From patchwork Wed Jun 14 18:30:48 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Palmer Dabbelt X-Patchwork-Id: 21020 Received: (qmail 99144 invoked by alias); 14 Jun 2017 18:33:23 -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 99044 invoked by uid 89); 14 Jun 2017 18:33:22 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-24.1 required=5.0 tests=AWL, BAYES_00, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, KAM_STOCKGEN, RCVD_IN_DNSWL_NONE, SPF_PASS, UNSUBSCRIBE_BODY autolearn=ham version=3.3.2 spammy= X-HELO: mail-pf0-f178.google.com X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:cc:cc:cc:subject:date:message-id :in-reply-to:references; bh=3fXUoFbP+s1RJIbkuCdUXSzolpRr2BwxgexPFy3szaM=; b=in7kzOSdVIJ3j5EYiNnDzSqC0yydFmf24t4rAMKVyOvbz1y9FsqH0x4NGiVSOzEMN6 hpS3TJZL7UeEzLxZAHnQv3i1ic/L2b1J/GolbffPVjdk0EE+mNeqbTwwh2p4kWYgKSu0 Oz00feckiu3eIf3eaThyJlAVyM5/pqx3+MtHL5xzogZJ0NkGRHR3ShrJd0SH3FTdunMS 0ussNpQDfCEXKRGMVPwhbyfeK3JiacBjN/hJfI+i5LNIjko7KHoxkGDdFbgFQ51aB/R+ Z4cyBNgmR6GXQpEWRBBFjOAV6ZjQdQA93FtRLAEdjXGNPywT369f+GM3RGSW3U5nHs98 cc4w== X-Gm-Message-State: AKS2vOxWyt9TQAuweovHIL6r7zTTFh02TCisU7glQY597VKwfh3WjCfM +Amfm73FrSEidmpOaBtt0Q== X-Received: by 10.84.142.131 with SMTP id 3mr373602plx.33.1497465199203; Wed, 14 Jun 2017 11:33:19 -0700 (PDT) From: Palmer Dabbelt To: libc-alpha@sourceware.org Cc: Andrew Waterman Cc: patches@groups.riscv.org Cc: Darius Rad Cc: Palmer Dabbelt Subject: [PATCH 12/12] RISC-V: Linux Startup and Dynamic Loading Code Date: Wed, 14 Jun 2017 11:30:48 -0700 Message-Id: <20170614183048.11040-13-palmer@dabbelt.com> In-Reply-To: <20170614183048.11040-1-palmer@dabbelt.com> References: <20170614183048.11040-1-palmer@dabbelt.com> This contains the Linux-specific code for loading programs on RISC-V. --- sysdeps/unix/sysv/linux/riscv/dl-static.c | 85 +++++++++++++++++++++++++++++++ sysdeps/unix/sysv/linux/riscv/ldconfig.h | 37 ++++++++++++++ sysdeps/unix/sysv/linux/riscv/ldsodefs.h | 34 +++++++++++++ 3 files changed, 156 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 0000000000..2a6b849c61 --- /dev/null +++ b/sysdeps/unix/sysv/linux/riscv/dl-static.c @@ -0,0 +1,85 @@ +/* Variable initialization. RISC-V version + Copyright (C) 2001-2003, 2005, 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#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 0000000000..4a5d2fbb1c --- /dev/null +++ b/sysdeps/unix/sysv/linux/riscv/ldconfig.h @@ -0,0 +1,37 @@ +/* Copyright (C) 2001, 2002, 2003, 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#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 0000000000..3959603975 --- /dev/null +++ b/sysdeps/unix/sysv/linux/riscv/ldsodefs.h @@ -0,0 +1,34 @@ +/* Run-time dynamic linker data structures for loaded ELF shared objects. + RISC-V + Copyright (C) 2001, 2003, 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#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 */