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arch/c6x/lib/remi.S
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;; SPDX-License-Identifier: GPL-2.0-or-later |
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;; Copyright 2010 Free Software Foundation, Inc. ;; Contributed by Bernd Schmidt <bernds@codesourcery.com>. ;; |
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#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) |