From patchwork Mon Jun 28 12:41:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florian Weimer X-Patchwork-Id: 44036 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id F03D23982C3A for ; Mon, 28 Jun 2021 12:42:19 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org F03D23982C3A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1624884140; bh=vdj/4q7p8XRXEe0AuzEnGWftY7iFo1wDns2odiBKABY=; h=To:Subject:Date:List-Id:List-Unsubscribe:List-Archive:List-Post: List-Help:List-Subscribe:From:Reply-To:From; b=UzU7/RxrlewpmkLE+4bifihvGzQJGyff/TbvbON1su6JJmaXYV4AAs50cmx1Gp8Kv cWRjBqtBfeZEb+QYXnrWv6nVLrZG1p0B8y8ZjqOf0MaM/k3H1WCm4qQ6Bw6UrQbYA3 H7+stgI+tgiKhhIiJ1Z+3KiNReRBPL29+oc2lSTI= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) by sourceware.org (Postfix) with ESMTP id DA3BF3982C1A for ; Mon, 28 Jun 2021 12:41:57 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org DA3BF3982C1A Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-535-TDcqPTPcOR6CMVqvQ39WOw-1; Mon, 28 Jun 2021 08:41:55 -0400 X-MC-Unique: TDcqPTPcOR6CMVqvQ39WOw-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id ED17D19067E1 for ; Mon, 28 Jun 2021 12:41:53 +0000 (UTC) Received: from oldenburg.str.redhat.com (ovpn-112-228.ams2.redhat.com [10.36.112.228]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E885669CB8; Mon, 28 Jun 2021 12:41:49 +0000 (UTC) To: libc-alpha@sourceware.org Subject: [PATCH v3] nptl: Export libthread_db-used symbols under GLIBC_PRIVATE Date: Mon, 28 Jun 2021 14:41:47 +0200 Message-ID: <87zgvarwj8.fsf@oldenburg.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-12.0 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_LOW, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_PASS, TXREP, URIBL_BLACK autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Florian Weimer via Libc-alpha From: Florian Weimer Reply-To: Florian Weimer Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" This allows distributions to strip debugging information from libc.so.6 without impacting the debugging experience. Reviewed-by: Carlos O'Donell --- nptl/Versions | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++ nptl/pthread_create.c | 13 ++++++----- nptl_db/Makefile | 2 +- nptl_db/db-symbols.awk | 6 ++++-- 4 files changed, 71 insertions(+), 8 deletions(-) diff --git a/nptl/Versions b/nptl/Versions index e4fae73c0b..060d8d5dec 100644 --- a/nptl/Versions +++ b/nptl/Versions @@ -403,10 +403,14 @@ libc { __nptl_deallocate_tsd; __nptl_death_event; __nptl_free_tcb; + __nptl_last_event; __nptl_nthreads; + __nptl_rtld_global; __nptl_setxid_sighandler; __nptl_stack_list_add; __nptl_stack_list_del; + __nptl_threads_events; + __nptl_version; __pthread_attr_copy; __pthread_attr_destroy; __pthread_attr_init; @@ -430,6 +434,60 @@ libc { __pthread_unwind; __sched_fifo_max_prio; __sched_fifo_min_prio; + _thread_db___nptl_last_event; + _thread_db___nptl_nthreads; + _thread_db___nptl_rtld_global; + _thread_db___pthread_keys; + _thread_db_const_thread_area; + _thread_db_dtv_dtv; + _thread_db_dtv_slotinfo_gen; + _thread_db_dtv_slotinfo_list_len; + _thread_db_dtv_slotinfo_list_next; + _thread_db_dtv_slotinfo_list_slotinfo; + _thread_db_dtv_slotinfo_map; + _thread_db_dtv_t_counter; + _thread_db_dtv_t_pointer_val; + _thread_db_link_map_l_tls_modid; + _thread_db_link_map_l_tls_offset; + _thread_db_list_t_next; + _thread_db_list_t_prev; + _thread_db_pthread_cancelhandling; + _thread_db_pthread_dtvp; + _thread_db_pthread_eventbuf; + _thread_db_pthread_eventbuf_eventmask; + _thread_db_pthread_eventbuf_eventmask_event_bits; + _thread_db_pthread_key_data_data; + _thread_db_pthread_key_data_level2_data; + _thread_db_pthread_key_data_seq; + _thread_db_pthread_key_struct_destr; + _thread_db_pthread_key_struct_seq; + _thread_db_pthread_list; + _thread_db_pthread_nextevent; + _thread_db_pthread_report_events; + _thread_db_pthread_schedparam_sched_priority; + _thread_db_pthread_schedpolicy; + _thread_db_pthread_specific; + _thread_db_pthread_start_routine; + _thread_db_pthread_tid; + _thread_db_register32; + _thread_db_register32_thread_area; + _thread_db_register64; + _thread_db_register64_thread_area; + _thread_db_rtld_global__dl_stack_used; + _thread_db_rtld_global__dl_stack_user; + _thread_db_rtld_global__dl_tls_dtv_slotinfo_list; + _thread_db_sizeof_dtv_slotinfo; + _thread_db_sizeof_dtv_slotinfo_list; + _thread_db_sizeof_list_t; + _thread_db_sizeof_pthread; + _thread_db_sizeof_pthread_key_data; + _thread_db_sizeof_pthread_key_data_level2; + _thread_db_sizeof_pthread_key_struct; + _thread_db_sizeof_td_eventbuf_t; + _thread_db_sizeof_td_thr_events_t; + _thread_db_td_eventbuf_t_eventdata; + _thread_db_td_eventbuf_t_eventnum; + _thread_db_td_thr_events_t_event_bits; } } diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c index 3f017f1e26..d1b6817a81 100644 --- a/nptl/pthread_create.c +++ b/nptl/pthread_create.c @@ -43,21 +43,24 @@ /* Globally enabled events. */ -static td_thr_events_t __nptl_threads_events __attribute_used__; +td_thr_events_t __nptl_threads_events __attribute__ ((nocommon)); +libc_hidden_proto (__nptl_threads_events) +libc_hidden_data_def (__nptl_threads_events) /* Pointer to descriptor with the last event. */ -static struct pthread *__nptl_last_event __attribute_used__; +struct pthread *__nptl_last_event __attribute__ ((nocommon)); +libc_hidden_proto (__nptl_last_event) +libc_hidden_data_def (__nptl_last_event) #ifdef SHARED /* This variable is used to access _rtld_global from libthread_db. If GDB loads libpthread before ld.so, it is not possible to resolve _rtld_global directly during libpthread initialization. */ -static struct rtld_global *__nptl_rtld_global __attribute_used__ - = &_rtld_global; +struct rtld_global *__nptl_rtld_global = &_rtld_global; #endif /* Version of the library, used in libthread_db to detect mismatches. */ -static const char nptl_version[] __attribute_used__ = VERSION; +const char __nptl_version[] = VERSION; /* This performs the initialization necessary when going from single-threaded to multi-threaded mode for the first time. */ diff --git a/nptl_db/Makefile b/nptl_db/Makefile index 1f79c018a1..c04aa6140a 100644 --- a/nptl_db/Makefile +++ b/nptl_db/Makefile @@ -55,7 +55,7 @@ include ../Rules $(objpfx)db-symbols.out: $(objpfx)db-symbols.v.i \ $(common-objpfx)libc.so - LC_ALL=C $(READELF) -W -s $(filter %.so,$^) | $(AWK) -f $< > $@; \ + LC_ALL=C $(READELF) -W -D -s $(filter %.so,$^) | $(AWK) -f $< > $@; \ $(evaluate-test) $(objpfx)db-symbols.v.i: db-symbols.awk diff --git a/nptl_db/db-symbols.awk b/nptl_db/db-symbols.awk index ef1d91b167..fe90d3b435 100644 --- a/nptl_db/db-symbols.awk +++ b/nptl_db/db-symbols.awk @@ -1,4 +1,4 @@ -# This script processes the output of 'readelf -W -s' on the libpthread.so +# This script processes the output of 'readelf -W -D -s' on the libc.so # we've just built. It checks for all the symbols used in td_symbol_list. BEGIN { @@ -12,7 +12,7 @@ BEGIN { in_symtab = 0; } -/Symbol table '.symtab'/ { in_symtab=1; next } +/Symbol table for image/ { in_symtab=1; next } NF == 0 { in_symtab=0; next } !in_symtab { next } @@ -23,6 +23,7 @@ END { status = 0; for (s in required) { + s = s "@@GLIBC_PRIVATE" if (s in seen) print s, "ok"; else { status = 1; @@ -32,6 +33,7 @@ END { any = ""; for (s in th_unique) { + s = s "@@GLIBC_PRIVATE" if (s in seen) { any = s; break;