[OpenWrt-Devel] uClibc bug: epoll_pwait broken on OpenWrt x86

[Matthias Schiffer]

On 09/16/2014 04:34 PM, Bernhard Reutner-Fischer wrote:
> On 15 September 2014 17:33, Matthias Schiffer
> <mschiffer at universe-factory.net> wrote:
>> Ping? I'd like to get this fixed as soon as possible (even though it's
>> probably too late for the OpenWrt BB final?). I guess I can try to write
>> a patch, but I had hoped someone on these lists could give some advice
>> on what the best way to fix this would be...
> 
> You could stuff the 6ff args into an immediate structure and pass a
> reference to that.
Wouldn't that pass the arguments on the stack, or am I understanding you
wrong? I think not using the stack if it can be avoided is the whole
point of INLINE_SYSCALL/INTERNAL_SYSCALL...

> 
> What does glibc do?
As far as I can tell, glibc's INTERNAL_SYSCALL implementation for i386
only supports up to 5 arguments, all syscall6 are implemented indepently
on i386 (in the case of epoll_pwait there is an indepdendent assembly
implementation as the 6th argument is implicit from the applications'
point of view; splice and maybe others are automatically generated
assembly as the kernel and libc APIs match)

Matthias

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