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It has no ID enable, being back-allocated into the hint nop space. Signed-off-by: Richard Henderson Reviewed-by: Gustavo Romero Reviewed-by: Pierrick Bouvier --- target/arm/tcg/translate-a64.c | 14 ++++++++++++++ docs/system/arm/emulation.rst | 1 + target/arm/tcg/a64.decode | 1 + 3 files changed, 16 insertions(+) diff --git a/target/arm/tcg/translate-a64.c b/target/arm/tcg/translate-a64.c index 7831b3dab3..34d22cac8a 100644 --- a/target/arm/tcg/translate-a64.c +++ b/target/arm/tcg/translate-a64.c @@ -2124,6 +2124,20 @@ static bool trans_AUTIBSP(DisasContext *s, arg_AUTIB= SP *a) return true; } =20 +static bool trans_CHKFEAT(DisasContext *s, arg_CHKFEAT *a) +{ + uint64_t feat_en =3D 0; + + if (s->gcs_en) { + feat_en |=3D 1 << 0; + } + if (feat_en) { + TCGv_i64 x16 =3D cpu_reg(s, 16); + tcg_gen_andi_i64(x16, x16, ~feat_en); + } + return true; +} + static bool trans_CLREX(DisasContext *s, arg_CLREX *a) { tcg_gen_movi_i64(cpu_exclusive_addr, -1); diff --git a/docs/system/arm/emulation.rst b/docs/system/arm/emulation.rst index 6ebf9c9ce9..b894aced89 100644 --- a/docs/system/arm/emulation.rst +++ b/docs/system/arm/emulation.rst @@ -28,6 +28,7 @@ the following architecture extensions: - FEAT_BF16 (AArch64 BFloat16 instructions) - FEAT_BTI (Branch Target Identification) - FEAT_CCIDX (Extended cache index) +- FEAT_CHK (Check Feature Status) - FEAT_CMOW (Control for cache maintenance permission) - FEAT_CRC32 (CRC32 instructions) - FEAT_Crypto (Cryptographic Extension) diff --git a/target/arm/tcg/a64.decode b/target/arm/tcg/a64.decode index 8c798cde2b..4315ed8dab 100644 --- a/target/arm/tcg/a64.decode +++ b/target/arm/tcg/a64.decode @@ -246,6 +246,7 @@ ERETA 1101011 0100 11111 00001 m:1 11111 1111= 1 &reta # ERETAA, ERETAB AUTIASP 1101 0101 0000 0011 0010 0011 101 11111 AUTIBZ 1101 0101 0000 0011 0010 0011 110 11111 AUTIBSP 1101 0101 0000 0011 0010 0011 111 11111 + CHKFEAT 1101 0101 0000 0011 0010 0101 000 11111 ] # The canonical NOP has CRm =3D=3D op2 =3D=3D 0, but all of the space # that isn't specifically allocated to an instruction must NOP --=20 2.43.0