sys_ia32.c

linux 内核源代码

/* Translations due to time_t size differences.  Which affects all
   sorts of things, like timeval and itimerval.  */

extern struct timezone sys_tz;

asmlinkage long
sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
{
	if (tv) {
		struct timeval ktv;
		do_gettimeofday(&ktv);
		if (put_tv32(tv, &ktv))
			return -EFAULT;
	}
	if (tz) {
		if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
			return -EFAULT;
	}
	return 0;
}

asmlinkage long
sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
{
	struct timeval ktv;
	struct timespec kts;
	struct timezone ktz;

 	if (tv) {
		if (get_tv32(&ktv, tv))
			return -EFAULT;
		kts.tv_sec = ktv.tv_sec;
		kts.tv_nsec = ktv.tv_usec * NSEC_PER_USEC;
	}
	if (tz) {
		if (copy_from_user(&ktz, tz, sizeof(ktz)))
			return -EFAULT;
	}

	return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
}

struct sel_arg_struct {
	unsigned int n;
	unsigned int inp;
	unsigned int outp;
	unsigned int exp;
	unsigned int tvp;
};

asmlinkage long
sys32_old_select(struct sel_arg_struct __user *arg)
{
	struct sel_arg_struct a;

	if (copy_from_user(&a, arg, sizeof(a)))
		return -EFAULT;
	return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
				 compat_ptr(a.exp), compat_ptr(a.tvp));
}

extern asmlinkage long
compat_sys_wait4(compat_pid_t pid, compat_uint_t * stat_addr, int options,
		 struct compat_rusage *ru);

asmlinkage long
sys32_waitpid(compat_pid_t pid, unsigned int *stat_addr, int options)
{
	return compat_sys_wait4(pid, stat_addr, options, NULL);
}

/* 32-bit timeval and related flotsam.  */

asmlinkage long
sys32_sysfs(int option, u32 arg1, u32 arg2)
{
	return sys_sysfs(option, arg1, arg2);
}

asmlinkage long
sys32_sched_rr_get_interval(compat_pid_t pid, struct compat_timespec __user *interval)
{
	struct timespec t;
	int ret;
	mm_segment_t old_fs = get_fs ();
	
	set_fs (KERNEL_DS);
	ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
	set_fs (old_fs);
	if (put_compat_timespec(&t, interval))
		return -EFAULT;
	return ret;
}

asmlinkage long
sys32_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize)
{
	sigset_t s;
	compat_sigset_t s32;
	int ret;
	mm_segment_t old_fs = get_fs();
		
	set_fs (KERNEL_DS);
	ret = sys_rt_sigpending((sigset_t __user *)&s, sigsetsize);
	set_fs (old_fs);
	if (!ret) {
		switch (_NSIG_WORDS) {
		case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
		case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
		case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
		case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
		}
		if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
			return -EFAULT;
	}
	return ret;
}

asmlinkage long
sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
{
	siginfo_t info;
	int ret;
	mm_segment_t old_fs = get_fs();
	
	if (copy_siginfo_from_user32(&info, uinfo))
		return -EFAULT;
	set_fs (KERNEL_DS);
	ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *)&info);
	set_fs (old_fs);
	return ret;
}

/* These are here just in case some old ia32 binary calls it. */
asmlinkage long
sys32_pause(void)
{
	current->state = TASK_INTERRUPTIBLE;
	schedule();
	return -ERESTARTNOHAND;
}


#ifdef CONFIG_SYSCTL_SYSCALL
struct sysctl_ia32 {
	unsigned int	name;
	int		nlen;
	unsigned int	oldval;
	unsigned int	oldlenp;
	unsigned int	newval;
	unsigned int	newlen;
	unsigned int	__unused[4];
};


asmlinkage long
sys32_sysctl(struct sysctl_ia32 __user *args32)
{
	struct sysctl_ia32 a32;
	mm_segment_t old_fs = get_fs ();
	void __user *oldvalp, *newvalp;
	size_t oldlen;
	int __user *namep;
	long ret;

	if (copy_from_user(&a32, args32, sizeof (a32)))
		return -EFAULT;

	/*
	 * We need to pre-validate these because we have to disable address checking
	 * before calling do_sysctl() because of OLDLEN but we can't run the risk of the
	 * user specifying bad addresses here.  Well, since we're dealing with 32 bit
	 * addresses, we KNOW that access_ok() will always succeed, so this is an
	 * expensive NOP, but so what...
	 */
	namep = compat_ptr(a32.name);
	oldvalp = compat_ptr(a32.oldval);
	newvalp =  compat_ptr(a32.newval);

	if ((oldvalp && get_user(oldlen, (int __user *)compat_ptr(a32.oldlenp)))
	    || !access_ok(VERIFY_WRITE, namep, 0)
	    || !access_ok(VERIFY_WRITE, oldvalp, 0)
	    || !access_ok(VERIFY_WRITE, newvalp, 0))
		return -EFAULT;

	set_fs(KERNEL_DS);
	lock_kernel();
	ret = do_sysctl(namep, a32.nlen, oldvalp, (size_t __user *)&oldlen,
			newvalp, (size_t) a32.newlen);
	unlock_kernel();
	set_fs(old_fs);

	if (oldvalp && put_user (oldlen, (int __user *)compat_ptr(a32.oldlenp)))
		return -EFAULT;

	return ret;
}
#endif

/* warning: next two assume little endian */ 
asmlinkage long
sys32_pread(unsigned int fd, char __user *ubuf, u32 count, u32 poslo, u32 poshi)
{
	return sys_pread64(fd, ubuf, count,
			 ((loff_t)AA(poshi) << 32) | AA(poslo));
}

asmlinkage long
sys32_pwrite(unsigned int fd, char __user *ubuf, u32 count, u32 poslo, u32 poshi)
{
	return sys_pwrite64(fd, ubuf, count,
			  ((loff_t)AA(poshi) << 32) | AA(poslo));
}


asmlinkage long
sys32_personality(unsigned long personality)
{
	int ret;
	if (personality(current->personality) == PER_LINUX32 && 
		personality == PER_LINUX)
		personality = PER_LINUX32;
	ret = sys_personality(personality);
	if (ret == PER_LINUX32)
		ret = PER_LINUX;
	return ret;
}

asmlinkage long
sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, s32 count)
{
	mm_segment_t old_fs = get_fs();
	int ret;
	off_t of;
	
	if (offset && get_user(of, offset))
		return -EFAULT;
		
	set_fs(KERNEL_DS);
	ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL,
			   count);
	set_fs(old_fs);
	
	if (offset && put_user(of, offset))
		return -EFAULT;
		
	return ret;
}

asmlinkage long sys32_mmap2(unsigned long addr, unsigned long len,
	unsigned long prot, unsigned long flags,
	unsigned long fd, unsigned long pgoff)
{
	struct mm_struct *mm = current->mm;
	unsigned long error;
	struct file * file = NULL;

	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
	if (!(flags & MAP_ANONYMOUS)) {
		file = fget(fd);
		if (!file)
			return -EBADF;
	}

	down_write(&mm->mmap_sem);
	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
	up_write(&mm->mmap_sem);

	if (file)
		fput(file);
	return error;
}

asmlinkage long sys32_olduname(struct oldold_utsname __user * name)
{
	int err;

	if (!name)
		return -EFAULT;
	if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
		return -EFAULT;
  
  	down_read(&uts_sem);

	err = __copy_to_user(&name->sysname,&utsname()->sysname,
				__OLD_UTS_LEN);
	err |= __put_user(0,name->sysname+__OLD_UTS_LEN);
	err |= __copy_to_user(&name->nodename,&utsname()->nodename,
				__OLD_UTS_LEN);
	err |= __put_user(0,name->nodename+__OLD_UTS_LEN);
	err |= __copy_to_user(&name->release,&utsname()->release,
				__OLD_UTS_LEN);
	err |= __put_user(0,name->release+__OLD_UTS_LEN);
	err |= __copy_to_user(&name->version,&utsname()->version,
				__OLD_UTS_LEN);
	err |= __put_user(0,name->version+__OLD_UTS_LEN);
	{
		char *arch = "x86_64";
		if (personality(current->personality) == PER_LINUX32)
			arch = "i686";
		 
		err |= __copy_to_user(&name->machine, arch, strlen(arch)+1);
	}

	up_read(&uts_sem);

	err = err ? -EFAULT : 0;

	return err;
}

long sys32_uname(struct old_utsname __user * name)
{
	int err;
	if (!name)
		return -EFAULT;
	down_read(&uts_sem);
	err = copy_to_user(name, utsname(), sizeof (*name));
	up_read(&uts_sem);
	if (personality(current->personality) == PER_LINUX32) 
		err |= copy_to_user(&name->machine, "i686", 5);
	return err?-EFAULT:0;
}

long sys32_ustat(unsigned dev, struct ustat32 __user *u32p)
{
	struct ustat u;
	mm_segment_t seg;
	int ret;
	
	seg = get_fs(); 
	set_fs(KERNEL_DS); 
	ret = sys_ustat(dev, (struct ustat __user *)&u);
	set_fs(seg);
	if (ret >= 0) { 
		if (!access_ok(VERIFY_WRITE,u32p,sizeof(struct ustat32)) || 
		    __put_user((__u32) u.f_tfree, &u32p->f_tfree) ||
		    __put_user((__u32) u.f_tinode, &u32p->f_tfree) ||
		    __copy_to_user(&u32p->f_fname, u.f_fname, sizeof(u.f_fname)) ||
		    __copy_to_user(&u32p->f_fpack, u.f_fpack, sizeof(u.f_fpack)))
			ret = -EFAULT;
	}
	return ret;
} 

asmlinkage long sys32_execve(char __user *name, compat_uptr_t __user *argv,
			     compat_uptr_t __user *envp, struct pt_regs *regs)
{
	long error;
	char * filename;

	filename = getname(name);
	error = PTR_ERR(filename);
	if (IS_ERR(filename))
		return error;
	error = compat_do_execve(filename, argv, envp, regs);
	if (error == 0) {
		task_lock(current);
		current->ptrace &= ~PT_DTRACE;
		task_unlock(current);
	}
	putname(filename);
	return error;
}

asmlinkage long sys32_clone(unsigned int clone_flags, unsigned int newsp,
			    struct pt_regs *regs)
{
	void __user *parent_tid = (void __user *)regs->rdx;
	void __user *child_tid = (void __user *)regs->rdi;
	if (!newsp)
		newsp = regs->rsp;
        return do_fork(clone_flags, newsp, regs, 0, parent_tid, child_tid);
}

/*
 * Some system calls that need sign extended arguments. This could be done by a generic wrapper.
 */ 

long sys32_lseek (unsigned int fd, int offset, unsigned int whence)
{
	return sys_lseek(fd, offset, whence);
}

long sys32_kill(int pid, int sig)
{
	return sys_kill(pid, sig);
}
 
long sys32_fadvise64_64(int fd, __u32 offset_low, __u32 offset_high, 
			__u32 len_low, __u32 len_high, int advice)
{ 
	return sys_fadvise64_64(fd,
			       (((u64)offset_high)<<32) | offset_low,
			       (((u64)len_high)<<32) | len_low,
			       advice); 
} 

long sys32_vm86_warning(void)
{ 
	struct task_struct *me = current;
	static char lastcomm[sizeof(me->comm)];
	if (strncmp(lastcomm, me->comm, sizeof(lastcomm))) {
		compat_printk(KERN_INFO "%s: vm86 mode not supported on 64 bit kernel\n",
		       me->comm);
		strncpy(lastcomm, me->comm, sizeof(lastcomm));
	} 
	return -ENOSYS;
} 

long sys32_lookup_dcookie(u32 addr_low, u32 addr_high,
			  char __user * buf, size_t len)
{
	return sys_lookup_dcookie(((u64)addr_high << 32) | addr_low, buf, len);
}

asmlinkage ssize_t sys32_readahead(int fd, unsigned off_lo, unsigned off_hi, size_t count)
{
	return sys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
}

asmlinkage long sys32_sync_file_range(int fd, unsigned off_low, unsigned off_hi,
			   unsigned n_low, unsigned n_hi,  int flags)
{
	return sys_sync_file_range(fd,
				   ((u64)off_hi << 32) | off_low,
				   ((u64)n_hi << 32) | n_low, flags);
}

asmlinkage long sys32_fadvise64(int fd, unsigned offset_lo, unsigned offset_hi, size_t len,
		     int advice)
{
	return sys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
				len, advice);
}

asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_lo,
				unsigned offset_hi, unsigned len_lo,
				unsigned len_hi)
{
	return sys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
			     ((u64)len_hi << 32) | len_lo);
}