arm: lib: import muldi3.S from Linux

Import muldi3.S from Linux 4.4.6 , commit 0d1912303e54ed1b2a371be0bba51c384dd57326
on arm32. This file implements __aeabi_lmul and it's alias __muldi3, which
is needed when doing Thumb1 builds.

This patch also defines CONFIG_THUMB2_KERNEL and CONFIG_ARM_ASM_UNIFIED
which is necessary for correct build of these files both in ARM and
Thumb mode, just like Linux does.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Tom Rini <trini@konsulko.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index de933ab66d077f064a4ddf7798558b5a9501940a..0e05e87deafcb7581a6cc1c8def80fd2ec98fa6b 100644 (file)
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile
@@ -6,7 +6,8 @@
 #
 
 lib-$(CONFIG_USE_PRIVATE_LIBGCC) += ashldi3.o ashrdi3.o lshrdi3.o \
-                                   lib1funcs.o uldivmod.o div0.o div64.o
+                                   lib1funcs.o uldivmod.o div0.o \
+                                   div64.o muldi3.o
 
 ifdef CONFIG_CPU_V7M
 obj-y  += vectors_m.o crt0.o

diff --git a/arch/arm/lib/muldi3.S b/arch/arm/lib/muldi3.S
new file mode 100644 (file)
index 0000000..daa5704
--- /dev/null
+++ b/arch/arm/lib/muldi3.S
@@ -0,0 +1,46 @@
+/*
+ *  linux/arch/arm/lib/muldi3.S
+ *
+ *  Author:     Nicolas Pitre
+ *  Created:    Oct 19, 2005
+ *  Copyright:  Monta Vista Software, Inc.
+ *
+ *  SPDX-License-Identifier:   GPL-2.0
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+#ifdef __ARMEB__
+#define xh r0
+#define xl r1
+#define yh r2
+#define yl r3
+#else
+#define xl r0
+#define xh r1
+#define yl r2
+#define yh r3
+#endif
+
+ENTRY(__muldi3)
+ENTRY(__aeabi_lmul)
+
+       mul     xh, yl, xh
+       mla     xh, xl, yh, xh
+       mov     ip, xl, lsr #16
+       mov     yh, yl, lsr #16
+       bic     xl, xl, ip, lsl #16
+       bic     yl, yl, yh, lsl #16
+       mla     xh, yh, ip, xh
+       mul     yh, xl, yh
+       mul     xl, yl, xl
+       mul     ip, yl, ip
+       adds    xl, xl, yh, lsl #16
+       adc     xh, xh, yh, lsr #16
+       adds    xl, xl, ip, lsl #16
+       adc     xh, xh, ip, lsr #16
+       ret     lr
+
+ENDPROC(__muldi3)
+ENDPROC(__aeabi_lmul)