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/errno.h>
16 #include <linux/sched.h>
17 #include <linux/slab.h>
19 #include <linux/sem.h>
20 #include <linux/msg.h>
21 #include <linux/shm.h>
22 #include <linux/stat.h>
23 #include <linux/mman.h>
25 #include <linux/file.h>
26 #include <linux/utsname.h>
28 #include <asm/uaccess.h>
31 extern unsigned long do_mremap(unsigned long addr, unsigned long old_len,
32 unsigned long new_len, unsigned long flags,
33 unsigned long new_addr);
36 * sys_pipe() is the normal C calling standard for creating
37 * a pipe. It's not the way unix traditionally does this, though.
39 asmlinkage int sys_pipe(unsigned long * fildes)
46 if (copy_to_user(fildes, fd, 2*sizeof(int)))
52 /* common code for old and new mmaps */
54 unsigned long addr, unsigned long len,
55 unsigned long prot, unsigned long flags,
56 unsigned long fd, unsigned long pgoff)
59 struct file * file = NULL;
61 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
64 * If we are doing a fixed mapping, and address < PAGE_SIZE,
67 if (flags & MAP_FIXED && addr < PAGE_SIZE && vectors_base() == 0)
71 if (!(flags & MAP_ANONYMOUS)) {
77 down_write(¤t->mm->mmap_sem);
78 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
79 up_write(¤t->mm->mmap_sem);
87 struct mmap_arg_struct {
96 asmlinkage int old_mmap(struct mmap_arg_struct *arg)
99 struct mmap_arg_struct a;
101 if (copy_from_user(&a, arg, sizeof(a)))
105 if (a.offset & ~PAGE_MASK)
108 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
113 asmlinkage unsigned long
114 sys_arm_mremap(unsigned long addr, unsigned long old_len,
115 unsigned long new_len, unsigned long flags,
116 unsigned long new_addr)
118 unsigned long ret = -EINVAL;
121 * If we are doing a fixed mapping, and address < PAGE_SIZE,
124 if (flags & MREMAP_FIXED && new_addr < PAGE_SIZE &&
128 down_write(¤t->mm->mmap_sem);
129 ret = do_mremap(addr, old_len, new_len, flags, new_addr);
130 up_write(¤t->mm->mmap_sem);
137 * Perform the select(nd, in, out, ex, tv) and mmap() system
140 extern asmlinkage int sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
142 struct sel_arg_struct {
144 fd_set *inp, *outp, *exp;
148 asmlinkage int old_select(struct sel_arg_struct *arg)
150 struct sel_arg_struct a;
152 if (copy_from_user(&a, arg, sizeof(a)))
154 /* sys_select() does the appropriate kernel locking */
155 return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
159 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
161 * This is really horribly ugly.
163 asmlinkage int sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
167 version = call >> 16; /* hack for backward compatibility */
172 return sys_semop (first, (struct sembuf *)ptr, second);
174 return sys_semget (first, second, third);
179 if (get_user(fourth.__pad, (void **) ptr))
181 return sys_semctl (first, second, third, fourth);
185 return sys_msgsnd (first, (struct msgbuf *) ptr,
190 struct ipc_kludge tmp;
193 if (copy_from_user(&tmp,(struct ipc_kludge *) ptr,
196 return sys_msgrcv (first, tmp.msgp, second,
200 return sys_msgrcv (first,
201 (struct msgbuf *) ptr,
202 second, fifth, third);
205 return sys_msgget ((key_t) first, second);
207 return sys_msgctl (first, second, (struct msqid_ds *) ptr);
213 ret = sys_shmat (first, (char *) ptr, second, &raddr);
216 return put_user (raddr, (ulong *) third);
218 case 1: /* iBCS2 emulator entry point */
219 if (!segment_eq(get_fs(), get_ds()))
221 return sys_shmat (first, (char *) ptr,
222 second, (ulong *) third);
225 return sys_shmdt ((char *)ptr);
227 return sys_shmget (first, second, third);
229 return sys_shmctl (first, second,
230 (struct shmid_ds *) ptr);
236 /* Fork a new task - this creates a new program thread.
237 * This is called indirectly via a small wrapper
239 asmlinkage int sys_fork(struct pt_regs *regs)
241 return do_fork(SIGCHLD, regs->ARM_sp, regs, 0);
244 /* Clone a task - this clones the calling program thread.
245 * This is called indirectly via a small wrapper
247 asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, struct pt_regs *regs)
250 newsp = regs->ARM_sp;
251 return do_fork(clone_flags, newsp, regs, 0);
254 asmlinkage int sys_vfork(struct pt_regs *regs)
256 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0);
259 /* sys_execve() executes a new program.
260 * This is called indirectly via a small wrapper
262 asmlinkage int sys_execve(char *filenamei, char **argv, char **envp, struct pt_regs *regs)
267 filename = getname(filenamei);
268 error = PTR_ERR(filename);
269 if (IS_ERR(filename))
271 error = do_execve(filename, argv, envp, regs);
277 asmlinkage int sys_pause(void)
279 current->state = TASK_INTERRUPTIBLE;
281 return -ERESTARTNOHAND;