84 lines
1.9 KiB
C
84 lines
1.9 KiB
C
|
#ifndef _ASM_S390_FUTEX_H
|
||
|
|
#define _ASM_S390_FUTEX_H
|
||
|
|
|
||
|
|
#include <linux/uaccess.h>
|
||
|
|
#include <linux/futex.h>
|
||
|
|
#include <asm/mmu_context.h>
|
||
|
|
#include <asm/errno.h>
|
||
|
|
|
||
|
|
#define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \
|
||
|
|
asm volatile( \
|
||
|
|
" sacf 256\n" \
|
||
|
|
"0: l %1,0(%6)\n" \
|
||
|
|
"1:"insn \
|
||
|
|
"2: cs %1,%2,0(%6)\n" \
|
||
|
|
"3: jl 1b\n" \
|
||
|
|
" lhi %0,0\n" \
|
||
|
|
"4: sacf 768\n" \
|
||
|
|
EX_TABLE(0b,4b) EX_TABLE(2b,4b) EX_TABLE(3b,4b) \
|
||
|
|
: "=d" (ret), "=&d" (oldval), "=&d" (newval), \
|
||
|
|
"=m" (*uaddr) \
|
||
|
|
: "0" (-EFAULT), "d" (oparg), "a" (uaddr), \
|
||
|
|
"m" (*uaddr) : "cc");
|
||
|
|
|
||
|
|
static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
|
||
|
|
u32 __user *uaddr)
|
||
|
|
{
|
||
|
|
int oldval = 0, newval, ret;
|
||
|
|
|
||
|
|
load_kernel_asce();
|
||
|
|
|
||
|
|
pagefault_disable();
|
||
|
|
switch (op) {
|
||
|
|
case FUTEX_OP_SET:
|
||
|
|
__futex_atomic_op("lr %2,%5\n",
|
||
|
|
ret, oldval, newval, uaddr, oparg);
|
||
|
|
break;
|
||
|
|
case FUTEX_OP_ADD:
|
||
|
|
__futex_atomic_op("lr %2,%1\nar %2,%5\n",
|
||
|
|
ret, oldval, newval, uaddr, oparg);
|
||
|
|
break;
|
||
|
|
case FUTEX_OP_OR:
|
||
|
|
__futex_atomic_op("lr %2,%1\nor %2,%5\n",
|
||
|
|
ret, oldval, newval, uaddr, oparg);
|
||
|
|
break;
|
||
|
|
case FUTEX_OP_ANDN:
|
||
|
|
__futex_atomic_op("lr %2,%1\nnr %2,%5\n",
|
||
|
|
ret, oldval, newval, uaddr, oparg);
|
||
|
|
break;
|
||
|
|
case FUTEX_OP_XOR:
|
||
|
|
__futex_atomic_op("lr %2,%1\nxr %2,%5\n",
|
||
|
|
ret, oldval, newval, 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;
|
||
|
|
|
||
|
|
load_kernel_asce();
|
||
|
|
asm volatile(
|
||
|
|
" sacf 256\n"
|
||
|
|
"0: cs %1,%4,0(%5)\n"
|
||
|
|
"1: la %0,0\n"
|
||
|
|
"2: sacf 768\n"
|
||
|
|
EX_TABLE(0b,2b) EX_TABLE(1b,2b)
|
||
|
|
: "=d" (ret), "+d" (oldval), "=m" (*uaddr)
|
||
|
|
: "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
|
||
|
|
: "cc", "memory");
|
||
|
|
*uval = oldval;
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* _ASM_S390_FUTEX_H */
|