1 /* Support for the generic parts of most COFF variants, for BFD.
2 Copyright 1990, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
3 Written by Cygnus Support.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
22 Most of this hacked by Steve Chamberlain,
30 BFD supports a number of different flavours of coff format.
31 The major differences between formats are the sizes and
32 alignments of fields in structures on disk, and the occasional
35 Coff in all its varieties is implemented with a few common
36 files and a number of implementation specific files. For
37 example, The 88k bcs coff format is implemented in the file
38 @file{coff-m88k.c}. This file @code{#include}s
39 @file{coff/m88k.h} which defines the external structure of the
40 coff format for the 88k, and @file{coff/internal.h} which
41 defines the internal structure. @file{coff-m88k.c} also
42 defines the relocations used by the 88k format
45 The Intel i960 processor version of coff is implemented in
46 @file{coff-i960.c}. This file has the same structure as
47 @file{coff-m88k.c}, except that it includes @file{coff/i960.h}
48 rather than @file{coff-m88k.h}.
51 Porting to a new version of coff
53 The recommended method is to select from the existing
54 implementations the version of coff which is most like the one
55 you want to use. For example, we'll say that i386 coff is
56 the one you select, and that your coff flavour is called foo.
57 Copy @file{i386coff.c} to @file{foocoff.c}, copy
58 @file{../include/coff/i386.h} to @file{../include/coff/foo.h},
59 and add the lines to @file{targets.c} and @file{Makefile.in}
60 so that your new back end is used. Alter the shapes of the
61 structures in @file{../include/coff/foo.h} so that they match
62 what you need. You will probably also have to add
63 @code{#ifdef}s to the code in @file{coff/internal.h} and
64 @file{coffcode.h} if your version of coff is too wild.
66 You can verify that your new BFD backend works quite simply by
67 building @file{objdump} from the @file{binutils} directory,
68 and making sure that its version of what's going on and your
69 host system's idea (assuming it has the pretty standard coff
70 dump utility, usually called @code{att-dump} or just
71 @code{dump}) are the same. Then clean up your code, and send
72 what you've done to Cygnus. Then your stuff will be in the
73 next release, and you won't have to keep integrating it.
76 How the coff backend works
81 The Coff backend is split into generic routines that are
82 applicable to any Coff target and routines that are specific
83 to a particular target. The target-specific routines are
84 further split into ones which are basically the same for all
85 Coff targets except that they use the external symbol format
86 or use different values for certain constants.
88 The generic routines are in @file{coffgen.c}. These routines
89 work for any Coff target. They use some hooks into the target
90 specific code; the hooks are in a @code{bfd_coff_backend_data}
91 structure, one of which exists for each target.
93 The essentially similar target-specific routines are in
94 @file{coffcode.h}. This header file includes executable C code.
95 The various Coff targets first include the appropriate Coff
96 header file, make any special defines that are needed, and
97 then include @file{coffcode.h}.
99 Some of the Coff targets then also have additional routines in
100 the target source file itself.
102 For example, @file{coff-i960.c} includes
103 @file{coff/internal.h} and @file{coff/i960.h}. It then
104 defines a few constants, such as @code{I960}, and includes
105 @file{coffcode.h}. Since the i960 has complex relocation
106 types, @file{coff-i960.c} also includes some code to
107 manipulate the i960 relocs. This code is not in
108 @file{coffcode.h} because it would not be used by any other
114 Each flavour of coff supported in BFD has its own header file
115 describing the external layout of the structures. There is also
116 an internal description of the coff layout, in
117 @file{coff/internal.h}. A major function of the
118 coff backend is swapping the bytes and twiddling the bits to
119 translate the external form of the structures into the normal
120 internal form. This is all performed in the
121 @code{bfd_swap}_@i{thing}_@i{direction} routines. Some
122 elements are different sizes between different versions of
123 coff; it is the duty of the coff version specific include file
124 to override the definitions of various packing routines in
125 @file{coffcode.h}. E.g., the size of line number entry in coff is
126 sometimes 16 bits, and sometimes 32 bits. @code{#define}ing
127 @code{PUT_LNSZ_LNNO} and @code{GET_LNSZ_LNNO} will select the
128 correct one. No doubt, some day someone will find a version of
129 coff which has a varying field size not catered to at the
130 moment. To port BFD, that person will have to add more @code{#defines}.
131 Three of the bit twiddling routines are exported to
132 @code{gdb}; @code{coff_swap_aux_in}, @code{coff_swap_sym_in}
133 and @code{coff_swap_linno_in}. @code{GDB} reads the symbol
134 table on its own, but uses BFD to fix things up. More of the
135 bit twiddlers are exported for @code{gas};
136 @code{coff_swap_aux_out}, @code{coff_swap_sym_out},
137 @code{coff_swap_lineno_out}, @code{coff_swap_reloc_out},
138 @code{coff_swap_filehdr_out}, @code{coff_swap_aouthdr_out},
139 @code{coff_swap_scnhdr_out}. @code{Gas} currently keeps track
140 of all the symbol table and reloc drudgery itself, thereby
141 saving the internal BFD overhead, but uses BFD to swap things
142 on the way out, making cross ports much safer. Doing so also
143 allows BFD (and thus the linker) to use the same header files
144 as @code{gas}, which makes one avenue to disaster disappear.
149 The simple canonical form for symbols used by BFD is not rich
150 enough to keep all the information available in a coff symbol
151 table. The back end gets around this problem by keeping the original
152 symbol table around, "behind the scenes".
154 When a symbol table is requested (through a call to
155 @code{bfd_canonicalize_symtab}), a request gets through to
156 @code{coff_get_normalized_symtab}. This reads the symbol table from
157 the coff file and swaps all the structures inside into the
158 internal form. It also fixes up all the pointers in the table
159 (represented in the file by offsets from the first symbol in
160 the table) into physical pointers to elements in the new
161 internal table. This involves some work since the meanings of
162 fields change depending upon context: a field that is a
163 pointer to another structure in the symbol table at one moment
164 may be the size in bytes of a structure at the next. Another
165 pass is made over the table. All symbols which mark file names
166 (<<C_FILE>> symbols) are modified so that the internal
167 string points to the value in the auxent (the real filename)
168 rather than the normal text associated with the symbol
171 At this time the symbol names are moved around. Coff stores
172 all symbols less than nine characters long physically
173 within the symbol table; longer strings are kept at the end of
174 the file in the string table. This pass moves all strings
175 into memory and replaces them with pointers to the strings.
178 The symbol table is massaged once again, this time to create
179 the canonical table used by the BFD application. Each symbol
180 is inspected in turn, and a decision made (using the
181 @code{sclass} field) about the various flags to set in the
182 @code{asymbol}. @xref{Symbols}. The generated canonical table
183 shares strings with the hidden internal symbol table.
185 Any linenumbers are read from the coff file too, and attached
186 to the symbols which own the functions the linenumbers belong to.
191 Writing a symbol to a coff file which didn't come from a coff
192 file will lose any debugging information. The @code{asymbol}
193 structure remembers the BFD from which the symbol was taken, and on
194 output the back end makes sure that the same destination target as
195 source target is present.
197 When the symbols have come from a coff file then all the
198 debugging information is preserved.
200 Symbol tables are provided for writing to the back end in a
201 vector of pointers to pointers. This allows applications like
202 the linker to accumulate and output large symbol tables
203 without having to do too much byte copying.
205 This function runs through the provided symbol table and
206 patches each symbol marked as a file place holder
207 (@code{C_FILE}) to point to the next file place holder in the
208 list. It also marks each @code{offset} field in the list with
209 the offset from the first symbol of the current symbol.
211 Another function of this procedure is to turn the canonical
212 value form of BFD into the form used by coff. Internally, BFD
213 expects symbol values to be offsets from a section base; so a
214 symbol physically at 0x120, but in a section starting at
215 0x100, would have the value 0x20. Coff expects symbols to
216 contain their final value, so symbols have their values
217 changed at this point to reflect their sum with their owning
218 section. This transformation uses the
219 <<output_section>> field of the @code{asymbol}'s
220 @code{asection} @xref{Sections}.
222 o <<coff_mangle_symbols>>
224 This routine runs though the provided symbol table and uses
225 the offsets generated by the previous pass and the pointers
226 generated when the symbol table was read in to create the
227 structured hierachy required by coff. It changes each pointer
228 to a symbol into the index into the symbol table of the asymbol.
230 o <<coff_write_symbols>>
232 This routine runs through the symbol table and patches up the
233 symbols from their internal form into the coff way, calls the
234 bit twiddlers, and writes out the table to the file.
243 The hidden information for an <<asymbol>> is described in a
244 <<combined_entry_type>>:
248 .typedef struct coff_ptr_struct
251 . {* Remembers the offset from the first symbol in the file for
252 . this symbol. Generated by coff_renumber_symbols. *}
253 .unsigned int offset;
255 . {* Should the value of this symbol be renumbered. Used for
256 . XCOFF C_BSTAT symbols. Set by coff_slurp_symbol_table. *}
257 .unsigned int fix_value : 1;
259 . {* Should the tag field of this symbol be renumbered.
260 . Created by coff_pointerize_aux. *}
261 .unsigned int fix_tag : 1;
263 . {* Should the endidx field of this symbol be renumbered.
264 . Created by coff_pointerize_aux. *}
265 .unsigned int fix_end : 1;
267 . {* Should the x_csect.x_scnlen field be renumbered.
268 . Created by coff_slurp_symbol_table. *}
269 .unsigned int fix_scnlen : 1;
271 . {* The container for the symbol structure as read and translated
275 . union internal_auxent auxent;
276 . struct internal_syment syment;
278 .} combined_entry_type;
281 .{* Each canonical asymbol really looks like this: *}
283 .typedef struct coff_symbol_struct
285 . {* The actual symbol which the rest of BFD works with *}
288 . {* A pointer to the hidden information for this symbol *}
289 .combined_entry_type *native;
291 . {* A pointer to the linenumber information for this symbol *}
292 .struct lineno_cache_entry *lineno;
294 . {* Have the line numbers been relocated yet ? *}
295 .boolean done_lineno;
301 #include "coffswap.h"
303 /* void warning(); */
306 * Return a word with STYP_* (scnhdr.s_flags) flags set to represent the
307 * incoming SEC_* flags. The inverse of this function is styp_to_sec_flags().
308 * NOTE: If you add to/change this routine, you should mirror the changes
309 * in styp_to_sec_flags().
312 sec_to_styp_flags (sec_name
, sec_flags
)
313 CONST
char *sec_name
;
318 if (!strcmp (sec_name
, _TEXT
))
320 styp_flags
= STYP_TEXT
;
322 else if (!strcmp (sec_name
, _DATA
))
324 styp_flags
= STYP_DATA
;
327 else if (!strcmp (sec_name
, ".data2"))
329 styp_flags
= STYP_DATA
;
330 #endif /* TWO_DATA_SECS */
332 else if (!strcmp (sec_name
, _BSS
))
334 styp_flags
= STYP_BSS
;
337 else if (!strcmp (sec_name
, _COMMENT
))
339 styp_flags
= STYP_INFO
;
340 #endif /* _COMMENT */
343 else if (!strcmp (sec_name
, _LIB
))
345 styp_flags
= STYP_LIB
;
349 else if (!strcmp (sec_name
, _LIT
))
351 styp_flags
= STYP_LIT
;
354 else if (!strcmp (sec_name
, ".debug"))
357 styp_flags
= STYP_DEBUG
;
359 styp_flags
= STYP_INFO
;
362 else if (!strcmp (sec_name
, ".stab")
363 || !strncmp (sec_name
, ".stabstr", 8))
365 styp_flags
= STYP_INFO
;
367 /* Try and figure out what it should be */
368 else if (sec_flags
& SEC_CODE
)
370 styp_flags
= STYP_TEXT
;
372 else if (sec_flags
& SEC_DATA
)
374 styp_flags
= STYP_DATA
;
376 else if (sec_flags
& SEC_READONLY
)
378 #ifdef STYP_LIT /* 29k readonly text/data section */
379 styp_flags
= STYP_LIT
;
381 styp_flags
= STYP_TEXT
;
382 #endif /* STYP_LIT */
384 else if (sec_flags
& SEC_LOAD
)
386 styp_flags
= STYP_TEXT
;
388 else if (sec_flags
& SEC_ALLOC
)
390 styp_flags
= STYP_BSS
;
394 if (sec_flags
& SEC_NEVER_LOAD
)
395 styp_flags
|= STYP_NOLOAD
;
401 * Return a word with SEC_* flags set to represent the incoming
402 * STYP_* flags (from scnhdr.s_flags). The inverse of this
403 * function is sec_to_styp_flags().
404 * NOTE: If you add to/change this routine, you should mirror the changes
405 * in sec_to_styp_flags().
408 styp_to_sec_flags (abfd
, hdr
)
412 struct internal_scnhdr
*internal_s
= (struct internal_scnhdr
*) hdr
;
413 long styp_flags
= internal_s
->s_flags
;
414 flagword sec_flags
= 0;
417 if (styp_flags
& STYP_NOLOAD
)
419 sec_flags
|= SEC_NEVER_LOAD
;
421 #endif /* STYP_NOLOAD */
423 /* For 386 COFF, at least, an unloadable text or data section is
424 actually a shared library section. */
425 if (styp_flags
& STYP_TEXT
)
427 if (sec_flags
& SEC_NEVER_LOAD
)
428 sec_flags
|= SEC_CODE
| SEC_SHARED_LIBRARY
;
430 sec_flags
|= SEC_CODE
| SEC_LOAD
| SEC_ALLOC
;
432 else if (styp_flags
& STYP_DATA
)
434 if (sec_flags
& SEC_NEVER_LOAD
)
435 sec_flags
|= SEC_DATA
| SEC_SHARED_LIBRARY
;
437 sec_flags
|= SEC_DATA
| SEC_LOAD
| SEC_ALLOC
;
439 else if (styp_flags
& STYP_BSS
)
441 #ifdef BSS_NOLOAD_IS_SHARED_LIBRARY
442 if (sec_flags
& SEC_NEVER_LOAD
)
443 sec_flags
|= SEC_ALLOC
| SEC_SHARED_LIBRARY
;
446 sec_flags
|= SEC_ALLOC
;
448 else if (styp_flags
& STYP_INFO
)
450 /* This should be marked as SEC_DEBUGGING, but that can't be
451 done until we make sure that strip can still work. strip
452 will probably have to preserve the same number of sections to
453 ensure that the section vma matches the section file
458 sec_flags
|= SEC_ALLOC
| SEC_LOAD
;
461 #ifdef STYP_LIT /* A29k readonly text/data section type */
462 if ((styp_flags
& STYP_LIT
) == STYP_LIT
)
464 sec_flags
= (SEC_LOAD
| SEC_ALLOC
| SEC_READONLY
);
466 #endif /* STYP_LIT */
467 #ifdef STYP_OTHER_LOAD /* Other loaded sections */
468 if (styp_flags
& STYP_OTHER_LOAD
)
470 sec_flags
= (SEC_LOAD
| SEC_ALLOC
);
472 #endif /* STYP_SDATA */
477 #define get_index(symbol) ((long) (symbol)->udata)
481 bfd_coff_backend_data
485 Special entry points for gdb to swap in coff symbol table parts:
488 . void (*_bfd_coff_swap_aux_in) PARAMS ((
497 . void (*_bfd_coff_swap_sym_in) PARAMS ((
502 . void (*_bfd_coff_swap_lineno_in) PARAMS ((
508 Special entry points for gas to swap out coff parts:
510 . unsigned int (*_bfd_coff_swap_aux_out) PARAMS ((
519 . unsigned int (*_bfd_coff_swap_sym_out) PARAMS ((
524 . unsigned int (*_bfd_coff_swap_lineno_out) PARAMS ((
529 . unsigned int (*_bfd_coff_swap_reloc_out) PARAMS ((
534 . unsigned int (*_bfd_coff_swap_filehdr_out) PARAMS ((
539 . unsigned int (*_bfd_coff_swap_aouthdr_out) PARAMS ((
544 . unsigned int (*_bfd_coff_swap_scnhdr_out) PARAMS ((
550 Special entry points for generic COFF routines to call target
551 dependent COFF routines:
553 . unsigned int _bfd_filhsz;
554 . unsigned int _bfd_aoutsz;
555 . unsigned int _bfd_scnhsz;
556 . unsigned int _bfd_symesz;
557 . unsigned int _bfd_auxesz;
558 . unsigned int _bfd_linesz;
559 . boolean _bfd_coff_long_filenames;
560 . void (*_bfd_coff_swap_filehdr_in) PARAMS ((
564 . void (*_bfd_coff_swap_aouthdr_in) PARAMS ((
568 . void (*_bfd_coff_swap_scnhdr_in) PARAMS ((
572 . boolean (*_bfd_coff_bad_format_hook) PARAMS ((
574 . PTR internal_filehdr));
575 . boolean (*_bfd_coff_set_arch_mach_hook) PARAMS ((
577 . PTR internal_filehdr));
578 . PTR (*_bfd_coff_mkobject_hook) PARAMS ((
580 . PTR internal_filehdr,
581 . PTR internal_aouthdr));
582 . flagword (*_bfd_styp_to_sec_flags_hook) PARAMS ((
584 . PTR internal_scnhdr));
585 . asection *(*_bfd_make_section_hook) PARAMS ((
588 . void (*_bfd_set_alignment_hook) PARAMS ((
591 . PTR internal_scnhdr));
592 . boolean (*_bfd_coff_slurp_symbol_table) PARAMS ((
594 . boolean (*_bfd_coff_symname_in_debug) PARAMS ((
596 . struct internal_syment *sym));
597 . void (*_bfd_coff_reloc16_extra_cases) PARAMS ((
599 . struct bfd_link_info *link_info,
600 . struct bfd_link_order *link_order,
603 . unsigned int *src_ptr,
604 . unsigned int *dst_ptr));
605 . int (*_bfd_coff_reloc16_estimate) PARAMS ((
607 . asection *input_section,
609 . unsigned int shrink,
610 . struct bfd_link_info *link_info));
612 .} bfd_coff_backend_data;
614 .#define coff_backend_info(abfd) ((bfd_coff_backend_data *) (abfd)->xvec->backend_data)
616 .#define bfd_coff_swap_aux_in(a,e,t,c,ind,num,i) \
617 . ((coff_backend_info (a)->_bfd_coff_swap_aux_in) (a,e,t,c,ind,num,i))
619 .#define bfd_coff_swap_sym_in(a,e,i) \
620 . ((coff_backend_info (a)->_bfd_coff_swap_sym_in) (a,e,i))
622 .#define bfd_coff_swap_lineno_in(a,e,i) \
623 . ((coff_backend_info ( a)->_bfd_coff_swap_lineno_in) (a,e,i))
625 .#define bfd_coff_swap_reloc_out(abfd, i, o) \
626 . ((coff_backend_info (abfd)->_bfd_coff_swap_reloc_out) (abfd, i, o))
628 .#define bfd_coff_swap_lineno_out(abfd, i, o) \
629 . ((coff_backend_info (abfd)->_bfd_coff_swap_lineno_out) (abfd, i, o))
631 .#define bfd_coff_swap_aux_out(a,i,t,c,ind,num,o) \
632 . ((coff_backend_info (a)->_bfd_coff_swap_aux_out) (a,i,t,c,ind,num,o))
634 .#define bfd_coff_swap_sym_out(abfd, i,o) \
635 . ((coff_backend_info (abfd)->_bfd_coff_swap_sym_out) (abfd, i, o))
637 .#define bfd_coff_swap_scnhdr_out(abfd, i,o) \
638 . ((coff_backend_info (abfd)->_bfd_coff_swap_scnhdr_out) (abfd, i, o))
640 .#define bfd_coff_swap_filehdr_out(abfd, i,o) \
641 . ((coff_backend_info (abfd)->_bfd_coff_swap_filehdr_out) (abfd, i, o))
643 .#define bfd_coff_swap_aouthdr_out(abfd, i,o) \
644 . ((coff_backend_info (abfd)->_bfd_coff_swap_aouthdr_out) (abfd, i, o))
646 .#define bfd_coff_filhsz(abfd) (coff_backend_info (abfd)->_bfd_filhsz)
647 .#define bfd_coff_aoutsz(abfd) (coff_backend_info (abfd)->_bfd_aoutsz)
648 .#define bfd_coff_scnhsz(abfd) (coff_backend_info (abfd)->_bfd_scnhsz)
649 .#define bfd_coff_symesz(abfd) (coff_backend_info (abfd)->_bfd_symesz)
650 .#define bfd_coff_auxesz(abfd) (coff_backend_info (abfd)->_bfd_auxesz)
651 .#define bfd_coff_linesz(abfd) (coff_backend_info (abfd)->_bfd_linesz)
652 .#define bfd_coff_long_filenames(abfd) (coff_backend_info (abfd)->_bfd_coff_long_filenames)
653 .#define bfd_coff_swap_filehdr_in(abfd, i,o) \
654 . ((coff_backend_info (abfd)->_bfd_coff_swap_filehdr_in) (abfd, i, o))
656 .#define bfd_coff_swap_aouthdr_in(abfd, i,o) \
657 . ((coff_backend_info (abfd)->_bfd_coff_swap_aouthdr_in) (abfd, i, o))
659 .#define bfd_coff_swap_scnhdr_in(abfd, i,o) \
660 . ((coff_backend_info (abfd)->_bfd_coff_swap_scnhdr_in) (abfd, i, o))
662 .#define bfd_coff_bad_format_hook(abfd, filehdr) \
663 . ((coff_backend_info (abfd)->_bfd_coff_bad_format_hook) (abfd, filehdr))
665 .#define bfd_coff_set_arch_mach_hook(abfd, filehdr)\
666 . ((coff_backend_info (abfd)->_bfd_coff_set_arch_mach_hook) (abfd, filehdr))
667 .#define bfd_coff_mkobject_hook(abfd, filehdr, aouthdr)\
668 . ((coff_backend_info (abfd)->_bfd_coff_mkobject_hook) (abfd, filehdr, aouthdr))
670 .#define bfd_coff_styp_to_sec_flags_hook(abfd, scnhdr)\
671 . ((coff_backend_info (abfd)->_bfd_styp_to_sec_flags_hook) (abfd, scnhdr))
673 .#define bfd_coff_make_section_hook(abfd, name)\
674 . ((coff_backend_info (abfd)->_bfd_make_section_hook) (abfd, name))
676 .#define bfd_coff_set_alignment_hook(abfd, sec, scnhdr)\
677 . ((coff_backend_info (abfd)->_bfd_set_alignment_hook) (abfd, sec, scnhdr))
679 .#define bfd_coff_slurp_symbol_table(abfd)\
680 . ((coff_backend_info (abfd)->_bfd_coff_slurp_symbol_table) (abfd))
682 .#define bfd_coff_symname_in_debug(abfd, sym)\
683 . ((coff_backend_info (abfd)->_bfd_coff_symname_in_debug) (abfd, sym))
685 .#define bfd_coff_reloc16_extra_cases(abfd, link_info, link_order, reloc, data, src_ptr, dst_ptr)\
686 . ((coff_backend_info (abfd)->_bfd_coff_reloc16_extra_cases)\
687 . (abfd, link_info, link_order, reloc, data, src_ptr, dst_ptr))
689 .#define bfd_coff_reloc16_estimate(abfd, section, reloc, shrink, link_info)\
690 . ((coff_backend_info (abfd)->_bfd_coff_reloc16_estimate)\
691 . (abfd, section, reloc, shrink, link_info))
695 /* See whether the magic number matches. */
698 coff_bad_format_hook (abfd
, filehdr
)
702 struct internal_filehdr
*internal_f
= (struct internal_filehdr
*) filehdr
;
704 if (BADMAG (*internal_f
))
707 /* if the optional header is NULL or not the correct size then
708 quit; the only difference I can see between m88k dgux headers (MC88DMAGIC)
709 and Intel 960 readwrite headers (I960WRMAGIC) is that the
710 optional header is of a different size.
712 But the mips keeps extra stuff in it's opthdr, so dont check
716 #if defined(M88) || defined(I960)
717 if (internal_f
->f_opthdr
!= 0 && AOUTSZ
!= internal_f
->f_opthdr
)
725 coff_make_section_hook (abfd
, name
)
730 /* FIXME: This predates the call to bfd_make_section_anyway
731 in make_a_section_from_file, and can probably go away. */
732 /* On SCO a file created by the Microsoft assembler can have two
733 .data sections. We use .data2 for the second one. */
734 if (strcmp (name
, _DATA
) == 0)
735 return bfd_make_section (abfd
, ".data2");
737 return (asection
*) NULL
;
741 initialize a section structure with information peculiar to this
742 particular implementation of coff
746 coff_new_section_hook (abfd
, section
)
750 section
->alignment_power
= abfd
->xvec
->align_power_min
;
751 /* Allocate aux records for section symbols, to store size and
754 @@ Shouldn't use constant multiplier here! */
755 coffsymbol (section
->symbol
)->native
=
756 (combined_entry_type
*) bfd_zalloc (abfd
,
757 sizeof (combined_entry_type
) * 10);
764 /* Set the alignment of a BFD section. */
767 coff_set_alignment_hook (abfd
, section
, scnhdr
)
772 struct internal_scnhdr
*hdr
= (struct internal_scnhdr
*) scnhdr
;
775 for (i
= 0; i
< 32; i
++)
776 if ((1 << i
) >= hdr
->s_align
)
778 section
->alignment_power
= i
;
783 #define coff_set_alignment_hook \
784 ((void (*) PARAMS ((bfd *, asection *, PTR))) bfd_void)
792 coff_data_type
*coff
;
794 abfd
->tdata
.coff_obj_data
= (struct coff_tdata
*) bfd_zalloc (abfd
, sizeof (coff_data_type
));
795 if (abfd
->tdata
.coff_obj_data
== 0)
797 bfd_set_error (bfd_error_no_memory
);
800 coff
= coff_data (abfd
);
801 coff
->symbols
= (coff_symbol_type
*) NULL
;
802 coff
->conversion_table
= (unsigned int *) NULL
;
803 coff
->raw_syments
= (struct coff_ptr_struct
*) NULL
;
804 coff
->raw_linenos
= (struct lineno
*) NULL
;
806 /* make_abs_section(abfd);*/
810 /* Create the COFF backend specific information. */
813 coff_mkobject_hook (abfd
, filehdr
, aouthdr
)
818 struct internal_filehdr
*internal_f
= (struct internal_filehdr
*) filehdr
;
819 coff_data_type
*coff
;
821 if (coff_mkobject (abfd
) == false)
824 coff
= coff_data (abfd
);
826 coff
->sym_filepos
= internal_f
->f_symptr
;
827 coff
->flags
= internal_f
->f_flags
;
829 /* These members communicate important constants about the symbol
830 table to GDB's symbol-reading code. These `constants'
831 unfortunately vary among coff implementations... */
832 coff
->local_n_btmask
= N_BTMASK
;
833 coff
->local_n_btshft
= N_BTSHFT
;
834 coff
->local_n_tmask
= N_TMASK
;
835 coff
->local_n_tshift
= N_TSHIFT
;
836 coff
->local_symesz
= SYMESZ
;
837 coff
->local_auxesz
= AUXESZ
;
838 coff
->local_linesz
= LINESZ
;
843 /* Determine the machine architecture and type. FIXME: This is target
844 dependent because the magic numbers are defined in the target
845 dependent header files. But there is no particular need for this.
846 If the magic numbers were moved to a separate file, this function
847 would be target independent and would also be much more successful
848 at linking together COFF files for different architectures. */
851 coff_set_arch_mach_hook (abfd
, filehdr
)
856 enum bfd_architecture arch
;
857 struct internal_filehdr
*internal_f
= (struct internal_filehdr
*) filehdr
;
860 switch (internal_f
->f_magic
)
865 case I386AIXMAGIC
: /* Danbury PS/2 AIX C Compiler */
866 case LYNXCOFFMAGIC
: /* shadows the m68k Lynx number below, sigh */
867 arch
= bfd_arch_i386
;
872 #ifdef A29K_MAGIC_BIG
874 case A29K_MAGIC_LITTLE
:
875 arch
= bfd_arch_a29k
;
886 #ifdef APOLLOM68KMAGIC
887 case APOLLOM68KMAGIC
:
892 arch
= bfd_arch_m68k
;
900 arch
= bfd_arch_m88k
;
907 switch (internal_f
->f_flags
& F_MACHMASK
)
910 machine
= bfd_mach_z8001
;
913 machine
= bfd_mach_z8002
;
924 arch
= bfd_arch_i960
;
925 switch (F_I960TYPE
& internal_f
->f_flags
)
929 machine
= bfd_mach_i960_core
;
932 machine
= bfd_mach_i960_kb_sb
;
935 machine
= bfd_mach_i960_mc
;
938 machine
= bfd_mach_i960_xa
;
941 machine
= bfd_mach_i960_ca
;
944 machine
= bfd_mach_i960_ka_sa
;
955 arch
= bfd_arch_rs6000
;
962 arch
= bfd_arch_we32k
;
969 arch
= bfd_arch_h8300
;
970 machine
= bfd_mach_h8300
;
971 /* !! FIXME this probably isn't the right place for this */
972 abfd
->flags
|= BFD_IS_RELAXABLE
;
978 arch
= bfd_arch_h8300
;
979 machine
= bfd_mach_h8300h
;
980 /* !! FIXME this probably isn't the right place for this */
981 abfd
->flags
|= BFD_IS_RELAXABLE
;
994 arch
= bfd_arch_h8500
;
1001 arch
= bfd_arch_sparc
;
1006 default: /* Unreadable input file type */
1007 arch
= bfd_arch_obscure
;
1011 bfd_default_set_arch_mach (abfd
, arch
, machine
);
1015 #ifdef SYMNAME_IN_DEBUG
1018 symname_in_debug_hook (abfd
, sym
)
1020 struct internal_syment
*sym
;
1022 return SYMNAME_IN_DEBUG (sym
) ? true : false;
1027 #define symname_in_debug_hook \
1028 (boolean (*) PARAMS ((bfd *, struct internal_syment *))) bfd_false
1036 To write relocations, the back end steps though the
1037 canonical relocation table and create an
1038 @code{internal_reloc}. The symbol index to use is removed from
1039 the @code{offset} field in the symbol table supplied. The
1040 address comes directly from the sum of the section base
1041 address and the relocation offset; the type is dug directly
1042 from the howto field. Then the @code{internal_reloc} is
1043 swapped into the shape of an @code{external_reloc} and written
1049 coff_write_relocs (abfd
)
1053 for (s
= abfd
->sections
; s
!= (asection
*) NULL
; s
= s
->next
)
1056 struct external_reloc dst
;
1058 arelent
**p
= s
->orelocation
;
1059 bfd_seek (abfd
, s
->rel_filepos
, SEEK_SET
);
1060 for (i
= 0; i
< s
->reloc_count
; i
++)
1062 struct internal_reloc n
;
1064 memset ((PTR
) & n
, 0, sizeof (n
));
1066 n
.r_vaddr
= q
->address
+ s
->vma
;
1069 /* The 29k const/consth reloc pair is a real kludge. The consth
1070 part doesn't have a symbol; it has an offset. So rebuilt
1072 if (q
->howto
->type
== R_IHCONST
)
1073 n
.r_symndx
= q
->addend
;
1078 if (q
->sym_ptr_ptr
== bfd_abs_section
.symbol_ptr_ptr
)
1079 /* This is a relocation relative to the absolute symbol. */
1083 n
.r_symndx
= get_index ((*(q
->sym_ptr_ptr
)));
1084 /* Take notice if the symbol reloc points to a symbol
1085 we don't have in our symbol table. What should we
1087 if (n
.r_symndx
> obj_conv_table_size (abfd
))
1092 #ifdef SWAP_OUT_RELOC_OFFSET
1093 n
.r_offset
= q
->addend
;
1097 /* Work out reloc type from what is required */
1098 SELECT_RELOC (n
, q
->howto
);
1100 n
.r_type
= q
->howto
->type
;
1102 coff_swap_reloc_out (abfd
, &n
, &dst
);
1103 bfd_write ((PTR
) & dst
, 1, RELSZ
, abfd
);
1108 /* Set flags and magic number of a coff file from architecture and machine
1109 type. Result is true if we can represent the arch&type, false if not. */
1112 coff_set_flags (abfd
, magicp
, flagsp
)
1115 unsigned short *flagsp
;
1117 switch (bfd_get_arch (abfd
))
1122 switch (bfd_get_mach (abfd
))
1124 case bfd_mach_z8001
:
1127 case bfd_mach_z8002
:
1141 *magicp
= I960ROMAGIC
;
1143 ((bfd_get_file_flags(abfd) & WP_TEXT) ? I960ROMAGIC :
1144 I960RWMAGIC); FIXME???
1146 switch (bfd_get_mach (abfd
))
1148 case bfd_mach_i960_core
:
1151 case bfd_mach_i960_kb_sb
:
1154 case bfd_mach_i960_mc
:
1157 case bfd_mach_i960_xa
:
1160 case bfd_mach_i960_ca
:
1163 case bfd_mach_i960_ka_sa
:
1176 *magicp
= I386MAGIC
;
1178 /* Just overwrite the usual value if we're doing Lynx. */
1179 *magicp
= LYNXCOFFMAGIC
;
1186 #ifdef APOLLOM68KMAGIC
1187 *magicp
= APOLLO_COFF_VERSION_NUMBER
;
1189 *magicp
= MC68MAGIC
;
1192 /* Just overwrite the usual value if we're doing Lynx. */
1193 *magicp
= LYNXCOFFMAGIC
;
1201 *magicp
= MC88OMAGIC
;
1206 case bfd_arch_h8300
:
1207 switch (bfd_get_mach (abfd
))
1209 case bfd_mach_h8300
:
1210 *magicp
= H8300MAGIC
;
1212 case bfd_mach_h8300h
:
1213 *magicp
= H8300HMAGIC
;
1227 case bfd_arch_sparc
:
1228 *magicp
= SPARCMAGIC
;
1230 /* Just overwrite the usual value if we're doing Lynx. */
1231 *magicp
= LYNXCOFFMAGIC
;
1238 case bfd_arch_h8500
:
1239 *magicp
= H8500MAGIC
;
1243 #ifdef A29K_MAGIC_BIG
1245 if (abfd
->xvec
->byteorder_big_p
)
1246 *magicp
= A29K_MAGIC_BIG
;
1248 *magicp
= A29K_MAGIC_LITTLE
;
1254 case bfd_arch_we32k
:
1255 *magicp
= WE32KMAGIC
;
1261 case bfd_arch_rs6000
:
1262 case bfd_arch_powerpc
:
1263 *magicp
= U802TOCMAGIC
;
1268 default: /* Unknown architecture */
1269 /* return false; -- fall through to "return false" below, to avoid
1270 "statement never reached" errors on the one below. */
1279 coff_set_arch_mach (abfd
, arch
, machine
)
1281 enum bfd_architecture arch
;
1282 unsigned long machine
;
1285 unsigned short dummy2
;
1286 bfd_default_set_arch_mach (abfd
, arch
, machine
);
1288 if (arch
!= bfd_arch_unknown
&&
1289 coff_set_flags (abfd
, &dummy1
, &dummy2
) != true)
1290 return false; /* We can't represent this type */
1291 return true; /* We're easy ... */
1295 /* Calculate the file position for each section. */
1298 coff_compute_section_file_positions (abfd
)
1302 asection
*previous
= (asection
*) NULL
;
1303 file_ptr sofar
= FILHSZ
;
1307 if (bfd_get_start_address (abfd
))
1309 /* A start address may have been added to the original file. In this
1310 case it will need an optional header to record it. */
1311 abfd
->flags
|= EXEC_P
;
1314 if (abfd
->flags
& EXEC_P
)
1317 sofar
+= abfd
->section_count
* SCNHSZ
;
1318 for (current
= abfd
->sections
;
1319 current
!= (asection
*) NULL
;
1320 current
= current
->next
)
1323 /* Only deal with sections which have contents */
1324 if (!(current
->flags
& SEC_HAS_CONTENTS
))
1327 /* Align the sections in the file to the same boundary on
1328 which they are aligned in virtual memory. I960 doesn't
1329 do this (FIXME) so we can stay in sync with Intel. 960
1330 doesn't yet page from files... */
1333 /* make sure this section is aligned on the right boundary - by
1334 padding the previous section up if necessary */
1337 sofar
= BFD_ALIGN (sofar
, 1 << current
->alignment_power
);
1338 if (previous
!= (asection
*) NULL
)
1340 previous
->_raw_size
+= sofar
- old_sofar
;
1345 /* FIXME, in demand paged files, the low order bits of the file
1346 offset must match the low order bits of the virtual address.
1347 "Low order" is apparently implementation defined. Add code
1348 here to round sofar up to match the virtual address. */
1350 current
->filepos
= sofar
;
1352 sofar
+= current
->_raw_size
;
1354 /* make sure that this section is of the right size too */
1356 sofar
= BFD_ALIGN (sofar
, 1 << current
->alignment_power
);
1357 current
->_raw_size
+= sofar
- old_sofar
;
1361 /* Force .lib sections to start at zero. The vma is then
1362 incremented in coff_set_section_contents. This is right for
1364 if (strcmp (current
->name
, _LIB
) == 0)
1365 bfd_set_section_vma (abfd
, current
, 0);
1370 obj_relocbase (abfd
) = sofar
;
1373 #ifndef RS6000COFF_C
1375 /* If .file, .text, .data, .bss symbols are missing, add them. */
1376 /* @@ Should we only be adding missing symbols, or overriding the aux
1377 values for existing section symbols? */
1379 coff_add_missing_symbols (abfd
)
1382 unsigned int nsyms
= bfd_get_symcount (abfd
);
1383 asymbol
**sympp
= abfd
->outsymbols
;
1386 int need_text
= 1, need_data
= 1, need_bss
= 1, need_file
= 1;
1388 for (i
= 0; i
< nsyms
; i
++)
1390 coff_symbol_type
*csym
= coff_symbol_from (abfd
, sympp
[i
]);
1394 /* only do this if there is a coff representation of the input
1396 if (csym
->native
&& csym
->native
->u
.syment
.n_sclass
== C_FILE
)
1401 name
= csym
->symbol
.name
;
1404 if (!strcmp (name
, _TEXT
))
1407 else if (!strcmp (name
, ".wtext"))
1410 else if (!strcmp (name
, _DATA
))
1412 else if (!strcmp (name
, _BSS
))
1416 /* Now i == bfd_get_symcount (abfd). */
1417 /* @@ For now, don't deal with .file symbol. */
1420 if (!need_text
&& !need_data
&& !need_bss
&& !need_file
)
1422 nsyms
+= need_text
+ need_data
+ need_bss
+ need_file
;
1423 sympp2
= (asymbol
**) bfd_alloc_by_size_t (abfd
, nsyms
* sizeof (asymbol
*));
1426 bfd_set_error (bfd_error_no_memory
);
1429 memcpy (sympp2
, sympp
, i
* sizeof (asymbol
*));
1432 /* @@ Generate fake .file symbol, in sympp2[i], and increment i. */
1436 sympp2
[i
++] = coff_section_symbol (abfd
, _TEXT
);
1438 sympp2
[i
++] = coff_section_symbol (abfd
, _DATA
);
1440 sympp2
[i
++] = coff_section_symbol (abfd
, _BSS
);
1441 BFD_ASSERT (i
== nsyms
);
1442 bfd_set_symtab (abfd
, sympp2
, nsyms
);
1446 #endif /* ! defined (RS6000COFF_C) */
1451 coff_write_object_contents (abfd
)
1457 boolean hasrelocs
= false;
1458 boolean haslinno
= false;
1459 file_ptr reloc_base
;
1460 file_ptr lineno_base
;
1464 unsigned long reloc_size
= 0;
1465 unsigned long lnno_size
= 0;
1466 asection
*text_sec
= NULL
;
1467 asection
*data_sec
= NULL
;
1468 asection
*bss_sec
= NULL
;
1470 struct internal_filehdr internal_f
;
1471 struct internal_aouthdr internal_a
;
1474 bfd_set_error (bfd_error_system_call
);
1475 /* Number the output sections, starting from one on the first section
1476 with a name which doesn't start with a *.
1477 @@ The code doesn't make this check. Is it supposed to be done,
1480 for (current
= abfd
->sections
; current
!= (asection
*) NULL
;
1481 current
= current
->next
)
1483 current
->target_index
= count
;
1487 if (abfd
->output_has_begun
== false)
1489 coff_compute_section_file_positions (abfd
);
1492 if (abfd
->sections
!= (asection
*) NULL
)
1494 scn_base
= abfd
->sections
->filepos
;
1500 if (bfd_seek (abfd
, scn_base
, SEEK_SET
) != 0)
1502 reloc_base
= obj_relocbase (abfd
);
1504 /* Make a pass through the symbol table to count line number entries and
1505 put them into the correct asections */
1507 lnno_size
= coff_count_linenumbers (abfd
) * LINESZ
;
1508 data_base
= scn_base
;
1510 /* Work out the size of the reloc and linno areas */
1512 for (current
= abfd
->sections
; current
!= NULL
; current
=
1515 /* We give section headers to +ve indexes */
1516 if (current
->target_index
> 0)
1519 reloc_size
+= current
->reloc_count
* RELSZ
;
1520 data_base
+= SCNHSZ
;
1525 lineno_base
= reloc_base
+ reloc_size
;
1526 sym_base
= lineno_base
+ lnno_size
;
1528 /* Indicate in each section->line_filepos its actual file address */
1529 for (current
= abfd
->sections
; current
!= NULL
; current
=
1532 if (current
->target_index
> 0)
1535 if (current
->lineno_count
)
1537 current
->line_filepos
= lineno_base
;
1538 current
->moving_line_filepos
= lineno_base
;
1539 lineno_base
+= current
->lineno_count
* LINESZ
;
1543 current
->line_filepos
= 0;
1545 if (current
->reloc_count
)
1547 current
->rel_filepos
= reloc_base
;
1548 reloc_base
+= current
->reloc_count
* RELSZ
;
1552 current
->rel_filepos
= 0;
1559 /* Write section headers to the file. */
1560 internal_f
.f_nscns
= 0;
1562 (file_ptr
) ((abfd
->flags
& EXEC_P
) ?
1563 (FILHSZ
+ AOUTSZ
) : FILHSZ
),
1568 unsigned int pad
= abfd
->flags
& D_PAGED
? data_base
: 0;
1570 unsigned int pad
= 0;
1572 for (current
= abfd
->sections
;
1574 current
= current
->next
)
1576 struct internal_scnhdr section
;
1577 if (current
->target_index
> 0)
1579 internal_f
.f_nscns
++;
1580 strncpy (&(section
.s_name
[0]), current
->name
, 8);
1582 /* Always set s_vaddr of .lib to 0. This is right for SVR3.2
1583 Ian Taylor <ian@cygnus.com>. */
1584 if (strcmp (current
->name
, _LIB
) == 0)
1585 section
.s_vaddr
= 0;
1588 section
.s_vaddr
= current
->lma
+ pad
;
1589 section
.s_paddr
= current
->lma
+ pad
;
1590 section
.s_size
= current
->_raw_size
- pad
;
1592 If this section has no size or is unloadable then the scnptr
1595 if (current
->_raw_size
- pad
== 0 ||
1596 (current
->flags
& (SEC_LOAD
| SEC_HAS_CONTENTS
)) == 0)
1598 section
.s_scnptr
= 0;
1602 section
.s_scnptr
= current
->filepos
;
1604 section
.s_relptr
= current
->rel_filepos
;
1605 section
.s_lnnoptr
= current
->line_filepos
;
1606 section
.s_nreloc
= current
->reloc_count
;
1607 section
.s_nlnno
= current
->lineno_count
;
1608 if (current
->reloc_count
!= 0)
1610 if (current
->lineno_count
!= 0)
1613 section
.s_flags
= sec_to_styp_flags (current
->name
, current
->flags
);
1615 if (!strcmp (current
->name
, _TEXT
))
1619 else if (!strcmp (current
->name
, _DATA
))
1622 #ifdef TWO_DATA_SECS
1624 else if (!strcmp (current
->name
, ".data2"))
1627 #endif /* TWO_DATA_SECS */
1629 else if (!strcmp (current
->name
, _BSS
))
1635 section
.s_align
= (current
->alignment_power
1636 ? 1 << current
->alignment_power
1643 coff_swap_scnhdr_out (abfd
, §ion
, &buff
);
1644 bfd_write ((PTR
) (&buff
), 1, SCNHSZ
, abfd
);
1654 /* OK, now set up the filehdr... */
1656 /* Don't include the internal abs section in the section count */
1659 We will NOT put a fucking timestamp in the header here. Every time you
1660 put it back, I will come in and take it out again. I'm sorry. This
1661 field does not belong here. We fill it with a 0 so it compares the
1662 same but is not a reasonable time. -- gnu@cygnus.com
1664 internal_f
.f_timdat
= 0;
1666 if (bfd_get_symcount (abfd
) != 0)
1667 internal_f
.f_symptr
= sym_base
;
1669 internal_f
.f_symptr
= 0;
1671 internal_f
.f_flags
= 0;
1673 if (abfd
->flags
& EXEC_P
)
1674 internal_f
.f_opthdr
= AOUTSZ
;
1676 internal_f
.f_opthdr
= 0;
1679 internal_f
.f_flags
|= F_RELFLG
;
1681 internal_f
.f_flags
|= F_LNNO
;
1682 if (0 == bfd_get_symcount (abfd
))
1683 internal_f
.f_flags
|= F_LSYMS
;
1684 if (abfd
->flags
& EXEC_P
)
1685 internal_f
.f_flags
|= F_EXEC
;
1687 if (!abfd
->xvec
->byteorder_big_p
)
1688 internal_f
.f_flags
|= F_AR32WR
;
1690 internal_f
.f_flags
|= F_AR32W
;
1693 FIXME, should do something about the other byte orders and
1697 memset (&internal_a
, 0, sizeof internal_a
);
1699 /* Set up architecture-dependent stuff */
1702 unsigned int magic
= 0;
1703 unsigned short flags
= 0;
1704 coff_set_flags (abfd
, &magic
, &flags
);
1705 internal_f
.f_magic
= magic
;
1706 internal_f
.f_flags
|= flags
;
1707 /* ...and the "opt"hdr... */
1710 #ifdef ULTRA3 /* NYU's machine */
1711 /* FIXME: This is a bogus check. I really want to see if there
1712 * is a .shbss or a .shdata section, if so then set the magic
1713 * number to indicate a shared data executable.
1715 if (internal_f
.f_nscns
>= 7)
1716 internal_a
.magic
= SHMAGIC
; /* Shared magic */
1719 internal_a
.magic
= NMAGIC
;/* Assume separate i/d */
1720 #define __A_MAGIC_SET__
1723 internal_a
.magic
= (magic
== I960ROMAGIC
? NMAGIC
: OMAGIC
);
1724 #define __A_MAGIC_SET__
1727 #define __A_MAGIC_SET__
1728 internal_a
.magic
= PAGEMAGICBCS
;
1732 #define __A_MAGIC_SET__
1733 internal_a
.magic
= APOLLO_COFF_VERSION_NUMBER
;
1737 #define __A_MAGIC_SET__
1738 /* Never was anything here for the 68k */
1739 #endif /* M68 || WE32K */
1742 #define __A_MAGIC_SET__
1743 internal_a
.magic
= ZMAGIC
;
1747 #define __A_MAGIC_SET__
1748 internal_a
.magic
= (abfd
->flags
& D_PAGED
) ? RS6K_AOUTHDR_ZMAGIC
:
1749 (abfd
->flags
& WP_TEXT
) ? RS6K_AOUTHDR_NMAGIC
:
1750 RS6K_AOUTHDR_OMAGIC
;
1753 #ifndef __A_MAGIC_SET__
1754 #include "Your aouthdr magic number is not being set!"
1756 #undef __A_MAGIC_SET__
1759 /* Now should write relocs, strings, syms */
1760 obj_sym_filepos (abfd
) = sym_base
;
1762 if (bfd_get_symcount (abfd
) != 0)
1764 #ifndef RS6000COFF_C
1765 if (!coff_add_missing_symbols (abfd
))
1768 if (!coff_renumber_symbols (abfd
))
1770 coff_mangle_symbols (abfd
);
1771 if (! coff_write_symbols (abfd
))
1773 if (!coff_write_linenumbers (abfd
))
1775 coff_write_relocs (abfd
);
1779 internal_a
.tsize
= bfd_get_section_size_before_reloc (text_sec
);
1780 internal_a
.text_start
= internal_a
.tsize
? text_sec
->vma
: 0;
1784 internal_a
.dsize
= bfd_get_section_size_before_reloc (data_sec
);
1785 internal_a
.data_start
= internal_a
.dsize
? data_sec
->vma
: 0;
1789 internal_a
.bsize
= bfd_get_section_size_before_reloc (bss_sec
);
1792 internal_a
.entry
= bfd_get_start_address (abfd
);
1793 internal_f
.f_nsyms
= bfd_get_symcount (abfd
);
1795 /* now write them */
1796 if (bfd_seek (abfd
, (file_ptr
) 0, SEEK_SET
) != 0)
1800 coff_swap_filehdr_out (abfd
, (PTR
) & internal_f
, (PTR
) & buff
);
1801 bfd_write ((PTR
) & buff
, 1, FILHSZ
, abfd
);
1803 if (abfd
->flags
& EXEC_P
)
1806 coff_swap_aouthdr_out (abfd
, (PTR
) & internal_a
, (PTR
) & buff
);
1807 bfd_write ((PTR
) & buff
, 1, AOUTSZ
, abfd
);
1813 coff_set_section_contents (abfd
, section
, location
, offset
, count
)
1818 bfd_size_type count
;
1820 if (abfd
->output_has_begun
== false) /* set by bfd.c handler */
1821 coff_compute_section_file_positions (abfd
);
1824 /* If this is a .lib section, bump the vma address so that it
1825 winds up being the number of .lib sections output. This is
1826 right for SVR3.2. Shared libraries should probably get more
1827 generic support. Ian Taylor <ian@cygnus.com>. */
1828 if (strcmp (section
->name
, _LIB
) == 0)
1832 /* Don't write out bss sections - one way to do this is to
1833 see if the filepos has not been set. */
1834 if (section
->filepos
== 0)
1837 bfd_seek (abfd
, (file_ptr
) (section
->filepos
+ offset
), SEEK_SET
);
1841 return (bfd_write (location
, 1, count
, abfd
) == count
) ? true : false;
1847 coff_close_and_cleanup (abfd
)
1850 if (!bfd_read_p (abfd
))
1851 switch (abfd
->format
)
1854 if (!_bfd_write_archive_contents (abfd
))
1858 if (!coff_write_object_contents (abfd
))
1862 bfd_set_error (bfd_error_invalid_operation
);
1866 /* We depend on bfd_close to free all the memory on the obstack. */
1867 /* FIXME if bfd_release is not using obstacks! */
1874 buy_and_read (abfd
, where
, seek_direction
, size
)
1880 PTR area
= (PTR
) bfd_alloc (abfd
, size
);
1883 bfd_set_error (bfd_error_no_memory
);
1886 bfd_seek (abfd
, where
, seek_direction
);
1887 if (bfd_read (area
, 1, size
, abfd
) != size
)
1889 bfd_set_error (bfd_error_system_call
);
1893 } /* buy_and_read() */
1899 Creating the linenumber table is done by reading in the entire
1900 coff linenumber table, and creating another table for internal use.
1902 A coff linenumber table is structured so that each function
1903 is marked as having a line number of 0. Each line within the
1904 function is an offset from the first line in the function. The
1905 base of the line number information for the table is stored in
1906 the symbol associated with the function.
1908 The information is copied from the external to the internal
1909 table, and each symbol which marks a function is marked by
1912 How does this work ?
1917 coff_slurp_line_table (abfd
, asect
)
1921 LINENO
*native_lineno
;
1922 alent
*lineno_cache
;
1924 BFD_ASSERT (asect
->lineno
== (alent
*) NULL
);
1926 native_lineno
= (LINENO
*) buy_and_read (abfd
,
1927 asect
->line_filepos
,
1930 asect
->lineno_count
));
1932 (alent
*) bfd_alloc (abfd
, (size_t) ((asect
->lineno_count
+ 1) * sizeof (alent
)));
1933 if (lineno_cache
== NULL
)
1935 bfd_set_error (bfd_error_no_memory
);
1940 unsigned int counter
= 0;
1941 alent
*cache_ptr
= lineno_cache
;
1942 LINENO
*src
= native_lineno
;
1944 while (counter
< asect
->lineno_count
)
1946 struct internal_lineno dst
;
1947 coff_swap_lineno_in (abfd
, src
, &dst
);
1948 cache_ptr
->line_number
= dst
.l_lnno
;
1950 if (cache_ptr
->line_number
== 0)
1952 coff_symbol_type
*sym
=
1953 (coff_symbol_type
*) (dst
.l_addr
.l_symndx
1954 + obj_raw_syments (abfd
))->u
.syment
._n
._n_n
._n_zeroes
;
1955 cache_ptr
->u
.sym
= (asymbol
*) sym
;
1956 sym
->lineno
= cache_ptr
;
1960 cache_ptr
->u
.offset
= dst
.l_addr
.l_paddr
1961 - bfd_section_vma (abfd
, asect
);
1962 } /* If no linenumber expect a symbol index */
1968 cache_ptr
->line_number
= 0;
1971 asect
->lineno
= lineno_cache
;
1972 /* FIXME, free native_lineno here, or use alloca or something. */
1977 coff_slurp_symbol_table (abfd
)
1980 combined_entry_type
*native_symbols
;
1981 coff_symbol_type
*cached_area
;
1982 unsigned int *table_ptr
;
1984 unsigned int number_of_symbols
= 0;
1985 if (obj_symbols (abfd
))
1987 bfd_seek (abfd
, obj_sym_filepos (abfd
), SEEK_SET
);
1989 /* Read in the symbol table */
1990 if ((native_symbols
= coff_get_normalized_symtab (abfd
)) == NULL
)
1995 /* Allocate enough room for all the symbols in cached form */
1997 (coff_symbol_type
*)
1998 bfd_alloc (abfd
, (size_t) (bfd_get_symcount (abfd
) * sizeof (coff_symbol_type
)));
2000 if (cached_area
== NULL
)
2002 bfd_set_error (bfd_error_no_memory
);
2007 bfd_alloc (abfd
, (size_t) (bfd_get_symcount (abfd
) * sizeof (unsigned int)));
2009 if (table_ptr
== NULL
)
2011 bfd_set_error (bfd_error_no_memory
);
2016 coff_symbol_type
*dst
= cached_area
;
2017 unsigned int last_native_index
= bfd_get_symcount (abfd
);
2018 unsigned int this_index
= 0;
2019 while (this_index
< last_native_index
)
2021 combined_entry_type
*src
= native_symbols
+ this_index
;
2022 table_ptr
[this_index
] = number_of_symbols
;
2023 dst
->symbol
.the_bfd
= abfd
;
2025 dst
->symbol
.name
= (char *) (src
->u
.syment
._n
._n_n
._n_offset
);
2026 /* We use the native name field to point to the cached field. */
2027 src
->u
.syment
._n
._n_n
._n_zeroes
= (long) dst
;
2028 dst
->symbol
.section
= coff_section_from_bfd_index (abfd
,
2029 src
->u
.syment
.n_scnum
);
2030 dst
->symbol
.flags
= 0;
2031 dst
->done_lineno
= false;
2033 switch (src
->u
.syment
.n_sclass
)
2038 dst
->symbol
.value
= src
->u
.syment
.n_value
- dst
->symbol
.section
->vma
;
2039 dst
->symbol
.flags
= BSF_EXPORT
| BSF_GLOBAL
;
2040 dst
->symbol
.flags
|= BSF_NOT_AT_END
;
2042 /* Fall through to next case */
2050 if ((src
->u
.syment
.n_scnum
) == 0)
2052 if ((src
->u
.syment
.n_value
) == 0)
2054 dst
->symbol
.section
= &bfd_und_section
;
2055 dst
->symbol
.value
= 0;
2059 dst
->symbol
.section
= &bfd_com_section
;
2060 dst
->symbol
.value
= (src
->u
.syment
.n_value
);
2066 Base the value as an index from the base of the
2070 dst
->symbol
.flags
= BSF_EXPORT
| BSF_GLOBAL
;
2071 dst
->symbol
.value
= src
->u
.syment
.n_value
- dst
->symbol
.section
->vma
;
2073 if (ISFCN ((src
->u
.syment
.n_type
)))
2076 A function ext does not go at the end of a file
2078 dst
->symbol
.flags
|= BSF_NOT_AT_END
;
2083 /* If this symbol has a csect aux of type LD, the scnlen field
2084 is actually the index of the containing csect symbol. We
2085 need to pointerize it. */
2086 if (src
->u
.syment
.n_numaux
> 0)
2088 combined_entry_type
*aux
;
2090 aux
= src
+ src
->u
.syment
.n_numaux
- 1;
2091 if (SMTYP_SMTYP (aux
->u
.auxent
.x_csect
.x_smtyp
) == XTY_LD
)
2093 aux
->u
.auxent
.x_csect
.x_scnlen
.p
=
2094 native_symbols
+ aux
->u
.auxent
.x_csect
.x_scnlen
.l
;
2095 aux
->fix_scnlen
= 1;
2102 case C_STAT
: /* static */
2104 case C_LEAFSTAT
: /* static leaf procedure */
2106 case C_LABEL
: /* label */
2107 if (src
->u
.syment
.n_scnum
== -2)
2108 dst
->symbol
.flags
= BSF_DEBUGGING
;
2110 dst
->symbol
.flags
= BSF_LOCAL
;
2112 Base the value as an index from the base of the section, if
2115 if (dst
->symbol
.section
)
2116 dst
->symbol
.value
= (src
->u
.syment
.n_value
) -
2117 dst
->symbol
.section
->vma
;
2119 dst
->symbol
.value
= (src
->u
.syment
.n_value
);
2122 case C_MOS
: /* member of structure */
2123 case C_EOS
: /* end of structure */
2124 #ifdef NOTDEF /* C_AUTOARG has the same value */
2126 case C_GLBLREG
: /* A29k-specific storage class */
2129 case C_REGPARM
: /* register parameter */
2130 case C_REG
: /* register variable */
2132 case C_AUTOARG
: /* 960-specific storage class */
2134 case C_TPDEF
: /* type definition */
2136 case C_AUTO
: /* automatic variable */
2137 case C_FIELD
: /* bit field */
2138 case C_ENTAG
: /* enumeration tag */
2139 case C_MOE
: /* member of enumeration */
2140 case C_MOU
: /* member of union */
2141 case C_UNTAG
: /* union tag */
2142 dst
->symbol
.flags
= BSF_DEBUGGING
;
2143 dst
->symbol
.value
= (src
->u
.syment
.n_value
);
2146 case C_FILE
: /* file name */
2147 case C_STRTAG
: /* structure tag */
2149 case C_BINCL
: /* beginning of include file */
2150 case C_EINCL
: /* ending of include file */
2162 dst
->symbol
.flags
= BSF_DEBUGGING
;
2163 dst
->symbol
.value
= (src
->u
.syment
.n_value
);
2168 dst
->symbol
.flags
= BSF_DEBUGGING
;
2169 dst
->symbol
.value
= src
->u
.syment
.n_value
;
2171 /* The value is actually a symbol index. Save a pointer to
2172 the symbol instead of the index. FIXME: This should use a
2174 src
->u
.syment
.n_value
=
2175 (long) (native_symbols
+ src
->u
.syment
.n_value
);
2180 case C_BLOCK
: /* ".bb" or ".eb" */
2181 case C_FCN
: /* ".bf" or ".ef" */
2182 case C_EFCN
: /* physical end of function */
2183 dst
->symbol
.flags
= BSF_LOCAL
;
2185 Base the value as an index from the base of the section
2187 dst
->symbol
.value
= (src
->u
.syment
.n_value
) - dst
->symbol
.section
->vma
;
2191 case C_EXTDEF
: /* external definition */
2192 case C_ULABEL
: /* undefined label */
2193 case C_USTATIC
: /* undefined static */
2194 case C_LINE
: /* line # reformatted as symbol table entry */
2195 case C_ALIAS
: /* duplicate tag */
2196 case C_HIDDEN
: /* ext symbol in dmert public lib */
2199 fprintf (stderr
, "Unrecognized storage class %d (assuming debugging)\n for %s symbol `%s'\n",
2200 src
->u
.syment
.n_sclass
, dst
->symbol
.section
->name
,
2203 dst
->symbol
.flags
= BSF_DEBUGGING
;
2204 dst
->symbol
.value
= (src
->u
.syment
.n_value
);
2208 /* BFD_ASSERT(dst->symbol.flags != 0);*/
2212 dst
->symbol
.udata
= 0;
2213 dst
->lineno
= (alent
*) NULL
;
2214 this_index
+= (src
->u
.syment
.n_numaux
) + 1;
2216 number_of_symbols
++;
2217 } /* walk the native symtab */
2218 } /* bfdize the native symtab */
2220 obj_symbols (abfd
) = cached_area
;
2221 obj_raw_syments (abfd
) = native_symbols
;
2223 obj_conv_table_size (abfd
) = bfd_get_symcount (abfd
);
2224 bfd_get_symcount (abfd
) = number_of_symbols
;
2225 obj_convert (abfd
) = table_ptr
;
2226 /* Slurp the line tables for each section too */
2232 coff_slurp_line_table (abfd
, p
);
2237 } /* coff_slurp_symbol_table() */
2243 Coff relocations are easily transformed into the internal BFD form
2246 Reading a coff relocation table is done in the following stages:
2248 o Read the entire coff relocation table into memory.
2250 o Process each relocation in turn; first swap it from the
2251 external to the internal form.
2253 o Turn the symbol referenced in the relocation's symbol index
2254 into a pointer into the canonical symbol table.
2255 This table is the same as the one returned by a call to
2256 @code{bfd_canonicalize_symtab}. The back end will call that
2257 routine and save the result if a canonicalization hasn't been done.
2259 o The reloc index is turned into a pointer to a howto
2260 structure, in a back end specific way. For instance, the 386
2261 and 960 use the @code{r_type} to directly produce an index
2262 into a howto table vector; the 88k subtracts a number from the
2263 @code{r_type} field and creates an addend field.
2269 #define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
2270 if (ptr && bfd_asymbol_bfd(ptr) == abfd \
2271 && !bfd_is_com_section(ptr->section) \
2272 && !(ptr->flags & BSF_OLD_COMMON)) \
2274 cache_ptr->addend = -(ptr->section->vma + ptr->value); \
2277 cache_ptr->addend = 0; \
2282 coff_slurp_reloc_table (abfd
, asect
, symbols
)
2287 RELOC
*native_relocs
;
2288 arelent
*reloc_cache
;
2293 if (asect
->relocation
)
2295 if (asect
->reloc_count
== 0)
2297 if (asect
->flags
& SEC_CONSTRUCTOR
)
2299 if (!coff_slurp_symbol_table (abfd
))
2302 (RELOC
*) buy_and_read (abfd
,
2306 asect
->reloc_count
));
2307 reloc_cache
= (arelent
*)
2308 bfd_alloc (abfd
, (size_t) (asect
->reloc_count
* sizeof (arelent
)));
2310 if (reloc_cache
== NULL
)
2312 bfd_set_error (bfd_error_no_memory
);
2317 for (idx
= 0; idx
< asect
->reloc_count
; idx
++)
2319 #ifdef RELOC_PROCESSING
2320 struct internal_reloc dst
;
2321 struct external_reloc
*src
;
2323 cache_ptr
= reloc_cache
+ idx
;
2324 src
= native_relocs
+ idx
;
2325 bfd_swap_reloc_in (abfd
, src
, &dst
);
2327 RELOC_PROCESSING (cache_ptr
, &dst
, symbols
, abfd
, asect
);
2329 struct internal_reloc dst
;
2331 struct external_reloc
*src
;
2333 cache_ptr
= reloc_cache
+ idx
;
2334 src
= native_relocs
+ idx
;
2336 bfd_swap_reloc_in (abfd
, src
, &dst
);
2339 cache_ptr
->address
= dst
.r_vaddr
;
2341 if (dst
.r_symndx
!= -1)
2343 /* @@ Should never be greater than count of symbols! */
2344 if (dst
.r_symndx
>= obj_conv_table_size (abfd
))
2346 cache_ptr
->sym_ptr_ptr
= symbols
+ obj_convert (abfd
)[dst
.r_symndx
];
2347 ptr
= *(cache_ptr
->sym_ptr_ptr
);
2351 cache_ptr
->sym_ptr_ptr
= bfd_abs_section
.symbol_ptr_ptr
;
2355 /* The symbols definitions that we have read in have been
2356 relocated as if their sections started at 0. But the offsets
2357 refering to the symbols in the raw data have not been
2358 modified, so we have to have a negative addend to compensate.
2360 Note that symbols which used to be common must be left alone */
2362 /* Calculate any reloc addend by looking at the symbol */
2363 CALC_ADDEND (abfd
, ptr
, dst
, cache_ptr
);
2365 cache_ptr
->address
-= asect
->vma
;
2366 /* !! cache_ptr->section = (asection *) NULL;*/
2368 /* Fill in the cache_ptr->howto field from dst.r_type */
2369 RTYPE2HOWTO (cache_ptr
, &dst
);
2374 asect
->relocation
= reloc_cache
;
2379 /* This is stupid. This function should be a boolean predicate. */
2381 coff_canonicalize_reloc (abfd
, section
, relptr
, symbols
)
2387 arelent
*tblptr
= section
->relocation
;
2388 unsigned int count
= 0;
2391 if (section
->flags
& SEC_CONSTRUCTOR
)
2393 /* this section has relocs made up by us, they are not in the
2394 file, so take them out of their chain and place them into
2395 the data area provided */
2396 arelent_chain
*chain
= section
->constructor_chain
;
2397 for (count
= 0; count
< section
->reloc_count
; count
++)
2399 *relptr
++ = &chain
->relent
;
2400 chain
= chain
->next
;
2406 if (! coff_slurp_reloc_table (abfd
, section
, symbols
))
2409 tblptr
= section
->relocation
;
2413 for (; count
++ < section
->reloc_count
;)
2414 *relptr
++ = tblptr
++;
2419 return section
->reloc_count
;
2424 coff_sym_filepos (abfd
)
2427 return obj_sym_filepos (abfd
);
2431 #ifndef coff_reloc16_estimate
2432 #define coff_reloc16_estimate dummy_reloc16_estimate
2435 dummy_reloc16_estimate (abfd
, input_section
, reloc
, shrink
, link_info
)
2437 asection
*input_section
;
2439 unsigned int shrink
;
2440 struct bfd_link_info
*link_info
;
2447 #ifndef coff_reloc16_extra_cases
2448 #define coff_reloc16_extra_cases dummy_reloc16_extra_cases
2449 /* This works even if abort is not declared in any header file. */
2451 dummy_reloc16_extra_cases (abfd
, link_info
, link_order
, reloc
, data
, src_ptr
,
2454 struct bfd_link_info
*link_info
;
2455 struct bfd_link_order
*link_order
;
2458 unsigned int *src_ptr
;
2459 unsigned int *dst_ptr
;
2461 fprintf (stderr
, "%s\n", reloc
->howto
->name
);
2466 static CONST bfd_coff_backend_data bfd_coff_std_swap_table
=
2468 coff_swap_aux_in
, coff_swap_sym_in
, coff_swap_lineno_in
,
2469 coff_swap_aux_out
, coff_swap_sym_out
,
2470 coff_swap_lineno_out
, coff_swap_reloc_out
,
2471 coff_swap_filehdr_out
, coff_swap_aouthdr_out
,
2472 coff_swap_scnhdr_out
,
2473 FILHSZ
, AOUTSZ
, SCNHSZ
, SYMESZ
, AUXESZ
, LINESZ
,
2474 #ifdef COFF_LONG_FILENAMES
2479 coff_swap_filehdr_in
, coff_swap_aouthdr_in
, coff_swap_scnhdr_in
,
2480 coff_bad_format_hook
, coff_set_arch_mach_hook
, coff_mkobject_hook
,
2481 styp_to_sec_flags
, coff_make_section_hook
, coff_set_alignment_hook
,
2482 coff_slurp_symbol_table
, symname_in_debug_hook
,
2483 coff_reloc16_extra_cases
, coff_reloc16_estimate
2486 #define coff_core_file_failing_command _bfd_dummy_core_file_failing_command
2487 #define coff_core_file_failing_signal _bfd_dummy_core_file_failing_signal
2488 #define coff_core_file_matches_executable_p _bfd_dummy_core_file_matches_executable_p
2489 #define coff_slurp_armap bfd_slurp_coff_armap
2490 #define coff_slurp_extended_name_table _bfd_slurp_extended_name_table
2491 #define coff_truncate_arname bfd_dont_truncate_arname
2492 #define coff_openr_next_archived_file bfd_generic_openr_next_archived_file
2493 #define coff_generic_stat_arch_elt bfd_generic_stat_arch_elt
2494 #define coff_get_section_contents bfd_generic_get_section_contents
2495 #define coff_close_and_cleanup bfd_generic_close_and_cleanup
2497 #define coff_bfd_debug_info_start bfd_void
2498 #define coff_bfd_debug_info_end bfd_void
2499 #define coff_bfd_debug_info_accumulate \
2500 (void (*) PARAMS ((bfd *, struct sec *))) bfd_void
2501 #define coff_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
2502 #define coff_bfd_relax_section bfd_generic_relax_section
2503 #ifndef coff_bfd_reloc_type_lookup
2504 #define coff_bfd_reloc_type_lookup \
2505 ((CONST struct reloc_howto_struct *(*) PARAMS ((bfd *, bfd_reloc_code_real_type))) bfd_nullvoidptr)
2507 #define coff_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
2508 #define coff_bfd_link_add_symbols _bfd_generic_link_add_symbols
2509 #define coff_bfd_final_link _bfd_generic_final_link
2511 #ifndef coff_bfd_copy_private_section_data
2512 #define coff_bfd_copy_private_section_data \
2513 ((boolean (*) PARAMS ((bfd *, asection *, bfd *, asection *))) bfd_true)
2515 #ifndef coff_bfd_copy_private_bfd_data
2516 #define coff_bfd_copy_private_bfd_data \
2517 ((boolean (*) PARAMS ((bfd *, bfd *))) bfd_true)
2519 #ifndef coff_bfd_is_local_label
2520 #define coff_bfd_is_local_label bfd_generic_is_local_label