358 lines
9.1 KiB
C
358 lines
9.1 KiB
C
/* a.out object file format
|
|
Copyright (C) 1989-2022 Free Software Foundation, Inc.
|
|
|
|
This file is part of GAS, the GNU Assembler.
|
|
|
|
GAS is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as
|
|
published by the Free Software Foundation; either version 3,
|
|
or (at your option) any later version.
|
|
|
|
GAS is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
|
|
the GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GAS; see the file COPYING. If not, write to the Free
|
|
Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
|
|
02110-1301, USA. */
|
|
|
|
#define OBJ_HEADER "obj-aout.h"
|
|
|
|
#include "as.h"
|
|
#undef NO_RELOC
|
|
#include "aout/aout64.h"
|
|
|
|
void
|
|
obj_aout_frob_symbol (symbolS *sym, int *punt ATTRIBUTE_UNUSED)
|
|
{
|
|
flagword flags;
|
|
asection *sec;
|
|
int type;
|
|
|
|
flags = symbol_get_bfdsym (sym)->flags;
|
|
type = aout_symbol (symbol_get_bfdsym (sym))->type;
|
|
sec = S_GET_SEGMENT (sym);
|
|
|
|
/* Only frob simple symbols this way right now. */
|
|
if (! (type & ~ (N_TYPE | N_EXT)))
|
|
{
|
|
if (type == (N_UNDF | N_EXT)
|
|
&& sec == bfd_abs_section_ptr)
|
|
{
|
|
sec = bfd_und_section_ptr;
|
|
S_SET_SEGMENT (sym, sec);
|
|
}
|
|
|
|
if ((type & N_TYPE) != N_INDR
|
|
&& (type & N_TYPE) != N_SETA
|
|
&& (type & N_TYPE) != N_SETT
|
|
&& (type & N_TYPE) != N_SETD
|
|
&& (type & N_TYPE) != N_SETB
|
|
&& type != N_WARNING
|
|
&& (sec == bfd_abs_section_ptr
|
|
|| sec == bfd_und_section_ptr))
|
|
return;
|
|
if (flags & BSF_EXPORT)
|
|
type |= N_EXT;
|
|
|
|
switch (type & N_TYPE)
|
|
{
|
|
case N_SETA:
|
|
case N_SETT:
|
|
case N_SETD:
|
|
case N_SETB:
|
|
/* Set the debugging flag for constructor symbols so that
|
|
BFD leaves them alone. */
|
|
symbol_get_bfdsym (sym)->flags |= BSF_DEBUGGING;
|
|
|
|
/* You can't put a common symbol in a set. The way a set
|
|
element works is that the symbol has a definition and a
|
|
name, and the linker adds the definition to the set of
|
|
that name. That does not work for a common symbol,
|
|
because the linker can't tell which common symbol the
|
|
user means. FIXME: Using as_bad here may be
|
|
inappropriate, since the user may want to force a
|
|
particular type without regard to the semantics of sets;
|
|
on the other hand, we certainly don't want anybody to be
|
|
mislead into thinking that their code will work. */
|
|
if (S_IS_COMMON (sym))
|
|
as_bad (_("Attempt to put a common symbol into set %s"),
|
|
S_GET_NAME (sym));
|
|
/* Similarly, you can't put an undefined symbol in a set. */
|
|
else if (! S_IS_DEFINED (sym))
|
|
as_bad (_("Attempt to put an undefined symbol into set %s"),
|
|
S_GET_NAME (sym));
|
|
|
|
break;
|
|
case N_INDR:
|
|
/* Put indirect symbols in the indirect section. */
|
|
S_SET_SEGMENT (sym, bfd_ind_section_ptr);
|
|
symbol_get_bfdsym (sym)->flags |= BSF_INDIRECT;
|
|
if (type & N_EXT)
|
|
{
|
|
symbol_get_bfdsym (sym)->flags |= BSF_EXPORT;
|
|
symbol_get_bfdsym (sym)->flags &=~ BSF_LOCAL;
|
|
}
|
|
break;
|
|
case N_WARNING:
|
|
/* Mark warning symbols. */
|
|
symbol_get_bfdsym (sym)->flags |= BSF_WARNING;
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
symbol_get_bfdsym (sym)->flags |= BSF_DEBUGGING;
|
|
|
|
aout_symbol (symbol_get_bfdsym (sym))->type = type;
|
|
|
|
/* Double check weak symbols. */
|
|
if (S_IS_WEAK (sym) && S_IS_COMMON (sym))
|
|
as_bad (_("Symbol `%s' can not be both weak and common"),
|
|
S_GET_NAME (sym));
|
|
}
|
|
|
|
/* Relocation processing may require knowing the VMAs of the sections.
|
|
Writing to a section will cause the BFD back end to compute the
|
|
VMAs. This function also ensures that file size is large enough
|
|
to cover a_text and a_data should text or data be the last section
|
|
in the file. */
|
|
|
|
void
|
|
obj_aout_frob_file_before_fix (void)
|
|
{
|
|
asection *sec;
|
|
bfd_vma *sizep = NULL;
|
|
if ((sec = data_section)->size != 0)
|
|
sizep = &exec_hdr (stdoutput)->a_data;
|
|
else if ((sec = text_section)->size != 0)
|
|
sizep = &exec_hdr (stdoutput)->a_text;
|
|
if (sizep)
|
|
{
|
|
bfd_size_type size = sec->size;
|
|
bfd_byte b = 0;
|
|
|
|
gas_assert (bfd_set_section_contents (stdoutput, sec, &b, size - 1, 1));
|
|
|
|
/* We don't know the aligned size until after VMAs and sizes are
|
|
set on the bfd_set_section_contents call. If that size is
|
|
larger than the section then write again to ensure the file
|
|
contents extend to cover the aligned size. */
|
|
if (*sizep > size)
|
|
{
|
|
file_ptr pos = sec->filepos + *sizep;
|
|
|
|
gas_assert (bfd_seek (stdoutput, pos - 1, SEEK_SET) == 0
|
|
&& bfd_bwrite (&b, 1, stdoutput) == 1);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
obj_aout_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 ((char *) NULL, (int) (get_absolute_expression ()));
|
|
demand_empty_rest_of_line ();
|
|
}
|
|
|
|
/* Handle .weak. This is a GNU extension. */
|
|
|
|
static void
|
|
obj_aout_weak (int ignore ATTRIBUTE_UNUSED)
|
|
{
|
|
char *name;
|
|
int c;
|
|
symbolS *symbolP;
|
|
|
|
do
|
|
{
|
|
c = get_symbol_name (&name);
|
|
symbolP = symbol_find_or_make (name);
|
|
(void) restore_line_pointer (c);
|
|
SKIP_WHITESPACE ();
|
|
S_SET_WEAK (symbolP);
|
|
if (c == ',')
|
|
{
|
|
input_line_pointer++;
|
|
SKIP_WHITESPACE ();
|
|
if (*input_line_pointer == '\n')
|
|
c = '\n';
|
|
}
|
|
}
|
|
while (c == ',');
|
|
demand_empty_rest_of_line ();
|
|
}
|
|
|
|
/* Handle .type. On {Net,Open}BSD, this is used to set the n_other field,
|
|
which is then apparently used when doing dynamic linking. Older
|
|
versions of gas ignored the .type pseudo-op, so we also ignore it if
|
|
we can't parse it. */
|
|
|
|
static void
|
|
obj_aout_type (int ignore ATTRIBUTE_UNUSED)
|
|
{
|
|
char *name;
|
|
int c;
|
|
symbolS *sym;
|
|
|
|
c = get_symbol_name (&name);
|
|
sym = symbol_find_or_make (name);
|
|
(void) restore_line_pointer (c);
|
|
SKIP_WHITESPACE ();
|
|
if (*input_line_pointer == ',')
|
|
{
|
|
++input_line_pointer;
|
|
SKIP_WHITESPACE ();
|
|
if (*input_line_pointer == '@')
|
|
{
|
|
++input_line_pointer;
|
|
if (startswith (input_line_pointer, "object"))
|
|
S_SET_OTHER (sym, 1);
|
|
else if (startswith (input_line_pointer, "function"))
|
|
S_SET_OTHER (sym, 2);
|
|
}
|
|
}
|
|
|
|
/* Ignore everything else on the line. */
|
|
s_ignore (0);
|
|
}
|
|
|
|
/* Support for an AOUT emulation. */
|
|
|
|
static void
|
|
aout_pop_insert (void)
|
|
{
|
|
pop_insert (aout_pseudo_table);
|
|
}
|
|
|
|
static int
|
|
obj_aout_s_get_other (symbolS *sym)
|
|
{
|
|
return aout_symbol (symbol_get_bfdsym (sym))->other;
|
|
}
|
|
|
|
static void
|
|
obj_aout_s_set_other (symbolS *sym, int o)
|
|
{
|
|
aout_symbol (symbol_get_bfdsym (sym))->other = o;
|
|
}
|
|
|
|
static int
|
|
obj_aout_sec_sym_ok_for_reloc (asection *sec ATTRIBUTE_UNUSED)
|
|
{
|
|
return obj_sec_sym_ok_for_reloc (sec);
|
|
}
|
|
|
|
static void
|
|
obj_aout_process_stab (segT seg ATTRIBUTE_UNUSED,
|
|
int w,
|
|
const char *s,
|
|
int t,
|
|
int o,
|
|
int d)
|
|
{
|
|
aout_process_stab (w, s, t, o, d);
|
|
}
|
|
|
|
static int
|
|
obj_aout_s_get_desc (symbolS *sym)
|
|
{
|
|
return aout_symbol (symbol_get_bfdsym (sym))->desc;
|
|
}
|
|
|
|
static void
|
|
obj_aout_s_set_desc (symbolS *sym, int d)
|
|
{
|
|
aout_symbol (symbol_get_bfdsym (sym))->desc = d;
|
|
}
|
|
|
|
static int
|
|
obj_aout_s_get_type (symbolS *sym)
|
|
{
|
|
return aout_symbol (symbol_get_bfdsym (sym))->type;
|
|
}
|
|
|
|
static void
|
|
obj_aout_s_set_type (symbolS *sym, int t)
|
|
{
|
|
aout_symbol (symbol_get_bfdsym (sym))->type = t;
|
|
}
|
|
|
|
static int
|
|
obj_aout_separate_stab_sections (void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/* When changed, make sure these table entries match the single-format
|
|
definitions in obj-aout.h. */
|
|
|
|
const struct format_ops aout_format_ops =
|
|
{
|
|
bfd_target_aout_flavour,
|
|
1, /* dfl_leading_underscore. */
|
|
0, /* emit_section_symbols. */
|
|
0, /* begin. */
|
|
0, /* app_file. */
|
|
obj_aout_frob_symbol,
|
|
0, /* frob_file. */
|
|
0, /* frob_file_before_adjust. */
|
|
obj_aout_frob_file_before_fix,
|
|
0, /* frob_file_after_relocs. */
|
|
0, /* s_get_size. */
|
|
0, /* s_set_size. */
|
|
0, /* s_get_align. */
|
|
0, /* s_set_align. */
|
|
obj_aout_s_get_other,
|
|
obj_aout_s_set_other,
|
|
obj_aout_s_get_desc,
|
|
obj_aout_s_set_desc,
|
|
obj_aout_s_get_type,
|
|
obj_aout_s_set_type,
|
|
0, /* copy_symbol_attributes. */
|
|
0, /* generate_asm_lineno. */
|
|
obj_aout_process_stab,
|
|
obj_aout_separate_stab_sections,
|
|
0, /* init_stab_section. */
|
|
obj_aout_sec_sym_ok_for_reloc,
|
|
aout_pop_insert,
|
|
0, /* ecoff_set_ext. */
|
|
0, /* read_begin_hook. */
|
|
0, /* symbol_new_hook. */
|
|
0, /* symbol_clone_hook. */
|
|
0 /* adjust_symtab. */
|
|
};
|
|
|
|
const pseudo_typeS aout_pseudo_table[] =
|
|
{
|
|
{"line", obj_aout_line, 0}, /* Source code line number. */
|
|
{"ln", obj_aout_line, 0}, /* COFF line number that we use anyway. */
|
|
|
|
{"weak", obj_aout_weak, 0}, /* Mark symbol as weak. */
|
|
|
|
{"type", obj_aout_type, 0},
|
|
|
|
/* coff debug pseudos (ignored) */
|
|
{"def", s_ignore, 0},
|
|
{"dim", s_ignore, 0},
|
|
{"endef", s_ignore, 0},
|
|
{"ident", s_ignore, 0},
|
|
{"line", s_ignore, 0},
|
|
{"ln", s_ignore, 0},
|
|
{"scl", s_ignore, 0},
|
|
{"size", s_ignore, 0},
|
|
{"tag", s_ignore, 0},
|
|
{"val", s_ignore, 0},
|
|
{"version", s_ignore, 0},
|
|
|
|
{"optim", s_ignore, 0}, /* For sun386i cc (?). */
|
|
|
|
/* other stuff */
|
|
{"ABORT", s_abort, 0},
|
|
|
|
{NULL, NULL, 0}
|
|
};
|