summaryrefslogtreecommitdiff
path: root/libc/bcc/bcc_i386.c
blob: d994628ee9a8937f6018305e01d592943632c484 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
/************************************************************************/
/* This file contains the BCC compiler helper functions */
/* Support for 386 integer arithmetic 
 * __divsi3.o __idiv.o __idivu.o __imod.o __imodu.o __imul.o
 * __isl.o __isr.o __isru.o
 */

#ifdef __AS386_32__
#asm
	.text	! This is common to all.
	.align	4
#endasm

#ifdef L___divsi3
#asm
! divsi3.s
	.globl ___divsi3
 ___divsi3:
	push	edx
	mov	eax,[esp+4+4]
	cdq
	idiv	[esp+4+4+4]
	pop	edx
	ret

	.globl ___udivsi3
	.text
	.align	4

 ___udivsi3:
	push	edx
	mov	eax,[esp+4+4]
	sub	edx,edx
	div	[esp+4+4+4]
	pop	edx
	ret
#endasm
#endif

#ifdef L___idiv
#asm
! idiv.s
! idiv_ doesn`t preserve edx (returns remainder in it)

	.globl idiv_
idiv_:
	cdq
	idiv	ebx
	ret
#endasm
#endif

#ifdef L___idivu
#asm
! idivu.s
! idiv_u doesn`t preserve edx (returns remainder in it)

	.globl idiv_u
idiv_u:
	xor	edx,edx
	div	ebx
	ret
#endasm
#endif

#ifdef L___imod
#asm
! imod.s
! imod doesn`t preserve edx (returns quotient in it)

	.globl imod
imod:
	cdq
	idiv	ebx
	mov	eax,edx		! instruction queue full so xchg slower
	ret
#endasm
#endif

#ifdef L___imodu
#asm
! imodu.s
! imodu doesn`t preserve edx (returns quotient in it)

	.globl imodu
imodu:
	xor	edx,edx
	div	ebx
	mov	eax,edx		! instruction queue full so xchg slower
	ret
#endasm
#endif

#ifdef L___imul
#asm
! imul.s
! imul_, imul_u don`t preserve edx

	.globl imul_
	.globl imul_u
imul_:
imul_u:
	imul	ebx
	ret
#endasm
#endif

#ifdef L___isl
#asm
! isl.s
! isl, islu don`t preserve cl

	.globl isl
	.globl islu
isl:
islu:
	mov	cl,bl
	shl	eax,cl
	ret
#endasm
#endif

#ifdef L___isr
#asm
! isr.s
! isr doesn`t preserve cl

	.globl isr
isr:
	mov	cl,bl
	sar	eax,cl
	ret
#endasm
#endif

#ifdef L___isru
#asm
! isru.s
! isru doesn`t preserve cl

	.globl isru
isru:
	mov	cl,bl
	shr	eax,cl
	ret
#endasm
#endif

#endif