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target-mips: add Loongson support prefetch 

Loongson CPU uses a load to zero register for prefetch.
Emulate it as a NOP.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2010-07-01 23:43:34 +02:00
parent 5c13fdfd03
commit afa88c3ae5
1 changed files with 43 additions and 35 deletions
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78
target-mips/translate.c
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@ -1006,16 +1006,24 @@ static target_ulong pc_relative_pc (DisasContext *ctx)
}
/* Load */
static void gen_ld (DisasContext *ctx, uint32_t opc, int rt,
int base, int16_t offset)
static void gen_ld (CPUState *env, DisasContext *ctx, uint32_t opc,
int rt, int base, int16_t offset)
{
const char *opn = "ld";
TCGv t0 = tcg_temp_new();
TCGv t1 = tcg_temp_new();
TCGv t0, t1;
if (rt == 0 && env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F)) {
/* Loongson CPU uses a load to zero register for prefetch.
We emulate it as a NOP. On other CPU we must perform the
actual memory access. */
MIPS_DEBUG("NOP");
return;
}
t0 = tcg_temp_new();
t1 = tcg_temp_new();
gen_base_offset_addr(ctx, t0, base, offset);
/* Don't do NOP if destination is zero: we must perform the actual
memory access. */
switch (opc) {
#if defined(TARGET_MIPS64)
case OPC_LWU:
@ -8258,7 +8266,7 @@ static void decode_i64_mips16 (CPUState *env, DisasContext *ctx,
case I64_LDSP:
check_mips_64(ctx);
offset = extended ? offset : offset << 3;
gen_ld(ctx, OPC_LD, ry, 29, offset);
gen_ld(env, ctx, OPC_LD, ry, 29, offset);
break;
case I64_SDSP:
check_mips_64(ctx);
@ -8280,7 +8288,7 @@ static void decode_i64_mips16 (CPUState *env, DisasContext *ctx,
generate_exception(ctx, EXCP_RI);
} else {
offset = extended ? offset : offset << 3;
gen_ld(ctx, OPC_LDPC, ry, 0, offset);
gen_ld(env, ctx, OPC_LDPC, ry, 0, offset);
}
break;
case I64_DADDIU5:
@ -8364,7 +8372,7 @@ static int decode_extended_mips16_opc (CPUState *env, DisasContext *ctx,
#if defined(TARGET_MIPS64)
case M16_OPC_LD:
check_mips_64(ctx);
gen_ld(ctx, OPC_LD, ry, rx, offset);
gen_ld(env, ctx, OPC_LD, ry, rx, offset);
break;
#endif
case M16_OPC_RRIA:
@ -8444,29 +8452,29 @@ static int decode_extended_mips16_opc (CPUState *env, DisasContext *ctx,
break;
#endif
case M16_OPC_LB:
gen_ld(ctx, OPC_LB, ry, rx, offset);
gen_ld(env, ctx, OPC_LB, ry, rx, offset);
break;
case M16_OPC_LH:
gen_ld(ctx, OPC_LH, ry, rx, offset);
gen_ld(env, ctx, OPC_LH, ry, rx, offset);
break;
case M16_OPC_LWSP:
gen_ld(ctx, OPC_LW, rx, 29, offset);
gen_ld(env, ctx, OPC_LW, rx, 29, offset);
break;
case M16_OPC_LW:
gen_ld(ctx, OPC_LW, ry, rx, offset);
gen_ld(env, ctx, OPC_LW, ry, rx, offset);
break;
case M16_OPC_LBU:
gen_ld(ctx, OPC_LBU, ry, rx, offset);
gen_ld(env, ctx, OPC_LBU, ry, rx, offset);
break;
case M16_OPC_LHU:
gen_ld(ctx, OPC_LHU, ry, rx, offset);
gen_ld(env, ctx, OPC_LHU, ry, rx, offset);
break;
case M16_OPC_LWPC:
gen_ld(ctx, OPC_LWPC, rx, 0, offset);
gen_ld(env, ctx, OPC_LWPC, rx, 0, offset);
break;
#if defined(TARGET_MIPS64)
case M16_OPC_LWU:
gen_ld(ctx, OPC_LWU, ry, rx, offset);
gen_ld(env, ctx, OPC_LWU, ry, rx, offset);
break;
#endif
case M16_OPC_SB:
@ -8572,7 +8580,7 @@ static int decode_mips16_opc (CPUState *env, DisasContext *ctx,
#if defined(TARGET_MIPS64)
case M16_OPC_LD:
check_mips_64(ctx);
gen_ld(ctx, OPC_LD, ry, rx, offset << 3);
gen_ld(env, ctx, OPC_LD, ry, rx, offset << 3);
break;
#endif
case M16_OPC_RRIA:
@ -8695,30 +8703,30 @@ static int decode_mips16_opc (CPUState *env, DisasContext *ctx,
break;
#endif
case M16_OPC_LB:
gen_ld(ctx, OPC_LB, ry, rx, offset);
gen_ld(env, ctx, OPC_LB, ry, rx, offset);
break;
case M16_OPC_LH:
gen_ld(ctx, OPC_LH, ry, rx, offset << 1);
gen_ld(env, ctx, OPC_LH, ry, rx, offset << 1);
break;
case M16_OPC_LWSP:
gen_ld(ctx, OPC_LW, rx, 29, ((uint8_t)ctx->opcode) << 2);
gen_ld(env, ctx, OPC_LW, rx, 29, ((uint8_t)ctx->opcode) << 2);
break;
case M16_OPC_LW:
gen_ld(ctx, OPC_LW, ry, rx, offset << 2);
gen_ld(env, ctx, OPC_LW, ry, rx, offset << 2);
break;
case M16_OPC_LBU:
gen_ld(ctx, OPC_LBU, ry, rx, offset);
gen_ld(env, ctx, OPC_LBU, ry, rx, offset);
break;
case M16_OPC_LHU:
gen_ld(ctx, OPC_LHU, ry, rx, offset << 1);
gen_ld(env, ctx, OPC_LHU, ry, rx, offset << 1);
break;
case M16_OPC_LWPC:
gen_ld(ctx, OPC_LWPC, rx, 0, ((uint8_t)ctx->opcode) << 2);
gen_ld(env, ctx, OPC_LWPC, rx, 0, ((uint8_t)ctx->opcode) << 2);
break;
#if defined (TARGET_MIPS64)
case M16_OPC_LWU:
check_mips_64(ctx);
gen_ld(ctx, OPC_LWU, ry, rx, offset << 2);
gen_ld(env, ctx, OPC_LWU, ry, rx, offset << 2);
break;
#endif
case M16_OPC_SB:
@ -10846,7 +10854,7 @@ static void decode_micromips32_opc (CPUState *env, DisasContext *ctx,
mips32_op = OPC_LL;
goto do_ld_lr;
do_ld_lr:
gen_ld(ctx, mips32_op, rt, rs, SIMM(ctx->opcode, 0, 12));
gen_ld(env, ctx, mips32_op, rt, rs, SIMM(ctx->opcode, 0, 12));
break;
do_st_lr:
gen_st(ctx, mips32_op, rt, rs, SIMM(ctx->opcode, 0, 12));
@ -10984,7 +10992,7 @@ static void decode_micromips32_opc (CPUState *env, DisasContext *ctx,
mips32_op = OPC_SW;
goto do_st;
do_ld:
gen_ld(ctx, mips32_op, rt, rs, imm);
gen_ld(env, ctx, mips32_op, rt, rs, imm);
break;
do_st:
gen_st(ctx, mips32_op, rt, rs, imm);
@ -11137,7 +11145,7 @@ static int decode_micromips_opc (CPUState *env, DisasContext *ctx, int *is_branc
int rb = 28; /* GP */
int16_t offset = SIMM(ctx->opcode, 0, 7) << 2;
gen_ld(ctx, OPC_LW, rd, rb, offset);
gen_ld(env, ctx, OPC_LW, rd, rb, offset);
}
break;
case POOL16F:
@ -11169,7 +11177,7 @@ static int decode_micromips_opc (CPUState *env, DisasContext *ctx, int *is_branc
int16_t offset = ZIMM(ctx->opcode, 0, 4);
offset = (offset == 0xf ? -1 : offset);
gen_ld(ctx, OPC_LBU, rd, rb, offset);
gen_ld(env, ctx, OPC_LBU, rd, rb, offset);
}
break;
case LHU16:
@ -11178,7 +11186,7 @@ static int decode_micromips_opc (CPUState *env, DisasContext *ctx, int *is_branc
int rb = mmreg(uMIPS_RS(ctx->opcode));
int16_t offset = ZIMM(ctx->opcode, 0, 4) << 1;
gen_ld(ctx, OPC_LHU, rd, rb, offset);
gen_ld(env, ctx, OPC_LHU, rd, rb, offset);
}
break;
case LWSP16:
@ -11187,7 +11195,7 @@ static int decode_micromips_opc (CPUState *env, DisasContext *ctx, int *is_branc
int rb = 29; /* SP */
int16_t offset = ZIMM(ctx->opcode, 0, 5) << 2;
gen_ld(ctx, OPC_LW, rd, rb, offset);
gen_ld(env, ctx, OPC_LW, rd, rb, offset);
}
break;
case LW16:
@ -11196,7 +11204,7 @@ static int decode_micromips_opc (CPUState *env, DisasContext *ctx, int *is_branc
int rb = mmreg(uMIPS_RS(ctx->opcode));
int16_t offset = ZIMM(ctx->opcode, 0, 4) << 2;
gen_ld(ctx, OPC_LW, rd, rb, offset);
gen_ld(env, ctx, OPC_LW, rd, rb, offset);
}
break;
case SB16:
@ -11798,7 +11806,7 @@ static void decode_opc (CPUState *env, DisasContext *ctx, int *is_branch)
break;
case OPC_LB ... OPC_LWR: /* Load and stores */
case OPC_LL:
gen_ld(ctx, op, rt, rs, imm);
gen_ld(env, ctx, op, rt, rs, imm);
break;
case OPC_SB ... OPC_SW:
case OPC_SWR:
@ -11932,7 +11940,7 @@ static void decode_opc (CPUState *env, DisasContext *ctx, int *is_branch)
case OPC_LD:
check_insn(env, ctx, ISA_MIPS3);
check_mips_64(ctx);
gen_ld(ctx, op, rt, rs, imm);
gen_ld(env, ctx, op, rt, rs, imm);
break;
case OPC_SDL ... OPC_SDR:
case OPC_SD: