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Tue, 17 Mar 2026 10:48:05 -0700 (PDT) From: Lucas Amaral To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, agraf@csgraf.de, peter.maydell@linaro.org, mohamed@unpredictable.fr, alex.bennee@linaro.org, Lucas Amaral Subject: [PATCH v5 2/6] target/arm/emulate: add load/store register offset Date: Tue, 17 Mar 2026 14:47:36 -0300 Message-ID: <20260317174740.31674-3-lucaaamaral@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260317174740.31674-1-lucaaamaral@gmail.com> References: <20260317174740.31674-1-lucaaamaral@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::122f; envelope-from=lucaaamaral@gmail.com; helo=mail-dl1-x122f.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1773769843345154100 Add emulation for load/store register offset addressing mode (DDI 0487 C3.3.9). The offset register value is extended via UXTB/UXTH/UXTW/UXTX/SXTB/SXTH/SXTW/SXTX and optionally shifted by the element size. Instruction coverage: - STR/LDR (GPR): register offset with extend, all sizes - STR/LDR (SIMD/FP): register offset with extend, 8-128 bit - PRFM register offset: NOP Signed-off-by: Lucas Amaral --- target/arm/emulate/a64-ldst.decode | 29 ++++++++ target/arm/emulate/arm_emulate.c | 103 +++++++++++++++++++++++++++++ 2 files changed, 132 insertions(+) diff --git a/target/arm/emulate/a64-ldst.decode b/target/arm/emulate/a64-ld= st.decode index c887dcba..af6babe1 100644 --- a/target/arm/emulate/a64-ldst.decode +++ b/target/arm/emulate/a64-ldst.decode @@ -10,6 +10,9 @@ # 'u' flag: 0 =3D 9-bit signed immediate (byte offset), 1 =3D 12-bit unsig= ned (needs << sz) &ldst_imm rt rn imm sz sign w p unpriv ext u =20 +# Load/store register offset +&ldst rm rn rt sign ext sz opt s + ### Format templates =20 # Load/store immediate (9-bit signed) @@ -21,6 +24,9 @@ # Load/store unsigned offset (12-bit, handler scales by << sz) @ldst_uimm .. ... . .. .. imm:12 rn:5 rt:5 &ldst_imm u=3D1 unp= riv=3D0 p=3D0 w=3D0 =20 +# Load/store register offset +@ldst .. ... . .. .. . rm:5 opt:3 s:1 .. rn:5 rt:5 &ldst + ### Load/store register =E2=80=94 unscaled immediate (LDUR/STUR) =20 # GPR @@ -122,6 +128,29 @@ STR_v_i 00 111 1 01 10 ............ ..... ....= . @ldst_uimm sign=3D LDR_v_i sz:2 111 1 01 01 ............ ..... ..... @ldst_uimm= sign=3D0 ext=3D0 LDR_v_i 00 111 1 01 11 ............ ..... ..... @ldst_uimm= sign=3D0 ext=3D0 sz=3D4 =20 +### Load/store register =E2=80=94 register offset + +# GPR +STR sz:2 111 0 00 00 1 ..... ... . 10 ..... ..... @ldst sign= =3D0 ext=3D0 +LDR 00 111 0 00 01 1 ..... ... . 10 ..... ..... @ldst sign= =3D0 ext=3D1 sz=3D0 +LDR 01 111 0 00 01 1 ..... ... . 10 ..... ..... @ldst sign= =3D0 ext=3D1 sz=3D1 +LDR 10 111 0 00 01 1 ..... ... . 10 ..... ..... @ldst sign= =3D0 ext=3D1 sz=3D2 +LDR 11 111 0 00 01 1 ..... ... . 10 ..... ..... @ldst sign= =3D0 ext=3D0 sz=3D3 +LDR 00 111 0 00 10 1 ..... ... . 10 ..... ..... @ldst sign= =3D1 ext=3D0 sz=3D0 +LDR 01 111 0 00 10 1 ..... ... . 10 ..... ..... @ldst sign= =3D1 ext=3D0 sz=3D1 +LDR 10 111 0 00 10 1 ..... ... . 10 ..... ..... @ldst sign= =3D1 ext=3D0 sz=3D2 +LDR 00 111 0 00 11 1 ..... ... . 10 ..... ..... @ldst sign= =3D1 ext=3D1 sz=3D0 +LDR 01 111 0 00 11 1 ..... ... . 10 ..... ..... @ldst sign= =3D1 ext=3D1 sz=3D1 + +# PRFM =E2=80=94 register offset +NOP 11 111 0 00 10 1 ----- -1- - 10 ----- ----- + +# SIMD/FP +STR_v sz:2 111 1 00 00 1 ..... ... . 10 ..... ..... @ldst sign= =3D0 ext=3D0 +STR_v 00 111 1 00 10 1 ..... ... . 10 ..... ..... @ldst sign= =3D0 ext=3D0 sz=3D4 +LDR_v sz:2 111 1 00 01 1 ..... ... . 10 ..... ..... @ldst sign= =3D0 ext=3D0 +LDR_v 00 111 1 00 11 1 ..... ... . 10 ..... ..... @ldst sign= =3D0 ext=3D0 sz=3D4 + ### System instructions =E2=80=94 DC cache maintenance =20 # SYS with CRn=3DC7 covers all data cache operations (DC CIVAC, CVAC, etc.= ). diff --git a/target/arm/emulate/arm_emulate.c b/target/arm/emulate/arm_emul= ate.c index 02fefc30..bf09e2a6 100644 --- a/target/arm/emulate/arm_emulate.c +++ b/target/arm/emulate/arm_emulate.c @@ -211,6 +211,109 @@ static bool trans_LDR_v_i(DisasContext *ctx, arg_ldst= _imm *a) return true; } =20 +/* Register offset extension (DDI 0487 C6.2.131) */ + +static uint64_t extend_reg(uint64_t val, int option, int shift) +{ + switch (option) { + case 0: /* UXTB */ + val =3D (uint8_t)val; + break; + case 1: /* UXTH */ + val =3D (uint16_t)val; + break; + case 2: /* UXTW */ + val =3D (uint32_t)val; + break; + case 3: /* UXTX / LSL */ + break; + case 4: /* SXTB */ + val =3D (int64_t)(int8_t)val; + break; + case 5: /* SXTH */ + val =3D (int64_t)(int16_t)val; + break; + case 6: /* SXTW */ + val =3D (int64_t)(int32_t)val; + break; + case 7: /* SXTX */ + break; + } + return val << shift; +} + +/* + * Load/store single -- register offset (GPR) + * STR / LDR (DDI 0487 C3.3.9) + */ + +static bool trans_STR(DisasContext *ctx, arg_ldst *a) +{ + int esize =3D (a->sz <=3D 3) ? (1 << a->sz) : 16; + int shift =3D a->s ? a->sz : 0; + uint64_t rm_val =3D gpr_read(ctx, a->rm); + uint64_t offset =3D extend_reg(rm_val, a->opt, shift); + uint64_t va =3D base_read(ctx, a->rn) + offset; + + uint64_t val =3D gpr_read(ctx, a->rt); + mem_write(ctx, va, &val, esize); + return true; +} + +static bool trans_LDR(DisasContext *ctx, arg_ldst *a) +{ + int esize =3D (a->sz <=3D 3) ? (1 << a->sz) : 16; + int shift =3D a->s ? a->sz : 0; + uint64_t rm_val =3D gpr_read(ctx, a->rm); + uint64_t offset =3D extend_reg(rm_val, a->opt, shift); + uint64_t va =3D base_read(ctx, a->rn) + offset; + uint64_t val =3D 0; + + if (mem_read(ctx, va, &val, esize) !=3D 0) { + return true; + } + + val =3D load_extend(val, a->sz, a->sign, a->ext); + gpr_write(ctx, a->rt, val); + return true; +} + +/* + * Load/store single -- register offset (SIMD/FP) + * STR_v / LDR_v (DDI 0487 C3.3.10) + */ + +static bool trans_STR_v(DisasContext *ctx, arg_ldst *a) +{ + int esize =3D (a->sz <=3D 3) ? (1 << a->sz) : 16; + int shift =3D a->s ? a->sz : 0; + uint64_t rm_val =3D gpr_read(ctx, a->rm); + uint64_t offset =3D extend_reg(rm_val, a->opt, shift); + uint64_t va =3D base_read(ctx, a->rn) + offset; + uint8_t buf[16]; + + fpreg_read(ctx, a->rt, buf, esize); + mem_write(ctx, va, buf, esize); + return true; +} + +static bool trans_LDR_v(DisasContext *ctx, arg_ldst *a) +{ + int esize =3D (a->sz <=3D 3) ? (1 << a->sz) : 16; + int shift =3D a->s ? a->sz : 0; + uint64_t rm_val =3D gpr_read(ctx, a->rm); + uint64_t offset =3D extend_reg(rm_val, a->opt, shift); + uint64_t va =3D base_read(ctx, a->rn) + offset; + uint8_t buf[16]; + + if (mem_read(ctx, va, buf, esize) !=3D 0) { + return true; + } + + fpreg_write(ctx, a->rt, buf, esize); + return true; +} + /* PRFM, DC cache maintenance -- treated as NOP */ static bool trans_NOP(DisasContext *ctx, arg_NOP *a) { --=20 2.52.0