linux/arch/v850/kernel/syscalls.c
Ulrich Drepper d35c7b0e54 unified (weak) sys_pipe implementation
This replaces the duplicated arch-specific versions of "sys_pipe()" with
one unified implementation.  This removes almost 250 lines of duplicated
code.

It's marked __weak, so that *if* an architecture wants to override the
default implementation it can do so by simply having its own replacement
version, since many architectures use alternate calling conventions for
the 'pipe()' system call for legacy reasons (ie traditional UNIX
implementations often return the two file descriptors in registers)

I still haven't changed the cris version even though Linus says the BKL
isn't needed.  The arch maintainer can easily do it if there are really
no obstacles.

Signed-off-by: Ulrich Drepper <drepper@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-03 13:50:33 -07:00

196 lines
4.7 KiB
C

/*
* 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/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;
}
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 (&current->mm->mmap_sem);
ret = do_mmap_pgoff (file, addr, len, prot, flags, pgoff);
up_write (&current->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;
}