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authorLinus Torvalds <torvalds@linux-foundation.org>2021-09-18 14:45:48 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-09-18 14:45:48 -0700
commitd4d016caa4b85b9aa98d7ec8c84e928621a614bc (patch)
tree1eef0dcde02bb60b6c8183010b5eab5fc0dd8269 /arch/alpha/math-emu
parentab41f75ee6a06fa9b947a59c8f9de92370463e40 (diff)
downloadlinux-d4d016caa4b85b9aa98d7ec8c84e928621a614bc.tar.gz
alpha: move __udiv_qrnnd library function to arch/alpha/lib/
We already had the implementation for __udiv_qrnnd (unsigned divide for multi-precision arithmetic) as part of the alpha math emulation code. But you can disable the math emulation code - even if you shouldn't - and then the MPI code that actually wants this functionality (and is needed by various crypto functions) will fail to build. So move the extended-precision divide code to be a regular library function, just like all the regular division code is. That way ie is available regardless of math-emulation. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/alpha/math-emu')
-rw-r--r--arch/alpha/math-emu/Makefile2
-rw-r--r--arch/alpha/math-emu/math.c2
-rw-r--r--arch/alpha/math-emu/qrnnd.S163
3 files changed, 1 insertions, 166 deletions
diff --git a/arch/alpha/math-emu/Makefile b/arch/alpha/math-emu/Makefile
index 6eda0973e183..3206402a8792 100644
--- a/arch/alpha/math-emu/Makefile
+++ b/arch/alpha/math-emu/Makefile
@@ -7,4 +7,4 @@ ccflags-y := -w
obj-$(CONFIG_MATHEMU) += math-emu.o
-math-emu-objs := math.o qrnnd.o
+math-emu-objs := math.o
diff --git a/arch/alpha/math-emu/math.c b/arch/alpha/math-emu/math.c
index f7cef66af88d..4212258f3cfd 100644
--- a/arch/alpha/math-emu/math.c
+++ b/arch/alpha/math-emu/math.c
@@ -403,5 +403,3 @@ alpha_fp_emul_imprecise (struct pt_regs *regs, unsigned long write_mask)
egress:
return si_code;
}
-
-EXPORT_SYMBOL(__udiv_qrnnd);
diff --git a/arch/alpha/math-emu/qrnnd.S b/arch/alpha/math-emu/qrnnd.S
deleted file mode 100644
index d6373ec1bff9..000000000000
--- a/arch/alpha/math-emu/qrnnd.S
+++ /dev/null
@@ -1,163 +0,0 @@
- # Alpha 21064 __udiv_qrnnd
- # Copyright (C) 1992, 1994, 1995, 2000 Free Software Foundation, Inc.
-
- # This file is part of GCC.
-
- # The GNU MP Library is free software; you can redistribute it and/or modify
- # it under the terms of the GNU General Public License as published by
- # the Free Software Foundation; either version 2 of the License, or (at your
- # option) any later version.
-
- # In addition to the permissions in the GNU General Public License, the
- # Free Software Foundation gives you unlimited permission to link the
- # compiled version of this file with other programs, and to distribute
- # those programs without any restriction coming from the use of this
- # file. (The General Public License restrictions do apply in other
- # respects; for example, they cover modification of the file, and
- # distribution when not linked into another program.)
-
- # This file is distributed in the hope that it will be useful, but
- # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
- # License for more details.
-
- # You should have received a copy of the GNU General Public License
- # along with GCC; see the file COPYING. If not, write to the
- # Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- # MA 02111-1307, USA.
-
- .set noreorder
- .set noat
-
- .text
-
- .globl __udiv_qrnnd
- .ent __udiv_qrnnd
-__udiv_qrnnd:
- .frame $30,0,$26,0
- .prologue 0
-
-#define cnt $2
-#define tmp $3
-#define rem_ptr $16
-#define n1 $17
-#define n0 $18
-#define d $19
-#define qb $20
-#define AT $at
-
- ldiq cnt,16
- blt d,$largedivisor
-
-$loop1: cmplt n0,0,tmp
- addq n1,n1,n1
- bis n1,tmp,n1
- addq n0,n0,n0
- cmpule d,n1,qb
- subq n1,d,tmp
- cmovne qb,tmp,n1
- bis n0,qb,n0
- cmplt n0,0,tmp
- addq n1,n1,n1
- bis n1,tmp,n1
- addq n0,n0,n0
- cmpule d,n1,qb
- subq n1,d,tmp
- cmovne qb,tmp,n1
- bis n0,qb,n0
- cmplt n0,0,tmp
- addq n1,n1,n1
- bis n1,tmp,n1
- addq n0,n0,n0
- cmpule d,n1,qb
- subq n1,d,tmp
- cmovne qb,tmp,n1
- bis n0,qb,n0
- cmplt n0,0,tmp
- addq n1,n1,n1
- bis n1,tmp,n1
- addq n0,n0,n0
- cmpule d,n1,qb
- subq n1,d,tmp
- cmovne qb,tmp,n1
- bis n0,qb,n0
- subq cnt,1,cnt
- bgt cnt,$loop1
- stq n1,0(rem_ptr)
- bis $31,n0,$0
- ret $31,($26),1
-
-$largedivisor:
- and n0,1,$4
-
- srl n0,1,n0
- sll n1,63,tmp
- or tmp,n0,n0
- srl n1,1,n1
-
- and d,1,$6
- srl d,1,$5
- addq $5,$6,$5
-
-$loop2: cmplt n0,0,tmp
- addq n1,n1,n1
- bis n1,tmp,n1
- addq n0,n0,n0
- cmpule $5,n1,qb
- subq n1,$5,tmp
- cmovne qb,tmp,n1
- bis n0,qb,n0
- cmplt n0,0,tmp
- addq n1,n1,n1
- bis n1,tmp,n1
- addq n0,n0,n0
- cmpule $5,n1,qb
- subq n1,$5,tmp
- cmovne qb,tmp,n1
- bis n0,qb,n0
- cmplt n0,0,tmp
- addq n1,n1,n1
- bis n1,tmp,n1
- addq n0,n0,n0
- cmpule $5,n1,qb
- subq n1,$5,tmp
- cmovne qb,tmp,n1
- bis n0,qb,n0
- cmplt n0,0,tmp
- addq n1,n1,n1
- bis n1,tmp,n1
- addq n0,n0,n0
- cmpule $5,n1,qb
- subq n1,$5,tmp
- cmovne qb,tmp,n1
- bis n0,qb,n0
- subq cnt,1,cnt
- bgt cnt,$loop2
-
- addq n1,n1,n1
- addq $4,n1,n1
- bne $6,$Odd
- stq n1,0(rem_ptr)
- bis $31,n0,$0
- ret $31,($26),1
-
-$Odd:
- /* q' in n0. r' in n1 */
- addq n1,n0,n1
-
- cmpult n1,n0,tmp # tmp := carry from addq
- subq n1,d,AT
- addq n0,tmp,n0
- cmovne tmp,AT,n1
-
- cmpult n1,d,tmp
- addq n0,1,AT
- cmoveq tmp,AT,n0
- subq n1,d,AT
- cmoveq tmp,AT,n1
-
- stq n1,0(rem_ptr)
- bis $31,n0,$0
- ret $31,($26),1
-
- .end __udiv_qrnnd