1 files changed, 29 insertions, 0 deletions

diff --git a/arch/arm/include/asm/kprobes.h b/arch/arm/include/asm/kprobes.h
index 56f9ac68fbd1..50ff3bc7928e 100644
--- a/arch/arm/include/asm/kprobes.h
+++ b/arch/arm/include/asm/kprobes.h
@@ -50,5 +50,34 @@ int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr);
 int kprobe_exceptions_notify(struct notifier_block *self,
                              unsigned long val, void *data);
 
+/* optinsn template addresses */
+extern __visible kprobe_opcode_t optprobe_template_entry;
+extern __visible kprobe_opcode_t optprobe_template_val;
+extern __visible kprobe_opcode_t optprobe_template_call;
+extern __visible kprobe_opcode_t optprobe_template_end;
+extern __visible kprobe_opcode_t optprobe_template_sub_sp;
+extern __visible kprobe_opcode_t optprobe_template_add_sp;
+
+#define MAX_OPTIMIZED_LENGTH    4
+#define MAX_OPTINSN_SIZE                                \
+        ((unsigned long)&optprobe_template_end -        \
+         (unsigned long)&optprobe_template_entry)
+#define RELATIVEJUMP_SIZE       4
+
+struct arch_optimized_insn {
+        /*
+         * copy of the original instructions.
+         * Different from x86, ARM kprobe_opcode_t is u32.
+         */
+#define MAX_COPIED_INSN DIV_ROUND_UP(RELATIVEJUMP_SIZE, sizeof(kprobe_opcode_t))
+        kprobe_opcode_t copied_insn[MAX_COPIED_INSN];
+        /* detour code buffer */
+        kprobe_opcode_t *insn;
+        /*
+         * We always copy one instruction on ARM,
+         * so size will always be 4, and unlike x86, there is no
+         * need for a size field.
+         */
+};
 
 #endif /* _ARM_KPROBES_H */