359 lines
9.1 KiB
C
359 lines
9.1 KiB
C
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/* a.out object file format
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Copyright (C) 1989-2022 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-aout.h"
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#include "as.h"
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#undef NO_RELOC
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#include "aout/aout64.h"
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void
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obj_aout_frob_symbol (symbolS *sym, int *punt ATTRIBUTE_UNUSED)
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{
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flagword flags;
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asection *sec;
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int type;
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flags = symbol_get_bfdsym (sym)->flags;
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type = aout_symbol (symbol_get_bfdsym (sym))->type;
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sec = S_GET_SEGMENT (sym);
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/* Only frob simple symbols this way right now. */
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if (! (type & ~ (N_TYPE | N_EXT)))
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{
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if (type == (N_UNDF | N_EXT)
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&& sec == bfd_abs_section_ptr)
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{
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sec = bfd_und_section_ptr;
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S_SET_SEGMENT (sym, sec);
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}
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if ((type & N_TYPE) != N_INDR
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&& (type & N_TYPE) != N_SETA
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&& (type & N_TYPE) != N_SETT
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&& (type & N_TYPE) != N_SETD
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&& (type & N_TYPE) != N_SETB
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&& type != N_WARNING
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&& (sec == bfd_abs_section_ptr
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|| sec == bfd_und_section_ptr))
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return;
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if (flags & BSF_EXPORT)
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type |= N_EXT;
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switch (type & N_TYPE)
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{
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case N_SETA:
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case N_SETT:
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case N_SETD:
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case N_SETB:
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/* Set the debugging flag for constructor symbols so that
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BFD leaves them alone. */
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symbol_get_bfdsym (sym)->flags |= BSF_DEBUGGING;
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/* You can't put a common symbol in a set. The way a set
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element works is that the symbol has a definition and a
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name, and the linker adds the definition to the set of
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that name. That does not work for a common symbol,
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because the linker can't tell which common symbol the
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user means. FIXME: Using as_bad here may be
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inappropriate, since the user may want to force a
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particular type without regard to the semantics of sets;
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on the other hand, we certainly don't want anybody to be
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mislead into thinking that their code will work. */
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if (S_IS_COMMON (sym))
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as_bad (_("Attempt to put a common symbol into set %s"),
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S_GET_NAME (sym));
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/* Similarly, you can't put an undefined symbol in a set. */
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else if (! S_IS_DEFINED (sym))
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as_bad (_("Attempt to put an undefined symbol into set %s"),
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S_GET_NAME (sym));
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break;
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case N_INDR:
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/* Put indirect symbols in the indirect section. */
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S_SET_SEGMENT (sym, bfd_ind_section_ptr);
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symbol_get_bfdsym (sym)->flags |= BSF_INDIRECT;
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if (type & N_EXT)
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{
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symbol_get_bfdsym (sym)->flags |= BSF_EXPORT;
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symbol_get_bfdsym (sym)->flags &=~ BSF_LOCAL;
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}
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break;
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case N_WARNING:
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/* Mark warning symbols. */
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symbol_get_bfdsym (sym)->flags |= BSF_WARNING;
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break;
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}
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}
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else
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symbol_get_bfdsym (sym)->flags |= BSF_DEBUGGING;
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aout_symbol (symbol_get_bfdsym (sym))->type = type;
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/* Double check weak symbols. */
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if (S_IS_WEAK (sym) && S_IS_COMMON (sym))
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as_bad (_("Symbol `%s' can not be both weak and common"),
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S_GET_NAME (sym));
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}
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/* Relocation processing may require knowing the VMAs of the sections.
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Writing to a section will cause the BFD back end to compute the
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VMAs. This function also ensures that file size is large enough
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to cover a_text and a_data should text or data be the last section
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in the file. */
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void
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obj_aout_frob_file_before_fix (void)
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{
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asection *sec;
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bfd_vma *sizep = NULL;
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if ((sec = data_section)->size != 0)
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sizep = &exec_hdr (stdoutput)->a_data;
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else if ((sec = text_section)->size != 0)
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sizep = &exec_hdr (stdoutput)->a_text;
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if (sizep)
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{
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bfd_size_type size = sec->size;
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bfd_byte b = 0;
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gas_assert (bfd_set_section_contents (stdoutput, sec, &b, size - 1, 1));
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/* We don't know the aligned size until after VMAs and sizes are
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set on the bfd_set_section_contents call. If that size is
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larger than the section then write again to ensure the file
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contents extend to cover the aligned size. */
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if (*sizep > size)
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{
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file_ptr pos = sec->filepos + *sizep;
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gas_assert (bfd_seek (stdoutput, pos - 1, SEEK_SET) == 0
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&& bfd_bwrite (&b, 1, stdoutput) == 1);
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}
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}
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}
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static void
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obj_aout_line (int ignore ATTRIBUTE_UNUSED)
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{
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/* Assume delimiter is part of expression.
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BSD4.2 as fails with delightful bug, so we
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are not being incompatible here. */
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new_logical_line ((char *) NULL, (int) (get_absolute_expression ()));
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demand_empty_rest_of_line ();
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}
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/* Handle .weak. This is a GNU extension. */
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static void
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obj_aout_weak (int ignore ATTRIBUTE_UNUSED)
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{
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char *name;
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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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c = get_symbol_name (&name);
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symbolP = symbol_find_or_make (name);
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(void) restore_line_pointer (c);
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SKIP_WHITESPACE ();
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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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/* Handle .type. On {Net,Open}BSD, this is used to set the n_other field,
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which is then apparently used when doing dynamic linking. Older
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versions of gas ignored the .type pseudo-op, so we also ignore it if
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we can't parse it. */
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static void
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obj_aout_type (int ignore ATTRIBUTE_UNUSED)
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{
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char *name;
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int 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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(void) restore_line_pointer (c);
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SKIP_WHITESPACE ();
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if (*input_line_pointer == ',')
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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 == '@')
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{
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++input_line_pointer;
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if (startswith (input_line_pointer, "object"))
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S_SET_OTHER (sym, 1);
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else if (startswith (input_line_pointer, "function"))
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S_SET_OTHER (sym, 2);
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}
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}
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/* Ignore everything else on the line. */
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s_ignore (0);
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}
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/* Support for an AOUT emulation. */
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static void
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aout_pop_insert (void)
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{
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pop_insert (aout_pseudo_table);
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}
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static int
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obj_aout_s_get_other (symbolS *sym)
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{
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return aout_symbol (symbol_get_bfdsym (sym))->other;
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}
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static void
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obj_aout_s_set_other (symbolS *sym, int o)
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{
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aout_symbol (symbol_get_bfdsym (sym))->other = o;
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}
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static int
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obj_aout_sec_sym_ok_for_reloc (asection *sec ATTRIBUTE_UNUSED)
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{
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return obj_sec_sym_ok_for_reloc (sec);
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}
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static void
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obj_aout_process_stab (segT seg ATTRIBUTE_UNUSED,
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int w,
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const char *s,
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int t,
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int o,
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int d)
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{
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aout_process_stab (w, s, t, o, d);
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}
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static int
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obj_aout_s_get_desc (symbolS *sym)
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{
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return aout_symbol (symbol_get_bfdsym (sym))->desc;
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}
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static void
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obj_aout_s_set_desc (symbolS *sym, int d)
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{
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aout_symbol (symbol_get_bfdsym (sym))->desc = d;
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}
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static int
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obj_aout_s_get_type (symbolS *sym)
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{
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return aout_symbol (symbol_get_bfdsym (sym))->type;
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}
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static void
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obj_aout_s_set_type (symbolS *sym, int t)
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{
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aout_symbol (symbol_get_bfdsym (sym))->type = t;
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}
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static int
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obj_aout_separate_stab_sections (void)
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{
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return 0;
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}
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/* When changed, make sure these table entries match the single-format
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definitions in obj-aout.h. */
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const struct format_ops aout_format_ops =
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{
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bfd_target_aout_flavour,
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1, /* dfl_leading_underscore. */
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0, /* emit_section_symbols. */
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0, /* begin. */
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0, /* app_file. */
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obj_aout_frob_symbol,
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0, /* frob_file. */
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0, /* frob_file_before_adjust. */
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obj_aout_frob_file_before_fix,
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0, /* frob_file_after_relocs. */
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0, /* s_get_size. */
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0, /* s_set_size. */
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0, /* s_get_align. */
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0, /* s_set_align. */
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obj_aout_s_get_other,
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obj_aout_s_set_other,
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obj_aout_s_get_desc,
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obj_aout_s_set_desc,
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obj_aout_s_get_type,
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obj_aout_s_set_type,
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0, /* copy_symbol_attributes. */
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0, /* generate_asm_lineno. */
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obj_aout_process_stab,
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obj_aout_separate_stab_sections,
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0, /* init_stab_section. */
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obj_aout_sec_sym_ok_for_reloc,
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aout_pop_insert,
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0, /* ecoff_set_ext. */
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0, /* read_begin_hook. */
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0, /* symbol_new_hook. */
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0, /* symbol_clone_hook. */
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0 /* adjust_symtab. */
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};
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const pseudo_typeS aout_pseudo_table[] =
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{
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{"line", obj_aout_line, 0}, /* Source code line number. */
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{"ln", obj_aout_line, 0}, /* COFF line number that we use anyway. */
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{"weak", obj_aout_weak, 0}, /* Mark symbol as weak. */
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{"type", obj_aout_type, 0},
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/* coff debug pseudos (ignored) */
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{"def", s_ignore, 0},
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{"dim", s_ignore, 0},
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{"endef", s_ignore, 0},
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{"ident", s_ignore, 0},
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{"line", s_ignore, 0},
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{"ln", s_ignore, 0},
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{"scl", s_ignore, 0},
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{"size", s_ignore, 0},
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{"tag", s_ignore, 0},
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{"val", s_ignore, 0},
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{"version", s_ignore, 0},
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{"optim", s_ignore, 0}, /* For sun386i cc (?). */
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/* other stuff */
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{"ABORT", s_abort, 0},
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{NULL, NULL, 0}
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};
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