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/pioctl.h>
  44 #include <sys/ptrace.h>
  45 #include <sys/reboot.h>
  46 #include <sys/syscall.h>
  47 #include <sys/sysent.h>
  48 #include <sys/systm.h>
  49 #include <sys/kernel.h>
  50 #include <sys/uio.h>
  51 #include <sys/signalvar.h>
  52 #include <sys/vmmeter.h>
  53
  54 #include <security/audit/audit.h>
  55
  56 #include <vm/vm.h>
  57 #include <vm/pmap.h>
  58 #include <vm/vm_extern.h>
  59 #include <vm/vm_param.h>
  60 #include <vm/vm_kern.h>
  61 #include <vm/vm_map.h>
  62 #include <vm/vm_page.h>
  63
  64 #include <machine/_inttypes.h>
  65 #include <machine/altivec.h>
  66 #include <machine/cpu.h>
  67 #include <machine/db_machdep.h>
  68 #include <machine/fpu.h>
  69 #include <machine/frame.h>
  70 #include <machine/pcb.h>
  71 #include <machine/psl.h>
  72 #include <machine/trap.h>
  73 #include <machine/spr.h>
  74 #include <machine/sr.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 int      trap_pfault(struct trapframe *frame, int user);
  90 static int      fix_unaligned(struct thread *td, struct trapframe *frame);
  91 static int      handle_onfault(struct trapframe *frame);
  92 static void     syscall(struct trapframe *frame);
  93
  94 #if defined(__powerpc64__) && defined(AIM)
  95        void     handle_kernel_slb_spill(int, register_t, register_t);
  96 static int      handle_user_slb_spill(pmap_t pm, vm_offset_t addr);
  97 extern int      n_slbs;
  98 #endif
  99
 100 extern vm_offset_t __startkernel;
 101
 102 #ifdef KDB
 103 int db_trap_glue(struct trapframe *);           /* Called from trap_subr.S */
 104 #endif
 105
 106 struct powerpc_exception {
 107         u_int   vector;
 108         char    *name;
 109 };
 110
 111 #ifdef KDTRACE_HOOKS
 112 #include <sys/dtrace_bsd.h>
 113
 114 int (*dtrace_invop_jump_addr)(struct trapframe *);
 115 #endif
 116
 117 static struct powerpc_exception powerpc_exceptions[] = {
 118         { EXC_CRIT,     "critical input" },
 119         { EXC_RST,      "system reset" },
 120         { EXC_MCHK,     "machine check" },
 121         { EXC_DSI,      "data storage interrupt" },
 122         { EXC_DSE,      "data segment exception" },
 123         { EXC_ISI,      "instruction storage interrupt" },
 124         { EXC_ISE,      "instruction segment exception" },
 125         { EXC_EXI,      "external interrupt" },
 126         { EXC_ALI,      "alignment" },
 127         { EXC_PGM,      "program" },
 128         { EXC_HEA,      "hypervisor emulation assistance" },
 129         { EXC_FPU,      "floating-point unavailable" },
 130         { EXC_APU,      "auxiliary proc unavailable" },
 131         { EXC_DECR,     "decrementer" },
 132         { EXC_FIT,      "fixed-interval timer" },
 133         { EXC_WDOG,     "watchdog timer" },
 134         { EXC_SC,       "system call" },
 135         { EXC_TRC,      "trace" },
 136         { EXC_FPA,      "floating-point assist" },
 137         { EXC_DEBUG,    "debug" },
 138         { EXC_PERF,     "performance monitoring" },
 139         { EXC_VEC,      "altivec unavailable" },
 140         { EXC_VSX,      "vsx unavailable" },
 141         { EXC_FAC,      "facility unavailable" },
 142         { EXC_ITMISS,   "instruction tlb miss" },
 143         { EXC_DLMISS,   "data load tlb miss" },
 144         { EXC_DSMISS,   "data store tlb miss" },
 145         { EXC_BPT,      "instruction breakpoint" },
 146         { EXC_SMI,      "system management" },
 147         { EXC_VECAST_G4,        "altivec assist" },
 148         { EXC_THRM,     "thermal management" },
 149         { EXC_RUNMODETRC,       "run mode/trace" },
 150         { EXC_LAST,     NULL }
 151 };
 152
 153 #define ESR_BITMASK                                                     \
 154     "\20"                                                               \
 155     "\040b0\037b1\036b2\035b3\034PIL\033PRR\032PTR\031FP"               \
 156     "\030ST\027b9\026DLK\025ILK\024b12\023b13\022BO\021PIE"             \
 157     "\020b16\017b17\016b18\015b19\014b20\013b21\012b22\011b23"          \
 158     "\010SPE\007EPID\006b26\005b27\004b28\003b29\002b30\001b31"
 159 #define MCSR_BITMASK                                                    \
 160     "\20"                                                               \
 161     "\040MCP\037ICERR\036DCERR\035TLBPERR\034L2MMU_MHIT\033b5\032b6\031b7"      \
 162     "\030b8\027b9\026b10\025NMI\024MAV\023MEA\022b14\021IF"             \
 163     "\020LD\017ST\016LDG\015b19\014b20\013b21\012b22\011b23"            \
 164     "\010b24\007b25\006b26\005b27\004b28\003b29\002TLBSYNC\001BSL2_ERR"
 165 #define MSSSR_BITMASK                                                   \
 166     "\20"                                                               \
 167     "\040b0\037b1\036b2\035b3\034b4\033b5\032b6\031b7"                  \
 168     "\030b8\027b9\026b10\025b11\024b12\023L2TAG\022L2DAT\021L3TAG"      \
 169     "\020L3DAT\017APE\016DPE\015TEA\014b20\013b21\012b22\011b23"        \
 170     "\010b24\007b25\006b26\005b27\004b28\003b29\002b30\001b31"
 171
 172
 173 static const char *
 174 trapname(u_int vector)
 175 {
 176         struct  powerpc_exception *pe;
 177
 178         for (pe = powerpc_exceptions; pe->vector != EXC_LAST; pe++) {
 179                 if (pe->vector == vector)
 180                         return (pe->name);
 181         }
 182
 183         return ("unknown");
 184 }
 185
 186 static inline bool
 187 frame_is_trap_inst(struct trapframe *frame)
 188 {
 189 #ifdef AIM
 190         return (frame->exc == EXC_PGM && frame->srr1 & EXC_PGM_TRAP);
 191 #else
 192         return ((frame->cpu.booke.esr & ESR_PTR) != 0);
 193 #endif
 194 }
 195
 196 void
 197 trap(struct trapframe *frame)
 198 {
 199         struct thread   *td;
 200         struct proc     *p;
 201 #ifdef KDTRACE_HOOKS
 202         uint32_t inst;
 203 #endif
 204         int             sig, type, user;
 205         u_int           ucode;
 206         ksiginfo_t      ksi;
 207         register_t      fscr;
 208
 209         VM_CNT_INC(v_trap);
 210
 211 #ifdef KDB
 212         if (kdb_active) {
 213                 kdb_reenter();
 214                 return;
 215         }
 216 #endif
 217
 218         td = curthread;
 219         p = td->td_proc;
 220
 221         type = ucode = frame->exc;
 222         sig = 0;
 223         user = frame->srr1 & PSL_PR;
 224
 225         CTR3(KTR_TRAP, "trap: %s type=%s (%s)", td->td_name,
 226             trapname(type), user ? "user" : "kernel");
 227
 228 #ifdef KDTRACE_HOOKS
 229         /*
 230          * A trap can occur while DTrace executes a probe. Before
 231          * executing the probe, DTrace blocks re-scheduling and sets
 232          * a flag in its per-cpu flags to indicate that it doesn't
 233          * want to fault. On returning from the probe, the no-fault
 234          * flag is cleared and finally re-scheduling is enabled.
 235          *
 236          * If the DTrace kernel module has registered a trap handler,
 237          * call it and if it returns non-zero, assume that it has
 238          * handled the trap and modified the trap frame so that this
 239          * function can return normally.
 240          */
 241         if (dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, type) != 0)
 242                 return;
 243 #endif
 244
 245         if (user) {
 246                 td->td_pticks = 0;
 247                 td->td_frame = frame;
 248                 if (td->td_cowgen != p->p_cowgen)
 249                         thread_cow_update(td);
 250
 251                 /* User Mode Traps */
 252                 switch (type) {
 253                 case EXC_RUNMODETRC:
 254                 case EXC_TRC:
 255                         frame->srr1 &= ~PSL_SE;
 256                         sig = SIGTRAP;
 257                         ucode = TRAP_TRACE;
 258                         break;
 259
 260 #if defined(__powerpc64__) && defined(AIM)
 261                 case EXC_ISE:
 262                 case EXC_DSE:
 263                         if (handle_user_slb_spill(&p->p_vmspace->vm_pmap,
 264                             (type == EXC_ISE) ? frame->srr0 : frame->dar) != 0){
 265                                 sig = SIGSEGV;
 266                                 ucode = SEGV_MAPERR;
 267                         }
 268                         break;
 269 #endif
 270                 case EXC_DSI:
 271                 case EXC_ISI:
 272                         sig = trap_pfault(frame, 1);
 273                         if (sig == SIGSEGV)
 274                                 ucode = SEGV_MAPERR;
 275                         break;
 276
 277                 case EXC_SC:
 278                         syscall(frame);
 279                         break;
 280
 281                 case EXC_FPU:
 282                         KASSERT((td->td_pcb->pcb_flags & PCB_FPU) != PCB_FPU,
 283                             ("FPU already enabled for thread"));
 284                         enable_fpu(td);
 285                         break;
 286
 287                 case EXC_VEC:
 288                         KASSERT((td->td_pcb->pcb_flags & PCB_VEC) != PCB_VEC,
 289                             ("Altivec already enabled for thread"));
 290                         enable_vec(td);
 291                         break;
 292
 293                 case EXC_VSX:
 294                         KASSERT((td->td_pcb->pcb_flags & PCB_VSX) != PCB_VSX,
 295                             ("VSX already enabled for thread"));
 296                         if (!(td->td_pcb->pcb_flags & PCB_VEC))
 297                                 enable_vec(td);
 298                         if (!(td->td_pcb->pcb_flags & PCB_FPU))
 299                                 save_fpu(td);
 300                         td->td_pcb->pcb_flags |= PCB_VSX;
 301                         enable_fpu(td);
 302                         break;
 303
 304                 case EXC_FAC:
 305                         fscr = mfspr(SPR_FSCR);
 306                         if ((fscr & FSCR_IC_MASK) == FSCR_IC_HTM) {
 307                                 CTR0(KTR_TRAP, "Hardware Transactional Memory subsystem disabled");
 308                         }
 309                         sig = SIGILL;
 310                         ucode = ILL_ILLOPC;
 311                         break;
 312                 case EXC_HEA:
 313                         sig = SIGILL;
 314                         ucode = ILL_ILLOPC;
 315                         break;
 316
 317                 case EXC_VECAST_E:
 318                 case EXC_VECAST_G4:
 319                 case EXC_VECAST_G5:
 320                         /*
 321                          * We get a VPU assist exception for IEEE mode
 322                          * vector operations on denormalized floats.
 323                          * Emulating this is a giant pain, so for now,
 324                          * just switch off IEEE mode and treat them as
 325                          * zero.
 326                          */
 327
 328                         save_vec(td);
 329                         td->td_pcb->pcb_vec.vscr |= ALTIVEC_VSCR_NJ;
 330                         enable_vec(td);
 331                         break;
 332
 333                 case EXC_ALI:
 334                         if (fix_unaligned(td, frame) != 0) {
 335                                 sig = SIGBUS;
 336                                 ucode = BUS_ADRALN;
 337                         }
 338                         else
 339                                 frame->srr0 += 4;
 340                         break;
 341
 342                 case EXC_DEBUG: /* Single stepping */
 343                         mtspr(SPR_DBSR, mfspr(SPR_DBSR));
 344                         frame->srr1 &= ~PSL_DE;
 345                         frame->cpu.booke.dbcr0 &= ~(DBCR0_IDM | DBCR0_IC);
 346                         sig = SIGTRAP;
 347                         ucode = TRAP_TRACE;
 348                         break;
 349
 350                 case EXC_PGM:
 351                         /* Identify the trap reason */
 352                         if (frame_is_trap_inst(frame)) {
 353 #ifdef KDTRACE_HOOKS
 354                                 inst = fuword32((const void *)frame->srr0);
 355                                 if (inst == 0x0FFFDDDD &&
 356                                     dtrace_pid_probe_ptr != NULL) {
 357                                         (*dtrace_pid_probe_ptr)(frame);
 358                                         break;
 359                                 }
 360 #endif
 361                                 sig = SIGTRAP;
 362                                 ucode = TRAP_BRKPT;
 363                         } else {
 364                                 sig = ppc_instr_emulate(frame, td->td_pcb);
 365                                 if (sig == SIGILL) {
 366                                         if (frame->srr1 & EXC_PGM_PRIV)
 367                                                 ucode = ILL_PRVOPC;
 368                                         else if (frame->srr1 & EXC_PGM_ILLEGAL)
 369                                                 ucode = ILL_ILLOPC;
 370                                 } else if (sig == SIGFPE)
 371                                         ucode = FPE_FLTINV;     /* Punt for now, invalid operation. */
 372                         }
 373                         break;
 374
 375                 case EXC_MCHK:
 376                         /*
 377                          * Note that this may not be recoverable for the user
 378                          * process, depending on the type of machine check,
 379                          * but it at least prevents the kernel from dying.
 380                          */
 381                         sig = SIGBUS;
 382                         ucode = BUS_OBJERR;
 383                         break;
 384
 385                 default:
 386                         trap_fatal(frame);
 387                 }
 388         } else {
 389                 /* Kernel Mode Traps */
 390
 391                 KASSERT(cold || td->td_ucred != NULL,
 392                     ("kernel trap doesn't have ucred"));
 393                 switch (type) {
 394                 case EXC_PGM:
 395 #ifdef KDTRACE_HOOKS
 396                         if (frame_is_trap_inst(frame)) {
 397                                 if (*(uint32_t *)frame->srr0 == EXC_DTRACE) {
 398                                         if (dtrace_invop_jump_addr != NULL) {
 399                                                 dtrace_invop_jump_addr(frame);
 400                                                 return;
 401                                         }
 402                                 }
 403                         }
 404 #endif
 405 #ifdef KDB
 406                         if (db_trap_glue(frame))
 407                                 return;
 408 #endif
 409                         break;
 410 #if defined(__powerpc64__) && defined(AIM)
 411                 case EXC_DSE:
 412                         if (td->td_pcb->pcb_cpu.aim.usr_vsid != 0 &&
 413                             (frame->dar & SEGMENT_MASK) == USER_ADDR) {
 414                                 __asm __volatile ("slbmte %0, %1" ::
 415                                         "r"(td->td_pcb->pcb_cpu.aim.usr_vsid),
 416                                         "r"(USER_SLB_SLBE));
 417                                 return;
 418                         }
 419                         break;
 420 #endif
 421                 case EXC_DSI:
 422                         if (trap_pfault(frame, 0) == 0)
 423                                 return;
 424                         break;
 425                 case EXC_MCHK:
 426                         if (handle_onfault(frame))
 427                                 return;
 428                         break;
 429                 default:
 430                         break;
 431                 }
 432                 trap_fatal(frame);
 433         }
 434
 435         if (sig != 0) {
 436                 if (p->p_sysent->sv_transtrap != NULL)
 437                         sig = (p->p_sysent->sv_transtrap)(sig, type);
 438                 ksiginfo_init_trap(&ksi);
 439                 ksi.ksi_signo = sig;
 440                 ksi.ksi_code = (int) ucode; /* XXX, not POSIX */
 441                 ksi.ksi_addr = (void *)frame->srr0;
 442                 ksi.ksi_trapno = type;
 443                 trapsignal(td, &ksi);
 444         }
 445
 446         userret(td, frame);
 447 }
 448
 449 static void
 450 trap_fatal(struct trapframe *frame)
 451 {
 452 #ifdef KDB
 453         bool handled;
 454 #endif
 455
 456         printtrap(frame->exc, frame, 1, (frame->srr1 & PSL_PR));
 457 #ifdef KDB
 458         if (debugger_on_trap) {
 459                 kdb_why = KDB_WHY_TRAP;
 460                 handled = kdb_trap(frame->exc, 0, frame);
 461                 kdb_why = KDB_WHY_UNSET;
 462                 if (handled)
 463                         return;
 464         }
 465 #endif
 466         panic("%s trap", trapname(frame->exc));
 467 }
 468
 469 static void
 470 cpu_printtrap(u_int vector, struct trapframe *frame, int isfatal, int user)
 471 {
 472 #ifdef AIM
 473         uint16_t ver;
 474
 475         switch (vector) {
 476         case EXC_DSE:
 477         case EXC_DSI:
 478         case EXC_DTMISS:
 479                 printf("   dsisr           = 0x%lx\n",
 480                     (u_long)frame->cpu.aim.dsisr);
 481                 break;
 482         case EXC_MCHK:
 483                 ver = mfpvr() >> 16;
 484                 if (MPC745X_P(ver))
 485                         printf("    msssr0         = 0x%b\n",
 486                             (int)mfspr(SPR_MSSSR0), MSSSR_BITMASK);
 487                 break;
 488         }
 489 #elif defined(BOOKE)
 490         vm_paddr_t pa;
 491
 492         switch (vector) {
 493         case EXC_MCHK:
 494                 pa = mfspr(SPR_MCARU);
 495                 pa = (pa << 32) | (u_register_t)mfspr(SPR_MCAR);
 496                 printf("   mcsr            = 0x%b\n",
 497                     (int)mfspr(SPR_MCSR), MCSR_BITMASK);
 498                 printf("   mcar            = 0x%jx\n", (uintmax_t)pa);
 499         }
 500         printf("   esr             = 0x%b\n",
 501             (int)frame->cpu.booke.esr, ESR_BITMASK);
 502 #endif
 503 }
 504
 505 static void
 506 printtrap(u_int vector, struct trapframe *frame, int isfatal, int user)
 507 {
 508
 509         printf("\n");
 510         printf("%s %s trap:\n", isfatal ? "fatal" : "handled",
 511             user ? "user" : "kernel");
 512         printf("\n");
 513         printf("   exception       = 0x%x (%s)\n", vector, trapname(vector));
 514         switch (vector) {
 515         case EXC_DSE:
 516         case EXC_DSI:
 517         case EXC_DTMISS:
 518                 printf("   virtual address = 0x%" PRIxPTR "\n", frame->dar);
 519                 break;
 520         case EXC_ISE:
 521         case EXC_ISI:
 522         case EXC_ITMISS:
 523                 printf("   virtual address = 0x%" PRIxPTR "\n", frame->srr0);
 524                 break;
 525         case EXC_MCHK:
 526                 break;
 527         }
 528         cpu_printtrap(vector, frame, isfatal, user);
 529         printf("   srr0            = 0x%" PRIxPTR " (0x%" PRIxPTR ")\n",
 530             frame->srr0, frame->srr0 - (register_t)(__startkernel - KERNBASE));
 531         printf("   srr1            = 0x%lx\n", (u_long)frame->srr1);
 532         printf("   current msr     = 0x%" PRIxPTR "\n", mfmsr());
 533         printf("   lr              = 0x%" PRIxPTR " (0x%" PRIxPTR ")\n",
 534             frame->lr, frame->lr - (register_t)(__startkernel - KERNBASE));
 535         printf("   curthread       = %p\n", curthread);
 536         if (curthread != NULL)
 537                 printf("          pid = %d, comm = %s\n",
 538                     curthread->td_proc->p_pid, curthread->td_name);
 539         printf("\n");
 540 }
 541
 542 /*
 543  * Handles a fatal fault when we have onfault state to recover.  Returns
 544  * non-zero if there was onfault recovery state available.
 545  */
 546 static int
 547 handle_onfault(struct trapframe *frame)
 548 {
 549         struct          thread *td;
 550         jmp_buf         *fb;
 551
 552         td = curthread;
 553         fb = td->td_pcb->pcb_onfault;
 554         if (fb != NULL) {
 555                 frame->srr0 = (*fb)->_jb[FAULTBUF_LR];
 556                 frame->fixreg[1] = (*fb)->_jb[FAULTBUF_R1];
 557                 frame->fixreg[2] = (*fb)->_jb[FAULTBUF_R2];
 558                 frame->fixreg[3] = 1;
 559                 frame->cr = (*fb)->_jb[FAULTBUF_CR];
 560                 bcopy(&(*fb)->_jb[FAULTBUF_R14], &frame->fixreg[14],
 561                     18 * sizeof(register_t));
 562                 td->td_pcb->pcb_onfault = NULL; /* Returns twice, not thrice */
 563                 return (1);
 564         }
 565         return (0);
 566 }
 567
 568 int
 569 cpu_fetch_syscall_args(struct thread *td)
 570 {
 571         struct proc *p;
 572         struct trapframe *frame;
 573         struct syscall_args *sa;
 574         caddr_t params;
 575         size_t argsz;
 576         int error, n, i;
 577
 578         p = td->td_proc;
 579         frame = td->td_frame;
 580         sa = &td->td_sa;
 581
 582         sa->code = frame->fixreg[0];
 583         params = (caddr_t)(frame->fixreg + FIRSTARG);
 584         n = NARGREG;
 585
 586         if (sa->code == SYS_syscall) {
 587                 /*
 588                  * code is first argument,
 589                  * followed by actual args.
 590                  */
 591                 sa->code = *(register_t *) params;
 592                 params += sizeof(register_t);
 593                 n -= 1;
 594         } else if (sa->code == SYS___syscall) {
 595                 /*
 596                  * Like syscall, but code is a quad,
 597                  * so as to maintain quad alignment
 598                  * for the rest of the args.
 599                  */
 600                 if (SV_PROC_FLAG(p, SV_ILP32)) {
 601                         params += sizeof(register_t);
 602                         sa->code = *(register_t *) params;
 603                         params += sizeof(register_t);
 604                         n -= 2;
 605                 } else {
 606                         sa->code = *(register_t *) params;
 607                         params += sizeof(register_t);
 608                         n -= 1;
 609                 }
 610         }
 611
 612         if (p->p_sysent->sv_mask)
 613                 sa->code &= p->p_sysent->sv_mask;
 614         if (sa->code >= p->p_sysent->sv_size)
 615                 sa->callp = &p->p_sysent->sv_table[0];
 616         else
 617                 sa->callp = &p->p_sysent->sv_table[sa->code];
 618
 619         sa->narg = sa->callp->sy_narg;
 620
 621         if (SV_PROC_FLAG(p, SV_ILP32)) {
 622                 argsz = sizeof(uint32_t);
 623
 624                 for (i = 0; i < n; i++)
 625                         sa->args[i] = ((u_register_t *)(params))[i] &
 626                             0xffffffff;
 627         } else {
 628                 argsz = sizeof(uint64_t);
 629
 630                 for (i = 0; i < n; i++)
 631                         sa->args[i] = ((u_register_t *)(params))[i];
 632         }
 633
 634         if (sa->narg > n)
 635                 error = copyin(MOREARGS(frame->fixreg[1]), sa->args + n,
 636                                (sa->narg - n) * argsz);
 637         else
 638                 error = 0;
 639
 640 #ifdef __powerpc64__
 641         if (SV_PROC_FLAG(p, SV_ILP32) && sa->narg > n) {
 642                 /* Expand the size of arguments copied from the stack */
 643
 644                 for (i = sa->narg; i >= n; i--)
 645                         sa->args[i] = ((uint32_t *)(&sa->args[n]))[i-n];
 646         }
 647 #endif
 648
 649         if (error == 0) {
 650                 td->td_retval[0] = 0;
 651                 td->td_retval[1] = frame->fixreg[FIRSTARG + 1];
 652         }
 653         return (error);
 654 }
 655
 656 #include "../../kern/subr_syscall.c"
 657
 658 void
 659 syscall(struct trapframe *frame)
 660 {
 661         struct thread *td;
 662         int error;
 663
 664         td = curthread;
 665         td->td_frame = frame;
 666
 667 #if defined(__powerpc64__) && defined(AIM)
 668         /*
 669          * Speculatively restore last user SLB segment, which we know is
 670          * invalid already, since we are likely to do copyin()/copyout().
 671          */
 672         if (td->td_pcb->pcb_cpu.aim.usr_vsid != 0)
 673                 __asm __volatile ("slbmte %0, %1; isync" ::
 674                     "r"(td->td_pcb->pcb_cpu.aim.usr_vsid), "r"(USER_SLB_SLBE));
 675 #endif
 676
 677         error = syscallenter(td);
 678         syscallret(td, error);
 679 }
 680
 681 #if defined(__powerpc64__) && defined(AIM)
 682 /* Handle kernel SLB faults -- runs in real mode, all seat belts off */
 683 void
 684 handle_kernel_slb_spill(int type, register_t dar, register_t srr0)
 685 {
 686         struct slb *slbcache;
 687         uint64_t slbe, slbv;
 688         uint64_t esid, addr;
 689         int i;
 690
 691         addr = (type == EXC_ISE) ? srr0 : dar;
 692         slbcache = PCPU_GET(aim.slb);
 693         esid = (uintptr_t)addr >> ADDR_SR_SHFT;
 694         slbe = (esid << SLBE_ESID_SHIFT) | SLBE_VALID;
 695
 696         /* See if the hardware flushed this somehow (can happen in LPARs) */
 697         for (i = 0; i < n_slbs; i++)
 698                 if (slbcache[i].slbe == (slbe | (uint64_t)i))
 699                         return;
 700
 701         /* Not in the map, needs to actually be added */
 702         slbv = kernel_va_to_slbv(addr);
 703         if (slbcache[USER_SLB_SLOT].slbe == 0) {
 704                 for (i = 0; i < n_slbs; i++) {
 705                         if (i == USER_SLB_SLOT)
 706                                 continue;
 707                         if (!(slbcache[i].slbe & SLBE_VALID))
 708                                 goto fillkernslb;
 709                 }
 710
 711                 if (i == n_slbs)
 712                         slbcache[USER_SLB_SLOT].slbe = 1;
 713         }
 714
 715         /* Sacrifice a random SLB entry that is not the user entry */
 716         i = mftb() % n_slbs;
 717         if (i == USER_SLB_SLOT)
 718                 i = (i+1) % n_slbs;
 719
 720 fillkernslb:
 721         /* Write new entry */
 722         slbcache[i].slbv = slbv;
 723         slbcache[i].slbe = slbe | (uint64_t)i;
 724
 725         /* Trap handler will restore from cache on exit */
 726 }
 727
 728 static int
 729 handle_user_slb_spill(pmap_t pm, vm_offset_t addr)
 730 {
 731         struct slb *user_entry;
 732         uint64_t esid;
 733         int i;
 734
 735         if (pm->pm_slb == NULL)
 736                 return (-1);
 737
 738         esid = (uintptr_t)addr >> ADDR_SR_SHFT;
 739
 740         PMAP_LOCK(pm);
 741         user_entry = user_va_to_slb_entry(pm, addr);
 742
 743         if (user_entry == NULL) {
 744                 /* allocate_vsid auto-spills it */
 745                 (void)allocate_user_vsid(pm, esid, 0);
 746         } else {
 747                 /*
 748                  * Check that another CPU has not already mapped this.
 749                  * XXX: Per-thread SLB caches would be better.
 750                  */
 751                 for (i = 0; i < pm->pm_slb_len; i++)
 752                         if (pm->pm_slb[i] == user_entry)
 753                                 break;
 754
 755                 if (i == pm->pm_slb_len)
 756                         slb_insert_user(pm, user_entry);
 757         }
 758         PMAP_UNLOCK(pm);
 759
 760         return (0);
 761 }
 762 #endif
 763
 764 static int
 765 trap_pfault(struct trapframe *frame, int user)
 766 {
 767         vm_offset_t     eva, va;
 768         struct          thread *td;
 769         struct          proc *p;
 770         vm_map_t        map;
 771         vm_prot_t       ftype;
 772         int             rv, is_user;
 773
 774         td = curthread;
 775         p = td->td_proc;
 776         if (frame->exc == EXC_ISI) {
 777                 eva = frame->srr0;
 778                 ftype = VM_PROT_EXECUTE;
 779                 if (frame->srr1 & SRR1_ISI_PFAULT)
 780                         ftype |= VM_PROT_READ;
 781         } else {
 782                 eva = frame->dar;
 783 #ifdef BOOKE
 784                 if (frame->cpu.booke.esr & ESR_ST)
 785 #else
 786                 if (frame->cpu.aim.dsisr & DSISR_STORE)
 787 #endif
 788                         ftype = VM_PROT_WRITE;
 789                 else
 790                         ftype = VM_PROT_READ;
 791         }
 792
 793         if (user) {
 794                 KASSERT(p->p_vmspace != NULL, ("trap_pfault: vmspace  NULL"));
 795                 map = &p->p_vmspace->vm_map;
 796         } else {
 797                 rv = pmap_decode_kernel_ptr(eva, &is_user, &eva);
 798                 if (rv != 0)
 799                         return (SIGSEGV);
 800
 801                 if (is_user)
 802                         map = &p->p_vmspace->vm_map;
 803                 else
 804                         map = kernel_map;
 805         }
 806         va = trunc_page(eva);
 807
 808         /* Fault in the page. */
 809         rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL);
 810         /*
 811          * XXXDTRACE: add dtrace_doubletrap_func here?
 812          */
 813
 814         if (rv == KERN_SUCCESS)
 815                 return (0);
 816
 817         if (!user && handle_onfault(frame))
 818                 return (0);
 819
 820         return (SIGSEGV);
 821 }
 822
 823 /*
 824  * For now, this only deals with the particular unaligned access case
 825  * that gcc tends to generate.  Eventually it should handle all of the
 826  * possibilities that can happen on a 32-bit PowerPC in big-endian mode.
 827  */
 828
 829 static int
 830 fix_unaligned(struct thread *td, struct trapframe *frame)
 831 {
 832         struct thread   *fputhread;
 833 #ifdef  __SPE__
 834         uint32_t        inst;
 835 #endif
 836         int             indicator, reg;
 837         double          *fpr;
 838
 839 #ifdef __SPE__
 840         indicator = (frame->cpu.booke.esr & (ESR_ST|ESR_SPE));
 841         if (indicator & ESR_SPE) {
 842                 if (copyin((void *)frame->srr0, &inst, sizeof(inst)) != 0)
 843                         return (-1);
 844                 reg = EXC_ALI_SPE_REG(inst);
 845                 fpr = (double *)td->td_pcb->pcb_vec.vr[reg];
 846                 fputhread = PCPU_GET(vecthread);
 847
 848                 /* Juggle the SPE to ensure that we've initialized
 849                  * the registers, and that their current state is in
 850                  * the PCB.
 851                  */
 852                 if (fputhread != td) {
 853                         if (fputhread)
 854                                 save_vec(fputhread);
 855                         enable_vec(td);
 856                 }
 857                 save_vec(td);
 858
 859                 if (!(indicator & ESR_ST)) {
 860                         if (copyin((void *)frame->dar, fpr,
 861                             sizeof(double)) != 0)
 862                                 return (-1);
 863                         frame->fixreg[reg] = td->td_pcb->pcb_vec.vr[reg][1];
 864                         enable_vec(td);
 865                 } else {
 866                         td->td_pcb->pcb_vec.vr[reg][1] = frame->fixreg[reg];
 867                         if (copyout(fpr, (void *)frame->dar,
 868                             sizeof(double)) != 0)
 869                                 return (-1);
 870                 }
 871                 return (0);
 872         }
 873 #else
 874         indicator = EXC_ALI_OPCODE_INDICATOR(frame->cpu.aim.dsisr);
 875
 876         switch (indicator) {
 877         case EXC_ALI_LFD:
 878         case EXC_ALI_STFD:
 879                 reg = EXC_ALI_RST(frame->cpu.aim.dsisr);
 880                 fpr = &td->td_pcb->pcb_fpu.fpr[reg].fpr;
 881                 fputhread = PCPU_GET(fputhread);
 882
 883                 /* Juggle the FPU to ensure that we've initialized
 884                  * the FPRs, and that their current state is in
 885                  * the PCB.
 886                  */
 887                 if (fputhread != td) {
 888                         if (fputhread)
 889                                 save_fpu(fputhread);
 890                         enable_fpu(td);
 891                 }
 892                 save_fpu(td);
 893
 894                 if (indicator == EXC_ALI_LFD) {
 895                         if (copyin((void *)frame->dar, fpr,
 896                             sizeof(double)) != 0)
 897                                 return (-1);
 898                         enable_fpu(td);
 899                 } else {
 900                         if (copyout(fpr, (void *)frame->dar,
 901                             sizeof(double)) != 0)
 902                                 return (-1);
 903                 }
 904                 return (0);
 905                 break;
 906         }
 907 #endif
 908
 909         return (-1);
 910 }
 911
 912 #ifdef KDB
 913 int
 914 db_trap_glue(struct trapframe *frame)
 915 {
 916
 917         if (!(frame->srr1 & PSL_PR)
 918             && (frame->exc == EXC_TRC || frame->exc == EXC_RUNMODETRC
 919                 || frame_is_trap_inst(frame)
 920                 || frame->exc == EXC_BPT
 921                 || frame->exc == EXC_DEBUG
 922                 || frame->exc == EXC_DSI)) {
 923                 int type = frame->exc;
 924
 925                 /* Ignore DTrace traps. */
 926                 if (*(uint32_t *)frame->srr0 == EXC_DTRACE)
 927                         return (0);
 928                 if (frame_is_trap_inst(frame)) {
 929                         type = T_BREAKPOINT;
 930                 }
 931                 return (kdb_trap(type, 0, frame));
 932         }
 933
 934         return (0);
 935 }
 936 #endif