mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-03 06:16:43 +07:00
09831ca734
Original port to early 2.6 kernel using TI COFF toolchain. Brought up to date by Mark Salter <msalter@redhat.com> Signed-off-by: Aurelien Jacquiot <a-jacquiot@ti.com> Signed-off-by: Mark Salter <msalter@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
83 lines
2.6 KiB
ArmAsm
83 lines
2.6 KiB
ArmAsm
;; Copyright 2010 Free Software Foundation, Inc.
|
|
;; Contributed by Bernd Schmidt <bernds@codesourcery.com>.
|
|
;;
|
|
;; This program 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.
|
|
;;
|
|
;; This program 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 General Public License for more details.
|
|
;;
|
|
;; You should have received a copy of the GNU General Public License
|
|
;; along with this program; if not, write to the Free Software
|
|
;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
|
|
#include <linux/linkage.h>
|
|
|
|
;; ABI considerations for the divide functions
|
|
;; The following registers are call-used:
|
|
;; __c6xabi_divi A0,A1,A2,A4,A6,B0,B1,B2,B4,B5
|
|
;; __c6xabi_divu A0,A1,A2,A4,A6,B0,B1,B2,B4
|
|
;; __c6xabi_remi A1,A2,A4,A5,A6,B0,B1,B2,B4
|
|
;; __c6xabi_remu A1,A4,A5,A7,B0,B1,B2,B4
|
|
;;
|
|
;; In our implementation, divu and remu are leaf functions,
|
|
;; while both divi and remi call into divu.
|
|
;; A0 is not clobbered by any of the functions.
|
|
;; divu does not clobber B2 either, which is taken advantage of
|
|
;; in remi.
|
|
;; divi uses B5 to hold the original return address during
|
|
;; the call to divu.
|
|
;; remi uses B2 and A5 to hold the input values during the
|
|
;; call to divu. It stores B3 in on the stack.
|
|
|
|
|
|
.text
|
|
|
|
ENTRY(__c6xabi_remu)
|
|
;; The ABI seems designed to prevent these functions calling each other,
|
|
;; so we duplicate most of the divsi3 code here.
|
|
mv .s2x A4, B1
|
|
lmbd .l2 1, B4, B1
|
|
|| [!B1] b .s2 B3 ; RETURN A
|
|
|| [!B1] mvk .d2 1, B4
|
|
|
|
mv .l1x B1, A7
|
|
|| shl .s2 B4, B1, B4
|
|
|
|
cmpltu .l1x A4, B4, A1
|
|
[!A1] sub .l1x A4, B4, A4
|
|
shru .s2 B4, 1, B4
|
|
|
|
_remu_loop:
|
|
cmpgt .l2 B1, 7, B0
|
|
|| [B1] subc .l1x A4,B4,A4
|
|
|| [B1] add .s2 -1, B1, B1
|
|
;; RETURN A may happen here (note: must happen before the next branch)
|
|
[B1] subc .l1x A4,B4,A4
|
|
|| [B1] add .s2 -1, B1, B1
|
|
|| [B0] b .s1 _remu_loop
|
|
[B1] subc .l1x A4,B4,A4
|
|
|| [B1] add .s2 -1, B1, B1
|
|
[B1] subc .l1x A4,B4,A4
|
|
|| [B1] add .s2 -1, B1, B1
|
|
[B1] subc .l1x A4,B4,A4
|
|
|| [B1] add .s2 -1, B1, B1
|
|
[B1] subc .l1x A4,B4,A4
|
|
|| [B1] add .s2 -1, B1, B1
|
|
[B1] subc .l1x A4,B4,A4
|
|
|| [B1] add .s2 -1, B1, B1
|
|
;; loop backwards branch happens here
|
|
|
|
ret .s2 B3
|
|
[B1] subc .l1x A4,B4,A4
|
|
|| [B1] add .s2 -1, B1, B1
|
|
[B1] subc .l1x A4,B4,A4
|
|
|
|
extu .s1 A4, A7, A4
|
|
nop 2
|
|
ENDPROC(__c6xabi_remu)
|