target-arm/internals.h

   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 /* register banks for CPU modes */
  29 #define BANK_USRSYS 0
  30 #define BANK_SVC    1
  31 #define BANK_ABT    2
  32 #define BANK_UND    3
  33 #define BANK_IRQ    4
  34 #define BANK_FIQ    5
  35 #define BANK_HYP    6
  36 #define BANK_MON    7
  37
  38 static inline bool excp_is_internal(int excp)
  39 {
  40     /* Return true if this exception number represents a QEMU-internal
  41      * exception that will not be passed to the guest.
  42      */
  43     return excp == EXCP_INTERRUPT
  44         || excp == EXCP_HLT
  45         || excp == EXCP_DEBUG
  46         || excp == EXCP_HALTED
  47         || excp == EXCP_EXCEPTION_EXIT
  48         || excp == EXCP_KERNEL_TRAP
  49         || excp == EXCP_SEMIHOST
  50         || excp == EXCP_STREX;
  51 }
  52
  53 /* Exception names for debug logging; note that not all of these
  54  * precisely correspond to architectural exceptions.
  55  */
  56 static const char * const excnames[] = {
  57     [EXCP_UDEF] = "Undefined Instruction",
  58     [EXCP_SWI] = "SVC",
  59     [EXCP_PREFETCH_ABORT] = "Prefetch Abort",
  60     [EXCP_DATA_ABORT] = "Data Abort",
  61     [EXCP_IRQ] = "IRQ",
  62     [EXCP_FIQ] = "FIQ",
  63     [EXCP_BKPT] = "Breakpoint",
  64     [EXCP_EXCEPTION_EXIT] = "QEMU v7M exception exit",
  65     [EXCP_KERNEL_TRAP] = "QEMU intercept of kernel commpage",
  66     [EXCP_STREX] = "QEMU intercept of STREX",
  67     [EXCP_HVC] = "Hypervisor Call",
  68     [EXCP_HYP_TRAP] = "Hypervisor Trap",
  69     [EXCP_SMC] = "Secure Monitor Call",
  70     [EXCP_VIRQ] = "Virtual IRQ",
  71     [EXCP_VFIQ] = "Virtual FIQ",
  72     [EXCP_SEMIHOST] = "Semihosting call",
  73 };
  74
  75 static inline void arm_log_exception(int idx)
  76 {
  77     if (qemu_loglevel_mask(CPU_LOG_INT)) {
  78         const char *exc = NULL;
  79
  80         if (idx >= 0 && idx < ARRAY_SIZE(excnames)) {
  81             exc = excnames[idx];
  82         }
  83         if (!exc) {
  84             exc = "unknown";
  85         }
  86         qemu_log_mask(CPU_LOG_INT, "Taking exception %d [%s]\n", idx, exc);
  87     }
  88 }
  89
  90 /* Scale factor for generic timers, ie number of ns per tick.
  91  * This gives a 62.5MHz timer.
  92  */
  93 #define GTIMER_SCALE 16
  94
  95 /*
  96  * For AArch64, map a given EL to an index in the banked_spsr array.
  97  * Note that this mapping and the AArch32 mapping defined in bank_number()
  98  * must agree such that the AArch64<->AArch32 SPSRs have the architecturally
  99  * mandated mapping between each other.
 100  */
 101 static inline unsigned int aarch64_banked_spsr_index(unsigned int el)
 102 {
 103     static const unsigned int map[4] = {
 104         [1] = BANK_SVC, /* EL1.  */
 105         [2] = BANK_HYP, /* EL2.  */
 106         [3] = BANK_MON, /* EL3.  */
 107     };
 108     assert(el >= 1 && el <= 3);
 109     return map[el];
 110 }
 111
 112 int bank_number(int mode);
 113 void switch_mode(CPUARMState *, int);
 114 void arm_cpu_register_gdb_regs_for_features(ARMCPU *cpu);
 115 void arm_translate_init(void);
 116
 117 enum arm_fprounding {
 118     FPROUNDING_TIEEVEN,
 119     FPROUNDING_POSINF,
 120     FPROUNDING_NEGINF,
 121     FPROUNDING_ZERO,
 122     FPROUNDING_TIEAWAY,
 123     FPROUNDING_ODD
 124 };
 125
 126 int arm_rmode_to_sf(int rmode);
 127
 128 static inline void aarch64_save_sp(CPUARMState *env, int el)
 129 {
 130     if (env->pstate & PSTATE_SP) {
 131         env->sp_el[el] = env->xregs[31];
 132     } else {
 133         env->sp_el[0] = env->xregs[31];
 134     }
 135 }
 136
 137 static inline void aarch64_restore_sp(CPUARMState *env, int el)
 138 {
 139     if (env->pstate & PSTATE_SP) {
 140         env->xregs[31] = env->sp_el[el];
 141     } else {
 142         env->xregs[31] = env->sp_el[0];
 143     }
 144 }
 145
 146 static inline void update_spsel(CPUARMState *env, uint32_t imm)
 147 {
 148     unsigned int cur_el = arm_current_el(env);
 149     /* Update PSTATE SPSel bit; this requires us to update the
 150      * working stack pointer in xregs[31].
 151      */
 152     if (!((imm ^ env->pstate) & PSTATE_SP)) {
 153         return;
 154     }
 155     aarch64_save_sp(env, cur_el);
 156     env->pstate = deposit32(env->pstate, 0, 1, imm);
 157
 158     /* We rely on illegal updates to SPsel from EL0 to get trapped
 159      * at translation time.
 160      */
 161     assert(cur_el >= 1 && cur_el <= 3);
 162     aarch64_restore_sp(env, cur_el);
 163 }
 164
 165 /*
 166  * arm_pamax
 167  * @cpu: ARMCPU
 168  *
 169  * Returns the implementation defined bit-width of physical addresses.
 170  * The ARMv8 reference manuals refer to this as PAMax().
 171  */
 172 static inline unsigned int arm_pamax(ARMCPU *cpu)
 173 {
 174     static const unsigned int pamax_map[] = {
 175         [0] = 32,
 176         [1] = 36,
 177         [2] = 40,
 178         [3] = 42,
 179         [4] = 44,
 180         [5] = 48,
 181     };
 182     unsigned int parange = extract32(cpu->id_aa64mmfr0, 0, 4);
 183
 184     /* id_aa64mmfr0 is a read-only register so values outside of the
 185      * supported mappings can be considered an implementation error.  */
 186     assert(parange < ARRAY_SIZE(pamax_map));
 187     return pamax_map[parange];
 188 }
 189
 190 /* Return true if extended addresses are enabled.
 191  * This is always the case if our translation regime is 64 bit,
 192  * but depends on TTBCR.EAE for 32 bit.
 193  */
 194 static inline bool extended_addresses_enabled(CPUARMState *env)
 195 {
 196     TCR *tcr = &env->cp15.tcr_el[arm_is_secure(env) ? 3 : 1];
 197     return arm_el_is_aa64(env, 1) ||
 198            (arm_feature(env, ARM_FEATURE_LPAE) && (tcr->raw_tcr & TTBCR_EAE));
 199 }
 200
 201 /* Valid Syndrome Register EC field values */
 202 enum arm_exception_class {
 203     EC_UNCATEGORIZED          = 0x00,
 204     EC_WFX_TRAP               = 0x01,
 205     EC_CP15RTTRAP             = 0x03,
 206     EC_CP15RRTTRAP            = 0x04,
 207     EC_CP14RTTRAP             = 0x05,
 208     EC_CP14DTTRAP             = 0x06,
 209     EC_ADVSIMDFPACCESSTRAP    = 0x07,
 210     EC_FPIDTRAP               = 0x08,
 211     EC_CP14RRTTRAP            = 0x0c,
 212     EC_ILLEGALSTATE           = 0x0e,
 213     EC_AA32_SVC               = 0x11,
 214     EC_AA32_HVC               = 0x12,
 215     EC_AA32_SMC               = 0x13,
 216     EC_AA64_SVC               = 0x15,
 217     EC_AA64_HVC               = 0x16,
 218     EC_AA64_SMC               = 0x17,
 219     EC_SYSTEMREGISTERTRAP     = 0x18,
 220     EC_INSNABORT              = 0x20,
 221     EC_INSNABORT_SAME_EL      = 0x21,
 222     EC_PCALIGNMENT            = 0x22,
 223     EC_DATAABORT              = 0x24,
 224     EC_DATAABORT_SAME_EL      = 0x25,
 225     EC_SPALIGNMENT            = 0x26,
 226     EC_AA32_FPTRAP            = 0x28,
 227     EC_AA64_FPTRAP            = 0x2c,
 228     EC_SERROR                 = 0x2f,
 229     EC_BREAKPOINT             = 0x30,
 230     EC_BREAKPOINT_SAME_EL     = 0x31,
 231     EC_SOFTWARESTEP           = 0x32,
 232     EC_SOFTWARESTEP_SAME_EL   = 0x33,
 233     EC_WATCHPOINT             = 0x34,
 234     EC_WATCHPOINT_SAME_EL     = 0x35,
 235     EC_AA32_BKPT              = 0x38,
 236     EC_VECTORCATCH            = 0x3a,
 237     EC_AA64_BKPT              = 0x3c,
 238 };
 239
 240 #define ARM_EL_EC_SHIFT 26
 241 #define ARM_EL_IL_SHIFT 25
 242 #define ARM_EL_IL (1 << ARM_EL_IL_SHIFT)
 243
 244 /* Utility functions for constructing various kinds of syndrome value.
 245  * Note that in general we follow the AArch64 syndrome values; in a
 246  * few cases the value in HSR for exceptions taken to AArch32 Hyp
 247  * mode differs slightly, so if we ever implemented Hyp mode then the
 248  * syndrome value would need some massaging on exception entry.
 249  * (One example of this is that AArch64 defaults to IL bit set for
 250  * exceptions which don't specifically indicate information about the
 251  * trapping instruction, whereas AArch32 defaults to IL bit clear.)
 252  */
 253 static inline uint32_t syn_uncategorized(void)
 254 {
 255     return (EC_UNCATEGORIZED << ARM_EL_EC_SHIFT) | ARM_EL_IL;
 256 }
 257
 258 static inline uint32_t syn_aa64_svc(uint32_t imm16)
 259 {
 260     return (EC_AA64_SVC << ARM_EL_EC_SHIFT) | ARM_EL_IL | (imm16 & 0xffff);
 261 }
 262
 263 static inline uint32_t syn_aa64_hvc(uint32_t imm16)
 264 {
 265     return (EC_AA64_HVC << ARM_EL_EC_SHIFT) | ARM_EL_IL | (imm16 & 0xffff);
 266 }
 267
 268 static inline uint32_t syn_aa64_smc(uint32_t imm16)
 269 {
 270     return (EC_AA64_SMC << ARM_EL_EC_SHIFT) | ARM_EL_IL | (imm16 & 0xffff);
 271 }
 272
 273 static inline uint32_t syn_aa32_svc(uint32_t imm16, bool is_thumb)
 274 {
 275     return (EC_AA32_SVC << ARM_EL_EC_SHIFT) | (imm16 & 0xffff)
 276         | (is_thumb ? 0 : ARM_EL_IL);
 277 }
 278
 279 static inline uint32_t syn_aa32_hvc(uint32_t imm16)
 280 {
 281     return (EC_AA32_HVC << ARM_EL_EC_SHIFT) | ARM_EL_IL | (imm16 & 0xffff);
 282 }
 283
 284 static inline uint32_t syn_aa32_smc(void)
 285 {
 286     return (EC_AA32_SMC << ARM_EL_EC_SHIFT) | ARM_EL_IL;
 287 }
 288
 289 static inline uint32_t syn_aa64_bkpt(uint32_t imm16)
 290 {
 291     return (EC_AA64_BKPT << ARM_EL_EC_SHIFT) | ARM_EL_IL | (imm16 & 0xffff);
 292 }
 293
 294 static inline uint32_t syn_aa32_bkpt(uint32_t imm16, bool is_thumb)
 295 {
 296     return (EC_AA32_BKPT << ARM_EL_EC_SHIFT) | (imm16 & 0xffff)
 297         | (is_thumb ? 0 : ARM_EL_IL);
 298 }
 299
 300 static inline uint32_t syn_aa64_sysregtrap(int op0, int op1, int op2,
 301                                            int crn, int crm, int rt,
 302                                            int isread)
 303 {
 304     return (EC_SYSTEMREGISTERTRAP << ARM_EL_EC_SHIFT) | ARM_EL_IL
 305         | (op0 << 20) | (op2 << 17) | (op1 << 14) | (crn << 10) | (rt << 5)
 306         | (crm << 1) | isread;
 307 }
 308
 309 static inline uint32_t syn_cp14_rt_trap(int cv, int cond, int opc1, int opc2,
 310                                         int crn, int crm, int rt, int isread,
 311                                         bool is_thumb)
 312 {
 313     return (EC_CP14RTTRAP << ARM_EL_EC_SHIFT)
 314         | (is_thumb ? 0 : ARM_EL_IL)
 315         | (cv << 24) | (cond << 20) | (opc2 << 17) | (opc1 << 14)
 316         | (crn << 10) | (rt << 5) | (crm << 1) | isread;
 317 }
 318
 319 static inline uint32_t syn_cp15_rt_trap(int cv, int cond, int opc1, int opc2,
 320                                         int crn, int crm, int rt, int isread,
 321                                         bool is_thumb)
 322 {
 323     return (EC_CP15RTTRAP << ARM_EL_EC_SHIFT)
 324         | (is_thumb ? 0 : ARM_EL_IL)
 325         | (cv << 24) | (cond << 20) | (opc2 << 17) | (opc1 << 14)
 326         | (crn << 10) | (rt << 5) | (crm << 1) | isread;
 327 }
 328
 329 static inline uint32_t syn_cp14_rrt_trap(int cv, int cond, int opc1, int crm,
 330                                          int rt, int rt2, int isread,
 331                                          bool is_thumb)
 332 {
 333     return (EC_CP14RRTTRAP << ARM_EL_EC_SHIFT)
 334         | (is_thumb ? 0 : ARM_EL_IL)
 335         | (cv << 24) | (cond << 20) | (opc1 << 16)
 336         | (rt2 << 10) | (rt << 5) | (crm << 1) | isread;
 337 }
 338
 339 static inline uint32_t syn_cp15_rrt_trap(int cv, int cond, int opc1, int crm,
 340                                          int rt, int rt2, int isread,
 341                                          bool is_thumb)
 342 {
 343     return (EC_CP15RRTTRAP << ARM_EL_EC_SHIFT)
 344         | (is_thumb ? 0 : ARM_EL_IL)
 345         | (cv << 24) | (cond << 20) | (opc1 << 16)
 346         | (rt2 << 10) | (rt << 5) | (crm << 1) | isread;
 347 }
 348
 349 static inline uint32_t syn_fp_access_trap(int cv, int cond, bool is_thumb)
 350 {
 351     return (EC_ADVSIMDFPACCESSTRAP << ARM_EL_EC_SHIFT)
 352         | (is_thumb ? 0 : ARM_EL_IL)
 353         | (cv << 24) | (cond << 20);
 354 }
 355
 356 static inline uint32_t syn_insn_abort(int same_el, int ea, int s1ptw, int fsc)
 357 {
 358     return (EC_INSNABORT << ARM_EL_EC_SHIFT) | (same_el << ARM_EL_EC_SHIFT)
 359         | (ea << 9) | (s1ptw << 7) | fsc;
 360 }
 361
 362 static inline uint32_t syn_data_abort(int same_el, int ea, int cm, int s1ptw,
 363                                       int wnr, int fsc)
 364 {
 365     return (EC_DATAABORT << ARM_EL_EC_SHIFT) | (same_el << ARM_EL_EC_SHIFT)
 366         | (ea << 9) | (cm << 8) | (s1ptw << 7) | (wnr << 6) | fsc;
 367 }
 368
 369 static inline uint32_t syn_swstep(int same_el, int isv, int ex)
 370 {
 371     return (EC_SOFTWARESTEP << ARM_EL_EC_SHIFT) | (same_el << ARM_EL_EC_SHIFT)
 372         | (isv << 24) | (ex << 6) | 0x22;
 373 }
 374
 375 static inline uint32_t syn_watchpoint(int same_el, int cm, int wnr)
 376 {
 377     return (EC_WATCHPOINT << ARM_EL_EC_SHIFT) | (same_el << ARM_EL_EC_SHIFT)
 378         | (cm << 8) | (wnr << 6) | 0x22;
 379 }
 380
 381 static inline uint32_t syn_breakpoint(int same_el)
 382 {
 383     return (EC_BREAKPOINT << ARM_EL_EC_SHIFT) | (same_el << ARM_EL_EC_SHIFT)
 384         | ARM_EL_IL | 0x22;
 385 }
 386
 387 static inline uint32_t syn_wfx(int cv, int cond, int ti)
 388 {
 389     return (EC_WFX_TRAP << ARM_EL_EC_SHIFT) |
 390            (cv << 24) | (cond << 20) | ti;
 391 }
 392
 393 /* Update a QEMU watchpoint based on the information the guest has set in the
 394  * DBGWCR<n>_EL1 and DBGWVR<n>_EL1 registers.
 395  */
 396 void hw_watchpoint_update(ARMCPU *cpu, int n);
 397 /* Update the QEMU watchpoints for every guest watchpoint. This does a
 398  * complete delete-and-reinstate of the QEMU watchpoint list and so is
 399  * suitable for use after migration or on reset.
 400  */
 401 void hw_watchpoint_update_all(ARMCPU *cpu);
 402 /* Update a QEMU breakpoint based on the information the guest has set in the
 403  * DBGBCR<n>_EL1 and DBGBVR<n>_EL1 registers.
 404  */
 405 void hw_breakpoint_update(ARMCPU *cpu, int n);
 406 /* Update the QEMU breakpoints for every guest breakpoint. This does a
 407  * complete delete-and-reinstate of the QEMU breakpoint list and so is
 408  * suitable for use after migration or on reset.
 409  */
 410 void hw_breakpoint_update_all(ARMCPU *cpu);
 411
 412 /* Callback function for when a watchpoint or breakpoint triggers. */
 413 void arm_debug_excp_handler(CPUState *cs);
 414
 415 #ifdef CONFIG_USER_ONLY
 416 static inline bool arm_is_psci_call(ARMCPU *cpu, int excp_type)
 417 {
 418     return false;
 419 }
 420 #else
 421 /* Return true if the r0/x0 value indicates that this SMC/HVC is a PSCI call. */
 422 bool arm_is_psci_call(ARMCPU *cpu, int excp_type);
 423 /* Actually handle a PSCI call */
 424 void arm_handle_psci_call(ARMCPU *cpu);
 425 #endif
 426
 427 /**
 428  * ARMMMUFaultInfo: Information describing an ARM MMU Fault
 429  * @s2addr: Address that caused a fault at stage 2
 430  * @stage2: True if we faulted at stage 2
 431  * @s1ptw: True if we faulted at stage 2 while doing a stage 1 page-table walk
 432  */
 433 typedef struct ARMMMUFaultInfo ARMMMUFaultInfo;
 434 struct ARMMMUFaultInfo {
 435     target_ulong s2addr;
 436     bool stage2;
 437     bool s1ptw;
 438 };
 439
 440 /* Do a page table walk and add page to TLB if possible */
 441 bool arm_tlb_fill(CPUState *cpu, vaddr address, int rw, int mmu_idx,
 442                   uint32_t *fsr, ARMMMUFaultInfo *fi);
 443
 444 #endif