| 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 |
| 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_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 |