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target/mips: Add emulation of MXU instructions S32LDD and S32LDDR 

Add support for emulating the S32LDD and S32LDDR MXU instructions.

Reviewed-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Signed-off-by: Craig Janeczek <jancraig@amazon.com>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
This commit is contained in:
Craig Janeczek 2018-10-18 22:45:39 +02:00 committed by Aleksandar Markovic
parent a9a4181bdb
commit 4ca837218c
1 changed files with 47 additions and 7 deletions
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54
target/mips/translate.c
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@ -24416,6 +24416,52 @@ static void gen_mxu_q8mul_q8mulsu(DisasContext *ctx)
tcg_temp_free(t7);
}
/*
* S32LDD XRa, Rb, S12 - Load a word from memory to XRF
* S32LDDR XRa, Rb, S12 - Load a word from memory to XRF, reversed byte seq.
*/
static void gen_mxu_s32ldd_s32lddr(DisasContext *ctx)
{
TCGv t0, t1;
TCGLabel *l0;
uint32_t XRa, Rb, s12, sel;
t0 = tcg_temp_new();
t1 = tcg_temp_new();
l0 = gen_new_label();
XRa = extract32(ctx->opcode, 6, 4);
s12 = extract32(ctx->opcode, 10, 10);
sel = extract32(ctx->opcode, 20, 1);
Rb = extract32(ctx->opcode, 21, 5);
gen_load_mxu_cr(t0);
tcg_gen_andi_tl(t0, t0, MXU_CR_MXU_EN);
tcg_gen_brcondi_tl(TCG_COND_NE, t0, MXU_CR_MXU_EN, l0);
gen_load_gpr(t0, Rb);
tcg_gen_movi_tl(t1, s12);
tcg_gen_shli_tl(t1, t1, 2);
if (s12 & 0x200) {
tcg_gen_ori_tl(t1, t1, 0xFFFFF000);
}
tcg_gen_add_tl(t1, t0, t1);
tcg_gen_qemu_ld_tl(t1, t1, ctx->mem_idx, MO_SL);
if (sel == 1) {
/* S32LDDR */
tcg_gen_bswap32_tl(t1, t1);
}
gen_store_mxu_gpr(t1, XRa);
gen_set_label(l0);
tcg_temp_free(t0);
tcg_temp_free(t1);
}
/*
* Decoding engine for MXU
@ -24645,14 +24691,8 @@ static void decode_opc_mxu__pool04(CPUMIPSState *env, DisasContext *ctx)
switch (opcode) {
case OPC_MXU_S32LDD:
/* TODO: Implement emulation of S32LDD instruction. */
MIPS_INVAL("OPC_MXU_S32LDD");
generate_exception_end(ctx, EXCP_RI);
break;
case OPC_MXU_S32LDDR:
/* TODO: Implement emulation of S32LDDR instruction. */
MIPS_INVAL("OPC_MXU_S32LDDR");
generate_exception_end(ctx, EXCP_RI);
gen_mxu_s32ldd_s32lddr(ctx);
break;
default:
MIPS_INVAL("decode_opc_mxu");