arch/microblaze/kernel/sys_microblaze.c

   1 /*
   2  * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
   3  * Copyright (C) 2007-2009 PetaLogix
   4  * Copyright (C) 2007 John Williams <john.williams@petalogix.com>
   5  *
   6  * Copyright (C) 2006 Atmark Techno, Inc.
   7  *      Yasushi SHOJI <yashi@atmark-techno.com>
   8  *      Tetsuya OHKAWA <tetsuya@atmark-techno.com>
   9  *
  10  * This file is subject to the terms and conditions of the GNU General Public
  11  * License. See the file "COPYING" in the main directory of this archive
  12  * for more details.
  13  */
  14
  15 #include <linux/errno.h>
  16 #include <linux/mm.h>
  17 #include <linux/smp.h>
  18 #include <linux/smp_lock.h>
  19 #include <linux/syscalls.h>
  20 #include <linux/sem.h>
  21 #include <linux/msg.h>
  22 #include <linux/shm.h>
  23 #include <linux/stat.h>
  24 #include <linux/mman.h>
  25 #include <linux/sys.h>
  26 #include <linux/ipc.h>
  27 #include <linux/utsname.h>
  28 #include <linux/file.h>
  29 #include <linux/module.h>
  30 #include <linux/err.h>
  31 #include <linux/fs.h>
  32 #include <linux/semaphore.h>
  33 #include <linux/uaccess.h>
  34 #include <linux/unistd.h>
  35
  36 #include <asm/syscalls.h>
  37 /*
  38  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  39  *
  40  * This is really horribly ugly. This will be remove with new toolchain.
  41  */
  42 asmlinkage int
  43 sys_ipc(uint call, int first, int second, int third, void *ptr, long fifth)
  44 {
  45         int version, ret;
  46
  47         version = call >> 16; /* hack for backward compatibility */
  48         call &= 0xffff;
  49
  50         ret = -EINVAL;
  51         switch (call) {
  52         case SEMOP:
  53                 ret = sys_semop(first, (struct sembuf *)ptr, second);
  54                 break;
  55         case SEMGET:
  56                 ret = sys_semget(first, second, third);
  57                 break;
  58         case SEMCTL:
  59         {
  60                 union semun fourth;
  61
  62                 if (!ptr)
  63                         break;
  64                 ret = (access_ok(VERIFY_READ, ptr, sizeof(long)) ? 0 : -EFAULT)
  65                                 || (get_user(fourth.__pad, (void **)ptr)) ;
  66                 if (ret)
  67                         break;
  68                 ret = sys_semctl(first, second, third, fourth);
  69                 break;
  70         }
  71         case MSGSND:
  72                 ret = sys_msgsnd(first, (struct msgbuf *) ptr, second, third);
  73                 break;
  74         case MSGRCV:
  75                 switch (version) {
  76                 case 0: {
  77                         struct ipc_kludge tmp;
  78
  79                         if (!ptr)
  80                                 break;
  81                         ret = (access_ok(VERIFY_READ, ptr, sizeof(tmp))
  82                                 ? 0 : -EFAULT) || copy_from_user(&tmp,
  83                                 (struct ipc_kludge *) ptr, sizeof(tmp));
  84                         if (ret)
  85                                 break;
  86                         ret = sys_msgrcv(first, tmp.msgp, second, tmp.msgtyp,
  87                                         third);
  88                         break;
  89                         }
  90                 default:
  91                         ret = sys_msgrcv(first, (struct msgbuf *) ptr,
  92                                         second, fifth, third);
  93                         break;
  94                 }
  95                 break;
  96         case MSGGET:
  97                 ret = sys_msgget((key_t) first, second);
  98                 break;
  99         case MSGCTL:
 100                 ret = sys_msgctl(first, second, (struct msqid_ds *) ptr);
 101                 break;
 102         case SHMAT:
 103                 switch (version) {
 104                 default: {
 105                         ulong raddr;
 106                         ret = access_ok(VERIFY_WRITE, (ulong *) third,
 107                                         sizeof(ulong)) ? 0 : -EFAULT;
 108                         if (ret)
 109                                 break;
 110                         ret = do_shmat(first, (char *) ptr, second, &raddr);
 111                         if (ret)
 112                                 break;
 113                         ret = put_user(raddr, (ulong *) third);
 114                         break;
 115                         }
 116                 case 1: /* iBCS2 emulator entry point */
 117                         if (!segment_eq(get_fs(), get_ds()))
 118                                 break;
 119                         ret = do_shmat(first, (char *) ptr, second,
 120                                         (ulong *) third);
 121                         break;
 122                 }
 123                 break;
 124         case SHMDT:
 125                 ret = sys_shmdt((char *)ptr);
 126                 break;
 127         case SHMGET:
 128                 ret = sys_shmget(first, second, third);
 129                 break;
 130         case SHMCTL:
 131                 ret = sys_shmctl(first, second, (struct shmid_ds *) ptr);
 132                 break;
 133         }
 134         return ret;
 135 }
 136
 137 asmlinkage int sys_vfork(struct pt_regs *regs)
 138 {
 139         return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->r1,
 140                                                 regs, 0, NULL, NULL);
 141 }
 142
 143 asmlinkage int sys_clone(int flags, unsigned long stack, struct pt_regs *regs)
 144 {
 145         if (!stack)
 146                 stack = regs->r1;
 147         return do_fork(flags, stack, regs, 0, NULL, NULL);
 148 }
 149
 150 asmlinkage int sys_execve(char __user *filenamei, char __user *__user *argv,
 151                         char __user *__user *envp, struct pt_regs *regs)
 152 {
 153         int error;
 154         char *filename;
 155
 156         filename = getname(filenamei);
 157         error = PTR_ERR(filename);
 158         if (IS_ERR(filename))
 159                 goto out;
 160         error = do_execve(filename, argv, envp, regs);
 161         putname(filename);
 162 out:
 163         return error;
 164 }
 165
 166 asmlinkage unsigned long
 167 sys_mmap2(unsigned long addr, size_t len,
 168         unsigned long prot, unsigned long flags,
 169         unsigned long fd, unsigned long pgoff)
 170 {
 171         struct file *file = NULL;
 172         int ret = -EBADF;
 173
 174         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 175         if (!(flags & MAP_ANONYMOUS)) {
 176                 file = fget(fd);
 177                 if (!file) {
 178                         printk(KERN_INFO "no fd in mmap\r\n");
 179                         goto out;
 180                 }
 181         }
 182
 183         down_write(&current->mm->mmap_sem);
 184         ret = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 185         up_write(&current->mm->mmap_sem);
 186         if (file)
 187                 fput(file);
 188 out:
 189         return ret;
 190 }
 191
 192 asmlinkage unsigned long sys_mmap(unsigned long addr, size_t len,
 193                         unsigned long prot, unsigned long flags,
 194                         unsigned long fd, off_t offset)
 195 {
 196         int err = -EINVAL;
 197
 198         if (offset & ~PAGE_MASK) {
 199                 printk(KERN_INFO "no pagemask in mmap\r\n");
 200                 goto out;
 201         }
 202
 203         err = sys_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
 204 out:
 205         return err;
 206 }
 207
 208 /*
 209  * Do a system call from kernel instead of calling sys_execve so we
 210  * end up with proper pt_regs.
 211  */
 212 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 213 {
 214         register const char *__a __asm__("r5") = filename;
 215         register const void *__b __asm__("r6") = argv;
 216         register const void *__c __asm__("r7") = envp;
 217         register unsigned long __syscall __asm__("r12") = __NR_execve;
 218         register unsigned long __ret __asm__("r3");
 219         __asm__ __volatile__ ("brki r14, 0x8"
 220                         : "=r" (__ret), "=r" (__syscall)
 221                         : "1" (__syscall), "r" (__a), "r" (__b), "r" (__c)
 222                         : "r4", "r8", "r9",
 223                         "r10", "r11", "r14", "cc", "memory");
 224         return __ret;
 225 }