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[AArch64] Use _dl_static_init to set GLR0(dl_pagesize)
This commit is contained in:
Marcus Shawcroft
parent
c61f8513f7
commit
8ab07407ba
@ -1,3 +1,11 @@
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2013-07-09 Marcus Shawcroft <marcus.shawcroft@linaro.org>
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* sysdeps/unix/sysv/linux/aarch64/dl-static.c: New file to support
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variable page size for AArch64.
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* sysdeps/unix/sysv/linux/aarch64/ldsodefs.h: Likewise.
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* sysdeps/unix/sysv/linux/aarch64/Makefile: Build dl-static in elf.
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* sysdeps/unix/sysv/linux/aarch64/Versions: Add _dl_var_init.
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2013-07-05 Marcus Shawcroft <marcus.shawcroft@linaro.org>
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* sysdeps/aarch64/libm-test-ulps: Regenerate.
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@ -7,6 +7,12 @@ endif
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ifeq ($(subdir),elf)
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sysdep_routines += dl-vdso
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sysdep-rtld-routines += __read_tp
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ifeq ($(build-shared),yes)
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# This is needed for DSO loading from static binaries.
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sysdep-dl-routines += dl-static
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sysdep_routines += dl-static
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sysdep-rtld-routines += dl-static
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endif
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endif
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ifeq ($(subdir),misc)
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@ -1,3 +1,9 @@
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ld {
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GLIBC_PRIVATE {
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# used for loading by static libraries
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_dl_var_init;
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}
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}
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libc {
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GLIBC_PRIVATE {
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__vdso_clock_gettime;
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84
ports/sysdeps/unix/sysv/linux/aarch64/dl-static.c
Normal file
84
ports/sysdeps/unix/sysv/linux/aarch64/dl-static.c
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@ -0,0 +1,84 @@
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/* Variable initialization. AArch64 version.
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Copyright (C) 2001-2013 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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<http://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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};
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GLRO(dl_pagesize) = *((size_t *) array[DL_PAGESIZE]);
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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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};
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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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32
ports/sysdeps/unix/sysv/linux/aarch64/ldsodefs.h
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32
ports/sysdeps/unix/sysv/linux/aarch64/ldsodefs.h
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@ -0,0 +1,32 @@
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/* Run-time dynamic linker data structures for loaded ELF shared objects. Tile.
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Copyright (C) 2001-2013 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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<http://www.gnu.org/licenses/>. */
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#ifndef _LDSODEFS_H
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/* Get the real definitions. */
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#include_next <ldsodefs.h>
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/* Now define our stuff. */
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/* We need special support to initialize DSO loaded for statically linked
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binaries. */
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extern void _dl_static_init (struct link_map *map);
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#undef DL_STATIC_INIT
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#define DL_STATIC_INIT(map) _dl_static_init (map)
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#endif /* ldsodefs.h */
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