Add support for MIPS O32 FPXX and .MIPS.abiflags

	* elf/elf.h (PT_MIPS_ABIFLAGS): Define.
	(Elf_MIPS_ABIFlags_v0): New structure.
	(EF_MIPS_FP64): Define.
	(MIPS_AFL_REG_NONE, MIPS_AFL_REG_32, MIPS_AFL_REG_64): Likewise.
	(MIPS_AFL_REG_128, MIPS_AFL_ASE_DSP, MIPS_AFL_ASE_DSP64): Likewise.
	(MIPS_AFL_ASE_DSPR2, MIPS_AFL_ASE_EVA, MIPS_AFL_ASE_MCU): Likewise.
	(MIPS_AFL_ASE_MDMX, MIPS_AFL_ASE_MIPS3D, MIPS_AFL_ASE_MT): Likewise.
	(MIPS_AFL_ASE_SMARTMIPS, MIPS_AFL_ASE_VIRT): Likewise.
	(MIPS_AFL_ASE_VIRT64, MIPS_AFL_ASE_MSA, MIPS_AFL_ASE_MSA64): Likewise.
	(MIPS_AFL_ASE_MIPS16, MIPS_AFL_ASE_MICROMIPS): Likewise.
	(MIPS_AFL_ASE_XPA, MIPS_AFL_EXT_XLR, MIPS_AFL_EXT_OCTEON2): Likewise.
	(MIPS_AFL_EXT_OCTEONP, MIPS_AFL_EXT_LOONGSON_3A): Likewise.
	(MIPS_AFL_EXT_OCTEON, MIPS_AFL_EXT_5900, MIPS_AFL_EXT_4010): Likewise.
	(MIPS_AFL_EXT_4100, MIPS_AFL_EXT_3900, MIPS_AFL_EXT_10000): Likewise.
	(MIPS_AFL_EXT_SB1, MIPS_AFL_EXT_4111, MIPS_AFL_EXT_4120): Likewise.
	(MIPS_AFL_EXT_5400, MIPS_AFL_EXT_5500): Likewise.
	(MIPS_AFL_EXT_LOONGSON_2E, MIPS_AFL_EXT_LOONGSON_2F): Likewise.
	(Val_GNU_MIPS_ABI_FP_ANY, Val_GNU_MIPS_ABI_FP_DOUBLE): New enum values.
	(Val_GNU_MIPS_ABI_FP_SINGLE, Val_GNU_MIPS_ABI_FP_SOFT): Likewise.
	(Val_GNU_MIPS_ABI_FP_OLD_64, Val_GNU_MIPS_ABI_FP_XX): Likewise.
	(Val_GNU_MIPS_ABI_FP_64, Val_GNU_MIPS_ABI_FP_64A): Likewise.
	(Val_GNU_MIPS_ABI_FP_MAX): Likewise.
	* sysdeps/mips/Makefile [subdir=elf]: Add tst-abi-interlink,
	tst-mode-switch-1, tst-mode-switch-2, tst-mode-switch-3 tests.
	* sysdeps/mips/bits/linkmap.h (struct link_map_machine): Add fpmode
	field.
	* sysdeps/mips/dl-machine.h (elf_machine_matches_host): Reject
	EF_MIPS_FP64.
	* sysdeps/mips/dl-machine-reject-phdr.h: New file.
	* sysdeps/mips/tst-abi-fp32mod.c: Likewise.
	* sysdeps/mips/tst-abi-fpxxmod.c: Likewise.
	* sysdeps/mips/tst-abi-fpxxomod.c: Likewise.
	* sysdeps/mips/tst-abi-fp64mod.c: Likewise.
	* sysdeps/mips/tst-abi-fp64amod.c: Likewise.
	* sysdeps/mips/tst-abi-interlink.c: Likewise.
	* sysdeps/mips/tst-mode-switch-1.c: Likewise.
	* sysdeps/mips/tst-mode-switch-2.c: Likewise.
	* sysdeps/mips/tst-mode-switch-3.c: Likewise.
	* sysdeps/unix/sysv/linux/mips/configure.ac (o32-fpabi): Define to
	record the current FP ABI extension.
	(mips-mode-switch): Define to show if kernel headers support mode
	switching.
	* sysdeps/unix/sysv/linux/mips/configure: Regenerate.
	* sysdeps/unix/sysv/linux/mips/ldsodefs.h: Increase maximum
	supported SYSV ABI version to 3.
	* sysdeps/unix/sysv/linux/mips/libc-abis: Add new MIPS_O32_FP64
	feature.

17 files changed, 1912 insertions, 1 deletions

diff --git a/sysdeps/mips/Makefile b/sysdeps/mips/Makefile
index a1526998e0..463b121758 100644
--- a/sysdeps/mips/Makefile
+++ b/sysdeps/mips/Makefile
@@ -26,3 +26,53 @@ CPPFLAGS-crtn.S += $(pic-ccflag)
 endif
 
 ASFLAGS-.os += $(pic-ccflag)
+
+ifeq ($(subdir),elf)
+ifneq ($(o32-fpabi),)
+tests += tst-abi-interlink
+
+fpabi-modules-names =
+fpabi_list =
+ifneq (,$(filter $(o32-fpabi),32 xx xxo))
+fpabi-modules-names += tst-abi-fp32mod
+CFLAGS-tst-abi-fp32mod.c += -mfp32
+endif
+ifneq (,$(filter $(o32-fpabi),xx))
+fpabi-modules-names += tst-abi-fpxxmod
+CFLAGS-tst-abi-fpxxmod.c += -mfpxx -mno-odd-spreg
+endif
+ifneq (,$(filter $(o32-fpabi),xx xxo))
+fpabi-modules-names += tst-abi-fpxxomod
+CFLAGS-tst-abi-fpxxomod.c += -mfpxx -modd-spreg
+endif
+ifneq (,$(filter $(o32-fpabi),xx 64a))
+fpabi-modules-names += tst-abi-fp64amod
+CFLAGS-tst-abi-fp64amod.c += -mfp64 -mno-odd-spreg
+endif
+ifneq (,$(filter $(o32-fpabi),xx xxo 64a 64))
+fpabi-modules-names += tst-abi-fp64mod
+CFLAGS-tst-abi-fp64mod.c += -mfp64 -modd-spreg
+endif
+modules-names += $(fpabi-modules-names)
+
+comma:=,
+empty:=
+space:=$(empty) $(empty)
+fpabi_list=$(subst $(space),$(comma),$(patsubst tst-abi-%mod,o_%,\
+				     $(fpabi-modules-names)))
+CPPFLAGS-tst-abi-interlink.c += -DFPABI_LIST=$(fpabi_list)
+CPPFLAGS-tst-abi-interlink.c += -DFPABI_COUNT=$(words $(fpabi-modules-names))
+CPPFLAGS-tst-abi-interlink.c += -DFPABI_NATIVE=o_fp$(o32-fpabi)
+$(objpfx)tst-abi-interlink: $(libdl)
+$(objpfx)tst-abi-interlink.out: $(patsubst %,$(objpfx)%.so,\
+					   $(fpabi-modules-names))
+endif
+
+ifeq ($(mips-mode-switch),yes)
+ifeq ($(o32-fpabi),xx)
+tests += tst-mode-switch-1 tst-mode-switch-2 tst-mode-switch-3
+$(objpfx)tst-mode-switch-1: $(shared-thread-library)
+$(objpfx)tst-mode-switch-2: $(shared-thread-library)
+endif
+endif
+endif
diff --git a/sysdeps/mips/bits/linkmap.h b/sysdeps/mips/bits/linkmap.h
index a6df7821e6..1fb9678a6d 100644
--- a/sysdeps/mips/bits/linkmap.h
+++ b/sysdeps/mips/bits/linkmap.h
@@ -1,4 +1,6 @@
 struct link_map_machine
   {
     ElfW(Addr) plt; /* Address of .plt */
+    ElfW(Word) fpabi; /* FP ABI of the object */
+    unsigned int odd_spreg; /* Does the object require odd_spreg support? */
   };
diff --git a/sysdeps/mips/dl-machine-reject-phdr.h b/sysdeps/mips/dl-machine-reject-phdr.h
new file mode 100644
index 0000000000..b277450c4d
--- /dev/null
+++ b/sysdeps/mips/dl-machine-reject-phdr.h
@@ -0,0 +1,326 @@
+/* Machine-dependent program header inspection for the ELF loader.
+   Copyright (C) 2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _DL_MACHINE_REJECT_PHDR_H
+#define _DL_MACHINE_REJECT_PHDR_H 1
+
+#include <unistd.h>
+#include <sys/prctl.h>
+
+#if defined PR_GET_FP_MODE && defined PR_SET_FP_MODE
+# define HAVE_PRCTL_FP_MODE 1
+#else
+# define HAVE_PRCTL_FP_MODE 0
+#endif
+
+/* Reject an object with a debug message.  */
+#define REJECT(str, args...)						      \
+  {									      \
+    if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_LIBS))		      \
+      _dl_debug_printf (str, ##args);					      \
+    return true;							      \
+  }
+
+/* Search the program headers for the ABI Flags.  */
+
+static inline const ElfW(Phdr) *
+find_mips_abiflags (const ElfW(Phdr) *phdr, ElfW(Half) phnum)
+{
+  const ElfW(Phdr) *ph;
+
+  for (ph = phdr; ph < &phdr[phnum]; ++ph)
+    if (ph->p_type == PT_MIPS_ABIFLAGS)
+      return ph;
+  return NULL;
+}
+
+/* Cache the FP ABI value from the PT_MIPS_ABIFLAGS program header.  */
+
+static bool
+cached_fpabi_reject_phdr_p (struct link_map *l)
+{
+  if (l->l_mach.fpabi == 0)
+    {
+      const ElfW(Phdr) *ph = find_mips_abiflags (l->l_phdr, l->l_phnum);
+
+      if (ph)
+	{
+	  Elf_MIPS_ABIFlags_v0 * mips_abiflags;
+	  if (ph->p_filesz < sizeof (Elf_MIPS_ABIFlags_v0))
+	    REJECT ("   %s: malformed PT_MIPS_ABIFLAGS found\n", l->l_name);
+
+	  mips_abiflags = (Elf_MIPS_ABIFlags_v0 *) (l->l_addr + ph->p_vaddr);
+
+	  if (__glibc_unlikely (mips_abiflags->flags2 != 0))
+	    REJECT ("   %s: unknown MIPS.abiflags flags2: %u\n", l->l_name,
+		    mips_abiflags->flags2);
+
+	  l->l_mach.fpabi = mips_abiflags->fp_abi;
+	  l->l_mach.odd_spreg = (mips_abiflags->flags1
+				 & MIPS_AFL_FLAGS1_ODDSPREG) != 0;
+	}
+      else
+	{
+	  l->l_mach.fpabi = -1;
+	  l->l_mach.odd_spreg = true;
+	}
+    }
+  return false;
+}
+
+/* Return a description of the specified floating-point ABI.  */
+
+static const char *
+fpabi_string (int fpabi)
+{
+  switch (fpabi)
+    {
+    case Val_GNU_MIPS_ABI_FP_ANY:
+      return "Hard or soft float";
+    case Val_GNU_MIPS_ABI_FP_DOUBLE:
+      return "Hard float (double precision)";
+    case Val_GNU_MIPS_ABI_FP_SINGLE:
+      return "Hard float (single precision)";
+    case Val_GNU_MIPS_ABI_FP_SOFT:
+      return "Soft float";
+    case Val_GNU_MIPS_ABI_FP_OLD_64:
+      return "Unsupported FP64";
+    case Val_GNU_MIPS_ABI_FP_XX:
+      return "Hard float (32-bit CPU, Any FPU)";
+    case Val_GNU_MIPS_ABI_FP_64:
+      return "Hard float (32-bit CPU, 64-bit FPU)";
+    case Val_GNU_MIPS_ABI_FP_64A:
+      return "Hard float compat (32-bit CPU, 64-bit FPU)";
+    case -1:
+      return "Double precision, single precision or soft float";
+    default:
+      return "Unknown FP ABI";
+    }
+}
+
+/* A structure to describe the requirements of each FP ABI extension.
+   Each field says whether the ABI can be executed in that mode.  The FR0 field
+   is actually overloaded and means 'default' FR mode for the ABI.  I.e. For
+   O32 it is FR0 and for N32/N64 it is actually FR1.  Since this logic is
+   focussed on the intricacies of mode management for O32 we call the field
+   FR0.  */
+
+struct abi_req
+{
+  bool single;
+  bool soft;
+  bool fr0;
+  bool fr1;
+  bool fre;
+};
+
+/* FP ABI requirements for all Val_GNU_MIPS_ABI_FP_* values.  */
+
+static const struct abi_req reqs[Val_GNU_MIPS_ABI_FP_MAX + 1] =
+    {{true,  true,  true,  true,  true},  /* Any */
+     {false, false, true,  false, true},  /* Double-float */
+     {true,  false, false, false, false}, /* Single-float */
+     {false, true,  false, false, false}, /* Soft-float */
+     {false, false, false, false, false}, /* old-FP64 */
+     {false, false, true,  true,  true},  /* FPXX */
+     {false, false, false, true,  false}, /* FP64 */
+     {false, false, false, true,  true}}; /* FP64A */
+
+/* FP ABI requirements for objects without a PT_MIPS_ABIFLAGS segment.  */
+
+static const struct abi_req none_req = { true, true, true, false, true };
+
+/* Return true iff ELF program headers are incompatible with the running
+   host.  This verifies that floating-point ABIs are compatible and
+   re-configures the hardware mode if necessary.  This code handles both the
+   DT_NEEDED libraries and the dlopen'ed libraries.  It also accounts for the
+   impact of dlclose.  */
+
+static bool __attribute_used__
+elf_machine_reject_phdr_p (const ElfW(Phdr) *phdr, uint_fast16_t phnum,
+			   const char *buf, size_t len, struct link_map *map,
+			   int fd)
+{
+  const ElfW(Phdr) *ph = find_mips_abiflags (phdr, phnum);
+  struct link_map *l;
+  Lmid_t nsid;
+  int in_abi = -1;
+  struct abi_req in_req;
+  Elf_MIPS_ABIFlags_v0 *mips_abiflags = NULL;
+  bool perfect_match = false;
+#if _MIPS_SIM == _ABIO32
+  unsigned int cur_mode = -1;
+# if HAVE_PRCTL_FP_MODE
+  bool cannot_mode_switch = false;
+
+  /* Get the current hardware mode.  */
+  cur_mode = __prctl (PR_GET_FP_MODE);
+# endif
+#endif
+
+  /* Read the attributes section.  */
+  if (ph != NULL)
+    {
+      ElfW(Addr) size = ph->p_filesz;
+
+      if (ph->p_offset + size <= len)
+	mips_abiflags = (Elf_MIPS_ABIFlags_v0 *) (buf + ph->p_offset);
+      else
+	{
+	  mips_abiflags = alloca (size);
+	  __lseek (fd, ph->p_offset, SEEK_SET);
+	  if (__libc_read (fd, (void *) mips_abiflags, size) != size)
+	    REJECT ("   unable to read PT_MIPS_ABIFLAGS\n");
+	}
+
+      if (size < sizeof (Elf_MIPS_ABIFlags_v0))
+	REJECT ("   contains malformed PT_MIPS_ABIFLAGS\n");
+
+      if (__glibc_unlikely (mips_abiflags->flags2 != 0))
+	REJECT ("   unknown MIPS.abiflags flags2: %u\n", mips_abiflags->flags2);
+
+      in_abi = mips_abiflags->fp_abi;
+    }
+
+  /* ANY is compatible with anything.  */
+  perfect_match |= (in_abi == Val_GNU_MIPS_ABI_FP_ANY);
+
+  /* Unknown ABIs are rejected.  */
+  if (in_abi != -1 && in_abi > Val_GNU_MIPS_ABI_FP_MAX)
+    REJECT ("   uses unknown FP ABI: %u\n", in_abi);
+
+  /* Obtain the initial requirements.  */
+  in_req = (in_abi == -1) ? none_req : reqs[in_abi];
+
+  /* Check that the new requirement does not conflict with any currently
+     loaded object.  */
+  for (nsid = 0; nsid < DL_NNS; ++nsid)
+    for (l = GL(dl_ns)[nsid]._ns_loaded; l != NULL; l = l->l_next)
+      {
+	struct abi_req existing_req;
+
+	if (cached_fpabi_reject_phdr_p (l))
+	  return true;
+
+#if _MIPS_SIM == _ABIO32
+	/* A special case arises for O32 FP64 and FP64A where the kernel
+	   pre-dates PT_MIPS_ABIFLAGS.  These ABIs will be blindly loaded even
+	   if the hardware mode is unavailable or disabled.  In this
+	   circumstance the prctl call to obtain the current mode will fail.
+	   Detect this situation here and reject everything.  This will
+	   effectively prevent dynamically linked applications from failing in
+	   unusual ways but there is nothing we can do to help static
+	   applications.  */
+	if ((l->l_mach.fpabi == Val_GNU_MIPS_ABI_FP_64A
+	     || l->l_mach.fpabi == Val_GNU_MIPS_ABI_FP_64)
+	    && cur_mode == -1)
+	  REJECT ("   found %s running in the wrong mode\n",
+		  fpabi_string (l->l_mach.fpabi));
+#endif
+
+	/* Found a perfect match, success.  */
+	perfect_match |= (in_abi == l->l_mach.fpabi);
+
+	/* Unknown ABIs are rejected.  */
+	if (l->l_mach.fpabi != -1 && l->l_mach.fpabi > Val_GNU_MIPS_ABI_FP_MAX)
+	  REJECT ("   found unknown FP ABI: %u\n", l->l_mach.fpabi);
+
+	existing_req = (l->l_mach.fpabi == -1 ? none_req
+			: reqs[l->l_mach.fpabi]);
+
+	/* Merge requirements.  */
+	in_req.soft &= existing_req.soft;
+	in_req.single &= existing_req.single;
+	in_req.fr0 &= existing_req.fr0;
+	in_req.fr1 &= existing_req.fr1;
+	in_req.fre &= existing_req.fre;
+
+	/* If there is at least one mode which is still usable then the new
+	   object can be loaded.  */
+	if (in_req.single || in_req.soft || in_req.fr1 || in_req.fr0
+	    || in_req.fre)
+	  {
+#if _MIPS_SIM == _ABIO32 && HAVE_PRCTL_FP_MODE
+	    /* Account for loaded ABIs which prohibit mode switching.  */
+	    if (l->l_mach.fpabi == Val_GNU_MIPS_ABI_FP_XX)
+	      cannot_mode_switch |= l->l_mach.odd_spreg;
+#endif
+	  }
+	else
+	  REJECT ("   uses %s, already loaded %s\n",
+		  fpabi_string (in_abi),
+		  fpabi_string (l->l_mach.fpabi));
+      }
+
+#if _MIPS_SIM == _ABIO32
+  /* At this point we know that the newly loaded object is compatible with all
+     existing objects but the hardware mode may not be correct.  */
+  if ((in_req.fr1 || in_req.fre || in_req.fr0)
+      && !perfect_match)
+    {
+      if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_LIBS))
+	_dl_debug_printf ("   needs %s%s mode\n", in_req.fr0 ? "FR0 or " : "",
+			  (in_req.fre && !in_req.fr1) ? "FRE" : "FR1");
+
+      /* If the PR_GET_FP_MODE is not supported then only FR0 is available.
+	 If the overall requirements cannot be met by FR0 then reject the
+	 object.  */
+      if (cur_mode == -1)
+	return !in_req.fr0;
+
+# if HAVE_PRCTL_FP_MODE
+      {
+	unsigned int fr1_mode = PR_FP_MODE_FR;
+
+	/* It is not possible to change the mode of a thread which may be
+	   executing FPXX code with odd-singles.  If an FPXX object with
+	   odd-singles is loaded then just check the current mode is OK. This
+	   can be either the FR1 mode or FR0 if the requirements are met by
+	   FR0.  */
+	if (cannot_mode_switch)
+	  return (!(in_req.fre && cur_mode == (PR_FP_MODE_FR | PR_FP_MODE_FRE))
+		  && !(in_req.fr1 && cur_mode == PR_FP_MODE_FR)
+		  && !(in_req.fr0 && cur_mode == 0));
+
+	/* If the overall requirements can be satisfied by FRE but not FR1 then
+	   fr1_mode must become FRE.  */
+	if (in_req.fre && !in_req.fr1)
+	  fr1_mode |= PR_FP_MODE_FRE;
+
+	/* Set the new mode.  Use fr1_mode if the requirements cannot be met by
+	   FR0.  */
+	if (!in_req.fr0)
+	  return __prctl (PR_SET_FP_MODE, fr1_mode) != 0;
+	else if (__prctl (PR_SET_FP_MODE, /* fr0_mode */ 0) != 0)
+	  {
+	    /* Setting FR0 can validly fail on an R6 core so retry with the FR1
+	       mode as a fall back.  */
+	    if (errno != ENOTSUP)
+	      return true;
+
+	    return __prctl (PR_SET_FP_MODE, fr1_mode) != 0;
+	  }
+      }
+# endif /* HAVE_PRCTL_FP_MODE */
+    }
+#endif /* _MIPS_SIM == _ABIO32 */
+
+  return false;
+}
+
+#endif /* dl-machine-reject-phdr.h */
diff --git a/sysdeps/mips/dl-machine.h b/sysdeps/mips/dl-machine.h
index 5000d2a300..b463232067 100644
--- a/sysdeps/mips/dl-machine.h
+++ b/sysdeps/mips/dl-machine.h
@@ -99,6 +99,11 @@ elf_machine_matches_host (const ElfW(Ehdr) *ehdr)
   if ((ehdr->e_flags & EF_MIPS_NAN2008) != ELF_MACHINE_NAN2008)
     return 0;
 
+  /* Ensure that the old O32 FP64 ABI is never loaded, it is not supported
+     on linux.  */
+  if (ehdr->e_flags & EF_MIPS_FP64)
+    return 0;
+
   switch (ehdr->e_machine)
     {
     case EM_MIPS:
diff --git a/sysdeps/mips/tst-abi-fp32mod.c b/sysdeps/mips/tst-abi-fp32mod.c
new file mode 100644
index 0000000000..89ff053893
--- /dev/null
+++ b/sysdeps/mips/tst-abi-fp32mod.c
@@ -0,0 +1,22 @@
+/* Copyright (C) 2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+int
+fp32 (void)
+{
+  return 1;
+}
diff --git a/sysdeps/mips/tst-abi-fp64amod.c b/sysdeps/mips/tst-abi-fp64amod.c
new file mode 100644
index 0000000000..be3d781a14
--- /dev/null
+++ b/sysdeps/mips/tst-abi-fp64amod.c
@@ -0,0 +1,22 @@
+/* Copyright (C) 2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+int
+fp64a (void)
+{
+  return 7;
+}
diff --git a/sysdeps/mips/tst-abi-fp64mod.c b/sysdeps/mips/tst-abi-fp64mod.c
new file mode 100644
index 0000000000..04b5c3600a
--- /dev/null
+++ b/sysdeps/mips/tst-abi-fp64mod.c
@@ -0,0 +1,22 @@
+/* Copyright (C) 2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+int
+fp64 (void)
+{
+  return 6;
+}
diff --git a/sysdeps/mips/tst-abi-fpxxmod.c b/sysdeps/mips/tst-abi-fpxxmod.c
new file mode 100644
index 0000000000..69f73a17f3
--- /dev/null
+++ b/sysdeps/mips/tst-abi-fpxxmod.c
@@ -0,0 +1,22 @@
+/* Copyright (C) 2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+int
+fpxx (void)
+{
+  return 5;
+}
diff --git a/sysdeps/mips/tst-abi-fpxxomod.c b/sysdeps/mips/tst-abi-fpxxomod.c
new file mode 100644
index 0000000000..795973b7f3
--- /dev/null
+++ b/sysdeps/mips/tst-abi-fpxxomod.c
@@ -0,0 +1,22 @@
+/* Copyright (C) 2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+int
+fpxxo (void)
+{
+  return 5 + 100;
+}
diff --git a/sysdeps/mips/tst-abi-interlink.c b/sysdeps/mips/tst-abi-interlink.c
new file mode 100644
index 0000000000..c9a29cce92
--- /dev/null
+++ b/sysdeps/mips/tst-abi-interlink.c
@@ -0,0 +1,844 @@
+/* Copyright (C) 2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sys/prctl.h>
+#include <dlfcn.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdbool.h>
+#include <errno.h>
+
+#if defined PR_GET_FP_MODE && defined PR_SET_FP_MODE
+# define HAVE_PRCTL_FP_MODE 1
+# define FR1_MODE (PR_FP_MODE_FR)
+# define FRE_MODE (PR_FP_MODE_FR | PR_FP_MODE_FRE)
+#else
+# define HAVE_PRCTL_FP_MODE 0
+# define FR1_MODE 0x1
+# define FRE_MODE 0x2
+#endif
+
+#define STR_VAL(VAL) #VAL
+#define N_STR(VAL) STR_VAL(VAL)
+
+#define START_STATE(NAME) 					\
+case s_ ## NAME: 						\
+  {								\
+    switch (obj) 						\
+      {
+
+#define END_STATE						\
+      default:							\
+        return false;						\
+      }								\
+  break;							\
+  }
+
+#define NEXT(OBJ, NEXT_STATE)					\
+case o_ ## OBJ: 						\
+  current_fp_state = s_ ## NEXT_STATE;				\
+  break;
+
+#define NEXT_REQ_FR1(OBJ, NEXT_STATE)				\
+case o_ ## OBJ:							\
+  {								\
+    if (has_fr1)						\
+      current_fp_state = s_ ## NEXT_STATE;			\
+    else							\
+      return false;						\
+  }								\
+  break;
+
+#define NEXT_REQ_FR0(OBJ, NEXT_STATE) 				\
+case o_ ## OBJ:							\
+  {								\
+    if (!is_r6							\
+        || (is_r6 && has_fr1 && has_fre))			\
+      current_fp_state = s_ ## NEXT_STATE;			\
+    else 							\
+      return false;						\
+  }								\
+  break;
+
+#define NEXT_REQ_FRE(OBJ, NEXT_STATE)				\
+case o_ ## OBJ: 						\
+  {								\
+    if (has_fr1 && has_fre)					\
+      current_fp_state = s_ ## NEXT_STATE;			\
+    else							\
+      return false;						\
+  }								\
+  break;
+
+#define NEXT_NO_MODE_CHANGE(OBJ, NEXT_STATE)			\
+case o_ ## OBJ: 						\
+  {								\
+    if (current_mode_valid_p (s_ ## NEXT_STATE))			\
+      {								\
+	current_fp_state = s_ ## NEXT_STATE;			\
+	cant_change_mode = true;				\
+      }								\
+    else							\
+      return false;						\
+  }								\
+  break;
+
+static const char * const shared_lib_names[] =
+  {
+    "tst-abi-fpanymod.so", "tst-abi-fpsoftmod.so", "tst-abi-fpsinglemod.so",
+    "tst-abi-fp32mod.so", "tst-abi-fp64mod.so", "tst-abi-fp64amod.so",
+    "tst-abi-fpxxmod.so", "tst-abi-fpxxomod.so"
+  };
+
+struct fp_mode_req
+{
+  int mode1;
+  int mode2;
+  int mode3;
+};
+
+enum fp_obj
+{
+  o_any,
+  o_soft,
+  o_single,
+  o_fp32,
+  o_fp64,
+  o_fp64a,
+  o_fpxx,
+  o_fpxxo,
+  o_max
+};
+
+enum fp_state
+{
+  s_any,
+  s_soft,
+  s_single,
+  s_fp32,
+  s_fpxx,
+  s_fpxxo,
+  s_fp64a,
+  s_fp64,
+  s_fpxxo_fpxx,
+  s_fp32_fpxx,
+  s_fp32_fpxxo,
+  s_fp32_fpxxo_fpxx,
+  s_fp32_fp64a_fpxx,
+  s_fp32_fp64a_fpxxo,
+  s_fp32_fp64a_fpxxo_fpxx,
+  s_fp64a_fp32,
+  s_fp64a_fpxx,
+  s_fp64a_fpxxo,
+  s_fp64a_fp64,
+  s_fp64a_fp64_fpxx,
+  s_fp64a_fp64_fpxxo,
+  s_fp64a_fpxx_fpxxo,
+  s_fp64a_fp64_fpxxo_fpxx,
+  s_fp64_fpxx,
+  s_fp64_fpxxo,
+  s_fp64_fpxx_fpxxo
+};
+
+
+static int current_fp_mode;
+static bool cant_change_mode = false;
+static bool has_fr1 = false;
+static bool has_fre = false;
+static bool is_r6 = false;
+static unsigned int fp_obj_count[o_max];
+void * shared_lib_ptrs[o_max];
+static enum fp_state current_fp_state = s_any;
+static enum fp_obj test_objects[FPABI_COUNT] = { FPABI_LIST };
+
+/* This function will return the valid FP modes for the specified state.  */
+
+static struct fp_mode_req
+compute_fp_modes (enum fp_state state)
+{
+  struct fp_mode_req requirements;
+
+  requirements.mode1 = -1;
+  requirements.mode2 = -1;
+  requirements.mode3 = -1;
+
+  switch (state)
+    {
+    case s_single:
+      {
+        if (is_r6)
+	  requirements.mode1 = FR1_MODE;
+	else
+	  {
+	    requirements.mode1 = 0;
+	    requirements.mode2 = FR1_MODE;
+	  }
+	break;
+      }
+    case s_fp32:
+    case s_fp32_fpxx:
+    case s_fp32_fpxxo:
+    case s_fp32_fpxxo_fpxx:
+      {
+	if (is_r6)
+	  requirements.mode1 = FRE_MODE;
+	else
+	  {
+	    requirements.mode1 = 0;
+	    requirements.mode2 = FRE_MODE;
+	  }
+	break;
+      }
+    case s_fpxx:
+    case s_fpxxo:
+    case s_fpxxo_fpxx:
+    case s_any:
+    case s_soft:
+      {
+	if (is_r6)
+	  {
+	    requirements.mode1 = FR1_MODE;
+	    requirements.mode2 = FRE_MODE;
+	  }
+	else
+	  {
+	    requirements.mode1 = 0;
+	    requirements.mode2 = FR1_MODE;
+	    requirements.mode3 = FRE_MODE;
+	  }
+	break;
+      }
+    case s_fp64a:
+    case s_fp64a_fpxx:
+    case s_fp64a_fpxxo:
+    case s_fp64a_fpxx_fpxxo:
+      {
+	requirements.mode1 = FR1_MODE;
+	requirements.mode2 = FRE_MODE;
+	break;
+      }
+    case s_fp64:
+    case s_fp64_fpxx:
+    case s_fp64_fpxxo:
+    case s_fp64_fpxx_fpxxo:
+    case s_fp64a_fp64:
+    case s_fp64a_fp64_fpxx:
+    case s_fp64a_fp64_fpxxo:
+    case s_fp64a_fp64_fpxxo_fpxx:
+      {
+	requirements.mode1 = FR1_MODE;
+	break;
+      }
+    case s_fp64a_fp32:
+    case s_fp32_fp64a_fpxx:
+    case s_fp32_fp64a_fpxxo:
+    case s_fp32_fp64a_fpxxo_fpxx:
+      {
+        requirements.mode1 = FRE_MODE;
+        break;
+      }
+    }
+  return requirements;
+}
+
+/* Check the current mode is suitable for the specified state.  */
+
+static bool
+current_mode_valid_p (enum fp_state s)
+{
+  struct fp_mode_req req = compute_fp_modes (s);
+  return (req.mode1 == current_fp_mode
+	  || req.mode2 == current_fp_mode
+	  || req.mode3 == current_fp_mode);
+}
+
+/* Run the state machine by adding a new object.  */
+
+static bool
+set_next_fp_state (enum fp_obj obj)
+{
+  cant_change_mode = false;
+  switch (current_fp_state)
+    {
+
+    START_STATE(soft)
+    NEXT(soft,soft)
+    NEXT(any,soft)
+    END_STATE
+
+    START_STATE(single)
+    NEXT(single,single)
+    NEXT(any,single)
+    END_STATE
+
+    START_STATE(any)
+    NEXT_REQ_FR0(fp32, fp32)
+    NEXT(fpxx, fpxx)
+    NEXT(fpxxo, fpxxo)
+    NEXT_REQ_FR1(fp64a, fp64a)
+    NEXT_REQ_FR1(fp64, fp64)
+    NEXT(any,any)
+    NEXT(soft,soft)
+    NEXT(single,single)
+    END_STATE
+
+    START_STATE(fp32)
+    NEXT_REQ_FR0(fp32,fp32)
+    NEXT(fpxx, fp32_fpxx)
+    NEXT(fpxxo, fp32_fpxxo)
+    NEXT_REQ_FRE(fp64a, fp64a_fp32)
+    NEXT(any,fp32)
+    END_STATE
+
+    START_STATE(fpxx)
+    NEXT_REQ_FR0(fp32, fp32_fpxx)
+    NEXT_REQ_FR1(fp64, fp64_fpxx)
+    NEXT_REQ_FR1(fp64a, fp64a_fpxx)
+    NEXT(fpxxo, fpxxo_fpxx)
+    NEXT(fpxx,fpxx)
+    NEXT(any,fpxx)
+    END_STATE
+
+    START_STATE(fpxxo)
+    NEXT_NO_MODE_CHANGE(fp32, fp32_fpxxo)
+    NEXT_NO_MODE_CHANGE(fp64, fp64_fpxxo)
+    NEXT_NO_MODE_CHANGE(fp64a, fp64a_fpxxo)
+    NEXT_NO_MODE_CHANGE(fpxx, fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fpxxo,fpxxo)
+    NEXT_NO_MODE_CHANGE(any,fpxxo)
+    END_STATE
+
+    START_STATE(fp64a)
+    NEXT_REQ_FRE(fp32, fp64a_fp32)
+    NEXT_REQ_FR1(fp64, fp64a_fp64)
+    NEXT(fpxxo, fp64a_fpxxo)
+    NEXT(fpxx, fp64a_fpxx)
+    NEXT_REQ_FR1(fp64a, fp64a)
+    NEXT(any, fp64a)
+    END_STATE
+
+    START_STATE(fp64)
+    NEXT_REQ_FR1(fp64a, fp64a_fp64)
+    NEXT(fpxxo, fp64_fpxxo)
+    NEXT(fpxx, fp64_fpxx)
+    NEXT_REQ_FR1(fp64, fp64)
+    NEXT(any, fp64)
+    END_STATE
+
+    START_STATE(fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fp32, fp32_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fp64, fp64_fpxx_fpxxo)
+    NEXT_NO_MODE_CHANGE(fp64a, fp64a_fpxx_fpxxo)
+    NEXT_NO_MODE_CHANGE(fpxx, fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fpxxo, fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(any, fpxxo_fpxx)
+    END_STATE
+
+    START_STATE(fp32_fpxx)
+    NEXT_REQ_FR0(fp32, fp32_fpxx)
+    NEXT(fpxx, fp32_fpxx)
+    NEXT(fpxxo, fp32_fpxxo_fpxx)
+    NEXT_REQ_FRE(fp64a, fp32_fp64a_fpxx)
+    NEXT(any, fp32_fpxx)
+    END_STATE
+
+    START_STATE(fp32_fpxxo)
+    NEXT_NO_MODE_CHANGE(fp32, fp32_fpxxo)
+    NEXT_NO_MODE_CHANGE(fpxxo, fp32_fpxxo)
+    NEXT_NO_MODE_CHANGE(fpxx, fp32_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fp64a, fp32_fp64a_fpxxo)
+    NEXT_NO_MODE_CHANGE(any, fp32_fpxxo)
+    END_STATE
+
+    START_STATE(fp32_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fp32, fp32_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fpxxo, fp32_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fpxx, fp32_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fp64a, fp32_fp64a_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(any, fp32_fpxxo_fpxx)
+    END_STATE
+
+    START_STATE(fp64a_fp32)
+    NEXT_REQ_FRE(fp32, fp64a_fp32)
+    NEXT_REQ_FRE(fp64a, fp64a_fp32)
+    NEXT(fpxxo, fp32_fp64a_fpxxo)
+    NEXT(fpxx, fp32_fp64a_fpxx)
+    NEXT(any, fp64a_fp32)
+    END_STATE
+
+    START_STATE(fp64a_fpxx)
+    NEXT_REQ_FRE(fp32, fp32_fp64a_fpxx)
+    NEXT_REQ_FR1(fp64a, fp64a_fpxx)
+    NEXT(fpxx, fp64a_fpxx)
+    NEXT(fpxxo, fp64a_fpxx_fpxxo)
+    NEXT_REQ_FR1(fp64, fp64a_fp64_fpxx)
+    NEXT(any, fp64a_fpxx)
+    END_STATE
+
+    START_STATE(fp64a_fpxxo)
+    NEXT_NO_MODE_CHANGE(fp32, fp32_fp64a_fpxxo)
+    NEXT_NO_MODE_CHANGE(fp64a, fp64a_fpxxo)
+    NEXT_NO_MODE_CHANGE(fpxx, fp64a_fpxx_fpxxo)
+    NEXT_NO_MODE_CHANGE(fpxxo, fp64a_fpxxo)
+    NEXT_NO_MODE_CHANGE(fp64, fp64a_fp64_fpxxo)
+    NEXT_NO_MODE_CHANGE(any, fp64a_fpxxo)
+    END_STATE
+
+    START_STATE(fp64a_fpxx_fpxxo)
+    NEXT_NO_MODE_CHANGE(fp32, fp32_fp64a_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fp64a, fp64a_fpxx_fpxxo)
+    NEXT_NO_MODE_CHANGE(fpxx, fp64a_fpxx_fpxxo)
+    NEXT_NO_MODE_CHANGE(fpxxo, fp64a_fpxx_fpxxo)
+    NEXT_NO_MODE_CHANGE(fp64, fp64a_fp64_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(any, fp64a_fpxx_fpxxo)
+    END_STATE
+
+    START_STATE(fp64_fpxx)
+    NEXT_REQ_FR1(fp64a, fp64a_fp64_fpxx)
+    NEXT(fpxxo, fp64_fpxx_fpxxo)
+    NEXT(fpxx, fp64_fpxx)
+    NEXT_REQ_FR1(fp64, fp64_fpxx)
+    NEXT(any, fp64_fpxx)
+    END_STATE
+
+    START_STATE(fp64_fpxxo)
+    NEXT_NO_MODE_CHANGE(fp64a, fp64a_fp64_fpxxo)
+    NEXT_NO_MODE_CHANGE(fpxxo, fp64_fpxxo)
+    NEXT_NO_MODE_CHANGE(fpxx, fp64_fpxx_fpxxo)
+    NEXT_NO_MODE_CHANGE(fp64, fp64_fpxxo)
+    NEXT_NO_MODE_CHANGE(any, fp64_fpxxo)
+    END_STATE
+
+    START_STATE(fp64_fpxx_fpxxo)
+    NEXT_NO_MODE_CHANGE(fp64a, fp64a_fp64_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fpxxo, fp64_fpxx_fpxxo)
+    NEXT_NO_MODE_CHANGE(fpxx, fp64_fpxx_fpxxo)
+    NEXT_NO_MODE_CHANGE(fp64, fp64_fpxx_fpxxo)
+    NEXT_NO_MODE_CHANGE(any, fp64_fpxx_fpxxo)
+    END_STATE
+
+    START_STATE(fp64a_fp64)
+    NEXT_REQ_FR1(fp64a, fp64a_fp64)
+    NEXT(fpxxo, fp64a_fp64_fpxxo)
+    NEXT(fpxx, fp64a_fp64_fpxx)
+    NEXT_REQ_FR1(fp64, fp64a_fp64)
+    NEXT(any, fp64a_fp64)
+    END_STATE
+
+    START_STATE(fp64a_fp64_fpxx)
+    NEXT_REQ_FR1(fp64a, fp64a_fp64_fpxx)
+    NEXT(fpxxo, fp64a_fp64_fpxxo_fpxx)
+    NEXT(fpxx, fp64a_fp64_fpxx)
+    NEXT_REQ_FR1(fp64, fp64a_fp64_fpxx)
+    NEXT(any, fp64a_fp64_fpxx)
+    END_STATE
+
+    START_STATE(fp64a_fp64_fpxxo)
+    NEXT_NO_MODE_CHANGE(fp64a, fp64a_fp64_fpxxo)
+    NEXT_NO_MODE_CHANGE(fpxx, fp64a_fp64_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fpxxo, fp64a_fp64_fpxxo)
+    NEXT_NO_MODE_CHANGE(fp64, fp64a_fp64_fpxxo)
+    NEXT_NO_MODE_CHANGE(any, fp64a_fp64_fpxxo)
+    END_STATE
+
+    START_STATE(fp64a_fp64_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fp64a, fp64a_fp64_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fpxx, fp64a_fp64_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fpxxo, fp64a_fp64_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fp64, fp64a_fp64_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(any, fp64a_fp64_fpxxo_fpxx)
+    END_STATE
+
+    START_STATE(fp32_fp64a_fpxx)
+    NEXT_REQ_FRE(fp32, fp32_fp64a_fpxx)
+    NEXT_REQ_FRE(fp64a, fp32_fp64a_fpxx)
+    NEXT(fpxxo, fp32_fp64a_fpxxo_fpxx)
+    NEXT(fpxx, fp32_fp64a_fpxx)
+    NEXT(any, fp32_fp64a_fpxx)
+    END_STATE
+
+    START_STATE(fp32_fp64a_fpxxo)
+    NEXT_NO_MODE_CHANGE(fp32, fp32_fp64a_fpxxo)
+    NEXT_NO_MODE_CHANGE(fp64a, fp32_fp64a_fpxxo)
+    NEXT_NO_MODE_CHANGE(fpxx, fp32_fp64a_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fpxxo, fp32_fp64a_fpxxo)
+    NEXT_NO_MODE_CHANGE(any, fp32_fp64a_fpxxo)
+    END_STATE
+
+    START_STATE(fp32_fp64a_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fp32, fp32_fp64a_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fp64a, fp32_fp64a_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fpxx, fp32_fp64a_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(fpxxo, fp32_fp64a_fpxxo_fpxx)
+    NEXT_NO_MODE_CHANGE(any, fp32_fp64a_fpxxo_fpxx)
+    END_STATE
+    }
+
+  if (obj != o_max)
+    fp_obj_count[obj]++;
+
+  return true;
+}
+
+/* Run the state machine by removing an object.  */
+
+static bool
+remove_object (enum fp_obj obj)
+{
+  if (obj == o_max)
+    return false;
+
+  fp_obj_count[obj]--;
+
+  /* We can't change fp state until all the objects
+     of a particular type have been unloaded.  */
+  if (fp_obj_count[obj] != 0)
+    return false;
+
+  switch (current_fp_state)
+    {
+    START_STATE(soft)
+    NEXT(soft,any)
+    END_STATE
+
+    START_STATE(single)
+    NEXT(single,any)
+    END_STATE
+
+    START_STATE(any)
+    NEXT(any,any)
+    END_STATE
+
+    START_STATE(fp32)
+    NEXT (fp32,any)
+    END_STATE
+
+    START_STATE(fpxx)
+    NEXT (fpxx,any)
+    END_STATE
+
+    START_STATE(fpxxo)
+    NEXT (fpxxo,any)
+    END_STATE
+
+    START_STATE(fp64a)
+    NEXT(fp64a, any)
+    END_STATE
+
+    START_STATE(fp64)
+    NEXT(fp64, any)
+    END_STATE
+
+    START_STATE(fpxxo_fpxx)
+    NEXT(fpxx, fpxxo)
+    NEXT(fpxxo, fpxx)
+    END_STATE
+
+    START_STATE(fp32_fpxx)
+    NEXT(fp32, fpxx)
+    NEXT(fpxx, fp32)
+    END_STATE
+
+    START_STATE(fp32_fpxxo)
+    NEXT(fp32, fpxxo)
+    NEXT(fpxxo, fp32)
+    END_STATE
+
+    START_STATE(fp32_fpxxo_fpxx)
+    NEXT(fp32, fpxxo_fpxx)
+    NEXT(fpxxo, fp32_fpxx)
+    NEXT(fpxx, fp32_fpxxo)
+    END_STATE
+
+    START_STATE(fp64a_fp32)
+    NEXT(fp32, fp64a)
+    NEXT(fp64a, fp32)
+    END_STATE
+
+    START_STATE(fp64a_fpxx)
+    NEXT(fp64a, fpxx)
+    NEXT(fpxx, fp64a)
+    END_STATE
+
+    START_STATE(fp64a_fpxxo)
+    NEXT(fp64a, fpxxo)
+    NEXT(fpxxo, fp64a)
+    END_STATE
+
+    START_STATE(fp64a_fpxx_fpxxo)
+    NEXT(fp64a, fpxxo_fpxx)
+    NEXT(fpxx, fp64a_fpxxo)
+    NEXT(fpxxo, fp64a_fpxx)
+    END_STATE
+
+    START_STATE(fp64_fpxx)
+    NEXT(fpxx, fp64)
+    NEXT(fp64, fpxx)
+    END_STATE
+
+    START_STATE(fp64_fpxxo)
+    NEXT(fpxxo, fp64)
+    NEXT(fp64, fpxxo)
+    END_STATE
+
+    START_STATE(fp64_fpxx_fpxxo)
+    NEXT(fp64, fpxxo_fpxx)
+    NEXT(fpxxo, fp64_fpxx)
+    NEXT(fpxx, fp64_fpxxo)
+    END_STATE
+
+    START_STATE(fp64a_fp64)
+    NEXT(fp64a, fp64)
+    NEXT(fp64, fp64a)
+    END_STATE
+
+    START_STATE(fp64a_fp64_fpxx)
+    NEXT(fp64a, fp64_fpxx)
+    NEXT(fpxx, fp64a_fp64)
+    NEXT(fp64, fp64a_fpxx)
+    END_STATE
+
+    START_STATE(fp64a_fp64_fpxxo)
+    NEXT(fp64a, fp64_fpxxo)
+    NEXT(fpxxo, fp64a_fp64)
+    NEXT(fp64, fp64a_fpxxo)
+    END_STATE
+
+    START_STATE(fp64a_fp64_fpxxo_fpxx)
+    NEXT(fp64a, fp64_fpxx_fpxxo)
+    NEXT(fpxx, fp64a_fp64_fpxxo)
+    NEXT(fpxxo, fp64a_fp64_fpxx)
+    NEXT(fp64, fp64a_fpxx_fpxxo)
+    END_STATE
+
+    START_STATE(fp32_fp64a_fpxx)
+    NEXT(fp32, fp64a_fpxx)
+    NEXT(fp64a, fp32_fpxx)
+    NEXT(fpxx, fp64a_fp32)
+    END_STATE
+
+    START_STATE(fp32_fp64a_fpxxo)
+    NEXT(fp32, fp64a_fpxxo)
+    NEXT(fp64a, fp32_fpxxo)
+    NEXT(fpxxo, fp64a_fp32)
+    END_STATE
+
+    START_STATE(fp32_fp64a_fpxxo_fpxx)
+    NEXT(fp32, fp64a_fpxx_fpxxo)
+    NEXT(fp64a, fp32_fpxxo_fpxx)
+    NEXT(fpxx, fp32_fp64a_fpxxo)
+    NEXT(fpxxo, fp32_fp64a_fpxx)
+    END_STATE
+    }
+
+  return true;
+}
+
+static int
+mode_transition_valid_p (void)
+{
+  int prev_fp_mode;
+
+  /* Get the current fp mode.  */
+  prev_fp_mode = current_fp_mode;
+#if HAVE_PRCTL_FP_MODE
+  current_fp_mode = prctl (PR_GET_FP_MODE);
+
+  /* If the prctl call fails assume the core only has FR0 mode support.  */
+  if (current_fp_mode == -1)
+    current_fp_mode = 0;
+#endif
+
+  if (!current_mode_valid_p (current_fp_state))
+    return 0;
+
+  /* Check if mode changes are not allowed but a mode change happened.  */
+  if (cant_change_mode
+      && current_fp_mode != prev_fp_mode)
+    return 0;
+
+  return 1;
+}
+
+/* Load OBJ and check that it was/was not loaded correctly.  */
+bool
+load_object (enum fp_obj obj)
+{
+  bool should_load = set_next_fp_state (obj);
+
+  shared_lib_ptrs[obj] = dlopen (shared_lib_names[obj], RTLD_LAZY);
+
+  /* If we expected an error and the load was successful then fail.  */
+  if (!should_load && (shared_lib_ptrs[obj] != 0))
+    return false;
+
+  if (should_load && (shared_lib_ptrs[obj] == 0))
+    return false;
+
+  if (!mode_transition_valid_p ())
+    return false;
+
+  return true;
+}
+
+/* Remove an object and check the state remains valid.  */
+bool
+unload_object (enum fp_obj obj)
+{
+  if (!shared_lib_ptrs[obj])
+    return true;
+
+  remove_object (obj);
+
+  if (dlclose (shared_lib_ptrs[obj]) != 0)
+    return false;
+
+  shared_lib_ptrs[obj] = 0;
+
+  if (!mode_transition_valid_p ())
+    return false;
+
+  return true;
+}
+
+/* Load every permuation of OBJECTS.  */
+static bool
+test_permutations (enum fp_obj objects[], int count)
+{
+  int i;
+
+  for (i = 0 ; i < count ; i++)
+    {
+      if (!load_object (objects[i]))
+	return false;
+
+      if (count > 1)
+	{
+	  enum fp_obj new_objects[count - 1];
+	  int j;
+	  int k = 0;
+
+	  for (j = 0 ; j < count ; j++)
+	    {
+	      if (j != i)
+		new_objects[k++] = objects[j];
+	    }
+
+	  if (!test_permutations (new_objects, count - 1))
+	    return false;
+	}
+
+      if (!unload_object (objects[i]))
+	return false;
+    }
+  return true;
+}
+
+int
+do_test (void)
+{
+#if HAVE_PRCTL_FP_MODE
+  /* Determine available hardware support and current mode.  */
+  current_fp_mode = prctl (PR_GET_FP_MODE);
+
+  /* If the prctl call fails assume the core only has FR0 mode support.  */
+  if (current_fp_mode == -1)
+    current_fp_mode = 0;
+  else
+    {
+      if (prctl (PR_SET_FP_MODE, 0) != 0)
+	{
+	  if (errno == ENOTSUP)
+	    is_r6 = true;
+	  else
+	    {
+	      printf ("unexpected error from PR_SET_FP_MODE, 0: %m\n");
+	      return 1;
+	    }
+	}
+
+      if (prctl (PR_SET_FP_MODE, PR_FP_MODE_FR) != 0)
+	{
+	  if (errno != ENOTSUP)
+	    {
+	      printf ("unexpected error from PR_SET_FP_MODE, "
+		      "PR_FP_MODE_FR: %m\n");
+	      return 1;
+	    }
+	}
+      else
+	has_fr1 = true;
+
+      if (prctl (PR_SET_FP_MODE, PR_FP_MODE_FR | PR_FP_MODE_FRE) != 0)
+	{
+	  if (errno != ENOTSUP)
+	    {
+	      printf ("unexpected error from PR_SET_FP_MODE, "
+		      "PR_FP_MODE_FR | PR_FP_MODE_FRE: %m\n");
+	      return 1;
+	    }
+	}
+      else
+	has_fre = true;
+
+      if (prctl (PR_SET_FP_MODE, current_fp_mode) != 0)
+	{
+	  printf ("unable to restore initial FP mode: %m\n");
+	  return 1;
+	}
+    }
+
+  if ((is_r6 && !(current_fp_mode & PR_FP_MODE_FR))
+      || (!has_fr1 && (current_fp_mode & PR_FP_MODE_FR))
+      || (!has_fre && (current_fp_mode & PR_FP_MODE_FRE)))
+    {
+      puts ("Inconsistency detected between initial FP mode "
+	    "and supported FP modes\n");
+      return 1;
+    }
+#else
+  current_fp_mode = 0;
+#endif
+
+  /* Set up the initial state from executable and LDSO.  Assumptions:
+     1) All system libraries have the same ABI as ld.so.
+     2) Due to the fact that ld.so is tested by invoking it directly
+        rather than via an interpreter, there is no point in varying
+	the ABI of the test program.  Instead the ABI only varies for
+	the shared libraries which get loaded.  */
+  if (!set_next_fp_state (FPABI_NATIVE))
+    {
+      puts ("Unable to enter initial ABI state\n");
+      return 1;
+    }
+
+  /* Compare the computed state with the hardware state.  */
+  if (!mode_transition_valid_p ())
+    return 1;
+
+  /* Run all possible test permutations.  */
+  if (!test_permutations (test_objects, FPABI_COUNT))
+    {
+      puts ("Mode checks failed\n");
+      return 1;
+    }
+
+  return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../../test-skeleton.c"
diff --git a/sysdeps/mips/tst-mode-switch-1.c b/sysdeps/mips/tst-mode-switch-1.c
new file mode 100644
index 0000000000..eb8d68aae8
--- /dev/null
+++ b/sysdeps/mips/tst-mode-switch-1.c
@@ -0,0 +1,123 @@
+/* Copyright (C) 2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <limits.h>
+#include <sys/prctl.h>
+
+#if __mips_fpr != 0 || _MIPS_SPFPSET != 16
+# error This test requires -mfpxx -mno-odd-spreg
+#endif
+
+/* This test verifies that mode changes do not clobber register state
+   in other threads.  */
+
+static volatile int finished;
+static int mode[6] =
+  {
+    0,
+    PR_FP_MODE_FR,
+    PR_FP_MODE_FR | PR_FP_MODE_FRE,
+    PR_FP_MODE_FR,
+    0,
+    PR_FP_MODE_FR | PR_FP_MODE_FRE
+  };
+
+static void *
+thread_function (void * arg __attribute__ ((unused)))
+{
+  volatile int i = 0;
+  volatile float f = 0.0;
+  volatile double d = 0.0;
+
+  while (!finished)
+    {
+      if ((float) i != f || (double) i != d)
+	{
+	  printf ("unexpected value: i(%d) f(%f) d(%f)\n", i, f, d);
+	  exit (1);
+	}
+
+      if (i == 100)
+	{
+	  i = 0;
+	  f = 0.0;
+	  d = 0.0;
+	}
+
+      i++;
+      f++;
+      d++;
+    }
+  return NULL;
+}
+
+int
+main (void)
+{
+  int count = sysconf (_SC_NPROCESSORS_ONLN);
+  if (count <= 0)
+    count = 1;
+  count *= 4;
+
+  pthread_t th[count];
+  int i;
+  int result = 0;
+
+  for (i = 0; i < count; ++i)
+    if (pthread_create (&th[i], NULL, thread_function, 0) != 0)
+      {
+	printf ("creation of thread %d failed\n", i);
+	exit (1);
+      }
+
+  for (i = 0 ; i < 1000000 ; i++)
+    {
+      if (prctl (PR_SET_FP_MODE, mode[i % 6]) != 0
+	  && errno != ENOTSUP)
+	{
+	  printf ("prctl PR_SET_FP_MODE failed: %m\n");
+	  exit (1);
+	}
+    }
+
+  finished = 1;
+
+  for (i = 0; i < count; ++i)
+    {
+      void *v;
+      if (pthread_join (th[i], &v) != 0)
+	{
+	  printf ("join of thread %d failed\n", i);
+	  result = 1;
+	}
+      else if (v != NULL)
+	{
+	  printf ("join %d successful, but child failed\n", i);
+	  result = 1;
+	}
+      else
+	printf ("join %d successful\n", i);
+    }
+
+  return result;
+}
diff --git a/sysdeps/mips/tst-mode-switch-2.c b/sysdeps/mips/tst-mode-switch-2.c
new file mode 100644
index 0000000000..c328896c2c
--- /dev/null
+++ b/sysdeps/mips/tst-mode-switch-2.c
@@ -0,0 +1,163 @@
+/* Copyright (C) 2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <limits.h>
+#include <pthread.h>
+#include <sys/prctl.h>
+
+#if __mips_fpr != 0 || _MIPS_SPFPSET != 16
+# error This test requires -mfpxx -mno-odd-spreg
+#endif
+
+/* This test verifies that all threads in a process see a mode
+   change when any thread causes a mode change.  */
+
+static int mode[6] =
+  {
+    0,
+    PR_FP_MODE_FR,
+    PR_FP_MODE_FR | PR_FP_MODE_FRE,
+    PR_FP_MODE_FR,
+    0,
+    PR_FP_MODE_FR | PR_FP_MODE_FRE
+  };
+static volatile int current_mode;
+static volatile int finished;
+static pthread_barrier_t barr_ready;
+static pthread_barrier_t barr_cont;
+
+static void *
+thread_function (void * arg __attribute__ ((unused)))
+{
+  while (!finished)
+    {
+      int res = pthread_barrier_wait (&barr_ready);
+
+      if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
+	{
+	  printf ("barrier wait failed: %m\n");
+	  exit (1);
+	}
+
+      int mode = prctl (PR_GET_FP_MODE);
+
+      if (mode != current_mode)
+	{
+	  printf ("unexpected mode: %d != %d\n", mode, current_mode);
+	  exit (1);
+	}
+
+      res = pthread_barrier_wait (&barr_cont);
+
+      if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
+	{
+	  printf ("barrier wait failed: %m\n");
+	  exit (1);
+	}
+    }
+  return NULL;
+}
+
+int
+main (void)
+{
+  int count = sysconf (_SC_NPROCESSORS_ONLN);
+  if (count <= 0)
+    count = 1;
+  count *= 4;
+
+  pthread_t th[count];
+  int i;
+  int result = 0;
+
+  if (pthread_barrier_init (&barr_ready, NULL, count + 1) != 0)
+    {
+      printf ("failed to initialize barrier: %m\n");
+      exit (1);
+    }
+
+  if (pthread_barrier_init (&barr_cont, NULL, count + 1) != 0)
+    {
+      printf ("failed to initialize barrier: %m\n");
+      exit (1);
+    }
+
+  for (i = 0; i < count; ++i)
+    if (pthread_create (&th[i], NULL, thread_function, 0) != 0)
+      {
+	printf ("creation of thread %d failed\n", i);
+	exit (1);
+      }
+
+  for (i = 0 ; i < 7 ; i++)
+    {
+      if (prctl (PR_SET_FP_MODE, mode[i % 6]) != 0)
+	{
+	  if (errno != ENOTSUP)
+	    {
+	      printf ("prctl PR_SET_FP_MODE failed: %m");
+	      exit (1);
+	    }
+	}
+      else
+	current_mode = mode[i % 6];
+
+
+      int res = pthread_barrier_wait (&barr_ready);
+
+      if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
+	{
+	  printf ("barrier wait failed: %m\n");
+	  exit (1);
+	}
+
+      if (i == 6)
+	finished = 1;
+
+      res = pthread_barrier_wait (&barr_cont);
+
+      if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
+	{
+	  printf ("barrier wait failed: %m\n");
+	  exit (1);
+	}
+    }
+
+  for (i = 0; i < count; ++i)
+    {
+      void *v;
+      if (pthread_join (th[i], &v) != 0)
+	{
+	  printf ("join of thread %d failed\n", i);
+	  result = 1;
+	}
+      else if (v != NULL)
+	{
+	  printf ("join %d successful, but child failed\n", i);
+	  result = 1;
+	}
+      else
+	printf ("join %d successful\n", i);
+    }
+
+  return result;
+}
diff --git a/sysdeps/mips/tst-mode-switch-3.c b/sysdeps/mips/tst-mode-switch-3.c
new file mode 100644
index 0000000000..9cc725be1a
--- /dev/null
+++ b/sysdeps/mips/tst-mode-switch-3.c
@@ -0,0 +1,90 @@
+/* Copyright (C) 2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <setjmp.h>
+#include <sys/prctl.h>
+
+#if __mips_fpr != 0 || _MIPS_SPFPSET != 16
+# error This test requires -mfpxx -mno-odd-spreg
+#endif
+
+/* This test verifies that mode changes between a setjmp and longjmp do
+   not corrupt the state of callee-saved registers.  */
+
+static int mode[6] =
+  {
+    0,
+    PR_FP_MODE_FR,
+    PR_FP_MODE_FR | PR_FP_MODE_FRE,
+    PR_FP_MODE_FR,
+    0,
+    PR_FP_MODE_FR | PR_FP_MODE_FRE
+  };
+static jmp_buf env;
+float check1 = 2.0;
+double check2 = 3.0;
+
+int
+main (void)
+{
+  int i;
+  int result = 0;
+
+  for (i = 0 ; i < 7 ; i++)
+    {
+      int retval;
+      register float test1 __asm ("$f20");
+      register double test2 __asm ("$f22");
+
+      /* Hide what we are doing to $f20 and $f22 from the compiler.  */
+      __asm __volatile ("l.s %0,%2\n"
+			"l.d %1,%3\n"
+			: "=f" (test1), "=f" (test2)
+			: "m" (check1), "m" (check2));
+
+      retval = setjmp (env);
+
+      /* Make sure the compiler knows we want to access the variables
+         via the named registers again.  */
+      __asm __volatile ("" : : "f" (test1), "f" (test2));
+
+      if (test1 != check1 || test2 != check2)
+	{
+	  printf ("Corrupt register detected: $20 %f = %f, $22 %f = %f\n",
+		  test1, check1, test2, check2);
+	  result = 1;
+	}
+
+      if (retval == 0)
+	{
+	  if (prctl (PR_SET_FP_MODE, mode[i % 6]) != 0
+	      && errno != ENOTSUP)
+	    {
+	      printf ("prctl PR_SET_FP_MODE failed: %m");
+	      exit (1);
+	    }
+	  longjmp (env, 0);
+	}
+    }
+
+  return result;
+}
diff --git a/sysdeps/unix/sysv/linux/mips/configure b/sysdeps/unix/sysv/linux/mips/configure
index 6db1f80a4f..83f8b13aab 100644
--- a/sysdeps/unix/sysv/linux/mips/configure
+++ b/sysdeps/unix/sysv/linux/mips/configure
@@ -105,6 +105,148 @@ if test -z "$libc_mips_float"; then
   as_fn_error $? "could not determine if compiler is using hard or soft floating point ABI" "$LINENO" 5
 fi
 
+libc_mips_o32_fp=
+
+if test x"$libc_mips_abi" = xo32 -a x"$libc_mips_float" = xhard; then
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+      #if !defined(__mips_fpr)
+      #error Missing FPR sizes
+      #endif
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+        #if (__mips_fpr != 32)
+        #error Not FP32
+        #endif
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  libc_mips_o32_fp=32
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+          #if (__mips_fpr != 0) || !defined(_MIPS_SPFPSET) || (_MIPS_SPFPSET != 16)
+          #error Not FPXX (without odd single-precision registers)
+          #endif
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  libc_mips_o32_fp=xx
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+            #if (__mips_fpr != 0)
+            #error Not FPXX (with odd single precision registers)
+            #endif
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  libc_mips_o32_fp=xxo
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+              #if (__mips_fpr != 64) || !defined(_MIPS_SPFPSET) || (_MIPS_SPFPSET != 16)
+              #error Not FP64A
+              #endif
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  libc_mips_o32_fp=64a
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+                #if (__mips_fpr != 64)
+                #error Not FP64
+                #endif
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  libc_mips_o32_fp=64
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+config_vars="$config_vars
+o32-fpabi = ${libc_mips_o32_fp}"
+
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+    #include <linux/prctl.h>
+    #if !defined(PR_GET_FP_MODE) || !defined(PR_SET_FP_MODE)
+    #error New prctl support for setting FP modes not found
+    #endif
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  libc_mips_mode_switch=yes
+else
+  libc_mips_mode_switch=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+config_vars="$config_vars
+mips-mode-switch = ${libc_mips_mode_switch}"
+
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for grep that handles long lines and -e" >&5
 $as_echo_n "checking for grep that handles long lines and -e... " >&6; }
diff --git a/sysdeps/unix/sysv/linux/mips/configure.ac b/sysdeps/unix/sysv/linux/mips/configure.ac
index c3f217a34f..5039ec969f 100644
--- a/sysdeps/unix/sysv/linux/mips/configure.ac
+++ b/sysdeps/unix/sysv/linux/mips/configure.ac
@@ -44,6 +44,59 @@ if test -z "$libc_mips_float"; then
   AC_MSG_ERROR([could not determine if compiler is using hard or soft floating point ABI])
 fi
 
+libc_mips_o32_fp=
+
+if test x"$libc_mips_abi" = xo32 -a x"$libc_mips_float" = xhard; then
+  AC_COMPILE_IFELSE(
+    [AC_LANG_PROGRAM([
+      #if !defined(__mips_fpr)
+      #error Missing FPR sizes
+      #endif])],
+    [AC_COMPILE_IFELSE(
+      [AC_LANG_PROGRAM([
+        #if (__mips_fpr != 32)
+        #error Not FP32
+        #endif])],
+      [libc_mips_o32_fp=32],
+      [AC_COMPILE_IFELSE(
+        [AC_LANG_PROGRAM([
+          #if (__mips_fpr != 0) || !defined(_MIPS_SPFPSET) || (_MIPS_SPFPSET != 16)
+          #error Not FPXX (without odd single-precision registers)
+          #endif])],
+        [libc_mips_o32_fp=xx],
+        [AC_COMPILE_IFELSE(
+          [AC_LANG_PROGRAM([
+            #if (__mips_fpr != 0)
+            #error Not FPXX (with odd single precision registers)
+            #endif])],
+          [libc_mips_o32_fp=xxo],
+          [AC_COMPILE_IFELSE(
+            [AC_LANG_PROGRAM([
+              #if (__mips_fpr != 64) || !defined(_MIPS_SPFPSET) || (_MIPS_SPFPSET != 16)
+              #error Not FP64A
+              #endif])],
+            [libc_mips_o32_fp=64a],
+            [AC_COMPILE_IFELSE(
+              [AC_LANG_PROGRAM([
+                #if (__mips_fpr != 64)
+                #error Not FP64
+                #endif])],
+              [libc_mips_o32_fp=64],
+              [])])])])])],
+    [])
+fi
+LIBC_CONFIG_VAR([o32-fpabi],[${libc_mips_o32_fp}])
+
+AC_COMPILE_IFELSE(
+  [AC_LANG_PROGRAM([
+    #include <linux/prctl.h>
+    #if !defined(PR_GET_FP_MODE) || !defined(PR_SET_FP_MODE)
+    #error New prctl support for setting FP modes not found
+    #endif])],
+  [libc_mips_mode_switch=yes],
+  [libc_mips_mode_switch=no])
+LIBC_CONFIG_VAR([mips-mode-switch],[${libc_mips_mode_switch}])
+
 AC_CACHE_CHECK([whether the compiler is using the 2008 NaN encoding],
   libc_cv_mips_nan2008, [AC_EGREP_CPP(yes, [dnl
 #ifdef __mips_nan2008
diff --git a/sysdeps/unix/sysv/linux/mips/ldsodefs.h b/sysdeps/unix/sysv/linux/mips/ldsodefs.h
index d7c62f4b9c..70f8f16956 100644
--- a/sysdeps/unix/sysv/linux/mips/ldsodefs.h
+++ b/sysdeps/unix/sysv/linux/mips/ldsodefs.h
@@ -34,7 +34,7 @@ extern void _dl_static_init (struct link_map *map);
 #undef VALID_ELF_ABIVERSION
 #define VALID_ELF_ABIVERSION(osabi,ver)			\
   (ver == 0						\
-   || (osabi == ELFOSABI_SYSV && ver < 2)		\
+   || (osabi == ELFOSABI_SYSV && ver < 4)		\
    || (osabi == ELFOSABI_GNU && ver < LIBC_ABI_MAX))
 
 #endif /* ldsodefs.h */
diff --git a/sysdeps/unix/sysv/linux/mips/libc-abis b/sysdeps/unix/sysv/linux/mips/libc-abis
index f180a03efd..14ff60322a 100644
--- a/sysdeps/unix/sysv/linux/mips/libc-abis
+++ b/sysdeps/unix/sysv/linux/mips/libc-abis
@@ -11,3 +11,6 @@ MIPS_PLT	mips*-*-linux*
 # Unique symbol definitions for C++.
 # Architecture independent, all ELF targets (== all targets)
 UNIQUE
+#
+# MIPS O32 FP64
+MIPS_O32_FP64   mips*-*-linux*