xref: /openbmc/linux/arch/xtensa/kernel/syscall.c (revision 22246614)
1 /*
2  * arch/xtensa/kernel/syscall.c
3  *
4  * This file is subject to the terms and conditions of the GNU General Public
5  * License.  See the file "COPYING" in the main directory of this archive
6  * for more details.
7  *
8  * Copyright (C) 2001 - 2005 Tensilica Inc.
9  * Copyright (C) 2000 Silicon Graphics, Inc.
10  * Copyright (C) 1995 - 2000 by Ralf Baechle
11  *
12  * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
13  * Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca>
14  * Chris Zankel <chris@zankel.net>
15  * Kevin Chea
16  *
17  */
18 #include <asm/uaccess.h>
19 #include <asm/syscall.h>
20 #include <asm/unistd.h>
21 #include <linux/linkage.h>
22 #include <linux/stringify.h>
23 #include <linux/errno.h>
24 #include <linux/syscalls.h>
25 #include <linux/file.h>
26 #include <linux/fs.h>
27 #include <linux/mman.h>
28 #include <linux/shm.h>
29 
30 typedef void (*syscall_t)(void);
31 
32 syscall_t sys_call_table[__NR_syscall_count] /* FIXME __cacheline_aligned */= {
33 	[0 ... __NR_syscall_count - 1] = (syscall_t)&sys_ni_syscall,
34 
35 #undef __SYSCALL
36 #define __SYSCALL(nr,symbol,nargs) [ nr ] = (syscall_t)symbol,
37 #undef _XTENSA_UNISTD_H
38 #undef  __KERNEL_SYSCALLS__
39 #include <asm/unistd.h>
40 };
41 
42 /*
43  * xtensa_pipe() is the normal C calling standard for creating a pipe. It's not
44  * the way unix traditional does this, though.
45  */
46 
47 asmlinkage long xtensa_pipe(int __user *userfds)
48 {
49 	int fd[2];
50 	int error;
51 
52 	error = do_pipe(fd);
53 	if (!error) {
54 		if (copy_to_user(userfds, fd, 2 * sizeof(int)))
55 			error = -EFAULT;
56 	}
57 	return error;
58 }
59 
60 
61 asmlinkage long xtensa_mmap2(unsigned long addr, unsigned long len,
62    			     unsigned long prot, unsigned long flags,
63 			     unsigned long fd, unsigned long pgoff)
64 {
65 	int error = -EBADF;
66 	struct file * file = NULL;
67 
68 	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
69 	if (!(flags & MAP_ANONYMOUS)) {
70 		file = fget(fd);
71 		if (!file)
72 			goto out;
73 	}
74 
75 	down_write(&current->mm->mmap_sem);
76 	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
77 	up_write(&current->mm->mmap_sem);
78 
79 	if (file)
80 		fput(file);
81 out:
82 	return error;
83 }
84 
85 asmlinkage long xtensa_shmat(int shmid, char __user *shmaddr, int shmflg)
86 {
87 	unsigned long ret;
88 	long err;
89 
90 	err = do_shmat(shmid, shmaddr, shmflg, &ret);
91 	if (err)
92 		return err;
93 	return (long)ret;
94 }
95 
96 asmlinkage long xtensa_fadvise64_64(int fd, int advice, unsigned long long offset, unsigned long long len)
97 {
98 	return sys_fadvise64_64(fd, offset, len, advice);
99 }
100 
101