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