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Peter Maydella3494d42020-08-03 12:18:47 +01001# 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
Peter Maydell83ff3d62020-11-19 21:55:53 +000032%vd_dp 22:1 12:4
33%vd_sp 12:4 22:1
34
Peter Maydell5d2555a2020-10-19 16:12:53 +010035&nocp cp
36
Peter Maydellfa856732021-06-18 15:10:15 +010037# M-profile VLDR/VSTR to sysreg
38%vldr_sysreg 22:1 13:3
39%imm7_0x4 0:7 !function=times_4
40
41&vldr_sysreg rn reg imm a w p
42@vldr_sysreg .... ... . a:1 . . . rn:4 ... . ... .. ....... \
43 reg=%vldr_sysreg imm=%imm7_0x4 &vldr_sysreg
44
Peter Maydella3494d42020-08-03 12:18:47 +010045{
46 # Special cases which do not take an early NOCP: VLLDM and VLSTM
Peter Maydellfe6fa222020-11-19 21:56:09 +000047 VLLDM_VLSTM 1110 1100 001 l:1 rn:4 0000 1010 op:1 000 0000
Peter Maydell83ff3d62020-11-19 21:55:53 +000048 # VSCCLRM (new in v8.1M) is similar:
49 VSCCLRM 1110 1100 1.01 1111 .... 1011 imm:7 0 vd=%vd_dp size=3
50 VSCCLRM 1110 1100 1.01 1111 .... 1010 imm:8 vd=%vd_sp size=2
Peter Maydella3494d42020-08-03 12:18:47 +010051
Peter Maydellfa856732021-06-18 15:10:15 +010052 # FP system register accesses: these are a special case because accesses
53 # to FPCXT_NS succeed even if the FPU is disabled. We therefore need
54 # to handle them before the big NOCP blocks. Note that within these
55 # insns NOCP still has higher priority than UNDEFs; this is implemented
56 # by their returning 'false' for UNDEF so as to fall through into the
57 # NOCP check (in contrast to VLLDM etc, which call unallocated_encoding()
58 # for the UNDEFs there that must take precedence over NOCP.)
59
60 VMSR_VMRS ---- 1110 111 l:1 reg:4 rt:4 1010 0001 0000
61
62 # P=0 W=0 is SEE "Related encodings", so split into two patterns
63 VLDR_sysreg ---- 110 1 . . w:1 1 .... ... 0 111 11 ....... @vldr_sysreg p=1
64 VLDR_sysreg ---- 110 0 . . 1 1 .... ... 0 111 11 ....... @vldr_sysreg p=0 w=1
65 VSTR_sysreg ---- 110 1 . . w:1 0 .... ... 0 111 11 ....... @vldr_sysreg p=1
66 VSTR_sysreg ---- 110 0 . . 1 0 .... ... 0 111 11 ....... @vldr_sysreg p=0 w=1
67
Peter Maydell5d2555a2020-10-19 16:12:53 +010068 NOCP 111- 1110 ---- ---- ---- cp:4 ---- ---- &nocp
69 NOCP 111- 110- ---- ---- ---- cp:4 ---- ---- &nocp
70 # From v8.1M onwards this range will also NOCP:
71 NOCP_8_1 111- 1111 ---- ---- ---- ---- ---- ---- &nocp cp=10
Peter Maydella3494d42020-08-03 12:18:47 +010072}