arch/arm64/net/bpf_jit.h

   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_LS     AARCH64_INSN_COND_LS /* unsigned <= */
  48 #define A64_COND_CC     AARCH64_INSN_COND_CC /* unsigned < */
  49 #define A64_COND_GE     AARCH64_INSN_COND_GE /* signed >= */
  50 #define A64_COND_GT     AARCH64_INSN_COND_GT /* signed > */
  51 #define A64_COND_LE     AARCH64_INSN_COND_LE /* signed <= */
  52 #define A64_COND_LT     AARCH64_INSN_COND_LT /* signed < */
  53 #define A64_B_(cond, imm19) A64_COND_BRANCH(cond, (imm19) << 2)
  54
  55 /* Unconditional branch (immediate) */
  56 #define A64_BRANCH(offset, type) aarch64_insn_gen_branch_imm(0, offset, \
  57         AARCH64_INSN_BRANCH_##type)
  58 #define A64_B(imm26)  A64_BRANCH((imm26) << 2, NOLINK)
  59 #define A64_BL(imm26) A64_BRANCH((imm26) << 2, LINK)
  60
  61 /* Unconditional branch (register) */
  62 #define A64_BR(Rn)  aarch64_insn_gen_branch_reg(Rn, AARCH64_INSN_BRANCH_NOLINK)
  63 #define A64_BLR(Rn) aarch64_insn_gen_branch_reg(Rn, AARCH64_INSN_BRANCH_LINK)
  64 #define A64_RET(Rn) aarch64_insn_gen_branch_reg(Rn, AARCH64_INSN_BRANCH_RETURN)
  65
  66 /* Load/store register (register offset) */
  67 #define A64_LS_REG(Rt, Rn, Rm, size, type) \
  68         aarch64_insn_gen_load_store_reg(Rt, Rn, Rm, \
  69                 AARCH64_INSN_SIZE_##size, \
  70                 AARCH64_INSN_LDST_##type##_REG_OFFSET)
  71 #define A64_STRB(Wt, Xn, Xm)  A64_LS_REG(Wt, Xn, Xm, 8, STORE)
  72 #define A64_LDRB(Wt, Xn, Xm)  A64_LS_REG(Wt, Xn, Xm, 8, LOAD)
  73 #define A64_STRH(Wt, Xn, Xm)  A64_LS_REG(Wt, Xn, Xm, 16, STORE)
  74 #define A64_LDRH(Wt, Xn, Xm)  A64_LS_REG(Wt, Xn, Xm, 16, LOAD)
  75 #define A64_STR32(Wt, Xn, Xm) A64_LS_REG(Wt, Xn, Xm, 32, STORE)
  76 #define A64_LDR32(Wt, Xn, Xm) A64_LS_REG(Wt, Xn, Xm, 32, LOAD)
  77 #define A64_STR64(Xt, Xn, Xm) A64_LS_REG(Xt, Xn, Xm, 64, STORE)
  78 #define A64_LDR64(Xt, Xn, Xm) A64_LS_REG(Xt, Xn, Xm, 64, LOAD)
  79
  80 /* Load/store register pair */
  81 #define A64_LS_PAIR(Rt, Rt2, Rn, offset, ls, type) \
  82         aarch64_insn_gen_load_store_pair(Rt, Rt2, Rn, offset, \
  83                 AARCH64_INSN_VARIANT_64BIT, \
  84                 AARCH64_INSN_LDST_##ls##_PAIR_##type)
  85 /* Rn -= 16; Rn[0] = Rt; Rn[8] = Rt2; */
  86 #define A64_PUSH(Rt, Rt2, Rn) A64_LS_PAIR(Rt, Rt2, Rn, -16, STORE, PRE_INDEX)
  87 /* Rt = Rn[0]; Rt2 = Rn[8]; Rn += 16; */
  88 #define A64_POP(Rt, Rt2, Rn)  A64_LS_PAIR(Rt, Rt2, Rn, 16, LOAD, POST_INDEX)
  89
  90 /* Load/store exclusive */
  91 #define A64_SIZE(sf) \
  92         ((sf) ? AARCH64_INSN_SIZE_64 : AARCH64_INSN_SIZE_32)
  93 #define A64_LSX(sf, Rt, Rn, Rs, type) \
  94         aarch64_insn_gen_load_store_ex(Rt, Rn, Rs, A64_SIZE(sf), \
  95                                        AARCH64_INSN_LDST_##type)
  96 /* Rt = [Rn]; (atomic) */
  97 #define A64_LDXR(sf, Rt, Rn) \
  98         A64_LSX(sf, Rt, Rn, A64_ZR, LOAD_EX)
  99 /* [Rn] = Rt; (atomic) Rs = [state] */
 100 #define A64_STXR(sf, Rt, Rn, Rs) \
 101         A64_LSX(sf, Rt, Rn, Rs, STORE_EX)
 102
 103 /* LSE atomics */
 104 #define A64_STADD(sf, Rn, Rs) \
 105         aarch64_insn_gen_stadd(Rn, Rs, A64_SIZE(sf))
 106
 107 /* Add/subtract (immediate) */
 108 #define A64_ADDSUB_IMM(sf, Rd, Rn, imm12, type) \
 109         aarch64_insn_gen_add_sub_imm(Rd, Rn, imm12, \
 110                 A64_VARIANT(sf), AARCH64_INSN_ADSB_##type)
 111 /* Rd = Rn OP imm12 */
 112 #define A64_ADD_I(sf, Rd, Rn, imm12) A64_ADDSUB_IMM(sf, Rd, Rn, imm12, ADD)
 113 #define A64_SUB_I(sf, Rd, Rn, imm12) A64_ADDSUB_IMM(sf, Rd, Rn, imm12, SUB)
 114 /* Rd = Rn */
 115 #define A64_MOV(sf, Rd, Rn) A64_ADD_I(sf, Rd, Rn, 0)
 116
 117 /* Bitfield move */
 118 #define A64_BITFIELD(sf, Rd, Rn, immr, imms, type) \
 119         aarch64_insn_gen_bitfield(Rd, Rn, immr, imms, \
 120                 A64_VARIANT(sf), AARCH64_INSN_BITFIELD_MOVE_##type)
 121 /* Signed, with sign replication to left and zeros to right */
 122 #define A64_SBFM(sf, Rd, Rn, ir, is) A64_BITFIELD(sf, Rd, Rn, ir, is, SIGNED)
 123 /* Unsigned, with zeros to left and right */
 124 #define A64_UBFM(sf, Rd, Rn, ir, is) A64_BITFIELD(sf, Rd, Rn, ir, is, UNSIGNED)
 125
 126 /* Rd = Rn << shift */
 127 #define A64_LSL(sf, Rd, Rn, shift) ({   \
 128         int sz = (sf) ? 64 : 32;        \
 129         A64_UBFM(sf, Rd, Rn, (unsigned)-(shift) % sz, sz - 1 - (shift)); \
 130 })
 131 /* Rd = Rn >> shift */
 132 #define A64_LSR(sf, Rd, Rn, shift) A64_UBFM(sf, Rd, Rn, shift, (sf) ? 63 : 31)
 133 /* Rd = Rn >> shift; signed */
 134 #define A64_ASR(sf, Rd, Rn, shift) A64_SBFM(sf, Rd, Rn, shift, (sf) ? 63 : 31)
 135
 136 /* Zero extend */
 137 #define A64_UXTH(sf, Rd, Rn) A64_UBFM(sf, Rd, Rn, 0, 15)
 138 #define A64_UXTW(sf, Rd, Rn) A64_UBFM(sf, Rd, Rn, 0, 31)
 139
 140 /* Move wide (immediate) */
 141 #define A64_MOVEW(sf, Rd, imm16, shift, type) \
 142         aarch64_insn_gen_movewide(Rd, imm16, shift, \
 143                 A64_VARIANT(sf), AARCH64_INSN_MOVEWIDE_##type)
 144 /* Rd = Zeros (for MOVZ);
 145  * Rd |= imm16 << shift (where shift is {0, 16, 32, 48});
 146  * Rd = ~Rd; (for MOVN); */
 147 #define A64_MOVN(sf, Rd, imm16, shift) A64_MOVEW(sf, Rd, imm16, shift, INVERSE)
 148 #define A64_MOVZ(sf, Rd, imm16, shift) A64_MOVEW(sf, Rd, imm16, shift, ZERO)
 149 #define A64_MOVK(sf, Rd, imm16, shift) A64_MOVEW(sf, Rd, imm16, shift, KEEP)
 150
 151 /* Add/subtract (shifted register) */
 152 #define A64_ADDSUB_SREG(sf, Rd, Rn, Rm, type) \
 153         aarch64_insn_gen_add_sub_shifted_reg(Rd, Rn, Rm, 0, \
 154                 A64_VARIANT(sf), AARCH64_INSN_ADSB_##type)
 155 /* Rd = Rn OP Rm */
 156 #define A64_ADD(sf, Rd, Rn, Rm)  A64_ADDSUB_SREG(sf, Rd, Rn, Rm, ADD)
 157 #define A64_SUB(sf, Rd, Rn, Rm)  A64_ADDSUB_SREG(sf, Rd, Rn, Rm, SUB)
 158 #define A64_SUBS(sf, Rd, Rn, Rm) A64_ADDSUB_SREG(sf, Rd, Rn, Rm, SUB_SETFLAGS)
 159 /* Rd = -Rm */
 160 #define A64_NEG(sf, Rd, Rm) A64_SUB(sf, Rd, A64_ZR, Rm)
 161 /* Rn - Rm; set condition flags */
 162 #define A64_CMP(sf, Rn, Rm) A64_SUBS(sf, A64_ZR, Rn, Rm)
 163
 164 /* Data-processing (1 source) */
 165 #define A64_DATA1(sf, Rd, Rn, type) aarch64_insn_gen_data1(Rd, Rn, \
 166         A64_VARIANT(sf), AARCH64_INSN_DATA1_##type)
 167 /* Rd = BSWAPx(Rn) */
 168 #define A64_REV16(sf, Rd, Rn) A64_DATA1(sf, Rd, Rn, REVERSE_16)
 169 #define A64_REV32(sf, Rd, Rn) A64_DATA1(sf, Rd, Rn, REVERSE_32)
 170 #define A64_REV64(Rd, Rn)     A64_DATA1(1, Rd, Rn, REVERSE_64)
 171
 172 /* Data-processing (2 source) */
 173 /* Rd = Rn OP Rm */
 174 #define A64_DATA2(sf, Rd, Rn, Rm, type) aarch64_insn_gen_data2(Rd, Rn, Rm, \
 175         A64_VARIANT(sf), AARCH64_INSN_DATA2_##type)
 176 #define A64_UDIV(sf, Rd, Rn, Rm) A64_DATA2(sf, Rd, Rn, Rm, UDIV)
 177 #define A64_LSLV(sf, Rd, Rn, Rm) A64_DATA2(sf, Rd, Rn, Rm, LSLV)
 178 #define A64_LSRV(sf, Rd, Rn, Rm) A64_DATA2(sf, Rd, Rn, Rm, LSRV)
 179 #define A64_ASRV(sf, Rd, Rn, Rm) A64_DATA2(sf, Rd, Rn, Rm, ASRV)
 180
 181 /* Data-processing (3 source) */
 182 /* Rd = Ra + Rn * Rm */
 183 #define A64_MADD(sf, Rd, Ra, Rn, Rm) aarch64_insn_gen_data3(Rd, Ra, Rn, Rm, \
 184         A64_VARIANT(sf), AARCH64_INSN_DATA3_MADD)
 185 /* Rd = Rn * Rm */
 186 #define A64_MUL(sf, Rd, Rn, Rm) A64_MADD(sf, Rd, A64_ZR, Rn, Rm)
 187
 188 /* Logical (shifted register) */
 189 #define A64_LOGIC_SREG(sf, Rd, Rn, Rm, type) \
 190         aarch64_insn_gen_logical_shifted_reg(Rd, Rn, Rm, 0, \
 191                 A64_VARIANT(sf), AARCH64_INSN_LOGIC_##type)
 192 /* Rd = Rn OP Rm */
 193 #define A64_AND(sf, Rd, Rn, Rm)  A64_LOGIC_SREG(sf, Rd, Rn, Rm, AND)
 194 #define A64_ORR(sf, Rd, Rn, Rm)  A64_LOGIC_SREG(sf, Rd, Rn, Rm, ORR)
 195 #define A64_EOR(sf, Rd, Rn, Rm)  A64_LOGIC_SREG(sf, Rd, Rn, Rm, EOR)
 196 #define A64_ANDS(sf, Rd, Rn, Rm) A64_LOGIC_SREG(sf, Rd, Rn, Rm, AND_SETFLAGS)
 197 /* Rn & Rm; set condition flags */
 198 #define A64_TST(sf, Rn, Rm) A64_ANDS(sf, A64_ZR, Rn, Rm)
 199
 200 #endif /* _BPF_JIT_H */