67b54c554b
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20190904193059.26202-68-richard.henderson@linaro.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
282 lines
9.4 KiB
Plaintext
282 lines
9.4 KiB
Plaintext
# Thumb1 instructions
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#
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# Copyright (c) 2019 Linaro, Ltd
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, see <http://www.gnu.org/licenses/>.
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#
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# This file is processed by scripts/decodetree.py
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#
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&empty !extern
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&s_rrr_shi !extern s rd rn rm shim shty
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&s_rrr_shr !extern s rn rd rm rs shty
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&s_rri_rot !extern s rn rd imm rot
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&s_rrrr !extern s rd rn rm ra
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&rrr_rot !extern rd rn rm rot
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&rr !extern rd rm
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&ri !extern rd imm
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&r !extern rm
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&i !extern imm
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&ldst_rr !extern p w u rn rt rm shimm shtype
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&ldst_ri !extern p w u rn rt imm
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&ldst_block !extern rn i b u w list
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&setend !extern E
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&cps !extern mode imod M A I F
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&ci !extern cond imm
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# Set S if the instruction is outside of an IT block.
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%s !function=t16_setflags
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# Data-processing (two low registers)
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%reg_0 0:3
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@lll_noshr ...... .... rm:3 rd:3 \
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&s_rrr_shi %s rn=%reg_0 shim=0 shty=0
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@xll_noshr ...... .... rm:3 rn:3 \
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&s_rrr_shi s=1 rd=0 shim=0 shty=0
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@lxl_shr ...... .... rs:3 rd:3 \
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&s_rrr_shr %s rm=%reg_0 rn=0
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AND_rrri 010000 0000 ... ... @lll_noshr
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EOR_rrri 010000 0001 ... ... @lll_noshr
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MOV_rxrr 010000 0010 ... ... @lxl_shr shty=0 # LSL
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MOV_rxrr 010000 0011 ... ... @lxl_shr shty=1 # LSR
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MOV_rxrr 010000 0100 ... ... @lxl_shr shty=2 # ASR
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ADC_rrri 010000 0101 ... ... @lll_noshr
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SBC_rrri 010000 0110 ... ... @lll_noshr
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MOV_rxrr 010000 0111 ... ... @lxl_shr shty=3 # ROR
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TST_xrri 010000 1000 ... ... @xll_noshr
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RSB_rri 010000 1001 rn:3 rd:3 &s_rri_rot %s imm=0 rot=0
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CMP_xrri 010000 1010 ... ... @xll_noshr
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CMN_xrri 010000 1011 ... ... @xll_noshr
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ORR_rrri 010000 1100 ... ... @lll_noshr
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MUL 010000 1101 rn:3 rd:3 &s_rrrr %s rm=%reg_0 ra=0
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BIC_rrri 010000 1110 ... ... @lll_noshr
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MVN_rxri 010000 1111 ... ... @lll_noshr
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# Load/store (register offset)
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@ldst_rr ....... rm:3 rn:3 rt:3 \
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&ldst_rr p=1 w=0 u=1 shimm=0 shtype=0
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STR_rr 0101 000 ... ... ... @ldst_rr
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STRH_rr 0101 001 ... ... ... @ldst_rr
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STRB_rr 0101 010 ... ... ... @ldst_rr
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LDRSB_rr 0101 011 ... ... ... @ldst_rr
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LDR_rr 0101 100 ... ... ... @ldst_rr
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LDRH_rr 0101 101 ... ... ... @ldst_rr
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LDRB_rr 0101 110 ... ... ... @ldst_rr
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LDRSH_rr 0101 111 ... ... ... @ldst_rr
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# Load/store word/byte (immediate offset)
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%imm5_6x4 6:5 !function=times_4
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@ldst_ri_1 ..... imm:5 rn:3 rt:3 \
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&ldst_ri p=1 w=0 u=1
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@ldst_ri_4 ..... ..... rn:3 rt:3 \
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&ldst_ri p=1 w=0 u=1 imm=%imm5_6x4
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STR_ri 01100 ..... ... ... @ldst_ri_4
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LDR_ri 01101 ..... ... ... @ldst_ri_4
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STRB_ri 01110 ..... ... ... @ldst_ri_1
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LDRB_ri 01111 ..... ... ... @ldst_ri_1
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# Load/store halfword (immediate offset)
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%imm5_6x2 6:5 !function=times_2
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@ldst_ri_2 ..... ..... rn:3 rt:3 \
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&ldst_ri p=1 w=0 u=1 imm=%imm5_6x2
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STRH_ri 10000 ..... ... ... @ldst_ri_2
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LDRH_ri 10001 ..... ... ... @ldst_ri_2
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# Load/store (SP-relative)
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%imm8_0x4 0:8 !function=times_4
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@ldst_spec_i ..... rt:3 ........ \
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&ldst_ri p=1 w=0 u=1 imm=%imm8_0x4
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STR_ri 10010 ... ........ @ldst_spec_i rn=13
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LDR_ri 10011 ... ........ @ldst_spec_i rn=13
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# Load (PC-relative)
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LDR_ri 01001 ... ........ @ldst_spec_i rn=15
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# Add PC/SP (immediate)
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ADR 10100 rd:3 ........ imm=%imm8_0x4
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ADD_rri 10101 rd:3 ........ \
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&s_rri_rot rn=13 s=0 rot=0 imm=%imm8_0x4 # SP
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# Load/store multiple
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@ldstm ..... rn:3 list:8 &ldst_block i=1 b=0 u=0 w=1
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STM 11000 ... ........ @ldstm
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LDM_t16 11001 ... ........ @ldstm
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# Shift (immediate)
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@shift_i ..... shim:5 rm:3 rd:3 &s_rrr_shi %s rn=%reg_0
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MOV_rxri 000 00 ..... ... ... @shift_i shty=0 # LSL
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MOV_rxri 000 01 ..... ... ... @shift_i shty=1 # LSR
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MOV_rxri 000 10 ..... ... ... @shift_i shty=2 # ASR
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# Add/subtract (three low registers)
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@addsub_3 ....... rm:3 rn:3 rd:3 \
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&s_rrr_shi %s shim=0 shty=0
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ADD_rrri 0001100 ... ... ... @addsub_3
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SUB_rrri 0001101 ... ... ... @addsub_3
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# Add/subtract (two low registers and immediate)
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@addsub_2i ....... imm:3 rn:3 rd:3 \
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&s_rri_rot %s rot=0
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ADD_rri 0001 110 ... ... ... @addsub_2i
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SUB_rri 0001 111 ... ... ... @addsub_2i
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# Add, subtract, compare, move (one low register and immediate)
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%reg_8 8:3
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@arith_1i ..... rd:3 imm:8 \
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&s_rri_rot rot=0 rn=%reg_8
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MOV_rxi 00100 ... ........ @arith_1i %s
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CMP_xri 00101 ... ........ @arith_1i s=1
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ADD_rri 00110 ... ........ @arith_1i %s
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SUB_rri 00111 ... ........ @arith_1i %s
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# Add, compare, move (two high registers)
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%reg_0_7 7:1 0:3
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@addsub_2h .... .... . rm:4 ... \
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&s_rrr_shi rd=%reg_0_7 rn=%reg_0_7 shim=0 shty=0
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ADD_rrri 0100 0100 . .... ... @addsub_2h s=0
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CMP_xrri 0100 0101 . .... ... @addsub_2h s=1
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MOV_rxri 0100 0110 . .... ... @addsub_2h s=0
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# Adjust SP (immediate)
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%imm7_0x4 0:7 !function=times_4
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@addsub_sp_i .... .... . ....... \
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&s_rri_rot s=0 rd=13 rn=13 rot=0 imm=%imm7_0x4
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ADD_rri 1011 0000 0 ....... @addsub_sp_i
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SUB_rri 1011 0000 1 ....... @addsub_sp_i
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# Branch and exchange
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@branchr .... .... . rm:4 ... &r
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BX 0100 0111 0 .... 000 @branchr
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BLX_r 0100 0111 1 .... 000 @branchr
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BXNS 0100 0111 0 .... 100 @branchr
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BLXNS 0100 0111 1 .... 100 @branchr
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# Extend
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@extend .... .... .. rm:3 rd:3 &rrr_rot rn=15 rot=0
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SXTAH 1011 0010 00 ... ... @extend
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SXTAB 1011 0010 01 ... ... @extend
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UXTAH 1011 0010 10 ... ... @extend
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UXTAB 1011 0010 11 ... ... @extend
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# Change processor state
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%imod 4:1 !function=plus_2
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SETEND 1011 0110 010 1 E:1 000 &setend
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{
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CPS 1011 0110 011 . 0 A:1 I:1 F:1 &cps mode=0 M=0 %imod
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CPS_v7m 1011 0110 011 im:1 00 I:1 F:1
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}
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# Reverse bytes
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@rdm .... .... .. rm:3 rd:3 &rr
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REV 1011 1010 00 ... ... @rdm
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REV16 1011 1010 01 ... ... @rdm
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REVSH 1011 1010 11 ... ... @rdm
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# Hints
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{
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{
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YIELD 1011 1111 0001 0000
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WFE 1011 1111 0010 0000
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WFI 1011 1111 0011 0000
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# TODO: Implement SEV, SEVL; may help SMP performance.
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# SEV 1011 1111 0100 0000
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# SEVL 1011 1111 0101 0000
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# The canonical nop has the second nibble as 0000, but the whole of the
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# rest of the space is a reserved hint, behaves as nop.
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NOP 1011 1111 ---- 0000
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}
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IT 1011 1111 cond_mask:8
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}
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# Miscellaneous 16-bit instructions
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%imm6_9_3 9:1 3:5 !function=times_2
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HLT 1011 1010 10 imm:6 &i
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BKPT 1011 1110 imm:8 &i
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CBZ 1011 nz:1 0.1 ..... rn:3 imm=%imm6_9_3
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# Push and Pop
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%push_list 0:9 !function=t16_push_list
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%pop_list 0:9 !function=t16_pop_list
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STM 1011 010 ......... \
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&ldst_block i=0 b=1 u=0 w=1 rn=13 list=%push_list
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LDM_t16 1011 110 ......... \
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&ldst_block i=1 b=0 u=0 w=1 rn=13 list=%pop_list
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# Conditional branches, Supervisor call
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%imm8_0x2 0:s8 !function=times_2
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{
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UDF 1101 1110 ---- ----
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SVC 1101 1111 imm:8 &i
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B_cond_thumb 1101 cond:4 ........ &ci imm=%imm8_0x2
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}
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# Unconditional Branch
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%imm11_0x2 0:s11 !function=times_2
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B 11100 ........... &i imm=%imm11_0x2
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# thumb_insn_is_16bit() ensures we won't be decoding these as
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# T16 instructions for a Thumb2 CPU, so these patterns must be
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# a Thumb1 split BL/BLX.
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BLX_suffix 11101 imm:11 &i
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BL_BLX_prefix 11110 imm:s11 &i
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BL_suffix 11111 imm:11 &i
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