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                         } else {
 409                                 sig = ppc_instr_emulate(frame, td);
 410                                 if (sig == SIGILL) {
 411                                         if (frame->srr1 & EXC_PGM_PRIV)
 412                                                 ucode = ILL_PRVOPC;
 413                                         else if (frame->srr1 & EXC_PGM_ILLEGAL)
 414                                                 ucode = ILL_ILLOPC;
 415                                 } else if (sig == SIGFPE)
 416                                         ucode = FPE_FLTINV;     /* Punt for now, invalid operation. */
 417                         }
 418                         break;
 419
 420                 case EXC_MCHK:
 421                         sig = cpu_machine_check(td, frame, &ucode);
 422                         printtrap(frame->exc, frame, 0, (frame->srr1 & PSL_PR));
 423                         break;
 424
 425 #if defined(__powerpc64__) && defined(AIM)
 426                 case EXC_SOFT_PATCH:
 427                         /*
 428                          * Point to the instruction that generated the exception to execute it again,
 429                          * and normalize the register values.
 430                          */
 431                         frame->srr0 -= 4;
 432                         normalize_inputs();
 433                         break;
 434 #endif
 435
 436                 default:
 437                         trap_fatal(frame);
 438                 }
 439         } else {
 440                 /* Kernel Mode Traps */
 441
 442                 KASSERT(cold || td->td_ucred != NULL,
 443                     ("kernel trap doesn't have ucred"));
 444                 switch (type) {
 445                 case EXC_PGM:
 446 #ifdef KDTRACE_HOOKS
 447                         if (frame_is_trap_inst(frame)) {
 448                                 if (*(uint32_t *)frame->srr0 == EXC_DTRACE) {
 449                                         if (dtrace_invop_jump_addr != NULL) {
 450                                                 dtrace_invop_jump_addr(frame);
 451                                                 return;
 452                                         }
 453                                 }
 454                         }
 455 #endif
 456 #ifdef KDB
 457                         if (db_trap_glue(frame))
 458                                 return;
 459 #endif
 460                         break;
 461 #if defined(__powerpc64__) && defined(AIM)
 462                 case EXC_DSE:
 463                         /* DSE on radix mmu is automatically fatal. */
 464                         if (radix_mmu)
 465                                 break;
 466                         if (td->td_pcb->pcb_cpu.aim.usr_vsid != 0 &&
 467                             (frame->dar & SEGMENT_MASK) == USER_ADDR) {
 468                                 __asm __volatile ("slbmte %0, %1" ::
 469                                         "r"(td->td_pcb->pcb_cpu.aim.usr_vsid),
 470                                         "r"(USER_SLB_SLBE));
 471                                 return;
 472                         }
 473                         break;
 474 #endif
 475                 case EXC_DSI:
 476                         if (trap_pfault(frame, false, NULL, NULL))
 477                                 return;
 478                         break;
 479                 case EXC_MCHK:
 480                         if (handle_onfault(frame))
 481                                 return;
 482                         break;
 483                 default:
 484                         break;
 485                 }
 486                 trap_fatal(frame);
 487         }
 488
 489         if (sig != 0) {
 490                 if (p->p_sysent->sv_transtrap != NULL)
 491                         sig = (p->p_sysent->sv_transtrap)(sig, type);
 492                 ksiginfo_init_trap(&ksi);
 493                 ksi.ksi_signo = sig;
 494                 ksi.ksi_code = (int) ucode; /* XXX, not POSIX */
 495                 ksi.ksi_addr = (void *)addr;
 496                 ksi.ksi_trapno = type;
 497                 if (uprintf_signal) {
 498                         uprintf("pid %d comm %s: signal %d code %d type %d "
 499                                 "addr 0x%lx r1 0x%lx srr0 0x%lx srr1 0x%lx\n",
 500                                 p->p_pid, p->p_comm, sig, ucode, type,
 501                                 (u_long)addr, (u_long)frame->fixreg[1],
 502                                 (u_long)frame->srr0, (u_long)frame->srr1);
 503                 }
 504
 505                 trapsignal(td, &ksi);
 506         }
 507
 508         userret(td, frame);
 509 }
 510
 511 static void
 512 trap_fatal(struct trapframe *frame)
 513 {
 514 #ifdef KDB
 515         bool handled;
 516 #endif
 517
 518         printtrap(frame->exc, frame, 1, (frame->srr1 & PSL_PR));
 519 #ifdef KDB
 520         if (debugger_on_trap) {
 521                 kdb_why = KDB_WHY_TRAP;
 522                 handled = kdb_trap(frame->exc, 0, frame);
 523                 kdb_why = KDB_WHY_UNSET;
 524                 if (handled)
 525                         return;
 526         }
 527 #endif
 528         panic("%s trap", trapname(frame->exc));
 529 }
 530
 531 static void
 532 cpu_printtrap(u_int vector, struct trapframe *frame, int isfatal, int user)
 533 {
 534 #ifdef AIM
 535         uint16_t ver;
 536
 537         switch (vector) {
 538         case EXC_MCHK:
 539                 ver = mfpvr() >> 16;
 540                 if (MPC745X_P(ver))
 541                         printf("    msssr0         = 0x%b\n",
 542                             (int)mfspr(SPR_MSSSR0), MSSSR_BITMASK);
 543         case EXC_DSE:
 544         case EXC_DSI:
 545         case EXC_DTMISS:
 546                 printf("   dsisr           = 0x%lx\n",
 547                     (u_long)frame->cpu.aim.dsisr);
 548                 break;
 549         }
 550 #elif defined(BOOKE)
 551         vm_paddr_t pa;
 552
 553         switch (vector) {
 554         case EXC_MCHK:
 555                 pa = mfspr(SPR_MCARU);
 556                 pa = (pa << 32) | (u_register_t)mfspr(SPR_MCAR);
 557                 printf("   mcsr            = 0x%b\n",
 558                     (int)mfspr(SPR_MCSR), MCSR_BITMASK);
 559                 printf("   mcar            = 0x%jx\n", (uintmax_t)pa);
 560         }
 561         printf("   esr             = 0x%b\n",
 562             (int)frame->cpu.booke.esr, ESR_BITMASK);
 563 #endif
 564 }
 565
 566 static void
 567 printtrap(u_int vector, struct trapframe *frame, int isfatal, int user)
 568 {
 569
 570         printf("\n");
 571         printf("%s %s trap:\n", isfatal ? "fatal" : "handled",
 572             user ? "user" : "kernel");
 573         printf("\n");
 574         printf("   exception       = 0x%x (%s)\n", vector, trapname(vector));
 575         switch (vector) {
 576         case EXC_DSE:
 577         case EXC_DSI:
 578         case EXC_DTMISS:
 579         case EXC_ALI:
 580         case EXC_MCHK:
 581                 printf("   virtual address = 0x%" PRIxPTR "\n", frame->dar);
 582                 break;
 583         case EXC_ISE:
 584         case EXC_ISI:
 585         case EXC_ITMISS:
 586                 printf("   virtual address = 0x%" PRIxPTR "\n", frame->srr0);
 587                 break;
 588         }
 589         cpu_printtrap(vector, frame, isfatal, user);
 590         printf("   srr0            = 0x%" PRIxPTR " (0x%" PRIxPTR ")\n",
 591             frame->srr0, frame->srr0 - (register_t)(__startkernel - KERNBASE));
 592         printf("   srr1            = 0x%lx\n", (u_long)frame->srr1);
 593         printf("   current msr     = 0x%" PRIxPTR "\n", mfmsr());
 594         printf("   lr              = 0x%" PRIxPTR " (0x%" PRIxPTR ")\n",
 595             frame->lr, frame->lr - (register_t)(__startkernel - KERNBASE));
 596         printf("   frame           = %p\n", frame);
 597         printf("   curthread       = %p\n", curthread);
 598         if (curthread != NULL)
 599                 printf("          pid = %d, comm = %s\n",
 600                     curthread->td_proc->p_pid, curthread->td_name);
 601         printf("\n");
 602 }
 603
 604 /*
 605  * Handles a fatal fault when we have onfault state to recover.  Returns
 606  * non-zero if there was onfault recovery state available.
 607  */
 608 static int
 609 handle_onfault(struct trapframe *frame)
 610 {
 611         struct          thread *td;
 612         jmp_buf         *fb;
 613
 614         td = curthread;
 615 #if defined(__powerpc64__) || defined(BOOKE)
 616         uintptr_t dispatch = (uintptr_t)td->td_pcb->pcb_onfault;
 617
 618         if (dispatch == 0)
 619                 return (0);
 620         /* Short-circuit radix and Book-E paths. */
 621         switch (dispatch) {
 622                 case COPYFAULT:
 623                         frame->srr0 = (uintptr_t)copy_fault;
 624                         return (1);
 625                 case FUSUFAULT:
 626                         frame->srr0 = (uintptr_t)fusufault;
 627                         return (1);
 628                 default:
 629                         break;
 630         }
 631 #endif
 632         fb = td->td_pcb->pcb_onfault;
 633         if (fb != NULL) {
 634                 frame->srr0 = (*fb)->_jb[FAULTBUF_LR];
 635                 frame->fixreg[1] = (*fb)->_jb[FAULTBUF_R1];
 636                 frame->fixreg[2] = (*fb)->_jb[FAULTBUF_R2];
 637                 frame->fixreg[3] = 1;
 638                 frame->cr = (*fb)->_jb[FAULTBUF_CR];
 639                 bcopy(&(*fb)->_jb[FAULTBUF_R14], &frame->fixreg[14],
 640                     18 * sizeof(register_t));
 641                 td->td_pcb->pcb_onfault = NULL; /* Returns twice, not thrice */
 642                 return (1);
 643         }
 644         return (0);
 645 }
 646
 647 int
 648 cpu_fetch_syscall_args(struct thread *td)
 649 {
 650         struct proc *p;
 651         struct trapframe *frame;
 652         struct syscall_args *sa;
 653         caddr_t params;
 654         size_t argsz;
 655         int error, n, narg, i;
 656
 657         p = td->td_proc;
 658         frame = td->td_frame;
 659         sa = &td->td_sa;
 660
 661         sa->code = frame->fixreg[0];
 662         params = (caddr_t)(frame->fixreg + FIRSTARG);
 663         n = NARGREG;
 664
 665         if (sa->code == SYS_syscall) {
 666                 /*
 667                  * code is first argument,
 668                  * followed by actual args.
 669                  */
 670                 sa->code = *(register_t *) params;
 671                 params += sizeof(register_t);
 672                 n -= 1;
 673         } else if (sa->code == SYS___syscall) {
 674                 /*
 675                  * Like syscall, but code is a quad,
 676                  * so as to maintain quad alignment
 677                  * for the rest of the args.
 678                  */
 679                 if (SV_PROC_FLAG(p, SV_ILP32)) {
 680                         params += sizeof(register_t);
 681                         sa->code = *(register_t *) params;
 682                         params += sizeof(register_t);
 683                         n -= 2;
 684                 } else {
 685                         sa->code = *(register_t *) params;
 686                         params += sizeof(register_t);
 687                         n -= 1;
 688                 }
 689         }
 690
 691         if (sa->code >= p->p_sysent->sv_size)
 692                 sa->callp = &p->p_sysent->sv_table[0];
 693         else
 694                 sa->callp = &p->p_sysent->sv_table[sa->code];
 695
 696         narg = sa->callp->sy_narg;
 697
 698         if (SV_PROC_FLAG(p, SV_ILP32)) {
 699                 argsz = sizeof(uint32_t);
 700
 701                 for (i = 0; i < n; i++)
 702                         sa->args[i] = ((u_register_t *)(params))[i] &
 703                             0xffffffff;
 704         } else {
 705                 argsz = sizeof(uint64_t);
 706
 707                 for (i = 0; i < n; i++)
 708                         sa->args[i] = ((u_register_t *)(params))[i];
 709         }
 710
 711         if (narg > n)
 712                 error = copyin(MOREARGS(frame->fixreg[1]), sa->args + n,
 713                                (narg - n) * argsz);
 714         else
 715                 error = 0;
 716
 717 #ifdef __powerpc64__
 718         if (SV_PROC_FLAG(p, SV_ILP32) && narg > n) {
 719                 /* Expand the size of arguments copied from the stack */
 720
 721                 for (i = narg; i >= n; i--)
 722                         sa->args[i] = ((uint32_t *)(&sa->args[n]))[i-n];
 723         }
 724 #endif
 725
 726         if (error == 0) {
 727                 td->td_retval[0] = 0;
 728                 td->td_retval[1] = frame->fixreg[FIRSTARG + 1];
 729         }
 730         return (error);
 731 }
 732
 733 #include "../../kern/subr_syscall.c"
 734
 735 void
 736 syscall(struct trapframe *frame)
 737 {
 738         struct thread *td;
 739
 740         td = curthread;
 741         td->td_frame = frame;
 742
 743 #if defined(__powerpc64__) && defined(AIM)
 744         /*
 745          * Speculatively restore last user SLB segment, which we know is
 746          * invalid already, since we are likely to do copyin()/copyout().
 747          */
 748         if (td->td_pcb->pcb_cpu.aim.usr_vsid != 0)
 749                 __asm __volatile ("slbmte %0, %1; isync" ::
 750                     "r"(td->td_pcb->pcb_cpu.aim.usr_vsid), "r"(USER_SLB_SLBE));
 751 #endif
 752
 753         syscallenter(td);
 754         syscallret(td);
 755 }
 756
 757 static bool
 758 trap_pfault(struct trapframe *frame, bool user, int *signo, int *ucode)
 759 {
 760         vm_offset_t     eva;
 761         struct          thread *td;
 762         struct          proc *p;
 763         vm_map_t        map;
 764         vm_prot_t       ftype;
 765         int             rv, is_user;
 766
 767         td = curthread;
 768         p = td->td_proc;
 769         if (frame->exc == EXC_ISI) {
 770                 eva = frame->srr0;
 771                 ftype = VM_PROT_EXECUTE;
 772                 if (frame->srr1 & SRR1_ISI_PFAULT)
 773                         ftype |= VM_PROT_READ;
 774         } else {
 775                 eva = frame->dar;
 776 #ifdef BOOKE
 777                 if (frame->cpu.booke.esr & ESR_ST)
 778 #else
 779                 if (frame->cpu.aim.dsisr & DSISR_STORE)
 780 #endif
 781                         ftype = VM_PROT_WRITE;
 782                 else
 783                         ftype = VM_PROT_READ;
 784         }
 785 #if defined(__powerpc64__) && defined(AIM)
 786         if (radix_mmu && pmap_nofault(&p->p_vmspace->vm_pmap, eva, ftype) == 0)
 787                 return (true);
 788 #endif
 789
 790         if (__predict_false((td->td_pflags & TDP_NOFAULTING) == 0)) {
 791                 /*
 792                  * If we get a page fault while in a critical section, then
 793                  * it is most likely a fatal kernel page fault.  The kernel
 794                  * is already going to panic trying to get a sleep lock to
 795                  * do the VM lookup, so just consider it a fatal trap so the
 796                  * kernel can print out a useful trap message and even get
 797                  * to the debugger.
 798                  *
 799                  * If we get a page fault while holding a non-sleepable
 800                  * lock, then it is most likely a fatal kernel page fault.
 801                  * If WITNESS is enabled, then it's going to whine about
 802                  * bogus LORs with various VM locks, so just skip to the
 803                  * fatal trap handling directly.
 804                  */
 805                 if (td->td_critnest != 0 ||
 806                         WITNESS_CHECK(WARN_SLEEPOK | WARN_GIANTOK, NULL,
 807                                 "Kernel page fault") != 0) {
 808                         trap_fatal(frame);
 809                         return (false);
 810                 }
 811         }
 812         if (user) {
 813                 KASSERT(p->p_vmspace != NULL, ("trap_pfault: vmspace  NULL"));
 814                 map = &p->p_vmspace->vm_map;
 815         } else {
 816                 rv = pmap_decode_kernel_ptr(eva, &is_user, &eva);
 817                 if (rv != 0)
 818                         return (false);
 819
 820                 if (is_user)
 821                         map = &p->p_vmspace->vm_map;
 822                 else
 823                         map = kernel_map;
 824         }
 825
 826         /* Fault in the page. */
 827         rv = vm_fault_trap(map, eva, ftype, VM_FAULT_NORMAL, signo, ucode);
 828         /*
 829          * XXXDTRACE: add dtrace_doubletrap_func here?
 830          */
 831
 832         if (rv == KERN_SUCCESS)
 833                 return (true);
 834
 835         if (!user && handle_onfault(frame))
 836                 return (true);
 837
 838         return (false);
 839 }
 840
 841 /*
 842  * For now, this only deals with the particular unaligned access case
 843  * that gcc tends to generate.  Eventually it should handle all of the
 844  * possibilities that can happen on a 32-bit PowerPC in big-endian mode.
 845  */
 846
 847 static int
 848 fix_unaligned(struct thread *td, struct trapframe *frame)
 849 {
 850         struct thread   *fputhread;
 851 #ifdef BOOKE
 852         uint32_t        inst;
 853 #endif
 854         int             indicator, reg;
 855         double          *fpr;
 856
 857 #ifdef __SPE__
 858         indicator = (frame->cpu.booke.esr & (ESR_ST|ESR_SPE));
 859         if (indicator & ESR_SPE) {
 860                 if (copyin((void *)frame->srr0, &inst, sizeof(inst)) != 0)
 861                         return (-1);
 862                 reg = EXC_ALI_INST_RST(inst);
 863                 fpr = (double *)td->td_pcb->pcb_vec.vr[reg];
 864                 fputhread = PCPU_GET(vecthread);
 865
 866                 /* Juggle the SPE to ensure that we've initialized
 867                  * the registers, and that their current state is in
 868                  * the PCB.
 869                  */
 870                 if (fputhread != td) {
 871                         if (fputhread)
 872                                 save_vec(fputhread);
 873                         enable_vec(td);
 874                 }
 875                 save_vec(td);
 876
 877                 if (!(indicator & ESR_ST)) {
 878                         if (copyin((void *)frame->dar, fpr,
 879                             sizeof(double)) != 0)
 880                                 return (-1);
 881                         frame->fixreg[reg] = td->td_pcb->pcb_vec.vr[reg][1];
 882                         enable_vec(td);
 883                 } else {
 884                         td->td_pcb->pcb_vec.vr[reg][1] = frame->fixreg[reg];
 885                         if (copyout(fpr, (void *)frame->dar,
 886                             sizeof(double)) != 0)
 887                                 return (-1);
 888                 }
 889                 return (0);
 890         }
 891 #else
 892 #ifdef BOOKE
 893         indicator = (frame->cpu.booke.esr & ESR_ST) ? EXC_ALI_STFD : EXC_ALI_LFD;
 894 #else
 895         indicator = EXC_ALI_OPCODE_INDICATOR(frame->cpu.aim.dsisr);
 896 #endif
 897
 898         switch (indicator) {
 899         case EXC_ALI_LFD:
 900         case EXC_ALI_STFD:
 901 #ifdef BOOKE
 902                 if (copyin((void *)frame->srr0, &inst, sizeof(inst)) != 0)
 903                         return (-1);
 904                 reg = EXC_ALI_INST_RST(inst);
 905 #else
 906                 reg = EXC_ALI_RST(frame->cpu.aim.dsisr);
 907 #endif
 908                 fpr = &td->td_pcb->pcb_fpu.fpr[reg].fpr;
 909                 fputhread = PCPU_GET(fputhread);
 910
 911                 /* Juggle the FPU to ensure that we've initialized
 912                  * the FPRs, and that their current state is in
 913                  * the PCB.
 914                  */
 915                 if (fputhread != td) {
 916                         if (fputhread)
 917                                 save_fpu(fputhread);
 918                         enable_fpu(td);
 919                 }
 920                 save_fpu(td);
 921
 922                 if (indicator == EXC_ALI_LFD) {
 923                         if (copyin((void *)frame->dar, fpr,
 924                             sizeof(double)) != 0)
 925                                 return (-1);
 926                         enable_fpu(td);
 927                 } else {
 928                         if (copyout(fpr, (void *)frame->dar,
 929                             sizeof(double)) != 0)
 930                                 return (-1);
 931                 }
 932                 return (0);
 933                 break;
 934         }
 935 #endif
 936
 937         return (-1);
 938 }
 939
 940 #if defined(__powerpc64__) && defined(AIM)
 941 #define MSKNSHL(x, m, n) "(((" #x ") & " #m ") << " #n ")"
 942 #define MSKNSHR(x, m, n) "(((" #x ") & " #m ") >> " #n ")"
 943
 944 /* xvcpsgndp instruction, built in opcode format.
 945  * This can be changed to use mnemonic after a toolchain update.
 946  */
 947 #define XVCPSGNDP(xt, xa, xb) \
 948         __asm __volatile(".long (" \
 949                 MSKNSHL(60, 0x3f, 26) " | " \
 950                 MSKNSHL(xt, 0x1f, 21) " | " \
 951                 MSKNSHL(xa, 0x1f, 16) " | " \
 952                 MSKNSHL(xb, 0x1f, 11) " | " \
 953                 MSKNSHL(240, 0xff, 3) " | " \
 954                 MSKNSHR(xa,  0x20, 3) " | " \
 955                 MSKNSHR(xa,  0x20, 4) " | " \
 956                 MSKNSHR(xa,  0x20, 5) ")")
 957
 958 /* Macros to normalize 1 or 10 VSX registers */
 959 #define NORM(x) XVCPSGNDP(x, x, x)
 960 #define NORM10(x) \
 961         NORM(x ## 0); NORM(x ## 1); NORM(x ## 2); NORM(x ## 3); NORM(x ## 4); \
 962         NORM(x ## 5); NORM(x ## 6); NORM(x ## 7); NORM(x ## 8); NORM(x ## 9)
 963
 964 static void
 965 normalize_inputs(void)
 966 {
 967         unsigned long msr;
 968
 969         /* enable VSX */
 970         msr = mfmsr();
 971         mtmsr(msr | PSL_VSX);
 972
 973         NORM(0);   NORM(1);   NORM(2);   NORM(3);   NORM(4);
 974         NORM(5);   NORM(6);   NORM(7);   NORM(8);   NORM(9);
 975         NORM10(1); NORM10(2); NORM10(3); NORM10(4); NORM10(5);
 976         NORM(60);  NORM(61);  NORM(62);  NORM(63);
 977
 978         /* restore MSR */
 979         mtmsr(msr);
 980 }
 981 #endif
 982
 983 #ifdef KDB
 984 int
 985 db_trap_glue(struct trapframe *frame)
 986 {
 987
 988         if (!(frame->srr1 & PSL_PR)
 989             && (frame->exc == EXC_TRC || frame->exc == EXC_RUNMODETRC
 990                 || frame_is_trap_inst(frame)
 991                 || frame->exc == EXC_BPT
 992                 || frame->exc == EXC_DEBUG
 993                 || frame->exc == EXC_DSI)) {
 994                 int type = frame->exc;
 995
 996                 /* Ignore DTrace traps. */
 997                 if (*(uint32_t *)frame->srr0 == EXC_DTRACE)
 998                         return (0);
 999                 if (frame_is_trap_inst(frame)) {
1000                         type = T_BREAKPOINT;
1001                 }
1002                 return (kdb_trap(type, 0, frame));
1003         }
1004
1005         return (0);
1006 }
1007 #endif