arch/arm64/include/asm/compat.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2012 ARM Ltd.
   4  */
   5 #ifndef __ASM_COMPAT_H
   6 #define __ASM_COMPAT_H
   7 #ifdef __KERNEL__
   8 #ifdef CONFIG_COMPAT
   9
  10 /*
  11  * Architecture specific compatibility types
  12  */
  13 #include <linux/types.h>
  14 #include <linux/sched.h>
  15 #include <linux/sched/task_stack.h>
  16
  17 #include <asm-generic/compat.h>
  18
  19 #define COMPAT_USER_HZ          100
  20 #ifdef __AARCH64EB__
  21 #define COMPAT_UTS_MACHINE      "armv8b\0\0"
  22 #else
  23 #define COMPAT_UTS_MACHINE      "armv8l\0\0"
  24 #endif
  25
  26 typedef u16             __compat_uid_t;
  27 typedef u16             __compat_gid_t;
  28 typedef u16             __compat_uid16_t;
  29 typedef u16             __compat_gid16_t;
  30 typedef u32             __compat_uid32_t;
  31 typedef u32             __compat_gid32_t;
  32 typedef u16             compat_mode_t;
  33 typedef u32             compat_dev_t;
  34 typedef s32             compat_nlink_t;
  35 typedef u16             compat_ipc_pid_t;
  36 typedef u32             compat_caddr_t;
  37 typedef __kernel_fsid_t compat_fsid_t;
  38 typedef s64             compat_s64;
  39 typedef u64             compat_u64;
  40
  41 struct compat_stat {
  42 #ifdef __AARCH64EB__
  43         short           st_dev;
  44         short           __pad1;
  45 #else
  46         compat_dev_t    st_dev;
  47 #endif
  48         compat_ino_t    st_ino;
  49         compat_mode_t   st_mode;
  50         compat_ushort_t st_nlink;
  51         __compat_uid16_t        st_uid;
  52         __compat_gid16_t        st_gid;
  53 #ifdef __AARCH64EB__
  54         short           st_rdev;
  55         short           __pad2;
  56 #else
  57         compat_dev_t    st_rdev;
  58 #endif
  59         compat_off_t    st_size;
  60         compat_off_t    st_blksize;
  61         compat_off_t    st_blocks;
  62         old_time32_t    st_atime;
  63         compat_ulong_t  st_atime_nsec;
  64         old_time32_t    st_mtime;
  65         compat_ulong_t  st_mtime_nsec;
  66         old_time32_t    st_ctime;
  67         compat_ulong_t  st_ctime_nsec;
  68         compat_ulong_t  __unused4[2];
  69 };
  70
  71 struct compat_flock {
  72         short           l_type;
  73         short           l_whence;
  74         compat_off_t    l_start;
  75         compat_off_t    l_len;
  76         compat_pid_t    l_pid;
  77 };
  78
  79 #define F_GETLK64       12      /*  using 'struct flock64' */
  80 #define F_SETLK64       13
  81 #define F_SETLKW64      14
  82
  83 struct compat_flock64 {
  84         short           l_type;
  85         short           l_whence;
  86         compat_loff_t   l_start;
  87         compat_loff_t   l_len;
  88         compat_pid_t    l_pid;
  89 };
  90
  91 struct compat_statfs {
  92         int             f_type;
  93         int             f_bsize;
  94         int             f_blocks;
  95         int             f_bfree;
  96         int             f_bavail;
  97         int             f_files;
  98         int             f_ffree;
  99         compat_fsid_t   f_fsid;
 100         int             f_namelen;      /* SunOS ignores this field. */
 101         int             f_frsize;
 102         int             f_flags;
 103         int             f_spare[4];
 104 };
 105
 106 #define COMPAT_RLIM_INFINITY            0xffffffff
 107
 108 typedef u32             compat_old_sigset_t;
 109
 110 #define _COMPAT_NSIG            64
 111 #define _COMPAT_NSIG_BPW        32
 112
 113 typedef u32             compat_sigset_word;
 114
 115 #define COMPAT_OFF_T_MAX        0x7fffffff
 116
 117 /*
 118  * A pointer passed in from user mode. This should not
 119  * be used for syscall parameters, just declare them
 120  * as pointers because the syscall entry code will have
 121  * appropriately converted them already.
 122  */
 123
 124 static inline void __user *compat_ptr(compat_uptr_t uptr)
 125 {
 126         return (void __user *)(unsigned long)uptr;
 127 }
 128
 129 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 130 {
 131         return (u32)(unsigned long)uptr;
 132 }
 133
 134 #define compat_user_stack_pointer() (user_stack_pointer(task_pt_regs(current)))
 135 #define COMPAT_MINSIGSTKSZ      2048
 136
 137 static inline void __user *arch_compat_alloc_user_space(long len)
 138 {
 139         return (void __user *)compat_user_stack_pointer() - len;
 140 }
 141
 142 struct compat_ipc64_perm {
 143         compat_key_t key;
 144         __compat_uid32_t uid;
 145         __compat_gid32_t gid;
 146         __compat_uid32_t cuid;
 147         __compat_gid32_t cgid;
 148         unsigned short mode;
 149         unsigned short __pad1;
 150         unsigned short seq;
 151         unsigned short __pad2;
 152         compat_ulong_t unused1;
 153         compat_ulong_t unused2;
 154 };
 155
 156 struct compat_semid64_ds {
 157         struct compat_ipc64_perm sem_perm;
 158         compat_ulong_t sem_otime;
 159         compat_ulong_t sem_otime_high;
 160         compat_ulong_t sem_ctime;
 161         compat_ulong_t sem_ctime_high;
 162         compat_ulong_t sem_nsems;
 163         compat_ulong_t __unused3;
 164         compat_ulong_t __unused4;
 165 };
 166
 167 struct compat_msqid64_ds {
 168         struct compat_ipc64_perm msg_perm;
 169         compat_ulong_t msg_stime;
 170         compat_ulong_t msg_stime_high;
 171         compat_ulong_t msg_rtime;
 172         compat_ulong_t msg_rtime_high;
 173         compat_ulong_t msg_ctime;
 174         compat_ulong_t msg_ctime_high;
 175         compat_ulong_t msg_cbytes;
 176         compat_ulong_t msg_qnum;
 177         compat_ulong_t msg_qbytes;
 178         compat_pid_t   msg_lspid;
 179         compat_pid_t   msg_lrpid;
 180         compat_ulong_t __unused4;
 181         compat_ulong_t __unused5;
 182 };
 183
 184 struct compat_shmid64_ds {
 185         struct compat_ipc64_perm shm_perm;
 186         compat_size_t  shm_segsz;
 187         compat_ulong_t shm_atime;
 188         compat_ulong_t shm_atime_high;
 189         compat_ulong_t shm_dtime;
 190         compat_ulong_t shm_dtime_high;
 191         compat_ulong_t shm_ctime;
 192         compat_ulong_t shm_ctime_high;
 193         compat_pid_t   shm_cpid;
 194         compat_pid_t   shm_lpid;
 195         compat_ulong_t shm_nattch;
 196         compat_ulong_t __unused4;
 197         compat_ulong_t __unused5;
 198 };
 199
 200 static inline int is_compat_task(void)
 201 {
 202         return test_thread_flag(TIF_32BIT);
 203 }
 204
 205 static inline int is_compat_thread(struct thread_info *thread)
 206 {
 207         return test_ti_thread_flag(thread, TIF_32BIT);
 208 }
 209
 210 #else /* !CONFIG_COMPAT */
 211
 212 static inline int is_compat_thread(struct thread_info *thread)
 213 {
 214         return 0;
 215 }
 216
 217 #endif /* CONFIG_COMPAT */
 218 #endif /* __KERNEL__ */
 219 #endif /* __ASM_COMPAT_H */