Annotation of sys/arch/amd64/amd64/trap.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: trap.c,v 1.13 2007/05/11 10:06:55 pedro Exp $ */
2: /* $NetBSD: trap.c,v 1.2 2003/05/04 23:51:56 fvdl Exp $ */
3:
4: /*-
5: * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to The NetBSD Foundation
9: * by Charles M. Hannum.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. All advertising materials mentioning features or use of this software
20: * must display the following acknowledgement:
21: * This product includes software developed by the NetBSD
22: * Foundation, Inc. and its contributors.
23: * 4. Neither the name of The NetBSD Foundation nor the names of its
24: * contributors may be used to endorse or promote products derived
25: * from this software without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37: * POSSIBILITY OF SUCH DAMAGE.
38: */
39:
40: /*-
41: * Copyright (c) 1990 The Regents of the University of California.
42: * All rights reserved.
43: *
44: * This code is derived from software contributed to Berkeley by
45: * the University of Utah, and William Jolitz.
46: *
47: * Redistribution and use in source and binary forms, with or without
48: * modification, are permitted provided that the following conditions
49: * are met:
50: * 1. Redistributions of source code must retain the above copyright
51: * notice, this list of conditions and the following disclaimer.
52: * 2. Redistributions in binary form must reproduce the above copyright
53: * notice, this list of conditions and the following disclaimer in the
54: * documentation and/or other materials provided with the distribution.
55: * 3. Neither the name of the University nor the names of its contributors
56: * may be used to endorse or promote products derived from this software
57: * without specific prior written permission.
58: *
59: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
60: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
63: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
69: * SUCH DAMAGE.
70: *
71: * @(#)trap.c 7.4 (Berkeley) 5/13/91
72: */
73:
74: /*
75: * amd64 Trap and System call handling
76: */
77: #undef TRAP_SIGDEBUG
78:
79: #include <sys/param.h>
80: #include <sys/systm.h>
81: #include <sys/proc.h>
82: #include <sys/user.h>
83: #include <sys/acct.h>
84: #include <sys/kernel.h>
85: #include <sys/signal.h>
86: #include <sys/syscall.h>
87: #include <sys/reboot.h>
88: #include <sys/pool.h>
89:
90: #include <uvm/uvm_extern.h>
91:
92: #include <machine/cpu.h>
93: #include <machine/cpufunc.h>
94: #include <machine/fpu.h>
95: #include <machine/psl.h>
96: #include <machine/reg.h>
97: #include <machine/trap.h>
98: #include <machine/userret.h>
99: #ifdef DDB
100: #include <machine/db_machdep.h>
101: #endif
102:
103: #include "isa.h"
104:
105: #ifdef KGDB
106: #include <sys/kgdb.h>
107: #endif
108:
109: void trap(struct trapframe);
110:
111: const char *trap_type[] = {
112: "privileged instruction fault", /* 0 T_PRIVINFLT */
113: "breakpoint trap", /* 1 T_BPTFLT */
114: "arithmetic trap", /* 2 T_ARITHTRAP */
115: "asynchronous system trap", /* 3 T_ASTFLT */
116: "protection fault", /* 4 T_PROTFLT */
117: "trace trap", /* 5 T_TRCTRAP */
118: "page fault", /* 6 T_PAGEFLT */
119: "alignment fault", /* 7 T_ALIGNFLT */
120: "integer divide fault", /* 8 T_DIVIDE */
121: "non-maskable interrupt", /* 9 T_NMI */
122: "overflow trap", /* 10 T_OFLOW */
123: "bounds check fault", /* 11 T_BOUND */
124: "FPU not available fault", /* 12 T_DNA */
125: "double fault", /* 13 T_DOUBLEFLT */
126: "FPU operand fetch fault", /* 14 T_FPOPFLT */
127: "invalid TSS fault", /* 15 T_TSSFLT */
128: "segment not present fault", /* 16 T_SEGNPFLT */
129: "stack fault", /* 17 T_STKFLT */
130: "machine check", /* 18 T_MCA */
131: "SSE FP exception", /* 19 T_XMM */
132: "reserved trap", /* 20 T_RESERVED */
133: };
134: int trap_types = sizeof trap_type / sizeof trap_type[0];
135:
136: #ifdef DEBUG
137: int trapdebug = 0;
138: #endif
139:
140: #define IDTVEC(name) __CONCAT(X, name)
141:
142: #ifdef TRAP_SIGDEBUG
143: static void frame_dump(struct trapframe *);
144: #endif
145:
146: /*
147: * trap(frame):
148: * Exception, fault, and trap interface to BSD kernel. This
149: * common code is called from assembly language IDT gate entry
150: * routines that prepare a suitable stack frame, and restore this
151: * frame after the exception has been processed. Note that the
152: * effect is as if the arguments were passed call by reference.
153: */
154: /*ARGSUSED*/
155: void
156: trap(struct trapframe frame)
157: {
158: struct proc *p = curproc;
159: int type = (int)frame.tf_trapno;
160: struct pcb *pcb;
161: extern char resume_iret[], IDTVEC(oosyscall)[];
162: #if 0
163: extern char resume_pop_ds[], resume_pop_es[];
164: #endif
165: struct trapframe *vframe;
166: void *resume;
167: caddr_t onfault;
168: int error;
169: uint64_t cr2;
170: union sigval sv;
171:
172: uvmexp.traps++;
173:
174: pcb = (p != NULL && p->p_addr != NULL) ? &p->p_addr->u_pcb : NULL;
175:
176: #ifdef DEBUG
177: if (trapdebug) {
178: printf("trap %d code %lx eip %lx cs %lx rflags %lx cr2 %lx "
179: "cpl %x\n",
180: type, frame.tf_err, frame.tf_rip, frame.tf_cs,
181: frame.tf_rflags, rcr2(), curcpu()->ci_ilevel);
182: printf("curproc %p\n", curproc);
183: if (curproc)
184: printf("pid %d\n", p->p_pid);
185: }
186: #endif
187:
188: if (!KERNELMODE(frame.tf_cs, frame.tf_rflags)) {
189: type |= T_USER;
190: p->p_md.md_regs = &frame;
191: }
192:
193: switch (type) {
194:
195: default:
196: we_re_toast:
197: #ifdef KGDB
198: if (kgdb_trap(type, &frame))
199: return;
200: else {
201: /*
202: * If this is a breakpoint, don't panic
203: * if we're not connected.
204: */
205: if (type == T_BPTFLT) {
206: printf("kgdb: ignored %s\n", trap_type[type]);
207: return;
208: }
209: }
210: #endif
211: #ifdef DDB
212: if (kdb_trap(type, 0, &frame))
213: return;
214: #endif
215: if (frame.tf_trapno < trap_types)
216: printf("fatal %s", trap_type[frame.tf_trapno]);
217: else
218: printf("unknown trap %ld", (u_long)frame.tf_trapno);
219: printf(" in %s mode\n", (type & T_USER) ? "user" : "supervisor");
220: printf("trap type %d code %lx rip %lx cs %lx rflags %lx cr2 "
221: " %lx cpl %x rsp %lx\n",
222: type, frame.tf_err, (u_long)frame.tf_rip, frame.tf_cs,
223: frame.tf_rflags, rcr2(), curcpu()->ci_ilevel, frame.tf_rsp);
224:
225: /* panic("trap"); */
226: boot(RB_HALT);
227: /*NOTREACHED*/
228:
229: case T_PROTFLT:
230: case T_SEGNPFLT:
231: case T_ALIGNFLT:
232: case T_TSSFLT:
233: if (p == NULL)
234: goto we_re_toast;
235: /* Check for copyin/copyout fault. */
236: if (pcb->pcb_onfault != 0) {
237: error = EFAULT;
238: copyfault:
239: frame.tf_rip = (u_int64_t)pcb->pcb_onfault;
240: frame.tf_rax = error;
241: return;
242: }
243:
244: /*
245: * Check for failure during return to user mode.
246: *
247: * XXXfvdl check for rex prefix?
248: *
249: * We do this by looking at the instruction we faulted on. The
250: * specific instructions we recognize only happen when
251: * returning from a trap, syscall, or interrupt.
252: *
253: * XXX
254: * The heuristic used here will currently fail for the case of
255: * one of the 2 pop instructions faulting when returning from a
256: * a fast interrupt. This should not be possible. It can be
257: * fixed by rearranging the trap frame so that the stack format
258: * at this point is the same as on exit from a `slow'
259: * interrupt.
260: */
261: switch (*(u_char *)frame.tf_rip) {
262: case 0xcf: /* iret */
263: vframe = (void *)((u_int64_t)&frame.tf_rsp - 44);
264: resume = resume_iret;
265: break;
266: /*
267: * XXXfvdl these are illegal in long mode (not in compat mode, though)
268: * and we do not take back the descriptors from the signal context anyway,
269: * but may do so later for USER_LDT, in which case we need to intercept
270: * other instructions (movl %eax, %Xs).
271: */
272: #if 0
273: case 0x1f: /* popl %ds */
274: vframe = (void *)((u_int64_t)&frame.tf_rsp - 4);
275: resume = resume_pop_ds;
276: break;
277: case 0x07: /* popl %es */
278: vframe = (void *)((u_int64_t)&frame.tf_rsp - 0);
279: resume = resume_pop_es;
280: break;
281: #endif
282: default:
283: goto we_re_toast;
284: }
285: if (KERNELMODE(vframe->tf_cs, vframe->tf_rflags))
286: goto we_re_toast;
287:
288: frame.tf_rip = (u_int64_t)resume;
289: return;
290:
291: case T_PROTFLT|T_USER: /* protection fault */
292: case T_TSSFLT|T_USER:
293: case T_SEGNPFLT|T_USER:
294: case T_STKFLT|T_USER:
295: case T_NMI|T_USER:
296: #ifdef TRAP_SIGDEBUG
297: printf("pid %d (%s): BUS at rip %lx addr %lx\n",
298: p->p_pid, p->p_comm, frame.tf_rip, rcr2());
299: frame_dump(&frame);
300: #endif
301: sv.sival_ptr = (void *)frame.tf_rip;
302: KERNEL_PROC_LOCK(p);
303: trapsignal(p, SIGBUS, type & ~T_USER, BUS_OBJERR, sv);
304: KERNEL_PROC_UNLOCK(p);
305: goto out;
306: case T_ALIGNFLT|T_USER:
307: sv.sival_ptr = (void *)frame.tf_rip;
308: KERNEL_PROC_LOCK(p);
309: trapsignal(p, SIGBUS, type & ~T_USER, BUS_ADRALN, sv);
310: KERNEL_PROC_UNLOCK(p);
311: goto out;
312:
313: case T_PRIVINFLT|T_USER: /* privileged instruction fault */
314: sv.sival_ptr = (void *)frame.tf_rip;
315: KERNEL_PROC_LOCK(p);
316: trapsignal(p, SIGILL, type & ~T_USER, ILL_PRVOPC, sv);
317: KERNEL_PROC_UNLOCK(p);
318: goto out;
319: case T_FPOPFLT|T_USER: /* coprocessor operand fault */
320: #ifdef TRAP_SIGDEBUG
321: printf("pid %d (%s): ILL at rip %lx addr %lx\n",
322: p->p_pid, p->p_comm, frame.tf_rip, rcr2());
323: frame_dump(&frame);
324: #endif
325: sv.sival_ptr = (void *)frame.tf_rip;
326: KERNEL_PROC_LOCK(p);
327: trapsignal(p, SIGILL, type & ~T_USER, ILL_COPROC, sv);
328: KERNEL_PROC_UNLOCK(p);
329: goto out;
330:
331: case T_ASTFLT|T_USER: /* Allow process switch */
332: uvmexp.softs++;
333: if (p->p_flag & P_OWEUPC) {
334: KERNEL_PROC_LOCK(p);
335: ADDUPROF(p);
336: KERNEL_PROC_UNLOCK(p);
337: }
338: /* Allow a forced task switch. */
339: if (curcpu()->ci_want_resched)
340: preempt(NULL);
341: goto out;
342:
343: case T_BOUND|T_USER:
344: sv.sival_ptr = (void *)frame.tf_rip;
345: KERNEL_PROC_LOCK(p);
346: trapsignal(p, SIGFPE, type &~ T_USER, FPE_FLTSUB, sv);
347: KERNEL_PROC_UNLOCK(p);
348: goto out;
349: case T_OFLOW|T_USER:
350: sv.sival_ptr = (void *)frame.tf_rip;
351: KERNEL_PROC_LOCK(p);
352: trapsignal(p, SIGFPE, type &~ T_USER, FPE_INTOVF, sv);
353: KERNEL_PROC_UNLOCK(p);
354: goto out;
355: case T_DIVIDE|T_USER:
356: sv.sival_ptr = (void *)frame.tf_rip;
357: KERNEL_PROC_LOCK(p);
358: trapsignal(p, SIGFPE, type &~ T_USER, FPE_INTDIV, sv);
359: KERNEL_PROC_UNLOCK(p);
360: goto out;
361:
362: case T_ARITHTRAP|T_USER:
363: case T_XMM|T_USER:
364: fputrap(&frame);
365: goto out;
366:
367: case T_PAGEFLT: /* allow page faults in kernel mode */
368: if (p == NULL)
369: goto we_re_toast;
370: #ifdef MULTIPROCESSOR
371: if ((p->p_flag & P_BIGLOCK) == 0)
372: goto we_re_toast;
373: #endif
374: cr2 = rcr2();
375: KERNEL_LOCK();
376: goto faultcommon;
377:
378: case T_PAGEFLT|T_USER: { /* page fault */
379: vaddr_t va, fa;
380: struct vmspace *vm;
381: struct vm_map *map;
382: vm_prot_t ftype;
383: extern struct vm_map *kernel_map;
384:
385: cr2 = rcr2();
386: KERNEL_PROC_LOCK(p);
387: faultcommon:
388: vm = p->p_vmspace;
389: if (vm == NULL)
390: goto we_re_toast;
391: fa = cr2;
392: va = trunc_page((vaddr_t)cr2);
393: /*
394: * It is only a kernel address space fault iff:
395: * 1. (type & T_USER) == 0 and
396: * 2. pcb_onfault not set or
397: * 3. pcb_onfault set but supervisor space fault
398: * The last can occur during an exec() copyin where the
399: * argument space is lazy-allocated.
400: */
401: if (type == T_PAGEFLT && va >= VM_MIN_KERNEL_ADDRESS)
402: map = kernel_map;
403: else
404: map = &vm->vm_map;
405: if (frame.tf_err & PGEX_W)
406: ftype = VM_PROT_WRITE;
407: else if (frame.tf_err & PGEX_I)
408: ftype = VM_PROT_EXECUTE;
409: else
410: ftype = VM_PROT_READ;
411:
412: #ifdef DIAGNOSTIC
413: if (map == kernel_map && va == 0) {
414: printf("trap: bad kernel access at %lx\n", va);
415: goto we_re_toast;
416: }
417: #endif
418:
419: /* Fault the original page in. */
420: onfault = pcb->pcb_onfault;
421: pcb->pcb_onfault = NULL;
422: error = uvm_fault(map, va, frame.tf_err & PGEX_P?
423: VM_FAULT_PROTECT : VM_FAULT_INVALID, ftype);
424: pcb->pcb_onfault = onfault;
425: if (error == 0) {
426: if (map != kernel_map)
427: uvm_grow(p, va);
428:
429: if (type == T_PAGEFLT) {
430: KERNEL_UNLOCK();
431: return;
432: }
433: KERNEL_PROC_UNLOCK(p);
434: goto out;
435: }
436: if (error == EACCES) {
437: error = EFAULT;
438: }
439:
440: if (type == T_PAGEFLT) {
441: if (pcb->pcb_onfault != 0) {
442: KERNEL_UNLOCK();
443: goto copyfault;
444: }
445: printf("uvm_fault(%p, 0x%lx, 0, %d) -> %x\n",
446: map, va, ftype, error);
447: goto we_re_toast;
448: }
449: if (error == ENOMEM) {
450: printf("UVM: pid %d (%s), uid %d killed: out of swap\n",
451: p->p_pid, p->p_comm,
452: p->p_cred && p->p_ucred ?
453: (int)p->p_ucred->cr_uid : -1);
454: sv.sival_ptr = (void *)fa;
455: trapsignal(p, SIGKILL, T_PAGEFLT, SEGV_MAPERR, sv);
456: } else {
457: #ifdef TRAP_SIGDEBUG
458: printf("pid %d (%s): SEGV at rip %lx addr %lx\n",
459: p->p_pid, p->p_comm, frame.tf_rip, va);
460: frame_dump(&frame);
461: #endif
462: sv.sival_ptr = (void *)fa;
463: trapsignal(p, SIGSEGV, T_PAGEFLT, SEGV_MAPERR, sv);
464: }
465: if (type == T_PAGEFLT)
466: KERNEL_UNLOCK();
467: else
468: KERNEL_PROC_UNLOCK(p);
469: break;
470: }
471:
472: case T_TRCTRAP:
473: /* Check whether they single-stepped into a lcall. */
474: if (frame.tf_rip == (int)IDTVEC(oosyscall))
475: return;
476: if (frame.tf_rip == (int)IDTVEC(oosyscall) + 1) {
477: frame.tf_rflags &= ~PSL_T;
478: return;
479: }
480: goto we_re_toast;
481:
482: case T_BPTFLT|T_USER: /* bpt instruction fault */
483: case T_TRCTRAP|T_USER: /* trace trap */
484: #ifdef MATH_EMULATE
485: trace:
486: #endif
487: KERNEL_PROC_LOCK(p);
488: trapsignal(p, SIGTRAP, type &~ T_USER, TRAP_BRKPT, sv);
489: KERNEL_PROC_UNLOCK(p);
490: break;
491:
492: #if NISA > 0
493: case T_NMI:
494: #if defined(KGDB) || defined(DDB)
495: /* NMI can be hooked up to a pushbutton for debugging */
496: printf ("NMI ... going to debugger\n");
497: #ifdef KGDB
498:
499: if (kgdb_trap(type, &frame))
500: return;
501: #endif
502: #ifdef DDB
503: if (kdb_trap(type, 0, &frame))
504: return;
505: #endif
506: #endif /* KGDB || DDB */
507: /* machine/parity/power fail/"kitchen sink" faults */
508:
509: if (x86_nmi() != 0)
510: goto we_re_toast;
511: else
512: return;
513: #endif /* NISA > 0 */
514: }
515:
516: if ((type & T_USER) == 0)
517: return;
518: out:
519: userret(p);
520: }
521:
522: #ifdef TRAP_SIGDEBUG
523: static void
524: frame_dump(struct trapframe *tf)
525: {
526: printf("rip %p rsp %p rfl %p\n",
527: (void *)tf->tf_rip, (void *)tf->tf_rsp, (void *)tf->tf_rflags);
528: printf("rdi %p rsi %p rdx %p\n",
529: (void *)tf->tf_rdi, (void *)tf->tf_rsi, (void *)tf->tf_rdx);
530: printf("rcx %p r8 %p r9 %p\n",
531: (void *)tf->tf_rcx, (void *)tf->tf_r8, (void *)tf->tf_r9);
532: printf("r10 %p r11 %p r12 %p\n",
533: (void *)tf->tf_r10, (void *)tf->tf_r11, (void *)tf->tf_r12);
534: printf("r13 %p r14 %p r15 %p\n",
535: (void *)tf->tf_r13, (void *)tf->tf_r14, (void *)tf->tf_r15);
536: printf("rbp %p rbx %p rax %p\n",
537: (void *)tf->tf_rbp, (void *)tf->tf_rbx, (void *)tf->tf_rax);
538: }
539: #endif
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