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X-Received-From: 2607:f8b0:4864:20::643 Subject: [Qemu-devel] [PATCH v3 53/69] target/arm: Convert T16 branch and exchange 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" Reviewed-by: Peter Maydell Signed-off-by: Richard Henderson --- target/arm/translate.c | 70 +++++++++++++++++------------------------- target/arm/t16.decode | 10 ++++++ 2 files changed, 39 insertions(+), 41 deletions(-) diff --git a/target/arm/translate.c b/target/arm/translate.c index d4d7d99da8..cd39329e5c 100644 --- a/target/arm/translate.c +++ b/target/arm/translate.c @@ -8338,7 +8338,7 @@ static bool trans_BX(DisasContext *s, arg_BX *a) if (!ENABLE_ARCH_4T) { return false; } - gen_bx(s, load_reg(s, a->rm)); + gen_bx_excret(s, load_reg(s, a->rm)); return true; } =20 @@ -8365,6 +8365,32 @@ static bool trans_BLX_r(DisasContext *s, arg_BLX_r *= a) return true; } =20 +/* + * BXNS/BLXNS: only exist for v8M with the security extensions, + * and always UNDEF if NonSecure. We don't implement these in + * the user-only mode either (in theory you can use them from + * Secure User mode but they are too tied in to system emulation). + */ +static bool trans_BXNS(DisasContext *s, arg_BXNS *a) +{ + if (!s->v8m_secure || IS_USER_ONLY) { + unallocated_encoding(s); + } else { + gen_bxns(s, a->rm); + } + return true; +} + +static bool trans_BLXNS(DisasContext *s, arg_BLXNS *a) +{ + if (!s->v8m_secure || IS_USER_ONLY) { + unallocated_encoding(s); + } else { + gen_blxns(s, a->rm); + } + return true; +} + static bool trans_CLZ(DisasContext *s, arg_CLZ *a) { TCGv_i32 tmp; @@ -10733,49 +10759,11 @@ static void disas_thumb_insn(DisasContext *s, uin= t32_t insn) } break; case 3: - { /* 0b0100_0111_xxxx_xxxx * - branch [and link] exchange thumb register + * In decodetree */ - bool link =3D insn & (1 << 7); - - if (insn & 3) { - goto undef; - } - if (link) { - ARCH(5); - } - if ((insn & 4)) { - /* BXNS/BLXNS: only exists for v8M with the - * security extensions, and always UNDEF if NonSecure. - * We don't implement these in the user-only mode - * either (in theory you can use them from Secure User - * mode but they are too tied in to system emulation.) - */ - if (!s->v8m_secure || IS_USER_ONLY) { - goto undef; - } - if (link) { - gen_blxns(s, rm); - } else { - gen_bxns(s, rm); - } - break; - } - /* BLX/BX */ - tmp =3D load_reg(s, rm); - if (link) { - val =3D (uint32_t)s->base.pc_next | 1; - tmp2 =3D tcg_temp_new_i32(); - tcg_gen_movi_i32(tmp2, val); - store_reg(s, 14, tmp2); - gen_bx(s, tmp); - } else { - /* Only BX works as exception-return, not BLX */ - gen_bx_excret(s, tmp); - } - break; - } + goto illegal_op; } break; } diff --git a/target/arm/t16.decode b/target/arm/t16.decode index 0654275e68..edddbfb9b8 100644 --- a/target/arm/t16.decode +++ b/target/arm/t16.decode @@ -24,6 +24,7 @@ &s_rri_rot !extern s rn rd imm rot &s_rrrr !extern s rd rn rm ra &ri !extern rd imm +&r !extern rm &ldst_rr !extern p w u rn rt rm shimm shtype &ldst_ri !extern p w u rn rt imm &ldst_block !extern rn i b u w list @@ -144,3 +145,12 @@ MOV_rxi 00100 ... ........ @arith= _1i %s CMP_xri 00101 ... ........ @arith_1i s=3D1 ADD_rri 00110 ... ........ @arith_1i %s SUB_rri 00111 ... ........ @arith_1i %s + +# Branch and exchange + +@branchr .... .... . rm:4 ... &r + +BX 0100 0111 0 .... 000 @branchr +BLX_r 0100 0111 1 .... 000 @branchr +BXNS 0100 0111 0 .... 100 @branchr +BLXNS 0100 0111 1 .... 100 @branchr --=20 2.17.1