sh: Consolidate addr/access_ok across mmu/nommu on 32bit.

#define VERIFY_READ    0

#define VERIFY_WRITE   1

#if !defined(CONFIG_MMU)

/* NOMMU is always true */

#define __addr_ok(addr) (1)

/*

 * __access_ok: Check if address with size is OK or not.

 *

 * If we don't have an MMU (or if its disabled) the only thing we really have

 * to look out for is if the address resides somewhere outside of what

 * available RAM we have.

 */

static inline int __access_ok(unsigned long addr, unsigned long size)

{

	return 1;

}

#else /* CONFIG_MMU */

#define __addr_ok(addr) \

	((unsigned long)(addr) < (current_thread_info()->addr_limit.seg))

	((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)

/*

 * __access_ok: Check if address with size is OK or not.

 * sum := addr + size;  carry? --> flag = true;

 * if (sum >= addr_limit) flag = true;

 */

static inline int __access_ok(unsigned long addr, unsigned long size)

{

	unsigned long flag, sum;

	__asm__("clrt\n\t"

		"addc	%3, %1\n\t"

		"movt	%0\n\t"

		"cmp/hi	%4, %1\n\t"

		"rotcl	%0"

		:"=&r" (flag), "=r" (sum)

		:"1" (addr), "r" (size),

		 "r" (current_thread_info()->addr_limit.seg)

		:"t");

	return flag == 0;

}

#endif /* CONFIG_MMU */

#define __access_ok(addr, size)		\

	(__addr_ok((addr) + (size)))

#define access_ok(type, addr, size)	\

	(__chk_user_ptr(addr),		\

	 __access_ok((unsigned long __force)(addr), (size)))