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Re: [PATCH 4/4] disas/riscv: Support zcmop disassemble
From: |
Alistair Francis |
Subject: |
Re: [PATCH 4/4] disas/riscv: Support zcmop disassemble |
Date: |
Tue, 4 Jun 2024 12:23:51 +1000 |
On Wed, May 22, 2024 at 4:33 PM LIU Zhiwei <zhiwei_liu@linux.alibaba.com> wrote:
>
> Although in QEMU disassemble, we usually lift compressed instruction
> to an normal format when display the instruction name. For C.MOP.n,
> it is more reasonable to directly display its compressed name, because
> its behavior can be redefined by later extension.
>
> Signed-off-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Alistair
> ---
> disas/riscv.c | 23 +++++++++++++++++++++++
> 1 file changed, 23 insertions(+)
>
> diff --git a/disas/riscv.c b/disas/riscv.c
> index 4cd769f165..41050246f3 100644
> --- a/disas/riscv.c
> +++ b/disas/riscv.c
> @@ -946,6 +946,14 @@ typedef enum {
> rv_mop_rr_5 = 915,
> rv_mop_rr_6 = 916,
> rv_mop_rr_7 = 917,
> + rv_c_mop_1 = 918,
> + rv_c_mop_3 = 919,
> + rv_c_mop_5 = 920,
> + rv_c_mop_7 = 921,
> + rv_c_mop_9 = 922,
> + rv_c_mop_11 = 923,
> + rv_c_mop_13 = 924,
> + rv_c_mop_15 = 925,
> } rv_op;
>
> /* register names */
> @@ -2176,6 +2184,14 @@ const rv_opcode_data rvi_opcode_data[] = {
> { "mop.rr.5", rv_codec_r, rv_fmt_rd_rs1_rs2, NULL, 0, 0, 0 },
> { "mop.rr.6", rv_codec_r, rv_fmt_rd_rs1_rs2, NULL, 0, 0, 0 },
> { "mop.rr.7", rv_codec_r, rv_fmt_rd_rs1_rs2, NULL, 0, 0, 0 },
> + { "c.mop.1", rv_codec_ci_none, rv_fmt_none, NULL, 0, 0, 0 },
> + { "c.mop.3", rv_codec_ci_none, rv_fmt_none, NULL, 0, 0, 0 },
> + { "c.mop.5", rv_codec_ci_none, rv_fmt_none, NULL, 0, 0, 0 },
> + { "c.mop.7", rv_codec_ci_none, rv_fmt_none, NULL, 0, 0, 0 },
> + { "c.mop.9", rv_codec_ci_none, rv_fmt_none, NULL, 0, 0, 0 },
> + { "c.mop.11", rv_codec_ci_none, rv_fmt_none, NULL, 0, 0, 0 },
> + { "c.mop.13", rv_codec_ci_none, rv_fmt_none, NULL, 0, 0, 0 },
> + { "c.mop.15", rv_codec_ci_none, rv_fmt_none, NULL, 0, 0, 0 },
> };
>
> /* CSR names */
> @@ -2469,6 +2485,13 @@ static void decode_inst_opcode(rv_decode *dec, rv_isa
> isa)
> break;
> case 2: op = rv_op_c_li; break;
> case 3:
> + if (dec->cfg->ext_zcmop) {
> + if ((((inst >> 2) & 0b111111) == 0b100000) &&
> + (((inst >> 11) & 0b11) == 0b0)) {
> + op = rv_c_mop_1 + ((inst >> 8) & 0b111);
> + break;
> + }
> + }
> switch ((inst >> 7) & 0b11111) {
> case 2: op = rv_op_c_addi16sp; break;
> default: op = rv_op_c_lui; break;
> --
> 2.25.1
>
>
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Alistair Francis <=