Patch: Add c6x-uclinux support

[Bernd Schmidt <bernds at codesourcery dot com>]

This patch adds a new target, c6x-uclinux, to the TI C6X port. This uses
a new kind of binary format called DSBT ELF, designed to support shared
libraries on nommu systems. Every object (shared libraries, executables,
dynamic linker) has an index, and a table at the start of the GOT to
provide data segment pointers. The mechanism is similar to the ID
shared-flat format which is used on m68k or Blackfin, but using real ELF
binaries instead of flat ones.

Also included in this patch is support for a new assembler directive,
".scomm", used to better support small-data common symbols as required
by the ABI. There's also a small assembler bugfix for -mgenerate-rel.

This patch does not yet include C++ EH support; I expect Paul Brook will
submit those parts a bit later.


Bernd

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