[linux-2.6-block.git] / include / asm-sparc64 / futex.h

#ifndef _SPARC64_FUTEX_H
#define _SPARC64_FUTEX_H

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

#define __futex_cas_op(insn, ret, oldval, uaddr, oparg)	\
	__asm__ __volatile__(				\
	"\n1:	lduwa	[%3] %%asi, %2\n"		\
	"	" insn "\n"				\
	"2:	casa	[%3] %%asi, %2, %1\n"		\
	"	cmp	%2, %1\n"			\
	"	bne,pn	%%icc, 1b\n"			\
	"	 mov	0, %0\n"			\
	"3:\n"						\
	"	.section .fixup,#alloc,#execinstr\n"	\
	"	.align	4\n"				\
	"4:	ba	3b\n"				\
	"	 mov	%5, %0\n"			\
	"	.previous\n"				\
	"	.section __ex_table,\"a\"\n"		\
	"	.align	4\n"				\
	"	.word	1b, 4b\n"			\
	"	.word	2b, 4b\n"			\
	"	.previous\n"				\
	: "=&r" (ret), "=&r" (oldval), "=&r" (tem)	\
	: "r" (uaddr), "r" (oparg), "i" (-EFAULT)	\
	: "memory")

static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
{
	int op = (encoded_op >> 28) & 7;
	int cmp = (encoded_op >> 24) & 15;
	int oparg = (encoded_op << 8) >> 20;
	int cmparg = (encoded_op << 20) >> 20;
	int oldval = 0, ret, tem;

	if (unlikely(!access_ok(VERIFY_WRITE, uaddr, sizeof(int))))
		return -EFAULT;
	if (unlikely((((unsigned long) uaddr) & 0x3UL)))
		return -EINVAL;

	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
		oparg = 1 << oparg;

	inc_preempt_count();

	switch (op) {
	case FUTEX_OP_SET:
		__futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg);
		break;
	case FUTEX_OP_ADD:
		__futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg);
		break;
	case FUTEX_OP_OR:
		__futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg);
		break;
	case FUTEX_OP_ANDN:
		__futex_cas_op("and\t%2, %4, %1", ret, oldval, uaddr, oparg);
		break;
	case FUTEX_OP_XOR:
		__futex_cas_op("xor\t%2, %4, %1", ret, oldval, uaddr, oparg);
		break;
	default:
		ret = -ENOSYS;
	}

	dec_preempt_count();

	if (!ret) {
		switch (cmp) {
		case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
		case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
		case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
		case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
		case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
		case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
		default: ret = -ENOSYS;
		}
	}
	return ret;
}

static inline int
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
{
	__asm__ __volatile__(
	"\n1:	casa	[%3] %%asi, %2, %0\n"
	"2:\n"
	"	.section .fixup,#alloc,#execinstr\n"
	"	.align	4\n"
	"3:	ba	2b\n"
	"	 mov	%4, %0\n"
	"	.previous\n"
	"	.section __ex_table,\"a\"\n"
	"	.align	4\n"
	"	.word	1b, 3b\n"
	"	.previous\n"
	: "=r" (newval)
	: "0" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT)
	: "memory");

	return newval;
}

#endif /* !(_SPARC64_FUTEX_H) */
Commit	Line	Data
043df59e DM	1	#ifndef _SPARC64_FUTEX_H
043df59e DM	2	#define _SPARC64_FUTEX_H
4732efbe	3
043df59e DM	4	#include <linux/futex.h>
	5	#include <asm/errno.h>
	6	#include <asm/system.h>
	7	#include <asm/uaccess.h>
4732efbe	8
043df59e DM	9	#define __futex_cas_op(insn, ret, oldval, uaddr, oparg) \
	10	__asm__ __volatile__( \
	11	"\n1: lduwa [%3] %%asi, %2\n" \
	12	" " insn "\n" \
	13	"2: casa [%3] %%asi, %2, %1\n" \
	14	" cmp %2, %1\n" \
	15	" bne,pn %%icc, 1b\n" \
	16	" mov 0, %0\n" \
	17	"3:\n" \
	18	" .section .fixup,#alloc,#execinstr\n" \
	19	" .align 4\n" \
	20	"4: ba 3b\n" \
	21	" mov %5, %0\n" \
	22	" .previous\n" \
4d000d5b	23	" .section __ex_table,\"a\"\n" \
043df59e DM	24	" .align 4\n" \
	25	" .word 1b, 4b\n" \
	26	" .word 2b, 4b\n" \
	27	" .previous\n" \
	28	: "=&r" (ret), "=&r" (oldval), "=&r" (tem) \
	29	: "r" (uaddr), "r" (oparg), "i" (-EFAULT) \
	30	: "memory")
	31
	32	static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
	33	{
	34	int op = (encoded_op >> 28) & 7;
	35	int cmp = (encoded_op >> 24) & 15;
	36	int oparg = (encoded_op << 8) >> 20;
	37	int cmparg = (encoded_op << 20) >> 20;
	38	int oldval = 0, ret, tem;
	39
	40	if (unlikely(!access_ok(VERIFY_WRITE, uaddr, sizeof(int))))
	41	return -EFAULT;
	42	if (unlikely((((unsigned long) uaddr) & 0x3UL)))
	43	return -EINVAL;
	44
	45	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
	46	oparg = 1 << oparg;
	47
	48	inc_preempt_count();
	49
	50	switch (op) {
	51	case FUTEX_OP_SET:
	52	__futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg);
	53	break;
	54	case FUTEX_OP_ADD:
	55	__futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg);
	56	break;
	57	case FUTEX_OP_OR:
	58	__futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg);
	59	break;
	60	case FUTEX_OP_ANDN:
	61	__futex_cas_op("and\t%2, %4, %1", ret, oldval, uaddr, oparg);
	62	break;
	63	case FUTEX_OP_XOR:
	64	__futex_cas_op("xor\t%2, %4, %1", ret, oldval, uaddr, oparg);
	65	break;
	66	default:
	67	ret = -ENOSYS;
	68	}
	69
	70	dec_preempt_count();
	71
	72	if (!ret) {
	73	switch (cmp) {
	74	case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
	75	case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
	76	case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
	77	case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
	78	case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
	79	case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
	80	default: ret = -ENOSYS;
	81	}
	82	}
	83	return ret;
	84	}
	85
e9056f13	86	static inline int
6e57a3a8	87	futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
e9056f13	88	{
6e57a3a8	89	__asm__ __volatile__(
c7fed9d7 DM	90	"\n1: casa [%3] %%asi, %2, %0\n"
c7fed9d7 DM	91	"2:\n"
6e57a3a8 DM	92	" .section .fixup,#alloc,#execinstr\n"
6e57a3a8 DM	93	" .align 4\n"
c7fed9d7 DM	94	"3: ba 2b\n"
c7fed9d7 DM	95	" mov %4, %0\n"
6e57a3a8 DM	96	" .previous\n"
	97	" .section __ex_table,\"a\"\n"
	98	" .align 4\n"
c7fed9d7	99	" .word 1b, 3b\n"
6e57a3a8	100	" .previous\n"
c7fed9d7 DM	101	: "=r" (newval)
c7fed9d7 DM	102	: "0" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT)
6e57a3a8 DM	103	: "memory");
6e57a3a8 DM	104
c7fed9d7	105	return newval;
e9056f13 IM	106	}
e9056f13 IM	107
043df59e	108	#endif /* !(_SPARC64_FUTEX_H) */