ntoskrnl.exe: Return zero for unknown msr registers.

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@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

ntoskrnl.exe: Return zero for unknown msr registers.
6ceb6c7f · Paul Gofman · Alexandre Julliard · 6255b031 · 6ceb6c7f
Commit 6ceb6c7f authored May 25, 2020 by Paul Gofman Committed by Alexandre Julliard May 25, 2020
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instr.c dlls/ntoskrnl.exe/instr.c +5 -1

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--- 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;