From patchwork Wed Jan 30 01:25:49 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vineet Gupta X-Patchwork-Id: 31252 Received: (qmail 11249 invoked by alias); 30 Jan 2019 01:28:42 -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 11118 invoked by uid 89); 30 Jan 2019 01:28:40 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-25.4 required=5.0 tests=BAYES_00, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, KAM_SHORT, KAM_STOCKGEN, RCVD_IN_DNSWL_NONE, SPF_PASS autolearn=ham version=3.3.2 spammy= X-HELO: smtprelay.synopsys.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=synopsys.com; s=mail; t=1548811715; bh=QXBcQH0zflWNVN/6GK6SFCH63ulpv/zC8eQlPHhi9GA=; h=From:To:CC:Subject:Date:In-Reply-To:References:From; b=eBUOP3ANMWl8SL3+oTG57JG/1BIutsJh1W9cFqWhL5dlSGxUiP9fj18kGP0ktGlAH CsZEN+IQ9H04bym8rq5xFWP4fQqJ/xaH0RlfIOi1O7kREX/F0IJXzdm5hWob7a6lcm IeP8AYJ9pHNegOlfiO6Uoxnw2LZ4YGUZG9jsCg7hEwngvZCjVYccYJ0nUOAOBo9upk j2+NxDYKizt3sd6ZGvEJC6UNQNvee1Ue3LMMwt+r+4tVgGhnSJSXF0vO6MSUpf4bxS pbYGoCuJwSxvGMI0dJIW9C1JwvSaoa+EUUAJ6EKx/+9VHTwT59diEaj3bqqrTQok86 +z5AHEs/j/lIA== From: Vineet Gupta To: CC: , Vineet Gupta Subject: [PATCH v2 09/15] ARC: Linux Startup and Dynamic Loading Date: Tue, 29 Jan 2019 17:25:49 -0800 Message-ID: <1548811555-24373-10-git-send-email-vgupta@synopsys.com> In-Reply-To: <1548811555-24373-1-git-send-email-vgupta@synopsys.com> References: <1548811555-24373-1-git-send-email-vgupta@synopsys.com> MIME-Version: 1.0 Signed-off-by: Vineet Gupta --- ChangeLog | 2 + sysdeps/unix/sysv/linux/arc/dl-static.c | 84 +++++++++++++++++++++++++++++++++ sysdeps/unix/sysv/linux/arc/ldsodefs.h | 32 +++++++++++++ 3 files changed, 118 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/ChangeLog b/ChangeLog index e0f2c3372e31..017bced57129 100644 --- a/ChangeLog +++ b/ChangeLog @@ -67,6 +67,8 @@ * sysdeps/unix/sysv/linux/arc/sys/user.h: New file. * sysdeps/unix/sysv/linux/arc/ucontext-macros.h: New file. * sysdeps/unix/sysv/linux/arc/ucontext_i.sym: New file. + * sysdeps/unix/sysv/linux/arc/dl-static.c: New file. + * sysdeps/unix/sysv/linux/arc/ldsodefs.h: New file. 2019-01-25 Siddhesh Poyarekar 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..1a8757c9840d --- /dev/null +++ b/sysdeps/unix/sysv/linux/arc/dl-static.c @@ -0,0 +1,84 @@ +/* Variable initialization. ARC version. + Copyright (C) 2001-2019 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..8c5c6800af13 --- /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) 2001-2019 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 */