>>>>> "Philip" == Philip Blundell <[EMAIL PROTECTED]> writes:
>> Its probably not the best way of going about things but I'm
>> participating in a C implimentation of a micro-kernel who's
>> syscalls in general have more then 4 arguments and return more
>> then one. Its important to avoid copying. The ABI defines which
>> registers are what and that all registers less the user SP are
>> undefined after the syscall except where they are allocated for
>> results from the syscall.
Philip> I don't quite understand what you're trying to do. Are you
Philip> saying you want to arrange for certain functions to have a
Philip> non-standard calling sequence where all regs are clobbered
Philip> and a greater than usual number are used for args and return
Philip> values?
Philip> If so, this isn't possible without some hacking of the
Philip> compiler.
Couldn't you do it with the extended form of the asm statement that
GCC supports? That gives a whole lot of control over how parameters
are passed in and out of the asm block. If the asm block in turn is a
function call (or syscall) instruction, that may do the job.
paul
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