arch/h8300/kernel/sys_h8300.c

   1 /*
   2  * linux/arch/h8300/kernel/sys_h8300.c
   3  *
   4  * This file contains various random system calls that
   5  * have a non-standard calling sequence on the H8/300
   6  * platform.
   7  */
   8
   9 #include <linux/errno.h>
  10 #include <linux/sched.h>
  11 #include <linux/mm.h>
  12 #include <linux/smp.h>
  13 #include <linux/sem.h>
  14 #include <linux/msg.h>
  15 #include <linux/shm.h>
  16 #include <linux/stat.h>
  17 #include <linux/syscalls.h>
  18 #include <linux/mman.h>
  19 #include <linux/file.h>
  20 #include <linux/fs.h>
  21 #include <linux/ipc.h>
  22
  23 #include <asm/setup.h>
  24 #include <asm/uaccess.h>
  25 #include <asm/cachectl.h>
  26 #include <asm/traps.h>
  27 #include <asm/unistd.h>
  28
  29 /*
  30  * Perform the select(nd, in, out, ex, tv) and mmap() system
  31  * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
  32  * handle more than 4 system call parameters, so these system calls
  33  * used a memory block for parameter passing..
  34  */
  35
  36 struct mmap_arg_struct {
  37         unsigned long addr;
  38         unsigned long len;
  39         unsigned long prot;
  40         unsigned long flags;
  41         unsigned long fd;
  42         unsigned long offset;
  43 };
  44
  45 asmlinkage int old_mmap(struct mmap_arg_struct *arg)
  46 {
  47         struct mmap_arg_struct a;
  48         int error = -EFAULT;
  49
  50         if (copy_from_user(&a, arg, sizeof(a)))
  51                 goto out;
  52
  53         error = -EINVAL;
  54         if (a.offset & ~PAGE_MASK)
  55                 goto out;
  56
  57         error = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
  58                                a.offset >> PAGE_SHIFT);
  59 out:
  60         return error;
  61 }
  62
  63 struct sel_arg_struct {
  64         unsigned long n;
  65         fd_set *inp, *outp, *exp;
  66         struct timeval *tvp;
  67 };
  68
  69 asmlinkage int old_select(struct sel_arg_struct *arg)
  70 {
  71         struct sel_arg_struct a;
  72
  73         if (copy_from_user(&a, arg, sizeof(a)))
  74                 return -EFAULT;
  75         /* sys_select() does the appropriate kernel locking */
  76         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
  77 }
  78
  79 /*
  80  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  81  *
  82  * This is really horribly ugly.
  83  */
  84 asmlinkage int sys_ipc (uint call, int first, int second,
  85                         int third, void *ptr, long fifth)
  86 {
  87         int version, ret;
  88
  89         version = call >> 16; /* hack for backward compatibility */
  90         call &= 0xffff;
  91
  92         if (call <= SEMCTL)
  93                 switch (call) {
  94                 case SEMOP:
  95                         return sys_semop (first, (struct sembuf *)ptr, second);
  96                 case SEMGET:
  97                         return sys_semget (first, second, third);
  98                 case SEMCTL: {
  99                         union semun fourth;
 100                         if (!ptr)
 101                                 return -EINVAL;
 102                         if (get_user(fourth.__pad, (void **) ptr))
 103                                 return -EFAULT;
 104                         return sys_semctl (first, second, third, fourth);
 105                         }
 106                 default:
 107                         return -EINVAL;
 108                 }
 109         if (call <= MSGCTL)
 110                 switch (call) {
 111                 case MSGSND:
 112                         return sys_msgsnd (first, (struct msgbuf *) ptr,
 113                                           second, third);
 114                 case MSGRCV:
 115                         switch (version) {
 116                         case 0: {
 117                                 struct ipc_kludge tmp;
 118                                 if (!ptr)
 119                                         return -EINVAL;
 120                                 if (copy_from_user (&tmp,
 121                                                     (struct ipc_kludge *)ptr,
 122                                                     sizeof (tmp)))
 123                                         return -EFAULT;
 124                                 return sys_msgrcv (first, tmp.msgp, second,
 125                                                    tmp.msgtyp, third);
 126                                 }
 127                         default:
 128                                 return sys_msgrcv (first,
 129                                                    (struct msgbuf *) ptr,
 130                                                    second, fifth, third);
 131                         }
 132                 case MSGGET:
 133                         return sys_msgget ((key_t) first, second);
 134                 case MSGCTL:
 135                         return sys_msgctl (first, second,
 136                                            (struct msqid_ds *) ptr);
 137                 default:
 138                         return -EINVAL;
 139                 }
 140         if (call <= SHMCTL)
 141                 switch (call) {
 142                 case SHMAT:
 143                         switch (version) {
 144                         default: {
 145                                 ulong raddr;
 146                                 ret = do_shmat (first, (char *) ptr,
 147                                                  second, &raddr);
 148                                 if (ret)
 149                                         return ret;
 150                                 return put_user (raddr, (ulong *) third);
 151                         }
 152                         }
 153                 case SHMDT:
 154                         return sys_shmdt ((char *)ptr);
 155                 case SHMGET:
 156                         return sys_shmget (first, second, third);
 157                 case SHMCTL:
 158                         return sys_shmctl (first, second,
 159                                            (struct shmid_ds *) ptr);
 160                 default:
 161                         return -EINVAL;
 162                 }
 163
 164         return -EINVAL;
 165 }
 166
 167 /* sys_cacheflush -- no support.  */
 168 asmlinkage int
 169 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
 170 {
 171         return -EINVAL;
 172 }
 173
 174 asmlinkage int sys_getpagesize(void)
 175 {
 176         return PAGE_SIZE;
 177 }
 178
 179 #if defined(CONFIG_SYSCALL_PRINT)
 180 asmlinkage void syscall_print(void *dummy,...)
 181 {
 182         struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
 183         printk("call %06lx:%ld 1:%08lx,2:%08lx,3:%08lx,ret:%08lx\n",
 184                ((regs->pc)&0xffffff)-2,regs->orig_er0,regs->er1,regs->er2,regs->er3,regs->er0);
 185 }
 186 #endif
 187
 188 /*
 189  * Do a system call from kernel instead of calling sys_execve so we
 190  * end up with proper pt_regs.
 191  */
 192 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 193 {
 194         register long res __asm__("er0");
 195         register char *const *_c __asm__("er3") = envp;
 196         register char *const *_b __asm__("er2") = argv;
 197         register const char * _a __asm__("er1") = filename;
 198         __asm__ __volatile__ ("mov.l %1,er0\n\t"
 199                         "trapa  #0\n\t"
 200                         : "=r" (res)
 201                         : "g" (__NR_execve),
 202                           "g" (_a),
 203                           "g" (_b),
 204                           "g" (_c)
 205                         : "cc", "memory");
 206         return res;
 207 }
 208
 209