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charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org SGkgTWFyayBSdXRsYW5kLAoKT24gMjAxOeuFhCAxMeyblCAxMuydvCAxODo0MCwgTWFyayBSdXRs YW5kIHdyb3RlOgo+IE9uIFR1ZSwgTm92IDEyLCAyMDE5IGF0IDEwOjAxOjQxQU0gKzA5MDAsIFNl dW5nLVdvbyBLaW0gd3JvdGU6Cj4+IElmIHBlcmYgaXMgYnVpbHQgYXMgYXJtIDMyLWJpdCwgaXQg b25seSByZWFkcyAxNSByZWdpc3RlcnMgYXMgYXJtCj4+IDMyLWJpdCByZWdpc3RlciBtYXAgYW5k IHRoaXMgYnJlYWtzIGR3YXJmIGNhbGwtY2hhaW4gaW4gY29tcGF0Cj4+IHBlcmYgYmVjYXVzZSBw YyByZWdpc3RlciBpbmZvcm1hdGlvbiBpcyBub3QgZmlsbGVkLgo+PiBSZXBvcnQgYXJtIHBjIHJl Z2lzdGVycyBmb3IgMzItYml0IGNvbXBhdCBwZXJmLgo+Pgo+PiBXaXRob3V0IHRoaXMsIGFybSAz Mi1iaXQgcGVyZiBkd2FyZiBjYWxsLWdyYXBoIHNob3dzIGJlbG93Cj4+IHZlcmJvc2UgbWVzc2Fn ZToKPj4gICB1bndpbmQ6IHJlZyAxNSwgdmFsIDAKPj4gICB1bndpbmQ6IHJlZyAxMywgdmFsIGZm YmM2MzYwCj4+ICAgdW53aW5kOiBubyBtYXAgZm9yIDAKPj4KPj4gU2lnbmVkLW9mZi1ieTogU2V1 bmctV29vIEtpbSA8c3cwMzEyLmtpbUBzYW1zdW5nLmNvbT4KPj4gLS0tCj4+ICBhcmNoL2FybTY0 L2tlcm5lbC9wZXJmX3JlZ3MuYyB8ICAgIDIgKysKPj4gIDEgZmlsZXMgY2hhbmdlZCwgMiBpbnNl cnRpb25zKCspLCAwIGRlbGV0aW9ucygtKQo+Pgo+PiBkaWZmIC0tZ2l0IGEvYXJjaC9hcm02NC9r ZXJuZWwvcGVyZl9yZWdzLmMgYi9hcmNoL2FybTY0L2tlcm5lbC9wZXJmX3JlZ3MuYwo+PiBpbmRl eCAwYmJhYzYxLi5kNDE3MmU3IDEwMDY0NAo+PiAtLS0gYS9hcmNoL2FybTY0L2tlcm5lbC9wZXJm X3JlZ3MuYwo+PiArKysgYi9hcmNoL2FybTY0L2tlcm5lbC9wZXJmX3JlZ3MuYwo+PiBAQCAtMjQs NiArMjQsOCBAQCB1NjQgcGVyZl9yZWdfdmFsdWUoc3RydWN0IHB0X3JlZ3MgKnJlZ3MsIGludCBp ZHgpCj4+ICAJCQlyZXR1cm4gcmVncy0+Y29tcGF0X3NwOwo+PiAgCQlpZiAoKHUzMilpZHggPT0g UEVSRl9SRUdfQVJNNjRfTFIpCj4+ICAJCQlyZXR1cm4gcmVncy0+Y29tcGF0X2xyOwo+PiArCQlp ZiAoKHUzMilpZHggPT0gMTUpIC8qIFBFUkZfUkVHX0FSTV9QQyAqLwo+PiArCQkJcmV0dXJuIHJl Z3MtPnBjOwo+PiAgCX0KPiAKPiBUaGlzIGRvZXNuJ3QgbG9vayBxdWl0ZSByaWdodCB0byBtZSwg c2luY2UgcGVyZl9yZWdzX3ZhbHVlKCkgaXMKPiBjb25zdW1pbmcgdGhlIGFybTY0IGluZGV4IGZv ciBhbGwgb3RoZXIgcmVnaXN0ZXJzIChlLmcuIHRoZSBMUiwgaW4gdGhlCj4gcGF0Y2ggY29udGV4 dCkuCj4gCj4gaS5lLiB0aGlzIGlzIGRlc2lnbmVkIGZvciBhIG5hdGl2ZSBhcm02NCBjYWxsZXIs IGFuZCB0aGUgZml4dXAgYWxsb3dzIGl0Cj4gdG8gdmlldyBhIGNvbXBhdCB0YXNrJ3MgcmVnaXN0 ZXJzIGFzLWlmIGl0IHdlcmUgbmF0aXZlLgo+IAo+IEhvdyBkb2VzIHRoaXMgd29yayBmb3IgYSBu YXRpdmUgYXJtNjQgcGVyZiBpbnZvY2F0aW9uIHdpdGggYSBjb21wYXQKPiB0YXNrPyBJIGFzc3Vt ZSBpdCBjb25zdW1lcnMgcmVncy0+cGMsIGFuZCB3b3JrcyBhcyBleHBlY3RlZD8KCkluIG5hdGl2 ZSBhcm02NCBwZXJmLCBjb21wYXQgdGFzayByZWdpc3RlcnMgYXJlIHNldCBhcyBhcm02NCByZWdp c3RlcgptYXAsIGFuZCBzcCwgbHIsIGFuZCBwYyBhcmUgc2V0IHByb3Blcmx5LiBCdXQgY29tcGF0 X3NwIGlzIGZyb20gcmVnc1sxM10KYW5kIGNvbXBhdF9sciBpcyBmcm9tIHJlZ3NbMTRdLCBzbyBz YW1lIHJlZ2lzdGVyIHZhbHVlcyBhcmUgc2V0IGZvcgpyZWdzWzEzXS9lZ3MtPnNwIGFuZCByZWdz WzE0XS9yZWdzLT5sci4gV2l0aCB0aGlzIGNoYW5nZSwgaXQgc2V0cwpyZWdzWzE1XSBzYW1lIHdp dGggcmVncy0+cGMsIGJ1dCB0aGUgcmVnaXN0ZXIgaXMgbm90IHVzZSBhdCBsZWFzdCBmb3IKYXJt IDMyLWJpdCBjb21wYXQgYmluYXJ5IGNhbGxjaGFpbiwgc28gbm8gaXNzdWUgYXMgZmFyIGFzIEkg dW5kZXJzdG9vZAphbmQgdGVzdGVkLgoKPiAKPiBJIHN1c3BlY3Qgd2UgbmVlZCBzZXBhcmF0ZSBu YXRpdmUgYW5kIGNvbXBhdCBmb3JtcyBvZiB0aGlzIGZ1bmN0aW9uLCBidXQKPiB0aGVuIGl0J3Mg bm90IGVudGlyZWx5IGNsZWFyIGhvdyB0aGlzIHNob3VsZCB3b3JrIC0tIGhvdyBkb2VzIHRoaXMg d29yawo+IGZvciBhIGNvbXBhdCBwZXJmIGFuYWx5c2luZyBhIG5hdGl2ZSBhcm02NCBiaW5hcnk/ CgpJIGRpZG4ndCBleHBlY3QgbmF0aXZlIGFybTY0IGJpbmFyeSBjYWxsY2hhaW4gaXMgcG9zc2li bGUgdG8gZ2V0IGZyb20KYXJtIDMyLWJpdCBwZXJmLgoKSW4gbXkgdGVzdCB3aXRoIDMyLWJpdCBj b21wYXQgcGVyZiwgaXQgc2V0cyBwZXJmCmV2ZW50LT5hdHRyLnNhbXBsZV9yZWdzX3VzZXIgYXMg MHhmZmZmLCB3aGljaCBpcyBtYXRjaGVkIHdpdGggMzItYml0CmFybSwgYnV0IGluIGFybTY0IHBl cmYgcGFydCwgaXQgY2Fubm90IGJlIGFjY2Vzc2VkLiBJZiB0aGVyZSBpcyB3YXkgdG8KY2hlY2sg aXQsIGl0IGlzIHBvc3NpYmxlIHRvIHNldCBkaWZmZXJlbmNlIHJlZ2lzdGVyIGZvcm0uIEFueXdh eSwgaW4gdGhlCmNhc2UsIG5hdGl2ZSBhcm02NCByZWdpc3RlciBtYXAgaXMgc3RpbGwgbm90IGZ1 bGx5IHJlcG9ydGVkIHRvIDMyLWJpdApjb21wYXQgcGVyZi4KCgpUaGFua3MsCi0gU2V1bmctV29v IEtpbQoKPiAKPiBUaGFua3MsCj4gTWFyay4KPiAKPiAKCi0tIApTZXVuZy1Xb28gS2ltClNhbXN1 bmcgUmVzZWFyY2gKLS0KCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdApsaW51eC1hcm0ta2VybmVsQGxp c3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0 aW5mby9saW51eC1hcm0ta2VybmVsCg== 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=-8.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,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 E6E69C43331 for ; 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Wed, 13 Nov 2019 04:13:19 +0000 (GMT) Received: from epsmgms1p2new.samsung.com (unknown [182.195.42.42]) by epsmtrp2.samsung.com (KnoxPortal) with ESMTP id 20191113041319epsmtrp2d208b704cd4fe15d818169d1abc89a39~WnZjWqNuv1978319783epsmtrp2g; Wed, 13 Nov 2019 04:13:19 +0000 (GMT) X-AuditID: b6c32a36-7e3ff70000001027-08-5dcb82e0ca3f Received: from epsmtip2.samsung.com ( [182.195.34.31]) by epsmgms1p2new.samsung.com (Symantec Messaging Gateway) with SMTP id 5B.CC.25663.FD28BCD5; Wed, 13 Nov 2019 13:13:19 +0900 (KST) Received: from [10.113.221.222] (unknown [10.113.221.222]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20191113041319epsmtip251dbdd65ca070b8cdd09d837cdcbca9e~WnZjFf1qx1180111801epsmtip2Y; Wed, 13 Nov 2019 04:13:19 +0000 (GMT) Message-ID: <5DCB8380.3070304@samsung.com> Date: Wed, 13 Nov 2019 13:16:00 +0900 From: Seung-Woo Kim Reply-To: sw0312.kim@samsung.com User-Agent: Mozilla/5.0 (X11; Linux i686; rv:16.0) Gecko/20121011 Thunderbird/16.0.1 MIME-Version: 1.0 To: Mark Rutland CC: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, will@kernel.org, catalin.marinas@arm.com, sungguk.na@samsung.com Subject: Re: [PATCH] arm64: perf: Report arm pc registers for compat perf In-Reply-To: <20191112094037.GA32269@lakrids.cambridge.arm.com> Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprMJsWRmVeSWpSXmKPExsWy7bCmvu6DptOxBrv3C1i8X9bDaLHp8TVW i8u75rBZLL1+kclix7yDjBYtd0wd2DzWzFvD6LFpVSebx+Yl9R59W1YxenzeJBfAGpVtk5Ga mJJapJCal5yfkpmXbqvkHRzvHG9qZmCoa2hpYa6kkJeYm2qr5OIToOuWmQO0X0mhLDGnFCgU kFhcrKRvZ1OUX1qSqpCRX1xiq5RakJJTYFmgV5yYW1yal66XnJ9rZWhgYGQKVJiQndGy/BRL wQSxin/bnzM3MB4T7GLk5JAQMJH40nibtYuRi0NIYAejxII706GcT4wSu/+vZYZwvjFK/L6/ kAWmZdaBz1CJvYwSl7feY4Rw3jNKzFu9GKyKV0BL4vqh5WA2i4CqxPuWbewgNpuAjsT+Jb9Z QWwhAQWJC1tnsIHYogJhEjMO9jNC9ApKnJz5BKxXREBdomfXFxaQBcwCXYwSa9+/ZgJJCAt4 Smzt3gNWxClgLzHl7CSwOLOAvETz1tlg50kI3GaTuDX7PzvE3S4Sbe9mQ9nCEq+Ob4GypSQ+ v9vLBmFXS2yf8JMdormDUaKnvRHqaWOJ/UsnA23gANqgKbF+lz5EWFFi5++5jBCL+STefe1h BSmREOCV6GgTgihRkdh5dBIbRFhKYtaGYIiwh8Syg0tYJzAqzkLy8iwkH8xC2LWAkXkVo1hq QXFuemqxYYERchRvYgQnSC2zHYyLzvkcYhTgYFTi4ZVYeCpWiDWxrLgy9xCjBAezkgjvjooT sUK8KYmVValF+fFFpTmpxYcYTYGxM5FZSjQ5H5i880riDU2NjI2NLUwMzUwNDZXEeR2XL40V EkhPLEnNTk0tSC2C6WPi4JRqYFw6b3PteetrPysT4vJYpnD0F8rnKNsrfCnfyuXU2/z9HZ/Y x1NXMrL+yv8x350/USBBNVyhvca+uyBIxu/6kf2y69c289+PP7ZOtTrviaLLzSrPzrzSlYYd P5p/XeuYEL50839x5myFj6H89QLRkicCPl2x9vo/473dljNXm6ewHpnzus0tV4mlOCPRUIu5 qDgRAIQzAsOmAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrALMWRmVeSWpSXmKPExsWy7bCSvO79ptOxBh+7ZC3eL+thtNj0+Bqr xeVdc9gsll6/yGSxY95BRouWO6YObB5r5q1h9Ni0qpPNY/OSeo++LasYPT5vkgtgjeKySUnN ySxLLdK3S+DKaFl+iqVggljFv+3PmRsYjwl2MXJySAiYSMw68Jm5i5GLQ0hgN6PEibVTmCAS UhJzv21n7GLkALKFJQ4fLoaoecso8eDdTUaQGl4BLYnrh5azgNgsAqoS71u2sYPYbAI6EvuX /GYFsYUEFCQubJ3BBmKLCoRI/Pp4hRWiV1Di5MwnYL0iAuoSPbu+sIAsYBboZpSY3/IVLCEs 4CmxtXsPC8Tm04wSV6dtAOvmFLCXmHJ2EhPIdcxA3evnCYGEmQXkJZq3zmaewCg0C8mOWQhV s5BULWBkXsUomVpQnJueW2xYYJSXWq5XnJhbXJqXrpecn7uJERwPWlo7GE+ciD/EKMDBqMTD e2DeqVgh1sSy4srcQ4wSHMxKIrw7Kk7ECvGmJFZWpRblxxeV5qQWH2KU5mBREueVzz8WKSSQ nliSmp2aWpBaBJNl4uCUamBMarrl/utGAGO/cm/+RGFWsdeLNa58r652ZOnK7yuRfipgGFJp /0yTmd1UROt32sKA8wee7dovw8tUsTaUU0zJ4AWvzzluITmN94LWWhPvq3iaHXt5+p370X7l 07q6EzsivP6ExaZXdczS2HHgs8jNJeVhJiYhn7J3JMc63968U9xkkeVvcyWW4oxEQy3mouJE AEKcHMyDAgAA X-CMS-MailID: 20191113041319epcas1p3869db73a60fe98be01c5c65149a709c9 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20191112005902epcas1p2d9dfa6a29f2c57669b1c1eb58517016d References: <1573520501-29195-1-git-send-email-sw0312.kim@samsung.com> <20191112094037.GA32269@lakrids.cambridge.arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Mark Rutland, On 2019년 11월 12일 18:40, Mark Rutland wrote: > On Tue, Nov 12, 2019 at 10:01:41AM +0900, Seung-Woo Kim wrote: >> If perf is built as arm 32-bit, it only reads 15 registers as arm >> 32-bit register map and this breaks dwarf call-chain in compat >> perf because pc register information is not filled. >> Report arm pc registers for 32-bit compat perf. >> >> Without this, arm 32-bit perf dwarf call-graph shows below >> verbose message: >> unwind: reg 15, val 0 >> unwind: reg 13, val ffbc6360 >> unwind: no map for 0 >> >> Signed-off-by: Seung-Woo Kim >> --- >> arch/arm64/kernel/perf_regs.c | 2 ++ >> 1 files changed, 2 insertions(+), 0 deletions(-) >> >> diff --git a/arch/arm64/kernel/perf_regs.c b/arch/arm64/kernel/perf_regs.c >> index 0bbac61..d4172e7 100644 >> --- a/arch/arm64/kernel/perf_regs.c >> +++ b/arch/arm64/kernel/perf_regs.c >> @@ -24,6 +24,8 @@ u64 perf_reg_value(struct pt_regs *regs, int idx) >> return regs->compat_sp; >> if ((u32)idx == PERF_REG_ARM64_LR) >> return regs->compat_lr; >> + if ((u32)idx == 15) /* PERF_REG_ARM_PC */ >> + return regs->pc; >> } > > This doesn't look quite right to me, since perf_regs_value() is > consuming the arm64 index for all other registers (e.g. the LR, in the > patch context). > > i.e. this is designed for a native arm64 caller, and the fixup allows it > to view a compat task's registers as-if it were native. > > How does this work for a native arm64 perf invocation with a compat > task? I assume it consumers regs->pc, and works as expected? In native arm64 perf, compat task registers are set as arm64 register map, and sp, lr, and pc are set properly. But compat_sp is from regs[13] and compat_lr is from regs[14], so same register values are set for regs[13]/egs->sp and regs[14]/regs->lr. With this change, it sets regs[15] same with regs->pc, but the register is not use at least for arm 32-bit compat binary callchain, so no issue as far as I understood and tested. > > I suspect we need separate native and compat forms of this function, but > then it's not entirely clear how this should work -- how does this work > for a compat perf analysing a native arm64 binary? I didn't expect native arm64 binary callchain is possible to get from arm 32-bit perf. In my test with 32-bit compat perf, it sets perf event->attr.sample_regs_user as 0xffff, which is matched with 32-bit arm, but in arm64 perf part, it cannot be accessed. If there is way to check it, it is possible to set difference register form. Anyway, in the case, native arm64 register map is still not fully reported to 32-bit compat perf. Thanks, - Seung-Woo Kim > > Thanks, > Mark. > > -- Seung-Woo Kim Samsung Research --