Release 4.11 arch/x86/include/asm/futex.h

#ifndef _ASM_X86_FUTEX_H

#define _ASM_X86_FUTEX_H

#ifdef __KERNEL__

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

#include <asm/asm.h>
#include <asm/errno.h>
#include <asm/processor.h>
#include <asm/smap.h>


#define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg)	\
	asm volatile("\t" ASM_STAC "\n"                         \
                     "1:\t" insn "\n"                           \
                     "2:\t" ASM_CLAC "\n"                       \
                     "\t.section .fixup,\"ax\"\n"               \
                     "3:\tmov\t%3, %1\n"                        \
                     "\tjmp\t2b\n"                              \
                     "\t.previous\n"                            \
                     _ASM_EXTABLE(1b, 3b)                       \
                     : "=r" (oldval), "=r" (ret), "+m" (*uaddr) \
                     : "i" (-EFAULT), "0" (oparg), "1" (0))


#define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg)	\
	asm volatile("\t" ASM_STAC "\n"                         \
                     "1:\tmovl  %2, %0\n"                       \
                     "\tmovl\t%0, %3\n"                         \
                     "\t" insn "\n"                             \
                     "2:\t" LOCK_PREFIX "cmpxchgl %3, %2\n"     \
                     "\tjnz\t1b\n"                              \
                     "3:\t" ASM_CLAC "\n"                       \
                     "\t.section .fixup,\"ax\"\n"               \
                     "4:\tmov\t%5, %1\n"                        \
                     "\tjmp\t3b\n"                              \
                     "\t.previous\n"                            \
                     _ASM_EXTABLE(1b, 4b)                       \
                     _ASM_EXTABLE(2b, 4b)                       \
                     : "=&a" (oldval), "=&r" (ret),             \
                       "+m" (*uaddr), "=&r" (tem)               \
                     : "r" (oparg), "i" (-EFAULT), "1" (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, tem;

	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("xchgl %0, %2", ret, oldval, uaddr, oparg);
		break;
	case FUTEX_OP_ADD:
		__futex_atomic_op1(LOCK_PREFIX "xaddl %0, %2", ret, oldval,
				   uaddr, oparg);
		break;
	case FUTEX_OP_OR:
		__futex_atomic_op2("orl %4, %3", ret, oldval, uaddr, oparg);
		break;
	case FUTEX_OP_ANDN:
		__futex_atomic_op2("andl %4, %3", ret, oldval, uaddr, ~oparg);
		break;
	case FUTEX_OP_XOR:
		__futex_atomic_op2("xorl %4, %3", 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
Thomas Gleixner
298
98.68%
1
33.33%
Michel Lespinasse
2
0.66%
1
33.33%
Mathieu Desnoyers
2
0.66%
1
33.33%
Total
302
100.00%
3
100.00%



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Gleixner
21
61.76%
1
25.00%
Michel Lespinasse
7
20.59%
2
50.00%
Qiaowei Ren
6
17.65%
1
25.00%
Total
34
100.00%
4
100.00%

#endif
#endif /* _ASM_X86_FUTEX_H */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Gleixner
371
92.75%
2
22.22%
Michel Lespinasse
9
2.25%
2
22.22%
H. Peter Anvin
8
2.00%
2
22.22%
Qiaowei Ren
6
1.50%
1
11.11%
Jeff Dike
4
1.00%
1
11.11%
Mathieu Desnoyers
2
0.50%
1
11.11%
Joe Perches
0.00%
0
0.00%
Total
400
100.00%
9
100.00%
Directory: arch/x86/include/asm

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