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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 LDREX
@id 70
@desc {
Load Register Exclusive calculates an address from a base register value and an immediate offset, loads a word from memory, writes it to a register and: • if the address has the Shared Memory attribute, marks the physical address as exclusive access for the executing processor in a global monitor • causes the executing processor to indicate an active exclusive access in the local monitor. For more information about support for shared memory see Synchronization and semaphores on page A3-114. For information about memory accesses see Memory accesses on page A8-294.
}
@encoding (T1) {
@word 1 1 1 0 1 0 0 0 0 1 0 1 Rn(4) Rt(4) 1 1 1 1 imm8(8)
@syntax {
@subid 216
@conv {
reg_T = Register(Rt)
reg_N = Register(Rn)
imm32 = ZeroExtend(imm8:'00', 32)
maccess = MemAccessOffset(reg_N, imm32)
}
@asm ldrex reg_T maccess
}
}
@encoding (A1) {
@word cond(4) 0 0 0 1 1 0 0 1 Rn(4) Rt(4) 1 1 1 1 1 0 0 1 1 1 1 1
@syntax {
@subid 217
@conv {
reg_T = Register(Rt)
reg_N = Register(Rn)
imm32 = Zeros(32)
maccess = MemAccessOffset(reg_N, imm32)
}
@asm ldrex reg_T maccess
@rules {
check g_arm_instruction_set_cond(cond)
}
}
}
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