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, 30 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/arm/ucontext_i.sym b/sysdeps/unix/sysv/linux/arm/ucontext_i.sym
new file mode 100644
index 0000000000..306292f1f8
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/arm/ucontext_i.sym
@@ -0,0 +1,30 @@
+#include <inttypes.h>
+#include <signal.h>
+#include <stddef.h>
+#include <sys/ucontext.h>
+
+SIG_BLOCK
+SIG_SETMASK
+
+-- Offsets of the fields in the ucontext_t structure.
+#define ucontext(member)	offsetof (ucontext_t, member)
+#define mcontext(member)	ucontext (uc_mcontext.member)
+
+UCONTEXT_FLAGS			ucontext (uc_flags)
+UCONTEXT_LINK			ucontext (uc_link)
+UCONTEXT_STACK			ucontext (uc_stack)
+UCONTEXT_MCONTEXT		ucontext (uc_mcontext)
+UCONTEXT_SIGMASK		ucontext (uc_sigmask)
+
+UCONTEXT_REGSPACE		ucontext (uc_regspace)
+
+MCONTEXT_TRAP_NO		mcontext (trap_no)
+MCONTEXT_ERROR_CODE		mcontext (error_code)
+MCONTEXT_OLDMASK		mcontext (oldmask)
+MCONTEXT_ARM_R0			mcontext (arm_r0)
+MCONTEXT_ARM_R4			mcontext (arm_r4)
+MCONTEXT_ARM_SP			mcontext (arm_sp)
+MCONTEXT_ARM_LR			mcontext (arm_lr)
+MCONTEXT_ARM_PC			mcontext (arm_pc)
+MCONTEXT_ARM_CPSR		mcontext (arm_cpsr)
+MCONTEXT_FAULT_ADDRESS		mcontext (fault_address)