linux-kernel - Various x86 syscall mechanisms

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Date:	Fri, 20 Jun 2008 15:00:21 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Roland McGrath <roland@...hat.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Various x86 syscall mechanisms

Hi Roland,

As far as I can work out, an x86_32 kernel will use "int 0x80" and 
"sysenter" for system calls.  64-bit kernel will use just "syscall" for 
64-bit processes (though you can use "int 0x80" to access the 32-bit 
syscall interface from a 64-bit process), but will allow "sysenter", 
"syscall" or "int 0x80" for 32-on-64 processes.

Why does 32-on-64 implement 32-bit syscall when native 32-bit doesn't 
seem to?  Or am I overlooking something here?  Does 32-bit also support 
syscall?

Thanks,
    J
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