LXR linux/arch/riscv/kernel/probes/decode-insn.c

   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_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