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|
/* Object file "section" support for the BFD library.
Copyright (C) 1990-1991 Free Software Foundation, Inc.
Written by Cygnus Support.
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. */
/*
SECTION
Sections
Sections are supported in BFD in <<section.c>>.
The raw data contained within a BFD is maintained through the
section abstraction. A single BFD may have any number of
sections, and keeps hold of them by pointing to the first,
each one points to the next in the list.
@menu
@* Section Input::
@* Section Output::
@* typedef asection::
@* section prototypes::
@end menu
INODE
Section Input, Section Output, Sections, Sections
SUBSECTION
Section Input
When a BFD is opened for reading, the section structures are
created and attached to the BFD.
Each section has a name which describes the section in the
outside world - for example, <<a.out>> would contain at least
three sections, called <<.text>>, <<.data>> and <<.bss>>.
Sometimes a BFD will contain more than the 'natural' number of
sections. A back end may attach other sections containing
constructor data, or an application may add a section (using
bfd_make_section) to the sections attached to an already open
BFD. For example, the linker creates a supernumary section
<<COMMON>> for each input file's BFD to hold information about
common storage.
The raw data is not necessarily read in at the same time as
the section descriptor is created. Some targets may leave the
data in place until a <<bfd_get_section_contents>> call is
made. Other back ends may read in all the data at once - For
example; an S-record file has to be read once to determine the
size of the data. An IEEE-695 file doesn't contain raw data in
sections, but data and relocation expressions intermixed, so
the data area has to be parsed to get out the data and
relocations.
INODE
Section Output, typedef asection, Section Input, Sections
SUBSECTION
Section Output
To write a new object style BFD, the various sections to be
written have to be created. They are attached to the BFD in
the same way as input sections, data is written to the
sections using <<bfd_set_section_contents>>.
Any program that creates or combines sections (e.g., the assembler
and linker) must use the fields <<output_section>> and
<<output_offset>> to indicate the file sections to which each
section must be written. (If the section is being created from
scratch, <<output_section>> should probably point to the section
itself, and <<output_offset>> should probably be zero.)
The data to be written comes from input sections attached to
the output sections. The output section structure can be
considered a filter for the input section, the output section
determines the vma of the output data and the name, but the
input section determines the offset into the output section of
the data to be written.
E.g., to create a section "O", starting at 0x100, 0x123 long,
containing two subsections, "A" at offset 0x0 (ie at vma
0x100) and "B" at offset 0x20 (ie at vma 0x120) the structures
would look like:
| section name "A"
| output_offset 0x00
| size 0x20
| output_section -----------> section name "O"
| | vma 0x100
| section name "B" | size 0x123
| output_offset 0x20 |
| size 0x103 |
| output_section --------|
SUBSECTION
Seglets
The data within a section is stored in a <<seglet>>. These
are much like the fixups in <<gas>>. The seglet abstraction
allows the a section to grow and shrink within itself.
A seglet knows how big it is, and which is the next seglet and
where the raw data for it is, and also points to a list of
relocations which apply to it.
The seglet is used by the linker to perform relaxing on final
code. The application creates code which is as big as
necessary to make it work without relaxing, and the user can
select whether to relax. Sometimes relaxing takes a lot of
time. The linker runs around the relocations to see if any
are attached to data which can be shrunk, if so it does it on
a seglet by seglet basis.
*/
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
/*
DOCDD
INODE
typedef asection, section prototypes, Section Output, Sections
SUBSECTION
typedef asection
The shape of a section struct:
CODE_FRAGMENT
.
.typedef struct sec
.{
. {* The name of the section, the name isn't a copy, the pointer is
. the same as that passed to bfd_make_section. *}
.
. CONST char *name;
.
.
. {* Which section is it 0.nth *}
.
. int index;
.
. {* The next section in the list belonging to the BFD, or NULL. *}
.
. struct sec *next;
.
. {* The field flags contains attributes of the section. Some of
. flags are read in from the object file, and some are
. synthesized from other information. *}
.
. flagword flags;
.
.#define SEC_NO_FLAGS 0x000
.
. {* Tells the OS to allocate space for this section when loaded.
. This would clear for a section containing debug information
. only. *}
.
.
.#define SEC_ALLOC 0x001
. {* Tells the OS to load the section from the file when loading.
. This would be clear for a .bss section *}
.
.#define SEC_LOAD 0x002
. {* The section contains data still to be relocated, so there will
. be some relocation information too. *}
.
.#define SEC_RELOC 0x004
.
. {* Obsolete ? *}
.
.#define SEC_BALIGN 0x008
.
. {* A signal to the OS that the section contains read only
. data. *}
.#define SEC_READONLY 0x010
.
. {* The section contains code only. *}
.
.#define SEC_CODE 0x020
.
. {* The section contains data only. *}
.
.#define SEC_DATA 0x040
.
. {* The section will reside in ROM. *}
.
.#define SEC_ROM 0x080
.
. {* The section contains constructor information. This section
. type is used by the linker to create lists of constructors and
. destructors used by <<g++>>. When a back end sees a symbol
. which should be used in a constructor list, it creates a new
. section for the type of name (eg <<__CTOR_LIST__>>), attaches
. the symbol to it and builds a relocation. To build the lists
. of constructors, all the linker has to to is catenate all the
. sections called <<__CTOR_LIST__>> and relocte the data
. contained within - exactly the operations it would peform on
. standard data. *}
.
.#define SEC_CONSTRUCTOR 0x100
.
. {* The section is a constuctor, and should be placed at the
. end of the . *}
.
.
.#define SEC_CONSTRUCTOR_TEXT 0x1100
.
.#define SEC_CONSTRUCTOR_DATA 0x2100
.
.#define SEC_CONSTRUCTOR_BSS 0x3100
.
.
. {* The section has contents - a bss section could be
. <<SEC_ALLOC>> | <<SEC_HAS_CONTENTS>>, a debug section could be
. <<SEC_HAS_CONTENTS>> *}
.
.#define SEC_HAS_CONTENTS 0x200
.
. {* An instruction to the linker not to output sections
. containing this flag even if they have information which
. would normally be written. *}
.
.#define SEC_NEVER_LOAD 0x400
.
.
.
. bfd_vma vma;
. boolean user_set_vma;
.
. {* The size of the section in bytes, as it will be output.
. contains a value even if the section has no contents (eg, the
. size of <<.bss>>). This will be filled in after relocation *}
.
. bfd_size_type _cooked_size;
.
. {* The size on disk of the section in bytes originally. Normally this
. value is the same as the size, but if some relaxing has
. been done, then this value will be bigger. *}
.
. bfd_size_type _raw_size;
.
. {* If this section is going to be output, then this value is the
. offset into the output section of the first byte in the input
. section. Eg, if this was going to start at the 100th byte in
. the output section, this value would be 100. *}
.
. bfd_vma output_offset;
.
. {* The output section through which to map on output. *}
.
. struct sec *output_section;
.
. {* The alignment requirement of the section, as an exponent - eg
. 3 aligns to 2^3 (or 8) *}
.
. unsigned int alignment_power;
.
. {* If an input section, a pointer to a vector of relocation
. records for the data in this section. *}
.
. struct reloc_cache_entry *relocation;
.
. {* If an output section, a pointer to a vector of pointers to
. relocation records for the data in this section. *}
.
. struct reloc_cache_entry **orelocation;
.
. {* The number of relocation records in one of the above *}
.
. unsigned reloc_count;
.
. {* Information below is back end specific - and not always used
. or updated
.
. File position of section data *}
.
. file_ptr filepos;
.
. {* File position of relocation info *}
.
. file_ptr rel_filepos;
.
. {* File position of line data *}
.
. file_ptr line_filepos;
.
. {* Pointer to data for applications *}
.
. PTR userdata;
.
. struct lang_output_section *otheruserdata;
.
. {* Attached line number information *}
.
. alent *lineno;
.
. {* Number of line number records *}
.
. unsigned int lineno_count;
.
. {* When a section is being output, this value changes as more
. linenumbers are written out *}
.
. file_ptr moving_line_filepos;
.
. {* what the section number is in the target world *}
.
. int target_index;
.
. PTR used_by_bfd;
.
. {* If this is a constructor section then here is a list of the
. relocations created to relocate items within it. *}
.
. struct relent_chain *constructor_chain;
.
. {* The BFD which owns the section. *}
.
. bfd *owner;
.
. boolean reloc_done;
. {* A symbol which points at this section only *}
. struct symbol_cache_entry *symbol;
. struct symbol_cache_entry **symbol_ptr_ptr;
. struct bfd_seclet_struct *seclets_head;
. struct bfd_seclet_struct *seclets_tail;
.} asection ;
.
.
.#define BFD_ABS_SECTION_NAME "*ABS*"
.#define BFD_UND_SECTION_NAME "*UND*"
.#define BFD_COM_SECTION_NAME "*COM*"
.
. {* the absolute section *}
. extern asection bfd_abs_section;
. {* Pointer to the undefined section *}
. extern asection bfd_und_section;
. {* Pointer to the common section *}
. extern asection bfd_com_section;
.
. extern struct symbol_cache_entry *bfd_abs_symbol;
. extern struct symbol_cache_entry *bfd_com_symbol;
. extern struct symbol_cache_entry *bfd_und_symbol;
.#define bfd_get_section_size_before_reloc(section) \
. (section->reloc_done ? (abort(),1): (section)->_raw_size)
.#define bfd_get_section_size_after_reloc(section) \
. ((section->reloc_done) ? (section)->_cooked_size: (abort(),1))
*/
/* These symbols are global, not specific to any BFD. Therefore, anything
that tries to change them is broken, and should be repaired. */
static CONST asymbol global_syms[] = {
/* bfd, name, value, attr, section [, udata] */
{ 0, BFD_COM_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_com_section },
{ 0, BFD_UND_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_und_section },
{ 0, BFD_ABS_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_abs_section },
};
#define STD_SECTION(SEC,SYM,NAME, IDX) \
asymbol *SYM = (asymbol *) &global_syms[IDX]; \
asection SEC = { NAME, 0, 0, 0, 0, (boolean) 0, 0, 0, 0, &SEC,\
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (boolean) 0, \
(asymbol *) &global_syms[IDX], &SYM, }
STD_SECTION (bfd_com_section, bfd_com_symbol, BFD_COM_SECTION_NAME, 0);
STD_SECTION (bfd_und_section, bfd_und_symbol, BFD_UND_SECTION_NAME, 1);
STD_SECTION (bfd_abs_section, bfd_abs_symbol, BFD_ABS_SECTION_NAME, 2);
#undef STD_SECTION
/*
DOCDD
INODE
section prototypes, , typedef asection, Sections
SUBSECTION
section prototypes
These are the functions exported by the section handling part of
<<libbfd>.
*/
/*
FUNCTION
bfd_get_section_by_name
SYNOPSIS
asection *bfd_get_section_by_name(bfd *abfd, CONST char *name);
DESCRIPTION
Runs through the provided @var{abfd} and returns the
<<asection>> who's name matches that provided, otherwise NULL.
@xref{Sections}, for more information.
*/
asection *
DEFUN(bfd_get_section_by_name,(abfd, name),
bfd *abfd AND
CONST char *name)
{
asection *sect;
for (sect = abfd->sections; sect != NULL; sect = sect->next)
if (!strcmp (sect->name, name)) return sect;
return NULL;
}
/*
FUNCTION
bfd_make_section_old_way
SYNOPSIS
asection *bfd_make_section_old_way(bfd *, CONST char *name);
DESCRIPTION
This function creates a new empty section called @var{name}
and attaches it to the end of the chain of sections for the
BFD supplied. An attempt to create a section with a name which
is already in use, returns its pointer without changing the
section chain.
It has the funny name since this is the way it used to be
before is was rewritten...
Possible errors are:
o invalid_operation -
If output has already started for this BFD.
o no_memory -
If obstack alloc fails.
*/
asection *
DEFUN(bfd_make_section_old_way,(abfd, name),
bfd *abfd AND
CONST char * name)
{
asection *sec = bfd_get_section_by_name(abfd, name);
if (sec == (asection *)NULL)
{
sec = bfd_make_section(abfd, name);
}
return sec;
}
/*
FUNCTION
bfd_make_section
SYNOPSIS
asection * bfd_make_section(bfd *, CONST char *name);
DESCRIPTION
This function creates a new empty section called @var{name}
and attaches it to the end of the chain of sections for the
BFD supplied. An attempt to create a section with a name which
is already in use, returns NULL without changing the section
chain.
Possible errors are:
o invalid_operation - If output has already started for this BFD.
o no_memory - If obstack alloc fails.
*/
sec_ptr
DEFUN(bfd_make_section,(abfd, name),
bfd *abfd AND
CONST char * name)
{
asection *newsect;
asection ** prev = &abfd->sections;
asection * sect = abfd->sections;
if (abfd->output_has_begun) {
bfd_error = invalid_operation;
return NULL;
}
if (strcmp(name, BFD_ABS_SECTION_NAME) == 0)
{
return &bfd_abs_section;
}
if (strcmp(name, BFD_COM_SECTION_NAME) == 0)
{
return &bfd_com_section;
}
if (strcmp(name, BFD_UND_SECTION_NAME) == 0)
{
return &bfd_und_section;
}
while (sect) {
if (!strcmp(sect->name, name)) return NULL;
prev = §->next;
sect = sect->next;
}
newsect = (asection *) bfd_zalloc(abfd, sizeof (asection));
if (newsect == NULL) {
bfd_error = no_memory;
return NULL;
}
newsect->name = name;
newsect->index = abfd->section_count++;
newsect->flags = SEC_NO_FLAGS;
newsect->userdata = 0;
newsect->next = (asection *)NULL;
newsect->relocation = (arelent *)NULL;
newsect->reloc_count = 0;
newsect->line_filepos =0;
newsect->owner = abfd;
/* Create a symbol whos only job is to point to this section. This is
useful for things like relocs which are relative to the base of a
section. */
newsect->symbol = bfd_make_empty_symbol(abfd);
newsect->symbol->name = name;
newsect->symbol->value = 0;
newsect->symbol->section = newsect;
newsect->symbol->flags = BSF_SECTION_SYM;
newsect->symbol_ptr_ptr = &newsect->symbol;
if (BFD_SEND (abfd, _new_section_hook, (abfd, newsect)) != true) {
free (newsect);
return NULL;
}
*prev = newsect;
return newsect;
}
/*
FUNCTION
bfd_set_section_flags
SYNOPSIS
boolean bfd_set_section_flags(bfd *, asection *, flagword);
DESCRIPTION
Attempts to set the attributes of the section named in the BFD
supplied to the value. Returns true on success, false on
error. Possible error returns are:
o invalid operation -
The section cannot have one or more of the attributes
requested. For example, a .bss section in <<a.out>> may not
have the <<SEC_HAS_CONTENTS>> field set.
*/
boolean
DEFUN(bfd_set_section_flags,(abfd, section, flags),
bfd *abfd AND
sec_ptr section AND
flagword flags)
{
#if 0
/* If you try to copy a text section from an input file (where it
has the SEC_CODE flag set) to an output file, this loses big if
the bfd_applicable_section_flags (abfd) doesn't have the SEC_CODE
set - which it doesn't, at least not for a.out. FIXME */
if ((flags & bfd_applicable_section_flags (abfd)) != flags) {
bfd_error = invalid_operation;
return false;
}
#endif
section->flags = flags;
return true;
}
/*
FUNCTION
bfd_map_over_sections
SYNOPSIS
void bfd_map_over_sections(bfd *abfd,
void (*func)(bfd *abfd,
asection *sect,
PTR obj),
PTR obj);
DESCRIPTION
Calls the provided function @var{func} for each section
attached to the BFD @var{abfd}, passing @var{obj} as an
argument. The function will be called as if by
| func(abfd, the_section, obj);
This is the prefered method for iterating over sections, an
alternative would be to use a loop:
| section *p;
| for (p = abfd->sections; p != NULL; p = p->next)
| func(abfd, p, ...)
*/
/*VARARGS2*/
void
DEFUN(bfd_map_over_sections,(abfd, operation, user_storage),
bfd *abfd AND
void (*operation) PARAMS ((bfd *abfd, asection *sect, PTR obj)) AND
PTR user_storage)
{
asection *sect;
int i = 0;
for (sect = abfd->sections; sect != NULL; i++, sect = sect->next)
(*operation) (abfd, sect, user_storage);
if (i != abfd->section_count) /* Debugging */
abort();
}
/*
FUNCTION
bfd_set_section_size
SYNOPSIS
boolean bfd_set_section_size(bfd *, asection *, bfd_size_type val);
DESCRIPTION
Sets @var{section} to the size @var{val}. If the operation is
ok, then <<true>> is returned, else <<false>>.
Possible error returns:
o invalid_operation -
Writing has started to the BFD, so setting the size is invalid
*/
boolean
DEFUN(bfd_set_section_size,(abfd, ptr, val),
bfd *abfd AND
sec_ptr ptr AND
bfd_size_type val)
{
/* Once you've started writing to any section you cannot create or change
the size of any others. */
if (abfd->output_has_begun) {
bfd_error = invalid_operation;
return false;
}
ptr->_cooked_size = val;
ptr->_raw_size = val;
return true;
}
/*
FUNCTION
bfd_set_section_contents
SYNOPSIS
boolean bfd_set_section_contents
(bfd *abfd,
asection *section,
PTR data,
file_ptr offset,
bfd_size_type count);
DESCRIPTION
Sets the contents of the section @var{section} in BFD
@var{abfd} to the data starting in memory at @var{data}. The
data is written to the output section starting at offset
@var{offset} for @var{count} bytes.
Normally <<true>> is returned, else <<false>>. Possible error
returns are:
o no_contents -
The output section does not have the <<SEC_HAS_CONTENTS>>
attribute, so nothing can be written to it.
o and some more too
This routine is front end to the back end function
<<_bfd_set_section_contents>>.
*/
#define bfd_get_section_size_now(abfd,sec) \
(sec->reloc_done \
? bfd_get_section_size_after_reloc (sec) \
: bfd_get_section_size_before_reloc (sec))
boolean
DEFUN(bfd_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)
{
bfd_size_type sz;
if (!(bfd_get_section_flags(abfd, section) & SEC_HAS_CONTENTS))
{
bfd_error = no_contents;
return(false);
}
if (offset < 0 || count < 0)
{
bad_val:
bfd_error = bad_value;
return false;
}
sz = bfd_get_section_size_now (abfd, section);
if (offset > sz
|| count > sz
|| offset + count > sz)
goto bad_val;
if (BFD_SEND (abfd, _bfd_set_section_contents,
(abfd, section, location, offset, count)))
{
abfd->output_has_begun = true;
return true;
}
return false;
}
/*
FUNCTION
bfd_get_section_contents
SYNOPSIS
boolean bfd_get_section_contents
(bfd *abfd, asection *section, PTR location,
file_ptr offset, bfd_size_type count);
DESCRIPTION
This function reads data from @var{section} in BFD @var{abfd}
into memory starting at @var{location}. The data is read at an
offset of @var{offset} from the start of the input section,
and is read for @var{count} bytes.
If the contents of a constuctor with the <<SEC_CONSTUCTOR>>
flag set are requested, then the @var{location} is filled with
zeroes. If no errors occur, <<true>> is returned, else
<<false>>.
*/
boolean
DEFUN(bfd_get_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)
{
bfd_size_type sz;
if (section->flags & SEC_CONSTRUCTOR)
{
memset(location, 0, (unsigned)count);
return true;
}
if (offset < 0 || count < 0)
{
bad_val:
bfd_error = bad_value;
return false;
}
sz = bfd_get_section_size_now (abfd, section);
if (offset > sz
|| count > sz
|| offset + count > sz)
goto bad_val;
if (count == 0)
/* Don't bother. */
return true;
return BFD_SEND (abfd, _bfd_get_section_contents,
(abfd, section, location, offset, count));
}
|