linux-kernel - [PATCH] riscv: put interrupt entries into .irqentry.text

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Date:   Mon, 21 Aug 2023 16:45:17 +0200
From:   Nam Cao <namcaov@...il.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Nam Cao <namcaov@...il.com>
Subject: [PATCH] riscv: put interrupt entries into .irqentry.text

The interrupt entries are expected to be in the .irqentry.text section.
For example, for kprobes to work properly, exception code cannot be
probed; this is ensured by blacklisting addresses in the .irqentry.text
section.

Signed-off-by: Nam Cao <namcaov@...il.com>
---
 arch/riscv/kernel/entry.S | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
index 143a2bb3e697..d7dd9030df3f 100644
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
@@ -14,6 +14,8 @@
 #include <asm/asm-offsets.h>
 #include <asm/errata_list.h>
 
+	.section .irqentry.text, "ax"
+
 SYM_CODE_START(handle_exception)
 	/*
 	 * If coming from userspace, preserve the user thread pointer and load
-- 
2.34.1