1 /* 2 * BPF JIT compiler for ARM64 3 * 4 * Copyright (C) 2014-2016 Zi Shen Lim <zlim.lnx@gmail.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 #ifndef _BPF_JIT_H 19 #define _BPF_JIT_H 20 21 #include <asm/insn.h> 22 23 /* 5-bit Register Operand */ 24 #define A64_R(x) AARCH64_INSN_REG_##x 25 #define A64_FP AARCH64_INSN_REG_FP 26 #define A64_LR AARCH64_INSN_REG_LR 27 #define A64_ZR AARCH64_INSN_REG_ZR 28 #define A64_SP AARCH64_INSN_REG_SP 29 30 #define A64_VARIANT(sf) \ 31 ((sf) ? AARCH64_INSN_VARIANT_64BIT : AARCH64_INSN_VARIANT_32BIT) 32 33 /* Compare & branch (immediate) */ 34 #define A64_COMP_BRANCH(sf, Rt, offset, type) \ 35 aarch64_insn_gen_comp_branch_imm(0, offset, Rt, A64_VARIANT(sf), \ 36 AARCH64_INSN_BRANCH_COMP_##type) 37 #define A64_CBZ(sf, Rt, imm19) A64_COMP_BRANCH(sf, Rt, (imm19) << 2, ZERO) 38 #define A64_CBNZ(sf, Rt, imm19) A64_COMP_BRANCH(sf, Rt, (imm19) << 2, NONZERO) 39 40 /* Conditional branch (immediate) */ 41 #define A64_COND_BRANCH(cond, offset) \ 42 aarch64_insn_gen_cond_branch_imm(0, offset, cond) 43 #define A64_COND_EQ AARCH64_INSN_COND_EQ /* == */ 44 #define A64_COND_NE AARCH64_INSN_COND_NE /* != */ 45 #define A64_COND_CS AARCH64_INSN_COND_CS /* unsigned >= */ 46 #define A64_COND_HI AARCH64_INSN_COND_HI /* unsigned > */ 47 #define A64_COND_GE AARCH64_INSN_COND_GE /* signed >= */ 48 #define A64_COND_GT AARCH64_INSN_COND_GT /* signed > */ 49 #define A64_B_(cond, imm19) A64_COND_BRANCH(cond, (imm19) << 2) 50 51 /* Unconditional branch (immediate) */ 52 #define A64_BRANCH(offset, type) aarch64_insn_gen_branch_imm(0, offset, \ 53 AARCH64_INSN_BRANCH_##type) 54 #define A64_B(imm26) A64_BRANCH((imm26) << 2, NOLINK) 55 #define A64_BL(imm26) A64_BRANCH((imm26) << 2, LINK) 56 57 /* Unconditional branch (register) */ 58 #define A64_BR(Rn) aarch64_insn_gen_branch_reg(Rn, AARCH64_INSN_BRANCH_NOLINK) 59 #define A64_BLR(Rn) aarch64_insn_gen_branch_reg(Rn, AARCH64_INSN_BRANCH_LINK) 60 #define A64_RET(Rn) aarch64_insn_gen_branch_reg(Rn, AARCH64_INSN_BRANCH_RETURN) 61 62 /* Load/store register (register offset) */ 63 #define A64_LS_REG(Rt, Rn, Rm, size, type) \ 64 aarch64_insn_gen_load_store_reg(Rt, Rn, Rm, \ 65 AARCH64_INSN_SIZE_##size, \ 66 AARCH64_INSN_LDST_##type##_REG_OFFSET) 67 #define A64_STRB(Wt, Xn, Xm) A64_LS_REG(Wt, Xn, Xm, 8, STORE) 68 #define A64_LDRB(Wt, Xn, Xm) A64_LS_REG(Wt, Xn, Xm, 8, LOAD) 69 #define A64_STRH(Wt, Xn, Xm) A64_LS_REG(Wt, Xn, Xm, 16, STORE) 70 #define A64_LDRH(Wt, Xn, Xm) A64_LS_REG(Wt, Xn, Xm, 16, LOAD) 71 #define A64_STR32(Wt, Xn, Xm) A64_LS_REG(Wt, Xn, Xm, 32, STORE) 72 #define A64_LDR32(Wt, Xn, Xm) A64_LS_REG(Wt, Xn, Xm, 32, LOAD) 73 #define A64_STR64(Xt, Xn, Xm) A64_LS_REG(Xt, Xn, Xm, 64, STORE) 74 #define A64_LDR64(Xt, Xn, Xm) A64_LS_REG(Xt, Xn, Xm, 64, LOAD) 75 76 /* Load/store register pair */ 77 #define A64_LS_PAIR(Rt, Rt2, Rn, offset, ls, type) \ 78 aarch64_insn_gen_load_store_pair(Rt, Rt2, Rn, offset, \ 79 AARCH64_INSN_VARIANT_64BIT, \ 80 AARCH64_INSN_LDST_##ls##_PAIR_##type) 81 /* Rn -= 16; Rn[0] = Rt; Rn[8] = Rt2; */ 82 #define A64_PUSH(Rt, Rt2, Rn) A64_LS_PAIR(Rt, Rt2, Rn, -16, STORE, PRE_INDEX) 83 /* Rt = Rn[0]; Rt2 = Rn[8]; Rn += 16; */ 84 #define A64_POP(Rt, Rt2, Rn) A64_LS_PAIR(Rt, Rt2, Rn, 16, LOAD, POST_INDEX) 85 86 /* Add/subtract (immediate) */ 87 #define A64_ADDSUB_IMM(sf, Rd, Rn, imm12, type) \ 88 aarch64_insn_gen_add_sub_imm(Rd, Rn, imm12, \ 89 A64_VARIANT(sf), AARCH64_INSN_ADSB_##type) 90 /* Rd = Rn OP imm12 */ 91 #define A64_ADD_I(sf, Rd, Rn, imm12) A64_ADDSUB_IMM(sf, Rd, Rn, imm12, ADD) 92 #define A64_SUB_I(sf, Rd, Rn, imm12) A64_ADDSUB_IMM(sf, Rd, Rn, imm12, SUB) 93 /* Rd = Rn */ 94 #define A64_MOV(sf, Rd, Rn) A64_ADD_I(sf, Rd, Rn, 0) 95 96 /* Bitfield move */ 97 #define A64_BITFIELD(sf, Rd, Rn, immr, imms, type) \ 98 aarch64_insn_gen_bitfield(Rd, Rn, immr, imms, \ 99 A64_VARIANT(sf), AARCH64_INSN_BITFIELD_MOVE_##type) 100 /* Signed, with sign replication to left and zeros to right */ 101 #define A64_SBFM(sf, Rd, Rn, ir, is) A64_BITFIELD(sf, Rd, Rn, ir, is, SIGNED) 102 /* Unsigned, with zeros to left and right */ 103 #define A64_UBFM(sf, Rd, Rn, ir, is) A64_BITFIELD(sf, Rd, Rn, ir, is, UNSIGNED) 104 105 /* Rd = Rn << shift */ 106 #define A64_LSL(sf, Rd, Rn, shift) ({ \ 107 int sz = (sf) ? 64 : 32; \ 108 A64_UBFM(sf, Rd, Rn, (unsigned)-(shift) % sz, sz - 1 - (shift)); \ 109 }) 110 /* Rd = Rn >> shift */ 111 #define A64_LSR(sf, Rd, Rn, shift) A64_UBFM(sf, Rd, Rn, shift, (sf) ? 63 : 31) 112 /* Rd = Rn >> shift; signed */ 113 #define A64_ASR(sf, Rd, Rn, shift) A64_SBFM(sf, Rd, Rn, shift, (sf) ? 63 : 31) 114 115 /* Zero extend */ 116 #define A64_UXTH(sf, Rd, Rn) A64_UBFM(sf, Rd, Rn, 0, 15) 117 #define A64_UXTW(sf, Rd, Rn) A64_UBFM(sf, Rd, Rn, 0, 31) 118 119 /* Move wide (immediate) */ 120 #define A64_MOVEW(sf, Rd, imm16, shift, type) \ 121 aarch64_insn_gen_movewide(Rd, imm16, shift, \ 122 A64_VARIANT(sf), AARCH64_INSN_MOVEWIDE_##type) 123 /* Rd = Zeros (for MOVZ); 124 * Rd |= imm16 << shift (where shift is {0, 16, 32, 48}); 125 * Rd = ~Rd; (for MOVN); */ 126 #define A64_MOVN(sf, Rd, imm16, shift) A64_MOVEW(sf, Rd, imm16, shift, INVERSE) 127 #define A64_MOVZ(sf, Rd, imm16, shift) A64_MOVEW(sf, Rd, imm16, shift, ZERO) 128 #define A64_MOVK(sf, Rd, imm16, shift) A64_MOVEW(sf, Rd, imm16, shift, KEEP) 129 130 /* Add/subtract (shifted register) */ 131 #define A64_ADDSUB_SREG(sf, Rd, Rn, Rm, type) \ 132 aarch64_insn_gen_add_sub_shifted_reg(Rd, Rn, Rm, 0, \ 133 A64_VARIANT(sf), AARCH64_INSN_ADSB_##type) 134 /* Rd = Rn OP Rm */ 135 #define A64_ADD(sf, Rd, Rn, Rm) A64_ADDSUB_SREG(sf, Rd, Rn, Rm, ADD) 136 #define A64_SUB(sf, Rd, Rn, Rm) A64_ADDSUB_SREG(sf, Rd, Rn, Rm, SUB) 137 #define A64_SUBS(sf, Rd, Rn, Rm) A64_ADDSUB_SREG(sf, Rd, Rn, Rm, SUB_SETFLAGS) 138 /* Rd = -Rm */ 139 #define A64_NEG(sf, Rd, Rm) A64_SUB(sf, Rd, A64_ZR, Rm) 140 /* Rn - Rm; set condition flags */ 141 #define A64_CMP(sf, Rn, Rm) A64_SUBS(sf, A64_ZR, Rn, Rm) 142 143 /* Data-processing (1 source) */ 144 #define A64_DATA1(sf, Rd, Rn, type) aarch64_insn_gen_data1(Rd, Rn, \ 145 A64_VARIANT(sf), AARCH64_INSN_DATA1_##type) 146 /* Rd = BSWAPx(Rn) */ 147 #define A64_REV16(sf, Rd, Rn) A64_DATA1(sf, Rd, Rn, REVERSE_16) 148 #define A64_REV32(sf, Rd, Rn) A64_DATA1(sf, Rd, Rn, REVERSE_32) 149 #define A64_REV64(Rd, Rn) A64_DATA1(1, Rd, Rn, REVERSE_64) 150 151 /* Data-processing (2 source) */ 152 /* Rd = Rn OP Rm */ 153 #define A64_DATA2(sf, Rd, Rn, Rm, type) aarch64_insn_gen_data2(Rd, Rn, Rm, \ 154 A64_VARIANT(sf), AARCH64_INSN_DATA2_##type) 155 #define A64_UDIV(sf, Rd, Rn, Rm) A64_DATA2(sf, Rd, Rn, Rm, UDIV) 156 #define A64_LSLV(sf, Rd, Rn, Rm) A64_DATA2(sf, Rd, Rn, Rm, LSLV) 157 #define A64_LSRV(sf, Rd, Rn, Rm) A64_DATA2(sf, Rd, Rn, Rm, LSRV) 158 #define A64_ASRV(sf, Rd, Rn, Rm) A64_DATA2(sf, Rd, Rn, Rm, ASRV) 159 160 /* Data-processing (3 source) */ 161 /* Rd = Ra + Rn * Rm */ 162 #define A64_MADD(sf, Rd, Ra, Rn, Rm) aarch64_insn_gen_data3(Rd, Ra, Rn, Rm, \ 163 A64_VARIANT(sf), AARCH64_INSN_DATA3_MADD) 164 /* Rd = Rn * Rm */ 165 #define A64_MUL(sf, Rd, Rn, Rm) A64_MADD(sf, Rd, A64_ZR, Rn, Rm) 166 167 /* Logical (shifted register) */ 168 #define A64_LOGIC_SREG(sf, Rd, Rn, Rm, type) \ 169 aarch64_insn_gen_logical_shifted_reg(Rd, Rn, Rm, 0, \ 170 A64_VARIANT(sf), AARCH64_INSN_LOGIC_##type) 171 /* Rd = Rn OP Rm */ 172 #define A64_AND(sf, Rd, Rn, Rm) A64_LOGIC_SREG(sf, Rd, Rn, Rm, AND) 173 #define A64_ORR(sf, Rd, Rn, Rm) A64_LOGIC_SREG(sf, Rd, Rn, Rm, ORR) 174 #define A64_EOR(sf, Rd, Rn, Rm) A64_LOGIC_SREG(sf, Rd, Rn, Rm, EOR) 175 #define A64_ANDS(sf, Rd, Rn, Rm) A64_LOGIC_SREG(sf, Rd, Rn, Rm, AND_SETFLAGS) 176 /* Rn & Rm; set condition flags */ 177 #define A64_TST(sf, Rn, Rm) A64_ANDS(sf, A64_ZR, Rn, Rm) 178 179 #endif /* _BPF_JIT_H */ 180