Contributors: 12
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Jakub Jelínek |
152 |
49.84% |
1 |
6.67% |
| Christophe Leroy |
42 |
13.77% |
2 |
13.33% |
| David Woodhouse |
20 |
6.56% |
1 |
6.67% |
| Michel Lespinasse |
20 |
6.56% |
2 |
13.33% |
| Ingo Molnar |
18 |
5.90% |
2 |
13.33% |
| Al Viro |
17 |
5.57% |
1 |
6.67% |
| Michael Ellerman |
12 |
3.93% |
1 |
6.67% |
| Jiri Slaby |
11 |
3.61% |
1 |
6.67% |
| Paul Mackerras |
5 |
1.64% |
1 |
6.67% |
| David Gibson |
4 |
1.31% |
1 |
6.67% |
| Jeff Dike |
3 |
0.98% |
1 |
6.67% |
| Greg Kroah-Hartman |
1 |
0.33% |
1 |
6.67% |
| Total |
305 |
|
15 |
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_FUTEX_H
#define _ASM_POWERPC_FUTEX_H
#ifdef __KERNEL__
#include <linux/futex.h>
#include <linux/uaccess.h>
#include <asm/errno.h>
#include <asm/synch.h>
#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
__asm__ __volatile ( \
PPC_ATOMIC_ENTRY_BARRIER \
"1: lwarx %0,0,%2\n" \
insn \
"2: stwcx. %1,0,%2\n" \
"bne- 1b\n" \
PPC_ATOMIC_EXIT_BARRIER \
"li %1,0\n" \
"3: .section .fixup,\"ax\"\n" \
"4: li %1,%3\n" \
"b 3b\n" \
".previous\n" \
EX_TABLE(1b, 4b) \
EX_TABLE(2b, 4b) \
: "=&r" (oldval), "=&r" (ret) \
: "b" (uaddr), "i" (-EFAULT), "r" (oparg) \
: "cr0", "memory")
static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
u32 __user *uaddr)
{
int oldval = 0, ret;
if (!access_ok(uaddr, sizeof(u32)))
return -EFAULT;
allow_read_write_user(uaddr, uaddr, sizeof(*uaddr));
switch (op) {
case FUTEX_OP_SET:
__futex_atomic_op("mr %1,%4\n", ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_ADD:
__futex_atomic_op("add %1,%0,%4\n", ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_OR:
__futex_atomic_op("or %1,%0,%4\n", ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_ANDN:
__futex_atomic_op("andc %1,%0,%4\n", ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_XOR:
__futex_atomic_op("xor %1,%0,%4\n", ret, oldval, uaddr, oparg);
break;
default:
ret = -ENOSYS;
}
*oval = oldval;
prevent_read_write_user(uaddr, uaddr, sizeof(*uaddr));
return ret;
}
static inline int
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
u32 oldval, u32 newval)
{
int ret = 0;
u32 prev;
if (!access_ok(uaddr, sizeof(u32)))
return -EFAULT;
allow_read_write_user(uaddr, uaddr, sizeof(*uaddr));
__asm__ __volatile__ (
PPC_ATOMIC_ENTRY_BARRIER
"1: lwarx %1,0,%3 # futex_atomic_cmpxchg_inatomic\n\
cmpw 0,%1,%4\n\
bne- 3f\n"
"2: stwcx. %5,0,%3\n\
bne- 1b\n"
PPC_ATOMIC_EXIT_BARRIER
"3: .section .fixup,\"ax\"\n\
4: li %0,%6\n\
b 3b\n\
.previous\n"
EX_TABLE(1b, 4b)
EX_TABLE(2b, 4b)
: "+r" (ret), "=&r" (prev), "+m" (*uaddr)
: "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT)
: "cc", "memory");
*uval = prev;
prevent_read_write_user(uaddr, uaddr, sizeof(*uaddr));
return ret;
}
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_FUTEX_H */