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([2001:df0:0:200c:ec2f:8388:f010:f71a]) by smtp.gmail.com with ESMTPSA id w18sm12085174pgj.31.2020.07.26.14.02.09 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 26 Jul 2020 14:02:16 -0700 (PDT) Subject: Re: Seccomp support for linux-m68k To: Andreas Schwab Cc: John Paul Adrian Glaubitz , linux-m68k , Debian m68k , Helge Deller References: <5642df4a-be8f-01eb-63c1-b5b4d75fa9d0@physik.fu-berlin.de> <06f3ccd0-3567-5905-eea0-80fb18206648@gmail.com> <877durreph.fsf@igel.home> <80cef911-af86-c49f-5ac3-1cfe7037de80@gmail.com> <87wo2q5yhx.fsf@igel.home> From: Michael Schmitz Message-ID: <460261ab-8c10-d625-a4e4-a4e755413018@gmail.com> Date: Mon, 27 Jul 2020 09:02:03 +1200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <87wo2q5yhx.fsf@igel.home> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Sender: linux-m68k-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-m68k@vger.kernel.org Hi Andreas, On 26/07/20 11:03 PM, Andreas Schwab wrote: > On Jul 26 2020, Michael Schmitz wrote: > >> No particular reason - I had seen testb used in the syscall entry code and > Where? That may be bugs. Here: ENTRY(ret_from_signal)         movel   %curptr@(TASK_STACK),%a1         tstb    %a1@(TINFO_FLAGS+2)         jge     1f         jbsr    syscall_trace_leave 1:      RESTORE_SWITCH_STACK         addql   #4,%sp .... and here: ENTRY(system_call)         SAVE_ALL_SYS         GET_CURRENT(%d1)         movel   %d1,%a1         | save top of frame         movel   %sp,%curptr@(TASK_THREAD+THREAD_ESP0)         | syscall trace?         tstb    %a1@(TINFO_FLAGS+2)         jmi     do_trace_entry         cmpl    #NR_syscalls,%d0         jcc     badsys .... plus when saving the FPU context on resume (the comment there suggests FPUs keep 8 bits of status that must be tested, so that should be OK). Cheers,     Michael > > Andreas. >