From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/arch/c6x/lib/remi.S | 64 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 kernel/arch/c6x/lib/remi.S (limited to 'kernel/arch/c6x/lib/remi.S') diff --git a/kernel/arch/c6x/lib/remi.S b/kernel/arch/c6x/lib/remi.S new file mode 100644 index 000000000..6f2ca18c3 --- /dev/null +++ b/kernel/arch/c6x/lib/remi.S @@ -0,0 +1,64 @@ +;; Copyright 2010 Free Software Foundation, Inc. +;; Contributed by Bernd Schmidt . +;; +;; 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 + + ;; 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) -- cgit 1.2.3-korg