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"
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>
53 #include <sys/vmmeter.h>
55 #include <security/audit/audit.h>
59 #include <vm/vm_extern.h>
60 #include <vm/vm_param.h>
61 #include <vm/vm_kern.h>
62 #include <vm/vm_map.h>
63 #include <vm/vm_page.h>
65 #include <machine/cpu.h>
66 #include <machine/db_machdep.h>
67 #include <machine/frame.h>
68 #include <machine/pcb.h>
69 #include <machine/pmap.h>
70 #include <machine/psl.h>
71 #include <machine/trap.h>
72 #include <machine/spr.h>
78 #define FAULTBUF_CTR 4
79 #define FAULTBUF_XER 5
80 #define FAULTBUF_R13 6
82 static void trap_fatal(struct trapframe *frame);
83 static void printtrap(u_int vector, struct trapframe *frame, int isfatal,
85 static int trap_pfault(struct trapframe *frame, int user);
86 static int fix_unaligned(struct thread *td, struct trapframe *frame);
87 static int handle_onfault(struct trapframe *frame);
88 static void syscall(struct trapframe *frame);
90 struct powerpc_exception {
95 static struct powerpc_exception powerpc_exceptions[] = {
96 { EXC_CRIT, "critical input" },
97 { EXC_MCHK, "machine check" },
98 { EXC_DSI, "data storage interrupt" },
99 { EXC_ISI, "instruction storage interrupt" },
100 { EXC_EXI, "external interrupt" },
101 { EXC_ALI, "alignment" },
102 { EXC_PGM, "program" },
103 { EXC_SC, "system call" },
104 { EXC_APU, "auxiliary proc unavailable" },
105 { EXC_DECR, "decrementer" },
106 { EXC_FIT, "fixed-interval timer" },
107 { EXC_WDOG, "watchdog timer" },
108 { EXC_DTMISS, "data tlb miss" },
109 { EXC_ITMISS, "instruction tlb miss" },
110 { EXC_DEBUG, "debug" },
111 { EXC_PERF, "performance monitoring" },
116 trapname(u_int vector)
118 struct powerpc_exception *pe;
120 for (pe = powerpc_exceptions; pe->vector != EXC_LAST; pe++) {
121 if (pe->vector == vector)
129 trap(struct trapframe *frame)
143 PCPU_INC(cnt.v_trap);
150 user = (frame->srr1 & PSL_PR) ? 1 : 0;
152 CTR3(KTR_TRAP, "trap: %s type=%s (%s)", p->p_comm,
153 trapname(type), user ? "user" : "kernel");
156 td->td_frame = frame;
157 if (td->td_ucred != p->p_ucred)
158 cred_update_thread(td);
160 /* User Mode Traps */
164 sig = trap_pfault(frame, 1);
172 if (fix_unaligned(td, frame) != 0)
178 case EXC_DEBUG: /* Single stepping */
179 mtspr(SPR_DBSR, mfspr(SPR_DBSR));
180 frame->srr1 &= ~PSL_DE;
181 frame->cpu.booke.dbcr0 &= ~(DBCR0_IDM || DBCR0_IC);
185 case EXC_PGM: /* Program exception */
186 sig = ppc_instr_emulate(frame, td->td_pcb);
193 /* Kernel Mode Traps */
194 KASSERT(cold || td->td_ucred != NULL,
195 ("kernel trap doesn't have ucred"));
199 mtspr(SPR_DBSR, mfspr(SPR_DBSR));
200 kdb_trap(frame->exc, 0, frame);
204 if (trap_pfault(frame, 0) == 0)
209 if (handle_onfault(frame))
214 if (frame->cpu.booke.esr & ESR_PTR)
215 kdb_trap(EXC_PGM, 0, frame);
225 if (p->p_sysent->sv_transtrap != NULL)
226 sig = (p->p_sysent->sv_transtrap)(sig, type);
227 ksiginfo_init_trap(&ksi);
229 ksi.ksi_code = type; /* XXX, not POSIX */
230 /* ksi.ksi_addr = ? */
231 ksi.ksi_trapno = type;
232 trapsignal(td, &ksi);
239 trap_fatal(struct trapframe *frame)
242 printtrap(frame->exc, frame, 1, (frame->srr1 & PSL_PR));
244 if ((debugger_on_panic || kdb_active) &&
245 kdb_trap(frame->exc, 0, frame))
248 panic("%s trap", trapname(frame->exc));
252 printtrap(u_int vector, struct trapframe *frame, int isfatal, int user)
257 printf("%s %s trap:\n", isfatal ? "fatal" : "handled",
258 user ? "user" : "kernel");
260 printf(" exception = 0x%x (%s)\n", vector, trapname(vector));
265 va = frame->cpu.booke.dear;
274 printf(" virtual address = 0x%08x\n", va);
275 printf(" srr0 = 0x%08x\n", frame->srr0);
276 printf(" srr1 = 0x%08x\n", frame->srr1);
277 printf(" curthread = %p\n", curthread);
278 if (curthread != NULL)
279 printf(" pid = %d, comm = %s\n",
280 curthread->td_proc->p_pid, curthread->td_proc->p_comm);
285 * Handles a fatal fault when we have onfault state to recover. Returns
286 * non-zero if there was onfault recovery state available.
289 handle_onfault(struct trapframe *frame)
295 fb = td->td_pcb->pcb_onfault;
297 frame->srr0 = (*fb)[FAULTBUF_LR];
298 frame->fixreg[1] = (*fb)[FAULTBUF_R1];
299 frame->fixreg[2] = (*fb)[FAULTBUF_R2];
300 frame->fixreg[3] = 1;
301 frame->cr = (*fb)[FAULTBUF_CR];
302 frame->ctr = (*fb)[FAULTBUF_CTR];
303 frame->xer = (*fb)[FAULTBUF_XER];
304 bcopy(&(*fb)[FAULTBUF_R13], &frame->fixreg[13],
305 19 * sizeof(register_t));
312 cpu_fetch_syscall_args(struct thread *td, struct syscall_args *sa)
315 struct trapframe *frame;
320 frame = td->td_frame;
322 sa->code = frame->fixreg[0];
323 params = (caddr_t)(frame->fixreg + FIRSTARG);
326 if (sa->code == SYS_syscall) {
328 * code is first argument,
329 * followed by actual args.
331 sa->code = *(u_int *) params;
332 params += sizeof(register_t);
334 } else if (sa->code == SYS___syscall) {
336 * Like syscall, but code is a quad,
337 * so as to maintain quad alignment
338 * for the rest of the args.
340 params += sizeof(register_t);
341 sa->code = *(u_int *) params;
342 params += sizeof(register_t);
346 if (p->p_sysent->sv_mask)
347 sa->code &= p->p_sysent->sv_mask;
348 if (sa->code >= p->p_sysent->sv_size)
349 sa->callp = &p->p_sysent->sv_table[0];
351 sa->callp = &p->p_sysent->sv_table[sa->code];
352 sa->narg = sa->callp->sy_narg;
354 bcopy(params, sa->args, n * sizeof(register_t));
356 error = copyin(MOREARGS(frame->fixreg[1]), sa->args + n,
357 (sa->narg - n) * sizeof(register_t));
362 td->td_retval[0] = 0;
363 td->td_retval[1] = frame->fixreg[FIRSTARG + 1];
368 #include "../../kern/subr_syscall.c"
371 syscall(struct trapframe *frame)
374 struct syscall_args sa;
378 td->td_frame = frame;
380 error = syscallenter(td, &sa);
381 syscallret(td, error, &sa);
385 trap_pfault(struct trapframe *frame, int user)
397 if (frame->exc == EXC_ISI) {
399 ftype = VM_PROT_READ | VM_PROT_EXECUTE;
402 eva = frame->cpu.booke.dear;
403 if (frame->cpu.booke.esr & ESR_ST)
404 ftype = VM_PROT_WRITE;
406 ftype = VM_PROT_READ;
410 KASSERT(p->p_vmspace != NULL, ("trap_pfault: vmspace NULL"));
411 map = &p->p_vmspace->vm_map;
413 if (eva < VM_MAXUSER_ADDRESS) {
415 if (p->p_vmspace == NULL)
418 map = &p->p_vmspace->vm_map;
424 va = trunc_page(eva);
426 if (map != kernel_map) {
428 * Keep swapout from messing with us during this
435 /* Fault in the user page: */
436 rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL);
443 * Don't have to worry about process locking or stacks in the
446 rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL);
449 if (rv == KERN_SUCCESS)
452 if (!user && handle_onfault(frame))
455 return ((rv == KERN_PROTECTION_FAILURE) ? SIGBUS : SIGSEGV);
459 * For now, this only deals with the particular unaligned access case
460 * that gcc tends to generate. Eventually it should handle all of the
461 * possibilities that can happen on a 32-bit PowerPC in big-endian mode.
465 fix_unaligned(struct thread *td, struct trapframe *frame)
468 struct thread *fputhread;
472 indicator = EXC_ALI_OPCODE_INDICATOR(frame->dsisr);
477 reg = EXC_ALI_RST(frame->dsisr);
478 fpr = &td->td_pcb->pcb_fpu.fpr[reg];
479 fputhread = PCPU_GET(fputhread);
480 /* Juggle the FPU to ensure that we've initialized
481 * the FPRs, and that their current state is in
484 if (fputhread != td) {
491 if (indicator == EXC_ALI_LFD) {
492 if (copyin((void *)frame->dar, fpr,
493 sizeof(double)) != 0)
497 if (copyout(fpr, (void *)frame->dar,
498 sizeof(double)) != 0)
510 int db_trap_glue(struct trapframe *);
512 db_trap_glue(struct trapframe *tf)
514 if (!(tf->srr1 & PSL_PR))
515 return (kdb_trap(tf->exc, 0, tf));