mirror of
https://github.com/autc04/Retro68.git
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2739 lines
67 KiB
C
2739 lines
67 KiB
C
/* ELF object file format
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Copyright (C) 1992-2017 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 3,
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or (at your option) any later version.
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GAS is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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#define OBJ_HEADER "obj-elf.h"
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#include "as.h"
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#include "safe-ctype.h"
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#include "subsegs.h"
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#include "obstack.h"
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#include "struc-symbol.h"
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#include "dwarf2dbg.h"
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#ifndef ECOFF_DEBUGGING
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#define ECOFF_DEBUGGING 0
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#else
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#define NEED_ECOFF_DEBUG
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#endif
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#ifdef NEED_ECOFF_DEBUG
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#include "ecoff.h"
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#endif
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#ifdef TC_ALPHA
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#include "elf/alpha.h"
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#endif
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#ifdef TC_MIPS
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#include "elf/mips.h"
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#endif
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#ifdef TC_PPC
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#include "elf/ppc.h"
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#endif
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#ifdef TC_I370
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#include "elf/i370.h"
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#endif
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#ifdef TC_I386
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#include "elf/x86-64.h"
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#endif
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#ifdef TC_MEP
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#include "elf/mep.h"
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#endif
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#ifdef TC_NIOS2
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#include "elf/nios2.h"
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#endif
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static void obj_elf_line (int);
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static void obj_elf_size (int);
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static void obj_elf_type (int);
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static void obj_elf_ident (int);
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static void obj_elf_weak (int);
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static void obj_elf_local (int);
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static void obj_elf_visibility (int);
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static void obj_elf_symver (int);
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static void obj_elf_subsection (int);
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static void obj_elf_popsection (int);
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static void obj_elf_gnu_attribute (int);
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static void obj_elf_tls_common (int);
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static void obj_elf_lcomm (int);
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static void obj_elf_struct (int);
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static const pseudo_typeS elf_pseudo_table[] =
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{
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{"comm", obj_elf_common, 0},
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{"common", obj_elf_common, 1},
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{"ident", obj_elf_ident, 0},
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{"lcomm", obj_elf_lcomm, 0},
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{"local", obj_elf_local, 0},
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{"previous", obj_elf_previous, 0},
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{"section", obj_elf_section, 0},
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{"section.s", obj_elf_section, 0},
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{"sect", obj_elf_section, 0},
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{"sect.s", obj_elf_section, 0},
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{"pushsection", obj_elf_section, 1},
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{"popsection", obj_elf_popsection, 0},
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{"size", obj_elf_size, 0},
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{"type", obj_elf_type, 0},
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{"version", obj_elf_version, 0},
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{"weak", obj_elf_weak, 0},
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/* These define symbol visibility. */
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{"internal", obj_elf_visibility, STV_INTERNAL},
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{"hidden", obj_elf_visibility, STV_HIDDEN},
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{"protected", obj_elf_visibility, STV_PROTECTED},
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/* These are used for stabs-in-elf configurations. */
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{"line", obj_elf_line, 0},
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/* This is a GNU extension to handle symbol versions. */
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{"symver", obj_elf_symver, 0},
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/* A GNU extension to change subsection only. */
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{"subsection", obj_elf_subsection, 0},
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/* These are GNU extensions to aid in garbage collecting C++ vtables. */
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{"vtable_inherit", (void (*) (int)) &obj_elf_vtable_inherit, 0},
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{"vtable_entry", (void (*) (int)) &obj_elf_vtable_entry, 0},
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/* A GNU extension for object attributes. */
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{"gnu_attribute", obj_elf_gnu_attribute, 0},
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/* These are used for dwarf. */
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{"2byte", cons, 2},
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{"4byte", cons, 4},
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{"8byte", cons, 8},
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/* These are used for dwarf2. */
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{ "file", (void (*) (int)) dwarf2_directive_file, 0 },
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{ "loc", dwarf2_directive_loc, 0 },
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{ "loc_mark_labels", dwarf2_directive_loc_mark_labels, 0 },
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/* We need to trap the section changing calls to handle .previous. */
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{"data", obj_elf_data, 0},
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{"offset", obj_elf_struct, 0},
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{"struct", obj_elf_struct, 0},
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{"text", obj_elf_text, 0},
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{"tls_common", obj_elf_tls_common, 0},
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/* End sentinel. */
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{NULL, NULL, 0},
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};
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static const pseudo_typeS ecoff_debug_pseudo_table[] =
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{
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#ifdef NEED_ECOFF_DEBUG
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/* COFF style debugging information for ECOFF. .ln is not used; .loc
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is used instead. */
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{ "def", ecoff_directive_def, 0 },
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{ "dim", ecoff_directive_dim, 0 },
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{ "endef", ecoff_directive_endef, 0 },
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{ "file", ecoff_directive_file, 0 },
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{ "scl", ecoff_directive_scl, 0 },
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{ "tag", ecoff_directive_tag, 0 },
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{ "val", ecoff_directive_val, 0 },
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/* COFF debugging requires pseudo-ops .size and .type, but ELF
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already has meanings for those. We use .esize and .etype
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instead. These are only generated by gcc anyhow. */
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{ "esize", ecoff_directive_size, 0 },
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{ "etype", ecoff_directive_type, 0 },
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/* ECOFF specific debugging information. */
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{ "begin", ecoff_directive_begin, 0 },
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{ "bend", ecoff_directive_bend, 0 },
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{ "end", ecoff_directive_end, 0 },
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{ "ent", ecoff_directive_ent, 0 },
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{ "fmask", ecoff_directive_fmask, 0 },
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{ "frame", ecoff_directive_frame, 0 },
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{ "loc", ecoff_directive_loc, 0 },
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{ "mask", ecoff_directive_mask, 0 },
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/* Other ECOFF directives. */
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{ "extern", ecoff_directive_extern, 0 },
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/* These are used on Irix. I don't know how to implement them. */
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{ "alias", s_ignore, 0 },
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{ "bgnb", s_ignore, 0 },
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{ "endb", s_ignore, 0 },
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{ "lab", s_ignore, 0 },
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{ "noalias", s_ignore, 0 },
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{ "verstamp", s_ignore, 0 },
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{ "vreg", s_ignore, 0 },
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#endif
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{NULL, NULL, 0} /* end sentinel */
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};
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#undef NO_RELOC
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#include "aout/aout64.h"
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/* This is called when the assembler starts. */
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asection *elf_com_section_ptr;
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void
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elf_begin (void)
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{
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asection *s;
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/* Add symbols for the known sections to the symbol table. */
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s = bfd_get_section_by_name (stdoutput, TEXT_SECTION_NAME);
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symbol_table_insert (section_symbol (s));
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s = bfd_get_section_by_name (stdoutput, DATA_SECTION_NAME);
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symbol_table_insert (section_symbol (s));
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s = bfd_get_section_by_name (stdoutput, BSS_SECTION_NAME);
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symbol_table_insert (section_symbol (s));
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elf_com_section_ptr = bfd_com_section_ptr;
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}
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void
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elf_pop_insert (void)
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{
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pop_insert (elf_pseudo_table);
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if (ECOFF_DEBUGGING)
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pop_insert (ecoff_debug_pseudo_table);
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}
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static bfd_vma
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elf_s_get_size (symbolS *sym)
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{
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return S_GET_SIZE (sym);
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}
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static void
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elf_s_set_size (symbolS *sym, bfd_vma sz)
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{
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S_SET_SIZE (sym, sz);
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}
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static bfd_vma
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elf_s_get_align (symbolS *sym)
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{
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return S_GET_ALIGN (sym);
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}
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static void
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elf_s_set_align (symbolS *sym, bfd_vma align)
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{
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S_SET_ALIGN (sym, align);
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}
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int
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elf_s_get_other (symbolS *sym)
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{
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return elf_symbol (symbol_get_bfdsym (sym))->internal_elf_sym.st_other;
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}
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static void
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elf_s_set_other (symbolS *sym, int other)
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{
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S_SET_OTHER (sym, other);
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}
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static int
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elf_sec_sym_ok_for_reloc (asection *sec)
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{
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return obj_sec_sym_ok_for_reloc (sec);
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}
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void
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elf_file_symbol (const char *s, int appfile)
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{
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if (!appfile
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|| symbol_rootP == NULL
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|| symbol_rootP->bsym == NULL
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|| (symbol_rootP->bsym->flags & BSF_FILE) == 0)
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{
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symbolS *sym;
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size_t name_length;
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sym = symbol_new (s, absolute_section, 0, NULL);
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symbol_set_frag (sym, &zero_address_frag);
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name_length = strlen (s);
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if (name_length > strlen (S_GET_NAME (sym)))
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{
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obstack_grow (¬es, s, name_length + 1);
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S_SET_NAME (sym, (const char *) obstack_finish (¬es));
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}
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else
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strcpy ((char *) S_GET_NAME (sym), s);
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symbol_get_bfdsym (sym)->flags |= BSF_FILE;
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if (symbol_rootP != sym
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&& (symbol_rootP->bsym == NULL
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|| !(symbol_rootP->bsym->flags & BSF_FILE)))
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{
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symbol_remove (sym, &symbol_rootP, &symbol_lastP);
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symbol_insert (sym, symbol_rootP, &symbol_rootP, &symbol_lastP);
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}
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#ifdef DEBUG
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verify_symbol_chain (symbol_rootP, symbol_lastP);
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#endif
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}
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#ifdef NEED_ECOFF_DEBUG
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ecoff_new_file (s, appfile);
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#endif
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}
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/* Called from read.c:s_comm after we've parsed .comm symbol, size.
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Parse a possible alignment value. */
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symbolS *
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elf_common_parse (int ignore ATTRIBUTE_UNUSED, symbolS *symbolP, addressT size)
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{
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addressT align = 0;
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int is_local = symbol_get_obj (symbolP)->local;
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if (*input_line_pointer == ',')
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{
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char *save = input_line_pointer;
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input_line_pointer++;
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SKIP_WHITESPACE ();
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if (*input_line_pointer == '"')
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{
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/* For sparc. Accept .common symbol, length, "bss" */
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input_line_pointer++;
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/* Some use the dot, some don't. */
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if (*input_line_pointer == '.')
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input_line_pointer++;
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/* Some say data, some say bss. */
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if (strncmp (input_line_pointer, "bss\"", 4) == 0)
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input_line_pointer += 4;
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else if (strncmp (input_line_pointer, "data\"", 5) == 0)
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input_line_pointer += 5;
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else
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{
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char *p = input_line_pointer;
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char c;
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while (*--p != '"')
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;
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while (!is_end_of_line[(unsigned char) *input_line_pointer])
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if (*input_line_pointer++ == '"')
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break;
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c = *input_line_pointer;
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*input_line_pointer = '\0';
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as_bad (_("bad .common segment %s"), p);
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*input_line_pointer = c;
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ignore_rest_of_line ();
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return NULL;
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}
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/* ??? Don't ask me why these are always global. */
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is_local = 0;
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}
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else
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{
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input_line_pointer = save;
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align = parse_align (is_local);
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if (align == (addressT) -1)
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return NULL;
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}
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}
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if (is_local)
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{
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bss_alloc (symbolP, size, align);
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S_CLEAR_EXTERNAL (symbolP);
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}
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else
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{
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S_SET_VALUE (symbolP, size);
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S_SET_ALIGN (symbolP, align);
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S_SET_EXTERNAL (symbolP);
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S_SET_SEGMENT (symbolP, elf_com_section_ptr);
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}
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symbol_get_bfdsym (symbolP)->flags |= BSF_OBJECT;
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return symbolP;
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}
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void
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obj_elf_common (int is_common)
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{
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if (flag_mri && is_common)
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s_mri_common (0);
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else
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s_comm_internal (0, elf_common_parse);
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}
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static void
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obj_elf_tls_common (int ignore ATTRIBUTE_UNUSED)
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{
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symbolS *symbolP = s_comm_internal (0, elf_common_parse);
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if (symbolP)
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symbol_get_bfdsym (symbolP)->flags |= BSF_THREAD_LOCAL;
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}
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static void
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obj_elf_lcomm (int ignore ATTRIBUTE_UNUSED)
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{
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symbolS *symbolP = s_comm_internal (0, s_lcomm_internal);
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if (symbolP)
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symbol_get_bfdsym (symbolP)->flags |= BSF_OBJECT;
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}
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static symbolS *
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get_sym_from_input_line_and_check (void)
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{
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char *name;
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char c;
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symbolS *sym;
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c = get_symbol_name (& name);
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sym = symbol_find_or_make (name);
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*input_line_pointer = c;
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SKIP_WHITESPACE_AFTER_NAME ();
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/* There is no symbol name if input_line_pointer has not moved. */
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if (name == input_line_pointer)
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as_bad (_("Missing symbol name in directive"));
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return sym;
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}
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static void
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obj_elf_local (int ignore ATTRIBUTE_UNUSED)
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{
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int c;
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symbolS *symbolP;
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do
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{
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symbolP = get_sym_from_input_line_and_check ();
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c = *input_line_pointer;
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S_CLEAR_EXTERNAL (symbolP);
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symbol_get_obj (symbolP)->local = 1;
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if (c == ',')
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{
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input_line_pointer++;
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SKIP_WHITESPACE ();
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if (*input_line_pointer == '\n')
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c = '\n';
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}
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}
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while (c == ',');
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demand_empty_rest_of_line ();
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}
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static void
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obj_elf_weak (int ignore ATTRIBUTE_UNUSED)
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{
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int c;
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symbolS *symbolP;
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do
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{
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symbolP = get_sym_from_input_line_and_check ();
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c = *input_line_pointer;
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S_SET_WEAK (symbolP);
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if (c == ',')
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{
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input_line_pointer++;
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SKIP_WHITESPACE ();
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if (*input_line_pointer == '\n')
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c = '\n';
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}
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}
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while (c == ',');
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demand_empty_rest_of_line ();
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}
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static void
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obj_elf_visibility (int visibility)
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{
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int c;
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symbolS *symbolP;
|
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asymbol *bfdsym;
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elf_symbol_type *elfsym;
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do
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{
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symbolP = get_sym_from_input_line_and_check ();
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bfdsym = symbol_get_bfdsym (symbolP);
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elfsym = elf_symbol_from (bfd_asymbol_bfd (bfdsym), bfdsym);
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gas_assert (elfsym);
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elfsym->internal_elf_sym.st_other &= ~3;
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elfsym->internal_elf_sym.st_other |= visibility;
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c = *input_line_pointer;
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if (c == ',')
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{
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input_line_pointer ++;
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SKIP_WHITESPACE ();
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if (*input_line_pointer == '\n')
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c = '\n';
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}
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}
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|
while (c == ',');
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demand_empty_rest_of_line ();
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}
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|
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static segT previous_section;
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static int previous_subsection;
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|
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struct section_stack
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{
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struct section_stack *next;
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segT seg, prev_seg;
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int subseg, prev_subseg;
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};
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static struct section_stack *section_stack;
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static bfd_boolean
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get_section (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf)
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|
{
|
|
const char *gname = (const char *) inf;
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const char *group_name = elf_group_name (sec);
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return (group_name == gname
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|| (group_name != NULL
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&& gname != NULL
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&& strcmp (group_name, gname) == 0));
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}
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/* Handle the .section pseudo-op. This code supports two different
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syntaxes.
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The first is found on Solaris, and looks like
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.section ".sec1",#alloc,#execinstr,#write
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|
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
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|
doesn't really give us control over the type, anyhow).
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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,
|
|
unsigned int type,
|
|
bfd_vma attr,
|
|
int entsize,
|
|
const char *group_name,
|
|
int linkonce,
|
|
int push)
|
|
{
|
|
asection *old_sec;
|
|
segT sec;
|
|
flagword flags;
|
|
const struct elf_backend_data *bed;
|
|
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 = XNEW (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);
|
|
|
|
bed = get_elf_backend_data (stdoutput);
|
|
ssect = (*bed->get_sec_type_attr) (stdoutput, sec);
|
|
|
|
if (ssect != NULL)
|
|
{
|
|
bfd_boolean override = FALSE;
|
|
|
|
if (type == SHT_NULL)
|
|
type = ssect->type;
|
|
else if (type != ssect->type)
|
|
{
|
|
if (old_sec == NULL
|
|
/* Some older versions of gcc will emit
|
|
|
|
.section .init_array,"aw",@progbits
|
|
|
|
for __attribute__ ((section (".init_array"))).
|
|
"@progbits" is incorrect. Also for x86-64 large bss
|
|
sections, some older versions of gcc will emit
|
|
|
|
.section .lbss,"aw",@progbits
|
|
|
|
"@progbits" is incorrect. */
|
|
#ifdef TC_I386
|
|
&& (bed->s->arch_size != 64
|
|
|| !(ssect->attr & SHF_X86_64_LARGE))
|
|
#endif
|
|
&& 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
|
|
/* Processor and application defined types are allowed too. */
|
|
&& type < SHT_LOPROC)
|
|
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 & ~(SHF_MASKOS | SHF_MASKPROC))
|
|
& ~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;
|
|
#ifdef TC_ALPHA
|
|
/* A section on Alpha may have SHF_ALPHA_GPREL. */
|
|
else if ((attr & ~ssect->attr) == SHF_ALPHA_GPREL)
|
|
override = TRUE;
|
|
#endif
|
|
#ifdef TC_RX
|
|
else if (attr == (SHF_EXECINSTR | SHF_WRITE | SHF_ALLOC)
|
|
&& (ssect->type == SHT_INIT_ARRAY
|
|
|| ssect->type == SHT_FINI_ARRAY
|
|
|| ssect->type == SHT_PREINIT_ARRAY))
|
|
/* RX init/fini arrays can and should have the "awx" attributes set. */
|
|
;
|
|
#endif
|
|
else
|
|
{
|
|
if (group_name == NULL)
|
|
as_warn (_("setting incorrect section attributes for %s"),
|
|
name);
|
|
override = TRUE;
|
|
}
|
|
}
|
|
|
|
if (!override && old_sec == NULL)
|
|
attr |= ssect->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_EXCLUDE) ? SEC_EXCLUDE: 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;
|
|
|
|
if (type == SHT_NULL)
|
|
type = bfd_elf_get_default_section_type (flags);
|
|
elf_section_type (sec) = type;
|
|
elf_section_flags (sec) = attr;
|
|
|
|
/* 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 (type != SHT_NULL
|
|
&& (unsigned) type != elf_section_type (old_sec))
|
|
as_warn (_("ignoring changed section type for %s"), name);
|
|
|
|
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);
|
|
else
|
|
/* FIXME: Maybe we should consider removing a previously set
|
|
processor or application specific attribute as suspicious ? */
|
|
elf_section_flags (sec) = attr;
|
|
|
|
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 bfd_vma
|
|
obj_elf_parse_section_letters (char *str, size_t len, bfd_boolean *is_clone)
|
|
{
|
|
bfd_vma attr = 0;
|
|
*is_clone = FALSE;
|
|
|
|
while (len > 0)
|
|
{
|
|
switch (*str)
|
|
{
|
|
case 'a':
|
|
attr |= SHF_ALLOC;
|
|
break;
|
|
case 'e':
|
|
attr |= SHF_EXCLUDE;
|
|
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;
|
|
case '?':
|
|
*is_clone = TRUE;
|
|
break;
|
|
/* Compatibility. */
|
|
case 'm':
|
|
if (*(str - 1) == 'a')
|
|
{
|
|
attr |= SHF_MERGE;
|
|
if (len > 1 && str[1] == 's')
|
|
{
|
|
attr |= SHF_STRINGS;
|
|
str++, len--;
|
|
}
|
|
break;
|
|
}
|
|
/* Fall through. */
|
|
default:
|
|
{
|
|
const char *bad_msg = _("unrecognized .section attribute:"
|
|
" want a,e,w,x,M,S,G,T or number");
|
|
#ifdef md_elf_section_letter
|
|
bfd_vma md_attr = md_elf_section_letter (*str, &bad_msg);
|
|
if (md_attr != (bfd_vma) -1)
|
|
attr |= md_attr;
|
|
else
|
|
#endif
|
|
if (ISDIGIT (*str))
|
|
{
|
|
char * end;
|
|
|
|
attr |= strtoul (str, & end, 0);
|
|
/* Update str and len, allowing for the fact that
|
|
we will execute str++ and len-- below. */
|
|
end --;
|
|
len -= (end - str);
|
|
str = end;
|
|
}
|
|
else
|
|
as_fatal ("%s", bad_msg);
|
|
}
|
|
break;
|
|
}
|
|
str++, len--;
|
|
}
|
|
|
|
return attr;
|
|
}
|
|
|
|
static int
|
|
obj_elf_section_type (char *str, size_t len, bfd_boolean warn)
|
|
{
|
|
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
|
|
|
|
if (ISDIGIT (*str))
|
|
{
|
|
char * end;
|
|
int type = strtoul (str, & end, 0);
|
|
|
|
if (warn && (size_t) (end - str) != len)
|
|
as_warn (_("extraneous characters at end of numeric section type"));
|
|
|
|
return type;
|
|
}
|
|
|
|
if (warn)
|
|
as_warn (_("unrecognized section type"));
|
|
return 0;
|
|
}
|
|
|
|
static bfd_vma
|
|
obj_elf_section_word (char *str, size_t len, int *type)
|
|
{
|
|
int ret;
|
|
|
|
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 == 7 && strncmp (str, "exclude", 7) == 0)
|
|
return SHF_EXCLUDE;
|
|
if (len == 3 && strncmp (str, "tls", 3) == 0)
|
|
return SHF_TLS;
|
|
|
|
#ifdef md_elf_section_word
|
|
{
|
|
bfd_vma md_attr = md_elf_section_word (str, len);
|
|
if (md_attr > 0)
|
|
return md_attr;
|
|
}
|
|
#endif
|
|
|
|
ret = obj_elf_section_type (str, len, FALSE);
|
|
if (ret != 0)
|
|
*type = ret;
|
|
else
|
|
as_warn (_("unrecognized section attribute"));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Get name of section. */
|
|
const 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 = xmemdup0 (input_line_pointer, end - input_line_pointer);
|
|
|
|
while (flag_sectname_subst)
|
|
{
|
|
char *subst = strchr (name, '%');
|
|
if (subst && subst[1] == 'S')
|
|
{
|
|
int oldlen = strlen (name);
|
|
int substlen = strlen (now_seg->name);
|
|
int newlen = oldlen - 2 + substlen;
|
|
char *newname = XNEWVEC (char, newlen + 1);
|
|
int headlen = subst - name;
|
|
memcpy (newname, name, headlen);
|
|
strcpy (newname + headlen, now_seg->name);
|
|
strcat (newname + headlen, subst + 2);
|
|
xfree (name);
|
|
name = newname;
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
|
|
#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)
|
|
{
|
|
const char *name, *group_name;
|
|
char *beg;
|
|
int type, dummy;
|
|
bfd_vma attr;
|
|
int entsize;
|
|
int linkonce;
|
|
subsegT new_subsection = -1;
|
|
|
|
#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 (push && ISDIGIT (*input_line_pointer))
|
|
{
|
|
/* .pushsection has an optional subsection. */
|
|
new_subsection = (subsegT) get_absolute_expression ();
|
|
|
|
SKIP_WHITESPACE ();
|
|
|
|
/* Stop if we don't see a comma. */
|
|
if (*input_line_pointer != ',')
|
|
goto done;
|
|
|
|
/* Skip the comma. */
|
|
++input_line_pointer;
|
|
SKIP_WHITESPACE ();
|
|
}
|
|
|
|
if (*input_line_pointer == '"')
|
|
{
|
|
bfd_boolean is_clone;
|
|
|
|
beg = demand_copy_C_string (&dummy);
|
|
if (beg == NULL)
|
|
{
|
|
ignore_rest_of_line ();
|
|
return;
|
|
}
|
|
attr |= obj_elf_parse_section_letters (beg, strlen (beg), &is_clone);
|
|
|
|
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), TRUE);
|
|
}
|
|
else if (c == '@' || c == '%')
|
|
{
|
|
++input_line_pointer;
|
|
|
|
if (ISDIGIT (* input_line_pointer))
|
|
{
|
|
type = strtoul (input_line_pointer, & input_line_pointer, 0);
|
|
}
|
|
else
|
|
{
|
|
c = get_symbol_name (& beg);
|
|
(void) restore_line_pointer (c);
|
|
type = obj_elf_section_type (beg, input_line_pointer - beg, TRUE);
|
|
}
|
|
}
|
|
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 && is_clone)
|
|
{
|
|
as_warn (_("? section flag ignored with G present"));
|
|
is_clone = FALSE;
|
|
}
|
|
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 (*input_line_pointer == ',')
|
|
{
|
|
++input_line_pointer;
|
|
SKIP_WHITESPACE ();
|
|
if (strncmp (input_line_pointer, "comdat", 6) == 0)
|
|
{
|
|
input_line_pointer += 6;
|
|
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;
|
|
}
|
|
|
|
if (is_clone)
|
|
{
|
|
const char *now_group = elf_group_name (now_seg);
|
|
if (now_group != NULL)
|
|
{
|
|
group_name = xstrdup (now_group);
|
|
linkonce = (now_seg->flags & SEC_LINK_ONCE) != 0;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
do
|
|
{
|
|
char c;
|
|
|
|
SKIP_WHITESPACE ();
|
|
if (*input_line_pointer != '#')
|
|
{
|
|
as_bad (_("character following name is not '#'"));
|
|
ignore_rest_of_line ();
|
|
return;
|
|
}
|
|
++input_line_pointer;
|
|
c = get_symbol_name (& beg);
|
|
(void) restore_line_pointer (c);
|
|
|
|
attr |= obj_elf_section_word (beg, input_line_pointer - beg, & type);
|
|
|
|
SKIP_WHITESPACE ();
|
|
}
|
|
while (*input_line_pointer++ == ',');
|
|
--input_line_pointer;
|
|
}
|
|
}
|
|
|
|
done:
|
|
demand_empty_rest_of_line ();
|
|
|
|
obj_elf_change_section (name, type, attr, entsize, group_name, linkonce, push);
|
|
|
|
if (push && new_subsection != -1)
|
|
subseg_set (now_seg, new_subsection);
|
|
}
|
|
|
|
/* 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
|
|
}
|
|
|
|
/* Change to the *ABS* section. */
|
|
|
|
void
|
|
obj_elf_struct (int i)
|
|
{
|
|
#ifdef md_flush_pending_output
|
|
md_flush_pending_output ();
|
|
#endif
|
|
|
|
previous_section = now_seg;
|
|
previous_subsection = now_subseg;
|
|
s_struct (i);
|
|
|
|
#ifdef md_elf_section_change_hook
|
|
md_elf_section_change_hook ();
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
obj_elf_subsection (int ignore ATTRIBUTE_UNUSED)
|
|
{
|
|
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;
|
|
|
|
sym = get_sym_from_input_line_and_check ();
|
|
|
|
if (*input_line_pointer != ',')
|
|
{
|
|
as_bad (_("expected comma after name in .symver"));
|
|
ignore_rest_of_line ();
|
|
return;
|
|
}
|
|
|
|
++input_line_pointer;
|
|
SKIP_WHITESPACE ();
|
|
|
|
/* Temporarily include '@' in symbol names. */
|
|
old_lexat = lex_type[(unsigned char) '@'];
|
|
lex_type[(unsigned char) '@'] |= LEX_NAME;
|
|
c = get_symbol_name (& name);
|
|
lex_type[(unsigned char) '@'] = old_lexat;
|
|
|
|
if (symbol_get_obj (sym)->versioned_name == NULL)
|
|
{
|
|
symbol_get_obj (sym)->versioned_name = xstrdup (name);
|
|
|
|
(void) restore_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;
|
|
}
|
|
|
|
(void) restore_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;
|
|
|
|
c = get_symbol_name (& cname);
|
|
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_AFTER_NAME ();
|
|
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
|
|
{
|
|
c = get_symbol_name (& pname);
|
|
psym = symbol_find_or_make (pname);
|
|
restore_line_pointer (c);
|
|
}
|
|
|
|
demand_empty_rest_of_line ();
|
|
|
|
if (bad)
|
|
return NULL;
|
|
|
|
gas_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)
|
|
{
|
|
symbolS *sym;
|
|
offsetT offset;
|
|
|
|
if (*input_line_pointer == '#')
|
|
++input_line_pointer;
|
|
|
|
sym = get_sym_from_input_line_and_check ();
|
|
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);
|
|
}
|
|
|
|
#define skip_whitespace(str) do { if (*(str) == ' ') ++(str); } while (0)
|
|
|
|
static inline int
|
|
skip_past_char (char ** str, char c)
|
|
{
|
|
if (**str == c)
|
|
{
|
|
(*str)++;
|
|
return 0;
|
|
}
|
|
else
|
|
return -1;
|
|
}
|
|
#define skip_past_comma(str) skip_past_char (str, ',')
|
|
|
|
/* A list of attributes that have been explicitly set by the assembly code.
|
|
VENDOR is the vendor id, BASE is the tag shifted right by the number
|
|
of bits in MASK, and bit N of MASK is set if tag BASE+N has been set. */
|
|
struct recorded_attribute_info {
|
|
struct recorded_attribute_info *next;
|
|
int vendor;
|
|
unsigned int base;
|
|
unsigned long mask;
|
|
};
|
|
static struct recorded_attribute_info *recorded_attributes;
|
|
|
|
/* Record that we have seen an explicit specification of attribute TAG
|
|
for vendor VENDOR. */
|
|
|
|
static void
|
|
record_attribute (int vendor, unsigned int tag)
|
|
{
|
|
unsigned int base;
|
|
unsigned long mask;
|
|
struct recorded_attribute_info *rai;
|
|
|
|
base = tag / (8 * sizeof (rai->mask));
|
|
mask = 1UL << (tag % (8 * sizeof (rai->mask)));
|
|
for (rai = recorded_attributes; rai; rai = rai->next)
|
|
if (rai->vendor == vendor && rai->base == base)
|
|
{
|
|
rai->mask |= mask;
|
|
return;
|
|
}
|
|
|
|
rai = XNEW (struct recorded_attribute_info);
|
|
rai->next = recorded_attributes;
|
|
rai->vendor = vendor;
|
|
rai->base = base;
|
|
rai->mask = mask;
|
|
recorded_attributes = rai;
|
|
}
|
|
|
|
/* Return true if we have seen an explicit specification of attribute TAG
|
|
for vendor VENDOR. */
|
|
|
|
bfd_boolean
|
|
obj_elf_seen_attribute (int vendor, unsigned int tag)
|
|
{
|
|
unsigned int base;
|
|
unsigned long mask;
|
|
struct recorded_attribute_info *rai;
|
|
|
|
base = tag / (8 * sizeof (rai->mask));
|
|
mask = 1UL << (tag % (8 * sizeof (rai->mask)));
|
|
for (rai = recorded_attributes; rai; rai = rai->next)
|
|
if (rai->vendor == vendor && rai->base == base)
|
|
return (rai->mask & mask) != 0;
|
|
return FALSE;
|
|
}
|
|
|
|
/* Parse an attribute directive for VENDOR.
|
|
Returns the attribute number read, or zero on error. */
|
|
|
|
int
|
|
obj_elf_vendor_attribute (int vendor)
|
|
{
|
|
expressionS exp;
|
|
int type;
|
|
int tag;
|
|
unsigned int i = 0;
|
|
char *s = NULL;
|
|
|
|
/* Read the first number or name. */
|
|
skip_whitespace (input_line_pointer);
|
|
s = input_line_pointer;
|
|
if (ISDIGIT (*input_line_pointer))
|
|
{
|
|
expression (& exp);
|
|
if (exp.X_op != O_constant)
|
|
goto bad;
|
|
tag = exp.X_add_number;
|
|
}
|
|
else
|
|
{
|
|
char *name;
|
|
|
|
/* A name may contain '_', but no other punctuation. */
|
|
for (; ISALNUM (*input_line_pointer) || *input_line_pointer == '_';
|
|
++input_line_pointer)
|
|
i++;
|
|
if (i == 0)
|
|
goto bad;
|
|
|
|
name = xstrndup (s, i);
|
|
|
|
#ifndef CONVERT_SYMBOLIC_ATTRIBUTE
|
|
#define CONVERT_SYMBOLIC_ATTRIBUTE(a) -1
|
|
#endif
|
|
|
|
tag = CONVERT_SYMBOLIC_ATTRIBUTE (name);
|
|
if (tag == -1)
|
|
{
|
|
as_bad (_("Attribute name not recognised: %s"), name);
|
|
ignore_rest_of_line ();
|
|
free (name);
|
|
return 0;
|
|
}
|
|
free (name);
|
|
}
|
|
|
|
type = _bfd_elf_obj_attrs_arg_type (stdoutput, vendor, tag);
|
|
|
|
if (skip_past_comma (&input_line_pointer) == -1)
|
|
goto bad;
|
|
if (type & 1)
|
|
{
|
|
expression (& exp);
|
|
if (exp.X_op != O_constant)
|
|
{
|
|
as_bad (_("expected numeric constant"));
|
|
ignore_rest_of_line ();
|
|
return 0;
|
|
}
|
|
i = exp.X_add_number;
|
|
}
|
|
if ((type & 3) == 3
|
|
&& skip_past_comma (&input_line_pointer) == -1)
|
|
{
|
|
as_bad (_("expected comma"));
|
|
ignore_rest_of_line ();
|
|
return 0;
|
|
}
|
|
if (type & 2)
|
|
{
|
|
int len;
|
|
|
|
skip_whitespace (input_line_pointer);
|
|
if (*input_line_pointer != '"')
|
|
goto bad_string;
|
|
s = demand_copy_C_string (&len);
|
|
}
|
|
|
|
record_attribute (vendor, tag);
|
|
switch (type & 3)
|
|
{
|
|
case 3:
|
|
bfd_elf_add_obj_attr_int_string (stdoutput, vendor, tag, i, s);
|
|
break;
|
|
case 2:
|
|
bfd_elf_add_obj_attr_string (stdoutput, vendor, tag, s);
|
|
break;
|
|
case 1:
|
|
bfd_elf_add_obj_attr_int (stdoutput, vendor, tag, i);
|
|
break;
|
|
default:
|
|
abort ();
|
|
}
|
|
|
|
demand_empty_rest_of_line ();
|
|
return tag;
|
|
bad_string:
|
|
as_bad (_("bad string constant"));
|
|
ignore_rest_of_line ();
|
|
return 0;
|
|
bad:
|
|
as_bad (_("expected <tag> , <value>"));
|
|
ignore_rest_of_line ();
|
|
return 0;
|
|
}
|
|
|
|
/* Parse a .gnu_attribute directive. */
|
|
|
|
static void
|
|
obj_elf_gnu_attribute (int ignored ATTRIBUTE_UNUSED)
|
|
{
|
|
obj_elf_vendor_attribute (OBJ_ATTR_GNU);
|
|
}
|
|
|
|
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 = XNEW (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;
|
|
|
|
SKIP_WHITESPACE ();
|
|
if (*input_line_pointer == '\"')
|
|
{
|
|
unsigned int len;
|
|
|
|
++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) + 1;
|
|
|
|
/* PR 3456: Although the name field is padded out to an 4-byte
|
|
boundary, the namesz field should not be adjusted. */
|
|
i_note.namesz = len;
|
|
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);
|
|
memcpy (p, name, len);
|
|
|
|
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;
|
|
char c = get_symbol_name (&name);
|
|
char *p;
|
|
expressionS exp;
|
|
symbolS *sym;
|
|
|
|
p = input_line_pointer;
|
|
*p = c;
|
|
SKIP_WHITESPACE_AFTER_NAME ();
|
|
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 = XNEW (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 six 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"
|
|
The sixth (emitted by recent SunPRO under Solaris) is
|
|
.type SYM,[0-9]
|
|
where the integer is the STT_* value.
|
|
*/
|
|
|
|
static char *
|
|
obj_elf_type_name (char *cp)
|
|
{
|
|
char *p;
|
|
|
|
p = input_line_pointer;
|
|
if (*input_line_pointer >= '0'
|
|
&& *input_line_pointer <= '9')
|
|
{
|
|
while (*input_line_pointer >= '0'
|
|
&& *input_line_pointer <= '9')
|
|
++input_line_pointer;
|
|
*cp = *input_line_pointer;
|
|
*input_line_pointer = '\0';
|
|
}
|
|
else
|
|
*cp = get_symbol_name (&p);
|
|
|
|
return p;
|
|
}
|
|
|
|
static void
|
|
obj_elf_type (int ignore ATTRIBUTE_UNUSED)
|
|
{
|
|
char c;
|
|
int type;
|
|
const char *type_name;
|
|
symbolS *sym;
|
|
elf_symbol_type *elfsym;
|
|
|
|
sym = get_sym_from_input_line_and_check ();
|
|
c = *input_line_pointer;
|
|
elfsym = (elf_symbol_type *) symbol_get_bfdsym (sym);
|
|
|
|
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;
|
|
|
|
type_name = obj_elf_type_name (& c);
|
|
|
|
type = 0;
|
|
if (strcmp (type_name, "function") == 0
|
|
|| strcmp (type_name, "2") == 0
|
|
|| strcmp (type_name, "STT_FUNC") == 0)
|
|
type = BSF_FUNCTION;
|
|
else if (strcmp (type_name, "object") == 0
|
|
|| strcmp (type_name, "1") == 0
|
|
|| strcmp (type_name, "STT_OBJECT") == 0)
|
|
type = BSF_OBJECT;
|
|
else if (strcmp (type_name, "tls_object") == 0
|
|
|| strcmp (type_name, "6") == 0
|
|
|| strcmp (type_name, "STT_TLS") == 0)
|
|
type = BSF_OBJECT | BSF_THREAD_LOCAL;
|
|
else if (strcmp (type_name, "notype") == 0
|
|
|| strcmp (type_name, "0") == 0
|
|
|| strcmp (type_name, "STT_NOTYPE") == 0)
|
|
;
|
|
else if (strcmp (type_name, "common") == 0
|
|
|| strcmp (type_name, "5") == 0
|
|
|| strcmp (type_name, "STT_COMMON") == 0)
|
|
{
|
|
type = BSF_OBJECT;
|
|
|
|
if (! S_IS_COMMON (sym))
|
|
{
|
|
if (S_IS_VOLATILE (sym))
|
|
{
|
|
sym = symbol_clone (sym, 1);
|
|
S_SET_SEGMENT (sym, bfd_com_section_ptr);
|
|
S_SET_VALUE (sym, 0);
|
|
S_SET_EXTERNAL (sym);
|
|
symbol_set_frag (sym, &zero_address_frag);
|
|
S_CLEAR_VOLATILE (sym);
|
|
}
|
|
else if (S_IS_DEFINED (sym) || symbol_equated_p (sym))
|
|
as_bad (_("symbol '%s' is already defined"), S_GET_NAME (sym));
|
|
else
|
|
{
|
|
/* FIXME: Is it safe to just change the section ? */
|
|
S_SET_SEGMENT (sym, bfd_com_section_ptr);
|
|
S_SET_VALUE (sym, 0);
|
|
S_SET_EXTERNAL (sym);
|
|
}
|
|
}
|
|
}
|
|
else if (strcmp (type_name, "gnu_indirect_function") == 0
|
|
|| strcmp (type_name, "10") == 0
|
|
|| strcmp (type_name, "STT_GNU_IFUNC") == 0)
|
|
{
|
|
const struct elf_backend_data *bed;
|
|
|
|
bed = get_elf_backend_data (stdoutput);
|
|
if (!(bed->elf_osabi == ELFOSABI_GNU
|
|
|| bed->elf_osabi == ELFOSABI_FREEBSD
|
|
/* GNU is still using the default value 0. */
|
|
|| bed->elf_osabi == ELFOSABI_NONE))
|
|
as_bad (_("symbol type \"%s\" is supported only by GNU and FreeBSD targets"),
|
|
type_name);
|
|
type = BSF_FUNCTION | BSF_GNU_INDIRECT_FUNCTION;
|
|
}
|
|
else if (strcmp (type_name, "gnu_unique_object") == 0)
|
|
{
|
|
struct elf_backend_data *bed;
|
|
|
|
bed = (struct elf_backend_data *) get_elf_backend_data (stdoutput);
|
|
if (!(bed->elf_osabi == ELFOSABI_GNU
|
|
/* GNU is still using the default value 0. */
|
|
|| bed->elf_osabi == ELFOSABI_NONE))
|
|
as_bad (_("symbol type \"%s\" is supported only by GNU targets"),
|
|
type_name);
|
|
type = BSF_OBJECT | BSF_GNU_UNIQUE;
|
|
/* PR 10549: Always set OSABI field to GNU for objects containing unique symbols. */
|
|
bed->elf_osabi = ELFOSABI_GNU;
|
|
}
|
|
#ifdef md_elf_symbol_type
|
|
else if ((type = md_elf_symbol_type (type_name, sym, elfsym)) != -1)
|
|
;
|
|
#endif
|
|
else
|
|
as_bad (_("unrecognized symbol type \"%s\""), type_name);
|
|
|
|
*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
|
|
| SEC_MERGE | SEC_STRINGS);
|
|
comment_section->entsize = 1;
|
|
#ifdef md_elf_section_change_hook
|
|
md_elf_section_change_hook ();
|
|
#endif
|
|
p = frag_more (1);
|
|
*p = 0;
|
|
}
|
|
else
|
|
subseg_set (comment_section, 0);
|
|
stringer (8 + 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)
|
|
{
|
|
const 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);
|
|
file = as_where (NULL);
|
|
stabstr_name = concat (segment_name (seg), "str", (char *) NULL);
|
|
stroff = get_stab_string_offset (file, stabstr_name);
|
|
know (stroff == 1 || (stroff == 0 && file[0] == '\0'));
|
|
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 = concat (sec->name, "str", NULL);
|
|
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;
|
|
gas_assert (p != 0);
|
|
|
|
bfd_h_put_16 (abfd, nsyms, p + 6);
|
|
bfd_h_put_32 (abfd, strsz, p + 8);
|
|
free (name);
|
|
}
|
|
|
|
#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. */
|
|
|
|
#ifdef OBJ_MAYBE_ELF
|
|
static
|
|
#endif
|
|
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;
|
|
expressionS *size;
|
|
|
|
#ifdef NEED_ECOFF_DEBUG
|
|
if (ECOFF_DEBUGGING)
|
|
ecoff_frob_symbol (symp);
|
|
#endif
|
|
|
|
sy_obj = symbol_get_obj (symp);
|
|
|
|
size = sy_obj->size;
|
|
if (size != NULL)
|
|
{
|
|
if (resolve_expression (size)
|
|
&& size->X_op == O_constant)
|
|
S_SET_SIZE (symp, size->X_add_number);
|
|
else
|
|
{
|
|
if (!flag_allow_nonconst_size)
|
|
as_bad (_(".size expression for %s "
|
|
"does not evaluate to a constant"), S_GET_NAME (symp));
|
|
else
|
|
as_warn (_(".size expression for %s "
|
|
"does not evaluate to a constant"), S_GET_NAME (symp));
|
|
}
|
|
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);
|
|
if (p == NULL)
|
|
/* We will have already reported an error about a missing version. */
|
|
*puntp = TRUE;
|
|
|
|
/* 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. */
|
|
|
|
else 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
|
|
}
|
|
|
|
struct group_list
|
|
{
|
|
asection **head; /* Section lists. */
|
|
unsigned int *elt_count; /* Number of sections in each list. */
|
|
unsigned int num_group; /* Number of lists. */
|
|
struct hash_control *indexes; /* Maps group name to index in head array. */
|
|
};
|
|
|
|
/* 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 = (struct group_list *) inf;
|
|
const char *group_name = elf_group_name (sec);
|
|
unsigned int i;
|
|
unsigned int *elem_idx;
|
|
unsigned int *idx_ptr;
|
|
|
|
if (group_name == NULL)
|
|
return;
|
|
|
|
/* If this group already has a list, add the section to the head of
|
|
the list. */
|
|
elem_idx = (unsigned int *) hash_find (list->indexes, group_name);
|
|
if (elem_idx != NULL)
|
|
{
|
|
elf_next_in_group (sec) = list->head[*elem_idx];
|
|
list->head[*elem_idx] = sec;
|
|
list->elt_count[*elem_idx] += 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 = XRESIZEVEC (asection *, list->head, newsize);
|
|
list->elt_count = XRESIZEVEC (unsigned int, list->elt_count, newsize);
|
|
}
|
|
list->head[i] = sec;
|
|
list->elt_count[i] = 1;
|
|
list->num_group += 1;
|
|
|
|
/* Add index to hash. */
|
|
idx_ptr = XNEW (unsigned int);
|
|
*idx_ptr = i;
|
|
hash_insert (list->indexes, group_name, idx_ptr);
|
|
}
|
|
|
|
static void free_section_idx (const char *key ATTRIBUTE_UNUSED, void *val)
|
|
{
|
|
free ((unsigned int *) val);
|
|
}
|
|
|
|
void
|
|
elf_adjust_symtab (void)
|
|
{
|
|
struct group_list list;
|
|
unsigned int i;
|
|
|
|
/* Go find section groups. */
|
|
list.num_group = 0;
|
|
list.head = NULL;
|
|
list.elt_count = NULL;
|
|
list.indexes = hash_new ();
|
|
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;
|
|
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";
|
|
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];
|
|
/* Make sure that the signature symbol for the group has the
|
|
name of the group. */
|
|
sy = symbol_find_exact (group_name);
|
|
if (!sy
|
|
|| (sy != symbol_lastP
|
|
&& (sy->sy_next == NULL
|
|
|| sy->sy_next->sy_previous != sy)))
|
|
{
|
|
/* Create the symbol now. */
|
|
sy = symbol_new (group_name, now_seg, (valueT) 0, frag_now);
|
|
#ifdef TE_SOLARIS
|
|
/* Before Solaris 11 build 154, Sun ld rejects local group
|
|
signature symbols, so make them weak hidden instead. */
|
|
symbol_get_bfdsym (sy)->flags |= BSF_WEAK;
|
|
S_SET_OTHER (sy, STV_HIDDEN);
|
|
#else
|
|
symbol_get_obj (sy)->local = 1;
|
|
#endif
|
|
symbol_table_insert (sy);
|
|
}
|
|
elf_group_id (s) = symbol_get_bfdsym (sy);
|
|
|
|
size = 4 * (list.elt_count[i] + 1);
|
|
bfd_set_section_size (stdoutput, s, size);
|
|
s->contents = (unsigned char *) frag_more (size);
|
|
frag_now->fr_fix = frag_now_fix_octets ();
|
|
frag_wane (frag_now);
|
|
}
|
|
|
|
/* Cleanup hash. */
|
|
hash_traverse (list.indexes, free_section_idx);
|
|
hash_die (list.indexes);
|
|
}
|
|
|
|
void
|
|
elf_frob_file (void)
|
|
{
|
|
bfd_map_over_sections (stdoutput, adjust_stab_sections, NULL);
|
|
|
|
#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);
|
|
if (p != NULL && 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");
|
|
gas_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 void
|
|
elf_generate_asm_lineno (void)
|
|
{
|
|
#ifdef NEED_ECOFF_DEBUG
|
|
if (ECOFF_DEBUGGING)
|
|
ecoff_generate_asm_lineno ();
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
elf_process_stab (segT sec ATTRIBUTE_UNUSED,
|
|
int what ATTRIBUTE_UNUSED,
|
|
const char *string ATTRIBUTE_UNUSED,
|
|
int type ATTRIBUTE_UNUSED,
|
|
int other ATTRIBUTE_UNUSED,
|
|
int desc ATTRIBUTE_UNUSED)
|
|
{
|
|
#ifdef NEED_ECOFF_DEBUG
|
|
if (ECOFF_DEBUGGING)
|
|
ecoff_stab (sec, what, string, type, other, desc);
|
|
#endif
|
|
}
|
|
|
|
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 =
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{
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bfd_target_elf_flavour,
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0, /* dfl_leading_underscore */
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1, /* emit_section_symbols */
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elf_begin,
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elf_file_symbol,
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elf_frob_symbol,
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elf_frob_file,
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elf_frob_file_before_adjust,
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0, /* obj_frob_file_before_fix */
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elf_frob_file_after_relocs,
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elf_s_get_size, elf_s_set_size,
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elf_s_get_align, elf_s_set_align,
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elf_s_get_other,
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elf_s_set_other,
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0, /* s_get_desc */
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0, /* s_set_desc */
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0, /* s_get_type */
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0, /* s_set_type */
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elf_copy_symbol_attributes,
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elf_generate_asm_lineno,
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elf_process_stab,
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elf_separate_stab_sections,
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elf_init_stab_section,
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elf_sec_sym_ok_for_reloc,
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elf_pop_insert,
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#ifdef NEED_ECOFF_DEBUG
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elf_ecoff_set_ext,
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#else
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0, /* ecoff_set_ext */
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#endif
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elf_obj_read_begin_hook,
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elf_obj_symbol_new_hook,
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0,
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elf_adjust_symtab
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};
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