osf_sys.c

linux-2.6.15.6

	len = namelen;
	if (namelen > 32)
		len = 32;

	down_read(&uts_sem);
	for (i = 0; i < len; ++i) {
		__put_user(system_utsname.domainname[i], name + i);
		if (system_utsname.domainname[i] == '\0')
			break;
	}
	up_read(&uts_sem);

	return 0;
}

/*
 * The following stuff should move into a header file should it ever
 * be labeled "officially supported."  Right now, there is just enough
 * support to avoid applications (such as tar) printing error
 * messages.  The attributes are not really implemented.
 */

/*
 * Values for Property list entry flag
 */
#define PLE_PROPAGATE_ON_COPY		0x1	/* cp(1) will copy entry
						   by default */
#define PLE_FLAG_MASK			0x1	/* Valid flag values */
#define PLE_FLAG_ALL			-1	/* All flag value */

struct proplistname_args {
	unsigned int pl_mask;
	unsigned int pl_numnames;
	char **pl_names;
};

union pl_args {
	struct setargs {
		char __user *path;
		long follow;
		long nbytes;
		char __user *buf;
	} set;
	struct fsetargs {
		long fd;
		long nbytes;
		char __user *buf;
	} fset;
	struct getargs {
		char __user *path;
		long follow;
		struct proplistname_args __user *name_args;
		long nbytes;
		char __user *buf;
		int __user *min_buf_size;
	} get;
	struct fgetargs {
		long fd;
		struct proplistname_args __user *name_args;
		long nbytes;
		char __user *buf;
		int __user *min_buf_size;
	} fget;
	struct delargs {
		char __user *path;
		long follow;
		struct proplistname_args __user *name_args;
	} del;
	struct fdelargs {
		long fd;
		struct proplistname_args __user *name_args;
	} fdel;
};

enum pl_code {
	PL_SET = 1, PL_FSET = 2,
	PL_GET = 3, PL_FGET = 4,
	PL_DEL = 5, PL_FDEL = 6
};

asmlinkage long
osf_proplist_syscall(enum pl_code code, union pl_args __user *args)
{
	long error;
	int __user *min_buf_size_ptr;

	lock_kernel();
	switch (code) {
	case PL_SET:
		if (get_user(error, &args->set.nbytes))
			error = -EFAULT;
		break;
	case PL_FSET:
		if (get_user(error, &args->fset.nbytes))
			error = -EFAULT;
		break;
	case PL_GET:
		error = get_user(min_buf_size_ptr, &args->get.min_buf_size);
		if (error)
			break;
		error = put_user(0, min_buf_size_ptr);
		break;
	case PL_FGET:
		error = get_user(min_buf_size_ptr, &args->fget.min_buf_size);
		if (error)
			break;
		error = put_user(0, min_buf_size_ptr);
		break;
	case PL_DEL:
	case PL_FDEL:
		error = 0;
		break;
	default:
		error = -EOPNOTSUPP;
		break;
	};
	unlock_kernel();
	return error;
}

asmlinkage int
osf_sigstack(struct sigstack __user *uss, struct sigstack __user *uoss)
{
	unsigned long usp = rdusp();
	unsigned long oss_sp = current->sas_ss_sp + current->sas_ss_size;
	unsigned long oss_os = on_sig_stack(usp);
	int error;

	if (uss) {
		void __user *ss_sp;

		error = -EFAULT;
		if (get_user(ss_sp, &uss->ss_sp))
			goto out;

		/* If the current stack was set with sigaltstack, don't
		   swap stacks while we are on it.  */
		error = -EPERM;
		if (current->sas_ss_sp && on_sig_stack(usp))
			goto out;

		/* Since we don't know the extent of the stack, and we don't
		   track onstack-ness, but rather calculate it, we must 
		   presume a size.  Ho hum this interface is lossy.  */
		current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
		current->sas_ss_size = SIGSTKSZ;
	}

	if (uoss) {
		error = -EFAULT;
		if (! access_ok(VERIFY_WRITE, uoss, sizeof(*uoss))
		    || __put_user(oss_sp, &uoss->ss_sp)
		    || __put_user(oss_os, &uoss->ss_onstack))
			goto out;
	}

	error = 0;
 out:
	return error;
}

asmlinkage long
osf_sysinfo(int command, char __user *buf, long count)
{
	static char * sysinfo_table[] = {
		system_utsname.sysname,
		system_utsname.nodename,
		system_utsname.release,
		system_utsname.version,
		system_utsname.machine,
		"alpha",	/* instruction set architecture */
		"dummy",	/* hardware serial number */
		"dummy",	/* hardware manufacturer */
		"dummy",	/* secure RPC domain */
	};
	unsigned long offset;
	char *res;
	long len, err = -EINVAL;

	offset = command-1;
	if (offset >= sizeof(sysinfo_table)/sizeof(char *)) {
		/* Digital UNIX has a few unpublished interfaces here */
		printk("sysinfo(%d)", command);
		goto out;
	}
	
	down_read(&uts_sem);
	res = sysinfo_table[offset];
	len = strlen(res)+1;
	if (len > count)
		len = count;
	if (copy_to_user(buf, res, len))
		err = -EFAULT;
	else
		err = 0;
	up_read(&uts_sem);
 out:
	return err;
}

asmlinkage unsigned long
osf_getsysinfo(unsigned long op, void __user *buffer, unsigned long nbytes,
	       int __user *start, void __user *arg)
{
	unsigned long w;
	struct percpu_struct *cpu;

	switch (op) {
	case GSI_IEEE_FP_CONTROL:
		/* Return current software fp control & status bits.  */
		/* Note that DU doesn't verify available space here.  */

 		w = current_thread_info()->ieee_state & IEEE_SW_MASK;
 		w = swcr_update_status(w, rdfpcr());
		if (put_user(w, (unsigned long __user *) buffer))
			return -EFAULT;
		return 0;

	case GSI_IEEE_STATE_AT_SIGNAL:
		/*
		 * Not sure anybody will ever use this weird stuff.  These
		 * ops can be used (under OSF/1) to set the fpcr that should
		 * be used when a signal handler starts executing.
		 */
		break;

 	case GSI_UACPROC:
		if (nbytes < sizeof(unsigned int))
			return -EINVAL;
 		w = (current_thread_info()->flags >> UAC_SHIFT) & UAC_BITMASK;
 		if (put_user(w, (unsigned int __user *)buffer))
 			return -EFAULT;
 		return 1;

	case GSI_PROC_TYPE:
		if (nbytes < sizeof(unsigned long))
			return -EINVAL;
		cpu = (struct percpu_struct*)
		  ((char*)hwrpb + hwrpb->processor_offset);
		w = cpu->type;
		if (put_user(w, (unsigned long  __user*)buffer))
			return -EFAULT;
		return 1;

	case GSI_GET_HWRPB:
		if (nbytes < sizeof(*hwrpb))
			return -EINVAL;
		if (copy_to_user(buffer, hwrpb, nbytes) != 0)
			return -EFAULT;
		return 1;

	default:
		break;
	}

	return -EOPNOTSUPP;
}

asmlinkage unsigned long
osf_setsysinfo(unsigned long op, void __user *buffer, unsigned long nbytes,
	       int __user *start, void __user *arg)
{
	switch (op) {
	case SSI_IEEE_FP_CONTROL: {
		unsigned long swcr, fpcr;
		unsigned int *state;

		/* 
		 * Alpha Architecture Handbook 4.7.7.3:
		 * To be fully IEEE compiant, we must track the current IEEE
		 * exception state in software, because spurrious bits can be
		 * set in the trap shadow of a software-complete insn.
		 */

		if (get_user(swcr, (unsigned long __user *)buffer))
			return -EFAULT;
		state = &current_thread_info()->ieee_state;

		/* Update softare trap enable bits.  */
		*state = (*state & ~IEEE_SW_MASK) | (swcr & IEEE_SW_MASK);

		/* Update the real fpcr.  */
		fpcr = rdfpcr() & FPCR_DYN_MASK;
		fpcr |= ieee_swcr_to_fpcr(swcr);
		wrfpcr(fpcr);

		return 0;
	}

	case SSI_IEEE_RAISE_EXCEPTION: {
		unsigned long exc, swcr, fpcr, fex;
		unsigned int *state;

		if (get_user(exc, (unsigned long __user *)buffer))
			return -EFAULT;
		state = &current_thread_info()->ieee_state;
		exc &= IEEE_STATUS_MASK;

		/* Update softare trap enable bits.  */
 		swcr = (*state & IEEE_SW_MASK) | exc;
		*state |= exc;

		/* Update the real fpcr.  */
		fpcr = rdfpcr();
		fpcr |= ieee_swcr_to_fpcr(swcr);
		wrfpcr(fpcr);

 		/* If any exceptions set by this call, and are unmasked,
		   send a signal.  Old exceptions are not signaled.  */
		fex = (exc >> IEEE_STATUS_TO_EXCSUM_SHIFT) & swcr;
 		if (fex) {
			siginfo_t info;
			int si_code = 0;

			if (fex & IEEE_TRAP_ENABLE_DNO) si_code = FPE_FLTUND;
			if (fex & IEEE_TRAP_ENABLE_INE) si_code = FPE_FLTRES;
			if (fex & IEEE_TRAP_ENABLE_UNF) si_code = FPE_FLTUND;
			if (fex & IEEE_TRAP_ENABLE_OVF) si_code = FPE_FLTOVF;
			if (fex & IEEE_TRAP_ENABLE_DZE) si_code = FPE_FLTDIV;
			if (fex & IEEE_TRAP_ENABLE_INV) si_code = FPE_FLTINV;

			info.si_signo = SIGFPE;
			info.si_errno = 0;
			info.si_code = si_code;
			info.si_addr = NULL;  /* FIXME */
 			send_sig_info(SIGFPE, &info, current);
 		}
		return 0;
	}

	case SSI_IEEE_STATE_AT_SIGNAL:
	case SSI_IEEE_IGNORE_STATE_AT_SIGNAL:
		/*
		 * Not sure anybody will ever use this weird stuff.  These
		 * ops can be used (under OSF/1) to set the fpcr that should
		 * be used when a signal handler starts executing.
		 */
		break;

 	case SSI_NVPAIRS: {
		unsigned long v, w, i;
		unsigned int old, new;
		
 		for (i = 0; i < nbytes; ++i) {

 			if (get_user(v, 2*i + (unsigned int __user *)buffer))
 				return -EFAULT;
 			if (get_user(w, 2*i + 1 + (unsigned int __user *)buffer))
 				return -EFAULT;
 			switch (v) {
 			case SSIN_UACPROC:
			again:
				old = current_thread_info()->flags;
				new = old & ~(UAC_BITMASK << UAC_SHIFT);
				new = new | (w & UAC_BITMASK) << UAC_SHIFT;
				if (cmpxchg(&current_thread_info()->flags,
					    old, new) != old)
					goto again;
 				break;
 
 			default:
 				return -EOPNOTSUPP;
 			}
 		}
 		return 0;
	}
 
	default:
		break;
	}

	return -EOPNOTSUPP;
}

/* Translations due to the fact that OSF's time_t is an int.  Which
   affects all sorts of things, like timeval and itimerval.  */

extern struct timezone sys_tz;
extern int do_adjtimex(struct timex *);

struct timeval32
{
    int tv_sec, tv_usec;
};

struct itimerval32
{
    struct timeval32 it_interval;
    struct timeval32 it_value;
};

static inline long
get_tv32(struct timeval *o, struct timeval32 __user *i)
{
	return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
		(__get_user(o->tv_sec, &i->tv_sec) |
		 __get_user(o->tv_usec, &i->tv_usec)));
}

static inline long
put_tv32(struct timeval32 __user *o, struct timeval *i)
{
	return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
		(__put_user(i->tv_sec, &o->tv_sec) |
		 __put_user(i->tv_usec, &o->tv_usec)));
}

static inline long
get_it32(struct itimerval *o, struct itimerval32 __user *i)
{
	return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
		(__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
		 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
		 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
		 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
}

static inline long
put_it32(struct itimerval32 __user *o, struct itimerval *i)
{
	return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
		(__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
		 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
		 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
		 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
}

static inline void
jiffies_to_timeval32(unsigned long jiffies, struct timeval32 *value)
{
	value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
	value->tv_sec = jiffies / HZ;
}

asmlinkage int
osf_gettimeofday(struct timeval32 __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)))