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X-Received-From: 2607:f8b0:4864:20::62c Subject: [Qemu-devel] [PATCH v2 39/68] target/arm: Convert Table Branch X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, qemu-arm@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Signed-off-by: Richard Henderson Reviewed-by: Peter Maydell --- target/arm/translate.c | 57 +++++++++++++++++++++++++----------------- target/arm/t32.decode | 8 +++++- 2 files changed, 41 insertions(+), 24 deletions(-) diff --git a/target/arm/translate.c b/target/arm/translate.c index 9ec6b25c03..7c05e7006e 100644 --- a/target/arm/translate.c +++ b/target/arm/translate.c @@ -9968,6 +9968,37 @@ static bool trans_BLX_i(DisasContext *s, arg_BLX_i *= a) return true; } =20 +static bool op_tbranch(DisasContext *s, arg_tbranch *a, bool half) +{ + TCGv_i32 addr, tmp; + + tmp =3D load_reg(s, a->rm); + if (half) { + tcg_gen_add_i32(tmp, tmp, tmp); + } + addr =3D load_reg(s, a->rn); + tcg_gen_add_i32(addr, addr, tmp); + + gen_aa32_ld_i32(s, tmp, addr, get_mem_index(s), + half ? MO_UW | s->be_data : MO_UB); + tcg_temp_free_i32(addr); + + tcg_gen_add_i32(tmp, tmp, tmp); + tcg_gen_addi_i32(tmp, tmp, read_pc(s)); + store_reg(s, 15, tmp); + return true; +} + +static bool trans_TBB(DisasContext *s, arg_tbranch *a) +{ + return op_tbranch(s, a, false); +} + +static bool trans_TBH(DisasContext *s, arg_tbranch *a) +{ + return op_tbranch(s, a, true); +} + /* * Supervisor call */ @@ -10350,9 +10381,7 @@ static bool thumb_insn_is_16bit(DisasContext *s, ui= nt32_t pc, uint32_t insn) /* Translate a 32-bit thumb instruction. */ static void disas_thumb2_insn(DisasContext *s, uint32_t insn) { - uint32_t rd, rn, rm, rs; - TCGv_i32 tmp; - TCGv_i32 addr; + uint32_t rd, rn, rs; int op; =20 /* @@ -10398,7 +10427,6 @@ static void disas_thumb2_insn(DisasContext *s, uint= 32_t insn) rn =3D (insn >> 16) & 0xf; rs =3D (insn >> 12) & 0xf; rd =3D (insn >> 8) & 0xf; - rm =3D insn & 0xf; switch ((insn >> 25) & 0xf) { case 0: case 1: case 2: case 3: /* 16-bit instructions. Should never happen. */ @@ -10471,25 +10499,8 @@ static void disas_thumb2_insn(DisasContext *s, uin= t32_t insn) /* Load/store exclusive, in decodetree */ goto illegal_op; } else if ((insn & (7 << 5)) =3D=3D 0) { - /* Table Branch. */ - addr =3D load_reg(s, rn); - tmp =3D load_reg(s, rm); - tcg_gen_add_i32(addr, addr, tmp); - if (insn & (1 << 4)) { - /* tbh */ - tcg_gen_add_i32(addr, addr, tmp); - tcg_temp_free_i32(tmp); - tmp =3D tcg_temp_new_i32(); - gen_aa32_ld16u(s, tmp, addr, get_mem_index(s)); - } else { /* tbb */ - tcg_temp_free_i32(tmp); - tmp =3D tcg_temp_new_i32(); - gen_aa32_ld8u(s, tmp, addr, get_mem_index(s)); - } - tcg_temp_free_i32(addr); - tcg_gen_shli_i32(tmp, tmp, 1); - tcg_gen_addi_i32(tmp, tmp, read_pc(s)); - store_reg(s, 15, tmp); + /* Table Branch, in decodetree */ + goto illegal_op; } else { /* Load/store exclusive, load-acq/store-rel, in decodetree= */ goto illegal_op; diff --git a/target/arm/t32.decode b/target/arm/t32.decode index 354ad77fe6..0cc0808c05 100644 --- a/target/arm/t32.decode +++ b/target/arm/t32.decode @@ -487,7 +487,7 @@ LDRD_ri_t32 1110 1001 .101 .... .... .... ........= @ldstd_ri8 w=3D0 p=3D1 STRD_ri_t32 1110 1001 .110 .... .... .... ........ @ldstd_ri8 w=3D= 1 p=3D1 LDRD_ri_t32 1110 1001 .111 .... .... .... ........ @ldstd_ri8 w=3D= 1 p=3D1 =20 -# Load/Store Exclusive and Load-Acquire/Store-Release +# Load/Store Exclusive, Load-Acquire/Store-Release, and Table Branch =20 @strex_i .... .... .... rn:4 rt:4 rd:4 .... .... \ &strex rt2=3D15 imm=3D%imm8x4 @@ -531,6 +531,12 @@ LDA 1110 1000 1101 .... .... 1111 1010 11= 11 @ldrex_0 LDAB 1110 1000 1101 .... .... 1111 1000 1111 @ldrex_0 LDAH 1110 1000 1101 .... .... 1111 1001 1111 @ldrex_0 =20 +&tbranch rn rm +@tbranch .... .... .... rn:4 .... .... .... rm:4 &tbranch + +TBB 1110 1000 1101 .... 1111 0000 0000 .... @tbranch +TBH 1110 1000 1101 .... 1111 0000 0001 .... @tbranch + # Parallel addition and subtraction =20 SADD8 1111 1010 1000 .... 1111 .... 0000 .... @rndm --=20 2.17.1