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Re: [Qemu-devel] [PATCH v3 3/8] target/mips: Add MXU instructions S32I2M
From: |
Janeczek, Craig |
Subject: |
Re: [Qemu-devel] [PATCH v3 3/8] target/mips: Add MXU instructions S32I2M and S32M2I |
Date: |
Tue, 28 Aug 2018 14:50:06 +0000 |
What happens if reg > 16? Also, the argument reg should be unsigned.
If rev > 16 the instruction is invalid. What type of error can/should I throw
here.
This does not handle the case xra == XR16. From the doc:
I do not see where the case is un-handled. XR16 maps to index 15 in the mxu_gpr
array.
-----Original Message-----
From: Aleksandar Markovic <address@hidden>
Sent: Tuesday, August 28, 2018 10:43 AM
To: Janeczek, Craig <address@hidden>; address@hidden
Cc: address@hidden
Subject: Re: [PATCH v3 3/8] target/mips: Add MXU instructions S32I2M and S32M2I
> From: Craig Janeczek <address@hidden>
> Sent: Tuesday, August 28, 2018 3:00 PM
> To: address@hidden
> Cc: Aleksandar Markovic; address@hidden; Craig Janeczek
> Subject: [PATCH v3 3/8] target/mips: Add MXU instructions S32I2M and
> S32M2I
>
> This commit makes the MXU registers and the utility functions for
> reading/writing to them. This is required for full MXU instruction
> support.
>
> Adds support for emulating the S32I2M and S32M2I MXU instructions.
>
> Signed-off-by: Craig Janeczek <address@hidden>
> ---
> v1
> - initial patch
> v2
> - Fix checkpatch.pl errors
> - remove mips64 ifdef
> - changed bitfield usage to extract32
> - squashed register addition patch into this one
> v3
> - Split register addition and opcode enum definition into seperate patches
> - Split gen_mxu function into command specific gen_mxu_<ins>
> functions
>
> target/mips/translate.c | 62
> +++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 62 insertions(+)
>
> diff --git a/target/mips/translate.c b/target/mips/translate.c index
> ae6b16ecd7..f6991aa8ef 100644
> --- a/target/mips/translate.c
> +++ b/target/mips/translate.c
> @@ -1610,6 +1610,23 @@ static inline void gen_store_gpr (TCGv t, int reg)
> tcg_gen_mov_tl(cpu_gpr[reg], t); }
>
> +/* MXU General purpose registers moves. */ static inline void
> +gen_load_mxu_gpr(TCGv t, int reg) {
> + if (reg == 0) {
> + tcg_gen_movi_tl(t, 0);
> + } else {
> + tcg_gen_mov_tl(t, mxu_gpr[reg - 1]);
> + }
> +}
What happens if reg > 16? Also, the argument reg should be unsigned.
> +
> +static inline void gen_store_mxu_gpr(TCGv t, int reg) {
> + if (reg != 0) {
> + tcg_gen_mov_tl(mxu_gpr[reg - 1], t);
> + }
> +}
> +
What happens if reg > 16? Also, the argument reg should be unsigned.
> /* Moves to/from shadow registers. */ static inline void
> gen_load_srsgpr (int from, int to) { @@ -3798,6 +3815,42 @@ static
> void gen_cl (DisasContext *ctx, uint32_t opc,
> }
> }
>
> +/* MXU Instructions */
> +
> +/* S32I2M XRa, rb - Register move from GRF to XRF */ static void
> +gen_mxu_s32i2m(DisasContext *ctx, uint32_t opc) {
> + TCGv t0;
> + uint32_t xra, rb;
> +
> + t0 = tcg_temp_new();
> +
> + xra = extract32(ctx->opcode, 6, 5);
> + rb = extract32(ctx->opcode, 16, 5);
> +
> + gen_load_gpr(t0, rb);
> + gen_store_mxu_gpr(t0, xra);
> +
> + tcg_temp_free(t0);
> +}
This does not handle the case xra == XR16. From the doc:
"In MXU, a dedicated register file named XRF comprises sixteen 32-bit general
purpose registers - XR0~XR15. XR0 is a special one, which always is read as
zero. Moreover, XR16 is an alias of MXU_CR described below and it can only be
accessed by S32I2M/S32M2I instructions."
> +
> +/* S32M2I XRa, rb - Register move from XRF to GRF */ static void
> +gen_mxu_s32m2i(DisasContext *ctx, uint32_t opc) {
> + TCGv t0;
> + uint32_t xra, rb;
> +
> + t0 = tcg_temp_new();
> +
> + xra = extract32(ctx->opcode, 6, 5);
> + rb = extract32(ctx->opcode, 16, 5);
> +
> + gen_load_mxu_gpr(t0, xra);
> + gen_store_gpr(t0, rb);
> +
> + tcg_temp_free(t0);
> +}
> +
> /* Godson integer instructions */
> static void gen_loongson_integer(DisasContext *ctx, uint32_t opc,
> int rd, int rs, int rt) @@ -17894,6
> +17947,15 @@ static void decode_opc_special2_legacy(CPUMIPSState *env,
> DisasContext *ctx)
> check_insn(ctx, INSN_LOONGSON2F);
> gen_loongson_integer(ctx, op1, rd, rs, rt);
> break;
> +
> + case OPC_MXU_S32I2M:
> + gen_mxu_s32i2m(ctx, op1);
> + break;
> +
> + case OPC_MXU_S32M2I:
> + gen_mxu_s32m2i(ctx, op1);
> + break;
> +
> case OPC_CLO:
> case OPC_CLZ:
> check_insn(ctx, ISA_MIPS32);
[Qemu-devel] [PATCH v3 6/8] target/mips: Add MXU instruction D16MAC, Craig Janeczek, 2018/08/28
[Qemu-devel] [PATCH v3 2/8] target/mips: Add all MXU opcodes, Craig Janeczek, 2018/08/28