xref: /openbmc/linux/arch/powerpc/include/asm/compat.h (revision 98ddec80)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_COMPAT_H
3 #define _ASM_POWERPC_COMPAT_H
4 #ifdef __KERNEL__
5 /*
6  * Architecture specific compatibility types
7  */
8 #include <linux/types.h>
9 #include <linux/sched.h>
10 
11 #define COMPAT_USER_HZ		100
12 #ifdef __BIG_ENDIAN__
13 #define COMPAT_UTS_MACHINE	"ppc\0\0"
14 #else
15 #define COMPAT_UTS_MACHINE	"ppcle\0\0"
16 #endif
17 
18 typedef u32		compat_size_t;
19 typedef s32		compat_ssize_t;
20 typedef s32		compat_clock_t;
21 typedef s32		compat_pid_t;
22 typedef u32		__compat_uid_t;
23 typedef u32		__compat_gid_t;
24 typedef u32		__compat_uid32_t;
25 typedef u32		__compat_gid32_t;
26 typedef u32		compat_mode_t;
27 typedef u32		compat_ino_t;
28 typedef u32		compat_dev_t;
29 typedef s32		compat_off_t;
30 typedef s64		compat_loff_t;
31 typedef s16		compat_nlink_t;
32 typedef u16		compat_ipc_pid_t;
33 typedef s32		compat_daddr_t;
34 typedef u32		compat_caddr_t;
35 typedef __kernel_fsid_t	compat_fsid_t;
36 typedef s32		compat_key_t;
37 typedef s32		compat_timer_t;
38 
39 typedef s32		compat_int_t;
40 typedef s32		compat_long_t;
41 typedef s64		compat_s64;
42 typedef u32		compat_uint_t;
43 typedef u32		compat_ulong_t;
44 typedef u64		compat_u64;
45 typedef u32		compat_uptr_t;
46 
47 struct compat_stat {
48 	compat_dev_t	st_dev;
49 	compat_ino_t	st_ino;
50 	compat_mode_t	st_mode;
51 	compat_nlink_t	st_nlink;
52 	__compat_uid32_t	st_uid;
53 	__compat_gid32_t	st_gid;
54 	compat_dev_t	st_rdev;
55 	compat_off_t	st_size;
56 	compat_off_t	st_blksize;
57 	compat_off_t	st_blocks;
58 	compat_time_t	st_atime;
59 	u32		st_atime_nsec;
60 	compat_time_t	st_mtime;
61 	u32		st_mtime_nsec;
62 	compat_time_t	st_ctime;
63 	u32		st_ctime_nsec;
64 	u32		__unused4[2];
65 };
66 
67 struct compat_flock {
68 	short		l_type;
69 	short		l_whence;
70 	compat_off_t	l_start;
71 	compat_off_t	l_len;
72 	compat_pid_t	l_pid;
73 };
74 
75 #define F_GETLK64	12	/*  using 'struct flock64' */
76 #define F_SETLK64	13
77 #define F_SETLKW64	14
78 
79 struct compat_flock64 {
80 	short		l_type;
81 	short		l_whence;
82 	compat_loff_t	l_start;
83 	compat_loff_t	l_len;
84 	compat_pid_t	l_pid;
85 };
86 
87 struct compat_statfs {
88 	int		f_type;
89 	int		f_bsize;
90 	int		f_blocks;
91 	int		f_bfree;
92 	int		f_bavail;
93 	int		f_files;
94 	int		f_ffree;
95 	compat_fsid_t	f_fsid;
96 	int		f_namelen;	/* SunOS ignores this field. */
97 	int		f_frsize;
98 	int		f_flags;
99 	int		f_spare[4];
100 };
101 
102 #define COMPAT_RLIM_INFINITY		0xffffffff
103 
104 typedef u32		compat_old_sigset_t;
105 
106 #define _COMPAT_NSIG		64
107 #define _COMPAT_NSIG_BPW	32
108 
109 typedef u32		compat_sigset_word;
110 
111 #define COMPAT_OFF_T_MAX	0x7fffffff
112 
113 /*
114  * A pointer passed in from user mode. This should not
115  * be used for syscall parameters, just declare them
116  * as pointers because the syscall entry code will have
117  * appropriately converted them already.
118  */
119 
120 static inline void __user *compat_ptr(compat_uptr_t uptr)
121 {
122 	return (void __user *)(unsigned long)uptr;
123 }
124 
125 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
126 {
127 	return (u32)(unsigned long)uptr;
128 }
129 
130 static inline void __user *arch_compat_alloc_user_space(long len)
131 {
132 	struct pt_regs *regs = current->thread.regs;
133 	unsigned long usp = regs->gpr[1];
134 
135 	/*
136 	 * We can't access below the stack pointer in the 32bit ABI and
137 	 * can access 288 bytes in the 64bit big-endian ABI,
138 	 * or 512 bytes with the new ELFv2 little-endian ABI.
139 	 */
140 	if (!is_32bit_task())
141 		usp -= USER_REDZONE_SIZE;
142 
143 	return (void __user *) (usp - len);
144 }
145 
146 /*
147  * ipc64_perm is actually 32/64bit clean but since the compat layer refers to
148  * it we may as well define it.
149  */
150 struct compat_ipc64_perm {
151 	compat_key_t key;
152 	__compat_uid_t uid;
153 	__compat_gid_t gid;
154 	__compat_uid_t cuid;
155 	__compat_gid_t cgid;
156 	compat_mode_t mode;
157 	unsigned int seq;
158 	unsigned int __pad2;
159 	unsigned long __unused1;	/* yes they really are 64bit pads */
160 	unsigned long __unused2;
161 };
162 
163 struct compat_semid64_ds {
164 	struct compat_ipc64_perm sem_perm;
165 	unsigned int sem_otime_high;
166 	unsigned int sem_otime;
167 	unsigned int sem_ctime_high;
168 	unsigned int sem_ctime;
169 	compat_ulong_t sem_nsems;
170 	compat_ulong_t __unused3;
171 	compat_ulong_t __unused4;
172 };
173 
174 struct compat_msqid64_ds {
175 	struct compat_ipc64_perm msg_perm;
176 	unsigned int msg_stime_high;
177 	unsigned int msg_stime;
178 	unsigned int msg_rtime_high;
179 	unsigned int msg_rtime;
180 	unsigned int msg_ctime_high;
181 	unsigned int msg_ctime;
182 	compat_ulong_t msg_cbytes;
183 	compat_ulong_t msg_qnum;
184 	compat_ulong_t msg_qbytes;
185 	compat_pid_t msg_lspid;
186 	compat_pid_t msg_lrpid;
187 	compat_ulong_t __unused4;
188 	compat_ulong_t __unused5;
189 };
190 
191 struct compat_shmid64_ds {
192 	struct compat_ipc64_perm shm_perm;
193 	unsigned int shm_atime_high;
194 	unsigned int shm_atime;
195 	unsigned int shm_dtime_high;
196 	unsigned int shm_dtime;
197 	unsigned int shm_ctime_high;
198 	unsigned int shm_ctime;
199 	unsigned int __unused4;
200 	compat_size_t shm_segsz;
201 	compat_pid_t shm_cpid;
202 	compat_pid_t shm_lpid;
203 	compat_ulong_t shm_nattch;
204 	compat_ulong_t __unused5;
205 	compat_ulong_t __unused6;
206 };
207 
208 static inline int is_compat_task(void)
209 {
210 	return is_32bit_task();
211 }
212 
213 #endif /* __KERNEL__ */
214 #endif /* _ASM_POWERPC_COMPAT_H */
215