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/* $NetBSD: trap.c,v 1.22 2004/03/14 01:08:48 cl Exp $ */
/*
* Copyright 2001 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Eduardo Horvath and Simon Burge for Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
* Copyright (C) 1995, 1996 TooLs GmbH.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.22 2004/03/14 01:08:48 cl Exp $");
#include "opt_altivec.h"
#include "opt_ddb.h"
#include "opt_ktrace.h"
#include "opt_systrace.h"
#include "opt_syscall_debug.h"
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/reboot.h>
#include <sys/syscall.h>
#include <sys/systm.h>
#include <sys/user.h>
#ifdef KTRACE
#include <sys/ktrace.h>
#endif
#include <sys/pool.h>
#include <sys/sa.h>
#include <sys/savar.h>
#ifdef SYSTRACE
#include <sys/systrace.h>
#endif
#include <sys/userret.h>
#include <uvm/uvm_extern.h>
#include <dev/cons.h>
#include <machine/cpu.h>
#include <machine/db_machdep.h>
#include <machine/fpu.h>
#include <machine/frame.h>
#include <machine/pcb.h>
#include <machine/psl.h>
#include <machine/trap.h>
#include <powerpc/spr.h>
#include <powerpc/ibm4xx/pmap.h>
#include <powerpc/ibm4xx/tlb.h>
#include <powerpc/fpu/fpu_extern.h>
/* These definitions should probably be somewhere else XXX */
#define FIRSTARG 3 /* first argument is in reg 3 */
#define NARGREG 8 /* 8 args are in registers */
#define MOREARGS(sp) ((caddr_t)((int)(sp) + 8)) /* more args go here */
static int fix_unaligned __P((struct lwp *l, struct trapframe *frame));
void trap __P((struct trapframe *)); /* Called from locore / trap_subr */
/* Why are these not defined in a header? */
int badaddr __P((void *, size_t));
int badaddr_read __P((void *, size_t, int *));
int ctx_setup __P((int, int));
#ifdef DEBUG
#define TDB_ALL 0x1
int trapdebug = /* TDB_ALL */ 0;
#define DBPRINTF(x, y) if (trapdebug & (x)) printf y
#else
#define DBPRINTF(x, y)
#endif
void
trap(struct trapframe *frame)
{
struct lwp *l = curlwp;
struct proc *p = l ? l->l_proc : NULL;
int type = frame->exc;
int ftype, rv;
ksiginfo_t ksi;
KASSERT(l == 0 || (l->l_stat == LSONPROC));
if (frame->srr1 & PSL_PR)
type |= EXC_USER;
ftype = VM_PROT_READ;
DBPRINTF(TDB_ALL, ("trap(%x) at %lx from frame %p &frame %p\n",
type, frame->srr0, frame, &frame));
switch (type) {
case EXC_DEBUG|EXC_USER:
{
int srr2, srr3;
__asm __volatile("mfspr %0,0x3f0" :
"=r" (rv), "=r" (srr2), "=r" (srr3) :);
printf("debug reg is %x srr2 %x srr3 %x\n", rv, srr2,
srr3);
/* XXX fall through or break here?! */
}
/*
* DEBUG intr -- probably single-step.
*/
case EXC_TRC|EXC_USER:
frame->srr1 &= ~PSL_SE;
KSI_INIT_TRAP(&ksi);
ksi.ksi_signo = SIGTRAP;
ksi.ksi_trap = EXC_TRC;
ksi.ksi_addr = (void *)frame->srr0;
KERNEL_PROC_LOCK(l);
trapsignal(l, &ksi);
KERNEL_PROC_UNLOCK(l);
break;
/*
* If we could not find and install appropriate TLB entry, fall through.
*/
case EXC_DSI:
/* FALLTHROUGH */
case EXC_DTMISS:
{
struct vm_map *map;
vaddr_t va;
struct faultbuf *fb = NULL;
KERNEL_LOCK(LK_CANRECURSE|LK_EXCLUSIVE);
va = frame->dar;
if (frame->tf_xtra[TF_PID] == KERNEL_PID) {
map = kernel_map;
} else {
map = &p->p_vmspace->vm_map;
if (l->l_flag & L_SA) {
l->l_savp->savp_faultaddr = va;
l->l_flag |= L_SA_PAGEFAULT;
}
}
if (frame->tf_xtra[TF_ESR] & (ESR_DST|ESR_DIZ))
ftype = VM_PROT_WRITE;
DBPRINTF(TDB_ALL,
("trap(EXC_DSI) at %lx %s fault on %p esr %x\n",
frame->srr0,
(ftype & VM_PROT_WRITE) ? "write" : "read",
(void *)va, frame->tf_xtra[TF_ESR]));
rv = uvm_fault(map, trunc_page(va), 0, ftype);
KERNEL_UNLOCK();
if (map != kernel_map)
l->l_flag &= ~L_SA_PAGEFAULT;
if (rv == 0)
goto done;
if ((fb = l->l_addr->u_pcb.pcb_onfault) != NULL) {
frame->tf_xtra[TF_PID] = KERNEL_PID;
frame->srr0 = fb->fb_pc;
frame->srr1 |= PSL_IR; /* Re-enable IMMU */
frame->fixreg[1] = fb->fb_sp;
frame->fixreg[2] = fb->fb_r2;
frame->fixreg[3] = 1; /* Return TRUE */
frame->cr = fb->fb_cr;
memcpy(&frame->fixreg[13], fb->fb_fixreg,
sizeof(fb->fb_fixreg));
goto done;
}
}
goto brain_damage;
case EXC_DSI|EXC_USER:
/* FALLTHROUGH */
case EXC_DTMISS|EXC_USER:
KERNEL_PROC_LOCK(l);
if (frame->tf_xtra[TF_ESR] & (ESR_DST|ESR_DIZ))
ftype = VM_PROT_WRITE;
DBPRINTF(TDB_ALL,
("trap(EXC_DSI|EXC_USER) at %lx %s fault on %lx %x\n",
frame->srr0, (ftype & VM_PROT_WRITE) ? "write" : "read",
frame->dar, frame->tf_xtra[TF_ESR]));
KASSERT(l == curlwp && (l->l_stat == LSONPROC));
if (l->l_flag & L_SA) {
l->l_savp->savp_faultaddr = (vaddr_t)frame->dar;
l->l_flag |= L_SA_PAGEFAULT;
}
rv = uvm_fault(&p->p_vmspace->vm_map, trunc_page(frame->dar),
0, ftype);
if (rv == 0) {
l->l_flag &= ~L_SA_PAGEFAULT;
KERNEL_PROC_UNLOCK(l);
break;
}
KSI_INIT_TRAP(&ksi);
ksi.ksi_signo = SIGSEGV;
ksi.ksi_trap = EXC_DSI;
ksi.ksi_addr = (void *)frame->dar;
if (rv == ENOMEM) {
printf("UVM: pid %d (%s) lid %d, uid %d killed: "
"out of swap\n",
p->p_pid, p->p_comm, l->l_lid,
p->p_cred && p->p_ucred ?
p->p_ucred->cr_uid : -1);
ksi.ksi_signo = SIGKILL;
}
trapsignal(l, &ksi);
l->l_flag &= ~L_SA_PAGEFAULT;
KERNEL_PROC_UNLOCK(l);
break;
case EXC_ITMISS|EXC_USER:
case EXC_ISI|EXC_USER:
KERNEL_PROC_LOCK(l);
if (l->l_flag & L_SA) {
l->l_savp->savp_faultaddr = (vaddr_t)frame->srr0;
l->l_flag |= L_SA_PAGEFAULT;
}
ftype = VM_PROT_EXECUTE;
DBPRINTF(TDB_ALL,
("trap(EXC_ISI|EXC_USER) at %lx execute fault tf %p\n",
frame->srr0, frame));
rv = uvm_fault(&p->p_vmspace->vm_map, trunc_page(frame->srr0),
0, ftype);
if (rv == 0) {
l->l_flag &= ~L_SA_PAGEFAULT;
KERNEL_PROC_UNLOCK(l);
break;
}
KSI_INIT_TRAP(&ksi);
ksi.ksi_signo = SIGSEGV;
ksi.ksi_trap = EXC_ISI;
ksi.ksi_addr = (void *)frame->srr0;
ksi.ksi_code = (rv == EACCES ? SEGV_ACCERR : SEGV_MAPERR);
trapsignal(l, &ksi);
l->l_flag &= ~L_SA_PAGEFAULT;
KERNEL_PROC_UNLOCK(l);
break;
case EXC_AST|EXC_USER:
curcpu()->ci_astpending = 0; /* we are about to do it */
KERNEL_PROC_LOCK(l);
uvmexp.softs++;
if (p->p_flag & P_OWEUPC) {
p->p_flag &= ~P_OWEUPC;
ADDUPROF(p);
}
/* Check whether we are being preempted. */
if (curcpu()->ci_want_resched)
preempt(0);
KERNEL_PROC_UNLOCK(l);
break;
case EXC_ALI|EXC_USER:
KERNEL_PROC_LOCK(l);
if (fix_unaligned(l, frame) != 0) {
KSI_INIT_TRAP(&ksi);
ksi.ksi_signo = SIGBUS;
ksi.ksi_trap = EXC_ALI;
ksi.ksi_addr = (void *)frame->dar;
trapsignal(l, &ksi);
} else
frame->srr0 += 4;
KERNEL_PROC_UNLOCK(l);
break;
case EXC_PGM|EXC_USER:
/*
* Illegal insn:
*
* let's try to see if it's FPU and can be emulated.
*/
uvmexp.traps ++;
if (!(l->l_addr->u_pcb.pcb_flags & PCB_FPU)) {
memset(&l->l_addr->u_pcb.pcb_fpu, 0,
sizeof l->l_addr->u_pcb.pcb_fpu);
l->l_addr->u_pcb.pcb_flags |= PCB_FPU;
}
if ((rv = fpu_emulate(frame,
(struct fpreg *)&l->l_addr->u_pcb.pcb_fpu))) {
KSI_INIT_TRAP(&ksi);
ksi.ksi_signo = rv;
ksi.ksi_trap = EXC_PGM;
ksi.ksi_addr = (void *)frame->srr0;
KERNEL_PROC_LOCK(l);
trapsignal(l, &ksi);
KERNEL_PROC_UNLOCK(l);
}
break;
case EXC_MCHK:
{
struct faultbuf *fb;
if ((fb = l->l_addr->u_pcb.pcb_onfault) != NULL) {
frame->tf_xtra[TF_PID] = KERNEL_PID;
frame->srr0 = fb->fb_pc;
frame->srr1 |= PSL_IR; /* Re-enable IMMU */
frame->fixreg[1] = fb->fb_sp;
frame->fixreg[2] = fb->fb_r2;
frame->fixreg[3] = 1; /* Return TRUE */
frame->cr = fb->fb_cr;
memcpy(&frame->fixreg[13], fb->fb_fixreg,
sizeof(fb->fb_fixreg));
goto done;
}
}
goto brain_damage;
default:
brain_damage:
printf("trap type 0x%x at 0x%lx\n", type, frame->srr0);
#ifdef DDB
if (kdb_trap(type, frame))
goto done;
#endif
#ifdef TRAP_PANICWAIT
printf("Press a key to panic.\n");
cngetc();
#endif
panic("trap");
}
/* Invoke MI userret code */
mi_userret(l);
curcpu()->ci_schedstate.spc_curpriority = l->l_priority = l->l_usrpri;
done:
return;
}
int
ctx_setup(int ctx, int srr1)
{
volatile struct pmap *pm;
/* Update PID if we're returning to user mode. */
if (srr1 & PSL_PR) {
pm = curproc->p_vmspace->vm_map.pmap;
if (!pm->pm_ctx) {
ctx_alloc((struct pmap *)pm);
}
ctx = pm->pm_ctx;
if (srr1 & PSL_SE) {
int dbreg, mask = 0x48000000;
/*
* Set the Internal Debug and
* Instruction Completion bits of
* the DBCR0 register.
*
* XXX this is also used by jtag debuggers...
*/
__asm __volatile("mfspr %0,0x3f2;"
"or %0,%0,%1;"
"mtspr 0x3f2,%0;" :
"=&r" (dbreg) : "r" (mask));
}
}
else if (!ctx) {
ctx = KERNEL_PID;
}
return (ctx);
}
/*
* Used by copyin()/copyout()
*/
extern vaddr_t vmaprange __P((struct proc *, vaddr_t, vsize_t, int));
extern void vunmaprange __P((vaddr_t, vsize_t));
static int bigcopyin __P((const void *, void *, size_t ));
static int bigcopyout __P((const void *, void *, size_t ));
int
copyin(const void *udaddr, void *kaddr, size_t len)
{
struct pmap *pm = curproc->p_vmspace->vm_map.pmap;
int msr, pid, tmp, ctx;
struct faultbuf env;
/* For bigger buffers use the faster copy */
if (len > 256) return (bigcopyin(udaddr, kaddr, len));
if (setfault(&env)) {
curpcb->pcb_onfault = 0;
return EFAULT;
}
if (!(ctx = pm->pm_ctx)) {
/* No context -- assign it one */
ctx_alloc(pm);
ctx = pm->pm_ctx;
}
asm volatile("addi %6,%6,1; mtctr %6;" /* Set up counter */
"mfmsr %0;" /* Save MSR */
"li %1,0x20; "
"andc %1,%0,%1; mtmsr %1;" /* Disable IMMU */
"mfpid %1;" /* Save old PID */
"sync; isync;"
"1: bdz 2f;" /* while len */
"mtpid %3; sync;" /* Load user ctx */
"lbz %2,0(%4); addi %4,%4,1;" /* Load byte */
"sync; isync;"
"mtpid %1;sync;"
"stb %2,0(%5); dcbf 0,%5; addi %5,%5,1;" /* Store kernel byte */
"sync; isync;"
"b 1b;" /* repeat */
"2: mtpid %1; mtmsr %0;" /* Restore PID and MSR */
"sync; isync;"
: "=&r" (msr), "=&r" (pid), "=&r" (tmp)
: "r" (ctx), "r" (udaddr), "r" (kaddr), "r" (len));
curpcb->pcb_onfault = 0;
return 0;
}
static int
bigcopyin(const void *udaddr, void *kaddr, size_t len)
{
const char *up;
char *kp = kaddr;
struct lwp *l = curlwp;
struct proc *p;
int error;
if (!l) {
return EFAULT;
}
p = l->l_proc;
/*
* Stolen from physio():
*/
PHOLD(l);
error = uvm_vslock(p, (caddr_t)udaddr, len, VM_PROT_READ);
if (error) {
PRELE(l);
return EFAULT;
}
up = (char *)vmaprange(p, (vaddr_t)udaddr, len, VM_PROT_READ);
memcpy(kp, up, len);
vunmaprange((vaddr_t)up, len);
uvm_vsunlock(p, (caddr_t)udaddr, len);
PRELE(l);
return 0;
}
int
copyout(const void *kaddr, void *udaddr, size_t len)
{
struct pmap *pm = curproc->p_vmspace->vm_map.pmap;
int msr, pid, tmp, ctx;
struct faultbuf env;
/* For big copies use more efficient routine */
if (len > 256) return (bigcopyout(kaddr, udaddr, len));
if (setfault(&env)) {
curpcb->pcb_onfault = 0;
return EFAULT;
}
if (!(ctx = pm->pm_ctx)) {
/* No context -- assign it one */
ctx_alloc(pm);
ctx = pm->pm_ctx;
}
asm volatile("addi %6,%6,1; mtctr %6;" /* Set up counter */
"mfmsr %0;" /* Save MSR */
"li %1,0x20; "
"andc %1,%0,%1; mtmsr %1;" /* Disable IMMU */
"mfpid %1;" /* Save old PID */
"sync; isync;"
"1: bdz 2f;" /* while len */
"mtpid %1;sync;"
"lbz %2,0(%5); addi %5,%5,1;" /* Load kernel byte */
"sync; isync;"
"mtpid %3; sync;" /* Load user ctx */
"stb %2,0(%4); dcbf 0,%4; addi %4,%4,1;" /* Store user byte */
"sync; isync;"
"b 1b;" /* repeat */
"2: mtpid %1; mtmsr %0;" /* Restore PID and MSR */
"sync; isync;"
: "=&r" (msr), "=&r" (pid), "=&r" (tmp)
: "r" (ctx), "r" (udaddr), "r" (kaddr), "r" (len));
curpcb->pcb_onfault = 0;
return 0;
}
static int
bigcopyout(const void *kaddr, void *udaddr, size_t len)
{
char *up;
const char *kp = (char *)kaddr;
struct lwp *l = curlwp;
struct proc *p;
int error;
if (!l) {
return EFAULT;
}
p = l->l_proc;
/*
* Stolen from physio():
*/
PHOLD(l);
error = uvm_vslock(p, udaddr, len, VM_PROT_WRITE);
if (error) {
PRELE(l);
return EFAULT;
}
up = (char *)vmaprange(p, (vaddr_t)udaddr, len,
VM_PROT_READ | VM_PROT_WRITE);
memcpy(up, kp, len);
vunmaprange((vaddr_t)up, len);
uvm_vsunlock(p, udaddr, len);
PRELE(l);
return 0;
}
/*
* kcopy(const void *src, void *dst, size_t len);
*
* Copy len bytes from src to dst, aborting if we encounter a fatal
* page fault.
*
* kcopy() _must_ save and restore the old fault handler since it is
* called by uiomove(), which may be in the path of servicing a non-fatal
* page fault.
*/
int
kcopy(const void *src, void *dst, size_t len)
{
struct faultbuf env, *oldfault;
oldfault = curpcb->pcb_onfault;
if (setfault(&env)) {
curpcb->pcb_onfault = oldfault;
return EFAULT;
}
memcpy(dst, src, len);
curpcb->pcb_onfault = oldfault;
return 0;
}
int
badaddr(void *addr, size_t size)
{
return badaddr_read(addr, size, NULL);
}
int
badaddr_read(void *addr, size_t size, int *rptr)
{
struct faultbuf env;
int x;
/* Get rid of any stale machine checks that have been waiting. */
__asm __volatile ("sync; isync");
if (setfault(&env)) {
curpcb->pcb_onfault = 0;
__asm __volatile ("sync");
return 1;
}
__asm __volatile ("sync");
switch (size) {
case 1:
x = *(volatile int8_t *)addr;
break;
case 2:
x = *(volatile int16_t *)addr;
break;
case 4:
x = *(volatile int32_t *)addr;
break;
default:
panic("badaddr: invalid size (%d)", size);
}
/* Make sure we took the machine check, if we caused one. */
__asm __volatile ("sync; isync");
curpcb->pcb_onfault = 0;
__asm __volatile ("sync"); /* To be sure. */
/* Use the value to avoid reorder. */
if (rptr)
*rptr = x;
return 0;
}
/*
* For now, this only deals with the particular unaligned access case
* that gcc tends to generate. Eventually it should handle all of the
* possibilities that can happen on a 32-bit PowerPC in big-endian mode.
*/
static int
fix_unaligned(struct lwp *l, struct trapframe *frame)
{
return -1;
}
/*
* Start a new LWP
*/
void
startlwp(arg)
void *arg;
{
int err;
ucontext_t *uc = arg;
struct lwp *l = curlwp;
err = cpu_setmcontext(l, &uc->uc_mcontext, uc->uc_flags);
#if DIAGNOSTIC
if (err) {
printf("Error %d from cpu_setmcontext.", err);
}
#endif
pool_put(&lwp_uc_pool, uc);
upcallret(l);
}
/*
* XXX This is a terrible name.
*/
void
upcallret(l)
struct lwp *l;
{
/* Invoke MI userret code */
mi_userret(l);
curcpu()->ci_schedstate.spc_curpriority = l->l_priority = l->l_usrpri;
}
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