Re: [Xen-devel] [PATCH v2 for 4.5] arm32: fix build after 063188f4b3

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 14.10.14 at 15:06, <julien.grall@xxxxxxxxxx> wrote:
> On 10/14/2014 01:57 PM, Ian Campbell wrote:
>> On Tue, 2014-10-14 at 13:43 +0100, Julien Grall wrote:
>>> On 10/14/2014 10:15 AM, Ian Campbell wrote:
>>>> On Mon, 2014-10-13 at 16:29 +0100, Julien Grall wrote:
>>>>> +int do_smc(register_t function_id, ...);
>>>>
>>>> Are you sure that the variadic function calling convention is the same
>>>> as for a regular function call? I'm not entirely clear having read
>>>> AAPCS, it says they are marshalled according to "the standard base". 
>>>
>>> All the parameters fits in a register, so the compiler will effectively
>>> use the first registers to pass arguments.
>> 
>> Does it? Even with variadic functions? It's not unheard of for an ABI to
>> fallback to pushing things onto the stack for such cases, since it works
>> out far easier in stdargs.h.
> 
> You are right, it looks like it's compiler depend how variadic function
> will be called.

Now that should never happen - there ought to be an ABI that all
compilers abide by.

Jan


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