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-rw-r--r--arch/csky/Kconfig1
-rw-r--r--arch/csky/include/asm/ptrace.h6
-rw-r--r--arch/csky/lib/Makefile1
-rw-r--r--arch/csky/lib/error-inject.c10
4 files changed, 18 insertions, 0 deletions
diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index 822362d0598e..c51f64c14391 100644
--- a/arch/csky/Kconfig
+++ b/arch/csky/Kconfig
@@ -45,6 +45,7 @@ config CSKY
select HAVE_DYNAMIC_FTRACE_WITH_REGS
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_GRAPH_TRACER
+ select HAVE_FUNCTION_ERROR_INJECTION
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_KERNEL_GZIP
select HAVE_KERNEL_LZO
diff --git a/arch/csky/include/asm/ptrace.h b/arch/csky/include/asm/ptrace.h
index bcfb7070e48d..82da5e08558d 100644
--- a/arch/csky/include/asm/ptrace.h
+++ b/arch/csky/include/asm/ptrace.h
@@ -52,6 +52,12 @@ static inline unsigned long regs_return_value(struct pt_regs *regs)
return regs->a0;
}
+static inline void regs_set_return_value(struct pt_regs *regs,
+ unsigned long val)
+{
+ regs->a0 = val;
+}
+
/* Valid only for Kernel mode traps. */
static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
{
diff --git a/arch/csky/lib/Makefile b/arch/csky/lib/Makefile
index 078e2d5f32e1..7fbdbb2c4d12 100644
--- a/arch/csky/lib/Makefile
+++ b/arch/csky/lib/Makefile
@@ -1,2 +1,3 @@
# SPDX-License-Identifier: GPL-2.0-only
lib-y := usercopy.o delay.o
+obj-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o
diff --git a/arch/csky/lib/error-inject.c b/arch/csky/lib/error-inject.c
new file mode 100644
index 000000000000..c15fb36fe067
--- /dev/null
+++ b/arch/csky/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->lr);
+}
+NOKPROBE_SYMBOL(override_function_with_return);