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GET /api/patches/2195761/?format=api
{ "id": 2195761, "url": "http://patchwork.ozlabs.org/api/patches/2195761/?format=api", "web_url": "http://patchwork.ozlabs.org/project/glibc/patch/20260211191928.988805-6-adhemerval.zanella@linaro.org/", "project": { "id": 41, "url": "http://patchwork.ozlabs.org/api/projects/41/?format=api", "name": "GNU C Library", "link_name": "glibc", "list_id": "libc-alpha.sourceware.org", "list_email": "libc-alpha@sourceware.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260211191928.988805-6-adhemerval.zanella@linaro.org>", "list_archive_url": null, "date": "2026-02-11T18:55:32", "name": "[5/5] Support loading libunwind instead of libgcc_s", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "4210e96492664289d127264e947454f8128b4c1b", "submitter": { "id": 66065, "url": "http://patchwork.ozlabs.org/api/people/66065/?format=api", "name": "Adhemerval Zanella", "email": "adhemerval.zanella@linaro.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/glibc/patch/20260211191928.988805-6-adhemerval.zanella@linaro.org/mbox/", "series": [ { "id": 491898, "url": "http://patchwork.ozlabs.org/api/series/491898/?format=api", "web_url": "http://patchwork.ozlabs.org/project/glibc/list/?series=491898", "date": "2026-02-11T18:55:31", "name": "Enable glibc build with LLVM compiler-rt and libunwind", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/491898/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2195761/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2195761/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "libc-alpha@sourceware.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "libc-alpha@sourceware.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=M+I1BZXf;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org\n (client-ip=2620:52:6:3111::32; helo=vm01.sourceware.org;\n envelope-from=libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org;\n receiver=patchwork.ozlabs.org)", "sourceware.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=M+I1BZXf", "sourceware.org;\n dmarc=pass (p=none dis=none) header.from=linaro.org", "sourceware.org; spf=pass smtp.mailfrom=linaro.org", "server2.sourceware.org;\n arc=none smtp.remote-ip=2607:f8b0:4864:20::b131" ], "Received": [ "from vm01.sourceware.org (vm01.sourceware.org\n [IPv6:2620:52:6:3111::32])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fB7cH5GNKz1xpY\n\tfor <incoming@patchwork.ozlabs.org>; Thu, 12 Feb 2026 06:22:39 +1100 (AEDT)", "from vm01.sourceware.org (localhost [127.0.0.1])\n\tby sourceware.org (Postfix) with ESMTP id D49084BA23D5\n\tfor <incoming@patchwork.ozlabs.org>; Wed, 11 Feb 2026 19:22:37 +0000 (GMT)", "from mail-yx1-xb131.google.com (mail-yx1-xb131.google.com\n [IPv6:2607:f8b0:4864:20::b131])\n by sourceware.org (Postfix) with ESMTPS id F10D84BA23E1\n for <libc-alpha@sourceware.org>; Wed, 11 Feb 2026 19:19:46 +0000 (GMT)", "by mail-yx1-xb131.google.com with SMTP id\n 956f58d0204a3-649278a69c5so6590563d50.3\n for <libc-alpha@sourceware.org>; Wed, 11 Feb 2026 11:19:46 -0800 (PST)", "from mandiga.. 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J . Lu\" <hjl.tools@gmail.com>", "Subject": "[PATCH 5/5] Support loading libunwind instead of libgcc_s", "Date": "Wed, 11 Feb 2026 15:55:32 -0300", "Message-ID": "<20260211191928.988805-6-adhemerval.zanella@linaro.org>", "X-Mailer": "git-send-email 2.43.0", "In-Reply-To": "<20260211191928.988805-1-adhemerval.zanella@linaro.org>", "References": "<20260211191928.988805-1-adhemerval.zanella@linaro.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-BeenThere": "libc-alpha@sourceware.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Libc-alpha mailing list <libc-alpha.sourceware.org>", "List-Unsubscribe": "<https://sourceware.org/mailman/options/libc-alpha>,\n <mailto:libc-alpha-request@sourceware.org?subject=unsubscribe>", "List-Archive": "<https://sourceware.org/pipermail/libc-alpha/>", "List-Post": "<mailto:libc-alpha@sourceware.org>", "List-Help": "<mailto:libc-alpha-request@sourceware.org?subject=help>", "List-Subscribe": "<https://sourceware.org/mailman/listinfo/libc-alpha>,\n <mailto:libc-alpha-request@sourceware.org?subject=subscribe>", "Errors-To": "libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org" }, "content": "The 'unwind-link' facility allows glibc to support thread cancellation\nand exit (pthread_cancel, pthread_exiti, backtrace) by dynamically\nloading the unwind library at runtime, preventing a hard dependency on\nlibgcc_s within libc.so.\n\nWhen building with libunwind (for clang/LLVM toolchains), two assumptions\nin the existing code break:\n\n 1. The runtime library is libunwind.so instead of libgcc_s.so.\n\n 2. libgcc relies on __gcc_personality_v0 to handle unwinding mechanics.\n libunwind exposes the standard '_Unwind_*' accessors directly.\n\nThis patch adapts `unwind-link` to handle both environments based on\nthe HAVE_CC_WITH_LIBUNWIND configuration:\n\n * The UNWIND_SONAME macro now selects between LIBGCC_S_SO and\n LIBUNWIND_SO.\n\n * For libgcc, it continues to resolve `__gcc_personality_v0`.\n\n * For libunwind, it instead resolves the standard\n _Unwind_GetLanguageSpecificData, _Unwind_SetGR, _Unwind_SetIP,\n and _Unwind_GetRegionStart helpers.\n\n * unwind-resume.c is updated to implement wrappers for these\n accessors that forward calls to the dynamically loaded function\n pointers, effectively shimming the unwinder.\n\nTests and Makefiles are updated to link against `$(libunwind)` where\nappropriate.\n---\n elf/Makefile | 2 ++\n misc/unwind-link.c | 34 ++++++++++++++++++++++++++++++++-\n nptl/pthread_cancel.c | 2 +-\n nptl/pthread_exit.c | 2 +-\n shlib-versions | 2 ++\n sysdeps/generic/unwind-link.h | 13 +++++++++++++\n sysdeps/generic/unwind-resume.c | 32 +++++++++++++++++++++++++++++++\n 7 files changed, 84 insertions(+), 3 deletions(-)", "diff": "diff --git a/elf/Makefile b/elf/Makefile\nindex 3782045d06..6e5f98c8c9 100644\n--- a/elf/Makefile\n+++ b/elf/Makefile\n@@ -2769,6 +2769,8 @@ $(objpfx)tst-big-note-lib.so: $(objpfx)tst-big-note-lib.o\n \t$(LINK.o) -shared -o $@ $(LDFLAGS.so) $(dt-relr-ldflag) $<\n \n $(objpfx)tst-unwind-ctor: $(objpfx)tst-unwind-ctor-lib.so\n+LDLIBS-tst-unwind-ctor += $(libunwind)\n+LDFLAGS-tst-unwind-ctor-lib.so = -Wl,--unresolved-symbols=ignore-all\n \n CFLAGS-tst-unwind-main.c += -funwind-tables -DUSE_PTHREADS=0\n \ndiff --git a/misc/unwind-link.c b/misc/unwind-link.c\nindex 6019dacf66..c5c1a3ea69 100644\n--- a/misc/unwind-link.c\n+++ b/misc/unwind-link.c\n@@ -37,6 +37,12 @@ static void *global_libgcc_handle;\n may depend on unwinding. */\n __libc_lock_define (static, lock);\n \n+#ifndef HAVE_CC_WITH_LIBUNWIND\n+# define UNWIND_SONAME LIBGCC_S_SO\n+#else\n+# define UNWIND_SONAME LIBUNWIND_SO\n+#endif\n+\n struct unwind_link *\n __libc_unwind_link_get (void)\n {\n@@ -48,7 +54,7 @@ __libc_unwind_link_get (void)\n /* Initialize a copy of the data, so that we do not need about\n unlocking in case the dynamic loader somehow triggers\n unwinding. */\n- void *local_libgcc_handle = __libc_dlopen (LIBGCC_S_SO);\n+ void *local_libgcc_handle = __libc_dlopen (UNWIND_SONAME);\n if (local_libgcc_handle == NULL)\n {\n __libc_lock_unlock (lock);\n@@ -72,8 +78,19 @@ __libc_unwind_link_get (void)\n local.ptr___frame_state_for\n = __libc_dlsym (local_libgcc_handle, \"__frame_state_for\");\n #endif\n+#ifndef HAVE_CC_WITH_LIBUNWIND\n local.ptr_personality\n = __libc_dlsym (local_libgcc_handle, \"__gcc_personality_v0\");\n+#else\n+ local.ptr__Unwind_GetLanguageSpecificData\n+ = __libc_dlsym (local_libgcc_handle, \"_Unwind_GetLanguageSpecificData\");\n+ local.ptr__Unwind_SetGR\n+ = __libc_dlsym (local_libgcc_handle, \"_Unwind_SetGR\");\n+ local.ptr__Unwind_SetIP\n+ = __libc_dlsym (local_libgcc_handle, \"_Unwind_SetIP\");\n+ local.ptr__Unwind_GetRegionStart\n+ = __libc_dlsym (local_libgcc_handle, \"_Unwind_GetRegionStart\");\n+#endif\n UNWIND_LINK_EXTRA_INIT\n \n /* If a symbol is missing, libgcc_s has somehow been corrupted. */\n@@ -84,7 +101,15 @@ __libc_unwind_link_get (void)\n assert (local.ptr__Unwind_GetIP != NULL);\n #endif\n assert (local.ptr__Unwind_Resume != NULL);\n+#ifndef HAVE_CC_WITH_LIBUNWIND\n assert (local.ptr_personality != NULL);\n+#else\n+ assert (local.ptr__Unwind_GetLanguageSpecificData != NULL);\n+ assert (local.ptr__Unwind_SetGR != NULL);\n+ assert (local.ptr__Unwind_GetIP != NULL);\n+ assert (local.ptr__Unwind_SetIP != NULL);\n+ assert (local.ptr__Unwind_GetRegionStart != NULL);\n+#endif\n \n PTR_MANGLE (local.ptr__Unwind_Backtrace);\n PTR_MANGLE (local.ptr__Unwind_ForcedUnwind);\n@@ -96,7 +121,14 @@ __libc_unwind_link_get (void)\n #if UNWIND_LINK_FRAME_STATE_FOR\n PTR_MANGLE (local.ptr___frame_state_for);\n #endif\n+#ifndef HAVE_CC_WITH_LIBUNWIND\n PTR_MANGLE (local.ptr_personality);\n+#else\n+ PTR_MANGLE (local.ptr__Unwind_GetLanguageSpecificData);\n+ PTR_MANGLE (local.ptr__Unwind_SetGR);\n+ PTR_MANGLE (local.ptr__Unwind_SetIP);\n+ PTR_MANGLE (local.ptr__Unwind_GetRegionStart);\n+#endif\n \n __libc_lock_lock (lock);\n if (atomic_load_relaxed (&global_libgcc_handle) != NULL)\ndiff --git a/nptl/pthread_cancel.c b/nptl/pthread_cancel.c\nindex 5fe31c266c..6757ea2ba4 100644\n--- a/nptl/pthread_cancel.c\n+++ b/nptl/pthread_cancel.c\n@@ -87,7 +87,7 @@ __pthread_cancel (pthread_t th)\n {\n struct unwind_link *unwind_link = __libc_unwind_link_get ();\n if (unwind_link == NULL)\n- __libc_fatal (LIBGCC_S_SO\n+ __libc_fatal (UNWIND_SONAME\n \t\t \" must be installed for pthread_cancel to work\\n\");\n }\n #endif\ndiff --git a/nptl/pthread_exit.c b/nptl/pthread_exit.c\nindex 4c15171992..1ed5ed52c4 100644\n--- a/nptl/pthread_exit.c\n+++ b/nptl/pthread_exit.c\n@@ -28,7 +28,7 @@ __pthread_exit (void *value)\n {\n struct unwind_link *unwind_link = __libc_unwind_link_get ();\n if (unwind_link == NULL)\n- __libc_fatal (LIBGCC_S_SO\n+ __libc_fatal (UNWIND_SONAME\n \" must be installed for pthread_exit to work\\n\");\n }\n #endif\ndiff --git a/shlib-versions b/shlib-versions\nindex b1fd0a5eab..32093228c4 100644\n--- a/shlib-versions\n+++ b/shlib-versions\n@@ -68,3 +68,5 @@ libmvec=1\n \n # The malloc debug library\n libc_malloc_debug=0\n+\n+libunwind=1\ndiff --git a/sysdeps/generic/unwind-link.h b/sysdeps/generic/unwind-link.h\nindex 1150cda219..ea39e525d2 100644\n--- a/sysdeps/generic/unwind-link.h\n+++ b/sysdeps/generic/unwind-link.h\n@@ -34,6 +34,12 @@ unwind_arch_adjustment (void *prev, void *addr)\n # include <pointer_guard.h>\n # include <unwind-resume.h>\n \n+# ifndef HAVE_CC_WITH_LIBUNWIND\n+# define UNWIND_SONAME LIBGCC_S_SO\n+# else\n+# define UNWIND_SONAME LIBUNWIND_SO\n+# endif\n+\n # if UNWIND_LINK_FRAME_STATE_FOR\n struct frame_state;\n # endif\n@@ -50,7 +56,14 @@ struct unwind_link\n #if UNWIND_LINK_FRAME_STATE_FOR\n struct frame_state *(*ptr___frame_state_for) (void *, struct frame_state *);\n #endif\n+#ifndef HAVE_CC_WITH_LIBUNWIND\n _Unwind_Reason_Code (*ptr_personality) PERSONALITY_PROTO;\n+#else\n+ __typeof (_Unwind_GetLanguageSpecificData) *ptr__Unwind_GetLanguageSpecificData;\n+ __typeof (_Unwind_SetGR) *ptr__Unwind_SetGR;\n+ __typeof (_Unwind_SetIP) *ptr__Unwind_SetIP;\n+ __typeof (_Unwind_GetRegionStart) *ptr__Unwind_GetRegionStart;\n+#endif\n UNWIND_LINK_EXTRA_FIELDS\n };\n \ndiff --git a/sysdeps/generic/unwind-resume.c b/sysdeps/generic/unwind-resume.c\nindex de176a1f72..18c40501bb 100644\n--- a/sysdeps/generic/unwind-resume.c\n+++ b/sysdeps/generic/unwind-resume.c\n@@ -38,11 +38,43 @@ _Unwind_Resume (struct _Unwind_Exception *exc)\n }\n #endif\n \n+#ifndef HAVE_CC_WITH_LIBUNWIND\n _Unwind_Reason_Code\n __gcc_personality_v0 PERSONALITY_PROTO\n {\n return UNWIND_LINK_PTR (link (), personality) PERSONALITY_ARGS;\n }\n+#else\n+void *\n+_Unwind_GetLanguageSpecificData (struct _Unwind_Context *context)\n+{\n+ return UNWIND_LINK_PTR (link (), _Unwind_GetLanguageSpecificData) (context);\n+}\n+\n+void\n+_Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val)\n+{\n+ UNWIND_LINK_PTR (link (), _Unwind_SetGR) (context, index, val);\n+}\n+\n+_Unwind_Ptr\n+_Unwind_GetIP (struct _Unwind_Context *context)\n+{\n+ return UNWIND_LINK_PTR (link (), _Unwind_GetIP) (context);\n+}\n+\n+void\n+_Unwind_SetIP (struct _Unwind_Context *context, _Unwind_Ptr val)\n+{\n+ UNWIND_LINK_PTR (link (), _Unwind_SetIP) (context, val);\n+}\n+\n+_Unwind_Ptr\n+_Unwind_GetRegionStart (struct _Unwind_Context *context)\n+{\n+ return UNWIND_LINK_PTR (link (), _Unwind_GetRegionStart) (context);\n+}\n+#endif\n \n _Unwind_Reason_Code\n _Unwind_ForcedUnwind (struct _Unwind_Exception *exc, _Unwind_Stop_Fn stop,\n", "prefixes": [ "5/5" ] }