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
|
#include <stdint.h>
#include <stdlib.h>
void* operator new(size_t s)
{
return malloc(s);
};
void* operator new[](size_t s)
{
return malloc(s);
};
void* operator new(size_t s, void *place)
{
return place;
}
void* operator new[](size_t s, void *place)
{
return place;
}
void operator delete(void* p)
{
return free(p);
};
void operator delete[](void* p)
{
return free(p);
};
extern "C" int __cxa_guard_acquire(volatile uint64_t* gv)
{
// 0 -> uninitialized
// 1 -> locked
// 2 -> unlocked and initialized
uint32_t v = __sync_val_compare_and_swap((volatile uint32_t*)gv, 0, 1);
if (v == 0)
return 1;
if (v == 2)
return 0;
while(2 != *(volatile uint32_t*)gv);
return 0;
/*
register volatile void* guard = gv;
register uint32_t c = 0;
asm volatile(
"__cxa_guard_acquire_begin:"
"lwarx %0,0,%1;" // Load guard with reserve
"cmpi 0,%0,0;" // Compare with 0
"bne+ __cxa_guard_acquire_finish;" // != 0, goto "finished"
"li %0, 1;" // Set to 1.
"stwcx. %0,0,%1;" // Store against reserve
"bne- __cxa_guard_acquire_begin;" // goto begin if failed store.
"li %0, 3;" // Set to 3 -> success in lock
"__cxa_guard_acquire_finish:"
: "+r" (c) : "r" (guard): "memory","cc"
);
while (2 > c)
{
asm volatile("lwz %0, 0(%1);" : "=r" (c) : "r" (guard));
}
return (3 == c ? 1 : 0); // 3 means success in lock, return 1 (obtained)
// 2 means initialized, return 0
*/
}
extern "C" void __cxa_guard_release(volatile uint64_t* gv)
{
(*(volatile uint32_t*)gv) = 2;
/*
register volatile void* guard = gv;
register uint32_t c = 2;
asm volatile("stw %0, 0(%1)" :: "r"(c) , "r" (guard): "memory");
*/
return;
}
extern "C" int __cxa_atexit(void (*)(void*), void*, void*)
{
return 0;
}
extern "C" void __cxa_pure_virtual()
{
// TODO: Add better code for invalid pure virtual call.
while(1);
}
void* __dso_handle = (void*) &__dso_handle;
|
