2 * Based on arch/arm/kernel/sys_arm.c
4 * Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c
5 * Copyright (C) 1995, 1996 Russell King.
6 * Copyright (C) 2012 ARM Ltd.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include <linux/compat.h>
22 #include <linux/personality.h>
23 #include <linux/sched.h>
24 #include <linux/slab.h>
25 #include <linux/syscalls.h>
26 #include <linux/uaccess.h>
28 #include <asm/cacheflush.h>
29 #include <asm/unistd32.h>
31 asmlinkage int compat_sys_fork(void)
33 return do_fork(SIGCHLD, 0, current_pt_regs(), 0, NULL, NULL);
36 asmlinkage int compat_sys_vfork(void)
38 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0,
39 current_pt_regs(), 0, NULL, NULL);
43 do_compat_cache_op(unsigned long start, unsigned long end, int flags)
45 struct mm_struct *mm = current->active_mm;
46 struct vm_area_struct *vma;
48 if (end < start || flags)
51 down_read(&mm->mmap_sem);
52 vma = find_vma(mm, start);
53 if (vma && vma->vm_start < end) {
54 if (start < vma->vm_start)
55 start = vma->vm_start;
56 if (end > vma->vm_end)
58 up_read(&mm->mmap_sem);
59 __flush_cache_user_range(start & PAGE_MASK, PAGE_ALIGN(end));
62 up_read(&mm->mmap_sem);
66 * Handle all unrecognised system calls.
68 long compat_arm_syscall(struct pt_regs *regs)
70 unsigned int no = regs->regs[7];
74 * Flush a region from virtual address 'r0' to virtual address 'r1'
75 * _exclusive_. There is no alignment requirement on either address;
76 * user space does not need to know the hardware cache layout.
78 * r2 contains flags. It should ALWAYS be passed as ZERO until it
79 * is defined to be something else. For now we ignore it, but may
80 * the fires of hell burn in your belly if you break this rule. ;)
82 * (at a later date, we may want to allow this call to not flush
83 * various aspects of the cache. Passing '0' will guarantee that
84 * everything necessary gets flushed to maintain consistency in
85 * the specified region).
87 case __ARM_NR_compat_cacheflush:
88 do_compat_cache_op(regs->regs[0], regs->regs[1], regs->regs[2]);
91 case __ARM_NR_compat_set_tls:
92 current->thread.tp_value = regs->regs[0];
93 asm ("msr tpidrro_el0, %0" : : "r" (regs->regs[0]));