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/sched/task_stack.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 #define COMPAT_OFF_T_MAX        0x7fffffff
 154
 155 /*
 156  * A pointer passed in from user mode. This should not
 157  * be used for syscall parameters, just declare them
 158  * as pointers because the syscall entry code will have
 159  * appropriately converted them already.
 160  */
 161
 162 static inline void __user *compat_ptr(compat_uptr_t uptr)
 163 {
 164         return (void __user *)(unsigned long)uptr;
 165 }
 166
 167 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 168 {
 169         return (u32)(unsigned long)uptr;
 170 }
 171
 172 #define compat_user_stack_pointer() (user_stack_pointer(task_pt_regs(current)))
 173
 174 static inline void __user *arch_compat_alloc_user_space(long len)
 175 {
 176         return (void __user *)compat_user_stack_pointer() - len;
 177 }
 178
 179 struct compat_ipc64_perm {
 180         compat_key_t key;
 181         __compat_uid32_t uid;
 182         __compat_gid32_t gid;
 183         __compat_uid32_t cuid;
 184         __compat_gid32_t cgid;
 185         unsigned short mode;
 186         unsigned short __pad1;
 187         unsigned short seq;
 188         unsigned short __pad2;
 189         compat_ulong_t unused1;
 190         compat_ulong_t unused2;
 191 };
 192
 193 struct compat_semid64_ds {
 194         struct compat_ipc64_perm sem_perm;
 195         compat_time_t  sem_otime;
 196         compat_ulong_t __unused1;
 197         compat_time_t  sem_ctime;
 198         compat_ulong_t __unused2;
 199         compat_ulong_t sem_nsems;
 200         compat_ulong_t __unused3;
 201         compat_ulong_t __unused4;
 202 };
 203
 204 struct compat_msqid64_ds {
 205         struct compat_ipc64_perm msg_perm;
 206         compat_time_t  msg_stime;
 207         compat_ulong_t __unused1;
 208         compat_time_t  msg_rtime;
 209         compat_ulong_t __unused2;
 210         compat_time_t  msg_ctime;
 211         compat_ulong_t __unused3;
 212         compat_ulong_t msg_cbytes;
 213         compat_ulong_t msg_qnum;
 214         compat_ulong_t msg_qbytes;
 215         compat_pid_t   msg_lspid;
 216         compat_pid_t   msg_lrpid;
 217         compat_ulong_t __unused4;
 218         compat_ulong_t __unused5;
 219 };
 220
 221 struct compat_shmid64_ds {
 222         struct compat_ipc64_perm shm_perm;
 223         compat_size_t  shm_segsz;
 224         compat_time_t  shm_atime;
 225         compat_ulong_t __unused1;
 226         compat_time_t  shm_dtime;
 227         compat_ulong_t __unused2;
 228         compat_time_t  shm_ctime;
 229         compat_ulong_t __unused3;
 230         compat_pid_t   shm_cpid;
 231         compat_pid_t   shm_lpid;
 232         compat_ulong_t shm_nattch;
 233         compat_ulong_t __unused4;
 234         compat_ulong_t __unused5;
 235 };
 236
 237 static inline int is_compat_task(void)
 238 {
 239         return test_thread_flag(TIF_32BIT);
 240 }
 241
 242 static inline int is_compat_thread(struct thread_info *thread)
 243 {
 244         return test_ti_thread_flag(thread, TIF_32BIT);
 245 }
 246
 247 #else /* !CONFIG_COMPAT */
 248
 249 static inline int is_compat_thread(struct thread_info *thread)
 250 {
 251         return 0;
 252 }
 253
 254 #endif /* CONFIG_COMPAT */
 255 #endif /* __KERNEL__ */
 256 #endif /* __ASM_COMPAT_H */