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>
50 #include <sys/signalvar.h>
51 #include <sys/vmmeter.h>
53 #include <security/audit/audit.h>
57 #include <vm/vm_extern.h>
58 #include <vm/vm_param.h>
59 #include <vm/vm_kern.h>
60 #include <vm/vm_map.h>
61 #include <vm/vm_page.h>
63 #include <machine/_inttypes.h>
64 #include <machine/altivec.h>
65 #include <machine/cpu.h>
66 #include <machine/db_machdep.h>
67 #include <machine/fpu.h>
68 #include <machine/frame.h>
69 #include <machine/pcb.h>
70 #include <machine/pmap.h>
71 #include <machine/psl.h>
72 #include <machine/trap.h>
73 #include <machine/spr.h>
74 #include <machine/sr.h>
76 static void trap_fatal(struct trapframe *frame);
77 static void printtrap(u_int vector, struct trapframe *frame, int isfatal,
79 static int trap_pfault(struct trapframe *frame, int user);
80 static int fix_unaligned(struct thread *td, struct trapframe *frame);
81 static int ppc_instr_emulate(struct trapframe *frame);
82 static int handle_onfault(struct trapframe *frame);
83 static void syscall(struct trapframe *frame);
86 static int handle_slb_spill(pmap_t pm, vm_offset_t addr);
89 int setfault(faultbuf); /* defined in locore.S */
91 /* Why are these not defined in a header? */
92 int badaddr(void *, size_t);
93 int badaddr_read(void *, size_t, int *);
95 struct powerpc_exception {
100 static struct powerpc_exception powerpc_exceptions[] = {
101 { 0x0100, "system reset" },
102 { 0x0200, "machine check" },
103 { 0x0300, "data storage interrupt" },
104 { 0x0380, "data segment exception" },
105 { 0x0400, "instruction storage interrupt" },
106 { 0x0480, "instruction segment exception" },
107 { 0x0500, "external interrupt" },
108 { 0x0600, "alignment" },
109 { 0x0700, "program" },
110 { 0x0800, "floating-point unavailable" },
111 { 0x0900, "decrementer" },
112 { 0x0c00, "system call" },
114 { 0x0e00, "floating-point assist" },
115 { 0x0f00, "performance monitoring" },
116 { 0x0f20, "altivec unavailable" },
117 { 0x1000, "instruction tlb miss" },
118 { 0x1100, "data load tlb miss" },
119 { 0x1200, "data store tlb miss" },
120 { 0x1300, "instruction breakpoint" },
121 { 0x1400, "system management" },
122 { 0x1600, "altivec assist" },
123 { 0x1700, "thermal management" },
124 { 0x2000, "run mode/trace" },
129 trapname(u_int vector)
131 struct powerpc_exception *pe;
133 for (pe = powerpc_exceptions; pe->vector != 0x3000; pe++) {
134 if (pe->vector == vector)
142 trap(struct trapframe *frame)
150 PCPU_INC(cnt.v_trap);
155 type = ucode = frame->exc;
157 user = frame->srr1 & PSL_PR;
159 CTR3(KTR_TRAP, "trap: %s type=%s (%s)", td->td_name,
160 trapname(type), user ? "user" : "kernel");
164 td->td_frame = frame;
165 if (td->td_ucred != p->p_ucred)
166 cred_update_thread(td);
168 /* User Mode Traps */
172 frame->srr1 &= ~PSL_SE;
179 if (handle_slb_spill(&p->p_vmspace->vm_pmap,
180 (type == EXC_ISE) ? frame->srr0 :
181 frame->cpu.aim.dar) != 0)
187 sig = trap_pfault(frame, 1);
195 KASSERT((td->td_pcb->pcb_flags & PCB_FPU) != PCB_FPU,
196 ("FPU already enabled for thread"));
201 KASSERT((td->td_pcb->pcb_flags & PCB_VEC) != PCB_VEC,
202 ("Altivec already enabled for thread"));
209 * We get a VPU assist exception for IEEE mode
210 * vector operations on denormalized floats.
211 * Emulating this is a giant pain, so for now,
212 * just switch off IEEE mode and treat them as
217 td->td_pcb->pcb_vec.vscr |= ALTIVEC_VSCR_NJ;
222 if (fix_unaligned(td, frame) != 0)
229 /* Identify the trap reason */
230 if (frame->srr1 & EXC_PGM_TRAP)
232 else if (ppc_instr_emulate(frame) == 0)
242 /* Kernel Mode Traps */
244 KASSERT(cold || td->td_ucred != NULL,
245 ("kernel trap doesn't have ucred"));
248 if (trap_pfault(frame, 0) == 0)
253 if ((frame->cpu.aim.dar & SEGMENT_MASK) == USER_ADDR) {
254 __asm __volatile ("slbmte %0, %1" ::
255 "r"(td->td_pcb->pcb_cpu.aim.usr_vsid),
262 if (handle_slb_spill(kernel_pmap,
263 (type == EXC_ISE) ? frame->srr0 :
264 frame->cpu.aim.dar) != 0)
265 panic("Fault handling kernel SLB miss");
269 if (handle_onfault(frame))
279 if (p->p_sysent->sv_transtrap != NULL)
280 sig = (p->p_sysent->sv_transtrap)(sig, type);
281 ksiginfo_init_trap(&ksi);
283 ksi.ksi_code = (int) ucode; /* XXX, not POSIX */
284 /* ksi.ksi_addr = ? */
285 ksi.ksi_trapno = type;
286 trapsignal(td, &ksi);
290 mtx_assert(&Giant, MA_NOTOWNED);
294 trap_fatal(struct trapframe *frame)
297 printtrap(frame->exc, frame, 1, (frame->srr1 & PSL_PR));
299 if ((debugger_on_panic || kdb_active) &&
300 kdb_trap(frame->exc, 0, frame))
303 panic("%s trap", trapname(frame->exc));
307 printtrap(u_int vector, struct trapframe *frame, int isfatal, int user)
311 printf("%s %s trap:\n", isfatal ? "fatal" : "handled",
312 user ? "user" : "kernel");
314 printf(" exception = 0x%x (%s)\n", vector >> 8,
319 printf(" virtual address = 0x%" PRIxPTR "\n",
324 printf(" virtual address = 0x%" PRIxPTR "\n", frame->srr0);
327 printf(" srr0 = 0x%" PRIxPTR "\n", frame->srr0);
328 printf(" srr1 = 0x%" PRIxPTR "\n", frame->srr1);
329 printf(" lr = 0x%" PRIxPTR "\n", frame->lr);
330 printf(" curthread = %p\n", curthread);
331 if (curthread != NULL)
332 printf(" pid = %d, comm = %s\n",
333 curthread->td_proc->p_pid, curthread->td_name);
338 * Handles a fatal fault when we have onfault state to recover. Returns
339 * non-zero if there was onfault recovery state available.
342 handle_onfault(struct trapframe *frame)
348 fb = td->td_pcb->pcb_onfault;
350 frame->srr0 = (*fb)[0];
351 frame->fixreg[1] = (*fb)[1];
352 frame->fixreg[2] = (*fb)[2];
353 frame->fixreg[3] = 1;
354 frame->cr = (*fb)[3];
355 bcopy(&(*fb)[4], &frame->fixreg[13],
356 19 * sizeof(register_t));
363 cpu_fetch_syscall_args(struct thread *td, struct syscall_args *sa)
366 struct trapframe *frame;
372 frame = td->td_frame;
374 sa->code = frame->fixreg[0];
375 params = (caddr_t)(frame->fixreg + FIRSTARG);
378 if (sa->code == SYS_syscall) {
380 * code is first argument,
381 * followed by actual args.
383 sa->code = *(register_t *) params;
384 params += sizeof(register_t);
386 } else if (sa->code == SYS___syscall) {
388 * Like syscall, but code is a quad,
389 * so as to maintain quad alignment
390 * for the rest of the args.
392 if (SV_PROC_FLAG(p, SV_ILP32)) {
393 params += sizeof(register_t);
394 sa->code = *(register_t *) params;
395 params += sizeof(register_t);
398 sa->code = *(register_t *) params;
399 params += sizeof(register_t);
404 if (p->p_sysent->sv_mask)
405 sa->code &= p->p_sysent->sv_mask;
406 if (sa->code >= p->p_sysent->sv_size)
407 sa->callp = &p->p_sysent->sv_table[0];
409 sa->callp = &p->p_sysent->sv_table[sa->code];
411 sa->narg = sa->callp->sy_narg;
413 if (SV_PROC_FLAG(p, SV_ILP32)) {
414 argsz = sizeof(uint32_t);
416 for (i = 0; i < n; i++)
417 sa->args[i] = ((u_register_t *)(params))[i] &
420 argsz = sizeof(uint64_t);
422 for (i = 0; i < n; i++)
423 sa->args[i] = ((u_register_t *)(params))[i];
427 error = copyin(MOREARGS(frame->fixreg[1]), sa->args + n,
428 (sa->narg - n) * argsz);
433 if (SV_PROC_FLAG(p, SV_ILP32) && sa->narg > n) {
434 /* Expand the size of arguments copied from the stack */
436 for (i = sa->narg; i >= n; i--)
437 sa->args[i] = ((uint32_t *)(&sa->args[n]))[i-n];
442 td->td_retval[0] = 0;
443 td->td_retval[1] = frame->fixreg[FIRSTARG + 1];
448 #include "../../kern/subr_syscall.c"
451 syscall(struct trapframe *frame)
454 struct syscall_args sa;
458 td->td_frame = frame;
462 * Speculatively restore last user SLB segment, which we know is
463 * invalid already, since we are likely to do copyin()/copyout().
465 __asm __volatile ("slbmte %0, %1; isync" ::
466 "r"(td->td_pcb->pcb_cpu.aim.usr_vsid), "r"(USER_SLB_SLBE));
469 error = syscallenter(td, &sa);
470 syscallret(td, error, &sa);
475 handle_slb_spill(pmap_t pm, vm_offset_t addr)
477 struct slb *user_entry;
481 esid = (uintptr_t)addr >> ADDR_SR_SHFT;
483 if (pm == kernel_pmap) {
484 slb_insert_kernel((esid << SLBE_ESID_SHIFT) | SLBE_VALID,
485 kernel_va_to_slbv(addr));
490 user_entry = user_va_to_slb_entry(pm, addr);
492 if (user_entry == NULL) {
493 /* allocate_vsid auto-spills it */
494 (void)allocate_user_vsid(pm, esid, 0);
497 * Check that another CPU has not already mapped this.
498 * XXX: Per-thread SLB caches would be better.
500 for (i = 0; i < pm->pm_slb_len; i++)
501 if (pm->pm_slb[i] == user_entry)
504 if (i == pm->pm_slb_len)
505 slb_insert_user(pm, user_entry);
514 trap_pfault(struct trapframe *frame, int user)
526 if (frame->exc == EXC_ISI) {
528 ftype = VM_PROT_EXECUTE;
529 if (frame->srr1 & SRR1_ISI_PFAULT)
530 ftype |= VM_PROT_READ;
532 eva = frame->cpu.aim.dar;
533 if (frame->cpu.aim.dsisr & DSISR_STORE)
534 ftype = VM_PROT_WRITE;
536 ftype = VM_PROT_READ;
540 map = &p->p_vmspace->vm_map;
542 if ((eva >> ADDR_SR_SHFT) == (USER_ADDR >> ADDR_SR_SHFT)) {
543 if (p->p_vmspace == NULL)
546 map = &p->p_vmspace->vm_map;
548 user_sr = td->td_pcb->pcb_cpu.aim.usr_segm;
549 eva &= ADDR_PIDX | ADDR_POFF;
550 eva |= user_sr << ADDR_SR_SHFT;
555 va = trunc_page(eva);
557 if (map != kernel_map) {
559 * Keep swapout from messing with us during this
566 /* Fault in the user page: */
567 rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL);
574 * Don't have to worry about process locking or stacks in the
577 rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL);
580 if (rv == KERN_SUCCESS)
583 if (!user && handle_onfault(frame))
590 badaddr(void *addr, size_t size)
592 return (badaddr_read(addr, size, NULL));
596 badaddr_read(void *addr, size_t size, int *rptr)
602 /* Get rid of any stale machine checks that have been waiting. */
603 __asm __volatile ("sync; isync");
608 td->td_pcb->pcb_onfault = 0;
609 __asm __volatile ("sync");
613 __asm __volatile ("sync");
617 x = *(volatile int8_t *)addr;
620 x = *(volatile int16_t *)addr;
623 x = *(volatile int32_t *)addr;
626 panic("badaddr: invalid size (%zd)", size);
629 /* Make sure we took the machine check, if we caused one. */
630 __asm __volatile ("sync; isync");
632 td->td_pcb->pcb_onfault = 0;
633 __asm __volatile ("sync"); /* To be sure. */
635 /* Use the value to avoid reorder. */
643 * For now, this only deals with the particular unaligned access case
644 * that gcc tends to generate. Eventually it should handle all of the
645 * possibilities that can happen on a 32-bit PowerPC in big-endian mode.
649 fix_unaligned(struct thread *td, struct trapframe *frame)
651 struct thread *fputhread;
655 indicator = EXC_ALI_OPCODE_INDICATOR(frame->cpu.aim.dsisr);
660 reg = EXC_ALI_RST(frame->cpu.aim.dsisr);
661 fpr = &td->td_pcb->pcb_fpu.fpr[reg];
662 fputhread = PCPU_GET(fputhread);
664 /* Juggle the FPU to ensure that we've initialized
665 * the FPRs, and that their current state is in
668 if (fputhread != td) {
675 if (indicator == EXC_ALI_LFD) {
676 if (copyin((void *)frame->cpu.aim.dar, fpr,
677 sizeof(double)) != 0)
681 if (copyout(fpr, (void *)frame->cpu.aim.dar,
682 sizeof(double)) != 0)
693 ppc_instr_emulate(struct trapframe *frame)
698 instr = fuword32((void *)frame->srr0);
700 if ((instr & 0xfc1fffff) == 0x7c1f42a6) { /* mfpvr */
701 reg = (instr & ~0xfc1fffff) >> 21;
702 frame->fixreg[reg] = mfpvr();