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 ppc_instr_emulate(struct trapframe *frame);
86 static int handle_onfault(struct trapframe *frame);
87 static void syscall(struct trapframe *frame);
89 static __inline void setusr(u_int);
91 int setfault(faultbuf); /* defined in locore.S */
93 /* Why are these not defined in a header? */
94 int badaddr(void *, size_t);
95 int badaddr_read(void *, size_t, int *);
97 struct powerpc_exception {
102 static struct powerpc_exception powerpc_exceptions[] = {
103 { 0x0100, "system reset" },
104 { 0x0200, "machine check" },
105 { 0x0300, "data storage interrupt" },
106 { 0x0400, "instruction storage interrupt" },
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);
152 td = PCPU_GET(curthread);
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;
178 sig = trap_pfault(frame, 1);
186 KASSERT((td->td_pcb->pcb_flags & PCB_FPU) != PCB_FPU,
187 ("FPU already enabled for thread"));
192 KASSERT((td->td_pcb->pcb_flags & PCB_VEC) != PCB_VEC,
193 ("Altivec already enabled for thread"));
200 * We get a VPU assist exception for IEEE mode
201 * vector operations on denormalized floats.
202 * Emulating this is a giant pain, so for now,
203 * just switch off IEEE mode and treat them as
208 td->td_pcb->pcb_vec.vscr |= ALTIVEC_VSCR_NJ;
213 if (fix_unaligned(td, frame) != 0)
220 /* Identify the trap reason */
221 if (frame->srr1 & EXC_PGM_TRAP)
223 else if (ppc_instr_emulate(frame) == 0)
233 /* Kernel Mode Traps */
235 KASSERT(cold || td->td_ucred != NULL,
236 ("kernel trap doesn't have ucred"));
239 if (trap_pfault(frame, 0) == 0)
243 if (handle_onfault(frame))
253 if (td != PCPU_GET(vecthread) ||
254 td->td_pcb->pcb_veccpu != PCPU_GET(cpuid))
255 frame->srr1 &= ~PSL_VEC;
259 if (p->p_sysent->sv_transtrap != NULL)
260 sig = (p->p_sysent->sv_transtrap)(sig, type);
261 ksiginfo_init_trap(&ksi);
263 ksi.ksi_code = (int) ucode; /* XXX, not POSIX */
264 /* ksi.ksi_addr = ? */
265 ksi.ksi_trapno = type;
266 trapsignal(td, &ksi);
270 mtx_assert(&Giant, MA_NOTOWNED);
274 trap_fatal(struct trapframe *frame)
277 printtrap(frame->exc, frame, 1, (frame->srr1 & PSL_PR));
279 if ((debugger_on_panic || kdb_active) &&
280 kdb_trap(frame->exc, 0, frame))
283 panic("%s trap", trapname(frame->exc));
287 printtrap(u_int vector, struct trapframe *frame, int isfatal, int user)
291 printf("%s %s trap:\n", isfatal ? "fatal" : "handled",
292 user ? "user" : "kernel");
294 printf(" exception = 0x%x (%s)\n", vector >> 8,
298 printf(" virtual address = 0x%x\n", frame->cpu.aim.dar);
301 printf(" virtual address = 0x%x\n", frame->srr0);
304 printf(" srr0 = 0x%x\n", frame->srr0);
305 printf(" srr1 = 0x%x\n", frame->srr1);
306 printf(" lr = 0x%x\n", frame->lr);
307 printf(" curthread = %p\n", curthread);
308 if (curthread != NULL)
309 printf(" pid = %d, comm = %s\n",
310 curthread->td_proc->p_pid, curthread->td_name);
315 * Handles a fatal fault when we have onfault state to recover. Returns
316 * non-zero if there was onfault recovery state available.
319 handle_onfault(struct trapframe *frame)
325 fb = td->td_pcb->pcb_onfault;
327 frame->srr0 = (*fb)[0];
328 frame->fixreg[1] = (*fb)[1];
329 frame->fixreg[2] = (*fb)[2];
330 frame->fixreg[3] = 1;
331 frame->cr = (*fb)[3];
332 bcopy(&(*fb)[4], &frame->fixreg[13],
333 19 * sizeof(register_t));
340 cpu_fetch_syscall_args(struct thread *td, struct syscall_args *sa)
343 struct trapframe *frame;
348 frame = td->td_frame;
350 sa->code = frame->fixreg[0];
351 params = (caddr_t)(frame->fixreg + FIRSTARG);
354 if (sa->code == SYS_syscall) {
356 * code is first argument,
357 * followed by actual args.
359 sa->code = *(u_int *) params;
360 params += sizeof(register_t);
362 } else if (sa->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 sa->code = *(u_int *) params;
370 params += sizeof(register_t);
374 if (p->p_sysent->sv_mask)
375 sa->code &= p->p_sysent->sv_mask;
376 if (sa->code >= p->p_sysent->sv_size)
377 sa->callp = &p->p_sysent->sv_table[0];
379 sa->callp = &p->p_sysent->sv_table[sa->code];
381 sa->narg = sa->callp->sy_narg;
383 bcopy(params, sa->args, n * sizeof(register_t));
385 error = copyin(MOREARGS(frame->fixreg[1]), sa->args + n,
386 (sa->narg - n) * sizeof(register_t));
391 td->td_retval[0] = 0;
392 td->td_retval[1] = frame->fixreg[FIRSTARG + 1];
398 syscall(struct trapframe *frame)
401 struct syscall_args sa;
404 td = PCPU_GET(curthread);
405 td->td_frame = frame;
407 error = syscallenter(td, &sa);
408 syscallret(td, error, &sa);
412 trap_pfault(struct trapframe *frame, int user)
424 if (frame->exc == EXC_ISI) {
426 ftype = VM_PROT_READ | VM_PROT_EXECUTE;
428 eva = frame->cpu.aim.dar;
429 if (frame->cpu.aim.dsisr & DSISR_STORE)
430 ftype = VM_PROT_WRITE;
432 ftype = VM_PROT_READ;
436 map = &p->p_vmspace->vm_map;
438 if ((eva >> ADDR_SR_SHFT) == USER_SR) {
439 if (p->p_vmspace == NULL)
445 eva &= ADDR_PIDX | ADDR_POFF;
446 eva |= user_sr << ADDR_SR_SHFT;
447 map = &p->p_vmspace->vm_map;
452 va = trunc_page(eva);
454 if (map != kernel_map) {
456 * Keep swapout from messing with us during this
463 /* Fault in the user page: */
464 rv = vm_fault(map, va, ftype,
465 (ftype & VM_PROT_WRITE) ? VM_FAULT_DIRTY
473 * Don't have to worry about process locking or stacks in the
476 rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL);
479 if (rv == KERN_SUCCESS)
482 if (!user && handle_onfault(frame))
489 setusr(u_int content)
491 __asm __volatile ("isync; mtsr %0,%1; isync"
492 :: "n"(USER_SR), "r"(content));
496 badaddr(void *addr, size_t size)
498 return (badaddr_read(addr, size, NULL));
502 badaddr_read(void *addr, size_t size, int *rptr)
508 /* Get rid of any stale machine checks that have been waiting. */
509 __asm __volatile ("sync; isync");
511 td = PCPU_GET(curthread);
514 td->td_pcb->pcb_onfault = 0;
515 __asm __volatile ("sync");
519 __asm __volatile ("sync");
523 x = *(volatile int8_t *)addr;
526 x = *(volatile int16_t *)addr;
529 x = *(volatile int32_t *)addr;
532 panic("badaddr: invalid size (%d)", size);
535 /* Make sure we took the machine check, if we caused one. */
536 __asm __volatile ("sync; isync");
538 td->td_pcb->pcb_onfault = 0;
539 __asm __volatile ("sync"); /* To be sure. */
541 /* Use the value to avoid reorder. */
549 * For now, this only deals with the particular unaligned access case
550 * that gcc tends to generate. Eventually it should handle all of the
551 * possibilities that can happen on a 32-bit PowerPC in big-endian mode.
555 fix_unaligned(struct thread *td, struct trapframe *frame)
557 struct thread *fputhread;
561 indicator = EXC_ALI_OPCODE_INDICATOR(frame->cpu.aim.dsisr);
566 reg = EXC_ALI_RST(frame->cpu.aim.dsisr);
567 fpr = &td->td_pcb->pcb_fpu.fpr[reg];
568 fputhread = PCPU_GET(fputhread);
570 /* Juggle the FPU to ensure that we've initialized
571 * the FPRs, and that their current state is in
574 if (fputhread != td) {
581 if (indicator == EXC_ALI_LFD) {
582 if (copyin((void *)frame->cpu.aim.dar, fpr,
583 sizeof(double)) != 0)
587 if (copyout(fpr, (void *)frame->cpu.aim.dar,
588 sizeof(double)) != 0)
599 ppc_instr_emulate(struct trapframe *frame)
604 instr = fuword32((void *)frame->srr0);
606 if ((instr & 0xfc1fffff) == 0x7c1f42a6) { /* mfpvr */
607 reg = (instr & ~0xfc1fffff) >> 21;
608 frame->fixreg[reg] = mfpvr();