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

/* b.out object file format
   Copyright (C) 1989, 1990, 1991, 1992 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, 675 Mass Ave, Cambridge, MA 02139, USA. */

#include "as.h"
#include "obstack.h"
#include "aout/stab_gnu.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,			/* absent */
  N_UNDF,			/* pass1 */
  N_UNDF,			/* error */
  N_UNDF,			/* bignum/flonum */
  N_UNDF,			/* difference */
  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,
};

#if __STDC__ == 1
static void obj_bout_stab (int what);
static void obj_bout_line (void);
static void obj_bout_desc (void);
#else /* not __STDC__ */
static void obj_bout_desc ();
static void obj_bout_stab ();
static void obj_bout_line ();
#endif /* not __STDC__ */

const pseudo_typeS obj_pseudo_table[] =
{
/* stabs (aka a.out aka b.out directives for debug symbols) */
  {"desc", obj_bout_desc, 0},	/* def */
  {"line", obj_bout_line, 0},	/* source code line number */
  {"stabd", obj_bout_stab, 'd'},/* stabs */
  {"stabn", obj_bout_stab, 'n'},/* stabs */
  {"stabs", obj_bout_stab, 's'},/* stabs */

/* 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_addsy != NULL
	  || fixP->fx_r_type != NO_RELOC)
	{
	  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 *) &(S_GET_VALUE (symbolP)), S_GET_VALUE (symbolP), sizeof (S_GET_VALUE (symbolP)));

  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);
  return;
}				/* obj_symbol_new_hook() */

static void
obj_bout_line ()
{
  /* 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() */

/*
 *			stab()
 *
 * Handle .stabX directives, which used to be open-coded.
 * So much creeping featurism overloaded the semantics that we decided
 * to put all .stabX thinking in one place. Here.
 *
 * We try to make any .stabX directive legal. Other people's AS will often
 * do assembly-time consistency checks: eg assigning meaning to n_type bits
 * and "protecting" you from setting them to certain values. (They also zero
 * certain bits before emitting symbols. Tut tut.)
 *
 * If an expression is not absolute we either gripe or use the relocation
 * information. Other people's assemblers silently forget information they
 * don't need and invent information they need that you didn't supply.
 *
 * .stabX directives always make a symbol table entry. It may be junk if
 * the rest of your .stabX directive is malformed.
 */
static void
obj_bout_stab (what)
     int what;
{
  register symbolS *symbolP = 0;
  register char *string;
  int saved_type = 0;
  int length;
  int goof;			/* TRUE if we have aborted. */
  long longint;

  /*
	 * Enter with input_line_pointer pointing past .stabX and any following
	 * whitespace.
	 */
  goof = 0;			/* JF who forgot this?? */
  if (what == 's')
    {
      string = demand_copy_C_string (&length);
      SKIP_WHITESPACE ();
      if (*input_line_pointer == ',')
	input_line_pointer++;
      else
	{
	  as_bad ("I need a comma after symbol's name");
	  goof = 1;
	}
    }
  else
    string = "";

  /*
	 * Input_line_pointer->after ','.  String->symbol name.
	 */
  if (!goof)
    {
      symbolP = symbol_new (string,
			    SEG_UNKNOWN,
			    0,
			    (struct frag *) 0);
      switch (what)
	{
	case 'd':
	  S_SET_NAME (symbolP, NULL);	/* .stabd feature. */
	  S_SET_VALUE (symbolP, obstack_next_free (&frags) -
		       frag_now->fr_literal);
	  symbolP->sy_frag = frag_now;
	  break;

	case 'n':
	  symbolP->sy_frag = &zero_address_frag;
	  break;

	case 's':
	  symbolP->sy_frag = &zero_address_frag;
	  break;

	default:
	  BAD_CASE (what);
	  break;
	}
      if (get_absolute_expression_and_terminator (&longint) == ',')
	symbolP->sy_symbol.n_type = saved_type = longint;
      else
	{
	  as_bad ("I want a comma after the n_type expression");
	  goof = 1;
	  input_line_pointer--;	/* Backup over a non-',' char. */
	}
    }
  if (!goof)
    {
      if (get_absolute_expression_and_terminator (&longint) == ',')
	S_SET_OTHER (symbolP, longint);
      else
	{
	  as_bad ("I want a comma after the n_other expression");
	  goof = 1;
	  input_line_pointer--;	/* Backup over a non-',' char. */
	}
    }
  if (!goof)
    {
      S_SET_DESC (symbolP, get_absolute_expression ());
      if (what == 's' || what == 'n')
	{
	  if (*input_line_pointer != ',')
	    {
	      as_bad ("I want a comma after the n_desc expression");
	      goof = 1;
	    }
	  else
	    {
	      input_line_pointer++;
	    }
	}
    }
  if ((!goof) && (what == 's' || what == 'n'))
    {
      pseudo_set (symbolP);
      symbolP->sy_symbol.n_type = saved_type;
    }
#ifndef NO_LISTING
  {
    extern int listing;

    if (listing && !goof)
      {
	if (symbolP->sy_symbol.n_type == N_SLINE)
	  {

	    listing_source_line (symbolP->sy_symbol.n_desc);
	  }
	else if (symbolP->sy_symbol.n_type == N_SO
		 || symbolP->sy_symbol.n_type == N_SOL)
	  {
	    listing_source_file (string);
	  }
      }
  }

#endif

  if (goof)
    ignore_rest_of_line ();
  else
    demand_empty_rest_of_line ();
}				/* obj_bout_stab() */

static void
obj_bout_desc ()
{
  register char *name;
  register char c;
  register char *p;
  register symbolS *symbolP;
  register int temp;

  /*
	 * Frob invented at RMS' request. Set the n_desc of a symbol.
	 */
  name = input_line_pointer;
  c = get_symbol_end ();
  p = input_line_pointer;
  *p = c;
  SKIP_WHITESPACE ();
  if (*input_line_pointer != ',')
    {
      *p = 0;
      as_bad ("Expected comma after name \"%s\"", name);
      *p = c;
      ignore_rest_of_line ();
    }
  else
    {
      input_line_pointer++;
      temp = get_absolute_expression ();
      *p = 0;
      symbolP = symbol_find_or_make (name);
      *p = c;
      S_SET_DESC (symbolP, temp);
    }
  demand_empty_rest_of_line ();
}				/* obj_bout_desc() */

void
obj_read_begin_hook ()
{
  return;
}				/* obj_read_begin_hook() */

void
obj_crawl_symbol_chain (headers)
     object_headers *headers;
{
  symbolS **symbolPP;
  symbolS *symbolP;
  int symbol_number = 0;

  /* JF deal with forward references first... */
  for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP))
    {
      if (symbolP->sy_forward)
	{
	  S_SET_VALUE (symbolP, S_GET_VALUE (symbolP)
		       + S_GET_VALUE (symbolP->sy_forward)
		       + symbolP->sy_forward->sy_frag->fr_address);

	  symbolP->sy_forward = 0;
	}			/* if it has a forward reference */
    }				/* walk the symbol chain */

  tc_crawl_symbol_chain (headers);

  symbolPP = &symbol_rootP;	/*->last symbol chain link. */
  while ((symbolP = *symbolPP) != NULL)
    {
      if (flagseen['R'] && (S_GET_SEGMENT (symbolP) == SEG_DATA))
	{
	  S_SET_SEGMENT (symbolP, SEG_TEXT);
	}			/* if pusing data into text */

      S_SET_VALUE (symbolP, S_GET_VALUE (symbolP) + symbolP->sy_frag->fr_address);

      /* 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' && (flagseen['L'] || !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);

  return;
}				/* obj_crawl_symbol_chain() */

/*
 * 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 */

  return;
}				/* obj_emit_strings() */

/* end of obj-bout.c */