349 lines
11 KiB
C
349 lines
11 KiB
C
/* b.out object file format
|
|
Copyright (C) 1989, 90, 91, 92, 93, 94, 95, 1996
|
|
Free Software Foundation, Inc.
|
|
|
|
This file is part of GAS, the GNU Assembler.
|
|
|
|
GAS is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as
|
|
published by the Free Software Foundation; either version 2,
|
|
or (at your option) any later version.
|
|
|
|
GAS is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
|
|
the GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public
|
|
License along with GAS; see the file COPYING. If not, write
|
|
to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
|
|
|
#include "as.h"
|
|
#include "obstack.h"
|
|
const short /* in: segT out: N_TYPE bits */
|
|
seg_N_TYPE[] =
|
|
{
|
|
N_ABS,
|
|
N_TEXT,
|
|
N_DATA,
|
|
N_BSS,
|
|
N_UNDF, /* unknown */
|
|
N_UNDF, /* error */
|
|
N_UNDF, /* expression */
|
|
N_UNDF, /* debug */
|
|
N_UNDF, /* ntv */
|
|
N_UNDF, /* ptv */
|
|
N_REGISTER, /* register */
|
|
};
|
|
|
|
const segT N_TYPE_seg[N_TYPE + 2] =
|
|
{ /* N_TYPE == 0x1E = 32-2 */
|
|
SEG_UNKNOWN, /* N_UNDF == 0 */
|
|
SEG_GOOF,
|
|
SEG_ABSOLUTE, /* N_ABS == 2 */
|
|
SEG_GOOF,
|
|
SEG_TEXT, /* N_TEXT == 4 */
|
|
SEG_GOOF,
|
|
SEG_DATA, /* N_DATA == 6 */
|
|
SEG_GOOF,
|
|
SEG_BSS, /* N_BSS == 8 */
|
|
SEG_GOOF,
|
|
SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF,
|
|
SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF,
|
|
SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF,
|
|
SEG_REGISTER, /* dummy N_REGISTER for regs = 30 */
|
|
SEG_GOOF,
|
|
};
|
|
|
|
static void obj_bout_line PARAMS ((int));
|
|
|
|
const pseudo_typeS obj_pseudo_table[] =
|
|
{
|
|
{"line", obj_bout_line, 0}, /* source code line number */
|
|
|
|
/* coff debugging directives. Currently ignored silently */
|
|
{"def", s_ignore, 0},
|
|
{"dim", s_ignore, 0},
|
|
{"endef", s_ignore, 0},
|
|
{"ln", s_ignore, 0},
|
|
{"scl", s_ignore, 0},
|
|
{"size", s_ignore, 0},
|
|
{"tag", s_ignore, 0},
|
|
{"type", s_ignore, 0},
|
|
{"val", s_ignore, 0},
|
|
|
|
/* other stuff we don't handle */
|
|
{"ABORT", s_ignore, 0},
|
|
{"ident", s_ignore, 0},
|
|
|
|
{NULL} /* end sentinel */
|
|
}; /* obj_pseudo_table */
|
|
|
|
/* Relocation. */
|
|
|
|
/*
|
|
* emit_relocations()
|
|
*
|
|
* Crawl along a fixS chain. Emit the segment's relocations.
|
|
*/
|
|
void
|
|
obj_emit_relocations (where, fixP, segment_address_in_file)
|
|
char **where;
|
|
fixS *fixP; /* Fixup chain for this segment. */
|
|
relax_addressT segment_address_in_file;
|
|
{
|
|
for (; fixP; fixP = fixP->fx_next)
|
|
{
|
|
if (fixP->fx_done == 0
|
|
|| fixP->fx_r_type != NO_RELOC)
|
|
{
|
|
symbolS *sym;
|
|
|
|
sym = fixP->fx_addsy;
|
|
while (sym->sy_value.X_op == O_symbol
|
|
&& (! S_IS_DEFINED (sym) || S_IS_COMMON (sym)))
|
|
sym = sym->sy_value.X_add_symbol;
|
|
fixP->fx_addsy = sym;
|
|
|
|
tc_bout_fix_to_chars (*where, fixP, segment_address_in_file);
|
|
*where += sizeof (struct relocation_info);
|
|
} /* if there's a symbol */
|
|
} /* for each fixup */
|
|
|
|
} /* emit_relocations() */
|
|
|
|
/* Aout file generation & utilities */
|
|
|
|
/* Convert a lvalue to machine dependent data */
|
|
void
|
|
obj_header_append (where, headers)
|
|
char **where;
|
|
object_headers *headers;
|
|
{
|
|
/* Always leave in host byte order */
|
|
|
|
headers->header.a_talign = section_alignment[SEG_TEXT];
|
|
|
|
if (headers->header.a_talign < 2)
|
|
{
|
|
headers->header.a_talign = 2;
|
|
} /* force to at least 2 */
|
|
|
|
headers->header.a_dalign = section_alignment[SEG_DATA];
|
|
headers->header.a_balign = section_alignment[SEG_BSS];
|
|
|
|
headers->header.a_tload = 0;
|
|
headers->header.a_dload = md_section_align (SEG_DATA, H_GET_TEXT_SIZE (headers));
|
|
|
|
headers->header.a_relaxable = linkrelax;
|
|
|
|
#ifdef CROSS_COMPILE
|
|
md_number_to_chars (*where, headers->header.a_magic, sizeof (headers->header.a_magic));
|
|
*where += sizeof (headers->header.a_magic);
|
|
md_number_to_chars (*where, headers->header.a_text, sizeof (headers->header.a_text));
|
|
*where += sizeof (headers->header.a_text);
|
|
md_number_to_chars (*where, headers->header.a_data, sizeof (headers->header.a_data));
|
|
*where += sizeof (headers->header.a_data);
|
|
md_number_to_chars (*where, headers->header.a_bss, sizeof (headers->header.a_bss));
|
|
*where += sizeof (headers->header.a_bss);
|
|
md_number_to_chars (*where, headers->header.a_syms, sizeof (headers->header.a_syms));
|
|
*where += sizeof (headers->header.a_syms);
|
|
md_number_to_chars (*where, headers->header.a_entry, sizeof (headers->header.a_entry));
|
|
*where += sizeof (headers->header.a_entry);
|
|
md_number_to_chars (*where, headers->header.a_trsize, sizeof (headers->header.a_trsize));
|
|
*where += sizeof (headers->header.a_trsize);
|
|
md_number_to_chars (*where, headers->header.a_drsize, sizeof (headers->header.a_drsize));
|
|
*where += sizeof (headers->header.a_drsize);
|
|
md_number_to_chars (*where, headers->header.a_tload, sizeof (headers->header.a_tload));
|
|
*where += sizeof (headers->header.a_tload);
|
|
md_number_to_chars (*where, headers->header.a_dload, sizeof (headers->header.a_dload));
|
|
*where += sizeof (headers->header.a_dload);
|
|
md_number_to_chars (*where, headers->header.a_talign, sizeof (headers->header.a_talign));
|
|
*where += sizeof (headers->header.a_talign);
|
|
md_number_to_chars (*where, headers->header.a_dalign, sizeof (headers->header.a_dalign));
|
|
*where += sizeof (headers->header.a_dalign);
|
|
md_number_to_chars (*where, headers->header.a_balign, sizeof (headers->header.a_balign));
|
|
*where += sizeof (headers->header.a_balign);
|
|
md_number_to_chars (*where, headers->header.a_relaxable, sizeof (headers->header.a_relaxable));
|
|
*where += sizeof (headers->header.a_relaxable);
|
|
#else /* ! CROSS_COMPILE */
|
|
append (where, (char *) &headers->header, sizeof (headers->header));
|
|
#endif /* ! CROSS_COMPILE */
|
|
} /* a_header_append() */
|
|
|
|
void
|
|
obj_symbol_to_chars (where, symbolP)
|
|
char **where;
|
|
symbolS *symbolP;
|
|
{
|
|
md_number_to_chars ((char *) &(S_GET_OFFSET (symbolP)), S_GET_OFFSET (symbolP), sizeof (S_GET_OFFSET (symbolP)));
|
|
md_number_to_chars ((char *) &(S_GET_DESC (symbolP)), S_GET_DESC (symbolP), sizeof (S_GET_DESC (symbolP)));
|
|
md_number_to_chars ((char *) &symbolP->sy_symbol.n_value, S_GET_VALUE (symbolP), sizeof (symbolP->sy_symbol.n_value));
|
|
|
|
append (where, (char *) &symbolP->sy_symbol, sizeof (obj_symbol_type));
|
|
} /* obj_symbol_to_chars() */
|
|
|
|
void
|
|
obj_emit_symbols (where, symbol_rootP)
|
|
char **where;
|
|
symbolS *symbol_rootP;
|
|
{
|
|
symbolS *symbolP;
|
|
|
|
/*
|
|
* Emit all symbols left in the symbol chain.
|
|
*/
|
|
for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP))
|
|
{
|
|
/* Used to save the offset of the name. It is used to point
|
|
to the string in memory but must be a file offset. */
|
|
char *temp;
|
|
|
|
temp = S_GET_NAME (symbolP);
|
|
S_SET_OFFSET (symbolP, symbolP->sy_name_offset);
|
|
|
|
/* Any symbol still undefined and is not a dbg symbol is made N_EXT. */
|
|
if (!S_IS_DEBUG (symbolP) && !S_IS_DEFINED (symbolP))
|
|
S_SET_EXTERNAL (symbolP);
|
|
|
|
obj_symbol_to_chars (where, symbolP);
|
|
S_SET_NAME (symbolP, temp);
|
|
}
|
|
} /* emit_symbols() */
|
|
|
|
void
|
|
obj_symbol_new_hook (symbolP)
|
|
symbolS *symbolP;
|
|
{
|
|
S_SET_OTHER (symbolP, 0);
|
|
S_SET_DESC (symbolP, 0);
|
|
}
|
|
|
|
static void
|
|
obj_bout_line (ignore)
|
|
int ignore;
|
|
{
|
|
/* Assume delimiter is part of expression. */
|
|
/* BSD4.2 as fails with delightful bug, so we */
|
|
/* are not being incompatible here. */
|
|
new_logical_line ((char *) NULL, (int) (get_absolute_expression ()));
|
|
demand_empty_rest_of_line ();
|
|
} /* obj_bout_line() */
|
|
|
|
void
|
|
obj_read_begin_hook ()
|
|
{
|
|
}
|
|
|
|
void
|
|
obj_crawl_symbol_chain (headers)
|
|
object_headers *headers;
|
|
{
|
|
symbolS **symbolPP;
|
|
symbolS *symbolP;
|
|
int symbol_number = 0;
|
|
|
|
tc_crawl_symbol_chain (headers);
|
|
|
|
symbolPP = &symbol_rootP; /*->last symbol chain link. */
|
|
while ((symbolP = *symbolPP) != NULL)
|
|
{
|
|
if (flag_readonly_data_in_text && (S_GET_SEGMENT (symbolP) == SEG_DATA))
|
|
{
|
|
S_SET_SEGMENT (symbolP, SEG_TEXT);
|
|
} /* if pusing data into text */
|
|
|
|
resolve_symbol_value (symbolP);
|
|
|
|
/* Skip symbols which were equated to undefined or common
|
|
symbols. */
|
|
if (symbolP->sy_value.X_op == O_symbol
|
|
&& (! S_IS_DEFINED (symbolP) || S_IS_COMMON (symbolP)))
|
|
{
|
|
*symbolPP = symbol_next (symbolP);
|
|
continue;
|
|
}
|
|
|
|
/* OK, here is how we decide which symbols go out into the
|
|
brave new symtab. Symbols that do are:
|
|
|
|
* symbols with no name (stabd's?)
|
|
* symbols with debug info in their N_TYPE
|
|
|
|
Symbols that don't are:
|
|
* symbols that are registers
|
|
* symbols with \1 as their 3rd character (numeric labels)
|
|
* "local labels" as defined by S_LOCAL_NAME(name)
|
|
if the -L switch was passed to gas.
|
|
|
|
All other symbols are output. We complain if a deleted
|
|
symbol was marked external. */
|
|
|
|
|
|
if (1
|
|
&& !S_IS_REGISTER (symbolP)
|
|
&& (!S_GET_NAME (symbolP)
|
|
|| S_IS_DEBUG (symbolP)
|
|
#ifdef TC_I960
|
|
/* FIXME-SOON this ifdef seems highly dubious to me. xoxorich. */
|
|
|| !S_IS_DEFINED (symbolP)
|
|
|| S_IS_EXTERNAL (symbolP)
|
|
#endif /* TC_I960 */
|
|
|| (S_GET_NAME (symbolP)[0] != '\001' && (flag_keep_locals || !S_LOCAL_NAME (symbolP)))))
|
|
{
|
|
symbolP->sy_number = symbol_number++;
|
|
|
|
/* The + 1 after strlen account for the \0 at the
|
|
end of each string */
|
|
if (!S_IS_STABD (symbolP))
|
|
{
|
|
/* Ordinary case. */
|
|
symbolP->sy_name_offset = string_byte_count;
|
|
string_byte_count += strlen (S_GET_NAME (symbolP)) + 1;
|
|
}
|
|
else /* .Stabd case. */
|
|
symbolP->sy_name_offset = 0;
|
|
symbolPP = &(symbol_next (symbolP));
|
|
}
|
|
else
|
|
{
|
|
if (S_IS_EXTERNAL (symbolP) || !S_IS_DEFINED (symbolP))
|
|
{
|
|
as_bad ("Local symbol %s never defined", S_GET_NAME (symbolP));
|
|
} /* oops. */
|
|
|
|
/* Unhook it from the chain */
|
|
*symbolPP = symbol_next (symbolP);
|
|
} /* if this symbol should be in the output */
|
|
} /* for each symbol */
|
|
|
|
H_SET_SYMBOL_TABLE_SIZE (headers, symbol_number);
|
|
}
|
|
|
|
/*
|
|
* Find strings by crawling along symbol table chain.
|
|
*/
|
|
|
|
void
|
|
obj_emit_strings (where)
|
|
char **where;
|
|
{
|
|
symbolS *symbolP;
|
|
|
|
#ifdef CROSS_COMPILE
|
|
/* Gotta do md_ byte-ordering stuff for string_byte_count first - KWK */
|
|
md_number_to_chars (*where, string_byte_count, sizeof (string_byte_count));
|
|
*where += sizeof (string_byte_count);
|
|
#else /* CROSS_COMPILE */
|
|
append (where, (char *) &string_byte_count, (unsigned long) sizeof (string_byte_count));
|
|
#endif /* CROSS_COMPILE */
|
|
|
|
for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP))
|
|
{
|
|
if (S_GET_NAME (symbolP))
|
|
append (where, S_GET_NAME (symbolP), (unsigned long) (strlen (S_GET_NAME (symbolP)) + 1));
|
|
} /* walk symbol chain */
|
|
}
|
|
|
|
/* end of obj-bout.c */
|