Firmware calling convention - General Discussion and Assistance - CHDK Forum
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Firmware calling convention

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Offline RaduP

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Firmware calling convention
« on: 17 / October / 2009, 03:47:58 »
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It seems to me that some functions from the firmware pass arguments by registers (most of them), but some use the stack as well (and registers too).
So when the parameters are passed by registers, parameter 1 is r0, parameter 2 is r1, and so on, right?

Now, can someone explain why sometimes the stack is used as well?
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Offline reyalp

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Re: Firmware calling convention
« Reply #1 on: 17 / October / 2009, 04:34:24 »
« Last Edit: 17 / October / 2009, 04:36:48 by reyalp »
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Don't forget what the H stands for.
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Offline RaduP

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Re: Firmware calling convention
« Reply #2 on: 17 / October / 2009, 05:58:38 »
Oh, ok, thanks for the links!
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