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 #include <linux/ptrace.h>
  27
  28 #define COMPAT_USER_HZ          100
  29 #ifdef __AARCH64EB__
  30 #define COMPAT_UTS_MACHINE      "armv8b\0\0"
  31 #else
  32 #define COMPAT_UTS_MACHINE      "armv8l\0\0"
  33 #endif
  34
  35 typedef u32             compat_size_t;
  36 typedef s32             compat_ssize_t;
  37 typedef s32             compat_time_t;
  38 typedef s32             compat_clock_t;
  39 typedef s32             compat_pid_t;
  40 typedef u16             __compat_uid_t;
  41 typedef u16             __compat_gid_t;
  42 typedef u16             __compat_uid16_t;
  43 typedef u16             __compat_gid16_t;
  44 typedef u32             __compat_uid32_t;
  45 typedef u32             __compat_gid32_t;
  46 typedef u16             compat_mode_t;
  47 typedef u32             compat_ino_t;
  48 typedef u32             compat_dev_t;
  49 typedef s32             compat_off_t;
  50 typedef s64             compat_loff_t;
  51 typedef s32             compat_nlink_t;
  52 typedef u16             compat_ipc_pid_t;
  53 typedef s32             compat_daddr_t;
  54 typedef u32             compat_caddr_t;
  55 typedef __kernel_fsid_t compat_fsid_t;
  56 typedef s32             compat_key_t;
  57 typedef s32             compat_timer_t;
  58
  59 typedef s16             compat_short_t;
  60 typedef s32             compat_int_t;
  61 typedef s32             compat_long_t;
  62 typedef s64             compat_s64;
  63 typedef u16             compat_ushort_t;
  64 typedef u32             compat_uint_t;
  65 typedef u32             compat_ulong_t;
  66 typedef u64             compat_u64;
  67 typedef u32             compat_uptr_t;
  68
  69 struct compat_timespec {
  70         compat_time_t   tv_sec;
  71         s32             tv_nsec;
  72 };
  73
  74 struct compat_timeval {
  75         compat_time_t   tv_sec;
  76         s32             tv_usec;
  77 };
  78
  79 struct compat_stat {
  80 #ifdef __AARCH64EB__
  81         short           st_dev;
  82         short           __pad1;
  83 #else
  84         compat_dev_t    st_dev;
  85 #endif
  86         compat_ino_t    st_ino;
  87         compat_mode_t   st_mode;
  88         compat_ushort_t st_nlink;
  89         __compat_uid16_t        st_uid;
  90         __compat_gid16_t        st_gid;
  91 #ifdef __AARCH64EB__
  92         short           st_rdev;
  93         short           __pad2;
  94 #else
  95         compat_dev_t    st_rdev;
  96 #endif
  97         compat_off_t    st_size;
  98         compat_off_t    st_blksize;
  99         compat_off_t    st_blocks;
 100         compat_time_t   st_atime;
 101         compat_ulong_t  st_atime_nsec;
 102         compat_time_t   st_mtime;
 103         compat_ulong_t  st_mtime_nsec;
 104         compat_time_t   st_ctime;
 105         compat_ulong_t  st_ctime_nsec;
 106         compat_ulong_t  __unused4[2];
 107 };
 108
 109 struct compat_flock {
 110         short           l_type;
 111         short           l_whence;
 112         compat_off_t    l_start;
 113         compat_off_t    l_len;
 114         compat_pid_t    l_pid;
 115 };
 116
 117 #define F_GETLK64       12      /*  using 'struct flock64' */
 118 #define F_SETLK64       13
 119 #define F_SETLKW64      14
 120
 121 struct compat_flock64 {
 122         short           l_type;
 123         short           l_whence;
 124         compat_loff_t   l_start;
 125         compat_loff_t   l_len;
 126         compat_pid_t    l_pid;
 127 };
 128
 129 struct compat_statfs {
 130         int             f_type;
 131         int             f_bsize;
 132         int             f_blocks;
 133         int             f_bfree;
 134         int             f_bavail;
 135         int             f_files;
 136         int             f_ffree;
 137         compat_fsid_t   f_fsid;
 138         int             f_namelen;      /* SunOS ignores this field. */
 139         int             f_frsize;
 140         int             f_flags;
 141         int             f_spare[4];
 142 };
 143
 144 #define COMPAT_RLIM_INFINITY            0xffffffff
 145
 146 typedef u32             compat_old_sigset_t;
 147
 148 #define _COMPAT_NSIG            64
 149 #define _COMPAT_NSIG_BPW        32
 150
 151 typedef u32             compat_sigset_word;
 152
 153 typedef union compat_sigval {
 154         compat_int_t    sival_int;
 155         compat_uptr_t   sival_ptr;
 156 } compat_sigval_t;
 157
 158 typedef struct compat_siginfo {
 159         int si_signo;
 160         int si_errno;
 161         int si_code;
 162
 163         union {
 164                 /* The padding is the same size as AArch64. */
 165                 int _pad[128/sizeof(int) - 3];
 166
 167                 /* kill() */
 168                 struct {
 169                         compat_pid_t _pid;      /* sender's pid */
 170                         __compat_uid32_t _uid;  /* sender's uid */
 171                 } _kill;
 172
 173                 /* POSIX.1b timers */
 174                 struct {
 175                         compat_timer_t _tid;    /* timer id */
 176                         int _overrun;           /* overrun count */
 177                         compat_sigval_t _sigval;        /* same as below */
 178                         int _sys_private;       /* not to be passed to user */
 179                 } _timer;
 180
 181                 /* POSIX.1b signals */
 182                 struct {
 183                         compat_pid_t _pid;      /* sender's pid */
 184                         __compat_uid32_t _uid;  /* sender's uid */
 185                         compat_sigval_t _sigval;
 186                 } _rt;
 187
 188                 /* SIGCHLD */
 189                 struct {
 190                         compat_pid_t _pid;      /* which child */
 191                         __compat_uid32_t _uid;  /* sender's uid */
 192                         int _status;            /* exit code */
 193                         compat_clock_t _utime;
 194                         compat_clock_t _stime;
 195                 } _sigchld;
 196
 197                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
 198                 struct {
 199                         compat_uptr_t _addr; /* faulting insn/memory ref. */
 200                         short _addr_lsb; /* LSB of the reported address */
 201                 } _sigfault;
 202
 203                 /* SIGPOLL */
 204                 struct {
 205                         compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
 206                         int _fd;
 207                 } _sigpoll;
 208
 209                 /* SIGSYS */
 210                 struct {
 211                         compat_uptr_t _call_addr; /* calling user insn */
 212                         int _syscall;   /* triggering system call number */
 213                         compat_uint_t _arch;    /* AUDIT_ARCH_* of syscall */
 214                 } _sigsys;
 215         } _sifields;
 216 } compat_siginfo_t;
 217
 218 #define COMPAT_OFF_T_MAX        0x7fffffff
 219 #define COMPAT_LOFF_T_MAX       0x7fffffffffffffffL
 220
 221 /*
 222  * A pointer passed in from user mode. This should not
 223  * be used for syscall parameters, just declare them
 224  * as pointers because the syscall entry code will have
 225  * appropriately converted them already.
 226  */
 227
 228 static inline void __user *compat_ptr(compat_uptr_t uptr)
 229 {
 230         return (void __user *)(unsigned long)uptr;
 231 }
 232
 233 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 234 {
 235         return (u32)(unsigned long)uptr;
 236 }
 237
 238 #define compat_user_stack_pointer() (user_stack_pointer(current_pt_regs()))
 239
 240 static inline void __user *arch_compat_alloc_user_space(long len)
 241 {
 242         return (void __user *)compat_user_stack_pointer() - len;
 243 }
 244
 245 struct compat_ipc64_perm {
 246         compat_key_t key;
 247         __compat_uid32_t uid;
 248         __compat_gid32_t gid;
 249         __compat_uid32_t cuid;
 250         __compat_gid32_t cgid;
 251         unsigned short mode;
 252         unsigned short __pad1;
 253         unsigned short seq;
 254         unsigned short __pad2;
 255         compat_ulong_t unused1;
 256         compat_ulong_t unused2;
 257 };
 258
 259 struct compat_semid64_ds {
 260         struct compat_ipc64_perm sem_perm;
 261         compat_time_t  sem_otime;
 262         compat_ulong_t __unused1;
 263         compat_time_t  sem_ctime;
 264         compat_ulong_t __unused2;
 265         compat_ulong_t sem_nsems;
 266         compat_ulong_t __unused3;
 267         compat_ulong_t __unused4;
 268 };
 269
 270 struct compat_msqid64_ds {
 271         struct compat_ipc64_perm msg_perm;
 272         compat_time_t  msg_stime;
 273         compat_ulong_t __unused1;
 274         compat_time_t  msg_rtime;
 275         compat_ulong_t __unused2;
 276         compat_time_t  msg_ctime;
 277         compat_ulong_t __unused3;
 278         compat_ulong_t msg_cbytes;
 279         compat_ulong_t msg_qnum;
 280         compat_ulong_t msg_qbytes;
 281         compat_pid_t   msg_lspid;
 282         compat_pid_t   msg_lrpid;
 283         compat_ulong_t __unused4;
 284         compat_ulong_t __unused5;
 285 };
 286
 287 struct compat_shmid64_ds {
 288         struct compat_ipc64_perm shm_perm;
 289         compat_size_t  shm_segsz;
 290         compat_time_t  shm_atime;
 291         compat_ulong_t __unused1;
 292         compat_time_t  shm_dtime;
 293         compat_ulong_t __unused2;
 294         compat_time_t  shm_ctime;
 295         compat_ulong_t __unused3;
 296         compat_pid_t   shm_cpid;
 297         compat_pid_t   shm_lpid;
 298         compat_ulong_t shm_nattch;
 299         compat_ulong_t __unused4;
 300         compat_ulong_t __unused5;
 301 };
 302
 303 static inline int is_compat_task(void)
 304 {
 305         return test_thread_flag(TIF_32BIT);
 306 }
 307
 308 static inline int is_compat_thread(struct thread_info *thread)
 309 {
 310         return test_ti_thread_flag(thread, TIF_32BIT);
 311 }
 312
 313 #else /* !CONFIG_COMPAT */
 314
 315 static inline int is_compat_thread(struct thread_info *thread)
 316 {
 317         return 0;
 318 }
 319
 320 #endif /* CONFIG_COMPAT */
 321 #endif /* __KERNEL__ */
 322 #endif /* __ASM_COMPAT_H */