mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 12:43:55 +08:00
104 lines
2.4 KiB
C
104 lines
2.4 KiB
C
#ifndef _ASM_FUTEX_H
|
|
#define _ASM_FUTEX_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/futex.h>
|
|
#include <asm/errno.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
#ifdef CONFIG_SMP
|
|
#define __FUTEX_SMP_SYNC " sync \n"
|
|
#else
|
|
#define __FUTEX_SMP_SYNC
|
|
#endif
|
|
|
|
#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
|
|
{ \
|
|
__asm__ __volatile__( \
|
|
" .set push \n" \
|
|
" .set noat \n" \
|
|
" .set mips3 \n" \
|
|
"1: ll %1, (%3) # __futex_atomic_op1 \n" \
|
|
" .set mips0 \n" \
|
|
" " insn " \n" \
|
|
" .set mips3 \n" \
|
|
"2: sc $1, (%3) \n" \
|
|
" beqzl $1, 1b \n" \
|
|
__FUTEX_SMP_SYNC \
|
|
"3: \n" \
|
|
" .set pop \n" \
|
|
" .set mips0 \n" \
|
|
" .section .fixup,\"ax\" \n" \
|
|
"4: li %0, %5 \n" \
|
|
" j 2b \n" \
|
|
" .previous \n" \
|
|
" .section __ex_table,\"a\" \n" \
|
|
" "__UA_ADDR "\t1b, 4b \n" \
|
|
" "__UA_ADDR "\t2b, 4b \n" \
|
|
" .previous \n" \
|
|
: "=r" (ret), "=r" (oldval) \
|
|
: "0" (0), "r" (uaddr), "Jr" (oparg), "i" (-EFAULT)); \
|
|
}
|
|
|
|
static inline int
|
|
futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
|
{
|
|
int op = (encoded_op >> 28) & 7;
|
|
int cmp = (encoded_op >> 24) & 15;
|
|
int oparg = (encoded_op << 8) >> 20;
|
|
int cmparg = (encoded_op << 20) >> 20;
|
|
int oldval = 0, ret;
|
|
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
|
|
oparg = 1 << oparg;
|
|
|
|
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
|
|
return -EFAULT;
|
|
|
|
inc_preempt_count();
|
|
|
|
switch (op) {
|
|
case FUTEX_OP_SET:
|
|
__futex_atomic_op("move $1, %z4", ret, oldval, uaddr, oparg);
|
|
break;
|
|
|
|
case FUTEX_OP_ADD:
|
|
__futex_atomic_op("addu $1, %1, %z4",
|
|
ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_OR:
|
|
__futex_atomic_op("or $1, %1, %z4",
|
|
ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_ANDN:
|
|
__futex_atomic_op("and $1, %1, %z4",
|
|
ret, oldval, uaddr, ~oparg);
|
|
break;
|
|
case FUTEX_OP_XOR:
|
|
__futex_atomic_op("xor $1, %1, %z4",
|
|
ret, oldval, uaddr, oparg);
|
|
break;
|
|
default:
|
|
ret = -ENOSYS;
|
|
}
|
|
|
|
dec_preempt_count();
|
|
|
|
if (!ret) {
|
|
switch (cmp) {
|
|
case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
|
|
case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
|
|
case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
|
|
case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
|
|
case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
|
|
case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
|
|
default: ret = -ENOSYS;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
#endif
|
|
#endif
|