linux-kernel - Re: [PATCH v2 3/7] syscall.h: add syscall_set_arguments() and syscall_set_return

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Message-ID: <B5D44A2A-BF4F-4EEA-992D-0A06F2AE08CA@zytor.com>
Date: Fri, 17 Jan 2025 20:34:45 -0800
From: "H. Peter Anvin" <hpa@...or.com>
To: Eugene Syromyatnikov <evgsyr@...il.com>
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Subject: Re: [PATCH v2 3/7] syscall.h: add syscall_set_arguments() and syscall_set_return_value()

On January 17, 2025 7:45:02 AM PST, Eugene Syromyatnikov <evgsyr@...il.com> wrote:
>On Fri, Jan 17, 2025 at 2:03 AM H. Peter Anvin <hpa@...or.com> wrote:
>>
>> I link the concept of this patchset, but *please* make it clear in the
>> comments that this does not solve the issue of 64-bit kernel arguments
>> on 32-bit systems being ABI specific.
>
>Sorry, but I don't see how this is relevant; each architecture has its
>own ABI with its own set of peculiarities, and there's a lot of
>(completely unrelated) work needed in order to make an ABI that is
>architecture-agnostic.  All this patch set does is provides a
>consistent way to manipulate scno and args across architectures;  it
>doesn't address the fact that some architectures have mmap2/mmap_pgoff
>syscall, or that some have fadvise64_64 in addition to fadvise64, or
>the existence of clone2, or socketcall, or ipc; or that some
>architectures don't have open or stat;  or that scnos on different
>architectures or even different bit-widths within the "same"
>architecture are different.
>
>> This isn't unique to this patch in any way; the only way to handle it is
>> by keeping track of each ABI.
>
>That's true, but this patch doesn't even try to address that.
>

I just want it noted in the comment, that's all.