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_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