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mirror_ubuntu-kernels/arch/arm64/lib/insn.c

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lowlatency-hwe-6.8-next
2024-07-02 00:48:40 +03:00
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2013 Huawei Ltd.
* Author: Jiang Liu <liuj97@gmail.com>
*
* Copyright (C) 2014-2016 Zi Shen Lim <zlim.lnx@gmail.com>
*/
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/printk.h>
#include <linux/sizes.h>
#include <linux/types.h>
#include <asm/debug-monitors.h>
#include <asm/errno.h>
#include <asm/insn.h>
#include <asm/kprobes.h>
#define AARCH64_INSN_SF_BIT BIT(31)
#define AARCH64_INSN_N_BIT BIT(22)
#define AARCH64_INSN_LSL_12 BIT(22)
static int __kprobes aarch64_get_imm_shift_mask(enum aarch64_insn_imm_type type,
u32 *maskp, int *shiftp)
{
u32 mask;
int shift;
switch (type) {
case AARCH64_INSN_IMM_26:
mask = BIT(26) - 1;
shift = 0;
break;
case AARCH64_INSN_IMM_19:
mask = BIT(19) - 1;
shift = 5;
break;
case AARCH64_INSN_IMM_16:
mask = BIT(16) - 1;
shift = 5;
break;
case AARCH64_INSN_IMM_14:
mask = BIT(14) - 1;
shift = 5;
break;
case AARCH64_INSN_IMM_12:
mask = BIT(12) - 1;
shift = 10;
break;
case AARCH64_INSN_IMM_9:
mask = BIT(9) - 1;
shift = 12;
break;
case AARCH64_INSN_IMM_7:
mask = BIT(7) - 1;
shift = 15;
break;
case AARCH64_INSN_IMM_6:
case AARCH64_INSN_IMM_S:
mask = BIT(6) - 1;
shift = 10;
break;
case AARCH64_INSN_IMM_R:
mask = BIT(6) - 1;
shift = 16;
break;
case AARCH64_INSN_IMM_N:
mask = 1;
shift = 22;
break;
default:
return -EINVAL;
}
*maskp = mask;
*shiftp = shift;
return 0;
}
#define ADR_IMM_HILOSPLIT 2
#define ADR_IMM_SIZE SZ_2M
#define ADR_IMM_LOMASK ((1 << ADR_IMM_HILOSPLIT) - 1)
#define ADR_IMM_HIMASK ((ADR_IMM_SIZE >> ADR_IMM_HILOSPLIT) - 1)
#define ADR_IMM_LOSHIFT 29
#define ADR_IMM_HISHIFT 5
u64 aarch64_insn_decode_immediate(enum aarch64_insn_imm_type type, u32 insn)
{
u32 immlo, immhi, mask;
int shift;
switch (type) {
case AARCH64_INSN_IMM_ADR:
shift = 0;
immlo = (insn >> ADR_IMM_LOSHIFT) & ADR_IMM_LOMASK;
immhi = (insn >> ADR_IMM_HISHIFT) & ADR_IMM_HIMASK;
insn = (immhi << ADR_IMM_HILOSPLIT) | immlo;
mask = ADR_IMM_SIZE - 1;
break;
default:
if (aarch64_get_imm_shift_mask(type, &mask, &shift) < 0) {
pr_err("%s: unknown immediate encoding %d\n", __func__,
type);
return 0;
}
}
return (insn >> shift) & mask;
}
u32 __kprobes aarch64_insn_encode_immediate(enum aarch64_insn_imm_type type,
u32 insn, u64 imm)
{
u32 immlo, immhi, mask;
int shift;
if (insn == AARCH64_BREAK_FAULT)
return AARCH64_BREAK_FAULT;
switch (type) {
case AARCH64_INSN_IMM_ADR:
shift = 0;
immlo = (imm & ADR_IMM_LOMASK) << ADR_IMM_LOSHIFT;
imm >>= ADR_IMM_HILOSPLIT;
immhi = (imm & ADR_IMM_HIMASK) << ADR_IMM_HISHIFT;
imm = immlo | immhi;
mask = ((ADR_IMM_LOMASK << ADR_IMM_LOSHIFT) |
(ADR_IMM_HIMASK << ADR_IMM_HISHIFT));
break;
default:
if (aarch64_get_imm_shift_mask(type, &mask, &shift) < 0) {
pr_err("%s: unknown immediate encoding %d\n", __func__,
type);
return AARCH64_BREAK_FAULT;
}
}
/* Update the immediate field. */
insn &= ~(mask << shift);
insn |= (imm & mask) << shift;
return insn;
}
u32 aarch64_insn_decode_register(enum aarch64_insn_register_type type,
u32 insn)
{
int shift;
switch (type) {
case AARCH64_INSN_REGTYPE_RT:
case AARCH64_INSN_REGTYPE_RD:
shift = 0;
break;
case AARCH64_INSN_REGTYPE_RN:
shift = 5;
break;
case AARCH64_INSN_REGTYPE_RT2:
case AARCH64_INSN_REGTYPE_RA:
shift = 10;
break;
case AARCH64_INSN_REGTYPE_RM:
shift = 16;
break;
default:
pr_err("%s: unknown register type encoding %d\n", __func__,
type);
return 0;
}
return (insn >> shift) & GENMASK(4, 0);
}
static u32 aarch64_insn_encode_register(enum aarch64_insn_register_type type,
u32 insn,
enum aarch64_insn_register reg)
{
int shift;
if (insn == AARCH64_BREAK_FAULT)
return AARCH64_BREAK_FAULT;
if (reg < AARCH64_INSN_REG_0 || reg > AARCH64_INSN_REG_SP) {
pr_err("%s: unknown register encoding %d\n", __func__, reg);
return AARCH64_BREAK_FAULT;
}
switch (type) {
case AARCH64_INSN_REGTYPE_RT:
case AARCH64_INSN_REGTYPE_RD:
shift = 0;
break;
case AARCH64_INSN_REGTYPE_RN:
shift = 5;
break;
case AARCH64_INSN_REGTYPE_RT2:
case AARCH64_INSN_REGTYPE_RA:
shift = 10;
break;
case AARCH64_INSN_REGTYPE_RM:
case AARCH64_INSN_REGTYPE_RS:
shift = 16;
break;
default:
pr_err("%s: unknown register type encoding %d\n", __func__,
type);
return AARCH64_BREAK_FAULT;
}
insn &= ~(GENMASK(4, 0) << shift);
insn |= reg << shift;
return insn;
}
static const u32 aarch64_insn_ldst_size[] = {
[AARCH64_INSN_SIZE_8] = 0,
[AARCH64_INSN_SIZE_16] = 1,
[AARCH64_INSN_SIZE_32] = 2,
[AARCH64_INSN_SIZE_64] = 3,
};
static u32 aarch64_insn_encode_ldst_size(enum aarch64_insn_size_type type,
u32 insn)
{
u32 size;
if (type < AARCH64_INSN_SIZE_8 || type > AARCH64_INSN_SIZE_64) {
pr_err("%s: unknown size encoding %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
size = aarch64_insn_ldst_size[type];
insn &= ~GENMASK(31, 30);
insn |= size << 30;
return insn;
}
static inline long label_imm_common(unsigned long pc, unsigned long addr,
long range)
{
long offset;
if ((pc & 0x3) || (addr & 0x3)) {
pr_err("%s: A64 instructions must be word aligned\n", __func__);
return range;
}
offset = ((long)addr - (long)pc);
if (offset < -range || offset >= range) {
pr_err("%s: offset out of range\n", __func__);
return range;
}
return offset;
}
u32 __kprobes aarch64_insn_gen_branch_imm(unsigned long pc, unsigned long addr,
enum aarch64_insn_branch_type type)
{
u32 insn;
long offset;
/*
* B/BL support [-128M, 128M) offset
* ARM64 virtual address arrangement guarantees all kernel and module
* texts are within +/-128M.
*/
offset = label_imm_common(pc, addr, SZ_128M);
if (offset >= SZ_128M)
return AARCH64_BREAK_FAULT;
switch (type) {
case AARCH64_INSN_BRANCH_LINK:
insn = aarch64_insn_get_bl_value();
break;
case AARCH64_INSN_BRANCH_NOLINK:
insn = aarch64_insn_get_b_value();
break;
default:
pr_err("%s: unknown branch encoding %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_26, insn,
offset >> 2);
}
u32 aarch64_insn_gen_comp_branch_imm(unsigned long pc, unsigned long addr,
enum aarch64_insn_register reg,
enum aarch64_insn_variant variant,
enum aarch64_insn_branch_type type)
{
u32 insn;
long offset;
offset = label_imm_common(pc, addr, SZ_1M);
if (offset >= SZ_1M)
return AARCH64_BREAK_FAULT;
switch (type) {
case AARCH64_INSN_BRANCH_COMP_ZERO:
insn = aarch64_insn_get_cbz_value();
break;
case AARCH64_INSN_BRANCH_COMP_NONZERO:
insn = aarch64_insn_get_cbnz_value();
break;
default:
pr_err("%s: unknown branch encoding %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
switch (variant) {
case AARCH64_INSN_VARIANT_32BIT:
break;
case AARCH64_INSN_VARIANT_64BIT:
insn |= AARCH64_INSN_SF_BIT;
break;
default:
pr_err("%s: unknown variant encoding %d\n", __func__, variant);
return AARCH64_BREAK_FAULT;
}
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RT, insn, reg);
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_19, insn,
offset >> 2);
}
u32 aarch64_insn_gen_cond_branch_imm(unsigned long pc, unsigned long addr,
enum aarch64_insn_condition cond)
{
u32 insn;
long offset;
offset = label_imm_common(pc, addr, SZ_1M);
insn = aarch64_insn_get_bcond_value();
if (cond < AARCH64_INSN_COND_EQ || cond > AARCH64_INSN_COND_AL) {
pr_err("%s: unknown condition encoding %d\n", __func__, cond);
return AARCH64_BREAK_FAULT;
}
insn |= cond;
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_19, insn,
offset >> 2);
}
u32 aarch64_insn_gen_branch_reg(enum aarch64_insn_register reg,
enum aarch64_insn_branch_type type)
{
u32 insn;
switch (type) {
case AARCH64_INSN_BRANCH_NOLINK:
insn = aarch64_insn_get_br_value();
break;
case AARCH64_INSN_BRANCH_LINK:
insn = aarch64_insn_get_blr_value();
break;
case AARCH64_INSN_BRANCH_RETURN:
insn = aarch64_insn_get_ret_value();
break;
default:
pr_err("%s: unknown branch encoding %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
return aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, reg);
}
u32 aarch64_insn_gen_load_store_reg(enum aarch64_insn_register reg,
enum aarch64_insn_register base,
enum aarch64_insn_register offset,
enum aarch64_insn_size_type size,
enum aarch64_insn_ldst_type type)
{
u32 insn;
switch (type) {
case AARCH64_INSN_LDST_LOAD_REG_OFFSET:
insn = aarch64_insn_get_ldr_reg_value();
break;
case AARCH64_INSN_LDST_SIGNED_LOAD_REG_OFFSET:
insn = aarch64_insn_get_signed_ldr_reg_value();
break;
case AARCH64_INSN_LDST_STORE_REG_OFFSET:
insn = aarch64_insn_get_str_reg_value();
break;
default:
pr_err("%s: unknown load/store encoding %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
insn = aarch64_insn_encode_ldst_size(size, insn);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RT, insn, reg);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn,
base);
return aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RM, insn,
offset);
}
u32 aarch64_insn_gen_load_store_imm(enum aarch64_insn_register reg,
enum aarch64_insn_register base,
unsigned int imm,
enum aarch64_insn_size_type size,
enum aarch64_insn_ldst_type type)
{
u32 insn;
u32 shift;
if (size < AARCH64_INSN_SIZE_8 || size > AARCH64_INSN_SIZE_64) {
pr_err("%s: unknown size encoding %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
shift = aarch64_insn_ldst_size[size];
if (imm & ~(BIT(12 + shift) - BIT(shift))) {
pr_err("%s: invalid imm: %d\n", __func__, imm);
return AARCH64_BREAK_FAULT;
}
imm >>= shift;
switch (type) {
case AARCH64_INSN_LDST_LOAD_IMM_OFFSET:
insn = aarch64_insn_get_ldr_imm_value();
break;
case AARCH64_INSN_LDST_SIGNED_LOAD_IMM_OFFSET:
insn = aarch64_insn_get_signed_load_imm_value();
break;
case AARCH64_INSN_LDST_STORE_IMM_OFFSET:
insn = aarch64_insn_get_str_imm_value();
break;
default:
pr_err("%s: unknown load/store encoding %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
insn = aarch64_insn_encode_ldst_size(size, insn);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RT, insn, reg);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn,
base);
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_12, insn, imm);
}
u32 aarch64_insn_gen_load_literal(unsigned long pc, unsigned long addr,
enum aarch64_insn_register reg,
bool is64bit)
{
u32 insn;
long offset;
offset = label_imm_common(pc, addr, SZ_1M);
if (offset >= SZ_1M)
return AARCH64_BREAK_FAULT;
insn = aarch64_insn_get_ldr_lit_value();
if (is64bit)
insn |= BIT(30);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RT, insn, reg);
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_19, insn,
offset >> 2);
}
u32 aarch64_insn_gen_load_store_pair(enum aarch64_insn_register reg1,
enum aarch64_insn_register reg2,
enum aarch64_insn_register base,
int offset,
enum aarch64_insn_variant variant,
enum aarch64_insn_ldst_type type)
{
u32 insn;
int shift;
switch (type) {
case AARCH64_INSN_LDST_LOAD_PAIR_PRE_INDEX:
insn = aarch64_insn_get_ldp_pre_value();
break;
case AARCH64_INSN_LDST_STORE_PAIR_PRE_INDEX:
insn = aarch64_insn_get_stp_pre_value();
break;
case AARCH64_INSN_LDST_LOAD_PAIR_POST_INDEX:
insn = aarch64_insn_get_ldp_post_value();
break;
case AARCH64_INSN_LDST_STORE_PAIR_POST_INDEX:
insn = aarch64_insn_get_stp_post_value();
break;
default:
pr_err("%s: unknown load/store encoding %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
switch (variant) {
case AARCH64_INSN_VARIANT_32BIT:
if ((offset & 0x3) || (offset < -256) || (offset > 252)) {
pr_err("%s: offset must be multiples of 4 in the range of [-256, 252] %d\n",
__func__, offset);
return AARCH64_BREAK_FAULT;
}
shift = 2;
break;
case AARCH64_INSN_VARIANT_64BIT:
if ((offset & 0x7) || (offset < -512) || (offset > 504)) {
pr_err("%s: offset must be multiples of 8 in the range of [-512, 504] %d\n",
__func__, offset);
return AARCH64_BREAK_FAULT;
}
shift = 3;
insn |= AARCH64_INSN_SF_BIT;
break;
default:
pr_err("%s: unknown variant encoding %d\n", __func__, variant);
return AARCH64_BREAK_FAULT;
}
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RT, insn,
reg1);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RT2, insn,
reg2);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn,
base);
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_7, insn,
offset >> shift);
}
u32 aarch64_insn_gen_load_store_ex(enum aarch64_insn_register reg,
enum aarch64_insn_register base,
enum aarch64_insn_register state,
enum aarch64_insn_size_type size,
enum aarch64_insn_ldst_type type)
{
u32 insn;
switch (type) {
case AARCH64_INSN_LDST_LOAD_EX:
case AARCH64_INSN_LDST_LOAD_ACQ_EX:
insn = aarch64_insn_get_load_ex_value();
if (type == AARCH64_INSN_LDST_LOAD_ACQ_EX)
insn |= BIT(15);
break;
case AARCH64_INSN_LDST_STORE_EX:
case AARCH64_INSN_LDST_STORE_REL_EX:
insn = aarch64_insn_get_store_ex_value();
if (type == AARCH64_INSN_LDST_STORE_REL_EX)
insn |= BIT(15);
break;
default:
pr_err("%s: unknown load/store exclusive encoding %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
insn = aarch64_insn_encode_ldst_size(size, insn);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RT, insn,
reg);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn,
base);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RT2, insn,
AARCH64_INSN_REG_ZR);
return aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RS, insn,
state);
}
#ifdef CONFIG_ARM64_LSE_ATOMICS
static u32 aarch64_insn_encode_ldst_order(enum aarch64_insn_mem_order_type type,
u32 insn)
{
u32 order;
switch (type) {
case AARCH64_INSN_MEM_ORDER_NONE:
order = 0;
break;
case AARCH64_INSN_MEM_ORDER_ACQ:
order = 2;
break;
case AARCH64_INSN_MEM_ORDER_REL:
order = 1;
break;
case AARCH64_INSN_MEM_ORDER_ACQREL:
order = 3;
break;
default:
pr_err("%s: unknown mem order %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
insn &= ~GENMASK(23, 22);
insn |= order << 22;
return insn;
}
u32 aarch64_insn_gen_atomic_ld_op(enum aarch64_insn_register result,
enum aarch64_insn_register address,
enum aarch64_insn_register value,
enum aarch64_insn_size_type size,
enum aarch64_insn_mem_atomic_op op,
enum aarch64_insn_mem_order_type order)
{
u32 insn;
switch (op) {
case AARCH64_INSN_MEM_ATOMIC_ADD:
insn = aarch64_insn_get_ldadd_value();
break;
case AARCH64_INSN_MEM_ATOMIC_CLR:
insn = aarch64_insn_get_ldclr_value();
break;
case AARCH64_INSN_MEM_ATOMIC_EOR:
insn = aarch64_insn_get_ldeor_value();
break;
case AARCH64_INSN_MEM_ATOMIC_SET:
insn = aarch64_insn_get_ldset_value();
break;
case AARCH64_INSN_MEM_ATOMIC_SWP:
insn = aarch64_insn_get_swp_value();
break;
default:
pr_err("%s: unimplemented mem atomic op %d\n", __func__, op);
return AARCH64_BREAK_FAULT;
}
switch (size) {
case AARCH64_INSN_SIZE_32:
case AARCH64_INSN_SIZE_64:
break;
default:
pr_err("%s: unimplemented size encoding %d\n", __func__, size);
return AARCH64_BREAK_FAULT;
}
insn = aarch64_insn_encode_ldst_size(size, insn);
insn = aarch64_insn_encode_ldst_order(order, insn);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RT, insn,
result);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn,
address);
return aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RS, insn,
value);
}
static u32 aarch64_insn_encode_cas_order(enum aarch64_insn_mem_order_type type,
u32 insn)
{
u32 order;
switch (type) {
case AARCH64_INSN_MEM_ORDER_NONE:
order = 0;
break;
case AARCH64_INSN_MEM_ORDER_ACQ:
order = BIT(22);
break;
case AARCH64_INSN_MEM_ORDER_REL:
order = BIT(15);
break;
case AARCH64_INSN_MEM_ORDER_ACQREL:
order = BIT(15) | BIT(22);
break;
default:
pr_err("%s: unknown mem order %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
insn &= ~(BIT(15) | BIT(22));
insn |= order;
return insn;
}
u32 aarch64_insn_gen_cas(enum aarch64_insn_register result,
enum aarch64_insn_register address,
enum aarch64_insn_register value,
enum aarch64_insn_size_type size,
enum aarch64_insn_mem_order_type order)
{
u32 insn;
switch (size) {
case AARCH64_INSN_SIZE_32:
case AARCH64_INSN_SIZE_64:
break;
default:
pr_err("%s: unimplemented size encoding %d\n", __func__, size);
return AARCH64_BREAK_FAULT;
}
insn = aarch64_insn_get_cas_value();
insn = aarch64_insn_encode_ldst_size(size, insn);
insn = aarch64_insn_encode_cas_order(order, insn);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RT, insn,
result);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn,
address);
return aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RS, insn,
value);
}
#endif
u32 aarch64_insn_gen_add_sub_imm(enum aarch64_insn_register dst,
enum aarch64_insn_register src,
int imm, enum aarch64_insn_variant variant,
enum aarch64_insn_adsb_type type)
{
u32 insn;
switch (type) {
case AARCH64_INSN_ADSB_ADD:
insn = aarch64_insn_get_add_imm_value();
break;
case AARCH64_INSN_ADSB_SUB:
insn = aarch64_insn_get_sub_imm_value();
break;
case AARCH64_INSN_ADSB_ADD_SETFLAGS:
insn = aarch64_insn_get_adds_imm_value();
break;
case AARCH64_INSN_ADSB_SUB_SETFLAGS:
insn = aarch64_insn_get_subs_imm_value();
break;
default:
pr_err("%s: unknown add/sub encoding %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
switch (variant) {
case AARCH64_INSN_VARIANT_32BIT:
break;
case AARCH64_INSN_VARIANT_64BIT:
insn |= AARCH64_INSN_SF_BIT;
break;
default:
pr_err("%s: unknown variant encoding %d\n", __func__, variant);
return AARCH64_BREAK_FAULT;
}
/* We can't encode more than a 24bit value (12bit + 12bit shift) */
if (imm & ~(BIT(24) - 1))
goto out;
/* If we have something in the top 12 bits... */
if (imm & ~(SZ_4K - 1)) {
/* ... and in the low 12 bits -> error */
if (imm & (SZ_4K - 1))
goto out;
imm >>= 12;
insn |= AARCH64_INSN_LSL_12;
}
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, src);
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_12, insn, imm);
out:
pr_err("%s: invalid immediate encoding %d\n", __func__, imm);
return AARCH64_BREAK_FAULT;
}
u32 aarch64_insn_gen_bitfield(enum aarch64_insn_register dst,
enum aarch64_insn_register src,
int immr, int imms,
enum aarch64_insn_variant variant,
enum aarch64_insn_bitfield_type type)
{
u32 insn;
u32 mask;
switch (type) {
case AARCH64_INSN_BITFIELD_MOVE:
insn = aarch64_insn_get_bfm_value();
break;
case AARCH64_INSN_BITFIELD_MOVE_UNSIGNED:
insn = aarch64_insn_get_ubfm_value();
break;
case AARCH64_INSN_BITFIELD_MOVE_SIGNED:
insn = aarch64_insn_get_sbfm_value();
break;
default:
pr_err("%s: unknown bitfield encoding %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
switch (variant) {
case AARCH64_INSN_VARIANT_32BIT:
mask = GENMASK(4, 0);
break;
case AARCH64_INSN_VARIANT_64BIT:
insn |= AARCH64_INSN_SF_BIT | AARCH64_INSN_N_BIT;
mask = GENMASK(5, 0);
break;
default:
pr_err("%s: unknown variant encoding %d\n", __func__, variant);
return AARCH64_BREAK_FAULT;
}
if (immr & ~mask) {
pr_err("%s: invalid immr encoding %d\n", __func__, immr);
return AARCH64_BREAK_FAULT;
}
if (imms & ~mask) {
pr_err("%s: invalid imms encoding %d\n", __func__, imms);
return AARCH64_BREAK_FAULT;
}
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, src);
insn = aarch64_insn_encode_immediate(AARCH64_INSN_IMM_R, insn, immr);
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_S, insn, imms);
}
u32 aarch64_insn_gen_movewide(enum aarch64_insn_register dst,
int imm, int shift,
enum aarch64_insn_variant variant,
enum aarch64_insn_movewide_type type)
{
u32 insn;
switch (type) {
case AARCH64_INSN_MOVEWIDE_ZERO:
insn = aarch64_insn_get_movz_value();
break;
case AARCH64_INSN_MOVEWIDE_KEEP:
insn = aarch64_insn_get_movk_value();
break;
case AARCH64_INSN_MOVEWIDE_INVERSE:
insn = aarch64_insn_get_movn_value();
break;
default:
pr_err("%s: unknown movewide encoding %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
if (imm & ~(SZ_64K - 1)) {
pr_err("%s: invalid immediate encoding %d\n", __func__, imm);
return AARCH64_BREAK_FAULT;
}
switch (variant) {
case AARCH64_INSN_VARIANT_32BIT:
if (shift != 0 && shift != 16) {
pr_err("%s: invalid shift encoding %d\n", __func__,
shift);
return AARCH64_BREAK_FAULT;
}
break;
case AARCH64_INSN_VARIANT_64BIT:
insn |= AARCH64_INSN_SF_BIT;
if (shift != 0 && shift != 16 && shift != 32 && shift != 48) {
pr_err("%s: invalid shift encoding %d\n", __func__,
shift);
return AARCH64_BREAK_FAULT;
}
break;
default:
pr_err("%s: unknown variant encoding %d\n", __func__, variant);
return AARCH64_BREAK_FAULT;
}
insn |= (shift >> 4) << 21;
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst);
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_16, insn, imm);
}
u32 aarch64_insn_gen_add_sub_shifted_reg(enum aarch64_insn_register dst,
enum aarch64_insn_register src,
enum aarch64_insn_register reg,
int shift,
enum aarch64_insn_variant variant,
enum aarch64_insn_adsb_type type)
{
u32 insn;
switch (type) {
case AARCH64_INSN_ADSB_ADD:
insn = aarch64_insn_get_add_value();
break;
case AARCH64_INSN_ADSB_SUB:
insn = aarch64_insn_get_sub_value();
break;
case AARCH64_INSN_ADSB_ADD_SETFLAGS:
insn = aarch64_insn_get_adds_value();
break;
case AARCH64_INSN_ADSB_SUB_SETFLAGS:
insn = aarch64_insn_get_subs_value();
break;
default:
pr_err("%s: unknown add/sub encoding %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
switch (variant) {
case AARCH64_INSN_VARIANT_32BIT:
if (shift & ~(SZ_32 - 1)) {
pr_err("%s: invalid shift encoding %d\n", __func__,
shift);
return AARCH64_BREAK_FAULT;
}
break;
case AARCH64_INSN_VARIANT_64BIT:
insn |= AARCH64_INSN_SF_BIT;
if (shift & ~(SZ_64 - 1)) {
pr_err("%s: invalid shift encoding %d\n", __func__,
shift);
return AARCH64_BREAK_FAULT;
}
break;
default:
pr_err("%s: unknown variant encoding %d\n", __func__, variant);
return AARCH64_BREAK_FAULT;
}
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, src);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RM, insn, reg);
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_6, insn, shift);
}
u32 aarch64_insn_gen_data1(enum aarch64_insn_register dst,
enum aarch64_insn_register src,
enum aarch64_insn_variant variant,
enum aarch64_insn_data1_type type)
{
u32 insn;
switch (type) {
case AARCH64_INSN_DATA1_REVERSE_16:
insn = aarch64_insn_get_rev16_value();
break;
case AARCH64_INSN_DATA1_REVERSE_32:
insn = aarch64_insn_get_rev32_value();
break;
case AARCH64_INSN_DATA1_REVERSE_64:
if (variant != AARCH64_INSN_VARIANT_64BIT) {
pr_err("%s: invalid variant for reverse64 %d\n",
__func__, variant);
return AARCH64_BREAK_FAULT;
}
insn = aarch64_insn_get_rev64_value();
break;
default:
pr_err("%s: unknown data1 encoding %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
switch (variant) {
case AARCH64_INSN_VARIANT_32BIT:
break;
case AARCH64_INSN_VARIANT_64BIT:
insn |= AARCH64_INSN_SF_BIT;
break;
default:
pr_err("%s: unknown variant encoding %d\n", __func__, variant);
return AARCH64_BREAK_FAULT;
}
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst);
return aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, src);
}
u32 aarch64_insn_gen_data2(enum aarch64_insn_register dst,
enum aarch64_insn_register src,
enum aarch64_insn_register reg,
enum aarch64_insn_variant variant,
enum aarch64_insn_data2_type type)
{
u32 insn;
switch (type) {
case AARCH64_INSN_DATA2_UDIV:
insn = aarch64_insn_get_udiv_value();
break;
case AARCH64_INSN_DATA2_SDIV:
insn = aarch64_insn_get_sdiv_value();
break;
case AARCH64_INSN_DATA2_LSLV:
insn = aarch64_insn_get_lslv_value();
break;
case AARCH64_INSN_DATA2_LSRV:
insn = aarch64_insn_get_lsrv_value();
break;
case AARCH64_INSN_DATA2_ASRV:
insn = aarch64_insn_get_asrv_value();
break;
case AARCH64_INSN_DATA2_RORV:
insn = aarch64_insn_get_rorv_value();
break;
default:
pr_err("%s: unknown data2 encoding %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
switch (variant) {
case AARCH64_INSN_VARIANT_32BIT:
break;
case AARCH64_INSN_VARIANT_64BIT:
insn |= AARCH64_INSN_SF_BIT;
break;
default:
pr_err("%s: unknown variant encoding %d\n", __func__, variant);
return AARCH64_BREAK_FAULT;
}
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, src);
return aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RM, insn, reg);
}
u32 aarch64_insn_gen_data3(enum aarch64_insn_register dst,
enum aarch64_insn_register src,
enum aarch64_insn_register reg1,
enum aarch64_insn_register reg2,
enum aarch64_insn_variant variant,
enum aarch64_insn_data3_type type)
{
u32 insn;
switch (type) {
case AARCH64_INSN_DATA3_MADD:
insn = aarch64_insn_get_madd_value();
break;
case AARCH64_INSN_DATA3_MSUB:
insn = aarch64_insn_get_msub_value();
break;
default:
pr_err("%s: unknown data3 encoding %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
switch (variant) {
case AARCH64_INSN_VARIANT_32BIT:
break;
case AARCH64_INSN_VARIANT_64BIT:
insn |= AARCH64_INSN_SF_BIT;
break;
default:
pr_err("%s: unknown variant encoding %d\n", __func__, variant);
return AARCH64_BREAK_FAULT;
}
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RA, insn, src);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn,
reg1);
return aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RM, insn,
reg2);
}
u32 aarch64_insn_gen_logical_shifted_reg(enum aarch64_insn_register dst,
enum aarch64_insn_register src,
enum aarch64_insn_register reg,
int shift,
enum aarch64_insn_variant variant,
enum aarch64_insn_logic_type type)
{
u32 insn;
switch (type) {
case AARCH64_INSN_LOGIC_AND:
insn = aarch64_insn_get_and_value();
break;
case AARCH64_INSN_LOGIC_BIC:
insn = aarch64_insn_get_bic_value();
break;
case AARCH64_INSN_LOGIC_ORR:
insn = aarch64_insn_get_orr_value();
break;
case AARCH64_INSN_LOGIC_ORN:
insn = aarch64_insn_get_orn_value();
break;
case AARCH64_INSN_LOGIC_EOR:
insn = aarch64_insn_get_eor_value();
break;
case AARCH64_INSN_LOGIC_EON:
insn = aarch64_insn_get_eon_value();
break;
case AARCH64_INSN_LOGIC_AND_SETFLAGS:
insn = aarch64_insn_get_ands_value();
break;
case AARCH64_INSN_LOGIC_BIC_SETFLAGS:
insn = aarch64_insn_get_bics_value();
break;
default:
pr_err("%s: unknown logical encoding %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
switch (variant) {
case AARCH64_INSN_VARIANT_32BIT:
if (shift & ~(SZ_32 - 1)) {
pr_err("%s: invalid shift encoding %d\n", __func__,
shift);
return AARCH64_BREAK_FAULT;
}
break;
case AARCH64_INSN_VARIANT_64BIT:
insn |= AARCH64_INSN_SF_BIT;
if (shift & ~(SZ_64 - 1)) {
pr_err("%s: invalid shift encoding %d\n", __func__,
shift);
return AARCH64_BREAK_FAULT;
}
break;
default:
pr_err("%s: unknown variant encoding %d\n", __func__, variant);
return AARCH64_BREAK_FAULT;
}
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, src);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RM, insn, reg);
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_6, insn, shift);
}
/*
* MOV (register) is architecturally an alias of ORR (shifted register) where
* MOV <*d>, <*m> is equivalent to ORR <*d>, <*ZR>, <*m>
*/
u32 aarch64_insn_gen_move_reg(enum aarch64_insn_register dst,
enum aarch64_insn_register src,
enum aarch64_insn_variant variant)
{
return aarch64_insn_gen_logical_shifted_reg(dst, AARCH64_INSN_REG_ZR,
src, 0, variant,
AARCH64_INSN_LOGIC_ORR);
}
u32 aarch64_insn_gen_adr(unsigned long pc, unsigned long addr,
enum aarch64_insn_register reg,
enum aarch64_insn_adr_type type)
{
u32 insn;
s32 offset;
switch (type) {
case AARCH64_INSN_ADR_TYPE_ADR:
insn = aarch64_insn_get_adr_value();
offset = addr - pc;
break;
case AARCH64_INSN_ADR_TYPE_ADRP:
insn = aarch64_insn_get_adrp_value();
offset = (addr - ALIGN_DOWN(pc, SZ_4K)) >> 12;
break;
default:
pr_err("%s: unknown adr encoding %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
if (offset < -SZ_1M || offset >= SZ_1M)
return AARCH64_BREAK_FAULT;
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, reg);
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_ADR, insn, offset);
}
/*
* Decode the imm field of a branch, and return the byte offset as a
* signed value (so it can be used when computing a new branch
* target).
*/
s32 aarch64_get_branch_offset(u32 insn)
{
s32 imm;
if (aarch64_insn_is_b(insn) || aarch64_insn_is_bl(insn)) {
imm = aarch64_insn_decode_immediate(AARCH64_INSN_IMM_26, insn);
return (imm << 6) >> 4;
}
if (aarch64_insn_is_cbz(insn) || aarch64_insn_is_cbnz(insn) ||
aarch64_insn_is_bcond(insn)) {
imm = aarch64_insn_decode_immediate(AARCH64_INSN_IMM_19, insn);
return (imm << 13) >> 11;
}
if (aarch64_insn_is_tbz(insn) || aarch64_insn_is_tbnz(insn)) {
imm = aarch64_insn_decode_immediate(AARCH64_INSN_IMM_14, insn);
return (imm << 18) >> 16;
}
/* Unhandled instruction */
BUG();
}
/*
* Encode the displacement of a branch in the imm field and return the
* updated instruction.
*/
u32 aarch64_set_branch_offset(u32 insn, s32 offset)
{
if (aarch64_insn_is_b(insn) || aarch64_insn_is_bl(insn))
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_26, insn,
offset >> 2);
if (aarch64_insn_is_cbz(insn) || aarch64_insn_is_cbnz(insn) ||
aarch64_insn_is_bcond(insn))
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_19, insn,
offset >> 2);
if (aarch64_insn_is_tbz(insn) || aarch64_insn_is_tbnz(insn))
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_14, insn,
offset >> 2);
/* Unhandled instruction */
BUG();
}
s32 aarch64_insn_adrp_get_offset(u32 insn)
{
BUG_ON(!aarch64_insn_is_adrp(insn));
return aarch64_insn_decode_immediate(AARCH64_INSN_IMM_ADR, insn) << 12;
}
u32 aarch64_insn_adrp_set_offset(u32 insn, s32 offset)
{
BUG_ON(!aarch64_insn_is_adrp(insn));
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_ADR, insn,
offset >> 12);
}
/*
* Extract the Op/CR data from a msr/mrs instruction.
*/
u32 aarch64_insn_extract_system_reg(u32 insn)
{
return (insn & 0x1FFFE0) >> 5;
}
bool aarch32_insn_is_wide(u32 insn)
{
return insn >= 0xe800;
}
/*
* Macros/defines for extracting register numbers from instruction.
*/
u32 aarch32_insn_extract_reg_num(u32 insn, int offset)
{
return (insn & (0xf << offset)) >> offset;
}
#define OPC2_MASK 0x7
#define OPC2_OFFSET 5
u32 aarch32_insn_mcr_extract_opc2(u32 insn)
{
return (insn & (OPC2_MASK << OPC2_OFFSET)) >> OPC2_OFFSET;
}
#define CRM_MASK 0xf
u32 aarch32_insn_mcr_extract_crm(u32 insn)
{
return insn & CRM_MASK;
}
static bool range_of_ones(u64 val)
{
/* Doesn't handle full ones or full zeroes */
u64 sval = val >> __ffs64(val);
/* One of Sean Eron Anderson's bithack tricks */
return ((sval + 1) & (sval)) == 0;
}
static u32 aarch64_encode_immediate(u64 imm,
enum aarch64_insn_variant variant,
u32 insn)
{
unsigned int immr, imms, n, ones, ror, esz, tmp;
u64 mask;
switch (variant) {
case AARCH64_INSN_VARIANT_32BIT:
esz = 32;
break;
case AARCH64_INSN_VARIANT_64BIT:
insn |= AARCH64_INSN_SF_BIT;
esz = 64;
break;
default:
pr_err("%s: unknown variant encoding %d\n", __func__, variant);
return AARCH64_BREAK_FAULT;
}
mask = GENMASK(esz - 1, 0);
/* Can't encode full zeroes, full ones, or value wider than the mask */
if (!imm || imm == mask || imm & ~mask)
return AARCH64_BREAK_FAULT;
/*
* Inverse of Replicate(). Try to spot a repeating pattern
* with a pow2 stride.
*/
for (tmp = esz / 2; tmp >= 2; tmp /= 2) {
u64 emask = BIT(tmp) - 1;
if ((imm & emask) != ((imm >> tmp) & emask))
break;
esz = tmp;
mask = emask;
}
/* N is only set if we're encoding a 64bit value */
n = esz == 64;
/* Trim imm to the element size */
imm &= mask;
/* That's how many ones we need to encode */
ones = hweight64(imm);
/*
* imms is set to (ones - 1), prefixed with a string of ones
* and a zero if they fit. Cap it to 6 bits.
*/
imms = ones - 1;
imms |= 0xf << ffs(esz);
imms &= BIT(6) - 1;
/* Compute the rotation */
if (range_of_ones(imm)) {
/*
* Pattern: 0..01..10..0
*
* Compute how many rotate we need to align it right
*/
ror = __ffs64(imm);
} else {
/*
* Pattern: 0..01..10..01..1
*
* Fill the unused top bits with ones, and check if
* the result is a valid immediate (all ones with a
* contiguous ranges of zeroes).
*/
imm |= ~mask;
if (!range_of_ones(~imm))
return AARCH64_BREAK_FAULT;
/*
* Compute the rotation to get a continuous set of
* ones, with the first bit set at position 0
*/
ror = fls64(~imm);
}
/*
* immr is the number of bits we need to rotate back to the
* original set of ones. Note that this is relative to the
* element size...
*/
immr = (esz - ror) % esz;
insn = aarch64_insn_encode_immediate(AARCH64_INSN_IMM_N, insn, n);
insn = aarch64_insn_encode_immediate(AARCH64_INSN_IMM_R, insn, immr);
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_S, insn, imms);
}
u32 aarch64_insn_gen_logical_immediate(enum aarch64_insn_logic_type type,
enum aarch64_insn_variant variant,
enum aarch64_insn_register Rn,
enum aarch64_insn_register Rd,
u64 imm)
{
u32 insn;
switch (type) {
case AARCH64_INSN_LOGIC_AND:
insn = aarch64_insn_get_and_imm_value();
break;
case AARCH64_INSN_LOGIC_ORR:
insn = aarch64_insn_get_orr_imm_value();
break;
case AARCH64_INSN_LOGIC_EOR:
insn = aarch64_insn_get_eor_imm_value();
break;
case AARCH64_INSN_LOGIC_AND_SETFLAGS:
insn = aarch64_insn_get_ands_imm_value();
break;
default:
pr_err("%s: unknown logical encoding %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, Rd);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, Rn);
return aarch64_encode_immediate(imm, variant, insn);
}
u32 aarch64_insn_gen_extr(enum aarch64_insn_variant variant,
enum aarch64_insn_register Rm,
enum aarch64_insn_register Rn,
enum aarch64_insn_register Rd,
u8 lsb)
{
u32 insn;
insn = aarch64_insn_get_extr_value();
switch (variant) {
case AARCH64_INSN_VARIANT_32BIT:
if (lsb > 31)
return AARCH64_BREAK_FAULT;
break;
case AARCH64_INSN_VARIANT_64BIT:
if (lsb > 63)
return AARCH64_BREAK_FAULT;
insn |= AARCH64_INSN_SF_BIT;
insn = aarch64_insn_encode_immediate(AARCH64_INSN_IMM_N, insn, 1);
break;
default:
pr_err("%s: unknown variant encoding %d\n", __func__, variant);
return AARCH64_BREAK_FAULT;
}
insn = aarch64_insn_encode_immediate(AARCH64_INSN_IMM_S, insn, lsb);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, Rd);
insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, Rn);
return aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RM, insn, Rm);
}
u32 aarch64_insn_gen_dmb(enum aarch64_insn_mb_type type)
{
u32 opt;
u32 insn;
switch (type) {
case AARCH64_INSN_MB_SY:
opt = 0xf;
break;
case AARCH64_INSN_MB_ST:
opt = 0xe;
break;
case AARCH64_INSN_MB_LD:
opt = 0xd;
break;
case AARCH64_INSN_MB_ISH:
opt = 0xb;
break;
case AARCH64_INSN_MB_ISHST:
opt = 0xa;
break;
case AARCH64_INSN_MB_ISHLD:
opt = 0x9;
break;
case AARCH64_INSN_MB_NSH:
opt = 0x7;
break;
case AARCH64_INSN_MB_NSHST:
opt = 0x6;
break;
case AARCH64_INSN_MB_NSHLD:
opt = 0x5;
break;
default:
pr_err("%s: unknown dmb type %d\n", __func__, type);
return AARCH64_BREAK_FAULT;
}
insn = aarch64_insn_get_dmb_value();
insn &= ~GENMASK(11, 8);
insn |= (opt << 8);
return insn;
}
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