================
@@ -1895,11 +1907,27 @@ inline bool Registers_arm64::validRegister(int regNum)
const {
return false;
if (regNum == UNW_AARCH64_RA_SIGN_STATE)
return true;
+ if (regNum == UNW_AARCH64_VG)
+ return true;
if ((regNum > 32) && (regNum < 64))
return false;
return true;
}
+inline uint64_t Registers_arm64::lazyGetVG() const {
+ if (!_misc_registers.__vg) {
+#if defined(__aarch64__)
+ register uint64_t vg asm("x0");
+ asm(".inst 0x04e0e3e0" // CNTD x0
+ : "=r"(vg));
+ _misc_registers.__vg = vg;
----------------
MacDue wrote:
Not sure if there's a nicer way to do this, LLVM's compiler-rt provides
`__arm_get_current_vg` (which would be a safer alternative), but depending on
how libunwind is built, it's not necessarily going to be available.
https://github.com/llvm/llvm-project/pull/153565
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