94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* arch/arm/probes/kprobes/checkers-common.c
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*
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* Copyright (C) 2014 Huawei Inc.
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*/
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#include <linux/kernel.h>
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#include "../decode.h"
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#include "../decode-arm.h"
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#include "checkers.h"
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enum probes_insn checker_stack_use_none(probes_opcode_t insn,
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struct arch_probes_insn *asi,
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const struct decode_header *h)
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{
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asi->stack_space = 0;
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return INSN_GOOD_NO_SLOT;
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}
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enum probes_insn checker_stack_use_unknown(probes_opcode_t insn,
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struct arch_probes_insn *asi,
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const struct decode_header *h)
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{
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asi->stack_space = -1;
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return INSN_GOOD_NO_SLOT;
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}
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#ifdef CONFIG_THUMB2_KERNEL
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enum probes_insn checker_stack_use_imm_0xx(probes_opcode_t insn,
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struct arch_probes_insn *asi,
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const struct decode_header *h)
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{
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int imm = insn & 0xff;
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asi->stack_space = imm;
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return INSN_GOOD_NO_SLOT;
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}
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/*
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* Different from other insn uses imm8, the real addressing offset of
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* STRD in T32 encoding should be imm8 * 4. See ARMARM description.
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*/
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static enum probes_insn checker_stack_use_t32strd(probes_opcode_t insn,
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struct arch_probes_insn *asi,
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const struct decode_header *h)
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{
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int imm = insn & 0xff;
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asi->stack_space = imm << 2;
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return INSN_GOOD_NO_SLOT;
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}
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#else
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enum probes_insn checker_stack_use_imm_x0x(probes_opcode_t insn,
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struct arch_probes_insn *asi,
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const struct decode_header *h)
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{
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int imm = ((insn & 0xf00) >> 4) + (insn & 0xf);
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asi->stack_space = imm;
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return INSN_GOOD_NO_SLOT;
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}
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#endif
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enum probes_insn checker_stack_use_imm_xxx(probes_opcode_t insn,
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struct arch_probes_insn *asi,
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const struct decode_header *h)
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{
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int imm = insn & 0xfff;
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asi->stack_space = imm;
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return INSN_GOOD_NO_SLOT;
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}
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enum probes_insn checker_stack_use_stmdx(probes_opcode_t insn,
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struct arch_probes_insn *asi,
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const struct decode_header *h)
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{
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unsigned int reglist = insn & 0xffff;
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int pbit = insn & (1 << 24);
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asi->stack_space = (hweight32(reglist) - (!pbit ? 1 : 0)) * 4;
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return INSN_GOOD_NO_SLOT;
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}
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const union decode_action stack_check_actions[] = {
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[STACK_USE_NONE] = {.decoder = checker_stack_use_none},
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[STACK_USE_UNKNOWN] = {.decoder = checker_stack_use_unknown},
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#ifdef CONFIG_THUMB2_KERNEL
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[STACK_USE_FIXED_0XX] = {.decoder = checker_stack_use_imm_0xx},
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[STACK_USE_T32STRD] = {.decoder = checker_stack_use_t32strd},
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#else
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[STACK_USE_FIXED_X0X] = {.decoder = checker_stack_use_imm_x0x},
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#endif
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[STACK_USE_FIXED_XXX] = {.decoder = checker_stack_use_imm_xxx},
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[STACK_USE_STMDX] = {.decoder = checker_stack_use_stmdx},
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};
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