Re: [arm-gnu] passing variables to main()

[JJ <alchemistmba@xxxxxxxxx>]

I figured it out.
r0 is argc, r1 is argv.

I created a memory location and filled it with the variables I want to
pass to main. I set up r0 to <number of vars> and r1 with the address
of this memory location.

In the main(), I can access argc and argv in the regular fashion.

val1 = argv[0]
val1 = argv[1]
..
..

JJ

On Wed, Nov 4, 2009 at 2:52 PM, JJ <alchemistmba@xxxxxxxxx> wrote:
> I renamed the main() to my_main() and changed the call in _start to
> "my_main()" but the linker complains:
>
> undefined reference to `my_main()'
>
> JJ
>
> On Wed, Nov 4, 2009 at 2:36 PM, Charles Manning <manningc2@xxxxxxxxxxxxx> wrote:
>> On Thursday 05 November 2009 08:34:47 JJ wrote:
>>> Hi,
>>>
>>> I need to pass values to main() when I invoke it from my _start
>>> assembly function. I can set the values I want to pass to main in the
>>> registers r1, r2, r3 etc. But I cannot create a main() with that takes
>>> custom parameters:
>>>
>>> The compiler does not like:
>>> int main(unsigned long long val1, unsigned long long val2, ...)
>>>
>>> It requires the default main that takes argv, argc:
>>> int main(int argc, char *argv)
>>>
>>> Any suggestions on a better way to pass the values in?
>>
>> Don't use main() :-)
>>
>> I use something like MyMain(...) which I can set up to be anything I want.
>>
>> If the code is portable (ie might also get built as a Linux or PC application)
>> then I will set up a main() that then calls MyMain()
>>
>>
>>
>