trap.c revision 1.77
1/* $NetBSD: trap.c,v 1.77 2009/10/26 19:16:57 cegger Exp $ */ 2 3/* 4 * This file was taken from mvme68k/mvme68k/trap.c 5 * should probably be re-synced when needed. 6 * Darrin B. Jewell <jewell@mit.edu> Tue Aug 3 10:53:12 UTC 1999 7 * original cvs id: NetBSD: trap.c,v 1.32 1999/08/03 10:52:06 dbj Exp 8 */ 9 10/* 11 * Copyright (c) 1982, 1986, 1990, 1993 12 * The Regents of the University of California. All rights reserved. 13 * 14 * This code is derived from software contributed to Berkeley by 15 * the Systems Programming Group of the University of Utah Computer 16 * Science Department. 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions 20 * are met: 21 * 1. Redistributions of source code must retain the above copyright 22 * notice, this list of conditions and the following disclaimer. 23 * 2. Redistributions in binary form must reproduce the above copyright 24 * notice, this list of conditions and the following disclaimer in the 25 * documentation and/or other materials provided with the distribution. 26 * 3. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 * 42 * from: Utah $Hdr: trap.c 1.37 92/12/20$ 43 * 44 * @(#)trap.c 8.5 (Berkeley) 1/4/94 45 */ 46/* 47 * Copyright (c) 1988 University of Utah. 48 * 49 * This code is derived from software contributed to Berkeley by 50 * the Systems Programming Group of the University of Utah Computer 51 * Science Department. 52 * 53 * Redistribution and use in source and binary forms, with or without 54 * modification, are permitted provided that the following conditions 55 * are met: 56 * 1. Redistributions of source code must retain the above copyright 57 * notice, this list of conditions and the following disclaimer. 58 * 2. Redistributions in binary form must reproduce the above copyright 59 * notice, this list of conditions and the following disclaimer in the 60 * documentation and/or other materials provided with the distribution. 61 * 3. All advertising materials mentioning features or use of this software 62 * must display the following acknowledgement: 63 * This product includes software developed by the University of 64 * California, Berkeley and its contributors. 65 * 4. Neither the name of the University nor the names of its contributors 66 * may be used to endorse or promote products derived from this software 67 * without specific prior written permission. 68 * 69 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 70 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 71 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 72 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 73 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 74 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 75 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 76 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 77 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 78 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 79 * SUCH DAMAGE. 80 * 81 * from: Utah $Hdr: trap.c 1.37 92/12/20$ 82 * 83 * @(#)trap.c 8.5 (Berkeley) 1/4/94 84 */ 85 86#include <sys/cdefs.h> 87__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.77 2009/10/26 19:16:57 cegger Exp $"); 88 89#include "opt_ddb.h" 90#include "opt_execfmt.h" 91#include "opt_kgdb.h" 92#include "opt_compat_sunos.h" 93 94#include <sys/param.h> 95#include <sys/systm.h> 96#include <sys/proc.h> 97#include <sys/acct.h> 98#include <sys/kernel.h> 99#include <sys/signalvar.h> 100#include <sys/resourcevar.h> 101#include <sys/sa.h> 102#include <sys/savar.h> 103#include <sys/syscall.h> 104#include <sys/syslog.h> 105#include <sys/user.h> 106#include <sys/userret.h> 107#include <sys/kauth.h> 108 109#ifdef DEBUG 110#include <dev/cons.h> 111#endif 112 113#include <machine/db_machdep.h> 114#include <machine/psl.h> 115#include <machine/trap.h> 116#include <machine/cpu.h> 117#include <machine/reg.h> 118 119#include <m68k/cacheops.h> 120 121#include <uvm/uvm_extern.h> 122 123#ifdef COMPAT_SUNOS 124#include <compat/sunos/sunos_syscall.h> 125extern struct emul emul_sunos; 126#endif 127 128#ifdef KGDB 129#include <sys/kgdb.h> 130#endif 131 132int writeback(struct frame *, int); 133void trap(struct frame *, int, u_int, u_int); 134 135#ifdef DEBUG 136void dumpssw(u_short); 137void dumpwb(int, u_short, u_int, u_int); 138#endif 139 140static inline void userret(struct lwp *, struct frame *, u_quad_t, u_int, int); 141 142int astpending; 143 144const char *trap_type[] = { 145 "Bus error", 146 "Address error", 147 "Illegal instruction", 148 "Zero divide", 149 "CHK instruction", 150 "TRAPV instruction", 151 "Privilege violation", 152 "Trace trap", 153 "MMU fault", 154 "SSIR trap", 155 "Format error", 156 "68881 exception", 157 "Coprocessor violation", 158 "Async system trap" 159}; 160int trap_types = sizeof trap_type / sizeof trap_type[0]; 161 162/* 163 * Size of various exception stack frames (minus the standard 8 bytes) 164 */ 165short exframesize[] = { 166 FMT0SIZE, /* type 0 - normal (68020/030/040/060) */ 167 FMT1SIZE, /* type 1 - throwaway (68020/030/040) */ 168 FMT2SIZE, /* type 2 - normal 6-word (68020/030/040/060) */ 169 FMT3SIZE, /* type 3 - FP post-instruction (68040/060) */ 170 FMT4SIZE, /* type 4 - access error/fp disabled (68060) */ 171 -1, -1, /* type 5-6 - undefined */ 172 FMT7SIZE, /* type 7 - access error (68040) */ 173 58, /* type 8 - bus fault (68010) */ 174 FMT9SIZE, /* type 9 - coprocessor mid-instruction (68020/030) */ 175 FMTASIZE, /* type A - short bus fault (68020/030) */ 176 FMTBSIZE, /* type B - long bus fault (68020/030) */ 177 -1, -1, -1, -1 /* type C-F - undefined */ 178}; 179 180#ifdef M68060 181#define KDFAULT_060(c) (cputype == CPU_68060 && ((c) & FSLW_TM_SV)) 182#define WRFAULT_060(c) (cputype == CPU_68060 && ((c) & FSLW_RW_W)) 183#else 184#define KDFAULT_060(c) 0 185#define WRFAULT_060(c) 0 186#endif 187 188#ifdef M68040 189#define KDFAULT_040(c) (cputype == CPU_68040 && \ 190 ((c) & SSW4_TMMASK) == SSW4_TMKD) 191#define WRFAULT_040(c) (cputype == CPU_68040 && \ 192 ((c) & (SSW4_LK|SSW4_RW)) != SSW4_RW) 193#else 194#define KDFAULT_040(c) 0 195#define WRFAULT_040(c) 0 196#endif 197 198#if defined(M68030) || defined(M68020) 199#define KDFAULT_OTH(c) (cputype <= CPU_68030 && \ 200 ((c) & (SSW_DF|SSW_FCMASK)) == (SSW_DF|FC_SUPERD)) 201#define WRFAULT_OTH(c) (cputype <= CPU_68030 && \ 202 (((c) & SSW_DF) != 0 && \ 203 ((((c) & SSW_RW) == 0) || (((c) & SSW_RM) != 0)))) 204#else 205#define KDFAULT_OTH(c) 0 206#define WRFAULT_OTH(c) 0 207#endif 208 209#define KDFAULT(c) (KDFAULT_060(c) || KDFAULT_040(c) || KDFAULT_OTH(c)) 210#define WRFAULT(c) (WRFAULT_060(c) || WRFAULT_040(c) || WRFAULT_OTH(c)) 211 212#ifdef DEBUG 213int mmudebug = 0; 214int mmupid = -1; 215#define MDB_FOLLOW 1 216#define MDB_WBFOLLOW 2 217#define MDB_WBFAILED 4 218#define MDB_ISPID(p) ((p) == mmupid) 219#endif 220 221/* 222 * trap and syscall both need the following work done before returning 223 * to user mode. 224 */ 225static inline void 226userret(struct lwp *l, struct frame *fp, u_quad_t oticks, u_int faultaddr, 227 int fromtrap) 228{ 229 struct proc *p = l->l_proc; 230#ifdef M68040 231 int sig; 232 int beenhere = 0; 233 234again: 235#endif 236 /* Invoke MI userret code */ 237 mi_userret(l); 238 239 /* 240 * If profiling, charge system time to the trapped pc. 241 */ 242 if (p->p_stflag & PST_PROFIL) { 243 extern int psratio; 244 245 addupc_task(l, fp->f_pc, 246 (int)(p->p_sticks - oticks) * psratio); 247 } 248#ifdef M68040 249 /* 250 * Deal with user mode writebacks (from trap, or from sigreturn). 251 * If any writeback fails, go back and attempt signal delivery. 252 * unless we have already been here and attempted the writeback 253 * (e.g. bad address with user ignoring SIGSEGV). In that case 254 * we just return to the user without successfully completing 255 * the writebacks. Maybe we should just drop the sucker? 256 */ 257 if (cputype == CPU_68040 && fp->f_format == FMT7) { 258 if (beenhere) { 259#ifdef DEBUG 260 if (mmudebug & MDB_WBFAILED) 261 printf(fromtrap ? 262 "pid %d(%s): writeback aborted, pc=%x, fa=%x\n" : 263 "pid %d(%s): writeback aborted in sigreturn, pc=%x\n", 264 p->p_pid, p->p_comm, fp->f_pc, faultaddr); 265#endif 266 } else if ((sig = writeback(fp, fromtrap))) { 267 ksiginfo_t ksi; 268 beenhere = 1; 269 oticks = p->p_sticks; 270 (void)memset(&ksi, 0, sizeof(ksi)); 271 ksi.ksi_signo = sig; 272 ksi.ksi_addr = (void *)faultaddr; 273 ksi.ksi_code = BUS_OBJERR; 274 trapsignal(l, &ksi); 275 goto again; 276 } 277 } 278#endif 279} 280 281/* 282 * Used by the common m68k syscall() and child_return() functions. 283 * XXX: Temporary until all m68k ports share common trap()/userret() code. 284 */ 285void machine_userret(struct lwp *, struct frame *, u_quad_t); 286 287void 288machine_userret(struct lwp *l, struct frame *f, u_quad_t t) 289{ 290 291 userret(l, f, t, 0, 0); 292} 293 294/* 295 * Trap is called from locore to handle most types of processor traps, 296 * including events such as simulated software interrupts/AST's. 297 * System calls are broken out for efficiency. 298 */ 299/*ARGSUSED*/ 300void 301trap(struct frame *fp, int type, unsigned code, unsigned v) 302{ 303 extern char fubail[], subail[]; 304 struct lwp *l; 305 struct proc *p; 306 ksiginfo_t ksi; 307 int s; 308 u_quad_t sticks = 0 /* XXX initialiser works around compiler bug */; 309 static int panicking = 0; 310 311 uvmexp.traps++; 312 l = curlwp; 313 314 KSI_INIT_TRAP(&ksi); 315 ksi.ksi_trap = type & ~T_USER; 316 317 p = l->l_proc; 318 319#ifdef DIAGNOSTIC 320 if (l->l_addr == NULL) 321 panic("trap: no pcb"); 322#endif 323 324 if (USERMODE(fp->f_sr)) { 325 type |= T_USER; 326 sticks = p->p_sticks; 327 l->l_md.md_regs = fp->f_regs; 328 LWP_CACHE_CREDS(l, p); 329 } 330 switch (type) { 331 332 default: 333 dopanic: 334 /* 335 * Let the kernel debugger see the trap frame that 336 * caused us to panic. This is a convenience so 337 * one can see registers at the point of failure. 338 */ 339 s = splhigh(); 340 panicking = 1; 341 printf("trap type %d, code = 0x%x, v = 0x%x\n", type, code, v); 342 printf("%s program counter = 0x%x\n", 343 (type & T_USER) ? "user" : "kernel", fp->f_pc); 344#ifdef KGDB 345 /* If connected, step or cont returns 1 */ 346 if (kgdb_trap(type, (db_regs_t *)fp)) 347 goto kgdb_cont; 348#endif 349#ifdef DDB 350 (void)kdb_trap(type, (db_regs_t *)fp); 351#endif 352#ifdef KGDB 353 kgdb_cont: 354#endif 355 splx(s); 356 if (panicstr) { 357 printf("trap during panic!\n"); 358#ifdef DEBUG 359 /* XXX should be a machine-dependent hook */ 360 printf("(press a key)\n"); (void)cngetc(); 361#endif 362 } 363 regdump((struct trapframe *)fp, 128); 364 type &= ~T_USER; 365 if ((u_int)type < trap_types) 366 panic(trap_type[type]); 367 panic("trap"); 368 369 case T_BUSERR: /* kernel bus error */ 370 if (l->l_addr->u_pcb.pcb_onfault == 0) 371 goto dopanic; 372 /* FALLTHROUGH */ 373 374 copyfault: 375 /* 376 * If we have arranged to catch this fault in any of the 377 * copy to/from user space routines, set PC to return to 378 * indicated location and set flag informing buserror code 379 * that it may need to clean up stack frame. 380 */ 381 fp->f_stackadj = exframesize[fp->f_format]; 382 fp->f_format = fp->f_vector = 0; 383 fp->f_pc = (int) l->l_addr->u_pcb.pcb_onfault; 384 return; 385 386 case T_BUSERR|T_USER: /* bus error */ 387 case T_ADDRERR|T_USER: /* address error */ 388 ksi.ksi_addr = (void *)v; 389 ksi.ksi_signo = SIGBUS; 390 ksi.ksi_code = (type == (T_BUSERR|T_USER)) ? 391 BUS_OBJERR : BUS_ADRERR; 392 break; 393 394 case T_COPERR: /* kernel coprocessor violation */ 395 case T_FMTERR|T_USER: /* do all RTE errors come in as T_USER? */ 396 case T_FMTERR: /* ...just in case... */ 397 /* 398 * The user has most likely trashed the RTE or FP state info 399 * in the stack frame of a signal handler. 400 */ 401 printf("pid %d: kernel %s exception\n", p->p_pid, 402 type==T_COPERR ? "coprocessor" : "format"); 403 type |= T_USER; 404 405 mutex_enter(p->p_lock); 406 SIGACTION(p, SIGILL).sa_handler = SIG_DFL; 407 sigdelset(&p->p_sigctx.ps_sigignore, SIGILL); 408 sigdelset(&p->p_sigctx.ps_sigcatch, SIGILL); 409 sigdelset(&l->l_sigmask, SIGILL); 410 mutex_exit(p->p_lock); 411 412 ksi.ksi_signo = SIGILL; 413 ksi.ksi_addr = (void *)(int)fp->f_format; 414 /* XXX was ILL_RESAD_FAULT */ 415 ksi.ksi_code = (type == T_COPERR) ? 416 ILL_COPROC : ILL_ILLOPC; 417 break; 418 419 case T_COPERR|T_USER: /* user coprocessor violation */ 420 /* What is a proper response here? */ 421 ksi.ksi_signo = SIGFPE; 422 ksi.ksi_code = FPE_FLTINV; 423 break; 424 425 case T_FPERR|T_USER: /* 68881 exceptions */ 426 /* 427 * We pass along the 68881 status register which locore stashed 428 * in code for us. 429 */ 430 ksi.ksi_signo = SIGFPE; 431 ksi.ksi_code = fpsr2siginfocode(code); 432 break; 433 434#ifdef M68040 435 case T_FPEMULI|T_USER: /* unimplemented FP instruction */ 436 case T_FPEMULD|T_USER: /* unimplemented FP data type */ 437 /* XXX need to FSAVE */ 438 printf("pid %d(%s): unimplemented FP %s at %x (EA %x)\n", 439 p->p_pid, p->p_comm, 440 fp->f_format == 2 ? "instruction" : "data type", 441 fp->f_pc, fp->f_fmt2.f_iaddr); 442 /* XXX need to FRESTORE */ 443 ksi.ksi_signo = SIGFPE; 444 ksi.ksi_code = FPE_FLTINV; 445 break; 446#endif 447 448 case T_ILLINST|T_USER: /* illegal instruction fault */ 449 case T_PRIVINST|T_USER: /* privileged instruction fault */ 450 ksi.ksi_addr = (void *)(int)fp->f_format; 451 /* XXX was ILL_PRIVIN_FAULT */ 452 ksi.ksi_signo = SIGILL; 453 ksi.ksi_code = (type == (T_PRIVINST|T_USER)) ? 454 ILL_PRVOPC : ILL_ILLOPC; 455 break; 456 457 case T_ZERODIV|T_USER: /* Divide by zero */ 458 ksi.ksi_addr = (void *)(int)fp->f_format; 459 /* XXX was FPE_INTDIV_TRAP */ 460 ksi.ksi_signo = SIGFPE; 461 ksi.ksi_code = FPE_FLTDIV; 462 break; 463 464 case T_CHKINST|T_USER: /* CHK instruction trap */ 465 ksi.ksi_addr = (void *)(int)fp->f_format; 466 /* XXX was FPE_SUBRNG_TRAP */ 467 ksi.ksi_signo = SIGFPE; 468 break; 469 470 case T_TRAPVINST|T_USER: /* TRAPV instruction trap */ 471 ksi.ksi_addr = (void *)(int)fp->f_format; 472 /* XXX was FPE_INTOVF_TRAP */ 473 ksi.ksi_signo = SIGFPE; 474 break; 475 476 /* 477 * XXX: Trace traps are a nightmare. 478 * 479 * HP-UX uses trap #1 for breakpoints, 480 * NetBSD/m68k uses trap #2, 481 * SUN 3.x uses trap #15, 482 * DDB and KGDB uses trap #15 (for kernel breakpoints; 483 * handled elsewhere). 484 * 485 * NetBSD and HP-UX traps both get mapped by locore.s into T_TRACE. 486 * SUN 3.x traps get passed through as T_TRAP15 and are not really 487 * supported yet. 488 * 489 * XXX: We should never get kernel-mode T_TRAP15 490 * XXX: because locore.s now gives them special treatment. 491 */ 492 case T_TRAP15: /* kernel breakpoint */ 493#ifdef DEBUG 494 printf("unexpected kernel trace trap, type = %d\n", type); 495 printf("program counter = 0x%x\n", fp->f_pc); 496#endif 497 fp->f_sr &= ~PSL_T; 498 return; 499 500 case T_TRACE|T_USER: /* user trace trap */ 501#ifdef COMPAT_SUNOS 502 /* 503 * SunOS uses Trap #2 for a "CPU cache flush". 504 * Just flush the on-chip caches and return. 505 */ 506 if (p->p_emul == &emul_sunos) { 507 ICIA(); 508 DCIU(); 509 return; 510 } 511#endif 512 /* FALLTHROUGH */ 513 case T_TRACE: /* tracing a trap instruction */ 514 case T_TRAP15|T_USER: /* SUN user trace trap */ 515 fp->f_sr &= ~PSL_T; 516 ksi.ksi_signo = SIGTRAP; 517 break; 518 519 case T_ASTFLT: /* system async trap, cannot happen */ 520 goto dopanic; 521 522 case T_ASTFLT|T_USER: /* user async trap */ 523 astpending = 0; 524 /* 525 * We check for software interrupts first. This is because 526 * they are at a higher level than ASTs, and on a VAX would 527 * interrupt the AST. We assume that if we are processing 528 * an AST that we must be at IPL0 so we don't bother to 529 * check. Note that we ensure that we are at least at SIR 530 * IPL while processing the SIR. 531 */ 532 spl1(); 533 /* fall into... */ 534 535 case T_SSIR: /* software interrupt */ 536 case T_SSIR|T_USER: 537 /* 538 * If this was not an AST trap, we are all done. 539 */ 540 if (type != (T_ASTFLT|T_USER)) { 541 uvmexp.traps--; 542 return; 543 } 544 spl0(); 545 if (l->l_pflag & LP_OWEUPC) { 546 l->l_pflag &= ~LP_OWEUPC; 547 ADDUPROF(l); 548 } 549 if (curcpu()->ci_want_resched) 550 preempt(); 551 goto out; 552 553 case T_MMUFLT: /* kernel mode page fault */ 554 /* 555 * If we were doing profiling ticks or other user mode 556 * stuff from interrupt code, Just Say No. 557 */ 558 if (l->l_addr->u_pcb.pcb_onfault == fubail || 559 l->l_addr->u_pcb.pcb_onfault == subail) 560 goto copyfault; 561 /* fall into ... */ 562 563 case T_MMUFLT|T_USER: /* page fault */ 564 { 565 vaddr_t va; 566 struct vmspace *vm = p->p_vmspace; 567 struct vm_map *map; 568 int rv; 569 vm_prot_t ftype; 570 extern struct vm_map *kernel_map; 571 572#ifdef DEBUG 573 if ((mmudebug & MDB_WBFOLLOW) || MDB_ISPID(p->p_pid)) 574 printf("trap: T_MMUFLT pid=%d, code=%x, v=%x, pc=%x, sr=%x\n", 575 p->p_pid, code, v, fp->f_pc, fp->f_sr); 576#endif 577 /* 578 * It is only a kernel address space fault iff: 579 * 1. (type & T_USER) == 0 and 580 * 2. pcb_onfault not set or 581 * 3. pcb_onfault set but supervisor space data fault 582 * The last can occur during an exec() copyin where the 583 * argument space is lazy-allocated. 584 */ 585 if ((type & T_USER) == 0 && 586 ((l->l_addr->u_pcb.pcb_onfault == 0) || KDFAULT(code))) 587 map = kernel_map; 588 else { 589 map = vm ? &vm->vm_map : kernel_map; 590 if ((l->l_flag & LW_SA) 591 && (~l->l_pflag & LP_SA_NOBLOCK)) { 592 l->l_savp->savp_faultaddr = (vaddr_t)v; 593 l->l_pflag |= LP_SA_PAGEFAULT; 594 } 595 } 596 597 if (WRFAULT(code)) 598 ftype = VM_PROT_WRITE; 599 else 600 ftype = VM_PROT_READ; 601 602 va = trunc_page((vaddr_t)v); 603 604 if (map == kernel_map && va == 0) { 605 printf("trap: bad kernel %s access at 0x%x\n", 606 (ftype & VM_PROT_WRITE) ? "read/write" : 607 "read", v); 608 goto dopanic; 609 } 610 611#ifdef DIAGNOSTIC 612 if (interrupt_depth && !panicking) { 613 printf("trap: calling uvm_fault() from interrupt!\n"); 614 goto dopanic; 615 } 616#endif 617 618 rv = uvm_fault(map, va, ftype); 619#ifdef DEBUG 620 if (rv && MDB_ISPID(p->p_pid)) 621 printf("uvm_fault(%p, 0x%lx, 0x%x) -> 0x%x\n", 622 map, va, ftype, rv); 623#endif 624 /* 625 * If this was a stack access we keep track of the maximum 626 * accessed stack size. Also, if vm_fault gets a protection 627 * failure it is due to accessing the stack region outside 628 * the current limit and we need to reflect that as an access 629 * error. 630 */ 631 if (rv == 0) { 632 if (map != kernel_map && (void *)va >= vm->vm_maxsaddr) 633 uvm_grow(p, va); 634 635 if (type == T_MMUFLT) { 636#ifdef M68040 637 if (cputype == CPU_68040) 638 (void) writeback(fp, 1); 639#endif 640 return; 641 } 642 l->l_pflag &= ~LP_SA_PAGEFAULT; 643 goto out; 644 } 645 if (rv == EACCES) { 646 ksi.ksi_code = SEGV_ACCERR; 647 rv = EFAULT; 648 } else 649 ksi.ksi_code = SEGV_MAPERR; 650 if (type == T_MMUFLT) { 651 if (l->l_addr->u_pcb.pcb_onfault) 652 goto copyfault; 653 printf("uvm_fault(%p, 0x%lx, 0x%x) -> 0x%x\n", 654 map, va, ftype, rv); 655 printf(" type %x, code [mmu,,ssw]: %x\n", 656 type, code); 657 goto dopanic; 658 } 659 l->l_pflag &= ~LP_SA_PAGEFAULT; 660 ksi.ksi_addr = (void *)v; 661 if (rv == ENOMEM) { 662 printf("UVM: pid %d (%s), uid %d killed: out of swap\n", 663 p->p_pid, p->p_comm, 664 l->l_cred ? 665 kauth_cred_geteuid(l->l_cred) : -1); 666 ksi.ksi_signo = SIGKILL; 667 } else { 668 ksi.ksi_signo = SIGSEGV; 669 } 670 break; 671 } 672 } 673 trapsignal(l, &ksi); 674 if ((type & T_USER) == 0) 675 return; 676out: 677 userret(l, fp, sticks, v, 1); 678} 679 680#ifdef M68040 681#ifdef DEBUG 682struct writebackstats { 683 int calls; 684 int cpushes; 685 int move16s; 686 int wb1s, wb2s, wb3s; 687 int wbsize[4]; 688} wbstats; 689 690const char *f7sz[] = { "longword", "byte", "word", "line" }; 691const char *f7tt[] = { "normal", "MOVE16", "AFC", "ACK" }; 692const char *f7tm[] = { "d-push", "u-data", "u-code", "M-data", 693 "M-code", "k-data", "k-code", "RES" }; 694const char wberrstr[] = 695 "WARNING: pid %d(%s) writeback [%s] failed, pc=%x fa=%x wba=%x wbd=%x\n"; 696#endif 697 698int 699writeback(struct frame *fp, int docachepush) 700{ 701 struct fmt7 *f = &fp->f_fmt7; 702 struct lwp *l = curlwp; 703 struct proc *p = l->l_proc; 704 int err = 0; 705 u_int fa; 706 void *oonfault = l->l_addr->u_pcb.pcb_onfault; 707 paddr_t pa; 708 709#ifdef DEBUG 710 if ((mmudebug & MDB_WBFOLLOW) || MDB_ISPID(p->p_pid)) { 711 printf(" pid=%d, fa=%x,", p->p_pid, f->f_fa); 712 dumpssw(f->f_ssw); 713 } 714 wbstats.calls++; 715#endif 716 /* 717 * Deal with special cases first. 718 */ 719 if ((f->f_ssw & SSW4_TMMASK) == SSW4_TMDCP) { 720 /* 721 * Dcache push fault. 722 * Line-align the address and write out the push data to 723 * the indicated physical address. 724 */ 725#ifdef DEBUG 726 if ((mmudebug & MDB_WBFOLLOW) || MDB_ISPID(p->p_pid)) { 727 printf(" pushing %s to PA %x, data %x", 728 f7sz[(f->f_ssw & SSW4_SZMASK) >> 5], 729 f->f_fa, f->f_pd0); 730 if ((f->f_ssw & SSW4_SZMASK) == SSW4_SZLN) 731 printf("/%x/%x/%x", 732 f->f_pd1, f->f_pd2, f->f_pd3); 733 printf("\n"); 734 } 735 if (f->f_wb1s & SSW4_WBSV) 736 panic("writeback: cache push with WB1S valid"); 737 wbstats.cpushes++; 738#endif 739 /* 740 * XXX there are security problems if we attempt to do a 741 * cache push after a signal handler has been called. 742 */ 743 if (docachepush) { 744 pmap_enter(pmap_kernel(), (vaddr_t)vmmap, 745 trunc_page(f->f_fa), VM_PROT_WRITE, 746 VM_PROT_WRITE|PMAP_WIRED); 747 pmap_update(pmap_kernel()); 748 fa = (u_int)&vmmap[(f->f_fa & PGOFSET) & ~0xF]; 749 memcpy((void *)fa, (void *)&f->f_pd0, 16); 750 (void) pmap_extract(pmap_kernel(), (vaddr_t)fa, &pa); 751 DCFL(pa); 752 pmap_remove(pmap_kernel(), (vaddr_t)vmmap, 753 (vaddr_t)&vmmap[PAGE_SIZE]); 754 pmap_update(pmap_kernel()); 755 } else 756 printf("WARNING: pid %d(%s) uid %d: CPUSH not done\n", 757 p->p_pid, p->p_comm, kauth_cred_geteuid(l->l_cred)); 758 } else if ((f->f_ssw & (SSW4_RW|SSW4_TTMASK)) == SSW4_TTM16) { 759 /* 760 * MOVE16 fault. 761 * Line-align the address and write out the push data to 762 * the indicated virtual address. 763 */ 764#ifdef DEBUG 765 if ((mmudebug & MDB_WBFOLLOW) || MDB_ISPID(p->p_pid)) 766 printf(" MOVE16 to VA %x(%x), data %x/%x/%x/%x\n", 767 f->f_fa, f->f_fa & ~0xF, f->f_pd0, f->f_pd1, 768 f->f_pd2, f->f_pd3); 769 if (f->f_wb1s & SSW4_WBSV) 770 panic("writeback: MOVE16 with WB1S valid"); 771 wbstats.move16s++; 772#endif 773 if (KDFAULT(f->f_wb1s)) 774 memcpy((void *)(f->f_fa & ~0xF), (void *)&f->f_pd0, 16); 775 else 776 err = suline((void *)(f->f_fa & ~0xF), (void *)&f->f_pd0); 777 if (err) { 778 fa = f->f_fa & ~0xF; 779#ifdef DEBUG 780 if (mmudebug & MDB_WBFAILED) 781 printf(wberrstr, p->p_pid, p->p_comm, 782 "MOVE16", fp->f_pc, f->f_fa, 783 f->f_fa & ~0xF, f->f_pd0); 784#endif 785 } 786 } else if (f->f_wb1s & SSW4_WBSV) { 787 /* 788 * Writeback #1. 789 * Position the "memory-aligned" data and write it out. 790 */ 791 u_int wb1d = f->f_wb1d; 792 int off; 793 794#ifdef DEBUG 795 if ((mmudebug & MDB_WBFOLLOW) || MDB_ISPID(p->p_pid)) 796 dumpwb(1, f->f_wb1s, f->f_wb1a, f->f_wb1d); 797 wbstats.wb1s++; 798 wbstats.wbsize[(f->f_wb2s&SSW4_SZMASK)>>5]++; 799#endif 800 off = (f->f_wb1a & 3) * 8; 801 switch (f->f_wb1s & SSW4_SZMASK) { 802 case SSW4_SZLW: 803 if (off) 804 wb1d = (wb1d >> (32 - off)) | (wb1d << off); 805 if (KDFAULT(f->f_wb1s)) 806 *(long *)f->f_wb1a = wb1d; 807 else 808 err = suword((void *)f->f_wb1a, wb1d); 809 break; 810 case SSW4_SZB: 811 off = 24 - off; 812 if (off) 813 wb1d >>= off; 814 if (KDFAULT(f->f_wb1s)) 815 *(char *)f->f_wb1a = wb1d; 816 else 817 err = subyte((void *)f->f_wb1a, wb1d); 818 break; 819 case SSW4_SZW: 820 off = (off + 16) % 32; 821 if (off) 822 wb1d = (wb1d >> (32 - off)) | (wb1d << off); 823 if (KDFAULT(f->f_wb1s)) 824 *(short *)f->f_wb1a = wb1d; 825 else 826 err = susword((void *)f->f_wb1a, wb1d); 827 break; 828 } 829 if (err) { 830 fa = f->f_wb1a; 831#ifdef DEBUG 832 if (mmudebug & MDB_WBFAILED) 833 printf(wberrstr, p->p_pid, p->p_comm, 834 "#1", fp->f_pc, f->f_fa, 835 f->f_wb1a, f->f_wb1d); 836#endif 837 } 838 } 839 /* 840 * Deal with the "normal" writebacks. 841 * 842 * XXX writeback2 is known to reflect a LINE size writeback after 843 * a MOVE16 was already dealt with above. Ignore it. 844 */ 845 if (err == 0 && (f->f_wb2s & SSW4_WBSV) && 846 (f->f_wb2s & SSW4_SZMASK) != SSW4_SZLN) { 847#ifdef DEBUG 848 if ((mmudebug & MDB_WBFOLLOW) || MDB_ISPID(p->p_pid)) 849 dumpwb(2, f->f_wb2s, f->f_wb2a, f->f_wb2d); 850 wbstats.wb2s++; 851 wbstats.wbsize[(f->f_wb2s&SSW4_SZMASK)>>5]++; 852#endif 853 switch (f->f_wb2s & SSW4_SZMASK) { 854 case SSW4_SZLW: 855 if (KDFAULT(f->f_wb2s)) 856 *(long *)f->f_wb2a = f->f_wb2d; 857 else 858 err = suword((void *)f->f_wb2a, f->f_wb2d); 859 break; 860 case SSW4_SZB: 861 if (KDFAULT(f->f_wb2s)) 862 *(char *)f->f_wb2a = f->f_wb2d; 863 else 864 err = subyte((void *)f->f_wb2a, f->f_wb2d); 865 break; 866 case SSW4_SZW: 867 if (KDFAULT(f->f_wb2s)) 868 *(short *)f->f_wb2a = f->f_wb2d; 869 else 870 err = susword((void *)f->f_wb2a, f->f_wb2d); 871 break; 872 } 873 if (err) { 874 fa = f->f_wb2a; 875#ifdef DEBUG 876 if (mmudebug & MDB_WBFAILED) { 877 printf(wberrstr, p->p_pid, p->p_comm, 878 "#2", fp->f_pc, f->f_fa, 879 f->f_wb2a, f->f_wb2d); 880 dumpssw(f->f_ssw); 881 dumpwb(2, f->f_wb2s, f->f_wb2a, f->f_wb2d); 882 } 883#endif 884 } 885 } 886 if (err == 0 && (f->f_wb3s & SSW4_WBSV)) { 887#ifdef DEBUG 888 if ((mmudebug & MDB_WBFOLLOW) || MDB_ISPID(p->p_pid)) 889 dumpwb(3, f->f_wb3s, f->f_wb3a, f->f_wb3d); 890 wbstats.wb3s++; 891 wbstats.wbsize[(f->f_wb3s&SSW4_SZMASK)>>5]++; 892#endif 893 switch (f->f_wb3s & SSW4_SZMASK) { 894 case SSW4_SZLW: 895 if (KDFAULT(f->f_wb3s)) 896 *(long *)f->f_wb3a = f->f_wb3d; 897 else 898 err = suword((void *)f->f_wb3a, f->f_wb3d); 899 break; 900 case SSW4_SZB: 901 if (KDFAULT(f->f_wb3s)) 902 *(char *)f->f_wb3a = f->f_wb3d; 903 else 904 err = subyte((void *)f->f_wb3a, f->f_wb3d); 905 break; 906 case SSW4_SZW: 907 if (KDFAULT(f->f_wb3s)) 908 *(short *)f->f_wb3a = f->f_wb3d; 909 else 910 err = susword((void *)f->f_wb3a, f->f_wb3d); 911 break; 912#ifdef DEBUG 913 case SSW4_SZLN: 914 panic("writeback: wb3s indicates LINE write"); 915#endif 916 } 917 if (err) { 918 fa = f->f_wb3a; 919#ifdef DEBUG 920 if (mmudebug & MDB_WBFAILED) 921 printf(wberrstr, p->p_pid, p->p_comm, 922 "#3", fp->f_pc, f->f_fa, 923 f->f_wb3a, f->f_wb3d); 924#endif 925 } 926 } 927 l->l_addr->u_pcb.pcb_onfault = oonfault; 928 if (err) 929 err = SIGSEGV; 930 return (err); 931} 932 933#ifdef DEBUG 934void 935dumpssw(u_short ssw) 936{ 937 printf(" SSW: %x: ", ssw); 938 if (ssw & SSW4_CP) 939 printf("CP,"); 940 if (ssw & SSW4_CU) 941 printf("CU,"); 942 if (ssw & SSW4_CT) 943 printf("CT,"); 944 if (ssw & SSW4_CM) 945 printf("CM,"); 946 if (ssw & SSW4_MA) 947 printf("MA,"); 948 if (ssw & SSW4_ATC) 949 printf("ATC,"); 950 if (ssw & SSW4_LK) 951 printf("LK,"); 952 if (ssw & SSW4_RW) 953 printf("RW,"); 954 printf(" SZ=%s, TT=%s, TM=%s\n", 955 f7sz[(ssw & SSW4_SZMASK) >> 5], 956 f7tt[(ssw & SSW4_TTMASK) >> 3], 957 f7tm[ssw & SSW4_TMMASK]); 958} 959 960void 961dumpwb(int num, u_short s, u_int a, u_int d) 962{ 963 struct proc *p = curproc; 964 paddr_t pa; 965 966 printf(" writeback #%d: VA %x, data %x, SZ=%s, TT=%s, TM=%s\n", 967 num, a, d, f7sz[(s & SSW4_SZMASK) >> 5], 968 f7tt[(s & SSW4_TTMASK) >> 3], f7tm[s & SSW4_TMMASK]); 969 printf(" PA "); 970 if (pmap_extract(p->p_vmspace->vm_map.pmap, (vaddr_t)a, &pa) == false) 971 printf("<invalid address>"); 972 else 973 printf("%lx, current value %lx", pa, fuword((void *)a)); 974 printf("\n"); 975} 976#endif 977#endif 978