1 /* 2 * Copyright (c) 1988 University of Utah. 3 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * the Systems Programming Group of the University of Utah Computer 8 * Science Department. 9 * 10 * %sccs.include.redist.c% 11 * 12 * from: Utah $Hdr: trap.c 1.35 91/12/26$ 13 * 14 * @(#)trap.c 7.25 (Berkeley) 10/11/92 15 */ 16 17 #include <sys/param.h> 18 #include <sys/systm.h> 19 #include <sys/proc.h> 20 #include <sys/acct.h> 21 #include <sys/kernel.h> 22 #include <sys/signalvar.h> 23 #include <sys/resourcevar.h> 24 #include <sys/syscall.h> 25 #include <sys/syslog.h> 26 #include <sys/user.h> 27 #ifdef KTRACE 28 #include <sys/ktrace.h> 29 #endif 30 31 #include <machine/psl.h> 32 #include <machine/trap.h> 33 #include <machine/cpu.h> 34 #include <machine/reg.h> 35 #include <machine/mtpr.h> 36 37 #include <vm/vm.h> 38 #include <vm/pmap.h> 39 40 #ifdef HPUXCOMPAT 41 #include <hp/hpux/hpux.h> 42 #endif 43 44 struct sysent sysent[]; 45 int nsysent; 46 47 char *trap_type[] = { 48 "Bus error", 49 "Address error", 50 "Illegal instruction", 51 "Zero divide", 52 "CHK instruction", 53 "TRAPV instruction", 54 "Privilege violation", 55 "Trace trap", 56 "MMU fault", 57 "SSIR trap", 58 "Format error", 59 "68881 exception", 60 "Coprocessor violation", 61 "Async system trap" 62 }; 63 #define TRAP_TYPES (sizeof trap_type / sizeof trap_type[0]) 64 65 /* 66 * Size of various exception stack frames (minus the standard 8 bytes) 67 */ 68 short exframesize[] = { 69 FMT0SIZE, /* type 0 - normal (68020/030/040) */ 70 FMT1SIZE, /* type 1 - throwaway (68020/030/040) */ 71 FMT2SIZE, /* type 2 - normal 6-word (68020/030/040) */ 72 FMT3SIZE, /* type 3 - FP post-instruction (68040) */ 73 -1, -1, -1, /* type 4-6 - undefined */ 74 FMT7SIZE, /* type 7 - access error (68040) */ 75 58, /* type 8 - bus fault (68010) */ 76 FMT9SIZE, /* type 9 - coprocessor mid-instruction (68020/030) */ 77 FMTASIZE, /* type A - short bus fault (68020/030) */ 78 FMTBSIZE, /* type B - long bus fault (68020/030) */ 79 -1, -1, -1, -1 /* type C-F - undefined */ 80 }; 81 82 #ifdef HP380 83 #define KDFAULT(c) (mmutype == MMU_68040 ? \ 84 ((c) & SSW4_TMMASK) == SSW4_TMKD : \ 85 ((c) & (SSW_DF|FC_SUPERD)) == (SSW_DF|FC_SUPERD)) 86 #define WRFAULT(c) (mmutype == MMU_68040 ? \ 87 ((c) & SSW4_RW) == 0 : \ 88 ((c) & (SSW_DF|SSW_RW)) == SSW_DF) 89 #else 90 #define KDFAULT(c) (((c) & (SSW_DF|SSW_FCMASK)) == (SSW_DF|FC_SUPERD)) 91 #define WRFAULT(c) (((c) & (SSW_DF|SSW_RW)) == SSW_DF) 92 #endif 93 94 #ifdef DEBUG 95 int mmudebug = 0; 96 int mmupid = -1; 97 #define MDB_FOLLOW 1 98 #define MDB_WBFOLLOW 2 99 #define MDB_WBFAILED 4 100 #define MDB_ISPID(p) (p) == mmupid 101 #endif 102 103 /* 104 * trap and syscall both need the following work done before returning 105 * to user mode. 106 */ 107 static inline void 108 userret(p, fp, oticks, faultaddr, fromtrap) 109 register struct proc *p; 110 register struct frame *fp; 111 u_quad_t oticks; 112 u_int faultaddr; 113 int fromtrap; 114 { 115 int sig, s; 116 #ifdef HP380 117 int beenhere = 0; 118 119 again: 120 #endif 121 /* take pending signals */ 122 while ((sig = CURSIG(p)) != 0) 123 psig(sig); 124 p->p_pri = p->p_usrpri; 125 if (want_resched) { 126 /* 127 * Since we are curproc, clock will normally just change 128 * our priority without moving us from one queue to another 129 * (since the running process is not on a queue.) 130 * If that happened after we setrq ourselves but before we 131 * swtch()'ed, we might not be on the queue indicated by 132 * our priority. 133 */ 134 s = splstatclock(); 135 setrq(p); 136 p->p_stats->p_ru.ru_nivcsw++; 137 swtch(); 138 splx(s); 139 while ((sig = CURSIG(p)) != 0) 140 psig(sig); 141 } 142 143 /* 144 * If profiling, charge system time to the trapped pc. 145 */ 146 if (p->p_flag & SPROFIL) { 147 extern int psratio; 148 149 addupc_task(p, fp->f_pc, 150 (int)(p->p_sticks - oticks) * psratio); 151 } 152 #ifdef HP380 153 /* 154 * Deal with user mode writebacks (from trap, or from sigreturn). 155 * If any writeback fails, go back and attempt signal delivery. 156 * unless we have already been here and attempted the writeback 157 * (e.g. bad address with user ignoring SIGSEGV). In that case 158 * we just return to the user without sucessfully completing 159 * the writebacks. Maybe we should just drop the sucker? 160 */ 161 if (mmutype == MMU_68040 && fp->f_format == FMT7) { 162 if (beenhere) { 163 #ifdef DEBUG 164 if (mmudebug & MDB_WBFAILED) 165 printf(fromtrap ? 166 "pid %d(%s): writeback aborted, pc=%x, fa=%x\n" : 167 "pid %d(%s): writeback aborted in sigreturn, pc=%x\n", 168 p->p_pid, p->p_comm, fp->f_pc, faultaddr); 169 #endif 170 } else if (sig = writeback(fp, fromtrap)) { 171 beenhere = 1; 172 oticks = p->p_sticks; 173 trapsignal(p, sig, faultaddr); 174 goto again; 175 } 176 } 177 #endif 178 curpri = p->p_pri; 179 } 180 181 /* 182 * Trap is called from locore to handle most types of processor traps, 183 * including events such as simulated software interrupts/AST's. 184 * System calls are broken out for efficiency. 185 */ 186 /*ARGSUSED*/ 187 trap(type, code, v, frame) 188 int type; 189 unsigned code; 190 register unsigned v; 191 struct frame frame; 192 { 193 register int i; 194 unsigned ucode; 195 register struct proc *p; 196 u_quad_t sticks; 197 unsigned ncode; 198 extern char fswintr[]; 199 200 cnt.v_trap++; 201 p = curproc; 202 ucode = 0; 203 if (USERMODE(frame.f_sr)) { 204 type |= T_USER; 205 sticks = p->p_sticks; 206 p->p_md.md_regs = frame.f_regs; 207 } 208 switch (type) { 209 210 default: 211 dopanic: 212 printf("trap type %d, code = %x, v = %x\n", type, code, v); 213 regdump(frame.f_regs, 128); 214 type &= ~T_USER; 215 if ((unsigned)type < TRAP_TYPES) 216 panic(trap_type[type]); 217 panic("trap"); 218 219 case T_BUSERR: /* kernel bus error */ 220 if (!p->p_addr->u_pcb.pcb_onfault) 221 goto dopanic; 222 /* 223 * If we have arranged to catch this fault in any of the 224 * copy to/from user space routines, set PC to return to 225 * indicated location and set flag informing buserror code 226 * that it may need to clean up stack frame. 227 */ 228 copyfault: 229 frame.f_stackadj = exframesize[frame.f_format]; 230 frame.f_format = frame.f_vector = 0; 231 frame.f_pc = (int) p->p_addr->u_pcb.pcb_onfault; 232 return; 233 234 case T_BUSERR|T_USER: /* bus error */ 235 case T_ADDRERR|T_USER: /* address error */ 236 ucode = v; 237 i = SIGBUS; 238 break; 239 240 #ifdef FPCOPROC 241 case T_COPERR: /* kernel coprocessor violation */ 242 #endif 243 case T_FMTERR|T_USER: /* do all RTE errors come in as T_USER? */ 244 case T_FMTERR: /* ...just in case... */ 245 /* 246 * The user has most likely trashed the RTE or FP state info 247 * in the stack frame of a signal handler. 248 */ 249 type |= T_USER; 250 printf("pid %d: kernel %s exception\n", p->p_pid, 251 type==T_COPERR ? "coprocessor" : "format"); 252 p->p_sigacts->ps_sigact[SIGILL] = SIG_DFL; 253 i = sigmask(SIGILL); 254 p->p_sigignore &= ~i; 255 p->p_sigcatch &= ~i; 256 p->p_sigmask &= ~i; 257 i = SIGILL; 258 ucode = frame.f_format; /* XXX was ILL_RESAD_FAULT */ 259 break; 260 261 #ifdef FPCOPROC 262 case T_COPERR|T_USER: /* user coprocessor violation */ 263 /* What is a proper response here? */ 264 ucode = 0; 265 i = SIGFPE; 266 break; 267 268 case T_FPERR|T_USER: /* 68881 exceptions */ 269 /* 270 * We pass along the 68881 status register which locore stashed 271 * in code for us. Note that there is a possibility that the 272 * bit pattern of this register will conflict with one of the 273 * FPE_* codes defined in signal.h. Fortunately for us, the 274 * only such codes we use are all in the range 1-7 and the low 275 * 3 bits of the status register are defined as 0 so there is 276 * no clash. 277 */ 278 ucode = code; 279 i = SIGFPE; 280 break; 281 #endif 282 283 #ifdef HP380 284 case T_FPEMULI|T_USER: /* unimplemented FP instuction */ 285 case T_FPEMULD|T_USER: /* unimplemented FP data type */ 286 /* XXX need to FSAVE */ 287 printf("pid %d(%s): unimplemented FP %s at %x (EA %x)\n", 288 p->p_pid, p->p_comm, 289 frame.f_format == 2 ? "instruction" : "data type", 290 frame.f_pc, frame.f_fmt2.f_iaddr); 291 /* XXX need to FRESTORE */ 292 i = SIGFPE; 293 break; 294 #endif 295 296 case T_ILLINST|T_USER: /* illegal instruction fault */ 297 #ifdef HPUXCOMPAT 298 if (p->p_flag & SHPUX) { 299 ucode = HPUX_ILL_ILLINST_TRAP; 300 i = SIGILL; 301 break; 302 } 303 /* fall through */ 304 #endif 305 case T_PRIVINST|T_USER: /* privileged instruction fault */ 306 #ifdef HPUXCOMPAT 307 if (p->p_flag & SHPUX) 308 ucode = HPUX_ILL_PRIV_TRAP; 309 else 310 #endif 311 ucode = frame.f_format; /* XXX was ILL_PRIVIN_FAULT */ 312 i = SIGILL; 313 break; 314 315 case T_ZERODIV|T_USER: /* Divide by zero */ 316 #ifdef HPUXCOMPAT 317 if (p->p_flag & SHPUX) 318 ucode = HPUX_FPE_INTDIV_TRAP; 319 else 320 #endif 321 ucode = frame.f_format; /* XXX was FPE_INTDIV_TRAP */ 322 i = SIGFPE; 323 break; 324 325 case T_CHKINST|T_USER: /* CHK instruction trap */ 326 #ifdef HPUXCOMPAT 327 if (p->p_flag & SHPUX) { 328 /* handled differently under hp-ux */ 329 i = SIGILL; 330 ucode = HPUX_ILL_CHK_TRAP; 331 break; 332 } 333 #endif 334 ucode = frame.f_format; /* XXX was FPE_SUBRNG_TRAP */ 335 i = SIGFPE; 336 break; 337 338 case T_TRAPVINST|T_USER: /* TRAPV instruction trap */ 339 #ifdef HPUXCOMPAT 340 if (p->p_flag & SHPUX) { 341 /* handled differently under hp-ux */ 342 i = SIGILL; 343 ucode = HPUX_ILL_TRAPV_TRAP; 344 break; 345 } 346 #endif 347 ucode = frame.f_format; /* XXX was FPE_INTOVF_TRAP */ 348 i = SIGFPE; 349 break; 350 351 /* 352 * XXX: Trace traps are a nightmare. 353 * 354 * HP-UX uses trap #1 for breakpoints, 355 * HPBSD uses trap #2, 356 * SUN 3.x uses trap #15, 357 * KGDB uses trap #15 (for kernel breakpoints; handled elsewhere). 358 * 359 * HPBSD and HP-UX traps both get mapped by locore.s into T_TRACE. 360 * SUN 3.x traps get passed through as T_TRAP15 and are not really 361 * supported yet. 362 */ 363 case T_TRACE: /* kernel trace trap */ 364 case T_TRAP15: /* SUN trace trap */ 365 frame.f_sr &= ~PSL_T; 366 i = SIGTRAP; 367 break; 368 369 case T_TRACE|T_USER: /* user trace trap */ 370 case T_TRAP15|T_USER: /* SUN user trace trap */ 371 frame.f_sr &= ~PSL_T; 372 i = SIGTRAP; 373 break; 374 375 case T_ASTFLT: /* system async trap, cannot happen */ 376 goto dopanic; 377 378 case T_ASTFLT|T_USER: /* user async trap */ 379 astpending = 0; 380 /* 381 * We check for software interrupts first. This is because 382 * they are at a higher level than ASTs, and on a VAX would 383 * interrupt the AST. We assume that if we are processing 384 * an AST that we must be at IPL0 so we don't bother to 385 * check. Note that we ensure that we are at least at SIR 386 * IPL while processing the SIR. 387 */ 388 spl1(); 389 /* fall into... */ 390 391 case T_SSIR: /* software interrupt */ 392 case T_SSIR|T_USER: 393 if (ssir & SIR_NET) { 394 siroff(SIR_NET); 395 cnt.v_soft++; 396 netintr(); 397 } 398 if (ssir & SIR_CLOCK) { 399 siroff(SIR_CLOCK); 400 cnt.v_soft++; 401 softclock(); 402 } 403 /* 404 * If this was not an AST trap, we are all done. 405 */ 406 if (type != (T_ASTFLT|T_USER)) { 407 cnt.v_trap--; 408 return; 409 } 410 spl0(); 411 if (p->p_flag & SOWEUPC) { 412 p->p_flag &= ~SOWEUPC; 413 ADDUPROF(p); 414 } 415 goto out; 416 417 case T_MMUFLT: /* kernel mode page fault */ 418 /* 419 * If we were doing profiling ticks or other user mode 420 * stuff from interrupt code, Just Say No. 421 */ 422 if (p->p_addr->u_pcb.pcb_onfault == fswintr) 423 goto copyfault; 424 /* fall into ... */ 425 426 case T_MMUFLT|T_USER: /* page fault */ 427 { 428 register vm_offset_t va; 429 register struct vmspace *vm = p->p_vmspace; 430 register vm_map_t map; 431 int rv; 432 vm_prot_t ftype; 433 extern vm_map_t kernel_map; 434 435 #ifdef DEBUG 436 if ((mmudebug & MDB_WBFOLLOW) || MDB_ISPID(p->p_pid)) 437 printf("trap: T_MMUFLT pid=%d, code=%x, v=%x, pc=%x, sr=%x\n", 438 p->p_pid, code, v, frame.f_pc, frame.f_sr); 439 #endif 440 /* 441 * It is only a kernel address space fault iff: 442 * 1. (type & T_USER) == 0 and 443 * 2. pcb_onfault not set or 444 * 3. pcb_onfault set but supervisor space data fault 445 * The last can occur during an exec() copyin where the 446 * argument space is lazy-allocated. 447 */ 448 if (type == T_MMUFLT && 449 (!p->p_addr->u_pcb.pcb_onfault || KDFAULT(code))) 450 map = kernel_map; 451 else 452 map = &vm->vm_map; 453 if (WRFAULT(code)) 454 ftype = VM_PROT_READ | VM_PROT_WRITE; 455 else 456 ftype = VM_PROT_READ; 457 va = trunc_page((vm_offset_t)v); 458 #ifdef DEBUG 459 if (map == kernel_map && va == 0) { 460 printf("trap: bad kernel access at %x\n", v); 461 goto dopanic; 462 } 463 #endif 464 rv = vm_fault(map, va, ftype, FALSE); 465 #ifdef DEBUG 466 if (rv && MDB_ISPID(p->p_pid)) 467 printf("vm_fault(%x, %x, %x, 0) -> %x\n", 468 map, va, ftype, rv); 469 #endif 470 /* 471 * If this was a stack access we keep track of the maximum 472 * accessed stack size. Also, if vm_fault gets a protection 473 * failure it is due to accessing the stack region outside 474 * the current limit and we need to reflect that as an access 475 * error. 476 */ 477 if ((caddr_t)va >= vm->vm_maxsaddr && map != kernel_map) { 478 if (rv == KERN_SUCCESS) { 479 unsigned nss; 480 481 nss = clrnd(btoc(USRSTACK-(unsigned)va)); 482 if (nss > vm->vm_ssize) 483 vm->vm_ssize = nss; 484 } else if (rv == KERN_PROTECTION_FAILURE) 485 rv = KERN_INVALID_ADDRESS; 486 } 487 if (rv == KERN_SUCCESS) { 488 if (type == T_MMUFLT) { 489 #ifdef HP380 490 if (mmutype == MMU_68040) 491 (void) writeback(&frame, 1); 492 #endif 493 return; 494 } 495 goto out; 496 } 497 if (type == T_MMUFLT) { 498 if (p->p_addr->u_pcb.pcb_onfault) 499 goto copyfault; 500 printf("vm_fault(%x, %x, %x, 0) -> %x\n", 501 map, va, ftype, rv); 502 printf(" type %x, code [mmu,,ssw]: %x\n", 503 type, code); 504 goto dopanic; 505 } 506 ucode = v; 507 i = (rv == KERN_PROTECTION_FAILURE) ? SIGBUS : SIGSEGV; 508 break; 509 } 510 } 511 trapsignal(p, i, ucode); 512 if ((type & T_USER) == 0) 513 return; 514 out: 515 userret(p, &frame, sticks, v, 1); 516 } 517 518 #ifdef HP380 519 #ifdef DEBUG 520 struct writebackstats { 521 int calls; 522 int cpushes; 523 int move16s; 524 int wb1s, wb2s, wb3s; 525 int wbsize[4]; 526 } wbstats; 527 528 char *f7sz[] = { "longword", "byte", "word", "line" }; 529 char *f7tt[] = { "normal", "MOVE16", "AFC", "ACK" }; 530 char *f7tm[] = { "d-push", "u-data", "u-code", "M-data", 531 "M-code", "k-data", "k-code", "RES" }; 532 char wberrstr[] = 533 "WARNING: pid %d(%s) writeback [%s] failed, pc=%x fa=%x wba=%x wbd=%x\n"; 534 #endif 535 536 writeback(fp, docachepush) 537 struct frame *fp; 538 int docachepush; 539 { 540 register struct fmt7 *f = &fp->f_fmt7; 541 register struct proc *p = curproc; 542 int err = 0; 543 u_int fa; 544 caddr_t oonfault = p->p_addr->u_pcb.pcb_onfault; 545 546 #ifdef DEBUG 547 if ((mmudebug & MDB_WBFOLLOW) || MDB_ISPID(p->p_pid)) { 548 printf(" pid=%d, fa=%x,", p->p_pid, f->f_fa); 549 dumpssw(f->f_ssw); 550 } 551 wbstats.calls++; 552 #endif 553 /* 554 * Deal with special cases first. 555 */ 556 if ((f->f_ssw & SSW4_TMMASK) == SSW4_TMDCP) { 557 /* 558 * Dcache push fault. 559 * Line-align the address and write out the push data to 560 * the indicated physical address. 561 */ 562 #ifdef DEBUG 563 if ((mmudebug & MDB_WBFOLLOW) || MDB_ISPID(p->p_pid)) { 564 printf(" pushing %s to PA %x, data %x", 565 f7sz[(f->f_ssw & SSW4_SZMASK) >> 5], 566 f->f_fa, f->f_pd0); 567 if ((f->f_ssw & SSW4_SZMASK) == SSW4_SZLN) 568 printf("/%x/%x/%x", 569 f->f_pd1, f->f_pd2, f->f_pd3); 570 printf("\n"); 571 } 572 if (f->f_wb1s & SSW4_WBSV) 573 panic("writeback: cache push with WB1S valid"); 574 wbstats.cpushes++; 575 #endif 576 /* 577 * XXX there are security problems if we attempt to do a 578 * cache push after a signal handler has been called. 579 */ 580 if (docachepush) { 581 pmap_enter(kernel_pmap, (vm_offset_t)vmmap, 582 trunc_page(f->f_fa), VM_PROT_WRITE, TRUE); 583 fa = (u_int)&vmmap[(f->f_fa & PGOFSET) & ~0xF]; 584 bcopy((caddr_t)&f->f_pd0, (caddr_t)fa, 16); 585 DCFL(pmap_extract(kernel_pmap, (vm_offset_t)fa)); 586 pmap_remove(kernel_pmap, (vm_offset_t)vmmap, 587 (vm_offset_t)&vmmap[NBPG]); 588 } else 589 printf("WARNING: pid %d(%s) uid %d: CPUSH not done\n", 590 p->p_pid, p->p_comm, p->p_ucred->cr_uid); 591 } else if ((f->f_ssw & (SSW4_RW|SSW4_TTMASK)) == SSW4_TTM16) { 592 /* 593 * MOVE16 fault. 594 * Line-align the address and write out the push data to 595 * the indicated virtual address. 596 */ 597 #ifdef DEBUG 598 if ((mmudebug & MDB_WBFOLLOW) || MDB_ISPID(p->p_pid)) 599 printf(" MOVE16 to VA %x(%x), data %x/%x/%x/%x\n", 600 f->f_fa, f->f_fa & ~0xF, f->f_pd0, f->f_pd1, 601 f->f_pd2, f->f_pd3); 602 if (f->f_wb1s & SSW4_WBSV) 603 panic("writeback: MOVE16 with WB1S valid"); 604 wbstats.move16s++; 605 #endif 606 if (KDFAULT(f->f_wb1s)) 607 bcopy((caddr_t)&f->f_pd0, (caddr_t)(f->f_fa & ~0xF), 16); 608 else 609 err = suline((caddr_t)(f->f_fa & ~0xF), (caddr_t)&f->f_pd0); 610 if (err) { 611 fa = f->f_fa & ~0xF; 612 #ifdef DEBUG 613 if (mmudebug & MDB_WBFAILED) 614 printf(wberrstr, p->p_pid, p->p_comm, 615 "MOVE16", fp->f_pc, f->f_fa, 616 f->f_fa & ~0xF, f->f_pd0); 617 #endif 618 } 619 } else if (f->f_wb1s & SSW4_WBSV) { 620 /* 621 * Writeback #1. 622 * Position the "memory-aligned" data and write it out. 623 */ 624 register u_int wb1d = f->f_wb1d; 625 register int off; 626 627 #ifdef DEBUG 628 if ((mmudebug & MDB_WBFOLLOW) || MDB_ISPID(p->p_pid)) 629 dumpwb(1, f->f_wb1s, f->f_wb1a, f->f_wb1d); 630 wbstats.wb1s++; 631 wbstats.wbsize[(f->f_wb2s&SSW4_SZMASK)>>5]++; 632 #endif 633 off = (f->f_wb1a & 3) * 8; 634 switch (f->f_wb1s & SSW4_SZMASK) { 635 case SSW4_SZLW: 636 if (off) 637 wb1d = (wb1d >> (32 - off)) | (wb1d << off); 638 if (KDFAULT(f->f_wb1s)) 639 *(long *)f->f_wb1a = wb1d; 640 else 641 err = suword((caddr_t)f->f_wb1a, wb1d); 642 break; 643 case SSW4_SZB: 644 off = 24 - off; 645 if (off) 646 wb1d >>= off; 647 if (KDFAULT(f->f_wb1s)) 648 *(char *)f->f_wb1a = wb1d; 649 else 650 err = subyte((caddr_t)f->f_wb1a, wb1d); 651 break; 652 case SSW4_SZW: 653 off = (off + 16) % 32; 654 if (off) 655 wb1d = (wb1d >> (32 - off)) | (wb1d << off); 656 if (KDFAULT(f->f_wb1s)) 657 *(short *)f->f_wb1a = wb1d; 658 else 659 err = susword((caddr_t)f->f_wb1a, wb1d); 660 break; 661 } 662 if (err) { 663 fa = f->f_wb1a; 664 #ifdef DEBUG 665 if (mmudebug & MDB_WBFAILED) 666 printf(wberrstr, p->p_pid, p->p_comm, 667 "#1", fp->f_pc, f->f_fa, 668 f->f_wb1a, f->f_wb1d); 669 #endif 670 } 671 } 672 /* 673 * Deal with the "normal" writebacks. 674 * 675 * XXX writeback2 is known to reflect a LINE size writeback after 676 * a MOVE16 was already dealt with above. Ignore it. 677 */ 678 if (err == 0 && (f->f_wb2s & SSW4_WBSV) && 679 (f->f_wb2s & SSW4_SZMASK) != SSW4_SZLN) { 680 #ifdef DEBUG 681 if ((mmudebug & MDB_WBFOLLOW) || MDB_ISPID(p->p_pid)) 682 dumpwb(2, f->f_wb2s, f->f_wb2a, f->f_wb2d); 683 wbstats.wb2s++; 684 wbstats.wbsize[(f->f_wb2s&SSW4_SZMASK)>>5]++; 685 #endif 686 switch (f->f_wb2s & SSW4_SZMASK) { 687 case SSW4_SZLW: 688 if (KDFAULT(f->f_wb2s)) 689 *(long *)f->f_wb2a = f->f_wb2d; 690 else 691 err = suword((caddr_t)f->f_wb2a, f->f_wb2d); 692 break; 693 case SSW4_SZB: 694 if (KDFAULT(f->f_wb2s)) 695 *(char *)f->f_wb2a = f->f_wb2d; 696 else 697 err = subyte((caddr_t)f->f_wb2a, f->f_wb2d); 698 break; 699 case SSW4_SZW: 700 if (KDFAULT(f->f_wb2s)) 701 *(short *)f->f_wb2a = f->f_wb2d; 702 else 703 err = susword((caddr_t)f->f_wb2a, f->f_wb2d); 704 break; 705 } 706 if (err) { 707 fa = f->f_wb2a; 708 #ifdef DEBUG 709 if (mmudebug & MDB_WBFAILED) { 710 printf(wberrstr, p->p_pid, p->p_comm, 711 "#2", fp->f_pc, f->f_fa, 712 f->f_wb2a, f->f_wb2d); 713 dumpssw(f->f_ssw); 714 dumpwb(2, f->f_wb2s, f->f_wb2a, f->f_wb2d); 715 } 716 #endif 717 } 718 } 719 if (err == 0 && (f->f_wb3s & SSW4_WBSV)) { 720 #ifdef DEBUG 721 if ((mmudebug & MDB_WBFOLLOW) || MDB_ISPID(p->p_pid)) 722 dumpwb(3, f->f_wb3s, f->f_wb3a, f->f_wb3d); 723 wbstats.wb3s++; 724 wbstats.wbsize[(f->f_wb3s&SSW4_SZMASK)>>5]++; 725 #endif 726 switch (f->f_wb3s & SSW4_SZMASK) { 727 case SSW4_SZLW: 728 if (KDFAULT(f->f_wb3s)) 729 *(long *)f->f_wb3a = f->f_wb3d; 730 else 731 err = suword((caddr_t)f->f_wb3a, f->f_wb3d); 732 break; 733 case SSW4_SZB: 734 if (KDFAULT(f->f_wb3s)) 735 *(char *)f->f_wb3a = f->f_wb3d; 736 else 737 err = subyte((caddr_t)f->f_wb3a, f->f_wb3d); 738 break; 739 case SSW4_SZW: 740 if (KDFAULT(f->f_wb3s)) 741 *(short *)f->f_wb3a = f->f_wb3d; 742 else 743 err = susword((caddr_t)f->f_wb3a, f->f_wb3d); 744 break; 745 #ifdef DEBUG 746 case SSW4_SZLN: 747 panic("writeback: wb3s indicates LINE write"); 748 #endif 749 } 750 if (err) { 751 fa = f->f_wb3a; 752 #ifdef DEBUG 753 if (mmudebug & MDB_WBFAILED) 754 printf(wberrstr, p->p_pid, p->p_comm, 755 "#3", fp->f_pc, f->f_fa, 756 f->f_wb3a, f->f_wb3d); 757 #endif 758 } 759 } 760 p->p_addr->u_pcb.pcb_onfault = oonfault; 761 /* 762 * Determine the cause of the failure if any translating to 763 * a signal. If the corresponding VA is valid and RO it is 764 * a protection fault (SIGBUS) otherwise consider it an 765 * illegal reference (SIGSEGV). 766 */ 767 if (err) { 768 if (vm_map_check_protection(&p->p_vmspace->vm_map, 769 trunc_page(fa), round_page(fa), 770 VM_PROT_READ) && 771 !vm_map_check_protection(&p->p_vmspace->vm_map, 772 trunc_page(fa), round_page(fa), 773 VM_PROT_WRITE)) 774 err = SIGBUS; 775 else 776 err = SIGSEGV; 777 } 778 return(err); 779 } 780 781 #ifdef DEBUG 782 dumpssw(ssw) 783 register u_short ssw; 784 { 785 printf(" SSW: %x: ", ssw); 786 if (ssw & SSW4_CP) 787 printf("CP,"); 788 if (ssw & SSW4_CU) 789 printf("CU,"); 790 if (ssw & SSW4_CT) 791 printf("CT,"); 792 if (ssw & SSW4_CM) 793 printf("CM,"); 794 if (ssw & SSW4_MA) 795 printf("MA,"); 796 if (ssw & SSW4_ATC) 797 printf("ATC,"); 798 if (ssw & SSW4_LK) 799 printf("LK,"); 800 if (ssw & SSW4_RW) 801 printf("RW,"); 802 printf(" SZ=%s, TT=%s, TM=%s\n", 803 f7sz[(ssw & SSW4_SZMASK) >> 5], 804 f7tt[(ssw & SSW4_TTMASK) >> 3], 805 f7tm[ssw & SSW4_TMMASK]); 806 } 807 808 dumpwb(num, s, a, d) 809 int num; 810 u_short s; 811 u_int a, d; 812 { 813 register struct proc *p = curproc; 814 vm_offset_t pa; 815 816 printf(" writeback #%d: VA %x, data %x, SZ=%s, TT=%s, TM=%s\n", 817 num, a, d, f7sz[(s & SSW4_SZMASK) >> 5], 818 f7tt[(s & SSW4_TTMASK) >> 3], f7tm[s & SSW4_TMMASK]); 819 printf(" PA "); 820 pa = pmap_extract(&p->p_vmspace->vm_pmap, (vm_offset_t)a); 821 if (pa == 0) 822 printf("<invalid address>"); 823 else 824 printf("%x, current value %x", pa, fuword((caddr_t)a)); 825 printf("\n"); 826 } 827 828 #ifdef HPFPLIB 829 fppanic(frame) 830 struct fppanicframe { 831 int fpsaveframe; 832 int regs[16]; 833 int fpregs[8*3]; 834 int fpcregs[3]; 835 int hole[5]; 836 int oa6; 837 short sr; 838 int pc; 839 short vector; 840 } frame; 841 { 842 printf("FP exception: pid %d(%s): no busy frame, ft=%x pc=%x vec=%x\n", 843 curproc->p_pid, curproc->p_comm, 844 frame.fpsaveframe, frame.pc, frame.vector); 845 panic("bad FP exception"); 846 } 847 #endif 848 #endif 849 #endif 850 851 /* 852 * Proces a system call. 853 */ 854 syscall(code, frame) 855 u_int code; 856 struct frame frame; 857 { 858 register caddr_t params; 859 register struct sysent *callp; 860 register struct proc *p; 861 int error, opc, numsys, s; 862 u_int argsize; 863 struct args { 864 int i[8]; 865 } args; 866 int rval[2]; 867 u_quad_t sticks; 868 #ifdef HPUXCOMPAT 869 extern struct sysent hpuxsysent[]; 870 extern int hpuxnsysent, notimp(); 871 #endif 872 873 cnt.v_syscall++; 874 if (!USERMODE(frame.f_sr)) 875 panic("syscall"); 876 p = curproc; 877 sticks = p->p_sticks; 878 p->p_md.md_regs = frame.f_regs; 879 opc = frame.f_pc - 2; 880 #ifdef HPUXCOMPAT 881 if (p->p_flag & SHPUX) 882 callp = hpuxsysent, numsys = hpuxnsysent; 883 else 884 #endif 885 callp = sysent, numsys = nsysent; 886 params = (caddr_t)frame.f_regs[SP] + sizeof(int); 887 switch (code) { 888 889 case SYS_indir: 890 /* 891 * Code is first argument, followed by actual args. 892 */ 893 code = fuword(params); 894 params += sizeof(int); 895 break; 896 897 case SYS___indir: 898 /* 899 * Like indir, but code is a quad, so as to maintain 900 * quad alignment for the rest of the arguments. 901 */ 902 #ifdef HPUXCOMPAT 903 if (p->p_flag & SHPUX) 904 break; 905 #endif 906 code = fuword(params + _QUAD_LOWWORD * sizeof(int)); 907 params += sizeof(quad_t); 908 break; 909 910 default: 911 /* nothing to do by default */ 912 break; 913 } 914 if (code < numsys) 915 callp += code; 916 else 917 callp += SYS_indir; /* => nosys */ 918 argsize = callp->sy_narg * sizeof(int); 919 if (argsize && (error = copyin(params, (caddr_t)&args, argsize))) { 920 #ifdef KTRACE 921 if (KTRPOINT(p, KTR_SYSCALL)) 922 ktrsyscall(p->p_tracep, code, callp->sy_narg, args.i); 923 #endif 924 goto bad; 925 } 926 #ifdef KTRACE 927 if (KTRPOINT(p, KTR_SYSCALL)) 928 ktrsyscall(p->p_tracep, code, callp->sy_narg, args.i); 929 #endif 930 rval[0] = 0; 931 rval[1] = frame.f_regs[D1]; 932 #ifdef HPUXCOMPAT 933 /* debug kludge */ 934 if (callp->sy_call == notimp) 935 error = notimp(p, args.i, rval, code, callp->sy_narg); 936 else 937 #endif 938 error = (*callp->sy_call)(p, &args, rval); 939 switch (error) { 940 941 case 0: 942 /* 943 * Reinitialize proc pointer `p' as it may be different 944 * if this is a child returning from fork syscall. 945 */ 946 p = curproc; 947 frame.f_regs[D0] = rval[0]; 948 frame.f_regs[D1] = rval[1]; 949 frame.f_sr &= ~PSL_C; 950 break; 951 952 case ERESTART: 953 frame.f_pc = opc; 954 break; 955 956 case EJUSTRETURN: 957 break; /* nothing to do */ 958 959 default: 960 bad: 961 #ifdef HPUXCOMPAT 962 if (p->p_flag & SHPUX) 963 error = bsdtohpuxerrno(error); 964 #endif 965 frame.f_regs[D0] = error; 966 frame.f_sr |= PSL_C; 967 break; 968 } 969 970 userret(p, &frame, sticks, (u_int)0, 0); 971 #ifdef KTRACE 972 if (KTRPOINT(p, KTR_SYSRET)) 973 ktrsysret(p->p_tracep, code, error, rval[0]); 974 #endif 975 } 976