sys/powerpc/powerpc/trap.c

   1 /*-
   2  * Copyright (C) 1995, 1996 Wolfgang Solfrank.
   3  * Copyright (C) 1995, 1996 TooLs GmbH.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. All advertising materials mentioning features or use of this software
  15  *    must display the following acknowledgement:
  16  *      This product includes software developed by TooLs GmbH.
  17  * 4. The name of TooLs GmbH may not be used to endorse or promote products
  18  *    derived from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
  21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  23  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  26  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  27  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  28  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  29  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  *
  31  * $NetBSD: trap.c,v 1.58 2002/03/04 04:07:35 dbj Exp $
  32  */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 #include <sys/param.h>
  38 #include <sys/kdb.h>
  39 #include <sys/proc.h>
  40 #include <sys/ktr.h>
  41 #include <sys/lock.h>
  42 #include <sys/mutex.h>
  43 #include <sys/ptrace.h>
  44 #include <sys/reboot.h>
  45 #include <sys/syscall.h>
  46 #include <sys/sysent.h>
  47 #include <sys/systm.h>
  48 #include <sys/kernel.h>
  49 #include <sys/uio.h>
  50 #include <sys/signalvar.h>
  51 #include <sys/vmmeter.h>
  52
  53 #include <security/audit/audit.h>
  54
  55 #include <vm/vm.h>
  56 #include <vm/pmap.h>
  57 #include <vm/vm_extern.h>
  58 #include <vm/vm_param.h>
  59 #include <vm/vm_kern.h>
  60 #include <vm/vm_map.h>
  61 #include <vm/vm_page.h>
  62
  63 #include <machine/_inttypes.h>
  64 #include <machine/altivec.h>
  65 #include <machine/cpu.h>
  66 #include <machine/db_machdep.h>
  67 #include <machine/fpu.h>
  68 #include <machine/frame.h>
  69 #include <machine/pcb.h>
  70 #include <machine/psl.h>
  71 #include <machine/slb.h>
  72 #include <machine/spr.h>
  73 #include <machine/sr.h>
  74 #include <machine/trap.h>
  75
  76 /* Below matches setjmp.S */
  77 #define FAULTBUF_LR     21
  78 #define FAULTBUF_R1     1
  79 #define FAULTBUF_R2     2
  80 #define FAULTBUF_CR     22
  81 #define FAULTBUF_R14    3
  82
  83 #define MOREARGS(sp)    ((caddr_t)((uintptr_t)(sp) + \
  84     sizeof(struct callframe) - 3*sizeof(register_t))) /* more args go here */
  85
  86 static void     trap_fatal(struct trapframe *frame);
  87 static void     printtrap(u_int vector, struct trapframe *frame, int isfatal,
  88                     int user);
  89 static bool     trap_pfault(struct trapframe *frame, bool user, int *signo,
  90                     int *ucode);
  91 static int      fix_unaligned(struct thread *td, struct trapframe *frame);
  92 static int      handle_onfault(struct trapframe *frame);
  93 static void     syscall(struct trapframe *frame);
  94
  95 #if defined(__powerpc64__) && defined(AIM)
  96 static void     normalize_inputs(void);
  97 #endif
  98
  99 extern vm_offset_t __startkernel;
 100
 101 extern int      copy_fault(void);
 102 extern int      fusufault(void);
 103
 104 #ifdef KDB
 105 int db_trap_glue(struct trapframe *);           /* Called from trap_subr.S */
 106 #endif
 107
 108 struct powerpc_exception {
 109         u_int   vector;
 110         char    *name;
 111 };
 112
 113 #ifdef KDTRACE_HOOKS
 114 #include <sys/dtrace_bsd.h>
 115
 116 int (*dtrace_invop_jump_addr)(struct trapframe *);
 117 #endif
 118
 119 static struct powerpc_exception powerpc_exceptions[] = {
 120         { EXC_CRIT,     "critical input" },
 121         { EXC_RST,      "system reset" },
 122         { EXC_MCHK,     "machine check" },
 123         { EXC_DSI,      "data storage interrupt" },
 124         { EXC_DSE,      "data segment exception" },
 125         { EXC_ISI,      "instruction storage interrupt" },
 126         { EXC_ISE,      "instruction segment exception" },
 127         { EXC_EXI,      "external interrupt" },
 128         { EXC_ALI,      "alignment" },
 129         { EXC_PGM,      "program" },
 130         { EXC_HEA,      "hypervisor emulation assistance" },
 131         { EXC_FPU,      "floating-point unavailable" },
 132         { EXC_APU,      "auxiliary proc unavailable" },
 133         { EXC_DECR,     "decrementer" },
 134         { EXC_FIT,      "fixed-interval timer" },
 135         { EXC_WDOG,     "watchdog timer" },
 136         { EXC_SC,       "system call" },
 137         { EXC_TRC,      "trace" },
 138         { EXC_FPA,      "floating-point assist" },
 139         { EXC_DEBUG,    "debug" },
 140         { EXC_PERF,     "performance monitoring" },
 141         { EXC_VEC,      "altivec unavailable" },
 142         { EXC_VSX,      "vsx unavailable" },
 143         { EXC_FAC,      "facility unavailable" },
 144         { EXC_ITMISS,   "instruction tlb miss" },
 145         { EXC_DLMISS,   "data load tlb miss" },
 146         { EXC_DSMISS,   "data store tlb miss" },
 147         { EXC_BPT,      "instruction breakpoint" },
 148         { EXC_SMI,      "system management" },
 149         { EXC_VECAST_G4,        "altivec assist" },
 150         { EXC_THRM,     "thermal management" },
 151         { EXC_RUNMODETRC,       "run mode/trace" },
 152         { EXC_SOFT_PATCH, "soft patch exception" },
 153         { EXC_LAST,     NULL }
 154 };
 155
 156 static int uprintf_signal;
 157 SYSCTL_INT(_machdep, OID_AUTO, uprintf_signal, CTLFLAG_RWTUN,
 158     &uprintf_signal, 0,
 159     "Print debugging information on trap signal to ctty");
 160
 161 #define ESR_BITMASK                                                     \
 162     "\20"                                                               \
 163     "\040b0\037b1\036b2\035b3\034PIL\033PRR\032PTR\031FP"               \
 164     "\030ST\027b9\026DLK\025ILK\024b12\023b13\022BO\021PIE"             \
 165     "\020b16\017b17\016b18\015b19\014b20\013b21\012b22\011b23"          \
 166     "\010SPE\007EPID\006b26\005b27\004b28\003b29\002b30\001b31"
 167 #define MCSR_BITMASK                                                    \
 168     "\20"                                                               \
 169     "\040MCP\037ICERR\036DCERR\035TLBPERR\034L2MMU_MHIT\033b5\032b6\031b7"      \
 170     "\030b8\027b9\026b10\025NMI\024MAV\023MEA\022b14\021IF"             \
 171     "\020LD\017ST\016LDG\015b19\014b20\013b21\012b22\011b23"            \
 172     "\010b24\007b25\006b26\005b27\004b28\003b29\002TLBSYNC\001BSL2_ERR"
 173 #define MSSSR_BITMASK                                                   \
 174     "\20"                                                               \
 175     "\040b0\037b1\036b2\035b3\034b4\033b5\032b6\031b7"                  \
 176     "\030b8\027b9\026b10\025b11\024b12\023L2TAG\022L2DAT\021L3TAG"      \
 177     "\020L3DAT\017APE\016DPE\015TEA\014b20\013b21\012b22\011b23"        \
 178     "\010b24\007b25\006b26\005b27\004b28\003b29\002b30\001b31"
 179
 180 static const char *
 181 trapname(u_int vector)
 182 {
 183         struct  powerpc_exception *pe;
 184
 185         for (pe = powerpc_exceptions; pe->vector != EXC_LAST; pe++) {
 186                 if (pe->vector == vector)
 187                         return (pe->name);
 188         }
 189
 190         return ("unknown");
 191 }
 192
 193 static inline bool
 194 frame_is_trap_inst(struct trapframe *frame)
 195 {
 196 #ifdef AIM
 197         return (frame->exc == EXC_PGM && frame->srr1 & EXC_PGM_TRAP);
 198 #else
 199         return ((frame->cpu.booke.esr & ESR_PTR) != 0);
 200 #endif
 201 }
 202
 203 void
 204 trap(struct trapframe *frame)
 205 {
 206         struct thread   *td;
 207         struct proc     *p;
 208 #ifdef KDTRACE_HOOKS
 209         uint32_t inst;
 210 #endif
 211         int             sig, type, user;
 212         u_int           ucode;
 213         ksiginfo_t      ksi;
 214         register_t      addr, fscr;
 215
 216         VM_CNT_INC(v_trap);
 217
 218 #ifdef KDB
 219         if (kdb_active) {
 220                 kdb_reenter();
 221                 return;
 222         }
 223 #endif
 224
 225         td = curthread;
 226         p = td->td_proc;
 227
 228         type = ucode = frame->exc;
 229         sig = 0;
 230         user = frame->srr1 & PSL_PR;
 231         addr = 0;
 232
 233         CTR3(KTR_TRAP, "trap: %s type=%s (%s)", td->td_name,
 234             trapname(type), user ? "user" : "kernel");
 235
 236 #ifdef KDTRACE_HOOKS
 237         /*
 238          * A trap can occur while DTrace executes a probe. Before
 239          * executing the probe, DTrace blocks re-scheduling and sets
 240          * a flag in its per-cpu flags to indicate that it doesn't
 241          * want to fault. On returning from the probe, the no-fault
 242          * flag is cleared and finally re-scheduling is enabled.
 243          *
 244          * If the DTrace kernel module has registered a trap handler,
 245          * call it and if it returns non-zero, assume that it has
 246          * handled the trap and modified the trap frame so that this
 247          * function can return normally.
 248          */
 249         if (dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, type) != 0)
 250                 return;
 251 #endif
 252
 253         if (user) {
 254                 td->td_pticks = 0;
 255                 td->td_frame = frame;
 256                 addr = frame->srr0;
 257                 if (td->td_cowgen != p->p_cowgen)
 258                         thread_cow_update(td);
 259
 260                 /* User Mode Traps */
 261                 switch (type) {
 262                 case EXC_RUNMODETRC:
 263                 case EXC_TRC:
 264                         frame->srr1 &= ~PSL_SE;
 265                         sig = SIGTRAP;
 266                         ucode = TRAP_TRACE;
 267                         break;
 268
 269 #if defined(__powerpc64__) && defined(AIM)
 270                 case EXC_DSE:
 271                         addr = frame->dar;
 272                         /* FALLTHROUGH */
 273                 case EXC_ISE:
 274                         /* DSE/ISE are automatically fatal with radix pmap. */
 275                         if (radix_mmu ||
 276                             handle_user_slb_spill(&p->p_vmspace->vm_pmap,
 277                             addr) != 0){
 278                                 sig = SIGSEGV;
 279                                 ucode = SEGV_MAPERR;
 280                         }
 281                         break;
 282 #endif
 283                 case EXC_DSI:
 284                         addr = frame->dar;
 285                         /* FALLTHROUGH */
 286                 case EXC_ISI:
 287                         if (trap_pfault(frame, true, &sig, &ucode))
 288                                 sig = 0;
 289                         break;
 290
 291                 case EXC_SC:
 292                         syscall(frame);
 293                         break;
 294
 295                 case EXC_FPU:
 296                         KASSERT((td->td_pcb->pcb_flags & PCB_FPU) != PCB_FPU,
 297                             ("FPU already enabled for thread"));
 298                         enable_fpu(td);
 299                         break;
 300
 301                 case EXC_VEC:
 302                         KASSERT((td->td_pcb->pcb_flags & PCB_VEC) != PCB_VEC,
 303                             ("Altivec already enabled for thread"));
 304                         enable_vec(td);
 305                         break;
 306
 307                 case EXC_VSX:
 308                         KASSERT((td->td_pcb->pcb_flags & PCB_VSX) != PCB_VSX,
 309                             ("VSX already enabled for thread"));
 310                         if (!(td->td_pcb->pcb_flags & PCB_VEC))
 311                                 enable_vec(td);
 312                         if (td->td_pcb->pcb_flags & PCB_FPU)
 313                                 save_fpu(td);
 314                         td->td_pcb->pcb_flags |= PCB_VSX;
 315                         enable_fpu(td);
 316                         break;
 317
 318                 case EXC_FAC:
 319                         fscr = mfspr(SPR_FSCR);
 320                         switch (fscr & FSCR_IC_MASK) {
 321                         case FSCR_IC_HTM:
 322                                 CTR0(KTR_TRAP,
 323                                     "Hardware Transactional Memory subsystem disabled");
 324                                 sig = SIGILL;
 325                                 ucode = ILL_ILLOPC;
 326                                 break;
 327                         case FSCR_IC_DSCR:
 328                                 td->td_pcb->pcb_flags |= PCB_CFSCR | PCB_CDSCR;
 329                                 fscr |= FSCR_DSCR;
 330                                 mtspr(SPR_DSCR, 0);
 331                                 break;
 332                         case FSCR_IC_EBB:
 333                                 td->td_pcb->pcb_flags |= PCB_CFSCR;
 334                                 fscr |= FSCR_EBB;
 335                                 mtspr(SPR_EBBHR, 0);
 336                                 mtspr(SPR_EBBRR, 0);
 337                                 mtspr(SPR_BESCR, 0);
 338                                 break;
 339                         case FSCR_IC_TAR:
 340                                 td->td_pcb->pcb_flags |= PCB_CFSCR;
 341                                 fscr |= FSCR_TAR;
 342                                 mtspr(SPR_TAR, 0);
 343                                 break;
 344                         case FSCR_IC_LM:
 345                                 td->td_pcb->pcb_flags |= PCB_CFSCR;
 346                                 fscr |= FSCR_LM;
 347                                 mtspr(SPR_LMRR, 0);
 348                                 mtspr(SPR_LMSER, 0);
 349                                 break;
 350                         default:
 351                                 sig = SIGILL;
 352                                 ucode = ILL_ILLOPC;
 353                         }
 354                         mtspr(SPR_FSCR, fscr & ~FSCR_IC_MASK);
 355                         break;
 356                 case EXC_HEA:
 357                         sig = SIGILL;
 358                         ucode = ILL_ILLOPC;
 359                         break;
 360
 361                 case EXC_VECAST_E:
 362                 case EXC_VECAST_G4:
 363                 case EXC_VECAST_G5:
 364                         /*
 365                          * We get a VPU assist exception for IEEE mode
 366                          * vector operations on denormalized floats.
 367                          * Emulating this is a giant pain, so for now,
 368                          * just switch off IEEE mode and treat them as
 369                          * zero.
 370                          */
 371
 372                         save_vec(td);
 373                         td->td_pcb->pcb_vec.vscr |= ALTIVEC_VSCR_NJ;
 374                         enable_vec(td);
 375                         break;
 376
 377                 case EXC_ALI:
 378                         if (fix_unaligned(td, frame) != 0) {
 379                                 sig = SIGBUS;
 380                                 ucode = BUS_ADRALN;
 381                                 addr = frame->dar;
 382                         }
 383                         else
 384                                 frame->srr0 += 4;
 385                         break;
 386
 387                 case EXC_DEBUG: /* Single stepping */
 388                         mtspr(SPR_DBSR, mfspr(SPR_DBSR));
 389                         frame->srr1 &= ~PSL_DE;
 390                         frame->cpu.booke.dbcr0 &= ~(DBCR0_IDM | DBCR0_IC);
 391                         sig = SIGTRAP;
 392                         ucode = TRAP_TRACE;
 393                         break;
 394
 395                 case EXC_PGM:
 396                         /* Identify the trap reason */
 397                         if (frame_is_trap_inst(frame)) {
 398 #ifdef KDTRACE_HOOKS
 399                                 inst = fuword32((const void *)frame->srr0);
 400                                 if (inst == 0x0FFFDDDD &&
 401                                     dtrace_pid_probe_ptr != NULL) {
 402                                         (*dtrace_pid_probe_ptr)(frame);
 403                                         break;
 404                                 }
 405 #endif
 406                                 sig = SIGTRAP;
 407                                 ucode = TRAP_BRKPT;
 408                                 break;
 409                         }
 410
 411                         if ((frame->srr1 & EXC_PGM_FPENABLED) &&
 412                              (td->td_pcb->pcb_flags & PCB_FPU))
 413                                 sig = SIGFPE;
 414                         else
 415                                 sig = ppc_instr_emulate(frame, td);
 416
 417                         if (sig == SIGILL) {
 418                                 if (frame->srr1 & EXC_PGM_PRIV)
 419                                         ucode = ILL_PRVOPC;
 420                                 else if (frame->srr1 & EXC_PGM_ILLEGAL)
 421                                         ucode = ILL_ILLOPC;
 422                         } else if (sig == SIGFPE) {
 423                                 ucode = get_fpu_exception(td);
 424                         }
 425
 426                         break;
 427
 428                 case EXC_MCHK:
 429                         sig = cpu_machine_check(td, frame, &ucode);
 430                         printtrap(frame->exc, frame, 0, (frame->srr1 & PSL_PR));
 431                         break;
 432
 433 #if defined(__powerpc64__) && defined(AIM)
 434                 case EXC_SOFT_PATCH:
 435                         /*
 436                          * Point to the instruction that generated the exception to execute it again,
 437                          * and normalize the register values.
 438                          */
 439                         frame->srr0 -= 4;
 440                         normalize_inputs();
 441                         break;
 442 #endif
 443
 444                 default:
 445                         trap_fatal(frame);
 446                 }
 447         } else {
 448                 /* Kernel Mode Traps */
 449
 450                 KASSERT(cold || td->td_ucred != NULL,
 451                     ("kernel trap doesn't have ucred"));
 452                 switch (type) {
 453                 case EXC_PGM:
 454 #ifdef KDTRACE_HOOKS
 455                         if (frame_is_trap_inst(frame)) {
 456                                 if (*(uint32_t *)frame->srr0 == EXC_DTRACE) {
 457                                         if (dtrace_invop_jump_addr != NULL) {
 458                                                 dtrace_invop_jump_addr(frame);
 459                                                 return;
 460                                         }
 461                                 }
 462                         }
 463 #endif
 464 #ifdef KDB
 465                         if (db_trap_glue(frame))
 466                                 return;
 467 #endif
 468                         break;
 469 #if defined(__powerpc64__) && defined(AIM)
 470                 case EXC_DSE:
 471                         /* DSE on radix mmu is automatically fatal. */
 472                         if (radix_mmu)
 473                                 break;
 474                         if (td->td_pcb->pcb_cpu.aim.usr_vsid != 0 &&
 475                             (frame->dar & SEGMENT_MASK) == USER_ADDR) {
 476                                 __asm __volatile ("slbmte %0, %1" ::
 477                                         "r"(td->td_pcb->pcb_cpu.aim.usr_vsid),
 478                                         "r"(USER_SLB_SLBE));
 479                                 return;
 480                         }
 481                         break;
 482 #endif
 483                 case EXC_DSI:
 484                         if (trap_pfault(frame, false, NULL, NULL))
 485                                 return;
 486                         break;
 487                 case EXC_MCHK:
 488                         if (handle_onfault(frame))
 489                                 return;
 490                         break;
 491                 default:
 492                         break;
 493                 }
 494                 trap_fatal(frame);
 495         }
 496
 497         if (sig != 0) {
 498                 if (p->p_sysent->sv_transtrap != NULL)
 499                         sig = (p->p_sysent->sv_transtrap)(sig, type);
 500                 ksiginfo_init_trap(&ksi);
 501                 ksi.ksi_signo = sig;
 502                 ksi.ksi_code = (int) ucode; /* XXX, not POSIX */
 503                 ksi.ksi_addr = (void *)addr;
 504                 ksi.ksi_trapno = type;
 505                 if (uprintf_signal) {
 506                         uprintf("pid %d comm %s: signal %d code %d type 0x%x "
 507                                 "addr 0x%lx r1 0x%lx srr0 0x%lx srr1 0x%lx\n",
 508                                 p->p_pid, p->p_comm, sig, ucode, type,
 509                                 (u_long)addr, (u_long)frame->fixreg[1],
 510                                 (u_long)frame->srr0, (u_long)frame->srr1);
 511                 }
 512
 513                 trapsignal(td, &ksi);
 514         }
 515
 516         userret(td, frame);
 517 }
 518
 519 static void
 520 trap_fatal(struct trapframe *frame)
 521 {
 522 #ifdef KDB
 523         bool handled;
 524 #endif
 525
 526         printtrap(frame->exc, frame, 1, (frame->srr1 & PSL_PR));
 527 #ifdef KDB
 528         if (debugger_on_trap) {
 529                 kdb_why = KDB_WHY_TRAP;
 530                 handled = kdb_trap(frame->exc, 0, frame);
 531                 kdb_why = KDB_WHY_UNSET;
 532                 if (handled)
 533                         return;
 534         }
 535 #endif
 536         panic("%s trap", trapname(frame->exc));
 537 }
 538
 539 static void
 540 cpu_printtrap(u_int vector, struct trapframe *frame, int isfatal, int user)
 541 {
 542 #ifdef AIM
 543         uint16_t ver;
 544
 545         switch (vector) {
 546         case EXC_MCHK:
 547                 ver = mfpvr() >> 16;
 548                 if (MPC745X_P(ver))
 549                         printf("    msssr0         = 0x%b\n",
 550                             (int)mfspr(SPR_MSSSR0), MSSSR_BITMASK);
 551         case EXC_DSE:
 552         case EXC_DSI:
 553         case EXC_DTMISS:
 554                 printf("   dsisr           = 0x%lx\n",
 555                     (u_long)frame->cpu.aim.dsisr);
 556                 break;
 557         }
 558 #elif defined(BOOKE)
 559         vm_paddr_t pa;
 560
 561         switch (vector) {
 562         case EXC_MCHK:
 563                 pa = mfspr(SPR_MCARU);
 564                 pa = (pa << 32) | (u_register_t)mfspr(SPR_MCAR);
 565                 printf("   mcsr            = 0x%b\n",
 566                     (int)mfspr(SPR_MCSR), MCSR_BITMASK);
 567                 printf("   mcar            = 0x%jx\n", (uintmax_t)pa);
 568         }
 569         printf("   esr             = 0x%b\n",
 570             (int)frame->cpu.booke.esr, ESR_BITMASK);
 571 #endif
 572 }
 573
 574 static void
 575 printtrap(u_int vector, struct trapframe *frame, int isfatal, int user)
 576 {
 577
 578         printf("\n");
 579         printf("%s %s trap:\n", isfatal ? "fatal" : "handled",
 580             user ? "user" : "kernel");
 581         printf("\n");
 582         printf("   exception       = 0x%x (%s)\n", vector, trapname(vector));
 583         switch (vector) {
 584         case EXC_DSE:
 585         case EXC_DSI:
 586         case EXC_DTMISS:
 587         case EXC_ALI:
 588         case EXC_MCHK:
 589                 printf("   virtual address = 0x%" PRIxPTR "\n", frame->dar);
 590                 break;
 591         case EXC_ISE:
 592         case EXC_ISI:
 593         case EXC_ITMISS:
 594                 printf("   virtual address = 0x%" PRIxPTR "\n", frame->srr0);
 595                 break;
 596         }
 597         cpu_printtrap(vector, frame, isfatal, user);
 598         printf("   srr0            = 0x%" PRIxPTR " (0x%" PRIxPTR ")\n",
 599             frame->srr0, frame->srr0 - (register_t)(__startkernel - KERNBASE));
 600         printf("   srr1            = 0x%lx\n", (u_long)frame->srr1);
 601         printf("   current msr     = 0x%" PRIxPTR "\n", mfmsr());
 602         printf("   lr              = 0x%" PRIxPTR " (0x%" PRIxPTR ")\n",
 603             frame->lr, frame->lr - (register_t)(__startkernel - KERNBASE));
 604         printf("   frame           = %p\n", frame);
 605         printf("   curthread       = %p\n", curthread);
 606         if (curthread != NULL)
 607                 printf("          pid = %d, comm = %s\n",
 608                     curthread->td_proc->p_pid, curthread->td_name);
 609         printf("\n");
 610 }
 611
 612 /*
 613  * Handles a fatal fault when we have onfault state to recover.  Returns
 614  * non-zero if there was onfault recovery state available.
 615  */
 616 static int
 617 handle_onfault(struct trapframe *frame)
 618 {
 619         struct          thread *td;
 620         jmp_buf         *fb;
 621
 622         td = curthread;
 623 #if defined(__powerpc64__) || defined(BOOKE)
 624         uintptr_t dispatch = (uintptr_t)td->td_pcb->pcb_onfault;
 625
 626         if (dispatch == 0)
 627                 return (0);
 628         /* Short-circuit radix and Book-E paths. */
 629         switch (dispatch) {
 630                 case COPYFAULT:
 631                         frame->srr0 = (uintptr_t)copy_fault;
 632                         return (1);
 633                 case FUSUFAULT:
 634                         frame->srr0 = (uintptr_t)fusufault;
 635                         return (1);
 636                 default:
 637                         break;
 638         }
 639 #endif
 640         fb = td->td_pcb->pcb_onfault;
 641         if (fb != NULL) {
 642                 frame->srr0 = (*fb)->_jb[FAULTBUF_LR];
 643                 frame->fixreg[1] = (*fb)->_jb[FAULTBUF_R1];
 644                 frame->fixreg[2] = (*fb)->_jb[FAULTBUF_R2];
 645                 frame->fixreg[3] = 1;
 646                 frame->cr = (*fb)->_jb[FAULTBUF_CR];
 647                 bcopy(&(*fb)->_jb[FAULTBUF_R14], &frame->fixreg[14],
 648                     18 * sizeof(register_t));
 649                 td->td_pcb->pcb_onfault = NULL; /* Returns twice, not thrice */
 650                 return (1);
 651         }
 652         return (0);
 653 }
 654
 655 int
 656 cpu_fetch_syscall_args(struct thread *td)
 657 {
 658         struct proc *p;
 659         struct trapframe *frame;
 660         struct syscall_args *sa;
 661         caddr_t params;
 662         size_t argsz;
 663         int error, n, narg, i;
 664
 665         p = td->td_proc;
 666         frame = td->td_frame;
 667         sa = &td->td_sa;
 668
 669         sa->code = frame->fixreg[0];
 670         sa->original_code = sa->code;
 671         params = (caddr_t)(frame->fixreg + FIRSTARG);
 672         n = NARGREG;
 673
 674         if (sa->code == SYS_syscall) {
 675                 /*
 676                  * code is first argument,
 677                  * followed by actual args.
 678                  */
 679                 sa->code = *(register_t *) params;
 680                 params += sizeof(register_t);
 681                 n -= 1;
 682         } else if (sa->code == SYS___syscall) {
 683                 /*
 684                  * Like syscall, but code is a quad,
 685                  * so as to maintain quad alignment
 686                  * for the rest of the args.
 687                  */
 688                 if (SV_PROC_FLAG(p, SV_ILP32)) {
 689                         params += sizeof(register_t);
 690                         sa->code = *(register_t *) params;
 691                         params += sizeof(register_t);
 692                         n -= 2;
 693                 } else {
 694                         sa->code = *(register_t *) params;
 695                         params += sizeof(register_t);
 696                         n -= 1;
 697                 }
 698         }
 699
 700         if (sa->code >= p->p_sysent->sv_size)
 701                 sa->callp = &p->p_sysent->sv_table[0];
 702         else
 703                 sa->callp = &p->p_sysent->sv_table[sa->code];
 704
 705         narg = sa->callp->sy_narg;
 706
 707         if (SV_PROC_FLAG(p, SV_ILP32)) {
 708                 argsz = sizeof(uint32_t);
 709
 710                 for (i = 0; i < n; i++)
 711                         sa->args[i] = ((u_register_t *)(params))[i] &
 712                             0xffffffff;
 713         } else {
 714                 argsz = sizeof(uint64_t);
 715
 716                 for (i = 0; i < n; i++)
 717                         sa->args[i] = ((u_register_t *)(params))[i];
 718         }
 719
 720         if (narg > n)
 721                 error = copyin(MOREARGS(frame->fixreg[1]), sa->args + n,
 722                                (narg - n) * argsz);
 723         else
 724                 error = 0;
 725
 726 #ifdef __powerpc64__
 727         if (SV_PROC_FLAG(p, SV_ILP32) && narg > n) {
 728                 /* Expand the size of arguments copied from the stack */
 729
 730                 for (i = narg; i >= n; i--)
 731                         sa->args[i] = ((uint32_t *)(&sa->args[n]))[i-n];
 732         }
 733 #endif
 734
 735         if (error == 0) {
 736                 td->td_retval[0] = 0;
 737                 td->td_retval[1] = frame->fixreg[FIRSTARG + 1];
 738         }
 739         return (error);
 740 }
 741
 742 #include "../../kern/subr_syscall.c"
 743
 744 void
 745 syscall(struct trapframe *frame)
 746 {
 747         struct thread *td;
 748
 749         td = curthread;
 750         td->td_frame = frame;
 751
 752 #if defined(__powerpc64__) && defined(AIM)
 753         /*
 754          * Speculatively restore last user SLB segment, which we know is
 755          * invalid already, since we are likely to do copyin()/copyout().
 756          */
 757         if (td->td_pcb->pcb_cpu.aim.usr_vsid != 0)
 758                 __asm __volatile ("slbmte %0, %1; isync" ::
 759                     "r"(td->td_pcb->pcb_cpu.aim.usr_vsid), "r"(USER_SLB_SLBE));
 760 #endif
 761
 762         syscallenter(td);
 763         syscallret(td);
 764 }
 765
 766 static bool
 767 trap_pfault(struct trapframe *frame, bool user, int *signo, int *ucode)
 768 {
 769         vm_offset_t     eva;
 770         struct          thread *td;
 771         struct          proc *p;
 772         vm_map_t        map;
 773         vm_prot_t       ftype;
 774         int             rv, is_user;
 775
 776         td = curthread;
 777         p = td->td_proc;
 778         if (frame->exc == EXC_ISI) {
 779                 eva = frame->srr0;
 780                 ftype = VM_PROT_EXECUTE;
 781                 if (frame->srr1 & SRR1_ISI_PFAULT)
 782                         ftype |= VM_PROT_READ;
 783         } else {
 784                 eva = frame->dar;
 785 #ifdef BOOKE
 786                 if (frame->cpu.booke.esr & ESR_ST)
 787 #else
 788                 if (frame->cpu.aim.dsisr & DSISR_STORE)
 789 #endif
 790                         ftype = VM_PROT_WRITE;
 791                 else
 792                         ftype = VM_PROT_READ;
 793         }
 794 #if defined(__powerpc64__) && defined(AIM)
 795         if (radix_mmu && pmap_nofault(&p->p_vmspace->vm_pmap, eva, ftype) == 0)
 796                 return (true);
 797 #endif
 798
 799         if (__predict_false((td->td_pflags & TDP_NOFAULTING) == 0)) {
 800                 /*
 801                  * If we get a page fault while in a critical section, then
 802                  * it is most likely a fatal kernel page fault.  The kernel
 803                  * is already going to panic trying to get a sleep lock to
 804                  * do the VM lookup, so just consider it a fatal trap so the
 805                  * kernel can print out a useful trap message and even get
 806                  * to the debugger.
 807                  *
 808                  * If we get a page fault while holding a non-sleepable
 809                  * lock, then it is most likely a fatal kernel page fault.
 810                  * If WITNESS is enabled, then it's going to whine about
 811                  * bogus LORs with various VM locks, so just skip to the
 812                  * fatal trap handling directly.
 813                  */
 814                 if (td->td_critnest != 0 ||
 815                         WITNESS_CHECK(WARN_SLEEPOK | WARN_GIANTOK, NULL,
 816                                 "Kernel page fault") != 0) {
 817                         trap_fatal(frame);
 818                         return (false);
 819                 }
 820         }
 821         if (user) {
 822                 KASSERT(p->p_vmspace != NULL, ("trap_pfault: vmspace  NULL"));
 823                 map = &p->p_vmspace->vm_map;
 824         } else {
 825                 rv = pmap_decode_kernel_ptr(eva, &is_user, &eva);
 826                 if (rv != 0)
 827                         return (false);
 828
 829                 if (is_user)
 830                         map = &p->p_vmspace->vm_map;
 831                 else
 832                         map = kernel_map;
 833         }
 834
 835         /* Fault in the page. */
 836         rv = vm_fault_trap(map, eva, ftype, VM_FAULT_NORMAL, signo, ucode);
 837         /*
 838          * XXXDTRACE: add dtrace_doubletrap_func here?
 839          */
 840
 841         if (rv == KERN_SUCCESS)
 842                 return (true);
 843
 844         if (!user && handle_onfault(frame))
 845                 return (true);
 846
 847         return (false);
 848 }
 849
 850 /*
 851  * For now, this only deals with the particular unaligned access case
 852  * that gcc tends to generate.  Eventually it should handle all of the
 853  * possibilities that can happen on a 32-bit PowerPC in big-endian mode.
 854  */
 855
 856 static int
 857 fix_unaligned(struct thread *td, struct trapframe *frame)
 858 {
 859         struct thread   *fputhread;
 860 #ifdef BOOKE
 861         uint32_t        inst;
 862 #endif
 863         int             indicator, reg;
 864         double          *fpr;
 865
 866 #ifdef __SPE__
 867         indicator = (frame->cpu.booke.esr & (ESR_ST|ESR_SPE));
 868         if (indicator & ESR_SPE) {
 869                 if (copyin((void *)frame->srr0, &inst, sizeof(inst)) != 0)
 870                         return (-1);
 871                 reg = EXC_ALI_INST_RST(inst);
 872                 fpr = (double *)td->td_pcb->pcb_vec.vr[reg];
 873                 fputhread = PCPU_GET(vecthread);
 874
 875                 /* Juggle the SPE to ensure that we've initialized
 876                  * the registers, and that their current state is in
 877                  * the PCB.
 878                  */
 879                 if (fputhread != td) {
 880                         if (fputhread)
 881                                 save_vec(fputhread);
 882                         enable_vec(td);
 883                 }
 884                 save_vec(td);
 885
 886                 if (!(indicator & ESR_ST)) {
 887                         if (copyin((void *)frame->dar, fpr,
 888                             sizeof(double)) != 0)
 889                                 return (-1);
 890                         frame->fixreg[reg] = td->td_pcb->pcb_vec.vr[reg][1];
 891                         enable_vec(td);
 892                 } else {
 893                         td->td_pcb->pcb_vec.vr[reg][1] = frame->fixreg[reg];
 894                         if (copyout(fpr, (void *)frame->dar,
 895                             sizeof(double)) != 0)
 896                                 return (-1);
 897                 }
 898                 return (0);
 899         }
 900 #else
 901 #ifdef BOOKE
 902         indicator = (frame->cpu.booke.esr & ESR_ST) ? EXC_ALI_STFD : EXC_ALI_LFD;
 903 #else
 904         indicator = EXC_ALI_OPCODE_INDICATOR(frame->cpu.aim.dsisr);
 905 #endif
 906
 907         switch (indicator) {
 908         case EXC_ALI_LFD:
 909         case EXC_ALI_STFD:
 910 #ifdef BOOKE
 911                 if (copyin((void *)frame->srr0, &inst, sizeof(inst)) != 0)
 912                         return (-1);
 913                 reg = EXC_ALI_INST_RST(inst);
 914 #else
 915                 reg = EXC_ALI_RST(frame->cpu.aim.dsisr);
 916 #endif
 917                 fpr = &td->td_pcb->pcb_fpu.fpr[reg].fpr;
 918                 fputhread = PCPU_GET(fputhread);
 919
 920                 /* Juggle the FPU to ensure that we've initialized
 921                  * the FPRs, and that their current state is in
 922                  * the PCB.
 923                  */
 924                 if (fputhread != td) {
 925                         if (fputhread)
 926                                 save_fpu(fputhread);
 927                         enable_fpu(td);
 928                 }
 929                 save_fpu(td);
 930
 931                 if (indicator == EXC_ALI_LFD) {
 932                         if (copyin((void *)frame->dar, fpr,
 933                             sizeof(double)) != 0)
 934                                 return (-1);
 935                         enable_fpu(td);
 936                 } else {
 937                         if (copyout(fpr, (void *)frame->dar,
 938                             sizeof(double)) != 0)
 939                                 return (-1);
 940                 }
 941                 return (0);
 942                 break;
 943         }
 944 #endif
 945
 946         return (-1);
 947 }
 948
 949 #if defined(__powerpc64__) && defined(AIM)
 950 #define MSKNSHL(x, m, n) "(((" #x ") & " #m ") << " #n ")"
 951 #define MSKNSHR(x, m, n) "(((" #x ") & " #m ") >> " #n ")"
 952
 953 /* xvcpsgndp instruction, built in opcode format.
 954  * This can be changed to use mnemonic after a toolchain update.
 955  */
 956 #define XVCPSGNDP(xt, xa, xb) \
 957         __asm __volatile(".long (" \
 958                 MSKNSHL(60, 0x3f, 26) " | " \
 959                 MSKNSHL(xt, 0x1f, 21) " | " \
 960                 MSKNSHL(xa, 0x1f, 16) " | " \
 961                 MSKNSHL(xb, 0x1f, 11) " | " \
 962                 MSKNSHL(240, 0xff, 3) " | " \
 963                 MSKNSHR(xa,  0x20, 3) " | " \
 964                 MSKNSHR(xa,  0x20, 4) " | " \
 965                 MSKNSHR(xa,  0x20, 5) ")")
 966
 967 /* Macros to normalize 1 or 10 VSX registers */
 968 #define NORM(x) XVCPSGNDP(x, x, x)
 969 #define NORM10(x) \
 970         NORM(x ## 0); NORM(x ## 1); NORM(x ## 2); NORM(x ## 3); NORM(x ## 4); \
 971         NORM(x ## 5); NORM(x ## 6); NORM(x ## 7); NORM(x ## 8); NORM(x ## 9)
 972
 973 static void
 974 normalize_inputs(void)
 975 {
 976         register_t msr;
 977
 978         /* enable VSX */
 979         msr = mfmsr();
 980         mtmsr(msr | PSL_VSX);
 981
 982         NORM(0);   NORM(1);   NORM(2);   NORM(3);   NORM(4);
 983         NORM(5);   NORM(6);   NORM(7);   NORM(8);   NORM(9);
 984         NORM10(1); NORM10(2); NORM10(3); NORM10(4); NORM10(5);
 985         NORM(60);  NORM(61);  NORM(62);  NORM(63);
 986
 987         /* restore MSR */
 988         mtmsr(msr);
 989 }
 990 #endif
 991
 992 #ifdef KDB
 993 int
 994 db_trap_glue(struct trapframe *frame)
 995 {
 996
 997         if (!(frame->srr1 & PSL_PR)
 998             && (frame->exc == EXC_TRC || frame->exc == EXC_RUNMODETRC
 999                 || frame_is_trap_inst(frame)
1000                 || frame->exc == EXC_BPT
1001                 || frame->exc == EXC_DEBUG
1002                 || frame->exc == EXC_DSI)) {
1003                 int type = frame->exc;
1004
1005                 /* Ignore DTrace traps. */
1006                 if (*(uint32_t *)frame->srr0 == EXC_DTRACE)
1007                         return (0);
1008                 if (frame_is_trap_inst(frame)) {
1009                         type = T_BREAKPOINT;
1010                 }
1011                 return (kdb_trap(type, 0, frame));
1012         }
1013
1014         return (0);
1015 }
1016 #endif