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_ktrace.h"
39 #include <sys/param.h>
44 #include <sys/mutex.h>
45 #include <sys/pioctl.h>
46 #include <sys/ptrace.h>
47 #include <sys/reboot.h>
48 #include <sys/syscall.h>
49 #include <sys/sysent.h>
50 #include <sys/systm.h>
52 #include <sys/signalvar.h>
54 #include <sys/ktrace.h>
56 #include <sys/vmmeter.h>
58 #include <security/audit/audit.h>
62 #include <vm/vm_extern.h>
63 #include <vm/vm_param.h>
64 #include <vm/vm_kern.h>
65 #include <vm/vm_map.h>
66 #include <vm/vm_page.h>
68 #include <machine/altivec.h>
69 #include <machine/cpu.h>
70 #include <machine/db_machdep.h>
71 #include <machine/fpu.h>
72 #include <machine/frame.h>
73 #include <machine/pcb.h>
74 #include <machine/pmap.h>
75 #include <machine/psl.h>
76 #include <machine/trap.h>
77 #include <machine/spr.h>
78 #include <machine/sr.h>
80 static void trap_fatal(struct trapframe *frame);
81 static void printtrap(u_int vector, struct trapframe *frame, int isfatal,
83 static int trap_pfault(struct trapframe *frame, int user);
84 static int fix_unaligned(struct thread *td, struct trapframe *frame);
85 static int handle_onfault(struct trapframe *frame);
86 static void syscall(struct trapframe *frame);
88 static __inline void setusr(u_int);
90 int setfault(faultbuf); /* defined in locore.S */
92 /* Why are these not defined in a header? */
93 int badaddr(void *, size_t);
94 int badaddr_read(void *, size_t, int *);
96 extern char *syscallnames[];
98 struct powerpc_exception {
103 static struct powerpc_exception powerpc_exceptions[] = {
104 { 0x0100, "system reset" },
105 { 0x0200, "machine check" },
106 { 0x0300, "data storage interrupt" },
107 { 0x0400, "instruction storage interrupt" },
108 { 0x0500, "external interrupt" },
109 { 0x0600, "alignment" },
110 { 0x0700, "program" },
111 { 0x0800, "floating-point unavailable" },
112 { 0x0900, "decrementer" },
113 { 0x0c00, "system call" },
115 { 0x0e00, "floating-point assist" },
116 { 0x0f00, "performance monitoring" },
117 { 0x0f20, "altivec unavailable" },
118 { 0x1000, "instruction tlb miss" },
119 { 0x1100, "data load tlb miss" },
120 { 0x1200, "data store tlb miss" },
121 { 0x1300, "instruction breakpoint" },
122 { 0x1400, "system management" },
123 { 0x1600, "altivec assist" },
124 { 0x1700, "thermal management" },
125 { 0x2000, "run mode/trace" },
130 trapname(u_int vector)
132 struct powerpc_exception *pe;
134 for (pe = powerpc_exceptions; pe->vector != 0x3000; pe++) {
135 if (pe->vector == vector)
143 trap(struct trapframe *frame)
151 PCPU_INC(cnt.v_trap);
153 td = PCPU_GET(curthread);
156 type = ucode = frame->exc;
158 user = frame->srr1 & PSL_PR;
160 CTR3(KTR_TRAP, "trap: %s type=%s (%s)", td->td_name,
161 trapname(type), user ? "user" : "kernel");
165 td->td_frame = frame;
166 if (td->td_ucred != p->p_ucred)
167 cred_update_thread(td);
169 /* User Mode Traps */
173 frame->srr1 &= ~PSL_SE;
179 sig = trap_pfault(frame, 1);
187 KASSERT((td->td_pcb->pcb_flags & PCB_FPU) != PCB_FPU,
188 ("FPU already enabled for thread"));
193 KASSERT((td->td_pcb->pcb_flags & PCB_VEC) != PCB_VEC,
194 ("Altivec already enabled for thread"));
199 printf("Vector assist exception!\n");
204 if (fix_unaligned(td, frame) != 0)
211 /* Identify the trap reason */
212 if (frame->srr1 & EXC_PGM_TRAP)
222 /* Kernel Mode Traps */
224 KASSERT(cold || td->td_ucred != NULL,
225 ("kernel trap doesn't have ucred"));
228 if (trap_pfault(frame, 0) == 0)
232 if (handle_onfault(frame))
242 if (td != PCPU_GET(vecthread) ||
243 td->td_pcb->pcb_veccpu != PCPU_GET(cpuid))
244 frame->srr1 &= ~PSL_VEC;
248 if (p->p_sysent->sv_transtrap != NULL)
249 sig = (p->p_sysent->sv_transtrap)(sig, type);
250 ksiginfo_init_trap(&ksi);
252 ksi.ksi_code = (int) ucode; /* XXX, not POSIX */
253 /* ksi.ksi_addr = ? */
254 ksi.ksi_trapno = type;
255 trapsignal(td, &ksi);
259 mtx_assert(&Giant, MA_NOTOWNED);
263 trap_fatal(struct trapframe *frame)
266 printtrap(frame->exc, frame, 1, (frame->srr1 & PSL_PR));
268 if ((debugger_on_panic || kdb_active) &&
269 kdb_trap(frame->exc, 0, frame))
272 panic("%s trap", trapname(frame->exc));
276 printtrap(u_int vector, struct trapframe *frame, int isfatal, int user)
280 printf("%s %s trap:\n", isfatal ? "fatal" : "handled",
281 user ? "user" : "kernel");
283 printf(" exception = 0x%x (%s)\n", vector >> 8,
287 printf(" virtual address = 0x%x\n", frame->cpu.aim.dar);
290 printf(" virtual address = 0x%x\n", frame->srr0);
293 printf(" srr0 = 0x%x\n", frame->srr0);
294 printf(" srr1 = 0x%x\n", frame->srr1);
295 printf(" lr = 0x%x\n", frame->lr);
296 printf(" curthread = %p\n", curthread);
297 if (curthread != NULL)
298 printf(" pid = %d, comm = %s\n",
299 curthread->td_proc->p_pid, curthread->td_name);
304 * Handles a fatal fault when we have onfault state to recover. Returns
305 * non-zero if there was onfault recovery state available.
308 handle_onfault(struct trapframe *frame)
314 fb = td->td_pcb->pcb_onfault;
316 frame->srr0 = (*fb)[0];
317 frame->fixreg[1] = (*fb)[1];
318 frame->fixreg[2] = (*fb)[2];
319 frame->fixreg[3] = 1;
320 frame->cr = (*fb)[3];
321 bcopy(&(*fb)[4], &frame->fixreg[13],
322 19 * sizeof(register_t));
329 syscall(struct trapframe *frame)
332 struct sysent *callp;
340 td = PCPU_GET(curthread);
343 PCPU_INC(cnt.v_syscall);
345 code = frame->fixreg[0];
346 params = (caddr_t)(frame->fixreg + FIRSTARG);
349 if (p->p_sysent->sv_prepsyscall) {
351 * The prep code is MP aware.
353 (*p->p_sysent->sv_prepsyscall)(frame, args, &code, ¶ms);
354 } else if (code == SYS_syscall) {
356 * code is first argument,
357 * followed by actual args.
359 code = *(u_int *) params;
360 params += sizeof(register_t);
362 } else if (code == SYS___syscall) {
364 * Like syscall, but code is a quad,
365 * so as to maintain quad alignment
366 * for the rest of the args.
368 params += sizeof(register_t);
369 code = *(u_int *) params;
370 params += sizeof(register_t);
374 if (p->p_sysent->sv_mask)
375 code &= p->p_sysent->sv_mask;
377 if (code >= p->p_sysent->sv_size)
378 callp = &p->p_sysent->sv_table[0];
380 callp = &p->p_sysent->sv_table[code];
382 narg = callp->sy_narg;
385 bcopy(params, args, n * sizeof(register_t));
386 error = copyin(MOREARGS(frame->fixreg[1]), args + n,
387 (narg - n) * sizeof(register_t));
388 params = (caddr_t)args;
392 CTR5(KTR_SYSC, "syscall: p=%s %s(%x %x %x)", td->td_name,
394 frame->fixreg[FIRSTARG],
395 frame->fixreg[FIRSTARG+1],
396 frame->fixreg[FIRSTARG+2]);
399 if (KTRPOINT(td, KTR_SYSCALL))
400 ktrsyscall(code, narg, (register_t *)params);
406 td->td_retval[0] = 0;
407 td->td_retval[1] = frame->fixreg[FIRSTARG + 1];
409 STOPEVENT(p, S_SCE, narg);
411 PTRACESTOP_SC(p, td, S_PT_SCE);
413 AUDIT_SYSCALL_ENTER(code, td);
414 error = (*callp->sy_call)(td, params);
415 AUDIT_SYSCALL_EXIT(error, td);
417 CTR3(KTR_SYSC, "syscall: p=%s %s ret=%x", td->td_name,
418 syscallnames[code], td->td_retval[0]);
422 if (frame->fixreg[0] == SYS___syscall &&
423 code != SYS_freebsd6_lseek && code != SYS_lseek) {
425 * 64-bit return, 32-bit syscall. Fixup byte order
427 frame->fixreg[FIRSTARG] = 0;
428 frame->fixreg[FIRSTARG + 1] = td->td_retval[0];
430 frame->fixreg[FIRSTARG] = td->td_retval[0];
431 frame->fixreg[FIRSTARG + 1] = td->td_retval[1];
433 /* XXX: Magic number */
434 frame->cr &= ~0x10000000;
438 * Set user's pc back to redo the system call.
446 if (p->p_sysent->sv_errsize) {
447 if (error >= p->p_sysent->sv_errsize)
448 error = -1; /* XXX */
450 error = p->p_sysent->sv_errtbl[error];
452 frame->fixreg[FIRSTARG] = error;
453 /* XXX: Magic number: Carry Flag Equivalent? */
454 frame->cr |= 0x10000000;
459 * Check for misbehavior.
461 WITNESS_WARN(WARN_PANIC, NULL, "System call %s returning",
462 (code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???");
463 KASSERT(td->td_critnest == 0,
464 ("System call %s returning in a critical section",
465 (code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???"));
466 KASSERT(td->td_locks == 0,
467 ("System call %s returning with %d locks held",
468 (code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???",
472 if (KTRPOINT(td, KTR_SYSRET))
473 ktrsysret(code, error, td->td_retval[0]);
477 * Does the comment in the i386 code about errno apply here?
479 STOPEVENT(p, S_SCX, code);
481 PTRACESTOP_SC(p, td, S_PT_SCX);
485 trap_pfault(struct trapframe *frame, int user)
497 if (frame->exc == EXC_ISI) {
499 ftype = VM_PROT_READ | VM_PROT_EXECUTE;
501 eva = frame->cpu.aim.dar;
502 if (frame->cpu.aim.dsisr & DSISR_STORE)
503 ftype = VM_PROT_WRITE;
505 ftype = VM_PROT_READ;
509 map = &p->p_vmspace->vm_map;
511 if ((eva >> ADDR_SR_SHFT) == USER_SR) {
512 if (p->p_vmspace == NULL)
518 eva &= ADDR_PIDX | ADDR_POFF;
519 eva |= user_sr << ADDR_SR_SHFT;
520 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
546 * Don't have to worry about process locking or stacks in the
549 rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL);
552 if (rv == KERN_SUCCESS)
555 if (!user && handle_onfault(frame))
562 setusr(u_int content)
564 __asm __volatile ("isync; mtsr %0,%1; isync"
565 :: "n"(USER_SR), "r"(content));
569 badaddr(void *addr, size_t size)
571 return (badaddr_read(addr, size, NULL));
575 badaddr_read(void *addr, size_t size, int *rptr)
581 /* Get rid of any stale machine checks that have been waiting. */
582 __asm __volatile ("sync; isync");
584 td = PCPU_GET(curthread);
587 td->td_pcb->pcb_onfault = 0;
588 __asm __volatile ("sync");
592 __asm __volatile ("sync");
596 x = *(volatile int8_t *)addr;
599 x = *(volatile int16_t *)addr;
602 x = *(volatile int32_t *)addr;
605 panic("badaddr: invalid size (%d)", size);
608 /* Make sure we took the machine check, if we caused one. */
609 __asm __volatile ("sync; isync");
611 td->td_pcb->pcb_onfault = 0;
612 __asm __volatile ("sync"); /* To be sure. */
614 /* Use the value to avoid reorder. */
622 * For now, this only deals with the particular unaligned access case
623 * that gcc tends to generate. Eventually it should handle all of the
624 * possibilities that can happen on a 32-bit PowerPC in big-endian mode.
628 fix_unaligned(struct thread *td, struct trapframe *frame)
630 struct thread *fputhread;
634 indicator = EXC_ALI_OPCODE_INDICATOR(frame->cpu.aim.dsisr);
639 reg = EXC_ALI_RST(frame->cpu.aim.dsisr);
640 fpr = &td->td_pcb->pcb_fpu.fpr[reg];
641 fputhread = PCPU_GET(fputhread);
643 /* Juggle the FPU to ensure that we've initialized
644 * the FPRs, and that their current state is in
647 if (fputhread != td) {
654 if (indicator == EXC_ALI_LFD) {
655 if (copyin((void *)frame->cpu.aim.dar, fpr,
656 sizeof(double)) != 0)
660 if (copyout(fpr, (void *)frame->cpu.aim.dar,
661 sizeof(double)) != 0)