compat: Make compat_alloc_user_space() incorporate the access_ok()
[linux-2.6.git] / arch / powerpc / include / asm / compat.h
1 #ifndef _ASM_POWERPC_COMPAT_H
2 #define _ASM_POWERPC_COMPAT_H
3 #ifdef __KERNEL__
4 /*
5  * Architecture specific compatibility types
6  */
7 #include <linux/types.h>
8 #include <linux/sched.h>
9
10 #define COMPAT_USER_HZ          100
11 #define COMPAT_UTS_MACHINE      "ppc\0\0"
12
13 typedef u32             compat_size_t;
14 typedef s32             compat_ssize_t;
15 typedef s32             compat_time_t;
16 typedef s32             compat_clock_t;
17 typedef s32             compat_pid_t;
18 typedef u32             __compat_uid_t;
19 typedef u32             __compat_gid_t;
20 typedef u32             __compat_uid32_t;
21 typedef u32             __compat_gid32_t;
22 typedef u32             compat_mode_t;
23 typedef u32             compat_ino_t;
24 typedef u32             compat_dev_t;
25 typedef s32             compat_off_t;
26 typedef s64             compat_loff_t;
27 typedef s16             compat_nlink_t;
28 typedef u16             compat_ipc_pid_t;
29 typedef s32             compat_daddr_t;
30 typedef u32             compat_caddr_t;
31 typedef __kernel_fsid_t compat_fsid_t;
32 typedef s32             compat_key_t;
33 typedef s32             compat_timer_t;
34
35 typedef s32             compat_int_t;
36 typedef s32             compat_long_t;
37 typedef s64             compat_s64;
38 typedef u32             compat_uint_t;
39 typedef u32             compat_ulong_t;
40 typedef u64             compat_u64;
41
42 struct compat_timespec {
43         compat_time_t   tv_sec;
44         s32             tv_nsec;
45 };
46
47 struct compat_timeval {
48         compat_time_t   tv_sec;
49         s32             tv_usec;
50 };
51
52 struct compat_stat {
53         compat_dev_t    st_dev;
54         compat_ino_t    st_ino;
55         compat_mode_t   st_mode;
56         compat_nlink_t  st_nlink;
57         __compat_uid32_t        st_uid;
58         __compat_gid32_t        st_gid;
59         compat_dev_t    st_rdev;
60         compat_off_t    st_size;
61         compat_off_t    st_blksize;
62         compat_off_t    st_blocks;
63         compat_time_t   st_atime;
64         u32             st_atime_nsec;
65         compat_time_t   st_mtime;
66         u32             st_mtime_nsec;
67         compat_time_t   st_ctime;
68         u32             st_ctime_nsec;
69         u32             __unused4[2];
70 };
71
72 struct compat_flock {
73         short           l_type;
74         short           l_whence;
75         compat_off_t    l_start;
76         compat_off_t    l_len;
77         compat_pid_t    l_pid;
78 };
79
80 #define F_GETLK64       12      /*  using 'struct flock64' */
81 #define F_SETLK64       13
82 #define F_SETLKW64      14
83
84 struct compat_flock64 {
85         short           l_type;
86         short           l_whence;
87         compat_loff_t   l_start;
88         compat_loff_t   l_len;
89         compat_pid_t    l_pid;
90 };
91
92 struct compat_statfs {
93         int             f_type;
94         int             f_bsize;
95         int             f_blocks;
96         int             f_bfree;
97         int             f_bavail;
98         int             f_files;
99         int             f_ffree;
100         compat_fsid_t   f_fsid;
101         int             f_namelen;      /* SunOS ignores this field. */
102         int             f_frsize;
103         int             f_spare[5];
104 };
105
106 #define COMPAT_RLIM_OLD_INFINITY        0x7fffffff
107 #define COMPAT_RLIM_INFINITY            0xffffffff
108
109 typedef u32             compat_old_sigset_t;
110
111 #define _COMPAT_NSIG            64
112 #define _COMPAT_NSIG_BPW        32
113
114 typedef u32             compat_sigset_word;
115
116 #define COMPAT_OFF_T_MAX        0x7fffffff
117 #define COMPAT_LOFF_T_MAX       0x7fffffffffffffffL
118
119 /*
120  * A pointer passed in from user mode. This should not
121  * be used for syscall parameters, just declare them
122  * as pointers because the syscall entry code will have
123  * appropriately converted them already.
124  */
125 typedef u32             compat_uptr_t;
126
127 static inline void __user *compat_ptr(compat_uptr_t uptr)
128 {
129         return (void __user *)(unsigned long)uptr;
130 }
131
132 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
133 {
134         return (u32)(unsigned long)uptr;
135 }
136
137 static inline void __user *arch_compat_alloc_user_space(long len)
138 {
139         struct pt_regs *regs = current->thread.regs;
140         unsigned long usp = regs->gpr[1];
141
142         /*
143          * We cant access below the stack pointer in the 32bit ABI and
144          * can access 288 bytes in the 64bit ABI
145          */
146         if (!(test_thread_flag(TIF_32BIT)))
147                 usp -= 288;
148
149         return (void __user *) (usp - len);
150 }
151
152 /*
153  * ipc64_perm is actually 32/64bit clean but since the compat layer refers to
154  * it we may as well define it.
155  */
156 struct compat_ipc64_perm {
157         compat_key_t key;
158         __compat_uid_t uid;
159         __compat_gid_t gid;
160         __compat_uid_t cuid;
161         __compat_gid_t cgid;
162         compat_mode_t mode;
163         unsigned int seq;
164         unsigned int __pad2;
165         unsigned long __unused1;        /* yes they really are 64bit pads */
166         unsigned long __unused2;
167 };
168
169 struct compat_semid64_ds {
170         struct compat_ipc64_perm sem_perm;
171         unsigned int __unused1;
172         compat_time_t sem_otime;
173         unsigned int __unused2;
174         compat_time_t sem_ctime;
175         compat_ulong_t sem_nsems;
176         compat_ulong_t __unused3;
177         compat_ulong_t __unused4;
178 };
179
180 struct compat_msqid64_ds {
181         struct compat_ipc64_perm msg_perm;
182         unsigned int __unused1;
183         compat_time_t msg_stime;
184         unsigned int __unused2;
185         compat_time_t msg_rtime;
186         unsigned int __unused3;
187         compat_time_t msg_ctime;
188         compat_ulong_t msg_cbytes;
189         compat_ulong_t msg_qnum;
190         compat_ulong_t msg_qbytes;
191         compat_pid_t msg_lspid;
192         compat_pid_t msg_lrpid;
193         compat_ulong_t __unused4;
194         compat_ulong_t __unused5;
195 };
196
197 struct compat_shmid64_ds {
198         struct compat_ipc64_perm shm_perm;
199         unsigned int __unused1;
200         compat_time_t shm_atime;
201         unsigned int __unused2;
202         compat_time_t shm_dtime;
203         unsigned int __unused3;
204         compat_time_t shm_ctime;
205         unsigned int __unused4;
206         compat_size_t shm_segsz;
207         compat_pid_t shm_cpid;
208         compat_pid_t shm_lpid;
209         compat_ulong_t shm_nattch;
210         compat_ulong_t __unused5;
211         compat_ulong_t __unused6;
212 };
213
214 static inline int is_compat_task(void)
215 {
216         return test_thread_flag(TIF_32BIT);
217 }
218
219 #endif /* __KERNEL__ */
220 #endif /* _ASM_POWERPC_COMPAT_H */