Re: [U-Boot] [PATCH 09/12] arm: lib: import muldi3.S from Linux

[Tom Rini]

On Thu, May 26, 2016 at 06:01:44PM +0200, Marek Vasut wrote:

> 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 
> Cc: Albert Aribaud 
> Cc: Masahiro Yamada 
> Cc: Simon Glass 
> Cc: Tom Rini 

Reviewed-by: Tom Rini 

-- 
Tom


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[U-Boot] [PATCH 09/12] arm: lib: import muldi3.S from Linux

[Marek Vasut]

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 
Cc: Albert Aribaud 
Cc: Masahiro Yamada 
Cc: Simon Glass 
Cc: Tom Rini 
---
 arch/arm/lib/Makefile |  3 ++-
 arch/arm/lib/muldi3.S | 46 ++
 2 files changed, 48 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm/lib/muldi3.S

diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index 8945915..86489fd 100644
--- 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
index 000..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 
+#include 
+
+#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
+   addsxl, xl, yh, lsl #16
+   adc xh, xh, yh, lsr #16
+   addsxl, xl, ip, lsl #16
+   adc xh, xh, ip, lsr #16
+   ret lr
+
+ENDPROC(__muldi3)
+ENDPROC(__aeabi_lmul)
-- 
2.7.0

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