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 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))
314 styp_flags = STYP_TEXT;
316 else if (!strcmp(sec_name, _DATA))
318 styp_flags = STYP_DATA;
321 else if (!strcmp(sec_name, ".data2"))
323 styp_flags = STYP_DATA;
324 #endif /* TWO_DATA_SECS */
326 else if (!strcmp(sec_name, _BSS))
328 styp_flags = STYP_BSS;
331 else if (!strcmp(sec_name, _COMMENT))
333 styp_flags = STYP_INFO;
334 #endif /* _COMMENT */
337 else if (!strcmp(sec_name, _LIB))
339 styp_flags = STYP_LIB;
343 else if (!strcmp (sec_name, _LIT))
345 stype_flags = STYP_LIT;
349 /* Try and figure out what it should be */
350 else if (sec_flags & SEC_CODE)
352 styp_flags = STYP_TEXT;
354 else if (sec_flags & SEC_DATA)
356 styp_flags = STYP_DATA;
358 else if (sec_flags & SEC_READONLY)
360 #ifdef STYP_LIT /* 29k readonly text/data section */
361 styp_flags = STYP_LIT;
363 styp_flags = STYP_TEXT;
364 #endif /* STYP_LIT */
366 else if (sec_flags & SEC_LOAD)
368 styp_flags = STYP_TEXT;
371 styp_flags = STYP_BSS;
375 if (sec_flags & SEC_NEVER_LOAD)
376 styp_flags |= STYP_NOLOAD;
382 * Return a word with SEC_* flags set to represent the incoming
383 * STYP_* flags (from scnhdr.s_flags). The inverse of this
384 * function is sec_to_styp_flags().
385 * NOTE: If you add to/change this routine, you should mirror the changes
386 * in sec_to_styp_flags().
389 DEFUN(styp_to_sec_flags, (abfd, hdr),
393 struct internal_scnhdr *internal_s = (struct internal_scnhdr *) hdr;
394 long styp_flags = internal_s->s_flags;
395 flagword sec_flags=0;
398 if (styp_flags & STYP_NOLOAD)
400 sec_flags |= SEC_NEVER_LOAD;
402 #endif /* STYP_NOLOAD */
404 /* For 386 COFF, at least, an unloadable text or data section is
405 actually a shared library section. */
406 if (styp_flags & STYP_TEXT)
408 if (sec_flags & SEC_NEVER_LOAD)
409 sec_flags |= SEC_CODE | SEC_SHARED_LIBRARY;
411 sec_flags |= SEC_CODE | SEC_LOAD | SEC_ALLOC;
413 else if (styp_flags & STYP_DATA)
415 if (sec_flags & SEC_NEVER_LOAD)
416 sec_flags |= SEC_DATA | SEC_SHARED_LIBRARY;
418 sec_flags |= SEC_DATA | SEC_LOAD | SEC_ALLOC;
420 else if (styp_flags & STYP_BSS)
422 #ifdef BSS_NOLOAD_IS_SHARED_LIBRARY
423 if (sec_flags & SEC_NEVER_LOAD)
424 sec_flags |= SEC_ALLOC | SEC_SHARED_LIBRARY;
427 sec_flags |= SEC_ALLOC;
429 else if (styp_flags & STYP_INFO)
435 sec_flags |= SEC_ALLOC | SEC_LOAD;
438 #ifdef STYP_LIT /* A29k readonly text/data section type */
439 if ((styp_flags & STYP_LIT) == STYP_LIT)
441 sec_flags = (SEC_LOAD | SEC_ALLOC | SEC_READONLY);
443 #endif /* STYP_LIT */
444 #ifdef STYP_OTHER_LOAD /* Other loaded sections */
445 if (styp_flags & STYP_OTHER_LOAD)
447 sec_flags = (SEC_LOAD | SEC_ALLOC);
449 #endif /* STYP_SDATA */
454 #define get_index(symbol) ((int) (symbol)->udata)
458 bfd_coff_backend_data
462 Special entry points for gdb to swap in coff symbol table parts
465 . void (*_bfd_coff_swap_aux_in) PARAMS ((
472 . void (*_bfd_coff_swap_sym_in) PARAMS ((
477 . void (*_bfd_coff_swap_lineno_in) PARAMS ((
483 Special entry points for gas to swap coff parts
485 . unsigned int (*_bfd_coff_swap_aux_out) PARAMS ((
492 . unsigned int (*_bfd_coff_swap_sym_out) PARAMS ((
497 . unsigned int (*_bfd_coff_swap_lineno_out) PARAMS ((
502 . unsigned int (*_bfd_coff_swap_reloc_out) PARAMS ((
507 . unsigned int (*_bfd_coff_swap_filehdr_out) PARAMS ((
512 . unsigned int (*_bfd_coff_swap_aouthdr_out) PARAMS ((
517 . unsigned int (*_bfd_coff_swap_scnhdr_out) PARAMS ((
523 Special entry points for generic COFF routines to call target
524 dependent COFF routines
526 . unsigned int _bfd_filhsz;
527 . unsigned int _bfd_aoutsz;
528 . unsigned int _bfd_scnhsz;
529 . unsigned int _bfd_symesz;
530 . unsigned int _bfd_auxesz;
531 . unsigned int _bfd_linesz;
532 . boolean _bfd_coff_long_filenames;
533 . void (*_bfd_coff_swap_filehdr_in) PARAMS ((
537 . void (*_bfd_coff_swap_aouthdr_in) PARAMS ((
541 . void (*_bfd_coff_swap_scnhdr_in) PARAMS ((
545 . boolean (*_bfd_coff_bad_format_hook) PARAMS ((
547 . PTR internal_filehdr));
548 . boolean (*_bfd_coff_set_arch_mach_hook) PARAMS ((
550 . PTR internal_filehdr));
551 . PTR (*_bfd_coff_mkobject_hook) PARAMS ((
553 . PTR internal_filehdr,
554 . PTR internal_aouthdr));
555 . flagword (*_bfd_styp_to_sec_flags_hook) PARAMS ((
557 . PTR internal_scnhdr));
558 . asection *(*_bfd_make_section_hook) PARAMS ((
561 . void (*_bfd_set_alignment_hook) PARAMS ((
564 . PTR internal_scnhdr));
565 . boolean (*_bfd_coff_slurp_symbol_table) PARAMS ((
567 . boolean (*_bfd_coff_symname_in_debug) PARAMS ((
569 . struct internal_syment *sym));
570 . void (*_bfd_coff_reloc16_extra_cases) PARAMS ((
572 . struct bfd_seclet *seclet,
575 . unsigned int *src_ptr,
576 . unsigned int *dst_ptr));
577 .} bfd_coff_backend_data;
579 .#define coff_backend_info(abfd) ((bfd_coff_backend_data *) (abfd)->xvec->backend_data)
581 .#define bfd_coff_swap_aux_in(a,e,t,c,i) \
582 . ((coff_backend_info (a)->_bfd_coff_swap_aux_in) (a,e,t,c,i))
584 .#define bfd_coff_swap_sym_in(a,e,i) \
585 . ((coff_backend_info (a)->_bfd_coff_swap_sym_in) (a,e,i))
587 .#define bfd_coff_swap_lineno_in(a,e,i) \
588 . ((coff_backend_info ( a)->_bfd_coff_swap_lineno_in) (a,e,i))
590 .#define bfd_coff_swap_reloc_out(abfd, i, o) \
591 . ((coff_backend_info (abfd)->_bfd_coff_swap_reloc_out) (abfd, i, o))
593 .#define bfd_coff_swap_lineno_out(abfd, i, o) \
594 . ((coff_backend_info (abfd)->_bfd_coff_swap_lineno_out) (abfd, i, o))
596 .#define bfd_coff_swap_aux_out(abfd, i, t,c,o) \
597 . ((coff_backend_info (abfd)->_bfd_coff_swap_aux_out) (abfd, i,t,c, o))
599 .#define bfd_coff_swap_sym_out(abfd, i,o) \
600 . ((coff_backend_info (abfd)->_bfd_coff_swap_sym_out) (abfd, i, o))
602 .#define bfd_coff_swap_scnhdr_out(abfd, i,o) \
603 . ((coff_backend_info (abfd)->_bfd_coff_swap_scnhdr_out) (abfd, i, o))
605 .#define bfd_coff_swap_filehdr_out(abfd, i,o) \
606 . ((coff_backend_info (abfd)->_bfd_coff_swap_filehdr_out) (abfd, i, o))
608 .#define bfd_coff_swap_aouthdr_out(abfd, i,o) \
609 . ((coff_backend_info (abfd)->_bfd_coff_swap_aouthdr_out) (abfd, i, o))
611 .#define bfd_coff_filhsz(abfd) (coff_backend_info (abfd)->_bfd_filhsz)
612 .#define bfd_coff_aoutsz(abfd) (coff_backend_info (abfd)->_bfd_aoutsz)
613 .#define bfd_coff_scnhsz(abfd) (coff_backend_info (abfd)->_bfd_scnhsz)
614 .#define bfd_coff_symesz(abfd) (coff_backend_info (abfd)->_bfd_symesz)
615 .#define bfd_coff_auxesz(abfd) (coff_backend_info (abfd)->_bfd_auxesz)
616 .#define bfd_coff_linesz(abfd) (coff_backend_info (abfd)->_bfd_linesz)
617 .#define bfd_coff_long_filenames(abfd) (coff_backend_info (abfd)->_bfd_coff_long_filenames)
618 .#define bfd_coff_swap_filehdr_in(abfd, i,o) \
619 . ((coff_backend_info (abfd)->_bfd_coff_swap_filehdr_in) (abfd, i, o))
621 .#define bfd_coff_swap_aouthdr_in(abfd, i,o) \
622 . ((coff_backend_info (abfd)->_bfd_coff_swap_aouthdr_in) (abfd, i, o))
624 .#define bfd_coff_swap_scnhdr_in(abfd, i,o) \
625 . ((coff_backend_info (abfd)->_bfd_coff_swap_scnhdr_in) (abfd, i, o))
627 .#define bfd_coff_bad_format_hook(abfd, filehdr) \
628 . ((coff_backend_info (abfd)->_bfd_coff_bad_format_hook) (abfd, filehdr))
630 .#define bfd_coff_set_arch_mach_hook(abfd, filehdr)\
631 . ((coff_backend_info (abfd)->_bfd_coff_set_arch_mach_hook) (abfd, filehdr))
632 .#define bfd_coff_mkobject_hook(abfd, filehdr, aouthdr)\
633 . ((coff_backend_info (abfd)->_bfd_coff_mkobject_hook) (abfd, filehdr, aouthdr))
635 .#define bfd_coff_styp_to_sec_flags_hook(abfd, scnhdr)\
636 . ((coff_backend_info (abfd)->_bfd_styp_to_sec_flags_hook) (abfd, scnhdr))
638 .#define bfd_coff_make_section_hook(abfd, name)\
639 . ((coff_backend_info (abfd)->_bfd_make_section_hook) (abfd, name))
641 .#define bfd_coff_set_alignment_hook(abfd, sec, scnhdr)\
642 . ((coff_backend_info (abfd)->_bfd_set_alignment_hook) (abfd, sec, scnhdr))
644 .#define bfd_coff_slurp_symbol_table(abfd)\
645 . ((coff_backend_info (abfd)->_bfd_coff_slurp_symbol_table) (abfd))
647 .#define bfd_coff_symname_in_debug(abfd, sym)\
648 . ((coff_backend_info (abfd)->_bfd_coff_symname_in_debug) (abfd, sym))
650 .#define bfd_coff_reloc16_extra_cases(abfd, seclet, reloc, data, src_ptr, dst_ptr)\
651 . ((coff_backend_info (abfd)->_bfd_coff_reloc16_extra_cases)\
652 . (abfd, seclet, reloc, data, src_ptr, dst_ptr))
656 /* See whether the magic number matches. */
659 DEFUN(coff_bad_format_hook, (abfd, filehdr),
663 struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr;
665 if (BADMAG (*internal_f))
668 /* if the optional header is NULL or not the correct size then
669 quit; the only difference I can see between m88k dgux headers (MC88DMAGIC)
670 and Intel 960 readwrite headers (I960WRMAGIC) is that the
671 optional header is of a different size.
673 But the mips keeps extra stuff in it's opthdr, so dont check
677 #if defined(M88) || defined(I960)
678 if (internal_f->f_opthdr != 0 && AOUTSZ != internal_f->f_opthdr)
686 DEFUN (coff_make_section_hook, (abfd, name),
691 /* On SCO a file created by the Microsoft assembler can have two
692 .data sections. We use .data2 for the second one. */
693 if (strcmp (name, _DATA) == 0)
694 return bfd_make_section (abfd, ".data2");
696 return (asection *) NULL;
700 initialize a section structure with information peculiar to this
701 particular implementation of coff
705 DEFUN(coff_new_section_hook,(abfd, section),
709 section->alignment_power = abfd->xvec->align_power_min;
710 /* Allocate aux records for section symbols, to store size and
713 @@ Shouldn't use constant multiplier here! */
714 coffsymbol (section->symbol)->native =
715 (combined_entry_type *) bfd_zalloc (abfd,
716 sizeof (combined_entry_type) * 10);
723 /* Set the alignment of a BFD section. */
726 DEFUN (coff_set_alignment_hook, (abfd, section, scnhdr),
728 asection *section AND
731 struct internal_scnhdr *hdr = (struct internal_scnhdr *) scnhdr;
734 for (i = 0; i < 32; i++)
735 if ((1 << i) >= hdr->s_align)
737 section->alignment_power = i;
742 #define coff_set_alignment_hook \
743 ((void (*) PARAMS ((bfd *, asection *, PTR))) bfd_void)
748 DEFUN(coff_mkobject,(abfd),
751 coff_data_type *coff;
753 abfd->tdata.coff_obj_data = (struct coff_tdata *)bfd_zalloc (abfd,sizeof(coff_data_type));
754 if (abfd->tdata.coff_obj_data == 0){
755 bfd_error = no_memory;
758 coff = coff_data (abfd);
759 coff->symbols = (coff_symbol_type *) NULL;
760 coff->conversion_table = (unsigned int *) NULL;
761 coff->raw_syments = (struct coff_ptr_struct *) NULL;
762 coff->raw_linenos = (struct lineno *) NULL;
764 /* make_abs_section(abfd);*/
768 /* Create the COFF backend specific information. */
771 DEFUN(coff_mkobject_hook,(abfd, filehdr, aouthdr),
776 struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr;
777 coff_data_type *coff;
779 if (coff_mkobject (abfd) == false)
782 coff = coff_data (abfd);
784 coff->sym_filepos = internal_f->f_symptr;
785 coff->flags = internal_f->f_flags;
787 /* These members communicate important constants about the symbol
788 table to GDB's symbol-reading code. These `constants'
789 unfortunately vary among coff implementations... */
790 coff->local_n_btmask = N_BTMASK;
791 coff->local_n_btshft = N_BTSHFT;
792 coff->local_n_tmask = N_TMASK;
793 coff->local_n_tshift = N_TSHIFT;
794 coff->local_symesz = SYMESZ;
795 coff->local_auxesz = AUXESZ;
796 coff->local_linesz = LINESZ;
801 /* Determine the machine architecture and type. FIXME: This is target
802 dependent because the magic numbers are defined in the target
803 dependent header files. But there is no particular need for this.
804 If the magic numbers were moved to a separate file, this function
805 would be target independent and would also be much more successful
806 at linking together COFF files for different architectures. */
809 DEFUN (coff_set_arch_mach_hook, (abfd, filehdr),
814 enum bfd_architecture arch;
815 struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr;
818 switch (internal_f->f_magic) {
822 case I386AIXMAGIC: /* Danbury PS/2 AIX C Compiler */
824 arch = bfd_arch_i386;
829 #ifdef A29K_MAGIC_BIG
831 case A29K_MAGIC_LITTLE:
832 arch = bfd_arch_a29k;
840 arch = bfd_arch_m68k;
848 arch = bfd_arch_m88k;
855 switch (internal_f->f_flags & F_MACHMASK)
858 machine = bfd_mach_z8001;
861 machine = bfd_mach_z8002;
872 arch = bfd_arch_i960;
873 switch (F_I960TYPE & internal_f->f_flags)
877 machine = bfd_mach_i960_core;
880 machine = bfd_mach_i960_kb_sb;
883 machine = bfd_mach_i960_mc;
886 machine = bfd_mach_i960_xa;
889 machine = bfd_mach_i960_ca;
892 machine = bfd_mach_i960_ka_sa;
903 arch = bfd_arch_rs6000;
910 arch = bfd_arch_we32k;
917 arch = bfd_arch_h8300;
919 /* !! FIXME this probably isn't the right place for this */
920 abfd->flags |= BFD_IS_RELAXABLE;
926 arch = bfd_arch_h8500;
931 default: /* Unreadable input file type */
932 arch = bfd_arch_obscure;
936 bfd_default_set_arch_mach(abfd, arch, machine);
940 #ifdef SYMNAME_IN_DEBUG
943 DEFUN (symname_in_debug_hook, (abfd, sym),
945 struct internal_syment *sym)
947 return SYMNAME_IN_DEBUG (sym) ? true : false;
952 #define symname_in_debug_hook \
953 (boolean (*) PARAMS ((bfd *, struct internal_syment *))) bfd_false
961 To write relocations, all the back end does is step though the
962 canonical relocation table, and create an
963 @code{internal_reloc}. The symbol index to use is removed from
964 the @code{offset} field in the symbol table supplied, the
965 address comes directly from the sum of the section base
966 address and the relocation offset and the type is dug directly
967 from the howto field. Then the @code{internal_reloc} is
968 swapped into the shape of an @code{external_reloc} and written
974 DEFUN(coff_write_relocs,(abfd),
978 for (s = abfd->sections; s != (asection *) NULL; s = s->next) {
980 struct external_reloc dst;
982 arelent **p = s->orelocation;
983 bfd_seek(abfd, s->rel_filepos, SEEK_SET);
984 for (i = 0; i < s->reloc_count; i++) {
985 struct internal_reloc n;
987 memset((PTR)&n, 0, sizeof(n));
989 n.r_vaddr = q->address + s->vma;
990 /* The 29k const/consth reloc pair is a real kludge - the consth
991 part doesn't have a symbol - it has an offset. So rebuilt
994 if (q->howto->type == R_IHCONST)
995 n.r_symndx = q->addend;
1002 if (q->sym_ptr_ptr == bfd_abs_section.symbol_ptr_ptr)
1004 /* This is a relocation relative to the absolute symbol */
1009 n.r_symndx = get_index((*(q->sym_ptr_ptr)));
1010 /* Take notice if the symbol reloc points to a symbol we don't have
1011 in our symbol table. What should we do for this?? */
1012 if (n.r_symndx > obj_conv_table_size (abfd))
1020 /* Work out reloc type from what is required */
1021 SELECT_RELOC(n.r_type, q->howto);
1023 n.r_type = q->howto->type;
1025 coff_swap_reloc_out(abfd, &n, &dst);
1026 bfd_write((PTR) &dst, 1, RELSZ, abfd);
1031 /* Set flags and magic number of a coff file from architecture and machine
1032 type. Result is true if we can represent the arch&type, false if not. */
1035 DEFUN(coff_set_flags,(abfd, magicp, flagsp),
1037 unsigned *magicp AND
1038 unsigned short *flagsp)
1040 switch (bfd_get_arch(abfd)) {
1044 switch (bfd_get_mach(abfd))
1046 case bfd_mach_z8001:
1049 case bfd_mach_z8002:
1063 *magicp = I960ROMAGIC;
1065 ((bfd_get_file_flags(abfd) & WP_TEXT) ? I960ROMAGIC :
1066 I960RWMAGIC); FIXME???
1068 switch (bfd_get_mach(abfd)) {
1069 case bfd_mach_i960_core:
1072 case bfd_mach_i960_kb_sb:
1075 case bfd_mach_i960_mc:
1078 case bfd_mach_i960_xa:
1081 case bfd_mach_i960_ca:
1084 case bfd_mach_i960_ka_sa:
1097 *magicp = I386MAGIC;
1103 *magicp = MC68MAGIC;
1110 *magicp = MC88OMAGIC;
1115 case bfd_arch_h8300:
1116 *magicp = H8300MAGIC;
1121 case bfd_arch_h8500:
1122 *magicp = H8500MAGIC;
1126 #ifdef A29K_MAGIC_BIG
1128 if (abfd->xvec->byteorder_big_p)
1129 *magicp = A29K_MAGIC_BIG;
1131 *magicp = A29K_MAGIC_LITTLE;
1137 case bfd_arch_we32k:
1138 *magicp = WE32KMAGIC;
1144 case bfd_arch_rs6000:
1145 *magicp = U802TOCMAGIC;
1150 default: /* Unknown architecture */
1151 /* return false; -- fall through to "return false" below, to avoid
1152 "statement never reached" errors on the one below. */
1161 DEFUN(coff_set_arch_mach,(abfd, arch, machine),
1163 enum bfd_architecture arch AND
1164 unsigned long machine)
1167 unsigned short dummy2;
1168 bfd_default_set_arch_mach(abfd, arch, machine);
1170 if (arch != bfd_arch_unknown &&
1171 coff_set_flags(abfd, &dummy1, &dummy2) != true)
1172 return false; /* We can't represent this type */
1173 return true; /* We're easy ... */
1177 /* Calculate the file position for each section. */
1180 DEFUN(coff_compute_section_file_positions,(abfd),
1184 asection *previous = (asection *)NULL;
1185 file_ptr sofar = FILHSZ;
1189 if (bfd_get_start_address(abfd))
1191 /* A start address may have been added to the original file. In this
1192 case it will need an optional header to record it. */
1193 abfd->flags |= EXEC_P;
1196 if (abfd->flags & EXEC_P)
1199 sofar += abfd->section_count * SCNHSZ;
1200 for (current = abfd->sections;
1201 current != (asection *)NULL;
1202 current = current->next) {
1204 /* Only deal with sections which have contents */
1205 if (!(current->flags & SEC_HAS_CONTENTS))
1208 /* Align the sections in the file to the same boundary on
1209 which they are aligned in virtual memory. I960 doesn't
1210 do this (FIXME) so we can stay in sync with Intel. 960
1211 doesn't yet page from files... */
1214 /* make sure this section is aligned on the right boundary - by
1215 padding the previous section up if necessary */
1218 sofar = BFD_ALIGN(sofar, 1 << current->alignment_power);
1219 if (previous != (asection *)NULL) {
1220 previous->_raw_size += sofar - old_sofar;
1225 /* FIXME, in demand paged files, the low order bits of the file
1226 offset must match the low order bits of the virtual address.
1227 "Low order" is apparently implementation defined. Add code
1228 here to round sofar up to match the virtual address. */
1230 current->filepos = sofar;
1232 sofar += current->_raw_size;
1234 /* make sure that this section is of the right size too */
1236 sofar = BFD_ALIGN(sofar, 1 << current->alignment_power);
1237 current->_raw_size += sofar - old_sofar ;
1241 /* Force .lib sections to start at zero. The vma is then
1242 incremented in coff_set_section_contents. This is right for
1244 if (strcmp (current->name, _LIB) == 0)
1245 bfd_set_section_vma (abfd, current, 0);
1250 obj_relocbase(abfd) = sofar;
1253 /* If .file, .text, .data, .bss symbols are missing, add them. */
1254 /* @@ Should we only be adding missing symbols, or overriding the aux
1255 values for existing section symbols? */
1257 coff_add_missing_symbols (abfd)
1260 unsigned int nsyms = bfd_get_symcount (abfd);
1261 asymbol **sympp = abfd->outsymbols;
1264 int need_text = 1, need_data = 1, need_bss = 1, need_file = 1;
1266 for (i = 0; i < nsyms; i++)
1268 coff_symbol_type *csym = coff_symbol_from (abfd, sympp[i]);
1272 /* only do this if there is a coff representation of the input
1274 if (csym->native && csym->native->u.syment.n_sclass == C_FILE)
1279 name = csym->symbol.name;
1282 if (!strcmp (name, _TEXT))
1284 else if (!strcmp (name, _DATA))
1286 else if (!strcmp (name, _BSS))
1290 /* Now i == bfd_get_symcount (abfd). */
1291 /* @@ For now, don't deal with .file symbol. */
1294 if (!need_text && !need_data && !need_bss && !need_file)
1296 nsyms += need_text + need_data + need_bss + need_file;
1297 sympp2 = (asymbol**) bfd_alloc_by_size_t (abfd, nsyms * sizeof (asymbol *));
1298 memcpy (sympp2, sympp, i * sizeof (asymbol *));
1301 /* @@ Generate fake .file symbol, in sympp2[i], and increment i. */
1305 sympp2[i++] = coff_section_symbol (abfd, _TEXT);
1307 sympp2[i++] = coff_section_symbol (abfd, _DATA);
1309 sympp2[i++] = coff_section_symbol (abfd, _BSS);
1310 BFD_ASSERT (i == nsyms);
1311 bfd_set_symtab (abfd, sympp2, nsyms);
1317 DEFUN(coff_write_object_contents,(abfd),
1323 boolean hasrelocs = false;
1324 boolean haslinno = false;
1325 file_ptr reloc_base;
1326 file_ptr lineno_base;
1330 unsigned long reloc_size = 0;
1331 unsigned long lnno_size = 0;
1332 asection *text_sec = NULL;
1333 asection *data_sec = NULL;
1334 asection *bss_sec = NULL;
1336 struct internal_filehdr internal_f;
1337 struct internal_aouthdr internal_a;
1340 bfd_error = system_call_error;
1341 /* Number the output sections, starting from one on the first section
1342 with a name which doesn't start with a *.
1343 @@ The code doesn't make this check. Is it supposed to be done,
1346 for (current = abfd->sections; current != (asection *)NULL;
1347 current = current->next)
1349 current->target_index = count;
1353 if(abfd->output_has_begun == false) {
1354 coff_compute_section_file_positions(abfd);
1357 if (abfd->sections != (asection *)NULL) {
1358 scn_base = abfd->sections->filepos;
1363 if (bfd_seek(abfd, scn_base, SEEK_SET) != 0)
1365 reloc_base = obj_relocbase(abfd);
1367 /* Make a pass through the symbol table to count line number entries and
1368 put them into the correct asections */
1370 lnno_size = coff_count_linenumbers(abfd) * LINESZ;
1371 data_base = scn_base;
1373 /* Work out the size of the reloc and linno areas */
1375 for (current = abfd->sections; current != NULL; current =
1378 /* We give section headers to +ve indexes */
1379 if (current->target_index > 0)
1382 reloc_size += current->reloc_count * RELSZ;
1383 data_base += SCNHSZ;
1388 lineno_base = reloc_base + reloc_size;
1389 sym_base = lineno_base + lnno_size;
1391 /* Indicate in each section->line_filepos its actual file address */
1392 for (current = abfd->sections; current != NULL; current =
1395 if (current->target_index > 0)
1398 if (current->lineno_count) {
1399 current->line_filepos = lineno_base;
1400 current->moving_line_filepos = lineno_base;
1401 lineno_base += current->lineno_count * LINESZ;
1404 current->line_filepos = 0;
1406 if (current->reloc_count) {
1407 current->rel_filepos = reloc_base;
1408 reloc_base += current->reloc_count * RELSZ;
1411 current->rel_filepos = 0;
1418 /* Write section headers to the file. */
1419 internal_f.f_nscns = 0;
1421 (file_ptr) ((abfd->flags & EXEC_P) ?
1422 (FILHSZ + AOUTSZ) : FILHSZ),
1427 unsigned int pad = abfd->flags & D_PAGED ? data_base : 0;
1429 unsigned int pad = 0;
1431 for (current = abfd->sections;
1433 current = current->next) {
1434 struct internal_scnhdr section;
1435 if (current->target_index > 0)
1437 internal_f.f_nscns ++;
1438 strncpy(&(section.s_name[0]), current->name, 8);
1440 /* Always set s_vaddr of .lib to 0. This is right for SVR3.2
1442 if (strcmp (current->name, _LIB) == 0)
1443 section.s_vaddr = 0;
1446 section.s_vaddr = current->lma + pad;
1447 section.s_paddr = current->lma + pad;
1448 section.s_size = current->_raw_size - pad;
1450 If this section has no size or is unloadable then the scnptr
1453 if (current->_raw_size - pad == 0 ||
1454 (current->flags & (SEC_LOAD | SEC_HAS_CONTENTS)) == 0) {
1455 section.s_scnptr = 0;
1458 section.s_scnptr = current->filepos;
1460 section.s_relptr = current->rel_filepos;
1461 section.s_lnnoptr = current->line_filepos;
1462 section.s_nreloc = current->reloc_count;
1463 section.s_nlnno = current->lineno_count;
1464 if (current->reloc_count != 0)
1466 if (current->lineno_count != 0)
1469 section.s_flags = sec_to_styp_flags(current->name,current->flags);
1471 if (!strcmp(current->name, _TEXT)) {
1473 } else if (!strcmp(current->name, _DATA)) {
1475 #ifdef TWO_DATA_SECS
1476 } else if (!strcmp(current->name, ".data2")) {
1478 #endif /* TWO_DATA_SECS */
1479 } else if (!strcmp(current->name, _BSS)) {
1484 section.s_align = (current->alignment_power
1485 ? 1 << current->alignment_power
1492 coff_swap_scnhdr_out(abfd, §ion, &buff);
1493 bfd_write((PTR) (&buff), 1, SCNHSZ, abfd);
1503 /* OK, now set up the filehdr... */
1505 /* Don't include the internal abs section in the section count */
1508 We will NOT put a fucking timestamp in the header here. Every time you
1509 put it back, I will come in and take it out again. I'm sorry. This
1510 field does not belong here. We fill it with a 0 so it compares the
1513 internal_f.f_timdat = 0;
1515 if (bfd_get_symcount(abfd) != 0)
1516 internal_f.f_symptr = sym_base;
1518 internal_f.f_symptr = 0;
1520 internal_f.f_flags = 0;
1522 if (abfd->flags & EXEC_P)
1523 internal_f.f_opthdr = AOUTSZ;
1525 internal_f.f_opthdr = 0;
1528 internal_f.f_flags |= F_RELFLG;
1530 internal_f.f_flags |= F_LNNO;
1531 if (0 == bfd_get_symcount(abfd))
1532 internal_f.f_flags |= F_LSYMS;
1533 if (abfd->flags & EXEC_P)
1534 internal_f.f_flags |= F_EXEC;
1536 if (!abfd->xvec->byteorder_big_p)
1537 internal_f.f_flags |= F_AR32WR;
1539 internal_f.f_flags |= F_AR32W;
1542 FIXME, should do something about the other byte orders and
1546 /* Set up architecture-dependent stuff */
1548 { unsigned int magic = 0;
1549 unsigned short flags = 0;
1550 coff_set_flags(abfd, &magic, &flags);
1551 internal_f.f_magic = magic;
1552 internal_f.f_flags |= flags;
1553 /* ...and the "opt"hdr... */
1556 # ifdef ULTRA3 /* NYU's machine */
1557 /* FIXME: This is a bogus check. I really want to see if there
1558 * is a .shbss or a .shdata section, if so then set the magic
1559 * number to indicate a shared data executable.
1561 if (internal_f.f_nscns >= 7)
1562 internal_a.magic = SHMAGIC; /* Shared magic */
1564 # endif /* ULTRA3 */
1565 internal_a.magic = NMAGIC; /* Assume separate i/d */
1566 #define __A_MAGIC_SET__
1569 internal_a.magic = (magic == I960ROMAGIC ? NMAGIC : OMAGIC);
1570 #define __A_MAGIC_SET__
1573 #define __A_MAGIC_SET__
1574 internal_a.magic = PAGEMAGICBCS;
1578 #define __A_MAGIC_SET__
1579 /* Never was anything here for the 68k */
1580 #endif /* M68 || WE32K */
1583 # define __A_MAGIC_SET__
1584 internal_a.magic = ZMAGIC;
1588 #define __A_MAGIC_SET__
1589 internal_a.magic = (abfd->flags & D_PAGED)? RS6K_AOUTHDR_ZMAGIC:
1590 (abfd->flags & WP_TEXT)? RS6K_AOUTHDR_NMAGIC:
1591 RS6K_AOUTHDR_OMAGIC;
1594 #ifndef __A_MAGIC_SET__
1595 # include "Your aouthdr magic number is not being set!"
1597 # undef __A_MAGIC_SET__
1600 /* Now should write relocs, strings, syms */
1601 obj_sym_filepos(abfd) = sym_base;
1603 if (bfd_get_symcount(abfd) != 0) {
1604 coff_add_missing_symbols (abfd);
1605 coff_renumber_symbols(abfd);
1606 coff_mangle_symbols(abfd);
1607 coff_write_symbols(abfd);
1608 coff_write_linenumbers(abfd);
1609 coff_write_relocs(abfd);
1612 internal_a.tsize = bfd_get_section_size_before_reloc(text_sec);
1613 internal_a.text_start = internal_a.tsize ? text_sec->vma : 0;
1616 internal_a.dsize = bfd_get_section_size_before_reloc(data_sec);
1617 internal_a.data_start = internal_a.dsize ? data_sec->vma : 0;
1620 internal_a.bsize = bfd_get_section_size_before_reloc(bss_sec);
1623 internal_a.entry = bfd_get_start_address(abfd);
1624 internal_f.f_nsyms = bfd_get_symcount(abfd);
1626 /* now write them */
1627 if (bfd_seek(abfd, (file_ptr) 0, SEEK_SET) != 0)
1631 coff_swap_filehdr_out(abfd, (PTR)&internal_f, (PTR)&buff);
1632 bfd_write((PTR) &buff, 1, FILHSZ, abfd);
1634 if (abfd->flags & EXEC_P) {
1636 coff_swap_aouthdr_out(abfd, (PTR)&internal_a, (PTR)&buff);
1637 bfd_write((PTR) &buff, 1, AOUTSZ, abfd);
1643 DEFUN(coff_set_section_contents,(abfd, section, location, offset, count),
1648 bfd_size_type count)
1650 if (abfd->output_has_begun == false) /* set by bfd.c handler */
1651 coff_compute_section_file_positions(abfd);
1654 /* If this is a .lib section, bump the vma address so that it
1655 winds up being the number of .lib sections output. This is
1656 right for SVR3.2. Shared libraries should probably get more
1658 if (strcmp (section->name, _LIB) == 0)
1662 /* Don't write out bss sections - one way to do this is to
1663 see if the filepos has not been set. */
1664 if (section->filepos == 0)
1667 bfd_seek(abfd, (file_ptr) (section->filepos + offset), SEEK_SET);
1670 return (bfd_write(location, 1, count, abfd) == count) ? true : false;
1676 coff_close_and_cleanup(abfd)
1679 if (!bfd_read_p(abfd))
1680 switch (abfd->format) {
1682 if (!_bfd_write_archive_contents(abfd))
1686 if (!coff_write_object_contents(abfd))
1690 bfd_error = invalid_operation;
1694 /* We depend on bfd_close to free all the memory on the obstack. */
1695 /* FIXME if bfd_release is not using obstacks! */
1702 buy_and_read(abfd, where, seek_direction, size)
1708 PTR area = (PTR) bfd_alloc(abfd, size);
1710 bfd_error = no_memory;
1713 bfd_seek(abfd, where, seek_direction);
1714 if (bfd_read(area, 1, size, abfd) != size) {
1715 bfd_error = system_call_error;
1719 } /* buy_and_read() */
1725 Creating the linenumber table is done by reading in the entire
1726 coff linenumber table, and creating another table for internal use.
1728 A coff line number table is structured so that each function
1729 is marked as having a line number of 0. Each line within the
1730 function is an offset from the first line in the function. The
1731 base of the line number information for the table is stored in
1732 the symbol associated with the function.
1734 The information is copied from the external to the internal
1735 table, and each symbol which marks a function is marked by
1738 How does this work ?
1743 coff_slurp_line_table(abfd, asect)
1747 LINENO *native_lineno;
1748 alent *lineno_cache;
1750 BFD_ASSERT(asect->lineno == (alent *) NULL);
1752 native_lineno = (LINENO *) buy_and_read(abfd,
1753 asect->line_filepos,
1756 asect->lineno_count));
1758 (alent *) bfd_alloc(abfd, (size_t) ((asect->lineno_count + 1) * sizeof(alent)));
1759 if (lineno_cache == NULL) {
1760 bfd_error = no_memory;
1763 unsigned int counter = 0;
1764 alent *cache_ptr = lineno_cache;
1765 LINENO *src = native_lineno;
1767 while (counter < asect->lineno_count) {
1768 struct internal_lineno dst;
1769 coff_swap_lineno_in(abfd, src, &dst);
1770 cache_ptr->line_number = dst.l_lnno;
1772 if (cache_ptr->line_number == 0) {
1773 coff_symbol_type *sym =
1774 (coff_symbol_type *) (dst.l_addr.l_symndx
1775 + obj_raw_syments(abfd))->u.syment._n._n_n._n_zeroes;
1776 cache_ptr->u.sym = (asymbol *) sym;
1777 sym->lineno = cache_ptr;
1780 cache_ptr->u.offset = dst.l_addr.l_paddr
1781 - bfd_section_vma(abfd, asect);
1782 } /* If no linenumber expect a symbol index */
1788 cache_ptr->line_number = 0;
1791 asect->lineno = lineno_cache;
1792 /* FIXME, free native_lineno here, or use alloca or something. */
1794 } /* coff_slurp_line_table() */
1797 DEFUN(coff_slurp_symbol_table,(abfd),
1800 combined_entry_type *native_symbols;
1801 coff_symbol_type *cached_area;
1802 unsigned int *table_ptr;
1804 unsigned int number_of_symbols = 0;
1805 if (obj_symbols(abfd))
1807 bfd_seek(abfd, obj_sym_filepos(abfd), SEEK_SET);
1809 /* Read in the symbol table */
1810 if ((native_symbols = coff_get_normalized_symtab(abfd)) == NULL) {
1814 /* Allocate enough room for all the symbols in cached form */
1816 (coff_symbol_type *)
1817 bfd_alloc(abfd, (size_t) (bfd_get_symcount(abfd) * sizeof(coff_symbol_type)));
1819 if (cached_area == NULL) {
1820 bfd_error = no_memory;
1825 bfd_alloc(abfd, (size_t) (bfd_get_symcount(abfd) * sizeof(unsigned int)));
1827 if (table_ptr == NULL) {
1828 bfd_error = no_memory;
1833 coff_symbol_type *dst = cached_area;
1834 unsigned int last_native_index = bfd_get_symcount(abfd);
1835 unsigned int this_index = 0;
1836 while (this_index < last_native_index) {
1837 combined_entry_type *src = native_symbols + this_index;
1838 table_ptr[this_index] = number_of_symbols;
1839 dst->symbol.the_bfd = abfd;
1841 dst->symbol.name = (char *)(src->u.syment._n._n_n._n_offset);
1843 We use the native name field to point to the cached field
1845 src->u.syment._n._n_n._n_zeroes = (int) dst;
1846 dst->symbol.section = coff_section_from_bfd_index(abfd,
1847 src->u.syment.n_scnum);
1848 dst->symbol.flags = 0;
1849 dst->done_lineno = false;
1851 switch (src->u.syment.n_sclass) {
1855 dst->symbol.value = src->u.syment.n_value - dst->symbol.section->vma;
1856 dst->symbol.flags = BSF_EXPORT | BSF_GLOBAL;
1857 dst->symbol.flags |= BSF_NOT_AT_END;
1859 /* Fall through to next case */
1867 if ((src->u.syment.n_scnum) == 0) {
1868 if ((src->u.syment.n_value) == 0) {
1869 dst->symbol.section = &bfd_und_section;
1870 dst->symbol.value= 0;
1873 dst->symbol.section = &bfd_com_section;
1874 dst->symbol.value = (src->u.syment.n_value);
1879 Base the value as an index from the base of the
1883 dst->symbol.flags = BSF_EXPORT | BSF_GLOBAL;
1884 dst->symbol.value = src->u.syment.n_value - dst->symbol.section->vma;
1886 if (ISFCN((src->u.syment.n_type))) {
1888 A function ext does not go at the end of a file
1890 dst->symbol.flags |= BSF_NOT_AT_END;
1897 case C_STAT: /* static */
1899 case C_LEAFSTAT: /* static leaf procedure */
1901 case C_LABEL: /* label */
1902 if (src->u.syment.n_scnum == -2)
1903 dst->symbol.flags = BSF_DEBUGGING;
1905 dst->symbol.flags = BSF_LOCAL;
1907 Base the value as an index from the base of the section, if
1910 if (dst->symbol.section)
1911 dst->symbol.value = (src->u.syment.n_value) -
1912 dst->symbol.section->vma;
1914 dst->symbol.value = (src->u.syment.n_value) ;
1917 case C_MOS: /* member of structure */
1918 case C_EOS: /* end of structure */
1919 #ifdef NOTDEF /* C_AUTOARG has the same value */
1921 case C_GLBLREG: /* A29k-specific storage class */
1924 case C_REGPARM: /* register parameter */
1925 case C_REG: /* register variable */
1927 case C_AUTOARG: /* 960-specific storage class */
1929 case C_TPDEF: /* type definition */
1931 case C_AUTO: /* automatic variable */
1932 case C_FIELD: /* bit field */
1933 case C_ENTAG: /* enumeration tag */
1934 case C_MOE: /* member of enumeration */
1935 case C_MOU: /* member of union */
1936 case C_UNTAG: /* union tag */
1937 dst->symbol.flags = BSF_DEBUGGING;
1938 dst->symbol.value = (src->u.syment.n_value);
1941 case C_FILE: /* file name */
1942 case C_STRTAG: /* structure tag */
1944 case C_BINCL: /* beginning of include file */
1945 case C_EINCL: /* ending of include file */
1958 dst->symbol.flags = BSF_DEBUGGING;
1959 dst->symbol.value = (src->u.syment.n_value);
1962 case C_BLOCK: /* ".bb" or ".eb" */
1963 case C_FCN: /* ".bf" or ".ef" */
1964 case C_EFCN: /* physical end of function */
1965 dst->symbol.flags = BSF_LOCAL;
1967 Base the value as an index from the base of the section
1969 dst->symbol.value = (src->u.syment.n_value) - dst->symbol.section->vma;
1973 case C_EXTDEF: /* external definition */
1974 case C_ULABEL: /* undefined label */
1975 case C_USTATIC: /* undefined static */
1976 case C_LINE: /* line # reformatted as symbol table entry */
1977 case C_ALIAS: /* duplicate tag */
1978 case C_HIDDEN: /* ext symbol in dmert public lib */
1981 fprintf(stderr,"Unrecognized storage class %d\n",
1982 src->u.syment.n_sclass);
1984 dst->symbol.flags = BSF_DEBUGGING;
1985 dst->symbol.value = (src->u.syment.n_value);
1989 /* BFD_ASSERT(dst->symbol.flags != 0);*/
1993 dst->symbol.udata = 0;
1994 dst->lineno = (alent *) NULL;
1995 this_index += (src->u.syment.n_numaux) + 1;
1997 number_of_symbols++;
1998 } /* walk the native symtab */
1999 } /* bfdize the native symtab */
2001 obj_symbols(abfd) = cached_area;
2002 obj_raw_syments(abfd) = native_symbols;
2004 obj_conv_table_size (abfd) = bfd_get_symcount (abfd);
2005 bfd_get_symcount(abfd) = number_of_symbols;
2006 obj_convert(abfd) = table_ptr;
2007 /* Slurp the line tables for each section too */
2012 coff_slurp_line_table(abfd, p);
2017 } /* coff_slurp_symbol_table() */
2023 Coff relocations are easily transformed into the internal BFD form
2026 Reading a coff relocation table is done in the following stages:
2028 o The entire coff relocation table is read into memory.
2030 o Each relocation is processed in turn, first it is swapped from the
2031 external to the internal form.
2033 o The symbol referenced in the relocation's symbol index is
2034 turned intoa pointer into the canonical symbol table. Note
2035 that this table is the same as the one returned by a call to
2036 @code{bfd_canonicalize_symtab}. The back end will call the
2037 routine and save the result if a canonicalization hasn't been done.
2039 o The reloc index is turned into a pointer to a howto
2040 structure, in a back end specific way. For instance, the 386
2041 and 960 use the @code{r_type} to directly produce an index
2042 into a howto table vector; the 88k subtracts a number from the
2043 @code{r_type} field and creates an addend field.
2049 #define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
2050 if (ptr && bfd_asymbol_bfd(ptr) == abfd \
2051 && ((ptr->flags & BSF_OLD_COMMON)== 0)) \
2053 cache_ptr->addend = -(ptr->section->vma + ptr->value); \
2056 cache_ptr->addend = 0; \
2061 DEFUN(coff_slurp_reloc_table,(abfd, asect, symbols),
2066 RELOC *native_relocs;
2067 arelent *reloc_cache;
2072 if (asect->relocation)
2074 if (asect->reloc_count == 0)
2076 if (asect->flags & SEC_CONSTRUCTOR)
2078 if (!coff_slurp_symbol_table(abfd))
2081 (RELOC *) buy_and_read(abfd,
2085 asect->reloc_count));
2086 reloc_cache = (arelent *)
2087 bfd_alloc(abfd, (size_t) (asect->reloc_count * sizeof(arelent)));
2089 if (reloc_cache == NULL) {
2090 bfd_error = no_memory;
2095 for (idx = 0; idx < asect->reloc_count; idx ++)
2097 #ifdef RELOC_PROCESSING
2098 struct internal_reloc dst;
2099 struct external_reloc *src;
2101 cache_ptr = reloc_cache + idx;
2102 src = native_relocs + idx;
2103 bfd_swap_reloc_in(abfd, src, &dst);
2105 RELOC_PROCESSING(cache_ptr, &dst, symbols, abfd, asect);
2107 struct internal_reloc dst;
2109 struct external_reloc *src;
2111 cache_ptr = reloc_cache + idx;
2112 src = native_relocs + idx;
2114 bfd_swap_reloc_in(abfd, src, &dst);
2117 cache_ptr->address = dst.r_vaddr;
2119 if (dst.r_symndx != -1)
2121 /* @@ Should never be greater than count of symbols! */
2122 if (dst.r_symndx >= obj_conv_table_size (abfd))
2124 cache_ptr->sym_ptr_ptr = symbols + obj_convert(abfd)[dst.r_symndx];
2125 ptr = *(cache_ptr->sym_ptr_ptr);
2129 cache_ptr->sym_ptr_ptr= bfd_abs_section.symbol_ptr_ptr;
2134 The symbols definitions that we have read in have been
2135 relocated as if their sections started at 0. But the offsets
2136 refering to the symbols in the raw data have not been
2137 modified, so we have to have a negative addend to compensate.
2139 Note that symbols which used to be common must be left alone */
2141 /* Calculate any reloc addend by looking at the symbol */
2142 CALC_ADDEND(abfd, ptr, dst, cache_ptr);
2144 cache_ptr->address -= asect->vma;
2145 /* !! cache_ptr->section = (asection *) NULL;*/
2147 /* Fill in the cache_ptr->howto field from dst.r_type */
2148 RTYPE2HOWTO(cache_ptr, &dst);
2153 asect->relocation = reloc_cache;
2158 /* This is stupid. This function should be a boolean predicate */
2160 DEFUN(coff_canonicalize_reloc, (abfd, section, relptr, symbols),
2163 arelent **relptr AND
2166 arelent *tblptr = section->relocation;
2167 unsigned int count = 0;
2170 if (section->flags & SEC_CONSTRUCTOR)
2172 /* this section has relocs made up by us, they are not in the
2173 file, so take them out of their chain and place them into
2174 the data area provided */
2175 arelent_chain *chain = section->constructor_chain;
2176 for (count = 0; count < section->reloc_count; count ++)
2178 *relptr ++ = &chain->relent;
2179 chain = chain->next;
2185 coff_slurp_reloc_table(abfd, section, symbols);
2188 tblptr = section->relocation;
2192 for (; count++ < section->reloc_count;)
2193 *relptr++ = tblptr++;
2198 return section->reloc_count;
2203 coff_sym_filepos(abfd)
2206 return obj_sym_filepos(abfd);
2210 #ifndef coff_reloc16_extra_cases
2211 #define coff_reloc16_extra_cases \
2212 (void (*) PARAMS ((bfd *, bfd_seclet_type *, arelent *, bfd_byte *,\
2213 unsigned int *, unsigned int *))) abort
2216 static CONST bfd_coff_backend_data bfd_coff_std_swap_table = {
2217 coff_swap_aux_in, coff_swap_sym_in, coff_swap_lineno_in,
2218 coff_swap_aux_out, coff_swap_sym_out,
2219 coff_swap_lineno_out, coff_swap_reloc_out,
2220 coff_swap_filehdr_out, coff_swap_aouthdr_out,
2221 coff_swap_scnhdr_out,
2222 FILHSZ, AOUTSZ, SCNHSZ, SYMESZ, AUXESZ, LINESZ,
2223 #ifdef COFF_LONG_FILENAMES
2228 coff_swap_filehdr_in, coff_swap_aouthdr_in, coff_swap_scnhdr_in,
2229 coff_bad_format_hook, coff_set_arch_mach_hook, coff_mkobject_hook,
2230 styp_to_sec_flags, coff_make_section_hook, coff_set_alignment_hook,
2231 coff_slurp_symbol_table, symname_in_debug_hook, coff_reloc16_extra_cases
2234 #define coff_core_file_failing_command _bfd_dummy_core_file_failing_command
2235 #define coff_core_file_failing_signal _bfd_dummy_core_file_failing_signal
2236 #define coff_core_file_matches_executable_p _bfd_dummy_core_file_matches_executable_p
2237 #define coff_slurp_armap bfd_slurp_coff_armap
2238 #define coff_slurp_extended_name_table _bfd_slurp_extended_name_table
2239 #define coff_truncate_arname bfd_dont_truncate_arname
2240 #define coff_openr_next_archived_file bfd_generic_openr_next_archived_file
2241 #define coff_generic_stat_arch_elt bfd_generic_stat_arch_elt
2242 #define coff_get_section_contents bfd_generic_get_section_contents
2243 #define coff_close_and_cleanup bfd_generic_close_and_cleanup
2245 #define coff_bfd_debug_info_start bfd_void
2246 #define coff_bfd_debug_info_end bfd_void
2247 #define coff_bfd_debug_info_accumulate \
2248 (void (*) PARAMS ((bfd *, struct sec *))) bfd_void
2249 #define coff_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
2250 #define coff_bfd_relax_section bfd_generic_relax_section
2251 #define coff_bfd_seclet_link bfd_generic_seclet_link
2252 #define coff_bfd_reloc_type_lookup \
2253 ((CONST struct reloc_howto_struct *(*) PARAMS ((bfd *, bfd_reloc_code_real_type))) bfd_nullvoidptr)