amd64, COMPAT_IA32 & syscall diverts

[Julian Elischer]

Andrew N. Below wrote:
>> Andrew N. Below wrote:
>>> Hi all.
>>>
>>> We have loadable kernel module with
>>> several syscall intercepting functions
>>> (e.g., sysent[SYS___sysctl].sy_call).
>>> Earlier, this module was built and used
>>> on i386 platform, now we have to run it
>>> on amd64. For some reasons we have to
>>> enable COMPAT_IA32 option in kernel.
>>>
>>> Our syscall wrapper sucessfully receiving
>>> syscalls from amd64 binaries, but we have
>>> nothing from old i386 binaries.
>>>
>>> Seems like these calls are made bypassing
>>> our kernel module.
>> x86 binaries use a separate syscall table, so you need to patch
>> both tables.
> 
> Where can I find something about that table?

the compat stuff is in /sys/compat/ia32/
So I would start there and follow the logic.

> 
> Nothing interesting in sysent.h/syscall.h...
> 
> --
> Andrew
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