arch/x86/include/asm/compat.h

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This source file includes following definitions.
compat_ptr
ptr_to_compat
arch_compat_alloc_user_space
is_x32_task
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/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 */
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root/arch/x86/include/asm/compat.h

INCLUDED FROM

DEFINITIONS
