xtensa: clean up word alignment macros in assembly code

Remove duplicate definitions of ALIGN/src_b/__src_b and SSA8/ssa8/__ssa8
from assembly sources and put single definition into asm/asmmacro.h
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

arch/xtensa/include/asm/asmmacro.h

@@ -158,4 +158,37 @@
 	.previous				\
 97:
 
+
+/*
+ * Extract unaligned word that is split between two registers w0 and w1
+ * into r regardless of machine endianness. SAR must be loaded with the
+ * starting bit of the word (see __ssa8).
+ */
+
+	.macro __src_b	r, w0, w1
+#ifdef __XTENSA_EB__
+		src	\r, \w0, \w1
+#else
+		src	\r, \w1, \w0
+#endif
+	.endm
+
+/*
+ * Load 2 lowest address bits of r into SAR for __src_b to extract unaligned
+ * word starting at r from two registers loaded from consecutive aligned
+ * addresses covering r regardless of machine endianness.
+ *
+ *      r   0   1   2   3
+ * LE SAR   0   8  16  24
+ * BE SAR  32  24  16   8
+ */
+
+	.macro __ssa8	r
+#ifdef __XTENSA_EB__
+		ssa8b	\r
+#else
+		ssa8l	\r
+#endif
+	.endm
+
 #endif /* _XTENSA_ASMMACRO_H */

arch/xtensa/kernel/align.S

@@ -19,6 +19,7 @@
 #include <linux/linkage.h>
 #include <asm/current.h>
 #include <asm/asm-offsets.h>
+#include <asm/asmmacro.h>
 #include <asm/processor.h>
 
 #if XCHAL_UNALIGNED_LOAD_EXCEPTION || XCHAL_UNALIGNED_STORE_EXCEPTION
@@ -66,8 +67,6 @@
 #define	INSN_T		24
 #define	INSN_OP1	16
 
-.macro __src_b	r, w0, w1;	src	\r, \w0, \w1;	.endm
-.macro __ssa8	r;		ssa8b	\r;		.endm
 .macro __ssa8r	r;		ssa8l	\r;		.endm
 .macro __sh	r, s;		srl	\r, \s;		.endm
 .macro __sl	r, s;		sll	\r, \s;		.endm
@@ -81,8 +80,6 @@
 #define	INSN_T		4
 #define	INSN_OP1	12
 
-.macro __src_b	r, w0, w1;	src	\r, \w1, \w0;	.endm
-.macro __ssa8	r;		ssa8l	\r;		.endm
 .macro __ssa8r	r;		ssa8b	\r;		.endm
 .macro __sh	r, s;		sll	\r, \s;		.endm
 .macro __sl	r, s;		srl	\r, \s;		.endm

arch/xtensa/lib/memcopy.S

@@ -10,22 +10,7 @@
  */
 
 #include <variant/core.h>
-
-	.macro	src_b	r, w0, w1
-#ifdef __XTENSA_EB__
-	src	\r, \w0, \w1
-#else
-	src	\r, \w1, \w0
-#endif
-	.endm
-
-	.macro	ssa8	r
-#ifdef __XTENSA_EB__
-	ssa8b	\r
-#else
-	ssa8l	\r
-#endif
-	.endm
+#include <asm/asmmacro.h>
 
 /*
  * void *memcpy(void *dst, const void *src, size_t len);
@@ -209,7 +194,7 @@ memcpy:
 .Lsrcunaligned:
 	_beqz	a4, .Ldone	# avoid loading anything for zero-length copies
 	# copy 16 bytes per iteration for word-aligned dst and unaligned src
-	ssa8	a3		# set shift amount from byte offset
+	__ssa8	a3		# set shift amount from byte offset
 
 /* set to 1 when running on ISS (simulator) with the
    lint or ferret client, or 0 to save a few cycles */
@@ -229,16 +214,16 @@ memcpy:
 .Loop2:
 	l32i	a7, a3,  4
 	l32i	a8, a3,  8
-	src_b	a6, a6, a7
+	__src_b	a6, a6, a7
 	s32i	a6, a5,  0
 	l32i	a9, a3, 12
-	src_b	a7, a7, a8
+	__src_b	a7, a7, a8
 	s32i	a7, a5,  4
 	l32i	a6, a3, 16
-	src_b	a8, a8, a9
+	__src_b	a8, a8, a9
 	s32i	a8, a5,  8
 	addi	a3, a3, 16
-	src_b	a9, a9, a6
+	__src_b	a9, a9, a6
 	s32i	a9, a5, 12
 	addi	a5, a5, 16
 #if !XCHAL_HAVE_LOOPS
@@ -249,10 +234,10 @@ memcpy:
 	# copy 8 bytes
 	l32i	a7, a3,  4
 	l32i	a8, a3,  8
-	src_b	a6, a6, a7
+	__src_b	a6, a6, a7
 	s32i	a6, a5,  0
 	addi	a3, a3,  8
-	src_b	a7, a7, a8
+	__src_b	a7, a7, a8
 	s32i	a7, a5,  4
 	addi	a5, a5,  8
 	mov	a6, a8
@@ -261,7 +246,7 @@ memcpy:
 	# copy 4 bytes
 	l32i	a7, a3,  4
 	addi	a3, a3,  4
-	src_b	a6, a6, a7
+	__src_b	a6, a6, a7
 	s32i	a6, a5,  0
 	addi	a5, a5,  4
 	mov	a6, a7
@@ -485,7 +470,7 @@ memmove:
 .Lbacksrcunaligned:
 	_beqz	a4, .Lbackdone	# avoid loading anything for zero-length copies
 	# copy 16 bytes per iteration for word-aligned dst and unaligned src
-	ssa8	a3		# set shift amount from byte offset
+	__ssa8	a3		# set shift amount from byte offset
 #define SIM_CHECKS_ALIGNMENT	1	/* set to 1 when running on ISS with
 					 * the lint or ferret client, or 0
 					 * to save a few cycles */
@@ -506,15 +491,15 @@ memmove:
 	l32i	a7, a3, 12
 	l32i	a8, a3,  8
 	addi	a5, a5, -16
-	src_b	a6, a7, a6
+	__src_b	a6, a7, a6
 	s32i	a6, a5, 12
 	l32i	a9, a3,  4
-	src_b	a7, a8, a7
+	__src_b	a7, a8, a7
 	s32i	a7, a5,  8
 	l32i	a6, a3,  0
-	src_b	a8, a9, a8
+	__src_b	a8, a9, a8
 	s32i	a8, a5,  4
-	src_b	a9, a6, a9
+	__src_b	a9, a6, a9
 	s32i	a9, a5,  0
 #if !XCHAL_HAVE_LOOPS
 	bne	a3, a10, .backLoop2 # continue loop if a3:src != a10:src_start
@@ -526,9 +511,9 @@ memmove:
 	l32i	a7, a3,  4
 	l32i	a8, a3,  0
 	addi	a5, a5, -8
-	src_b	a6, a7, a6
+	__src_b	a6, a7, a6
 	s32i	a6, a5,  4
-	src_b	a7, a8, a7
+	__src_b	a7, a8, a7
 	s32i	a7, a5,  0
 	mov	a6, a8
 .Lback12:
@@ -537,7 +522,7 @@ memmove:
 	addi	a3, a3, -4
 	l32i	a7, a3,  0
 	addi	a5, a5, -4
-	src_b	a6, a7, a6
+	__src_b	a6, a7, a6
 	s32i	a6, a5,  0
 	mov	a6, a7
 .Lback13:

arch/xtensa/lib/usercopy.S

@@ -56,14 +56,6 @@
 #include <variant/core.h>
 #include <asm/asmmacro.h>
 
-#ifdef __XTENSA_EB__
-#define ALIGN(R, W0, W1) src	R, W0, W1
-#define SSA8(R)	ssa8b R
-#else
-#define ALIGN(R, W0, W1) src	R, W1, W0
-#define SSA8(R)	ssa8l R
-#endif
-
 	.text
 	.align	4
 	.global	__xtensa_copy_user
@@ -81,7 +73,7 @@ __xtensa_copy_user:
 				# per iteration
 	movi	a8, 3		  # if source is also aligned,
 	bnone	a3, a8, .Laligned # then use word copy
-	SSA8(	a3)		# set shift amount from byte offset
+	__ssa8	a3		# set shift amount from byte offset
 	bnez	a4, .Lsrcunaligned
 	movi	a2, 0		# return success for len==0
 	retw
@@ -220,16 +212,16 @@ EX(10f)	l32i	a6, a3, 0	# load first word
 .Loop2:
 EX(10f)	l32i	a7, a3,  4
 EX(10f)	l32i	a8, a3,  8
-	ALIGN(	a6, a6, a7)
+	__src_b	a6, a6, a7
 EX(10f)	s32i	a6, a5,  0
 EX(10f)	l32i	a9, a3, 12
-	ALIGN(	a7, a7, a8)
+	__src_b	a7, a7, a8
 EX(10f)	s32i	a7, a5,  4
 EX(10f)	l32i	a6, a3, 16
-	ALIGN(	a8, a8, a9)
+	__src_b	a8, a8, a9
 EX(10f)	s32i	a8, a5,  8
 	addi	a3, a3, 16
-	ALIGN(	a9, a9, a6)
+	__src_b	a9, a9, a6
 EX(10f)	s32i	a9, a5, 12
 	addi	a5, a5, 16
 #if !XCHAL_HAVE_LOOPS
@@ -240,10 +232,10 @@ EX(10f)	s32i	a9, a5, 12
 	# copy 8 bytes
 EX(10f)	l32i	a7, a3,  4
 EX(10f)	l32i	a8, a3,  8
-	ALIGN(	a6, a6, a7)
+	__src_b	a6, a6, a7
 EX(10f)	s32i	a6, a5,  0
 	addi	a3, a3,  8
-	ALIGN(	a7, a7, a8)
+	__src_b	a7, a7, a8
 EX(10f)	s32i	a7, a5,  4
 	addi	a5, a5,  8
 	mov	a6, a8
@@ -252,7 +244,7 @@ EX(10f)	s32i	a7, a5,  4
 	# copy 4 bytes
 EX(10f)	l32i	a7, a3,  4
 	addi	a3, a3,  4
-	ALIGN(	a6, a6, a7)
+	__src_b	a6, a6, a7
 EX(10f)	s32i	a6, a5,  0
 	addi	a5, a5,  4
 	mov	a6, a7