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client-ip=149.199.80.198; helo=xir-pvapexch01.xlnx.xilinx.com; From: Ayan Kumar Halder To: CC: , , , , , Ayan Kumar Halder Subject: [XEN v6 1/3] xen/arm64: Decode ldr/str post increment operations Date: Wed, 2 Feb 2022 17:30:15 +0000 Message-ID: <20220202173017.48463-2-ayankuma@xilinx.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220202173017.48463-1-ayankuma@xilinx.com> References: <20220202173017.48463-1-ayankuma@xilinx.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 0f04e706-26ab-4a20-21be-08d9e671b1a9 X-MS-TrafficTypeDiagnostic: MN2PR02MB6047: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-pvapexch01.xlnx.xilinx.com;PTR:unknown-80-198.xilinx.com;CAT:NONE;SFS:(13230001)(4636009)(46966006)(36840700001)(83380400001)(7696005)(426003)(36756003)(2906002)(316002)(26005)(336012)(54906003)(6916009)(2616005)(186003)(1076003)(356005)(107886003)(36860700001)(7636003)(70206006)(47076005)(5660300002)(8676002)(82310400004)(4326008)(8936002)(9786002)(508600001)(70586007)(6666004)(102446001);DIR:OUT;SFP:1101; X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Feb 2022 17:30:23.4261 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0f04e706-26ab-4a20-21be-08d9e671b1a9 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: BN1NAM02FT016.eop-nam02.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR02MB6047 At the moment, Xen does not decode any of the arm64 instructions. This means that hsr_dabt.isv = 0, Xen cannot handle those instructions. This will lead to Xen abort the guests (from which those instructions originated). 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 patches, 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. xen/arch/arm/decode.c | 80 ++++++++++++++++++++++++++++++++- xen/arch/arm/decode.h | 49 +++++++++++++++++--- xen/arch/arm/include/asm/mmio.h | 4 ++ xen/arch/arm/io.c | 2 +- 4 files changed, 125 insertions(+), 10 deletions(-) diff --git a/xen/arch/arm/decode.c b/xen/arch/arm/decode.c index 792c2e92a7..3f2d2a3f62 100644 --- a/xen/arch/arm/decode.c +++ b/xen/arch/arm/decode.c @@ -23,6 +23,7 @@ #include #include +#include #include "decode.h" @@ -84,6 +85,78 @@ 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"); + goto bad_loadstore; + } + + /* + * 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", 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 +223,13 @@ 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..fe7512a053 100644 --- a/xen/arch/arm/decode.h +++ b/xen/arch/arm/decode.h @@ -23,19 +23,54 @@ #include #include -/** - * Decode an instruction from pc - * /!\ This function is not intended to fully decode an instruction. It - * considers that the instruction is valid. +/* + * 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 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");