linux-kernel - Re: [PATCH v2 5/7] perf trace beauty: Add syscalltbl.sh generating all system call tables

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Message-ID: <20250212135919.4e7a26fd@pumpkin>
Date: Wed, 12 Feb 2025 13:59:19 +0000
From: David Laight <david.laight.linux@...il.com>
To: "Arnd Bergmann" <arnd@...db.de>
Cc: "Ian Rogers" <irogers@...gle.com>, "Arnaldo Carvalho de Melo"
 <acme@...nel.org>, "Howard Chu" <howardchu95@...il.com>, "Peter Zijlstra"
 <peterz@...radead.org>, "Ingo Molnar" <mingo@...hat.com>, "Namhyung Kim"
 <namhyung@...nel.org>, "Mark Rutland" <mark.rutland@....com>, "Alexander
 Shishkin" <alexander.shishkin@...ux.intel.com>, "Jiri Olsa"
 <jolsa@...nel.org>, "Adrian Hunter" <adrian.hunter@...el.com>, "Kan Liang"
 <kan.liang@...ux.intel.com>, "John Garry" <john.g.garry@...cle.com>, "Will
 Deacon" <will@...nel.org>, "James Clark" <james.clark@...aro.org>, "Mike
 Leach" <mike.leach@...aro.org>, "Leo Yan" <leo.yan@...ux.dev>, guoren
 <guoren@...nel.org>, "Paul Walmsley" <paul.walmsley@...ive.com>, "Palmer
 Dabbelt" <palmer@...belt.com>, "Albert Ou" <aou@...s.berkeley.edu>,
 "Charlie Jenkins" <charlie@...osinc.com>, "Bibo Mao" <maobibo@...ngson.cn>,
 "Huacai Chen" <chenhuacai@...nel.org>, "Catalin Marinas"
 <catalin.marinas@....com>, "Jiri Slaby" <jirislaby@...nel.org>,
 Björn Töpel <bjorn@...osinc.com>,
 linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, "linux-csky@...r.kernel.org"
 <linux-csky@...r.kernel.org>, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 5/7] perf trace beauty: Add syscalltbl.sh generating
 all system call tables

On Tue, 11 Feb 2025 18:53:14 +0100
"Arnd Bergmann" <arnd@...db.de> wrote:

...
> I think the way it actually works on mips is that all syscalls are
> allowed in any task and the actual number identifies both the
> ABI and the syscall. In some variant, the same is true on arm
> (oabi/eabi) and x86-64 (64/x32), but oabi and x32 are both too
> obsolete to put much work into them.

IIRC x86-64 processes can also just make i386 system calls.
Even switching to/from 64bit mode isn't privileged.

	David