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);
66 * If we are doing a fixed mapping, and address < PAGE_SIZE,
69 if (flags & MAP_FIXED && addr < PAGE_SIZE && vectors_base() == 0)
73 if (!(flags & MAP_ANONYMOUS)) {
79 down_write(¤t->mm->mmap_sem);
80 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
81 up_write(¤t->mm->mmap_sem);
89 struct mmap_arg_struct {
98 asmlinkage int old_mmap(struct mmap_arg_struct __user *arg)
101 struct mmap_arg_struct a;
103 if (copy_from_user(&a, arg, sizeof(a)))
107 if (a.offset & ~PAGE_MASK)
110 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
115 asmlinkage unsigned long
116 sys_arm_mremap(unsigned long addr, unsigned long old_len,
117 unsigned long new_len, unsigned long flags,
118 unsigned long new_addr)
120 unsigned long ret = -EINVAL;
123 * If we are doing a fixed mapping, and address < PAGE_SIZE,
126 if (flags & MREMAP_FIXED && new_addr < PAGE_SIZE &&
130 down_write(¤t->mm->mmap_sem);
131 ret = do_mremap(addr, old_len, new_len, flags, new_addr);
132 up_write(¤t->mm->mmap_sem);
139 * Perform the select(nd, in, out, ex, tv) and mmap() system
143 struct sel_arg_struct {
145 fd_set __user *inp, *outp, *exp;
146 struct timeval __user *tvp;
149 asmlinkage int old_select(struct sel_arg_struct __user *arg)
151 struct sel_arg_struct a;
153 if (copy_from_user(&a, arg, sizeof(a)))
155 /* sys_select() does the appropriate kernel locking */
156 return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
160 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
162 * This is really horribly ugly.
164 asmlinkage int sys_ipc(uint call, int first, int second, int third,
165 void __user *ptr, long fifth)
169 version = call >> 16; /* hack for backward compatibility */
174 return sys_semop(first, (struct sembuf __user *)ptr, second);
176 return sys_semget (first, second, third);
181 if (get_user(fourth.__pad, (void __user * __user *) ptr))
183 return sys_semctl (first, second, third, fourth);
187 return sys_msgsnd(first, (struct msgbuf __user *) ptr,
192 struct ipc_kludge tmp;
195 if (copy_from_user(&tmp,(struct ipc_kludge __user *)ptr,
198 return sys_msgrcv (first, tmp.msgp, second,
202 return sys_msgrcv (first,
203 (struct msgbuf __user *) ptr,
204 second, fifth, third);
207 return sys_msgget ((key_t) first, second);
209 return sys_msgctl(first, second, (struct msqid_ds __user *)ptr);
215 ret = do_shmat(first, (char __user *)ptr, second, &raddr);
218 return put_user(raddr, (ulong __user *)third);
220 case 1: /* iBCS2 emulator entry point */
221 if (!segment_eq(get_fs(), get_ds()))
223 return do_shmat(first, (char __user *) ptr,
224 second, (ulong __user *) third);
227 return sys_shmdt ((char __user *)ptr);
229 return sys_shmget (first, second, third);
231 return sys_shmctl (first, second,
232 (struct shmid_ds __user *) ptr);
238 /* Fork a new task - this creates a new program thread.
239 * This is called indirectly via a small wrapper
241 asmlinkage int sys_fork(struct pt_regs *regs)
243 return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
246 /* Clone a task - this clones the calling program thread.
247 * This is called indirectly via a small wrapper
249 asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, struct pt_regs *regs)
252 * We don't support SETTID / CLEARTID
254 if (clone_flags & (CLONE_PARENT_SETTID | CLONE_CHILD_CLEARTID))
258 newsp = regs->ARM_sp;
260 return do_fork(clone_flags & ~CLONE_IDLETASK, newsp, regs, 0, NULL, NULL);
263 asmlinkage int sys_vfork(struct pt_regs *regs)
265 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
268 /* sys_execve() executes a new program.
269 * This is called indirectly via a small wrapper
271 asmlinkage int sys_execve(char __user *filenamei, char __user * __user *argv,
272 char __user * __user *envp, struct pt_regs *regs)
277 filename = getname(filenamei);
278 error = PTR_ERR(filename);
279 if (IS_ERR(filename))
281 error = do_execve(filename, argv, envp, regs);
287 long execve(const char *filename, char **argv, char **envp)
292 memset(®s, 0, sizeof(struct pt_regs));
293 ret = do_execve((char *)filename, (char __user * __user *)argv,
294 (char __user * __user *)envp, ®s);
299 * Save argc to the register structure for userspace.
304 * We were successful. We won't be returning to our caller, but
305 * instead to user space by manipulating the kernel stack.
307 asm( "add r0, %0, %1\n\t"
310 "bl memmove\n\t" /* copy regs to top of stack */
311 "mov r8, #0\n\t" /* not a syscall */
312 "mov r9, %0\n\t" /* thread structure */
313 "mov sp, r0\n\t" /* reposition stack pointer */
316 : "r" (current_thread_info()),
317 "Ir" (THREAD_SIZE - 8 - sizeof(regs)),
320 : "r0", "r1", "r2", "r3", "ip", "memory");
325 EXPORT_SYMBOL(execve);