linux-kernel - [PATCH 1/3] arm64:insn: Export symbols for MSR ARM driver

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Date:   Tue,  1 Dec 2020 01:48:31 +0800
From:   Rongwei Wang <rongwei.wang@...ux.alibaba.com>
To:     catalin.marinas@....com, will@...nel.org,
        bjorn.andersson@...aro.org, shawnguo@...nel.org
Cc:     vkoul@...nel.org, geert+renesas@...der.be, Anson.Huang@....com,
        michael@...le.cc, krzk@...nel.org, olof@...om.net,
        vincenzo.frascino@....com, ardb@...nel.org, masahiroy@...nel.org,
        gshan@...hat.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] arm64:insn: Export symbols for MSR ARM driver

In order to use the MSR-ARM driver in module and built-in ways, we need export
following symbols.

The MSR-ARM driver depends on function aarch64_insn_patch_text to modify the
text at runtime, and function aarch64_insn_read to read one instruction in the
specified address.

In addition, we need register_undef_hook and unregister_undef_hook to handle
the low probability undefined exception which triggered only by MSR-ARM driver.

Signed-off-by: Rongwei Wang <rongwei.wang@...ux.alibaba.com>
---
 arch/arm64/kernel/insn.c  | 2 ++
 arch/arm64/kernel/traps.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/arch/arm64/kernel/insn.c b/arch/arm64/kernel/insn.c
index 6c0de2f..67a1f78 100644
--- a/arch/arm64/kernel/insn.c
+++ b/arch/arm64/kernel/insn.c
@@ -135,6 +135,7 @@ int __kprobes aarch64_insn_read(void *addr, u32 *insnp)
 
 	return ret;
 }
+EXPORT_SYMBOL(aarch64_insn_read);
 
 static int __kprobes __aarch64_insn_write(void *addr, __le32 insn)
 {
@@ -247,6 +248,7 @@ int __kprobes aarch64_insn_patch_text(void *addrs[], u32 insns[], int cnt)
 	return stop_machine_cpuslocked(aarch64_insn_patch_text_cb, &patch,
 				       cpu_online_mask);
 }
+EXPORT_SYMBOL(aarch64_insn_patch_text);
 
 static int __kprobes aarch64_get_imm_shift_mask(enum aarch64_insn_imm_type type,
 						u32 *maskp, int *shiftp)
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 8af4e0e..c76efa5 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -292,6 +292,7 @@ void register_undef_hook(struct undef_hook *hook)
 	list_add(&hook->node, &undef_hook);
 	raw_spin_unlock_irqrestore(&undef_lock, flags);
 }
+EXPORT_SYMBOL(register_undef_hook);
 
 void unregister_undef_hook(struct undef_hook *hook)
 {
@@ -301,6 +302,7 @@ void unregister_undef_hook(struct undef_hook *hook)
 	list_del(&hook->node);
 	raw_spin_unlock_irqrestore(&undef_lock, flags);
 }
+EXPORT_SYMBOL(unregister_undef_hook);
 
 static int call_undef_hook(struct pt_regs *regs)
 {
-- 
1.8.3.1