diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/hexagon/kernel/vdso.c')
-rw-r--r-- | ANDROID_3.4.5/arch/hexagon/kernel/vdso.c | 100 |
1 files changed, 0 insertions, 100 deletions
diff --git a/ANDROID_3.4.5/arch/hexagon/kernel/vdso.c b/ANDROID_3.4.5/arch/hexagon/kernel/vdso.c deleted file mode 100644 index 5d39f42f..00000000 --- a/ANDROID_3.4.5/arch/hexagon/kernel/vdso.c +++ /dev/null @@ -1,100 +0,0 @@ -/* - * vDSO implementation for Hexagon - * - * Copyright (c) 2011, Code Aurora Forum. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 and - * only version 2 as published by the Free Software Foundation. - * - * This program 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 General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA. - */ - -#include <linux/err.h> -#include <linux/mm.h> -#include <linux/vmalloc.h> -#include <linux/binfmts.h> - -#include <asm/vdso.h> - -static struct page *vdso_page; - -/* Create a vDSO page holding the signal trampoline. - * We want this for a non-executable stack. - */ -static int __init vdso_init(void) -{ - struct hexagon_vdso *vdso; - - vdso_page = alloc_page(GFP_KERNEL); - if (!vdso_page) - panic("Cannot allocate vdso"); - - vdso = vmap(&vdso_page, 1, 0, PAGE_KERNEL); - if (!vdso) - panic("Cannot map vdso"); - clear_page(vdso); - - /* Install the signal trampoline; currently looks like this: - * r6 = #__NR_rt_sigreturn; - * trap0(#1); - */ - vdso->rt_signal_trampoline[0] = __rt_sigtramp_template[0]; - vdso->rt_signal_trampoline[1] = __rt_sigtramp_template[1]; - - vunmap(vdso); - - return 0; -} -arch_initcall(vdso_init); - -/* - * Called from binfmt_elf. Create a VMA for the vDSO page. - */ -int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) -{ - int ret; - unsigned long vdso_base; - struct mm_struct *mm = current->mm; - - down_write(&mm->mmap_sem); - - /* Try to get it loaded right near ld.so/glibc. */ - vdso_base = STACK_TOP; - - vdso_base = get_unmapped_area(NULL, vdso_base, PAGE_SIZE, 0, 0); - if (IS_ERR_VALUE(vdso_base)) { - ret = vdso_base; - goto up_fail; - } - - /* MAYWRITE to allow gdb to COW and set breakpoints. */ - ret = install_special_mapping(mm, vdso_base, PAGE_SIZE, - VM_READ|VM_EXEC| - VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC, - &vdso_page); - - if (ret) - goto up_fail; - - mm->context.vdso = (void *)vdso_base; - -up_fail: - up_write(&mm->mmap_sem); - return ret; -} - -const char *arch_vma_name(struct vm_area_struct *vma) -{ - if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) - return "[vdso]"; - return NULL; -} |