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freebsd-nq/sys/kern/subr_trap.c
Rodney W. Grimes 960173b9b2 genassym.c: 
Remove NKMEMCLUSTERS, it is no longer define or used.

locores.s:
	Fix comment on PTDpde and APTDpde to be pde instead of pte
	Add new equation for calculating location of Sysmap
	Remove Bill's old #ifdef garbage for counting up memory,
	that stuff will never be made to work and was just cluttering
	up the file.

	Add code that places the PTD, page table pages, and kernel
	stack below the 640k ISA hole if there is room for it, otherwise
	put this stuff all at 1MB.  This fixes the 28K bogusity in
	the boot blocks, that can now go away!

	Fix the caclulation of where first is to be dependent on
	NKPDE so that we can skip over the above mentioned areas.
	The 28K thing is now 44K in size due to the increase in
	kernel virtual memory space, but since we no longer have
	to worry about that this is no big deal.

	Use if NNPX > 0 instead of ifdef NPX for floating point code.

machdep.c
	Change the calculation of for the buffer cache to be
	20% of all memory above 2MB and add back the upper limit
	of 2/5's of the VM_KMEM_SIZE so that we do not eat ALL
	of the kernel memory space on large memory machines, note
	that this will not even come into effect unless you have
	more than 32MB.  The current buffer cache limit is 6.7MB
	due to this caclulation.

	It seems that we where erroniously allocating bufpages pages
	for buffer_map.  buffer_map is UNUSED in this implementation
	of the buffer cache, but since the map is referenced in
	several if statements a quick fix was to simply allocate
	1 vm page (but no real memory) to it.

pmap.h
	Remove rcsid, don't want them in the kernel files!

	Removed some cruft inside an #ifdef DEBUGx that caused
	compiler errors if you where compiling this for debug.

	Use the #defines for PD_SHIFT and PG_SHIFT in place of
	constants.

trap.c:
	Remove patch kit header and rcsid, fix $Id$.
	Now include "npx.h" and use NNPX for controlling the
	floating point code.

	Remove a now completly invalid check for a maximum virtual
	address, the virtual address now ends at 0xFFFFFFFF so
	there is no more MAX!!  (Thanks David, I completly missed
	that one!)

vm_machdep.c
	Remove patch kit header and rcsid, fix $Id$.
	Now include "npx.h" and use NNPX for controlling the
	floating point code.

	Replace several 0xFE00000 constants with KERNBASE
1993-10-15 10:34:29 +00:00

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/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the University of Utah, and William Jolitz.
*
* 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 the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS 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.
*
* from: @(#)trap.c 7.4 (Berkeley) 5/13/91
* $Id$
*/
/*
* 386 Trap and System call handleing
*/
#include "npx.h"
#include "machine/cpu.h"
#include "machine/psl.h"
#include "machine/reg.h"
#include "param.h"
#include "systm.h"
#include "proc.h"
#include "user.h"
#include "acct.h"
#include "kernel.h"
#ifdef KTRACE
#include "ktrace.h"
#endif
#include "vm/vm_param.h"
#include "vm/pmap.h"
#include "vm/vm_map.h"
#include "sys/vmmeter.h"
#include "machine/trap.h"
#ifdef __GNUC__
/*
* The "r" contraint could be "rm" except for fatal bugs in gas. As usual,
* we omit the size from the mov instruction to avoid nonfatal bugs in gas.
*/
#define read_gs() ({ u_short gs; __asm("mov %%gs,%0" : "=r" (gs)); gs; })
#define write_gs(gs) __asm("mov %0,%%gs" : : "r" ((u_short) gs))
#else /* not __GNUC__ */
u_short read_gs __P((void));
void write_gs __P((/* promoted u_short */ int gs));
#endif /* __GNUC__ */
struct sysent sysent[];
int nsysent;
int dostacklimits;
unsigned rcr2();
extern short cpl;
/*
* trap(frame):
* Exception, fault, and trap interface to BSD kernel. This
* common code is called from assembly language IDT gate entry
* routines that prepare a suitable stack frame, and restore this
* frame after the exception has been processed. Note that the
* effect is as if the arguments were passed call by reference.
*/
/*ARGSUSED*/
trap(frame)
struct trapframe frame;
{
register int i;
register struct proc *p = curproc;
struct timeval syst;
int ucode, type, code, eva;
frame.tf_eflags &= ~PSL_NT; /* clear nested trap XXX */
type = frame.tf_trapno;
#include "ddb.h"
#if NDDB > 0
if (curpcb && curpcb->pcb_onfault) {
if (frame.tf_trapno == T_BPTFLT
|| frame.tf_trapno == T_TRCTRAP)
if (kdb_trap (type, 0, &frame))
return;
}
#endif
/*pg("trap type %d code = %x eip = %x cs = %x eva = %x esp %x",
frame.tf_trapno, frame.tf_err, frame.tf_eip,
frame.tf_cs, rcr2(), frame.tf_esp);*/
if(curpcb == 0 || curproc == 0) goto we_re_toast;
if (curpcb->pcb_onfault && frame.tf_trapno != T_PAGEFLT) {
extern int _udatasel;
if (read_gs() != (u_short) _udatasel)
/*
* Some user has corrupted %gs but we depend on it in
* copyout() etc. Fix it up and retry.
*
* (We don't preserve %fs or %gs, so users can change
* them to either _ucodesel, _udatasel or a not-present
* selector, possibly ORed with 0 to 3, making them
* volatile for other users. Not preserving them saves
* time and doesn't lose functionality or open security
* holes.)
*/
write_gs(_udatasel);
else
copyfault:
frame.tf_eip = (int)curpcb->pcb_onfault;
return;
}
syst = p->p_stime;
if (ISPL(frame.tf_cs) == SEL_UPL) {
type |= T_USER;
p->p_regs = (int *)&frame;
curpcb->pcb_flags |= FM_TRAP; /* used by sendsig */
}
ucode=0;
eva = rcr2();
code = frame.tf_err;
switch (type) {
default:
we_re_toast:
#ifdef KDB
if (kdb_trap(&psl))
return;
#endif
#if NDDB > 0
if (kdb_trap (type, 0, &frame))
return;
#endif
printf("trap type %d code = %x eip = %x cs = %x eflags = %x ",
frame.tf_trapno, frame.tf_err, frame.tf_eip,
frame.tf_cs, frame.tf_eflags);
eva = rcr2();
printf("cr2 %x cpl %x\n", eva, cpl);
/* type &= ~T_USER; */ /* XXX what the hell is this */
panic("trap");
/*NOTREACHED*/
case T_SEGNPFLT|T_USER:
case T_STKFLT|T_USER:
case T_PROTFLT|T_USER: /* protection fault */
ucode = code + BUS_SEGM_FAULT ;
i = SIGBUS;
break;
case T_PRIVINFLT|T_USER: /* privileged instruction fault */
case T_RESADFLT|T_USER: /* reserved addressing fault */
case T_RESOPFLT|T_USER: /* reserved operand fault */
case T_FPOPFLT|T_USER: /* coprocessor operand fault */
ucode = type &~ T_USER;
i = SIGILL;
break;
case T_ASTFLT|T_USER: /* Allow process switch */
astoff();
cnt.v_soft++;
if ((p->p_flag & SOWEUPC) && p->p_stats->p_prof.pr_scale) {
addupc(frame.tf_eip, &p->p_stats->p_prof, 1);
p->p_flag &= ~SOWEUPC;
}
goto out;
case T_DNA|T_USER:
#if NNPX > 0
/* if a transparent fault (due to context switch "late") */
if (npxdna()) return;
#endif /* NNPX > 0 */
#ifdef MATH_EMULATE
i = math_emulate(&frame);
if (i == 0) return;
#else /* MATH_EMULTATE */
panic("trap: math emulation necessary!");
#endif /* MATH_EMULTATE */
ucode = FPE_FPU_NP_TRAP;
break;
case T_BOUND|T_USER:
ucode = FPE_SUBRNG_TRAP;
i = SIGFPE;
break;
case T_OFLOW|T_USER:
ucode = FPE_INTOVF_TRAP;
i = SIGFPE;
break;
case T_DIVIDE|T_USER:
ucode = FPE_INTDIV_TRAP;
i = SIGFPE;
break;
case T_ARITHTRAP|T_USER:
ucode = code;
i = SIGFPE;
break;
case T_PAGEFLT: /* allow page faults in kernel mode */
#if 0
/* XXX - check only applies to 386's and 486's with WP off */
if (code & PGEX_P) goto we_re_toast;
#endif
/* fall into */
case T_PAGEFLT|T_USER: /* page fault */
{
register vm_offset_t va;
register struct vmspace *vm = p->p_vmspace;
register vm_map_t map;
int rv;
vm_prot_t ftype;
extern vm_map_t kernel_map;
unsigned nss,v;
va = trunc_page((vm_offset_t)eva);
/*
* It is only a kernel address space fault iff:
* 1. (type & T_USER) == 0 and
* 2. pcb_onfault not set or
* 3. pcb_onfault set but supervisor space fault
* The last can occur during an exec() copyin where the
* argument space is lazy-allocated.
*/
if (type == T_PAGEFLT && va >= KERNBASE)
map = kernel_map;
else
map = &vm->vm_map;
if (code & PGEX_W)
ftype = VM_PROT_READ | VM_PROT_WRITE;
else
ftype = VM_PROT_READ;
#ifdef DEBUG
if (map == kernel_map && va == 0) {
printf("trap: bad kernel access at %x\n", va);
goto we_re_toast;
}
#endif
/*
* XXX: rude hack to make stack limits "work"
*/
nss = 0;
if ((caddr_t)va >= vm->vm_maxsaddr && map != kernel_map
&& dostacklimits) {
nss = clrnd(btoc((unsigned)vm->vm_maxsaddr
+ MAXSSIZ - (unsigned)va));
if (nss > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur)) {
/*pg("trap rlimit %d, maxsaddr %x va %x ", nss, vm->vm_maxsaddr, va);*/
rv = KERN_FAILURE;
goto nogo;
}
}
/* check if page table is mapped, if not, fault it first */
#define pde_v(v) (PTD[((v)>>PD_SHIFT)&1023].pd_v)
if (!pde_v(va)) {
v = trunc_page(vtopte(va));
rv = vm_fault(map, v, ftype, FALSE);
if (rv != KERN_SUCCESS) goto nogo;
/* check if page table fault, increment wiring */
vm_map_pageable(map, v, round_page(v+1), FALSE);
} else v=0;
rv = vm_fault(map, va, ftype, FALSE);
if (rv == KERN_SUCCESS) {
/*
* XXX: continuation of rude stack hack
*/
if (nss > vm->vm_ssize)
vm->vm_ssize = nss;
va = trunc_page(vtopte(va));
/* for page table, increment wiring
as long as not a page table fault as well */
if (!v && type != T_PAGEFLT)
vm_map_pageable(map, va, round_page(va+1), FALSE);
if (type == T_PAGEFLT)
return;
goto out;
}
nogo:
if (type == T_PAGEFLT) {
if (curpcb->pcb_onfault)
goto copyfault;
printf("vm_fault(%x, %x, %x, 0) -> %x\n",
map, va, ftype, rv);
printf(" type %x, code %x\n",
type, code);
goto we_re_toast;
}
i = (rv == KERN_PROTECTION_FAILURE) ? SIGBUS : SIGSEGV;
break;
}
#if NDDB == 0
case T_TRCTRAP: /* trace trap -- someone single stepping lcall's */
frame.tf_eflags &= ~PSL_T;
/* Q: how do we turn it on again? */
return;
#endif
case T_BPTFLT|T_USER: /* bpt instruction fault */
case T_TRCTRAP|T_USER: /* trace trap */
frame.tf_eflags &= ~PSL_T;
i = SIGTRAP;
break;
#include "isa.h"
#if NISA > 0
case T_NMI:
case T_NMI|T_USER:
#if NDDB > 0
/* NMI can be hooked up to a pushbutton for debugging */
printf ("NMI ... going to debugger\n");
if (kdb_trap (type, 0, &frame))
return;
#endif
/* machine/parity/power fail/"kitchen sink" faults */
if(isa_nmi(code) == 0) return;
else goto we_re_toast;
#endif
}
trapsignal(p, i, ucode);
if ((type & T_USER) == 0)
return;
out:
while (i = CURSIG(p))
psig(i);
p->p_pri = p->p_usrpri;
if (want_resched) {
/*
* Since we are curproc, clock will normally just change
* our priority without moving us from one queue to another
* (since the running process is not on a queue.)
* If that happened after we setrq ourselves but before we
* swtch()'ed, we might not be on the queue indicated by
* our priority.
*/
(void) splclock();
setrq(p);
p->p_stats->p_ru.ru_nivcsw++;
swtch();
(void) splnone();
while (i = CURSIG(p))
psig(i);
}
if (p->p_stats->p_prof.pr_scale) {
int ticks;
struct timeval *tv = &p->p_stime;
ticks = ((tv->tv_sec - syst.tv_sec) * 1000 +
(tv->tv_usec - syst.tv_usec) / 1000) / (tick / 1000);
if (ticks) {
#ifdef PROFTIMER
extern int profscale;
addupc(frame.tf_eip, &p->p_stats->p_prof,
ticks * profscale);
#else
addupc(frame.tf_eip, &p->p_stats->p_prof, ticks);
#endif
}
}
curpri = p->p_pri;
curpcb->pcb_flags &= ~FM_TRAP; /* used by sendsig */
}
/*
* Compensate for 386 brain damage (missing URKR).
* This is a little simpler than the pagefault handler in trap() because
* it the page tables have already been faulted in and high addresses
* are thrown out early for other reasons.
*/
int trapwrite(addr)
unsigned addr;
{
unsigned nss;
struct proc *p;
vm_offset_t va;
struct vmspace *vm;
va = trunc_page((vm_offset_t)addr);
/*
* XXX - MAX is END. Changed > to >= for temp. fix.
*/
if (va >= VM_MAXUSER_ADDRESS)
return (1);
/*
* XXX: rude stack hack adapted from trap().
*/
nss = 0;
p = curproc;
vm = p->p_vmspace;
if ((caddr_t)va >= vm->vm_maxsaddr && dostacklimits) {
nss = clrnd(btoc((unsigned)vm->vm_maxsaddr + MAXSSIZ
- (unsigned)va));
if (nss > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur))
return (1);
}
if (vm_fault(&vm->vm_map, va, VM_PROT_READ | VM_PROT_WRITE, FALSE)
!= KERN_SUCCESS)
return (1);
/*
* XXX: continuation of rude stack hack
*/
if (nss > vm->vm_ssize)
vm->vm_ssize = nss;
return (0);
}
/*
* syscall(frame):
* System call request from POSIX system call gate interface to kernel.
* Like trap(), argument is call by reference.
*/
/*ARGSUSED*/
syscall(frame)
volatile struct syscframe frame;
{
register int *locr0 = ((int *)&frame);
register caddr_t params;
register int i;
register struct sysent *callp;
register struct proc *p = curproc;
struct timeval syst;
int error, opc;
int args[8], rval[2];
int code;
#ifdef lint
r0 = 0; r0 = r0; r1 = 0; r1 = r1;
#endif
syst = p->p_stime;
if (ISPL(frame.sf_cs) != SEL_UPL)
panic("syscall");
code = frame.sf_eax;
curpcb->pcb_flags &= ~FM_TRAP; /* used by sendsig */
p->p_regs = (int *)&frame;
params = (caddr_t)frame.sf_esp + sizeof (int) ;
/*
* Reconstruct pc, assuming lcall $X,y is 7 bytes, as it is always.
*/
opc = frame.sf_eip - 7;
callp = (code >= nsysent) ? &sysent[63] : &sysent[code];
if (callp == sysent) {
i = fuword(params);
params += sizeof (int);
callp = (code >= nsysent) ? &sysent[63] : &sysent[code];
}
if ((i = callp->sy_narg * sizeof (int)) &&
(error = copyin(params, (caddr_t)args, (u_int)i))) {
frame.sf_eax = error;
frame.sf_eflags |= PSL_C; /* carry bit */
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSCALL))
ktrsyscall(p->p_tracep, code, callp->sy_narg, &args);
#endif
goto done;
}
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSCALL))
ktrsyscall(p->p_tracep, code, callp->sy_narg, &args);
#endif
rval[0] = 0;
rval[1] = frame.sf_edx;
/*pg("%d. s %d\n", p->p_pid, code);*/
error = (*callp->sy_call)(p, args, rval);
if (error == ERESTART)
frame.sf_eip = opc;
else if (error != EJUSTRETURN) {
if (error) {
/*pg("error %d", error);*/
frame.sf_eax = error;
frame.sf_eflags |= PSL_C; /* carry bit */
} else {
frame.sf_eax = rval[0];
frame.sf_edx = rval[1];
frame.sf_eflags &= ~PSL_C; /* carry bit */
}
}
/* else if (error == EJUSTRETURN) */
/* nothing to do */
done:
/*
* Reinitialize proc pointer `p' as it may be different
* if this is a child returning from fork syscall.
*/
p = curproc;
while (i = CURSIG(p))
psig(i);
p->p_pri = p->p_usrpri;
if (want_resched) {
/*
* Since we are curproc, clock will normally just change
* our priority without moving us from one queue to another
* (since the running process is not on a queue.)
* If that happened after we setrq ourselves but before we
* swtch()'ed, we might not be on the queue indicated by
* our priority.
*/
(void) splclock();
setrq(p);
p->p_stats->p_ru.ru_nivcsw++;
swtch();
(void) splnone();
while (i = CURSIG(p))
psig(i);
}
if (p->p_stats->p_prof.pr_scale) {
int ticks;
struct timeval *tv = &p->p_stime;
ticks = ((tv->tv_sec - syst.tv_sec) * 1000 +
(tv->tv_usec - syst.tv_usec) / 1000) / (tick / 1000);
if (ticks) {
#ifdef PROFTIMER
extern int profscale;
addupc(frame.sf_eip, &p->p_stats->p_prof,
ticks * profscale);
#else
addupc(frame.sf_eip, &p->p_stats->p_prof, ticks);
#endif
}
}
curpri = p->p_pri;
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSRET))
ktrsysret(p->p_tracep, code, error, rval[0]);
#endif
#ifdef DIAGNOSTICx
{ extern int _udatasel, _ucodesel;
if (frame.sf_ss != _udatasel)
printf("ss %x call %d\n", frame.sf_ss, code);
if ((frame.sf_cs&0xffff) != _ucodesel)
printf("cs %x call %d\n", frame.sf_cs, code);
if (frame.sf_eip > VM_MAXUSER_ADDRESS) {
printf("eip %x call %d\n", frame.sf_eip, code);
frame.sf_eip = 0;
}
}
#endif
}
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