2 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
3 * Copyright (C) 1995, 1996 TooLs GmbH.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by TooLs GmbH.
17 * 4. The name of TooLs GmbH may not be used to endorse or promote products
18 * derived from this software without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 * $NetBSD: trap.c,v 1.58 2002/03/04 04:07:35 dbj Exp $
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include "opt_fpu_emu.h"
38 #include "opt_ktrace.h"
40 #include <sys/param.h>
45 #include <sys/mutex.h>
46 #include <sys/pioctl.h>
47 #include <sys/ptrace.h>
48 #include <sys/reboot.h>
49 #include <sys/syscall.h>
50 #include <sys/sysent.h>
51 #include <sys/systm.h>
53 #include <sys/signalvar.h>
55 #include <sys/ktrace.h>
57 #include <sys/vmmeter.h>
59 #include <security/audit/audit.h>
63 #include <vm/vm_extern.h>
64 #include <vm/vm_param.h>
65 #include <vm/vm_kern.h>
66 #include <vm/vm_map.h>
67 #include <vm/vm_page.h>
69 #include <machine/cpu.h>
70 #include <machine/db_machdep.h>
71 #include <machine/frame.h>
72 #include <machine/pcb.h>
73 #include <machine/pmap.h>
74 #include <machine/psl.h>
75 #include <machine/trap.h>
76 #include <machine/spr.h>
79 #include <powerpc/fpu/fpu_extern.h>
86 #define FAULTBUF_CTR 4
87 #define FAULTBUF_XER 5
88 #define FAULTBUF_R13 6
90 static void trap_fatal(struct trapframe *frame);
91 static void printtrap(u_int vector, struct trapframe *frame, int isfatal,
93 static int trap_pfault(struct trapframe *frame, int user);
94 static int fix_unaligned(struct thread *td, struct trapframe *frame);
95 static int handle_onfault(struct trapframe *frame);
96 static void syscall(struct trapframe *frame);
98 int setfault(faultbuf); /* defined in locore.S */
100 /* Why are these not defined in a header? */
101 int badaddr(void *, size_t);
102 int badaddr_read(void *, size_t, int *);
104 extern char *syscallnames[];
106 extern char interrupt_vector_base[];
107 extern char interrupt_vector_top[];
109 struct powerpc_exception {
114 static struct powerpc_exception powerpc_exceptions[] = {
115 { EXC_CRIT, "critical input" },
116 { EXC_MCHK, "machine check" },
117 { EXC_DSI, "data storage interrupt" },
118 { EXC_ISI, "instruction storage interrupt" },
119 { EXC_EXI, "external interrupt" },
120 { EXC_ALI, "alignment" },
121 { EXC_PGM, "program" },
122 { EXC_SC, "system call" },
123 { EXC_APU, "auxiliary proc unavailable" },
124 { EXC_DECR, "decrementer" },
125 { EXC_FIT, "fixed-interval timer" },
126 { EXC_WDOG, "watchdog timer" },
127 { EXC_DTMISS, "data tlb miss" },
128 { EXC_ITMISS, "instruction tlb miss" },
129 { EXC_DEBUG, "debug" },
130 { EXC_PERF, "performance monitoring" },
135 trapname(u_int vector)
137 struct powerpc_exception *pe;
139 for (pe = powerpc_exceptions; pe->vector != EXC_LAST; pe++) {
140 if (pe->vector == vector)
148 trap(struct trapframe *frame)
155 PCPU_INC(cnt.v_trap);
157 td = PCPU_GET(curthread);
162 user = (frame->srr1 & PSL_PR) ? 1 : 0;
164 CTR3(KTR_TRAP, "trap: %s type=%s (%s)", p->p_comm,
165 trapname(type), user ? "user" : "kernel");
168 td->td_frame = frame;
169 if (td->td_ucred != p->p_ucred)
170 cred_update_thread(td);
172 /* User Mode Traps */
176 sig = trap_pfault(frame, 1);
184 if (fix_unaligned(td, frame) != 0)
190 case EXC_DEBUG: /* Single stepping */
191 mtspr(SPR_DBSR, mfspr(SPR_DBSR));
192 frame->srr1 &= ~PSL_DE;
196 case EXC_PGM: /* Program exception */
198 sig = fpu_emulate(frame,
199 (struct fpreg *)&td->td_pcb->pcb_fpu);
201 /* XXX SIGILL for non-trap instructions. */
210 /* Kernel Mode Traps */
211 KASSERT(cold || td->td_ucred != NULL,
212 ("kernel trap doesn't have ucred"));
216 mtspr(SPR_DBSR, mfspr(SPR_DBSR));
217 kdb_trap(frame->exc, 0, frame);
221 if (trap_pfault(frame, 0) == 0)
226 if (handle_onfault(frame))
231 if (frame->cpu.booke.esr & ESR_PTR)
232 kdb_trap(EXC_PGM, 0, frame);
242 if (p->p_sysent->sv_transtrap != NULL)
243 sig = (p->p_sysent->sv_transtrap)(sig, type);
244 ksiginfo_init_trap(&ksi);
246 ksi.ksi_code = type; /* XXX, not POSIX */
247 /* ksi.ksi_addr = ? */
248 ksi.ksi_trapno = type;
249 trapsignal(td, &ksi);
253 mtx_assert(&Giant, MA_NOTOWNED);
257 trap_fatal(struct trapframe *frame)
260 printtrap(frame->exc, frame, 1, (frame->srr1 & PSL_PR));
262 if ((debugger_on_panic || kdb_active) &&
263 kdb_trap(frame->exc, 0, frame))
266 panic("%s trap", trapname(frame->exc));
270 printtrap(u_int vector, struct trapframe *frame, int isfatal, int user)
275 printf("%s %s trap:\n", isfatal ? "fatal" : "handled",
276 user ? "user" : "kernel");
278 printf(" exception = 0x%x (%s)\n", vector, trapname(vector));
283 va = frame->cpu.booke.dear;
292 printf(" virtual address = 0x%08x\n", va);
293 printf(" srr0 = 0x%08x\n", frame->srr0);
294 printf(" srr1 = 0x%08x\n", frame->srr1);
295 printf(" curthread = %p\n", curthread);
296 if (curthread != NULL)
297 printf(" pid = %d, comm = %s\n",
298 curthread->td_proc->p_pid, curthread->td_proc->p_comm);
303 * Handles a fatal fault when we have onfault state to recover. Returns
304 * non-zero if there was onfault recovery state available.
307 handle_onfault(struct trapframe *frame)
313 fb = td->td_pcb->pcb_onfault;
315 frame->srr0 = (*fb)[FAULTBUF_LR];
316 frame->fixreg[1] = (*fb)[FAULTBUF_R1];
317 frame->fixreg[2] = (*fb)[FAULTBUF_R2];
318 frame->fixreg[3] = 1;
319 frame->cr = (*fb)[FAULTBUF_CR];
320 frame->ctr = (*fb)[FAULTBUF_CTR];
321 frame->xer = (*fb)[FAULTBUF_XER];
322 bcopy(&(*fb)[FAULTBUF_R13], &frame->fixreg[13],
323 19 * sizeof(register_t));
330 syscall(struct trapframe *frame)
333 struct sysent *callp;
341 td = PCPU_GET(curthread);
344 PCPU_INC(cnt.v_syscall);
346 code = frame->fixreg[0];
347 params = (caddr_t)(frame->fixreg + FIRSTARG);
350 if (p->p_sysent->sv_prepsyscall) {
352 * The prep code is MP aware.
354 (*p->p_sysent->sv_prepsyscall)(frame, args, &code, ¶ms);
355 } else if (code == SYS_syscall) {
357 * code is first argument,
358 * followed by actual args.
360 code = *(u_int *) params;
361 params += sizeof(register_t);
363 } else if (code == SYS___syscall) {
365 * Like syscall, but code is a quad,
366 * so as to maintain quad alignment
367 * for the rest of the args.
369 params += sizeof(register_t);
370 code = *(u_int *) params;
371 params += sizeof(register_t);
375 if (p->p_sysent->sv_mask)
376 code &= p->p_sysent->sv_mask;
378 if (code >= p->p_sysent->sv_size)
379 callp = &p->p_sysent->sv_table[0];
381 callp = &p->p_sysent->sv_table[code];
383 narg = callp->sy_narg;
386 bcopy(params, args, n * sizeof(register_t));
387 error = copyin(MOREARGS(frame->fixreg[1]), args + n,
388 (narg - n) * sizeof(register_t));
389 params = (caddr_t)args;
393 CTR5(KTR_SYSC, "syscall: p=%s %s(%x %x %x)", p->p_comm,
395 frame->fixreg[FIRSTARG],
396 frame->fixreg[FIRSTARG+1],
397 frame->fixreg[FIRSTARG+2]);
400 if (KTRPOINT(td, KTR_SYSCALL))
401 ktrsyscall(code, narg, (register_t *)params);
407 td->td_retval[0] = 0;
408 td->td_retval[1] = frame->fixreg[FIRSTARG + 1];
410 STOPEVENT(p, S_SCE, narg);
412 PTRACESTOP_SC(p, td, S_PT_SCE);
414 AUDIT_SYSCALL_ENTER(code, td);
415 error = (*callp->sy_call)(td, params);
416 AUDIT_SYSCALL_EXIT(error, td);
418 CTR3(KTR_SYSC, "syscall: p=%s %s ret=%x", p->p_comm,
419 syscallnames[code], td->td_retval[0]);
424 if (frame->fixreg[0] == SYS___syscall && SYS_lseek) {
426 * 64-bit return, 32-bit syscall. Fixup byte order
428 frame->fixreg[FIRSTARG] = 0;
429 frame->fixreg[FIRSTARG + 1] = td->td_retval[0];
431 frame->fixreg[FIRSTARG] = td->td_retval[0];
432 frame->fixreg[FIRSTARG + 1] = td->td_retval[1];
434 /* XXX: Magic number */
435 frame->cr &= ~0x10000000;
439 * Set user's pc back to redo the system call.
447 if (p->p_sysent->sv_errsize) {
448 if (error >= p->p_sysent->sv_errsize)
449 error = -1; /* XXX */
451 error = p->p_sysent->sv_errtbl[error];
453 frame->fixreg[FIRSTARG] = error;
454 /* XXX: Magic number: Carry Flag Equivalent? */
455 frame->cr |= 0x10000000;
460 * Check for misbehavior.
462 WITNESS_WARN(WARN_PANIC, NULL, "System call %s returning",
463 (code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???");
464 KASSERT(td->td_critnest == 0,
465 ("System call %s returning in a critical section",
466 (code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???"));
467 KASSERT(td->td_locks == 0,
468 ("System call %s returning with %d locks held",
469 (code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???",
473 if (KTRPOINT(td, KTR_SYSRET))
474 ktrsysret(code, error, td->td_retval[0]);
478 * Does the comment in the i386 code about errno apply here?
480 STOPEVENT(p, S_SCX, code);
482 PTRACESTOP_SC(p, td, S_PT_SCX);
486 trap_pfault(struct trapframe *frame, int user)
498 if (frame->exc == EXC_ISI) {
500 ftype = VM_PROT_READ | VM_PROT_EXECUTE;
503 eva = frame->cpu.booke.dear;
504 if (frame->cpu.booke.esr & ESR_ST)
505 ftype = VM_PROT_WRITE;
507 ftype = VM_PROT_READ;
511 KASSERT(p->p_vmspace != NULL, ("trap_pfault: vmspace NULL"));
512 map = &p->p_vmspace->vm_map;
514 if (eva < VM_MAXUSER_ADDRESS) {
516 if (p->p_vmspace == NULL)
519 map = &p->p_vmspace->vm_map;
525 va = trunc_page(eva);
527 if (map != kernel_map) {
529 * Keep swapout from messing with us during this
536 /* Fault in the user page: */
537 rv = vm_fault(map, va, ftype,
538 (ftype & VM_PROT_WRITE) ? VM_FAULT_DIRTY : VM_FAULT_NORMAL);
545 * Don't have to worry about process locking or stacks in the
548 rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL);
551 if (rv == KERN_SUCCESS)
554 if (!user && handle_onfault(frame))
557 return ((rv == KERN_PROTECTION_FAILURE) ? SIGBUS : SIGSEGV);
561 badaddr(void *addr, size_t size)
564 return (badaddr_read(addr, size, NULL));
568 badaddr_read(void *addr, size_t size, int *rptr)
574 /* Get rid of any stale machine checks that have been waiting. */
575 __asm __volatile ("sync; isync");
577 td = PCPU_GET(curthread);
580 td->td_pcb->pcb_onfault = 0;
581 __asm __volatile ("sync");
585 __asm __volatile ("sync");
589 x = *(volatile int8_t *)addr;
592 x = *(volatile int16_t *)addr;
595 x = *(volatile int32_t *)addr;
598 panic("badaddr: invalid size (%d)", size);
601 /* Make sure we took the machine check, if we caused one. */
602 __asm __volatile ("sync; isync");
604 td->td_pcb->pcb_onfault = 0;
605 __asm __volatile ("sync"); /* To be sure. */
607 /* Use the value to avoid reorder. */
615 * For now, this only deals with the particular unaligned access case
616 * that gcc tends to generate. Eventually it should handle all of the
617 * possibilities that can happen on a 32-bit PowerPC in big-endian mode.
621 fix_unaligned(struct thread *td, struct trapframe *frame)
624 struct thread *fputhread;
628 indicator = EXC_ALI_OPCODE_INDICATOR(frame->dsisr);
633 reg = EXC_ALI_RST(frame->dsisr);
634 fpr = &td->td_pcb->pcb_fpu.fpr[reg];
635 fputhread = PCPU_GET(fputhread);
636 /* Juggle the FPU to ensure that we've initialized
637 * the FPRs, and that their current state is in
640 if (fputhread != td) {
647 if (indicator == EXC_ALI_LFD) {
648 if (copyin((void *)frame->dar, fpr,
649 sizeof(double)) != 0)
653 if (copyout(fpr, (void *)frame->dar,
654 sizeof(double)) != 0)
666 int db_trap_glue(struct trapframe *);
668 db_trap_glue(struct trapframe *tf)
670 if (!(tf->srr1 & PSL_PR))
671 return (kdb_trap(tf->exc, 0, tf));