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1 /*
2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
3  *
4  *   This program is free software; you can redistribute it and/or
5  *   modify it under the terms of the GNU General Public License
6  *   as published by the Free Software Foundation, version 2.
7  *
8  *   This program is distributed in the hope that it will be useful, but
9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11  *   NON INFRINGEMENT.  See the GNU General Public License for
12  *   more details.
13  */
14 
15 /* Adjust unistd.h to provide 32-bit numbers and functions. */
16 #define __SYSCALL_COMPAT
17 
18 #include <linux/compat.h>
19 #include <linux/syscalls.h>
20 #include <linux/kdev_t.h>
21 #include <linux/fs.h>
22 #include <linux/fcntl.h>
23 #include <linux/uaccess.h>
24 #include <linux/signal.h>
25 #include <asm/syscalls.h>
26 
27 /*
28  * Syscalls that take 64-bit numbers traditionally take them in 32-bit
29  * "high" and "low" value parts on 32-bit architectures.
30  * In principle, one could imagine passing some register arguments as
31  * fully 64-bit on TILE-Gx in 32-bit mode, but it seems easier to
32  * adapt the usual convention.
33  */
34 
COMPAT_SYSCALL_DEFINE4(truncate64,char __user *,filename,u32,dummy,u32,low,u32,high)35 COMPAT_SYSCALL_DEFINE4(truncate64, char __user *, filename, u32, dummy,
36                        u32, low, u32, high)
37 {
38 	return sys_truncate(filename, ((loff_t)high << 32) | low);
39 }
40 
COMPAT_SYSCALL_DEFINE4(ftruncate64,unsigned int,fd,u32,dummy,u32,low,u32,high)41 COMPAT_SYSCALL_DEFINE4(ftruncate64, unsigned int, fd, u32, dummy,
42                        u32, low, u32, high)
43 {
44 	return sys_ftruncate(fd, ((loff_t)high << 32) | low);
45 }
46 
COMPAT_SYSCALL_DEFINE6(pread64,unsigned int,fd,char __user *,ubuf,size_t,count,u32,dummy,u32,low,u32,high)47 COMPAT_SYSCALL_DEFINE6(pread64, unsigned int, fd, char __user *, ubuf,
48                        size_t, count, u32, dummy, u32, low, u32, high)
49 {
50 	return sys_pread64(fd, ubuf, count, ((loff_t)high << 32) | low);
51 }
52 
COMPAT_SYSCALL_DEFINE6(pwrite64,unsigned int,fd,char __user *,ubuf,size_t,count,u32,dummy,u32,low,u32,high)53 COMPAT_SYSCALL_DEFINE6(pwrite64, unsigned int, fd, char __user *, ubuf,
54                        size_t, count, u32, dummy, u32, low, u32, high)
55 {
56 	return sys_pwrite64(fd, ubuf, count, ((loff_t)high << 32) | low);
57 }
58 
COMPAT_SYSCALL_DEFINE6(sync_file_range2,int,fd,unsigned int,flags,u32,offset_lo,u32,offset_hi,u32,nbytes_lo,u32,nbytes_hi)59 COMPAT_SYSCALL_DEFINE6(sync_file_range2, int, fd, unsigned int, flags,
60                        u32, offset_lo, u32, offset_hi,
61                        u32, nbytes_lo, u32, nbytes_hi)
62 {
63 	return sys_sync_file_range(fd, ((loff_t)offset_hi << 32) | offset_lo,
64 				   ((loff_t)nbytes_hi << 32) | nbytes_lo,
65 				   flags);
66 }
67 
COMPAT_SYSCALL_DEFINE6(fallocate,int,fd,int,mode,u32,offset_lo,u32,offset_hi,u32,len_lo,u32,len_hi)68 COMPAT_SYSCALL_DEFINE6(fallocate, int, fd, int, mode,
69                        u32, offset_lo, u32, offset_hi,
70                        u32, len_lo, u32, len_hi)
71 {
72 	return sys_fallocate(fd, mode, ((loff_t)offset_hi << 32) | offset_lo,
73 			     ((loff_t)len_hi << 32) | len_lo);
74 }
75 
76 /*
77  * Avoid bug in generic sys_llseek() that specifies offset_high and
78  * offset_low as "unsigned long", thus making it possible to pass
79  * a sign-extended high 32 bits in offset_low.
80  */
COMPAT_SYSCALL_DEFINE5(llseek,unsigned int,fd,unsigned int,offset_high,unsigned int,offset_low,loff_t __user *,result,unsigned int,origin)81 COMPAT_SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned int, offset_high,
82 		       unsigned int, offset_low, loff_t __user *, result,
83 		       unsigned int, origin)
84 {
85 	return sys_llseek(fd, offset_high, offset_low, result, origin);
86 }
87 
88 /* Provide the compat syscall number to call mapping. */
89 #undef __SYSCALL
90 #define __SYSCALL(nr, call) [nr] = (call),
91 
92 /* See comments in sys.c */
93 #define compat_sys_fadvise64_64 sys32_fadvise64_64
94 #define compat_sys_readahead sys32_readahead
95 #define sys_llseek compat_sys_llseek
96 
97 /* Call the assembly trampolines where necessary. */
98 #define compat_sys_rt_sigreturn _compat_sys_rt_sigreturn
99 #define sys_clone _sys_clone
100 
101 /*
102  * Note that we can't include <linux/unistd.h> here since the header
103  * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
104  */
105 void *compat_sys_call_table[__NR_syscalls] = {
106 	[0 ... __NR_syscalls-1] = sys_ni_syscall,
107 #include <asm/unistd.h>
108 };
109