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
   8 #include <asm-generic/compat.h>
   9
  10 #ifdef CONFIG_COMPAT
  11
  12 /*
  13  * Architecture specific compatibility types
  14  */
  15 #include <linux/types.h>
  16 #include <linux/sched.h>
  17 #include <linux/sched/task_stack.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
  39 struct compat_stat {
  40 #ifdef __AARCH64EB__
  41         short           st_dev;
  42         short           __pad1;
  43 #else
  44         compat_dev_t    st_dev;
  45 #endif
  46         compat_ino_t    st_ino;
  47         compat_mode_t   st_mode;
  48         compat_ushort_t st_nlink;
  49         __compat_uid16_t        st_uid;
  50         __compat_gid16_t        st_gid;
  51 #ifdef __AARCH64EB__
  52         short           st_rdev;
  53         short           __pad2;
  54 #else
  55         compat_dev_t    st_rdev;
  56 #endif
  57         compat_off_t    st_size;
  58         compat_off_t    st_blksize;
  59         compat_off_t    st_blocks;
  60         old_time32_t    st_atime;
  61         compat_ulong_t  st_atime_nsec;
  62         old_time32_t    st_mtime;
  63         compat_ulong_t  st_mtime_nsec;
  64         old_time32_t    st_ctime;
  65         compat_ulong_t  st_ctime_nsec;
  66         compat_ulong_t  __unused4[2];
  67 };
  68
  69 struct compat_flock {
  70         short           l_type;
  71         short           l_whence;
  72         compat_off_t    l_start;
  73         compat_off_t    l_len;
  74         compat_pid_t    l_pid;
  75 };
  76
  77 #define F_GETLK64       12      /*  using 'struct flock64' */
  78 #define F_SETLK64       13
  79 #define F_SETLKW64      14
  80
  81 struct compat_flock64 {
  82         short           l_type;
  83         short           l_whence;
  84         compat_loff_t   l_start;
  85         compat_loff_t   l_len;
  86         compat_pid_t    l_pid;
  87 };
  88
  89 struct compat_statfs {
  90         int             f_type;
  91         int             f_bsize;
  92         int             f_blocks;
  93         int             f_bfree;
  94         int             f_bavail;
  95         int             f_files;
  96         int             f_ffree;
  97         compat_fsid_t   f_fsid;
  98         int             f_namelen;      /* SunOS ignores this field. */
  99         int             f_frsize;
 100         int             f_flags;
 101         int             f_spare[4];
 102 };
 103
 104 #define COMPAT_RLIM_INFINITY            0xffffffff
 105
 106 typedef u32             compat_old_sigset_t;
 107
 108 #define _COMPAT_NSIG            64
 109 #define _COMPAT_NSIG_BPW        32
 110
 111 typedef u32             compat_sigset_word;
 112
 113 #define COMPAT_OFF_T_MAX        0x7fffffff
 114
 115 #define compat_user_stack_pointer() (user_stack_pointer(task_pt_regs(current)))
 116 #define COMPAT_MINSIGSTKSZ      2048
 117
 118 static inline void __user *arch_compat_alloc_user_space(long len)
 119 {
 120         return (void __user *)compat_user_stack_pointer() - len;
 121 }
 122
 123 struct compat_ipc64_perm {
 124         compat_key_t key;
 125         __compat_uid32_t uid;
 126         __compat_gid32_t gid;
 127         __compat_uid32_t cuid;
 128         __compat_gid32_t cgid;
 129         unsigned short mode;
 130         unsigned short __pad1;
 131         unsigned short seq;
 132         unsigned short __pad2;
 133         compat_ulong_t unused1;
 134         compat_ulong_t unused2;
 135 };
 136
 137 struct compat_semid64_ds {
 138         struct compat_ipc64_perm sem_perm;
 139         compat_ulong_t sem_otime;
 140         compat_ulong_t sem_otime_high;
 141         compat_ulong_t sem_ctime;
 142         compat_ulong_t sem_ctime_high;
 143         compat_ulong_t sem_nsems;
 144         compat_ulong_t __unused3;
 145         compat_ulong_t __unused4;
 146 };
 147
 148 struct compat_msqid64_ds {
 149         struct compat_ipc64_perm msg_perm;
 150         compat_ulong_t msg_stime;
 151         compat_ulong_t msg_stime_high;
 152         compat_ulong_t msg_rtime;
 153         compat_ulong_t msg_rtime_high;
 154         compat_ulong_t msg_ctime;
 155         compat_ulong_t msg_ctime_high;
 156         compat_ulong_t msg_cbytes;
 157         compat_ulong_t msg_qnum;
 158         compat_ulong_t msg_qbytes;
 159         compat_pid_t   msg_lspid;
 160         compat_pid_t   msg_lrpid;
 161         compat_ulong_t __unused4;
 162         compat_ulong_t __unused5;
 163 };
 164
 165 struct compat_shmid64_ds {
 166         struct compat_ipc64_perm shm_perm;
 167         compat_size_t  shm_segsz;
 168         compat_ulong_t shm_atime;
 169         compat_ulong_t shm_atime_high;
 170         compat_ulong_t shm_dtime;
 171         compat_ulong_t shm_dtime_high;
 172         compat_ulong_t shm_ctime;
 173         compat_ulong_t shm_ctime_high;
 174         compat_pid_t   shm_cpid;
 175         compat_pid_t   shm_lpid;
 176         compat_ulong_t shm_nattch;
 177         compat_ulong_t __unused4;
 178         compat_ulong_t __unused5;
 179 };
 180
 181 static inline int is_compat_task(void)
 182 {
 183         return test_thread_flag(TIF_32BIT);
 184 }
 185
 186 static inline int is_compat_thread(struct thread_info *thread)
 187 {
 188         return test_ti_thread_flag(thread, TIF_32BIT);
 189 }
 190
 191 #else /* !CONFIG_COMPAT */
 192
 193 static inline int is_compat_thread(struct thread_info *thread)
 194 {
 195         return 0;
 196 }
 197
 198 #endif /* CONFIG_COMPAT */
 199 #endif /* __ASM_COMPAT_H */