/* Support for the generic parts of most COFF variants, for BFD.

Copyright (C) 1990-2016 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 3 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,

MA 02110-1301, USA. */

/* Most of this hacked by Steve Chamberlain,

sac@cygnus.com. */

/*

SECTION

coff backends

BFD supports a number of different flavours of coff format.

The major differences between formats are the sizes and

alignments of fields in structures on disk, and the occasional

extra field.

Coff in all its varieties is implemented with a few common

files and a number of implementation specific files. For

example, The 88k bcs coff format is implemented in the file

@file{coff-m88k.c}. This file @code{#include}s

@file{coff/m88k.h} which defines the external structure of the

coff format for the 88k, and @file{coff/internal.h} which

defines the internal structure. @file{coff-m88k.c} also

defines the relocations used by the 88k format

@xref{Relocations}.

The Intel i960 processor version of coff is implemented in

@file{coff-i960.c}. This file has the same structure as

@file{coff-m88k.c}, except that it includes @file{coff/i960.h}

rather than @file{coff-m88k.h}.

SUBSECTION

Porting to a new version of coff

The recommended method is to select from the existing

implementations the version of coff which is most like the one

you want to use. For example, we'll say that i386 coff is

the one you select, and that your coff flavour is called foo.

Copy @file{i386coff.c} to @file{foocoff.c}, copy

@file{../include/coff/i386.h} to @file{../include/coff/foo.h},

and add the lines to @file{targets.c} and @file{Makefile.in}

so that your new back end is used. Alter the shapes of the

structures in @file{../include/coff/foo.h} so that they match

what you need. You will probably also have to add

@code{#ifdef}s to the code in @file{coff/internal.h} and

@file{coffcode.h} if your version of coff is too wild.

You can verify that your new BFD backend works quite simply by

building @file{objdump} from the @file{binutils} directory,

and making sure that its version of what's going on and your

host system's idea (assuming it has the pretty standard coff

dump utility, usually called @code{att-dump} or just

@code{dump}) are the same. Then clean up your code, and send

what you've done to Cygnus. Then your stuff will be in the

next release, and you won't have to keep integrating it.

SUBSECTION

How the coff backend works

SUBSUBSECTION

File layout

The Coff backend is split into generic routines that are

applicable to any Coff target and routines that are specific

to a particular target. The target-specific routines are

further split into ones which are basically the same for all

Coff targets except that they use the external symbol format

or use different values for certain constants.

The generic routines are in @file{coffgen.c}. These routines

work for any Coff target. They use some hooks into the target

specific code; the hooks are in a @code{bfd_coff_backend_data}

structure, one of which exists for each target.

The essentially similar target-specific routines are in

@file{coffcode.h}. This header file includes executable C code.

The various Coff targets first include the appropriate Coff

header file, make any special defines that are needed, and

then include @file{coffcode.h}.

Some of the Coff targets then also have additional routines in

the target source file itself.

For example, @file{coff-i960.c} includes

@file{coff/internal.h} and @file{coff/i960.h}. It then

defines a few constants, such as @code{I960}, and includes

@file{coffcode.h}. Since the i960 has complex relocation

types, @file{coff-i960.c} also includes some code to

manipulate the i960 relocs. This code is not in

@file{coffcode.h} because it would not be used by any other

target.

SUBSUBSECTION

Coff long section names

In the standard Coff object format, section names are limited to

the eight bytes available in the @code{s_name} field of the

@code{SCNHDR} section header structure. The format requires the

field to be NUL-padded, but not necessarily NUL-terminated, so

the longest section names permitted are a full eight characters.

The Microsoft PE variants of the Coff object file format add

an extension to support the use of long section names. This

extension is defined in section 4 of the Microsoft PE/COFF

specification (rev 8.1). If a section name is too long to fit

into the section header's @code{s_name} field, it is instead

placed into the string table, and the @code{s_name} field is

filled with a slash ("/") followed by the ASCII decimal

representation of the offset of the full name relative to the

string table base.

Note that this implies that the extension can only be used in object

files, as executables do not contain a string table. The standard

specifies that long section names from objects emitted into executable

images are to be truncated.

However, as a GNU extension, BFD can generate executable images

that contain a string table and long section names. This

would appear to be technically valid, as the standard only says

that Coff debugging information is deprecated, not forbidden,

and in practice it works, although some tools that parse PE files

expecting the MS standard format may become confused; @file{PEview} is

one known example.

The functionality is supported in BFD by code implemented under

the control of the macro @code{COFF_LONG_SECTION_NAMES}. If not

defined, the format does not support long section names in any way.

If defined, it is used to initialise a flag,

@code{_bfd_coff_long_section_names}, and a hook function pointer,

@code{_bfd_coff_set_long_section_names}, in the Coff backend data

structure. The flag controls the generation of long section names

in output BFDs at runtime; if it is false, as it will be by default

when generating an executable image, long section names are truncated;

if true, the long section names extension is employed. The hook

points to a function that allows the value of the flag to be altered

at runtime, on formats that support long section names at all; on

other formats it points to a stub that returns an error indication.

With input BFDs, the flag is set according to whether any long section

names are detected while reading the section headers. For a completely

new BFD, the flag is set to the default for the target format. This

information can be used by a client of the BFD library when deciding

what output format to generate, and means that a BFD that is opened

for read and subsequently converted to a writeable BFD and modified

in-place will retain whatever format it had on input.

If @code{COFF_LONG_SECTION_NAMES} is simply defined (blank), or is

defined to the value "1", then long section names are enabled by

default; if it is defined to the value zero, they are disabled by

default (but still accepted in input BFDs). The header @file{coffcode.h}

defines a macro, @code{COFF_DEFAULT_LONG_SECTION_NAMES}, which is

used in the backends to initialise the backend data structure fields

appropriately; see the comments for further detail.

SUBSUBSECTION

Bit twiddling

Each flavour of coff supported in BFD has its own header file

describing the external layout of the structures. There is also

an internal description of the coff layout, in

@file{coff/internal.h}. A major function of the

coff backend is swapping the bytes and twiddling the bits to

translate the external form of the structures into the normal

internal form. This is all performed in the

@code{bfd_swap}_@i{thing}_@i{direction} routines. Some

elements are different sizes between different versions of

coff; it is the duty of the coff version specific include file

to override the definitions of various packing routines in

@file{coffcode.h}. E.g., the size of line number entry in coff is

sometimes 16 bits, and sometimes 32 bits. @code{#define}ing

@code{PUT_LNSZ_LNNO} and @code{GET_LNSZ_LNNO} will select the

correct one. No doubt, some day someone will find a version of

coff which has a varying field size not catered to at the

moment. To port BFD, that person will have to add more @code{#defines}.

Three of the bit twiddling routines are exported to

@code{gdb}; @code{coff_swap_aux_in}, @code{coff_swap_sym_in}

and @code{coff_swap_lineno_in}. @code{GDB} reads the symbol

table on its own, but uses BFD to fix things up. More of the

bit twiddlers are exported for @code{gas};

@code{coff_swap_aux_out}, @code{coff_swap_sym_out},

@code{coff_swap_lineno_out}, @code{coff_swap_reloc_out},

@code{coff_swap_filehdr_out}, @code{coff_swap_aouthdr_out},

@code{coff_swap_scnhdr_out}. @code{Gas} currently keeps track

of all the symbol table and reloc drudgery itself, thereby

saving the internal BFD overhead, but uses BFD to swap things

on the way out, making cross ports much safer. Doing so also

allows BFD (and thus the linker) to use the same header files

as @code{gas}, which makes one avenue to disaster disappear.

SUBSUBSECTION

Symbol reading

The simple canonical form for symbols used by BFD is not rich

enough to keep all the information available in a coff symbol

table. The back end gets around this problem by keeping the original

symbol table around, "behind the scenes".

When a symbol table is requested (through a call to

@code{bfd_canonicalize_symtab}), a request gets through to

@code{coff_get_normalized_symtab}. This reads the symbol table from

the coff file and swaps all the structures inside into the

internal form. It also fixes up all the pointers in the table

(represented in the file by offsets from the first symbol in

the table) into physical pointers to elements in the new

internal table. This involves some work since the meanings of

fields change depending upon context: a field that is a

pointer to another structure in the symbol table at one moment

may be the size in bytes of a structure at the next. Another

pass is made over the table. All symbols which mark file names

(<<C_FILE>> symbols) are modified so that the internal

string points to the value in the auxent (the real filename)

rather than the normal text associated with the symbol

(@code{".file"}).

At this time the symbol names are moved around. Coff stores

all symbols less than nine characters long physically

within the symbol table; longer strings are kept at the end of

the file in the string table. This pass moves all strings

into memory and replaces them with pointers to the strings.

The symbol table is massaged once again, this time to create

the canonical table used by the BFD application. Each symbol

is inspected in turn, and a decision made (using the

@code{sclass} field) about the various flags to set in the

@code{asymbol}. @xref{Symbols}. The generated canonical table

shares strings with the hidden internal symbol table.

Any linenumbers are read from the coff file too, and attached

to the symbols which own the functions the linenumbers belong to.

SUBSUBSECTION

Symbol writing

Writing a symbol to a coff file which didn't come from a coff

file will lose any debugging information. The @code{asymbol}

structure remembers the BFD from which the symbol was taken, and on

output the back end makes sure that the same destination target as

source target is present.

When the symbols have come from a coff file then all the

debugging information is preserved.

Symbol tables are provided for writing to the back end in a

vector of pointers to pointers. This allows applications like

the linker to accumulate and output large symbol tables

without having to do too much byte copying.

This function runs through the provided symbol table and

patches each symbol marked as a file place holder

(@code{C_FILE}) to point to the next file place holder in the

list. It also marks each @code{offset} field in the list with

the offset from the first symbol of the current symbol.

Another function of this procedure is to turn the canonical

value form of BFD into the form used by coff. Internally, BFD

expects symbol values to be offsets from a section base; so a

symbol physically at 0x120, but in a section starting at

0x100, would have the value 0x20. Coff expects symbols to

contain their final value, so symbols have their values

changed at this point to reflect their sum with their owning

section. This transformation uses the

<<output_section>> field of the @code{asymbol}'s

@code{asection} @xref{Sections}.

o <<coff_mangle_symbols>>

This routine runs though the provided symbol table and uses

the offsets generated by the previous pass and the pointers

generated when the symbol table was read in to create the

structured hierarchy required by coff. It changes each pointer

to a symbol into the index into the symbol table of the asymbol.

o <<coff_write_symbols>>

This routine runs through the symbol table and patches up the

symbols from their internal form into the coff way, calls the

bit twiddlers, and writes out the table to the file.

*/

/*

INTERNAL_DEFINITION

coff_symbol_type

DESCRIPTION

The hidden information for an <<asymbol>> is described in a

<<combined_entry_type>>:

CODE_FRAGMENT

.

.typedef struct coff_ptr_struct

.{

. {* Remembers the offset from the first symbol in the file for

. this symbol. Generated by coff_renumber_symbols. *}

. unsigned int offset;

.

. {* Should the value of this symbol be renumbered. Used for

. XCOFF C_BSTAT symbols. Set by coff_slurp_symbol_table. *}

. unsigned int fix_value : 1;

.

. {* Should the tag field of this symbol be renumbered.

. Created by coff_pointerize_aux. *}

. unsigned int fix_tag : 1;

.

. {* Should the endidx field of this symbol be renumbered.

. Created by coff_pointerize_aux. *}

. unsigned int fix_end : 1;

.

. {* Should the x_csect.x_scnlen field be renumbered.

. Created by coff_pointerize_aux. *}

. unsigned int fix_scnlen : 1;

.

. {* Fix up an XCOFF C_BINCL/C_EINCL symbol. The value is the

. index into the line number entries. Set by coff_slurp_symbol_table. *}

. unsigned int fix_line : 1;

.

. {* The container for the symbol structure as read and translated

. from the file. *}

. union

. {

. union internal_auxent auxent;

. struct internal_syment syment;

. } u;

.

. {* Selector for the union above. *}

. bfd_boolean is_sym;

.} combined_entry_type;

.

.

.{* Each canonical asymbol really looks like this: *}

.

.typedef struct coff_symbol_struct

.{

. {* The actual symbol which the rest of BFD works with *}

. asymbol symbol;

.

. {* A pointer to the hidden information for this symbol *}

. combined_entry_type *native;

.

. {* A pointer to the linenumber information for this symbol *}

. struct lineno_cache_entry *lineno;

.

. {* Have the line numbers been relocated yet ? *}

. bfd_boolean done_lineno;

.} coff_symbol_type;

*/

#include "libiberty.h"

#ifdef COFF_WITH_PE

#include "peicode.h"

#else

#include "coffswap.h"

#endif

#define STRING_SIZE_SIZE 4

#define DOT_DEBUG ".debug"

#define DOT_ZDEBUG ".zdebug"

#define GNU_LINKONCE_WI ".gnu.linkonce.wi."

#define GNU_LINKONCE_WT ".gnu.linkonce.wt."

#define DOT_RELOC ".reloc"

#if defined (COFF_LONG_SECTION_NAMES)

/* Needed to expand the inputs to BLANKOR1TOODD. */

#define COFFLONGSECTIONCATHELPER(x,y) x ## y

/* If the input macro Y is blank or '1', return an odd number; if it is

'0', return an even number. Result undefined in all other cases. */

#define BLANKOR1TOODD(y) COFFLONGSECTIONCATHELPER(1,y)

/* Defined to numerical 0 or 1 according to whether generation of long

section names is disabled or enabled by default. */

#define COFF_ENABLE_LONG_SECTION_NAMES (BLANKOR1TOODD(COFF_LONG_SECTION_NAMES) & 1)

/* Where long section names are supported, we allow them to be enabled

and disabled at runtime, so select an appropriate hook function for

_bfd_coff_set_long_section_names. */

#define COFF_LONG_SECTION_NAMES_SETTER bfd_coff_set_long_section_names_allowed

#else /* !defined (COFF_LONG_SECTION_NAMES) */

/* If long section names are not supported, this stub disallows any

attempt to enable them at run-time. */

#define COFF_LONG_SECTION_NAMES_SETTER bfd_coff_set_long_section_names_disallowed

#endif /* defined (COFF_LONG_SECTION_NAMES) */

/* Define a macro that can be used to initialise both the fields relating

to long section names in the backend data struct simultaneously. */

#if COFF_ENABLE_LONG_SECTION_NAMES

#define COFF_DEFAULT_LONG_SECTION_NAMES (TRUE), COFF_LONG_SECTION_NAMES_SETTER

#else /* !COFF_ENABLE_LONG_SECTION_NAMES */

#define COFF_DEFAULT_LONG_SECTION_NAMES (FALSE), COFF_LONG_SECTION_NAMES_SETTER

#endif /* COFF_ENABLE_LONG_SECTION_NAMES */

#if defined (COFF_LONG_SECTION_NAMES)

static bfd_boolean bfd_coff_set_long_section_names_allowed

(bfd *, int);

#else /* !defined (COFF_LONG_SECTION_NAMES) */

static bfd_boolean bfd_coff_set_long_section_names_disallowed

(bfd *, int);

#endif /* defined (COFF_LONG_SECTION_NAMES) */

static long sec_to_styp_flags

(const char *, flagword);

static bfd_boolean styp_to_sec_flags

(bfd *, void *, const char *, asection *, flagword *);

static bfd_boolean coff_bad_format_hook

(bfd *, void *);

static void coff_set_custom_section_alignment

(bfd *, asection *, const struct coff_section_alignment_entry *,

const unsigned int);

static bfd_boolean coff_new_section_hook

(bfd *, asection *);

static bfd_boolean coff_set_arch_mach_hook

(bfd *, void *);

static bfd_boolean coff_write_relocs

(bfd *, int);

static bfd_boolean coff_set_flags

(bfd *, unsigned int *, unsigned short *);

static bfd_boolean coff_set_arch_mach

(bfd *, enum bfd_architecture, unsigned long) ATTRIBUTE_UNUSED;

static bfd_boolean coff_compute_section_file_positions

(bfd *);

static bfd_boolean coff_write_object_contents

(bfd *) ATTRIBUTE_UNUSED;

static bfd_boolean coff_set_section_contents

(bfd *, asection *, const void *, file_ptr, bfd_size_type);

static void * buy_and_read

(bfd *, file_ptr, bfd_size_type);

static bfd_boolean coff_slurp_line_table

(bfd *, asection *);

static bfd_boolean coff_slurp_symbol_table

(bfd *);

static enum coff_symbol_classification coff_classify_symbol

(bfd *, struct internal_syment *);

static bfd_boolean coff_slurp_reloc_table

(bfd *, asection *, asymbol **);

static long coff_canonicalize_reloc

(bfd *, asection *, arelent **, asymbol **);

#ifndef coff_mkobject_hook

static void * coff_mkobject_hook

(bfd *, void *, void *);

#endif

#ifdef COFF_WITH_PE

static flagword handle_COMDAT

(bfd *, flagword, void *, const char *, asection *);

#endif

#ifdef COFF_IMAGE_WITH_PE

static bfd_boolean coff_read_word

(bfd *, unsigned int *);

static unsigned int coff_compute_checksum

(bfd *);

static bfd_boolean coff_apply_checksum

(bfd *);

#endif

#ifdef TICOFF

static bfd_boolean ticoff0_bad_format_hook

(bfd *, void * );

static bfd_boolean ticoff1_bad_format_hook

(bfd *, void * );

#endif



/* void warning(); */

#if defined (COFF_LONG_SECTION_NAMES)

static bfd_boolean

bfd_coff_set_long_section_names_allowed (bfd *abfd, int enable)

{

coff_backend_info (abfd)->_bfd_coff_long_section_names = enable;

return TRUE;

}

#else /* !defined (COFF_LONG_SECTION_NAMES) */

static bfd_boolean

bfd_coff_set_long_section_names_disallowed (bfd *abfd, int enable)

{

(void) abfd;

(void) enable;

return FALSE;

}

#endif /* defined (COFF_LONG_SECTION_NAMES) */

/* Return a word with STYP_* (scnhdr.s_flags) flags set to represent

the incoming SEC_* flags. The inverse of this function is

styp_to_sec_flags(). NOTE: If you add to/change this routine, you

should probably mirror the changes in styp_to_sec_flags(). */

#ifndef COFF_WITH_PE

/* Macros for setting debugging flags. */

#ifdef STYP_DEBUG

#define STYP_XCOFF_DEBUG STYP_DEBUG

#else

#define STYP_XCOFF_DEBUG STYP_INFO

#endif

#ifdef COFF_ALIGN_IN_S_FLAGS

#define STYP_DEBUG_INFO STYP_DSECT

#else

#define STYP_DEBUG_INFO STYP_INFO

#endif

static long

sec_to_styp_flags (const char *sec_name, flagword sec_flags)

{

long styp_flags = 0;

if (!strcmp (sec_name, _TEXT))

{

styp_flags = STYP_TEXT;

}

else if (!strcmp (sec_name, _DATA))

{

styp_flags = STYP_DATA;

}

else if (!strcmp (sec_name, _BSS))

{

styp_flags = STYP_BSS;

#ifdef _COMMENT

}

else if (!strcmp (sec_name, _COMMENT))

{

styp_flags = STYP_INFO;

#endif /* _COMMENT */

#ifdef _LIB

}

else if (!strcmp (sec_name, _LIB))

{

styp_flags = STYP_LIB;

#endif /* _LIB */

#ifdef _LIT

}

else if (!strcmp (sec_name, _LIT))

{

styp_flags = STYP_LIT;

#endif /* _LIT */

}

else if (CONST_STRNEQ (sec_name, DOT_DEBUG)

|| CONST_STRNEQ (sec_name, DOT_ZDEBUG))

{

/* Handle the XCOFF debug section and DWARF2 debug sections. */

if (!sec_name[6])

styp_flags = STYP_XCOFF_DEBUG;

else

styp_flags = STYP_DEBUG_INFO;

}

else if (CONST_STRNEQ (sec_name, ".stab"))

{

styp_flags = STYP_DEBUG_INFO;

}

#ifdef COFF_LONG_SECTION_NAMES

else if (CONST_STRNEQ (sec_name, GNU_LINKONCE_WI)

|| CONST_STRNEQ (sec_name, GNU_LINKONCE_WT))

{

styp_flags = STYP_DEBUG_INFO;

}

#endif

#ifdef RS6000COFF_C

else if (!strcmp (sec_name, _PAD))

{

styp_flags = STYP_PAD;

}

else if (!strcmp (sec_name, _LOADER))

{

styp_flags = STYP_LOADER;

}

else if (!strcmp (sec_name, _EXCEPT))

{

styp_flags = STYP_EXCEPT;

}

else if (!strcmp (sec_name, _TYPCHK))

{

styp_flags = STYP_TYPCHK;

}

else if (sec_flags & SEC_DEBUGGING)

{

int i;

for (i = 0; i < XCOFF_DWSECT_NBR_NAMES; i++)

if (!strcmp (sec_name, xcoff_dwsect_names[i].name))

{

styp_flags = STYP_DWARF | xcoff_dwsect_names[i].flag;

break;

}

}

#endif

/* Try and figure out what it should be */

else if (sec_flags & SEC_CODE)

{

styp_flags = STYP_TEXT;

}

else if (sec_flags & SEC_DATA)

{

styp_flags = STYP_DATA;

}

else if (sec_flags & SEC_READONLY)

{

#ifdef STYP_LIT /* 29k readonly text/data section */

styp_flags = STYP_LIT;

#else

styp_flags = STYP_TEXT;

#endif /* STYP_LIT */

}

else if (sec_flags & SEC_LOAD)

{

styp_flags = STYP_TEXT;

}

else if (sec_flags & SEC_ALLOC)

{

styp_flags = STYP_BSS;

}

#ifdef STYP_CLINK

if (sec_flags & SEC_TIC54X_CLINK)

styp_flags |= STYP_CLINK;

#endif

#ifdef STYP_BLOCK

if (sec_flags & SEC_TIC54X_BLOCK)

styp_flags |= STYP_BLOCK;

#endif

#ifdef STYP_NOLOAD

if ((sec_flags & (SEC_NEVER_LOAD | SEC_COFF_SHARED_LIBRARY)) != 0)

styp_flags |= STYP_NOLOAD;

#endif

return styp_flags;

}

#else /* COFF_WITH_PE */

/* The PE version; see above for the general comments. The non-PE

case seems to be more guessing, and breaks PE format; specifically,

.rdata is readonly, but it sure ain't text. Really, all this

should be set up properly in gas (or whatever assembler is in use),

and honor whatever objcopy/strip, etc. sent us as input. */

static long

sec_to_styp_flags (const char *sec_name, flagword sec_flags)

{

long styp_flags = 0;

bfd_boolean is_dbg = FALSE;

if (CONST_STRNEQ (sec_name, DOT_DEBUG)

|| CONST_STRNEQ (sec_name, DOT_ZDEBUG)

#ifdef COFF_LONG_SECTION_NAMES

|| CONST_STRNEQ (sec_name, GNU_LINKONCE_WI)

|| CONST_STRNEQ (sec_name, GNU_LINKONCE_WT)

#endif

|| CONST_STRNEQ (sec_name, ".stab"))

is_dbg = TRUE;

/* caution: there are at least three groups of symbols that have

very similar bits and meanings: IMAGE_SCN*, SEC_*, and STYP_*.

SEC_* are the BFD internal flags, used for generic BFD

information. STYP_* are the COFF section flags which appear in

COFF files. IMAGE_SCN_* are the PE section flags which appear in

PE files. The STYP_* flags and the IMAGE_SCN_* flags overlap,

but there are more IMAGE_SCN_* flags. */

/* FIXME: There is no gas syntax to specify the debug section flag. */

if (is_dbg)

{

sec_flags &= (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD

| SEC_LINK_DUPLICATES_SAME_CONTENTS

| SEC_LINK_DUPLICATES_SAME_SIZE);

sec_flags |= SEC_DEBUGGING | SEC_READONLY;

}

/* skip LOAD */

/* READONLY later */

/* skip RELOC */

if ((sec_flags & SEC_CODE) != 0)

styp_flags |= IMAGE_SCN_CNT_CODE;

if ((sec_flags & (SEC_DATA | SEC_DEBUGGING)) != 0)

styp_flags |= IMAGE_SCN_CNT_INITIALIZED_DATA;

if ((sec_flags & SEC_ALLOC) != 0 && (sec_flags & SEC_LOAD) == 0)

styp_flags |= IMAGE_SCN_CNT_UNINITIALIZED_DATA; /* ==STYP_BSS */

/* skip ROM */

/* skip constRUCTOR */

/* skip CONTENTS */

if ((sec_flags & SEC_IS_COMMON) != 0)

styp_flags |= IMAGE_SCN_LNK_COMDAT;

if ((sec_flags & SEC_DEBUGGING) != 0)

styp_flags |= IMAGE_SCN_MEM_DISCARDABLE;

if ((sec_flags & SEC_EXCLUDE) != 0 && !is_dbg)

styp_flags |= IMAGE_SCN_LNK_REMOVE;

if ((sec_flags & SEC_NEVER_LOAD) != 0 && !is_dbg)

styp_flags |= IMAGE_SCN_LNK_REMOVE;

/* skip IN_MEMORY */

/* skip SORT */

if (sec_flags & SEC_LINK_ONCE)

styp_flags |= IMAGE_SCN_LNK_COMDAT;

if ((sec_flags

& (SEC_LINK_DUPLICATES_DISCARD | SEC_LINK_DUPLICATES_SAME_CONTENTS

| SEC_LINK_DUPLICATES_SAME_SIZE)) != 0)

styp_flags |= IMAGE_SCN_LNK_COMDAT;

/* skip LINKER_CREATED */

if ((sec_flags & SEC_COFF_NOREAD) == 0)

styp_flags |= IMAGE_SCN_MEM_READ; /* Invert NOREAD for read. */

if ((sec_flags & SEC_READONLY) == 0)

styp_flags |= IMAGE_SCN_MEM_WRITE; /* Invert READONLY for write. */

if (sec_flags & SEC_CODE)

styp_flags |= IMAGE_SCN_MEM_EXECUTE; /* CODE->EXECUTE. */

if (sec_flags & SEC_COFF_SHARED)

styp_flags |= IMAGE_SCN_MEM_SHARED; /* Shared remains meaningful. */

return styp_flags;

}

#endif /* COFF_WITH_PE */

/* Return a word with SEC_* flags set to represent the incoming STYP_*

flags (from scnhdr.s_flags). The inverse of this function is

sec_to_styp_flags(). NOTE: If you add to/change this routine, you

should probably mirror the changes in sec_to_styp_flags(). */

#ifndef COFF_WITH_PE

static bfd_boolean

styp_to_sec_flags (bfd *abfd ATTRIBUTE_UNUSED,

flagword *flags_ptr)

{

struct internal_scnhdr *internal_s = (struct internal_scnhdr *) hdr;

long styp_flags = internal_s->s_flags;

flagword sec_flags = 0;

#ifdef STYP_BLOCK

if (styp_flags & STYP_BLOCK)

sec_flags |= SEC_TIC54X_BLOCK;

#endif

#ifdef STYP_CLINK

if (styp_flags & STYP_CLINK)

sec_flags |= SEC_TIC54X_CLINK;

#endif

#ifdef STYP_NOLOAD

if (styp_flags & STYP_NOLOAD)

sec_flags |= SEC_NEVER_LOAD;

#endif /* STYP_NOLOAD */

/* For 386 COFF, at least, an unloadable text or data section is

actually a shared library section. */

if (styp_flags & STYP_TEXT)

{

if (sec_flags & SEC_NEVER_LOAD)

sec_flags |= SEC_CODE | SEC_COFF_SHARED_LIBRARY;

else

sec_flags |= SEC_CODE | SEC_LOAD | SEC_ALLOC;

}

else if (styp_flags & STYP_DATA)

{

if (sec_flags & SEC_NEVER_LOAD)

sec_flags |= SEC_DATA | SEC_COFF_SHARED_LIBRARY;

else

sec_flags |= SEC_DATA | SEC_LOAD | SEC_ALLOC;

}

else if (styp_flags & STYP_BSS)

{

#ifdef BSS_NOLOAD_IS_SHARED_LIBRARY

if (sec_flags & SEC_NEVER_LOAD)

sec_flags |= SEC_ALLOC | SEC_COFF_SHARED_LIBRARY;

else

#endif

sec_flags |= SEC_ALLOC;

}

else if (styp_flags & STYP_INFO)

{

/* We mark these as SEC_DEBUGGING, but only if COFF_PAGE_SIZE is

defined. coff_compute_section_file_positions uses

COFF_PAGE_SIZE to ensure that the low order bits of the

section VMA and the file offset match. If we don't know

COFF_PAGE_SIZE, we can't ensure the correct correspondence,

and demand page loading of the file will fail. */

#if defined (COFF_PAGE_SIZE) && !defined (COFF_ALIGN_IN_S_FLAGS)

sec_flags |= SEC_DEBUGGING;

#endif

}

else if (styp_flags & STYP_PAD)

sec_flags = 0;

#ifdef RS6000COFF_C

else if (styp_flags & STYP_EXCEPT)

sec_flags |= SEC_LOAD;

else if (styp_flags & STYP_LOADER)

sec_flags |= SEC_LOAD;

else if (styp_flags & STYP_TYPCHK)

sec_flags |= SEC_LOAD;

else if (styp_flags & STYP_DWARF)

sec_flags |= SEC_DEBUGGING;

#endif

else if (strcmp (name, _TEXT) == 0)

{

if (sec_flags & SEC_NEVER_LOAD)

sec_flags |= SEC_CODE | SEC_COFF_SHARED_LIBRARY;

else

sec_flags |= SEC_CODE | SEC_LOAD | SEC_ALLOC;

}

else if (strcmp (name, _DATA) == 0)

{

if (sec_flags & SEC_NEVER_LOAD)

sec_flags |= SEC_DATA | SEC_COFF_SHARED_LIBRARY;

else

sec_flags |= SEC_DATA | SEC_LOAD | SEC_ALLOC;

}

else if (strcmp (name, _BSS) == 0)

{

#ifdef BSS_NOLOAD_IS_SHARED_LIBRARY

if (sec_flags & SEC_NEVER_LOAD)

sec_flags |= SEC_ALLOC | SEC_COFF_SHARED_LIBRARY;

else

#endif

sec_flags |= SEC_ALLOC;

}

else if (CONST_STRNEQ (name, DOT_DEBUG)

|| CONST_STRNEQ (name, ".stab"))

{

#ifdef COFF_PAGE_SIZE

sec_flags |= SEC_DEBUGGING;

#endif

}

#ifdef _LIB

else if (strcmp (name, _LIB) == 0)

;

#endif

#ifdef _LIT

else if (strcmp (name, _LIT) == 0)

sec_flags = SEC_LOAD | SEC_ALLOC | SEC_READONLY;

#endif

else

sec_flags |= SEC_ALLOC | SEC_LOAD;

#ifdef STYP_LIT /* A29k readonly text/data section type. */

if ((styp_flags & STYP_LIT) == STYP_LIT)

sec_flags = (SEC_LOAD | SEC_ALLOC | SEC_READONLY);

#endif /* STYP_LIT */

#ifdef STYP_OTHER_LOAD /* Other loaded sections. */

if (styp_flags & STYP_OTHER_LOAD)

sec_flags = (SEC_LOAD | SEC_ALLOC);

#endif /* STYP_SDATA */

#if defined (COFF_LONG_SECTION_NAMES) && defined (COFF_SUPPORT_GNU_LINKONCE)

/* As a GNU extension, if the name begins with .gnu.linkonce, we

only link a single copy of the section. This is used to support

g++. g++ will emit each template expansion in its own section.

The symbols will be defined as weak, so that multiple definitions

are permitted. The GNU linker extension is to actually discard

all but one of the sections. */

if (CONST_STRNEQ (name, ".gnu.linkonce"))

sec_flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD;

#endif

if (flags_ptr == NULL)

return FALSE;

* flags_ptr = sec_flags;

return TRUE;

}

#else /* COFF_WITH_PE */

static flagword

handle_COMDAT (bfd * abfd,

asection *section)

{

struct internal_scnhdr *internal_s = (struct internal_scnhdr *) hdr;

bfd_byte *esymstart, *esym, *esymend;

int seen_state = 0;

char *target_name = NULL;

sec_flags |= SEC_LINK_ONCE;

/* Unfortunately, the PE format stores essential information in

the symbol table, of all places. We need to extract that

information now, so that objdump and the linker will know how

to handle the section without worrying about the symbols. We

can't call slurp_symtab, because the linker doesn't want the

swapped symbols. */

/* COMDAT sections are special. The first symbol is the section

symbol, which tells what kind of COMDAT section it is. The

second symbol is the "comdat symbol" - the one with the

unique name. GNU uses the section symbol for the unique

name; MS uses ".text" for every comdat section. Sigh. - DJ */

/* This is not mirrored in sec_to_styp_flags(), but there

doesn't seem to be a need to, either, and it would at best be

rather messy. */

if (! _bfd_coff_get_external_symbols (abfd))

return sec_flags;

esymstart = esym = (bfd_byte *) obj_coff_external_syms (abfd);

esymend = esym + obj_raw_syment_count (abfd) * bfd_coff_symesz (abfd);

while (esym < esymend)

{

struct internal_syment isym;

char buf[SYMNMLEN + 1];

const char *symname;

bfd_coff_swap_sym_in (abfd, esym, & isym);

BFD_ASSERT (sizeof (internal_s->s_name) <= SYMNMLEN);

if (isym.n_scnum == section->target_index)

{

/* According to the MSVC documentation, the first

TWO entries with the section # are both of

interest to us. The first one is the "section

symbol" (section name). The second is the comdat

symbol name. Here, we've found the first

qualifying entry; we distinguish it from the

second with a state flag.

In the case of gas-generated (at least until that

is fixed) .o files, it isn't necessarily the

second one. It may be some other later symbol.

Since gas also doesn't follow MS conventions and

emits the section similar to .text$<name>, where

<something> is the name we're looking for, we

distinguish the two as follows:

If the section name is simply a section name (no

$) we presume it's MS-generated, and look at

precisely the second symbol for the comdat name.

If the section name has a $, we assume it's

gas-generated, and look for <something> (whatever

follows the $) as the comdat symbol. */

/* All 3 branches use this. */

symname = _bfd_coff_internal_syment_name (abfd, &isym, buf);

/* PR 17512 file: 078-11867-0.004 */

if (symname == NULL)

{

_bfd_error_handler (_("%B: unable to load COMDAT section name"), abfd);

break;

}

switch (seen_state)

{

case 0:

{

/* The first time we've seen the symbol. */

union internal_auxent aux;

/* If it isn't the stuff we're expecting, die;

The MS documentation is vague, but it

appears that the second entry serves BOTH

as the comdat symbol and the defining

symbol record (either C_STAT or C_EXT,

possibly with an aux entry with debug

information if it's a function.) It

appears the only way to find the second one

is to count. (On Intel, they appear to be

adjacent, but on Alpha, they have been

found separated.)

Here, we think we've found the first one,

but there's some checking we can do to be

sure. */

if (! ((isym.n_sclass == C_STAT

|| isym.n_sclass == C_EXT)

&& BTYPE (isym.n_type) == T_NULL

&& isym.n_value == 0))

abort ();