1 /* Support for the generic parts of most COFF variants, for BFD.
2 Copyright 1990, 1991, 1992, 1993 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 tag field of this symbol be renumbered.
256 . Created by coff_pointerize_aux. *}
259 . {* Should the endidx field of this symbol be renumbered.
260 . Created by coff_pointerize_aux. *}
263 . {* The container for the symbol structure as read and translated
267 . union internal_auxent auxent;
268 . struct internal_syment syment;
270 .} combined_entry_type;
273 .{* Each canonical asymbol really looks like this: *}
275 .typedef struct coff_symbol_struct
277 . {* The actual symbol which the rest of BFD works with *}
280 . {* A pointer to the hidden information for this symbol *}
281 .combined_entry_type *native;
283 . {* A pointer to the linenumber information for this symbol *}
284 .struct lineno_cache_entry *lineno;
286 . {* Have the line numbers been relocated yet ? *}
287 .boolean done_lineno;
294 #include "coffswap.h"
296 /* void warning(); */
299 * Return a word with STYP_* (scnhdr.s_flags) flags set to represent the
300 * incoming SEC_* flags. The inverse of this function is styp_to_sec_flags().
301 * NOTE: If you add to/change this routine, you should mirror the changes
302 * in styp_to_sec_flags().
305 sec_to_styp_flags (sec_name
, sec_flags
)
306 CONST
char *sec_name
;
311 if (!strcmp(sec_name
, _TEXT
))
313 styp_flags
= STYP_TEXT
;
315 else if (!strcmp(sec_name
, _DATA
))
317 styp_flags
= STYP_DATA
;
320 else if (!strcmp(sec_name
, ".data2"))
322 styp_flags
= STYP_DATA
;
323 #endif /* TWO_DATA_SECS */
325 else if (!strcmp(sec_name
, _BSS
))
327 styp_flags
= STYP_BSS
;
330 else if (!strcmp(sec_name
, _COMMENT
))
332 styp_flags
= STYP_INFO
;
333 #endif /* _COMMENT */
336 else if (!strcmp(sec_name
, _LIB
))
338 styp_flags
= STYP_LIB
;
342 else if (!strcmp (sec_name
, _LIT
))
344 styp_flags
= STYP_LIT
;
347 else if (!strcmp(sec_name
, ".debug"))
349 styp_flags
= STYP_INFO
;
351 else if (!strcmp(sec_name
, ".stab")
352 || !strncmp(sec_name
, ".stabstr", 8))
354 styp_flags
= STYP_INFO
;
356 /* Try and figure out what it should be */
357 else if (sec_flags
& SEC_CODE
)
359 styp_flags
= STYP_TEXT
;
361 else if (sec_flags
& SEC_DATA
)
363 styp_flags
= STYP_DATA
;
365 else if (sec_flags
& SEC_READONLY
)
367 #ifdef STYP_LIT /* 29k readonly text/data section */
368 styp_flags
= STYP_LIT
;
370 styp_flags
= STYP_TEXT
;
371 #endif /* STYP_LIT */
373 else if (sec_flags
& SEC_LOAD
)
375 styp_flags
= STYP_TEXT
;
377 else if (sec_flags
& SEC_ALLOC
)
379 styp_flags
= STYP_BSS
;
383 if (sec_flags
& SEC_NEVER_LOAD
)
384 styp_flags
|= STYP_NOLOAD
;
390 * Return a word with SEC_* flags set to represent the incoming
391 * STYP_* flags (from scnhdr.s_flags). The inverse of this
392 * function is sec_to_styp_flags().
393 * NOTE: If you add to/change this routine, you should mirror the changes
394 * in sec_to_styp_flags().
397 DEFUN(styp_to_sec_flags
, (abfd
, hdr
),
401 struct internal_scnhdr
*internal_s
= (struct internal_scnhdr
*) hdr
;
402 long styp_flags
= internal_s
->s_flags
;
403 flagword sec_flags
=0;
406 if (styp_flags
& STYP_NOLOAD
)
408 sec_flags
|= SEC_NEVER_LOAD
;
410 #endif /* STYP_NOLOAD */
412 /* For 386 COFF, at least, an unloadable text or data section is
413 actually a shared library section. */
414 if (styp_flags
& STYP_TEXT
)
416 if (sec_flags
& SEC_NEVER_LOAD
)
417 sec_flags
|= SEC_CODE
| SEC_SHARED_LIBRARY
;
419 sec_flags
|= SEC_CODE
| SEC_LOAD
| SEC_ALLOC
;
421 else if (styp_flags
& STYP_DATA
)
423 if (sec_flags
& SEC_NEVER_LOAD
)
424 sec_flags
|= SEC_DATA
| SEC_SHARED_LIBRARY
;
426 sec_flags
|= SEC_DATA
| SEC_LOAD
| SEC_ALLOC
;
428 else if (styp_flags
& STYP_BSS
)
430 #ifdef BSS_NOLOAD_IS_SHARED_LIBRARY
431 if (sec_flags
& SEC_NEVER_LOAD
)
432 sec_flags
|= SEC_ALLOC
| SEC_SHARED_LIBRARY
;
435 sec_flags
|= SEC_ALLOC
;
437 else if (styp_flags
& STYP_INFO
)
439 /* This should be marked as SEC_DEBUGGING, but that can't be
440 done until we make sure that strip can still work. strip
441 will probably have to preserve the same number of sections to
442 ensure that the section vma matches the section file
447 sec_flags
|= SEC_ALLOC
| SEC_LOAD
;
450 #ifdef STYP_LIT /* A29k readonly text/data section type */
451 if ((styp_flags
& STYP_LIT
) == STYP_LIT
)
453 sec_flags
= (SEC_LOAD
| SEC_ALLOC
| SEC_READONLY
);
455 #endif /* STYP_LIT */
456 #ifdef STYP_OTHER_LOAD /* Other loaded sections */
457 if (styp_flags
& STYP_OTHER_LOAD
)
459 sec_flags
= (SEC_LOAD
| SEC_ALLOC
);
461 #endif /* STYP_SDATA */
466 #define get_index(symbol) ((long) (symbol)->udata)
470 bfd_coff_backend_data
474 Special entry points for gdb to swap in coff symbol table parts:
477 . void (*_bfd_coff_swap_aux_in) PARAMS ((
484 . void (*_bfd_coff_swap_sym_in) PARAMS ((
489 . void (*_bfd_coff_swap_lineno_in) PARAMS ((
495 Special entry points for gas to swap out coff parts:
497 . unsigned int (*_bfd_coff_swap_aux_out) PARAMS ((
504 . unsigned int (*_bfd_coff_swap_sym_out) PARAMS ((
509 . unsigned int (*_bfd_coff_swap_lineno_out) PARAMS ((
514 . unsigned int (*_bfd_coff_swap_reloc_out) PARAMS ((
519 . unsigned int (*_bfd_coff_swap_filehdr_out) PARAMS ((
524 . unsigned int (*_bfd_coff_swap_aouthdr_out) PARAMS ((
529 . unsigned int (*_bfd_coff_swap_scnhdr_out) PARAMS ((
535 Special entry points for generic COFF routines to call target
536 dependent COFF routines:
538 . unsigned int _bfd_filhsz;
539 . unsigned int _bfd_aoutsz;
540 . unsigned int _bfd_scnhsz;
541 . unsigned int _bfd_symesz;
542 . unsigned int _bfd_auxesz;
543 . unsigned int _bfd_linesz;
544 . boolean _bfd_coff_long_filenames;
545 . void (*_bfd_coff_swap_filehdr_in) PARAMS ((
549 . void (*_bfd_coff_swap_aouthdr_in) PARAMS ((
553 . void (*_bfd_coff_swap_scnhdr_in) PARAMS ((
557 . boolean (*_bfd_coff_bad_format_hook) PARAMS ((
559 . PTR internal_filehdr));
560 . boolean (*_bfd_coff_set_arch_mach_hook) PARAMS ((
562 . PTR internal_filehdr));
563 . PTR (*_bfd_coff_mkobject_hook) PARAMS ((
565 . PTR internal_filehdr,
566 . PTR internal_aouthdr));
567 . flagword (*_bfd_styp_to_sec_flags_hook) PARAMS ((
569 . PTR internal_scnhdr));
570 . asection *(*_bfd_make_section_hook) PARAMS ((
573 . void (*_bfd_set_alignment_hook) PARAMS ((
576 . PTR internal_scnhdr));
577 . boolean (*_bfd_coff_slurp_symbol_table) PARAMS ((
579 . boolean (*_bfd_coff_symname_in_debug) PARAMS ((
581 . struct internal_syment *sym));
582 . void (*_bfd_coff_reloc16_extra_cases) PARAMS ((
584 . struct bfd_seclet *seclet,
587 . unsigned int *src_ptr,
588 . unsigned int *dst_ptr));
589 . int (*_bfd_coff_reloc16_estimate) PARAMS ((
590 . asection *input_section,
593 . unsigned int shrink));
595 .} bfd_coff_backend_data;
597 .#define coff_backend_info(abfd) ((bfd_coff_backend_data *) (abfd)->xvec->backend_data)
599 .#define bfd_coff_swap_aux_in(a,e,t,c,i) \
600 . ((coff_backend_info (a)->_bfd_coff_swap_aux_in) (a,e,t,c,i))
602 .#define bfd_coff_swap_sym_in(a,e,i) \
603 . ((coff_backend_info (a)->_bfd_coff_swap_sym_in) (a,e,i))
605 .#define bfd_coff_swap_lineno_in(a,e,i) \
606 . ((coff_backend_info ( a)->_bfd_coff_swap_lineno_in) (a,e,i))
608 .#define bfd_coff_swap_reloc_out(abfd, i, o) \
609 . ((coff_backend_info (abfd)->_bfd_coff_swap_reloc_out) (abfd, i, o))
611 .#define bfd_coff_swap_lineno_out(abfd, i, o) \
612 . ((coff_backend_info (abfd)->_bfd_coff_swap_lineno_out) (abfd, i, o))
614 .#define bfd_coff_swap_aux_out(abfd, i, t,c,o) \
615 . ((coff_backend_info (abfd)->_bfd_coff_swap_aux_out) (abfd, i,t,c, o))
617 .#define bfd_coff_swap_sym_out(abfd, i,o) \
618 . ((coff_backend_info (abfd)->_bfd_coff_swap_sym_out) (abfd, i, o))
620 .#define bfd_coff_swap_scnhdr_out(abfd, i,o) \
621 . ((coff_backend_info (abfd)->_bfd_coff_swap_scnhdr_out) (abfd, i, o))
623 .#define bfd_coff_swap_filehdr_out(abfd, i,o) \
624 . ((coff_backend_info (abfd)->_bfd_coff_swap_filehdr_out) (abfd, i, o))
626 .#define bfd_coff_swap_aouthdr_out(abfd, i,o) \
627 . ((coff_backend_info (abfd)->_bfd_coff_swap_aouthdr_out) (abfd, i, o))
629 .#define bfd_coff_filhsz(abfd) (coff_backend_info (abfd)->_bfd_filhsz)
630 .#define bfd_coff_aoutsz(abfd) (coff_backend_info (abfd)->_bfd_aoutsz)
631 .#define bfd_coff_scnhsz(abfd) (coff_backend_info (abfd)->_bfd_scnhsz)
632 .#define bfd_coff_symesz(abfd) (coff_backend_info (abfd)->_bfd_symesz)
633 .#define bfd_coff_auxesz(abfd) (coff_backend_info (abfd)->_bfd_auxesz)
634 .#define bfd_coff_linesz(abfd) (coff_backend_info (abfd)->_bfd_linesz)
635 .#define bfd_coff_long_filenames(abfd) (coff_backend_info (abfd)->_bfd_coff_long_filenames)
636 .#define bfd_coff_swap_filehdr_in(abfd, i,o) \
637 . ((coff_backend_info (abfd)->_bfd_coff_swap_filehdr_in) (abfd, i, o))
639 .#define bfd_coff_swap_aouthdr_in(abfd, i,o) \
640 . ((coff_backend_info (abfd)->_bfd_coff_swap_aouthdr_in) (abfd, i, o))
642 .#define bfd_coff_swap_scnhdr_in(abfd, i,o) \
643 . ((coff_backend_info (abfd)->_bfd_coff_swap_scnhdr_in) (abfd, i, o))
645 .#define bfd_coff_bad_format_hook(abfd, filehdr) \
646 . ((coff_backend_info (abfd)->_bfd_coff_bad_format_hook) (abfd, filehdr))
648 .#define bfd_coff_set_arch_mach_hook(abfd, filehdr)\
649 . ((coff_backend_info (abfd)->_bfd_coff_set_arch_mach_hook) (abfd, filehdr))
650 .#define bfd_coff_mkobject_hook(abfd, filehdr, aouthdr)\
651 . ((coff_backend_info (abfd)->_bfd_coff_mkobject_hook) (abfd, filehdr, aouthdr))
653 .#define bfd_coff_styp_to_sec_flags_hook(abfd, scnhdr)\
654 . ((coff_backend_info (abfd)->_bfd_styp_to_sec_flags_hook) (abfd, scnhdr))
656 .#define bfd_coff_make_section_hook(abfd, name)\
657 . ((coff_backend_info (abfd)->_bfd_make_section_hook) (abfd, name))
659 .#define bfd_coff_set_alignment_hook(abfd, sec, scnhdr)\
660 . ((coff_backend_info (abfd)->_bfd_set_alignment_hook) (abfd, sec, scnhdr))
662 .#define bfd_coff_slurp_symbol_table(abfd)\
663 . ((coff_backend_info (abfd)->_bfd_coff_slurp_symbol_table) (abfd))
665 .#define bfd_coff_symname_in_debug(abfd, sym)\
666 . ((coff_backend_info (abfd)->_bfd_coff_symname_in_debug) (abfd, sym))
668 .#define bfd_coff_reloc16_extra_cases(abfd, seclet, reloc, data, src_ptr, dst_ptr)\
669 . ((coff_backend_info (abfd)->_bfd_coff_reloc16_extra_cases)\
670 . (abfd, seclet, reloc, data, src_ptr, dst_ptr))
672 .#define bfd_coff_reloc16_estimate(abfd, section, symbols, reloc, shrink)\
673 . ((coff_backend_info (abfd)->_bfd_coff_reloc16_estimate)\
674 . (section, symbols, reloc, shrink))
678 /* See whether the magic number matches. */
681 DEFUN(coff_bad_format_hook
, (abfd
, filehdr
),
685 struct internal_filehdr
*internal_f
= (struct internal_filehdr
*) filehdr
;
687 if (BADMAG (*internal_f
))
690 /* if the optional header is NULL or not the correct size then
691 quit; the only difference I can see between m88k dgux headers (MC88DMAGIC)
692 and Intel 960 readwrite headers (I960WRMAGIC) is that the
693 optional header is of a different size.
695 But the mips keeps extra stuff in it's opthdr, so dont check
699 #if defined(M88) || defined(I960)
700 if (internal_f
->f_opthdr
!= 0 && AOUTSZ
!= internal_f
->f_opthdr
)
708 DEFUN (coff_make_section_hook
, (abfd
, name
),
713 /* FIXME: This predates the call to bfd_make_section_anyway
714 in make_a_section_from_file, and can probably go away. */
715 /* On SCO a file created by the Microsoft assembler can have two
716 .data sections. We use .data2 for the second one. */
717 if (strcmp (name
, _DATA
) == 0)
718 return bfd_make_section (abfd
, ".data2");
720 return (asection
*) NULL
;
724 initialize a section structure with information peculiar to this
725 particular implementation of coff
729 DEFUN(coff_new_section_hook
,(abfd
, section
),
733 section
->alignment_power
= abfd
->xvec
->align_power_min
;
734 /* Allocate aux records for section symbols, to store size and
737 @@ Shouldn't use constant multiplier here! */
738 coffsymbol (section
->symbol
)->native
=
739 (combined_entry_type
*) bfd_zalloc (abfd
,
740 sizeof (combined_entry_type
) * 10);
747 /* Set the alignment of a BFD section. */
750 DEFUN (coff_set_alignment_hook
, (abfd
, section
, scnhdr
),
752 asection
*section AND
755 struct internal_scnhdr
*hdr
= (struct internal_scnhdr
*) scnhdr
;
758 for (i
= 0; i
< 32; i
++)
759 if ((1 << i
) >= hdr
->s_align
)
761 section
->alignment_power
= i
;
766 #define coff_set_alignment_hook \
767 ((void (*) PARAMS ((bfd *, asection *, PTR))) bfd_void)
772 DEFUN(coff_mkobject
,(abfd
),
775 coff_data_type
*coff
;
777 abfd
->tdata
.coff_obj_data
= (struct coff_tdata
*)bfd_zalloc (abfd
,sizeof(coff_data_type
));
778 if (abfd
->tdata
.coff_obj_data
== 0){
779 bfd_error
= no_memory
;
782 coff
= coff_data (abfd
);
783 coff
->symbols
= (coff_symbol_type
*) NULL
;
784 coff
->conversion_table
= (unsigned int *) NULL
;
785 coff
->raw_syments
= (struct coff_ptr_struct
*) NULL
;
786 coff
->raw_linenos
= (struct lineno
*) NULL
;
788 /* make_abs_section(abfd);*/
792 /* Create the COFF backend specific information. */
795 DEFUN(coff_mkobject_hook
,(abfd
, filehdr
, aouthdr
),
800 struct internal_filehdr
*internal_f
= (struct internal_filehdr
*) filehdr
;
801 coff_data_type
*coff
;
803 if (coff_mkobject (abfd
) == false)
806 coff
= coff_data (abfd
);
808 coff
->sym_filepos
= internal_f
->f_symptr
;
809 coff
->flags
= internal_f
->f_flags
;
811 /* These members communicate important constants about the symbol
812 table to GDB's symbol-reading code. These `constants'
813 unfortunately vary among coff implementations... */
814 coff
->local_n_btmask
= N_BTMASK
;
815 coff
->local_n_btshft
= N_BTSHFT
;
816 coff
->local_n_tmask
= N_TMASK
;
817 coff
->local_n_tshift
= N_TSHIFT
;
818 coff
->local_symesz
= SYMESZ
;
819 coff
->local_auxesz
= AUXESZ
;
820 coff
->local_linesz
= LINESZ
;
825 /* Determine the machine architecture and type. FIXME: This is target
826 dependent because the magic numbers are defined in the target
827 dependent header files. But there is no particular need for this.
828 If the magic numbers were moved to a separate file, this function
829 would be target independent and would also be much more successful
830 at linking together COFF files for different architectures. */
833 coff_set_arch_mach_hook(abfd
, filehdr
)
838 enum bfd_architecture arch
;
839 struct internal_filehdr
*internal_f
= (struct internal_filehdr
*) filehdr
;
842 switch (internal_f
->f_magic
) {
846 case I386AIXMAGIC
: /* Danbury PS/2 AIX C Compiler */
847 case LYNXCOFFMAGIC
: /* shadows the m68k Lynx number below, sigh */
848 arch
= bfd_arch_i386
;
853 #ifdef A29K_MAGIC_BIG
855 case A29K_MAGIC_LITTLE
:
856 arch
= bfd_arch_a29k
;
867 #ifdef APOLLOM68KMAGIC
868 case APOLLOM68KMAGIC
:
873 arch
= bfd_arch_m68k
;
881 arch
= bfd_arch_m88k
;
888 switch (internal_f
->f_flags
& F_MACHMASK
)
891 machine
= bfd_mach_z8001
;
894 machine
= bfd_mach_z8002
;
905 arch
= bfd_arch_i960
;
906 switch (F_I960TYPE
& internal_f
->f_flags
)
910 machine
= bfd_mach_i960_core
;
913 machine
= bfd_mach_i960_kb_sb
;
916 machine
= bfd_mach_i960_mc
;
919 machine
= bfd_mach_i960_xa
;
922 machine
= bfd_mach_i960_ca
;
925 machine
= bfd_mach_i960_ka_sa
;
936 arch
= bfd_arch_rs6000
;
943 arch
= bfd_arch_we32k
;
950 arch
= bfd_arch_h8300
;
951 machine
= bfd_mach_h8300
;
952 /* !! FIXME this probably isn't the right place for this */
953 abfd
->flags
|= BFD_IS_RELAXABLE
;
959 arch
= bfd_arch_h8300
;
960 machine
= bfd_mach_h8300h
;
961 /* !! FIXME this probably isn't the right place for this */
962 abfd
->flags
|= BFD_IS_RELAXABLE
;
975 arch
= bfd_arch_h8500
;
982 arch
= bfd_arch_sparc
;
987 default: /* Unreadable input file type */
988 arch
= bfd_arch_obscure
;
992 bfd_default_set_arch_mach(abfd
, arch
, machine
);
996 #ifdef SYMNAME_IN_DEBUG
999 DEFUN (symname_in_debug_hook
, (abfd
, sym
),
1001 struct internal_syment
*sym
)
1003 return SYMNAME_IN_DEBUG (sym
) ? true : false;
1008 #define symname_in_debug_hook \
1009 (boolean (*) PARAMS ((bfd *, struct internal_syment *))) bfd_false
1017 To write relocations, the back end steps though the
1018 canonical relocation table and create an
1019 @code{internal_reloc}. The symbol index to use is removed from
1020 the @code{offset} field in the symbol table supplied. The
1021 address comes directly from the sum of the section base
1022 address and the relocation offset; the type is dug directly
1023 from the howto field. Then the @code{internal_reloc} is
1024 swapped into the shape of an @code{external_reloc} and written
1030 DEFUN(coff_write_relocs
,(abfd
),
1034 for (s
= abfd
->sections
; s
!= (asection
*) NULL
; s
= s
->next
) {
1036 struct external_reloc dst
;
1038 arelent
**p
= s
->orelocation
;
1039 bfd_seek(abfd
, s
->rel_filepos
, SEEK_SET
);
1040 for (i
= 0; i
< s
->reloc_count
; i
++) {
1041 struct internal_reloc n
;
1043 memset((PTR
)&n
, 0, sizeof(n
));
1045 n
.r_vaddr
= q
->address
+ s
->vma
;
1046 /* The 29k const/consth reloc pair is a real kludge - the consth
1047 part doesn't have a symbol - it has an offset. So rebuilt
1050 if (q
->howto
->type
== R_IHCONST
)
1051 n
.r_symndx
= q
->addend
;
1058 if (q
->sym_ptr_ptr
== bfd_abs_section
.symbol_ptr_ptr
)
1060 /* This is a relocation relative to the absolute symbol */
1065 n
.r_symndx
= get_index((*(q
->sym_ptr_ptr
)));
1066 /* Take notice if the symbol reloc points to a symbol we don't have
1067 in our symbol table. What should we do for this?? */
1068 if (n
.r_symndx
> obj_conv_table_size (abfd
))
1076 /* Work out reloc type from what is required */
1077 SELECT_RELOC(n
.r_type
, q
->howto
);
1079 n
.r_type
= q
->howto
->type
;
1081 coff_swap_reloc_out(abfd
, &n
, &dst
);
1082 bfd_write((PTR
) &dst
, 1, RELSZ
, abfd
);
1087 /* Set flags and magic number of a coff file from architecture and machine
1088 type. Result is true if we can represent the arch&type, false if not. */
1091 DEFUN(coff_set_flags
,(abfd
, magicp
, flagsp
),
1093 unsigned *magicp AND
1094 unsigned short *flagsp
)
1096 switch (bfd_get_arch(abfd
)) {
1100 switch (bfd_get_mach(abfd
))
1102 case bfd_mach_z8001
:
1105 case bfd_mach_z8002
:
1119 *magicp
= I960ROMAGIC
;
1121 ((bfd_get_file_flags(abfd) & WP_TEXT) ? I960ROMAGIC :
1122 I960RWMAGIC); FIXME???
1124 switch (bfd_get_mach(abfd
)) {
1125 case bfd_mach_i960_core
:
1128 case bfd_mach_i960_kb_sb
:
1131 case bfd_mach_i960_mc
:
1134 case bfd_mach_i960_xa
:
1137 case bfd_mach_i960_ca
:
1140 case bfd_mach_i960_ka_sa
:
1153 *magicp
= I386MAGIC
;
1155 /* Just overwrite the usual value if we're doing Lynx. */
1156 *magicp
= LYNXCOFFMAGIC
;
1163 #ifdef APOLLOM68KMAGIC
1164 *magicp
= APOLLO_COFF_VERSION_NUMBER
;
1166 *magicp
= MC68MAGIC
;
1169 /* Just overwrite the usual value if we're doing Lynx. */
1170 *magicp
= LYNXCOFFMAGIC
;
1178 *magicp
= MC88OMAGIC
;
1183 case bfd_arch_h8300
:
1184 switch (bfd_get_mach (abfd
))
1186 case bfd_mach_h8300
:
1187 *magicp
= H8300MAGIC
;
1189 case bfd_mach_h8300h
:
1190 *magicp
= H8300HMAGIC
;
1204 case bfd_arch_sparc
:
1205 *magicp
= SPARCMAGIC
;
1207 /* Just overwrite the usual value if we're doing Lynx. */
1208 *magicp
= LYNXCOFFMAGIC
;
1215 case bfd_arch_h8500
:
1216 *magicp
= H8500MAGIC
;
1220 #ifdef A29K_MAGIC_BIG
1222 if (abfd
->xvec
->byteorder_big_p
)
1223 *magicp
= A29K_MAGIC_BIG
;
1225 *magicp
= A29K_MAGIC_LITTLE
;
1231 case bfd_arch_we32k
:
1232 *magicp
= WE32KMAGIC
;
1238 case bfd_arch_rs6000
:
1239 *magicp
= U802TOCMAGIC
;
1244 default: /* Unknown architecture */
1245 /* return false; -- fall through to "return false" below, to avoid
1246 "statement never reached" errors on the one below. */
1255 DEFUN(coff_set_arch_mach
,(abfd
, arch
, machine
),
1257 enum bfd_architecture arch AND
1258 unsigned long machine
)
1261 unsigned short dummy2
;
1262 bfd_default_set_arch_mach(abfd
, arch
, machine
);
1264 if (arch
!= bfd_arch_unknown
&&
1265 coff_set_flags(abfd
, &dummy1
, &dummy2
) != true)
1266 return false; /* We can't represent this type */
1267 return true; /* We're easy ... */
1271 /* Calculate the file position for each section. */
1274 DEFUN(coff_compute_section_file_positions
,(abfd
),
1278 asection
*previous
= (asection
*)NULL
;
1279 file_ptr sofar
= FILHSZ
;
1283 if (bfd_get_start_address(abfd
))
1285 /* A start address may have been added to the original file. In this
1286 case it will need an optional header to record it. */
1287 abfd
->flags
|= EXEC_P
;
1290 if (abfd
->flags
& EXEC_P
)
1293 sofar
+= abfd
->section_count
* SCNHSZ
;
1294 for (current
= abfd
->sections
;
1295 current
!= (asection
*)NULL
;
1296 current
= current
->next
) {
1298 /* Only deal with sections which have contents */
1299 if (!(current
->flags
& SEC_HAS_CONTENTS
))
1302 /* Align the sections in the file to the same boundary on
1303 which they are aligned in virtual memory. I960 doesn't
1304 do this (FIXME) so we can stay in sync with Intel. 960
1305 doesn't yet page from files... */
1308 /* make sure this section is aligned on the right boundary - by
1309 padding the previous section up if necessary */
1312 sofar
= BFD_ALIGN(sofar
, 1 << current
->alignment_power
);
1313 if (previous
!= (asection
*)NULL
) {
1314 previous
->_raw_size
+= sofar
- old_sofar
;
1319 /* FIXME, in demand paged files, the low order bits of the file
1320 offset must match the low order bits of the virtual address.
1321 "Low order" is apparently implementation defined. Add code
1322 here to round sofar up to match the virtual address. */
1324 current
->filepos
= sofar
;
1326 sofar
+= current
->_raw_size
;
1328 /* make sure that this section is of the right size too */
1330 sofar
= BFD_ALIGN(sofar
, 1 << current
->alignment_power
);
1331 current
->_raw_size
+= sofar
- old_sofar
;
1335 /* Force .lib sections to start at zero. The vma is then
1336 incremented in coff_set_section_contents. This is right for
1338 if (strcmp (current
->name
, _LIB
) == 0)
1339 bfd_set_section_vma (abfd
, current
, 0);
1344 obj_relocbase(abfd
) = sofar
;
1347 /* If .file, .text, .data, .bss symbols are missing, add them. */
1348 /* @@ Should we only be adding missing symbols, or overriding the aux
1349 values for existing section symbols? */
1351 coff_add_missing_symbols (abfd
)
1354 unsigned int nsyms
= bfd_get_symcount (abfd
);
1355 asymbol
**sympp
= abfd
->outsymbols
;
1358 int need_text
= 1, need_data
= 1, need_bss
= 1, need_file
= 1;
1360 for (i
= 0; i
< nsyms
; i
++)
1362 coff_symbol_type
*csym
= coff_symbol_from (abfd
, sympp
[i
]);
1366 /* only do this if there is a coff representation of the input
1368 if (csym
->native
&& csym
->native
->u
.syment
.n_sclass
== C_FILE
)
1373 name
= csym
->symbol
.name
;
1376 if (!strcmp (name
, _TEXT
))
1379 else if (!strcmp(name
, ".wtext"))
1382 else if (!strcmp (name
, _DATA
))
1384 else if (!strcmp (name
, _BSS
))
1388 /* Now i == bfd_get_symcount (abfd). */
1389 /* @@ For now, don't deal with .file symbol. */
1392 if (!need_text
&& !need_data
&& !need_bss
&& !need_file
)
1394 nsyms
+= need_text
+ need_data
+ need_bss
+ need_file
;
1395 sympp2
= (asymbol
**) bfd_alloc_by_size_t (abfd
, nsyms
* sizeof (asymbol
*));
1396 memcpy (sympp2
, sympp
, i
* sizeof (asymbol
*));
1399 /* @@ Generate fake .file symbol, in sympp2[i], and increment i. */
1403 sympp2
[i
++] = coff_section_symbol (abfd
, _TEXT
);
1405 sympp2
[i
++] = coff_section_symbol (abfd
, _DATA
);
1407 sympp2
[i
++] = coff_section_symbol (abfd
, _BSS
);
1408 BFD_ASSERT (i
== nsyms
);
1409 bfd_set_symtab (abfd
, sympp2
, nsyms
);
1415 DEFUN(coff_write_object_contents
,(abfd
),
1421 boolean hasrelocs
= false;
1422 boolean haslinno
= false;
1423 file_ptr reloc_base
;
1424 file_ptr lineno_base
;
1428 unsigned long reloc_size
= 0;
1429 unsigned long lnno_size
= 0;
1430 asection
*text_sec
= NULL
;
1431 asection
*data_sec
= NULL
;
1432 asection
*bss_sec
= NULL
;
1434 struct internal_filehdr internal_f
;
1435 struct internal_aouthdr internal_a
;
1438 bfd_error
= system_call_error
;
1439 /* Number the output sections, starting from one on the first section
1440 with a name which doesn't start with a *.
1441 @@ The code doesn't make this check. Is it supposed to be done,
1444 for (current
= abfd
->sections
; current
!= (asection
*)NULL
;
1445 current
= current
->next
)
1447 current
->target_index
= count
;
1451 if(abfd
->output_has_begun
== false) {
1452 coff_compute_section_file_positions(abfd
);
1455 if (abfd
->sections
!= (asection
*)NULL
) {
1456 scn_base
= abfd
->sections
->filepos
;
1461 if (bfd_seek(abfd
, scn_base
, SEEK_SET
) != 0)
1463 reloc_base
= obj_relocbase(abfd
);
1465 /* Make a pass through the symbol table to count line number entries and
1466 put them into the correct asections */
1468 lnno_size
= coff_count_linenumbers(abfd
) * LINESZ
;
1469 data_base
= scn_base
;
1471 /* Work out the size of the reloc and linno areas */
1473 for (current
= abfd
->sections
; current
!= NULL
; current
=
1476 /* We give section headers to +ve indexes */
1477 if (current
->target_index
> 0)
1480 reloc_size
+= current
->reloc_count
* RELSZ
;
1481 data_base
+= SCNHSZ
;
1486 lineno_base
= reloc_base
+ reloc_size
;
1487 sym_base
= lineno_base
+ lnno_size
;
1489 /* Indicate in each section->line_filepos its actual file address */
1490 for (current
= abfd
->sections
; current
!= NULL
; current
=
1493 if (current
->target_index
> 0)
1496 if (current
->lineno_count
) {
1497 current
->line_filepos
= lineno_base
;
1498 current
->moving_line_filepos
= lineno_base
;
1499 lineno_base
+= current
->lineno_count
* LINESZ
;
1502 current
->line_filepos
= 0;
1504 if (current
->reloc_count
) {
1505 current
->rel_filepos
= reloc_base
;
1506 reloc_base
+= current
->reloc_count
* RELSZ
;
1509 current
->rel_filepos
= 0;
1516 /* Write section headers to the file. */
1517 internal_f
.f_nscns
= 0;
1519 (file_ptr
) ((abfd
->flags
& EXEC_P
) ?
1520 (FILHSZ
+ AOUTSZ
) : FILHSZ
),
1525 unsigned int pad
= abfd
->flags
& D_PAGED
? data_base
: 0;
1527 unsigned int pad
= 0;
1529 for (current
= abfd
->sections
;
1531 current
= current
->next
) {
1532 struct internal_scnhdr section
;
1533 if (current
->target_index
> 0)
1535 internal_f
.f_nscns
++;
1536 strncpy(&(section
.s_name
[0]), current
->name
, 8);
1538 /* Always set s_vaddr of .lib to 0. This is right for SVR3.2
1539 Ian Taylor <ian@cygnus.com>. */
1540 if (strcmp (current
->name
, _LIB
) == 0)
1541 section
.s_vaddr
= 0;
1544 section
.s_vaddr
= current
->lma
+ pad
;
1545 section
.s_paddr
= current
->lma
+ pad
;
1546 section
.s_size
= current
->_raw_size
- pad
;
1548 If this section has no size or is unloadable then the scnptr
1551 if (current
->_raw_size
- pad
== 0 ||
1552 (current
->flags
& (SEC_LOAD
| SEC_HAS_CONTENTS
)) == 0) {
1553 section
.s_scnptr
= 0;
1556 section
.s_scnptr
= current
->filepos
;
1558 section
.s_relptr
= current
->rel_filepos
;
1559 section
.s_lnnoptr
= current
->line_filepos
;
1560 section
.s_nreloc
= current
->reloc_count
;
1561 section
.s_nlnno
= current
->lineno_count
;
1562 if (current
->reloc_count
!= 0)
1564 if (current
->lineno_count
!= 0)
1567 section
.s_flags
= sec_to_styp_flags(current
->name
,current
->flags
);
1569 if (!strcmp(current
->name
, _TEXT
)) {
1571 } else if (!strcmp(current
->name
, _DATA
)) {
1573 #ifdef TWO_DATA_SECS
1574 } else if (!strcmp(current
->name
, ".data2")) {
1576 #endif /* TWO_DATA_SECS */
1577 } else if (!strcmp(current
->name
, _BSS
)) {
1582 section
.s_align
= (current
->alignment_power
1583 ? 1 << current
->alignment_power
1590 coff_swap_scnhdr_out(abfd
, §ion
, &buff
);
1591 bfd_write((PTR
) (&buff
), 1, SCNHSZ
, abfd
);
1601 /* OK, now set up the filehdr... */
1603 /* Don't include the internal abs section in the section count */
1606 We will NOT put a fucking timestamp in the header here. Every time you
1607 put it back, I will come in and take it out again. I'm sorry. This
1608 field does not belong here. We fill it with a 0 so it compares the
1609 same but is not a reasonable time. -- gnu@cygnus.com
1611 internal_f
.f_timdat
= 0;
1613 if (bfd_get_symcount(abfd
) != 0)
1614 internal_f
.f_symptr
= sym_base
;
1616 internal_f
.f_symptr
= 0;
1618 internal_f
.f_flags
= 0;
1620 if (abfd
->flags
& EXEC_P
)
1621 internal_f
.f_opthdr
= AOUTSZ
;
1623 internal_f
.f_opthdr
= 0;
1626 internal_f
.f_flags
|= F_RELFLG
;
1628 internal_f
.f_flags
|= F_LNNO
;
1629 if (0 == bfd_get_symcount(abfd
))
1630 internal_f
.f_flags
|= F_LSYMS
;
1631 if (abfd
->flags
& EXEC_P
)
1632 internal_f
.f_flags
|= F_EXEC
;
1634 if (!abfd
->xvec
->byteorder_big_p
)
1635 internal_f
.f_flags
|= F_AR32WR
;
1637 internal_f
.f_flags
|= F_AR32W
;
1640 FIXME, should do something about the other byte orders and
1644 /* Set up architecture-dependent stuff */
1646 { unsigned int magic
= 0;
1647 unsigned short flags
= 0;
1648 coff_set_flags(abfd
, &magic
, &flags
);
1649 internal_f
.f_magic
= magic
;
1650 internal_f
.f_flags
|= flags
;
1651 /* ...and the "opt"hdr... */
1654 # ifdef ULTRA3 /* NYU's machine */
1655 /* FIXME: This is a bogus check. I really want to see if there
1656 * is a .shbss or a .shdata section, if so then set the magic
1657 * number to indicate a shared data executable.
1659 if (internal_f
.f_nscns
>= 7)
1660 internal_a
.magic
= SHMAGIC
; /* Shared magic */
1662 # endif /* ULTRA3 */
1663 internal_a
.magic
= NMAGIC
; /* Assume separate i/d */
1664 #define __A_MAGIC_SET__
1667 internal_a
.magic
= (magic
== I960ROMAGIC
? NMAGIC
: OMAGIC
);
1668 #define __A_MAGIC_SET__
1671 #define __A_MAGIC_SET__
1672 internal_a
.magic
= PAGEMAGICBCS
;
1676 #define __A_MAGIC_SET__
1677 internal_a
.magic
= APOLLO_COFF_VERSION_NUMBER
;
1681 #define __A_MAGIC_SET__
1682 /* Never was anything here for the 68k */
1683 #endif /* M68 || WE32K */
1686 # define __A_MAGIC_SET__
1687 internal_a
.magic
= ZMAGIC
;
1691 #define __A_MAGIC_SET__
1692 internal_a
.magic
= (abfd
->flags
& D_PAGED
)? RS6K_AOUTHDR_ZMAGIC
:
1693 (abfd
->flags
& WP_TEXT
)? RS6K_AOUTHDR_NMAGIC
:
1694 RS6K_AOUTHDR_OMAGIC
;
1697 #ifndef __A_MAGIC_SET__
1698 # include "Your aouthdr magic number is not being set!"
1700 # undef __A_MAGIC_SET__
1703 /* Now should write relocs, strings, syms */
1704 obj_sym_filepos(abfd
) = sym_base
;
1706 if (bfd_get_symcount(abfd
) != 0) {
1707 coff_add_missing_symbols (abfd
);
1708 coff_renumber_symbols(abfd
);
1709 coff_mangle_symbols(abfd
);
1710 coff_write_symbols(abfd
);
1711 coff_write_linenumbers(abfd
);
1712 coff_write_relocs(abfd
);
1715 internal_a
.tsize
= bfd_get_section_size_before_reloc(text_sec
);
1716 internal_a
.text_start
= internal_a
.tsize
? text_sec
->vma
: 0;
1719 internal_a
.dsize
= bfd_get_section_size_before_reloc(data_sec
);
1720 internal_a
.data_start
= internal_a
.dsize
? data_sec
->vma
: 0;
1723 internal_a
.bsize
= bfd_get_section_size_before_reloc(bss_sec
);
1726 internal_a
.entry
= bfd_get_start_address(abfd
);
1727 internal_f
.f_nsyms
= bfd_get_symcount(abfd
);
1729 /* now write them */
1730 if (bfd_seek(abfd
, (file_ptr
) 0, SEEK_SET
) != 0)
1734 coff_swap_filehdr_out(abfd
, (PTR
)&internal_f
, (PTR
)&buff
);
1735 bfd_write((PTR
) &buff
, 1, FILHSZ
, abfd
);
1737 if (abfd
->flags
& EXEC_P
) {
1739 coff_swap_aouthdr_out(abfd
, (PTR
)&internal_a
, (PTR
)&buff
);
1740 bfd_write((PTR
) &buff
, 1, AOUTSZ
, abfd
);
1746 DEFUN(coff_set_section_contents
,(abfd
, section
, location
, offset
, count
),
1751 bfd_size_type count
)
1753 if (abfd
->output_has_begun
== false) /* set by bfd.c handler */
1754 coff_compute_section_file_positions(abfd
);
1757 /* If this is a .lib section, bump the vma address so that it
1758 winds up being the number of .lib sections output. This is
1759 right for SVR3.2. Shared libraries should probably get more
1760 generic support. Ian Taylor <ian@cygnus.com>. */
1761 if (strcmp (section
->name
, _LIB
) == 0)
1765 /* Don't write out bss sections - one way to do this is to
1766 see if the filepos has not been set. */
1767 if (section
->filepos
== 0)
1770 bfd_seek(abfd
, (file_ptr
) (section
->filepos
+ offset
), SEEK_SET
);
1773 return (bfd_write(location
, 1, count
, abfd
) == count
) ? true : false;
1779 coff_close_and_cleanup(abfd
)
1782 if (!bfd_read_p(abfd
))
1783 switch (abfd
->format
) {
1785 if (!_bfd_write_archive_contents(abfd
))
1789 if (!coff_write_object_contents(abfd
))
1793 bfd_error
= invalid_operation
;
1797 /* We depend on bfd_close to free all the memory on the obstack. */
1798 /* FIXME if bfd_release is not using obstacks! */
1805 buy_and_read(abfd
, where
, seek_direction
, size
)
1811 PTR area
= (PTR
) bfd_alloc(abfd
, size
);
1813 bfd_error
= no_memory
;
1816 bfd_seek(abfd
, where
, seek_direction
);
1817 if (bfd_read(area
, 1, size
, abfd
) != size
) {
1818 bfd_error
= system_call_error
;
1822 } /* buy_and_read() */
1828 Creating the linenumber table is done by reading in the entire
1829 coff linenumber table, and creating another table for internal use.
1831 A coff linenumber table is structured so that each function
1832 is marked as having a line number of 0. Each line within the
1833 function is an offset from the first line in the function. The
1834 base of the line number information for the table is stored in
1835 the symbol associated with the function.
1837 The information is copied from the external to the internal
1838 table, and each symbol which marks a function is marked by
1841 How does this work ?
1846 coff_slurp_line_table(abfd
, asect
)
1850 LINENO
*native_lineno
;
1851 alent
*lineno_cache
;
1853 BFD_ASSERT(asect
->lineno
== (alent
*) NULL
);
1855 native_lineno
= (LINENO
*) buy_and_read(abfd
,
1856 asect
->line_filepos
,
1859 asect
->lineno_count
));
1861 (alent
*) bfd_alloc(abfd
, (size_t) ((asect
->lineno_count
+ 1) * sizeof(alent
)));
1862 if (lineno_cache
== NULL
) {
1863 bfd_error
= no_memory
;
1866 unsigned int counter
= 0;
1867 alent
*cache_ptr
= lineno_cache
;
1868 LINENO
*src
= native_lineno
;
1870 while (counter
< asect
->lineno_count
) {
1871 struct internal_lineno dst
;
1872 coff_swap_lineno_in(abfd
, src
, &dst
);
1873 cache_ptr
->line_number
= dst
.l_lnno
;
1875 if (cache_ptr
->line_number
== 0) {
1876 coff_symbol_type
*sym
=
1877 (coff_symbol_type
*) (dst
.l_addr
.l_symndx
1878 + obj_raw_syments(abfd
))->u
.syment
._n
._n_n
._n_zeroes
;
1879 cache_ptr
->u
.sym
= (asymbol
*) sym
;
1880 sym
->lineno
= cache_ptr
;
1883 cache_ptr
->u
.offset
= dst
.l_addr
.l_paddr
1884 - bfd_section_vma(abfd
, asect
);
1885 } /* If no linenumber expect a symbol index */
1891 cache_ptr
->line_number
= 0;
1894 asect
->lineno
= lineno_cache
;
1895 /* FIXME, free native_lineno here, or use alloca or something. */
1897 } /* coff_slurp_line_table() */
1900 DEFUN(coff_slurp_symbol_table
,(abfd
),
1903 combined_entry_type
*native_symbols
;
1904 coff_symbol_type
*cached_area
;
1905 unsigned int *table_ptr
;
1907 unsigned int number_of_symbols
= 0;
1908 if (obj_symbols(abfd
))
1910 bfd_seek(abfd
, obj_sym_filepos(abfd
), SEEK_SET
);
1912 /* Read in the symbol table */
1913 if ((native_symbols
= coff_get_normalized_symtab(abfd
)) == NULL
) {
1917 /* Allocate enough room for all the symbols in cached form */
1919 (coff_symbol_type
*)
1920 bfd_alloc(abfd
, (size_t) (bfd_get_symcount(abfd
) * sizeof(coff_symbol_type
)));
1922 if (cached_area
== NULL
) {
1923 bfd_error
= no_memory
;
1928 bfd_alloc(abfd
, (size_t) (bfd_get_symcount(abfd
) * sizeof(unsigned int)));
1930 if (table_ptr
== NULL
) {
1931 bfd_error
= no_memory
;
1936 coff_symbol_type
*dst
= cached_area
;
1937 unsigned int last_native_index
= bfd_get_symcount(abfd
);
1938 unsigned int this_index
= 0;
1939 while (this_index
< last_native_index
) {
1940 combined_entry_type
*src
= native_symbols
+ this_index
;
1941 table_ptr
[this_index
] = number_of_symbols
;
1942 dst
->symbol
.the_bfd
= abfd
;
1944 dst
->symbol
.name
= (char *)(src
->u
.syment
._n
._n_n
._n_offset
);
1946 We use the native name field to point to the cached field
1948 src
->u
.syment
._n
._n_n
._n_zeroes
= (long) dst
;
1949 dst
->symbol
.section
= coff_section_from_bfd_index(abfd
,
1950 src
->u
.syment
.n_scnum
);
1951 dst
->symbol
.flags
= 0;
1952 dst
->done_lineno
= false;
1954 switch (src
->u
.syment
.n_sclass
) {
1958 dst
->symbol
.value
= src
->u
.syment
.n_value
- dst
->symbol
.section
->vma
;
1959 dst
->symbol
.flags
= BSF_EXPORT
| BSF_GLOBAL
;
1960 dst
->symbol
.flags
|= BSF_NOT_AT_END
;
1962 /* Fall through to next case */
1970 if ((src
->u
.syment
.n_scnum
) == 0) {
1971 if ((src
->u
.syment
.n_value
) == 0) {
1972 dst
->symbol
.section
= &bfd_und_section
;
1973 dst
->symbol
.value
= 0;
1976 dst
->symbol
.section
= &bfd_com_section
;
1977 dst
->symbol
.value
= (src
->u
.syment
.n_value
);
1982 Base the value as an index from the base of the
1986 dst
->symbol
.flags
= BSF_EXPORT
| BSF_GLOBAL
;
1987 dst
->symbol
.value
= src
->u
.syment
.n_value
- dst
->symbol
.section
->vma
;
1989 if (ISFCN((src
->u
.syment
.n_type
))) {
1991 A function ext does not go at the end of a file
1993 dst
->symbol
.flags
|= BSF_NOT_AT_END
;
2000 case C_STAT
: /* static */
2002 case C_LEAFSTAT
: /* static leaf procedure */
2004 case C_LABEL
: /* label */
2005 if (src
->u
.syment
.n_scnum
== -2)
2006 dst
->symbol
.flags
= BSF_DEBUGGING
;
2008 dst
->symbol
.flags
= BSF_LOCAL
;
2010 Base the value as an index from the base of the section, if
2013 if (dst
->symbol
.section
)
2014 dst
->symbol
.value
= (src
->u
.syment
.n_value
) -
2015 dst
->symbol
.section
->vma
;
2017 dst
->symbol
.value
= (src
->u
.syment
.n_value
) ;
2020 case C_MOS
: /* member of structure */
2021 case C_EOS
: /* end of structure */
2022 #ifdef NOTDEF /* C_AUTOARG has the same value */
2024 case C_GLBLREG
: /* A29k-specific storage class */
2027 case C_REGPARM
: /* register parameter */
2028 case C_REG
: /* register variable */
2030 case C_AUTOARG
: /* 960-specific storage class */
2032 case C_TPDEF
: /* type definition */
2034 case C_AUTO
: /* automatic variable */
2035 case C_FIELD
: /* bit field */
2036 case C_ENTAG
: /* enumeration tag */
2037 case C_MOE
: /* member of enumeration */
2038 case C_MOU
: /* member of union */
2039 case C_UNTAG
: /* union tag */
2040 dst
->symbol
.flags
= BSF_DEBUGGING
;
2041 dst
->symbol
.value
= (src
->u
.syment
.n_value
);
2044 case C_FILE
: /* file name */
2045 case C_STRTAG
: /* structure tag */
2047 case C_BINCL
: /* beginning of include file */
2048 case C_EINCL
: /* ending of include file */
2061 dst
->symbol
.flags
= BSF_DEBUGGING
;
2062 dst
->symbol
.value
= (src
->u
.syment
.n_value
);
2065 case C_BLOCK
: /* ".bb" or ".eb" */
2066 case C_FCN
: /* ".bf" or ".ef" */
2067 case C_EFCN
: /* physical end of function */
2068 dst
->symbol
.flags
= BSF_LOCAL
;
2070 Base the value as an index from the base of the section
2072 dst
->symbol
.value
= (src
->u
.syment
.n_value
) - dst
->symbol
.section
->vma
;
2076 case C_EXTDEF
: /* external definition */
2077 case C_ULABEL
: /* undefined label */
2078 case C_USTATIC
: /* undefined static */
2079 case C_LINE
: /* line # reformatted as symbol table entry */
2080 case C_ALIAS
: /* duplicate tag */
2081 case C_HIDDEN
: /* ext symbol in dmert public lib */
2084 fprintf(stderr
,"Unrecognized storage class %d\n",
2085 src
->u
.syment
.n_sclass
);
2087 dst
->symbol
.flags
= BSF_DEBUGGING
;
2088 dst
->symbol
.value
= (src
->u
.syment
.n_value
);
2092 /* BFD_ASSERT(dst->symbol.flags != 0);*/
2096 dst
->symbol
.udata
= 0;
2097 dst
->lineno
= (alent
*) NULL
;
2098 this_index
+= (src
->u
.syment
.n_numaux
) + 1;
2100 number_of_symbols
++;
2101 } /* walk the native symtab */
2102 } /* bfdize the native symtab */
2104 obj_symbols(abfd
) = cached_area
;
2105 obj_raw_syments(abfd
) = native_symbols
;
2107 obj_conv_table_size (abfd
) = bfd_get_symcount (abfd
);
2108 bfd_get_symcount(abfd
) = number_of_symbols
;
2109 obj_convert(abfd
) = table_ptr
;
2110 /* Slurp the line tables for each section too */
2115 coff_slurp_line_table(abfd
, p
);
2120 } /* coff_slurp_symbol_table() */
2126 Coff relocations are easily transformed into the internal BFD form
2129 Reading a coff relocation table is done in the following stages:
2131 o Read the entire coff relocation table into memory.
2133 o Process each relocation in turn; first swap it from the
2134 external to the internal form.
2136 o Turn the symbol referenced in the relocation's symbol index
2137 into a pointer into the canonical symbol table.
2138 This table is the same as the one returned by a call to
2139 @code{bfd_canonicalize_symtab}. The back end will call that
2140 routine and save the result if a canonicalization hasn't been done.
2142 o The reloc index is turned into a pointer to a howto
2143 structure, in a back end specific way. For instance, the 386
2144 and 960 use the @code{r_type} to directly produce an index
2145 into a howto table vector; the 88k subtracts a number from the
2146 @code{r_type} field and creates an addend field.
2152 #define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
2153 if (ptr && bfd_asymbol_bfd(ptr) == abfd \
2154 && !bfd_is_com_section(ptr->section) \
2155 && !(ptr->flags & BSF_OLD_COMMON)) \
2157 cache_ptr->addend = -(ptr->section->vma + ptr->value); \
2160 cache_ptr->addend = 0; \
2165 DEFUN(coff_slurp_reloc_table
,(abfd
, asect
, symbols
),
2170 RELOC
*native_relocs
;
2171 arelent
*reloc_cache
;
2176 if (asect
->relocation
)
2178 if (asect
->reloc_count
== 0)
2180 if (asect
->flags
& SEC_CONSTRUCTOR
)
2182 if (!coff_slurp_symbol_table(abfd
))
2185 (RELOC
*) buy_and_read(abfd
,
2189 asect
->reloc_count
));
2190 reloc_cache
= (arelent
*)
2191 bfd_alloc(abfd
, (size_t) (asect
->reloc_count
* sizeof(arelent
)));
2193 if (reloc_cache
== NULL
) {
2194 bfd_error
= no_memory
;
2199 for (idx
= 0; idx
< asect
->reloc_count
; idx
++)
2201 #ifdef RELOC_PROCESSING
2202 struct internal_reloc dst
;
2203 struct external_reloc
*src
;
2205 cache_ptr
= reloc_cache
+ idx
;
2206 src
= native_relocs
+ idx
;
2207 bfd_swap_reloc_in(abfd
, src
, &dst
);
2209 RELOC_PROCESSING(cache_ptr
, &dst
, symbols
, abfd
, asect
);
2211 struct internal_reloc dst
;
2213 struct external_reloc
*src
;
2215 cache_ptr
= reloc_cache
+ idx
;
2216 src
= native_relocs
+ idx
;
2218 bfd_swap_reloc_in(abfd
, src
, &dst
);
2221 cache_ptr
->address
= dst
.r_vaddr
;
2223 if (dst
.r_symndx
!= -1)
2225 /* @@ Should never be greater than count of symbols! */
2226 if (dst
.r_symndx
>= obj_conv_table_size (abfd
))
2228 cache_ptr
->sym_ptr_ptr
= symbols
+ obj_convert(abfd
)[dst
.r_symndx
];
2229 ptr
= *(cache_ptr
->sym_ptr_ptr
);
2233 cache_ptr
->sym_ptr_ptr
= bfd_abs_section
.symbol_ptr_ptr
;
2238 The symbols definitions that we have read in have been
2239 relocated as if their sections started at 0. But the offsets
2240 refering to the symbols in the raw data have not been
2241 modified, so we have to have a negative addend to compensate.
2243 Note that symbols which used to be common must be left alone */
2245 /* Calculate any reloc addend by looking at the symbol */
2246 CALC_ADDEND(abfd
, ptr
, dst
, cache_ptr
);
2248 cache_ptr
->address
-= asect
->vma
;
2249 /* !! cache_ptr->section = (asection *) NULL;*/
2251 /* Fill in the cache_ptr->howto field from dst.r_type */
2252 RTYPE2HOWTO(cache_ptr
, &dst
);
2257 asect
->relocation
= reloc_cache
;
2262 /* This is stupid. This function should be a boolean predicate */
2264 DEFUN(coff_canonicalize_reloc
, (abfd
, section
, relptr
, symbols
),
2267 arelent
**relptr AND
2270 arelent
*tblptr
= section
->relocation
;
2271 unsigned int count
= 0;
2274 if (section
->flags
& SEC_CONSTRUCTOR
)
2276 /* this section has relocs made up by us, they are not in the
2277 file, so take them out of their chain and place them into
2278 the data area provided */
2279 arelent_chain
*chain
= section
->constructor_chain
;
2280 for (count
= 0; count
< section
->reloc_count
; count
++)
2282 *relptr
++ = &chain
->relent
;
2283 chain
= chain
->next
;
2289 coff_slurp_reloc_table(abfd
, section
, symbols
);
2292 tblptr
= section
->relocation
;
2296 for (; count
++ < section
->reloc_count
;)
2297 *relptr
++ = tblptr
++;
2302 return section
->reloc_count
;
2307 coff_sym_filepos(abfd
)
2310 return obj_sym_filepos(abfd
);
2314 #ifndef coff_reloc16_estimate
2315 #define coff_reloc16_estimate dummy_reloc16_estimate
2318 dummy_reloc16_estimate(input_section
, symbols
, reloc
, shrink
)
2319 asection
*input_section
;
2322 unsigned int shrink
;
2329 #ifndef coff_reloc16_extra_cases
2330 #define coff_reloc16_extra_cases dummy_reloc16_extra_cases
2331 /* This works even if abort is not declared in any header file. */
2333 dummy_reloc16_extra_cases (abfd
, seclet
, reloc
, data
, src_ptr
, dst_ptr
)
2335 struct bfd_seclet
*seclet
;
2338 unsigned int *src_ptr
;
2339 unsigned int *dst_ptr
;
2341 fprintf(stderr
, "%s\n", reloc
->howto
->name
);
2346 static CONST bfd_coff_backend_data bfd_coff_std_swap_table
= {
2347 coff_swap_aux_in
, coff_swap_sym_in
, coff_swap_lineno_in
,
2348 coff_swap_aux_out
, coff_swap_sym_out
,
2349 coff_swap_lineno_out
, coff_swap_reloc_out
,
2350 coff_swap_filehdr_out
, coff_swap_aouthdr_out
,
2351 coff_swap_scnhdr_out
,
2352 FILHSZ
, AOUTSZ
, SCNHSZ
, SYMESZ
, AUXESZ
, LINESZ
,
2353 #ifdef COFF_LONG_FILENAMES
2358 coff_swap_filehdr_in
, coff_swap_aouthdr_in
, coff_swap_scnhdr_in
,
2359 coff_bad_format_hook
, coff_set_arch_mach_hook
, coff_mkobject_hook
,
2360 styp_to_sec_flags
, coff_make_section_hook
, coff_set_alignment_hook
,
2361 coff_slurp_symbol_table
, symname_in_debug_hook
,
2362 coff_reloc16_extra_cases
, coff_reloc16_estimate
2365 #define coff_core_file_failing_command _bfd_dummy_core_file_failing_command
2366 #define coff_core_file_failing_signal _bfd_dummy_core_file_failing_signal
2367 #define coff_core_file_matches_executable_p _bfd_dummy_core_file_matches_executable_p
2368 #define coff_slurp_armap bfd_slurp_coff_armap
2369 #define coff_slurp_extended_name_table _bfd_slurp_extended_name_table
2370 #define coff_truncate_arname bfd_dont_truncate_arname
2371 #define coff_openr_next_archived_file bfd_generic_openr_next_archived_file
2372 #define coff_generic_stat_arch_elt bfd_generic_stat_arch_elt
2373 #define coff_get_section_contents bfd_generic_get_section_contents
2374 #define coff_close_and_cleanup bfd_generic_close_and_cleanup
2376 #define coff_bfd_debug_info_start bfd_void
2377 #define coff_bfd_debug_info_end bfd_void
2378 #define coff_bfd_debug_info_accumulate \
2379 (void (*) PARAMS ((bfd *, struct sec *))) bfd_void
2380 #define coff_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
2381 #define coff_bfd_relax_section bfd_generic_relax_section
2382 #define coff_bfd_seclet_link bfd_generic_seclet_link
2383 #define coff_bfd_reloc_type_lookup \
2384 ((CONST struct reloc_howto_struct *(*) PARAMS ((bfd *, bfd_reloc_code_real_type))) bfd_nullvoidptr)