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-#
-# $Id$
-#
-
-There are various issues regarding this port:
-
-
-
-1) Legal
-
-This port is written by Andrew Bray <andy@i-cubed.co.uk>, and
-is copyright 1995 i-cubed ltd.
-
-
-
-2) CPU support.
-
-This release fully supports the IBM PPC403GA and PPC403GB processors.
-
-It has only been tested on the PPC403GA (using software floating
-point).
-
-With the gratefully acknowledged assistance of IBM and Blue Micro,
-this release contains code to support the following processors
- PPC601, PPC603, PPC603e, PPC604, and PPC602.
-
-The support for these processors is incomplete, especially that for
-the PPC602 for which only sketchy data is currently available.
-
-
-
-3) Application Binary INterface
-
-In the context of RTEMS, the ABI is of interest for the following
-aspects:
-
-a) Register usage. Which registers are used to provide static variable
- linkage, stack pointer etc.
-
-b) Function calling convention. How parameters are passed, how function
- variables should be invoked, how values are returned, etc.
-
-c) Stack frame layout.
-
-I am aware of a number of ABIs for the PowerPC:
-
-a) The PowerOpen ABI. This is the original Power ABI used on the RS/6000.
- This is the only ABI supported by versions of GCC before 2.7.0.
-
-b) The SVR4 ABI. This is the ABI defined by SunSoft for the Solaris port
- to the PowerPC.
-
-c) The Embedded ABI. This is an embedded ABI for PowerPC use, which has no
- operating system interface defined. It is promoted by SunSoft, Motorola,
- and Cygnus Support. Cygnus are porting the GNU toolchain to this ABI.
-
-d) GCC 2.7.0. This compiler is partway along the road to supporting the EABI,
- but is currently halfway in between.
-
-This port was built and tested using the PowerOpen ABI, with the following
-caveat: we used an ELF assembler and linker. So some attention may be required
-on the assembler files to get them through a traditional (XCOFF) PowerOpen
-assembler.
-
-This port contains support for the other ABIs, but this may prove to be incomplete
-as it is untested.
-
-In the long term, the RTEMS PowerPC port should move to the EABI as its primary
-or only port. This should wait on a true EABI version of GCC.
-
-Andrew Bray 4/December/1995