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Old 06 April 2020, 23:54   #9
PPC Hacker

Join Date: Mar 2012
Location: Leiden / The Netherlands
Posts: 1,356
I have another registers related question and this is more for the 68K backend but it is WarpOS related:

I see in the original powerpc.library that all registers are saved on the stack except d0. I now also see that some WarpOS programs from the WarpOS distribution itself rely on this (e.g. CyberPi). They use but don't save d1 before calling RunPPC and use it again after. This works with the original powerpc.library, but in C d1 (and a0 and a1) are not saved as they are volatile.

For optimal compatibility I also need to save those registers and I want it to do without asm. I looked through the vbcc manual but cannot find anything on this. Is this possible?
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