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GDB support for PowerPC eABI

	The configuration for PowerPC eABI in gdb-4.16 and gdb-4.16.97
doesn't seem to be complete.  tm-ppc-eabi.h overrides the stackframe
offset of the link register, assumes ELF files, and allows
single-stepping, but most definitions are inherited from the RS/6000 AIX
configuration.  Significantly unchanged is find_toc_address_hook() for
calling functions in the inferior.

	The full SVR4 eABI does not use an AIX TOC (and this does not seem
to be aliased to SVR4 GOT support).  The current eABI support looks more
like the preliminary eABI support which mostly was AIX without function
descriptors.

	Is this configuration complete?  Are function calls to the
inferior suppose to work?

Thanks, David