From patchwork Wed Dec 27 06:05:32 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Palmer Dabbelt X-Patchwork-Id: 853071 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=sourceware.org (client-ip=209.132.180.131; helo=sourceware.org; envelope-from=libc-alpha-return-88628-incoming=patchwork.ozlabs.org@sourceware.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; secure) header.d=sourceware.org header.i=@sourceware.org header.b="TkGSbmpZ"; 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 3z62Vm5kfnz9s7h for ; Wed, 27 Dec 2017 17:09:20 +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:subject:date:message-id:in-reply-to:references :cc:from:to; q=dns; s=default; b=ZJDq1qMmZMhUg7FScm5CXkAErGYXBYO 4dTESzNtddHwfkzQXXmQaGMJu6YXOd1pFsRoEPZYVBasQROpqdDu6EVDVIBl5iZ8 7F094ak68niGGzfbHnkRgWN/Wmqtl+AvtmUMtXPQY1sIyONTTXVHaNTk5zqL2tT/ uLov9n3rUWaM= 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:subject:date:message-id:in-reply-to:references :cc:from:to; s=default; bh=iN1fcXbkFA7OTvbkuo+v+3c8fvo=; b=TkGSb mpZeMRUe5imZdzMHhr6vRKyf5XhyzjDP5lYxJXncaTAYwXeF20pHwNB3WJd3EMV3 VweujN5vjEv/2StQJvh1mzYg9HnnGDiPrI97h1wo8+cPd5XhoqZU8ilEeXtFM40D 7GJY5w0CLgiLPs9euMO7GBW1i0/N0vjNGG/7Ds= Received: (qmail 62395 invoked by alias); 27 Dec 2017 06:06:24 -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 62325 invoked by uid 89); 27 Dec 2017 06:06:24 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-25.1 required=5.0 tests=AWL, 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: mail-pf0-f193.google.com X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:date:message-id:in-reply-to:references :cc:from:to; bh=JfC6eRMTN7dVWtR1SBqMKcwFSi/GIbjsyg+8tUGiJpg=; b=JmkofREGbwd0wqNoCBTQmkZ3/jp2dZ2nnmd7iPoWHKD5nG+3Nxra/9+jCP9IzoJwR4 TCI0yq8TgyQNZi2U/KglcZeuLcWwqK8cRX3hGX+ZL2ni/f/lFQBfdlkDBSoNcy+8xNyk VfimKH+O8j+w8hoQumIeTxM2tIxnlWv5M5bWL5kX/0RAEAayc3llglxmui6z3hVkqlFH Ji9aCTQHHIsontEfYMYNtpp5EYzm3q7uWcJCU4ciOMhzR8NZyK9R0miqe01K6fEQ2V5l GyH3OzxDvpkwcYhyGr8rzaGwjrxGukNbtL54wN3Wc13yZxEpQ4inbkmKlQ4vsaxr1U0l x/IA== X-Gm-Message-State: AKGB3mIUjgOPxG2Uan/QmwZ6wU+TrdYQZ/X4dGJEnpQ139+1VjrJSaSK ehEIXeNkLMIkuWwyFqPvHQuMRw== X-Google-Smtp-Source: ACJfBouYkoyUm2JxD1hhT8UtnokQowlgmq2vD7bQMqJ7TOvG1a1KVEj+YlNwUpo+kAB9JwhLvJxiAQ== X-Received: by 10.98.153.221 with SMTP id t90mr27368347pfk.210.1514354779980; Tue, 26 Dec 2017 22:06:19 -0800 (PST) Subject: [PATCH v3 17/19] RISC-V: Linux Startup and Dynamic Loading Code Date: Tue, 26 Dec 2017 22:05:32 -0800 Message-Id: <20171227060534.3998-18-palmer@dabbelt.com> In-Reply-To: <20171227060534.3998-1-palmer@dabbelt.com> References: <20171227060534.3998-1-palmer@dabbelt.com> Cc: patches@groups.riscv.org, Palmer Dabbelt From: Palmer Dabbelt To: libc-alpha@sourceware.org This contains the Linux-specific code for loading programs on RISC-V. --- sysdeps/unix/sysv/linux/riscv/dl-static.c | 84 +++++++++++++++++++++++++++++++ sysdeps/unix/sysv/linux/riscv/ldconfig.h | 37 ++++++++++++++ sysdeps/unix/sysv/linux/riscv/ldsodefs.h | 32 ++++++++++++ 3 files changed, 153 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/riscv/dl-static.c create mode 100644 sysdeps/unix/sysv/linux/riscv/ldconfig.h create mode 100644 sysdeps/unix/sysv/linux/riscv/ldsodefs.h diff --git a/sysdeps/unix/sysv/linux/riscv/dl-static.c b/sysdeps/unix/sysv/linux/riscv/dl-static.c new file mode 100644 index 000000000000..e5572d1fffe2 --- /dev/null +++ b/sysdeps/unix/sysv/linux/riscv/dl-static.c @@ -0,0 +1,84 @@ +/* Variable initialization. RISC-V version + Copyright (C) 2001-2017 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/riscv/ldconfig.h b/sysdeps/unix/sysv/linux/riscv/ldconfig.h new file mode 100644 index 000000000000..de1f2a8ad811 --- /dev/null +++ b/sysdeps/unix/sysv/linux/riscv/ldconfig.h @@ -0,0 +1,37 @@ +/* ldconfig default paths and libraries. Linux/RISC-V version. + Copyright (C) 2001-2017 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 + +#define LD_SO_PREFIX "/lib/ld-linux-" +#define LD_SO_SUFFIX ".so.1" + +#if __riscv_xlen == 64 +# define LD_SO_ABI "riscv64-lp64" +#else +# define LD_SO_ABI "riscv32-ilp32" +#endif + +#define SYSDEP_KNOWN_INTERPRETER_NAMES \ + { LD_SO_PREFIX LD_SO_ABI "d" LD_SO_SUFFIX, FLAG_ELF_LIBC6 }, \ + { LD_SO_PREFIX LD_SO_ABI "f" LD_SO_SUFFIX, FLAG_ELF_LIBC6 }, \ + { LD_SO_PREFIX LD_SO_ABI LD_SO_SUFFIX, FLAG_ELF_LIBC6 }, + +#define SYSDEP_KNOWN_LIBRARY_NAMES \ + { "libc.so.6", FLAG_ELF_LIBC6 }, \ + { "libm.so.6", FLAG_ELF_LIBC6 }, diff --git a/sysdeps/unix/sysv/linux/riscv/ldsodefs.h b/sysdeps/unix/sysv/linux/riscv/ldsodefs.h new file mode 100644 index 000000000000..314de0b201d5 --- /dev/null +++ b/sysdeps/unix/sysv/linux/riscv/ldsodefs.h @@ -0,0 +1,32 @@ +/* RISC-V dynamic linker data structures for loaded ELF shared objects. + Copyright (C) 2001-2017 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 */