[{"id":3679923,"web_url":"http://patchwork.ozlabs.org/comment/3679923/","msgid":"","list_archive_url":null,"date":"2026-04-21T14:59:57","subject":"Re: [PATCH] aarch64: simplify __libc_arm_za_disable failure path","submitter":{"id":14312,"url":"http://patchwork.ozlabs.org/api/people/14312/","name":"Florian Weimer","email":"fweimer@redhat.com"},"content":"* Muhammad Kamran:\n\n> diff --git a/sysdeps/aarch64/__arm_za_disable.S b/sysdeps/aarch64/__arm_za_disable.S\n> index c9663e3bcb..f360c8c77b 100644\n> --- a/sysdeps/aarch64/__arm_za_disable.S\n> +++ b/sysdeps/aarch64/__arm_za_disable.S\n> @@ -88,16 +88,6 @@ L(save_loop):\n> L(end):\n> \tret\n> L(fail):\n> -\tpaciasp\n> -\tcfi_negate_ra_state\n> -\tstp\tx29, x30, [sp, -32]!\n> -\tcfi_adjust_cfa_offset (32)\n> -\tcfi_rel_offset (x29, 0)\n> -\tcfi_rel_offset (x30, 8)\n> -\tmov\tx29, sp\n> -\t.inst\t0x04e0e3f0 /* cntd\tx16 */\n> -\tstr\tx16, [sp, 16]\n> -\tcfi_rel_offset (46, 16)\n> \t.inst\t0xd503467f /* smstop */\n> \tadrp\tx0, L(msg)\n> \tadd\tx0, x0, :lo12:L(msg)\n\nDoesn't this drop the caller's stack frame from the backtrace? Usually,\nwe preserve those when calling noreturn functions, by avoiding a tail\ncall.\n\nThanks,\nFlorian","headers":{"Return-Path":"","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 (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=TcXOXCYk;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org\n (client-ip=38.145.34.32; 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 (1024-bit key,\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=TcXOXCYk","sourceware.org; dmarc=pass (p=quarantine dis=none)\n 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h=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n to:to:cc:cc:mime-version:mime-version:content-type:content-type:\n in-reply-to:in-reply-to:references:references;\n bh=krj+AyDwcBeX7UvNZzZUcKKCwr0d3Q84CE7KnXmGCQk=;\n b=TcXOXCYkXnBtEjq8D1dDGtKqNSLoQ/oOD1pruW/vr0g1j9LYNJgv7mlvp6ZJBHzIT/Lzse\n iV0tbH6Ef4Lr7ONRgbYqAEva0nTAkrPeNYM6lqYaokY0goWBXmPw+albbSJgQCQGvoYaJs\n YDJKljMTKQlUn7OeDvz298BAKAvf/Cc=","X-MC-Unique":"lE8Q35DpMX2luVAMwWlGWA-1","X-Mimecast-MFC-AGG-ID":"lE8Q35DpMX2luVAMwWlGWA_1776783601","From":"Florian Weimer ","To":"Muhammad Kamran ","Cc":", Wilco Dijkstra ,\n Yury Khrustalev ","Subject":"Re: [PATCH] aarch64: simplify __libc_arm_za_disable failure path","In-Reply-To":"<20260421130804.66597-1-muhammad.kamran@arm.com> (Muhammad\n Kamran's message of \"Tue, 21 Apr 2026 13:08:04 +0000\")","References":"<20260421130804.66597-1-muhammad.kamran@arm.com>","Date":"Tue, 21 Apr 2026 16:59:57 +0200","Message-ID":"","User-Agent":"Gnus/5.13 (Gnus v5.13)","MIME-Version":"1.0","X-Scanned-By":"MIMEDefang 3.4.1 on 10.30.177.4","X-Mimecast-Spam-Score":"0","X-Mimecast-MFC-PROC-ID":"ki6eAXk789lj3raPTctDVca_VDjwAJOJ4YCv75NoU8U_1776783601","X-Mimecast-Originator":"redhat.com","Content-Type":"text/plain","X-BeenThere":"libc-alpha@sourceware.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Libc-alpha mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org"}},{"id":3680623,"web_url":"http://patchwork.ozlabs.org/comment/3680623/","msgid":"","list_archive_url":null,"date":"2026-04-22T13:15:03","subject":"Re: [PATCH] aarch64: simplify __libc_arm_za_disable failure path","submitter":{"id":67598,"url":"http://patchwork.ozlabs.org/api/people/67598/","name":"Wilco Dijkstra","email":"Wilco.Dijkstra@arm.com"},"content":"Hi Florian/Muhammad,\n\n\n>  L(fail):\n> -     paciasp\n> -     cfi_negate_ra_state\n> -     stp     x29, x30, [sp, -32]!\n> -     cfi_adjust_cfa_offset (32)\n> -     cfi_rel_offset (x29, 0)\n> -     cfi_rel_offset (x30, 8)\n> -     mov     x29, sp\n> -     .inst   0x04e0e3f0  /* cntd     x16  */\n> -     str     x16, [sp, 16]\n> -     cfi_rel_offset (46, 16)\n>        .inst   0xd503467f  /* smstop  */\n>        adrp    x0, L(msg)\n>        add     x0, x0, :lo12:L(msg)\n\n bl HIDDEN_JUMPTARGET (__libc_fatal)\n\nThis should be changed to a tailcall.\n\n> Doesn't this drop the caller's stack frame from the backtrace?  Usually,\n> we preserve those when calling noreturn functions, by avoiding a tail\n> call.\n\nBy changing it to a tailcall, the frame of the caller will be shown at the point\nof the call to __libc_arm_za_disable (which is enough context).\n\nCheers,\nWilco","headers":{"Return-Path":"","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 (1024-bit key;\n unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256\n header.s=selector1 header.b=q6ytiTRs;\n\tdkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com\n header.a=rsa-sha256 header.s=selector1 header.b=q6ytiTRs;\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 (1024-bit key,\n unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256\n header.s=selector1 header.b=q6ytiTRs;\n\tdkim=pass (1024-bit key) 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aarch64: simplify __libc_arm_za_disable failure path","submitter":{"id":66065,"url":"http://patchwork.ozlabs.org/api/people/66065/","name":"Adhemerval Zanella","email":"adhemerval.zanella@linaro.org"},"content":"On 21/04/26 10:08, Muhammad Kamran wrote:\n> The failure tail of __libc_arm_za_disable only leads to\n> __libc_fatal, so it does not need to preserve call frame state.\n> \n> Remove the PAC prologue, frame setup, saved cntd value, stack\n> stores, and associated CFI directives from the fatal path, leaving\n> only the required SME state shutdown and fatal call.\n> \n> Add tst-sme-za-disable-fail to exercise the abort path by providing\n> a TPIDR2 block with non-zero reserved bytes and checking that the\n> process terminates with SIGABRT and the expected fatal message.\n> ---\n> sysdeps/aarch64/Makefile | 2 +\n> sysdeps/aarch64/__arm_za_disable.S | 10 ----\n> sysdeps/aarch64/tst-sme-helper.h | 12 ++--\n> sysdeps/aarch64/tst-sme-za-disable-fail.c | 67 +++++++++++++++++++++++\n> 4 files changed, 75 insertions(+), 16 deletions(-)\n> create mode 100644 sysdeps/aarch64/tst-sme-za-disable-fail.c\n> \n> diff --git a/sysdeps/aarch64/Makefile b/sysdeps/aarch64/Makefile\n> index d6c5cc96ca..57132179fd 100644\n> --- a/sysdeps/aarch64/Makefile\n> +++ b/sysdeps/aarch64/Makefile\n> @@ -82,9 +82,11 @@ tests-internal += \\\n> tst-sme-clone3 \\\n> tst-sme-fork \\\n> tst-sme-vfork \\\n> + tst-sme-za-disable-fail \\\n> # tests-internal\n> \n> $(objpfx)tst-sme-clone3: $(objpfx)clone3.o $(objpfx)__arm_za_disable.o\n> +$(objpfx)tst-sme-za-disable-fail: $(objpfx)__arm_za_disable.o\n> endif\n> \n> ifeq ($(subdir),malloc)\n> diff --git a/sysdeps/aarch64/__arm_za_disable.S b/sysdeps/aarch64/__arm_za_disable.S\n> index c9663e3bcb..f360c8c77b 100644\n> --- a/sysdeps/aarch64/__arm_za_disable.S\n> +++ b/sysdeps/aarch64/__arm_za_disable.S\n> @@ -88,16 +88,6 @@ L(save_loop):\n> L(end):\n> \tret\n> L(fail):\n> -\tpaciasp\n> -\tcfi_negate_ra_state\n> -\tstp\tx29, x30, [sp, -32]!\n> -\tcfi_adjust_cfa_offset (32)\n> -\tcfi_rel_offset (x29, 0)\n> -\tcfi_rel_offset (x30, 8)\n> -\tmov\tx29, sp\n> -\t.inst\t0x04e0e3f0 /* cntd\tx16 */\n> -\tstr\tx16, [sp, 16]\n> -\tcfi_rel_offset (46, 16)\n> \t.inst\t0xd503467f /* smstop */\n> \tadrp\tx0, L(msg)\n> \tadd\tx0, x0, :lo12:L(msg)\n> diff --git a/sysdeps/aarch64/tst-sme-helper.h b/sysdeps/aarch64/tst-sme-helper.h\n> index 2ae2cc2f47..66e016f0b8 100644\n> --- a/sysdeps/aarch64/tst-sme-helper.h\n> +++ b/sysdeps/aarch64/tst-sme-helper.h\n> @@ -23,7 +23,7 @@ struct blk {\n> };\n> \n> /* Read SVCR to get SM (bit0) and ZA (bit1) state. */\n> -static unsigned long\n> +static unsigned long __attribute__ ((unused))\n\nUse __attribute_maybe_unused__ or defined it as inline.\n\n> get_svcr (void)\n> {\n> register unsigned long x0 asm (\"x0\");\n> @@ -34,7 +34,7 @@ get_svcr (void)\n> }\n> \n> /* Returns tpidr2. */\n> -static void *\n> +static __attribute__ ((unused)) void *\n> get_tpidr2 (void)\n> {\n> register unsigned long x0 asm (\"x0\");\n> @@ -45,7 +45,7 @@ get_tpidr2 (void)\n> }\n> \n> /* Obtains current streaming SVE vector register size. */\n> -static unsigned long\n> +static unsigned long __attribute__ ((unused))\n> get_svl (void)\n> {\n> register unsigned long x0 asm (\"x0\");\n> @@ -56,7 +56,7 @@ get_svl (void)\n> }\n> \n> /* PSTATE.ZA = 1, set ZA state to active. */\n> -static void\n> +static void __attribute__ ((unused))\n> start_za (void)\n> {\n> asm volatile (\n> @@ -64,7 +64,7 @@ start_za (void)\n> }\n> \n> /* Load data into ZA byte by byte from p. */\n> -static void __attribute__ ((noinline))\n> +static void __attribute__ ((noinline, unused))\n> load_za (const void *buf, unsigned long svl)\n> {\n> register unsigned long x15 asm (\"x15\") = 0;\n> @@ -84,7 +84,7 @@ load_za (const void *buf, unsigned long svl)\n> }\n> \n> /* Set tpidr2 to BLK. */\n> -static void\n> +static void __attribute__ ((unused))\n> set_tpidr2 (struct blk *blk)\n> {\n> register unsigned long x0 asm (\"x0\") = (unsigned long)blk;\n> diff --git a/sysdeps/aarch64/tst-sme-za-disable-fail.c b/sysdeps/aarch64/tst-sme-za-disable-fail.c\n> new file mode 100644\n> index 0000000000..d3a6bebaf9\n> --- /dev/null\n> +++ b/sysdeps/aarch64/tst-sme-za-disable-fail.c\n> @@ -0,0 +1,67 @@\n> +/* Test that __libc_arm_za_disable aborts on unknown TPIDR2 extensions.\n> + Copyright (C) 2026 Free Software Foundation, Inc.\n> + This file is part of the GNU C Library.\n> +\n> + The GNU C Library is free software; you can redistribute it and/or\n> + modify it under the terms of the GNU Lesser General Public\n> + License as published by the Free Software Foundation; either\n> + version 2.1 of the License, or (at your option) any later version.\n> +\n> + The GNU C Library is distributed in the hope that it will be useful,\n> + but WITHOUT ANY WARRANTY; without even the implied warranty of\n> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU\n> + Lesser General Public License for more details.\n> +\n> + You should have received a copy of the GNU Lesser General Public\n> + License along with the GNU C Library; if not, see\n> + . */\n> +\n> +#include \n> +#include \n> +#include \n> +\n> +#include \n> +#include \n> +#include \n> +\n> +#include \"tst-sme-helper.h\"\n> +\n> +extern void __libc_arm_za_disable (void);\n> +\n> +/* Required by __arm_za_disable.o and provided by the startup code\n> + as a hidden symbol. */\n> +uint64_t _dl_hwcap2;\n> +\n> +static struct blk blk = {\n> + .za_save_buffer = NULL,\n> + .num_za_save_slices = 0,\n> + .__reserved = { 1, 0, 0, 0, 0, 0 },\n> +};\n> +\n> +static void\n> +do_abort (void *closure)\n> +{\n> + start_za ();\n> + set_tpidr2 (closure);\n> + __libc_arm_za_disable ();\n> +}\n> +\n> +static int\n> +do_test (void)\n> +{\n> + _dl_hwcap2 = getauxval (AT_HWCAP2);\n> + if ((_dl_hwcap2 & HWCAP2_SME) == 0)\n> + FAIL_UNSUPPORTED (\"kernel or CPU does not support SME\");\n> +\n> + struct support_capture_subprocess result\n> + = support_capture_subprocess (do_abort, &blk);\n> + support_capture_subprocess_check (&result, \"tst-sme-za-disable-fail\",\n> +\t\t\t\t -SIGABRT, sc_allow_stderr);\n> + TEST_COMPARE_STRING (result.err.buffer,\n> +\t\t \"FATAL: __libc_arm_za_disable failed.\\n\");\n> + support_capture_subprocess_free (&result);\n> +\n> + return 0;\n> +}\n> +\n> +#include ","headers":{"Return-Path":"","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=cqhqt3Yj;\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; 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