Provides replacement VDSO with sigreturn trampolines
(__kernel_sigreturn, __kernel_rt_sigreturn) and syscall stubs
(clock_gettime, clock_gettime64, clock_getres, gettimeofday).
Both LE and BE blobs are committed and selected at compile time via
TARGET_BIG_ENDIAN. The BE variant requires an sh4eb-unknown-linux-gnu
toolchain; sh4-unknown-linux-gnu does not support -mb.
CFI register numbers follow GCC's SH_DEBUGGER_REGNO:
PR=17, GBR=18, MACH=20, MACL=21, FPUL=23, FPSCR=24, FR0-15=25-40.
Signed-off-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>