forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
93 lines
2.4 KiB
93 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* arch/arm/probes/kprobes/checkers-common.c |
|
* |
|
* Copyright (C) 2014 Huawei Inc. |
|
*/ |
|
|
|
#include <linux/kernel.h> |
|
#include "../decode.h" |
|
#include "../decode-arm.h" |
|
#include "checkers.h" |
|
|
|
enum probes_insn checker_stack_use_none(probes_opcode_t insn, |
|
struct arch_probes_insn *asi, |
|
const struct decode_header *h) |
|
{ |
|
asi->stack_space = 0; |
|
return INSN_GOOD_NO_SLOT; |
|
} |
|
|
|
enum probes_insn checker_stack_use_unknown(probes_opcode_t insn, |
|
struct arch_probes_insn *asi, |
|
const struct decode_header *h) |
|
{ |
|
asi->stack_space = -1; |
|
return INSN_GOOD_NO_SLOT; |
|
} |
|
|
|
#ifdef CONFIG_THUMB2_KERNEL |
|
enum probes_insn checker_stack_use_imm_0xx(probes_opcode_t insn, |
|
struct arch_probes_insn *asi, |
|
const struct decode_header *h) |
|
{ |
|
int imm = insn & 0xff; |
|
asi->stack_space = imm; |
|
return INSN_GOOD_NO_SLOT; |
|
} |
|
|
|
/* |
|
* Different from other insn uses imm8, the real addressing offset of |
|
* STRD in T32 encoding should be imm8 * 4. See ARMARM description. |
|
*/ |
|
enum probes_insn checker_stack_use_t32strd(probes_opcode_t insn, |
|
struct arch_probes_insn *asi, |
|
const struct decode_header *h) |
|
{ |
|
int imm = insn & 0xff; |
|
asi->stack_space = imm << 2; |
|
return INSN_GOOD_NO_SLOT; |
|
} |
|
#else |
|
enum probes_insn checker_stack_use_imm_x0x(probes_opcode_t insn, |
|
struct arch_probes_insn *asi, |
|
const struct decode_header *h) |
|
{ |
|
int imm = ((insn & 0xf00) >> 4) + (insn & 0xf); |
|
asi->stack_space = imm; |
|
return INSN_GOOD_NO_SLOT; |
|
} |
|
#endif |
|
|
|
enum probes_insn checker_stack_use_imm_xxx(probes_opcode_t insn, |
|
struct arch_probes_insn *asi, |
|
const struct decode_header *h) |
|
{ |
|
int imm = insn & 0xfff; |
|
asi->stack_space = imm; |
|
return INSN_GOOD_NO_SLOT; |
|
} |
|
|
|
enum probes_insn checker_stack_use_stmdx(probes_opcode_t insn, |
|
struct arch_probes_insn *asi, |
|
const struct decode_header *h) |
|
{ |
|
unsigned int reglist = insn & 0xffff; |
|
int pbit = insn & (1 << 24); |
|
asi->stack_space = (hweight32(reglist) - (!pbit ? 1 : 0)) * 4; |
|
|
|
return INSN_GOOD_NO_SLOT; |
|
} |
|
|
|
const union decode_action stack_check_actions[] = { |
|
[STACK_USE_NONE] = {.decoder = checker_stack_use_none}, |
|
[STACK_USE_UNKNOWN] = {.decoder = checker_stack_use_unknown}, |
|
#ifdef CONFIG_THUMB2_KERNEL |
|
[STACK_USE_FIXED_0XX] = {.decoder = checker_stack_use_imm_0xx}, |
|
[STACK_USE_T32STRD] = {.decoder = checker_stack_use_t32strd}, |
|
#else |
|
[STACK_USE_FIXED_X0X] = {.decoder = checker_stack_use_imm_x0x}, |
|
#endif |
|
[STACK_USE_FIXED_XXX] = {.decoder = checker_stack_use_imm_xxx}, |
|
[STACK_USE_STMDX] = {.decoder = checker_stack_use_stmdx}, |
|
};
|
|
|