From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 96CF9C433E0 for ; Tue, 22 Dec 2020 12:34:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5E54E23133 for ; Tue, 22 Dec 2020 12:34:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726867AbgLVMeB (ORCPT ); Tue, 22 Dec 2020 07:34:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50100 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726526AbgLVMeA (ORCPT ); Tue, 22 Dec 2020 07:34:00 -0500 Received: from mail-wr1-x433.google.com (mail-wr1-x433.google.com [IPv6:2a00:1450:4864:20::433]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F3DA0C06179C for ; Tue, 22 Dec 2020 04:33:19 -0800 (PST) Received: by mail-wr1-x433.google.com with SMTP id i9so14380771wrc.4 for ; Tue, 22 Dec 2020 04:33:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=Pw3ScKFNOmHQNopK+wVhPZ7sGGOnuzibGp3JbI1veWk=; b=Ud8DEzvunHDBwUNDlVnp1aqRVuh1Clr7JSM9caBQt6a7tykb/z2gEYruFeg7kkI2ZP UMhVbMsLAHilC1QWk12wRMSOfSCPSXx9a/zBmAViFy2+oipkLbDoG72XXvYfNIu7u+io 0xAE7tbLbNcBMOLIHagHW5itOjlVSzXzHENxYwU1KZsIQLQDxQIYmHh19lqbwn00zlXO DzUNgAs9l1QCf4TK05fOnTUeEoIQBlA0kVp1IYP8kI0YSAbNlVQCcpW14/KLboyLchYF 1JtHSMF0rnafAL9T0E93v16lDKdYh/I2WUJGtaeUgarFsh7yOCExFt5ooBeN0dUMJN30 ttRg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=Pw3ScKFNOmHQNopK+wVhPZ7sGGOnuzibGp3JbI1veWk=; b=WwZYNi7IdQHexVNrOgaYbA4EzZFPpCrjVMh89slgl+JSCDIAMpKXSuLgn7tq+WHnRL iROMUTAS2xVGG0ZeULz169rjOZu8g9K81inkr62Vq0btow7ZEIJeFaovX8O1ijv/JlYa Wkb9RGpa8rSRNyOaac4zT3qJ/EXgsWpumMX3V8BgLoaWiNUrTrSfpIhMkjj2StZWVn4D DrL0CJrvCeIXimcjDWg1tJG4XkXlXB2vCaNuTC/aDeTkqt61qX7FHy8ppymuwLnzGygQ LGCZUH5/1l0W+O6KH2j7u+KZporiBmr9RzEAoSTazkbOvtSC0mHwfyWTGKAAH7Gn4zQh eq3g== X-Gm-Message-State: AOAM53077qVDwfUrXutVB3Qpd34SmRfNYOq5AK8kWEw+mRTEQ4tr6yUP 7xWZS/R+41kQ17ArENCM1+rdyNxiwCQ= X-Google-Smtp-Source: ABdhPJyUhFYTRAwsIAlnEpJFKGYs59ioTj1qoFUH/jY/lg9/KMT5SLJH4Ke/9D+oSjc/RWDe+xqJeA== X-Received: by 2002:adf:efc5:: with SMTP id i5mr23415855wrp.377.1608640398750; Tue, 22 Dec 2020 04:33:18 -0800 (PST) Received: from [192.168.1.143] ([170.253.51.130]) by smtp.gmail.com with ESMTPSA id a17sm31784312wrs.20.2020.12.22.04.33.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 22 Dec 2020 04:33:18 -0800 (PST) Subject: Re: [patch] syscall.2: Update superh syscall convention To: =?UTF-8?Q?Peter_Fr=c3=b6hlich?= , Rich Felker Cc: mtk.manpages@gmail.com, linux-man@vger.kernel.org References: From: "Alejandro Colomar (man-pages)" Message-ID: Date: Tue, 22 Dec 2020 13:33:17 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.5.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org Hi Peter, I found Rich's email on the lkml archives. Thanks, Alex On 12/22/20 1:28 PM, Peter Fröhlich wrote: > I noticed this while working on some silly "hello, world" programs, > see https://git.sr.ht/~phf/hello-again if you're curious. > Disassembling sh4 code showed trap #31 all over the place but the > syscall(2) man page talked about trap #0x17 and friends. Checking the > kernel sources I got lucky in arch/sh/kernel/entry-common.S where in > commit 3623d138213ae Rich Felker clarifies the situation. (I would > have cc'ed Rich but I cannot find his email.) I've attached the patch > since I am less than convinced that gmail will properly preserve it > inline. > > --- > man2/syscall.2 | 14 ++++---------- > 1 file changed, 4 insertions(+), 10 deletions(-) > > diff --git a/man2/syscall.2 b/man2/syscall.2 > index 986db9d11..87de539dd 100644 > --- a/man2/syscall.2 > +++ b/man2/syscall.2 > @@ -216,7 +216,7 @@ powerpc64 sc r0 r3 - cr0.SO 1 > riscv ecall a7 a0 a1 - > s390 svc 0 r1 r2 r3 - 3 > s390x svc 0 r1 r2 r3 - 3 > -superh trap #0x17 r3 r0 r1 - 4, 6 > +superh trapa #31 r3 r0 r1 - 4, 6 > sparc/32 t 0x10 g1 o0 o1 psr/csr 1, 6 > sparc/64 t 0x6d g1 o0 o1 psr/csr 1, 6 > tile swint1 R10 R00 - R01 1 > @@ -252,15 +252,9 @@ For s390 and s390x, > .I "svc\ NR" > if it is less than 256. > .IP [4] > -On SuperH, the trap number controls the maximum number of arguments passed. > -A > -.IR "trap\ #0x10" > -can be used with only 0-argument system calls, a > -.IR "trap\ #0x11" > -can be used with 0- or 1-argument system calls, > -and so on up to > -.IR "trap #0x17" > -for 7-argument system calls. > +On SuperH additional trap numbers are supported for historic reasons, but > +.BR trapa #31 > +is the recommended "unified" ABI. > .IP [5] > The x32 ABI shares syscall table with x86-64 ABI, but there are some > nuances: > -- Alejandro Colomar Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/ http://www.alejandro-colomar.es/