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/unistd.h>
  21
  22 #include <asm/compat.h>
  23 #include <asm/siginfo.h>
  24 #include <asm/signal.h>
  25
  26 #ifndef COMPAT_USE_64BIT_TIME
  27 #define COMPAT_USE_64BIT_TIME 0
  28 #endif
  29
  30 #ifndef __SC_DELOUSE
  31 #define __SC_DELOUSE(t,v) ((__force t)(unsigned long)(v))
  32 #endif
  33
  34 #define COMPAT_SYSCALL_DEFINE0(name) \
  35         asmlinkage long compat_sys_##name(void)
  36
  37 #define COMPAT_SYSCALL_DEFINE1(name, ...) \
  38         COMPAT_SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
  39 #define COMPAT_SYSCALL_DEFINE2(name, ...) \
  40         COMPAT_SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)
  41 #define COMPAT_SYSCALL_DEFINE3(name, ...) \
  42         COMPAT_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
  43 #define COMPAT_SYSCALL_DEFINE4(name, ...) \
  44         COMPAT_SYSCALL_DEFINEx(4, _##name, __VA_ARGS__)
  45 #define COMPAT_SYSCALL_DEFINE5(name, ...) \
  46         COMPAT_SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)
  47 #define COMPAT_SYSCALL_DEFINE6(name, ...) \
  48         COMPAT_SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
  49
  50 #define COMPAT_SYSCALL_DEFINEx(x, name, ...)                            \
  51         asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))\
  52                 __attribute__((alias(__stringify(compat_SyS##name))));  \
  53         static inline long C_SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
  54         asmlinkage long compat_SyS##name(__MAP(x,__SC_LONG,__VA_ARGS__));\
  55         asmlinkage long compat_SyS##name(__MAP(x,__SC_LONG,__VA_ARGS__))\
  56         {                                                               \
  57                 return C_SYSC##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__)); \
  58         }                                                               \
  59         static inline long C_SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__))
  60
  61 #ifndef compat_user_stack_pointer
  62 #define compat_user_stack_pointer() current_user_stack_pointer()
  63 #endif
  64 #ifndef compat_sigaltstack      /* we'll need that for MIPS */
  65 typedef struct compat_sigaltstack {
  66         compat_uptr_t                   ss_sp;
  67         int                             ss_flags;
  68         compat_size_t                   ss_size;
  69 } compat_stack_t;
  70 #endif
  71
  72 #define compat_jiffies_to_clock_t(x)    \
  73                 (((unsigned long)(x) * COMPAT_USER_HZ) / HZ)
  74
  75 typedef __compat_uid32_t        compat_uid_t;
  76 typedef __compat_gid32_t        compat_gid_t;
  77
  78 typedef compat_ulong_t          compat_aio_context_t;
  79
  80 struct compat_sel_arg_struct;
  81 struct rusage;
  82
  83 struct compat_itimerspec {
  84         struct compat_timespec it_interval;
  85         struct compat_timespec it_value;
  86 };
  87
  88 struct compat_utimbuf {
  89         compat_time_t           actime;
  90         compat_time_t           modtime;
  91 };
  92
  93 struct compat_itimerval {
  94         struct compat_timeval   it_interval;
  95         struct compat_timeval   it_value;
  96 };
  97
  98 struct itimerval;
  99 int get_compat_itimerval(struct itimerval *, const struct compat_itimerval __user *);
 100 int put_compat_itimerval(struct compat_itimerval __user *, const struct itimerval *);
 101
 102 struct compat_tms {
 103         compat_clock_t          tms_utime;
 104         compat_clock_t          tms_stime;
 105         compat_clock_t          tms_cutime;
 106         compat_clock_t          tms_cstime;
 107 };
 108
 109 struct compat_timex {
 110         compat_uint_t modes;
 111         compat_long_t offset;
 112         compat_long_t freq;
 113         compat_long_t maxerror;
 114         compat_long_t esterror;
 115         compat_int_t status;
 116         compat_long_t constant;
 117         compat_long_t precision;
 118         compat_long_t tolerance;
 119         struct compat_timeval time;
 120         compat_long_t tick;
 121         compat_long_t ppsfreq;
 122         compat_long_t jitter;
 123         compat_int_t shift;
 124         compat_long_t stabil;
 125         compat_long_t jitcnt;
 126         compat_long_t calcnt;
 127         compat_long_t errcnt;
 128         compat_long_t stbcnt;
 129         compat_int_t tai;
 130
 131         compat_int_t:32; compat_int_t:32; compat_int_t:32; compat_int_t:32;
 132         compat_int_t:32; compat_int_t:32; compat_int_t:32; compat_int_t:32;
 133         compat_int_t:32; compat_int_t:32; compat_int_t:32;
 134 };
 135
 136 struct timex;
 137 int compat_get_timex(struct timex *, const struct compat_timex __user *);
 138 int compat_put_timex(struct compat_timex __user *, const struct timex *);
 139
 140 #define _COMPAT_NSIG_WORDS      (_COMPAT_NSIG / _COMPAT_NSIG_BPW)
 141
 142 typedef struct {
 143         compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
 144 } compat_sigset_t;
 145
 146 struct compat_sigaction {
 147 #ifndef __ARCH_HAS_IRIX_SIGACTION
 148         compat_uptr_t                   sa_handler;
 149         compat_ulong_t                  sa_flags;
 150 #else
 151         compat_uint_t                   sa_flags;
 152         compat_uptr_t                   sa_handler;
 153 #endif
 154 #ifdef __ARCH_HAS_SA_RESTORER
 155         compat_uptr_t                   sa_restorer;
 156 #endif
 157         compat_sigset_t                 sa_mask __packed;
 158 };
 159
 160 /*
 161  * These functions operate on 32- or 64-bit specs depending on
 162  * COMPAT_USE_64BIT_TIME, hence the void user pointer arguments.
 163  */
 164 extern int compat_get_timespec(struct timespec *, const void __user *);
 165 extern int compat_put_timespec(const struct timespec *, void __user *);
 166 extern int compat_get_timeval(struct timeval *, const void __user *);
 167 extern int compat_put_timeval(const struct timeval *, void __user *);
 168 extern int compat_get_timespec64(struct timespec64 *, const void __user *);
 169 extern int compat_put_timespec64(const struct timespec64 *, void __user *);
 170 extern int get_compat_itimerspec64(struct itimerspec64 *its,
 171                         const struct compat_itimerspec __user *uits);
 172 extern int put_compat_itimerspec64(const struct itimerspec64 *its,
 173                         struct compat_itimerspec __user *uits);
 174
 175 struct compat_iovec {
 176         compat_uptr_t   iov_base;
 177         compat_size_t   iov_len;
 178 };
 179
 180 struct compat_rlimit {
 181         compat_ulong_t  rlim_cur;
 182         compat_ulong_t  rlim_max;
 183 };
 184
 185 struct compat_rusage {
 186         struct compat_timeval ru_utime;
 187         struct compat_timeval ru_stime;
 188         compat_long_t   ru_maxrss;
 189         compat_long_t   ru_ixrss;
 190         compat_long_t   ru_idrss;
 191         compat_long_t   ru_isrss;
 192         compat_long_t   ru_minflt;
 193         compat_long_t   ru_majflt;
 194         compat_long_t   ru_nswap;
 195         compat_long_t   ru_inblock;
 196         compat_long_t   ru_oublock;
 197         compat_long_t   ru_msgsnd;
 198         compat_long_t   ru_msgrcv;
 199         compat_long_t   ru_nsignals;
 200         compat_long_t   ru_nvcsw;
 201         compat_long_t   ru_nivcsw;
 202 };
 203
 204 extern int put_compat_rusage(const struct rusage *,
 205                              struct compat_rusage __user *);
 206
 207 struct compat_siginfo;
 208
 209 extern asmlinkage long compat_sys_waitid(int, compat_pid_t,
 210                 struct compat_siginfo __user *, int,
 211                 struct compat_rusage __user *);
 212
 213 struct compat_dirent {
 214         u32             d_ino;
 215         compat_off_t    d_off;
 216         u16             d_reclen;
 217         char            d_name[256];
 218 };
 219
 220 struct compat_ustat {
 221         compat_daddr_t          f_tfree;
 222         compat_ino_t            f_tinode;
 223         char                    f_fname[6];
 224         char                    f_fpack[6];
 225 };
 226
 227 #define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
 228
 229 typedef struct compat_sigevent {
 230         compat_sigval_t sigev_value;
 231         compat_int_t sigev_signo;
 232         compat_int_t sigev_notify;
 233         union {
 234                 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
 235                 compat_int_t _tid;
 236
 237                 struct {
 238                         compat_uptr_t _function;
 239                         compat_uptr_t _attribute;
 240                 } _sigev_thread;
 241         } _sigev_un;
 242 } compat_sigevent_t;
 243
 244 struct compat_ifmap {
 245         compat_ulong_t mem_start;
 246         compat_ulong_t mem_end;
 247         unsigned short base_addr;
 248         unsigned char irq;
 249         unsigned char dma;
 250         unsigned char port;
 251 };
 252
 253 struct compat_if_settings {
 254         unsigned int type;      /* Type of physical device or protocol */
 255         unsigned int size;      /* Size of the data allocated by the caller */
 256         compat_uptr_t ifs_ifsu; /* union of pointers */
 257 };
 258
 259 struct compat_ifreq {
 260         union {
 261                 char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
 262         } ifr_ifrn;
 263         union {
 264                 struct  sockaddr ifru_addr;
 265                 struct  sockaddr ifru_dstaddr;
 266                 struct  sockaddr ifru_broadaddr;
 267                 struct  sockaddr ifru_netmask;
 268                 struct  sockaddr ifru_hwaddr;
 269                 short   ifru_flags;
 270                 compat_int_t    ifru_ivalue;
 271                 compat_int_t    ifru_mtu;
 272                 struct  compat_ifmap ifru_map;
 273                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
 274                 char    ifru_newname[IFNAMSIZ];
 275                 compat_caddr_t  ifru_data;
 276                 struct  compat_if_settings ifru_settings;
 277         } ifr_ifru;
 278 };
 279
 280 struct compat_ifconf {
 281         compat_int_t    ifc_len;                /* size of buffer */
 282         compat_caddr_t  ifcbuf;
 283 };
 284
 285 struct compat_robust_list {
 286         compat_uptr_t                   next;
 287 };
 288
 289 struct compat_robust_list_head {
 290         struct compat_robust_list       list;
 291         compat_long_t                   futex_offset;
 292         compat_uptr_t                   list_op_pending;
 293 };
 294
 295 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 296 struct compat_old_sigaction {
 297         compat_uptr_t                   sa_handler;
 298         compat_old_sigset_t             sa_mask;
 299         compat_ulong_t                  sa_flags;
 300         compat_uptr_t                   sa_restorer;
 301 };
 302 #endif
 303
 304 struct compat_keyctl_kdf_params {
 305         compat_uptr_t hashname;
 306         compat_uptr_t otherinfo;
 307         __u32 otherinfolen;
 308         __u32 __spare[8];
 309 };
 310
 311 struct compat_statfs;
 312 struct compat_statfs64;
 313 struct compat_old_linux_dirent;
 314 struct compat_linux_dirent;
 315 struct linux_dirent64;
 316 struct compat_msghdr;
 317 struct compat_mmsghdr;
 318 struct compat_sysinfo;
 319 struct compat_sysctl_args;
 320 struct compat_kexec_segment;
 321 struct compat_mq_attr;
 322 struct compat_msgbuf;
 323
 324 extern void compat_exit_robust_list(struct task_struct *curr);
 325
 326 asmlinkage long
 327 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
 328                            compat_size_t len);
 329 asmlinkage long
 330 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 331                            compat_size_t __user *len_ptr);
 332
 333 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
 334 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
 335 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
 336 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
 337                 compat_ssize_t msgsz, int msgflg);
 338 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
 339                 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
 340 long compat_sys_msgctl(int first, int second, void __user *uptr);
 341 long compat_sys_shmctl(int first, int second, void __user *uptr);
 342 long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
 343                 unsigned nsems, const struct compat_timespec __user *timeout);
 344 asmlinkage long compat_sys_keyctl(u32 option,
 345                               u32 arg2, u32 arg3, u32 arg4, u32 arg5);
 346 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
 347
 348 asmlinkage ssize_t compat_sys_readv(compat_ulong_t fd,
 349                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 350 asmlinkage ssize_t compat_sys_writev(compat_ulong_t fd,
 351                 const struct compat_iovec __user *vec, compat_ulong_t vlen);
 352 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
 353                 const struct compat_iovec __user *vec,
 354                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 355 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
 356                 const struct compat_iovec __user *vec,
 357                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
 358 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
 359                 const struct compat_iovec __user *vec,
 360                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 361 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
 362                 const struct compat_iovec __user *vec,
 363                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
 364
 365 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
 366 asmlinkage long compat_sys_preadv64(unsigned long fd,
 367                 const struct compat_iovec __user *vec,
 368                 unsigned long vlen, loff_t pos);
 369 #endif
 370
 371 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
 372 asmlinkage long compat_sys_pwritev64(unsigned long fd,
 373                 const struct compat_iovec __user *vec,
 374                 unsigned long vlen, loff_t pos);
 375 #endif
 376
 377 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
 378 asmlinkage long  compat_sys_readv64v2(unsigned long fd,
 379                 const struct compat_iovec __user *vec,
 380                 unsigned long vlen, loff_t pos, rwf_t flags);
 381 #endif
 382
 383 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
 384 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
 385                 const struct compat_iovec __user *vec,
 386                 unsigned long vlen, loff_t pos, rwf_t flags);
 387 #endif
 388
 389 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
 390
 391 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
 392                      const compat_uptr_t __user *envp);
 393 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
 394                      const compat_uptr_t __user *argv,
 395                      const compat_uptr_t __user *envp, int flags);
 396
 397 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
 398                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 399                 struct compat_timeval __user *tvp);
 400
 401 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
 402
 403 asmlinkage long compat_sys_wait4(compat_pid_t pid,
 404                                  compat_uint_t __user *stat_addr, int options,
 405                                  struct compat_rusage __user *ru);
 406
 407 #define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
 408
 409 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
 410
 411 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 412                        unsigned long bitmap_size);
 413 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 414                        unsigned long bitmap_size);
 415 int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from);
 416 int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *from);
 417 int get_compat_sigevent(struct sigevent *event,
 418                 const struct compat_sigevent __user *u_event);
 419 long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
 420                                   struct compat_siginfo __user *uinfo);
 421 #ifdef CONFIG_COMPAT_OLD_SIGACTION
 422 asmlinkage long compat_sys_sigaction(int sig,
 423                                    const struct compat_old_sigaction __user *act,
 424                                    struct compat_old_sigaction __user *oact);
 425 #endif
 426
 427 static inline int compat_timeval_compare(struct compat_timeval *lhs,
 428                                         struct compat_timeval *rhs)
 429 {
 430         if (lhs->tv_sec < rhs->tv_sec)
 431                 return -1;
 432         if (lhs->tv_sec > rhs->tv_sec)
 433                 return 1;
 434         return lhs->tv_usec - rhs->tv_usec;
 435 }
 436
 437 static inline int compat_timespec_compare(struct compat_timespec *lhs,
 438                                         struct compat_timespec *rhs)
 439 {
 440         if (lhs->tv_sec < rhs->tv_sec)
 441                 return -1;
 442         if (lhs->tv_sec > rhs->tv_sec)
 443                 return 1;
 444         return lhs->tv_nsec - rhs->tv_nsec;
 445 }
 446
 447 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
 448                 struct timezone __user *tz);
 449 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
 450                 struct timezone __user *tz);
 451
 452 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp);
 453
 454 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
 455 extern int put_compat_sigset(compat_sigset_t __user *compat,
 456                              const sigset_t *set, unsigned int size);
 457
 458 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
 459                 compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
 460                 const compat_ulong_t __user *new_nodes);
 461
 462 extern int compat_ptrace_request(struct task_struct *child,
 463                                  compat_long_t request,
 464                                  compat_ulong_t addr, compat_ulong_t data);
 465
 466 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 467                                compat_ulong_t addr, compat_ulong_t data);
 468 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 469                                   compat_long_t addr, compat_long_t data);
 470
 471 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
 472 /*
 473  * epoll (fs/eventpoll.c) compat bits follow ...
 474  */
 475 struct epoll_event;     /* fortunately, this one is fixed-layout */
 476 asmlinkage long compat_sys_epoll_pwait(int epfd,
 477                         struct epoll_event __user *events,
 478                         int maxevents, int timeout,
 479                         const compat_sigset_t __user *sigmask,
 480                         compat_size_t sigsetsize);
 481
 482 asmlinkage long compat_sys_utime(const char __user *filename,
 483                                  struct compat_utimbuf __user *t);
 484 asmlinkage long compat_sys_utimensat(unsigned int dfd,
 485                                      const char __user *filename,
 486                                      struct compat_timespec __user *t,
 487                                      int flags);
 488
 489 asmlinkage long compat_sys_time(compat_time_t __user *tloc);
 490 asmlinkage long compat_sys_stime(compat_time_t __user *tptr);
 491 asmlinkage long compat_sys_signalfd(int ufd,
 492                                     const compat_sigset_t __user *sigmask,
 493                                     compat_size_t sigsetsize);
 494 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
 495                                    const struct compat_itimerspec __user *utmr,
 496                                    struct compat_itimerspec __user *otmr);
 497 asmlinkage long compat_sys_timerfd_gettime(int ufd,
 498                                    struct compat_itimerspec __user *otmr);
 499
 500 asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages,
 501                                       __u32 __user *pages,
 502                                       const int __user *nodes,
 503                                       int __user *status,
 504                                       int flags);
 505 asmlinkage long compat_sys_futimesat(unsigned int dfd,
 506                                      const char __user *filename,
 507                                      struct compat_timeval __user *t);
 508 asmlinkage long compat_sys_utimes(const char __user *filename,
 509                                   struct compat_timeval __user *t);
 510 asmlinkage long compat_sys_newstat(const char __user *filename,
 511                                    struct compat_stat __user *statbuf);
 512 asmlinkage long compat_sys_newlstat(const char __user *filename,
 513                                     struct compat_stat __user *statbuf);
 514 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
 515                                       const char __user *filename,
 516                                       struct compat_stat __user *statbuf,
 517                                       int flag);
 518 asmlinkage long compat_sys_newfstat(unsigned int fd,
 519                                     struct compat_stat __user *statbuf);
 520 asmlinkage long compat_sys_statfs(const char __user *pathname,
 521                                   struct compat_statfs __user *buf);
 522 asmlinkage long compat_sys_fstatfs(unsigned int fd,
 523                                    struct compat_statfs __user *buf);
 524 asmlinkage long compat_sys_statfs64(const char __user *pathname,
 525                                     compat_size_t sz,
 526                                     struct compat_statfs64 __user *buf);
 527 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 528                                      struct compat_statfs64 __user *buf);
 529 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
 530                                    compat_ulong_t arg);
 531 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
 532                                  compat_ulong_t arg);
 533 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
 534 asmlinkage long compat_sys_io_getevents(compat_aio_context_t ctx_id,
 535                                         compat_long_t min_nr,
 536                                         compat_long_t nr,
 537                                         struct io_event __user *events,
 538                                         struct compat_timespec __user *timeout);
 539 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
 540                                      u32 __user *iocb);
 541 asmlinkage long compat_sys_mount(const char __user *dev_name,
 542                                  const char __user *dir_name,
 543                                  const char __user *type, compat_ulong_t flags,
 544                                  const void __user *data);
 545 asmlinkage long compat_sys_old_readdir(unsigned int fd,
 546                                        struct compat_old_linux_dirent __user *,
 547                                        unsigned int count);
 548 asmlinkage long compat_sys_getdents(unsigned int fd,
 549                                     struct compat_linux_dirent __user *dirent,
 550                                     unsigned int count);
 551 asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *,
 552                                     unsigned int nr_segs, unsigned int flags);
 553 asmlinkage long compat_sys_open(const char __user *filename, int flags,
 554                                 umode_t mode);
 555 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
 556                                   int flags, umode_t mode);
 557 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 558                                              struct file_handle __user *handle,
 559                                              int flags);
 560 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
 561 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
 562 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
 563                                     compat_ulong_t __user *outp,
 564                                     compat_ulong_t __user *exp,
 565                                     struct compat_timespec __user *tsp,
 566                                     void __user *sig);
 567 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
 568                                  unsigned int nfds,
 569                                  struct compat_timespec __user *tsp,
 570                                  const compat_sigset_t __user *sigmask,
 571                                  compat_size_t sigsetsize);
 572 asmlinkage long compat_sys_signalfd4(int ufd,
 573                                      const compat_sigset_t __user *sigmask,
 574                                      compat_size_t sigsetsize, int flags);
 575 asmlinkage long compat_sys_get_mempolicy(int __user *policy,
 576                                          compat_ulong_t __user *nmask,
 577                                          compat_ulong_t maxnode,
 578                                          compat_ulong_t addr,
 579                                          compat_ulong_t flags);
 580 asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask,
 581                                          compat_ulong_t maxnode);
 582 asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
 583                                  compat_ulong_t mode,
 584                                  compat_ulong_t __user *nmask,
 585                                  compat_ulong_t maxnode, compat_ulong_t flags);
 586
 587 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 588                                       char __user *optval, unsigned int optlen);
 589 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
 590                                    unsigned flags);
 591 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 592                                     unsigned vlen, unsigned int flags);
 593 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
 594                                    unsigned int flags);
 595 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
 596                                 unsigned flags);
 597 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
 598                             unsigned flags, struct sockaddr __user *addr,
 599                             int __user *addrlen);
 600 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 601                                     unsigned vlen, unsigned int flags,
 602                                     struct compat_timespec __user *timeout);
 603 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
 604                                      struct compat_timespec __user *rmtp);
 605 asmlinkage long compat_sys_getitimer(int which,
 606                                      struct compat_itimerval __user *it);
 607 asmlinkage long compat_sys_setitimer(int which,
 608                                      struct compat_itimerval __user *in,
 609                                      struct compat_itimerval __user *out);
 610 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
 611 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 612                                      struct compat_rlimit __user *rlim);
 613 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 614                                      struct compat_rlimit __user *rlim);
 615 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
 616 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 617                                      unsigned int len,
 618                                      compat_ulong_t __user *user_mask_ptr);
 619 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
 620                                      unsigned int len,
 621                                      compat_ulong_t __user *user_mask_ptr);
 622 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
 623                         struct compat_sigevent __user *timer_event_spec,
 624                         timer_t __user *created_timer_id);
 625 asmlinkage long compat_sys_timer_settime(timer_t timer_id, int flags,
 626                                          struct compat_itimerspec __user *new,
 627                                          struct compat_itimerspec __user *old);
 628 asmlinkage long compat_sys_timer_gettime(timer_t timer_id,
 629                                  struct compat_itimerspec __user *setting);
 630 asmlinkage long compat_sys_clock_settime(clockid_t which_clock,
 631                                          struct compat_timespec __user *tp);
 632 asmlinkage long compat_sys_clock_gettime(clockid_t which_clock,
 633                                          struct compat_timespec __user *tp);
 634 asmlinkage long compat_sys_clock_adjtime(clockid_t which_clock,
 635                                          struct compat_timex __user *tp);
 636 asmlinkage long compat_sys_clock_getres(clockid_t which_clock,
 637                                         struct compat_timespec __user *tp);
 638 asmlinkage long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 639                                            struct compat_timespec __user *rqtp,
 640                                            struct compat_timespec __user *rmtp);
 641 asmlinkage long compat_sys_rt_sigtimedwait(compat_sigset_t __user *uthese,
 642                 struct compat_siginfo __user *uinfo,
 643                 struct compat_timespec __user *uts, compat_size_t sigsetsize);
 644 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
 645                                          compat_size_t sigsetsize);
 646 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
 647                                           compat_sigset_t __user *oset,
 648                                           compat_size_t sigsetsize);
 649 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
 650                                          compat_size_t sigsetsize);
 651 #ifndef CONFIG_ODD_RT_SIGACTION
 652 asmlinkage long compat_sys_rt_sigaction(int,
 653                                  const struct compat_sigaction __user *,
 654                                  struct compat_sigaction __user *,
 655                                  compat_size_t);
 656 #endif
 657 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
 658                                 struct compat_siginfo __user *uinfo);
 659 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
 660 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 661                                  compat_ulong_t arg);
 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 compat_sys_getsockopt(int fd, int level, int optname,
 666                                       char __user *optval, int __user *optlen);
 667 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
 668                                       compat_ulong_t nr_segments,
 669                                       struct compat_kexec_segment __user *,
 670                                       compat_ulong_t flags);
 671 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
 672                         const struct compat_mq_attr __user *u_mqstat,
 673                         struct compat_mq_attr __user *u_omqstat);
 674 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
 675                         const struct compat_sigevent __user *u_notification);
 676 asmlinkage long compat_sys_mq_open(const char __user *u_name,
 677                         int oflag, compat_mode_t mode,
 678                         struct compat_mq_attr __user *u_attr);
 679 asmlinkage long compat_sys_mq_timedsend(mqd_t mqdes,
 680                         const char __user *u_msg_ptr,
 681                         compat_size_t msg_len, unsigned int msg_prio,
 682                         const struct compat_timespec __user *u_abs_timeout);
 683 asmlinkage ssize_t compat_sys_mq_timedreceive(mqd_t mqdes,
 684                         char __user *u_msg_ptr,
 685                         compat_size_t msg_len, unsigned int __user *u_msg_prio,
 686                         const struct compat_timespec __user *u_abs_timeout);
 687 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
 688 asmlinkage long compat_sys_sysctl(struct compat_sysctl_args __user *args);
 689
 690 extern ssize_t compat_rw_copy_check_uvector(int type,
 691                 const struct compat_iovec __user *uvector,
 692                 unsigned long nr_segs,
 693                 unsigned long fast_segs, struct iovec *fast_pointer,
 694                 struct iovec **ret_pointer);
 695
 696 extern void __user *compat_alloc_user_space(unsigned long len);
 697
 698 asmlinkage ssize_t compat_sys_process_vm_readv(compat_pid_t pid,
 699                 const struct compat_iovec __user *lvec,
 700                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 701                 compat_ulong_t riovcnt, compat_ulong_t flags);
 702 asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
 703                 const struct compat_iovec __user *lvec,
 704                 compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
 705                 compat_ulong_t riovcnt, compat_ulong_t flags);
 706
 707 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
 708                                     compat_off_t __user *offset, compat_size_t count);
 709 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
 710                                     compat_loff_t __user *offset, compat_size_t count);
 711 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 712                                        compat_stack_t __user *uoss_ptr);
 713
 714 #ifdef __ARCH_WANT_SYS_SIGPENDING
 715 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
 716 #endif
 717
 718 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 719 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
 720                                        compat_old_sigset_t __user *oset);
 721 #endif
 722
 723 int compat_restore_altstack(const compat_stack_t __user *uss);
 724 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
 725 #define compat_save_altstack_ex(uss, sp) do { \
 726         compat_stack_t __user *__uss = uss; \
 727         struct task_struct *t = current; \
 728         put_user_ex(ptr_to_compat((void __user *)t->sas_ss_sp), &__uss->ss_sp); \
 729         put_user_ex(t->sas_ss_flags, &__uss->ss_flags); \
 730         put_user_ex(t->sas_ss_size, &__uss->ss_size); \
 731         if (t->sas_ss_flags & SS_AUTODISARM) \
 732                 sas_ss_reset(t); \
 733 } while (0);
 734
 735 asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid,
 736                                                  struct compat_timespec __user *interval);
 737
 738 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
 739                                             int, const char __user *);
 740
 741 asmlinkage long compat_sys_arch_prctl(int option, unsigned long arg2);
 742
 743 /*
 744  * For most but not all architectures, "am I in a compat syscall?" and
 745  * "am I a compat task?" are the same question.  For architectures on which
 746  * they aren't the same question, arch code can override in_compat_syscall.
 747  */
 748
 749 #ifndef in_compat_syscall
 750 static inline bool in_compat_syscall(void) { return is_compat_task(); }
 751 #endif
 752
 753 /**
 754  * ns_to_compat_timeval - Compat version of ns_to_timeval
 755  * @nsec:       the nanoseconds value to be converted
 756  *
 757  * Returns the compat_timeval representation of the nsec parameter.
 758  */
 759 static inline struct compat_timeval ns_to_compat_timeval(s64 nsec)
 760 {
 761         struct timeval tv;
 762         struct compat_timeval ctv;
 763
 764         tv = ns_to_timeval(nsec);
 765         ctv.tv_sec = tv.tv_sec;
 766         ctv.tv_usec = tv.tv_usec;
 767
 768         return ctv;
 769 }
 770
 771 #else /* !CONFIG_COMPAT */
 772
 773 #define is_compat_task() (0)
 774 static inline bool in_compat_syscall(void) { return false; }
 775
 776 #endif /* CONFIG_COMPAT */
 777
 778 #endif /* _LINUX_COMPAT_H */