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sys_arm.c

/*
 *  linux/arch/arm/kernel/sys_arm.c
 *
 *  Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c
 *  Copyright (C) 1995, 1996 Russell King.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  This file contains various random system calls that
 *  have a non-standard calling sequence on the Linux/arm
 *  platform.
 */
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/syscalls.h>
#include <linux/mman.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/ipc.h>
#include <linux/uaccess.h>

00031 struct mmap_arg_struct {
      unsigned long addr;
      unsigned long len;
      unsigned long prot;
      unsigned long flags;
      unsigned long fd;
      unsigned long offset;
};

asmlinkage int old_mmap(struct mmap_arg_struct __user *arg)
{
      int error = -EFAULT;
      struct mmap_arg_struct a;

      if (copy_from_user(&a, arg, sizeof(a)))
            goto out;

      error = -EINVAL;
      if (a.offset & ~PAGE_MASK)
            goto out;

      error = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
out:
      return error;
}

/*
 * Perform the select(nd, in, out, ex, tv) and mmap() system
 * calls.
 */

00062 struct sel_arg_struct {
      unsigned long n;
      fd_set __user *inp, *outp, *exp;
      struct timeval __user *tvp;
};

asmlinkage int old_select(struct sel_arg_struct __user *arg)
{
      struct sel_arg_struct a;

      if (copy_from_user(&a, arg, sizeof(a)))
            return -EFAULT;
      /* sys_select() does the appropriate kernel locking */
      return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
}

#if !defined(CONFIG_AEABI) || defined(CONFIG_OABI_COMPAT)
/*
 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 *
 * This is really horribly ugly.
 */
asmlinkage int sys_ipc(uint call, int first, int second, int third,
                   void __user *ptr, long fifth)
{
      int version, ret;

      version = call >> 16; /* hack for backward compatibility */
      call &= 0xffff;

      switch (call) {
      case SEMOP:
            return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
      case SEMTIMEDOP:
            return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
                              (const struct timespec __user *)fifth);

      case SEMGET:
            return sys_semget (first, second, third);
      case SEMCTL: {
            union semun fourth;
            if (!ptr)
                  return -EINVAL;
            if (get_user(fourth.__pad, (void __user * __user *) ptr))
                  return -EFAULT;
            return sys_semctl (first, second, third, fourth);
      }

      case MSGSND:
            return sys_msgsnd(first, (struct msgbuf __user *) ptr, 
                          second, third);
      case MSGRCV:
            switch (version) {
            case 0: {
                  struct ipc_kludge tmp;
                  if (!ptr)
                        return -EINVAL;
                  if (copy_from_user(&tmp,(struct ipc_kludge __user *)ptr,
                                 sizeof (tmp)))
                        return -EFAULT;
                  return sys_msgrcv (first, tmp.msgp, second,
                                 tmp.msgtyp, third);
            }
            default:
                  return sys_msgrcv (first,
                                 (struct msgbuf __user *) ptr,
                                 second, fifth, third);
            }
      case MSGGET:
            return sys_msgget ((key_t) first, second);
      case MSGCTL:
            return sys_msgctl(first, second, (struct msqid_ds __user *)ptr);

      case SHMAT:
            switch (version) {
            default: {
                  ulong raddr;
                  ret = do_shmat(first, (char __user *)ptr, second, &raddr);
                  if (ret)
                        return ret;
                  return put_user(raddr, (ulong __user *)third);
            }
            case 1: /* Of course, we don't support iBCS2! */
                  return -EINVAL;
            }
      case SHMDT: 
            return sys_shmdt ((char __user *)ptr);
      case SHMGET:
            return sys_shmget (first, second, third);
      case SHMCTL:
            return sys_shmctl (first, second,
                           (struct shmid_ds __user *) ptr);
      default:
            return -ENOSYS;
      }
}
#endif

/* Fork a new task - this creates a new program thread.
 * This is called indirectly via a small wrapper
 */
asmlinkage int sys_fork(struct pt_regs *regs)
{
#ifdef CONFIG_MMU
      return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
#else
      /* can not support in nommu mode */
      return(-EINVAL);
#endif
}

/* Clone a task - this clones the calling program thread.
 * This is called indirectly via a small wrapper
 */
asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
                   int __user *parent_tidptr, int tls_val,
                   int __user *child_tidptr, struct pt_regs *regs)
{
      if (!newsp)
            newsp = regs->ARM_sp;

      return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
}

asmlinkage int sys_vfork(struct pt_regs *regs)
{
      return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
}

/* sys_execve() executes a new program.
 * This is called indirectly via a small wrapper
 */
asmlinkage int sys_execve(char __user *filenamei, char __user * __user *argv,
                    char __user * __user *envp, struct pt_regs *regs)
{
      int error;
      char * filename;

      filename = getname(filenamei);
      error = PTR_ERR(filename);
      if (IS_ERR(filename))
            goto out;
      error = do_execve(filename, argv, envp, regs);
      putname(filename);
out:
      return error;
}

int kernel_execve(const char *filename, char *const argv[], char *const envp[])
{
      struct pt_regs regs;
      int ret;

      memset(&regs, 0, sizeof(struct pt_regs));
      ret = do_execve((char *)filename, (char __user * __user *)argv,
                  (char __user * __user *)envp, &regs);
      if (ret < 0)
            goto out;

      /*
       * Save argc to the register structure for userspace.
       */
      regs.ARM_r0 = ret;

      /*
       * We were successful.  We won't be returning to our caller, but
       * instead to user space by manipulating the kernel stack.
       */
      asm(  "add  r0, %0, %1\n\t"
            "mov  r1, %2\n\t"
            "mov  r2, %3\n\t"
            "bl   memmove\n\t"      /* copy regs to top of stack */
            "mov  r8, #0\n\t" /* not a syscall */
            "mov  r9, %0\n\t" /* thread structure */
            "mov  sp, r0\n\t" /* reposition stack pointer */
            "b    ret_to_user"
            :
            : "r" (current_thread_info()),
              "Ir" (THREAD_START_SP - sizeof(regs)),
              "r" (&regs),
              "Ir" (sizeof(regs))
            : "r0", "r1", "r2", "r3", "ip", "lr", "memory");

 out:
      return ret;
}
EXPORT_SYMBOL(kernel_execve);

/*
 * Since loff_t is a 64 bit type we avoid a lot of ABI hassle
 * with a different argument ordering.
 */
asmlinkage long sys_arm_fadvise64_64(int fd, int advice,
                             loff_t offset, loff_t len)
{
      return sys_fadvise64_64(fd, offset, len, advice);
}

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