Nios II CALL26 linker relaxation

2014-01-30  Sandra Loosemore  <sandra@codesourcery.com>

	bfd/
	* bfd-in2.h: Update from reloc.c.
	* elf32-nios2.c: Include elf32-nios2.h.
	(elf_nios2_howto_table_rel): Add entry for R_NIOS2_CALL26_NOAT.
	(nios2_reloc_map): Likewise.
	(enum elf32_nios2_stub_type): Declare.
	(struct elf32_nios2_stub_hash_entry): Declare.
	(nios2_stub_hash_entry, nios2_stub_hash_lookup): New macros.
	(struct elf32_nios2_link_hash_entry): Add hsh_cache field.
	(struct elf32_nios2_link_hash_table): Add new fields bstab,
	stub_bfd, add_stub_section, layout_sections_again, stub_group,
	bfd_count, top_index, input_list, all_local_syms.
	(nios2_call26_stub_entry): New.
	(nios2_elf32_install_imm16): Move up in file.
	(nios2_elf32_install_data): Move up in file.
	(hiadj): Move up in file.
	(stub_hash_newfunc): New.
	(link_hash_newfunc): Initialize hsh_cache field.
	(STUB_SUFFIX): New.
	(nios2_stub_name): New.
	(nios2_get_stub_entry): New.
	(nios2_add_stub): New.
	(nios2_elf32_setup_section_lists): New.
	(nios2_elf32_next_input_section): New.
	(CALL26_SEGMENT): New.
	(MAX_STUB_SECTION_SIZE): New.
	(group_sections): New.
	(nios2_type_of_stub): New.
	(nios2_build_one_stub): New.
	(nios2_size_one_stub): New.
	(get_local_syms): New.
	(nios2_elf32_size_stubs): New.
	(nios2_elf32_build_stubs): New.
	(nios2_elf32_do_call26_relocate): Correct CALL26 overflow test.
	(nios2_elf32_relocate_section): Handle R_NIOS2_CALL26_NOAT.  Add
	trampolines for R_NIOS2_CALL26 stubs.
	(nios2_elf32_check_relocs): Handle R_NIOS2_CALL26_NOAT.
	(nios2_elf32_gc_sweep_hook): Likewise.
	(nios2_elf32_link_hash_table_create): Initialize the stub hash table.
	(nios2_elf32_link_hash_table_free): New.
	(bfd_elf32_bfd_link_hash_table_free): Define.
	* elf32-nios2.h: New file.
	* libbfd.h: Update from reloc.c.
	* reloc.c (BFD_RELOC_NIOS2_CALL26_NOAT): New.

	gas/
	* config/tc-nios2.c (md_apply_fix): Handle BFD_RELOC_NIOS2_CALL26_NOAT.
	(nios2_assemble_args_m): Likewise.
	(md_assemble): Likewise.

	gas/testsuite/
	* gas/nios2/call26_noat.d: New.
	* gas/nios2/call26_noat.s: New.
	* gas/nios2/call_noat.d: New.
	* gas/nios2/call_noat.s: New.

	include/elf/
	* nios2.h (elf_nios2_reloc_type): Add R_NIOS2_CALL26_NOAT.

	ld/
	* Makefile.am (enios2elf.c, enios2linux.c): Update dependencies.
	* Makefile.in: Regenerated.
	* emulparams/nios2elf.sh (EXTRA_EM_FILE): Set.
	* emulparams/nios2linux.sh (EXTRA_EM_FILE): Set.
	* emultempl/nios2elf.em: New file.
	* gen-doc.texi (NIOSII): Set.
	* ld.texinfo (NIOSII): Set.

	ld/testsuite/
	* ld-nios2/relax_call26.s: New.
	* ld-nios2/relax_call26_boundary.ld: New.
	* ld-nios2/relax_call26_boundary.s: New.
	* ld-nios2/relax_call26_boundary_c8.d: New.
	* ld-nios2/relax_call26_boundary_cc.d: New.
	* ld-nios2/relax_call26_boundary_d0.d: New.
	* ld-nios2/relax_call26_boundary_d4.d: New.
	* ld-nios2/relax_call26_boundary_d8.d: New.
	* ld-nios2/relax_call26_boundary_dc.d: New.
	* ld-nios2/relax_call26_boundary_f0.d: New.
	* ld-nios2/relax_call26_boundary_f4.d: New.
	* ld-nios2/relax_call26_boundary_f8.d: New.
	* ld-nios2/relax_call26_boundary_fc.d: New.
	* ld-nios2/relax_call26_cache.d: New.
	* ld-nios2/relax_call26_cache.ld: New.
	* ld-nios2/relax_call26_cache.s: New.
	* ld-nios2/relax_call26_multi.d: New.
	* ld-nios2/relax_call26_multi.ld: New.
	* ld-nios2/relax_call26_norelax.d: New.
	* ld-nios2/relax_call26_shared.d: New.
	* ld-nios2/relax_call26_shared.ld: New.

30 files changed, 715 insertions, 6 deletions

diff --git a/ld/ChangeLog b/ld/ChangeLog
index b072ff9..e765743 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,13 @@
+2014-01-30  Sandra Loosemore  <sandra@codesourcery.com>
+
+	* Makefile.am (enios2elf.c, enios2linux.c): Update dependencies.
+	* Makefile.in: Regenerated.
+	* emulparams/nios2elf.sh (EXTRA_EM_FILE): Set.
+	* emulparams/nios2linux.sh (EXTRA_EM_FILE): Set.
+	* emultempl/nios2elf.em: New file.
+	* gen-doc.texi (NIOSII): Set.
+	* ld.texinfo (NIOSII): Set.
+
 2014-01-28  Nick Clifton  <nickc@redhat.com>
 
 	* Makefile.am: Remove obsolete MSP430 emulations.
diff --git a/ld/Makefile.am b/ld/Makefile.am
index 3499e72..5968668 100644
--- a/ld/Makefile.am
+++ b/ld/Makefile.am
@@ -1497,10 +1497,12 @@ enews.c: $(srcdir)/emulparams/news.sh \
   $(srcdir)/emultempl/generic.em $(srcdir)/scripttempl/aout.sc ${GEN_DEPENDS}
 	${GENSCRIPTS} news "$(tdir_news)"
 enios2elf.c: $(srcdir)/emulparams/nios2elf.sh \
-  $(ELF_DEPS) $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
+  $(srcdir)/emultempl/elf32.em $(srcdir)/emultempl/nios2elf.em \
+  $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
 	${GENSCRIPTS} nios2elf "$(tdir_nios2elf)"
 enios2linux.c: $(srcdir)/emulparams/nios2linux.sh \
-  $(ELF_DEPS) $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
+  $(srcdir)/emultempl/elf32.em $(srcdir)/emultempl/nios2elf.em \
+  $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
 	${GENSCRIPTS} nios2linux "$(tdir_nios2linux)"
 ens32knbsd.c:	$(srcdir)/emulparams/ns32knbsd.sh \
   $(srcdir)/emultempl/generic.em $(srcdir)/emultempl/netbsd.em \
diff --git a/ld/Makefile.in b/ld/Makefile.in
index 0119a74..59cba73 100644
--- a/ld/Makefile.in
+++ b/ld/Makefile.in
@@ -2929,10 +2929,12 @@ enews.c: $(srcdir)/emulparams/news.sh \
   $(srcdir)/emultempl/generic.em $(srcdir)/scripttempl/aout.sc ${GEN_DEPENDS}
 	${GENSCRIPTS} news "$(tdir_news)"
 enios2elf.c: $(srcdir)/emulparams/nios2elf.sh \
-  $(ELF_DEPS) $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
+  $(srcdir)/emultempl/elf32.em $(srcdir)/emultempl/nios2elf.em \
+  $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
 	${GENSCRIPTS} nios2elf "$(tdir_nios2elf)"
 enios2linux.c: $(srcdir)/emulparams/nios2linux.sh \
-  $(ELF_DEPS) $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
+  $(srcdir)/emultempl/elf32.em $(srcdir)/emultempl/nios2elf.em \
+  $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
 	${GENSCRIPTS} nios2linux "$(tdir_nios2linux)"
 ens32knbsd.c:	$(srcdir)/emulparams/ns32knbsd.sh \
   $(srcdir)/emultempl/generic.em $(srcdir)/emultempl/netbsd.em \
diff --git a/ld/emulparams/nios2elf.sh b/ld/emulparams/nios2elf.sh
index 767f3de..7ccde97 100644
--- a/ld/emulparams/nios2elf.sh
+++ b/ld/emulparams/nios2elf.sh
@@ -1,6 +1,6 @@
 SCRIPT_NAME=elf
 TEMPLATE_NAME=elf32
-EXTRA_EM_FILE=
+EXTRA_EM_FILE=nios2elf
 OUTPUT_FORMAT="elf32-littlenios2"
 LITTLE_OUTPUT_FORMAT="elf32-littlenios2"
 BIG_OUTPUT_FORMAT="elf32-bignios2"
diff --git a/ld/emulparams/nios2linux.sh b/ld/emulparams/nios2linux.sh
index aa409a9..f215177 100644
--- a/ld/emulparams/nios2linux.sh
+++ b/ld/emulparams/nios2linux.sh
@@ -1,6 +1,6 @@
 SCRIPT_NAME=elf
 TEMPLATE_NAME=elf32
-EXTRA_EM_FILE=
+EXTRA_EM_FILE="nios2elf"
 OUTPUT_FORMAT="elf32-littlenios2"
 LITTLE_OUTPUT_FORMAT="elf32-littlenios2"
 BIG_OUTPUT_FORMAT="elf32-bignios2"
diff --git a/ld/emultempl/nios2elf.em b/ld/emultempl/nios2elf.em
new file mode 100644
index 0000000..c86eba1
--- /dev/null
+++ b/ld/emultempl/nios2elf.em
@@ -0,0 +1,317 @@
+# This shell script emits a C file. -*- C -*-
+#   Copyright (C) 2013, 2014 Free Software Foundation, Inc.
+#
+# This file is part of GNU Binutils.
+#
+# 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
+# MA 02110-1301, USA.
+#
+
+# This file is sourced from elf32.em, and defines extra Nios II ELF
+# specific routines. Taken from metagelf.em.
+#
+fragment <<EOF
+
+#include "ldctor.h"
+#include "elf32-nios2.h"
+
+
+/* Fake input file for stubs.  */
+static lang_input_statement_type *stub_file;
+
+/* Whether we need to call nios2_layout_sections_again.  */
+static int need_laying_out = 0;
+
+
+/* This is called before the input files are opened.  We create a new
+   fake input file to hold the stub sections.  */
+
+static void
+nios2elf_create_output_section_statements (void)
+{
+  extern const bfd_target bfd_elf32_littlenios2_vec, bfd_elf32_bignios2_vec;
+
+  if (link_info.output_bfd->xvec != &bfd_elf32_littlenios2_vec
+      && link_info.output_bfd->xvec != &bfd_elf32_bignios2_vec)
+    return;
+
+  /* If --no-relax was not explicitly specified by the user, enable
+     relaxation.  If it's not enabled (either explicitly or by default),
+     we're done, as we won't need to create any stubs.  */
+  if (!link_info.relocatable && RELAXATION_DISABLED_BY_DEFAULT)
+    ENABLE_RELAXATION;
+  if (!RELAXATION_ENABLED)
+    return;
+
+  stub_file = lang_add_input_file ("linker stubs",
+				   lang_input_file_is_fake_enum,
+				   NULL);
+  stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
+  if (stub_file->the_bfd == NULL
+      || ! bfd_set_arch_mach (stub_file->the_bfd,
+			      bfd_get_arch (link_info.output_bfd),
+			      bfd_get_mach (link_info.output_bfd)))
+    {
+      einfo ("%X%P: can not create BFD %E\n");
+      return;
+    }
+
+  stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
+  ldlang_add_file (stub_file);
+}
+
+
+struct hook_stub_info
+{
+  lang_statement_list_type add;
+  asection *input_section;
+};
+
+/* Traverse the linker tree to find the spot where the stub goes.  */
+
+static bfd_boolean
+hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp,
+	      bfd_boolean afterp)
+{
+  lang_statement_union_type *l;
+  bfd_boolean ret;
+
+  for (; (l = *lp) != NULL; lp = &l->header.next)
+    {
+      switch (l->header.type)
+	{
+	case lang_constructors_statement_enum:
+	  ret = hook_in_stub (info, &constructor_list.head, afterp);
+	  if (ret)
+	    return ret;
+	  break;
+
+	case lang_output_section_statement_enum:
+	  ret = hook_in_stub (info,
+			      &l->output_section_statement.children.head,
+			      afterp);
+	  if (ret)
+	    return ret;
+	  break;
+
+	case lang_wild_statement_enum:
+	  ret = hook_in_stub (info, &l->wild_statement.children.head, afterp);
+	  if (ret)
+	    return ret;
+	  break;
+
+	case lang_group_statement_enum:
+	  ret = hook_in_stub (info, &l->group_statement.children.head, afterp);
+	  if (ret)
+	    return ret;
+	  break;
+
+	case lang_input_section_enum:
+	  if (l->input_section.section == info->input_section)
+	    {
+	      /* We've found our section.  Insert the stub immediately
+		 before or after its associated input section.  */
+	      if (afterp)
+		{
+		  *(info->add.tail) = l->header.next;
+		  l->header.next = info->add.head;
+		}
+	      else
+		{
+		  *lp = info->add.head;
+		  *(info->add.tail) = l;
+		}
+	      return TRUE;
+	    }
+	  break;
+
+	case lang_data_statement_enum:
+	case lang_reloc_statement_enum:
+	case lang_object_symbols_statement_enum:
+	case lang_output_statement_enum:
+	case lang_target_statement_enum:
+	case lang_input_statement_enum:
+	case lang_assignment_statement_enum:
+	case lang_padding_statement_enum:
+	case lang_address_statement_enum:
+	case lang_fill_statement_enum:
+	  break;
+
+	default:
+	  FAIL ();
+	  break;
+	}
+    }
+  return FALSE;
+}
+
+/* Call-back for elf32_nios2_size_stubs.  */
+
+/* Create a new stub section, and arrange for it to be linked
+   immediately before or after INPUT_SECTION, according to AFTERP.  */
+
+static asection *
+nios2elf_add_stub_section (const char *stub_sec_name, asection *input_section,
+			   bfd_boolean afterp)
+{
+  asection *stub_sec;
+  flagword flags;
+  asection *output_section;
+  const char *secname;
+  lang_output_section_statement_type *os;
+  struct hook_stub_info info;
+
+  flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
+	   | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
+  stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
+						 stub_sec_name, flags);
+  if (stub_sec == NULL)
+    goto err_ret;
+
+  output_section = input_section->output_section;
+  secname = bfd_get_section_name (output_section->owner, output_section);
+  os = lang_output_section_find (secname);
+
+  info.input_section = input_section;
+  lang_list_init (&info.add);
+  lang_add_section (&info.add, stub_sec, NULL, os);
+
+  if (info.add.head == NULL)
+    goto err_ret;
+
+  if (hook_in_stub (&info, &os->children.head, afterp))
+    return stub_sec;
+
+ err_ret:
+  einfo ("%X%P: can not make stub section: %E\n");
+  return NULL;
+}
+
+
+/* Another call-back for elf32_nios2_size_stubs.  */
+
+static void
+nios2elf_layout_sections_again (void)
+{
+  /* If we have changed sizes of the stub sections, then we need
+     to recalculate all the section offsets.  This may mean we need to
+     add even more stubs.  */
+  gld${EMULATION_NAME}_map_segments (TRUE);
+  need_laying_out = -1;
+}
+
+
+static void
+build_section_lists (lang_statement_union_type *statement)
+{
+  if (statement->header.type == lang_input_section_enum)
+    {
+      asection *i = statement->input_section.section;
+
+      if (i->sec_info_type != SEC_INFO_TYPE_JUST_SYMS
+	  && (i->flags & SEC_EXCLUDE) == 0
+	  && i->output_section != NULL
+	  && i->output_section->owner == link_info.output_bfd)
+	{
+	  nios2_elf32_next_input_section (&link_info, i);
+	}
+    }
+}
+
+
+/* For Nios II we use this opportunity to build linker stubs.  */
+
+static void
+gld${EMULATION_NAME}_after_allocation (void)
+{
+  /* bfd_elf_discard_info just plays with data and debugging sections,
+     ie. doesn't affect code size, so we can delay resizing the
+     sections.  It's likely we'll resize everything in the process of
+     adding stubs.  */
+  if (bfd_elf_discard_info (link_info.output_bfd, &link_info))
+    need_laying_out = 1;
+
+  /* If generating a relocatable output file, then we don't
+     have to examine the relocs.  */
+  if (stub_file != NULL && !link_info.relocatable && RELAXATION_ENABLED)
+    {
+      int ret = nios2_elf32_setup_section_lists (link_info.output_bfd,
+						 &link_info);
+
+      if (ret != 0)
+	{
+	  if (ret < 0)
+	    {
+	      einfo ("%X%P: can not size stub section: %E\n");
+	      return;
+	    }
+
+	  lang_for_each_statement (build_section_lists);
+
+	  /* Call into the BFD backend to do the real work.  */
+	  if (! nios2_elf32_size_stubs (link_info.output_bfd,
+					stub_file->the_bfd,
+					&link_info,
+					&nios2elf_add_stub_section,
+					&nios2elf_layout_sections_again))
+	    {
+	      einfo ("%X%P: can not size stub section: %E\n");
+	      return;
+	    }
+	}
+    }
+
+  if (need_laying_out != -1)
+    gld${EMULATION_NAME}_map_segments (need_laying_out);
+
+  if (!link_info.relocatable && RELAXATION_ENABLED)
+    {
+      /* Now build the linker stubs.  */
+      if (stub_file != NULL && stub_file->the_bfd->sections != NULL)
+	{
+	  if (! nios2_elf32_build_stubs (&link_info))
+	    einfo ("%X%P: can not build stubs: %E\n");
+	}
+    }
+}
+
+
+/* Avoid processing the fake stub_file in vercheck, stat_needed and
+   check_needed routines.  */
+
+static void (*real_func) (lang_input_statement_type *);
+
+static void nios2_for_each_input_file_wrapper (lang_input_statement_type *l)
+{
+  if (l != stub_file)
+    (*real_func) (l);
+}
+
+static void
+nios2_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
+{
+  real_func = func;
+  lang_for_each_input_file (&nios2_for_each_input_file_wrapper);
+}
+
+#define lang_for_each_input_file nios2_lang_for_each_input_file
+
+EOF
+
+
+# Put these extra nios2elf routines in ld_${EMULATION_NAME}_emulation
+#
+LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
+LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=nios2elf_create_output_section_statements
diff --git a/ld/gen-doc.texi b/ld/gen-doc.texi
index acc6c57..ede1e08 100644
--- a/ld/gen-doc.texi
+++ b/ld/gen-doc.texi
@@ -18,6 +18,7 @@
 @set MMIX
 @set MSP430
 @set NDS32
+@set NIOSII
 @set POWERPC
 @set POWERPC64
 @set Renesas
diff --git a/ld/ld.texinfo b/ld/ld.texinfo
index a8e5ea6..1287a6c 100644
--- a/ld/ld.texinfo
+++ b/ld/ld.texinfo
@@ -30,6 +30,7 @@
 @set MMIX
 @set MSP430
 @set NDS32
+@set NIOSII
 @set POWERPC
 @set POWERPC64
 @set Renesas
@@ -1605,6 +1606,9 @@ This option is only supported on a few targets.
 @ifset M68HC11
 @xref{M68HC11/68HC12,,@command{ld} and the 68HC11 and 68HC12}.
 @end ifset
+@ifset NIOSII
+@xref{Nios II,,@command{ld} and the Altera Nios II}.
+@end ifset
 @ifset POWERPC
 @xref{PowerPC ELF32,,@command{ld} and PowerPC 32-bit ELF Support}.
 @end ifset
@@ -6105,6 +6109,9 @@ functionality are not listed.
 @ifset NDS32
 * NDS32::			@command{ld} and NDS32
 @end ifset
+@ifset NIOSII
+* Nios II::			@command{ld} and the Altera Nios II
+@end ifset
 @ifset POWERPC
 * PowerPC ELF32::		@command{ld} and PowerPC 32-bit ELF Support
 @end ifset
@@ -6743,6 +6750,43 @@ Avoid generating the IFC instruction inside the loop.
 @end ifclear
 @end ifset
 
+@ifset NIOSII
+@ifclear GENERIC
+@raisesections
+@end ifclear
+
+@node Nios II
+@section @command{ld} and the Altera Nios II
+@cindex Nios II call relaxation
+@kindex --relax on Nios II
+
+Call and immediate jump instructions on Nios II processors are limited to
+transferring control to addresses in the same 256MB memory segment,
+which may result in @command{ld} giving
+@samp{relocation truncated to fit} errors with very large programs.
+The command-line option @option{--relax} enables the generation of
+trampolines that can access the entire 32-bit address space for calls
+outside the normal @code{call} and @code{jmpi} address range.  These
+trampolines are inserted at section boundaries, so may not themselves
+be reachable if an input section and its associated call trampolines are
+larger than 256MB.
+
+The @option{--relax} option is enabled by default unless @option{-r}
+is also specified.  You can disable trampoline generation by using the
+@option{--no-relax} linker option.  You can also disable this optimization
+locally by using the @samp{set .noat} directive in assembly-language
+source files, as the linker-inserted trampolines use the @code{at}
+register as a temporary.
+
+Note that the linker @option{--relax} option is independent of assembler
+relaxation options, and that using the GNU assembler's @option{-relax-all}
+option interferes with the linker's more selective call instruction relaxation.
+
+@ifclear GENERIC
+@lowersections
+@end ifclear
+@end ifset
+
 @ifset POWERPC
 @ifclear GENERIC
 @raisesections
diff --git a/ld/testsuite/ChangeLog b/ld/testsuite/ChangeLog
index 3cd1930..a46d25c 100644
--- a/ld/testsuite/ChangeLog
+++ b/ld/testsuite/ChangeLog
@@ -1,3 +1,27 @@
+2014-01-30  Sandra Loosemore  <sandra@codesourcery.com>
+
+	* ld-nios2/relax_call26.s: New.
+	* ld-nios2/relax_call26_boundary.ld: New.
+	* ld-nios2/relax_call26_boundary.s: New.
+	* ld-nios2/relax_call26_boundary_c8.d: New.
+	* ld-nios2/relax_call26_boundary_cc.d: New.
+	* ld-nios2/relax_call26_boundary_d0.d: New.
+	* ld-nios2/relax_call26_boundary_d4.d: New.
+	* ld-nios2/relax_call26_boundary_d8.d: New.
+	* ld-nios2/relax_call26_boundary_dc.d: New.
+	* ld-nios2/relax_call26_boundary_f0.d: New.
+	* ld-nios2/relax_call26_boundary_f4.d: New.
+	* ld-nios2/relax_call26_boundary_f8.d: New.
+	* ld-nios2/relax_call26_boundary_fc.d: New.
+	* ld-nios2/relax_call26_cache.d: New.
+	* ld-nios2/relax_call26_cache.ld: New.
+	* ld-nios2/relax_call26_cache.s: New.
+	* ld-nios2/relax_call26_multi.d: New.
+	* ld-nios2/relax_call26_multi.ld: New.
+	* ld-nios2/relax_call26_norelax.d: New.
+	* ld-nios2/relax_call26_shared.d: New.
+	* ld-nios2/relax_call26_shared.ld: New.
+
 2014-01-29  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* ld-elf/rdynamic-1.c: New file.
diff --git a/ld/testsuite/ld-nios2/relax_call26.s b/ld/testsuite/ld-nios2/relax_call26.s
new file mode 100644
index 0000000..b3b28df
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26.s
@@ -0,0 +1,27 @@
+# test for call26 relaxation via linker stubs
+
+.globl text0
+.section text0, "ax", @progbits
+	call func0	# in same section
+	call func1	# in nearby section
+	call func2a	# in distant section
+	jmpi func2b	# also in distant section
+
+func0:
+	ret
+
+.section text1, "ax", @progbits
+func1:
+	nop
+	nop
+	call func2a	# in distant section
+	ret
+
+.section text2, "ax", @progbits
+func2a:
+	nop
+	nop
+	nop
+	ret
+func2b:
+	nop
diff --git a/ld/testsuite/ld-nios2/relax_call26_boundary.ld b/ld/testsuite/ld-nios2/relax_call26_boundary.ld
new file mode 100644
index 0000000..313ef8c
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_boundary.ld
@@ -0,0 +1,14 @@
+/* Simple script for testing call26 relaxation via linker stubs.
+   This script is used for a bunch of tests that vary the placement of
+   section text0 near a 256 memory segment boundary, by using
+   --section-start command-line options.  */
+
+OUTPUT_FORMAT("elf32-littlenios2", "elf32-littlenios2", "elf32-littlenios2")
+OUTPUT_ARCH(nios2)
+ENTRY(_start)
+SECTIONS
+{
+	_start = .;
+	text0 : { *(text0) *(text1) }
+	text2 0x40000000 : { *(text2) }
+}
diff --git a/ld/testsuite/ld-nios2/relax_call26_boundary.s b/ld/testsuite/ld-nios2/relax_call26_boundary.s
new file mode 100644
index 0000000..ce79ebd
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_boundary.s
@@ -0,0 +1,29 @@
+# Test for call26 relaxation via linker stubs.
+# This .s file is used with several different linker scripts that vary the
+# placement of the sections in the output.
+# Section text0 is 32 bytes long and requires at least 2 linker stubs
+# (12 bytes each) to reach the call destinations in text2.  Another stub
+# may be required to reach func0 if the section is laid out so that it crosses 
+# a 256MB memory segment boundary.
+
+.globl text0
+.section text0, "ax", @progbits
+	call func0	# in same section
+	call func2a	# in distant section
+	nop
+	nop
+	nop
+	nop
+	jmpi func2b	# in distant section
+
+func0:
+	ret
+
+.section text2, "ax", @progbits
+func2a:
+	nop
+	nop
+	nop
+	ret
+func2b:
+	nop
diff --git a/ld/testsuite/ld-nios2/relax_call26_boundary_c8.d b/ld/testsuite/ld-nios2/relax_call26_boundary_c8.d
new file mode 100644
index 0000000..61fd858
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_boundary_c8.d
@@ -0,0 +1,9 @@
+#name: NIOS2 relax_call26_boundary_c8
+#ld: --relax -Trelax_call26_boundary.ld --section-start=text0=0x0fffffc8
+#source: relax_call26_boundary.s
+#objdump: -dr --prefix-addresses 
+# Test relaxation of call26 relocations via linker stubs.  We don't need to
+# check the exact layout of stubs for this test, only verify that it
+# links without "relocation truncated to fit" errors.
+
+#pass
diff --git a/ld/testsuite/ld-nios2/relax_call26_boundary_cc.d b/ld/testsuite/ld-nios2/relax_call26_boundary_cc.d
new file mode 100644
index 0000000..c3a571a
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_boundary_cc.d
@@ -0,0 +1,9 @@
+#name: NIOS2 relax_call26_boundary_cc
+#ld: --relax -Trelax_call26_boundary.ld --section-start=text0=0x0fffffcc
+#source: relax_call26_boundary.s
+#objdump: -dr --prefix-addresses 
+# Test relaxation of call26 relocations via linker stubs.  We don't need to
+# check the exact layout of stubs for this test, only verify that it
+# links without "relocation truncated to fit" errors.
+
+#pass
diff --git a/ld/testsuite/ld-nios2/relax_call26_boundary_d0.d b/ld/testsuite/ld-nios2/relax_call26_boundary_d0.d
new file mode 100644
index 0000000..67f28ce
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_boundary_d0.d
@@ -0,0 +1,9 @@
+#name: NIOS2 relax_call26_boundary_d0
+#ld: --relax -Trelax_call26_boundary.ld --section-start=text0=0x0fffffd0
+#source: relax_call26_boundary.s
+#objdump: -dr --prefix-addresses 
+# Test relaxation of call26 relocations via linker stubs.  We don't need to
+# check the exact layout of stubs for this test, only verify that it
+# links without "relocation truncated to fit" errors.
+
+#pass
diff --git a/ld/testsuite/ld-nios2/relax_call26_boundary_d4.d b/ld/testsuite/ld-nios2/relax_call26_boundary_d4.d
new file mode 100644
index 0000000..9ffdf0e
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_boundary_d4.d
@@ -0,0 +1,9 @@
+#name: NIOS2 relax_call26_boundary_d4
+#ld: --relax -Trelax_call26_boundary.ld --section-start=text0=0x0fffffd4
+#source: relax_call26_boundary.s
+#objdump: -dr --prefix-addresses 
+# Test relaxation of call26 relocations via linker stubs.  We don't need to
+# check the exact layout of stubs for this test, only verify that it
+# links without "relocation truncated to fit" errors.
+
+#pass
diff --git a/ld/testsuite/ld-nios2/relax_call26_boundary_d8.d b/ld/testsuite/ld-nios2/relax_call26_boundary_d8.d
new file mode 100644
index 0000000..168d532
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_boundary_d8.d
@@ -0,0 +1,9 @@
+#name: NIOS2 relax_call26_boundary_d8
+#ld: --relax -Trelax_call26_boundary.ld --section-start=text0=0x0fffffd8
+#source: relax_call26_boundary.s
+#objdump: -dr --prefix-addresses 
+# Test relaxation of call26 relocations via linker stubs.  We don't need to
+# check the exact layout of stubs for this test, only verify that it
+# links without "relocation truncated to fit" errors.
+
+#pass
diff --git a/ld/testsuite/ld-nios2/relax_call26_boundary_dc.d b/ld/testsuite/ld-nios2/relax_call26_boundary_dc.d
new file mode 100644
index 0000000..539051e
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_boundary_dc.d
@@ -0,0 +1,9 @@
+#name: NIOS2 relax_call26_boundary_dc
+#ld: --relax -Trelax_call26_boundary.ld --section-start=text0=0x0fffffdc
+#source: relax_call26_boundary.s
+#objdump: -dr --prefix-addresses 
+# Test relaxation of call26 relocations via linker stubs.  We don't need to
+# check the exact layout of stubs for this test, only verify that it
+# links without "relocation truncated to fit" errors.
+
+#pass
diff --git a/ld/testsuite/ld-nios2/relax_call26_boundary_f0.d b/ld/testsuite/ld-nios2/relax_call26_boundary_f0.d
new file mode 100644
index 0000000..fe83151
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_boundary_f0.d
@@ -0,0 +1,9 @@
+#name: NIOS2 relax_call26_boundary_f0
+#ld: --relax -Trelax_call26_boundary.ld --section-start=text0=0x0ffffff0
+#source: relax_call26_boundary.s
+#objdump: -dr --prefix-addresses 
+# Test relaxation of call26 relocations via linker stubs.  We don't need to
+# check the exact layout of stubs for this test, only verify that it
+# links without "relocation truncated to fit" errors.
+
+#pass
diff --git a/ld/testsuite/ld-nios2/relax_call26_boundary_f4.d b/ld/testsuite/ld-nios2/relax_call26_boundary_f4.d
new file mode 100644
index 0000000..4006ff2
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_boundary_f4.d
@@ -0,0 +1,9 @@
+#name: NIOS2 relax_call26_boundary_f4
+#ld: --relax -Trelax_call26_boundary.ld --section-start=text0=0x0ffffff4
+#source: relax_call26_boundary.s
+#objdump: -dr --prefix-addresses 
+# Test relaxation of call26 relocations via linker stubs.  We don't need to
+# check the exact layout of stubs for this test, only verify that it
+# links without "relocation truncated to fit" errors.
+
+#pass
diff --git a/ld/testsuite/ld-nios2/relax_call26_boundary_f8.d b/ld/testsuite/ld-nios2/relax_call26_boundary_f8.d
new file mode 100644
index 0000000..10eb654
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_boundary_f8.d
@@ -0,0 +1,9 @@
+#name: NIOS2 relax_call26_boundary_f8
+#ld: --relax -Trelax_call26_boundary.ld --section-start=text0=0x0ffffff8
+#source: relax_call26_boundary.s
+#objdump: -dr --prefix-addresses 
+# Test relaxation of call26 relocations via linker stubs.  We don't need to
+# check the exact layout of stubs for this test, only verify that it
+# links without "relocation truncated to fit" errors.
+
+#pass
diff --git a/ld/testsuite/ld-nios2/relax_call26_boundary_fc.d b/ld/testsuite/ld-nios2/relax_call26_boundary_fc.d
new file mode 100644
index 0000000..cf93b5a
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_boundary_fc.d
@@ -0,0 +1,9 @@
+#name: NIOS2 relax_call26_boundary_fc
+#ld: --relax -Trelax_call26_boundary.ld --section-start=text0=0x0ffffffc
+#source: relax_call26_boundary.s
+#objdump: -dr --prefix-addresses 
+# Test relaxation of call26 relocations via linker stubs.  We don't need to
+# check the exact layout of stubs for this test, only verify that it
+# links without "relocation truncated to fit" errors.
+
+#pass
diff --git a/ld/testsuite/ld-nios2/relax_call26_cache.d b/ld/testsuite/ld-nios2/relax_call26_cache.d
new file mode 100644
index 0000000..43121c0
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_cache.d
@@ -0,0 +1,9 @@
+#name: NIOS2 relax_call26_cache
+#ld: --relax -Trelax_call26_cache.ld
+#source: relax_call26_cache.s
+#objdump: -dr --prefix-addresses 
+# Test relaxation of call26 relocations via linker stubs.  We don't need to
+# check the exact layout of stubs for this test, only verify that it
+# links without "relocation truncated to fit" errors.
+
+#pass
diff --git a/ld/testsuite/ld-nios2/relax_call26_cache.ld b/ld/testsuite/ld-nios2/relax_call26_cache.ld
new file mode 100644
index 0000000..d3c4307
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_cache.ld
@@ -0,0 +1,13 @@
+/* Simple script for testing call26 relaxation via linker stubs.
+   In this case, input sections text0 and text1 are placed in the
+   same output section in the same 256MB segment, so they can share stubs.  */
+
+OUTPUT_FORMAT("elf32-littlenios2", "elf32-littlenios2", "elf32-littlenios2")
+OUTPUT_ARCH(nios2)
+ENTRY(_start)
+SECTIONS
+{
+	_start = .;
+	text0 0x0fffffe0 : { *(text0) *(text1) }
+	text2 0x40000000 : { *(text2) }
+}
diff --git a/ld/testsuite/ld-nios2/relax_call26_cache.s b/ld/testsuite/ld-nios2/relax_call26_cache.s
new file mode 100644
index 0000000..3712853
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_cache.s
@@ -0,0 +1,28 @@
+# test for call26 relaxation via linker stubs
+#
+# The purpose of this test is to ensure that, when section text0 straddles
+# a 256MB memory segment boundary with calls to the same function on either
+# side, the stub caching doesn't get confused and incorrectly use a stub
+# on the wrong side.
+
+.globl text0
+.section text0, "ax", @progbits
+	call func2a	# in distant section
+	call func2a	# in distant section
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	call func2a	# in distant section
+	call func2a	# in distant section
+
+.section text2, "ax", @progbits
+.globl func2a
+func2a:
+	ret
diff --git a/ld/testsuite/ld-nios2/relax_call26_multi.d b/ld/testsuite/ld-nios2/relax_call26_multi.d
new file mode 100644
index 0000000..28279ef
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_multi.d
@@ -0,0 +1,36 @@
+#name: NIOS2 relax_call26_multi
+#ld: --relax -Trelax_call26_multi.ld
+#source: relax_call26.s
+#objdump: -dr --prefix-addresses 
+# Test relaxation of call26 relocations via linker stubs
+
+.*: +file format elf32-littlenios2
+
+Disassembly of section text0:
+00000000 <_start> call	00000010 <func0>
+00000004 <[^>]*> call	0000002c <func1>
+00000008 <[^>]*> call	00000020 <[^>]*>
+0000000c <[^>]*> jmpi	00000014 <[^>]*>
+00000010 <func0> ret
+00000014 <[^>]*> movhi	at,16384
+00000018 <[^>]*> addi	at,at,16
+0000001c <[^>]*> jmp	at
+00000020 <[^>]*> movhi	at,16384
+00000024 <[^>]*> addi	at,at,0
+00000028 <[^>]*> jmp	at
+
+Disassembly of section text1:
+0000002c <func1> nop
+00000030 <[^>]*> nop
+00000034 <[^>]*> call	0000003c <[^>]*>
+00000038 <[^>]*> ret
+0000003c <[^>]*> movhi	at,16384
+00000040 <[^>]*> addi	at,at,0
+00000044 <[^>]*> jmp	at
+
+Disassembly of section text2:
+40000000 <func2a> nop
+40000004 <[^>]*> nop
+40000008 <[^>]*> nop
+4000000c <[^>]*> ret
+40000010 <func2b> nop
diff --git a/ld/testsuite/ld-nios2/relax_call26_multi.ld b/ld/testsuite/ld-nios2/relax_call26_multi.ld
new file mode 100644
index 0000000..750f747
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_multi.ld
@@ -0,0 +1,14 @@
+/* Simple script for testing call26 relaxation via linker stubs.
+   In this case, input sections text0 and text1 cannot share stubs
+   because they are in different output sections.  */
+
+OUTPUT_FORMAT("elf32-littlenios2", "elf32-littlenios2", "elf32-littlenios2")
+OUTPUT_ARCH(nios2)
+ENTRY(_start)
+SECTIONS
+{
+	_start = .;
+	text0 0 : { *(text0) }
+	text1 : { *(text1) }
+	text2 0x40000000 : { *(text2) }
+}
diff --git a/ld/testsuite/ld-nios2/relax_call26_norelax.d b/ld/testsuite/ld-nios2/relax_call26_norelax.d
new file mode 100644
index 0000000..7c7371c
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_norelax.d
@@ -0,0 +1,5 @@
+#name: NIOS2 relax_call26_norelax
+#ld: --no-relax -Trelax_call26_multi.ld
+#source: relax_call26.s
+#error: .*relocation truncated to fit: R_NIOS2_CALL26.*
+# Test relaxation of call26 relocations via linker stubs
diff --git a/ld/testsuite/ld-nios2/relax_call26_shared.d b/ld/testsuite/ld-nios2/relax_call26_shared.d
new file mode 100644
index 0000000..75ccbca
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_shared.d
@@ -0,0 +1,31 @@
+#name: NIOS2 relax_call26_shared
+#ld: --relax -Trelax_call26_shared.ld
+#source: relax_call26.s
+#objdump: -dr --prefix-addresses 
+# Test relaxation of call26 relocations via linker stubs
+
+.*: +file format elf32-littlenios2
+
+Disassembly of section text0:
+00000000 <_start> call	00000010 <func0>
+00000004 <[^>]*> call	00000014 <func1>
+00000008 <[^>]*> call	00000030 <[^>]*>
+0000000c <[^>]*> jmpi	00000024 <[^>]*>
+00000010 <func0> ret
+00000014 <func1> nop
+00000018 <[^>]*> nop
+0000001c <[^>]*> call	00000030 <[^>]*>
+00000020 <[^>]*> ret
+00000024 <[^>]*> movhi	at,16384
+00000028 <[^>]*> addi	at,at,16
+0000002c <[^>]*> jmp	at
+00000030 <[^>]*> movhi	at,16384
+00000034 <[^>]*> addi	at,at,0
+00000038 <[^>]*> jmp	at
+
+Disassembly of section text2:
+40000000 <func2a> nop
+40000004 <[^>]*> nop
+40000008 <[^>]*> nop
+4000000c <[^>]*> ret
+40000010 <func2b> nop
diff --git a/ld/testsuite/ld-nios2/relax_call26_shared.ld b/ld/testsuite/ld-nios2/relax_call26_shared.ld
new file mode 100644
index 0000000..6e6fd44
--- /dev/null
+++ b/ld/testsuite/ld-nios2/relax_call26_shared.ld
@@ -0,0 +1,13 @@
+/* Simple script for testing call26 relaxation via linker stubs.
+   In this case, input sections text0 and text1 are placed in the
+   same output section in the same 256MB segment, so they can share stubs.  */
+
+OUTPUT_FORMAT("elf32-littlenios2", "elf32-littlenios2", "elf32-littlenios2")
+OUTPUT_ARCH(nios2)
+ENTRY(_start)
+SECTIONS
+{
+	_start = .;
+	text0 0 : { *(text0) *(text1) }
+	text2 0x40000000 : { *(text2) }
+}