linux/arch/x86/include/asm/compat.h
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   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
  16typedef u32             compat_size_t;
  17typedef s32             compat_ssize_t;
  18typedef s32             compat_time_t;
  19typedef s32             compat_clock_t;
  20typedef s32             compat_pid_t;
  21typedef u16             __compat_uid_t;
  22typedef u16             __compat_gid_t;
  23typedef u32             __compat_uid32_t;
  24typedef u32             __compat_gid32_t;
  25typedef u16             compat_mode_t;
  26typedef u32             compat_ino_t;
  27typedef u16             compat_dev_t;
  28typedef s32             compat_off_t;
  29typedef s64             compat_loff_t;
  30typedef u16             compat_nlink_t;
  31typedef u16             compat_ipc_pid_t;
  32typedef s32             compat_daddr_t;
  33typedef u32             compat_caddr_t;
  34typedef __kernel_fsid_t compat_fsid_t;
  35typedef s32             compat_timer_t;
  36typedef s32             compat_key_t;
  37
  38typedef s32             compat_int_t;
  39typedef s32             compat_long_t;
  40typedef s64 __attribute__((aligned(4))) compat_s64;
  41typedef u32             compat_uint_t;
  42typedef u32             compat_ulong_t;
  43typedef u32             compat_u32;
  44typedef u64 __attribute__((aligned(4))) compat_u64;
  45typedef u32             compat_uptr_t;
  46
  47struct compat_timespec {
  48        compat_time_t   tv_sec;
  49        s32             tv_nsec;
  50};
  51
  52struct compat_timeval {
  53        compat_time_t   tv_sec;
  54        s32             tv_usec;
  55};
  56
  57struct compat_stat {
  58        compat_dev_t    st_dev;
  59        u16             __pad1;
  60        compat_ino_t    st_ino;
  61        compat_mode_t   st_mode;
  62        compat_nlink_t  st_nlink;
  63        __compat_uid_t  st_uid;
  64        __compat_gid_t  st_gid;
  65        compat_dev_t    st_rdev;
  66        u16             __pad2;
  67        u32             st_size;
  68        u32             st_blksize;
  69        u32             st_blocks;
  70        u32             st_atime;
  71        u32             st_atime_nsec;
  72        u32             st_mtime;
  73        u32             st_mtime_nsec;
  74        u32             st_ctime;
  75        u32             st_ctime_nsec;
  76        u32             __unused4;
  77        u32             __unused5;
  78};
  79
  80struct compat_flock {
  81        short           l_type;
  82        short           l_whence;
  83        compat_off_t    l_start;
  84        compat_off_t    l_len;
  85        compat_pid_t    l_pid;
  86};
  87
  88#define F_GETLK64       12      /*  using 'struct flock64' */
  89#define F_SETLK64       13
  90#define F_SETLKW64      14
  91
  92/*
  93 * IA32 uses 4 byte alignment for 64 bit quantities,
  94 * so we need to pack this structure.
  95 */
  96struct compat_flock64 {
  97        short           l_type;
  98        short           l_whence;
  99        compat_loff_t   l_start;
 100        compat_loff_t   l_len;
 101        compat_pid_t    l_pid;
 102} __attribute__((packed));
 103
 104struct compat_statfs {
 105        int             f_type;
 106        int             f_bsize;
 107        int             f_blocks;
 108        int             f_bfree;
 109        int             f_bavail;
 110        int             f_files;
 111        int             f_ffree;
 112        compat_fsid_t   f_fsid;
 113        int             f_namelen;      /* SunOS ignores this field. */
 114        int             f_frsize;
 115        int             f_flags;
 116        int             f_spare[4];
 117};
 118
 119#define COMPAT_RLIM_OLD_INFINITY        0x7fffffff
 120#define COMPAT_RLIM_INFINITY            0xffffffff
 121
 122typedef u32             compat_old_sigset_t;    /* at least 32 bits */
 123
 124#define _COMPAT_NSIG            64
 125#define _COMPAT_NSIG_BPW        32
 126
 127typedef u32               compat_sigset_word;
 128
 129typedef union compat_sigval {
 130        compat_int_t    sival_int;
 131        compat_uptr_t   sival_ptr;
 132} compat_sigval_t;
 133
 134typedef struct compat_siginfo {
 135        int si_signo;
 136        int si_errno;
 137        int si_code;
 138
 139        union {
 140                int _pad[128/sizeof(int) - 3];
 141
 142                /* kill() */
 143                struct {
 144                        unsigned int _pid;      /* sender's pid */
 145                        unsigned int _uid;      /* sender's uid */
 146                } _kill;
 147
 148                /* POSIX.1b timers */
 149                struct {
 150                        compat_timer_t _tid;    /* timer id */
 151                        int _overrun;           /* overrun count */
 152                        compat_sigval_t _sigval;        /* same as below */
 153                        int _sys_private;       /* not to be passed to user */
 154                        int _overrun_incr;      /* amount to add to overrun */
 155                } _timer;
 156
 157                /* POSIX.1b signals */
 158                struct {
 159                        unsigned int _pid;      /* sender's pid */
 160                        unsigned int _uid;      /* sender's uid */
 161                        compat_sigval_t _sigval;
 162                } _rt;
 163
 164                /* SIGCHLD */
 165                struct {
 166                        unsigned int _pid;      /* which child */
 167                        unsigned int _uid;      /* sender's uid */
 168                        int _status;            /* exit code */
 169                        compat_clock_t _utime;
 170                        compat_clock_t _stime;
 171                } _sigchld;
 172
 173                /* SIGCHLD (x32 version) */
 174                struct {
 175                        unsigned int _pid;      /* which child */
 176                        unsigned int _uid;      /* sender's uid */
 177                        int _status;            /* exit code */
 178                        compat_s64 _utime;
 179                        compat_s64 _stime;
 180                } _sigchld_x32;
 181
 182                /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
 183                struct {
 184                        unsigned int _addr;     /* faulting insn/memory ref. */
 185                        short int _addr_lsb;    /* Valid LSB of the reported address. */
 186                        union {
 187                                /* used when si_code=SEGV_BNDERR */
 188                                struct {
 189                                        compat_uptr_t _lower;
 190                                        compat_uptr_t _upper;
 191                                } _addr_bnd;
 192                                /* used when si_code=SEGV_PKUERR */
 193                                compat_u32 _pkey;
 194                        };
 195                } _sigfault;
 196
 197                /* SIGPOLL */
 198                struct {
 199                        int _band;      /* POLL_IN, POLL_OUT, POLL_MSG */
 200                        int _fd;
 201                } _sigpoll;
 202
 203                struct {
 204                        unsigned int _call_addr; /* calling insn */
 205                        int _syscall;   /* triggering system call number */
 206                        unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
 207                } _sigsys;
 208        } _sifields;
 209} compat_siginfo_t;
 210
 211#define COMPAT_OFF_T_MAX        0x7fffffff
 212#define COMPAT_LOFF_T_MAX       0x7fffffffffffffffL
 213
 214struct compat_ipc64_perm {
 215        compat_key_t key;
 216        __compat_uid32_t uid;
 217        __compat_gid32_t gid;
 218        __compat_uid32_t cuid;
 219        __compat_gid32_t cgid;
 220        unsigned short mode;
 221        unsigned short __pad1;
 222        unsigned short seq;
 223        unsigned short __pad2;
 224        compat_ulong_t unused1;
 225        compat_ulong_t unused2;
 226};
 227
 228struct compat_semid64_ds {
 229        struct compat_ipc64_perm sem_perm;
 230        compat_time_t  sem_otime;
 231        compat_ulong_t __unused1;
 232        compat_time_t  sem_ctime;
 233        compat_ulong_t __unused2;
 234        compat_ulong_t sem_nsems;
 235        compat_ulong_t __unused3;
 236        compat_ulong_t __unused4;
 237};
 238
 239struct compat_msqid64_ds {
 240        struct compat_ipc64_perm msg_perm;
 241        compat_time_t  msg_stime;
 242        compat_ulong_t __unused1;
 243        compat_time_t  msg_rtime;
 244        compat_ulong_t __unused2;
 245        compat_time_t  msg_ctime;
 246        compat_ulong_t __unused3;
 247        compat_ulong_t msg_cbytes;
 248        compat_ulong_t msg_qnum;
 249        compat_ulong_t msg_qbytes;
 250        compat_pid_t   msg_lspid;
 251        compat_pid_t   msg_lrpid;
 252        compat_ulong_t __unused4;
 253        compat_ulong_t __unused5;
 254};
 255
 256struct compat_shmid64_ds {
 257        struct compat_ipc64_perm shm_perm;
 258        compat_size_t  shm_segsz;
 259        compat_time_t  shm_atime;
 260        compat_ulong_t __unused1;
 261        compat_time_t  shm_dtime;
 262        compat_ulong_t __unused2;
 263        compat_time_t  shm_ctime;
 264        compat_ulong_t __unused3;
 265        compat_pid_t   shm_cpid;
 266        compat_pid_t   shm_lpid;
 267        compat_ulong_t shm_nattch;
 268        compat_ulong_t __unused4;
 269        compat_ulong_t __unused5;
 270};
 271
 272/*
 273 * The type of struct elf_prstatus.pr_reg in compatible core dumps.
 274 */
 275#ifdef CONFIG_X86_X32_ABI
 276typedef struct user_regs_struct compat_elf_gregset_t;
 277
 278#define PR_REG_SIZE(S) (test_thread_flag(TIF_IA32) ? 68 : 216)
 279#define PRSTATUS_SIZE(S) (test_thread_flag(TIF_IA32) ? 144 : 296)
 280#define SET_PR_FPVALID(S,V) \
 281  do { *(int *) (((void *) &((S)->pr_reg)) + PR_REG_SIZE(0)) = (V); } \
 282  while (0)
 283
 284#define COMPAT_USE_64BIT_TIME \
 285        (!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT))
 286#else
 287typedef struct user_regs_struct32 compat_elf_gregset_t;
 288#endif
 289
 290/*
 291 * A pointer passed in from user mode. This should not
 292 * be used for syscall parameters, just declare them
 293 * as pointers because the syscall entry code will have
 294 * appropriately converted them already.
 295 */
 296
 297static inline void __user *compat_ptr(compat_uptr_t uptr)
 298{
 299        return (void __user *)(unsigned long)uptr;
 300}
 301
 302static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 303{
 304        return (u32)(unsigned long)uptr;
 305}
 306
 307static inline void __user *arch_compat_alloc_user_space(long len)
 308{
 309        compat_uptr_t sp;
 310
 311        if (test_thread_flag(TIF_IA32)) {
 312                sp = task_pt_regs(current)->sp;
 313        } else {
 314                /* -128 for the x32 ABI redzone */
 315                sp = task_pt_regs(current)->sp - 128;
 316        }
 317
 318        return (void __user *)round_down(sp - len, 16);
 319}
 320
 321static inline bool in_x32_syscall(void)
 322{
 323#ifdef CONFIG_X86_X32_ABI
 324        if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
 325                return true;
 326#endif
 327        return false;
 328}
 329
 330static inline bool in_compat_syscall(void)
 331{
 332        return in_ia32_syscall() || in_x32_syscall();
 333}
 334#define in_compat_syscall in_compat_syscall     /* override the generic impl */
 335
 336#endif /* _ASM_X86_COMPAT_H */
 337
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