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Diffstat (limited to 'c/src/exec/score/cpu/powerpc/README')
-rw-r--r-- | c/src/exec/score/cpu/powerpc/README | 71 |
1 files changed, 0 insertions, 71 deletions
diff --git a/c/src/exec/score/cpu/powerpc/README b/c/src/exec/score/cpu/powerpc/README deleted file mode 100644 index fc0dd9c7d7..0000000000 --- a/c/src/exec/score/cpu/powerpc/README +++ /dev/null @@ -1,71 +0,0 @@ -# -# $Id$ -# - -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 |