Release 4.14 arch/s390/include/asm/futex.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_S390_FUTEX_H

#define _ASM_S390_FUTEX_H

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


#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  768\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");



static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
		u32 __user *uaddr)
{
	int oldval = 0, newval, ret;

	load_kernel_asce();

	pagefault_disable();
	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;
	}
	pagefault_enable();

	if (!ret)
		*oval = oldval;

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Heiko Carstens
108
67.50%
2
33.33%
Martin Schwidefsky
40
25.00%
2
33.33%
Jiri Slaby
11
6.88%
1
16.67%
Michel Lespinasse
1
0.62%
1
16.67%
Total
160
100.00%
6
100.00%



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

	load_kernel_asce();
	asm volatile(
                "   sacf 256\n"
                "0: cs   %1,%4,0(%5)\n"
                "1: la   %0,0\n"
                "2: sacf 768\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");
	*uval = oldval;
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Heiko Carstens
37
94.87%
1
50.00%
Martin Schwidefsky
2
5.13%
1
50.00%
Total
39
100.00%
2
100.00%

#endif /* _ASM_S390_FUTEX_H */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Heiko Carstens
168
70.29%
3
33.33%
Martin Schwidefsky
50
20.92%
2
22.22%
Jiri Slaby
11
4.60%
1
11.11%
Jakub Jelínek
8
3.35%
1
11.11%
Michel Lespinasse
1
0.42%
1
11.11%
Greg Kroah-Hartman
1
0.42%
1
11.11%
Total
239
100.00%
9
100.00%
Directory: arch/s390/include/asm

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