In message <200307151224.04020.jbeisert at eurodsn.de> you wrote:
>
> does someone know, which register I can use in my own assembler routines
> without disturbing code generated by gcc (in kernel space)? I did not found
> any spec which registers gcc use, yet. Is such a document available?
See the (E)ABI specifications for the PowerPC architecture, and GCC
source code.
For PowerPC, the following registers have specific use:
R1: stack pointer
R2: TOC pointer
R3-R4: parameter passing and return values
R5-R10: parameter passing
R13: small data area pointer
R30: GOT pointer
R31: frame pointer
Best regards,
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de
Life would be so much easier if we could just look at the source
code. -- Dave Olson
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