43 lines
1.9 KiB
Plaintext
43 lines
1.9 KiB
Plaintext
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# M-profile UserFault.NOCP exception handling
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#
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# Copyright (c) 2020 Linaro, Ltd
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, see <http://www.gnu.org/licenses/>.
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#
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# This file is processed by scripts/decodetree.py
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#
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# For M-profile, the architecture specifies that NOCP UsageFaults
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# should take precedence over UNDEF faults over the whole wide
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# range of coprocessor-space encodings, with the exception of
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# VLLDM and VLSTM. (Compare v8.1M IsCPInstruction() pseudocode and
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# v8M Arm ARM rule R_QLGM.) This isn't mandatory for v8.0M but we choose
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# to behave the same as v8.1M.
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# This decode is handled before any others (and in particular before
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# decoding FP instructions which are in the coprocessor space).
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# If the coprocessor is not present or disabled then we will generate
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# the NOCP exception; otherwise we let the insn through to the main decode.
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{
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# Special cases which do not take an early NOCP: VLLDM and VLSTM
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VLLDM_VLSTM 1110 1100 001 l:1 rn:4 0000 1010 0000 0000
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# TODO: VSCCLRM (new in v8.1M) is similar:
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#VSCCLRM 1110 1100 1-01 1111 ---- 1011 ---- ---0
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NOCP 111- 1110 ---- ---- ---- cp:4 ---- ----
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NOCP 111- 110- ---- ---- ---- cp:4 ---- ----
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# TODO: From v8.1M onwards we will also want this range to NOCP
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#NOCP_8_1 111- 1111 ---- ---- ---- ---- ---- ---- cp=10
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}
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