qemu/target/riscv/insn16.decode

#
# RISC-V translation routines for the RVXI Base Integer Instruction Set.
#
# Copyright (c) 2018 Peer Adelt, peer.adelt@hni.uni-paderborn.de
#                    Bastian Koppelmann, kbastian@mail.uni-paderborn.de
#
# This program is free software; you can redistribute it and/or modify it
# under the terms and conditions of the GNU General Public License,
# version 2 or later, as published by the Free Software Foundation.
#
# This program is distributed in the hope it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along with
# this program.  If not, see <http://www.gnu.org/licenses/>.

# Fields:
%rd        7:5
%rs1_3     7:3                !function=ex_rvc_register
%rs2_3     2:3                !function=ex_rvc_register
%rs2_5     2:5

# Immediates:
%imm_ci        12:s1 2:5
%nzuimm_ciw    7:4 11:2 5:1 6:1   !function=ex_shift_2
%uimm_cl_d     5:2 10:3           !function=ex_shift_3
%uimm_cl_w     5:1 10:3 6:1       !function=ex_shift_2
%imm_cb        12:s1 5:2 2:1 10:2 3:2 !function=ex_shift_1
%imm_cj        12:s1 8:1 9:2 6:1 7:1 2:1 11:1 3:3 !function=ex_shift_1

%nzuimm_6bit   12:1 2:5
%uimm_6bit_ld 2:3 12:1 5:2           !function=ex_shift_3
%uimm_6bit_lw 2:2 12:1 4:3           !function=ex_shift_2
%uimm_6bit_sd 7:3 10:3               !function=ex_shift_3
%uimm_6bit_sw 7:2 9:4                !function=ex_shift_2

%imm_addi16sp  12:s1 3:2 5:1 2:1 6:1 !function=ex_shift_4
%imm_lui       12:s1 2:5             !function=ex_shift_12



# Argument sets:
&cl               rs1 rd
&cl_dw     uimm   rs1 rd
&ci        imm        rd
&ciw       nzuimm     rd
&cs               rs1 rs2
&cs_dw     uimm   rs1 rs2
&cb        imm    rs1
&cr               rd  rs2
&cj       imm
&c_shift   shamt      rd

&c_ld      uimm  rd
&c_sd      uimm  rs2

&caddi16sp_lui  imm_lui imm_addi16sp rd
&cflwsp_ldsp    uimm_flwsp uimm_ldsp rd
&cfswsp_sdsp    uimm_fswsp uimm_sdsp rs2

# Formats 16:
@cr        ....  ..... .....  .. &cr                      rs2=%rs2_5  %rd
@ci        ... . ..... .....  .. &ci     imm=%imm_ci                  %rd
@ciw       ...   ........ ... .. &ciw    nzuimm=%nzuimm_ciw           rd=%rs2_3
@cl_d      ... ... ... .. ... .. &cl_dw  uimm=%uimm_cl_d  rs1=%rs1_3  rd=%rs2_3
@cl_w      ... ... ... .. ... .. &cl_dw  uimm=%uimm_cl_w  rs1=%rs1_3  rd=%rs2_3
@cl        ... ... ... .. ... .. &cl                      rs1=%rs1_3  rd=%rs2_3
@cs        ... ... ... .. ... .. &cs                      rs1=%rs1_3  rs2=%rs2_3
@cs_2      ... ... ... .. ... .. &cr                      rd=%rs1_3   rs2=%rs2_3
@cs_d      ... ... ... .. ... .. &cs_dw  uimm=%uimm_cl_d  rs1=%rs1_3  rs2=%rs2_3
@cs_w      ... ... ... .. ... .. &cs_dw  uimm=%uimm_cl_w  rs1=%rs1_3  rs2=%rs2_3
@cb        ... ... ... .. ... .. &cb     imm=%imm_cb      rs1=%rs1_3
@cj        ...    ........... .. &cj     imm=%imm_cj

@c_ld      ... . .....  ..... .. &c_ld     uimm=%uimm_6bit_ld  %rd
@c_lw      ... . .....  ..... .. &c_ld     uimm=%uimm_6bit_lw  %rd
@c_sd      ... . .....  ..... .. &c_sd     uimm=%uimm_6bit_sd  rs2=%rs2_5
@c_sw      ... . .....  ..... .. &c_sd     uimm=%uimm_6bit_sw  rs2=%rs2_5

@c_addi16sp_lui ... .  ..... ..... .. &caddi16sp_lui %imm_lui %imm_addi16sp %rd
@c_flwsp_ldsp   ... .  ..... ..... .. &cflwsp_ldsp uimm_flwsp=%uimm_6bit_lw \
    uimm_ldsp=%uimm_6bit_ld %rd
@c_fswsp_sdsp   ... .  ..... ..... .. &cfswsp_sdsp uimm_fswsp=%uimm_6bit_sw \
    uimm_sdsp=%uimm_6bit_sd rs2=%rs2_5

@c_shift        ... . .. ... ..... .. &c_shift rd=%rs1_3 shamt=%nzuimm_6bit
@c_shift2       ... . .. ... ..... .. &c_shift rd=%rd    shamt=%nzuimm_6bit

@c_andi         ... . .. ... ..... .. &ci imm=%imm_ci rd=%rs1_3

# *** RV64C Standard Extension (Quadrant 0) ***
c_addi4spn        000    ........ ... 00 @ciw
c_fld             001  ... ... .. ... 00 @cl_d
c_lw              010  ... ... .. ... 00 @cl_w
c_flw_ld          011  --- ... -- ... 00 @cl    #Note: Must parse uimm manually
c_fsd             101  ... ... .. ... 00 @cs_d
c_sw              110  ... ... .. ... 00 @cs_w
c_fsw_sd          111  --- ... -- ... 00 @cs    #Note: Must parse uimm manually

# *** RV64C Standard Extension (Quadrant 1) ***
c_addi            000 .  .....  ..... 01 @ci
c_jal_addiw       001 .  .....  ..... 01 @ci #Note: parse rd and/or imm manually
c_li              010 .  .....  ..... 01 @ci
c_addi16sp_lui    011 .  .....  ..... 01 @c_addi16sp_lui # shares opc with C.LUI
c_srli            100 . 00 ...  ..... 01 @c_shift
c_srai            100 . 01 ...  ..... 01 @c_shift
c_andi            100 . 10 ...  ..... 01 @c_andi
c_sub             100 0 11 ... 00 ... 01 @cs_2
c_xor             100 0 11 ... 01 ... 01 @cs_2
c_or              100 0 11 ... 10 ... 01 @cs_2
c_and             100 0 11 ... 11 ... 01 @cs_2
c_subw            100 1 11 ... 00 ... 01 @cs_2
c_addw            100 1 11 ... 01 ... 01 @cs_2
c_j               101     ........... 01 @cj
c_beqz            110  ... ...  ..... 01 @cb
c_bnez            111  ... ...  ..... 01 @cb

# *** RV64C Standard Extension (Quadrant 2) ***
c_slli            000 .  .....  ..... 10 @c_shift2
c_fldsp           001 .  .....  ..... 10 @c_ld
c_lwsp            010 .  .....  ..... 10 @c_lw
c_flwsp_ldsp      011 .  .....  ..... 10 @c_flwsp_ldsp #C.LDSP:RV64;C.FLWSP:RV32
c_jr_mv           100 0  .....  ..... 10 @cr
c_ebreak_jalr_add 100 1  .....  ..... 10 @cr
c_fsdsp           101   ......  ..... 10 @c_sd
c_swsp            110 .  .....  ..... 10 @c_sw
c_fswsp_sdsp      111 .  .....  ..... 10 @c_fswsp_sdsp #C.SDSP:RV64;C.FSWSP:RV32