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