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
| SEC_COFF_SHARED_LIBRARY
)) != 0)
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_COFF_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_COFF_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_COFF_SHARED_LIBRARY
;
446 sec_flags
|= SEC_ALLOC
;
448 else if (styp_flags
& STYP_INFO
)
450 /* We mark these as SEC_DEBUGGING, but only if COFF_PAGE_SIZE is
451 defined. coff_compute_section_file_positions uses
452 COFF_PAGE_SIZE to ensure that the low order bits of the
453 section VMA and the file offset match. If we don't know
454 COFF_PAGE_SIZE, we can't ensure the correct correspondence,
455 and demand page loading of the file will fail. */
456 #ifdef COFF_PAGE_SIZE
457 sec_flags
|= SEC_DEBUGGING
;
462 sec_flags
|= SEC_ALLOC
| SEC_LOAD
;
465 #ifdef STYP_LIT /* A29k readonly text/data section type */
466 if ((styp_flags
& STYP_LIT
) == STYP_LIT
)
468 sec_flags
= (SEC_LOAD
| SEC_ALLOC
| SEC_READONLY
);
470 #endif /* STYP_LIT */
471 #ifdef STYP_OTHER_LOAD /* Other loaded sections */
472 if (styp_flags
& STYP_OTHER_LOAD
)
474 sec_flags
= (SEC_LOAD
| SEC_ALLOC
);
476 #endif /* STYP_SDATA */
481 #define get_index(symbol) ((long) (symbol)->udata)
485 bfd_coff_backend_data
489 Special entry points for gdb to swap in coff symbol table parts:
492 . void (*_bfd_coff_swap_aux_in) PARAMS ((
501 . void (*_bfd_coff_swap_sym_in) PARAMS ((
506 . void (*_bfd_coff_swap_lineno_in) PARAMS ((
512 Special entry points for gas to swap out coff parts:
514 . unsigned int (*_bfd_coff_swap_aux_out) PARAMS ((
523 . unsigned int (*_bfd_coff_swap_sym_out) PARAMS ((
528 . unsigned int (*_bfd_coff_swap_lineno_out) PARAMS ((
533 . unsigned int (*_bfd_coff_swap_reloc_out) PARAMS ((
538 . unsigned int (*_bfd_coff_swap_filehdr_out) PARAMS ((
543 . unsigned int (*_bfd_coff_swap_aouthdr_out) PARAMS ((
548 . unsigned int (*_bfd_coff_swap_scnhdr_out) PARAMS ((
554 Special entry points for generic COFF routines to call target
555 dependent COFF routines:
557 . unsigned int _bfd_filhsz;
558 . unsigned int _bfd_aoutsz;
559 . unsigned int _bfd_scnhsz;
560 . unsigned int _bfd_symesz;
561 . unsigned int _bfd_auxesz;
562 . unsigned int _bfd_linesz;
563 . boolean _bfd_coff_long_filenames;
564 . void (*_bfd_coff_swap_filehdr_in) PARAMS ((
568 . void (*_bfd_coff_swap_aouthdr_in) PARAMS ((
572 . void (*_bfd_coff_swap_scnhdr_in) PARAMS ((
576 . boolean (*_bfd_coff_bad_format_hook) PARAMS ((
578 . PTR internal_filehdr));
579 . boolean (*_bfd_coff_set_arch_mach_hook) PARAMS ((
581 . PTR internal_filehdr));
582 . PTR (*_bfd_coff_mkobject_hook) PARAMS ((
584 . PTR internal_filehdr,
585 . PTR internal_aouthdr));
586 . flagword (*_bfd_styp_to_sec_flags_hook) PARAMS ((
588 . PTR internal_scnhdr));
589 . asection *(*_bfd_make_section_hook) PARAMS ((
592 . void (*_bfd_set_alignment_hook) PARAMS ((
595 . PTR internal_scnhdr));
596 . boolean (*_bfd_coff_slurp_symbol_table) PARAMS ((
598 . boolean (*_bfd_coff_symname_in_debug) PARAMS ((
600 . struct internal_syment *sym));
601 . void (*_bfd_coff_reloc16_extra_cases) PARAMS ((
603 . struct bfd_link_info *link_info,
604 . struct bfd_link_order *link_order,
607 . unsigned int *src_ptr,
608 . unsigned int *dst_ptr));
609 . int (*_bfd_coff_reloc16_estimate) PARAMS ((
611 . asection *input_section,
613 . unsigned int shrink,
614 . struct bfd_link_info *link_info));
616 .} bfd_coff_backend_data;
618 .#define coff_backend_info(abfd) ((bfd_coff_backend_data *) (abfd)->xvec->backend_data)
620 .#define bfd_coff_swap_aux_in(a,e,t,c,ind,num,i) \
621 . ((coff_backend_info (a)->_bfd_coff_swap_aux_in) (a,e,t,c,ind,num,i))
623 .#define bfd_coff_swap_sym_in(a,e,i) \
624 . ((coff_backend_info (a)->_bfd_coff_swap_sym_in) (a,e,i))
626 .#define bfd_coff_swap_lineno_in(a,e,i) \
627 . ((coff_backend_info ( a)->_bfd_coff_swap_lineno_in) (a,e,i))
629 .#define bfd_coff_swap_reloc_out(abfd, i, o) \
630 . ((coff_backend_info (abfd)->_bfd_coff_swap_reloc_out) (abfd, i, o))
632 .#define bfd_coff_swap_lineno_out(abfd, i, o) \
633 . ((coff_backend_info (abfd)->_bfd_coff_swap_lineno_out) (abfd, i, o))
635 .#define bfd_coff_swap_aux_out(a,i,t,c,ind,num,o) \
636 . ((coff_backend_info (a)->_bfd_coff_swap_aux_out) (a,i,t,c,ind,num,o))
638 .#define bfd_coff_swap_sym_out(abfd, i,o) \
639 . ((coff_backend_info (abfd)->_bfd_coff_swap_sym_out) (abfd, i, o))
641 .#define bfd_coff_swap_scnhdr_out(abfd, i,o) \
642 . ((coff_backend_info (abfd)->_bfd_coff_swap_scnhdr_out) (abfd, i, o))
644 .#define bfd_coff_swap_filehdr_out(abfd, i,o) \
645 . ((coff_backend_info (abfd)->_bfd_coff_swap_filehdr_out) (abfd, i, o))
647 .#define bfd_coff_swap_aouthdr_out(abfd, i,o) \
648 . ((coff_backend_info (abfd)->_bfd_coff_swap_aouthdr_out) (abfd, i, o))
650 .#define bfd_coff_filhsz(abfd) (coff_backend_info (abfd)->_bfd_filhsz)
651 .#define bfd_coff_aoutsz(abfd) (coff_backend_info (abfd)->_bfd_aoutsz)
652 .#define bfd_coff_scnhsz(abfd) (coff_backend_info (abfd)->_bfd_scnhsz)
653 .#define bfd_coff_symesz(abfd) (coff_backend_info (abfd)->_bfd_symesz)
654 .#define bfd_coff_auxesz(abfd) (coff_backend_info (abfd)->_bfd_auxesz)
655 .#define bfd_coff_linesz(abfd) (coff_backend_info (abfd)->_bfd_linesz)
656 .#define bfd_coff_long_filenames(abfd) (coff_backend_info (abfd)->_bfd_coff_long_filenames)
657 .#define bfd_coff_swap_filehdr_in(abfd, i,o) \
658 . ((coff_backend_info (abfd)->_bfd_coff_swap_filehdr_in) (abfd, i, o))
660 .#define bfd_coff_swap_aouthdr_in(abfd, i,o) \
661 . ((coff_backend_info (abfd)->_bfd_coff_swap_aouthdr_in) (abfd, i, o))
663 .#define bfd_coff_swap_scnhdr_in(abfd, i,o) \
664 . ((coff_backend_info (abfd)->_bfd_coff_swap_scnhdr_in) (abfd, i, o))
666 .#define bfd_coff_bad_format_hook(abfd, filehdr) \
667 . ((coff_backend_info (abfd)->_bfd_coff_bad_format_hook) (abfd, filehdr))
669 .#define bfd_coff_set_arch_mach_hook(abfd, filehdr)\
670 . ((coff_backend_info (abfd)->_bfd_coff_set_arch_mach_hook) (abfd, filehdr))
671 .#define bfd_coff_mkobject_hook(abfd, filehdr, aouthdr)\
672 . ((coff_backend_info (abfd)->_bfd_coff_mkobject_hook) (abfd, filehdr, aouthdr))
674 .#define bfd_coff_styp_to_sec_flags_hook(abfd, scnhdr)\
675 . ((coff_backend_info (abfd)->_bfd_styp_to_sec_flags_hook) (abfd, scnhdr))
677 .#define bfd_coff_make_section_hook(abfd, name)\
678 . ((coff_backend_info (abfd)->_bfd_make_section_hook) (abfd, name))
680 .#define bfd_coff_set_alignment_hook(abfd, sec, scnhdr)\
681 . ((coff_backend_info (abfd)->_bfd_set_alignment_hook) (abfd, sec, scnhdr))
683 .#define bfd_coff_slurp_symbol_table(abfd)\
684 . ((coff_backend_info (abfd)->_bfd_coff_slurp_symbol_table) (abfd))
686 .#define bfd_coff_symname_in_debug(abfd, sym)\
687 . ((coff_backend_info (abfd)->_bfd_coff_symname_in_debug) (abfd, sym))
689 .#define bfd_coff_reloc16_extra_cases(abfd, link_info, link_order, reloc, data, src_ptr, dst_ptr)\
690 . ((coff_backend_info (abfd)->_bfd_coff_reloc16_extra_cases)\
691 . (abfd, link_info, link_order, reloc, data, src_ptr, dst_ptr))
693 .#define bfd_coff_reloc16_estimate(abfd, section, reloc, shrink, link_info)\
694 . ((coff_backend_info (abfd)->_bfd_coff_reloc16_estimate)\
695 . (abfd, section, reloc, shrink, link_info))
699 /* See whether the magic number matches. */
702 coff_bad_format_hook (abfd
, filehdr
)
706 struct internal_filehdr
*internal_f
= (struct internal_filehdr
*) filehdr
;
708 if (BADMAG (*internal_f
))
711 /* if the optional header is NULL or not the correct size then
712 quit; the only difference I can see between m88k dgux headers (MC88DMAGIC)
713 and Intel 960 readwrite headers (I960WRMAGIC) is that the
714 optional header is of a different size.
716 But the mips keeps extra stuff in it's opthdr, so dont check
720 #if defined(M88) || defined(I960)
721 if (internal_f
->f_opthdr
!= 0 && AOUTSZ
!= internal_f
->f_opthdr
)
729 coff_make_section_hook (abfd
, name
)
734 /* FIXME: This predates the call to bfd_make_section_anyway
735 in make_a_section_from_file, and can probably go away. */
736 /* On SCO a file created by the Microsoft assembler can have two
737 .data sections. We use .data2 for the second one. */
738 if (strcmp (name
, _DATA
) == 0)
739 return bfd_make_section (abfd
, ".data2");
741 return (asection
*) NULL
;
745 initialize a section structure with information peculiar to this
746 particular implementation of coff
750 coff_new_section_hook (abfd
, section
)
754 section
->alignment_power
= abfd
->xvec
->align_power_min
;
755 /* Allocate aux records for section symbols, to store size and
758 @@ Shouldn't use constant multiplier here! */
759 coffsymbol (section
->symbol
)->native
=
760 (combined_entry_type
*) bfd_zalloc (abfd
,
761 sizeof (combined_entry_type
) * 10);
764 /* This is to allow double-word operations on addresses in data or bss. */
765 if (strcmp (section
->name
, ".data") == 0
766 || strcmp (section
->name
, ".bss") == 0)
767 section
->alignment_power
= 3;
768 #endif /* COFF_SPARC */
776 /* Set the alignment of a BFD section. */
779 coff_set_alignment_hook (abfd
, section
, scnhdr
)
784 struct internal_scnhdr
*hdr
= (struct internal_scnhdr
*) scnhdr
;
787 for (i
= 0; i
< 32; i
++)
788 if ((1 << i
) >= hdr
->s_align
)
790 section
->alignment_power
= i
;
795 #define coff_set_alignment_hook \
796 ((void (*) PARAMS ((bfd *, asection *, PTR))) bfd_void)
804 coff_data_type
*coff
;
806 abfd
->tdata
.coff_obj_data
= (struct coff_tdata
*) bfd_zalloc (abfd
, sizeof (coff_data_type
));
807 if (abfd
->tdata
.coff_obj_data
== 0)
809 bfd_set_error (bfd_error_no_memory
);
812 coff
= coff_data (abfd
);
813 coff
->symbols
= (coff_symbol_type
*) NULL
;
814 coff
->conversion_table
= (unsigned int *) NULL
;
815 coff
->raw_syments
= (struct coff_ptr_struct
*) NULL
;
816 coff
->raw_linenos
= (struct lineno
*) NULL
;
818 /* make_abs_section(abfd);*/
822 /* Create the COFF backend specific information. */
825 coff_mkobject_hook (abfd
, filehdr
, aouthdr
)
830 struct internal_filehdr
*internal_f
= (struct internal_filehdr
*) filehdr
;
831 coff_data_type
*coff
;
833 if (coff_mkobject (abfd
) == false)
836 coff
= coff_data (abfd
);
838 coff
->sym_filepos
= internal_f
->f_symptr
;
839 coff
->flags
= internal_f
->f_flags
;
841 /* These members communicate important constants about the symbol
842 table to GDB's symbol-reading code. These `constants'
843 unfortunately vary among coff implementations... */
844 coff
->local_n_btmask
= N_BTMASK
;
845 coff
->local_n_btshft
= N_BTSHFT
;
846 coff
->local_n_tmask
= N_TMASK
;
847 coff
->local_n_tshift
= N_TSHIFT
;
848 coff
->local_symesz
= SYMESZ
;
849 coff
->local_auxesz
= AUXESZ
;
850 coff
->local_linesz
= LINESZ
;
855 /* Determine the machine architecture and type. FIXME: This is target
856 dependent because the magic numbers are defined in the target
857 dependent header files. But there is no particular need for this.
858 If the magic numbers were moved to a separate file, this function
859 would be target independent and would also be much more successful
860 at linking together COFF files for different architectures. */
863 coff_set_arch_mach_hook (abfd
, filehdr
)
868 enum bfd_architecture arch
;
869 struct internal_filehdr
*internal_f
= (struct internal_filehdr
*) filehdr
;
872 switch (internal_f
->f_magic
)
877 case I386AIXMAGIC
: /* Danbury PS/2 AIX C Compiler */
878 case LYNXCOFFMAGIC
: /* shadows the m68k Lynx number below, sigh */
879 arch
= bfd_arch_i386
;
884 #ifdef A29K_MAGIC_BIG
886 case A29K_MAGIC_LITTLE
:
887 arch
= bfd_arch_a29k
;
898 #ifdef APOLLOM68KMAGIC
899 case APOLLOM68KMAGIC
:
904 arch
= bfd_arch_m68k
;
912 arch
= bfd_arch_m88k
;
919 switch (internal_f
->f_flags
& F_MACHMASK
)
922 machine
= bfd_mach_z8001
;
925 machine
= bfd_mach_z8002
;
936 arch
= bfd_arch_i960
;
937 switch (F_I960TYPE
& internal_f
->f_flags
)
941 machine
= bfd_mach_i960_core
;
944 machine
= bfd_mach_i960_kb_sb
;
947 machine
= bfd_mach_i960_mc
;
950 machine
= bfd_mach_i960_xa
;
953 machine
= bfd_mach_i960_ca
;
956 machine
= bfd_mach_i960_ka_sa
;
958 /* start-sanitize-i960xl */
960 machine
= bfd_mach_i960_xl
;
962 /* end-sanitize-i960xl */
972 arch
= bfd_arch_rs6000
;
979 arch
= bfd_arch_we32k
;
986 arch
= bfd_arch_h8300
;
987 machine
= bfd_mach_h8300
;
988 /* !! FIXME this probably isn't the right place for this */
989 abfd
->flags
|= BFD_IS_RELAXABLE
;
995 arch
= bfd_arch_h8300
;
996 machine
= bfd_mach_h8300h
;
997 /* !! FIXME this probably isn't the right place for this */
998 abfd
->flags
|= BFD_IS_RELAXABLE
;
1002 #ifdef SH_ARCH_MAGIC
1011 arch
= bfd_arch_h8500
;
1018 #ifdef LYNXCOFFMAGIC
1021 arch
= bfd_arch_sparc
;
1026 default: /* Unreadable input file type */
1027 arch
= bfd_arch_obscure
;
1031 bfd_default_set_arch_mach (abfd
, arch
, machine
);
1035 #ifdef SYMNAME_IN_DEBUG
1038 symname_in_debug_hook (abfd
, sym
)
1040 struct internal_syment
*sym
;
1042 return SYMNAME_IN_DEBUG (sym
) ? true : false;
1047 #define symname_in_debug_hook \
1048 (boolean (*) PARAMS ((bfd *, struct internal_syment *))) bfd_false
1056 To write relocations, the back end steps though the
1057 canonical relocation table and create an
1058 @code{internal_reloc}. The symbol index to use is removed from
1059 the @code{offset} field in the symbol table supplied. The
1060 address comes directly from the sum of the section base
1061 address and the relocation offset; the type is dug directly
1062 from the howto field. Then the @code{internal_reloc} is
1063 swapped into the shape of an @code{external_reloc} and written
1069 coff_write_relocs (abfd
)
1073 for (s
= abfd
->sections
; s
!= (asection
*) NULL
; s
= s
->next
)
1076 struct external_reloc dst
;
1078 arelent
**p
= s
->orelocation
;
1079 if (bfd_seek (abfd
, s
->rel_filepos
, SEEK_SET
) != 0)
1081 for (i
= 0; i
< s
->reloc_count
; i
++)
1083 struct internal_reloc n
;
1085 memset ((PTR
) & n
, 0, sizeof (n
));
1087 n
.r_vaddr
= q
->address
+ s
->vma
;
1090 /* The 29k const/consth reloc pair is a real kludge. The consth
1091 part doesn't have a symbol; it has an offset. So rebuilt
1093 if (q
->howto
->type
== R_IHCONST
)
1094 n
.r_symndx
= q
->addend
;
1099 if (q
->sym_ptr_ptr
== bfd_abs_section_ptr
->symbol_ptr_ptr
)
1100 /* This is a relocation relative to the absolute symbol. */
1104 n
.r_symndx
= get_index ((*(q
->sym_ptr_ptr
)));
1105 /* Take notice if the symbol reloc points to a symbol
1106 we don't have in our symbol table. What should we
1108 if (n
.r_symndx
> obj_conv_table_size (abfd
))
1113 #ifdef SWAP_OUT_RELOC_OFFSET
1114 n
.r_offset
= q
->addend
;
1118 /* Work out reloc type from what is required */
1119 SELECT_RELOC (n
, q
->howto
);
1121 n
.r_type
= q
->howto
->type
;
1123 coff_swap_reloc_out (abfd
, &n
, &dst
);
1124 if (bfd_write ((PTR
) & dst
, 1, RELSZ
, abfd
) != RELSZ
)
1132 /* Set flags and magic number of a coff file from architecture and machine
1133 type. Result is true if we can represent the arch&type, false if not. */
1136 coff_set_flags (abfd
, magicp
, flagsp
)
1139 unsigned short *flagsp
;
1141 switch (bfd_get_arch (abfd
))
1146 switch (bfd_get_mach (abfd
))
1148 case bfd_mach_z8001
:
1151 case bfd_mach_z8002
:
1165 *magicp
= I960ROMAGIC
;
1167 ((bfd_get_file_flags(abfd) & WP_TEXT) ? I960ROMAGIC :
1168 I960RWMAGIC); FIXME???
1170 switch (bfd_get_mach (abfd
))
1172 case bfd_mach_i960_core
:
1175 case bfd_mach_i960_kb_sb
:
1178 case bfd_mach_i960_mc
:
1181 case bfd_mach_i960_xa
:
1184 case bfd_mach_i960_ca
:
1187 case bfd_mach_i960_ka_sa
:
1190 /* start-sanitize-i960xl */
1191 case bfd_mach_i960_xl
:
1194 /* end-sanitize-i960xl */
1205 *magicp
= I386MAGIC
;
1207 /* Just overwrite the usual value if we're doing Lynx. */
1208 *magicp
= LYNXCOFFMAGIC
;
1215 #ifdef APOLLOM68KMAGIC
1216 *magicp
= APOLLO_COFF_VERSION_NUMBER
;
1218 *magicp
= MC68MAGIC
;
1221 /* Just overwrite the usual value if we're doing Lynx. */
1222 *magicp
= LYNXCOFFMAGIC
;
1230 *magicp
= MC88OMAGIC
;
1235 case bfd_arch_h8300
:
1236 switch (bfd_get_mach (abfd
))
1238 case bfd_mach_h8300
:
1239 *magicp
= H8300MAGIC
;
1241 case bfd_mach_h8300h
:
1242 *magicp
= H8300HMAGIC
;
1248 #ifdef SH_ARCH_MAGIC
1250 *magicp
= SH_ARCH_MAGIC
;
1256 case bfd_arch_sparc
:
1257 *magicp
= SPARCMAGIC
;
1259 /* Just overwrite the usual value if we're doing Lynx. */
1260 *magicp
= LYNXCOFFMAGIC
;
1267 case bfd_arch_h8500
:
1268 *magicp
= H8500MAGIC
;
1272 #ifdef A29K_MAGIC_BIG
1274 if (abfd
->xvec
->byteorder_big_p
)
1275 *magicp
= A29K_MAGIC_BIG
;
1277 *magicp
= A29K_MAGIC_LITTLE
;
1283 case bfd_arch_we32k
:
1284 *magicp
= WE32KMAGIC
;
1290 case bfd_arch_rs6000
:
1291 case bfd_arch_powerpc
:
1292 *magicp
= U802TOCMAGIC
;
1297 default: /* Unknown architecture */
1298 /* return false; -- fall through to "return false" below, to avoid
1299 "statement never reached" errors on the one below. */
1308 coff_set_arch_mach (abfd
, arch
, machine
)
1310 enum bfd_architecture arch
;
1311 unsigned long machine
;
1314 unsigned short dummy2
;
1316 if (! bfd_default_set_arch_mach (abfd
, arch
, machine
))
1319 if (arch
!= bfd_arch_unknown
&&
1320 coff_set_flags (abfd
, &dummy1
, &dummy2
) != true)
1321 return false; /* We can't represent this type */
1323 return true; /* We're easy ... */
1327 /* Calculate the file position for each section. */
1330 coff_compute_section_file_positions (abfd
)
1334 asection
*previous
= (asection
*) NULL
;
1335 file_ptr sofar
= FILHSZ
;
1339 if (bfd_get_start_address (abfd
))
1341 /* A start address may have been added to the original file. In this
1342 case it will need an optional header to record it. */
1343 abfd
->flags
|= EXEC_P
;
1346 if (abfd
->flags
& EXEC_P
)
1349 sofar
+= abfd
->section_count
* SCNHSZ
;
1350 for (current
= abfd
->sections
;
1351 current
!= (asection
*) NULL
;
1352 current
= current
->next
)
1355 /* Only deal with sections which have contents */
1356 if (!(current
->flags
& SEC_HAS_CONTENTS
))
1359 /* Align the sections in the file to the same boundary on
1360 which they are aligned in virtual memory. I960 doesn't
1361 do this (FIXME) so we can stay in sync with Intel. 960
1362 doesn't yet page from files... */
1365 /* make sure this section is aligned on the right boundary - by
1366 padding the previous section up if necessary */
1369 sofar
= BFD_ALIGN (sofar
, 1 << current
->alignment_power
);
1370 if (previous
!= (asection
*) NULL
)
1372 previous
->_raw_size
+= sofar
- old_sofar
;
1378 #ifdef COFF_PAGE_SIZE
1379 /* In demand paged files the low order bits of the file offset
1380 must match the low order bits of the virtual address. */
1381 if ((abfd
->flags
& D_PAGED
) != 0)
1382 sofar
+= (current
->vma
- sofar
) % COFF_PAGE_SIZE
;
1385 current
->filepos
= sofar
;
1387 sofar
+= current
->_raw_size
;
1389 /* make sure that this section is of the right size too */
1391 sofar
= BFD_ALIGN (sofar
, 1 << current
->alignment_power
);
1392 current
->_raw_size
+= sofar
- old_sofar
;
1396 /* Force .lib sections to start at zero. The vma is then
1397 incremented in coff_set_section_contents. This is right for
1399 if (strcmp (current
->name
, _LIB
) == 0)
1400 bfd_set_section_vma (abfd
, current
, 0);
1405 obj_relocbase (abfd
) = sofar
;
1408 #ifndef RS6000COFF_C
1410 /* If .file, .text, .data, .bss symbols are missing, add them. */
1411 /* @@ Should we only be adding missing symbols, or overriding the aux
1412 values for existing section symbols? */
1414 coff_add_missing_symbols (abfd
)
1417 unsigned int nsyms
= bfd_get_symcount (abfd
);
1418 asymbol
**sympp
= abfd
->outsymbols
;
1421 int need_text
= 1, need_data
= 1, need_bss
= 1, need_file
= 1;
1423 for (i
= 0; i
< nsyms
; i
++)
1425 coff_symbol_type
*csym
= coff_symbol_from (abfd
, sympp
[i
]);
1429 /* only do this if there is a coff representation of the input
1431 if (csym
->native
&& csym
->native
->u
.syment
.n_sclass
== C_FILE
)
1436 name
= csym
->symbol
.name
;
1439 if (!strcmp (name
, _TEXT
))
1442 else if (!strcmp (name
, ".wtext"))
1445 else if (!strcmp (name
, _DATA
))
1447 else if (!strcmp (name
, _BSS
))
1451 /* Now i == bfd_get_symcount (abfd). */
1452 /* @@ For now, don't deal with .file symbol. */
1455 if (!need_text
&& !need_data
&& !need_bss
&& !need_file
)
1457 nsyms
+= need_text
+ need_data
+ need_bss
+ need_file
;
1458 sympp2
= (asymbol
**) bfd_alloc_by_size_t (abfd
, nsyms
* sizeof (asymbol
*));
1461 bfd_set_error (bfd_error_no_memory
);
1464 memcpy (sympp2
, sympp
, i
* sizeof (asymbol
*));
1467 /* @@ Generate fake .file symbol, in sympp2[i], and increment i. */
1471 sympp2
[i
++] = coff_section_symbol (abfd
, _TEXT
);
1473 sympp2
[i
++] = coff_section_symbol (abfd
, _DATA
);
1475 sympp2
[i
++] = coff_section_symbol (abfd
, _BSS
);
1476 BFD_ASSERT (i
== nsyms
);
1477 bfd_set_symtab (abfd
, sympp2
, nsyms
);
1481 #endif /* ! defined (RS6000COFF_C) */
1486 coff_write_object_contents (abfd
)
1492 boolean hasrelocs
= false;
1493 boolean haslinno
= false;
1494 file_ptr reloc_base
;
1495 file_ptr lineno_base
;
1499 unsigned long reloc_size
= 0;
1500 unsigned long lnno_size
= 0;
1501 asection
*text_sec
= NULL
;
1502 asection
*data_sec
= NULL
;
1503 asection
*bss_sec
= NULL
;
1505 struct internal_filehdr internal_f
;
1506 struct internal_aouthdr internal_a
;
1509 bfd_set_error (bfd_error_system_call
);
1510 /* Number the output sections, starting from one on the first section
1511 with a name which doesn't start with a *.
1512 @@ The code doesn't make this check. Is it supposed to be done,
1515 for (current
= abfd
->sections
; current
!= (asection
*) NULL
;
1516 current
= current
->next
)
1518 current
->target_index
= count
;
1522 if (abfd
->output_has_begun
== false)
1524 coff_compute_section_file_positions (abfd
);
1527 if (abfd
->sections
!= (asection
*) NULL
)
1529 scn_base
= abfd
->sections
->filepos
;
1535 if (bfd_seek (abfd
, scn_base
, SEEK_SET
) != 0)
1537 reloc_base
= obj_relocbase (abfd
);
1539 /* Make a pass through the symbol table to count line number entries and
1540 put them into the correct asections */
1542 lnno_size
= coff_count_linenumbers (abfd
) * LINESZ
;
1543 data_base
= scn_base
;
1545 /* Work out the size of the reloc and linno areas */
1547 for (current
= abfd
->sections
; current
!= NULL
; current
=
1550 /* We give section headers to +ve indexes */
1551 if (current
->target_index
> 0)
1554 reloc_size
+= current
->reloc_count
* RELSZ
;
1555 data_base
+= SCNHSZ
;
1560 lineno_base
= reloc_base
+ reloc_size
;
1561 sym_base
= lineno_base
+ lnno_size
;
1563 /* Indicate in each section->line_filepos its actual file address */
1564 for (current
= abfd
->sections
; current
!= NULL
; current
=
1567 if (current
->target_index
> 0)
1570 if (current
->lineno_count
)
1572 current
->line_filepos
= lineno_base
;
1573 current
->moving_line_filepos
= lineno_base
;
1574 lineno_base
+= current
->lineno_count
* LINESZ
;
1578 current
->line_filepos
= 0;
1580 if (current
->reloc_count
)
1582 current
->rel_filepos
= reloc_base
;
1583 reloc_base
+= current
->reloc_count
* RELSZ
;
1587 current
->rel_filepos
= 0;
1594 /* Write section headers to the file. */
1595 internal_f
.f_nscns
= 0;
1597 (file_ptr
) ((abfd
->flags
& EXEC_P
) ?
1598 (FILHSZ
+ AOUTSZ
) : FILHSZ
),
1605 unsigned int pad
= abfd
->flags
& D_PAGED
? data_base
: 0;
1607 unsigned int pad
= 0;
1609 for (current
= abfd
->sections
;
1611 current
= current
->next
)
1613 struct internal_scnhdr section
;
1614 if (current
->target_index
> 0)
1616 internal_f
.f_nscns
++;
1617 strncpy (&(section
.s_name
[0]), current
->name
, 8);
1619 /* Always set s_vaddr of .lib to 0. This is right for SVR3.2
1620 Ian Taylor <ian@cygnus.com>. */
1621 if (strcmp (current
->name
, _LIB
) == 0)
1622 section
.s_vaddr
= 0;
1625 section
.s_vaddr
= current
->lma
+ pad
;
1626 section
.s_paddr
= current
->lma
+ pad
;
1627 section
.s_size
= current
->_raw_size
- pad
;
1629 If this section has no size or is unloadable then the scnptr
1632 if (current
->_raw_size
- pad
== 0 ||
1633 (current
->flags
& (SEC_LOAD
| SEC_HAS_CONTENTS
)) == 0)
1635 section
.s_scnptr
= 0;
1639 section
.s_scnptr
= current
->filepos
;
1641 section
.s_relptr
= current
->rel_filepos
;
1642 section
.s_lnnoptr
= current
->line_filepos
;
1643 section
.s_nreloc
= current
->reloc_count
;
1644 section
.s_nlnno
= current
->lineno_count
;
1645 if (current
->reloc_count
!= 0)
1647 if (current
->lineno_count
!= 0)
1650 section
.s_flags
= sec_to_styp_flags (current
->name
, current
->flags
);
1652 if (!strcmp (current
->name
, _TEXT
))
1656 else if (!strcmp (current
->name
, _DATA
))
1659 #ifdef TWO_DATA_SECS
1661 else if (!strcmp (current
->name
, ".data2"))
1664 #endif /* TWO_DATA_SECS */
1666 else if (!strcmp (current
->name
, _BSS
))
1672 section
.s_align
= (current
->alignment_power
1673 ? 1 << current
->alignment_power
1680 coff_swap_scnhdr_out (abfd
, §ion
, &buff
);
1681 if (bfd_write ((PTR
) (&buff
), 1, SCNHSZ
, abfd
) != SCNHSZ
)
1692 /* OK, now set up the filehdr... */
1694 /* Don't include the internal abs section in the section count */
1697 We will NOT put a fucking timestamp in the header here. Every time you
1698 put it back, I will come in and take it out again. I'm sorry. This
1699 field does not belong here. We fill it with a 0 so it compares the
1700 same but is not a reasonable time. -- gnu@cygnus.com
1702 internal_f
.f_timdat
= 0;
1704 if (bfd_get_symcount (abfd
) != 0)
1705 internal_f
.f_symptr
= sym_base
;
1707 internal_f
.f_symptr
= 0;
1709 internal_f
.f_flags
= 0;
1711 if (abfd
->flags
& EXEC_P
)
1712 internal_f
.f_opthdr
= AOUTSZ
;
1714 internal_f
.f_opthdr
= 0;
1717 internal_f
.f_flags
|= F_RELFLG
;
1719 internal_f
.f_flags
|= F_LNNO
;
1720 if (0 == bfd_get_symcount (abfd
))
1721 internal_f
.f_flags
|= F_LSYMS
;
1722 if (abfd
->flags
& EXEC_P
)
1723 internal_f
.f_flags
|= F_EXEC
;
1725 if (!abfd
->xvec
->byteorder_big_p
)
1726 internal_f
.f_flags
|= F_AR32WR
;
1728 internal_f
.f_flags
|= F_AR32W
;
1731 FIXME, should do something about the other byte orders and
1735 memset (&internal_a
, 0, sizeof internal_a
);
1737 /* Set up architecture-dependent stuff */
1740 unsigned int magic
= 0;
1741 unsigned short flags
= 0;
1742 coff_set_flags (abfd
, &magic
, &flags
);
1743 internal_f
.f_magic
= magic
;
1744 internal_f
.f_flags
|= flags
;
1745 /* ...and the "opt"hdr... */
1748 #ifdef ULTRA3 /* NYU's machine */
1749 /* FIXME: This is a bogus check. I really want to see if there
1750 * is a .shbss or a .shdata section, if so then set the magic
1751 * number to indicate a shared data executable.
1753 if (internal_f
.f_nscns
>= 7)
1754 internal_a
.magic
= SHMAGIC
; /* Shared magic */
1757 internal_a
.magic
= NMAGIC
;/* Assume separate i/d */
1758 #define __A_MAGIC_SET__
1761 internal_a
.magic
= (magic
== I960ROMAGIC
? NMAGIC
: OMAGIC
);
1762 #define __A_MAGIC_SET__
1765 #define __A_MAGIC_SET__
1766 internal_a
.magic
= PAGEMAGICBCS
;
1770 #define __A_MAGIC_SET__
1771 internal_a
.magic
= APOLLO_COFF_VERSION_NUMBER
;
1775 #define __A_MAGIC_SET__
1776 /* Never was anything here for the 68k */
1777 #endif /* M68 || WE32K */
1780 #define __A_MAGIC_SET__
1781 internal_a
.magic
= ZMAGIC
;
1785 #define __A_MAGIC_SET__
1786 internal_a
.magic
= (abfd
->flags
& D_PAGED
) ? RS6K_AOUTHDR_ZMAGIC
:
1787 (abfd
->flags
& WP_TEXT
) ? RS6K_AOUTHDR_NMAGIC
:
1788 RS6K_AOUTHDR_OMAGIC
;
1791 #ifndef __A_MAGIC_SET__
1792 #include "Your aouthdr magic number is not being set!"
1794 #undef __A_MAGIC_SET__
1797 /* Now should write relocs, strings, syms */
1798 obj_sym_filepos (abfd
) = sym_base
;
1800 if (bfd_get_symcount (abfd
) != 0)
1802 #ifndef RS6000COFF_C
1803 if (!coff_add_missing_symbols (abfd
))
1806 if (!coff_renumber_symbols (abfd
))
1808 coff_mangle_symbols (abfd
);
1809 if (! coff_write_symbols (abfd
))
1811 if (! coff_write_linenumbers (abfd
))
1813 if (! coff_write_relocs (abfd
))
1818 internal_a
.tsize
= bfd_get_section_size_before_reloc (text_sec
);
1819 internal_a
.text_start
= internal_a
.tsize
? text_sec
->vma
: 0;
1823 internal_a
.dsize
= bfd_get_section_size_before_reloc (data_sec
);
1824 internal_a
.data_start
= internal_a
.dsize
? data_sec
->vma
: 0;
1828 internal_a
.bsize
= bfd_get_section_size_before_reloc (bss_sec
);
1831 internal_a
.entry
= bfd_get_start_address (abfd
);
1832 internal_f
.f_nsyms
= bfd_get_symcount (abfd
);
1834 /* now write them */
1835 if (bfd_seek (abfd
, (file_ptr
) 0, SEEK_SET
) != 0)
1839 coff_swap_filehdr_out (abfd
, (PTR
) & internal_f
, (PTR
) & buff
);
1840 if (bfd_write ((PTR
) & buff
, 1, FILHSZ
, abfd
) != FILHSZ
)
1843 if (abfd
->flags
& EXEC_P
)
1846 coff_swap_aouthdr_out (abfd
, (PTR
) & internal_a
, (PTR
) & buff
);
1847 if (bfd_write ((PTR
) & buff
, 1, AOUTSZ
, abfd
) != AOUTSZ
)
1854 coff_set_section_contents (abfd
, section
, location
, offset
, count
)
1859 bfd_size_type count
;
1861 if (abfd
->output_has_begun
== false) /* set by bfd.c handler */
1862 coff_compute_section_file_positions (abfd
);
1865 /* If this is a .lib section, bump the vma address so that it
1866 winds up being the number of .lib sections output. This is
1867 right for SVR3.2. Shared libraries should probably get more
1868 generic support. Ian Taylor <ian@cygnus.com>. */
1869 if (strcmp (section
->name
, _LIB
) == 0)
1873 /* Don't write out bss sections - one way to do this is to
1874 see if the filepos has not been set. */
1875 if (section
->filepos
== 0)
1878 if (bfd_seek (abfd
, (file_ptr
) (section
->filepos
+ offset
), SEEK_SET
) != 0)
1883 return (bfd_write (location
, 1, count
, abfd
) == count
) ? true : false;
1889 coff_close_and_cleanup (abfd
)
1892 if (!bfd_read_p (abfd
))
1893 switch (abfd
->format
)
1896 if (!_bfd_write_archive_contents (abfd
))
1900 if (!coff_write_object_contents (abfd
))
1904 bfd_set_error (bfd_error_invalid_operation
);
1908 /* We depend on bfd_close to free all the memory on the obstack. */
1909 /* FIXME if bfd_release is not using obstacks! */
1916 buy_and_read (abfd
, where
, seek_direction
, size
)
1922 PTR area
= (PTR
) bfd_alloc (abfd
, size
);
1925 bfd_set_error (bfd_error_no_memory
);
1928 if (bfd_seek (abfd
, where
, seek_direction
) != 0
1929 || bfd_read (area
, 1, size
, abfd
) != size
)
1932 } /* buy_and_read() */
1938 Creating the linenumber table is done by reading in the entire
1939 coff linenumber table, and creating another table for internal use.
1941 A coff linenumber table is structured so that each function
1942 is marked as having a line number of 0. Each line within the
1943 function is an offset from the first line in the function. The
1944 base of the line number information for the table is stored in
1945 the symbol associated with the function.
1947 The information is copied from the external to the internal
1948 table, and each symbol which marks a function is marked by
1951 How does this work ?
1956 coff_slurp_line_table (abfd
, asect
)
1960 LINENO
*native_lineno
;
1961 alent
*lineno_cache
;
1963 BFD_ASSERT (asect
->lineno
== (alent
*) NULL
);
1965 native_lineno
= (LINENO
*) buy_and_read (abfd
,
1966 asect
->line_filepos
,
1969 asect
->lineno_count
));
1971 (alent
*) bfd_alloc (abfd
, (size_t) ((asect
->lineno_count
+ 1) * sizeof (alent
)));
1972 if (lineno_cache
== NULL
)
1974 bfd_set_error (bfd_error_no_memory
);
1979 unsigned int counter
= 0;
1980 alent
*cache_ptr
= lineno_cache
;
1981 LINENO
*src
= native_lineno
;
1983 while (counter
< asect
->lineno_count
)
1985 struct internal_lineno dst
;
1986 coff_swap_lineno_in (abfd
, src
, &dst
);
1987 cache_ptr
->line_number
= dst
.l_lnno
;
1989 if (cache_ptr
->line_number
== 0)
1991 coff_symbol_type
*sym
=
1992 (coff_symbol_type
*) (dst
.l_addr
.l_symndx
1993 + obj_raw_syments (abfd
))->u
.syment
._n
._n_n
._n_zeroes
;
1994 cache_ptr
->u
.sym
= (asymbol
*) sym
;
1995 sym
->lineno
= cache_ptr
;
1999 cache_ptr
->u
.offset
= dst
.l_addr
.l_paddr
2000 - bfd_section_vma (abfd
, asect
);
2001 } /* If no linenumber expect a symbol index */
2007 cache_ptr
->line_number
= 0;
2010 asect
->lineno
= lineno_cache
;
2011 /* FIXME, free native_lineno here, or use alloca or something. */
2016 coff_slurp_symbol_table (abfd
)
2019 combined_entry_type
*native_symbols
;
2020 coff_symbol_type
*cached_area
;
2021 unsigned int *table_ptr
;
2023 unsigned int number_of_symbols
= 0;
2024 if (obj_symbols (abfd
))
2026 if (bfd_seek (abfd
, obj_sym_filepos (abfd
), SEEK_SET
) != 0)
2029 /* Read in the symbol table */
2030 if ((native_symbols
= coff_get_normalized_symtab (abfd
)) == NULL
)
2035 /* Allocate enough room for all the symbols in cached form */
2037 (coff_symbol_type
*)
2038 bfd_alloc (abfd
, (size_t) (bfd_get_symcount (abfd
) * sizeof (coff_symbol_type
)));
2040 if (cached_area
== NULL
)
2042 bfd_set_error (bfd_error_no_memory
);
2047 bfd_alloc (abfd
, (size_t) (bfd_get_symcount (abfd
) * sizeof (unsigned int)));
2049 if (table_ptr
== NULL
)
2051 bfd_set_error (bfd_error_no_memory
);
2056 coff_symbol_type
*dst
= cached_area
;
2057 unsigned int last_native_index
= bfd_get_symcount (abfd
);
2058 unsigned int this_index
= 0;
2059 while (this_index
< last_native_index
)
2061 combined_entry_type
*src
= native_symbols
+ this_index
;
2062 table_ptr
[this_index
] = number_of_symbols
;
2063 dst
->symbol
.the_bfd
= abfd
;
2065 dst
->symbol
.name
= (char *) (src
->u
.syment
._n
._n_n
._n_offset
);
2066 /* We use the native name field to point to the cached field. */
2067 src
->u
.syment
._n
._n_n
._n_zeroes
= (long) dst
;
2068 dst
->symbol
.section
= coff_section_from_bfd_index (abfd
,
2069 src
->u
.syment
.n_scnum
);
2070 dst
->symbol
.flags
= 0;
2071 dst
->done_lineno
= false;
2073 switch (src
->u
.syment
.n_sclass
)
2078 dst
->symbol
.value
= src
->u
.syment
.n_value
- dst
->symbol
.section
->vma
;
2079 dst
->symbol
.flags
= BSF_EXPORT
| BSF_GLOBAL
;
2080 dst
->symbol
.flags
|= BSF_NOT_AT_END
;
2082 /* Fall through to next case */
2090 if ((src
->u
.syment
.n_scnum
) == 0)
2092 if ((src
->u
.syment
.n_value
) == 0)
2094 dst
->symbol
.section
= bfd_und_section_ptr
;
2095 dst
->symbol
.value
= 0;
2099 dst
->symbol
.section
= bfd_com_section_ptr
;
2100 dst
->symbol
.value
= (src
->u
.syment
.n_value
);
2106 Base the value as an index from the base of the
2110 dst
->symbol
.flags
= BSF_EXPORT
| BSF_GLOBAL
;
2111 dst
->symbol
.value
= src
->u
.syment
.n_value
- dst
->symbol
.section
->vma
;
2113 if (ISFCN ((src
->u
.syment
.n_type
)))
2116 A function ext does not go at the end of a file
2118 dst
->symbol
.flags
|= BSF_NOT_AT_END
;
2123 /* If this symbol has a csect aux of type LD, the scnlen field
2124 is actually the index of the containing csect symbol. We
2125 need to pointerize it. */
2126 if (src
->u
.syment
.n_numaux
> 0)
2128 combined_entry_type
*aux
;
2130 aux
= src
+ src
->u
.syment
.n_numaux
- 1;
2131 if (SMTYP_SMTYP (aux
->u
.auxent
.x_csect
.x_smtyp
) == XTY_LD
)
2133 aux
->u
.auxent
.x_csect
.x_scnlen
.p
=
2134 native_symbols
+ aux
->u
.auxent
.x_csect
.x_scnlen
.l
;
2135 aux
->fix_scnlen
= 1;
2142 case C_STAT
: /* static */
2144 case C_LEAFSTAT
: /* static leaf procedure */
2146 case C_LABEL
: /* label */
2147 if (src
->u
.syment
.n_scnum
== -2)
2148 dst
->symbol
.flags
= BSF_DEBUGGING
;
2150 dst
->symbol
.flags
= BSF_LOCAL
;
2152 Base the value as an index from the base of the section, if
2155 if (dst
->symbol
.section
)
2156 dst
->symbol
.value
= (src
->u
.syment
.n_value
) -
2157 dst
->symbol
.section
->vma
;
2159 dst
->symbol
.value
= (src
->u
.syment
.n_value
);
2162 case C_MOS
: /* member of structure */
2163 case C_EOS
: /* end of structure */
2164 #ifdef NOTDEF /* C_AUTOARG has the same value */
2166 case C_GLBLREG
: /* A29k-specific storage class */
2169 case C_REGPARM
: /* register parameter */
2170 case C_REG
: /* register variable */
2172 case C_AUTOARG
: /* 960-specific storage class */
2174 case C_TPDEF
: /* type definition */
2176 case C_AUTO
: /* automatic variable */
2177 case C_FIELD
: /* bit field */
2178 case C_ENTAG
: /* enumeration tag */
2179 case C_MOE
: /* member of enumeration */
2180 case C_MOU
: /* member of union */
2181 case C_UNTAG
: /* union tag */
2182 dst
->symbol
.flags
= BSF_DEBUGGING
;
2183 dst
->symbol
.value
= (src
->u
.syment
.n_value
);
2186 case C_FILE
: /* file name */
2187 case C_STRTAG
: /* structure tag */
2189 case C_BINCL
: /* beginning of include file */
2190 case C_EINCL
: /* ending of include file */
2202 dst
->symbol
.flags
= BSF_DEBUGGING
;
2203 dst
->symbol
.value
= (src
->u
.syment
.n_value
);
2208 dst
->symbol
.flags
= BSF_DEBUGGING
;
2209 dst
->symbol
.value
= src
->u
.syment
.n_value
;
2211 /* The value is actually a symbol index. Save a pointer to
2212 the symbol instead of the index. FIXME: This should use a
2214 src
->u
.syment
.n_value
=
2215 (long) (native_symbols
+ src
->u
.syment
.n_value
);
2220 case C_BLOCK
: /* ".bb" or ".eb" */
2221 case C_FCN
: /* ".bf" or ".ef" */
2222 case C_EFCN
: /* physical end of function */
2223 dst
->symbol
.flags
= BSF_LOCAL
;
2225 Base the value as an index from the base of the section
2227 dst
->symbol
.value
= (src
->u
.syment
.n_value
) - dst
->symbol
.section
->vma
;
2231 case C_EXTDEF
: /* external definition */
2232 case C_ULABEL
: /* undefined label */
2233 case C_USTATIC
: /* undefined static */
2234 case C_LINE
: /* line # reformatted as symbol table entry */
2235 case C_ALIAS
: /* duplicate tag */
2236 case C_HIDDEN
: /* ext symbol in dmert public lib */
2239 fprintf (stderr
, "Unrecognized storage class %d (assuming debugging)\n for %s symbol `%s'\n",
2240 src
->u
.syment
.n_sclass
, dst
->symbol
.section
->name
,
2243 dst
->symbol
.flags
= BSF_DEBUGGING
;
2244 dst
->symbol
.value
= (src
->u
.syment
.n_value
);
2248 /* BFD_ASSERT(dst->symbol.flags != 0);*/
2252 dst
->symbol
.udata
= 0;
2253 dst
->lineno
= (alent
*) NULL
;
2254 this_index
+= (src
->u
.syment
.n_numaux
) + 1;
2256 number_of_symbols
++;
2257 } /* walk the native symtab */
2258 } /* bfdize the native symtab */
2260 obj_symbols (abfd
) = cached_area
;
2261 obj_raw_syments (abfd
) = native_symbols
;
2263 obj_conv_table_size (abfd
) = bfd_get_symcount (abfd
);
2264 bfd_get_symcount (abfd
) = number_of_symbols
;
2265 obj_convert (abfd
) = table_ptr
;
2266 /* Slurp the line tables for each section too */
2272 coff_slurp_line_table (abfd
, p
);
2277 } /* coff_slurp_symbol_table() */
2283 Coff relocations are easily transformed into the internal BFD form
2286 Reading a coff relocation table is done in the following stages:
2288 o Read the entire coff relocation table into memory.
2290 o Process each relocation in turn; first swap it from the
2291 external to the internal form.
2293 o Turn the symbol referenced in the relocation's symbol index
2294 into a pointer into the canonical symbol table.
2295 This table is the same as the one returned by a call to
2296 @code{bfd_canonicalize_symtab}. The back end will call that
2297 routine and save the result if a canonicalization hasn't been done.
2299 o The reloc index is turned into a pointer to a howto
2300 structure, in a back end specific way. For instance, the 386
2301 and 960 use the @code{r_type} to directly produce an index
2302 into a howto table vector; the 88k subtracts a number from the
2303 @code{r_type} field and creates an addend field.
2309 #define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
2311 coff_symbol_type *coffsym = (coff_symbol_type *) NULL; \
2312 if (ptr && bfd_asymbol_bfd (ptr) != abfd) \
2313 coffsym = (obj_symbols (abfd) \
2314 + (cache_ptr->sym_ptr_ptr - symbols)); \
2316 coffsym = coff_symbol_from (abfd, ptr); \
2317 if (coffsym != (coff_symbol_type *) NULL \
2318 && coffsym->native->u.syment.n_scnum == 0) \
2319 cache_ptr->addend = 0; \
2320 else if (ptr && bfd_asymbol_bfd (ptr) == abfd \
2321 && ptr->section != (asection *) NULL) \
2322 cache_ptr->addend = - (ptr->section->vma + ptr->value); \
2324 cache_ptr->addend = 0; \
2329 coff_slurp_reloc_table (abfd
, asect
, symbols
)
2334 RELOC
*native_relocs
;
2335 arelent
*reloc_cache
;
2340 if (asect
->relocation
)
2342 if (asect
->reloc_count
== 0)
2344 if (asect
->flags
& SEC_CONSTRUCTOR
)
2346 if (!coff_slurp_symbol_table (abfd
))
2349 (RELOC
*) buy_and_read (abfd
,
2353 asect
->reloc_count
));
2354 reloc_cache
= (arelent
*)
2355 bfd_alloc (abfd
, (size_t) (asect
->reloc_count
* sizeof (arelent
)));
2357 if (reloc_cache
== NULL
)
2359 bfd_set_error (bfd_error_no_memory
);
2364 for (idx
= 0; idx
< asect
->reloc_count
; idx
++)
2366 #ifdef RELOC_PROCESSING
2367 struct internal_reloc dst
;
2368 struct external_reloc
*src
;
2370 cache_ptr
= reloc_cache
+ idx
;
2371 src
= native_relocs
+ idx
;
2372 bfd_swap_reloc_in (abfd
, src
, &dst
);
2374 RELOC_PROCESSING (cache_ptr
, &dst
, symbols
, abfd
, asect
);
2376 struct internal_reloc dst
;
2378 struct external_reloc
*src
;
2380 cache_ptr
= reloc_cache
+ idx
;
2381 src
= native_relocs
+ idx
;
2383 bfd_swap_reloc_in (abfd
, src
, &dst
);
2386 cache_ptr
->address
= dst
.r_vaddr
;
2388 if (dst
.r_symndx
!= -1)
2390 /* @@ Should never be greater than count of symbols! */
2391 if (dst
.r_symndx
>= obj_conv_table_size (abfd
))
2393 cache_ptr
->sym_ptr_ptr
= symbols
+ obj_convert (abfd
)[dst
.r_symndx
];
2394 ptr
= *(cache_ptr
->sym_ptr_ptr
);
2398 cache_ptr
->sym_ptr_ptr
= bfd_abs_section_ptr
->symbol_ptr_ptr
;
2402 /* The symbols definitions that we have read in have been
2403 relocated as if their sections started at 0. But the offsets
2404 refering to the symbols in the raw data have not been
2405 modified, so we have to have a negative addend to compensate.
2407 Note that symbols which used to be common must be left alone */
2409 /* Calculate any reloc addend by looking at the symbol */
2410 CALC_ADDEND (abfd
, ptr
, dst
, cache_ptr
);
2412 cache_ptr
->address
-= asect
->vma
;
2413 /* !! cache_ptr->section = (asection *) NULL;*/
2415 /* Fill in the cache_ptr->howto field from dst.r_type */
2416 RTYPE2HOWTO (cache_ptr
, &dst
);
2421 asect
->relocation
= reloc_cache
;
2426 /* This is stupid. This function should be a boolean predicate. */
2428 coff_canonicalize_reloc (abfd
, section
, relptr
, symbols
)
2434 arelent
*tblptr
= section
->relocation
;
2435 unsigned int count
= 0;
2438 if (section
->flags
& SEC_CONSTRUCTOR
)
2440 /* this section has relocs made up by us, they are not in the
2441 file, so take them out of their chain and place them into
2442 the data area provided */
2443 arelent_chain
*chain
= section
->constructor_chain
;
2444 for (count
= 0; count
< section
->reloc_count
; count
++)
2446 *relptr
++ = &chain
->relent
;
2447 chain
= chain
->next
;
2453 if (! coff_slurp_reloc_table (abfd
, section
, symbols
))
2456 tblptr
= section
->relocation
;
2458 for (; count
++ < section
->reloc_count
;)
2459 *relptr
++ = tblptr
++;
2464 return section
->reloc_count
;
2469 coff_sym_filepos (abfd
)
2472 return obj_sym_filepos (abfd
);
2476 #ifndef coff_reloc16_estimate
2477 #define coff_reloc16_estimate dummy_reloc16_estimate
2480 dummy_reloc16_estimate (abfd
, input_section
, reloc
, shrink
, link_info
)
2482 asection
*input_section
;
2484 unsigned int shrink
;
2485 struct bfd_link_info
*link_info
;
2492 #ifndef coff_reloc16_extra_cases
2493 #define coff_reloc16_extra_cases dummy_reloc16_extra_cases
2494 /* This works even if abort is not declared in any header file. */
2496 dummy_reloc16_extra_cases (abfd
, link_info
, link_order
, reloc
, data
, src_ptr
,
2499 struct bfd_link_info
*link_info
;
2500 struct bfd_link_order
*link_order
;
2503 unsigned int *src_ptr
;
2504 unsigned int *dst_ptr
;
2506 fprintf (stderr
, "%s\n", reloc
->howto
->name
);
2511 static CONST bfd_coff_backend_data bfd_coff_std_swap_table
=
2513 coff_swap_aux_in
, coff_swap_sym_in
, coff_swap_lineno_in
,
2514 coff_swap_aux_out
, coff_swap_sym_out
,
2515 coff_swap_lineno_out
, coff_swap_reloc_out
,
2516 coff_swap_filehdr_out
, coff_swap_aouthdr_out
,
2517 coff_swap_scnhdr_out
,
2518 FILHSZ
, AOUTSZ
, SCNHSZ
, SYMESZ
, AUXESZ
, LINESZ
,
2519 #ifdef COFF_LONG_FILENAMES
2524 coff_swap_filehdr_in
, coff_swap_aouthdr_in
, coff_swap_scnhdr_in
,
2525 coff_bad_format_hook
, coff_set_arch_mach_hook
, coff_mkobject_hook
,
2526 styp_to_sec_flags
, coff_make_section_hook
, coff_set_alignment_hook
,
2527 coff_slurp_symbol_table
, symname_in_debug_hook
,
2528 coff_reloc16_extra_cases
, coff_reloc16_estimate
2531 #define coff_close_and_cleanup _bfd_generic_close_and_cleanup
2532 #define coff_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
2533 #define coff_get_section_contents _bfd_generic_get_section_contents
2535 #define coff_bfd_copy_private_section_data \
2536 _bfd_generic_bfd_copy_private_section_data
2537 #define coff_bfd_copy_private_bfd_data _bfd_generic_bfd_copy_private_bfd_data
2539 #ifndef coff_bfd_is_local_label
2540 #define coff_bfd_is_local_label bfd_generic_is_local_label
2543 /* The reloc lookup routine must be supplied by each individual COFF
2545 #ifndef coff_bfd_reloc_type_lookup
2546 #define coff_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
2549 #define coff_bfd_get_relocated_section_contents \
2550 bfd_generic_get_relocated_section_contents
2551 #define coff_bfd_relax_section bfd_generic_relax_section
2552 #define coff_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
2553 #define coff_bfd_link_add_symbols _bfd_generic_link_add_symbols
2554 #define coff_bfd_final_link _bfd_generic_final_link