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helo=lists.xenproject.org; Received-SPF: Pass (protection.outlook.com: domain of xilinx.com designates 149.199.80.198 as permitted sender) receiver=protection.outlook.com; client-ip=149.199.80.198; helo=xir-pvapexch01.xlnx.xilinx.com; From: Ayan Kumar Halder To: CC: , , , , , , Subject: [RFC PATCH] Added the logic to decode 32 bit ldr/str post-indexing instructions Date: Fri, 19 Nov 2021 16:52:02 +0000 Message-ID: <20211119165202.42442-1-ayankuma@xilinx.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 6dc964f8-cacf-4309-c5c6-08d9ab7cf5d8 X-MS-TrafficTypeDiagnostic: SA2PR02MB7628: X-Microsoft-Antispam-PRVS: X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply X-MS-Oob-TLC-OOBClassifiers: OLM:9508; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:149.199.80.198;CTRY:IE;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:xir-pvapexch01.xlnx.xilinx.com;PTR:unknown-80-198.xilinx.com;CAT:NONE;SFS:(36840700001)(46966006)(1076003)(316002)(36906005)(426003)(54906003)(186003)(336012)(36756003)(2906002)(2616005)(70206006)(36860700001)(6916009)(82310400003)(70586007)(107886003)(26005)(4326008)(9786002)(7696005)(8936002)(966005)(6666004)(5660300002)(508600001)(83380400001)(8676002)(7636003)(47076005)(356005)(102446001);DIR:OUT;SFP:1101; X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Nov 2021 16:52:23.5755 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6dc964f8-cacf-4309-c5c6-08d9ab7cf5d8 X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.80.198];Helo=[xir-pvapexch01.xlnx.xilinx.com] X-MS-Exchange-CrossTenant-AuthSource: SN1NAM02FT0015.eop-nam02.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA2PR02MB7628 X-ZohoMail-DKIM: pass (identity @xilinx.onmicrosoft.com) X-ZM-MESSAGEID: 1637340779784100001 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" At present, post indexing instructions are not emulated by Xen. When Xen gets the exception, EL2_ESR.ISV bit not set. Thus as a result, data abort is triggered. Added the logic to decode ldr/str post indexing instructions. With this, Xen can decode instructions like these:- ldr w2, [x1], #4 Thus, domU can read ioreg with post indexing instructions. Signed-off-by: Ayan Kumar Halder --- Note to reviewer:- This patch is based on an issue discussed in=20 https://lists.xenproject.org/archives/html/xen-devel/2021-11/msg00969.html "Xen/ARM - Query about a data abort seen while reading GICD registers" xen/arch/arm/decode.c | 77 +++++++++++++++++++++++++++++++++++++++++++ xen/arch/arm/io.c | 14 ++++++-- 2 files changed, 88 insertions(+), 3 deletions(-) diff --git a/xen/arch/arm/decode.c b/xen/arch/arm/decode.c index 792c2e92a7..7b60bedbc5 100644 --- a/xen/arch/arm/decode.c +++ b/xen/arch/arm/decode.c @@ -84,6 +84,80 @@ bad_thumb2: return 1; } =20 +static inline int32_t extract32(uint32_t value, int start, int length) +{ + int32_t ret; + + if ( !(start >=3D 0 && length > 0 && length <=3D 32 - start) ) + return -EINVAL; + + ret =3D (value >> start) & (~0U >> (32 - length)); + + return ret; +} + +static int decode_64bit_loadstore_postindexing(register_t pc, struct hsr_d= abt *dabt) +{ + uint32_t instr; + int size; + int v; + int opc; + int rt; + int imm9; + + /* For details on decoding, refer to Armv8 Architecture reference manu= al + * Section - "Load/store register (immediate post-indexed)", Pg 318 + */ + if ( raw_copy_from_guest(&instr, (void * __user)pc, sizeof (instr)) ) + return -EFAULT; + + /* First, let's check for the fixed values */ + + /* As per the "Encoding table for the Loads and Stores group", Pg 299 + * op4 =3D 1 - Load/store register (immediate post-indexed) + */ + if ( extract32(instr, 10, 2) !=3D 1 ) + goto bad_64bit_loadstore; + + /* For the following, refer to "Load/store register (immediate post-in= dexed)" + * to get the fixed values at various bit positions. + */ + if ( extract32(instr, 21, 1) !=3D 0 ) + goto bad_64bit_loadstore; + + if ( extract32(instr, 24, 2) !=3D 0 ) + goto bad_64bit_loadstore; + + if ( extract32(instr, 27, 3) !=3D 7 ) + goto bad_64bit_loadstore; + + size =3D extract32(instr, 30, 2); + v =3D extract32(instr, 26, 1); + opc =3D extract32(instr, 22, 1); + + /* At the moment, we support STR(immediate) - 32 bit variant and + * LDR(immediate) - 32 bit variant only. + */ + if (!((size=3D=3D2) && (v=3D=3D0) && ((opc=3D=3D0) || (opc=3D=3D1)))) + goto bad_64bit_loadstore; + + rt =3D extract32(instr, 0, 5); + imm9 =3D extract32(instr, 12, 9); + + if ( imm9 < 0 ) + update_dabt(dabt, rt, size, true); + else + update_dabt(dabt, rt, size, false); + + dabt->valid =3D 1; + + + return 0; +bad_64bit_loadstore: + gprintk(XENLOG_ERR, "unhandled 64bit instruction 0x%x\n", instr); + return 1; +} + static int decode_thumb(register_t pc, struct hsr_dabt *dabt) { uint16_t instr; @@ -155,6 +229,9 @@ int decode_instruction(const struct cpu_user_regs *regs= , struct hsr_dabt *dabt) if ( is_32bit_domain(current->domain) && regs->cpsr & PSR_THUMB ) return decode_thumb(regs->pc, dabt); =20 + if ( is_64bit_domain(current->domain) ) + return decode_64bit_loadstore_postindexing(regs->pc, dabt); + /* TODO: Handle ARM instruction */ gprintk(XENLOG_ERR, "unhandled ARM instruction\n"); =20 diff --git a/xen/arch/arm/io.c b/xen/arch/arm/io.c index 729287e37c..49e80358c0 100644 --- a/xen/arch/arm/io.c +++ b/xen/arch/arm/io.c @@ -106,14 +106,13 @@ enum io_state try_handle_mmio(struct cpu_user_regs *r= egs, .gpa =3D gpa, .dabt =3D dabt }; + int rc; =20 ASSERT(hsr.ec =3D=3D HSR_EC_DATA_ABORT_LOWER_EL); =20 handler =3D find_mmio_handler(v->domain, info.gpa); if ( !handler ) { - int rc; - rc =3D try_fwd_ioserv(regs, v, &info); if ( rc =3D=3D IO_HANDLED ) return handle_ioserv(regs, v); @@ -123,7 +122,16 @@ enum io_state try_handle_mmio(struct cpu_user_regs *re= gs, =20 /* All the instructions used on emulated MMIO region should be valid */ if ( !dabt.valid ) - return IO_ABORT; + { + /* + * Post indexing ldr/str instructions are not emulated by Xen. So,= the + * ISS is invalid. In such a scenario, we try to manually decode t= he + * instruction from the program counter. + */ + rc =3D decode_instruction(regs, &info.dabt); + if ( rc ) + return IO_ABORT; + } =20 /* * Erratum 766422: Thumb store translation fault to Hypervisor may --=20 2.17.1