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Fix fatal SEHException on Arm calling RDTSC #1055

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merged 1 commit into from
Apr 28, 2023
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Fix fatal SEHException on Arm calling RDTSC #1055

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10 changes: 9 additions & 1 deletion src/NetMQ/Core/Utils/OpCode.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -12,13 +12,21 @@ internal static class Opcode

public static bool Open()
{
#if NETSTANDARD1_1_OR_GREATER || NET471_OR_GREATER
if (RuntimeInformation.ProcessArchitecture != Architecture.X86 &&
RuntimeInformation.ProcessArchitecture != Architecture.X64)
{
return false; // RDTSC instruction not supported
}
#endif

var p = (int)Environment.OSVersion.Platform;

byte[] rdtscCode = IntPtr.Size == 4 ? RDTSC_32 : RDTSC_64;

s_size = (ulong)(rdtscCode.Length);

if ((p == 4) || (p == 128))
if ((p == 4) || (p == 128)) // Unix || Mono on Unix
{
// Unix
if (IsARMArchitecture()) return false;
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