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/* Chrysalide - Outil d'analyse de fichiers binaires
* ##FILE## - traduction d'instructions ARMv7
*
* Copyright (C) 2015 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 BL, BLX (immediate)
@desc Branch with Link calls a subroutine at a PC-relative address. Branch with Link and Exchange Instruction Sets (immediate) calls a subroutine at a PC-relative address, and changes instruction set from ARM to Thumb, or from Thumb to ARM.
@encoding (T1) {
@word 1 1 1 1 0 S(1) imm10(10) 1 1 J1(1) 1 J2(1) imm11(11)
@syntax <imm32>
@conv {
I1 = NOT(J1 EOR S)
I2 = NOT(J2 EOR S)
imm32 = SignExtend(S:I1:I2:imm10:imm11:'0', S & 0x1, 32)
}
@hooks {
fetch = help_fetching_with_instruction_bl_from_thumb
link = handle_call_as_link
post = post_process_branch_and_link_instructions
}
}
@encoding (T2) {
@word 1 1 1 1 0 S(1) imm10H(10) 1 1 J1(1) 0 J2(1) imm10L(10) H(1)
@syntax "blx" <imm32>
@conv {
I1 = NOT(J1 EOR S)
I2 = NOT(J2 EOR S)
imm32 = SignExtend(S:I1:I2:imm10H:imm10L:'00', S & 0x1, 32)
}
@hooks {
fetch = help_fetching_with_instruction_blx_from_thumb
link = handle_call_as_link
post = post_process_branch_and_link_instructions
}
}
@encoding (A1) {
@word cond(4) 1 0 1 1 imm24(24)
@syntax <imm32>
@conv {
imm32 = SignExtend(imm24:'00', imm24 & 0x800000, 32)
}
@rules {
chk_call StoreCondition(cond)
}
@hooks {
fetch = help_fetching_with_instruction_bl_from_arm
link = handle_call_as_link
post = post_process_branch_and_link_instructions
}
}
@encoding (A2) {
@word 1 1 1 1 1 0 1 H(1) imm24(24)
@syntax "blx" <imm32>
@conv {
imm32 = SignExtend(imm24:H:'0', imm24 & 0x800000, 32)
}
@hooks {
fetch = help_fetching_with_instruction_blx_from_arm
link = handle_call_as_link
post = post_process_branch_and_link_instructions
}
}
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