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 <sys/param.h>
42 #include <sys/mutex.h>
43 #include <sys/pioctl.h>
44 #include <sys/ptrace.h>
45 #include <sys/reboot.h>
46 #include <sys/syscall.h>
47 #include <sys/sysent.h>
48 #include <sys/systm.h>
49 #include <sys/kernel.h>
51 #include <sys/signalvar.h>
52 #include <sys/vmmeter.h>
54 #include <security/audit/audit.h>
58 #include <vm/vm_extern.h>
59 #include <vm/vm_param.h>
60 #include <vm/vm_kern.h>
61 #include <vm/vm_map.h>
62 #include <vm/vm_page.h>
64 #include <machine/_inttypes.h>
65 #include <machine/altivec.h>
66 #include <machine/cpu.h>
67 #include <machine/db_machdep.h>
68 #include <machine/fpu.h>
69 #include <machine/frame.h>
70 #include <machine/pcb.h>
71 #include <machine/psl.h>
72 #include <machine/trap.h>
73 #include <machine/spr.h>
74 #include <machine/sr.h>
76 /* Below matches setjmp.S */
77 #define FAULTBUF_LR 21
80 #define FAULTBUF_CR 22
81 #define FAULTBUF_R14 3
83 static void trap_fatal(struct trapframe *frame);
84 static void printtrap(u_int vector, struct trapframe *frame, int isfatal,
86 static int trap_pfault(struct trapframe *frame, int user);
87 static int fix_unaligned(struct thread *td, struct trapframe *frame);
88 static int handle_onfault(struct trapframe *frame);
89 static void syscall(struct trapframe *frame);
92 void handle_kernel_slb_spill(int, register_t, register_t);
93 static int handle_user_slb_spill(pmap_t pm, vm_offset_t addr);
97 struct powerpc_exception {
103 #include <sys/dtrace_bsd.h>
105 int (*dtrace_invop_jump_addr)(struct trapframe *);
108 static struct powerpc_exception powerpc_exceptions[] = {
109 { EXC_CRIT, "critical input" },
110 { EXC_RST, "system reset" },
111 { EXC_MCHK, "machine check" },
112 { EXC_DSI, "data storage interrupt" },
113 { EXC_DSE, "data segment exception" },
114 { EXC_ISI, "instruction storage interrupt" },
115 { EXC_ISE, "instruction segment exception" },
116 { EXC_EXI, "external interrupt" },
117 { EXC_ALI, "alignment" },
118 { EXC_PGM, "program" },
119 { EXC_FPU, "floating-point unavailable" },
120 { EXC_APU, "auxiliary proc unavailable" },
121 { EXC_DECR, "decrementer" },
122 { EXC_FIT, "fixed-interval timer" },
123 { EXC_WDOG, "watchdog timer" },
124 { EXC_SC, "system call" },
125 { EXC_TRC, "trace" },
126 { EXC_FPA, "floating-point assist" },
127 { EXC_DEBUG, "debug" },
128 { EXC_PERF, "performance monitoring" },
129 { EXC_VEC, "altivec unavailable" },
130 { EXC_VSX, "vsx unavailable" },
131 { EXC_ITMISS, "instruction tlb miss" },
132 { EXC_DLMISS, "data load tlb miss" },
133 { EXC_DSMISS, "data store tlb miss" },
134 { EXC_BPT, "instruction breakpoint" },
135 { EXC_SMI, "system management" },
136 { EXC_VECAST_G4, "altivec assist" },
137 { EXC_THRM, "thermal management" },
138 { EXC_RUNMODETRC, "run mode/trace" },
143 trapname(u_int vector)
145 struct powerpc_exception *pe;
147 for (pe = powerpc_exceptions; pe->vector != EXC_LAST; pe++) {
148 if (pe->vector == vector)
156 trap(struct trapframe *frame)
167 PCPU_INC(cnt.v_trap);
172 type = ucode = frame->exc;
174 user = frame->srr1 & PSL_PR;
176 CTR3(KTR_TRAP, "trap: %s type=%s (%s)", td->td_name,
177 trapname(type), user ? "user" : "kernel");
181 * A trap can occur while DTrace executes a probe. Before
182 * executing the probe, DTrace blocks re-scheduling and sets
183 * a flag in its per-cpu flags to indicate that it doesn't
184 * want to fault. On returning from the probe, the no-fault
185 * flag is cleared and finally re-scheduling is enabled.
187 * If the DTrace kernel module has registered a trap handler,
188 * call it and if it returns non-zero, assume that it has
189 * handled the trap and modified the trap frame so that this
190 * function can return normally.
192 if (dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, type) != 0)
198 td->td_frame = frame;
199 if (td->td_cowgen != p->p_cowgen)
200 thread_cow_update(td);
202 /* User Mode Traps */
206 frame->srr1 &= ~PSL_SE;
214 if (handle_user_slb_spill(&p->p_vmspace->vm_pmap,
215 (type == EXC_ISE) ? frame->srr0 : frame->dar) != 0){
223 sig = trap_pfault(frame, 1);
233 KASSERT((td->td_pcb->pcb_flags & PCB_FPU) != PCB_FPU,
234 ("FPU already enabled for thread"));
239 KASSERT((td->td_pcb->pcb_flags & PCB_VEC) != PCB_VEC,
240 ("Altivec already enabled for thread"));
245 KASSERT((td->td_pcb->pcb_flags & PCB_VSX) != PCB_VSX,
246 ("VSX already enabled for thread"));
247 if (!(td->td_pcb->pcb_flags & PCB_VEC))
249 if (!(td->td_pcb->pcb_flags & PCB_FPU))
251 td->td_pcb->pcb_flags |= PCB_VSX;
259 * We get a VPU assist exception for IEEE mode
260 * vector operations on denormalized floats.
261 * Emulating this is a giant pain, so for now,
262 * just switch off IEEE mode and treat them as
267 td->td_pcb->pcb_vec.vscr |= ALTIVEC_VSCR_NJ;
272 if (fix_unaligned(td, frame) != 0) {
280 case EXC_DEBUG: /* Single stepping */
281 mtspr(SPR_DBSR, mfspr(SPR_DBSR));
282 frame->srr1 &= ~PSL_DE;
283 frame->cpu.booke.dbcr0 &= ~(DBCR0_IDM || DBCR0_IC);
289 /* Identify the trap reason */
291 if (frame->srr1 & EXC_PGM_TRAP) {
293 if (frame->cpu.booke.esr & ESR_PTR) {
296 inst = fuword32((const void *)frame->srr0);
297 if (inst == 0x0FFFDDDD &&
298 dtrace_pid_probe_ptr != NULL) {
300 fill_regs(td, ®s);
301 (*dtrace_pid_probe_ptr)(®s);
308 sig = ppc_instr_emulate(frame, td->td_pcb);
310 if (frame->srr1 & EXC_PGM_PRIV)
312 else if (frame->srr1 & EXC_PGM_ILLEGAL)
314 } else if (sig == SIGFPE)
315 ucode = FPE_FLTINV; /* Punt for now, invalid operation. */
321 * Note that this may not be recoverable for the user
322 * process, depending on the type of machine check,
323 * but it at least prevents the kernel from dying.
333 /* Kernel Mode Traps */
335 KASSERT(cold || td->td_ucred != NULL,
336 ("kernel trap doesn't have ucred"));
340 if (frame->srr1 & EXC_PGM_TRAP) {
341 if (*(uint32_t *)frame->srr0 == EXC_DTRACE) {
342 if (dtrace_invop_jump_addr != NULL) {
343 dtrace_invop_jump_addr(frame);
352 if ((frame->dar & SEGMENT_MASK) == USER_ADDR) {
353 __asm __volatile ("slbmte %0, %1" ::
354 "r"(td->td_pcb->pcb_cpu.aim.usr_vsid),
361 if (trap_pfault(frame, 0) == 0)
365 if (handle_onfault(frame))
375 if (p->p_sysent->sv_transtrap != NULL)
376 sig = (p->p_sysent->sv_transtrap)(sig, type);
377 ksiginfo_init_trap(&ksi);
379 ksi.ksi_code = (int) ucode; /* XXX, not POSIX */
380 /* ksi.ksi_addr = ? */
381 ksi.ksi_trapno = type;
382 trapsignal(td, &ksi);
389 trap_fatal(struct trapframe *frame)
392 printtrap(frame->exc, frame, 1, (frame->srr1 & PSL_PR));
394 if ((debugger_on_panic || kdb_active) &&
395 kdb_trap(frame->exc, 0, frame))
398 panic("%s trap", trapname(frame->exc));
402 printtrap(u_int vector, struct trapframe *frame, int isfatal, int user)
410 printf("%s %s trap:\n", isfatal ? "fatal" : "handled",
411 user ? "user" : "kernel");
413 printf(" exception = 0x%x (%s)\n", vector, trapname(vector));
418 printf(" virtual address = 0x%" PRIxPTR "\n", frame->dar);
420 printf(" dsisr = 0x%lx\n",
421 (u_long)frame->cpu.aim.dsisr);
427 printf(" virtual address = 0x%" PRIxPTR "\n", frame->srr0);
433 printf(" msssr0 = 0x%lx\n",
434 (u_long)mfspr(SPR_MSSSR0));
436 pa = mfspr(SPR_MCARU);
437 pa = (pa << 32) | (u_register_t)mfspr(SPR_MCAR);
438 printf(" mcsr = 0x%lx\n", (u_long)mfspr(SPR_MCSR));
439 printf(" mcar = 0x%jx\n", (uintmax_t)pa);
444 printf(" esr = 0x%" PRIxPTR "\n",
445 frame->cpu.booke.esr);
447 printf(" srr0 = 0x%" PRIxPTR "\n", frame->srr0);
448 printf(" srr1 = 0x%lx\n", (u_long)frame->srr1);
449 printf(" lr = 0x%" PRIxPTR "\n", frame->lr);
450 printf(" curthread = %p\n", curthread);
451 if (curthread != NULL)
452 printf(" pid = %d, comm = %s\n",
453 curthread->td_proc->p_pid, curthread->td_name);
458 * Handles a fatal fault when we have onfault state to recover. Returns
459 * non-zero if there was onfault recovery state available.
462 handle_onfault(struct trapframe *frame)
468 fb = td->td_pcb->pcb_onfault;
470 frame->srr0 = (*fb)->_jb[FAULTBUF_LR];
471 frame->fixreg[1] = (*fb)->_jb[FAULTBUF_R1];
472 frame->fixreg[2] = (*fb)->_jb[FAULTBUF_R2];
473 frame->fixreg[3] = 1;
474 frame->cr = (*fb)->_jb[FAULTBUF_CR];
475 bcopy(&(*fb)->_jb[FAULTBUF_R14], &frame->fixreg[14],
476 18 * sizeof(register_t));
477 td->td_pcb->pcb_onfault = NULL; /* Returns twice, not thrice */
484 cpu_fetch_syscall_args(struct thread *td, struct syscall_args *sa)
487 struct trapframe *frame;
493 frame = td->td_frame;
495 sa->code = frame->fixreg[0];
496 params = (caddr_t)(frame->fixreg + FIRSTARG);
499 if (sa->code == SYS_syscall) {
501 * code is first argument,
502 * followed by actual args.
504 sa->code = *(register_t *) params;
505 params += sizeof(register_t);
507 } else if (sa->code == SYS___syscall) {
509 * Like syscall, but code is a quad,
510 * so as to maintain quad alignment
511 * for the rest of the args.
513 if (SV_PROC_FLAG(p, SV_ILP32)) {
514 params += sizeof(register_t);
515 sa->code = *(register_t *) params;
516 params += sizeof(register_t);
519 sa->code = *(register_t *) params;
520 params += sizeof(register_t);
525 if (p->p_sysent->sv_mask)
526 sa->code &= p->p_sysent->sv_mask;
527 if (sa->code >= p->p_sysent->sv_size)
528 sa->callp = &p->p_sysent->sv_table[0];
530 sa->callp = &p->p_sysent->sv_table[sa->code];
532 sa->narg = sa->callp->sy_narg;
534 if (SV_PROC_FLAG(p, SV_ILP32)) {
535 argsz = sizeof(uint32_t);
537 for (i = 0; i < n; i++)
538 sa->args[i] = ((u_register_t *)(params))[i] &
541 argsz = sizeof(uint64_t);
543 for (i = 0; i < n; i++)
544 sa->args[i] = ((u_register_t *)(params))[i];
548 error = copyin(MOREARGS(frame->fixreg[1]), sa->args + n,
549 (sa->narg - n) * argsz);
554 if (SV_PROC_FLAG(p, SV_ILP32) && sa->narg > n) {
555 /* Expand the size of arguments copied from the stack */
557 for (i = sa->narg; i >= n; i--)
558 sa->args[i] = ((uint32_t *)(&sa->args[n]))[i-n];
563 td->td_retval[0] = 0;
564 td->td_retval[1] = frame->fixreg[FIRSTARG + 1];
569 #include "../../kern/subr_syscall.c"
572 syscall(struct trapframe *frame)
575 struct syscall_args sa;
579 td->td_frame = frame;
583 * Speculatively restore last user SLB segment, which we know is
584 * invalid already, since we are likely to do copyin()/copyout().
586 __asm __volatile ("slbmte %0, %1; isync" ::
587 "r"(td->td_pcb->pcb_cpu.aim.usr_vsid), "r"(USER_SLB_SLBE));
590 error = syscallenter(td, &sa);
591 syscallret(td, error, &sa);
595 /* Handle kernel SLB faults -- runs in real mode, all seat belts off */
597 handle_kernel_slb_spill(int type, register_t dar, register_t srr0)
599 struct slb *slbcache;
604 addr = (type == EXC_ISE) ? srr0 : dar;
605 slbcache = PCPU_GET(slb);
606 esid = (uintptr_t)addr >> ADDR_SR_SHFT;
607 slbe = (esid << SLBE_ESID_SHIFT) | SLBE_VALID;
609 /* See if the hardware flushed this somehow (can happen in LPARs) */
610 for (i = 0; i < n_slbs; i++)
611 if (slbcache[i].slbe == (slbe | (uint64_t)i))
614 /* Not in the map, needs to actually be added */
615 slbv = kernel_va_to_slbv(addr);
616 if (slbcache[USER_SLB_SLOT].slbe == 0) {
617 for (i = 0; i < n_slbs; i++) {
618 if (i == USER_SLB_SLOT)
620 if (!(slbcache[i].slbe & SLBE_VALID))
625 slbcache[USER_SLB_SLOT].slbe = 1;
628 /* Sacrifice a random SLB entry that is not the user entry */
630 if (i == USER_SLB_SLOT)
634 /* Write new entry */
635 slbcache[i].slbv = slbv;
636 slbcache[i].slbe = slbe | (uint64_t)i;
638 /* Trap handler will restore from cache on exit */
642 handle_user_slb_spill(pmap_t pm, vm_offset_t addr)
644 struct slb *user_entry;
648 esid = (uintptr_t)addr >> ADDR_SR_SHFT;
651 user_entry = user_va_to_slb_entry(pm, addr);
653 if (user_entry == NULL) {
654 /* allocate_vsid auto-spills it */
655 (void)allocate_user_vsid(pm, esid, 0);
658 * Check that another CPU has not already mapped this.
659 * XXX: Per-thread SLB caches would be better.
661 for (i = 0; i < pm->pm_slb_len; i++)
662 if (pm->pm_slb[i] == user_entry)
665 if (i == pm->pm_slb_len)
666 slb_insert_user(pm, user_entry);
675 trap_pfault(struct trapframe *frame, int user)
689 if (frame->exc == EXC_ISI) {
691 ftype = VM_PROT_EXECUTE;
692 if (frame->srr1 & SRR1_ISI_PFAULT)
693 ftype |= VM_PROT_READ;
697 if (frame->cpu.booke.esr & ESR_ST)
699 if (frame->cpu.aim.dsisr & DSISR_STORE)
701 ftype = VM_PROT_WRITE;
703 ftype = VM_PROT_READ;
707 KASSERT(p->p_vmspace != NULL, ("trap_pfault: vmspace NULL"));
708 map = &p->p_vmspace->vm_map;
711 if (eva < VM_MAXUSER_ADDRESS) {
713 if ((eva >> ADDR_SR_SHFT) == (USER_ADDR >> ADDR_SR_SHFT)) {
715 map = &p->p_vmspace->vm_map;
718 user_sr = td->td_pcb->pcb_cpu.aim.usr_segm;
719 eva &= ADDR_PIDX | ADDR_POFF;
720 eva |= user_sr << ADDR_SR_SHFT;
726 va = trunc_page(eva);
728 /* Fault in the page. */
729 rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL);
731 * XXXDTRACE: add dtrace_doubletrap_func here?
734 if (rv == KERN_SUCCESS)
737 if (!user && handle_onfault(frame))
744 * For now, this only deals with the particular unaligned access case
745 * that gcc tends to generate. Eventually it should handle all of the
746 * possibilities that can happen on a 32-bit PowerPC in big-endian mode.
750 fix_unaligned(struct thread *td, struct trapframe *frame)
752 struct thread *fputhread;
760 indicator = (frame->cpu.booke.esr & (ESR_ST|ESR_SPE));
761 if (indicator & ESR_SPE) {
762 if (copyin((void *)frame->srr0, &inst, sizeof(inst)) != 0)
764 reg = EXC_ALI_SPE_REG(inst);
765 fpr = (double *)td->td_pcb->pcb_vec.vr[reg];
766 fputhread = PCPU_GET(vecthread);
768 /* Juggle the SPE to ensure that we've initialized
769 * the registers, and that their current state is in
772 if (fputhread != td) {
779 if (!(indicator & ESR_ST)) {
780 if (copyin((void *)frame->dar, fpr,
781 sizeof(double)) != 0)
783 frame->fixreg[reg] = td->td_pcb->pcb_vec.vr[reg][1];
786 td->td_pcb->pcb_vec.vr[reg][1] = frame->fixreg[reg];
787 if (copyout(fpr, (void *)frame->dar,
788 sizeof(double)) != 0)
794 indicator = EXC_ALI_OPCODE_INDICATOR(frame->cpu.aim.dsisr);
799 reg = EXC_ALI_RST(frame->cpu.aim.dsisr);
800 fpr = &td->td_pcb->pcb_fpu.fpr[reg].fpr;
801 fputhread = PCPU_GET(fputhread);
803 /* Juggle the FPU to ensure that we've initialized
804 * the FPRs, and that their current state is in
807 if (fputhread != td) {
814 if (indicator == EXC_ALI_LFD) {
815 if (copyin((void *)frame->dar, fpr,
816 sizeof(double)) != 0)
820 if (copyout(fpr, (void *)frame->dar,
821 sizeof(double)) != 0)
833 int db_trap_glue(struct trapframe *); /* Called from trap_subr.S */
836 db_trap_glue(struct trapframe *frame)
838 if (!(frame->srr1 & PSL_PR)
839 && (frame->exc == EXC_TRC || frame->exc == EXC_RUNMODETRC
841 || (frame->exc == EXC_PGM
842 && (frame->srr1 & EXC_PGM_TRAP))
844 || (frame->exc == EXC_DEBUG)
846 || frame->exc == EXC_BPT
847 || frame->exc == EXC_DSI)) {
848 int type = frame->exc;
850 /* Ignore DTrace traps. */
851 if (*(uint32_t *)frame->srr0 == EXC_DTRACE)
854 if (type == EXC_PGM && (frame->srr1 & EXC_PGM_TRAP)) {
856 if (frame->cpu.booke.esr & ESR_PTR) {
860 return (kdb_trap(type, 0, frame));