ppc405gp and GCC register usage

[Wolfgang Denk]

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

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Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
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