The Natural Philosopher  writes:
> On 08/03/18 17:33, mm0fmf wrote:
>> On 08/03/2018 15:27, Martin Gregorie wrote:
>>> On Thu, 08 Mar 2018 13:34:57 +0000, The Natural Philosopher wrote:
>>>> I would at least put in a bit more
>>>>
>>>> int myfunction(int bufflth, char* buff)
>>>>      {
>>>>         return (int)buff[bufflth-1];
>>>>      }
>>>>
>>>> So you know where on the stack buff and bufflth are...
>>>
>>> Why would you want to know that? All the assembler operations using the
>>> arguments will be inside myfunction() and, unless the code is calculating
>>> a result to be returned and used elsewhere, the returned value is
>>> probably to report success or failure.
>>>
>>
>> If it returns success or failure, why return 1 of 4 billion possible
>> values?
>
> Another personm who has never coded assmebler for C..
>
> It not what you are rurining, its how to access (bufflth, char* buff)
> which are LOCAL stack based variables.

The first few args are passed in registers on many modern systems. See
e.g.
http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042f/IHI0042F_aapcs.pdf
for instance.

--
https://www.greenend.org.uk/rjk/

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