linux-kernel - [PATCH 4/8] riscv: move exception table immediately after RO

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Message-Id: <20200217083223.2011-5-zong.li@sifive.com>
Date:   Mon, 17 Feb 2020 16:32:19 +0800
From:   Zong Li <zong.li@...ive.com>
To:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     Zong Li <zong.li@...ive.com>
Subject: [PATCH 4/8] riscv: move exception table immediately after RO_DATA

Move EXCEPTION_TABLE immediately after RO_DATA. Make it easy to set the
attribution of the sections which should be read-only at a time.
Move .sdata to indicate the start of data section with write permission.
This patch is prepared for STRICT_KERNEL_RWX support.

Signed-off-by: Zong Li <zong.li@...ive.com>
---
 arch/riscv/kernel/vmlinux.lds.S | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/kernel/vmlinux.lds.S b/arch/riscv/kernel/vmlinux.lds.S
index 1e0193ded420..4ba8a5397e8b 100644
--- a/arch/riscv/kernel/vmlinux.lds.S
+++ b/arch/riscv/kernel/vmlinux.lds.S
@@ -9,6 +9,7 @@
 #include <asm/page.h>
 #include <asm/cache.h>
 #include <asm/thread_info.h>
+#include <asm/set_memory.h>
 
 OUTPUT_ARCH(riscv)
 ENTRY(_start)
@@ -52,12 +53,15 @@ SECTIONS
 	}
 
 	/* Start of data section */
-	_sdata = .;
 	RO_DATA(L1_CACHE_BYTES)
 	.srodata : {
 		*(.srodata*)
 	}
 
+	EXCEPTION_TABLE(0x10)
+
+	_sdata = .;
+
 	RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
 	.sdata : {
 		__global_pointer$ = . + 0x800;
@@ -69,8 +73,6 @@ SECTIONS
 
 	BSS_SECTION(PAGE_SIZE, PAGE_SIZE, 0)
 
-	EXCEPTION_TABLE(0x10)
-
 	.rel.dyn : {
 		*(.rel.dyn*)
 	}
-- 
2.25.0