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 */
16 enum probe_insn __kprobes
riscv_probe_decode_insn(probe_opcode_t * addr,struct arch_probe_insn * api)17 riscv_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_j, insn);
33 RISCV_INSN_REJECTED(c_jr, insn);
34 RISCV_INSN_REJECTED(c_jal, insn);
35 RISCV_INSN_REJECTED(c_jalr, insn);
36 RISCV_INSN_REJECTED(c_beqz, insn);
37 RISCV_INSN_REJECTED(c_bnez, insn);
38 RISCV_INSN_REJECTED(c_ebreak, insn);
39 #endif
40
41 RISCV_INSN_SET_SIMULATE(jal, insn);
42 RISCV_INSN_SET_SIMULATE(jalr, insn);
43 RISCV_INSN_SET_SIMULATE(auipc, insn);
44 RISCV_INSN_SET_SIMULATE(branch, insn);
45
46 return INSN_GOOD;
47 }
48