Merge tag 'devicetree-fixes-for-5.11-1' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-microblaze.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 #include <linux/time.h>
11
12 #include <linux/stat.h>
13 #include <linux/param.h>        /* for HZ */
14 #include <linux/sem.h>
15 #include <linux/socket.h>
16 #include <linux/if.h>
17 #include <linux/fs.h>
18 #include <linux/aio_abi.h>      /* for aio_context_t */
19 #include <linux/uaccess.h>
20 #include <linux/unistd.h>
21
22 #include <asm/compat.h>
23
24 #ifdef CONFIG_COMPAT
25 #include <asm/siginfo.h>
26 #include <asm/signal.h>
27 #endif
28
29 #ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
30 /*
31  * It may be useful for an architecture to override the definitions of the
32  * COMPAT_SYSCALL_DEFINE0 and COMPAT_SYSCALL_DEFINEx() macros, in particular
33  * to use a different calling convention for syscalls. To allow for that,
34  + the prototypes for the compat_sys_*() functions below will *not* be included
35  * if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
36  */
37 #include <asm/syscall_wrapper.h>
38 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
39
40 #ifndef COMPAT_USE_64BIT_TIME
41 #define COMPAT_USE_64BIT_TIME 0
42 #endif
43
44 #ifndef __SC_DELOUSE
45 #define __SC_DELOUSE(t,v) ((__force t)(unsigned long)(v))
46 #endif
47
48 #ifndef COMPAT_SYSCALL_DEFINE0
49 #define COMPAT_SYSCALL_DEFINE0(name) \
50         asmlinkage long compat_sys_##name(void); \
51         ALLOW_ERROR_INJECTION(compat_sys_##name, ERRNO); \
52         asmlinkage long compat_sys_##name(void)
53 #endif /* COMPAT_SYSCALL_DEFINE0 */
54
55 #define COMPAT_SYSCALL_DEFINE1(name, ...) \
56         COMPAT_SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
57 #define COMPAT_SYSCALL_DEFINE2(name, ...) \
58         COMPAT_SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)
59 #define COMPAT_SYSCALL_DEFINE3(name, ...) \
60         COMPAT_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
61 #define COMPAT_SYSCALL_DEFINE4(name, ...) \
62         COMPAT_SYSCALL_DEFINEx(4, _##name, __VA_ARGS__)
63 #define COMPAT_SYSCALL_DEFINE5(name, ...) \
64         COMPAT_SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)
65 #define COMPAT_SYSCALL_DEFINE6(name, ...) \
66         COMPAT_SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
67
68 /*
69  * The asmlinkage stub is aliased to a function named __se_compat_sys_*() which
70  * sign-extends 32-bit ints to longs whenever needed. The actual work is
71  * done within __do_compat_sys_*().
72  */
73 #ifndef COMPAT_SYSCALL_DEFINEx
74 #define COMPAT_SYSCALL_DEFINEx(x, name, ...)                                    \
75         __diag_push();                                                          \
76         __diag_ignore(GCC, 8, "-Wattribute-alias",                              \
77                       "Type aliasing is used to sanitize syscall arguments");\
78         asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));       \
79         asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))        \
80                 __attribute__((alias(__stringify(__se_compat_sys##name))));     \
81         ALLOW_ERROR_INJECTION(compat_sys##name, ERRNO);                         \
82         static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
83         asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__));  \
84         asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))   \
85         {                                                                       \
86                 long ret = __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__));\
87                 __MAP(x,__SC_TEST,__VA_ARGS__);                                 \
88                 return ret;                                                     \
89         }                                                                       \
90         __diag_pop();                                                           \
91         static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
92 #endif /* COMPAT_SYSCALL_DEFINEx */
93
94 struct compat_iovec {
95         compat_uptr_t   iov_base;
96         compat_size_t   iov_len;
97 };
98
99 #ifdef CONFIG_COMPAT
100
101 #ifndef compat_user_stack_pointer
102 #define compat_user_stack_pointer() current_user_stack_pointer()
103 #endif
104 #ifndef compat_sigaltstack      /* we'll need that for MIPS */
105 typedef struct compat_sigaltstack {
106         compat_uptr_t                   ss_sp;
107         int                             ss_flags;
108         compat_size_t                   ss_size;
109 } compat_stack_t;
110 #endif
111 #ifndef COMPAT_MINSIGSTKSZ
112 #define COMPAT_MINSIGSTKSZ      MINSIGSTKSZ
113 #endif
114
115 #define compat_jiffies_to_clock_t(x)    \
116                 (((unsigned long)(x) * COMPAT_USER_HZ) / HZ)
117
118 typedef __compat_uid32_t        compat_uid_t;
119 typedef __compat_gid32_t        compat_gid_t;
120
121 struct compat_sel_arg_struct;
122 struct rusage;
123
124 struct old_itimerval32;
125
126 struct compat_tms {
127         compat_clock_t          tms_utime;
128         compat_clock_t          tms_stime;
129         compat_clock_t          tms_cutime;
130         compat_clock_t          tms_cstime;
131 };
132
133 #define _COMPAT_NSIG_WORDS      (_COMPAT_NSIG / _COMPAT_NSIG_BPW)
134
135 typedef struct {
136         compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
137 } compat_sigset_t;
138
139 int set_compat_user_sigmask(const compat_sigset_t __user *umask,
140                             size_t sigsetsize);
141
142 struct compat_sigaction {
143 #ifndef __ARCH_HAS_IRIX_SIGACTION
144         compat_uptr_t                   sa_handler;
145         compat_ulong_t                  sa_flags;
146 #else
147         compat_uint_t                   sa_flags;
148         compat_uptr_t                   sa_handler;
149 #endif
150 #ifdef __ARCH_HAS_SA_RESTORER
151         compat_uptr_t                   sa_restorer;
152 #endif
153         compat_sigset_t                 sa_mask __packed;
154 };
155
156 typedef union compat_sigval {
157         compat_int_t    sival_int;
158         compat_uptr_t   sival_ptr;
159 } compat_sigval_t;
160
161 typedef struct compat_siginfo {
162         int si_signo;
163 #ifndef __ARCH_HAS_SWAPPED_SIGINFO
164         int si_errno;
165         int si_code;
166 #else
167         int si_code;
168         int si_errno;
169 #endif
170
171         union {
172                 int _pad[128/sizeof(int) - 3];
173
174                 /* kill() */
175                 struct {
176                         compat_pid_t _pid;      /* sender's pid */
177                         __compat_uid32_t _uid;  /* sender's uid */
178                 } _kill;
179
180                 /* POSIX.1b timers */
181                 struct {
182                         compat_timer_t _tid;    /* timer id */
183                         int _overrun;           /* overrun count */
184                         compat_sigval_t _sigval;        /* same as below */
185                 } _timer;
186
187                 /* POSIX.1b signals */
188                 struct {
189                         compat_pid_t _pid;      /* sender's pid */
190                         __compat_uid32_t _uid;  /* sender's uid */
191                         compat_sigval_t _sigval;
192                 } _rt;
193
194                 /* SIGCHLD */
195                 struct {
196                         compat_pid_t _pid;      /* which child */
197                         __compat_uid32_t _uid;  /* sender's uid */
198                         int _status;            /* exit code */
199                         compat_clock_t _utime;
200                         compat_clock_t _stime;
201                 } _sigchld;
202
203 #ifdef CONFIG_X86_X32_ABI
204                 /* SIGCHLD (x32 version) */
205                 struct {
206                         compat_pid_t _pid;      /* which child */
207                         __compat_uid32_t _uid;  /* sender's uid */
208                         int _status;            /* exit code */
209                         compat_s64 _utime;
210                         compat_s64 _stime;
211                 } _sigchld_x32;
212 #endif
213
214                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
215                 struct {
216                         compat_uptr_t _addr;    /* faulting insn/memory ref. */
217 #ifdef __ARCH_SI_TRAPNO
218                         int _trapno;    /* TRAP # which caused the signal */
219 #endif
220 #define __COMPAT_ADDR_BND_PKEY_PAD  (__alignof__(compat_uptr_t) < sizeof(short) ? \
221                                      sizeof(short) : __alignof__(compat_uptr_t))
222                         union {
223                                 /*
224                                  * used when si_code=BUS_MCEERR_AR or
225                                  * used when si_code=BUS_MCEERR_AO
226                                  */
227                                 short int _addr_lsb;    /* Valid LSB of the reported address. */
228                                 /* used when si_code=SEGV_BNDERR */
229                                 struct {
230                                         char _dummy_bnd[__COMPAT_ADDR_BND_PKEY_PAD];
231                                         compat_uptr_t _lower;
232                                         compat_uptr_t _upper;
233                                 } _addr_bnd;
234                                 /* used when si_code=SEGV_PKUERR */
235                                 struct {
236                                         char _dummy_pkey[__COMPAT_ADDR_BND_PKEY_PAD];
237                                         u32 _pkey;
238                                 } _addr_pkey;
239                         };
240                 } _sigfault;
241
242                 /* SIGPOLL */
243                 struct {
244                         compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
245                         int _fd;
246                 } _sigpoll;
247
248                 struct {
249                         compat_uptr_t _call_addr; /* calling user insn */
250                         int _syscall;   /* triggering system call number */
251                         unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
252                 } _sigsys;
253         } _sifields;
254 } compat_siginfo_t;
255
256 struct compat_rlimit {
257         compat_ulong_t  rlim_cur;
258         compat_ulong_t  rlim_max;
259 };
260
261 struct compat_rusage {
262         struct old_timeval32 ru_utime;
263         struct old_timeval32 ru_stime;
264         compat_long_t   ru_maxrss;
265         compat_long_t   ru_ixrss;
266         compat_long_t   ru_idrss;
267         compat_long_t   ru_isrss;
268         compat_long_t   ru_minflt;
269         compat_long_t   ru_majflt;
270         compat_long_t   ru_nswap;
271         compat_long_t   ru_inblock;
272         compat_long_t   ru_oublock;
273         compat_long_t   ru_msgsnd;
274         compat_long_t   ru_msgrcv;
275         compat_long_t   ru_nsignals;
276         compat_long_t   ru_nvcsw;
277         compat_long_t   ru_nivcsw;
278 };
279
280 extern int put_compat_rusage(const struct rusage *,
281                              struct compat_rusage __user *);
282
283 struct compat_siginfo;
284 struct __compat_aio_sigset;
285
286 struct compat_dirent {
287         u32             d_ino;
288         compat_off_t    d_off;
289         u16             d_reclen;
290         char            d_name[256];
291 };
292
293 struct compat_ustat {
294         compat_daddr_t          f_tfree;
295         compat_ino_t            f_tinode;
296         char                    f_fname[6];
297         char                    f_fpack[6];
298 };
299
300 #define COMPAT_SIGEV_PAD_SIZE   ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
301
302 typedef struct compat_sigevent {
303         compat_sigval_t sigev_value;
304         compat_int_t sigev_signo;
305         compat_int_t sigev_notify;
306         union {
307                 compat_int_t _pad[COMPAT_SIGEV_PAD_SIZE];
308                 compat_int_t _tid;
309
310                 struct {
311                         compat_uptr_t _function;
312                         compat_uptr_t _attribute;
313                 } _sigev_thread;
314         } _sigev_un;
315 } compat_sigevent_t;
316
317 struct compat_ifmap {
318         compat_ulong_t mem_start;
319         compat_ulong_t mem_end;
320         unsigned short base_addr;
321         unsigned char irq;
322         unsigned char dma;
323         unsigned char port;
324 };
325
326 struct compat_if_settings {
327         unsigned int type;      /* Type of physical device or protocol */
328         unsigned int size;      /* Size of the data allocated by the caller */
329         compat_uptr_t ifs_ifsu; /* union of pointers */
330 };
331
332 struct compat_ifreq {
333         union {
334                 char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "en0" */
335         } ifr_ifrn;
336         union {
337                 struct  sockaddr ifru_addr;
338                 struct  sockaddr ifru_dstaddr;
339                 struct  sockaddr ifru_broadaddr;
340                 struct  sockaddr ifru_netmask;
341                 struct  sockaddr ifru_hwaddr;
342                 short   ifru_flags;
343                 compat_int_t    ifru_ivalue;
344                 compat_int_t    ifru_mtu;
345                 struct  compat_ifmap ifru_map;
346                 char    ifru_slave[IFNAMSIZ];   /* Just fits the size */
347                 char    ifru_newname[IFNAMSIZ];
348                 compat_caddr_t  ifru_data;
349                 struct  compat_if_settings ifru_settings;
350         } ifr_ifru;
351 };
352
353 struct compat_ifconf {
354         compat_int_t    ifc_len;                /* size of buffer */
355         compat_caddr_t  ifcbuf;
356 };
357
358 struct compat_robust_list {
359         compat_uptr_t                   next;
360 };
361
362 struct compat_robust_list_head {
363         struct compat_robust_list       list;
364         compat_long_t                   futex_offset;
365         compat_uptr_t                   list_op_pending;
366 };
367
368 #ifdef CONFIG_COMPAT_OLD_SIGACTION
369 struct compat_old_sigaction {
370         compat_uptr_t                   sa_handler;
371         compat_old_sigset_t             sa_mask;
372         compat_ulong_t                  sa_flags;
373         compat_uptr_t                   sa_restorer;
374 };
375 #endif
376
377 struct compat_keyctl_kdf_params {
378         compat_uptr_t hashname;
379         compat_uptr_t otherinfo;
380         __u32 otherinfolen;
381         __u32 __spare[8];
382 };
383
384 struct compat_statfs;
385 struct compat_statfs64;
386 struct compat_old_linux_dirent;
387 struct compat_linux_dirent;
388 struct linux_dirent64;
389 struct compat_msghdr;
390 struct compat_mmsghdr;
391 struct compat_sysinfo;
392 struct compat_sysctl_args;
393 struct compat_kexec_segment;
394 struct compat_mq_attr;
395 struct compat_msgbuf;
396
397 #define BITS_PER_COMPAT_LONG    (8*sizeof(compat_long_t))
398
399 #define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG)
400
401 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
402                        unsigned long bitmap_size);
403 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
404                        unsigned long bitmap_size);
405 void copy_siginfo_to_external32(struct compat_siginfo *to,
406                 const struct kernel_siginfo *from);
407 int copy_siginfo_from_user32(kernel_siginfo_t *to,
408                 const struct compat_siginfo __user *from);
409 int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
410                 const kernel_siginfo_t *from);
411 #ifndef copy_siginfo_to_user32
412 #define copy_siginfo_to_user32 __copy_siginfo_to_user32
413 #endif
414 int get_compat_sigevent(struct sigevent *event,
415                 const struct compat_sigevent __user *u_event);
416
417 extern int get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat);
418
419 /*
420  * Defined inline such that size can be compile time constant, which avoids
421  * CONFIG_HARDENED_USERCOPY complaining about copies from task_struct
422  */
423 static inline int
424 put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
425                   unsigned int size)
426 {
427         /* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
428 #ifdef __BIG_ENDIAN
429         compat_sigset_t v;
430         switch (_NSIG_WORDS) {
431         case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
432                 fallthrough;
433         case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
434                 fallthrough;
435         case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
436                 fallthrough;
437         case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
438         }
439         return copy_to_user(compat, &v, size) ? -EFAULT : 0;
440 #else
441         return copy_to_user(compat, set, size) ? -EFAULT : 0;
442 #endif
443 }
444
445 #ifdef CONFIG_CPU_BIG_ENDIAN
446 #define unsafe_put_compat_sigset(compat, set, label) do {               \
447         compat_sigset_t __user *__c = compat;                           \
448         const sigset_t *__s = set;                                      \
449                                                                         \
450         switch (_NSIG_WORDS) {                                          \
451         case 4:                                                         \
452                 unsafe_put_user(__s->sig[3] >> 32, &__c->sig[7], label);        \
453                 unsafe_put_user(__s->sig[3], &__c->sig[6], label);      \
454                 fallthrough;                                            \
455         case 3:                                                         \
456                 unsafe_put_user(__s->sig[2] >> 32, &__c->sig[5], label);        \
457                 unsafe_put_user(__s->sig[2], &__c->sig[4], label);      \
458                 fallthrough;                                            \
459         case 2:                                                         \
460                 unsafe_put_user(__s->sig[1] >> 32, &__c->sig[3], label);        \
461                 unsafe_put_user(__s->sig[1], &__c->sig[2], label);      \
462                 fallthrough;                                            \
463         case 1:                                                         \
464                 unsafe_put_user(__s->sig[0] >> 32, &__c->sig[1], label);        \
465                 unsafe_put_user(__s->sig[0], &__c->sig[0], label);      \
466         }                                                               \
467 } while (0)
468 #else
469 #define unsafe_put_compat_sigset(compat, set, label) do {               \
470         compat_sigset_t __user *__c = compat;                           \
471         const sigset_t *__s = set;                                      \
472                                                                         \
473         unsafe_copy_to_user(__c, __s, sizeof(*__c), label);             \
474 } while (0)
475 #endif
476
477 extern int compat_ptrace_request(struct task_struct *child,
478                                  compat_long_t request,
479                                  compat_ulong_t addr, compat_ulong_t data);
480
481 extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
482                                compat_ulong_t addr, compat_ulong_t data);
483
484 struct epoll_event;     /* fortunately, this one is fixed-layout */
485
486 extern void __user *compat_alloc_user_space(unsigned long len);
487
488 int compat_restore_altstack(const compat_stack_t __user *uss);
489 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
490 #define unsafe_compat_save_altstack(uss, sp, label) do { \
491         compat_stack_t __user *__uss = uss; \
492         struct task_struct *t = current; \
493         unsafe_put_user(ptr_to_compat((void __user *)t->sas_ss_sp), \
494                         &__uss->ss_sp, label); \
495         unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \
496         unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \
497         if (t->sas_ss_flags & SS_AUTODISARM) \
498                 sas_ss_reset(t); \
499 } while (0);
500
501 /*
502  * These syscall function prototypes are kept in the same order as
503  * include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
504  * go below.
505  *
506  * Please note that these prototypes here are only provided for information
507  * purposes, for static analysis, and for linking from the syscall table.
508  * These functions should not be called elsewhere from kernel code.
509  *
510  * As the syscall calling convention may be different from the default
511  * for architectures overriding the syscall calling convention, do not
512  * include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
513  */
514 #ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
515 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
516 asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
517                                      u32 __user *iocb);
518 asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
519                                         compat_long_t min_nr,
520                                         compat_long_t nr,
521                                         struct io_event __user *events,
522                                         struct old_timespec32 __user *timeout,
523                                         const struct __compat_aio_sigset __user *usig);
524 asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id,
525                                         compat_long_t min_nr,
526                                         compat_long_t nr,
527                                         struct io_event __user *events,
528                                         struct __kernel_timespec __user *timeout,
529                                         const struct __compat_aio_sigset __user *usig);
530
531 /* fs/cookies.c */
532 asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);
533
534 /* fs/eventpoll.c */
535 asmlinkage long compat_sys_epoll_pwait(int epfd,
536                         struct epoll_event __user *events,
537                         int maxevents, int timeout,
538                         const compat_sigset_t __user *sigmask,
539                         compat_size_t sigsetsize);
540 asmlinkage long compat_sys_epoll_pwait2(int epfd,
541                         struct epoll_event __user *events,
542                         int maxevents,
543                         const struct __kernel_timespec __user *timeout,
544                         const compat_sigset_t __user *sigmask,
545                         compat_size_t sigsetsize);
546
547 /* fs/fcntl.c */
548 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
549                                  compat_ulong_t arg);
550 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
551                                    compat_ulong_t arg);
552
553 /* fs/ioctl.c */
554 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
555                                  compat_ulong_t arg);
556
557 /* fs/open.c */
558 asmlinkage long compat_sys_statfs(const char __user *pathname,
559                                   struct compat_statfs __user *buf);
560 asmlinkage long compat_sys_statfs64(const char __user *pathname,
561                                     compat_size_t sz,
562                                     struct compat_statfs64 __user *buf);
563 asmlinkage long compat_sys_fstatfs(unsigned int fd,
564                                    struct compat_statfs __user *buf);
565 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
566                                      struct compat_statfs64 __user *buf);
567 asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
568 asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
569 /* No generic prototype for truncate64, ftruncate64, fallocate */
570 asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
571                                   int flags, umode_t mode);
572
573 /* fs/readdir.c */
574 asmlinkage long compat_sys_getdents(unsigned int fd,
575                                     struct compat_linux_dirent __user *dirent,
576                                     unsigned int count);
577
578 /* fs/read_write.c */
579 asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
580 /* No generic prototype for pread64 and pwrite64 */
581 asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
582                 const struct iovec __user *vec,
583                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
584 asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
585                 const struct iovec __user *vec,
586                 compat_ulong_t vlen, u32 pos_low, u32 pos_high);
587 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
588 asmlinkage long compat_sys_preadv64(unsigned long fd,
589                 const struct iovec __user *vec,
590                 unsigned long vlen, loff_t pos);
591 #endif
592
593 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
594 asmlinkage long compat_sys_pwritev64(unsigned long fd,
595                 const struct iovec __user *vec,
596                 unsigned long vlen, loff_t pos);
597 #endif
598
599 /* fs/sendfile.c */
600 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
601                                     compat_off_t __user *offset, compat_size_t count);
602 asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
603                                     compat_loff_t __user *offset, compat_size_t count);
604
605 /* fs/select.c */
606 asmlinkage long compat_sys_pselect6_time32(int n, compat_ulong_t __user *inp,
607                                     compat_ulong_t __user *outp,
608                                     compat_ulong_t __user *exp,
609                                     struct old_timespec32 __user *tsp,
610                                     void __user *sig);
611 asmlinkage long compat_sys_pselect6_time64(int n, compat_ulong_t __user *inp,
612                                     compat_ulong_t __user *outp,
613                                     compat_ulong_t __user *exp,
614                                     struct __kernel_timespec __user *tsp,
615                                     void __user *sig);
616 asmlinkage long compat_sys_ppoll_time32(struct pollfd __user *ufds,
617                                  unsigned int nfds,
618                                  struct old_timespec32 __user *tsp,
619                                  const compat_sigset_t __user *sigmask,
620                                  compat_size_t sigsetsize);
621 asmlinkage long compat_sys_ppoll_time64(struct pollfd __user *ufds,
622                                  unsigned int nfds,
623                                  struct __kernel_timespec __user *tsp,
624                                  const compat_sigset_t __user *sigmask,
625                                  compat_size_t sigsetsize);
626
627 /* fs/signalfd.c */
628 asmlinkage long compat_sys_signalfd4(int ufd,
629                                      const compat_sigset_t __user *sigmask,
630                                      compat_size_t sigsetsize, int flags);
631
632 /* fs/stat.c */
633 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
634                                       const char __user *filename,
635                                       struct compat_stat __user *statbuf,
636                                       int flag);
637 asmlinkage long compat_sys_newfstat(unsigned int fd,
638                                     struct compat_stat __user *statbuf);
639
640 /* fs/sync.c: No generic prototype for sync_file_range and sync_file_range2 */
641
642 /* kernel/exit.c */
643 asmlinkage long compat_sys_waitid(int, compat_pid_t,
644                 struct compat_siginfo __user *, int,
645                 struct compat_rusage __user *);
646
647
648
649 /* kernel/futex.c */
650 asmlinkage long
651 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
652                            compat_size_t len);
653 asmlinkage long
654 compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
655                            compat_size_t __user *len_ptr);
656
657 /* kernel/itimer.c */
658 asmlinkage long compat_sys_getitimer(int which,
659                                      struct old_itimerval32 __user *it);
660 asmlinkage long compat_sys_setitimer(int which,
661                                      struct old_itimerval32 __user *in,
662                                      struct old_itimerval32 __user *out);
663
664 /* kernel/kexec.c */
665 asmlinkage long compat_sys_kexec_load(compat_ulong_t entry,
666                                       compat_ulong_t nr_segments,
667                                       struct compat_kexec_segment __user *,
668                                       compat_ulong_t flags);
669
670 /* kernel/posix-timers.c */
671 asmlinkage long compat_sys_timer_create(clockid_t which_clock,
672                         struct compat_sigevent __user *timer_event_spec,
673                         timer_t __user *created_timer_id);
674
675 /* kernel/ptrace.c */
676 asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
677                                   compat_long_t addr, compat_long_t data);
678
679 /* kernel/sched/core.c */
680 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
681                                      unsigned int len,
682                                      compat_ulong_t __user *user_mask_ptr);
683 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid,
684                                      unsigned int len,
685                                      compat_ulong_t __user *user_mask_ptr);
686
687 /* kernel/signal.c */
688 asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
689                                        compat_stack_t __user *uoss_ptr);
690 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset,
691                                          compat_size_t sigsetsize);
692 #ifndef CONFIG_ODD_RT_SIGACTION
693 asmlinkage long compat_sys_rt_sigaction(int,
694                                  const struct compat_sigaction __user *,
695                                  struct compat_sigaction __user *,
696                                  compat_size_t);
697 #endif
698 asmlinkage long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
699                                           compat_sigset_t __user *oset,
700                                           compat_size_t sigsetsize);
701 asmlinkage long compat_sys_rt_sigpending(compat_sigset_t __user *uset,
702                                          compat_size_t sigsetsize);
703 asmlinkage long compat_sys_rt_sigtimedwait_time32(compat_sigset_t __user *uthese,
704                 struct compat_siginfo __user *uinfo,
705                 struct old_timespec32 __user *uts, compat_size_t sigsetsize);
706 asmlinkage long compat_sys_rt_sigtimedwait_time64(compat_sigset_t __user *uthese,
707                 struct compat_siginfo __user *uinfo,
708                 struct __kernel_timespec __user *uts, compat_size_t sigsetsize);
709 asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
710                                 struct compat_siginfo __user *uinfo);
711 /* No generic prototype for rt_sigreturn */
712
713 /* kernel/sys.c */
714 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf);
715 asmlinkage long compat_sys_getrlimit(unsigned int resource,
716                                      struct compat_rlimit __user *rlim);
717 asmlinkage long compat_sys_setrlimit(unsigned int resource,
718                                      struct compat_rlimit __user *rlim);
719 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru);
720
721 /* kernel/time.c */
722 asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
723                 struct timezone __user *tz);
724 asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
725                 struct timezone __user *tz);
726
727 /* kernel/timer.c */
728 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
729
730 /* ipc/mqueue.c */
731 asmlinkage long compat_sys_mq_open(const char __user *u_name,
732                         int oflag, compat_mode_t mode,
733                         struct compat_mq_attr __user *u_attr);
734 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
735                         const struct compat_sigevent __user *u_notification);
736 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
737                         const struct compat_mq_attr __user *u_mqstat,
738                         struct compat_mq_attr __user *u_omqstat);
739
740 /* ipc/msg.c */
741 asmlinkage long compat_sys_msgctl(int first, int second, void __user *uptr);
742 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
743                 compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
744 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
745                 compat_ssize_t msgsz, int msgflg);
746
747 /* ipc/sem.c */
748 asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
749
750 /* ipc/shm.c */
751 asmlinkage long compat_sys_shmctl(int first, int second, void __user *uptr);
752 asmlinkage long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg);
753
754 /* net/socket.c */
755 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len,
756                             unsigned flags, struct sockaddr __user *addr,
757                             int __user *addrlen);
758 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg,
759                                    unsigned flags);
760 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg,
761                                    unsigned int flags);
762
763 /* mm/filemap.c: No generic prototype for readahead */
764
765 /* security/keys/keyctl.c */
766 asmlinkage long compat_sys_keyctl(u32 option,
767                               u32 arg2, u32 arg3, u32 arg4, u32 arg5);
768
769 /* arch/example/kernel/sys_example.c */
770 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
771                      const compat_uptr_t __user *envp);
772
773 /* mm/fadvise.c: No generic prototype for fadvise64_64 */
774
775 /* mm/, CONFIG_MMU only */
776 asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
777                                  compat_ulong_t mode,
778                                  compat_ulong_t __user *nmask,
779                                  compat_ulong_t maxnode, compat_ulong_t flags);
780 asmlinkage long compat_sys_get_mempolicy(int __user *policy,
781                                          compat_ulong_t __user *nmask,
782                                          compat_ulong_t maxnode,
783                                          compat_ulong_t addr,
784                                          compat_ulong_t flags);
785 asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask,
786                                          compat_ulong_t maxnode);
787 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
788                 compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
789                 const compat_ulong_t __user *new_nodes);
790 asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages,
791                                       __u32 __user *pages,
792                                       const int __user *nodes,
793                                       int __user *status,
794                                       int flags);
795
796 asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,
797                                         compat_pid_t pid, int sig,
798                                         struct compat_siginfo __user *uinfo);
799 asmlinkage long compat_sys_recvmmsg_time64(int fd, struct compat_mmsghdr __user *mmsg,
800                                     unsigned vlen, unsigned int flags,
801                                     struct __kernel_timespec __user *timeout);
802 asmlinkage long compat_sys_recvmmsg_time32(int fd, struct compat_mmsghdr __user *mmsg,
803                                     unsigned vlen, unsigned int flags,
804                                     struct old_timespec32 __user *timeout);
805 asmlinkage long compat_sys_wait4(compat_pid_t pid,
806                                  compat_uint_t __user *stat_addr, int options,
807                                  struct compat_rusage __user *ru);
808 asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
809                                             int, const char __user *);
810 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
811                                              struct file_handle __user *handle,
812                                              int flags);
813 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
814                                     unsigned vlen, unsigned int flags);
815 asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
816                      const compat_uptr_t __user *argv,
817                      const compat_uptr_t __user *envp, int flags);
818 asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
819                 const struct iovec __user *vec,
820                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
821 asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
822                 const struct iovec __user *vec,
823                 compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
824 #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
825 asmlinkage long  compat_sys_preadv64v2(unsigned long fd,
826                 const struct iovec __user *vec,
827                 unsigned long vlen, loff_t pos, rwf_t flags);
828 #endif
829
830 #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
831 asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
832                 const struct iovec __user *vec,
833                 unsigned long vlen, loff_t pos, rwf_t flags);
834 #endif
835
836
837 /*
838  * Deprecated system calls which are still defined in
839  * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
840  */
841
842 /* __ARCH_WANT_SYSCALL_NO_AT */
843 asmlinkage long compat_sys_open(const char __user *filename, int flags,
844                                 umode_t mode);
845
846 /* __ARCH_WANT_SYSCALL_NO_FLAGS */
847 asmlinkage long compat_sys_signalfd(int ufd,
848                                     const compat_sigset_t __user *sigmask,
849                                     compat_size_t sigsetsize);
850
851 /* __ARCH_WANT_SYSCALL_OFF_T */
852 asmlinkage long compat_sys_newstat(const char __user *filename,
853                                    struct compat_stat __user *statbuf);
854 asmlinkage long compat_sys_newlstat(const char __user *filename,
855                                     struct compat_stat __user *statbuf);
856
857 /* __ARCH_WANT_SYSCALL_DEPRECATED */
858 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
859                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
860                 struct old_timeval32 __user *tvp);
861 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u32);
862 asmlinkage long compat_sys_recv(int fd, void __user *buf, compat_size_t len,
863                                 unsigned flags);
864
865 /* obsolete: fs/readdir.c */
866 asmlinkage long compat_sys_old_readdir(unsigned int fd,
867                                        struct compat_old_linux_dirent __user *,
868                                        unsigned int count);
869
870 /* obsolete: fs/select.c */
871 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg);
872
873 /* obsolete: ipc */
874 asmlinkage long compat_sys_ipc(u32, int, int, u32, compat_uptr_t, u32);
875
876 /* obsolete: kernel/signal.c */
877 #ifdef __ARCH_WANT_SYS_SIGPENDING
878 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set);
879 #endif
880
881 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
882 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *nset,
883                                        compat_old_sigset_t __user *oset);
884 #endif
885 #ifdef CONFIG_COMPAT_OLD_SIGACTION
886 asmlinkage long compat_sys_sigaction(int sig,
887                                    const struct compat_old_sigaction __user *act,
888                                    struct compat_old_sigaction __user *oact);
889 #endif
890
891 /* obsolete: net/socket.c */
892 asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
893
894 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
895
896
897 /*
898  * For most but not all architectures, "am I in a compat syscall?" and
899  * "am I a compat task?" are the same question.  For architectures on which
900  * they aren't the same question, arch code can override in_compat_syscall.
901  */
902
903 #ifndef in_compat_syscall
904 static inline bool in_compat_syscall(void) { return is_compat_task(); }
905 #endif
906
907 /**
908  * ns_to_old_timeval32 - Compat version of ns_to_timeval
909  * @nsec:       the nanoseconds value to be converted
910  *
911  * Returns the old_timeval32 representation of the nsec parameter.
912  */
913 static inline struct old_timeval32 ns_to_old_timeval32(s64 nsec)
914 {
915         struct __kernel_old_timeval tv;
916         struct old_timeval32 ctv;
917
918         tv = ns_to_kernel_old_timeval(nsec);
919         ctv.tv_sec = tv.tv_sec;
920         ctv.tv_usec = tv.tv_usec;
921
922         return ctv;
923 }
924
925 /*
926  * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz())
927  * directly.  Instead, use one of the functions which work equivalently, such
928  * as the kcompat_sys_xyzyyz() functions prototyped below.
929  */
930
931 int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
932                      struct compat_statfs64 __user * buf);
933 int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
934                           struct compat_statfs64 __user * buf);
935
936 #else /* !CONFIG_COMPAT */
937
938 #define is_compat_task() (0)
939 /* Ensure no one redefines in_compat_syscall() under !CONFIG_COMPAT */
940 #define in_compat_syscall in_compat_syscall
941 static inline bool in_compat_syscall(void) { return false; }
942
943 #endif /* CONFIG_COMPAT */
944
945 /*
946  * Some legacy ABIs like the i386 one use less than natural alignment for 64-bit
947  * types, and will need special compat treatment for that.  Most architectures
948  * don't need that special handling even for compat syscalls.
949  */
950 #ifndef compat_need_64bit_alignment_fixup
951 #define compat_need_64bit_alignment_fixup()             false
952 #endif
953
954 /*
955  * A pointer passed in from user mode. This should not
956  * be used for syscall parameters, just declare them
957  * as pointers because the syscall entry code will have
958  * appropriately converted them already.
959  */
960 #ifndef compat_ptr
961 static inline void __user *compat_ptr(compat_uptr_t uptr)
962 {
963         return (void __user *)(unsigned long)uptr;
964 }
965 #endif
966
967 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
968 {
969         return (u32)(unsigned long)uptr;
970 }
971
972 #endif /* _LINUX_COMPAT_H */