xref: /openbmc/linux/arch/x86/include/asm/compat.h (revision 82003e04)
1 #ifndef _ASM_X86_COMPAT_H
2 #define _ASM_X86_COMPAT_H
3 
4 /*
5  * Architecture specific compatibility types
6  */
7 #include <linux/types.h>
8 #include <linux/sched.h>
9 #include <asm/processor.h>
10 #include <asm/user32.h>
11 #include <asm/unistd.h>
12 
13 #define COMPAT_USER_HZ		100
14 #define COMPAT_UTS_MACHINE	"i686\0\0"
15 
16 typedef u32		compat_size_t;
17 typedef s32		compat_ssize_t;
18 typedef s32		compat_time_t;
19 typedef s32		compat_clock_t;
20 typedef s32		compat_pid_t;
21 typedef u16		__compat_uid_t;
22 typedef u16		__compat_gid_t;
23 typedef u32		__compat_uid32_t;
24 typedef u32		__compat_gid32_t;
25 typedef u16		compat_mode_t;
26 typedef u32		compat_ino_t;
27 typedef u16		compat_dev_t;
28 typedef s32		compat_off_t;
29 typedef s64		compat_loff_t;
30 typedef u16		compat_nlink_t;
31 typedef u16		compat_ipc_pid_t;
32 typedef s32		compat_daddr_t;
33 typedef u32		compat_caddr_t;
34 typedef __kernel_fsid_t	compat_fsid_t;
35 typedef s32		compat_timer_t;
36 typedef s32		compat_key_t;
37 
38 typedef s32		compat_int_t;
39 typedef s32		compat_long_t;
40 typedef s64 __attribute__((aligned(4))) compat_s64;
41 typedef u32		compat_uint_t;
42 typedef u32		compat_ulong_t;
43 typedef u32		compat_u32;
44 typedef u64 __attribute__((aligned(4))) compat_u64;
45 typedef u32		compat_uptr_t;
46 
47 struct compat_timespec {
48 	compat_time_t	tv_sec;
49 	s32		tv_nsec;
50 };
51 
52 struct compat_timeval {
53 	compat_time_t	tv_sec;
54 	s32		tv_usec;
55 };
56 
57 struct compat_stat {
58 	compat_dev_t	st_dev;
59 	u16		__pad1;
60 	compat_ino_t	st_ino;
61 	compat_mode_t	st_mode;
62 	compat_nlink_t	st_nlink;
63 	__compat_uid_t	st_uid;
64 	__compat_gid_t	st_gid;
65 	compat_dev_t	st_rdev;
66 	u16		__pad2;
67 	u32		st_size;
68 	u32		st_blksize;
69 	u32		st_blocks;
70 	u32		st_atime;
71 	u32		st_atime_nsec;
72 	u32		st_mtime;
73 	u32		st_mtime_nsec;
74 	u32		st_ctime;
75 	u32		st_ctime_nsec;
76 	u32		__unused4;
77 	u32		__unused5;
78 };
79 
80 struct compat_flock {
81 	short		l_type;
82 	short		l_whence;
83 	compat_off_t	l_start;
84 	compat_off_t	l_len;
85 	compat_pid_t	l_pid;
86 };
87 
88 #define F_GETLK64	12	/*  using 'struct flock64' */
89 #define F_SETLK64	13
90 #define F_SETLKW64	14
91 
92 /*
93  * IA32 uses 4 byte alignment for 64 bit quantities,
94  * so we need to pack this structure.
95  */
96 struct compat_flock64 {
97 	short		l_type;
98 	short		l_whence;
99 	compat_loff_t	l_start;
100 	compat_loff_t	l_len;
101 	compat_pid_t	l_pid;
102 } __attribute__((packed));
103 
104 struct compat_statfs {
105 	int		f_type;
106 	int		f_bsize;
107 	int		f_blocks;
108 	int		f_bfree;
109 	int		f_bavail;
110 	int		f_files;
111 	int		f_ffree;
112 	compat_fsid_t	f_fsid;
113 	int		f_namelen;	/* SunOS ignores this field. */
114 	int		f_frsize;
115 	int		f_flags;
116 	int		f_spare[4];
117 };
118 
119 #define COMPAT_RLIM_OLD_INFINITY	0x7fffffff
120 #define COMPAT_RLIM_INFINITY		0xffffffff
121 
122 typedef u32		compat_old_sigset_t;	/* at least 32 bits */
123 
124 #define _COMPAT_NSIG		64
125 #define _COMPAT_NSIG_BPW	32
126 
127 typedef u32               compat_sigset_word;
128 
129 typedef union compat_sigval {
130 	compat_int_t	sival_int;
131 	compat_uptr_t	sival_ptr;
132 } compat_sigval_t;
133 
134 typedef struct compat_siginfo {
135 	int si_signo;
136 	int si_errno;
137 	int si_code;
138 
139 	union {
140 		int _pad[128/sizeof(int) - 3];
141 
142 		/* kill() */
143 		struct {
144 			unsigned int _pid;	/* sender's pid */
145 			unsigned int _uid;	/* sender's uid */
146 		} _kill;
147 
148 		/* POSIX.1b timers */
149 		struct {
150 			compat_timer_t _tid;	/* timer id */
151 			int _overrun;		/* overrun count */
152 			compat_sigval_t _sigval;	/* same as below */
153 			int _sys_private;	/* not to be passed to user */
154 			int _overrun_incr;	/* amount to add to overrun */
155 		} _timer;
156 
157 		/* POSIX.1b signals */
158 		struct {
159 			unsigned int _pid;	/* sender's pid */
160 			unsigned int _uid;	/* sender's uid */
161 			compat_sigval_t _sigval;
162 		} _rt;
163 
164 		/* SIGCHLD */
165 		struct {
166 			unsigned int _pid;	/* which child */
167 			unsigned int _uid;	/* sender's uid */
168 			int _status;		/* exit code */
169 			compat_clock_t _utime;
170 			compat_clock_t _stime;
171 		} _sigchld;
172 
173 		/* SIGCHLD (x32 version) */
174 		struct {
175 			unsigned int _pid;	/* which child */
176 			unsigned int _uid;	/* sender's uid */
177 			int _status;		/* exit code */
178 			compat_s64 _utime;
179 			compat_s64 _stime;
180 		} _sigchld_x32;
181 
182 		/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
183 		struct {
184 			unsigned int _addr;	/* faulting insn/memory ref. */
185 			short int _addr_lsb;	/* Valid LSB of the reported address. */
186 			union {
187 				/* used when si_code=SEGV_BNDERR */
188 				struct {
189 					compat_uptr_t _lower;
190 					compat_uptr_t _upper;
191 				} _addr_bnd;
192 				/* used when si_code=SEGV_PKUERR */
193 				compat_u32 _pkey;
194 			};
195 		} _sigfault;
196 
197 		/* SIGPOLL */
198 		struct {
199 			int _band;	/* POLL_IN, POLL_OUT, POLL_MSG */
200 			int _fd;
201 		} _sigpoll;
202 
203 		struct {
204 			unsigned int _call_addr; /* calling insn */
205 			int _syscall;	/* triggering system call number */
206 			unsigned int _arch;	/* AUDIT_ARCH_* of syscall */
207 		} _sigsys;
208 	} _sifields;
209 } compat_siginfo_t;
210 
211 #define COMPAT_OFF_T_MAX	0x7fffffff
212 #define COMPAT_LOFF_T_MAX	0x7fffffffffffffffL
213 
214 struct compat_ipc64_perm {
215 	compat_key_t key;
216 	__compat_uid32_t uid;
217 	__compat_gid32_t gid;
218 	__compat_uid32_t cuid;
219 	__compat_gid32_t cgid;
220 	unsigned short mode;
221 	unsigned short __pad1;
222 	unsigned short seq;
223 	unsigned short __pad2;
224 	compat_ulong_t unused1;
225 	compat_ulong_t unused2;
226 };
227 
228 struct compat_semid64_ds {
229 	struct compat_ipc64_perm sem_perm;
230 	compat_time_t  sem_otime;
231 	compat_ulong_t __unused1;
232 	compat_time_t  sem_ctime;
233 	compat_ulong_t __unused2;
234 	compat_ulong_t sem_nsems;
235 	compat_ulong_t __unused3;
236 	compat_ulong_t __unused4;
237 };
238 
239 struct compat_msqid64_ds {
240 	struct compat_ipc64_perm msg_perm;
241 	compat_time_t  msg_stime;
242 	compat_ulong_t __unused1;
243 	compat_time_t  msg_rtime;
244 	compat_ulong_t __unused2;
245 	compat_time_t  msg_ctime;
246 	compat_ulong_t __unused3;
247 	compat_ulong_t msg_cbytes;
248 	compat_ulong_t msg_qnum;
249 	compat_ulong_t msg_qbytes;
250 	compat_pid_t   msg_lspid;
251 	compat_pid_t   msg_lrpid;
252 	compat_ulong_t __unused4;
253 	compat_ulong_t __unused5;
254 };
255 
256 struct compat_shmid64_ds {
257 	struct compat_ipc64_perm shm_perm;
258 	compat_size_t  shm_segsz;
259 	compat_time_t  shm_atime;
260 	compat_ulong_t __unused1;
261 	compat_time_t  shm_dtime;
262 	compat_ulong_t __unused2;
263 	compat_time_t  shm_ctime;
264 	compat_ulong_t __unused3;
265 	compat_pid_t   shm_cpid;
266 	compat_pid_t   shm_lpid;
267 	compat_ulong_t shm_nattch;
268 	compat_ulong_t __unused4;
269 	compat_ulong_t __unused5;
270 };
271 
272 /*
273  * The type of struct elf_prstatus.pr_reg in compatible core dumps.
274  */
275 #ifdef CONFIG_X86_X32_ABI
276 typedef struct user_regs_struct compat_elf_gregset_t;
277 
278 /* Full regset -- prstatus on x32, otherwise on ia32 */
279 #define PRSTATUS_SIZE(S, R) (R != sizeof(S.pr_reg) ? 144 : 296)
280 #define SET_PR_FPVALID(S, V, R) \
281   do { *(int *) (((void *) &((S)->pr_reg)) + R) = (V); } \
282   while (0)
283 
284 #define COMPAT_USE_64BIT_TIME \
285 	(!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT))
286 #else
287 typedef struct user_regs_struct32 compat_elf_gregset_t;
288 #endif
289 
290 /*
291  * A pointer passed in from user mode. This should not
292  * be used for syscall parameters, just declare them
293  * as pointers because the syscall entry code will have
294  * appropriately converted them already.
295  */
296 
297 static inline void __user *compat_ptr(compat_uptr_t uptr)
298 {
299 	return (void __user *)(unsigned long)uptr;
300 }
301 
302 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
303 {
304 	return (u32)(unsigned long)uptr;
305 }
306 
307 static inline void __user *arch_compat_alloc_user_space(long len)
308 {
309 	compat_uptr_t sp;
310 
311 	if (test_thread_flag(TIF_IA32)) {
312 		sp = task_pt_regs(current)->sp;
313 	} else {
314 		/* -128 for the x32 ABI redzone */
315 		sp = task_pt_regs(current)->sp - 128;
316 	}
317 
318 	return (void __user *)round_down(sp - len, 16);
319 }
320 
321 static inline bool in_x32_syscall(void)
322 {
323 #ifdef CONFIG_X86_X32_ABI
324 	if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
325 		return true;
326 #endif
327 	return false;
328 }
329 
330 static inline bool in_compat_syscall(void)
331 {
332 	return in_ia32_syscall() || in_x32_syscall();
333 }
334 #define in_compat_syscall in_compat_syscall	/* override the generic impl */
335 
336 #endif /* _ASM_X86_COMPAT_H */
337