uClibc patches for sh-2

[Mark Shinwell]

I have developed the attached patch that permits uClibc to work
correctly with sh-2 processors.  (Paul, this requires Sato-san's kernel
patches.)

I'd like to obtain some feedback as to whether a patch like this is going
to be acceptable.  If it is, then I will test it on the uClibc trunk --
although it might be best to wait until the kernel patches mentioned above
are merged into the main tree.  Currently, the patch has been thoroughly
tested with a previous version of uClibc, and does indeed work correctly
there.

Mark

--

2006-10-16  Mark Shinwell  <shinwell at codesourcery.com>

         * Rules.mak: Don't use -msoft-float for sh-2.
         * libc/sysdeps/linux/sh/vfork.S: Use __SH_SYSCALL_TRAP_BASE.
         Also use __CONFIG_SH2__ rather than __sh2__, for consistency.
         * libc/sysdeps/linux/sh/syscall.c: Use __SH_SYSCALL_TRAP_BASE.
         * libc/sysdeps/linux/sh/bits/uClibc_arch_features.h: Use
         __CONFIG_SH2__ rather than __sh2__, for consistency.
         * libc/sysdeps/linux/sh/bits/syscalls.h (__SH_SYSCALL_TRAP_BASE): New.
         Use instead of hard-coded trap numbers in the various __NR_<name>
         macros.
         * libc/sysdeps/linux/sh/clone.S: Use __SH_SYSCALL_TRAP_BASE.
         Also use __CONFIG_SH2__ rather than __sh2__, for consistency.
         * libc/sysdeps/linux/sh/crti.S: Disable GOT-related code if
         __HAVE_SHARED__ is not set.
         * libc/sysdeps/linux/sh/crt1.S: Force dynamic loader finalization
         function pointer to NULL if __ARCH_HAS_NO_MMU__ is not set.
         * libc/sysdeps/linux/sh/pipe.c (pipe): Use __SH_SYSCALL_TRAP_BASE.
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