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/*
* arch/v850/kernel/syscalls.c -- Various system-call definitions not
* defined in machine-independent code
*
* Copyright (C) 2001,02 NEC Corporation
* Copyright (C) 2001,02 Miles Bader <miles@gnu.org>
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file COPYING in the main directory of this
* archive for more details.
*
* This file was derived the ppc version, arch/ppc/kernel/syscalls.c
* ... which was derived from "arch/i386/kernel/sys_i386.c" by Gary Thomas;
* modified by Cort Dougan (cort@cs.nmt.edu)
* and Paul Mackerras (paulus@cs.anu.edu.au).
*/
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/syscalls.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/mman.h>
#include <linux/sys.h>
#include <linux/ipc.h>
#include <linux/utsname.h>
#include <linux/file.h>
#include <asm/uaccess.h>
#include <asm/semaphore.h>
#include <asm/unistd.h>
/*
* sys_ipc() is the de-multiplexer for the SysV IPC calls..
*
* This is really horribly ugly.
*/
int
sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
{
int version, ret;
version = call >> 16; /* hack for backward compatibility */
call &= 0xffff;
ret = -EINVAL;
switch (call) {
case SEMOP:
ret = sys_semop (first, (struct sembuf *)ptr, second);
break;
case SEMGET:
ret = sys_semget (first, second, third);
break;
case SEMCTL:
{
union semun fourth;
if (!ptr)
break;
if ((ret = access_ok(VERIFY_READ, ptr, sizeof(long)) ? 0 : -EFAULT)
|| (ret = get_user(fourth.__pad, (void **)ptr)))
break;
ret = sys_semctl (first, second, third, fourth);
break;
}
case MSGSND:
ret = sys_msgsnd (first, (struct msgbuf *) ptr, second, third);
break;
case MSGRCV:
switch (version) {
case 0: {
struct ipc_kludge tmp;
if (!ptr)
break;
if ((ret = access_ok(VERIFY_READ, ptr, sizeof(tmp)) ? 0 : -EFAULT)
|| (ret = copy_from_user(&tmp,
(struct ipc_kludge *) ptr,
sizeof (tmp))))
break;
ret = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp,
third);
break;
}
default:
ret = sys_msgrcv (first, (struct msgbuf *) ptr,
second, fifth, third);
break;
}
break;
case MSGGET:
ret = sys_msgget ((key_t) first, second);
break;
case MSGCTL:
ret = sys_msgctl (first, second, (struct msqid_ds *) ptr);
break;
case SHMAT:
switch (version) {
default: {
ulong raddr;
if ((ret = access_ok(VERIFY_WRITE, (ulong*) third,
sizeof(ulong)) ? 0 : -EFAULT))
break;
ret = do_shmat (first, (char *) ptr, second, &raddr);
if (ret)
break;
ret = put_user (raddr, (ulong *) third);
break;
}
case 1: /* iBCS2 emulator entry point */
if (!segment_eq(get_fs(), get_ds()))
break;
ret = do_shmat (first, (char *) ptr, second,
(ulong *) third);
break;
}
break;
case SHMDT:
ret = sys_shmdt ((char *)ptr);
break;
case SHMGET:
ret = sys_shmget (first, second, third);
break;
case SHMCTL:
ret = sys_shmctl (first, second, (struct shmid_ds *) ptr);
break;
}
return ret;
}
/*
* sys_pipe() is the normal C calling standard for creating
* a pipe. It's not the way unix traditionally does this, though.
*/
int sys_pipe (int *fildes)
{
int fd[2];
int error;
error = do_pipe (fd);
if (!error) {
if (copy_to_user (fildes, fd, 2*sizeof (int)))
error = -EFAULT;
}
return error;
}
static inline unsigned long
do_mmap2 (unsigned long addr, size_t len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff)
{
struct file * file = NULL;
int ret = -EBADF;
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
if (! (flags & MAP_ANONYMOUS)) {
if (!(file = fget (fd)))
goto out;
}
down_write (¤t->mm->mmap_sem);
ret = do_mmap_pgoff (file, addr, len, prot, flags, pgoff);
up_write (¤t->mm->mmap_sem);
if (file)
fput (file);
out:
return ret;
}
unsigned long sys_mmap2 (unsigned long addr, size_t len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff)
{
return do_mmap2 (addr, len, prot, flags, fd, pgoff);
}
unsigned long sys_mmap (unsigned long addr, size_t len,
unsigned long prot, unsigned long flags,
unsigned long fd, off_t offset)
{
int err = -EINVAL;
if (offset & ~PAGE_MASK)
goto out;
err = do_mmap2 (addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
out:
return err;
}
/*
* Do a system call from kernel instead of calling sys_execve so we
* end up with proper pt_regs.
*/
int kernel_execve(const char *filename, char *const argv[], char *const envp[])
{
register char *__a __asm__ ("r6") = filename;
register void *__b __asm__ ("r7") = argv;
register void *__c __asm__ ("r8") = envp;
register unsigned long __syscall __asm__ ("r12") = __NR_execve;
register unsigned long __ret __asm__ ("r10");
__asm__ __volatile__ ("trap 0"
: "=r" (__ret), "=r" (__syscall)
: "1" (__syscall), "r" (__a), "r" (__b), "r" (__c)
: "r1", "r5", "r11", "r13", "r14",
"r15", "r16", "r17", "r18", "r19");
return __ret;
}
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