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target-m68k: Implement bfffo

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Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-Id: <1479242669-25852-1-git-send-email-rth@twiddle.net>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2016-11-15 21:44:29 +01:00 • committed by Laurent Vivier
parent f2224f2c9a
commit a45f1763cc
3 changed files with 62 additions and 1 deletions
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39
target/m68k/translate.c
View file

@ -3625,7 +3625,14 @@ DISAS_INSN(bfop_reg)
TCGv src = DREG(insn, 0);
int len = ((extract32(ext, 0, 5) - 1) & 31) + 1;
int ofs = extract32(ext, 6, 5); /* big bit-endian */
TCGv mask;
TCGv mask, tofs, tlen;
TCGV_UNUSED(tofs);
TCGV_UNUSED(tlen);
if ((insn & 0x0f00) == 0x0d00) { /* bfffo */
tofs = tcg_temp_new();
tlen = tcg_temp_new();
}
if ((ext & 0x820) == 0) {
/* Immediate width and offset. */
@ -3637,6 +3644,10 @@ DISAS_INSN(bfop_reg)
}
tcg_gen_andi_i32(QREG_CC_N, QREG_CC_N, ~maski);
mask = tcg_const_i32(ror32(maski, ofs));
if (!TCGV_IS_UNUSED(tofs)) {
tcg_gen_movi_i32(tofs, ofs);
tcg_gen_movi_i32(tlen, len);
}
} else {
TCGv tmp = tcg_temp_new();
if (ext & 0x20) {
@ -3645,9 +3656,15 @@ DISAS_INSN(bfop_reg)
tcg_gen_andi_i32(tmp, tmp, 31);
mask = tcg_const_i32(0x7fffffffu);
tcg_gen_shr_i32(mask, mask, tmp);
if (!TCGV_IS_UNUSED(tlen)) {
tcg_gen_addi_i32(tlen, tmp, 1);
}
} else {
/* Immediate width */
mask = tcg_const_i32(0x7fffffffu >> (len - 1));
if (!TCGV_IS_UNUSED(tlen)) {
tcg_gen_movi_i32(tlen, len);
}
}
if (ext & 0x800) {
/* Variable offset */
@ -3655,11 +3672,17 @@ DISAS_INSN(bfop_reg)
tcg_gen_rotl_i32(QREG_CC_N, src, tmp);
tcg_gen_andc_i32(QREG_CC_N, QREG_CC_N, mask);
tcg_gen_rotr_i32(mask, mask, tmp);
if (!TCGV_IS_UNUSED(tofs)) {
tcg_gen_mov_i32(tofs, tmp);
}
} else {
/* Immediate offset (and variable width) */
tcg_gen_rotli_i32(QREG_CC_N, src, ofs);
tcg_gen_andc_i32(QREG_CC_N, QREG_CC_N, mask);
tcg_gen_rotri_i32(mask, mask, ofs);
if (!TCGV_IS_UNUSED(tofs)) {
tcg_gen_movi_i32(tofs, ofs);
}
}
tcg_temp_free(tmp);
}
@ -3672,6 +3695,11 @@ DISAS_INSN(bfop_reg)
case 0x0c00: /* bfclr */
tcg_gen_and_i32(src, src, mask);
break;
case 0x0d00: /* bfffo */
gen_helper_bfffo_reg(DREG(ext, 12), QREG_CC_N, tofs, tlen);
tcg_temp_free(tlen);
tcg_temp_free(tofs);
break;
case 0x0e00: /* bfset */
tcg_gen_orc_i32(src, src, mask);
break;
@ -3688,6 +3716,7 @@ DISAS_INSN(bfop_mem)
{
int ext = read_im16(env, s);
TCGv addr, len, ofs;
TCGv_i64 t64;
addr = gen_lea(env, s, insn, OS_UNSIZED);
if (IS_NULL_QREG(addr)) {
@ -3713,6 +3742,12 @@ DISAS_INSN(bfop_mem)
case 0x0c00: /* bfclr */
gen_helper_bfclr_mem(QREG_CC_N, cpu_env, addr, ofs, len);
break;
case 0x0d00: /* bfffo */
t64 = tcg_temp_new_i64();
gen_helper_bfffo_mem(t64, cpu_env, addr, ofs, len);
tcg_gen_extr_i64_i32(DREG(ext, 12), QREG_CC_N, t64);
tcg_temp_free_i64(t64);
break;
case 0x0e00: /* bfset */
gen_helper_bfset_mem(QREG_CC_N, cpu_env, addr, ofs, len);
break;
@ -4939,6 +4974,8 @@ void register_m68k_insns (CPUM68KState *env)
INSN(bfop_reg, eac0, fff8, BITFIELD); /* bfchg */
INSN(bfop_mem, ecc0, ffc0, BITFIELD); /* bfclr */
INSN(bfop_reg, ecc0, fff8, BITFIELD); /* bfclr */
INSN(bfop_mem, edc0, ffc0, BITFIELD); /* bfffo */
INSN(bfop_reg, edc0, fff8, BITFIELD); /* bfffo */
INSN(bfop_mem, eec0, ffc0, BITFIELD); /* bfset */
INSN(bfop_reg, eec0, fff8, BITFIELD); /* bfset */
INSN(bfop_mem, e8c0, ffc0, BITFIELD); /* bftst */