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Message-Id: <20210302162148.3800079-1-geert+renesas@glider.be>
Date: Tue, 2 Mar 2021 17:21:48 +0100
From: Geert Uytterhoeven <geert+renesas@...der.be>
To: Yoshinori Sato <ysato@...rs.sourceforge.jp>,
Rich Felker <dalias@...c.org>
Cc: Masahiro Yamada <masahiroy@...nel.org>,
John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
Arnd Bergmann <arnd@...db.de>,
Palmer Dabbelt <palmer@...belt.com>, linux-sh@...r.kernel.org,
linux-kernel@...r.kernel.org,
Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH v2] sh: Use generic GCC library routines
The C implementations of __ashldi3(), __ashrdi3__(), and __lshrdi3() in
arch/sh/lib/ are identical to the generic C implementations in lib/.
Reduce duplication by switching SH to the generic versions.
Update the include path in arch/sh/boot/compressed accordingly.
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
v2:
- Fix silly typo in subject.
Against sh/for-next, tested on landisk and qemu/rts7751r2d.
Note that it also works without the change to arch/sh/boot/compressed/,
as lib/ashldi3.c can be reached via both include/uapi/../../lib/ashldi3.c
and arch/sh/boot/compressed/../../../../lib/ashldi3.c.
Palmer tried a similar thing before:
https://lore.kernel.org/linux-arch/20170523220546.16758-1-palmer@dabbelt.com/
but initially it broke the SH build due to a missing change to
arch/sh/boot/compressed/, and the later update never got picked up.
In the mean time, arch/sh/boot/compressed/ was changed, so his patch no
longer applies.
Similar for the other architectures, I guess?
---
arch/sh/Kconfig | 3 +++
arch/sh/boot/compressed/ashldi3.c | 4 ++--
arch/sh/lib/Makefile | 4 +---
arch/sh/lib/ashldi3.c | 30 -----------------------------
arch/sh/lib/ashrdi3.c | 32 -------------------------------
arch/sh/lib/lshrdi3.c | 30 -----------------------------
6 files changed, 6 insertions(+), 97 deletions(-)
delete mode 100644 arch/sh/lib/ashldi3.c
delete mode 100644 arch/sh/lib/ashrdi3.c
delete mode 100644 arch/sh/lib/lshrdi3.c
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index e798e55915c2337f..468e475c02d184bd 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -19,6 +19,9 @@ config SUPERH
select GENERIC_CMOS_UPDATE if SH_SH03 || SH_DREAMCAST
select GENERIC_IDLE_POLL_SETUP
select GENERIC_IRQ_SHOW
+ select GENERIC_LIB_ASHLDI3
+ select GENERIC_LIB_ASHRDI3
+ select GENERIC_LIB_LSHRDI3
select GENERIC_PCI_IOMAP if PCI
select GENERIC_SCHED_CLOCK
select GENERIC_STRNCPY_FROM_USER
diff --git a/arch/sh/boot/compressed/ashldi3.c b/arch/sh/boot/compressed/ashldi3.c
index 7cebd646df839b48..7c12121702309e8c 100644
--- a/arch/sh/boot/compressed/ashldi3.c
+++ b/arch/sh/boot/compressed/ashldi3.c
@@ -1,2 +1,2 @@
-// SPDX-License-Identifier: GPL-2.0-only
-#include "../../lib/ashldi3.c"
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include "../../../../lib/ashldi3.c"
diff --git a/arch/sh/lib/Makefile b/arch/sh/lib/Makefile
index eb473d373ca43a4b..d20a0768b31fa2b6 100644
--- a/arch/sh/lib/Makefile
+++ b/arch/sh/lib/Makefile
@@ -7,9 +7,7 @@ lib-y = delay.o memmove.o memchr.o \
checksum.o strlen.o div64.o div64-generic.o
# Extracted from libgcc
-obj-y += movmem.o ashldi3.o ashrdi3.o lshrdi3.o \
- ashlsi3.o ashrsi3.o ashiftrt.o lshrsi3.o \
- udiv_qrnnd.o
+obj-y += movmem.o ashlsi3.o ashrsi3.o ashiftrt.o lshrsi3.o udiv_qrnnd.o
udivsi3-y := udivsi3_i4i-Os.o
diff --git a/arch/sh/lib/ashldi3.c b/arch/sh/lib/ashldi3.c
deleted file mode 100644
index e5afe0935847427f..0000000000000000
--- a/arch/sh/lib/ashldi3.c
+++ /dev/null
@@ -1,30 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/module.h>
-
-#include "libgcc.h"
-
-long long __ashldi3(long long u, word_type b)
-{
- DWunion uu, w;
- word_type bm;
-
- if (b == 0)
- return u;
-
- uu.ll = u;
- bm = 32 - b;
-
- if (bm <= 0) {
- w.s.low = 0;
- w.s.high = (unsigned int) uu.s.low << -bm;
- } else {
- const unsigned int carries = (unsigned int) uu.s.low >> bm;
-
- w.s.low = (unsigned int) uu.s.low << b;
- w.s.high = ((unsigned int) uu.s.high << b) | carries;
- }
-
- return w.ll;
-}
-
-EXPORT_SYMBOL(__ashldi3);
diff --git a/arch/sh/lib/ashrdi3.c b/arch/sh/lib/ashrdi3.c
deleted file mode 100644
index ae263fbf25383b70..0000000000000000
--- a/arch/sh/lib/ashrdi3.c
+++ /dev/null
@@ -1,32 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/module.h>
-
-#include "libgcc.h"
-
-long long __ashrdi3(long long u, word_type b)
-{
- DWunion uu, w;
- word_type bm;
-
- if (b == 0)
- return u;
-
- uu.ll = u;
- bm = 32 - b;
-
- if (bm <= 0) {
- /* w.s.high = 1..1 or 0..0 */
- w.s.high =
- uu.s.high >> 31;
- w.s.low = uu.s.high >> -bm;
- } else {
- const unsigned int carries = (unsigned int) uu.s.high << bm;
-
- w.s.high = uu.s.high >> b;
- w.s.low = ((unsigned int) uu.s.low >> b) | carries;
- }
-
- return w.ll;
-}
-
-EXPORT_SYMBOL(__ashrdi3);
diff --git a/arch/sh/lib/lshrdi3.c b/arch/sh/lib/lshrdi3.c
deleted file mode 100644
index 33eaa1edbc3c0656..0000000000000000
--- a/arch/sh/lib/lshrdi3.c
+++ /dev/null
@@ -1,30 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/module.h>
-
-#include "libgcc.h"
-
-long long __lshrdi3(long long u, word_type b)
-{
- DWunion uu, w;
- word_type bm;
-
- if (b == 0)
- return u;
-
- uu.ll = u;
- bm = 32 - b;
-
- if (bm <= 0) {
- w.s.high = 0;
- w.s.low = (unsigned int) uu.s.high >> -bm;
- } else {
- const unsigned int carries = (unsigned int) uu.s.high << bm;
-
- w.s.high = (unsigned int) uu.s.high >> b;
- w.s.low = ((unsigned int) uu.s.low >> b) | carries;
- }
-
- return w.ll;
-}
-
-EXPORT_SYMBOL(__lshrdi3);
--
2.25.1
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