linux-kernel - [PATCH v2 2/3] MIPS: Move kernel head into a standalone section

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Date:   Wed, 27 May 2020 14:34:33 +0800
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     linux-mips@...r.kernel.org
Cc:     Jiaxun Yang <jiaxun.yang@...goat.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Kees Cook <keescook@...omium.org>,
        Borislav Petkov <bp@...e.de>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Fangrui Song <maskray@...gle.com>, linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/3] MIPS: Move kernel head into a standalone section

That's what already done by Arm64 and other architectures.
That would allow us put more things like PE headers safely into
the header.

Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
 arch/mips/kernel/head.S        | 4 ++--
 arch/mips/kernel/vmlinux.lds.S | 8 ++++++--
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/arch/mips/kernel/head.S b/arch/mips/kernel/head.S
index c7c2795837e7..8081a905a71c 100644
--- a/arch/mips/kernel/head.S
+++ b/arch/mips/kernel/head.S
@@ -59,6 +59,8 @@
 #endif
 	.endm
 
+	__HEAD
+_head:
 #ifndef CONFIG_NO_EXCEPT_FILL
 	/*
 	 * Reserved space for exception handlers.
@@ -67,8 +69,6 @@
 	.fill	0x400
 #endif
 
-EXPORT(_stext)
-
 	/*
 	 * Give us a fighting chance of running if execution beings at the
 	 * kernel load address.	 This is needed because this platform does
diff --git a/arch/mips/kernel/vmlinux.lds.S b/arch/mips/kernel/vmlinux.lds.S
index f185a85a27c1..b9ace667b82b 100644
--- a/arch/mips/kernel/vmlinux.lds.S
+++ b/arch/mips/kernel/vmlinux.lds.S
@@ -57,8 +57,12 @@ SECTIONS
 #endif
 	. = LINKER_LOAD_ADDRESS;
 	/* read-only */
-	_text = .;	/* Text and read-only data */
-	.text : {
+	.head.text : {
+		_text = .;
+		HEAD_TEXT
+	}
+	.text : {			/* Real text segment		*/
+		_stext = .;		/* Text and read-only data	*/
 		TEXT_TEXT
 		SCHED_TEXT
 		CPUIDLE_TEXT
-- 
2.27.0.rc0