From 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:44:59 +0000
Subject: [PATCH] gmac get mac form eeprom

---
 kernel/arch/x86/kernel/relocate_kernel_32.S |   32 +++++++++++++++++++++++---------
 1 files changed, 23 insertions(+), 9 deletions(-)

diff --git a/kernel/arch/x86/kernel/relocate_kernel_32.S b/kernel/arch/x86/kernel/relocate_kernel_32.S
index 77630d5..82a8398 100644
--- a/kernel/arch/x86/kernel/relocate_kernel_32.S
+++ b/kernel/arch/x86/kernel/relocate_kernel_32.S
@@ -1,18 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * relocate_kernel.S - put the kernel image in place to boot
  * Copyright (C) 2002-2004 Eric Biederman  <ebiederm@xmission.com>
- *
- * This source code is licensed under the GNU General Public License,
- * Version 2.  See the file COPYING for more details.
  */
 
 #include <linux/linkage.h>
 #include <asm/page_types.h>
 #include <asm/kexec.h>
+#include <asm/nospec-branch.h>
 #include <asm/processor-flags.h>
 
 /*
- * Must be relocatable PIC code callable as a C function
+ * Must be relocatable PIC code callable as a C function, in particular
+ * there must be a plain RET and not jump to return thunk.
  */
 
 #define PTR(x) (x << 2)
@@ -37,8 +37,7 @@
 #define CP_PA_BACKUP_PAGES_MAP	DATA(0x1c)
 
 	.text
-	.globl relocate_kernel
-relocate_kernel:
+SYM_CODE_START_NOALIGN(relocate_kernel)
 	/* Save the CPU context, used for jumping back */
 
 	pushl	%ebx
@@ -94,9 +93,12 @@
 	movl    %edi, %eax
 	addl    $(identity_mapped - relocate_kernel), %eax
 	pushl   %eax
+	ANNOTATE_UNRET_SAFE
 	ret
+	int3
+SYM_CODE_END(relocate_kernel)
 
-identity_mapped:
+SYM_CODE_START_LOCAL_NOALIGN(identity_mapped)
 	/* set return address to 0 if not preserving context */
 	pushl	$0
 	/* store the start address on the stack */
@@ -161,12 +163,15 @@
 	xorl    %edx, %edx
 	xorl    %esi, %esi
 	xorl    %ebp, %ebp
+	ANNOTATE_UNRET_SAFE
 	ret
+	int3
 1:
 	popl	%edx
 	movl	CP_PA_SWAP_PAGE(%edi), %esp
 	addl	$PAGE_SIZE, %esp
 2:
+	ANNOTATE_RETPOLINE_SAFE
 	call	*%edx
 
 	/* get the re-entry point of the peer system */
@@ -192,9 +197,12 @@
 	movl	%edi, %eax
 	addl	$(virtual_mapped - relocate_kernel), %eax
 	pushl	%eax
+	ANNOTATE_UNRET_SAFE
 	ret
+	int3
+SYM_CODE_END(identity_mapped)
 
-virtual_mapped:
+SYM_CODE_START_LOCAL_NOALIGN(virtual_mapped)
 	movl	CR4(%edi), %eax
 	movl	%eax, %cr4
 	movl	CR3(%edi), %eax
@@ -209,10 +217,13 @@
 	popl	%edi
 	popl	%esi
 	popl	%ebx
+	ANNOTATE_UNRET_SAFE
 	ret
+	int3
+SYM_CODE_END(virtual_mapped)
 
 	/* Do the copies */
-swap_pages:
+SYM_CODE_START_LOCAL_NOALIGN(swap_pages)
 	movl	8(%esp), %edx
 	movl	4(%esp), %ecx
 	pushl	%ebp
@@ -271,7 +282,10 @@
 	popl	%edi
 	popl	%ebx
 	popl	%ebp
+	ANNOTATE_UNRET_SAFE
 	ret
+	int3
+SYM_CODE_END(swap_pages)
 
 	.globl kexec_control_code_size
 .set kexec_control_code_size, . - relocate_kernel

--
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