Commit of nios2 port to trunk:

contrib/
2013-12-31  Chung-Lin Tang  <cltang@codesourcery.com>

	* config-list.mk: Add nios2-elf, nios2-linux-gnu. Corrected
	ordering of some configs.

gcc/
2013-12-31  Chung-Lin Tang  <cltang@codesourcery.com>
	    Sandra Loosemore  <sandra@codesourcery.com>
	    Based on patches from Altera Corporation

	* config.gcc (nios2-*-*): Add nios2 config targets.
	* configure.ac (TLS_SECTION_ASM_FLAG): Add nios2 case.
	("$cpu_type"): Add nios2 as new cpu type.
	* configure: Regenerate.
	* config/nios2/nios2.c: New file.
	* config/nios2/nios2.h: New file.
	* config/nios2/nios2-opts.h: New file.
	* config/nios2/nios2-protos.h: New file.
	* config/nios2/elf.h: New file.
	* config/nios2/elf.opt: New file.
	* config/nios2/linux.h: New file.
	* config/nios2/nios2.opt: New file.
	* config/nios2/nios2.md: New file.
	* config/nios2/predicates.md: New file.
	* config/nios2/constraints.md: New file.
	* config/nios2/t-nios2: New file.
	* common/config/nios2/nios2-common.c: New file.
	* doc/invoke.texi (Nios II options): Document Nios II specific
	options.
	* doc/md.texi (Nios II family): Document Nios II specific
	constraints.
	* doc/extend.texi (Function Specific Option Pragmas): Document
	Nios II supported target pragma functionality.

gcc/testsuite/
2013-12-31  Sandra Loosemore  <sandra@codesourcery.com>
	    Chung-Lin Tang  <cltang@codesourcery.com>
	    Based on patches from Altera Corporation

	* gcc.dg/stack-usage-1.c (SIZE): Define case for __nios2__.
	* gcc.dg/20040813-1.c: Skip for nios2-*-*.
	* gcc.dg/20020312-2.c: Add __nios2__ case.
	* g++.dg/other/PR23205.C: Skip for nios2-*-*.
	* g++.dg/other/pr23205-2.C: Skip for nios2-*-*.
	* g++.dg/cpp0x/constexpr-rom.C: Skip for nios2-*-*.
	* g++.dg/cpp0x/alias-decl-debug-0.C: Skip for nios2-*-*.
	* g++.old-deja/g++.jason/thunk3.C: Skip for nios2-*-*.
	* lib/target-supports.exp (check_profiling_available): Check for
	nios2-*-elf.
	* gcc.c-torture/execute/pr47237.x:: Skip for nios2-*-*.
	* gcc.c-torture/execute/20101011-1.c: Skip for nios2-*-*.
	* gcc.c-torture/execute/builtins/lib/chk.c (memset): Place
	char-based memset loop before inline check, to prevent
	problems when called to initialize .bss. Update comments.
	* gcc.target/nios2/nios2.exp: New DejaGNU file.
	* gcc.target/nios2/nios2-custom-1.c: New test.
	* gcc.target/nios2/nios2-trap-insn.c: New test.
	* gcc.target/nios2/nios2-builtin-custom.c: New test.
	* gcc.target/nios2/nios2-builtin-io.c: New test.
	* gcc.target/nios2/nios2-stack-check-1.c: New test.
	* gcc.target/nios2/nios2-stack-check-2.c: New test.
	* gcc.target/nios2/nios2-rdctl.c: New test.
	* gcc.target/nios2/nios2-wrctl.c: New test.
	* gcc.target/nios2/nios2-wrctl-zero.c: New test.
	* gcc.target/nios2/nios2-wrctl-not-zero.c: New test.
	* gcc.target/nios2/nios2-rdwrctl-1.c: New test.
	* gcc.target/nios2/nios2-reg-constraints.c: New test.
	* gcc.target/nios2/nios2-ashlsi3-one_shift.c: New test.
	* gcc.target/nios2/nios2-mul-options-1.c: New test.
	* gcc.target/nios2/nios2-mul-options-2.c: New test.
	* gcc.target/nios2/nios2-mul-options-3.c: New test.
	* gcc.target/nios2/nios2-mul-options-4.c: New test.
	* gcc.target/nios2/nios2-nor.c: New test.
	* gcc.target/nios2/nios2-stxio.c: New test.
	* gcc.target/nios2/custom-fp-1.c: New test.
	* gcc.target/nios2/custom-fp-2.c: New test.
	* gcc.target/nios2/custom-fp-3.c: New test.
	* gcc.target/nios2/custom-fp-4.c: New test.
	* gcc.target/nios2/custom-fp-5.c: New test.
	* gcc.target/nios2/custom-fp-6.c: New test.
	* gcc.target/nios2/custom-fp-7.c: New test.
	* gcc.target/nios2/custom-fp-8.c: New test.
	* gcc.target/nios2/custom-fp-cmp-1.c: New test.
	* gcc.target/nios2/custom-fp-conversion.c: New test.
	* gcc.target/nios2/custom-fp-double.c: New test.
	* gcc.target/nios2/custom-fp-float.c: New test.
	* gcc.target/nios2/nios2-int-types.c: New test.
	* gcc.target/nios2/nios2-cache-1.c: New test.
	* gcc.target/nios2/nios2-cache-2.c: New test.

libgcc/
2013-12-31  Sandra Loosemore  <sandra@codesourcery.com>
	    Chung-Lin Tang  <cltang@codesourcery.com>
	    Based on patches from Altera Corporation

	* config.host (nios2-*-*,nios2-*-linux*): Add nios2 host cases.
	* config/nios2/lib2-nios2.h: New file.
	* config/nios2/lib2-divmod-hi.c: New file.
	* config/nios2/linux-unwind.h: New file.
	* config/nios2/lib2-divmod.c: New file.
	* config/nios2/linux-atomic.c: New file.
	* config/nios2/t-nios2: New file.
	* config/nios2/crti.asm: New file.
	* config/nios2/t-linux: New file.
	* config/nios2/lib2-divtable.c: New file.
	* config/nios2/lib2-mul.c: New file.
	* config/nios2/tramp.c: New file.
	* config/nios2/crtn.asm: New file.

From-SVN: r206256

13 files changed, 1075 insertions, 0 deletions

diff --git a/libgcc/config/nios2/crti.S b/libgcc/config/nios2/crti.S
new file mode 100644
index 0000000..23481b6
--- /dev/null
+++ b/libgcc/config/nios2/crti.S
@@ -0,0 +1,87 @@
+/* Copyright (C) 2012-2013 Free Software Foundation, Inc.
+   Contributed by Jonah Graham (jgraham@altera.com).
+   Contributed by Mentor Graphics, Inc.
+
+This file 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, or (at your option) any
+later version.
+
+This file 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+
+/* This file just make a stack frame for the contents of the .fini and
+   .init sections.  Users may put any desired instructions in those
+   sections.
+
+   While technically any code can be put in the init and fini sections
+   most stuff will not work other than stuff which obeys the call frame
+   and ABI.  All the call-preserved registers are saved, the call clobbered
+   registers should have been saved by the code calling init and fini.
+
+   See crtstuff.c for an example of code that inserts itself in the init
+   and fini sections. 
+
+   See crt0.s for the code that calls init and fini.  */
+
+	.file	"crti.asm"
+
+	.section	".init"
+	.align 2
+	.global	_init
+_init:
+	addi	sp, sp, -48
+	stw	ra, 44(sp)
+	stw	r23, 40(sp)
+	stw	r22, 36(sp)
+	stw	r21, 32(sp)
+	stw	r20, 28(sp)
+	stw	r19, 24(sp)
+	stw	r18, 20(sp)
+	stw	r17, 16(sp)
+	stw	r16, 12(sp)
+	stw	fp, 8(sp)
+	addi	fp, sp, 8
+#ifdef linux
+	nextpc	r22
+1:	movhi	r2, %hiadj(_GLOBAL_OFFSET_TABLE_ - 1b)
+	addi	r2, r2, %lo(_GLOBAL_OFFSET_TABLE_ - 1b)
+	add	r22, r22, r2
+#endif
+	
+	
+	.section	".fini"
+	.align	2
+	.global	_fini
+_fini:
+	addi	sp, sp, -48
+	stw	ra, 44(sp)
+	stw	r23, 40(sp)
+	stw	r22, 36(sp)
+	stw	r21, 32(sp)
+	stw	r20, 28(sp)
+	stw	r19, 24(sp)
+	stw	r18, 20(sp)
+	stw	r17, 16(sp)
+	stw	r16, 12(sp)
+	stw	fp, 8(sp)
+	addi	fp, sp, 8
+#ifdef linux
+	nextpc	r22
+1:	movhi	r2, %hiadj(_GLOBAL_OFFSET_TABLE_ - 1b)
+	addi	r2, r2, %lo(_GLOBAL_OFFSET_TABLE_ - 1b)
+	add	r22, r22, r2
+#endif
+
diff --git a/libgcc/config/nios2/crtn.S b/libgcc/config/nios2/crtn.S
new file mode 100644
index 0000000..722c1c7
--- /dev/null
+++ b/libgcc/config/nios2/crtn.S
@@ -0,0 +1,60 @@
+/* Copyright (C) 2012-2013 Free Software Foundation, Inc.
+   Contributed by Jonah Graham (jgraham@altera.com).
+   Contributed by Mentor Graphics, Inc.
+
+This file 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, or (at your option) any
+later version.
+
+This file 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+
+/* This file just makes sure that the .fini and .init sections do in
+fact return.  Users may put any desired instructions in those sections.
+This file is the last thing linked into any executable.
+*/	
+	.file	"crtn.asm"
+
+
+
+	.section	".init"
+	ldw	ra, 44(sp)
+	ldw	r23, 40(sp)
+	ldw	r22, 36(sp)
+	ldw	r21, 32(sp)
+	ldw	r20, 28(sp)
+	ldw	r19, 24(sp)
+	ldw	r18, 20(sp)
+	ldw	r17, 16(sp)
+	ldw	r16, 12(sp)
+	ldw	fp, 8(sp)
+	addi	sp, sp, 48
+	ret
+	
+	.section	".fini"
+	ldw	ra, 44(sp)
+	ldw	r23, 40(sp)
+	ldw	r22, 36(sp)
+	ldw	r21, 32(sp)
+	ldw	r20, 28(sp)
+	ldw	r19, 24(sp)
+	ldw	r18, 20(sp)
+	ldw	r17, 16(sp)
+	ldw	r16, 12(sp)
+	ldw	fp, 8(sp)
+	addi	sp, sp, 48
+	ret
+
diff --git a/libgcc/config/nios2/lib2-divmod-hi.c b/libgcc/config/nios2/lib2-divmod-hi.c
new file mode 100644
index 0000000..2745991
--- /dev/null
+++ b/libgcc/config/nios2/lib2-divmod-hi.c
@@ -0,0 +1,117 @@
+/* Copyright (C) 2012-2013 Free Software Foundation, Inc.
+   Contributed by Altera and Mentor Graphics, Inc.
+
+This file 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, or (at your option) any
+later version.
+
+This file 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#include "lib2-nios2.h"
+
+/* 16-bit HI divide and modulo as used in Nios II.  */
+
+static UHItype
+udivmodhi4 (UHItype num, UHItype den, word_type modwanted)
+{
+  UHItype bit = 1;
+  UHItype res = 0;
+
+  while (den < num && bit && !(den & (1L<<15)))
+    {
+      den <<=1;
+      bit <<=1;
+    }
+  while (bit)
+    {
+      if (num >= den)
+	{
+	  num -= den;
+	  res |= bit;
+	}
+      bit >>=1;
+      den >>=1;
+    }
+  if (modwanted)
+    return num;
+  return res;
+}
+
+
+HItype
+__divhi3 (HItype a, HItype b)
+{
+  word_type neg = 0;
+  HItype res;
+
+  if (a < 0)
+    {
+      a = -a;
+      neg = !neg;
+    }
+
+  if (b < 0)
+    {
+      b = -b;
+      neg = !neg;
+    }
+
+  res = udivmodhi4 (a, b, 0);
+
+  if (neg)
+    res = -res;
+
+  return res;
+}
+
+
+HItype
+__modhi3 (HItype a, HItype b)
+{
+  word_type neg = 0;
+  HItype res;
+
+  if (a < 0)
+    {
+      a = -a;
+      neg = 1;
+    }
+
+  if (b < 0)
+    b = -b;
+
+  res = udivmodhi4 (a, b, 1);
+
+  if (neg)
+    res = -res;
+
+  return res;
+}
+
+
+UHItype
+__udivhi3 (UHItype a, UHItype b)
+{
+  return udivmodhi4 (a, b, 0);
+}
+
+
+UHItype
+__umodhi3 (UHItype a, UHItype b)
+{
+  return udivmodhi4 (a, b, 1);
+}
+
diff --git a/libgcc/config/nios2/lib2-divmod.c b/libgcc/config/nios2/lib2-divmod.c
new file mode 100644
index 0000000..e5f9697
--- /dev/null
+++ b/libgcc/config/nios2/lib2-divmod.c
@@ -0,0 +1,117 @@
+/* Copyright (C) 2012-2013 Free Software Foundation, Inc.
+   Contributed by Altera and Mentor Graphics, Inc.
+
+This file 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, or (at your option) any
+later version.
+
+This file 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#include "lib2-nios2.h"
+
+/* 32-bit SI divide and modulo as used in Nios II.  */
+
+static USItype
+udivmodsi4 (USItype num, USItype den, word_type modwanted)
+{
+  USItype bit = 1;
+  USItype res = 0;
+
+  while (den < num && bit && !(den & (1L<<31)))
+    {
+      den <<=1;
+      bit <<=1;
+    }
+  while (bit)
+    {
+      if (num >= den)
+	{
+	  num -= den;
+	  res |= bit;
+	}
+      bit >>=1;
+      den >>=1;
+    }
+  if (modwanted)
+    return num;
+  return res;
+}
+
+
+SItype
+__divsi3 (SItype a, SItype b)
+{
+  word_type neg = 0;
+  SItype res;
+
+  if (a < 0)
+    {
+      a = -a;
+      neg = !neg;
+    }
+
+  if (b < 0)
+    {
+      b = -b;
+      neg = !neg;
+    }
+
+  res = udivmodsi4 (a, b, 0);
+
+  if (neg)
+    res = -res;
+
+  return res;
+}
+
+
+SItype
+__modsi3 (SItype a, SItype b)
+{
+  word_type neg = 0;
+  SItype res;
+
+  if (a < 0)
+    {
+      a = -a;
+      neg = 1;
+    }
+
+  if (b < 0)
+    b = -b;
+
+  res = udivmodsi4 (a, b, 1);
+
+  if (neg)
+    res = -res;
+
+  return res;
+}
+
+
+SItype
+__udivsi3 (SItype a, SItype b)
+{
+  return udivmodsi4 (a, b, 0);
+}
+
+
+SItype
+__umodsi3 (SItype a, SItype b)
+{
+  return udivmodsi4 (a, b, 1);
+}
+
diff --git a/libgcc/config/nios2/lib2-divtable.c b/libgcc/config/nios2/lib2-divtable.c
new file mode 100644
index 0000000..4f6a230
--- /dev/null
+++ b/libgcc/config/nios2/lib2-divtable.c
@@ -0,0 +1,60 @@
+/* Copyright (C) 2012-2013 Free Software Foundation, Inc.
+   Contributed by Altera and Mentor Graphics, Inc.
+
+This file 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, or (at your option) any
+later version.
+
+This file 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#include "lib2-nios2.h"
+
+UQItype __divsi3_table[] =
+{
+  0, 0/1, 0/2, 0/3, 0/4, 0/5, 0/6, 0/7,
+    0/8, 0/9, 0/10, 0/11, 0/12, 0/13, 0/14, 0/15,
+  0, 1/1, 1/2, 1/3, 1/4, 1/5, 1/6, 1/7,
+    1/8, 1/9, 1/10, 1/11, 1/12, 1/13, 1/14, 1/15,
+  0, 2/1, 2/2, 2/3, 2/4, 2/5, 2/6, 2/7,
+    2/8, 2/9, 2/10, 2/11, 2/12, 2/13, 2/14, 2/15,
+  0, 3/1, 3/2, 3/3, 3/4, 3/5, 3/6, 3/7,
+    3/8, 3/9, 3/10, 3/11, 3/12, 3/13, 3/14, 3/15,
+  0, 4/1, 4/2, 4/3, 4/4, 4/5, 4/6, 4/7,
+    4/8, 4/9, 4/10, 4/11, 4/12, 4/13, 4/14, 4/15,
+  0, 5/1, 5/2, 5/3, 5/4, 5/5, 5/6, 5/7,
+    5/8, 5/9, 5/10, 5/11, 5/12, 5/13, 5/14, 5/15,
+  0, 6/1, 6/2, 6/3, 6/4, 6/5, 6/6, 6/7,
+    6/8, 6/9, 6/10, 6/11, 6/12, 6/13, 6/14, 6/15,
+  0, 7/1, 7/2, 7/3, 7/4, 7/5, 7/6, 7/7,
+    7/8, 7/9, 7/10, 7/11, 7/12, 7/13, 7/14, 7/15,
+  0, 8/1, 8/2, 8/3, 8/4, 8/5, 8/6, 8/7,
+    8/8, 8/9, 8/10, 8/11, 8/12, 8/13, 8/14, 8/15,
+  0, 9/1, 9/2, 9/3, 9/4, 9/5, 9/6, 9/7,
+    9/8, 9/9, 9/10, 9/11, 9/12, 9/13, 9/14, 9/15,
+  0, 10/1, 10/2, 10/3, 10/4, 10/5, 10/6, 10/7,
+    10/8, 10/9, 10/10, 10/11, 10/12, 10/13, 10/14, 10/15,
+  0, 11/1, 11/2, 11/3, 11/4, 11/5, 11/6, 11/7,
+    11/8, 11/9, 11/10, 11/11, 11/12, 11/13, 11/14, 11/15,
+  0, 12/1, 12/2, 12/3, 12/4, 12/5, 12/6, 12/7,
+    12/8, 12/9, 12/10, 12/11, 12/12, 12/13, 12/14, 12/15,
+  0, 13/1, 13/2, 13/3, 13/4, 13/5, 13/6, 13/7,
+    13/8, 13/9, 13/10, 13/11, 13/12, 13/13, 13/14, 13/15,
+  0, 14/1, 14/2, 14/3, 14/4, 14/5, 14/6, 14/7,
+    14/8, 14/9, 14/10, 14/11, 14/12, 14/13, 14/14, 14/15,
+  0, 15/1, 15/2, 15/3, 15/4, 15/5, 15/6, 15/7,
+    15/8, 15/9, 15/10, 15/11, 15/12, 15/13, 15/14, 15/15,
+};
+
diff --git a/libgcc/config/nios2/lib2-mul.c b/libgcc/config/nios2/lib2-mul.c
new file mode 100644
index 0000000..4c247fe
--- /dev/null
+++ b/libgcc/config/nios2/lib2-mul.c
@@ -0,0 +1,42 @@
+/* Copyright (C) 2012-2013 Free Software Foundation, Inc.
+   Contributed by Altera and Mentor Graphics, Inc.
+
+This file 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, or (at your option) any
+later version.
+
+This file 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#include "lib2-nios2.h"
+
+/* 32-bit SI multiply for Nios II.  */
+
+SItype
+__mulsi3 (SItype a, SItype b)
+{
+  SItype res = 0;
+  USItype cnt = a;
+  
+  while (cnt)
+    {
+      if (cnt & 1)
+	res += b;	  
+      b <<= 1;
+      cnt >>= 1;
+    }
+    
+  return res;
+}
diff --git a/libgcc/config/nios2/lib2-nios2.h b/libgcc/config/nios2/lib2-nios2.h
new file mode 100644
index 0000000..a581aa5
--- /dev/null
+++ b/libgcc/config/nios2/lib2-nios2.h
@@ -0,0 +1,49 @@
+/* Integer arithmetic support for Altera Nios II.
+   
+   Copyright (C) 2012-2013 Free Software Foundation, Inc.
+   Contributed by Altera and Mentor Graphics, Inc.
+
+   This file 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, or (at your option) any
+   later version.
+   
+   This file 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.
+   
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+   
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef LIB2_NIOS2_H
+#define LIB2_NIOS2_H
+
+/* Types.  */
+
+typedef char QItype __attribute__ ((mode (QI)));
+typedef unsigned char UQItype __attribute__ ((mode (QI)));
+typedef short HItype __attribute__ ((mode (HI)));
+typedef unsigned short UHItype __attribute__ ((mode (HI)));
+typedef int SItype __attribute__ ((mode (SI)));
+typedef unsigned int USItype __attribute__ ((mode (SI)));
+typedef int word_type __attribute__ ((mode (__word__)));
+
+/* Exported functions.  */
+extern SItype __divsi3 (SItype, SItype);
+extern SItype __modsi3 (SItype, SItype);
+extern SItype __udivsi3 (SItype, SItype);
+extern SItype __umodsi3 (SItype, SItype);
+extern HItype __divhi3 (HItype, HItype);
+extern HItype __modhi3 (HItype, HItype);
+extern UHItype __udivhi3 (UHItype, UHItype);
+extern UHItype __umodhi3 (UHItype, UHItype);
+extern SItype __mulsi3 (SItype, SItype);
+
+#endif /* LIB2_NIOS2_H */
diff --git a/libgcc/config/nios2/linux-atomic.c b/libgcc/config/nios2/linux-atomic.c
new file mode 100644
index 0000000..1fc91dd
--- /dev/null
+++ b/libgcc/config/nios2/linux-atomic.c
@@ -0,0 +1,286 @@
+/* Linux-specific atomic operations for Nios II Linux.
+   Copyright (C) 2008-2013 Free Software Foundation, Inc.
+
+This file 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, or (at your option) any
+later version.
+
+This file 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#include <asm/unistd.h>
+#define EFAULT  14
+#define EBUSY   16
+#define ENOSYS  38
+
+/* We implement byte, short and int versions of each atomic operation
+   using the kernel helper defined below.  There is no support for
+   64-bit operations yet.  */
+
+/* Crash a userspace program with SIGSEV.  */
+#define ABORT_INSTRUCTION asm ("stw zero, 0(zero)")
+
+/* Kernel helper for compare-and-exchange a 32-bit value.  */
+static inline long
+__kernel_cmpxchg (int oldval, int newval, int *mem)
+{
+  register int r2 asm ("r2");
+  register int *r4 asm ("r4") = mem;
+  register int r5 asm ("r5") = oldval;
+  register int r6 asm ("r6") = newval;
+
+  /* Call the kernel provided fixed address cmpxchg helper routine.  */
+  asm volatile ("movi %0, %4\n\t"
+		"callr %0\n"
+		: "=r" (r2)
+		: "r" (r4), "r" (r5), "r" (r6), "I" (0x00001004)
+		: "ra", "memory");
+  return r2;
+}
+
+#define HIDDEN __attribute__ ((visibility ("hidden")))
+
+#ifdef __nios2_little_endian__
+#define INVERT_MASK_1 0
+#define INVERT_MASK_2 0
+#else
+#define INVERT_MASK_1 24
+#define INVERT_MASK_2 16
+#endif
+
+#define MASK_1 0xffu
+#define MASK_2 0xffffu
+
+#define FETCH_AND_OP_WORD(OP, PFX_OP, INF_OP)				\
+  int HIDDEN								\
+  __sync_fetch_and_##OP##_4 (int *ptr, int val)				\
+  {									\
+    int failure, tmp;							\
+									\
+    do {								\
+      tmp = *ptr;							\
+      failure = __kernel_cmpxchg (tmp, PFX_OP (tmp INF_OP val), ptr);	\
+    } while (failure != 0);						\
+									\
+    return tmp;								\
+  }
+
+FETCH_AND_OP_WORD (add,   , +)
+FETCH_AND_OP_WORD (sub,   , -)
+FETCH_AND_OP_WORD (or,    , |)
+FETCH_AND_OP_WORD (and,   , &)
+FETCH_AND_OP_WORD (xor,   , ^)
+FETCH_AND_OP_WORD (nand, ~, &)
+
+#define NAME_oldval(OP, WIDTH) __sync_fetch_and_##OP##_##WIDTH
+#define NAME_newval(OP, WIDTH) __sync_##OP##_and_fetch_##WIDTH
+
+/* Implement both __sync_<op>_and_fetch and __sync_fetch_and_<op> for
+   subword-sized quantities.  */
+
+#define SUBWORD_SYNC_OP(OP, PFX_OP, INF_OP, TYPE, WIDTH, RETURN)	\
+  TYPE HIDDEN								\
+  NAME##_##RETURN (OP, WIDTH) (TYPE *ptr, TYPE val)			\
+  {									\
+    int *wordptr = (int *) ((unsigned long) ptr & ~3);			\
+    unsigned int mask, shift, oldval, newval;				\
+    int failure;							\
+									\
+    shift = (((unsigned long) ptr & 3) << 3) ^ INVERT_MASK_##WIDTH;	\
+    mask = MASK_##WIDTH << shift;					\
+									\
+    do {								\
+      oldval = *wordptr;						\
+      newval = ((PFX_OP (((oldval & mask) >> shift)			\
+			 INF_OP (unsigned int) val)) << shift) & mask;	\
+      newval |= oldval & ~mask;						\
+      failure = __kernel_cmpxchg (oldval, newval, wordptr);		\
+    } while (failure != 0);						\
+									\
+    return (RETURN & mask) >> shift;					\
+  }
+
+SUBWORD_SYNC_OP (add,   , +, unsigned short, 2, oldval)
+SUBWORD_SYNC_OP (sub,   , -, unsigned short, 2, oldval)
+SUBWORD_SYNC_OP (or,    , |, unsigned short, 2, oldval)
+SUBWORD_SYNC_OP (and,   , &, unsigned short, 2, oldval)
+SUBWORD_SYNC_OP (xor,   , ^, unsigned short, 2, oldval)
+SUBWORD_SYNC_OP (nand, ~, &, unsigned short, 2, oldval)
+
+SUBWORD_SYNC_OP (add,   , +, unsigned char, 1, oldval)
+SUBWORD_SYNC_OP (sub,   , -, unsigned char, 1, oldval)
+SUBWORD_SYNC_OP (or,    , |, unsigned char, 1, oldval)
+SUBWORD_SYNC_OP (and,   , &, unsigned char, 1, oldval)
+SUBWORD_SYNC_OP (xor,   , ^, unsigned char, 1, oldval)
+SUBWORD_SYNC_OP (nand, ~, &, unsigned char, 1, oldval)
+
+#define OP_AND_FETCH_WORD(OP, PFX_OP, INF_OP)				\
+  int HIDDEN								\
+  __sync_##OP##_and_fetch_4 (int *ptr, int val)				\
+  {									\
+    int tmp, failure;							\
+									\
+    do {								\
+      tmp = *ptr;							\
+      failure = __kernel_cmpxchg (tmp, PFX_OP (tmp INF_OP val), ptr);	\
+    } while (failure != 0);						\
+									\
+    return PFX_OP (tmp INF_OP val);					\
+  }
+
+OP_AND_FETCH_WORD (add,   , +)
+OP_AND_FETCH_WORD (sub,   , -)
+OP_AND_FETCH_WORD (or,    , |)
+OP_AND_FETCH_WORD (and,   , &)
+OP_AND_FETCH_WORD (xor,   , ^)
+OP_AND_FETCH_WORD (nand, ~, &)
+
+SUBWORD_SYNC_OP (add,   , +, unsigned short, 2, newval)
+SUBWORD_SYNC_OP (sub,   , -, unsigned short, 2, newval)
+SUBWORD_SYNC_OP (or,    , |, unsigned short, 2, newval)
+SUBWORD_SYNC_OP (and,   , &, unsigned short, 2, newval)
+SUBWORD_SYNC_OP (xor,   , ^, unsigned short, 2, newval)
+SUBWORD_SYNC_OP (nand, ~, &, unsigned short, 2, newval)
+
+SUBWORD_SYNC_OP (add,   , +, unsigned char, 1, newval)
+SUBWORD_SYNC_OP (sub,   , -, unsigned char, 1, newval)
+SUBWORD_SYNC_OP (or,    , |, unsigned char, 1, newval)
+SUBWORD_SYNC_OP (and,   , &, unsigned char, 1, newval)
+SUBWORD_SYNC_OP (xor,   , ^, unsigned char, 1, newval)
+SUBWORD_SYNC_OP (nand, ~, &, unsigned char, 1, newval)
+
+int HIDDEN
+__sync_val_compare_and_swap_4 (int *ptr, int oldval, int newval)
+{
+  int actual_oldval, fail;
+    
+  while (1)
+    {
+      actual_oldval = *ptr;
+
+      if (oldval != actual_oldval)
+	return actual_oldval;
+
+      fail = __kernel_cmpxchg (actual_oldval, newval, ptr);
+  
+      if (!fail)
+	return oldval;
+    }
+}
+
+#define SUBWORD_VAL_CAS(TYPE, WIDTH)					\
+  TYPE HIDDEN								\
+  __sync_val_compare_and_swap_##WIDTH (TYPE *ptr, TYPE oldval,		\
+				       TYPE newval)			\
+  {									\
+    int *wordptr = (int *)((unsigned long) ptr & ~3), fail;		\
+    unsigned int mask, shift, actual_oldval, actual_newval;		\
+									\
+    shift = (((unsigned long) ptr & 3) << 3) ^ INVERT_MASK_##WIDTH;	\
+    mask = MASK_##WIDTH << shift;					\
+									\
+    while (1)								\
+      {									\
+	actual_oldval = *wordptr;					\
+									\
+	if (((actual_oldval & mask) >> shift) != (unsigned int) oldval)	\
+          return (actual_oldval & mask) >> shift;			\
+									\
+	actual_newval = (actual_oldval & ~mask)				\
+			| (((unsigned int) newval << shift) & mask);	\
+									\
+	fail = __kernel_cmpxchg (actual_oldval, actual_newval,		\
+				 wordptr);				\
+									\
+	if (!fail)							\
+	  return oldval;						\
+      }									\
+  }
+
+SUBWORD_VAL_CAS (unsigned short, 2)
+SUBWORD_VAL_CAS (unsigned char,  1)
+
+typedef unsigned char bool;
+
+bool HIDDEN
+__sync_bool_compare_and_swap_4 (int *ptr, int oldval, int newval)
+{
+  int failure = __kernel_cmpxchg (oldval, newval, ptr);
+  return (failure == 0);
+}
+
+#define SUBWORD_BOOL_CAS(TYPE, WIDTH)					\
+  bool HIDDEN								\
+  __sync_bool_compare_and_swap_##WIDTH (TYPE *ptr, TYPE oldval,		\
+					TYPE newval)			\
+  {									\
+    TYPE actual_oldval							\
+      = __sync_val_compare_and_swap_##WIDTH (ptr, oldval, newval);	\
+    return (oldval == actual_oldval);					\
+  }
+
+SUBWORD_BOOL_CAS (unsigned short, 2)
+SUBWORD_BOOL_CAS (unsigned char,  1)
+
+int HIDDEN
+__sync_lock_test_and_set_4 (int *ptr, int val)
+{
+  int failure, oldval;
+
+  do {
+    oldval = *ptr;
+    failure = __kernel_cmpxchg (oldval, val, ptr);
+  } while (failure != 0);
+
+  return oldval;
+}
+
+#define SUBWORD_TEST_AND_SET(TYPE, WIDTH)				\
+  TYPE HIDDEN								\
+  __sync_lock_test_and_set_##WIDTH (TYPE *ptr, TYPE val)		\
+  {									\
+    int failure;							\
+    unsigned int oldval, newval, shift, mask;				\
+    int *wordptr = (int *) ((unsigned long) ptr & ~3);			\
+									\
+    shift = (((unsigned long) ptr & 3) << 3) ^ INVERT_MASK_##WIDTH;	\
+    mask = MASK_##WIDTH << shift;					\
+									\
+    do {								\
+      oldval = *wordptr;						\
+      newval = (oldval & ~mask)						\
+	       | (((unsigned int) val << shift) & mask);		\
+      failure = __kernel_cmpxchg (oldval, newval, wordptr);		\
+    } while (failure != 0);						\
+									\
+    return (oldval & mask) >> shift;					\
+  }
+
+SUBWORD_TEST_AND_SET (unsigned short, 2)
+SUBWORD_TEST_AND_SET (unsigned char,  1)
+
+#define SYNC_LOCK_RELEASE(TYPE, WIDTH)					\
+  void HIDDEN								\
+  __sync_lock_release_##WIDTH (TYPE *ptr)				\
+  {									\
+    /* All writes before this point must be seen before we release	\
+       the lock itself.  */						\
+    __builtin_sync ();							\
+    *ptr = 0;								\
+  }
+
+SYNC_LOCK_RELEASE (int,   4)
+SYNC_LOCK_RELEASE (short, 2)
+SYNC_LOCK_RELEASE (char,  1)
diff --git a/libgcc/config/nios2/linux-unwind.h b/libgcc/config/nios2/linux-unwind.h
new file mode 100644
index 0000000..e71f527
--- /dev/null
+++ b/libgcc/config/nios2/linux-unwind.h
@@ -0,0 +1,106 @@
+/* DWARF2 EH unwinding support for Nios II Linux.
+   Copyright (C) 2008-2013 Free Software Foundation, Inc.
+
+This file 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, or (at your option) any
+later version.
+
+This file 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef inhibit_libc
+
+/* Do code reading to identify a signal frame, and set the frame
+   state data appropriately.  See unwind-dw2.c for the structs.
+   The corresponding bits in the Linux kernel are in
+   arch/nios2/kernel/signal.c.  */
+
+#include <signal.h>
+#include <asm/unistd.h>
+
+/* Exactly the same layout as the kernel structures, unique names.  */
+struct nios2_mcontext {
+  int version;
+  int gregs[32];
+};
+
+struct nios2_ucontext {
+  unsigned long uc_flags;
+  struct ucontext *uc_link;
+  stack_t uc_stack;
+  struct nios2_mcontext uc_mcontext;
+  sigset_t uc_sigmask;	/* mask last for extensibility */
+};
+
+#define MD_FALLBACK_FRAME_STATE_FOR nios2_fallback_frame_state
+
+static _Unwind_Reason_Code
+nios2_fallback_frame_state (struct _Unwind_Context *context,
+			    _Unwind_FrameState *fs)
+{
+  u_int32_t *pc = (u_int32_t *) context->ra;
+  _Unwind_Ptr new_cfa;
+
+  /* The expected sequence of instructions is:
+       movi r2,(rt_sigreturn)
+       trap
+     Check for the trap first.  */
+  if (pc[1] != 0x003b683a)
+    return _URC_END_OF_STACK;
+
+#define NIOS2_REG(NUM,NAME)						\
+  (fs->regs.reg[NUM].how = REG_SAVED_OFFSET,				\
+   fs->regs.reg[NUM].loc.offset = (_Unwind_Ptr)&(regs->NAME) - new_cfa)
+
+  if (pc[0] == (0x00800004 | (__NR_rt_sigreturn << 6)))
+    {
+      struct rt_sigframe {
+	char retcode[12];
+	siginfo_t info;
+	struct nios2_ucontext uc;
+      } *rt_ = context->ra;
+      struct nios2_mcontext *regs = &rt_->uc.uc_mcontext;
+      int i;
+
+      /* MCONTEXT_VERSION is defined to 2 in the kernel.  */
+      if (regs->version != 2)
+	return _URC_END_OF_STACK;
+
+      /* The CFA is the user's incoming stack pointer value.  */
+      new_cfa = (_Unwind_Ptr)regs->gregs[28];
+      fs->regs.cfa_how = CFA_REG_OFFSET;
+      fs->regs.cfa_reg = STACK_POINTER_REGNUM;
+      fs->regs.cfa_offset = new_cfa - (_Unwind_Ptr) context->cfa;
+
+      /* The sequential registers.  */
+      for (i = 1; i < 24; i++)
+	NIOS2_REG (i, gregs[i-1]);
+      
+      /* The random registers.  The kernel stores these in a funny order
+	 in the gregs array.  */
+      NIOS2_REG (RA_REGNO, gregs[23]);
+      NIOS2_REG (FP_REGNO, gregs[24]);
+      NIOS2_REG (GP_REGNO, gregs[25]);
+      NIOS2_REG (EA_REGNO, gregs[27]);
+      
+      fs->retaddr_column = EA_REGNO;
+      fs->signal_frame = 1;
+      
+      return _URC_NO_REASON;
+    }
+#undef NIOS2_REG
+  return _URC_END_OF_STACK;
+}
+#endif
diff --git a/libgcc/config/nios2/sfp-machine.h b/libgcc/config/nios2/sfp-machine.h
new file mode 100644
index 0000000..f318567
--- /dev/null
+++ b/libgcc/config/nios2/sfp-machine.h
@@ -0,0 +1,78 @@
+/* Soft-FP definitions for Altera Nios II.
+   Copyright (C) 2013 Free Software Foundation, Inc.
+
+This file 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, or (at your option) any
+later version.
+
+This file 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#define _FP_W_TYPE_SIZE		32
+#define _FP_W_TYPE		unsigned long
+#define _FP_WS_TYPE		signed long
+#define _FP_I_TYPE		long
+
+#define _FP_MUL_MEAT_S(R,X,Y)				\
+  _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_S,R,X,Y,umul_ppmm)
+#define _FP_MUL_MEAT_D(R,X,Y)				\
+  _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
+#define _FP_MUL_MEAT_Q(R,X,Y)				\
+  _FP_MUL_MEAT_4_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
+
+#define _FP_DIV_MEAT_S(R,X,Y)	_FP_DIV_MEAT_1_loop(S,R,X,Y)
+#define _FP_DIV_MEAT_D(R,X,Y)	_FP_DIV_MEAT_2_udiv(D,R,X,Y)
+#define _FP_DIV_MEAT_Q(R,X,Y)	_FP_DIV_MEAT_4_udiv(Q,R,X,Y)
+
+#define _FP_NANFRAC_S		((_FP_QNANBIT_S << 1) - 1)
+#define _FP_NANFRAC_D		((_FP_QNANBIT_D << 1) - 1), -1
+#define _FP_NANFRAC_Q		((_FP_QNANBIT_Q << 1) - 1), -1, -1, -1
+#define _FP_NANSIGN_S		0
+#define _FP_NANSIGN_D		0
+#define _FP_NANSIGN_Q		0
+
+#define _FP_KEEPNANFRACP 1
+#define _FP_QNANNEGATEDP 0
+
+/* Someone please check this.  */
+#define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)			\
+  do {								\
+    if ((_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs)		\
+	&& !(_FP_FRAC_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs))	\
+      {								\
+	R##_s = Y##_s;						\
+	_FP_FRAC_COPY_##wc(R,Y);				\
+      }								\
+    else							\
+      {								\
+	R##_s = X##_s;						\
+	_FP_FRAC_COPY_##wc(R,X);				\
+      }								\
+    R##_c = FP_CLS_NAN;						\
+  } while (0)
+
+#define	__LITTLE_ENDIAN	1234
+#define	__BIG_ENDIAN	4321
+
+#ifdef __nios2_little_endian__
+#define __BYTE_ORDER __LITTLE_ENDIAN
+#else
+#define __BYTE_ORDER __BIG_ENDIAN
+#endif
+
+/* Define ALIASNAME as a strong alias for NAME.  */
+# define strong_alias(name, aliasname) _strong_alias(name, aliasname)
+# define _strong_alias(name, aliasname) \
+  extern __typeof (name) aliasname __attribute__ ((alias (#name)));
diff --git a/libgcc/config/nios2/t-linux b/libgcc/config/nios2/t-linux
new file mode 100644
index 0000000..1fa581e
--- /dev/null
+++ b/libgcc/config/nios2/t-linux
@@ -0,0 +1,7 @@
+# Soft-float functions go in glibc only, to facilitate the possible
+# future addition of exception and rounding mode support integrated
+# with <fenv.h>.
+
+LIB2FUNCS_EXCLUDE = _floatdidf _floatdisf _fixunsdfsi _fixunssfsi \
+  _fixunsdfdi _fixdfdi _fixunssfdi _fixsfdi _floatundidf _floatundisf
+LIB2ADD += $(srcdir)/config/nios2/linux-atomic.c
diff --git a/libgcc/config/nios2/t-nios2 b/libgcc/config/nios2/t-nios2
new file mode 100644
index 0000000..320dedf
--- /dev/null
+++ b/libgcc/config/nios2/t-nios2
@@ -0,0 +1,5 @@
+LIB2ADD += $(srcdir)/config/nios2/lib2-divmod.c \
+	   $(srcdir)/config/nios2/lib2-divmod-hi.c \
+	   $(srcdir)/config/nios2/lib2-divtable.c \
+	   $(srcdir)/config/nios2/lib2-mul.c \
+	   $(srcdir)/config/nios2/tramp.c
diff --git a/libgcc/config/nios2/tramp.c b/libgcc/config/nios2/tramp.c
new file mode 100644
index 0000000..3d9d249
--- /dev/null
+++ b/libgcc/config/nios2/tramp.c
@@ -0,0 +1,61 @@
+/* Copyright (C) 2013 Free Software Foundation, Inc.
+   Contributed by Altera and Mentor Graphics, Inc.
+
+This file 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, or (at your option) any
+later version.
+
+This file 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+/* Set up trampolines.
+   R12 is the static chain register.
+   R2 is AT, the assembler temporary.
+   The trampoline code looks like:
+	movhi	r12,%hi(chain)
+	ori	r12,%lo(chain)
+	movhi	r2,%hi(fn)
+	ori	r2,%lo(fn)
+	jmp	r2
+*/
+
+#define SC_REGNO 12
+
+#define MOVHI(reg,imm16) \
+  (((reg) << 22) | ((imm16) << 6) | 0x34)
+#define ORI(reg,imm16) \
+  (((reg) << 27) | ((reg) << 22) | ((imm16) << 6) | 0x14)
+#define JMP(reg) \
+  (((reg) << 27) | (0x0d << 11) | 0x3a)
+
+void
+__trampoline_setup (unsigned int *addr, void *fnptr, void *chainptr)
+{
+  unsigned int fn = (unsigned int) fnptr;
+  unsigned int chain = (unsigned int) chainptr;
+  int i;
+
+  addr[0] = MOVHI (SC_REGNO, ((chain >> 16) & 0xffff));
+  addr[1] = ORI (SC_REGNO, (chain & 0xffff));
+  addr[2] = MOVHI (2, ((fn >> 16) & 0xffff));
+  addr[3] = ORI (2, (fn & 0xffff));
+  addr[4] = JMP (2);
+
+  /* Flush the caches.
+     See Example 9-4 in the Nios II Software Developer's Handbook.  */
+  for (i = 0; i < 5; i++)
+    asm volatile ("flushd 0(%0); flushi %0" :: "r"(addr + i) : "memory");
+  asm volatile ("flushp" ::: "memory");
+}