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client-ip=149.199.80.198; helo=xir-pvapexch02.xlnx.xilinx.com; From: Ayan Kumar Halder To: CC: , , , , , Ayan Kumar Halder Subject: [XEN v8 1/2] xen/arm64: Decode ldr/str post increment operations Date: Sat, 12 Feb 2022 23:34:32 +0000 Message-ID: <20220212233433.46018-2-ayankuma@xilinx.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220212233433.46018-1-ayankuma@xilinx.com> References: <20220212233433.46018-1-ayankuma@xilinx.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 5720377c-b70b-4657-a1b4-08d9ee804110 X-MS-TrafficTypeDiagnostic: BL0PR02MB4580:EE_ X-Microsoft-Antispam-PRVS: X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply X-MS-Oob-TLC-OOBClassifiers: OLM:10000; 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-pvapexch02.xlnx.xilinx.com;PTR:unknown-80-198.xilinx.com;CAT:NONE;SFS:(13230001)(4636009)(46966006)(36840700001)(5660300002)(2616005)(336012)(426003)(6666004)(83380400001)(8936002)(9786002)(1076003)(107886003)(508600001)(36756003)(186003)(26005)(7696005)(2906002)(36860700001)(4326008)(6916009)(82310400004)(47076005)(54906003)(316002)(356005)(70586007)(8676002)(70206006)(7636003)(102446001);DIR:OUT;SFP:1101; X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Feb 2022 23:34:46.1813 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5720377c-b70b-4657-a1b4-08d9ee804110 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-pvapexch02.xlnx.xilinx.com] X-MS-Exchange-CrossTenant-AuthSource: SN1NAM02FT0060.eop-nam02.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR02MB4580 At the moment, Xen does not decode any of the arm64 instructions. This means that when hsr_dabt.isv == 0, Xen cannot handle those instructions. This will lead to Xen to abort the guests (from which those instructions originate). With this patch, Xen is able to decode ldr/str post indexing instructions. These are a subset of instructions for which hsr_dabt.isv == 0. The following instructions are now supported by Xen :- 1. ldr x2, [x1], #8 2. ldr w2, [x1], #-4 3. ldr x2, [x1], #-8 4. ldr w2, [x1], #4 5. ldrh w2, [x1], #2 6. ldrb w2, [x1], #1 7. str x2, [x1], #8 8. str w2, [x1], #-4 9. strh w2, [x1], #2 10. strb w2, [x1], #1 In the subsequent patch, decode_arm64() will get invoked when hsr_dabt.isv == 0. Signed-off-by: Ayan Kumar Halder --- Changelog :- v2..v5 - Mentioned in the cover letter. v6 - 1. Fixed the code style issues as mentioned in v5. v7 - No change. v8 - 1. Removed some un-necessary header files inclusion. 2. Some style changes pointed out in v7. xen/arch/arm/decode.c | 79 ++++++++++++++++++++++++++++++++- xen/arch/arm/decode.h | 48 +++++++++++++++++--- xen/arch/arm/include/asm/mmio.h | 4 ++ xen/arch/arm/io.c | 2 +- 4 files changed, 124 insertions(+), 9 deletions(-) diff --git a/xen/arch/arm/decode.c b/xen/arch/arm/decode.c index 792c2e92a7..3c3cd703e0 100644 --- a/xen/arch/arm/decode.c +++ b/xen/arch/arm/decode.c @@ -84,6 +84,78 @@ bad_thumb2: return 1; } +static int decode_arm64(register_t pc, mmio_info_t *info) +{ + union instr opcode = {0}; + struct hsr_dabt *dabt = &info->dabt; + struct instr_details *dabt_instr = &info->dabt_instr; + + if ( raw_copy_from_guest(&opcode.value, (void * __user)pc, sizeof (opcode)) ) + { + gprintk(XENLOG_ERR, "Could not copy the instruction from PC\n"); + return 1; + } + + /* + * Refer Arm v8 ARM DDI 0487G.b, Page - C6-1107 + * "Shared decode for all encodings" (under ldr immediate) + * If n == t && n != 31, then the return value is implementation defined + * (can be WBSUPPRESS, UNKNOWN, UNDEFINED or NOP). Thus, we do not support + * this. This holds true for ldrb/ldrh immediate as well. + * + * Also refer, Page - C6-1384, the above described behaviour is same for + * str immediate. This holds true for strb/strh immediate as well + */ + if ( (opcode.ldr_str.rn == opcode.ldr_str.rt) && (opcode.ldr_str.rn != 31) ) + { + gprintk(XENLOG_ERR, "Rn should not be equal to Rt except for r31\n"); + goto bad_loadstore; + } + + /* First, let's check for the fixed values */ + if ( (opcode.value & POST_INDEX_FIXED_MASK) != POST_INDEX_FIXED_VALUE ) + { + gprintk(XENLOG_ERR, + "Decoding instruction 0x%x is not supported\n", opcode.value); + goto bad_loadstore; + } + + if ( opcode.ldr_str.v != 0 ) + { + gprintk(XENLOG_ERR, + "ldr/str post indexing for vector types are not supported\n"); + goto bad_loadstore; + } + + /* Check for STR (immediate) */ + if ( opcode.ldr_str.opc == 0 ) + dabt->write = 1; + /* Check for LDR (immediate) */ + else if ( opcode.ldr_str.opc == 1 ) + dabt->write = 0; + else + { + gprintk(XENLOG_ERR, + "Decoding ldr/str post indexing is not supported for this variant\n"); + goto bad_loadstore; + } + + gprintk(XENLOG_INFO, + "opcode->ldr_str.rt = 0x%x, opcode->ldr_str.size = 0x%x, opcode->ldr_str.imm9 = %d\n", + opcode.ldr_str.rt, opcode.ldr_str.size, opcode.ldr_str.imm9); + + update_dabt(dabt, opcode.ldr_str.rt, opcode.ldr_str.size, false); + + dabt_instr->rn = opcode.ldr_str.rn; + dabt_instr->imm9 = opcode.ldr_str.imm9; + + return 0; + + bad_loadstore: + gprintk(XENLOG_ERR, "unhandled Arm instruction 0x%x\n", opcode.value); + return 1; +} + static int decode_thumb(register_t pc, struct hsr_dabt *dabt) { uint16_t instr; @@ -150,10 +222,13 @@ bad_thumb: return 1; } -int decode_instruction(const struct cpu_user_regs *regs, struct hsr_dabt *dabt) +int decode_instruction(const struct cpu_user_regs *regs, mmio_info_t *info) { if ( is_32bit_domain(current->domain) && regs->cpsr & PSR_THUMB ) - return decode_thumb(regs->pc, dabt); + return decode_thumb(regs->pc, &info->dabt); + + if ( !psr_mode_is_32bit(regs) ) + return decode_arm64(regs->pc, info); /* TODO: Handle ARM instruction */ gprintk(XENLOG_ERR, "unhandled ARM instruction\n"); diff --git a/xen/arch/arm/decode.h b/xen/arch/arm/decode.h index 4613763bdb..13db8ac968 100644 --- a/xen/arch/arm/decode.h +++ b/xen/arch/arm/decode.h @@ -23,19 +23,55 @@ #include #include -/** +/* + * Refer to the ARMv8 ARM (DDI 0487G.b), Section C4.1.4 Loads and Stores + * Page 318 specifies the following bit pattern for + * "load/store register (immediate post-indexed)". + * + * 31 30 29 27 26 25 23 21 20 11 9 4 0 + * ___________________________________________________________________ + * |size|1 1 1 |V |0 0 |opc |0 | imm9 |0 1 | Rn | Rt | + * |____|______|__|____|____|__|_______________|____|_________|_______| + */ +union instr { + uint32_t value; + struct { + unsigned int rt:5; /* Rt register */ + unsigned int rn:5; /* Rn register */ + unsigned int fixed1:2; /* value == 01b */ + signed int imm9:9; /* imm9 */ + unsigned int fixed2:1; /* value == 0b */ + unsigned int opc:2; /* opc */ + unsigned int fixed3:2; /* value == 00b */ + unsigned int v:1; /* vector */ + unsigned int fixed4:3; /* value == 111b */ + unsigned int size:2; /* size */ + } ldr_str; +}; + +#define POST_INDEX_FIXED_MASK 0x3B200C00 +#define POST_INDEX_FIXED_VALUE 0x38000400 + +/* * Decode an instruction from pc - * /!\ This function is not intended to fully decode an instruction. It - * considers that the instruction is valid. + * /!\ This function is intended to decode an instruction. It considers that the + * instruction is valid. * - * This function will get: - * - The transfer register + * In case of thumb mode, this function will get: + * - The transfer register (ie Rt) * - Sign bit * - Size + * + * In case of arm64 mode, this function will get: + * - The transfer register (ie Rt) + * - The source register (ie Rn) + * - Size + * - Immediate offset + * - Read or write */ int decode_instruction(const struct cpu_user_regs *regs, - struct hsr_dabt *dabt); + mmio_info_t *info); #endif /* __ARCH_ARM_DECODE_H_ */ diff --git a/xen/arch/arm/include/asm/mmio.h b/xen/arch/arm/include/asm/mmio.h index 7ab873cb8f..3354d9c635 100644 --- a/xen/arch/arm/include/asm/mmio.h +++ b/xen/arch/arm/include/asm/mmio.h @@ -29,6 +29,10 @@ typedef struct { struct hsr_dabt dabt; + struct instr_details { + unsigned long rn:5; + signed int imm9:9; + } dabt_instr; paddr_t gpa; } mmio_info_t; diff --git a/xen/arch/arm/io.c b/xen/arch/arm/io.c index 729287e37c..a289d393f9 100644 --- a/xen/arch/arm/io.c +++ b/xen/arch/arm/io.c @@ -134,7 +134,7 @@ enum io_state try_handle_mmio(struct cpu_user_regs *regs, { int rc; - rc = decode_instruction(regs, &info.dabt); + rc = decode_instruction(regs, &info); if ( rc ) { gprintk(XENLOG_DEBUG, "Unable to decode instruction\n");