtab_hdr;
hdr->rawdata = (PTR) &elf_tdata(abfd)->shstrtab_hdr;
return true;
}
{
int i;
for (i = 1; i < ehdr->e_shnum; i++)
{
Elf_Internal_Shdr *hdr2 = elf_elfsections(abfd)[i];
if (hdr2->sh_link == shindex)
{
bfd_section_from_shdr (abfd, i);
if (elf_onesymtab (abfd) == i)
{
elf_tdata(abfd)->strtab_hdr = *hdr;
elf_elfsections(abfd)[shindex] = &elf_tdata(abfd)->strtab_hdr;
return true;
}
#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->rawdata;
if (!newsect)
break;
hdr->rawdata = (PTR) newsect;
hdr2 = &elf_section_data (newsect)->str_hdr;
*hdr2 = *hdr;
elf_elfsections(abfd)[shindex] = hdr2;
#endif
}
}
}
newsect = bfd_make_section (abfd, name);
if (newsect)
{
newsect->flags = SEC_HAS_CONTENTS;
hdr->rawdata = (PTR) newsect;
newsect->_raw_size = hdr->sh_size;
newsect->alignment_power = 0;
newsect->vma = 0;
if (hdr->sh_flags & SHF_ALLOC)
newsect->flags |= SEC_ALLOC|SEC_LOAD;
if (!(hdr->sh_flags & SHF_WRITE))
newsect->flags |= SEC_READONLY;
if (hdr->sh_flags & SHF_EXECINSTR)
newsect->flags |= SEC_CODE;
else
newsect->flags |= SEC_DATA;
}
return true;
case SHT_REL:
case SHT_RELA:
/* *These* do a lot of work -- but build no sections!
The spec says there can be multiple strtabs, but only one symtab,
but there can be lots of REL* sections. */
/* FIXME: The above statement is wrong! There are typically at least
two symbol tables in a dynamically linked executable, ".dynsym"
which is the dynamic linkage symbol table and ".symtab", which is
the "traditional" symbol table. -fnf */
{
asection *target_sect;
Elf_Internal_Shdr *hdr2;
int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
/* Don't allow REL relocations on a machine that uses RELA and
vice versa. */
/* @@ Actually, the generic ABI does suggest that both might be
used in one file. But the four ABI Processor Supplements I
have access to right now all specify that only one is used on
each of those architectures. It's conceivable that, e.g., a
bunch of absolute 32-bit relocs might be more compact in REL
form even on a RELA machine... */
BFD_ASSERT (!(use_rela_p && (hdr->sh_type == SHT_REL)));
BFD_ASSERT (!(!use_rela_p && (hdr->sh_type == SHT_RELA)));
BFD_ASSERT (hdr->sh_entsize ==
(use_rela_p
? sizeof (Elf_External_Rela)
: sizeof (Elf_External_Rel)));
bfd_section_from_shdr (abfd, hdr->sh_info); /* target */
bfd_section_from_shdr (abfd, hdr->sh_link); /* symbol table */
target_sect = section_from_elf_index (abfd, hdr->sh_info);
if (target_sect == NULL)
return false;
hdr2 = &elf_section_data (target_sect)->rel_hdr;
*hdr2 = *hdr;
elf_elfsections(abfd)[shindex] = hdr2;
target_sect->reloc_count = hdr->sh_size / hdr->sh_entsize;
target_sect->flags |= SEC_RELOC;
target_sect->relocation = 0;
target_sect->rel_filepos = hdr->sh_offset;
abfd->flags |= HAS_RELOC;
return true;
}
break;
case SHT_HASH:
case SHT_DYNAMIC:
case SHT_DYNSYM: /* could treat this like symtab... */
#if 0
fprintf (stderr, "Dynamic Linking sections not yet supported.\n");
BFD_FAIL ();
#endif
break;
case SHT_NOTE:
#if 0
fprintf (stderr, "Note Sections not yet supported.\n");
BFD_FAIL ();
#endif
break;
case SHT_SHLIB:
#if 0
fprintf (stderr, "SHLIB Sections not supported (and non conforming.)\n");
#endif
return true;
default:
break;
}
return true;
}
boolean
DEFUN (elf_new_section_hook, (abfd, sec),
bfd *abfd
AND asection *sec)
{
struct bfd_elf_section_data *sdata;
sdata = (struct bfd_elf_section_data *) bfd_alloc (abfd, sizeof (*sdata));
sec->used_by_bfd = (PTR) sdata;
memset (sdata, 0, sizeof (*sdata));
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.
*/
static boolean
DEFUN (bfd_section_from_phdr, (abfd, hdr, index),
bfd * abfd AND
Elf_Internal_Phdr * hdr AND
int index)
{
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, split ? "segment%da" : "segment%d", index);
name = bfd_alloc (abfd, strlen (namebuf) + 1);
strcpy (name, namebuf);
newsect = bfd_make_section (abfd, name);
newsect->vma = hdr->p_vaddr;
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, "segment%db", index);
name = bfd_alloc (abfd, strlen (namebuf) + 1);
strcpy (name, namebuf);
newsect = bfd_make_section (abfd, name);
newsect->vma = hdr->p_vaddr + 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;
}
/* Begin processing a given object.
First we validate the file by reading in the ELF header and checking
the magic number. */
static INLINE boolean
DEFUN (elf_file_p, (x_ehdrp), Elf_External_Ehdr * x_ehdrp)
{
return ((x_ehdrp->e_ident[EI_MAG0] == ELFMAG0)
&& (x_ehdrp->e_ident[EI_MAG1] == ELFMAG1)
&& (x_ehdrp->e_ident[EI_MAG2] == ELFMAG2)
&& (x_ehdrp->e_ident[EI_MAG3] == ELFMAG3));
}
bfd_target *
DEFUN (elf_object_p, (abfd), bfd * abfd)
{
Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
Elf_External_Shdr x_shdr; /* Section header table entry, external form */
Elf_Internal_Shdr *i_shdrp; /* Section header table, internal form */
int shindex;
char *shstrtab; /* Internal copy of section header stringtab */
struct elf_backend_data *ebd; /* Use to get ELF_ARCH stored in xvec */
/* Read in the ELF header in external format. */
if (bfd_read ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr))
{
bfd_error = system_call_error;
return NULL;
}
/* Now check to see if we have a valid ELF file, and one that BFD can
make use of. The magic number must match, the address size ('class')
and byte-swapping must match our XVEC entry, and it must have a
section header table (FIXME: See comments re sections at top of this
file). */
if (elf_file_p (&x_ehdr) == false)
{
wrong:
bfd_error = wrong_format;
return NULL;
}
if (x_ehdr.e_ident[EI_VERSION] != EV_CURRENT)
goto wrong;
if (x_ehdr.e_ident[EI_CLASS] != ELFCLASS)
goto wrong;
/* Switch xvec to match the specified byte order. */
switch (x_ehdr.e_ident[EI_DATA])
{
case ELFDATA2MSB: /* Big-endian */
if (!abfd->xvec->header_byteorder_big_p)
goto wrong;
break;
case ELFDATA2LSB: /* Little-endian */
if (abfd->xvec->header_byteorder_big_p)
goto wrong;
break;
case ELFDATANONE: /* No data encoding specified */
default: /* Unknown data encoding specified */
goto wrong;
}
/* Allocate an instance of the elf_obj_tdata structure and hook it up to
the tdata pointer in the bfd. */
if (NULL == (elf_tdata (abfd) = (struct elf_obj_tdata *)
bfd_zalloc (abfd, sizeof (struct elf_obj_tdata))))
{
bfd_error = no_memory;
return NULL;
}
/* FIXME: Any `wrong' exits below here will leak memory (tdata). */
/* Now that we know the byte order, swap in the rest of the header */
i_ehdrp = elf_elfheader (abfd);
elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp);
#if DEBUG & 1
elf_debug_file (i_ehdrp);
#endif
/* If there is no section header table, we're hosed. */
if (i_ehdrp->e_shoff == 0)
goto wrong;
if (i_ehdrp->e_type == ET_EXEC || i_ehdrp->e_type == ET_DYN)
abfd->flags |= EXEC_P;
/* Retrieve the architecture information from the xvec and verify
that it matches the machine info stored in the ELF header.
This allows us to resolve ambiguous formats that might not
otherwise be distinguishable. */
ebd = get_elf_backend_data (abfd);
/* Perhaps the elf architecture value should be another field in the
elf backend data? If you change this to work that way, make sure
that you still get bfd_arch_unknown for unknown architecture types,
and that it still gets accepted by the `generic' elf target. */
{
int i;
enum bfd_architecture arch = bfd_arch_unknown;
for (i = 0; i < bfd_elf_arch_map_size; i++)
{
if (bfd_elf_arch_map[i].elf_arch == i_ehdrp->e_machine)
{
arch = bfd_elf_arch_map[i].bfd_arch;
break;
}
}
/* start-sanitize-v9 */
if (i_ehdrp->e_machine == EM_SPARC64)
arch = bfd_arch_sparc;
/* end-sanitize-v9 */
if (ebd->arch != arch)
goto wrong;
bfd_default_set_arch_mach (abfd, arch, 0);
}
/* Allocate space for a copy of the section header table in
internal form, seek to the section header table in the file,
read it in, and convert it to internal form. As a simple sanity
check, verify that the what BFD thinks is the size of each section
header table entry actually matches the size recorded in the file. */
if (i_ehdrp->e_shentsize != sizeof (x_shdr))
goto wrong;
i_shdrp = (Elf_Internal_Shdr *)
bfd_alloc (abfd, sizeof (*i_shdrp) * i_ehdrp->e_shnum);
elf_elfsections (abfd) =
(Elf_Internal_Shdr **) bfd_alloc (abfd, sizeof (i_shdrp) * i_ehdrp->e_shnum);
if (!i_shdrp || !elf_elfsections(abfd))
{
bfd_error = no_memory;
return NULL;
}
if (bfd_seek (abfd, i_ehdrp->e_shoff, SEEK_SET) == -1)
{
bfd_error = system_call_error;
return NULL;
}
for (shindex = 0; shindex < i_ehdrp->e_shnum; shindex++)
{
if (bfd_read ((PTR) & x_shdr, sizeof x_shdr, 1, abfd)
!= sizeof (x_shdr))
{
bfd_error = system_call_error;
return NULL;
}
elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex);
elf_elfsections(abfd)[shindex] = i_shdrp + shindex;
}
if (i_ehdrp->e_shstrndx)
{
bfd_section_from_shdr (abfd, i_ehdrp->e_shstrndx);
}
#if 0
for (shindex = i_ehdrp->e_shnum - 1; shindex >= 0; shindex--)
{
if (!strcmp (elf_string_from_elf_strtab (abfd,
i_shdrp[shindex].sh_name),
".strtab"))
{
elf_tdata(abfd)->strtab_hdr = i_shdrp[shindex];
elf_elfsections(abfd)[shindex] = &elf_tdata(abfd)->strtab_hdr;
}
else if (!strcmp (elf_string_from_elf_strtab (abfd,
i_shdrp[shindex].sh_name),
".symtab"))
{
elf_tdata(abfd)->symtab_hdr = i_shdrp[shindex];
elf_elfsections(abfd)[shindex] = &elf_tdata(abfd)->symtab_hdr;
elf_onesymtab (abfd) = shindex;
}
}
#endif
/* 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.) */
shstrtab = elf_get_str_section (abfd, i_ehdrp->e_shstrndx);
if (!shstrtab)
return NULL;
/* 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.
We also watch for the symbol table section and remember the file
offset and section size for both the symbol table section and the
associated string table section. */
for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++)
{
bfd_section_from_shdr (abfd, shindex);
}
/* Remember the entry point specified in the ELF file header. */
bfd_get_start_address (abfd) = i_ehdrp->e_entry;
return abfd->xvec;
}
/* ELF .o/exec file writing */
/* Create a new ELF section from a bfd section. */
#if 0 /* not used */
static boolean
DEFUN (bfd_shdr_from_section, (abfd, hdr, shstrtab, indx),
bfd * abfd AND
Elf_Internal_Shdr * hdr AND
struct strtab *shstrtab AND
int indx)
{
asection *sect;
int ndx;
sect = abfd->sections;
for (ndx = indx; --ndx;)
{
sect = sect->next;
}
hdr[indx].sh_name = bfd_add_to_strtab (abfd, shstrtab,
bfd_section_name (abfd, sect));
hdr[indx].sh_addr = sect->vma;
hdr[indx].sh_size = sect->_raw_size;
hdr[indx].sh_addralign = 1 << sect->alignment_power;
hdr[indx].sh_flags = 0;
/* these need to be preserved on */
hdr[indx].sh_link = 0;
hdr[indx].sh_info = 0;
hdr[indx].sh_entsize = 0;
hdr[indx].sh_type = 0;
if (sect->flags & SEC_RELOC)
{
int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
hdr[indx].sh_type = use_rela_p ? SHT_RELA : SHT_REL;
}
if (sect->flags & SEC_HAS_CONTENTS)
{
hdr[indx].sh_offset = sect->filepos;
hdr[indx].sh_size = sect->_raw_size;
}
if (sect->flags & SEC_ALLOC)
{
hdr[indx].sh_flags |= SHF_ALLOC;
if (sect->flags & SEC_LOAD)
{
/* do something with sh_type ? */
}
}
if (!(sect->flags & SEC_READONLY))
hdr[indx].sh_flags |= SHF_WRITE;
if (sect->flags & SEC_CODE)
hdr[indx].sh_flags |= SHF_EXECINSTR;
return true;
}
#endif
/*
Takes a bfd and a symbol, returns a pointer to the elf specific area
of the symbol if there is one.
*/
static INLINE elf_symbol_type *
DEFUN (elf_symbol_from, (ignore_abfd, symbol),
bfd * ignore_abfd AND
asymbol * symbol)
{
if (symbol->the_bfd->xvec->flavour != bfd_target_elf_flavour)
return 0;
if (symbol->the_bfd->tdata.elf_obj_data == (struct elf_obj_tdata *) NULL)
return 0;
return (elf_symbol_type *) symbol;
}
/*
Create ELF output from BFD sections.
Essentially, just create the section header and forget about the program
header for now.
*/
static void
DEFUN (elf_make_sections, (abfd, asect, obj),
bfd * abfd AND
asection * asect AND
PTR obj)
{
/* most of what is in bfd_shdr_from_section goes in here... */
/* and all of these sections generate at *least* one ELF section. */
int idx;
Elf_Internal_Shdr *this_hdr;
this_hdr = &elf_section_data (asect)->this_hdr;
this_hdr->sh_addr = asect->vma;
this_hdr->sh_size = asect->_raw_size;
/* contents already set by elf_set_section_contents */
if (asect->flags & SEC_RELOC)
{
/* emit a reloc section, and thus strtab and symtab... */
Elf_Internal_Shdr *rela_hdr;
Elf_External_Rela *outbound_relocas;
Elf_External_Rel *outbound_relocs;
int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
rela_hdr = &elf_section_data (asect)->rel_hdr;
/* orelocation has the data, reloc_count has the count... */
if (use_rela_p)
{
rela_hdr->sh_type = SHT_RELA;
rela_hdr->sh_entsize = sizeof (Elf_External_Rela);
}
else
/* REL relocations */
{
rela_hdr->sh_type = SHT_REL;
rela_hdr->sh_entsize = sizeof (Elf_External_Rel);
}
rela_hdr->sh_flags = 0;
rela_hdr->sh_addr = 0;
rela_hdr->sh_offset = 0;
rela_hdr->sh_addralign = 0;
rela_hdr->size = 0;
}
if (asect->flags & SEC_ALLOC)
{
this_hdr->sh_flags |= SHF_ALLOC;
if (asect->flags & SEC_LOAD)
{
/* @@ Do something with sh_type? */
}
}
if (!(asect->flags & SEC_READONLY))
this_hdr->sh_flags |= SHF_WRITE;
if (asect->flags & SEC_CODE)
this_hdr->sh_flags |= SHF_EXECINSTR;
}
void
write_relocs (abfd, sec, xxx)
bfd *abfd;
asection *sec;
PTR xxx;
{
Elf_Internal_Shdr *rela_hdr;
Elf_External_Rela *outbound_relocas;
Elf_External_Rel *outbound_relocs;
int idx;
int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
asymbol *last_sym = 0;
int last_sym_idx;
if ((sec->flags & SEC_RELOC) == 0)
return;
/* Flags are sometimes inconsistent. */
if (sec->reloc_count == 0)
return;
rela_hdr = &elf_section_data (sec)->rel_hdr;
rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count;
rela_hdr->contents = (void *) bfd_alloc (abfd, rela_hdr->sh_size);
/* orelocation has the data, reloc_count has the count... */
if (use_rela_p)
{
outbound_relocas = (Elf_External_Rela *) rela_hdr->contents;
for (idx = 0; idx < sec->reloc_count; idx++)
{
Elf_Internal_Rela dst_rela;
Elf_External_Rela *src_rela;
arelent *ptr;
asymbol *sym;
int n;
ptr = sec->orelocation[idx];
src_rela = outbound_relocas + idx;
if (!(abfd->flags & EXEC_P))
dst_rela.r_offset = ptr->address - sec->vma;
else
dst_rela.r_offset = ptr->address;
sym = *ptr->sym_ptr_ptr;
if (sym == last_sym)
n = last_sym_idx;
else
{
last_sym = sym;
last_sym_idx = n = elf_symbol_from_bfd_symbol (abfd, &sym);
}
dst_rela.r_info = ELF_R_INFO (n, ptr->howto->type);
dst_rela.r_addend = ptr->addend;
elf_swap_reloca_out (abfd, &dst_rela, src_rela);
}
}
else
/* REL relocations */
{
outbound_relocs = (Elf_External_Rel *) rela_hdr->contents;
for (idx = 0; idx < sec->reloc_count; idx++)
{
Elf_Internal_Rel dst_rel;
Elf_External_Rel *src_rel;
arelent *ptr;
int n;
asymbol *sym;
ptr = sec->orelocation[idx];
sym = *ptr->sym_ptr_ptr;
src_rel = outbound_relocs + idx;
if (!(abfd->flags & EXEC_P))
dst_rel.r_offset = ptr->address - sec->vma;
else
dst_rel.r_offset = ptr->address;
if (sym == last_sym)
n = last_sym_idx;
else
{
last_sym = sym;
last_sym_idx = n = elf_symbol_from_bfd_symbol (abfd, &sym);
}
dst_rel.r_info = ELF_R_INFO (n, ptr->howto->type);
elf_swap_reloc_out (abfd, &dst_rel, src_rel);
/* Update the addend -- FIXME add 64 bit support. */
bfd_put_32 (abfd, ptr->addend,
(unsigned char *) (elf_section_data (sec)->this_hdr.contents)
+ dst_rel.r_offset);
}
}
}
static void
fix_up_strtabs (abfd, asect, obj)
bfd *abfd;
asection *asect;
PTR obj;
{
Elf_Internal_Shdr *this_hdr = &elf_section_data (asect)->this_hdr;
int this_idx = elf_section_data(asect)->this_idx;
/* @@ Check flags! */
if (!strncmp (asect->name, ".stab", 5)
&& !strcmp ("str", asect->name + strlen (asect->name) - 3))
{
size_t len = strlen (asect->name) + 1;
char *s = (char *) alloca (len);
strcpy (s, asect->name);
s[len - 4] = 0;
asect = bfd_get_section_by_name (abfd, s);
if (!asect)
abort ();
elf_section_data(asect)->this_hdr.sh_link = this_idx;
/* @@ Assuming 32 bits! */
this_hdr->sh_entsize = 0xc;
}
}
static void
DEFUN (elf_fake_sections, (abfd, asect, obj),
bfd * abfd AND
asection * asect AND
PTR obj)
{
/* most of what is in bfd_shdr_from_section goes in here... */
/* and all of these sections generate at *least* one ELF section. */
Elf_Internal_Shdr *this_hdr;
this_hdr = &elf_section_data (asect)->this_hdr;
this_hdr->sh_name =
bfd_add_to_strtab (abfd, elf_shstrtab (abfd), asect->name);
/* We need to log the type *now* so that elf_section_from_bfd_section
can find us... have to set rawdata too. */
this_hdr->rawdata = (void *) asect;
this_hdr->sh_addralign = 1 << asect->alignment_power;
if ((asect->flags & SEC_ALLOC) && (asect->flags & SEC_LOAD))
this_hdr->sh_type = SHT_PROGBITS;
/* @@ Select conditions correctly! */
else if (!strcmp (asect->name, ".bss"))
this_hdr->sh_type = SHT_NOBITS;
else
/* what *do* we put here? */
this_hdr->sh_type = SHT_PROGBITS;
this_hdr->sh_flags = 0;
this_hdr->sh_addr = 0;
this_hdr->sh_size = 0;
this_hdr->sh_entsize = 0;
this_hdr->sh_info = 0;
this_hdr->sh_link = 0;
this_hdr->sh_offset = 0;
this_hdr->size = 0;
{
/* Emit a strtab and symtab, and possibly a reloc section. */
Elf_Internal_Shdr *rela_hdr;
Elf_Internal_Shdr *symstrtab_hdr;
/* Note that only one symtab is used, so just remember it
for now. */
if (asect->flags & SEC_RELOC)
{
int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
rela_hdr = &elf_section_data (asect)->rel_hdr;
rela_hdr->sh_name =
bfd_add_2_to_strtab (abfd, elf_shstrtab (abfd),
use_rela_p ? ".rela" : ".rel",
asect->name);
rela_hdr->sh_type = use_rela_p ? SHT_RELA : SHT_REL;
rela_hdr->sh_entsize = (use_rela_p
? sizeof (Elf_External_Rela)
: sizeof (Elf_External_Rel));
rela_hdr->sh_flags = 0;
rela_hdr->sh_addr = 0;
rela_hdr->sh_size = 0;
rela_hdr->sh_offset = 0;
rela_hdr->sh_addralign = 0;
rela_hdr->size = 0;
}
}
if (asect->flags & SEC_ALLOC)
{
this_hdr->sh_flags |= SHF_ALLOC;
if (asect->flags & SEC_LOAD)
{
/* @@ Do something with sh_type? */
}
}
if (!(asect->flags & SEC_READONLY))
this_hdr->sh_flags |= SHF_WRITE;
if (asect->flags & SEC_CODE)
this_hdr->sh_flags |= SHF_EXECINSTR;
}
/*
xxxINTERNAL_FUNCTION
bfd_elf_locate_sh
xxxSYNOPSIS
struct elf_internal_shdr *bfd_elf_locate_sh (bfd *abfd,
struct strtab *strtab,
struct elf_internal_shdr *shdrp,
CONST char *name);
xxxDESCRIPTION
Helper function to locate an ELF section header given the
name of a BFD section.
*/
static struct elfNAME (internal_shdr) *
DEFUN (elf_locate_sh, (abfd, strtab, shdrp, name),
bfd * abfd AND
struct strtab *strtab AND
struct elfNAME (internal_shdr) *shdrp AND
CONST char *name)
{
Elf_Internal_Shdr *gotit = NULL;
int max, i;
if (shdrp != NULL && strtab != NULL)
{
max = elf_elfheader (abfd)->e_shnum;
for (i = 1; i < max; i++)
{
if (!strcmp (strtab->tab + shdrp[i].sh_name, name))
{
gotit = &shdrp[i];
}
}
}
return gotit;
}
/* 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 (sym)
asymbol *sym;
{
if (sym->flags & BSF_GLOBAL)
{
if (sym->flags & BSF_LOCAL)
abort ();
return 1;
}
if (sym->section == &bfd_und_section)
return 1;
if (bfd_is_com_section (sym->section))
return 1;
if (sym->flags & (BSF_LOCAL | BSF_SECTION_SYM | BSF_FILE))
return 0;
return 0;
}
static void
DEFUN (elf_map_symbols, (abfd), bfd * abfd)
{
int symcount = bfd_get_symcount (abfd);
asymbol **syms = bfd_get_outsymbols (abfd);
int num_locals = 0;
int num_globals = 0;
int num_locals2 = 0;
int num_globals2 = 0;
int num_sections = 0;
int *symtab_map;
int idx;
asection *asect;
#ifdef DEBUG
fprintf (stderr, "elf_map_symbols\n");
fflush (stderr);
#endif
/* Add local symbols for each allocated section
FIXME -- we should only put out symbols for sections that
are actually relocated against. */
for (asect = abfd->sections; asect; asect = asect->next)
{
if (/*asect->flags & (SEC_LOAD | SEC_DATA | SEC_CODE)*/1)
num_sections++;
}
if (num_sections)
{
if (syms)
syms = (asymbol **) bfd_realloc (abfd, syms,
((symcount + num_sections + 1)
* sizeof (asymbol *)));
else
syms = (asymbol **) bfd_alloc (abfd,
(num_sections + 1) * sizeof (asymbol *));
for (asect = abfd->sections; asect; asect = asect->next)
{
if (/* asect->flags & (SEC_LOAD | SEC_DATA | SEC_CODE) */ 1)
{
asymbol *sym = syms[symcount++] = bfd_make_empty_symbol (abfd);
sym->the_bfd = abfd;
sym->name = asect->name;
sym->value = asect->vma;
sym->flags = BSF_SECTION_SYM;
sym->section = asect;
}
}
syms[symcount] = (asymbol *) 0;
bfd_set_symtab (abfd, syms, symcount);
}
elf_symtab_map (abfd) = symtab_map
= (int *) bfd_alloc (abfd, symcount * sizeof (int *));
/* Identify and classify all of the symbols. */
for (idx = 0; idx < symcount; idx++)
{
if (!sym_is_global (syms[idx]))
num_locals++;
else
num_globals++;
}
/* Now provide mapping information. Add +1 for skipping over the
dummy symbol. */
for (idx = 0; idx < symcount; idx++)
{
if (!sym_is_global (syms[idx]))
symtab_map[idx] = 1 + num_locals2++;
else
symtab_map[idx] = 1 + num_locals + num_globals2++;
}
elf_num_locals (abfd) = num_locals;
elf_num_globals (abfd) = num_globals;
}
static void assign_section_numbers ();
static void assign_file_positions_except_relocs ();
static boolean
DEFUN (elf_compute_section_file_positions, (abfd), bfd * abfd)
{
Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
Elf_Internal_Shdr *i_shdrp; /* Section header table, internal form */
struct strtab *shstrtab;
int count, maxsections;
bfd_map_over_sections (abfd, elf_fake_sections, 0);
assign_section_numbers (abfd);
bfd_map_over_sections (abfd, elf_make_sections, 0);
bfd_map_over_sections (abfd, fix_up_strtabs, 0); /* .stab/.stabstr &c */
swap_out_syms (abfd);
assign_file_positions_except_relocs (abfd);
return true;
}
static boolean
DEFUN (elf_write_phdrs, (abfd, i_ehdrp, i_phdrp, phdr_cnt),
bfd * abfd AND
Elf_Internal_Ehdr * i_ehdrp AND
Elf_Internal_Phdr * i_phdrp AND
Elf32_Half phdr_cnt)
{
/* first program header entry goes after the file header */
int outbase = i_ehdrp->e_phoff;
int i;
Elf_External_Phdr x_phdr;
for (i = 0; i < phdr_cnt; i++)
{
elf_swap_phdr_out (abfd, i_phdrp + i, &x_phdr);
bfd_seek (abfd, outbase, SEEK_SET);
bfd_write ((PTR) & x_phdr, sizeof (x_phdr), 1, abfd);
outbase += sizeof (x_phdr);
}
return true;
}
#if 0
static Elf_Internal_Phdr *
DEFUN (elf_build_phdrs, (abfd, i_ehdrp, i_shdrp, phdr_cnt),
bfd * abfd AND
Elf_Internal_Ehdr * i_ehdrp AND
Elf_Internal_Shdr * i_shdrp AND
Elf32_Half * phdr_cnt)
{
Elf_Internal_Phdr *phdr_buf;
int idx;
/* NOTES:
1. The program header table is *not* loaded as part
of the memory image of the program. If this
changes later, the PT_PHDR entry must come first.
2. there is currently no support for program header
entries of type PT_PHDR, PT_DYNAMIC, PT_INTERP,
or PT_SHLIB. */
/* A. Figure out how many program header table entries are needed
1. PT_LOAD for the text segment
2. PT_LOAD for the data segment
Then, reserve space for one more pointer. This will be NULL
to indicate the end of the program header table. */
#ifdef PHDRS_INCLUDED
*phdr_cnt = 4;
#else
/* XXX right now, execve() expects exactly 3 PT entries on HPPA-OSF. */
*phdr_cnt = 3;
#endif
phdr_buf = (Elf_Internal_Phdr *) bfd_xmalloc (((*phdr_cnt) + 1)
*
sizeof (Elf_Internal_Phdr));
idx = 0;
#ifdef PHDRS_INCLUDED
/* B. Fill in the PT_PHDR entry. */
idx++;
#endif
/* C. Fill in the PT_LOAD entry for the text segment. */
phdr_buf[idx].p_type = PT_LOAD;
/* get virtual/physical address from .text section */
phdr_buf[idx].p_vaddr = bfd_get_section_by_name (abfd, ".text")->vma;
phdr_buf[idx].p_paddr = 0; /* XXX */
/* Ultimately, we would like the size of the .text load
segment to be the sum of the following sections:
the program header table itself
.interp
.hash
.dynsym
.dynstr
.rela.bss
.rela.plt
.init
.text
.fini
.rodata
But, right now, it will be the sum of the following sections:
.text
.rodata */
{
static char *CONST ld_sect_names[] =
{".text", ".rodata", NULL};
int i;
int ld_size = 0;
for (i = 0; ld_sect_names[i]; i++)
{
asection *asect = bfd_get_section_by_name (abfd,
ld_sect_names[i]);
if (asect)
ld_size += bfd_section_size (abfd, asect);
}
phdr_buf[idx].p_filesz = ld_size;
/* XXX: need to fix this */
phdr_buf[idx].p_memsz = ld_size;
}
phdr_buf[idx].p_flags = PF_R + PF_X;
phdr_buf[idx].p_align =
bfd_get_section_by_name (abfd, ".text")->alignment_power;
idx++;
/* D. Fill in the PT_LOAD entry for the data segment. */
phdr_buf[idx].p_type = PT_LOAD;
/* get virtual/physical address from .data section */
phdr_buf[idx].p_vaddr = bfd_get_section_by_name (abfd, ".data")->vma;
phdr_buf[idx].p_paddr = 0; /* XXX */
/* Ultimately, we would like the size of the data load segment
to be the sum of the following sections:
the PT_DYNAMIC program header table entry
.plt
.data
.data1
.got
.dynamic
But, right now, it will be the sum of the following sections:
.data */
{
static char *CONST ld_sect_names[] =
{".data", NULL};
int i;
int ld_size = 0;
for (i = 0; ld_sect_names[i]; i++)
{
asection *asect = bfd_get_section_by_name (abfd,
ld_sect_names[i]);
if (asect)
ld_size += bfd_section_size (abfd, asect);
}
phdr_buf[idx].p_filesz = ld_size;
/* XXX: need to fix this */
phdr_buf[idx].p_memsz = ld_size;
}
phdr_buf[idx].p_flags = PF_R + PF_W + PF_X;
phdr_buf[idx].p_align
= bfd_get_section_by_name (abfd, ".data")->alignment_power;
idx++;
/* E. Fill in the PT_LOAD entry for the bss segment. */
phdr_buf[idx].p_type = PT_LOAD;
/* get virtual/physical address from .data section */
phdr_buf[idx].p_vaddr = bfd_get_section_by_name (abfd, ".bss")->vma;
phdr_buf[idx].p_paddr = 0; /* XXX */
{
static char *CONST ld_sect_names[] =
{".bss", NULL};
int i;
int ld_size = 0;
for (i = 0; ld_sect_names[i]; i++)
{
asection *asect = bfd_get_section_by_name (abfd,
ld_sect_names[i]);
if (asect)
ld_size += bfd_section_size (abfd, asect);
}
phdr_buf[idx].p_filesz = 0;
/* XXX: need to fix this */
phdr_buf[idx].p_memsz = ld_size;
}
phdr_buf[idx].p_flags = PF_R + PF_W + PF_X;
phdr_buf[idx].p_align
= bfd_get_section_by_name (abfd, ".bss")->alignment_power;
idx++;
/* F. Set up the "end of program header table" sentinel. */
memset ((char *) (phdr_buf + idx), 0, sizeof (Elf_Internal_Phdr));
idx++;
BFD_ASSERT (idx - 1 == *phdr_cnt);
return phdr_buf;
}
#endif
static const Elf_Internal_Shdr null_shdr;
/* 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. (Link pointers for .stab sections are
not filled in here.) */
static void
assign_section_numbers (abfd)
bfd *abfd;
{
struct elf_obj_tdata *t = elf_tdata (abfd);
asection *sec;
int section_number = 1;
int i;
Elf_Internal_Shdr **i_shdrp;
t->shstrtab_hdr.sh_size = elf_shstrtab(abfd)->length;
t->shstrtab_hdr.contents = (void *) elf_shstrtab(abfd)->tab;
shstrtab_length_fixed = 1;
t->shstrtab_section = section_number++;
elf_elfheader(abfd)->e_shstrndx = t->shstrtab_section;
if (abfd->symcount)
{
t->symtab_section = section_number++;
t->strtab_section = section_number++;
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);
d->this_idx = section_number++;
if (sec->flags & SEC_RELOC)
{
d->rel_idx = section_number++;
d->rel_hdr.sh_link = t->symtab_section;
d->rel_hdr.sh_info = d->this_idx;
}
else
d->rel_idx = 0;
/* No handling for per-section string tables currently. */
}
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 *));
elf_elfsections(abfd) = i_shdrp;
for (i = 0; i < section_number; i++)
i_shdrp[i] = 0;
i_shdrp[0] = (Elf_Internal_Shdr *) &null_shdr;
i_shdrp[t->shstrtab_section] = &t->shstrtab_hdr;
if (abfd->symcount)
{
i_shdrp[t->symtab_section] = &t->symtab_hdr;
i_shdrp[t->strtab_section] = &t->strtab_hdr;
}
for (sec = abfd->sections; sec; sec = sec->next)
{
struct bfd_elf_section_data *d = elf_section_data (sec);
i_shdrp[d->this_idx] = &d->this_hdr;
if (d->rel_idx)
i_shdrp[d->rel_idx] = &d->rel_hdr;
}
/* Make sure we got everything.... */
for (i = 0; i < section_number; i++)
if (i_shdrp[i] == 0)
abort ();
}
static INLINE file_ptr
assign_file_position_for_section (i_shdrp, offset)
Elf_Internal_Shdr *i_shdrp;
file_ptr offset;
{
i_shdrp->sh_offset = offset;
if (i_shdrp->sh_type != SHT_NOBITS)
offset += i_shdrp->sh_size;
return offset;
}
static INLINE file_ptr
assign_file_positions_for_symtab_and_strtabs (abfd, off)
bfd *abfd;
file_ptr off;
{
struct elf_obj_tdata *t = elf_tdata (abfd);
off = assign_file_position_for_section (&t->shstrtab_hdr, off);
off = assign_file_position_for_section (&t->symtab_hdr, off);
off = assign_file_position_for_section (&t->strtab_hdr, off);
return off;
}
struct seg_info {
bfd_vma low, mem_size;
file_ptr file_size;
int start_pos;
int sh_flags;
struct seg_info *next;
};
static void
map_program_segments (abfd)
bfd *abfd;
{
Elf_Internal_Shdr **i_shdrpp = elf_elfsections (abfd);
Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
Elf_Internal_Shdr *i_shdrp;
Elf_Internal_Phdr *phdr;
char *done;
int i, n_left = 0;
file_ptr lowest_offset = 0;
struct seg_info *seg = 0;
done = (char *) alloca (i_ehdrp->e_shnum);
memset (done, 0, i_ehdrp->e_shnum);
for (i = 0; i < i_ehdrp->e_shnum; i++)
{
i_shdrp = i_shdrpp[i];
/* If it's going to be mapped in, it's been assigned a position. */
if (i_shdrp->sh_offset + 1 == 0)
{
/* Well, not really, but we won't process it here. */
done[i] = 1;
continue;
}
if (i_shdrp->sh_offset < lowest_offset
|| lowest_offset == 0)
lowest_offset = i_shdrp->sh_offset;
/* Only interested in PROGBITS or NOBITS for generating segments. */
switch (i_shdrp->sh_type)
{
case SHT_PROGBITS:
case SHT_NOBITS:
break;
default:
done[i] = 1;
}
if (!done[i])
n_left++;
}
while (n_left)
{
bfd_vma lowest_vma = -1, high;
int low_sec = 0;
int mem_size;
int file_size = 0;
for (i = 1; i < i_ehdrp->e_shnum; i++)
{
i_shdrp = i_shdrpp[i];
if (!done[i] && i_shdrp->sh_addr < lowest_vma)
{
lowest_vma = i_shdrp->sh_addr;
low_sec = i;
}
}
if (low_sec == 0)
abort ();
/* So now we know the lowest vma of any unassigned sections; start
a segment there. */
{
struct seg_info *s;
s = (struct seg_info *) bfd_alloc (abfd, sizeof (struct seg_info));
s->next = seg;
seg = s;
}
seg->low = lowest_vma;
i_shdrp = i_shdrpp[low_sec];
seg->start_pos = i_shdrp->sh_offset;
seg->sh_flags = i_shdrp->sh_flags;
done[low_sec] = 1, n_left--;
mem_size = i_shdrp->sh_size;
high = lowest_vma + i_shdrp->sh_size;
if (i_shdrp->sh_type == SHT_PROGBITS)
file_size = i_shdrp->sh_size;
for (i = 0; i < i_ehdrp->e_shnum; i++)
{
file_ptr f1;
if (file_size != mem_size)
break;
if (done[i])
continue;
i_shdrp = i_shdrpp[i];
/* position of next byte on disk */
f1 = seg->start_pos + file_size;
if (i_shdrp->sh_type == SHT_PROGBITS)
{
if (i_shdrp->sh_offset - f1 != i_shdrp->sh_addr - high)
continue;
}
else /* sh_type == NOBITS */
{
/* If the section in question has no contents in the disk
file, we really don't care where it supposedly starts.
But we don't want to bother merging it into this segment
if it doesn't start on this memory page. */
bfd_vma page1, page2;
bfd_vma maxpagesize = get_elf_backend_data (abfd)->maxpagesize;
/* page number in address space of current end of seg */
page1 = (high - 1 + maxpagesize - 1) / maxpagesize;
/* page number in address space of start of this section */
page2 = (i_shdrp->sh_addr + maxpagesize - 1) / maxpagesize;
if (page1 != page2)
continue;
}
done[i] = 1, n_left--;
if (i_shdrp->sh_type == SHT_PROGBITS)
file_size = i_shdrp->sh_offset + i_shdrp->sh_size - seg->start_pos;
mem_size = i_shdrp->sh_addr + i_shdrp->sh_size - seg->low;
high = i_shdrp->sh_addr + i_shdrp->sh_size;
i = 0;
}
seg->file_size = file_size;
seg->mem_size = mem_size;
}
/* Now do something with the list of segments we've built up. */
{
bfd_vma maxpagesize = get_elf_backend_data (abfd)->maxpagesize;
struct seg_info *s;
int n_segs = 0;
int sz;
for (s = seg; s; s = s->next)
{
n_segs++;
}
i_ehdrp->e_phentsize = sizeof (Elf_External_Phdr);
sz = sizeof (Elf_External_Phdr) * n_segs;
if (i_ehdrp->e_ehsize + sz <= lowest_offset)
i_ehdrp->e_phoff = i_ehdrp->e_ehsize;
else
{
i_ehdrp->e_phoff = elf_tdata (abfd)->next_file_pos;
elf_tdata (abfd)->next_file_pos += sz;
}
phdr = (Elf_Internal_Phdr*) bfd_alloc (abfd,
n_segs * sizeof (Elf_Internal_Phdr));
elf_tdata (abfd)->phdr = phdr;
while (seg)
{
phdr->p_type = PT_LOAD; /* only type we really support so far */
phdr->p_offset = seg->start_pos;
phdr->p_vaddr = seg->low;
phdr->p_paddr = 0;
phdr->p_filesz = seg->file_size;
phdr->p_memsz = seg->mem_size;
phdr->p_flags = PF_R;
phdr->p_align = maxpagesize; /* ? */
if (seg->sh_flags & SHF_WRITE)
phdr->p_flags |= PF_W;
if (seg->sh_flags & SHF_EXECINSTR)
phdr->p_flags |= PF_X;
phdr++;
seg = seg->next;
}
i_ehdrp->e_phnum = n_segs;
}
elf_write_phdrs (abfd, i_ehdrp, elf_tdata (abfd)->phdr, i_ehdrp->e_phnum);
}
static void
assign_file_positions_except_relocs (abfd)
bfd *abfd;
{
/* For now, we ignore the possibility of having program segments, which
may require some alignment in the file. That'll require padding, and
some interesting calculations to optimize file space usage.
Also, since the application may change the list of relocations for
a given section, we don't figure them in here. We'll put them at the
end of the file, at positions computed during bfd_close.
The order, for now: <ehdr> <shdr> <sec1> <sec2> <sec3> ... <rel1> ...
or: <ehdr> <phdr> <sec1> <sec2> ... <shdr> <rel1> ... */
file_ptr off;
int i;
Elf_Internal_Shdr **i_shdrpp = elf_elfsections (abfd);
Elf_Internal_Shdr *i_shdrp;
Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
int exec_p = (abfd->flags & EXEC_P) != 0;
/* Everything starts after the ELF file header. */
off = i_ehdrp->e_ehsize;
if (!exec_p)
{
/* Section headers. */
i_ehdrp->e_shoff = off;
off += i_ehdrp->e_shnum * i_ehdrp->e_shentsize;
off = assign_file_positions_for_symtab_and_strtabs (abfd, off);
}
for (i = 0; i < i_ehdrp->e_shnum; i++)
{
i_shdrp = i_shdrpp[i];
if (i_shdrp->sh_type == SHT_REL || i_shdrp->sh_type == SHT_RELA)
{
i_shdrp->sh_offset = -1;
continue;
}
if (exec_p)
{
bfd_vma maxpagesize = get_elf_backend_data (abfd)->maxpagesize;
if (maxpagesize == 0)
maxpagesize = 1; /* make the arithmetic work */
/* This isn't necessarily going to give the best packing, if the
segments require padding between them, but since that isn't
usually the case, this'll do. */
if ((i_shdrp->sh_flags & SHF_ALLOC) == 0)
{
i_shdrp->sh_offset = -1;
continue;
}
/* Blindly assume that the segments are ordered optimally. With
the default LD script, they will be. */
{
/* need big unsigned type */
bfd_vma addtl_off;
addtl_off = i_shdrp->sh_addr - off;
addtl_off = addtl_off % maxpagesize;
if (addtl_off)
{
off += addtl_off;
}
}
if (i_shdrp->sh_type == SHT_NOBITS)
{
file_ptr off2;
i_shdrp->sh_offset = off;
if (off % maxpagesize != 0)
off2 = maxpagesize - (off % maxpagesize);
if (off2 > i_shdrp->sh_size)
off2 = i_shdrp->sh_size;
off += off2;
}
}
off = assign_file_position_for_section (i_shdrp, off);
if (exec_p
&& get_elf_backend_data(abfd)->maxpagesize > 1
&& i_shdrp->sh_type == SHT_PROGBITS
&& (i_shdrp->sh_flags & SHF_ALLOC)
&& (i_shdrp->sh_offset - i_shdrp->sh_addr) % get_elf_backend_data(abfd)->maxpagesize != 0)
abort ();
}
if (exec_p)
{
elf_tdata (abfd)->next_file_pos = off;
map_program_segments (abfd);
off = elf_tdata (abfd)->next_file_pos;
/* Section headers. */
i_ehdrp->e_shoff = off;
off += i_ehdrp->e_shnum * i_ehdrp->e_shentsize;
off = assign_file_positions_for_symtab_and_strtabs (abfd, off);
for (i = 0; i < i_ehdrp->e_shnum; i++)
{
i_shdrp = i_shdrpp[i];
if (i_shdrp->sh_offset + 1 == 0
&& i_shdrp->sh_type != SHT_REL
&& i_shdrp->sh_type != SHT_RELA)
off = assign_file_position_for_section (i_shdrp, off);
}
}
elf_tdata (abfd)->next_file_pos = off;
}
static boolean
prep_headers (abfd)
bfd *abfd;
{
Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
Elf_Internal_Phdr *i_phdrp = 0; /* Program header table, internal form */
Elf_External_Shdr *x_shdrp; /* Section header table, external form */
Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */
int count;
int scnt;
struct strtab *shstrtab;
i_ehdrp = elf_elfheader (abfd);
i_shdrp = elf_elfsections (abfd);
shstrtab = bfd_new_strtab (abfd);
elf_shstrtab (abfd) = shstrtab;
i_ehdrp->e_ident[EI_MAG0] = ELFMAG0;
i_ehdrp->e_ident[EI_MAG1] = ELFMAG1;
i_ehdrp->e_ident[EI_MAG2] = ELFMAG2;
i_ehdrp->e_ident[EI_MAG3] = ELFMAG3;
i_ehdrp->e_ident[EI_CLASS] = ELFCLASS;
i_ehdrp->e_ident[EI_DATA] =
abfd->xvec->byteorder_big_p ? ELFDATA2MSB : ELFDATA2LSB;
i_ehdrp->e_ident[EI_VERSION] = EV_CURRENT;
for (count = EI_PAD; count < EI_NIDENT; count++)
i_ehdrp->e_ident[count] = 0;
i_ehdrp->e_type = (abfd->flags & EXEC_P) ? ET_EXEC : ET_REL;
switch (bfd_get_arch (abfd))
{
case bfd_arch_unknown:
i_ehdrp->e_machine = EM_NONE;
break;
case bfd_arch_sparc:
i_ehdrp->e_machine = EM_SPARC;
/* start-sanitize-v9 */
#if ARCH_SIZE == 64
i_ehdrp->e_machine = EM_SPARC64;
#endif
/* end-sanitize-v9 */
break;
case bfd_arch_i386:
i_ehdrp->e_machine = EM_386;
break;
case bfd_arch_m68k:
i_ehdrp->e_machine = EM_68K;
break;
case bfd_arch_m88k:
i_ehdrp->e_machine = EM_88K;
break;
case bfd_arch_i860:
i_ehdrp->e_machine = EM_860;
break;
case bfd_arch_mips: /* MIPS Rxxxx */
i_ehdrp->e_machine = EM_MIPS; /* only MIPS R3000 */
break;
case bfd_arch_hppa:
i_ehdrp->e_machine = EM_HPPA;
break;
/* also note that EM_M32, AT&T WE32100 is unknown to bfd */
default:
i_ehdrp->e_machine = EM_NONE;
}
i_ehdrp->e_version = EV_CURRENT;
i_ehdrp->e_ehsize = sizeof (Elf_External_Ehdr);
/* no program header, for now. */
i_ehdrp->e_phoff = 0;
i_ehdrp->e_phentsize = 0;
i_ehdrp->e_phnum = 0;
/* each bfd section is section header entry */
i_ehdrp->e_entry = bfd_get_start_address (abfd);
i_ehdrp->e_shentsize = sizeof (Elf_External_Shdr);
/* if we're building an executable, we'll need a program header table */
if (abfd->flags & EXEC_P)
{
/* it all happens later */
#if 0
i_ehdrp->e_phentsize = sizeof (Elf_External_Phdr);
/* elf_build_phdrs() returns a (NULL-terminated) array of
Elf_Internal_Phdrs */
i_phdrp = elf_build_phdrs (abfd, i_ehdrp, i_shdrp, &i_ehdrp->e_phnum);
i_ehdrp->e_phoff = outbase;
outbase += i_ehdrp->e_phentsize * i_ehdrp->e_phnum;
#endif
}
else
{
i_ehdrp->e_phentsize = 0;
i_phdrp = 0;
i_ehdrp->e_phoff = 0;
}
elf_tdata (abfd)->symtab_hdr.sh_name = bfd_add_to_strtab (abfd, shstrtab,
".symtab");
elf_tdata (abfd)->strtab_hdr.sh_name = bfd_add_to_strtab (abfd, shstrtab,
".strtab");
elf_tdata (abfd)->shstrtab_hdr.sh_name = bfd_add_to_strtab (abfd, shstrtab,
".shstrtab");
}
static void
swap_out_syms (abfd)
bfd *abfd;
{
struct strtab *shstrtab = elf_shstrtab (abfd);
elf_map_symbols (abfd);
/* Dump out the symtabs. */
{
int symcount = bfd_get_symcount (abfd);
asymbol **syms = bfd_get_outsymbols (abfd);
struct strtab *stt = bfd_new_strtab (abfd);
Elf_Internal_Shdr *symtab_hdr;
Elf_Internal_Shdr *symstrtab_hdr;
Elf_External_Sym *outbound_syms;
int idx;
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
symtab_hdr->sh_type = SHT_SYMTAB;
symtab_hdr->sh_entsize = sizeof (Elf_External_Sym);
symtab_hdr->sh_size = symtab_hdr->sh_entsize * (symcount + 1);
symtab_hdr->sh_info = elf_num_locals (abfd) + 1;
/* see assert in elf_fake_sections that supports this: */
symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
symstrtab_hdr->sh_type = SHT_STRTAB;
outbound_syms = (Elf_External_Sym *)
bfd_alloc (abfd, (1 + symcount) * sizeof (Elf_External_Sym));
/* now generate the data (for "contents") */
{
/* Fill in zeroth symbol and swap it out. */
Elf_Internal_Sym sym;
sym.st_name = 0;
sym.st_value = 0;
sym.st_size = 0;
sym.st_info = 0;
sym.st_other = 0;
sym.st_shndx = SHN_UNDEF;
elf_swap_symbol_out (abfd, &sym, outbound_syms);
}
for (idx = 0; idx < symcount; idx++)
{
Elf_Internal_Sym sym;
bfd_vma value = syms[idx]->value;
if (syms[idx]->flags & BSF_SECTION_SYM)
/* Section symbols have no names. */
sym.st_name = 0;
else
sym.st_name = bfd_add_to_strtab (abfd, stt, syms[idx]->name);
if (bfd_is_com_section (syms[idx]->section))
{
/* ELF common symbols put the alignment into the `value' field,
and the size into the `size' field. This is backwards from
how BFD handles it, so reverse it here. */
sym.st_size = value;
/* Should retrieve this from somewhere... */
sym.st_value = 16;
sym.st_shndx = SHN_COMMON;
}
else
{
asection *sec = syms[idx]->section;
elf_symbol_type *type_ptr;
int shndx;
if (sec->output_section)
{
value += sec->output_offset;
sec = sec->output_section;
}
value += sec->vma;
sym.st_value = value;
type_ptr = elf_symbol_from (abfd, syms[idx]);
sym.st_size = type_ptr ? type_ptr->internal_elf_sym.st_size : 0;
sym.st_shndx = shndx = elf_section_from_bfd_section (abfd, sec);
if (shndx == -1)
{
asection *sec2;
/* Writing this would be a hell of a lot easier if we had
some decent documentation on bfd, and knew what to expect
of the library, and what to demand of applications. For
example, it appears that `objcopy' might not set the
section of a symbol to be a section that is actually in
the output file. */
sec2 = bfd_get_section_by_name (abfd, sec->name);
assert (sec2 != 0);
sym.st_shndx = shndx = elf_section_from_bfd_section (abfd, sec2);
assert (shndx != -1);
}
}
if (bfd_is_com_section (syms[idx]->section))
sym.st_info = ELF_ST_INFO (STB_GLOBAL, STT_NOTYPE);
else if (syms[idx]->section == &bfd_und_section)
sym.st_info = ELF_ST_INFO (STB_GLOBAL, STT_NOTYPE);
else if (syms[idx]->flags & BSF_WEAK)
sym.st_info = ELF_ST_INFO (STB_WEAK, STT_OBJECT);
else if (syms[idx]->flags & BSF_SECTION_SYM)
sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
else if (syms[idx]->flags & BSF_FILE)
sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
else if (syms[idx]->flags & (BSF_GLOBAL | BSF_EXPORT))
{
if (syms[idx]->flags & BSF_FUNCTION)
sym.st_info = ELF_ST_INFO (STB_GLOBAL, STT_FUNC);
else
sym.st_info = ELF_ST_INFO (STB_GLOBAL, STT_OBJECT);
}
else if (syms[idx]->flags & BSF_LOCAL)
{
if (syms[idx]->flags & BSF_FUNCTION)
sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FUNC);
else
sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_OBJECT);
}
else
/* Default to local if flag isn't set at all. */
sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_OBJECT);
sym.st_other = 0;
elf_swap_symbol_out (abfd, &sym,
outbound_syms + elf_symtab_map (abfd)[idx]);
}
symtab_hdr->contents = (PTR) outbound_syms;
symstrtab_hdr->contents = (PTR) stt->tab;
symstrtab_hdr->sh_size = stt->length;
symstrtab_hdr->sh_type = SHT_STRTAB;
symstrtab_hdr->sh_flags = 0;
symstrtab_hdr->sh_addr = 0;
symstrtab_hdr->sh_entsize = 0;
symstrtab_hdr->sh_link = 0;
symstrtab_hdr->sh_info = 0;
symstrtab_hdr->sh_addralign = 0;
symstrtab_hdr->size = 0;
}
/* put the strtab out too... */
{
Elf_Internal_Shdr *this_hdr;
this_hdr = &elf_tdata(abfd)->shstrtab_hdr;
this_hdr->contents = (PTR) elf_shstrtab (abfd)->tab;
this_hdr->sh_size = elf_shstrtab (abfd)->length;
this_hdr->sh_type = SHT_STRTAB;
this_hdr->sh_flags = 0;
this_hdr->sh_addr = 0;
this_hdr->sh_entsize = 0;
this_hdr->sh_addralign = 0;
this_hdr->size = 0;
}
}
static boolean
write_shdrs_and_ehdr (abfd)
bfd *abfd;
{
Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
Elf_Internal_Phdr *i_phdrp = 0; /* Program header table, internal form */
Elf_External_Shdr *x_shdrp; /* Section header table, external form */
Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */
int count;
int scnt;
struct strtab *shstrtab;
i_ehdrp = elf_elfheader (abfd);
i_shdrp = elf_elfsections (abfd);
shstrtab = elf_shstrtab (abfd);
/* swap the header before spitting it out... */
#if DEBUG & 1
elf_debug_file (i_ehdrp);
#endif
elf_swap_ehdr_out (abfd, i_ehdrp, &x_ehdr);
bfd_seek (abfd, (file_ptr) 0, SEEK_SET);
bfd_write ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd);
/* at this point we've concocted all the ELF sections... */
x_shdrp = (Elf_External_Shdr *)
bfd_alloc (abfd, sizeof (*x_shdrp) * (i_ehdrp->e_shnum));
if (!x_shdrp)
{
bfd_error = no_memory;
return false;
}
for (count = 0; count < i_ehdrp->e_shnum; count++)
{
#if DEBUG & 2
elf_debug_section (shstrtab->tab + i_shdrp[count]->sh_name, count,
i_shdrp[count]);
#endif
elf_swap_shdr_out (abfd, i_shdrp[count], x_shdrp + count);
}
bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET);
bfd_write ((PTR) x_shdrp, sizeof (*x_shdrp), i_ehdrp->e_shnum, abfd);
/* need to dump the string table too... */
return true;
}
static void
assign_file_positions_for_relocs (abfd)
bfd *abfd;
{
file_ptr off = elf_tdata(abfd)->next_file_pos;
int i;
Elf_Internal_Shdr **shdrpp = elf_elfsections (abfd);
Elf_Internal_Shdr *shdrp;
for (i = 0; i < elf_elfheader(abfd)->e_shnum; i++)
{
shdrp = shdrpp[i];
if (shdrp->sh_type != SHT_REL && shdrp->sh_type != SHT_RELA)
continue;
off = assign_file_position_for_section (shdrp, off);
}
elf_tdata(abfd)->next_file_pos = off;
}
boolean
DEFUN (NAME(bfd_elf,write_object_contents), (abfd), bfd * abfd)
{
Elf_Internal_Ehdr *i_ehdrp;
Elf_Internal_Shdr **i_shdrp;
int count;
if (abfd->output_has_begun == false)
{
prep_headers (abfd);
elf_compute_section_file_positions (abfd);
abfd->output_has_begun = true;
}
i_shdrp = elf_elfsections (abfd);
i_ehdrp = elf_elfheader (abfd);
bfd_map_over_sections (abfd, write_relocs, (PTR) 0);
assign_file_positions_for_relocs (abfd);
/* After writing the headers, we need to write the sections too... */
for (count = 0; count < i_ehdrp->e_shnum; count++)
if (i_shdrp[count]->contents)
{
bfd_seek (abfd, i_shdrp[count]->sh_offset, SEEK_SET);
bfd_write (i_shdrp[count]->contents, i_shdrp[count]->sh_size, 1, abfd);
}
return write_shdrs_and_ehdr (abfd);
}
/* Given an index of a section, retrieve a pointer to it. Note
that for our purposes, sections are indexed by {1, 2, ...} with
0 being an illegal index. */
/* In the original, each ELF section went into exactly one BFD
section. This doesn't really make sense, so we need a real mapping.
The mapping has to hide in the Elf_Internal_Shdr since asection
doesn't have anything like a tdata field... */
static struct sec *
DEFUN (section_from_elf_index, (abfd, index),
bfd * abfd AND
int index)
{
/* @@ Is bfd_com_section really correct in all the places it could
be returned from this routine? */
if (index == SHN_ABS)
return &bfd_com_section; /* not abs? */
if (index == SHN_COMMON)
return &bfd_com_section;
if (index > elf_elfheader (abfd)->e_shnum)
return 0;
{
Elf_Internal_Shdr *hdr = elf_elfsections (abfd)[index];
switch (hdr->sh_type)
{
/* ELF sections that map to BFD sections */
case SHT_PROGBITS:
case SHT_NOBITS:
if (!hdr->rawdata)
bfd_section_from_shdr (abfd, index);
return (struct sec *) hdr->rawdata;
default:
return (struct sec *) &bfd_abs_section;
}
}
}
/* given a section, search the header to find them... */
static int
DEFUN (elf_section_from_bfd_section, (abfd, asect),
bfd * abfd AND
struct sec *asect)
{
Elf_Internal_Shdr **i_shdrp = elf_elfsections (abfd);
int index;
Elf_Internal_Shdr *hdr;
int maxindex = elf_elfheader (abfd)->e_shnum;
if (asect == &bfd_abs_section)
return SHN_ABS;
if (asect == &bfd_com_section)
return SHN_COMMON;
if (asect == &bfd_und_section)
return SHN_UNDEF;
for (index = 0; index < maxindex; index++)
{
hdr = i_shdrp[index];
switch (hdr->sh_type)
{
/* ELF sections that map to BFD sections */
case SHT_PROGBITS:
case SHT_NOBITS:
if (hdr->rawdata)
{
if (((struct sec *) (hdr->rawdata)) == asect)
return index;
}
break;
default:
break;
}
}
return -1;
}
/* given a symbol, return the bfd index for that symbol. */
static int
DEFUN (elf_symbol_from_bfd_symbol, (abfd, asym_ptr_ptr),
bfd * abfd AND
struct symbol_cache_entry **asym_ptr_ptr)
{
struct symbol_cache_entry *asym_ptr = *asym_ptr_ptr;
CONST char *name = asym_ptr->name;
int idx;
int symcount = bfd_get_symcount (abfd);
asymbol **syms = bfd_get_outsymbols (abfd);
/* FIXME -- there has to be a better way than linear search. */
for (idx = 0; idx < symcount; idx++)
{
if (syms[idx] == asym_ptr
|| (name == syms[idx]->name && name)
|| ((asym_ptr->flags & BSF_SECTION_SYM)
&& (syms[idx]->flags & BSF_SECTION_SYM)
&& asym_ptr->section == syms[idx]->section))
break;
}
if (idx >= symcount)
{
/* badness... */
fprintf (stderr, "bfd app err: can't find sym `%s' in symtab\n",
name);
abort ();
}
idx = elf_symtab_map (abfd)[idx];
#if DEBUG & 4
{
flagword flags = asym_ptr->flags;
fprintf (stderr,
"elfsym<-bfdsym %.8lx `%s' sec=%s symnum=%d {",
(long) asym_ptr, asym_ptr->name, asym_ptr->section->name, idx);
if (flags == BSF_NO_FLAGS)
fprintf (stderr, " none");
if (flags & BSF_LOCAL)
fprintf (stderr, " local");
if (flags & BSF_GLOBAL)
fprintf (stderr, " global");
if (flags & BSF_EXPORT)
fprintf (stderr, " export");
if (flags & BSF_DEBUGGING)
fprintf (stderr, " debugging");
if (flags & BSF_KEEP)
fprintf (stderr, " keep");
if (flags & BSF_KEEP_G)
fprintf (stderr, " keep_g");
if (flags & BSF_WEAK)
fprintf (stderr, " weak");
if (flags & BSF_SECTION_SYM)
fprintf (stderr, " section_sym");
if (flags & BSF_OLD_COMMON)
fprintf (stderr, " old_common");
if (flags & BSF_NOT_AT_END)
fprintf (stderr, " not_at_end");
if (flags & BSF_CONSTRUCTOR)
fprintf (stderr, " constructor");
if (flags & BSF_WARNING)
fprintf (stderr, " warning");
if (flags & BSF_INDIRECT)
fprintf (stderr, " indirect");
if (flags & BSF_FILE)
fprintf (stderr, " file");
if (flags & BSF_FUNCTION)
fprintf (stderr, " function");
fputs (" }\n", stderr);
fflush (stderr);
}
#endif
return idx;
}
static boolean
DEFUN (elf_slurp_symbol_table, (abfd, symptrs),
bfd * abfd AND
asymbol ** symptrs) /* Buffer for generated bfd symbols */
{
Elf_Internal_Shdr *hdr = &elf_tdata(abfd)->symtab_hdr;
int symcount; /* Number of external ELF symbols */
int i;
elf_symbol_type *sym; /* Pointer to current bfd symbol */
elf_symbol_type *symbase; /* Buffer for generated bfd symbols */
Elf_Internal_Sym i_sym;
Elf_External_Sym *x_symp;
/* this is only valid because there is only one symtab... */
/* FIXME: This is incorrect, there may also be a dynamic symbol
table which is a subset of the full symbol table. We either need
to be prepared to read both (and merge them) or ensure that we
only read the full symbol table. Currently we only get called to
read the full symbol table. -fnf */
if (bfd_get_outsymbols (abfd) != NULL)
{
return true;
}
/* Read each raw ELF symbol, converting from external ELF form to
internal ELF form, and then using the information to create a
canonical bfd symbol table entry.
Note that we allocate the initial bfd canonical symbol buffer
based on a one-to-one mapping of the ELF symbols to canonical
symbols. We actually use all the ELF symbols, so there will be no
space left over at the end. When we have all the symbols, we
build the caller's pointer vector. */
if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) == -1)
{
bfd_error = system_call_error;
return false;
}
symcount = hdr->sh_size / sizeof (Elf_External_Sym);
symbase = (elf_symbol_type *) bfd_zalloc (abfd, symcount * sizeof (elf_symbol_type));
sym = symbase;
/* Temporarily allocate room for the raw ELF symbols. */
x_symp = (Elf_External_Sym *) bfd_xmalloc (symcount * sizeof (Elf_External_Sym));
if (bfd_read ((PTR) x_symp, sizeof (Elf_External_Sym), symcount, abfd)
!= symcount * sizeof (Elf_External_Sym))
{
free ((PTR) x_symp);
bfd_error = system_call_error;
return false;
}
/* Skip first symbol, which is a null dummy. */
for (i = 1; i < symcount; i++)
{
elf_swap_symbol_in (abfd, x_symp + i, &i_sym);
memcpy (&sym->internal_elf_sym, &i_sym, sizeof (Elf_Internal_Sym));
memcpy (&sym->native_elf_sym, x_symp + i, sizeof (Elf_External_Sym));
sym->symbol.the_bfd = abfd;
sym->symbol.name = elf_string_from_elf_section (abfd, hdr->sh_link,
i_sym.st_name);
sym->symbol.value = i_sym.st_value;
if (i_sym.st_shndx > 0 && i_sym.st_shndx < SHN_LORESERV)
{
sym->symbol.section = section_from_elf_index (abfd, i_sym.st_shndx);
}
else if (i_sym.st_shndx == SHN_ABS)
{
sym->symbol.section = &bfd_abs_section;
}
else if (i_sym.st_shndx == SHN_COMMON)
{
sym->symbol.section = &bfd_com_section;
/* Elf puts the alignment into the `value' field, and the size
into the `size' field. BFD wants to see the size in the
value field, and doesn't care (at the moment) about the
alignment. */
sym->symbol.value = i_sym.st_size;
}
else if (i_sym.st_shndx == SHN_UNDEF)
{
sym->symbol.section = &bfd_und_section;
}
else
sym->symbol.section = &bfd_abs_section;
sym->symbol.value -= sym->symbol.section->vma;
switch (ELF_ST_BIND (i_sym.st_info))
{
case STB_LOCAL:
sym->symbol.flags |= BSF_LOCAL;
break;
case STB_GLOBAL:
sym->symbol.flags |= (BSF_GLOBAL | BSF_EXPORT);
break;
case STB_WEAK:
sym->symbol.flags |= BSF_WEAK;
break;
}
switch (ELF_ST_TYPE (i_sym.st_info))
{
case STT_SECTION:
sym->symbol.flags |= BSF_SECTION_SYM | BSF_DEBUGGING;
break;
case STT_FILE:
sym->symbol.flags |= BSF_FILE | BSF_DEBUGGING;
break;
case STT_FUNC:
sym->symbol.flags |= BSF_FUNCTION;
break;
}
/* Is this a definition of $global$? If so, keep it because it will be
needd if any relocations are performed. */
if (!strcmp (sym->symbol.name, "$global$")
&& sym->symbol.section != &bfd_und_section)
{
/* @@ Why is this referring to backend data and not a field of
abfd? FIXME */
struct elf_backend_data *be_data = (struct elf_backend_data *) abfd->xvec->backend_data;
be_data->global_sym = (PTR) sym;
}
sym++;
}
/* We rely on the zalloc to clear out the final symbol entry. */
/* obj_raw_syms macro uses a cast... */
elf_tdata (abfd)->raw_syms = (PTR) x_symp;
bfd_get_symcount (abfd) = symcount = sym - symbase;
/* Fill in the user's symbol pointer vector if needed. */
if (symptrs)
{
sym = symbase;
while (symcount-- > 0)
{
*symptrs++ = &sym->symbol;
sym++;
}
*symptrs = 0; /* Final null pointer */
}
return true;
}
/* Return the number of bytes required to hold the symtab vector.
Note that we base it on the count plus 1, since we will null terminate
the vector allocated based on this size. However, the ELF symbol table
always has a dummy entry as symbol #0, so it ends up even. */
unsigned int
DEFUN (elf_get_symtab_upper_bound, (abfd), bfd * abfd)
{
unsigned int symcount;
unsigned int symtab_size = 0;
Elf_Internal_Shdr *hdr = &elf_tdata(abfd)->symtab_hdr;
symcount = hdr->sh_size / sizeof (Elf_External_Sym);
symtab_size = (symcount - 1 + 1) * (sizeof (asymbol));
return symtab_size;
}
/*
This function return the number of bytes required to store the
relocation information associated with section <<sect>>
attached to bfd <<abfd>>
*/
unsigned int
elf_get_reloc_upper_bound (abfd, asect)
bfd *abfd;
sec_ptr asect;
{
if (asect->flags & SEC_RELOC)
{
/* either rel or rela */
return elf_section_data(asect)->rel_hdr.sh_size;
}
else
return 0;
}
static boolean
DEFUN (elf_slurp_reloca_table, (abfd, asect, symbols),
bfd * abfd AND
sec_ptr asect AND
asymbol ** symbols)
{
Elf_External_Rela *native_relocs;
arelent *reloc_cache;
arelent *cache_ptr;
unsigned int idx;
if (asect->relocation)
return true;
if (asect->reloc_count == 0)
return true;
if (asect->flags & SEC_CONSTRUCTOR)
return true;
bfd_seek (abfd, asect->rel_filepos, SEEK_SET);
native_relocs = (Elf_External_Rela *)
bfd_alloc (abfd, asect->reloc_count * sizeof (Elf_External_Rela));
bfd_read ((PTR) native_relocs,
sizeof (Elf_External_Rela), asect->reloc_count, abfd);
reloc_cache = (arelent *)
bfd_alloc (abfd, (size_t) (asect->reloc_count * sizeof (arelent)));
if (!reloc_cache)
{
bfd_error = no_memory;
return false;
}
for (idx = 0; idx < asect->reloc_count; idx++)
{
#ifdef RELOC_PROCESSING
Elf_Internal_Rela dst;
Elf_External_Rela *src;
cache_ptr = reloc_cache + idx;
src = native_relocs + idx;
elf_swap_reloca_in (abfd, src, &dst);
RELOC_PROCESSING (cache_ptr, &dst, symbols, abfd, asect);
#else
Elf_Internal_Rela dst;
Elf_External_Rela *src;
cache_ptr = reloc_cache + idx;
src = native_relocs + idx;
elf_swap_reloca_in (abfd, src, &dst);
if (asect->flags & SEC_RELOC)
{
/* relocatable, so the offset is off of the section */
cache_ptr->address = dst.r_offset + asect->vma;
}
else
{
/* non-relocatable, so the offset a virtual address */
cache_ptr->address = dst.r_offset;
}
/* ELF_R_SYM(dst.r_info) is the symbol table offset; subtract 1
because the first entry is NULL. */
cache_ptr->sym_ptr_ptr = symbols + ELF_R_SYM (dst.r_info) - 1;
{
/* Is it an ELF section symbol? If so, translate it into a
BFD section symbol. */
asymbol *s = *(cache_ptr->sym_ptr_ptr);
if (s->flags & BSF_SECTION_SYM)
cache_ptr->sym_ptr_ptr = s->section->symbol_ptr_ptr;
}
cache_ptr->addend = dst.r_addend;
/* Fill in the cache_ptr->howto field from dst.r_type */
{
struct elf_backend_data *ebd = get_elf_backend_data (abfd);
(*ebd->elf_info_to_howto) (abfd, cache_ptr, &dst);
}
#endif
}
asect->relocation = reloc_cache;
return true;
}
#ifdef DEBUG
static void
elf_debug_section (str, num, hdr)
char *str;
int num;
Elf_Internal_Shdr *hdr;
{
fprintf (stderr, "\nSection#%d '%s' 0x%.8lx\n", num, str, (long) hdr);
fprintf (stderr,
"sh_name = %ld\tsh_type = %ld\tsh_flags = %ld\n",
(long) hdr->sh_name,
(long) hdr->sh_type,
(long) hdr->sh_flags);
fprintf (stderr,
"sh_addr = %ld\tsh_offset = %ld\tsh_size = %ld\n",
(long) hdr->sh_addr,
(long) hdr->sh_offset,
(long) hdr->sh_size);
fprintf (stderr,
"sh_link = %ld\tsh_info = %ld\tsh_addralign = %ld\n",
(long) hdr->sh_link,
(long) hdr->sh_info,
(long) hdr->sh_addralign);
fprintf (stderr, "sh_entsize = %ld\n",
(long) hdr->sh_entsize);
fprintf (stderr, "rawdata = 0x%.8lx\n", (long) hdr->rawdata);
fprintf (stderr, "contents = 0x%.8lx\n", (long) hdr->contents);
fprintf (stderr, "size = %ld\n", (long) hdr->size);
fflush (stderr);
}
static void
elf_debug_file (ehdrp)
Elf_Internal_Ehdr *ehdrp;
{
fprintf (stderr, "e_entry = 0x%.8lx\n", (long) ehdrp->e_entry);
fprintf (stderr, "e_phoff = %ld\n", (long) ehdrp->e_phoff);
fprintf (stderr, "e_phnum = %ld\n", (long) ehdrp->e_phnum);
fprintf (stderr, "e_phentsize = %ld\n", (long) ehdrp->e_phentsize);
fprintf (stderr, "e_shoff = %ld\n", (long) ehdrp->e_shoff);
fprintf (stderr, "e_shnum = %ld\n", (long) ehdrp->e_shnum);
fprintf (stderr, "e_shentsize = %ld\n", (long) ehdrp->e_shentsize);
}
#endif
static boolean
DEFUN (elf_slurp_reloc_table, (abfd, asect, symbols),
bfd * abfd AND
sec_ptr asect AND
asymbol ** symbols)
{
Elf_External_Rel *native_relocs;
arelent *reloc_cache;
arelent *cache_ptr;
Elf_Internal_Shdr *data_hdr;
ElfNAME (Off) data_off;
ElfNAME (Word) data_max;
char buf[4]; /* FIXME -- might be elf64 */
unsigned int idx;
if (asect->relocation)
return true;
if (asect->reloc_count == 0)
return true;
if (asect->flags & SEC_CONSTRUCTOR)
return true;
bfd_seek (abfd, asect->rel_filepos, SEEK_SET);
native_relocs = (Elf_External_Rel *)
bfd_alloc (abfd, asect->reloc_count * sizeof (Elf_External_Rel));
bfd_read ((PTR) native_relocs,
sizeof (Elf_External_Rel), asect->reloc_count, abfd);
reloc_cache = (arelent *)
bfd_alloc (abfd, (size_t) (asect->reloc_count * sizeof (arelent)));
if (!reloc_cache)
{
bfd_error = no_memory;
return false;
}
/* Get the offset of the start of the segment we are relocating to read in
the implicit addend. */
data_hdr = &elf_section_data(asect)->this_hdr;
data_off = data_hdr->sh_offset;
data_max = data_hdr->sh_size - sizeof (buf) + 1;
#if DEBUG & 2
elf_debug_section ("data section", -1, data_hdr);
#endif
for (idx = 0; idx < asect->reloc_count; idx++)
{
#ifdef RELOC_PROCESSING
Elf_Internal_Rel dst;
Elf_External_Rel *src;
cache_ptr = reloc_cache + idx;
src = native_relocs + idx;
elf_swap_reloc_in (abfd, src, &dst);
RELOC_PROCESSING (cache_ptr, &dst, symbols, abfd, asect);
#else
Elf_Internal_Rel dst;
Elf_External_Rel *src;
cache_ptr = reloc_cache + idx;
src = native_relocs + idx;
elf_swap_reloc_in (abfd, src, &dst);
if (asect->flags & SEC_RELOC)
{
/* relocatable, so the offset is off of the section */
cache_ptr->address = dst.r_offset + asect->vma;
}
else
{
/* non-relocatable, so the offset a virtual address */
cache_ptr->address = dst.r_offset;
}
/* ELF_R_SYM(dst.r_info) is the symbol table offset...
-1 is to skip the dummy symbol table entry */
cache_ptr->sym_ptr_ptr = symbols + ELF_R_SYM (dst.r_info) - 1;
BFD_ASSERT (dst.r_offset <= data_max);
if (bfd_seek (abfd, data_off + dst.r_offset, SEEK_SET) != 0
|| bfd_read ((PTR) buf, sizeof (buf), 1, abfd) != sizeof (buf))
{
bfd_error = system_call_error;
return false;
}
cache_ptr->addend = (*abfd->xvec->bfd_getx_signed_32) ((bfd_byte *) buf);
/* Fill in the cache_ptr->howto field from dst.r_type */
{
struct elf_backend_data *ebd = get_elf_backend_data (abfd);
(*ebd->elf_info_to_howto_rel) (abfd, cache_ptr, &dst);
}
#endif
}
asect->relocation = reloc_cache;
return true;
}
unsigned int
elf_canonicalize_reloc (abfd, section, relptr, symbols)
bfd *abfd;
sec_ptr section;
arelent **relptr;
asymbol **symbols;
{
arelent *tblptr = section->relocation;
unsigned int count = 0;
int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
/* snarfed from coffcode.h */
if (use_rela_p)
elf_slurp_reloca_table (abfd, section, symbols);
else
elf_slurp_reloc_table (abfd, section, symbols);
tblptr = section->relocation;
if (!tblptr)
return 0;
for (; count++ < section->reloc_count;)
*relptr++ = tblptr++;
*relptr = 0;
return section->reloc_count;
}
unsigned int
DEFUN (elf_get_symtab, (abfd, alocation),
bfd * abfd AND
asymbol ** alocation)
{
if (!elf_slurp_symbol_table (abfd, alocation))
return 0;
else
return bfd_get_symcount (abfd);
}
asymbol *
DEFUN (elf_make_empty_symbol, (abfd),
bfd * abfd)
{
elf_symbol_type *newsym;
newsym = (elf_symbol_type *) bfd_zalloc (abfd, sizeof (elf_symbol_type));
if (!newsym)
{
bfd_error = no_memory;
return NULL;
}
else
{
newsym->symbol.the_bfd = abfd;
return &newsym->symbol;
}
}
void
DEFUN (elf_get_symbol_info, (ignore_abfd, symbol, ret),
bfd * ignore_abfd AND
asymbol * symbol AND
symbol_info * ret)
{
bfd_symbol_info (symbol, ret);
}
void
DEFUN (elf_print_symbol, (ignore_abfd, filep, symbol, how),
bfd * ignore_abfd AND
PTR filep AND
asymbol * symbol AND
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;
section_name = symbol->section ? symbol->section->name : "(*none*)";
bfd_print_symbol_vandf ((PTR) file, symbol);
fprintf (file, " %s\t%s",
section_name,
symbol->name);
}
break;
}
}
alent *
DEFUN (elf_get_lineno, (ignore_abfd, symbol),
bfd * ignore_abfd AND
asymbol * symbol)
{
fprintf (stderr, "elf_get_lineno unimplemented\n");
fflush (stderr);
BFD_FAIL ();
return NULL;
}
boolean
DEFUN (elf_set_arch_mach, (abfd, arch, machine),
bfd * abfd AND
enum bfd_architecture arch AND
unsigned long machine)
{
/* Allow any architecture to be supported by the elf backend */
switch (arch)
{
case bfd_arch_unknown: /* EM_NONE */
case bfd_arch_sparc: /* EM_SPARC */
case bfd_arch_i386: /* EM_386 */
case bfd_arch_m68k: /* EM_68K */
case bfd_arch_m88k: /* EM_88K */
case bfd_arch_i860: /* EM_860 */
case bfd_arch_mips: /* EM_MIPS (MIPS R3000) */
case bfd_arch_hppa: /* EM_HPPA (HP PA_RISC) */
return bfd_default_set_arch_mach (abfd, arch, machine);
default:
return false;
}
}
boolean
DEFUN (elf_find_nearest_line, (abfd,
section,
symbols,
offset,
filename_ptr,
functionname_ptr,
line_ptr),
bfd * abfd AND
asection * section AND
asymbol ** symbols AND
bfd_vma offset AND
CONST char **filename_ptr AND
CONST char **functionname_ptr AND
unsigned int *line_ptr)
{
return false;
}
int
DEFUN (elf_sizeof_headers, (abfd, reloc),
bfd * abfd AND
boolean reloc)
{
fprintf (stderr, "elf_sizeof_headers unimplemented\n");
fflush (stderr);
BFD_FAIL ();
return 0;
}
boolean
DEFUN (elf_set_section_contents, (abfd, section, location, offset, count),
bfd * abfd AND
sec_ptr section AND
PTR location AND
file_ptr offset AND
bfd_size_type count)
{
Elf_Internal_Shdr *hdr;
if (abfd->output_has_begun == false) /* set by bfd.c handler? */
{
/* do setup calculations (FIXME) */
prep_headers (abfd);
elf_compute_section_file_positions (abfd);
abfd->output_has_begun = true;
}
hdr = &elf_section_data(section)->this_hdr;
if (bfd_seek (abfd, hdr->sh_offset + offset, SEEK_SET) == -1)
return false;
if (bfd_write (location, 1, count, abfd) != count)
return false;
return true;
}
void
DEFUN (elf_no_info_to_howto, (abfd, cache_ptr, dst),
bfd * abfd AND
arelent * cache_ptr AND
Elf_Internal_Rela * dst)
{
fprintf (stderr, "elf RELA relocation support for target machine unimplemented\n");
fflush (stderr);
BFD_FAIL ();
}
void
DEFUN (elf_no_info_to_howto_rel, (abfd, cache_ptr, dst),
bfd * abfd AND
arelent * cache_ptr AND
Elf_Internal_Rel * dst)
{
fprintf (stderr, "elf REL relocation support for target machine unimplemented\n");
fflush (stderr);
BFD_FAIL ();
}
/* Core file support */
#ifdef HAVE_PROCFS /* Some core file support requires host /proc files */
#include <sys/procfs.h>
#else
#define bfd_prstatus(abfd, descdata, descsz, filepos) /* Define away */
#define bfd_fpregset(abfd, descdata, descsz, filepos) /* Define away */
#define bfd_prpsinfo(abfd, descdata, descsz, filepos) /* Define away */
#endif
#ifdef HAVE_PROCFS
static void
DEFUN (bfd_prstatus, (abfd, descdata, descsz, filepos),
bfd * abfd AND
char *descdata AND
int descsz AND
long filepos)
{
asection *newsect;
prstatus_t *status = (prstatus_t *) 0;
if (descsz == sizeof (prstatus_t))
{
newsect = bfd_make_section (abfd, ".reg");
newsect->_raw_size = sizeof (status->pr_reg);
newsect->filepos = filepos + (long) &status->pr_reg;
newsect->flags = SEC_ALLOC | SEC_HAS_CONTENTS;
newsect->alignment_power = 2;
if ((core_prstatus (abfd) = bfd_alloc (abfd, descsz)) != NULL)
{
memcpy (core_prstatus (abfd), descdata, descsz);
}
}
}
/* Stash a copy of the prpsinfo structure away for future use. */
static void
DEFUN (bfd_prpsinfo, (abfd, descdata, descsz, filepos),
bfd * abfd AND
char *descdata AND
int descsz AND
long filepos)
{
asection *newsect;
if (descsz == sizeof (prpsinfo_t))
{
if ((core_prpsinfo (abfd) = bfd_alloc (abfd, descsz)) != NULL)
{
memcpy (core_prpsinfo (abfd), descdata, descsz);
}
}
}
static void
DEFUN (bfd_fpregset, (abfd, descdata, descsz, filepos),
bfd * abfd AND
char *descdata AND
int descsz AND
long filepos)
{
asection *newsect;
newsect = bfd_make_section (abfd, ".reg2");
newsect->_raw_size = descsz;
newsect->filepos = filepos;
newsect->flags = SEC_ALLOC | SEC_HAS_CONTENTS;
newsect->alignment_power = 2;
}
#endif /* HAVE_PROCFS */
/* Return a pointer to the args (including the command name) that were
seen by the program that generated the core dump. Note that for
some reason, a spurious space is tacked onto the end of the args
in some (at least one anyway) implementations, so strip it off if
it exists. */
char *
DEFUN (elf_core_file_failing_command, (abfd),
bfd * abfd)
{
#ifdef HAVE_PROCFS
if (core_prpsinfo (abfd))
{
prpsinfo_t *p = core_prpsinfo (abfd);
char *scan = p->pr_psargs;
while (*scan++)
{;
}
scan -= 2;
if ((scan > p->pr_psargs) && (*scan == ' '))
{
*scan = '\000';
}
return p->pr_psargs;
}
#endif
return NULL;
}
/* Return the number of the signal that caused the core dump. Presumably,
since we have a core file, we got a signal of some kind, so don't bother
checking the other process status fields, just return the signal number.
*/
int
DEFUN (elf_core_file_failing_signal, (abfd),
bfd * abfd)
{
#ifdef HAVE_PROCFS
if (core_prstatus (abfd))
{
return ((prstatus_t *) (core_prstatus (abfd)))->pr_cursig;
}
#endif
return -1;
}
/* Check to see if the core file could reasonably be expected to have
come for the current executable file. Note that by default we return
true unless we find something that indicates that there might be a
problem.
*/
boolean
DEFUN (elf_core_file_matches_executable_p, (core_bfd, exec_bfd),
bfd * core_bfd AND
bfd * exec_bfd)
{
#ifdef HAVE_PROCFS
char *corename;
char *execname;
#endif
/* First, xvecs must match since both are ELF files for the same target. */
if (core_bfd->xvec != exec_bfd->xvec)
{
bfd_error = system_call_error;
return false;
}
#ifdef HAVE_PROCFS
/* If no prpsinfo, just return true. Otherwise, grab the last component
of the exec'd pathname from the prpsinfo. */
if (core_prpsinfo (core_bfd))
{
corename = (((struct prpsinfo *) core_prpsinfo (core_bfd))->pr_fname);
}
else
{
return true;
}
/* Find the last component of the executable pathname. */
if ((execname = strrchr (exec_bfd->filename, '/')) != NULL)
{
execname++;
}
else
{
execname = (char *) exec_bfd->filename;
}
/* See if they match */
return strcmp (execname, corename) ? false : true;
#else
return true;
#endif /* HAVE_PROCFS */
}
/* ELF core files contain a segment of type PT_NOTE, that holds much of
the information that would normally be available from the /proc interface
for the process, at the time the process dumped core. Currently this
includes copies of the prstatus, prpsinfo, and fpregset structures.
Since these structures are potentially machine dependent in size and
ordering, bfd provides two levels of support for them. The first level,
available on all machines since it does not require that the host
have /proc support or the relevant include files, is to create a bfd
section for each of the prstatus, prpsinfo, and fpregset structures,
without any interpretation of their contents. With just this support,
the bfd client will have to interpret the structures itself. Even with
/proc support, it might want these full structures for it's own reasons.
In the second level of support, where HAVE_PROCFS is defined, bfd will
pick apart the structures to gather some additional information that
clients may want, such as the general register set, the name of the
exec'ed file and its arguments, the signal (if any) that caused the
core dump, etc.
*/
static boolean
DEFUN (elf_corefile_note, (abfd, hdr),
bfd * abfd AND
Elf_Internal_Phdr * hdr)
{
Elf_External_Note *x_note_p; /* Elf note, external form */
Elf_Internal_Note i_note; /* Elf note, internal form */
char *buf = NULL; /* Entire note segment contents */
char *namedata; /* Name portion of the note */
char *descdata; /* Descriptor portion of the note */
char *sectname; /* Name to use for new section */
long filepos; /* File offset to descriptor data */
asection *newsect;
if (hdr->p_filesz > 0
&& (buf = (char *) bfd_xmalloc (hdr->p_filesz)) != NULL
&& bfd_seek (abfd, hdr->p_offset, SEEK_SET) != -1
&& bfd_read ((PTR) buf, hdr->p_filesz, 1, abfd) == hdr->p_filesz)
{
x_note_p = (Elf_External_Note *) buf;
while ((char *) x_note_p < (buf + hdr->p_filesz))
{
i_note.namesz = bfd_h_get_32 (abfd, (bfd_byte *) x_note_p->namesz);
i_note.descsz = bfd_h_get_32 (abfd, (bfd_byte *) x_note_p->descsz);
i_note.type = bfd_h_get_32 (abfd, (bfd_byte *) x_note_p->type);
namedata = x_note_p->name;
descdata = namedata + BFD_ALIGN (i_note.namesz, 4);
filepos = hdr->p_offset + (descdata - buf);
switch (i_note.type)
{
case NT_PRSTATUS:
/* process descdata as prstatus info */
bfd_prstatus (abfd, descdata, i_note.descsz, filepos);
sectname = ".prstatus";
break;
case NT_FPREGSET:
/* process descdata as fpregset info */
bfd_fpregset (abfd, descdata, i_note.descsz, filepos);
sectname = ".fpregset";
break;
case NT_PRPSINFO:
/* process descdata as prpsinfo */
bfd_prpsinfo (abfd, descdata, i_note.descsz, filepos);
sectname = ".prpsinfo";
break;
default:
/* Unknown descriptor, just ignore it. */
sectname = NULL;
break;
}
if (sectname != NULL)
{
newsect = bfd_make_section (abfd, sectname);
newsect->_raw_size = i_note.descsz;
newsect->filepos = filepos;
newsect->flags = SEC_ALLOC | SEC_HAS_CONTENTS;
newsect->alignment_power = 2;
}
x_note_p = (Elf_External_Note *)
(descdata + BFD_ALIGN (i_note.descsz, 4));
}
}
if (buf != NULL)
{
free (buf);
}
return true;
}
/* Core files are simply standard ELF formatted files that partition
the file using the execution view of the file (program header table)
rather than the linking view. In fact, there is no section header
table in a core file.
The process status information (including the contents of the general
register set) and the floating point register set are stored in a
segment of type PT_NOTE. We handcraft a couple of extra bfd sections
that allow standard bfd access to the general registers (.reg) and the
floating point registers (.reg2).
*/
bfd_target *
DEFUN (elf_core_file_p, (abfd), bfd * abfd)
{
Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
Elf_External_Phdr x_phdr; /* Program header table entry, external form */
Elf_Internal_Phdr *i_phdrp; /* Program header table, internal form */
unsigned int phindex;
/* Read in the ELF header in external format. */
if (bfd_read ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr))
{
bfd_error = system_call_error;
return NULL;
}
/* Now check to see if we have a valid ELF file, and one that BFD can
make use of. The magic number must match, the address size ('class')
and byte-swapping must match our XVEC entry, and it must have a
program header table (FIXME: See comments re segments at top of this
file). */
if (elf_file_p (&x_ehdr) == false)
{
wrong:
bfd_error = wrong_format;
return NULL;
}
/* FIXME, Check EI_VERSION here ! */
{
#if ARCH_SIZE == 32
int desired_address_size = ELFCLASS32;
#endif
#if ARCH_SIZE == 64
int desired_address_size = ELFCLASS64;
#endif
if (x_ehdr.e_ident[EI_CLASS] != desired_address_size)
goto wrong;
}
/* Switch xvec to match the specified byte order. */
switch (x_ehdr.e_ident[EI_DATA])
{
case ELFDATA2MSB: /* Big-endian */
if (abfd->xvec->byteorder_big_p == false)
goto wrong;
break;
case ELFDATA2LSB: /* Little-endian */
if (abfd->xvec->byteorder_big_p == true)
goto wrong;
break;
case ELFDATANONE: /* No data encoding specified */
default: /* Unknown data encoding specified */
goto wrong;
}
/* Allocate an instance of the elf_obj_tdata structure and hook it up to
the tdata pointer in the bfd. */
elf_tdata (abfd) =
(struct elf_obj_tdata *) bfd_zalloc (abfd, sizeof (struct elf_obj_tdata));
if (elf_tdata (abfd) == NULL)
{
bfd_error = no_memory;
return NULL;
}
/* FIXME, `wrong' returns from this point onward, leak memory. */
/* Now that we know the byte order, swap in the rest of the header */
i_ehdrp = elf_elfheader (abfd);
elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp);
#if DEBUG & 1
elf_debug_file (i_ehdrp);
#endif
/* If there is no program header, or the type is not a core file, then
we are hosed. */
if (i_ehdrp->e_phoff == 0 || i_ehdrp->e_type != ET_CORE)
goto wrong;
/* Allocate space for a copy of the program header table in
internal form, seek to the program header table in the file,
read it in, and convert it to internal form. As a simple sanity
check, verify that the what BFD thinks is the size of each program
header table entry actually matches the size recorded in the file. */
if (i_ehdrp->e_phentsize != sizeof (x_phdr))
goto wrong;
i_phdrp = (Elf_Internal_Phdr *)
bfd_alloc (abfd, sizeof (*i_phdrp) * i_ehdrp->e_phnum);
if (!i_phdrp)
{
bfd_error = no_memory;
return NULL;
}
if (bfd_seek (abfd, i_ehdrp->e_phoff, SEEK_SET) == -1)
{
bfd_error = system_call_error;
return NULL;
}
for (phindex = 0; phindex < i_ehdrp->e_phnum; phindex++)
{
if (bfd_read ((PTR) & x_phdr, sizeof (x_phdr), 1, abfd)
!= sizeof (x_phdr))
{
bfd_error = system_call_error;
return NULL;
}
elf_swap_phdr_in (abfd, &x_phdr, i_phdrp + phindex);
}
/* Once all of the program headers have been read and converted, we
can start processing them. */
for (phindex = 0; phindex < i_ehdrp->e_phnum; phindex++)
{
bfd_section_from_phdr (abfd, i_phdrp + phindex, phindex);
if ((i_phdrp + phindex)->p_type == PT_NOTE)
{
elf_corefile_note (abfd, i_phdrp + phindex);
}
}
/* Remember the entry point specified in the ELF file header. */
bfd_get_start_address (abfd) = i_ehdrp->e_entry;
return abfd->xvec;
}
Reference in a new issue View git blame Copy permalink