Subversion Repositories s80186

// Copyright Jamie Iles, 2017

//

// This file is part of s80x86.

//

// s80x86 is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// s80x86 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 General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with s80x86.  If not, see .

// BOUND

.at 0x62;

    modrm_start, mar_write, mar_wr_sel EA, segment DS,

        jmp_rm_reg_mem bound_reg;

.auto_address;

bound_reg:

    b_sel IMMEDIATE, immediate 0x18, alu_op SELB, tmp_wr_en, jmp do_int;

bound_mem:

    alu_op GETFLAGS, tmp_wr_en, segment DS, mem_read;

    a_sel MDR, b_sel RB, alu_op BOUNDL, update_flags CF;

    a_sel MAR, b_sel IMMEDIATE, immediate 0x2, alu_op ADD, mar_write,

        mar_wr_sel Q, segment DS, jmp_if_taken bound_fail;

    segment DS, mem_read;

    a_sel MDR, b_sel RB, alu_op BOUNDH, update_flags CF;

    jmp_if_taken bound_fail;

    b_sel TEMP, alu_op SELB, alu_op SETFLAGSB, update_flags CF, next_instruction;

bound_fail:

    b_sel TEMP, alu_op SELB, alu_op SETFLAGSB, update_flags CF;

    b_sel IMMEDIATE, immediate 0x14, alu_op SELB, tmp_wr_en, jmp do_int;