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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _SPARC64_FUTEX_H
#define _SPARC64_FUTEX_H

#include <linux/futex.h>
#include <linux/uaccess.h>
#include <asm/errno.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:	sethi	%%hi(3b), %0\n"			\
	"	jmpl	%0 + %%lo(3b), %%g0\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 arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
		u32 __user *uaddr)
{
	int oldval = 0, ret, tem;

	if (unlikely((((unsigned long) uaddr) & 0x3UL)))
		return -EINVAL;

	pagefault_disable();

	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("andn\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;
	}

	pagefault_enable();

	if (!ret)
		*oval = oldval;

	return ret;
}

static inline int
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
			      u32 oldval, u32 newval)
{
	int ret = 0;

	__asm__ __volatile__(
	"\n1:	casa	[%4] %%asi, %3, %1\n"
	"2:\n"
	"	.section .fixup,#alloc,#execinstr\n"
	"	.align	4\n"
	"3:	sethi	%%hi(2b), %0\n"
	"	jmpl	%0 + %%lo(2b), %%g0\n"
	"	mov	%5, %0\n"
	"	.previous\n"
	"	.section __ex_table,\"a\"\n"
	"	.align	4\n"
	"	.word	1b, 3b\n"
	"	.previous\n"
	: "+r" (ret), "=r" (newval)
	: "1" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT)
	: "memory");

	*uval = newval;
	return ret;
}

#endif /* !(_SPARC64_FUTEX_H) */

Filemanager

Name Type Size Permission Actions
Kbuild File 491 B 0644
agp.h File 434 B 0644
apb.h File 1.06 KB 0644
asm-offsets.h File 35 B 0644
asm-prototypes.h File 727 B 0644
asm.h File 1.08 KB 0644
asmmacro.h File 1.16 KB 0644
atomic.h File 219 B 0644
atomic_32.h File 2.26 KB 0644
atomic_64.h File 3.34 KB 0644
auxio.h File 310 B 0644
auxio_32.h File 2.55 KB 0644
auxio_64.h File 3.18 KB 0644
backoff.h File 2.7 KB 0644
barrier.h File 223 B 0644
barrier_32.h File 160 B 0644
barrier_64.h File 1.96 KB 0644
bbc.h File 9.76 KB 0644
bitext.h File 631 B 0644
bitops.h File 219 B 0644
bitops_32.h File 2.79 KB 0644
bitops_64.h File 1.64 KB 0644
btext.h File 145 B 0644
bug.h File 588 B 0644
bugs.h File 404 B 0644
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cacheflush.h File 373 B 0644
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checksum.h File 227 B 0644
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chmctrl.h File 7.91 KB 0644
clock.h File 231 B 0644
clocksource.h File 407 B 0644
cmpxchg.h File 223 B 0644
cmpxchg_32.h File 2.4 KB 0644
cmpxchg_64.h File 5.13 KB 0644
compat.h File 6.45 KB 0644
compat_signal.h File 565 B 0644
contregs.h File 1.9 KB 0644
cpu_type.h File 579 B 0644
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current.h File 991 B 0644
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delay.h File 215 B 0644
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device.h File 565 B 0644
dma-mapping.h File 632 B 0644
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ecc.h File 4.34 KB 0644
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futex.h File 215 B 0644
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futex_64.h File 2.15 KB 0644
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percpu_32.h File 168 B 0644
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perf_event.h File 802 B 0644
pgalloc.h File 223 B 0644
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pgtable_32.h File 11.35 KB 0644
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processor.h File 231 B 0644
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starfire.h File 418 B 0644
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ttable.h File 20.08 KB 0644
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uaccess.h File 363 B 0644
uaccess_32.h File 8.31 KB 0644
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unaligned.h File 339 B 0644
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xor.h File 207 B 0644
xor_32.h File 7.31 KB 0644
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