path: root/ld/emultempl/sunos.em

# This shell script emits a C file. -*- C -*-
# It does some substitutions.
cat >e${EMULATION_NAME}.c <<EOF
/* This file is is generated by a shell script.  DO NOT EDIT! */

/* SunOS emulation code for ${EMULATION_NAME}
   Copyright (C) 1991, 1993, 1994 Free Software Foundation, Inc.
   Written by Steve Chamberlain <sac@cygnus.com>
   SunOS shared library support by Ian Lance Taylor <ian@cygnus.com>

This file is part of GLD, the Gnu Linker.

This program 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 of the License, or
(at your option) any later version.

This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#define TARGET_IS_${EMULATION_NAME}

#include <sys/types.h>
#include <sys/stat.h>

/* FIXME: On some hosts we will need to include a different file.
   This is correct for SunOS, which is the only place this file will
   typically be compiled.  However, if somebody configures the linker
   for all targets, they will run into trouble here.  */
#include <dirent.h>

#include "bfd.h"
#include "sysdep.h"
#include "bfdlink.h"

#include "ld.h"
#include "config.h"
#include "ldmain.h"
#include "ldemul.h"
#include "ldfile.h"
#include "ldmisc.h"
#include "ldexp.h"
#include "ldlang.h"

static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
static void gld${EMULATION_NAME}_create_output_section_statements
  PARAMS ((void));
static void gld${EMULATION_NAME}_find_so
  PARAMS ((lang_input_statement_type *));
static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
static void gld${EMULATION_NAME}_find_statement_assignment
  PARAMS ((lang_statement_union_type *));
static void gld${EMULATION_NAME}_find_exp_assignment PARAMS ((etree_type *));
static void gld${EMULATION_NAME}_count_need
  PARAMS ((lang_input_statement_type *));
static void gld${EMULATION_NAME}_set_need
  PARAMS ((lang_input_statement_type *));
static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));

static void
gld${EMULATION_NAME}_before_parse()
{
  ldfile_output_architecture = bfd_arch_${ARCH};
  config.dynamic_link = true;
}

/* Despite the name, we use this routine to search for dynamic
   libraries.  On SunOS this requires a directory search.  We need to
   find the .so file with the highest version number.  The user may
   restrict the major version by saying, e.g., -lc.1.  Also, if we
   find a .so file, we need to look for a the same file after
   replacing .so with .sa; if it exists, it will be an archive which
   provide some initializations for data symbols, and we need to
   search it after including the .so file.  */

static void
gld${EMULATION_NAME}_create_output_section_statements ()
{
  if (config.dynamic_link)
    lang_for_each_input_file (gld${EMULATION_NAME}_find_so);
}

/* Search the directory for a .so file for each library search.  */

static void
gld${EMULATION_NAME}_find_so (inp)
     lang_input_statement_type *inp;
{
  search_dirs_type *search;
  const char *filename;
  const char *dot;
  int force_maj;
  unsigned int len;
  char *alc;
  int max_maj, max_min;
  char *found;
  struct stat st;

  if (! inp->search_dirs_flag
      || ! inp->is_archive)
    return;

  ASSERT (strncmp (inp->local_sym_name, "-l", 2) == 0);

  filename = inp->filename;
  force_maj = -1;
  dot = strchr (filename, '.');
  if (dot == NULL)
    len = strlen (filename);
  else
    {
      len = dot - filename;
      alc = (char *) alloca (len + 1);
      strncpy (alc, filename, len);
      alc[len] = '\0';
      filename = alc;
    }

  found = NULL;
  max_maj = max_min = 0;
  for (search = search_head; search != NULL; search = search->next)
    {
      DIR *dir;
      struct dirent *entry;

      dir = opendir (search->name);
      if (dir == NULL)
	continue;
  
      while ((entry = readdir (dir)) != NULL)
	{
	  int found_maj, found_min;

	  if (strncmp (entry->d_name, "lib", 3) != 0
	      || strncmp (entry->d_name + 3, inp->filename, len) != 0
	      || strncmp (entry->d_name + 3 + len, ".so", 3) != 0)
	    continue;

	  /* We've found a .so file.  Work out the major and minor
	     version numbers.  */
	  found_maj = 0;
	  found_min = 0;
	  sscanf (entry->d_name + 3 + len, ".so.%d.%d",
		  &found_maj, &found_min);

	  if (force_maj != -1 && force_maj != found_maj)
	    continue;

	  /* We've found a match for the name we are searching for.
	     See if this is the version we should use.  If the major
	     and minor versions match, we use the last entry in
	     alphabetical order; I don't know if this is how SunOS
	     distinguishes libc.so.1.8 from libc.so.1.8.1, but it
	     ought to suffice.  */
	  if (found == NULL
	      || (found_maj > max_maj)
	      || (found_maj == max_maj
		  && (found_min > max_min
		      || (found_min == max_min
			  && strcmp (entry->d_name, found) > 0))))
	    {
	      if (found != NULL)
		free (found);
	      found = (char *) xmalloc (strlen (entry->d_name) + 1);
	      strcpy (found, entry->d_name);
	      max_maj = found_maj;
	      max_min = found_min;
	    }
	}

      closedir (dir);

      if (found != NULL)
	break;
    }

  if (found == NULL)
    {
      /* We did not find a matching .so file.  This isn't an error,
	 since there might still be a matching .a file, which will be
	 found by the usual search.  */
      return;
    }

  /* Replace the filename with the one we have found.  */
  alc = (char *) xmalloc (strlen (search->name) + strlen (found) + 2);
  sprintf (alc, "%s/%s", search->name, found);
  inp->filename = alc;

  /* Turn off the search_dirs_flag to prevent ldfile_open_file from
     searching for this file again.  */
  inp->search_dirs_flag = false;

  free (found);

  /* Now look for the same file name, but with .sa instead of .so.  If
     found, add it to the list of input files.  */
  alc = (char *) alloca (strlen (inp->filename) + 1);
  strcpy (alc, inp->filename);
  strstr (alc, ".so.")[2] = 'a';
  if (stat (alc, &st) == 0)
    {
      lang_input_statement_type *sa;
      char *a;

      /* Add the .sa file to the statement list just after the .so
	 file.  This is really a hack.  */
      sa = ((lang_input_statement_type *)
	    xmalloc (sizeof (lang_input_statement_type)));
      sa->header.next = inp->header.next;
      sa->header.type = lang_input_statement_enum;
      a = (char *) xmalloc (strlen (alc) + 1);
      strcpy (a, alc);
      sa->filename = a;
      sa->local_sym_name = a;
      sa->the_bfd = NULL;
      sa->asymbols = NULL;
      sa->symbol_count = 0;
      sa->next = NULL;
      sa->next_real_file = inp->next_real_file;
      sa->is_archive = false;
      sa->search_dirs_flag = false;
      sa->just_syms_flag = false;
      sa->loaded = false;
      sa->real = true;
      sa->complained = false;

      /* Put the new statement next on the list of statements and next
	 on the list of input files.  */
      inp->header.next = (lang_statement_union_type *) sa;
      inp->next_real_file = (lang_statement_union_type *) sa;
    }
}

/* We need to use static variables to pass information around the call
   to lang_for_each_input_file.  Ick.  */

static bfd_size_type need_size;
static bfd_size_type need_entries;
static bfd_byte *need_contents;
static bfd_byte *need_pinfo;
static bfd_byte *need_pnames;

/* The size of one entry in the .need section, not including the file
   name.  */

#define NEED_ENTRY_SIZE (16)

/* This is called after the sections have been attached to output
   sections, but before any sizes or addresses have been set.  */

static void
gld${EMULATION_NAME}_before_allocation ()
{
  struct bfd_link_hash_entry *h = NULL;
  asection *sneed;
  asection *srules;
  asection *sdyn;

  /* We need to create a __DYNAMIC symbol.  We don't do this in the
     linker script because we want to set the value to the start of
     the dynamic section if there is one, or to zero if there isn't
     one.  We need to create the symbol before calling
     size_dynamic_sections, although we can't set the value until
     afterward.  */
  if (! link_info.relocateable)
    {
      h = bfd_link_hash_lookup (link_info.hash, "__DYNAMIC", true, false,
				false);
      if (h == NULL)
	einfo ("%P%F: bfd_link_hash_lookup: %E\n");
      if (! bfd_sunos_record_link_assignment (output_bfd, &link_info,
					      "__DYNAMIC"))
	einfo ("%P%F: failed to record assignment to __DYNAMIC: %E\n");
    }

  /* If we are going to make any variable assignments, we need to let
     the backend linker know about them in case the variables are
     referred to by dynamic objects.  */
  lang_for_each_statement (gld${EMULATION_NAME}_find_statement_assignment);

  /* Let the backend linker work out the sizes of any sections
     required by dynamic linking.  */
  if (! bfd_sunos_size_dynamic_sections (output_bfd, &link_info, &sdyn,
					 &sneed, &srules))
    einfo ("%P%F: failed to set dynamic section sizes: %E\n");

  if (sneed != NULL)
    {
      /* Set up the .need section.  See the description of the ld_need
	 field in include/aout/sun4.h.  */

      need_entries = 0;
      need_size = 0;

      lang_for_each_input_file (gld${EMULATION_NAME}_count_need);

      /* We should only have a .need section if we have at least one
	 dynamic object.  */
      ASSERT (need_entries != 0);

      sneed->_raw_size = need_size;
      sneed->contents = (bfd_byte *) xmalloc (need_size);

      need_contents = sneed->contents;
      need_pinfo = sneed->contents;
      need_pnames = sneed->contents + need_entries * 16;

      lang_for_each_input_file (gld${EMULATION_NAME}_set_need);

      ASSERT (need_pnames - sneed->contents == need_size);
    }

  if (srules != NULL)
    {
      unsigned int size;
      search_dirs_type *search;

      /* Set up the .rules section.  This is just a PATH like string
	 of the -L arguments given on the command line.  */
      size = 0;
      for (search = search_head; search != NULL; search = search->next)
	if (search->cmdline)
	  size += strlen (search->name) + 1;
      srules->_raw_size = size;
      if (size > 0)
	{
	  char *p;

	  srules->contents = (bfd_byte *) xmalloc (size);
	  p = (char *) srules->contents;
	  *p = '\0';
	  for (search = search_head; search != NULL; search = search->next)
	    {
	      if (search->cmdline)
		{
		  if (p != (char *) srules->contents)
		    *p++ = ':';
		  strcpy (p, search->name);
		  p += strlen (p);
		}
	    }
	}
    }

  /* We must assign a value to __DYNAMIC.  It should be zero if we are
     not doing a dynamic link, or the start of the .dynamic section if
     we are doing one.  */
  if (! link_info.relocateable)
    {
      h->type = bfd_link_hash_defined;
      h->u.def.value = 0;
      if (sdyn != NULL)
	h->u.def.section = sdyn;
      else
	h->u.def.section = &bfd_abs_section;
    }
}

/* This is called by the before_allocation routine via
   lang_for_each_statement.  It locates any assignment statements, and
   tells the backend linker about them, in case they are assignments
   to symbols which are referred to by dynamic objects.  */

static void
gld${EMULATION_NAME}_find_statement_assignment (s)
     lang_statement_union_type *s;
{
  if (s->header.type == lang_assignment_statement_enum)
    gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp);
}

/* Look through an expression for an assignment statement.  */

static void
gld${EMULATION_NAME}_find_exp_assignment (exp)
     etree_type *exp;
{
  switch (exp->type.node_class)
    {
    case etree_assign:
      if (strcmp (exp->assign.dst, ".") != 0)
	{
	  if (! bfd_sunos_record_link_assignment (output_bfd, &link_info,
						  exp->assign.dst))
	    einfo ("%P%F: failed to record assignment to %s: %E\n",
		   exp->assign.dst);
	}
      gld${EMULATION_NAME}_find_exp_assignment (exp->assign.src);
      break;

    case etree_binary:
      gld${EMULATION_NAME}_find_exp_assignment (exp->binary.lhs);
      gld${EMULATION_NAME}_find_exp_assignment (exp->binary.rhs);
      break;

    case etree_trinary:
      gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
      gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
      gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.rhs);
      break;

    case etree_unary:
      gld${EMULATION_NAME}_find_exp_assignment (exp->unary.child);
      break;

    default:
      break;
    }
}

/* Work out the size of the .need section, and the number of entries.
   The backend will set the ld_need field of the dynamic linking
   information to point to the .need section.  See include/aout/sun4.h
   for more information.  */

static void
gld${EMULATION_NAME}_count_need (inp)
     lang_input_statement_type *inp;
{
  if (inp->the_bfd != NULL
      && (inp->the_bfd->flags & DYNAMIC) != 0)
    {
      ++need_entries;
      need_size += NEED_ENTRY_SIZE;
      if (! inp->is_archive)
	need_size += strlen (inp->filename) + 1;
      else
	{
	  ASSERT (inp->local_sym_name[0] == '-'
		  && inp->local_sym_name[1] == 'l');
	  need_size += strlen (inp->local_sym_name + 2) + 1;
	}
    }
}

/* Fill in the contents of the .need section.  */

static void
gld${EMULATION_NAME}_set_need (inp)
     lang_input_statement_type *inp;
{
  if (inp->the_bfd != NULL
      && (inp->the_bfd->flags & DYNAMIC) != 0)
    {
      bfd_size_type c;

      /* To really fill in the .need section contents, we need to know
	 the final file position of the section, but we don't.
	 Instead, we use offsets, and rely on the BFD backend to
	 finish the section up correctly.  FIXME: Talk about lack of
	 referential locality.  */
      bfd_put_32 (output_bfd, need_pnames - need_contents, need_pinfo);
      if (! inp->is_archive)
	{
	  bfd_put_32 (output_bfd, (bfd_vma) 0, need_pinfo + 4);
	  bfd_put_16 (output_bfd, (bfd_vma) 0, need_pinfo + 8);
	  bfd_put_16 (output_bfd, (bfd_vma) 0, need_pinfo + 10);
	  strcpy (need_pnames, inp->filename);
	}
      else
	{
	  char *verstr;
	  int maj, min;

	  bfd_put_32 (output_bfd, (bfd_vma) 0x80000000, need_pinfo + 4);
	  maj = 0;
	  min = 0;
	  verstr = strstr (inp->filename, ".so.");
	  if (verstr != NULL)
	    sscanf (verstr, ".so.%d.%d", &maj, &min);
	  bfd_put_16 (output_bfd, (bfd_vma) maj, need_pinfo + 8);
	  bfd_put_16 (output_bfd, (bfd_vma) min, need_pinfo + 10);
	  strcpy (need_pnames, inp->local_sym_name + 2);
	}

      c = (need_pinfo - need_contents) / NEED_ENTRY_SIZE;
      if (c + 1 >= need_entries)
	bfd_put_32 (output_bfd, (bfd_vma) 0, need_pinfo + 12);
      else
	bfd_put_32 (output_bfd, (bfd_vma) (c + 1) * NEED_ENTRY_SIZE,
		    need_pinfo + 12);

      need_pinfo += NEED_ENTRY_SIZE;
      need_pnames += strlen (need_pnames) + 1;
    }
}

static char *
gld${EMULATION_NAME}_get_script(isfile)
     int *isfile;
EOF

if test -n "$COMPILE_IN"
then
# Scripts compiled in.

# sed commands to quote an ld script as a C string.
sc='s/["\\]/\\&/g
s/$/\\n\\/
1s/^/"/
$s/$/n"/
'

cat >>e${EMULATION_NAME}.c <<EOF
{			     
  *isfile = 0;

  if (link_info.relocateable == true && config.build_constructors == true)
    return `sed "$sc" ldscripts/${EMULATION_NAME}.xu`;
  else if (link_info.relocateable == true)
    return `sed "$sc" ldscripts/${EMULATION_NAME}.xr`;
  else if (!config.text_read_only)
    return `sed "$sc" ldscripts/${EMULATION_NAME}.xbn`;
  else if (!config.magic_demand_paged)
    return `sed "$sc" ldscripts/${EMULATION_NAME}.xn`;
  else
    return `sed "$sc" ldscripts/${EMULATION_NAME}.x`;
}
EOF

else
# Scripts read from the filesystem.

cat >>e${EMULATION_NAME}.c <<EOF
{			     
  *isfile = 1;

  if (link_info.relocateable == true && config.build_constructors == true)
    return "ldscripts/${EMULATION_NAME}.xu";
  else if (link_info.relocateable == true)
    return "ldscripts/${EMULATION_NAME}.xr";
  else if (!config.text_read_only)
    return "ldscripts/${EMULATION_NAME}.xbn";
  else if (!config.magic_demand_paged)
    return "ldscripts/${EMULATION_NAME}.xn";
  else
    return "ldscripts/${EMULATION_NAME}.x";
}
EOF

fi

cat >>e${EMULATION_NAME}.c <<EOF

struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation = 
{
  gld${EMULATION_NAME}_before_parse,
  syslib_default,
  hll_default,
  after_parse_default,
  after_allocation_default,
  set_output_arch_default,
  ldemul_default_target,
  gld${EMULATION_NAME}_before_allocation,
  gld${EMULATION_NAME}_get_script,
  "${EMULATION_NAME}",
  "${OUTPUT_FORMAT}",
  0, /* finish */
  gld${EMULATION_NAME}_create_output_section_statements
};
EOF