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
|
//This file just contains a few methods required for some C++ things to work
#include <Core/types.wtf.h>
extern "C" void __cxa_pure_virtual() {} //Required when using abstract classes
void *__dso_handle; //Required when using global objects
extern "C" int __cxa_atexit(void (*f)(void*), void *p, void *d) { return 0; }
//Functions for quad divisions/modulo. Taken and arranged from klibc include/asm/div64.h
//These only work with 32-bit divisors and only return 32-bit remainder.
//TODO : think of some correct quad div/mod algorithms
extern "C" {
inline u64int doDiv(u64int dividend, u32int divisor, u32int *remainder) {
union {
u64int v64;
u32int v32[2];
} d = { dividend };
u32int upper;
upper = d.v32[1];
d.v32[1] = 0;
if (upper >= divisor) {
d.v32[1] = upper / divisor;
upper %= divisor;
}
asm ("divl %2" : "=a" (d.v32[0]), "=d" (*remainder) :
"rm" (divisor), "0" (d.v32[0]), "1" (upper));
return d.v64;
}
u64int __udivdi3(u64int dividend, u64int b) {
u32int divisor, remainder;
divisor = b;
return doDiv(dividend, divisor, &remainder);
}
u64int __umoddi3(u64int dividend, u64int b) {
u32int divisor, remainder;
divisor = b;
doDiv(dividend, divisor, &remainder);
return remainder;
}
}
|
