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18363b4f01
GCC 10.0 enabled -fno-common by default and this started to point that __cache_line_size had been implemented in 2 different places: loader and libc. In order to avoid this duplication, the libc variable has been removed and the loader variable is moved to rtld_global_ro. File sysdeps/unix/sysv/linux/powerpc/dl-auxv.h has been added in order to reuse code for both static and dynamic linking scenarios. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/* Variable initialization. PowerPC version.
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Copyright (C) 2013-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <ldsodefs.h>
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#ifdef SHARED
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void
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_dl_var_init (void *array[])
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{
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/* It has to match "variables" below. */
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enum
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{
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DL_PAGESIZE = 0,
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DL_AUXV = 1,
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DL_HWCAP = 2,
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DL_HWCAP2 = 3,
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DL_CACHE_LINE_SIZE = 4
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};
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GLRO(dl_pagesize) = *((size_t *) array[DL_PAGESIZE]);
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GLRO(dl_auxv) = (ElfW(auxv_t) *) *((size_t *) array[DL_AUXV]);
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GLRO(dl_hwcap) = *((unsigned long int *) array[DL_HWCAP]);
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GLRO(dl_hwcap2) = *((unsigned long int *) array[DL_HWCAP2]);
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GLRO(dl_cache_line_size) = (int) *((int *) array[DL_CACHE_LINE_SIZE]);
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}
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#else
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static void *variables[] =
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{
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&GLRO(dl_pagesize),
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&GLRO(dl_auxv),
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&GLRO(dl_hwcap),
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&GLRO(dl_hwcap2),
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&GLRO(dl_cache_line_size)
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};
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static void
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_dl_unprotect_relro (struct link_map *l)
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{
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ElfW(Addr) start = ((l->l_addr + l->l_relro_addr)
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& ~(GLRO(dl_pagesize) - 1));
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ElfW(Addr) end = ((l->l_addr + l->l_relro_addr + l->l_relro_size)
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& ~(GLRO(dl_pagesize) - 1));
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if (start != end)
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__mprotect ((void *) start, end - start, PROT_READ | PROT_WRITE);
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}
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void
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_dl_static_init (struct link_map *l)
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{
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struct link_map *rtld_map = l;
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struct r_scope_elem **scope;
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const ElfW(Sym) *ref = NULL;
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lookup_t loadbase;
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void (*f) (void *[]);
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size_t i;
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loadbase = _dl_lookup_symbol_x ("_dl_var_init", l, &ref, l->l_local_scope,
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NULL, 0, 1, NULL);
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for (scope = l->l_local_scope; *scope != NULL; scope++)
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for (i = 0; i < (*scope)->r_nlist; i++)
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if ((*scope)->r_list[i] == loadbase)
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{
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rtld_map = (*scope)->r_list[i];
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break;
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}
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if (ref != NULL)
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{
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f = (void (*) (void *[])) DL_SYMBOL_ADDRESS (loadbase, ref);
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_dl_unprotect_relro (rtld_map);
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f (variables);
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_dl_protect_relro (rtld_map);
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}
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}
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#endif
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