blob: 1884a8d12bfaf130d99d7f9602268c5a7048271d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * This file contains various random system calls that
3 * have a non-standard calling sequence on the Linux/i386
4 * platform.
5 */
6
7#include <linux/errno.h>
8#include <linux/sched.h>
9#include <linux/mm.h>
Alexey Dobriyan4e950f62007-07-30 02:36:13 +040010#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/sem.h>
13#include <linux/msg.h>
14#include <linux/shm.h>
15#include <linux/stat.h>
16#include <linux/syscalls.h>
17#include <linux/mman.h>
18#include <linux/file.h>
19#include <linux/utsname.h>
Adrian Bunkcba4fbb2007-10-16 23:29:24 -070020#include <linux/ipc.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +020022#include <linux/uaccess.h>
23#include <linux/unistd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
Jaswinder Singhbbc1f692008-07-21 21:34:13 +053025#include <asm/syscalls.h>
26
Michael Buescha7290ee2006-03-22 00:08:44 -080027asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
28 unsigned long prot, unsigned long flags,
29 unsigned long fd, unsigned long pgoff)
Linus Torvalds1da177e2005-04-16 15:20:36 -070030{
31 int error = -EBADF;
Michael Buescha7290ee2006-03-22 00:08:44 -080032 struct file *file = NULL;
33 struct mm_struct *mm = current->mm;
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
35 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
36 if (!(flags & MAP_ANONYMOUS)) {
37 file = fget(fd);
38 if (!file)
39 goto out;
40 }
41
Michael Buescha7290ee2006-03-22 00:08:44 -080042 down_write(&mm->mmap_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
Michael Buescha7290ee2006-03-22 00:08:44 -080044 up_write(&mm->mmap_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46 if (file)
47 fput(file);
48out:
49 return error;
50}
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052/*
53 * Perform the select(nd, in, out, ex, tv) and mmap() system
54 * calls. Linux/i386 didn't use to be able to handle more than
55 * 4 system call parameters, so these system calls used a memory
56 * block for parameter passing..
57 */
58
59struct mmap_arg_struct {
60 unsigned long addr;
61 unsigned long len;
62 unsigned long prot;
63 unsigned long flags;
64 unsigned long fd;
65 unsigned long offset;
66};
67
68asmlinkage int old_mmap(struct mmap_arg_struct __user *arg)
69{
70 struct mmap_arg_struct a;
71 int err = -EFAULT;
72
73 if (copy_from_user(&a, arg, sizeof(a)))
74 goto out;
75
76 err = -EINVAL;
77 if (a.offset & ~PAGE_MASK)
78 goto out;
79
Michael Buescha7290ee2006-03-22 00:08:44 -080080 err = sys_mmap2(a.addr, a.len, a.prot, a.flags,
81 a.fd, a.offset >> PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082out:
83 return err;
84}
85
86
87struct sel_arg_struct {
88 unsigned long n;
89 fd_set __user *inp, *outp, *exp;
90 struct timeval __user *tvp;
91};
92
93asmlinkage int old_select(struct sel_arg_struct __user *arg)
94{
95 struct sel_arg_struct a;
96
97 if (copy_from_user(&a, arg, sizeof(a)))
98 return -EFAULT;
99 /* sys_select() does the appropriate kernel locking */
100 return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
101}
102
103/*
104 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
105 *
106 * This is really horribly ugly.
107 */
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200108asmlinkage int sys_ipc(uint call, int first, int second,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 int third, void __user *ptr, long fifth)
110{
111 int version, ret;
112
113 version = call >> 16; /* hack for backward compatibility */
114 call &= 0xffff;
115
116 switch (call) {
117 case SEMOP:
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200118 return sys_semtimedop(first, (struct sembuf __user *)ptr, second, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 case SEMTIMEDOP:
120 return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
121 (const struct timespec __user *)fifth);
122
123 case SEMGET:
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200124 return sys_semget(first, second, third);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 case SEMCTL: {
126 union semun fourth;
127 if (!ptr)
128 return -EINVAL;
129 if (get_user(fourth.__pad, (void __user * __user *) ptr))
130 return -EFAULT;
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200131 return sys_semctl(first, second, third, fourth);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 }
133
134 case MSGSND:
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200135 return sys_msgsnd(first, (struct msgbuf __user *) ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 second, third);
137 case MSGRCV:
138 switch (version) {
139 case 0: {
140 struct ipc_kludge tmp;
141 if (!ptr)
142 return -EINVAL;
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 if (copy_from_user(&tmp,
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200145 (struct ipc_kludge __user *) ptr,
146 sizeof(tmp)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 return -EFAULT;
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200148 return sys_msgrcv(first, tmp.msgp, second,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 tmp.msgtyp, third);
150 }
151 default:
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200152 return sys_msgrcv(first,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 (struct msgbuf __user *) ptr,
154 second, fifth, third);
155 }
156 case MSGGET:
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200157 return sys_msgget((key_t) first, second);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 case MSGCTL:
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200159 return sys_msgctl(first, second, (struct msqid_ds __user *) ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
161 case SHMAT:
162 switch (version) {
163 default: {
164 ulong raddr;
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200165 ret = do_shmat(first, (char __user *) ptr, second, &raddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 if (ret)
167 return ret;
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200168 return put_user(raddr, (ulong __user *) third);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 }
170 case 1: /* iBCS2 emulator entry point */
171 if (!segment_eq(get_fs(), get_ds()))
172 return -EINVAL;
173 /* The "(ulong *) third" is valid _only_ because of the kernel segment thing */
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200174 return do_shmat(first, (char __user *) ptr, second, (ulong *) third);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 }
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200176 case SHMDT:
177 return sys_shmdt((char __user *)ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 case SHMGET:
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200179 return sys_shmget(first, second, third);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 case SHMCTL:
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200181 return sys_shmctl(first, second,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 (struct shmid_ds __user *) ptr);
183 default:
184 return -ENOSYS;
185 }
186}
187
188/*
189 * Old cruft
190 */
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200191asmlinkage int sys_uname(struct old_utsname __user *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192{
193 int err;
194 if (!name)
195 return -EFAULT;
196 down_read(&uts_sem);
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200197 err = copy_to_user(name, utsname(), sizeof(*name));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 up_read(&uts_sem);
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200199 return err? -EFAULT:0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200}
201
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200202asmlinkage int sys_olduname(struct oldold_utsname __user *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203{
204 int error;
205
206 if (!name)
207 return -EFAULT;
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200208 if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 return -EFAULT;
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200210
211 down_read(&uts_sem);
212
Serge E. Hallyne9ff3992006-10-02 02:18:11 -0700213 error = __copy_to_user(&name->sysname, &utsname()->sysname,
214 __OLD_UTS_LEN);
215 error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
216 error |= __copy_to_user(&name->nodename, &utsname()->nodename,
217 __OLD_UTS_LEN);
218 error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
219 error |= __copy_to_user(&name->release, &utsname()->release,
220 __OLD_UTS_LEN);
221 error |= __put_user(0, name->release + __OLD_UTS_LEN);
222 error |= __copy_to_user(&name->version, &utsname()->version,
223 __OLD_UTS_LEN);
224 error |= __put_user(0, name->version + __OLD_UTS_LEN);
225 error |= __copy_to_user(&name->machine, &utsname()->machine,
226 __OLD_UTS_LEN);
227 error |= __put_user(0, name->machine + __OLD_UTS_LEN);
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200228
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 up_read(&uts_sem);
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200230
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 error = error ? -EFAULT : 0;
232
233 return error;
234}
Arnd Bergmannfe742902006-10-02 02:18:34 -0700235
236
237/*
238 * Do a system call from kernel instead of calling sys_execve so we
239 * end up with proper pt_regs.
240 */
241int kernel_execve(const char *filename, char *const argv[], char *const envp[])
242{
243 long __res;
244 asm volatile ("push %%ebx ; movl %2,%%ebx ; int $0x80 ; pop %%ebx"
245 : "=a" (__res)
Paolo Ciarrocchi5b80fe82008-06-07 14:34:42 +0200246 : "0" (__NR_execve), "ri" (filename), "c" (argv), "d" (envp) : "memory");
Arnd Bergmannfe742902006-10-02 02:18:34 -0700247 return __res;
248}