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authorChristoph Hellwig <hch@lst.de>2010-03-10 18:21:18 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-12 18:52:32 -0500
commitbaed7fc9b580bd3fb8252ff1d9b36eaf1f86b670 (patch)
tree38f23cd9888b92de3f73ed1f4ce48cd83e940e0e /arch/um/sys-i386/syscalls.c
parenta4679373cf4ee0e7792dc56205365732b725c2c1 (diff)
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>
Diffstat (limited to 'arch/um/sys-i386/syscalls.c')
-rw-r--r--arch/um/sys-i386/syscalls.c86
1 files changed, 0 insertions, 86 deletions
diff --git a/arch/um/sys-i386/syscalls.c b/arch/um/sys-i386/syscalls.c
index d0aa8f125ee..70ca357393b 100644
--- a/arch/um/sys-i386/syscalls.c
+++ b/arch/um/sys-i386/syscalls.c
@@ -34,92 +34,6 @@ long sys_clone(unsigned long clone_flags, unsigned long newsp,
34 return ret; 34 return ret;
35} 35}
36 36
37/*
38 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
39 *
40 * This is really horribly ugly.
41 */
42long sys_ipc (uint call, int first, int second,
43 int third, void __user *ptr, long fifth)
44{
45 int version, ret;
46
47 version = call >> 16; /* hack for backward compatibility */
48 call &= 0xffff;
49
50 switch (call) {
51 case SEMOP:
52 return sys_semtimedop(first, (struct sembuf __user *) ptr,
53 second, NULL);
54 case SEMTIMEDOP:
55 return sys_semtimedop(first, (struct sembuf __user *) ptr,
56 second,
57 (const struct timespec __user *) fifth);
58 case SEMGET:
59 return sys_semget (first, second, third);
60 case SEMCTL: {
61 union semun fourth;
62 if (!ptr)
63 return -EINVAL;
64 if (get_user(fourth.__pad, (void __user * __user *) ptr))
65 return -EFAULT;
66 return sys_semctl (first, second, third, fourth);
67 }
68
69 case MSGSND:
70 return sys_msgsnd (first, (struct msgbuf *) ptr,
71 second, third);
72 case MSGRCV:
73 switch (version) {
74 case 0: {
75 struct ipc_kludge tmp;
76 if (!ptr)
77 return -EINVAL;
78
79 if (copy_from_user(&tmp,
80 (struct ipc_kludge *) ptr,
81 sizeof (tmp)))
82 return -EFAULT;
83 return sys_msgrcv (first, tmp.msgp, second,
84 tmp.msgtyp, third);
85 }
86 default:
87 panic("msgrcv with version != 0");
88 return sys_msgrcv (first,
89 (struct msgbuf *) ptr,
90 second, fifth, third);
91 }
92 case MSGGET:
93 return sys_msgget ((key_t) first, second);
94 case MSGCTL:
95 return sys_msgctl (first, second, (struct msqid_ds *) ptr);
96
97 case SHMAT:
98 switch (version) {
99 default: {
100 ulong raddr;
101 ret = do_shmat (first, (char *) ptr, second, &raddr);
102 if (ret)
103 return ret;
104 return put_user (raddr, (ulong *) third);
105 }
106 case 1: /* iBCS2 emulator entry point */
107 if (!segment_eq(get_fs(), get_ds()))
108 return -EINVAL;
109 return do_shmat (first, (char *) ptr, second, (ulong *) third);
110 }
111 case SHMDT:
112 return sys_shmdt ((char *)ptr);
113 case SHMGET:
114 return sys_shmget (first, second, third);
115 case SHMCTL:
116 return sys_shmctl (first, second,
117 (struct shmid_ds *) ptr);
118 default:
119 return -ENOSYS;
120 }
121}
122
123long sys_sigaction(int sig, const struct old_sigaction __user *act, 37long sys_sigaction(int sig, const struct old_sigaction __user *act,
124 struct old_sigaction __user *oact) 38 struct old_sigaction __user *oact)
125{ 39{