[reactos] 03/19: [ASM:X64] Save GS base MSR in trap frame

[Timo Kreuzer]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=7e6dce6aa147a980614b0…

commit 7e6dce6aa147a980614b0863b9654427996774c0
Author:     Timo Kreuzer <timo.kreuzer(a)reactos.org>
AuthorDate: Sun Apr 14 19:18:38 2019 +0200
Commit:     Timo Kreuzer <timo.kreuzer(a)reactos.org>
CommitDate: Sat Oct 31 14:23:16 2020 +0100

    [ASM:X64] Save GS base MSR in trap frame
---
 sdk/include/asm/trapamd64.inc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sdk/include/asm/trapamd64.inc b/sdk/include/asm/trapamd64.inc
index 74209493d90..f5ae982a380 100644
--- a/sdk/include/asm/trapamd64.inc
+++ b/sdk/include/asm/trapamd64.inc
@@ -97,6 +97,13 @@ MACRO(EnterTrap, Flags)
         mov [rbp + KTRAP_FRAME_SegGs], gs
     endif
 
+#if DBG
+    mov ecx, MSR_GS_BASE
+    rdmsr
+    mov [rbp + KTRAP_FRAME_GsBase], eax
+    mov [rbp + KTRAP_FRAME_GsBase + 4], edx
+#endif
+
     /* Save previous mode and check if it was user mode */
     mov ax, [rbp + KTRAP_FRAME_SegCs]
     and al, 1