arch/arm64/include/asm/compat.h

   1 /*
   2  * Copyright (C) 2012 ARM Ltd.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16 #ifndef __ASM_COMPAT_H
  17 #define __ASM_COMPAT_H
  18 #ifdef __KERNEL__
  19 #ifdef CONFIG_COMPAT
  20
  21 /*
  22  * Architecture specific compatibility types
  23  */
  24 #include <linux/types.h>
  25 #include <linux/sched.h>
  26
  27 #define COMPAT_USER_HZ          100
  28 #ifdef __AARCH64EB__
  29 #define COMPAT_UTS_MACHINE      "armv8b\0\0"
  30 #else
  31 #define COMPAT_UTS_MACHINE      "armv8l\0\0"
  32 #endif
  33
  34 typedef u32             compat_size_t;
  35 typedef s32             compat_ssize_t;
  36 typedef s32             compat_time_t;
  37 typedef s32             compat_clock_t;
  38 typedef s32             compat_pid_t;
  39 typedef u16             __compat_uid_t;
  40 typedef u16             __compat_gid_t;
  41 typedef u16             __compat_uid16_t;
  42 typedef u16             __compat_gid16_t;
  43 typedef u32             __compat_uid32_t;
  44 typedef u32             __compat_gid32_t;
  45 typedef u16             compat_mode_t;
  46 typedef u32             compat_ino_t;
  47 typedef u32             compat_dev_t;
  48 typedef s32             compat_off_t;
  49 typedef s64             compat_loff_t;
  50 typedef s32             compat_nlink_t;
  51 typedef u16             compat_ipc_pid_t;
  52 typedef s32             compat_daddr_t;
  53 typedef u32             compat_caddr_t;
  54 typedef __kernel_fsid_t compat_fsid_t;
  55 typedef s32             compat_key_t;
  56 typedef s32             compat_timer_t;
  57
  58 typedef s16             compat_short_t;
  59 typedef s32             compat_int_t;
  60 typedef s32             compat_long_t;
  61 typedef s64             compat_s64;
  62 typedef u16             compat_ushort_t;
  63 typedef u32             compat_uint_t;
  64 typedef u32             compat_ulong_t;
  65 typedef u64             compat_u64;
  66 typedef u32             compat_uptr_t;
  67
  68 struct compat_timespec {
  69         compat_time_t   tv_sec;
  70         s32             tv_nsec;
  71 };
  72
  73 struct compat_timeval {
  74         compat_time_t   tv_sec;
  75         s32             tv_usec;
  76 };
  77
  78 struct compat_stat {
  79 #ifdef __AARCH64EB__
  80         short           st_dev;
  81         short           __pad1;
  82 #else
  83         compat_dev_t    st_dev;
  84 #endif
  85         compat_ino_t    st_ino;
  86         compat_mode_t   st_mode;
  87         compat_ushort_t st_nlink;
  88         __compat_uid16_t        st_uid;
  89         __compat_gid16_t        st_gid;
  90 #ifdef __AARCH64EB__
  91         short           st_rdev;
  92         short           __pad2;
  93 #else
  94         compat_dev_t    st_rdev;
  95 #endif
  96         compat_off_t    st_size;
  97         compat_off_t    st_blksize;
  98         compat_off_t    st_blocks;
  99         compat_time_t   st_atime;
 100         compat_ulong_t  st_atime_nsec;
 101         compat_time_t   st_mtime;
 102         compat_ulong_t  st_mtime_nsec;
 103         compat_time_t   st_ctime;
 104         compat_ulong_t  st_ctime_nsec;
 105         compat_ulong_t  __unused4[2];
 106 };
 107
 108 struct compat_flock {
 109         short           l_type;
 110         short           l_whence;
 111         compat_off_t    l_start;
 112         compat_off_t    l_len;
 113         compat_pid_t    l_pid;
 114 };
 115
 116 #define F_GETLK64       12      /*  using 'struct flock64' */
 117 #define F_SETLK64       13
 118 #define F_SETLKW64      14
 119
 120 struct compat_flock64 {
 121         short           l_type;
 122         short           l_whence;
 123         compat_loff_t   l_start;
 124         compat_loff_t   l_len;
 125         compat_pid_t    l_pid;
 126 };
 127
 128 struct compat_statfs {
 129         int             f_type;
 130         int             f_bsize;
 131         int             f_blocks;
 132         int             f_bfree;
 133         int             f_bavail;
 134         int             f_files;
 135         int             f_ffree;
 136         compat_fsid_t   f_fsid;
 137         int             f_namelen;      /* SunOS ignores this field. */
 138         int             f_frsize;
 139         int             f_flags;
 140         int             f_spare[4];
 141 };
 142
 143 #define COMPAT_RLIM_INFINITY            0xffffffff
 144
 145 typedef u32             compat_old_sigset_t;
 146
 147 #define _COMPAT_NSIG            64
 148 #define _COMPAT_NSIG_BPW        32
 149
 150 typedef u32             compat_sigset_word;
 151
 152 typedef union compat_sigval {
 153         compat_int_t    sival_int;
 154         compat_uptr_t   sival_ptr;
 155 } compat_sigval_t;
 156
 157 typedef struct compat_siginfo {
 158         int si_signo;
 159         int si_errno;
 160         int si_code;
 161
 162         union {
 163                 int _pad[128/sizeof(int) - 3];
 164
 165                 /* kill() */
 166                 struct {
 167                         compat_pid_t _pid;      /* sender's pid */
 168                         __compat_uid32_t _uid;  /* sender's uid */
 169                 } _kill;
 170
 171                 /* POSIX.1b timers */
 172                 struct {
 173                         compat_timer_t _tid;    /* timer id */
 174                         int _overrun;           /* overrun count */
 175                         compat_sigval_t _sigval;        /* same as below */
 176                         int _sys_private;       /* not to be passed to user */
 177                 } _timer;
 178
 179                 /* POSIX.1b signals */
 180                 struct {
 181                         compat_pid_t _pid;      /* sender's pid */
 182                         __compat_uid32_t _uid;  /* sender's uid */
 183                         compat_sigval_t _sigval;
 184                 } _rt;
 185
 186                 /* SIGCHLD */
 187                 struct {
 188                         compat_pid_t _pid;      /* which child */
 189                         __compat_uid32_t _uid;  /* sender's uid */
 190                         int _status;            /* exit code */
 191                         compat_clock_t _utime;
 192                         compat_clock_t _stime;
 193                 } _sigchld;
 194
 195                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
 196                 struct {
 197                         compat_uptr_t _addr; /* faulting insn/memory ref. */
 198                         short _addr_lsb; /* LSB of the reported address */
 199                 } _sigfault;
 200
 201                 /* SIGPOLL */
 202                 struct {
 203                         compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
 204                         int _fd;
 205                 } _sigpoll;
 206
 207                 /* SIGSYS */
 208                 struct {
 209                         compat_uptr_t _call_addr; /* calling user insn */
 210                         int _syscall;   /* triggering system call number */
 211                         compat_uint_t _arch;    /* AUDIT_ARCH_* of syscall */
 212                 } _sigsys;
 213         } _sifields;
 214 } compat_siginfo_t;
 215
 216 #define COMPAT_OFF_T_MAX        0x7fffffff
 217 #define COMPAT_LOFF_T_MAX       0x7fffffffffffffffL
 218
 219 /*
 220  * A pointer passed in from user mode. This should not
 221  * be used for syscall parameters, just declare them
 222  * as pointers because the syscall entry code will have
 223  * appropriately converted them already.
 224  */
 225
 226 static inline void __user *compat_ptr(compat_uptr_t uptr)
 227 {
 228         return (void __user *)(unsigned long)uptr;
 229 }
 230
 231 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 232 {
 233         return (u32)(unsigned long)uptr;
 234 }
 235
 236 #define compat_user_stack_pointer() (user_stack_pointer(task_pt_regs(current)))
 237
 238 static inline void __user *arch_compat_alloc_user_space(long len)
 239 {
 240         return (void __user *)compat_user_stack_pointer() - len;
 241 }
 242
 243 struct compat_ipc64_perm {
 244         compat_key_t key;
 245         __compat_uid32_t uid;
 246         __compat_gid32_t gid;
 247         __compat_uid32_t cuid;
 248         __compat_gid32_t cgid;
 249         unsigned short mode;
 250         unsigned short __pad1;
 251         unsigned short seq;
 252         unsigned short __pad2;
 253         compat_ulong_t unused1;
 254         compat_ulong_t unused2;
 255 };
 256
 257 struct compat_semid64_ds {
 258         struct compat_ipc64_perm sem_perm;
 259         compat_time_t  sem_otime;
 260         compat_ulong_t __unused1;
 261         compat_time_t  sem_ctime;
 262         compat_ulong_t __unused2;
 263         compat_ulong_t sem_nsems;
 264         compat_ulong_t __unused3;
 265         compat_ulong_t __unused4;
 266 };
 267
 268 struct compat_msqid64_ds {
 269         struct compat_ipc64_perm msg_perm;
 270         compat_time_t  msg_stime;
 271         compat_ulong_t __unused1;
 272         compat_time_t  msg_rtime;
 273         compat_ulong_t __unused2;
 274         compat_time_t  msg_ctime;
 275         compat_ulong_t __unused3;
 276         compat_ulong_t msg_cbytes;
 277         compat_ulong_t msg_qnum;
 278         compat_ulong_t msg_qbytes;
 279         compat_pid_t   msg_lspid;
 280         compat_pid_t   msg_lrpid;
 281         compat_ulong_t __unused4;
 282         compat_ulong_t __unused5;
 283 };
 284
 285 struct compat_shmid64_ds {
 286         struct compat_ipc64_perm shm_perm;
 287         compat_size_t  shm_segsz;
 288         compat_time_t  shm_atime;
 289         compat_ulong_t __unused1;
 290         compat_time_t  shm_dtime;
 291         compat_ulong_t __unused2;
 292         compat_time_t  shm_ctime;
 293         compat_ulong_t __unused3;
 294         compat_pid_t   shm_cpid;
 295         compat_pid_t   shm_lpid;
 296         compat_ulong_t shm_nattch;
 297         compat_ulong_t __unused4;
 298         compat_ulong_t __unused5;
 299 };
 300
 301 static inline int is_compat_task(void)
 302 {
 303         return test_thread_flag(TIF_32BIT);
 304 }
 305
 306 static inline int is_compat_thread(struct thread_info *thread)
 307 {
 308         return test_ti_thread_flag(thread, TIF_32BIT);
 309 }
 310
 311 #else /* !CONFIG_COMPAT */
 312
 313 static inline int is_compat_thread(struct thread_info *thread)
 314 {
 315         return 0;
 316 }
 317
 318 #endif /* CONFIG_COMPAT */
 319 #endif /* __KERNEL__ */
 320 #endif /* __ASM_COMPAT_H */