Subject:
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RE: H8/300 Assembler/C interface
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Thu, 19 Apr 2001 13:18:55 GMT
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Viewed:
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1409 times
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Kekoa wrote:
> Somebody correct me if I'm wrong. I just compiled some programs to check
> this. I believe that maybe the *ROM* calling convection is as Ralph
> described, but almost definitely the GCC calling convention is:
>
> - r0, r1, r2 hold parameters from left to right
> - additional parameters are pushed onto the stack before call
> - rightmost parameters are pushed first
> - registers may be joined to pass 32-bit parameters (i.e. r0r1 or r1r2)
> - 32-bit parameters never split between r2 and stack
> - return value in r0 (or r0r1 if 32-bits)
Thanks Kekoa.
One more question, are the other registers r3,r4,r5,r6 considered
volatile across a function call in GCC?
Cheers, Ralph
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Message has 1 Reply:
Message is in Reply To:
 | | Re: H8/300 Assembler/C interface
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| (...) Somebody correct me if I'm wrong. I just compiled some programs to check this. I believe that maybe the *ROM* calling convection is as Ralph described, but almost definitely the GCC calling convention is: - r0, r1, r2 hold parameters from left (...) (24 years ago, 18-Apr-01, to lugnet.robotics.rcx)
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