1 /* ELF executable support for BFD.
2 Copyright 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
4 Written by Fred Fish @ Cygnus Support, from information published
5 in "UNIX System V Release 4, Programmers Guide: ANSI C and
6 Programming Support Tools". Sufficient support for gdb.
8 Rewritten by Mark Eichin @ Cygnus Support, from information
9 published in "System V Application Binary Interface", chapters 4
10 and 5, as well as the various "Processor Supplement" documents
11 derived from it. Added support for assembler and other object file
12 utilities. Further work done by Ken Raeburn (Cygnus Support), Michael
13 Meissner (Open Software Foundation), and Peter Hoogenboom (University
14 of Utah) to finish and extend this.
16 This file is part of BFD, the Binary File Descriptor library.
18 This program is free software; you can redistribute it and/or modify
19 it under the terms of the GNU General Public License as published by
20 the Free Software Foundation; either version 2 of the License, or
21 (at your option) any later version.
23 This program is distributed in the hope that it will be useful,
24 but WITHOUT ANY WARRANTY; without even the implied warranty of
25 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 GNU General Public License for more details.
28 You should have received a copy of the GNU General Public License
29 along with this program; if not, write to the Free Software
30 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
32 /* Problems and other issues to resolve.
34 (1) BFD expects there to be some fixed number of "sections" in
35 the object file. I.E. there is a "section_count" variable in the
36 bfd structure which contains the number of sections. However, ELF
37 supports multiple "views" of a file. In particular, with current
38 implementations, executable files typically have two tables, a
39 program header table and a section header table, both of which
40 partition the executable.
42 In ELF-speak, the "linking view" of the file uses the section header
43 table to access "sections" within the file, and the "execution view"
44 uses the program header table to access "segments" within the file.
45 "Segments" typically may contain all the data from one or more
48 Note that the section header table is optional in ELF executables,
49 but it is this information that is most useful to gdb. If the
50 section header table is missing, then gdb should probably try
51 to make do with the program header table. (FIXME)
53 (2) The code in this file is compiled twice, once in 32-bit mode and
54 once in 64-bit mode. More of it should be made size-independent
57 (3) ELF section symbols are handled rather sloppily now. This should
58 be cleaned up, and ELF section symbols reconciled with BFD section
62 #include <string.h> /* For strrchr and friends */
68 /* Renaming structures, typedefs, macros and functions to be size-specific. */
69 #define Elf_External_Ehdr NAME(Elf,External_Ehdr)
70 #define Elf_External_Sym NAME(Elf,External_Sym)
71 #define Elf_External_Shdr NAME(Elf,External_Shdr)
72 #define Elf_External_Phdr NAME(Elf,External_Phdr)
73 #define Elf_External_Rel NAME(Elf,External_Rel)
74 #define Elf_External_Rela NAME(Elf,External_Rela)
76 #define elf_core_file_failing_command NAME(bfd_elf,core_file_failing_command)
77 #define elf_core_file_failing_signal NAME(bfd_elf,core_file_failing_signal)
78 #define elf_core_file_matches_executable_p NAME(bfd_elf,core_file_matches_executable_p)
79 #define elf_object_p NAME(bfd_elf,object_p)
80 #define elf_core_file_p NAME(bfd_elf,core_file_p)
81 #define elf_get_symtab_upper_bound NAME(bfd_elf,get_symtab_upper_bound)
82 #define elf_get_reloc_upper_bound NAME(bfd_elf,get_reloc_upper_bound)
83 #define elf_canonicalize_reloc NAME(bfd_elf,canonicalize_reloc)
84 #define elf_get_symtab NAME(bfd_elf,get_symtab)
85 #define elf_make_empty_symbol NAME(bfd_elf,make_empty_symbol)
86 #define elf_get_symbol_info NAME(bfd_elf,get_symbol_info)
87 #define elf_print_symbol NAME(bfd_elf,print_symbol)
88 #define elf_get_lineno NAME(bfd_elf,get_lineno)
89 #define elf_set_arch_mach NAME(bfd_elf,set_arch_mach)
90 #define elf_find_nearest_line NAME(bfd_elf,find_nearest_line)
91 #define elf_sizeof_headers NAME(bfd_elf,sizeof_headers)
92 #define elf_set_section_contents NAME(bfd_elf,set_section_contents)
93 #define elf_no_info_to_howto NAME(bfd_elf,no_info_to_howto)
94 #define elf_no_info_to_howto_rel NAME(bfd_elf,no_info_to_howto_rel)
95 #define elf_new_section_hook NAME(bfd_elf,new_section_hook)
96 #define write_relocs NAME(bfd_elf,_write_relocs)
97 #define elf_find_section NAME(bfd_elf,find_section)
100 #define ELF_R_INFO(X,Y) ELF64_R_INFO(X,Y)
101 #define ELF_R_SYM(X) ELF64_R_SYM(X)
102 #define ELFCLASS ELFCLASS64
106 #define ELF_R_INFO(X,Y) ELF32_R_INFO(X,Y)
107 #define ELF_R_SYM(X) ELF32_R_SYM(X)
108 #define ELFCLASS ELFCLASS32
112 static int shstrtab_length_fixed;
120 /* Forward declarations of static functions */
122 static struct sec *section_from_elf_index PARAMS ((bfd *, unsigned int));
124 static int elf_section_from_bfd_section PARAMS ((bfd *, struct sec *));
126 static boolean elf_slurp_symbol_table PARAMS ((bfd *, asymbol **));
128 static int elf_symbol_from_bfd_symbol PARAMS ((bfd *,
129 struct symbol_cache_entry **));
131 static boolean elf_map_symbols PARAMS ((bfd *));
132 static boolean swap_out_syms PARAMS ((bfd *));
135 static void elf_debug_section PARAMS ((char *, int, Elf_Internal_Shdr *));
136 static void elf_debug_file PARAMS ((Elf_Internal_Ehdr *));
139 #define elf_string_from_elf_strtab(abfd,strindex) \
140 elf_string_from_elf_section(abfd,elf_elfheader(abfd)->e_shstrndx,strindex)
143 /* Structure swapping routines */
145 /* Should perhaps use put_offset, put_word, etc. For now, the two versions
146 can be handled by explicitly specifying 32 bits or "the long type". */
148 #define put_word bfd_h_put_64
149 #define get_word bfd_h_get_64
152 #define put_word bfd_h_put_32
153 #define get_word bfd_h_get_32
156 /* Translate an ELF symbol in external format into an ELF symbol in internal
160 elf_swap_symbol_in (abfd, src, dst)
162 Elf_External_Sym *src;
163 Elf_Internal_Sym *dst;
165 dst->st_name = bfd_h_get_32 (abfd, (bfd_byte *) src->st_name);
166 dst->st_value = get_word (abfd, (bfd_byte *) src->st_value);
167 dst->st_size = get_word (abfd, (bfd_byte *) src->st_size);
168 dst->st_info = bfd_h_get_8 (abfd, (bfd_byte *) src->st_info);
169 dst->st_other = bfd_h_get_8 (abfd, (bfd_byte *) src->st_other);
170 dst->st_shndx = bfd_h_get_16 (abfd, (bfd_byte *) src->st_shndx);
173 /* Translate an ELF symbol in internal format into an ELF symbol in external
177 elf_swap_symbol_out (abfd, src, dst)
179 Elf_Internal_Sym *src;
180 Elf_External_Sym *dst;
182 bfd_h_put_32 (abfd, src->st_name, dst->st_name);
183 put_word (abfd, src->st_value, dst->st_value);
184 put_word (abfd, src->st_size, dst->st_size);
185 bfd_h_put_8 (abfd, src->st_info, dst->st_info);
186 bfd_h_put_8 (abfd, src->st_other, dst->st_other);
187 bfd_h_put_16 (abfd, src->st_shndx, dst->st_shndx);
191 /* Translate an ELF file header in external format into an ELF file header in
195 elf_swap_ehdr_in (abfd, src, dst)
197 Elf_External_Ehdr *src;
198 Elf_Internal_Ehdr *dst;
200 memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
201 dst->e_type = bfd_h_get_16 (abfd, (bfd_byte *) src->e_type);
202 dst->e_machine = bfd_h_get_16 (abfd, (bfd_byte *) src->e_machine);
203 dst->e_version = bfd_h_get_32 (abfd, (bfd_byte *) src->e_version);
204 dst->e_entry = get_word (abfd, (bfd_byte *) src->e_entry);
205 dst->e_phoff = get_word (abfd, (bfd_byte *) src->e_phoff);
206 dst->e_shoff = get_word (abfd, (bfd_byte *) src->e_shoff);
207 dst->e_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->e_flags);
208 dst->e_ehsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_ehsize);
209 dst->e_phentsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_phentsize);
210 dst->e_phnum = bfd_h_get_16 (abfd, (bfd_byte *) src->e_phnum);
211 dst->e_shentsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shentsize);
212 dst->e_shnum = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shnum);
213 dst->e_shstrndx = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shstrndx);
216 /* Translate an ELF file header in internal format into an ELF file header in
220 elf_swap_ehdr_out (abfd, src, dst)
222 Elf_Internal_Ehdr *src;
223 Elf_External_Ehdr *dst;
225 memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
226 /* note that all elements of dst are *arrays of unsigned char* already... */
227 bfd_h_put_16 (abfd, src->e_type, dst->e_type);
228 bfd_h_put_16 (abfd, src->e_machine, dst->e_machine);
229 bfd_h_put_32 (abfd, src->e_version, dst->e_version);
230 put_word (abfd, src->e_entry, dst->e_entry);
231 put_word (abfd, src->e_phoff, dst->e_phoff);
232 put_word (abfd, src->e_shoff, dst->e_shoff);
233 bfd_h_put_32 (abfd, src->e_flags, dst->e_flags);
234 bfd_h_put_16 (abfd, src->e_ehsize, dst->e_ehsize);
235 bfd_h_put_16 (abfd, src->e_phentsize, dst->e_phentsize);
236 bfd_h_put_16 (abfd, src->e_phnum, dst->e_phnum);
237 bfd_h_put_16 (abfd, src->e_shentsize, dst->e_shentsize);
238 bfd_h_put_16 (abfd, src->e_shnum, dst->e_shnum);
239 bfd_h_put_16 (abfd, src->e_shstrndx, dst->e_shstrndx);
243 /* Translate an ELF section header table entry in external format into an
244 ELF section header table entry in internal format. */
247 elf_swap_shdr_in (abfd, src, dst)
249 Elf_External_Shdr *src;
250 Elf_Internal_Shdr *dst;
252 dst->sh_name = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_name);
253 dst->sh_type = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_type);
254 dst->sh_flags = get_word (abfd, (bfd_byte *) src->sh_flags);
255 dst->sh_addr = get_word (abfd, (bfd_byte *) src->sh_addr);
256 dst->sh_offset = get_word (abfd, (bfd_byte *) src->sh_offset);
257 dst->sh_size = get_word (abfd, (bfd_byte *) src->sh_size);
258 dst->sh_link = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_link);
259 dst->sh_info = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_info);
260 dst->sh_addralign = get_word (abfd, (bfd_byte *) src->sh_addralign);
261 dst->sh_entsize = get_word (abfd, (bfd_byte *) src->sh_entsize);
262 /* we haven't done any processing on it yet, so... */
263 dst->rawdata = (void *) 0;
266 /* Translate an ELF section header table entry in internal format into an
267 ELF section header table entry in external format. */
270 elf_swap_shdr_out (abfd, src, dst)
272 Elf_Internal_Shdr *src;
273 Elf_External_Shdr *dst;
275 /* note that all elements of dst are *arrays of unsigned char* already... */
276 bfd_h_put_32 (abfd, src->sh_name, dst->sh_name);
277 bfd_h_put_32 (abfd, src->sh_type, dst->sh_type);
278 put_word (abfd, src->sh_flags, dst->sh_flags);
279 put_word (abfd, src->sh_addr, dst->sh_addr);
280 put_word (abfd, src->sh_offset, dst->sh_offset);
281 put_word (abfd, src->sh_size, dst->sh_size);
282 bfd_h_put_32 (abfd, src->sh_link, dst->sh_link);
283 bfd_h_put_32 (abfd, src->sh_info, dst->sh_info);
284 put_word (abfd, src->sh_addralign, dst->sh_addralign);
285 put_word (abfd, src->sh_entsize, dst->sh_entsize);
289 /* Translate an ELF program header table entry in external format into an
290 ELF program header table entry in internal format. */
293 elf_swap_phdr_in (abfd, src, dst)
295 Elf_External_Phdr *src;
296 Elf_Internal_Phdr *dst;
298 dst->p_type = bfd_h_get_32 (abfd, (bfd_byte *) src->p_type);
299 dst->p_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->p_flags);
300 dst->p_offset = get_word (abfd, (bfd_byte *) src->p_offset);
301 dst->p_vaddr = get_word (abfd, (bfd_byte *) src->p_vaddr);
302 dst->p_paddr = get_word (abfd, (bfd_byte *) src->p_paddr);
303 dst->p_filesz = get_word (abfd, (bfd_byte *) src->p_filesz);
304 dst->p_memsz = get_word (abfd, (bfd_byte *) src->p_memsz);
305 dst->p_align = get_word (abfd, (bfd_byte *) src->p_align);
309 elf_swap_phdr_out (abfd, src, dst)
311 Elf_Internal_Phdr *src;
312 Elf_External_Phdr *dst;
314 /* note that all elements of dst are *arrays of unsigned char* already... */
315 bfd_h_put_32 (abfd, src->p_type, dst->p_type);
316 put_word (abfd, src->p_offset, dst->p_offset);
317 put_word (abfd, src->p_vaddr, dst->p_vaddr);
318 put_word (abfd, src->p_paddr, dst->p_paddr);
319 put_word (abfd, src->p_filesz, dst->p_filesz);
320 put_word (abfd, src->p_memsz, dst->p_memsz);
321 bfd_h_put_32 (abfd, src->p_flags, dst->p_flags);
322 put_word (abfd, src->p_align, dst->p_align);
325 /* Translate an ELF reloc from external format to internal format. */
327 elf_swap_reloc_in (abfd, src, dst)
329 Elf_External_Rel *src;
330 Elf_Internal_Rel *dst;
332 dst->r_offset = get_word (abfd, (bfd_byte *) src->r_offset);
333 dst->r_info = get_word (abfd, (bfd_byte *) src->r_info);
337 elf_swap_reloca_in (abfd, src, dst)
339 Elf_External_Rela *src;
340 Elf_Internal_Rela *dst;
342 dst->r_offset = get_word (abfd, (bfd_byte *) src->r_offset);
343 dst->r_info = get_word (abfd, (bfd_byte *) src->r_info);
344 dst->r_addend = get_word (abfd, (bfd_byte *) src->r_addend);
347 /* Translate an ELF reloc from internal format to external format. */
349 elf_swap_reloc_out (abfd, src, dst)
351 Elf_Internal_Rel *src;
352 Elf_External_Rel *dst;
354 put_word (abfd, src->r_offset, dst->r_offset);
355 put_word (abfd, src->r_info, dst->r_info);
359 elf_swap_reloca_out (abfd, src, dst)
361 Elf_Internal_Rela *src;
362 Elf_External_Rela *dst;
364 put_word (abfd, src->r_offset, dst->r_offset);
365 put_word (abfd, src->r_info, dst->r_info);
366 put_word (abfd, src->r_addend, dst->r_addend);
371 /* String table creation/manipulation routines */
373 static struct strtab *
374 bfd_new_strtab (abfd)
379 ss = (struct strtab *) malloc (sizeof (struct strtab));
382 bfd_set_error (bfd_error_no_memory);
385 ss->tab = malloc (1);
388 bfd_set_error (bfd_error_no_memory);
399 bfd_add_to_strtab (abfd, ss, str)
404 /* should search first, but for now: */
405 /* include the trailing NUL */
406 int ln = strlen (str) + 1;
408 /* should this be using obstacks? */
409 ss->tab = realloc (ss->tab, ss->length + ln);
411 BFD_ASSERT (ss->tab != 0); /* FIXME */
412 strcpy (ss->tab + ss->length, str);
416 return ss->length - ln;
420 bfd_add_2_to_strtab (abfd, ss, str, str2)
426 /* should search first, but for now: */
427 /* include the trailing NUL */
428 int ln = strlen (str) + strlen (str2) + 1;
430 /* should this be using obstacks? */
432 ss->tab = realloc (ss->tab, ss->length + ln);
434 ss->tab = malloc (ln);
436 BFD_ASSERT (ss->tab != 0); /* FIXME */
437 strcpy (ss->tab + ss->length, str);
438 strcpy (ss->tab + ss->length + strlen (str), str2);
442 return ss->length - ln;
446 /* ELF .o/exec file reading */
448 /* Create a new bfd section from an ELF section header. */
451 bfd_section_from_shdr (abfd, shindex)
453 unsigned int shindex;
455 Elf_Internal_Shdr *hdr = elf_elfsections (abfd)[shindex];
456 Elf_Internal_Ehdr *ehdr = elf_elfheader (abfd);
460 name = elf_string_from_elf_strtab (abfd, hdr->sh_name);
462 switch (hdr->sh_type)
466 /* inactive section. Throw it away. */
471 /* Bits that get saved. This one is real. */
474 newsect = bfd_make_section (abfd, name);
477 newsect->filepos = hdr->sh_offset; /* so we can read back the bits */
478 newsect->flags |= SEC_HAS_CONTENTS;
479 newsect->vma = hdr->sh_addr;
480 newsect->_raw_size = hdr->sh_size;
481 newsect->alignment_power = bfd_log2 (hdr->sh_addralign);
483 if (hdr->sh_flags & SHF_ALLOC)
485 newsect->flags |= SEC_ALLOC;
486 newsect->flags |= SEC_LOAD;
489 if (!(hdr->sh_flags & SHF_WRITE))
490 newsect->flags |= SEC_READONLY;
492 if (hdr->sh_flags & SHF_EXECINSTR)
493 newsect->flags |= SEC_CODE; /* FIXME: may only contain SOME code */
494 else if (newsect->flags & SEC_ALLOC)
495 newsect->flags |= SEC_DATA;
497 /* The debugging sections appear to recognized only by
499 if (strncmp (name, ".debug", sizeof ".debug" - 1) == 0
500 || strncmp (name, ".line", sizeof ".line" - 1) == 0
501 || strncmp (name, ".stab", sizeof ".stab" - 1) == 0)
502 newsect->flags |= SEC_DEBUGGING;
504 hdr->rawdata = (void *) newsect;
507 hdr->rawdata = (void *) bfd_get_section_by_name (abfd, name);
512 /* Bits that get saved. This one is real. */
515 newsect = bfd_make_section (abfd, name);
518 newsect->vma = hdr->sh_addr;
519 newsect->_raw_size = hdr->sh_size;
520 newsect->filepos = hdr->sh_offset; /* fake */
521 newsect->alignment_power = bfd_log2 (hdr->sh_addralign);
522 if (hdr->sh_flags & SHF_ALLOC)
523 newsect->flags |= SEC_ALLOC;
525 if (!(hdr->sh_flags & SHF_WRITE))
526 newsect->flags |= SEC_READONLY;
528 /* FIXME: This section is empty. Does it really make
529 sense to set SEC_CODE for it? */
530 if (hdr->sh_flags & SHF_EXECINSTR)
531 newsect->flags |= SEC_CODE; /* FIXME: may only contain SOME code */
533 hdr->rawdata = (void *) newsect;
538 case SHT_SYMTAB: /* A symbol table */
539 if (elf_onesymtab (abfd) == shindex)
542 BFD_ASSERT (hdr->sh_entsize == sizeof (Elf_External_Sym));
543 BFD_ASSERT (elf_onesymtab (abfd) == 0);
544 elf_onesymtab (abfd) = shindex;
545 elf_tdata (abfd)->symtab_hdr = *hdr;
546 elf_elfsections (abfd)[shindex] = &elf_tdata (abfd)->symtab_hdr;
547 abfd->flags |= HAS_SYMS;
550 case SHT_STRTAB: /* A string table */
553 if (ehdr->e_shstrndx == shindex)
555 elf_tdata (abfd)->shstrtab_hdr = *hdr;
556 elf_elfsections (abfd)[shindex] = &elf_tdata (abfd)->shstrtab_hdr;
557 hdr->rawdata = (PTR) & elf_tdata (abfd)->shstrtab_hdr;
563 for (i = 1; i < ehdr->e_shnum; i++)
565 Elf_Internal_Shdr *hdr2 = elf_elfsections (abfd)[i];
566 if (hdr2->sh_link == shindex)
568 bfd_section_from_shdr (abfd, i);
569 if (elf_onesymtab (abfd) == i)
571 elf_tdata (abfd)->strtab_hdr = *hdr;
572 elf_elfsections (abfd)[shindex] = &elf_tdata (abfd)->strtab_hdr;
575 #if 0 /* Not handling other string tables specially right now. */
576 hdr2 = elf_elfsections (abfd)[i]; /* in case it moved */
577 /* We have a strtab for some random other section. */
578 newsect = (asection *) hdr2->rawdata;
581 hdr->rawdata = (PTR) newsect;
582 hdr2 = &elf_section_data (newsect)->str_hdr;
584 elf_elfsections (abfd)[shindex] = hdr2;
590 newsect = bfd_make_section (abfd, name);
593 newsect->flags = SEC_HAS_CONTENTS;
594 hdr->rawdata = (PTR) newsect;
595 newsect->_raw_size = hdr->sh_size;
596 newsect->alignment_power = bfd_log2 (hdr->sh_addralign);
597 newsect->vma = hdr->sh_addr;
598 newsect->filepos = hdr->sh_offset;
600 if (hdr->sh_flags & SHF_ALLOC)
601 newsect->flags |= SEC_ALLOC | SEC_LOAD;
602 if (!(hdr->sh_flags & SHF_WRITE))
603 newsect->flags |= SEC_READONLY;
604 if (hdr->sh_flags & SHF_EXECINSTR)
605 newsect->flags |= SEC_CODE;
606 else if (newsect->flags & SEC_ALLOC)
607 newsect->flags |= SEC_DATA;
609 /* Check for debugging string tables. */
610 if (strncmp (name, ".debug", sizeof ".debug" - 1) == 0
611 || strncmp (name, ".stab", sizeof ".stab" - 1) == 0)
612 newsect->flags |= SEC_DEBUGGING;
619 /* *These* do a lot of work -- but build no sections!
620 The spec says there can be multiple strtabs, but only one symtab,
621 but there can be lots of REL* sections. */
622 /* FIXME: The above statement is wrong! There are typically at least
623 two symbol tables in a dynamically linked executable, ".dynsym"
624 which is the dynamic linkage symbol table and ".symtab", which is
625 the "traditional" symbol table. -fnf */
628 asection *target_sect;
629 Elf_Internal_Shdr *hdr2;
630 int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
632 /* Don't allow REL relocations on a machine that uses RELA and
634 /* @@ Actually, the generic ABI does suggest that both might be
635 used in one file. But the four ABI Processor Supplements I
636 have access to right now all specify that only one is used on
637 each of those architectures. It's conceivable that, e.g., a
638 bunch of absolute 32-bit relocs might be more compact in REL
639 form even on a RELA machine... */
640 BFD_ASSERT (!(use_rela_p && (hdr->sh_type == SHT_REL)));
641 BFD_ASSERT (!(!use_rela_p && (hdr->sh_type == SHT_RELA)));
642 BFD_ASSERT (hdr->sh_entsize ==
644 ? sizeof (Elf_External_Rela)
645 : sizeof (Elf_External_Rel)));
647 bfd_section_from_shdr (abfd, hdr->sh_info); /* target */
648 bfd_section_from_shdr (abfd, hdr->sh_link); /* symbol table */
649 target_sect = section_from_elf_index (abfd, hdr->sh_info);
650 if (target_sect == NULL
651 || elf_section_data (target_sect) == NULL)
654 hdr2 = &elf_section_data (target_sect)->rel_hdr;
656 elf_elfsections (abfd)[shindex] = hdr2;
657 target_sect->reloc_count = hdr->sh_size / hdr->sh_entsize;
658 target_sect->flags |= SEC_RELOC;
659 target_sect->relocation = 0;
660 target_sect->rel_filepos = hdr->sh_offset;
661 abfd->flags |= HAS_RELOC;
667 case SHT_DYNSYM: /* could treat this like symtab... */
669 fprintf (stderr, "Dynamic Linking sections not yet supported.\n");
676 fprintf (stderr, "Note Sections not yet supported.\n");
683 fprintf (stderr, "SHLIB Sections not supported (and non conforming.)\n");
688 /* Check for any processor-specific section types. */
690 struct elf_backend_data *bed = get_elf_backend_data (abfd);
692 if (bed->elf_backend_section_from_shdr)
693 (*bed->elf_backend_section_from_shdr) (abfd, hdr, name);
702 elf_new_section_hook (abfd, sec)
707 struct bfd_elf_section_data *sdata;
709 sdata = (struct bfd_elf_section_data *) bfd_alloc (abfd, sizeof (*sdata));
712 bfd_set_error (bfd_error_no_memory);
715 sec->used_by_bfd = (PTR) sdata;
716 memset (sdata, 0, sizeof (*sdata));
720 /* Create a new bfd section from an ELF program header.
722 Since program segments have no names, we generate a synthetic name
723 of the form segment<NUM>, where NUM is generally the index in the
724 program header table. For segments that are split (see below) we
725 generate the names segment<NUM>a and segment<NUM>b.
727 Note that some program segments may have a file size that is different than
728 (less than) the memory size. All this means is that at execution the
729 system must allocate the amount of memory specified by the memory size,
730 but only initialize it with the first "file size" bytes read from the
731 file. This would occur for example, with program segments consisting
732 of combined data+bss.
734 To handle the above situation, this routine generates TWO bfd sections
735 for the single program segment. The first has the length specified by
736 the file size of the segment, and the second has the length specified
737 by the difference between the two sizes. In effect, the segment is split
738 into it's initialized and uninitialized parts.
743 bfd_section_from_phdr (abfd, hdr, index)
745 Elf_Internal_Phdr *hdr;
753 split = ((hdr->p_memsz > 0) &&
754 (hdr->p_filesz > 0) &&
755 (hdr->p_memsz > hdr->p_filesz));
756 sprintf (namebuf, split ? "segment%da" : "segment%d", index);
757 name = bfd_alloc (abfd, strlen (namebuf) + 1);
760 bfd_set_error (bfd_error_no_memory);
763 strcpy (name, namebuf);
764 newsect = bfd_make_section (abfd, name);
765 newsect->vma = hdr->p_vaddr;
766 newsect->_raw_size = hdr->p_filesz;
767 newsect->filepos = hdr->p_offset;
768 newsect->flags |= SEC_HAS_CONTENTS;
769 if (hdr->p_type == PT_LOAD)
771 newsect->flags |= SEC_ALLOC;
772 newsect->flags |= SEC_LOAD;
773 if (hdr->p_flags & PF_X)
775 /* FIXME: all we known is that it has execute PERMISSION,
777 newsect->flags |= SEC_CODE;
780 if (!(hdr->p_flags & PF_W))
782 newsect->flags |= SEC_READONLY;
787 sprintf (namebuf, "segment%db", index);
788 name = bfd_alloc (abfd, strlen (namebuf) + 1);
791 bfd_set_error (bfd_error_no_memory);
794 strcpy (name, namebuf);
795 newsect = bfd_make_section (abfd, name);
796 newsect->vma = hdr->p_vaddr + hdr->p_filesz;
797 newsect->_raw_size = hdr->p_memsz - hdr->p_filesz;
798 if (hdr->p_type == PT_LOAD)
800 newsect->flags |= SEC_ALLOC;
801 if (hdr->p_flags & PF_X)
802 newsect->flags |= SEC_CODE;
804 if (!(hdr->p_flags & PF_W))
805 newsect->flags |= SEC_READONLY;
811 /* Begin processing a given object.
813 First we validate the file by reading in the ELF header and checking
816 static INLINE boolean
818 Elf_External_Ehdr *x_ehdrp;
820 return ((x_ehdrp->e_ident[EI_MAG0] == ELFMAG0)
821 && (x_ehdrp->e_ident[EI_MAG1] == ELFMAG1)
822 && (x_ehdrp->e_ident[EI_MAG2] == ELFMAG2)
823 && (x_ehdrp->e_ident[EI_MAG3] == ELFMAG3));
826 /* Check to see if the file associated with ABFD matches the target vector
829 Note that we may be called several times with the same ABFD, but different
830 target vectors, most of which will not match. We have to avoid leaving
831 any side effects in ABFD, or any data it points to (like tdata), if the
832 file does not match the target vector.
834 FIXME: There is memory leak if we are called more than once with the same
835 ABFD, and that bfd already has tdata allocated, since we allocate more tdata
836 and the old tdata is orphaned. Since it's in the bfd obstack, there isn't
837 much we can do about this except possibly rewrite the code. There are
838 also other bfd_allocs that may be the source of memory leaks as well. */
844 Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
845 Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
846 Elf_External_Shdr x_shdr; /* Section header table entry, external form */
847 Elf_Internal_Shdr *i_shdrp; /* Section header table, internal form */
848 unsigned int shindex;
849 char *shstrtab; /* Internal copy of section header stringtab */
850 struct elf_backend_data *ebd;
851 struct elf_obj_tdata *preserved_tdata = elf_tdata (abfd);
853 /* Read in the ELF header in external format. */
855 if (bfd_read ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr))
857 if (bfd_get_error () != bfd_error_system_call)
858 goto got_wrong_format_error;
863 /* Now check to see if we have a valid ELF file, and one that BFD can
864 make use of. The magic number must match, the address size ('class')
865 and byte-swapping must match our XVEC entry, and it must have a
866 section header table (FIXME: See comments re sections at top of this
869 if ((elf_file_p (&x_ehdr) == false) ||
870 (x_ehdr.e_ident[EI_VERSION] != EV_CURRENT) ||
871 (x_ehdr.e_ident[EI_CLASS] != ELFCLASS))
872 goto got_wrong_format_error;
874 /* Check that file's byte order matches xvec's */
875 switch (x_ehdr.e_ident[EI_DATA])
877 case ELFDATA2MSB: /* Big-endian */
878 if (!abfd->xvec->header_byteorder_big_p)
879 goto got_wrong_format_error;
881 case ELFDATA2LSB: /* Little-endian */
882 if (abfd->xvec->header_byteorder_big_p)
883 goto got_wrong_format_error;
885 case ELFDATANONE: /* No data encoding specified */
886 default: /* Unknown data encoding specified */
887 goto got_wrong_format_error;
890 /* Allocate an instance of the elf_obj_tdata structure and hook it up to
891 the tdata pointer in the bfd. FIXME: memory leak, see above. */
894 (struct elf_obj_tdata *) bfd_zalloc (abfd, sizeof (struct elf_obj_tdata));
895 if (elf_tdata (abfd) == NULL)
896 goto got_no_memory_error;
898 /* Now that we know the byte order, swap in the rest of the header */
899 i_ehdrp = elf_elfheader (abfd);
900 elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp);
902 elf_debug_file (i_ehdrp);
905 /* If there is no section header table, we're hosed. */
906 if (i_ehdrp->e_shoff == 0)
907 goto got_wrong_format_error;
909 /* As a simple sanity check, verify that the what BFD thinks is the
910 size of each section header table entry actually matches the size
911 recorded in the file. */
912 if (i_ehdrp->e_shentsize != sizeof (x_shdr))
913 goto got_wrong_format_error;
915 ebd = get_elf_backend_data (abfd);
917 /* Check that the ELF e_machine field matches what this particular
918 BFD format expects. */
919 if (ebd->elf_machine_code != i_ehdrp->e_machine)
921 bfd_target **target_ptr;
923 if (ebd->elf_machine_code != EM_NONE)
924 goto got_wrong_format_error;
926 /* This is the generic ELF target. Let it match any ELF target
927 for which we do not have a specific backend. */
928 for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++)
930 struct elf_backend_data *back;
932 if ((*target_ptr)->flavour != bfd_target_elf_flavour)
934 back = (struct elf_backend_data *) (*target_ptr)->backend_data;
935 if (back->elf_machine_code == i_ehdrp->e_machine)
937 /* target_ptr is an ELF backend which matches this
938 object file, so reject the generic ELF target. */
939 goto got_wrong_format_error;
945 /* Set the flags and architecture before calling the backend so that
946 it can override them. */
947 if (i_ehdrp->e_type == ET_EXEC)
948 abfd->flags |= EXEC_P;
949 else if (i_ehdrp->e_type == ET_DYN)
950 abfd->flags |= DYNAMIC;
952 bfd_default_set_arch_mach (abfd, ebd->arch, 0);
954 /* Remember the entry point specified in the ELF file header. */
955 bfd_get_start_address (abfd) = i_ehdrp->e_entry;
957 /* Let the backend double check the format and override global
959 if (ebd->elf_backend_object_p)
961 if ((*ebd->elf_backend_object_p) (abfd) == false)
962 goto got_wrong_format_error;
965 /* Allocate space for a copy of the section header table in
966 internal form, seek to the section header table in the file,
967 read it in, and convert it to internal form. */
968 i_shdrp = (Elf_Internal_Shdr *)
969 bfd_alloc (abfd, sizeof (*i_shdrp) * i_ehdrp->e_shnum);
970 elf_elfsections (abfd) =
971 (Elf_Internal_Shdr **) bfd_alloc (abfd, sizeof (i_shdrp) * i_ehdrp->e_shnum);
972 if (!i_shdrp || !elf_elfsections (abfd))
973 goto got_no_memory_error;
974 if (bfd_seek (abfd, i_ehdrp->e_shoff, SEEK_SET) == -1)
976 for (shindex = 0; shindex < i_ehdrp->e_shnum; shindex++)
978 if (bfd_read ((PTR) & x_shdr, sizeof x_shdr, 1, abfd) != sizeof (x_shdr))
980 elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex);
981 elf_elfsections (abfd)[shindex] = i_shdrp + shindex;
983 /* If this is a .dynamic section, mark the object file as being
984 dynamically linked. */
985 if (i_shdrp[shindex].sh_type == SHT_DYNAMIC)
986 abfd->flags |= DYNAMIC;
988 if (i_ehdrp->e_shstrndx)
990 bfd_section_from_shdr (abfd, i_ehdrp->e_shstrndx);
993 /* Read in the string table containing the names of the sections. We
994 will need the base pointer to this table later. */
995 /* We read this inline now, so that we don't have to go through
996 bfd_section_from_shdr with it (since this particular strtab is
997 used to find all of the ELF section names.) */
999 shstrtab = elf_get_str_section (abfd, i_ehdrp->e_shstrndx);
1001 goto got_wrong_format_error;
1003 /* Once all of the section headers have been read and converted, we
1004 can start processing them. Note that the first section header is
1005 a dummy placeholder entry, so we ignore it.
1007 We also watch for the symbol table section and remember the file
1008 offset and section size for both the symbol table section and the
1009 associated string table section. */
1011 for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++)
1013 bfd_section_from_shdr (abfd, shindex);
1016 return (abfd->xvec);
1018 /* If we are going to use goto's to avoid duplicating error setting
1019 and return(NULL) code, then this at least makes it more maintainable. */
1021 got_wrong_format_error:
1022 bfd_set_error (bfd_error_wrong_format);
1024 got_no_memory_error:
1025 bfd_set_error (bfd_error_no_memory);
1028 elf_tdata (abfd) = preserved_tdata;
1033 /* ELF .o/exec file writing */
1035 /* Takes a bfd and a symbol, returns a pointer to the elf specific area
1036 of the symbol if there is one. */
1037 static INLINE elf_symbol_type *
1038 elf_symbol_from (ignore_abfd, symbol)
1042 if (symbol->the_bfd->xvec->flavour != bfd_target_elf_flavour)
1045 if (symbol->the_bfd->tdata.elf_obj_data == (struct elf_obj_tdata *) NULL)
1048 return (elf_symbol_type *) symbol;
1051 /* Create ELF output from BFD sections.
1053 Essentially, just create the section header and forget about the program
1057 elf_make_sections (abfd, asect, obj)
1062 /* most of what is in bfd_shdr_from_section goes in here... */
1063 /* and all of these sections generate at *least* one ELF section. */
1064 Elf_Internal_Shdr *this_hdr;
1065 this_hdr = &elf_section_data (asect)->this_hdr;
1067 this_hdr->sh_addr = asect->vma;
1068 this_hdr->sh_size = asect->_raw_size;
1069 /* contents already set by elf_set_section_contents */
1071 if (asect->flags & SEC_RELOC)
1073 /* emit a reloc section, and thus strtab and symtab... */
1074 Elf_Internal_Shdr *rela_hdr;
1075 int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
1077 rela_hdr = &elf_section_data (asect)->rel_hdr;
1079 /* orelocation has the data, reloc_count has the count... */
1082 rela_hdr->sh_type = SHT_RELA;
1083 rela_hdr->sh_entsize = sizeof (Elf_External_Rela);
1086 /* REL relocations */
1088 rela_hdr->sh_type = SHT_REL;
1089 rela_hdr->sh_entsize = sizeof (Elf_External_Rel);
1091 rela_hdr->sh_flags = 0;
1092 rela_hdr->sh_addr = 0;
1093 rela_hdr->sh_offset = 0;
1095 /* FIXME: Systems I've checked use an alignment of 4, but it is
1096 possible that some systems use a different alignment. */
1097 rela_hdr->sh_addralign = 4;
1101 if (asect->flags & SEC_ALLOC)
1103 this_hdr->sh_flags |= SHF_ALLOC;
1104 if (asect->flags & SEC_LOAD)
1106 /* @@ Do something with sh_type? */
1111 /* If this section is not part of the program image during
1112 execution, leave the address fields at 0. */
1113 this_hdr->sh_addr = 0;
1116 if (!(asect->flags & SEC_READONLY))
1117 this_hdr->sh_flags |= SHF_WRITE;
1119 if (asect->flags & SEC_CODE)
1120 this_hdr->sh_flags |= SHF_EXECINSTR;
1124 write_relocs (abfd, sec, xxx)
1129 Elf_Internal_Shdr *rela_hdr;
1130 Elf_External_Rela *outbound_relocas;
1131 Elf_External_Rel *outbound_relocs;
1133 int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
1134 asymbol *last_sym = 0;
1135 int last_sym_idx = 9999999; /* should always be written before use */
1137 if ((sec->flags & SEC_RELOC) == 0)
1139 /* Flags are sometimes inconsistent. */
1140 if (sec->reloc_count == 0)
1143 rela_hdr = &elf_section_data (sec)->rel_hdr;
1145 rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count;
1146 rela_hdr->contents = (void *) bfd_alloc (abfd, rela_hdr->sh_size);
1147 if (!rela_hdr->contents)
1149 bfd_set_error (bfd_error_no_memory);
1150 abort (); /* FIXME */
1153 /* orelocation has the data, reloc_count has the count... */
1156 outbound_relocas = (Elf_External_Rela *) rela_hdr->contents;
1158 for (idx = 0; idx < sec->reloc_count; idx++)
1160 Elf_Internal_Rela dst_rela;
1161 Elf_External_Rela *src_rela;
1166 ptr = sec->orelocation[idx];
1167 src_rela = outbound_relocas + idx;
1168 if (!(abfd->flags & EXEC_P))
1169 dst_rela.r_offset = ptr->address - sec->vma;
1171 dst_rela.r_offset = ptr->address;
1173 sym = *ptr->sym_ptr_ptr;
1174 if (sym == last_sym)
1179 last_sym_idx = n = elf_symbol_from_bfd_symbol (abfd, &sym);
1181 dst_rela.r_info = ELF_R_INFO (n, ptr->howto->type);
1183 dst_rela.r_addend = ptr->addend;
1184 elf_swap_reloca_out (abfd, &dst_rela, src_rela);
1188 /* REL relocations */
1190 outbound_relocs = (Elf_External_Rel *) rela_hdr->contents;
1192 for (idx = 0; idx < sec->reloc_count; idx++)
1194 Elf_Internal_Rel dst_rel;
1195 Elf_External_Rel *src_rel;
1200 ptr = sec->orelocation[idx];
1201 sym = *ptr->sym_ptr_ptr;
1202 src_rel = outbound_relocs + idx;
1203 if (!(abfd->flags & EXEC_P))
1204 dst_rel.r_offset = ptr->address - sec->vma;
1206 dst_rel.r_offset = ptr->address;
1208 if (sym == last_sym)
1213 last_sym_idx = n = elf_symbol_from_bfd_symbol (abfd, &sym);
1215 dst_rel.r_info = ELF_R_INFO (n, ptr->howto->type);
1217 elf_swap_reloc_out (abfd, &dst_rel, src_rel);
1223 fix_up_strtabs (abfd, asect, obj)
1228 Elf_Internal_Shdr *this_hdr = &elf_section_data (asect)->this_hdr;
1229 int this_idx = elf_section_data (asect)->this_idx;
1231 /* @@ Check flags! */
1232 if (!strncmp (asect->name, ".stab", 5)
1233 && !strcmp ("str", asect->name + strlen (asect->name) - 3))
1235 size_t len = strlen (asect->name) + 1;
1236 char *s = (char *) malloc (len);
1238 /* FIXME: Should deal more gracefully with errors. */
1240 strcpy (s, asect->name);
1242 asect = bfd_get_section_by_name (abfd, s);
1246 elf_section_data (asect)->this_hdr.sh_link = this_idx;
1247 /* @@ Assuming 32 bits! */
1248 elf_section_data (asect)->this_hdr.sh_entsize = 0xc;
1250 this_hdr->sh_type = SHT_STRTAB;
1255 elf_fake_sections (abfd, asect, obj)
1260 /* most of what is in bfd_shdr_from_section goes in here... */
1261 /* and all of these sections generate at *least* one ELF section. */
1263 Elf_Internal_Shdr *this_hdr;
1264 this_hdr = &elf_section_data (asect)->this_hdr;
1266 bfd_add_to_strtab (abfd, elf_shstrtab (abfd), asect->name);
1267 /* We need to log the type *now* so that elf_section_from_bfd_section
1268 can find us... have to set rawdata too. */
1269 this_hdr->rawdata = (void *) asect;
1270 this_hdr->sh_addralign = 1 << asect->alignment_power;
1271 if ((asect->flags & SEC_ALLOC) && (asect->flags & SEC_LOAD))
1272 this_hdr->sh_type = SHT_PROGBITS;
1273 else if ((asect->flags & SEC_ALLOC) && ((asect->flags & SEC_LOAD) == 0))
1275 BFD_ASSERT (strcmp (asect->name, ".bss") == 0
1276 || strcmp (asect->name, ".sbss") == 0);
1277 this_hdr->sh_type = SHT_NOBITS;
1279 /* FIXME I am not sure how to detect a .note section from the flags
1280 word of an `asection'. */
1281 else if (!strcmp (asect->name, ".note"))
1282 this_hdr->sh_type = SHT_NOTE;
1284 this_hdr->sh_type = SHT_PROGBITS;
1286 this_hdr->sh_flags = 0;
1287 this_hdr->sh_addr = 0;
1288 this_hdr->sh_size = 0;
1289 this_hdr->sh_entsize = 0;
1290 this_hdr->sh_info = 0;
1291 this_hdr->sh_link = 0;
1292 this_hdr->sh_offset = 0;
1295 /* Now, check for processor-specific section types. */
1297 struct elf_backend_data *bed = get_elf_backend_data (abfd);
1299 if (bed->elf_backend_fake_sections)
1300 (*bed->elf_backend_fake_sections) (abfd, this_hdr, asect);
1304 /* Emit a strtab and symtab, and possibly a reloc section. */
1305 Elf_Internal_Shdr *rela_hdr;
1307 /* Note that only one symtab is used, so just remember it
1310 if (asect->flags & SEC_RELOC)
1312 int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
1314 rela_hdr = &elf_section_data (asect)->rel_hdr;
1316 bfd_add_2_to_strtab (abfd, elf_shstrtab (abfd),
1317 use_rela_p ? ".rela" : ".rel",
1319 rela_hdr->sh_type = use_rela_p ? SHT_RELA : SHT_REL;
1320 rela_hdr->sh_entsize = (use_rela_p
1321 ? sizeof (Elf_External_Rela)
1322 : sizeof (Elf_External_Rel));
1324 rela_hdr->sh_flags = 0;
1325 rela_hdr->sh_addr = 0;
1326 rela_hdr->sh_size = 0;
1327 rela_hdr->sh_offset = 0;
1329 /* FIXME: Systems I've checked use an alignment of 4, but some
1330 systems may use a different alignment. */
1331 rela_hdr->sh_addralign = 4;
1336 if (asect->flags & SEC_ALLOC)
1338 this_hdr->sh_flags |= SHF_ALLOC;
1339 if (asect->flags & SEC_LOAD)
1341 /* @@ Do something with sh_type? */
1344 if (!(asect->flags & SEC_READONLY))
1345 this_hdr->sh_flags |= SHF_WRITE;
1346 if (asect->flags & SEC_CODE)
1347 this_hdr->sh_flags |= SHF_EXECINSTR;
1350 /* Map symbol from it's internal number to the external number, moving
1351 all local symbols to be at the head of the list. */
1354 sym_is_global (abfd, sym)
1358 /* If the backend has a special mapping, use it. */
1359 if (get_elf_backend_data (abfd)->elf_backend_sym_is_global)
1360 return ((*get_elf_backend_data (abfd)->elf_backend_sym_is_global)
1363 if (sym->flags & (BSF_GLOBAL | BSF_WEAK))
1365 if (sym->flags & BSF_LOCAL)
1369 if (sym->section == 0)
1371 /* Is this valid? */
1376 if (sym->section == &bfd_und_section)
1378 if (bfd_is_com_section (sym->section))
1380 if (sym->flags & (BSF_LOCAL | BSF_SECTION_SYM | BSF_FILE))
1386 elf_map_symbols (abfd)
1389 int symcount = bfd_get_symcount (abfd);
1390 asymbol **syms = bfd_get_outsymbols (abfd);
1391 asymbol **sect_syms;
1393 int num_globals = 0;
1394 int num_locals2 = 0;
1395 int num_globals2 = 0;
1397 int num_sections = 0;
1398 Elf_Sym_Extra *sym_extra;
1403 fprintf (stderr, "elf_map_symbols\n");
1407 /* Add local symbols for each section for which there are relocs.
1408 FIXME: How can we tell which sections have relocs at this point?
1409 Will reloc_count always be accurate? Actually, I think most ELF
1410 targets create section symbols for all sections anyhow. */
1411 for (asect = abfd->sections; asect; asect = asect->next)
1413 if (max_index < asect->index)
1414 max_index = asect->index;
1418 elf_num_section_syms (abfd) = max_index;
1419 sect_syms = (asymbol **) bfd_zalloc (abfd, max_index * sizeof (asymbol *));
1420 elf_section_syms (abfd) = sect_syms;
1424 bfd_set_error (bfd_error_no_memory);
1428 for (asect = abfd->sections; asect; asect = asect->next)
1430 asymbol *sym = bfd_make_empty_symbol (abfd);
1433 bfd_set_error (bfd_error_no_memory);
1436 sym->the_bfd = abfd;
1437 sym->name = asect->name;
1438 sym->value = asect->vma;
1439 sym->flags = BSF_SECTION_SYM;
1440 sym->section = asect;
1441 sect_syms[asect->index] = sym;
1445 "creating section symbol, name = %s, value = 0x%.8lx, index = %d, section = 0x%.8lx\n",
1446 asect->name, (long) asect->vma, asect->index, (long) asect);
1453 syms = (asymbol **) bfd_realloc (abfd, syms,
1454 ((symcount + num_sections + 1)
1455 * sizeof (asymbol *)));
1457 syms = (asymbol **) bfd_alloc (abfd,
1458 (num_sections + 1) * sizeof (asymbol *));
1461 bfd_set_error (bfd_error_no_memory);
1465 for (asect = abfd->sections; asect; asect = asect->next)
1467 if (sect_syms[asect->index])
1468 syms[symcount++] = sect_syms[asect->index];
1471 syms[symcount] = (asymbol *) 0;
1472 bfd_set_symtab (abfd, syms, symcount);
1475 elf_sym_extra (abfd) = sym_extra
1476 = (Elf_Sym_Extra *) bfd_alloc (abfd, symcount * sizeof (Elf_Sym_Extra));
1479 bfd_set_error (bfd_error_no_memory);
1483 /* Identify and classify all of the symbols. */
1484 for (idx = 0; idx < symcount; idx++)
1486 if (!sym_is_global (abfd, syms[idx]))
1492 /* Now provide mapping information. Add +1 for skipping over the
1494 for (idx = 0; idx < symcount; idx++)
1496 syms[idx]->udata = (PTR) & sym_extra[idx];
1497 if (!sym_is_global (abfd, syms[idx]))
1498 sym_extra[idx].elf_sym_num = 1 + num_locals2++;
1500 sym_extra[idx].elf_sym_num = 1 + num_locals + num_globals2++;
1503 elf_num_locals (abfd) = num_locals;
1504 elf_num_globals (abfd) = num_globals;
1508 static boolean assign_section_numbers ();
1509 static boolean assign_file_positions_except_relocs ();
1512 elf_compute_section_file_positions (abfd)
1515 bfd_map_over_sections (abfd, elf_fake_sections, 0);
1517 if (!assign_section_numbers (abfd))
1520 bfd_map_over_sections (abfd, elf_make_sections, 0);
1522 bfd_map_over_sections (abfd, fix_up_strtabs, 0); /* .stab/.stabstr &c */
1524 if (swap_out_syms (abfd) == false)
1527 if (!assign_file_positions_except_relocs (abfd))
1534 elf_write_phdrs (abfd, i_ehdrp, i_phdrp, phdr_cnt)
1536 Elf_Internal_Ehdr *i_ehdrp;
1537 Elf_Internal_Phdr *i_phdrp;
1538 unsigned short phdr_cnt;
1540 /* first program header entry goes after the file header */
1541 int outbase = i_ehdrp->e_phoff;
1543 Elf_External_Phdr x_phdr;
1545 for (i = 0; i < phdr_cnt; i++)
1547 elf_swap_phdr_out (abfd, i_phdrp + i, &x_phdr);
1548 if (bfd_seek (abfd, outbase, SEEK_SET) != 0
1549 || (bfd_write ((PTR) & x_phdr, sizeof (x_phdr), 1, abfd)
1550 != sizeof (x_phdr)))
1552 outbase += sizeof (x_phdr);
1558 static const Elf_Internal_Shdr null_shdr;
1560 /* Assign all ELF section numbers. The dummy first section is handled here
1561 too. The link/info pointers for the standard section types are filled
1562 in here too, while we're at it. (Link pointers for .stab sections are
1563 not filled in here.) */
1565 assign_section_numbers (abfd)
1568 struct elf_obj_tdata *t = elf_tdata (abfd);
1570 int section_number = 1;
1572 Elf_Internal_Shdr **i_shdrp;
1574 t->shstrtab_hdr.sh_size = elf_shstrtab (abfd)->length;
1575 t->shstrtab_hdr.contents = (void *) elf_shstrtab (abfd)->tab;
1576 shstrtab_length_fixed = 1;
1578 t->shstrtab_section = section_number++;
1579 elf_elfheader (abfd)->e_shstrndx = t->shstrtab_section;
1582 t->symtab_section = section_number++;
1583 t->strtab_section = section_number++;
1584 t->symtab_hdr.sh_link = t->strtab_section;
1586 for (sec = abfd->sections; sec; sec = sec->next)
1588 struct bfd_elf_section_data *d = elf_section_data (sec);
1589 d->this_idx = section_number++;
1590 if (sec->flags & SEC_RELOC)
1592 d->rel_idx = section_number++;
1593 d->rel_hdr.sh_link = t->symtab_section;
1594 d->rel_hdr.sh_info = d->this_idx;
1598 /* No handling for per-section string tables currently. */
1600 elf_elfheader (abfd)->e_shnum = section_number;
1602 /* Set up the list of section header pointers, in agreement with the
1604 i_shdrp = (Elf_Internal_Shdr **)
1605 bfd_alloc (abfd, section_number * sizeof (Elf_Internal_Shdr *));
1608 bfd_set_error (bfd_error_no_memory);
1611 elf_elfsections (abfd) = i_shdrp;
1612 for (i = 0; i < section_number; i++)
1615 i_shdrp[0] = (Elf_Internal_Shdr *) & null_shdr;
1616 i_shdrp[t->shstrtab_section] = &t->shstrtab_hdr;
1619 i_shdrp[t->symtab_section] = &t->symtab_hdr;
1620 i_shdrp[t->strtab_section] = &t->strtab_hdr;
1622 for (sec = abfd->sections; sec; sec = sec->next)
1624 struct bfd_elf_section_data *d = elf_section_data (sec);
1625 i_shdrp[d->this_idx] = &d->this_hdr;
1627 i_shdrp[d->rel_idx] = &d->rel_hdr;
1629 /* Make sure we got everything.... */
1630 for (i = 0; i < section_number; i++)
1631 if (i_shdrp[i] == 0)
1636 static INLINE file_ptr
1637 assign_file_position_for_section (i_shdrp, offset)
1638 Elf_Internal_Shdr *i_shdrp;
1643 if (i_shdrp->sh_addralign != 0)
1644 align = i_shdrp->sh_addralign;
1647 i_shdrp->sh_offset = offset = BFD_ALIGN (offset, align);
1648 if (i_shdrp->rawdata != NULL)
1649 ((asection *) i_shdrp->rawdata)->filepos = offset;
1650 if (i_shdrp->sh_type != SHT_NOBITS)
1651 offset += i_shdrp->sh_size;
1655 static INLINE file_ptr
1656 align_file_position (off)
1659 return (off + FILE_ALIGN - 1) & ~(FILE_ALIGN - 1);
1662 static INLINE file_ptr
1663 assign_file_positions_for_symtab_and_strtabs (abfd, off)
1667 struct elf_obj_tdata *t = elf_tdata (abfd);
1669 off = align_file_position (off);
1670 off = assign_file_position_for_section (&t->symtab_hdr, off);
1671 off = assign_file_position_for_section (&t->shstrtab_hdr, off);
1672 off = assign_file_position_for_section (&t->strtab_hdr, off);
1678 bfd_vma low, mem_size;
1682 struct seg_info *next;
1686 map_program_segments (abfd)
1689 Elf_Internal_Shdr **i_shdrpp = elf_elfsections (abfd);
1690 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
1691 Elf_Internal_Shdr *i_shdrp;
1692 Elf_Internal_Phdr *phdr;
1694 unsigned int i, n_left = 0;
1695 file_ptr lowest_offset = 0;
1696 struct seg_info *seg = NULL;
1698 done = (char *) malloc (i_ehdrp->e_shnum);
1699 if (done == NULL && i_ehdrp->e_shnum != 0)
1701 bfd_set_error (bfd_error_no_memory);
1704 memset (done, 0, i_ehdrp->e_shnum);
1705 for (i = 1; i < i_ehdrp->e_shnum; i++)
1707 i_shdrp = i_shdrpp[i];
1708 /* If it's going to be mapped in, it's been assigned a position. */
1709 if (i_shdrp->sh_offset + 1 == 0)
1711 /* Well, not really, but we won't process it here. */
1715 if (i_shdrp->sh_offset < lowest_offset
1716 || lowest_offset == 0)
1717 lowest_offset = i_shdrp->sh_offset;
1718 /* Only interested in PROGBITS or NOBITS for generating segments. */
1719 switch (i_shdrp->sh_type)
1732 bfd_vma lowest_vma = -1, high;
1736 struct seg_info *snew;
1737 struct seg_info **s_ptr;
1739 for (i = 1; i < i_ehdrp->e_shnum; i++)
1741 i_shdrp = i_shdrpp[i];
1742 if (!done[i] && i_shdrp->sh_addr < lowest_vma)
1744 lowest_vma = i_shdrp->sh_addr;
1750 /* So now we know the lowest vma of any unassigned sections; start
1752 snew = (struct seg_info *) bfd_alloc (abfd, sizeof (struct seg_info));
1755 bfd_set_error (bfd_error_no_memory);
1759 while (*s_ptr != (struct seg_info *) NULL)
1760 s_ptr = &(*s_ptr)->next;
1763 snew->low = lowest_vma;
1764 i_shdrp = i_shdrpp[low_sec];
1765 snew->start_pos = i_shdrp->sh_offset;
1766 snew->sh_flags = i_shdrp->sh_flags;
1767 done[low_sec] = 1, n_left--;
1768 mem_size = i_shdrp->sh_size;
1769 high = lowest_vma + i_shdrp->sh_size;
1771 if (i_shdrp->sh_type == SHT_PROGBITS)
1772 file_size = i_shdrp->sh_size;
1774 for (i = 1; i < i_ehdrp->e_shnum; i++)
1780 i_shdrp = i_shdrpp[i];
1781 /* position of next byte on disk */
1782 f1 = snew->start_pos + file_size;
1783 if (i_shdrp->sh_type == SHT_PROGBITS)
1785 if (i_shdrp->sh_offset - f1 != i_shdrp->sh_addr - high)
1787 if (file_size != mem_size)
1791 /* sh_type == NOBITS */
1793 /* If the section in question has no contents in the disk
1794 file, we really don't care where it supposedly starts.
1795 But we don't want to bother merging it into this segment
1796 if it doesn't start on this memory page. */
1797 bfd_vma page1, page2;
1798 bfd_vma maxpagesize = get_elf_backend_data (abfd)->maxpagesize;
1800 /* page number in address space of current end of snew */
1801 page1 = (high - 1 + maxpagesize - 1) / maxpagesize;
1802 /* page number in address space of start of this section */
1803 page2 = (i_shdrp->sh_addr + maxpagesize - 1) / maxpagesize;
1808 done[i] = 1, n_left--;
1809 if (i_shdrp->sh_type == SHT_PROGBITS)
1810 file_size = i_shdrp->sh_offset + i_shdrp->sh_size - snew->start_pos;
1811 mem_size = i_shdrp->sh_addr + i_shdrp->sh_size - snew->low;
1812 high = i_shdrp->sh_addr + i_shdrp->sh_size;
1815 snew->file_size = file_size;
1816 snew->mem_size = mem_size;
1818 /* Now do something with the list of segments we've built up. */
1820 bfd_vma maxpagesize = get_elf_backend_data (abfd)->maxpagesize;
1825 for (s = seg; s; s = s->next)
1829 i_ehdrp->e_phentsize = sizeof (Elf_External_Phdr);
1830 sz = sizeof (Elf_External_Phdr) * n_segs;
1831 if (align_file_position (i_ehdrp->e_ehsize) + sz <= lowest_offset)
1832 i_ehdrp->e_phoff = align_file_position (i_ehdrp->e_ehsize);
1835 i_ehdrp->e_phoff = align_file_position (elf_tdata (abfd)->next_file_pos);
1836 elf_tdata (abfd)->next_file_pos = i_ehdrp->e_phoff + sz;
1838 phdr = (Elf_Internal_Phdr *) bfd_alloc (abfd,
1839 n_segs * sizeof (Elf_Internal_Phdr));
1842 bfd_set_error (bfd_error_no_memory);
1843 abort (); /* FIXME */
1845 elf_tdata (abfd)->phdr = phdr;
1848 phdr->p_type = PT_LOAD; /* only type we really support so far */
1849 phdr->p_offset = seg->start_pos;
1850 phdr->p_vaddr = seg->low;
1852 phdr->p_filesz = seg->file_size;
1853 phdr->p_memsz = seg->mem_size;
1854 phdr->p_flags = PF_R;
1855 phdr->p_align = maxpagesize; /* ? */
1856 if (seg->sh_flags & SHF_WRITE)
1857 /* SysVr4 ELF docs say "data segments normally have read, write,
1858 and execute permissions." */
1859 phdr->p_flags |= (PF_W | PF_X);
1860 if (seg->sh_flags & SHF_EXECINSTR)
1861 phdr->p_flags |= PF_X;
1865 i_ehdrp->e_phnum = n_segs;
1867 elf_write_phdrs (abfd, i_ehdrp, elf_tdata (abfd)->phdr, i_ehdrp->e_phnum);
1878 assign_file_positions_except_relocs (abfd)
1881 /* For now, we ignore the possibility of having program segments, which
1882 may require some alignment in the file. That'll require padding, and
1883 some interesting calculations to optimize file space usage.
1885 Also, since the application may change the list of relocations for
1886 a given section, we don't figure them in here. We'll put them at the
1887 end of the file, at positions computed during bfd_close.
1889 The order, for now: <ehdr> <shdr> <sec1> <sec2> <sec3> ... <rel1> ...
1890 or: <ehdr> <phdr> <sec1> <sec2> ... <shdr> <rel1> ... */
1892 struct elf_obj_tdata *t = elf_tdata (abfd);
1895 Elf_Internal_Shdr **i_shdrpp = elf_elfsections (abfd);
1896 Elf_Internal_Shdr *i_shdrp;
1897 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
1898 int exec_p = (abfd->flags & EXEC_P) != 0;
1899 bfd_vma maxpagesize = get_elf_backend_data (abfd)->maxpagesize;
1901 /* Everything starts after the ELF file header. */
1902 off = i_ehdrp->e_ehsize;
1906 /* Section headers. */
1907 off = align_file_position (off);
1908 i_ehdrp->e_shoff = off;
1909 off += i_ehdrp->e_shnum * i_ehdrp->e_shentsize;
1910 off = assign_file_positions_for_symtab_and_strtabs (abfd, off);
1912 for (i = 1; i < i_ehdrp->e_shnum; i++)
1914 /* The symtab and strtab sections are placed by
1915 assign_file_positions_for_symtab_and_strtabs. */
1916 if (i == t->symtab_section
1917 || i == t->strtab_section
1918 || i == t->shstrtab_section)
1921 i_shdrp = i_shdrpp[i];
1922 if (i_shdrp->sh_type == SHT_REL || i_shdrp->sh_type == SHT_RELA)
1924 i_shdrp->sh_offset = -1;
1929 if (maxpagesize == 0)
1930 maxpagesize = 1; /* make the arithmetic work */
1931 /* This isn't necessarily going to give the best packing, if the
1932 segments require padding between them, but since that isn't
1933 usually the case, this'll do. */
1934 if ((i_shdrp->sh_flags & SHF_ALLOC) == 0)
1936 i_shdrp->sh_offset = -1;
1939 /* Blindly assume that the segments are ordered optimally. With
1940 the default LD script, they will be. */
1941 if (i_shdrp->sh_type != SHT_NOBITS)
1943 /* need big unsigned type */
1945 addtl_off = i_shdrp->sh_addr - off;
1946 addtl_off = addtl_off % maxpagesize;
1953 off = assign_file_position_for_section (i_shdrp, off);
1956 && i_shdrp->sh_type == SHT_NOBITS
1957 && (i == i_ehdrp->e_shnum
1958 || i_shdrpp[i + 1]->sh_type != SHT_NOBITS))
1960 /* Skip to the next page to ensure that when the file is
1961 loaded the bss section is loaded with zeroes. I don't
1962 know if this is required on all platforms, but it
1963 shouldn't really hurt. */
1964 off = BFD_ALIGN (off, maxpagesize);
1968 && get_elf_backend_data (abfd)->maxpagesize > 1
1969 && i_shdrp->sh_type == SHT_PROGBITS
1970 && (i_shdrp->sh_flags & SHF_ALLOC)
1971 && (i_shdrp->sh_offset - i_shdrp->sh_addr) % get_elf_backend_data (abfd)->maxpagesize != 0)
1976 elf_tdata (abfd)->next_file_pos = off;
1977 if (!map_program_segments (abfd))
1979 off = elf_tdata (abfd)->next_file_pos;
1981 /* Section headers. */
1982 off = align_file_position (off);
1983 i_ehdrp->e_shoff = off;
1984 off += i_ehdrp->e_shnum * i_ehdrp->e_shentsize;
1986 off = assign_file_positions_for_symtab_and_strtabs (abfd, off);
1988 for (i = 1; i < i_ehdrp->e_shnum; i++)
1990 i_shdrp = i_shdrpp[i];
1991 if (i_shdrp->sh_offset + 1 == 0
1992 && i_shdrp->sh_type != SHT_REL
1993 && i_shdrp->sh_type != SHT_RELA)
1994 off = assign_file_position_for_section (i_shdrp, off);
1997 elf_tdata (abfd)->next_file_pos = off;
2005 Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
2006 Elf_Internal_Phdr *i_phdrp = 0; /* Program header table, internal form */
2007 Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */
2009 struct strtab *shstrtab;
2011 i_ehdrp = elf_elfheader (abfd);
2012 i_shdrp = elf_elfsections (abfd);
2014 shstrtab = bfd_new_strtab (abfd);
2018 elf_shstrtab (abfd) = shstrtab;
2020 i_ehdrp->e_ident[EI_MAG0] = ELFMAG0;
2021 i_ehdrp->e_ident[EI_MAG1] = ELFMAG1;
2022 i_ehdrp->e_ident[EI_MAG2] = ELFMAG2;
2023 i_ehdrp->e_ident[EI_MAG3] = ELFMAG3;
2025 i_ehdrp->e_ident[EI_CLASS] = ELFCLASS;
2026 i_ehdrp->e_ident[EI_DATA] =
2027 abfd->xvec->byteorder_big_p ? ELFDATA2MSB : ELFDATA2LSB;
2028 i_ehdrp->e_ident[EI_VERSION] = EV_CURRENT;
2030 for (count = EI_PAD; count < EI_NIDENT; count++)
2031 i_ehdrp->e_ident[count] = 0;
2033 i_ehdrp->e_type = (abfd->flags & EXEC_P) ? ET_EXEC : ET_REL;
2034 switch (bfd_get_arch (abfd))
2036 case bfd_arch_unknown:
2037 i_ehdrp->e_machine = EM_NONE;
2039 case bfd_arch_sparc:
2040 i_ehdrp->e_machine = EM_SPARC;
2041 /* start-sanitize-v9 */
2043 i_ehdrp->e_machine = EM_SPARC64;
2045 /* end-sanitize-v9 */
2048 i_ehdrp->e_machine = EM_386;
2051 i_ehdrp->e_machine = EM_68K;
2054 i_ehdrp->e_machine = EM_88K;
2057 i_ehdrp->e_machine = EM_860;
2059 case bfd_arch_mips: /* MIPS Rxxxx */
2060 i_ehdrp->e_machine = EM_MIPS; /* only MIPS R3000 */
2063 i_ehdrp->e_machine = EM_HPPA;
2065 case bfd_arch_powerpc:
2066 i_ehdrp->e_machine = EM_CYGNUS_POWERPC;
2068 /* also note that EM_M32, AT&T WE32100 is unknown to bfd */
2070 i_ehdrp->e_machine = EM_NONE;
2072 i_ehdrp->e_version = EV_CURRENT;
2073 i_ehdrp->e_ehsize = sizeof (Elf_External_Ehdr);
2075 /* no program header, for now. */
2076 i_ehdrp->e_phoff = 0;
2077 i_ehdrp->e_phentsize = 0;
2078 i_ehdrp->e_phnum = 0;
2080 /* each bfd section is section header entry */
2081 i_ehdrp->e_entry = bfd_get_start_address (abfd);
2082 i_ehdrp->e_shentsize = sizeof (Elf_External_Shdr);
2084 /* if we're building an executable, we'll need a program header table */
2085 if (abfd->flags & EXEC_P)
2087 /* it all happens later */
2089 i_ehdrp->e_phentsize = sizeof (Elf_External_Phdr);
2091 /* elf_build_phdrs() returns a (NULL-terminated) array of
2092 Elf_Internal_Phdrs */
2093 i_phdrp = elf_build_phdrs (abfd, i_ehdrp, i_shdrp, &i_ehdrp->e_phnum);
2094 i_ehdrp->e_phoff = outbase;
2095 outbase += i_ehdrp->e_phentsize * i_ehdrp->e_phnum;
2100 i_ehdrp->e_phentsize = 0;
2102 i_ehdrp->e_phoff = 0;
2105 elf_tdata (abfd)->symtab_hdr.sh_name = bfd_add_to_strtab (abfd, shstrtab,
2107 elf_tdata (abfd)->strtab_hdr.sh_name = bfd_add_to_strtab (abfd, shstrtab,
2109 elf_tdata (abfd)->shstrtab_hdr.sh_name = bfd_add_to_strtab (abfd, shstrtab,
2115 swap_out_syms (abfd)
2118 if (!elf_map_symbols (abfd))
2121 /* Dump out the symtabs. */
2123 int symcount = bfd_get_symcount (abfd);
2124 asymbol **syms = bfd_get_outsymbols (abfd);
2125 struct strtab *stt = bfd_new_strtab (abfd);
2126 Elf_Internal_Shdr *symtab_hdr;
2127 Elf_Internal_Shdr *symstrtab_hdr;
2128 Elf_External_Sym *outbound_syms;
2133 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2134 symtab_hdr->sh_type = SHT_SYMTAB;
2135 symtab_hdr->sh_entsize = sizeof (Elf_External_Sym);
2136 symtab_hdr->sh_size = symtab_hdr->sh_entsize * (symcount + 1);
2137 symtab_hdr->sh_info = elf_num_locals (abfd) + 1;
2139 /* FIXME: Systems I've checked use 4 byte alignment for .symtab,
2140 but it is possible that there are systems which use a different
2142 symtab_hdr->sh_addralign = 4;
2144 /* see assert in elf_fake_sections that supports this: */
2145 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
2146 symstrtab_hdr->sh_type = SHT_STRTAB;
2148 outbound_syms = (Elf_External_Sym *)
2149 bfd_alloc (abfd, (1 + symcount) * sizeof (Elf_External_Sym));
2152 bfd_set_error (bfd_error_no_memory);
2155 /* now generate the data (for "contents") */
2157 /* Fill in zeroth symbol and swap it out. */
2158 Elf_Internal_Sym sym;
2164 sym.st_shndx = SHN_UNDEF;
2165 elf_swap_symbol_out (abfd, &sym, outbound_syms);
2167 for (idx = 0; idx < symcount; idx++)
2169 Elf_Internal_Sym sym;
2170 bfd_vma value = syms[idx]->value;
2172 if (syms[idx]->flags & BSF_SECTION_SYM)
2173 /* Section symbols have no names. */
2176 sym.st_name = bfd_add_to_strtab (abfd, stt, syms[idx]->name);
2178 if (bfd_is_com_section (syms[idx]->section))
2180 /* ELF common symbols put the alignment into the `value' field,
2181 and the size into the `size' field. This is backwards from
2182 how BFD handles it, so reverse it here. */
2183 sym.st_size = value;
2184 /* Should retrieve this from somewhere... */
2186 sym.st_shndx = elf_section_from_bfd_section (abfd,
2187 syms[idx]->section);
2191 asection *sec = syms[idx]->section;
2192 elf_symbol_type *type_ptr;
2195 if (sec->output_section)
2197 value += sec->output_offset;
2198 sec = sec->output_section;
2201 sym.st_value = value;
2202 type_ptr = elf_symbol_from (abfd, syms[idx]);
2203 sym.st_size = type_ptr ? type_ptr->internal_elf_sym.st_size : 0;
2204 sym.st_shndx = shndx = elf_section_from_bfd_section (abfd, sec);
2208 /* Writing this would be a hell of a lot easier if we had
2209 some decent documentation on bfd, and knew what to expect
2210 of the library, and what to demand of applications. For
2211 example, it appears that `objcopy' might not set the
2212 section of a symbol to be a section that is actually in
2214 sec2 = bfd_get_section_by_name (abfd, sec->name);
2215 BFD_ASSERT (sec2 != 0);
2216 sym.st_shndx = shndx = elf_section_from_bfd_section (abfd, sec2);
2217 BFD_ASSERT (shndx != -1);
2221 if (bfd_is_com_section (syms[idx]->section))
2222 sym.st_info = ELF_ST_INFO (STB_GLOBAL, STT_OBJECT);
2223 else if (syms[idx]->section == &bfd_und_section)
2224 sym.st_info = ELF_ST_INFO (STB_GLOBAL, STT_NOTYPE);
2225 else if (syms[idx]->flags & BSF_SECTION_SYM)
2226 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
2227 else if (syms[idx]->flags & BSF_FILE)
2228 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
2231 int bind = STB_LOCAL;
2232 int type = STT_OBJECT;
2233 unsigned int flags = syms[idx]->flags;
2235 if (flags & BSF_LOCAL)
2237 else if (flags & BSF_WEAK)
2239 else if (flags & BSF_GLOBAL)
2242 if (flags & BSF_FUNCTION)
2245 sym.st_info = ELF_ST_INFO (bind, type);
2249 elf_swap_symbol_out (abfd, &sym,
2251 + elf_sym_extra (abfd)[idx].elf_sym_num));
2254 symtab_hdr->contents = (PTR) outbound_syms;
2255 symstrtab_hdr->contents = (PTR) stt->tab;
2256 symstrtab_hdr->sh_size = stt->length;
2257 symstrtab_hdr->sh_type = SHT_STRTAB;
2259 symstrtab_hdr->sh_flags = 0;
2260 symstrtab_hdr->sh_addr = 0;
2261 symstrtab_hdr->sh_entsize = 0;
2262 symstrtab_hdr->sh_link = 0;
2263 symstrtab_hdr->sh_info = 0;
2264 symstrtab_hdr->sh_addralign = 1;
2265 symstrtab_hdr->size = 0;
2268 /* put the strtab out too... */
2270 Elf_Internal_Shdr *this_hdr;
2272 this_hdr = &elf_tdata (abfd)->shstrtab_hdr;
2273 this_hdr->contents = (PTR) elf_shstrtab (abfd)->tab;
2274 this_hdr->sh_size = elf_shstrtab (abfd)->length;
2275 this_hdr->sh_type = SHT_STRTAB;
2276 this_hdr->sh_flags = 0;
2277 this_hdr->sh_addr = 0;
2278 this_hdr->sh_entsize = 0;
2279 this_hdr->sh_addralign = 1;
2286 write_shdrs_and_ehdr (abfd)
2289 Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
2290 Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
2291 Elf_External_Shdr *x_shdrp; /* Section header table, external form */
2292 Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */
2294 struct strtab *shstrtab;
2296 i_ehdrp = elf_elfheader (abfd);
2297 i_shdrp = elf_elfsections (abfd);
2298 shstrtab = elf_shstrtab (abfd);
2300 /* swap the header before spitting it out... */
2303 elf_debug_file (i_ehdrp);
2305 elf_swap_ehdr_out (abfd, i_ehdrp, &x_ehdr);
2306 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
2307 || (bfd_write ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd)
2308 != sizeof (x_ehdr)))
2311 /* at this point we've concocted all the ELF sections... */
2312 x_shdrp = (Elf_External_Shdr *)
2313 bfd_alloc (abfd, sizeof (*x_shdrp) * (i_ehdrp->e_shnum));
2316 bfd_set_error (bfd_error_no_memory);
2320 for (count = 0; count < i_ehdrp->e_shnum; count++)
2323 elf_debug_section (shstrtab->tab + i_shdrp[count]->sh_name, count,
2326 elf_swap_shdr_out (abfd, i_shdrp[count], x_shdrp + count);
2328 if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0
2329 || (bfd_write ((PTR) x_shdrp, sizeof (*x_shdrp), i_ehdrp->e_shnum, abfd)
2330 != sizeof (*x_shdrp) * i_ehdrp->e_shnum))
2333 /* need to dump the string table too... */
2339 assign_file_positions_for_relocs (abfd)
2342 file_ptr off = elf_tdata (abfd)->next_file_pos;
2344 Elf_Internal_Shdr **shdrpp = elf_elfsections (abfd);
2345 Elf_Internal_Shdr *shdrp;
2346 for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
2349 if (shdrp->sh_type != SHT_REL && shdrp->sh_type != SHT_RELA)
2351 off = align_file_position (off);
2352 off = assign_file_position_for_section (shdrp, off);
2354 elf_tdata (abfd)->next_file_pos = off;
2358 NAME(bfd_elf,write_object_contents) (abfd)
2361 struct elf_backend_data *bed = get_elf_backend_data (abfd);
2362 Elf_Internal_Ehdr *i_ehdrp;
2363 Elf_Internal_Shdr **i_shdrp;
2366 /* We don't know how to write dynamic objects. Specifically, we
2367 don't know how to construct the program header. */
2368 if ((abfd->flags & DYNAMIC) != 0)
2370 fprintf (stderr, "Writing ELF dynamic objects is not supported\n");
2371 bfd_set_error (bfd_error_wrong_format);
2375 if (abfd->output_has_begun == false)
2377 if (prep_headers (abfd) == false)
2379 if (elf_compute_section_file_positions (abfd) == false)
2381 abfd->output_has_begun = true;
2384 i_shdrp = elf_elfsections (abfd);
2385 i_ehdrp = elf_elfheader (abfd);
2387 bfd_map_over_sections (abfd, write_relocs, (PTR) 0);
2388 assign_file_positions_for_relocs (abfd);
2390 /* After writing the headers, we need to write the sections too... */
2391 for (count = 1; count < i_ehdrp->e_shnum; count++)
2393 if (bed->elf_backend_section_processing)
2394 (*bed->elf_backend_section_processing) (abfd, i_shdrp[count]);
2395 if (i_shdrp[count]->contents)
2397 if (bfd_seek (abfd, i_shdrp[count]->sh_offset, SEEK_SET) != 0
2398 || (bfd_write (i_shdrp[count]->contents, i_shdrp[count]->sh_size,
2400 != i_shdrp[count]->sh_size))
2405 if (bed->elf_backend_final_write_processing)
2406 (*bed->elf_backend_final_write_processing) (abfd);
2408 return write_shdrs_and_ehdr (abfd);
2411 /* Given an index of a section, retrieve a pointer to it. Note
2412 that for our purposes, sections are indexed by {1, 2, ...} with
2413 0 being an illegal index. */
2415 /* In the original, each ELF section went into exactly one BFD
2416 section. This doesn't really make sense, so we need a real mapping.
2417 The mapping has to hide in the Elf_Internal_Shdr since asection
2418 doesn't have anything like a tdata field... */
2421 section_from_elf_index (abfd, index)
2425 /* @@ Is bfd_com_section really correct in all the places it could
2426 be returned from this routine? */
2428 if (index == SHN_ABS)
2429 return &bfd_com_section; /* not abs? */
2430 if (index == SHN_COMMON)
2431 return &bfd_com_section;
2433 if (index > elf_elfheader (abfd)->e_shnum)
2437 Elf_Internal_Shdr *hdr = elf_elfsections (abfd)[index];
2439 switch (hdr->sh_type)
2441 /* ELF sections that map to BFD sections */
2445 bfd_section_from_shdr (abfd, index);
2446 return (struct sec *) hdr->rawdata;
2449 return (struct sec *) &bfd_abs_section;
2454 /* given a section, search the header to find them... */
2456 elf_section_from_bfd_section (abfd, asect)
2460 Elf_Internal_Shdr **i_shdrp = elf_elfsections (abfd);
2462 Elf_Internal_Shdr *hdr;
2463 int maxindex = elf_elfheader (abfd)->e_shnum;
2465 if (asect == &bfd_abs_section)
2467 if (asect == &bfd_com_section)
2469 if (asect == &bfd_und_section)
2472 for (index = 0; index < maxindex; index++)
2474 hdr = i_shdrp[index];
2475 switch (hdr->sh_type)
2477 /* ELF sections that map to BFD sections */
2483 if (((struct sec *) (hdr->rawdata)) == asect)
2489 /* fix_up_strtabs will generate STRTAB sections with names
2491 if (!strncmp (asect->name, ".stab", 5)
2492 && !strcmp ("str", asect->name + strlen (asect->name) - 3))
2496 if (((struct sec *) (hdr->rawdata)) == asect)
2504 struct elf_backend_data *bed = get_elf_backend_data (abfd);
2506 if (bed->elf_backend_section_from_bfd_section)
2511 if ((*bed->elf_backend_section_from_bfd_section)
2512 (abfd, hdr, asect, &retval))
2522 /* given a symbol, return the bfd index for that symbol. */
2524 elf_symbol_from_bfd_symbol (abfd, asym_ptr_ptr)
2526 struct symbol_cache_entry **asym_ptr_ptr;
2528 struct symbol_cache_entry *asym_ptr = *asym_ptr_ptr;
2530 flagword flags = asym_ptr->flags;
2532 /* When gas creates relocations against local labels, it creates its
2533 own symbol for the section, but does put the symbol into the
2534 symbol chain, so udata is 0. When the linker is generating
2535 relocatable output, this section symbol may be for one of the
2536 input sections rather than the output section. */
2537 if (asym_ptr->udata == (PTR) 0
2538 && (flags & BSF_SECTION_SYM)
2539 && asym_ptr->section)
2543 if (asym_ptr->section->output_section != NULL)
2544 indx = asym_ptr->section->output_section->index;
2546 indx = asym_ptr->section->index;
2547 if (elf_section_syms (abfd)[indx])
2548 asym_ptr->udata = elf_section_syms (abfd)[indx]->udata;
2551 if (asym_ptr->udata)
2552 idx = ((Elf_Sym_Extra *) asym_ptr->udata)->elf_sym_num;
2562 "elf_symbol_from_bfd_symbol 0x%.8lx, name = %s, sym num = %d, flags = 0x%.8lx %s\n",
2563 (long) asym_ptr, asym_ptr->name, idx, flags, elf_symbol_flags (flags));
2572 elf_slurp_symbol_table (abfd, symptrs)
2574 asymbol **symptrs; /* Buffer for generated bfd symbols */
2576 Elf_Internal_Shdr *hdr = &elf_tdata (abfd)->symtab_hdr;
2577 long symcount; /* Number of external ELF symbols */
2578 elf_symbol_type *sym; /* Pointer to current bfd symbol */
2579 elf_symbol_type *symbase; /* Buffer for generated bfd symbols */
2580 Elf_Internal_Sym i_sym;
2581 Elf_External_Sym *x_symp = NULL;
2583 /* this is only valid because there is only one symtab... */
2584 /* FIXME: This is incorrect, there may also be a dynamic symbol
2585 table which is a subset of the full symbol table. We either need
2586 to be prepared to read both (and merge them) or ensure that we
2587 only read the full symbol table. Currently we only get called to
2588 read the full symbol table. -fnf */
2590 /* Read each raw ELF symbol, converting from external ELF form to
2591 internal ELF form, and then using the information to create a
2592 canonical bfd symbol table entry.
2594 Note that we allocate the initial bfd canonical symbol buffer
2595 based on a one-to-one mapping of the ELF symbols to canonical
2596 symbols. We actually use all the ELF symbols, so there will be no
2597 space left over at the end. When we have all the symbols, we
2598 build the caller's pointer vector. */
2600 if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) == -1)
2603 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
2606 sym = symbase = NULL;
2611 if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) == -1)
2614 symbase = ((elf_symbol_type *)
2615 bfd_zalloc (abfd, symcount * sizeof (elf_symbol_type)));
2616 if (symbase == (elf_symbol_type *) NULL)
2618 bfd_set_error (bfd_error_no_memory);
2623 /* Temporarily allocate room for the raw ELF symbols. */
2624 x_symp = ((Elf_External_Sym *)
2625 malloc (symcount * sizeof (Elf_External_Sym)));
2626 if (x_symp == NULL && symcount != 0)
2628 bfd_set_error (bfd_error_no_memory);
2632 if (bfd_read ((PTR) x_symp, sizeof (Elf_External_Sym), symcount, abfd)
2633 != symcount * sizeof (Elf_External_Sym))
2635 /* Skip first symbol, which is a null dummy. */
2636 for (i = 1; i < symcount; i++)
2638 elf_swap_symbol_in (abfd, x_symp + i, &i_sym);
2639 memcpy (&sym->internal_elf_sym, &i_sym, sizeof (Elf_Internal_Sym));
2640 #ifdef ELF_KEEP_EXTSYM
2641 memcpy (&sym->native_elf_sym, x_symp + i, sizeof (Elf_External_Sym));
2643 sym->symbol.the_bfd = abfd;
2645 sym->symbol.name = elf_string_from_elf_section (abfd, hdr->sh_link,
2648 sym->symbol.value = i_sym.st_value;
2650 if (i_sym.st_shndx > 0 && i_sym.st_shndx < SHN_LORESERV)
2652 sym->symbol.section = section_from_elf_index (abfd,
2655 else if (i_sym.st_shndx == SHN_ABS)
2657 sym->symbol.section = &bfd_abs_section;
2659 else if (i_sym.st_shndx == SHN_COMMON)
2661 sym->symbol.section = &bfd_com_section;
2662 /* Elf puts the alignment into the `value' field, and
2663 the size into the `size' field. BFD wants to see the
2664 size in the value field, and doesn't care (at the
2665 moment) about the alignment. */
2666 sym->symbol.value = i_sym.st_size;
2668 else if (i_sym.st_shndx == SHN_UNDEF)
2670 sym->symbol.section = &bfd_und_section;
2673 sym->symbol.section = &bfd_abs_section;
2675 sym->symbol.value -= sym->symbol.section->vma;
2677 switch (ELF_ST_BIND (i_sym.st_info))
2680 sym->symbol.flags |= BSF_LOCAL;
2683 sym->symbol.flags |= BSF_GLOBAL;
2686 sym->symbol.flags |= BSF_WEAK;
2690 switch (ELF_ST_TYPE (i_sym.st_info))
2693 sym->symbol.flags |= BSF_SECTION_SYM | BSF_DEBUGGING;
2696 sym->symbol.flags |= BSF_FILE | BSF_DEBUGGING;
2699 sym->symbol.flags |= BSF_FUNCTION;
2703 /* Do some backend-specific processing on this symbol. */
2705 struct elf_backend_data *ebd = get_elf_backend_data (abfd);
2706 if (ebd->elf_backend_symbol_processing)
2707 (*ebd->elf_backend_symbol_processing) (abfd, &sym->symbol);
2714 /* Do some backend-specific processing on this symbol table. */
2716 struct elf_backend_data *ebd = get_elf_backend_data (abfd);
2717 if (ebd->elf_backend_symbol_table_processing)
2718 (*ebd->elf_backend_symbol_table_processing) (abfd, symbase, symcount);
2721 /* We rely on the zalloc to clear out the final symbol entry. */
2723 bfd_get_symcount (abfd) = symcount = sym - symbase;
2725 /* Fill in the user's symbol pointer vector if needed. */
2729 while (symcount-- > 0)
2731 *symptrs++ = &sym->symbol;
2734 *symptrs = 0; /* Final null pointer */
2746 /* Return the number of bytes required to hold the symtab vector.
2748 Note that we base it on the count plus 1, since we will null terminate
2749 the vector allocated based on this size. However, the ELF symbol table
2750 always has a dummy entry as symbol #0, so it ends up even. */
2753 elf_get_symtab_upper_bound (abfd)
2758 Elf_Internal_Shdr *hdr = &elf_tdata (abfd)->symtab_hdr;
2760 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
2761 symtab_size = (symcount - 1 + 1) * (sizeof (asymbol *));
2767 This function return the number of bytes required to store the
2768 relocation information associated with section <<sect>>
2769 attached to bfd <<abfd>>
2773 elf_get_reloc_upper_bound (abfd, asect)
2777 if (asect->flags & SEC_RELOC)
2779 /* either rel or rela */
2780 return elf_section_data (asect)->rel_hdr.sh_size;
2787 elf_slurp_reloca_table (abfd, asect, symbols)
2792 Elf_External_Rela *native_relocs;
2793 arelent *reloc_cache;
2798 if (asect->relocation)
2800 if (asect->reloc_count == 0)
2802 if (asect->flags & SEC_CONSTRUCTOR)
2805 if (bfd_seek (abfd, asect->rel_filepos, SEEK_SET) != 0)
2807 native_relocs = (Elf_External_Rela *)
2808 bfd_alloc (abfd, asect->reloc_count * sizeof (Elf_External_Rela));
2811 bfd_set_error (bfd_error_no_memory);
2814 if (bfd_read ((PTR) native_relocs,
2815 sizeof (Elf_External_Rela), asect->reloc_count, abfd)
2816 != sizeof (Elf_External_Rela) * asect->reloc_count)
2819 reloc_cache = (arelent *)
2820 bfd_alloc (abfd, (size_t) (asect->reloc_count * sizeof (arelent)));
2824 bfd_set_error (bfd_error_no_memory);
2828 for (idx = 0; idx < asect->reloc_count; idx++)
2830 Elf_Internal_Rela dst;
2831 Elf_External_Rela *src;
2833 cache_ptr = reloc_cache + idx;
2834 src = native_relocs + idx;
2835 elf_swap_reloca_in (abfd, src, &dst);
2837 #ifdef RELOC_PROCESSING
2838 RELOC_PROCESSING (cache_ptr, &dst, symbols, abfd, asect);
2840 if (asect->flags & SEC_RELOC)
2842 /* relocatable, so the offset is off of the section */
2843 cache_ptr->address = dst.r_offset + asect->vma;
2847 /* non-relocatable, so the offset a virtual address */
2848 cache_ptr->address = dst.r_offset;
2851 /* ELF_R_SYM(dst.r_info) is the symbol table offset. An offset
2852 of zero points to the dummy symbol, which was not read into
2853 the symbol table SYMBOLS. */
2854 if (ELF_R_SYM (dst.r_info) == 0)
2855 cache_ptr->sym_ptr_ptr = bfd_abs_section.symbol_ptr_ptr;
2860 cache_ptr->sym_ptr_ptr = symbols + ELF_R_SYM (dst.r_info) - 1;
2862 /* Translate any ELF section symbol into a BFD section
2864 s = *(cache_ptr->sym_ptr_ptr);
2865 if (s->flags & BSF_SECTION_SYM)
2867 cache_ptr->sym_ptr_ptr = s->section->symbol_ptr_ptr;
2868 s = *cache_ptr->sym_ptr_ptr;
2869 if (s->name == 0 || s->name[0] == 0)
2873 cache_ptr->addend = dst.r_addend;
2875 /* Fill in the cache_ptr->howto field from dst.r_type */
2877 struct elf_backend_data *ebd = get_elf_backend_data (abfd);
2878 (*ebd->elf_info_to_howto) (abfd, cache_ptr, &dst);
2883 asect->relocation = reloc_cache;
2889 elf_debug_section (str, num, hdr)
2892 Elf_Internal_Shdr *hdr;
2894 fprintf (stderr, "\nSection#%d '%s' 0x%.8lx\n", num, str, (long) hdr);
2896 "sh_name = %ld\tsh_type = %ld\tsh_flags = %ld\n",
2897 (long) hdr->sh_name,
2898 (long) hdr->sh_type,
2899 (long) hdr->sh_flags);
2901 "sh_addr = %ld\tsh_offset = %ld\tsh_size = %ld\n",
2902 (long) hdr->sh_addr,
2903 (long) hdr->sh_offset,
2904 (long) hdr->sh_size);
2906 "sh_link = %ld\tsh_info = %ld\tsh_addralign = %ld\n",
2907 (long) hdr->sh_link,
2908 (long) hdr->sh_info,
2909 (long) hdr->sh_addralign);
2910 fprintf (stderr, "sh_entsize = %ld\n",
2911 (long) hdr->sh_entsize);
2912 fprintf (stderr, "rawdata = 0x%.8lx\n", (long) hdr->rawdata);
2913 fprintf (stderr, "contents = 0x%.8lx\n", (long) hdr->contents);
2914 fprintf (stderr, "size = %ld\n", (long) hdr->size);
2919 elf_debug_file (ehdrp)
2920 Elf_Internal_Ehdr *ehdrp;
2922 fprintf (stderr, "e_entry = 0x%.8lx\n", (long) ehdrp->e_entry);
2923 fprintf (stderr, "e_phoff = %ld\n", (long) ehdrp->e_phoff);
2924 fprintf (stderr, "e_phnum = %ld\n", (long) ehdrp->e_phnum);
2925 fprintf (stderr, "e_phentsize = %ld\n", (long) ehdrp->e_phentsize);
2926 fprintf (stderr, "e_shoff = %ld\n", (long) ehdrp->e_shoff);
2927 fprintf (stderr, "e_shnum = %ld\n", (long) ehdrp->e_shnum);
2928 fprintf (stderr, "e_shentsize = %ld\n", (long) ehdrp->e_shentsize);
2933 elf_slurp_reloc_table (abfd, asect, symbols)
2938 Elf_External_Rel *native_relocs;
2939 arelent *reloc_cache;
2941 Elf_Internal_Shdr *data_hdr;
2943 unsigned long data_max;
2944 char buf[4]; /* FIXME -- might be elf64 */
2948 if (asect->relocation)
2950 if (asect->reloc_count == 0)
2952 if (asect->flags & SEC_CONSTRUCTOR)
2955 if (bfd_seek (abfd, asect->rel_filepos, SEEK_SET) != 0)
2957 native_relocs = (Elf_External_Rel *)
2958 bfd_alloc (abfd, asect->reloc_count * sizeof (Elf_External_Rel));
2961 bfd_set_error (bfd_error_no_memory);
2964 if (bfd_read ((PTR) native_relocs,
2965 sizeof (Elf_External_Rel), asect->reloc_count, abfd)
2966 != sizeof (Elf_External_Rel) * asect->reloc_count)
2969 reloc_cache = (arelent *)
2970 bfd_alloc (abfd, (size_t) (asect->reloc_count * sizeof (arelent)));
2974 bfd_set_error (bfd_error_no_memory);
2978 /* Get the offset of the start of the segment we are relocating to read in
2979 the implicit addend. */
2980 data_hdr = &elf_section_data (asect)->this_hdr;
2981 data_off = data_hdr->sh_offset;
2982 data_max = data_hdr->sh_size - sizeof (buf) + 1;
2985 elf_debug_section ("data section", -1, data_hdr);
2988 for (idx = 0; idx < asect->reloc_count; idx++)
2990 #ifdef RELOC_PROCESSING
2991 Elf_Internal_Rel dst;
2992 Elf_External_Rel *src;
2994 cache_ptr = reloc_cache + idx;
2995 src = native_relocs + idx;
2996 elf_swap_reloc_in (abfd, src, &dst);
2998 RELOC_PROCESSING (cache_ptr, &dst, symbols, abfd, asect);
3000 Elf_Internal_Rel dst;
3001 Elf_External_Rel *src;
3003 cache_ptr = reloc_cache + idx;
3004 src = native_relocs + idx;
3006 elf_swap_reloc_in (abfd, src, &dst);
3008 if (asect->flags & SEC_RELOC)
3010 /* relocatable, so the offset is off of the section */
3011 cache_ptr->address = dst.r_offset + asect->vma;
3015 /* non-relocatable, so the offset a virtual address */
3016 cache_ptr->address = dst.r_offset;
3019 /* ELF_R_SYM(dst.r_info) is the symbol table offset. An offset
3020 of zero points to the dummy symbol, which was not read into
3021 the symbol table SYMBOLS. */
3022 if (ELF_R_SYM (dst.r_info) == 0)
3023 cache_ptr->sym_ptr_ptr = bfd_abs_section.symbol_ptr_ptr;
3028 cache_ptr->sym_ptr_ptr = symbols + ELF_R_SYM (dst.r_info) - 1;
3030 /* Translate any ELF section symbol into a BFD section
3032 s = *(cache_ptr->sym_ptr_ptr);
3033 if (s->flags & BSF_SECTION_SYM)
3035 cache_ptr->sym_ptr_ptr = s->section->symbol_ptr_ptr;
3036 s = *cache_ptr->sym_ptr_ptr;
3037 if (s->name == 0 || s->name[0] == 0)
3041 BFD_ASSERT (dst.r_offset <= data_max);
3042 cache_ptr->addend = 0;
3044 /* Fill in the cache_ptr->howto field from dst.r_type */
3046 struct elf_backend_data *ebd = get_elf_backend_data (abfd);
3047 (*ebd->elf_info_to_howto_rel) (abfd, cache_ptr, &dst);
3052 asect->relocation = reloc_cache;
3057 elf_canonicalize_reloc (abfd, section, relptr, symbols)
3063 arelent *tblptr = section->relocation;
3064 unsigned int count = 0;
3065 int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
3067 /* snarfed from coffcode.h */
3070 if (! elf_slurp_reloca_table (abfd, section, symbols))
3075 if (! elf_slurp_reloc_table (abfd, section, symbols))
3079 tblptr = section->relocation;
3081 for (; count++ < section->reloc_count;)
3082 *relptr++ = tblptr++;
3085 return section->reloc_count;
3089 elf_get_symtab (abfd, alocation)
3091 asymbol **alocation;
3093 if (!elf_slurp_symbol_table (abfd, alocation))
3096 return bfd_get_symcount (abfd);
3100 elf_make_empty_symbol (abfd)
3103 elf_symbol_type *newsym;
3105 newsym = (elf_symbol_type *) bfd_zalloc (abfd, sizeof (elf_symbol_type));
3108 bfd_set_error (bfd_error_no_memory);
3113 newsym->symbol.the_bfd = abfd;
3114 return &newsym->symbol;
3119 elf_get_symbol_info (ignore_abfd, symbol, ret)
3124 bfd_symbol_info (symbol, ret);
3128 elf_print_symbol (ignore_abfd, filep, symbol, how)
3132 bfd_print_symbol_type how;
3134 FILE *file = (FILE *) filep;
3137 case bfd_print_symbol_name:
3138 fprintf (file, "%s", symbol->name);
3140 case bfd_print_symbol_more:
3141 fprintf (file, "elf ");
3142 fprintf_vma (file, symbol->value);
3143 fprintf (file, " %lx", (long) symbol->flags);
3145 case bfd_print_symbol_all:
3147 CONST char *section_name;
3148 section_name = symbol->section ? symbol->section->name : "(*none*)";
3149 bfd_print_symbol_vandf ((PTR) file, symbol);
3150 fprintf (file, " %s\t%s",
3160 elf_get_lineno (ignore_abfd, symbol)
3164 fprintf (stderr, "elf_get_lineno unimplemented\n");
3171 elf_set_arch_mach (abfd, arch, machine)
3173 enum bfd_architecture arch;
3174 unsigned long machine;
3176 /* Allow any architecture to be supported by the elf backend */
3179 case bfd_arch_unknown: /* EM_NONE */
3180 case bfd_arch_sparc: /* EM_SPARC */
3181 case bfd_arch_i386: /* EM_386 */
3182 case bfd_arch_m68k: /* EM_68K */
3183 case bfd_arch_m88k: /* EM_88K */
3184 case bfd_arch_i860: /* EM_860 */
3185 case bfd_arch_mips: /* EM_MIPS (MIPS R3000) */
3186 case bfd_arch_hppa: /* EM_HPPA (HP PA_RISC) */
3187 case bfd_arch_powerpc: /* EM_CYGNUS_POWERPC */
3188 return bfd_default_set_arch_mach (abfd, arch, machine);
3195 elf_find_nearest_line (abfd,
3206 CONST char **filename_ptr;
3207 CONST char **functionname_ptr;
3208 unsigned int *line_ptr;
3214 elf_sizeof_headers (abfd, reloc)
3218 fprintf (stderr, "elf_sizeof_headers unimplemented\n");
3225 elf_set_section_contents (abfd, section, location, offset, count)
3230 bfd_size_type count;
3232 Elf_Internal_Shdr *hdr;
3234 if (abfd->output_has_begun == false) /* set by bfd.c handler? */
3236 /* do setup calculations (FIXME) */
3237 if (prep_headers (abfd) == false)
3239 if (elf_compute_section_file_positions (abfd) == false)
3241 abfd->output_has_begun = true;
3244 hdr = &elf_section_data (section)->this_hdr;
3246 if (bfd_seek (abfd, hdr->sh_offset + offset, SEEK_SET) == -1)
3248 if (bfd_write (location, 1, count, abfd) != count)
3255 elf_no_info_to_howto (abfd, cache_ptr, dst)
3258 Elf_Internal_Rela *dst;
3260 fprintf (stderr, "elf RELA relocation support for target machine unimplemented\n");
3266 elf_no_info_to_howto_rel (abfd, cache_ptr, dst)
3269 Elf_Internal_Rel *dst;
3271 fprintf (stderr, "elf REL relocation support for target machine unimplemented\n");
3277 /* Core file support */
3279 #ifdef HAVE_PROCFS /* Some core file support requires host /proc files */
3280 #include <sys/procfs.h>
3282 #define bfd_prstatus(abfd, descdata, descsz, filepos) /* Define away */
3283 #define bfd_fpregset(abfd, descdata, descsz, filepos) /* Define away */
3284 #define bfd_prpsinfo(abfd, descdata, descsz, filepos) /* Define away */
3290 bfd_prstatus (abfd, descdata, descsz, filepos)
3297 prstatus_t *status = (prstatus_t *) 0;
3299 if (descsz == sizeof (prstatus_t))
3301 newsect = bfd_make_section (abfd, ".reg");
3302 newsect->_raw_size = sizeof (status->pr_reg);
3303 newsect->filepos = filepos + (long) &status->pr_reg;
3304 newsect->flags = SEC_ALLOC | SEC_HAS_CONTENTS;
3305 newsect->alignment_power = 2;
3306 if ((core_prstatus (abfd) = bfd_alloc (abfd, descsz)) != NULL)
3308 memcpy (core_prstatus (abfd), descdata, descsz);
3313 /* Stash a copy of the prpsinfo structure away for future use. */
3316 bfd_prpsinfo (abfd, descdata, descsz, filepos)
3324 if (descsz == sizeof (prpsinfo_t))
3326 if ((core_prpsinfo (abfd) = bfd_alloc (abfd, descsz)) != NULL)
3328 memcpy (core_prpsinfo (abfd), descdata, descsz);
3334 bfd_fpregset (abfd, descdata, descsz, filepos)
3342 newsect = bfd_make_section (abfd, ".reg2");
3343 newsect->_raw_size = descsz;
3344 newsect->filepos = filepos;
3345 newsect->flags = SEC_ALLOC | SEC_HAS_CONTENTS;
3346 newsect->alignment_power = 2;
3349 #endif /* HAVE_PROCFS */
3351 /* Return a pointer to the args (including the command name) that were
3352 seen by the program that generated the core dump. Note that for
3353 some reason, a spurious space is tacked onto the end of the args
3354 in some (at least one anyway) implementations, so strip it off if
3358 elf_core_file_failing_command (abfd)
3362 if (core_prpsinfo (abfd))
3364 prpsinfo_t *p = core_prpsinfo (abfd);
3365 char *scan = p->pr_psargs;
3370 if ((scan > p->pr_psargs) && (*scan == ' '))
3374 return p->pr_psargs;
3380 /* Return the number of the signal that caused the core dump. Presumably,
3381 since we have a core file, we got a signal of some kind, so don't bother
3382 checking the other process status fields, just return the signal number.
3386 elf_core_file_failing_signal (abfd)
3390 if (core_prstatus (abfd))
3392 return ((prstatus_t *) (core_prstatus (abfd)))->pr_cursig;
3398 /* Check to see if the core file could reasonably be expected to have
3399 come for the current executable file. Note that by default we return
3400 true unless we find something that indicates that there might be a
3405 elf_core_file_matches_executable_p (core_bfd, exec_bfd)
3414 /* First, xvecs must match since both are ELF files for the same target. */
3416 if (core_bfd->xvec != exec_bfd->xvec)
3418 bfd_set_error (bfd_error_system_call);
3424 /* If no prpsinfo, just return true. Otherwise, grab the last component
3425 of the exec'd pathname from the prpsinfo. */
3427 if (core_prpsinfo (core_bfd))
3429 corename = (((struct prpsinfo *) core_prpsinfo (core_bfd))->pr_fname);
3436 /* Find the last component of the executable pathname. */
3438 if ((execname = strrchr (exec_bfd->filename, '/')) != NULL)
3444 execname = (char *) exec_bfd->filename;
3447 /* See if they match */
3449 return strcmp (execname, corename) ? false : true;
3455 #endif /* HAVE_PROCFS */
3458 /* ELF core files contain a segment of type PT_NOTE, that holds much of
3459 the information that would normally be available from the /proc interface
3460 for the process, at the time the process dumped core. Currently this
3461 includes copies of the prstatus, prpsinfo, and fpregset structures.
3463 Since these structures are potentially machine dependent in size and
3464 ordering, bfd provides two levels of support for them. The first level,
3465 available on all machines since it does not require that the host
3466 have /proc support or the relevant include files, is to create a bfd
3467 section for each of the prstatus, prpsinfo, and fpregset structures,
3468 without any interpretation of their contents. With just this support,
3469 the bfd client will have to interpret the structures itself. Even with
3470 /proc support, it might want these full structures for it's own reasons.
3472 In the second level of support, where HAVE_PROCFS is defined, bfd will
3473 pick apart the structures to gather some additional information that
3474 clients may want, such as the general register set, the name of the
3475 exec'ed file and its arguments, the signal (if any) that caused the
3481 elf_corefile_note (abfd, hdr)
3483 Elf_Internal_Phdr *hdr;
3485 Elf_External_Note *x_note_p; /* Elf note, external form */
3486 Elf_Internal_Note i_note; /* Elf note, internal form */
3487 char *buf = NULL; /* Entire note segment contents */
3488 char *namedata; /* Name portion of the note */
3489 char *descdata; /* Descriptor portion of the note */
3490 char *sectname; /* Name to use for new section */
3491 long filepos; /* File offset to descriptor data */
3494 if (hdr->p_filesz > 0
3495 && (buf = (char *) malloc (hdr->p_filesz)) != NULL
3496 && bfd_seek (abfd, hdr->p_offset, SEEK_SET) != -1
3497 && bfd_read ((PTR) buf, hdr->p_filesz, 1, abfd) == hdr->p_filesz)
3499 x_note_p = (Elf_External_Note *) buf;
3500 while ((char *) x_note_p < (buf + hdr->p_filesz))
3502 i_note.namesz = bfd_h_get_32 (abfd, (bfd_byte *) x_note_p->namesz);
3503 i_note.descsz = bfd_h_get_32 (abfd, (bfd_byte *) x_note_p->descsz);
3504 i_note.type = bfd_h_get_32 (abfd, (bfd_byte *) x_note_p->type);
3505 namedata = x_note_p->name;
3506 descdata = namedata + BFD_ALIGN (i_note.namesz, 4);
3507 filepos = hdr->p_offset + (descdata - buf);
3508 switch (i_note.type)
3511 /* process descdata as prstatus info */
3512 bfd_prstatus (abfd, descdata, i_note.descsz, filepos);
3513 sectname = ".prstatus";
3516 /* process descdata as fpregset info */
3517 bfd_fpregset (abfd, descdata, i_note.descsz, filepos);
3518 sectname = ".fpregset";
3521 /* process descdata as prpsinfo */
3522 bfd_prpsinfo (abfd, descdata, i_note.descsz, filepos);
3523 sectname = ".prpsinfo";
3526 /* Unknown descriptor, just ignore it. */
3530 if (sectname != NULL)
3532 newsect = bfd_make_section (abfd, sectname);
3533 newsect->_raw_size = i_note.descsz;
3534 newsect->filepos = filepos;
3535 newsect->flags = SEC_ALLOC | SEC_HAS_CONTENTS;
3536 newsect->alignment_power = 2;
3538 x_note_p = (Elf_External_Note *)
3539 (descdata + BFD_ALIGN (i_note.descsz, 4));
3546 else if (hdr->p_filesz > 0)
3548 bfd_set_error (bfd_error_no_memory);
3555 /* Core files are simply standard ELF formatted files that partition
3556 the file using the execution view of the file (program header table)
3557 rather than the linking view. In fact, there is no section header
3558 table in a core file.
3560 The process status information (including the contents of the general
3561 register set) and the floating point register set are stored in a
3562 segment of type PT_NOTE. We handcraft a couple of extra bfd sections
3563 that allow standard bfd access to the general registers (.reg) and the
3564 floating point registers (.reg2).
3569 elf_core_file_p (abfd)
3572 Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
3573 Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
3574 Elf_External_Phdr x_phdr; /* Program header table entry, external form */
3575 Elf_Internal_Phdr *i_phdrp; /* Program header table, internal form */
3576 unsigned int phindex;
3577 struct elf_backend_data *ebd;
3579 /* Read in the ELF header in external format. */
3581 if (bfd_read ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr))
3583 if (bfd_get_error () != bfd_error_system_call)
3584 bfd_set_error (bfd_error_wrong_format);
3588 /* Now check to see if we have a valid ELF file, and one that BFD can
3589 make use of. The magic number must match, the address size ('class')
3590 and byte-swapping must match our XVEC entry, and it must have a
3591 program header table (FIXME: See comments re segments at top of this
3594 if (elf_file_p (&x_ehdr) == false)
3597 bfd_set_error (bfd_error_wrong_format);
3601 /* FIXME, Check EI_VERSION here ! */
3605 int desired_address_size = ELFCLASS32;
3608 int desired_address_size = ELFCLASS64;
3611 if (x_ehdr.e_ident[EI_CLASS] != desired_address_size)
3615 /* Switch xvec to match the specified byte order. */
3616 switch (x_ehdr.e_ident[EI_DATA])
3618 case ELFDATA2MSB: /* Big-endian */
3619 if (abfd->xvec->byteorder_big_p == false)
3622 case ELFDATA2LSB: /* Little-endian */
3623 if (abfd->xvec->byteorder_big_p == true)
3626 case ELFDATANONE: /* No data encoding specified */
3627 default: /* Unknown data encoding specified */
3631 /* Allocate an instance of the elf_obj_tdata structure and hook it up to
3632 the tdata pointer in the bfd. */
3635 (struct elf_obj_tdata *) bfd_zalloc (abfd, sizeof (struct elf_obj_tdata));
3636 if (elf_tdata (abfd) == NULL)
3638 bfd_set_error (bfd_error_no_memory);
3642 /* FIXME, `wrong' returns from this point onward, leak memory. */
3644 /* Now that we know the byte order, swap in the rest of the header */
3645 i_ehdrp = elf_elfheader (abfd);
3646 elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp);
3648 elf_debug_file (i_ehdrp);
3651 ebd = get_elf_backend_data (abfd);
3653 /* Check that the ELF e_machine field matches what this particular
3654 BFD format expects. */
3655 if (ebd->elf_machine_code != i_ehdrp->e_machine)
3657 bfd_target **target_ptr;
3659 if (ebd->elf_machine_code != EM_NONE)
3662 /* This is the generic ELF target. Let it match any ELF target
3663 for which we do not have a specific backend. */
3664 for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++)
3666 struct elf_backend_data *back;
3668 if ((*target_ptr)->flavour != bfd_target_elf_flavour)
3670 back = (struct elf_backend_data *) (*target_ptr)->backend_data;
3671 if (back->elf_machine_code == i_ehdrp->e_machine)
3673 /* target_ptr is an ELF backend which matches this
3674 object file, so reject the generic ELF target. */
3680 /* If there is no program header, or the type is not a core file, then
3682 if (i_ehdrp->e_phoff == 0 || i_ehdrp->e_type != ET_CORE)
3685 /* Allocate space for a copy of the program header table in
3686 internal form, seek to the program header table in the file,
3687 read it in, and convert it to internal form. As a simple sanity
3688 check, verify that the what BFD thinks is the size of each program
3689 header table entry actually matches the size recorded in the file. */
3691 if (i_ehdrp->e_phentsize != sizeof (x_phdr))
3693 i_phdrp = (Elf_Internal_Phdr *)
3694 bfd_alloc (abfd, sizeof (*i_phdrp) * i_ehdrp->e_phnum);
3697 bfd_set_error (bfd_error_no_memory);
3700 if (bfd_seek (abfd, i_ehdrp->e_phoff, SEEK_SET) == -1)
3702 for (phindex = 0; phindex < i_ehdrp->e_phnum; phindex++)
3704 if (bfd_read ((PTR) & x_phdr, sizeof (x_phdr), 1, abfd)
3707 elf_swap_phdr_in (abfd, &x_phdr, i_phdrp + phindex);
3710 /* Once all of the program headers have been read and converted, we
3711 can start processing them. */
3713 for (phindex = 0; phindex < i_ehdrp->e_phnum; phindex++)
3715 bfd_section_from_phdr (abfd, i_phdrp + phindex, phindex);
3716 if ((i_phdrp + phindex)->p_type == PT_NOTE)
3718 elf_corefile_note (abfd, i_phdrp + phindex);
3722 /* Remember the entry point specified in the ELF file header. */
3724 bfd_get_start_address (abfd) = i_ehdrp->e_entry;