[PATCH] ntoskrnl.exe: Return zero for unknown msr registers.

[Paul Gofman]

rdmsr should fault if called with the register not supported
by CPU. But until we want to support the full range of CPU
specific registers returning zero is probably a better
fallback.

Signed-off-by: Paul Gofman <pgofman(a)codeweavers.com>
---
 dlls/ntoskrnl.exe/instr.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/dlls/ntoskrnl.exe/instr.c b/dlls/ntoskrnl.exe/instr.c
index 68140c09ef..44f2ed4f51 100644
--- a/dlls/ntoskrnl.exe/instr.c
+++ b/dlls/ntoskrnl.exe/instr.c
@@ -815,7 +815,11 @@ static DWORD emulate_instruction( EXCEPTION_RECORD *rec, CONTEXT *context )
                 context->Rax = (ULONG)syscall_address;
                 break;
             }
-            default: return ExceptionContinueSearch;
+            default:
+                FIXME("reg %#x, returning 0.\n", reg);
+                context->Rdx = 0;
+                context->Rax = 0;
+                break;
             }
             context->Rip += prefixlen + 2;
             return ExceptionContinueExecution;
-- 
2.26.2