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older darwin have no CLOCK_MONOTONIC

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use asm rdtsc then
This commit is contained in:
Reini Urban 2019-06-23 12:46:33 +02:00
parent 06f8da4218
commit 50cef64bf8
1 changed files with 21 additions and 0 deletions
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21
src/init.c
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@ -140,6 +140,24 @@ uintptr_t _mi_random_shuffle(uintptr_t x) {
return x; return x;
} }
#if defined __APPLE__
static int64_t rdtsc()
{
#ifdef __x86_64__
unsigned int a, d;
__asm__ volatile ("rdtsc" : "=a" (a), "=d" (d));
return (unsigned long)a | ((unsigned long)d << 32);
#elif defined(__i386__)
unsigned long long int x;
__asm__ volatile ("rdtsc" : "=A" (x));
return x;
#else
#define NO_CYCLE_COUNTER
return 0;
#endif
}
#endif
uintptr_t _mi_random_init(uintptr_t seed /* can be zero */) { uintptr_t _mi_random_init(uintptr_t seed /* can be zero */) {
// Hopefully, ASLR makes our function address random // Hopefully, ASLR makes our function address random
uintptr_t x = (uintptr_t)((void*)&_mi_random_init); uintptr_t x = (uintptr_t)((void*)&_mi_random_init);
@ -149,6 +167,9 @@ uintptr_t _mi_random_init(uintptr_t seed /* can be zero */) {
LARGE_INTEGER pcount; LARGE_INTEGER pcount;
QueryPerformanceCounter(&pcount); QueryPerformanceCounter(&pcount);
x ^= (uintptr_t)(pcount.QuadPart); x ^= (uintptr_t)(pcount.QuadPart);
#elif defined __APPLE__
int64_t time = rdtsc();
x ^= time;
#else #else
struct timespec time; struct timespec time;
clock_gettime(CLOCK_MONOTONIC, &time); clock_gettime(CLOCK_MONOTONIC, &time);