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, 100 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/arm/nptl/unwind-resume.c b/sysdeps/unix/sysv/linux/arm/nptl/unwind-resume.c
new file mode 100644
index 0000000000..bff3e2b4f1
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/arm/nptl/unwind-resume.c
@@ -0,0 +1,100 @@
+/* Copyright (C) 2003-2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jakub Jelinek <jakub@redhat.com>.
+
+   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 <dlfcn.h>
+#include <stdio.h>
+#include <unwind.h>
+
+static void (*libgcc_s_resume) (struct _Unwind_Exception *exc);
+static _Unwind_Reason_Code (*libgcc_s_personality)
+  (_Unwind_State, struct _Unwind_Exception *, struct _Unwind_Context *);
+
+static void init (void) __attribute_used__;
+
+static void
+init (void)
+{
+  void *resume, *personality;
+  void *handle;
+
+  handle = __libc_dlopen ("libgcc_s.so.1");
+
+  if (handle == NULL
+      || (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL
+      || (personality = __libc_dlsym (handle, "__gcc_personality_v0")) == NULL)
+    __libc_fatal ("libgcc_s.so.1 must be installed for pthread_cancel to work\n");
+
+  libgcc_s_resume = resume;
+  libgcc_s_personality = personality;
+}
+
+/* It's vitally important that _Unwind_Resume not have a stack frame; the
+   ARM unwinder relies on register state at entrance.  So we write this in
+   assembly.  */
+
+#define STR1(S) #S
+#define STR(S)  STR1(S)
+
+asm (
+"	.globl	_Unwind_Resume\n"
+"	.type	_Unwind_Resume, %function\n"
+"_Unwind_Resume:\n"
+"	.cfi_sections .debug_frame\n"
+"	" CFI_STARTPROC "\n"
+"	push	{r4, r5, r6, lr}\n"
+"	" CFI_ADJUST_CFA_OFFSET (16)" \n"
+"	" CFI_REL_OFFSET (r4, 0) "\n"
+"	" CFI_REL_OFFSET (r5, 4) "\n"
+"	" CFI_REL_OFFSET (r6, 8) "\n"
+"	" CFI_REL_OFFSET (lr, 12) "\n"
+"	" CFI_REMEMBER_STATE "\n"
+"	ldr	r4, 1f\n"
+"	ldr	r5, 2f\n"
+"3:	add	r4, pc, r4\n"
+"	ldr	r3, [r4, r5]\n"
+"	mov	r6, r0\n"
+"	cmp	r3, #0\n"
+"	beq	4f\n"
+"5:	mov	r0, r6\n"
+"	pop	{r4, r5, r6, lr}\n"
+"	" CFI_ADJUST_CFA_OFFSET (-16) "\n"
+"	" CFI_RESTORE (r4) "\n"
+"	" CFI_RESTORE (r5) "\n"
+"	" CFI_RESTORE (r6) "\n"
+"	" CFI_RESTORE (lr) "\n"
+"	bx	r3\n"
+"	" CFI_RESTORE_STATE "\n"
+"4:	bl	init\n"
+"	ldr	r3, [r4, r5]\n"
+"	b	5b\n"
+"	" CFI_ENDPROC "\n"
+"	.align 2\n"
+"1:	.word	_GLOBAL_OFFSET_TABLE_ - 3b - " STR (PC_OFS) "\n"
+"2:	.word	libgcc_s_resume(GOTOFF)\n"
+"	.size	_Unwind_Resume, .-_Unwind_Resume\n"
+);
+
+_Unwind_Reason_Code
+__gcc_personality_v0 (_Unwind_State state,
+		      struct _Unwind_Exception *ue_header,
+		      struct _Unwind_Context *context)
+{
+  if (__builtin_expect (libgcc_s_personality == NULL, 0))
+    init ();
+  return libgcc_s_personality (state, ue_header, context);
+}