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 /*
  64  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  65  *
  66  * This is really horribly ugly.
  67  */
  68 asmlinkage int sys_ipc (uint call, int first, int second,
  69                         int third, void *ptr, long fifth)
  70 {
  71         int version, ret;
  72
  73         version = call >> 16; /* hack for backward compatibility */
  74         call &= 0xffff;
  75
  76         if (call <= SEMCTL)
  77                 switch (call) {
  78                 case SEMOP:
  79                         return sys_semop (first, (struct sembuf *)ptr, second);
  80                 case SEMGET:
  81                         return sys_semget (first, second, third);
  82                 case SEMCTL: {
  83                         union semun fourth;
  84                         if (!ptr)
  85                                 return -EINVAL;
  86                         if (get_user(fourth.__pad, (void **) ptr))
  87                                 return -EFAULT;
  88                         return sys_semctl (first, second, third, fourth);
  89                         }
  90                 default:
  91                         return -EINVAL;
  92                 }
  93         if (call <= MSGCTL)
  94                 switch (call) {
  95                 case MSGSND:
  96                         return sys_msgsnd (first, (struct msgbuf *) ptr,
  97                                           second, third);
  98                 case MSGRCV:
  99                         switch (version) {
 100                         case 0: {
 101                                 struct ipc_kludge tmp;
 102                                 if (!ptr)
 103                                         return -EINVAL;
 104                                 if (copy_from_user (&tmp,
 105                                                     (struct ipc_kludge *)ptr,
 106                                                     sizeof (tmp)))
 107                                         return -EFAULT;
 108                                 return sys_msgrcv (first, tmp.msgp, second,
 109                                                    tmp.msgtyp, third);
 110                                 }
 111                         default:
 112                                 return sys_msgrcv (first,
 113                                                    (struct msgbuf *) ptr,
 114                                                    second, fifth, third);
 115                         }
 116                 case MSGGET:
 117                         return sys_msgget ((key_t) first, second);
 118                 case MSGCTL:
 119                         return sys_msgctl (first, second,
 120                                            (struct msqid_ds *) ptr);
 121                 default:
 122                         return -EINVAL;
 123                 }
 124         if (call <= SHMCTL)
 125                 switch (call) {
 126                 case SHMAT:
 127                         switch (version) {
 128                         default: {
 129                                 ulong raddr;
 130                                 ret = do_shmat (first, (char *) ptr,
 131                                                  second, &raddr);
 132                                 if (ret)
 133                                         return ret;
 134                                 return put_user (raddr, (ulong *) third);
 135                         }
 136                         }
 137                 case SHMDT:
 138                         return sys_shmdt ((char *)ptr);
 139                 case SHMGET:
 140                         return sys_shmget (first, second, third);
 141                 case SHMCTL:
 142                         return sys_shmctl (first, second,
 143                                            (struct shmid_ds *) ptr);
 144                 default:
 145                         return -EINVAL;
 146                 }
 147
 148         return -EINVAL;
 149 }
 150
 151 /* sys_cacheflush -- no support.  */
 152 asmlinkage int
 153 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
 154 {
 155         return -EINVAL;
 156 }
 157
 158 asmlinkage int sys_getpagesize(void)
 159 {
 160         return PAGE_SIZE;
 161 }
 162
 163 #if defined(CONFIG_SYSCALL_PRINT)
 164 asmlinkage void syscall_print(void *dummy,...)
 165 {
 166         struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
 167         printk("call %06lx:%ld 1:%08lx,2:%08lx,3:%08lx,ret:%08lx\n",
 168                ((regs->pc)&0xffffff)-2,regs->orig_er0,regs->er1,regs->er2,regs->er3,regs->er0);
 169 }
 170 #endif
 171
 172 /*
 173  * Do a system call from kernel instead of calling sys_execve so we
 174  * end up with proper pt_regs.
 175  */
 176 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 177 {
 178         register long res __asm__("er0");
 179         register char *const *_c __asm__("er3") = envp;
 180         register char *const *_b __asm__("er2") = argv;
 181         register const char * _a __asm__("er1") = filename;
 182         __asm__ __volatile__ ("mov.l %1,er0\n\t"
 183                         "trapa  #0\n\t"
 184                         : "=r" (res)
 185                         : "g" (__NR_execve),
 186                           "g" (_a),
 187                           "g" (_b),
 188                           "g" (_c)
 189                         : "cc", "memory");
 190         return res;
 191 }
 192
 193