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   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  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  31  *
  32  * This is really horribly ugly.
  33  */
  34 asmlinkage int sys_ipc (uint call, int first, int second,
  35                         int third, void *ptr, long fifth)
  36 {
  37         int version, ret;
  38
  39         version = call >> 16; /* hack for backward compatibility */
  40         call &= 0xffff;
  41
  42         if (call <= SEMCTL)
  43                 switch (call) {
  44                 case SEMOP:
  45                         return sys_semop (first, (struct sembuf *)ptr, second);
  46                 case SEMGET:
  47                         return sys_semget (first, second, third);
  48                 case SEMCTL: {
  49                         union semun fourth;
  50                         if (!ptr)
  51                                 return -EINVAL;
  52                         if (get_user(fourth.__pad, (void **) ptr))
  53                                 return -EFAULT;
  54                         return sys_semctl (first, second, third, fourth);
  55                         }
  56                 default:
  57                         return -EINVAL;
  58                 }
  59         if (call <= MSGCTL)
  60                 switch (call) {
  61                 case MSGSND:
  62                         return sys_msgsnd (first, (struct msgbuf *) ptr,
  63                                           second, third);
  64                 case MSGRCV:
  65                         switch (version) {
  66                         case 0: {
  67                                 struct ipc_kludge tmp;
  68                                 if (!ptr)
  69                                         return -EINVAL;
  70                                 if (copy_from_user (&tmp,
  71                                                     (struct ipc_kludge *)ptr,
  72                                                     sizeof (tmp)))
  73                                         return -EFAULT;
  74                                 return sys_msgrcv (first, tmp.msgp, second,
  75                                                    tmp.msgtyp, third);
  76                                 }
  77                         default:
  78                                 return sys_msgrcv (first,
  79                                                    (struct msgbuf *) ptr,
  80                                                    second, fifth, third);
  81                         }
  82                 case MSGGET:
  83                         return sys_msgget ((key_t) first, second);
  84                 case MSGCTL:
  85                         return sys_msgctl (first, second,
  86                                            (struct msqid_ds *) ptr);
  87                 default:
  88                         return -EINVAL;
  89                 }
  90         if (call <= SHMCTL)
  91                 switch (call) {
  92                 case SHMAT:
  93                         switch (version) {
  94                         default: {
  95                                 ulong raddr;
  96                                 ret = do_shmat (first, (char *) ptr,
  97                                                  second, &raddr);
  98                                 if (ret)
  99                                         return ret;
 100                                 return put_user (raddr, (ulong *) third);
 101                         }
 102                         }
 103                 case SHMDT:
 104                         return sys_shmdt ((char *)ptr);
 105                 case SHMGET:
 106                         return sys_shmget (first, second, third);
 107                 case SHMCTL:
 108                         return sys_shmctl (first, second,
 109                                            (struct shmid_ds *) ptr);
 110                 default:
 111                         return -EINVAL;
 112                 }
 113
 114         return -EINVAL;
 115 }
 116
 117 /* sys_cacheflush -- no support.  */
 118 asmlinkage int
 119 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
 120 {
 121         return -EINVAL;
 122 }
 123
 124 asmlinkage int sys_getpagesize(void)
 125 {
 126         return PAGE_SIZE;
 127 }
 128
 129 #if defined(CONFIG_SYSCALL_PRINT)
 130 asmlinkage void syscall_print(void *dummy,...)
 131 {
 132         struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
 133         printk("call %06lx:%ld 1:%08lx,2:%08lx,3:%08lx,ret:%08lx\n",
 134                ((regs->pc)&0xffffff)-2,regs->orig_er0,regs->er1,regs->er2,regs->er3,regs->er0);
 135 }
 136 #endif
 137
 138 /*
 139  * Do a system call from kernel instead of calling sys_execve so we
 140  * end up with proper pt_regs.
 141  */
 142 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 143 {
 144         register long res __asm__("er0");
 145         register char *const *_c __asm__("er3") = envp;
 146         register char *const *_b __asm__("er2") = argv;
 147         register const char * _a __asm__("er1") = filename;
 148         __asm__ __volatile__ ("mov.l %1,er0\n\t"
 149                         "trapa  #0\n\t"
 150                         : "=r" (res)
 151                         : "g" (__NR_execve),
 152                           "g" (_a),
 153                           "g" (_b),
 154                           "g" (_c)
 155                         : "cc", "memory");
 156         return res;
 157 }
 158
 159