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From: Jiaxun Yang <jiaxun.yang@flygoat.com>
To: linux-mips@vger.kernel.org
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Kees Cook <keescook@chromium.org>, Borislav Petkov <bp@suse.de>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	Fangrui Song <maskray@google.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH v2 2/3] MIPS: Move kernel head into a standalone section
Date: Wed, 27 May 2020 14:34:33 +0800	[thread overview]
Message-ID: <20200527063438.391949-3-jiaxun.yang@flygoat.com> (raw)
In-Reply-To: <20200527063438.391949-1-jiaxun.yang@flygoat.com>

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@flygoat.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


  parent reply	other threads:[~2020-05-27  6:35 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-27  6:34 [PATCH v2 0/3] Buggy bootloader workaround v2 Jiaxun Yang
2020-05-27  6:34 ` [PATCH v2 1/3] MIPS: head.S: Always jump to kernel_entry at head of text Jiaxun Yang
2020-05-27 11:41   ` Thomas Bogendoerfer
2020-05-27  6:34 ` Jiaxun Yang [this message]
2020-05-27 11:53   ` [PATCH v2 2/3] MIPS: Move kernel head into a standalone section Thomas Bogendoerfer
2020-05-27 12:05     ` Jiaxun Yang
2020-05-27 13:33       ` Thomas Bogendoerfer
2020-05-27  6:34 ` [PATCH v2 3/3] MIPS: Loongson64: select NO_EXCEPT_FILL Jiaxun Yang
2020-05-27 11:47   ` Thomas Bogendoerfer

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