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   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * arch/sh64/kernel/sys_sh64.c
   7  *
   8  * Copyright (C) 2000, 2001  Paolo Alberelli
   9  *
  10  * This file contains various random system calls that
  11  * have a non-standard calling sequence on the Linux/SH5
  12  * platform.
  13  *
  14  * Mostly taken from i386 version.
  15  *
  16  */
  17
  18 #include <linux/errno.h>
  19 #include <linux/rwsem.h>
  20 #include <linux/sched.h>
  21 #include <linux/mm.h>
  22 #include <linux/fs.h>
  23 #include <linux/smp.h>
  24 #include <linux/sem.h>
  25 #include <linux/msg.h>
  26 #include <linux/shm.h>
  27 #include <linux/stat.h>
  28 #include <linux/mman.h>
  29 #include <linux/file.h>
  30 #include <linux/utsname.h>
  31 #include <linux/syscalls.h>
  32 #include <linux/ipc.h>
  33 #include <asm/uaccess.h>
  34 #include <asm/ptrace.h>
  35 #include <asm/unistd.h>
  36
  37 #define REG_3   3
  38
  39 /*
  40  * sys_pipe() is the normal C calling standard for creating
  41  * a pipe. It's not the way Unix traditionally does this, though.
  42  */
  43 #ifdef NEW_PIPE_IMPLEMENTATION
  44 asmlinkage int sys_pipe(unsigned long * fildes,
  45                         unsigned long   dummy_r3,
  46                         unsigned long   dummy_r4,
  47                         unsigned long   dummy_r5,
  48                         unsigned long   dummy_r6,
  49                         unsigned long   dummy_r7,
  50                         struct pt_regs * regs)     /* r8 = pt_regs  forced by entry.S */
  51 {
  52         int fd[2];
  53         int ret;
  54
  55         ret = do_pipe(fd);
  56         if (ret == 0)
  57                 /*
  58                  ***********************************************************************
  59                  *   To avoid the copy_to_user we prefer to break the ABIs convention, *
  60                  *   packing the valid pair of file IDs into a single register (r3);   *
  61                  *   while r2 is the return code as defined by the sh5-ABIs.           *
  62                  *   BE CAREFUL: pipe stub, into glibc, must be aware of this solution *
  63                  ***********************************************************************
  64
  65 #ifdef __LITTLE_ENDIAN__
  66                 regs->regs[REG_3] = (((unsigned long long) fd[1]) << 32) | ((unsigned long long) fd[0]);
  67 #else
  68                 regs->regs[REG_3] = (((unsigned long long) fd[0]) << 32) | ((unsigned long long) fd[1]);
  69 #endif
  70
  71                 */
  72                /* although not very clever this is endianess independent */
  73                 regs->regs[REG_3] = (unsigned long long) *((unsigned long long *) fd);
  74
  75         return ret;
  76 }
  77
  78 #else
  79 asmlinkage int sys_pipe(unsigned long * fildes)
  80 {
  81         int fd[2];
  82         int error;
  83
  84         error = do_pipe(fd);
  85         if (!error) {
  86                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
  87                         error = -EFAULT;
  88         }
  89         return error;
  90 }
  91
  92 #endif
  93
  94 /*
  95  * To avoid cache alias, we map the shard page with same color.
  96  */
  97 #define COLOUR_ALIGN(addr)      (((addr)+SHMLBA-1)&~(SHMLBA-1))
  98
  99 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
 100         unsigned long len, unsigned long pgoff, unsigned long flags)
 101 {
 102         struct vm_area_struct *vma;
 103
 104         if (flags & MAP_FIXED) {
 105                 /* We do not accept a shared mapping if it would violate
 106                  * cache aliasing constraints.
 107                  */
 108                 if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1)))
 109                         return -EINVAL;
 110                 return addr;
 111         }
 112
 113         if (len > TASK_SIZE)
 114                 return -ENOMEM;
 115         if (!addr)
 116                 addr = TASK_UNMAPPED_BASE;
 117
 118         if (flags & MAP_PRIVATE)
 119                 addr = PAGE_ALIGN(addr);
 120         else
 121                 addr = COLOUR_ALIGN(addr);
 122
 123         for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
 124                 /* At this point:  (!vma || addr < vma->vm_end). */
 125                 if (TASK_SIZE - len < addr)
 126                         return -ENOMEM;
 127                 if (!vma || addr + len <= vma->vm_start)
 128                         return addr;
 129                 addr = vma->vm_end;
 130                 if (!(flags & MAP_PRIVATE))
 131                         addr = COLOUR_ALIGN(addr);
 132         }
 133 }
 134
 135 /* common code for old and new mmaps */
 136 static inline long do_mmap2(
 137         unsigned long addr, unsigned long len,
 138         unsigned long prot, unsigned long flags,
 139         unsigned long fd, unsigned long pgoff)
 140 {
 141         int error = -EBADF;
 142         struct file * file = NULL;
 143
 144         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 145         if (!(flags & MAP_ANONYMOUS)) {
 146                 file = fget(fd);
 147                 if (!file)
 148                         goto out;
 149         }
 150
 151         down_write(&current->mm->mmap_sem);
 152         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 153         up_write(&current->mm->mmap_sem);
 154
 155         if (file)
 156                 fput(file);
 157 out:
 158         return error;
 159 }
 160
 161 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
 162         unsigned long prot, unsigned long flags,
 163         unsigned long fd, unsigned long pgoff)
 164 {
 165         return do_mmap2(addr, len, prot, flags, fd, pgoff);
 166 }
 167
 168 asmlinkage int old_mmap(unsigned long addr, unsigned long len,
 169         unsigned long prot, unsigned long flags,
 170         int fd, unsigned long off)
 171 {
 172         if (off & ~PAGE_MASK)
 173                 return -EINVAL;
 174         return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
 175 }
 176
 177 /*
 178  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 179  *
 180  * This is really horribly ugly.
 181  */
 182 asmlinkage int sys_ipc(uint call, int first, int second,
 183                        int third, void __user *ptr, long fifth)
 184 {
 185         int version, ret;
 186
 187         version = call >> 16; /* hack for backward compatibility */
 188         call &= 0xffff;
 189
 190         if (call <= SEMCTL)
 191                 switch (call) {
 192                 case SEMOP:
 193                         return sys_semtimedop(first, (struct sembuf __user *)ptr,
 194                                               second, NULL);
 195                 case SEMTIMEDOP:
 196                         return sys_semtimedop(first, (struct sembuf __user *)ptr,
 197                                               second,
 198                                               (const struct timespec __user *)fifth);
 199                 case SEMGET:
 200                         return sys_semget (first, second, third);
 201                 case SEMCTL: {
 202                         union semun fourth;
 203                         if (!ptr)
 204                                 return -EINVAL;
 205                         if (get_user(fourth.__pad, (void * __user *) ptr))
 206                                 return -EFAULT;
 207                         return sys_semctl (first, second, third, fourth);
 208                         }
 209                 default:
 210                         return -EINVAL;
 211                 }
 212
 213         if (call <= MSGCTL)
 214                 switch (call) {
 215                 case MSGSND:
 216                         return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 217                                           second, third);
 218                 case MSGRCV:
 219                         switch (version) {
 220                         case 0: {
 221                                 struct ipc_kludge tmp;
 222                                 if (!ptr)
 223                                         return -EINVAL;
 224
 225                                 if (copy_from_user(&tmp,
 226                                                    (struct ipc_kludge __user *) ptr,
 227                                                    sizeof (tmp)))
 228                                         return -EFAULT;
 229                                 return sys_msgrcv (first, tmp.msgp, second,
 230                                                    tmp.msgtyp, third);
 231                                 }
 232                         default:
 233                                 return sys_msgrcv (first,
 234                                                    (struct msgbuf __user *) ptr,
 235                                                    second, fifth, third);
 236                         }
 237                 case MSGGET:
 238                         return sys_msgget ((key_t) first, second);
 239                 case MSGCTL:
 240                         return sys_msgctl (first, second,
 241                                            (struct msqid_ds __user *) ptr);
 242                 default:
 243                         return -EINVAL;
 244                 }
 245         if (call <= SHMCTL)
 246                 switch (call) {
 247                 case SHMAT:
 248                         switch (version) {
 249                         default: {
 250                                 ulong raddr;
 251                                 ret = do_shmat (first, (char __user *) ptr,
 252                                                  second, &raddr);
 253                                 if (ret)
 254                                         return ret;
 255                                 return put_user (raddr, (ulong __user *) third);
 256                         }
 257                         case 1: /* iBCS2 emulator entry point */
 258                                 if (!segment_eq(get_fs(), get_ds()))
 259                                         return -EINVAL;
 260                                 return do_shmat (first, (char __user *) ptr,
 261                                                   second, (ulong *) third);
 262                         }
 263                 case SHMDT:
 264                         return sys_shmdt ((char __user *)ptr);
 265                 case SHMGET:
 266                         return sys_shmget (first, second, third);
 267                 case SHMCTL:
 268                         return sys_shmctl (first, second,
 269                                            (struct shmid_ds __user *) ptr);
 270                 default:
 271                         return -EINVAL;
 272                 }
 273
 274         return -EINVAL;
 275 }
 276
 277 asmlinkage int sys_uname(struct old_utsname * name)
 278 {
 279         int err;
 280         if (!name)
 281                 return -EFAULT;
 282         down_read(&uts_sem);
 283         err = copy_to_user(name, utsname(), sizeof (*name));
 284         up_read(&uts_sem);
 285         return err?-EFAULT:0;
 286 }
 287
 288 /*
 289  * Do a system call from kernel instead of calling sys_execve so we
 290  * end up with proper pt_regs.
 291  */
 292 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 293 {
 294         register unsigned long __sc0 __asm__ ("r9") = ((0x13 << 16) | __NR_execve);
 295         register unsigned long __sc2 __asm__ ("r2") = (unsigned long) filename;
 296         register unsigned long __sc3 __asm__ ("r3") = (unsigned long) argv;
 297         register unsigned long __sc4 __asm__ ("r4") = (unsigned long) envp;
 298         __asm__ __volatile__ ("trapa    %1 !\t\t\t execve(%2,%3,%4)"
 299         : "=r" (__sc0)
 300         : "r" (__sc0), "r" (__sc2), "r" (__sc3), "r" (__sc4) );
 301         __asm__ __volatile__ ("!dummy   %0 %1 %2 %3"
 302         : : "r" (__sc0), "r" (__sc2), "r" (__sc3), "r" (__sc4) : "memory");
 303         return __sc0;
 304 }