mirror of https://gitee.com/openkylin/linux.git
344 lines
8.2 KiB
C
344 lines
8.2 KiB
C
/*
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* linux/arch/arm/kernel/sys_arm.c
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*
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* Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c
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* Copyright (C) 1995, 1996 Russell King.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This file contains various random system calls that
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* have a non-standard calling sequence on the Linux/arm
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* platform.
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/stat.h>
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#include <linux/syscalls.h>
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#include <linux/mman.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/utsname.h>
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#include <asm/uaccess.h>
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#include <asm/ipc.h>
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extern unsigned long do_mremap(unsigned long addr, unsigned long old_len,
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unsigned long new_len, unsigned long flags,
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unsigned long new_addr);
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/*
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* sys_pipe() is the normal C calling standard for creating
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* a pipe. It's not the way unix traditionally does this, though.
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*/
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asmlinkage int sys_pipe(unsigned long __user *fildes)
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{
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int fd[2];
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int error;
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error = do_pipe(fd);
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if (!error) {
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if (copy_to_user(fildes, fd, 2*sizeof(int)))
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error = -EFAULT;
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}
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return error;
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}
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/* common code for old and new mmaps */
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inline long do_mmap2(
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unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, unsigned long pgoff)
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{
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int error = -EINVAL;
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struct file * file = NULL;
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flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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if (flags & MAP_FIXED && addr < FIRST_USER_ADDRESS)
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goto out;
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error = -EBADF;
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if (!(flags & MAP_ANONYMOUS)) {
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file = fget(fd);
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if (!file)
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goto out;
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}
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down_write(¤t->mm->mmap_sem);
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error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
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up_write(¤t->mm->mmap_sem);
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if (file)
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fput(file);
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out:
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return error;
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}
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struct mmap_arg_struct {
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unsigned long addr;
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unsigned long len;
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unsigned long prot;
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unsigned long flags;
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unsigned long fd;
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unsigned long offset;
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};
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asmlinkage int old_mmap(struct mmap_arg_struct __user *arg)
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{
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int error = -EFAULT;
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struct mmap_arg_struct a;
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if (copy_from_user(&a, arg, sizeof(a)))
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goto out;
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error = -EINVAL;
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if (a.offset & ~PAGE_MASK)
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goto out;
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error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
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out:
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return error;
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}
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asmlinkage unsigned long
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sys_arm_mremap(unsigned long addr, unsigned long old_len,
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unsigned long new_len, unsigned long flags,
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unsigned long new_addr)
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{
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unsigned long ret = -EINVAL;
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if (flags & MREMAP_FIXED && new_addr < FIRST_USER_ADDRESS)
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goto out;
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down_write(¤t->mm->mmap_sem);
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ret = do_mremap(addr, old_len, new_len, flags, new_addr);
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up_write(¤t->mm->mmap_sem);
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out:
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return ret;
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}
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/*
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* Perform the select(nd, in, out, ex, tv) and mmap() system
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* calls.
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*/
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struct sel_arg_struct {
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unsigned long n;
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fd_set __user *inp, *outp, *exp;
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struct timeval __user *tvp;
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};
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asmlinkage int old_select(struct sel_arg_struct __user *arg)
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{
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struct sel_arg_struct a;
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if (copy_from_user(&a, arg, sizeof(a)))
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return -EFAULT;
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/* sys_select() does the appropriate kernel locking */
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return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
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}
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#if !defined(CONFIG_AEABI) || defined(CONFIG_OABI_COMPAT)
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/*
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* sys_ipc() is the de-multiplexer for the SysV IPC calls..
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*
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* This is really horribly ugly.
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*/
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asmlinkage int sys_ipc(uint call, int first, int second, int third,
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void __user *ptr, long fifth)
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{
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int version, ret;
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version = call >> 16; /* hack for backward compatibility */
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call &= 0xffff;
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switch (call) {
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case SEMOP:
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return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
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case SEMTIMEDOP:
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return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
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(const struct timespec __user *)fifth);
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case SEMGET:
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return sys_semget (first, second, third);
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case SEMCTL: {
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union semun fourth;
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if (!ptr)
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return -EINVAL;
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if (get_user(fourth.__pad, (void __user * __user *) ptr))
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return -EFAULT;
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return sys_semctl (first, second, third, fourth);
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}
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case MSGSND:
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return sys_msgsnd(first, (struct msgbuf __user *) ptr,
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second, third);
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case MSGRCV:
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switch (version) {
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case 0: {
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struct ipc_kludge tmp;
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if (!ptr)
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return -EINVAL;
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if (copy_from_user(&tmp,(struct ipc_kludge __user *)ptr,
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sizeof (tmp)))
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return -EFAULT;
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return sys_msgrcv (first, tmp.msgp, second,
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tmp.msgtyp, third);
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}
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default:
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return sys_msgrcv (first,
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(struct msgbuf __user *) ptr,
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second, fifth, third);
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}
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case MSGGET:
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return sys_msgget ((key_t) first, second);
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case MSGCTL:
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return sys_msgctl(first, second, (struct msqid_ds __user *)ptr);
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case SHMAT:
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switch (version) {
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default: {
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ulong raddr;
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ret = do_shmat(first, (char __user *)ptr, second, &raddr);
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if (ret)
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return ret;
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return put_user(raddr, (ulong __user *)third);
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}
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case 1: /* Of course, we don't support iBCS2! */
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return -EINVAL;
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}
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case SHMDT:
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return sys_shmdt ((char __user *)ptr);
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case SHMGET:
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return sys_shmget (first, second, third);
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case SHMCTL:
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return sys_shmctl (first, second,
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(struct shmid_ds __user *) ptr);
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default:
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return -ENOSYS;
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}
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}
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#endif
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/* Fork a new task - this creates a new program thread.
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* This is called indirectly via a small wrapper
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*/
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asmlinkage int sys_fork(struct pt_regs *regs)
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{
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#ifdef CONFIG_MMU
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return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
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#else
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/* can not support in nommu mode */
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return(-EINVAL);
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#endif
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}
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/* Clone a task - this clones the calling program thread.
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* This is called indirectly via a small wrapper
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*/
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asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
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int __user *parent_tidptr, int tls_val,
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int __user *child_tidptr, struct pt_regs *regs)
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{
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if (!newsp)
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newsp = regs->ARM_sp;
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return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
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}
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asmlinkage int sys_vfork(struct pt_regs *regs)
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{
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return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
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}
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/* sys_execve() executes a new program.
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* This is called indirectly via a small wrapper
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*/
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asmlinkage int sys_execve(char __user *filenamei, char __user * __user *argv,
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char __user * __user *envp, struct pt_regs *regs)
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{
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int error;
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char * filename;
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filename = getname(filenamei);
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error = PTR_ERR(filename);
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if (IS_ERR(filename))
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goto out;
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error = do_execve(filename, argv, envp, regs);
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putname(filename);
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out:
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return error;
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}
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int kernel_execve(const char *filename, char *const argv[], char *const envp[])
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{
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struct pt_regs regs;
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int ret;
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memset(®s, 0, sizeof(struct pt_regs));
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ret = do_execve((char *)filename, (char __user * __user *)argv,
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(char __user * __user *)envp, ®s);
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if (ret < 0)
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goto out;
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/*
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* Save argc to the register structure for userspace.
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*/
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regs.ARM_r0 = ret;
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/*
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* We were successful. We won't be returning to our caller, but
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* instead to user space by manipulating the kernel stack.
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*/
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asm( "add r0, %0, %1\n\t"
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"mov r1, %2\n\t"
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"mov r2, %3\n\t"
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"bl memmove\n\t" /* copy regs to top of stack */
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"mov r8, #0\n\t" /* not a syscall */
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"mov r9, %0\n\t" /* thread structure */
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"mov sp, r0\n\t" /* reposition stack pointer */
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"b ret_to_user"
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:
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: "r" (current_thread_info()),
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"Ir" (THREAD_START_SP - sizeof(regs)),
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"r" (®s),
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"Ir" (sizeof(regs))
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: "r0", "r1", "r2", "r3", "ip", "lr", "memory");
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out:
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return ret;
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}
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EXPORT_SYMBOL(kernel_execve);
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/*
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* Since loff_t is a 64 bit type we avoid a lot of ABI hastle
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* with a different argument ordering.
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*/
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asmlinkage long sys_arm_fadvise64_64(int fd, int advice,
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loff_t offset, loff_t len)
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{
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return sys_fadvise64_64(fd, offset, len, advice);
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}
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/*
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* Yet more syscall fsckage - we can't fit sys_sync_file_range's
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* arguments into the available registers with EABI. So, let's
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* create an ARM specific syscall for this which has _sane_
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* arguments. (This incidentally also has an ABI-independent
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* argument layout.)
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*/
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asmlinkage long sys_arm_sync_file_range(int fd, unsigned int flags,
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loff_t offset, loff_t nbytes)
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{
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return sys_sync_file_range(fd, offset, nbytes, flags);
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}
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