| /* |
| * Based on arch/arm/kernel/sys_arm.c |
| * |
| * Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c |
| * Copyright (C) 1995, 1996 Russell King. |
| * Copyright (C) 2012 ARM Ltd. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License 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, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <linux/compat.h> |
| #include <linux/personality.h> |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/syscalls.h> |
| #include <linux/uaccess.h> |
| |
| #include <asm/cacheflush.h> |
| #include <asm/unistd.h> |
| |
| static inline void |
| do_compat_cache_op(unsigned long start, unsigned long end, int flags) |
| { |
| struct mm_struct *mm = current->active_mm; |
| struct vm_area_struct *vma; |
| |
| if (end < start || flags) |
| return; |
| |
| down_read(&mm->mmap_sem); |
| vma = find_vma(mm, start); |
| if (vma && vma->vm_start < end) { |
| if (start < vma->vm_start) |
| start = vma->vm_start; |
| if (end > vma->vm_end) |
| end = vma->vm_end; |
| up_read(&mm->mmap_sem); |
| __flush_cache_user_range(start & PAGE_MASK, PAGE_ALIGN(end)); |
| return; |
| } |
| up_read(&mm->mmap_sem); |
| } |
| |
| /* |
| * Handle all unrecognised system calls. |
| */ |
| long compat_arm_syscall(struct pt_regs *regs) |
| { |
| unsigned int no = regs->regs[7]; |
| |
| switch (no) { |
| /* |
| * Flush a region from virtual address 'r0' to virtual address 'r1' |
| * _exclusive_. There is no alignment requirement on either address; |
| * user space does not need to know the hardware cache layout. |
| * |
| * r2 contains flags. It should ALWAYS be passed as ZERO until it |
| * is defined to be something else. For now we ignore it, but may |
| * the fires of hell burn in your belly if you break this rule. ;) |
| * |
| * (at a later date, we may want to allow this call to not flush |
| * various aspects of the cache. Passing '0' will guarantee that |
| * everything necessary gets flushed to maintain consistency in |
| * the specified region). |
| */ |
| case __ARM_NR_compat_cacheflush: |
| do_compat_cache_op(regs->regs[0], regs->regs[1], regs->regs[2]); |
| return 0; |
| |
| case __ARM_NR_compat_set_tls: |
| current->thread.tp_value = regs->regs[0]; |
| asm ("msr tpidrro_el0, %0" : : "r" (regs->regs[0])); |
| return 0; |
| |
| default: |
| return -ENOSYS; |
| } |
| } |