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Date: Thu, 23 Sep 2021 12:25:07 +0200 From: Arnd Bergmann <arnd@...db.de> To: rpalethorpe@...e.de Cc: Arnd Bergmann <arnd@...db.de>, Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>, Linux API <linux-api@...r.kernel.org>, linux-aio <linux-aio@...ck.org>, y2038 Mailman List <y2038@...ts.linaro.org>, Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, "the arch/x86 maintainers" <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, Deepa Dinamani <deepa.kernel@...il.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, LTP List <ltp@...ts.linux.it> Subject: Re: ia32 signed long treated as x64 unsigned int by __ia32_sys* On Thu, Sep 23, 2021 at 12:01 PM Richard Palethorpe <rpalethorpe@...e.de> wrote: > Arnd Bergmann <arnd@...db.de> writes: > > On Wed, Sep 22, 2021 at 10:46 AM Richard Palethorpe <rpalethorpe@...e.de> wrote: > >> Richard Palethorpe <rpalethorpe@...e.de> writes: > > > > I also noticed that only x86 and s390 even have separate entry > > points for normal syscalls when called in compat mode, while > > the others all just zero the upper halves of the registers in the > > low-level entry code and then call the native entry point. > > It looks to me like aarch64 also has something similar? At any rate, I > can try to fix it for x86 and investigate what else might be effected. arm64 also has a custom asm/syscall_wrapper.h, but it only does this for accessing pt_regs (as x86 does), not for doing any argument conversion. x86 does the 32-to-64 widening in the wrapper, arm64 relies on the pt_regs already having the upper halves zeroed. Arnd
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