237c4eab7cfd6c429a6ca8831a6a681671a3ddd6
[linux-2.6.git] / arch / um / kernel / syscall.c
1 /*
2  * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
3  * Licensed under the GPL
4  */
5
6 #include "linux/sched.h"
7 #include "linux/file.h"
8 #include "linux/smp_lock.h"
9 #include "linux/mm.h"
10 #include "linux/utsname.h"
11 #include "linux/msg.h"
12 #include "linux/shm.h"
13 #include "linux/sys.h"
14 #include "linux/syscalls.h"
15 #include "linux/unistd.h"
16 #include "linux/slab.h"
17 #include "linux/utime.h"
18 #include "asm/mman.h"
19 #include "asm/uaccess.h"
20 #include "kern_util.h"
21 #include "sysdep/syscalls.h"
22 #include "mode_kern.h"
23 #include "choose-mode.h"
24
25 /*  Unlocked, I don't care if this is a bit off */
26 int nsyscalls = 0;
27
28 long sys_fork(void)
29 {
30         long ret;
31
32         current->thread.forking = 1;
33         ret = do_fork(SIGCHLD, UPT_SP(&current->thread.regs.regs),
34                       &current->thread.regs, 0, NULL, NULL);
35         current->thread.forking = 0;
36         return(ret);
37 }
38
39 long sys_vfork(void)
40 {
41         long ret;
42
43         current->thread.forking = 1;
44         ret = do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
45                       UPT_SP(&current->thread.regs.regs),
46                       &current->thread.regs, 0, NULL, NULL);
47         current->thread.forking = 0;
48         return(ret);
49 }
50
51 /* common code for old and new mmaps */
52 long sys_mmap2(unsigned long addr, unsigned long len,
53                unsigned long prot, unsigned long flags,
54                unsigned long fd, unsigned long pgoff)
55 {
56         long error = -EBADF;
57         struct file * file = NULL;
58
59         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
60         if (!(flags & MAP_ANONYMOUS)) {
61                 file = fget(fd);
62                 if (!file)
63                         goto out;
64         }
65
66         down_write(&current->mm->mmap_sem);
67         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
68         up_write(&current->mm->mmap_sem);
69
70         if (file)
71                 fput(file);
72  out:
73         return error;
74 }
75
76 long old_mmap(unsigned long addr, unsigned long len,
77               unsigned long prot, unsigned long flags,
78               unsigned long fd, unsigned long offset)
79 {
80         long err = -EINVAL;
81         if (offset & ~PAGE_MASK)
82                 goto out;
83
84         err = sys_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
85  out:
86         return err;
87 }
88 /*
89  * sys_pipe() is the normal C calling standard for creating
90  * a pipe. It's not the way unix traditionally does this, though.
91  */
92 long sys_pipe(unsigned long __user * fildes)
93 {
94         int fd[2];
95         long error;
96
97         error = do_pipe(fd);
98         if (!error) {
99                 if (copy_to_user(fildes, fd, sizeof(fd)))
100                         error = -EFAULT;
101         }
102         return error;
103 }
104
105
106 long sys_uname(struct old_utsname __user * name)
107 {
108         long err;
109         if (!name)
110                 return -EFAULT;
111         down_read(&uts_sem);
112         err = copy_to_user(name, utsname(), sizeof (*name));
113         up_read(&uts_sem);
114         return err?-EFAULT:0;
115 }
116
117 long sys_olduname(struct oldold_utsname __user * name)
118 {
119         long error;
120
121         if (!name)
122                 return -EFAULT;
123         if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
124                 return -EFAULT;
125
126         down_read(&uts_sem);
127
128         error = __copy_to_user(&name->sysname, &utsname()->sysname,
129                                __OLD_UTS_LEN);
130         error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
131         error |= __copy_to_user(&name->nodename, &utsname()->nodename,
132                                 __OLD_UTS_LEN);
133         error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
134         error |= __copy_to_user(&name->release, &utsname()->release,
135                                 __OLD_UTS_LEN);
136         error |= __put_user(0, name->release + __OLD_UTS_LEN);
137         error |= __copy_to_user(&name->version, &utsname()->version,
138                                 __OLD_UTS_LEN);
139         error |= __put_user(0, name->version + __OLD_UTS_LEN);
140         error |= __copy_to_user(&name->machine, &utsname()->machine,
141                                 __OLD_UTS_LEN);
142         error |= __put_user(0, name->machine + __OLD_UTS_LEN);
143
144         up_read(&uts_sem);
145
146         error = error ? -EFAULT : 0;
147
148         return error;
149 }
150
151 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
152 {
153         mm_segment_t fs;
154         int ret;
155
156         fs = get_fs();
157         set_fs(KERNEL_DS);
158         ret = um_execve(filename, argv, envp);
159         set_fs(fs);
160
161         return ret;
162 }