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Luzarius
Joined: 29 Jun 2006
Posts: 2
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 Posted: Thu Jun 29, 2006 9:33 am Post subject: EE-GCC and EE-G++ caling conventions |
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I want to call c++ or c functions compiled with e-gcc or e-g++ from my assembly code but i am not sure how the compilers handle passing of arguments and return values.
Do they use the stack or registers $a0-$a3 and $v0-$v1 ?
a simple test program compiled with the -S assembly source option showed that it uses the registers but a few online message boards say GCC compilers use the stack.
Does this differ depending on how many arguments there are?
I'd be grateful for any information on this or a link to an article that covers this. thanks. |
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Drakonite
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Joined: 17 Jan 2004
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| Posted: Thu Jun 29, 2006 9:39 am Post subject: Re: EE-GCC and EE-G++ caling conventions |
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| Luzarius wrote: |
Does this differ depending on how many arguments there are?
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Yep. Specifically the first so many arguments are in registers, then if they are more they go on the stack.
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Luzarius
Joined: 29 Jun 2006
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| Posted: Thu Jun 29, 2006 9:44 am Post subject: |
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| Cool thanks. Also i should ask if these compilers follow the convention of not messing with registers $s0-$s7 or at least restoring them before returning to the caller. |
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Drakonite
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| Posted: Thu Jun 29, 2006 10:01 am Post subject: |
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Thats part of the MIPS ABI so I would assume it does ;)
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