diff options
| author | Alexander Graf <agraf@suse.de> | 2013-12-03 15:12:19 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2013-12-05 21:29:13 +0000 |
| commit | fbd45b14e4cdcbd1235ac91318d090a5fdac7848 (patch) | |
| tree | f61e095fc42a101d97691ba6e33927488cd5dbcf | |
| parent | 23f0e4df3def8cad9eb4dbfe40aa514726293684 (diff) | |
target-arm: A64: add support for 'test and branch' imm
This patch adds emulation for the test and branch insns,
TBZ and TBNZ.
Signed-off-by: Alexander Graf <agraf@suse.de>
[claudio:
adapted for new decoder
always compare with 0
remove a TCG temporary
]
Signed-off-by: Claudio Fontana <claudio.fontana@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
| -rw-r--r-- | target-arm/translate-a64.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c index a6a1973dd7..213a98a152 100644 --- a/target-arm/translate-a64.c +++ b/target-arm/translate-a64.c @@ -233,10 +233,33 @@ static void disas_comp_b_imm(DisasContext *s, uint32_t insn) unsupported_encoding(s, insn); } -/* Test & branch (immediate) */ +/* C3.2.5 Test & branch (immediate) + * 31 30 25 24 23 19 18 5 4 0 + * +----+-------------+----+-------+-------------+------+ + * | b5 | 0 1 1 0 1 1 | op | b40 | imm14 | Rt | + * +----+-------------+----+-------+-------------+------+ + */ static void disas_test_b_imm(DisasContext *s, uint32_t insn) { - unsupported_encoding(s, insn); + unsigned int bit_pos, op, rt; + uint64_t addr; + int label_match; + TCGv_i64 tcg_cmp; + + bit_pos = (extract32(insn, 31, 1) << 5) | extract32(insn, 19, 5); + op = extract32(insn, 24, 1); /* 0: TBZ; 1: TBNZ */ + addr = s->pc + sextract32(insn, 5, 14) * 4 - 4; + rt = extract32(insn, 0, 5); + + tcg_cmp = tcg_temp_new_i64(); + tcg_gen_andi_i64(tcg_cmp, cpu_reg(s, rt), (1ULL << bit_pos)); + label_match = gen_new_label(); + tcg_gen_brcondi_i64(op ? TCG_COND_NE : TCG_COND_EQ, + tcg_cmp, 0, label_match); + tcg_temp_free_i64(tcg_cmp); + gen_goto_tb(s, 0, s->pc); + gen_set_label(label_match); + gen_goto_tb(s, 1, addr); } /* C3.2.2 / C5.6.19 Conditional branch (immediate) |