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Tue, 5 May 2026 12:17:28 +0000 (GMT) From: Jens Remus To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, x86@kernel.org, Steven Rostedt , Josh Poimboeuf , Indu Bhagat , Peter Zijlstra , Dylan Hatch , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Mathieu Desnoyers , Kees Cook , Sam James Cc: Jens Remus , bpf@vger.kernel.org, linux-mm@kvack.org, Namhyung Kim , Andrii Nakryiko , "Jose E. Marchesi" , Beau Belgrave , Florian Weimer , "Carlos O'Donell" , Masami Hiramatsu , Jiri Olsa , Arnaldo Carvalho de Melo , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Heiko Carstens , Vasily Gorbik , Ilya Leoshkevich , "Steven Rostedt (Google)" Subject: [PATCH v14 18/19] unwind_user/sframe/x86: Enable sframe unwinding on x86 Date: Tue, 5 May 2026 14:17:17 +0200 Message-ID: <20260505121718.3572346-19-jremus@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260505121718.3572346-1-jremus@linux.ibm.com> References: <20260505121718.3572346-1-jremus@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTA1MDExNCBTYWx0ZWRfX5eIgOiYSAVYE gElSVNIYwjC+gm3x9lJpoB3LhvyZaM8ze69qZvB0gkry/I2PHAEKK/M+0J5TilUholuTcn6JMjy RqwDtQzBNP7c52ykWcs4vBzV8Kp7lzrSkEbL6vCRA2Syg9STB8zwvaEnB1/qoC3w2XsxAeJUvH4 nVpavikiq9He78B41gzJu+SY2m6RDpEwuKrwO8UPKFNg4Eh/EWQ/k/CNR4fo+/Du9BzfYuwy9cX lxbSQYuxBhp5/sShe0Y+SG+yB2YJXfR1cQsWPvL8lyyfY5fvuyPDLd2NVVD9jZEQelF2KxfCteg Lo3sQc4HS8+QPHcyDi0cnci2/EfR70uH4wXjtMQgEDVFiCM9c2XFCdV984+Q/5cxQKBGbxOtlTN xvUMXQJ7TmNMi5rnc5guWvcMBxmX3RF3edENd8v02WbNpszEIzStA4PU7xKMSwGcXRBtsubJ9rv kNWp0wqRkScUu6NA6MQ== X-Proofpoint-ORIG-GUID: AQlMQiA4R5gyjNW1nup077lPuGq6n5_t X-Proofpoint-GUID: rWYMWQbXEDhvt5xo-cN5CNnAkkafnuaD X-Authority-Analysis: v=2.4 cv=ctWrVV4i c=1 sm=1 tr=0 ts=69f9dfde cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VwQbUJbxAAAA:8 a=meVymXHHAAAA:8 a=pGLkceISAAAA:8 a=VnNF1IyMAAAA:8 a=Nb24OjdhCh9FoptYTSsA:9 a=2JgSa4NbpEOStq-L5dxp:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-05_02,2026-04-30_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 clxscore=1011 suspectscore=0 impostorscore=0 spamscore=0 malwarescore=0 phishscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605050114 X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 768301C0004 X-Stat-Signature: 7k8iszteqksppurdyeps4oobehssjda5 X-HE-Tag: 1777983492-28693 X-HE-Meta: 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 gTP3Ffrh y6HzGE401Hs90vQ5oJMU68YNni15tl3tQFVqegSdt9sEfFYeOnQDu33v0VTHgEV8T9S8aZRFSnE1z/jA53DxwPGmEk/9ytRcogJKIMKN8AUPYvX36W/pw+S5S+xhcQ+g8fTQKNjORat5Nb2Wet8XqNpQ2DEeFGFHOUqDHC3nTuG7iRoingsmWB5zwxIlOlleQ8Bi/VS9absLz33cQCHStyS6r7iSbRS15EaUKxlOlkH+Bdz/abllpQDgaI7f6aTWwuQhB1RF1wNqU2IEcTvthdjmEn30URPCjyyK3VpjoICLswYoCtcOU71G7eCkO+A8WFVSwzDchH1sgJDmcvh88GV7CiIm+ODj1SNfW Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Josh Poimboeuf The x86 SFrame V3 implementation works fairly well, starting with binutils 2.46. Enable it. [ Jens Remus: Reword commit message for SFrame V3, starting with binutils 2.46. ] Signed-off-by: Josh Poimboeuf Signed-off-by: Steven Rostedt (Google) Reviewed-by: Indu Bhagat Signed-off-by: Jens Remus --- Notes (jremus): Changes in v14: - Drop superfluous empty line in unwind_user_get_reg(). Changes in v13: - Naive implementation of unwind_user_get_reg() to support SFrame V3 flexible FDEs (e.g. used to represent DRAP pattern). - Define SFRAME_REG_SP and SFRAME_REG_FP to the respective x86-64 DWARF register numbers. - Reword commit message for SFrame V3 and (upcoming) binutils 2.46. arch/x86/Kconfig | 1 + arch/x86/include/asm/unwind_user.h | 33 +++++++++++++++++++++++ arch/x86/include/asm/unwind_user_sframe.h | 12 +++++++++ 3 files changed, 46 insertions(+) create mode 100644 arch/x86/include/asm/unwind_user_sframe.h diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index f3f7cb01d69d..51286dfdb5f4 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -302,6 +302,7 @@ config X86 select HAVE_UACCESS_VALIDATION if HAVE_OBJTOOL select HAVE_UNSTABLE_SCHED_CLOCK select HAVE_UNWIND_USER_FP if X86_64 + select HAVE_UNWIND_USER_SFRAME if X86_64 select HAVE_USER_RETURN_NOTIFIER select HAVE_GENERIC_VDSO select VDSO_GETRANDOM if X86_64 diff --git a/arch/x86/include/asm/unwind_user.h b/arch/x86/include/asm/unwind_user.h index f38f7c5ff1de..b80f0ec0f7a7 100644 --- a/arch/x86/include/asm/unwind_user.h +++ b/arch/x86/include/asm/unwind_user.h @@ -15,6 +15,39 @@ static inline int unwind_user_word_size(struct pt_regs *regs) return user_64bit_mode(regs) ? 8 : 4; } +static inline int unwind_user_get_reg(unsigned long *val, unsigned int regnum) +{ +#ifdef CONFIG_X86_64 + const struct pt_regs *regs = task_pt_regs(current); + + switch (regnum) { + /* DWARF register numbers 0..15 */ + case 0: *val = regs->ax; break; + case 1: *val = regs->dx; break; + case 2: *val = regs->cx; break; + case 3: *val = regs->bx; break; + case 4: *val = regs->si; break; + case 5: *val = regs->di; break; + case 6: *val = regs->bp; break; + case 7: *val = regs->sp; break; + case 8: *val = regs->r8; break; + case 9: *val = regs->r9; break; + case 10: *val = regs->r10; break; + case 11: *val = regs->r11; break; + case 12: *val = regs->r12; break; + case 13: *val = regs->r13; break; + case 14: *val = regs->r14; break; + case 15: *val = regs->r15; break; + default: + return -EINVAL; + } + return 0; +#else /* !CONFIG_X86_64 */ + return -EINVAL; +#endif /* !CONFIG_X86_64 */ +} +#define unwind_user_get_reg unwind_user_get_reg + #endif /* CONFIG_UNWIND_USER */ #ifdef CONFIG_HAVE_UNWIND_USER_FP diff --git a/arch/x86/include/asm/unwind_user_sframe.h b/arch/x86/include/asm/unwind_user_sframe.h new file mode 100644 index 000000000000..d828ae1a4aac --- /dev/null +++ b/arch/x86/include/asm/unwind_user_sframe.h @@ -0,0 +1,12 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_UNWIND_USER_SFRAME_H +#define _ASM_X86_UNWIND_USER_SFRAME_H + +#ifdef CONFIG_X86_64 + +#define SFRAME_REG_SP 7 +#define SFRAME_REG_FP 6 + +#endif + +#endif /* _ASM_X86_UNWIND_USER_SFRAME_H */ -- 2.51.0