Re: [PATCH v6 12/20] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it

[Dr. Philipp Tomsich]

> On 18 Dec 2015, at 13:47, Arnd Bergmann <arnd@xxxxxxxx> wrote:
> 
>> 3. Follow the PCS up to glibc but always pass syscall arguments in W
>>   registers, like AArch32 compat support (the least preferred option,
>>   the only advantage is a single wrapper for all syscalls but it would
>>   be doing unnecessary zeroing even for syscalls where it isn't needed)
> 
> This would mean we cannot pass 64-bit arguments in registers, right?

Note that thereâs no 32bit registers (the âwâ-form always refers to the lower
32bits of a 64bit register, with implicit zero-extension)â and load/store
instructions always use the full base-register (âxâ-form) for address calculation.
I.e. a load/store would inadvertently pickup ârandom garbageâ in the upper 
32bits, if no explicit zero-extension is applied.

In other words: all zero-extensions for 32bit arguments should be explicit
on the kernel side.

Regards,
Philipp.

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