2#include <linux/export.h>
3
4#include "libgcc.h"
5
6#define W_TYPE_SIZE 32
7
8#define __ll_B ((unsigned long) 1 << (W_TYPE_SIZE / 2))
9#define __ll_lowpart(t) ((unsigned long) (t) & (__ll_B - 1))
10#define __ll_highpart(t) ((unsigned long) (t) >> (W_TYPE_SIZE / 2))
11
12/* If we still don't have umul_ppmm, define it using plain C.  */
13#if !defined(umul_ppmm)
14#define umul_ppmm(w1, w0, u, v)                                         \
15        do {                                                            \
16                unsigned long __x0, __x1, __x2, __x3;                   \
17                unsigned short __ul, __vl, __uh, __vh;                  \
18                                                                        \
19                __ul = __ll_lowpart(u);                                 \
20                __uh = __ll_highpart(u);                                \
21                __vl = __ll_lowpart(v);                                 \
22                __vh = __ll_highpart(v);                                \
23                                                                        \
24                __x0 = (unsigned long) __ul * __vl;                     \
25                __x1 = (unsigned long) __ul * __vh;                     \
26                __x2 = (unsigned long) __uh * __vl;                     \
27                __x3 = (unsigned long) __uh * __vh;                     \
28                                                                        \
29                __x1 += __ll_highpart(__x0); /* this can't give carry */\
30                __x1 += __x2; /* but this indeed can */                 \
31                if (__x1 < __x2) /* did we get it? */                   \
32                __x3 += __ll_B; /* yes, add it in the proper pos */     \
33                                                                        \
34                (w1) = __x3 + __ll_highpart(__x1);                      \
35                (w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\
36        } while (0)
37#endif
38
39#if !defined(__umulsidi3)
40#define __umulsidi3(u, v) ({                            \
41        DWunion __w;                                    \
42        umul_ppmm(__w.s.high, __w.s.low, u, v);         \
43        __w.ll;                                         \
44        })
45#endif
46
47long long __muldi3(long long u, long long v)
48{
49        const DWunion uu = {.ll = u};
50        const DWunion vv = {.ll = v};
51        DWunion w = {.ll = __umulsidi3(uu.s.low, vv.s.low)};
52
53        w.s.high += ((unsigned long) uu.s.low * (unsigned long) vv.s.high
54                + (unsigned long) uu.s.high * (unsigned long) vv.s.low);
55
56        return w.ll;
57}
58EXPORT_SYMBOL(__muldi3);
59