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target/arm: Convert T16, nop hints 

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20190904193059.26202-60-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2019-09-04 12:30:49 -07:00 committed by Peter Maydell
parent ae3002b021
commit 56e6250ede
2 changed files with 18 additions and 2 deletions
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17
target/arm/t16.decode
View File

@ -19,6 +19,7 @@
# This file is processed by scripts/decodetree.py
#
&empty !extern
&s_rrr_shi !extern s rd rn rm shim shty
&s_rrr_shr !extern s rn rd rm rs shty
&s_rri_rot !extern s rn rd imm rot
@ -204,3 +205,19 @@ SETEND 1011 0110 010 1 E:1 000 &setend
REV 1011 1010 00 ... ... @rdm
REV16 1011 1010 01 ... ... @rdm
REVSH 1011 1010 11 ... ... @rdm
# Hints
{
YIELD 1011 1111 0001 0000
WFE 1011 1111 0010 0000
WFI 1011 1111 0011 0000
# TODO: Implement SEV, SEVL; may help SMP performance.
# SEV 1011 1111 0100 0000
# SEVL 1011 1111 0101 0000
# The canonical nop has the second nibble as 0000, but the whole of the
# rest of the space is a reserved hint, behaves as nop.
NOP 1011 1111 ---- 0000
}

3
target/arm/translate.c
View File

@ -10891,8 +10891,7 @@ static void disas_thumb_insn(DisasContext *s, uint32_t insn)
case 15: /* IT, nop-hint. */
if ((insn & 0xf) == 0) {
gen_nop_hint(s, (insn >> 4) & 0xf);
break;
goto illegal_op; /* nop hint, in decodetree */
}
/*
* IT (If-Then)