mirror of https://gitee.com/openkylin/linux.git
100 lines
2.1 KiB
C
100 lines
2.1 KiB
C
#ifndef _ASM_MICROBLAZE_FUTEX_H
|
|
#define _ASM_MICROBLAZE_FUTEX_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/futex.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/errno.h>
|
|
|
|
#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
|
|
({ \
|
|
__asm__ __volatile__ ( \
|
|
"1: lwx %0, %2, r0; " \
|
|
insn \
|
|
"2: swx %1, %2, r0; \
|
|
addic %1, r0, 0; \
|
|
bnei %1, 1b; \
|
|
3: \
|
|
.section .fixup,\"ax\"; \
|
|
4: brid 3b; \
|
|
addik %1, r0, %3; \
|
|
.previous; \
|
|
.section __ex_table,\"a\"; \
|
|
.word 1b,4b,2b,4b; \
|
|
.previous;" \
|
|
: "=&r" (oldval), "=&r" (ret) \
|
|
: "r" (uaddr), "i" (-EFAULT), "r" (oparg) \
|
|
); \
|
|
})
|
|
|
|
static inline int
|
|
arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|
{
|
|
int oldval = 0, ret;
|
|
|
|
pagefault_disable();
|
|
|
|
switch (op) {
|
|
case FUTEX_OP_SET:
|
|
__futex_atomic_op("or %1,%4,%4;", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_ADD:
|
|
__futex_atomic_op("add %1,%0,%4;", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_OR:
|
|
__futex_atomic_op("or %1,%0,%4;", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_ANDN:
|
|
__futex_atomic_op("andn %1,%0,%4;", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_XOR:
|
|
__futex_atomic_op("xor %1,%0,%4;", ret, oldval, uaddr, oparg);
|
|
break;
|
|
default:
|
|
ret = -ENOSYS;
|
|
}
|
|
|
|
pagefault_enable();
|
|
|
|
if (!ret)
|
|
*oval = oldval;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline int
|
|
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
|
|
u32 oldval, u32 newval)
|
|
{
|
|
int ret = 0, cmp;
|
|
u32 prev;
|
|
|
|
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
|
return -EFAULT;
|
|
|
|
__asm__ __volatile__ ("1: lwx %1, %3, r0; \
|
|
cmp %2, %1, %4; \
|
|
bnei %2, 3f; \
|
|
2: swx %5, %3, r0; \
|
|
addic %2, r0, 0; \
|
|
bnei %2, 1b; \
|
|
3: \
|
|
.section .fixup,\"ax\"; \
|
|
4: brid 3b; \
|
|
addik %0, r0, %6; \
|
|
.previous; \
|
|
.section __ex_table,\"a\"; \
|
|
.word 1b,4b,2b,4b; \
|
|
.previous;" \
|
|
: "+r" (ret), "=&r" (prev), "=&r"(cmp) \
|
|
: "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT));
|
|
|
|
*uval = prev;
|
|
return ret;
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif
|