mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-17 10:26:15 +00:00
688ebe120c
the process of exiting the kernel. The ast() function now loops as long as the PS_ASTPENDING or PS_NEEDRESCHED flags are set. It returns with preemption disabled so that any further AST's that arrive via an interrupt will be delayed until the low-level MD code returns to user mode. - Use u_int's to store the tick counts for profiling purposes so that we do not need sched_lock just to read p_sticks. This also closes a problem where the call to addupc_task() could screw up the arithmetic due to non-atomic reads of p_sticks. - Axe need_proftick(), aston(), astoff(), astpending(), need_resched(), clear_resched(), and resched_wanted() in favor of direct bit operations on p_sflag. - Fix up locking with sched_lock some. In addupc_intr(), use sched_lock to ensure pr_addr and pr_ticks are updated atomically with setting PS_OWEUPC. In ast() we clear pr_ticks atomically with clearing PS_OWEUPC. We also do not grab the lock just to test a flag. - Simplify the handling of Giant in ast() slightly. Reviewed by: bde (mostly)
600 lines
13 KiB
C
600 lines
13 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* $NetBSD: trap.c,v 1.26 2000/05/27 00:40:40 sommerfeld Exp $
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char rcsid[] =
|
|
"$FreeBSD$";
|
|
#endif /* not lint */
|
|
|
|
#include "opt_ddb.h"
|
|
#include "opt_ktrace.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/reboot.h>
|
|
#include <sys/syscall.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/uio.h>
|
|
#include <sys/user.h>
|
|
#include <sys/ktrace.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_kern.h>
|
|
#include <vm/pmap.h>
|
|
|
|
#include <machine/cpu.h>
|
|
#include <machine/frame.h>
|
|
#include <machine/pcb.h>
|
|
#include <machine/psl.h>
|
|
#include <machine/trap.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 */
|
|
|
|
volatile int astpending;
|
|
volatile int want_resched;
|
|
|
|
#if 0 /* XXX: not used yet */
|
|
static int fix_unaligned __P((struct proc *p, struct trapframe *frame));
|
|
#endif
|
|
|
|
void
|
|
trap(struct trapframe *frame)
|
|
{
|
|
#if 0 /* XXX: This code hasn't been reworked yet. */
|
|
struct proc *p;
|
|
int type;
|
|
u_int sticks;
|
|
|
|
p = curproc;
|
|
type = frame->exc;
|
|
|
|
if (frame->srr1 & PSL_PR) {
|
|
type |= EXC_USER;
|
|
sticks = p->p_sticks;
|
|
}
|
|
|
|
switch (type) {
|
|
case EXC_TRC|EXC_USER:
|
|
frame->srr1 &= ~PSL_SE;
|
|
trapsignal(p, SIGTRAP, EXC_TRC);
|
|
break;
|
|
case EXC_DSI:
|
|
{
|
|
vm_map_t map;
|
|
vaddr_t va;
|
|
int ftype;
|
|
faultbuf *fb;
|
|
|
|
map = kernel_map;
|
|
va = frame->dar;
|
|
if ((va >> ADDR_SR_SHFT) == USER_SR) {
|
|
sr_t user_sr;
|
|
|
|
__asm ("mfsr %0, %1"
|
|
: "=r"(user_sr) : "K"(USER_SR));
|
|
va &= ADDR_PIDX | ADDR_POFF;
|
|
va |= user_sr << ADDR_SR_SHFT;
|
|
map = &p->p_vmspace->vm_map;
|
|
}
|
|
if (frame->dsisr & DSISR_STORE)
|
|
ftype = VM_PROT_READ | VM_PROT_WRITE;
|
|
else
|
|
ftype = VM_PROT_READ;
|
|
if (uvm_fault(map, trunc_page(va), 0, ftype)
|
|
== KERN_SUCCESS)
|
|
return;
|
|
if (fb = p->p_addr->u_pcb.pcb_onfault) {
|
|
frame->srr0 = (*fb)[0];
|
|
frame->fixreg[1] = (*fb)[1];
|
|
frame->fixreg[2] = (*fb)[2];
|
|
frame->cr = (*fb)[3];
|
|
bcopy(&(*fb)[4], &frame->fixreg[13],
|
|
19 * sizeof(register_t));
|
|
return;
|
|
}
|
|
map = kernel_map;
|
|
}
|
|
goto brain_damage;
|
|
case EXC_DSI|EXC_USER:
|
|
{
|
|
int ftype, rv;
|
|
|
|
if (frame->dsisr & DSISR_STORE)
|
|
ftype = VM_PROT_READ | VM_PROT_WRITE;
|
|
else
|
|
ftype = VM_PROT_READ;
|
|
if ((rv = uvm_fault(&p->p_vmspace->vm_map,
|
|
trunc_page(frame->dar), 0, ftype))
|
|
== KERN_SUCCESS)
|
|
break;
|
|
if (rv == KERN_RESOURCE_SHORTAGE) {
|
|
printf("UVM: pid %d (%s), uid %d killed: "
|
|
"out of swap\n",
|
|
p->p_pid, p->p_comm,
|
|
p->p_cred && p->p_ucred ?
|
|
p->p_ucred->cr_uid : -1);
|
|
trapsignal(p, SIGKILL, EXC_DSI);
|
|
} else {
|
|
trapsignal(p, SIGSEGV, EXC_DSI);
|
|
}
|
|
}
|
|
break;
|
|
case EXC_ISI|EXC_USER:
|
|
{
|
|
int ftype;
|
|
|
|
ftype = VM_PROT_READ | VM_PROT_EXECUTE;
|
|
if (uvm_fault(&p->p_vmspace->vm_map,
|
|
trunc_page(frame->srr0), 0, ftype)
|
|
== KERN_SUCCESS)
|
|
break;
|
|
}
|
|
trapsignal(p, SIGSEGV, EXC_ISI);
|
|
break;
|
|
case EXC_SC|EXC_USER:
|
|
{
|
|
struct sysent *callp;
|
|
size_t argsize;
|
|
register_t code, error;
|
|
register_t *params, rval[2];
|
|
int nsys, n;
|
|
register_t args[10];
|
|
|
|
uvmexp.syscalls++;
|
|
|
|
nsys = p->p_emul->e_nsysent;
|
|
callp = p->p_emul->e_sysent;
|
|
|
|
code = frame->fixreg[0];
|
|
params = frame->fixreg + FIRSTARG;
|
|
|
|
switch (code) {
|
|
case SYS_syscall:
|
|
/*
|
|
* code is first argument,
|
|
* followed by actual args.
|
|
*/
|
|
code = *params++;
|
|
break;
|
|
case SYS___syscall:
|
|
/*
|
|
* Like syscall, but code is a quad,
|
|
* so as to maintain quad alignment
|
|
* for the rest of the args.
|
|
*/
|
|
if (callp != sysent)
|
|
break;
|
|
params++;
|
|
code = *params++;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
if (code < 0 || code >= nsys)
|
|
callp += p->p_emul->e_nosys;
|
|
else
|
|
callp += code;
|
|
argsize = callp->sy_argsize;
|
|
n = NARGREG - (params - (frame->fixreg + FIRSTARG));
|
|
if (argsize > n * sizeof(register_t)) {
|
|
bcopy(params, args, n * sizeof(register_t));
|
|
if (error = copyin(MOREARGS(frame->fixreg[1]),
|
|
args + n,
|
|
argsize - n * sizeof(register_t))) {
|
|
#ifdef KTRACE
|
|
/* Can't get all the arguments! */
|
|
if (KTRPOINT(p, KTR_SYSCALL))
|
|
ktrsyscall(p, code, argsize,
|
|
args);
|
|
#endif
|
|
goto syscall_bad;
|
|
}
|
|
params = args;
|
|
}
|
|
#ifdef KTRACE
|
|
if (KTRPOINT(p, KTR_SYSCALL))
|
|
ktrsyscall(p, code, argsize, params);
|
|
#endif
|
|
rval[0] = 0;
|
|
rval[1] = frame->fixreg[FIRSTARG + 1];
|
|
|
|
switch (error = (*callp->sy_call)(p, params, rval)) {
|
|
case 0:
|
|
frame->fixreg[FIRSTARG] = rval[0];
|
|
frame->fixreg[FIRSTARG + 1] = rval[1];
|
|
frame->cr &= ~0x10000000;
|
|
break;
|
|
case ERESTART:
|
|
/*
|
|
* Set user's pc back to redo the system call.
|
|
*/
|
|
frame->srr0 -= 4;
|
|
break;
|
|
case EJUSTRETURN:
|
|
/* nothing to do */
|
|
break;
|
|
default:
|
|
syscall_bad:
|
|
if (p->p_emul->e_errno)
|
|
error = p->p_emul->e_errno[error];
|
|
frame->fixreg[FIRSTARG] = error;
|
|
frame->cr |= 0x10000000;
|
|
break;
|
|
}
|
|
#ifdef KTRACE
|
|
if (KTRPOINT(p, KTR_SYSRET))
|
|
ktrsysret(p, code, error, rval[0]);
|
|
#endif
|
|
}
|
|
break;
|
|
|
|
case EXC_FPU|EXC_USER:
|
|
if (fpuproc)
|
|
save_fpu(fpuproc);
|
|
fpuproc = p;
|
|
enable_fpu(p);
|
|
break;
|
|
|
|
case EXC_AST|EXC_USER:
|
|
/* This is just here that we trap */
|
|
break;
|
|
|
|
case EXC_ALI|EXC_USER:
|
|
if (fix_unaligned(p, frame) != 0)
|
|
trapsignal(p, SIGBUS, EXC_ALI);
|
|
else
|
|
frame->srr0 += 4;
|
|
break;
|
|
|
|
case EXC_PGM|EXC_USER:
|
|
/* XXX temporarily */
|
|
if (frame->srr1 & 0x0002000)
|
|
trapsignal(p, SIGTRAP, EXC_PGM);
|
|
else
|
|
trapsignal(p, SIGILL, EXC_PGM);
|
|
break;
|
|
|
|
case EXC_MCHK:
|
|
{
|
|
faultbuf *fb;
|
|
|
|
if (fb = p->p_addr->u_pcb.pcb_onfault) {
|
|
frame->srr0 = (*fb)[0];
|
|
frame->fixreg[1] = (*fb)[1];
|
|
frame->fixreg[2] = (*fb)[2];
|
|
frame->cr = (*fb)[3];
|
|
bcopy(&(*fb)[4], &frame->fixreg[13],
|
|
19 * sizeof(register_t));
|
|
return;
|
|
}
|
|
}
|
|
goto brain_damage;
|
|
|
|
default:
|
|
brain_damage:
|
|
printf("trap type %x at %x\n", type, frame->srr0);
|
|
#ifdef DDB
|
|
Debugger(); /* XXX temporarily */
|
|
#endif
|
|
#ifdef TRAP_PANICWAIT
|
|
printf("Press a key to panic.\n");
|
|
cngetc();
|
|
#endif
|
|
panic("trap");
|
|
}
|
|
|
|
astpending = 0; /* we are about to do it */
|
|
|
|
uvmexp.softs++;
|
|
|
|
if (p->p_flag & P_OWEUPC) {
|
|
p->p_flag &= ~P_OWEUPC;
|
|
ADDUPROF(p);
|
|
}
|
|
|
|
/* take pending signals */
|
|
{
|
|
int sig;
|
|
|
|
while (sig = CURSIG(p))
|
|
postsig(sig);
|
|
}
|
|
|
|
p->p_priority = p->p_usrpri;
|
|
if (want_resched) {
|
|
int sig;
|
|
/*
|
|
* We are being preempted.
|
|
*/
|
|
preempt(NULL);
|
|
while (sig = CURSIG(p))
|
|
postsig(sig);
|
|
}
|
|
|
|
/*
|
|
* If profiling, charge recent system time to the trapped pc.
|
|
*/
|
|
if (p->p_flag & P_PROFIL) {
|
|
extern int psratio;
|
|
|
|
addupc_task(p, frame->srr0,
|
|
(int)(p->p_sticks - sticks) * psratio);
|
|
}
|
|
/*
|
|
* If someone stole the fpu while we were away, disable it
|
|
*/
|
|
if (p != fpuproc)
|
|
frame->srr1 &= ~PSL_FP;
|
|
curcpu()->ci_schedstate.spc_curpriority = p->p_priority;
|
|
#endif
|
|
}
|
|
|
|
#if 0 /* XXX: child_return not used */
|
|
void
|
|
child_return(void *arg)
|
|
{
|
|
struct proc *p;
|
|
struct trapframe *tf;
|
|
|
|
p = arg;
|
|
tf = trapframe(p);
|
|
|
|
tf->fixreg[FIRSTARG] = 0;
|
|
tf->fixreg[FIRSTARG + 1] = 1;
|
|
tf->cr &= ~0x10000000;
|
|
tf->srr1 &= ~PSL_FP; /* Disable FPU, as we can't be fpuproc */
|
|
#ifdef KTRACE
|
|
if (KTRPOINT(p, KTR_SYSRET))
|
|
ktrsysret(p, SYS_fork, 0, 0);
|
|
#endif
|
|
/* Profiling? XXX */
|
|
curcpu()->ci_schedstate.spc_curpriority = p->p_priority;
|
|
}
|
|
#endif
|
|
|
|
static __inline void
|
|
setusr(int content)
|
|
{
|
|
|
|
__asm __volatile ("isync; mtsr %0,%1; isync"
|
|
:: "n"(USER_SR), "r"(content));
|
|
}
|
|
|
|
int
|
|
copyin(udaddr, kaddr, len)
|
|
const void *udaddr;
|
|
void *kaddr;
|
|
size_t len;
|
|
{
|
|
const char *up;
|
|
char *kp;
|
|
char *p;
|
|
size_t l;
|
|
faultbuf env;
|
|
|
|
up = udaddr;
|
|
kp = kaddr;
|
|
|
|
#if 0
|
|
if (setfault(env)) {
|
|
curpcb->pcb_onfault = 0;
|
|
return EFAULT;
|
|
}
|
|
#endif
|
|
while (len > 0) {
|
|
p = (char *)USER_ADDR + ((u_int)up & ~SEGMENT_MASK);
|
|
l = ((char *)USER_ADDR + SEGMENT_LENGTH) - p;
|
|
if (l > len)
|
|
l = len;
|
|
setusr(curpcb->pcb_pm->pm_sr[(u_int)up >> ADDR_SR_SHFT]);
|
|
bcopy(p, kp, l);
|
|
up += l;
|
|
kp += l;
|
|
len -= l;
|
|
}
|
|
curpcb->pcb_onfault = 0;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
copyout(kaddr, udaddr, len)
|
|
const void *kaddr;
|
|
void *udaddr;
|
|
size_t len;
|
|
{
|
|
const char *kp;
|
|
char *up;
|
|
char *p;
|
|
size_t l;
|
|
faultbuf env;
|
|
|
|
kp = kaddr;
|
|
up = udaddr;
|
|
|
|
#if 0
|
|
if (setfault(env)) {
|
|
curpcb->pcb_onfault = 0;
|
|
return EFAULT;
|
|
}
|
|
#endif
|
|
while (len > 0) {
|
|
p = (char *)USER_ADDR + ((u_int)up & ~SEGMENT_MASK);
|
|
l = ((char *)USER_ADDR + SEGMENT_LENGTH) - p;
|
|
if (l > len)
|
|
l = len;
|
|
setusr(curpcb->pcb_pm->pm_sr[(u_int)up >> ADDR_SR_SHFT]);
|
|
bcopy(kp, p, l);
|
|
up += l;
|
|
kp += l;
|
|
len -= l;
|
|
}
|
|
curpcb->pcb_onfault = 0;
|
|
return 0;
|
|
}
|
|
|
|
#if 0 /* XXX: not used yet */
|
|
/*
|
|
* 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)
|
|
{
|
|
faultbuf env, *oldfault;
|
|
|
|
oldfault = curpcb->pcb_onfault;
|
|
if (setfault(env)) {
|
|
curpcb->pcb_onfault = oldfault;
|
|
return EFAULT;
|
|
}
|
|
|
|
bcopy(src, dst, 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)
|
|
{
|
|
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;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
#if 0 /* XXX: Not used yet */
|
|
static int
|
|
fix_unaligned(p, frame)
|
|
struct proc *p;
|
|
struct trapframe *frame;
|
|
{
|
|
int indicator;
|
|
|
|
indicator = EXC_ALI_OPCODE_INDICATOR(frame->dsisr);
|
|
|
|
switch (indicator) {
|
|
case EXC_ALI_LFD:
|
|
case EXC_ALI_STFD:
|
|
{
|
|
int reg = EXC_ALI_RST(frame->dsisr);
|
|
double *fpr = &p->p_addr->u_pcb.pcb_fpu.fpr[reg];
|
|
|
|
/* Juggle the FPU to ensure that we've initialized
|
|
* the FPRs, and that their current state is in
|
|
* the PCB.
|
|
*/
|
|
if (fpuproc != p) {
|
|
if (fpuproc)
|
|
save_fpu(fpuproc);
|
|
enable_fpu(p);
|
|
}
|
|
save_fpu(p);
|
|
|
|
if (indicator == EXC_ALI_LFD) {
|
|
if (copyin((void *)frame->dar, fpr,
|
|
sizeof(double)) != 0)
|
|
return -1;
|
|
enable_fpu(p);
|
|
} else {
|
|
if (copyout(fpr, (void *)frame->dar,
|
|
sizeof(double)) != 0)
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
#endif
|