2 * Copyright (c) 1993 The Regents of the University of California.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <machine/asmacros.h>
35 #include <machine/cputypes.h>
36 #include <machine/intr_machdep.h>
37 #include <machine/pmap.h>
38 #include <machine/specialreg.h>
46 .globl intrcnt, eintrcnt
48 .space INTRCNT_COUNT * 4
51 .globl intrnames, eintrnames
53 .space INTRCNT_COUNT * (MAXCOMLEN + 1)
60 * void bzero(void *buf, u_int len)
146 /* fillw(pat, base, cnt) */
167 cmpl %ecx,%eax /* overlapping && src < dst? */
169 cld /* nope, copy forwards */
178 addl %ecx,%edi /* copy backwards. */
192 * bcopy(src, dst, cnt)
193 * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
206 cmpl %ecx,%eax /* overlapping && src < dst? */
209 shrl $2,%ecx /* copy by 32-bit words */
210 cld /* nope, copy forwards */
214 andl $3,%ecx /* any bytes left? */
224 addl %ecx,%edi /* copy backwards */
228 andl $3,%ecx /* any fractional bytes? */
232 movl 16(%ebp),%ecx /* copy remainder by 32-bit words */
246 * Note: memcpy does not support overlapping copies
255 shrl $2,%ecx /* copy by 32-bit words */
256 cld /* nope, copy forwards */
260 andl $3,%ecx /* any bytes left? */
268 /*****************************************************************************/
269 /* copyout and fubyte family */
270 /*****************************************************************************/
272 * Access user memory from inside the kernel. These routines and possibly
273 * the math- and DOS emulators should be the only places that do this.
275 * We have to access the memory with user's permissions, so use a segment
276 * selector with RPL 3. For writes to user space we have to additionally
277 * check the PTE for write permission, because the 386 does not check
278 * write permissions when we are executing with EPL 0. The 486 does check
279 * this if the WP bit is set in CR0, so we can use a simpler version here.
281 * These routines set curpcb->pcb_onfault for the time they execute. When a
282 * protection violation occurs inside the functions, the trap handler
283 * returns to *curpcb->pcb_onfault instead of the function.
287 * copyout(from_kernel, to_user, len) - MP SAFE
290 movl PCPU(CURPCB),%eax
291 movl $copyout_fault,PCB_ONFAULT(%eax)
298 testl %ebx,%ebx /* anything to do? */
302 * Check explicitly for non-user addresses. If 486 write protection
303 * is being used, this check is essential because we are in kernel
304 * mode so the h/w does not provide any protection against writing
309 * First, prevent address wrapping.
315 * XXX STOP USING VM_MAXUSER_ADDRESS.
316 * It is an end address, not a max, so every time it is used correctly it
317 * looks like there is an off by one error, and of course it caused an off
318 * by one error in several places.
320 cmpl $VM_MAXUSER_ADDRESS,%eax
323 /* bcopy(%esi, %edi, %ebx) */
340 movl PCPU(CURPCB),%edx
341 movl %eax,PCB_ONFAULT(%edx)
350 movl PCPU(CURPCB),%edx
351 movl $0,PCB_ONFAULT(%edx)
356 * copyin(from_user, to_kernel, len) - MP SAFE
359 movl PCPU(CURPCB),%eax
360 movl $copyin_fault,PCB_ONFAULT(%eax)
363 movl 12(%esp),%esi /* caddr_t from */
364 movl 16(%esp),%edi /* caddr_t to */
365 movl 20(%esp),%ecx /* size_t len */
368 * make sure address is valid
373 cmpl $VM_MAXUSER_ADDRESS,%edx
377 shrl $2,%ecx /* copy longword-wise */
382 andb $3,%cl /* copy remaining bytes */
389 movl PCPU(CURPCB),%edx
390 movl %eax,PCB_ONFAULT(%edx)
398 movl PCPU(CURPCB),%edx
399 movl $0,PCB_ONFAULT(%edx)
404 * casuword. Compare and set user word. Returns -1 or the current value.
409 movl PCPU(CURPCB),%ecx
410 movl $fusufault,PCB_ONFAULT(%ecx)
411 movl 4(%esp),%edx /* dst */
412 movl 8(%esp),%eax /* old */
413 movl 12(%esp),%ecx /* new */
415 cmpl $VM_MAXUSER_ADDRESS-4,%edx /* verify address is valid */
421 cmpxchgl %ecx,(%edx) /* Compare and set. */
424 * The old value is in %eax. If the store succeeded it will be the
425 * value we expected (old) from before the store, otherwise it will
426 * be the current value.
429 movl PCPU(CURPCB),%ecx
430 movl $fusufault,PCB_ONFAULT(%ecx)
431 movl $0,PCB_ONFAULT(%ecx)
437 * Fetch (load) a 32-bit word, a 16-bit word, or an 8-bit byte from user
438 * memory. All these functions are MPSAFE.
443 movl PCPU(CURPCB),%ecx
444 movl $fusufault,PCB_ONFAULT(%ecx)
445 movl 4(%esp),%edx /* from */
447 cmpl $VM_MAXUSER_ADDRESS-4,%edx /* verify address is valid */
451 movl $0,PCB_ONFAULT(%ecx)
457 * fuswintr() and suswintr() are specialized variants of fuword16() and
458 * suword16(), respectively. They are called from the profiling code,
459 * potentially at interrupt time. If they fail, that's okay; good things
460 * will happen later. They always fail for now, until the trap code is
461 * able to deal with this.
471 movl PCPU(CURPCB),%ecx
472 movl $fusufault,PCB_ONFAULT(%ecx)
475 cmpl $VM_MAXUSER_ADDRESS-2,%edx
479 movl $0,PCB_ONFAULT(%ecx)
484 movl PCPU(CURPCB),%ecx
485 movl $fusufault,PCB_ONFAULT(%ecx)
488 cmpl $VM_MAXUSER_ADDRESS-1,%edx
492 movl $0,PCB_ONFAULT(%ecx)
498 movl PCPU(CURPCB),%ecx
500 movl %eax,PCB_ONFAULT(%ecx)
505 * Store a 32-bit word, a 16-bit word, or an 8-bit byte to user memory.
506 * All these functions are MPSAFE.
511 movl PCPU(CURPCB),%ecx
512 movl $fusufault,PCB_ONFAULT(%ecx)
515 cmpl $VM_MAXUSER_ADDRESS-4,%edx /* verify address validity */
521 movl PCPU(CURPCB),%ecx
522 movl %eax,PCB_ONFAULT(%ecx)
528 movl PCPU(CURPCB),%ecx
529 movl $fusufault,PCB_ONFAULT(%ecx)
532 cmpl $VM_MAXUSER_ADDRESS-2,%edx /* verify address validity */
538 movl PCPU(CURPCB),%ecx /* restore trashed register */
539 movl %eax,PCB_ONFAULT(%ecx)
544 movl PCPU(CURPCB),%ecx
545 movl $fusufault,PCB_ONFAULT(%ecx)
548 cmpl $VM_MAXUSER_ADDRESS-1,%edx /* verify address validity */
554 movl PCPU(CURPCB),%ecx /* restore trashed register */
555 movl %eax,PCB_ONFAULT(%ecx)
560 * copyinstr(from, to, maxlen, int *lencopied) - MP SAFE
562 * copy a string from from to to, stop when a 0 character is reached.
563 * return ENAMETOOLONG if string is longer than maxlen, and
564 * EFAULT on protection violations. If lencopied is non-zero,
565 * return the actual length in *lencopied.
570 movl PCPU(CURPCB),%ecx
571 movl $cpystrflt,PCB_ONFAULT(%ecx)
573 movl 12(%esp),%esi /* %esi = from */
574 movl 16(%esp),%edi /* %edi = to */
575 movl 20(%esp),%edx /* %edx = maxlen */
577 movl $VM_MAXUSER_ADDRESS,%eax
579 /* make sure 'from' is within bounds */
583 /* restrict maxlen to <= VM_MAXUSER_ADDRESS-from */
601 /* Success -- 0 byte reached */
606 /* edx is zero - return ENAMETOOLONG or EFAULT */
607 cmpl $VM_MAXUSER_ADDRESS,%esi
610 movl $ENAMETOOLONG,%eax
617 /* set *lencopied and return %eax */
618 movl PCPU(CURPCB),%ecx
619 movl $0,PCB_ONFAULT(%ecx)
633 * copystr(from, to, maxlen, int *lencopied) - MP SAFE
639 movl 12(%esp),%esi /* %esi = from */
640 movl 16(%esp),%edi /* %edi = to */
641 movl 20(%esp),%edx /* %edx = maxlen */
652 /* Success -- 0 byte reached */
657 /* edx is zero -- return ENAMETOOLONG */
658 movl $ENAMETOOLONG,%eax
661 /* set *lencopied and return %eax */
683 cld /* compare forwards */
701 * Handling of special 386 registers and descriptor tables etc
703 /* void lgdt(struct region_descriptor *rdp); */
706 /* reload the descriptor table */
711 /* flush the prefetch q */
715 /* reload "stale" selectors */
724 /* reload code selector by turning return into intersegmental return */
732 /* ssdtosd(*ssdp,*sdp) */
754 /* void reset_dbregs() */
757 movl %eax,%dr7 /* disable all breapoints first */
766 /*****************************************************************************/
767 /* setjump, longjump */
768 /*****************************************************************************/
772 movl %ebx,(%eax) /* save ebx */
773 movl %esp,4(%eax) /* save esp */
774 movl %ebp,8(%eax) /* save ebp */
775 movl %esi,12(%eax) /* save esi */
776 movl %edi,16(%eax) /* save edi */
777 movl (%esp),%edx /* get rta */
778 movl %edx,20(%eax) /* save eip */
779 xorl %eax,%eax /* return(0); */
785 movl (%eax),%ebx /* restore ebx */
786 movl 4(%eax),%esp /* restore esp */
787 movl 8(%eax),%ebp /* restore ebp */
788 movl 12(%eax),%esi /* restore esi */
789 movl 16(%eax),%edi /* restore edi */
790 movl 20(%eax),%edx /* get rta */
791 movl %edx,(%esp) /* put in return frame */
792 xorl %eax,%eax /* return(1); */
798 * Support for BB-profiling (gcc -a). The kernbb program will extract
799 * the data from the kernel.
809 NON_GPROF_ENTRY(__bb_init_func)
818 * Support for reading MSRs in the safe manner.
821 /* int rdmsr_safe(u_int msr, uint64_t *data) */
822 movl PCPU(CURPCB),%ecx
823 movl $msr_onfault,PCB_ONFAULT(%ecx)
832 movl PCPU(CURPCB),%ecx
833 movl %eax,PCB_ONFAULT(%ecx)
838 * Support for writing MSRs in the safe manner.
841 /* int wrmsr_safe(u_int msr, uint64_t data) */
842 movl PCPU(CURPCB),%ecx
843 movl $msr_onfault,PCB_ONFAULT(%ecx)
851 movl PCPU(CURPCB),%ecx
852 movl %eax,PCB_ONFAULT(%ecx)
857 * MSR operations fault handler
861 movl PCPU(CURPCB),%ecx
862 movl $0,PCB_ONFAULT(%ecx)