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target/microblaze: Add decodetree infrastructure 

The new interface is a stub that recognizes no instructions.
It falls back to the old decoder for all instructions.

Tested-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-08-17 09:42:44 -07:00
parent d7ecb757d1
commit 44d1432ba2
3 changed files with 30 additions and 2 deletions
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18
target/microblaze/insns.decode Normal file
View File

@ -0,0 +1,18 @@
#
# MicroBlaze instruction decode definitions.
#
# Copyright (c) 2020 Richard Henderson <rth@twiddle.net>
#
# 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/>.
#

3
target/microblaze/meson.build
View File

@ -1,4 +1,7 @@
gen = decodetree.process('insns.decode')
microblaze_ss = ss.source_set()
microblaze_ss.add(gen)
microblaze_ss.add(files(
'cpu.c',
'gdbstub.c',

11
target/microblaze/translate.c
View File

@ -81,6 +81,9 @@ typedef struct DisasContext {
int abort_at_next_insn;
} DisasContext;
/* Include the auto-generated decoder. */
#include "decode-insns.c.inc"
static inline void t_sync_flags(DisasContext *dc)
{
/* Synch the tb dependent flags between translator and runtime. */
@ -1506,7 +1509,7 @@ static struct decoder_info {
{{0, 0}, dec_null}
};
static inline void decode(DisasContext *dc, uint32_t ir)
static void old_decode(DisasContext *dc, uint32_t ir)
{
int i;
@ -1584,6 +1587,7 @@ static void mb_tr_translate_insn(DisasContextBase *dcb, CPUState *cs)
{
DisasContext *dc = container_of(dcb, DisasContext, base);
CPUMBState *env = cs->env_ptr;
uint32_t ir;
/* TODO: This should raise an exception, not terminate qemu. */
if (dc->base.pc_next & 3) {
@ -1592,7 +1596,10 @@ static void mb_tr_translate_insn(DisasContextBase *dcb, CPUState *cs)
}
dc->clear_imm = 1;
decode(dc, cpu_ldl_code(env, dc->base.pc_next));
ir = cpu_ldl_code(env, dc->base.pc_next);
if (!decode(dc, ir)) {
old_decode(dc, ir);
}
if (dc->clear_imm && (dc->tb_flags & IMM_FLAG)) {
dc->tb_flags &= ~IMM_FLAG;
tcg_gen_discard_i32(cpu_imm);