diff options
Diffstat (limited to 'contrib/binutils/bfd/section.c')
-rw-r--r-- | contrib/binutils/bfd/section.c | 392 |
1 files changed, 267 insertions, 125 deletions
diff --git a/contrib/binutils/bfd/section.c b/contrib/binutils/bfd/section.c index fc03ce9..c1dc0b1 100644 --- a/contrib/binutils/bfd/section.c +++ b/contrib/binutils/bfd/section.c @@ -1,6 +1,6 @@ /* Object file "section" support for the BFD library. Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, - 2000, 2001 + 2000, 2001, 2002 Free Software Foundation, Inc. Written by Cygnus Support. @@ -177,7 +177,7 @@ CODE_FRAGMENT . . int id; . -. {* Which section is it; 0..nth. *} +. {* Which section in the bfd; 0..n-1 as sections are created in a bfd. *} . . int index; . @@ -205,9 +205,11 @@ CODE_FRAGMENT . some relocation information too. *} .#define SEC_RELOC 0x004 . -.#if 0 {* Obsolete ? *} -.#define SEC_BALIGN 0x008 -.#endif +. {* ELF reserves 4 processor specific bits and 8 operating system +. specific bits in sh_flags; at present we can get away with just +. one in communicating between the assembler and BFD, but this +. isn't a good long-term solution. *} +.#define SEC_ARCH_BIT_0 0x008 . . {* A signal to the OS that the section contains read only data. *} .#define SEC_READONLY 0x010 @@ -290,9 +292,10 @@ CODE_FRAGMENT . objects are to be further relocated. *} .#define SEC_EXCLUDE 0x40000 . -. {* The contents of this section are to be sorted by the -. based on the address specified in the associated symbol -. table. *} +. {* The contents of this section are to be sorted based on the sum of +. the symbol and addend values specified by the associated relocation +. entries. Entries without associated relocation entries will be +. appended to the end of the section in an unspecified order. *} .#define SEC_SORT_ENTRIES 0x80000 . . {* When linking, duplicate sections of the same name should be @@ -350,6 +353,18 @@ CODE_FRAGMENT . references found to any symbol in the section. *} .#define SEC_CLINK 0x10000000 . +. {* Attempt to merge identical entities in the section. +. Entity size is given in the entsize field. *} +.#define SEC_MERGE 0x20000000 +. +. {* If given with SEC_MERGE, entities to merge are zero terminated +. strings where entsize specifies character size instead of fixed +. size entries. *} +.#define SEC_STRINGS 0x40000000 +. +. {* This section contains data about section groups. *} +.#define SEC_GROUP 0x80000000 +. . {* End of section flags. *} . . {* Some internal packed boolean fields. *} @@ -364,13 +379,14 @@ CODE_FRAGMENT . unsigned int linker_mark : 1; . . {* Another mark flag used by some of the linker backends. Set for -. output sections that have a input section. *} +. output sections that have an input section. *} . unsigned int linker_has_input : 1; . . {* A mark flag used by some linker backends for garbage collection. *} . unsigned int gc_mark : 1; . -. {* Used by the ELF code to mark sections which have been allocated to segments. *} +. {* Used by the ELF code to mark sections which have been allocated +. to segments. *} . unsigned int segment_mark : 1; . . {* End of internal packed boolean fields. *} @@ -466,14 +482,14 @@ CODE_FRAGMENT . . unsigned int lineno_count; . +. {* Entity size for merging purposes. *} +. +. unsigned int entsize; +. . {* Optional information about a COMDAT entry; NULL if not COMDAT. *} . . struct bfd_comdat_info *comdat; . -. {* Points to the kept section if this section is a link-once section, -. and is discarded. *} -. struct sec *kept_section; -. . {* When a section is being output, this value changes as more . linenumbers are written out. *} . @@ -528,6 +544,12 @@ CODE_FRAGMENT .#define bfd_ind_section_ptr ((asection *) &bfd_ind_section) .#define bfd_is_ind_section(sec) ((sec) == bfd_ind_section_ptr) . +.#define bfd_is_const_section(SEC) \ +. ( ((SEC) == bfd_abs_section_ptr) \ +. || ((SEC) == bfd_und_section_ptr) \ +. || ((SEC) == bfd_com_section_ptr) \ +. || ((SEC) == bfd_ind_section_ptr)) +. .extern const struct symbol_cache_entry * const bfd_abs_symbol; .extern const struct symbol_cache_entry * const bfd_com_symbol; .extern const struct symbol_cache_entry * const bfd_und_symbol; @@ -538,6 +560,32 @@ CODE_FRAGMENT .#define bfd_get_section_size_after_reloc(section) \ . ((section)->reloc_done ? (section)->_cooked_size \ . : (abort (), (bfd_size_type) 1)) +. +.{* Macros to handle insertion and deletion of a bfd's sections. These +. only handle the list pointers, ie. do not adjust section_count, +. target_index etc. *} +.#define bfd_section_list_remove(ABFD, PS) \ +. do \ +. { \ +. asection **_ps = PS; \ +. asection *_s = *_ps; \ +. *_ps = _s->next; \ +. if (_s->next == NULL) \ +. (ABFD)->section_tail = _ps; \ +. } \ +. while (0) +.#define bfd_section_list_insert(ABFD, PS, S) \ +. do \ +. { \ +. asection **_ps = PS; \ +. asection *_s = S; \ +. _s->next = *_ps; \ +. *_ps = _s; \ +. if (_s->next == NULL) \ +. (ABFD)->section_tail = &_s->next; \ +. } \ +. while (0) +. */ /* We use a macro to initialize the static asymbol structures because @@ -584,11 +632,11 @@ static const asymbol global_syms[] = /* line_filepos, userdata, contents, lineno, lineno_count, */ \ 0, NULL, NULL, NULL, 0, \ \ - /* comdat, kept_section, moving_line_filepos, target_index, */ \ - NULL, NULL, 0, 0, \ + /* entsize, comdat, moving_line_filepos, */ \ + 0, NULL, 0, \ \ - /* used_by_bfd, constructor_chain, owner, */ \ - NULL, NULL, NULL, \ + /* target_index, used_by_bfd, constructor_chain, owner, */ \ + 0, NULL, NULL, NULL, \ \ /* symbol, */ \ (struct symbol_cache_entry *) &global_syms[IDX], \ @@ -607,6 +655,83 @@ STD_SECTION (bfd_abs_section, 0, bfd_abs_symbol, BFD_ABS_SECTION_NAME, 2); STD_SECTION (bfd_ind_section, 0, bfd_ind_symbol, BFD_IND_SECTION_NAME, 3); #undef STD_SECTION +struct section_hash_entry +{ + struct bfd_hash_entry root; + asection section; +}; + +/* Initialize an entry in the section hash table. */ + +struct bfd_hash_entry * +bfd_section_hash_newfunc (entry, table, string) + struct bfd_hash_entry *entry; + struct bfd_hash_table *table; + const char *string; +{ + /* Allocate the structure if it has not already been allocated by a + subclass. */ + if (entry == NULL) + { + entry = bfd_hash_allocate (table, sizeof (struct section_hash_entry)); + if (entry == NULL) + return entry; + } + + /* Call the allocation method of the superclass. */ + entry = bfd_hash_newfunc (entry, table, string); + if (entry != NULL) + { + memset ((PTR) &((struct section_hash_entry *) entry)->section, + 0, sizeof (asection)); + } + + return entry; +} + +#define section_hash_lookup(table, string, create, copy) \ + ((struct section_hash_entry *) \ + bfd_hash_lookup ((table), (string), (create), (copy))) + +/* Initializes a new section. NEWSECT->NAME is already set. */ + +static asection *bfd_section_init PARAMS ((bfd *, asection *)); + +static asection * +bfd_section_init (abfd, newsect) + bfd *abfd; + asection *newsect; +{ + static int section_id = 0x10; /* id 0 to 3 used by STD_SECTION. */ + + newsect->id = section_id; + newsect->index = abfd->section_count; + newsect->owner = abfd; + + /* Create a symbol whose only job is to point to this section. This + is useful for things like relocs which are relative to the base + of a section. */ + newsect->symbol = bfd_make_empty_symbol (abfd); + if (newsect->symbol == NULL) + return NULL; + + newsect->symbol->name = newsect->name; + newsect->symbol->value = 0; + newsect->symbol->section = newsect; + newsect->symbol->flags = BSF_SECTION_SYM; + + newsect->symbol_ptr_ptr = &newsect->symbol; + + if (! BFD_SEND (abfd, _new_section_hook, (abfd, newsect))) + return NULL; + + section_id++; + abfd->section_count++; + *abfd->section_tail = newsect; + abfd->section_tail = &newsect->next; + return newsect; +} + /* DOCDD INODE @@ -619,6 +744,29 @@ These are the functions exported by the section handling part of BFD. /* FUNCTION + bfd_section_list_clear + +SYNOPSIS + void bfd_section_list_clear (bfd *); + +DESCRIPTION + Clears the section list, and also resets the section count and + hash table entries. +*/ + +void +bfd_section_list_clear (abfd) + bfd *abfd; +{ + abfd->sections = NULL; + abfd->section_tail = &abfd->sections; + abfd->section_count = 0; + memset ((PTR) abfd->section_htab.table, 0, + abfd->section_htab.size * sizeof (struct bfd_hash_entry *)); +} + +/* +FUNCTION bfd_get_section_by_name SYNOPSIS @@ -640,11 +788,12 @@ bfd_get_section_by_name (abfd, name) bfd *abfd; const char *name; { - asection *sect; + struct section_hash_entry *sh; + + sh = section_hash_lookup (&abfd->section_htab, name, false, false); + if (sh != NULL) + return &sh->section; - for (sect = abfd->sections; sect != NULL; sect = sect->next) - if (!strcmp (sect->name, name)) - return sect; return NULL; } @@ -676,7 +825,7 @@ bfd_get_unique_section_name (abfd, templat, count) char *sname; len = strlen (templat); - sname = bfd_malloc (len + 8); + sname = bfd_malloc ((bfd_size_type) len + 8); if (sname == NULL) return NULL; strcpy (sname, templat); @@ -691,7 +840,7 @@ bfd_get_unique_section_name (abfd, templat, count) abort (); sprintf (sname + len, ".%d", num++); } - while (bfd_get_section_by_name (abfd, sname) != NULL); + while (section_hash_lookup (&abfd->section_htab, sname, false, false)); if (count != NULL) *count = num; @@ -728,12 +877,40 @@ bfd_make_section_old_way (abfd, name) bfd *abfd; const char *name; { - asection *sec = bfd_get_section_by_name (abfd, name); - if (sec == (asection *) NULL) + struct section_hash_entry *sh; + asection *newsect; + + if (abfd->output_has_begun) { - sec = bfd_make_section (abfd, name); + bfd_set_error (bfd_error_invalid_operation); + return NULL; } - return sec; + + if (strcmp (name, BFD_ABS_SECTION_NAME) == 0) + return bfd_abs_section_ptr; + + if (strcmp (name, BFD_COM_SECTION_NAME) == 0) + return bfd_com_section_ptr; + + if (strcmp (name, BFD_UND_SECTION_NAME) == 0) + return bfd_und_section_ptr; + + if (strcmp (name, BFD_IND_SECTION_NAME) == 0) + return bfd_ind_section_ptr; + + sh = section_hash_lookup (&abfd->section_htab, name, true, false); + if (sh == NULL) + return NULL; + + newsect = &sh->section; + if (newsect->name != NULL) + { + /* Section already exists. */ + return newsect; + } + + newsect->name = name; + return bfd_section_init (abfd, newsect); } /* @@ -758,10 +935,8 @@ bfd_make_section_anyway (abfd, name) bfd *abfd; const char *name; { - static int section_id = 0x10; /* id 0 to 3 used by STD_SECTION. */ + struct section_hash_entry *sh; asection *newsect; - asection **prev = &abfd->sections; - asection *sect = abfd->sections; if (abfd->output_has_begun) { @@ -769,55 +944,24 @@ bfd_make_section_anyway (abfd, name) return NULL; } - while (sect) - { - prev = §->next; - sect = sect->next; - } - - newsect = (asection *) bfd_zalloc (abfd, sizeof (asection)); - if (newsect == NULL) + sh = section_hash_lookup (&abfd->section_htab, name, true, false); + if (sh == NULL) return NULL; - newsect->name = name; - newsect->id = section_id++; - newsect->index = abfd->section_count++; - newsect->flags = SEC_NO_FLAGS; - - newsect->userdata = NULL; - newsect->contents = NULL; - newsect->next = (asection *) NULL; - newsect->relocation = (arelent *) NULL; - newsect->reloc_count = 0; - newsect->line_filepos = 0; - newsect->owner = abfd; - newsect->comdat = NULL; - newsect->kept_section = NULL; - - /* Create a symbol whos only job is to point to this section. This is - useful for things like relocs which are relative to the base of a - section. */ - newsect->symbol = bfd_make_empty_symbol (abfd); - if (newsect->symbol == NULL) + newsect = &sh->section; + if (newsect->name != NULL) { - bfd_release (abfd, newsect); - return NULL; - } - newsect->symbol->name = name; - newsect->symbol->value = 0; - newsect->symbol->section = newsect; - newsect->symbol->flags = BSF_SECTION_SYM; - - newsect->symbol_ptr_ptr = &newsect->symbol; - - if (BFD_SEND (abfd, _new_section_hook, (abfd, newsect)) != true) - { - bfd_release (abfd, newsect); - return NULL; + /* We are making a section of the same name. It can't go in + section_htab without generating a unique section name and + that would be pointless; We don't need to traverse the + hash table. */ + newsect = (asection *) bfd_zalloc (abfd, sizeof (asection)); + if (newsect == NULL) + return NULL; } - *prev = newsect; - return newsect; + newsect->name = name; + return bfd_section_init (abfd, newsect); } /* @@ -839,35 +983,34 @@ bfd_make_section (abfd, name) bfd *abfd; const char *name; { - asection *sect = abfd->sections; + struct section_hash_entry *sh; + asection *newsect; - if (strcmp (name, BFD_ABS_SECTION_NAME) == 0) - { - return bfd_abs_section_ptr; - } - if (strcmp (name, BFD_COM_SECTION_NAME) == 0) - { - return bfd_com_section_ptr; - } - if (strcmp (name, BFD_UND_SECTION_NAME) == 0) + if (abfd->output_has_begun) { - return bfd_und_section_ptr; + bfd_set_error (bfd_error_invalid_operation); + return NULL; } - if (strcmp (name, BFD_IND_SECTION_NAME) == 0) - { - return bfd_ind_section_ptr; - } + if (strcmp (name, BFD_ABS_SECTION_NAME) == 0 + || strcmp (name, BFD_COM_SECTION_NAME) == 0 + || strcmp (name, BFD_UND_SECTION_NAME) == 0 + || strcmp (name, BFD_IND_SECTION_NAME) == 0) + return NULL; + + sh = section_hash_lookup (&abfd->section_htab, name, true, false); + if (sh == NULL) + return NULL; - while (sect) + newsect = &sh->section; + if (newsect->name != NULL) { - if (!strcmp (sect->name, name)) - return NULL; - sect = sect->next; + /* Section already exists. */ + return newsect; } - /* The name is not already used; go ahead and make a new section. */ - return bfd_make_section_anyway (abfd, name); + newsect->name = name; + return bfd_section_init (abfd, newsect); } /* @@ -1000,12 +1143,9 @@ FUNCTION bfd_set_section_contents SYNOPSIS - boolean bfd_set_section_contents - (bfd *abfd, - asection *section, - PTR data, - file_ptr offset, - bfd_size_type count); + boolean bfd_set_section_contents (bfd *abfd, asection *section, + PTR data, file_ptr offset, + bfd_size_type count); DESCRIPTION Sets the contents of the section @var{section} in BFD @@ -1046,17 +1186,15 @@ bfd_set_section_contents (abfd, section, location, offset, count) return (false); } - if (offset < 0) + sz = bfd_get_section_size_now (abfd, section); + if ((bfd_size_type) offset > sz + || count > sz + || offset + count > sz + || count != (size_t) count) { - bad_val: bfd_set_error (bfd_error_bad_value); return false; } - sz = bfd_get_section_size_now (abfd, section); - if ((bfd_size_type) offset > sz - || count > sz - || offset + count > sz) - goto bad_val; switch (abfd->direction) { @@ -1079,7 +1217,7 @@ bfd_set_section_contents (abfd, section, location, offset, count) /* Record a copy of the data in memory if desired. */ if (section->contents && location != section->contents + offset) - memcpy (section->contents + offset, location, count); + memcpy (section->contents + offset, location, (size_t) count); if (BFD_SEND (abfd, _bfd_set_section_contents, (abfd, section, location, offset, count))) @@ -1096,9 +1234,9 @@ FUNCTION bfd_get_section_contents SYNOPSIS - boolean bfd_get_section_contents - (bfd *abfd, asection *section, PTR location, - file_ptr offset, bfd_size_type count); + boolean bfd_get_section_contents (bfd *abfd, asection *section, + PTR location, file_ptr offset, + bfd_size_type count); DESCRIPTION Read data from @var{section} in BFD @var{abfd} @@ -1125,21 +1263,21 @@ bfd_get_section_contents (abfd, section, location, offset, count) if (section->flags & SEC_CONSTRUCTOR) { - memset (location, 0, (unsigned) count); + memset (location, 0, (size_t) count); return true; } - if (offset < 0) + /* Even if reloc_done is true, this function reads unrelocated + contents, so we want the raw size. */ + sz = section->_raw_size; + if ((bfd_size_type) offset > sz + || count > sz + || offset + count > sz + || count != (size_t) count) { - bad_val: bfd_set_error (bfd_error_bad_value); return false; } - /* Even if reloc_done is true, this function reads unrelocated - contents, so we want the raw size. */ - sz = section->_raw_size; - if ((bfd_size_type) offset > sz || count > sz || offset + count > sz) - goto bad_val; if (count == 0) /* Don't bother. */ @@ -1147,7 +1285,7 @@ bfd_get_section_contents (abfd, section, location, offset, count) if ((section->flags & SEC_HAS_CONTENTS) == 0) { - memset (location, 0, (unsigned) count); + memset (location, 0, (size_t) count); return true; } @@ -1166,7 +1304,8 @@ FUNCTION bfd_copy_private_section_data SYNOPSIS - boolean bfd_copy_private_section_data(bfd *ibfd, asection *isec, bfd *obfd, asection *osec); + boolean bfd_copy_private_section_data (bfd *ibfd, asection *isec, + bfd *obfd, asection *osec); DESCRIPTION Copy private section information from @var{isec} in the BFD @@ -1239,7 +1378,8 @@ _bfd_strip_section_from_output (info, s) asection *is; for (is = abfd->sections; is != NULL; is = is->next) { - if (is != s && is->output_section == os) + if (is != s && is->output_section == os + && (is->flags & SEC_EXCLUDE) == 0) break; } if (is != NULL) @@ -1257,9 +1397,11 @@ _bfd_strip_section_from_output (info, s) for (spp = &os->owner->sections; *spp; spp = &(*spp)->next) if (*spp == os) { - *spp = os->next; + bfd_section_list_remove (os->owner, spp); os->owner->section_count--; break; } } + + s->flags |= SEC_EXCLUDE; } |