1*4882a593Smuzhiyun;; SPDX-License-Identifier: GPL-2.0-or-later 2*4882a593Smuzhiyun;; Copyright 2010 Free Software Foundation, Inc. 3*4882a593Smuzhiyun;; Contributed by Bernd Schmidt <bernds@codesourcery.com>. 4*4882a593Smuzhiyun;; 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun#include <linux/linkage.h> 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun ;; ABI considerations for the divide functions 9*4882a593Smuzhiyun ;; The following registers are call-used: 10*4882a593Smuzhiyun ;; __c6xabi_divi A0,A1,A2,A4,A6,B0,B1,B2,B4,B5 11*4882a593Smuzhiyun ;; __c6xabi_divu A0,A1,A2,A4,A6,B0,B1,B2,B4 12*4882a593Smuzhiyun ;; __c6xabi_remi A1,A2,A4,A5,A6,B0,B1,B2,B4 13*4882a593Smuzhiyun ;; __c6xabi_remu A1,A4,A5,A7,B0,B1,B2,B4 14*4882a593Smuzhiyun ;; 15*4882a593Smuzhiyun ;; In our implementation, divu and remu are leaf functions, 16*4882a593Smuzhiyun ;; while both divi and remi call into divu. 17*4882a593Smuzhiyun ;; A0 is not clobbered by any of the functions. 18*4882a593Smuzhiyun ;; divu does not clobber B2 either, which is taken advantage of 19*4882a593Smuzhiyun ;; in remi. 20*4882a593Smuzhiyun ;; divi uses B5 to hold the original return address during 21*4882a593Smuzhiyun ;; the call to divu. 22*4882a593Smuzhiyun ;; remi uses B2 and A5 to hold the input values during the 23*4882a593Smuzhiyun ;; call to divu. It stores B3 in on the stack. 24*4882a593Smuzhiyun 25*4882a593Smuzhiyun .text 26*4882a593Smuzhiyun 27*4882a593SmuzhiyunENTRY(__c6xabi_remi) 28*4882a593Smuzhiyun stw .d2t2 B3, *B15--[2] 29*4882a593Smuzhiyun|| cmpgt .l1 0, A4, A1 30*4882a593Smuzhiyun|| cmpgt .l2 0, B4, B2 31*4882a593Smuzhiyun|| mv .s1 A4, A5 32*4882a593Smuzhiyun|| call .s2 __c6xabi_divu 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun [A1] neg .l1 A4, A4 35*4882a593Smuzhiyun|| [B2] neg .l2 B4, B4 36*4882a593Smuzhiyun|| xor .s2x B2, A1, B0 37*4882a593Smuzhiyun|| mv .d2 B4, B2 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun [B0] addkpc .s2 _divu_ret_1, B3, 1 40*4882a593Smuzhiyun [!B0] addkpc .s2 _divu_ret_2, B3, 1 41*4882a593Smuzhiyun nop 2 42*4882a593Smuzhiyun_divu_ret_1: 43*4882a593Smuzhiyun neg .l1 A4, A4 44*4882a593Smuzhiyun_divu_ret_2: 45*4882a593Smuzhiyun ldw .d2t2 *++B15[2], B3 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun mpy32 .m1x A4, B2, A6 48*4882a593Smuzhiyun nop 3 49*4882a593Smuzhiyun ret .s2 B3 50*4882a593Smuzhiyun sub .l1 A5, A6, A4 51*4882a593Smuzhiyun nop 4 52*4882a593SmuzhiyunENDPROC(__c6xabi_remi) 53