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.

1 files changed, 90 insertions, 0 deletions

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;
+}