Release 4.11 arch/ia64/include/asm/futex.h

#ifndef _ASM_FUTEX_H

#define _ASM_FUTEX_H

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


#define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \
do {                                                                    \
        register unsigned long r8 __asm ("r8") = 0;                     \
        __asm__ __volatile__(                                           \
                "       mf;;                                    \n"     \
                "[1:] " insn ";;                                \n"     \
                "       .xdata4 \"__ex_table\", 1b-., 2f-.      \n"     \
                "[2:]"                                                  \
                : "+r" (r8), "=r" (oldval)                              \
                : "r" (uaddr), "r" (oparg)                              \
                : "memory");                                            \
        ret = r8;                                                       \
} while (0)


#define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \
do {                                                                    \
        register unsigned long r8 __asm ("r8") = 0;                     \
        int val, newval;                                                \
        do {                                                            \
                __asm__ __volatile__(                                   \
                        "       mf;;                              \n"   \
                        "[1:]   ld4 %3=[%4];;                     \n"   \
                        "       mov %2=%3                         \n"   \
                                insn    ";;                       \n"   \
                        "       mov ar.ccv=%2;;                   \n"   \
                        "[2:]   cmpxchg4.acq %1=[%4],%3,ar.ccv;;  \n"   \
                        "       .xdata4 \"__ex_table\", 1b-., 3f-.\n"   \
                        "       .xdata4 \"__ex_table\", 2b-., 3f-.\n"   \
                        "[3:]"                                          \
                        : "+r" (r8), "=r" (val), "=&r" (oldval),        \
                           "=&r" (newval)                               \
                        : "r" (uaddr), "r" (oparg)                      \
                        : "memory");                                    \
                if (unlikely (r8))                                      \
                        break;                                          \
        } while (unlikely (val != oldval));                             \
        ret = r8;                                                       \
} while (0)


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_op1("xchg4 %1=[%2],%3", ret, oldval, uaddr,
				   oparg);
		break;
	case FUTEX_OP_ADD:
		__futex_atomic_op2("add %3=%3,%5", ret, oldval, uaddr, oparg);
		break;
	case FUTEX_OP_OR:
		__futex_atomic_op2("or %3=%3,%5", ret, oldval, uaddr, oparg);
		break;
	case FUTEX_OP_ANDN:
		__futex_atomic_op2("and %3=%3,%5", ret, oldval, uaddr,
				   ~oparg);
		break;
	case FUTEX_OP_XOR:
		__futex_atomic_op2("xor %3=%3,%5", 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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jakub Jelínek
295
98.66%
1
33.33%
Peter Zijlstra
2
0.67%
1
33.33%
Michel Lespinasse
2
0.67%
1
33.33%
Total
299
100.00%
3
100.00%


static inline int

futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
			      u32 oldval, u32 newval)
{
	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
		return -EFAULT;

	{
		register unsigned long r8 __asm ("r8") = 0;
		unsigned long prev;
		__asm__ __volatile__(
                        "       mf;;                                    \n"
                        "       mov ar.ccv=%4;;                         \n"
                        "[1:]   cmpxchg4.acq %1=[%2],%3,ar.ccv          \n"
                        "       .xdata4 \"__ex_table\", 1b-., 2f-.      \n"
                        "[2:]"
                        : "+r" (r8), "=&r" (prev)
                        : "r" (uaddr), "r" (newval),
                          "rO" ((long) (unsigned) oldval)
                        : "memory");
		*uval = prev;
		return r8;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jakub Jelínek
44
69.84%
1
25.00%
Michel Lespinasse
17
26.98%
2
50.00%
Stephan Schreiber
2
3.17%
1
25.00%
Total
63
100.00%
4
100.00%

#endif /* _ASM_FUTEX_H */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Jakub Jelínek
387
93.93%
2
28.57%
Michel Lespinasse
19
4.61%
2
28.57%
Peter Zijlstra
2
0.49%
1
14.29%
Stephan Schreiber
2
0.49%
1
14.29%
Jeff Dike
2
0.49%
1
14.29%
Total
412
100.00%
7
100.00%
Directory: arch/ia64/include/asm

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