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kernel/linux-rt-4.4.41/arch/s390/include/asm/futex.h 2.46 KB
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  #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
  "					\
  		"0: l     %1,0(%6)
  "					\
  		"1:"insn						\
  		"2: cs    %1,%2,0(%6)
  "				\
  		"3: jl    1b
  "						\
  		"   lhi   %0,0
  "					\
  		"4: sacf  768
  "					\
  		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 futex_atomic_op_inuser(int encoded_op, u32 __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, newval, ret;
  
  	load_kernel_asce();
  	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
  		oparg = 1 << oparg;
  
  	pagefault_disable();
  	switch (op) {
  	case FUTEX_OP_SET:
  		__futex_atomic_op("lr %2,%5
  ",
  				  ret, oldval, newval, uaddr, oparg);
  		break;
  	case FUTEX_OP_ADD:
  		__futex_atomic_op("lr %2,%1
  ar %2,%5
  ",
  				  ret, oldval, newval, uaddr, oparg);
  		break;
  	case FUTEX_OP_OR:
  		__futex_atomic_op("lr %2,%1
  or %2,%5
  ",
  				  ret, oldval, newval, uaddr, oparg);
  		break;
  	case FUTEX_OP_ANDN:
  		__futex_atomic_op("lr %2,%1
  nr %2,%5
  ",
  				  ret, oldval, newval, uaddr, oparg);
  		break;
  	case FUTEX_OP_XOR:
  		__futex_atomic_op("lr %2,%1
  xr %2,%5
  ",
  				  ret, oldval, newval, uaddr, oparg);
  		break;
  	default:
  		ret = -ENOSYS;
  	}
  	pagefault_enable();
  
  	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;
  }
  
  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
  "
  		"0: cs   %1,%4,0(%5)
  "
  		"1: la   %0,0
  "
  		"2: sacf 768
  "
  		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 */