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Re: [Qemu-devel] [PATCH v4 59/69] target/arm: Convert T16, nop hints
From: |
Philippe Mathieu-Daudé |
Subject: |
Re: [Qemu-devel] [PATCH v4 59/69] target/arm: Convert T16, nop hints |
Date: |
Thu, 5 Sep 2019 12:49:00 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 |
On 9/4/19 9:30 PM, Richard Henderson wrote:
> Reviewed-by: Peter Maydell <address@hidden>
> Signed-off-by: Richard Henderson <address@hidden>
> ---
> target/arm/translate.c | 3 +--
> target/arm/t16.decode | 17 +++++++++++++++++
> 2 files changed, 18 insertions(+), 2 deletions(-)
>
> diff --git a/target/arm/translate.c b/target/arm/translate.c
> index b70491d39e..69092c12c3 100644
> --- a/target/arm/translate.c
> +++ b/target/arm/translate.c
> @@ -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)
> diff --git a/target/arm/t16.decode b/target/arm/t16.decode
> index 19a442b894..5829b9a58c 100644
> --- a/target/arm/t16.decode
> +++ b/target/arm/t16.decode
> @@ -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
> +}
>
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
- Re: [Qemu-devel] [PATCH v4 60/69] target/arm: Split gen_nop_hint, (continued)
- [Qemu-devel] [PATCH v4 58/69] target/arm: Convert T16, Reverse bytes, Richard Henderson, 2019/09/04
- [Qemu-devel] [PATCH v4 52/69] target/arm: Convert T16 one low register and immediate, Richard Henderson, 2019/09/04
- [Qemu-devel] [PATCH v4 55/69] target/arm: Convert T16 adjust sp (immediate), Richard Henderson, 2019/09/04
- [Qemu-devel] [PATCH v4 66/69] target/arm: Convert T16, Unconditional branch, Richard Henderson, 2019/09/04
- [Qemu-devel] [PATCH v4 68/69] target/arm: Clean up disas_thumb_insn, Richard Henderson, 2019/09/04
- [Qemu-devel] [PATCH v4 69/69] target/arm: Inline gen_bx_im into callers, Richard Henderson, 2019/09/04
- [Qemu-devel] [PATCH v4 53/69] target/arm: Convert T16 branch and exchange, Richard Henderson, 2019/09/04
- [Qemu-devel] [PATCH v4 57/69] target/arm: Convert T16, Change processor state, Richard Henderson, 2019/09/04
- [Qemu-devel] [PATCH v4 59/69] target/arm: Convert T16, nop hints, Richard Henderson, 2019/09/04
- Re: [Qemu-devel] [PATCH v4 59/69] target/arm: Convert T16, nop hints,
Philippe Mathieu-Daudé <=
- [Qemu-devel] [PATCH v4 63/69] target/arm: Convert T16, Miscellaneous 16-bit instructions, Richard Henderson, 2019/09/04
- [Qemu-devel] [PATCH v4 64/69] target/arm: Convert T16, shift immediate, Richard Henderson, 2019/09/04
- [Qemu-devel] [PATCH v4 67/69] target/arm: Convert T16, long branches, Richard Henderson, 2019/09/04
- [Qemu-devel] [PATCH v4 62/69] target/arm: Convert T16, Conditional branches, Supervisor call, Richard Henderson, 2019/09/04
- [Qemu-devel] [PATCH v4 56/69] target/arm: Convert T16, extract, Richard Henderson, 2019/09/04
- [Qemu-devel] [PATCH v4 61/69] target/arm: Convert T16, push and pop, Richard Henderson, 2019/09/04
- [Qemu-devel] [PATCH v4 65/69] target/arm: Convert T16, load (literal), Richard Henderson, 2019/09/04
- Re: [Qemu-devel] [PATCH v4 00/69] target/arm: Convert aa32 base isa to decodetree, no-reply, 2019/09/04
- Re: [Qemu-devel] [PATCH v4 00/69] target/arm: Convert aa32 base isa to decodetree, Peter Maydell, 2019/09/05