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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 ERET
@id 390
@desc {
When executed in Hyp mode, Exception Return loads the PC from ELR_hyp and loads the CPSR from SPSR_hyp. When executed in a Secure or Non-secure PL1 mode, ERET behaves as: MOVS PC, • LR in the ARM instruction set, see SUBS PC, LR and related instructions (ARM) on page B9-2010 • the equivalent SUBS PC, LR, #0 in the Thumb instruction set, see SUBS PC, LR (Thumb) on page B9-2008. ERET is UNPREDICTABLE: • in the cases described in Restrictions on exception return instructions on page B9-1970 • if it is executed in Debug state. Note In an implementation that includes the Virtualization Extensions: • LR, #0 in the Thumb The T1 encoding of ERET is not a new encoding but, is the preferred synonym of SUBS PC, instruction set. See SUBS PC, LR (Thumb) on page B9-2008 for more information. • Because ERET is the preferred encoding, when decoding Thumb instructions, a disassembler will report an ERET where the original assembler code used SUBS PC, LR, #0.
}
@encoding (T1) {
@word 1 1 1 1 0 0 1 1 1 1 0 1 1 1 1 0 1 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0
@syntax {
@subid 3790
@asm eret
}
}
@encoding (A1) {
@word cond(4) 0 0 0 1 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 1 1 1 0
@syntax {
@subid 3791
@asm eret
@rules {
check g_arm_instruction_set_cond(cond)
}
}
}
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