libgloss/
* arm/Makefile.in: Include _exit.c in BSPs. Add rdimon-ram.ld.
Build linker scripts instead of spec files for rdimon and rdpmon.
Pass CRT0 ad BSP to arm.sc.
* arm/_exit.c: New file.
* arm/arm.sc: Add STARTUP, GROUP and SEARCH_DIR. Remove defaults
for ROM and RAM.
* arm/crt0.S: Give Thumb-2 symbols function type.
Skip generic Arm init code for Thumb-2.
Add _nmi_isr and _fault_isr.
* arm/libcfunc.c (do_AngelSWI): Remove.
* arm/swi.h (do_AngelSWI): New function.
* arm/syscalls.c (do_AngelSWI): Remove.
(_exit): Remove.
(isatty): New function.
