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target/mips: Add emulation of MXU instruction D16MUL

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Backports commit 72c9bcf89c59ee1a8e4545069de3efcbeb4d4833 from qemu
This commit is contained in:
Craig Janeczek 2018-11-11 06:59:51 -05:00 committed by Lioncash
parent cad0283888
commit db2e8c1761
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 64 additions and 3 deletions
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67
qemu/target/mips/translate.c
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@ -24325,6 +24325,69 @@ static void gen_mxu_s8ldd(DisasContext *ctx)
tcg_temp_free(tcg_ctx, t1);
}
/*
* D16MUL XRa, XRb, XRc, XRd, optn2 - Signed 16 bit pattern multiplication
*/
static void gen_mxu_d16mul(DisasContext *ctx)
{
TCGContext *tcg_ctx = ctx->uc->tcg_ctx;
TCGv t0, t1, t2, t3;
TCGLabel *l0;
uint32_t XRa, XRb, XRc, XRd, optn2;
t0 = tcg_temp_new(tcg_ctx);
t1 = tcg_temp_new(tcg_ctx);
t2 = tcg_temp_new(tcg_ctx);
t3 = tcg_temp_new(tcg_ctx);
l0 = gen_new_label(tcg_ctx);
XRa = extract32(ctx->opcode, 6, 4);
XRb = extract32(ctx->opcode, 10, 4);
XRc = extract32(ctx->opcode, 14, 4);
XRd = extract32(ctx->opcode, 18, 4);
optn2 = extract32(ctx->opcode, 22, 2);
gen_load_mxu_cr(ctx, t0);
tcg_gen_andi_tl(tcg_ctx, t0, t0, MXU_CR_MXU_EN);
tcg_gen_brcondi_tl(tcg_ctx, TCG_COND_NE, t0, MXU_CR_MXU_EN, l0);
gen_load_mxu_gpr(ctx, t1, XRb);
tcg_gen_sextract_tl(tcg_ctx, t0, t1, 0, 16);
tcg_gen_sextract_tl(tcg_ctx, t1, t1, 16, 16);
gen_load_mxu_gpr(ctx, t3, XRc);
tcg_gen_sextract_tl(tcg_ctx, t2, t3, 0, 16);
tcg_gen_sextract_tl(tcg_ctx, t3, t3, 16, 16);
switch (optn2) {
case MXU_OPTN2_WW: /* XRB.H*XRC.H == lop, XRB.L*XRC.L == rop */
tcg_gen_mul_tl(tcg_ctx, t3, t1, t3);
tcg_gen_mul_tl(tcg_ctx, t2, t0, t2);
break;
case MXU_OPTN2_LW: /* XRB.L*XRC.H == lop, XRB.L*XRC.L == rop */
tcg_gen_mul_tl(tcg_ctx, t3, t0, t3);
tcg_gen_mul_tl(tcg_ctx, t2, t0, t2);
break;
case MXU_OPTN2_HW: /* XRB.H*XRC.H == lop, XRB.H*XRC.L == rop */
tcg_gen_mul_tl(tcg_ctx, t3, t1, t3);
tcg_gen_mul_tl(tcg_ctx, t2, t1, t2);
break;
case MXU_OPTN2_XW: /* XRB.L*XRC.H == lop, XRB.H*XRC.L == rop */
tcg_gen_mul_tl(tcg_ctx, t3, t0, t3);
tcg_gen_mul_tl(tcg_ctx, t2, t1, t2);
break;
}
gen_store_mxu_gpr(ctx, t3, XRa);
gen_store_mxu_gpr(ctx, t2, XRd);
gen_set_label(tcg_ctx, l0);
tcg_temp_free(tcg_ctx, t0);
tcg_temp_free(tcg_ctx, t1);
tcg_temp_free(tcg_ctx, t2);
tcg_temp_free(tcg_ctx, t3);
}
/*
* Decoding engine for MXU
@ -25289,9 +25352,7 @@ static void decode_opc_mxu(CPUMIPSState *env, DisasContext *ctx)
decode_opc_mxu__pool02(env, ctx);
break;
case OPC_MXU_D16MUL:
/* TODO: Implement emulation of D16MUL instruction. */
MIPS_INVAL("OPC_MXU_D16MUL");
generate_exception_end(ctx, EXCP_RI);
gen_mxu_d16mul(ctx);
break;
case OPC_MXU__POOL03:
decode_opc_mxu__pool03(env, ctx);