[U-Boot-Users] [PATCH] Add call command on PPC

[Kumar Gala]

On Feb 15, 2008, at 12:32 AM, Mike Frysinger wrote:

> On Friday 15 February 2008, Kumar Gala wrote:
>> On Feb 14, 2008, at 11:54 PM, Mike Frysinger wrote:
>>> On Friday 15 February 2008, Kumar Gala wrote:
>>>> --- /dev/null
>>>> +++ b/lib_ppc/cmd_call.c
>>>
>>> there's nothing ppc specific about this
>>
>> I'm not familiar w/other architecture ABIs to say if that's true or
>> not.  Clearly the upper limit may vary based on the differences in  
>> the
>> ABIs.
>
> if the code were written in assembly, i'd agree.  you've written it  
> in pure C
> though, so the compiler worries about the ABI.  if your ABI has  
> different
> semantics for function pointers than normal function calls, it's a  
> piece of
> crap.  i dont think any ports of u-boot need worry about this.

agreed there.

The main reason for me doing this was to provide a "generic" mechanism  
that mimic how we boot kernels on PPC.

The other issue w/providing this on all arch's is that the number of  
params passed via regs may vary and I don't know what is for arm,  
avr32, blackfin, i386, m68k, microblaze, mips, nios, nios2, and sh.

and each variation will require a different prototype.

if someone can tell me what the number of args are for each arch we  
can see about providing this everywhere.

- k