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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 Foobar. If not, see <http://www.gnu.org/licenses/>.
*/
@title LDRH (immediate, Thumb)
@id 78
@desc {
Load Register Halfword (immediate) calculates an address from a base register value and an immediate offset, loads a halfword from memory, zero-extends it to form a 32-bit word, and writes it to a register. It can use offset, post-indexed, or pre-indexed addressing. For information about memory accesses see Memory accesses on page A8-294.
}
@encoding (t1) {
@half 1 0 0 0 1 imm5(5) Rn(3) Rt(3)
@syntax {
@conv {
reg_T = Register(Rt)
reg_N = Register(Rn)
imm32 = ZeroExtend(imm5:'0', 32)
maccess = MemAccessOffset(reg_N, imm32)
}
@asm ldrh reg_T maccess
}
}
@encoding (T2) {
@word 1 1 1 1 1 0 0 0 1 0 1 1 Rn(4) Rt(4) imm12(12)
@syntax {
@conv {
reg_T = Register(Rt)
reg_N = Register(Rn)
imm32 = ZeroExtend(imm12, 32)
maccess = MemAccessOffset(reg_N, imm32)
}
@asm ldrh.w reg_T maccess
}
}
@encoding (T3) {
@word 1 1 1 1 1 0 0 0 0 0 1 1 Rn(4) Rt(4) 1 P(1) U(1) W(1) imm8(8)
@syntax {
@assert {
P == 1
W == 0
}
@conv {
reg_T = Register(Rt)
reg_N = Register(Rn)
imm32 = ZeroExtend(imm8, 32)
maccess = MemAccessOffset(reg_N, imm32)
}
@asm ldrh reg_T maccess
}
@syntax {
@assert {
P == 1
W == 1
}
@conv {
reg_T = Register(Rt)
reg_N = Register(Rn)
imm32 = ZeroExtend(imm8, 32)
maccess = MemAccessPreIndexed(reg_N, imm32)
}
@asm ldrh reg_T maccess
}
@syntax {
@assert {
P == 0
W == 1
}
@conv {
reg_T = Register(Rt)
reg_N = Register(Rn)
imm32 = ZeroExtend(imm8, 32)
maccess = MemAccessPostIndexed(reg_N, imm32)
}
@asm ldrh reg_T maccess
}
}
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