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/* Chrysalide - Outil d'analyse de fichiers binaires
* ##FILE## - traduction d'instructions ARMv7
*
* Copyright (C) 2017 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 Chrysalide. If not, see <http://www.gnu.org/licenses/>.
*/
@title TBB, TBH
@id 231
@desc {
Table Branch Byte causes a PC-relative forward branch using a table of single byte offsets. A base register provides a pointer to the table, and a second register supplies an index into the table. The branch length is twice the value of the byte returned from the table. Table Branch Halfword causes a PC-relative forward branch using a table of single halfword offsets. A base register provides a pointer to the table, and a second register supplies an index into the table. The branch length is twice the value of the halfword returned from the table.
}
@encoding (T1) {
@word 1 1 1 0 1 0 0 0 1 1 0 1 Rn(4) 1 1 1 1 0 0 0 0 0 0 0 H(1) Rm(4)
@syntax {
@subid 721
@assert {
H == 0
}
@conv {
reg_N = Register(Rn)
reg_M = Register(Rm)
maccess = MemAccessOffset(reg_N, reg_M)
}
@asm tbb maccess
}
@syntax {
@subid 722
@assert {
H == 1
}
@conv {
reg_N = Register(Rn)
reg_M = Register(Rm)
fixed_shift = BuildFixedShift(SRType_LSL, 1)
maccess = MemAccessOffsetExtended(reg_N, reg_M, fixed_shift)
}
@asm tbh maccess
}
}
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