1// SPDX-License-Identifier: GPL-2.0+
2
3#include <linux/kernel.h>
4#include <linux/kprobes.h>
5#include <linux/module.h>
6#include <linux/kallsyms.h>
7#include <asm/sections.h>
8
9#include "decode-insn.h"
10#include "simulate-insn.h"
11
12/* Return:
13 *   INSN_REJECTED     If instruction is one not allowed to kprobe,
14 *   INSN_GOOD_NO_SLOT If instruction is supported but doesn't use its slot.
15 */
16enum probe_insn __kprobes
17riscv_probe_decode_insn(probe_opcode_t *addr, struct arch_probe_insn *api)
18{
19	probe_opcode_t insn = *addr;
20
21	/*
22	 * Reject instructions list:
23	 */
24	RISCV_INSN_REJECTED(system,		insn);
25	RISCV_INSN_REJECTED(fence,		insn);
26
27	/*
28	 * Simulate instructions list:
29	 * TODO: the REJECTED ones below need to be implemented
30	 */
31#ifdef CONFIG_RISCV_ISA_C
32	RISCV_INSN_REJECTED(c_jal,		insn);
33	RISCV_INSN_REJECTED(c_ebreak,		insn);
34
35	RISCV_INSN_SET_SIMULATE(c_j,		insn);
36	RISCV_INSN_SET_SIMULATE(c_jr,		insn);
37	RISCV_INSN_SET_SIMULATE(c_jalr,		insn);
38	RISCV_INSN_SET_SIMULATE(c_beqz,		insn);
39	RISCV_INSN_SET_SIMULATE(c_bnez,		insn);
40#endif
41
42	RISCV_INSN_SET_SIMULATE(jal,		insn);
43	RISCV_INSN_SET_SIMULATE(jalr,		insn);
44	RISCV_INSN_SET_SIMULATE(auipc,		insn);
45	RISCV_INSN_SET_SIMULATE(branch,		insn);
46
47	return INSN_GOOD;
48}
49