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Mon, 17 Jun 2024 09:56:38 -0400 X-MC-Unique: lF3IrM_aOzGIOhY00gwquw-1 Received: from mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.40]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id EC9DF1954B25 for ; Mon, 17 Jun 2024 13:56:36 +0000 (UTC) Received: from oldenburg.str.redhat.com (unknown [10.39.192.203]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 3551A19560B9 for ; Mon, 17 Jun 2024 13:56:35 +0000 (UTC) From: Florian Weimer To: libc-alpha@sourceware.org Subject: [PATCH] Linux: Call dl_hwcap_check earlier, before full auxiliary vector parse Date: Mon, 17 Jun 2024 15:56:33 +0200 Message-ID: <8734pb4qr2.fsf@oldenburg.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-9.5 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, RCVD_IN_SBL_CSS, SPF_HELO_NONE, SPF_NONE, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org The full parsing routine may need the memset function, which could require non-baseline ISA support. --- sysdeps/generic/dl-hwcap-check.h | 5 ++++- sysdeps/powerpc/powerpc64/le/dl-hwcap-check.h | 24 ++++++++++++++++++++---- sysdeps/s390/s390-64/dl-hwcap-check.h | 20 +++++++++++++++++--- sysdeps/unix/sysv/linux/dl-sysdep.c | 20 +++++++++++++------- 4 files changed, 54 insertions(+), 15 deletions(-) base-commit: ca38eff28015f376c020b4dfad5351e45be8d090 diff --git a/sysdeps/generic/dl-hwcap-check.h b/sysdeps/generic/dl-hwcap-check.h index 55efd129be..65dba6d1a0 100644 --- a/sysdeps/generic/dl-hwcap-check.h +++ b/sysdeps/generic/dl-hwcap-check.h @@ -22,7 +22,10 @@ static inline void dl_hwcap_check (void) { - /* The generic implementation does not perform any checks. */ + /* The generic implementation does not perform any checks. Specific + implementations may assume that GLRO(dl_auxv) has been + initialized (if it exists), but GLRO(dl_hwcap), GLRO(dl_hwcap2) + have not been set at this point. */ } #endif /* _DL_HWCAP_CHECK_H */ diff --git a/sysdeps/powerpc/powerpc64/le/dl-hwcap-check.h b/sysdeps/powerpc/powerpc64/le/dl-hwcap-check.h index 6d463f0511..6f8eeb8c47 100644 --- a/sysdeps/powerpc/powerpc64/le/dl-hwcap-check.h +++ b/sysdeps/powerpc/powerpc64/le/dl-hwcap-check.h @@ -25,13 +25,29 @@ static inline void dl_hwcap_check (void) { +#if defined GCCMACRO_ARCH_PWR9 || defined GCCMACRO__FLOAT128_HARDWARE__ \ + || defined GCCMACRO_ARCH_PWR10 || defined GCCMACRO__PCREL__ \ + || defined GCCMACRO__MMA__ + /* Early auxiliary vector parsing, to avoid ISA dependencies in + later full parsing. */ + unsigned long int dl_hwcap2 = 0; + { + for (ElfW(auxv_t) *av = GLRO(dl_auxv); av->a_type != AT_NULL; av++) + if (av->a_type == AT_HWCAP2) + { + dl_hwcap2 = av->a_un.a_val; + break; + } + } +#endif + #ifdef GCCMACRO_ARCH_PWR9 - if ((GLRO (dl_hwcap2) & PPC_FEATURE2_ARCH_3_00) == 0) + if ((dl_hwcap2 & PPC_FEATURE2_ARCH_3_00) == 0) _dl_fatal_printf ("\ Fatal glibc error: CPU lacks ISA 3.00 support (POWER9 or later required)\n"); #endif #ifdef GCCMACRO__FLOAT128_HARDWARE__ - if ((GLRO (dl_hwcap2) & PPC_FEATURE2_HAS_IEEE128) == 0) + if ((dl_hwcap2 & PPC_FEATURE2_HAS_IEEE128) == 0) _dl_fatal_printf ("\ Fatal glibc error: CPU lacks float128 support (POWER 9 or later required)\n"); #endif @@ -39,12 +55,12 @@ Fatal glibc error: CPU lacks float128 support (POWER 9 or later required)\n"); running on POWER9 because there are faulting PCREL instructions before this point. */ #if defined GCCMACRO_ARCH_PWR10 || defined GCCMACRO__PCREL__ - if ((GLRO (dl_hwcap2) & PPC_FEATURE2_ARCH_3_1) == 0) + if ((dl_hwcap2 & PPC_FEATURE2_ARCH_3_1) == 0) _dl_fatal_printf ("\ Fatal glibc error: CPU lacks ISA 3.10 support (POWER10 or later required)\n"); #endif #ifdef GCCMACRO__MMA__ - if ((GLRO (dl_hwcap2) & PPC_FEATURE2_MMA) == 0) + if ((dl_hwcap2 & PPC_FEATURE2_MMA) == 0) _dl_fatal_printf ("\ Fatal glibc error: CPU lacks MMA support (POWER10 or later required)\n"); #endif diff --git a/sysdeps/s390/s390-64/dl-hwcap-check.h b/sysdeps/s390/s390-64/dl-hwcap-check.h index 6ad3242cc9..ee67ebf76e 100644 --- a/sysdeps/s390/s390-64/dl-hwcap-check.h +++ b/sysdeps/s390/s390-64/dl-hwcap-check.h @@ -26,16 +26,30 @@ static inline void dl_hwcap_check (void) { #if defined __ARCH__ +# if GCCMACRO__ARCH__ >= 12 + /* Early auxiliary vector parsing, to avoid ISA dependencies in + later full parsing. */ + unsigned long int dl_hwcap = 0; + { + for (ElfW(auxv_t) *av = GLRO(dl_auxv); av->a_type != AT_NULL; av++) + if (av->a_type == AT_HWCAP) + { + dl_hwcap = av->a_un.a_val; + break; + } + } +# endif + # if GCCMACRO__ARCH__ >= 14 - if (!(GLRO(dl_hwcap) & HWCAP_S390_VXRS_PDE2)) + if (!(dl_hwcap & HWCAP_S390_VXRS_PDE2)) _dl_fatal_printf ("\ Fatal glibc error: CPU lacks VXRS_PDE2 support (z16 or later required)\n"); # elif GCCMACRO__ARCH__ >= 13 - if (!(GLRO(dl_hwcap) & HWCAP_S390_VXRS_EXT2)) + if (!(dl_hwcap & HWCAP_S390_VXRS_EXT2)) _dl_fatal_printf ("\ Fatal glibc error: CPU lacks VXRS_EXT2 support (z15 or later required)\n"); # elif GCCMACRO__ARCH__ >= 12 - if (!(GLRO(dl_hwcap) & HWCAP_S390_VXE)) + if (!(dl_hwcap & HWCAP_S390_VXE)) _dl_fatal_printf ("\ Fatal glibc error: CPU lacks VXE support (z14 or later required)\n"); # endif diff --git a/sysdeps/unix/sysv/linux/dl-sysdep.c b/sysdeps/unix/sysv/linux/dl-sysdep.c index e1b14e9eb3..c54100c8a5 100644 --- a/sysdeps/unix/sysv/linux/dl-sysdep.c +++ b/sysdeps/unix/sysv/linux/dl-sysdep.c @@ -70,11 +70,10 @@ struct dl_main_arguments ElfW(Addr) user_entry; }; -/* Separate function, so that dl_main can be called without the large - array on the stack. */ +/* First part of argument parsing, up to and including GLRO(dl_auxv) + initialization. */ static void -_dl_sysdep_parse_arguments (void **start_argptr, - struct dl_main_arguments *args) +_dl_sysdep_parse_arguments_1 (void **start_argptr) { _dl_argc = (intptr_t) *start_argptr; _dl_argv = (char **) (start_argptr + 1); /* Necessary aliasing violation. */ @@ -86,7 +85,13 @@ _dl_sysdep_parse_arguments (void **start_argptr, GLRO(dl_auxv) = (ElfW(auxv_t) *) (tmp + 1); break; } +} +/* Separate function, so that dl_main can be called without the large + array on the stack. */ +static void __attribute__ ((noinline)) +_dl_sysdep_parse_arguments_2 (struct dl_main_arguments *args) +{ dl_parse_auxv_t auxv_values = { 0, }; _dl_parse_auxv (GLRO(dl_auxv), auxv_values); @@ -102,11 +107,12 @@ _dl_sysdep_start (void **start_argptr, { __libc_stack_end = DL_STACK_END (start_argptr); - struct dl_main_arguments dl_main_args; - _dl_sysdep_parse_arguments (start_argptr, &dl_main_args); - + _dl_sysdep_parse_arguments_1 (start_argptr); dl_hwcap_check (); + struct dl_main_arguments dl_main_args; + _dl_sysdep_parse_arguments_2 (&dl_main_args); + __tunables_init (_environ); /* Initialize DSO sorting algorithm after tunables. */