Thu Jun 16 14:25:22 1994 Eric Youngdale (ericy@cais.cais.com)

	* emultempl/linux.em: New file providing support for linking
	against Linux shared libraries.
	* config/i386-linux.mt (ei386linux.c): Depend upon linux.em.
	* emulparams/i386linux.sh (TEMPLATE_NAME): Define as linux.

2 files changed, 156 insertions, 0 deletions

diff --git a/ld/emultempl/.Sanitize b/ld/emultempl/.Sanitize
index b4bab8b..7261d4a 100644
--- a/ld/emultempl/.Sanitize
+++ b/ld/emultempl/.Sanitize
@@ -31,6 +31,7 @@ generic.em
 gld960.em
 gld960c.em
 hppaelf.em
+linux.em
 lnk960.em
 m88kbcs.em
 sunos.em
diff --git a/ld/emultempl/linux.em b/ld/emultempl/linux.em
new file mode 100644
index 0000000..013a8eb
--- /dev/null
+++ b/ld/emultempl/linux.em
@@ -0,0 +1,155 @@
+# 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! */
+
+/* Linux a.out emulation code for ${EMULATION_NAME}
+   Copyright (C) 1991, 1993, 1994 Free Software Foundation, Inc.
+   Written by Steve Chamberlain <sac@cygnus.com>
+   Linux support by Eric Youngdale <ericy@cais.cais.com>
+
+This file is part of GLD, the Gnu Linker.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#define TARGET_IS_${EMULATION_NAME}
+
+#include "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${EMULATION_NAME}_before_parse PARAMS ((void));
+static boolean gld${EMULATION_NAME}_open_dynamic_archive
+  PARAMS ((const char *, lang_input_statement_type *));
+static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
+static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
+
+static void
+gld${EMULATION_NAME}_before_parse()
+{
+  ldfile_output_architecture = bfd_arch_${ARCH};
+  config.dynamic_link = true;
+}
+
+/* Try to open a dynamic archive.  This is where we know that Linux
+   dynamic libraries have an extension of .sa.  */
+
+static boolean
+gld${EMULATION_NAME}_open_dynamic_archive (arch, entry)
+     const char *arch;
+     lang_input_statement_type *entry;
+{
+  return ldfile_open_file_search (arch, entry, "lib", ".sa");
+}
+
+/* This is called after the sections have been attached to output
+   sections, but before any sizes or addresses have been set.  */
+
+static void
+gld${EMULATION_NAME}_before_allocation ()
+{
+  if (link_info.relocateable)
+    return;
+
+  /* Let the backend work out the sizes of any sections required by
+     dynamic linking.  */
+  if (! bfd_linux_size_dynamic_sections (output_bfd, &link_info))
+    einfo ("%P%F: failed to set dynamic section sizes: %E\n");
+}
+
+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}",
+  "${OUTPUT_FORMAT}",
+  NULL,
+  NULL,
+  gld${EMULATION_NAME}_open_dynamic_archive
+};
+EOF