1 /* BFD back-end data structures for a.out (and similar) files.
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. */
21 /* We try to encapsulate the differences in the various a.out file
22 variants in a few routines, and otherwise share large masses of code.
23 This means we only have to fix bugs in one place, most of the time. */
25 /* Parameterize the a.out code based on whether it is being built
26 for a 32-bit architecture or a 64-bit architecture. */
28 #define GET_WORD bfd_h_get_64
29 #define GET_SWORD bfd_h_get_signed_64
30 #define PUT_WORD bfd_h_put_64
32 #define NAME(x,y) CAT3(x,_64_,y)
34 #define JNAME(x) CAT(x,_64)
35 #define BYTES_IN_WORD 8
36 #else /* ARCH_SIZE == 32 */
37 #define GET_WORD bfd_h_get_32
38 #define GET_SWORD bfd_h_get_signed_32
39 #define PUT_WORD bfd_h_put_32
41 #define NAME(x,y) CAT3(x,_32_,y)
43 #define JNAME(x) CAT(x,_32)
44 #define BYTES_IN_WORD 4
45 #endif /* ARCH_SIZE==32 */
47 /* Declare at file level, since used in parameter lists, which have
50 struct external_nlist;
51 struct reloc_ext_external;
52 struct reloc_std_external;
54 /* Back-end information for various a.out targets. */
55 struct aout_backend_data
57 /* Are ZMAGIC files mapped contiguously? If so, the text section may
58 need more padding, if the segment size (granularity for memory access
59 control) is larger than the page size. */
60 unsigned char zmagic_mapped_contiguous;
61 /* If this flag is set, ZMAGIC/NMAGIC file headers get mapped in with the
62 text section, which starts immediately after the file header.
63 If not, the text section starts on the next page. */
64 unsigned char text_includes_header;
66 /* If the text section VMA isn't specified, and we need an absolute
67 address, use this as the default. If we're producing a relocatable
68 file, zero is always used. */
69 /* ?? Perhaps a callback would be a better choice? Will this do anything
70 reasonable for a format that handles multiple CPUs with different
71 load addresses for each? */
72 bfd_vma default_text_vma;
74 /* Callback for setting the page and segment sizes, if they can't be
75 trivially determined from the architecture. */
76 boolean (*set_sizes) PARAMS ((bfd *));
78 /* zmagic files only. For go32, the length of the exec header contributes
79 to the size of the text section in the file for alignment purposes but
80 does *not* get counted in the length of the text section. */
81 unsigned char exec_header_not_counted;
83 #define aout_backend_info(abfd) \
84 ((CONST struct aout_backend_data *)((abfd)->xvec->backend_data))
86 /* This is the layout in memory of a "struct exec" while we process it.
87 All 'lengths' are given as a number of bytes.
88 All 'alignments' are for relinkable files only; an alignment of
89 'n' indicates the corresponding segment must begin at an
90 address that is a multiple of (2**n). */
94 long a_info; /* Magic number and flags, packed */
95 bfd_vma a_text; /* length of text, in bytes */
96 bfd_vma a_data; /* length of data, in bytes */
97 bfd_vma a_bss; /* length of uninitialized data area in mem */
98 bfd_vma a_syms; /* length of symbol table data in file */
99 bfd_vma a_entry; /* start address */
100 bfd_vma a_trsize; /* length of text's relocation info, in bytes */
101 bfd_vma a_drsize; /* length of data's relocation info, in bytes */
103 bfd_vma a_tload; /* Text runtime load address */
104 bfd_vma a_dload; /* Data runtime load address */
105 unsigned char a_talign; /* Alignment of text segment */
106 unsigned char a_dalign; /* Alignment of data segment */
107 unsigned char a_balign; /* Alignment of bss segment */
108 char a_relaxable; /* Enough info for linker relax */
111 /* Magic number is written
113 3130292827262524232221201918171615141312111009080706050403020100
114 < FLAGS >< MACHINE TYPE >< MAGIC NUMBER >
116 /* Magic number for NetBSD is
118 3130292827262524232221201918171615141312111009080706050403020100
119 < FLAGS >< >< MAGIC NUMBER >
127 /* skip a bunch so we don't run into any of suns numbers */
129 M_29K = 101, /* AMD 29000 */
130 M_386_DYNIX = 102, /* Sequent running dynix */
131 M_386_NETBSD = 134, /* NetBSD/386 binary */
132 M_MIPS1 = 151, /* MIPS R2000/R3000 binary */
133 M_MIPS2 = 152, /* MIPS R4000/R6000 binary */
134 M_HP200 = 200, /* HP 200 (68010) BSD binary */
135 M_HP300 = (300 % 256), /* HP 300 (68020+68881) BSD binary */
136 M_HPUX = (0x20c % 256)/* HP 200/300 HPUX binary */
139 #define N_DYNAMIC(exec) ((exec).a_info & 0x80000000)
142 # define N_MAGIC(exec) ((exec).a_info & 0xffff)
146 # define N_MACHTYPE(exec) ((enum machine_type)(((exec).a_info >> 16) & 0xff))
150 # define N_FLAGS(exec) (((exec).a_info >> 24) & 0xff)
154 # define N_SET_INFO(exec, magic, type, flags) \
155 ((exec).a_info = ((magic) & 0xffff) \
156 | (((int)(type) & 0xff) << 16) \
157 | (((flags) & 0xff) << 24))
160 #ifndef N_SET_DYNAMIC
161 # define N_SET_DYNAMIC(exec, dynamic) \
162 ((exec).a_info = (dynamic) ? ((exec).a_info | 0x80000000) : \
163 ((exec).a_info & 0x7fffffff))
167 # define N_SET_MAGIC(exec, magic) \
168 ((exec).a_info = (((exec).a_info & 0xffff0000) | ((magic) & 0xffff)))
171 #ifndef N_SET_MACHTYPE
172 # define N_SET_MACHTYPE(exec, machtype) \
174 ((exec).a_info&0xff00ffff) | ((((int)(machtype))&0xff) << 16))
178 # define N_SET_FLAGS(exec, flags) \
180 ((exec).a_info&0x00ffffff) | (((flags) & 0xff) << 24))
183 typedef struct aout_symbol {
190 /* The `tdata' struct for all a.out-like object file formats.
191 Various things depend on this struct being around any time an a.out
192 file is being handled. An example is dbxread.c in GDB. */
195 struct internal_exec *hdr; /* exec file header */
196 aout_symbol_type *symbols; /* symtab for input bfd */
198 /* For ease, we do this */
203 /* We remember these offsets so that after check_file_format, we have
204 no dependencies on the particular format of the exec_hdr. */
205 file_ptr sym_filepos;
206 file_ptr str_filepos;
208 /* Size of a relocation entry in external form */
209 unsigned reloc_entry_size;
211 /* Size of a symbol table entry in external form */
212 unsigned symbol_entry_size;
214 /* Page size - needed for alignment of demand paged files. */
215 unsigned long page_size;
217 /* Segment size - needed for alignment of demand paged files. */
218 unsigned long segment_size;
220 unsigned exec_bytes_size;
221 unsigned vma_adjusted : 1;
223 /* used when a bfd supports several highly similar formats */
226 gnu_encap_format } subformat;
234 /* The external symbol information. */
235 struct external_nlist *external_syms;
236 bfd_size_type external_sym_count;
237 char *external_strings;
238 bfd_size_type external_string_size;
239 struct aout_link_hash_entry **sym_hashes;
241 /* A pointer for shared library information. */
245 struct aout_data_struct {
247 struct internal_exec e;
250 #define adata(bfd) ((bfd)->tdata.aout_data->a)
251 #define exec_hdr(bfd) (adata(bfd).hdr)
252 #define obj_aout_symbols(bfd) (adata(bfd).symbols)
253 #define obj_textsec(bfd) (adata(bfd).textsec)
254 #define obj_datasec(bfd) (adata(bfd).datasec)
255 #define obj_bsssec(bfd) (adata(bfd).bsssec)
256 #define obj_sym_filepos(bfd) (adata(bfd).sym_filepos)
257 #define obj_str_filepos(bfd) (adata(bfd).str_filepos)
258 #define obj_reloc_entry_size(bfd) (adata(bfd).reloc_entry_size)
259 #define obj_symbol_entry_size(bfd) (adata(bfd).symbol_entry_size)
260 #define obj_aout_subformat(bfd) (adata(bfd).subformat)
261 #define obj_aout_external_syms(bfd) (adata(bfd).external_syms)
262 #define obj_aout_external_sym_count(bfd) (adata(bfd).external_sym_count)
263 #define obj_aout_external_strings(bfd) (adata(bfd).external_strings)
264 #define obj_aout_external_string_size(bfd) (adata(bfd).external_string_size)
265 #define obj_aout_sym_hashes(bfd) (adata(bfd).sym_hashes)
266 #define obj_aout_dynamic_info(bfd) (adata(bfd).dynamic_info)
268 /* We take the address of the first element of an asymbol to ensure that the
269 macro is only ever applied to an asymbol */
270 #define aout_symbol(asymbol) ((aout_symbol_type *)(&(asymbol)->the_bfd))
272 /* Prototype declarations for functions defined in aoutx.h */
275 NAME(aout,squirt_out_relocs) PARAMS ((bfd *abfd, asection *section));
278 NAME(aout,some_aout_object_p) PARAMS ((bfd *abfd,
279 struct internal_exec *execp,
280 bfd_target * (*callback)(bfd *)));
283 NAME(aout,mkobject) PARAMS ((bfd *abfd));
286 NAME(aout,machine_type) PARAMS ((enum bfd_architecture arch,
287 unsigned long machine));
290 NAME(aout,set_arch_mach) PARAMS ((bfd *abfd, enum bfd_architecture arch,
291 unsigned long machine));
294 NAME(aout,new_section_hook) PARAMS ((bfd *abfd, asection *newsect));
297 NAME(aout,set_section_contents) PARAMS ((bfd *abfd, sec_ptr section,
298 PTR location, file_ptr offset, bfd_size_type count));
301 NAME(aout,make_empty_symbol) PARAMS ((bfd *abfd));
304 NAME(aout,translate_symbol_table) PARAMS ((bfd *, aout_symbol_type *,
305 struct external_nlist *,
306 bfd_size_type, char *,
311 NAME(aout,slurp_symbol_table) PARAMS ((bfd *abfd));
314 NAME(aout,write_syms) PARAMS ((bfd *abfd));
317 NAME(aout,reclaim_symbol_table) PARAMS ((bfd *abfd));
320 NAME(aout,get_symtab_upper_bound) PARAMS ((bfd *abfd));
323 NAME(aout,get_symtab) PARAMS ((bfd *abfd, asymbol **location));
326 NAME(aout,swap_ext_reloc_in) PARAMS ((bfd *, struct reloc_ext_external *,
327 arelent *, asymbol **));
329 NAME(aout,swap_std_reloc_in) PARAMS ((bfd *, struct reloc_std_external *,
330 arelent *, asymbol **));
333 NAME(aout,slurp_reloc_table) PARAMS ((bfd *abfd, sec_ptr asect,
337 NAME(aout,canonicalize_reloc) PARAMS ((bfd *abfd, sec_ptr section,
338 arelent **relptr, asymbol **symbols));
341 NAME(aout,get_reloc_upper_bound) PARAMS ((bfd *abfd, sec_ptr asect));
344 NAME(aout,reclaim_reloc) PARAMS ((bfd *ignore_abfd, sec_ptr ignore));
347 NAME(aout,get_lineno) PARAMS ((bfd *ignore_abfd, asymbol *ignore_symbol));
350 NAME(aout,print_symbol) PARAMS ((bfd *ignore_abfd, PTR file,
351 asymbol *symbol, bfd_print_symbol_type how));
354 NAME(aout,get_symbol_info) PARAMS ((bfd *ignore_abfd,
355 asymbol *symbol, symbol_info *ret));
358 NAME(aout,find_nearest_line) PARAMS ((bfd *abfd, asection *section,
359 asymbol **symbols, bfd_vma offset, CONST char **filename_ptr,
360 CONST char **functionname_ptr, unsigned int *line_ptr));
363 NAME(aout,sizeof_headers) PARAMS ((bfd *abfd, boolean exec));
366 NAME(aout,adjust_sizes_and_vmas) PARAMS ((bfd *abfd,
367 bfd_size_type *text_size, file_ptr *text_end));
370 NAME(aout,swap_exec_header_in) PARAMS ((bfd *abfd,
371 struct external_exec *raw_bytes, struct internal_exec *execp));
374 NAME(aout,swap_exec_header_out) PARAMS ((bfd *abfd,
375 struct internal_exec *execp, struct external_exec *raw_bytes));
377 struct bfd_link_hash_table *
378 NAME(aout,link_hash_table_create) PARAMS ((bfd *));
381 NAME(aout,link_add_symbols) PARAMS ((bfd *, struct bfd_link_info *));
384 NAME(aout,final_link) PARAMS ((bfd *, struct bfd_link_info *,
385 void (*) (bfd *, file_ptr *, file_ptr *,
389 NAME(aout,bfd_free_cached_info) PARAMS ((bfd *));
391 /* Prototypes for functions in stab-syms.c. */
394 aout_stab_name PARAMS ((int code));
396 /* A.out uses the generic versions of these routines... */
398 #define aout_32_get_section_contents _bfd_generic_get_section_contents
400 #define aout_64_get_section_contents _bfd_generic_get_section_contents
401 #ifndef NO_WRITE_HEADER_KLUDGE
402 #define NO_WRITE_HEADER_KLUDGE 0
405 #ifndef aout_32_bfd_is_local_label
406 #define aout_32_bfd_is_local_label bfd_generic_is_local_label
409 #ifndef WRITE_HEADERS
410 #define WRITE_HEADERS(abfd, execp) \
412 bfd_size_type text_size; /* dummy vars */ \
414 if (adata(abfd).magic == undecided_magic) \
415 NAME(aout,adjust_sizes_and_vmas) (abfd, &text_size, &text_end); \
417 execp->a_syms = bfd_get_symcount (abfd) * EXTERNAL_NLIST_SIZE; \
418 execp->a_entry = bfd_get_start_address (abfd); \
420 execp->a_trsize = ((obj_textsec (abfd)->reloc_count) * \
421 obj_reloc_entry_size (abfd)); \
422 execp->a_drsize = ((obj_datasec (abfd)->reloc_count) * \
423 obj_reloc_entry_size (abfd)); \
424 NAME(aout,swap_exec_header_out) (abfd, execp, &exec_bytes); \
426 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0) return false; \
427 if (bfd_write ((PTR) &exec_bytes, 1, EXEC_BYTES_SIZE, abfd) \
428 != EXEC_BYTES_SIZE) \
430 /* Now write out reloc info, followed by syms and strings */ \
432 if (bfd_get_outsymbols (abfd) != (asymbol **) NULL \
433 && bfd_get_symcount (abfd) != 0) \
435 if (bfd_seek (abfd, (file_ptr)(N_SYMOFF(*execp)), SEEK_SET) \
439 if (! NAME(aout,write_syms)(abfd)) return false; \
441 if (bfd_seek (abfd, (file_ptr)(N_TRELOFF(*execp)), SEEK_SET) \
445 if (!NAME(aout,squirt_out_relocs) (abfd, obj_textsec (abfd))) \
447 if (bfd_seek (abfd, (file_ptr)(N_DRELOFF(*execp)), SEEK_SET) \
451 if (!NAME(aout,squirt_out_relocs)(abfd, obj_datasec (abfd))) \