2 * linux/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.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * This file contains various random system calls that
12 * have a non-standard calling sequence on the Linux/arm
15 #include <linux/module.h>
16 #include <linux/errno.h>
17 #include <linux/sched.h>
18 #include <linux/slab.h>
20 #include <linux/sem.h>
21 #include <linux/msg.h>
22 #include <linux/shm.h>
23 #include <linux/stat.h>
24 #include <linux/syscalls.h>
25 #include <linux/mman.h>
27 #include <linux/file.h>
28 #include <linux/utsname.h>
30 #include <asm/uaccess.h>
33 extern unsigned long do_mremap(unsigned long addr, unsigned long old_len,
34 unsigned long new_len, unsigned long flags,
35 unsigned long new_addr);
38 * sys_pipe() is the normal C calling standard for creating
39 * a pipe. It's not the way unix traditionally does this, though.
41 asmlinkage int sys_pipe(unsigned long __user *fildes)
48 if (copy_to_user(fildes, fd, 2*sizeof(int)))
54 /* common code for old and new mmaps */
56 unsigned long addr, unsigned long len,
57 unsigned long prot, unsigned long flags,
58 unsigned long fd, unsigned long pgoff)
61 struct file * file = NULL;
63 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
65 if (flags & MAP_FIXED && addr < FIRST_USER_ADDRESS)
69 if (!(flags & MAP_ANONYMOUS)) {
75 down_write(¤t->mm->mmap_sem);
76 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
77 up_write(¤t->mm->mmap_sem);
85 struct mmap_arg_struct {
94 asmlinkage int old_mmap(struct mmap_arg_struct __user *arg)
97 struct mmap_arg_struct a;
99 if (copy_from_user(&a, arg, sizeof(a)))
103 if (a.offset & ~PAGE_MASK)
106 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
111 asmlinkage unsigned long
112 sys_arm_mremap(unsigned long addr, unsigned long old_len,
113 unsigned long new_len, unsigned long flags,
114 unsigned long new_addr)
116 unsigned long ret = -EINVAL;
118 if (flags & MREMAP_FIXED && new_addr < FIRST_USER_ADDRESS)
121 down_write(¤t->mm->mmap_sem);
122 ret = do_mremap(addr, old_len, new_len, flags, new_addr);
123 up_write(¤t->mm->mmap_sem);
130 * Perform the select(nd, in, out, ex, tv) and mmap() system
134 struct sel_arg_struct {
136 fd_set __user *inp, *outp, *exp;
137 struct timeval __user *tvp;
140 asmlinkage int old_select(struct sel_arg_struct __user *arg)
142 struct sel_arg_struct a;
144 if (copy_from_user(&a, arg, sizeof(a)))
146 /* sys_select() does the appropriate kernel locking */
147 return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
150 #if !defined(CONFIG_AEABI) || defined(CONFIG_OABI_COMPAT)
152 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
154 * This is really horribly ugly.
156 asmlinkage int sys_ipc(uint call, int first, int second, int third,
157 void __user *ptr, long fifth)
161 version = call >> 16; /* hack for backward compatibility */
166 return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
168 return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
169 (const struct timespec __user *)fifth);
172 return sys_semget (first, second, third);
177 if (get_user(fourth.__pad, (void __user * __user *) ptr))
179 return sys_semctl (first, second, third, fourth);
183 return sys_msgsnd(first, (struct msgbuf __user *) ptr,
188 struct ipc_kludge tmp;
191 if (copy_from_user(&tmp,(struct ipc_kludge __user *)ptr,
194 return sys_msgrcv (first, tmp.msgp, second,
198 return sys_msgrcv (first,
199 (struct msgbuf __user *) ptr,
200 second, fifth, third);
203 return sys_msgget ((key_t) first, second);
205 return sys_msgctl(first, second, (struct msqid_ds __user *)ptr);
211 ret = do_shmat(first, (char __user *)ptr, second, &raddr);
214 return put_user(raddr, (ulong __user *)third);
216 case 1: /* Of course, we don't support iBCS2! */
220 return sys_shmdt ((char __user *)ptr);
222 return sys_shmget (first, second, third);
224 return sys_shmctl (first, second,
225 (struct shmid_ds __user *) ptr);
232 /* Fork a new task - this creates a new program thread.
233 * This is called indirectly via a small wrapper
235 asmlinkage int sys_fork(struct pt_regs *regs)
238 return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
240 /* can not support in nommu mode */
245 /* Clone a task - this clones the calling program thread.
246 * This is called indirectly via a small wrapper
248 asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
249 int __user *parent_tidptr, int tls_val,
250 int __user *child_tidptr, struct pt_regs *regs)
253 newsp = regs->ARM_sp;
255 return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
258 asmlinkage int sys_vfork(struct pt_regs *regs)
260 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
263 /* sys_execve() executes a new program.
264 * This is called indirectly via a small wrapper
266 asmlinkage int sys_execve(char __user *filenamei, char __user * __user *argv,
267 char __user * __user *envp, struct pt_regs *regs)
272 filename = getname(filenamei);
273 error = PTR_ERR(filename);
274 if (IS_ERR(filename))
276 error = do_execve(filename, argv, envp, regs);
282 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
287 memset(®s, 0, sizeof(struct pt_regs));
288 ret = do_execve((char *)filename, (char __user * __user *)argv,
289 (char __user * __user *)envp, ®s);
294 * Save argc to the register structure for userspace.
299 * We were successful. We won't be returning to our caller, but
300 * instead to user space by manipulating the kernel stack.
302 asm( "add r0, %0, %1\n\t"
305 "bl memmove\n\t" /* copy regs to top of stack */
306 "mov r8, #0\n\t" /* not a syscall */
307 "mov r9, %0\n\t" /* thread structure */
308 "mov sp, r0\n\t" /* reposition stack pointer */
311 : "r" (current_thread_info()),
312 "Ir" (THREAD_START_SP - sizeof(regs)),
315 : "r0", "r1", "r2", "r3", "ip", "lr", "memory");
320 EXPORT_SYMBOL(kernel_execve);
323 * Since loff_t is a 64 bit type we avoid a lot of ABI hastle
324 * with a different argument ordering.
326 asmlinkage long sys_arm_fadvise64_64(int fd, int advice,
327 loff_t offset, loff_t len)
329 return sys_fadvise64_64(fd, offset, len, advice);
333 * Yet more syscall fsckage - we can't fit sys_sync_file_range's
334 * arguments into the available registers with EABI. So, let's
335 * create an ARM specific syscall for this which has _sane_
336 * arguments. (This incidentally also has an ABI-independent
339 asmlinkage long sys_arm_sync_file_range(int fd, unsigned int flags,
340 loff_t offset, loff_t nbytes)
342 return sys_sync_file_range(fd, offset, nbytes, flags);