Add support for ELF shared libraries.

	* ld.h (ld_config_type): Add field dynamic_link.
	* ldmain.c (main): Initialize config.dynamic_link to false.  Warn
	on attempts to use -r with -relax, -call_shared or -s.
	* lexsup.c (longopts): Separate OPTION_CALL_SHARED from
	OPTION_NON_SHARED.  Add OPTION_IGNORE.  Adjust macro values
	accordingly.  Add "dy" and "non_shared" options.  Change "Qy" to
	OPTION_IGNORE for now.  Handle OPTION_CALL_SHARED and
	OPTION_NON_SHARED by setting dynamic_link field accordingly.
	Handle OPTION_IGNORE by ignoring it.  Clear dynamic_link field for
	-r and -Ur.
	* ldfile.c (ldfile_open_file): If config.dynamic_link is true, try
	opening a file with a .so extension first.
	* emultempl/elf32.em: New file.
	* emulparams/elf32_sparc.sh (TEXT_START_ADDR): Change to 0x10000.
	(NONPAGED_TEXT_START_ADDR): Likewise.
	(TEMPLATE_NAME): Define as elf32.
	(DATA_PLT): Define.
	* emulparams/elf_i386.sh (TEMPLATE_NAME): Define as elf32.
	* scripttempl/elf.sc: Add placement for new dynamic sections.
	Don't use CREATE_OBJECT_SYMBOLS.  Define _etext, _edata and _end
	outside of any section.  Don't use ALIGN(8); just let one section
	VMA follow another.  Put .dynbss in .bss.  Don't mention debugging
	sections; they'll be handled correctly anyhow.
	* Makefile.in (eelf_i386.c): Depend upon elf32.em, not generic.em.

2 files changed, 197 insertions, 0 deletions

diff --git a/ld/emultempl/.Sanitize b/ld/emultempl/.Sanitize
index 18e6d03..c0f5649 100644
--- a/ld/emultempl/.Sanitize
+++ b/ld/emultempl/.Sanitize
@@ -25,6 +25,7 @@ Do-first:
 Things-to-keep:
 
 README
+elf32.em
 generic.em
 gld960.em
 gld960c.em
diff --git a/ld/emultempl/elf32.em b/ld/emultempl/elf32.em
new file mode 100644
index 0000000..1ce59dd
--- /dev/null
+++ b/ld/emultempl/elf32.em
@@ -0,0 +1,196 @@
+# 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! */
+
+/* 32 bit ELF emulation code for ${EMULATION_NAME}
+   Copyright (C) 1991, 1993, 1994 Free Software Foundation, Inc.
+   Written by Steve Chamberlain <sac@cygnus.com>
+   ELF support by Ian Lance Taylor <ian@cygnus.com>
+
+This file is part of GLD, the Gnu Linker.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#define TARGET_IS_${EMULATION_NAME}
+
+#include "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}_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 char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
+
+static void
+gld${EMULATION_NAME}_before_parse()
+{
+  ldfile_output_architecture = bfd_arch_${ARCH};
+  config.dynamic_link = true;
+}
+
+/* This is called after the sections have been attached to output
+   sections, but before any sizes or addresses have been set.  */
+
+static void
+gld${EMULATION_NAME}_before_allocation ()
+{
+  /* If we are going to make any variable assignments, we need to let
+     the ELF backend know about them in case the variables are
+     referred to by dynamic objects.  */
+  lang_for_each_statement (gld${EMULATION_NAME}_find_statement_assignment);
+
+  /* Let the ELF backend work out the sizes of any sections required
+     by dynamic linking.  */
+  if (! bfd_elf32_size_dynamic_sections (output_bfd, &link_info))
+    einfo ("%P%F: failed to set dynamic section sizes: %E\n");
+}
+
+/* This is called by the before_allocation routine via
+   lang_for_each_statement.  It locates any assignment statements, and
+   tells the ELF backend about them, in case they are assignments to
+   symbols which are referred to by dynamic objects.  */
+
+static void
+gld${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_elf32_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${EMULATION_NAME}_find_exp_assignment (exp->unary.child);
+      break;
+
+    default:
+      break;
+    }
+}
+
+static char *
+gld${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}"
+};
+EOF