LXR linux/arch/h8300/kernel/sys

   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 * Perform the select(nd, in, out, ex, tv) and mmap() system
  31 * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
  32 * handle more than 4 system call parameters, so these system calls
  33 * used a memory block for parameter passing..
  34 */
  35
  36struct mmap_arg_struct {
  37        unsigned long addr;
  38        unsigned long len;
  39        unsigned long prot;
  40        unsigned long flags;
  41        unsigned long fd;
  42        unsigned long offset;
  43};
  44
  45asmlinkage int old_mmap(struct mmap_arg_struct *arg)
  46{
  47        struct mmap_arg_struct a;
  48        int error = -EFAULT;
  49
  50        if (copy_from_user(&a, arg, sizeof(a)))
  51                goto out;
  52
  53        error = -EINVAL;
  54        if (a.offset & ~PAGE_MASK)
  55                goto out;
  56
  57        error = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
  58                               a.offset >> PAGE_SHIFT);
  59out:
  60        return error;
  61}
  62
  63struct sel_arg_struct {
  64        unsigned long n;
  65        fd_set *inp, *outp, *exp;
  66        struct timeval *tvp;
  67};
  68
  69asmlinkage int old_select(struct sel_arg_struct *arg)
  70{
  71        struct sel_arg_struct a;
  72
  73        if (copy_from_user(&a, arg, sizeof(a)))
  74                return -EFAULT;
  75        /* sys_select() does the appropriate kernel locking */
  76        return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
  77}
  78
  79/*
  80 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  81 *
  82 * This is really horribly ugly.
  83 */
  84asmlinkage int sys_ipc (uint call, int first, int second,
  85                        int third, void *ptr, long fifth)
  86{
  87        int version, ret;
  88
  89        version = call >> 16; /* hack for backward compatibility */
  90        call &= 0xffff;
  91
  92        if (call <= SEMCTL)
  93                switch (call) {
  94                case SEMOP:
  95                        return sys_semop (first, (struct sembuf *)ptr, second);
  96                case SEMGET:
  97                        return sys_semget (first, second, third);
  98                case SEMCTL: {
  99                        union semun fourth;
 100                        if (!ptr)
 101                                return -EINVAL;
 102                        if (get_user(fourth.__pad, (void **) ptr))
 103                                return -EFAULT;
 104                        return sys_semctl (first, second, third, fourth);
 105                        }
 106                default:
 107                        return -EINVAL;
 108                }
 109        if (call <= MSGCTL) 
 110                switch (call) {
 111                case MSGSND:
 112                        return sys_msgsnd (first, (struct msgbuf *) ptr, 
 113                                          second, third);
 114                case MSGRCV:
 115                        switch (version) {
 116                        case 0: {
 117                                struct ipc_kludge tmp;
 118                                if (!ptr)
 119                                        return -EINVAL;
 120                                if (copy_from_user (&tmp,
 121                                                    (struct ipc_kludge *)ptr,
 122                                                    sizeof (tmp)))
 123                                        return -EFAULT;
 124                                return sys_msgrcv (first, tmp.msgp, second,
 125                                                   tmp.msgtyp, third);
 126                                }
 127                        default:
 128                                return sys_msgrcv (first,
 129                                                   (struct msgbuf *) ptr,
 130                                                   second, fifth, third);
 131                        }
 132                case MSGGET:
 133                        return sys_msgget ((key_t) first, second);
 134                case MSGCTL:
 135                        return sys_msgctl (first, second,
 136                                           (struct msqid_ds *) ptr);
 137                default:
 138                        return -EINVAL;
 139                }
 140        if (call <= SHMCTL) 
 141                switch (call) {
 142                case SHMAT:
 143                        switch (version) {
 144                        default: {
 145                                ulong raddr;
 146                                ret = do_shmat (first, (char *) ptr,
 147                                                 second, &raddr);
 148                                if (ret)
 149                                        return ret;
 150                                return put_user (raddr, (ulong *) third);
 151                        }
 152                        }
 153                case SHMDT: 
 154                        return sys_shmdt ((char *)ptr);
 155                case SHMGET:
 156                        return sys_shmget (first, second, third);
 157                case SHMCTL:
 158                        return sys_shmctl (first, second,
 159                                           (struct shmid_ds *) ptr);
 160                default:
 161                        return -EINVAL;
 162                }
 163
 164        return -EINVAL;
 165}
 166
 167/* sys_cacheflush -- no support.  */
 168asmlinkage int
 169sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
 170{
 171        return -EINVAL;
 172}
 173
 174asmlinkage int sys_getpagesize(void)
 175{
 176        return PAGE_SIZE;
 177}
 178
 179#if defined(CONFIG_SYSCALL_PRINT)
 180asmlinkage void syscall_print(void *dummy,...)
 181{
 182        struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
 183        printk("call %06lx:%ld 1:%08lx,2:%08lx,3:%08lx,ret:%08lx\n",
 184               ((regs->pc)&0xffffff)-2,regs->orig_er0,regs->er1,regs->er2,regs->er3,regs->er0);
 185}
 186#endif
 187
 188/*
 189 * Do a system call from kernel instead of calling sys_execve so we
 190 * end up with proper pt_regs.
 191 */
 192int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 193{
 194        register long res __asm__("er0");
 195        register char *const *_c __asm__("er3") = envp;
 196        register char *const *_b __asm__("er2") = argv;
 197        register const char * _a __asm__("er1") = filename;
 198        __asm__ __volatile__ ("mov.l %1,er0\n\t"
 199                        "trapa  #0\n\t"
 200                        : "=r" (res)
 201                        : "g" (__NR_execve),
 202                          "g" (_a),
 203                          "g" (_b),
 204                          "g" (_c)
 205                        : "cc", "memory");
 206        return res;
 207}
 208
 209
 210