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From: Max Filippov <jcmvbkbc@gmail.com>
To: linux-xtensa@linux-xtensa.org, Al Viro <viro@zeniv.linux.org.uk>
Cc: Chris Zankel <chris@zankel.net>,
	linux-kernel@vger.kernel.org, Max Filippov <jcmvbkbc@gmail.com>
Subject: [PATCH v2 2/4] xtensa: clean up assembly arguments in uaccess macros
Date: Fri, 11 Oct 2019 17:37:06 -0700	[thread overview]
Message-ID: <20191012003708.22182-3-jcmvbkbc@gmail.com> (raw)
In-Reply-To: <20191012003708.22182-1-jcmvbkbc@gmail.com>

Numeric assembly arguments are hard to understand and assembly code that
uses them is hard to modify. Use named arguments in __check_align_*,
__get_user_asm and __put_user_asm. Modify macro parameter names so that
they don't affect argument names.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
---
 arch/xtensa/include/asm/uaccess.h | 42 +++++++++++++++----------------
 1 file changed, 21 insertions(+), 21 deletions(-)

diff --git a/arch/xtensa/include/asm/uaccess.h b/arch/xtensa/include/asm/uaccess.h
index f568c00392ec..aca510707189 100644
--- a/arch/xtensa/include/asm/uaccess.h
+++ b/arch/xtensa/include/asm/uaccess.h
@@ -132,14 +132,14 @@ do {									\
 #define __check_align_1  ""
 
 #define __check_align_2				\
-	"   _bbci.l %3,  0, 1f		\n"	\
-	"   movi    %0, %4		\n"	\
+	"   _bbci.l %[addr], 0, 1f	\n"	\
+	"   movi    %[err], %[efault]	\n"	\
 	"   _j      2f			\n"
 
 #define __check_align_4				\
-	"   _bbsi.l %3,  0, 0f		\n"	\
-	"   _bbci.l %3,  1, 1f		\n"	\
-	"0: movi    %0, %4		\n"	\
+	"   _bbsi.l %[addr], 0, 0f	\n"	\
+	"   _bbci.l %[addr], 1, 1f	\n"	\
+	"0: movi    %[err], %[efault]	\n"	\
 	"   _j      2f			\n"
 
 
@@ -151,24 +151,24 @@ do {									\
  * WARNING: If you modify this macro at all, verify that the
  * __check_align_* macros still work.
  */
-#define __put_user_asm(x, addr, err, align, insn, cb)	\
+#define __put_user_asm(x_, addr_, err_, align, insn, cb)\
 __asm__ __volatile__(					\
 	__check_align_##align				\
-	"1: "insn"  %2, %3, 0		\n"		\
+	"1: "insn"  %[x], %[addr], 0	\n"		\
 	"2:				\n"		\
 	"   .section  .fixup,\"ax\"	\n"		\
 	"   .align 4			\n"		\
 	"   .literal_position		\n"		\
 	"5:				\n"		\
-	"   movi   %1, 2b		\n"		\
-	"   movi   %0, %4		\n"		\
-	"   jx     %1			\n"		\
+	"   movi   %[tmp], 2b		\n"		\
+	"   movi   %[err], %[efault]	\n"		\
+	"   jx     %[tmp]		\n"		\
 	"   .previous			\n"		\
 	"   .section  __ex_table,\"a\"	\n"		\
 	"   .long	1b, 5b		\n"		\
 	"   .previous"					\
-	:"=r" (err), "=r" (cb)				\
-	:"r" ((int)(x)), "r" (addr), "i" (-EFAULT), "0" (err))
+	:[err] "=r"(err_), [tmp] "=r"(cb)		\
+	:[x] "r"(x_), [addr] "r"(addr_), [efault] "i"(-EFAULT))
 
 #define __get_user_nocheck(x, ptr, size)			\
 ({								\
@@ -217,25 +217,25 @@ do {									\
  * WARNING: If you modify this macro at all, verify that the
  * __check_align_* macros still work.
  */
-#define __get_user_asm(x, addr, err, align, insn, cb) \
-__asm__ __volatile__(			\
+#define __get_user_asm(x_, addr_, err_, align, insn, cb) \
+__asm__ __volatile__(				\
 	__check_align_##align			\
-	"1: "insn"  %2, %3, 0		\n"	\
+	"1: "insn"  %[x], %[addr], 0	\n"	\
 	"2:				\n"	\
 	"   .section  .fixup,\"ax\"	\n"	\
 	"   .align 4			\n"	\
 	"   .literal_position		\n"	\
 	"5:				\n"	\
-	"   movi   %1, 2b		\n"	\
-	"   movi   %2, 0		\n"	\
-	"   movi   %0, %4		\n"	\
-	"   jx     %1			\n"	\
+	"   movi   %[tmp], 2b		\n"	\
+	"   movi   %[x], 0		\n"	\
+	"   movi   %[err], %[efault]	\n"	\
+	"   jx     %[tmp]		\n"	\
 	"   .previous			\n"	\
 	"   .section  __ex_table,\"a\"	\n"	\
 	"   .long	1b, 5b		\n"	\
 	"   .previous"				\
-	:"=r" (err), "=r" (cb), "=r" (x)	\
-	:"r" (addr), "i" (-EFAULT), "0" (err))
+	:[err] "=r"(err_), [tmp] "=r"(cb), [x] "=r"(x_)\
+	:[addr] "r"(addr_), [efault] "i"(-EFAULT))
 
 
 /*
-- 
2.20.1


  parent reply	other threads:[~2019-10-12  0:37 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-12  0:37 [PATCH v2 0/4] xtensa: fix {get,put}_user() for 64bit values Max Filippov
2019-10-12  0:37 ` [PATCH v2 1/4] " Max Filippov
2019-10-12  0:37 ` Max Filippov [this message]
2019-10-12  0:37 ` [PATCH v2 3/4] xtensa: fix type conversion in __get_user_[no]check Max Filippov
2019-10-12  0:37 ` [PATCH v2 4/4] xtensa: initialize result in __get_user_asm for unaligned access Max Filippov

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