1 /* 2 * QEMU ARM CPU -- internal functions and types 3 * 4 * Copyright (c) 2014 Linaro Ltd 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 2 9 * of the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, see 18 * <http://www.gnu.org/licenses/gpl-2.0.html> 19 * 20 * This header defines functions, types, etc which need to be shared 21 * between different source files within target/arm/ but which are 22 * private to it and not required by the rest of QEMU. 23 */ 24 25 #ifndef TARGET_ARM_INTERNALS_H 26 #define TARGET_ARM_INTERNALS_H 27 28 #include "hw/registerfields.h" 29 30 /* register banks for CPU modes */ 31 #define BANK_USRSYS 0 32 #define BANK_SVC 1 33 #define BANK_ABT 2 34 #define BANK_UND 3 35 #define BANK_IRQ 4 36 #define BANK_FIQ 5 37 #define BANK_HYP 6 38 #define BANK_MON 7 39 40 static inline bool excp_is_internal(int excp) 41 { 42 /* Return true if this exception number represents a QEMU-internal 43 * exception that will not be passed to the guest. 44 */ 45 return excp == EXCP_INTERRUPT 46 || excp == EXCP_HLT 47 || excp == EXCP_DEBUG 48 || excp == EXCP_HALTED 49 || excp == EXCP_EXCEPTION_EXIT 50 || excp == EXCP_KERNEL_TRAP 51 || excp == EXCP_SEMIHOST; 52 } 53 54 /* Scale factor for generic timers, ie number of ns per tick. 55 * This gives a 62.5MHz timer. 56 */ 57 #define GTIMER_SCALE 16 58 59 /* Bit definitions for the v7M CONTROL register */ 60 FIELD(V7M_CONTROL, NPRIV, 0, 1) 61 FIELD(V7M_CONTROL, SPSEL, 1, 1) 62 FIELD(V7M_CONTROL, FPCA, 2, 1) 63 64 /* 65 * For AArch64, map a given EL to an index in the banked_spsr array. 66 * Note that this mapping and the AArch32 mapping defined in bank_number() 67 * must agree such that the AArch64<->AArch32 SPSRs have the architecturally 68 * mandated mapping between each other. 69 */ 70 static inline unsigned int aarch64_banked_spsr_index(unsigned int el) 71 { 72 static const unsigned int map[4] = { 73 [1] = BANK_SVC, /* EL1. */ 74 [2] = BANK_HYP, /* EL2. */ 75 [3] = BANK_MON, /* EL3. */ 76 }; 77 assert(el >= 1 && el <= 3); 78 return map[el]; 79 } 80 81 /* Map CPU modes onto saved register banks. */ 82 static inline int bank_number(int mode) 83 { 84 switch (mode) { 85 case ARM_CPU_MODE_USR: 86 case ARM_CPU_MODE_SYS: 87 return BANK_USRSYS; 88 case ARM_CPU_MODE_SVC: 89 return BANK_SVC; 90 case ARM_CPU_MODE_ABT: 91 return BANK_ABT; 92 case ARM_CPU_MODE_UND: 93 return BANK_UND; 94 case ARM_CPU_MODE_IRQ: 95 return BANK_IRQ; 96 case ARM_CPU_MODE_FIQ: 97 return BANK_FIQ; 98 case ARM_CPU_MODE_HYP: 99 return BANK_HYP; 100 case ARM_CPU_MODE_MON: 101 return BANK_MON; 102 } 103 g_assert_not_reached(); 104 } 105 106 void switch_mode(CPUARMState *, int); 107 void arm_cpu_register_gdb_regs_for_features(ARMCPU *cpu); 108 void arm_translate_init(void); 109 110 enum arm_fprounding { 111 FPROUNDING_TIEEVEN, 112 FPROUNDING_POSINF, 113 FPROUNDING_NEGINF, 114 FPROUNDING_ZERO, 115 FPROUNDING_TIEAWAY, 116 FPROUNDING_ODD 117 }; 118 119 int arm_rmode_to_sf(int rmode); 120 121 static inline void aarch64_save_sp(CPUARMState *env, int el) 122 { 123 if (env->pstate & PSTATE_SP) { 124 env->sp_el[el] = env->xregs[31]; 125 } else { 126 env->sp_el[0] = env->xregs[31]; 127 } 128 } 129 130 static inline void aarch64_restore_sp(CPUARMState *env, int el) 131 { 132 if (env->pstate & PSTATE_SP) { 133 env->xregs[31] = env->sp_el[el]; 134 } else { 135 env->xregs[31] = env->sp_el[0]; 136 } 137 } 138 139 static inline void update_spsel(CPUARMState *env, uint32_t imm) 140 { 141 unsigned int cur_el = arm_current_el(env); 142 /* Update PSTATE SPSel bit; this requires us to update the 143 * working stack pointer in xregs[31]. 144 */ 145 if (!((imm ^ env->pstate) & PSTATE_SP)) { 146 return; 147 } 148 aarch64_save_sp(env, cur_el); 149 env->pstate = deposit32(env->pstate, 0, 1, imm); 150 151 /* We rely on illegal updates to SPsel from EL0 to get trapped 152 * at translation time. 153 */ 154 assert(cur_el >= 1 && cur_el <= 3); 155 aarch64_restore_sp(env, cur_el); 156 } 157 158 /* 159 * arm_pamax 160 * @cpu: ARMCPU 161 * 162 * Returns the implementation defined bit-width of physical addresses. 163 * The ARMv8 reference manuals refer to this as PAMax(). 164 */ 165 static inline unsigned int arm_pamax(ARMCPU *cpu) 166 { 167 static const unsigned int pamax_map[] = { 168 [0] = 32, 169 [1] = 36, 170 [2] = 40, 171 [3] = 42, 172 [4] = 44, 173 [5] = 48, 174 }; 175 unsigned int parange = extract32(cpu->id_aa64mmfr0, 0, 4); 176 177 /* id_aa64mmfr0 is a read-only register so values outside of the 178 * supported mappings can be considered an implementation error. */ 179 assert(parange < ARRAY_SIZE(pamax_map)); 180 return pamax_map[parange]; 181 } 182 183 /* Return true if extended addresses are enabled. 184 * This is always the case if our translation regime is 64 bit, 185 * but depends on TTBCR.EAE for 32 bit. 186 */ 187 static inline bool extended_addresses_enabled(CPUARMState *env) 188 { 189 TCR *tcr = &env->cp15.tcr_el[arm_is_secure(env) ? 3 : 1]; 190 return arm_el_is_aa64(env, 1) || 191 (arm_feature(env, ARM_FEATURE_LPAE) && (tcr->raw_tcr & TTBCR_EAE)); 192 } 193 194 /* Valid Syndrome Register EC field values */ 195 enum arm_exception_class { 196 EC_UNCATEGORIZED = 0x00, 197 EC_WFX_TRAP = 0x01, 198 EC_CP15RTTRAP = 0x03, 199 EC_CP15RRTTRAP = 0x04, 200 EC_CP14RTTRAP = 0x05, 201 EC_CP14DTTRAP = 0x06, 202 EC_ADVSIMDFPACCESSTRAP = 0x07, 203 EC_FPIDTRAP = 0x08, 204 EC_CP14RRTTRAP = 0x0c, 205 EC_ILLEGALSTATE = 0x0e, 206 EC_AA32_SVC = 0x11, 207 EC_AA32_HVC = 0x12, 208 EC_AA32_SMC = 0x13, 209 EC_AA64_SVC = 0x15, 210 EC_AA64_HVC = 0x16, 211 EC_AA64_SMC = 0x17, 212 EC_SYSTEMREGISTERTRAP = 0x18, 213 EC_INSNABORT = 0x20, 214 EC_INSNABORT_SAME_EL = 0x21, 215 EC_PCALIGNMENT = 0x22, 216 EC_DATAABORT = 0x24, 217 EC_DATAABORT_SAME_EL = 0x25, 218 EC_SPALIGNMENT = 0x26, 219 EC_AA32_FPTRAP = 0x28, 220 EC_AA64_FPTRAP = 0x2c, 221 EC_SERROR = 0x2f, 222 EC_BREAKPOINT = 0x30, 223 EC_BREAKPOINT_SAME_EL = 0x31, 224 EC_SOFTWARESTEP = 0x32, 225 EC_SOFTWARESTEP_SAME_EL = 0x33, 226 EC_WATCHPOINT = 0x34, 227 EC_WATCHPOINT_SAME_EL = 0x35, 228 EC_AA32_BKPT = 0x38, 229 EC_VECTORCATCH = 0x3a, 230 EC_AA64_BKPT = 0x3c, 231 }; 232 233 #define ARM_EL_EC_SHIFT 26 234 #define ARM_EL_IL_SHIFT 25 235 #define ARM_EL_ISV_SHIFT 24 236 #define ARM_EL_IL (1 << ARM_EL_IL_SHIFT) 237 #define ARM_EL_ISV (1 << ARM_EL_ISV_SHIFT) 238 239 /* Utility functions for constructing various kinds of syndrome value. 240 * Note that in general we follow the AArch64 syndrome values; in a 241 * few cases the value in HSR for exceptions taken to AArch32 Hyp 242 * mode differs slightly, so if we ever implemented Hyp mode then the 243 * syndrome value would need some massaging on exception entry. 244 * (One example of this is that AArch64 defaults to IL bit set for 245 * exceptions which don't specifically indicate information about the 246 * trapping instruction, whereas AArch32 defaults to IL bit clear.) 247 */ 248 static inline uint32_t syn_uncategorized(void) 249 { 250 return (EC_UNCATEGORIZED << ARM_EL_EC_SHIFT) | ARM_EL_IL; 251 } 252 253 static inline uint32_t syn_aa64_svc(uint32_t imm16) 254 { 255 return (EC_AA64_SVC << ARM_EL_EC_SHIFT) | ARM_EL_IL | (imm16 & 0xffff); 256 } 257 258 static inline uint32_t syn_aa64_hvc(uint32_t imm16) 259 { 260 return (EC_AA64_HVC << ARM_EL_EC_SHIFT) | ARM_EL_IL | (imm16 & 0xffff); 261 } 262 263 static inline uint32_t syn_aa64_smc(uint32_t imm16) 264 { 265 return (EC_AA64_SMC << ARM_EL_EC_SHIFT) | ARM_EL_IL | (imm16 & 0xffff); 266 } 267 268 static inline uint32_t syn_aa32_svc(uint32_t imm16, bool is_16bit) 269 { 270 return (EC_AA32_SVC << ARM_EL_EC_SHIFT) | (imm16 & 0xffff) 271 | (is_16bit ? 0 : ARM_EL_IL); 272 } 273 274 static inline uint32_t syn_aa32_hvc(uint32_t imm16) 275 { 276 return (EC_AA32_HVC << ARM_EL_EC_SHIFT) | ARM_EL_IL | (imm16 & 0xffff); 277 } 278 279 static inline uint32_t syn_aa32_smc(void) 280 { 281 return (EC_AA32_SMC << ARM_EL_EC_SHIFT) | ARM_EL_IL; 282 } 283 284 static inline uint32_t syn_aa64_bkpt(uint32_t imm16) 285 { 286 return (EC_AA64_BKPT << ARM_EL_EC_SHIFT) | ARM_EL_IL | (imm16 & 0xffff); 287 } 288 289 static inline uint32_t syn_aa32_bkpt(uint32_t imm16, bool is_16bit) 290 { 291 return (EC_AA32_BKPT << ARM_EL_EC_SHIFT) | (imm16 & 0xffff) 292 | (is_16bit ? 0 : ARM_EL_IL); 293 } 294 295 static inline uint32_t syn_aa64_sysregtrap(int op0, int op1, int op2, 296 int crn, int crm, int rt, 297 int isread) 298 { 299 return (EC_SYSTEMREGISTERTRAP << ARM_EL_EC_SHIFT) | ARM_EL_IL 300 | (op0 << 20) | (op2 << 17) | (op1 << 14) | (crn << 10) | (rt << 5) 301 | (crm << 1) | isread; 302 } 303 304 static inline uint32_t syn_cp14_rt_trap(int cv, int cond, int opc1, int opc2, 305 int crn, int crm, int rt, int isread, 306 bool is_16bit) 307 { 308 return (EC_CP14RTTRAP << ARM_EL_EC_SHIFT) 309 | (is_16bit ? 0 : ARM_EL_IL) 310 | (cv << 24) | (cond << 20) | (opc2 << 17) | (opc1 << 14) 311 | (crn << 10) | (rt << 5) | (crm << 1) | isread; 312 } 313 314 static inline uint32_t syn_cp15_rt_trap(int cv, int cond, int opc1, int opc2, 315 int crn, int crm, int rt, int isread, 316 bool is_16bit) 317 { 318 return (EC_CP15RTTRAP << ARM_EL_EC_SHIFT) 319 | (is_16bit ? 0 : ARM_EL_IL) 320 | (cv << 24) | (cond << 20) | (opc2 << 17) | (opc1 << 14) 321 | (crn << 10) | (rt << 5) | (crm << 1) | isread; 322 } 323 324 static inline uint32_t syn_cp14_rrt_trap(int cv, int cond, int opc1, int crm, 325 int rt, int rt2, int isread, 326 bool is_16bit) 327 { 328 return (EC_CP14RRTTRAP << ARM_EL_EC_SHIFT) 329 | (is_16bit ? 0 : ARM_EL_IL) 330 | (cv << 24) | (cond << 20) | (opc1 << 16) 331 | (rt2 << 10) | (rt << 5) | (crm << 1) | isread; 332 } 333 334 static inline uint32_t syn_cp15_rrt_trap(int cv, int cond, int opc1, int crm, 335 int rt, int rt2, int isread, 336 bool is_16bit) 337 { 338 return (EC_CP15RRTTRAP << ARM_EL_EC_SHIFT) 339 | (is_16bit ? 0 : ARM_EL_IL) 340 | (cv << 24) | (cond << 20) | (opc1 << 16) 341 | (rt2 << 10) | (rt << 5) | (crm << 1) | isread; 342 } 343 344 static inline uint32_t syn_fp_access_trap(int cv, int cond, bool is_16bit) 345 { 346 return (EC_ADVSIMDFPACCESSTRAP << ARM_EL_EC_SHIFT) 347 | (is_16bit ? 0 : ARM_EL_IL) 348 | (cv << 24) | (cond << 20); 349 } 350 351 static inline uint32_t syn_insn_abort(int same_el, int ea, int s1ptw, int fsc) 352 { 353 return (EC_INSNABORT << ARM_EL_EC_SHIFT) | (same_el << ARM_EL_EC_SHIFT) 354 | ARM_EL_IL | (ea << 9) | (s1ptw << 7) | fsc; 355 } 356 357 static inline uint32_t syn_data_abort_no_iss(int same_el, 358 int ea, int cm, int s1ptw, 359 int wnr, int fsc) 360 { 361 return (EC_DATAABORT << ARM_EL_EC_SHIFT) | (same_el << ARM_EL_EC_SHIFT) 362 | ARM_EL_IL 363 | (ea << 9) | (cm << 8) | (s1ptw << 7) | (wnr << 6) | fsc; 364 } 365 366 static inline uint32_t syn_data_abort_with_iss(int same_el, 367 int sas, int sse, int srt, 368 int sf, int ar, 369 int ea, int cm, int s1ptw, 370 int wnr, int fsc, 371 bool is_16bit) 372 { 373 return (EC_DATAABORT << ARM_EL_EC_SHIFT) | (same_el << ARM_EL_EC_SHIFT) 374 | (is_16bit ? 0 : ARM_EL_IL) 375 | ARM_EL_ISV | (sas << 22) | (sse << 21) | (srt << 16) 376 | (sf << 15) | (ar << 14) 377 | (ea << 9) | (cm << 8) | (s1ptw << 7) | (wnr << 6) | fsc; 378 } 379 380 static inline uint32_t syn_swstep(int same_el, int isv, int ex) 381 { 382 return (EC_SOFTWARESTEP << ARM_EL_EC_SHIFT) | (same_el << ARM_EL_EC_SHIFT) 383 | ARM_EL_IL | (isv << 24) | (ex << 6) | 0x22; 384 } 385 386 static inline uint32_t syn_watchpoint(int same_el, int cm, int wnr) 387 { 388 return (EC_WATCHPOINT << ARM_EL_EC_SHIFT) | (same_el << ARM_EL_EC_SHIFT) 389 | ARM_EL_IL | (cm << 8) | (wnr << 6) | 0x22; 390 } 391 392 static inline uint32_t syn_breakpoint(int same_el) 393 { 394 return (EC_BREAKPOINT << ARM_EL_EC_SHIFT) | (same_el << ARM_EL_EC_SHIFT) 395 | ARM_EL_IL | 0x22; 396 } 397 398 static inline uint32_t syn_wfx(int cv, int cond, int ti) 399 { 400 return (EC_WFX_TRAP << ARM_EL_EC_SHIFT) | 401 (cv << 24) | (cond << 20) | ti; 402 } 403 404 /* Update a QEMU watchpoint based on the information the guest has set in the 405 * DBGWCR<n>_EL1 and DBGWVR<n>_EL1 registers. 406 */ 407 void hw_watchpoint_update(ARMCPU *cpu, int n); 408 /* Update the QEMU watchpoints for every guest watchpoint. This does a 409 * complete delete-and-reinstate of the QEMU watchpoint list and so is 410 * suitable for use after migration or on reset. 411 */ 412 void hw_watchpoint_update_all(ARMCPU *cpu); 413 /* Update a QEMU breakpoint based on the information the guest has set in the 414 * DBGBCR<n>_EL1 and DBGBVR<n>_EL1 registers. 415 */ 416 void hw_breakpoint_update(ARMCPU *cpu, int n); 417 /* Update the QEMU breakpoints for every guest breakpoint. This does a 418 * complete delete-and-reinstate of the QEMU breakpoint list and so is 419 * suitable for use after migration or on reset. 420 */ 421 void hw_breakpoint_update_all(ARMCPU *cpu); 422 423 /* Callback function for checking if a watchpoint should trigger. */ 424 bool arm_debug_check_watchpoint(CPUState *cs, CPUWatchpoint *wp); 425 426 /* Adjust addresses (in BE32 mode) before testing against watchpoint 427 * addresses. 428 */ 429 vaddr arm_adjust_watchpoint_address(CPUState *cs, vaddr addr, int len); 430 431 /* Callback function for when a watchpoint or breakpoint triggers. */ 432 void arm_debug_excp_handler(CPUState *cs); 433 434 #ifdef CONFIG_USER_ONLY 435 static inline bool arm_is_psci_call(ARMCPU *cpu, int excp_type) 436 { 437 return false; 438 } 439 #else 440 /* Return true if the r0/x0 value indicates that this SMC/HVC is a PSCI call. */ 441 bool arm_is_psci_call(ARMCPU *cpu, int excp_type); 442 /* Actually handle a PSCI call */ 443 void arm_handle_psci_call(ARMCPU *cpu); 444 #endif 445 446 /** 447 * ARMMMUFaultInfo: Information describing an ARM MMU Fault 448 * @s2addr: Address that caused a fault at stage 2 449 * @stage2: True if we faulted at stage 2 450 * @s1ptw: True if we faulted at stage 2 while doing a stage 1 page-table walk 451 * @ea: True if we should set the EA (external abort type) bit in syndrome 452 */ 453 typedef struct ARMMMUFaultInfo ARMMMUFaultInfo; 454 struct ARMMMUFaultInfo { 455 target_ulong s2addr; 456 bool stage2; 457 bool s1ptw; 458 bool ea; 459 }; 460 461 /* Do a page table walk and add page to TLB if possible */ 462 bool arm_tlb_fill(CPUState *cpu, vaddr address, 463 MMUAccessType access_type, int mmu_idx, 464 uint32_t *fsr, ARMMMUFaultInfo *fi); 465 466 /* Return true if the stage 1 translation regime is using LPAE format page 467 * tables */ 468 bool arm_s1_regime_using_lpae_format(CPUARMState *env, ARMMMUIdx mmu_idx); 469 470 /* Raise a data fault alignment exception for the specified virtual address */ 471 void arm_cpu_do_unaligned_access(CPUState *cs, vaddr vaddr, 472 MMUAccessType access_type, 473 int mmu_idx, uintptr_t retaddr); 474 475 /* Call the EL change hook if one has been registered */ 476 static inline void arm_call_el_change_hook(ARMCPU *cpu) 477 { 478 if (cpu->el_change_hook) { 479 cpu->el_change_hook(cpu, cpu->el_change_hook_opaque); 480 } 481 } 482 483 #endif 484