win: Save contents of TEBs allowing !teb and !gle to work in windbg

util/win/process_structs.h

Index: util/win/process_structs.h
diff --git a/util/win/process_structs.h b/util/win/process_structs.h
index 79f6515259c4bb13c29564749bd329e2f3bfcf6e..f9a3a9d03ca3a8c2a329ff2aa6b631f9b7606404 100644
--- a/util/win/process_structs.h
+++ b/util/win/process_structs.h
@@ -309,12 +309,18 @@ struct CLIENT_ID {
 };
 
 // This is a partial definition of the TEB, as we do not currently use many
-// fields of it. See http://www.nirsoft.net/kernel_struct/vista/TEB.html.
+// fields of it. See http://www.nirsoft.net/kernel_struct/vista/TEB.html, and
+// the (arch-specific) definition of _TEB in winternal.h.
 template <class Traits>
 struct TEB {
   NT_TIB<Traits> NtTib;
   typename Traits::Pointer EnvironmentPointer;
   CLIENT_ID<Traits> ClientId;
+  typename Traits::Pointer Reserved0[397];

[Mark Mentovai, 2015/09/29 22:14:04]

Can you name the reserved fields to match <winternal.h>? Start at Reserved2
(although its base offset is different, so maybe name it something like
SortaReserved2 with a comment), since you’ve got real fields where Reserved1
was.

[scottmg, 2015/09/30 18:54:11]

Done.

+  BYTE Reserved1[1952];
+  typename Traits::Pointer TlsSlots[64];
+  BYTE Reserved2[8];
+  typename Traits::Pointer Reserved3[32];

[Mark Mentovai, 2015/09/29 22:14:04]

No reason you can’t have this be Reserved5/ForOle/6/TlsExpansionSlots matching
<winternl.h> too.

Even if we’re not looking inside this structure, having things be matchy-matchy
helps reason that it is in fact equivalent to the OS’ idea of the same.

[scottmg, 2015/09/30 18:54:11]

Done.

 };
 
 // See https://msdn.microsoft.com/en-us/library/gg750724.aspx.