[{"id":3678570,"web_url":"http://patchwork.ozlabs.org/comment/3678570/","msgid":"","list_archive_url":null,"date":"2026-04-17T08:40:53","subject":"Re: [PATCH] linux-user/ppc: Fix ppc64 rt_sigframe stack offset","submitter":{"id":5111,"url":"http://patchwork.ozlabs.org/api/people/5111/","name":"Peter Maydell","email":"peter.maydell@linaro.org"},"content":"On Thu, 16 Apr 2026 at 19:25, Matt Turner wrote:\n>\n> The kernel's 64-bit signal delivery (signal_64.c) uses:\n>\n> newsp = frame - __SIGNAL_FRAMESIZE\n>\n> while the 32-bit path (signal_32.c) uses:\n>\n> newsp = frame - (__SIGNAL_FRAMESIZE + 16)\n>\n> The extra 16 bytes in the 32-bit case is to place siginfo and ucontext\n> at the same offsets as older kernels (see the comment in signal_32.c).\n> The 64-bit rt_sigframe starts with ucontext directly and does not need\n> this adjustment.\n>\n> QEMU's setup_rt_frame() unconditionally used (SIGNAL_FRAMESIZE + 16)\n> for both 32-bit and 64-bit, placing the handler's SP 16 bytes too low\n> on ppc64. Signal delivery and return still worked because do_rt_sigreturn\n> had the matching wrong offset, but the vDSO DWARF unwind info encodes\n> the correct kernel offset. This caused any DWARF unwinder (libunwind,\n> libgcc, etc.) to compute a CFA that is 16 bytes off, reading garbage\n> register values from the signal frame.\n>\n> Define RT_SIGFRAME_ADJUST (0 on ppc64, 16 on ppc32) and use it in both\n> setup_rt_frame and do_rt_sigreturn to match the kernel.\n>\n> This was verified by A/B testing with libunwind's test suite:\n>\n> ppc64le: Gtest-bt, Ltest-bt, Gtest-concurrent, Ltest-concurrent,\n> and Ltest-sig-context all change from FAIL to PASS.\n> ppc64be: Gtest-bt, Ltest-bt, and Ltest-sig-context all change\n> from FAIL to PASS.\n>\n> Signed-off-by: Matt Turner \n> ---\n> linux-user/ppc/signal.c | 16 ++++++++++++++--\n> 1 file changed, 14 insertions(+), 2 deletions(-)\n>\n\nReviewed-by: Peter Maydell \n\nthanks\n-- PMM","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=XZyLH+vw;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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Fri, 17 Apr 2026\n 01:41:06 -0700 (PDT)","MIME-Version":"1.0","References":"<20260414025335.2847358-1-mattst88@gmail.com>\n <20260416182527.3862296-1-mattst88@gmail.com>","In-Reply-To":"<20260416182527.3862296-1-mattst88@gmail.com>","From":"Peter Maydell ","Date":"Fri, 17 Apr 2026 09:40:53 +0100","X-Gm-Features":"AQROBzA6Abv6TuljFT-qeltiUNMIurVNZb8m9EFNc6LLF5ulZj-YZsVNpNA0okY","Message-ID":"\n ","Subject":"Re: [PATCH] linux-user/ppc: Fix ppc64 rt_sigframe stack offset","To":"Matt Turner ","Cc":"Laurent Vivier , qemu-devel@nongnu.org","Content-Type":"text/plain; charset=\"UTF-8\"","Received-SPF":"pass client-ip=2607:f8b0:4864:20::b12a;\n envelope-from=peter.maydell@linaro.org; helo=mail-yx1-xb12a.google.com","X-Spam_score_int":"-20","X-Spam_score":"-2.1","X-Spam_bar":"--","X-Spam_report":"(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3679609,"web_url":"http://patchwork.ozlabs.org/comment/3679609/","msgid":"","list_archive_url":null,"date":"2026-04-20T20:59:05","subject":"Re: [PATCH] linux-user/ppc: Fix ppc64 rt_sigframe stack offset","submitter":{"id":7917,"url":"http://patchwork.ozlabs.org/api/people/7917/","name":"Matt Turner","email":"mattst88@gmail.com"},"content":"On Fri, Apr 17, 2026 at 4:41 AM Peter Maydell wrote:\n>\n> On Thu, 16 Apr 2026 at 19:25, Matt Turner wrote:\n> >\n> > The kernel's 64-bit signal delivery (signal_64.c) uses:\n> >\n> > newsp = frame - __SIGNAL_FRAMESIZE\n> >\n> > while the 32-bit path (signal_32.c) uses:\n> >\n> > newsp = frame - (__SIGNAL_FRAMESIZE + 16)\n> >\n> > The extra 16 bytes in the 32-bit case is to place siginfo and ucontext\n> > at the same offsets as older kernels (see the comment in signal_32.c).\n> > The 64-bit rt_sigframe starts with ucontext directly and does not need\n> > this adjustment.\n> >\n> > QEMU's setup_rt_frame() unconditionally used (SIGNAL_FRAMESIZE + 16)\n> > for both 32-bit and 64-bit, placing the handler's SP 16 bytes too low\n> > on ppc64. Signal delivery and return still worked because do_rt_sigreturn\n> > had the matching wrong offset, but the vDSO DWARF unwind info encodes\n> > the correct kernel offset. This caused any DWARF unwinder (libunwind,\n> > libgcc, etc.) to compute a CFA that is 16 bytes off, reading garbage\n> > register values from the signal frame.\n> >\n> > Define RT_SIGFRAME_ADJUST (0 on ppc64, 16 on ppc32) and use it in both\n> > setup_rt_frame and do_rt_sigreturn to match the kernel.\n> >\n> > This was verified by A/B testing with libunwind's test suite:\n> >\n> > ppc64le: Gtest-bt, Ltest-bt, Gtest-concurrent, Ltest-concurrent,\n> > and Ltest-sig-context all change from FAIL to PASS.\n> > ppc64be: Gtest-bt, Ltest-bt, and Ltest-sig-context all change\n> > from FAIL to PASS.\n> >\n> > Signed-off-by: Matt Turner \n> > ---\n> > linux-user/ppc/signal.c | 16 ++++++++++++++--\n> > 1 file changed, 14 insertions(+), 2 deletions(-)\n> >\n>\n> Reviewed-by: Peter Maydell \n\nThanks!\n\nI sent this to Laurent Vivier since that's what\n`get_maintainer.pl` said, but I see that he hasn't committed this\nyear. Should I wait on him, or can you see that this gets in?\n\nAlso, I think this is probably worth including in the stable\nbranch(es), so I've cc'd qemu-devel@nongnu.org.\n\nMatt","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=IVhq5Pjm;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fzzJv5LMCz1yD8\n\tfor ; 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Mon, 20 Apr 2026\n 13:59:17 -0700 (PDT)","MIME-Version":"1.0","References":"<20260414025335.2847358-1-mattst88@gmail.com>\n <20260416182527.3862296-1-mattst88@gmail.com>\n ","In-Reply-To":"\n ","From":"Matt Turner ","Date":"Mon, 20 Apr 2026 16:59:05 -0400","X-Gm-Features":"AQROBzBVIf8SA6i1AvpMp7XG2ZMs3s6VZM9X7hWcZddjleV-u9Hvj_EKWKAIKiI","Message-ID":"\n ","Subject":"Re: [PATCH] linux-user/ppc: Fix ppc64 rt_sigframe stack offset","To":"Peter Maydell ","Cc":"Laurent Vivier , qemu-devel@nongnu.org,\n qemu-stable@nongnu.org","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable","Received-SPF":"pass client-ip=2a00:1450:4864:20::136;\n envelope-from=mattst88@gmail.com; helo=mail-lf1-x136.google.com","X-Spam_score_int":"-17","X-Spam_score":"-1.8","X-Spam_bar":"-","X-Spam_report":"(-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-Mailman-Approved-At":"Mon, 20 Apr 2026 17:33:23 -0400","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3681412,"web_url":"http://patchwork.ozlabs.org/comment/3681412/","msgid":"","list_archive_url":null,"date":"2026-04-23T12:02:26","subject":"Re: [PATCH] linux-user/ppc: Fix ppc64 rt_sigframe stack offset","submitter":{"id":7917,"url":"http://patchwork.ozlabs.org/api/people/7917/","name":"Matt Turner","email":"mattst88@gmail.com"},"content":"On Mon, Apr 20, 2026 at 4:59 PM Matt Turner wrote:\n>\n> On Fri, Apr 17, 2026 at 4:41 AM Peter Maydell wrote:\n> >\n> > On Thu, 16 Apr 2026 at 19:25, Matt Turner wrote:\n> > >\n> > > The kernel's 64-bit signal delivery (signal_64.c) uses:\n> > >\n> > > newsp = frame - __SIGNAL_FRAMESIZE\n> > >\n> > > while the 32-bit path (signal_32.c) uses:\n> > >\n> > > newsp = frame - (__SIGNAL_FRAMESIZE + 16)\n> > >\n> > > The extra 16 bytes in the 32-bit case is to place siginfo and ucontext\n> > > at the same offsets as older kernels (see the comment in signal_32.c).\n> > > The 64-bit rt_sigframe starts with ucontext directly and does not need\n> > > this adjustment.\n> > >\n> > > QEMU's setup_rt_frame() unconditionally used (SIGNAL_FRAMESIZE + 16)\n> > > for both 32-bit and 64-bit, placing the handler's SP 16 bytes too low\n> > > on ppc64. Signal delivery and return still worked because do_rt_sigreturn\n> > > had the matching wrong offset, but the vDSO DWARF unwind info encodes\n> > > the correct kernel offset. This caused any DWARF unwinder (libunwind,\n> > > libgcc, etc.) to compute a CFA that is 16 bytes off, reading garbage\n> > > register values from the signal frame.\n> > >\n> > > Define RT_SIGFRAME_ADJUST (0 on ppc64, 16 on ppc32) and use it in both\n> > > setup_rt_frame and do_rt_sigreturn to match the kernel.\n> > >\n> > > This was verified by A/B testing with libunwind's test suite:\n> > >\n> > > ppc64le: Gtest-bt, Ltest-bt, Gtest-concurrent, Ltest-concurrent,\n> > > and Ltest-sig-context all change from FAIL to PASS.\n> > > ppc64be: Gtest-bt, Ltest-bt, and Ltest-sig-context all change\n> > > from FAIL to PASS.\n> > >\n> > > Signed-off-by: Matt Turner \n> > > ---\n> > > linux-user/ppc/signal.c | 16 ++++++++++++++--\n> > > 1 file changed, 14 insertions(+), 2 deletions(-)\n> > >\n> >\n> > Reviewed-by: Peter Maydell \n>\n> Thanks!\n>\n> I sent this to Laurent Vivier since that's what\n> `get_maintainer.pl` said, but I see that he hasn't committed this\n> year. Should I wait on him, or can you see that this gets in?\n>\n> Also, I think this is probably worth including in the stable\n> branch(es), so I've cc'd qemu-devel@nongnu.org.\n>\n> Matt\n\nSorry to ping. Just trying to get clarity on what I need to do.","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=OPOYcdju;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g1ZWT6R6Zz1yD5\n\tfor ; Thu, 23 Apr 2026 22:04:04 +1000 (AEST)","from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from )\n\tid 1wFslr-0007WG-9l; 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Thu, 23 Apr 2026\n 05:02:38 -0700 (PDT)","MIME-Version":"1.0","References":"<20260414025335.2847358-1-mattst88@gmail.com>\n <20260416182527.3862296-1-mattst88@gmail.com>\n \n ","In-Reply-To":"\n ","From":"Matt Turner ","Date":"Thu, 23 Apr 2026 08:02:26 -0400","X-Gm-Features":"AQROBzDFYIowAhaT48rXdZkVGQXwPXnk1kd9tynqs1bWaKNMxXR4VGdWsQnQkKI","Message-ID":"\n ","Subject":"Re: [PATCH] linux-user/ppc: Fix ppc64 rt_sigframe stack offset","To":"Peter Maydell ","Cc":"Laurent Vivier , qemu-devel@nongnu.org,\n qemu-stable@nongnu.org,\n Pierrick Bouvier ","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable","Received-SPF":"pass client-ip=2a00:1450:4864:20::134;\n envelope-from=mattst88@gmail.com; helo=mail-lf1-x134.google.com","X-Spam_score_int":"-17","X-Spam_score":"-1.8","X-Spam_bar":"-","X-Spam_report":"(-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3681512,"web_url":"http://patchwork.ozlabs.org/comment/3681512/","msgid":"<3fe78350-3ca3-4bef-a1b1-ad5523295145@gmx.de>","list_archive_url":null,"date":"2026-04-23T14:54:37","subject":"Re: [PATCH] linux-user/ppc: Fix ppc64 rt_sigframe stack offset","submitter":{"id":1115,"url":"http://patchwork.ozlabs.org/api/people/1115/","name":"Helge Deller","email":"deller@gmx.de"},"content":"Hi Matt,\n\nOn 4/23/26 14:02, Matt Turner wrote:\n> On Mon, Apr 20, 2026 at 4:59 PM Matt Turner wrote:\n>>\n>> On Fri, Apr 17, 2026 at 4:41 AM Peter Maydell wrote:\n>>>\n>>> On Thu, 16 Apr 2026 at 19:25, Matt Turner wrote:\n>>>>\n>>>> The kernel's 64-bit signal delivery (signal_64.c) uses:\n>>>>\n>>>> newsp = frame - __SIGNAL_FRAMESIZE\n>>>>\n>>>> while the 32-bit path (signal_32.c) uses:\n>>>>\n>>>> newsp = frame - (__SIGNAL_FRAMESIZE + 16)\n>>>>\n>>>> The extra 16 bytes in the 32-bit case is to place siginfo and ucontext\n>>>> at the same offsets as older kernels (see the comment in signal_32.c).\n>>>> The 64-bit rt_sigframe starts with ucontext directly and does not need\n>>>> this adjustment.\n>>>>\n>>>> QEMU's setup_rt_frame() unconditionally used (SIGNAL_FRAMESIZE + 16)\n>>>> for both 32-bit and 64-bit, placing the handler's SP 16 bytes too low\n>>>> on ppc64. Signal delivery and return still worked because do_rt_sigreturn\n>>>> had the matching wrong offset, but the vDSO DWARF unwind info encodes\n>>>> the correct kernel offset. This caused any DWARF unwinder (libunwind,\n>>>> libgcc, etc.) to compute a CFA that is 16 bytes off, reading garbage\n>>>> register values from the signal frame.\n>>>>\n>>>> Define RT_SIGFRAME_ADJUST (0 on ppc64, 16 on ppc32) and use it in both\n>>>> setup_rt_frame and do_rt_sigreturn to match the kernel.\n>>>>\n>>>> This was verified by A/B testing with libunwind's test suite:\n>>>>\n>>>> ppc64le: Gtest-bt, Ltest-bt, Gtest-concurrent, Ltest-concurrent,\n>>>> and Ltest-sig-context all change from FAIL to PASS.\n>>>> ppc64be: Gtest-bt, Ltest-bt, and Ltest-sig-context all change\n>>>> from FAIL to PASS.\n>>>>\n>>>> Signed-off-by: Matt Turner \n>>>> ---\n>>>> linux-user/ppc/signal.c | 16 ++++++++++++++--\n>>>> 1 file changed, 14 insertions(+), 2 deletions(-)\n>>>>\n>>>\n>>> Reviewed-by: Peter Maydell \n>>\n>> Thanks!\n>>\n>> I sent this to Laurent Vivier since that's what\n>> `get_maintainer.pl` said, but I see that he hasn't committed this\n>> year. Should I wait on him, or can you see that this gets in?\n>>\n>> Also, I think this is probably worth including in the stable\n>> branch(es), so I've cc'd qemu-devel@nongnu.org.\n>>\n>> Matt\n> \n> Sorry to ping. Just trying to get clarity on what I need to do.\n\nI've picked it up into my linux-user-next git tree and will push then\nsoon:\n\nhttps://gitlab.com/hdeller/qemu/-/commits/linux-user-next?ref_type=heads\n\nHelge","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=gmx.de header.i=deller@gmx.de header.a=rsa-sha256\n header.s=s31663417 header.b=DyjTHP5G;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org 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bh=RDueuBbNS4XMf2Tf8bB8v7HAEBzI3QS/6UQ3Ciqbd70=;\n h=X-UI-Sender-Class:Message-ID:Date:MIME-Version:Subject:To:Cc:\n References:From:In-Reply-To:Content-Type:\n Content-Transfer-Encoding:cc:content-transfer-encoding:\n content-type:date:from:message-id:mime-version:reply-to:subject:\n to;\n b=DyjTHP5GfD2/6f7fnVit9HLNEdc/KOehq26OxXTEGHzyS8gELdBad7BqUmabEBXQ\n sqsENpi+K9UnDsT781w8EEeFjujuD66FbceA5cG8WTYPjet5/IIpO/IjeNprsfA4R\n a4IZ3on/l1AQwyNkn5NeEp+NbkXsz8fIRFhkMb+qos96ew8RcNFKHUZz0l5jAZ9QW\n X2nAoiyL33gtkwwmdOxzFcLx01/eFJrBdDSw/LSDh758wCaYT8VjOqHFJPRlqxhGU\n ROD5MMeOhRKXiCpq8+2qeb+Y+4oG3hVPok9jGYTqb7WCcgRS5ZdLAdQCcT+VM+HF9\n Br+kzOVSaQlwTLFohg==","X-UI-Sender-Class":"724b4f7f-cbec-4199-ad4e-598c01a50d3a","Message-ID":"<3fe78350-3ca3-4bef-a1b1-ad5523295145@gmx.de>","Date":"Thu, 23 Apr 2026 16:54:37 +0200","MIME-Version":"1.0","User-Agent":"Mozilla Thunderbird","Subject":"Re: [PATCH] linux-user/ppc: Fix ppc64 rt_sigframe stack offset","To":"Matt Turner , Peter Maydell ","Cc":"Laurent Vivier , qemu-devel@nongnu.org,\n qemu-stable@nongnu.org, Pierrick Bouvier ","References":"<20260414025335.2847358-1-mattst88@gmail.com>\n <20260416182527.3862296-1-mattst88@gmail.com>\n \n \n ","Content-Language":"en-US","From":"Helge Deller ","Autocrypt":"addr=deller@gmx.de; keydata=\n xsFNBF3Ia3MBEAD3nmWzMgQByYAWnb9cNqspnkb2GLVKzhoH2QD4eRpyDLA/3smlClbeKkWT\n HLnjgkbPFDmcmCz5V0Wv1mKYRClAHPCIBIJgyICqqUZo2qGmKstUx3pFAiztlXBANpRECgwJ\n r+8w6mkccOM9GhoPU0vMaD/UVJcJQzvrxVHO8EHS36aUkjKd6cOpdVbCt3qx8cEhCmaFEO6u\n CL+k5AZQoABbFQEBocZE1/lSYzaHkcHrjn4cQjc3CffXnUVYwlo8EYOtAHgMDC39s9a7S90L\n 69l6G73lYBD/Br5lnDPlG6dKfGFZZpQ1h8/x+Qz366Ojfq9MuuRJg7ZQpe6foiOtqwKym/zV\n dVvSdOOc5sHSpfwu5+BVAAyBd6hw4NddlAQUjHSRs3zJ9OfrEx2d3mIfXZ7+pMhZ7qX0Axlq\n Lq+B5cfLpzkPAgKn11tfXFxP+hcPHIts0bnDz4EEp+HraW+oRCH2m57Y9zhcJTOJaLw4YpTY\n GRUlF076vZ2Hz/xMEvIJddRGId7UXZgH9a32NDf+BUjWEZvFt1wFSW1r7zb7oGCwZMy2LI/G\n aHQv/N0NeFMd28z+deyxd0k1CGefHJuJcOJDVtcE1rGQ43aDhWSpXvXKDj42vFD2We6uIo9D\n 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helo=mout.gmx.net","X-Spam_score_int":"-27","X-Spam_score":"-2.8","X-Spam_bar":"--","X-Spam_report":"(-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001,\n RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=0.001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3681544,"web_url":"http://patchwork.ozlabs.org/comment/3681544/","msgid":"","list_archive_url":null,"date":"2026-04-23T15:48:53","subject":"Re: [PATCH] linux-user/ppc: Fix ppc64 rt_sigframe stack offset","submitter":{"id":7917,"url":"http://patchwork.ozlabs.org/api/people/7917/","name":"Matt Turner","email":"mattst88@gmail.com"},"content":"On Thu, Apr 23, 2026 at 10:54 AM Helge Deller wrote:\n>\n> Hi Matt,\n>\n> On 4/23/26 14:02, Matt Turner wrote:\n> > On Mon, Apr 20, 2026 at 4:59 PM Matt Turner wrote:\n> >>\n> >> On Fri, Apr 17, 2026 at 4:41 AM Peter Maydell wrote:\n> >>>\n> >>> On Thu, 16 Apr 2026 at 19:25, Matt Turner wrote:\n> >>>>\n> >>>> The kernel's 64-bit signal delivery (signal_64.c) uses:\n> >>>>\n> >>>> newsp = frame - __SIGNAL_FRAMESIZE\n> >>>>\n> >>>> while the 32-bit path (signal_32.c) uses:\n> >>>>\n> >>>> newsp = frame - (__SIGNAL_FRAMESIZE + 16)\n> >>>>\n> >>>> The extra 16 bytes in the 32-bit case is to place siginfo and ucontext\n> >>>> at the same offsets as older kernels (see the comment in signal_32.c).\n> >>>> The 64-bit rt_sigframe starts with ucontext directly and does not need\n> >>>> this adjustment.\n> >>>>\n> >>>> QEMU's setup_rt_frame() unconditionally used (SIGNAL_FRAMESIZE + 16)\n> >>>> for both 32-bit and 64-bit, placing the handler's SP 16 bytes too low\n> >>>> on ppc64. Signal delivery and return still worked because do_rt_sigreturn\n> >>>> had the matching wrong offset, but the vDSO DWARF unwind info encodes\n> >>>> the correct kernel offset. This caused any DWARF unwinder (libunwind,\n> >>>> libgcc, etc.) to compute a CFA that is 16 bytes off, reading garbage\n> >>>> register values from the signal frame.\n> >>>>\n> >>>> Define RT_SIGFRAME_ADJUST (0 on ppc64, 16 on ppc32) and use it in both\n> >>>> setup_rt_frame and do_rt_sigreturn to match the kernel.\n> >>>>\n> >>>> This was verified by A/B testing with libunwind's test suite:\n> >>>>\n> >>>> ppc64le: Gtest-bt, Ltest-bt, Gtest-concurrent, Ltest-concurrent,\n> >>>> and Ltest-sig-context all change from FAIL to PASS.\n> >>>> ppc64be: Gtest-bt, Ltest-bt, and Ltest-sig-context all change\n> >>>> from FAIL to PASS.\n> >>>>\n> >>>> Signed-off-by: Matt Turner \n> >>>> ---\n> >>>> linux-user/ppc/signal.c | 16 ++++++++++++++--\n> >>>> 1 file changed, 14 insertions(+), 2 deletions(-)\n> >>>>\n> >>>\n> >>> Reviewed-by: Peter Maydell \n> >>\n> >> Thanks!\n> >>\n> >> I sent this to Laurent Vivier since that's what\n> >> `get_maintainer.pl` said, but I see that he hasn't committed this\n> >> year. Should I wait on him, or can you see that this gets in?\n> >>\n> >> Also, I think this is probably worth including in the stable\n> >> branch(es), so I've cc'd qemu-devel@nongnu.org.\n> >>\n> >> Matt\n> >\n> > Sorry to ping. Just trying to get clarity on what I need to do.\n>\n> I've picked it up into my linux-user-next git tree and will push then\n> soon:\n>\n> https://gitlab.com/hdeller/qemu/-/commits/linux-user-next?ref_type=heads\n>\n> Helge\n\nAwesome, thanks Helge!","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=IIH/fNCs;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g1gXT3fvfz1y2d\n\tfor ; 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