mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
104 lines
2.2 KiB
104 lines
2.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
|
#ifndef __ASM_OPENRISC_FUTEX_H |
|
#define __ASM_OPENRISC_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: l.lwa %0, %2 \n" \ |
|
insn "\n" \ |
|
"2: l.swa %2, %1 \n" \ |
|
" l.bnf 1b \n" \ |
|
" l.ori %1, r0, 0 \n" \ |
|
"3: \n" \ |
|
".section .fixup,\"ax\" \n" \ |
|
"4: l.j 3b \n" \ |
|
" l.addi %1, r0, %3 \n" \ |
|
".previous \n" \ |
|
".section __ex_table,\"a\" \n" \ |
|
".word 1b,4b,2b,4b \n" \ |
|
".previous \n" \ |
|
: "=&r" (oldval), "=&r" (ret), "+m" (*uaddr) \ |
|
: "i" (-EFAULT), "r" (oparg) \ |
|
: "cc", "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; |
|
|
|
switch (op) { |
|
case FUTEX_OP_SET: |
|
__futex_atomic_op("l.or %1,%4,%4", ret, oldval, uaddr, oparg); |
|
break; |
|
case FUTEX_OP_ADD: |
|
__futex_atomic_op("l.add %1,%0,%4", ret, oldval, uaddr, oparg); |
|
break; |
|
case FUTEX_OP_OR: |
|
__futex_atomic_op("l.or %1,%0,%4", ret, oldval, uaddr, oparg); |
|
break; |
|
case FUTEX_OP_ANDN: |
|
__futex_atomic_op("l.and %1,%0,%4", ret, oldval, uaddr, ~oparg); |
|
break; |
|
case FUTEX_OP_XOR: |
|
__futex_atomic_op("l.xor %1,%0,%4", ret, oldval, uaddr, oparg); |
|
break; |
|
default: |
|
ret = -ENOSYS; |
|
} |
|
|
|
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; |
|
u32 prev; |
|
|
|
if (!access_ok(uaddr, sizeof(u32))) |
|
return -EFAULT; |
|
|
|
__asm__ __volatile__ ( \ |
|
"1: l.lwa %1, %2 \n" \ |
|
" l.sfeq %1, %3 \n" \ |
|
" l.bnf 3f \n" \ |
|
" l.nop \n" \ |
|
"2: l.swa %2, %4 \n" \ |
|
" l.bnf 1b \n" \ |
|
" l.nop \n" \ |
|
"3: \n" \ |
|
".section .fixup,\"ax\" \n" \ |
|
"4: l.j 3b \n" \ |
|
" l.addi %0, r0, %5 \n" \ |
|
".previous \n" \ |
|
".section __ex_table,\"a\" \n" \ |
|
".word 1b,4b,2b,4b \n" \ |
|
".previous \n" \ |
|
: "+r" (ret), "=&r" (prev), "+m" (*uaddr) \ |
|
: "r" (oldval), "r" (newval), "i" (-EFAULT) \ |
|
: "cc", "memory" \ |
|
); |
|
|
|
*uval = prev; |
|
return ret; |
|
} |
|
|
|
#endif /* __KERNEL__ */ |
|
|
|
#endif /* __ASM_OPENRISC_FUTEX_H */
|
|
|