1 files changed, 119 insertions, 4 deletions
diff --git a/include/asm-s390/futex.h b/include/asm-s390/futex.h
index 6a332a9f099c..40c25e166a9b 100644
--- a/include/asm-s390/futex.h
+++ b/include/asm-s390/futex.h
@@ -1,6 +1,121 @@
-#ifndef _ASM_FUTEX_H
+#ifndef _ASM_S390_FUTEX_H
-#define _ASM_FUTEX_H
+#define _ASM_S390_FUTEX_H
-#include <asm-generic/futex.h>
+#ifdef __KERNEL__
-#endif
+#include <linux/futex.h>
+#include <asm/errno.h>
+#include <asm/uaccess.h>
+#ifndef __s390x__
+#define __futex_atomic_fixup \
+                     ".section __ex_table,\"a\"\n"                      \
+                     "   .align 4\n"                                    \
+                     "   .long  0b,2b,1b,2b\n"                          \
+                     ".previous"
+#else /* __s390x__ */
+#define __futex_atomic_fixup \
+                     ".section __ex_table,\"a\"\n"                      \
+                     "   .align 8\n"                                    \
+                     "   .quad  0b,2b,1b,2b\n"                          \
+                     ".previous"
+#endif /* __s390x__ */
+#define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg)      \
+        asm volatile("   l   %1,0(%6)\n"                                \
+                     "0: " insn                                         \
+                     "   cs  %1,%2,0(%6)\n"                             \
+                     "1: jl  0b\n"                                      \
+                     "   lhi %0,0\n"                                    \
+                     "2:\n"                                             \
+                     __futex_atomic_fixup                               \
+                     : "=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, 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, newval, 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("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;
+        }
+        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;
+}
+static inline int
+futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
+{
+        int ret;
+        if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
+                return -EFAULT;
+        asm volatile("   cs   %1,%4,0(%5)\n"
+                     "0: lr   %0,%1\n"
+                     "1:\n"
+#ifndef __s390x__
+                     ".section __ex_table,\"a\"\n"
+                     "   .align 4\n"
+                     "   .long  0b,1b\n"
+                     ".previous"
+#else /* __s390x__ */
+                     ".section __ex_table,\"a\"\n"
+                     "   .align 8\n"
+                     "   .quad  0b,1b\n"
+                     ".previous"
+#endif /* __s390x__ */
+                     : "=d" (ret), "+d" (oldval), "=m" (*uaddr)
+                     : "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
+                     : "cc", "memory" );
+        return oldval;
+}
+#endif /* __KERNEL__ */
+#endif /* _ASM_S390_FUTEX_H */

diff --git a/include/asm-s390/futex.h b/include/asm-s390/futex.h index 6a332a9f099c..40c25e166a9b 100644 --- a/include/asm-s390/futex.h +++ b/include/asm-s390/futex.h
@@ -1,6 +1,121 @@
1	#ifndef _ASM_FUTEX_H	1	#ifndef _ASM_S390_FUTEX_H
2	#define _ASM_FUTEX_H	2	#define _ASM_S390_FUTEX_H
3		3
4	#include <asm-generic/futex.h>	4	#ifdef __KERNEL__
5		5
6	#endif	6	#include <linux/futex.h>
		7	#include <asm/errno.h>
		8	#include <asm/uaccess.h>
		9
		10	#ifndef __s390x__
		11	#define __futex_atomic_fixup \
		12	".section __ex_table,\"a\"\n" \
		13	" .align 4\n" \
		14	" .long 0b,2b,1b,2b\n" \
		15	".previous"
		16	#else /* __s390x__ */
		17	#define __futex_atomic_fixup \
		18	".section __ex_table,\"a\"\n" \
		19	" .align 8\n" \
		20	" .quad 0b,2b,1b,2b\n" \
		21	".previous"
		22	#endif /* __s390x__ */
		23
		24	#define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \
		25	asm volatile(" l %1,0(%6)\n" \
		26	"0: " insn \
		27	" cs %1,%2,0(%6)\n" \
		28	"1: jl 0b\n" \
		29	" lhi %0,0\n" \
		30	"2:\n" \
		31	__futex_atomic_fixup \
		32	: "=d" (ret), "=&d" (oldval), "=&d" (newval), \
		33	"=m" (*uaddr) \
		34	: "0" (-EFAULT), "d" (oparg), "a" (uaddr), \
		35	"m" (*uaddr) : "cc" );
		36
		37	static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
		38	{
		39	int op = (encoded_op >> 28) & 7;
		40	int cmp = (encoded_op >> 24) & 15;
		41	int oparg = (encoded_op << 8) >> 20;
		42	int cmparg = (encoded_op << 20) >> 20;
		43	int oldval = 0, newval, ret;
		44	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
		45	oparg = 1 << oparg;
		46
		47	if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
		48	return -EFAULT;
		49
		50	inc_preempt_count();
		51
		52	switch (op) {
		53	case FUTEX_OP_SET:
		54	__futex_atomic_op("lr %2,%5\n",
		55	ret, oldval, newval, uaddr, oparg);
		56	break;
		57	case FUTEX_OP_ADD:
		58	__futex_atomic_op("lr %2,%1\nar %2,%5\n",
		59	ret, oldval, newval, uaddr, oparg);
		60	break;
		61	case FUTEX_OP_OR:
		62	__futex_atomic_op("lr %2,%1\nor %2,%5\n",
		63	ret, oldval, newval, uaddr, oparg);
		64	break;
		65	case FUTEX_OP_ANDN:
		66	__futex_atomic_op("lr %2,%1\nnr %2,%5\n",
		67	ret, oldval, newval, uaddr, oparg);
		68	break;
		69	case FUTEX_OP_XOR:
		70	__futex_atomic_op("lr %2,%1\nxr %2,%5\n",
		71	ret, oldval, newval, uaddr, oparg);
		72	break;
		73	default:
		74	ret = -ENOSYS;
		75	}
		76
		77	dec_preempt_count();
		78
		79	if (!ret) {
		80	switch (cmp) {
		81	case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
		82	case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
		83	case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
		84	case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
		85	case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
		86	case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
		87	default: ret = -ENOSYS;
		88	}
		89	}
		90	return ret;
		91	}
		92
		93	static inline int
		94	futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
		95	{
		96	int ret;
		97
		98	if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
		99	return -EFAULT;
		100	asm volatile(" cs %1,%4,0(%5)\n"
		101	"0: lr %0,%1\n"
		102	"1:\n"
		103	#ifndef __s390x__
		104	".section __ex_table,\"a\"\n"
		105	" .align 4\n"
		106	" .long 0b,1b\n"
		107	".previous"
		108	#else /* __s390x__ */
		109	".section __ex_table,\"a\"\n"
		110	" .align 8\n"
		111	" .quad 0b,1b\n"
		112	".previous"
		113	#endif /* __s390x__ */
		114	: "=d" (ret), "+d" (oldval), "=m" (*uaddr)
		115	: "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
		116	: "cc", "memory" );
		117	return oldval;
		118	}
		119
		120	#endif /* __KERNEL__ */
		121	#endif /* _ASM_S390_FUTEX_H */