Add generic sys_ipc wrapper

Add a generic implementation of the ipc demultiplexer syscall.  Except for
s390 and sparc64 all implementations of the sys_ipc are nearly identical.

There are slight differences in the types of the parameters, where mips
and powerpc as the only 64-bit architectures with sys_ipc use unsigned
long for the "third" argument as it gets casted to a pointer later, while
it traditionally is an "int" like most other paramters.  frv goes even
further and uses unsigned long for all parameters execept for "ptr" which
is a pointer type everywhere.  The change from int to unsigned long for
"third" and back to "int" for the others on frv should be fine due to the
in-register calling conventions for syscalls (we already had a similar
issue with the generic sys_ptrace), but I'd prefer to have the arch
maintainers looks over this in details.

Except for that h8300, m68k and m68knommu lack an impplementation of the
semtimedop sub call which this patch adds, and various architectures have
gets used - at least on i386 it seems superflous as the compat code on
x86-64 and ia64 doesn't even bother to implement it.

[akpm@linux-foundation.org: add sys_ipc to sys_ni.c]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Reviewed-by: H. Peter Anvin <hpa@zytor.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: James Morris <jmorris@namei.org>
Cc: Andreas Schwab <schwab@linux-m68k.org>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: David Howells <dhowells@redhat.com>
Acked-by: Kyle McMartin <kyle@mcmartin.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 1 insertions, 96 deletions

diff --git a/arch/powerpc/include/asm/syscalls.h b/arch/powerpc/include/asm/syscalls.h
index eb8eb40..23bb74e 100644
--- a/arch/powerpc/include/asm/syscalls.h
+++ b/arch/powerpc/include/asm/syscalls.h
@@ -35,8 +35,6 @@ asmlinkage long sys_pipe2(int __user *fildes, int flags);
 asmlinkage long sys_rt_sigaction(int sig,
 		const struct sigaction __user *act,
 		struct sigaction __user *oact, size_t sigsetsize);
-asmlinkage int sys_ipc(uint call, int first, unsigned long second,
-		long third, void __user *ptr, long fifth);
 asmlinkage long ppc64_personality(unsigned long personality);
 asmlinkage int ppc_rtas(struct rtas_args __user *uargs);
 asmlinkage time_t sys64_time(time_t __user * tloc);
diff --git a/arch/powerpc/include/asm/unistd.h b/arch/powerpc/include/asm/unistd.h
index f6ca761..c13821f 100644
--- a/arch/powerpc/include/asm/unistd.h
+++ b/arch/powerpc/include/asm/unistd.h
@@ -364,6 +364,7 @@
 #define __ARCH_WANT_STAT64
 #define __ARCH_WANT_SYS_ALARM
 #define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_IPC
 #define __ARCH_WANT_SYS_PAUSE
 #define __ARCH_WANT_SYS_SGETMASK
 #define __ARCH_WANT_SYS_SIGNAL
diff --git a/arch/powerpc/kernel/syscalls.c b/arch/powerpc/kernel/syscalls.c
index 3370e62..5251221 100644
--- a/arch/powerpc/kernel/syscalls.c
+++ b/arch/powerpc/kernel/syscalls.c
@@ -42,100 +42,6 @@
 #include <asm/time.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, unsigned long second, long third,
-	    void __user *ptr, long fifth)
-{
-	int version, ret;
-
-	version = call >> 16; /* hack for backward compatibility */
-	call &= 0xffff;
-
-	ret = -ENOSYS;
-	switch (call) {
-	case SEMOP:
-		ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
-				      (unsigned)second, NULL);
-		break;
-	case SEMTIMEDOP:
-		ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
-				      (unsigned)second,
-				      (const struct timespec __user *) fifth);
-		break;
-	case SEMGET:
-		ret = sys_semget (first, (int)second, third);
-		break;
-	case SEMCTL: {
-		union semun fourth;
-
-		ret = -EINVAL;
-		if (!ptr)
-			break;
-		if ((ret = get_user(fourth.__pad, (void __user * __user *)ptr)))
-			break;
-		ret = sys_semctl(first, (int)second, third, fourth);
-		break;
-	}
-	case MSGSND:
-		ret = sys_msgsnd(first, (struct msgbuf __user *)ptr,
-				 (size_t)second, third);
-		break;
-	case MSGRCV:
-		switch (version) {
-		case 0: {
-			struct ipc_kludge tmp;
-
-			ret = -EINVAL;
-			if (!ptr)
-				break;
-			if ((ret = copy_from_user(&tmp,
-						(struct ipc_kludge __user *) ptr,
-						sizeof (tmp)) ? -EFAULT : 0))
-				break;
-			ret = sys_msgrcv(first, tmp.msgp, (size_t) second,
-					  tmp.msgtyp, third);
-			break;
-		}
-		default:
-			ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
-					  (size_t)second, fifth, third);
-			break;
-		}
-		break;
-	case MSGGET:
-		ret = sys_msgget((key_t)first, (int)second);
-		break;
-	case MSGCTL:
-		ret = sys_msgctl(first, (int)second,
-				  (struct msqid_ds __user *)ptr);
-		break;
-	case SHMAT: {
-		ulong raddr;
-		ret = do_shmat(first, (char __user *)ptr, (int)second, &raddr);
-		if (ret)
-			break;
-		ret = put_user(raddr, (ulong __user *) third);
-		break;
-	}
-	case SHMDT:
-		ret = sys_shmdt((char __user *)ptr);
-		break;
-	case SHMGET:
-		ret = sys_shmget(first, (size_t)second, third);
-		break;
-	case SHMCTL:
-		ret = sys_shmctl(first, (int)second,
-				 (struct shmid_ds __user *)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 off, int shift)