From patchwork Fri Nov 29 21:03:23 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella X-Patchwork-Id: 1202596 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org (client-ip=209.132.180.131; helo=sourceware.org; envelope-from=libc-alpha-return-107560-incoming=patchwork.ozlabs.org@sourceware.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; secure) header.d=sourceware.org header.i=@sourceware.org header.b="dM69hqYN"; dkim=pass (2048-bit key; unprotected) header.d=linaro.org header.i=@linaro.org header.b="ncborhC5"; dkim-atps=neutral Received: from sourceware.org (server1.sourceware.org [209.132.180.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 47Pn770l8Zz9sPT for ; Sat, 30 Nov 2019 08:04:02 +1100 (AEDT) DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:from:to:subject:date:message-id:in-reply-to :references; q=dns; s=default; b=rOR0if0sqgoDZJZ4k7W0S/vtY2IkgnM OsfI13OPQNgI9rPziPU48taO5xHl6L82oy50ihjKFLNowMpG6si5GB2kRUyUIXoM +YFPGLPPgCueQpiE6aAt/mzc7jHAdNnCynWGa1s/v2b6uLTWiTN0H+3B++aGg880 9NR7rzsfpG0M= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:from:to:subject:date:message-id:in-reply-to :references; s=default; bh=b8xzT2il0Vuz9LoW9kT/+FRr8o0=; b=dM69h qYNtmPK/nfpWeBkiQkTSR+6v7i15l8w+fJ285iGApcrDlI8JSrjhgU1Pgxj4F+0y gP3F8ph18uhXDMUpB6SQ3T53/NKVNVBDXwXxXSS0UwozR15smVYUmONAbs9BIIUs GbYa8EJFkb3GNlwf1ig/bPwFjVSGvesOFn9T74= Received: (qmail 72005 invoked by alias); 29 Nov 2019 21:03:41 -0000 Mailing-List: contact libc-alpha-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: libc-alpha-owner@sourceware.org Delivered-To: mailing list libc-alpha@sourceware.org Received: (qmail 71957 invoked by uid 89); 29 Nov 2019 21:03:41 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-21.6 required=5.0 tests=AWL, BAYES_00, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, RCVD_IN_DNSWL_NONE, SPF_PASS autolearn=ham version=3.3.1 spammy=eof, HX-Spam-Relays-External:209.85.222.194, H*RU:209.85.222.194, o X-HELO: mail-qk1-f194.google.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:subject:date:message-id:in-reply-to:references; bh=/PPOy1QeIiEGrmkgdyk5lGihZwQHH2uEiyFV+yKC27I=; b=ncborhC5LzBHo82lah5hwlTH+ggf78TGRbu3CHDneDynhdO0QFW5qzmDhFNR6Cu702 2tTGYKBeyC1KRgjF6HgXA76b688x4Eoo3c/pin1eTtQL+XZqLIR+Lu7v4wEvAm4USAM8 rVUJwCkOiBOSo7a/6jGRZBNZMTdw+kPsjHi7NzL8ewF5/X6bv2dbrbp2fVRXtaFQnoba 2zUmGGdvHoEerLTgDWZvZ1vZxPUX01o2EBu3nkUhc3yhxMcl3ti8wUNmZ/6O5+ADBw19 Jbs7+ByJ3w0Uf8eGLVLWWYU72+CdOl16w8ItGbJYBhMc48B6AdPLpZ/STijT7CoYNhUk P4Aw== From: Adhemerval Zanella To: libc-alpha@sourceware.org Subject: [PATCH 3/7] Remove vDSO support from make-syscall.sh Date: Fri, 29 Nov 2019 18:03:23 -0300 Message-Id: <20191129210327.26434-3-adhemerval.zanella@linaro.org> In-Reply-To: <20191129210327.26434-1-adhemerval.zanella@linaro.org> References: <20191129210327.26434-1-adhemerval.zanella@linaro.org> Currenty there is no usage of the vDSO, itt requires sync the auto-generated C file with current glibc implementation, it still uses still uses symbol redirections hacks where libc-symbols.h provide macros (for instance libc_ifunc_redirected), and it does not handle all required compiler handling (inhibit_stack_protector on resolver for instance). Checked with a build against all major ABIs. --- sysdeps/unix/make-syscalls.sh | 45 +---------------------------------- 1 file changed, 1 insertion(+), 44 deletions(-) diff --git a/sysdeps/unix/make-syscalls.sh b/sysdeps/unix/make-syscalls.sh index fe24bbc78f..c07626677f 100644 --- a/sysdeps/unix/make-syscalls.sh +++ b/sysdeps/unix/make-syscalls.sh @@ -149,14 +149,6 @@ emit_weak_aliases() echo "$calls" | while read file srcfile caller syscall args strong weak; do - vdso_syscall= - case x"$syscall" in - *:*@*) - vdso_syscall="${syscall#*:}" - syscall="${syscall%:*}" - ;; - esac - case x"$syscall" in x-) callnum=_ ;; *) @@ -233,10 +225,9 @@ while read file srcfile caller syscall args strong weak; do if test $shared_only = t; then # The versioned symbols are only in the shared library. echo "shared-only-routines += $file" - test -n "$vdso_syscall" || echo "\$(objpfx)${file}.os: \\" + echo "\$(objpfx)${file}.os: \\" else object_suffixes='$(object-suffixes)' - test -z "$vdso_syscall" || object_suffixes='$(object-suffixes-noshared)' echo "\ \$(foreach p,\$(sysd-rules-targets),\ \$(foreach o,${object_suffixes},\$(objpfx)\$(patsubst %,\$p,$file)\$o)): \\" @@ -268,40 +259,6 @@ while read file srcfile caller syscall args strong weak; do echo ' ) | $(compile-syscall) '"\ \$(foreach p,\$(patsubst %$file,%,\$(basename \$(@F))),\$(\$(p)CPPFLAGS))" - if test -n "$vdso_syscall"; then - # In the shared library, we're going to emit an IFUNC using a vDSO function. - # $vdso_syscall looks like "name@KERNEL_X.Y" where "name" is the symbol - # name in the vDSO and KERNEL_X.Y is its symbol version. - vdso_symbol="${vdso_syscall%@*}" - vdso_symver="${vdso_syscall#*@}" - vdso_symver=`echo "$vdso_symver" | sed 's/\./_/g'` - cat <'; \\ - echo '#undef ${strong}'; \\ - echo '#define vdso_ifunc_init()'; \\ - echo '__ifunc (__redirect_${strong}, ${strong},'; \\ - echo ' get_vdso_symbol ("${vdso_symbol}"), void,'; \\ - echo ' vdso_ifunc_init)'; \\ -EOF - # This is doing "hidden_def (${strong})", but the compiler - # doesn't know that we've defined ${strong} in the same file, so - # we can't do it the normal way. - cat <