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, 110 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/arm/sigaction.c b/sysdeps/unix/sysv/linux/arm/sigaction.c
new file mode 100644
index 0000000000..21df885a7a
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/arm/sigaction.c
@@ -0,0 +1,110 @@
+/* Copyright (C) 1997-2014 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 <signal.h>
+#include <string.h>
+
+#include <sysdep.h>
+#include <sys/syscall.h>
+#include <kernel-features.h>
+
+/* The difference here is that the sigaction structure used in the
+   kernel is not the same as we use in the libc.  Therefore we must
+   translate it here.  */
+#include <kernel_sigaction.h>
+
+#define SA_RESTORER	0x04000000
+
+extern void __default_sa_restorer_v1(void);
+extern void __default_sa_restorer_v2(void);
+extern void __default_rt_sa_restorer_v1(void);
+extern void __default_rt_sa_restorer_v2(void);
+#ifdef __ASSUME_SIGFRAME_V2
+# define __default_sa_restorer __default_sa_restorer_v2
+# define __default_rt_sa_restorer __default_rt_sa_restorer_v2
+#else
+# include <ldsodefs.h>
+# define __default_sa_restorer (GLRO(dl_osversion) >= 0x020612	\
+				 ? __default_sa_restorer_v2	\
+				 : __default_sa_restorer_v1)
+# define __default_rt_sa_restorer (GLRO(dl_osversion) >= 0x020612	\
+				    ? __default_rt_sa_restorer_v2	\
+				    : __default_rt_sa_restorer_v1)
+#endif
+
+/* When RT signals are in use we need to use a different return stub.  */
+#define choose_restorer(flags)					\
+  (flags & SA_SIGINFO) ? __default_rt_sa_restorer		\
+  : __default_sa_restorer
+
+/* If ACT is not NULL, change the action for SIG to *ACT.
+   If OACT is not NULL, put the old action for SIG in *OACT.  */
+int
+__libc_sigaction (sig, act, oact)
+     int sig;
+     const struct sigaction *act;
+     struct sigaction *oact;
+{
+  int result;
+
+  struct kernel_sigaction kact, koact;
+
+  if (act)
+    {
+      kact.k_sa_handler = act->sa_handler;
+      memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
+      kact.sa_flags = act->sa_flags;
+#ifdef HAVE_SA_RESTORER
+      if (kact.sa_flags & SA_RESTORER)
+	kact.sa_restorer = act->sa_restorer;
+      else
+	{
+	  kact.sa_restorer = choose_restorer (kact.sa_flags);
+	  kact.sa_flags |= SA_RESTORER;
+	}
+#endif
+    }
+
+  /* XXX The size argument hopefully will have to be changed to the
+     real size of the user-level sigset_t.  */
+  result = INLINE_SYSCALL (rt_sigaction, 4, sig,
+			   act ? &kact : NULL,
+			   oact ? &koact : NULL, _NSIG / 8);
+
+  if (oact && result >= 0)
+    {
+      oact->sa_handler = koact.k_sa_handler;
+      memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
+      oact->sa_flags = koact.sa_flags;
+#ifdef HAVE_SA_RESTORER
+      oact->sa_restorer = koact.sa_restorer;
+#endif
+    }
+  return result;
+}
+libc_hidden_def (__libc_sigaction)
+
+#ifdef WRAPPER_INCLUDE
+# include WRAPPER_INCLUDE
+#endif
+
+#ifndef LIBC_SIGACTION
+weak_alias (__libc_sigaction, __sigaction)
+libc_hidden_weak (__sigaction)
+weak_alias (__libc_sigaction, sigaction)
+#endif