1/* libgcc functions for Blackfin. 2 Copyright (C) 2005 Free Software Foundation, Inc. 3 Contributed by Analog Devices. 4 5This file is part of GCC. 6 7GCC is free software; you can redistribute it and/or modify 8it under the terms of the GNU General Public License as published by 9the Free Software Foundation; either version 2, or (at your option) 10any later version. 11 12GCC is distributed in the hope that it will be useful, 13but WITHOUT ANY WARRANTY; without even the implied warranty of 14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15GNU General Public License for more details. 16 17You should have received a copy of the GNU General Public License 18along with GCC; see the file COPYING. If not, write to 19the Free Software Foundation, 51 Franklin Street, Fifth Floor, 20Boston, MA 02110-1301, USA. */ 21 22/* As a special exception, if you link this library with files 23 compiled with GCC to produce an executable, this does not cause 24 the resulting executable to be covered by the GNU General Public License. 25 This exception does not however invalidate any other reasons why 26 the executable file might be covered by the GNU General Public License. */ 27 28 29#ifdef L_divsi3 30.text 31.align 2 32.global ___divsi3; 33.type ___divsi3, STT_FUNC; 34 35___divsi3: 36 [--SP]= RETS; 37 [--SP] = R7; 38 39 R2 = -R0; 40 CC = R0 < 0; 41 IF CC R0 = R2; 42 R7 = CC; 43 44 R2 = -R1; 45 CC = R1 < 0; 46 IF CC R1 = R2; 47 R2 = CC; 48 R7 = R7 ^ R2; 49 50 CALL ___udivsi3; 51 52 CC = R7; 53 R1 = -R0; 54 IF CC R0 = R1; 55 56 R7 = [SP++]; 57 RETS = [SP++]; 58 RTS; 59#endif 60 61#ifdef L_modsi3 62.align 2 63.global ___modsi3; 64.type ___modsi3, STT_FUNC; 65 66___modsi3: 67 [--SP] = RETS; 68 /* P1 and P2 are preserved by divsi3 and udivsi3. */ 69 P1 = R0; 70 P2 = R1; 71 CALL ___divsi3; 72 R1 = P1; 73 R2 = P2; 74 R2 *= R0; 75 R0 = R1 - R2; 76 RETS = [SP++]; 77 RTS; 78#endif 79 80#ifdef L_udivsi3 81.align 2 82.global ___udivsi3; 83.type ___udivsi3, STT_FUNC; 84 85___udivsi3: 86 P0 = 32; 87 LSETUP (0f, 1f) LC0 = P0; 88 /* upper half of dividend */ 89 R3 = 0; 900: 91 /* The first time round in the loop we shift in garbage, but since we 92 perform 33 shifts, it doesn't matter. */ 93 R0 = ROT R0 BY 1; 94 R3 = ROT R3 BY 1; 95 R2 = R3 - R1; 96 CC = R3 < R1 (IU); 971: 98 /* Last instruction of the loop. */ 99 IF ! CC R3 = R2; 100 101 /* Shift in the last bit. */ 102 R0 = ROT R0 BY 1; 103 /* R0 is the result, R3 contains the remainder. */ 104 R0 = ~ R0; 105 RTS; 106#endif 107 108#ifdef L_umodsi3 109.align 2 110.global ___umodsi3; 111.type ___umodsi3, STT_FUNC; 112 113___umodsi3: 114 [--SP] = RETS; 115 CALL ___udivsi3; 116 R0 = R3; 117 RETS = [SP++]; 118 RTS; 119#endif 120 121