From: David Laight <david.laight.linux@gmail.com>
To: "Arnd Bergmann" <arnd@arndb.de>
Cc: "Ian Rogers" <irogers@google.com>,
"Arnaldo Carvalho de Melo" <acme@kernel.org>,
"Howard Chu" <howardchu95@gmail.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Ingo Molnar" <mingo@redhat.com>,
"Namhyung Kim" <namhyung@kernel.org>,
"Mark Rutland" <mark.rutland@arm.com>,
"Alexander Shishkin" <alexander.shishkin@linux.intel.com>,
"Jiri Olsa" <jolsa@kernel.org>,
"Adrian Hunter" <adrian.hunter@intel.com>,
"Kan Liang" <kan.liang@linux.intel.com>,
"John Garry" <john.g.garry@oracle.com>,
"Will Deacon" <will@kernel.org>,
"James Clark" <james.clark@linaro.org>,
"Mike Leach" <mike.leach@linaro.org>,
"Leo Yan" <leo.yan@linux.dev>, guoren <guoren@kernel.org>,
"Paul Walmsley" <paul.walmsley@sifive.com>,
"Palmer Dabbelt" <palmer@dabbelt.com>,
"Albert Ou" <aou@eecs.berkeley.edu>,
"Charlie Jenkins" <charlie@rivosinc.com>,
"Bibo Mao" <maobibo@loongson.cn>,
"Huacai Chen" <chenhuacai@kernel.org>,
"Catalin Marinas" <catalin.marinas@arm.com>,
"Jiri Slaby" <jirislaby@kernel.org>,
"Björn Töpel" <bjorn@rivosinc.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
"linux-csky@vger.kernel.org" <linux-csky@vger.kernel.org>,
linux-riscv@lists.infradead.org
Subject: Re: [PATCH v2 5/7] perf trace beauty: Add syscalltbl.sh generating all system call tables
Date: Wed, 12 Feb 2025 13:59:19 +0000 [thread overview]
Message-ID: <20250212135919.4e7a26fd@pumpkin> (raw)
In-Reply-To: <0195f9a0-5198-4ee0-b4ff-ea7126dc8299@app.fastmail.com>
On Tue, 11 Feb 2025 18:53:14 +0100
"Arnd Bergmann" <arnd@arndb.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
WARNING: multiple messages have this Message-ID (diff)
From: David Laight <david.laight.linux@gmail.com>
To: "Arnd Bergmann" <arnd@arndb.de>
Cc: "Ian Rogers" <irogers@google.com>,
"Arnaldo Carvalho de Melo" <acme@kernel.org>,
"Howard Chu" <howardchu95@gmail.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Ingo Molnar" <mingo@redhat.com>,
"Namhyung Kim" <namhyung@kernel.org>,
"Mark Rutland" <mark.rutland@arm.com>,
"Alexander Shishkin" <alexander.shishkin@linux.intel.com>,
"Jiri Olsa" <jolsa@kernel.org>,
"Adrian Hunter" <adrian.hunter@intel.com>,
"Kan Liang" <kan.liang@linux.intel.com>,
"John Garry" <john.g.garry@oracle.com>,
"Will Deacon" <will@kernel.org>,
"James Clark" <james.clark@linaro.org>,
"Mike Leach" <mike.leach@linaro.org>,
"Leo Yan" <leo.yan@linux.dev>, guoren <guoren@kernel.org>,
"Paul Walmsley" <paul.walmsley@sifive.com>,
"Palmer Dabbelt" <palmer@dabbelt.com>,
"Albert Ou" <aou@eecs.berkeley.edu>,
"Charlie Jenkins" <charlie@rivosinc.com>,
"Bibo Mao" <maobibo@loongson.cn>,
"Huacai Chen" <chenhuacai@kernel.org>,
"Catalin Marinas" <catalin.marinas@arm.com>,
"Jiri Slaby" <jirislaby@kernel.org>,
"Björn Töpel" <bjorn@rivosinc.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
"linux-csky@vger.kernel.org" <linux-csky@vger.kernel.org>,
linux-riscv@lists.infradead.org
Subject: Re: [PATCH v2 5/7] perf trace beauty: Add syscalltbl.sh generating all system call tables
Date: Wed, 12 Feb 2025 13:59:19 +0000 [thread overview]
Message-ID: <20250212135919.4e7a26fd@pumpkin> (raw)
In-Reply-To: <0195f9a0-5198-4ee0-b4ff-ea7126dc8299@app.fastmail.com>
On Tue, 11 Feb 2025 18:53:14 +0100
"Arnd Bergmann" <arnd@arndb.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
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next prev parent reply other threads:[~2025-02-12 14:01 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-10 16:51 [PATCH v2 0/7] perf: Support multiple system call tables in the build Ian Rogers
2025-02-10 16:51 ` Ian Rogers
2025-02-10 16:51 ` [PATCH v2 1/7] perf syscalltble: Remove syscall_table.h Ian Rogers
2025-02-10 16:51 ` Ian Rogers
2025-02-10 23:48 ` Charlie Jenkins
2025-02-10 23:48 ` Charlie Jenkins
2025-02-10 16:51 ` [PATCH v2 2/7] perf trace: Reorganize syscalls Ian Rogers
2025-02-10 16:51 ` Ian Rogers
2025-02-11 0:17 ` Charlie Jenkins
2025-02-11 0:17 ` Charlie Jenkins
2025-02-10 16:51 ` [PATCH v2 3/7] perf syscalltbl: Remove struct syscalltbl Ian Rogers
2025-02-10 16:51 ` Ian Rogers
2025-02-11 0:19 ` Charlie Jenkins
2025-02-11 0:19 ` Charlie Jenkins
2025-02-11 7:48 ` Arnd Bergmann
2025-02-11 7:48 ` Arnd Bergmann
2025-02-11 16:18 ` Ian Rogers
2025-02-11 16:18 ` Ian Rogers
2025-02-11 16:34 ` Arnd Bergmann
2025-02-11 16:34 ` Arnd Bergmann
2025-02-11 17:32 ` Ian Rogers
2025-02-11 17:32 ` Ian Rogers
2025-02-10 16:51 ` [PATCH v2 4/7] perf thread: Add support for reading the e_machine type for a thread Ian Rogers
2025-02-10 16:51 ` Ian Rogers
2025-02-11 0:20 ` Charlie Jenkins
2025-02-11 0:20 ` Charlie Jenkins
2025-02-10 16:51 ` [PATCH v2 5/7] perf trace beauty: Add syscalltbl.sh generating all system call tables Ian Rogers
2025-02-10 16:51 ` Ian Rogers
2025-02-11 0:22 ` Charlie Jenkins
2025-02-11 0:22 ` Charlie Jenkins
2025-02-11 5:08 ` Ian Rogers
2025-02-11 5:08 ` Ian Rogers
2025-02-11 8:08 ` Arnd Bergmann
2025-02-11 8:08 ` Arnd Bergmann
2025-02-11 17:24 ` Ian Rogers
2025-02-11 17:24 ` Ian Rogers
2025-02-11 17:53 ` Arnd Bergmann
2025-02-11 17:53 ` Arnd Bergmann
2025-02-11 18:45 ` Ian Rogers
2025-02-11 18:45 ` Ian Rogers
2025-02-12 13:59 ` David Laight [this message]
2025-02-12 13:59 ` David Laight
2025-02-10 16:51 ` [PATCH v2 6/7] perf syscalltbl: Use lookup table containing multiple architectures Ian Rogers
2025-02-10 16:51 ` Ian Rogers
2025-02-10 23:39 ` Charlie Jenkins
2025-02-10 23:39 ` Charlie Jenkins
2025-02-11 5:15 ` Ian Rogers
2025-02-11 5:15 ` Ian Rogers
2025-02-11 0:23 ` Charlie Jenkins
2025-02-11 0:23 ` Charlie Jenkins
2025-02-10 16:51 ` [PATCH v2 7/7] perf build: Remove Makefile.syscalls Ian Rogers
2025-02-10 16:51 ` Ian Rogers
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