#include <string.h>
#include <sys/auxv.h>
#include <sys/system_properties.h>
static bool __isExynos9810(void) {
char arch[PROP_VALUE_MAX];
return __system_property_get("ro.arch", arch) > 0 &&
strncmp(arch, "exynos9810", sizeof("exynos9810") - 1) == 0;
}
static void CONSTRUCTOR_ATTRIBUTE init_have_lse_atomics(void) {
unsigned long hwcap = getauxval(AT_HWCAP);
_Bool result = (hwcap & HWCAP_ATOMICS) != 0;
if (result) {
// Some cores in the Exynos 9810 CPU are ARMv8.2 and others are ARMv8.0;
// only the former support LSE atomics. However, the kernel in the
// initial Android 8.0 release of Galaxy S9/S9+ devices incorrectly
// reported the feature as being supported.
//
// The kernel appears to have been corrected to mark it unsupported as of
// the Android 9.0 release on those devices, and this issue has not been
// observed anywhere else. Thus, this workaround may be removed if
// compiler-rt ever drops support for Android 8.0.
if (__isExynos9810())
result = false;
}
__aarch64_have_lse_atomics = result;
}