static unsigned long __peek_user(struct task_struct *child, addr_t addr)
{
	struct user *dummy = NULL;
	addr_t offset, tmp;

	if (addr < (addr_t) &dummy->regs.acrs) {
		/*
		 * psw and gprs are stored on the stack
		 */
		tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
		if (addr == (addr_t) &dummy->regs.psw.mask) {
			/* Return a clean psw mask. */
			tmp &= PSW_MASK_USER | PSW_MASK_RI;
			tmp |= PSW_USER_BITS;
		}

	} else if (addr < (addr_t) &dummy->regs.orig_gpr2) {
		/*
		 * access registers are stored in the thread structure
		 */
		offset = addr - (addr_t) &dummy->regs.acrs;
#ifdef CONFIG_64BIT
		/*
		 * Very special case: old & broken 64 bit gdb reading
		 * from acrs[15]. Result is a 64 bit value. Read the
		 * 32 bit acrs[15] value and shift it by 32. Sick...
		 */
		if (addr == (addr_t) &dummy->regs.acrs[15])
			tmp = ((unsigned long) child->thread.acrs[15]) << 32;
		else
#endif
		tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);

	} else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
		/*
		 * orig_gpr2 is stored on the kernel stack
		 */
		tmp = (addr_t) task_pt_regs(child)->orig_gpr2;

	} else if (addr < (addr_t) &dummy->regs.fp_regs) {
		/*
		 * prevent reads of padding hole between
		 * orig_gpr2 and fp_regs on s390.
		 */
		tmp = 0;

	} else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
		/* 
		 * floating point regs. are stored in the thread structure
		 */
		offset = addr - (addr_t) &dummy->regs.fp_regs;
		tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset);
		if (addr == (addr_t) &dummy->regs.fp_regs.fpc)
			tmp <<= BITS_PER_LONG - 32;

	} else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
		/*
		 * Handle access to the per_info structure.
		 */
		addr -= (addr_t) &dummy->regs.per_info;
		tmp = __peek_user_per(child, addr);

	} else
		tmp = 0;

	return tmp;
}
static unsigned long __peek_user(struct task_struct *child, addr_t addr)
{
	struct user *dummy = NULL;
	addr_t offset, tmp;

	if (addr < (addr_t) &dummy->regs.acrs) {
		 
		tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
		if (addr == (addr_t) &dummy->regs.psw.mask) {
			 
			tmp &= PSW_MASK_USER | PSW_MASK_RI;
			tmp |= PSW_USER_BITS;
		}

	} else if (addr < (addr_t) &dummy->regs.orig_gpr2) {
		 
		offset = addr - (addr_t) &dummy->regs.acrs;
#ifdef CONFIG_64BIT
		 
		if (addr == (addr_t) &dummy->regs.acrs[15])
			tmp = ((unsigned long) child->thread.acrs[15]) << 32;
		else
#endif
		tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);

	} else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
		 
		tmp = (addr_t) task_pt_regs(child)->orig_gpr2;

	} else if (addr < (addr_t) &dummy->regs.fp_regs) {
		 
		tmp = 0;

	} else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
		 
		offset = addr - (addr_t) &dummy->regs.fp_regs;
		tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset);
		if (addr == (addr_t) &dummy->regs.fp_regs.fpc)
			tmp <<= BITS_PER_LONG - 32;

	} else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
		 
		addr -= (addr_t) &dummy->regs.per_info;
		tmp = __peek_user_per(child, addr);

	} else
		tmp = 0;

	return tmp;
}