diff options
Diffstat (limited to 'target-arm/translate-a64.c')
| -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 4eb2992754..1d04303980 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) |