Contributors: 13
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Thomas Gleixner |
109 |
39.21% |
3 |
15.79% |
| Al Viro |
80 |
28.78% |
3 |
15.79% |
| Jakub Jelínek |
40 |
14.39% |
1 |
5.26% |
| Baruch Siach |
13 |
4.68% |
1 |
5.26% |
| Jiri Slaby |
9 |
3.24% |
1 |
5.26% |
| Michel Lespinasse |
8 |
2.88% |
2 |
10.53% |
| H. Peter Anvin |
6 |
2.16% |
2 |
10.53% |
| Jeff Dike |
4 |
1.44% |
1 |
5.26% |
| Peter Zijlstra |
3 |
1.08% |
1 |
5.26% |
| Mathieu Desnoyers |
2 |
0.72% |
1 |
5.26% |
| Ingo Molnar |
2 |
0.72% |
1 |
5.26% |
| Qiaowei Ren |
1 |
0.36% |
1 |
5.26% |
| Greg Kroah-Hartman |
1 |
0.36% |
1 |
5.26% |
| Total |
278 |
|
19 |
|
/* 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 unsafe_atomic_op1(insn, oval, uaddr, oparg, label) \
do { \
int oldval = 0, ret; \
asm volatile("1:\t" insn "\n" \
"2:\n" \
_ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG, %1) \
: "=r" (oldval), "=r" (ret), "+m" (*uaddr) \
: "0" (oparg), "1" (0)); \
if (ret) \
goto label; \
*oval = oldval; \
} while(0)
#define unsafe_atomic_op2(insn, oval, uaddr, oparg, label) \
do { \
int oldval = 0, ret, tem; \
asm volatile("1:\tmovl %2, %0\n" \
"2:\tmovl\t%0, %3\n" \
"\t" insn "\n" \
"3:\t" LOCK_PREFIX "cmpxchgl %3, %2\n" \
"\tjnz\t2b\n" \
"4:\n" \
_ASM_EXTABLE_TYPE_REG(1b, 4b, EX_TYPE_EFAULT_REG, %1) \
_ASM_EXTABLE_TYPE_REG(3b, 4b, EX_TYPE_EFAULT_REG, %1) \
: "=&a" (oldval), "=&r" (ret), \
"+m" (*uaddr), "=&r" (tem) \
: "r" (oparg), "1" (0)); \
if (ret) \
goto label; \
*oval = oldval; \
} while(0)
static __always_inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
u32 __user *uaddr)
{
if (!user_access_begin(uaddr, sizeof(u32)))
return -EFAULT;
switch (op) {
case FUTEX_OP_SET:
unsafe_atomic_op1("xchgl %0, %2", oval, uaddr, oparg, Efault);
break;
case FUTEX_OP_ADD:
unsafe_atomic_op1(LOCK_PREFIX "xaddl %0, %2", oval,
uaddr, oparg, Efault);
break;
case FUTEX_OP_OR:
unsafe_atomic_op2("orl %4, %3", oval, uaddr, oparg, Efault);
break;
case FUTEX_OP_ANDN:
unsafe_atomic_op2("andl %4, %3", oval, uaddr, ~oparg, Efault);
break;
case FUTEX_OP_XOR:
unsafe_atomic_op2("xorl %4, %3", oval, uaddr, oparg, Efault);
break;
default:
user_access_end();
return -ENOSYS;
}
user_access_end();
return 0;
Efault:
user_access_end();
return -EFAULT;
}
static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
u32 oldval, u32 newval)
{
int ret = 0;
if (!user_access_begin(uaddr, sizeof(u32)))
return -EFAULT;
asm volatile("\n"
"1:\t" LOCK_PREFIX "cmpxchgl %3, %2\n"
"2:\n"
_ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG, %0) \
: "+r" (ret), "=a" (oldval), "+m" (*uaddr)
: "r" (newval), "1" (oldval)
: "memory"
);
user_access_end();
*uval = oldval;
return ret;
}
#endif
#endif /* _ASM_X86_FUTEX_H */