forked from 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.
107 lines
2.4 KiB
107 lines
2.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
|
/* |
|
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited |
|
*/ |
|
#ifndef _ASM_FUTEX_H |
|
#define _ASM_FUTEX_H |
|
|
|
#include <linux/futex.h> |
|
#include <linux/uaccess.h> |
|
#include <asm/barrier.h> |
|
#include <asm/errno.h> |
|
|
|
#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ |
|
{ \ |
|
__asm__ __volatile__( \ |
|
"1: ll.w %1, %4 # __futex_atomic_op\n" \ |
|
" " insn " \n" \ |
|
"2: sc.w $t0, %2 \n" \ |
|
" beqz $t0, 1b \n" \ |
|
"3: \n" \ |
|
" .section .fixup,\"ax\" \n" \ |
|
"4: li.w %0, %6 \n" \ |
|
" b 3b \n" \ |
|
" .previous \n" \ |
|
" .section __ex_table,\"a\" \n" \ |
|
" "__UA_ADDR "\t1b, 4b \n" \ |
|
" "__UA_ADDR "\t2b, 4b \n" \ |
|
" .previous \n" \ |
|
: "=r" (ret), "=&r" (oldval), \ |
|
"=ZC" (*uaddr) \ |
|
: "0" (0), "ZC" (*uaddr), "Jr" (oparg), \ |
|
"i" (-EFAULT) \ |
|
: "memory", "t0"); \ |
|
} |
|
|
|
static inline int |
|
arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr) |
|
{ |
|
int oldval = 0, ret = 0; |
|
|
|
pagefault_disable(); |
|
|
|
switch (op) { |
|
case FUTEX_OP_SET: |
|
__futex_atomic_op("move $t0, %z5", ret, oldval, uaddr, oparg); |
|
break; |
|
case FUTEX_OP_ADD: |
|
__futex_atomic_op("add.w $t0, %1, %z5", ret, oldval, uaddr, oparg); |
|
break; |
|
case FUTEX_OP_OR: |
|
__futex_atomic_op("or $t0, %1, %z5", ret, oldval, uaddr, oparg); |
|
break; |
|
case FUTEX_OP_ANDN: |
|
__futex_atomic_op("and $t0, %1, %z5", ret, oldval, uaddr, ~oparg); |
|
break; |
|
case FUTEX_OP_XOR: |
|
__futex_atomic_op("xor $t0, %1, %z5", 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; |
|
u32 val = 0; |
|
|
|
if (!access_ok(uaddr, sizeof(u32))) |
|
return -EFAULT; |
|
|
|
__asm__ __volatile__( |
|
"# futex_atomic_cmpxchg_inatomic \n" |
|
"1: ll.w %1, %3 \n" |
|
" bne %1, %z4, 3f \n" |
|
" move $t0, %z5 \n" |
|
"2: sc.w $t0, %2 \n" |
|
" beqz $t0, 1b \n" |
|
"3: \n" |
|
__WEAK_LLSC_MB |
|
" .section .fixup,\"ax\" \n" |
|
"4: li.d %0, %6 \n" |
|
" b 3b \n" |
|
" .previous \n" |
|
" .section __ex_table,\"a\" \n" |
|
" "__UA_ADDR "\t1b, 4b \n" |
|
" "__UA_ADDR "\t2b, 4b \n" |
|
" .previous \n" |
|
: "+r" (ret), "=&r" (val), "=ZC" (*uaddr) |
|
: "ZC" (*uaddr), "Jr" (oldval), "Jr" (newval), |
|
"i" (-EFAULT) |
|
: "memory", "t0"); |
|
|
|
*uval = val; |
|
|
|
return ret; |
|
} |
|
|
|
#endif /* _ASM_FUTEX_H */
|
|
|