summaryrefslogtreecommitdiffstats
path: root/arch/um/kernel/syscall.c
blob: cccab850c27ec221a5bf6d13a9e155a580c40a40 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
/*
 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include "linux/file.h"
#include "linux/fs.h"
#include "linux/mm.h"
#include "linux/sched.h"
#include "linux/utsname.h"
#include "linux/syscalls.h"
#include "asm/current.h"
#include "asm/mman.h"
#include "asm/uaccess.h"
#include "asm/unistd.h"
#include "internal.h"

long sys_fork(void)
{
	long ret;

	current->thread.forking = 1;
	ret = do_fork(SIGCHLD, UPT_SP(&current->thread.regs.regs),
		      &current->thread.regs, 0, NULL, NULL);
	current->thread.forking = 0;
	return ret;
}

long sys_vfork(void)
{
	long ret;

	current->thread.forking = 1;
	ret = do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
		      UPT_SP(&current->thread.regs.regs),
		      &current->thread.regs, 0, NULL, NULL);
	current->thread.forking = 0;
	return ret;
}

long old_mmap(unsigned long addr, unsigned long len,
	      unsigned long prot, unsigned long flags,
	      unsigned long fd, unsigned long offset)
{
	long err = -EINVAL;
	if (offset & ~PAGE_MASK)
		goto out;

	err = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
 out:
	return err;
}

long sys_uname(struct old_utsname __user * name)
{
	long err;
	if (!name)
		return -EFAULT;
	down_read(&uts_sem);
	err = copy_to_user(name, utsname(), sizeof (*name));
	up_read(&uts_sem);
	return err?-EFAULT:0;
}

long sys_olduname(struct oldold_utsname __user * name)
{
	long error;

	if (!name)
		return -EFAULT;
	if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
		return -EFAULT;

	down_read(&uts_sem);

	error = __copy_to_user(&name->sysname, &utsname()->sysname,
			       __OLD_UTS_LEN);
	error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
	error |= __copy_to_user(&name->nodename, &utsname()->nodename,
				__OLD_UTS_LEN);
	error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
	error |= __copy_to_user(&name->release, &utsname()->release,
				__OLD_UTS_LEN);
	error |= __put_user(0, name->release + __OLD_UTS_LEN);
	error |= __copy_to_user(&name->version, &utsname()->version,
				__OLD_UTS_LEN);
	error |= __put_user(0, name->version + __OLD_UTS_LEN);
	error |= __copy_to_user(&name->machine, &utsname()->machine,
				__OLD_UTS_LEN);
	error |= __put_user(0, name->machine + __OLD_UTS_LEN);

	up_read(&uts_sem);

	error = error ? -EFAULT : 0;

	return error;
}

int kernel_execve(const char *filename, char *const argv[], char *const envp[])
{
	mm_segment_t fs;
	int ret;

	fs = get_fs();
	set_fs(KERNEL_DS);
	ret = um_execve((char *)filename, (char __user *__user *)argv,
			(char __user *__user *) envp);
	set_fs(fs);

	return ret;
}
OpenPOWER on IntegriCloud