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/ipc.h>
29 #include <linux/uaccess.h>
31 struct mmap_arg_struct {
40 asmlinkage int old_mmap(struct mmap_arg_struct __user *arg)
43 struct mmap_arg_struct a;
45 if (copy_from_user(&a, arg, sizeof(a)))
49 if (a.offset & ~PAGE_MASK)
52 error = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
57 #if !defined(CONFIG_AEABI) || defined(CONFIG_OABI_COMPAT)
59 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
61 * This is really horribly ugly.
63 asmlinkage int sys_ipc(uint call, int first, int second, int third,
64 void __user *ptr, long fifth)
68 version = call >> 16; /* hack for backward compatibility */
73 return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
75 return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
76 (const struct timespec __user *)fifth);
79 return sys_semget (first, second, third);
84 if (get_user(fourth.__pad, (void __user * __user *) ptr))
86 return sys_semctl (first, second, third, fourth);
90 return sys_msgsnd(first, (struct msgbuf __user *) ptr,
95 struct ipc_kludge tmp;
98 if (copy_from_user(&tmp,(struct ipc_kludge __user *)ptr,
101 return sys_msgrcv (first, tmp.msgp, second,
105 return sys_msgrcv (first,
106 (struct msgbuf __user *) ptr,
107 second, fifth, third);
110 return sys_msgget ((key_t) first, second);
112 return sys_msgctl(first, second, (struct msqid_ds __user *)ptr);
118 ret = do_shmat(first, (char __user *)ptr, second, &raddr);
121 return put_user(raddr, (ulong __user *)third);
123 case 1: /* Of course, we don't support iBCS2! */
127 return sys_shmdt ((char __user *)ptr);
129 return sys_shmget (first, second, third);
131 return sys_shmctl (first, second,
132 (struct shmid_ds __user *) ptr);
139 /* Fork a new task - this creates a new program thread.
140 * This is called indirectly via a small wrapper
142 asmlinkage int sys_fork(struct pt_regs *regs)
145 return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
147 /* can not support in nommu mode */
152 /* Clone a task - this clones the calling program thread.
153 * This is called indirectly via a small wrapper
155 asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
156 int __user *parent_tidptr, int tls_val,
157 int __user *child_tidptr, struct pt_regs *regs)
160 newsp = regs->ARM_sp;
162 return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
165 asmlinkage int sys_vfork(struct pt_regs *regs)
167 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
170 /* sys_execve() executes a new program.
171 * This is called indirectly via a small wrapper
173 asmlinkage int sys_execve(char __user *filenamei, char __user * __user *argv,
174 char __user * __user *envp, struct pt_regs *regs)
179 filename = getname(filenamei);
180 error = PTR_ERR(filename);
181 if (IS_ERR(filename))
183 error = do_execve(filename, argv, envp, regs);
189 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
194 memset(®s, 0, sizeof(struct pt_regs));
195 ret = do_execve((char *)filename, (char __user * __user *)argv,
196 (char __user * __user *)envp, ®s);
201 * Save argc to the register structure for userspace.
206 * We were successful. We won't be returning to our caller, but
207 * instead to user space by manipulating the kernel stack.
209 asm( "add r0, %0, %1\n\t"
212 "bl memmove\n\t" /* copy regs to top of stack */
213 "mov r8, #0\n\t" /* not a syscall */
214 "mov r9, %0\n\t" /* thread structure */
215 "mov sp, r0\n\t" /* reposition stack pointer */
218 : "r" (current_thread_info()),
219 "Ir" (THREAD_START_SP - sizeof(regs)),
222 : "r0", "r1", "r2", "r3", "ip", "lr", "memory");
227 EXPORT_SYMBOL(kernel_execve);
230 * Since loff_t is a 64 bit type we avoid a lot of ABI hassle
231 * with a different argument ordering.
233 asmlinkage long sys_arm_fadvise64_64(int fd, int advice,
234 loff_t offset, loff_t len)
236 return sys_fadvise64_64(fd, offset, len, advice);