1 /* Support for the generic parts of most COFF variants, for BFD.
2 Copyright 1990, 1991, 1992 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 difference between formats are the sizes and
32 alignments of fields in structures on disk, and the occasional
35 Coff in all its varieties is implimented 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 @code{coff-m88k.c}. This file @code{#include}s
39 @code{coff/m88k.h} which defines the external structure of the
40 coff format for the 88k, and @code{coff/internal.h} which
41 defines the internal structure. @code{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 @code{coff-i960.c}. This file has the same structure as
47 @code{coff-m88k.c}, except that it includes @code{coff/i960.h}
48 rather than @code{coff-m88k.h}.
51 Porting To A New Version of Coff
53 The recommended method is to select from the existing
54 implimentations the version of coff which is most like the one
55 you want to use, for our purposes, we'll say that i386 coff is
56 the one you select, and that your coff flavour is called foo.
57 Copy the @code{i386coff.c} to @code{foocoff.c}, copy
58 @code{../include/coff/i386.h} to @code{../include/coff/foo.h}
59 and add the lines to @code{targets.c} and @code{Makefile.in}
60 so that your new back end is used. Alter the shapes of the
61 structures in @code{../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 @code{coff/internal.h} and
64 @code{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 @code{objdump} from the @code{binutils} directory,
68 and making sure that its version of what's going on at your
69 host systems 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 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 descibing the external layout of the structures. There is also
116 an internal description of the coff layout (in
117 @code{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 @code{coffcode.h}. Eg 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 for 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. This 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 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 changes 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 in 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 was born, and on output
194 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. Note that 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 to an index into the symbol table of the symbol
233 This routine runs through the symbol table and patches up the
234 symbols from their internal form into the coff way, calls the
235 bit twiddlers and writes out the tabel to the file.
244 The hidden information for an asymbol is described in a
245 coff_ptr_struct, which is typedefed to a combined_entry_type
249 .typedef struct coff_ptr_struct
252 . {* Remembers the offset from the first symbol in the file for
253 . this symbol. Generated by coff_renumber_symbols. *}
254 .unsigned int offset;
256 . {* Should the tag field of this symbol be renumbered.
257 . Created by coff_pointerize_aux. *}
260 . {* Should the endidx field of this symbol be renumbered.
261 . Created by coff_pointerize_aux. *}
264 . {* The container for the symbol structure as read and translated
268 . union internal_auxent auxent;
269 . struct internal_syment syment;
271 .} combined_entry_type;
274 .{* Each canonical asymbol really looks like this: *}
276 .typedef struct coff_symbol_struct
278 . {* The actual symbol which the rest of BFD works with *}
281 . {* A pointer to the hidden information for this symbol *}
282 .combined_entry_type *native;
284 . {* A pointer to the linenumber information for this symbol *}
285 .struct lineno_cache_entry *lineno;
287 . {* Have the line numbers been relocated yet ? *}
288 .boolean done_lineno;
295 #include "coffswap.h"
297 /* void warning(); */
300 * Return a word with STYP_* (scnhdr.s_flags) flags set to represent the
301 * incoming SEC_* flags. The inverse of this function is styp_to_sec_flags().
302 * NOTE: If you add to/change this routine, you should mirror the changes
303 * in styp_to_sec_flags().
306 DEFUN(sec_to_styp_flags, (sec_name, sec_flags),
307 CONST char * sec_name AND
312 if (!strcmp(sec_name, _TEXT)) {
313 return((long)STYP_TEXT);
314 } else if (!strcmp(sec_name, _DATA)) {
315 return((long)STYP_DATA);
317 } else if (!strcmp(sec_name, ".data2")) {
318 return((long)STYP_DATA);
319 #endif /* TWO_DATA_SECS */
320 } else if (!strcmp(sec_name, _BSS)) {
321 return((long)STYP_BSS);
323 } else if (!strcmp(sec_name, _COMMENT)) {
324 return((long)STYP_INFO);
325 #endif /* _COMMENT */
327 } else if (!strcmp(sec_name, _LIB)) {
328 return((long)STYP_LIB);
332 /* Try and figure out what it should be */
333 if (sec_flags & SEC_CODE) styp_flags = STYP_TEXT;
334 if (sec_flags & SEC_DATA) styp_flags = STYP_DATA;
335 else if (sec_flags & SEC_READONLY)
336 #ifdef STYP_LIT /* 29k readonly text/data section */
337 styp_flags = STYP_LIT;
339 styp_flags = STYP_TEXT;
340 #endif /* STYP_LIT */
341 else if (sec_flags & SEC_LOAD) styp_flags = STYP_TEXT;
343 if (styp_flags == 0) styp_flags = STYP_BSS;
346 if (sec_flags & SEC_NEVER_LOAD)
347 styp_flags |= STYP_NOLOAD;
353 * Return a word with SEC_* flags set to represent the incoming
354 * STYP_* flags (from scnhdr.s_flags). The inverse of this
355 * function is sec_to_styp_flags().
356 * NOTE: If you add to/change this routine, you should mirror the changes
357 * in sec_to_styp_flags().
360 DEFUN(styp_to_sec_flags, (abfd, hdr),
364 struct internal_scnhdr *internal_s = (struct internal_scnhdr *) hdr;
365 long styp_flags = internal_s->s_flags;
366 flagword sec_flags=0;
369 if (styp_flags & STYP_NOLOAD)
371 sec_flags |= SEC_NEVER_LOAD;
373 #endif /* STYP_NOLOAD */
375 /* For 386 COFF, at least, an unloadable text or data section is
376 actually a shared library section. */
377 if (styp_flags & STYP_TEXT)
379 if (sec_flags & SEC_NEVER_LOAD)
380 sec_flags |= SEC_CODE | SEC_SHARED_LIBRARY;
382 sec_flags |= SEC_CODE | SEC_LOAD | SEC_ALLOC;
384 else if (styp_flags & STYP_DATA)
386 if (sec_flags & SEC_NEVER_LOAD)
387 sec_flags |= SEC_DATA | SEC_SHARED_LIBRARY;
389 sec_flags |= SEC_DATA | SEC_LOAD | SEC_ALLOC;
391 else if (styp_flags & STYP_BSS)
393 sec_flags |= SEC_ALLOC;
395 else if (styp_flags & STYP_INFO)
397 sec_flags |= SEC_NEVER_LOAD;
401 sec_flags |= SEC_ALLOC | SEC_LOAD;
404 #ifdef STYP_LIT /* A29k readonly text/data section type */
405 if ((styp_flags & STYP_LIT) == STYP_LIT)
407 sec_flags = (SEC_LOAD | SEC_ALLOC | SEC_READONLY);
409 #endif /* STYP_LIT */
410 #ifdef STYP_OTHER_LOAD /* Other loaded sections */
411 if (styp_flags & STYP_OTHER_LOAD)
413 sec_flags = (SEC_LOAD | SEC_ALLOC);
415 #endif /* STYP_SDATA */
420 #define get_index(symbol) ((int) (symbol)->udata)
424 bfd_coff_backend_data
428 Special entry points for gdb to swap in coff symbol table parts
431 . void (*_bfd_coff_swap_aux_in) PARAMS ((
438 . void (*_bfd_coff_swap_sym_in) PARAMS ((
443 . void (*_bfd_coff_swap_lineno_in) PARAMS ((
449 Special entry points for gas to swap coff parts
451 . unsigned int (*_bfd_coff_swap_aux_out) PARAMS ((
458 . unsigned int (*_bfd_coff_swap_sym_out) PARAMS ((
463 . unsigned int (*_bfd_coff_swap_lineno_out) PARAMS ((
468 . unsigned int (*_bfd_coff_swap_reloc_out) PARAMS ((
473 . unsigned int (*_bfd_coff_swap_filehdr_out) PARAMS ((
478 . unsigned int (*_bfd_coff_swap_aouthdr_out) PARAMS ((
483 . unsigned int (*_bfd_coff_swap_scnhdr_out) PARAMS ((
489 Special entry points for generic COFF routines to call target
490 dependent COFF routines
492 . unsigned int _bfd_filhsz;
493 . unsigned int _bfd_aoutsz;
494 . unsigned int _bfd_scnhsz;
495 . unsigned int _bfd_symesz;
496 . unsigned int _bfd_auxesz;
497 . unsigned int _bfd_linesz;
498 . boolean _bfd_coff_long_filenames;
499 . void (*_bfd_coff_swap_filehdr_in) PARAMS ((
503 . void (*_bfd_coff_swap_aouthdr_in) PARAMS ((
507 . void (*_bfd_coff_swap_scnhdr_in) PARAMS ((
511 . boolean (*_bfd_coff_bad_format_hook) PARAMS ((
513 . PTR internal_filehdr));
514 . boolean (*_bfd_coff_set_arch_mach_hook) PARAMS ((
516 . PTR internal_filehdr));
517 . PTR (*_bfd_coff_mkobject_hook) PARAMS ((
519 . PTR internal_filehdr));
520 . flagword (*_bfd_styp_to_sec_flags_hook) PARAMS ((
522 . PTR internal_scnhdr));
523 . asection *(*_bfd_make_section_hook) PARAMS ((
526 . void (*_bfd_set_alignment_hook) PARAMS ((
529 . PTR internal_scnhdr));
530 . boolean (*_bfd_coff_slurp_symbol_table) PARAMS ((
532 . boolean (*_bfd_coff_symname_in_debug) PARAMS ((
534 . struct internal_syment *sym));
535 . void (*_bfd_coff_reloc16_extra_cases) PARAMS ((
537 . bfd_seclet_type *seclet,
540 . unsigned int *src_ptr,
541 . unsigned int *dst_ptr));
542 .} bfd_coff_backend_data;
544 .#define coff_backend_info(abfd) ((bfd_coff_backend_data *) (abfd)->xvec->backend_data)
546 .#define bfd_coff_swap_aux_in(a,e,t,c,i) \
547 . ((coff_backend_info (a)->_bfd_coff_swap_aux_in) (a,e,t,c,i))
549 .#define bfd_coff_swap_sym_in(a,e,i) \
550 . ((coff_backend_info (a)->_bfd_coff_swap_sym_in) (a,e,i))
552 .#define bfd_coff_swap_lineno_in(a,e,i) \
553 . ((coff_backend_info ( a)->_bfd_coff_swap_lineno_in) (a,e,i))
555 .#define bfd_coff_swap_reloc_out(abfd, i, o) \
556 . ((coff_backend_info (abfd)->_bfd_coff_swap_reloc_out) (abfd, i, o))
558 .#define bfd_coff_swap_lineno_out(abfd, i, o) \
559 . ((coff_backend_info (abfd)->_bfd_coff_swap_lineno_out) (abfd, i, o))
561 .#define bfd_coff_swap_aux_out(abfd, i, t,c,o) \
562 . ((coff_backend_info (abfd)->_bfd_coff_swap_aux_out) (abfd, i,t,c, o))
564 .#define bfd_coff_swap_sym_out(abfd, i,o) \
565 . ((coff_backend_info (abfd)->_bfd_coff_swap_sym_out) (abfd, i, o))
567 .#define bfd_coff_swap_scnhdr_out(abfd, i,o) \
568 . ((coff_backend_info (abfd)->_bfd_coff_swap_scnhdr_out) (abfd, i, o))
570 .#define bfd_coff_swap_filehdr_out(abfd, i,o) \
571 . ((coff_backend_info (abfd)->_bfd_coff_swap_filehdr_out) (abfd, i, o))
573 .#define bfd_coff_swap_aouthdr_out(abfd, i,o) \
574 . ((coff_backend_info (abfd)->_bfd_coff_swap_aouthdr_out) (abfd, i, o))
576 .#define bfd_coff_filhsz(abfd) (coff_backend_info (abfd)->_bfd_filhsz)
577 .#define bfd_coff_aoutsz(abfd) (coff_backend_info (abfd)->_bfd_aoutsz)
578 .#define bfd_coff_scnhsz(abfd) (coff_backend_info (abfd)->_bfd_scnhsz)
579 .#define bfd_coff_symesz(abfd) (coff_backend_info (abfd)->_bfd_symesz)
580 .#define bfd_coff_auxesz(abfd) (coff_backend_info (abfd)->_bfd_auxesz)
581 .#define bfd_coff_linesz(abfd) (coff_backend_info (abfd)->_bfd_linesz)
582 .#define bfd_coff_long_filenames(abfd) (coff_backend_info (abfd)->_bfd_coff_long_filenames)
583 .#define bfd_coff_swap_filehdr_in(abfd, i,o) \
584 . ((coff_backend_info (abfd)->_bfd_coff_swap_filehdr_in) (abfd, i, o))
586 .#define bfd_coff_swap_aouthdr_in(abfd, i,o) \
587 . ((coff_backend_info (abfd)->_bfd_coff_swap_aouthdr_in) (abfd, i, o))
589 .#define bfd_coff_swap_scnhdr_in(abfd, i,o) \
590 . ((coff_backend_info (abfd)->_bfd_coff_swap_scnhdr_in) (abfd, i, o))
592 .#define bfd_coff_bad_format_hook(abfd, filehdr) \
593 . ((coff_backend_info (abfd)->_bfd_coff_bad_format_hook) (abfd, filehdr))
595 .#define bfd_coff_set_arch_mach_hook(abfd, filehdr)\
596 . ((coff_backend_info (abfd)->_bfd_coff_set_arch_mach_hook) (abfd, filehdr))
597 .#define bfd_coff_mkobject_hook(abfd, filehdr)\
598 . ((coff_backend_info (abfd)->_bfd_coff_mkobject_hook) (abfd, filehdr))
600 .#define bfd_coff_styp_to_sec_flags_hook(abfd, scnhdr)\
601 . ((coff_backend_info (abfd)->_bfd_styp_to_sec_flags_hook) (abfd, scnhdr))
603 .#define bfd_coff_make_section_hook(abfd, name)\
604 . ((coff_backend_info (abfd)->_bfd_make_section_hook) (abfd, name))
606 .#define bfd_coff_set_alignment_hook(abfd, sec, scnhdr)\
607 . ((coff_backend_info (abfd)->_bfd_set_alignment_hook) (abfd, sec, scnhdr))
609 .#define bfd_coff_slurp_symbol_table(abfd)\
610 . ((coff_backend_info (abfd)->_bfd_coff_slurp_symbol_table) (abfd))
612 .#define bfd_coff_symname_in_debug(abfd, sym)\
613 . ((coff_backend_info (abfd)->_bfd_coff_symname_in_debug) (abfd, sym))
615 .#define bfd_coff_reloc16_extra_cases(abfd, seclet, reloc, data, src_ptr, dst_ptr)\
616 . ((coff_backend_info (abfd)->_bfd_coff_reloc16_extra_cases)\
617 . (abfd, seclet, reloc, data, src_ptr, dst_ptr))
621 /* See whether the magic number matches. */
624 DEFUN(coff_bad_format_hook, (abfd, filehdr),
628 struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr;
630 if (BADMAG (*internal_f))
633 /* if the optional header is NULL or not the correct size then
634 quit; the only difference I can see between m88k dgux headers (MC88DMAGIC)
635 and Intel 960 readwrite headers (I960WRMAGIC) is that the
636 optional header is of a different size.
638 But the mips keeps extra stuff in it's opthdr, so dont check
642 #if defined(M88) || defined(I960)
643 if (internal_f->f_opthdr != 0 && AOUTSZ != internal_f->f_opthdr)
651 DEFUN (coff_make_section_hook, (abfd, name),
656 /* On SCO a file created by the Microsoft assembler can have two
657 .data sections. We use .data2 for the second one. */
658 if (strcmp (name, _DATA) == 0)
659 return bfd_make_section (abfd, ".data2");
661 return (asection *) NULL;
665 initialize a section structure with information peculiar to this
666 particular implementation of coff
670 DEFUN(coff_new_section_hook,(abfd, section),
674 section->alignment_power = abfd->xvec->align_power_min;
675 /* Allocate aux records for section symbols, to store size and
678 @@ Shouldn't use constant multiplier here! */
679 coffsymbol (section->symbol)->native =
680 (combined_entry_type *) bfd_zalloc (abfd,
681 sizeof (combined_entry_type) * 10);
688 /* Set the alignment of a BFD section. */
691 DEFUN (coff_set_alignment_hook, (abfd, section, scnhdr),
693 asection *section AND
696 struct internal_scnhdr *hdr = (struct internal_scnhdr *) scnhdr;
699 for (i = 0; i < 32; i++)
700 if ((1 << i) >= hdr->s_align)
702 section->alignment_power = i;
707 #define coff_set_alignment_hook \
708 ((void (*) PARAMS ((bfd *, asection *, PTR))) bfd_void)
713 DEFUN(coff_mkobject,(abfd),
716 coff_data_type *coff;
718 abfd->tdata.coff_obj_data = (struct coff_tdata *)bfd_zalloc (abfd,sizeof(coff_data_type));
719 if (abfd->tdata.coff_obj_data == 0){
720 bfd_error = no_memory;
723 coff = coff_data (abfd);
724 coff->symbols = (coff_symbol_type *) NULL;
725 coff->conversion_table = (unsigned int *) NULL;
726 coff->raw_syments = (struct coff_ptr_struct *) NULL;
727 coff->raw_linenos = (struct lineno *) NULL;
729 /* make_abs_section(abfd);*/
733 /* Create the COFF backend specific information. */
736 DEFUN(coff_mkobject_hook,(abfd, filehdr),
740 struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr;
741 coff_data_type *coff;
743 if (coff_mkobject (abfd) == false)
746 coff = coff_data (abfd);
748 coff->sym_filepos = internal_f->f_symptr;
749 coff->flags = internal_f->f_flags;
751 /* These members communicate important constants about the symbol
752 table to GDB's symbol-reading code. These `constants'
753 unfortunately vary among coff implementations... */
754 coff->local_n_btmask = N_BTMASK;
755 coff->local_n_btshft = N_BTSHFT;
756 coff->local_n_tmask = N_TMASK;
757 coff->local_n_tshift = N_TSHIFT;
758 coff->local_symesz = SYMESZ;
759 coff->local_auxesz = AUXESZ;
760 coff->local_linesz = LINESZ;
765 /* Determine the machine architecture and type. FIXME: This is target
766 dependent because the magic numbers are defined in the target
767 dependent header files. But there is no particular need for this.
768 If the magic numbers were moved to a separate file, this function
769 would be target independent and would also be much more successful
770 at linking together COFF files for different architectures. */
773 DEFUN (coff_set_arch_mach_hook, (abfd, filehdr),
778 enum bfd_architecture arch;
779 struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr;
782 switch (internal_f->f_magic) {
786 case I386AIXMAGIC: /* Danbury PS/2 AIX C Compiler */
788 arch = bfd_arch_i386;
793 #ifdef A29K_MAGIC_BIG
795 case A29K_MAGIC_LITTLE:
796 arch = bfd_arch_a29k;
805 arch = bfd_arch_mips;
813 arch = bfd_arch_m68k;
821 arch = bfd_arch_m88k;
828 switch (internal_f->f_flags & F_MACHMASK)
831 machine = bfd_mach_z8001;
834 machine = bfd_mach_z8002;
845 arch = bfd_arch_i960;
846 switch (F_I960TYPE & internal_f->f_flags)
850 machine = bfd_mach_i960_core;
853 machine = bfd_mach_i960_kb_sb;
856 machine = bfd_mach_i960_mc;
859 machine = bfd_mach_i960_xa;
862 machine = bfd_mach_i960_ca;
865 machine = bfd_mach_i960_ka_sa;
876 arch = bfd_arch_rs6000;
883 arch = bfd_arch_we32k;
890 arch = bfd_arch_h8300;
895 default: /* Unreadable input file type */
896 arch = bfd_arch_obscure;
900 bfd_default_set_arch_mach(abfd, arch, machine);
904 #ifdef SYMNAME_IN_DEBUG
907 DEFUN (symname_in_debug_hook, (abfd, sym),
909 struct internal_syment *sym)
911 return SYMNAME_IN_DEBUG (sym) ? true : false;
916 #define symname_in_debug_hook \
917 (boolean (*) PARAMS ((bfd *, struct internal_syment *))) bfd_false
925 To write relocations, all the back end does is step though the
926 canonical relocation table, and create an
927 @code{internal_reloc}. The symbol index to use is removed from
928 the @code{offset} field in the symbol table supplied, the
929 address comes directly from the sum of the section base
930 address and the relocation offset and the type is dug directly
931 from the howto field. Then the @code{internal_reloc} is
932 swapped into the shape of an @code{external_reloc} and written
938 DEFUN(coff_write_relocs,(abfd),
942 for (s = abfd->sections; s != (asection *) NULL; s = s->next) {
944 struct external_reloc dst;
946 arelent **p = s->orelocation;
947 bfd_seek(abfd, s->rel_filepos, SEEK_SET);
948 for (i = 0; i < s->reloc_count; i++) {
949 struct internal_reloc n;
951 memset((PTR)&n, 0, sizeof(n));
953 n.r_vaddr = q->address + s->vma;
954 /* The 29k const/consth reloc pair is a real kludge - the consth
955 part doesn't have a symbol - it has an offset. So rebuilt
958 if (q->howto->type == R_IHCONST)
959 n.r_symndx = q->addend;
966 if (q->sym_ptr_ptr == bfd_abs_section.symbol_ptr_ptr)
968 /* This is a relocation relative to the absolute symbol */
973 n.r_symndx = get_index((*(q->sym_ptr_ptr)));
974 /* Take notice if the symbol reloc points to a symbol we don't have
975 in our symbol table. What should we do for this?? */
976 if (n.r_symndx > obj_conv_table_size (abfd))
984 /* Work out reloc type from what is required */
985 SELECT_RELOC(n.r_type, q->howto);
987 n.r_type = q->howto->type;
989 coff_swap_reloc_out(abfd, &n, &dst);
990 bfd_write((PTR) &dst, 1, RELSZ, abfd);
995 /* Set flags and magic number of a coff file from architecture and machine
996 type. Result is true if we can represent the arch&type, false if not. */
999 DEFUN(coff_set_flags,(abfd, magicp, flagsp),
1001 unsigned *magicp AND
1002 unsigned short *flagsp)
1004 switch (bfd_get_arch(abfd)) {
1008 switch (bfd_get_mach(abfd))
1010 case bfd_mach_z8001:
1013 case bfd_mach_z8002:
1027 *magicp = I960ROMAGIC;
1029 ((bfd_get_file_flags(abfd) & WP_TEXT) ? I960ROMAGIC :
1030 I960RWMAGIC); FIXME???
1032 switch (bfd_get_mach(abfd)) {
1033 case bfd_mach_i960_core:
1036 case bfd_mach_i960_kb_sb:
1039 case bfd_mach_i960_mc:
1042 case bfd_mach_i960_xa:
1045 case bfd_mach_i960_ca:
1048 case bfd_mach_i960_ka_sa:
1061 *magicp = MIPS_MAGIC_2;
1067 *magicp = I386MAGIC;
1073 *magicp = MC68MAGIC;
1080 *magicp = MC88OMAGIC;
1085 case bfd_arch_h8300:
1086 *magicp = H8300MAGIC;
1090 #ifdef A29K_MAGIC_BIG
1092 if (abfd->xvec->byteorder_big_p)
1093 *magicp = A29K_MAGIC_BIG;
1095 *magicp = A29K_MAGIC_LITTLE;
1101 case bfd_arch_we32k:
1102 *magicp = WE32KMAGIC;
1108 case bfd_arch_rs6000:
1109 *magicp = U802TOCMAGIC;
1114 default: /* Unknown architecture */
1115 /* return false; -- fall through to "return false" below, to avoid
1116 "statement never reached" errors on the one below. */
1125 DEFUN(coff_set_arch_mach,(abfd, arch, machine),
1127 enum bfd_architecture arch AND
1128 unsigned long machine)
1131 unsigned short dummy2;
1132 bfd_default_set_arch_mach(abfd, arch, machine);
1134 if (arch != bfd_arch_unknown &&
1135 coff_set_flags(abfd, &dummy1, &dummy2) != true)
1136 return false; /* We can't represent this type */
1137 return true; /* We're easy ... */
1141 /* Calculate the file position for each section. */
1144 DEFUN(coff_compute_section_file_positions,(abfd),
1148 asection *previous = (asection *)NULL;
1149 file_ptr sofar = FILHSZ;
1151 if (bfd_get_start_address(abfd))
1153 /* A start address may have been added to the original file. In this
1154 case it will need an optional header to record it. */
1155 abfd->flags |= EXEC_P;
1158 if (abfd->flags & EXEC_P)
1161 sofar += abfd->section_count * SCNHSZ;
1162 for (current = abfd->sections;
1163 current != (asection *)NULL;
1164 current = current->next) {
1166 /* Only deal with sections which have contents */
1167 if (!(current->flags & SEC_HAS_CONTENTS))
1170 /* Align the sections in the file to the same boundary on
1171 which they are aligned in virtual memory. I960 doesn't
1172 do this (FIXME) so we can stay in sync with Intel. 960
1173 doesn't yet page from files... */
1176 /* make sure this section is aligned on the right boundary - by
1177 padding the previous section up if necessary */
1180 sofar = BFD_ALIGN(sofar, 1 << current->alignment_power);
1181 if (previous != (asection *)NULL) {
1182 previous->_raw_size += sofar - old_sofar;
1187 /* FIXME, in demand paged files, the low order bits of the file
1188 offset must match the low order bits of the virtual address.
1189 "Low order" is apparently implementation defined. Add code
1190 here to round sofar up to match the virtual address. */
1192 current->filepos = sofar;
1194 sofar += current->_raw_size;
1196 /* make sure that this section is of the right size too */
1198 sofar = BFD_ALIGN(sofar, 1 << current->alignment_power);
1199 current->_raw_size += sofar - old_sofar ;
1204 obj_relocbase(abfd) = sofar;
1207 /* If .file, .text, .data, .bss symbols are missing, add them. */
1208 /* @@ Should we only be adding missing symbols, or overriding the aux
1209 values for existing section symbols? */
1211 coff_add_missing_symbols (abfd)
1214 unsigned int nsyms = bfd_get_symcount (abfd);
1215 asymbol **sympp = abfd->outsymbols;
1218 int need_text = 1, need_data = 1, need_bss = 1, need_file = 1;
1220 for (i = 0; i < nsyms; i++)
1222 coff_symbol_type *csym = coff_symbol_from (abfd, sympp[i]);
1226 /* only do this if there is a coff representation of the input
1228 if (csym->native && csym->native->u.syment.n_sclass == C_FILE)
1233 name = csym->symbol.name;
1236 if (!strcmp (name, _TEXT))
1238 else if (!strcmp (name, _DATA))
1240 else if (!strcmp (name, _BSS))
1244 /* Now i == bfd_get_symcount (abfd). */
1245 /* @@ For now, don't deal with .file symbol. */
1248 if (!need_text && !need_data && !need_bss && !need_file)
1250 nsyms += need_text + need_data + need_bss + need_file;
1251 sympp2 = (asymbol**) bfd_alloc_by_size_t (abfd, nsyms * sizeof (asymbol *));
1252 memcpy (sympp2, sympp, i * sizeof (asymbol *));
1255 /* @@ Generate fake .file symbol, in sympp2[i], and increment i. */
1259 sympp2[i++] = coff_section_symbol (abfd, _TEXT);
1261 sympp2[i++] = coff_section_symbol (abfd, _DATA);
1263 sympp2[i++] = coff_section_symbol (abfd, _BSS);
1264 BFD_ASSERT (i == nsyms);
1265 bfd_set_symtab (abfd, sympp2, nsyms);
1271 DEFUN(coff_write_object_contents,(abfd),
1277 boolean hasrelocs = false;
1278 boolean haslinno = false;
1279 file_ptr reloc_base;
1280 file_ptr lineno_base;
1284 unsigned long reloc_size = 0;
1285 unsigned long lnno_size = 0;
1286 asection *text_sec = NULL;
1287 asection *data_sec = NULL;
1288 asection *bss_sec = NULL;
1290 struct internal_filehdr internal_f;
1291 struct internal_aouthdr internal_a;
1294 bfd_error = system_call_error;
1295 /* Number the output sections, starting from one on the first section
1296 with a name which doesn't start with a *.
1297 @@ The code doesn't make this check. Is it supposed to be done,
1300 for (current = abfd->sections; current != (asection *)NULL;
1301 current = current->next)
1303 current->target_index = count;
1307 if(abfd->output_has_begun == false) {
1308 coff_compute_section_file_positions(abfd);
1311 if (abfd->sections != (asection *)NULL) {
1312 scn_base = abfd->sections->filepos;
1317 if (bfd_seek(abfd, scn_base, SEEK_SET) != 0)
1319 reloc_base = obj_relocbase(abfd);
1321 /* Make a pass through the symbol table to count line number entries and
1322 put them into the correct asections */
1324 coff_count_linenumbers(abfd);
1325 data_base = scn_base;
1327 /* Work out the size of the reloc and linno areas */
1329 for (current = abfd->sections; current != NULL; current =
1332 /* We give section headers to +ve indexes */
1333 if (current->target_index > 0)
1336 reloc_size += current->reloc_count * RELSZ;
1337 lnno_size += current->lineno_count * LINESZ;
1338 data_base += SCNHSZ;
1343 lineno_base = reloc_base + reloc_size;
1344 sym_base = lineno_base + lnno_size;
1346 /* Indicate in each section->line_filepos its actual file address */
1347 for (current = abfd->sections; current != NULL; current =
1350 if (current->target_index > 0)
1353 if (current->lineno_count) {
1354 current->line_filepos = lineno_base;
1355 current->moving_line_filepos = lineno_base;
1356 lineno_base += current->lineno_count * LINESZ;
1359 current->line_filepos = 0;
1361 if (current->reloc_count) {
1362 current->rel_filepos = reloc_base;
1363 reloc_base += current->reloc_count * RELSZ;
1366 current->rel_filepos = 0;
1373 /* Write section headers to the file. */
1374 internal_f.f_nscns = 0;
1376 (file_ptr) ((abfd->flags & EXEC_P) ?
1377 (FILHSZ + AOUTSZ) : FILHSZ),
1382 unsigned int pad = abfd->flags & D_PAGED ? data_base : 0;
1384 unsigned int pad = 0;
1386 for (current = abfd->sections;
1388 current = current->next) {
1389 struct internal_scnhdr section;
1390 if (current->target_index > 0)
1392 internal_f.f_nscns ++;
1393 strncpy(&(section.s_name[0]), current->name, 8);
1395 /* Always set s_vaddr of .lib to 0. This is right for SVR3.2
1396 Ian Taylor <ian@cygnus.com>. */
1397 if (strcmp (current->name, _LIB) == 0)
1398 section.s_vaddr = 0;
1401 section.s_vaddr = current->vma + pad;
1402 section.s_paddr = current->vma + pad;
1403 section.s_size = current->_raw_size - pad;
1405 If this section has no size or is unloadable then the scnptr
1408 if (current->_raw_size - pad == 0 ||
1409 (current->flags & (SEC_LOAD | SEC_HAS_CONTENTS)) == 0) {
1410 section.s_scnptr = 0;
1413 section.s_scnptr = current->filepos;
1415 section.s_relptr = current->rel_filepos;
1416 section.s_lnnoptr = current->line_filepos;
1417 section.s_nreloc = current->reloc_count;
1418 section.s_nlnno = current->lineno_count;
1419 if (current->reloc_count != 0)
1421 if (current->lineno_count != 0)
1424 section.s_flags = sec_to_styp_flags(current->name,current->flags);
1426 if (!strcmp(current->name, _TEXT)) {
1428 } else if (!strcmp(current->name, _DATA)) {
1430 #ifdef TWO_DATA_SECS
1431 } else if (!strcmp(current->name, ".data2")) {
1433 #endif /* TWO_DATA_SECS */
1434 } else if (!strcmp(current->name, _BSS)) {
1439 section.s_align = (current->alignment_power
1440 ? 1 << current->alignment_power
1447 coff_swap_scnhdr_out(abfd, §ion, &buff);
1448 bfd_write((PTR) (&buff), 1, SCNHSZ, abfd);
1458 /* OK, now set up the filehdr... */
1460 /* Don't include the internal abs section in the section count */
1463 We will NOT put a fucking timestamp in the header here. Every time you
1464 put it back, I will come in and take it out again. I'm sorry. This
1465 field does not belong here. We fill it with a 0 so it compares the
1466 same but is not a reasonable time. -- gnu@cygnus.com
1468 internal_f.f_timdat = 0;
1470 if (bfd_get_symcount(abfd) != 0)
1471 internal_f.f_symptr = sym_base;
1473 internal_f.f_symptr = 0;
1475 internal_f.f_flags = 0;
1477 if (abfd->flags & EXEC_P)
1478 internal_f.f_opthdr = AOUTSZ;
1480 internal_f.f_opthdr = 0;
1483 internal_f.f_flags |= F_RELFLG;
1485 internal_f.f_flags |= F_LNNO;
1486 if (0 == bfd_get_symcount(abfd))
1487 internal_f.f_flags |= F_LSYMS;
1488 if (abfd->flags & EXEC_P)
1489 internal_f.f_flags |= F_EXEC;
1491 if (!abfd->xvec->byteorder_big_p)
1492 internal_f.f_flags |= F_AR32WR;
1494 internal_f.f_flags |= F_AR32W;
1497 FIXME, should do something about the other byte orders and
1501 /* Set up architecture-dependent stuff */
1503 { unsigned int magic = 0;
1504 unsigned short flags = 0;
1505 coff_set_flags(abfd, &magic, &flags);
1506 internal_f.f_magic = magic;
1507 internal_f.f_flags |= flags;
1508 /* ...and the "opt"hdr... */
1511 # ifdef ULTRA3 /* NYU's machine */
1512 /* FIXME: This is a bogus check. I really want to see if there
1513 * is a .shbss or a .shdata section, if so then set the magic
1514 * number to indicate a shared data executable.
1516 if (internal_f.f_nscns >= 7)
1517 internal_a.magic = SHMAGIC; /* Shared magic */
1519 # endif /* ULTRA3 */
1520 internal_a.magic = NMAGIC; /* Assume separate i/d */
1521 #define __A_MAGIC_SET__
1524 internal_a.magic = (magic == I960ROMAGIC ? NMAGIC : OMAGIC);
1525 #define __A_MAGIC_SET__
1528 #define __A_MAGIC_SET__
1529 internal_a.magic = PAGEMAGICBCS;
1532 #if M68 || MIPS || WE32K
1533 #define __A_MAGIC_SET__
1534 /* Never was anything here for the 68k */
1535 #endif /* M68 || MIPS || WE32K */
1538 # define __A_MAGIC_SET__
1539 internal_a.magic = ZMAGIC;
1543 #define __A_MAGIC_SET__
1544 internal_a.magic = (abfd->flags & D_PAGED)? RS6K_AOUTHDR_ZMAGIC:
1545 (abfd->flags & WP_TEXT)? RS6K_AOUTHDR_NMAGIC:
1546 RS6K_AOUTHDR_OMAGIC;
1549 #ifndef __A_MAGIC_SET__
1550 # include "Your aouthdr magic number is not being set!"
1552 # undef __A_MAGIC_SET__
1555 /* Now should write relocs, strings, syms */
1556 obj_sym_filepos(abfd) = sym_base;
1558 if (bfd_get_symcount(abfd) != 0) {
1559 coff_add_missing_symbols (abfd);
1560 coff_renumber_symbols(abfd);
1561 coff_mangle_symbols(abfd);
1562 coff_write_symbols(abfd);
1563 coff_write_linenumbers(abfd);
1564 coff_write_relocs(abfd);
1567 internal_a.tsize = bfd_get_section_size_before_reloc(text_sec);
1568 internal_a.text_start = internal_a.tsize ? text_sec->vma : 0;
1571 internal_a.dsize = bfd_get_section_size_before_reloc(data_sec);
1572 internal_a.data_start = internal_a.dsize ? data_sec->vma : 0;
1575 internal_a.bsize = bfd_get_section_size_before_reloc(bss_sec);
1578 internal_a.entry = bfd_get_start_address(abfd);
1579 internal_f.f_nsyms = bfd_get_symcount(abfd);
1581 /* now write them */
1582 if (bfd_seek(abfd, (file_ptr) 0, SEEK_SET) != 0)
1586 coff_swap_filehdr_out(abfd, (PTR)&internal_f, (PTR)&buff);
1587 bfd_write((PTR) &buff, 1, FILHSZ, abfd);
1589 if (abfd->flags & EXEC_P) {
1591 coff_swap_aouthdr_out(abfd, (PTR)&internal_a, (PTR)&buff);
1592 bfd_write((PTR) &buff, 1, AOUTSZ, abfd);
1598 DEFUN(coff_set_section_contents,(abfd, section, location, offset, count),
1603 bfd_size_type count)
1605 if (abfd->output_has_begun == false) /* set by bfd.c handler */
1606 coff_compute_section_file_positions(abfd);
1609 /* If this is a .lib section, bump the vma address so that it
1610 winds up being the number of .lib sections output. This is
1611 right for SVR3.2. Shared libraries should probably get more
1612 generic support. Ian Taylor <ian@cygnus.com>. */
1613 if (strcmp (section->name, _LIB) == 0)
1617 bfd_seek(abfd, (file_ptr) (section->filepos + offset), SEEK_SET);
1620 return (bfd_write(location, 1, count, abfd) == count) ? true : false;
1626 coff_close_and_cleanup(abfd)
1629 if (!bfd_read_p(abfd))
1630 switch (abfd->format) {
1632 if (!_bfd_write_archive_contents(abfd))
1636 if (!coff_write_object_contents(abfd))
1640 bfd_error = invalid_operation;
1644 /* We depend on bfd_close to free all the memory on the obstack. */
1645 /* FIXME if bfd_release is not using obstacks! */
1652 buy_and_read(abfd, where, seek_direction, size)
1658 PTR area = (PTR) bfd_alloc(abfd, size);
1660 bfd_error = no_memory;
1663 bfd_seek(abfd, where, seek_direction);
1664 if (bfd_read(area, 1, size, abfd) != size) {
1665 bfd_error = system_call_error;
1669 } /* buy_and_read() */
1675 Creating the linenumber table is done by reading in the entire
1676 coff linenumber table, and creating another table for internal use.
1678 A coff line number table is structured so that each function
1679 is marked as having a line number of 0. Each line within the
1680 function is an offset from the first line in the function. The
1681 base of the line number information for the table is stored in
1682 the symbol associated with the function.
1684 The information is copied from the external to the internal
1685 table, and each symbol which marks a function is marked by
1688 How does this work ?
1693 coff_slurp_line_table(abfd, asect)
1697 LINENO *native_lineno;
1698 alent *lineno_cache;
1700 BFD_ASSERT(asect->lineno == (alent *) NULL);
1702 native_lineno = (LINENO *) buy_and_read(abfd,
1703 asect->line_filepos,
1706 asect->lineno_count));
1708 (alent *) bfd_alloc(abfd, (size_t) ((asect->lineno_count + 1) * sizeof(alent)));
1709 if (lineno_cache == NULL) {
1710 bfd_error = no_memory;
1713 unsigned int counter = 0;
1714 alent *cache_ptr = lineno_cache;
1715 LINENO *src = native_lineno;
1717 while (counter < asect->lineno_count) {
1718 struct internal_lineno dst;
1719 coff_swap_lineno_in(abfd, src, &dst);
1720 cache_ptr->line_number = dst.l_lnno;
1722 if (cache_ptr->line_number == 0) {
1723 coff_symbol_type *sym =
1724 (coff_symbol_type *) (dst.l_addr.l_symndx
1725 + obj_raw_syments(abfd))->u.syment._n._n_n._n_zeroes;
1726 cache_ptr->u.sym = (asymbol *) sym;
1727 sym->lineno = cache_ptr;
1730 cache_ptr->u.offset = dst.l_addr.l_paddr
1731 - bfd_section_vma(abfd, asect);
1732 } /* If no linenumber expect a symbol index */
1738 cache_ptr->line_number = 0;
1741 asect->lineno = lineno_cache;
1742 /* FIXME, free native_lineno here, or use alloca or something. */
1744 } /* coff_slurp_line_table() */
1747 DEFUN(coff_slurp_symbol_table,(abfd),
1750 combined_entry_type *native_symbols;
1751 coff_symbol_type *cached_area;
1752 unsigned int *table_ptr;
1754 unsigned int number_of_symbols = 0;
1755 if (obj_symbols(abfd))
1757 bfd_seek(abfd, obj_sym_filepos(abfd), SEEK_SET);
1759 /* Read in the symbol table */
1760 if ((native_symbols = coff_get_normalized_symtab(abfd)) == NULL) {
1764 /* Allocate enough room for all the symbols in cached form */
1766 (coff_symbol_type *)
1767 bfd_alloc(abfd, (size_t) (bfd_get_symcount(abfd) * sizeof(coff_symbol_type)));
1769 if (cached_area == NULL) {
1770 bfd_error = no_memory;
1775 bfd_alloc(abfd, (size_t) (bfd_get_symcount(abfd) * sizeof(unsigned int)));
1777 if (table_ptr == NULL) {
1778 bfd_error = no_memory;
1783 coff_symbol_type *dst = cached_area;
1784 unsigned int last_native_index = bfd_get_symcount(abfd);
1785 unsigned int this_index = 0;
1786 while (this_index < last_native_index) {
1787 combined_entry_type *src = native_symbols + this_index;
1788 table_ptr[this_index] = number_of_symbols;
1789 dst->symbol.the_bfd = abfd;
1791 dst->symbol.name = (char *)(src->u.syment._n._n_n._n_offset);
1793 We use the native name field to point to the cached field
1795 src->u.syment._n._n_n._n_zeroes = (int) dst;
1796 dst->symbol.section = coff_section_from_bfd_index(abfd,
1797 src->u.syment.n_scnum);
1798 dst->symbol.flags = 0;
1799 dst->done_lineno = false;
1801 switch (src->u.syment.n_sclass) {
1805 dst->symbol.value = src->u.syment.n_value - dst->symbol.section->vma;
1806 dst->symbol.flags = BSF_EXPORT | BSF_GLOBAL;
1807 dst->symbol.flags |= BSF_NOT_AT_END;
1809 /* Fall through to next case */
1817 if ((src->u.syment.n_scnum) == 0) {
1818 if ((src->u.syment.n_value) == 0) {
1819 dst->symbol.section = &bfd_und_section;
1820 dst->symbol.value= 0;
1823 dst->symbol.section = &bfd_com_section;
1824 dst->symbol.value = (src->u.syment.n_value);
1829 Base the value as an index from the base of the
1833 dst->symbol.flags = BSF_EXPORT | BSF_GLOBAL;
1834 dst->symbol.value = src->u.syment.n_value - dst->symbol.section->vma;
1836 if (ISFCN((src->u.syment.n_type))) {
1838 A function ext does not go at the end of a file
1840 dst->symbol.flags |= BSF_NOT_AT_END;
1847 case C_STAT: /* static */
1849 case C_LEAFSTAT: /* static leaf procedure */
1851 case C_LABEL: /* label */
1852 if (src->u.syment.n_scnum == -2)
1853 dst->symbol.flags = BSF_DEBUGGING;
1855 dst->symbol.flags = BSF_LOCAL;
1857 Base the value as an index from the base of the section, if
1860 if (dst->symbol.section)
1861 dst->symbol.value = (src->u.syment.n_value) -
1862 dst->symbol.section->vma;
1864 dst->symbol.value = (src->u.syment.n_value) ;
1867 case C_MOS: /* member of structure */
1868 case C_EOS: /* end of structure */
1869 #ifdef NOTDEF /* C_AUTOARG has the same value */
1871 case C_GLBLREG: /* A29k-specific storage class */
1874 case C_REGPARM: /* register parameter */
1875 case C_REG: /* register variable */
1877 case C_AUTOARG: /* 960-specific storage class */
1879 case C_TPDEF: /* type definition */
1881 case C_AUTO: /* automatic variable */
1882 case C_FIELD: /* bit field */
1883 case C_ENTAG: /* enumeration tag */
1884 case C_MOE: /* member of enumeration */
1885 case C_MOU: /* member of union */
1886 case C_UNTAG: /* union tag */
1887 dst->symbol.flags = BSF_DEBUGGING;
1888 dst->symbol.value = (src->u.syment.n_value);
1891 case C_FILE: /* file name */
1892 case C_STRTAG: /* structure tag */
1894 case C_BINCL: /* beginning of include file */
1895 case C_EINCL: /* ending of include file */
1908 dst->symbol.flags = BSF_DEBUGGING;
1909 dst->symbol.value = (src->u.syment.n_value);
1912 case C_BLOCK: /* ".bb" or ".eb" */
1913 case C_FCN: /* ".bf" or ".ef" */
1914 case C_EFCN: /* physical end of function */
1915 dst->symbol.flags = BSF_LOCAL;
1917 Base the value as an index from the base of the section
1919 dst->symbol.value = (src->u.syment.n_value) - dst->symbol.section->vma;
1923 case C_EXTDEF: /* external definition */
1924 case C_ULABEL: /* undefined label */
1925 case C_USTATIC: /* undefined static */
1926 case C_LINE: /* line # reformatted as symbol table entry */
1927 case C_ALIAS: /* duplicate tag */
1928 case C_HIDDEN: /* ext symbol in dmert public lib */
1931 fprintf(stderr,"Unrecognized storage class %d\n",
1932 src->u.syment.n_sclass);
1934 dst->symbol.flags = BSF_DEBUGGING;
1935 dst->symbol.value = (src->u.syment.n_value);
1939 /* BFD_ASSERT(dst->symbol.flags != 0);*/
1943 dst->symbol.udata = 0;
1944 dst->lineno = (alent *) NULL;
1945 this_index += (src->u.syment.n_numaux) + 1;
1947 number_of_symbols++;
1948 } /* walk the native symtab */
1949 } /* bfdize the native symtab */
1951 obj_symbols(abfd) = cached_area;
1952 obj_raw_syments(abfd) = native_symbols;
1954 obj_conv_table_size (abfd) = bfd_get_symcount (abfd);
1955 bfd_get_symcount(abfd) = number_of_symbols;
1956 obj_convert(abfd) = table_ptr;
1957 /* Slurp the line tables for each section too */
1962 coff_slurp_line_table(abfd, p);
1967 } /* coff_slurp_symbol_table() */
1973 Coff relocations are easily transformed into the internal BFD form
1976 Reading a coff relocation table is done in the following stages:
1978 o The entire coff relocation table is read into memory.
1980 o Each relocation is processed in turn, first it is swapped from the
1981 external to the internal form.
1983 o The symbol referenced in the relocation's symbol index is
1984 turned intoa pointer into the canonical symbol table. Note
1985 that this table is the same as the one returned by a call to
1986 @code{bfd_canonicalize_symtab}. The back end will call the
1987 routine and save the result if a canonicalization hasn't been done.
1989 o The reloc index is turned into a pointer to a howto
1990 structure, in a back end specific way. For instance, the 386
1991 and 960 use the @code{r_type} to directly produce an index
1992 into a howto table vector; the 88k subtracts a number from the
1993 @code{r_type} field and creates an addend field.
1999 #define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
2000 if (ptr && bfd_asymbol_bfd(ptr) == abfd \
2001 && ((ptr->flags & BSF_OLD_COMMON)== 0)) \
2003 cache_ptr->addend = -(ptr->section->vma + ptr->value); \
2006 cache_ptr->addend = 0; \
2011 DEFUN(coff_slurp_reloc_table,(abfd, asect, symbols),
2016 RELOC *native_relocs;
2017 arelent *reloc_cache;
2022 if (asect->relocation)
2024 if (asect->reloc_count == 0)
2026 if (asect->flags & SEC_CONSTRUCTOR)
2028 if (!coff_slurp_symbol_table(abfd))
2031 (RELOC *) buy_and_read(abfd,
2035 asect->reloc_count));
2036 reloc_cache = (arelent *)
2037 bfd_alloc(abfd, (size_t) (asect->reloc_count * sizeof(arelent)));
2039 if (reloc_cache == NULL) {
2040 bfd_error = no_memory;
2045 for (idx = 0; idx < asect->reloc_count; idx ++)
2047 #ifdef RELOC_PROCESSING
2048 struct internal_reloc dst;
2049 struct external_reloc *src;
2051 cache_ptr = reloc_cache + idx;
2052 src = native_relocs + idx;
2053 bfd_swap_reloc_in(abfd, src, &dst);
2055 RELOC_PROCESSING(cache_ptr, &dst, symbols, abfd, asect);
2057 struct internal_reloc dst;
2059 struct external_reloc *src;
2061 cache_ptr = reloc_cache + idx;
2062 src = native_relocs + idx;
2064 bfd_swap_reloc_in(abfd, src, &dst);
2067 cache_ptr->address = dst.r_vaddr;
2069 if (dst.r_symndx != -1)
2071 /* @@ Should never be greater than count of symbols! */
2072 if (dst.r_symndx >= obj_conv_table_size (abfd))
2074 cache_ptr->sym_ptr_ptr = symbols + obj_convert(abfd)[dst.r_symndx];
2075 ptr = *(cache_ptr->sym_ptr_ptr);
2079 cache_ptr->sym_ptr_ptr= bfd_abs_section.symbol_ptr_ptr;
2084 The symbols definitions that we have read in have been
2085 relocated as if their sections started at 0. But the offsets
2086 refering to the symbols in the raw data have not been
2087 modified, so we have to have a negative addend to compensate.
2089 Note that symbols which used to be common must be left alone */
2091 /* Calculate any reloc addend by looking at the symbol */
2092 CALC_ADDEND(abfd, ptr, dst, cache_ptr);
2094 cache_ptr->address -= asect->vma;
2095 /* !! cache_ptr->section = (asection *) NULL;*/
2097 /* Fill in the cache_ptr->howto field from dst.r_type */
2098 RTYPE2HOWTO(cache_ptr, &dst);
2103 asect->relocation = reloc_cache;
2108 /* This is stupid. This function should be a boolean predicate */
2110 DEFUN(coff_canonicalize_reloc, (abfd, section, relptr, symbols),
2113 arelent **relptr AND
2116 arelent *tblptr = section->relocation;
2117 unsigned int count = 0;
2120 if (section->flags & SEC_CONSTRUCTOR)
2122 /* this section has relocs made up by us, they are not in the
2123 file, so take them out of their chain and place them into
2124 the data area provided */
2125 arelent_chain *chain = section->constructor_chain;
2126 for (count = 0; count < section->reloc_count; count ++)
2128 *relptr ++ = &chain->relent;
2129 chain = chain->next;
2135 coff_slurp_reloc_table(abfd, section, symbols);
2138 tblptr = section->relocation;
2142 for (; count++ < section->reloc_count;)
2143 *relptr++ = tblptr++;
2148 return section->reloc_count;
2153 coff_sym_filepos(abfd)
2156 return obj_sym_filepos(abfd);
2160 #ifndef coff_reloc16_extra_cases
2161 #define coff_reloc16_extra_cases \
2162 (void (*) PARAMS ((bfd *, bfd_seclet_type *, arelent *, bfd_byte *,\
2163 unsigned int *, unsigned int *))) abort
2166 static CONST bfd_coff_backend_data bfd_coff_std_swap_table = {
2167 coff_swap_aux_in, coff_swap_sym_in, coff_swap_lineno_in,
2168 coff_swap_aux_out, coff_swap_sym_out,
2169 coff_swap_lineno_out, coff_swap_reloc_out,
2170 coff_swap_filehdr_out, coff_swap_aouthdr_out,
2171 coff_swap_scnhdr_out,
2172 FILHSZ, AOUTSZ, SCNHSZ, SYMESZ, AUXESZ, LINESZ,
2173 #ifdef COFF_LONG_FILENAMES
2178 coff_swap_filehdr_in, coff_swap_aouthdr_in, coff_swap_scnhdr_in,
2179 coff_bad_format_hook, coff_set_arch_mach_hook, coff_mkobject_hook,
2180 styp_to_sec_flags, coff_make_section_hook, coff_set_alignment_hook,
2181 coff_slurp_symbol_table, symname_in_debug_hook, coff_reloc16_extra_cases
2184 #define coff_core_file_failing_command _bfd_dummy_core_file_failing_command
2185 #define coff_core_file_failing_signal _bfd_dummy_core_file_failing_signal
2186 #define coff_core_file_matches_executable_p _bfd_dummy_core_file_matches_executable_p
2187 #define coff_slurp_armap bfd_slurp_coff_armap
2188 #define coff_slurp_extended_name_table _bfd_slurp_extended_name_table
2189 #define coff_truncate_arname bfd_dont_truncate_arname
2190 #define coff_openr_next_archived_file bfd_generic_openr_next_archived_file
2191 #define coff_generic_stat_arch_elt bfd_generic_stat_arch_elt
2192 #define coff_get_section_contents bfd_generic_get_section_contents
2193 #define coff_close_and_cleanup bfd_generic_close_and_cleanup
2195 #define coff_bfd_debug_info_start bfd_void
2196 #define coff_bfd_debug_info_end bfd_void
2197 #define coff_bfd_debug_info_accumulate \
2198 (void (*) PARAMS ((bfd *, struct sec *))) bfd_void
2199 #define coff_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
2200 #define coff_bfd_relax_section bfd_generic_relax_section