From patchwork Fri Jan 26 05:44:40 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Palmer Dabbelt X-Patchwork-Id: 25558 Received: (qmail 8917 invoked by alias); 26 Jan 2018 05:45:35 -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 8616 invoked by uid 89); 26 Jan 2018 05:45:30 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-24.7 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-pg0-f66.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=WsgZ1PbbbEz7r6/FpoMFZHlPfZRr1nKQ5x36++xPl+I=; b=kWxDqSPSXFJ9p/bdi09eQRVq2/nRZ/uKdjvYAjnahNDkfUiZWu2rdFQQdJ/rpkErCE jyMZh3NxuiiY5d3vsnUc8OULg6Rf6S5Yb9DsMR9P5SUVSJaf9q1pvJYJhg3BMkdddkz/ rMQ6DijoLkNKPwLw2LiPi+x9pC5UTUuAec0U554Xn5JYd783EfXS4R84ztZ8xHIEeJkO ejPn+j6KyUFBSaO8BA+1CWuY4eRk0v4tXDUiNOsss0/EV1F/2+aQ4lQNDqzPlOXDWCAs Kd9/RQpEkboxwftKqRtqe7vDktJLyhTxmJf5K0JngaQNJ9hoCU9YR111rMyqcM/xWyr6 1CFQ== X-Gm-Message-State: AKwxytfqBPp1ROKjynMnTEpS1zF/ybefEVcEsH6apaoFkzm8VbXU3lyA wiiykkLX+FN4qxyWMIklYJgPd8SI88Q= X-Google-Smtp-Source: AH8x226kLM58CyUWUS7/zeo7xL/i5kLu+3S1uEnIu+vEJWc2c7ohrOgGRYt4P3Itw+V1dlPUOwIr5Q== X-Received: by 2002:a17:902:66e6:: with SMTP id e93-v6mr13212541plk.173.1516945512793; Thu, 25 Jan 2018 21:45:12 -0800 (PST) Subject: [PATCH v6 13/16] RISC-V: Linux Startup and Dynamic Loading Code Date: Thu, 25 Jan 2018 21:44:40 -0800 Message-Id: <20180126054443.22702-14-palmer@dabbelt.com> In-Reply-To: <20180126054443.22702-1-palmer@dabbelt.com> References: <20180126054443.22702-1-palmer@dabbelt.com> Cc: patches@groups.riscv.org, Andrew Waterman , dj@redhat.com, Darius Rad , Palmer Dabbelt From: Palmer Dabbelt To: libc-alpha@sourceware.org, joseph@codesourcery.com 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 | 36 +++++++++++++ sysdeps/unix/sysv/linux/riscv/ldsodefs.h | 32 ++++++++++++ 3 files changed, 152 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..f88512a8a954 --- /dev/null +++ b/sysdeps/unix/sysv/linux/riscv/dl-static.c @@ -0,0 +1,84 @@ +/* Variable initialization. RISC-V version + Copyright (C) 2001-2018 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..0ca798a870f1 --- /dev/null +++ b/sysdeps/unix/sysv/linux/riscv/ldconfig.h @@ -0,0 +1,36 @@ +/* ldconfig default paths and libraries. Linux/RISC-V version. + Copyright (C) 2001-2018 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 +# error "rv32i-based targets are not supported" +#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 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..b9421ffdfa21 --- /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) 2001-2018 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 */