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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 LDRSB (register)
@id 85
@desc {
Load Register Signed Byte (register) calculates an address from a base register value and an offset register value, loads a byte from memory, sign-extends it to form a 32-bit word, and writes it to a register. The offset register value can be shifted left by 0, 1, 2, or 3 bits. For information about memory accesses see Memory accesses on page A8-294.
}
@encoding (t1) {
@half 0 1 0 1 0 1 1 Rm(3) Rn(3) Rt(3)
@syntax {
@subid 249
@conv {
reg_T = Register(Rt)
reg_N = Register(Rn)
reg_M = Register(Rm)
maccess = MemAccessOffset(reg_N, reg_M)
}
@asm ldrsb reg_T maccess
}
}
@encoding (T2) {
@word 1 1 1 1 1 0 0 1 0 0 0 1 Rn(4) Rt(4) 0 0 0 0 0 0 imm2(2) Rm(4)
@syntax {
@subid 250
@conv {
reg_T = Register(Rt)
reg_N = Register(Rn)
reg_M = Register(Rm)
shift = FixedShift(SRType_LSL, imm2)
maccess = MemAccessOffsetExtended(reg_N, reg_M, shift)
}
@asm ldrsb.w reg_T maccess
}
}
@encoding (A1) {
@word cond(4) 0 0 0 P(1) U(1) 0 W(1) 1 Rn(4) Rt(4) 0 0 0 0 1 1 0 1 Rm(4)
@syntax {
@subid 251
@assert {
P == 1
P == 1 && W == 0
}
@conv {
reg_T = Register(Rt)
reg_N = Register(Rn)
reg_M = Register(Rm)
maccess = MemAccessOffset(reg_N, reg_M)
}
@asm ldrsb reg_T maccess
@rules {
check g_arm_instruction_set_cond(cond)
}
}
@syntax {
@subid 252
@assert {
P == 1
P == 0 || W == 1
}
@conv {
reg_T = Register(Rt)
reg_N = Register(Rn)
reg_M = Register(Rm)
maccess = MemAccessPreIndexed(reg_N, reg_M)
}
@asm ldrsb reg_T maccess
@rules {
check g_arm_instruction_set_cond(cond)
}
}
@syntax {
@subid 253
@assert {
P == 0
P == 0 || W == 1
}
@conv {
reg_T = Register(Rt)
reg_N = Register(Rn)
reg_M = Register(Rm)
maccess = MemAccessPostIndexed(reg_N, reg_M)
}
@asm ldrsb reg_T maccess
@rules {
check g_arm_instruction_set_cond(cond)
}
}
}
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