Release 4.11 arch/alpha/include/asm/futex.h

#ifndef _ASM_ALPHA_FUTEX_H

#define _ASM_ALPHA_FUTEX_H

#ifdef __KERNEL__

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


#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg)	\
	__asm__ __volatile__(                                   \
                __ASM_SMP_MB                                    \
        "1:     ldl_l   %0,0(%2)\n"                             \
                insn                                            \
        "2:     stl_c   %1,0(%2)\n"                             \
        "       beq     %1,4f\n"                                \
        "       mov     $31,%1\n"                               \
        "3:     .subsection 2\n"                                \
        "4:     br      1b\n"                                   \
        "       .previous\n"                                    \
        "       .section __ex_table,\"a\"\n"                    \
        "       .long   1b-.\n"                                 \
        "       lda     $31,3b-1b(%1)\n"                        \
        "       .long   2b-.\n"                                 \
        "       lda     $31,3b-2b(%1)\n"                        \
        "       .previous\n"                                    \
        :       "=&r" (oldval), "=&r"(ret)                      \
        :       "r" (uaddr), "r"(oparg)                         \
        :       "memory")



static inline int futex_atomic_op_inuser (int encoded_op, u32 __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;
	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
		oparg = 1 << oparg;

	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
		return -EFAULT;

	pagefault_disable();

	switch (op) {
	case FUTEX_OP_SET:
		__futex_atomic_op("mov %3,%1\n", ret, oldval, uaddr, oparg);
		break;
	case FUTEX_OP_ADD:
		__futex_atomic_op("addl %0,%3,%1\n", ret, oldval, uaddr, oparg);
		break;
	case FUTEX_OP_OR:
		__futex_atomic_op("or %0,%3,%1\n", ret, oldval, uaddr, oparg);
		break;
	case FUTEX_OP_ANDN:
		__futex_atomic_op("andnot %0,%3,%1\n", ret, oldval, uaddr, oparg);
		break;
	case FUTEX_OP_XOR:
		__futex_atomic_op("xor %0,%3,%1\n", ret, oldval, uaddr, oparg);
		break;
	default:
		ret = -ENOSYS;
	}

	pagefault_enable();

	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;
}

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1
50.00%
Total
298
100.00%
2
100.00%


static inline int

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

	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
		return -EFAULT;

	__asm__ __volatile__ (
                __ASM_SMP_MB
        "1:     ldl_l   %1,0(%3)\n"
        "       cmpeq   %1,%4,%2\n"
        "       beq     %2,3f\n"
        "       mov     %5,%2\n"
        "2:     stl_c   %2,0(%3)\n"
        "       beq     %2,4f\n"
        "3:     .subsection 2\n"
        "4:     br      1b\n"
        "       .previous\n"
        "       .section __ex_table,\"a\"\n"
        "       .long   1b-.\n"
        "       lda     $31,3b-1b(%0)\n"
        "       .long   2b-.\n"
        "       lda     $31,3b-2b(%0)\n"
        "       .previous\n"
        :       "+r"(ret), "=&r"(prev), "=&r"(cmp)
        :       "r"(uaddr), "r"((long)(int)oldval), "r"(newval)
        :       "memory");

	*uval = prev;
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ivan Kokshaysky
40
64.52%
1
25.00%
Michel Lespinasse
21
33.87%
2
50.00%
Andrew Morton
1
1.61%
1
25.00%
Total
62
100.00%
4
100.00%

#endif /* __KERNEL__ */
#endif /* _ASM_ALPHA_FUTEX_H */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Ivan Kokshaysky
371
92.06%
1
20.00%
Michel Lespinasse
23
5.71%
2
40.00%
Jakub Jelínek
8
1.99%
1
20.00%
Andrew Morton
1
0.25%
1
20.00%
Total
403
100.00%
5
100.00%
Directory: arch/alpha/include/asm

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