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d93979b7
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Arnaud Dieumegard
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-- Copyright (C) 1996 Morgan Kaufmann Publishers, Inc
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-- This file is part of VESTs (Vhdl tESTs).
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-- VESTs is free software; you can redistribute it and/or modify it
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-- under the terms of the GNU General Public License as published by the
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-- Free Software Foundation; either version 2 of the License, or (at
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-- your option) any later version.
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-- VESTs is distributed in the hope that it will be useful, but WITHOUT
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-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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-- for more details.
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-- You should have received a copy of the GNU General Public License
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-- along with VESTs; if not, write to the Free Software Foundation,
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-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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-- ---------------------------------------------------------------------
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--
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-- $Id: ch_15_dlxi-b.vhd,v 1.3 2001-10-26 16:29:35 paw Exp $
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-- $Revision: 1.3 $
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--
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-- ---------------------------------------------------------------------
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library bv_utilities;
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package body dlx_instr is
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use bv_utilities.bv_arithmetic.all;
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constant opcode_names : opcode_name_array
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:= ( "SPECIAL ", "FPARITH ", "J ", "JAL ",
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"BEQZ ", "BNEZ ", "BFPT ", "BFPF ",
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"ADDI ", "ADDUI ", "SUBI ", "SUBUI ",
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"ANDI ", "ORI ", "XORI ", "LHI ",
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"RFE ", "TRAP ", "JR ", "JALR ",
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"SLLI ", "UNDEF_15", "SRLI ", "SRAI ",
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"SEQI ", "SNEI ", "SLTI ", "SGTI ",
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"SLEI ", "SGEI ", "UNDEF_1E", "UNDEF_1F",
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"LB ", "LH ", "UNDEF_22", "LW ",
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"LBU ", "LHU ", "LF ", "LD ",
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"SB ", "SH ", "UNDEF_2A", "SW ",
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"UNDEF_2C", "UNDEF_2D", "SF ", "SD ",
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"SEQUI ", "SNEUI ", "SLTUI ", "SGTUI ",
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"SLEUI ", "SGEUI ", "UNDEF_36", "UNDEF_37",
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"UNDEF_38", "UNDEF_39", "UNDEF_3A", "UNDEF_3B",
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"UNDEF_3C", "UNDEF_3D", "UNDEF_3E", "UNDEF_3F" );
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constant sp_func_names : sp_func_name_array
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:= ( "NOP ", "UNDEF_01", "UNDEF_02", "UNDEF_03",
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"SLL ", "UNDEF_05", "SRL ", "SRA ",
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"UNDEF_08", "UNDEF_09", "UNDEF_0A", "UNDEF_0B",
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"UNDEF_0C", "UNDEF_0D", "UNDEF_0E", "UNDEF_0F",
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"SEQU ", "SNEU ", "SLTU ", "SGTU ",
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"SLEU ", "SGEU ", "UNDEF_16", "UNDEF_17",
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"UNDEF_18", "UNDEF_19", "UNDEF_1A", "UNDEF_1B",
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"UNDEF_1C", "UNDEF_1D", "UNDEF_1E", "UNDEF_1F",
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"ADD ", "ADDU ", "SUB ", "SUBU ",
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"AND ", "OR ", "XOR ", "UNDEF_27",
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"SEQ ", "SNE ", "SLT ", "SGT ",
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"SLE ", "SGE ", "UNDEF_2E", "UNDEF_2F",
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"MOVI2S ", "MOVS2I ", "MOVF ", "MOVD ",
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"MOVFP2I ", "MOVI2FP ", "UNDEF_36", "UNDEF_37",
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"UNDEF_38", "UNDEF_39", "UNDEF_3A", "UNDEF_3B",
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"UNDEF_3C", "UNDEF_3D", "UNDEF_3E", "UNDEF_3F" );
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constant fp_func_names : fp_func_name_array
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:= ( "ADDF ", "SUBF ", "MULTF ", "DIVF ",
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"ADDD ", "SUBD ", "MULTD ", "DIVD ",
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"CVTF2D ", "CVTF2I ", "CVTD2F ", "CVTD2I ",
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"CVTI2F ", "CVTI2D ", "MULT ", "DIV ",
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"EQF ", "NEF ", "LTF ", "GTF ",
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"LEF ", "GEF ", "MULTU ", "DIVU ",
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"EQD ", "NED ", "LTD ", "GTD ",
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"LED ", "GED ", "UNDEF_1E", "UNDEF_1F" );
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procedure disassemble ( instr : dlx_bv_word;
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disassembled_instr : out string; len : out positive ) is
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alias norm_disassembled_instr : string(1 to disassembled_instr'length)
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is disassembled_instr;
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alias instr_opcode : dlx_opcode is instr(0 to 5);
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alias instr_sp_func : dlx_sp_func is instr(26 to 31);
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alias instr_fp_func : dlx_fp_func is instr(27 to 31);
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alias instr_rs1 : dlx_reg_addr is instr(6 to 10);
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alias instr_rs2 : dlx_reg_addr is instr(11 to 15);
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alias instr_Itype_rd : dlx_reg_addr is instr(11 to 15);
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alias instr_Rtype_rd : dlx_reg_addr is instr(16 to 20);
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alias instr_immed16 : dlx_immed16 is instr(16 to 31);
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alias instr_immed26 : dlx_immed26 is instr(6 to 31);
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variable instr_opcode_num : dlx_opcode_num;
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variable instr_sp_func_num : dlx_sp_func_num;
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variable instr_fp_func_num : dlx_fp_func_num;
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variable rs1 : reg_index;
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variable rs2 : reg_index;
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variable Itype_rd : reg_index;
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variable Rtype_rd : reg_index;
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variable result : string(1 to 40) -- long enough for longest instruction
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:= (others => ' ');
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variable index : positive range 1 to 41 := 1; -- position for next char in result
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procedure disassemble_reg ( reg : reg_index; reg_prefix : character ) is
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begin
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result(index) := reg_prefix;
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index := index + 1;
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if reg < 10 then
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result(index to index) := integer'image(reg);
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index := index + 1;
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else
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result(index to index + 1) := integer'image(reg);
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index := index + 2;
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end if;
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end procedure disassemble_reg;
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procedure disassemble_special_reg ( reg : reg_index ) is
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begin
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case reg is
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when 0 =>
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result(index to index + 2) := "IAR";
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index := index + 3;
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when 1 =>
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result(index to index + 2) := "FSR";
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index := index + 3;
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when others =>
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disassemble_reg(reg, 'S');
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end case;
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end procedure disassemble_special_reg;
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procedure disassemble_integer ( int : integer ) is
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constant int_image_length : natural := integer'image(int)'length;
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begin
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result(index to index + int_image_length - 1) := integer'image(int);
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index := index + int_image_length;
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end procedure disassemble_integer;
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begin
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instr_opcode_num := bv_to_natural(instr_opcode);
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instr_sp_func_num := bv_to_natural(instr_sp_func);
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instr_fp_func_num := bv_to_natural(instr_fp_func);
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rs1 := bv_to_natural(instr_rs1);
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rs2 := bv_to_natural(instr_rs2);
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Itype_rd := bv_to_natural(instr_Itype_rd);
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Rtype_rd := bv_to_natural(instr_Rtype_rd);
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if (instr_opcode /= op_special) and (instr_opcode /= op_fparith) then
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result(index to index + instr_name'length - 1) := opcode_names(instr_opcode_num);
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index := index + instr_name'length + 1; -- include space after opcode name
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end if;
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case instr_opcode is
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when op_special =>
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result(index to index + instr_name'length - 1) := sp_func_names(instr_sp_func_num);
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index := index + instr_name'length + 1; -- include space after function name
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case instr_sp_func is
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when sp_func_nop =>
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null;
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when sp_func_sll | sp_func_srl | sp_func_sra
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| sp_func_sequ | sp_func_sneu | sp_func_sltu
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| sp_func_sgtu | sp_func_sleu | sp_func_sgeu
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| sp_func_add | sp_func_addu | sp_func_sub | sp_func_subu
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| sp_func_and | sp_func_or | sp_func_xor
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| sp_func_seq | sp_func_sne | sp_func_slt
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| sp_func_sgt | sp_func_sle | sp_func_sge =>
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disassemble_reg(Rtype_rd, 'R');
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result(index) := ',';
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index := index + 2; -- include space after comma
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disassemble_reg(rs1, 'R');
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result(index) := ',';
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index := index + 2; -- include space after comma
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disassemble_reg(rs2, 'R');
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when sp_func_movi2s =>
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disassemble_special_reg(Rtype_rd);
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result(index) := ',';
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index := index + 2; -- include space after comma
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disassemble_reg(rs1, 'R');
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when sp_func_movs2i =>
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disassemble_reg(Rtype_rd, 'R');
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result(index) := ',';
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index := index + 2; -- include space after comma
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disassemble_special_reg(rs1);
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when sp_func_movf | sp_func_movd =>
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disassemble_reg(Rtype_rd, 'F');
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result(index) := ',';
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index := index + 2; -- include space after comma
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disassemble_reg(rs1, 'F');
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when sp_func_movfp2i =>
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disassemble_reg(Rtype_rd, 'R');
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result(index) := ',';
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index := index + 2; -- include space after comma
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disassemble_reg(rs1, 'F');
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when sp_func_movi2fp =>
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disassemble_reg(Rtype_rd, 'F');
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result(index) := ',';
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index := index + 2; -- include space after comma
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disassemble_reg(rs1, 'R');
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when others =>
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null;
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end case;
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when op_fparith =>
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result(index to index + instr_name'length - 1) := fp_func_names(instr_fp_func_num);
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index := index + instr_name'length + 1; -- include space after function name
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case instr_fp_func is
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when fp_func_addf | fp_func_subf | fp_func_multf | fp_func_divf
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| fp_func_addd | fp_func_subd | fp_func_multd | fp_func_divd
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| fp_func_mult | fp_func_div | fp_func_multu | fp_func_divu =>
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disassemble_reg(Rtype_rd, 'F');
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result(index) := ',';
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index := index + 2; -- include space after comma
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disassemble_reg(rs1, 'F');
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result(index) := ',';
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index := index + 2; -- include space after comma
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disassemble_reg(rs2, 'F');
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when fp_func_cvtf2d | fp_func_cvtd2f =>
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disassemble_reg(Rtype_rd, 'F');
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result(index) := ',';
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index := index + 2; -- include space after comma
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disassemble_reg(rs1, 'F');
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when fp_func_cvtf2i | fp_func_cvtd2i =>
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disassemble_reg(Rtype_rd, 'R');
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result(index) := ',';
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index := index + 2; -- include space after comma
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disassemble_reg(rs1, 'F');
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when fp_func_cvti2f | fp_func_cvti2d =>
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disassemble_reg(Rtype_rd, 'F');
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result(index) := ',';
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index := index + 2; -- include space after comma
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disassemble_reg(rs1, 'R');
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when fp_func_eqf | fp_func_nef | fp_func_ltf
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| fp_func_gtf | fp_func_lef | fp_func_gef
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| fp_func_eqd | fp_func_ned | fp_func_ltd
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| fp_func_gtd | fp_func_led | fp_func_ged =>
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disassemble_reg(rs1, 'F');
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result(index) := ',';
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index := index + 2; -- include space after comma
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disassemble_reg(rs2, 'F');
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when others =>
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null;
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end case;
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when op_j | op_jal =>
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disassemble_integer(bv_to_integer(instr_immed26));
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when op_beqz | op_bnez =>
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disassemble_reg(rs1, 'R');
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result(index) := ',';
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index := index + 2; -- include space after comma
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disassemble_integer(bv_to_integer(instr_immed16));
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when op_bfpt | op_bfpf =>
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disassemble_integer(bv_to_integer(instr_immed16));
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when op_slli | op_srli | op_srai =>
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disassemble_reg(Itype_rd, 'R');
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result(index) := ',';
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index := index + 2; -- include space after comma
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disassemble_reg(rs1, 'R');
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result(index) := ',';
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index := index + 2; -- include space after comma
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| 258 |
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disassemble_integer(bv_to_natural(instr_immed16(11 to 15)));
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| 259 |
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when op_addi | op_subi
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| op_seqi | op_snei | op_slti | op_sgti | op_slei | op_sgei =>
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disassemble_reg(Itype_rd, 'R');
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result(index) := ',';
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| 263 |
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index := index + 2; -- include space after comma
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| 264 |
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disassemble_reg(rs1, 'R');
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result(index) := ',';
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| 266 |
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index := index + 2; -- include space after comma
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disassemble_integer(bv_to_integer(instr_immed16));
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when op_addui | op_subui | op_andi | op_ori | op_xori
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| op_sequi | op_sneui | op_sltui | op_sgtui | op_sleui | op_sgeui =>
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| 270 |
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disassemble_reg(Itype_rd, 'R');
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| 271 |
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result(index) := ',';
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| 272 |
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index := index + 2; -- include space after comma
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| 273 |
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disassemble_reg(rs1, 'R');
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| 274 |
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result(index) := ',';
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| 275 |
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index := index + 2; -- include space after comma
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| 276 |
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disassemble_integer(bv_to_natural(instr_immed16));
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| 277 |
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when op_lhi =>
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disassemble_reg(Itype_rd, 'R');
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result(index) := ',';
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| 280 |
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index := index + 2; -- include space after comma
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| 281 |
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disassemble_integer(bv_to_natural(instr_immed16));
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| 282 |
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when op_rfe =>
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| 283 |
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null;
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| 284 |
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when op_trap =>
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| 285 |
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disassemble_integer(bv_to_natural(instr_immed26));
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| 286 |
|
|
when op_jr | op_jalr =>
|
| 287 |
|
|
disassemble_reg(rs1, 'R');
|
| 288 |
|
|
when op_lb | op_lh | op_lw | op_lbu | op_lhu | op_lf | op_ld =>
|
| 289 |
|
|
disassemble_reg(Itype_rd, 'R');
|
| 290 |
|
|
result(index) := ',';
|
| 291 |
|
|
index := index + 2; -- include space after comma
|
| 292 |
|
|
disassemble_integer(bv_to_integer(instr_immed16));
|
| 293 |
|
|
result(index) := '(';
|
| 294 |
|
|
index := index + 1;
|
| 295 |
|
|
disassemble_reg(rs1, 'R');
|
| 296 |
|
|
result(index) := ')';
|
| 297 |
|
|
index := index + 1;
|
| 298 |
|
|
when op_sb | op_sh | op_sw | op_sf | op_sd =>
|
| 299 |
|
|
disassemble_integer(bv_to_integer(instr_immed16));
|
| 300 |
|
|
result(index) := '(';
|
| 301 |
|
|
index := index + 1;
|
| 302 |
|
|
disassemble_reg(rs1, 'R');
|
| 303 |
|
|
result(index) := ')';
|
| 304 |
|
|
index := index + 1;
|
| 305 |
|
|
result(index) := ',';
|
| 306 |
|
|
index := index + 2; -- include space after comma
|
| 307 |
|
|
disassemble_reg(Itype_rd, 'R');
|
| 308 |
|
|
when others =>
|
| 309 |
|
|
null; -- remaining opcodes have no operands to disassemble
|
| 310 |
|
|
end case;
|
| 311 |
|
|
if index > norm_disassembled_instr'length then
|
| 312 |
|
|
index := norm_disassembled_instr'length; -- limit to out parameter length
|
| 313 |
|
|
else
|
| 314 |
|
|
index := index - 1; -- index points to last result character
|
| 315 |
|
|
end if;
|
| 316 |
|
|
norm_disassembled_instr(1 to index) := result(1 to index);
|
| 317 |
|
|
len := index;
|
| 318 |
|
|
end procedure disassemble;
|
| 319 |
|
|
|
| 320 |
|
|
end package body dlx_instr;
|