mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 03:46:38 +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>
65 lines
2.0 KiB
ArmAsm
65 lines
2.0 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_remi)
|
|
stw .d2t2 B3, *B15--[2]
|
|
|| cmpgt .l1 0, A4, A1
|
|
|| cmpgt .l2 0, B4, B2
|
|
|| mv .s1 A4, A5
|
|
|| call .s2 __c6xabi_divu
|
|
|
|
[A1] neg .l1 A4, A4
|
|
|| [B2] neg .l2 B4, B4
|
|
|| xor .s2x B2, A1, B0
|
|
|| mv .d2 B4, B2
|
|
|
|
[B0] addkpc .s2 _divu_ret_1, B3, 1
|
|
[!B0] addkpc .s2 _divu_ret_2, B3, 1
|
|
nop 2
|
|
_divu_ret_1:
|
|
neg .l1 A4, A4
|
|
_divu_ret_2:
|
|
ldw .d2t2 *++B15[2], B3
|
|
|
|
mpy32 .m1x A4, B2, A6
|
|
nop 3
|
|
ret .s2 B3
|
|
sub .l1 A5, A6, A4
|
|
nop 4
|
|
ENDPROC(__c6xabi_remi)
|