/* Chrysalide - Outil d'analyse de fichiers binaires
 * ##FILE## - traduction d'instructions ARMv7
 *
 * Copyright (C) 2014 Cyrille Bagard
 *
 *  This file is part of Chrysalide.
 *
 *  Chrysalide 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.
 *
 *  Chrysalide 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 Foobar.  If not, see <http://www.gnu.org/licenses/>.
 */


@title LDRB (immediate, Thumb)

@encoding(t1) {

    @half 0 1 1 1 1 imm5(5) Rn(3) Rt(3)

    @syntax <Rgt>, <access>

    @conv {

        Rgt = Register(Rt)
        Rgn = Register(Rn)
        imm32 = ZeroExtend(imm5, 5, 32)
        access = MakeMemoryAccess(Rgn, imm32, 1, 0)

    }

}

@encoding(T2) {

    @word 1 1 1 1 1 0 0 0 1 0 0 1 Rn(4) Rt(4) imm12(12)

    @syntax "ldrb.W" <Rgt>, <access>

    @conv {

        Rgt = Register(Rt)
        Rgn = Register(Rn)
        imm32 = ZeroExtend(imm12, 12, 32)
        access = MakeMemoryAccess(Rgn, imm32, 1, 0)

    }

    @rules {

        //if Rt == '1111' then SEE PLD;
        //if Rn == '1111' then SEE LDRB (literal);
        //if t == 13 then UNPREDICTABLE;
        if (Rt == '1111'); call DefineAsReturn(1)

    }

}

@encoding(T31) {

    @word 1 1 1 1 1 0 0 0 0 0 0 1 Rn(4) Rt(4) 1 1 U(1) W(1) imm8(8)

    @syntax <Rgt> <access>

    @conv {

        Rgt = Register(Rt)
        Rgn = Register(Rn)
        imm32 = ZeroExtend(imm8, 8, 32);
        access = MakeMemoryAccess(Rgn, imm32, U, W)

    }

    @rules {

        //if Rt == '1111' && P == '1' && U == '0' && W == '0' then SEE PLD, PLDW (immediate);
        //if Rn == '1111' then SEE LDRB (literal);
        //if P == '1' && U == '1' && W == '0' then SEE LDRBT;
        //if P == '0' && W == '0' then UNDEFINED;
        //if t == 13 || (t == 15 && W == '1') || (wback && n == t) then UNPREDICTABLE;
        if (Rt == '1111'); call DefineAsReturn(1)

    }

}

@encoding(T32) {

    @word 1 1 1 1 1 0 0 0 0 0 0 1 Rn(4) Rt(4) 1 0 U(1) W(1) imm8(8)

    @syntax <Rgt> <base> <offset>

    @conv {

        Rgt = Register(Rt)
        Rgn = Register(Rn)
        imm32 = ZeroExtend(imm8, 8, 32);
        base = MakeMemoryNotIndexed(Rgn, W)
        offset = MakeAccessOffset(U, imm32)

    }

    @rules {

        //if Rt == '1111' && P == '1' && U == '0' && W == '0' then SEE PLD, PLDW (immediate);
        //if Rn == '1111' then SEE LDRB (literal);
        //if P == '1' && U == '1' && W == '0' then SEE LDRBT;
        //if P == '0' && W == '0' then UNDEFINED;
        //if t == 13 || (t == 15 && W == '1') || (wback && n == t) then UNPREDICTABLE;
        if (Rt == '1111'); call DefineAsReturn(1)

    }

}