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->exc == EXC_DEBUG || frame->cpu.booke.esr & ESR_PTR);
 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
 208         VM_CNT_INC(v_trap);
 209
 210         td = curthread;
 211         p = td->td_proc;
 212
 213         type = ucode = frame->exc;
 214         sig = 0;
 215         user = frame->srr1 & PSL_PR;
 216
 217         CTR3(KTR_TRAP, "trap: %s type=%s (%s)", td->td_name,
 218             trapname(type), user ? "user" : "kernel");
 219
 220 #ifdef KDTRACE_HOOKS
 221         /*
 222          * A trap can occur while DTrace executes a probe. Before
 223          * executing the probe, DTrace blocks re-scheduling and sets
 224          * a flag in its per-cpu flags to indicate that it doesn't
 225          * want to fault. On returning from the probe, the no-fault
 226          * flag is cleared and finally re-scheduling is enabled.
 227          *
 228          * If the DTrace kernel module has registered a trap handler,
 229          * call it and if it returns non-zero, assume that it has
 230          * handled the trap and modified the trap frame so that this
 231          * function can return normally.
 232          */
 233         if (dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, type) != 0)
 234                 return;
 235 #endif
 236
 237         if (user) {
 238                 td->td_pticks = 0;
 239                 td->td_frame = frame;
 240                 if (td->td_cowgen != p->p_cowgen)
 241                         thread_cow_update(td);
 242
 243                 /* User Mode Traps */
 244                 switch (type) {
 245                 case EXC_RUNMODETRC:
 246                 case EXC_TRC:
 247                         frame->srr1 &= ~PSL_SE;
 248                         sig = SIGTRAP;
 249                         ucode = TRAP_TRACE;
 250                         break;
 251
 252 #if defined(__powerpc64__) && defined(AIM)
 253                 case EXC_ISE:
 254                 case EXC_DSE:
 255                         if (handle_user_slb_spill(&p->p_vmspace->vm_pmap,
 256                             (type == EXC_ISE) ? frame->srr0 : frame->dar) != 0){
 257                                 sig = SIGSEGV;
 258                                 ucode = SEGV_MAPERR;
 259                         }
 260                         break;
 261 #endif
 262                 case EXC_DSI:
 263                 case EXC_ISI:
 264                         sig = trap_pfault(frame, 1);
 265                         if (sig == SIGSEGV)
 266                                 ucode = SEGV_MAPERR;
 267                         break;
 268
 269                 case EXC_SC:
 270                         syscall(frame);
 271                         break;
 272
 273                 case EXC_FPU:
 274                         KASSERT((td->td_pcb->pcb_flags & PCB_FPU) != PCB_FPU,
 275                             ("FPU already enabled for thread"));
 276                         enable_fpu(td);
 277                         break;
 278
 279                 case EXC_VEC:
 280                         KASSERT((td->td_pcb->pcb_flags & PCB_VEC) != PCB_VEC,
 281                             ("Altivec already enabled for thread"));
 282                         enable_vec(td);
 283                         break;
 284
 285                 case EXC_VSX:
 286                         KASSERT((td->td_pcb->pcb_flags & PCB_VSX) != PCB_VSX,
 287                             ("VSX already enabled for thread"));
 288                         if (!(td->td_pcb->pcb_flags & PCB_VEC))
 289                                 enable_vec(td);
 290                         if (!(td->td_pcb->pcb_flags & PCB_FPU))
 291                                 save_fpu(td);
 292                         td->td_pcb->pcb_flags |= PCB_VSX;
 293                         enable_fpu(td);
 294                         break;
 295
 296                 case EXC_FAC:
 297                 case EXC_HEA:
 298                         sig = SIGILL;
 299                         ucode = ILL_ILLOPC;
 300                         break;
 301
 302                 case EXC_VECAST_E:
 303                 case EXC_VECAST_G4:
 304                 case EXC_VECAST_G5:
 305                         /*
 306                          * We get a VPU assist exception for IEEE mode
 307                          * vector operations on denormalized floats.
 308                          * Emulating this is a giant pain, so for now,
 309                          * just switch off IEEE mode and treat them as
 310                          * zero.
 311                          */
 312
 313                         save_vec(td);
 314                         td->td_pcb->pcb_vec.vscr |= ALTIVEC_VSCR_NJ;
 315                         enable_vec(td);
 316                         break;
 317
 318                 case EXC_ALI:
 319                         if (fix_unaligned(td, frame) != 0) {
 320                                 sig = SIGBUS;
 321                                 ucode = BUS_ADRALN;
 322                         }
 323                         else
 324                                 frame->srr0 += 4;
 325                         break;
 326
 327                 case EXC_DEBUG: /* Single stepping */
 328                         mtspr(SPR_DBSR, mfspr(SPR_DBSR));
 329                         frame->srr1 &= ~PSL_DE;
 330                         frame->cpu.booke.dbcr0 &= ~(DBCR0_IDM | DBCR0_IC);
 331                         sig = SIGTRAP;
 332                         ucode = TRAP_TRACE;
 333                         break;
 334
 335                 case EXC_PGM:
 336                         /* Identify the trap reason */
 337                         if (frame_is_trap_inst(frame)) {
 338 #ifdef KDTRACE_HOOKS
 339                                 inst = fuword32((const void *)frame->srr0);
 340                                 if (inst == 0x0FFFDDDD &&
 341                                     dtrace_pid_probe_ptr != NULL) {
 342                                         (*dtrace_pid_probe_ptr)(frame);
 343                                         break;
 344                                 }
 345 #endif
 346                                 sig = SIGTRAP;
 347                                 ucode = TRAP_BRKPT;
 348                         } else {
 349                                 sig = ppc_instr_emulate(frame, td->td_pcb);
 350                                 if (sig == SIGILL) {
 351                                         if (frame->srr1 & EXC_PGM_PRIV)
 352                                                 ucode = ILL_PRVOPC;
 353                                         else if (frame->srr1 & EXC_PGM_ILLEGAL)
 354                                                 ucode = ILL_ILLOPC;
 355                                 } else if (sig == SIGFPE)
 356                                         ucode = FPE_FLTINV;     /* Punt for now, invalid operation. */
 357                         }
 358                         break;
 359
 360                 case EXC_MCHK:
 361                         /*
 362                          * Note that this may not be recoverable for the user
 363                          * process, depending on the type of machine check,
 364                          * but it at least prevents the kernel from dying.
 365                          */
 366                         sig = SIGBUS;
 367                         ucode = BUS_OBJERR;
 368                         break;
 369
 370                 default:
 371                         trap_fatal(frame);
 372                 }
 373         } else {
 374                 /* Kernel Mode Traps */
 375
 376                 KASSERT(cold || td->td_ucred != NULL,
 377                     ("kernel trap doesn't have ucred"));
 378                 switch (type) {
 379                 case EXC_PGM:
 380 #ifdef KDTRACE_HOOKS
 381                         if (frame_is_trap_inst(frame)) {
 382                                 if (*(uint32_t *)frame->srr0 == EXC_DTRACE) {
 383                                         if (dtrace_invop_jump_addr != NULL) {
 384                                                 dtrace_invop_jump_addr(frame);
 385                                                 return;
 386                                         }
 387                                 }
 388                         }
 389 #endif
 390 #ifdef KDB
 391                         if (db_trap_glue(frame))
 392                                 return;
 393 #endif
 394                         break;
 395 #if defined(__powerpc64__) && defined(AIM)
 396                 case EXC_DSE:
 397                         if (td->td_pcb->pcb_cpu.aim.usr_vsid != 0 &&
 398                             (frame->dar & SEGMENT_MASK) == USER_ADDR) {
 399                                 __asm __volatile ("slbmte %0, %1" ::
 400                                         "r"(td->td_pcb->pcb_cpu.aim.usr_vsid),
 401                                         "r"(USER_SLB_SLBE));
 402                                 return;
 403                         }
 404                         break;
 405 #endif
 406                 case EXC_DSI:
 407                         if (trap_pfault(frame, 0) == 0)
 408                                 return;
 409                         break;
 410                 case EXC_MCHK:
 411                         if (handle_onfault(frame))
 412                                 return;
 413                         break;
 414                 default:
 415                         break;
 416                 }
 417                 trap_fatal(frame);
 418         }
 419
 420         if (sig != 0) {
 421                 if (p->p_sysent->sv_transtrap != NULL)
 422                         sig = (p->p_sysent->sv_transtrap)(sig, type);
 423                 ksiginfo_init_trap(&ksi);
 424                 ksi.ksi_signo = sig;
 425                 ksi.ksi_code = (int) ucode; /* XXX, not POSIX */
 426                 /* ksi.ksi_addr = ? */
 427                 ksi.ksi_trapno = type;
 428                 trapsignal(td, &ksi);
 429         }
 430
 431         userret(td, frame);
 432 }
 433
 434 static void
 435 trap_fatal(struct trapframe *frame)
 436 {
 437
 438         printtrap(frame->exc, frame, 1, (frame->srr1 & PSL_PR));
 439 #ifdef KDB
 440         if ((debugger_on_panic || kdb_active) &&
 441             kdb_trap(frame->exc, 0, frame))
 442                 return;
 443 #endif
 444         panic("%s trap", trapname(frame->exc));
 445 }
 446
 447 static void
 448 cpu_printtrap(u_int vector, struct trapframe *frame, int isfatal, int user)
 449 {
 450 #ifdef AIM
 451         uint16_t ver;
 452
 453         switch (vector) {
 454         case EXC_DSE:
 455         case EXC_DSI:
 456         case EXC_DTMISS:
 457                 printf("   dsisr           = 0x%lx\n",
 458                     (u_long)frame->cpu.aim.dsisr);
 459                 break;
 460         case EXC_MCHK:
 461                 ver = mfpvr() >> 16;
 462                 if (MPC745X_P(ver))
 463                         printf("    msssr0         = 0x%b\n",
 464                             (int)mfspr(SPR_MSSSR0), MSSSR_BITMASK);
 465                 break;
 466         }
 467 #elif defined(BOOKE)
 468         vm_paddr_t pa;
 469
 470         switch (vector) {
 471         case EXC_MCHK:
 472                 pa = mfspr(SPR_MCARU);
 473                 pa = (pa << 32) | (u_register_t)mfspr(SPR_MCAR);
 474                 printf("   mcsr            = 0x%b\n",
 475                     (int)mfspr(SPR_MCSR), MCSR_BITMASK);
 476                 printf("   mcar            = 0x%jx\n", (uintmax_t)pa);
 477         }
 478         printf("   esr             = 0x%b\n",
 479             (int)frame->cpu.booke.esr, ESR_BITMASK);
 480 #endif
 481 }
 482
 483 static void
 484 printtrap(u_int vector, struct trapframe *frame, int isfatal, int user)
 485 {
 486
 487         printf("\n");
 488         printf("%s %s trap:\n", isfatal ? "fatal" : "handled",
 489             user ? "user" : "kernel");
 490         printf("\n");
 491         printf("   exception       = 0x%x (%s)\n", vector, trapname(vector));
 492         switch (vector) {
 493         case EXC_DSE:
 494         case EXC_DSI:
 495         case EXC_DTMISS:
 496                 printf("   virtual address = 0x%" PRIxPTR "\n", frame->dar);
 497                 break;
 498         case EXC_ISE:
 499         case EXC_ISI:
 500         case EXC_ITMISS:
 501                 printf("   virtual address = 0x%" PRIxPTR "\n", frame->srr0);
 502                 break;
 503         case EXC_MCHK:
 504                 break;
 505         }
 506         cpu_printtrap(vector, frame, isfatal, user);
 507         printf("   srr0            = 0x%" PRIxPTR " (0x%" PRIxPTR ")\n",
 508             frame->srr0, frame->srr0 - (register_t)(__startkernel - KERNBASE));
 509         printf("   srr1            = 0x%lx\n", (u_long)frame->srr1);
 510         printf("   lr              = 0x%" PRIxPTR " (0x%" PRIxPTR ")\n",
 511             frame->lr, frame->lr - (register_t)(__startkernel - KERNBASE));
 512         printf("   curthread       = %p\n", curthread);
 513         if (curthread != NULL)
 514                 printf("          pid = %d, comm = %s\n",
 515                     curthread->td_proc->p_pid, curthread->td_name);
 516         printf("\n");
 517 }
 518
 519 /*
 520  * Handles a fatal fault when we have onfault state to recover.  Returns
 521  * non-zero if there was onfault recovery state available.
 522  */
 523 static int
 524 handle_onfault(struct trapframe *frame)
 525 {
 526         struct          thread *td;
 527         jmp_buf         *fb;
 528
 529         td = curthread;
 530         fb = td->td_pcb->pcb_onfault;
 531         if (fb != NULL) {
 532                 frame->srr0 = (*fb)->_jb[FAULTBUF_LR];
 533                 frame->fixreg[1] = (*fb)->_jb[FAULTBUF_R1];
 534                 frame->fixreg[2] = (*fb)->_jb[FAULTBUF_R2];
 535                 frame->fixreg[3] = 1;
 536                 frame->cr = (*fb)->_jb[FAULTBUF_CR];
 537                 bcopy(&(*fb)->_jb[FAULTBUF_R14], &frame->fixreg[14],
 538                     18 * sizeof(register_t));
 539                 td->td_pcb->pcb_onfault = NULL; /* Returns twice, not thrice */
 540                 return (1);
 541         }
 542         return (0);
 543 }
 544
 545 int
 546 cpu_fetch_syscall_args(struct thread *td)
 547 {
 548         struct proc *p;
 549         struct trapframe *frame;
 550         struct syscall_args *sa;
 551         caddr_t params;
 552         size_t argsz;
 553         int error, n, i;
 554
 555         p = td->td_proc;
 556         frame = td->td_frame;
 557         sa = &td->td_sa;
 558
 559         sa->code = frame->fixreg[0];
 560         params = (caddr_t)(frame->fixreg + FIRSTARG);
 561         n = NARGREG;
 562
 563         if (sa->code == SYS_syscall) {
 564                 /*
 565                  * code is first argument,
 566                  * followed by actual args.
 567                  */
 568                 sa->code = *(register_t *) params;
 569                 params += sizeof(register_t);
 570                 n -= 1;
 571         } else if (sa->code == SYS___syscall) {
 572                 /*
 573                  * Like syscall, but code is a quad,
 574                  * so as to maintain quad alignment
 575                  * for the rest of the args.
 576                  */
 577                 if (SV_PROC_FLAG(p, SV_ILP32)) {
 578                         params += sizeof(register_t);
 579                         sa->code = *(register_t *) params;
 580                         params += sizeof(register_t);
 581                         n -= 2;
 582                 } else {
 583                         sa->code = *(register_t *) params;
 584                         params += sizeof(register_t);
 585                         n -= 1;
 586                 }
 587         }
 588
 589         if (p->p_sysent->sv_mask)
 590                 sa->code &= p->p_sysent->sv_mask;
 591         if (sa->code >= p->p_sysent->sv_size)
 592                 sa->callp = &p->p_sysent->sv_table[0];
 593         else
 594                 sa->callp = &p->p_sysent->sv_table[sa->code];
 595
 596         sa->narg = sa->callp->sy_narg;
 597
 598         if (SV_PROC_FLAG(p, SV_ILP32)) {
 599                 argsz = sizeof(uint32_t);
 600
 601                 for (i = 0; i < n; i++)
 602                         sa->args[i] = ((u_register_t *)(params))[i] &
 603                             0xffffffff;
 604         } else {
 605                 argsz = sizeof(uint64_t);
 606
 607                 for (i = 0; i < n; i++)
 608                         sa->args[i] = ((u_register_t *)(params))[i];
 609         }
 610
 611         if (sa->narg > n)
 612                 error = copyin(MOREARGS(frame->fixreg[1]), sa->args + n,
 613                                (sa->narg - n) * argsz);
 614         else
 615                 error = 0;
 616
 617 #ifdef __powerpc64__
 618         if (SV_PROC_FLAG(p, SV_ILP32) && sa->narg > n) {
 619                 /* Expand the size of arguments copied from the stack */
 620
 621                 for (i = sa->narg; i >= n; i--)
 622                         sa->args[i] = ((uint32_t *)(&sa->args[n]))[i-n];
 623         }
 624 #endif
 625
 626         if (error == 0) {
 627                 td->td_retval[0] = 0;
 628                 td->td_retval[1] = frame->fixreg[FIRSTARG + 1];
 629         }
 630         return (error);
 631 }
 632
 633 #include "../../kern/subr_syscall.c"
 634
 635 void
 636 syscall(struct trapframe *frame)
 637 {
 638         struct thread *td;
 639         int error;
 640
 641         td = curthread;
 642         td->td_frame = frame;
 643
 644 #if defined(__powerpc64__) && defined(AIM)
 645         /*
 646          * Speculatively restore last user SLB segment, which we know is
 647          * invalid already, since we are likely to do copyin()/copyout().
 648          */
 649         if (td->td_pcb->pcb_cpu.aim.usr_vsid != 0)
 650                 __asm __volatile ("slbmte %0, %1; isync" ::
 651                     "r"(td->td_pcb->pcb_cpu.aim.usr_vsid), "r"(USER_SLB_SLBE));
 652 #endif
 653
 654         error = syscallenter(td);
 655         syscallret(td, error);
 656 }
 657
 658 #if defined(__powerpc64__) && defined(AIM)
 659 /* Handle kernel SLB faults -- runs in real mode, all seat belts off */
 660 void
 661 handle_kernel_slb_spill(int type, register_t dar, register_t srr0)
 662 {
 663         struct slb *slbcache;
 664         uint64_t slbe, slbv;
 665         uint64_t esid, addr;
 666         int i;
 667
 668         addr = (type == EXC_ISE) ? srr0 : dar;
 669         slbcache = PCPU_GET(aim.slb);
 670         esid = (uintptr_t)addr >> ADDR_SR_SHFT;
 671         slbe = (esid << SLBE_ESID_SHIFT) | SLBE_VALID;
 672
 673         /* See if the hardware flushed this somehow (can happen in LPARs) */
 674         for (i = 0; i < n_slbs; i++)
 675                 if (slbcache[i].slbe == (slbe | (uint64_t)i))
 676                         return;
 677
 678         /* Not in the map, needs to actually be added */
 679         slbv = kernel_va_to_slbv(addr);
 680         if (slbcache[USER_SLB_SLOT].slbe == 0) {
 681                 for (i = 0; i < n_slbs; i++) {
 682                         if (i == USER_SLB_SLOT)
 683                                 continue;
 684                         if (!(slbcache[i].slbe & SLBE_VALID))
 685                                 goto fillkernslb;
 686                 }
 687
 688                 if (i == n_slbs)
 689                         slbcache[USER_SLB_SLOT].slbe = 1;
 690         }
 691
 692         /* Sacrifice a random SLB entry that is not the user entry */
 693         i = mftb() % n_slbs;
 694         if (i == USER_SLB_SLOT)
 695                 i = (i+1) % n_slbs;
 696
 697 fillkernslb:
 698         /* Write new entry */
 699         slbcache[i].slbv = slbv;
 700         slbcache[i].slbe = slbe | (uint64_t)i;
 701
 702         /* Trap handler will restore from cache on exit */
 703 }
 704
 705 static int
 706 handle_user_slb_spill(pmap_t pm, vm_offset_t addr)
 707 {
 708         struct slb *user_entry;
 709         uint64_t esid;
 710         int i;
 711
 712         if (pm->pm_slb == NULL)
 713                 return (-1);
 714
 715         esid = (uintptr_t)addr >> ADDR_SR_SHFT;
 716
 717         PMAP_LOCK(pm);
 718         user_entry = user_va_to_slb_entry(pm, addr);
 719
 720         if (user_entry == NULL) {
 721                 /* allocate_vsid auto-spills it */
 722                 (void)allocate_user_vsid(pm, esid, 0);
 723         } else {
 724                 /*
 725                  * Check that another CPU has not already mapped this.
 726                  * XXX: Per-thread SLB caches would be better.
 727                  */
 728                 for (i = 0; i < pm->pm_slb_len; i++)
 729                         if (pm->pm_slb[i] == user_entry)
 730                                 break;
 731
 732                 if (i == pm->pm_slb_len)
 733                         slb_insert_user(pm, user_entry);
 734         }
 735         PMAP_UNLOCK(pm);
 736
 737         return (0);
 738 }
 739 #endif
 740
 741 static int
 742 trap_pfault(struct trapframe *frame, int user)
 743 {
 744         vm_offset_t     eva, va;
 745         struct          thread *td;
 746         struct          proc *p;
 747         vm_map_t        map;
 748         vm_prot_t       ftype;
 749         int             rv, is_user;
 750
 751         td = curthread;
 752         p = td->td_proc;
 753         if (frame->exc == EXC_ISI) {
 754                 eva = frame->srr0;
 755                 ftype = VM_PROT_EXECUTE;
 756                 if (frame->srr1 & SRR1_ISI_PFAULT)
 757                         ftype |= VM_PROT_READ;
 758         } else {
 759                 eva = frame->dar;
 760 #ifdef BOOKE
 761                 if (frame->cpu.booke.esr & ESR_ST)
 762 #else
 763                 if (frame->cpu.aim.dsisr & DSISR_STORE)
 764 #endif
 765                         ftype = VM_PROT_WRITE;
 766                 else
 767                         ftype = VM_PROT_READ;
 768         }
 769
 770         if (user) {
 771                 KASSERT(p->p_vmspace != NULL, ("trap_pfault: vmspace  NULL"));
 772                 map = &p->p_vmspace->vm_map;
 773         } else {
 774                 rv = pmap_decode_kernel_ptr(eva, &is_user, &eva);
 775                 if (rv != 0)
 776                         return (SIGSEGV);
 777
 778                 if (is_user)
 779                         map = &p->p_vmspace->vm_map;
 780                 else
 781                         map = kernel_map;
 782         }
 783         va = trunc_page(eva);
 784
 785         /* Fault in the page. */
 786         rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL);
 787         /*
 788          * XXXDTRACE: add dtrace_doubletrap_func here?
 789          */
 790
 791         if (rv == KERN_SUCCESS)
 792                 return (0);
 793
 794         if (!user && handle_onfault(frame))
 795                 return (0);
 796
 797         return (SIGSEGV);
 798 }
 799
 800 /*
 801  * For now, this only deals with the particular unaligned access case
 802  * that gcc tends to generate.  Eventually it should handle all of the
 803  * possibilities that can happen on a 32-bit PowerPC in big-endian mode.
 804  */
 805
 806 static int
 807 fix_unaligned(struct thread *td, struct trapframe *frame)
 808 {
 809         struct thread   *fputhread;
 810 #ifdef  __SPE__
 811         uint32_t        inst;
 812 #endif
 813         int             indicator, reg;
 814         double          *fpr;
 815
 816 #ifdef __SPE__
 817         indicator = (frame->cpu.booke.esr & (ESR_ST|ESR_SPE));
 818         if (indicator & ESR_SPE) {
 819                 if (copyin((void *)frame->srr0, &inst, sizeof(inst)) != 0)
 820                         return (-1);
 821                 reg = EXC_ALI_SPE_REG(inst);
 822                 fpr = (double *)td->td_pcb->pcb_vec.vr[reg];
 823                 fputhread = PCPU_GET(vecthread);
 824
 825                 /* Juggle the SPE to ensure that we've initialized
 826                  * the registers, and that their current state is in
 827                  * the PCB.
 828                  */
 829                 if (fputhread != td) {
 830                         if (fputhread)
 831                                 save_vec(fputhread);
 832                         enable_vec(td);
 833                 }
 834                 save_vec(td);
 835
 836                 if (!(indicator & ESR_ST)) {
 837                         if (copyin((void *)frame->dar, fpr,
 838                             sizeof(double)) != 0)
 839                                 return (-1);
 840                         frame->fixreg[reg] = td->td_pcb->pcb_vec.vr[reg][1];
 841                         enable_vec(td);
 842                 } else {
 843                         td->td_pcb->pcb_vec.vr[reg][1] = frame->fixreg[reg];
 844                         if (copyout(fpr, (void *)frame->dar,
 845                             sizeof(double)) != 0)
 846                                 return (-1);
 847                 }
 848                 return (0);
 849         }
 850 #else
 851         indicator = EXC_ALI_OPCODE_INDICATOR(frame->cpu.aim.dsisr);
 852
 853         switch (indicator) {
 854         case EXC_ALI_LFD:
 855         case EXC_ALI_STFD:
 856                 reg = EXC_ALI_RST(frame->cpu.aim.dsisr);
 857                 fpr = &td->td_pcb->pcb_fpu.fpr[reg].fpr;
 858                 fputhread = PCPU_GET(fputhread);
 859
 860                 /* Juggle the FPU to ensure that we've initialized
 861                  * the FPRs, and that their current state is in
 862                  * the PCB.
 863                  */
 864                 if (fputhread != td) {
 865                         if (fputhread)
 866                                 save_fpu(fputhread);
 867                         enable_fpu(td);
 868                 }
 869                 save_fpu(td);
 870
 871                 if (indicator == EXC_ALI_LFD) {
 872                         if (copyin((void *)frame->dar, fpr,
 873                             sizeof(double)) != 0)
 874                                 return (-1);
 875                         enable_fpu(td);
 876                 } else {
 877                         if (copyout(fpr, (void *)frame->dar,
 878                             sizeof(double)) != 0)
 879                                 return (-1);
 880                 }
 881                 return (0);
 882                 break;
 883         }
 884 #endif
 885
 886         return (-1);
 887 }
 888
 889 #ifdef KDB
 890 int
 891 db_trap_glue(struct trapframe *frame)
 892 {
 893
 894         if (!(frame->srr1 & PSL_PR)
 895             && (frame->exc == EXC_TRC || frame->exc == EXC_RUNMODETRC
 896                 || frame_is_trap_inst(frame)
 897                 || frame->exc == EXC_BPT
 898                 || frame->exc == EXC_DSI)) {
 899                 int type = frame->exc;
 900
 901                 /* Ignore DTrace traps. */
 902                 if (*(uint32_t *)frame->srr0 == EXC_DTRACE)
 903                         return (0);
 904                 if (frame_is_trap_inst(frame)) {
 905                         type = T_BREAKPOINT;
 906                 }
 907                 return (kdb_trap(type, 0, frame));
 908         }
 909
 910         return (0);
 911 }
 912 #endif