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author | Marcus Shawcroft <marcus.shawcroft@linaro.org> | 2013-07-05 17:13:35 +0100 |
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committer | Marcus Shawcroft <marcus.shawcroft@linaro.org> | 2013-07-09 15:07:12 +0100 |
commit | 8ab07407ba4857e0d565288f786a53360b17466b (patch) | |
tree | c6f7ed36dd02ff409a4a2619fb54cb52214628fe /ports/sysdeps/unix/sysv/linux/aarch64/dl-static.c | |
parent | c61f8513f7392e512faab89b758093c6e61a890c (diff) | |
download | glibc-8ab07407ba4857e0d565288f786a53360b17466b.tar.gz glibc-8ab07407ba4857e0d565288f786a53360b17466b.tar.xz glibc-8ab07407ba4857e0d565288f786a53360b17466b.zip |
[AArch64] Use _dl_static_init to set GLR0(dl_pagesize)
Diffstat (limited to 'ports/sysdeps/unix/sysv/linux/aarch64/dl-static.c')
-rw-r--r-- | ports/sysdeps/unix/sysv/linux/aarch64/dl-static.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/aarch64/dl-static.c b/ports/sysdeps/unix/sysv/linux/aarch64/dl-static.c new file mode 100644 index 0000000000..13b48e9332 --- /dev/null +++ b/ports/sysdeps/unix/sysv/linux/aarch64/dl-static.c @@ -0,0 +1,84 @@ +/* Variable initialization. AArch64 version. + Copyright (C) 2001-2013 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 + <http://www.gnu.org/licenses/>. */ + +#include <ldsodefs.h> + +#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 |