Move arm from ports to libc.

I've moved the ARM port from ports to the main sysdeps hierarchy.
Beyond the README update, the move of the files was simply

git mv ports/sysdeps/arm sysdeps/arm
git mv ports/sysdeps/unix/arm sysdeps/unix/arm
git mv ports/sysdeps/unix/sysv/linux/arm sysdeps/unix/sysv/linux/arm

and in addition to the ChangeLog entries here, I put a note at the top
of ports/ChangeLog.arm similar to that at the top of
ChangeLog.powerpc.  There is deliberately no NEWS change, as I think
it makes the most sense to put in a general note above all ports
having moved if we can achieve that for 2.20.

Tested that disassembly of installed shared libraries for arm is the
same before and after this patch, except for data (not instructions)
in ld.so (there are assertions in sysdeps/arm/dl-machine.h, and the
path by which that file is found, and so by which it appears in the
assertion message, changes as a result of the move).

	* sysdeps/arm: Move directory from ports/sysdeps/arm.
	* sysdeps/unix/arm: Move directory from ports/sysdeps/unix/arm.
	* sysdeps/unix/sysv/linux/arm: Move directory from
	ports/sysdeps/unix/sysv/linux/arm.
	* README: Update listing for arm-*-linux-gnueabi.

ports/ChangeLog.arm:
	* sysdeps/arm: Move directory to ../sysdeps/arm.
	* sysdeps/unix/arm: Move directory to ../sysdeps.arm.
	* sysdeps/unix/sysv/linux/arm: Move directory to
	../sysdeps/unix/sysv/linux/arm.

1 files changed, 106 insertions, 0 deletions

diff --git a/sysdeps/arm/fraiseexcpt.c b/sysdeps/arm/fraiseexcpt.c
new file mode 100644
index 0000000000..8b320651eb
--- /dev/null
+++ b/sysdeps/arm/fraiseexcpt.c
@@ -0,0 +1,106 @@
+/* Raise given exceptions.
+   Copyright (C) 2004-2014 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 <fpu_control.h>
+#include <fenv.h>
+#include <float.h>
+#include <arm-features.h>
+
+
+int
+feraiseexcept (int excepts)
+{
+  if (ARM_HAVE_VFP)
+    {
+      int fpscr;
+      const float fp_zero = 0.0, fp_one = 1.0, fp_max = FLT_MAX,
+                  fp_min = FLT_MIN, fp_1e32 = 1.0e32f, fp_two = 2.0,
+		  fp_three = 3.0;
+
+      /* Raise exceptions represented by EXPECTS.  But we must raise only
+	 one signal at a time.  It is important that if the overflow/underflow
+	 exception and the inexact exception are given at the same time,
+	 the overflow/underflow exception follows the inexact exception.  After
+	 each exception we read from the fpscr, to force the exception to be
+	 raised immediately.  */
+
+      /* There are additional complications because this file may be compiled
+         without VFP support enabled, and we also can't assume that the
+	 assembler has VFP instructions enabled. To get around this we use the
+	 generic coprocessor mnemonics and avoid asking GCC to put float values
+	 in VFP registers.  */
+
+      /* First: invalid exception.  */
+      if (FE_INVALID & excepts)
+	__asm__ __volatile__ (
+	  "ldc p10, cr0, %1\n\t"                        /* flds s0, %1  */
+	  "cdp p10, 8, cr0, cr0, cr0, 0\n\t"            /* fdivs s0, s0, s0  */
+	  "mrc p10, 7, %0, cr1, cr0, 0" : "=r" (fpscr)  /* fmrx %0, fpscr  */
+			                : "m" (fp_zero)
+					: "s0");
+
+      /* Next: division by zero.  */
+      if (FE_DIVBYZERO & excepts)
+	__asm__ __volatile__ (
+	  "ldc p10, cr0, %1\n\t"                        /* flds s0, %1  */
+	  "ldcl p10, cr0, %2\n\t"                       /* flds s1, %2  */
+	  "cdp p10, 8, cr0, cr0, cr0, 1\n\t"            /* fdivs s0, s0, s1  */
+	  "mrc p10, 7, %0, cr1, cr0, 0" : "=r" (fpscr)  /* fmrx %0, fpscr  */
+			                : "m" (fp_one), "m" (fp_zero)
+					: "s0", "s1");
+
+      /* Next: overflow.  */
+      if (FE_OVERFLOW & excepts)
+	/* There's no way to raise overflow without also raising inexact.  */
+	__asm__ __volatile__ (
+	  "ldc p10, cr0, %1\n\t"                        /* flds s0, %1  */
+	  "ldcl p10, cr0, %2\n\t"                       /* flds s1, %2  */
+	  "cdp p10, 3, cr0, cr0, cr0, 1\n\t"            /* fadds s0, s0, s1  */
+	  "mrc p10, 7, %0, cr1, cr0, 0" : "=r" (fpscr)  /* fmrx %0, fpscr  */
+			                : "m" (fp_max), "m" (fp_1e32)
+					: "s0", "s1");
+
+      /* Next: underflow.  */
+      if (FE_UNDERFLOW & excepts)
+	__asm__ __volatile__ (
+	  "ldc p10, cr0, %1\n\t"                        /* flds s0, %1  */
+	  "ldcl p10, cr0, %2\n\t"                       /* flds s1, %2  */
+	  "cdp p10, 8, cr0, cr0, cr0, 1\n\t"            /* fdivs s0, s0, s1  */
+	  "mrc p10, 7, %0, cr1, cr0, 0" : "=r" (fpscr)  /* fmrx %0, fpscr  */
+			                : "m" (fp_min), "m" (fp_three)
+					: "s0", "s1");
+
+      /* Last: inexact.  */
+      if (FE_INEXACT & excepts)
+	__asm__ __volatile__ (
+	  "ldc p10, cr0, %1\n\t"                        /* flds s0, %1  */
+	  "ldcl p10, cr0, %2\n\t"                       /* flds s1, %2  */
+	  "cdp p10, 8, cr0, cr0, cr0, 1\n\t"            /* fdivs s0, s0, s1  */
+	  "mrc p10, 7, %0, cr1, cr0, 0" : "=r" (fpscr)  /* fmrx %0, fpscr  */
+			                : "m" (fp_two), "m" (fp_three)
+					: "s0", "s1");
+
+      /* Success.  */
+      return 0;
+    }
+
+  /* Unsupported, so fail unless nothing needs to be done.  */
+  return (excepts != 0);
+}
+
+libm_hidden_def (feraiseexcept)