Re: [PATCH 8/9] disas/riscv: Add support for XVentanaCondOps

[Alistair Francis <alistair23@gmail.com>]

On Tue, May 30, 2023 at 11:23 PM Christoph Muellner
<christoph.muellner@vrull.eu> wrote:
>
> From: Christoph Müllner <christoph.muellner@vrull.eu>
>
> This patch adds XVentanaCondOps support to the RISC-V disassembler.
>
> Co-developed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
> Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

Acked-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

> ---
>  disas/meson.build      |  5 ++++-
>  disas/riscv-xventana.c | 41 +++++++++++++++++++++++++++++++++++++++++
>  disas/riscv-xventana.h | 18 ++++++++++++++++++
>  disas/riscv.c          |  4 ++++
>  4 files changed, 67 insertions(+), 1 deletion(-)
>  create mode 100644 disas/riscv-xventana.c
>  create mode 100644 disas/riscv-xventana.h
>
> diff --git a/disas/meson.build b/disas/meson.build
> index 832727e4b3..e0ee326411 100644
> --- a/disas/meson.build
> +++ b/disas/meson.build
> @@ -6,7 +6,10 @@ common_ss.add(when: 'CONFIG_M68K_DIS', if_true: files('m68k.c'))
>  common_ss.add(when: 'CONFIG_MICROBLAZE_DIS', if_true: files('microblaze.c'))
>  common_ss.add(when: 'CONFIG_MIPS_DIS', if_true: files('mips.c', 'nanomips.c'))
>  common_ss.add(when: 'CONFIG_NIOS2_DIS', if_true: files('nios2.c'))
> -common_ss.add(when: 'CONFIG_RISCV_DIS', if_true: files('riscv.c'))
> +common_ss.add(when: 'CONFIG_RISCV_DIS', if_true: files(
> +    'riscv.c',
> +    'riscv-xventana.c'
> +))
>  common_ss.add(when: 'CONFIG_SH4_DIS', if_true: files('sh4.c'))
>  common_ss.add(when: 'CONFIG_SPARC_DIS', if_true: files('sparc.c'))
>  common_ss.add(when: 'CONFIG_XTENSA_DIS', if_true: files('xtensa.c'))
> diff --git a/disas/riscv-xventana.c b/disas/riscv-xventana.c
> new file mode 100644
> index 0000000000..a0224d1fb3
> --- /dev/null
> +++ b/disas/riscv-xventana.c
> @@ -0,0 +1,41 @@
> +/*
> + * QEMU RISC-V Disassembler for xventana.
> + *
> + * SPDX-License-Identifier: GPL-2.0-or-later
> + */
> +
> +#include "disas/riscv.h"
> +#include "disas/riscv-xventana.h"
> +
> +typedef enum {
> +    /* 0 is reserved for rv_op_illegal. */
> +    ventana_op_vt_maskc = 1,
> +    ventana_op_vt_maskcn = 2,
> +} rv_ventana_op;
> +
> +const rv_opcode_data ventana_opcode_data[] = {
> +    { "vt.illegal", rv_codec_illegal, rv_fmt_none, NULL, 0, 0, 0 },
> +    { "vt.maskc", rv_codec_r, rv_fmt_rd_rs1_rs2, NULL, 0, 0, 0 },
> +    { "vt.maskcn", rv_codec_r, rv_fmt_rd_rs1_rs2, NULL, 0, 0, 0 },
> +};
> +
> +void decode_xventanacondops(rv_decode *dec, rv_isa isa)
> +{
> +    rv_inst inst = dec->inst;
> +    rv_opcode op = rv_op_illegal;
> +
> +    switch (((inst >> 0) & 0b11)) {
> +    case 3:
> +        switch (((inst >> 2) & 0b11111)) {
> +        case 30:
> +            switch (((inst >> 22) & 0b1111111000) | ((inst >> 12) & 0b0000000111)) {
> +            case 6: op = ventana_op_vt_maskc; break;
> +            case 7: op = ventana_op_vt_maskcn; break;
> +            }
> +            break;
> +        }
> +        break;
> +    }
> +
> +    dec->op = op;
> +}
> diff --git a/disas/riscv-xventana.h b/disas/riscv-xventana.h
> new file mode 100644
> index 0000000000..72be9ffa16
> --- /dev/null
> +++ b/disas/riscv-xventana.h
> @@ -0,0 +1,18 @@
> +/*
> + * QEMU disassembler -- RISC-V specific header (xventana*).
> + *
> + * Copyright (c) 2023 VRULL GmbH
> + *
> + * SPDX-License-Identifier: GPL-2.0-or-later
> + */
> +
> +#ifndef DISAS_RISCV_XVENTANA_H
> +#define DISAS_RISCV_XVENTANA_H
> +
> +#include "disas/riscv.h"
> +
> +extern const rv_opcode_data ventana_opcode_data[];
> +
> +void decode_xventanacondops(rv_decode*, rv_isa);
> +
> +#endif /* DISAS_RISCV_XVENTANA_H */
> diff --git a/disas/riscv.c b/disas/riscv.c
> index db98e3ea6a..4f71333c45 100644
> --- a/disas/riscv.c
> +++ b/disas/riscv.c
> @@ -22,6 +22,9 @@
>  #include "disas/riscv.h"
>  #include "target/riscv/cpu-config.h"
>
> +/* Vendor extensions */
> +#include "disas/riscv-xventana.h"
> +
>  typedef enum {
>      /* 0 is reserved for rv_op_illegal. */
>      rv_op_lui = 1,
> @@ -4614,6 +4617,7 @@ disasm_inst(char *buf, size_t buflen, rv_isa isa, uint64_t pc, rv_inst inst,
>          void (*decode_func)(rv_decode *, rv_isa);
>      } decoders[] = {
>          { always_true_p, rvi_opcode_data, decode_inst_opcode },
> +        { has_XVentanaCondOps_p, ventana_opcode_data, decode_xventanacondops },
>      };
>
>      for (size_t i = 0; i < ARRAY_SIZE(decoders); i++) {
> --
> 2.40.1
>
>