| /* ELF object file format |
| Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
| 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
| |
| This file is part of GAS, the GNU Assembler. |
| |
| GAS is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as |
| published by the Free Software Foundation; either version 2, |
| or (at your option) any later version. |
| |
| GAS is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| the GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GAS; see the file COPYING. If not, write to the Free |
| Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
| 02111-1307, USA. */ |
| |
| #define OBJ_HEADER "obj-elf.h" |
| #include "as.h" |
| #include "safe-ctype.h" |
| #include "subsegs.h" |
| #include "obstack.h" |
| #include "struc-symbol.h" |
| #include "dwarf2dbg.h" |
| |
| #ifndef ECOFF_DEBUGGING |
| #define ECOFF_DEBUGGING 0 |
| #else |
| #define NEED_ECOFF_DEBUG |
| #endif |
| |
| #ifdef NEED_ECOFF_DEBUG |
| #include "ecoff.h" |
| #endif |
| |
| #ifdef TC_ALPHA |
| #include "elf/alpha.h" |
| #endif |
| |
| #ifdef TC_MIPS |
| #include "elf/mips.h" |
| #endif |
| |
| #ifdef TC_PPC |
| #include "elf/ppc.h" |
| #endif |
| |
| #ifdef TC_I370 |
| #include "elf/i370.h" |
| #endif |
| |
| static void obj_elf_line (int); |
| static void obj_elf_size (int); |
| static void obj_elf_type (int); |
| static void obj_elf_ident (int); |
| static void obj_elf_weak (int); |
| static void obj_elf_local (int); |
| static void obj_elf_visibility (int); |
| static void obj_elf_symver (int); |
| static void obj_elf_subsection (int); |
| static void obj_elf_popsection (int); |
| static void obj_elf_tls_common (int); |
| static void obj_elf_lcomm (int); |
| |
| static const pseudo_typeS elf_pseudo_table[] = |
| { |
| {"comm", obj_elf_common, 0}, |
| {"common", obj_elf_common, 1}, |
| {"ident", obj_elf_ident, 0}, |
| {"lcomm", obj_elf_lcomm, 0}, |
| {"local", obj_elf_local, 0}, |
| {"previous", obj_elf_previous, 0}, |
| {"section", obj_elf_section, 0}, |
| {"section.s", obj_elf_section, 0}, |
| {"sect", obj_elf_section, 0}, |
| {"sect.s", obj_elf_section, 0}, |
| {"pushsection", obj_elf_section, 1}, |
| {"popsection", obj_elf_popsection, 0}, |
| {"size", obj_elf_size, 0}, |
| {"type", obj_elf_type, 0}, |
| {"version", obj_elf_version, 0}, |
| {"weak", obj_elf_weak, 0}, |
| |
| /* These define symbol visibility. */ |
| {"internal", obj_elf_visibility, STV_INTERNAL}, |
| {"hidden", obj_elf_visibility, STV_HIDDEN}, |
| {"protected", obj_elf_visibility, STV_PROTECTED}, |
| |
| /* These are used for stabs-in-elf configurations. */ |
| {"line", obj_elf_line, 0}, |
| |
| /* This is a GNU extension to handle symbol versions. */ |
| {"symver", obj_elf_symver, 0}, |
| |
| /* A GNU extension to change subsection only. */ |
| {"subsection", obj_elf_subsection, 0}, |
| |
| /* These are GNU extensions to aid in garbage collecting C++ vtables. */ |
| {"vtable_inherit", (void (*) (int)) &obj_elf_vtable_inherit, 0}, |
| {"vtable_entry", (void (*) (int)) &obj_elf_vtable_entry, 0}, |
| |
| /* These are used for dwarf. */ |
| {"2byte", cons, 2}, |
| {"4byte", cons, 4}, |
| {"8byte", cons, 8}, |
| /* These are used for dwarf2. */ |
| { "file", (void (*) (int)) dwarf2_directive_file, 0 }, |
| { "loc", dwarf2_directive_loc, 0 }, |
| |
| /* We need to trap the section changing calls to handle .previous. */ |
| {"data", obj_elf_data, 0}, |
| {"text", obj_elf_text, 0}, |
| |
| {"tls_common", obj_elf_tls_common, 0}, |
| |
| /* End sentinel. */ |
| {NULL, NULL, 0}, |
| }; |
| |
| static const pseudo_typeS ecoff_debug_pseudo_table[] = |
| { |
| #ifdef NEED_ECOFF_DEBUG |
| /* COFF style debugging information for ECOFF. .ln is not used; .loc |
| is used instead. */ |
| { "def", ecoff_directive_def, 0 }, |
| { "dim", ecoff_directive_dim, 0 }, |
| { "endef", ecoff_directive_endef, 0 }, |
| { "file", ecoff_directive_file, 0 }, |
| { "scl", ecoff_directive_scl, 0 }, |
| { "tag", ecoff_directive_tag, 0 }, |
| { "val", ecoff_directive_val, 0 }, |
| |
| /* COFF debugging requires pseudo-ops .size and .type, but ELF |
| already has meanings for those. We use .esize and .etype |
| instead. These are only generated by gcc anyhow. */ |
| { "esize", ecoff_directive_size, 0 }, |
| { "etype", ecoff_directive_type, 0 }, |
| |
| /* ECOFF specific debugging information. */ |
| { "begin", ecoff_directive_begin, 0 }, |
| { "bend", ecoff_directive_bend, 0 }, |
| { "end", ecoff_directive_end, 0 }, |
| { "ent", ecoff_directive_ent, 0 }, |
| { "fmask", ecoff_directive_fmask, 0 }, |
| { "frame", ecoff_directive_frame, 0 }, |
| { "loc", ecoff_directive_loc, 0 }, |
| { "mask", ecoff_directive_mask, 0 }, |
| |
| /* Other ECOFF directives. */ |
| { "extern", ecoff_directive_extern, 0 }, |
| |
| /* These are used on Irix. I don't know how to implement them. */ |
| { "alias", s_ignore, 0 }, |
| { "bgnb", s_ignore, 0 }, |
| { "endb", s_ignore, 0 }, |
| { "lab", s_ignore, 0 }, |
| { "noalias", s_ignore, 0 }, |
| { "verstamp", s_ignore, 0 }, |
| { "vreg", s_ignore, 0 }, |
| #endif |
| |
| {NULL, NULL, 0} /* end sentinel */ |
| }; |
| |
| #undef NO_RELOC |
| #include "aout/aout64.h" |
| |
| /* This is called when the assembler starts. */ |
| |
| void |
| elf_begin (void) |
| { |
| asection *s; |
| |
| /* Add symbols for the known sections to the symbol table. */ |
| s = bfd_get_section_by_name (stdoutput, TEXT_SECTION_NAME); |
| symbol_table_insert (section_symbol (s)); |
| s = bfd_get_section_by_name (stdoutput, DATA_SECTION_NAME); |
| symbol_table_insert (section_symbol (s)); |
| s = bfd_get_section_by_name (stdoutput, BSS_SECTION_NAME); |
| symbol_table_insert (section_symbol (s)); |
| } |
| |
| void |
| elf_pop_insert (void) |
| { |
| pop_insert (elf_pseudo_table); |
| if (ECOFF_DEBUGGING) |
| pop_insert (ecoff_debug_pseudo_table); |
| } |
| |
| static bfd_vma |
| elf_s_get_size (symbolS *sym) |
| { |
| return S_GET_SIZE (sym); |
| } |
| |
| static void |
| elf_s_set_size (symbolS *sym, bfd_vma sz) |
| { |
| S_SET_SIZE (sym, sz); |
| } |
| |
| static bfd_vma |
| elf_s_get_align (symbolS *sym) |
| { |
| return S_GET_ALIGN (sym); |
| } |
| |
| static void |
| elf_s_set_align (symbolS *sym, bfd_vma align) |
| { |
| S_SET_ALIGN (sym, align); |
| } |
| |
| int |
| elf_s_get_other (symbolS *sym) |
| { |
| return elf_symbol (symbol_get_bfdsym (sym))->internal_elf_sym.st_other; |
| } |
| |
| static void |
| elf_s_set_other (symbolS *sym, int other) |
| { |
| S_SET_OTHER (sym, other); |
| } |
| |
| static int |
| elf_sec_sym_ok_for_reloc (asection *sec) |
| { |
| return obj_sec_sym_ok_for_reloc (sec); |
| } |
| |
| void |
| elf_file_symbol (const char *s) |
| { |
| symbolS *sym; |
| |
| sym = symbol_new (s, absolute_section, 0, NULL); |
| symbol_set_frag (sym, &zero_address_frag); |
| symbol_get_bfdsym (sym)->flags |= BSF_FILE; |
| |
| if (symbol_rootP != sym) |
| { |
| symbol_remove (sym, &symbol_rootP, &symbol_lastP); |
| symbol_insert (sym, symbol_rootP, &symbol_rootP, &symbol_lastP); |
| #ifdef DEBUG |
| verify_symbol_chain (symbol_rootP, symbol_lastP); |
| #endif |
| } |
| |
| #ifdef NEED_ECOFF_DEBUG |
| ecoff_new_file (s); |
| #endif |
| } |
| |
| /* Called from read.c:s_comm after we've parsed .comm symbol, size. |
| Parse a possible alignment value. */ |
| |
| static symbolS * |
| elf_common_parse (int ignore ATTRIBUTE_UNUSED, symbolS *symbolP, addressT size) |
| { |
| addressT align = 0; |
| int is_local = symbol_get_obj (symbolP)->local; |
| |
| if (*input_line_pointer == ',') |
| { |
| char *save = input_line_pointer; |
| |
| input_line_pointer++; |
| SKIP_WHITESPACE (); |
| |
| if (*input_line_pointer == '"') |
| { |
| /* For sparc. Accept .common symbol, length, "bss" */ |
| input_line_pointer++; |
| /* Some use the dot, some don't. */ |
| if (*input_line_pointer == '.') |
| input_line_pointer++; |
| /* Some say data, some say bss. */ |
| if (strncmp (input_line_pointer, "bss\"", 4) == 0) |
| input_line_pointer += 4; |
| else if (strncmp (input_line_pointer, "data\"", 5) == 0) |
| input_line_pointer += 5; |
| else |
| { |
| char *p = input_line_pointer; |
| char c; |
| |
| while (*--p != '"') |
| ; |
| while (!is_end_of_line[(unsigned char) *input_line_pointer]) |
| if (*input_line_pointer++ == '"') |
| break; |
| c = *input_line_pointer; |
| *input_line_pointer = '\0'; |
| as_bad (_("bad .common segment %s"), p); |
| *input_line_pointer = c; |
| ignore_rest_of_line (); |
| return NULL; |
| } |
| /* ??? Don't ask me why these are always global. */ |
| is_local = 0; |
| } |
| else |
| { |
| input_line_pointer = save; |
| align = parse_align (is_local); |
| if (align == (addressT) -1) |
| return NULL; |
| } |
| } |
| |
| if (is_local) |
| { |
| bss_alloc (symbolP, size, align); |
| S_CLEAR_EXTERNAL (symbolP); |
| } |
| else |
| { |
| S_SET_VALUE (symbolP, size); |
| S_SET_ALIGN (symbolP, align); |
| S_SET_EXTERNAL (symbolP); |
| S_SET_SEGMENT (symbolP, bfd_com_section_ptr); |
| } |
| |
| symbol_get_bfdsym (symbolP)->flags |= BSF_OBJECT; |
| |
| return symbolP; |
| } |
| |
| void |
| obj_elf_common (int is_common) |
| { |
| if (flag_mri && is_common) |
| s_mri_common (0); |
| else |
| s_comm_internal (0, elf_common_parse); |
| } |
| |
| static void |
| obj_elf_tls_common (int ignore ATTRIBUTE_UNUSED) |
| { |
| symbolS *symbolP = s_comm_internal (0, elf_common_parse); |
| |
| if (symbolP) |
| symbol_get_bfdsym (symbolP)->flags |= BSF_THREAD_LOCAL; |
| } |
| |
| static void |
| obj_elf_lcomm (int ignore ATTRIBUTE_UNUSED) |
| { |
| symbolS *symbolP = s_comm_internal (0, s_lcomm_internal); |
| |
| if (symbolP) |
| symbol_get_bfdsym (symbolP)->flags |= BSF_OBJECT; |
| } |
| |
| static void |
| obj_elf_local (int ignore ATTRIBUTE_UNUSED) |
| { |
| char *name; |
| int c; |
| symbolS *symbolP; |
| |
| do |
| { |
| name = input_line_pointer; |
| c = get_symbol_end (); |
| symbolP = symbol_find_or_make (name); |
| *input_line_pointer = c; |
| SKIP_WHITESPACE (); |
| S_CLEAR_EXTERNAL (symbolP); |
| symbol_get_obj (symbolP)->local = 1; |
| if (c == ',') |
| { |
| input_line_pointer++; |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer == '\n') |
| c = '\n'; |
| } |
| } |
| while (c == ','); |
| demand_empty_rest_of_line (); |
| } |
| |
| static void |
| obj_elf_weak (int ignore ATTRIBUTE_UNUSED) |
| { |
| char *name; |
| int c; |
| symbolS *symbolP; |
| |
| do |
| { |
| name = input_line_pointer; |
| c = get_symbol_end (); |
| symbolP = symbol_find_or_make (name); |
| *input_line_pointer = c; |
| SKIP_WHITESPACE (); |
| S_SET_WEAK (symbolP); |
| symbol_get_obj (symbolP)->local = 1; |
| if (c == ',') |
| { |
| input_line_pointer++; |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer == '\n') |
| c = '\n'; |
| } |
| } |
| while (c == ','); |
| demand_empty_rest_of_line (); |
| } |
| |
| static void |
| obj_elf_visibility (int visibility) |
| { |
| char *name; |
| int c; |
| symbolS *symbolP; |
| asymbol *bfdsym; |
| elf_symbol_type *elfsym; |
| |
| do |
| { |
| name = input_line_pointer; |
| c = get_symbol_end (); |
| symbolP = symbol_find_or_make (name); |
| *input_line_pointer = c; |
| |
| SKIP_WHITESPACE (); |
| |
| bfdsym = symbol_get_bfdsym (symbolP); |
| elfsym = elf_symbol_from (bfd_asymbol_bfd (bfdsym), bfdsym); |
| |
| assert (elfsym); |
| |
| elfsym->internal_elf_sym.st_other &= ~3; |
| elfsym->internal_elf_sym.st_other |= visibility; |
| |
| if (c == ',') |
| { |
| input_line_pointer ++; |
| |
| SKIP_WHITESPACE (); |
| |
| if (*input_line_pointer == '\n') |
| c = '\n'; |
| } |
| } |
| while (c == ','); |
| |
| demand_empty_rest_of_line (); |
| } |
| |
| static segT previous_section; |
| static int previous_subsection; |
| |
| struct section_stack |
| { |
| struct section_stack *next; |
| segT seg, prev_seg; |
| int subseg, prev_subseg; |
| }; |
| |
| static struct section_stack *section_stack; |
| |
| static bfd_boolean |
| get_section (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf) |
| { |
| const char *gname = inf; |
| const char *group_name = elf_group_name (sec); |
| |
| return (group_name == gname |
| || (group_name != NULL |
| && gname != NULL |
| && strcmp (group_name, gname) == 0)); |
| } |
| |
| /* Handle the .section pseudo-op. This code supports two different |
| syntaxes. |
| |
| The first is found on Solaris, and looks like |
| .section ".sec1",#alloc,#execinstr,#write |
| Here the names after '#' are the SHF_* flags to turn on for the |
| section. I'm not sure how it determines the SHT_* type (BFD |
| doesn't really give us control over the type, anyhow). |
| |
| The second format is found on UnixWare, and probably most SVR4 |
| machines, and looks like |
| .section .sec1,"a",@progbits |
| The quoted string may contain any combination of a, w, x, and |
| represents the SHF_* flags to turn on for the section. The string |
| beginning with '@' can be progbits or nobits. There should be |
| other possibilities, but I don't know what they are. In any case, |
| BFD doesn't really let us set the section type. */ |
| |
| void |
| obj_elf_change_section (const char *name, |
| int type, |
| int attr, |
| int entsize, |
| const char *group_name, |
| int linkonce, |
| int push) |
| { |
| asection *old_sec; |
| segT sec; |
| flagword flags; |
| const struct bfd_elf_special_section *ssect; |
| |
| #ifdef md_flush_pending_output |
| md_flush_pending_output (); |
| #endif |
| |
| /* Switch to the section, creating it if necessary. */ |
| if (push) |
| { |
| struct section_stack *elt; |
| elt = xmalloc (sizeof (struct section_stack)); |
| elt->next = section_stack; |
| elt->seg = now_seg; |
| elt->prev_seg = previous_section; |
| elt->subseg = now_subseg; |
| elt->prev_subseg = previous_subsection; |
| section_stack = elt; |
| } |
| previous_section = now_seg; |
| previous_subsection = now_subseg; |
| |
| old_sec = bfd_get_section_by_name_if (stdoutput, name, get_section, |
| (void *) group_name); |
| if (old_sec) |
| { |
| sec = old_sec; |
| subseg_set (sec, 0); |
| } |
| else |
| sec = subseg_force_new (name, 0); |
| |
| ssect = _bfd_elf_get_sec_type_attr (stdoutput, name); |
| |
| if (ssect != NULL) |
| { |
| bfd_boolean override = FALSE; |
| |
| if (type == SHT_NULL) |
| type = ssect->type; |
| else if (type != ssect->type) |
| { |
| if (old_sec == NULL |
| /* FIXME: gcc, as of 2002-10-22, will emit |
| |
| .section .init_array,"aw",@progbits |
| |
| for __attribute__ ((section (".init_array"))). |
| "@progbits" is incorrect. */ |
| && ssect->type != SHT_INIT_ARRAY |
| && ssect->type != SHT_FINI_ARRAY |
| && ssect->type != SHT_PREINIT_ARRAY) |
| { |
| /* We allow to specify any type for a .note section. */ |
| if (ssect->type != SHT_NOTE) |
| as_warn (_("setting incorrect section type for %s"), |
| name); |
| } |
| else |
| { |
| as_warn (_("ignoring incorrect section type for %s"), |
| name); |
| type = ssect->type; |
| } |
| } |
| |
| if (old_sec == NULL && (attr & ~ssect->attr) != 0) |
| { |
| /* As a GNU extension, we permit a .note section to be |
| allocatable. If the linker sees an allocatable .note |
| section, it will create a PT_NOTE segment in the output |
| file. We also allow "x" for .note.GNU-stack. */ |
| if (ssect->type == SHT_NOTE |
| && (attr == SHF_ALLOC || attr == SHF_EXECINSTR)) |
| ; |
| /* Allow different SHF_MERGE and SHF_STRINGS if we have |
| something like .rodata.str. */ |
| else if (ssect->suffix_length == -2 |
| && name[ssect->prefix_length] == '.' |
| && (attr |
| & ~ssect->attr |
| & ~SHF_MERGE |
| & ~SHF_STRINGS) == 0) |
| ; |
| /* .interp, .strtab and .symtab can have SHF_ALLOC. */ |
| else if (attr == SHF_ALLOC |
| && (strcmp (name, ".interp") == 0 |
| || strcmp (name, ".strtab") == 0 |
| || strcmp (name, ".symtab") == 0)) |
| override = TRUE; |
| /* .note.GNU-stack can have SHF_EXECINSTR. */ |
| else if (attr == SHF_EXECINSTR |
| && strcmp (name, ".note.GNU-stack") == 0) |
| override = TRUE; |
| else |
| { |
| if (group_name == NULL) |
| as_warn (_("setting incorrect section attributes for %s"), |
| name); |
| override = TRUE; |
| } |
| } |
| if (!override && old_sec == NULL) |
| attr |= ssect->attr; |
| } |
| |
| if (type != SHT_NULL) |
| elf_section_type (sec) = type; |
| if (attr != 0) |
| elf_section_flags (sec) = attr; |
| |
| /* Convert ELF type and flags to BFD flags. */ |
| flags = (SEC_RELOC |
| | ((attr & SHF_WRITE) ? 0 : SEC_READONLY) |
| | ((attr & SHF_ALLOC) ? SEC_ALLOC : 0) |
| | (((attr & SHF_ALLOC) && type != SHT_NOBITS) ? SEC_LOAD : 0) |
| | ((attr & SHF_EXECINSTR) ? SEC_CODE : 0) |
| | ((attr & SHF_MERGE) ? SEC_MERGE : 0) |
| | ((attr & SHF_STRINGS) ? SEC_STRINGS : 0) |
| | ((attr & SHF_TLS) ? SEC_THREAD_LOCAL : 0)); |
| #ifdef md_elf_section_flags |
| flags = md_elf_section_flags (flags, attr, type); |
| #endif |
| |
| if (linkonce) |
| flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD; |
| |
| if (old_sec == NULL) |
| { |
| symbolS *secsym; |
| |
| /* Prevent SEC_HAS_CONTENTS from being inadvertently set. */ |
| if (type == SHT_NOBITS) |
| seg_info (sec)->bss = 1; |
| |
| bfd_set_section_flags (stdoutput, sec, flags); |
| if (flags & SEC_MERGE) |
| sec->entsize = entsize; |
| elf_group_name (sec) = group_name; |
| |
| /* Add a symbol for this section to the symbol table. */ |
| secsym = symbol_find (name); |
| if (secsym != NULL) |
| symbol_set_bfdsym (secsym, sec->symbol); |
| else |
| symbol_table_insert (section_symbol (sec)); |
| } |
| else if (attr != 0) |
| { |
| /* If section attributes are specified the second time we see a |
| particular section, then check that they are the same as we |
| saw the first time. */ |
| if (((old_sec->flags ^ flags) |
| & (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE |
| | SEC_EXCLUDE | SEC_SORT_ENTRIES | SEC_MERGE | SEC_STRINGS |
| | SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD |
| | SEC_THREAD_LOCAL))) |
| as_warn (_("ignoring changed section attributes for %s"), name); |
| if ((flags & SEC_MERGE) && old_sec->entsize != (unsigned) entsize) |
| as_warn (_("ignoring changed section entity size for %s"), name); |
| } |
| |
| #ifdef md_elf_section_change_hook |
| md_elf_section_change_hook (); |
| #endif |
| } |
| |
| static int |
| obj_elf_parse_section_letters (char *str, size_t len) |
| { |
| int attr = 0; |
| |
| while (len > 0) |
| { |
| switch (*str) |
| { |
| case 'a': |
| attr |= SHF_ALLOC; |
| break; |
| case 'w': |
| attr |= SHF_WRITE; |
| break; |
| case 'x': |
| attr |= SHF_EXECINSTR; |
| break; |
| case 'M': |
| attr |= SHF_MERGE; |
| break; |
| case 'S': |
| attr |= SHF_STRINGS; |
| break; |
| case 'G': |
| attr |= SHF_GROUP; |
| break; |
| case 'T': |
| attr |= SHF_TLS; |
| break; |
| /* Compatibility. */ |
| case 'm': |
| if (*(str - 1) == 'a') |
| { |
| attr |= SHF_MERGE; |
| if (len > 1 && str[1] == 's') |
| { |
| attr |= SHF_STRINGS; |
| str++, len--; |
| } |
| break; |
| } |
| default: |
| { |
| char *bad_msg = _("unrecognized .section attribute: want a,w,x,M,S,G,T"); |
| #ifdef md_elf_section_letter |
| int md_attr = md_elf_section_letter (*str, &bad_msg); |
| if (md_attr >= 0) |
| attr |= md_attr; |
| else |
| #endif |
| as_fatal ("%s", bad_msg); |
| } |
| break; |
| } |
| str++, len--; |
| } |
| |
| return attr; |
| } |
| |
| static int |
| obj_elf_section_word (char *str, size_t len) |
| { |
| if (len == 5 && strncmp (str, "write", 5) == 0) |
| return SHF_WRITE; |
| if (len == 5 && strncmp (str, "alloc", 5) == 0) |
| return SHF_ALLOC; |
| if (len == 9 && strncmp (str, "execinstr", 9) == 0) |
| return SHF_EXECINSTR; |
| if (len == 3 && strncmp (str, "tls", 3) == 0) |
| return SHF_TLS; |
| |
| #ifdef md_elf_section_word |
| { |
| int md_attr = md_elf_section_word (str, len); |
| if (md_attr >= 0) |
| return md_attr; |
| } |
| #endif |
| |
| as_warn (_("unrecognized section attribute")); |
| return 0; |
| } |
| |
| static int |
| obj_elf_section_type (char *str, size_t len) |
| { |
| if (len == 8 && strncmp (str, "progbits", 8) == 0) |
| return SHT_PROGBITS; |
| if (len == 6 && strncmp (str, "nobits", 6) == 0) |
| return SHT_NOBITS; |
| if (len == 4 && strncmp (str, "note", 4) == 0) |
| return SHT_NOTE; |
| if (len == 10 && strncmp (str, "init_array", 10) == 0) |
| return SHT_INIT_ARRAY; |
| if (len == 10 && strncmp (str, "fini_array", 10) == 0) |
| return SHT_FINI_ARRAY; |
| if (len == 13 && strncmp (str, "preinit_array", 13) == 0) |
| return SHT_PREINIT_ARRAY; |
| |
| #ifdef md_elf_section_type |
| { |
| int md_type = md_elf_section_type (str, len); |
| if (md_type >= 0) |
| return md_type; |
| } |
| #endif |
| |
| as_warn (_("unrecognized section type")); |
| return 0; |
| } |
| |
| /* Get name of section. */ |
| static char * |
| obj_elf_section_name (void) |
| { |
| char *name; |
| |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer == '"') |
| { |
| int dummy; |
| |
| name = demand_copy_C_string (&dummy); |
| if (name == NULL) |
| { |
| ignore_rest_of_line (); |
| return NULL; |
| } |
| } |
| else |
| { |
| char *end = input_line_pointer; |
| |
| while (0 == strchr ("\n\t,; ", *end)) |
| end++; |
| if (end == input_line_pointer) |
| { |
| as_bad (_("missing name")); |
| ignore_rest_of_line (); |
| return NULL; |
| } |
| |
| name = xmalloc (end - input_line_pointer + 1); |
| memcpy (name, input_line_pointer, end - input_line_pointer); |
| name[end - input_line_pointer] = '\0'; |
| #ifdef tc_canonicalize_section_name |
| name = tc_canonicalize_section_name (name); |
| #endif |
| input_line_pointer = end; |
| } |
| SKIP_WHITESPACE (); |
| return name; |
| } |
| |
| void |
| obj_elf_section (int push) |
| { |
| char *name, *group_name, *beg; |
| int type, attr, dummy; |
| int entsize; |
| int linkonce; |
| |
| #ifndef TC_I370 |
| if (flag_mri) |
| { |
| char mri_type; |
| |
| #ifdef md_flush_pending_output |
| md_flush_pending_output (); |
| #endif |
| |
| previous_section = now_seg; |
| previous_subsection = now_subseg; |
| |
| s_mri_sect (&mri_type); |
| |
| #ifdef md_elf_section_change_hook |
| md_elf_section_change_hook (); |
| #endif |
| |
| return; |
| } |
| #endif /* ! defined (TC_I370) */ |
| |
| name = obj_elf_section_name (); |
| if (name == NULL) |
| return; |
| type = SHT_NULL; |
| attr = 0; |
| group_name = NULL; |
| entsize = 0; |
| linkonce = 0; |
| |
| if (*input_line_pointer == ',') |
| { |
| /* Skip the comma. */ |
| ++input_line_pointer; |
| SKIP_WHITESPACE (); |
| |
| if (*input_line_pointer == '"') |
| { |
| beg = demand_copy_C_string (&dummy); |
| if (beg == NULL) |
| { |
| ignore_rest_of_line (); |
| return; |
| } |
| attr |= obj_elf_parse_section_letters (beg, strlen (beg)); |
| |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer == ',') |
| { |
| char c; |
| char *save = input_line_pointer; |
| |
| ++input_line_pointer; |
| SKIP_WHITESPACE (); |
| c = *input_line_pointer; |
| if (c == '"') |
| { |
| beg = demand_copy_C_string (&dummy); |
| if (beg == NULL) |
| { |
| ignore_rest_of_line (); |
| return; |
| } |
| type = obj_elf_section_type (beg, strlen (beg)); |
| } |
| else if (c == '@' || c == '%') |
| { |
| beg = ++input_line_pointer; |
| c = get_symbol_end (); |
| *input_line_pointer = c; |
| type = obj_elf_section_type (beg, input_line_pointer - beg); |
| } |
| else |
| input_line_pointer = save; |
| } |
| |
| SKIP_WHITESPACE (); |
| if ((attr & SHF_MERGE) != 0 && *input_line_pointer == ',') |
| { |
| ++input_line_pointer; |
| SKIP_WHITESPACE (); |
| entsize = get_absolute_expression (); |
| SKIP_WHITESPACE (); |
| if (entsize < 0) |
| { |
| as_warn (_("invalid merge entity size")); |
| attr &= ~SHF_MERGE; |
| entsize = 0; |
| } |
| } |
| else if ((attr & SHF_MERGE) != 0) |
| { |
| as_warn (_("entity size for SHF_MERGE not specified")); |
| attr &= ~SHF_MERGE; |
| } |
| |
| if ((attr & SHF_GROUP) != 0 && *input_line_pointer == ',') |
| { |
| ++input_line_pointer; |
| group_name = obj_elf_section_name (); |
| if (group_name == NULL) |
| attr &= ~SHF_GROUP; |
| else if (strncmp (input_line_pointer, ",comdat", 7) == 0) |
| { |
| input_line_pointer += 7; |
| linkonce = 1; |
| } |
| else if (strncmp (name, ".gnu.linkonce", 13) == 0) |
| linkonce = 1; |
| } |
| else if ((attr & SHF_GROUP) != 0) |
| { |
| as_warn (_("group name for SHF_GROUP not specified")); |
| attr &= ~SHF_GROUP; |
| } |
| } |
| else |
| { |
| do |
| { |
| char c; |
| |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer != '#') |
| { |
| as_bad (_("character following name is not '#'")); |
| ignore_rest_of_line (); |
| return; |
| } |
| beg = ++input_line_pointer; |
| c = get_symbol_end (); |
| *input_line_pointer = c; |
| |
| attr |= obj_elf_section_word (beg, input_line_pointer - beg); |
| |
| SKIP_WHITESPACE (); |
| } |
| while (*input_line_pointer++ == ','); |
| --input_line_pointer; |
| } |
| } |
| |
| demand_empty_rest_of_line (); |
| |
| obj_elf_change_section (name, type, attr, entsize, group_name, linkonce, push); |
| } |
| |
| /* Change to the .data section. */ |
| |
| void |
| obj_elf_data (int i) |
| { |
| #ifdef md_flush_pending_output |
| md_flush_pending_output (); |
| #endif |
| |
| previous_section = now_seg; |
| previous_subsection = now_subseg; |
| s_data (i); |
| |
| #ifdef md_elf_section_change_hook |
| md_elf_section_change_hook (); |
| #endif |
| } |
| |
| /* Change to the .text section. */ |
| |
| void |
| obj_elf_text (int i) |
| { |
| #ifdef md_flush_pending_output |
| md_flush_pending_output (); |
| #endif |
| |
| previous_section = now_seg; |
| previous_subsection = now_subseg; |
| s_text (i); |
| |
| #ifdef md_elf_section_change_hook |
| md_elf_section_change_hook (); |
| #endif |
| } |
| |
| static void |
| obj_elf_subsection (int ignore ATTRIBUTE_UNUSED) |
| { |
| register int temp; |
| |
| #ifdef md_flush_pending_output |
| md_flush_pending_output (); |
| #endif |
| |
| previous_section = now_seg; |
| previous_subsection = now_subseg; |
| |
| temp = get_absolute_expression (); |
| subseg_set (now_seg, (subsegT) temp); |
| demand_empty_rest_of_line (); |
| |
| #ifdef md_elf_section_change_hook |
| md_elf_section_change_hook (); |
| #endif |
| } |
| |
| /* This can be called from the processor backends if they change |
| sections. */ |
| |
| void |
| obj_elf_section_change_hook (void) |
| { |
| previous_section = now_seg; |
| previous_subsection = now_subseg; |
| } |
| |
| void |
| obj_elf_previous (int ignore ATTRIBUTE_UNUSED) |
| { |
| segT new_section; |
| int new_subsection; |
| |
| if (previous_section == 0) |
| { |
| as_warn (_(".previous without corresponding .section; ignored")); |
| return; |
| } |
| |
| #ifdef md_flush_pending_output |
| md_flush_pending_output (); |
| #endif |
| |
| new_section = previous_section; |
| new_subsection = previous_subsection; |
| previous_section = now_seg; |
| previous_subsection = now_subseg; |
| subseg_set (new_section, new_subsection); |
| |
| #ifdef md_elf_section_change_hook |
| md_elf_section_change_hook (); |
| #endif |
| } |
| |
| static void |
| obj_elf_popsection (int xxx ATTRIBUTE_UNUSED) |
| { |
| struct section_stack *top = section_stack; |
| |
| if (top == NULL) |
| { |
| as_warn (_(".popsection without corresponding .pushsection; ignored")); |
| return; |
| } |
| |
| #ifdef md_flush_pending_output |
| md_flush_pending_output (); |
| #endif |
| |
| section_stack = top->next; |
| previous_section = top->prev_seg; |
| previous_subsection = top->prev_subseg; |
| subseg_set (top->seg, top->subseg); |
| free (top); |
| |
| #ifdef md_elf_section_change_hook |
| md_elf_section_change_hook (); |
| #endif |
| } |
| |
| static void |
| obj_elf_line (int ignore ATTRIBUTE_UNUSED) |
| { |
| /* Assume delimiter is part of expression. BSD4.2 as fails with |
| delightful bug, so we are not being incompatible here. */ |
| new_logical_line (NULL, get_absolute_expression ()); |
| demand_empty_rest_of_line (); |
| } |
| |
| /* This handles the .symver pseudo-op, which is used to specify a |
| symbol version. The syntax is ``.symver NAME,SYMVERNAME''. |
| SYMVERNAME may contain ELF_VER_CHR ('@') characters. This |
| pseudo-op causes the assembler to emit a symbol named SYMVERNAME |
| with the same value as the symbol NAME. */ |
| |
| static void |
| obj_elf_symver (int ignore ATTRIBUTE_UNUSED) |
| { |
| char *name; |
| char c; |
| char old_lexat; |
| symbolS *sym; |
| |
| name = input_line_pointer; |
| c = get_symbol_end (); |
| |
| sym = symbol_find_or_make (name); |
| |
| *input_line_pointer = c; |
| |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer != ',') |
| { |
| as_bad (_("expected comma after name in .symver")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| ++input_line_pointer; |
| SKIP_WHITESPACE (); |
| name = input_line_pointer; |
| |
| /* Temporarily include '@' in symbol names. */ |
| old_lexat = lex_type[(unsigned char) '@']; |
| lex_type[(unsigned char) '@'] |= LEX_NAME; |
| c = get_symbol_end (); |
| lex_type[(unsigned char) '@'] = old_lexat; |
| |
| if (symbol_get_obj (sym)->versioned_name == NULL) |
| { |
| symbol_get_obj (sym)->versioned_name = xstrdup (name); |
| |
| *input_line_pointer = c; |
| |
| if (strchr (symbol_get_obj (sym)->versioned_name, |
| ELF_VER_CHR) == NULL) |
| { |
| as_bad (_("missing version name in `%s' for symbol `%s'"), |
| symbol_get_obj (sym)->versioned_name, |
| S_GET_NAME (sym)); |
| ignore_rest_of_line (); |
| return; |
| } |
| } |
| else |
| { |
| if (strcmp (symbol_get_obj (sym)->versioned_name, name)) |
| { |
| as_bad (_("multiple versions [`%s'|`%s'] for symbol `%s'"), |
| name, symbol_get_obj (sym)->versioned_name, |
| S_GET_NAME (sym)); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| *input_line_pointer = c; |
| } |
| |
| demand_empty_rest_of_line (); |
| } |
| |
| /* This handles the .vtable_inherit pseudo-op, which is used to indicate |
| to the linker the hierarchy in which a particular table resides. The |
| syntax is ".vtable_inherit CHILDNAME, PARENTNAME". */ |
| |
| struct fix * |
| obj_elf_vtable_inherit (int ignore ATTRIBUTE_UNUSED) |
| { |
| char *cname, *pname; |
| symbolS *csym, *psym; |
| char c, bad = 0; |
| |
| if (*input_line_pointer == '#') |
| ++input_line_pointer; |
| |
| cname = input_line_pointer; |
| c = get_symbol_end (); |
| csym = symbol_find (cname); |
| |
| /* GCFIXME: should check that we don't have two .vtable_inherits for |
| the same child symbol. Also, we can currently only do this if the |
| child symbol is already exists and is placed in a fragment. */ |
| |
| if (csym == NULL || symbol_get_frag (csym) == NULL) |
| { |
| as_bad ("expected `%s' to have already been set for .vtable_inherit", |
| cname); |
| bad = 1; |
| } |
| |
| *input_line_pointer = c; |
| |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer != ',') |
| { |
| as_bad ("expected comma after name in .vtable_inherit"); |
| ignore_rest_of_line (); |
| return NULL; |
| } |
| |
| ++input_line_pointer; |
| SKIP_WHITESPACE (); |
| |
| if (*input_line_pointer == '#') |
| ++input_line_pointer; |
| |
| if (input_line_pointer[0] == '0' |
| && (input_line_pointer[1] == '\0' |
| || ISSPACE (input_line_pointer[1]))) |
| { |
| psym = section_symbol (absolute_section); |
| ++input_line_pointer; |
| } |
| else |
| { |
| pname = input_line_pointer; |
| c = get_symbol_end (); |
| psym = symbol_find_or_make (pname); |
| *input_line_pointer = c; |
| } |
| |
| demand_empty_rest_of_line (); |
| |
| if (bad) |
| return NULL; |
| |
| assert (symbol_get_value_expression (csym)->X_op == O_constant); |
| return fix_new (symbol_get_frag (csym), |
| symbol_get_value_expression (csym)->X_add_number, |
| 0, psym, 0, 0, BFD_RELOC_VTABLE_INHERIT); |
| } |
| |
| /* This handles the .vtable_entry pseudo-op, which is used to indicate |
| to the linker that a vtable slot was used. The syntax is |
| ".vtable_entry tablename, offset". */ |
| |
| struct fix * |
| obj_elf_vtable_entry (int ignore ATTRIBUTE_UNUSED) |
| { |
| char *name; |
| symbolS *sym; |
| offsetT offset; |
| char c; |
| |
| if (*input_line_pointer == '#') |
| ++input_line_pointer; |
| |
| name = input_line_pointer; |
| c = get_symbol_end (); |
| sym = symbol_find_or_make (name); |
| *input_line_pointer = c; |
| |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer != ',') |
| { |
| as_bad ("expected comma after name in .vtable_entry"); |
| ignore_rest_of_line (); |
| return NULL; |
| } |
| |
| ++input_line_pointer; |
| if (*input_line_pointer == '#') |
| ++input_line_pointer; |
| |
| offset = get_absolute_expression (); |
| |
| demand_empty_rest_of_line (); |
| |
| return fix_new (frag_now, frag_now_fix (), 0, sym, offset, 0, |
| BFD_RELOC_VTABLE_ENTRY); |
| } |
| |
| void |
| elf_obj_read_begin_hook (void) |
| { |
| #ifdef NEED_ECOFF_DEBUG |
| if (ECOFF_DEBUGGING) |
| ecoff_read_begin_hook (); |
| #endif |
| } |
| |
| void |
| elf_obj_symbol_new_hook (symbolS *symbolP) |
| { |
| struct elf_obj_sy *sy_obj; |
| |
| sy_obj = symbol_get_obj (symbolP); |
| sy_obj->size = NULL; |
| sy_obj->versioned_name = NULL; |
| |
| #ifdef NEED_ECOFF_DEBUG |
| if (ECOFF_DEBUGGING) |
| ecoff_symbol_new_hook (symbolP); |
| #endif |
| } |
| |
| /* When setting one symbol equal to another, by default we probably |
| want them to have the same "size", whatever it means in the current |
| context. */ |
| |
| void |
| elf_copy_symbol_attributes (symbolS *dest, symbolS *src) |
| { |
| struct elf_obj_sy *srcelf = symbol_get_obj (src); |
| struct elf_obj_sy *destelf = symbol_get_obj (dest); |
| if (srcelf->size) |
| { |
| if (destelf->size == NULL) |
| destelf->size = xmalloc (sizeof (expressionS)); |
| *destelf->size = *srcelf->size; |
| } |
| else |
| { |
| if (destelf->size != NULL) |
| free (destelf->size); |
| destelf->size = NULL; |
| } |
| S_SET_SIZE (dest, S_GET_SIZE (src)); |
| /* Don't copy visibility. */ |
| S_SET_OTHER (dest, (ELF_ST_VISIBILITY (S_GET_OTHER (dest)) |
| | (S_GET_OTHER (src) & ~ELF_ST_VISIBILITY (-1)))); |
| } |
| |
| void |
| obj_elf_version (int ignore ATTRIBUTE_UNUSED) |
| { |
| char *name; |
| unsigned int c; |
| char *p; |
| asection *seg = now_seg; |
| subsegT subseg = now_subseg; |
| Elf_Internal_Note i_note; |
| Elf_External_Note e_note; |
| asection *note_secp = NULL; |
| int len; |
| |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer == '\"') |
| { |
| ++input_line_pointer; /* -> 1st char of string. */ |
| name = input_line_pointer; |
| |
| while (is_a_char (c = next_char_of_string ())) |
| ; |
| c = *input_line_pointer; |
| *input_line_pointer = '\0'; |
| *(input_line_pointer - 1) = '\0'; |
| *input_line_pointer = c; |
| |
| /* create the .note section */ |
| |
| note_secp = subseg_new (".note", 0); |
| bfd_set_section_flags (stdoutput, |
| note_secp, |
| SEC_HAS_CONTENTS | SEC_READONLY); |
| |
| /* process the version string */ |
| |
| len = strlen (name); |
| |
| i_note.namesz = ((len + 1) + 3) & ~3; /* round this to word boundary */ |
| i_note.descsz = 0; /* no description */ |
| i_note.type = NT_VERSION; |
| p = frag_more (sizeof (e_note.namesz)); |
| md_number_to_chars (p, i_note.namesz, sizeof (e_note.namesz)); |
| p = frag_more (sizeof (e_note.descsz)); |
| md_number_to_chars (p, i_note.descsz, sizeof (e_note.descsz)); |
| p = frag_more (sizeof (e_note.type)); |
| md_number_to_chars (p, i_note.type, sizeof (e_note.type)); |
| p = frag_more (len + 1); |
| strcpy (p, name); |
| |
| frag_align (2, 0, 0); |
| |
| subseg_set (seg, subseg); |
| } |
| else |
| { |
| as_bad (_("expected quoted string")); |
| } |
| demand_empty_rest_of_line (); |
| } |
| |
| static void |
| obj_elf_size (int ignore ATTRIBUTE_UNUSED) |
| { |
| char *name = input_line_pointer; |
| char c = get_symbol_end (); |
| char *p; |
| expressionS exp; |
| symbolS *sym; |
| |
| p = input_line_pointer; |
| *p = c; |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer != ',') |
| { |
| *p = 0; |
| as_bad (_("expected comma after name `%s' in .size directive"), name); |
| *p = c; |
| ignore_rest_of_line (); |
| return; |
| } |
| input_line_pointer++; |
| expression (&exp); |
| if (exp.X_op == O_absent) |
| { |
| as_bad (_("missing expression in .size directive")); |
| exp.X_op = O_constant; |
| exp.X_add_number = 0; |
| } |
| *p = 0; |
| sym = symbol_find_or_make (name); |
| *p = c; |
| if (exp.X_op == O_constant) |
| { |
| S_SET_SIZE (sym, exp.X_add_number); |
| if (symbol_get_obj (sym)->size) |
| { |
| xfree (symbol_get_obj (sym)->size); |
| symbol_get_obj (sym)->size = NULL; |
| } |
| } |
| else |
| { |
| symbol_get_obj (sym)->size = xmalloc (sizeof (expressionS)); |
| *symbol_get_obj (sym)->size = exp; |
| } |
| demand_empty_rest_of_line (); |
| } |
| |
| /* Handle the ELF .type pseudo-op. This sets the type of a symbol. |
| There are five syntaxes: |
| |
| The first (used on Solaris) is |
| .type SYM,#function |
| The second (used on UnixWare) is |
| .type SYM,@function |
| The third (reportedly to be used on Irix 6.0) is |
| .type SYM STT_FUNC |
| The fourth (used on NetBSD/Arm and Linux/ARM) is |
| .type SYM,%function |
| The fifth (used on SVR4/860) is |
| .type SYM,"function" |
| */ |
| |
| static void |
| obj_elf_type (int ignore ATTRIBUTE_UNUSED) |
| { |
| char *name; |
| char c; |
| int type; |
| const char *typename; |
| symbolS *sym; |
| elf_symbol_type *elfsym; |
| |
| name = input_line_pointer; |
| c = get_symbol_end (); |
| sym = symbol_find_or_make (name); |
| elfsym = (elf_symbol_type *) symbol_get_bfdsym (sym); |
| *input_line_pointer = c; |
| |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer == ',') |
| ++input_line_pointer; |
| |
| SKIP_WHITESPACE (); |
| if ( *input_line_pointer == '#' |
| || *input_line_pointer == '@' |
| || *input_line_pointer == '"' |
| || *input_line_pointer == '%') |
| ++input_line_pointer; |
| |
| typename = input_line_pointer; |
| c = get_symbol_end (); |
| |
| type = 0; |
| if (strcmp (typename, "function") == 0 |
| || strcmp (typename, "STT_FUNC") == 0) |
| type = BSF_FUNCTION; |
| else if (strcmp (typename, "object") == 0 |
| || strcmp (typename, "STT_OBJECT") == 0) |
| type = BSF_OBJECT; |
| else if (strcmp (typename, "tls_object") == 0 |
| || strcmp (typename, "STT_TLS") == 0) |
| type = BSF_OBJECT | BSF_THREAD_LOCAL; |
| else if (strcmp (typename, "notype") == 0 |
| || strcmp (typename, "STT_NOTYPE") == 0) |
| ; |
| #ifdef md_elf_symbol_type |
| else if ((type = md_elf_symbol_type (typename, sym, elfsym)) != -1) |
| ; |
| #endif |
| else |
| as_bad (_("unrecognized symbol type \"%s\""), typename); |
| |
| *input_line_pointer = c; |
| |
| if (*input_line_pointer == '"') |
| ++input_line_pointer; |
| |
| elfsym->symbol.flags |= type; |
| |
| demand_empty_rest_of_line (); |
| } |
| |
| static void |
| obj_elf_ident (int ignore ATTRIBUTE_UNUSED) |
| { |
| static segT comment_section; |
| segT old_section = now_seg; |
| int old_subsection = now_subseg; |
| |
| #ifdef md_flush_pending_output |
| md_flush_pending_output (); |
| #endif |
| |
| if (!comment_section) |
| { |
| char *p; |
| comment_section = subseg_new (".comment", 0); |
| bfd_set_section_flags (stdoutput, comment_section, |
| SEC_READONLY | SEC_HAS_CONTENTS); |
| p = frag_more (1); |
| *p = 0; |
| } |
| else |
| subseg_set (comment_section, 0); |
| stringer (1); |
| subseg_set (old_section, old_subsection); |
| } |
| |
| #ifdef INIT_STAB_SECTION |
| |
| /* The first entry in a .stabs section is special. */ |
| |
| void |
| obj_elf_init_stab_section (segT seg) |
| { |
| char *file; |
| char *p; |
| char *stabstr_name; |
| unsigned int stroff; |
| |
| /* Force the section to align to a longword boundary. Without this, |
| UnixWare ar crashes. */ |
| bfd_set_section_alignment (stdoutput, seg, 2); |
| |
| /* Make space for this first symbol. */ |
| p = frag_more (12); |
| /* Zero it out. */ |
| memset (p, 0, 12); |
| as_where (&file, NULL); |
| stabstr_name = xmalloc (strlen (segment_name (seg)) + 4); |
| strcpy (stabstr_name, segment_name (seg)); |
| strcat (stabstr_name, "str"); |
| stroff = get_stab_string_offset (file, stabstr_name); |
| know (stroff == 1); |
| md_number_to_chars (p, stroff, 4); |
| seg_info (seg)->stabu.p = p; |
| } |
| |
| #endif |
| |
| /* Fill in the counts in the first entry in a .stabs section. */ |
| |
| static void |
| adjust_stab_sections (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED) |
| { |
| char *name; |
| asection *strsec; |
| char *p; |
| int strsz, nsyms; |
| |
| if (strncmp (".stab", sec->name, 5)) |
| return; |
| if (!strcmp ("str", sec->name + strlen (sec->name) - 3)) |
| return; |
| |
| name = alloca (strlen (sec->name) + 4); |
| strcpy (name, sec->name); |
| strcat (name, "str"); |
| strsec = bfd_get_section_by_name (abfd, name); |
| if (strsec) |
| strsz = bfd_section_size (abfd, strsec); |
| else |
| strsz = 0; |
| nsyms = bfd_section_size (abfd, sec) / 12 - 1; |
| |
| p = seg_info (sec)->stabu.p; |
| assert (p != 0); |
| |
| bfd_h_put_16 (abfd, nsyms, p + 6); |
| bfd_h_put_32 (abfd, strsz, p + 8); |
| } |
| |
| #ifdef NEED_ECOFF_DEBUG |
| |
| /* This function is called by the ECOFF code. It is supposed to |
| record the external symbol information so that the backend can |
| write it out correctly. The ELF backend doesn't actually handle |
| this at the moment, so we do it ourselves. We save the information |
| in the symbol. */ |
| |
| void |
| elf_ecoff_set_ext (symbolS *sym, struct ecoff_extr *ext) |
| { |
| symbol_get_bfdsym (sym)->udata.p = ext; |
| } |
| |
| /* This function is called by bfd_ecoff_debug_externals. It is |
| supposed to *EXT to the external symbol information, and return |
| whether the symbol should be used at all. */ |
| |
| static bfd_boolean |
| elf_get_extr (asymbol *sym, EXTR *ext) |
| { |
| if (sym->udata.p == NULL) |
| return FALSE; |
| *ext = *(EXTR *) sym->udata.p; |
| return TRUE; |
| } |
| |
| /* This function is called by bfd_ecoff_debug_externals. It has |
| nothing to do for ELF. */ |
| |
| static void |
| elf_set_index (asymbol *sym ATTRIBUTE_UNUSED, |
| bfd_size_type indx ATTRIBUTE_UNUSED) |
| { |
| } |
| |
| #endif /* NEED_ECOFF_DEBUG */ |
| |
| void |
| elf_frob_symbol (symbolS *symp, int *puntp) |
| { |
| struct elf_obj_sy *sy_obj; |
| |
| #ifdef NEED_ECOFF_DEBUG |
| if (ECOFF_DEBUGGING) |
| ecoff_frob_symbol (symp); |
| #endif |
| |
| sy_obj = symbol_get_obj (symp); |
| |
| if (sy_obj->size != NULL) |
| { |
| switch (sy_obj->size->X_op) |
| { |
| case O_subtract: |
| S_SET_SIZE (symp, |
| (S_GET_VALUE (sy_obj->size->X_add_symbol) |
| + sy_obj->size->X_add_number |
| - S_GET_VALUE (sy_obj->size->X_op_symbol))); |
| break; |
| case O_constant: |
| S_SET_SIZE (symp, |
| (S_GET_VALUE (sy_obj->size->X_add_symbol) |
| + sy_obj->size->X_add_number)); |
| break; |
| default: |
| as_bad (_(".size expression too complicated to fix up")); |
| break; |
| } |
| free (sy_obj->size); |
| sy_obj->size = NULL; |
| } |
| |
| if (sy_obj->versioned_name != NULL) |
| { |
| char *p; |
| |
| p = strchr (sy_obj->versioned_name, ELF_VER_CHR); |
| know (p != NULL); |
| |
| /* This symbol was given a new name with the .symver directive. |
| |
| If this is an external reference, just rename the symbol to |
| include the version string. This will make the relocs be |
| against the correct versioned symbol. |
| |
| If this is a definition, add an alias. FIXME: Using an alias |
| will permit the debugging information to refer to the right |
| symbol. However, it's not clear whether it is the best |
| approach. */ |
| |
| if (! S_IS_DEFINED (symp)) |
| { |
| /* Verify that the name isn't using the @@ syntax--this is |
| reserved for definitions of the default version to link |
| against. */ |
| if (p[1] == ELF_VER_CHR) |
| { |
| as_bad (_("invalid attempt to declare external version name as default in symbol `%s'"), |
| sy_obj->versioned_name); |
| *puntp = TRUE; |
| } |
| S_SET_NAME (symp, sy_obj->versioned_name); |
| } |
| else |
| { |
| if (p[1] == ELF_VER_CHR && p[2] == ELF_VER_CHR) |
| { |
| size_t l; |
| |
| /* The @@@ syntax is a special case. It renames the |
| symbol name to versioned_name with one `@' removed. */ |
| l = strlen (&p[3]) + 1; |
| memmove (&p[2], &p[3], l); |
| S_SET_NAME (symp, sy_obj->versioned_name); |
| } |
| else |
| { |
| symbolS *symp2; |
| |
| /* FIXME: Creating a new symbol here is risky. We're |
| in the final loop over the symbol table. We can |
| get away with it only because the symbol goes to |
| the end of the list, where the loop will still see |
| it. It would probably be better to do this in |
| obj_frob_file_before_adjust. */ |
| |
| symp2 = symbol_find_or_make (sy_obj->versioned_name); |
| |
| /* Now we act as though we saw symp2 = sym. */ |
| |
| S_SET_SEGMENT (symp2, S_GET_SEGMENT (symp)); |
| |
| /* Subtracting out the frag address here is a hack |
| because we are in the middle of the final loop. */ |
| S_SET_VALUE (symp2, |
| (S_GET_VALUE (symp) |
| - symbol_get_frag (symp)->fr_address)); |
| |
| symbol_set_frag (symp2, symbol_get_frag (symp)); |
| |
| /* This will copy over the size information. */ |
| copy_symbol_attributes (symp2, symp); |
| |
| S_SET_OTHER (symp2, S_GET_OTHER (symp)); |
| |
| if (S_IS_WEAK (symp)) |
| S_SET_WEAK (symp2); |
| |
| if (S_IS_EXTERNAL (symp)) |
| S_SET_EXTERNAL (symp2); |
| } |
| } |
| } |
| |
| /* Double check weak symbols. */ |
| if (S_IS_WEAK (symp)) |
| { |
| if (S_IS_COMMON (symp)) |
| as_bad (_("symbol `%s' can not be both weak and common"), |
| S_GET_NAME (symp)); |
| } |
| |
| #ifdef TC_MIPS |
| /* The Irix 5 and 6 assemblers set the type of any common symbol and |
| any undefined non-function symbol to STT_OBJECT. We try to be |
| compatible, since newer Irix 5 and 6 linkers care. However, we |
| only set undefined symbols to be STT_OBJECT if we are on Irix, |
| because that is the only time gcc will generate the necessary |
| .global directives to mark functions. */ |
| |
| if (S_IS_COMMON (symp)) |
| symbol_get_bfdsym (symp)->flags |= BSF_OBJECT; |
| |
| if (strstr (TARGET_OS, "irix") != NULL |
| && ! S_IS_DEFINED (symp) |
| && (symbol_get_bfdsym (symp)->flags & BSF_FUNCTION) == 0) |
| symbol_get_bfdsym (symp)->flags |= BSF_OBJECT; |
| #endif |
| |
| #if 0 /* TC_PPC */ |
| /* If TC_PPC is defined, we used to force the type of a symbol to be |
| BSF_OBJECT if it was otherwise unset. This was required by some |
| version of VxWorks. Thomas de Lellis <tdel@windriver.com> says |
| that this is no longer needed, so it is now commented out. */ |
| if ((symbol_get_bfdsym (symp)->flags |
| & (BSF_FUNCTION | BSF_FILE | BSF_SECTION_SYM)) == 0 |
| && S_IS_DEFINED (symp)) |
| symbol_get_bfdsym (symp)->flags |= BSF_OBJECT; |
| #endif |
| } |
| |
| struct group_list |
| { |
| asection **head; /* Section lists. */ |
| unsigned int *elt_count; /* Number of sections in each list. */ |
| unsigned int num_group; /* Number of lists. */ |
| }; |
| |
| /* Called via bfd_map_over_sections. If SEC is a member of a group, |
| add it to a list of sections belonging to the group. INF is a |
| pointer to a struct group_list, which is where we store the head of |
| each list. */ |
| |
| static void |
| build_group_lists (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf) |
| { |
| struct group_list *list = inf; |
| const char *group_name = elf_group_name (sec); |
| unsigned int i; |
| |
| if (group_name == NULL) |
| return; |
| |
| /* If this group already has a list, add the section to the head of |
| the list. */ |
| for (i = 0; i < list->num_group; i++) |
| { |
| if (strcmp (group_name, elf_group_name (list->head[i])) == 0) |
| { |
| elf_next_in_group (sec) = list->head[i]; |
| list->head[i] = sec; |
| list->elt_count[i] += 1; |
| return; |
| } |
| } |
| |
| /* New group. Make the arrays bigger in chunks to minimize calls to |
| realloc. */ |
| i = list->num_group; |
| if ((i & 127) == 0) |
| { |
| unsigned int newsize = i + 128; |
| list->head = xrealloc (list->head, newsize * sizeof (*list->head)); |
| list->elt_count = xrealloc (list->elt_count, |
| newsize * sizeof (*list->elt_count)); |
| } |
| list->head[i] = sec; |
| list->elt_count[i] = 1; |
| list->num_group += 1; |
| } |
| |
| void |
| elf_frob_file (void) |
| { |
| struct group_list list; |
| unsigned int i; |
| |
| bfd_map_over_sections (stdoutput, adjust_stab_sections, NULL); |
| |
| /* Go find section groups. */ |
| list.num_group = 0; |
| list.head = NULL; |
| list.elt_count = NULL; |
| bfd_map_over_sections (stdoutput, build_group_lists, &list); |
| |
| /* Make the SHT_GROUP sections that describe each section group. We |
| can't set up the section contents here yet, because elf section |
| indices have yet to be calculated. elf.c:set_group_contents does |
| the rest of the work. */ |
| for (i = 0; i < list.num_group; i++) |
| { |
| const char *group_name = elf_group_name (list.head[i]); |
| const char *sec_name; |
| asection *s; |
| flagword flags; |
| struct symbol *sy; |
| int has_sym; |
| bfd_size_type size; |
| |
| flags = SEC_READONLY | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_GROUP; |
| for (s = list.head[i]; s != NULL; s = elf_next_in_group (s)) |
| if ((s->flags ^ flags) & SEC_LINK_ONCE) |
| { |
| flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD; |
| if (s != list.head[i]) |
| { |
| as_warn (_("assuming all members of group `%s' are COMDAT"), |
| group_name); |
| break; |
| } |
| } |
| |
| sec_name = group_name; |
| sy = symbol_find_exact (group_name); |
| has_sym = 0; |
| if (sy != NULL |
| && (sy == symbol_lastP |
| || (sy->sy_next != NULL |
| && sy->sy_next->sy_previous == sy))) |
| { |
| has_sym = 1; |
| sec_name = ".group"; |
| } |
| s = subseg_force_new (sec_name, 0); |
| if (s == NULL |
| || !bfd_set_section_flags (stdoutput, s, flags) |
| || !bfd_set_section_alignment (stdoutput, s, 2)) |
| { |
| as_fatal (_("can't create group: %s"), |
| bfd_errmsg (bfd_get_error ())); |
| } |
| elf_section_type (s) = SHT_GROUP; |
| |
| /* Pass a pointer to the first section in this group. */ |
| elf_next_in_group (s) = list.head[i]; |
| if (has_sym) |
| elf_group_id (s) = sy->bsym; |
| |
| size = 4 * (list.elt_count[i] + 1); |
| bfd_set_section_size (stdoutput, s, size); |
| s->contents = frag_more (size); |
| frag_now->fr_fix = frag_now_fix_octets (); |
| } |
| |
| #ifdef elf_tc_final_processing |
| elf_tc_final_processing (); |
| #endif |
| } |
| |
| /* It removes any unneeded versioned symbols from the symbol table. */ |
| |
| void |
| elf_frob_file_before_adjust (void) |
| { |
| if (symbol_rootP) |
| { |
| symbolS *symp; |
| |
| for (symp = symbol_rootP; symp; symp = symbol_next (symp)) |
| if (!S_IS_DEFINED (symp)) |
| { |
| if (symbol_get_obj (symp)->versioned_name) |
| { |
| char *p; |
| |
| /* The @@@ syntax is a special case. If the symbol is |
| not defined, 2 `@'s will be removed from the |
| versioned_name. */ |
| |
| p = strchr (symbol_get_obj (symp)->versioned_name, |
| ELF_VER_CHR); |
| know (p != NULL); |
| if (p[1] == ELF_VER_CHR && p[2] == ELF_VER_CHR) |
| { |
| size_t l = strlen (&p[3]) + 1; |
| memmove (&p[1], &p[3], l); |
| } |
| if (symbol_used_p (symp) == 0 |
| && symbol_used_in_reloc_p (symp) == 0) |
| symbol_remove (symp, &symbol_rootP, &symbol_lastP); |
| } |
| |
| /* If there was .weak foo, but foo was neither defined nor |
| used anywhere, remove it. */ |
| |
| else if (S_IS_WEAK (symp) |
| && symbol_used_p (symp) == 0 |
| && symbol_used_in_reloc_p (symp) == 0) |
| symbol_remove (symp, &symbol_rootP, &symbol_lastP); |
| } |
| } |
| } |
| |
| /* It is required that we let write_relocs have the opportunity to |
| optimize away fixups before output has begun, since it is possible |
| to eliminate all fixups for a section and thus we never should |
| have generated the relocation section. */ |
| |
| void |
| elf_frob_file_after_relocs (void) |
| { |
| #ifdef NEED_ECOFF_DEBUG |
| if (ECOFF_DEBUGGING) |
| /* Generate the ECOFF debugging information. */ |
| { |
| const struct ecoff_debug_swap *debug_swap; |
| struct ecoff_debug_info debug; |
| char *buf; |
| asection *sec; |
| |
| debug_swap |
| = get_elf_backend_data (stdoutput)->elf_backend_ecoff_debug_swap; |
| know (debug_swap != NULL); |
| ecoff_build_debug (&debug.symbolic_header, &buf, debug_swap); |
| |
| /* Set up the pointers in debug. */ |
| #define SET(ptr, offset, type) \ |
| debug.ptr = (type) (buf + debug.symbolic_header.offset) |
| |
| SET (line, cbLineOffset, unsigned char *); |
| SET (external_dnr, cbDnOffset, void *); |
| SET (external_pdr, cbPdOffset, void *); |
| SET (external_sym, cbSymOffset, void *); |
| SET (external_opt, cbOptOffset, void *); |
| SET (external_aux, cbAuxOffset, union aux_ext *); |
| SET (ss, cbSsOffset, char *); |
| SET (external_fdr, cbFdOffset, void *); |
| SET (external_rfd, cbRfdOffset, void *); |
| /* ssext and external_ext are set up just below. */ |
| |
| #undef SET |
| |
| /* Set up the external symbols. */ |
| debug.ssext = debug.ssext_end = NULL; |
| debug.external_ext = debug.external_ext_end = NULL; |
| if (! bfd_ecoff_debug_externals (stdoutput, &debug, debug_swap, TRUE, |
| elf_get_extr, elf_set_index)) |
| as_fatal (_("failed to set up debugging information: %s"), |
| bfd_errmsg (bfd_get_error ())); |
| |
| sec = bfd_get_section_by_name (stdoutput, ".mdebug"); |
| assert (sec != NULL); |
| |
| know (!stdoutput->output_has_begun); |
| |
| /* We set the size of the section, call bfd_set_section_contents |
| to force the ELF backend to allocate a file position, and then |
| write out the data. FIXME: Is this really the best way to do |
| this? */ |
| bfd_set_section_size |
| (stdoutput, sec, bfd_ecoff_debug_size (stdoutput, &debug, debug_swap)); |
| |
| /* Pass BUF to bfd_set_section_contents because this will |
| eventually become a call to fwrite, and ISO C prohibits |
| passing a NULL pointer to a stdio function even if the |
| pointer will not be used. */ |
| if (! bfd_set_section_contents (stdoutput, sec, buf, 0, 0)) |
| as_fatal (_("can't start writing .mdebug section: %s"), |
| bfd_errmsg (bfd_get_error ())); |
| |
| know (stdoutput->output_has_begun); |
| know (sec->filepos != 0); |
| |
| if (! bfd_ecoff_write_debug (stdoutput, &debug, debug_swap, |
| sec->filepos)) |
| as_fatal (_("could not write .mdebug section: %s"), |
| bfd_errmsg (bfd_get_error ())); |
| } |
| #endif /* NEED_ECOFF_DEBUG */ |
| } |
| |
| #ifdef SCO_ELF |
| |
| /* Heavily plagiarized from obj_elf_version. The idea is to emit the |
| SCO specific identifier in the .notes section to satisfy the SCO |
| linker. |
| |
| This looks more complicated than it really is. As opposed to the |
| "obvious" solution, this should handle the cross dev cases |
| correctly. (i.e, hosting on a 64 bit big endian processor, but |
| generating SCO Elf code) Efficiency isn't a concern, as there |
| should be exactly one of these sections per object module. |
| |
| SCO OpenServer 5 identifies it's ELF modules with a standard ELF |
| .note section. |
| |
| int_32 namesz = 4 ; Name size |
| int_32 descsz = 12 ; Descriptive information |
| int_32 type = 1 ; |
| char name[4] = "SCO" ; Originator name ALWAYS SCO + NULL |
| int_32 version = (major ver # << 16) | version of tools ; |
| int_32 source = (tool_id << 16 ) | 1 ; |
| int_32 info = 0 ; These are set by the SCO tools, but we |
| don't know enough about the source |
| environment to set them. SCO ld currently |
| ignores them, and recommends we set them |
| to zero. */ |
| |
| #define SCO_MAJOR_VERSION 0x1 |
| #define SCO_MINOR_VERSION 0x1 |
| |
| void |
| sco_id (void) |
| { |
| |
| char *name; |
| unsigned int c; |
| char ch; |
| char *p; |
| asection *seg = now_seg; |
| subsegT subseg = now_subseg; |
| Elf_Internal_Note i_note; |
| Elf_External_Note e_note; |
| asection *note_secp = NULL; |
| int i, len; |
| |
| /* create the .note section */ |
| |
| note_secp = subseg_new (".note", 0); |
| bfd_set_section_flags (stdoutput, |
| note_secp, |
| SEC_HAS_CONTENTS | SEC_READONLY); |
| |
| /* process the version string */ |
| |
| i_note.namesz = 4; |
| i_note.descsz = 12; /* 12 descriptive bytes */ |
| i_note.type = NT_VERSION; /* Contains a version string */ |
| |
| p = frag_more (sizeof (i_note.namesz)); |
| md_number_to_chars (p, i_note.namesz, 4); |
| |
| p = frag_more (sizeof (i_note.descsz)); |
| md_number_to_chars (p, i_note.descsz, 4); |
| |
| p = frag_more (sizeof (i_note.type)); |
| md_number_to_chars (p, i_note.type, 4); |
| |
| p = frag_more (4); |
| strcpy (p, "SCO"); |
| |
| /* Note: this is the version number of the ELF we're representing */ |
| p = frag_more (4); |
| md_number_to_chars (p, (SCO_MAJOR_VERSION << 16) | (SCO_MINOR_VERSION), 4); |
| |
| /* Here, we pick a magic number for ourselves (yes, I "registered" |
| it with SCO. The bottom bit shows that we are compat with the |
| SCO ABI. */ |
| p = frag_more (4); |
| md_number_to_chars (p, 0x4c520000 | 0x0001, 4); |
| |
| /* If we knew (or cared) what the source language options were, we'd |
| fill them in here. SCO has given us permission to ignore these |
| and just set them to zero. */ |
| p = frag_more (4); |
| md_number_to_chars (p, 0x0000, 4); |
| |
| frag_align (2, 0, 0); |
| |
| /* We probably can't restore the current segment, for there likely |
| isn't one yet... */ |
| if (seg && subseg) |
| subseg_set (seg, subseg); |
| |
| } |
| |
| #endif /* SCO_ELF */ |
| |
| static int |
| elf_separate_stab_sections (void) |
| { |
| #ifdef NEED_ECOFF_DEBUG |
| return (!ECOFF_DEBUGGING); |
| #else |
| return 1; |
| #endif |
| } |
| |
| static void |
| elf_init_stab_section (segT seg) |
| { |
| #ifdef NEED_ECOFF_DEBUG |
| if (!ECOFF_DEBUGGING) |
| #endif |
| obj_elf_init_stab_section (seg); |
| } |
| |
| const struct format_ops elf_format_ops = |
| { |
| bfd_target_elf_flavour, |
| 0, /* dfl_leading_underscore */ |
| 1, /* emit_section_symbols */ |
| elf_begin, |
| elf_file_symbol, |
| elf_frob_symbol, |
| elf_frob_file, |
| elf_frob_file_before_adjust, |
| 0, /* obj_frob_file_before_fix */ |
| elf_frob_file_after_relocs, |
| elf_s_get_size, elf_s_set_size, |
| elf_s_get_align, elf_s_set_align, |
| elf_s_get_other, |
| elf_s_set_other, |
| 0, /* s_get_desc */ |
| 0, /* s_set_desc */ |
| 0, /* s_get_type */ |
| 0, /* s_set_type */ |
| elf_copy_symbol_attributes, |
| #ifdef NEED_ECOFF_DEBUG |
| ecoff_generate_asm_lineno, |
| ecoff_stab, |
| #else |
| 0, /* generate_asm_lineno */ |
| 0, /* process_stab */ |
| #endif |
| elf_separate_stab_sections, |
| elf_init_stab_section, |
| elf_sec_sym_ok_for_reloc, |
| elf_pop_insert, |
| #ifdef NEED_ECOFF_DEBUG |
| elf_ecoff_set_ext, |
| #else |
| 0, /* ecoff_set_ext */ |
| #endif |
| elf_obj_read_begin_hook, |
| elf_obj_symbol_new_hook |
| }; |