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   1 /*
   2  * linux/arch/m32r/kernel/sys_m32r.c
   3  *
   4  * This file contains various random system calls that
   5  * have a non-standard calling sequence on the Linux/M32R platform.
   6  *
   7  * Taken from i386 version.
   8  */
   9
  10 #include <linux/errno.h>
  11 #include <linux/sched.h>
  12 #include <linux/mm.h>
  13 #include <linux/smp.h>
  14 #include <linux/smp_lock.h>
  15 #include <linux/sem.h>
  16 #include <linux/msg.h>
  17 #include <linux/shm.h>
  18 #include <linux/stat.h>
  19 #include <linux/syscalls.h>
  20 #include <linux/mman.h>
  21 #include <linux/file.h>
  22 #include <linux/utsname.h>
  23
  24 #include <asm/uaccess.h>
  25 #include <asm/cachectl.h>
  26 #include <asm/cacheflush.h>
  27 #include <asm/ipc.h>
  28
  29 /*
  30  * sys_tas() - test-and-set
  31  */
  32 asmlinkage int sys_tas(int *addr)
  33 {
  34         int oldval;
  35
  36         if (!access_ok(VERIFY_WRITE, addr, sizeof (int)))
  37                 return -EFAULT;
  38
  39         /* atomic operation:
  40          *   oldval = *addr; *addr = 1;
  41          */
  42         __asm__ __volatile__ (
  43                 DCACHE_CLEAR("%0", "r4", "%1")
  44                 "       .fillinsn\n"
  45                 "1:\n"
  46                 "       lock    %0, @%1     ->  unlock  %2, @%1\n"
  47                 "2:\n"
  48                 /* NOTE:
  49                  *   The m32r processor can accept interrupts only
  50                  *   at the 32-bit instruction boundary.
  51                  *   So, in the above code, the "unlock" instruction
  52                  *   can be executed continuously after the "lock"
  53                  *   instruction execution without any interruptions.
  54                  */
  55                 ".section .fixup,\"ax\"\n"
  56                 "       .balign 4\n"
  57                 "3:     ldi     %0, #%3\n"
  58                 "       seth    r14, #high(2b)\n"
  59                 "       or3     r14, r14, #low(2b)\n"
  60                 "       jmp     r14\n"
  61                 ".previous\n"
  62                 ".section __ex_table,\"a\"\n"
  63                 "       .balign 4\n"
  64                 "       .long 1b,3b\n"
  65                 ".previous\n"
  66                 : "=&r" (oldval)
  67                 : "r" (addr), "r" (1), "i"(-EFAULT)
  68                 : "r14", "memory"
  69 #ifdef CONFIG_CHIP_M32700_TS1
  70                   , "r4"
  71 #endif /* CONFIG_CHIP_M32700_TS1 */
  72         );
  73
  74         return oldval;
  75 }
  76
  77 /*
  78  * sys_pipe() is the normal C calling standard for creating
  79  * a pipe. It's not the way Unix traditionally does this, though.
  80  */
  81 asmlinkage int
  82 sys_pipe(unsigned long r0, unsigned long r1, unsigned long r2,
  83         unsigned long r3, unsigned long r4, unsigned long r5,
  84         unsigned long r6, struct pt_regs regs)
  85 {
  86         int fd[2];
  87         int error;
  88
  89         error = do_pipe(fd);
  90         if (!error) {
  91                 if (copy_to_user((void *)r0, (void *)fd, 2*sizeof(int)))
  92                         error = -EFAULT;
  93         }
  94         return error;
  95 }
  96
  97 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  98         unsigned long prot, unsigned long flags,
  99         unsigned long fd, unsigned long pgoff)
 100 {
 101         int error = -EBADF;
 102         struct file *file = NULL;
 103
 104         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 105         if (!(flags & MAP_ANONYMOUS)) {
 106                 file = fget(fd);
 107                 if (!file)
 108                         goto out;
 109         }
 110
 111         down_write(&current->mm->mmap_sem);
 112         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 113         up_write(&current->mm->mmap_sem);
 114
 115         if (file)
 116                 fput(file);
 117 out:
 118         return error;
 119 }
 120
 121 /*
 122  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 123  *
 124  * This is really horribly ugly.
 125  */
 126 asmlinkage int sys_ipc(uint call, int first, int second,
 127                        int third, void __user *ptr, long fifth)
 128 {
 129         int version, ret;
 130
 131         version = call >> 16; /* hack for backward compatibility */
 132         call &= 0xffff;
 133
 134         switch (call) {
 135         case SEMOP:
 136                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
 137                                       second, NULL);
 138         case SEMTIMEDOP:
 139                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
 140                                       second, (const struct timespec __user *)fifth);
 141         case SEMGET:
 142                 return sys_semget (first, second, third);
 143         case SEMCTL: {
 144                 union semun fourth;
 145                 if (!ptr)
 146                         return -EINVAL;
 147                 if (get_user(fourth.__pad, (void __user * __user *) ptr))
 148                         return -EFAULT;
 149                 return sys_semctl (first, second, third, fourth);
 150                 }
 151
 152         case MSGSND:
 153                 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 154                                    second, third);
 155         case MSGRCV:
 156                 switch (version) {
 157                 case 0: {
 158                         struct ipc_kludge tmp;
 159                         if (!ptr)
 160                                 return -EINVAL;
 161
 162                         if (copy_from_user(&tmp,
 163                                            (struct ipc_kludge __user *) ptr,
 164                                            sizeof (tmp)))
 165                                 return -EFAULT;
 166                         return sys_msgrcv (first, tmp.msgp, second,
 167                                            tmp.msgtyp, third);
 168                         }
 169                 default:
 170                         return sys_msgrcv (first,
 171                                            (struct msgbuf __user *) ptr,
 172                                            second, fifth, third);
 173                 }
 174         case MSGGET:
 175                 return sys_msgget ((key_t) first, second);
 176         case MSGCTL:
 177                 return sys_msgctl (first, second,
 178                                    (struct msqid_ds __user *) ptr);
 179         case SHMAT: {
 180                 ulong raddr;
 181
 182                 if (!access_ok(VERIFY_WRITE, (ulong __user *) third,
 183                                       sizeof(ulong)))
 184                         return -EFAULT;
 185                 ret = do_shmat (first, (char __user *) ptr, second, &raddr);
 186                 if (ret)
 187                         return ret;
 188                 return put_user (raddr, (ulong __user *) third);
 189                 }
 190         case SHMDT:
 191                 return sys_shmdt ((char __user *)ptr);
 192         case SHMGET:
 193                 return sys_shmget (first, second, third);
 194         case SHMCTL:
 195                 return sys_shmctl (first, second,
 196                                    (struct shmid_ds __user *) ptr);
 197         default:
 198                 return -ENOSYS;
 199         }
 200 }
 201
 202 asmlinkage int sys_uname(struct old_utsname * name)
 203 {
 204         int err;
 205         if (!name)
 206                 return -EFAULT;
 207         down_read(&uts_sem);
 208         err=copy_to_user(name, &system_utsname, sizeof (*name));
 209         up_read(&uts_sem);
 210         return err?-EFAULT:0;
 211 }
 212
 213 asmlinkage int sys_cacheflush(void *addr, int bytes, int cache)
 214 {
 215         /* This should flush more selectivly ...  */
 216         _flush_cache_all();
 217         return 0;
 218 }
 219
 220 asmlinkage int sys_cachectl(char *addr, int nbytes, int op)
 221 {
 222         /* Not implemented yet. */
 223         return -ENOSYS;
 224 }
 225