compat.h

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/*
 * Copyright 2010 Tilera Corporation. All Rights Reserved.
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation, version 2.
 *
 *   This program is distributed in the hope that it will be useful, but
 *   WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 *   NON INFRINGEMENT.  See the GNU General Public License for
 *   more details.
 */

#ifndef _ASM_TILE_COMPAT_H
#define _ASM_TILE_COMPAT_H

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

#define COMPAT_USER_HZ  100

/* "long" and pointer-based types are different. */
typedef s32     compat_long_t;
typedef u32     compat_ulong_t;
typedef u32     compat_size_t;
typedef s32     compat_ssize_t;
typedef s32     compat_off_t;
typedef s32     compat_time_t;
typedef s32     compat_clock_t;
typedef u32     compat_ino_t;
typedef u32     compat_caddr_t;
typedef u32     compat_uptr_t;

/* Many types are "int" or otherwise the same. */
typedef __kernel_pid_t compat_pid_t;
typedef __kernel_uid_t __compat_uid_t;
typedef __kernel_gid_t __compat_gid_t;
typedef __kernel_uid32_t __compat_uid32_t;
typedef __kernel_uid32_t __compat_gid32_t;
typedef __kernel_mode_t compat_mode_t;
typedef __kernel_dev_t compat_dev_t;
typedef __kernel_loff_t compat_loff_t;
typedef __kernel_ipc_pid_t compat_ipc_pid_t;
typedef __kernel_daddr_t compat_daddr_t;
typedef __kernel_fsid_t compat_fsid_t;
typedef __kernel_timer_t compat_timer_t;
typedef __kernel_key_t compat_key_t;
typedef int compat_int_t;
typedef s64 compat_s64;
typedef uint compat_uint_t;
typedef u64 compat_u64;

/* We use the same register dump format in 32-bit images. */
typedef unsigned long compat_elf_greg_t;
#define COMPAT_ELF_NGREG (sizeof(struct pt_regs) / sizeof(compat_elf_greg_t))
typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_ELF_NGREG];

struct compat_timespec {
    compat_time_t   tv_sec;
    s32     tv_nsec;
};

struct compat_timeval {
    compat_time_t   tv_sec;
    s32     tv_usec;
};

#define compat_stat stat
#define compat_statfs statfs

struct compat_sysctl {
    unsigned int    name;
    int     nlen;
    unsigned int    oldval;
    unsigned int    oldlenp;
    unsigned int    newval;
    unsigned int    newlen;
    unsigned int    __unused[4];
};


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

struct compat_flock64 {
    short       l_type;
    short       l_whence;
    compat_loff_t   l_start;
    compat_loff_t   l_len;
    compat_pid_t    l_pid;
};

#define COMPAT_RLIM_INFINITY        0xffffffff

#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;

#define COMPAT_SI_PAD_SIZE  (128/sizeof(int) - 3)

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

    union {
        int _pad[COMPAT_SI_PAD_SIZE];

        /* 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;

        /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
        struct {
            unsigned int _addr; /* faulting insn/memory ref. */
#ifdef __ARCH_SI_TRAPNO
            int _trapno;    /* TRAP # which caused the signal */
#endif
        } _sigfault;

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

/*
 * 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 *)(long)(s32)uptr;
}

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

/* Sign-extend when storing a kernel pointer to a user's ptregs. */
static inline unsigned long ptr_to_compat_reg(void __user *uptr)
{
    return (long)(int)(long __force)uptr;
}

static inline void __user *arch_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;
}

extern int compat_setup_rt_frame(int sig, struct k_sigaction *ka,
                 siginfo_t *info, sigset_t *set,
                 struct pt_regs *regs);

/* Compat syscalls. */
struct compat_sigaction;
struct compat_siginfo;
struct compat_sigaltstack;
long compat_sys_execve(const char __user *path,
               compat_uptr_t __user *argv,
               compat_uptr_t __user *envp, struct pt_regs *);
long compat_sys_rt_sigaction(int sig, struct compat_sigaction __user *act,
                 struct compat_sigaction __user *oact,
                 size_t sigsetsize);
long compat_sys_rt_sigqueueinfo(int pid, int sig,
                struct compat_siginfo __user *uinfo);
long compat_sys_rt_sigreturn(struct pt_regs *);
long compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr,
                struct compat_sigaltstack __user *uoss_ptr,
                struct pt_regs *);
long compat_sys_truncate64(char __user *filename, u32 dummy, u32 low, u32 high);
long compat_sys_ftruncate64(unsigned int fd, u32 dummy, u32 low, u32 high);
long compat_sys_pread64(unsigned int fd, char __user *ubuf, size_t count,
            u32 dummy, u32 low, u32 high);
long compat_sys_pwrite64(unsigned int fd, char __user *ubuf, size_t count,
             u32 dummy, u32 low, u32 high);
long compat_sys_lookup_dcookie(u32 low, u32 high, char __user *buf, size_t len);
long compat_sys_sync_file_range2(int fd, unsigned int flags,
                 u32 offset_lo, u32 offset_hi,
                 u32 nbytes_lo, u32 nbytes_hi);
long compat_sys_fallocate(int fd, int mode,
              u32 offset_lo, u32 offset_hi,
              u32 len_lo, u32 len_hi);
long compat_sys_sched_rr_get_interval(compat_pid_t pid,
                      struct compat_timespec __user *interval);

/* These are the intvec_64.S trampolines. */
long _compat_sys_execve(const char __user *path,
            const compat_uptr_t __user *argv,
            const compat_uptr_t __user *envp);
long _compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr,
                struct compat_sigaltstack __user *uoss_ptr);
long _compat_sys_rt_sigreturn(void);

#endif /* _ASM_TILE_COMPAT_H */