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unicorn/qemu/target/arm/neon-shared.decode

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target/arm: Add stubs for AArch32 Neon decodetree Add the infrastructure for building and invoking a decodetree decoder for the AArch32 Neon encodings. At the moment the new decoder covers nothing, so we always fall back to the existing hand-written decode. We follow the same pattern we did for the VFP decodetree conversion (commit 78e138bc1f672c145ef6ace74617d and following): code that deals with Neon will be moving gradually out to translate-neon.vfp.inc, which we #include into translate.c. In order to share the decode files between A32 and T32, we split Neon into 3 parts: * data-processing * load-store * 'shared' encodings The first two groups of instructions have similar but not identical A32 and T32 encodings, so we need to manually transform the T32 encoding into the A32 one before calling the decoder; the third group covers the Neon instructions which are identical in A32 and T32. Backports commit 625e3dd44a15dfbe9532daa6454df3f86cf04d3e from qemu
2020-05-07 12:59:38 +00:00
# AArch32 Neon instruction descriptions
#
# 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 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
#
# Encodings for Neon instructions whose encoding is the same for
# both A32 and T32.
# More specifically, this covers:
# 2reg scalar ext: 0b1111_1110_xxxx_xxxx_xxxx_1x0x_xxxx_xxxx
# 3same ext: 0b1111_110x_xxxx_xxxx_xxxx_1x0x_xxxx_xxxx
target/arm: Convert VCMLA (vector) to decodetree Convert the VCMLA (vector) insns in the 3same extension group to decodetree. Backports commit afff8de0d4d55b4ce7c36eb9cdfafe477a35dd75 from qemu
2020-05-07 13:02:49 +00:00
# VFP/Neon register fields; same as vfp.decode
%vm_dp 5:1 0:4
%vm_sp 0:4 5:1
%vn_dp 7:1 16:4
%vn_sp 16:4 7:1
%vd_dp 22:1 12:4
%vd_sp 12:4 22:1
target/arm: Convert VCMLA, VCADD size field to MO_* in decode The VCMLA and VCADD insns have a size field which is 0 for fp16 and 1 for fp32 (note that this is the reverse of the Neon 3-same encoding!). Convert it to MO_* values in decode for consistency. Backports d186a4854c04e9832907b0b4240a47731da20993
2021-03-01 23:23:31 +00:00
# For VCMLA/VCADD insns, convert the single-bit size field
# which is 0 for fp16 and 1 for fp32 into a MO_* constant.
# (Note that this is the reverse of the sense of the 1-bit size
# field in the 3same_fp Neon insns.)
%vcadd_size 20:1 !function=plus1
target/arm: Convert VCADD (vector) to decodetree Convert the VCADD (vector) insns to decodetree. Backports commit 94d5eb7b3f72fbbdee55d7908e9cb6de95949f4b from qemu
2020-05-07 13:05:53 +00:00
target/arm: Convert VCMLA, VCADD size field to MO_* in decode The VCMLA and VCADD insns have a size field which is 0 for fp16 and 1 for fp32 (note that this is the reverse of the Neon 3-same encoding!). Convert it to MO_* values in decode for consistency. Backports d186a4854c04e9832907b0b4240a47731da20993
2021-03-01 23:23:31 +00:00
VCMLA 1111 110 rot:2 . 1 . .... .... 1000 . q:1 . 0 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp size=%vcadd_size
VCADD 1111 110 rot:1 1 . 0 . .... .... 1000 . q:1 . 0 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp size=%vcadd_size
target/arm: Convert V[US]DOT (vector) to decodetree Convert the V[US]DOT (vector) insns to decodetree. Backports commit 32da0e330d3e5218b669079826496751fb52c1ca from qemu
2020-05-07 13:09:22 +00:00
# VUDOT and VSDOT
VDOT 1111 110 00 . 10 .... .... 1101 . q:1 . u:1 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp
target/arm: Convert VFM[AS]L (vector) to decodetree Convert the VFM[AS]L (vector) insns to decodetree. This is the last insn in the legacy decoder for the 3same_ext group, so we can delete the legacy decoder function for the group entirely. Note that in disas_thumb2_insn() the parts of this encoding space where the decodetree decoder returns false will correctly be directed to illegal_op by the "(insn & (1 << 28))" check so they won't fall into disas_coproc_insn() by mistake. Backports commit 9a107e7b8a3c87ab63ec830d3d60f319fc577ff7 from qemu
2020-05-07 13:12:13 +00:00
# VFM[AS]L
VFML 1111 110 0 s:1 . 10 .... .... 1000 . 0 . 1 .... \
vm=%vm_sp vn=%vn_sp vd=%vd_dp q=0
VFML 1111 110 0 s:1 . 10 .... .... 1000 . 1 . 1 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp q=1
target/arm: Convert VCMLA (scalar) to decodetree Convert VCMLA (scalar) in the 2reg-scalar-ext group to decodetree. Backports commit 7e1b5d615361bb0038cda0e08af41e350e42d081 from qemu
2020-05-07 13:15:27 +00:00
VCMLA_scalar 1111 1110 0 . rot:2 .... .... 1000 . q:1 index:1 0 vm:4 \
target/arm: Convert VCMLA, VCADD size field to MO_* in decode The VCMLA and VCADD insns have a size field which is 0 for fp16 and 1 for fp32 (note that this is the reverse of the Neon 3-same encoding!). Convert it to MO_* values in decode for consistency. Backports d186a4854c04e9832907b0b4240a47731da20993
2021-03-01 23:23:31 +00:00
vn=%vn_dp vd=%vd_dp size=1
target/arm: Convert VCMLA (scalar) to decodetree Convert VCMLA (scalar) in the 2reg-scalar-ext group to decodetree. Backports commit 7e1b5d615361bb0038cda0e08af41e350e42d081 from qemu
2020-05-07 13:15:27 +00:00
VCMLA_scalar 1111 1110 1 . rot:2 .... .... 1000 . q:1 . 0 .... \
target/arm: Convert VCMLA, VCADD size field to MO_* in decode The VCMLA and VCADD insns have a size field which is 0 for fp16 and 1 for fp32 (note that this is the reverse of the Neon 3-same encoding!). Convert it to MO_* values in decode for consistency. Backports d186a4854c04e9832907b0b4240a47731da20993
2021-03-01 23:23:31 +00:00
vm=%vm_dp vn=%vn_dp vd=%vd_dp size=2 index=0
target/arm: Convert V[US]DOT (scalar) to decodetree Convert the V[US]DOT (scalar) insns in the 2reg-scalar-ext group to decodetree. Backports commit 35f5d4d1747558c6af2d914bcd848dcc30c3b531 from qemu
2020-05-07 13:17:30 +00:00
VDOT_scalar 1111 1110 0 . 10 .... .... 1101 . q:1 index:1 u:1 rm:4 \
vm=%vm_dp vn=%vn_dp vd=%vd_dp
target/arm: Convert VFM[AS]L (scalar) to decodetree Convert the VFM[AS]L (scalar) insns in the 2reg-scalar-ext group to decodetree. These are the last ones in the group so we can remove all the legacy decode for the group. Note that in disas_thumb2_insn() the parts of this encoding space where the decodetree decoder returns false will correctly be directed to illegal_op by the "(insn & (1 << 28))" check so they won't fall into disas_coproc_insn() by mistake. Backports commit d27e82f7d02f35e5919bd9cbbcb157f3537069a0 from qemu
2020-05-07 13:20:33 +00:00
%vfml_scalar_q0_rm 0:3 5:1
%vfml_scalar_q1_index 5:1 3:1
VFML_scalar 1111 1110 0 . 0 s:1 .... .... 1000 . 0 . 1 index:1 ... \
rm=%vfml_scalar_q0_rm vn=%vn_sp vd=%vd_dp q=0
VFML_scalar 1111 1110 0 . 0 s:1 .... .... 1000 . 1 . 1 . rm:3 \
index=%vfml_scalar_q1_index vn=%vn_dp vd=%vd_dp q=1
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