[PATCH arm] synchronize newlib/libc/sys/arm with libgloss/arm

[Bin Cheng]

Hi,
I am synchronizing the newlib/libc/sys/arm with libgloss/arm.
The arm.h and crt0.S have already been synced, here comes this patch
finishing the work.

It is basically straight forward copying from libgloss/arm to
newlib/libc/sys/arm.
As for the changes of newlib/libc/sys/arm itself, it includes:
1, synchronize the implementation of existing functions from libgloss, most
in syscalls.c;
2, add posix library functions in libc/sys/libcfunc.c by copying it from
libgloss, such as clock/isatty, etc.;
3, reorganize the source files, for example, spilt _exit.c/_kill.c from
syscalls.c as libgloss;
4, keep aeabi_atexit.c;
5, minor code changes...

I tested it by configuring newlib with “--enable-newlib-supplied-syscalls”
and building newlib
for various arm targets successfully.

Is it OK?

Thanks

2011-11-07  Bin Cheng  <bin.cheng@arm.com>

	* libc/sys/arm/syscalls.c: Synchronize from libgloss/arm/syscalls.c.
	* libc/sys/arm/libcfunc.c: Synchronize from libgloss/arm/libcfunc.c.
	* libc/sys/arm/trap.S: Synchronize from libgloss/arm/trap.S.
	* libc/sys/arm/swi.h: Synchronize from libgloss/arm/swi.h.
	* libc/sys/arm/_exit.c: New file, Synchronize from
libgloss/arm/_exit.c.
	* libc/sys/arm/_kill.c: New file, Synchronize from
libgloss/arm/_kill.c.
	* libc/sys/arm/Makefile.am (extra_objs): Add _exit.o and _kill.o.
	(EXTRA_lib_a_SOURCES): Add _exit.c and _kill.c.
	* libc/sys/arm/Makefile.in: Regenerate. 
	* libgloss/arm/syscals.c (_lseek): Add return type.