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Diffstat (limited to 'target/arm/tcg/t16.decode')
| -rw-r--r-- | target/arm/tcg/t16.decode | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/target/arm/tcg/t16.decode b/target/arm/tcg/t16.decode new file mode 100644 index 0000000000..646c74929d --- /dev/null +++ b/target/arm/tcg/t16.decode @@ -0,0 +1,281 @@ +# Thumb1 instructions +# +# Copyright (c) 2019 Linaro, Ltd +# +# This library is free software; you can redistribute it and/or +# modify it under the terms of the GNU Lesser General Public +# License as published by the Free Software Foundation; either +# version 2.1 of the License, or (at your option) any later version. +# +# This library is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public +# License along with this library; if not, see <http://www.gnu.org/licenses/>. + +# +# This file is processed by scripts/decodetree.py +# + +&empty !extern +&s_rrr_shi !extern s rd rn rm shim shty +&s_rrr_shr !extern s rn rd rm rs shty +&s_rri_rot !extern s rn rd imm rot +&s_rrrr !extern s rd rn rm ra +&rrr_rot !extern rd rn rm rot +&rr !extern rd rm +&ri !extern rd imm +&r !extern rm +&i !extern imm +&ldst_rr !extern p w u rn rt rm shimm shtype +&ldst_ri !extern p w u rn rt imm +&ldst_block !extern rn i b u w list +&setend !extern E +&cps !extern mode imod M A I F +&ci !extern cond imm + +# Set S if the instruction is outside of an IT block. +%s !function=t16_setflags + +# Data-processing (two low registers) + +%reg_0 0:3 + +@lll_noshr ...... .... rm:3 rd:3 \ + &s_rrr_shi %s rn=%reg_0 shim=0 shty=0 +@xll_noshr ...... .... rm:3 rn:3 \ + &s_rrr_shi s=1 rd=0 shim=0 shty=0 +@lxl_shr ...... .... rs:3 rd:3 \ + &s_rrr_shr %s rm=%reg_0 rn=0 + +AND_rrri 010000 0000 ... ... @lll_noshr +EOR_rrri 010000 0001 ... ... @lll_noshr +MOV_rxrr 010000 0010 ... ... @lxl_shr shty=0 # LSL +MOV_rxrr 010000 0011 ... ... @lxl_shr shty=1 # LSR +MOV_rxrr 010000 0100 ... ... @lxl_shr shty=2 # ASR +ADC_rrri 010000 0101 ... ... @lll_noshr +SBC_rrri 010000 0110 ... ... @lll_noshr +MOV_rxrr 010000 0111 ... ... @lxl_shr shty=3 # ROR +TST_xrri 010000 1000 ... ... @xll_noshr +RSB_rri 010000 1001 rn:3 rd:3 &s_rri_rot %s imm=0 rot=0 +CMP_xrri 010000 1010 ... ... @xll_noshr +CMN_xrri 010000 1011 ... ... @xll_noshr +ORR_rrri 010000 1100 ... ... @lll_noshr +MUL 010000 1101 rn:3 rd:3 &s_rrrr %s rm=%reg_0 ra=0 +BIC_rrri 010000 1110 ... ... @lll_noshr +MVN_rxri 010000 1111 ... ... @lll_noshr + +# Load/store (register offset) + +@ldst_rr ....... rm:3 rn:3 rt:3 \ + &ldst_rr p=1 w=0 u=1 shimm=0 shtype=0 + +STR_rr 0101 000 ... ... ... @ldst_rr +STRH_rr 0101 001 ... ... ... @ldst_rr +STRB_rr 0101 010 ... ... ... @ldst_rr +LDRSB_rr 0101 011 ... ... ... @ldst_rr +LDR_rr 0101 100 ... ... ... @ldst_rr +LDRH_rr 0101 101 ... ... ... @ldst_rr +LDRB_rr 0101 110 ... ... ... @ldst_rr +LDRSH_rr 0101 111 ... ... ... @ldst_rr + +# Load/store word/byte (immediate offset) + +%imm5_6x4 6:5 !function=times_4 + +@ldst_ri_1 ..... imm:5 rn:3 rt:3 \ + &ldst_ri p=1 w=0 u=1 +@ldst_ri_4 ..... ..... rn:3 rt:3 \ + &ldst_ri p=1 w=0 u=1 imm=%imm5_6x4 + +STR_ri 01100 ..... ... ... @ldst_ri_4 +LDR_ri 01101 ..... ... ... @ldst_ri_4 +STRB_ri 01110 ..... ... ... @ldst_ri_1 +LDRB_ri 01111 ..... ... ... @ldst_ri_1 + +# Load/store halfword (immediate offset) + +%imm5_6x2 6:5 !function=times_2 +@ldst_ri_2 ..... ..... rn:3 rt:3 \ + &ldst_ri p=1 w=0 u=1 imm=%imm5_6x2 + +STRH_ri 10000 ..... ... ... @ldst_ri_2 +LDRH_ri 10001 ..... ... ... @ldst_ri_2 + +# Load/store (SP-relative) + +%imm8_0x4 0:8 !function=times_4 +@ldst_spec_i ..... rt:3 ........ \ + &ldst_ri p=1 w=0 u=1 imm=%imm8_0x4 + +STR_ri 10010 ... ........ @ldst_spec_i rn=13 +LDR_ri 10011 ... ........ @ldst_spec_i rn=13 + +# Load (PC-relative) + +LDR_ri 01001 ... ........ @ldst_spec_i rn=15 + +# Add PC/SP (immediate) + +ADR 10100 rd:3 ........ imm=%imm8_0x4 +ADD_rri 10101 rd:3 ........ \ + &s_rri_rot rn=13 s=0 rot=0 imm=%imm8_0x4 # SP + +# Load/store multiple + +@ldstm ..... rn:3 list:8 &ldst_block i=1 b=0 u=0 w=1 + +STM 11000 ... ........ @ldstm +LDM_t16 11001 ... ........ @ldstm + +# Shift (immediate) + +@shift_i ..... shim:5 rm:3 rd:3 &s_rrr_shi %s rn=%reg_0 + +MOV_rxri 000 00 ..... ... ... @shift_i shty=0 # LSL +MOV_rxri 000 01 ..... ... ... @shift_i shty=1 # LSR +MOV_rxri 000 10 ..... ... ... @shift_i shty=2 # ASR + +# Add/subtract (three low registers) + +@addsub_3 ....... rm:3 rn:3 rd:3 \ + &s_rrr_shi %s shim=0 shty=0 + +ADD_rrri 0001100 ... ... ... @addsub_3 +SUB_rrri 0001101 ... ... ... @addsub_3 + +# Add/subtract (two low registers and immediate) + +@addsub_2i ....... imm:3 rn:3 rd:3 \ + &s_rri_rot %s rot=0 + +ADD_rri 0001 110 ... ... ... @addsub_2i +SUB_rri 0001 111 ... ... ... @addsub_2i + +# Add, subtract, compare, move (one low register and immediate) + +%reg_8 8:3 +@arith_1i ..... rd:3 imm:8 \ + &s_rri_rot rot=0 rn=%reg_8 + +MOV_rxi 00100 ... ........ @arith_1i %s +CMP_xri 00101 ... ........ @arith_1i s=1 +ADD_rri 00110 ... ........ @arith_1i %s +SUB_rri 00111 ... ........ @arith_1i %s + +# Add, compare, move (two high registers) + +%reg_0_7 7:1 0:3 +@addsub_2h .... .... . rm:4 ... \ + &s_rrr_shi rd=%reg_0_7 rn=%reg_0_7 shim=0 shty=0 + +ADD_rrri 0100 0100 . .... ... @addsub_2h s=0 +CMP_xrri 0100 0101 . .... ... @addsub_2h s=1 +MOV_rxri 0100 0110 . .... ... @addsub_2h s=0 + +# Adjust SP (immediate) + +%imm7_0x4 0:7 !function=times_4 +@addsub_sp_i .... .... . ....... \ + &s_rri_rot s=0 rd=13 rn=13 rot=0 imm=%imm7_0x4 + +ADD_rri 1011 0000 0 ....... @addsub_sp_i +SUB_rri 1011 0000 1 ....... @addsub_sp_i + +# Branch and exchange + +@branchr .... .... . rm:4 ... &r + +BX 0100 0111 0 .... 000 @branchr +BLX_r 0100 0111 1 .... 000 @branchr +BXNS 0100 0111 0 .... 100 @branchr +BLXNS 0100 0111 1 .... 100 @branchr + +# Extend + +@extend .... .... .. rm:3 rd:3 &rrr_rot rn=15 rot=0 + +SXTAH 1011 0010 00 ... ... @extend +SXTAB 1011 0010 01 ... ... @extend +UXTAH 1011 0010 10 ... ... @extend +UXTAB 1011 0010 11 ... ... @extend + +# Change processor state + +%imod 4:1 !function=plus_2 + +SETEND 1011 0110 010 1 E:1 000 &setend +{ + CPS 1011 0110 011 . 0 A:1 I:1 F:1 &cps mode=0 M=0 %imod + CPS_v7m 1011 0110 011 im:1 00 I:1 F:1 +} + +# Reverse bytes + +@rdm .... .... .. rm:3 rd:3 &rr + +REV 1011 1010 00 ... ... @rdm +REV16 1011 1010 01 ... ... @rdm +REVSH 1011 1010 11 ... ... @rdm + +# Hints + +{ + { + YIELD 1011 1111 0001 0000 + WFE 1011 1111 0010 0000 + WFI 1011 1111 0011 0000 + + # TODO: Implement SEV, SEVL; may help SMP performance. + # SEV 1011 1111 0100 0000 + # SEVL 1011 1111 0101 0000 + + # The canonical nop has the second nibble as 0000, but the whole of the + # rest of the space is a reserved hint, behaves as nop. + NOP 1011 1111 ---- 0000 + } + IT 1011 1111 cond_mask:8 +} + +# Miscellaneous 16-bit instructions + +%imm6_9_3 9:1 3:5 !function=times_2 + +HLT 1011 1010 10 imm:6 &i +BKPT 1011 1110 imm:8 &i +CBZ 1011 nz:1 0.1 ..... rn:3 imm=%imm6_9_3 + +# Push and Pop + +%push_list 0:9 !function=t16_push_list +%pop_list 0:9 !function=t16_pop_list + +STM 1011 010 ......... \ + &ldst_block i=0 b=1 u=0 w=1 rn=13 list=%push_list +LDM_t16 1011 110 ......... \ + &ldst_block i=1 b=0 u=0 w=1 rn=13 list=%pop_list + +# Conditional branches, Supervisor call + +%imm8_0x2 0:s8 !function=times_2 + +{ + UDF 1101 1110 ---- ---- + SVC 1101 1111 imm:8 &i + B_cond_thumb 1101 cond:4 ........ &ci imm=%imm8_0x2 +} + +# Unconditional Branch + +%imm11_0x2 0:s11 !function=times_2 + +B 11100 ........... &i imm=%imm11_0x2 + +# thumb_insn_is_16bit() ensures we won't be decoding these as +# T16 instructions for a Thumb2 CPU, so these patterns must be +# a Thumb1 split BL/BLX. +BLX_suffix 11101 imm:11 &i +BL_BLX_prefix 11110 imm:s11 &i +BL_suffix 11111 imm:11 &i |