From 6de0aa7381c86ece908859c82515878cb0d677fd Mon Sep 17 00:00:00 2001
From: Pawel Wieczorkiewicz <wipawel@grsecurity.net>
Date: Fri, 8 Oct 2021 13:51:22 +0200
Subject: [PATCH] setup: use tail-call for kernel_main jump

Signed-off-by: Pawel Wieczorkiewicz <wipawel@grsecurity.net>
Suggested-By: Mathias Krause <minipli@grsecurity.net>
---
 common/setup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/setup.c b/common/setup.c
index 94b9fd62..7eaa7b63 100644
--- a/common/setup.c
+++ b/common/setup.c
@@ -300,7 +300,7 @@ void __noreturn __text_init kernel_start(uint32_t multiboot_magic,
         init_keyboard(get_bsp_cpu_id());
 
     /* Jump from .text.init section to .text */
-    asm volatile("push %0; ret" ::"r"(&kernel_main));
+    asm volatile("jmp kernel_main");
 
     UNREACHABLE();
 }