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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 IT
@id 53
@desc {
If-Then makes up to four following instructions (the IT block) conditional. The conditions for the instructions in the IT block are the same as, or the inverse of, the condition the IT instruction specifies for the first instruction in the block. The IT instruction itself does not affect the condition flags, but the execution of the instructions in the IT block can change the condition flags. 16-bit instructions in the IT block, other than CMP, CMN and TST, do not set the condition flags. An IT instruction with the AL condition can be used to get this changed behavior without conditional execution. The architecture permits exception return to an instruction in the IT block only if the restoration of the CPSR restores ITSTATE to a state consistent with the conditions specified by the IT instruction. Any other exception return to an instruction in an IT block is UNPREDICTABLE. Any branch to a target instruction in an IT block is not permitted, and if such a branch is made it is UNPREDICTABLE what condition is used when executing that target instruction and any subsequent instruction in the IT block. See also Conditional instructions on page A4-162 and Conditional execution on page A8-288.
}
@encoding (t1) {
@half 1 0 1 1 1 1 1 1 firstcond(4) mask(4)
@syntax {
@subid 138
@conv {
it_cond = ITCond(firstcond, mask)
}
@asm it it_cond
}
@hooks {
fetch = build_it_instruction_suffix
}
}
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