| /* ELF object file format |
| Copyright (C) 1992, 93, 94, 95, 96, 97, 98, 1999 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 "subsegs.h" |
| #include "obstack.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 |
| |
| static bfd_vma elf_s_get_size PARAMS ((symbolS *)); |
| static void elf_s_set_size PARAMS ((symbolS *, bfd_vma)); |
| static bfd_vma elf_s_get_align PARAMS ((symbolS *)); |
| static void elf_s_set_align PARAMS ((symbolS *, bfd_vma)); |
| static void elf_copy_symbol_attributes PARAMS ((symbolS *, symbolS *)); |
| static int elf_sec_sym_ok_for_reloc PARAMS ((asection *)); |
| static void adjust_stab_sections PARAMS ((bfd *, asection *, PTR)); |
| |
| #ifdef NEED_ECOFF_DEBUG |
| static boolean elf_get_extr PARAMS ((asymbol *, EXTR *)); |
| static void elf_set_index PARAMS ((asymbol *, bfd_size_type)); |
| #endif |
| |
| static void obj_elf_line PARAMS ((int)); |
| void obj_elf_version PARAMS ((int)); |
| static void obj_elf_size PARAMS ((int)); |
| static void obj_elf_type PARAMS ((int)); |
| static void obj_elf_ident PARAMS ((int)); |
| static void obj_elf_weak PARAMS ((int)); |
| static void obj_elf_local PARAMS ((int)); |
| static void obj_elf_common PARAMS ((int)); |
| static void obj_elf_symver PARAMS ((int)); |
| static void obj_elf_vtable_inherit PARAMS ((int)); |
| static void obj_elf_vtable_entry PARAMS ((int)); |
| static void obj_elf_data PARAMS ((int)); |
| static void obj_elf_text PARAMS ((int)); |
| static void obj_elf_subsection PARAMS ((int)); |
| |
| static const pseudo_typeS elf_pseudo_table[] = |
| { |
| {"comm", obj_elf_common, 0}, |
| {"ident", obj_elf_ident, 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}, |
| {"size", obj_elf_size, 0}, |
| {"type", obj_elf_type, 0}, |
| {"version", obj_elf_version, 0}, |
| {"weak", obj_elf_weak, 0}, |
| |
| /* 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", obj_elf_vtable_inherit, 0}, |
| {"vtable_entry", obj_elf_vtable_entry, 0}, |
| |
| /* These are used for dwarf. */ |
| {"2byte", cons, 2}, |
| {"4byte", cons, 4}, |
| {"8byte", cons, 8}, |
| |
| /* We need to trap the section changing calls to handle .previous. */ |
| {"data", obj_elf_data, 0}, |
| {"text", obj_elf_text, 0}, |
| |
| /* End sentinel. */ |
| {NULL}, |
| }; |
| |
| 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} /* end sentinel */ |
| }; |
| |
| #undef NO_RELOC |
| #include "aout/aout64.h" |
| |
| /* This is called when the assembler starts. */ |
| |
| void |
| elf_begin () |
| { |
| /* Add symbols for the known sections to the symbol table. */ |
| symbol_table_insert (section_symbol (bfd_get_section_by_name (stdoutput, |
| TEXT_SECTION_NAME))); |
| symbol_table_insert (section_symbol (bfd_get_section_by_name (stdoutput, |
| DATA_SECTION_NAME))); |
| symbol_table_insert (section_symbol (bfd_get_section_by_name (stdoutput, |
| BSS_SECTION_NAME))); |
| } |
| |
| void |
| elf_pop_insert () |
| { |
| pop_insert (elf_pseudo_table); |
| if (ECOFF_DEBUGGING) |
| pop_insert (ecoff_debug_pseudo_table); |
| } |
| |
| static bfd_vma |
| elf_s_get_size (sym) |
| symbolS *sym; |
| { |
| return S_GET_SIZE (sym); |
| } |
| |
| static void |
| elf_s_set_size (sym, sz) |
| symbolS *sym; |
| bfd_vma sz; |
| { |
| S_SET_SIZE (sym, sz); |
| } |
| |
| static bfd_vma |
| elf_s_get_align (sym) |
| symbolS *sym; |
| { |
| return S_GET_ALIGN (sym); |
| } |
| |
| static void |
| elf_s_set_align (sym, align) |
| symbolS *sym; |
| bfd_vma align; |
| { |
| S_SET_ALIGN (sym, align); |
| } |
| |
| static void |
| elf_copy_symbol_attributes (dest, src) |
| symbolS *dest, *src; |
| { |
| OBJ_COPY_SYMBOL_ATTRIBUTES (dest, src); |
| } |
| |
| static int |
| elf_sec_sym_ok_for_reloc (sec) |
| asection *sec; |
| { |
| return obj_sec_sym_ok_for_reloc (sec); |
| } |
| |
| void |
| elf_file_symbol (s) |
| char *s; |
| { |
| symbolS *sym; |
| |
| sym = symbol_new (s, absolute_section, (valueT) 0, (struct frag *) 0); |
| sym->sy_frag = &zero_address_frag; |
| sym->bsym->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 |
| } |
| |
| static void |
| obj_elf_common (ignore) |
| int ignore; |
| { |
| char *name; |
| char c; |
| char *p; |
| int temp, size; |
| symbolS *symbolP; |
| int have_align; |
| |
| name = input_line_pointer; |
| c = get_symbol_end (); |
| /* just after name is now '\0' */ |
| p = input_line_pointer; |
| *p = c; |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer != ',') |
| { |
| as_bad (_("Expected comma after symbol-name")); |
| ignore_rest_of_line (); |
| return; |
| } |
| input_line_pointer++; /* skip ',' */ |
| if ((temp = get_absolute_expression ()) < 0) |
| { |
| as_bad (_(".COMMon length (%d.) <0! Ignored."), temp); |
| ignore_rest_of_line (); |
| return; |
| } |
| size = temp; |
| *p = 0; |
| symbolP = symbol_find_or_make (name); |
| *p = c; |
| if (S_IS_DEFINED (symbolP) && ! S_IS_COMMON (symbolP)) |
| { |
| as_bad (_("Ignoring attempt to re-define symbol")); |
| ignore_rest_of_line (); |
| return; |
| } |
| if (S_GET_VALUE (symbolP) != 0) |
| { |
| if (S_GET_VALUE (symbolP) != size) |
| { |
| as_warn (_("Length of .comm \"%s\" is already %ld. Not changed to %d."), |
| S_GET_NAME (symbolP), (long) S_GET_VALUE (symbolP), size); |
| } |
| } |
| know (symbolP->sy_frag == &zero_address_frag); |
| if (*input_line_pointer != ',') |
| have_align = 0; |
| else |
| { |
| have_align = 1; |
| input_line_pointer++; |
| SKIP_WHITESPACE (); |
| } |
| if (! have_align || *input_line_pointer != '"') |
| { |
| if (! have_align) |
| temp = 0; |
| else |
| { |
| temp = get_absolute_expression (); |
| if (temp < 0) |
| { |
| temp = 0; |
| as_warn (_("Common alignment negative; 0 assumed")); |
| } |
| } |
| if (symbolP->local) |
| { |
| segT old_sec; |
| int old_subsec; |
| char *pfrag; |
| int align; |
| |
| /* allocate_bss: */ |
| old_sec = now_seg; |
| old_subsec = now_subseg; |
| if (temp) |
| { |
| /* convert to a power of 2 alignment */ |
| for (align = 0; (temp & 1) == 0; temp >>= 1, ++align); |
| if (temp != 1) |
| { |
| as_bad (_("Common alignment not a power of 2")); |
| ignore_rest_of_line (); |
| return; |
| } |
| } |
| else |
| align = 0; |
| record_alignment (bss_section, align); |
| subseg_set (bss_section, 0); |
| if (align) |
| frag_align (align, 0, 0); |
| if (S_GET_SEGMENT (symbolP) == bss_section) |
| symbolP->sy_frag->fr_symbol = 0; |
| symbolP->sy_frag = frag_now; |
| pfrag = frag_var (rs_org, 1, 1, (relax_substateT) 0, symbolP, |
| (offsetT) size, (char *) 0); |
| *pfrag = 0; |
| S_SET_SIZE (symbolP, size); |
| S_SET_SEGMENT (symbolP, bss_section); |
| S_CLEAR_EXTERNAL (symbolP); |
| subseg_set (old_sec, old_subsec); |
| } |
| else |
| { |
| allocate_common: |
| S_SET_VALUE (symbolP, (valueT) size); |
| S_SET_ALIGN (symbolP, temp); |
| S_SET_EXTERNAL (symbolP); |
| S_SET_SEGMENT (symbolP, bfd_com_section_ptr); |
| } |
| } |
| else |
| { |
| input_line_pointer++; |
| /* @@ Some use the dot, some don't. Can we get some consistency?? */ |
| if (*input_line_pointer == '.') |
| input_line_pointer++; |
| /* @@ Some say data, some say bss. */ |
| if (strncmp (input_line_pointer, "bss\"", 4) |
| && strncmp (input_line_pointer, "data\"", 5)) |
| { |
| while (*--input_line_pointer != '"') |
| ; |
| input_line_pointer--; |
| goto bad_common_segment; |
| } |
| while (*input_line_pointer++ != '"') |
| ; |
| goto allocate_common; |
| } |
| |
| symbolP->bsym->flags |= BSF_OBJECT; |
| |
| demand_empty_rest_of_line (); |
| return; |
| |
| { |
| bad_common_segment: |
| p = input_line_pointer; |
| while (*p && *p != '\n') |
| p++; |
| c = *p; |
| *p = '\0'; |
| as_bad (_("bad .common segment %s"), input_line_pointer + 1); |
| *p = c; |
| input_line_pointer = p; |
| ignore_rest_of_line (); |
| return; |
| } |
| } |
| |
| static void |
| obj_elf_local (ignore) |
| int ignore; |
| { |
| 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); |
| 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 (ignore) |
| int ignore; |
| { |
| 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); |
| 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 segT previous_section; |
| static int previous_subsection; |
| |
| /* 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. */ |
| |
| /* Certain named sections have particular defined types, listed on p. |
| 4-19 of the ABI. */ |
| struct special_section |
| { |
| const char *name; |
| int type; |
| int attributes; |
| }; |
| |
| static struct special_section special_sections[] = |
| { |
| { ".bss", SHT_NOBITS, SHF_ALLOC + SHF_WRITE }, |
| { ".comment", SHT_PROGBITS, 0 }, |
| { ".data", SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, |
| { ".data1", SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, |
| { ".debug", SHT_PROGBITS, 0 }, |
| { ".fini", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR }, |
| { ".init", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR }, |
| { ".line", SHT_PROGBITS, 0 }, |
| { ".note", SHT_NOTE, 0 }, |
| { ".rodata", SHT_PROGBITS, SHF_ALLOC }, |
| { ".rodata1", SHT_PROGBITS, SHF_ALLOC }, |
| { ".text", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR }, |
| |
| #ifdef ELF_TC_SPECIAL_SECTIONS |
| ELF_TC_SPECIAL_SECTIONS |
| #endif |
| |
| #if 0 |
| /* The following section names are special, but they can not |
| reasonably appear in assembler code. Some of the attributes are |
| processor dependent. */ |
| { ".dynamic", SHT_DYNAMIC, SHF_ALLOC /* + SHF_WRITE */ }, |
| { ".dynstr", SHT_STRTAB, SHF_ALLOC }, |
| { ".dynsym", SHT_DYNSYM, SHF_ALLOC }, |
| { ".got", SHT_PROGBITS, 0 }, |
| { ".hash", SHT_HASH, SHF_ALLOC }, |
| { ".interp", SHT_PROGBITS, /* SHF_ALLOC */ }, |
| { ".plt", SHT_PROGBITS, 0 }, |
| { ".shstrtab",SHT_STRTAB, 0 }, |
| { ".strtab", SHT_STRTAB, /* SHF_ALLOC */ }, |
| { ".symtab", SHT_SYMTAB, /* SHF_ALLOC */ }, |
| #endif |
| |
| { NULL, 0, 0 } |
| }; |
| |
| void |
| obj_elf_section (xxx) |
| int xxx; |
| { |
| char *string; |
| int new_sec; |
| segT sec; |
| int type, attr; |
| int i; |
| flagword flags; |
| symbolS *secsym; |
| |
| #ifdef md_flush_pending_output |
| md_flush_pending_output (); |
| #endif |
| |
| if (flag_mri) |
| { |
| char mri_type; |
| |
| 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; |
| } |
| |
| /* Get name of section. */ |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer == '"') |
| { |
| string = demand_copy_C_string (&xxx); |
| if (string == NULL) |
| { |
| ignore_rest_of_line (); |
| return; |
| } |
| } |
| else |
| { |
| char *p = input_line_pointer; |
| char c; |
| while (0 == strchr ("\n\t,; ", *p)) |
| p++; |
| if (p == input_line_pointer) |
| { |
| as_warn (_("Missing section name")); |
| ignore_rest_of_line (); |
| return; |
| } |
| c = *p; |
| *p = 0; |
| string = xmalloc ((unsigned long) (p - input_line_pointer + 1)); |
| strcpy (string, input_line_pointer); |
| *p = c; |
| input_line_pointer = p; |
| } |
| |
| /* Switch to the section, creating it if necessary. */ |
| previous_section = now_seg; |
| previous_subsection = now_subseg; |
| |
| new_sec = bfd_get_section_by_name (stdoutput, string) == NULL; |
| sec = subseg_new (string, 0); |
| |
| /* If this section already existed, we don't bother to change the |
| flag values. */ |
| if (! new_sec) |
| { |
| while (! is_end_of_line[(unsigned char) *input_line_pointer]) |
| ++input_line_pointer; |
| ++input_line_pointer; |
| |
| #ifdef md_elf_section_change_hook |
| md_elf_section_change_hook (); |
| #endif |
| |
| return; |
| } |
| |
| SKIP_WHITESPACE (); |
| |
| type = SHT_NULL; |
| attr = 0; |
| |
| if (*input_line_pointer == ',') |
| { |
| /* Skip the comma. */ |
| ++input_line_pointer; |
| |
| SKIP_WHITESPACE (); |
| |
| if (*input_line_pointer == '"') |
| { |
| /* Pick up a string with a combination of a, w, x. */ |
| ++input_line_pointer; |
| while (*input_line_pointer != '"') |
| { |
| switch (*input_line_pointer) |
| { |
| case 'a': |
| attr |= SHF_ALLOC; |
| break; |
| case 'w': |
| attr |= SHF_WRITE; |
| break; |
| case 'x': |
| attr |= SHF_EXECINSTR; |
| break; |
| default: |
| { |
| char *bad_msg = _("Bad .section directive: want a,w,x in string"); |
| #ifdef md_elf_section_letter |
| int md_attr = md_elf_section_letter (*input_line_pointer, &bad_msg); |
| if (md_attr) |
| attr |= md_attr; |
| else |
| #endif |
| { |
| as_warn (bad_msg); |
| ignore_rest_of_line (); |
| return; |
| } |
| } |
| } |
| ++input_line_pointer; |
| } |
| |
| /* Skip the closing quote. */ |
| ++input_line_pointer; |
| |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer == ',') |
| { |
| ++input_line_pointer; |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer == '@' || *input_line_pointer == '%') |
| { |
| ++input_line_pointer; |
| if (strncmp (input_line_pointer, "progbits", |
| sizeof "progbits" - 1) == 0) |
| { |
| type = SHT_PROGBITS; |
| input_line_pointer += sizeof "progbits" - 1; |
| } |
| else if (strncmp (input_line_pointer, "nobits", |
| sizeof "nobits" - 1) == 0) |
| { |
| type = SHT_NOBITS; |
| input_line_pointer += sizeof "nobits" - 1; |
| } |
| else |
| { |
| #ifdef md_elf_section_type |
| int md_type = md_elf_section_type (&input_line_pointer); |
| if (md_type) |
| type = md_type; |
| else |
| #endif |
| { |
| as_warn (_("Unrecognized section type")); |
| ignore_rest_of_line (); |
| } |
| } |
| } |
| } |
| } |
| else |
| { |
| do |
| { |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer != '#') |
| { |
| as_warn (_("Bad .section directive - character following name is not '#'")); |
| ignore_rest_of_line (); |
| return; |
| } |
| ++input_line_pointer; |
| if (strncmp (input_line_pointer, "write", |
| sizeof "write" - 1) == 0) |
| { |
| attr |= SHF_WRITE; |
| input_line_pointer += sizeof "write" - 1; |
| } |
| else if (strncmp (input_line_pointer, "alloc", |
| sizeof "alloc" - 1) == 0) |
| { |
| attr |= SHF_ALLOC; |
| input_line_pointer += sizeof "alloc" - 1; |
| } |
| else if (strncmp (input_line_pointer, "execinstr", |
| sizeof "execinstr" - 1) == 0) |
| { |
| attr |= SHF_EXECINSTR; |
| input_line_pointer += sizeof "execinstr" - 1; |
| } |
| else |
| { |
| #ifdef md_elf_section_word |
| int md_attr = md_elf_section_word (&input_line_pointer); |
| if (md_attr) |
| attr |= md_attr; |
| else |
| #endif |
| { |
| as_warn (_("Unrecognized section attribute")); |
| ignore_rest_of_line (); |
| return; |
| } |
| } |
| SKIP_WHITESPACE (); |
| } |
| while (*input_line_pointer++ == ','); |
| --input_line_pointer; |
| } |
| } |
| |
| /* See if this is one of the special sections. */ |
| for (i = 0; special_sections[i].name != NULL; i++) |
| { |
| if (string[1] == special_sections[i].name[1] |
| && strcmp (string, special_sections[i].name) == 0) |
| { |
| if (type == SHT_NULL) |
| type = special_sections[i].type; |
| else if (type != special_sections[i].type) |
| as_warn (_("Setting incorrect section type for %s"), string); |
| |
| if ((attr &~ special_sections[i].attributes) != 0) |
| { |
| /* As a GNU extension, we permit a .note section to be |
| allocatable. If the linker sees an allocateable |
| .note section, it will create a PT_NOTE segment in |
| the output file. */ |
| if (strcmp (string, ".note") != 0 |
| || attr != SHF_ALLOC) |
| as_warn (_("Setting incorrect section attributes for %s"), |
| string); |
| } |
| attr |= special_sections[i].attributes; |
| |
| break; |
| } |
| } |
| |
| 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)); |
| if (special_sections[i].name == NULL) |
| { |
| if (type == SHT_PROGBITS) |
| flags |= SEC_ALLOC | SEC_LOAD; |
| else if (type == SHT_NOBITS) |
| { |
| flags |= SEC_ALLOC; |
| flags &=~ SEC_LOAD; |
| } |
| |
| #ifdef md_elf_section_flags |
| flags = md_elf_section_flags (flags, attr, type); |
| #endif |
| } |
| |
| /* Prevent SEC_HAS_CONTENTS from being inadvertently set. */ |
| if (type == SHT_NOBITS) |
| seg_info (sec)->bss = 1; |
| |
| bfd_set_section_flags (stdoutput, sec, flags); |
| |
| /* Add a symbol for this section to the symbol table. */ |
| secsym = symbol_find (string); |
| if (secsym != NULL) |
| secsym->bsym = sec->symbol; |
| else |
| symbol_table_insert (section_symbol (sec)); |
| |
| #ifdef md_elf_section_change_hook |
| md_elf_section_change_hook (); |
| #endif |
| |
| demand_empty_rest_of_line (); |
| } |
| |
| /* Change to the .data section. */ |
| |
| static void |
| obj_elf_data (i) |
| 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. */ |
| |
| static void |
| obj_elf_text (i) |
| 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 (ignore) |
| int ignore; |
| { |
| 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 () |
| { |
| previous_section = now_seg; |
| previous_subsection = now_subseg; |
| } |
| |
| void |
| obj_elf_previous (ignore) |
| int ignore; |
| { |
| if (previous_section == 0) |
| { |
| as_bad (_(".previous without corresponding .section; ignored")); |
| return; |
| } |
| |
| #ifdef md_flush_pending_output |
| md_flush_pending_output (); |
| #endif |
| |
| subseg_set (previous_section, previous_subsection); |
| previous_section = 0; |
| |
| #ifdef md_elf_section_change_hook |
| md_elf_section_change_hook (); |
| #endif |
| } |
| |
| static void |
| obj_elf_line (ignore) |
| int ignore; |
| { |
| /* Assume delimiter is part of expression. BSD4.2 as fails with |
| delightful bug, so we are not being incompatible here. */ |
| new_logical_line ((char *) NULL, (int) (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 (ignore) |
| int ignore; |
| { |
| char *name; |
| char c; |
| symbolS *sym; |
| |
| name = input_line_pointer; |
| c = get_symbol_end (); |
| |
| sym = symbol_find_or_make (name); |
| |
| *input_line_pointer = c; |
| |
| if (sym->sy_obj.versioned_name != NULL) |
| { |
| as_bad (_("multiple .symver directives for symbol `%s'"), |
| S_GET_NAME (sym)); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer != ',') |
| { |
| as_bad (_("expected comma after name in .symver")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| ++input_line_pointer; |
| name = input_line_pointer; |
| while (1) |
| { |
| c = get_symbol_end (); |
| if (c != ELF_VER_CHR) |
| break; |
| *input_line_pointer++ = c; |
| } |
| |
| sym->sy_obj.versioned_name = xstrdup (name); |
| |
| *input_line_pointer = c; |
| |
| if (strchr (sym->sy_obj.versioned_name, ELF_VER_CHR) == NULL) |
| { |
| as_bad (_("missing version name in `%s' for symbol `%s'"), |
| sym->sy_obj.versioned_name, S_GET_NAME (sym)); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| 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". */ |
| |
| static void |
| obj_elf_vtable_inherit (ignore) |
| { |
| 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 || csym->sy_frag == 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; |
| } |
| |
| ++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; |
| |
| assert (csym->sy_value.X_op == O_constant); |
| fix_new (csym->sy_frag, csym->sy_value.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". */ |
| |
| static void |
| obj_elf_vtable_entry (ignore) |
| { |
| 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; |
| } |
| |
| ++input_line_pointer; |
| if (*input_line_pointer == '#') |
| ++input_line_pointer; |
| |
| offset = get_absolute_expression (); |
| |
| fix_new (frag_now, frag_now_fix (), 0, sym, offset, 0, |
| BFD_RELOC_VTABLE_ENTRY); |
| |
| demand_empty_rest_of_line (); |
| } |
| |
| void |
| obj_read_begin_hook () |
| { |
| #ifdef NEED_ECOFF_DEBUG |
| if (ECOFF_DEBUGGING) |
| ecoff_read_begin_hook (); |
| #endif |
| } |
| |
| void |
| obj_symbol_new_hook (symbolP) |
| symbolS *symbolP; |
| { |
| symbolP->sy_obj.size = NULL; |
| symbolP->sy_obj.versioned_name = NULL; |
| |
| #ifdef NEED_ECOFF_DEBUG |
| if (ECOFF_DEBUGGING) |
| ecoff_symbol_new_hook (symbolP); |
| #endif |
| } |
| |
| void |
| obj_elf_version (ignore) |
| int ignore; |
| { |
| 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 = (asection *) NULL; |
| int i, 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, (valueT) i_note.namesz, 4); |
| p = frag_more (sizeof (e_note.descsz)); |
| md_number_to_chars (p, (valueT) i_note.descsz, 4); |
| p = frag_more (sizeof (e_note.type)); |
| md_number_to_chars (p, (valueT) i_note.type, 4); |
| |
| for (i = 0; i < len; i++) |
| { |
| ch = *(name + i); |
| { |
| FRAG_APPEND_1_CHAR (ch); |
| } |
| } |
| 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 (ignore) |
| int ignore; |
| { |
| 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); |
| else |
| { |
| sym->sy_obj.size = (expressionS *) xmalloc (sizeof (expressionS)); |
| *sym->sy_obj.size = exp; |
| } |
| demand_empty_rest_of_line (); |
| } |
| |
| /* Handle the ELF .type pseudo-op. This sets the type of a symbol. |
| There are four 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 |
| */ |
| |
| static void |
| obj_elf_type (ignore) |
| int ignore; |
| { |
| char *name; |
| char c; |
| int type; |
| const char *typename; |
| 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 == ',') |
| ++input_line_pointer; |
| |
| SKIP_WHITESPACE (); |
| if ( *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 |
| as_bad (_("ignoring unrecognized symbol type \"%s\""), typename); |
| |
| *input_line_pointer = c; |
| |
| sym->bsym->flags |= type; |
| |
| demand_empty_rest_of_line (); |
| } |
| |
| static void |
| obj_elf_ident (ignore) |
| int ignore; |
| { |
| static segT comment_section; |
| segT old_section = now_seg; |
| int old_subsection = now_subseg; |
| |
| 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 (seg) |
| 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, (unsigned int *) NULL); |
| stabstr_name = (char *) alloca (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 (abfd, sec, xxx) |
| bfd *abfd; |
| asection *sec; |
| PTR xxx; |
| { |
| 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 = (char *) 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, (bfd_vma) nsyms, (bfd_byte *) p + 6); |
| bfd_h_put_32 (abfd, (bfd_vma) strsz, (bfd_byte *) 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 (sym, ext) |
| symbolS *sym; |
| struct ecoff_extr *ext; |
| { |
| sym->bsym->udata.p = (PTR) 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 boolean |
| elf_get_extr (sym, ext) |
| 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. */ |
| |
| /*ARGSUSED*/ |
| static void |
| elf_set_index (sym, indx) |
| asymbol *sym; |
| bfd_size_type indx; |
| { |
| } |
| |
| #endif /* NEED_ECOFF_DEBUG */ |
| |
| void |
| elf_frob_symbol (symp, puntp) |
| symbolS *symp; |
| int *puntp; |
| { |
| #ifdef NEED_ECOFF_DEBUG |
| if (ECOFF_DEBUGGING) |
| ecoff_frob_symbol (symp); |
| #endif |
| |
| if (symp->sy_obj.size != NULL) |
| { |
| switch (symp->sy_obj.size->X_op) |
| { |
| case O_subtract: |
| S_SET_SIZE (symp, |
| (S_GET_VALUE (symp->sy_obj.size->X_add_symbol) |
| + symp->sy_obj.size->X_add_number |
| - S_GET_VALUE (symp->sy_obj.size->X_op_symbol))); |
| break; |
| case O_constant: |
| S_SET_SIZE (symp, |
| (S_GET_VALUE (symp->sy_obj.size->X_add_symbol) |
| + symp->sy_obj.size->X_add_number)); |
| break; |
| default: |
| as_bad (_(".size expression too complicated to fix up")); |
| break; |
| } |
| free (symp->sy_obj.size); |
| symp->sy_obj.size = NULL; |
| } |
| |
| if (symp->sy_obj.versioned_name != 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)) |
| { |
| char *p; |
| |
| /* Verify that the name isn't using the @@ syntax--this is |
| reserved for definitions of the default version to link |
| against. */ |
| p = strchr (symp->sy_obj.versioned_name, ELF_VER_CHR); |
| know (p != NULL); |
| if (p[1] == ELF_VER_CHR) |
| { |
| as_bad (_("invalid attempt to declare external version name as default in symbol `%s'"), |
| symp->sy_obj.versioned_name); |
| *puntp = true; |
| } |
| S_SET_NAME (symp, 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 (symp->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) - symp->sy_frag->fr_address); |
| |
| symp2->sy_frag = symp->sy_frag; |
| |
| /* This will copy over the size information. */ |
| copy_symbol_attributes (symp2, symp); |
| |
| if (S_IS_WEAK (symp)) |
| S_SET_WEAK (symp2); |
| |
| if (S_IS_EXTERNAL (symp)) |
| S_SET_EXTERNAL (symp2); |
| } |
| } |
| |
| /* Double check weak symbols. */ |
| if (symp->bsym->flags & BSF_WEAK) |
| { |
| 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)) |
| symp->bsym->flags |= BSF_OBJECT; |
| |
| if (strstr (TARGET_OS, "irix") != NULL |
| && (! S_IS_DEFINED (symp) && ((symp->bsym->flags & BSF_FUNCTION) == 0))) |
| symp->bsym->flags |= BSF_OBJECT; |
| #endif |
| |
| #ifdef TC_PPC |
| /* Frob the PowerPC, so that the symbol always has object type |
| if it is not some other type. VxWorks needs this. */ |
| if ((symp->bsym->flags & (BSF_FUNCTION | BSF_FILE | BSF_SECTION_SYM)) == 0 |
| && S_IS_DEFINED (symp)) |
| symp->bsym->flags |= BSF_OBJECT; |
| #endif |
| } |
| |
| void |
| elf_frob_file () |
| { |
| bfd_map_over_sections (stdoutput, adjust_stab_sections, (PTR) 0); |
| |
| #ifdef elf_tc_final_processing |
| elf_tc_final_processing (); |
| #endif |
| } |
| |
| /* 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 () |
| { |
| #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 != (const struct ecoff_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, PTR); |
| SET (external_pdr, cbPdOffset, PTR); |
| SET (external_sym, cbSymOffset, PTR); |
| SET (external_opt, cbOptOffset, PTR); |
| SET (external_aux, cbAuxOffset, union aux_ext *); |
| SET (ss, cbSsOffset, char *); |
| SET (external_fdr, cbFdOffset, PTR); |
| SET (external_rfd, cbRfdOffset, PTR); |
| /* 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 == false); |
| |
| /* 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? */ |
| sec->_raw_size = bfd_ecoff_debug_size (stdoutput, &debug, debug_swap); |
| |
| if (! bfd_set_section_contents (stdoutput, sec, (PTR) NULL, |
| (file_ptr) 0, (bfd_size_type) 0)) |
| as_fatal (_("Can't start writing .mdebug section: %s"), |
| bfd_errmsg (bfd_get_error ())); |
| |
| know (stdoutput->output_has_begun == true); |
| 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 plagarized 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 () |
| { |
| |
| 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 = (asection *) 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, (valueT) i_note.namesz, 4); |
| |
| p = frag_more (sizeof (i_note.descsz)); |
| md_number_to_chars (p, (valueT) i_note.descsz, 4); |
| |
| p = frag_more (sizeof (i_note.type)); |
| md_number_to_chars (p, (valueT) 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 */ |
| |
| const struct format_ops elf_format_ops = |
| { |
| bfd_target_elf_flavour, |
| 0, |
| 1, |
| elf_frob_symbol, |
| elf_frob_file, |
| elf_frob_file_after_relocs, |
| elf_s_get_size, elf_s_set_size, |
| elf_s_get_align, elf_s_set_align, |
| elf_copy_symbol_attributes, |
| #ifdef NEED_ECOFF_DEBUG |
| ecoff_generate_asm_lineno, |
| ecoff_stab, |
| #else |
| 0, |
| 0, /* process_stab */ |
| #endif |
| elf_sec_sym_ok_for_reloc, |
| elf_pop_insert, |
| #ifdef NEED_ECOFF_DEBUG |
| elf_ecoff_set_ext, |
| #else |
| 0, |
| #endif |
| obj_read_begin_hook, |
| obj_symbol_new_hook, |
| }; |