1 /*- 2 * Copyright (C) 1994, David Greenman 3 * Copyright (c) 1990, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * the University of Utah, and William Jolitz. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * from: @(#)trap.c 7.4 (Berkeley) 5/13/91 38 * $Id: trap.c,v 1.61 1995/10/09 04:36:01 bde Exp $ 39 */ 40 41 /* 42 * 386 Trap and System call handling 43 */ 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/proc.h> 48 #include <sys/user.h> 49 #include <sys/acct.h> 50 #include <sys/kernel.h> 51 #include <sys/syscall.h> 52 #include <sys/sysent.h> 53 #ifdef KTRACE 54 #include <sys/ktrace.h> 55 #endif 56 57 #include <vm/vm_param.h> 58 #include <vm/pmap.h> 59 #include <vm/vm_kern.h> 60 #include <vm/vm_map.h> 61 #include <vm/vm_page.h> 62 63 #include <machine/cpu.h> 64 #include <machine/md_var.h> 65 #include <machine/psl.h> 66 #include <machine/reg.h> 67 #include <machine/trap.h> 68 #include <machine/../isa/isa_device.h> 69 70 #ifdef POWERFAIL_NMI 71 # include <syslog.h> 72 # include <machine/clock.h> 73 #endif 74 75 #include "isa.h" 76 #include "npx.h" 77 78 extern void trap __P((struct trapframe frame)); 79 extern int trapwrite __P((unsigned addr)); 80 extern void syscall __P((struct trapframe frame)); 81 extern void linux_syscall __P((struct trapframe frame)); 82 83 int trap_pfault __P((struct trapframe *, int)); 84 void trap_fatal __P((struct trapframe *)); 85 86 extern inthand_t IDTVEC(syscall); 87 88 #define MAX_TRAP_MSG 27 89 char *trap_msg[] = { 90 "", /* 0 unused */ 91 "privileged instruction fault", /* 1 T_PRIVINFLT */ 92 "", /* 2 unused */ 93 "breakpoint instruction fault", /* 3 T_BPTFLT */ 94 "", /* 4 unused */ 95 "", /* 5 unused */ 96 "arithmetic trap", /* 6 T_ARITHTRAP */ 97 "system forced exception", /* 7 T_ASTFLT */ 98 "", /* 8 unused */ 99 "general protection fault", /* 9 T_PROTFLT */ 100 "trace trap", /* 10 T_TRCTRAP */ 101 "", /* 11 unused */ 102 "page fault", /* 12 T_PAGEFLT */ 103 "", /* 13 unused */ 104 "alignment fault", /* 14 T_ALIGNFLT */ 105 "", /* 15 unused */ 106 "", /* 16 unused */ 107 "", /* 17 unused */ 108 "integer divide fault", /* 18 T_DIVIDE */ 109 "non-maskable interrupt trap", /* 19 T_NMI */ 110 "overflow trap", /* 20 T_OFLOW */ 111 "FPU bounds check fault", /* 21 T_BOUND */ 112 "FPU device not available", /* 22 T_DNA */ 113 "double fault", /* 23 T_DOUBLEFLT */ 114 "FPU operand fetch fault", /* 24 T_FPOPFLT */ 115 "invalid TSS fault", /* 25 T_TSSFLT */ 116 "segment not present fault", /* 26 T_SEGNPFLT */ 117 "stack fault", /* 27 T_STKFLT */ 118 }; 119 120 static void userret __P((struct proc *p, struct trapframe *frame, 121 u_quad_t oticks)); 122 123 static inline void 124 userret(p, frame, oticks) 125 struct proc *p; 126 struct trapframe *frame; 127 u_quad_t oticks; 128 { 129 int sig, s; 130 131 while ((sig = CURSIG(p)) != 0) 132 postsig(sig); 133 p->p_priority = p->p_usrpri; 134 if (want_resched) { 135 /* 136 * Since we are curproc, clock will normally just change 137 * our priority without moving us from one queue to another 138 * (since the running process is not on a queue.) 139 * If that happened after we setrunqueue ourselves but before we 140 * mi_switch()'ed, we might not be on the queue indicated by 141 * our priority. 142 */ 143 s = splclock(); 144 setrunqueue(p); 145 p->p_stats->p_ru.ru_nivcsw++; 146 mi_switch(); 147 splx(s); 148 while ((sig = CURSIG(p)) != 0) 149 postsig(sig); 150 } 151 /* 152 * Charge system time if profiling. 153 */ 154 if (p->p_flag & P_PROFIL) { 155 u_quad_t ticks = p->p_sticks - oticks; 156 157 if (ticks) { 158 #ifdef PROFTIMER 159 extern int profscale; 160 addupc(frame->tf_eip, &p->p_stats->p_prof, 161 ticks * profscale); 162 #else 163 addupc(frame->tf_eip, &p->p_stats->p_prof, ticks); 164 #endif 165 } 166 } 167 curpriority = p->p_priority; 168 } 169 170 /* 171 * Exception, fault, and trap interface to the FreeBSD kernel. 172 * This common code is called from assembly language IDT gate entry 173 * routines that prepare a suitable stack frame, and restore this 174 * frame after the exception has been processed. 175 */ 176 177 void 178 trap(frame) 179 struct trapframe frame; 180 { 181 struct proc *p = curproc; 182 u_quad_t sticks = 0; 183 int i = 0, ucode = 0, type, code; 184 #ifdef DEBUG 185 u_long eva; 186 #endif 187 188 type = frame.tf_trapno; 189 code = frame.tf_err; 190 191 if (ISPL(frame.tf_cs) == SEL_UPL) { 192 /* user trap */ 193 194 sticks = p->p_sticks; 195 p->p_md.md_regs = (int *)&frame; 196 197 switch (type) { 198 case T_PRIVINFLT: /* privileged instruction fault */ 199 ucode = type; 200 i = SIGILL; 201 break; 202 203 case T_BPTFLT: /* bpt instruction fault */ 204 case T_TRCTRAP: /* trace trap */ 205 frame.tf_eflags &= ~PSL_T; 206 i = SIGTRAP; 207 break; 208 209 case T_ARITHTRAP: /* arithmetic trap */ 210 ucode = code; 211 i = SIGFPE; 212 break; 213 214 case T_ASTFLT: /* Allow process switch */ 215 astoff(); 216 cnt.v_soft++; 217 if (p->p_flag & P_OWEUPC) { 218 addupc(frame.tf_eip, &p->p_stats->p_prof, 1); 219 p->p_flag &= ~P_OWEUPC; 220 } 221 goto out; 222 223 case T_PROTFLT: /* general protection fault */ 224 case T_SEGNPFLT: /* segment not present fault */ 225 case T_STKFLT: /* stack fault */ 226 case T_TSSFLT: /* invalid TSS fault */ 227 case T_DOUBLEFLT: /* double fault */ 228 default: 229 ucode = code + BUS_SEGM_FAULT ; 230 i = SIGBUS; 231 break; 232 233 case T_PAGEFLT: /* page fault */ 234 i = trap_pfault(&frame, TRUE); 235 if (i == -1) 236 return; 237 if (i == 0) 238 goto out; 239 240 ucode = T_PAGEFLT; 241 break; 242 243 case T_DIVIDE: /* integer divide fault */ 244 ucode = FPE_INTDIV_TRAP; 245 i = SIGFPE; 246 break; 247 248 #if NISA > 0 249 case T_NMI: 250 #ifdef POWERFAIL_NMI 251 goto handle_powerfail; 252 #else /* !POWERFAIL_NMI */ 253 #ifdef DDB 254 /* NMI can be hooked up to a pushbutton for debugging */ 255 printf ("NMI ... going to debugger\n"); 256 if (kdb_trap (type, 0, &frame)) 257 return; 258 #endif /* DDB */ 259 /* machine/parity/power fail/"kitchen sink" faults */ 260 if (isa_nmi(code) == 0) return; 261 panic("NMI indicates hardware failure"); 262 #endif /* POWERFAIL_NMI */ 263 #endif /* NISA > 0 */ 264 265 case T_OFLOW: /* integer overflow fault */ 266 ucode = FPE_INTOVF_TRAP; 267 i = SIGFPE; 268 break; 269 270 case T_BOUND: /* bounds check fault */ 271 ucode = FPE_SUBRNG_TRAP; 272 i = SIGFPE; 273 break; 274 275 case T_DNA: 276 #if NNPX > 0 277 /* if a transparent fault (due to context switch "late") */ 278 if (npxdna()) 279 return; 280 #endif /* NNPX > 0 */ 281 282 #if defined(MATH_EMULATE) || defined(GPL_MATH_EMULATE) 283 i = math_emulate(&frame); 284 if (i == 0) { 285 if (!(frame.tf_eflags & PSL_T)) 286 return; 287 frame.tf_eflags &= ~PSL_T; 288 i = SIGTRAP; 289 } 290 /* else ucode = emulator_only_knows() XXX */ 291 #else /* MATH_EMULATE || GPL_MATH_EMULATE */ 292 i = SIGFPE; 293 ucode = FPE_FPU_NP_TRAP; 294 #endif /* MATH_EMULATE || GPL_MATH_EMULATE */ 295 break; 296 297 case T_FPOPFLT: /* FPU operand fetch fault */ 298 ucode = T_FPOPFLT; 299 i = SIGILL; 300 break; 301 } 302 } else { 303 /* kernel trap */ 304 305 switch (type) { 306 case T_PAGEFLT: /* page fault */ 307 (void) trap_pfault(&frame, FALSE); 308 return; 309 310 case T_PROTFLT: /* general protection fault */ 311 case T_SEGNPFLT: /* segment not present fault */ 312 /* 313 * Invalid segment selectors and out of bounds 314 * %eip's and %esp's can be set up in user mode. 315 * This causes a fault in kernel mode when the 316 * kernel tries to return to user mode. We want 317 * to get this fault so that we can fix the 318 * problem here and not have to check all the 319 * selectors and pointers when the user changes 320 * them. 321 */ 322 #define MAYBE_DORETI_FAULT(where, whereto) \ 323 do { \ 324 if (frame.tf_eip == (int)where) { \ 325 frame.tf_eip = (int)whereto; \ 326 return; \ 327 } \ 328 } while (0) 329 330 if (intr_nesting_level == 0) { 331 MAYBE_DORETI_FAULT(doreti_iret, 332 doreti_iret_fault); 333 MAYBE_DORETI_FAULT(doreti_popl_ds, 334 doreti_popl_ds_fault); 335 MAYBE_DORETI_FAULT(doreti_popl_es, 336 doreti_popl_es_fault); 337 } 338 if (curpcb && curpcb->pcb_onfault) { 339 frame.tf_eip = (int)curpcb->pcb_onfault; 340 return; 341 } 342 break; 343 344 case T_TSSFLT: 345 /* 346 * PSL_NT can be set in user mode and isn't cleared 347 * automatically when the kernel is entered. This 348 * causes a TSS fault when the kernel attempts to 349 * `iret' because the TSS link is uninitialized. We 350 * want to get this fault so that we can fix the 351 * problem here and not every time the kernel is 352 * entered. 353 */ 354 if (frame.tf_eflags & PSL_NT) { 355 frame.tf_eflags &= ~PSL_NT; 356 return; 357 } 358 break; 359 360 case T_TRCTRAP: /* trace trap */ 361 if (frame.tf_eip == (int)IDTVEC(syscall)) { 362 /* 363 * We've just entered system mode via the 364 * syscall lcall. Continue single stepping 365 * silently until the syscall handler has 366 * saved the flags. 367 */ 368 return; 369 } 370 if (frame.tf_eip == (int)IDTVEC(syscall) + 1) { 371 /* 372 * The syscall handler has now saved the 373 * flags. Stop single stepping it. 374 */ 375 frame.tf_eflags &= ~PSL_T; 376 return; 377 } 378 /* 379 * Fall through. 380 */ 381 case T_BPTFLT: 382 /* 383 * If DDB is enabled, let it handle the debugger trap. 384 * Otherwise, debugger traps "can't happen". 385 */ 386 #ifdef DDB 387 if (kdb_trap (type, 0, &frame)) 388 return; 389 #endif 390 break; 391 392 #if NISA > 0 393 case T_NMI: 394 #ifdef POWERFAIL_NMI 395 #ifndef TIMER_FREQ 396 # define TIMER_FREQ 1193182 397 #endif 398 handle_powerfail: 399 { 400 static unsigned lastalert = 0; 401 402 if(time.tv_sec - lastalert > 10) 403 { 404 log(LOG_WARNING, "NMI: power fail\n"); 405 sysbeep(TIMER_FREQ/880, hz); 406 lastalert = time.tv_sec; 407 } 408 return; 409 } 410 #else /* !POWERFAIL_NMI */ 411 #ifdef DDB 412 /* NMI can be hooked up to a pushbutton for debugging */ 413 printf ("NMI ... going to debugger\n"); 414 if (kdb_trap (type, 0, &frame)) 415 return; 416 #endif /* DDB */ 417 /* machine/parity/power fail/"kitchen sink" faults */ 418 if (isa_nmi(code) == 0) return; 419 /* FALL THROUGH */ 420 #endif /* POWERFAIL_NMI */ 421 #endif /* NISA > 0 */ 422 } 423 424 trap_fatal(&frame); 425 return; 426 } 427 428 trapsignal(p, i, ucode); 429 430 #ifdef DEBUG 431 eva = rcr2(); 432 if (type <= MAX_TRAP_MSG) { 433 uprintf("fatal process exception: %s", 434 trap_msg[type]); 435 if ((type == T_PAGEFLT) || (type == T_PROTFLT)) 436 uprintf(", fault VA = 0x%x", eva); 437 uprintf("\n"); 438 } 439 #endif 440 441 out: 442 userret(p, &frame, sticks); 443 } 444 445 #ifdef notyet 446 /* 447 * This version doesn't allow a page fault to user space while 448 * in the kernel. The rest of the kernel needs to be made "safe" 449 * before this can be used. I think the only things remaining 450 * to be made safe are the iBCS2 code and the process tracing/ 451 * debugging code. 452 */ 453 int 454 trap_pfault(frame, usermode) 455 struct trapframe *frame; 456 int usermode; 457 { 458 vm_offset_t va; 459 struct vmspace *vm = NULL; 460 vm_map_t map = 0; 461 int rv = 0; 462 vm_prot_t ftype; 463 int eva; 464 struct proc *p = curproc; 465 466 if (frame->tf_err & PGEX_W) 467 ftype = VM_PROT_READ | VM_PROT_WRITE; 468 else 469 ftype = VM_PROT_READ; 470 471 eva = rcr2(); 472 va = trunc_page((vm_offset_t)eva); 473 474 if (va < VM_MIN_KERNEL_ADDRESS) { 475 vm_offset_t v; 476 vm_page_t ptepg; 477 478 if (p == NULL || 479 (!usermode && va < VM_MAXUSER_ADDRESS && 480 (curpcb == NULL || curpcb->pcb_onfault == NULL))) { 481 trap_fatal(frame); 482 return (-1); 483 } 484 485 /* 486 * This is a fault on non-kernel virtual memory. 487 * vm is initialized above to NULL. If curproc is NULL 488 * or curproc->p_vmspace is NULL the fault is fatal. 489 */ 490 vm = p->p_vmspace; 491 if (vm == NULL) 492 goto nogo; 493 494 map = &vm->vm_map; 495 496 /* 497 * Keep swapout from messing with us during this 498 * critical time. 499 */ 500 ++p->p_lock; 501 502 /* 503 * Grow the stack if necessary 504 */ 505 if ((caddr_t)va > vm->vm_maxsaddr 506 && (caddr_t)va < (caddr_t)USRSTACK) { 507 if (!grow(p, va)) { 508 rv = KERN_FAILURE; 509 --p->p_lock; 510 goto nogo; 511 } 512 } 513 514 /* 515 * Check if page table is mapped, if not, 516 * fault it first 517 */ 518 v = (vm_offset_t) vtopte(va); 519 520 /* Fault the pte only if needed: */ 521 if (*((int *)vtopte(v)) == 0) 522 (void) vm_fault(map, trunc_page(v), VM_PROT_WRITE, FALSE); 523 524 pmap_use_pt( vm_map_pmap(map), va); 525 526 /* Fault in the user page: */ 527 rv = vm_fault(map, va, ftype, FALSE); 528 529 pmap_unuse_pt( vm_map_pmap(map), va); 530 531 --p->p_lock; 532 } else { 533 /* 534 * Don't allow user-mode faults in kernel address space. 535 */ 536 if (usermode) 537 goto nogo; 538 539 /* 540 * Since we know that kernel virtual address addresses 541 * always have pte pages mapped, we just have to fault 542 * the page. 543 */ 544 rv = vm_fault(kernel_map, va, ftype, FALSE); 545 } 546 547 if (rv == KERN_SUCCESS) 548 return (0); 549 nogo: 550 if (!usermode) { 551 if (curpcb && curpcb->pcb_onfault) { 552 frame->tf_eip = (int)curpcb->pcb_onfault; 553 return (0); 554 } 555 trap_fatal(frame); 556 return (-1); 557 } 558 559 /* kludge to pass faulting virtual address to sendsig */ 560 frame->tf_err = eva; 561 562 return((rv == KERN_PROTECTION_FAILURE) ? SIGBUS : SIGSEGV); 563 } 564 #endif 565 566 int 567 trap_pfault(frame, usermode) 568 struct trapframe *frame; 569 int usermode; 570 { 571 vm_offset_t va; 572 struct vmspace *vm = NULL; 573 vm_map_t map = 0; 574 int rv = 0; 575 vm_prot_t ftype; 576 int eva; 577 struct proc *p = curproc; 578 579 eva = rcr2(); 580 va = trunc_page((vm_offset_t)eva); 581 582 if (va >= KERNBASE) { 583 /* 584 * Don't allow user-mode faults in kernel address space. 585 */ 586 if (usermode) 587 goto nogo; 588 589 map = kernel_map; 590 } else { 591 /* 592 * This is a fault on non-kernel virtual memory. 593 * vm is initialized above to NULL. If curproc is NULL 594 * or curproc->p_vmspace is NULL the fault is fatal. 595 */ 596 if (p != NULL) 597 vm = p->p_vmspace; 598 599 if (vm == NULL) 600 goto nogo; 601 602 map = &vm->vm_map; 603 } 604 605 if (frame->tf_err & PGEX_W) 606 ftype = VM_PROT_READ | VM_PROT_WRITE; 607 else 608 ftype = VM_PROT_READ; 609 610 if (map != kernel_map) { 611 vm_offset_t v; 612 613 /* 614 * Keep swapout from messing with us during this 615 * critical time. 616 */ 617 ++p->p_lock; 618 619 /* 620 * Grow the stack if necessary 621 */ 622 if ((caddr_t)va > vm->vm_maxsaddr 623 && (caddr_t)va < (caddr_t)USRSTACK) { 624 if (!grow(p, va)) { 625 rv = KERN_FAILURE; 626 --p->p_lock; 627 goto nogo; 628 } 629 } 630 631 /* 632 * Check if page table is mapped, if not, 633 * fault it first 634 */ 635 v = (vm_offset_t) vtopte(va); 636 637 /* Fault the pte only if needed: */ 638 if (*((int *)vtopte(v)) == 0) 639 (void) vm_fault(map, trunc_page(v), VM_PROT_WRITE, FALSE); 640 641 pmap_use_pt( vm_map_pmap(map), va); 642 643 /* Fault in the user page: */ 644 rv = vm_fault(map, va, ftype, FALSE); 645 646 pmap_unuse_pt( vm_map_pmap(map), va); 647 648 --p->p_lock; 649 } else { 650 /* 651 * Since we know that kernel virtual address addresses 652 * always have pte pages mapped, we just have to fault 653 * the page. 654 */ 655 rv = vm_fault(map, va, ftype, FALSE); 656 } 657 658 if (rv == KERN_SUCCESS) 659 return (0); 660 nogo: 661 if (!usermode) { 662 if (curpcb && curpcb->pcb_onfault) { 663 frame->tf_eip = (int)curpcb->pcb_onfault; 664 return (0); 665 } 666 trap_fatal(frame); 667 return (-1); 668 } 669 670 /* kludge to pass faulting virtual address to sendsig */ 671 frame->tf_err = eva; 672 673 return((rv == KERN_PROTECTION_FAILURE) ? SIGBUS : SIGSEGV); 674 } 675 676 void 677 trap_fatal(frame) 678 struct trapframe *frame; 679 { 680 int code, type, eva; 681 struct soft_segment_descriptor softseg; 682 683 code = frame->tf_err; 684 type = frame->tf_trapno; 685 eva = rcr2(); 686 sdtossd(&gdt[IDXSEL(frame->tf_cs & 0xffff)].sd, &softseg); 687 688 if (type <= MAX_TRAP_MSG) 689 printf("\n\nFatal trap %d: %s while in %s mode\n", 690 type, trap_msg[type], 691 ISPL(frame->tf_cs) == SEL_UPL ? "user" : "kernel"); 692 if (type == T_PAGEFLT) { 693 printf("fault virtual address = 0x%x\n", eva); 694 printf("fault code = %s %s, %s\n", 695 code & PGEX_U ? "user" : "supervisor", 696 code & PGEX_W ? "write" : "read", 697 code & PGEX_P ? "protection violation" : "page not present"); 698 } 699 printf("instruction pointer = 0x%x:0x%x\n", frame->tf_cs & 0xffff, frame->tf_eip); 700 printf("code segment = base 0x%x, limit 0x%x, type 0x%x\n", 701 softseg.ssd_base, softseg.ssd_limit, softseg.ssd_type); 702 printf(" = DPL %d, pres %d, def32 %d, gran %d\n", 703 softseg.ssd_dpl, softseg.ssd_p, softseg.ssd_def32, softseg.ssd_gran); 704 printf("processor eflags = "); 705 if (frame->tf_eflags & PSL_T) 706 printf("trace/trap, "); 707 if (frame->tf_eflags & PSL_I) 708 printf("interrupt enabled, "); 709 if (frame->tf_eflags & PSL_NT) 710 printf("nested task, "); 711 if (frame->tf_eflags & PSL_RF) 712 printf("resume, "); 713 if (frame->tf_eflags & PSL_VM) 714 printf("vm86, "); 715 printf("IOPL = %d\n", (frame->tf_eflags & PSL_IOPL) >> 12); 716 printf("current process = "); 717 if (curproc) { 718 printf("%lu (%s)\n", 719 (u_long)curproc->p_pid, curproc->p_comm ? 720 curproc->p_comm : ""); 721 } else { 722 printf("Idle\n"); 723 } 724 printf("interrupt mask = "); 725 if ((cpl & net_imask) == net_imask) 726 printf("net "); 727 if ((cpl & tty_imask) == tty_imask) 728 printf("tty "); 729 if ((cpl & bio_imask) == bio_imask) 730 printf("bio "); 731 if (cpl == 0) 732 printf("none"); 733 printf("\n"); 734 735 #ifdef KDB 736 if (kdb_trap(&psl)) 737 return; 738 #endif 739 #ifdef DDB 740 if (kdb_trap (type, 0, frame)) 741 return; 742 #endif 743 if (type <= MAX_TRAP_MSG) 744 panic(trap_msg[type]); 745 else 746 panic("unknown/reserved trap"); 747 } 748 749 /* 750 * Compensate for 386 brain damage (missing URKR). 751 * This is a little simpler than the pagefault handler in trap() because 752 * it the page tables have already been faulted in and high addresses 753 * are thrown out early for other reasons. 754 */ 755 int trapwrite(addr) 756 unsigned addr; 757 { 758 struct proc *p; 759 vm_offset_t va, v; 760 struct vmspace *vm; 761 int rv; 762 763 va = trunc_page((vm_offset_t)addr); 764 /* 765 * XXX - MAX is END. Changed > to >= for temp. fix. 766 */ 767 if (va >= VM_MAXUSER_ADDRESS) 768 return (1); 769 770 p = curproc; 771 vm = p->p_vmspace; 772 773 ++p->p_lock; 774 775 if ((caddr_t)va >= vm->vm_maxsaddr 776 && (caddr_t)va < (caddr_t)USRSTACK) { 777 if (!grow(p, va)) { 778 --p->p_lock; 779 return (1); 780 } 781 } 782 783 v = trunc_page(vtopte(va)); 784 785 /* 786 * wire the pte page 787 */ 788 if (va < USRSTACK) { 789 vm_map_pageable(&vm->vm_map, v, round_page(v+1), FALSE); 790 } 791 792 /* 793 * fault the data page 794 */ 795 rv = vm_fault(&vm->vm_map, va, VM_PROT_READ|VM_PROT_WRITE, FALSE); 796 797 /* 798 * unwire the pte page 799 */ 800 if (va < USRSTACK) { 801 vm_map_pageable(&vm->vm_map, v, round_page(v+1), TRUE); 802 } 803 804 --p->p_lock; 805 806 if (rv != KERN_SUCCESS) 807 return 1; 808 809 return (0); 810 } 811 812 /* 813 * System call request from POSIX system call gate interface to kernel. 814 * Like trap(), argument is call by reference. 815 */ 816 void 817 syscall(frame) 818 struct trapframe frame; 819 { 820 caddr_t params; 821 int i; 822 struct sysent *callp; 823 struct proc *p = curproc; 824 u_quad_t sticks; 825 int error; 826 int args[8], rval[2]; 827 u_int code; 828 829 sticks = p->p_sticks; 830 if (ISPL(frame.tf_cs) != SEL_UPL) 831 panic("syscall"); 832 833 p->p_md.md_regs = (int *)&frame; 834 params = (caddr_t)frame.tf_esp + sizeof(int); 835 code = frame.tf_eax; 836 /* 837 * Need to check if this is a 32 bit or 64 bit syscall. 838 */ 839 if (code == SYS_syscall) { 840 /* 841 * Code is first argument, followed by actual args. 842 */ 843 code = fuword(params); 844 params += sizeof(int); 845 } else if (code == SYS___syscall) { 846 /* 847 * Like syscall, but code is a quad, so as to maintain 848 * quad alignment for the rest of the arguments. 849 */ 850 code = fuword(params); 851 params += sizeof(quad_t); 852 } 853 854 if (p->p_sysent->sv_mask) 855 code &= p->p_sysent->sv_mask; 856 857 if (code >= p->p_sysent->sv_size) 858 callp = &p->p_sysent->sv_table[0]; 859 else 860 callp = &p->p_sysent->sv_table[code]; 861 862 if ((i = callp->sy_narg * sizeof(int)) && 863 (error = copyin(params, (caddr_t)args, (u_int)i))) { 864 #ifdef KTRACE 865 if (KTRPOINT(p, KTR_SYSCALL)) 866 ktrsyscall(p->p_tracep, code, callp->sy_narg, args); 867 #endif 868 goto bad; 869 } 870 #ifdef KTRACE 871 if (KTRPOINT(p, KTR_SYSCALL)) 872 ktrsyscall(p->p_tracep, code, callp->sy_narg, args); 873 #endif 874 rval[0] = 0; 875 rval[1] = frame.tf_edx; 876 877 error = (*callp->sy_call)(p, args, rval); 878 879 switch (error) { 880 881 case 0: 882 /* 883 * Reinitialize proc pointer `p' as it may be different 884 * if this is a child returning from fork syscall. 885 */ 886 p = curproc; 887 frame.tf_eax = rval[0]; 888 frame.tf_edx = rval[1]; 889 frame.tf_eflags &= ~PSL_C; 890 break; 891 892 case ERESTART: 893 /* 894 * Reconstruct pc, assuming lcall $X,y is 7 bytes. 895 */ 896 frame.tf_eip -= 7; 897 break; 898 899 case EJUSTRETURN: 900 break; 901 902 default: 903 bad: 904 if (p->p_sysent->sv_errsize) 905 if (error >= p->p_sysent->sv_errsize) 906 error = -1; /* XXX */ 907 else 908 error = p->p_sysent->sv_errtbl[error]; 909 frame.tf_eax = error; 910 frame.tf_eflags |= PSL_C; 911 break; 912 } 913 914 if (frame.tf_eflags & PSL_T) { 915 /* Traced syscall. */ 916 frame.tf_eflags &= ~PSL_T; 917 trapsignal(p, SIGTRAP, 0); 918 } 919 920 userret(p, &frame, sticks); 921 922 #ifdef KTRACE 923 if (KTRPOINT(p, KTR_SYSRET)) 924 ktrsysret(p->p_tracep, code, error, rval[0]); 925 #endif 926 } 927 928 #ifdef COMPAT_LINUX 929 void 930 linux_syscall(frame) 931 struct trapframe frame; 932 { 933 struct proc *p = curproc; 934 struct sysent *callp; 935 u_quad_t sticks; 936 int error; 937 int rval[2]; 938 u_int code; 939 struct linux_syscall_args { 940 int arg1; 941 int arg2; 942 int arg3; 943 int arg4; 944 int arg5; 945 } args; 946 947 args.arg1 = frame.tf_ebx; 948 args.arg2 = frame.tf_ecx; 949 args.arg3 = frame.tf_edx; 950 args.arg4 = frame.tf_esi; 951 args.arg5 = frame.tf_edi; 952 953 sticks = p->p_sticks; 954 if (ISPL(frame.tf_cs) != SEL_UPL) 955 panic("linux syscall"); 956 957 p->p_md.md_regs = (int *)&frame; 958 code = frame.tf_eax; 959 960 if (p->p_sysent->sv_mask) 961 code &= p->p_sysent->sv_mask; 962 963 if (code >= p->p_sysent->sv_size) 964 callp = &p->p_sysent->sv_table[0]; 965 else 966 callp = &p->p_sysent->sv_table[code]; 967 968 #ifdef KTRACE 969 if (KTRPOINT(p, KTR_SYSCALL)) 970 ktrsyscall(p->p_tracep, code, callp->sy_narg, (int *)&args); 971 #endif 972 973 rval[0] = 0; 974 975 error = (*callp->sy_call)(p, &args, rval); 976 977 switch (error) { 978 979 case 0: 980 /* 981 * Reinitialize proc pointer `p' as it may be different 982 * if this is a child returning from fork syscall. 983 */ 984 p = curproc; 985 frame.tf_eax = rval[0]; 986 frame.tf_eflags &= ~PSL_C; 987 break; 988 989 case ERESTART: 990 /* Reconstruct pc, subtract size of int 0x80 */ 991 frame.tf_eip -= 2; 992 break; 993 994 case EJUSTRETURN: 995 break; 996 997 default: 998 if (p->p_sysent->sv_errsize) 999 if (error >= p->p_sysent->sv_errsize) 1000 error = -1; /* XXX */ 1001 else 1002 error = p->p_sysent->sv_errtbl[error]; 1003 frame.tf_eax = -error; 1004 frame.tf_eflags |= PSL_C; 1005 break; 1006 } 1007 1008 if (frame.tf_eflags & PSL_T) { 1009 /* Traced syscall. */ 1010 frame.tf_eflags &= ~PSL_T; 1011 trapsignal(p, SIGTRAP, 0); 1012 } 1013 1014 userret(p, &frame, sticks); 1015 1016 #ifdef KTRACE 1017 if (KTRPOINT(p, KTR_SYSRET)) 1018 ktrsysret(p->p_tracep, code, error, rval[0]); 1019 #endif 1020 } 1021 #endif /* COMPAT_LINUX */ 1022