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1 | # M-profile UserFault.NOCP exception handling |
2 | # | |
3 | # Copyright (c) 2020 Linaro, Ltd | |
4 | # | |
5 | # This library is free software; you can redistribute it and/or | |
6 | # modify it under the terms of the GNU Lesser General Public | |
7 | # License as published by the Free Software Foundation; either | |
8 | # version 2.1 of the License, or (at your option) any later version. | |
9 | # | |
10 | # This library is distributed in the hope that it will be useful, | |
11 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | # Lesser General Public License for more details. | |
14 | # | |
15 | # You should have received a copy of the GNU Lesser General Public | |
16 | # License along with this library; if not, see <http://www.gnu.org/licenses/>. | |
17 | ||
18 | # | |
19 | # This file is processed by scripts/decodetree.py | |
20 | # | |
21 | # For M-profile, the architecture specifies that NOCP UsageFaults | |
22 | # should take precedence over UNDEF faults over the whole wide | |
23 | # range of coprocessor-space encodings, with the exception of | |
24 | # VLLDM and VLSTM. (Compare v8.1M IsCPInstruction() pseudocode and | |
25 | # v8M Arm ARM rule R_QLGM.) This isn't mandatory for v8.0M but we choose | |
26 | # to behave the same as v8.1M. | |
27 | # This decode is handled before any others (and in particular before | |
28 | # decoding FP instructions which are in the coprocessor space). | |
29 | # If the coprocessor is not present or disabled then we will generate | |
30 | # the NOCP exception; otherwise we let the insn through to the main decode. | |
31 | ||
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32 | %vd_dp 22:1 12:4 |
33 | %vd_sp 12:4 22:1 | |
34 | ||
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35 | &nocp cp |
36 | ||
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37 | { |
38 | # Special cases which do not take an early NOCP: VLLDM and VLSTM | |
39 | VLLDM_VLSTM 1110 1100 001 l:1 rn:4 0000 1010 0000 0000 | |
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40 | # VSCCLRM (new in v8.1M) is similar: |
41 | VSCCLRM 1110 1100 1.01 1111 .... 1011 imm:7 0 vd=%vd_dp size=3 | |
42 | VSCCLRM 1110 1100 1.01 1111 .... 1010 imm:8 vd=%vd_sp size=2 | |
a3494d46 | 43 | |
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44 | NOCP 111- 1110 ---- ---- ---- cp:4 ---- ---- &nocp |
45 | NOCP 111- 110- ---- ---- ---- cp:4 ---- ---- &nocp | |
46 | # From v8.1M onwards this range will also NOCP: | |
47 | NOCP_8_1 111- 1111 ---- ---- ---- ---- ---- ---- &nocp cp=10 | |
a3494d46 | 48 | } |