From d3ba2e922d4d1d61806fcb6e09512d2bee734d06 Mon Sep 17 00:00:00 2001
From: James Hogan <james.hogan@imgtec.com>
Date: Fri, 31 Mar 2017 15:40:52 +0100
Subject: [PATCH] metag/usercopy: Add 64-bit get_user support

Metag already supports 64-bit put_user, so add support for 64-bit
get_user too so that the test_user_copy module can test both.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-metag@vger.kernel.org
---
 arch/metag/include/asm/uaccess.h |  9 +++++++--
 arch/metag/lib/usercopy.c        | 24 ++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/arch/metag/include/asm/uaccess.h b/arch/metag/include/asm/uaccess.h
index 07238b39638c..469a2f1393d3 100644
--- a/arch/metag/include/asm/uaccess.h
+++ b/arch/metag/include/asm/uaccess.h
@@ -138,7 +138,8 @@ extern long __get_user_bad(void);
 
 #define __get_user_nocheck(x, ptr, size)			\
 ({                                                              \
-	long __gu_err, __gu_val;                                \
+	long __gu_err;						\
+	long long __gu_val;					\
 	__get_user_size(__gu_val, (ptr), (size), __gu_err);	\
 	(x) = (__force __typeof__(*(ptr)))__gu_val;             \
 	__gu_err;                                               \
@@ -146,7 +147,8 @@ extern long __get_user_bad(void);
 
 #define __get_user_check(x, ptr, size)					\
 ({                                                                      \
-	long __gu_err = -EFAULT, __gu_val = 0;                          \
+	long __gu_err = -EFAULT;					\
+	long long __gu_val = 0;						\
 	const __typeof__(*(ptr)) __user *__gu_addr = (ptr);		\
 	if (access_ok(VERIFY_READ, __gu_addr, size))			\
 		__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\
@@ -157,6 +159,7 @@ extern long __get_user_bad(void);
 extern unsigned char __get_user_asm_b(const void __user *addr, long *err);
 extern unsigned short __get_user_asm_w(const void __user *addr, long *err);
 extern unsigned int __get_user_asm_d(const void __user *addr, long *err);
+extern unsigned long long __get_user_asm_l(const void __user *addr, long *err);
 
 #define __get_user_size(x, ptr, size, retval)			\
 do {                                                            \
@@ -168,6 +171,8 @@ do {                                                            \
 		x = __get_user_asm_w(ptr, &retval); break;	\
 	case 4:							\
 		x = __get_user_asm_d(ptr, &retval); break;	\
+	case 8:							\
+		x = __get_user_asm_l(ptr, &retval); break;	\
 	default:						\
 		(x) = __get_user_bad();				\
 	}                                                       \
diff --git a/arch/metag/lib/usercopy.c b/arch/metag/lib/usercopy.c
index ceb4590fbca5..45e7b79eca19 100644
--- a/arch/metag/lib/usercopy.c
+++ b/arch/metag/lib/usercopy.c
@@ -1044,6 +1044,30 @@ unsigned int __get_user_asm_d(const void __user *addr, long *err)
 }
 EXPORT_SYMBOL(__get_user_asm_d);
 
+unsigned long long __get_user_asm_l(const void __user *addr, long *err)
+{
+	register unsigned long long x asm ("D0Re0") = 0;
+	asm volatile (
+		"	GETL %0,%t0,[%2]\n"
+		"1:\n"
+		"	GETL %0,%t0,[%2]\n"
+		"2:\n"
+		"	.section .fixup,\"ax\"\n"
+		"3:	MOV     D0FrT,%3\n"
+		"	SETD    [%1],D0FrT\n"
+		"	MOVT    D0FrT,#HI(2b)\n"
+		"	JUMP    D0FrT,#LO(2b)\n"
+		"	.previous\n"
+		"	.section __ex_table,\"a\"\n"
+		"	.long 1b,3b\n"
+		"	.previous\n"
+		: "=r" (x)
+		: "r" (err), "r" (addr), "P" (-EFAULT)
+		: "D0FrT");
+	return x;
+}
+EXPORT_SYMBOL(__get_user_asm_l);
+
 long __put_user_asm_b(unsigned int x, void __user *addr)
 {
 	register unsigned int err asm ("D0Re0") = 0;