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(struct pt_regs *regs)
33 return do_fork(SIGCHLD, regs->compat_sp, regs, 0, NULL, NULL);
36 asmlinkage int compat_sys_clone(unsigned long clone_flags, unsigned long newsp,
37 int __user *parent_tidptr, int tls_val,
38 int __user *child_tidptr, struct pt_regs *regs)
41 newsp = regs->compat_sp;
43 return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
46 asmlinkage int compat_sys_vfork(struct pt_regs *regs)
48 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->compat_sp,
52 asmlinkage int compat_sys_execve(const char __user *filenamei,
53 compat_uptr_t argv, compat_uptr_t envp,
57 struct filename *filename;
59 filename = getname(filenamei);
60 error = PTR_ERR(filename);
63 error = compat_do_execve(filename->name, compat_ptr(argv),
64 compat_ptr(envp), regs);
70 asmlinkage int compat_sys_sched_rr_get_interval(compat_pid_t pid,
71 struct compat_timespec __user *interval)
75 mm_segment_t old_fs = get_fs();
78 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
80 if (put_compat_timespec(&t, interval))
86 do_compat_cache_op(unsigned long start, unsigned long end, int flags)
88 struct mm_struct *mm = current->active_mm;
89 struct vm_area_struct *vma;
91 if (end < start || flags)
94 down_read(&mm->mmap_sem);
95 vma = find_vma(mm, start);
96 if (vma && vma->vm_start < end) {
97 if (start < vma->vm_start)
98 start = vma->vm_start;
99 if (end > vma->vm_end)
101 up_read(&mm->mmap_sem);
102 __flush_cache_user_range(start & PAGE_MASK, PAGE_ALIGN(end));
105 up_read(&mm->mmap_sem);
109 * Handle all unrecognised system calls.
111 long compat_arm_syscall(struct pt_regs *regs)
113 unsigned int no = regs->regs[7];
117 * Flush a region from virtual address 'r0' to virtual address 'r1'
118 * _exclusive_. There is no alignment requirement on either address;
119 * user space does not need to know the hardware cache layout.
121 * r2 contains flags. It should ALWAYS be passed as ZERO until it
122 * is defined to be something else. For now we ignore it, but may
123 * the fires of hell burn in your belly if you break this rule. ;)
125 * (at a later date, we may want to allow this call to not flush
126 * various aspects of the cache. Passing '0' will guarantee that
127 * everything necessary gets flushed to maintain consistency in
128 * the specified region).
130 case __ARM_NR_compat_cacheflush:
131 do_compat_cache_op(regs->regs[0], regs->regs[1], regs->regs[2]);
134 case __ARM_NR_compat_set_tls:
135 current->thread.tp_value = regs->regs[0];
136 asm ("msr tpidrro_el0, %0" : : "r" (regs->regs[0]));