compat.h

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#ifndef _ASM_X86_COMPAT_H
#define _ASM_X86_COMPAT_H

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

#define COMPAT_USER_HZ      100
#define COMPAT_UTS_MACHINE  "i686\0\0"

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;
typedef u32     compat_uptr_t;

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_flags;
    int     f_spare[4];
};

#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;

typedef union compat_sigval {
    compat_int_t    sival_int;
    compat_uptr_t   sival_ptr;
} compat_sigval_t;

typedef struct compat_siginfo {
    int si_signo;
    int si_errno;
    int si_code;

    union {
        int _pad[128/sizeof(int) - 3];

        /* kill() */
        struct {
            unsigned int _pid;  /* sender's pid */
            unsigned int _uid;  /* sender's uid */
        } _kill;

        /* POSIX.1b timers */
        struct {
            compat_timer_t _tid;    /* timer id */
            int _overrun;       /* overrun count */
            compat_sigval_t _sigval;    /* same as below */
            int _sys_private;   /* not to be passed to user */
            int _overrun_incr;  /* amount to add to overrun */
        } _timer;

        /* POSIX.1b signals */
        struct {
            unsigned int _pid;  /* sender's pid */
            unsigned int _uid;  /* sender's uid */
            compat_sigval_t _sigval;
        } _rt;

        /* SIGCHLD */
        struct {
            unsigned int _pid;  /* which child */
            unsigned int _uid;  /* sender's uid */
            int _status;        /* exit code */
            compat_clock_t _utime;
            compat_clock_t _stime;
        } _sigchld;

        /* SIGCHLD (x32 version) */
        struct {
            unsigned int _pid;  /* which child */
            unsigned int _uid;  /* sender's uid */
            int _status;        /* exit code */
            compat_s64 _utime;
            compat_s64 _stime;
        } _sigchld_x32;

        /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
        struct {
            unsigned int _addr; /* faulting insn/memory ref. */
        } _sigfault;

        /* SIGPOLL */
        struct {
            int _band;  /* POLL_IN, POLL_OUT, POLL_MSG */
            int _fd;
        } _sigpoll;

        struct {
            unsigned int _call_addr; /* calling insn */
            int _syscall;   /* triggering system call number */
            unsigned int _arch; /* AUDIT_ARCH_* of syscall */
        } _sigsys;
    } _sifields;
} compat_siginfo_t;

#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.
 */
#ifdef CONFIG_X86_X32_ABI
typedef struct user_regs_struct compat_elf_gregset_t;

#define PR_REG_SIZE(S) (test_thread_flag(TIF_IA32) ? 68 : 216)
#define PRSTATUS_SIZE(S) (test_thread_flag(TIF_IA32) ? 144 : 296)
#define SET_PR_FPVALID(S,V) \
  do { *(int *) (((void *) &((S)->pr_reg)) + PR_REG_SIZE(0)) = (V); } \
  while (0)

#define COMPAT_USE_64BIT_TIME \
    (!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT))
#else
typedef struct user_regs_struct32 compat_elf_gregset_t;
#endif

/*
 * 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.
 */

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 *arch_compat_alloc_user_space(long len)
{
    compat_uptr_t sp;

    if (test_thread_flag(TIF_IA32)) {
        sp = task_pt_regs(current)->sp;
    } else {
        /* -128 for the x32 ABI redzone */
        sp = this_cpu_read(old_rsp) - 128;
    }

    return (void __user *)round_down(sp - len, 16);
}

static inline bool is_x32_task(void)
{
#ifdef CONFIG_X86_X32_ABI
    if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
        return true;
#endif
    return false;
}

static inline bool is_compat_task(void)
{
    return is_ia32_task() || is_x32_task();
}

#endif /* _ASM_X86_COMPAT_H */