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-rw-r--r--include/asm-generic/error-injection.h42
1 files changed, 42 insertions, 0 deletions
diff --git a/include/asm-generic/error-injection.h b/include/asm-generic/error-injection.h
new file mode 100644
index 000000000..7ddd9dc10
--- /dev/null
+++ b/include/asm-generic/error-injection.h
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_GENERIC_ERROR_INJECTION_H
+#define _ASM_GENERIC_ERROR_INJECTION_H
+
+#if defined(__KERNEL__) && !defined(__ASSEMBLY__)
+enum {
+ EI_ETYPE_NONE, /* Dummy value for undefined case */
+ EI_ETYPE_NULL, /* Return NULL if failure */
+ EI_ETYPE_ERRNO, /* Return -ERRNO if failure */
+ EI_ETYPE_ERRNO_NULL, /* Return -ERRNO or NULL if failure */
+ EI_ETYPE_TRUE, /* Return true if failure */
+};
+
+struct error_injection_entry {
+ unsigned long addr;
+ int etype;
+};
+
+struct pt_regs;
+
+#ifdef CONFIG_FUNCTION_ERROR_INJECTION
+/*
+ * Whitelist ganerating macro. Specify functions which can be
+ * error-injectable using this macro.
+ */
+#define ALLOW_ERROR_INJECTION(fname, _etype) \
+static struct error_injection_entry __used \
+ __section("_error_injection_whitelist") \
+ _eil_addr_##fname = { \
+ .addr = (unsigned long)fname, \
+ .etype = EI_ETYPE_##_etype, \
+ };
+
+void override_function_with_return(struct pt_regs *regs);
+#else
+#define ALLOW_ERROR_INJECTION(fname, _etype)
+
+static inline void override_function_with_return(struct pt_regs *regs) { }
+#endif
+#endif
+
+#endif /* _ASM_GENERIC_ERROR_INJECTION_H */