root/include/asm-x86/compat.h

INCLUDED FROM

DEFINITIONS

1. compat_ptr
2. ptr_to_compat
3. compat_alloc_user_space
4. is_compat_task

#ifndef ASM_X86__COMPAT_H
#define ASM_X86__COMPAT_H

/*
 * Architecture specific compatibility types
 */
#include <linux/types.h>
#include <linux/sched.h>
#include <asm/user32.h>

#define COMPAT_USER_HZ  100

typedef u32             compat_size_t;
typedef s32             compat_ssize_t;
typedef s32             compat_time_t;
typedef s32             compat_clock_t;
typedef s32             compat_pid_t;
typedef u16             __compat_uid_t;
typedef u16             __compat_gid_t;
typedef u32             __compat_uid32_t;
typedef u32             __compat_gid32_t;
typedef u16             compat_mode_t;
typedef u32             compat_ino_t;
typedef u16             compat_dev_t;
typedef s32             compat_off_t;
typedef s64             compat_loff_t;
typedef u16             compat_nlink_t;
typedef u16             compat_ipc_pid_t;
typedef s32             compat_daddr_t;
typedef u32             compat_caddr_t;
typedef __kernel_fsid_t compat_fsid_t;
typedef s32             compat_timer_t;
typedef s32             compat_key_t;

typedef s32             compat_int_t;
typedef s32             compat_long_t;
typedef s64 __attribute__((aligned(4))) compat_s64;
typedef u32             compat_uint_t;
typedef u32             compat_ulong_t;
typedef u64 __attribute__((aligned(4))) compat_u64;

struct compat_timespec {
        compat_time_t   tv_sec;
        s32             tv_nsec;
};

struct compat_timeval {
        compat_time_t   tv_sec;
        s32             tv_usec;
};

struct compat_stat {
        compat_dev_t    st_dev;
        u16             __pad1;
        compat_ino_t    st_ino;
        compat_mode_t   st_mode;
        compat_nlink_t  st_nlink;
        __compat_uid_t  st_uid;
        __compat_gid_t  st_gid;
        compat_dev_t    st_rdev;
        u16             __pad2;
        u32             st_size;
        u32             st_blksize;
        u32             st_blocks;
        u32             st_atime;
        u32             st_atime_nsec;
        u32             st_mtime;
        u32             st_mtime_nsec;
        u32             st_ctime;
        u32             st_ctime_nsec;
        u32             __unused4;
        u32             __unused5;
};

struct compat_flock {
        short           l_type;
        short           l_whence;
        compat_off_t    l_start;
        compat_off_t    l_len;
        compat_pid_t    l_pid;
};

#define F_GETLK64       12      /*  using 'struct flock64' */
#define F_SETLK64       13
#define F_SETLKW64      14

/*
 * IA32 uses 4 byte alignment for 64 bit quantities,
 * so we need to pack this structure.
 */
struct compat_flock64 {
        short           l_type;
        short           l_whence;
        compat_loff_t   l_start;
        compat_loff_t   l_len;
        compat_pid_t    l_pid;
} __attribute__((packed));

struct compat_statfs {
        int             f_type;
        int             f_bsize;
        int             f_blocks;
        int             f_bfree;
        int             f_bavail;
        int             f_files;
        int             f_ffree;
        compat_fsid_t   f_fsid;
        int             f_namelen;      /* SunOS ignores this field. */
        int             f_frsize;
        int             f_spare[5];
};

#define COMPAT_RLIM_OLD_INFINITY        0x7fffffff
#define COMPAT_RLIM_INFINITY            0xffffffff

typedef u32             compat_old_sigset_t;    /* at least 32 bits */

#define _COMPAT_NSIG            64
#define _COMPAT_NSIG_BPW        32

typedef u32               compat_sigset_word;

#define COMPAT_OFF_T_MAX        0x7fffffff
#define COMPAT_LOFF_T_MAX       0x7fffffffffffffffL

struct compat_ipc64_perm {
        compat_key_t key;
        __compat_uid32_t uid;
        __compat_gid32_t gid;
        __compat_uid32_t cuid;
        __compat_gid32_t cgid;
        unsigned short mode;
        unsigned short __pad1;
        unsigned short seq;
        unsigned short __pad2;
        compat_ulong_t unused1;
        compat_ulong_t unused2;
};

struct compat_semid64_ds {
        struct compat_ipc64_perm sem_perm;
        compat_time_t  sem_otime;
        compat_ulong_t __unused1;
        compat_time_t  sem_ctime;
        compat_ulong_t __unused2;
        compat_ulong_t sem_nsems;
        compat_ulong_t __unused3;
        compat_ulong_t __unused4;
};

struct compat_msqid64_ds {
        struct compat_ipc64_perm msg_perm;
        compat_time_t  msg_stime;
        compat_ulong_t __unused1;
        compat_time_t  msg_rtime;
        compat_ulong_t __unused2;
        compat_time_t  msg_ctime;
        compat_ulong_t __unused3;
        compat_ulong_t msg_cbytes;
        compat_ulong_t msg_qnum;
        compat_ulong_t msg_qbytes;
        compat_pid_t   msg_lspid;
        compat_pid_t   msg_lrpid;
        compat_ulong_t __unused4;
        compat_ulong_t __unused5;
};

struct compat_shmid64_ds {
        struct compat_ipc64_perm shm_perm;
        compat_size_t  shm_segsz;
        compat_time_t  shm_atime;
        compat_ulong_t __unused1;
        compat_time_t  shm_dtime;
        compat_ulong_t __unused2;
        compat_time_t  shm_ctime;
        compat_ulong_t __unused3;
        compat_pid_t   shm_cpid;
        compat_pid_t   shm_lpid;
        compat_ulong_t shm_nattch;
        compat_ulong_t __unused4;
        compat_ulong_t __unused5;
};

/*
 * The type of struct elf_prstatus.pr_reg in compatible core dumps.
 */
typedef struct user_regs_struct32 compat_elf_gregset_t;

/*
 * A pointer passed in from user mode. This should not
 * be used for syscall parameters, just declare them
 * as pointers because the syscall entry code will have
 * appropriately converted them already.
 */
typedef u32             compat_uptr_t;

static inline void __user *compat_ptr(compat_uptr_t uptr)
{
        return (void __user *)(unsigned long)uptr;
}

static inline compat_uptr_t ptr_to_compat(void __user *uptr)
{
        return (u32)(unsigned long)uptr;
}

static inline void __user *compat_alloc_user_space(long len)
{
        struct pt_regs *regs = task_pt_regs(current);
        return (void __user *)regs->sp - len;
}

static inline int is_compat_task(void)
{
        return current_thread_info()->status & TS_COMPAT;
}

#endif /* ASM_X86__COMPAT_H */