binutils-gdb/gas/config/obj-bout.c

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/* b.out object file format
Copyright 1989, 1990, 1991, 1992, 1993, 1994, 1996, 2000, 2001
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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.
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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. */
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#include "as.h"
#include "obstack.h"
/* In: segT Out: N_TYPE bits */
const short seg_N_TYPE[] =
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{
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 */
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};
const segT N_TYPE_seg[N_TYPE + 2] =
{ /* N_TYPE == 0x1E = 32-2 */
SEG_UNKNOWN, /* N_UNDF == 0 */
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SEG_GOOF,
SEG_ABSOLUTE, /* N_ABS == 2 */
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SEG_GOOF,
SEG_TEXT, /* N_TEXT == 4 */
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SEG_GOOF,
SEG_DATA, /* N_DATA == 6 */
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SEG_GOOF,
SEG_BSS, /* N_BSS == 8 */
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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 */
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SEG_GOOF,
};
static void obj_bout_line PARAMS ((int));
const pseudo_typeS obj_pseudo_table[] =
{
{"line", obj_bout_line, 0}, /* Source code line number. */
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/* coff debugging directives. Currently ignored silently. */
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{"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. */
};
/* Relocation. */
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/* Crawl along a fixS chain. Emit the segment's relocations. */
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void
obj_emit_relocations (where, fixP, segment_address_in_file)
char **where;
fixS *fixP; /* Fixup chain for this segment. */
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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 */
}
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/* Aout file generation & utilities . */
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/* Convert a lvalue to machine dependent data. */
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void
obj_header_append (where, headers)
char **where;
object_headers *headers;
{
/* Always leave in host byte order. */
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headers->header.a_talign = section_alignment[SEG_TEXT];
/* Force to at least 2. */
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if (headers->header.a_talign < 2)
{
headers->header.a_talign = 2;
}
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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));
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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 */
}
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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));
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append (where, (char *) &symbolP->sy_symbol, sizeof (obj_symbol_type));
}
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void
obj_emit_symbols (where, symbol_rootP)
char **where;
symbolS *symbol_rootP;
{
symbolS *symbolP;
/* Emit all symbols left in the symbol chain. */
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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. */
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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. */
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if (!S_IS_DEBUG (symbolP) && !S_IS_DEFINED (symbolP))
S_SET_EXTERNAL (symbolP);
obj_symbol_to_chars (where, symbolP);
S_SET_NAME (symbolP, temp);
}
}
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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. */
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new_logical_line ((char *) NULL, (int) (get_absolute_expression ()));
demand_empty_rest_of_line ();
}
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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. */
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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 */
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resolve_symbol_value (symbolP);
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/* 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:
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* symbols with no name (stabd's?)
* symbols with debug info in their N_TYPE
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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. */
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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. */
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|| !S_IS_DEFINED (symbolP)
|| S_IS_EXTERNAL (symbolP)
#endif /* TC_I960 */
|| (S_GET_NAME (symbolP)[0] != '\001'
&& (flag_keep_locals || !S_LOCAL_NAME (symbolP)))))
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{
symbolP->sy_number = symbol_number++;
/* The + 1 after strlen account for the \0 at the end of
each string. */
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if (!S_IS_STABD (symbolP))
{
/* Ordinary case. */
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symbolP->sy_name_offset = string_byte_count;
string_byte_count += strlen (S_GET_NAME (symbolP)) + 1;
}
else /* .Stabd case. */
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symbolP->sy_name_offset = 0;
symbolPP = &(symbolP->sy_next);
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}
else
{
if (S_IS_EXTERNAL (symbolP) || !S_IS_DEFINED (symbolP))
{
as_bad (_("Local symbol %s never defined"),
S_GET_NAME (symbolP));
} /* Oops. */
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/* Unhook it from the chain. */
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*symbolPP = symbol_next (symbolP);
} /* if this symbol should be in the output */
} /* for each symbol */
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H_SET_SYMBOL_TABLE_SIZE (headers, symbol_number);
}
/* Find strings by crawling along symbol table chain. */
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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));
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#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. */
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}