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linux/arch/arm64/net/bpf_jit.h
Xu Kuohai 68b18191fe bpf, arm64: Support signed div/mod instructions 
Add JIT for signed div/mod instructions.

Signed-off-by: Xu Kuohai <xukuohai@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Florent Revest <revest@chromium.org>
Acked-by: Florent Revest <revest@chromium.org>
Link: https://lore.kernel.org/bpf/20230815154158.717901-7-xukuohai@huaweicloud.com
2023-08-18 15:46:35 +02:00

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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* BPF JIT compiler for ARM64
*
* Copyright (C) 2014-2016 Zi Shen Lim <zlim.lnx@gmail.com>
*/
#ifndef _BPF_JIT_H
#define _BPF_JIT_H
#include <asm/insn.h>
/* 5-bit Register Operand */
#define A64_R(x) AARCH64_INSN_REG_##x
#define A64_FP AARCH64_INSN_REG_FP
#define A64_LR AARCH64_INSN_REG_LR
#define A64_ZR AARCH64_INSN_REG_ZR
#define A64_SP AARCH64_INSN_REG_SP
#define A64_VARIANT(sf) \
((sf) ? AARCH64_INSN_VARIANT_64BIT : AARCH64_INSN_VARIANT_32BIT)
/* Compare & branch (immediate) */
#define A64_COMP_BRANCH(sf, Rt, offset, type) \
aarch64_insn_gen_comp_branch_imm(0, offset, Rt, A64_VARIANT(sf), \
AARCH64_INSN_BRANCH_COMP_##type)
#define A64_CBZ(sf, Rt, imm19) A64_COMP_BRANCH(sf, Rt, (imm19) << 2, ZERO)
#define A64_CBNZ(sf, Rt, imm19) A64_COMP_BRANCH(sf, Rt, (imm19) << 2, NONZERO)
/* Conditional branch (immediate) */
#define A64_COND_BRANCH(cond, offset) \
aarch64_insn_gen_cond_branch_imm(0, offset, cond)
#define A64_COND_EQ AARCH64_INSN_COND_EQ /* == */
#define A64_COND_NE AARCH64_INSN_COND_NE /* != */
#define A64_COND_CS AARCH64_INSN_COND_CS /* unsigned >= */
#define A64_COND_HI AARCH64_INSN_COND_HI /* unsigned > */
#define A64_COND_LS AARCH64_INSN_COND_LS /* unsigned <= */
#define A64_COND_CC AARCH64_INSN_COND_CC /* unsigned < */
#define A64_COND_GE AARCH64_INSN_COND_GE /* signed >= */
#define A64_COND_GT AARCH64_INSN_COND_GT /* signed > */
#define A64_COND_LE AARCH64_INSN_COND_LE /* signed <= */
#define A64_COND_LT AARCH64_INSN_COND_LT /* signed < */
#define A64_B_(cond, imm19) A64_COND_BRANCH(cond, (imm19) << 2)
/* Unconditional branch (immediate) */
#define A64_BRANCH(offset, type) aarch64_insn_gen_branch_imm(0, offset, \
AARCH64_INSN_BRANCH_##type)
#define A64_B(imm26) A64_BRANCH((imm26) << 2, NOLINK)
#define A64_BL(imm26) A64_BRANCH((imm26) << 2, LINK)
/* Unconditional branch (register) */
#define A64_BR(Rn) aarch64_insn_gen_branch_reg(Rn, AARCH64_INSN_BRANCH_NOLINK)
#define A64_BLR(Rn) aarch64_insn_gen_branch_reg(Rn, AARCH64_INSN_BRANCH_LINK)
#define A64_RET(Rn) aarch64_insn_gen_branch_reg(Rn, AARCH64_INSN_BRANCH_RETURN)
/* Load/store register (register offset) */
#define A64_LS_REG(Rt, Rn, Rm, size, type) \
aarch64_insn_gen_load_store_reg(Rt, Rn, Rm, \
AARCH64_INSN_SIZE_##size, \
AARCH64_INSN_LDST_##type##_REG_OFFSET)
#define A64_STRB(Wt, Xn, Xm) A64_LS_REG(Wt, Xn, Xm, 8, STORE)
#define A64_LDRB(Wt, Xn, Xm) A64_LS_REG(Wt, Xn, Xm, 8, LOAD)
#define A64_LDRSB(Xt, Xn, Xm) A64_LS_REG(Xt, Xn, Xm, 8, SIGNED_LOAD)
#define A64_STRH(Wt, Xn, Xm) A64_LS_REG(Wt, Xn, Xm, 16, STORE)
#define A64_LDRH(Wt, Xn, Xm) A64_LS_REG(Wt, Xn, Xm, 16, LOAD)
#define A64_LDRSH(Xt, Xn, Xm) A64_LS_REG(Xt, Xn, Xm, 16, SIGNED_LOAD)
#define A64_STR32(Wt, Xn, Xm) A64_LS_REG(Wt, Xn, Xm, 32, STORE)
#define A64_LDR32(Wt, Xn, Xm) A64_LS_REG(Wt, Xn, Xm, 32, LOAD)
#define A64_LDRSW(Xt, Xn, Xm) A64_LS_REG(Xt, Xn, Xm, 32, SIGNED_LOAD)
#define A64_STR64(Xt, Xn, Xm) A64_LS_REG(Xt, Xn, Xm, 64, STORE)
#define A64_LDR64(Xt, Xn, Xm) A64_LS_REG(Xt, Xn, Xm, 64, LOAD)
/* Load/store register (immediate offset) */
#define A64_LS_IMM(Rt, Rn, imm, size, type) \
aarch64_insn_gen_load_store_imm(Rt, Rn, imm, \
AARCH64_INSN_SIZE_##size, \
AARCH64_INSN_LDST_##type##_IMM_OFFSET)
#define A64_STRBI(Wt, Xn, imm) A64_LS_IMM(Wt, Xn, imm, 8, STORE)
#define A64_LDRBI(Wt, Xn, imm) A64_LS_IMM(Wt, Xn, imm, 8, LOAD)
#define A64_LDRSBI(Xt, Xn, imm) A64_LS_IMM(Xt, Xn, imm, 8, SIGNED_LOAD)
#define A64_STRHI(Wt, Xn, imm) A64_LS_IMM(Wt, Xn, imm, 16, STORE)
#define A64_LDRHI(Wt, Xn, imm) A64_LS_IMM(Wt, Xn, imm, 16, LOAD)
#define A64_LDRSHI(Xt, Xn, imm) A64_LS_IMM(Xt, Xn, imm, 16, SIGNED_LOAD)
#define A64_STR32I(Wt, Xn, imm) A64_LS_IMM(Wt, Xn, imm, 32, STORE)
#define A64_LDR32I(Wt, Xn, imm) A64_LS_IMM(Wt, Xn, imm, 32, LOAD)
#define A64_LDRSWI(Xt, Xn, imm) A64_LS_IMM(Xt, Xn, imm, 32, SIGNED_LOAD)
#define A64_STR64I(Xt, Xn, imm) A64_LS_IMM(Xt, Xn, imm, 64, STORE)
#define A64_LDR64I(Xt, Xn, imm) A64_LS_IMM(Xt, Xn, imm, 64, LOAD)
/* LDR (literal) */
#define A64_LDR32LIT(Wt, offset) \
aarch64_insn_gen_load_literal(0, offset, Wt, false)
#define A64_LDR64LIT(Xt, offset) \
aarch64_insn_gen_load_literal(0, offset, Xt, true)
/* Load/store register pair */
#define A64_LS_PAIR(Rt, Rt2, Rn, offset, ls, type) \
aarch64_insn_gen_load_store_pair(Rt, Rt2, Rn, offset, \
AARCH64_INSN_VARIANT_64BIT, \
AARCH64_INSN_LDST_##ls##_PAIR_##type)
/* Rn -= 16; Rn[0] = Rt; Rn[8] = Rt2; */
#define A64_PUSH(Rt, Rt2, Rn) A64_LS_PAIR(Rt, Rt2, Rn, -16, STORE, PRE_INDEX)
/* Rt = Rn[0]; Rt2 = Rn[8]; Rn += 16; */
#define A64_POP(Rt, Rt2, Rn) A64_LS_PAIR(Rt, Rt2, Rn, 16, LOAD, POST_INDEX)
/* Load/store exclusive */
#define A64_SIZE(sf) \
((sf) ? AARCH64_INSN_SIZE_64 : AARCH64_INSN_SIZE_32)
#define A64_LSX(sf, Rt, Rn, Rs, type) \
aarch64_insn_gen_load_store_ex(Rt, Rn, Rs, A64_SIZE(sf), \
AARCH64_INSN_LDST_##type)
/* Rt = [Rn]; (atomic) */
#define A64_LDXR(sf, Rt, Rn) \
A64_LSX(sf, Rt, Rn, A64_ZR, LOAD_EX)
/* [Rn] = Rt; (atomic) Rs = [state] */
#define A64_STXR(sf, Rt, Rn, Rs) \
A64_LSX(sf, Rt, Rn, Rs, STORE_EX)
/* [Rn] = Rt (store release); (atomic) Rs = [state] */
#define A64_STLXR(sf, Rt, Rn, Rs) \
aarch64_insn_gen_load_store_ex(Rt, Rn, Rs, A64_SIZE(sf), \
AARCH64_INSN_LDST_STORE_REL_EX)
/*
* LSE atomics
*
* ST{ADD,CLR,SET,EOR} is simply encoded as an alias for
* LDD{ADD,CLR,SET,EOR} with XZR as the destination register.
*/
#define A64_ST_OP(sf, Rn, Rs, op) \
aarch64_insn_gen_atomic_ld_op(A64_ZR, Rn, Rs, \
A64_SIZE(sf), AARCH64_INSN_MEM_ATOMIC_##op, \
AARCH64_INSN_MEM_ORDER_NONE)
/* [Rn] <op>= Rs */
#define A64_STADD(sf, Rn, Rs) A64_ST_OP(sf, Rn, Rs, ADD)
#define A64_STCLR(sf, Rn, Rs) A64_ST_OP(sf, Rn, Rs, CLR)
#define A64_STEOR(sf, Rn, Rs) A64_ST_OP(sf, Rn, Rs, EOR)
#define A64_STSET(sf, Rn, Rs) A64_ST_OP(sf, Rn, Rs, SET)
#define A64_LD_OP_AL(sf, Rt, Rn, Rs, op) \
aarch64_insn_gen_atomic_ld_op(Rt, Rn, Rs, \
A64_SIZE(sf), AARCH64_INSN_MEM_ATOMIC_##op, \
AARCH64_INSN_MEM_ORDER_ACQREL)
/* Rt = [Rn] (load acquire); [Rn] <op>= Rs (store release) */
#define A64_LDADDAL(sf, Rt, Rn, Rs) A64_LD_OP_AL(sf, Rt, Rn, Rs, ADD)
#define A64_LDCLRAL(sf, Rt, Rn, Rs) A64_LD_OP_AL(sf, Rt, Rn, Rs, CLR)
#define A64_LDEORAL(sf, Rt, Rn, Rs) A64_LD_OP_AL(sf, Rt, Rn, Rs, EOR)
#define A64_LDSETAL(sf, Rt, Rn, Rs) A64_LD_OP_AL(sf, Rt, Rn, Rs, SET)
/* Rt = [Rn] (load acquire); [Rn] = Rs (store release) */
#define A64_SWPAL(sf, Rt, Rn, Rs) A64_LD_OP_AL(sf, Rt, Rn, Rs, SWP)
/* Rs = CAS(Rn, Rs, Rt) (load acquire & store release) */
#define A64_CASAL(sf, Rt, Rn, Rs) \
aarch64_insn_gen_cas(Rt, Rn, Rs, A64_SIZE(sf), \
AARCH64_INSN_MEM_ORDER_ACQREL)
/* Add/subtract (immediate) */
#define A64_ADDSUB_IMM(sf, Rd, Rn, imm12, type) \
aarch64_insn_gen_add_sub_imm(Rd, Rn, imm12, \
A64_VARIANT(sf), AARCH64_INSN_ADSB_##type)
/* Rd = Rn OP imm12 */
#define A64_ADD_I(sf, Rd, Rn, imm12) A64_ADDSUB_IMM(sf, Rd, Rn, imm12, ADD)
#define A64_SUB_I(sf, Rd, Rn, imm12) A64_ADDSUB_IMM(sf, Rd, Rn, imm12, SUB)
#define A64_ADDS_I(sf, Rd, Rn, imm12) \
A64_ADDSUB_IMM(sf, Rd, Rn, imm12, ADD_SETFLAGS)
#define A64_SUBS_I(sf, Rd, Rn, imm12) \
A64_ADDSUB_IMM(sf, Rd, Rn, imm12, SUB_SETFLAGS)
/* Rn + imm12; set condition flags */
#define A64_CMN_I(sf, Rn, imm12) A64_ADDS_I(sf, A64_ZR, Rn, imm12)
/* Rn - imm12; set condition flags */
#define A64_CMP_I(sf, Rn, imm12) A64_SUBS_I(sf, A64_ZR, Rn, imm12)
/* Rd = Rn */
#define A64_MOV(sf, Rd, Rn) A64_ADD_I(sf, Rd, Rn, 0)
/* Bitfield move */
#define A64_BITFIELD(sf, Rd, Rn, immr, imms, type) \
aarch64_insn_gen_bitfield(Rd, Rn, immr, imms, \
A64_VARIANT(sf), AARCH64_INSN_BITFIELD_MOVE_##type)
/* Signed, with sign replication to left and zeros to right */
#define A64_SBFM(sf, Rd, Rn, ir, is) A64_BITFIELD(sf, Rd, Rn, ir, is, SIGNED)
/* Unsigned, with zeros to left and right */
#define A64_UBFM(sf, Rd, Rn, ir, is) A64_BITFIELD(sf, Rd, Rn, ir, is, UNSIGNED)
/* Rd = Rn << shift */
#define A64_LSL(sf, Rd, Rn, shift) ({ \
int sz = (sf) ? 64 : 32; \
A64_UBFM(sf, Rd, Rn, (unsigned)-(shift) % sz, sz - 1 - (shift)); \
})
/* Rd = Rn >> shift */
#define A64_LSR(sf, Rd, Rn, shift) A64_UBFM(sf, Rd, Rn, shift, (sf) ? 63 : 31)
/* Rd = Rn >> shift; signed */
#define A64_ASR(sf, Rd, Rn, shift) A64_SBFM(sf, Rd, Rn, shift, (sf) ? 63 : 31)
/* Zero extend */
#define A64_UXTH(sf, Rd, Rn) A64_UBFM(sf, Rd, Rn, 0, 15)
#define A64_UXTW(sf, Rd, Rn) A64_UBFM(sf, Rd, Rn, 0, 31)
/* Sign extend */
#define A64_SXTB(sf, Rd, Rn) A64_SBFM(sf, Rd, Rn, 0, 7)
#define A64_SXTH(sf, Rd, Rn) A64_SBFM(sf, Rd, Rn, 0, 15)
#define A64_SXTW(sf, Rd, Rn) A64_SBFM(sf, Rd, Rn, 0, 31)
/* Move wide (immediate) */
#define A64_MOVEW(sf, Rd, imm16, shift, type) \
aarch64_insn_gen_movewide(Rd, imm16, shift, \
A64_VARIANT(sf), AARCH64_INSN_MOVEWIDE_##type)
/* Rd = Zeros (for MOVZ);
* Rd |= imm16 << shift (where shift is {0, 16, 32, 48});
* Rd = ~Rd; (for MOVN); */
#define A64_MOVN(sf, Rd, imm16, shift) A64_MOVEW(sf, Rd, imm16, shift, INVERSE)
#define A64_MOVZ(sf, Rd, imm16, shift) A64_MOVEW(sf, Rd, imm16, shift, ZERO)
#define A64_MOVK(sf, Rd, imm16, shift) A64_MOVEW(sf, Rd, imm16, shift, KEEP)
/* Add/subtract (shifted register) */
#define A64_ADDSUB_SREG(sf, Rd, Rn, Rm, type) \
aarch64_insn_gen_add_sub_shifted_reg(Rd, Rn, Rm, 0, \
A64_VARIANT(sf), AARCH64_INSN_ADSB_##type)
/* Rd = Rn OP Rm */
#define A64_ADD(sf, Rd, Rn, Rm) A64_ADDSUB_SREG(sf, Rd, Rn, Rm, ADD)
#define A64_SUB(sf, Rd, Rn, Rm) A64_ADDSUB_SREG(sf, Rd, Rn, Rm, SUB)
#define A64_SUBS(sf, Rd, Rn, Rm) A64_ADDSUB_SREG(sf, Rd, Rn, Rm, SUB_SETFLAGS)
/* Rd = -Rm */
#define A64_NEG(sf, Rd, Rm) A64_SUB(sf, Rd, A64_ZR, Rm)
/* Rn - Rm; set condition flags */
#define A64_CMP(sf, Rn, Rm) A64_SUBS(sf, A64_ZR, Rn, Rm)
/* Data-processing (1 source) */
#define A64_DATA1(sf, Rd, Rn, type) aarch64_insn_gen_data1(Rd, Rn, \
A64_VARIANT(sf), AARCH64_INSN_DATA1_##type)
/* Rd = BSWAPx(Rn) */
#define A64_REV16(sf, Rd, Rn) A64_DATA1(sf, Rd, Rn, REVERSE_16)
#define A64_REV32(sf, Rd, Rn) A64_DATA1(sf, Rd, Rn, REVERSE_32)
#define A64_REV64(Rd, Rn) A64_DATA1(1, Rd, Rn, REVERSE_64)
/* Data-processing (2 source) */
/* Rd = Rn OP Rm */
#define A64_DATA2(sf, Rd, Rn, Rm, type) aarch64_insn_gen_data2(Rd, Rn, Rm, \
A64_VARIANT(sf), AARCH64_INSN_DATA2_##type)
#define A64_UDIV(sf, Rd, Rn, Rm) A64_DATA2(sf, Rd, Rn, Rm, UDIV)
#define A64_SDIV(sf, Rd, Rn, Rm) A64_DATA2(sf, Rd, Rn, Rm, SDIV)
#define A64_LSLV(sf, Rd, Rn, Rm) A64_DATA2(sf, Rd, Rn, Rm, LSLV)
#define A64_LSRV(sf, Rd, Rn, Rm) A64_DATA2(sf, Rd, Rn, Rm, LSRV)
#define A64_ASRV(sf, Rd, Rn, Rm) A64_DATA2(sf, Rd, Rn, Rm, ASRV)
/* Data-processing (3 source) */
/* Rd = Ra + Rn * Rm */
#define A64_MADD(sf, Rd, Ra, Rn, Rm) aarch64_insn_gen_data3(Rd, Ra, Rn, Rm, \
A64_VARIANT(sf), AARCH64_INSN_DATA3_MADD)
/* Rd = Ra - Rn * Rm */
#define A64_MSUB(sf, Rd, Ra, Rn, Rm) aarch64_insn_gen_data3(Rd, Ra, Rn, Rm, \
A64_VARIANT(sf), AARCH64_INSN_DATA3_MSUB)
/* Rd = Rn * Rm */
#define A64_MUL(sf, Rd, Rn, Rm) A64_MADD(sf, Rd, A64_ZR, Rn, Rm)
/* Logical (shifted register) */
#define A64_LOGIC_SREG(sf, Rd, Rn, Rm, type) \
aarch64_insn_gen_logical_shifted_reg(Rd, Rn, Rm, 0, \
A64_VARIANT(sf), AARCH64_INSN_LOGIC_##type)
/* Rd = Rn OP Rm */
#define A64_AND(sf, Rd, Rn, Rm) A64_LOGIC_SREG(sf, Rd, Rn, Rm, AND)
#define A64_ORR(sf, Rd, Rn, Rm) A64_LOGIC_SREG(sf, Rd, Rn, Rm, ORR)
#define A64_EOR(sf, Rd, Rn, Rm) A64_LOGIC_SREG(sf, Rd, Rn, Rm, EOR)
#define A64_ANDS(sf, Rd, Rn, Rm) A64_LOGIC_SREG(sf, Rd, Rn, Rm, AND_SETFLAGS)
/* Rn & Rm; set condition flags */
#define A64_TST(sf, Rn, Rm) A64_ANDS(sf, A64_ZR, Rn, Rm)
/* Rd = ~Rm (alias of ORN with A64_ZR as Rn) */
#define A64_MVN(sf, Rd, Rm) \
A64_LOGIC_SREG(sf, Rd, A64_ZR, Rm, ORN)
/* Logical (immediate) */
#define A64_LOGIC_IMM(sf, Rd, Rn, imm, type) ({ \
u64 imm64 = (sf) ? (u64)imm : (u64)(u32)imm; \
aarch64_insn_gen_logical_immediate(AARCH64_INSN_LOGIC_##type, \
A64_VARIANT(sf), Rn, Rd, imm64); \
})
/* Rd = Rn OP imm */
#define A64_AND_I(sf, Rd, Rn, imm) A64_LOGIC_IMM(sf, Rd, Rn, imm, AND)
#define A64_ORR_I(sf, Rd, Rn, imm) A64_LOGIC_IMM(sf, Rd, Rn, imm, ORR)
#define A64_EOR_I(sf, Rd, Rn, imm) A64_LOGIC_IMM(sf, Rd, Rn, imm, EOR)
#define A64_ANDS_I(sf, Rd, Rn, imm) A64_LOGIC_IMM(sf, Rd, Rn, imm, AND_SETFLAGS)
/* Rn & imm; set condition flags */
#define A64_TST_I(sf, Rn, imm) A64_ANDS_I(sf, A64_ZR, Rn, imm)
/* HINTs */
#define A64_HINT(x) aarch64_insn_gen_hint(x)
#define A64_PACIASP A64_HINT(AARCH64_INSN_HINT_PACIASP)
#define A64_AUTIASP A64_HINT(AARCH64_INSN_HINT_AUTIASP)
/* BTI */
#define A64_BTI_C A64_HINT(AARCH64_INSN_HINT_BTIC)
#define A64_BTI_J A64_HINT(AARCH64_INSN_HINT_BTIJ)
#define A64_BTI_JC A64_HINT(AARCH64_INSN_HINT_BTIJC)
#define A64_NOP A64_HINT(AARCH64_INSN_HINT_NOP)
/* DMB */
#define A64_DMB_ISH aarch64_insn_gen_dmb(AARCH64_INSN_MB_ISH)
/* ADR */
#define A64_ADR(Rd, offset) \
aarch64_insn_gen_adr(0, offset, Rd, AARCH64_INSN_ADR_TYPE_ADR)
#endif /* _BPF_JIT_H */
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