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_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_stat {
  69 #ifdef __AARCH64EB__
  70         short           st_dev;
  71         short           __pad1;
  72 #else
  73         compat_dev_t    st_dev;
  74 #endif
  75         compat_ino_t    st_ino;
  76         compat_mode_t   st_mode;
  77         compat_ushort_t st_nlink;
  78         __compat_uid16_t        st_uid;
  79         __compat_gid16_t        st_gid;
  80 #ifdef __AARCH64EB__
  81         short           st_rdev;
  82         short           __pad2;
  83 #else
  84         compat_dev_t    st_rdev;
  85 #endif
  86         compat_off_t    st_size;
  87         compat_off_t    st_blksize;
  88         compat_off_t    st_blocks;
  89         compat_time_t   st_atime;
  90         compat_ulong_t  st_atime_nsec;
  91         compat_time_t   st_mtime;
  92         compat_ulong_t  st_mtime_nsec;
  93         compat_time_t   st_ctime;
  94         compat_ulong_t  st_ctime_nsec;
  95         compat_ulong_t  __unused4[2];
  96 };
  97
  98 struct compat_flock {
  99         short           l_type;
 100         short           l_whence;
 101         compat_off_t    l_start;
 102         compat_off_t    l_len;
 103         compat_pid_t    l_pid;
 104 };
 105
 106 #define F_GETLK64       12      /*  using 'struct flock64' */
 107 #define F_SETLK64       13
 108 #define F_SETLKW64      14
 109
 110 struct compat_flock64 {
 111         short           l_type;
 112         short           l_whence;
 113         compat_loff_t   l_start;
 114         compat_loff_t   l_len;
 115         compat_pid_t    l_pid;
 116 };
 117
 118 struct compat_statfs {
 119         int             f_type;
 120         int             f_bsize;
 121         int             f_blocks;
 122         int             f_bfree;
 123         int             f_bavail;
 124         int             f_files;
 125         int             f_ffree;
 126         compat_fsid_t   f_fsid;
 127         int             f_namelen;      /* SunOS ignores this field. */
 128         int             f_frsize;
 129         int             f_flags;
 130         int             f_spare[4];
 131 };
 132
 133 #define COMPAT_RLIM_INFINITY            0xffffffff
 134
 135 typedef u32             compat_old_sigset_t;
 136
 137 #define _COMPAT_NSIG            64
 138 #define _COMPAT_NSIG_BPW        32
 139
 140 typedef u32             compat_sigset_word;
 141
 142 #define COMPAT_OFF_T_MAX        0x7fffffff
 143
 144 /*
 145  * A pointer passed in from user mode. This should not
 146  * be used for syscall parameters, just declare them
 147  * as pointers because the syscall entry code will have
 148  * appropriately converted them already.
 149  */
 150
 151 static inline void __user *compat_ptr(compat_uptr_t uptr)
 152 {
 153         return (void __user *)(unsigned long)uptr;
 154 }
 155
 156 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 157 {
 158         return (u32)(unsigned long)uptr;
 159 }
 160
 161 #define compat_user_stack_pointer() (user_stack_pointer(task_pt_regs(current)))
 162 #define COMPAT_MINSIGSTKSZ      2048
 163
 164 static inline void __user *arch_compat_alloc_user_space(long len)
 165 {
 166         return (void __user *)compat_user_stack_pointer() - len;
 167 }
 168
 169 struct compat_ipc64_perm {
 170         compat_key_t key;
 171         __compat_uid32_t uid;
 172         __compat_gid32_t gid;
 173         __compat_uid32_t cuid;
 174         __compat_gid32_t cgid;
 175         unsigned short mode;
 176         unsigned short __pad1;
 177         unsigned short seq;
 178         unsigned short __pad2;
 179         compat_ulong_t unused1;
 180         compat_ulong_t unused2;
 181 };
 182
 183 struct compat_semid64_ds {
 184         struct compat_ipc64_perm sem_perm;
 185         compat_ulong_t sem_otime;
 186         compat_ulong_t sem_otime_high;
 187         compat_ulong_t sem_ctime;
 188         compat_ulong_t sem_ctime_high;
 189         compat_ulong_t sem_nsems;
 190         compat_ulong_t __unused3;
 191         compat_ulong_t __unused4;
 192 };
 193
 194 struct compat_msqid64_ds {
 195         struct compat_ipc64_perm msg_perm;
 196         compat_ulong_t msg_stime;
 197         compat_ulong_t msg_stime_high;
 198         compat_ulong_t msg_rtime;
 199         compat_ulong_t msg_rtime_high;
 200         compat_ulong_t msg_ctime;
 201         compat_ulong_t msg_ctime_high;
 202         compat_ulong_t msg_cbytes;
 203         compat_ulong_t msg_qnum;
 204         compat_ulong_t msg_qbytes;
 205         compat_pid_t   msg_lspid;
 206         compat_pid_t   msg_lrpid;
 207         compat_ulong_t __unused4;
 208         compat_ulong_t __unused5;
 209 };
 210
 211 struct compat_shmid64_ds {
 212         struct compat_ipc64_perm shm_perm;
 213         compat_size_t  shm_segsz;
 214         compat_ulong_t shm_atime;
 215         compat_ulong_t shm_atime_high;
 216         compat_ulong_t shm_dtime;
 217         compat_ulong_t shm_dtime_high;
 218         compat_ulong_t shm_ctime;
 219         compat_ulong_t shm_ctime_high;
 220         compat_pid_t   shm_cpid;
 221         compat_pid_t   shm_lpid;
 222         compat_ulong_t shm_nattch;
 223         compat_ulong_t __unused4;
 224         compat_ulong_t __unused5;
 225 };
 226
 227 static inline int is_compat_task(void)
 228 {
 229         return test_thread_flag(TIF_32BIT);
 230 }
 231
 232 static inline int is_compat_thread(struct thread_info *thread)
 233 {
 234         return test_ti_thread_flag(thread, TIF_32BIT);
 235 }
 236
 237 #else /* !CONFIG_COMPAT */
 238
 239 static inline int is_compat_thread(struct thread_info *thread)
 240 {
 241         return 0;
 242 }
 243
 244 #endif /* CONFIG_COMPAT */
 245 #endif /* __KERNEL__ */
 246 #endif /* __ASM_COMPAT_H */