arch/tile/kernel/compat.c

   1 /*
   2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 /* Adjust unistd.h to provide 32-bit numbers and functions. */
  16 #define __SYSCALL_COMPAT
  17
  18 #include <linux/compat.h>
  19 #include <linux/msg.h>
  20 #include <linux/syscalls.h>
  21 #include <linux/kdev_t.h>
  22 #include <linux/fs.h>
  23 #include <linux/fcntl.h>
  24 #include <linux/uaccess.h>
  25 #include <linux/signal.h>
  26 #include <asm/syscalls.h>
  27
  28 /*
  29  * Syscalls that take 64-bit numbers traditionally take them in 32-bit
  30  * "high" and "low" value parts on 32-bit architectures.
  31  * In principle, one could imagine passing some register arguments as
  32  * fully 64-bit on TILE-Gx in 32-bit mode, but it seems easier to
  33  * adapt the usual convention.
  34  */
  35
  36 long compat_sys_truncate64(char __user *filename, u32 dummy, u32 low, u32 high)
  37 {
  38         return sys_truncate(filename, ((loff_t)high << 32) | low);
  39 }
  40
  41 long compat_sys_ftruncate64(unsigned int fd, u32 dummy, u32 low, u32 high)
  42 {
  43         return sys_ftruncate(fd, ((loff_t)high << 32) | low);
  44 }
  45
  46 long compat_sys_pread64(unsigned int fd, char __user *ubuf, size_t count,
  47                         u32 dummy, u32 low, u32 high)
  48 {
  49         return sys_pread64(fd, ubuf, count, ((loff_t)high << 32) | low);
  50 }
  51
  52 long compat_sys_pwrite64(unsigned int fd, char __user *ubuf, size_t count,
  53                          u32 dummy, u32 low, u32 high)
  54 {
  55         return sys_pwrite64(fd, ubuf, count, ((loff_t)high << 32) | low);
  56 }
  57
  58 long compat_sys_lookup_dcookie(u32 low, u32 high, char __user *buf, size_t len)
  59 {
  60         return sys_lookup_dcookie(((loff_t)high << 32) | low, buf, len);
  61 }
  62
  63 long compat_sys_sync_file_range2(int fd, unsigned int flags,
  64                                  u32 offset_lo, u32 offset_hi,
  65                                  u32 nbytes_lo, u32 nbytes_hi)
  66 {
  67         return sys_sync_file_range(fd, ((loff_t)offset_hi << 32) | offset_lo,
  68                                    ((loff_t)nbytes_hi << 32) | nbytes_lo,
  69                                    flags);
  70 }
  71
  72 long compat_sys_fallocate(int fd, int mode,
  73                           u32 offset_lo, u32 offset_hi,
  74                           u32 len_lo, u32 len_hi)
  75 {
  76         return sys_fallocate(fd, mode, ((loff_t)offset_hi << 32) | offset_lo,
  77                              ((loff_t)len_hi << 32) | len_lo);
  78 }
  79
  80
  81
  82 long compat_sys_sched_rr_get_interval(compat_pid_t pid,
  83                                       struct compat_timespec __user *interval)
  84 {
  85         struct timespec t;
  86         int ret;
  87         mm_segment_t old_fs = get_fs();
  88
  89         set_fs(KERNEL_DS);
  90         ret = sys_sched_rr_get_interval(pid,
  91                                         (struct timespec __force __user *)&t);
  92         set_fs(old_fs);
  93         if (put_compat_timespec(&t, interval))
  94                 return -EFAULT;
  95         return ret;
  96 }
  97
  98 /*
  99  * The usual compat_sys_msgsnd() and _msgrcv() seem to be assuming
 100  * some different calling convention than our normal 32-bit tile code.
 101  */
 102
 103 /* Already defined in ipc/compat.c, but we need it here. */
 104 struct compat_msgbuf {
 105         compat_long_t mtype;
 106         char mtext[1];
 107 };
 108
 109 long tile_compat_sys_msgsnd(int msqid,
 110                             struct compat_msgbuf __user *msgp,
 111                             size_t msgsz, int msgflg)
 112 {
 113         compat_long_t mtype;
 114
 115         if (get_user(mtype, &msgp->mtype))
 116                 return -EFAULT;
 117         return do_msgsnd(msqid, mtype, msgp->mtext, msgsz, msgflg);
 118 }
 119
 120 long tile_compat_sys_msgrcv(int msqid,
 121                             struct compat_msgbuf __user *msgp,
 122                             size_t msgsz, long msgtyp, int msgflg)
 123 {
 124         long err, mtype;
 125
 126         err =  do_msgrcv(msqid, &mtype, msgp->mtext, msgsz, msgtyp, msgflg);
 127         if (err < 0)
 128                 goto out;
 129
 130         if (put_user(mtype, &msgp->mtype))
 131                 err = -EFAULT;
 132  out:
 133         return err;
 134 }
 135
 136 /* Provide the compat syscall number to call mapping. */
 137 #undef __SYSCALL
 138 #define __SYSCALL(nr, call) [nr] = (call),
 139
 140 /* The generic versions of these don't work for Tile. */
 141 #define compat_sys_msgrcv tile_compat_sys_msgrcv
 142 #define compat_sys_msgsnd tile_compat_sys_msgsnd
 143
 144 /* See comments in sys.c */
 145 #define compat_sys_fadvise64_64 sys32_fadvise64_64
 146 #define compat_sys_readahead sys32_readahead
 147
 148 /* Call the trampolines to manage pt_regs where necessary. */
 149 #define compat_sys_execve _compat_sys_execve
 150 #define compat_sys_sigaltstack _compat_sys_sigaltstack
 151 #define compat_sys_rt_sigreturn _compat_sys_rt_sigreturn
 152 #define sys_clone _sys_clone
 153
 154 /*
 155  * Note that we can't include <linux/unistd.h> here since the header
 156  * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
 157  */
 158 void *compat_sys_call_table[__NR_syscalls] = {
 159         [0 ... __NR_syscalls-1] = sys_ni_syscall,
 160 #include <asm/unistd.h>
 161 };