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authorJoel Sherrill <joel.sherrill@OARcorp.com>1999-12-02 14:31:19 +0000
committerJoel Sherrill <joel.sherrill@OARcorp.com>1999-12-02 14:31:19 +0000
commitacc25eec35e186abc118b9ca4f097e22fc6b4846 (patch)
tree7fa75871c51372e70cbd9cb50b0a2fab55cfa750 /c/src/lib/libbsp/powerpc/support/old_exception_processing/README
parentMerged of mcp750 and mvme2307 BSP by Eric Valette <valette@crf.canon.fr>. (diff)
downloadrtems-acc25eec35e186abc118b9ca4f097e22fc6b4846.tar.bz2
Merged of mcp750 and mvme2307 BSP by Eric Valette <valette@crf.canon.fr>.
As part of this effort, the mpc750 libcpu code is now shared with the ppc6xx.
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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.
+
+This port was later updated by Joel Sherrill <joel@OARcorp.com>
+to test the support for the PPC603, PPC603e, and MPC604. This
+was tested on the PowerPC simulator PSIM and a VMEbus single board
+computer.
+
+2) CPU support.
+
+This release fully supports the PPC403GA, PPC403GB, PPC603, PPC603e,
+MPC604, MPC750, and numerous MPC8xx processors. A good faith attempt
+has been made to include support other models based upon available
+documentation including the MPC5xx. There are two interrupt structures
+supported by the PowerPC port. The newer structure is supported by
+all the MPC750 and MPC604 BSPs. This structure is required to use
+the RDBG remote debugging support.
+
+This port was originally written and tested on the PPC403GA (using
+software floating point). Current ports are tested primarily on
+60x CPUs using the PowerPC simulator PSIM.
+
+Andrew Bray received assistance during the initial porting effort
+from IBM and Blue Micro and we would like to gratefully acknowledge
+that help.
+
+The support for the PPC602 processor is incomplete as only sketchy
+data is currently available. Perhaps this model has been dropped.
+
+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.
+
+The RTEMS PowerPC port supports EABI as the primary ABI. The powerpc-rtems
+GNU toolset configuration is EABI.
+
+Andrew Bray, 4 December 1995
+Joel Sherrill, 16 July 1997