266 lines
6.2 KiB
C
266 lines
6.2 KiB
C
/*
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* linux/arch/i386/kernel/sys_i386.c
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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/i386
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* platform.
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*/
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.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/file.h>
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#include <linux/utsname.h>
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#include <asm/uaccess.h>
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#include <asm/unistd.h>
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#include <asm/ipc.h>
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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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asmlinkage long sys_mmap2(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 = -EBADF;
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struct file *file = NULL;
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struct mm_struct *mm = current->mm;
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flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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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(&mm->mmap_sem);
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error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
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up_write(&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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/*
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* Perform the select(nd, in, out, ex, tv) and mmap() system
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* calls. Linux/i386 didn't use to be able to handle more than
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* 4 system call parameters, so these system calls used a memory
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* block for parameter passing..
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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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struct mmap_arg_struct a;
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int err = -EFAULT;
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if (copy_from_user(&a, arg, sizeof(a)))
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goto out;
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err = -EINVAL;
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if (a.offset & ~PAGE_MASK)
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goto out;
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err = sys_mmap2(a.addr, a.len, a.prot, a.flags,
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a.fd, a.offset >> PAGE_SHIFT);
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out:
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return err;
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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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/*
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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,
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int third, 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,
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(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: /* iBCS2 emulator entry point */
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if (!segment_eq(get_fs(), get_ds()))
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return -EINVAL;
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/* The "(ulong *) third" is valid _only_ because of the kernel segment thing */
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return do_shmat (first, (char __user *) ptr, second, (ulong *) third);
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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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/*
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* Old cruft
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*/
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asmlinkage int sys_uname(struct old_utsname __user * name)
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{
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int err;
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if (!name)
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return -EFAULT;
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down_read(&uts_sem);
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err = copy_to_user(name, utsname(), sizeof (*name));
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up_read(&uts_sem);
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return err?-EFAULT:0;
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}
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asmlinkage int sys_olduname(struct oldold_utsname __user * name)
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{
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int error;
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if (!name)
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return -EFAULT;
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if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
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return -EFAULT;
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down_read(&uts_sem);
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error = __copy_to_user(&name->sysname, &utsname()->sysname,
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__OLD_UTS_LEN);
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error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
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error |= __copy_to_user(&name->nodename, &utsname()->nodename,
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__OLD_UTS_LEN);
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error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
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error |= __copy_to_user(&name->release, &utsname()->release,
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__OLD_UTS_LEN);
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error |= __put_user(0, name->release + __OLD_UTS_LEN);
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error |= __copy_to_user(&name->version, &utsname()->version,
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__OLD_UTS_LEN);
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error |= __put_user(0, name->version + __OLD_UTS_LEN);
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error |= __copy_to_user(&name->machine, &utsname()->machine,
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__OLD_UTS_LEN);
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error |= __put_user(0, name->machine + __OLD_UTS_LEN);
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up_read(&uts_sem);
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error = error ? -EFAULT : 0;
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return error;
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}
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/*
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* Do a system call from kernel instead of calling sys_execve so we
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* end up with proper pt_regs.
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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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long __res;
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asm volatile ("push %%ebx ; movl %2,%%ebx ; int $0x80 ; pop %%ebx"
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: "=a" (__res)
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: "0" (__NR_execve),"ri" (filename),"c" (argv), "d" (envp) : "memory");
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return __res;
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}
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