arch/sh64/kernel/sys_sh64.c

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