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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 11082 invoked by uid 89); 6 Mar 2020 18:31:04 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-21.1 required=5.0 tests=AWL, BAYES_00, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, KAM_SHORT, KAM_STOCKGEN autolearn=ham version=3.3.1 spammy= X-HELO: smtprelay-out1.synopsys.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=synopsys.com; s=mail; t=1583519070; bh=DQ7Wp8SF/Yprpmt1Qbl/218IapMHdSTTFFCI4epvKtI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DyIytZ/mH8htRMfzmglil3i/3KByko4oZ8JOw8nPPpNnoQ/FtzGHwcLhJ3VTXrqkj FoHQakgE4AU6lGx91BH/4kzPvxB/pyl+BuwDkNkLBc48WdLk3Saz/SQFl+fZvde0fA UAbEzIpd8CvL6ow2ybSucaeYmUqUedbf/D+0h3MrS9aO0oE1QfNpq1A26EK+4YfVc5 p4t/w5NesP40aIM1J+oFcluClrc1tO4NGgfEXSsv5JsF9ECnZWD3NBSO2VIlQPKcXV yhKdwRin8MO+g4RIwJV5c8Wy4kk2HK69QCKUX5ShuRd9TjW0YLOiLfN/qWsNtkUdgu EUWqkQiyV97Bw== From: Vineet Gupta To: libc-alpha@sourceware.org Cc: linux-snps-arc@lists.infradead.org, Vineet Gupta Subject: [PATCH v3 11/17] ARC: Linux Startup and Dynamic Loading Date: Fri, 6 Mar 2020 10:24:13 -0800 Message-Id: <20200306182419.13945-12-vgupta@synopsys.com> In-Reply-To: <20200306182419.13945-1-vgupta@synopsys.com> References: <20200306182419.13945-1-vgupta@synopsys.com> MIME-Version: 1.0 Signed-off-by: Vineet Gupta --- sysdeps/arc/start.S | 15 +++-- sysdeps/unix/sysv/linux/arc/dl-static.c | 84 +++++++++++++++++++++++++ sysdeps/unix/sysv/linux/arc/ldsodefs.h | 32 ++++++++++ 3 files changed, 125 insertions(+), 6 deletions(-) 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/arc/start.S b/sysdeps/arc/start.S index e006453dcd1f..25e43d71da9e 100644 --- a/sysdeps/arc/start.S +++ b/sysdeps/arc/start.S @@ -18,6 +18,8 @@ #define __ASSEMBLY__ 1 #include +#include + #ifndef ENTRY_POINT # error ENTRY_POINT needs to be defined for ARC #endif @@ -31,11 +33,12 @@ env[0...N] environment variables (pointers) NULL. */ - .text - .align 4 - .global __start - .type __start,@function -__start: +ENTRY (ENTRY_POINT) + + /* Needed to make gdb backtraces stop here. */ + .cfi_label .Ldummy + cfi_undefined (blink) + mov fp, 0 ld_s r1, [sp] ; argc @@ -60,7 +63,7 @@ __start: /* Should never get here. */ flag 1 - .size __start,.-__start +END (ENTRY_POINT) /* Define a symbol for the first piece of initialized data. */ .data 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..24c31b27fc11 --- /dev/null +++ b/sysdeps/unix/sysv/linux/arc/dl-static.c @@ -0,0 +1,84 @@ +/* Variable initialization. ARC version. + Copyright (C) 2001-2020 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..9eef836168be --- /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) 2001-2020 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 */