Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebieder...
[muen/linux.git] / include / linux / compat.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_COMPAT_H
3 #define _LINUX_COMPAT_H
4 /*
5  * These are the type definitions for the architecture specific
6  * syscall compatibility layer.
7  */
8
9 #include <linux/types.h>
10
11 #ifdef CONFIG_COMPAT
12
13 #include <linux/stat.h>
14 #include <linux/param.h>        /* for HZ */
15 #include <linux/sem.h>
16 #include <linux/socket.h>
17 #include <linux/if.h>
18 #include <linux/fs.h>
19 #include <linux/aio_abi.h>      /* for aio_context_t */
20 #include <linux/uaccess.h>
21 #include <linux/unistd.h>
22
23 #include <asm/compat.h>
24 #include <asm/siginfo.h>
25 #include <asm/signal.h>
26
27 #ifndef COMPAT_USE_64BIT_TIME
28 #define COMPAT_USE_64BIT_TIME 0
29 #endif
30
31 #ifndef __SC_DELOUSE
32 #define __SC_DELOUSE(t,v) ((__force t)(unsigned long)(v))
33 #endif
34
35 #define COMPAT_SYSCALL_DEFINE0(name) \
36         asmlinkage long compat_sys_##name(void); \
37         ALLOW_ERROR_INJECTION(compat_sys_##name, ERRNO); \
38         asmlinkage long compat_sys_##name(void)
39
40 #define COMPAT_SYSCALL_DEFINE1(name, ...) \
41         COMPAT_SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
42 #define COMPAT_SYSCALL_DEFINE2(name, ...) \
43         COMPAT_SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)
44 #define COMPAT_SYSCALL_DEFINE3(name, ...) \
45         COMPAT_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
46 #define COMPAT_SYSCALL_DEFINE4(name, ...) \
47         COMPAT_SYSCALL_DEFINEx(4, _##name, __VA_ARGS__)
48 #define COMPAT_SYSCALL_DEFINE5(name, ...) \
49         COMPAT_SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)
50 #define COMPAT_SYSCALL_DEFINE6(name, ...) \
51         COMPAT_SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
52
53 #define COMPAT_SYSCALL_DEFINEx(x, name, ...)                            \
54         asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
55         asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))\
56                 __attribute__((alias(__stringify(compat_SyS##name))));  \
57         ALLOW_ERROR_INJECTION(compat_sys##name, ERRNO); \
58         static inline long C_SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
59         asmlinkage long compat_SyS##name(__MAP(x,__SC_LONG,__VA_ARGS__));\
60         asmlinkage long compat_SyS##name(__MAP(x,__SC_LONG,__VA_ARGS__))\
61         {                                                               \
62                 return C_SYSC##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__)); \
63         }                                                               \
64         static inline long C_SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__))
65
66 #ifndef compat_user_stack_pointer
67 #define compat_user_stack_pointer() current_user_stack_pointer()
68 #endif
69 #ifndef compat_sigaltstack      /* we'll need that for MIPS */
70 typedef struct compat_sigaltstack {
71         compat_uptr_t                   ss_sp;
72         int                             ss_flags;
73         compat_size_t                   ss_size;
74 } compat_stack_t;
75 #endif
76
77 #define compat_jiffies_to_clock_t(x)    \
78                 (((unsigned long)(x) * COMPAT_USER_HZ) / HZ)
79
80 typedef __compat_uid32_t        compat_uid_t;
81 typedef __compat_gid32_t        compat_gid_t;
82
83 typedef compat_ulong_t          compat_aio_context_t;
84
85 struct compat_sel_arg_struct;
86 struct rusage;
87
88 struct compat_itimerspec {
89         struct compat_timespec it_interval;
90         struct compat_timespec it_value;
91 };
92
93 struct compat_utimbuf {
94         compat_time_t           actime;
95         compat_time_t           modtime;
96 };
97
98 struct compat_itimerval {
99         struct compat_timeval   it_interval;
100         struct compat_timeval   it_value;
101 };
102
103 struct itimerval;
104 int get_compat_itimerval(struct itimerval *, const struct compat_itimerval __user *);
105 int put_compat_itimerval(struct compat_itimerval __user *, const struct itimerval *);
106
107 struct compat_tms {
108         compat_clock_t          tms_utime;
109         compat_clock_t          tms_stime;
110         compat_clock_t          tms_cutime;
111         compat_clock_t          tms_cstime;
112 };
113
114 struct compat_timex {
115         compat_uint_t modes;
116         compat_long_t offset;
117         compat_long_t freq;
118         compat_long_t maxerror;
119         compat_long_t esterror;
120         compat_int_t status;
121         compat_long_t constant;
122         compat_long_t precision;
123         compat_long_t tolerance;
124         struct compat_timeval time;
125         compat_long_t tick;
126         compat_long_t ppsfreq;
127         compat_long_t jitter;
128         compat_int_t shift;
129         compat_long_t stabil;
130         compat_long_t jitcnt;
131         compat_long_t calcnt;
132         compat_long_t errcnt;
133         compat_long_t stbcnt;
134         compat_int_t tai;
135
136         compat_int_t:32; compat_int_t:32; compat_int_t:32; compat_int_t:32;
137         compat_int_t:32; compat_int_t:32; compat_int_t:32; compat_int_t:32;
138         compat_int_t:32; compat_int_t:32; compat_int_t:32;
139 };
140
141 struct timex;
142 int compat_get_timex(struct timex *, const struct compat_timex __user *);
143 int compat_put_timex(struct compat_timex __user *, const struct timex *);
144
145 #define _COMPAT_NSIG_WORDS      (_COMPAT_NSIG / _COMPAT_NSIG_BPW)
146
147 typedef struct {
148         compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
149 } compat_sigset_t;
150
151 struct compat_sigaction {
152 #ifndef __ARCH_HAS_IRIX_SIGACTION
153         compat_uptr_t                   sa_handler;
154         compat_ulong_t                  sa_flags;
155 #else
156         compat_uint_t                   sa_flags;
157         compat_uptr_t                   sa_handler;
158 #endif
159 #ifdef __ARCH_HAS_SA_RESTORER
160         compat_uptr_t                   sa_restorer;
161 #endif
162         compat_sigset_t                 sa_mask __packed;
163 };
164
165 typedef union compat_sigval {
166         compat_int_t    sival_int;
167         compat_uptr_t   sival_ptr;
168 } compat_sigval_t;
169
170 typedef struct compat_siginfo {
171         int si_signo;
172 #ifndef __ARCH_HAS_SWAPPED_SIGINFO
173         int si_errno;
174         int si_code;
175 #else
176         int si_code;
177         int si_errno;
178 #endif
179
180         union {
181                 int _pad[128/sizeof(int) - 3];
182
183                 /* kill() */
184                 struct {
185                         compat_pid_t _pid;      /* sender's pid */
186                         __compat_uid32_t _uid;  /* sender's uid */
187                 } _kill;
188
189                 /* POSIX.1b timers */
190                 struct {
191                         compat_timer_t _tid;    /* timer id */
192                         int _overrun;           /* overrun count */
193                         compat_sigval_t _sigval;        /* same as below */
194                 } _timer;
195
196                 /* POSIX.1b signals */
197                 struct {
198                         compat_pid_t _pid;      /* sender's pid */
199                         __compat_uid32_t _uid;  /* sender's uid */
200                         compat_sigval_t _sigval;
201                 } _rt;
202
203                 /* SIGCHLD */
204                 struct {
205                         compat_pid_t _pid;      /* which child */
206                         __compat_uid32_t _uid;  /* sender's uid */
207                         int _status;            /* exit code */
208                         compat_clock_t _utime;
209                         compat_clock_t _stime;
210                 } _sigchld;
211
212 #ifdef CONFIG_X86_X32_ABI
213                 /* SIGCHLD (x32 version) */
214                 struct {
215                         compat_pid_t _pid;      /* which child */
216                         __compat_uid32_t _uid;  /* sender's uid */
217                         int _status;            /* exit code */
218                         compat_s64 _utime;
219                         compat_s64 _stime;
220                 } _sigchld_x32;
221 #endif
222
223                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
224                 struct {
225                         compat_uptr_t _addr;    /* faulting insn/memory ref. */
226 #ifdef __ARCH_SI_TRAPNO
227                         int _trapno;    /* TRAP # which caused the signal */
228 #endif
229 #define __COMPAT_ADDR_BND_PKEY_PAD  (__alignof__(compat_uptr_t) < sizeof(short) ? \
230                                      sizeof(short) : __alignof__(compat_uptr_t))
231                         union {
232                                 /*
233                                  * used when si_code=BUS_MCEERR_AR or
234                                  * used when si_code=BUS_MCEERR_AO
235                                  */
236                                 short int _addr_lsb;    /* Valid LSB of the reported address. */
237                                 /* used when si_code=SEGV_BNDERR */
238                                 struct {
239                                         char _dummy_bnd[__COMPAT_ADDR_BND_PKEY_PAD];
240                                         compat_uptr_t _lower;
241                                         compat_uptr_t _upper;
242                                 } _addr_bnd;
243                                 /* used when si_code=SEGV_PKUERR */
244                                 struct {
245                                         char _dummy_pkey[__COMPAT_ADDR_BND_PKEY_PAD];
246                                         u32 _pkey;
247                                 } _addr_pkey;
248                         };
249                 } _sigfault;
250
251                 /* SIGPOLL */
252                 struct {
253                         compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
254                         int _fd;
255                 } _sigpoll;
256
257                 struct {
258                         compat_uptr_t _call_addr; /* calling user insn */
259                         int _syscall;   /* triggering system call number */
260                         unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
261                 } _sigsys;
262         } _sifields;
263 } compat_siginfo_t;
264
265 /*
266  * These functions operate on 32- or 64-bit specs depending on
267  * COMPAT_USE_64BIT_TIME, hence the void user pointer arguments.
268  */
269 extern int compat_get_timespec(struct timespec *, const void __user *);
270 extern int compat_put_timespec(const struct timespec *, void __user *);
271 extern int compat_get_timeval(struct timeval *, const void __user *);
272 extern int compat_put_timeval(const struct timeval *, void __user *);
273 extern int compat_get_timespec64(struct timespec64 *, const void __user *);
274 extern int compat_put_timespec64(const struct timespec64 *, void __user *);
275 extern int get_compat_itimerspec64(struct itimerspec64 *its,
276                         const struct compat_itimerspec __user *uits);
277 extern int put_compat_itimerspec64(const struct itimerspec64 *its,
278                         struct compat_itimerspec __user *uits);
279
280 struct compat_iovec {
281         compat_uptr_t   iov_base;
282         compat_size_t   iov_len;
283 };
284
285 struct compat_rlimit {
286         compat_ulong_t  rlim_cur;
287         compat_ulong_t  rlim_max;
288 };
289
290 struct compat_rusage {
291         struct compat_timeval ru_utime;
292         struct compat_timeval ru_stime;
293         compat_long_t   ru_maxrss;
294         compat_long_t   ru_ixrss;
295         compat_long_t   ru_idrss;
296         compat_long_t   ru_isrss;
297         compat_long_t   ru_minflt;
298         compat_long_t   ru_majflt;
299         compat_long_t   ru_nswap;
300         compat_long_t   ru_inblock;
301         compat_long_t   ru_oublock;
302         compat_long_t   ru_msgsnd;
303         compat_long_t   ru_msgrcv;
304         compat_long_t   ru_nsignals;
305         compat_long_t   ru_nvcsw;
306         compat_long_t   ru_nivcsw;
307 };
308
309 extern int put_compat_rusage(const struct rusage *,
310                              struct compat_rusage __user *);
311
312 struct compat_siginfo;
313
314 struct compat_dirent {
315         u32             d_ino;
316         compat_off_t    d_off;
317         u16             d_reclen;
318         char            d_name[256];
319 };
320
321 struct compat_ustat {
322         compat_daddr_t          f_tfree;
323         compat_ino_t            f_tinode;
324         char                    f_fname[6];
325         char                    f_fpack[6];
326 };
327
328 #define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
329
330 typedef struct compat_sigevent {
331         compat_sigval_t sigev_value;
332         compat_int_t sigev_signo;
333         compat_int_t sigev_notify;
334         union {
335                 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
336                 compat_int_t _tid;
337
338                 struct {
339                         compat_uptr_t _function;
340                         compat_uptr_t _attribute;
341                 } _sigev_thread;
342         } _sigev_un;
343 } compat_sigevent_t;
344
345 struct compat_ifmap {
346         compat_ulong_t mem_start;
347         compat_ulong_t mem_end;
348         unsigned short base_addr;
349         unsigned char irq;
350         unsigned char dma;
351         unsigned char port;
352 };
353
354 struct compat_if_settings {
355         unsigned int type;      /* Type of physical device or protocol */
356         unsigned int size;      /* Size of the data allocated by the caller */
357         compat_uptr_t ifs_ifsu; /* union of pointers */
358 };
359
360 struct compat_ifreq {
361         union {
362                 char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
363         } ifr_ifrn;
364         union {
365                 struct  sockaddr ifru_addr;
366                 struct  sockaddr ifru_dstaddr;
367                 struct  sockaddr ifru_broadaddr;
368                 struct  sockaddr ifru_netmask;
369                 struct  sockaddr ifru_hwaddr;
370                 short   ifru_flags;
371                 compat_int_t    ifru_ivalue;
372                 compat_int_t    ifru_mtu;
373                 struct  compat_ifmap ifru_map;
374                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
375                 char    ifru_newname[IFNAMSIZ];
376                 compat_caddr_t  ifru_data;
377                 struct  compat_if_settings ifru_settings;
378         } ifr_ifru;
379 };
380
381 struct compat_ifconf {
382         compat_int_t    ifc_len;                /* size of buffer */
383         compat_caddr_t  ifcbuf;
384 };
385
386 struct compat_robust_list {
387         compat_uptr_t                   next;
388 };
389
390 struct compat_robust_list_head {
391         struct compat_robust_list       list;
392         compat_long_t                   futex_offset;
393         compat_uptr_t                   list_op_pending;
394 };
395
396 #ifdef CONFIG_COMPAT_OLD_SIGACTION
397 struct compat_old_sigaction {
398         compat_uptr_t                   sa_handler;
399         compat_old_sigset_t             sa_mask;
400         compat_ulong_t                  sa_flags;
401         compat_uptr_t                   sa_restorer;
402 };
403 #endif
404
405 struct compat_keyctl_kdf_params {
406         compat_uptr_t hashname;
407         compat_uptr_t otherinfo;
408         __u32 otherinfolen;
409         __u32 __spare[8];
410 };
411
412 struct compat_statfs;
413 struct compat_statfs64;
414 struct compat_old_linux_dirent;
415 struct compat_linux_dirent;
416 struct linux_dirent64;
417 struct compat_msghdr;
418 struct compat_mmsghdr;
419 struct compat_sysinfo;
420 struct compat_sysctl_args;
421 struct compat_kexec_segment;
422 struct compat_mq_attr;
423 struct compat_msgbuf;
424
425 extern void compat_exit_robust_list(struct task_struct *curr);
426
427 #define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
428
429 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
430
431 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
432                        unsigned long bitmap_size);
433 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
434                        unsigned long bitmap_size);
435 int copy_siginfo_from_user32(siginfo_t *to, const struct compat_siginfo __user *from);
436 int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *from);
437 int get_compat_sigevent(struct sigevent *event,
438                 const struct compat_sigevent __user *u_event);
439
440 static inline int compat_timeval_compare(struct compat_timeval *lhs,
441                                         struct compat_timeval *rhs)
442 {
443         if (lhs->tv_sec < rhs->tv_sec)
444                 return -1;
445         if (lhs->tv_sec > rhs->tv_sec)
446                 return 1;
447         return lhs->tv_usec - rhs->tv_usec;
448 }
449
450 static inline int compat_timespec_compare(struct compat_timespec *lhs,
451                                         struct compat_timespec *rhs)
452 {
453         if (lhs->tv_sec < rhs->tv_sec)
454                 return -1;
455         if (lhs->tv_sec > rhs->tv_sec)
456                 return 1;
457         return lhs->tv_nsec - rhs->tv_nsec;
458 }
459
460 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
461
462 /*
463  * Defined inline such that size can be compile time constant, which avoids
464  * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
465  */
466 static inline int
467 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
468                   unsigned int size)
469 {
470         /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
471 #ifdef __BIG_ENDIAN
472         compat_sigset_t v;
473         switch (_NSIG_WORDS) {
474         case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
475         case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
476         case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
477         case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
478         }
479         return copy_to_user(compat, &v, size) ? -EFAULT : 0;
480 #else
481         return copy_to_user(compat, set, size) ? -EFAULT : 0;
482 #endif
483 }
484
485 extern int compat_ptrace_request(struct task_struct *child,
486                                  compat_long_t request,
487                                  compat_ulong_t addr, compat_ulong_t data);
488
489 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
490                                compat_ulong_t addr, compat_ulong_t data);
491
492 struct epoll_event;     /* fortunately, this one is fixed-layout */
493
494 extern ssize_t compat_rw_copy_check_uvector(int type,
495                 const struct compat_iovec __user *uvector,
496                 unsigned long nr_segs,
497                 unsigned long fast_segs, struct iovec *fast_pointer,
498                 struct iovec **ret_pointer);
499
500 extern void __user *compat_alloc_user_space(unsigned long len);
501
502 int compat_restore_altstack(const compat_stack_t __user *uss);
503 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
504 #define compat_save_altstack_ex(uss, sp) do { \
505         compat_stack_t __user *__uss = uss; \
506         struct task_struct *t = current; \
507         put_user_ex(ptr_to_compat((void __user *)t->sas_ss_sp), &__uss->ss_sp); \
508         put_user_ex(t->sas_ss_flags, &__uss->ss_flags); \
509         put_user_ex(t->sas_ss_size, &__uss->ss_size); \
510         if (t->sas_ss_flags & SS_AUTODISARM) \
511                 sas_ss_reset(t); \
512 } while (0);
513
514 /*
515  * These syscall function prototypes are kept in the same order as
516  * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
517  * go below.
518  *
519  * Please note that these prototypes here are only provided for information
520  * purposes, for static analysis, and for linking from the syscall table.
521  * These functions should not be called elsewhere from kernel code.
522  */
523 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
524 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
525                                      u32 __user *iocb);
526 asmlinkage long compat_sys_io_getevents(compat_aio_context_t ctx_id,
527                                         compat_long_t min_nr,
528                                         compat_long_t nr,
529                                         struct io_event __user *events,
530                                         struct compat_timespec __user *timeout);
531
532 /* fs/cookies.c */
533 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
534
535 /* fs/eventpoll.c */
536 asmlinkage long compat_sys_epoll_pwait(int epfd,
537                         struct epoll_event __user *events,
538                         int maxevents, int timeout,
539                         const compat_sigset_t __user *sigmask,
540                         compat_size_t sigsetsize);
541
542 /* fs/fcntl.c */
543 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
544                                  compat_ulong_t arg);
545 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
546                                    compat_ulong_t arg);
547
548 /* fs/ioctl.c */
549 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
550                                  compat_ulong_t arg);
551
552 /* fs/namespace.c */
553 asmlinkage long compat_sys_mount(const char __user *dev_name,
554                                  const char __user *dir_name,
555                                  const char __user *type, compat_ulong_t flags,
556                                  const void __user *data);
557
558 /* fs/open.c */
559 asmlinkage long compat_sys_statfs(const char __user *pathname,
560                                   struct compat_statfs __user *buf);
561 asmlinkage long compat_sys_statfs64(const char __user *pathname,
562                                     compat_size_t sz,
563                                     struct compat_statfs64 __user *buf);
564 asmlinkage long compat_sys_fstatfs(unsigned int fd,
565                                    struct compat_statfs __user *buf);
566 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
567                                      struct compat_statfs64 __user *buf);
568 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
569 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
570 /* No generic prototype for truncate64, ftruncate64, fallocate */
571 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
572                                   int flags, umode_t mode);
573
574 /* fs/readdir.c */
575 asmlinkage long compat_sys_getdents(unsigned int fd,
576                                     struct compat_linux_dirent __user *dirent,
577                                     unsigned int count);
578
579 /* fs/read_write.c */
580 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
581 asmlinkage ssize_t compat_sys_readv(compat_ulong_t fd,
582                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
583 asmlinkage ssize_t compat_sys_writev(compat_ulong_t fd,
584                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
585 /* No generic prototype for pread64 and pwrite64 */
586 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
587                 const struct compat_iovec __user *vec,
588                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
589 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
590                 const struct compat_iovec __user *vec,
591                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
592 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
593 asmlinkage long compat_sys_preadv64(unsigned long fd,
594                 const struct compat_iovec __user *vec,
595                 unsigned long vlen, loff_t pos);
596 #endif
597
598 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
599 asmlinkage long compat_sys_pwritev64(unsigned long fd,
600                 const struct compat_iovec __user *vec,
601                 unsigned long vlen, loff_t pos);
602 #endif
603
604 /* fs/sendfile.c */
605 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
606                                     compat_off_t __user *offset, compat_size_t count);
607 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
608                                     compat_loff_t __user *offset, compat_size_t count);
609
610 /* fs/select.c */
611 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
612                                     compat_ulong_t __user *outp,
613                                     compat_ulong_t __user *exp,
614                                     struct compat_timespec __user *tsp,
615                                     void __user *sig);
616 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
617                                  unsigned int nfds,
618                                  struct compat_timespec __user *tsp,
619                                  const compat_sigset_t __user *sigmask,
620                                  compat_size_t sigsetsize);
621
622 /* fs/signalfd.c */
623 asmlinkage long compat_sys_signalfd4(int ufd,
624                                      const compat_sigset_t __user *sigmask,
625                                      compat_size_t sigsetsize, int flags);
626
627 /* fs/splice.c */
628 asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *,
629                                     unsigned int nr_segs, unsigned int flags);
630
631 /* fs/stat.c */
632 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
633                                       const char __user *filename,
634                                       struct compat_stat __user *statbuf,
635                                       int flag);
636 asmlinkage long compat_sys_newfstat(unsigned int fd,
637                                     struct compat_stat __user *statbuf);
638
639 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
640
641 /* fs/timerfd.c */
642 asmlinkage long compat_sys_timerfd_gettime(int ufd,
643                                    struct compat_itimerspec __user *otmr);
644 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
645                                    const struct compat_itimerspec __user *utmr,
646                                    struct compat_itimerspec __user *otmr);
647
648 /* fs/utimes.c */
649 asmlinkage long compat_sys_utimensat(unsigned int dfd,
650                                      const char __user *filename,
651                                      struct compat_timespec __user *t,
652                                      int flags);
653
654 /* kernel/exit.c */
655 asmlinkage long compat_sys_waitid(int, compat_pid_t,
656                 struct compat_siginfo __user *, int,
657                 struct compat_rusage __user *);
658
659
660
661 /* kernel/futex.c */
662 asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, u32 val,
663                 struct compat_timespec __user *utime, u32 __user *uaddr2,
664                 u32 val3);
665 asmlinkage long
666 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
667                            compat_size_t len);
668 asmlinkage long
669 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
670                            compat_size_t __user *len_ptr);
671
672 /* kernel/hrtimer.c */
673 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
674                                      struct compat_timespec __user *rmtp);
675
676 /* kernel/itimer.c */
677 asmlinkage long compat_sys_getitimer(int which,
678                                      struct compat_itimerval __user *it);
679 asmlinkage long compat_sys_setitimer(int which,
680                                      struct compat_itimerval __user *in,
681                                      struct compat_itimerval __user *out);
682
683 /* kernel/kexec.c */
684 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
685                                       compat_ulong_t nr_segments,
686                                       struct compat_kexec_segment __user *,
687                                       compat_ulong_t flags);
688
689 /* kernel/posix-timers.c */
690 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
691                         struct compat_sigevent __user *timer_event_spec,
692                         timer_t __user *created_timer_id);
693 asmlinkage long compat_sys_timer_gettime(timer_t timer_id,
694                                  struct compat_itimerspec __user *setting);
695 asmlinkage long compat_sys_timer_settime(timer_t timer_id, int flags,
696                                          struct compat_itimerspec __user *new,
697                                          struct compat_itimerspec __user *old);
698 asmlinkage long compat_sys_clock_settime(clockid_t which_clock,
699                                          struct compat_timespec __user *tp);
700 asmlinkage long compat_sys_clock_gettime(clockid_t which_clock,
701                                          struct compat_timespec __user *tp);
702 asmlinkage long compat_sys_clock_getres(clockid_t which_clock,
703                                         struct compat_timespec __user *tp);
704 asmlinkage long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
705                                            struct compat_timespec __user *rqtp,
706                                            struct compat_timespec __user *rmtp);
707
708 /* kernel/ptrace.c */
709 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
710                                   compat_long_t addr, compat_long_t data);
711
712 /* kernel/sched/core.c */
713 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
714                                      unsigned int len,
715                                      compat_ulong_t __user *user_mask_ptr);
716 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
717                                      unsigned int len,
718                                      compat_ulong_t __user *user_mask_ptr);
719 asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid,
720                                                  struct compat_timespec __user *interval);
721
722 /* kernel/signal.c */
723 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
724                                        compat_stack_t __user *uoss_ptr);
725 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
726                                          compat_size_t sigsetsize);
727 #ifndef CONFIG_ODD_RT_SIGACTION
728 asmlinkage long compat_sys_rt_sigaction(int,
729                                  const struct compat_sigaction __user *,
730                                  struct compat_sigaction __user *,
731                                  compat_size_t);
732 #endif
733 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
734                                           compat_sigset_t __user *oset,
735                                           compat_size_t sigsetsize);
736 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
737                                          compat_size_t sigsetsize);
738 asmlinkage long compat_sys_rt_sigtimedwait(compat_sigset_t __user *uthese,
739                 struct compat_siginfo __user *uinfo,
740                 struct compat_timespec __user *uts, compat_size_t sigsetsize);
741 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
742                                 struct compat_siginfo __user *uinfo);
743 /* No generic prototype for rt_sigreturn */
744
745 /* kernel/sys.c */
746 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
747 asmlinkage long compat_sys_getrlimit(unsigned int resource,
748                                      struct compat_rlimit __user *rlim);
749 asmlinkage long compat_sys_setrlimit(unsigned int resource,
750                                      struct compat_rlimit __user *rlim);
751 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
752
753 /* kernel/time.c */
754 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
755                 struct timezone __user *tz);
756 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
757                 struct timezone __user *tz);
758 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp);
759
760 /* kernel/timer.c */
761 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
762
763 /* ipc/mqueue.c */
764 asmlinkage long compat_sys_mq_open(const char __user *u_name,
765                         int oflag, compat_mode_t mode,
766                         struct compat_mq_attr __user *u_attr);
767 asmlinkage long compat_sys_mq_timedsend(mqd_t mqdes,
768                         const char __user *u_msg_ptr,
769                         compat_size_t msg_len, unsigned int msg_prio,
770                         const struct compat_timespec __user *u_abs_timeout);
771 asmlinkage ssize_t compat_sys_mq_timedreceive(mqd_t mqdes,
772                         char __user *u_msg_ptr,
773                         compat_size_t msg_len, unsigned int __user *u_msg_prio,
774                         const struct compat_timespec __user *u_abs_timeout);
775 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
776                         const struct compat_sigevent __user *u_notification);
777 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
778                         const struct compat_mq_attr __user *u_mqstat,
779                         struct compat_mq_attr __user *u_omqstat);
780
781 /* ipc/msg.c */
782 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
783 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
784                 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
785 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
786                 compat_ssize_t msgsz, int msgflg);
787
788 /* ipc/sem.c */
789 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
790 asmlinkage long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
791                 unsigned nsems, const struct compat_timespec __user *timeout);
792
793 /* ipc/shm.c */
794 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
795 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
796
797 /* net/socket.c */
798 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
799                             unsigned flags, struct sockaddr __user *addr,
800                             int __user *addrlen);
801 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
802                                       char __user *optval, unsigned int optlen);
803 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
804                                       char __user *optval, int __user *optlen);
805 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
806                                    unsigned flags);
807 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
808                                    unsigned int flags);
809
810 /* mm/filemap.c: No generic prototype for readahead */
811
812 /* security/keys/keyctl.c */
813 asmlinkage long compat_sys_keyctl(u32 option,
814                               u32 arg2, u32 arg3, u32 arg4, u32 arg5);
815
816 /* arch/example/kernel/sys_example.c */
817 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
818                      const compat_uptr_t __user *envp);
819
820 /* mm/fadvise.c: No generic prototype for fadvise64_64 */
821
822 /* mm/, CONFIG_MMU only */
823 asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
824                                  compat_ulong_t mode,
825                                  compat_ulong_t __user *nmask,
826                                  compat_ulong_t maxnode, compat_ulong_t flags);
827 asmlinkage long compat_sys_get_mempolicy(int __user *policy,
828                                          compat_ulong_t __user *nmask,
829                                          compat_ulong_t maxnode,
830                                          compat_ulong_t addr,
831                                          compat_ulong_t flags);
832 asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask,
833                                          compat_ulong_t maxnode);
834 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
835                 compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
836                 const compat_ulong_t __user *new_nodes);
837 asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages,
838                                       __u32 __user *pages,
839                                       const int __user *nodes,
840                                       int __user *status,
841                                       int flags);
842
843 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
844                                         compat_pid_t pid, int sig,
845                                         struct compat_siginfo __user *uinfo);
846 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
847                                     unsigned vlen, unsigned int flags,
848                                     struct compat_timespec __user *timeout);
849 asmlinkage long compat_sys_wait4(compat_pid_t pid,
850                                  compat_uint_t __user *stat_addr, int options,
851                                  struct compat_rusage __user *ru);
852 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
853                                             int, const char __user *);
854 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
855                                              struct file_handle __user *handle,
856                                              int flags);
857 asmlinkage long compat_sys_clock_adjtime(clockid_t which_clock,
858                                          struct compat_timex __user *tp);
859 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
860                                     unsigned vlen, unsigned int flags);
861 asmlinkage ssize_t compat_sys_process_vm_readv(compat_pid_t pid,
862                 const struct compat_iovec __user *lvec,
863                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
864                 compat_ulong_t riovcnt, compat_ulong_t flags);
865 asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
866                 const struct compat_iovec __user *lvec,
867                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
868                 compat_ulong_t riovcnt, compat_ulong_t flags);
869 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
870                      const compat_uptr_t __user *argv,
871                      const compat_uptr_t __user *envp, int flags);
872 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
873                 const struct compat_iovec __user *vec,
874                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
875 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
876                 const struct compat_iovec __user *vec,
877                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
878 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
879 asmlinkage long  compat_sys_readv64v2(unsigned long fd,
880                 const struct compat_iovec __user *vec,
881                 unsigned long vlen, loff_t pos, rwf_t flags);
882 #endif
883
884 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
885 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
886                 const struct compat_iovec __user *vec,
887                 unsigned long vlen, loff_t pos, rwf_t flags);
888 #endif
889
890
891 /*
892  * Deprecated system calls which are still defined in
893  * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
894  */
895
896 /* __ARCH_WANT_SYSCALL_NO_AT */
897 asmlinkage long compat_sys_open(const char __user *filename, int flags,
898                                 umode_t mode);
899 asmlinkage long compat_sys_utimes(const char __user *filename,
900                                   struct compat_timeval __user *t);
901
902 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
903 asmlinkage long compat_sys_signalfd(int ufd,
904                                     const compat_sigset_t __user *sigmask,
905                                     compat_size_t sigsetsize);
906
907 /* __ARCH_WANT_SYSCALL_OFF_T */
908 asmlinkage long compat_sys_newstat(const char __user *filename,
909                                    struct compat_stat __user *statbuf);
910 asmlinkage long compat_sys_newlstat(const char __user *filename,
911                                     struct compat_stat __user *statbuf);
912
913 /* __ARCH_WANT_SYSCALL_DEPRECATED */
914 asmlinkage long compat_sys_time(compat_time_t __user *tloc);
915 asmlinkage long compat_sys_utime(const char __user *filename,
916                                  struct compat_utimbuf __user *t);
917 asmlinkage long compat_sys_futimesat(unsigned int dfd,
918                                      const char __user *filename,
919                                      struct compat_timeval __user *t);
920 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
921                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
922                 struct compat_timeval __user *tvp);
923 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
924 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
925                                 unsigned flags);
926 asmlinkage long compat_sys_sysctl(struct compat_sysctl_args __user *args);
927
928 /* obsolete: fs/readdir.c */
929 asmlinkage long compat_sys_old_readdir(unsigned int fd,
930                                        struct compat_old_linux_dirent __user *,
931                                        unsigned int count);
932
933 /* obsolete: fs/select.c */
934 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
935
936 /* obsolete: ipc */
937 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
938
939 /* obsolete: kernel/signal.c */
940 #ifdef __ARCH_WANT_SYS_SIGPENDING
941 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
942 #endif
943
944 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
945 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
946                                        compat_old_sigset_t __user *oset);
947 #endif
948 #ifdef CONFIG_COMPAT_OLD_SIGACTION
949 asmlinkage long compat_sys_sigaction(int sig,
950                                    const struct compat_old_sigaction __user *act,
951                                    struct compat_old_sigaction __user *oact);
952 #endif
953
954 /* obsolete: kernel/time/time.c */
955 asmlinkage long compat_sys_stime(compat_time_t __user *tptr);
956
957 /* obsolete: net/socket.c */
958 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
959
960
961 /*
962  * For most but not all architectures, "am I in a compat syscall?" and
963  * "am I a compat task?" are the same question.  For architectures on which
964  * they aren't the same question, arch code can override in_compat_syscall.
965  */
966
967 #ifndef in_compat_syscall
968 static inline bool in_compat_syscall(void) { return is_compat_task(); }
969 #endif
970
971 /**
972  * ns_to_compat_timeval - Compat version of ns_to_timeval
973  * @nsec:       the nanoseconds value to be converted
974  *
975  * Returns the compat_timeval representation of the nsec parameter.
976  */
977 static inline struct compat_timeval ns_to_compat_timeval(s64 nsec)
978 {
979         struct timeval tv;
980         struct compat_timeval ctv;
981
982         tv = ns_to_timeval(nsec);
983         ctv.tv_sec = tv.tv_sec;
984         ctv.tv_usec = tv.tv_usec;
985
986         return ctv;
987 }
988
989 #else /* !CONFIG_COMPAT */
990
991 #define is_compat_task() (0)
992 static inline bool in_compat_syscall(void) { return false; }
993
994 #endif /* CONFIG_COMPAT */
995
996 #endif /* _LINUX_COMPAT_H */