arch/x86/include/asm/compat.h

   1 #ifndef _ASM_X86_COMPAT_H
   2 #define _ASM_X86_COMPAT_H
   3
   4 /*
   5  * Architecture specific compatibility types
   6  */
   7 #include <linux/types.h>
   8 #include <linux/sched.h>
   9 #include <asm/processor.h>
  10 #include <asm/user32.h>
  11 #include <asm/unistd.h>
  12
  13 #define COMPAT_USER_HZ          100
  14 #define COMPAT_UTS_MACHINE      "i686\0\0"
  15
  16 typedef u32             compat_size_t;
  17 typedef s32             compat_ssize_t;
  18 typedef s32             compat_time_t;
  19 typedef s32             compat_clock_t;
  20 typedef s32             compat_pid_t;
  21 typedef u16             __compat_uid_t;
  22 typedef u16             __compat_gid_t;
  23 typedef u32             __compat_uid32_t;
  24 typedef u32             __compat_gid32_t;
  25 typedef u16             compat_mode_t;
  26 typedef u32             compat_ino_t;
  27 typedef u16             compat_dev_t;
  28 typedef s32             compat_off_t;
  29 typedef s64             compat_loff_t;
  30 typedef u16             compat_nlink_t;
  31 typedef u16             compat_ipc_pid_t;
  32 typedef s32             compat_daddr_t;
  33 typedef u32             compat_caddr_t;
  34 typedef __kernel_fsid_t compat_fsid_t;
  35 typedef s32             compat_timer_t;
  36 typedef s32             compat_key_t;
  37
  38 typedef s32             compat_int_t;
  39 typedef s32             compat_long_t;
  40 typedef s64 __attribute__((aligned(4))) compat_s64;
  41 typedef u32             compat_uint_t;
  42 typedef u32             compat_ulong_t;
  43 typedef u64 __attribute__((aligned(4))) compat_u64;
  44
  45 struct compat_timespec {
  46         compat_time_t   tv_sec;
  47         s32             tv_nsec;
  48 };
  49
  50 struct compat_timeval {
  51         compat_time_t   tv_sec;
  52         s32             tv_usec;
  53 };
  54
  55 struct compat_stat {
  56         compat_dev_t    st_dev;
  57         u16             __pad1;
  58         compat_ino_t    st_ino;
  59         compat_mode_t   st_mode;
  60         compat_nlink_t  st_nlink;
  61         __compat_uid_t  st_uid;
  62         __compat_gid_t  st_gid;
  63         compat_dev_t    st_rdev;
  64         u16             __pad2;
  65         u32             st_size;
  66         u32             st_blksize;
  67         u32             st_blocks;
  68         u32             st_atime;
  69         u32             st_atime_nsec;
  70         u32             st_mtime;
  71         u32             st_mtime_nsec;
  72         u32             st_ctime;
  73         u32             st_ctime_nsec;
  74         u32             __unused4;
  75         u32             __unused5;
  76 };
  77
  78 struct compat_flock {
  79         short           l_type;
  80         short           l_whence;
  81         compat_off_t    l_start;
  82         compat_off_t    l_len;
  83         compat_pid_t    l_pid;
  84 };
  85
  86 #define F_GETLK64       12      /*  using 'struct flock64' */
  87 #define F_SETLK64       13
  88 #define F_SETLKW64      14
  89
  90 /*
  91  * IA32 uses 4 byte alignment for 64 bit quantities,
  92  * so we need to pack this structure.
  93  */
  94 struct compat_flock64 {
  95         short           l_type;
  96         short           l_whence;
  97         compat_loff_t   l_start;
  98         compat_loff_t   l_len;
  99         compat_pid_t    l_pid;
 100 } __attribute__((packed));
 101
 102 struct compat_statfs {
 103         int             f_type;
 104         int             f_bsize;
 105         int             f_blocks;
 106         int             f_bfree;
 107         int             f_bavail;
 108         int             f_files;
 109         int             f_ffree;
 110         compat_fsid_t   f_fsid;
 111         int             f_namelen;      /* SunOS ignores this field. */
 112         int             f_frsize;
 113         int             f_flags;
 114         int             f_spare[4];
 115 };
 116
 117 #define COMPAT_RLIM_OLD_INFINITY        0x7fffffff
 118 #define COMPAT_RLIM_INFINITY            0xffffffff
 119
 120 typedef u32             compat_old_sigset_t;    /* at least 32 bits */
 121
 122 #define _COMPAT_NSIG            64
 123 #define _COMPAT_NSIG_BPW        32
 124
 125 typedef u32               compat_sigset_word;
 126
 127 #define COMPAT_OFF_T_MAX        0x7fffffff
 128 #define COMPAT_LOFF_T_MAX       0x7fffffffffffffffL
 129
 130 struct compat_ipc64_perm {
 131         compat_key_t key;
 132         __compat_uid32_t uid;
 133         __compat_gid32_t gid;
 134         __compat_uid32_t cuid;
 135         __compat_gid32_t cgid;
 136         unsigned short mode;
 137         unsigned short __pad1;
 138         unsigned short seq;
 139         unsigned short __pad2;
 140         compat_ulong_t unused1;
 141         compat_ulong_t unused2;
 142 };
 143
 144 struct compat_semid64_ds {
 145         struct compat_ipc64_perm sem_perm;
 146         compat_time_t  sem_otime;
 147         compat_ulong_t __unused1;
 148         compat_time_t  sem_ctime;
 149         compat_ulong_t __unused2;
 150         compat_ulong_t sem_nsems;
 151         compat_ulong_t __unused3;
 152         compat_ulong_t __unused4;
 153 };
 154
 155 struct compat_msqid64_ds {
 156         struct compat_ipc64_perm msg_perm;
 157         compat_time_t  msg_stime;
 158         compat_ulong_t __unused1;
 159         compat_time_t  msg_rtime;
 160         compat_ulong_t __unused2;
 161         compat_time_t  msg_ctime;
 162         compat_ulong_t __unused3;
 163         compat_ulong_t msg_cbytes;
 164         compat_ulong_t msg_qnum;
 165         compat_ulong_t msg_qbytes;
 166         compat_pid_t   msg_lspid;
 167         compat_pid_t   msg_lrpid;
 168         compat_ulong_t __unused4;
 169         compat_ulong_t __unused5;
 170 };
 171
 172 struct compat_shmid64_ds {
 173         struct compat_ipc64_perm shm_perm;
 174         compat_size_t  shm_segsz;
 175         compat_time_t  shm_atime;
 176         compat_ulong_t __unused1;
 177         compat_time_t  shm_dtime;
 178         compat_ulong_t __unused2;
 179         compat_time_t  shm_ctime;
 180         compat_ulong_t __unused3;
 181         compat_pid_t   shm_cpid;
 182         compat_pid_t   shm_lpid;
 183         compat_ulong_t shm_nattch;
 184         compat_ulong_t __unused4;
 185         compat_ulong_t __unused5;
 186 };
 187
 188 /*
 189  * The type of struct elf_prstatus.pr_reg in compatible core dumps.
 190  */
 191 #ifdef CONFIG_X86_X32_ABI
 192 typedef struct user_regs_struct compat_elf_gregset_t;
 193
 194 #define PR_REG_SIZE(S) (test_thread_flag(TIF_IA32) ? 68 : 216)
 195 #define PRSTATUS_SIZE(S) (test_thread_flag(TIF_IA32) ? 144 : 296)
 196 #define SET_PR_FPVALID(S,V) \
 197   do { *(int *) (((void *) &((S)->pr_reg)) + PR_REG_SIZE(0)) = (V); } \
 198   while (0)
 199
 200 #define COMPAT_USE_64BIT_TIME \
 201         (!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT))
 202 #else
 203 typedef struct user_regs_struct32 compat_elf_gregset_t;
 204 #endif
 205
 206 /*
 207  * A pointer passed in from user mode. This should not
 208  * be used for syscall parameters, just declare them
 209  * as pointers because the syscall entry code will have
 210  * appropriately converted them already.
 211  */
 212 typedef u32             compat_uptr_t;
 213
 214 static inline void __user *compat_ptr(compat_uptr_t uptr)
 215 {
 216         return (void __user *)(unsigned long)uptr;
 217 }
 218
 219 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 220 {
 221         return (u32)(unsigned long)uptr;
 222 }
 223
 224 static inline void __user *arch_compat_alloc_user_space(long len)
 225 {
 226         compat_uptr_t sp;
 227
 228         if (test_thread_flag(TIF_IA32)) {
 229                 sp = task_pt_regs(current)->sp;
 230         } else {
 231                 /* -128 for the x32 ABI redzone */
 232                 sp = percpu_read(old_rsp) - 128;
 233         }
 234
 235         return (void __user *)round_down(sp - len, 16);
 236 }
 237
 238 static inline bool is_compat_task(void)
 239 {
 240 #ifdef CONFIG_IA32_EMULATION
 241         if (current_thread_info()->status & TS_COMPAT)
 242                 return true;
 243 #endif
 244 #ifdef CONFIG_X86_X32_ABI
 245         if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
 246                 return true;
 247 #endif
 248         return false;
 249 }
 250
 251 #endif /* _ASM_X86_COMPAT_H */