From 9cf5fe590b95dc8cec32f0102d4c25d2d918918a Mon Sep 17 00:00:00 2001
From: Pawel Wieczorkiewicz <wipawel@grsecurity.net>
Date: Fri, 8 Jul 2022 13:57:36 +0200
Subject: [PATCH] arch: add SET_CR3 assembly macro

The macro preserves RAX register via stack, but does not clean the stack.

Signed-off-by: Pawel Wieczorkiewicz <wipawel@grsecurity.net>
---
 include/arch/x86/asm-macros.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/arch/x86/asm-macros.h b/include/arch/x86/asm-macros.h
index 6b946d57..acdb7edd 100644
--- a/include/arch/x86/asm-macros.h
+++ b/include/arch/x86/asm-macros.h
@@ -152,6 +152,13 @@
 #endif
 .endm
 
+.macro SET_CR3 val
+    push %_ASM_AX
+    mov (\val), %_ASM_AX
+    mov %_ASM_AX, %cr3
+    pop %_ASM_AX
+.endm
+
 #define GLOBAL(name) \
     .global name;    \
 name: