diff options
Diffstat (limited to 'target/m68k/translate.c')
-rw-r--r-- | target/m68k/translate.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/target/m68k/translate.c b/target/m68k/translate.c index 53293173c5..148791481b 100644 --- a/target/m68k/translate.c +++ b/target/m68k/translate.c @@ -3504,6 +3504,210 @@ DISAS_INSN(rotate_mem) set_cc_op(s, CC_OP_FLAGS); } +DISAS_INSN(bfext_reg) +{ + int ext = read_im16(env, s); + int is_sign = insn & 0x200; + TCGv src = DREG(insn, 0); + TCGv dst = DREG(ext, 12); + int len = ((extract32(ext, 0, 5) - 1) & 31) + 1; + int ofs = extract32(ext, 6, 5); /* big bit-endian */ + int pos = 32 - ofs - len; /* little bit-endian */ + TCGv tmp = tcg_temp_new(); + TCGv shift; + + /* In general, we're going to rotate the field so that it's at the + top of the word and then right-shift by the compliment of the + width to extend the field. */ + if (ext & 0x20) { + /* Variable width. */ + if (ext & 0x800) { + /* Variable offset. */ + tcg_gen_andi_i32(tmp, DREG(ext, 6), 31); + tcg_gen_rotl_i32(tmp, src, tmp); + } else { + tcg_gen_rotli_i32(tmp, src, ofs); + } + + shift = tcg_temp_new(); + tcg_gen_neg_i32(shift, DREG(ext, 0)); + tcg_gen_andi_i32(shift, shift, 31); + tcg_gen_sar_i32(QREG_CC_N, tmp, shift); + if (is_sign) { + tcg_gen_mov_i32(dst, QREG_CC_N); + } else { + tcg_gen_shr_i32(dst, tmp, shift); + } + tcg_temp_free(shift); + } else { + /* Immediate width. */ + if (ext & 0x800) { + /* Variable offset */ + tcg_gen_andi_i32(tmp, DREG(ext, 6), 31); + tcg_gen_rotl_i32(tmp, src, tmp); + src = tmp; + pos = 32 - len; + } else { + /* Immediate offset. If the field doesn't wrap around the + end of the word, rely on (s)extract completely. */ + if (pos < 0) { + tcg_gen_rotli_i32(tmp, src, ofs); + src = tmp; + pos = 32 - len; + } + } + + tcg_gen_sextract_i32(QREG_CC_N, src, pos, len); + if (is_sign) { + tcg_gen_mov_i32(dst, QREG_CC_N); + } else { + tcg_gen_extract_i32(dst, src, pos, len); + } + } + + tcg_temp_free(tmp); + set_cc_op(s, CC_OP_LOGIC); +} + +DISAS_INSN(bfop_reg) +{ + int ext = read_im16(env, s); + 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; + + if ((ext & 0x820) == 0) { + /* Immediate width and offset. */ + uint32_t maski = 0x7fffffffu >> (len - 1); + if (ofs + len <= 32) { + tcg_gen_shli_i32(QREG_CC_N, src, ofs); + } else { + tcg_gen_rotli_i32(QREG_CC_N, src, ofs); + } + tcg_gen_andi_i32(QREG_CC_N, QREG_CC_N, ~maski); + mask = tcg_const_i32(ror32(maski, ofs)); + } else { + TCGv tmp = tcg_temp_new(); + if (ext & 0x20) { + /* Variable width */ + tcg_gen_subi_i32(tmp, DREG(ext, 0), 1); + tcg_gen_andi_i32(tmp, tmp, 31); + mask = tcg_const_i32(0x7fffffffu); + tcg_gen_shr_i32(mask, mask, tmp); + } else { + /* Immediate width */ + mask = tcg_const_i32(0x7fffffffu >> (len - 1)); + } + if (ext & 0x800) { + /* Variable offset */ + tcg_gen_andi_i32(tmp, DREG(ext, 6), 31); + 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); + } 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); + } + tcg_temp_free(tmp); + } + set_cc_op(s, CC_OP_LOGIC); + + switch (insn & 0x0f00) { + case 0x0a00: /* bfchg */ + tcg_gen_eqv_i32(src, src, mask); + break; + case 0x0c00: /* bfclr */ + tcg_gen_and_i32(src, src, mask); + break; + case 0x0e00: /* bfset */ + tcg_gen_orc_i32(src, src, mask); + break; + case 0x0800: /* bftst */ + /* flags already set; no other work to do. */ + break; + default: + g_assert_not_reached(); + } + tcg_temp_free(mask); +} + +DISAS_INSN(bfins_reg) +{ + int ext = read_im16(env, s); + TCGv dst = DREG(insn, 0); + TCGv src = DREG(ext, 12); + int len = ((extract32(ext, 0, 5) - 1) & 31) + 1; + int ofs = extract32(ext, 6, 5); /* big bit-endian */ + int pos = 32 - ofs - len; /* little bit-endian */ + TCGv tmp; + + tmp = tcg_temp_new(); + + if (ext & 0x20) { + /* Variable width */ + tcg_gen_neg_i32(tmp, DREG(ext, 0)); + tcg_gen_andi_i32(tmp, tmp, 31); + tcg_gen_shl_i32(QREG_CC_N, src, tmp); + } else { + /* Immediate width */ + tcg_gen_shli_i32(QREG_CC_N, src, 32 - len); + } + set_cc_op(s, CC_OP_LOGIC); + + /* Immediate width and offset */ + if ((ext & 0x820) == 0) { + /* Check for suitability for deposit. */ + if (pos >= 0) { + tcg_gen_deposit_i32(dst, dst, src, pos, len); + } else { + uint32_t maski = -2U << (len - 1); + uint32_t roti = (ofs + len) & 31; + tcg_gen_andi_i32(tmp, src, ~maski); + tcg_gen_rotri_i32(tmp, tmp, roti); + tcg_gen_andi_i32(dst, dst, ror32(maski, roti)); + tcg_gen_or_i32(dst, dst, tmp); + } + } else { + TCGv mask = tcg_temp_new(); + TCGv rot = tcg_temp_new(); + + if (ext & 0x20) { + /* Variable width */ + tcg_gen_subi_i32(rot, DREG(ext, 0), 1); + tcg_gen_andi_i32(rot, rot, 31); + tcg_gen_movi_i32(mask, -2); + tcg_gen_shl_i32(mask, mask, rot); + tcg_gen_mov_i32(rot, DREG(ext, 0)); + tcg_gen_andc_i32(tmp, src, mask); + } else { + /* Immediate width (variable offset) */ + uint32_t maski = -2U << (len - 1); + tcg_gen_andi_i32(tmp, src, ~maski); + tcg_gen_movi_i32(mask, maski); + tcg_gen_movi_i32(rot, len & 31); + } + if (ext & 0x800) { + /* Variable offset */ + tcg_gen_add_i32(rot, rot, DREG(ext, 6)); + } else { + /* Immediate offset (variable width) */ + tcg_gen_addi_i32(rot, rot, ofs); + } + tcg_gen_andi_i32(rot, rot, 31); + tcg_gen_rotr_i32(mask, mask, rot); + tcg_gen_rotr_i32(tmp, tmp, rot); + tcg_gen_and_i32(dst, dst, mask); + tcg_gen_or_i32(dst, dst, tmp); + + tcg_temp_free(rot); + tcg_temp_free(mask); + } + tcg_temp_free(tmp); +} + DISAS_INSN(ff1) { TCGv reg; @@ -4595,6 +4799,12 @@ void register_m68k_insns (CPUM68KState *env) INSN(rotate8_reg, e030, f0f0, M68000); INSN(rotate16_reg, e070, f0f0, M68000); INSN(rotate_mem, e4c0, fcc0, M68000); + INSN(bfext_reg, e9c0, fdf8, BITFIELD); /* bfextu & bfexts */ + INSN(bfins_reg, efc0, fff8, BITFIELD); + INSN(bfop_reg, eac0, fff8, BITFIELD); /* bfchg */ + INSN(bfop_reg, ecc0, fff8, BITFIELD); /* bfclr */ + INSN(bfop_reg, eec0, fff8, BITFIELD); /* bfset */ + INSN(bfop_reg, e8c0, fff8, BITFIELD); /* bftst */ INSN(undef_fpu, f000, f000, CF_ISA_A); INSN(fpu, f200, ffc0, CF_FPU); INSN(fbcc, f280, ffc0, CF_FPU); |