From aaa4dd1b47f5ff5ef477fec5dcc6c397b457f1c2 Mon Sep 17 00:00:00 2001
From: Wang Kefeng <wangkefeng.wang@huawei.com>
Date: Sun, 4 Dec 2022 04:46:40 +0100
Subject: ARM: 9279/1: support function error injection

This enables HAVE_FUNCTION_ERROR_INJECTION by adding necessary
regs_set_return_value() and override_function_with_return().

Simply tested according to Documentation/fault-injection/fault-injection.rst.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 arch/arm/lib/error-inject.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 arch/arm/lib/error-inject.c

(limited to 'arch/arm/lib/error-inject.c')

diff --git a/arch/arm/lib/error-inject.c b/arch/arm/lib/error-inject.c
new file mode 100644
index 000000000000..5a5b405792ba
--- /dev/null
+++ b/arch/arm/lib/error-inject.c
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/error-injection.h>
+#include <linux/kprobes.h>
+
+void override_function_with_return(struct pt_regs *regs)
+{
+	instruction_pointer_set(regs, regs->ARM_lr);
+}
+NOKPROBE_SYMBOL(override_function_with_return);
-- 
cgit v1.2.3