mirror of
https://github.com/yuzu-emu/unicorn.git
synced 2024-12-25 02:25:40 +00:00
2dae268fcb
From v8.1M, disabled-coprocessor handling changes slightly: * coprocessors 8, 9, 14 and 15 are also governed by the cp10 enable bit, like cp11 * an extra range of instruction patterns is considered to be inside the coprocessor space We previously marked these up with TODO comments; implement the correct behaviour. Unfortunately there is no ID register field which indicates this behaviour. We could in theory test an unrelated ID register which indicates guaranteed-to-be-in-v8.1M behaviour like ID_ISAR0.CmpBranch >= 3 (low-overhead-loops), but it seems better to simply define a new ARM_FEATURE_V8_1M feature flag and use it for this and other new-in-v8.1M behaviour that isn't identifiable from the ID registers. Backports commit 5d2555a1fe7370feeb1efbbf276a653040910017
45 lines
1.9 KiB
Plaintext
45 lines
1.9 KiB
Plaintext
# M-profile UserFault.NOCP exception handling
|
|
#
|
|
# Copyright (c) 2020 Linaro, Ltd
|
|
#
|
|
# This library is free software; you can redistribute it and/or
|
|
# modify it under the terms of the GNU Lesser General Public
|
|
# License as published by the Free Software Foundation; either
|
|
# version 2.1 of the License, or (at your option) any later version.
|
|
#
|
|
# This library 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
|
|
# Lesser General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public
|
|
# License along with this library; if not, see <http://www.gnu.org/licenses/>.
|
|
|
|
#
|
|
# This file is processed by scripts/decodetree.py
|
|
#
|
|
# For M-profile, the architecture specifies that NOCP UsageFaults
|
|
# should take precedence over UNDEF faults over the whole wide
|
|
# range of coprocessor-space encodings, with the exception of
|
|
# VLLDM and VLSTM. (Compare v8.1M IsCPInstruction() pseudocode and
|
|
# v8M Arm ARM rule R_QLGM.) This isn't mandatory for v8.0M but we choose
|
|
# to behave the same as v8.1M.
|
|
# This decode is handled before any others (and in particular before
|
|
# decoding FP instructions which are in the coprocessor space).
|
|
# If the coprocessor is not present or disabled then we will generate
|
|
# the NOCP exception; otherwise we let the insn through to the main decode.
|
|
|
|
&nocp cp
|
|
|
|
{
|
|
# Special cases which do not take an early NOCP: VLLDM and VLSTM
|
|
VLLDM_VLSTM 1110 1100 001 l:1 rn:4 0000 1010 0000 0000
|
|
# TODO: VSCCLRM (new in v8.1M) is similar:
|
|
#VSCCLRM 1110 1100 1-01 1111 ---- 1011 ---- ---0
|
|
|
|
NOCP 111- 1110 ---- ---- ---- cp:4 ---- ---- &nocp
|
|
NOCP 111- 110- ---- ---- ---- cp:4 ---- ---- &nocp
|
|
# From v8.1M onwards this range will also NOCP:
|
|
NOCP_8_1 111- 1111 ---- ---- ---- ---- ---- ---- &nocp cp=10
|
|
}
|