[deliverable/linux.git] / arch / s390 / lib / uaccess_std.c

/*
 *  arch/s390/lib/uaccess_std.c
 *
 *  Standard user space access functions based on mvcp/mvcs and doing
 *  interesting things in the secondary space mode.
 *
 *    Copyright (C) IBM Corp. 2006
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
 *		 Gerald Schaefer (gerald.schaefer@de.ibm.com)
 */

#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/uaccess.h>
#include <asm/futex.h>
#include "uaccess.h"

#ifndef __s390x__
#define AHI	"ahi"
#define ALR	"alr"
#define CLR	"clr"
#define LHI	"lhi"
#define SLR	"slr"
#else
#define AHI	"aghi"
#define ALR	"algr"
#define CLR	"clgr"
#define LHI	"lghi"
#define SLR	"slgr"
#endif

size_t copy_from_user_std(size_t size, const void __user *ptr, void *x)
{
	unsigned long tmp1, tmp2;

	tmp1 = -256UL;
	asm volatile(
		"0: mvcp  0(%0,%2),0(%1),%3\n"
		"   jz    8f\n"
		"1:"ALR"  %0,%3\n"
		"   la    %1,256(%1)\n"
		"   la    %2,256(%2)\n"
		"2: mvcp  0(%0,%2),0(%1),%3\n"
		"   jnz   1b\n"
		"   j     8f\n"
		"3: la    %4,255(%1)\n"	/* %4 = ptr + 255 */
		"  "LHI"  %3,-4096\n"
		"   nr    %4,%3\n"	/* %4 = (ptr + 255) & -4096 */
		"  "SLR"  %4,%1\n"
		"  "CLR"  %0,%4\n"	/* copy crosses next page boundary? */
		"   jnh   5f\n"
		"4: mvcp  0(%4,%2),0(%1),%3\n"
		"  "SLR"  %0,%4\n"
		"  "ALR"  %2,%4\n"
		"5:"LHI"  %4,-1\n"
		"  "ALR"  %4,%0\n"	/* copy remaining size, subtract 1 */
		"   bras  %3,7f\n"	/* memset loop */
		"   xc    0(1,%2),0(%2)\n"
		"6: xc    0(256,%2),0(%2)\n"
		"   la    %2,256(%2)\n"
		"7:"AHI"  %4,-256\n"
		"   jnm   6b\n"
		"   ex    %4,0(%3)\n"
		"   j     9f\n"
		"8:"SLR"  %0,%0\n"
		"9: \n"
		EX_TABLE(0b,3b) EX_TABLE(2b,3b) EX_TABLE(4b,5b)
		: "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
		: : "cc", "memory");
	return size;
}

static size_t copy_from_user_std_check(size_t size, const void __user *ptr,
				       void *x)
{
	if (size <= 1024)
		return copy_from_user_std(size, ptr, x);
	return copy_from_user_pt(size, ptr, x);
}

size_t copy_to_user_std(size_t size, void __user *ptr, const void *x)
{
	unsigned long tmp1, tmp2;

	tmp1 = -256UL;
	asm volatile(
		"0: mvcs  0(%0,%1),0(%2),%3\n"
		"   jz    5f\n"
		"1:"ALR"  %0,%3\n"
		"   la    %1,256(%1)\n"
		"   la    %2,256(%2)\n"
		"2: mvcs  0(%0,%1),0(%2),%3\n"
		"   jnz   1b\n"
		"   j     5f\n"
		"3: la    %4,255(%1)\n" /* %4 = ptr + 255 */
		"  "LHI"  %3,-4096\n"
		"   nr    %4,%3\n"	/* %4 = (ptr + 255) & -4096 */
		"  "SLR"  %4,%1\n"
		"  "CLR"  %0,%4\n"	/* copy crosses next page boundary? */
		"   jnh   6f\n"
		"4: mvcs  0(%4,%1),0(%2),%3\n"
		"  "SLR"  %0,%4\n"
		"   j     6f\n"
		"5:"SLR"  %0,%0\n"
		"6: \n"
		EX_TABLE(0b,3b) EX_TABLE(2b,3b) EX_TABLE(4b,6b)
		: "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
		: : "cc", "memory");
	return size;
}

static size_t copy_to_user_std_check(size_t size, void __user *ptr,
				     const void *x)
{
	if (size <= 1024)
		return copy_to_user_std(size, ptr, x);
	return copy_to_user_pt(size, ptr, x);
}

static size_t copy_in_user_std(size_t size, void __user *to,
			       const void __user *from)
{
	unsigned long tmp1;

	asm volatile(
		"  "AHI"  %0,-1\n"
		"   jo    5f\n"
		"   sacf  256\n"
		"   bras  %3,3f\n"
		"0:"AHI"  %0,257\n"
		"1: mvc   0(1,%1),0(%2)\n"
		"   la    %1,1(%1)\n"
		"   la    %2,1(%2)\n"
		"  "AHI"  %0,-1\n"
		"   jnz   1b\n"
		"   j     5f\n"
		"2: mvc   0(256,%1),0(%2)\n"
		"   la    %1,256(%1)\n"
		"   la    %2,256(%2)\n"
		"3:"AHI"  %0,-256\n"
		"   jnm   2b\n"
		"4: ex    %0,1b-0b(%3)\n"
		"   sacf  0\n"
		"5: "SLR"  %0,%0\n"
		"6:\n"
		EX_TABLE(1b,6b) EX_TABLE(2b,0b) EX_TABLE(4b,0b)
		: "+a" (size), "+a" (to), "+a" (from), "=a" (tmp1)
		: : "cc", "memory");
	return size;
}

static size_t clear_user_std(size_t size, void __user *to)
{
	unsigned long tmp1, tmp2;

	asm volatile(
		"  "AHI"  %0,-1\n"
		"   jo    5f\n"
		"   sacf  256\n"
		"   bras  %3,3f\n"
		"   xc    0(1,%1),0(%1)\n"
		"0:"AHI"  %0,257\n"
		"   la    %2,255(%1)\n" /* %2 = ptr + 255 */
		"   srl   %2,12\n"
		"   sll   %2,12\n"	/* %2 = (ptr + 255) & -4096 */
		"  "SLR"  %2,%1\n"
		"  "CLR"  %0,%2\n"	/* clear crosses next page boundary? */
		"   jnh   5f\n"
		"  "AHI"  %2,-1\n"
		"1: ex    %2,0(%3)\n"
		"  "AHI"  %2,1\n"
		"  "SLR"  %0,%2\n"
		"   j     5f\n"
		"2: xc    0(256,%1),0(%1)\n"
		"   la    %1,256(%1)\n"
		"3:"AHI"  %0,-256\n"
		"   jnm   2b\n"
		"4: ex    %0,0(%3)\n"
		"   sacf  0\n"
		"5: "SLR"  %0,%0\n"
		"6:\n"
		EX_TABLE(1b,6b) EX_TABLE(2b,0b) EX_TABLE(4b,0b)
		: "+a" (size), "+a" (to), "=a" (tmp1), "=a" (tmp2)
		: : "cc", "memory");
	return size;
}

size_t strnlen_user_std(size_t size, const char __user *src)
{
	register unsigned long reg0 asm("0") = 0UL;
	unsigned long tmp1, tmp2;

	asm volatile(
		"   la    %2,0(%1)\n"
		"   la    %3,0(%0,%1)\n"
		"  "SLR"  %0,%0\n"
		"   sacf  256\n"
		"0: srst  %3,%2\n"
		"   jo    0b\n"
		"   la    %0,1(%3)\n"	/* strnlen_user results includes \0 */
		"  "SLR"  %0,%1\n"
		"1: sacf  0\n"
		EX_TABLE(0b,1b)
		: "+a" (size), "+a" (src), "=a" (tmp1), "=a" (tmp2)
		: "d" (reg0) : "cc", "memory");
	return size;
}

size_t strncpy_from_user_std(size_t size, const char __user *src, char *dst)
{
	register unsigned long reg0 asm("0") = 0UL;
	unsigned long tmp1, tmp2;

	asm volatile(
		"   la    %3,0(%1)\n"
		"   la    %4,0(%0,%1)\n"
		"   sacf  256\n"
		"0: srst  %4,%3\n"
		"   jo    0b\n"
		"   sacf  0\n"
		"   la    %0,0(%4)\n"
		"   jh    1f\n"		/* found \0 in string ? */
		"  "AHI"  %4,1\n"	/* include \0 in copy */
		"1:"SLR"  %0,%1\n"	/* %0 = return length (without \0) */
		"  "SLR"  %4,%1\n"	/* %4 = copy length (including \0) */
		"2: mvcp  0(%4,%2),0(%1),%5\n"
		"   jz    9f\n"
		"3:"AHI"  %4,-256\n"
		"   la    %1,256(%1)\n"
		"   la    %2,256(%2)\n"
		"4: mvcp  0(%4,%2),0(%1),%5\n"
		"   jnz   3b\n"
		"   j     9f\n"
		"7: sacf  0\n"
		"8:"LHI"  %0,%6\n"
		"9:\n"
		EX_TABLE(0b,7b) EX_TABLE(2b,8b) EX_TABLE(4b,8b)
		: "+a" (size), "+a" (src), "+d" (dst), "=a" (tmp1), "=a" (tmp2)
		: "d" (reg0), "K" (-EFAULT) : "cc", "memory");
	return size;
}

#define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg)	\
	asm volatile(							\
		"   sacf  256\n"					\
		"0: l     %1,0(%6)\n"					\
		"1:"insn						\
		"2: cs    %1,%2,0(%6)\n"				\
		"3: jl    1b\n"						\
		"   lhi   %0,0\n"					\
		"4: sacf  0\n"						\
		EX_TABLE(0b,4b) EX_TABLE(2b,4b) EX_TABLE(3b,4b)		\
		: "=d" (ret), "=&d" (oldval), "=&d" (newval),		\
		  "=m" (*uaddr)						\
		: "0" (-EFAULT), "d" (oparg), "a" (uaddr),		\
		  "m" (*uaddr) : "cc");

int futex_atomic_op_std(int op, int __user *uaddr, int oparg, int *old)
{
	int oldval = 0, newval, ret;

	switch (op) {
	case FUTEX_OP_SET:
		__futex_atomic_op("lr %2,%5\n",
				  ret, oldval, newval, uaddr, oparg);
		break;
	case FUTEX_OP_ADD:
		__futex_atomic_op("lr %2,%1\nar %2,%5\n",
				  ret, oldval, newval, uaddr, oparg);
		break;
	case FUTEX_OP_OR:
		__futex_atomic_op("lr %2,%1\nor %2,%5\n",
				  ret, oldval, newval, uaddr, oparg);
		break;
	case FUTEX_OP_ANDN:
		__futex_atomic_op("lr %2,%1\nnr %2,%5\n",
				  ret, oldval, newval, uaddr, oparg);
		break;
	case FUTEX_OP_XOR:
		__futex_atomic_op("lr %2,%1\nxr %2,%5\n",
				  ret, oldval, newval, uaddr, oparg);
		break;
	default:
		ret = -ENOSYS;
	}
	*old = oldval;
	return ret;
}

int futex_atomic_cmpxchg_std(int __user *uaddr, int oldval, int newval)
{
	int ret;

	asm volatile(
		"   sacf 256\n"
		"0: cs   %1,%4,0(%5)\n"
		"1: lr   %0,%1\n"
		"2: sacf 0\n"
		EX_TABLE(0b,2b) EX_TABLE(1b,2b)
		: "=d" (ret), "+d" (oldval), "=m" (*uaddr)
		: "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
		: "cc", "memory" );
	return ret;
}

struct uaccess_ops uaccess_std = {
	.copy_from_user = copy_from_user_std_check,
	.copy_from_user_small = copy_from_user_std,
	.copy_to_user = copy_to_user_std_check,
	.copy_to_user_small = copy_to_user_std,
	.copy_in_user = copy_in_user_std,
	.clear_user = clear_user_std,
	.strnlen_user = strnlen_user_std,
	.strncpy_from_user = strncpy_from_user_std,
	.futex_atomic_op = futex_atomic_op_std,
	.futex_atomic_cmpxchg = futex_atomic_cmpxchg_std,
};
Commit	Line	Data
d02765d1 GS	1	/*
	2	* arch/s390/lib/uaccess_std.c
	3	*
	4	* Standard user space access functions based on mvcp/mvcs and doing
	5	* interesting things in the secondary space mode.
	6	*
	7	* Copyright (C) IBM Corp. 2006
	8	* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
	9	* Gerald Schaefer (gerald.schaefer@de.ibm.com)
	10	*/
	11
	12	#include <linux/errno.h>
	13	#include <linux/mm.h>
a866374a	14	#include <linux/uaccess.h>
d02765d1	15	#include <asm/futex.h>
2b67fc46	16	#include "uaccess.h"
d02765d1 GS	17
	18	#ifndef __s390x__
	19	#define AHI "ahi"
	20	#define ALR "alr"
	21	#define CLR "clr"
	22	#define LHI "lhi"
	23	#define SLR "slr"
	24	#else
	25	#define AHI "aghi"
	26	#define ALR "algr"
	27	#define CLR "clgr"
	28	#define LHI "lghi"
	29	#define SLR "slgr"
	30	#endif
	31
	32	size_t copy_from_user_std(size_t size, const void __user ptr, void x)
	33	{
	34	unsigned long tmp1, tmp2;
	35
	36	tmp1 = -256UL;
	37	asm volatile(
	38	"0: mvcp 0(%0,%2),0(%1),%3\n"
52149ba6	39	" jz 8f\n"
d02765d1 GS	40	"1:"ALR" %0,%3\n"
	41	" la %1,256(%1)\n"
	42	" la %2,256(%2)\n"
	43	"2: mvcp 0(%0,%2),0(%1),%3\n"
	44	" jnz 1b\n"
52149ba6	45	" j 8f\n"
d02765d1 GS	46	"3: la %4,255(%1)\n" /* %4 = ptr + 255 */
	47	" "LHI" %3,-4096\n"
	48	" nr %4,%3\n" /* %4 = (ptr + 255) & -4096 */
	49	" "SLR" %4,%1\n"
	50	" "CLR" %0,%4\n" /* copy crosses next page boundary? */
52149ba6	51	" jnh 5f\n"
d02765d1 GS	52	"4: mvcp 0(%4,%2),0(%1),%3\n"
d02765d1 GS	53	" "SLR" %0,%4\n"
52149ba6 MS	54	" "ALR" %2,%4\n"
	55	"5:"LHI" %4,-1\n"
	56	" "ALR" %4,%0\n" /* copy remaining size, subtract 1 */
	57	" bras %3,7f\n" /* memset loop */
	58	" xc 0(1,%2),0(%2)\n"
	59	"6: xc 0(256,%2),0(%2)\n"
	60	" la %2,256(%2)\n"
	61	"7:"AHI" %4,-256\n"
	62	" jnm 6b\n"
	63	" ex %4,0(%3)\n"
	64	" j 9f\n"
	65	"8:"SLR" %0,%0\n"
	66	"9: \n"
	67	EX_TABLE(0b,3b) EX_TABLE(2b,3b) EX_TABLE(4b,5b)
d02765d1 GS	68	: "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
	69	: : "cc", "memory");
	70	return size;
	71	}
	72
2b67fc46 HC	73	static size_t copy_from_user_std_check(size_t size, const void __user *ptr,
2b67fc46 HC	74	void *x)
d02765d1	75	{
59f35d53 GS	76	if (size <= 1024)
	77	return copy_from_user_std(size, ptr, x);
	78	return copy_from_user_pt(size, ptr, x);
d02765d1 GS	79	}
	80
	81	size_t copy_to_user_std(size_t size, void __user ptr, const void x)
	82	{
	83	unsigned long tmp1, tmp2;
	84
	85	tmp1 = -256UL;
	86	asm volatile(
	87	"0: mvcs 0(%0,%1),0(%2),%3\n"
	88	" jz 5f\n"
	89	"1:"ALR" %0,%3\n"
	90	" la %1,256(%1)\n"
	91	" la %2,256(%2)\n"
	92	"2: mvcs 0(%0,%1),0(%2),%3\n"
	93	" jnz 1b\n"
	94	" j 5f\n"
	95	"3: la %4,255(%1)\n" /* %4 = ptr + 255 */
	96	" "LHI" %3,-4096\n"
	97	" nr %4,%3\n" /* %4 = (ptr + 255) & -4096 */
	98	" "SLR" %4,%1\n"
	99	" "CLR" %0,%4\n" /* copy crosses next page boundary? */
	100	" jnh 6f\n"
	101	"4: mvcs 0(%4,%1),0(%2),%3\n"
	102	" "SLR" %0,%4\n"
	103	" j 6f\n"
	104	"5:"SLR" %0,%0\n"
	105	"6: \n"
	106	EX_TABLE(0b,3b) EX_TABLE(2b,3b) EX_TABLE(4b,6b)
	107	: "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
	108	: : "cc", "memory");
	109	return size;
	110	}
	111
2b67fc46 HC	112	static size_t copy_to_user_std_check(size_t size, void __user *ptr,
2b67fc46 HC	113	const void *x)
d02765d1	114	{
59f35d53 GS	115	if (size <= 1024)
	116	return copy_to_user_std(size, ptr, x);
	117	return copy_to_user_pt(size, ptr, x);
d02765d1 GS	118	}
d02765d1 GS	119
2b67fc46 HC	120	static size_t copy_in_user_std(size_t size, void __user *to,
2b67fc46 HC	121	const void __user *from)
d02765d1 GS	122	{
	123	unsigned long tmp1;
	124
	125	asm volatile(
	126	" "AHI" %0,-1\n"
	127	" jo 5f\n"
	128	" sacf 256\n"
	129	" bras %3,3f\n"
	130	"0:"AHI" %0,257\n"
	131	"1: mvc 0(1,%1),0(%2)\n"
	132	" la %1,1(%1)\n"
	133	" la %2,1(%2)\n"
	134	" "AHI" %0,-1\n"
	135	" jnz 1b\n"
	136	" j 5f\n"
	137	"2: mvc 0(256,%1),0(%2)\n"
	138	" la %1,256(%1)\n"
	139	" la %2,256(%2)\n"
	140	"3:"AHI" %0,-256\n"
	141	" jnm 2b\n"
	142	"4: ex %0,1b-0b(%3)\n"
	143	" sacf 0\n"
	144	"5: "SLR" %0,%0\n"
	145	"6:\n"
	146	EX_TABLE(1b,6b) EX_TABLE(2b,0b) EX_TABLE(4b,0b)
	147	: "+a" (size), "+a" (to), "+a" (from), "=a" (tmp1)
	148	: : "cc", "memory");
	149	return size;
	150	}
	151
2b67fc46	152	static size_t clear_user_std(size_t size, void __user *to)
d02765d1 GS	153	{
	154	unsigned long tmp1, tmp2;
	155
	156	asm volatile(
	157	" "AHI" %0,-1\n"
	158	" jo 5f\n"
	159	" sacf 256\n"
	160	" bras %3,3f\n"
	161	" xc 0(1,%1),0(%1)\n"
	162	"0:"AHI" %0,257\n"
	163	" la %2,255(%1)\n" /* %2 = ptr + 255 */
	164	" srl %2,12\n"
	165	" sll %2,12\n" /* %2 = (ptr + 255) & -4096 */
	166	" "SLR" %2,%1\n"
	167	" "CLR" %0,%2\n" /* clear crosses next page boundary? */
	168	" jnh 5f\n"
	169	" "AHI" %2,-1\n"
	170	"1: ex %2,0(%3)\n"
	171	" "AHI" %2,1\n"
	172	" "SLR" %0,%2\n"
	173	" j 5f\n"
	174	"2: xc 0(256,%1),0(%1)\n"
	175	" la %1,256(%1)\n"
	176	"3:"AHI" %0,-256\n"
	177	" jnm 2b\n"
	178	"4: ex %0,0(%3)\n"
	179	" sacf 0\n"
	180	"5: "SLR" %0,%0\n"
	181	"6:\n"
	182	EX_TABLE(1b,6b) EX_TABLE(2b,0b) EX_TABLE(4b,0b)
	183	: "+a" (size), "+a" (to), "=a" (tmp1), "=a" (tmp2)
	184	: : "cc", "memory");
	185	return size;
	186	}
	187
	188	size_t strnlen_user_std(size_t size, const char __user *src)
	189	{
	190	register unsigned long reg0 asm("0") = 0UL;
	191	unsigned long tmp1, tmp2;
	192
	193	asm volatile(
	194	" la %2,0(%1)\n"
	195	" la %3,0(%0,%1)\n"
	196	" "SLR" %0,%0\n"
	197	" sacf 256\n"
	198	"0: srst %3,%2\n"
	199	" jo 0b\n"
	200	" la %0,1(%3)\n" /* strnlen_user results includes \0 */
	201	" "SLR" %0,%1\n"
	202	"1: sacf 0\n"
	203	EX_TABLE(0b,1b)
	204	: "+a" (size), "+a" (src), "=a" (tmp1), "=a" (tmp2)
	205	: "d" (reg0) : "cc", "memory");
	206	return size;
	207	}
	208
	209	size_t strncpy_from_user_std(size_t size, const char __user src, char dst)
	210	{
	211	register unsigned long reg0 asm("0") = 0UL;
	212	unsigned long tmp1, tmp2;
	213
	214	asm volatile(
	215	" la %3,0(%1)\n"
	216	" la %4,0(%0,%1)\n"
217	" sacf 256\n"
218	"0: srst %4,%3\n"
219	" jo 0b\n"
220	" sacf 0\n"
221	" la %0,0(%4)\n"
222	" jh 1f\n" /* found \0 in string ? */
223	" "AHI" %4,1\n" /* include \0 in copy */
224	"1:"SLR" %0,%1\n" /* %0 = return length (without \0) */
225	" "SLR" %4,%1\n" /* %4 = copy length (including \0) */
226	"2: mvcp 0(%4,%2),0(%1),%5\n"
227	" jz 9f\n"
228	"3:"AHI" %4,-256\n"
229	" la %1,256(%1)\n"
230	" la %2,256(%2)\n"
231	"4: mvcp 0(%4,%2),0(%1),%5\n"
232	" jnz 3b\n"
233	" j 9f\n"
234	"7: sacf 0\n"
235	"8:"LHI" %0,%6\n"
236	"9:\n"
237	EX_TABLE(0b,7b) EX_TABLE(2b,8b) EX_TABLE(4b,8b)
238	: "+a" (size), "+a" (src), "+d" (dst), "=a" (tmp1), "=a" (tmp2)
239	: "d" (reg0), "K" (-EFAULT) : "cc", "memory");
240	return size;
241	}
242
243	#define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \
244	asm volatile( \
245	" sacf 256\n" \
246	"0: l %1,0(%6)\n" \
247	"1:"insn \
248	"2: cs %1,%2,0(%6)\n" \
249	"3: jl 1b\n" \
250	" lhi %0,0\n" \
251	"4: sacf 0\n" \
252	EX_TABLE(0b,4b) EX_TABLE(2b,4b) EX_TABLE(3b,4b) \
253	: "=d" (ret), "=&d" (oldval), "=&d" (newval), \
254	"=m" (*uaddr) \
255	: "0" (-EFAULT), "d" (oparg), "a" (uaddr), \
256	"m" (*uaddr) : "cc");
257
2b67fc46	258	int futex_atomic_op_std(int op, int __user uaddr, int oparg, int old)
d02765d1 GS	259	{
	260	int oldval = 0, newval, ret;
	261
d02765d1 GS	262	switch (op) {
	263	case FUTEX_OP_SET:
	264	__futex_atomic_op("lr %2,%5\n",
	265	ret, oldval, newval, uaddr, oparg);
	266	break;
	267	case FUTEX_OP_ADD:
	268	__futex_atomic_op("lr %2,%1\nar %2,%5\n",
	269	ret, oldval, newval, uaddr, oparg);
	270	break;
	271	case FUTEX_OP_OR:
	272	__futex_atomic_op("lr %2,%1\nor %2,%5\n",
	273	ret, oldval, newval, uaddr, oparg);
	274	break;
	275	case FUTEX_OP_ANDN:
	276	__futex_atomic_op("lr %2,%1\nnr %2,%5\n",
	277	ret, oldval, newval, uaddr, oparg);
	278	break;
	279	case FUTEX_OP_XOR:
	280	__futex_atomic_op("lr %2,%1\nxr %2,%5\n",
	281	ret, oldval, newval, uaddr, oparg);
	282	break;
	283	default:
	284	ret = -ENOSYS;
	285	}
d02765d1 GS	286	*old = oldval;
	287	return ret;
	288	}
	289
2b67fc46	290	int futex_atomic_cmpxchg_std(int __user *uaddr, int oldval, int newval)
d02765d1 GS	291	{
	292	int ret;
	293
	294	asm volatile(
	295	" sacf 256\n"
d5b02b3f HC	296	"0: cs %1,%4,0(%5)\n"
	297	"1: lr %0,%1\n"
	298	"2: sacf 0\n"
	299	EX_TABLE(0b,2b) EX_TABLE(1b,2b)
d02765d1 GS	300	: "=d" (ret), "+d" (oldval), "=m" (*uaddr)
	301	: "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
	302	: "cc", "memory" );
	303	return ret;
	304	}
	305
	306	struct uaccess_ops uaccess_std = {
59f35d53 GS	307	.copy_from_user = copy_from_user_std_check,
	308	.copy_from_user_small = copy_from_user_std,
	309	.copy_to_user = copy_to_user_std_check,
	310	.copy_to_user_small = copy_to_user_std,
d02765d1 GS	311	.copy_in_user = copy_in_user_std,
	312	.clear_user = clear_user_std,
	313	.strnlen_user = strnlen_user_std,
	314	.strncpy_from_user = strncpy_from_user_std,
2b67fc46 HC	315	.futex_atomic_op = futex_atomic_op_std,
2b67fc46 HC	316	.futex_atomic_cmpxchg = futex_atomic_cmpxchg_std,
d02765d1	317	};