Release 4.14 arch/x86/include/asm/futex.h
/* SPDX-License-Identifier: GPL-2.0 */
#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 arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
u32 __user *uaddr)
{
int oldval = 0, ret, tem;
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)
*oval = oldval;
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Thomas Gleixner | 135 | 90.60% | 1 | 25.00% |
| Jiri Slaby | 11 | 7.38% | 1 | 25.00% |
| Mathieu Desnoyers | 2 | 1.34% | 1 | 25.00% |
| Michel Lespinasse | 1 | 0.67% | 1 | 25.00% |
| Total | 149 | 100.00% | 4 | 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 | 208 | 83.87% | 2 | 18.18% |
| Jiri Slaby | 11 | 4.44% | 1 | 9.09% |
| H. Peter Anvin | 8 | 3.23% | 2 | 18.18% |
| Michel Lespinasse | 8 | 3.23% | 2 | 18.18% |
| Qiaowei Ren | 6 | 2.42% | 1 | 9.09% |
| Jeff Dike | 4 | 1.61% | 1 | 9.09% |
| Mathieu Desnoyers | 2 | 0.81% | 1 | 9.09% |
| Greg Kroah-Hartman | 1 | 0.40% | 1 | 9.09% |
| Joe Perches | | 0.00% | 0 | 0.00% |
| Total | 248 | 100.00% | 11 | 100.00% |
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