armv8_cpu.cc revision 11891:5886cd7ec57b
1/* 2 * Copyright (c) 2015 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions are 16 * met: redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer; 18 * redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution; 21 * neither the name of the copyright holders nor the names of its 22 * contributors may be used to endorse or promote products derived from 23 * this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 * 37 * Authors: Andreas Sandberg 38 */ 39 40#include "arch/arm/kvm/armv8_cpu.hh" 41 42#include <linux/kvm.h> 43 44#include "debug/KvmContext.hh" 45#include "params/ArmV8KvmCPU.hh" 46 47// Unlike gem5, kvm doesn't count the SP as a normal integer register, 48// which means we only have 31 normal integer registers. 49constexpr static unsigned NUM_XREGS = NUM_ARCH_INTREGS - 1; 50static_assert(NUM_XREGS == 31, "Unexpected number of aarch64 int. regs."); 51 52// The KVM interface accesses vector registers of 4 single precision 53// floats instead of individual registers. 54constexpr static unsigned NUM_QREGS = NumFloatV8ArchRegs / 4; 55static_assert(NUM_QREGS == 32, "Unexpected number of aarch64 vector regs."); 56 57#define EXTRACT_FIELD(v, name) \ 58 (((v) & name ## _MASK) >> name ## _SHIFT) 59 60#define CORE_REG(name, size) \ 61 (KVM_REG_ARM64 | KVM_REG_ARM_CORE | \ 62 KVM_REG_SIZE_ ## size | \ 63 KVM_REG_ARM_CORE_REG(name)) 64 65#define INT_REG(name) CORE_REG(name, U64) 66#define SIMD_REG(name) CORE_REG(name, U128) 67 68constexpr uint64_t 69kvmXReg(const int num) 70{ 71 return INT_REG(regs.regs[0]) + 72 (INT_REG(regs.regs[1]) - INT_REG(regs.regs[0])) * num; 73} 74 75constexpr uint64_t 76kvmFPReg(const int num) 77{ 78 return SIMD_REG(fp_regs.vregs[0]) + 79 (SIMD_REG(fp_regs.vregs[1]) - SIMD_REG(fp_regs.vregs[0])) * num; 80} 81 82union KvmFPReg { 83 union { 84 uint32_t i; 85 float f; 86 } s[4]; 87 88 union { 89 uint64_t i; 90 double f; 91 } d[2]; 92 93 uint8_t data[32]; 94}; 95 96#define FP_REGS_PER_VFP_REG 4 97static_assert(sizeof(FloatRegBits) == 4, "Unexpected float reg size"); 98 99const std::vector<ArmV8KvmCPU::IntRegInfo> ArmV8KvmCPU::intRegMap = { 100 { INT_REG(regs.sp), INTREG_SP0, "SP(EL0)" }, 101 { INT_REG(sp_el1), INTREG_SP1, "SP(EL1)" }, 102}; 103 104const std::vector<ArmV8KvmCPU::MiscRegInfo> ArmV8KvmCPU::miscRegMap = { 105 MiscRegInfo(INT_REG(elr_el1), MISCREG_ELR_EL1, "ELR(EL1)"), 106 MiscRegInfo(INT_REG(spsr[KVM_SPSR_EL1]), MISCREG_SPSR_EL1, "SPSR(EL1)"), 107 MiscRegInfo(INT_REG(spsr[KVM_SPSR_ABT]), MISCREG_SPSR_ABT, "SPSR(ABT)"), 108 MiscRegInfo(INT_REG(spsr[KVM_SPSR_UND]), MISCREG_SPSR_UND, "SPSR(UND)"), 109 MiscRegInfo(INT_REG(spsr[KVM_SPSR_IRQ]), MISCREG_SPSR_IRQ, "SPSR(IRQ)"), 110 MiscRegInfo(INT_REG(spsr[KVM_SPSR_FIQ]), MISCREG_SPSR_FIQ, "SPSR(FIQ)"), 111 MiscRegInfo(INT_REG(fp_regs.fpsr), MISCREG_FPSR, "FPSR"), 112 MiscRegInfo(INT_REG(fp_regs.fpcr), MISCREG_FPCR, "FPCR"), 113}; 114 115ArmV8KvmCPU::ArmV8KvmCPU(ArmV8KvmCPUParams *params) 116 : BaseArmKvmCPU(params) 117{ 118} 119 120ArmV8KvmCPU::~ArmV8KvmCPU() 121{ 122} 123 124void 125ArmV8KvmCPU::dump() const 126{ 127 inform("Integer registers:\n"); 128 inform(" PC: %s\n", getAndFormatOneReg(INT_REG(regs.pc))); 129 for (int i = 0; i < NUM_XREGS; ++i) 130 inform(" X%i: %s\n", i, getAndFormatOneReg(kvmXReg(i))); 131 132 for (int i = 0; i < NUM_QREGS; ++i) 133 inform(" Q%i: %s\n", i, getAndFormatOneReg(kvmFPReg(i))); 134 135 for (const auto &ri : intRegMap) 136 inform(" %s: %s\n", ri.name, getAndFormatOneReg(ri.kvm)); 137 138 inform(" %s: %s\n", "PSTATE", getAndFormatOneReg(INT_REG(regs.pstate))); 139 140 for (const auto &ri : miscRegMap) 141 inform(" %s: %s\n", ri.name, getAndFormatOneReg(ri.kvm)); 142 143 for (const auto ® : getRegList()) { 144 const uint64_t arch(reg & KVM_REG_ARCH_MASK); 145 if (arch != KVM_REG_ARM64) { 146 inform("0x%x: %s\n", reg, getAndFormatOneReg(reg)); 147 continue; 148 } 149 150 const uint64_t type(reg & KVM_REG_ARM_COPROC_MASK); 151 switch (type) { 152 case KVM_REG_ARM_CORE: 153 // These have already been printed 154 break; 155 156 case KVM_REG_ARM64_SYSREG: { 157 const uint64_t op0(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_OP0)); 158 const uint64_t op1(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_OP1)); 159 const uint64_t crn(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_CRN)); 160 const uint64_t crm(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_CRM)); 161 const uint64_t op2(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_OP2)); 162 const MiscRegIndex idx( 163 decodeAArch64SysReg(op0, op1, crn, crm, op2)); 164 165 inform(" %s (op0: %i, op1: %i, crn: %i, crm: %i, op2: %i): %s", 166 miscRegName[idx], op0, op1, crn, crm, op2, 167 getAndFormatOneReg(reg)); 168 } break; 169 170 case KVM_REG_ARM_DEMUX: { 171 const uint64_t id(EXTRACT_FIELD(reg, KVM_REG_ARM_DEMUX_ID)); 172 const uint64_t val(EXTRACT_FIELD(reg, KVM_REG_ARM_DEMUX_VAL)); 173 if (id == KVM_REG_ARM_DEMUX_ID_CCSIDR) { 174 inform(" CSSIDR[%i]: %s\n", val, 175 getAndFormatOneReg(reg)); 176 } else { 177 inform(" UNKNOWN[%i:%i]: %s\n", id, val, 178 getAndFormatOneReg(reg)); 179 } 180 } break; 181 182 default: 183 inform("0x%x: %s\n", reg, getAndFormatOneReg(reg)); 184 } 185 } 186} 187 188void 189ArmV8KvmCPU::updateKvmState() 190{ 191 DPRINTF(KvmContext, "In updateKvmState():\n"); 192 193 // update pstate register state 194 CPSR cpsr(tc->readMiscReg(MISCREG_CPSR)); 195 cpsr.nz = tc->readCCReg(CCREG_NZ); 196 cpsr.c = tc->readCCReg(CCREG_C); 197 cpsr.v = tc->readCCReg(CCREG_V); 198 if (cpsr.width) { 199 cpsr.ge = tc->readCCReg(CCREG_GE); 200 } else { 201 cpsr.ge = 0; 202 } 203 DPRINTF(KvmContext, " %s := 0x%x\n", "PSTATE", cpsr); 204 setOneReg(INT_REG(regs.pstate), cpsr); 205 206 for (const auto &ri : miscRegMap) { 207 const uint64_t value(tc->readMiscReg(ri.idx)); 208 DPRINTF(KvmContext, " %s := 0x%x\n", ri.name, value); 209 setOneReg(ri.kvm, value); 210 } 211 212 for (int i = 0; i < NUM_XREGS; ++i) { 213 const uint64_t value(tc->readIntReg(INTREG_X0 + i)); 214 DPRINTF(KvmContext, " X%i := 0x%x\n", i, value); 215 setOneReg(kvmXReg(i), value); 216 } 217 218 for (const auto &ri : intRegMap) { 219 const uint64_t value(tc->readIntReg(ri.idx)); 220 DPRINTF(KvmContext, " %s := 0x%x\n", ri.name, value); 221 setOneReg(ri.kvm, value); 222 } 223 224 for (int i = 0; i < NUM_QREGS; ++i) { 225 const RegIndex reg_base(i * FP_REGS_PER_VFP_REG); 226 KvmFPReg reg; 227 for (int j = 0; j < FP_REGS_PER_VFP_REG; j++) 228 reg.s[j].i = tc->readFloatRegBits(reg_base + j); 229 230 setOneReg(kvmFPReg(i), reg.data); 231 DPRINTF(KvmContext, " Q%i: %s\n", i, getAndFormatOneReg(kvmFPReg(i))); 232 } 233 234 for (const auto &ri : getSysRegMap()) { 235 const uint64_t value(tc->readMiscReg(ri.idx)); 236 DPRINTF(KvmContext, " %s := 0x%x\n", ri.name, value); 237 setOneReg(ri.kvm, value); 238 } 239 240 setOneReg(INT_REG(regs.pc), tc->instAddr()); 241 DPRINTF(KvmContext, " PC := 0x%x\n", tc->instAddr()); 242} 243 244void 245ArmV8KvmCPU::updateThreadContext() 246{ 247 DPRINTF(KvmContext, "In updateThreadContext():\n"); 248 249 // Update pstate thread context 250 const CPSR cpsr(tc->readMiscRegNoEffect(MISCREG_CPSR)); 251 DPRINTF(KvmContext, " %s := 0x%x\n", "PSTATE", cpsr); 252 tc->setMiscRegNoEffect(MISCREG_CPSR, cpsr); 253 tc->setCCReg(CCREG_NZ, cpsr.nz); 254 tc->setCCReg(CCREG_C, cpsr.c); 255 tc->setCCReg(CCREG_V, cpsr.v); 256 if (cpsr.width) { 257 tc->setCCReg(CCREG_GE, cpsr.ge); 258 } 259 260 // Update core misc regs first as they 261 // affect how other registers are mapped. 262 for (const auto &ri : miscRegMap) { 263 const auto value(getOneRegU64(ri.kvm)); 264 DPRINTF(KvmContext, " %s := 0x%x\n", ri.name, value); 265 tc->setMiscRegNoEffect(ri.idx, value); 266 } 267 268 for (int i = 0; i < NUM_XREGS; ++i) { 269 const auto value(getOneRegU64(kvmXReg(i))); 270 DPRINTF(KvmContext, " X%i := 0x%x\n", i, value); 271 // KVM64 returns registers in 64-bit layout. If we are in aarch32 272 // mode, we need to map these to banked ARM32 registers. 273 if (inAArch64(tc)) { 274 tc->setIntReg(INTREG_X0 + i, value); 275 } else { 276 tc->setIntRegFlat(IntReg64Map[INTREG_X0 + i], value); 277 } 278 } 279 280 for (const auto &ri : intRegMap) { 281 const auto value(getOneRegU64(ri.kvm)); 282 DPRINTF(KvmContext, " %s := 0x%x\n", ri.name, value); 283 tc->setIntReg(ri.idx, value); 284 } 285 286 for (int i = 0; i < NUM_QREGS; ++i) { 287 const RegIndex reg_base(i * FP_REGS_PER_VFP_REG); 288 KvmFPReg reg; 289 DPRINTF(KvmContext, " Q%i: %s\n", i, getAndFormatOneReg(kvmFPReg(i))); 290 getOneReg(kvmFPReg(i), reg.data); 291 for (int j = 0; j < FP_REGS_PER_VFP_REG; j++) 292 tc->setFloatRegBits(reg_base + j, reg.s[j].i); 293 } 294 295 for (const auto &ri : getSysRegMap()) { 296 const auto value(getOneRegU64(ri.kvm)); 297 DPRINTF(KvmContext, " %s := 0x%x\n", ri.name, value); 298 tc->setMiscRegNoEffect(ri.idx, value); 299 } 300 301 PCState pc(getOneRegU64(INT_REG(regs.pc))); 302 pc.aarch64(inAArch64(tc)); 303 pc.thumb(cpsr.t); 304 pc.nextAArch64(inAArch64(tc)); 305 // TODO: This is a massive assumption that will break when 306 // switching to thumb. 307 pc.nextThumb(cpsr.t); 308 DPRINTF(KvmContext, " PC := 0x%x (t: %i, a64: %i)\n", 309 pc.instAddr(), pc.thumb(), pc.aarch64()); 310 tc->pcState(pc); 311} 312 313const std::vector<ArmV8KvmCPU::MiscRegInfo> & 314ArmV8KvmCPU::getSysRegMap() const 315{ 316 // Try to use the cached map 317 if (!sysRegMap.empty()) 318 return sysRegMap; 319 320 for (const auto ® : getRegList()) { 321 const uint64_t arch(reg & KVM_REG_ARCH_MASK); 322 if (arch != KVM_REG_ARM64) 323 continue; 324 325 const uint64_t type(reg & KVM_REG_ARM_COPROC_MASK); 326 if (type != KVM_REG_ARM64_SYSREG) 327 continue; 328 329 const uint64_t op0(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_OP0)); 330 const uint64_t op1(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_OP1)); 331 const uint64_t crn(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_CRN)); 332 const uint64_t crm(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_CRM)); 333 const uint64_t op2(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_OP2)); 334 const MiscRegIndex idx(decodeAArch64SysReg(op0, op1, crn, crm, op2)); 335 const auto &info(miscRegInfo[idx]); 336 const bool writeable( 337 info[MISCREG_USR_NS_WR] || info[MISCREG_USR_S_WR] || 338 info[MISCREG_PRI_S_WR] || info[MISCREG_PRI_NS_WR] || 339 info[MISCREG_HYP_WR] || 340 info[MISCREG_MON_NS0_WR] || info[MISCREG_MON_NS1_WR]); 341 const bool implemented( 342 info[MISCREG_IMPLEMENTED] || info[MISCREG_WARN_NOT_FAIL]); 343 344 // Only add implemented registers that we are going to be able 345 // to write. 346 if (implemented && writeable) 347 sysRegMap.emplace_back(reg, idx, miscRegName[idx]); 348 } 349 350 return sysRegMap; 351} 352 353ArmV8KvmCPU * 354ArmV8KvmCPUParams::create() 355{ 356 return new ArmV8KvmCPU(this); 357} 358