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 typedef u32             compat_uptr_t;
  45
  46 struct compat_timespec {
  47         compat_time_t   tv_sec;
  48         s32             tv_nsec;
  49 };
  50
  51 struct compat_timeval {
  52         compat_time_t   tv_sec;
  53         s32             tv_usec;
  54 };
  55
  56 struct compat_stat {
  57         compat_dev_t    st_dev;
  58         u16             __pad1;
  59         compat_ino_t    st_ino;
  60         compat_mode_t   st_mode;
  61         compat_nlink_t  st_nlink;
  62         __compat_uid_t  st_uid;
  63         __compat_gid_t  st_gid;
  64         compat_dev_t    st_rdev;
  65         u16             __pad2;
  66         u32             st_size;
  67         u32             st_blksize;
  68         u32             st_blocks;
  69         u32             st_atime;
  70         u32             st_atime_nsec;
  71         u32             st_mtime;
  72         u32             st_mtime_nsec;
  73         u32             st_ctime;
  74         u32             st_ctime_nsec;
  75         u32             __unused4;
  76         u32             __unused5;
  77 };
  78
  79 struct compat_flock {
  80         short           l_type;
  81         short           l_whence;
  82         compat_off_t    l_start;
  83         compat_off_t    l_len;
  84         compat_pid_t    l_pid;
  85 };
  86
  87 #define F_GETLK64       12      /*  using 'struct flock64' */
  88 #define F_SETLK64       13
  89 #define F_SETLKW64      14
  90
  91 /*
  92  * IA32 uses 4 byte alignment for 64 bit quantities,
  93  * so we need to pack this structure.
  94  */
  95 struct compat_flock64 {
  96         short           l_type;
  97         short           l_whence;
  98         compat_loff_t   l_start;
  99         compat_loff_t   l_len;
 100         compat_pid_t    l_pid;
 101 } __attribute__((packed));
 102
 103 struct compat_statfs {
 104         int             f_type;
 105         int             f_bsize;
 106         int             f_blocks;
 107         int             f_bfree;
 108         int             f_bavail;
 109         int             f_files;
 110         int             f_ffree;
 111         compat_fsid_t   f_fsid;
 112         int             f_namelen;      /* SunOS ignores this field. */
 113         int             f_frsize;
 114         int             f_flags;
 115         int             f_spare[4];
 116 };
 117
 118 #define COMPAT_RLIM_OLD_INFINITY        0x7fffffff
 119 #define COMPAT_RLIM_INFINITY            0xffffffff
 120
 121 typedef u32             compat_old_sigset_t;    /* at least 32 bits */
 122
 123 #define _COMPAT_NSIG            64
 124 #define _COMPAT_NSIG_BPW        32
 125
 126 typedef u32               compat_sigset_word;
 127
 128 typedef union compat_sigval {
 129         compat_int_t    sival_int;
 130         compat_uptr_t   sival_ptr;
 131 } compat_sigval_t;
 132
 133 typedef struct compat_siginfo {
 134         int si_signo;
 135         int si_errno;
 136         int si_code;
 137
 138         union {
 139                 int _pad[128/sizeof(int) - 3];
 140
 141                 /* kill() */
 142                 struct {
 143                         unsigned int _pid;      /* sender's pid */
 144                         unsigned int _uid;      /* sender's uid */
 145                 } _kill;
 146
 147                 /* POSIX.1b timers */
 148                 struct {
 149                         compat_timer_t _tid;    /* timer id */
 150                         int _overrun;           /* overrun count */
 151                         compat_sigval_t _sigval;        /* same as below */
 152                         int _sys_private;       /* not to be passed to user */
 153                         int _overrun_incr;      /* amount to add to overrun */
 154                 } _timer;
 155
 156                 /* POSIX.1b signals */
 157                 struct {
 158                         unsigned int _pid;      /* sender's pid */
 159                         unsigned int _uid;      /* sender's uid */
 160                         compat_sigval_t _sigval;
 161                 } _rt;
 162
 163                 /* SIGCHLD */
 164                 struct {
 165                         unsigned int _pid;      /* which child */
 166                         unsigned int _uid;      /* sender's uid */
 167                         int _status;            /* exit code */
 168                         compat_clock_t _utime;
 169                         compat_clock_t _stime;
 170                 } _sigchld;
 171
 172                 /* SIGCHLD (x32 version) */
 173                 struct {
 174                         unsigned int _pid;      /* which child */
 175                         unsigned int _uid;      /* sender's uid */
 176                         int _status;            /* exit code */
 177                         compat_s64 _utime;
 178                         compat_s64 _stime;
 179                 } _sigchld_x32;
 180
 181                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
 182                 struct {
 183                         unsigned int _addr;     /* faulting insn/memory ref. */
 184                 } _sigfault;
 185
 186                 /* SIGPOLL */
 187                 struct {
 188                         int _band;      /* POLL_IN, POLL_OUT, POLL_MSG */
 189                         int _fd;
 190                 } _sigpoll;
 191
 192                 struct {
 193                         unsigned int _call_addr; /* calling insn */
 194                         int _syscall;   /* triggering system call number */
 195                         unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
 196                 } _sigsys;
 197         } _sifields;
 198 } compat_siginfo_t;
 199
 200 #define COMPAT_OFF_T_MAX        0x7fffffff
 201 #define COMPAT_LOFF_T_MAX       0x7fffffffffffffffL
 202
 203 struct compat_ipc64_perm {
 204         compat_key_t key;
 205         __compat_uid32_t uid;
 206         __compat_gid32_t gid;
 207         __compat_uid32_t cuid;
 208         __compat_gid32_t cgid;
 209         unsigned short mode;
 210         unsigned short __pad1;
 211         unsigned short seq;
 212         unsigned short __pad2;
 213         compat_ulong_t unused1;
 214         compat_ulong_t unused2;
 215 };
 216
 217 struct compat_semid64_ds {
 218         struct compat_ipc64_perm sem_perm;
 219         compat_time_t  sem_otime;
 220         compat_ulong_t __unused1;
 221         compat_time_t  sem_ctime;
 222         compat_ulong_t __unused2;
 223         compat_ulong_t sem_nsems;
 224         compat_ulong_t __unused3;
 225         compat_ulong_t __unused4;
 226 };
 227
 228 struct compat_msqid64_ds {
 229         struct compat_ipc64_perm msg_perm;
 230         compat_time_t  msg_stime;
 231         compat_ulong_t __unused1;
 232         compat_time_t  msg_rtime;
 233         compat_ulong_t __unused2;
 234         compat_time_t  msg_ctime;
 235         compat_ulong_t __unused3;
 236         compat_ulong_t msg_cbytes;
 237         compat_ulong_t msg_qnum;
 238         compat_ulong_t msg_qbytes;
 239         compat_pid_t   msg_lspid;
 240         compat_pid_t   msg_lrpid;
 241         compat_ulong_t __unused4;
 242         compat_ulong_t __unused5;
 243 };
 244
 245 struct compat_shmid64_ds {
 246         struct compat_ipc64_perm shm_perm;
 247         compat_size_t  shm_segsz;
 248         compat_time_t  shm_atime;
 249         compat_ulong_t __unused1;
 250         compat_time_t  shm_dtime;
 251         compat_ulong_t __unused2;
 252         compat_time_t  shm_ctime;
 253         compat_ulong_t __unused3;
 254         compat_pid_t   shm_cpid;
 255         compat_pid_t   shm_lpid;
 256         compat_ulong_t shm_nattch;
 257         compat_ulong_t __unused4;
 258         compat_ulong_t __unused5;
 259 };
 260
 261 /*
 262  * The type of struct elf_prstatus.pr_reg in compatible core dumps.
 263  */
 264 #ifdef CONFIG_X86_X32_ABI
 265 typedef struct user_regs_struct compat_elf_gregset_t;
 266
 267 #define PR_REG_SIZE(S) (test_thread_flag(TIF_IA32) ? 68 : 216)
 268 #define PRSTATUS_SIZE(S) (test_thread_flag(TIF_IA32) ? 144 : 296)
 269 #define SET_PR_FPVALID(S,V) \
 270   do { *(int *) (((void *) &((S)->pr_reg)) + PR_REG_SIZE(0)) = (V); } \
 271   while (0)
 272
 273 #define COMPAT_USE_64BIT_TIME \
 274         (!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT))
 275 #else
 276 typedef struct user_regs_struct32 compat_elf_gregset_t;
 277 #endif
 278
 279 /*
 280  * A pointer passed in from user mode. This should not
 281  * be used for syscall parameters, just declare them
 282  * as pointers because the syscall entry code will have
 283  * appropriately converted them already.
 284  */
 285
 286 static inline void __user *compat_ptr(compat_uptr_t uptr)
 287 {
 288         return (void __user *)(unsigned long)uptr;
 289 }
 290
 291 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 292 {
 293         return (u32)(unsigned long)uptr;
 294 }
 295
 296 static inline void __user *arch_compat_alloc_user_space(long len)
 297 {
 298         compat_uptr_t sp;
 299
 300         if (test_thread_flag(TIF_IA32)) {
 301                 sp = task_pt_regs(current)->sp;
 302         } else {
 303                 /* -128 for the x32 ABI redzone */
 304                 sp = task_pt_regs(current)->sp - 128;
 305         }
 306
 307         return (void __user *)round_down(sp - len, 16);
 308 }
 309
 310 static inline bool is_x32_task(void)
 311 {
 312 #ifdef CONFIG_X86_X32_ABI
 313         if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
 314                 return true;
 315 #endif
 316         return false;
 317 }
 318
 319 static inline bool in_compat_syscall(void)
 320 {
 321         return is_ia32_task() || is_x32_task();
 322 }
 323 #define in_compat_syscall in_compat_syscall     /* override the generic impl */
 324
 325 #endif /* _ASM_X86_COMPAT_H */