From patchwork Wed May 12 16:57:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florian Weimer X-Patchwork-Id: 43396 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 4845C393C036; Wed, 12 May 2021 16:57:34 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 4845C393C036 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1620838654; bh=MJm4aMhSM/2+1gSFC9qRoWTQ5Ojmw9u+jtpA7nqLt3s=; h=To:Subject:In-Reply-To:References:Date:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=wYyRh3gjUyq0rrz1FG5ylLz4nOyBvCpvQ29EIyQwOndGv69SNe6XabpGaDhZ+7Q5P Pr2KiYQLL49y5MACHw5AnxqzACmk1K7jRlbCrGXSgiqiRzCNiONNGlMSMAkSUqno8g 0V7ilSHOCq+iFv3YaOCXcRkpxZmSaoSK3l7262mE= 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 450783894413 for ; Wed, 12 May 2021 16:57:31 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 450783894413 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-367-gCd8Sas9PdqqNsI2wLiQyg-1; Wed, 12 May 2021 12:57:29 -0400 X-MC-Unique: gCd8Sas9PdqqNsI2wLiQyg-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 2A0F4801817 for ; Wed, 12 May 2021 16:57:28 +0000 (UTC) Received: from oldenburg.str.redhat.com (ovpn-112-137.ams2.redhat.com [10.36.112.137]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 4E9F519D7C for ; Wed, 12 May 2021 16:57:27 +0000 (UTC) To: libc-alpha@sourceware.org Subject: [PATCH 01/23] nptl: Move __nptl_initial_report_events into ld.so/startup code In-Reply-To: References: X-From-Line: 29cf4df8950a06184aa510fec6f2ac1333fd5c0d Mon Sep 17 00:00:00 2001 Message-Id: <29cf4df8950a06184aa510fec6f2ac1333fd5c0d.1620838411.git.fweimer@redhat.com> Date: Wed, 12 May 2021 18:57:25 +0200 User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-12.8 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 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@sourceware.org Sender: "Libc-alpha" The initialization of the report_events TCB field is now performed in __tls_init_tp instead of __pthread_initialize_minimal_internal (in libpthread). The events interface is difficult to test becaue GDB stopped using it in 2015. The td_thr_get_info change to ingore lookup issues is enough to support GDB with this change. Reviewed-by: Adhemerval Zanella --- nptl/Versions | 1 + nptl/nptl-init.c | 12 ------------ nptl/pthreadP.h | 5 +++++ nptl_db/db_info.c | 3 --- nptl_db/structs.def | 2 +- nptl_db/td_thr_get_info.c | 11 +++++++++-- sysdeps/nptl/dl-tls_init_tp.c | 8 ++++++++ 7 files changed, 24 insertions(+), 18 deletions(-) diff --git a/nptl/Versions b/nptl/Versions index 1dd3fbc18c..fb3379b788 100644 --- a/nptl/Versions +++ b/nptl/Versions @@ -497,6 +497,7 @@ libpthread { ld { GLIBC_PRIVATE { + __nptl_initial_report_events; __nptl_set_robust_list_avail; } } \ No newline at end of file diff --git a/nptl/nptl-init.c b/nptl/nptl-init.c index 16fb66bdf5..f4b86fbfaf 100644 --- a/nptl/nptl-init.c +++ b/nptl/nptl-init.c @@ -96,21 +96,9 @@ sigcancel_handler (int sig, siginfo_t *si, void *ctx) extern void **__libc_dl_error_tsd (void) __attribute__ ((const)); -/* This can be set by the debugger before initialization is complete. */ -static bool __nptl_initial_report_events __attribute_used__; - void __pthread_initialize_minimal_internal (void) { - /* Partial initialization of the TCB already happened in TLS_INIT_TP - and __tls_init_tp. */ - struct pthread *pd = THREAD_SELF; - - /* Before initializing GL (dl_stack_user), the debugger could not - find us and had to set __nptl_initial_report_events. Propagate - its setting. */ - THREAD_SETMEM (pd, report_events, __nptl_initial_report_events); - struct sigaction sa; __sigemptyset (&sa.sa_mask); diff --git a/nptl/pthreadP.h b/nptl/pthreadP.h index 5b844f331a..dc2aece37e 100644 --- a/nptl/pthreadP.h +++ b/nptl/pthreadP.h @@ -328,6 +328,11 @@ extern int __pthread_attr_init (pthread_attr_t *attr); libc_hidden_proto (__pthread_attr_init) extern int __pthread_attr_init_2_0 (pthread_attr_t *attr); +/* Part of the legacy thread events interface (which has been + superseded by PTRACE_O_TRACECLONE). This can be set by the + debugger before initialization is complete. */ +extern bool __nptl_initial_report_events; +rtld_hidden_proto (__nptl_initial_report_events) /* Event handlers for libthread_db interface. */ extern void __nptl_create_event (void); diff --git a/nptl_db/db_info.c b/nptl_db/db_info.c index bed6ed486e..b39aebb78c 100644 --- a/nptl_db/db_info.c +++ b/nptl_db/db_info.c @@ -42,9 +42,6 @@ typedef struct rtld_global rtld_global; typedef struct dtv_slotinfo_list dtv_slotinfo_list; typedef struct dtv_slotinfo dtv_slotinfo; -/* Actually static in nptl/init.c, but we only need it for typeof. */ -extern bool __nptl_initial_report_events; - #define schedparam_sched_priority schedparam.sched_priority #define eventbuf_eventmask eventbuf.eventmask diff --git a/nptl_db/structs.def b/nptl_db/structs.def index 9173e1ab8f..275c12bc7a 100644 --- a/nptl_db/structs.def +++ b/nptl_db/structs.def @@ -80,7 +80,7 @@ DB_FUNCTION (__nptl_death_event) DB_SYMBOL (__nptl_threads_events) DB_MAIN_VARIABLE (__nptl_nthreads) DB_VARIABLE (__nptl_last_event) -DB_VARIABLE (__nptl_initial_report_events) +DB_RTLD_VARIABLE (__nptl_initial_report_events) DB_MAIN_ARRAY_VARIABLE (__pthread_keys) DB_STRUCT (pthread_key_struct) diff --git a/nptl_db/td_thr_get_info.c b/nptl_db/td_thr_get_info.c index 002a22a5be..01af021d2a 100644 --- a/nptl_db/td_thr_get_info.c +++ b/nptl_db/td_thr_get_info.c @@ -41,8 +41,15 @@ td_thr_get_info (const td_thrhandle_t *th, td_thrinfo_t *infop) schedpolicy = SCHED_OTHER; schedprio = 0; tid = 0; - err = DB_GET_VALUE (report_events, th->th_ta_p, - __nptl_initial_report_events, 0); + + /* Ignore errors to obtain the __nptl_initial_report_events + value because GDB no longer uses the events interface, and + other libthread_db consumers hopefully can handle different + libpthread/lds.o load orders. */ + report_events = 0; + (void) DB_GET_VALUE (report_events, th->th_ta_p, + __nptl_initial_report_events, 0); + err = TD_OK; } else { diff --git a/sysdeps/nptl/dl-tls_init_tp.c b/sysdeps/nptl/dl-tls_init_tp.c index f1aaa5aa9d..1f7790297f 100644 --- a/sysdeps/nptl/dl-tls_init_tp.c +++ b/sysdeps/nptl/dl-tls_init_tp.c @@ -27,6 +27,9 @@ bool __nptl_set_robust_list_avail __attribute__ ((nocommon)); rtld_hidden_data_def (__nptl_set_robust_list_avail) #endif +bool __nptl_initial_report_events __attribute__ ((nocommon)); +rtld_hidden_def (__nptl_initial_report_events) + #ifdef SHARED /* Dummy implementation. See __rtld_mutex_init. */ static int @@ -63,6 +66,11 @@ __tls_init_tp (void) THREAD_SETMEM (pd, specific[0], &pd->specific_1stblock[0]); THREAD_SETMEM (pd, user_stack, true); + /* Before initializing GL (dl_stack_user), the debugger could not + find us and had to set __nptl_initial_report_events. Propagate + its setting. */ + THREAD_SETMEM (pd, report_events, __nptl_initial_report_events); + /* Initialize the robust mutex data. */ { #if __PTHREAD_MUTEX_HAVE_PREV