linux-kernel - [PATCH v5 7/9] riscv: move exception table immediately after RO

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Date:   Wed,  8 Apr 2020 15:57:02 +0800
From:   Zong Li <zong.li@...ive.com>
To:     palmer@...belt.com, paul.walmsley@...ive.com,
        aou@...s.berkeley.edu, mhiramat@...nel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Zong Li <zong.li@...ive.com>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>
Subject: [PATCH v5 7/9] 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.
Add _data to specify 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>
Suggested-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
---
 arch/riscv/kernel/vmlinux.lds.S | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/kernel/vmlinux.lds.S b/arch/riscv/kernel/vmlinux.lds.S
index 1e0193ded420..02e948b620af 100644
--- a/arch/riscv/kernel/vmlinux.lds.S
+++ b/arch/riscv/kernel/vmlinux.lds.S
@@ -58,6 +58,10 @@ SECTIONS
 		*(.srodata*)
 	}
 
+	EXCEPTION_TABLE(0x10)
+
+	_data = .;
+
 	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*)
 	}
-- 
2.26.0