From patchwork Fri Jul 10 23:38:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vineet Gupta X-Patchwork-Id: 40029 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 D2CF63875410; Fri, 10 Jul 2020 23:38:22 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org D2CF63875410 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1594424302; bh=bzBMa4pL01N9oiSAoWrqEiLIa+SR3slacca6MnzY3MQ=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc: From; b=KkAXQ5iIptKUh4ABMFH/GMXf+jS8hG6HwbkdOCBwrda/tWzZE/sPCpS1n0yXYD+Zl Djoo+DNs430YUkmjzmCjfULeXNX9P/OJusICtuHP0HBC4SxE+9Vo6VRnmAUlqZqnE3 SzTaS9XkZIwDvdvPre29L8cd7tCC9OBFulImNlYg= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from smtprelay-out1.synopsys.com (smtprelay-out1.synopsys.com [149.117.73.133]) by sourceware.org (Postfix) with ESMTPS id F0AF9383E837 for ; Fri, 10 Jul 2020 23:38:16 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org F0AF9383E837 Received: from mailhost.synopsys.com (sv2-mailhost2.synopsys.com [10.205.2.134]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by smtprelay-out1.synopsys.com (Postfix) with ESMTPS id 2AEEF40A3A; Fri, 10 Jul 2020 23:38:16 +0000 (UTC) Received: from vineetg-Latitude-7400.internal.synopsys.com (unknown [10.13.183.89]) by mailhost.synopsys.com (Postfix) with ESMTP id E9842A005A; Fri, 10 Jul 2020 23:38:15 +0000 (UTC) X-SNPS-Relay: synopsys.com To: libc-alpha@sourceware.org Subject: [COMMITTED 09/13] ARC: Linux Startup and Dynamic Loading Date: Fri, 10 Jul 2020 16:38:06 -0700 Message-Id: <20200710233810.18720-9-vgupta@synopsys.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200710233810.18720-1-vgupta@synopsys.com> References: <20200710233810.18720-1-vgupta@synopsys.com> MIME-Version: 1.0 X-Spam-Status: No, score=-13.0 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, KAM_STOCKGEN, 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: Vineet Gupta via Libc-alpha From: Vineet Gupta Reply-To: Vineet Gupta Cc: Vineet Gupta , linux-snps-arc@lists.infradead.org Errors-To: libc-alpha-bounces@sourceware.org Sender: "Libc-alpha" A big shoutout to Cupertino Miranda for his valuable contribution in initial bringup and debugging on Linux and later in solving pesky unwinding/cancelation failures in testsuite. Reviewed-by: Adhemerval Zanella --- sysdeps/unix/sysv/linux/arc/dl-static.c | 84 +++++++++++++++++++++++++ sysdeps/unix/sysv/linux/arc/ldsodefs.h | 32 ++++++++++ 2 files changed, 116 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/arc/dl-static.c create mode 100644 sysdeps/unix/sysv/linux/arc/ldsodefs.h diff --git a/sysdeps/unix/sysv/linux/arc/dl-static.c b/sysdeps/unix/sysv/linux/arc/dl-static.c new file mode 100644 index 000000000000..30bcd899d42d --- /dev/null +++ b/sysdeps/unix/sysv/linux/arc/dl-static.c @@ -0,0 +1,84 @@ +/* Variable initialization. ARC version. + Copyright (C) 2020 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library. If not, see + . */ + +#include + +#ifdef SHARED + +void +_dl_var_init (void *array[]) +{ + /* It has to match "variables" below. */ + enum + { + DL_PAGESIZE = 0 + }; + + GLRO(dl_pagesize) = *((size_t *) array[DL_PAGESIZE]); +} + +#else + +static void *variables[] = +{ + &GLRO(dl_pagesize) +}; + +static void +_dl_unprotect_relro (struct link_map *l) +{ + ElfW(Addr) start = ((l->l_addr + l->l_relro_addr) + & ~(GLRO(dl_pagesize) - 1)); + ElfW(Addr) end = ((l->l_addr + l->l_relro_addr + l->l_relro_size) + & ~(GLRO(dl_pagesize) - 1)); + + if (start != end) + __mprotect ((void *) start, end - start, PROT_READ | PROT_WRITE); +} + +void +_dl_static_init (struct link_map *l) +{ + struct link_map *rtld_map = l; + struct r_scope_elem **scope; + const ElfW(Sym) *ref = NULL; + lookup_t loadbase; + void (*f) (void *[]); + size_t i; + + loadbase = _dl_lookup_symbol_x ("_dl_var_init", l, &ref, l->l_local_scope, + NULL, 0, 1, NULL); + + for (scope = l->l_local_scope; *scope != NULL; scope++) + for (i = 0; i < (*scope)->r_nlist; i++) + if ((*scope)->r_list[i] == loadbase) + { + rtld_map = (*scope)->r_list[i]; + break; + } + + if (ref != NULL) + { + f = (void (*) (void *[])) DL_SYMBOL_ADDRESS (loadbase, ref); + _dl_unprotect_relro (rtld_map); + f (variables); + _dl_protect_relro (rtld_map); + } +} + +#endif diff --git a/sysdeps/unix/sysv/linux/arc/ldsodefs.h b/sysdeps/unix/sysv/linux/arc/ldsodefs.h new file mode 100644 index 000000000000..204a0ff8946c --- /dev/null +++ b/sysdeps/unix/sysv/linux/arc/ldsodefs.h @@ -0,0 +1,32 @@ +/* Run-time dynamic linker data structures for loaded ELF shared objects. ARC + Copyright (C) 2020 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#ifndef _LDSODEFS_H + +/* Get the real definitions. */ +#include_next + +/* Now define our stuff. */ + +/* We need special support to initialize DSO loaded for statically linked + binaries. */ +extern void _dl_static_init (struct link_map *map); +#undef DL_STATIC_INIT +#define DL_STATIC_INIT(map) _dl_static_init (map) + +#endif /* ldsodefs.h */