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RISC-V: Remove udivdi3

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This should never have landed in the first place: it was added as part
of 64-bit divide support for 32-bit systems, but the kernel doesn't
allow this sort of division.  I must have forgotten to remove it.

This patch removes the support.  Since this routine only worked on
64-bit platforms but was only built on 32-bit platforms, it's
essentially just nonsense anyway.

Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Link: https://lore.kernel.org/linux-riscv/nycvar.YSQ.7.76.1908061413360.19480@knanqh.ubzr/T/#t
Reported-by: Eric Lin <tesheng@andestech.com>
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
This commit is contained in:
Palmer Dabbelt 2019-08-06 17:05:08 -07:00 committed by Paul Walmsley
parent 66cc016ab7
commit 81a48ee417
2 changed files with 0 additions and 34 deletions
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2
arch/riscv/lib/Makefile
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@ -5,5 +5,3 @@ lib-y += memset.o
lib-y += uaccess.o
lib-$(CONFIG_64BIT) += tishift.o
lib-$(CONFIG_32BIT) += udivdi3.o

32
arch/riscv/lib/udivdi3.S
View File

@ -1,32 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2016-2017 Free Software Foundation, Inc.
*/
#include <linux/linkage.h>
ENTRY(__udivdi3)
mv a2, a1
mv a1, a0
li a0, -1
beqz a2, .L5
li a3, 1
bgeu a2, a1, .L2
.L1:
blez a2, .L2
slli a2, a2, 1
slli a3, a3, 1
bgtu a1, a2, .L1
.L2:
li a0, 0
.L3:
bltu a1, a2, .L4
sub a1, a1, a2
or a0, a0, a3
.L4:
srli a3, a3, 1
srli a2, a2, 1
bnez a3, .L3
.L5:
ret
ENDPROC(__udivdi3)